JPH11147021A - Method and apparatus for controlling sludge reception into absorption tower for flue gas desulfurization equipment - Google Patents
Method and apparatus for controlling sludge reception into absorption tower for flue gas desulfurization equipmentInfo
- Publication number
- JPH11147021A JPH11147021A JP9315294A JP31529497A JPH11147021A JP H11147021 A JPH11147021 A JP H11147021A JP 9315294 A JP9315294 A JP 9315294A JP 31529497 A JP31529497 A JP 31529497A JP H11147021 A JPH11147021 A JP H11147021A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- absorption tower
- flow rate
- gypsum
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 123
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 90
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 29
- 230000023556 desulfurization Effects 0.000 title claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 15
- 239000003546 flue gas Substances 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 11
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 59
- 239000010440 gypsum Substances 0.000 claims abstract description 59
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 26
- 230000003009 desulfurizing effect Effects 0.000 claims description 8
- 239000011505 plaster Substances 0.000 claims description 6
- 239000006096 absorbing agent Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 12
- 230000002745 absorbent Effects 0.000 description 9
- 239000002250 absorbent Substances 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000002562 thickening agent Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Abstract
(57)【要約】
【課題】 目標石膏純度を維持できるだけの量の汚泥を
吸収塔内へ導入し、石膏に混ぜて回収することができ、
汚泥処理費用の削減を図り得るようにする。
【解決手段】 排水処理装置２４から排出される汚泥を
吸収塔３内へ導入するようにし、吸収塔３内へ導入され
る汚泥の流量を調節する汚泥流量調整弁２６と、吸収塔
３内へ実際に導入される実際汚泥受入流量Ｅを検出する
汚泥受入流量計２７と、脱硫ガス流量Ａを検出する脱硫
ガス流量計９と、吸収塔入口ＳＯ2濃度Ｂを検出する吸
収塔入口ＳＯ2濃度計１０と、脱硫ガス流量Ａと吸収塔
入口ＳＯ2濃度Ｂとに基づき吸収塔３内で生成される石
膏量Ｃを求め、石膏量Ｃに基づき目標石膏純度を維持で
きるだけの設定汚泥受入流量Ｄを求め、実際汚泥受入流
量Ｅが設定汚泥受入流量Ｄと等しくなるよう汚泥流量調
整弁２６へ開度指令Ｇを出力する制御器２８とを具備せ
しめる。
(57) [Summary] [Problem] Sludge in an amount sufficient to maintain the target gypsum purity can be introduced into an absorption tower, mixed with gypsum and recovered.
The sludge treatment cost can be reduced. SOLUTION: Sludge discharged from a wastewater treatment device 24 is introduced into an absorption tower 3, and a sludge flow control valve 26 for adjusting the flow rate of the sludge introduced into the absorption tower 3; a sludge receiving flowmeter 27 for detecting the actual sludge acceptance rate E is actually introduced, the desulfurization gas flowmeter 9 for detecting the desulfurized gas flow a, the absorption tower inlet sO 2 concentration to detect the absorption tower inlet sO 2 concentration B The amount of gypsum C generated in the absorption tower 3 is determined based on the total amount 10, the desulfurization gas flow rate A and the absorption tower inlet SO 2 concentration B, and the set sludge reception flow rate D that can maintain the target gypsum purity based on the gypsum amount C. And a controller 28 for outputting the opening degree command G to the sludge flow rate adjusting valve 26 so that the actual sludge receiving flow rate E becomes equal to the set sludge receiving flow rate D.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排煙脱硫装置吸収
塔への汚泥受入制御方法及び装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling sludge receiving into an absorption tower of a flue gas desulfurization apparatus.
【０００２】[0002]
【従来の技術】吸収剤として炭酸カルシウム（ＣａＣＯ
3）を用いた排煙脱硫装置は、一般に図３に示されるよ
うに、下部に吸収液１の液溜部１ａが形成され且つ上部
に多数のスプレーノズル２が配設された吸収塔３と、該
吸収塔３の液溜部１ａの吸収液１を汲み上げ前記スプレ
ーノズル２から噴霧させて循環させる循環ポンプ４と、
前記吸収塔３の液溜部１ａに酸化用の空気を供給する酸
化空気ブロワ５とを備えてなる構成を有している。2. Description of the Related Art Calcium carbonate (CaCO) is used as an absorbent.
The flue gas desulfurization apparatus using 3 ) generally comprises an absorption tower 3 in which a liquid reservoir 1a for absorbing liquid 1 is formed in a lower part and a number of spray nozzles 2 are arranged in an upper part, as shown in FIG. A circulating pump 4 for drawing up the absorbent 1 in the liquid reservoir 1a of the absorption tower 3 and spraying and circulating it from the spray nozzle 2;
An oxidizing air blower 5 that supplies oxidizing air to the liquid reservoir 1a of the absorption tower 3 is provided.
【０００３】前述の如き排煙脱硫装置の場合、吸収液１
が循環ポンプ４の作動によりスプレーノズル２から噴霧
されつつ循環しており、図示していない石炭焚ボイラ等
から吸収塔３に送り込まれた排ガスは、前記スプレーノ
ズル２から噴霧される吸収液１と接触することにより、
ＳＯ2（硫黄酸化物）が吸収除去された後、外部へ排出
される。[0003] In the case of the above-mentioned flue gas desulfurization apparatus, the absorption liquid 1
Is circulated while being sprayed from the spray nozzle 2 by the operation of the circulation pump 4, and the exhaust gas sent to the absorption tower 3 from a coal-fired boiler or the like (not shown) is mixed with the absorbent 1 sprayed from the spray nozzle 2. By contacting
After SO 2 (sulfur oxide) is absorbed and removed, it is discharged to the outside.
【０００４】一方、前記排ガスからＳＯ2を吸収した吸
収液１の一部は、吸収塔３の液溜部１ａの底部から石膏
スラリーとして石膏回収装置６へ導かれ石膏１９が生成
されるようになっている。該石膏回収装置６は、前記吸
収塔３の液溜部１ａの底部から抜き出される吸収液１の
一部をカセイソーダ等の中和剤１２と混合撹拌する中和
タンク１３と、該中和タンク１３から抽出された吸収液
１４を濃縮せしめるシックナ１５と、該シックナ１５で
濃縮された吸収液１６が供給され且つ該吸収液１６を撹
拌する石膏分離機供給タンク１７と、該石膏分離機供給
タンク１７から抽出される吸収液１６を脱水し石膏１９
を生成するための石膏分離機２０と、該石膏分離機２０
で脱水された水２１が供給され且つ該水２１の一部を前
記シックナ１５へ供給するための濾液ピット２２と、前
記シックナ１５から上澄みの吸収液２３が供給される母
液タンク２５とを備えてなる構成を有しており、前記母
液タンク２５内の吸収液２３は、排水処理装置２４へ供
給されるようになっている。On the other hand, a part of the absorbing liquid 1 having absorbed SO 2 from the exhaust gas is guided from the bottom of the liquid reservoir 1 a of the absorption tower 3 to the gypsum collecting device 6 as gypsum slurry so that the gypsum 19 is formed. Has become. The gypsum recovery device 6 includes a neutralization tank 13 for mixing and stirring a part of the absorbent 1 withdrawn from the bottom of the liquid reservoir 1 a of the absorption tower 3 with a neutralizing agent 12 such as caustic soda; A thickener 15 for concentrating the absorbent 14 extracted from the extractor 13, a gypsum separator supply tank 17 for supplying the absorbent 16 concentrated by the thickener 15 and stirring the absorbent 16, and a gypsum separator supply tank The absorbing solution 16 extracted from 17 is dehydrated and the gypsum 19
Gypsum separator 20 for producing gypsum, and the gypsum separator 20
A filtrate pit 22 for supplying water 21 dehydrated in the above and supplying a part of the water 21 to the thickener 15, and a mother liquor tank 25 to which a supernatant absorbent 23 is supplied from the thickener 15. The absorption liquid 23 in the mother liquor tank 25 is supplied to a wastewater treatment device 24.
【０００５】前記排水処理装置２４は、硝化菌の作用に
より吸収液２３に含まれる有害な窒素化合物を分解する
と共に、ＣＯＤ（化学的酸素要求量）で表わされる還元
性物質を高分子材料からなる吸着樹脂により吸着した
後、前記吸収液２３を清浄化された処理水として海等へ
排出するようになっており、又、前記排水処理装置２４
内部に沈殿して残った汚泥は、適宜、産業廃棄物として
処理するようになっている。The wastewater treatment device 24 decomposes harmful nitrogen compounds contained in the absorbing solution 23 by the action of nitrifying bacteria and converts a reducing substance represented by COD (chemical oxygen demand) from a polymer material. After being adsorbed by the adsorption resin, the absorbent 23 is discharged to the sea or the like as purified treated water.
The sludge settled and left inside is appropriately disposed of as industrial waste.
【０００６】又、前記吸収塔３内における吸収液１のｐ
Ｈ（ペーハー）は、ｐＨ計７によって検出され、該ｐＨ
計７によって検出された吸収液１のｐＨが所定の値に一
定に保持されるよう流量調整弁８の開度を制御すること
により、前記吸収塔３には、必要に応じて適宜、所要量
の吸収剤スラリーが供給されるようになっている。[0006] The absorption liquid 1 in the absorption tower 3
H (pH) is detected by the pH meter 7,
By controlling the opening of the flow control valve 8 so that the pH of the absorbing liquid 1 detected by the total 7 is kept constant at a predetermined value, the required amount of the absorbing tower 3 can be appropriately adjusted as needed. Is supplied.
【０００７】[0007]
【発明が解決しようとする課題】ところで、前述の如
く、排水処理装置２４内部に沈殿して残った汚泥を別途
に産業廃棄物として処理するのでは、手間と時間がかか
ると共に費用も嵩むため、最近、前記汚泥を吸収塔３内
へ導入して吸収液１に混入させることにより、最終的に
石膏１９に混ぜて回収することが提案されている。As described above, if the sludge settled in the wastewater treatment device 24 is separately treated as industrial waste, it is troublesome, time-consuming and expensive. Recently, it has been proposed that the sludge is introduced into the absorption tower 3 and mixed with the absorbing liquid 1 so as to be finally mixed with the gypsum 19 and recovered.
【０００８】前記汚泥の絶対量は、生成される石膏１９
の量に比べてごく微量ではあるものの、石膏１９は製品
として販売されるものであり、その純度がおよそ９５％
以上ないと商品価値がなくなるため、前記汚泥を単純に
吸収塔３内へ受け入れたのでは、石膏１９の純度が低下
し、石膏１９の商品価値がなくなってしまう可能性があ
った。The absolute amount of the sludge is determined by the amount of gypsum
Although the amount is very small compared to the amount of gypsum, gypsum 19 is sold as a product and its purity is about 95%.
If the sludge is simply received into the absorption tower 3, the purity of the gypsum 19 is reduced, and the commercial value of the gypsum 19 may be lost.
【０００９】本発明は、斯かる実情に鑑み、目標石膏純
度を維持できるだけの量の汚泥を吸収塔内へ導入し、石
膏に混ぜて回収することができ、汚泥処理費用の削減を
図り得る排煙脱硫装置吸収塔への汚泥受入制御方法及び
装置を提供しようとするものである。In view of such circumstances, the present invention can introduce sludge in an amount sufficient to maintain the target gypsum purity into the absorption tower, mix it with gypsum and collect it, and can reduce the sludge treatment cost. An object of the present invention is to provide a method and an apparatus for controlling sludge reception into a smoke desulfurization unit absorption tower.
【００１０】[0010]
【課題を解決するための手段】本発明は、排水処理装置
から排出される汚泥を吸収塔内へ導入するようにした排
煙脱硫装置吸収塔への汚泥受入制御方法であって、脱硫
ガス流量と吸収塔入口ＳＯ2濃度と吸収塔内へ実際に導
入される実際汚泥受入流量とを検出し、前記脱硫ガス流
量と吸収塔入口ＳＯ2濃度とに基づき吸収塔内で生成さ
れる石膏量を求め、該石膏量に基づき目標石膏純度を維
持できるだけの設定汚泥受入流量を求め、前記実際汚泥
受入流量を設定汚泥受入流量と等しくなるよう制御する
ことを特徴とする排煙脱硫装置吸収塔への汚泥受入制御
方法にかかるものである。SUMMARY OF THE INVENTION The present invention relates to a method for controlling sludge reception in an absorption tower of a flue gas desulfurization apparatus, wherein sludge discharged from a wastewater treatment apparatus is introduced into the absorption tower. the absorption tower inlet sO 2 concentration actually be detecting the actual sludge receiving flow introduced into the absorption tower, the gypsum volume generated in the absorption tower based on said desulfurized gas flow rate and the absorption tower inlet sO 2 concentration Determining the set sludge receiving flow rate that can maintain the target gypsum purity based on the gypsum amount, and controlling the actual sludge receiving flow rate to be equal to the set sludge receiving flow rate to the flue gas desulfurization device absorption tower, It relates to a method for controlling sludge reception.
【００１１】又、本発明は、排水処理装置から排出され
る汚泥を吸収塔内へ導入するようにした排煙脱硫装置吸
収塔への汚泥受入制御装置であって、排水処理装置から
吸収塔内へ導入される汚泥の流量を調節する汚泥流量調
整弁と、吸収塔内へ実際に導入される実際汚泥受入流量
を検出する汚泥受入流量計と、脱硫ガス流量を検出する
脱硫ガス流量計と、吸収塔入口ＳＯ2濃度を検出する吸
収塔入口ＳＯ2濃度計と、前記脱硫ガス流量と吸収塔入
口ＳＯ2濃度とに基づき吸収塔内で生成される石膏量を
求め、該石膏量に基づき目標石膏純度を維持できるだけ
の設定汚泥受入流量を求め、前記実際汚泥受入流量が設
定汚泥受入流量と等しくなるよう汚泥流量調整弁へ開度
指令を出力する制御器とを備えたことを特徴とする排煙
脱硫装置吸収塔への汚泥受入制御装置にかかるものであ
る。[0011] The present invention also relates to a sludge receiving control apparatus for introducing sludge discharged from a wastewater treatment apparatus into an absorption tower, wherein the sludge is supplied from a wastewater treatment apparatus to an absorption tower. A sludge flow control valve that controls the flow rate of sludge introduced into the absorption tower, a sludge reception flow meter that detects the actual sludge reception flow rate that is actually introduced into the absorption tower, and a desulfurization gas flow meter that detects the desulfurization gas flow rate, and the absorption tower inlet SO 2 concentration meter for detecting the absorption tower inlet SO 2 concentration, calculated gypsum amount generated in the absorption tower based on said desulfurized gas flow rate and the absorption tower inlet SO 2 concentration, the target on the basis of the plaster weight A controller for obtaining a set sludge receiving flow rate that can maintain gypsum purity, and outputting an opening command to a sludge flow rate regulating valve so that the actual sludge receiving flow rate becomes equal to the set sludge receiving flow rate. Smoke desulfurization equipment Those relating to the mud receiving control device.
【００１２】上記手段によれば、以下のような作用が得
られる。According to the above means, the following effects can be obtained.
【００１３】本発明の排煙脱硫装置吸収塔への汚泥受入
制御方法においては、排煙脱硫装置の運転時には、脱硫
ガス流量と吸収塔入口ＳＯ2濃度と吸収塔内へ実際に導
入される実際汚泥受入流量とが検出され、前記脱硫ガス
流量と吸収塔入口ＳＯ2濃度とに基づき吸収塔内で生成
される石膏量が求められ、該石膏量に基づき目標石膏純
度を維持できるだけの設定汚泥受入流量が求められ、前
記実際汚泥受入流量が設定汚泥受入流量と等しくなるよ
う制御が行われ、設定汚泥受入流量と等しい量の汚泥が
吸収塔内へ導入される。[0013] In sludge admission control method for flue desulfurizer absorption tower of the present invention, during operation of the flue gas desulfurization system, in fact is actually introduced into the desulfurizing gas flow rate and the absorption tower inlet SO 2 concentration and the absorption tower are detected and sludge acceptance rate, the desulfurization gas flow rate and gypsum amount generated in the absorption tower inlet SO 2 concentration and absorption tower based on are determined, setting sludge accept only the target gypsum purity can be maintained on the basis of the plaster weight The flow rate is determined, control is performed so that the actual sludge receiving flow rate is equal to the set sludge receiving flow rate, and sludge having an amount equal to the set sludge receiving flow rate is introduced into the absorption tower.
【００１４】又、本発明の排煙脱硫装置吸収塔への汚泥
受入制御装置においては、排煙脱硫装置の運転時には、
汚泥受入流量計によって吸収塔内へ実際に導入される実
際汚泥受入流量が検出されると共に、脱硫ガス流量計に
よって脱硫ガス流量が検出され、且つ吸収塔入口ＳＯ2
濃度計によって吸収塔入口ＳＯ2濃度が検出され、制御
器において、前記脱硫ガス流量と吸収塔入口ＳＯ2濃度
とに基づき吸収塔内で生成される石膏量が求められ、該
石膏量に基づき目標石膏純度を維持できるだけの設定汚
泥受入流量が求められ、前記実際汚泥受入流量が設定汚
泥受入流量と等しくなるよう汚泥流量調整弁へ開度指令
が出力され、該汚泥流量調整弁の開度が調節され、前記
設定汚泥受入流量と等しい量の汚泥が吸収塔内へ導入さ
れる。In the control apparatus for receiving sludge into the absorption tower of the flue gas desulfurization apparatus according to the present invention, when the flue gas desulfurization apparatus is operated,
The actual sludge receiving flow rate actually introduced into the absorption tower is detected by the sludge receiving flow meter, the desulfurizing gas flow rate is detected by the desulfurizing gas flow meter, and the absorption tower inlet SO 2
Is detected absorption tower inlet SO 2 concentration by the concentration meter, at the controller, the plaster amount generated in the absorption tower based on the desulfurization gas flow rate and the absorption tower inlet SO 2 concentration is determined and the target on the basis of the plaster weight A set sludge receiving flow rate that can maintain gypsum purity is determined, an opening command is output to the sludge flow control valve so that the actual sludge receiving flow becomes equal to the set sludge receiving flow, and the opening degree of the sludge flow adjusting valve is adjusted. Then, an amount of sludge equal to the set sludge receiving flow rate is introduced into the absorption tower.
【００１５】この結果、本発明の排煙脱硫装置吸収塔へ
の汚泥受入制御方法及び装置においては、生成される石
膏の純度を低下させずに目標石膏純度を維持しつつ、汚
泥を石膏に混ぜて回収することが可能となり、石膏の商
品価値が確保されると共に、汚泥処理費用も削減される
こととなる。As a result, in the method and apparatus for controlling sludge reception in the flue gas desulfurization unit absorption tower of the present invention, the sludge is mixed with gypsum while maintaining the target gypsum purity without reducing the purity of the gypsum produced. Thus, the commercial value of the gypsum is ensured and the sludge treatment cost is reduced.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施の形態を図示
例と共に説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１７】図１及び図２は本発明を実施する形態の一
例であって、図中、図３と同一の符号を付した部分は同
一物を表わしており、排水処理装置２４から排出される
汚泥を吸収塔３内へ導入するようにすると共に、排水処
理装置２４から吸収塔３内へ導入される汚泥の流量を調
節する汚泥流量調整弁２６と、吸収塔３内へ実際に導入
される実際汚泥受入流量Ｅを検出する汚泥受入流量計２
７と、脱硫ガス流量Ａを検出する脱硫ガス流量計９と、
吸収塔入口ＳＯ2濃度Ｂを検出する吸収塔入口ＳＯ2濃度
計１０と、前記脱硫ガス流量Ａと吸収塔入口ＳＯ2濃度
Ｂとに基づき吸収塔３内で生成される石膏量Ｃを求め、
該石膏量Ｃに基づき目標石膏純度（およそ９５％）を維
持できるだけの設定汚泥受入流量Ｄを求め、前記実際汚
泥受入流量Ｅが設定汚泥受入流量Ｄと等しくなるよう汚
泥流量調整弁２６へ開度指令Ｇを出力する制御器２８と
を具備せしめる。FIGS. 1 and 2 show an embodiment of the present invention. In FIG. 1 and FIG. 2, the parts denoted by the same reference numerals as those in FIG. The sludge is introduced into the absorption tower 3, and the sludge flow control valve 26 for adjusting the flow rate of the sludge introduced from the wastewater treatment device 24 into the absorption tower 3 is actually introduced into the absorption tower 3. Sludge receiving flowmeter 2 that detects actual sludge receiving flow rate E
7, a desulfurization gas flow meter 9 for detecting a desulfurization gas flow rate A,
The gypsum amount C generated in the absorption tower 3 is determined based on the absorption tower entrance SO 2 concentration meter 10 for detecting the absorption tower entrance SO 2 concentration B, and the desulfurization gas flow rate A and the absorption tower entrance SO 2 concentration B,
Based on the gypsum amount C, a set sludge receiving flow rate D that can maintain the target gypsum purity (about 95%) is obtained, and the opening degree is set to the sludge flow adjusting valve 26 so that the actual sludge receiving flow rate E becomes equal to the set sludge receiving flow rate D. And a controller 28 for outputting the command G.
【００１８】前記制御器２８は、前記脱硫ガス流量計９
で検出された脱硫ガス流量Ａと前記吸収塔入口ＳＯ2濃
度計１０で検出された吸収塔入口ＳＯ2濃度Ｂと係数α
との積を演算することにより、吸収塔３内で生成される
石膏量Ｃを求めて出力する乗算器２９と、該乗算器２９
から出力される石膏量Ｃに基づき目標石膏純度を維持で
きるだけの設定汚泥受入流量Ｄを求めて出力する関数発
生器３０と、前記関数発生器３０から出力される設定汚
泥受入流量Ｄと前記汚泥受入流量計２７で検出された実
際汚泥受入流量Ｅとの差を求め、汚泥受入流量偏差Ｆを
出力する減算器３１と、該減算器３１から出力される汚
泥受入流量偏差Ｆを比例積分処理して該汚泥受入流量偏
差Ｆをなくすための汚泥流量調整弁２６の開度指令Ｇを
出力する比例積分調節器３２とを備えてなる構成を有し
ている。The controller 28 controls the desulfurization gas flow meter 9
, The SO 2 concentration B of the absorption tower detected by the SO 2 concentration meter 10 and the coefficient α
And a multiplier 29 that calculates and outputs the amount of gypsum C generated in the absorption tower 3 by calculating the product of
Generator 30 for obtaining and outputting a set sludge receiving flow rate D capable of maintaining the target gypsum purity based on the gypsum amount C output from the apparatus, a set sludge receiving flow rate D output from the function generator 30 and the sludge receiving The difference between the actual sludge receiving flow rate E detected by the flow meter 27 and the subtractor 31 that outputs the sludge receiving flow rate deviation F, and the sludge receiving flow rate deviation F output from the subtracter 31 are proportionally integrated and processed. And a proportional-integral controller 32 for outputting an opening command G of the sludge flow regulating valve 26 for eliminating the sludge receiving flow deviation F.
【００１９】尚、前記脱硫ガス流量Ａと吸収塔入口ＳＯ
2濃度Ｂとを掛けると、吸収塔３内へ導入される排ガス
中に含まれるＳＯ2量が求められ、該ＳＯ2量に所定の係
数αを掛ければ、吸収塔３内で生成される石膏量Ｃは求
められる。The desulfurization gas flow rate A and the absorption tower inlet SO
2 multiplied by the concentration B, the amount of SO 2 contained in the exhaust gas introduced into the absorption tower 3 is obtained. By multiplying the SO 2 amount by a predetermined coefficient α, the gypsum generated in the absorption tower 3 is obtained. The quantity C is determined.
【００２０】又、前記関数発生器３０には、図２に示さ
れるような関数が入力されており、該関数は、石膏量Ｃ
の増減に対し略比例させて設定汚泥受入流量Ｄを増減さ
せることを表わしている。A function as shown in FIG. 2 is input to the function generator 30, and the function is
Represents that the set sludge receiving flow rate D is increased / decreased in substantially proportion to the increase / decrease of the set sludge.
【００２１】次に、上記図示例の作動を説明する。Next, the operation of the illustrated example will be described.
【００２２】排煙脱硫装置の運転時には、汚泥受入流量
計２７によって吸収塔３内へ実際に導入される実際汚泥
受入流量Ｅが検出されると共に、脱硫ガス流量計９によ
って脱硫ガス流量Ａが検出され、且つ吸収塔入口ＳＯ2
濃度計１０によって吸収塔入口ＳＯ2濃度Ｂが検出さ
れ、制御器２８の乗算器２９において前記脱硫ガス流量
計９で検出された脱硫ガス流量Ａと前記吸収塔入口ＳＯ
2濃度計１０で検出された吸収塔入口ＳＯ2濃度Ｂと係数
αとの積を演算することにより、吸収塔３内で生成され
る石膏量Ｃが求められて関数発生器３０へ出力され、該
関数発生器３０において前記乗算器２９から出力される
石膏量Ｃに基づき目標石膏純度を維持できるだけの設定
汚泥受入流量Ｄが求められて減算器３１へ出力され、該
減算器３１において前記関数発生器３０から出力される
設定汚泥受入流量Ｄと前記汚泥受入流量計２７で検出さ
れた実際汚泥受入流量Ｅとの差が求められ、汚泥受入流
量偏差Ｆが比例積分調節器３２へ出力され、該比例積分
調節器３２において前記減算器３１から出力される汚泥
受入流量偏差Ｆが比例積分処理されて該汚泥受入流量偏
差Ｆをなくすための開度指令Ｇが汚泥流量調整弁２６へ
出力され、該汚泥流量調整弁２６の開度が調節され、前
記設定汚泥受入流量Ｄと等しい量の汚泥が吸収塔３内へ
導入される。During operation of the flue gas desulfurization apparatus, the actual sludge receiving flow rate E actually introduced into the absorption tower 3 is detected by the sludge receiving flow meter 27, and the desulfurizing gas flow rate A is detected by the desulfurizing gas flow meter 9. And the absorption tower inlet SO 2
The concentration of the SO 2 concentration B at the inlet of the absorption tower is detected by the concentration meter 10.
2 By calculating the product of the absorption tower inlet SO 2 concentration B detected by the concentration meter 10 and the coefficient α, the amount of gypsum C generated in the absorption tower 3 is obtained and output to the function generator 30, In the function generator 30, a set sludge receiving flow rate D that can maintain the target gypsum purity is obtained based on the gypsum amount C output from the multiplier 29, and is output to the subtractor 31, and the function generator 30 generates the function. The difference between the set sludge receiving flow rate D output from the vessel 30 and the actual sludge receiving flow rate E detected by the sludge receiving flow meter 27 is obtained, and the sludge receiving flow rate deviation F is output to the proportional integral controller 32. In the proportional integration controller 32, the sludge receiving flow deviation F output from the subtractor 31 is proportionally integrated, and an opening command G for eliminating the sludge receiving flow deviation F is output to the sludge flow regulating valve 26. Sludge Is adjusted opening amount adjusting valve 26, the sludge in an amount equal to the set sludge receiving flow D is introduced into the absorption tower 3.
【００２３】この結果、生成される石膏１９の純度を低
下させずに目標石膏純度を維持しつつ、汚泥を石膏１９
に混ぜて回収することが可能となり、石膏１９の商品価
値が確保されると共に、汚泥処理費用も削減されること
となる。As a result, the sludge is removed from the gypsum 19 while maintaining the target gypsum purity without reducing the purity of the gypsum 19 produced.
Thus, the commercial value of the gypsum 19 is secured and the sludge treatment cost is reduced.
【００２４】こうして、目標石膏純度を維持できるだけ
の量の汚泥を吸収塔３内へ導入し、石膏１９に混ぜて回
収することができ、汚泥処理費用の削減を図り得る。In this way, an amount of sludge that can maintain the target gypsum purity can be introduced into the absorption tower 3, mixed with the gypsum 19 and collected, and the sludge treatment cost can be reduced.
【００２５】尚、本発明の排煙脱硫装置吸収塔への汚泥
受入制御方法及び装置は、上述の図示例にのみ限定され
るものではなく、本発明の要旨を逸脱しない範囲内にお
いて種々変更を加え得ることは勿論である。It should be noted that the method and apparatus for controlling sludge reception in the flue gas desulfurization apparatus absorption tower of the present invention are not limited to the above-described illustrated examples, and various modifications may be made without departing from the gist of the present invention. Of course, it can be added.
【００２６】[0026]
【発明の効果】以上、説明したように本発明の排煙脱硫
装置吸収塔への汚泥受入制御方法及び装置によれば、目
標石膏純度を維持できるだけの量の汚泥を吸収塔内へ導
入し、石膏に混ぜて回収することができ、汚泥処理費用
の削減を図り得るという優れた効果を奏し得る。As described above, according to the method and apparatus for controlling sludge reception in the flue gas desulfurization apparatus absorption tower of the present invention, sludge is introduced into the absorption tower in an amount sufficient to maintain the target gypsum purity. It can be mixed with gypsum and collected, and can provide an excellent effect that sludge treatment cost can be reduced.
【図１】本発明を実施する形態の一例の全体概要構成図
である。FIG. 1 is an overall schematic configuration diagram of an example of an embodiment of the present invention.
【図２】図１に示す関数発生器に設定されている関数を
表わす線図である。FIG. 2 is a diagram showing functions set in the function generator shown in FIG.
【図３】従来例の全体概要構成図である。FIG. 3 is an overall schematic configuration diagram of a conventional example.
３ 吸収塔 ９ 脱硫ガス流量計 １０ 吸収塔入口ＳＯ2濃度計 １９ 石膏 ２４ 排水処理装置 ２６ 汚泥流量調整弁 ２７ 汚泥受入流量計 ２８ 制御器 ２９ 乗算器 ３０ 関数発生器 ３１ 減算器 ３２ 比例積分調節器 Ａ 脱硫ガス流量 Ｂ 吸収塔入口ＳＯ2濃度 Ｃ 石膏量 Ｄ 設定汚泥受入流量 Ｅ 実際汚泥受入流量 Ｆ 汚泥受入流量偏差 Ｇ 開度指令Reference Signs List 3 Absorption tower 9 Desulfurization gas flow meter 10 Absorption tower inlet SO 2 concentration meter 19 Gypsum 24 Wastewater treatment device 26 Sludge flow control valve 27 Sludge receiving flow meter 28 Controller 29 Multiplier 30 Function generator 31 Subtractor 32 Proportional integration controller A desulfurized gas flow B absorption tower inlet SO 2 concentration C gypsum amount D set sludge receiving flow E actual sludge receiving flow F sludge receiving flow rate difference G opening command
Claims (2)
塔内へ導入するようにした排煙脱硫装置吸収塔への汚泥
受入制御方法であって、 脱硫ガス流量と吸収塔入口ＳＯ2濃度と吸収塔内へ実際
に導入される実際汚泥受入流量とを検出し、前記脱硫ガ
ス流量と吸収塔入口ＳＯ2濃度とに基づき吸収塔内で生
成される石膏量を求め、該石膏量に基づき目標石膏純度
を維持できるだけの設定汚泥受入流量を求め、前記実際
汚泥受入流量を設定汚泥受入流量と等しくなるよう制御
することを特徴とする排煙脱硫装置吸収塔への汚泥受入
制御方法。1. A sludge admission control method for flue gas desulfurization absorber tower so as to introduce a sludge discharged from waste water treatment apparatus to the absorption tower, the absorption tower inlet SO 2 concentration and desulfurized gas flow rate actually be detecting the actual sludge receiving flow introduced into the absorption tower, calculated gypsum amount generated in the absorption tower based on said desulfurized gas flow rate and the absorption tower inlet sO 2 concentration, the target on the basis of the plaster weight A method for controlling sludge reception into an absorption tower of a flue gas desulfurization device, wherein a set sludge reception flow rate that can maintain gypsum purity is determined, and the actual sludge reception flow rate is controlled to be equal to the set sludge reception flow rate.
塔内へ導入するようにした排煙脱硫装置吸収塔への汚泥
受入制御装置であって、 排水処理装置から吸収塔内へ導入される汚泥の流量を調
節する汚泥流量調整弁と、 吸収塔内へ実際に導入される実際汚泥受入流量を検出す
る汚泥受入流量計と、 脱硫ガス流量を検出する脱硫ガス流量計と、 吸収塔入口ＳＯ2濃度を検出する吸収塔入口ＳＯ2濃度計
と、 前記脱硫ガス流量と吸収塔入口ＳＯ2濃度とに基づき吸
収塔内で生成される石膏量を求め、該石膏量に基づき目
標石膏純度を維持できるだけの設定汚泥受入流量を求
め、前記実際汚泥受入流量が設定汚泥受入流量と等しく
なるよう汚泥流量調整弁へ開度指令を出力する制御器と
を備えたことを特徴とする排煙脱硫装置吸収塔への汚泥
受入制御装置。2. A sludge receiving control device for introducing a sludge discharged from a wastewater treatment device into an absorption tower, wherein the sludge is introduced into the absorption tower from the wastewater treatment device. A sludge flow control valve for adjusting the flow rate of sludge, a sludge receiving flow meter for detecting an actual sludge receiving flow rate actually introduced into the absorption tower, a desulfurizing gas flow meter for detecting a desulfurizing gas flow rate, and an absorption tower inlet SO maintaining the absorption tower inlet SO 2 concentration meter that detects the 2 concentration, the seek desulfurizing gas flow rate and gypsum amount generated in the absorption tower inlet SO 2 based on the concentration absorption tower, the target gypsum purity on the basis of the plaster weight A controller for determining a set sludge receiving flow rate as much as possible and outputting an opening command to a sludge flow control valve so that the actual sludge receiving flow rate is equal to the set sludge receiving flow rate. Sludge receiving system to tower Apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31529497A JP3991132B2 (en) | 1997-11-17 | 1997-11-17 | Sludge acceptance control method and apparatus for flue gas desulfurization equipment absorption tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31529497A JP3991132B2 (en) | 1997-11-17 | 1997-11-17 | Sludge acceptance control method and apparatus for flue gas desulfurization equipment absorption tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11147021A true JPH11147021A (en) | 1999-06-02 |
| JP3991132B2 JP3991132B2 (en) | 2007-10-17 |
Family
ID=18063671
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31529497A Expired - Fee Related JP3991132B2 (en) | 1997-11-17 | 1997-11-17 | Sludge acceptance control method and apparatus for flue gas desulfurization equipment absorption tower |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3991132B2 (en) |
-
1997
- 1997-11-17 JP JP31529497A patent/JP3991132B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3991132B2 (en) | 2007-10-17 |
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