JPS6183390A - Concentration of black liquor - Google Patents
Concentration of black liquorInfo
- Publication number
- JPS6183390A JPS6183390A JP19950384A JP19950384A JPS6183390A JP S6183390 A JPS6183390 A JP S6183390A JP 19950384 A JP19950384 A JP 19950384A JP 19950384 A JP19950384 A JP 19950384A JP S6183390 A JPS6183390 A JP S6183390A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- black liquor
- recovery boiler
- pressure steam
- concentrator
- 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.)
- Pending
Links
- 238000011084 recovery Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
Landscapes
- Paper (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、パルプ廃液である黒液を合理的に濃縮する方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for rationally concentrating black liquor, which is pulp waste liquid.
従来、パルプ廃液である黒液の処理として、これを濃縮
したのち回収ボイラにて燃焼してエネルギーを回収する
ことが行われていた。すなわち、第２図に示すように、
赤黒液１を多重効用蒸発装置２にて蒸発濃縮し、この濃
縮黒液３を回収ボイラ４に導き燃焼して高圧蒸気を得、
発電機６のタービン７を駆動し、排出される低圧蒸気８
の一部を多重効用蒸発装置２の加熱源として利用するも
のであった。Conventionally, black liquor, which is pulp waste liquid, has been treated by concentrating it and then burning it in a recovery boiler to recover energy. That is, as shown in Figure 2,
A red black liquor 1 is evaporated and concentrated in a multiple effect evaporator 2, and this concentrated black liquor 3 is led to a recovery boiler 4 and combusted to obtain high pressure steam,
Low pressure steam 8 that drives the turbine 7 of the generator 6 and is discharged
A part of the evaporator was used as a heating source for the multiple effect evaporator 2.
図中、９は多重効用蒸発装置２からの復水で回収ボイラ
４に導かれ、１０は回収ボイラ４からの燃焼排ガス、１
１はタービン７から排出される中圧蒸気、１２は多重効
用蒸発装置２のドレンである。In the figure, 9 is condensate from the multiple effect evaporator 2 and is led to the recovery boiler 4, 10 is the combustion exhaust gas from the recovery boiler 4, and 1
1 is intermediate pressure steam discharged from the turbine 7, and 12 is a drain of the multiple effect evaporator 2.
前述したように従来の黒液の濃縮には、黒液の粘度が高
いために直接接触式の濃縮装置を用いることができず、
間接加熱型の多重効用に発装置を用いて行われていたが
、粘度による伝熱係数の低下及びスケールの付着等によ
り効率が悪くなり、約７０係程度までｊ濃縮するのが限
度であった。したがって、約７０φ程度に濃縮した黒液
を回収ボイラで燃焼してもエネルギー回収には限度があ
り、効率もよいものではなかった。As mentioned above, in conventional black liquor concentration, direct contact type concentrators cannot be used due to the high viscosity of black liquor.
This was done using an indirect heating type multi-effect generator, but the efficiency deteriorated due to a decrease in the heat transfer coefficient due to viscosity and the adhesion of scale, and the limit was that it could be concentrated to about 70%. . Therefore, even if black liquor concentrated to about 70φ is burned in a recovery boiler, there is a limit to energy recovery and efficiency is not good.
本発明は、このような問題点を解決し、黒液ので蹟度を
７８〜９０％まで濃縮することを可能にし、回収ボイラ
のエネルギー回収率を高め、しかもエネルギー使用量の
節減を計ろうとするものである。The present invention solves these problems, makes it possible to concentrate black liquor to 78-90%, increases the energy recovery rate of the recovery boiler, and aims to reduce energy consumption. It is something.
本発明は、黒液を蒸発濃縮し、回収ボイラの熱源として
高圧蒸気を得るに際し、前記蒸発濃縮工程を２分し、一
次濃縮工程に多重効用蒸発装置を用い、二次濃縮工程に
前記回収ボイラで得られた高圧蒸気を熱源として利用す
る高濃度７１ｉ縮装置ｔを用い、該高濃度濃縮装置から
排出される蒸気を前記多重効用蒸発装置の加熱源に利用
することを特徴とするものである。In the present invention, when black liquor is evaporated and concentrated to obtain high-pressure steam as a heat source for a recovery boiler, the evaporation and concentration process is divided into two, a multi-effect evaporator is used in the primary concentration process, and the recovery boiler is used in the secondary concentration process. It is characterized by using a high concentration 71i condenser t that uses the high pressure steam obtained in the above as a heat source, and using the steam discharged from the high concentration concentrator as a heat source for the multiple effect evaporator. .
本発明の一実施例を第１図を参照しつつ説明すれば、希
黒液１は、多重効用蒸発装置２に導かれ、後述する高濃
度濃縮装置１３において使用済の蒸気と黒液からの蒸発
蒸気からなる低圧蒸発蒸気１４を加熱源として一次濃縮
が行われ、約７０％程度の濃縮黒液となる。次に、さら
に回収ボイラ４でのエネルギ回収を高めるために、この
濃縮黒液３は高濃度濃縮装置１３に送られ、回収ボイラ
４にて得られタービン７の駆動源となる高温の高圧蒸気
の一部を熱源としてさらに水分の蒸発を受け、７８〜９
（ｌの高濃縮黒液１５となり、これを回収ボイラ４で燃
焼することによって発生蒸気量が増加し、エネルギ回収
の増加となる。An embodiment of the present invention will be described with reference to FIG. 1. A dilute black liquor 1 is introduced into a multiple effect evaporator 2, and a high concentration concentrator 13 (to be described later) separates the used vapor from the black liquor. Primary concentration is performed using the low-pressure vaporized vapor 14 made of vaporized vapor as a heating source, resulting in approximately 70% concentrated black liquor. Next, in order to further increase the energy recovery in the recovery boiler 4, this concentrated black liquor 3 is sent to the high concentration concentrator 13, and the high-temperature high-pressure steam obtained in the recovery boiler 4 and used as the driving source for the turbine 7 is produced. Part of the water was used as a heat source to further evaporate water, resulting in 78-9
(L of highly concentrated black liquor 15 is obtained, and by burning this in the recovery boiler 4, the amount of generated steam increases, resulting in an increase in energy recovery.
この高濃度濃縮装置１３では、その低圧蒸発蒸気１４が
多重効用蒸発装置２の加熱源となるために、高濃度濃縮
装置１３内の圧力は低圧蒸気程度に保つ必要があるが、
装置内を高温にすることは黒液の粘性を低下させる条件
となり、有利である。In this high concentration concentrator 13, the low pressure evaporated steam 14 serves as a heating source for the multiple effect evaporator 2, so the pressure inside the high concentration concentrator 13 needs to be maintained at about the level of low pressure steam.
Raising the temperature inside the apparatus is advantageous because it becomes a condition for reducing the viscosity of the black liquor.
すなわち、高濃度濃縮装置１３としては、間接加熱型は
勿論のこと、蒸気と黒液とを直接接触させる有利な直接
接触式濃縮可能置を使用することができる。That is, as the high concentration concentrating device 13, not only an indirect heating type but also an advantageous direct contact type concentrating device that brings steam and black liquor into direct contact can be used.
黒液の粘性と液温との関係については、大気圧下での沸
点以上の温度域では液温か３０〜４０℃上昇する毎に粘
性は約１名。となり、また総括伝熱系数Ｕ値は、粘度が
１４゜になると１．５〜２倍となり、粘度が下がる程上
昇率が高い。したがって、液温か高くなるように缶内圧
力を高くすれば、Ｕ値は向上し、また低粘性化により所
要動力も軽減される。また、直接接触式濃縮も可能とな
り、設備費も低下する。Regarding the relationship between black liquor viscosity and liquid temperature, in the temperature range above the boiling point under atmospheric pressure, the viscosity increases by about 1 for every 30 to 40°C rise in liquid temperature. The overall heat transfer coefficient U value increases by 1.5 to 2 times when the viscosity reaches 14°, and the rate of increase increases as the viscosity decreases. Therefore, if the pressure inside the can is increased to increase the liquid temperature, the U value will improve and the required power will also be reduced due to lower viscosity. In addition, direct contact concentration is also possible, reducing equipment costs.
一例をあげると、８５％濃度のＫＰ黒液は、大気圧下、
液温１２５℃において、
粘度−２００００〜３００００ｃｐ で、直接接触式
濃縮は不可、
ｃａ １
間接攪拌型でＵ＝２００〜３００ ４２．ｈｌ、Ｏｃ
であるが、
缶内圧力４ ｋｇｆ／ｆｆｌ Ｇ 、液温１８０℃にお
いては、粘度−７００〜ｓ ｏ ｏ ｃｐで、
直接接触式濃縮可能
間接攪拌型でＵ＝ ７００〜８００１ｃ０３’／７１１
．ｈｒ−℃となり、粘性は下がり、Ｕ値も向上する。For example, KP black liquor with a concentration of 85% is
At liquid temperature of 125°C, viscosity is -20,000 to 30,000 cp, direct contact concentration is not possible, ca 1 indirect stirring type, U = 200 to 300 42. hl,Oc
However, at an internal pressure of 4 kgf/ffl G and a liquid temperature of 180°C, the viscosity is -700 to s o cp, and U = 700 to 8001c03'/711 in a direct contact type condensable indirect stirring type.
．． hr-°C, the viscosity decreases, and the U value also improves.
さらにまた、多重効用蒸発装置２と高濃度濃縮装置１３
間のエネルギーｌ々ランスについては、回収ボイラ４で
得られた高圧蒸気５の状態及び高濃縮黒液１５の濃度に
よって変化するものアある。Furthermore, a multiple effect evaporator 2 and a high concentration concentrator 13
The energy in between varies depending on the state of the high pressure steam 5 obtained in the recovery boiler 4 and the concentration of the highly concentrated black liquor 15.
したがって、多重効用蒸発装置２へ供給する高濃度濃縮
装置１３からの低圧蒸発蒸気１４が余剰となった場合は
、その余剰分を回収ボイラ４にて再度加熱し、高圧蒸気
５として再利用することも可能である。Therefore, if there is a surplus of low-pressure evaporated steam 14 from the high-concentration concentrator 13 supplied to the multiple effect evaporator 2, the surplus can be heated again in the recovery boiler 4 and reused as high-pressure steam 5. is also possible.
以上述べたように、本発明は、黒液を濃縮するに際し、
黒液の粘性に適合した濃縮方法を合理的に組み合わせる
ことにより、蒸気の利用効率が向上し、また黒液が高濃
度に濃縮されることによつて黒液からの回収エネルギー
が増大し、全体として省エネルギ一対策上きわめて大な
る効果を有するものである。As described above, the present invention provides the following advantages when concentrating black liquor:
By rationally combining concentration methods that match the viscosity of black liquor, the efficiency of steam utilization is improved, and by concentrating the black liquor to a high concentration, the energy recovered from the black liquor is increased, and the overall This is extremely effective in terms of energy saving measures.
第１図は本発明の一実施例を示す系統説明図で、第２図
は従来例を示す系統説明図である。
１・・・・・・希黒液、 ２・・・・・・多重効用蒸
発装置、３・・・・・・濃縮黒液、 ４・・・・・・
回収ボイラ、 ５・・・・・・高圧蒸気、 ６・・
・・・・発電機、 ７・・・・・・タービン、 ８
・・・・・・低圧蒸気、 ９・・・・・・復水、 １
０・・・・・・燃焼排ガス、 １１・・・・・・中圧
蒸気、 １２・・・・・・ドレン、 １３・・・・
・・高濃度濃縮装置、 １４・・・・・・低圧蒸発蒸気
、 １５・・・・・・高濃縮液。
特許出願人 株式会社荏原製作所
代理人 弁理士 高 木 正 行
代理人 弁理士 依 １）孝 次 部手続補正書
昭和５９年１１月１ｑ 日FIG. 1 is a system explanatory diagram showing one embodiment of the present invention, and FIG. 2 is a system explanatory diagram showing a conventional example. 1... Dilute black liquor, 2... Multi-effect evaporator, 3... Concentrated black liquor, 4...
Recovery boiler, 5... High pressure steam, 6...
... Generator, 7 ... Turbine, 8
・・・・・・Low pressure steam, 9・・・Condensate, １
0... Combustion exhaust gas, 11... Medium pressure steam, 12... Drain, 13...
... High concentration concentrator, 14 ... Low pressure evaporation steam, 15 ... Highly concentrated liquid. Patent Applicant Ebara Corporation Agent Patent Attorney Masayuki Takagi Agent Patent Attorney Yori 1) Takatsugu Department Procedural Amendment November 1q, 1980
Claims (1)
て高圧蒸気を得るに際し、前記蒸発濃縮工程を２分し、
一次濃縮工程に多重効用蒸発装置を用い、二次濃縮工程
に前記回収ボイラで得られた高圧蒸気を熱源として利用
する高濃度濃縮装置を用い、該高濃度濃縮装置から排出
される蒸気を前記多重効用蒸発装置の加熱源に利用する
ことを特徴とする黒液濃縮方法。 ２、前記高濃度濃縮装置から排出される蒸気の余剰分を
前記回収ボイラにて再加熱し、前記高濃度濃縮の熱源と
して再利用するものである特許請求の範囲第１項記載の
黒液濃縮方法。 ３、前記高濃度濃縮装置が黒液と高圧蒸気とを直接接触
させるものである特許請求の範囲第１項又は第２項記載
の黒液濃縮方法。[Claims] 1. When black liquor is evaporated and concentrated and used as a heat source for a recovery boiler to obtain high-pressure steam, the evaporation and concentration step is divided into two,
A multi-effect evaporator is used in the primary concentration process, and a high-concentration concentrator that uses high-pressure steam obtained from the recovery boiler as a heat source is used in the secondary concentration process, and the steam discharged from the high-concentration concentrator is A method for concentrating black liquor, characterized in that it is used as a heating source for an evaporator. 2. Black liquor concentration according to claim 1, wherein surplus steam discharged from the high concentration concentrator is reheated in the recovery boiler and reused as a heat source for the high concentration concentration. Method. 3. The black liquor concentration method according to claim 1 or 2, wherein the high concentration concentration device brings black liquor into direct contact with high pressure steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19950384A JPS6183390A (en) | 1984-09-26 | 1984-09-26 | Concentration of black liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19950384A JPS6183390A (en) | 1984-09-26 | 1984-09-26 | Concentration of black liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6183390A true JPS6183390A (en) | 1986-04-26 |
Family
ID=16408900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19950384A Pending JPS6183390A (en) | 1984-09-26 | 1984-09-26 | Concentration of black liquor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6183390A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880983A (en) * | 2010-06-20 | 2010-11-10 | 九江九洲节能环保工程有限公司 | Inspissation treating method and device for black liquor |
-
1984
- 1984-09-26 JP JP19950384A patent/JPS6183390A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880983A (en) * | 2010-06-20 | 2010-11-10 | 九江九洲节能环保工程有限公司 | Inspissation treating method and device for black liquor |
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