JPS6149920A - Waste incinerator - Google Patents
Waste incineratorInfo
- Publication number
- JPS6149920A JPS6149920A JP59170799A JP17079984A JPS6149920A JP S6149920 A JPS6149920 A JP S6149920A JP 59170799 A JP59170799 A JP 59170799A JP 17079984 A JP17079984 A JP 17079984A JP S6149920 A JPS6149920 A JP S6149920A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- exhaust gas
- bleed
- heat exchanger
- bleed air
- 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
- 239000002699 waste material Substances 0.000 title abstract description 22
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 18
- 230000023556 desulfurization Effects 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 38
- 230000001877 deodorizing effect Effects 0.000 claims description 6
- 239000000567 combustion gas Substances 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 238000004056 waste incineration Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 7
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 238000004332 deodorization Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 239000010801 sewage sludge Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000010849 combustible waste Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/006—General arrangement of incineration plant, e.g. flow sheets
Landscapes
- Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は下水汚泥等の廃棄物を焼却するために使用され
る多段焼却炉と排ガス処理装置とからなる廃棄物焼却装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a waste incinerator comprising a multistage incinerator and an exhaust gas treatment device used to incinerate waste such as sewage sludge.
（従来の技術）
下水汚泥の脱水ケーキのような高カロリーの自燃性廃棄
物の焼却には従来から多段式焼却炉が広く用いられてお
り、投入される自燃性廃棄物の水分含有率や発熱量の変
動により炉内温度が許容範囲を越えて変動することを防
止するために炉内の燃焼段の温度が許容値以上に上昇し
たときに燃焼段から高温の燃焼ガスを抽気するようにし
たものや、排ガス循環流を調節して燃焼段の温度制御を
″行うようにしたもの等が知られている。（例え
ば、特公昭４８−３６２６９号公報、特開昭５８−５５
６０８号公報）
（発明が解決しようとする問題点）
ところが上記のような従来の廃棄物焼却装置においては
炉内の温度制御のみを目的とした制御が行われており、
多段焼却炉の排ガス処理装置をも含んだ廃棄物焼却装置
全体の最適な温度制御についての配慮が不足したもので
あった。即ち、都市近郊に設置されるこの種の廃棄物焼
却装置においては抽気ガスを含む排ガスを脱硫塔により
脱硫したうえ脱臭炉あるいは触媒反応塔のような脱臭装
置で脱臭することが不可欠な条件であり、これらの排ガ
ス処理装置を通過させる排ガスにも複雑な温度制御が必
要とされるものであるが、従来はこれらの排ガス処理工
程を無視して抽気等が行われていたために高温の燃焼ガ
スが多量に抽気されたような場合には排ガス処理装置へ
送り込まれる排ガスの温度が不安定となり、システム全
体として見た場合にはエネルギーの無駄を生じ易いうえ
、安定した排ガス処理を行い難い欠点があった。(Prior technology) Multi-stage incinerators have been widely used to incinerate high-calorie combustible wastes such as dehydrated cakes of sewage sludge. In order to prevent the temperature inside the furnace from fluctuating beyond the permissible range due to fluctuations in the amount, high-temperature combustion gas is extracted from the combustion stage when the temperature of the combustion stage in the furnace rises above the permissible value. There are also known devices that control the temperature of the combustion stage by adjusting the exhaust gas circulation flow.
(Publication No. 608) (Problems to be Solved by the Invention) However, in the conventional waste incinerator as described above, control is performed only for the purpose of controlling the temperature inside the furnace.
There was insufficient consideration given to the optimal temperature control of the entire waste incinerator, including the exhaust gas treatment equipment of the multistage incinerator. In other words, in this type of waste incinerator installed in the suburbs of cities, it is essential to desulfurize the exhaust gas containing extracted gas in a desulfurization tower and then deodorize it in a deodorization device such as a deodorization furnace or catalytic reaction tower. Complex temperature control is also required for the exhaust gas that passes through these exhaust gas treatment devices, but in the past, these exhaust gas treatment processes were ignored and extraction etc. were performed, resulting in high temperature combustion gas. If a large amount of air is extracted, the temperature of the exhaust gas sent to the exhaust gas treatment equipment becomes unstable, which tends to waste energy when looking at the system as a whole, and has the disadvantage that stable exhaust gas treatment is difficult. Ta.
（問題点を解決するための手段）
本発明はこのような従来の問題点を解決するために完成
されたものであり、多段焼却炉に脱硫塔と脱硫後の排ガ
スを加熱する熱交換器と脱臭装置とを接続し、該熱交換
器の加熱流体供給口には多段焼却炉から燃焼ガスを抽気
する抽気ダクトを接続するとともに、該抽気ダクトには
炉内温度が設定温度よりも下降したとき抽気量を低水準
に保ち、炉内温度が設定温度よりも上昇したときには前
記熱交換器の出入口付近の排ガス温度に基き抽気量を制
御する抽気量制御弁を設けたことを特徴とするものであ
る。(Means for Solving the Problems) The present invention was completed in order to solve these conventional problems, and includes a multistage incinerator, a desulfurization tower, and a heat exchanger for heating the exhaust gas after desulfurization. A deodorizing device is connected to the heating fluid supply port of the heat exchanger, and an air extraction duct for extracting combustion gas from the multistage incinerator is connected to the heating fluid supply port of the heat exchanger. The method is characterized by being provided with a bleed air amount control valve that maintains the bleed air amount at a low level and controls the bleed air amount based on the exhaust gas temperature near the entrance and exit of the heat exchanger when the temperature inside the furnace rises above a set temperature. be.
（実施例）
次に本発明を図示の実施例について詳細に説明すれば、
（１）は１０段タイプの多段焼却炉であり、上方の（Ｔ
１）〜（Ｔ４）の４段が乾燥段、中央の（Ｔ５）〜（Ｔ
９）が燃焼段、最下部の（ＴｌＯ）が冷却段とされてい
る。多段焼却炉（１）の頂部には廃棄物供給口（２）と
排ガス流出口（３）が設けられる一方、底部即ち冷却段
の下部には焼却灰排出口（４）が設けられている。燃焼
段には熱風炉（５）からの熱風を吹込む熱風ダクト（６
）と、排ガス流出口（３）から流出した比較的低温の排
ガスの一部を循環させるための排ガスダクト（７）とが
接続されており、これらの各ダクトに設けられた弁（８
）、（９）を制御器（＋０１により制御して炉内温度を
一定に維持することは従来の多段焼却炉と同様である。(Example) Next, the present invention will be explained in detail with reference to the illustrated example.
(1) is a 10-stage type multi-stage incinerator, with the upper (T
1) to (T4) are drying stages, and the center (T5) to (T
9) is the combustion stage, and the bottom (TlO) is the cooling stage. A waste inlet (2) and an exhaust gas outlet (3) are provided at the top of the multistage incinerator (1), while an incinerated ash outlet (4) is provided at the bottom, ie, the lower part of the cooling stage. The combustion stage has a hot air duct (6) that blows hot air from the hot air furnace (5).
) is connected to an exhaust gas duct (7) for circulating a part of the relatively low temperature exhaust gas flowing out from the exhaust gas outlet (3), and a valve (8
), (9) are controlled by the controller (+01) to maintain the temperature inside the furnace at a constant level, as in the conventional multi-stage incinerator.
（１１）は排ガス処理装置の一部を構成する脱硫塔であ
り、高温の排ガスはこの内部で脱硫に適した温度まで冷
却されたうえで脱硫及び除塵される。また、（１２）は
脱硫塔（１１）を出た低温の排ガスを脱臭に適した高温
度まで加熱する加熱炉（１３）と脱臭塔（１４）とによ
り構成される脱臭装置である。このように排ガスは脱硫
塔（１１）により冷却された後に脱臭のために高温度ま
で加熱される必要があるので、熱エネルギの有効利用を
図るために脱硫塔（１１）と脱臭装置（１２）との間に
は二つの熱交換器（１５）、（１６）が設けられる。熱
交換器（１５）は脱臭装置（１２）を出た高温度の排ガ
スを熱源として脱硫塔（１１）を出た４０℃程度の排ガ
スを２５０“Ｃ前後まで加熱するものである。ま１こ、
熱交換器（１６）はその加熱流体供給口に多段焼却炉（
１）の燃焼段から８００ ’Ｃ程度の高温の燃焼ガスを
抽気する抽気ダクｌ−（１７）を接続し、熱交換ｇ５（
１５）を出た排ガスを４００°Ｃ前後まで加熱するもの
である。（１８）は抽気ダクト（１７）に設けられた抽
気量制御弁、（１９）は制御器、（２０）は多段焼却炉
（１）の乾燥段に設置された温度計、（２１）は熱交換
器（１６）の出入口付近に設置された温度計であり、廃
棄物の発熱量の減少や水分量の増大により着火が不活発
となり、多段焼却炉（１）の炉内温度が設定値よりも下
降したことが温度計（２０）により検知されたとき制御
器（１９）が抽気量制御弁（１８）を作動させて抽気量
を低水準に保たせ、逆に廃棄物の発熱量の増加や水分量
の減少により着火が活発化して炉内温度が設定値よりも
上昇したことが温度計（２０）により検知されたときに
は温度計（２１）によって測定される排ガス温度に基き
抽気量の制御を行わせるものである。なお、抽翠された
排ガスは熱交換器（１６）を通過したのち脱硫塔（１１
）へ送られることは図示のとおりである。(11) is a desulfurization tower that constitutes a part of the exhaust gas treatment device, and the high-temperature exhaust gas is cooled to a temperature suitable for desulfurization inside the tower, and then desulfurized and dust is removed. Further, (12) is a deodorizing device composed of a heating furnace (13) that heats the low-temperature exhaust gas exiting the desulfurization tower (11) to a high temperature suitable for deodorization, and a deodorization tower (14). In this way, the exhaust gas needs to be heated to a high temperature for deodorization after being cooled by the desulfurization tower (11), so in order to effectively use thermal energy, a desulfurization tower (11) and a deodorization device (12) are installed. Two heat exchangers (15) and (16) are provided between the two. The heat exchanger (15) uses the high-temperature exhaust gas exiting the deodorizing device (12) as a heat source to heat the exhaust gas exiting the desulfurization tower (11) at around 40°C to around 250"C. ,
The heat exchanger (16) has a multi-stage incinerator (
The bleed duct l-(17) which bleeds high temperature combustion gas of about 800'C from the combustion stage of 1) is connected, and the heat exchange g5(
15) is heated to around 400°C. (18) is the bleed air amount control valve installed in the bleed air duct (17), (19) is the controller, (20) is the thermometer installed in the drying stage of the multistage incinerator (1), and (21) is the heat exchanger. This is a thermometer installed near the entrance and exit of the exchanger (16), and indicates that ignition becomes inactive due to a decrease in the calorific value of waste and an increase in moisture content, and the temperature inside the multistage incinerator (1) falls below the set value. When the thermometer (20) detects that the temperature has dropped, the controller (19) operates the bleed air amount control valve (18) to maintain the bleed air amount at a low level, and conversely increases the calorific value of the waste. When the thermometer (20) detects that the temperature inside the furnace has risen above the set value due to activation of ignition due to a decrease in moisture content It is something that allows people to do this. Note that the extracted exhaust gas passes through a heat exchanger (16) and then passes through a desulfurization tower (11).
) as shown in the figure.
（作用）
このように構成されたものは、多段焼却炉（１３の燃焼
段の温度を熱風炉（５）からの熱風により廃棄物が燃焼
するに必要な温度以上としたうえで廃棄物供給口（２）
から下水汚泥の脱水ケーキのような廃棄物を投入すれば
、廃棄物は乾燥段において上向するガス流と接触して乾
燥されたのち燃焼段において着火燃焼し、冷却段の下部
の焼却灰排出口（４）から焼却灰として排出される一方
、排ガス流出口（３）から排出される排ガスはその一部
を排ガスダクト（７）を介して燃焼段に循環させ、残部
は脱硫塔（１１）で脱硫及び除塵されたうえ脱臭装置（
１２）により脱臭されて煙突（２２）から放出されるこ
とは従来の廃棄物焼却装置と同様である。しかし、本発
明においては多段焼却炉（１）から抽気された高温の抽
気ガスを加熱源として脱硫後の排ガスを加熱する熱交換
２Ｍ（１６）が設けられているうえ、廃棄物の着火が不
活発化して炉内温度が設定値よりも下降したときには抽
気量制御弁（１８）が抽気量を低水準に保つので、炉内
の燃焼段からの抽気による熱量排除は最少限とされて炉
内の温度分布を正常化させるとともに、熱交換器（１６
）にも排ガスを加熱するために必要とされる最低限の熱
量が供給され、外部からの多量の加熱を必要とせず排ガ
スを脱臭するに必要な温度にまで加熱することができる
ものである。また逆に、廃棄物の着火が良好で炉内温度
が設定値よりも上昇したときには抽気量制御弁（１８）
は開度を増してより多量の熱量を燃焼段から排除して炉
内の温度分布の正常化を図るものであるが、その開度は
温度計（２１）によって検出される熱交換器（１６）の
被加熱流体流路側の出入口付近の排ガス温度に基き制御
されるものである。この制御は例えば予め設定された基
準出口温度又は基準出口温度と熱交換器（１６）の出口
又は入口で検出された温度との差をゼロに近付けるよう
に抽気量を制御する方式のほか、熱交換器（１６）の入
口温度と出口温度との差を設定値に近付けるようにする
方式等の種々の制御方式を採用することができ、いずれ
にせよ熱交換器（１６）の出入口付近の排ガス温度を基
準としてこれを一定に保つように抽気量が制御されるの
で、排ガス処理装置に抽気された高温の排ガスが流入し
て排ガス処理装置内の温度が不安定となることがなく、
システム全体として見た場合にはエネルギーの無駄を最
少限にしつつ安定した排ガス処理ができるものである。(Function) In a multi-stage incinerator (13 combustion stages), the temperature of the 13 combustion stages is made higher than the temperature required for burning the waste with hot air from the hot blast furnace (5), and then the waste supply port is opened. (2)
When a waste material such as a dehydrated cake of sewage sludge is inputted from the drying stage, the waste material is dried by contact with the upward gas flow in the drying stage, and then ignited and burned in the combustion stage, and the incinerated ash is discharged in the lower part of the cooling stage. While it is discharged as incineration ash from the outlet (4), part of the flue gas discharged from the flue gas outlet (3) is circulated to the combustion stage via the flue gas duct (7), and the remainder is sent to the desulfurization tower (11). After desulfurization and dust removal are carried out, a deodorizing device (
12) and is discharged from the chimney (22) in the same manner as in conventional waste incinerators. However, in the present invention, a heat exchanger 2M (16) is provided which heats the exhaust gas after desulfurization using the high temperature extracted gas extracted from the multi-stage incinerator (1) as a heating source, and the ignition of the waste is prevented. When the furnace becomes active and the temperature inside the furnace falls below the set value, the bleed air amount control valve (18) keeps the bleed air amount at a low level, so the amount of heat removed by the bleed air from the combustion stage in the furnace is minimized, and the amount of heat inside the furnace is kept to a minimum. In addition to normalizing the temperature distribution of the heat exchanger (16
) is also supplied with the minimum amount of heat required to heat the exhaust gas, and can heat the exhaust gas to the temperature required to deodorize it without requiring a large amount of external heating. Conversely, when the waste is well ignited and the temperature inside the furnace rises above the set value, the bleed air amount control valve (18)
The opening is increased to remove a larger amount of heat from the combustion stage in order to normalize the temperature distribution in the furnace. ) is controlled based on the exhaust gas temperature near the inlet/outlet on the heated fluid flow path side. This control includes, for example, a method in which the amount of extracted air is controlled so that the difference between a preset reference outlet temperature or a reference outlet temperature and the temperature detected at the outlet or inlet of the heat exchanger (16) approaches zero; Various control methods can be adopted, such as a method that brings the difference between the inlet temperature and outlet temperature of the exchanger (16) close to a set value. Since the amount of extracted air is controlled to keep the temperature constant based on the temperature, the temperature inside the exhaust gas treatment device will not become unstable due to the high temperature exhaust gas being extracted into the exhaust gas treatment device.
When viewed as a whole system, it is possible to perform stable exhaust gas treatment while minimizing energy waste.
なお、以上の説明では抽気量制御弁（１８）は単一のも
のとしたが、図示のように各段の抽気ダクトに個別に油
気量制御弁（１８ａ）を設けてもよく、また、抽気を最
高温度の燃焼段から行うようにしてもよい。更にまた、
図示の実施例では温度計（２０）を乾燥段に設置し、最
高温度域の上昇を乾燥段の温度上昇により検出するよう
にしたが、温度計（２Ｏ）を冷却段に設置し、最高温度
域の上昇を冷却段の温度低下により検出する方式として
もよく、あるいは全段に温度計（２０）を配置してもよ
いことは勿論である。Note that in the above description, the bleed air amount control valve (18) is a single one, but as shown in the figure, each stage of the bleed air duct may be provided with an oil amount control valve (18a) individually. Air extraction may be performed from the combustion stage with the highest temperature. Furthermore,
In the illustrated embodiment, a thermometer (20) is installed in the drying stage, and an increase in the maximum temperature range is detected by the temperature rise in the drying stage. It goes without saying that a method may be adopted in which a rise in temperature is detected by a decrease in the temperature of the cooling stages, or thermometers (20) may be arranged in all stages.
（発明の効果）
本発明は以上の説明からも明らかなように、多段焼却炉
のみならずこれに接続された排ガス処理装置の排ガス温
度をも考慮して抽気量の制御を行うようにしたものであ
るから、廃棄物焼却装置全体としての熱エネルギーの無
駄を最少限にとどめつつ安定して排ガス処理を行うこと
ができるものであり、従来のこの種の廃棄物焼却装置の
問題点を解決したものとして産業の発展に寄与するとこ
ろは極めて大である。(Effects of the Invention) As is clear from the above description, the present invention controls the amount of extracted air by taking into account not only the multistage incinerator but also the exhaust gas temperature of the exhaust gas treatment device connected to the multistage incinerator. Therefore, the waste incinerator as a whole can perform stable exhaust gas treatment while minimizing the waste of thermal energy, and solves the problems of conventional waste incinerators of this type. The contribution it makes to the development of industry is extremely large.
図面は本発明の実施例を示す配置説明図である（１）：
多段焼却炉、（１１）：脱硫塔、（１２） ：脱臭装置
、（１６） ：熱交換器、（１７） ：抽気ダクト、（
１８）；抽気量制御弁。The drawing is an explanatory layout diagram showing an embodiment of the present invention (1):
Multi-stage incinerator, (11): Desulfurization tower, (12): Deodorizing device, (16): Heat exchanger, (17): Bleeding duct, (
18); Bleed air amount control valve.
Claims (1)
加熱する熱交換器（１６）と脱臭装置（１２）とを接続
し、該熱交換器（１６）の加熱流体供給口には多段焼却
炉（１）から燃焼ガスを抽気する抽気ダクト（１７）を
接続するとともに、該抽気ダクト（１７）には炉内温度
が設定温度よりも下降したとき抽気量を低水準に保ち、
炉内温度が設定温度よりも上昇したときには前記熱交換
器（１６）の出入口付近の排ガス温度に基き抽気量を制
御する抽気量制御弁（１８）を設けたことを特徴とする
廃棄物焼却装置。A desulfurization tower (11), a heat exchanger (16) for heating the flue gas after desulfurization, and a deodorizing device (12) are connected to the multistage incinerator (1), and a heated fluid supply port of the heat exchanger (16) is connected to the desulfurization tower (11). is connected to a bleed air duct (17) for extracting combustion gas from the multistage incinerator (1), and the bleed air duct (17) is connected to a bleed air duct (17) that maintains the amount of bleed air at a low level when the temperature inside the furnace falls below a set temperature.
A waste incineration device characterized by being provided with a bleed air amount control valve (18) that controls the amount of bleed air based on the exhaust gas temperature near the entrance and exit of the heat exchanger (16) when the temperature inside the furnace rises above a set temperature. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59170799A JPS6149920A (en) | 1984-08-16 | 1984-08-16 | Waste incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59170799A JPS6149920A (en) | 1984-08-16 | 1984-08-16 | Waste incinerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6149920A true JPS6149920A (en) | 1986-03-12 |
| JPH0154605B2 JPH0154605B2 (en) | 1989-11-20 |
Family
ID=15911563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59170799A Granted JPS6149920A (en) | 1984-08-16 | 1984-08-16 | Waste incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6149920A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7072082B2 (en) | 2000-03-31 | 2006-07-04 | Canon Kabushiki Kaisha | Image reading apparatus and image forming apparatus |
-
1984
- 1984-08-16 JP JP59170799A patent/JPS6149920A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7072082B2 (en) | 2000-03-31 | 2006-07-04 | Canon Kabushiki Kaisha | Image reading apparatus and image forming apparatus |
| US7391544B2 (en) | 2000-03-31 | 2008-06-24 | Canon Kabushiki Kaisha | Image reading apparatus and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0154605B2 (en) | 1989-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |