JPS634835A - Wet type stack gas desulfurization facility with built-in heat exchanger for exhaust heat recovery - Google Patents

Wet type stack gas desulfurization facility with built-in heat exchanger for exhaust heat recovery

Info

Publication number
JPS634835A
JPS634835A JP61146233A JP14623386A JPS634835A JP S634835 A JPS634835 A JP S634835A JP 61146233 A JP61146233 A JP 61146233A JP 14623386 A JP14623386 A JP 14623386A JP S634835 A JPS634835 A JP S634835A
Authority
JP
Japan
Prior art keywords
exhaust gas
heat exchanger
water
gas
primary heat
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
Application number
JP61146233A
Other languages
Japanese (ja)
Inventor
Yoichi Mori
洋一 森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP61146233A priority Critical patent/JPS634835A/en
Publication of JPS634835A publication Critical patent/JPS634835A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To efficiently recover the latent heat in a exhaust gas by providing with a gas absorbing device sprinkling an absorbing liquid and a secondary heat exchanger which the exhaust gas cleaned through the absorbing device by the high temp. cooling water discharged from a primary heat exchanger. CONSTITUTION:The exhaust gas generated by a boiler, etc., is introduced to the facility from an exhaust gas inlet 1, and cooled to below the dew point by the primary heat exchanger 2 where the water vapor is condensed on the surface of heat transfer pipes. A neutralizing absorbent is supplied to the water storaged in the lower part of a water tank 3 from a chemical liquid storage tank 7 by a pump 8, and the water containing the neutralizing absorbent is sent to the stack gas desulfurization facility by a pump 9 to wash the exhaust gas. The washed exhaust gas passes through the secondary heat exchanger 10 to which the hot water discharged from the outlet of the primary heat exchanger 2 is supplied, and heated to be a dried gas, which is discharged from a exhaust gas outlet 11 to the outside of the system.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は排熱回収用熱交換器を内蔵する湿式排煙脱硫装
置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wet flue gas desulfurization device incorporating a heat exchanger for exhaust heat recovery.

〔従来の技術〕[Conventional technology]

従来の湿式排煙脱硫装置においては、装置へ入ってくる
排ガスの保有する熱量は、排ガス中の公害源を補集する
ために、ガス中へ投入される処理水の蒸発熱となり、大
気中へ放出されるためにすべて損失となる。
In conventional wet flue gas desulfurization equipment, the amount of heat held by the flue gas entering the equipment becomes the heat of evaporation of the treated water that is injected into the gas in order to collect pollution sources in the flue gas, and is released into the atmosphere. Everything is lost because it is released.

又、蒸発した水分は排煙脱硫装置以降のダクト、誘引通
風機、煙突などの中で、外気により排ガスが更に冷却さ
れる事により、気相状態から再度、液相状態に戻り、ダ
クト、誘引通風機、煙突などを腐蝕する原因となるのみ
ならず、煙突頂部から白煙を生じて観察者をして、公害
防止の対策を行ったために生ずる白煙であるにもかかわ
らず、不必要な不安感を与える元となっている。
In addition, the evaporated water returns from the gas phase to the liquid phase again as the exhaust gas is further cooled by outside air in the ducts, induced draft fans, chimneys, etc. after the flue gas desulfurization equipment, and is returned to the liquid phase from the gas phase. Not only does it cause corrosion of ventilators, chimneys, etc., but white smoke is generated from the top of the chimney and becomes an unnecessary source of smoke, even though it is caused by pollution prevention measures. It is a source of anxiety.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明は下記問題点を解決した湿式排煙脱硫装置を提供
しようとするものである。
The present invention aims to provide a wet flue gas desulfurization device that solves the following problems.

(1)  排煙脱硫装置入口における排ガス中に残留す
る熱エネルギ、特に従来回収が困難であった、排ガス中
に含まれる燃料の燃焼によって発生した水蒸気の保有す
る潜熱を積極的に回収する。
(1) Actively recover the thermal energy remaining in the exhaust gas at the inlet of the flue gas desulfurization equipment, especially the latent heat possessed by the water vapor generated by combustion of the fuel contained in the exhaust gas, which has been difficult to recover in the past.

(2)  排煙脱硫装置出口排ガスを乾きガスとし、後
光側に設置される各機器の腐食及び煙突頂部からの白煙
の発生を減少させる。
(2) The exhaust gas at the exit of the flue gas desulfurization equipment is changed to dry gas to reduce corrosion of equipment installed on the halo side and the generation of white smoke from the top of the chimney.

(3)−般の排煙脱硫装置では、排ガス中に蒸発して行
く水損失のため、装置へ大量の水を供給する必要がある
が、本発明では水消費量をゼロ又は必要最少限に低減す
る。
(3) - In general flue gas desulfurization equipment, it is necessary to supply a large amount of water to the equipment due to water loss that evaporates into the exhaust gas, but with the present invention, water consumption can be reduced to zero or to the minimum necessary. reduce

〔問題点を解決するための手段〕[Means for solving problems]

本発明は排ガスを導入して排ガス中の水蒸気を凝縮させ
る一次熱交換器と、該−火熱交換器で冷却された排ガス
に、前記凝縮水に薬液を添加した吸収液を散布するガス
吸収装置と、該吸収装置で浄化された排ガスを、−火熱
交換器から排出された高温の冷却水で加熱する二次熱交
換器とを有することを特徴とする湿式排煙脱硫装置であ
る。
The present invention includes a primary heat exchanger that introduces exhaust gas and condenses water vapor in the exhaust gas, and a gas absorption device that sprays an absorption liquid obtained by adding a chemical to the condensed water to the exhaust gas cooled by the fire heat exchanger. A wet flue gas desulfurization device is characterized in that it has a secondary heat exchanger that heats the exhaust gas purified by the absorption device with high-temperature cooling water discharged from the fire heat exchanger.

〔作用〕[Effect]

(1)排煙脱硫装置に入って来る排ガスを、従来の散水
による冷却に換えて防蝕を施し、内部に低温水を通じた
熱交換器を排煙脱硫装置の内部に組み込み、同熱交換器
により排ガスを露点以下の温度まで冷却する。
(1) Instead of cooling the exhaust gas that enters the flue gas desulfurization equipment using conventional water spraying, we provide corrosion protection and incorporate a heat exchanger that passes low-temperature water inside the flue gas desulfurization equipment. Cools the exhaust gas to a temperature below the dew point.

排ガスは保有する顕熱に加えて、同ガス中に保有してい
た水蒸気の持つ潜熱も熱交換器管表面に放出し、間管の
表面に水蒸気凝縮水を発生させる。ガス中に存在する公
害源物質たとえばEIO,、So、などの−部は同凝縮
水中に吸収されるが、本装置ではさらに公害源物質を中
和吸収させるための薬品たとえばNaOH。
In addition to the sensible heat possessed by the exhaust gas, the latent heat possessed by the water vapor contained in the exhaust gas is also released onto the surface of the heat exchanger tubes, generating water vapor condensed on the surface of the intermediate tubes. Parts of pollution-causing substances such as EIO, So, etc. present in the gas are absorbed into the condensed water, but in this device, a chemical such as NaOH is further added to neutralize and absorb the pollution-causing substances.

Mg(OH)tなどを添加した水で排ガスを洗滌する。Wash the exhaust gas with water to which Mg(OH)t etc. have been added.

(2)洗滌された低温度、低公害の排ガスを、前記(1
)の段階で排脱入口排ガスによって加熱され温度が上昇
した水によって加熱し、乾燥排ガスとして後流側へみち
びく。
(2) The cleaned low-temperature, low-pollution exhaust gas is
), the water is heated by the exhaust gas at the exhaust/desorption inlet and the temperature rises, leading to the downstream side as dry exhaust gas.

(3)本装置内では排ガス中の水蒸気を凝縮水として取
り出し排ガスは乾きガスとして放出するので、装置内の
滞留水量は常に増加し、増加分を系外にオーバフローさ
せる事によって補給水なしで運転できる。
(3) In this device, the water vapor in the exhaust gas is extracted as condensed water and the exhaust gas is released as dry gas, so the amount of accumulated water in the device constantly increases, and by overflowing the increased amount to the outside of the system, it can be operated without make-up water. can.

〔実施例〕〔Example〕

第1図に本発明の1つの実施例の系統図を示す。 FIG. 1 shows a system diagram of one embodiment of the present invention.

系統図中に示した温度は、実施例の理解を助ける′ため
に一例を示したもので本発明に必然的な温度ではない。
The temperatures shown in the system diagram are shown as an example to aid understanding of the embodiments, and are not necessarily temperatures for the present invention.

ボイラなどの燃焼装置を有する設備から発生した排ガス
は本装置の排ガス人口1よシ装置内へ導入される。
Exhaust gas generated from equipment having a combustion device such as a boiler is introduced into the exhaust gas system of this device.

排ガスは一次熱交換器2により冷却され露点温度以下と
なり、−火熱交換器2の伝熱管表面にはガス中の水蒸気
が凝縮する。凝縮水は水槽3に貯まり、水面が一定レベ
ルよシ高くなるとオーバフロー管4よシ系外に排出され
る。
The exhaust gas is cooled down to a temperature below the dew point by the primary heat exchanger 2, and water vapor in the gas condenses on the surface of the heat exchanger tube of the fire heat exchanger 2. Condensed water is stored in a water tank 3, and when the water surface rises above a certain level, it is discharged out of the system through an overflow pipe 4.

水槽に貯まった凝縮水は一次循環ポンプ5にて曝気槽6
へ送り、低酸素状態の排ガスと接触 ・し、低酸素とな
っている水に空気中から酸素を補給する。
The condensed water accumulated in the water tank is passed through the primary circulation pump 5 to the aeration tank 6.
The water is sent to the water and comes into contact with the low-oxygen exhaust gas, supplying oxygen from the air to the low-oxygen water.

同槽下部に貯った水に対して薬液貯槽7から薬液注入ポ
ンプ8に依って中和吸収剤を供給した後、二次循環水ポ
ンプ9により、中和吸収剤を含有せる水を排煙脱硫装置
へ送り、排ガスを洗滌する。
After supplying the neutralized absorbent from the chemical storage tank 7 to the water stored in the lower part of the tank by the chemical injection pump 8, the water containing the neutralized absorbent is pumped out by the secondary circulation water pump 9. Send to desulfurization equipment to clean exhaust gas.

洗滌された排ガスは高温度となった一次熱交換器出口2
の水を供給された二次熱交換器10中を通過して加熱て
れ乾きガスとなって排ガス出口11から系外へ排出する
The washed exhaust gas reaches the high temperature primary heat exchanger outlet 2.
The gas passes through the secondary heat exchanger 10 supplied with water, becomes heated and becomes dry gas, and is discharged from the exhaust gas outlet 11 to the outside of the system.

二次熱交換器出口10の水は排ガス中の熱を吸収する事
によって高温度に達しており、15から系外に取り出し
ボイラ給水等に使用して、当該プラントの熱経済に資す
る事が出来る。
The water at the secondary heat exchanger outlet 10 reaches a high temperature by absorbing the heat in the exhaust gas, and can be taken out of the system from 15 and used for boiler water supply, etc., contributing to the heat economy of the plant. .

〔発明の効果〕〔Effect of the invention〕

本発明は、上記構成を採用することにより、排ガス中の
水蒸気を凝縮して回収し、吸収液として利用するととも
に、凝縮時の潜熱を回収して浄化後の乾燥排ガスを加熱
し、大気放出を容易にした。このことは、比較的低温に
おけるガス吸収を可能とし、その結果高度の脱硫性能を
確保し、系外からの吸収水の供給を不用、若しくは最少
限となし、ボイラの熱効率を飛躍的に向上させた(約7
チ向上)。また、一次熱交換器で、除湿がなされ、吸収
装置で低温吸収が可能となったことにより、その後の排
ガス流路を乾き排ガスが流れることになり、該流路を構
成する装置の腐食が抑止された。
By adopting the above configuration, the present invention condenses and recovers the water vapor in the exhaust gas and uses it as an absorption liquid, and also recovers the latent heat at the time of condensation to heat the purified dry exhaust gas and prevent it from being released into the atmosphere. Made it easy. This makes it possible to absorb gas at relatively low temperatures, thereby ensuring high desulfurization performance, eliminating the need for supplying absorbed water from outside the system, or minimizing it, and dramatically improving the thermal efficiency of the boiler. (about 7
improvement). In addition, since dehumidification is performed in the primary heat exchanger and low-temperature absorption is enabled in the absorption device, dry exhaust gas flows through the subsequent exhaust gas flow path, which prevents corrosion of the equipment that makes up the flow path. It was done.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の1実施例である排煙脱硫装置の系統図
である。 復代理人  内 1)  明 復代理人  萩 原 亮 − 復代理人  安 西 篤 夫 第1図
FIG. 1 is a system diagram of a flue gas desulfurization apparatus which is an embodiment of the present invention. Sub-Agents 1) Meifuku Agent Ryo Hagiwara - Sub-Agent Atsuo Anzai Figure 1

Claims (1)

【特許請求の範囲】[Claims] 排ガスを導入して排ガス中の水蒸気を凝縮させる一次熱
交換器と、該一次熱交換器で冷却された排ガスに、前記
凝縮水に薬液を添加した吸収液を散布するガス吸収装置
と、該吸収装置で浄化された排ガスを、一次熱交換器か
ら排出された高温の冷却水で加熱する二次熱交換器とを
有することを特徴とする湿式排煙脱硫装置。
a primary heat exchanger that introduces exhaust gas and condenses water vapor in the exhaust gas; a gas absorption device that sprays an absorption liquid obtained by adding a chemical to the condensed water to the exhaust gas cooled by the primary heat exchanger; A wet flue gas desulfurization device comprising: a secondary heat exchanger that heats exhaust gas purified by the device with high temperature cooling water discharged from the primary heat exchanger.
JP61146233A 1986-06-24 1986-06-24 Wet type stack gas desulfurization facility with built-in heat exchanger for exhaust heat recovery Pending JPS634835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61146233A JPS634835A (en) 1986-06-24 1986-06-24 Wet type stack gas desulfurization facility with built-in heat exchanger for exhaust heat recovery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61146233A JPS634835A (en) 1986-06-24 1986-06-24 Wet type stack gas desulfurization facility with built-in heat exchanger for exhaust heat recovery

Publications (1)

Publication Number Publication Date
JPS634835A true JPS634835A (en) 1988-01-09

Family

ID=15403117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61146233A Pending JPS634835A (en) 1986-06-24 1986-06-24 Wet type stack gas desulfurization facility with built-in heat exchanger for exhaust heat recovery

Country Status (1)

Country Link
JP (1) JPS634835A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04313610A (en) * 1991-04-12 1992-11-05 Hitachi Zosen Corp Method for incinerating trash
EP0768108A1 (en) * 1995-10-13 1997-04-16 Mitsubishi Jukogyo Kabushiki Kaisha Boiler flue gas desulfuriser with heat recovery means
KR20010064951A (en) * 1999-12-20 2001-07-11 강신탁 Removal method and device of bad gas with dry in a organic waste matter
EP1250949A1 (en) * 2001-04-12 2002-10-23 Scheuch GmbH Process and device for recovering latent and sensible heat from exhaust gases
US10253973B2 (en) 2010-01-18 2019-04-09 General Electric Technology Gmbh System for combined flue gas heat recovery and dust precipitation improvement as retrofit solution for existing coal-fired power stations

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04313610A (en) * 1991-04-12 1992-11-05 Hitachi Zosen Corp Method for incinerating trash
EP0768108A1 (en) * 1995-10-13 1997-04-16 Mitsubishi Jukogyo Kabushiki Kaisha Boiler flue gas desulfuriser with heat recovery means
US5878675A (en) * 1995-10-13 1999-03-09 Mitsubishi Jukogyo Kabushiki Kaisha Flue gas desulfurizer, boiler equipment and thermal electric power generation equipment
KR20010064951A (en) * 1999-12-20 2001-07-11 강신탁 Removal method and device of bad gas with dry in a organic waste matter
EP1250949A1 (en) * 2001-04-12 2002-10-23 Scheuch GmbH Process and device for recovering latent and sensible heat from exhaust gases
US10253973B2 (en) 2010-01-18 2019-04-09 General Electric Technology Gmbh System for combined flue gas heat recovery and dust precipitation improvement as retrofit solution for existing coal-fired power stations

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