JPH08121703A - Waste heat recovery apparatus - Google Patents
Waste heat recovery apparatusInfo
- Publication number
- JPH08121703A JPH08121703A JP6258030A JP25803094A JPH08121703A JP H08121703 A JPH08121703 A JP H08121703A JP 6258030 A JP6258030 A JP 6258030A JP 25803094 A JP25803094 A JP 25803094A JP H08121703 A JPH08121703 A JP H08121703A
- Authority
- JP
- Japan
- Prior art keywords
- boiler
- exhaust gas
- heat exchanger
- water
- pipe
- 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
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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は火力発電所のボイラに適
用される排熱回収装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat recovery device applied to a boiler of a thermal power plant.
【０００２】[0002]
【従来の技術】図２は従来のボイラに適用される排熱回
収装置の全体系統図である。図において、バーナ１にて
ボイラ火炉２に投入された燃料は燃焼用空気ダクト３か
ら投入された空気と混合し、火炉２内で高温燃焼ガスを
生成する。高温の燃焼ガスは、火炉壁４や対流伝熱部に
設置した過熱管５や再熱器６及び節炭器７で熱回収さ
れ、一般的には節炭器出口部８で約３５０℃程度の排ガ
ス温度となっている。なお、９は蒸気ドラムでボイラ缶
水はこの蒸気ドラム９より降水管１０、循環ポンプ１１
を経由し、火炉壁４へ導入され、再び蒸気ドラム９へ戻
る。2. Description of the Related Art FIG. 2 is an overall system diagram of an exhaust heat recovery apparatus applied to a conventional boiler. In the figure, the fuel introduced into the boiler furnace 2 by the burner 1 mixes with the air introduced from the combustion air duct 3 to generate high temperature combustion gas in the furnace 2. The high temperature combustion gas is recovered by the superheater pipe 5, the reheater 6 and the economizer 7 installed in the furnace wall 4 and the convection heat transfer section, and generally about 350 ° C. at the economizer outlet 8. Exhaust gas temperature. In addition, 9 is a steam drum, and boiler can water from this steam drum 9 is a downcomer pipe 10 and a circulation pump 11.
Is introduced into the furnace wall 4 via the, and returns to the steam drum 9 again.
【０００３】その後、約１５０〜１２０℃程度迄の排ガ
スとするための熱回収装置とし、燃焼用空気ダクト３の
燃焼用空気を加温する再生式空気予熱器３０が設置され
ている。燃焼ガス中には、燃焼中の硫黄分から生成され
るＳＯ2 ガスが含有されており、排ガス中の水分、濃度
などにも依るが、１３０〜１４０℃以下の雰囲気では、
結露し腐食性の強い、硫酸を生成し、熱回収装置の低温
部で発生する所謂低温腐食を引き起こすことが知られて
いるが、この対策として、再生式空気予熱器３０の入力
空気温度を蒸気式空気予熱器３１で加温し、防止を計っ
ている。After that, a regenerative air preheater 30 for heating the combustion air in the combustion air duct 3 is installed as a heat recovery device for converting exhaust gas up to about 150 to 120 ° C. The combustion gas contains SO 2 gas produced from the sulfur content during combustion, and depending on the water content, concentration, etc. in the exhaust gas, in an atmosphere of 130 to 140 ° C. or lower,
It is known that sulfuric acid is generated due to dew condensation and is highly corrosive and causes so-called low temperature corrosion that occurs in the low temperature part of the heat recovery device. As a countermeasure against this, the input air temperature of the regenerative air preheater 30 is changed to steam. It is heated by the air preheater 31 to prevent it.
【０００４】又、再生式空気予熱器３０は、蓄熱体のエ
レメントが周囲に取付けられ、加熱されたエレメントを
ロータで回転し、排ガス側の熱を空気側に移動して熱回
収する構造となっているが、燃焼空気側が排ガス側より
高圧のため、燃焼空気の一部が排ガス側へ洩漏すること
となり、その損失は一般的にボイラ効率で約０．２％程
度の値となっている。Further, the regenerative air preheater 30 has a structure in which the elements of the heat storage body are attached to the periphery thereof, the heated element is rotated by the rotor, and the heat on the exhaust gas side is moved to the air side to recover the heat. However, since the combustion air side has a higher pressure than the exhaust gas side, part of the combustion air leaks to the exhaust gas side, and the loss is generally about 0.2% in boiler efficiency.
【０００５】[0005]
【発明が解決しようとする課題】火力発電所に設置され
るボイラの排ガス回収用に一般に広く採用されている再
生式空気予熱器は、図２に示すようにガス低温側に設置
されるためにボイラ排ガス中に含有されるＳＯ2 の結露
による腐食の問題があり、空気予熱器低温部の材質に耐
食鋼を採用し、さらに非加熱媒体の低温側温度を、例え
ば、図２に示すように蒸気式空気予熱器３１などを使用
し故意に上げ、低温側金属表面の温度を極力高めるよう
なシステムが一般的に採用されている。このような装置
に於いては次のような問題点がある。Since the regenerative air preheater generally widely used for recovering the exhaust gas of the boiler installed in the thermal power plant is installed on the low temperature side of the gas as shown in FIG. There is a problem of corrosion due to the condensation of SO 2 contained in the boiler exhaust gas. Corrosion resistant steel is adopted as the material of the low temperature part of the air preheater, and the low temperature side temperature of the non-heating medium is, for example, as shown in FIG. In general, a system is used that intentionally raises the temperature of the metal surface on the low temperature side by using a steam type air preheater 31, etc. In such a device, there are the following problems.
【０００６】（１）再生式空気予熱器の空気側より排ガ
ス側への洩漏空気による効率の低下をきたす。(1) Leakage air from the air side of the regenerative air preheater to the exhaust gas side causes a decrease in efficiency.
【０００７】（２）蒸気式空気予熱器が必要となる。(2) A steam type air preheater is required.
【０００８】[0008]
【課題を解決するための手段】本発明はこのような課題
を解決するためにボイラの空気ダクト側と排ガスダクト
側の熱交換器にボイラ缶水循環系統より分岐した配管に
より熱媒体としてボイラ缶水を通し、空気ダクト側熱交
換器で燃焼用空気と熱交換させ、排ガスダクト側熱交換
器で排熱回収をし、このボイラ缶水をボイラ缶水循環系
に戻す構成とする。又、この構成に、空気ダクト側熱交
換器と並列に設置した熱交換器を設けて他の熱源とする
構成、排ガスダクト側熱交換器の熱媒体入口には空気ダ
クト側熱交換器をパイパスする配管を設ける構成、更
に、排ガスダクト側に蒸発器を設ける構成も提供する。In order to solve such a problem, the present invention uses a boiler can water as a heat medium as a heat medium by a pipe branched from a boiler can water circulation system to a heat exchanger on the air duct side and the exhaust gas duct side of the boiler. Through the air duct side heat exchanger to exchange heat with the combustion air, the exhaust gas duct side heat exchanger recovers exhaust heat, and returns the boiler can water to the boiler can water circulation system. Further, in this configuration, a heat exchanger installed in parallel with the air duct side heat exchanger is provided as another heat source, and the air duct side heat exchanger is bypassed to the heat medium inlet of the exhaust gas duct side heat exchanger. There is also provided a configuration for providing a piping for the above, and a configuration for providing an evaporator on the exhaust gas duct side.
【０００９】即ち、本発明は、（１）ボイラ空気ダクト
内に設置され、ボイラ缶水循環系統から分岐した配管に
よりボイラ缶水を熱媒体として通し、燃焼用空気と熱交
換する空気ダクト側熱交換器と、ボイラ排ガスダクト内
に設置され、前記空気ダクト側熱交換器からボイラ缶水
を受け、排ガスから排熱を回収する排ガスダクト側熱交
換器と、同排ガスダクト側熱交換器からボイラ排ガスで
加温されたボイラ缶水を受け、同ボイラ缶水を前記ボイ
ラ循環系統のドラムへ戻す出口連絡管と、前記ボイラ缶
水循環系統から分岐した配管の途中に設けられ、前記出
口連絡管の前記ドラムへ戻される缶水温度を検出し、ボ
イラ缶水の分岐量を調整する制御弁とを具備してなるこ
とを特徴とする排熱回収装置を提供する。That is, the present invention is as follows: (1) Air duct side heat exchange for exchanging heat with combustion air by passing boiler can water as a heat medium through a pipe branched from a boiler can water circulation system. And an exhaust gas duct side heat exchanger that is installed in the boiler exhaust gas duct, receives boiler can water from the air duct side heat exchanger, and recovers exhaust heat from the exhaust gas, and the exhaust gas duct side heat exchanger from the boiler exhaust gas Receiving boiler can water heated by, the outlet connection pipe for returning the boiler can water to the drum of the boiler circulation system, provided in the middle of the pipe branched from the boiler can water circulation system, the outlet connection pipe of the There is provided an exhaust heat recovery device comprising: a control valve that detects a temperature of can water returned to a drum and adjusts a branch amount of boiler can water.
【００１０】又、（２）の発明として、前述の（１）に
おいて、前記ボイラ缶水循環系統より分岐した配管には
分岐配管により前記空気ダクト側熱交換器と並列に設置
した熱交換器を設け、同熱交換器へのボイラ缶水の分岐
量は同熱交換器の加熱側流体出口温度を検出して調整
し、重油加熱器、地域暖房用等その他の熱源として使用
可能であることを特徴とする排熱回収装置を提供する。Further, as the invention of (2), in the above-mentioned (1), the pipe branched from the boiler can water circulation system is provided with a heat exchanger installed in parallel with the air duct side heat exchanger by a branch pipe. The branching amount of boiler boiler water to the same heat exchanger can be adjusted by detecting the heating side fluid outlet temperature of the same heat exchanger and used as other heat source for heavy oil heater, district heating, etc. An exhaust heat recovery device is provided.
【００１１】又、（３）の発明として、前述の（１）又
は（２）において、前記排ガスダクト側熱交換器の熱媒
体入口へは硫酸腐食などの低温腐食対策として前記ボイ
ラ缶水循環系統より分岐した配管から前記空気ダクト側
熱交換器をパイパスする配管を接続したことを特徴とす
る排熱回収装置を提供する。Further, as the invention of (3), in the above (1) or (2), the heat transfer medium inlet of the exhaust gas duct side heat exchanger is connected to the boiler can water circulation system as a countermeasure against low temperature corrosion such as sulfuric acid corrosion. There is provided an exhaust heat recovery device characterized in that a pipe that bypasses the air duct side heat exchanger is connected from a branched pipe.
【００１２】更に、（４）の発明として、前述の（１）
〜（３）のいずれかにおいて、前記排ガスダクト側熱交
換器を蒸発器とすることを特徴とする排熱回収装置も提
供する。Further, as the invention of (4), the above (1)
In any one of (3) to (3), there is also provided an exhaust heat recovery device characterized in that the exhaust gas duct side heat exchanger is an evaporator.
【００１３】[0013]
【作用】本発明はこのような手段により、その（１）の
発明においては、ボイラ缶水循環系統から分岐したボイ
ラ缶水は空気ダクト内に設置した熱交換器にて燃焼用空
気と熱交換させた後、ボイラ排ガスダクト内に設置した
熱交換器に通し、排熱を回収させる。ボイラ排ガスで加
温されたこのボイラ缶水は、その後ボイラ循環系統のド
ラムへ戻される。ボイラ缶水循環系統から分岐して空気
ダクト側熱交換器へ流入するボイラ缶水の量は、排ガス
ダクト側の戻し用配管の入口でボイラ缶水の出口温度を
検出し、排ガスの温度が低温腐食を起こさない程度の温
度となるように制御弁で調整される。従って、従来のよ
うに再生式空気予熱器を採用しないため、洩漏空気によ
るボイラ効率の低下が防止でき、蒸気式空気予熱器も不
要である。又、ボイラ缶水を熱媒体として使用するので
配置的に離れた位置にある他熱源との熱交換も可能であ
る。In the invention of (1), the boiler can water branched from the boiler can water circulation system is exchanged with the combustion air by the heat exchanger installed in the air duct. After that, it is passed through a heat exchanger installed in the boiler exhaust gas duct to recover the exhaust heat. This boiler can water heated by the boiler exhaust gas is then returned to the drum of the boiler circulation system. The amount of boiler can water that branches from the boiler can water circulation system and flows into the air duct side heat exchanger detects the boiler can water outlet temperature at the inlet of the return pipe on the exhaust gas duct side, and the temperature of the exhaust gas is low temperature corrosion. It is adjusted by the control valve so that the temperature does not occur. Therefore, unlike the conventional case, since the regenerative air preheater is not used, it is possible to prevent a decrease in boiler efficiency due to leaked air, and the steam air preheater is not necessary. Further, since boiler boiler water is used as a heat medium, heat exchange with another heat source located at a distant position is possible.
【００１４】（２）の発明においては、前述と同様の作
用、効果を奏すると共に、更に、燃焼用空気の加温と並
行して、他の熱媒体との熱交換、例えば、重油加熱器、
地域暖房用等設置し、これ等の熱源としても使用可能と
なる。この場合も熱媒体は配管で熱移動可能であるので
配置上の制約は少ない。In the invention of (2), the same operation and effect as described above are exhibited, and, in addition to the heating of the combustion air, heat exchange with another heat medium is carried out, for example, a heavy oil heater,
Installed for district heating, etc., it can also be used as a heat source for these. Also in this case, since the heat medium can transfer heat through the pipe, there are few restrictions on the arrangement.
【００１５】（３）の発明においては、前述と同様の作
用、効果を奏すると共に、これらに加え、空気予熱器の
熱媒体の１部をパイパスさせることにより、排ガスダク
ト側熱交換器入口熱媒体温度を調整できるので硫酸等の
露点温度以上とすることにより低温腐食を確実に防止出
来る。In the invention of (3), in addition to the same actions and effects as described above, in addition to these, by bypassing a part of the heat medium of the air preheater, the heat medium at the inlet of the exhaust gas duct side heat exchanger is introduced. Since the temperature can be adjusted, low temperature corrosion can be reliably prevented by setting the temperature above the dew point of sulfuric acid or the like.
【００１６】（４）の発明においては、前述の作用、効
果に加えて、ボイラ排ガスダクト内に設置する熱交換器
を蒸発器とすることにより、ボイラ火炉を小さく設計す
ることが可能である。In the invention of (4), in addition to the above-described actions and effects, the boiler furnace can be designed small by using the heat exchanger installed in the boiler exhaust gas duct as an evaporator.
【００１７】[0017]
【実施例】以下、本発明の実施例を図面に基づいて具体
的に説明する。図１は本発明の一実施例に係る排熱回収
装置の全体の系統図である。図において、符号１乃至１
１は図２に示す従来のものと同じ機能を有するので同一
の符号を付し、そのまま引用して説明するが、本発明の
特徴となるところは符号１２乃至２２の構成にある。以
下、これらについて詳しく説明する。Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall system diagram of an exhaust heat recovery apparatus according to an embodiment of the present invention. In the figure, reference numerals 1 to 1
Since 1 has the same function as the conventional one shown in FIG. 2, the same reference numerals are given and the description will be made by directly quoting it. These will be described in detail below.
【００１８】図において、１２は分岐した配管、１３は
制御弁、１４はボイラ缶水を熱媒体とする空気予熱器、
１５も同じくボイラ缶水を熱媒体とする排ガスクーラ、
１６はボイラ缶水の出口連絡管、１７はボイラ缶水の分
岐配管、１８は調整弁、１９はボイラ缶水と他の媒体と
熱交換する熱交換器、２０は熱交換器１９の出口と排ガ
スクーラ１５の入口とを連通する配管、２１は分岐配
管、２２はこの分岐配管の流量の調整弁である。In the figure, 12 is a branched pipe, 13 is a control valve, 14 is an air preheater using boiler can water as a heat medium,
15 is also an exhaust gas cooler that uses boiler can water as a heat medium,
16 is an outlet communication pipe for boiler can water, 17 is a branch pipe for boiler can water, 18 is a regulating valve, 19 is a heat exchanger for exchanging heat between the boiler can water and another medium, and 20 is an outlet for the heat exchanger 19. A pipe communicating with the inlet of the exhaust gas cooler 15, 21 is a branch pipe, and 22 is a flow rate adjusting valve of this branch pipe.
【００１９】このような構成の実施例において、バーナ
１にてボイラ火炉２に投入された燃料は燃焼用空気ダク
ト３から投入された空気と混合し、火炉２内で高温燃焼
ガスを生成する。高温の燃焼ガスは、火炉壁４や対流伝
熱部に設置した過熱器５や再熱器６及び節炭器７で熱回
収され、一般的には節炭器６の出口部８で約３６０℃の
排ガス温度となっている。In the embodiment having such a structure, the fuel charged into the boiler furnace 2 by the burner 1 is mixed with the air charged from the combustion air duct 3 to generate high temperature combustion gas in the furnace 2. The high-temperature combustion gas is heat-recovered by the superheater 5, reheater 6 and economizer 7 installed in the furnace wall 4 and the convection heat transfer part, and generally about 360 ° at the exit 8 of the economizer 6. The exhaust gas temperature is ℃.
【００２０】このボイラにおいて、本発明では低温部熱
回収装置として図２に示す従来の蓄熱体がロータで回転
する再生式熱交換器３０に代えて、ボイラ缶水を熱媒体
として使用する排ガス側の熱交換器及び燃焼用空気側熱
交換器一対を設置したものである。従って熱交換器用の
熱媒体はボイラ缶水が使用される。以下、ボイラ缶水の
流れ順に従ってこれらの特徴を説明する。In this boiler, in the present invention, the conventional heat storage unit shown in FIG. 2 is replaced with the regenerative heat exchanger 30 in which the rotor rotates by the rotor as the low temperature heat recovery device, and the boiler side water is used as the heat medium on the exhaust gas side. The heat exchanger and the pair of air side heat exchangers for combustion are installed. Therefore, boiler can water is used as the heat medium for the heat exchanger. Hereinafter, these features will be described according to the flow order of boiler can water.
【００２１】ボイラ缶水は蒸気ドラム９から降水管１
０、循環ポンプ１１を経由し、火炉壁４へと導入され、
再び空気ドラム９へ循環されている。熱交換器用熱媒体
としてのボイラ缶水は、循環ポンプ１１出口部より分岐
する配管１２で分岐され、熱媒体出口の缶水温度を所定
温度に制御するための制御弁１３を通って燃焼用空気と
熱媒体との熱交換を行なう空気予熱器１４を通過する。
この制御弁１３の制御は排ガスクーラ１５の熱媒体出口
温度を検出し、所定の温度になるように弁１３の流量を
決定する。Boiler can water is supplied from the steam drum 9 to the downcomer pipe 1.
0, introduced into the furnace wall 4 via the circulation pump 11,
It is circulated to the air drum 9 again. Boiler can water as a heat medium for the heat exchanger is branched by a pipe 12 which branches from the outlet of the circulation pump 11, and passes through a control valve 13 for controlling the can water temperature at the heat medium outlet to a predetermined temperature for combustion air. And an air preheater 14 that exchanges heat with the heat medium.
The control of the control valve 13 detects the heat medium outlet temperature of the exhaust gas cooler 15 and determines the flow rate of the valve 13 so as to reach a predetermined temperature.
【００２２】空気予熱器１４を熱媒体が通過すると媒体
は燃焼用空気を加温して冷却され、冷却された熱媒体は
節炭器出口部８に設置された排ガスクーラ１５で排熱回
収を行いながら所定温度迄再加温され、出口連絡管１６
を介して蒸気ドラム９へ循環する系統を構成している。When the heat medium passes through the air preheater 14, the medium heats the combustion air to cool it, and the cooled heat medium is recovered by the exhaust gas cooler 15 installed at the outlet 8 of the economizer. While being performed, it is reheated to a predetermined temperature, and the outlet connecting pipe 16
A system is circulated to the steam drum 9 via the.
【００２３】又、分岐配管１７で熱媒体の１部を配管１
２より分岐して、ボイラ缶水以外の他の媒体と熱交換す
る熱交換器１９を通し、配管２０を経由して空気予熱器
１４の出口に流れ、主流と合流するように、熱交換器１
９を併設することもできる。この場合は他の加熱媒体出
口温度を検出し、調整弁１８を制御して熱交換器１９へ
の分岐量を調整するようにする。この熱交換器１９の適
用例としては、重油加熱器、地域暖房用設備、等の熱源
として使用できる。In addition, a part of the heat medium is connected to the pipe 1 by the branch pipe 17.
2 through the heat exchanger 19 for exchanging heat with a medium other than boiler can water, flow through the pipe 20 to the outlet of the air preheater 14, and merge with the main stream. 1
It is also possible to set up 9 together. In this case, another heating medium outlet temperature is detected, and the regulating valve 18 is controlled to regulate the branch amount to the heat exchanger 19. As an application example of this heat exchanger 19, it can be used as a heat source for a heavy oil heater, a facility for district heating, and the like.
【００２４】更に、排ガスクーラ１５側入口の熱媒体温
度を酸露点温度以上に保持するようにするため、分岐配
管２１とその途中に分岐量調整弁２２とを設置する方式
も適用する。この場合、調整弁２２の制御は、排ガスク
ーラ１５の入口の熱媒体温度を検出することにより行な
われる。Further, in order to keep the temperature of the heat medium at the inlet of the exhaust gas cooler 15 above the acid dew point temperature, a system in which a branch pipe 21 and a branch amount adjusting valve 22 are installed in the middle thereof is also applied. In this case, the adjustment valve 22 is controlled by detecting the temperature of the heat medium at the inlet of the exhaust gas cooler 15.
【００２５】なお、上記の実施例において排ガスダクト
内に設置する熱交換器を熱媒体としてボイラ缶水を用い
た排ガスクーラ１５として説明したが、この代わりに熱
交換器として蒸発器を設置して排ガスの熱を回収するよ
うにすることもでき、この場合にはボイラ火炉を小さく
設計することができるものである。Although the heat exchanger installed in the exhaust gas duct has been described as the exhaust gas cooler 15 using boiler can water as the heat medium in the above embodiment, an evaporator is installed as the heat exchanger instead. It is also possible to recover the heat of the exhaust gas, in which case the boiler furnace can be designed small.
【００２６】このような排熱回収装置として次のような
効果が得られるものである。The following effects can be obtained as such an exhaust heat recovery device.
【００２７】（１）従来のように回転式空気予熱器を採
用せず、ボイラ缶水を熱媒体とするため洩漏空気量がな
く、洩漏損失が０となりボイラ効率が向上する。この値
はおよそ０．２％程度である。(1) Since the rotary air preheater is not used as in the conventional case and the boiler can water is used as the heat medium, there is no leakage air amount, and the leakage loss is 0, and the boiler efficiency is improved. This value is about 0.2%.
【００２８】（２）従来のように排ガスを更に加温する
ための蒸気式空気予熱器が不要である。(2) The steam type air preheater for further heating the exhaust gas as in the conventional case is not required.
【００２９】（３）排ガスクーラ１５の低温部の腐蝕対
策としては耐触鋼管の採用が可能であり、又、熱媒体を
１部分岐配管２１で分岐して排ガスクーラ１５の入口温
度を酸露点温度以上とし、実現することができる。(3) As a countermeasure against corrosion of the low temperature part of the exhaust gas cooler 15, a corrosion-resistant steel pipe can be adopted, and the heat medium is branched by the one-part branch pipe 21 so that the inlet temperature of the exhaust gas cooler 15 is the acid dew point. It can be realized at a temperature above the temperature.
【００３０】（４）空気予熱器１４と排ガスクーラ１５
は熱媒体を介して熱移動可能のため従来の再生回転式空
気予熱器３０の如く、同一場所に必ずしも配置する必要
なく、風道、煙道の配置が最適に設計出来る。(4) Air preheater 14 and exhaust gas cooler 15
Since heat can be transferred through the heat medium, it is not always necessary to arrange them in the same place as in the conventional regenerative rotary air preheater 30, and the arrangement of the air passage and the smoke passage can be optimally designed.
【００３１】（５）熱媒体の１部を分岐配管１７で分岐
し、他の媒体と熱交換する熱交換器１９を併設すること
が可能であり、重油加熱器、地域暖房、等の熱源として
使用できる。(5) A part of the heat medium can be branched by a branch pipe 17 and a heat exchanger 19 for exchanging heat with other medium can be provided as a heat source for a heavy oil heater, district heating, etc. Can be used.
【００３２】（６）ボイラ排ガスダクト内に設置する熱
交換器を蒸発器とすればボイラ火炉を小さくすることが
できる。(6) If the heat exchanger installed in the boiler exhaust gas duct is an evaporator, the boiler furnace can be made smaller.
【００３３】[0033]
【発明の効果】以上、具体的に説明したように、本発明
においては、ボイラの空気ダクト側と排ガスダクト側の
熱交換器にボイラ缶水循環系統より分岐した配管により
熱媒体としてボイラ缶水を通し、空気ダクト側熱交換器
で燃焼用空気と熱交換させ、排ガスダクト側熱交換器で
排熱回収をし、このボイラ缶水をボイラ缶水循環系に戻
す構成とする。又、この構成に、空気ダクト側熱交換器
と並設した熱交換器を設けて他の熱源とする構成、排ガ
スダクト側熱交換器の熱媒体入口には空気ダクト側熱交
換器をパイパスする配管を設ける構成、更に、排ガスダ
クト側に蒸発器を設ける構成としたので次のような効果
を有する。As described above in detail, in the present invention, boiler can water is used as a heat medium by the pipes branched from the boiler can water circulation system in the heat exchangers on the air duct side and the exhaust gas duct side of the boiler. The boiler can water is passed through the air duct side heat exchanger to exchange heat with the combustion air, the exhaust gas duct side heat exchanger recovers exhaust heat, and the boiler can water is returned to the boiler can water circulation system. Further, in this configuration, a heat exchanger provided in parallel with the air duct side heat exchanger is provided as another heat source, and the air duct side heat exchanger is bypassed to the heat medium inlet of the exhaust gas duct side heat exchanger. Since the pipe is provided and the evaporator is provided on the exhaust gas duct side, the following effects are obtained.
【００３４】（１）再生式空気予熱器を採用しないた
め、洩漏空気によるボイラ効率の低下が防止出来る。(1) Since a regenerative air preheater is not used, it is possible to prevent a decrease in boiler efficiency due to leaked air.
【００３５】（２）蒸気式空気予熱器の設置が不要とな
る。(2) It is not necessary to install a steam type air preheater.
【００３６】（３）熱媒体を使用するので従来の再生回
転式空気予熱器の如く同一場所に必ずしも設置する必要
なく最適配置が設計できる。又、配置的に離れた位置に
ある他熱源との熱交換も可能である。(3) Since the heat medium is used, the optimum arrangement can be designed without necessarily installing it in the same place as in the conventional regenerative rotary air preheater. It is also possible to exchange heat with another heat source located at a distant position.
【００３７】（４）空気予熱器の熱媒体の１部をパイパ
スさせることにより排ガスダクト側熱交換器入口熱媒体
温度を調整することができ、低温腐食防止が確実とな
る。(4) By bypassing a part of the heat medium of the air preheater, the temperature of the heat medium at the inlet of the exhaust gas duct side heat exchanger can be adjusted, and low-temperature corrosion prevention is ensured.
【００３８】（５）排ガスダクト側熱交換器として蒸発
器を採用することによりボイラ火炉を小さく設計するこ
とが可能となる。(5) By using an evaporator as the heat exchanger on the exhaust gas duct side, the boiler furnace can be designed to be small.
【図１】本発明の一実施例に係る排熱回収装置の全体系
統図である。FIG. 1 is an overall system diagram of an exhaust heat recovery apparatus according to an embodiment of the present invention.
【図２】従来の排熱回収装置の全体系統図である。FIG. 2 is an overall system diagram of a conventional exhaust heat recovery device.
１ バーナ ２ ボイラ火炉 ３ 燃焼用空気ダクト ４ 火炉壁 ９ 蒸気ドラム １２ 分岐配管 １３ 制御弁 １４ 空気予熱器 １５ 排ガスクーラ １６ 出口連絡管 １７ 分岐配管 １８ 調整弁 １９ 熱交換器 ２１ 分岐配管 ２２ 調整弁 1 Burner 2 Boiler furnace 3 Combustion air duct 4 Furnace wall 9 Steam drum 12 Branch pipe 13 Control valve 14 Air preheater 15 Exhaust gas cooler 16 Outlet connecting pipe 17 Branch pipe 18 Control valve 19 Heat exchanger 21 Branch pipe 22 Control valve
Claims (4)
缶水循環系統から分岐した配管によりボイラ缶水を熱媒
体として通し、燃焼用空気と熱交換する空気ダクト側熱
交換器と、ボイラ排ガスダクト内に設置され、前記空気
ダクト側熱交換器からボイラ缶水を受け、排ガスから排
熱を回収する排ガスダクト側熱交換器と、同排ガスダク
ト側熱交換器からボイラ排ガスで加温されたボイラ缶水
を受け、同ボイラ缶水を前記ボイラ循環系統のドラムへ
戻す出口連絡管と、前記ボイラ缶水循環系統から分岐し
た配管の途中に設けられ、前記出口連絡管の前記ドラム
へ戻される缶水温度を検出し、ボイラ缶水の分岐量を調
整する制御弁とを具備してなることを特徴とする排熱回
収装置。1. An air duct side heat exchanger that is installed in a boiler air duct, passes boiler boiler water as a heat medium through a pipe branched from a boiler can water circulation system, and exchanges heat with combustion air, and a boiler exhaust gas duct. Installed in the air duct side heat exchanger, and receives boiler can water from the air duct side heat exchanger, recovers exhaust heat from exhaust gas, and a boiler can heated by the exhaust gas from the exhaust gas duct side heat exchanger. An outlet communication pipe that receives water and returns the boiler can water to the drum of the boiler circulation system, and a can water temperature that is provided in the middle of a pipe branched from the boiler can water circulation system and is returned to the drum of the outlet communication pipe. And a control valve for adjusting the amount of branching of boiler can water, and an exhaust heat recovery device.
管には分岐配管により前記空気ダクト側熱交換器と並列
に設置した熱交換器を設け、同熱交換器へのボイラ缶水
の分岐量は同熱交換器の加熱側流体出口温度を検出して
調整し、重油加熱器、地域暖房用等その他の熱源として
使用可能であることを特徴とする請求項１記載の排熱回
収装置。2. The pipe branching from the boiler can water circulation system is provided with a heat exchanger installed in parallel with the air duct side heat exchanger by a branch pipe, and the amount of boiler can water branched to the heat exchanger is The exhaust heat recovery apparatus according to claim 1, wherein the heating-side fluid outlet temperature of the heat exchanger is detected and adjusted, and can be used as a heat source for heavy oil heaters, district heating, and the like.
口へは硫酸腐食などの低温腐食対策として前記ボイラ缶
水循環系統より分岐した配管から前記空気ダクト側熱交
換器をパイパスする配管を接続したことを特徴とする請
求項１又は２記載の排熱回収装置。3. A pipe for bypassing the air duct side heat exchanger is connected to the heat medium inlet of the exhaust gas duct side heat exchanger from a pipe branched from the boiler can water circulation system as a low temperature corrosion countermeasure such as sulfuric acid corrosion. The exhaust heat recovery device according to claim 1 or 2, characterized in that.
することを特徴とする請求項１又は２又は３記載の排熱
回収装置。4. The exhaust heat recovery system according to claim 1, wherein the heat exchanger on the exhaust gas duct side is an evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06258030A JP3082826B2 (en) | 1994-10-24 | 1994-10-24 | Exhaust heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06258030A JP3082826B2 (en) | 1994-10-24 | 1994-10-24 | Exhaust heat recovery device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08121703A true JPH08121703A (en) | 1996-05-17 |
| JP3082826B2 JP3082826B2 (en) | 2000-08-28 |
Family
ID=17314566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06258030A Expired - Fee Related JP3082826B2 (en) | 1994-10-24 | 1994-10-24 | Exhaust heat recovery device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3082826B2 (en) |
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| CN105351626A (en) * | 2015-11-25 | 2016-02-24 | 中国能源建设集团广东省电力设计研究院有限公司 | Novel supporting hanger system for heat primary air channel on outlet of thermal power plant air preheater |
| US11274575B2 (en) | 2016-03-29 | 2022-03-15 | Mitsubishi Power, Ltd. | Gas turbine plant and operation method therefor |
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| CN106500127A (en) * | 2017-01-06 | 2017-03-15 | 上海明华电力技术工程有限公司 | A kind of bypass air preheater heat recovery system and method |
| CN113548710A (en) * | 2020-04-23 | 2021-10-26 | 中国石油天然气股份有限公司 | Sewage treatment system and sewage treatment method of process gas heat exchanger |
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