JPS61217694A - Composite type gas preheater - Google Patents
Composite type gas preheaterInfo
- Publication number
- JPS61217694A JPS61217694A JP5804185A JP5804185A JPS61217694A JP S61217694 A JPS61217694 A JP S61217694A JP 5804185 A JP5804185 A JP 5804185A JP 5804185 A JP5804185 A JP 5804185A JP S61217694 A JPS61217694 A JP S61217694A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- heat exchanger
- heat pipe
- heat
- temperature
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は石炭焚きボイラ排ガス等含塵ガスからの排熱回
収に用いるボイラ用エアヒータ、燃料ガス加熱装置等の
複合形気体予熱器に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite gas preheater for a boiler air heater, a fuel gas heating device, etc. used for recovering exhaust heat from dust-containing gas such as coal-fired boiler exhaust gas.
第４図は従来例を示す気体予熱装置の側面図であ石。 FIG. 4 is a side view of a conventional gas preheating device.
従来、隔壁を隔てて複数の熱交換器０１，０２を配置し
、それぞれの熱交換器０１，０２間に伝熱媒体０３を循
環させて熱の授受を行う気体予熱器は、高温排ガス０４
等の加熱気体と被加熱気体０５の混合、あるいは一方の
ダクト０６から他方のダクト０７への気体の漏洩を避け
る場合に使用されている。上記気体予熱器０８において
、水を伝熱媒体０３として使用し、かつ熱交換器０１，
０２の一方を蒸発器０９、他方を凝縮器Ｏ１Ｏとして、
蒸気と水の密度差を利用する自然循環で伝熱媒体を循環
させる方式が一般に採用されている。しかしながら、上
記方式では熱交換を行う温度領域が高くなるに従って、
伝熱媒体０３である水の飽和圧力も高くなるため、水と
蒸気の密度差が減少し、自然循環力が低下する。したが
って水を伝熱媒体０３として使用する上記気体予熱器０
８では実用できる上限の温−レベルが存在し、被加熱気
体０５の温度を３５０℃以上とすることは困難である。Conventionally, a gas preheater in which a plurality of heat exchangers 01 and 02 are arranged with a partition wall in between and exchanges heat by circulating a heat transfer medium 03 between the heat exchangers 01 and 02, uses high-temperature exhaust gas 04.
It is used to mix heated gas and heated gas 05, or to avoid leakage of gas from one duct 06 to the other duct 07. In the gas preheater 08, water is used as the heat transfer medium 03, and the heat exchanger 01,
02 as an evaporator 09 and the other as a condenser O1O,
Generally, a method is adopted in which the heat transfer medium is circulated through natural circulation that utilizes the density difference between steam and water. However, in the above method, as the temperature range for heat exchange increases,
Since the saturation pressure of water, which is the heat transfer medium 03, also increases, the density difference between water and steam decreases, and the natural circulation force decreases. Therefore, the above gas preheater 0 using water as the heat transfer medium 03
8, there is a practical upper limit temperature level, and it is difficult to increase the temperature of the heated gas 05 to 350°C or higher.
また、従来の上記気体予熱器は、自然循環の上で有利な
伝熱管垂直配置を採用している。伝熱管は通常、円形フ
ィン付管で構成されるが、排ガス中に灰などの塵埃を含
む場合、フィンの表面に塵埃が堆積しやすく、また水洗
などによる洗浄も充分に効果を発揮しにくい伝熱管配置
である。Further, the conventional gas preheater employs a vertical arrangement of heat exchanger tubes, which is advantageous for natural circulation. Heat transfer tubes are usually constructed of circular finned tubes, but if the exhaust gas contains dust such as ash, the dust tends to accumulate on the surface of the fins, and cleaning with water etc. is difficult to achieve a sufficient effect. This is a heat tube arrangement.
石炭火力の燃料の炭種によっては、空気予熱温度が約３
５０℃以上を必要としても、水だけを伝熱媒体として使
用する場合には、自然循環が成立せず、約４００℃の排
ガス温度を有効に熱交換させることができなかった。ま
た、排ガス中に含まれる塵が、熱交換器を構成する伝熱
管のフィン等の伝熱面に付着して伝熱面を閉塞し、伝熱
効率が低下する等の不具合があった。Depending on the type of coal used as fuel for coal-fired power plants, the air preheating temperature may be approximately 3.
Even if a temperature of 50° C. or higher is required, when only water is used as a heat transfer medium, natural circulation is not established, and the exhaust gas temperature of about 400° C. cannot be effectively exchanged. In addition, dust contained in the exhaust gas adheres to heat transfer surfaces such as fins of heat transfer tubes constituting the heat exchanger and blocks the heat transfer surfaces, resulting in a reduction in heat transfer efficiency.
〔問題点を解決するための手段〕
本発明は、区画壁をはさんで相隣る２本の竪向きのダク
トの一方を高温排ガスが上部から下向きに流れ、被加熱
気体は上Ｊｐ労を下部から上向きに流れ、上記ダクト間
！ｃまたがって上記区画壁を貫通し設けられた熱交換器
内を循環する伝熱媒体によって熱輸送を行い上記高温排
ガスと上記被加熱勿体間に熱交換を行なうガス整流れ方
式の複合形気体予熱器において、高温部には有機熱媒を
伝熱媒体として使用した単管形ヒートパイプ式熱交換器
、中低温部には水が自然循環する分離形ヒートパイプ式
熱交換器をそれぞれそ加熱管を実質的に水平に配して取
付けてなることを特徴とする複合形気体予熱器を供する
ものである。[Means for Solving the Problems] The present invention is characterized in that high-temperature exhaust gas flows downward from the top through one of two vertical ducts adjacent to each other with a partition wall in between, and the heated gas Flows upward from the bottom and between the above ducts! (c) Composite gas preheating using a gas rectification method, in which heat is transported by a heat transfer medium circulating in a heat exchanger installed across the partition wall, and heat is exchanged between the high-temperature exhaust gas and the heated body. The high-temperature section is equipped with a single-tube heat pipe heat exchanger that uses an organic heating medium as the heat transfer medium, and the medium-low temperature section is equipped with a separate heat pipe heat exchanger that naturally circulates water. The present invention provides a composite gas preheater characterized in that the gas preheater is installed substantially horizontally.
以下、第１，２図に本発明に係わるガス整流れ方式のハ
イブリッド形ヒートパイプ式空気予熱器の１実施例を概
念的に示しその構成作用を説明する。本実施例の空気予
熱器１において、高温部は有機熱媒を使用した単管形ヒ
ートパイプ式熱交換器２で構成され、中低温部は水が自
然循環する分離形ヒートパイプ式熱交換器３で構成され
ている。従って、高温のボイラ排ガス４は上部から下向
きに流れ、熱交換によって低温の排ガス５となり、図示
省略の脱硫装置あるいはそのま〜図示省略の排煙装置へ
排出される。1 and 2 conceptually show one embodiment of the gas rectification type hybrid heat pipe type air preheater according to the present invention, and its construction and operation will be explained. In the air preheater 1 of this embodiment, the high temperature section is composed of a single tube heat pipe type heat exchanger 2 using an organic heat medium, and the medium and low temperature section is composed of a separate type heat pipe type heat exchanger 2 in which water naturally circulates. It consists of 3. Therefore, high-temperature boiler exhaust gas 4 flows downward from the top, becomes low-temperature exhaust gas 5 through heat exchange, and is discharged to a desulfurization device (not shown) or directly to a smoke exhaust device (not shown).
一方、図示省略の強制通風機より送られる空気６は下部
から上向きに流れ、熱交換によって高なお分離形ヒート
パイプ式熱交換器３は排ガス５および空気６の温度レベ
ルに応じて複数のモジュールに分割する必要がある。ま
た自然循環力を確保する上から、排ガス５側の蒸発器部
分３ａを空気側の凝縮部分３ｂよりも低い位置におく必
要がある。これに対して、単管形ヒートパイプ式熱交換
器２では排ガスＧおよび空気６の温度レベルに応じてヒ
ートパイプの作動点（熱媒圧力および温度）が自動的に
決まる。第３図は、ハイブリッド形ヒートパイプ式空気
予熱器全体の作動状態を示す温度線図の例である。この
例では、排ガス温度４００℃から３５０℃までを単管形
ヒートパイプ２の使用範囲とし、また、３５０℃から１
４０℃までを分離形ヒートパイプ３の使用範囲として、
分離形の範囲についてはさらに温度レベルによって６個
のモジュールに分割している。On the other hand, air 6 sent from a forced draft fan (not shown) flows upward from the bottom, and the high-performance separated heat pipe type heat exchanger 3 is divided into multiple modules according to the temperature levels of the exhaust gas 5 and air 6 through heat exchange. need to be divided. Further, in order to ensure natural circulation force, it is necessary to place the evaporator section 3a on the exhaust gas 5 side at a lower position than the condensation section 3b on the air side. On the other hand, in the single-tube heat pipe type heat exchanger 2, the operating point (heating medium pressure and temperature) of the heat pipe is automatically determined according to the temperature levels of the exhaust gas G and the air 6. FIG. 3 is an example of a temperature diagram showing the operating state of the entire hybrid heat pipe type air preheater. In this example, the exhaust gas temperature range is from 400°C to 350°C, and the usage range of the single tube heat pipe 2 is from 350°C to 1°C.
The usage range of the separate heat pipe 3 is up to 40℃.
The separate type range is further divided into six modules depending on temperature level.
気体予熱器は有機熱媒を伝熱媒体として使用した単管形
ヒートパイプ式熱交換器を高温部に、水が自然循環する
分離形ヒートパイプ式熱交換器を中低部に配設した竪形
の複合形気体予熱器で、上記各熱交換器が複数段積層し
たダクト内は、高温排ガスと被加熱気体とは隔壁で完全
に区画されているので、効率よく被加熱気体の予熱温度
が必要に応じて３５０℃ないしそれ以上にできる。The gas preheater is a vertical type heat exchanger that uses an organic heat medium as a heat transfer medium and has a single-tube heat pipe heat exchanger in the high-temperature section and a separate heat pipe heat exchanger that naturally circulates water in the middle and lower parts. This is a composite type gas preheater.In the duct where each of the above heat exchangers is stacked in multiple stages, the high temperature exhaust gas and the heated gas are completely separated by a partition wall, so the preheating temperature of the heated gas can be efficiently adjusted. The temperature can be raised to 350°C or higher if necessary.
また、各熱交換器を構成する複数本の伝熱管が水平に配
設されているので、含塵ガスによる伝熱部伝熱面の閉塞
防止ないし、ダスト付着対策としてスーツブローおよび
水洗が容易な伝熱面配置の採用が可能となる。In addition, since the multiple heat transfer tubes that make up each heat exchanger are arranged horizontally, the heat transfer surface of the heat transfer section is prevented from being clogged by dust-containing gas, and suit blowing and water washing are easy to prevent dust adhesion. It becomes possible to adopt a heat transfer surface arrangement.
第１図は本発明に係わるガス整流れ方式の複合形空気予
熱器の１実施例を概念的に示した側面図、第２図は、第
１図のＡ−Ａ矢視側面図、第３図はハイブリッド形ヒー
トパイプ式空気予熱器全体の作動状態を示す温度糾図の
例、第４図は従来例を示す装置の側面図である。
１・・・複合形気体予熱器、２・・・単管形ヒートパイ
プ式熱交換器、３・・・分離形ヒートパイプ式熱交換器
、４・・・高温のボイラ排ガス、５・・・低温の排ガス
、６・・・被加熱用の空気、３ａ・・・排ガス側の蒸発
器部分、３ｂ・・・空気側の凝縮部分。FIG. 1 is a side view conceptually showing an embodiment of a gas rectification type composite air preheater according to the present invention, FIG. 2 is a side view taken along arrow A-A in FIG. The figure is an example of a temperature chart showing the operating state of the entire hybrid heat pipe type air preheater, and FIG. 4 is a side view of the device showing a conventional example. 1... Composite gas preheater, 2... Single tube heat pipe heat exchanger, 3... Separate heat pipe heat exchanger, 4... High temperature boiler exhaust gas, 5... Low-temperature exhaust gas, 6... Air for heating, 3a... Evaporator part on the exhaust gas side, 3b... Condensing part on the air side.
Claims (1)
高温排ガスが上部から下向きに流れ、被加熱気体は上記
ダクトの他方を下部から上向きに流れ、上記ダクト間に
またがつて上記区画壁を貫通し設けられた熱交換器内を
循環する伝熱媒体によつて熱輸送を行い上記高温排ガス
と上記被加熱気体間に熱交換を行なうガス竪流れ方式の
複合形気体予熱器において、高温部には有機熱媒を伝熱
媒体として使用した単管形ヒートパイプ式熱交換器、中
低温部には水が自然循環する分離形ヒートパイプ式熱交
換器をそれぞれその伝熱管を実質的に水平に配して取付
けてなることを特徴とする複合形気体予熱器。High-temperature exhaust gas flows downward from the top through one of the two vertical ducts adjacent to each other across the partition wall, and the heated gas flows upward through the other duct from the bottom, straddling the space between the ducts. A vertical gas flow type composite gas preheater that transports heat by a heat transfer medium that circulates in a heat exchanger that penetrates the partition wall and exchanges heat between the high-temperature exhaust gas and the heated gas. In the high temperature section, a single tube heat pipe type heat exchanger using an organic heat medium as the heat transfer medium is used, and in the medium and low temperature section, a separate type heat pipe type heat exchanger with natural circulation of water is used. A composite gas preheater characterized by being installed substantially horizontally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5804185A JPH0631696B2 (en) | 1985-03-22 | 1985-03-22 | Combined gas preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5804185A JPH0631696B2 (en) | 1985-03-22 | 1985-03-22 | Combined gas preheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61217694A true JPS61217694A (en) | 1986-09-27 |
| JPH0631696B2 JPH0631696B2 (en) | 1994-04-27 |
Family
ID=13072847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5804185A Expired - Lifetime JPH0631696B2 (en) | 1985-03-22 | 1985-03-22 | Combined gas preheater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0631696B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2642154A1 (en) * | 1989-01-25 | 1990-07-27 | Const Aero Navales | Method for cooling a hot fluid using a cold fluid, without a common exchange surface in contact with these fluids, and exchanger for implementation thereof |
| US5607011A (en) * | 1991-01-25 | 1997-03-04 | Abdelmalek; Fawzy T. | Reverse heat exchanging system for boiler flue gas condensing and combustion air preheating |
| CN102012039A (en) * | 2010-12-22 | 2011-04-13 | 深圳中兴节能环保股份有限公司 | Forced circulation air preheat system |
| CN106152169A (en) * | 2016-07-08 | 2016-11-23 | 彭东林 | A kind of horizontal heat-pipe air preheater |
-
1985
- 1985-03-22 JP JP5804185A patent/JPH0631696B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2642154A1 (en) * | 1989-01-25 | 1990-07-27 | Const Aero Navales | Method for cooling a hot fluid using a cold fluid, without a common exchange surface in contact with these fluids, and exchanger for implementation thereof |
| US5607011A (en) * | 1991-01-25 | 1997-03-04 | Abdelmalek; Fawzy T. | Reverse heat exchanging system for boiler flue gas condensing and combustion air preheating |
| CN102012039A (en) * | 2010-12-22 | 2011-04-13 | 深圳中兴节能环保股份有限公司 | Forced circulation air preheat system |
| CN106152169A (en) * | 2016-07-08 | 2016-11-23 | 彭东林 | A kind of horizontal heat-pipe air preheater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0631696B2 (en) | 1994-04-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |