EP0162269A2 - Procédé et dispositif pour le réchauffage des gaz de foyer - Google Patents

Procédé et dispositif pour le réchauffage des gaz de foyer Download PDF

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Publication number
EP0162269A2
EP0162269A2 EP85104409A EP85104409A EP0162269A2 EP 0162269 A2 EP0162269 A2 EP 0162269A2 EP 85104409 A EP85104409 A EP 85104409A EP 85104409 A EP85104409 A EP 85104409A EP 0162269 A2 EP0162269 A2 EP 0162269A2
Authority
EP
European Patent Office
Prior art keywords
flue gas
heat exchanger
heat
heated
flue
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
Application number
EP85104409A
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German (de)
English (en)
Other versions
EP0162269A3 (en
EP0162269B1 (fr
Inventor
Horst Daschmann
Klaus Dipl.-Ing. Schmitt
Jürgen Dr. Dipl.-Ing. Künzel
Siegfried Dipl.-Ing. Rochna
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.)
Balcke Duerr AG
Original Assignee
Balcke Duerr AG
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.)
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Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6234258&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0162269(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Balcke Duerr AG filed Critical Balcke Duerr AG
Priority to AT85104409T priority Critical patent/ATE46960T1/de
Publication of EP0162269A2 publication Critical patent/EP0162269A2/fr
Publication of EP0162269A3 publication Critical patent/EP0162269A3/de
Application granted granted Critical
Publication of EP0162269B1 publication Critical patent/EP0162269B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite

Definitions

  • the invention relates to a method for re-heating flue gases coming from a flue gas cleaning system working according to the wet method by means of a heat exchanger arranged in the flue gas stream with a plurality of pipes through which a heat transfer medium flows and around which the cleaned gases flow, which are then passed into the atmosphere via a chimney are derived, as well as a device for performing this method.
  • flue gases In order to comply with legally required immission requirements, flue gases must be cleaned, e.g. be desulfurized.
  • the present invention relates exclusively to the reheating of the cleaned flue gases before they are discharged into the atmosphere above a chimney and can be applied both to the recuperative and to the regenerative method of reheating.
  • the invention has for its object to provide a method and an apparatus of the type described above for reheating flue gases coming from a flue gas cleaning system working according to the wet method, the heat exchangers arranged in the flue gas stream of which achieve service lives which correspond to those of the other power plant components, the investment costs in economically justifiable.
  • the solution to this problem by the method according to the invention is characterized in that the wet from the coming and passed through a droplet separator flue gas in a first, essentially graphite pre-heat exchanger is heated so that all water droplets still present in the flue gas evaporate, and that the dry flue gas through downstream heat exchangers made of metal, preferably high-alloy steel, on the for Discharge into the chimney required temperature is heated.
  • the pipes and essential components of which are made of graphite By drying the humid flue gases in a pre-heat exchanger, the pipes and essential components of which are made of graphite, the flue gases are deprived of their corrosive effect, so that they are then transferred through downstream heat exchangers made of metal, preferably high-alloy steel, to be introduced into the chimney required temperature can be heated.
  • the use of relatively expensive heat exchange surfaces made of graphite is thus limited according to the invention to a part of the heat exchanger surface arranged in the flue gas stream. The investment costs are therefore in an economic range, especially if the considerably increased service life of the heat exchanger surfaces used for reheating is taken into account.
  • components are used as pre-heat exchangers that have already proven themselves in the chemical industry. Such heat exchangers can be designed in a modular design, so that appropriate pre-heat exchangers can be put together for each individual case.
  • the pre-heat exchanger and the downstream heat exchanger can be heated by means of external energy or alternatively in that a heat transfer medium is heated by an essentially graphite flue gas cooler which extracts part of its heat from the unpurified flue gas stream before wet cleaning.
  • a heat transfer medium preferably water, circulates in a closed circuit. The heat used to reheat the cleaned flue gases is extracted from the uncleaned flue gas which, for example, has a temperature of approximately 140 ° Celsius before entering wet cleaning.
  • the flue gas cooler arranged in the uncleaned flue gas stream cools the flue gases to below the dew point, so that a high level of corrosion occurs, for example due to sulphurous acid, the flue gas cooler withstands these extreme loads because its essential parts consist of graphite.
  • a further improvement of the method according to the invention can finally be achieved according to the invention in that a part of the heated and dried flue gas stream is branched off into the chimney before being discharged and is introduced into the cleaned flue gas stream behind the droplet separator without streaks using a static mixer.
  • This recirculating partial flow of the heated, cleaned flue gas pre-dries the flue gas supplied to the heat exchangers, so that a reduction of the heat exchange surfaces consisting essentially of graphite can be achieved by this addition of dry, heated flue gas.
  • the device for carrying out the method according to the invention is characterized in that the tubes of the pre-heat exchanger used for drying the cleaned flue gas or of the flue gas cooler made of synthetic resin impregnated electrographite arranged in the uncleaned flue gas stream are made. According to a further feature of the invention, these tubes can be wrapped like a net with carbon fibers that are under tension.
  • a boiler system 1 In the systems shown in FIGS. 1 and 2, a boiler system 1 is shown, the flue gases of which pollutants are loaded are fed through a flue gas line 2 to a flue gas purification system 3 which operates using the wet method.
  • This flue gas cleaning system 3 is followed by a water separator 4, so that the cleaned flue gases, which have cooled the flue gas cleaning system 3 to about 500 degrees Celsius and are saturated with water vapor, contain only small residual amounts of water drops.
  • the cleaned flue gases pass through a clean gas line 5 through a silencer 6 into a chimney 7, through which they are discharged into the atmosphere.
  • a flue gas blower 8 is arranged in front of the silencer 6 in the clean gas line 5.
  • an essentially graphite ballast heat exchanger 9 is arranged in the clean gas duct 5, in which the flue gas coming from the flue gas cleaning system 3 is heated in such a way that all moisture still present in the flue gas evaporates.
  • the cleaned flue gas thus emerges heated and dried from the pre-heat exchanger and then passes into a heat exchanger 10, which is made of metal, preferably high-alloy steel.
  • a heat exchanger 10 which is made of metal, preferably high-alloy steel.
  • the group consisting essentially of graphite Vorschaltebenonesener 9 is a cleaning g un g Being upstream direction 11, which consists for example of several long retractable sootblowers, wherein the cleaning is performed by blowing off the heating surfaces with a steam jet.
  • cleaning g ungsdampf example dry superheated steam with a pressure of 12 to 16 bar and a Uberhitzungstemperatur of about 350 ° Celsius used.
  • Corresponding superheated steam can also be used for the parallel heating of the pre-heat exchanger 9 and the heat exchanger 10.
  • Part of the flue gas preheated and dried in the pre-heat exchanger 9 and heated in the heat exchanger 10 is branched off between the heat exchanger 10 and the flue gas blower 8 and fed into the clean gas line 5 through a recirculation line 12 between the water separator 4 and the cleaning device 11.
  • the returned part of the flue gas flow is 5 to 10% of the total gas throughput.
  • the recirculating partial flow of the heated flue gas which is admixed with the moist and cold flue gas flow and in this way causes predrying, is fed to the moist flue gas flow with the aid of a static mixer 14.
  • This mixer 14 ensures that a uniform temperature distribution over the entire flow cross section is achieved after a short mixing distance.
  • the heat carrier for the VorschaltezeSer 9 and the downstream heat exchanger 10 g in a Kreislaufleitun 15 circulated and heated in a flue gas cooler 16, which is arranged before the flue gas cleaning plant 3 in the flue gas line. 2
  • This flue gas cooler 16 consists essentially of graphite and thus corresponds to the pre-heat exchanger 9. Like this, the flue gas cooler 16 is preceded by a cleaning device 11.
  • the heat shift between the flue gas cooler 16 and the pre-heat exchanger 9 or heat exchanger 10 takes place with the aid of a circulation pump system 17, which is also shown schematically in FIG.
  • the cleaned flue gases are re-heated by means of a heat carrier which is circulated in a closed circuit and is preferably formed by water and which removes heat from the uncleaned flue gas, which has a temperature of approximately 140 ° Celsius before entering the flue gas cleaning system 3. Also in the embodiment according to FIG. 2, part of the cleaned flue gas is recirculated in order to dry the moist flue gas stream at least partially by adding dry flue gas before it is definitely dried in the pre-heat exchanger 9.
  • the flue gas cooler 16 has a high level time since it consists essentially of graphite. These tubes of the flue gas cooler 16 are regularly cleaned by an associated cleaning device 11.
  • a heater stage 18 can be provided downstream of the heat exchanger 10 as shown in FIG. 2.
  • steam-heated heater stage 18 has the task not only of achieving a further increase in the flue gas temperature, but also of preheating the flue gases flowing back through the recirculation line 12 when starting up.
  • the system can be kept dry by the explosive plume from the Rauchgasreinigun g sanla g e 3 heat exchanger surfaces by such a heater stage 18 when switched off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chimneys And Flues (AREA)
EP85104409A 1984-04-21 1985-04-12 Procédé et dispositif pour le réchauffage des gaz de foyer Expired EP0162269B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85104409T ATE46960T1 (de) 1984-04-21 1985-04-12 Verfahren und vorrichtung zur wiederaufheizung von rauchgasen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3415238 1984-04-21
DE19843415238 DE3415238A1 (de) 1984-04-21 1984-04-21 Verfahren und vorrichtung zur wiederaufheizung von rauchgasen

Publications (3)

Publication Number Publication Date
EP0162269A2 true EP0162269A2 (fr) 1985-11-27
EP0162269A3 EP0162269A3 (en) 1987-09-16
EP0162269B1 EP0162269B1 (fr) 1989-10-04

Family

ID=6234258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104409A Expired EP0162269B1 (fr) 1984-04-21 1985-04-12 Procédé et dispositif pour le réchauffage des gaz de foyer

Country Status (3)

Country Link
EP (1) EP0162269B1 (fr)
AT (1) ATE46960T1 (fr)
DE (2) DE3415238A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0443645A2 (fr) * 1990-02-13 1991-08-28 METALLGESELLSCHAFT Aktiengesellschaft Procédé de purification de gaz d'échappement
CN102121703A (zh) * 2010-12-28 2011-07-13 哈尔滨工业大学 适用于高寒地区湿式烟气净化工艺的混合式烟气再热系统
CN102695937A (zh) * 2009-12-11 2012-09-26 西格里碳素欧洲公司 由碳化硅制成的树脂浸渍体
JP2013514512A (ja) * 2009-12-17 2013-04-25 エスゲーエル カーボン ソシエタス ヨーロピア 繊維強化物品
CN107082464A (zh) * 2017-06-22 2017-08-22 聊城信源集团有限公司 一种脱硫废水零排放处理烟道和处理系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4008617A1 (de) * 1990-03-17 1991-09-19 Kraftanlagen Ag Verfahren zum schutz von druckerhoehungsgeblaesen in nachschaltung zur nassentschwefelung von abgasen
CN103486603B (zh) * 2013-10-11 2016-05-11 光大环保（中国）有限公司 一种烟气处理装置及处理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839849A (en) * 1971-08-24 1974-10-08 G Maniya Wet type desulfurization system for flue gas
DE2703681A1 (de) * 1977-01-29 1978-08-03 Blohm Voss Ag Verfahren und vorrichtung zur erwaermung von gewaschenen rauchgasen
DE2724030A1 (de) * 1977-05-27 1978-12-07 Metallgesellschaft Ag Aufheizen von abgasen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720078C2 (de) * 1977-05-05 1982-10-21 Sigri Elektrographit Gmbh, 8901 Meitingen Verfahren zur Vergrößerung der wärmeaustauschenden Fläche von Graphitelementen in einem Wärmeaustauscher
DE3116309C2 (de) * 1981-04-24 1985-05-02 Sigri Elektrographit Gmbh, 8901 Meitingen Graphitrohr

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839849A (en) * 1971-08-24 1974-10-08 G Maniya Wet type desulfurization system for flue gas
DE2703681A1 (de) * 1977-01-29 1978-08-03 Blohm Voss Ag Verfahren und vorrichtung zur erwaermung von gewaschenen rauchgasen
DE2724030A1 (de) * 1977-05-27 1978-12-07 Metallgesellschaft Ag Aufheizen von abgasen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0443645A2 (fr) * 1990-02-13 1991-08-28 METALLGESELLSCHAFT Aktiengesellschaft Procédé de purification de gaz d'échappement
EP0443645A3 (en) * 1990-02-13 1991-09-11 Metallgesellschaft Aktiengesellschaft Exhaust gas purification process
CN102695937A (zh) * 2009-12-11 2012-09-26 西格里碳素欧洲公司 由碳化硅制成的树脂浸渍体
JP2013514512A (ja) * 2009-12-17 2013-04-25 エスゲーエル カーボン ソシエタス ヨーロピア 繊維強化物品
CN102121703A (zh) * 2010-12-28 2011-07-13 哈尔滨工业大学 适用于高寒地区湿式烟气净化工艺的混合式烟气再热系统
CN107082464A (zh) * 2017-06-22 2017-08-22 聊城信源集团有限公司 一种脱硫废水零排放处理烟道和处理系统

Also Published As

Publication number Publication date
EP0162269A3 (en) 1987-09-16
DE3415238A1 (de) 1985-10-31
ATE46960T1 (de) 1989-10-15
EP0162269B1 (fr) 1989-10-04
DE3573466D1 (en) 1989-11-09

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