WO2023185110A1 - 一种基于热回收焦炉的烟气工艺 - Google Patents
一种基于热回收焦炉的烟气工艺 Download PDFInfo
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- WO2023185110A1 WO2023185110A1 PCT/CN2022/139821 CN2022139821W WO2023185110A1 WO 2023185110 A1 WO2023185110 A1 WO 2023185110A1 CN 2022139821 W CN2022139821 W CN 2022139821W WO 2023185110 A1 WO2023185110 A1 WO 2023185110A1
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- WIPO (PCT)
- Prior art keywords
- flue gas
- coke oven
- temperature flue
- waste heat
- heat recovery
- Prior art date
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- 239000003546 flue gas Substances 0.000 title claims abstract description 180
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 179
- 239000000571 coke Substances 0.000 title claims abstract description 136
- 238000011084 recovery Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000002918 waste heat Substances 0.000 claims abstract description 78
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000012423 maintenance Methods 0.000 claims abstract description 11
- 238000000746 purification Methods 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 4
- 238000004939 coking Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000003763 carbonization Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0031—Regulation through control of the flow of the exhaust gases
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Definitions
- the invention relates to the technical field of waste heat utilization of heat recovery coke ovens in coking production, and in particular to a flue gas process based on heat recovery coke ovens.
- the heat recovery coke oven refers to a coke production device that operates at a slight negative pressure in the coke oven carbonization chamber, mechanizes tamping, coal loading, coke extraction, and recovers and utilizes the waste heat of coking combustion exhaust gas.
- the high-temperature carbonization of coking coal produces coke, chemical products, coke oven gas and some harmful substances.
- the chemical products, coke oven gas and some harmful substances are reasonably and fully burned inside the heat recovery coke oven.
- a large amount of high-temperature flue gas of 850 to 1200°C will be generated.
- the coke oven waste heat boiler will efficiently recover and rationally utilize the waste heat resources generated during the heat recovery coke oven production process to produce high-temperature and high-pressure superheated steam to drive subsequent turbine generators to generate electricity or heat.
- a group of coke ovens is equipped with a coke oven waste heat boiler and an accident radiation chimney, and there are too many accident radiation chimneys;
- the coke oven waste heat boiler is arranged between two coke ovens, making boiler maintenance inconvenient.
- the present invention provides a flue gas process based on heat recovery coke oven. It can cut off the accident coke oven waste heat boiler and use the remaining coke oven waste heat boiler to recover high-temperature flue gas waste heat, localizing the accident without affecting the overall operation of the system and effectively recovering high-temperature flue gas waste heat; reducing investment and land occupation, flexible layout plan, and easy maintenance convenient.
- a flue gas system based on a heat recovery coke oven including a heat recovery coke oven, a coke oven waste heat boiler, a flue gas purification device, a chimney, and an accident relief chimney; there are multiple heat recovery coke ovens and coke oven waste heat boilers, and there are multiple heat recovery coke ovens and coke oven waste heat boilers.
- the heat recovery coke ovens are connected in parallel through pipelines. The number of heat recovery coke ovens and coke oven waste heat boilers is the same.
- One heat recovery coke oven corresponds to one coke oven waste heat boiler.
- the top gas collecting pipe of the heat recovery coke oven is connected to the high temperature flue gas pipe through the high temperature flue gas pipe.
- the coke oven waste heat boiler is connected, and the high-temperature flue gas pipe is equipped with a high-temperature flue gas bypass and is connected to the accident emission chimney; the coke oven waste heat boiler is connected to the flue gas purification device through the first low-temperature flue gas pipe, and the flue gas purification device is connected to the chimney pipe.
- the high-temperature flue gas pipe is provided with a boiler flue gas inlet electric cut-off valve
- the high-temperature flue gas bypass is equipped with a chimney flue gas inlet electric cut-off valve and a high-temperature flue gas bypass electric cut-off valve
- the first low-temperature flue gas pipe is provided with Boiler flue gas outlet electric shut-off valve.
- the flue gas purification device is connected to the induced draft fan through the second low-temperature flue gas pipe, and the induced draft fan is connected to the chimney through the third low-temperature flue gas pipe.
- a flue gas process based on heat recovery coke oven specifically including:
- the high-temperature flue gas generated by the heat recovery coke oven first enters the top gas collecting pipe arranged on the top of the furnace.
- the high-temperature flue gas temperature is 1050 ⁇ 1150°C, and then enters the coke oven waste heat through the high-temperature flue gas pipe connected with the furnace top gas collecting pipe.
- the boiler performs heat exchange, and the heat-exchanged low-temperature flue gas passes through the first low-temperature flue gas pipe, the flue gas purification device, the second low-temperature flue gas pipe, the induced draft fan, and the third low-temperature flue gas pipe and then enters the chimney for dispersion;
- the low-temperature flue gas Temperature is 165 ⁇ 180°C;
- the coke oven waste heat boiler operates at rated parameters.
- the high-temperature flue gas bypass electric cut-off valve and the chimney flue gas inlet electric cut-off valve are shut off.
- the corresponding shut-off valve will The boiler flue gas inlet electric cut-off valve on the high-temperature flue gas pipe and the boiler flue gas outlet electric cut-off valve on the first low-temperature flue gas pipe open the corresponding high-temperature flue gas bypass electric cut-off valve and chimney on the high-temperature flue gas bypass The flue gas inlet electric cut-off valve radiates the high-temperature flue gas generated by the heat recovery coke oven corresponding to the coke oven waste heat boiler through the accident relief chimney.
- the present invention can cut off the coke oven waste heat boiler for accident maintenance, rationally configure the equipment capacity of the coke oven waste heat boiler, flexibly operate the supporting coke oven waste heat boiler, and configure multiple coke oven waste heat boilers to prevent high-temperature flue gas from escaping. , configuring two coke oven waste heat boilers can reduce the emission of high-temperature flue gas, effectively recover waste heat, protect the environment, and create good economic and social benefits.
- the present invention can enable multiple coke oven waste heat boilers to operate in parallel, uniformly consider the configuration of subsequent waste heat utilization equipment, save equipment space, reduce equipment investment, simplify production operations, and make production operations flexible.
- the present invention can send the flue gas generated by each heat recovery coke oven to the accident relief chimney for dissipation through the high-temperature flue gas bypass and the high-temperature flue gas bypass electric cut-off valve. It is not necessary to set up an accident dispersion chimney for a group of coke ovens. , Reduce the installation of accidental emission chimneys, save investment and save land space.
- the flue gas system of the present invention is suitable for various newly built, renovated and expanded heat recovery coke oven flue gas systems.
- Figure 1 is a structural schematic and process flow diagram of the present invention.
- a flue gas system based on heat recovery coke ovens includes 2 heat recovery coke ovens 1, 2 coke oven waste heat boilers 2, 1 flue gas purification device 3, chimney 5, and accident emission chimney 6 , high temperature flue gas pipe 8, first low temperature flue gas pipe 9, second low temperature flue gas pipe 10, third low temperature flue gas pipe 11, high temperature flue gas pipe 12, boiler flue gas inlet electric shut-off valve 13, chimney flue gas inlet Electric cut-off valve 14, high-temperature flue gas bypass electric cut-off valve 15 and boiler flue gas outlet electric cut-off valve 16.
- Two heat recovery coke ovens 1 are connected in parallel through pipelines.
- the heat recovery coke oven 1 and the coke oven waste heat boiler 2 have the same number.
- One heat recovery coke oven 1 corresponds to one coke oven waste heat boiler 2.
- the top gas collecting pipe 7 of the heat recovery coke oven 1 is connected to the coke oven waste heat boiler 2 through the high temperature flue gas pipe 8.
- the high temperature flue gas pipe 8 is equipped with a high temperature flue gas bypass 12 and is connected to the accident release chimney 6; the coke oven waste heat boiler 2
- the flue gas purification device 3 is connected to the flue gas purification device 3 through the first low-temperature flue gas pipe 9 , the flue gas purification device 3 is connected to the induced draft fan 4 through the second low-temperature flue gas pipe 10 , and the induced draft fan 4 is connected to the chimney 5 through the third low-temperature flue gas pipe 11 .
- the high-temperature flue gas pipe 8 is provided with a boiler flue gas inlet electric cut-off valve 13.
- the high-temperature flue gas bypass 12 is provided with a chimney flue gas inlet electric cut-off valve 14 and a high-temperature flue gas bypass electric cut-off valve 15.
- the first low-temperature flue gas The pipe 9 is provided with an electric cut-off valve 16 for the boiler flue gas outlet.
- the coke oven waste heat boiler 2 is a high-temperature and high-pressure boiler with a rated steam temperature of 540°C and a rated steam pressure of 9.81MPa.
- the flue gas purification device 3 is an integrated device for dust removal, desulfurization and denitrification.
- two sets of heat recovery coke ovens 1 are equipped with two coke oven waste heat boilers 2, and the two coke oven waste heat boilers 2 share an accident relief chimney 6 and a chimney 5.
- a flue gas process based on heat recovery coke oven specifically including:
- the high-temperature flue gas generated by the heat recovery coke oven 1 enters the top gas collecting pipe 7 arranged on the top of the furnace.
- the flue gas temperature is 1050 ⁇ 1150°C, and then enters the coke through the high-temperature flue gas pipe 8 connected with the furnace top gas collecting pipe 7.
- the furnace waste heat boiler 2 performs heat exchange, and the low-temperature flue gas with a temperature of 165 to 180°C after heat exchange passes through the first low-temperature flue gas pipe 9, the flue gas purification device 3, the second low-temperature flue gas pipe 10, the induced draft fan 4, and the The three low-temperature flue gas pipes 11 then enter the chimney 5 for dispersion, and the flue gas temperature is ⁇ 80°C.
- Every two heat recovery coke ovens are a group, and a group of heat recovery coke ovens 1 corresponds to a coke oven waste heat boiler 2.
- the coke oven waste heat boiler 2 operates at rated parameters, and the high-temperature flue gas bypass electric shut-off valve 15 and the chimney flue gas inlet electric cut-off valve 14 are turned off.
- the boiler flue gas inlet electric cut-off valve 13 and the first low temperature on the corresponding high-temperature flue gas pipe 8 are turned off.
- the boiler flue gas outlet electric cut-off valve 16 on the flue gas pipe 9 opens the corresponding high-temperature flue gas bypass electric cut-off valve 15 on the high-temperature flue gas bypass 12 and the chimney flue gas inlet electric cut-off valve 14, and the corresponding coke oven waste heat
- the high-temperature flue gas generated by the heat recovery coke oven 1 of the boiler 2 is released through the accident release chimney 6 .
- the present invention is not limited to two groups of heat recovery coke ovens 1 configured with two coke oven waste heat boilers 2.
- any one of the coke oven waste heat boilers 2 may fail or
- the boiler flue gas inlet electric cut-off valve 13 on the corresponding high-temperature flue gas pipe 8 and the boiler flue gas outlet electric cut-off valve 16 on the first low-temperature flue gas pipe 9 are turned off, and the corresponding high-temperature flue gas bypass 12 is opened.
- the high-temperature flue gas bypass electric cut-off valve 15 is closed on the chimney flue gas inlet electric cut-off valve 14, and the high-temperature flue gas generated by the heat recovery coke oven 1 corresponding to the coke oven waste heat boiler 2 for accident maintenance is passed through the high-temperature flue gas bypass 12 Distributed to the remaining coke oven waste heat boilers 2, eventually, the high-temperature flue gas generated by the multiple groups of heat recovery coke ovens 1 can completely exchange heat with the remaining coke oven waste heat boilers 2, so the flue gas does not have to be dissipated through the accident release chimney 6, and the flexible operation is supported Operation of coke oven waste heat boiler.
- the invention can cut off the accidental coke oven waste heat boiler and use the remaining coke oven waste heat boiler to recover high-temperature flue gas waste heat, localize the accident without affecting the overall operation of the system, effectively recover high-temperature flue gas waste heat, and all coke oven waste heat boilers 2 are set up uniformly
- An accident radiation chimney 6 reduces investment and area.
- the coke oven waste heat boiler 2 is not limited to being arranged between two heat recovery coke ovens 1, and is not limited to the heat recovery coke oven 1 being arranged on both sides of the coke quenching car.
- Furnace waste heat boiler 2 has flexible layout and easy maintenance.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Coke Industry (AREA)
Abstract
本发明涉及焦化生产中热回收焦炉余热利用技术领域，尤其涉及一种基于热回收焦炉的烟气工艺。热回收焦炉产生的高温烟气首先进入炉顶的炉顶集气管，然后进入焦炉余热锅炉进行换热，换热后的低温烟气进入烟囱放散；当任何一台焦炉余热锅炉事故或检修时，关断相应的锅炉烟气进口电动切断阀及锅炉烟气出口电动切断阀，打开高温烟气旁路上的高温烟气旁路电动切断阀和烟囱烟气进口电动切断阀，将对应焦炉余热锅炉的热回收焦炉产生的高温烟气通过事故放散烟囱放散。能将事故焦炉余热锅炉切掉，利用剩余焦炉余热锅炉回收高温烟气余热，使事故局部化，不影响系统整体运行，有效回收高温烟气余热；减少投资占地，布置方案灵活，检修方便。
Description
本发明涉及焦化生产中热回收焦炉余热利用技术领域，尤其涉及一种基于热回收焦炉的烟气工艺。
热回收焦炉是指焦炉炭化室微负压操作、机械化捣固、装煤、出焦、回收利用炼焦燃烧废气余热的焦炭生产装置。在热回收焦炉炼焦过程中炼焦煤高温干馏产生焦炭、化学产品、焦炉煤气和一些有害的物质，其化学产品、焦炉煤气和一些有害的物质在热回收焦炉内部合理地充分燃烧，会产生大量的850～1200℃高温烟气，通过焦炉余热锅炉高效回收并且合理利用热回收焦炉生产过程中所产生的余热资源，生产高温高压过热蒸汽驱动后续汽轮发电机组发电或供热，已经成为提高热回收焦炉效率的主要途径之一，既减少污染废气的排放，又节约能源，为焦化企业带来可观的经济效益和社会效益，也是热回收焦炉节能的主要发展方向和潜力所在。
目前部分技术方案存在以下问题：1、一组焦炉配置一个焦炉余热锅炉一个事故放散烟囱，事故放散烟囱过多；2、焦炉余热锅炉布置在两座焦炉之间，锅炉检修不便。
发明内容
为了克服现有技术的不足，本发明提供了一种基于热回收焦炉的烟气工艺。能将事故焦炉余热锅炉切掉，利用剩余焦炉余热锅炉回收高温烟气余热，使事故局部化，不影响系统整体运行，有效回收高温烟气余热；减少投资占地，布置方案灵活，检修方便。
为了达到上述目的，本发明采用以下技术方案实现：
一种基于热回收焦炉的烟气系统，包括热回收焦炉、焦炉余热锅炉、烟气净化装置、烟囱、事故放散烟囱；所述热回收焦炉、焦炉余热锅炉为多台，多台热回收焦炉通过管道并联，热回收焦炉与焦炉余热锅炉台数相同，一台热回收焦炉对应一台焦炉余热锅炉；热回收焦炉的炉顶集气管通过高温烟气管与焦炉余热锅炉相连，高温烟气管设有高温烟气旁路与事故放散烟囱相连；焦炉余热锅炉通过第一低温烟气管与烟气净化装置相连，烟气净化装置与烟囱管道相连。
所述高温烟气管上设有锅炉烟气进口电动切断阀，高温烟气旁路上设有烟囱烟气进口电动切断阀与高温烟气旁路电动切断阀，第一低温烟气管上设有锅炉烟气出口电动切断阀。
还包括引风机，烟气净化装置通过第二低温烟气管与引风机相连，引风机通过第三低温烟气管与烟囱相连。
所述焦炉余热锅炉为多台，多台焦炉余热锅炉共用一座事故放散烟囱。
一种基于热回收焦炉的烟气工艺，具体包括：
1)热回收焦炉产生的高温烟气首先进入布置于炉顶的炉顶集气管，高温烟气温度为1050～1150℃，然后通过与炉顶集气管联通的高温烟气管道进入焦炉余热锅炉进行换热，换热后的低温烟气依次经第一低温烟气管、烟气净化装置、第二低温烟气管、引风机、第三低温烟气管后进入烟囱放散；低温烟气温度为165～180℃；
2)正常工况下焦炉余热锅炉以额定参数运行，高温烟气旁路电动切断阀及烟囱烟气进口电动切断阀关断，当任何一台焦炉余热锅炉事故或检修时，关断相应的高温烟气管上的锅炉烟气进口电动切断阀及第一低温烟气管上的锅炉烟气出口电动切断阀，打开相应的高温烟气旁路上的高温烟气旁路电动切断阀和烟囱烟气进口电动切断阀，将对应焦炉余热锅炉的热回收焦炉产生的高温烟气通过事故放散烟囱放散。
与现有技术相比，本发明的有益效果是：
1)本发明能够切掉事故检修的焦炉余热锅炉，合理配置焦炉余热锅炉的设备能力，灵活操作配套焦炉余热锅炉的运行，配置多台焦炉余热锅炉可以做到高温烟气不放散，配置2台焦炉余热锅炉可以做到高温烟气少放散，有效回收余热，保护环境，创造良好的经济效益和社会效益。
2)本发明可以使多台焦炉余热锅炉并联运行，统一考虑后续余热利用设备配置，节省设备占地、减少设备投资、简化生产操作、生产操作灵活。
3)本发明通过高温烟气旁路及高温烟气旁路电动切断阀的开关可将每个热回收焦炉产生的烟气送至事故放散烟囱放散，不用一组焦炉设置一个事故放散烟囱，减少事故放散烟囱的设置，节省投资，节省占地。
4)本发明所述的烟气系统适用于各种新建、改建、扩建的热回收焦炉烟气系统。
图1是本发明结构示意及工艺流程图。
图中：1-热回收焦炉 2-焦炉余热锅炉 3-烟气净化装置 4-引风机 5-烟囱 6-事故放散烟囱 7-炉顶集气管 8-高温烟气管 9-第一低温烟气管 10-第二低温烟气管 11-第三低温烟气管 12-高温烟气旁路 13-锅炉烟气进口电动切断阀 14-烟囱烟气进口电动切断阀 15-高温烟气旁路电动切断阀 16-锅炉烟气出口电动切断阀
下面结合附图对本发明的具体实施方式作进一步说明：
实施例：
如图1所示，一种基于热回收焦炉的烟气系统，包括2台热回收焦炉1、2台焦炉余热锅炉2、1台烟气净化装置3、烟囱5、事故放散烟囱6，高温烟气管8、第一低温烟气管9、第二低温烟气管10、第三低温烟气管11、高温烟气管12、锅炉烟气进口电动切断阀13、烟囱烟气进口电动切断阀14、高温烟气旁路电动切断阀15与锅炉烟气出口电动切断阀16。2台热回收焦炉1通过管道并联，热回收焦炉1与焦炉余热锅炉2台数相同，一台热回收焦炉1对应一台焦炉余热锅炉2。
热回收焦炉1的炉顶集气管7通过高温烟气管8与焦炉余热锅炉2相连，高温烟气管8设有高温烟气旁路12与事故放散烟囱6相连；焦炉余热锅炉2通过第一低温烟气管9与烟气净化装置3相连，烟气净化装置3通过第二低温烟气管10与引风机4相连，引风机4通过第三低温烟气管11与烟囱5相连。
高温烟气管8上设有锅炉烟气进口电动切断阀13，高温烟气旁路12上设有烟囱烟气进口电动切断阀14与高温烟气旁路电动切断阀15，第一低温烟气管9上设有锅炉烟气出口电动切断阀16。
焦炉余热锅炉2为高温高压锅炉，额定蒸汽温度为540℃，额定蒸汽压力为9.81MPa。烟气净化装置3为除尘脱硫脱硝一体化装置。
本实施例为2组热回收焦炉1配置2台焦炉余热锅炉2，2台焦炉余热锅炉2共用一座事故放散烟囱6和一座烟囱5。
一种基于热回收焦炉的烟气工艺，具体包括：
1)热回收焦炉1产生的高温烟气进入布置于炉顶的炉顶集气管7，烟气温度为1050～1150℃，然后通过与炉顶集气管7联通的高温烟气管道8进入焦炉余热锅炉2进行换热，换热后温度为165～180℃的低温烟气依次经第一低温烟气管9、烟气净化装置3、第二低温烟气管10、引风机4、第三低温烟气管11后进入烟囱5放散，烟气温度为≈80℃。
2)每两座热回收焦炉为一组，一组热回收焦炉1对应一座焦炉余热锅炉2，正常工况下焦炉余热锅炉2以额定参数运行，高温烟气旁路电动切断阀15及烟囱烟气进口电动 切断阀14关断，当任何一台焦炉余热锅炉2事故或检修时，关断相应的高温烟气管8上的锅炉烟气进口电动切断阀13及第一低温烟气管9上的锅炉烟气出口电动切断阀16，打开相应的高温烟气旁路12上的高温烟气旁路电动切断阀15和烟囱烟气进口电动切断阀14，将对应焦炉余热锅炉2的热回收焦炉1产生的高温烟气通过事故放散烟囱6放散。
本发明不局限于2组热回收焦炉1配置2台焦炉余热锅炉2，当多组热回收焦炉1配置多台焦炉余热锅炉2时，其中任何一台焦炉余热锅炉2事故或检修时，关断相应的高温烟气管8上的锅炉烟气进口电动切断阀13及第一低温烟气管9上的锅炉烟气出口电动切断阀16，打开相应的高温烟气旁路12上的高温烟气旁路电动切断阀15，关闭烟囱烟气进口电动切断阀14，将事故检修的焦炉余热锅炉2对应的热回收焦炉1产生的高温烟气通过高温烟气旁路12分配给剩余的焦炉余热锅炉2，最终，多组热回收焦炉1产生的高温烟气可以与剩余焦炉余热锅炉2完全换热，则烟气不必通过事故放散烟囱6放散，灵活操作配套焦炉余热锅炉的运行。
本发明能将事故焦炉余热锅炉切掉，利用剩余焦炉余热锅炉回收高温烟气余热，使事故局部化，不影响系统整体运行，有效回收高温烟气余热，所有焦炉余热锅炉2统一设置一个事故放散烟囱6，减少投资占地，焦炉余热锅炉2不局限于布置在两座热回收焦炉1之间、不局限于熄焦车两侧均布置热回收焦炉1方可布置焦炉余热锅炉2，布置方案灵活，检修方便。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。
Claims (7)
- 一种基于热回收焦炉的烟气系统，其特征在于：包括热回收焦炉、焦炉余热锅炉、烟气净化装置、烟囱、事故放散烟囱；所述热回收焦炉、焦炉余热锅炉为多台，多台热回收焦炉通过管道并联，热回收焦炉与焦炉余热锅炉台数相同，一台热回收焦炉对应一台焦炉余热锅炉；热回收焦炉的炉顶集气管通过高温烟气管与焦炉余热锅炉相连，高温烟气管设有高温烟气旁路与事故放散烟囱相连；焦炉余热锅炉通过第一低温烟气管与烟气净化装置相连，烟气净化装置与烟囱管道相连。
- 根据权利要求1所述的一种基于热回收焦炉的烟气系统，其特征在于：所述高温烟气管上设有锅炉烟气进口电动切断阀，高温烟气旁路上设有烟囱烟气进口电动切断阀与高温烟气旁路电动切断阀，第一低温烟气管上设有锅炉烟气出口电动切断阀。
- 根据权利要求1所述的一种基于热回收焦炉的烟气系统，其特征在于：还包括引风机，烟气净化装置通过第二低温烟气管与引风机相连，引风机通过第三低温烟气管与烟囱相连。
- 根据权利要求1所述的一种基于热回收焦炉的烟气系统，其特征在于：所述多台焦炉余热锅炉共用一座事故放散烟囱。
- 一种基于权利要求1或2或3或4所述的基于热回收焦炉的烟气系统的工艺，其特征在于，具体包括：1)热回收焦炉产生的高温烟气首先进入布置于炉顶的炉顶集气管，然后通过与炉顶集气管联通的高温烟气管道进入焦炉余热锅炉进行换热，换热后的低温烟气依次经第一低温烟气管、烟气净化装置、第二低温烟气管、引风机、第三低温烟气管后进入烟囱放散；2)正常工况下焦炉余热锅炉以额定参数运行，高温烟气旁路电动切断阀及烟囱烟气进口电动切断阀关断，当任何一台焦炉余热锅炉事故或检修时，关断相应的高温烟气管上的锅炉烟气进口电动切断阀及第一低温烟气管上的锅炉烟气出口电动切断阀，打开相应的高温烟气旁路上的高温烟气旁路电动切断阀和烟囱烟气进口电动切断阀，将对应焦炉余热锅炉的热回收焦炉产生的高温烟气通过事故放散烟囱放散。
- 根据权利要求5所述的基于热回收焦炉的烟气工艺，其特征在于，所述1)高温烟气温度为1050～1150℃。
- 根据权利要求5所述的基于热回收焦炉的烟气工艺，其特征在于，所述1)低温 烟气温度为165～180℃。
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