CN202056856U - System for recycling afterheat of flue gas through high-temperature coal economizer - Google Patents
System for recycling afterheat of flue gas through high-temperature coal economizer Download PDFInfo
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- CN202056856U CN202056856U CN2011200834096U CN201120083409U CN202056856U CN 202056856 U CN202056856 U CN 202056856U CN 2011200834096 U CN2011200834096 U CN 2011200834096U CN 201120083409 U CN201120083409 U CN 201120083409U CN 202056856 U CN202056856 U CN 202056856U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title abstract description 37
- 239000003546 flue gas Substances 0.000 title abstract description 37
- 239000003245 coal Substances 0.000 title description 3
- 238000004064 recycling Methods 0.000 title 1
- 239000012717 electrostatic precipitator Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 4
- 239000003517 fume Substances 0.000 claims 3
- 239000002918 waste heat Substances 0.000 abstract description 18
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000001035 drying Methods 0.000 abstract description 4
- 239000003077 lignite Substances 0.000 abstract description 4
- 238000010612 desalination reaction Methods 0.000 abstract description 2
- 239000013535 sea water Substances 0.000 abstract description 2
- 230000001172 regenerating effect Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
本实用新型属于锅炉节能与褐煤干燥技术领域，具体涉及一种利用高温省煤器回收烟气余热的系统。省煤器烟气出口分为两路：一路接入空气预热器，另一路经过旁路烟道进入高温省煤器，高温烟气在高温省煤器中加热工质，回收的烟气余热可用于汽轮机回热加热器、锅炉暖风器、热网供热、海水淡化等用途；高温省煤器的出口管路与空气预热器的出口管路连通后接入静电除尘器的入口。该系统利用锅炉空气预热器前的部分高温烟气该技术利用高温省煤器回收利用了锅炉部分高温烟气余热，降低了排烟温度，减小了排烟损失，实现了锅炉机组的节能减排。
The utility model belongs to the technical field of boiler energy saving and lignite drying, in particular to a system for recovering waste heat of flue gas by using a high-temperature economizer. The flue gas outlet of the economizer is divided into two paths: one path is connected to the air preheater, and the other path enters the high-temperature economizer through the bypass flue. The high-temperature flue gas heats the working medium in the high-temperature economizer, and the recovered flue gas waste heat It can be used for steam turbine regenerative heaters, boiler heaters, heat network heating, seawater desalination, etc.; the outlet pipeline of the high-temperature economizer is connected to the outlet pipeline of the air preheater and then connected to the inlet of the electrostatic precipitator. The system utilizes part of the high-temperature flue gas before the boiler air preheater. This technology uses the high-temperature economizer to recycle part of the high-temperature flue gas waste heat of the boiler, which reduces the exhaust gas temperature and exhaust gas loss, and realizes the energy saving of the boiler unit. emission reduction.
Description
技术领域 technical field
本实用新型属于锅炉节能与褐煤干燥技术领域，具体涉及一种利用高温省煤器回收烟气余热的系统。The utility model belongs to the technical field of boiler energy saving and lignite drying, in particular to a system for recovering waste heat of flue gas by using a high-temperature economizer.
背景技术 Background technique
目前，大型火电机组的节能减排是国家目前的重要国策。电站锅炉排烟热损失是发电机组主要热损失之一。开发电站锅炉烟气余热利用技术，对降低锅炉排烟温度，减少机组热损失，提高机组运行经济性，降低二氧化碳、氮氧化物、硫氧化物等污染物的排放，有着重要的工程实用价值。At present, the energy saving and emission reduction of large thermal power units is an important national policy of the country. The heat loss of power plant boiler exhaust smoke is one of the main heat losses of generating units. The development of power plant boiler flue gas waste heat utilization technology has important engineering practical value for reducing boiler exhaust temperature, reducing unit heat loss, improving unit operation economy, and reducing emissions of carbon dioxide, nitrogen oxides, sulfur oxides and other pollutants.
烟气余热利用技术的原理是利用布置在锅炉尾部烟道上的烟气余热回收装置，回收烟气余热并应用于锅炉侧、汽机侧或其它系统，降低锅炉排烟温度，减小锅炉热损失，提高火力发电机组运行经济性，达到节能减排目的。The principle of flue gas waste heat utilization technology is to use the flue gas waste heat recovery device arranged on the flue at the tail of the boiler to recover the waste heat of the flue gas and apply it to the boiler side, turbine side or other systems to reduce the temperature of the boiler exhaust gas and reduce the heat loss of the boiler. Improve the operating economy of thermal power generating units to achieve the purpose of energy saving and emission reduction.
考虑到锅炉制粉系统对热风温度的限制，需要在制粉系统入口掺冷风维持磨煤机出口一次风温，导致空气预热器吸收烟气热量受限制，锅炉排烟温度较高的现状，采用高温省煤器利用空气预热器前的部分烟气余热。Considering the limitation of the boiler pulverizing system on the hot air temperature, it is necessary to mix cold air at the inlet of the pulverizing system to maintain the primary air temperature at the outlet of the coal mill, resulting in the limitation of the heat absorbed by the air preheater and the high exhaust temperature of the boiler. A high-temperature economizer is used to utilize part of the waste heat of the flue gas before the air preheater.
发明内容 Contents of the invention
本实用新型为减少电站锅炉排烟热损失，提供了一种利用高温省煤器回收烟气余热的系统。The utility model provides a system for recovering waste heat of flue gas by using a high-temperature economizer to reduce the heat loss of flue gas exhausted by boilers in power stations.
本实用新型采用的技术方案如下：The technical scheme that the utility model adopts is as follows:
省煤器烟气出口分为两路：一路接入空气预热器，另一路经过旁路烟道进入高温省煤器，回收部分烟气余热；高温省煤器的出口管路与空气预热器的出口管路连通后接入静电除尘器的入口。The flue gas outlet of the economizer is divided into two paths: one path is connected to the air preheater, and the other path enters the high-temperature economizer through the bypass flue to recover part of the waste heat of the flue gas; the outlet pipeline of the high-temperature economizer is connected to the air preheater The outlet pipeline of the device is connected to the inlet of the electrostatic precipitator.
所述省煤器出口与高温省煤器入口之间设置旁路截止阀门，用于将褐煤干燥系统解列。A bypass cut-off valve is set between the outlet of the economizer and the inlet of the high-temperature economizer to disconnect the lignite drying system.
所述高温省煤器出口与静电除尘装置之间的管路上设置旁路调节阀门，用于调整通过褐煤干燥滚筒的烟气量。A bypass regulating valve is provided on the pipeline between the outlet of the high-temperature economizer and the electrostatic precipitator to adjust the amount of flue gas passing through the lignite drying drum.
本实用新型的有益效果为：The beneficial effects of the utility model are:
(1)高温省煤器回收的烟气余热品质高：高温省煤器布置在空气预热器前，进口烟气温度高，高温省煤器工质出口温度高于常规低压低温省煤器，能够得到高品位的余热，扩展了余热利用的途径。例如余热利用于回热系统时，可以加热温度较高的凝结水；当用于加热热网水时，可以增加更大的供热面积。特别是对于采用空冷技术的机组，如果采用常规低压低温省煤器，由于凝结水温度较高，烟气余热回收设备传热温压较小，低压省煤器换热面积较大。如果采用高温省煤器，就可以提高传热温压，减少换热面积。(1) The flue gas waste heat recovered by the high-temperature economizer is of high quality: the high-temperature economizer is arranged in front of the air preheater, the inlet flue gas temperature is high, and the working fluid outlet temperature of the high-temperature economizer is higher than that of the conventional low-pressure low-temperature economizer. High-grade waste heat can be obtained, which expands the way of waste heat utilization. For example, when the waste heat is used in the heat recovery system, it can heat the condensed water with a higher temperature; when it is used to heat the water in the heating network, a larger heating area can be increased. Especially for units using air-cooling technology, if a conventional low-pressure low-temperature economizer is used, due to the high temperature of condensate water, the heat transfer temperature and pressure of the flue gas waste heat recovery equipment are small, and the heat transfer area of the low-pressure economizer is large. If a high-temperature economizer is used, the heat transfer temperature and pressure can be increased and the heat transfer area can be reduced.
(2)采用高温省煤器可降低烟气侧新增流动阻力：流经高温省煤器的烟气来源于空气预热器前烟道的旁路系统，该部分烟气不通过空气预热器，流经高温省煤器增加的阻力与不流经空气预热器减小的阻力部分抵消，降低风机电耗，使烟气余热利用技术的经济效益更加明显。(2) The use of high-temperature economizer can reduce the new flow resistance on the flue gas side: the flue gas flowing through the high-temperature economizer comes from the bypass system of the flue before the air preheater, and this part of the flue gas is not preheated by air The resistance increased by flowing through the high-temperature economizer is partially offset by the reduced resistance not flowing through the air preheater, reducing the power consumption of the fan and making the economic benefits of flue gas waste heat utilization technology more obvious.
(3)高温省煤器中传热温压高：高温省煤器中烟气来源于空气预热器前的旁路，其进口烟气温度(380～400℃左右)，远远大于常规脱硫系统增压风机前的烟气温度(120～150℃左右)。较大的传热温压对应较小的换热面积，会使省煤器结构紧凑，节省投资和方便布置。(3) High heat transfer, temperature and pressure in the high-temperature economizer: the flue gas in the high-temperature economizer comes from the bypass in front of the air preheater, and its inlet flue gas temperature (about 380-400°C) is much higher than that of conventional desulfurization Flue gas temperature in front of the booster fan of the system (about 120-150°C). Larger heat transfer temperature and pressure correspond to smaller heat transfer area, which will make the economizer compact in structure, save investment and facilitate layout.
(4)高温省煤器投资成本低：高温省煤器入口烟气温度远高于酸露点，当锅炉燃用高硫煤时，可不考虑受热面低温腐蚀以，受热面材料可为碳钢，节省投资成本。(4) Low investment cost of high-temperature economizer: the flue gas temperature at the inlet of high-temperature economizer is much higher than the acid dew point. When the boiler burns high-sulfur coal, low-temperature corrosion of the heating surface can be ignored. The material of the heating surface can be carbon steel. Save investment costs.
(5)高温省煤器采用扩展受热面优化设计，提高换热效率，有效减小磨损和积灰。省煤器采用鳍片管、螺旋肋片管、H型鳍片管等扩展受热面强化传热，并优化烟气通流部分设计，选取合理的烟气流速，有效防止磨损。高温省煤器中需装设吹灰装置。(5) The high-temperature economizer adopts the optimized design of extended heating surface to improve heat exchange efficiency and effectively reduce wear and dust accumulation. The economizer adopts finned tubes, spiral finned tubes, H-shaped finned tubes, etc. to expand the heating surface to enhance heat transfer, and optimize the design of the flue gas flow part, select a reasonable flue gas flow rate, and effectively prevent wear. A soot blowing device shall be installed in the high temperature economizer.
附图说明 Description of drawings
图1为本发明的系统示意图。Fig. 1 is a schematic diagram of the system of the present invention.
1-省煤器；2-空气预热器；3-高温省煤器；4-旁路调节阀门；5-旁路截止阀门；6-静电除尘器；7-引风机；8-增压风机；9-脱硫塔；10-烟囱。1- economizer; 2- air preheater; 3- high temperature economizer; 4- bypass regulating valve; 5- bypass cut-off valve; 6- electrostatic precipitator; 7- induced draft fan; 8- booster fan ; 9-sweeping tower; 10-chimney.
具体实施方式 Detailed ways
本实用新型提供了一种利用高温省煤器回收烟气余热的系统，下面结合附图和具体实施方式对本发明的技术方案作进一步的说明。The utility model provides a system for recovering waste heat of flue gas by using a high-temperature economizer. The technical solution of the invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.
如图1所示，省煤器1出口的高温烟气一部分进入空气预热器2，另一部分经过旁路烟道进入高温省煤器3，高温省煤器中工质吸收烟气热量后可用于汽轮机回热加热器、锅炉暖风器、热网供热、海水淡化等用途。高温省煤器3出口的烟气与空气预热器2出口的烟气混合后进入静电除尘器6，然后通过引风机7、增压风机8、脱硫塔9进入烟囱10。在省煤器1出口与高温省煤器3入口之间设置旁路截止阀门5，用于将高温省煤器解列。在高温省煤器3出口与静电除尘装置6之间的管路上设置旁路调节阀门4，用于调整通过高温省煤器的烟气量。可以在不影响锅炉运行的前提下，对高温省煤器进行停运和检修等作业。As shown in Figure 1, part of the high-temperature flue gas at the outlet of economizer 1 enters the air preheater 2, and the other part enters the high-temperature economizer 3 through the bypass flue. The working fluid in the high-temperature economizer absorbs the heat of the flue gas and can be used It is used for steam turbine recuperation heater, boiler heater, heating network heating, seawater desalination, etc. The flue gas at the outlet of the high-temperature economizer 3 is mixed with the flue gas at the outlet of the air preheater 2 and enters the electrostatic precipitator 6, and then enters the
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705809A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Thermal power unit with smoke feed water heater |
| CN102705810A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Device for boiler flue gas waste heat utilization in thermal power unit |
| CN103438427A (en) * | 2013-08-09 | 2013-12-11 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN107655022A (en) * | 2017-11-08 | 2018-02-02 | 江苏格林机械有限公司 | A kind of boiler smoke exhaust system |
-
2011
- 2011-03-25 CN CN2011200834096U patent/CN202056856U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705809A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Thermal power unit with smoke feed water heater |
| CN102705810A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Device for boiler flue gas waste heat utilization in thermal power unit |
| CN103438427A (en) * | 2013-08-09 | 2013-12-11 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN103438427B (en) * | 2013-08-09 | 2015-06-24 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN107655022A (en) * | 2017-11-08 | 2018-02-02 | 江苏格林机械有限公司 | A kind of boiler smoke exhaust system |
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Granted publication date: 20111130 Termination date: 20140325 |