CN204574092U - Boiler tail flue gas waste heat complicated utilization system - Google Patents
Boiler tail flue gas waste heat complicated utilization system Download PDFInfo
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- CN204574092U CN204574092U CN201420754341.3U CN201420754341U CN204574092U CN 204574092 U CN204574092 U CN 204574092U CN 201420754341 U CN201420754341 U CN 201420754341U CN 204574092 U CN204574092 U CN 204574092U
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- flue gas
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- water heat
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000003546 flue gas Substances 0.000 title claims abstract description 29
- 239000002918 waste heat Substances 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000012736 aqueous medium Substances 0.000 claims 3
- 230000001172 regenerating effect Effects 0.000 claims 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical group [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000008021 deposition Effects 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- 230000023556 desulfurization Effects 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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
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- Air Supply (AREA)
Abstract
锅炉尾部烟气余热复合利用系统，它包括：至少一空气预热器，至少一烟气—水换热省煤器，至少一空气—水换热暖风器，以及将所述空气预热器与换热器连接在一起的连接管；所述烟气-水换热省媒器布置于空气预热器之后，空气预热器出口的烟气通过烟气-水换热器的吸热后，烟气被排出,将烟气余热利用于提高冷风风温和凝结水温度；所述空气-水换热暖风器通过水介质对冷风进行加热；它具有提高冷风温度，缓解硫酸氢铵沉积，降低排烟温度，提高锅炉效率，加热凝结水，节约脱硫系统用水等特点。
A composite utilization system for flue gas waste heat at the boiler tail, which includes: at least one air preheater, at least one flue gas-water heat exchange economizer, at least one air-water heat exchange heater, and the air preheater A connecting pipe connected with the heat exchanger; the flue gas-water heat exchange economizer is arranged after the air preheater, and the flue gas at the outlet of the air preheater passes through the heat absorbed by the flue gas-water heat exchanger , the flue gas is discharged, and the waste heat of the flue gas is used to increase the temperature of the cold air and the temperature of the condensed water; the air-water heat exchange heater heats the cold air through the water medium; it can increase the temperature of the cold air, alleviate the deposition of ammonium bisulfate, Reduce exhaust gas temperature, improve boiler efficiency, heat condensed water, save water for desulfurization system, etc.
Description
技术领域 technical field
本方案研究涉及的是一种锅炉尾部烟气余热复合利用系统，属于火力发电厂设计技术领域。 The program research involves a boiler tail flue gas waste heat composite utilization system, which belongs to the technical field of thermal power plant design.
背景技术 Background technique
目前的火力发电厂，为了改善污染排放现状，均会加装脱硝等装置。锅炉加装脱硝装置后，由于氨逃逸现象的存在，就不可避免的会在空预器上发生硫酸氢铵沉积，长期运行势必导致空预器阻力增加，风机电耗率增加，因此需增加空预器入口冷风温度来减少硫酸氢氨的沉积。同时，机组节能降耗的要求日益提高，为进一步降低能耗提高机组效率，对现有的锅炉尾部烟气利用系统提出了更高的要求。 In order to improve the status quo of pollution discharge, the current thermal power plants will be equipped with denitrification and other devices. After the boiler is equipped with a denitrification device, due to the existence of ammonia escape, ammonium bisulfate deposition will inevitably occur on the air preheater. Long-term operation will inevitably lead to an increase in air preheater resistance and fan power consumption. The cold air temperature at the inlet of the preheater is used to reduce the deposition of ammonium bisulfate. At the same time, the requirements for energy saving and consumption reduction of the unit are increasing day by day. In order to further reduce energy consumption and improve unit efficiency, higher requirements are put forward for the existing flue gas utilization system at the tail of the boiler.
发明内容 Contents of the invention
本实用新型的目的在于缓解硫酸氢铵沉积，提高机组效率，而提供一种结构组成简单，运行方便、可靠，既提高了空预器入口冷风温度，缓解了硫酸氢铵沉积，同时还可以降低排烟温度，加热凝结水，提高机组效率的火力发电厂锅炉尾部烟气余热复合利用系统。 The purpose of the utility model is to alleviate the deposition of ammonium bisulfate and improve the efficiency of the unit, and provide a structure with simple composition, convenient and reliable operation, which not only improves the temperature of the cold air at the inlet of the air preheater, alleviates the deposition of ammonium bisulfate, but also reduces the Exhaust gas temperature, heating condensed water, and improving the efficiency of the thermal power plant boiler tail flue gas waste heat composite utilization system.
本实用新型的目的是通过如下技术方案来完成的，它包括：至少一空气预热器，至少一烟气—水换热省煤器，至少一空气—水换热暖风器，以及将所述空气预热器与换热器连接在一起的连接管。 The purpose of this utility model is accomplished through the following technical solutions, which include: at least one air preheater, at least one flue gas-water heat exchange economizer, at least one air-water heat exchange heater, and the The connecting pipe connecting the air preheater and the heat exchanger.
所述烟气-水换热省媒器布置于空气预热器之后，空气预热器出口的烟气通过烟气-水换热省媒器的吸热后，烟气被排出。此换热器采用逆流换热型式，内部布置有垂直管换热流道或水平管换热流道。 The flue gas-water heat exchange economizer is arranged behind the air preheater, and the flue gas at the outlet of the air preheater is discharged after being absorbed by the flue gas-water heat exchange economizer. This heat exchanger adopts the type of counter-current heat exchange, and the interior is arranged with vertical tube heat exchange channels or horizontal tube heat exchange channels.
所述空气-水换热暖风器布置于空气预热器与风机间，冷风（一次冷风或二次冷风或两者组合，下同）通过空气-水换热暖风器被加热。同时烟气-水换热省媒器与空气-水换热暖风器之间以水介质循环换热。 The air-water heat exchange heater is arranged between the air preheater and the fan, and the cold air (primary cold air or secondary cold air or a combination of both, the same below) is heated by the air-water heat exchange heater. At the same time, the flue gas-water heat exchange economizer and the air-water heat exchange heater use water medium to circulate heat.
所述的换热器中水介质来自于汽机凝结水系统，即对汽机某级加热器出口的凝结水通入烟气-水换热省媒器与烟气进行换热，烟气-水换热器出口设置分流口，大部分水介质进入空气-水换热暖风器，对冷风进行加热，另一部分水介质进入凝结水系统。 The water medium in the heat exchanger comes from the condensed water system of the steam turbine, that is, the condensed water at the outlet of a certain stage heater of the steam turbine is passed into the flue gas-water heat exchange economizer to exchange heat with the flue gas, and the flue gas-water exchange A split port is set at the outlet of the heater, most of the water medium enters the air-water heat exchange heater to heat the cold air, and the other part of the water medium enters the condensate system.
本实用新型具有如下技术效果： The utility model has the following technical effects:
一是提高了冷风温度，提高锅炉效率，同时缓解了硫酸氢铵沉积。 One is to increase the temperature of the cold air, improve the efficiency of the boiler, and at the same time alleviate the deposition of ammonium bisulfate.
二是烟气换热器的部分热量用来加热汽机低压加热系统, 提高了机组的热经济性,降低供电煤耗率。 Second, part of the heat from the flue gas heat exchanger is used to heat the low-pressure heating system of the steam turbine, which improves the thermal economy of the unit and reduces the coal consumption rate for power supply.
三是因烟气温度降低，进入脱硫吸收塔的烟气量减少，节约了大量脱硫系统用水。 Third, due to the lowering of flue gas temperature, the amount of flue gas entering the desulfurization absorption tower is reduced, saving a lot of water in the desulfurization system.
附图说明 Description of drawings
图1是本实用新型所述烟气余热复合利用系统的示意图。 Fig. 1 is a schematic diagram of the composite utilization system of flue gas waste heat described in the present invention.
具体实施方式 Detailed ways
下面结合附图以及各方案计算分析对比，对本实用新型作详细的介绍： Below in conjunction with accompanying drawing and each scheme calculation analysis contrast, the utility model is done detailed introduction:
烟气余热复合利用系统方主要包括：空气预热器（1）、烟气—水换热省煤器（2）和空气—水换热暖风器（3）三个主要设备。 The flue gas waste heat composite utilization system mainly includes three main equipment: air preheater (1), flue gas-water heat exchange economizer (2) and air-water heat exchange heater (3).
所述烟气-水换热器（2）布置于空气预热器（1）之后，空气预热器（1）出口的烟气通过烟气-水换热器（2）的换热后，烟气被排出。此换热器采用逆流换热型式，内部布置有垂直管换热流道或水平管换热流道。 The flue gas-water heat exchanger (2) is arranged after the air preheater (1), and the flue gas at the outlet of the air preheater (1) passes through the heat exchange of the flue gas-water heat exchanger (2), Fumes are expelled. This heat exchanger adopts the type of counter-current heat exchange, and the interior is arranged with vertical tube heat exchange channels or horizontal tube heat exchange channels.
所述空气-水换热器（3）布置于空气预热器与风机间，冷风通过空气-水换热器（3）被加热。同时烟气-水换热器（2）与空气-水换热器（3）之间以水介质循环换热。 The air-water heat exchanger (3) is arranged between the air preheater and the fan, and the cold air is heated through the air-water heat exchanger (3). At the same time, water medium is used to circulate heat between the flue gas-water heat exchanger (2) and the air-water heat exchanger (3).
所述的换热器中水介质来自于汽机低加系统，即对汽机某级低压加热器出口的凝结水通入烟气-水换热器（2）对烟气进行冷却，烟气-水换热器（2）水侧出口设置分流口，大部分水介质进入空气-水换热器（3），另一部分水介质进入凝结水系统。 The water medium in the heat exchanger comes from the low-pressure heating system of the turbine, that is, the condensed water at the outlet of a low-pressure heater of a certain stage of the turbine is passed into the flue gas-water heat exchanger (2) to cool the flue gas, and the flue gas-water The outlet of the water side of the heat exchanger (2) is provided with a split port, most of the water medium enters the air-water heat exchanger (3), and the other part of the water medium enters the condensate system.
实施例： Example:
图1所示，本实用新型系统主要包括空气预热器（1）、烟气—水换热省煤器（2）和空气—水换热暖风器（3）三个主要设备，以及互相之间的连接。 As shown in Figure 1, the utility model system mainly includes three main equipments: air preheater (1), flue gas-water heat exchange economizer (2) and air-water heat exchange heater (3), as well as mutual the connection between.
以某百万电厂为例，通过烟气—水换热器（2），吸收空气预热器（1）出口的烟气热量，将排烟温度从157℃降低到90℃，水介质温度从70℃加热到120℃。烟气—水换热器（2）出口的120℃热水再去加热空气预热器（1）入口前的二次风，将二次风从25℃加热到100℃，剩余热量用于加热汽轮机回热系统中的凝结水。: Taking a million-dollar power plant as an example, through the flue gas-water heat exchanger (2), the heat of the flue gas at the outlet of the air preheater (1) is absorbed, the exhaust gas temperature is reduced from 157°C to 90°C, and the temperature of the water medium is reduced from Heating from 70°C to 120°C. The 120°C hot water at the outlet of the flue gas-water heat exchanger (2) is used to heat the secondary air before the inlet of the air preheater (1), heating the secondary air from 25°C to 100°C, and the remaining heat is used for heating Condensate in steam turbine recuperation system. :
以某百万电厂为例，按初步计算，供电标煤耗比常规机组降低约2.4g/kw.h。按机组年运行5500小时计，每台机组每年耗煤量用可节省约13200吨，约1000万元。 Taking a million-dollar power plant as an example, according to preliminary calculations, the standard coal consumption for power supply is about 2.4g/kw.h lower than that of conventional units. Based on 5,500 hours of annual unit operation, the annual coal consumption of each unit can save about 13,200 tons, or about 10 million yuan.
本实用新型是基于降低供电标煤耗以及安全运行的思路而提出的技术方案，该方案满足国家节能降耗的政策要求及最新的环保排放标准。 The utility model is a technical solution based on the idea of reducing the standard coal consumption of power supply and safe operation, and the solution meets the national policy requirements of energy saving and consumption reduction and the latest environmental protection emission standards.
本实用新型将空气预热器出口烟气，通过水媒换热器，降低排烟温度，利用烟气的热量提高冷风温度，提高锅炉效率，并加热回热系统凝结水。 The utility model passes the flue gas at the outlet of the air preheater through the water-medium heat exchanger to reduce the exhaust gas temperature, utilizes the heat of the flue gas to increase the temperature of the cold air, improves the efficiency of the boiler, and heats the condensed water of the heat recovery system.
考虑到低温腐蚀的影响，本实用新型所述的烟气换热器壳体采用ND钢（09CrCuSb），侧面及底部与冲洗水接触部分增加镍基合金衬板。换热管全部采用ND钢。 Considering the impact of low-temperature corrosion, the shell of the flue gas heat exchanger described in the utility model is made of ND steel (09CrCuSb), and nickel-based alloy lining plates are added to the parts in contact with the flushing water on the side and bottom. All heat exchange tubes are made of ND steel.
本实用新型所述的烟气换热器由壳体和鳍片管和组成；鳍片管内的凝结水接自汽机低加系统。 The flue gas heat exchanger described in the utility model is composed of a shell and a finned tube; the condensed water in the finned tube is connected to the low heating system of the steam turbine.
考虑到低温腐蚀的影响，所述的烟气-水换热器设备、空气-水换热器设备关键部件及需防腐设计。 Considering the impact of low-temperature corrosion, the key components of the flue gas-water heat exchanger equipment and air-water heat exchanger equipment and anti-corrosion design are required.
Claims (5)
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| CN201420754341.3U CN204574092U (en) | 2014-12-05 | 2014-12-05 | Boiler tail flue gas waste heat complicated utilization system |
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| CN201420754341.3U CN204574092U (en) | 2014-12-05 | 2014-12-05 | Boiler tail flue gas waste heat complicated utilization system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105627289A (en) * | 2016-03-16 | 2016-06-01 | 天津爱尔普科技发展有限公司 | Low-temperature economizer combined air heater cyclic utilization system |
| CN106052471A (en) * | 2016-05-26 | 2016-10-26 | 新疆宜化化工有限公司 | Method for preventing resistance of air preheater from rising |
| CN110440241A (en) * | 2019-08-27 | 2019-11-12 | 东方电气集团东方锅炉股份有限公司 | A kind of air series connection heating system promoting boiler efficiency |
-
2014
- 2014-12-05 CN CN201420754341.3U patent/CN204574092U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105627289A (en) * | 2016-03-16 | 2016-06-01 | 天津爱尔普科技发展有限公司 | Low-temperature economizer combined air heater cyclic utilization system |
| CN106052471A (en) * | 2016-05-26 | 2016-10-26 | 新疆宜化化工有限公司 | Method for preventing resistance of air preheater from rising |
| CN110440241A (en) * | 2019-08-27 | 2019-11-12 | 东方电气集团东方锅炉股份有限公司 | A kind of air series connection heating system promoting boiler efficiency |
| CN110440241B (en) * | 2019-08-27 | 2024-02-20 | 东方电气集团东方锅炉股份有限公司 | Air series heating system capable of improving boiler efficiency |
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| C14 | Grant of patent or utility model | ||
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Address after: No. 68 GUCUI Road, Hangzhou, Zhejiang Province Patentee after: CHINA ENERGY ENGINEERING GROUP ZHEJIANG ELETERIC POWER DESIGN INSTITUTE Co.,Ltd. Address before: No. 68 GUCUI Road, Hangzhou, Zhejiang Province Patentee before: Zhejiang Electric Power Design Inst. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150819 |