WO2012037828A1 - 节能型除尘器 - Google Patents

节能型除尘器 Download PDF

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Publication number
WO2012037828A1
WO2012037828A1 PCT/CN2011/076210 CN2011076210W WO2012037828A1 WO 2012037828 A1 WO2012037828 A1 WO 2012037828A1 CN 2011076210 W CN2011076210 W CN 2011076210W WO 2012037828 A1 WO2012037828 A1 WO 2012037828A1
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WO
WIPO (PCT)
Prior art keywords
heat
section
energy
flue gas
temperature
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PCT/CN2011/076210
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English (en)
French (fr)
Inventor
钱学略
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上海伏波环保设备有限公司
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Publication date
Application filed by 上海伏波环保设备有限公司 filed Critical 上海伏波环保设备有限公司
Priority to CN2011800431670A priority Critical patent/CN103328891A/zh
Priority to US13/823,948 priority patent/US9416968B2/en
Priority to EP11826355.7A priority patent/EP2620707B1/en
Publication of WO2012037828A1 publication Critical patent/WO2012037828A1/zh

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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
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • 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
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • 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
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • 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
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Definitions

  • the invention relates to a boiler flue gas dedusting technology, in particular to an energy-saving dust collector which reduces the flue gas temperature to improve the dust removal rate.
  • the power plant boiler Or industrial boiler exhaust gas temperature is generally 140 ° C - 160 ° C or higher.
  • the temperature of the smoke has a great influence on the running performance of the electrostatic precipitator.
  • the temperature of the smoke rises, the volume of the flue gas increases, the wind speed of the electric field increases, and the dust removal efficiency decreases.
  • the spark voltage will decrease. Dust removal is not good.
  • the temperature of the smoke directly affects the size of the fly ash specific resistance, the temperature of the smoke decreases, the fly ash ratio becomes smaller, and the dust removal efficiency is improved.
  • the material of the bag filter material is mainly selected according to the temperature range of the flue gas. Therefore, the smoke temperature must be strictly controlled during use, and the temperature of the flue gas should be lowered to the temperature range that the filter bag can withstand for a long period of operation. Ordinary heat exchange equipment may cause acid dew corrosion due to direct heat exchange between flue gas and the required heating medium. Therefore, reducing the inlet flue temperature of the precipitator after use will inevitably corrode the equipment. Therefore, there is a lack of a device that can reduce the temperature of the flue gas and prevent the production of acid dew. Summary of the invention
  • the problem to be solved by the present invention is to provide an energy-saving type dust remover which reduces the temperature of the flue gas and improves the dust removal efficiency, overcoming the above problems in the prior art.
  • An energy-saving dust remover comprising a dust removal device connected to a flue, further comprising a flue gas waste heat recovery and utilization device, disposed in a flue of the front end of the dust removal device, the flue gas waste heat recovery and utilization device comprising a heat exchanger,
  • the heat exchanger comprises a heat absorption section and a heat release section connected to the heat absorption section, the heat absorption section is placed at the flue gas inlet of the dust removal device, and the heat release section is connected to a condensation water pipeline.
  • An electric regulating valve is disposed on the condensed water pipe connected to the heat releasing section of the present invention, and the electric regulating valve is connected to an automatic control device.
  • the heat absorption section of the present invention is provided with a temperature sensor, and the temperature sensor is connected to the automatic control device.
  • the heat absorption section of the present invention is composed of a finned tube filled with working water.
  • the dust removing device of the present invention includes a plurality of dust removing electric fields.
  • the heat absorption section and the heat release section of the heat exchanger of the present invention are connected by a steam pipe and a water return pipe, and the position of the heat release section is higher than the heat absorption section.
  • the energy-saving dust remover of the invention absorbs the temperature of the flue gas by increasing the heat exchanger, and can control and adjust the wall temperature of the device to avoid the acid dew corrosion of the device, so that the dust removal device obtains a good operating condition. , improve dust removal efficiency.
  • electrostatic precipitator the temperature of the flue gas is reduced, the volume of the flue gas is reduced, and the specific resistance of the dust is lowered, so that the dust removal performance is improved. If the temperature of the smoke has a certain temperature drop, the use of less electric field dust collector can achieve more efficiency of the electric field dust collector and save investment cost; for bag dust removal, the temperature of the flue gas can be reduced, which can directly extend the service life of the bag. , reduce operating costs.
  • FIG. 1 Structure diagram of the energy-saving dust collector of the present invention
  • an energy-saving type dust remover of the present invention comprises a dust removing device 8 connected to a flue 1 and a flue gas waste heat recovery utilizing device 2.
  • the flue gas waste heat recovery and utilization device 2 is installed in the flue before the dust removing device 8, the flue gas waste heat recovery and utilization device 2 includes a heat exchanger, and the heat exchanger includes an endothermic section 7 and is connected to the endothermic section.
  • the heat release section 3, the heat absorption section 7 is placed at the flue gas inlet of the dust removal device 8, and the heat absorption section and the heat release section of the heat exchanger are connected by the steam pipe and the return water pipe, and the position of the heat release section is higher than Endothermic section.
  • the heat absorption section 7 is composed of a plurality of finned tubes filled with working water, and the fin tubes absorb the heat of the flue gas to turn the water into water vapor, thereby cooling the flue gas.
  • the heat release section 3 is connected to a condensed water pipe, and the heat release section 3 circulates the water vapor volatilized from the heat absorption section into water by circulating heat of the condensed water.
  • the invention also includes an automatic control device 4 for regulating the condensate flow rate of the heat release section and the wall surface temperature of the heat absorption section.
  • the automatic control unit 4 is connected to the condensate water line via the electric regulating valve 5, and is further connected to the heat exchanger section 3 of the heat exchanger.
  • the automatic control device 4 measures the temperature of the inner wall of the heat absorption section 7 through the temperature sensor 6, and controls the flow rate of the condensed water in the condensed water pipe, and adjusts the temperature by adjusting the flow rate of the condensed water.
  • the flue gas first passes through the heat absorption section 7 of the heat exchanger, and the heat exchanger absorbs the waste heat of the flue gas to lower the flue gas temperature; the latent heat absorbed by the absorbed waste heat to the circulating water or steam, the latent heat of the heat or steam carried by the circulating water After the heat release section 3 exchanges heat with the condensed water, it is supplied to a hot gas desulfurization flue gas reheating system, a heating condensate system, and a heating and heating system.
  • the automatic control device 4 adjusts the electric regulating valve 5 so that the heat is placed
  • the heat transfer amount of the outflow section 3 increases, and the heat transfer amount of the heat release section increases, so that the heat transfer medium in the heat absorption section 7 and the temperature of the flue gas increase, and the heat transfer between the residual heat absorption section and the flue gas is inevitably increased.
  • the flue gas is discharged from the boiler. At this time, the temperature of the flue gas is not soaked to corrode the heating surface of the boiler tail, which is usually about 150 °C. For a boiler with a long running time, the temperature is higher; then the flue gas enters the heat.
  • the heat absorption section of the exchanger is set by the automatic control device to a wall temperature value T higher than the smoke acid dew point, and the outlet smoke temperature of the heat absorption section, that is, the inlet smoke temperature of the dust removal device is T+10 ° C, according to
  • the boiler fuel is different, and the T value is different. Under normal circumstances, the T value is about 100 °C.
  • the automatic control device controls the condensate system to automatically adjust to maintain a constant value of T. Therefore, the operating condition of the dust removal equipment is 110°. C or so, even lower, greatly improve the dust removal efficiency of the dust collector.
  • the dust removal efficiency of the dust collector is improved, and one or several of the dust removal electric fields can be stopped under the premise of meeting the national emission standards; for the newly built project, the degree of smoke temperature reduction is considered in the design of the dust removal equipment. While meeting the dust removal efficiency, the number of electric fields can be appropriately reduced, and the investment cost can be saved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrostatic Separation (AREA)

Description

节能型除尘器 技术领域
本发明涉及锅炉烟气除尘技术， 特别涉及一种降低烟气温度来提高除尘率的节能型除尘 器。 背景技术
由于锅炉燃烧的煤中含有 S 元素， 使得锅炉排放的烟气中含有 S03， S03 不仅可以形成酸 雨污染环境， 而且当烟温过低时和烟气中的水蒸气结露腐蚀设备， 因此电厂锅炉或工业锅炉 排烟温度一般 140°C— 160°C或更高。 烟温对电除尘器的运行性能有较大影响， 一方面， 烟温 上升， 烟气体积增加， 使电场风速提高， 除尘效率降低； 另一方面， 烟温增加， 会使火花电 压下降， 对除尘不利。 另外， 烟温的高低还直接影响到飞灰比电阻的大小， 烟温的降低， 飞 灰比电阻变小， 提高除尘效率。
对于布袋除尘器而言， 布袋滤料的材质主要是根据烟气温度范围来选取的， 因此， 使用 时必须严格控制烟温， 将烟温降到滤袋长期运转所能承受的温度范围内。 普通换热设备由于 烟气和需要加热工质之间直接热交换而可能产生酸露腐蚀， 因此使用后降低除尘器的进口烟 温同时必然会腐蚀设备。 因此， 缺少一种能降低烟气温度又能防止产生酸露的装置。 发明内容
本发明所要解决的问题是提出一种降低烟气温度提高除尘效率的节能型除尘器， 克服现 有技术中存在的上述问题。
本发明采用以下技术方案予以解决：
本发明一种节能型除尘器， 包括连接在烟道中的除尘设备， 还包括一个烟气余热回收利 用装置， 设在除尘设备前端的烟道中， 该烟气余热回收利用装置包括热交换器， 该热交换器 包括一吸热段和与该吸热段相连的放热段， 吸热段置于除尘设备烟气进口处， 放热段与一冷 凝水管道相连。
本发明所述放热段相连的冷凝水管道上设有电动调节阀， 该电动调节阀与一自动控制装 置相连。
本发明所述吸热段上设有温度传感器， 温度传感器与所述自动控制装置相连。
本发明所述吸热段由装有工质水的翅片管组成。 本发明所述除尘设备包括多个除尘电场。
本发明所述热交换器的吸热段与放热段之间通过蒸汽管道和回水管道相连接， 且放热段 的位置高于吸热段。
通过上述技术方案， 本发明的节能型除尘器通过增加热交换器吸收烟气温度， 并利用装 置壁温的可控可调， 避免设备产生酸露腐蚀， 使除尘设备获得一良好的运行工况， 提高除尘 效率。 对电除尘而言， 烟气温度的降低， 烟气体积减少， 粉尘的比电阻降低， 从而使得除尘 性能得到提高。 若烟温有一定的温降空间， 采用较少电场除尘器能够达到较多电场除尘器的 效率， 节省了投资成本； 对布袋除尘而言， 烟气温度的降低， 直接可以延长布袋的使用寿命， 降低运行成本。 附图说明
图 1 本发明节能型除尘器结构图 具体实施方式
如图 1所示， 本发明一种节能型除尘器， 包括连接在烟道 1中的除尘设备 8和一个烟气 余热回收利用装置 2。烟气余热回收利用装置 2加装在除尘设备 8前这一段烟道中， 该烟气余 热回收利用装置 2包括一热交换器， 该热交换器包括吸热段 7和与该吸热段相连的放热段 3， 吸热段 7置于除尘设备 8烟气进口处， 热交换器的吸热段与放热段之间通过蒸汽管道和回水 管道相连接， 且放热段的位置高于吸热段。 吸热段 7 由多个装有工质水的翅片管组成， 该些 翅片管吸收烟气的热量使水变成水蒸气， 从而使烟气降温。 其中放热段 3 与一冷凝水管道相 连， 该放热段 3通过冷凝水吸热使从吸热段挥发过来的水蒸气变成水循环回去。
本发明还包括一自动控制装置 4， 调节放热段冷凝水流量与吸热段壁面温度。该自动控制 装置 4通过电动调节阀 5与冷凝水管道相连， 进而与热交换器放热段 3相连。 该自动控制装 置 4通过温度传感器 6测量吸热段 7内壁的温度， 并控制冷凝水管道中冷凝水的流量， 通过 调节冷凝水流量的大小来调节温度的大小。
烟气先经过热交换器的吸热段 7， 热交换器吸收烟气余热而使烟气温度降低； 吸收的余热 传给自身的循环水或蒸汽的潜热， 循环水携带的热量或蒸汽的潜热在热量放出段 3与冷凝水进 行热交换后， 再供给需用热的湿式脱硫的烟气再热系统、 加热凝结水系统、 采暖供热系统。 当进入除尘器烟温过高时 （高于酸露点太多）， 自动控制装置 4调节电动调节阀 5， 使得热量放 出段 3传热量增大， 热量放出段传热量增大使得吸热段 7中的传热工质与烟气的温压加大， 余 热吸热段与烟气间传热必然加大， 烟温自然降低。
烟气从锅炉排出， 此时烟气的温度为了不酸露腐蚀锅炉尾部受热面， 通常为 150°C左右， 对于运行时间较长的锅炉来说， 这一温度更高； 然后烟气进入热交换器的吸热段， 通过自动 控制装置设定一高于烟气酸露点的壁温值 T， 此时吸热段的出口烟温， 即除尘设备进口烟温为 T+10°C， 根据锅炉燃料的不同， T值也不同， 一般情况下 T值约为 100°C左右， 通过自动控制 装置控制冷凝水系统自动调节使 T值维持一恒定值， 因此除尘设备的运行工况为 110°C左右， 甚至更低， 较大地提高除尘器的除尘效率。
当烟温降低时， 除尘器除尘效率提高， 在满足国家排放标准的前提下， 可以停运除尘电 场中的一个或几个； 对于新建的项目， 除尘设备设计时考虑烟温降低的程度， 在满足除尘效 率的同时， 可适当减少电场的数目， 节约投资成本。

Claims

权 利 要 求 书
1. 一种节能型除尘器， 包括连接在烟道 （1 ) 中的除尘设备 （8)， 其特征在于， 还包括一个 烟气余热回收利用装置 （2)， 设在除尘设备 （8) 前端的烟道中， 该烟气余热回收利用装 置包括热交换器， 该热交换器包括一吸热段 （7) 和与该吸热段相连的放热段 （3 )， 吸热 段置于除尘设备烟气进口处， 放热段 （3 ) 与一冷凝水管道相连。
2. 根据权利要求 1所述的节能型除尘器， 其特征在于， 所述放热段 （3 ) 相连的冷凝水管道 上设有电动调节阀 （5 )， 该电动调节阀 （5 ) 与一自动控制装置 （4) 相连。
3. 根据权利要求 2所述的节能型除尘器， 其特征在于， 所述吸热段 （7) 上设有温度传感器
(6)， 温度传感器 （6) 与所述自动控制装置 （4) 相连。
4. 根据权利要求 1所述的节能型除尘器， 其特征在于， 所述吸热段 （7) 由装有工质水的翅 片管组成。
5. 根据权利要求 1所述的节能型除尘器， 其特征在于， 所述除尘设备 （8) 包括多个除尘电 场。
6. 根据权利要求 1所述的节能型除尘器， 其特征在于， 所述热交换器的吸热段 （7) 与放热 段 （3 ) 之间通过蒸汽管道和回水管道相连接， 且放热段的位置高于吸热段。
PCT/CN2011/076210 2010-09-21 2011-06-23 节能型除尘器 WO2012037828A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2011800431670A CN103328891A (zh) 2011-06-23 2011-06-23 节能型除尘器
US13/823,948 US9416968B2 (en) 2010-09-21 2011-06-23 Energy-saving electrostatic dust collector
EP11826355.7A EP2620707B1 (en) 2010-09-21 2011-06-23 Energy-saving dust collector

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Application Number Priority Date Filing Date Title
CN201020539491.4 2010-09-21
CN2010205394914U CN201819234U (zh) 2010-09-21 2010-09-21 节能型除尘器

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WO2012037828A1 true WO2012037828A1 (zh) 2012-03-29

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US (1) US9416968B2 (zh)
EP (1) EP2620707B1 (zh)
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WO (1) WO2012037828A1 (zh)

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CN201819234U (zh) 2010-09-21 2011-05-04 上海伏波环保设备有限公司 节能型除尘器
CN103328891A (zh) * 2011-06-23 2013-09-25 上海伏波环保设备有限公司 节能型除尘器
CN104896492B (zh) * 2015-06-10 2017-07-28 国电新能源技术研究院 一种节能低尘排放燃煤火力发电系统
CN107470025A (zh) * 2017-10-09 2017-12-15 东北师范大学 基于物联网的静电处理前烟道降温调水系统
CN113654364A (zh) * 2021-08-24 2021-11-16 河南恒通新材料有限公司 熔炼炉用烟气除尘及余热回收利用装置
CN114887765B (zh) * 2022-06-16 2022-10-04 浙江安达环保设备有限公司 新型高温静电除尘器
CN117180900B (zh) * 2023-11-07 2024-01-30 江苏煌灿新材料科技有限公司 一种适用印染工艺高温烧毛恶臭尾气处理装置

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CN201819234U (zh) 2011-05-04
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