CN205965468U - System for phase transition of wet flue gas desulfurization device is reunited in coordination with desorption fine particles - Google Patents
System for phase transition of wet flue gas desulfurization device is reunited in coordination with desorption fine particles Download PDFInfo
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- 239000010419 fine particle Substances 0.000 title claims abstract description 34
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 23
- 230000023556 desulfurization Effects 0.000 title claims abstract description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title abstract description 44
- 239000003546 flue gas Substances 0.000 title abstract description 44
- 238000003795 desorption Methods 0.000 title 1
- 230000007704 transition Effects 0.000 title 1
- 238000005054 agglomeration Methods 0.000 claims abstract description 43
- 230000002776 aggregation Effects 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000498 cooling water Substances 0.000 claims abstract description 18
- 239000002351 wastewater Substances 0.000 claims abstract description 9
- 239000000779 smoke Substances 0.000 claims abstract description 8
- 238000011010 flushing procedure Methods 0.000 claims abstract description 7
- 239000003595 mist Substances 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims 8
- 230000003134 recirculating effect Effects 0.000 claims 2
- 239000003517 fume Substances 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 29
- 239000002245 particle Substances 0.000 abstract description 12
- 238000009833 condensation Methods 0.000 abstract description 6
- 230000005494 condensation Effects 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 6
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 4
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 238000001089 thermophoresis Methods 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
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- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
一种湿法脱硫装置相变团聚协同脱除细颗粒物的系统，该系统包括依次设置在脱硫主塔出口烟道中的相变团聚装置、相变团聚装置冲洗水喷嘴、除雾器冲洗水喷嘴、除雾器和烟气再热器，相变团聚装置的冷却水来自循环冷却水系统，相变团聚装置的循环水出口通过循环水泵与烟气再热器的入口相连接，烟气再热器的循环水返回循环冷却水系统，除雾器下部布置废水排放槽；本实用新型能够有效促进细颗粒的相变团聚和协同脱除，降低了颗粒物相变团聚的能耗和水耗；另外，水蒸汽的冷却凝结降低了烟气的绝对含湿量，利用相变团聚装置回收的热量加热尾部烟气降低烟气的水蒸汽饱和度，提高烟囱的排烟温度，减轻湿法脱硫后烟囱冒白烟现象。
A wet desulfurization device phase change agglomeration synergistically removes fine particles system, the system includes a phase change agglomeration device sequentially arranged in the outlet flue of the desulfurization main tower, a phase change agglomeration device flushing water nozzle, a mist eliminator flushing water nozzle, Demister and flue gas reheater, the cooling water of the phase change agglomeration device comes from the circulating cooling water system, the circulating water outlet of the phase change agglomeration device is connected with the inlet of the flue gas reheater through the circulating water pump, and the flue gas reheater The circulating water returns to the circulating cooling water system, and the waste water discharge tank is arranged at the lower part of the demister; the utility model can effectively promote the phase change agglomeration and synergistic removal of fine particles, and reduce the energy and water consumption of the phase change agglomeration of particles; in addition, The cooling and condensation of water vapor reduces the absolute moisture content of the flue gas, and the heat recovered by the phase change agglomeration device is used to heat the tail flue gas to reduce the water vapor saturation of the flue gas, increase the exhaust temperature of the chimney, and reduce the chimney leakage after wet desulfurization. White smoke phenomenon.
Description
技术领域technical field
本实用新型涉及烟气污染物减排技术领域，具体涉及一种湿法脱硫装置相变团聚协同脱除细颗粒物的系统。The utility model relates to the technical field of emission reduction of flue gas pollutants, in particular to a system for phase change and agglomeration of a wet desulfurization device to cooperatively remove fine particles.
背景技术Background technique
近来细微颗粒物PM2.5引起的雾霾给人们的生活和身体健康带来了严重不便和危害，已成为国际上大气污染控制技术领域的热点。我国是世界上最大的煤炭消费国，煤燃过程中产生的PM2.5已成为大气中PM2.5的主要来源之一。有数据表明，我国燃煤电厂细颗粒物PM2.5的排放量为135万吨/年左右。日益严重的环境污染问题开始制约我国经济的可持续发展，因此开发高效的燃煤电厂烟气PM2.5的控制技术是燃煤电厂亟待解决的问题。Recently, the smog caused by fine particulate matter PM2.5 has brought serious inconvenience and harm to people's life and health, and has become a hot spot in the field of air pollution control technology in the world. my country is the world's largest coal consumer, and PM2.5 produced during coal combustion has become one of the main sources of PM2.5 in the atmosphere. Statistics show that the emission of fine particulate matter PM2.5 from coal-fired power plants in my country is about 1.35 million tons per year. The increasingly serious environmental pollution problem has begun to restrict the sustainable development of my country's economy. Therefore, it is an urgent problem to be solved in coal-fired power plants to develop efficient PM2.5 control technology in coal-fired power plants.
目前，我国绝大多数燃煤电厂普遍采用的烟气污染物处理方法和设备有选择性催化还原(SCR)脱硝、静电除尘器(ESP)、湿法烟气脱硫(WFGD)系统。烟气首先进入SCR装置进行脱硝处理，除掉绝大部分NOX气体，然后经除尘装置ESP除尘后进入WFGD系统，除掉绝大部分SO2气体，最后经烟囱排入大气环境。其中，除尘装置为主要的颗粒物控制设备。另外，WFGD系统也能脱除部分的颗粒物。At present, the flue gas pollutant treatment methods and equipment commonly used in most coal-fired power plants in my country include selective catalytic reduction (SCR) denitrification, electrostatic precipitator (ESP), and wet flue gas desulfurization (WFGD) systems. The flue gas first enters the SCR device for denitrification treatment to remove most of the NO x gas, and then enters the WFGD system after being dedusted by the dust removal device ESP to remove most of the SO 2 gas, and finally discharged into the atmosphere through the chimney. Among them, the dust removal device is the main particle control equipment. In addition, the WFGD system can also remove part of the particulate matter.
由于细颗粒惯性作用和扩散作用很微弱，传统除尘设备对粒径小于2.5μm的飞灰颗粒捕集效果不佳，尤其是粒径范围处于0.1-0.5μm的颗粒最难被捕集。颗粒团聚技术的核心思想是通过物理或化学的作用将这些亚微米级的颗粒团聚生成较大的颗粒，使得进入除尘设备时颗粒的粒径尽可能的处于有效捕集的范围内。Due to the weak inertia and diffusion of fine particles, traditional dust removal equipment is not effective in capturing fly ash particles with a particle size of less than 2.5 μm, especially particles with a particle size range of 0.1-0.5 μm are the most difficult to capture. The core idea of particle agglomeration technology is to agglomerate these sub-micron particles into larger particles through physical or chemical effects, so that the particle size when entering the dust removal equipment is within the range of effective capture as much as possible.
蒸汽相变团聚技术是有效促进细颗粒团聚长大的技术之一，其机理是：在过饱和水汽环境中，水汽以细颗粒物为凝结核发生相变，使颗粒粒度增大、质量增加，并同时产生扩散泳和热泳的作用，促使细颗粒物迁移运动，相互碰撞接触，进一步促使细颗粒物凝并长大。201010557868.3、201010018238、201210487767.2、201310150551.1等专利利用在脱硫塔加入蒸汽来实现烟气的过饱和，促进颗粒物的团聚，这种方法由于需要在烟气中喷入大量蒸汽，能耗较高，热效率下降。另外，加入蒸汽相变潜热的释放会造成排烟温度升高，导致机组水耗增加。专利201010598462.X公开了一种燃烧烟气中超细颗粒物的冷凝团聚捕集方法及装置，设置增湿降温装置使烟气相对湿度达到90％以上，这种方法同样耗费大量的蒸汽或能量。Steam phase change agglomeration technology is one of the technologies that can effectively promote the agglomeration and growth of fine particles. At the same time, the effects of diffusion swimming and thermophoresis are produced, which promote the migration and movement of fine particles, collide with each other, and further promote the coagulation and growth of fine particles. 201010557868.3, 201010018238, 201210487767.2, 201310150551.1 and other patents use the addition of steam in the desulfurization tower to achieve supersaturation of flue gas and promote the agglomeration of particulate matter. Since this method needs to inject a large amount of steam into the flue gas, the energy consumption is high and the thermal efficiency decreases. In addition, adding the release of steam phase change latent heat will cause the exhaust gas temperature to rise, resulting in an increase in water consumption of the unit. Patent 201010598462.X discloses a method and device for condensing and agglomerating ultrafine particles in combustion flue gas. A humidification and cooling device is installed to make the relative humidity of the flue gas reach more than 90%. This method also consumes a lot of steam or energy.
发明内容Contents of the invention
本实用新型的目的在于克服上述技术的缺点，利用现有的湿法烟气脱硫装置(WFGD)中烟气湿度高的特点，提供了一种湿法脱硫装置相变团聚协同脱除细颗粒物的系统，该系统能够有效促进细颗粒的团聚和协同脱除，降低了颗粒物团聚的能耗和水耗。另外，水蒸汽的冷却凝结降低了烟气的绝对含湿量，利用相变团聚装置回收的热量加热尾部烟气降低烟气的水蒸汽饱和度，提高烟囱的排烟温度，减轻湿法脱硫后烟囱冒白烟现象。The purpose of this utility model is to overcome the shortcomings of the above-mentioned technologies, and utilize the characteristics of high flue gas humidity in the existing wet flue gas desulfurization device (WFGD) to provide a phase change and agglomeration synergistic removal of fine particles in the wet desulfurization device system, which can effectively promote the agglomeration and synergistic removal of fine particles, reducing the energy and water consumption of particle agglomeration. In addition, the cooling and condensation of water vapor reduces the absolute moisture content of the flue gas, and the heat recovered by the phase change agglomeration device is used to heat the tail flue gas to reduce the water vapor saturation of the flue gas, increase the exhaust temperature of the chimney, and reduce the aftermath of wet desulfurization. White smoke from the chimney.
为达到以上目的，本实用新型采用如下技术方案：In order to achieve the above object, the utility model adopts the following technical solutions:
一种湿法脱硫装置相变团聚协同脱除细颗粒物的系统，包括依次设置在脱硫主塔1出口烟道中的相变团聚装置2、相变团聚装置冲洗水喷嘴3、除雾器冲洗水喷嘴4、除雾器5和烟气再热器7，相变团聚装置2的冷却水来自循环冷却水系统，相变团聚装置2的出口通过循环水泵8与烟气再热器7的入口相连接，烟气再热器7的循环水返回循环冷却水系统，除雾器5下部布置废水排放槽6。A system for phase-change agglomeration synergistic removal of fine particles in a wet desulfurization device, comprising a phase-change agglomeration device 2, a phase-change agglomeration device flushing water nozzle 3, and a mist eliminator flushing water nozzle sequentially arranged in the outlet flue of the desulfurization main tower 1 4. The demister 5 and the flue gas reheater 7, the cooling water of the phase change agglomeration device 2 comes from the circulating cooling water system, and the outlet of the phase change agglomeration device 2 is connected to the inlet of the flue gas reheater 7 through a circulating water pump 8 , the circulating water of the flue gas reheater 7 returns to the circulating cooling water system, and the waste water discharge tank 6 is arranged at the lower part of the demister 5 .
所述相变团聚装置2为冷凝式换热器，用于冷却水与含细颗粒物高湿烟气的间接换热。The phase change agglomeration device 2 is a condensing heat exchanger, which is used for indirect heat exchange between cooling water and high-humidity flue gas containing fine particles.
所述废水排放槽6与脱硫补水系统相连接。The waste water discharge tank 6 is connected with the desulfurization replenishment system.
本实用新型利用相变团聚装置中的循环冷却水将脱硫主塔出来的高湿烟气冷却，细颗粒物在温度梯度产生的热泳力的作用下，向冷壁面趋进，增强了细颗粒物间以及细颗粒物与液滴/液膜的碰撞；并且冷却使水蒸气以细颗粒物为凝结核凝结长大，实现细颗粒物的团聚长大，提高后续除雾器对细颗粒物的脱除效率；另外相变团聚装置中循环冷却水回收的热量用于除雾器后烟气的加热，提高烟气的干度。The utility model uses the circulating cooling water in the phase change agglomeration device to cool the high-humidity flue gas from the desulfurization main tower, and the fine particles tend to the cold wall surface under the action of the thermophoretic force generated by the temperature gradient, which strengthens the fine particles and Collision between fine particles and liquid droplets/liquid film; and cooling makes water vapor condense and grow with fine particles as condensation nuclei, realizing the agglomeration and growth of fine particles and improving the removal efficiency of fine particles by subsequent demisters; in addition, phase change The heat recovered by the circulating cooling water in the agglomeration device is used to heat the flue gas behind the demister to improve the dryness of the flue gas.
因此本实用新型具有以下益处和优点：(1)能耗低：通过冷却的方式实现细颗粒物的相变团聚和长大，避免了蒸汽的消耗，系统能耗低；(2)减轻了烟囱冒白烟现象：回收的热量用于烟气的再热，提高烟气干度，避免了因烟气湿度大而产生的冒白烟现象；(3)水的回收利用：通过冷却有效降低了排放烟气中的水分含量，回收的水经处理后可以用于脱硫系统补水，降低系统水耗。Therefore, the utility model has the following benefits and advantages: (1) low energy consumption: the phase change agglomeration and growth of fine particles are realized by cooling, which avoids the consumption of steam, and the system energy consumption is low; White smoke phenomenon: the recovered heat is used for reheating the flue gas, improving the dryness of the flue gas, and avoiding the white smoke phenomenon caused by the high humidity of the flue gas; (3) Water recycling: effectively reducing emissions through cooling The moisture content in the flue gas, the recovered water can be used to replenish water in the desulfurization system after treatment, reducing the water consumption of the system.
附图说明Description of drawings
图1是本实用新型系统的结构示意图。Fig. 1 is a structural schematic diagram of the utility model system.
具体实施方式detailed description
以下结合附图及具体实施过程对本实用新型作进一步的详细描述。Below in conjunction with accompanying drawing and specific implementation process, the utility model is described in further detail.
如图1所示，本实用新型一种湿法脱硫装置相变团聚协同脱除细颗粒物的系统，包括依次设置在脱硫主塔1出口烟道中的相变团聚装置2、相变团聚装置冲洗水喷嘴3、除雾器冲洗水喷嘴4、除雾器5和烟气再热器7，相变团聚装置2的冷却水来自循环冷却水系统，相变团聚装置2的循环水出口通过循环水泵8与烟气再热器7的入口相连接，烟气再热器7的循环水返回循环冷却水系统，除雾器5下部布置废水排放槽6。As shown in Figure 1, the utility model is a wet desulfurization device phase change agglomeration collaborative removal system for fine particles, including a phase change agglomeration device 2 and a phase change agglomeration device flushing water arranged in sequence in the outlet flue of the desulfurization main tower 1 Nozzle 3, demister flushing water nozzle 4, demister 5 and flue gas reheater 7, the cooling water of the phase change agglomeration device 2 comes from the circulating cooling water system, and the circulating water outlet of the phase change agglomeration device 2 passes through the circulating water pump 8 It is connected to the inlet of the flue gas reheater 7, the circulating water of the flue gas reheater 7 returns to the circulating cooling water system, and the waste water discharge tank 6 is arranged at the lower part of the demister 5.
作为本实用新型的优选实施方式，所述相变团聚装置2为冷凝式换热器，用于冷却水与含细颗粒物高湿烟气的间接换热。As a preferred embodiment of the present invention, the phase change agglomeration device 2 is a condensation heat exchanger, which is used for indirect heat exchange between cooling water and high-humidity flue gas containing fine particles.
作为本实用新型的优选实施方式，所述废水排放槽6与脱硫补水系统相连接。As a preferred embodiment of the present utility model, the waste water discharge tank 6 is connected with a desulfurization replenishment system.
本实用新型湿法脱硫装置相变团聚协同脱除细颗粒物的系统协同脱除细颗粒物的方法，依次包括下述步骤：The method for the coordinated removal of fine particles by phase change and agglomeration of the wet desulfurization device of the utility model system synergistically includes the following steps in sequence:
(1)原烟气经脱硫主塔1湿法脱硫后，高湿烟气从脱硫主塔(1)出口经烟道进入相变团聚装置2，相变团聚装置2中的循环冷却水使烟气温度降低10℃～20℃，随着烟气冷却降温，烟气达到过饱和状态，烟气中水蒸汽以细颗粒物为凝结核冷凝长大；(1) After the raw flue gas is wet desulfurized by the desulfurization main tower 1, the high-humidity flue gas enters the phase change agglomeration device 2 from the outlet of the desulfurization main tower (1) through the flue, and the circulating cooling water in the phase change agglomeration device 2 makes the smoke The gas temperature is reduced by 10°C to 20°C. As the flue gas cools down, the flue gas reaches a supersaturated state, and the water vapor in the flue gas condenses and grows with fine particles as condensation nuclei;
(2)随后，在温度梯度产生的热泳力的作用下，细颗粒物向冷壁面趋进，通过细颗粒物与液滴以及细颗粒物间的碰撞凝结，细颗粒物进一步凝结长大，实现细颗粒物的团聚，变成大颗粒；(2) Subsequently, under the action of the thermophoretic force generated by the temperature gradient, the fine particles move towards the cold wall surface, and through the collision and condensation between the fine particles and the liquid droplets and the fine particles, the fine particles further condense and grow up to realize the agglomeration of the fine particles , into large particles;
(3)通过除雾器5对凝结长大的细颗粒物及凝结水有效脱除，含细颗粒物的废水经废水排放槽6排出；(3) The condensed and grown fine particles and condensed water are effectively removed by the demister 5, and the waste water containing fine particles is discharged through the waste water discharge tank 6;
(4)除雾器后的净烟气利用相变团聚装置2回收的热量在烟气再热器7中加热成为干烟气后，最后经净烟气出口9排出。(4) The clean flue gas after the demister is heated in the flue gas reheater 7 by using the heat recovered by the phase change agglomeration device 2 to become dry flue gas, and finally discharged through the clean flue gas outlet 9 .
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106110853A (en) * | 2016-08-29 | 2016-11-16 | 西安热工研究院有限公司 | The system and method for wet desulphurization device phase transformation reunion cooperation-removal fine particle |
| CN107837681A (en) * | 2017-11-24 | 2018-03-27 | 北京万信同和能源科技有限公司 | After catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system and method |
| CN109772074A (en) * | 2017-11-10 | 2019-05-21 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Flue gas water collection, dust removal and mist removal device |
| CN110860177A (en) * | 2019-11-27 | 2020-03-06 | 中国石油化工股份有限公司 | Flue gas purification device and flue gas purification method |
| CN111569630A (en) * | 2020-05-27 | 2020-08-25 | 中国石油化工股份有限公司 | Wet desulfurization system and wet desulfurization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106110853A (en) * | 2016-08-29 | 2016-11-16 | 西安热工研究院有限公司 | The system and method for wet desulphurization device phase transformation reunion cooperation-removal fine particle |
| CN109772074A (en) * | 2017-11-10 | 2019-05-21 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Flue gas water collection, dust removal and mist removal device |
| CN107837681A (en) * | 2017-11-24 | 2018-03-27 | 北京万信同和能源科技有限公司 | After catalytic cracked regenerated exhuast gas desulfurization in gas desulfurizing agent recovery system and method |
| CN110860177A (en) * | 2019-11-27 | 2020-03-06 | 中国石油化工股份有限公司 | Flue gas purification device and flue gas purification method |
| CN110860177B (en) * | 2019-11-27 | 2022-02-22 | 中国石油化工股份有限公司 | Flue gas purification device and flue gas purification method |
| CN111569630A (en) * | 2020-05-27 | 2020-08-25 | 中国石油化工股份有限公司 | Wet desulfurization system and wet desulfurization method |
| CN111569630B (en) * | 2020-05-27 | 2022-03-18 | 中国石油化工股份有限公司 | Wet desulfurization system and wet desulfurization method |
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