CN108465372A - A kind of plume of condensation twice disappears white system - Google Patents
A kind of plume of condensation twice disappears white system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
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- 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
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- 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
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- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
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- F23J2215/00—Preventing emissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
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Abstract
本发明涉及一种两次冷凝烟羽消白系统，该系统包括依次串联的选择性催化还原脱硝装置、静电除尘器、石灰石‑石膏湿法脱硫塔、湿式除尘器、引风机和烟囱，在选择性催化还原脱硝装置与静电除尘器之间还设置烟气余热利用装置，在引风机和烟囱之间还设置烟气水冷降温装置。本发明通过采取上述措施降低排烟温度和烟气含湿量，减少烟气中可溶性盐、硫酸雾、有机物等可凝结颗粒物的排放，有效解决了燃煤电厂尾部烟囱烟气直接排放所造成的“白色烟羽”现象，减轻白色烟羽对周边群众造成的视觉污染，消除人们对于火电厂烟气排放的顾忌。
The invention relates to a two-time condensation plume whitening system, which includes a selective catalytic reduction denitrification device, an electrostatic precipitator, a limestone-gypsum wet desulfurization tower, a wet dust collector, an induced draft fan and a chimney connected in series in sequence. A flue gas waste heat utilization device is also installed between the catalytic reduction denitrification device and the electrostatic precipitator, and a flue gas water cooling device is also installed between the induced draft fan and the chimney. The present invention reduces the exhaust gas temperature and the moisture content of the flue gas by taking the above measures, and reduces the emission of condensable particulate matter such as soluble salts, sulfuric acid mist, organic matter, etc. The phenomenon of "white smoke plume" reduces the visual pollution caused by white smoke plume to the surrounding people, and eliminates people's scruples about the flue gas emission of thermal power plants.
Description
技术领域technical field
本发明涉及燃煤电厂尾部烟气处理系统，具体涉及一种两次冷凝烟羽消白系统。The invention relates to a tail flue gas treatment system of a coal-fired power plant, in particular to a twice-condensed smoke plume whitening system.
背景技术Background technique
煤炭是最常用的一次能源。煤燃烧会产生很多污染物，如SO2、NOx、粉尘、重金属等，目前环保标准更为严格，对于大气污染物排放限值：粉尘≤10mg/Nm3，SO2≤35mg/Nm3，NOx≤50mg/Nm3，亟需采取有效措施控制燃煤电厂尾部烟气污染。其中石灰石-石膏湿法脱硫(WFGD)可有效脱除SO2而被广泛应用于各大电厂，但由于其工艺所限，脱硫过程中喷射的大量吸收浆液会导致烟气含湿量急剧增加，最终在烟囱出口，烟气温度达到当地大气压下的饱和温度，形成大量白色烟羽，烟囱出口处大量白色烟羽的存在，形成严重的视觉污染，给周边群众带来心理顾虑，造成恶劣影响。Coal is the most commonly used primary energy source. Coal combustion will produce many pollutants, such as SO 2 , NO x , dust, heavy metals, etc. The current environmental protection standards are more stringent, and the emission limits of air pollutants: dust ≤ 10mg/Nm 3 , SO 2 ≤ 35mg/Nm 3 , NO x ≤50mg/Nm 3 , it is urgent to take effective measures to control tail gas pollution of coal-fired power plants. Among them, limestone-gypsum wet desulfurization (WFGD) can effectively remove SO 2 and is widely used in major power plants. However, due to the limitation of its technology, a large amount of absorption slurry injected during the desulfurization process will lead to a sharp increase in the moisture content of the flue gas. Finally, at the chimney exit, the temperature of the flue gas reaches the saturation temperature under the local atmospheric pressure, forming a large amount of white smoke plume. The existence of a large number of white smoke plumes at the chimney exit forms serious visual pollution, brings psychological concerns to the surrounding people, and causes adverse effects.
中国专利CN206504349U公开了一种冷凝减排收水加热烘干消除烟羽的系统，至少包括湿法脱硫吸收塔、除雾器、烟气冷凝换热装置、烟气加热换热装置，脱硫塔出口的烟气先经过烟气冷凝换热装置冷凝析出水分，后经过烟气加热装置烘干，最后排入大气，该装置先经过冷凝换热装置冷却析出水分，后经过烟气加热换热装置烘干，最后使烟气排入大气，但该方案企图通过提高排烟温度，使烟气中的水汽在更高的位置凝结，但这仅仅减轻了烟囱出口的白色烟羽现象，是治标不治本的，没有从本质上终结烟气含盐含湿对环境造成的影响。Chinese patent CN206504349U discloses a system for condensing and reducing emissions, collecting water, heating, drying and eliminating smoke plumes, at least including a wet desulfurization absorption tower, a demister, a flue gas condensation heat exchange device, a flue gas heating heat exchange device, and a desulfurization tower outlet The flue gas first passes through the flue gas condensation heat exchange device to condense and precipitate moisture, then passes through the flue gas heating device to dry, and finally discharges into the atmosphere. Finally, the flue gas is discharged into the atmosphere, but this plan attempts to increase the temperature of the exhaust gas to condense the water vapor in the flue gas at a higher position, but this only reduces the white plume phenomenon at the chimney outlet, which is a temporary solution, not a permanent cure Yes, it does not essentially end the impact of the salt and humidity in the flue gas on the environment.
发明内容Contents of the invention
本发明的目的就是为了解决上述问题而提供一种两次冷凝烟羽消白系统，解决目前电厂尾部烟气处理工艺中的严重白色烟羽现象，其能够有效去除白色烟羽，同时减轻烟气含盐而对环境造成的影响，消除视觉污染，打消周边群众对燃煤电厂烟气排放的顾虑。The purpose of the present invention is to solve the above problems and provide a two-time condensation plume whitening system to solve the serious white plume phenomenon in the current flue gas treatment process at the tail of the power plant, which can effectively remove the white plume and reduce flue gas at the same time. The impact on the environment caused by salt content can eliminate visual pollution and dispel the concerns of surrounding people about flue gas emissions from coal-fired power plants.
本发明的目的通过以下技术方案实现：The object of the present invention is achieved through the following technical solutions:
一种两次冷凝烟羽消白系统，该系统包括依次串联的选择性催化还原脱硝装置、静电除尘器、石灰石-石膏湿法脱硫塔、湿式除尘器、引风机和烟囱，在所述选择性催化还原脱硝装置与静电除尘器之间还设置烟气余热利用装置，在所述引风机和烟囱之间还设置烟气水冷降温装置。A two-time condensing plume whitening system, the system includes a selective catalytic reduction denitrification device, an electrostatic precipitator, a limestone-gypsum wet desulfurization tower, a wet dust collector, an induced draft fan and a chimney connected in series. A flue gas waste heat utilization device is also installed between the catalytic reduction denitrification device and the electrostatic precipitator, and a flue gas water cooling device is also installed between the induced draft fan and the chimney.
进一步地，所述烟气余热利用装置包括烟气-工质间壁式换热器，所述烟气-工质间壁式换热器的烟气进口连接选择性催化还原脱硝装置，其烟气出口连接静电除尘器，所述烟气-工质间壁式换热器内设有换热管，该换热管连接至电厂锅炉热力循环系统。Further, the flue gas waste heat utilization device includes a flue gas-working medium partition wall heat exchanger, the flue gas inlet of the flue gas-working medium partition wall heat exchanger is connected to a selective catalytic reduction denitrification device, and its flue gas outlet is Connected to the electrostatic precipitator, the flue gas-working medium partition wall heat exchanger is provided with a heat exchange tube, and the heat exchange tube is connected to the thermal cycle system of the power plant boiler.
进一步地，所述电厂锅炉热力循环系统包括依次串联连接的水冷式凝汽器、凝结水泵、低压加热器、除氧器、给水泵、高压加热器、超临界直流锅炉以及凝汽式汽轮机，所述换热器设置在凝结水泵与低压加热器之间。Further, the thermal cycle system of the power plant boiler includes a water-cooled condenser, a condensate pump, a low-pressure heater, a deaerator, a feed water pump, a high-pressure heater, a supercritical once-through boiler, and a condensing steam turbine connected in series in sequence. The heat exchanger is arranged between the condensate pump and the low-pressure heater.
进一步地，所述水冷式凝汽器连接循环冷却水，可取自长江，水温在20℃左右。Further, the water-cooled condenser is connected with circulating cooling water, which can be taken from the Yangtze River, and the water temperature is about 20°C.
进一步地，所述除氧器连接补给水设备。Further, the deaerator is connected to make-up water equipment.
进一步地，所述烟气水冷降温装置包括烟气-冷却水间壁式换热器，所述烟气-冷却水间壁式换热器的烟气进口连接引风机，其烟气出口连接烟囱，所述烟气-冷却水间壁式换热器内设有换热管，该换热管连接至抽取低温冷却水的循环水泵。Further, the flue gas water cooling device includes a flue gas-cooling water partition wall heat exchanger, the flue gas inlet of the flue gas-cooling water partition wall heat exchanger is connected to an induced draft fan, and its flue gas outlet is connected to a chimney, so A heat exchange tube is arranged in the flue gas-cooling water partition wall heat exchanger, and the heat exchange tube is connected to a circulating water pump for extracting low-temperature cooling water.
进一步地，所述烟气-冷却水间壁式换热器出口的烟气温度低于50℃。Further, the flue gas temperature at the outlet of the flue gas-cooling water dividing wall heat exchanger is lower than 50°C.
进一步地，所述换热管为蛇形螺旋翅片管。Further, the heat exchange tubes are serpentine spiral finned tubes.
进一步地，换热器采用逆流布置。Further, the heat exchanger adopts a counter-flow arrangement.
本发明提供的一种两次冷凝烟羽消白系统，烟气经过烟气余热利用装置与烟气水冷降温装置，经过两次冷凝后，其温度降低到50℃左右，由于在电除尘器入口设置有烟气余热利用装置，进行换热降温，回收烟气余热，降低烟气中水蒸汽含盐量；在引风机与所述烟囱之间设置有烟气水冷降温装置，使部分水蒸汽凝结成水，水对盐具有更高的溶解度，从而降低水蒸汽中含盐量，同时降温会减少排出烟囱的水蒸汽含量。此时，烟囱进口烟气温度仅为50℃，经过两次降温，烟气中水汽含量已急剧降低，即便残留部分水汽，因烟囱内壁设置有抗腐蚀钛合金材料的保护，也不会对烟囱主体造成威胁，从而从源头上杜绝了烟气含烟含湿对环境的危害，以此形成的两次冷凝系统，有效降低白色烟羽造成的视觉污染以及烟气中含盐本身对环境的影响，打消电厂周边群众对烟气排放的顾虑。具体有以下优点：The present invention provides a two-time condensed smoke plume whitening system. The flue gas passes through the flue gas waste heat utilization device and the flue gas water cooling device. After two condensations, the temperature drops to about 50°C. A flue gas waste heat utilization device is installed to perform heat exchange and cooling, recover flue gas waste heat, and reduce the salt content of water vapor in the flue gas; a flue gas water cooling device is installed between the induced draft fan and the chimney to condense part of the water vapor Water has a higher solubility for salt, thereby reducing the salt content in water vapor, and cooling will reduce the water vapor content discharged from the chimney. At this time, the temperature of the flue gas at the chimney inlet is only 50°C. After two times of cooling, the water vapor content in the flue gas has dropped sharply. The main body poses a threat, thereby eliminating the harm to the environment caused by the smoke and humidity in the flue gas from the source. The two condensation systems formed in this way can effectively reduce the visual pollution caused by the white smoke plume and the impact of the salt in the flue gas on the environment. , to dispel the concerns of the people around the power plant about flue gas emissions. Specifically, it has the following advantages:
1、烟气余热利用装置回收烟气余热用以加热凝结水，节约资源，降低发电煤耗。1. The flue gas waste heat utilization device recovers the waste heat of flue gas to heat condensed water, save resources and reduce coal consumption for power generation.
2、烟气水冷降温装置通过循环冷却水使烟气冷凝，其中循环冷却水取自长江，长江水温20℃左右，循环冷却水与烟气之间换热温差较大，从而换热效果好，循环冷却水取材方便，成本低廉，便于后期补给。2. The flue gas water cooling device condenses the flue gas through circulating cooling water. The circulating cooling water is taken from the Yangtze River. The temperature of the Yangtze River is about 20°C. The heat exchange temperature difference between the circulating cooling water and the flue gas is large, so the heat exchange effect is good. Circulating cooling water is convenient to obtain materials, low in cost, and convenient for later replenishment.
3、经过两次冷凝后的烟气，其含盐量大幅降低，可减轻烟气含盐对环境的影响。3. The salt content of the flue gas after two condensations is greatly reduced, which can reduce the impact of the salt content of the flue gas on the environment.
4、烟囱出口不会出现由于烟气内水蒸气凝结而产生的白色烟羽现象，减轻视觉污染，打消人民群众对燃煤电厂烟气排放的顾虑。4. There will be no white plume phenomenon at the chimney outlet due to the condensation of water vapor in the flue gas, reducing visual pollution and dispelling the people's concerns about flue gas emissions from coal-fired power plants.
5、本发明系统布局简单合理，初投资小，后期维修成本低。5. The system layout of the present invention is simple and reasonable, the initial investment is small, and the later maintenance cost is low.
附图说明Description of drawings
图1为本发明系统的结构示意图；Fig. 1 is the structural representation of the system of the present invention;
图2为烟气余热利用装置示意图；Figure 2 is a schematic diagram of a flue gas waste heat utilization device;
图3为烟气水冷降温装置示意图；Fig. 3 is a schematic diagram of the flue gas water cooling device;
图中：选择性催化还原脱硝装置1、烟气余热利用装置2、静电除尘器3、石灰石-石膏湿法脱硫塔4、湿式除尘器5、引风机6、烟气水冷降温装置7、烟囱8。In the figure: selective catalytic reduction denitration device 1, flue gas waste heat utilization device 2, electrostatic precipitator 3, limestone-gypsum wet desulfurization tower 4, wet dust collector 5, induced draft fan 6, flue gas water cooling device 7, chimney 8 .
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
实施例Example
请参阅图1，一种两次冷凝烟羽消白系统，该系统包括依次串联的选择性催化还原脱硝装置(SCR)1、静电除尘器(ESP)3、石灰石-石膏湿法脱硫塔(WFGD)4、湿式除尘器5、引风机6和烟囱8，在选择性催化还原脱硝装置1与静电除尘器3之间还设置烟气余热利用装置2，在引风机6和烟囱8之间还设置烟气水冷降温装置7。Please refer to Figure 1, a two-time condensation plume elimination system, which includes a selective catalytic reduction denitrification device (SCR) 1, an electrostatic precipitator (ESP) 3, a limestone-gypsum wet desulfurization tower (WFGD) connected in series ) 4. Wet dust collector 5, induced draft fan 6 and chimney 8, flue gas waste heat utilization device 2 is also set between selective catalytic reduction denitrification device 1 and electrostatic precipitator 3, and flue gas waste heat utilization device 2 is also set between induced draft fan 6 and chimney 8 Flue gas water cooling device 7.
燃煤电厂尾部烟气的工艺流程是，烟气流经选择性催化还原脱硝装置进行脱硝工艺，再到电除尘器进行除尘工艺，在电除尘器入口处烟气的温度为220℃左右，在电除尘器入口增加烟气余热利用装置回收烟气余热用以加热凝结水，同时降低烟气中水蒸汽含盐量，此为第一次冷凝；烟气通过静电除尘器，再到石灰石-石膏湿法脱硫塔进行脱硫工艺，石灰石-石膏湿法脱硫工艺采用石灰石或石灰作为脱硫吸附剂，石灰石经研磨成细粉状与水搅拌混合形成吸收浆液(当采用石灰为吸收剂时，石灰粉经消化处理后与水拌合形成吸收浆液)，在石灰石-石膏湿法脱硫塔内，吸收浆液与烟气充分接触混合以达到脱硫的目的，此工艺过程导致烟气含湿量急剧增大，从而容易在烟囱出口形成白色烟羽。烟气流经石灰石-石膏湿法脱硫塔，再到湿式除尘器，随着环保标准的日益严苛，电厂加装湿式除尘器旨在进一步净化烟气以达到环保要求，湿式除尘器是使含尘气体与水密切接触，利用水滴和颗粒的惯性碰撞或者利用水和粉尘的充分混合作用及其他作用捕集颗粒或使颗粒增大或留于固定容器内达到水和粉尘分离效果的装置，此工艺过程使得烟气含湿量继续增大，从而容易在烟囱出口形成白色烟羽。烟气流经湿式除尘器，再到引风机，此时烟气温度为110℃左右，为消除燃煤电厂烟囱出口白色烟羽现象，烟囱经过烟气水冷降温装置后，使烟气温度降低到50℃左右，再到烟囱排放，此为第二次冷凝。The process flow of flue gas at the tail of a coal-fired power plant is that the flue gas flows through the selective catalytic reduction denitrification device for denitrification process, and then goes to the electrostatic precipitator for dust removal process. At the entrance of the electrostatic precipitator, a flue gas waste heat utilization device is added to recover the waste heat of the flue gas to heat the condensed water, and at the same time reduce the salt content of the water vapor in the flue gas. This is the first condensation; the flue gas passes through the electrostatic precipitator, and then to the limestone-gypsum The wet desulfurization tower performs the desulfurization process. The limestone-gypsum wet desulfurization process uses limestone or lime as the desulfurization adsorbent. After digestion and mixing with water to form absorption slurry), in the limestone-gypsum wet desulfurization tower, the absorption slurry is fully contacted and mixed with the flue gas to achieve the purpose of desulfurization. This process leads to a sharp increase in the moisture content of the flue gas, thus It is easy to form a white plume at the chimney outlet. The flue gas flows through the limestone-gypsum wet desulfurization tower, and then to the wet dust collector. With the increasingly stringent environmental protection standards, the power plant installs a wet dust collector to further purify the flue gas to meet environmental protection requirements. The wet dust collector is to make the containing Dust gas is in close contact with water, using the inertial collision of water droplets and particles or using the full mixing of water and dust and other effects to capture particles or make the particles increase or stay in a fixed container to achieve the separation effect of water and dust. The technological process makes the moisture content of the flue gas continue to increase, which makes it easy to form a white plume at the chimney outlet. The flue gas flows through the wet dust collector and then to the induced draft fan. At this time, the flue gas temperature is about 110°C. In order to eliminate the white plume phenomenon at the chimney outlet of the coal-fired power plant, the flue gas temperature is reduced to About 50 ℃, and then to the chimney discharge, this is the second condensation.
请参阅图2，烟气余热利用装置包括烟气-工质间壁式换热器，水冷式凝汽器通过凝结水泵连接低压加热器，低压加热器连接除氧器，除氧器通过给水泵连接高压加热器，高压加热器连接超临界直流锅炉，超临界直流锅炉连接凝汽式汽轮机，凝汽式汽轮机连接水冷式凝汽器构成电厂锅炉系统热力循环。烟气-工质间壁式换热器包括烟气进口，烟气出口，换热管进口，换热管出口，换热管。烟气进口连接选择性催化还原脱硝装置，烟气出口连接静电除尘器；换热器进口连接水冷式凝汽器，换热器出口连接低压加热器。Please refer to Figure 2, the flue gas waste heat utilization device includes a flue gas-working medium partition wall heat exchanger, the water-cooled condenser is connected to the low-pressure heater through the condensate pump, the low-pressure heater is connected to the deaerator, and the deaerator is connected to the feed water pump The high-pressure heater is connected to the supercritical once-through boiler, the supercritical once-through boiler is connected to the condensing steam turbine, and the condensing steam turbine is connected to the water-cooled condenser to form a thermal cycle of the boiler system of the power plant. The flue gas-working medium partition wall heat exchanger includes a flue gas inlet, a flue gas outlet, a heat exchange tube inlet, a heat exchange tube outlet, and a heat exchange tube. The flue gas inlet is connected to a selective catalytic reduction denitrification device, the flue gas outlet is connected to an electrostatic precipitator; the heat exchanger inlet is connected to a water-cooled condenser, and the heat exchanger outlet is connected to a low-pressure heater.
烟气余热利用装置的烟气流程为：经过选择性催化还原脱硝装置后烟气的温度为220℃左右，烟气经过选择性催化还原脱硝装置出口烟道进入烟气-工质间壁式换热器，在烟气-工质间壁式换热器内烟气与工质进行间壁式换热，使烟气温度降低到150℃左右，之后烟气经过静电除尘器入口烟道进入静电除尘器。The flue gas process of the flue gas waste heat utilization device is as follows: the temperature of the flue gas after passing through the selective catalytic reduction denitrification device is about 220 °C, and the flue gas enters the flue gas-working fluid partition wall heat exchange through the outlet flue of the selective catalytic reduction denitrification device In the flue gas-working medium partition wall heat exchanger, the flue gas and the working fluid perform partition heat exchange to reduce the temperature of the flue gas to about 150°C, and then the flue gas enters the electrostatic precipitator through the inlet flue of the electrostatic precipitator.
烟气余热利用装置的工质流程为：从水冷式凝汽器抽取的部分工质，经过水冷式凝汽器到换热器管路进入换热管吸收烟气余热，升温后的工质再经过换热器到低压加热器管路回到低压加热器。The working fluid process of the flue gas waste heat utilization device is as follows: part of the working fluid extracted from the water-cooled condenser passes through the water-cooled condenser to the heat exchanger pipeline and enters the heat exchange tube to absorb the waste heat of the flue gas. Return to the low pressure heater through the heat exchanger to the low pressure heater line.
请参阅图3，烟气水冷降温装置包括烟气-冷却水间壁式换热器，循环水泵从长江抽取冷却水，循环水泵连接凝汽器构成冷却水循环，烟气-冷却水间壁式换热器连接循环水泵。烟气-冷却水间壁式换热器包括烟气进口，烟气出口，换热管进口，换热管出口，换热管。烟气进口连接引风机，烟气出口连接烟囱；换热器进口连接循环水泵，换热器出口连接循环水泵。Please refer to Figure 3. The flue gas water cooling device includes a flue gas-cooling water wall heat exchanger. The circulating water pump draws cooling water from the Yangtze River. The circulating water pump is connected to the condenser to form a cooling water cycle. The flue gas-cooling water wall heat exchanger Connect the circulating water pump. The flue gas-cooling water partition wall heat exchanger includes a flue gas inlet, a flue gas outlet, a heat exchange tube inlet, a heat exchange tube outlet, and a heat exchange tube. The flue gas inlet is connected to the induced draft fan, and the flue gas outlet is connected to the chimney; the heat exchanger inlet is connected to the circulating water pump, and the heat exchanger outlet is connected to the circulating water pump.
烟气水冷降温装置的烟气流程为：烟气经过烟气进口烟道进入烟气-冷却水间壁式换热器，在烟气-冷却水间壁式换热器内烟气与冷却水进行间壁式换热，使烟气温度降低到50℃左右，之后烟气经过烟气出口烟道进入烟囱。The flue gas flow of the flue gas water cooling device is as follows: the flue gas enters the flue gas-cooling water partition wall heat exchanger through the flue gas inlet flue, and the flue gas and the cooling water partition wall heat exchanger in the flue gas-cooling water partition wall heat exchanger Type heat exchange, so that the flue gas temperature is reduced to about 50 ℃, and then the flue gas enters the chimney through the flue gas outlet flue.
烟气水冷降温装置的冷却水流程为：循环水泵从长江抽取低温的冷却水，冷却水经过换热管进口管路进入换热管与烟气换热，之后冷却水经过换热管出口管路回到循环水泵，并最终排入长江。The cooling water process of the flue gas water cooling device is as follows: the circulating water pump draws low-temperature cooling water from the Yangtze River, the cooling water enters the heat exchange tube through the inlet pipe of the heat exchange tube to exchange heat with the flue gas, and then the cooling water passes through the outlet pipe of the heat exchange tube Back to the circulating water pump, and finally discharged into the Yangtze River.
换热管均为蛇形螺旋翅片管，可有效提高换热效率。The heat exchange tubes are serpentine spiral finned tubes, which can effectively improve the heat exchange efficiency.
换热器均为逆流布置，平均温差大，换热效果好。The heat exchangers are all arranged in countercurrent, the average temperature difference is large, and the heat exchange effect is good.
上述仅为本发明的较佳实施例而已，并不用以限定本发明，凡在本发明精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明保护范围之内。The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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