CN104226088A - Ultralow-temperature ultra-clean flue gas exhausting system and method for thermal power plant - Google Patents
Ultralow-temperature ultra-clean flue gas exhausting system and method for thermal power plant Download PDFInfo
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Abstract
一种火电厂烟气超低温超净排放系统及方法，来自湿法脱硫出口的烟气由换热洗涤塔的下部进入，由下向上行走，循环冷却水由循环水泵经多层喷嘴雾化后在换热洗涤塔内由上向下行走，烟气与雾化循环冷却水发生强烈的传热传质过程，烟气温度降低过程中，大量水分析出，伴随释放大量热量，同时烟气中的污染物被循环冷却水捕集，循环冷却水吸收烟气中的水分和热量后，由换热洗涤塔的下部排出，进入循环水处理系统，经过沉淀、过滤及加药处理后进入换热系统冷却后循环使用；本发明系统简单，操作方便，能有效缓解湿法脱硫后烟囱冒白烟的现象，实现火电厂烟气的超净排放，同时能回收烟气中的水分和烟气中的低品位热量，具有良好的环保性和经济性。
A thermal power plant flue gas ultra-low temperature and ultra-clean emission system and method, the flue gas from the wet desulfurization outlet enters from the lower part of the heat exchange scrubber, and travels from bottom to top, and the circulating cooling water is atomized by the circulating water pump through the multi-layer nozzles. Walking from top to bottom in the heat exchange scrubber, a strong heat and mass transfer process occurs between the flue gas and the atomized circulating cooling water. During the temperature drop of the flue gas, a large amount of water is analyzed, accompanied by the release of a large amount of heat, and at the same time the Pollutants are captured by the circulating cooling water, which absorbs the moisture and heat in the flue gas, then is discharged from the lower part of the heat exchange washing tower, enters the circulating water treatment system, and enters the heat exchange system after precipitation, filtration and dosing treatment Recycle after cooling; the system of the present invention is simple, easy to operate, can effectively alleviate the phenomenon of white smoke from the chimney after wet desulfurization, realize ultra-clean emission of flue gas from thermal power plants, and can recover the moisture in the flue gas and the Low-grade heat, good environmental protection and economy.
Description
技术领域technical field
本发明涉及火电厂烟气排放技术领域，具体涉及一种火电厂烟气超低温超净排放系统及方法。The invention relates to the technical field of flue gas emission in thermal power plants, in particular to a system and method for ultra-low temperature and ultra-clean emission of flue gas in thermal power plants.
背景技术Background technique
随着国家环保要求的日益严格，火力发电机组的环保指标要求向超净排放的标准发展。目前常规燃煤发电机组对于污染物的控制主要采用SCR/SNCR+FGD+布袋除尘器+低氮燃烧技术，上述污染物控制技术，能实现燃煤发电机组污染物排放满足最新的环保排放要求，但仍然不能达到超净排放的要求，采用烟气超低温超净排放技术，FGD出口的烟气在换热洗涤塔内与雾化喷淋水直接接触，烟气与雾化喷淋水逆流接触的过程中，发生强烈的传热传质过程，烟气中的主要污染物(NOX/SO2/粉尘/Hg等)会被雾化喷淋水捕捉，从而进一步降低烟气中污染物的浓度，实现超净排放。With the increasingly stringent national environmental protection requirements, the environmental protection indicators of thermal power generating units are required to develop towards ultra-clean emission standards. At present, conventional coal-fired power generation units mainly use SCR/SNCR+FGD+bag filter+low-nitrogen combustion technology to control pollutants. The above-mentioned pollutant control technology can realize the pollutant emission of coal-fired power generation units to meet the latest environmental protection emission requirements, but Still can not meet the requirements of ultra-clean emission, using ultra-low temperature ultra-clean emission technology of flue gas, the flue gas at the outlet of FGD is in direct contact with atomized spray water in the heat exchange scrubber, and the process of countercurrent contact between flue gas and atomized spray water In the process, a strong heat and mass transfer process occurs, and the main pollutants in the flue gas (NOX/SO 2 /dust/Hg, etc.) will be captured by the atomized spray water, thereby further reducing the concentration of pollutants in the flue gas and realizing Ultra clean emissions.
石灰石-石膏湿法烟气脱硫技术以其对机组负荷的适应性强、脱硫效率高等优点在火电厂烟气脱硫系统中得到广泛应用。目前，湿法脱硫吸收塔出口烟气的温度一般控制在50℃左右，烟气中的水蒸气处于饱和状态，烟气的含湿量还处于较高的水平。烟气排入大气后，由于大气温度要远低于烟气温度(特别是北方地区的冬天)，烟气中的水蒸气急剧冷却后，以极细颗粒的水滴存在于烟气中，产生大量的水雾，烟囱冒白烟的现象十分严重，同时还会造成石膏雨的二次污染。采用烟气超低温超净排放技术，尽可能的降低排烟温度，从而降低烟气的饱和含水量，回收烟气中的水分，降低湿法脱硫水耗，缓解烟囱冒白烟现象，防止石膏雨的生成。Limestone-gypsum wet flue gas desulfurization technology has been widely used in the flue gas desulfurization system of thermal power plants due to its strong adaptability to unit load and high desulfurization efficiency. At present, the temperature of the flue gas at the outlet of the wet desulfurization absorption tower is generally controlled at about 50°C, the water vapor in the flue gas is in a saturated state, and the moisture content of the flue gas is still at a relatively high level. After the flue gas is discharged into the atmosphere, since the atmospheric temperature is much lower than the flue gas temperature (especially in winter in the northern region), the water vapor in the flue gas cools down sharply, and exists in the flue gas as very fine particles of water droplets, generating a large amount of The phenomenon of white smoke from the chimney is very serious, and it will also cause secondary pollution from gypsum rain. Ultra-low temperature and ultra-clean flue gas emission technology is adopted to reduce the exhaust gas temperature as much as possible, thereby reducing the saturated water content of the flue gas, recovering the moisture in the flue gas, reducing the water consumption of wet desulfurization, alleviating the phenomenon of white smoke from the chimney, and preventing gypsum rain generation.
随着烟气温度的降低，烟气中的饱和水会冷凝，释放出大量的显热和气化潜热，在需要集中供暖的北方地区，可以通过热泵技术大量回收这部分低品位热量作为市政供暖的热源等，具有较高的经济效益。As the temperature of the flue gas decreases, the saturated water in the flue gas will condense, releasing a large amount of sensible heat and latent heat of vaporization. In northern areas where central heating is required, a large amount of this low-grade heat can be recovered by heat pump technology as municipal heating. Heat sources, etc., have high economic benefits.
当这部分热量无法利用时，可以采用冷却塔对循环冷却水进行冷却，保证循环冷却水的回水温度满足设计要求，保证系统的连续稳定运行。When this part of heat cannot be utilized, cooling towers can be used to cool the circulating cooling water to ensure that the return water temperature of the circulating cooling water meets the design requirements and ensure the continuous and stable operation of the system.
总之，采用火电厂烟气超低温超净排放技术可以大幅降低湿法脱硫的水耗、降低烟气中污染物排放，达到超净排放的要求，同时能回收烟气中的显热和气化潜热，提高燃料的利用率，具有良好的环保性和经济性。对燃煤发电机组满足新型环保要求有着十分重要的意义。In short, the use of ultra-low temperature and ultra-clean emission technology for flue gas in thermal power plants can greatly reduce the water consumption of wet desulfurization, reduce the emission of pollutants in the flue gas, meet the requirements of ultra-clean emission, and recover the sensible heat and latent heat of gasification in the flue gas. Improve the utilization rate of fuel, with good environmental protection and economy. It is of great significance for coal-fired generating units to meet new environmental protection requirements.
发明内容Contents of the invention
为了克服上述现有技术存在的问题，本发明的目的在于提供一种火电厂烟气超低温超净排放系统及方法，本发明系统简单，操作方便，能有效缓解湿法脱硫后烟囱冒白烟的现象，降低烟气中的污染物排放，实现火电厂烟气的超净排放，同时能回收烟气中的水分和烟气中的低品位热量，具有良好的环保性和经济性。In order to overcome the above-mentioned problems in the prior art, the object of the present invention is to provide a system and method for ultra-low temperature and ultra-clean discharge of flue gas in a thermal power plant. Phenomenon, reduce the emission of pollutants in the flue gas, realize the ultra-clean emission of flue gas in thermal power plants, and at the same time recover the moisture in the flue gas and the low-grade heat in the flue gas, which has good environmental protection and economy.
为了实现上述目的，本发明采用以下技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种火电厂烟气超低温超净排放系统，包括一换热洗涤塔1，所述换热洗涤塔1的下部设置有烟气入口，与火电厂湿法脱硫塔出口烟道相连接，顶部设置有烟气出口与引风机7的入口相连接；所述换热洗涤塔1内中上部设置有多层喷嘴，喷嘴的入口与循环水泵5的出口相连接，在多层喷嘴的上方布置有多层除雾器，除雾器上设有冲洗水喷嘴，冲洗水喷嘴的入口与冲洗水泵6的出口相连接；所述换热洗涤塔1的底部设置有放水口，放水口与循环冷却水处理系统2的入口相连接；所述换热洗涤塔1的底部还设置有临时排污口；所述循环冷却水处理系统2的出口与换热系统3的循环冷却水进口相连接，所述换热系统3的循环冷却水出口与储水箱4的入口相连接，所述储水箱4的出水口与循环水泵5和冲洗水泵6的入口相连接，储水箱4的下部设有临时排污口。A thermal power plant flue gas ultra-low temperature ultra-clean discharge system, including a heat exchange scrubber 1, the lower part of the heat exchange scrubber 1 is provided with a flue gas inlet, connected with the outlet flue of the thermal power plant wet desulfurization tower, and the top is provided with A flue gas outlet is connected to the inlet of the induced draft fan 7; the middle and upper part of the heat exchange washing tower 1 is provided with multi-layer nozzles, and the inlet of the nozzles is connected to the outlet of the circulating water pump 5, and multiple nozzles are arranged above the multi-layer nozzles. Layer demister, the demister is provided with a flushing water nozzle, the inlet of the flushing water nozzle is connected to the outlet of the flushing water pump 6; the bottom of the heat exchange washing tower 1 is provided with a water outlet, and the water outlet is treated with the circulating cooling water The inlet of the system 2 is connected; the bottom of the heat exchange washing tower 1 is also provided with a temporary sewage outlet; the outlet of the circulating cooling water treatment system 2 is connected with the circulating cooling water inlet of the heat exchange system 3, and the heat exchange The circulating cooling water outlet of the system 3 is connected to the inlet of the water storage tank 4, the water outlet of the water storage tank 4 is connected to the inlets of the circulating water pump 5 and the flushing water pump 6, and the lower part of the water storage tank 4 is provided with a temporary sewage outlet.
所述换热洗涤塔1内布置1-5层循环冷却水的喷嘴。1-5 layers of circulating cooling water nozzles are arranged in the heat exchange washing tower 1 .
所述换热洗涤塔1内布置2-3层除雾器。2-3 layers of mist eliminators are arranged in the heat exchange washing tower 1 .
所述换热系统3为吸收式热泵，所述吸收式热泵的驱动热源来自火电厂汽轮机的低压缸抽气，热网回水作为吸收式热泵高温热源的工质。The heat exchange system 3 is an absorption heat pump. The driving heat source of the absorption heat pump comes from the low-pressure cylinder extraction of the steam turbine in the thermal power plant, and the return water from the heat network is used as the working medium of the high-temperature heat source of the absorption heat pump.
所述换热系统3为冷却塔。The heat exchange system 3 is a cooling tower.
上述所述的火电厂烟气超低温超净排放系统的排放方法，来自火电厂湿法脱硫塔出口的湿烟气由换热洗涤塔1的烟气入口进入，在换热洗涤塔1内由下向上行走，循环冷却水经由多层喷嘴雾化后由上向下行走，烟气与雾化的循环冷却水在换热洗涤塔1内逆流接触，发生强烈的传热传质过程，烟气被循环冷却水冷却，烟气中的水蒸气冷凝后产生大量凝结水进入循环冷却水中，烟气的显热和水蒸气的气化潜热被循环冷却水吸收，降温后的烟气继续上行，通过布置在换热洗涤塔1上部的除雾器，烟气中的大部分液滴被除雾器除去，同时烟气中的部分污染物(SO2/NOx/Hg/粉尘等)进入循环冷却水；降温后的烟气最终由换热洗涤塔1的烟气出口排出，经由引风机7进入烟囱排放至大气；循环冷却水吸热后由换热洗涤塔1底部的放水口放入循环冷却水处理系统2，循环冷却水在其中经过沉淀、过滤及加药中和一系列处理后，由换热系统3的循环冷却水入口进入换热系统3冷却后由换热系统3的循环冷却水出口排入储水箱4，储水箱中的循环冷却水经由循环水泵5和冲洗水泵6送入换热洗涤塔1循环利用。In the discharge method of the ultra-low temperature and ultra-clean exhaust system for flue gas in a thermal power plant described above, the wet flue gas from the outlet of the wet desulfurization tower of the thermal power plant enters through the flue gas inlet of the heat exchange scrubber 1, and in the heat exchange scrubber 1, the Walking upwards, the circulating cooling water is atomized by multi-layer nozzles and then travels from top to bottom, the flue gas and the atomized circulating cooling water are in countercurrent contact in the heat exchange scrubber 1, a strong heat and mass transfer process occurs, and the flue gas is Circulating cooling water cooling, the water vapor in the flue gas is condensed to produce a large amount of condensed water into the circulating cooling water, the sensible heat of the flue gas and the latent heat of vaporization of the water vapor are absorbed by the circulating cooling water, and the cooled flue gas continues to go upward through the arrangement In the demister on the upper part of the heat exchange scrubber 1, most of the liquid droplets in the flue gas are removed by the demister, and at the same time, some pollutants in the flue gas (SO 2 /NOx/Hg/dust, etc.) enter the circulating cooling water; The cooled flue gas is finally discharged from the flue gas outlet of the heat exchange scrubber 1, enters the chimney through the induced draft fan 7, and is discharged to the atmosphere; after the circulating cooling water absorbs heat, it is put into the circulating cooling water from the outlet at the bottom of the heat exchange scrubber 1 for treatment In system 2, the circulating cooling water goes through a series of treatments of sedimentation, filtration and dosing neutralization, then enters the heat exchange system 3 from the inlet of the circulating cooling water of the heat exchange system 3 and is discharged from the outlet of the circulating cooling water of the heat exchange system 3 after being cooled. into the water storage tank 4, and the circulating cooling water in the water storage tank is sent to the heat exchange washing tower 1 for recycling through the circulating water pump 5 and the flushing water pump 6.
所述换热洗涤塔1内的烟气流速控制在0.5～5m/s之间。The flue gas velocity in the heat exchange washing tower 1 is controlled between 0.5-5m/s.
所述换热洗涤塔1内烟气的停留时间控制在3S以上。The residence time of the flue gas in the heat exchange washing tower 1 is controlled above 3S.
所述换热洗涤塔1的排烟温度控制到≤40℃。The exhaust gas temperature of the heat exchange washing tower 1 is controlled to ≤40°C.
控制NOX≤50mg/Nm3,SO2≤35mg/Nm3，粉尘≤10mg/Nm3。Control NO X ≤50mg/Nm 3 , SO 2 ≤35mg/Nm 3 , and dust ≤10mg/Nm 3 .
和现有技术相比较，本发明具有如下优点：Compared with the prior art, the present invention has the following advantages:
1、本发明实现火电厂烟气的超净排放，有效缓解火电机组采用湿法脱硫后烟囱冒白烟的现象，防止石膏雨的产生。回收烟气中的水分，减少湿法脱硫水耗，同时通过余热回收利用技术，提高燃料的利用效率，减少能源浪费。1. The present invention realizes ultra-clean emission of flue gas from thermal power plants, effectively relieves the phenomenon of white smoke from chimneys after wet desulfurization of thermal power units, and prevents the generation of gypsum rain. Recover the moisture in the flue gas, reduce the water consumption of wet desulfurization, and improve the utilization efficiency of fuel and reduce energy waste through waste heat recovery and utilization technology.
2、本发明方法与常规污染物控制技术相结合，可以控制火电厂烟气中NOX≤50mg/Nm3,SO2≤35mg/Nm3，粉尘≤10mg/Nm3。2. Combining the method of the present invention with conventional pollutant control technology, it can control NOx ≤ 50mg/Nm 3 , SO 2 ≤ 35mg/Nm 3 , and dust ≤ 10mg/Nm 3 in the flue gas of thermal power plants.
3、本发明可以控制火电厂烟气排烟温度≤40℃，降低湿法脱硫水耗50％以上。3. The present invention can control the flue gas exhaust temperature of the thermal power plant to ≤40°C, and reduce the water consumption of wet desulfurization by more than 50%.
附图说明Description of drawings
图1为本发明火电厂烟气超低温超净排放方法流程图。Fig. 1 is a flow chart of the ultra-low temperature and ultra-clean emission method for flue gas in a thermal power plant according to the present invention.
图2为本发明实施例1火电厂烟气超低温超净排放方法流程图(带余热回收利用)。Fig. 2 is a flowchart of a method for ultra-low temperature and ultra-clean emission of flue gas from a thermal power plant in Embodiment 1 of the present invention (with waste heat recovery and utilization).
图3为本发明实施例2火电厂烟气超低温超净排放方法流程图(不带余热回收利用)Fig. 3 is a flow chart of the method for ultra-low temperature and ultra-clean emission of flue gas from a thermal power plant in Embodiment 2 of the present invention (without waste heat recovery and utilization)
具体实施方式Detailed ways
下面结合附图和具体实施方式对本发明作更详细的说明。The present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments.
如图1所示，本发明一种火电厂烟气超低温超净排放系统，包括一换热洗涤塔1，所述换热洗涤塔1的下部设置有烟气入口，与火电厂湿法脱硫塔出口烟道相连接，顶部设置有烟气出口与引风机7的入口相连接；所述换热洗涤塔1内中上部设置有多层喷嘴，喷嘴的入口与循环水泵5的出口相连接，在多层喷嘴的上方布置有多层除雾器，除雾器上设有冲洗水喷嘴，冲洗水喷嘴的入口与冲洗水泵6的出口相连接；所述换热洗涤塔1的底部设置有放水口，放水口与循环冷却水处理系统2的入口相连接；所述换热洗涤塔1的底部还设置有临时排污口；所述循环冷却水处理系统2的出口与换热系统3的循环冷却水进口相连接，所述换热系统3的循环冷却水出口与储水箱4的入口相连接，所述储水箱4的出水口与循环水泵5和冲洗水泵6的入口相连接，储水箱4的下部设有临时排污口。As shown in Fig. 1, a kind of ultra-low temperature and ultra-clean discharge system of flue gas of thermal power plant of the present invention comprises a heat exchange washing tower 1, and the bottom of described heat exchange washing tower 1 is provided with flue gas inlet, and the wet desulfurization tower of thermal power plant The outlet flue is connected, and the top is provided with a flue gas outlet connected to the inlet of the induced draft fan 7; the middle and upper part of the heat exchange washing tower 1 is provided with multi-layer nozzles, and the inlet of the nozzles is connected with the outlet of the circulating water pump 5. A multi-layer demister is arranged above the multi-layer nozzle, and the demister is provided with a flushing water nozzle, and the inlet of the flushing water nozzle is connected with the outlet of the flushing water pump 6; the bottom of the heat exchange washing tower 1 is provided with a water outlet , the water outlet is connected to the inlet of the circulating cooling water treatment system 2; the bottom of the heat exchange washing tower 1 is also provided with a temporary sewage outlet; the outlet of the circulating cooling water treatment system 2 is connected to the circulating cooling water of the heat exchange system 3 The inlet is connected, the circulating cooling water outlet of the heat exchange system 3 is connected to the inlet of the water storage tank 4, the water outlet of the water storage tank 4 is connected to the inlet of the circulating water pump 5 and the flushing water pump 6, and the lower part of the water storage tank 4 There is a temporary sewage outlet.
作为本发明的优选实施方式，所述换热洗涤塔1内布置1-5层循环冷却水的喷嘴。As a preferred embodiment of the present invention, 1-5 layers of circulating cooling water nozzles are arranged in the heat exchange washing tower 1 .
作为本发明的优选实施方式，所述换热洗涤塔1内布置2-3层除雾器。As a preferred embodiment of the present invention, 2-3 layers of mist eliminators are arranged in the heat exchange washing tower 1 .
如图1所示，本发明火电厂烟气超低温超净排放系统的排放方法，来自火电厂湿法脱硫塔出口的湿烟气由换热洗涤塔1的烟气入口进入，在换热洗涤塔1内由下向上行走，循环冷却水经由多层喷嘴雾化后由上向下行走，烟气与雾化的循环冷却水在换热洗涤塔1内逆流接触，发生强烈的传热传质过程，烟气被循环冷却水冷却，烟气中的水蒸气冷凝后产生大量凝结水进入循环冷却水中，烟气的显热和水蒸气的气化潜热被循环冷却水吸收，降温后的烟气继续上行，通过布置在换热洗涤塔1上部的除雾器，烟气中的大部分液滴被除雾器除去，同时烟气中的部分污染物(SO2/NOx/Hg/粉尘等)进入循环冷却水；降温后的烟气最终由换热洗涤塔1的烟气出口排出，经由引风机7进入烟囱排放至大气；循环冷却水吸热后由换热洗涤塔1底部的放水口放入循环冷却水处理系统2，循环冷却水在其中经过沉淀、过滤及加药中和一系列处理后，由换热系统3的循环冷却水入口进入换热系统3冷却后由换热系统3的循环冷却水出口排入储水箱4，储水箱中的循环冷却水经由循环水泵5和冲洗水泵6送入换热洗涤塔1循环利用。As shown in Figure 1, in the discharge method of the ultra-low temperature and ultra-clean exhaust system for flue gas in a thermal power plant of the present invention, the wet flue gas from the outlet of the wet desulfurization tower of the thermal power plant enters through the flue gas inlet of the heat exchange scrubber 1, and the exhaust gas in the heat exchange scrubber 1 moves from bottom to top, and the circulating cooling water travels from top to bottom after being atomized by multi-layer nozzles. The flue gas and the atomized circulating cooling water contact countercurrently in the heat exchange washing tower 1, and a strong heat and mass transfer process occurs , the flue gas is cooled by the circulating cooling water, the water vapor in the flue gas is condensed and a large amount of condensed water enters the circulating cooling water, the sensible heat of the flue gas and the latent heat of vaporization of the water vapor are absorbed by the circulating cooling water, and the cooled flue gas continues to Uplink, through the demister arranged on the upper part of the heat exchange scrubber 1, most of the liquid droplets in the flue gas are removed by the demister, and at the same time, some pollutants in the flue gas (SO 2 /NOx/Hg/dust, etc.) enter Circulating cooling water; the flue gas after cooling is finally discharged from the flue gas outlet of the heat exchange washing tower 1, and enters the chimney through the induced draft fan 7 and is discharged to the atmosphere; after absorbing heat, the circulating cooling water is put into Circulating cooling water treatment system 2, in which the circulating cooling water undergoes a series of treatments of sedimentation, filtration and dosing and neutralization, then enters the heat exchange system 3 from the circulating cooling water inlet of the heat exchange system 3 and is cooled by the circulation of the heat exchange system 3 The cooling water outlet is discharged into the water storage tank 4, and the circulating cooling water in the water storage tank is sent to the heat exchange washing tower 1 for recycling through the circulating water pump 5 and the flushing water pump 6.
实施例1：Example 1:
如图2所示，本实施例换热系统3为吸收式热泵，吸收式热泵的驱动热源来自火电厂汽轮机的低压缸抽气，热网回水作为吸收式热泵高温热源的工质。其排放方法为：来自火电厂湿法脱硫塔出口的湿烟气由换热洗涤塔1的烟气入口进入，在换热洗涤塔1内由下向上行走，循环冷却水经由多层喷嘴雾化后由上向下行走，烟气与雾化的循环冷却水在换热洗涤塔1内逆流接触，发生强烈的传热传质过程，烟气被循环冷却水冷却，烟气中的水蒸气冷凝后产生大量凝结水进入循环冷却水中，烟气的显热和水蒸气的气化潜热被循环冷却水吸收，降温后的烟气继续上行，通过布置在换热洗涤塔1上部的除雾器，烟气中的大部分液滴被除雾器除去，同时烟气中的部分污染物(SO2/NOx/Hg/粉尘等)进入循环冷却水；降温后的烟气最终由换热洗涤塔1的烟气出口排出，经由引风机7进入烟囱排放至大气；循环冷却水吸热后由换热洗涤塔1底部的放水口放入循环冷却水处理系统2，循环冷却水经过沉淀、过滤及加药中和等一系列处理后，作为吸收式热泵的低温热源，循环冷却水经过过吸收式热泵吸热降温后，排入储水箱4。吸收式热泵的驱动热源来自火电厂汽轮机的低压缸抽气，热网回水作为高温热源的工质进入吸收式热泵，吸热后由吸收式热泵的高温热源工质出口进入热网。储水箱4中的循环冷却水经由循环水泵5和冲洗水泵6送入换热洗涤塔1循环利用。As shown in Figure 2, the heat exchange system 3 of this embodiment is an absorption heat pump. The driving heat source of the absorption heat pump comes from the low-pressure cylinder extraction of the steam turbine of the thermal power plant, and the return water of the heat network is used as the working medium of the high-temperature heat source of the absorption heat pump. The discharge method is as follows: the wet flue gas from the outlet of the wet desulfurization tower of the thermal power plant enters through the flue gas inlet of the heat exchange scrubber 1, walks from bottom to top in the heat exchange scrubber 1, and the circulating cooling water is atomized through multi-layer nozzles After walking from top to bottom, the flue gas and the atomized circulating cooling water contact countercurrently in the heat exchange scrubber 1, and a strong heat and mass transfer process occurs, the flue gas is cooled by the circulating cooling water, and the water vapor in the flue gas condenses Afterwards, a large amount of condensed water enters the circulating cooling water, the sensible heat of the flue gas and the latent heat of vaporization of the water vapor are absorbed by the circulating cooling water, and the cooled flue gas continues upward, passing through the demister arranged on the upper part of the heat exchange washing tower 1, Most of the liquid droplets in the flue gas are removed by the demister, and at the same time, some pollutants in the flue gas (SO 2 /NOx/Hg/dust, etc.) enter the circulating cooling water; the flue gas after cooling is finally sent to the heat exchange scrubber 1 The flue gas is discharged from the outlet, enters the chimney through the induced draft fan 7, and is discharged to the atmosphere; after the circulating cooling water absorbs heat, it is put into the circulating cooling water treatment system 2 from the water discharge port at the bottom of the heat exchange washing tower 1, and the circulating cooling water is precipitated, filtered and added. After a series of treatment such as medicine neutralization, as the low-temperature heat source of the absorption heat pump, the circulating cooling water is discharged into the water storage tank 4 after being absorbed and cooled by the absorption heat pump. The driving heat source of the absorption heat pump comes from the low-pressure cylinder extraction of the steam turbine in the thermal power plant. The return water of the heat network enters the absorption heat pump as the working medium of the high-temperature heat source. The circulating cooling water in the water storage tank 4 is sent to the heat exchange washing tower 1 for recycling via the circulating water pump 5 and the flushing water pump 6 .
实施例2：Example 2:
如图3所示，本实施例换热系统3为冷却塔。其排放方法为：来自火电厂湿法脱硫塔出口的湿烟气由换热洗涤塔1的烟气入口进入，在换热洗涤塔1内由下向上行走，循环冷却水经由多层喷嘴雾化后由上向下行走，烟气与雾化的循环冷却水在换热洗涤塔1内逆流接触，发生强烈的传热传质过程，烟气被循环冷却水冷却，烟气中的水蒸气冷凝后产生大量凝结水进入循环冷却水中，烟气的显热和水蒸气的气化潜热被循环冷却水吸收，降温后的烟气继续上行，通过布置在换热洗涤塔1上部的除雾器，烟气中的大部分液滴被除雾器除去，同时烟气中的部分污染物(SO2/NOx/Hg/粉尘等)进入循环冷却水；降温后的烟气最终由换热洗涤塔1的烟气出口排出，经由引风机7进入烟囱排放至大气；循环冷却水吸热后由换热洗涤塔1底部的放水口放入循环冷却水处理系统2，循环冷却水经过沉淀、过滤及加药中和等一系列处理后，进入冷却塔，经过冷却塔，冷却后进入储水箱4，储水箱4中的循环冷却水经由循环水泵5和冲洗水泵6送入换热洗涤塔1循环利用。As shown in Figure 3, the heat exchange system 3 of this embodiment is a cooling tower. The discharge method is as follows: the wet flue gas from the outlet of the wet desulfurization tower of the thermal power plant enters through the flue gas inlet of the heat exchange scrubber 1, walks from bottom to top in the heat exchange scrubber 1, and the circulating cooling water is atomized through multi-layer nozzles After walking from top to bottom, the flue gas and the atomized circulating cooling water contact countercurrently in the heat exchange scrubber 1, and a strong heat and mass transfer process occurs, the flue gas is cooled by the circulating cooling water, and the water vapor in the flue gas condenses Afterwards, a large amount of condensed water enters the circulating cooling water, the sensible heat of the flue gas and the latent heat of vaporization of the water vapor are absorbed by the circulating cooling water, and the cooled flue gas continues upward, passing through the demister arranged on the upper part of the heat exchange washing tower 1, Most of the liquid droplets in the flue gas are removed by the demister, and at the same time, some pollutants in the flue gas (SO 2 /NOx/Hg/dust, etc.) enter the circulating cooling water; the flue gas after cooling is finally sent to the heat exchange scrubber 1 The flue gas is discharged from the outlet, enters the chimney through the induced draft fan 7, and is discharged to the atmosphere; after the circulating cooling water absorbs heat, it is put into the circulating cooling water treatment system 2 from the water discharge port at the bottom of the heat exchange washing tower 1, and the circulating cooling water is precipitated, filtered and added. After a series of treatments such as medicine neutralization, it enters the cooling tower, passes through the cooling tower, and enters the water storage tank 4 after cooling. The circulating cooling water in the water storage tank 4 is sent to the heat exchange washing tower 1 for recycling through the circulating water pump 5 and the flushing water pump 6.
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