CN110307558A - A flue gas whitening structure of ammonia desulfurization tower and its operation method - Google Patents
A flue gas whitening structure of ammonia desulfurization tower and its operation method Download PDFInfo
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- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- F23J15/006—Layout of treatment plant
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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
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- F23J15/00—Arrangements of devices for treating smoke or fumes
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- B01D2251/00—Reactants
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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
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/15081—Reheating of flue gases
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Abstract
本发明提供一种氨法脱硫塔烟气消白结构及其运行方法，投资更低、运行更稳定、方法更简单、消白效率高，且可用于已有的氨法脱硫塔装置，在不改变原有氨法脱硫塔结构的基础上进行消白改造。循环水溶液管道与水洗循环槽和与过滤器连接，过滤器与空气换热器连接，空气换热器与板式换热器连接，板式换热器与水洗循环槽连接；水洗循环槽与水洗循环泵和除雾器冲洗水泵连接；冷却水泵与自吸罐和冷却水管道连接，冷却水管道与板式换热器连接；离心风机与空气换热器连接，空气换热器与蒸气加热器连接，蒸汽加热器与热风管道连接。
The present invention provides an ammonia-based desulfurization tower flue gas whitening structure and its operation method, which have lower investment, more stable operation, simpler method and high whitening efficiency, and can be used in existing ammonia-based desulfurization tower devices. On the basis of changing the structure of the original ammonia desulfurization tower, the whitening transformation is carried out. The circulating water solution pipeline is connected to the water washing circulation tank and the filter, the filter is connected to the air heat exchanger, the air heat exchanger is connected to the plate heat exchanger, the plate heat exchanger is connected to the water washing circulation tank; the water washing circulation tank is connected to the water washing circulation pump It is connected with the flushing water pump of the demister; the cooling water pump is connected with the self-priming tank and the cooling water pipeline, and the cooling water pipeline is connected with the plate heat exchanger; the centrifugal fan is connected with the air heat exchanger, and the air heat exchanger is connected with the steam heater, and the steam The heater is connected with the hot air duct.
Description
技术领域technical field
本发明涉及一种氨法脱硫塔烟气消白结构及其运行方法，用于烟气脱硫领域。The invention relates to an ammonia method desulfurization tower flue gas whitening structure and an operation method thereof, which are used in the field of flue gas desulfurization.
背景技术Background technique
由于氨法脱硫反应速率快，吸收剂利用率高，能保持脱硫效率95-99%，且无二次污染，兼具环保性和经济效益的优点，该烟气脱硫工艺越来越受重视。在氨法烟气脱硫系统吸收塔出口，排出的净烟气由于处于湿饱和状态，由烟囱排入大气的烟气在与大气混合扩散过程中温度降低，烟气中的水析出，在烟囱周边形成白雾，俗称“烟羽”，促进雾霾的形成，对市民生活及视觉造成困扰。随着国家环保治理要求越来越严格，多地陆续出台了烟羽消白的要求。针对目前已有的氨法脱硫塔装置，在不改变原有氨法脱硫塔结构的基础上，开发一种氨法脱硫塔烟气消白结构及方法具有较高的工程实践价值。Due to the fast reaction rate of ammonia desulfurization, high utilization rate of absorbent, 95-99% desulfurization efficiency, no secondary pollution, environmental protection and economic benefits, this flue gas desulfurization process has attracted more and more attention. At the outlet of the absorption tower of the ammonia-based flue gas desulfurization system, the discharged net flue gas is in a wet-saturated state. The temperature of the flue gas discharged into the atmosphere from the chimney decreases during the process of mixing and diffusing with the atmosphere, and the water in the flue gas precipitates out. The formation of white mist, commonly known as "smoke plume", promotes the formation of smog, causing troubles to citizens' life and vision. As the national environmental protection management requirements become more and more stringent, many places have successively issued requirements for the reduction of smoke plume. Aiming at the existing ammonia desulfurization tower device, on the basis of not changing the structure of the original ammonia desulfurization tower, it is of high engineering practice value to develop a structure and method for flue gas elimination of ammonia desulfurization tower.
现有的氨法脱硫烟气消白技术，如申请号为201810992331.6的中国专利所示，此方法是在水洗段集液器的出口与循环水箱之间设置换热器和蒸汽驱动型吸收式热泵机组，来实现烟气脱硫消白的目的。该方法存在较大的弊端，其中蒸汽驱动型吸收式热泵机组在实际运行时，其边界参数，如热源进口水温度及流量、驱动蒸汽压力和过热度等，由于受各种内在、外在因素影响而使吸收式热泵机组的运行工况远远偏离设计工况，达不到原先的冷却效果，从而影响烟气消白的效率；另外如仅仅通过设置换热器进行预冷却，循坏水溶液中的杂质可能会堵塞、腐蚀换热器，影响冷却效率及消白系统的机组稳定性。The existing ammonia desulfurization flue gas whitening technology, as shown in the Chinese patent application number 201810992331.6, this method is to install a heat exchanger and a steam-driven absorption heat pump between the outlet of the liquid collector in the washing section and the circulating water tank unit to achieve the purpose of flue gas desulfurization and whitening. This method has great disadvantages. During the actual operation of the steam-driven absorption heat pump unit, its boundary parameters, such as the temperature and flow rate of the inlet water of the heat source, the driving steam pressure and the degree of superheat, etc., are affected by various internal and external factors. The operating condition of the absorption heat pump unit deviates far from the design condition, and the original cooling effect cannot be achieved, thus affecting the efficiency of flue gas whitening; Impurities may block and corrode the heat exchanger, affecting the cooling efficiency and unit stability of the whitening system.
发明内容Contents of the invention
本发明的目的在于克服现有技术中存在的上述不足，而提供一种结构设计合理的氨法脱硫塔烟气消白结构及其运行方法，投资更低、运行更稳定、方法更简单、消白效率高，且可利用已有的氨法脱硫塔装置，在不改变原有氨法脱硫塔结构的基础上进行消白改造。The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a flue gas whitening structure and operating method of an ammonia desulfurization tower with a reasonable structural design, which has lower investment, more stable operation, simpler method, and The whitening efficiency is high, and the existing ammonia desulfurization tower device can be used to carry out whitening transformation without changing the structure of the original ammonia desulfurization tower.
本发明解决上述问题所采用的技术方案是：一种氨法脱硫塔烟气消白结构，包括脱硫塔、电厂余热蒸汽管道、电厂蒸汽管道和电厂冷却水塔蓄水池，脱硫塔设置有水洗段集液器、循环水冲洗分布器、除雾器和塔出口烟囱；The technical scheme adopted by the present invention to solve the above-mentioned problems is: an ammonia desulfurization tower flue gas whitening structure, including a desulfurization tower, a power plant waste heat steam pipeline, a power plant steam pipeline and a power plant cooling water tower reservoir, and the desulfurization tower is provided with a water washing section Liquid collector, circulating water flushing distributor, mist eliminator and tower outlet chimney;
其特征在于：还包括过滤器、空气换热器、板式换热器、循环水溶液旁路管道、水洗循环槽、除雾器冲洗水泵、水洗循环泵、蒸气加热器、离心风机、自吸罐、冷却水泵、冷却水管道、热风管道和循环水溶液管道；水洗段集液器的循环水出口与循环水溶液管道的进口连接；循环水溶液管道的出口分为两路，一路通过循环水溶液旁路管道与水洗循环槽的进口连接，另一路与过滤器的进口连接，过滤器的出口与空气换热器的循环水溶液进口连接，空气换热器的循环水溶液出口与板式换热器的循环水溶液进口连接，板式换热器的循环水溶液出口与水洗循环槽的进口连接；水洗循环槽的出口分为两路，一路与水洗循环泵的进口连接，另一路与除雾器冲洗水泵的进口连接，水洗循环泵的出口与循环水冲洗分布器的进料口连接，除雾器冲洗水泵的出口与除雾器的冲洗口连接；电厂冷却水塔蓄水池与自吸罐连接；冷却水泵的进口与自吸罐连接，出口与冷却水管道的进口连接，冷却水管道的出口与板式换热器的冷却水进口连接，板式换热器的冷却水出口与电厂冷却水塔蓄水池连接；离心风机的出口与空气换热器的进气接口连接，空气换热器的出气接口与蒸气加热器的进气接口连接，蒸汽加热器的出气接口与热风管道连接，热风管道与脱硫塔的塔出口烟囱连接；电厂余热蒸汽管道与蒸汽加热器的蒸汽进口连接，蒸汽加热器的蒸汽出口与电厂蒸汽管道连接。It is characterized in that it also includes filters, air heat exchangers, plate heat exchangers, circulating aqueous solution bypass pipes, water washing circulation tanks, demister flushing water pumps, water washing circulation pumps, steam heaters, centrifugal fans, self-priming tanks, Cooling water pump, cooling water pipeline, hot air pipeline and circulating water solution pipeline; the circulating water outlet of the liquid collector in the washing section is connected to the inlet of the circulating water solution pipeline; The inlet of the circulation tank is connected, the other is connected to the inlet of the filter, the outlet of the filter is connected to the inlet of the circulating water solution of the air heat exchanger, the outlet of the circulating water solution of the air heat exchanger is connected to the inlet of the circulating water solution of the plate heat exchanger, plate type The outlet of the circulating water solution of the heat exchanger is connected to the inlet of the washing circulation tank; the outlet of the washing circulation tank is divided into two routes, one is connected to the inlet of the washing circulation pump, the other is connected to the inlet of the flushing water pump of the demister, and the outlet of the washing circulation pump The outlet is connected to the feed port of the circulating water flushing distributor, the outlet of the demister flushing water pump is connected to the flushing port of the demister; the power plant cooling tower reservoir is connected to the self-priming tank; the inlet of the cooling water pump is connected to the self-priming tank , the outlet is connected to the inlet of the cooling water pipe, the outlet of the cooling water pipe is connected to the cooling water inlet of the plate heat exchanger, the cooling water outlet of the plate heat exchanger is connected to the reservoir of the cooling water tower of the power plant; the outlet of the centrifugal fan is connected to the air exchange The inlet port of the heater is connected, the outlet port of the air heat exchanger is connected with the inlet port of the steam heater, the outlet port of the steam heater is connected with the hot air pipe, and the hot air pipe is connected with the tower outlet chimney of the desulfurization tower; the power plant waste heat steam The pipeline is connected with the steam inlet of the steam heater, and the steam outlet of the steam heater is connected with the steam pipeline of the power plant.
本发明还包括排水地坑，冷却水管道的出口与排水地坑连接。The invention also includes a drainage pit, and the outlet of the cooling water pipeline is connected with the drainage pit.
本发明所述的板式换热器的冷却水出口与排水地坑连接。The cooling water outlet of the plate heat exchanger of the present invention is connected with the drainage pit.
本发明所述的离心风机为两台，一用一备。There are two centrifugal blowers of the present invention, one for use and one for standby.
一种氨法脱硫塔烟气消白结构的运行方法，其特征在于：过程如下：A method for operating an ammonia-based desulfurization tower flue gas whitening structure, characterized in that the process is as follows:
水洗段集液器收集的循环水溶液依次经过过滤器过滤、空气换热器降温、板式换热器降温后进入水洗循环槽；离心风机向空气换热器鼓入空气对循环水溶液进行一级降温；由冷却水泵从电厂冷却水塔蓄水池内将工艺水泵入板式换热器，对一级降温后的循环水溶液进行二级降温，工艺水再回到电厂冷却水塔蓄水池重复循环利用，而降低温度后的循环水溶液的再进入水洗循环槽，通过水洗循环泵将降温后的循环水溶液送入循环水冲洗分布器对烟气进行再喷淋降温；The circulating aqueous solution collected by the liquid collector in the washing section is filtered through the filter, cooled by the air heat exchanger, and then cooled by the plate heat exchanger, and then enters the water washing circulation tank; the centrifugal fan blows air into the air heat exchanger to cool the circulating aqueous solution at the first level; The cooling water pump pumps the process water into the plate heat exchanger from the cooling water tower reservoir of the power plant, and performs secondary cooling on the circulating aqueous solution after the first cooling, and the process water returns to the cooling tower storage tank of the power plant for repeated recycling, thereby reducing the temperature The final circulating aqueous solution enters the water washing circulation tank again, and the cooled circulating aqueous solution is sent to the circulating water flushing distributor through the water washing circulating pump to spray the flue gas again to cool down;
电厂余热蒸汽管道的蒸汽进入蒸汽加热器，对已经过空气换热器一级加热出来的空气进行二级加热，加热后的空气通过热风管道进入塔出口烟囱，与净烟气充分混合，使得最终排出烟囱的净烟气温度被提高，达到烟气除湿消白的目的。The steam from the waste heat steam pipeline of the power plant enters the steam heater, and performs secondary heating on the air that has been heated by the air heat exchanger in the first stage. The temperature of the net flue gas discharged from the chimney is increased to achieve the purpose of dehumidification and whitening of the flue gas.
本发明与现有技术相比，具有以下优点和效果：Compared with the prior art, the present invention has the following advantages and effects:
1、本发明对脱硫塔内已净化的烟气用被冷却的循环水连续多次喷淋冷却降温，低温的循环水降低了排烟温度和排烟的含湿量，从而降低进入烟囱的烟气中水汽的含量，进入烟囱的除湿后的烟气通过蒸汽加热器的热风混合升温后经烟囱出口排放，达到烟气消白的目的，且符合环保、节能要求，具有显著的经济、社会效益。1. In the present invention, the purified flue gas in the desulfurization tower is continuously sprayed and cooled by the cooled circulating water for multiple times. The low-temperature circulating water reduces the exhaust gas temperature and the moisture content of the exhaust gas, thereby reducing the smoke entering the chimney. The content of water vapor in the air, the dehumidified flue gas entering the chimney is mixed with the hot air of the steam heater and then discharged through the chimney outlet to achieve the purpose of whitening the flue gas, and meets the requirements of environmental protection and energy saving, and has significant economic and social benefits .
2、可利用已有的氨法脱硫塔装置，在不改变原有氨法脱硫塔结构的基础上进行消白改造，改造工艺路线简单，成本低。2. The existing ammonia desulfurization tower device can be used to carry out whitening transformation without changing the structure of the original ammonia desulfurization tower. The transformation process route is simple and the cost is low.
3、由循环水去空气换热器之前管路上设置过滤器，过滤器可以过滤掉有可能会堵塞、腐蚀后续换热装置的杂质，很好地解决了换热器无法避免的堵塞问题，使循环水溶液冷却系统工作更稳定。3. A filter is installed on the pipeline before the circulating water goes to the air heat exchanger. The filter can filter out impurities that may block and corrode the subsequent heat exchange device, which solves the unavoidable blockage problem of the heat exchanger. The circulating water cooling system works more stably.
4、利用空气换热器对循环水溶液进行一次降温的同时，对离心风机出口空气进行一级加热，即达到很好的换热效果又能降低装置能耗；板式换热器是利用电厂已有的冷却塔蓄水池内的工艺水，对从已经过空气换热器一级冷却降温后的循环水再进行二级降温，循环的工艺水再回到冷却塔蓄水池重复利用，符合环保、节能要求。4. While using the air heat exchanger to cool the circulating aqueous solution once, the outlet air of the centrifugal fan is heated at the same time, which not only achieves a good heat exchange effect but also reduces the energy consumption of the device; the plate heat exchanger uses the existing power plant The process water in the cooling tower reservoir is used for secondary cooling of the circulating water that has been cooled by the air heat exchanger for the first stage, and the circulated process water is returned to the cooling tower reservoir for reuse, which is in line with environmental protection, Energy saving requirements.
5、低温的循环水通过塔内水冲洗分布器系统对烟气进行再喷淋降温，降低塔内净烟气的温度，进而达到降低塔内烟气含湿量的目的。5. The low-temperature circulating water passes through the water flushing distributor system in the tower to spray and cool the flue gas again, reducing the temperature of the clean flue gas in the tower, and then achieving the purpose of reducing the moisture content of the flue gas in the tower.
6、通过降低循环水的温度，使得水洗段和除雾段烟气中的NH3在喷淋、除雾工艺过程中更易溶解到循环水中，氨气逃逸量更少、脱硫净烟气洁净度更高。6. By lowering the temperature of the circulating water, the NH 3 in the flue gas in the water washing section and the demisting section is more easily dissolved into the circulating water during the spraying and demisting process, the amount of ammonia escape is less, and the cleanliness of the desulfurized flue gas is improved. higher.
7、不仅达到了烟气消白的目的，且结构紧凑、方法简单、运行稳定、投资低、消白效率高。7. It not only achieves the purpose of whitening the flue gas, but also has compact structure, simple method, stable operation, low investment and high whitening efficiency.
附图说明Description of drawings
图1是本发明实施例的局部结构示意图一。FIG. 1 is a schematic diagram of a partial structure of an embodiment of the present invention.
图2是本发明实施例的局部结构示意图二。Fig. 2 is a second schematic diagram of the partial structure of the embodiment of the present invention.
图3是本发明实施例的局部结构示意图三。FIG. 3 is a third schematic diagram of a partial structure of an embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图并通过实施例对本发明作进一步的详细说明，以下实施例是对本发明的解释而本发明并不局限于以下实施例。The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.
参见图1-图3，本发明实施例包括脱硫塔1、过滤器12、空气换热器13、板式换热器14、循环水溶液旁路管道15、水洗循环槽16、除雾器冲洗水泵17、水洗循环泵18、蒸气加热器19、离心风机20、电厂余热蒸汽管道21、电厂冷却水塔蓄水池22、自吸罐23、冷却水泵24、冷却水管道25、排水地坑26、热风管道28、循环水溶液管道29和电厂蒸汽管道30。Referring to Figures 1-3, the embodiment of the present invention includes a desulfurization tower 1, a filter 12, an air heat exchanger 13, a plate heat exchanger 14, a circulating aqueous solution bypass pipe 15, a water washing circulation tank 16, and a demister flushing water pump 17 , water washing circulation pump 18, steam heater 19, centrifugal fan 20, power plant waste heat steam pipeline 21, power plant cooling tower reservoir 22, self-priming tank 23, cooling water pump 24, cooling water pipeline 25, drainage pit 26, hot air pipeline 28. Circulating aqueous solution pipeline 29 and power plant steam pipeline 30.
脱硫塔1由下往上依次设置有氧化段2、预洗段3、吸收段集液器5、吸收段6、下层除雾器7、水洗段集液器8、循环水冲洗分布器9、上层除雾器11、塔出口烟囱4。脱硫塔1的下部设置有塔进口烟道27，塔进口烟道27位于预洗段3的下方。The desulfurization tower 1 is provided with an oxidation section 2, a prewashing section 3, an absorption section liquid collector 5, an absorption section 6, a lower demister 7, a water washing section liquid collector 8, a circulating water flushing distributor 9, and an oxidation section 2 from bottom to top. Upper demister 11, tower outlet chimney 4. The lower part of the desulfurization tower 1 is provided with a tower inlet flue 27 , and the tower inlet flue 27 is located below the prewashing section 3 .
水洗段集液器8的循环水出口与循环水溶液管道29的进口连接；循环水溶液管道29的出口分为两路，一路通过循环水溶液旁路管道15与水洗循环槽16的进口连接，进行消白时，循环水溶液旁路管道15关闭，不进行消白时，循环水溶液旁路管道15打开；循环水溶液管道29出口的另一路与过滤器12的进口连接，过滤器12的出口与空气换热器13的循环水溶液进口连接，空气换热器13的循环水溶液出口与板式换热器14的循环水溶液进口连接，板式换热器14的循环水溶液出口与水洗循环槽16的进口连接，水洗循环槽16的出口分为两路，一路与水洗循环泵18的进口连接，另一路与除雾器冲洗水泵17的进口连接，水洗循环泵18的出口与循环水冲洗分布器9的进料口连接，除雾器冲洗水泵17的出口与下层除雾器7和上层除雾器11的冲洗口连接。The outlet of the circulating water of the liquid collector 8 of the washing section is connected to the inlet of the circulating aqueous solution pipeline 29; the outlet of the circulating aqueous solution pipeline 29 is divided into two paths, and one path is connected to the inlet of the water washing circulation tank 16 through the circulating aqueous solution bypass pipeline 15 to carry out whitening , the circulating aqueous solution bypass pipeline 15 is closed, and when whitening is not carried out, the circulating aqueous solution bypass pipeline 15 is opened; the other way of the circulating aqueous solution pipeline 29 outlets is connected with the inlet of the filter 12, and the outlet of the filter 12 is connected with the air heat exchanger The inlet of the circulating water solution of 13 is connected, the outlet of the circulating water solution of the air heat exchanger 13 is connected with the inlet of the circulating water solution of the plate heat exchanger 14, the outlet of the circulating water solution of the plate heat exchanger 14 is connected with the inlet of the water washing circulation tank 16, and the water washing circulation tank 16 The outlet of the water-washing circulation pump is divided into two routes, one is connected with the inlet of the water washing circulation pump 18, the other is connected with the inlet of the demister flushing water pump 17, and the outlet of the water-washing circulation pump 18 is connected with the feed inlet of the circulating water flushing distributor 9, except The outlet of the fogger flushing water pump 17 is connected with the flushing ports of the lower layer demister 7 and the upper layer demister 11 .
电厂冷却水塔蓄水池22通过自吸泵与自吸罐23连接。冷却水泵24的进口与自吸罐23连接，出口与冷却水管道25的进口连接，冷却水管道25的出口分为两路，一路与板式换热器14的冷却水进口连接，另一路与排水地坑26连接。板式换热器14的冷却水出口与电厂冷却水塔蓄水池22和排水地坑26连接。The power plant cooling water tower reservoir 22 is connected with the self-priming tank 23 through a self-priming pump. The inlet of the cooling water pump 24 is connected to the self-priming tank 23, and the outlet is connected to the inlet of the cooling water pipeline 25. The outlet of the cooling water pipeline 25 is divided into two routes, one is connected with the cooling water inlet of the plate heat exchanger 14, and the other is connected with the drain Pit 26 is connected. The cooling water outlet of the plate heat exchanger 14 is connected with the power plant cooling water tower reservoir 22 and the drainage pit 26 .
离心风机20的出口与空气换热器13的进气接口连接，空气换热器13的出气接口与蒸气加热器19的进气接口连接，蒸汽加热器19的出气接口与热风管道28连接，热风管道28与脱硫塔1的塔出口烟囱4连接。电厂余热蒸汽管道21与蒸汽加热器19的蒸汽进口连接，蒸汽加热器19的蒸汽出口与电厂蒸汽管道30连接。离心风机20为两台，一用一备。The outlet of centrifugal fan 20 is connected with the inlet port of air heat exchanger 13, and the outlet port of air heat exchanger 13 is connected with the inlet port of steam heater 19, and the outlet port of steam heater 19 is connected with hot blast pipeline 28, and hot blast Pipeline 28 is connected with tower outlet chimney 4 of desulfurization tower 1 . The waste heat steam pipeline 21 of the power plant is connected with the steam inlet of the steam heater 19 , and the steam outlet of the steam heater 19 is connected with the steam pipeline 30 of the power plant. Centrifugal fan 20 is two, one is used and the other is prepared.
烟气流向：来自系统外的原烟气通过塔进口烟道27进入脱硫塔1，被预洗段3的预洗循环液降温洗涤，与此同时借助原烟气的预热来浓缩预洗循环液；烟气被吸收段集液器5收集循环水后上升经过吸收段6，被吸收循环液洗涤脱硫，并且被下层除雾器7除雾、水洗段集液器8收集循环水，然后烟气再经过两级的循环水冲洗分布器9，被冷却循环水溶液除去细微颗粒物并降低温度，并且被上层除雾器11除雾；最后净烟气从塔出口烟囱4排出。Flue gas flow direction: the original flue gas from outside the system enters the desulfurization tower 1 through the tower inlet flue 27, and is cooled and washed by the pre-washing circulating liquid in the pre-washing section 3, and at the same time, the pre-washing cycle is concentrated by preheating the original flue gas Liquid; the flue gas is collected by the liquid collector 5 in the absorption section and rises through the absorption section 6, where it is washed and desulfurized by the absorbed circulating liquid, and is demisted by the lower layer demister 7, and the circulating water is collected by the liquid collector 8 in the washing section, and then the smoke The gas passes through the two-stage circulating water flushing distributor 9, is cooled by the circulating water solution to remove fine particles and lowers the temperature, and is demisted by the upper demister 11; finally, the net flue gas is discharged from the tower outlet chimney 4.
循环水溶液流向：水洗段集液器8收集循环水冲洗分布器9喷淋后下来的循环水溶液，然后循环水溶液依次经过过滤器12过滤、空气换热器13降温、板式换热器14降温后进入水洗循环槽16；离心风机20向空气换热器13鼓入空气对循环水溶液进行一级降温；由冷却水泵24从电厂冷却水塔蓄水池22内将工艺水泵入板式换热器14，对一级降温后的循环水溶液进行二级降温，降低温度后的循环水溶液的再进入水洗循环槽16，通过水洗循环泵18将降温后的循环水溶液送入循环水冲洗分布器9对烟气进行再喷淋降温，达到降低塔内净烟气的温度、降低塔内烟气含湿量的目的。Circulating aqueous solution flow direction: the liquid collector 8 of the washing section collects the circulating water solution after the circulating water rinses the distributor 9 and sprays it, and then the circulating aqueous solution is filtered by the filter 12, cooled by the air heat exchanger 13, and cooled by the plate heat exchanger 14. The water washing circulation tank 16; the centrifugal fan 20 blows air into the air heat exchanger 13 to carry out a first-stage cooling of the circulating aqueous solution; the cooling water pump 24 pumps the process water into the plate heat exchanger 14 from the cooling water tower reservoir 22 of the power plant. The circulating aqueous solution after the first stage of cooling is subjected to secondary cooling, and the circulating aqueous solution after lowering the temperature enters the washing circulation tank 16, and the circulating aqueous solution after cooling is sent to the circulating water flushing distributor 9 through the washing circulating pump 18 to spray the flue gas again. The purpose of cooling down is to reduce the temperature of the net flue gas in the tower and reduce the moisture content of the flue gas in the tower.
蒸汽-热空气流向：电厂余热蒸汽管道21的蒸汽进入蒸汽加热器19，对已经过空气换热器13一级加热出来的空气进行二级加热，加热后的空气通过热风管道28进入塔出口烟囱4，与净烟气充分混合，使得最终排出烟囱的净烟气温度被提高到≥80℃，达到烟气除湿消白的目的。蒸汽加热器19出口安装疏水装置，换热后的蒸汽再进入综合管架上的电厂蒸汽管道30。Steam-hot air flow direction: the steam from the waste heat steam pipe 21 of the power plant enters the steam heater 19, and performs secondary heating on the air that has been heated by the air heat exchanger 13, and the heated air enters the tower outlet chimney through the hot air pipe 28 4. It is fully mixed with the clean flue gas, so that the temperature of the net flue gas finally discharged from the chimney is raised to ≥ 80 ° C, and the purpose of dehumidification and whitening of the flue gas is achieved. The outlet of steam heater 19 is equipped with draining device, and the steam after heat exchange enters the power plant steam pipeline 30 on the comprehensive pipe rack.
冷却水流向：电厂冷却水塔蓄水池22内的工艺水用冷却水泵24泵入板式换热器14，对从已经过空气换热器13一级冷却降温后的循环水溶液再进行二级降温，工艺水再回到电厂冷却水塔蓄水池22重复循环利用。Cooling water flow direction: the process water in the cooling water tower reservoir 22 of the power plant is pumped into the plate heat exchanger 14 by the cooling water pump 24, and the circulating aqueous solution that has been cooled by the air heat exchanger 13 is cooled by the second stage. The process water returns to the cooling water tower reservoir 22 of the power plant for repeated recycling.
此外，需要说明的是，本说明书中所描述的具体实施例，其零、部件的形状、所取名称等可以不同，本说明书中所描述的以上内容仅仅是对本发明结构所作的举例说明。凡依据本发明专利构思所述的构造、特征及原理所做的等效变化或者简单变化，均包括于本发明专利的保护范围内。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，只要不偏离本发明的结构或者超越本权利要求书所定义的范围，均应属于本发明的保护范围。In addition, it should be noted that the specific embodiments described in this specification may be different in parts, shapes and names of parts, and the above content described in this specification is only an illustration of the structure of the present invention. All equivalent changes or simple changes made according to the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in the claims. All should belong to the protection scope of the present invention.
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