CN211936311U - Gas power generation boiler waste gas desulfurization and denitrification system - Google Patents

Gas power generation boiler waste gas desulfurization and denitrification system Download PDF

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CN211936311U
CN211936311U CN202020518234.6U CN202020518234U CN211936311U CN 211936311 U CN211936311 U CN 211936311U CN 202020518234 U CN202020518234 U CN 202020518234U CN 211936311 U CN211936311 U CN 211936311U
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denitrification
gas
desulfurization
flue gas
dedusting
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吕文彬
沈先锋
周赟
訾朝辉
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Anhui Fangxin Lihua Environmental Protection Technology Co ltd
Tongxing Environmental Protection Technology Co ltd
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Abstract

本实用新型公开了一种燃气发电锅炉废气脱硫脱硝系统,包括纯干法脱硫塔、除尘脱硝一体化反应器和增压风机。所述纯干法脱硫塔通过管道连接有除尘脱硝一体化反应器,所述除尘脱硝一体化反应器与增压风机相连接。所述除尘脱硝一体化反应器包括布袋、喷吹系统、灰斗、烟气均化模块一、辅助加热系统、喷氨格栅、烟气均化模块二和脱硝催化剂。所述除尘脱硝一体化反应器内部从下至上依次安装有布袋、烟气均化模块一、辅助加热系统、喷氨格栅、烟气均化模块二和脱硝催化剂。可实现高效脱除烟气中SO2、粉尘以及低温SCR脱硝的目的,且在系统运行过程中无二次污染,便于维护,能耗低、占地面积小、易于操作。

Figure 202020518234

The utility model discloses a gas-fired power generation boiler waste gas desulfurization and denitrification system, which comprises a pure dry desulfurization tower, a dust removal and denitrification integrated reactor and a booster fan. The pure dry desulfurization tower is connected with a dedusting and denitrification integrated reactor through a pipeline, and the dedusting and denitrification integrated reactor is connected with a booster fan. The dedusting and denitration integrated reactor includes a cloth bag, an injection system, an ash hopper, a flue gas homogenization module 1, an auxiliary heating system, an ammonia injection grille, a flue gas homogenization module 2 and a denitration catalyst. The inside of the integrated dedusting and denitrification reactor is sequentially installed with a cloth bag, a flue gas homogenization module 1, an auxiliary heating system, an ammonia injection grille, a flue gas homogenization module 2 and a denitration catalyst from bottom to top. It can achieve the purpose of efficiently removing SO 2 , dust and low-temperature SCR denitrification in flue gas, and there is no secondary pollution during system operation, easy maintenance, low energy consumption, small footprint, and easy operation.

Figure 202020518234

Description

一种燃气发电锅炉废气脱硫脱硝系统A gas-fired power generation boiler waste gas desulfurization and denitrification system

技术领域technical field

本实用新型涉及废气脱硫脱硝设备技术领域,尤其涉及一种燃气发电锅炉废气脱硫脱硝系统。The utility model relates to the technical field of waste gas desulfurization and denitration equipment, in particular to a gas-fired power generation boiler waste gas desulfurization and denitration system.

背景技术Background technique

随着我国业工业化进程的不断加深,燃煤燃气等行业排放了大量的有害烟尘及有害气体,比如二氧化硫及各种含氮化合物,这导致局部地区形成了酸雨,光化学烟雾等。近些年来SO2、NOx在环境污染物中所占比重越来越大。为了长远可持续发展,国家对污染物的排放标准越来越严格。With the continuous deepening of the industrialization process in my country, coal-fired gas and other industries emit a large amount of harmful soot and harmful gases, such as sulfur dioxide and various nitrogen-containing compounds, which lead to the formation of acid rain and photochemical smog in local areas. In recent years, the proportion of SO 2 and NO x in environmental pollutants is increasing. For long-term sustainable development, the state's emission standards for pollutants are becoming more and more stringent.

近年来,随着中国雾霾频发,火力发电等重点行业的污染物排放状况受到了更多关注。自2016年以来,中国燃煤电厂逐步开始实施超低排放改造,改造后其主要污染物(烟尘、SO2和NOx)可达到国家对燃气机组的排放限值要求,部分电厂NOx排放浓度已达到25mg/m3的水平。众所周知,由于燃料特性的不同,燃气发电相比燃煤发电更为清洁高效,但随着燃煤电厂实施超低排放改造,燃气电厂的环保优势受到挑战。特别是近年来气电装机容量的迅速扩充,加之燃气电厂主要位于经济发达、环境敏感区域,所以其环保问题已日益凸显。因而我们需要使用脱硫脱硝设备来尽可能去除这些污染物质,达到排放标准。In recent years, with the frequent occurrence of smog in China, more attention has been paid to the pollutant emissions of key industries such as thermal power generation. Since 2016, China's coal-fired power plants have gradually implemented ultra-low emission transformation. After the transformation, their main pollutants (smoke, SO 2 and NO x ) can meet the national emission limit requirements for gas-fired units, and the NO x emission concentration of some power plants A level of 25 mg/m 3 has been reached. As we all know, due to different fuel characteristics, gas-fired power generation is cleaner and more efficient than coal-fired power generation. However, with the implementation of ultra-low emission transformation of coal-fired power plants, the environmental advantages of gas-fired power plants are challenged. Especially in recent years, the installed capacity of gas power has rapidly expanded, and gas-fired power plants are mainly located in economically developed and environmentally sensitive areas, so their environmental protection problems have become increasingly prominent. Therefore, we need to use desulfurization and denitrification equipment to remove these pollutants as much as possible and meet the emission standards.

现有的烟气过滤系统很难同时满足高效的脱硫、除尘和脱硝,且还会造成二次污染。同时目前市场上其它单独的脱硫、除尘、脱硝简单整合一起有能耗高、占地大、设备运行繁琐的缺点。经检测,中国专利201420179488.6,名称为:一种电厂锅炉脱硫脱硝处理系统,该申请案包括脱硫塔、喷淋装置、烟气冷却装置、氧化风机和锅炉旋风分离器,喷淋装置设置在所述脱硫塔中,烟气冷却装置连接电厂锅炉的出尘口,锅炉旋风分离器连接所述烟气冷却装置另一端,并且将所述氧化风机连接所述脱硫塔。但是该申请案采用喷氨水脱硝,在其所述温度45-55℃并不能使氨水有效的还原氮氧化物达到高脱硝率的目的。另外,其所采用的湿法脱硫技术会产生废水造成二次污染。不能满足日趋严格的环保要求。The existing flue gas filtration system is difficult to satisfy the high-efficiency desulfurization, dust removal and denitrification at the same time, and also causes secondary pollution. At the same time, the simple integration of other separate desulfurization, dust removal and denitrification on the market has the disadvantages of high energy consumption, large land occupation and cumbersome equipment operation. After testing, the Chinese patent 201420179488.6 is named: A desulfurization and denitrification treatment system for a power plant boiler. The application includes a desulfurization tower, a spray device, a flue gas cooling device, an oxidation fan and a boiler cyclone separator. In the desulfurization tower, the flue gas cooling device is connected to the dust outlet of the power plant boiler, the boiler cyclone is connected to the other end of the flue gas cooling device, and the oxidation fan is connected to the desulfurization tower. However, this application adopts ammonia spray for denitrification, and the stated temperature of 45-55°C cannot effectively reduce nitrogen oxides with ammonia to achieve the purpose of high denitration rate. In addition, the wet desulfurization technology it adopts will produce waste water and cause secondary pollution. Can not meet the increasingly stringent environmental protection requirements.

另外,省煤器出口废气温度较低,为了避免脱硝过程中再热增加能耗。因此寻找一种能耗低、占地面积小、易于操作、可以低温脱硝的脱硫脱硝设备来高效的去除烟气中的污染物刻不容缓。这既符合市场需求,也能对环保事业做出贡献。In addition, the temperature of the exhaust gas at the outlet of the economizer is relatively low, in order to avoid reheating during the denitration process and increase the energy consumption. Therefore, it is urgent to find a desulfurization and denitrification equipment with low energy consumption, small footprint, easy operation, and low temperature denitrification to efficiently remove pollutants in flue gas. This not only meets market demand, but also contributes to environmental protection.

实用新型内容Utility model content

本实用新型的目的在于提供一种燃气发电锅炉废气脱硫脱硝系统,可实现高效脱除烟气中SO2、粉尘以及低温SCR脱硝的目的,且在系统运行过程中无二次污染,便于维护,能耗低、占地面积小、易于操作,解决了现有技术中的问题。The purpose of the utility model is to provide a gas-fired power generation boiler waste gas desulfurization and denitration system, which can achieve the purpose of efficiently removing SO 2 , dust and low-temperature SCR denitrification in the flue gas, and has no secondary pollution during the operation of the system, which is convenient for maintenance. Low energy consumption, small footprint, and easy operation solve the problems in the prior art.

为实现上述目的,本实用新型提供如下技术方案:To achieve the above object, the utility model provides the following technical solutions:

本实用新型的一种燃气发电锅炉废气脱硫脱硝系统,为实现脱硫脱硝除尘的目的,包括纯干法脱硫塔、除尘脱硝一体化反应器、增压风机,燃气发电锅炉废气SO2含量不高,采用干法脱硫,由于燃气发电锅炉生产过程中省煤器出口温度较低,为避免烟气再热造成能耗增加,所以采用低温SCR脱硝催化剂来催化脱除烟气中的NOx。但是,考虑到废气中的SO2和烟气粉尘中的碱金属、碱土金属、重金属对低温SCR脱硝催化剂有较大的堵塞和毒化作用,因此脱硫塔和布袋除尘器布置在脱硝反应器上游。另外为了减少设备占地面积,采用除尘脱硝一体化装置。所述纯干法脱硫塔通过管道连接有除尘脱硝一体化反应器,所述除尘脱硝一体化反应器的顶端通过管道与增压风机相连接;The utility model is a gas-fired power generation boiler waste gas desulfurization and denitrification system, in order to achieve the purpose of desulfurization, denitrification and dust removal, it includes a pure dry desulfurization tower, a dust removal and denitrification integrated reactor, a booster fan, and the gas power generation boiler waste gas SO 2 content is not high, Dry desulfurization is adopted. Due to the low outlet temperature of the economizer during the production process of the gas-fired power boiler, in order to avoid the increase in energy consumption caused by the reheating of the flue gas, a low-temperature SCR denitration catalyst is used to catalyze the removal of NO x in the flue gas. However, considering that SO 2 in the exhaust gas and alkali metals, alkaline earth metals and heavy metals in the flue gas dust have a great clogging and poisoning effect on the low-temperature SCR denitration catalyst, the desulfurization tower and the bag filter are arranged upstream of the denitration reactor. In addition, in order to reduce the footprint of the equipment, an integrated device for dust removal and denitrification is adopted. The pure dry desulfurization tower is connected with a dedusting and denitrification integrated reactor through a pipeline, and the top of the dedusting and denitrification integrated reactor is connected with a booster fan through a pipeline;

所述纯干法脱硫塔包括脱硫塔主体、研磨系统和脱硫剂喷枪,所述脱硫剂喷枪安装于脱硝塔主体的侧壁上,且与研磨系统相连接;The pure dry desulfurization tower comprises a desulfurization tower main body, a grinding system and a desulfurization agent spray gun, and the desulfurization agent spray gun is installed on the side wall of the denitration tower main body and is connected with the grinding system;

所述除尘脱硝一体化反应器包括布袋、喷吹系统、灰斗、烟气均化模块一、喷氨格栅、烟气均化模块二和脱硝催化剂,所述除尘脱硝一体化反应器内部从下至上依次安装有布袋、烟气均化模块一、辅助加热系统、喷氨格栅、烟气均化模块二和脱硝催化剂,所述布袋的上端安装有喷吹系统,所述除尘脱硝一体化反应器的下端安装有灰斗。The dedusting and denitrification integrated reactor includes a cloth bag, an injection system, an ash hopper, a flue gas homogenization module 1, an ammonia injection grille, a flue gas homogenization module 2 and a denitration catalyst. From bottom to top, a cloth bag, a flue gas homogenization module 1, an auxiliary heating system, an ammonia injection grille, a flue gas homogenization module 2 and a denitration catalyst are installed in sequence. An ash hopper is installed at the lower end of the reactor.

优选的,所述灰斗和布袋之间的侧壁上设有除尘器进气口,纯干法脱硫塔通过除尘器进气口连接除尘脱硝一体化反应器内部空腔。Preferably, a dust collector inlet is provided on the side wall between the ash hopper and the cloth bag, and the pure dry desulfurization tower is connected to the inner cavity of the integrated dedusting and denitrification reactor through the dust collector inlet.

优选的,所述所述烟气均化模块一和烟气均化模块二均为多层孔板,孔板上开设有通孔,相邻孔板上的通孔相互交错。Preferably, the first flue gas homogenization module and the second flue gas homogenization module are multi-layer orifice plates, the orifice plates are provided with through holes, and the through holes on adjacent orifice plates are staggered.

优选的,所述脱硝催化剂为低温SCR脱硝催化剂。Preferably, the denitration catalyst is a low temperature SCR denitration catalyst.

优选的,所述辅助加热系统用于控制废气的温度,使催化剂的处在最佳的温度活性窗口。Preferably, the auxiliary heating system is used to control the temperature of the exhaust gas, so that the catalyst is in an optimal temperature activity window.

与现有技术相比,本实用新型的有益效果如下:Compared with the prior art, the beneficial effects of the present utility model are as follows:

本实用新型的燃气发电锅炉废气脱硫脱硝系统,采用干法脱硫,节约了成本,且可以同时实现脱硫除尘脱硝。采用低温SCR脱硝催化剂,解决了以往省煤器出口烟气温度较低难以高效脱除NOx的问题,也避免了废气再热脱硝造成的资源浪费。废气依次通过纯干法脱硫塔1和除尘段后再通过脱硝段,可以有效降低废气中的粉尘、SO2、碱金属、碱土金属、重金属对脱硝催化剂的堵塞和毒化作用,增加了脱硝催化剂12的使用寿命。采用了除尘脱硝一体化反应器,占地面积小,简化了设备,易于操作,投资少,无二次污染。The gas-fired power generation boiler waste gas desulfurization and denitrification system of the utility model adopts dry desulfurization, which saves the cost, and can simultaneously realize desulfurization, dust removal and denitrification. The use of low-temperature SCR denitration catalyst solves the problem that the flue gas temperature at the exit of the economizer is low and it is difficult to efficiently remove NOx , and also avoids the waste of resources caused by exhaust gas reheating and denitration. The exhaust gas passes through the pure dry desulfurization tower 1 and the dust removal section in turn, and then passes through the denitration section, which can effectively reduce the clogging and poisoning of the denitration catalyst by dust, SO 2 , alkali metals, alkaline earth metals and heavy metals in the exhaust gas, and increase the denitration catalyst 12 service life. The integrated reactor for dust removal and denitration is adopted, which occupies a small area, simplifies the equipment, is easy to operate, requires less investment, and has no secondary pollution.

附图说明Description of drawings

图1为本实用新型的整体结构图;Fig. 1 is the overall structure diagram of the utility model;

图2为本实用新型的纯干法脱硫塔结构图;Fig. 2 is the pure dry process desulfurization tower structural diagram of the present utility model;

图3为本实用新型的除尘脱硝一体化反应器结构图;Fig. 3 is the structure diagram of the integrated dedusting and denitrification reactor of the utility model;

图4为本实用新型的烟气均化模块一和烟气均化模块二结构图。FIG. 4 is a structural diagram of a first flue gas homogenization module and a second flue gas homogenization module of the present invention.

图中:1、纯干法脱硫塔;2、除尘脱硝一体化反应器;3、增压风机;4、研磨系统;5、脱硫剂喷枪;6、布袋;7、喷吹系统;8、灰斗;9、烟气均化模块一;10、喷氨格栅;11、烟气均化模块二;12、脱硝催化剂;13、脱硫塔主体;14、除尘器进气口;15、辅助加热系统;16、孔板;17、通孔。In the figure: 1. Pure dry desulfurization tower; 2. Integrated reactor for dust removal and denitrification; 3. Booster fan; 4. Grinding system; 5. Desulfurizer spray gun; 6. Cloth bag; Bucket; 9. Flue gas homogenization module 1; 10. Ammonia injection grille; 11. Flue gas homogenization module 2; 12. Denitrification catalyst; 13. Main body of desulfurization tower; System; 16. Orifice plate; 17. Through hole.

具体实施方式Detailed ways

下面将结合本实用新型实施例中的附图,对本实用新型实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本实用新型一部分实施例,而不是全部的实施例。基于本实用新型中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本实用新型保护的范围。The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

请参阅图1,一种燃气发电锅炉废气脱硫脱硝系统,包括纯干法脱硫塔1、除尘脱硝一体化反应器2和增压风机3。纯干法脱硫塔1的上游连接有省煤器,省煤器通过引风机连接有燃气发电锅炉,燃气发电锅炉产生的废气通过引风机从主省煤器出口引出,而后进入纯干法脱硫塔1脱硫,纯干法脱硫塔1通过管道连接有除尘脱硝一体化反应器2,除尘脱硝一体化反应器2的顶端通过管道与增压风机3相连接,由增压风机3提供动力,使烟气在此系统中流动,之后洁净烟气进入空气预热器,最后送入烟囱排出烟气。Please refer to FIG. 1 , a gas-fired power generation boiler waste gas desulfurization and denitrification system, including a pure dry desulfurization tower 1 , a dust removal and denitrification integrated reactor 2 and a booster fan 3 . The upstream of the pure dry desulfurization tower 1 is connected with an economizer, and the economizer is connected with a gas power generation boiler through an induced draft fan. 1 Desulfurization, pure dry desulfurization tower 1 is connected with a dedusting and denitrification integrated reactor 2 through a pipeline, and the top of the dedusting and denitrification integrated reactor 2 is connected with a booster fan 3 through a pipeline, which is powered by the booster fan 3 to make the smoke The gas flows in this system, and then the clean flue gas enters the air preheater, and finally is sent to the chimney to discharge the flue gas.

请参阅图2,纯干法脱硫塔1包括脱硫塔主体13、研磨系统4和脱硫剂喷枪5。脱硫剂喷枪5安装于脱硫塔主体13的侧壁上,且与研磨系统4相连接,废气与纯干法脱硫塔1中的二氧化硫反应实现脱硫。燃气发电锅炉产生废气通过引风机从主省煤器出口引出,首先进入脱硫塔内,脱硫剂由研磨系统4先研磨成一定目数,再经由脱硫剂喷枪5喷入脱硫塔与废气混合达到脱硫的目的。纯干法脱硫塔1通过除尘器进气口14连接除尘脱硝一体化反应器2内部空腔。Please refer to FIG. 2 , the pure dry desulfurization tower 1 includes a desulfurization tower main body 13 , a grinding system 4 and a desulfurization agent spray gun 5 . The desulfurization agent spray gun 5 is installed on the side wall of the desulfurization tower main body 13, and is connected to the grinding system 4, and the exhaust gas reacts with the sulfur dioxide in the pure dry desulfurization tower 1 to realize desulfurization. The exhaust gas generated by the gas-fired power generation boiler is drawn from the outlet of the main economizer through the induced draft fan, and first enters the desulfurization tower. The desulfurization agent is first ground into a certain mesh by the grinding system 4, and then sprayed into the desulfurization tower through the desulfurization agent spray gun 5 to mix with the exhaust gas to achieve desulfurization the goal of. The pure dry desulfurization tower 1 is connected to the internal cavity of the integrated dedusting and denitrification reactor 2 through the air inlet 14 of the dust collector.

请参阅图3,除尘脱硝一体化反应器2包括布袋6、喷吹系统7、灰斗8、烟气均化模块一9、喷氨格栅10、烟气均化模块二11、脱硝催化剂12和辅助加热系统15。除尘脱硝一体化反应器2内部从下至上依次安装有布袋6、烟气均化模块一9、辅助加热系统15、喷氨格栅10、烟气均化模块二11和脱硝催化剂12。布袋6、喷吹系统7和灰斗8位于脱硫塔主体13的下端形成除尘段,脱硫后的废气进入除尘段。其中,布袋6的上端安装有喷吹系统7,除尘脱硝一体化反应器2的下端安装有灰斗8,灰斗8和布袋6之间的侧壁上设有除尘器进气口14。通过布袋6的过滤净化作用,使粉尘被拦截在滤袋表面,达到除尘的效果。布袋6上积聚的粉尘在喷吹系统7的定期吹扫下落入除尘器灰斗8,并经输灰系统进入储灰仓等待外运。烟气均化模块一9、辅助加热系统15、喷氨格栅10、烟气均化模块二11和脱硝催化剂12位于脱硫塔主体13的上端形成脱硝段。其中,烟气均化模块一9和烟气均化模块二11均为多层孔板16,孔板16上开设有通孔17,相邻孔板16上的通孔17相互交错,使烟气混合均匀。辅助加热系统15用于控制废气的温度,使催化剂的处在最佳的温度活性窗口。通过喷氨格栅10喷入的氨气分散性更好。脱硝催化剂12为低温SCR脱硝催化剂12,在脱硝催化剂12的催化作用下NOx被氨气在低温条件下还原达到脱硝的目的。Please refer to FIG. 3 , the integrated dedusting and denitrification reactor 2 includes a cloth bag 6 , an injection system 7 , an ash hopper 8 , a flue gas homogenization module 1 9 , an ammonia injection grill 10 , a flue gas homogenization module 2 11 , and a denitration catalyst 12 and auxiliary heating system 15. The dust removal and denitrification integrated reactor 2 is sequentially installed with a cloth bag 6 , a flue gas homogenization module 1 9 , an auxiliary heating system 15 , an ammonia injection grill 10 , a flue gas homogenization module 2 11 and a denitration catalyst 12 from bottom to top. The bag 6, the injection system 7 and the ash hopper 8 are located at the lower end of the main body 13 of the desulfurization tower to form a dedusting section, and the desulfurized exhaust gas enters the dedusting section. Wherein, the upper end of the bag 6 is installed with the injection system 7, the lower end of the integrated denitration and denitration reactor 2 is installed with an ash hopper 8, and the side wall between the ash hopper 8 and the bag 6 is provided with a dust collector air inlet 14. Through the filtering and purifying function of the cloth bag 6, the dust is intercepted on the surface of the filter bag to achieve the effect of dust removal. The dust accumulated on the cloth bag 6 falls into the ash hopper 8 of the dust collector under the regular purging of the injection system 7, and enters the ash storage bin through the ash conveying system for external transportation. The first flue gas homogenization module 9 , the auxiliary heating system 15 , the ammonia injection grill 10 , the second flue gas homogenization module 11 and the denitration catalyst 12 are located at the upper end of the main body 13 of the desulfurization tower to form a denitration section. Among them, the flue gas homogenization module 1 9 and the flue gas homogenization module 2 11 are both multi-layer orifice plates 16, the orifice plate 16 is provided with through holes 17, and the through holes 17 on the adjacent orifice plates 16 are staggered with each other, so that the smoke The air is mixed evenly. The auxiliary heating system 15 is used to control the temperature of the exhaust gas so that the catalyst is in the optimum temperature activity window. The ammonia gas injected through the ammonia injection grid 10 has better dispersibility. The denitration catalyst 12 is a low-temperature SCR denitration catalyst 12. Under the catalytic action of the denitration catalyst 12, NOx is reduced by ammonia gas under low temperature conditions to achieve the purpose of denitration.

系统工作流程:System workflow:

燃气发电锅炉产生的废气通过引风机从省煤器出口引出。首先进入脱硫塔内,脱硫剂由研磨系统4先研磨成一定目数,再经由脱硫剂喷枪5喷入脱硫塔与废气混合达到脱硫的目的。其次,脱硫之后的废气从除尘器进气口14进入除尘脱硝一体化反应器2,通过布袋6的过滤净化作用,使粉尘被拦截在滤袋表面,达到除尘的效果。布袋6上积聚的粉尘在喷吹系统7的定期吹扫下落入除尘器灰斗8,并经输灰系统进入储灰仓等待外运。之后经脱硫除尘之后的烟气进入脱硝段,先经过烟气均化模块一9使废气流速及流向均匀,接着再与经喷氨格栅10喷入的氨气和辅助加热系统15喷入的热空气在烟气均化模块二11的均化作用下混合均匀,在气体到达催化剂表面时催化NOx与NH3和O2反应成无害的气体,脱除废气中的NOx,达到排放的标准。The exhaust gas produced by the gas-fired power boiler is drawn out from the outlet of the economizer through the induced draft fan. First into the desulfurization tower, the desulfurization agent is first ground into a certain mesh by the grinding system 4, and then sprayed into the desulfurization tower through the desulfurization agent spray gun 5 to mix with the exhaust gas to achieve the purpose of desulfurization. Secondly, the exhaust gas after desulfurization enters the integrated dedusting and denitrification reactor 2 from the air inlet 14 of the dust collector, and the dust is intercepted on the surface of the filter bag through the filtering and purifying effect of the cloth bag 6 to achieve the effect of dust removal. The dust accumulated on the cloth bag 6 falls into the ash hopper 8 of the dust collector under the regular purging of the injection system 7, and enters the ash storage bin through the ash conveying system for external transportation. After that, the flue gas after desulfurization and dust removal enters the denitrification section, first through the flue gas homogenization module 1 9 to make the exhaust gas flow rate and flow uniform, and then with the ammonia gas injected through the ammonia injection grill 10 and the auxiliary heating system 15. The hot air is uniformly mixed under the homogenization of the flue gas homogenization module 2 11, and when the gas reaches the catalyst surface, it catalyzes the reaction of NO x with NH 3 and O 2 into a harmless gas, removes NO x in the exhaust gas, and achieves emission standard.

最后,高效脱除废气中的粉尘、SO2和NOx的洁净烟气经增压风机3输送到空气预热器,经换热之后送入烟囱排放。Finally, the clean flue gas that efficiently removes dust, SO 2 and NO x from the exhaust gas is transported to the air preheater through the booster fan 3, and then sent to the chimney for discharge after heat exchange.

综上所述:本实用新型的燃气发电锅炉废气脱硫脱硝系统,采用干法脱硫,节约了成本。采用低温SCR脱硝催化剂12,解决了以往省煤器出口烟气温度较低难以高效脱除NOx的问题,也避免了废气再热脱硝造成的资源浪费。废气依次通过纯干法脱硫塔1和除尘段后再通过脱硝段,可以有效降低废气中的粉尘、SO2、碱金属、碱土金属、重金属对脱硝催化剂12的堵塞和毒化作用,增加了脱硝催化剂12的使用寿命。采用了除尘脱硝一体化反应器2,占地面积小,简化了设备,易于操作,投资少,无二次污染。To sum up, the gas-fired power generation boiler waste gas desulfurization and denitrification system of the present invention adopts dry desulfurization, which saves the cost. The use of the low-temperature SCR denitration catalyst 12 solves the problem that the flue gas temperature at the exit of the economizer is low and it is difficult to efficiently remove NOx , and also avoids the waste of resources caused by the reheating and denitration of the exhaust gas. The exhaust gas passes through the pure dry desulfurization tower 1 and the dust removal section in turn, and then passes through the denitration section, which can effectively reduce the clogging and poisoning of the denitration catalyst 12 by dust, SO 2 , alkali metals, alkaline earth metals and heavy metals in the exhaust gas, and increase the denitration catalyst. 12 service life. The integrated reactor 2 for dust removal and denitrification is adopted, which occupies a small area, simplifies the equipment, is easy to operate, requires less investment, and has no secondary pollution.

需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

尽管已经示出和描述了本实用新型的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本实用新型的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本实用新型的范围由所附权利要求及其等同物限定。Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1.一种燃气发电锅炉废气脱硫脱硝系统,包括纯干法脱硫塔(1)、除尘脱硝一体化反应器(2)和增压风机(3),其特征在于:所述纯干法脱硫塔(1)通过管道连接有除尘脱硝一体化反应器(2),所述除尘脱硝一体化反应器(2)的顶端通过管道与增压风机(3)相连接,所述纯干法脱硫塔(1)包括脱硫塔主体(13)、研磨系统(4)和脱硫剂喷枪(5),所述脱硫剂喷枪(5)安装于脱硫塔主体(13)的侧壁上,且与研磨系统(4)相连接,所述除尘脱硝一体化反应器(2)包括布袋(6)、喷吹系统(7)、灰斗(8)、烟气均化模块一(9)、喷氨格栅(10)、烟气均化模块二(11)、脱硝催化剂(12)和辅助加热系统(15),所述除尘脱硝一体化反应器(2)内部从下至上依次安装有布袋(6)、烟气均化模块一(9)、辅助加热系统(15)、喷氨格栅(10)、烟气均化模块二(11)和脱硝催化剂(12),所述布袋(6)的上端安装有喷吹系统(7),所述除尘脱硝一体化反应器(2)的下端安装有灰斗(8)。1. A gas-fired power generation boiler waste gas desulfurization and denitration system, comprising a pure dry desulfurization tower (1), a dust removal and denitrification integrated reactor (2) and a booster fan (3), characterized in that: the pure dry desulfurization tower (1) A dedusting and denitrification integrated reactor (2) is connected through a pipeline, and the top of the dedusting and denitrification integrated reactor (2) is connected with a booster fan (3) through a pipeline, and the pure dry desulfurization tower ( 1) comprising a desulfurization tower main body (13), a grinding system (4) and a desulfurization agent spray gun (5), the desulfurization agent spray gun (5) being installed on the side wall of the desulfurization tower main body (13), and being connected with the grinding system (4); ) are connected, and the integrated dedusting and denitrification reactor (2) includes a cloth bag (6), a blowing system (7), an ash hopper (8), a flue gas homogenization module one (9), an ammonia injection grill (10). ), a second flue gas homogenization module (11), a denitration catalyst (12) and an auxiliary heating system (15). The first homogenization module (9), the auxiliary heating system (15), the ammonia injection grid (10), the second flue gas homogenization module (11) and the denitration catalyst (12), the upper end of the cloth bag (6) is provided with a spraying nozzle (12). A blowing system (7), an ash hopper (8) is installed at the lower end of the integrated dedusting and denitration reactor (2). 2.根据权利要求1所述的一种燃气发电锅炉废气脱硫脱硝系统,其特征在于:所述灰斗(8)和布袋(6)之间的侧壁上设有除尘器进气口(14),纯干法脱硫塔(1)通过除尘器进气口(14)连接除尘脱硝一体化反应器(2)内部空腔。2. A gas-fired power generation boiler waste gas desulfurization and denitrification system according to claim 1, characterized in that: a dust collector air inlet (14) is provided on the side wall between the ash hopper (8) and the cloth bag (6). ), the pure dry desulfurization tower (1) is connected to the inner cavity of the dust removal and denitrification integrated reactor (2) through the air inlet (14) of the dust collector. 3.根据权利要求1所述的一种燃气发电锅炉废气脱硫脱硝系统,其特征在于:所述烟气均化模块一(9)和烟气均化模块二(11)均为多层孔板(16),孔板(16)上开设有通孔(17),相邻孔板(16)上的通孔(17)相互交错。3. A gas-fired power generation boiler waste gas desulfurization and denitrification system according to claim 1, wherein the first (9) flue gas homogenization module and the second (11) flue gas homogenization module are multi-layer orifice plates (16), the orifice plate (16) is provided with through holes (17), and the through holes (17) on adjacent orifice plates (16) are staggered. 4.根据权利要求1所述的一种燃气发电锅炉废气脱硫脱硝系统,其特征在于:所述脱硝催化剂(12)为低温SCR脱硝催化剂。4. A gas-fired power generation boiler exhaust gas desulfurization and denitration system according to claim 1, wherein the denitration catalyst (12) is a low temperature SCR denitration catalyst. 5.根据权利要求1所述的一种燃气发电锅炉废气脱硫脱硝系统,其特征在于:所述辅助加热系统(15)用于控制废气的温度,使催化剂的处在最佳的温度活性窗口。5. A gas-fired power generation boiler exhaust gas desulfurization and denitrification system according to claim 1, characterized in that: the auxiliary heating system (15) is used to control the temperature of the exhaust gas, so that the catalyst is in an optimal temperature activity window.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112316592A (en) * 2020-11-30 2021-02-05 北京中航泰达环保科技股份有限公司 Sintering flue gas circulation combined denitration and dust removal integrated device
CN115155302A (en) * 2022-06-20 2022-10-11 成都易态科技有限公司 Treatment system and treatment method for furnace gas of fuming furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112316592A (en) * 2020-11-30 2021-02-05 北京中航泰达环保科技股份有限公司 Sintering flue gas circulation combined denitration and dust removal integrated device
CN115155302A (en) * 2022-06-20 2022-10-11 成都易态科技有限公司 Treatment system and treatment method for furnace gas of fuming furnace
CN115155302B (en) * 2022-06-20 2023-12-08 成都易态科技有限公司 Treatment system and treatment method for fuming furnace gas

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