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电厂低氮燃烧器与脱销技术

作者: 西安锅炉燃烧器 来源: 未知 时间: 2020-06-23 浏览次数:
跟着我国环保尺度的进一步提高,不克知足国度环保尺度排放的火力发电机组接踵进行了低氮或脱硝革新。机组在进行低氮燃烧器和脱硝系统革新后,在实际运行中NOx的排放量均能知足

跟着我国环保尺度的进一步提高,不克知足国度环保尺度排放的火力发电机组接踵进行了低氮或脱硝革新。机组在进行低氮燃烧器和脱硝系统革新后,在实际运行中NOx的排放量均能知足2011版《火力发电厂污染物排放尺度》要求,脱硝系统运行根基正常。
With the further improvement of China's environmental protection standards, coal-fired power units that cannot meet the national environmental protection standards have successively carried out low-nitrogen or denitrification transformation. In low nitrogen burner and denitration system after modification, in the actual operation of NOx emissions can meet the 2011 edition "coal-fired power plant emissions standard" requirement, denitration system running normally.


低氮燃烧器


1、低氮燃烧及脱硝手艺
1. Low-nitrogen combustion and denitrification technology

低氮燃烧机组首要是针对NOx的两种首要生成机理,在降低燃烧温度的同时,降低着火区域的氧气浓度。以按捺炉氮氧化物的生成。经由采用炉内低NOx燃烧手艺,能将NOx排放浓度降低30%~60%。今朝遍及采用的低氮燃烧手艺首要是经由低氮燃烧器革新,来实现炉内低氧、分级配分的燃烧特征,降低NOx的减排。
The low nitrogen combustion unit is mainly aimed at two main generating mechanisms of NOx, which reduce the oxygen concentration in the ignition area while reducing the combustion temperature. To inhibit the formation of furnace nitrogen oxides. By using the low NOx combustion technology in the furnace, the NOx emission concentration can be reduced by 30% ~ 60%. Currently, the commonly used low-nitrogen combustion technology is mainly through the transformation of low-nitrogen burner to realize the combustion characteristics of low-oxygen and graded blending in the furnace and reduce the emission reduction of NOx.

因为炉内低氮燃烧手艺的局限性,使得NOx的排放不克很好的知足环保要求,为进一步降低NOx的排放,必需对燃烧后的烟气进行脱硝处理。今朝通行的烟气脱硝工艺大致可分为干法、半干法和湿法3类。个中干法SCR脱硝工艺以其脱硝装配构造简洁、运行便利、靠得住性高、脱硝效率高、一次投资相对较低等诸多长处,在我国获得了普遍的贸易应用。
Due to the limitation of the low-nitrogen combustion technology in the furnace, the emission of NOx cannot meet the requirements of environmental protection. In order to further reduce the emission of NOx, it is necessary to denitrify the smoke after combustion. The current flue gas denitrification process can be divided into dry, semi-dry and wet processes. Including dry SCR denitration technology with its denitration device has simple structure, convenient operation and high reliability, high denitration efficiency, a lot of advantages, an investment is relatively low in our country has been widely commercial application.

SCR脱硝反响器按拍照对于除尘器的安装位置,可分为高含尘和低含尘两类。但因为低含尘需要安装蒸汽加热器和烟气换热器(GGH),系统复杂,投资大,故一样选择高含尘工艺。SCR装配首要由脱硝反响剂制备系统和回响器本体构成。
The SCR denitrification reactor can be divided into high dust content and low dust content according to the installation position of relative dust collector. However, because the low dust content requires the installation of steam heater and gas heat exchanger (GGH), the system is complex and the investment is large, so the high dust content technology is generally chosen. The SCR device is mainly composed of the preparation system of denitrification reaction agent and the reactor body.

经由向反映器内喷入脱硝回响剂NH3,将NOx还原为氮气和水蒸气。制氨一样有尿素、液氨、氨水等3种方式。今朝首要采用尿素和液氨两种制氨方式。脱硝催化剂其材料普通以TiO2为载体,并掺入V2O5和WO3等活性成分。催化剂的活性温度规模从300℃~420℃[3]不等。催化剂有蜂窝式和板式两种。
The NOx was reduced to nitrogen and water vapor by spraying the denitrification reagent NH3 into the reactor. Ammonia production generally has urea, liquid ammonia, ammonia water and other three methods. At present, urea and liquid ammonia are mainly used to make ammonia. The denitrification catalyst is usually supported by TiO2 and mixed with V2O5 and WO3. The activity of the catalyst temperature range from 300 ℃ to 420 ℃ range [3]. There are two kinds of catalyst, honeycomb and plate.

2、实施NOx减排的机组类型 2. NOx emission reduction unit type
今朝我国电厂在响应国度环保的号召下,NOx排放超标的火电厂均进行了响应的革新,按实施类型可分为四类: At present, China's power plants, under the call of the corresponding national environmental protection, have carried out corresponding transformation of the thermal power plants with excessive NOx emission, which can be divided into four types according to the implementation type:
(1)机组原设计为低氮燃烧体例及烟气脱硝装配。此类机组无需进行革新;  (1) the unit was originally designed as a low-nitrogen combustion mode and a flue gas denitrification device. Such units need not be modified;
(2)机组原设计低氮燃烧体式并预留安装脱硝装配;这种类型机组在设计时,考虑到脱硝装配的运行要求,在本次革新中,只加装脱硝装配;  (2) the original low-nitrogen combustion mode of the unit and the installation of denitrification device is reserved; In the design of this type of unit, considering the operation requirements of the denitrification device, only the denitrification device is added in the reconstruction.
(3)机组原设计为低氮燃烧体式,未预留脱硝安装位置;这种类型机组在设计时,未考虑到脱硝装配的运行要求,在本次革新中,加装脱硝装配,同时进行了响应的辅机革新; (3) the original design of the unit was low-nitrogen combustion mode, and no denitrification installation position was reserved; In the design of this type of unit, the operation requirements of denitrification device were not taken into account. In the reconstruction, denitrification device was added and corresponding auxiliary machine was also reformed.

机组之前未采用低氮燃烧体式,且无脱硝装配。此类机组在氮氧化物减排革新中,革新幅度大,低氮燃烧器革新以及加装脱硝装配。上述几种进行脱硝革新的机组,同时进行了空预器、除尘器以及引风机的革新。

No low nitrogen combustion method and no denitrification device have been used before. In the modification of nitrogen oxide reduction, the modification range is large, the modification of low nitrogen burner and the addition of denitrification device. The above mentioned denitrification units have been modified with air preheater, dust collector and fan.


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