There are more and more waste gas generated by boiler combustion of diesel, mainly including SO2. NOX. soot, Ringmann blackness and other pollutants. If these pollutants are discharged into the atmosphere at will, they will have a very bad impact on the local ecological environment. In order to protect the integrity of China's ecological environment and the sustainable development of the environment and economy, boiler exhaust gas should be desulfurized.

目前，烟气脱硫脱硝处理技术多种多样，包括PAFP.ACFP.软锰矿法.电子束氨法.脉冲电晕法.石膏湿法.催化氧化法.微生物降解法等技术，其中湿法烟气脱硫脱硝快、常见。

At present, flue gas desulfurization and denitration treatment technologies are diverse, including PAFP, ACFP, pyrolusite process, electron beam ammonia process, pulse corona process, gypsum wet process, catalytic oxidation process, microbial degradation process and other technologies, among which wet flue gas desulfurization and denitration are fast and common.

常见的烟气脱硫方法包括干式脱硫和湿式脱硫。干式脱硫是利用催化剂和吸收剂去除烟气中的二氧化硫。不同的催化剂和吸附剂也有不同的作用。更广泛使用的吸收剂类型是氧化物和活性炭。虽然干式脱硫是有效的，但由于不能回收，吸收成本高。湿式脱硫和干式脱硫均采用高效液体吸收剂。石灰石和海水脱硫是湿式脱硫的主要操作方法。因此，我国绝大多数企业都使用湿式脱硫进行相关操作。

Common flue gas desulfurization methods include dry desulfurization and wet desulfurization. Dry desulfurization is to remove sulfur dioxide from flue gas by using catalyst and absorbent. Different catalysts and adsorbents also have different effects. The more widely used absorbent types are oxides and activated carbon. Although dry desulfurization is effective, it cannot be recovered and the absorption cost is high. High-efficiency liquid absorbent is used for wet desulfurization and dry desulfurization. Limestone and seawater desulfurization are the main operation methods of wet desulfurization. Therefore, most enterprises in China use wet desulfurization for relevant operations.

湿法烟气脱硫技术有很多优点：湿法烟气脱硫技术是气液反应，反应速度快，脱硫效率高，一般高于90%，技术成熟，应用广泛。湿法脱硫技术相对成熟，生产运行安全可靠，在众多脱硫技术中始终占据主导地位。

Wet flue gas desulfurization technology has many advantages: wet flue gas desulfurization technology is gas-liquid reaction, with fast reaction speed and high desulfurization efficiency, generally higher than 90%, mature technology and wide application. Wet desulfurization technology is relatively mature, safe and reliable in production and operation, and has always occupied a leading position in many desulfurization technologies.

烟气处理后，将烟气加热到350~400摄氏度，然后进入选择性催化还原反应器，是国外公司开发的湿洗脱硫脱硝技术的主要工艺，可将有害氮化物转化为无害氮。

After flue gas treatment, the flue gas is heated to 350~400 ℃, and then enters the selective catalytic reduction reactor. It is the main process of wet cleaning desulfurization and denitrification technology developed by foreign companies, which can convert harmful nitrogen compounds into harmless nitrogen.

目前，空气加热器也是常用的烟气加热器。循环风道加热器主要用于风道内的空气加热。循环风道加热器的规格分为低温、中温和高温。循环风道加热器在结构上的共同点是，采用钢板支撑循环风道加热器，以减少风机停止时循环风道加热器的振动。低温型可直接安装在循环风道加热器上，而中温型可直接安装在循环风道加热器上。由于高温型结构不同，通道外壁至加热器接线盒夹有保温材料。一方面，它减少了整个循环风道加热器通道的外部散热，另一方面，它也降低了接线腔内的温度。

At present, air heater is also a common flue gas heater. The circulating air duct heater is mainly used for air heating in the air duct. The specifications of the circulating air duct heater are divided into low temperature, medium temperature and high temperature. The common structural feature of the circulating air duct heater is that the steel plate is used to support the circulating air duct heater to reduce the vibration of the circulating air duct heater when the fan stops. The low temperature type can be directly installed on the circulating air duct heater, while the medium temperature type can be directly installed on the circulating air duct heater. Due to the different structure of high temperature type, thermal insulation materials are sandwiched between the outer wall of the channel and the heater junction box. On the one hand, it reduces the external heat dissipation of the whole circulating air duct heater channel, on the other hand, it also reduces the temperature in the wiring chamber.

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