1. Sewage treatment is used to provide aeration. The aeration function of sewage treatment is to enable activated sludge to carry out aerobic respiration, decompose organics into inorganic substances, and remove pollutants. Roots blower, as a kind of equipment that can provide compressed air, can send the air to the depth of several meters of water, and uniformly deliver the air to every corner of the sewage treatment pool through various aeration devices. In this way, the bacteria used for processing and decomposing organic pollutants have enough oxygen to survive and work continuously. According to different processes, the required pressure of these Roots blowers is generally 30-70KPa. Roots blowers are the sewage treatment aeration equipment with the lowest cost and highest efficiency at present.

2. Pneumatic conveying in ash removal of power plant Thermal power plants will produce a large amount of coal ash after the combustion of coal for power generation. If it is not well collected and utilized, it will cause great environmental pollution. Roots blower plays a key role in such a fly ash collection process. It uses the principle of pneumatic transmission to transport fly ash to the ash bin through the specified pipeline with compressed air for collection. The collected coal ash can be used as an important raw material for cement production, which not only solves the environmental problems, but also creates economic benefits for the power plant. The pressure of Roots blower for this purpose is generally about 50Ka.

3. Oxidation fan in desulfurization system of power plant. In the past five to six years, with the increasing attention paid to environmental protection by the state, more strict requirements have been put forward on the sulfur content in the waste gas emissions of power plants to solve the increasingly serious problem of acid rain. The desulfurization industry also ushered in unprecedented opportunities. Almost overnight, hundreds of desulfurization companies of different sizes appeared in China. Roots blower, as the core equipment in the desulfurization system, plays an extremely critical role in the normal operation of the whole desulfurization system. The general desulfurization process is to put waste gas into the desulfurization tower through the flue, and put calcium oxide slurry into the tower to fully react with the sulfur in the waste gas to finally generate calcium sulfite. In this chemical reaction process, a large amount of oxygen is required. Roots blower is such a device to transport a large amount of oxygen. Roots blowers used in this process are often characterized by large air volume and high pressure (the pressure is generally 70-120KPa), and have higher requirements for the reliability of fans. Therefore, in the two years before the construction of the desulfurization system, imported Roots blowers are generally used for reliability. However, in recent years, with the improvement of China's manufacturing capacity and the attention of Roots blower manufacturers to the desulfurization industry, In view of the characteristics of desulfurization and oxidation fans, many new products have been developed and technical improvements have been made, and more and more domestic roots have been applied in desulfurization.

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