Dust removal equipment technology can be divided into three categories according to the relative time relationship between desulfurization and coal combustion: desulfurization before combustion, desulfurization during combustion, and desulfurization after combustion. 1 Desulfurization before combustion - Desulfurization of raw materials: Desulfurization of coal by washing with different specific gravity. The method has low desulfurization efficiency, cannot remove organic sulfur, and has the problem of treatment of slime water.
Under normal circumstances, the desulfurization enrollment rate is only 17%. The other type is desulfurization in the coal form conversion, such as desulfurization in the process of coal gasification and liquefaction. 2 Desulfurization in combustion - Combustion and sulfur fixation: A sulfur-fixing agent is added to the coal. In the combustion, the alkaline substance added by the coal or the sulfur-fixing agent reacts to form sulfate, which is removed as slag to reduce the sulfur dioxide content in the flue gas. The flue gas desulfurization method can be divided into three types: dry type, wet type and semi-dry and semi-wet according to the dry and wet state of the product formed by desulfurization. Among them, dry type adopts powdery or granular absorbent or catalyst to remove sulfur dioxide in flue gas, which has the advantages of short process, no sewage and dirty acid discharge, but has low desulfurization efficiency, large equipment, complicated operation and little use.
Semi-dry method-spray drying method, in which the absorbent emulsion is sprayed into the flue gas by the fine emulsion droplets in the spray tower, and the emulsion droplets are reacted with the sulfur dioxide in the flue gas while being evaporated and dried by the high temperature flue gas to form a dry state. A mixed powder of sulfite or sulfate to achieve the purpose of desulfurization. This method has the advantages of high efficiency of wet desulfurization, no sewage in dry process and discharge of acid and acid. Wet flue gas desulfurization uses an alkaline liquid absorbent to scrub the flue gas and absorb sulfur dioxide in the flue gas to form sulfite or sulfate. The wet flue gas desulfurization method has the advantages of small equipment, easy operation, mature technology, high desulfurization efficiency, stability, economy and practicality, etc. It is a widely used flue gas desulfurization and denitration project.
Boiler desulfurization and dust removal equipment flue gas desulfurization and denitration technology detection method:
1 Detection method: The sampling method adopts the determination method of sulfur dioxide in the exhaust gas of fixed pollution source in the national standard method.
2 Instruments and equipment: The smoke sampling tester using Yiqing flue gas dedusting technology, the model is 3012H, and the instrument is valid within the inspection period.
3 Inspectors: All inspectors are those who have passed the environmental monitoring training of the Autonomous Region Environmental Protection Agency and obtained the certificate.
4 Sampling point layout: The sampling points are arranged in the vertical and horizontal flue, which is 6 times larger than the turning, which meets the sampling specifications.
5 Boiler operation status: The test time is in the middle of the heating period. December is the colder weather in Hohhot. The boiler room is continuously heated at a constant temperature to ensure that the outlet water temperature is controlled at 60 °C. The return water temperature is controlled at 50 °C. The boiler under test is operating normally. And stable, supporting equipment drum, induced draft fan, coal mining machine coal machine normal operation, computer monitoring normal operation, to ensure that the boiler is in constant operation.