Abstract:

In order to improve the safety and economy of pulverizing system, the optimization and adjustment test of bowl pulverizer pulverizing system of 300 MW boiler was carried out. The output characteristics of bowl pulverizer, separator baffle characteristics of pulverizer and the optimum ventilation rate of pulverizer were studied experimentally. The relationship curves between the baffle scale of separator and pulverized coal fineness, pulverized coal power consumption and bowl differential pressure were obtained. The test results show that with the increase of the baffle scale of the separator, the coal fineness decreases, the differential pressure of mill bowl increases, and the current of the coal pulverizer increases. According to the characteristic test of coal pulverizer, the optimum ventilation rate of coal pulverizer, the output of coal pulverizer and the control range of separator baffle opening were put forward. According to the operation condition of coal pulverizer, the suggestion of equipment defect inspection and repair was put forward. The unit consumption of coal pulverizer under optimum test condition is reduced by 8.5%, and the energy saving effect is obvious.

Key words: bowl pulverizer, operational characteristics, optimum ventilation rate, separator baffle adjustment