tailieunhanh - Air Pollution Control Systems for Boiler and Incinerators Part 7

Tham khảo tài liệu 'air pollution control systems for boiler and incinerators part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | TM 5-815-1 AFR 19-6 . Amy Corp of EngineerB Figure 8-lf. Bus sections vs. efficiency for different sulfur percentages in coal. b. High voltage transformer. The standard iron core transformer is the only instrument generally used to step-up the input voltage. The only care that need be taken is that the transformer is of superior quality and able to put out the quantity of voltage required by the precipitator. Transformers are designed to withstand high ambient temperatures and electrical variations induced by sparking. For high temperature operation the most common transformer cooling method is liquid immersion. c. High voltage rectifier. Silicon rectifiers are the latest advance in rectifying circuitry. They are solid state devices which have a few of the disadvantages of the other types of rectifiers. An assembly of silicon rectifiers is used for lower rated current sets typically 500 miliamperes mA . d. Voltage and amperage controls. Controls are needed to insure that the precipitator is supplied with the maximum amount of voltage or power input and to control the effects of sparking. The most modern method of accomplishing these aims is through the use of silicon controlled rectifiers SCR . Other modern control devices are saturable reactors and thyristors four element solid state devices . Voltage control can also be accomplished by tapped series dropping resistors series rheostats tapped transformer primaries and variable inductances. e. Auxiliary control equipment. As with any control 8-6 TM 5-815-1 AFR 19-6 device gas flow should be monitored either by readout of amperage from the fans or by measuring static pressure. It is also useful to have sensors which measure the sulfur dioxide SO2 concentration and temperature of the inlet gas stream in order to determine the dew-point temperature. 8-8. Advantages and disadvantages a. Advantages. 1 The pressure drop through a precipitator is a function of inlet and outlet design and precipitator length. Pressure .

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