The application and configuration of the screw air compression system in the power industry are described below.
First, the thermal power station
The compressed air in the thermal power station is mainly introduced by the instrument compressed air system, the factory miscellaneous compressed air system, the water disposal compressed air system and the ash removal compressed air system: four different places.
1. Control the instrument with compressed air system:
The operation of a thermal power generating unit requires a large number of control instruments to support the operation. The operation of these control instruments is controlled by compressed air. The air pressure for controlling the pressure of the instrument is usually 0.650.70Mpa. Generally, the 2300MW thermal power can be determined according to the capacity of the thermal power unit.
The meter uses compressed air for 40 units. Considering that the thermal power unit is usually in operation, the demand for compressed air in two processes is sometimes large and sometimes small. When the gas consumption is less than 20m3/min. One of the 20m3/min screw air compressors will automatically stop. That is, compressed air can not stop the special requirements of compressed air at any time. Therefore, the configuration of the air compressor requires two installations and one maintenance. Of course, the configuration of many thermal power plants is not exactly the same. After the air compressor is selected. Because of the compression of air, we must consider the quality of compressed air. According to the air, the quality of the compressed air is high. The quality level of compressed air for instrumentation ISO/DP8573/188 is generally set to 2-3-2, ie solid particle level 2; water content 3; oil content 2 level. past. The instrument uses a compressed air injection screw compressor to develop slowly. Domestically used 2Z3/82Z3/ usually use oil-free reciprocating air compressor to produce. The outstanding advantages of the screw air compressor now determine the phasing out of the reciprocating air compressor. The technical level of air purification equipment has improved, and more. The compressed air oil screw air compressor and air purification equipment can be achieved by spraying. Quality requirements. Of course, oil-free screw air compressors are also possible but economically. It is easier to run and maintain. The use of oil-injected screw air compressors is less expensive.
2. Factory miscellaneous compressed air system:
Like purging pipes. The amount of gas used is generally determined by the size of the power station and its use, for example: a 2300 MW thermal power unit. The amount of gas used in the factory miscellaneous compressed air is generally up to two 20m3/min screws. The compressed air is used to purge the pipeline or to supply the compressor for the machine. Used for pneumatic tools, etc. Moreover, the quality of the misuse of compressed air is not high. Therefore, the general factory misuse of compressed air is like the compressed air of the instrument cannot stop the supply of air. The compressed air system does not need to be equipped. According to the requirements of the ISO/DP8573/183 specification. The quality requirement is 4-6-5, that is, the solid particles are 4 grades; the water content is 6 and the oil content is 5 grades.
3. Water treatment compressed air system:
The water treatment system of a hydropower station is generally divided into a boiler feed water treatment system and an industrial wastewater treatment system.
3.1 boiler feed water treatment system
The boiler feed water treatment system can be roughly due to the difference in water quality of the power plants. Divided into three major types. The better the water quality of each water treatment source, the simpler the water treatment system. There are some pneumatic diaphragm valves and pneumatic instruments between these valves and instrumentation systems. The action is achieved by compressed air. In general, the compressed air consumption is not very large. However, the quality of compressed air is high. For example, a boiler feed water treatment system of a power plant only needs one m33/min air compressor. Two m33/min were arranged to take into account factors such as the standby machine. Air compressor. The power plant's water treatment system requires a two-stage oil filtration and adsorption dryer for compressed air quality. Recommended according to the ISO/DP8573/188 specification. The quality requirements of the compressed air of the system are generally: 233, solid particle level 2; water content 3; oil content 3
3.2 Wastewater Treatment System
Wastewater treatment system. Because part of the compressed air is used in pneumatic equipment. For some devices, the other part of the compressed air is controlled by compressed air to agitate the wastewater (some power plants use a Roots blower for agitation). For different wastewater treatment equipment, this system uses different amounts of compressed air.
4. Air purification system for ash removal:
The ash removal system can be divided into a negative pressure ash removal system, a positive pressure ash removal system, a low positive pressure ash removal system and a hydraulic ash removal system according to different pressures. These four ash removal systems. The so-called positive pressure ash removal system requires a compressed air to remove ash. A method of forming a positive pressure for pressure transmission in an ash conveying pipe by using an air compressor and a warehouse pump. Among them, the warehouse pump is divided into a single warehouse pump and a multi-bin pump. The output of the system is mostly in the range of 10~60t/h. The distance is less than 1000m. The amount of compressed air required for multiple transport modes in a positive pressure ash removal system is also different.
Second, hydropower station
The screw air compressor is mainly used for the compressed air system of the instrument, the miscellaneous air system in the plant and the compressed air system for the power of the equipment. The instrumentation compressed air system of the hydropower station is the same as the instrumentation compressed air system of the thermal power station, but the gas consumption is different from that of the compressed air system of the instrument of the thermal power station. The requirements for the quality of the compressed air vary depending on the amount of gas used. The miscellaneous compressed air system in the plant is mainly used for equipment maintenance and pipe cleaning. The gas consumption is similar to that of the hybrid air system of the thermal power station, and the compressed air quality requirements are the same as those of the thermal power station miscellaneous system. The equipment power of the hydropower station is mainly used for the replacement between generator sets in the compressed air system. Moreover, the amount of gas used is relatively large, as well as the brakes of the generator set. The quality of the compressed air is similar to the quality of the compressed air used in the instrument.
Third, the nuclear power plant
In the application of screw air compressors in nuclear power plants, compared with thermal power plants, there may be only one ash removal system. The other three applications use screw air compressors. The capacity of air compressors can be determined according to the scale of the power station. . The requirements for compressed air quality can be set according to the corresponding system requirements of the thermal power station. In addition, fixed screw air compressors are also used in the construction of nuclear power plants.
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