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Development and Application of Deaerators
Release time:
2021-01-21
Desuperheating and pressure reducing deviceWidely used in the power, petrochemical, metallurgical, mechanical, textile, papermaking, heating and refrigeration industries, where steam and hot water are used as power sources. However, due to the needs of the manufacturing process, the parameters of various industries often do not match the boiler steam parameters or the turbine extraction parameters. Therefore, this desuperheating and pressure reducing device can reduce the temperature and pressure of steam delivered from power plants, industrial boilers, and thermal power plants, so that the temperature and pressure of the steam can meet the requirements of the production process.
With the rapid development of modern power plant units, a large number of high-parameter units with large flow rates are used, and various large-range variable conditions exist everywhere, especially the large flow range, large temperature and pressure reduction changes, and traditional desuperheating and pressure reducing devices can no longer meet the needs of modern units under variable operating conditions. Because the performance of the desuperheating and pressure reducing device directly affects the performance of the entire working group, soDesuperheating and pressure reducing deviceit is also a very crucial component.
Initially, the desuperheating and pressure reducing device was of a separate type for temperature reduction and pressure reduction, with a water spray cooling valve using a feed water distribution valve (with return water), a fixed nozzle (constant flow area), and an angular stroke actuator.
After thatDesuperheating and pressure reducing deviceit was a combination of temperature reduction and pressure reduction (temperature reduction and pressure reduction are completed in the same valve), the water spray cooling valve uses a water distribution valve (with return water), the nozzle uses a fixed type (constant flow area), and the actuator uses an angular stroke type.
Currently, desuperheating and pressure reducing devices are basically desuperheating and pressure reducing devices with a two-seat balanced structure and desuperheating and pressure reducing devices with a single-seat sleeve structure. The double-seat structure is not easy to seal, and the leakage is large. The desuperheating and pressure reducing device valve plate has small holes, and the flow area of the desuperheating water nozzle remains unchanged. When the flow rate changes greatly, the atomization effect of the superheated water cannot meet the requirements of use.
The single-seat sleeve structureDesuperheating and pressure reducing deviceis a single-seat sleeve structure with an atomizing nozzle installed inside. The structure is complex, the internal cavity volume is large, and a double-ball structure is also used. The inlet and outlet are not at the same level, the body is too large, the cost is higher, and they are all single-adjustment types, which cannot meet the requirements of complex process parameters.
Currently, the desuperheating and pressure reducing devices used are pressure reduction systems composed of desuperheating and pressure reducing valves and orifice plates; the water supply system is composed of water supply regulating valves, throttling valves, check valves, etc.; the safety protection system is composed of safety valves and steam pipes, etc., composed of three parts, and automatically controlled by a thermal control device to reduce the steam temperature to the process requirements.
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