Water-spray screw steam compressor

Abstract

The invention provides a water-spray screw steam compressor. Three seals are arranged between a working cavity of the compressor and a bearing cavity; steam seal is realized through spraying high-pressure liquid water in space between the first seal and the second seal; besides seal through spraying water, the steam absorbing superheat degree can be lowered through spraying water in a steam absorbing cavity to increase the mass flow rate of compressed steam; or water is sprayed in a compression cavity at the steam absorbing end moment to effectively lower the temperature of compressed steam and the steam discharging superheat degree, so that the working process of the compressor is similar to a constant temperature compression process, and the efficiency of the compressor is improved. A pressure stabilization tank is arranged on the steam discharging side of the compressor; the steam pressure in the pressure stabilization tank is adjusted to ensure efficient operation of the compressor under different working conditions. High-temperature water flowing out of a water route of the pressure stabilization tank is mixed with low-temperature softened water or distilled water, the mixed water enters a heat exchanger and is recycled to provide the steam heat of a user and to realize steam superheat degree adjustment; adjustment of temperature and flow of sprayed water can be realized through adjusting flow of the softened water, distilled water or water entering the heat exchanger.

Description

technical field [0001] The invention belongs to the technical field of mechanical steam recompression heat pumps, and relates to a water-spraying screw steam compressor. Background technique [0002] With the increasingly prominent energy problems, high-energy-consuming processes are facing technical requirements for energy-saving transformation. Mechanical vapor recompression technology uses a steam compressor to compress low-temperature steam, which can replace boiler steam after its temperature and pressure are increased. It can be used in different fields such as seawater desalination, sewage treatment, and lye recovery. [0003] Vapor compressor is the key to mechanical vapor recompression technology, and it is also the main technical difficulty and development limitation. Mechanical compressors are mostly rotating machines, which need to be equipped with oil-lubricated bearings. In order to ensure the quality of compressed steam, there must be a reliable seal between ...

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Problems solved by technology

[0005] Patent Document 2 proposes a method for controlling the amount of sprayed water, but since the latent heat of evaporation of water is significantly greater than its sensible heat absorption, it is hoped that the sprayed water will evaporate within a limited time within the working volume of the compressor, and in practical application , if the water spray temperature is too low, continuously increasing the water spray volume has no obvious effect on reducing the exhaust steam temperature, so when adjusting the water spray volume, it is also necessary to be able to adjust the water spray temperature according to the state of the compressor’s steam absorption

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