Hot liquid injection multi-unit vapor compression device and heat pump

Abstract

The invention discloses an efficient hot liquid injection multi-unit vapor compression device and heat pump, and belongs to the field of compressors and heat pumps. According to the hot liquid injection multi-unit vapor compression device, pressurized saturated steam condensate, namely hot liquid, is used for compressing low-grade steam or secondary steam with the same component, due to the fact that the temperature of the hot liquid is high, condensation of the low-grade steam or the secondary steam is not generated, the low-grade steam or the secondary steam is compressed in high-speed two-phase flow, the whole compression process is carried out under the condition that a large amount of hot liquid exists. More than 80% of energy is consumed to increase temperature and be overheated, and less than 20% of energy is used for pressurization when thermal insulation compression is carried out as an MVR, all mechanical compressors and a vapor injection heat pump; the energy consumption is low and the supercharge ratio is high; a heat pump formed by the heat pump, an evaporator, a rectifying tower and the like can complete target production capacity without generating steam and cooling water by a boiler, so that the purposes of greenness, low carbon, carbon reduction and efficiency improvement are achieved; in addition, the second-stage expansion separation chamber is used as a second-stage expansion evaporation chamber of the evaporator and has the characteristics of high evaporation efficiency and good gas-liquid separation; the application field is very wide.

Description

technical field [0001] The invention relates to the fields of compressors and heat pumps, in particular to a thermal liquid injection multi-unit vapor compression device and a heat pump. Background technique [0002] As we all know: the utilization of low-grade steam or secondary steam is a major issue in today's energy saving and emission reduction, green low-carbon economy, carbon neutrality and circular economy. [0003] In the prior art, the following methods are generally adopted to realize the energy-saving utilization of low-grade steam or secondary steam. [0004] 1. Mechanical vapor recompression technology, referred to as MVR (mechanical vapor recompression) [0005] MVR is an energy-saving technology that re-uses the energy of the secondary steam generated by evaporation to reduce the demand for external energy. Its working process is to compress the secondary steam through the MVR compressor, increase the temperature and pressure, and increase the enthalpy, and ...

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Problems solved by technology

The bigger problem is that the steam needed in the process is generated by burning or consuming energy, such as coal, oil, etc., which are produced by boilers. The burning of energy not only produces carbon dioxide emissions (that is, carbon emissions) and harmful gas emissions, but also Waste residue, waste liquid, etc. are discharged; the secondary steam condensation has to use a large amount of circulating water, and the circulating water discharges its heat to the atmosphere through the circulating water cooling tower by means of water evaporation or heating air, resulting in a large amount of waste heat discharge into the atmosphere, pollute the environment, and raise the temperature

With the same pressure energy and small nozzle, the flow rate is relatively small. The degree of dispersion of the superheated condensate sprayed after the nozzle is high, and the efficiency of compressing the secondary steam is high. On the contrary, as the nozzle diameter increases, the flow rate also increases correspondingly, and the superheated condensate behind the nozzle The degree of dispersion will drop sharply, and the efficiency of compressing the secondary steam will also drop sharply. That is to say, the use of the existing jet suction device to compress the secondary steam has limited utilization capacity and more limited application range.

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