Water working medium injection type heat pump system realizing cascaded recovery of waste heat and working method thereof

Abstract

The invention provides a water working medium injection type heat pump system realizing cascaded recovery of waste heat and a working method thereof. The heat pump system comprises a high-pressure water vapor generation system, a low-pressure water vapor generation system, a water vapor injection system and a water vapor compression heat supply system, wherein the high-pressure water vapor generation system and the low-pressure water vapor generation system are connected through a waste heat connection pipe (3); the high-pressure water vapor generation system and the water vapor injection system are connected through a high-pressure gas storage tank (28); the low-pressure water vapor generation system and the water vapor injection system are connected through a low-pressure gas storage tank (34); the water vapor injection system and the water vapor compression heat supply system are connected through the high-pressure gas storage tank (28) and a medium-pressure gas storage tank (15); and the high-pressure water vapor generation system and the water vapor compression heat supply system are connected through the high-pressure gas storage tank (28).

Description

technical field [0001] The invention relates to the field of heat pump systems, in particular to a hydraulic medium injection heat pump system for cascaded waste heat recovery. Background technique [0002] The recovery and utilization of low-grade waste heat refers to the high-grade reuse of low-grade waste heat in the production and living process, thereby effectively reducing the consumption of primary energy and improving the efficiency of primary energy utilization. According to the statistics of the International Energy Agency, industry is the largest area of ​​heat energy consumption, accounting for about 46% of the world's total heat energy consumption; according to my country's National Statistical Yearbook, in recent years, my country's annual industrial energy consumption has exceeded 2.9 billion tons of standard coal. Due to the low efficiency of energy utilization, the industry produces a large amount of low-grade waste heat, accounting for more than 14% of the ...

AI Technical Summary

Problems solved by technology

The heat pump experiment of water working medium shows that as the evaporation temperature and pressure decrease, the vacuum degree that the compressor in the system needs to provide is further increased, which leads to a sharp decline in the performance of the system, and also reduces the practicability and economy of the heat pump system

Therefore, in order to ensure the performance of the hydraulic heat pump system, it is necessary to reduce the vacuum in the evaporator and increase the corresponding evaporation temperature. The increase in the evaporation temperature requires a higher temperature waste heat source, thereby reducing the available temperature of the waste heat source. The lower temperature waste heat source cannot be recycled, which narrows the temperature range of waste heat recovered by hydraulic heat pumps, and also reduces the amount of waste heat that can be recovered by hydraulic heat pumps, thereby reducing the economy of hydraulic heat pumps and practicality

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