Lithium bromide absorption heat pump set used in field for recycling low temperature waste heat

Abstract

The invention belongs to the technical field of refrigeration equipment and relates to a lithium bromide absorption heat pump set used in the field for recycling low temperature waste heat. A high pressure evaporator, a high pressure absorber and a high temperature heat exchanger are additionally arranged in the pump set to carry out double-section absorption and double-section evaporation; an inner circulation pipeline is additionally arranged between a low pressure absorber and the high pressure evaporator; an inside circulation water pump is arranged on the pipeline; two circulation flows are formed in the pump set; in the first flow, heat of heat source water is recycled in a low pressure evaporator, and inside circulation warm water is circulated inside the low pressure absorber and the high pressure evaporator and sequentially enters the high pressure absorber and a condenser; and in the second flow, the heat source water sequentially enters the high pressure evaporator and the low pressure evaporator, and the warm water sequentially enters the low pressure absorber, the high pressure absorber and the condenser. In the invention, the technique principle of the double-section absorption and double-section evaporation is adopted, the absorber and the evaporator in each section are independently arranged and operated by utilizing different modes according to different working conditions, therefore, the purposes of recycling the low temperature waste heat efficiently and simultaneously producing the warm water with higher temperature are achieved.

Description

Technical field [0001] The invention relates to a lithium bromide absorption heat pump unit used in the field of recovering low-temperature waste heat, and belongs to the technical field of refrigeration equipment. Background technique [0002] Lithium bromide absorption heat pump is driven by thermal energy (steam, hot water, flue gas, fuel, etc.) to recover the heat of low-temperature heat source water and provide higher-temperature warm water, because of its high temperature and heating efficiency. It has the advantages of high capacity, large unit capacity, no pollution to the environment by using water as the refrigerant, and convenient unit maintenance and management. The unit is widely used in air conditioning, heating, hot water supply and other fields. At present, lithium bromide absorption heat pump units are mostly used in the occasions where the temperature of the heat source water is above 20℃, but in fact, there are more low-temperature waste heat below 20℃ in the e...

AI Technical Summary

Problems solved by technology

At present, lithium bromide absorption heat pump units are mostly used in places where the temperature of heat source water is above 20°C, but in fact, there are more low-temperature waste heat below 20°C in the environment, such as urban sewage, shallow geothermal energy, surface water, and northern regions. In winter, the cooling circulating water of power plants and waste hot water in factories, etc., are abundant in these low-temperature waste heat resources. Considering my country’s national conditions, the basic idea of ​​using these resources is to meet the central heating demand in winter in northern my country, so it is necessary to produce higher temperature Warm water (generally above 80°C), and traditional heat pump units cannot achieve such working conditions. The current main method is to use two units in series to increase the temperature. The problems caused by this are: 1. The operating efficiency of the unit is reduced by 20 %~30%

2. The initial investment is relatively high, and the project payback period increases by 30-40%

3. The system design is complex and occupies a large area

4. Inconvenient operation and adjustment

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