Ammonia and lithium bromide integrated absorption refrigeration device driven by heating medium water and method

Abstract

Provided are an ammonia and lithium bromide integrated absorption refrigeration device driven by heating medium water and a method. The device comprises an ammonia-water solution rectifying tower, an ammonia condenser, a liquid ammonia throttling valve, a liquid ammonia evaporator, a refrigerant ammonia absorber, an ammonia-water solution heat exchanger, an ammonia-water solution circulating pump, an ammonia-water solution reducing valve, a lithium bromide solution generator, a water vapor condenser, a water throttling valve, a water evaporator, a refrigerant water vapor absorber, a lithium bromide solution heat exchanger, a lithium bromide solution circulating pump and a lithium bromide solution reducing valve. An ammonia absorption refrigeration system and a lithium bromide absorption refrigeration system are integrated through heating medium water and chilled water energy flows. The process includes the steps that according to an energy gradient utilization principle, the heating medium water drives ammonia absorption refrigeration at first and then sequentially drives lithium bromide absorption refrigeration. Chilled water made through the lithium bromide absorption refrigeration system is used for cooling the generator (an ammonia-water solution rectifying overhead condenser) and the absorber of the ammonia absorption refrigeration system in a series level mode, and therefore the ammonia absorption refrigeration process is intensified.

Description

technical field [0001] The invention provides a method widely used in petrochemical and coking production. The waste heat recovery of heat medium water is used in the refrigeration process. It relates to an integrated device of ammonia absorption refrigeration and lithium bromide absorption refrigeration. Medium-low temperature refrigerant. Specifically, the lithium bromide absorption refrigeration system is used as an auxiliary to strengthen the ammonia absorption refrigeration process, thereby reducing the temperature of the ammonia absorption refrigeration heat source, reducing the overall refrigeration cost, and realizing the recovery of low-temperature heat medium water waste heat. Background technique [0002] On the one hand, there are a large number of low-temperature heat sinks with a temperature range of -30 to 19°C in petrochemical ketone-benzene dewaxing and coking clean gas final cooling and other joint production units, and ammonia or lithium bromide refrigerat...

AI Technical Summary

Problems solved by technology

This technology combines the rich waste heat environment of the power plant, uses the waste heat to drive the refrigerator to extract cooling capacity, and uses low temperature to reduce CO 2 The liquefaction pressure, CO 2 After liquefaction, measures such as boosting the pressure of the pump are used to reduce the total CO 2 Compress power consumption, save electric energy, and improve the thermal efficiency of the whole plant, but the cooling process is more complicated and the cooling cost is higher

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