Automatic backwashing device and method of circulated ammonia water waste-heat utilization refrigerating unit

Abstract

The invention discloses an automatic backwashing device and method of a circulated ammonia water waste-heat utilization refrigerating unit and relates to the technical field of automatic backwashing of refrigerating units. The automatic backwashing device is composed of a valve V1, a valve V2, a valve V3, a valve V4, a valve V5, a differential pressure gauge, a waste discharging tank and a pipeline, wherein the valve V1 has the effect of controlling ammonia water to enter the refrigerating unit, the valve V2 achieves bypass flow of the ammonia water, the valve V3 achieves normal outflow of theammonia water from the refrigerating unit, the valve V4 achieves reverse inflow of the ammonia water into the refrigerating unit, the valve V5 achieve inflow of the ammonia water obtained after backwashing and containing a large amount of tar into the waste discharging tank, the differential pressure gauge 1 achieves differential pressure monitoring of an inlet and an outlet of the refrigeratingunit, and the waste discharging tank has the effect of containing waste ammonia water produced after backwashing. The automatic backwashing device has the advantages of being capable of automaticallyachieving refrigerating unit inside cleaning after separated-out compounds such as tar after further cooling of ammonia water of the refrigerating unit and accordingly the refrigerating efficiency isreduced, and ensuring the efficiency of the circulated ammonia water waste-heat utilization refrigerating unit.

Description

Technical field [0001] The invention relates to the technical field of automatic backwashing of refrigeration units, in particular to an automatic backwashing device and method for refrigeration units using the waste heat of circulating ammonia water. Background technique [0002] Coal coking is a process in which coking coal is heated to 950-1050°C under air isolation, and then subjected to high-temperature dry distillation to produce coke, coke oven gas and coking chemical products. Among them, the temperature of the coke oven gas when it escapes from the carbonization chamber through the riser is about 700°C. At this time, the gas contains tar gas, benzene hydrocarbons, water vapor, ammonia, hydrogen sulfide, hydrogen cyanide, naphthalene and other compounds. To recover and process these compounds, a large amount of circulating ammonia water is sprayed in the bridge pipe and gas collecting pipe. When the fine mist of ammonia water is in full contact with the raw gas, the gas t...

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Problems solved by technology

[0003] However, the temperature of high-temperature circulating ammonia water will be cooled during the refrigeration process. At this time, compounds such as tar will still be precipitated, which will accumulate in the pipeline of the circulating ammonia water waste heat utilization refrigeration unit. The cooling efficiency drops, and the cooling capacity cannot meet the actual needs. Therefore, it is necessary to decontaminate the refrigeration unit according to the pipeline blockage.

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