Cold storage liquid ammonia high-low position detection and control system and method

Abstract

The invention discloses a cold storage liquid ammonia high-low position detection and control system and method. The system comprises an ammonia gas-liquid separator, a wire mesh demister and a liquidometer; the ammonia gas-liquid separator is an oval shell made of a metal plate, a gas inlet pipe is arranged on the upper portion of one side of the ammonia gas-liquid separator, a gas outlet pipe is arranged in the middle of the ammonia gas-liquid separator, a liquid ammonia outlet pipe is arranged on the lower portion of the ammonia gas-liquid separator, and an oil outlet pipe is arranged in the center of the bottom of the ammonia gas-liquid separator; a liquid level meter is fixedly installed on one side of the oil outlet pipe, supporting legs are evenly distributed on the outer circle of the bottom of the ammonia gas-liquid separator, and a wire mesh demister is arranged between the gas inlet pipe and the gas outlet pipe in the ammonia gas-liquid separator.According to the invention, liquid ammonia high-low level intelligent remote control is realized, the labor is saved, the cost is reduced, and ammonia leakage accidents are avoided.

Description

technical field [0001] The invention relates to the technical field of cold storage liquid ammonia, in particular to a system and method for detecting and controlling the high and low levels of liquid ammonia in a cold storage. Background technique [0002] Cold storage is a warehouse that uses cooling facilities to create suitable humidity and temperature conditions, also known as cold storage, and is a place for processing and storing agricultural and livestock products. It can get rid of the influence of climate, prolong the storage period of agricultural and livestock products, and adjust the market supply. Cold storage is mainly used for constant temperature storage of food, dairy products, meat, aquatic products, poultry, fruits and vegetables, cold drinks, flowers, tea, medicines, and chemical raw materials. Judging from the current situation and development trend of cold storage, garlic constant-temperature liquid ammonia cold storage has developed rapidly, the prop...

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Problems solved by technology

The direct cause of the accident: When the operators in the ammonia compressor room were performing hot ammonia defrosting operations at the ammonia regulating station, the surveillance video in the production line area of ​​the single freezer showed that there were about 7 slight vibrations on the site one after another, and the duration of each vibration was about 1 to 6 seconds. No wait, the cap at the north end of the return air header of the single-freezing machine that is undergoing defrosting operation fell off, causing ammonia to leak and causing a major vicious accident

At present, the traditional liquid ammonia is not equipped with high and low level detection and control systems, let alone remote control. Once the liquid ammonia in the ammonia gas-liquid separator exceeds the outlet pipe, a large amount of liquid ammonia will directly enter the working cylinder of the compressor. At first, the compressor and pipeline will Frosting will cause the compressor to vibrate. If the power is not turned off and shut down in time, a serious ammonia leakage accident will occur. Therefore, a system and method for detecting and controlling the level of liquid ammonia in the cold storage is very important.

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