Cold vacuum system

Abstract

The invention provides a cold vacuum system which comprises a liquid ammonia gas-liquid separation tank, a screw compressor, an ammonia condenser, a liquid ammonia storage tank, a first cold condenser, a second cold condenser, a first steam jet vacuum pump, a second steam jet vacuum pump, a cooling water condenser, a liquid ring pump, a hot well and a deicing tank, wherein the liquid ammonia gas-liquid separation tank, screw compressor, ammonia condenser and liquid ammonia storage tank are connected sequentially; the first cold condenser and the second cold condenser are respectively connected with the liquid ammonia gas-liquid separation tank; the first steam jet vacuum pump, second steam jet vacuum pump, cooling water condenser and hot well are connected sequentially; the first steam jet vacuum pump is respectively connected with the first cold condenser and the second cold condenser; the liquid ring pump is connected with the cooling water condenser; and the deicing tank is respectively connected with the first cold condenser, second cold condenser and hot well. The invention can lower the steam consumption, reduce the discharge of carbon dioxide and sewage and effectively control the volatilization of irritative gas.

Description

technical field [0001] The invention relates to the field of edible oil processing, in particular to an ice-cooled vacuum system suitable for the refining and deodorizing section of edible oil. Background technique [0002] During the processing of edible oils and fats, due to the oxidation of air and metal ions such as iron and copper accompanied by a small amount of water in the oils, the oils will be corrupted, resulting in the production of fatty acids, hydroxy acids and other substances. At the same time, it may also cause protein deterioration, resulting in stink. Therefore, for the processing of edible oils and fats, a key step is deodorization. [0003] The so-called deodorization is the process of using the difference in volatility of odorous substances and triglycerides in oil to remove odorous substances by means of steam distillation under high temperature and high vacuum conditions. The odorous substances in oil mainly include low molecular weight aldehydes, k...

AI Technical Summary

Problems solved by technology

[0006] 1. High steam consumption: the deodorized gas and direct steam are pumped out through the two-stage jet pump, and the steam ejector consumes a lot of steam;

[0007] 2 Large amount of sewage: the gas of the steam ejector and the deodorized gas are condensed in the hot well together, and the flow of sewage is relatively large;

[0008] 3. Strong smell: because the light component irritating gas carried in the deodorized gas volatilizes in the open hot well, the surrounding smell is strong and the air pollution is serious

However, this invention patent requires multiple heat exchange plates. Due to the poor pressure resistance of the heat exchange plates, the operation of the system is relatively difficult. Once the temperature is not well controlled and the pressure fluctuates, the heat exchange plates will be damaged. If Replacing the heat exchange plate will further increase the cost of the entire vacuum system

[0010] In addition, the invention patent of Chinese patent application number 201120270189.8 discloses a chilled water vacuum system. Although the chilled water vacuum system provided by this patent solves the problem of odor, relatively speaking, the steam and power consumption of the system are still relatively high.

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