Sleeve-adding insulating device for low-temperature liquid

Abstract

The invention relates to a sleeve-adding insulating device for a low-temperature liquid. The sleeve-adding insulating device for the low-temperature liquid is primarily formed by welding upper and lower semi-insulating barrels through a connecting flange turnup between the barrels, wherein pipeline supporting racks for supporting and fixing a low-temperature liquid pipeline are arranged in the insulating barrels, sand filling holes are formed in the tops of the insulating barrels and sand discharge holes are formed in the bottoms of the barrels, and heat-isolating insulating materials fill theinsulating barrels; each of the insulating barrels is formed by welding a plurality of barrels through flange turnups on the connecting end side; the low-temperature liquid pipelines are fixed the pipeline supporting racks which are horizontally mounted between the barrels through stirrups, and 2-3 pipeline supporting racks are arranged each barrel. The sleeve-adding insulating device for the low-temperature liquid has the characteristics of being simple in structure, safe and reliable, reasonable and efficient and convenient for field mounting, maintenance and repair in later period, capableof preventing cold loss of low-temperature liquids in the pipelines, increasing the operating reliability of the device, reducing the energy consumption of an air separation device or an LNG device effectively and the like.

Description

technical field [0001] The invention relates to a low-temperature liquid heat preservation device with casing, which is suitable for the low-temperature liquid heat preservation type outside the cold box of chemical equipment, LNG plant, air separation equipment and liquefaction plant, and belongs to the technical field of low-temperature liquid heat preservation. Background technique [0002] In the air separation unit, the outlet temperature of the cryogenic liquid product is extremely low, and the general operating temperature can reach below -196°C. During operation, the low-temperature liquid pipeline outside the cold box is very easy to run cold and frost, resulting in loss of energy consumption. Especially in recent years, the internal compression process of air separation unit products will produce a large amount of cryogenic liquid products, which are generally transported to storage tanks or tankers through foam insulation pipes or vacuum pipes. These two transpor...

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Problems solved by technology

These two transportation methods have their own disadvantages in practice: the insulation size required by the foam insulation pipe is too large, which is not convenient for the overall layout, the outer layer is easy to damage and fail, and the later maintenance cost is high; the purchase cost of the vacuum tube is high, and the tube The vacuum degree of the wall will gradually decrease with time, and it is easy to run cold and hang frost, and there is a dead zone at the connection of each pipeline, so there is a risk of hydrocarbon accumulation in the liquid oxygen pipeline

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