A system and method for multi-stage utilization of air compressor waste heat

An air compressor, first-class technology, applied in heat pumps, refrigerators, mechanical equipment, etc., can solve the problems of not considering air temperature, waste heat cannot be effectively utilized, and system heat loss is large, so as to avoid heat loss and improve waste heat. Utilize efficiency and reduce the effect of intermediate heat exchange equipment

Active Publication Date: 2021-07-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mainly reflected in the fact that the existing air compressor waste heat utilization system and method have too many intermediate heat exchange equipment, which causes a large heat loss in the system; and it does not take into account that the air temperature after the first-stage compression of the air compressor in actual operation is low, and the waste heat cannot be recovered. Issues such as effective use

Method used

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  • A system and method for multi-stage utilization of air compressor waste heat

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The waste heat recovery method of the air compressor waste heat multi-stage utilization system, specifically:

[0032] Summer cooling mode:

[0033] In the summer cooling operation mode, the switch valves 14, 15, 18, 22, 23, 24, 25, 26 are in the open state, and the switch valves 16, 17, 19, 20, 21 are in the closed state. The switch regulating valve 27 is in an open state.

[0034] 150,000 Nm 3 / h The air at normal temperature and pressure reaches 95°C after being compressed by the first stage of the air compressor, and enters the first stage heat exchanger 4 to exchange heat with the cooling water at 35°C. After the heat exchange, the compressed air temperature is 40°C and enters the air compressor Two-stage compression, three-stage compression of the air compressor, the temperature of the second-stage compressed air and the third-stage compressed air can reach 120°C, after compression, it enters the second-stage heat exchanger 5 and the third-stage heat exchanger 6...

Embodiment 2

[0038] The waste heat recovery method of the air compressor waste heat multi-stage utilization system, specifically:

[0039] Winter heating mode:

[0040] In the winter heating operation mode, the on-off valves 16, 20, 21, 23, 24, 25, and 26 are in the open state, the on-off valves 14, 15, 17, and 18 are in the closed state, and the on-off valves 19 and 22 are in the adjustable state. The regulating valve 27 is in an open state.

[0041] 150,000 Nm 3 / h Normal temperature and normal pressure air passes through the first stage of the air compressor, and the temperature reaches 80°C, and enters the first stage heat exchanger 4 to exchange heat with 35°C cooling water. After the heat exchange, the compressed air temperature is 40°C and enters the air compressor Two-stage compression, three-stage compression of the air compressor, the temperature of the second-stage compressed air and the third-stage compressed air can reach 105°C, after being compressed, it enters the second-s...

Embodiment 3

[0044] The waste heat recovery method of the air compressor waste heat multi-stage utilization system, specifically:

[0045] Non-cooling and non-heating mode in spring and autumn:

[0046] In the spring and autumn non-cooling and non-heating operation mode, the on-off valves 16, 17, 18, 25, and 26 are in the open state, and the on-off valves 14, 15, 19, 20, 21, 22, 23, 24 and the on-off regulating valve 27 are in the closed state state.

[0047] 150,000 Nm 3 / h Normal temperature and normal pressure air passes through the first stage of the air compressor, and the temperature reaches 85°C, and enters the first stage heat exchanger 4 to exchange heat with 35°C cooling water. After the heat exchange, the compressed air temperature is 40°C and enters the air compressor Two-stage compression, three-stage compression of the air compressor, the temperature of the second-stage compressed air and the third-stage compressed air can reach 115°C, after compression, it enters the secon...

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Abstract

The invention relates to a multi-stage utilization system for waste heat of an air compressor, comprising primary compression of an air compressor, secondary compression of an air compressor, three-stage compression of an air compressor, a primary heat exchanger, a secondary heat exchanger, a three-stage Heat exchangers, oxygen generators, refrigeration users, heating users, heat pump units, cooling towers, water supply pumps, and flow meters; the present invention proposes an air compressor through the design of the three-stage compressed air waste heat recovery scheme of the air compressor. The system and method for multi-stage utilization of waste heat of the air compressor can directly utilize the waste heat of the cooling water of the air compressor, reduce the intermediate heat exchange equipment, avoid excessive heat loss of the system, and improve the thermal efficiency of the system; and drive the heat pump through part of the return water The method of heating the outlet water of the first-stage heat exchanger by means of multi-stage effective utilization of the waste heat of the air compressor solves the problem that the gas temperature after the first-stage compression of the air compressor is too low and cannot be effectively used after waste heat recovery, and improves the system efficiency. Waste heat utilization efficiency. It has the characteristics of saving energy and reducing maintenance costs.

Description

technical field [0001] The invention relates to the technical field of energy saving in the iron and steel industry, in particular to a multi-stage utilization system and method for waste heat of an air compressor Background technique [0002] Oxygen production processes are often set up in large iron and steel enterprises. During the process, energy media such as liquid oxygen, liquid nitrogen, and liquid helium will be produced. When the production requires corresponding energy media, liquid oxygen, liquid nitrogen, and liquid helium must be heated and vaporized. , and transport the gas energy medium to users through the pipeline network. At present, most domestic oxygen production processes use water-bath vaporizers to heat low-temperature energy media. The heating heat source is generally steam. This heating method consumes a large amount of high-quality energy and increases the production cost of enterprises. At the same time, there are multiple air compressors in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B30/02F25B15/06F04B39/00C01B13/02
CPCC01B13/02F04B39/00F25B15/06F25B30/02Y02B30/62Y02P20/10Y02P20/129Y02A30/27
Inventor 徐伟倪健勇马光宇王声张天赋陈鹏刘芳高军王飞王永
Owner ANGANG STEEL CO LTD
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