System and method for recycling waste heat in oxygen making process
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A waste heat recovery and process technology, which is applied in the field of waste heat recovery and utilization system of oxygen production process, can solve the problems of not considering air temperature, unable to make full use of waste heat resources, unable to make effective use, etc., so as to improve waste heat utilization efficiency, reduce maintenance costs, Energy saving effect
Active Publication Date: 2019-12-13
ANGANG STEEL CO LTD
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Problems solved by technology
It is mainly reflected in the fact that the existing air compressor waste heat utilization system and method in the oxygen production process do not take into account the low temperature of the air after the first-stage compression of the air compressor in actual operation, and the waste heat cannot be effectively used after recovery; at the same time, how effective is the waste heat recovery of the air compressor? To adapt to fluctuations in thermal user demand, there is no solution
Moreover, the waste heat resources in the oxygen production process are mainly used for domestic heating after recovery, and domestic heating is usually limited by the heat supply and heating radius, and the large amount of waste heat resources in the oxygen production process cannot be fully utilized.
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[0040] In the non-operating mode of the low-temperature heat exchanger, the switch valves 16, 17, 29 are in the open state, the switch valves 18, 19, 21, 26, 27, 28 are in the closed state; the switch control valves 22, 31 are in the open state, and the switch Regulating valves 20, 23, 24, 25, 30 are in closed state. The design maximum water storage capacity of the high temperature storage tank 9 is 1800m 3 .
[0041] 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 compressi...
Embodiment 2
[0045] Low temperature heat exchanger operating mode:
[0046] In the operation mode of the low temperature heat exchanger, the switch valves 16, 18, 19, 21, 26, 27, 28, 29 are in the open state, and the switch valve 17 is in the closed state; all the switch control valves 20, 22, 23, 24, 25 , 30, 31 are on. The maximum water storage capacity of the high temperature storage tank 13 is 1800m 3 .
[0047] 150,000 Nm3 / h air at normal temperature and pressure passes through the first stage of the air compressor, and the temperature reaches 95°C, 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 The two-stage compression of the air compressor and the 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, and after compression, it enters the second-stage heat exchange...
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Abstract
The invention relates to the technical field of energy conservation in the steel industry, in particular to a system and method for recycling waste heat in an oxygen making process. The device comprises an air compressor primary compression part, an air compressor secondary compression part, an air compressor tertiary compression part, a primary heat exchanger, a secondary heat exchanger, a tertiary heat exchanger, an oxygen generator, a refrigeration user, a heat supply user, a 1# heat pump unit, a 2# heat pump unit, a cooling tower, a water supply pool, a high-temperature water storage tank,a low-temperature liquid heat exchanger, a flowmeter and various valves connected between the devices. The method for recycling waste heat in the oxygen making process comprises two operation models,namely, a low-temperature heat exchanger non-operation mode and a low-temperature heat exchanger operation mode. According to the system and method for recycling waste heat in the oxygen making process, the waste heat of the cooling water of an air compressor is directly and efficiently utilized, the problem of large unplanned, intermittent and instantaneous heating amount existing in low-temperature liquid oxygen heating is solved, and the effective utilization of the waste heat in the oxygen making process in production and life is realized. The waste heat utilization efficiency of the system is improved, and the system has the characteristics of saving energy, reducing maintenance cost and the like.
Description
technical field [0001] The invention relates to the technical field of energy saving in the iron and steel industry, in particular to a system and method for recovering and utilizing waste heat in an oxygen production process. Background technique [0002] Iron and steel enterprises need a large amount of high-purity oxygen, nitrogen and other energy media in the process of smelting and production. Therefore, large iron and steel enterprises usually have their own oxygen production process, with multiple oxygen generators and oxygen pipeline networks. The oxygen produced by the oxygen generator passes through the pipe The network is sent to each oxygen-consuming user; when a certain oxygen generator has a tripping failure in the oxygen production process, and the amount of oxygen produced cannot meet the needs of downstream oxygen-consuming users, it will cause insufficient pressure in the oxygen pipe network and the tripping of the oxygen generator Generally, it takes up to...
Claims
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Application Information
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