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Air separation system

A technology of air separation system and air separation equipment, which is applied in the field of air separation system, can solve the problems of energy consumption without product output, long start-up time of air separation equipment, large energy consumption, etc., so as to shorten start-up time, save energy consumption, The effect of reducing energy consumption

Inactive Publication Date: 2020-03-06
NEW FOUNDER HLDG DEV LLC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the cooling capacity during the start-up process of the air separation plant generally comes from the turbo expander of the air separation plant itself, but the turbo expander itself matches the supplementary cold loss during normal operation, so the cooling capacity is limited , resulting in a long start-up time of the air separation plant
During the start-up process of the air separation plant, the main high-power equipment such as the raw material air compressor continues to operate, but because the main condensing evaporator is not working at this stage, a large amount of processed air is released, and only a small amount enters the turbo expander for further processing. Refrigeration, so the energy consumption in the start-up phase is very large, and only energy consumption has no product output

Method used

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Effect test

Embodiment 1

[0081] Such as figure 1 and figure 2 As shown, the air separation plant 1 is an air separation plant 1 with full low pressure and external compression process, and the output is nitrogen, oxygen and dirty nitrogen. The liquefaction unit 2 is a nitrogen single expansion liquefaction unit 2 with a refrigerator 230. The output of the liquefaction unit 2 is The reflux gas is connected to the nitrogen reflux pipe 71 at the top of the upper tower 63.

[0082] Among them, such as figure 1 As shown, the air separation plant 1 comprises a raw material processing unit, a refrigeration unit, a heat exchange unit 40, a rectification tower, a reflux pipeline and a medium output pipeline, and the principle treatment unit comprises a raw material air compressor 10 and a molecular sieve adsorber 20, and the refrigeration unit comprises Two turboexpanders 30, the heat exchange device 40 includes a main heat exchanger, a subcooler 50 is also connected between the return flow pipeline and the...

Embodiment 2

[0104] Embodiment 2 (not shown in the figure)

[0105] The difference with Embodiment 1 is that the liquefaction unit 2 is an oxygen single expansion liquefaction unit 2, promptly utilizes the liquefaction unit 2 of oxygen to assist the air separation plant 1 to start, and the return flow gas of the second pipeline 4 is connected to the oxygen return flow pipe 72 ( Certainly also can be connected to nitrogen return pipe 71 or dirty nitrogen return pipe 73). Correspondingly, the medium input pipeline 270 of the liquefaction unit 2 is an oxygen input pipeline, the circulation compressor 210 is a circulation oxygen compressor, and the liquid storage device 250 is a liquid oxygen storage tank, which also shortens the start-up time of the air separation plant 1, and its The basic principle is the same as that of the first embodiment, and will not be repeated here.

Embodiment 3

[0106] Embodiment three (not shown in the figure)

[0107] The difference with Embodiment 1 is that the liquefaction unit 2 is a high-low pressure dual-stage expansion liquefaction unit 2 for nitrogen, and the return gas of the second pipeline 4 is connected to the nitrogen return pipe 71 of the upper tower 63, but the auxiliary air separation plant 1 starts At this time, only the low-pressure stage booster expander 220 is turned on to ensure that the gas pressure input into the air separation plant 1 matches the air separation plant 1, and also achieves the effect of shortening the start-up time of the air separation plant 1, and the basic principle is the same , which will not be repeated here.

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Abstract

The invention provides an air separation system. The air separation system comprises air separation equipment and a liquefying device. The air separation equipment comprises a raw material treatment device, a heat exchange device and a backflow pipeline; the output end of the backflow pipeline and the cold medium input end of the heat exchange device are connected with a first pipeline and a second pipeline; one end of the first pipeline communicates with the output end of the raw material treatment device, and a first control unit is arranged on the first pipeline 3; and one end of the secondpipeline communicates with the backflow pipeline, and a second control unit is arranged on the second pipeline. The liquefying device comprises a cooling device; the input end and the output end of the cooling device communicate with the other end of the first pipeline and the other end of the second pipeline correspondingly; and when the air separation equipment is started, the first control unit controls the first pipeline to be connected, and the second control unit controls the second pipeline to be connected. The cooling device of the liquefying device is used for assisting the air separation equipment to be started, accordingly, the starting time of the air separation equipment can be shortened greatly, energy consumption of industries of the metallurgical industry and the like is reduced significantly, and the energy-saving purpose is achieved.

Description

technical field [0001] The invention relates to the technical field of air separation, in particular to an air separation system. Background technique [0002] Air separation equipment is a major energy consumer in industries such as metallurgy. Before normal production, the air separation equipment needs to complete the start-up process. The start-up process of air separation equipment includes three stages of cooling equipment, accumulating liquid and adjusting purity. In the three stages, cooling equipment and accumulating liquid require a lot of cooling capacity to complete, especially the current process of argon production by full rectification with structured packing. The cold storage capacity required is larger. [0003] In the prior art, the cooling capacity during the start-up process of the air separation plant generally comes from the turbo expander of the air separation plant itself, but the turbo expander itself matches the supplementary cold loss during norma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J3/04018F25J3/04793F25J3/04224F25J3/04303F25J3/04357F25J3/04393F25J3/04412F25J3/04818F25J3/04957F25J2230/24F25J2230/40F25J2240/04F25J2245/40
Inventor 钱立新
Owner NEW FOUNDER HLDG DEV LLC