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Pressure control method and device

A pressure control and pressure technology, applied in the field of pressure control methods and devices, can solve problems such as affecting the quality of nitrogen products, pressure fluctuations in the upper tower of an air separation plant, and reducing nitrogen purity.

Active Publication Date: 2019-12-24
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a pressure control method and device, which is used to solve the pressure fluctuation of the upper tower of the air separation unit due to the smaller diameter of the sewage nitrogen pipeline in the prior art, causing Reduced nitrogen purity, technical issues affecting the quality of nitrogen products

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Embodiment 1

[0041] This embodiment provides a pressure control method, which is applied in the air separation system. In order to better understand the technical solution in this paper, the overall structure of the air separation system will be introduced first. see figure 1 , the air separation system includes: cold box 1, air filter room 2, air compressor 3, air cooling tower 4, nitrogen water tower 5, refrigerator 6, water pump 7, supercharger 8, expander 9, liquid oxygen pump 10, heating Device 11, molecular sieve.

[0042] see figure 2 , an air separation tower 20 and a plate heat exchanger 22 are installed in the cold box 1. The air separation tower 20 includes an upper tower 21 and a lower tower, and the pure nitrogen pipeline and the dirty nitrogen pipeline are separated from the upper tower 21, and the pure nitrogen pipeline comes out It is finished nitrogen, which is used to provide nitrogen for enterprises. The pure nitrogen pipeline includes: the first pure nitrogen pipeli...

Embodiment 2

[0077] This embodiment provides a pressure control device, which is applied in the air separation system mentioned in Embodiment 1, such as Figure 4 As shown, the device includes: a first control unit 41, a second control unit 42, a third control unit 43, a fourth control unit 44, a fifth control unit 45, a sixth control unit 46, and a seventh control unit 47; wherein,

[0078]In order to ensure the nitrogen consumption of the downstream production line, regardless of whether the molecular sieve is in the heating stage or the cold blowing stage, the first control unit 41 controls the opening of the first valve on the first pure nitrogen pipeline to be 30-35%, and the second control unit 42 Control the opening of the second valve on the second pure nitrogen pipeline to 30-35%; the pure nitrogen output from the first pure nitrogen pipeline and the second pure nitrogen pipeline enters the nitrogen compressor unit, and is pressurized for use in downstream production lines. Wherei...

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Abstract

The invention provides a pressure control method and device applied to an air separation system. The air separation system comprises a first pure nitrogen pipeline, a second pure nitrogen pipeline, athird pure nitrogen pipeline, a first dirty nitrogen pipeline, a second dirty nitrogen pipeline, a third dirty nitrogen pipeline and a fourth dirty nitrogen pipeline; the third pure nitrogen pipelineand the first dirty nitrogen pipeline are connected with a nitrogen water tower; and the second dirty nitrogen pipeline and the third dirty nitrogen pipeline are connected with a molecular sieve. Themethod comprises the following steps: the openness of a first valve on the first pure nitrogen pipeline is controlled within 30-35%, and the openness of a second valve on the second pure nitrogen pipeline is controlled within 30-35%; when the molecular sieve is determined in a heating phase or a cold blowing phase, the first openness of a third valve on the third pure nitrogen pipeline is controlled based on a preset upper tower pressure, and the preset upper tower pressure is 36 KPa; a fourth valve on the first dirty nitrogen pipeline is controlled to close; and a sixth valve on the fourth dirty nitrogen pipeline is controlled to close.

Description

technical field [0001] The invention relates to the technical field of air separation rectification, in particular to a pressure control method and device. Background technique [0002] The stability of the upper tower pressure in the air separation unit is a necessary condition for the stability of the rectification working condition. The fluctuation of the upper tower pressure will make the working condition of the whole rectifying tower fluctuate, affect the purity of the product nitrogen, and also cause the change of the argon enrichment area and thus affect the argon concentration. Extraction of fractions. [0003] With the development of iron and steel enterprises, the demand for pure nitrogen in the production of iron and steel enterprises has increased by multiples. When the pure nitrogen output of the existing air separation unit can no longer meet the production demand, through the technological transformation of the existing air separation unit , increasing the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/04
CPCF25J3/04181F25J3/04563F25J3/04781F25J3/04787F25J2215/42F25J3/0409F25J3/04157F25J3/04412F25J3/04775F25J2205/32F25J2205/34F25J2245/42F25J2270/90
Inventor 刘硕沈安武马令军张悦田孟马永进唐和林李双全
Owner BEIJING SHOUGANG CO LTD
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