Liquid air separation device and production method utilizing night cheap electric power

A technology of air separation plant and electric power, which is applied in the directions of liquefaction, cold treatment separation, refrigeration and liquefaction, etc., can solve the problem of high production cost of air separation plant, and achieve the effect of avoiding adverse effects, system stability and good cooling effect.

Pending Publication Date: 2019-08-23
兰文旭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of liquid air separation plant and production method that utilizes cheap electric power at night in order to solve the problem of high production cost of the existing air separation plant

Method used

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  • Liquid air separation device and production method utilizing night cheap electric power
  • Liquid air separation device and production method utilizing night cheap electric power
  • Liquid air separation device and production method utilizing night cheap electric power

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Experimental program
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Embodiment 1

[0032] See attached Figure 1~2 . A liquid air separation plant utilizing cheap electricity at night, comprising a constant operation air separation system I, variable load or intermittent operation liquefaction system II and a cryogenic liquid storage system III; the constant operation air separation system I includes a lower tower 1, an upper tower 2. Main condensing evaporator 21, liquid nitrogen separator 28, throttle valve one 16 and throttle valve three 17; the lower tower 1 at least includes a nitrogen outlet 11, a first reflux liquid inlet 12, and a cryogenic liquid from top to bottom. Inlet 13, compressed cooling and purified air inlet 14 and oxygen-enriched liquid air outlet 15; the main condensation evaporator 21 is located at the bottom of the upper tower 2, including a nitrogen inlet 22 and a liquid nitrogen outlet 23; the upper tower 2 is from top to bottom At least including dirty nitrogen outlet 24, liquid nitrogen inlet 25, oxygen-enriched liquid air inlet 26...

Embodiment 2

[0040] See attached figure 1 , 3 . A liquid air separation plant utilizing cheap electricity at night, comprising a constant operation air separation system I, variable load or intermittent operation liquefaction system II and a cryogenic liquid storage system III; the constant operation air separation system I includes a lower tower 1, an upper tower 2. Main condensing evaporator 21, liquid nitrogen separator 28, throttle valve one 16 and throttle valve three 17; the lower tower 1 at least includes a nitrogen outlet 11, a first reflux liquid inlet 12, and a cryogenic liquid from top to bottom. Inlet 13, compressed cooling and purified air inlet 14 and oxygen-enriched liquid air outlet 15; the main condensation evaporator 21 is located at the bottom of the upper tower 2, including a nitrogen inlet 22 and a liquid nitrogen outlet 23; the upper tower 2 is from top to bottom At least including dirty nitrogen outlet 24, liquid nitrogen inlet 25, oxygen-enriched liquid air inlet ...

Embodiment 3

[0046] See attached Figure 1~3 . A liquid air separation production method using cheap electricity at night, adopting a liquid air separation device using cheap electricity at night according to claim 8, comprising a constant operation air separation step, a variable load or intermittent operation liquefaction step and low temperature liquid storage step;

[0047] The air separation steps of constant operation are: after the raw air is compressed by the raw air compressor unit 61, it enters the air precooler 62 for cooling, then enters the air purifier 63 to remove impurities that are easy to freeze and block, and then enters the main heat exchanger 64 to be cooled to Saturation temperature, then enter the lower tower 1 from the compressed cooling and purified air inlet 14; the low-temperature liquid storage system III provides low-temperature liquid to enter the middle part of the lower tower 1 from the cryogenic liquid inlet 13, as one of the reflux liquids of the lower to...

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PUM

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Abstract

The invention discloses a liquid air separation device and production method utilizing night cheap electric power, and belongs to the field of gas copious cooling liquidation. The total liquid air separation device is divided into three independent systems, a constant operation air separation system, a load variable or intermittent operation liquidation system and a low-temperature liquid storagesystem. Nitrogen is provided for the load variable or intermittent operation liquidation system and is liquefied into low-temperature liquid to be stored in the low-temperature liquid storage system.The low-temperature liquid storage system is used for providing the low-temperature liquid for a lower tower. According to the liquid air separation device and production method utilizing the night cheap electric power, waste nitrogen discharged by an upper tower is cyclically utilized, and the aim of reducing electric charged generated by the liquid air separation device through the night cheap electric power is achieved in a manner that a large quantity of liquid nitrogen is generated by full loads at the trough electric charge and the fair price time frames and load reduction or shutdown iscarried out at the peak time frame.

Description

technical field [0001] The invention belongs to the field of gas cryogenic liquefaction, and in particular relates to a liquid air separation device and a production method utilizing cheap electricity at night. Background technique [0002] The liquid products (liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen and LNG, etc.) obtained by cryogenically liquefying the gas are small in size, convenient for storage and transportation, and have a wide radiation area. At the same time, liquid hydrogen, LNG, etc. are used as automobile fuels Mileage is longer. Therefore, the liquefaction device for the production of liquid products plays a very important role in the industry, especially the full-liquid air separation of liquid oxygen, liquid nitrogen, and liquid argon for the production of major industrial gases has broad market prospects. [0003] The main production cost of an all-liquid air separation unit is electricity, and with the advancement of cryogenic liquefa...

Claims

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Application Information

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IPC IPC(8): F25J1/00F25J1/02F25J3/04
CPCF25J1/0012F25J1/0015F25J1/0257F25J1/0262F25J3/04054F25J2210/40F25J2210/42F25J2215/42F25J2215/50F25J3/04412F25J3/04496F25J3/04224F25J3/04357F25J3/04393F25J3/04278F25J2270/12F25J2270/60F25J2270/66F25J2270/906
Inventor 兰文旭
Owner 兰文旭
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