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Hot start method for boost expander

An expander, hot start technology, applied in lighting and heating equipment, liquefaction, solidification and other directions, can solve the problems of high power consumption and cooling efficiency discount, and achieve the effect of reducing start-up power consumption

Active Publication Date: 2013-11-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] When the above-mentioned air separation equipment is hot started, because the temperature of the middle part of the main heat exchanger and the outlet of the cold end is gradually reduced, the air temperature at the inlet and expansion end is higher than the normal working condition for a long time at the initial stage of start-up, and the booster end is at the same time for a long time. In the bypass operation state, the cooling efficiency is greatly reduced. Generally, the hot start process takes about 48 hours, and the power consumption is huge.

Method used

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  • Hot start method for boost expander

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Embodiment Construction

[0016] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0017] See figure 1 , is a process flow diagram of an embodiment of a method for thermally starting a booster expander in the present invention. In the initial stage of thermally starting the expander, in the present invention, all the gas at the outlet of the expansion end is bypassed with the dirty nitrogen channel of the main heat exchanger to speed up the main heat exchanger. At the same time, the air at the outlet of the cold end of the main heat exchanger is first introduced into the expansion end, and after the temperature of the outlet air at the expansion end drops to the design value, the air in the middle of the main heat exchanger is gradually introduced into the expansion end. Make full use of the maximum cooling capacity to shorten the hot start-up time of the air separation unit, and make the expander always operate at the highest d...

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Abstract

The invention relates to the field of refrigeration process of boost expanders, in particular to a hot start method for a boost expander, wherein the method is characterized in that in a hot start initial stage, all gases exhausted from an expansion end enter a waste nitrogen channel of a main heat exchanger to bypass and quicken decrease of temperature of the main heat exchanger, simultaneously, air exhausted from a cold end of the main heat exchanger flows into the expansion end at the first, then air in the middle of the main heat exchanger gradually flows into the expansion end after the temperature of the air exhausted from the expansion end is reduced to a designed value to enable the expander to run at the highest secure rotation speed all the time, and to fully develop maximum refrigerating capacity to shorten space division hot start time. Compared with the prior art, beneficial effects of the method are as follows: after the method is utilized, hot start time of the expander is shortened from former 48 h to 42 h, a bypass operation period is crossed fast in relatively shorter time, and refrigerating capacity of the expander is fully developed to further reduce power consumption for start.

Description

technical field [0001] The invention relates to the refrigeration process field of a booster expander, in particular to a method for thermally starting a booster expander. Background technique [0002] At present, in the refrigeration process using a booster expander, the compressed air is purified by molecular sieves, and one way enters the lower tower through the channel A of the main heat exchanger; Channel B of the main heat exchanger enters the expansion end from the middle part and the cold end of the main heat exchanger to cool down, and then enters the upper tower. [0003] When the above-mentioned air separation equipment is hot started, because the temperature of the middle part of the main heat exchanger and the outlet of the cold end is gradually reduced, the air temperature at the inlet and expansion end is higher than the normal working condition for a long time at the initial stage of start-up, and the booster end is at the same time for a long time. In the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J2245/40F25J3/04303F25J3/04818F25J3/04781
Inventor 魏春光姜晓东田作为罗跃辉
Owner ANGANG STEEL CO LTD
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