Method and system for internal compression process space division reducing high-pressure plate type heat exchanger temperature differences

Abstract

The invention discloses a method for internal compression process space division reducing high-pressure plate type heat exchanger temperature differences. The method comprises steps of (1) subjecting surplus nitrogen to pressure-boosting of a turbocompressor and feeding the surplus nitrogen to a reverse blow tube line; and (2) dividing the nitrogen which is obtained in the step 1 into two channels, feeding one channel of the nitrogen to a high-pressure air passage of high-pressure plate type heat exchangers and feeding the other channel to an expansive air passage of the high-pressure plate type heat exchangers. The system comprises two high-pressure plate type heat exchangers, wherein a pipe section is cut off respectively in middle sections of the high-pressure air passage and the expansive air passage, a sweeping port of high-pressure air and a sweeping port of expansive air are arranged at positions of heat end inlets of the high-pressure plate type heat exchangers respectively, the two sweeping ports are connected with a sweeping pipeline, and a nitrogen turbocompressor, a gas distributor, a sweeping gas pressure gauge, a sweeping gas inlet high plate valve and a sweeping gas flow gauge are connected sequentially to form the sweeping pipeline. By the aid of the method and the system, the problem that the high-pressure plate type heat exchanger temperature differences are large is solved, and the device can operate for a long period stably.

Description

technical field [0001] The invention relates to a method and system for reducing the temperature difference of a high-pressure plate heat exchanger by air separation in an internal compression process. Background technique [0002] Internal compression process Air separation oxygen production technology is one of the most widely used large-scale coal chemical production technologies in the world today. Air separation adopts internal compression process. Liquid oxygen and liquid nitrogen are compressed by a liquid pump and then mixed with high-pressure air in a high-pressure plate heat exchanger. After heat exchange and gasification, it is sent to the rear system, so the effect of high-pressure plate heat exchange directly affects the production load and energy consumption of the entire system. The air separation high-pressure plate heat exchanger often has a high temperature difference during operation, resulting in high energy consumption of the device. It is imperative to ...

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Problems solved by technology

[0003] The traditional method to solve the foreign matter in the high pressure plate heat exchanger is to heat and purge the whole system ( figure 1 shown), but the high-pressure air channel and the expansion air channel of the high-pressure plate heat exchanger are not provided with special purge ports, and the foreign matter in the heat exchanger cannot be completely removed by ordinary heating and

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