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 purging methods, which cannot fundamentally Solve the problem of blockage of high-plate heat exchangers; at the same time, the start-up method for (high-plate) high-plate heat exchangers in the internal compression air separation process still has the possibility of being blocked by freezing under the current process conditions, so the traditional method cannot Completely solve the existing problems

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