Modification of each stage of compressed condensate separator

In pure hydrogen and ideal conditions, the outlet temperature of adiabatic compression of hydrogen is relatively low, and the equipment can run smoothly. This temperature rise is unavoidable for a particular compressor and gas. The temperature rise is constant at a certain compression ratio and outlet pressure. The compressor discharge temperature is only related to the base temperature, the inlet temperature. The temperature rise in practical applications is much higher than the above theoretical calculations. According to further analysis, because the reaction and separation system require low pressure and short residence time of the separated material, the condensation of methyl ethyl ketone and sec-butanol in the hydrogen from the gaseous state to the liquid is incomplete, and the hydrogen at the inlet of the compressor contains supersaturated methyl ethyl ketone. Secondary butanol. The Department of Chemical Engineering of the Institute of Chemical Engineering of the Island once worked in the chemical engineering design of Qilu Petrochemical Design Institute. Now, Zibo Qixiang Industry and Trade Co., Ltd. is engaged in the power equipment industry. The partially saturated methyl ethyl ketone and sec-butanol will be in the compressor body. The internal pressure rises, the volume is reduced, and the wall contact liquefies, releasing the heat of condensation, which causes the exhaust gas temperature to be too high. From the actual operation of the device, the hydrogen purification system after the compressor can separate about 600 kg of liquid methyl ethyl ketone and sec-butanol per day, and about 500 kg of the material is condensed into a liquid in the compressor body. Before and after compression, 80e is used as the qualitative temperature to check the relevant data: sec-butanol vaporization; A, the liquid sec-butanol, methyl ethyl ketone are calculated according to 50%, liquefaction exotherm can make hydrogen and liquid methyl ethyl ketone, sec-butanol warm up 11.7e, and The compression temperature of the compressor itself is cumulative, and the outlet temperature can reach 123.7e, which is consistent with the actual operation of 125e.

Treatment method From the above analysis, it can be seen that the adiabatic temperature rise of the compressor is unavoidable from the thermodynamic point of view, but the base temperature can be lowered to lower the outlet temperature. The moisture in the hydrogen condenses in the compressor body and the exotherm causes the gas temperature to rise and can be removed prior to compression. Therefore, the transformation was carried out from two aspects. (1) Lower the base temperature. Enhance the cooling effect and reduce the inlet temperature of each stage of the compressor. The primary and secondary outlet heat exchangers are modified to improve the heat exchange efficiency, while reducing the temperature of the heat exchange circulating water, so that the hydrogen inlet temperature of the second and third stage compression is reduced by 4e. (2) reducing the amount of liquid condensation in the compressor body . The hydrogen pretreatment system is added to remove the wet gas before the hydrogen enters the compressor, so that the volume fraction of methyl ethyl ketone and sec-butanol in the hydrogen at the inlet of the compressor is reduced from 1.0% to 0.16%. The separator is modified to discharge methyl ethyl ketone and sec-butanol which are condensed into liquid in time to reduce the process of repeated gasification condensation and improve the efficiency of compressor work.

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