Combined purifying technique for ammonia preparation from natural gas, ammonia preparation from coal and methanol preparation from coal

Abstract

The combined purification process of ammonia preparation with natural gas and coal as well as methanol preparation with coal belongs to the purification technical field of synthesis gas of ammonia preparation with natural gas and coal as well as methanol preparation with coal. In the low-temperature methanol purification system of the process gas of methanol preparation with coal and ammonia withcoal, the coal gas is fed into the bottom of the coal prepared methanol and coal prepared ammonia process gas scrubber; meanwhile, fresh methanol solution with the temperature of about 64 DEG C belowzero is used to wash only the coal prepared methanol process gas; the semi lean solution is taken out of the coal prepared ammonia process gas scrubber to wash the coal prepared ammonia process gas; the H2+CO2 mixed gas used for synthesising ammonia is taken out from the coal prepared ammonia process gas scrubber and fed in the CO2 purification device of the prior natural gas prepared ammonia process purification system; the follow-up process of the prior natural gas prepared ammonia is used to prepare ammonia. The invention has the advantages of the optimization and the combination of three independent processes, namely ammonia preparation with natural gas, ammonia preparation with coal and methanol preparation with coal, system simplification, energy consumption saving, and reduction ofequipment quantity and investment.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas purification from natural gas and coal gas, in particular to the technical field of synthesis gas purification for ammonia production from natural gas, ammonia from coal and methanol from coal. Background technique [0002] The existing natural gas ammonia production and coal gas ammonia production are two completely independent processes, using two sets of equipment respectively, and coal gas production has the technical ability to simultaneously provide raw material gas to methanol production equipment and synthetic ammonia production equipment. However, the intermediate substances used for ammonia production after desulfurization and purification of natural gas ammonia and coal gas are basically the same, which makes the two sets of ammonia production processes and equipment flow duplication after desulfurization and purification, large investment and relatively large energy consumption. ...

AI Technical Summary

Problems solved by technology

[0005] 2. The energy consumption of raw process gas purification of coal-to-ammonia is relatively large:

[0009] 4. The low-temperature methanol purification process of coal-to-ammonia raw process gas is difficult to operate and requires high control:

[0010] In the coal-to-ammonia process, since the outlet of the coal-to-ammonia raw process gas scrubber must be strictly controlled to a very low CO 2 content, thus greatly increasing the difficulty of the design and operation control of the coal-to-ammonia gas purification process, so as to meet the CO 2 strict requirements

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