Process for producing clean synthesis gas from crushed coal

Abstract

The invention discloses a process for producing clean synthesis gas from crushed coal. The process comprises the steps of producing crude coal gas by virtue of a crushed coal pressurizing gasifying furnace, after carrying out heat exchange, supplying the crude coal gas together with preheated oxygen into a high-temperature pyrolysis reforming reactor to enable original water vapor and carbon dioxide in the added oxygen and crude coal gas to serve as oxygen-containing reaction media to react with organic matters such as various oil, low carbon hydrocarbon and CH4 in the crude coal gas, reforming the mixed gas into CO and H2, and converting most of ammonia gas in the crude coal gas into nitrogen by virtue of a high temperature action, wherein the temperature in the reactor can reach 900-1400 DEG C, and the outlet temperature of crude synthesis gas is 900-1200 DEG C. The crude synthesis gas does not contain tar, low carbon hydrocarbon and phenolic compounds, the content of NH3-N and the CODCr of condensed water are substantially decreased, and the yields of CO and H2 of low-rank coal are substantially increased.

Description

technical field [0001] The invention relates to a process for producing clean synthesis gas from crushed coal, in particular to a process for producing clean synthesis gas based on a crushed coal pressurized gasifier. Background technique [0002] Coal gasification is one of the core technologies to realize efficient and clean utilization of coal. The development goal of coal gasification is to use solid fuels including low-quality coal to generate large-scale, continuous, efficient and clean coal gas. Coal gasification can produce industrial fuel gas, civil fuel gas, chemical synthesis raw material gas, synthetic fuel oil raw material gas, hydrogen fuel cell, coal gas combined cycle power generation, synthetic natural gas, rocket materials, etc. [0003] At present, gasifiers mainly include fixed bed, fluidized bed, entrained bed and other gasifiers. The composition of crude gas produced by different gasifiers is different, especially the yield and composition of liquid oi...

AI Technical Summary

Problems solved by technology

It is a big advantage for the production of natural gas, the gas load of the methanation unit is greatly reduced, so the investment is low and the consumption is low; but for the production of synthetic gas, it is necessary to convert this part of methane into CO and H2, you need to increase the methane conversion unit, and the investment and consumption will increase, which is a big disadvantage

In addition, the main disadvantage of pressurized gasification of pulverized coal is: due to the countercurrent gasification bed, the composition of the generated gas is relatively complex, except for CO, H2, CH4, In addition to CO2 and H2O and other main components, there are light oil, naphtha, tar, phenol, fatty acid and CnHm, NH3, H2S, etc., which add difficulty and investment to the purification and separation of subsequent processes

[0014]The above-mentioned technological process is cumbersome, which greatly increases the equipment investment cost and operating cost of the enterprise

To put it more clearly, these traditional treatment processes are still the old idea of ​​pollution first and then treatment. Only by changing this situation from the source can the treatment become simple, easy and efficient

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