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The conversion section process adopts sulfur-tolerant conversion process, which can make full use of the saturated water vapor in the crude syngas produced in the gasification section, reduce the demand for medium-pressure steam in the conversion process, and reduce the energy consumption of the device. At the same time, the Co-Mo catalyst has a catalytic effect on the conversion of organic sulfur into hydrogen sulfide, which can reduce the organic sulfur content in the decarbonized gas and improve the purification of the synthesis gas. Partial transformation is used to make the transformation gas ratio in the outbound zone meet the H2/CO ratio required by the methanol synthesis unit. The gasified water gas first passes through the gas-liquid separator to separate the entrained moisture, and then passes through the gas filter to remove trace ash and other transformed toxic substances, and then is divided into two streams. Most of the gas is heated by the preheater and then enters the conversion furnace for CO conversion. After preliminary heat recovery, it merges with another stream of water gas. In order to fully recover the conversion waste heat and reduce energy consumption, the conversion reaction heat is used not only to preheat the crude gas entering the conversion furnace, but also to produce 2.5MPa and 0.5MPa saturated steam by-product, and the rest is used to preheat desalted water. The high-temperature conversion condensate is sent back to gasification for utilization, the low-temperature condensate is sent to gas extraction, and the ammonia content of the gasification condensate is less than 100ppm. The converted gas is washed with cooled boiler feed water to remove trace amounts of NH3, HCN and other impurities (