Method and system for preparing synthetic gas from volatiles in low rank coal

Abstract

A method for preparing synthetic gas from volatiles in low rank coal is characterized in that the low rank coal is processed by a gasification reduction process to obtain an oil and gas mixture, the oil and gas mixture is processed by a purifying process to obtain a mixed gas containing CO, H2 and hydrocarbons, the mixed gas is processed by a partial hydrocarbon reforming conversion process to obtain the synthetic gas containing CO and H2, and the gasification reduction process is a chemical reaction process for heating the dried low rank coal under an oxygen-free or micro-aerobic condition. The method and the system fully and effectively use the volatiles in low rank coal to prepare the synthetic gas, so the calorific value of the synthetic gas is high; and devices of the system are simple, and are easy to operate, and most of the devices are existing devices , so the system has the advantages of low running cost, simple process, high safety, ensuring of safe and efficient preparationof the synthetic gas, and realization of reasonable and full utilization of products generated in the whole processing process of the low rank coal through the arrangement design of the system devices.

Description

technical field [0001] The invention relates to the technical field of clean utilization of coal substances, in particular to a method and system for preparing synthesis gas by utilizing volatile matter in low-rank coal. Background technique [0002] More than half of my country's proven coal reserves are low-rank coals, and the volatile matter contained in them is equivalent to 100 billion tons of oil and gas resources. Low-rank coal mainly has the material characteristics of high moisture and high volatility. When burning, the flame is long and smokey, and the degree of coalification is low. The typical coal type is lignite. my country is rich in coal and lacks oil and gas. How to efficiently utilize low-rank coal has become a major issue in today's clean coal technology. However, whether it is combustion power generation or modern coal chemical utilization, the efficiency of comprehensive utilization is extremely low because of its three characteristics of high water, hi...

AI Technical Summary

Problems solved by technology

Due to CO 2 It cannot be burned, it is an invalid gas, and because of aerobic combustion, the nitrogen content in the crude gas is too high, which reduces the energy density of the crude gas and reduces the calorific value of the crude gas, so it cannot be used as a primary raw material for chemical synthesis, except In addition to returning to the furnace for combustion, the crude gas produced by pyrolysis has no other economic value, and the utilization rate of coal raw materials is low; and there is no relevant integrated equipment that can not only use low-rank coal for continuous upgrading and gas production, but also for continuous large-scale production

Images