Fischer-Tropsch synthesis method for wax by utilizing low-rank coal

Abstract

The invention provides a Fischer-Tropsch synthesis method for wax by utilizing low-rank coal. The Fischer-Tropsch synthesis method comprises the following steps: drying the low-rank coal to obtain dried low-rank coal and waste gas; removing dust from the waste gas to obtain coal powder; gasifying and reducing the dried low-rank coal under an oxygen-free or micro-aerobic condition to obtain an oil-gas mixture and quality-improved coal; preparing the oil-gas mixture into mixed gas and wastewater; reforming and transforming the mixed gas to prepare synthetic gas; preparing coal water slurry through the wastewater, the coal powder and a coal water slurry additive and then preparing synthetic gas; preparing synthetic gas by utilizing the quality-improved coal; after mixing the three types of synthetic gas, removing CO2 and supplementing H2 or CO to adjust a hydrogen-carbon ratio of the synthetic gas to be 1.5 to 2.2; carrying out distillate oil steam stripping and the like on a product, which is obtained by carrying out Fischer-Tropsch synthesis reaction on the synthetic gas, to obtain wax, heavy oil and naphtha. According to the Fischer-Tropsch synthesis method provided by the invention, the low-rank coal is used for producing light oil, the heavy oil and the wax through a Fischer-Tropsch synthesis technology and is convenient to transport, and the utilization rate of resources isimproved; the source of raw materials is wide, the energy consumption of the technology is low, wastes are utilized and the production cost is easy to save.

Description

technical field [0001] The invention relates to the technical field of clean utilization of coal substances, in particular to a method for synthesizing wax by using low-rank coal Fischer-Tropsch. Background technique [0002] my country is a country rich in coal, poor in oil, and low in gas. Coal consumption accounts for more than 60% of primary energy consumption, which determines that it will be difficult to change the coal-based energy structure for a long period of time. Judging from the proven quality of coal mines, the proportion of middle and low-rank coal in my country is very large, so it is particularly important to use middle and low-rank coal reasonably and efficiently to produce high-quality chemical products. [0003] At present, the methods and means of utilizing coal resources in our country are relatively simple, and they are simply burned to obtain the combustion chemical energy. This simple utilization method is not only a huge waste of energy resources, b...

AI Technical Summary

Problems solved by technology

However, considering that the water content in low-rank coal is high, and water resources are often very precious in areas rich in low-rank coal; , which is of great significance to solve the insufficient water recovery and environmental pollution in the existing low-rank coal

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