Method using quality-based utilization of low-rank coal to prepare oil

Abstract

The invention provides a method using the quality-based utilization of low-rank coal to prepare oil. The method has the advantages that the oil is prepared by subjecting dried low-rank gas to gasification reduction to obtain volatile components and reforming and converting hydrocarbon in the volatile components to obtain CO and H2 needed by oil synthesizing raw materials, and the volatile components in the low-rank coal are sufficiently and effectively utilized; by using quality-improved coal obtained by the gasification reduction of the low-rank coal as the raw material to prepare the oil, coal substances in the low-rank coal are utilized; the oil is prepared by using a coupling process, product hydrocarbon isomerization degree can be increased greatly, and the octane value of fuel obtained by downstream processing steps can be increased favorably. The method has the advantages that the prepared oil is high in quality, the utilization rate of the low-rank coal is increased greatly, and the method conforms to the efficient and clean coal utilization vigorously advocated by China.

Description

technical field [0001] The invention relates to the technical field of clean utilization of coal substances, in particular to a method for preparing oil by separating and utilizing low-rank coal. 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's coal is very large, so it is particularly important to use middle and low-rank coal reasonably and efficiently to produce high-quality chemical products. In recent years, with the continuous development of technologies such as coal gasification, coal pyrolysis, coal gas purification and gas separation, more and more attention has been paid to the clean and efficient utilization of middle and low rank...

AI Technical Summary

Problems solved by technology

Because CO2 cannot be combusted, it is an ineffective gas, and because of aerobic combustion, the nitrogen content in the crude gas is too high, which reduces the H2 and CO in the crude gas Energy density reduces the calorific value of the crude gas. In addition to returning to the furnace for combustion, the crude gas produced by pyrolysis is difficult to have other economic value

The biggest problem in the coal gasification process is that the chemical components contained in the coal cannot be fully utilized, and the molecules cannot be completely interrupted to produce CO, H 2 , and then chemically synthesize olefins, while low-order coal gasification reduction, reforming technology and oil production technology can maximize the chemical components in coal to be retained in the form of oil

In addition, during pyrolysis, a part of the coal will be consumed by the reaction of oxygen, resulting in less upgraded coal, and finally the amount of oil produced by upgrading coal is less or even no upgraded coal, which is a great waste Effective Coal Resources in Low Rank Coals

In addition, crude gas contains a large amount of water vapor. However, considering that the water content in low-rank coal is relatively high, and water resources are often very precious in areas rich in low-rank coal; if the precious low-rank coal can be recovered effectively at the same time Water resources, etc., use waste to prepare coal-water slurry, then burn the coal-water slurry to produce reformed gas, and use the reformed gas to prepare oil, which is of great significance to solve the insufficient water recovery and environmental pollution in the existing low-rank coal.

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