A method for preparing methanol and oil from low-rank coal by polygeneration

Abstract

The invention provides a method using the quality-based utilization of low-rank coal to prepare methanol and oil in a poly-generation manner. The method has the advantages that the dried low-rank coalis subjected to gasification reduction to obtain volatile components, hydrocarbon and the like in the volatile components is reformed and converted to obtain CO and H2 needed by oil synthesizing so as to prepare the methanol and the oil, and the volatile components in the low-rank coal are sufficiently and effectively utilized; by using the quality-improved coal obtained by the gasification reduction of the low-rank coal as the raw material to prepare the methanol and the oil, the coal substances in the low-rank coal are fully utilized; the methanol and the oil are prepared in the poly-generation manner, byproducts generated by the synthesizing process of the methanol or the oil can be effectively recycled, resources can be saved, multiple approaches are achieved, the prepared oil and methanol are few in impurities and high in quality, the utilization rate of the low-rank coal is increased greatly, and the method conforms to efficient and clean coal utilization vigorously advocated byChina.

Description

technical field [0001] The invention relates to the technical field of clean utilization of coal substances, in particular to a method for preparing methanol and oil by using polygeneration of 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 ...

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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