Oil-electricity co-production process using coal and natural gas as raw materials

Abstract

The invention discloses an oil-electricity co-production process using coal and natural gas as raw materials, and belongs to the fields of coal chemical industry and natural gas chemical industry. Theoil-electricity co-production process comprises the following steps: with coal and natural gas as raw materials, gasifying part of the coal and mixing the gasified coal with synthesis gas obtained bynatural gas reforming, adjusting the hydrogen to carbon ratio to about 2, lowering the temperature of the synthesis gas through a heat exchange unit, removing acid gas through a water washing unit, then feeding into a Fischer-Tropsch reactor to prepare synthetic oil, and separating to obtain a gasoline product. Wherein heat required for natural gas reforming is provided by combustion of residualcoal, so as to couple heat inside the system; and excess energy of the system is used to produce electricity. The oil-electricity co-production process realizes the optimal hydrogen-carbon ratio required for production of synthetic oil from the source, omits a hydrogen-carbon ratio adjusting unit necessary in single raw material technology, reduces the dependence of traditional oil synthesis technology on the single raw material market, and has the characteristics of simple process, less equipment investment, strong operation flexibility, no pollution and high productivity.

Description

technical field [0001] The invention belongs to the fields of coal chemical industry and natural gas chemical industry, and specifically relates to an oil-electricity cogeneration process using coal and natural gas as raw materials. Background technique [0002] With the rapid development of the national economy, my country's demand for oil continues to grow, but due to the shortage of oil reserves in my country, oil resources cannot meet the needs of the national economy, which increases the dependence on oil imports, making energy security issues increasingly Serious, but also limit the sustainable development of the national economy. Therefore, the development of clean, efficient and advanced oil synthesis technology to realize the adjustment of industrial structure and the protection of ecological environment has become an important topic of current research. [0003] The existing methods for producing synthetic oil mainly involve two technologies, that is, coal-to-synth...

AI Technical Summary

Problems solved by technology

The disadvantages of this technology to produce synthetic oil are: (1) The complete gasification process of pulverized coal is technically difficult and energy-intensive; (2) The hydrogen-carbon ratio of the crude synthesis gas produced is less than 2, which is not suitable for the Fischer-Tropsch synthesis reaction gas It is necessary to increase the water-steam shift reaction to adjust the hydrogen-carbon ratio of the syngas; (3) in the water-steam shift unit, it is necessary to provide additional medium-pressure steam, and the energy consumption is relatively large; (4) the carbon dioxide emission of this process is relatively large, Not conducive to environmental protection

The disadvantages of this technology are: (1) In the production stage of synthesis gas, additional natural gas needs to be burned for heating, and the production efficiency is low; (2) The hydrogen-carbon ratio of the crude synthesis gas produced is greater than 2, which is not suitable for the Fischer-Tropsch synthesis reaction. To obtain the optimal ratio of gas, it is necessary to increase the reverse water vapor shift reaction to adjust the hydrogen-carbon ratio of the syngas; (3) In the process of the reverse water vapor shift reaction unit, carbon dioxide with high purity is required as a raw material, which increases the investment cost accordingly