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Coupling method of coal gasification process, residual carbon oxidation process and steam turbine power generation process

An oxidation process, a technology for coal gasification, used in chemical instruments and methods, carbon compounds, granular/powdered fuel gasification, etc.

Active Publication Date: 2012-03-14
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, the above process of combining coal gasification and steam turbine power generation only utilizes the steam generated during the coal gasification process, that is, only the steam generated during the coal gasification process makes the coal gasification process and the steam turbine power generation process take place There is still room for improvement in the degree of energy integration and process integration

Method used

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  • Coupling method of coal gasification process, residual carbon oxidation process and steam turbine power generation process
  • Coupling method of coal gasification process, residual carbon oxidation process and steam turbine power generation process
  • Coupling method of coal gasification process, residual carbon oxidation process and steam turbine power generation process

Examples

Experimental program
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Embodiment 1

[0069] refer to Figure 4 , taking the catalytic gasification of bituminous coal and supercritical water as an example. Coal is crushed and ground to make coal powder with a particle size of less than 150 microns, and the catalyst Na 2 CO 3 (consumption amount is 10% of coal powder mass) and water to prepare coal water slurry with coal powder dry base concentration of 40%. The process of preparing coal water slurry is not in Figure 4 drawn in. The coal-water slurry is pressurized, preheated to 23MPa, and enters the gasifier at 550°C, and oxygen is introduced into the gasifier at the same time. Part of the coal-water slurry reacts with the added oxygen in the gasifier, raising the temperature to 650°C. In the supercritical state, coal and water react under the action of a catalyst to produce methane-rich synthesis gas and slurry carbon residue. The main components of syngas are methane, carbon monoxide, carbon dioxide, hydrogen, etc. The post-reaction mixture exiting th...

Embodiment 2

[0071] refer to Figure 5 , taking the catalytic gasification of bituminous coal and supercritical water as an example. Coal is crushed and ground to make coal powder with a particle size of less than 150 microns, and the catalyst Na 2 CO 3 (consumption amount is 10% of coal powder mass) and water to prepare coal water slurry with coal powder dry base concentration of 40%. The process of preparing coal water slurry is not in Figure 5 drawn in. The coal-water slurry is pressurized, preheated to 23MPa, and enters the gasifier at 550°C, and oxygen is introduced into the gasifier at the same time. Part of the coal-water slurry reacts with the added oxygen in the gasifier, raising the temperature to 650°C. In the supercritical state, coal and water react under the action of a catalyst to produce methane-rich synthesis gas and slurry carbon residue. The main components of syngas are methane, carbon monoxide, carbon dioxide, hydrogen, etc. The post-reaction mixture exiting th...

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Abstract

The invention discloses a coupling method of a coal gasification process, a residual carbon oxidation process and a steam turbine power generation process. The technology comprises the steps of: cooling a high temperature reacted mixture departing from a coal gasifier so as to obtain high temperature and high pressure steam, which is then subjected to power generation in a Rankine cycle, separating the reacted mixture so as to obtain slurry-like residual carbon and syngas, leaving the slurry-like residual carbon to complete oxidation in subcritical or supercritical water with the presence of excess oxygen, thus obtaining a mixture of carbon dioxide and water, introducing the low temperature water obtained from decompressional expansion and gas-liquid separation of the mixture of carbon dioxide and water, as well as the low temperature syngas obtained from decompressional expansion of the syngas into a condenser of the Rankine cycle, or first using the low temperature water and the low temperature syngas to cool cooling water, then leading the cooling water the condenser of the Rankine cycle so as to serve as a cooling medium for exhaust steam cooling, thus improving the power generation efficiency of the Rankine cycle.

Description

field of invention [0001] The invention relates to the field of polygeneration of coal, in particular to the field of gas-electricity cogeneration using coal as raw material. Background technique [0002] Coal gasification technology is the most important way of clean and efficient coal utilization, and it is also one of the key links in the development of high-tech energy. Currently relatively mature coal gasification processes include Lurgi gasification process, Shell gasification process and GE (Texaco) gasification process. Considering the gasification rate, the common features of these gasification processes are that the gasification temperature is usually above 1000 °C, and the composition of the syngas is mainly CO and H 2 . Due to the high gasification temperature of coal and the high carbon conversion rate in these gasification processes, there is basically no carbon residue problem. [0003] For the process of producing syngas or methane by catalytic gasificatio...

Claims

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Application Information

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IPC IPC(8): C10J3/54C10J3/46C10J3/72C10J3/84F01D15/10C01B31/20C01B32/50
CPCY02E20/18Y02P20/129Y02P20/54
Inventor 谷俊杰李金来甘中学
Owner ENN SCI & TECH DEV
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