Method for coupling coal gasification process and steam turbine power generation process
A technology of coal gasification and steam, which is used in the gasification of granular/powdered fuels, the petroleum industry, the manufacture of combustible gases, etc.
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Embodiment 1
[0054] refer to Figure 4 , taking the pressurized entrained entrained bed gasification of bituminous coal as an example. Coal is crushed and ground to make coal powder, mixed with water to make coal-water slurry, and then pumped (not shown in the figure) to the gasifier. At the same time, oxygen or air is fed into the gasification furnace as a gasification agent. The operating temperature of the gasification furnace is about 1400° C. and the operating pressure is 5.0 MPa. Coal reacts with the above-mentioned gasifying agent at high temperature to generate gas rich in carbon monoxide, hydrogen, carbon dioxide, and methane. The post-reaction mixture exiting the gasifier includes coal gas, tar and unreacted gasification agent. After the reaction, the mixture exchanges heat with 23MPa water from the booster pump in the first heat exchanger to generate steam, which enters the steam turbine to expand and generate power and becomes exhaust steam, which can be controlled at a tempe...
Embodiment 2
[0056] refer to Figure 5 , taking the pressurized fluidized bed gasification of bituminous coal as an example. The coal is crushed and ground to make coal powder with a particle size of less than 6 mm, and then sent from the coal bunker to the gasifier through a screw feeder, an atmospheric lock hopper, and a pressurized lock hopper (these four are not shown in the figure) . At the same time, oxygen and steam are fed into the gasification furnace as gasification agents. The operating temperature of the gasification furnace is about 900-1000° C. and the operating pressure is 1.0-2.6 MPa. Coal reacts with the above-mentioned gasifying agent at high temperature to generate gas rich in carbon monoxide, hydrogen, carbon dioxide, and methane. The post-reaction mixture exiting the gasifier includes coal gas, tar and unreacted gasification agent. After the reaction, the mixture exchanges heat with 23MPa water from the booster pump in the first heat exchanger to generate steam, whi...
Embodiment 3
[0059] In this embodiment, only step a adopts dry distillation and gasification of coal under air-isolated conditions, which can be low-temperature dry distillation (below 550°C), medium-temperature dry distillation (550°C-750°C), and high-temperature dry distillation (above 900°C), resulting in Dry distillation gas, all the other steps are identical with embodiment 1.
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