Coupling method of coal gasification technology and steam turbine generating technology
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
[0038] refer to Figure 4 , 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. The reacted mixture is exchanged with 23MPa water from the booster pump in the first heat exchanger, and the pressurized water is turned...
Embodiment 2
[0040] also 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. The reacted mixture is exchanged with 23MPa water from the booster pump in the first heat exchanger, and the pressurized water is turned into high-temperature and high-pressure steam with a temperature of 400°C and an absolute pressure of 15MPa, and...
Embodiment 3
[0042] 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.
[0043] The advantages of the present invention are as follows:
[0044] The coupling method of the coal gasification process and the steam turbine power generation process of the present invention improves the energy efficiency of the system. First, the heat source in the Rankine cycle is taken from the sensible heat recovery of the reacted mixture after the gasification reaction, and no external heat source is needed, which saves the commonly used boiler and superheater. Secondly, the water cooled by the low-temperature and low-pressure gas after expansion and decompression is used to replace the 32°C water ...
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