A pressurized moving bed coal gasifier high-temperature gas dust removal and waste heat recovery device and method thereof
A technology of coal gasification and moving bed, which is used in gas dust removal, steam generation method using heat carrier, and combustible gas purification, etc. The effect of solving difficult governance and reducing the amount of medium-pressure steam
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Embodiment 1
[0059] The crude gas from the pressurized moving bed coal gasifier, the dry gas flow rate is 38000Nm 3 / h, the water vapor flow rate is 18t / h, the temperature is 520°C, and the dust content is 10g / Nm 3 Dry gas, the dust content after passing through the cyclone separator 1 is reduced to 1.0g / Nm 3 Dry gas, after passing through the tubular membrane filter 2, the dust content is reduced to 50mg / Nm 3 dry air. The low-dust gas then enters the steam superheater 3, heats the saturated steam generated by the waste heat boiler 4 to 400°C, and enters the external medium-pressure steam pipeline 14. The gas temperature from the steam superheater 3 drops to 380°C, enters the waste heat boiler 4 to recover heat and further cools down to 260°C, and the waste heat boiler 4 produces 5.7t / h of 3.7MPa saturated steam.
[0060] The gas coming out of the waste heat boiler 4 enters the water scrubber 5, and directly sprays and contacts with the cooling washing water with a circulation rate of 1...
Embodiment 2
[0064] The crude gas from the pressurized moving bed coal gasifier, the dry gas flow rate is 36000Nm 3 / h, the water vapor flow rate is 18t / h, the temperature is 500°C, and the dust content is 5g / Nm 3 Dry gas, the dust content after passing through the cyclone separator 1 is reduced to 0.8g / Nm 3 Dry gas, after passing through the tubular membrane filter 2, the dust content is reduced to 50mg / Nm 3 dry air. The low-dust gas then directly enters the 9.0t / h, 4.0MPa saturated steam generated by the waste heat boiler 4 through the clean gas pipeline 28 to indirectly heat the water therein, and the saturated steam directly enters the steam pipeline 14 through the saturated steam pipeline 25 . The temperature of the gas coming out from the waste heat boiler 4 is lowered to 267°C.
[0065] The gas coming out of the waste heat boiler 4 enters the water scrubber 5, and directly sprays and contacts with the cooling washing water with a circulation rate of 130 tons / hour from the booster...
Embodiment 3
[0069] The crude gas from the pressurized moving bed coal gasifier, the dry gas flow rate is 35000Nm 3 / h, the water vapor flow rate is 17t / h, the temperature is 510°C, and the dust content is 1.5g / Nm 3 Dry gas, the dust content after directly entering the tubular membrane filter 2 through the gas pipeline 24 is reduced to 70mg / Nm 3 dry air. The low-dust gas then enters the steam superheater 3, heats the saturated steam generated by the waste heat boiler 4 to 390°C, and enters the external medium-pressure steam pipeline 14. The gas temperature from the steam superheater 3 drops to 385°C, enters the waste heat boiler 4 to recover heat and further cools down to 260°C, and the waste heat boiler 4 produces 5.5t / h of 3.8MPa saturated steam.
[0070] The gas coming out of the waste heat boiler 4 enters the water washing tower 5, and directly sprays and contacts with the cooling washing water with a circulation rate of 110 tons / hour from the booster pump 8, and the temperature of the...
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