Powdery fuel preheating gas generator and corresponding powdery fuel boiler

Abstract

The invention relates to a powdery fuel preheating gas generator and a corresponding powdery fuel boiler. An existing pulverized coal preheating burner and a corresponding boiler are small in operation elastic space, so that the pulverized fuel preheating gas generator comprises a preheating combustion chamber, a gas-solid separator and a return feeder, and further comprises an auxiliary gas-solidseparator which is arranged in the middle section of a gas outlet pipe connected with a gas outlet in the top of the gas-solid separator. The auxiliary gas-solid separator comprises an expanded shell, the area of the cross section of an inner cavity of the expanded shell is larger than or equal to 1.3 times that of the cross section of the gas outlet pipe, and the height of the expanded shell islarger than or equal to 0.5 m. And a gas-solid pre-separation chamber can be additionally arranged at the upper part of the preheating combustion chamber. The powdery fuel horizontal boiler comprisesa horizontal boiler body and a powdery fuel preheating burner. The powdery fuel preheating gas generator has the advantages of large operation elastic space, easiness in operation balance and easinessin maintenance after balance, and is suitable for various existing industrial and power station boilers.

Description

technical field [0001] The invention relates to a pulverized fuel preheating gas generator and a corresponding pulverized fuel boiler (including a pulverized fuel horizontal combustion boiler and a pulverized fuel vertical combustion boiler). Background technique [0002] The Chinese invention patent authorized on March 23, 2018 with the announcement number CN 104791775 B discloses a vertical pulverized coal boiler with a bottom burner. Combined waste heat boiler. [0003] The pulverized coal preheating burner disclosed in CN 104791775 B includes a preheating combustion chamber, a gas-solid separator and a feeder connected in sequence, and the three form a circulating fluidized bed gas generator. The vertical pulverized coal boiler has the advantages of sufficient combustion, small tail gas treatment burden, high efficiency, energy saving and environmental protection. [0004] The core of the pulverized coal preheating burner is a fluidized bed structure, in which quartz s...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is how to overcome the small operating elastic space of the existing pulverized coal preheating burner and the corresponding vertical pulverized coal boiler, the difficulty in establishing the material balance during operation, and the difficulty in maintaining the material balance after the establishment of the material balance. to provide a powdery fuel preheating gas generator and corresponding powdery fuel boilers (including powdery fuel horizontal combustion boilers and powdery fuel vertical combustion boilers) with large operating flexibility space and long-term maintenance of material balance operation ), in order to improve the safety and reliability of boiler operation

This is the main reason why the existing pulverized coal preheating burner and vertical boiler have small elastic space, the material balance is not easy to establish during operation, and it is difficult to maintain the easy-to-run bottom material after the material balance is established.

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