Star type and spiral combined coal supply apparatus

Abstract

The invention relates to an astral-spiral joint coal feeding device which consists of an astral feeding device and a spiral feeding device connected in series; the lower part of a feed hopper (1) is connected with a double-lock hopper device (2); the lower part of the double-lock hopper device (2) is connected with the astral feeding device (3); the outlet of the astral feeding device (3) is connected with the inlet of the spiral feeding device (4); the outlet of the spiral feeding device (4) is connected with a hearth (6); a water-cooled jacket (5) is arranged on a metal tube shell of the outlet of the spiral feeding device (4); and a pressure balancing pipe (7) is arranged between the hearth (6) and the double-lock hopper device (2), the astral feeding device (3) and the spiral feeding device (4). The astral-spiral joint coal feeding device mainly solves the problems of the sealing of a rotating shaft and the stable feeding under the pressure condition, has the characteristics of convenient, safe, continuous and stable operation and the like, and can be used as a feeding system of a pressure boiler (such as a pressurization fluidized bed combustion furnace and a pressurization fluidized bed gasification furnace).

Description

Technical field [0001] The invention belongs to a material feeding device and can be used as a coal feeding device of a pressure boiler (such as a pressurized fluidized bed combustion furnace, a pressurized fluidized bed gasifier). Background technique [0002] Looking at the pressurized fluidized bed coal combustion and gasification equipment at home and abroad, the spiral coal charging device always has defects. The main problem is the wear and leakage of the packing at the shaft. The pressurized fluidized bed is a positive pressure system. The pressure difference between the inside and outside of the screw feeder is several to tens of atmospheres. In order to prevent the airflow in the furnace from leaking, the communication between the feeder and the outside must be cut off. The usual method is to use spiral grooves. The dense material plug and the packing between the rotating shaft and the screw end cover are used for sealing. This will cause two problems: ①The length of the...

AI Technical Summary

Problems solved by technology

This will bring two problems: ①The length of the plug is difficult to grasp

When the plug is too short, it is difficult to form the plug and prone to blowback; on the contrary, if the plug is too long, it will not only consume too much power, but also easily cause blockage, which will aggravate the wear of the screw shaft and the shell

②Packing sealing effect is not long

After running for a period of time, due to the wear of the journal and the packing, the sealing effect is getting worse and worse. In severe cases, the gas in the furnace will flow back to the outside of the furnace along the spiral groove, resulting in coal agglomeration in the screw feeder or coking at the feeding port, resulting in accidents. sex parking

In addition, during the process of adding coal, the leakage of coal not only pollutes the environment and wastes energy, but also becomes flammable and explosive when the coal is mixed in the air to a certain proportion.

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