CN201331054Y

CN201331054Y - Coal feeding sealing device used for circulating fluidized-bed boiler

Info

Publication number: CN201331054Y
Application number: CNU2008200911175U
Authority: CN
Inventors: 王凤君; 姜孝国
Original assignee: Harbin Boiler Co Ltd
Current assignee: Harbin Boiler Co Ltd
Priority date: 2008-10-15
Filing date: 2008-10-15
Publication date: 2009-10-21
Anticipated expiration: 2018-10-15

Abstract

A coal feeding sealing device used for a circulating fluidized-bed boiler (CFB) comprises a coal inlet pipe (1) and a coal outlet pipe (3). The coal feeding sealing device used for the CFB is characterized in that an annular directional sealing air ring (2) is formed in the connection position of the coal inlet pipe (1) inserted into the coal outlet pipe (3), high-pressure uninterrupted air is introduced into the sealing air ring (2) as a sealing medium, and the entire sealing air ring is made of a steel plate. The working principle of the sealing device is that coal enters the device vertically through the coal inlet pipe (1) and the high-pressure uninterrupted sealing air passes through the sealing air ring (2) and enters the coal outlet pipe (3) from an orbicular interlayer formed by the coal inlet pipe (1) and the coal outlet pipe (3). The sealing air flows downwards vertically under the action of the sealing air interlayer, the flowing direction is consistent with the running direction of the coal so as to prevent the high-temperature flue gas in the boiler from flowing reversely; and meanwhile, the sealing air enters in the ring direction of the coal outlet pipe (3) so as to prevent the problem of the burning of the attached wall caused by the attachment of the feeding coal to a cylinder wall at the lower part of a sealing section. Therefore, the coal feeding sealing problem in the large-scale circulating fluidized bed boiler is safely and effectively solved.

Description

A kind of coal supply sealing device that is used for fluidized-bed combustion boiler

Technical field

The invention belongs to the coal supply sealing device that uses in the CFBB, particularly a kind of pneumatic seal device.

Background technology:

Because CFBB moves under positive pressure environment, so whether the design of its coal supply sealing device successfully will directly have influence on the safe operation of unit.

The coal supply sealing device is exactly that a kind of interior high-temperature flue gas of boiler that prevents moves back to a kind of device in the coal supply system.Prior art all is that airduct is directly inserted on the coal supply pipeline, and wind and coal mixed effect are not good, easily forms the coal dust stickup on the coal supply pipeline inner wall and causes adherent burning, jeopardizes the pipeline of delivering coal and normally moves.

Summary of the invention

For addressing the above problem, what the present invention finished is a kind of coal supply sealing device that is used for fluidized-bed combustion boiler, and adopts high-pressure blast as sealing medium.

Purpose of the present invention and task are achieved by the following technical solution:

A kind of coal supply sealing device that is used for CFBB, comprise a coal feeding pipe 1 and a coal output pipe 3, it is characterized in that: there is an annular orientation formula sealing vane 2 junction that coal feeding pipe 1 inserts coal output pipe 3, be connected with uninterrupted high-pressure blast as sealing medium in the sealing vane 2, whole sealing ring is made by steel plate.

Coal at first enters coal feeding pipe 1, and high pressure sealing wind imports in the circular passage that coal feeding pipes 1 and coal output pipe 3 form by sealing vane 2 and together enters in the stove with the equidirectional coal formation bellows chamber coal that moves along the inwall of coal output pipe 3.The high-temperature flue gas that can prevent the bottom like this moves back to coal supply system, can prevent that again coal from sticking on the adherent burning of generation on the pipeline that produces coal.

Description of drawings

Fig. 1 is the structural representation of coal supply sealing device provided by the invention.

Fig. 2 is the fundamental diagram of coal supply sealing device.

The specific embodiment

Below in conjunction with description of drawings concrete structure of the present invention and preferred forms: the invention provides a kind of coal supply sealing device that is used for CFBB, comprise a coal feeding pipe 1 and a coal output pipe 3, it is characterized in that: there is an annular orientation formula sealing vane 2 junction that coal feeding pipe 1 inserts coal output pipe 3, be connected with uninterrupted high-pressure blast as sealing medium in the sealing vane 2, whole sealing ring is made by steel plate.

Coal feeding pipe 1 links to each other with the coal supply system of boiler, and the coal that comes from coal supply system at first enters the coal feeding pipe 1, and coal vertically enters coal feeding pipe 3 under the effect of gravity.The continual sealing wind of high pressure then enters system by the sealing vane 2 of coal feeding pipe 1 and coal output pipe 3 junctions.The continual sealing wind of high pressure imports in the circular passage that coal feeding pipes 1 and coal output pipe 3 form by sealing vane 2 and together enters in the stove with the equidirectional coal formation bellows chamber coal that moves along the inwall of coal output pipe 3.The high-temperature flue gas that can prevent the bottom like this moves back to coal supply system, can prevent that again coal from sticking on the adherent burning of generation on the pipeline that produces coal.

Claims

1. coal supply sealing device that is used for CFBB, comprise a coal feeding pipe (1) and a coal output pipe (3), it is characterized in that: there is an annular orientation formula sealing vane (2) junction that coal feeding pipe (1) inserts coal output pipe (3), is connected with uninterrupted high-pressure blast as sealing medium in the sealing vane (2).