Passive self-adjusting gas-solid two-phase distributor
A distributor and self-adjusting technology, which is applied in the direction of grain processing, etc., can solve the problems of measuring instrument blockage, heavy workload, low precision, etc., and achieve the effect of prolonging service life, small equipment changes, and fast response speed
Active Publication Date: 2020-02-21
XI AN JIAOTONG UNIV
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Problems solved by technology
However, this method has the following disadvantages: the workload is large, and it is necessary to repeatedly measure the dynamic pressure of the air powder pipe online and adjust the opening of the adjustable shrinkage cavity; Blockage occurs, and the reliability of the test data is insufficient; when there is a large deviation between the operating condition and the test condition, the improvement effect is limited, and regular testing and maintenance are required
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[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0024] see figure 1 , is a schematic diagram of the supporting top seat 1 of the present invention, which is divided into an inner ring and an outer ring. The diameter of the outer ring is equal to the diameter of the air powder pipe at the outlet of the original coal mill, and the diameter of the inner ring is determined by the operating regulations and operating conditions of the coal mill, that is, the minimum wind speed that the diameter of the inner ring can pass should ensure that the pipe will not be blocked by pulverized coal Generally speaking, the operating regulations of the coal mill require that the flow rate of air powder should not be lower than 18m / s, so the diameter of the inner ring should ensure that the flow rate of air powder is greater than 18m / s. There are four connecting points on the inner and outer rings, which are evenly distribute...
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The invention discloses a passive self-adjusting gas-solid two-phase distributor. The passive self-adjusting gas-solid two-phase distributor comprises a distributor body, wherein the distributor bodycomprises a welding support top seat on the top of an outlet air powder replacement pipe, wherein the support top seat comprises an inner ring and an outer ring, and the diameter of the outer ring isequal to that of outlet air powder pipes of an original coal mill; a resistance element is arranged below the inner ring, wherein a limiting device is arranged at the bottom end of the resistance element; and a guide slide way is arranged on the outlet air powder replacement pipe, wherein the guide slide way is used for deforming the resistance element according to a fixed route. According to thepassive self-adjusting gas-solid two-phase distributor, flow resistance of each outlet air powder pipe can be dynamically adjusted in real time on the condition that the flow velocity of the air powder is adjusted and according to an actual working condition of the coal mill, the response speed is high, the workload as well as equipment movement is small, and replacement is convenient.
Description
technical field [0001] The invention relates to the technical field of a coal pulverizer system in a coal-fired power station, in particular to a passive self-adjusting gas-solid two-phase distributor. Background technique [0002] In order to achieve ultra-low emissions of nitrogen oxides, coal-fired power plants generally use low-nitrogen combustion technologies in the furnace, that is, thick-thin separation burners, air staged combustion, fuel staged combustion, etc. The common core of the above technologies is to achieve a reducing atmosphere in the main combustion area (air excess coefficient less than 1) through precise control of pulverized coal and primary / secondary air. [0003] Due to the large difference in coal quality and the error in the measurement of the primary air volume at the entrance of the coal mill, the actual operating conditions of the coal mill deviate from the design conditions, which will inevitably lead to large deviations in the air powder conce...
Claims
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IPC IPC(8): B02C23/18
CPCB02C23/18
Inventor 顾红芳方义豪
Owner XI AN JIAOTONG UNIV