Fluidized powder manifold quantitative distribution and stable injection system

Abstract

The invention discloses a fluidized powder multi-branch quantitative distribution and stable blowing system. The fluidized powder multi-branch quantitative distribution and stable blowing system is provided aiming at the problem that a blowing system in the prior art fails to realize quantitative control of each branch. The system comprises a quantitative distribution mechanism which comprises a distribution body, a distribution cone, a plurality of ejector nozzles and distribution rings. The distribution body comprises a conical shell, a powder inlet and a plurality of powder outlets, the bottom of the distribution cone is connected with the top wall of the conical shell, the distribution cone and the conical shell are in axially spaced arrangement, the distribution rings are matched with distribution grooves respectively, and powder passages are formed at positions, corresponding to powder outlet through holes, of the distribution rings. Each powder passage comprises a contraction section and an expansion section, a large-diameter end of each contraction section faces a corresponding inner powder outlet through hole, and a large-diameter end of each expansion section faces a corresponding outer powder outlet through hole. The ejector nozzles and the powder outlets are in coaxial arrangement. The fluidized powder multi-branch quantitative distribution and stable blowing system is effective in quantitative powder distribution for blowing branches.

Description

technical field [0001] The invention relates to a fluidized state powder multi-branch pipe quantitative distribution and stable injection system. Background technique [0002] In the process of distribution and injection of various powder materials such as coal powder, mineral powder, etc. in a single main pipe plus multiple branch pipes, it is very important to ensure the uniform distribution of materials on the branch pipes. For example, in the process of coal injection in blast furnaces, especially large and medium-sized blast furnaces, the inconsistency in the amount of pulverized coal injection at each tuyere will lead to temperature differences in the circumferential direction of the hearth, which will have an adverse effect on the "direct movement" of the blast furnace. In the coal injection process of the lime kiln, if the adjustment and control of the pulverized coal flow is unstable, and the distribution of the pulverized coal flow in each branch pipe is uneven, th...

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Problems solved by technology

But in fact, it is difficult to guarantee the distribution accuracy of pulverized coal distributors on the market. It is not easy for the distribution accuracy of each branch to reach 5%. Moreover, with the wear and tear of the distributor, its distribution error will become larger and larger, seriously affecting Uniform injection of pulverized coal

The equal length design of the branch pipes not only increases the length of the branch pipes (more than 70% increase in the amount of materials) and the difficulty of construction and maintenance, but also increases the resistance loss of each branch pipe with the increase of the branch pipe length, and the resulting blowing pressure loss and energy loss also increase. will increase

[0004] The above two factors have great restrictions on the quantitative distribution of fluidized powder, but this is not the most important thing. The most important thing is that the prior art lacks adjustment means for each branch pipe, and the injection volume of each branch pipe depends on the injection condition. Under the change, it can only change in the same trend (same increase or decrease), and it is difficult to meet the requirements of quantitative distribution and precise injection of each branch according to the set value

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