Turbulent flow pulverized coal mixer structure

Abstract

The utility model relates to the technical field of pulverized coal mixing equipment, in particular to a turbulent flow pulverized coal mixer structure, and aims to solve the problem that the overall combustion efficiency of a pulverized coal boiler is finally affected due to the fact that pulverized coal and air are easily mixed unevenly due to the influence of air pressure and cohesiveness in the process of mixing the pulverized coal and the air required by combustion at present. The mixer structure is mainly composed of an air pipe, a powder falling pipe, a flow collecting contracted pipe, a turbulent flow air opening and the like, the powder falling pipe is additionally arranged at the top of a conventional air pipe, the flow collecting contracted pipe is additionally arranged at a branch pipe air inlet, and the turbulent flow air opening is formed in the top, right opposite to the powder falling pipe, of the flow collecting contracted pipe, so that pulverized coal is subjected to the turbulent flow air effect of the turbulent flow air opening when falling from the powder falling pipe; the pulverized coal and the air are mixed in time, the uniformity of a mixed medium entering the combustion hearth is ensured, meanwhile, the pulverized coal and the air are fully mixed, the powder carrying capacity of primary air is improved, the pulverized coal is effectively prevented from being deposited above the flow collecting necking opening, and then the overall combustion efficiency in the combustion hearth is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder mixing equipment, in particular to a turbulent coal powder mixer structure. Background Art

[0002] In industrial production, most pulverized coal boilers use an intermediate storage chamber pulverizing system. The pulverized coal is fed into the furnace for combustion through a pulverizer feeder and a pulverizer drop pipe, and then through a pulverized coal mixer and a burner. The pulverized coal mixer is a device used to mix pulverized coal and the air required for combustion. In the existing pulverized coal mixer technology, the pulverized coal mixer's air duct is narrowed and extends into the front end of the pulverized coal drop pipe. The pulverized coal is fed through a pulverizer feeder and falls into the mixer under the action of gravity. The pulverized coal is mixed with air in the mixer. However, due to the influence of wind pressure and the cohesiveness of pulverized coal, the mixing ratio of pulverized coal and air is very likely to be uneven, which greatly affects the combustion efficiency of the pulverized coal boiler. Utility Model Content

[0003] The utility model provides a turbulent coal powder mixer structure to solve the problems existing in the above background.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A turbulent coal powder mixer structure comprises an air duct, one side of the air duct is provided with an air inlet, the other side of the air duct is provided with an air outlet, a powder dropping pipe is vertically provided on the top of the air duct, a collecting shrinkage tube is sleeved inside the air inlet, and a turbulent air outlet is also provided on the top of the collecting shrinkage tube and the powder dropping tube.

[0006] Furthermore, a collecting port is provided on one side of the collecting and contracting tube close to the air outlet.

[0007] The utility model has the following beneficial effects:

[0008] The utility model provides a turbulent coal powder mixer structure, which is mainly composed of components such as an air duct, a powder dropping pipe, a collecting contraction pipe, and a turbulent air outlet. A powder dropping pipe is installed on the top of a conventional air duct, and a collecting contraction pipe is installed at the air inlet of the branch pipe, and a turbulent air outlet is opened at the top of the collecting contraction pipe and the powder dropping pipe. When the coal powder falls from the powder dropping pipe, it is affected by the turbulent wind from the turbulent air outlet and mixed with the air in time, thereby ensuring the uniformity of the mixed medium entering the combustion furnace. At the same time, sufficient coal powder and air mixing improves the powder carrying capacity of the primary air, effectively avoiding the deposition of coal powder above the collecting contraction pipe, thereby improving the overall combustion efficiency in the combustion furnace, and solving the problem that in the current mixing process of coal powder and air required for combustion, due to the influence of wind pressure and adhesion, uneven mixing of coal powder and air is very likely to occur, thereby ultimately affecting the overall combustion efficiency of the coal powder boiler.

[0009] The utility model discloses that the pulverized coal is affected by the turbulent wind in the powder dropping pipe, is mixed with the air in advance, and is mixed with the airflow in the mixer more evenly. The stable airflow can continuously bring the pulverized coal into the combustion furnace, thereby ensuring the full combustion of the pulverized coal in the furnace. The contact and action time between the primary air and the pulverized coal is prolonged, the powder-carrying capacity of the primary air is enhanced, and the deposition of the pulverized coal above the collecting constriction is reduced. At the same time, the positive pressure effect of the powder dropping pipe area is significant, so that the pulverized coal is more easily brought into the furnace by the airflow, thereby effectively avoiding the powder support phenomenon at the powder dropping pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0011] The meanings of the reference numerals are as follows:

[0012] 1. Air duct; 2. Powder drop pipe; 3. Air outlet; 4. Air inlet; 5. Flow collecting shrinkage tube; 6. Flow collecting port; 7. Turbine vent. DETAILED DESCRIPTION

[0013] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0014] like Figure 1 As shown, a turbulent coal powder mixer structure includes an air duct 1, an air inlet 4 is provided on one side of the air duct 1, an air outlet 3 is provided on the other side of the air duct 1, a powder falling pipe 2 is vertically provided on the top of the air duct 1, a collecting shrinkage tube 5 is provided inside the air inlet 4, and a turbulent air outlet 7 is also provided on the top opposite to the collecting shrinkage tube 5 and the powder falling pipe 2.

[0015] A collecting port 6 is also provided on one side of the collecting and contracting tube 5 close to the air outlet 3 .

[0016] During the specific application of the utility model, when the turbulent wind enters the collecting and contracting tube 5 from the air inlet 4, the turbulent effect of the turbulent air outlet 7 makes the coal powder dropped from the powder dropping pipe 2 contact and mix with the turbulent air in time, and be discharged from the air outlet 3 into the combustion furnace in time for full combustion, so that the coal powder is affected by the turbulent wind in the powder dropping pipe 2 and mixed with the air in advance, and the mixing with the airflow in the mixer is more uniform, and the probability of coal powder being deposited above the collecting and contracting tube 5 is reduced, and the powder support phenomenon at the powder dropping pipe 2 is effectively avoided, thereby improving the overall efficiency of the furnace combustion. Therefore, the coal powder mixer structure has good practicality.

Claims

1. A turbulent coal powder mixer structure, comprising an air duct (1), an air inlet (4) being provided on one side of the air duct (1), and an air outlet (3) being provided on the other side of the air duct (1), wherein: A powder dropping pipe (2) is vertically arranged on the top of the air duct (1), a flow collecting shrinkage pipe (5) is sleeved inside the air inlet (4), and a spoiler air outlet (7) is also provided on the top of the flow collecting shrinkage pipe (5) and the powder dropping pipe (2) facing each other.

2. A turbulent coal powder mixer structure according to claim 1, characterized in that: A collecting port (6) is also provided on a side of the collecting and contracting tube (5) close to the air outlet (3).

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