阅读说明：本技术 一种改进型分体式紧凑型煤粉分配器 (Improved split type compact pulverized coal distributor ) 是由 员盼锋 杨培军 刘定坡 晋中华 周虹光 王岩 刘洋 赵卫东 时勇强 赵军旗 于 2020-07-21 设计创作，主要内容包括：本发明公开了一种改进型分体式紧凑型煤粉分配器,包括文丘里式扩散段、若干分体式仓体、若干阻力调整箱、若干方圆变径管及若干出粉管；磨煤机分离器的顶部出口与文丘里式扩散段的底部入口相连通,各分体式仓体的底部入口与文丘里式扩散段的顶部出口相连通,一个分体式仓体对应一个阻力调整箱、一个方圆变径管及一个出粉管,阻力调整箱的底部入口与对应分体式仓体的顶部出口相连通,方圆变径管的底部入口与对应阻力调整箱的顶部出口相连通,出粉管的底部入口与对应方圆变径管的顶部入口相连通,该分配器能够进一步有效降低煤粉分配的偏差,同时安装较为方便。(The invention discloses an improved split type compact pulverized coal distributor, which comprises a Venturi type diffusion section, a plurality of split type bin bodies, a plurality of resistance adjusting boxes, a plurality of square and round reducer pipes and a plurality of powder outlet pipes, wherein the Venturi type diffusion section is arranged on the Venturi type diffusion section; the top export of coal pulverizer separator is linked together with the bottom entry of venturi diffusion section, the bottom entry of each split type storehouse body is linked together with the top export of venturi diffusion section, a split type storehouse body corresponds a resistance adjustment case, a square circle reducing pipe and a play powder pipe, the bottom entry of resistance adjustment case is linked together with the top export that corresponds the split type storehouse body, the bottom entry of square circle reducing pipe is linked together with the top export that corresponds the resistance adjustment case, the bottom entry that goes out the powder pipe is linked together with the top entry that corresponds square circle reducing pipe, this distributor can further effectively reduce the deviation of buggy distribution, it is comparatively convenient to install simultaneously.)

1. An improved split type compact pulverized coal distributor is characterized by comprising a Venturi type diffusion section (1), a plurality of split type bin bodies (2), a plurality of resistance adjusting boxes (3), a plurality of square and round reducing pipes (4) and a plurality of powder outlet pipes (5);

the top export of coal pulverizer separator is linked together with the bottom entry of venturi diffusion section (1), the bottom entry of each split type storehouse body (2) is linked together with the top export of venturi diffusion section (1), a split type storehouse body (2) corresponds a resistance adjustment case (3), a square circle reducing pipe (4) and one play powder pipe (5), the bottom entry of resistance adjustment case (3) is linked together with the top export that corresponds split type storehouse body (2), the bottom entry of square circle reducing pipe (4) is linked together with the top export that corresponds resistance adjustment case (3), the bottom entry that goes out powder pipe (5) is linked together with the top entry that corresponds square circle reducing pipe (4).

2. The improved split compact pulverized coal distributor as claimed in claim 1, wherein the split bin body (2) is provided with a pulverized coal amount adjusting baffle (6).

3. The improved split compact pulverized coal distributor as claimed in claim 1, wherein the resistance adjusting box (3) is provided with an air volume adjusting baffle (7).

4. The improved split compact pulverized coal dispenser as claimed in claim 1, wherein the resistance adjusting box (3) has a square structure in cross section.

5. The improved split compact pulverized coal distributor as claimed in claim 1, wherein the split bin body (2) is a rectangular parallelepiped box body.

6. The improved split compact pulverized coal distributor as claimed in claim 1, wherein each split bin body (2) is distributed in turn along the circumferential direction.

Technical Field

The invention belongs to the field of gas-solid two-phase flow conveying, and relates to an improved split type compact pulverized coal distributor.

Background

The coal-fired boiler of the large power station generally adopts a medium-speed mill direct-blowing type pulverizing system, compared with a storage type pulverizing system, primary air powder in each coal powder pipeline at the outlet of a medium-speed coal mill is directly supplied to each burner in real time, and whether the distribution of the coal powder quantity and the air quantity in each coal powder pipeline at the outlet of the medium-speed coal mill is uniform or not directly influences the combustion intensity distribution in the boiler. Under the large background that a coal-fired unit develops towards higher safety, economy, environmental protection and flexibility, higher requirements are provided for the air-powder distribution uniformity of outlets of all burners in a furnace, and a pulverized coal distributor, as a device for solving the problems, undergoes the technical development of generations, and aims to continuously reduce the pulverized coal quantity and air quantity deviation among pulverized coal pipelines on the premise of considering resistance, installation space and adjustability.

At present, the advanced type that the deviation of coal powder distribution is controlled within 10% and the deviation of wind speed is controlled within 5% mainly comprises a double-adjustable coal powder distributor and a compact coal powder distributor, wherein the double-adjustable coal powder distributor can even control the deviation of coal powder distribution within 5%, but the compact coal powder distributor has small volume, low cost, low requirement on-site modification space and wider application range. The compact pulverized coal distributor still has some defects, such as the problem that pulverized coal distribution deviation is difficult to further reduce due to the influence of inlet inflow nonuniformity, and the problem that the annular pulverized coal distribution box cannot be installed when meeting the motor side arrangement of the dynamic separator.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an improved split type compact pulverized coal distributor which can further effectively reduce the deviation of pulverized coal distribution and is convenient to install.

In order to achieve the aim, the improved split type compact pulverized coal distributor comprises a Venturi type diffusion section, a plurality of split type bin bodies, a plurality of resistance adjusting boxes, a plurality of square and round reducer pipes and a plurality of powder outlet pipes;

the top export of coal pulverizer separator is linked together with the bottom entry of venturi diffusion section, the bottom entry of each split type storehouse body is linked together with the top export of venturi diffusion section, a split type storehouse body corresponds a resistance adjustment case, a square circle reducing pipe and a play powder pipe, the bottom entry of resistance adjustment case is linked together with the top export that corresponds the split type storehouse body, the bottom entry of square circle reducing pipe is linked together with the top export that corresponds the resistance adjustment case, the bottom entry that goes out the powder pipe is linked together with the top entry that corresponds the square circle reducing pipe.

The split type bin body is provided with a powder quantity adjusting baffle.

And an air quantity adjusting baffle is arranged on the resistance adjusting box.

The cross section of the resistance adjusting box is of a square structure.

The split type bin body is a cuboid box body.

All the split bin bodies are distributed in sequence along the circumferential direction.

The invention has the following beneficial effects:

when the improved split type compact coal powder distributor is specifically operated, the Venturi type diffusion section is used for replacing the existing conical diffusion section, so that the radial distribution uniformity of coal powder particles with the annular cross section at the outlet of the diffusion section is improved, the airflow speed change in the Venturi structure is large, the sufficient mixing of air and powder is facilitated, the original coal powder distribution deviation at the inlet of the bin body is reduced, and the coal powder quantity distribution deviation among coal powder pipelines can be further reduced; meanwhile, the split-type bin body is adopted, so that the field arrangement is more flexible, the problem that the split-type bin body is difficult to install due to the arrangement of the motor on the side of the dynamic separator is solved, and the split-type bin body is easier to process, transport and install.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a cross-sectional view taken at a-a in fig. 1.

Wherein, 1 is a Venturi type diffusion section, 2 is a split type bin body, 3 is a resistance adjusting box, 4 is a square and round reducer pipe, 5 is a powder outlet pipe, 6 is a powder quantity adjusting baffle, and 7 is an air quantity adjusting baffle.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1 and 2, the improved split compact pulverized coal distributor of the present invention comprises a venturi-type diffusion section 1, a plurality of split bin bodies 2, a plurality of resistance adjustment boxes 3, a plurality of square and round reducer pipes 4 and a plurality of powder outlet pipes 5; the top export of coal pulverizer separator is linked together with the bottom entry of venturi diffusion section 1, the bottom entry of each split type storehouse body 2 is linked together with the top export of venturi diffusion section 1, a split type storehouse body 2 corresponds a resistance adjustment case 3, a square circle reducing pipe 4 and a play powder pipe 5, the bottom entry of resistance adjustment case 3 is linked together with the top export that corresponds split type storehouse body 2, the bottom entry of square circle reducing pipe 4 is linked together with the top export that corresponds resistance adjustment case 3, the bottom entry that goes out powder pipe 5 is linked together with the top entry that corresponds square circle reducing pipe 4.

A powder quantity adjusting baffle 6 is arranged on the split type bin body 2; an air quantity adjusting baffle 7 is arranged on the resistance adjusting box 3; the cross section of the resistance adjusting box 3 is of a square structure; the split type bin body 2 is a cuboid box body; the split type bin bodies 2 are distributed in turn along the circumferential direction.

The working principle of the invention is as follows:

the primary air powder separated by the coal mill separator enters the Venturi type diffusion section 1, the Venturi structure increases the height-width ratio of the diffusion section, so that the annular inner edge of the inlet is expanded outwards, the coal powder particles are more easily and uniformly diffused in the radial direction of the whole space by changing the speed direction of the inlet, the particle phase distribution deviation on the inlet section of the split type bin body 2 is reduced, and the coal powder quantity distribution deviation among coal powder pipelines is further reduced; the primary air powder output by the Venturi type diffusion section 1 enters each split type bin body 2, a user can adjust the size of an inlet at the bottom of each split type bin body 2 through the powder quantity adjusting baffle 6, the distribution deviation adjustment of the coal powder quantity is realized, the primary air powder output by the split type bin body 2 enters the resistance adjusting box 3, the resistance of air flow is adjusted through adjusting the opening degree of the air quantity adjusting baffle 7, the leveling of the air speed deviation is realized, and the primary air powder output by the resistance adjusting box 3 is discharged through the square-round reducer pipe 4 and the powder outlet pipe 5 in sequence.

The split type storehouse body 2 is the cuboid box that is independent separately, and quantity is the same with the quantity of resistance adjustment case 3 and the quantity of play powder pipe 5, and the entry of the split type storehouse body 2 is the rectangle cross-section, and the export of the split type storehouse body 2 is the square cross-section, and powder quantity adjusting baffle 6 does the adjustment range of split type storehouse body 2 entry area square cross-section's area ~ the area of rectangle cross-section, the design site arrangement of the split type storehouse body 2 is more nimble, and processing, transportation, the installation of the cuboid storehouse body are all easier, and the range of application is wider, and the cost is lower.