CN219083154U

CN219083154U - Gas-solid two-phase flow equipartition device for preventing powder accumulation

Info

Publication number: CN219083154U
Application number: CN202222983637.XU
Authority: CN
Inventors: 李建生; 刘松; 刘杰; 齐国杰; 赵洋; 周红波; 马俊; 谢悦; 王洋
Original assignee: Beijing Zhongdian Lianzhong Power Technology Group Co ltd; Liaoning Zhonggong Energy Equipment Co ltd; HULUDAO HUANENG INDUSTRIAL CERAMIC CO LTD
Current assignee: Beijing Zhongdian Lianzhong Power Technology Group Co ltd; Liaoning Zhonggong Energy Equipment Co ltd; HULUDAO HUANENG INDUSTRIAL CERAMIC CO LTD
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-05-26
Anticipated expiration: 2032-11-10

Abstract

The utility model relates to gas-solid two-phase flow distribution equipment, in particular to a gas-solid two-phase flow equally dividing device for preventing powder accumulation. The device comprises a shell, one side of the shell is provided with a water inlet, the other side of the shell is provided with a plurality of water outlet, the water inlet is connected with an inlet reducer pipe, the water outlet is respectively connected with an outlet reducer pipe, the outlet reducer pipe is an eccentric square reducer pipe, the height of the center of the outlet end of the outlet reducer pipe is lower than that of the rectangular center of the inlet end of the outlet reducer pipe, wear-resistant ceramics are inlaid on the inner walls of the shell, the inlet reducer pipe and the outlet reducer pipe, the horizontal height between the shell and the bottom of the inner cavity of the outlet reducer pipe is reduced, or the two are at the same horizontal height, so that coal dust can smoothly pass through without causing accumulated powder, the safety of the device is improved, and the safety and the economical efficiency of a unit are improved.

Description

Gas-solid two-phase flow equipartition device for preventing powder accumulation

Technical Field

The utility model relates to gas-solid two-phase flow distribution equipment, in particular to a gas-solid two-phase flow equally dividing device for preventing powder accumulation.

Background

In the power industry production of China, the main production form is thermal power generation by taking coal as a raw material, and main power equipment of a coal-fired power plant is mainly a coal-fired boiler. The economic operation of pulverized coal boilers greatly influences the benefits of power enterprises and the loss of equipment. The pulverized coal equally dividing device is one of key equipment of a combustion pulverizing system of a thermal power plant, plays a role in reasonably organizing boiler combustion and effectively controlling a temperature field in a furnace, can ensure that the combustion power of each burner is equal and the firing condition is the same, prevents boiler tube explosion caused by slag formation and thermal deviation in the furnace, and avoids blockage or firing of a pulverized coal pipeline.

The supercritical 1000MW grade unit boiler adopts direct-fired pulverizing system in most cases, and usually every coal pulverizer needs to provide primary air for 4 or even 8 burners of a certain burner layer of the boiler, and improvement of uniformity of primary air distribution of the direct-fired pulverizing system is increasingly emphasized. The 8.1 th standard of the power industry standard (DL/T5154-2002) on the design standard and the calculation method of the pulverizing system of the thermal power plant specifies that pulverized coal and air between the primary air pipes of the same-layer burner of the medium-speed mill direct-fired pulverizing system should be uniformly distributed, the air quantity deviation is not more than +/-8 percent, and the pulverized coal deviation is not more than +/-10 percent. If the distribution of the pulverized coal and the air has larger deviation, such as more than +/-15%, the ignition of primary air at the outlet of the burner and the combustion working condition of the whole hearth are affected, so that the problems of flame deflection, steam temperature deviation, tube explosion of the boiler and the like are caused. However, since the outlet transition pipes of the equipartition devices which are horizontally arranged at present are concentric reducer pipes, the horizontal height difference of the bottom is large, the inside is uneven, the coal dust can not be completely conveyed to the burner when the unit is in normal operation or purging, the coal dust is accumulated in the burner, as shown in the marked circled place of fig. 1, the accumulated coal dust accumulation can cause spontaneous combustion and explosion of the coal dust, the safety and stability of equipment are seriously affected, the operation is greatly affected, and meanwhile, the flow speed of primary air flow is high, so that the abrasion problem in the equipartition devices is serious.

Disclosure of Invention

The utility model aims to solve the problems, thereby providing a gas-solid two-phase flow equally dividing device for preventing powder accumulation.

The utility model solves the problems, and adopts the following technical scheme:

the utility model provides a prevent gas-solid two-phase flow equipartition device of long-pending powder, includes the casing, and one side of casing is provided with an inlet, and the opposite side of casing is provided with a plurality of outlet, is connected with the entry reducing pipe on the inlet, is connected with the export reducing pipe on the outlet respectively, and the export reducing pipe is eccentric square circle reducing pipe, and the height at export reducing pipe exit end centre of a circle is less than the height at export reducing pipe entry end rectangular center, all inlays on the inner wall of casing, entry reducing pipe and export reducing pipe has wear-resisting ceramic.

Compared with the prior art, the utility model adopting the technical scheme has the outstanding characteristics that:

the inlet reducer pipe and the inlet pipeline of the device are connected, the outlet reducer pipe is connected with the outlet pipeline, the wear resistance of the device is obviously improved by embedding wear-resistant ceramics on the inner wall, the service life of the device is prolonged, the eccentric reducer pipe is adopted as the outlet reducer pipe, the horizontal height between the shell and the bottom of the inner cavity of the outlet reducer pipe is reduced, or the two are at the same horizontal height, so that coal dust can smoothly pass through, accumulated powder is not caused, the safety of equipment is improved, and the device improves the safety and economical efficiency of a unit.

Preferably, the utility model further adopts the technical scheme that:

an equipartition grid is arranged in the shell and between the inlet and the outlet.

Wear-resistant ceramics are inlaid on the equipartition grids.

The top of casing is provided with the access door.

Drawings

FIG. 1 is a schematic diagram of a structure of a conventional equipartition device that is prone to powder accumulation in the prior art;

FIG. 2 is a schematic diagram of a front view structure of an embodiment of the present utility model;

FIG. 3 is a schematic top view of an embodiment of the present utility model;

marked in the figure as: the device comprises a shell 1, an inlet reducer pipe 2, an outlet reducer pipe 3, wear-resistant ceramics 4, an equipartition grid 5, an access door 6, an inlet pipeline 7 and an outlet pipeline 8.

Detailed Description

The utility model is further described below in connection with the following examples which are provided for the purpose of better understanding of the present utility model and are, therefore, not to be construed as limiting the scope of the utility model.

The utility model provides a gas-solid two-phase flow equipartition device of anti-dust, which comprises a housing 1, one side of housing 1 is provided with an inlet, the opposite side of housing 1 is provided with a plurality of outlet, be connected with inlet reducer 2 on the inlet, be connected with outlet reducer 3 on the outlet respectively, inlet reducer 2 is concentric square reducer, outlet reducer 3 is eccentric square reducer, inlet reducer 2 and outlet reducer 3 link to each other with housing 1's one end be the rectangle, inlet reducer 2 and outlet reducer 3 keep away from housing 1's one end and be circular, inlet reducer 2 keep away from housing 1's one end and link to each other with inlet pipe 7, outlet reducer 3 keep away from housing 1's one end and link to each other with outlet pipe 8, the sum of the flow areas of all outlet pipelines 8 is larger than the flow area of the inlet pipeline 7, the height of the center of the circle of the outlet end of the outlet reducer pipe 3 is lower than the height of the rectangular center of the inlet end of the outlet reducer pipe 3, wear-resistant ceramics 4 are inlaid on the inner walls of the shell 1, the inlet reducer pipe 2 and the outlet reducer pipe 3, when the radius size of the outlet pipeline 8 and the size of the outflow opening are fixed, the eccentric square reducer pipe is used to be compared with the concentric square reducer pipe in the prior art, the eccentric square reducer pipe can reduce the horizontal height difference of the bottom, or the bottoms of the eccentric square reducer pipe and the outlet reducer pipe are at the same horizontal height, so that coal dust can smoothly pass through.

The housing 1 is provided with an equipartition grating 5 between the inlet and the outlet, the equipartition grating 5 is a technology well known to those skilled in the art, and the equipartition grating 5 can divide the pulverized coal airflow into a plurality of slit flows, so that the pulverized coal is evenly distributed to a plurality of outlets, and the more the number of gratings, the more uniform the distribution.

The wear-resistant ceramic 4 is inlaid on the uniform-dividing grille 5, and the wear-resistant ceramic 4 enables the uniform-dividing grille 5 to be more wear-resistant.

The top of the housing 1 is provided with an access door 6.

The circled position in fig. 1 is the position where powder is easy to accumulate by adopting a concentric reducer pipe in the prior art.

The inlet reducer pipe and the inlet pipeline of the device are connected, the outlet reducer pipe is connected with the outlet pipeline, the wear resistance of the device is obviously improved by embedding wear-resistant ceramics on the inner wall, the service life of the device is prolonged, the eccentric reducer pipe is adopted as the outlet reducer pipe, the horizontal height between the shell and the bottom of the inner cavity of the outlet reducer pipe is reduced, or the bottoms of the shell and the outlet reducer pipe are at the same horizontal height, so that coal dust can smoothly pass through the device, accumulated powder is not caused, the safety of equipment is improved, and the device improves the safety and economical efficiency of a unit.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the scope of the claims, but rather to cover all equivalent modifications within the scope of the present utility model as defined by the appended claims.

Claims

1. The utility model provides a prevent gas-solid two-phase flow equipartition device of long-pending powder, includes the casing, and one side of casing is provided with a business turn over mouth, and the opposite side of casing is provided with a plurality of business turn over mouth, is connected with the entry reducing pipe on the business turn over mouth, is connected with the export reducing pipe on the business turn over mouth respectively, its characterized in that: the outlet reducer pipe is an eccentric square reducer pipe, the height of the center of the circle of the outlet end of the outlet reducer pipe is lower than that of the rectangular center of the inlet end of the outlet reducer pipe, and wear-resistant ceramics are inlaid on the inner walls of the shell, the inlet reducer pipe and the outlet reducer pipe.

2. The powder accumulation preventing gas-solid two-phase flow equally dividing device according to claim 1, characterized in that: an equipartition grid is arranged in the shell and between the inlet and the outlet.

3. The powder accumulation preventing gas-solid two-phase flow equally dividing device according to claim 2, characterized in that: wear-resistant ceramics are inlaid on the equipartition grids.

4. The powder accumulation preventing gas-solid two-phase flow equally dividing device according to claim 1, characterized in that: the top of casing is provided with the access door.