CN114923197A

CN114923197A - Pulverized coal adding device of thermal power generation equipment

Info

Publication number: CN114923197A
Application number: CN202210519042.0A
Authority: CN
Inventors: 刘军; 梁德勇; 李立人; 成伟东; 史大明; 曲堂明
Original assignee: Yingkou Power Plant of Huaneng Power International Inc
Current assignee: Yingkou Power Plant of Huaneng Power International Inc
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-08-19

Abstract

The invention discloses a pulverized coal adding device of thermal power generation equipment, which relates to the field of thermal power equipment and comprises a mixing tank, wherein a gas distribution ring is arranged on the outer side of the mixing tank, a plurality of nozzles are arranged on the inner wall of the gas distribution ring, the nozzles are arranged in an upward inclined manner, a connecting pipe is arranged at the bottom of the mixing tank, one end of the connecting pipe is connected with a preheating pipe, and one end of the preheating pipe is provided with a temporary storage tank. According to the invention, the air is delivered to the air distribution ring through the air compressor, the airflow enters the mixing tank through the nozzle in a pulse mode, the compressed airflow spirally rises along the inner wall of the mixing tank, the pulverized coal is impacted by the lifting force, and spirally rises and expands along with the compressed air, the material is downward settled after the compressed air expands to a certain degree, the compressed air enables the pulverized coal to overturn and roll, the mixing effect is better, no stirring unit or blade is worn, and the service life of the device can be effectively prolonged.

Description

Pulverized coal adding device of thermal power generation equipment

Technical Field

The invention relates to the field of thermal power equipment, in particular to a pulverized coal adding device of thermal power generation equipment.

Background

Thermal power generation is a power generation mode that heat energy generated by combustible materials during combustion is converted into electric energy through a power generation device, namely simply, fuel is used for heating water to form high-temperature high-pressure superheated steam, then the steam enters a steam turbine along a pipeline to continuously expand to do work to impact a steam turbine rotor to rotate at a high speed, so that a generator rotor is driven to rotate, and a stator coil cuts magnetic lines of force to generate electric energy.

Chinese patent with publication number CN113685836A discloses a pulverized coal adding device for thermal power generation equipment, including mixing chamber, adding unit, air compressor, furnace body and exhaust unit, the mixing chamber is provided with an accommodation space, including the stand that sets up with the mixing chamber is coaxial, and the stand sets up in the accommodation space. The additive in the device can rotate along with the rotating seat and the air outlet pipe before entering the mixing chamber, so that the effect of quickly and uniformly mixing different additives is achieved, the additive and coal powder can be uniformly mixed when entering the furnace body, and the utilization rate of the additive is improved.

In the above-mentioned technique disclosed, the pulverized coal needs to mix the additive before the burning and guarantees combustion efficiency, and mixing mechanism comprises structures such as hang plate, stirring fan, can reach the effect that the stirring was mixed, but this kind of mechanical rotating part uses for a long time and need carry out maintenance many times, and structures such as axis of rotation need add lubricating oil promptly, and it is comparatively troublesome to maintain cleanness, and it is inconvenient to use.

Disclosure of Invention

Based on this, the invention aims to provide a pulverized coal adding device of thermal power generation equipment, so as to solve the technical problem that the internal mechanism of the common pulverized coal adding device is inconvenient to maintain.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a coal powder of thermal power equipment adds device, includes the blending tank, the outside of blending tank is provided with the branch gas ring, the inner wall that divides the gas ring is provided with a plurality of nozzle, the nozzle is the tilt up setting, the bottom of blending tank is provided with the connecting pipe, the one end of connecting pipe is connected with the preheating pipe, the one end of preheating pipe is provided with the jar of keeping in.

Through adopting above-mentioned technical scheme, compressed gas makes the buggy take place to overturn and rolls, and the mixing effect is better, does not have the wearing and tearing of stirring unit and blade, can effectual improvement device's life.

The invention is further provided with a discharge hole arranged at the bottom of the mixing tank, and a valve is arranged in the discharge hole.

Through adopting above-mentioned technical scheme, open the valve, the buggy gets into in the connecting pipe by the discharge gate.

The invention is further provided that one end of the inner wall of the connecting pipe, which is close to the preheating pipe, is provided with a material throwing plate, and the material throwing plate is arranged in a downward inclination manner.

By adopting the technical scheme, the throwing plate can enable the pulverized coal to be impacted to be bent, and then the pulverized coal is subjected to scattering heat exchange by high-speed airflow in the preheating pipe.

The invention is further provided that the top parts of the mixing tank and the temporary storage tank are provided with filtering mechanisms.

Through adopting above-mentioned technical scheme, gaseous entering blending tank and the jar of keeping in after, can discharge through filtering mechanism filtration rear.

The invention is further provided that the inner diameter of the connecting tube is smaller than the inner diameter of the preheating tube.

By adopting the technical scheme, the flow velocity of the air flow entering the preheating pipe can be increased, the flow velocity is between-m/s, and the pulverized coal can be blown up better.

The invention is further arranged that the inner diameter between the gas inlet end and the gas outlet end of the preheating pipe changes from large to small.

By adopting the technical scheme, the flow velocity of the air flow entering the preheating pipe can be increased, and the pulverized coal blowing effect is better.

The invention is further set up in that the pipe wall of the preheating pipe is provided with a heat transfer cavity, the tank wall of the temporary storage tank is provided with a heat preservation cavity, and the heat transfer cavity is communicated with the heat preservation cavity.

Through adopting above-mentioned technical scheme, can further promote the preheating effect of preheating tube with the jar of keeping in, guarantee that the buggy is in the preheating state, the effect of combustion is better.

The invention is further provided that one end of the preheating pipe is connected with a high-temperature flue gas pipeline of the boiler.

By adopting the technical scheme, high-temperature flue gas can enter the preheating pipe to preheat pulverized coal.

In summary, the invention mainly has the following beneficial effects:

1. according to the invention, the air is conveyed into the air distribution ring through the air compressor, the airflow enters the mixing tank through the nozzle in a pulse mode, the compressed airflow spirally rises along the inner wall of the mixing tank, the pulverized coal is impacted by the lifting force, and spirally rises and expands along with the compressed air, the material is downward settled after the compressed air expands to a certain degree, the compressed air enables the pulverized coal to overturn and roll, the mixing effect is better, no stirring unit or blade is worn, and the service life of the device can be effectively prolonged;

2. after the coal powder and the additive are mixed, the mixture enters a preheating pipe through a connecting pipe to be preheated, the preheating pipe is connected with a boiler flue gas pipeline, high-temperature flue gas enters the preheating pipe, the mixture turns upwards to move along with the flue gas under the impact of high-temperature and high-speed ascending air flow, and the mixture and the flue gas perform sufficient heat exchange in the moving process to complete the preheating work of the coal powder mixture.

Drawings

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

FIG. 2 is a sectional view showing the structural connection between the connection tube and the preheating tube according to the present invention;

FIG. 3 is a cross-sectional view of a mixing tank of the present invention;

FIG. 4 is a top view of the gas distribution ring of the present invention;

FIG. 5 is a graph of the internal airflow movement of the present invention

Fig. 6 is a sectional view showing the internal structure of the dispensing cartridge according to the present invention.

In the figure: 1. a mixing tank; 2. a sealing cover; 3. a feed pipe; 4. a gas distribution ring; 5. an air inlet pipe; 6. a nozzle; 7. a discharge port; 8. a valve; 9. a connecting pipe; 10. a preheating pipe; 11. a temporary storage tank; 12. a material throwing plate; 13. a filtering mechanism; 14. a motor; 15. a material separating barrel; 16. a rotating shaft; 17. a partition plate; 18. a through groove.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

The following describes an embodiment of the present invention based on its overall structure.

A pulverized coal adding device of thermal power generation equipment is disclosed, as shown in figures 1-5, comprising a mixing tank 1, a sealing cover 2 is arranged at the top of the mixing tank 1, a plurality of feeding pipes 3 are arranged at the top of the sealing cover 2, pulverized coal and additives enter the mixing tank 1 through the feeding pipes 3 to be mixed, a gas distribution ring 4 is arranged at the outer side of the mixing tank 1, an air inlet pipe 5 is arranged at one side of the outer wall of the gas distribution ring 4, a plurality of nozzles 6 are arranged on the inner wall of the gas distribution ring 4, the nozzles 6 are arranged in an upward inclined manner, compressed gas sprayed out by an air compressor enters the gas distribution ring 4 through the air inlet pipe 5, the nozzles 6 penetrate into the mixing tank 1, the compressed gas is sprayed into the mixing tank 1 in a pulse manner, the nozzles 6 are arranged in an upward circular array and inclined twenty degrees along the circumferential direction, the arrangement manner can lead the compressed gas sprayed out by the nozzles 6 to spirally rise along the tank wall of the mixing tank 1, the pulverized coal is impacted by the lifting force, the pulverized coal is spirally lifted and expanded along with the compressed gas, the material is downwards settled after the compressed air is expanded to a certain degree, the pulverized coal is overturned and rolled by the compressed gas, the mixing effect is better, the abrasion of a stirring unit and blades is avoided, and the service life of the device can be effectively prolonged;

the bottom of blending tank 1 is provided with connecting pipe 9, the one end of connecting pipe 9 is connected with preheating pipe 10, the one end of preheating pipe 10 is provided with the jar 11 of keeping in, the buggy finishes with the additive mixture back, the mixture preheats in getting into preheating pipe 10 by connecting pipe 9, preheating pipe 10 is connected with boiler flue gas pipeline, high temperature flue gas gets into preheating pipe 10, under the impact of the fast-speed updraft of high temperature, the mixture turns over to upward along with the air current motion, the mixture carries out abundant heat transfer with the flue gas in the motion process, accomplish the preheating work of buggy mixture, buggy after preheating gets into and keeps in jar 11 stores.

Further, please refer to fig. 5-6, a material separating cylinder 15 is arranged at the bottom of the temporary storage tank 11, through grooves 18 are formed in the top and the bottom of the material separating cylinder 15, a motor 14 is installed at one side of the material separating cylinder 15, the output end of the motor 14 is connected with a rotating shaft 16 through a coupler, a plurality of partition plates 17 are arranged on the outer wall of the rotating shaft 16, the rotating shaft 16 and the partition plates 17 rotate along with the rotation of the motor 14, so that pulverized coal falling from the through grooves 18 can be better separated, and the pulverized coal can conveniently enter a subsequent combustion mechanism.

Referring to fig. 1, a discharge port 7 is disposed at the bottom of the mixing tank 1, a valve 8 is disposed inside the discharge port 7, and after the coal powder in the mixing tank 1 is completely mixed, the valve 8 is opened, so that the coal powder can smoothly enter the connecting pipe 9.

Referring to fig. 2, a throwing plate 12 is disposed at an end of the inner wall of the connecting pipe 9 close to the preheating pipe 10, the throwing plate 12 is inclined downward, and the pulverized coal in the connecting pipe 9 impacts the throwing plate 12 before entering the preheating pipe 10, is dispersed and deflected, and is dispersed by the high-speed airflow in the preheating pipe 10 for heat exchange.

Referring to fig. 1, a filtering mechanism 13 is disposed on the top of the mixing tank 1 and the temporary storage tank 11, the gas is filtered by the filtering mechanism 13 and then discharged after entering the mixing tank 1 and the temporary storage tank 11, and the filtering mechanism 13 may be composed of various stages of filtering nets.

Referring to fig. 2, the inner diameter of the connection pipe 9 is smaller than the inner diameter of the preheating pipe 10, and the pulverized coal is blown away by the airflow from the connection pipe 9 into the preheating pipe 10 to perform heat exchange.

Referring to fig. 2, the inside diameter of the preheating pipe 10 from the inlet end to the outlet end is changed from large to small, so that the flow velocity of the air entering the preheating pipe 10 is increased, and the flow velocity is between 16 m/s and 22m/s, so as to better blow the pulverized coal.

Referring to fig. 2, a heat transfer cavity is formed on the wall of the preheating pipe 10, a heat preservation cavity is formed on the wall of the temporary storage tank 11, the heat transfer cavity is communicated with the heat preservation cavity, high-temperature flue gas enters the preheating pipe 10 and also enters the heat transfer cavity, and the heat transfer cavity is connected with the heat preservation cavity of the temporary storage tank 11, so that the preheating effect of the preheating pipe 10 and the temporary storage tank 11 can be further improved, pulverized coal is ensured to be in a preheating state, and the combustion effect is better.

The working principle of the invention is as follows: pulverized coal and an additive enter a mixing tank 1 through a feeding pipe 3 to be mixed, compressed gas sprayed out of an air compressor enters a gas distribution ring 4 through an air inlet pipe 5, a nozzle 6 penetrates into the mixing tank 1, the compressed gas is sprayed into the mixing tank 1 in a pulse mode, the nozzle 6 is inclined twenty degrees along the circumferential direction and arranged in an upward circular array, the compressed gas sprayed out of the nozzle 6 can spirally rise along the tank wall of the mixing tank 1 in the arrangement mode, the pulverized coal is impacted by an ascending force and spirally rises and expands along with the compressed gas, materials are downwards settled after the compressed air expands to a certain degree, and the compressed gas enables the pulverized coal to overturn and roll to be fully mixed;

after the coal powder and the additive are mixed, the mixture enters a preheating pipe 10 through a connecting pipe 9 to be preheated, the preheating pipe 10 is connected with a boiler flue gas pipeline, high-temperature flue gas enters the preheating pipe 10, the mixture turns upwards to move along with the air flow under the impact of high-temperature and high-speed ascending air flow, the mixture and the flue gas perform sufficient heat exchange in the moving process, and the preheating work of the coal powder mixture is completed.

Although embodiments of this invention have been shown and described, it is to be understood that such embodiments are merely illustrative of and not restrictive on the broad invention, and that any one or more of the described features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples, and that modifications, substitutions, and variations that do not materially contribute to the novel teachings of this invention may be made by those skilled in the art after reading this disclosure without departing from the principles and spirit of this invention, but within the scope of the appended claims.

Claims

1. The utility model provides a coal powder of thermal power generation equipment adds device, includes blending tank (1), its characterized in that: the outside of blending tank (1) is provided with and divides gas ring (4), the inner wall that divides gas ring (4) is provided with a plurality of nozzle (6), nozzle (6) are the tilt up setting, the bottom of blending tank (1) is provided with connecting pipe (9), the one end of connecting pipe (9) is connected with preheating pipe (10), the one end of preheating pipe (10) is provided with temporary storage tank (11).

2. The pulverized coal adding device of a thermal power plant according to claim 1, characterized in that: the bottom of blending tank (1) is provided with discharge gate (7), the internally mounted of discharge gate (7) has valve (8).

3. The pulverized coal adding device of a thermal power plant according to claim 1, characterized in that: and a material throwing plate (12) is arranged at one end of the inner wall of the connecting pipe (9) close to the preheating pipe (10), and the material throwing plate (12) is arranged in a downward inclined mode.

4. The pulverized coal adding device of a thermal power plant according to claim 1, characterized in that: and the top parts of the mixing tank (1) and the temporary storage tank (11) are provided with a filtering mechanism (13).

5. The pulverized coal adding device of a thermal power plant according to claim 1, characterized in that: the inner diameter of the connecting pipe (9) is smaller than that of the preheating pipe (10).

6. The pulverized coal adding device of a thermal power plant according to claim 1, characterized in that: the inner diameter of the preheating pipe (10) between the gas inlet end and the gas outlet end changes from large to small.

7. The pulverized coal adding device of a thermal power plant according to claim 1, characterized in that: the pipe wall of the preheating pipe (10) is provided with a heat transfer cavity, the tank wall of the temporary storage tank (11) is provided with a heat preservation cavity, and the heat transfer cavity is communicated with the heat preservation cavity.

8. The pulverized coal adding device of a thermal power plant according to claim 1, characterized in that: one end of the preheating pipe (10) is connected with a high-temperature flue gas pipeline of the boiler.