CN116839024A - Pulverized coal concentrator, design method thereof and pulverized coal combustion system - Google Patents
Pulverized coal concentrator, design method thereof and pulverized coal combustion system Download PDFInfo
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- CN116839024A CN116839024A CN202310756182.4A CN202310756182A CN116839024A CN 116839024 A CN116839024 A CN 116839024A CN 202310756182 A CN202310756182 A CN 202310756182A CN 116839024 A CN116839024 A CN 116839024A
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- 239000003245 coal Substances 0.000 title claims abstract description 279
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 109
- 239000002817 coal dust Substances 0.000 claims abstract description 20
- 230000008439 repair process Effects 0.000 claims description 65
- 230000007704 transition Effects 0.000 claims description 51
- 239000003381 stabilizer Substances 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000011044 inertial separation Methods 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/12—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated exclusively within the combustion zone
- F23C10/14—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated exclusively within the combustion zone the circulating movement being promoted by inducing differing degrees of fluidisation in different parts of the bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
Abstract
The embodiment of the application provides a pulverized coal concentrator, a design method thereof and a pulverized coal combustion system. The pulverized coal concentrator provided by the embodiment of the application comprises a right-angle bent pipe, a concentrated pulverized coal pipe and a dilute pulverized coal pipe. The inner wall surface of the right-angle elbow comprises a concentrating surface and an elbow surface which are arranged on the outer periphery side of the inner wall surface of the right-angle elbow, and the concentrating surface and the elbow surface define a coal dust channel; the coal powder channel is provided with a coal powder air inlet and a coal powder air outlet which are oppositely arranged in the coal powder conveying direction, and the coal powder air outlet comprises a concentrated coal powder outlet and a light coal powder outlet; the inlet of the concentrated coal powder pipe is connected with the concentrated coal powder outlet; and the outlet of the light coal powder pipe is connected with the light coal powder outlet. According to the pulverized coal provider provided by the embodiment of the application, the concentration surface is arranged on the outer periphery side of the inner wall surface of the right-angle elbow, so that the concentration efficiency of the pulverized coal provider can be greatly improved.
Description
Technical Field
The application belongs to the technical field of pulverized coal combustion equipment, and particularly relates to a pulverized coal burner, a design method thereof and a pulverized coal combustion system.
Background
The flexible peak regulation of the coal motor group is a foundation for solving the problem of increasing renewable energy power consumption and ensuring stable power supply in China. The pulverized coal ground by a coal mill in a power plant directly enters a combustor through pneumatic conveying, the concentration of the pulverized coal is low, the problems of fire difficulty, stable combustion difficulty and burnout difficulty exist under low-load operation of a boiler, the traditional concentration separation combustion method is difficult to meet the requirement of safe and stable operation of the boiler, and the concentration of the pulverized coal in the combustor needs to be further improved.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent.
To this end, embodiments of the present application provide a pulverized coal concentrator.
The pulverized coal concentrator of the embodiment of the application comprises:
the pipe bending device comprises a right-angle pipe, wherein the inner wall surface of the right-angle pipe comprises a concentrating surface and a pipe bending surface which are arranged on the outer periphery side of the inner wall surface of the right-angle pipe; the concentrating surface and the bent pipe surface define a coal dust channel, the coal dust channel is provided with a coal dust air inlet and a coal dust air outlet which are oppositely arranged in the coal dust conveying direction, and the coal dust air outlet comprises a concentrated coal dust outlet and a light coal dust outlet;
the concentrated coal powder pipe is characterized in that the concentrated coal powder pipe inlet of the concentrated coal powder pipe is connected with the concentrated coal powder outlet;
and the concentrated coal powder pipe outlet of the light coal powder pipe is connected with the light coal powder outlet.
In some embodiments, the enrichment surface comprises a return surface extending in the direction of coal fines transport and two transition surfaces;
the reflow surface has first and second reflow side edges opposite to each other in the width direction thereof,
the elbow surface has a first elbow side edge and a second elbow side edge opposite in a width direction thereof,
the two transition surfaces are a first transition surface and a second transition surface respectively;
the inner side edge of the first transition surface is tangentially connected with the first bent pipe side edge of the bent pipe surface, and the outer side edge of the first transition surface is connected with the first backflow side edge of the backflow surface;
the inner side edge of the second transition surface is tangentially connected with the second bent pipe side edge of the bent pipe surface, and the outer side edge of the second transition surface is connected with the second backflow side edge of the backflow surface.
In some embodiments, the reflow surface includes a first repair surface, a second repair surface, and a third repair surface that are sequentially tangentially connected;
the first repair surface and the second repair surface are both revolution surfaces; the third repair surface is a plane;
the diameter of the bent pipe surface is D, and the radius of the inner periphery of the bent pipe surface is month c;
a first radius of gyration R of the first repair face 1 Satisfy R 1 ＞R c +D；
A second radius of gyration R of the second repair face 2 Satisfy the following requirements
The distance H from the end point of the third repair surface to the outer periphery of the inner wall surface of the right-angle bent pipe is more than or equal to 0.01D and less than or equal to 0.1D.
In some embodiments, the first repair face has a first angle of revolution α 1 Satisfy the following requirements
In some embodiments, the second angle of revolution α of the second repair face 2 Meets the alpha of 90 degrees or less 2 ≤140°。
In some embodiments, the width W of the return surface satisfies 0.1 D.ltoreq.W.ltoreq.0.2D.
In some embodiments, the angle B between the first transition surface and the second transition surface satisfies
The application also provides a design method of the pulverized coal concentrator, wherein the pulverized coal concentrator is the pulverized coal concentrator in the embodiment, and the design method of the pulverized coal concentrator comprises the following steps:
step S100: obtaining the pipe inner diameter D of the right-angle elbow pipe and the radius R of the inner periphery of the inner wall surface of the right-angle elbow pipe c ；
Step S200: the pipe inner diameter D of the right-angle elbow pipe and the radius E of the inner peripheral edge of the inner wall surface of the right-angle elbow pipe determined in the step S100 c Determining relevant parameters of a reflow surface;
step S300: the pipe inner diameter D of the right-angle elbow and the radius R of the inner periphery of the inner wall surface of the right-angle elbow determined according to the step S100 c Relevant parameters of the transition surface are determined.
Step S400: and judging whether the coal powder concentration and the coal powder flow of the concentrated coal powder outlet reach preset standards or not, and if the coal powder concentration and the coal powder flow of the concentrated coal powder outlet do not reach the preset standards, returning to the step S200 and the step S300 to redetermine the relevant parameters of the concentrating surface and the transition surface.
In some embodiments, the determining the relevant parameters of the reflow surface in step S200 includes the following steps:
step S210: the pipe inner diameter D of the right-angle elbow obtained in the step S100 and the radius R of the inner periphery of the inner wall surface of the right-angle elbow c Determining a first radius of gyration R of a first repair face 1 And a first rotation angle alpha 1 Ensuring that the end point of the first repair face is located outside the outer periphery of the inner wall surface of the right-angle elbow;
step S220: the pipe inner diameter D of the right-angle elbow pipe obtained according to the step S100Radius R of inner peripheral edge of inner wall surface c And the first radius R of gyration of the first repair face determined in step S200 1 Determining a second radius of gyration R of the second repair face 2 And a second rotation angle alpha 2 ；
Step 230: and determining the distance H from the end point of the third repair face to the outer periphery of the inner wall surface of the right-angle elbow according to the pipe inner diameter D of the right-angle elbow obtained in the step S100.
Step 240: determining the height of the concentrated coal powder outlet according to the distance H from the end point of the third repairing surface to the outer periphery of the inner wall surface of the right-angle elbow pipe, which is determined in the step S230, and determining whether the height of the concentrated coal powder outlet is within a preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the length of the third repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the second rotation angle of the modified second repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the first rotation angle of the first repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, and if the height of the concentrated coal powder outlet is not within the preset range, modifying the first rotation radius of the first repairing surface.
In some embodiments, determining the relevant parameters of the transition surface in the step S300 includes the following steps:
step S310: determining the width W of the reflux surface according to the pipe inner diameter D of the right-angle bent pipe obtained in the step S100;
step S320: and determining an included angle B between the two transition surfaces according to the pipe inner diameter D of the right-angle bent pipe obtained in the step S100 and the width W of the reflux surface determined in the step S310.
The embodiment of the application also provides a pulverized coal combustion system, which comprises:
a fan, wherein the fan is arranged on the air inlet,
the coal mill is provided with a raw coal inlet, a primary air inlet of the coal mill is connected with a primary air outlet of the fan,
the pulverized coal concentrator of the embodiment, wherein a pulverized coal air inlet of the pulverized coal concentrator is connected with a pulverized coal air outlet of the coal mill;
a combustion stabilizer, wherein a combustion stabilizing inlet of the combustion stabilizer is connected with a concentrated coal powder pipe outlet of the coal powder concentrator,
and the combustion inlet of the burner is connected with the outlet of the light coal powder pipe of the coal powder concentrator.
In some embodiments, the pulverized coal combustion system according to the embodiments of the present application further comprises a venturi conveyor having a powder inlet connected to the concentrated pulverized coal pipe outlet of the concentrated pulverized coal pipe, an air inlet connected to the combustion stabilizing inlet of the combustion stabilizer, and an air outlet.
Drawings
FIG. 1 is a schematic diagram of a pulverized coal concentrator according to an embodiment of the present application;
FIG. 2 is a cross-sectional view of a right angle elbow of the pulverized coal concentrator of an embodiment of the present application in the direction A-A of FIG. 1;
FIG. 3 is a cross-sectional view of a right angle elbow of the pulverized coal concentrator of an embodiment of the present application in the direction B-B of FIG. 2;
FIG. 4 is a schematic diagram of a pulverized coal combustion system according to an embodiment of the application;
FIG. 5 is a flow chart of a method of designing a pulverized coal concentrator in accordance with an embodiment of the present application;
FIG. 6 is a flow chart of step S200 in a method of designing a pulverized coal concentrator according to an embodiment of the present application;
fig. 7 is a flowchart of step S300 in the design method of the pulverized coal concentrator according to the embodiment of the present application.
Reference numerals:
100. a coal powder concentrator; 200. a pulverized coal combustion system;
1. a right-angle elbow;
101. concentrating the flour; 1011. a reflow surface; 10111. a first repair face; 10112. a second repair face; 10113. a third repair face;
10114. a first reflow side edge; 10115. a second reflow side edge;
1012. a transition surface; 10121. a first transition surface; 10122. a second transition surface;
102. a bent pipe surface; 1021. a first elbow side edge; 1022. a second elbow side edge;
103. a coal dust channel; 104. a coal dust air inlet; 105. a pulverized coal air outlet; 1051. a concentrated coal powder outlet; 1052. a lean coal powder outlet;
2. a concentrated coal powder pipe; 201. an inlet of the concentrated coal powder pipe; 202. a concentrated coal powder pipe outlet;
3. a light coal powder pipe; 301. a lean coal powder pipe inlet; 302. a light coal powder pipe outlet;
4. a blower; 401. a primary air outlet;
5. a coal mill; 501. a primary air inlet; 502. a raw coal inlet;
6. a flame stabilizer; 601. a stable combustion inlet;
7. a burner; 701. a combustion inlet;
8. a venturi conveyor; 801. an air inlet; 802. an air outlet; 803. a powder inlet.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
A coal powder concentrator 100 according to an embodiment of the present application is described below with reference to fig. 1-3.
The pulverized coal concentrator 100 of the embodiment of the application comprises a right-angle bent pipe 1, a concentrated pulverized coal pipe and a dilute pulverized coal pipe.
The inner wall surface of the right-angle elbow 1 comprises a concentrating surface 101 and an elbow surface 102 which are arranged on the outer periphery side of the inner wall surface of the right-angle elbow 1, and the concentrating surface 101 and the elbow surface 102 define a coal dust channel 103;
the pulverized coal channel 103 has a pulverized coal air inlet 104 and a pulverized coal air outlet 105 which are oppositely arranged in the pulverized coal conveying direction, and the pulverized coal air outlet 105 includes a concentrated pulverized coal outlet 1051 and a dilute pulverized coal outlet 1052;
the concentrated coal powder pipe, the concentrated coal powder pipe inlet 201 of the concentrated coal powder pipe is connected with the concentrated coal powder outlet 1051;
the inlet 301 of the light coal powder pipe is connected with the outlet 1052.
It will be appreciated that the right angle bend 1 in the present application is a 90 ° bend, i.e. the inlet and outlet directions of the right angle bend 1 in the present application are perpendicular to each other.
It can be further appreciated that the centre of the bend of the right-angle elbow 1
As shown in fig. 2, the outer periphery of the inner wall surface of the elbow bend 1 is the outermost periphery of the inner wall surface of the elbow bend 1, in other words, the distance between the outer periphery of the inner wall surface of the elbow bend 1 and the bending center of the elbow bend 1 is the largest;
the inner periphery of the inner wall surface of the elbow bend 1 is the innermost inner periphery of the inner wall surface of the elbow bend 1, in other words, the distance between the inner periphery of the inner wall surface of the elbow bend 1 and the bending center of the elbow bend 1 is the smallest.
According to the pulverized coal concentrator 100 provided by the embodiment of the application, the shape of the outer peripheral side of the inner wall surface of the right-angle elbow pipe 1 is changed on the basis of the right-angle elbow pipe 1, namely, the concentrating surface 101 for concentrating pulverized coal is arranged on the outer peripheral side of the inner peripheral wall of the right-angle elbow pipe 1, the concentrating surface 101 can form a rotary inertial separation zone in the right-angle elbow pipe 1, so that pulverized coal can be concentrated in the rotary inertial separation zone, meanwhile, a concentrated pulverized coal outlet 1051 is formed in the region of the pulverized coal air outlet 105 adjacent to the concentrating surface 101, and the concentrated pulverized coal in the rotary inertial separation zone flows into a concentrated pulverized coal pipe from the concentrated pulverized coal outlet 1051 under the guidance of the concentrating surface 101, so that the pulverized coal concentrating effect is achieved.
According to the pulverized coal concentrator 100 provided by the embodiment of the application, by arranging the concentrating surface 101, pulverized coal wind entering the right-angle elbow pipe 1 can be split into concentrated pulverized coal wind with high pulverized coal concentration and dilute pulverized coal wind with low concentration, the concentrated pulverized coal wind enters the concentrated pulverized coal pipe through the concentrated pulverized coal outlet 1051, and the dilute pulverized coal wind enters the dilute pulverized coal pipe through the dilute pulverized coal outlet 1052, so that the concentrating effect is achieved.
In some embodiments, the enrichment surface 101 includes a return surface 1011 and two transition surfaces 1012 extending in the pulverized coal transport direction;
the reflow surface 1011 has a first reflow side edge 10114 and a second reflow side edge 10115 opposite in the width direction thereof,
the elbow surface 102 has first and second elbow side edges 1021 and 1022 opposite in the width direction thereof,
the two transition surfaces 1012 are a first transition surface 10121 and a second transition surface 10122, respectively;
the inner side edge of the first transition surface 10121 is tangentially connected with the first bent pipe side edge 1021 of the bent pipe surface 102, and the outer side edge of the first transition surface 10121 is connected with the first return side edge 10114 of the return surface 1011;
the inner edge of the second transition surface 10122 is tangentially connected to the second elbow side edge 1022 of the elbow surface 102, and the outer edge of the second transition surface 10122 is connected to the second return side edge 10115 of the return surface 1011.
In some embodiments, the reflow face 1011 includes a first, second, and third repair face 10111, 10112, 10113 that are sequentially tangentially connected;
in other words, the end point of the first repair face 10111 is tangential to the start point of the second repair face 10112, and the end point of the second repair face 10112 is tangential to the start point of the third repair face 10113.
It can be appreciated that by making the end point of the first repair surface 10111 tangential to the start point of the second repair surface 10112 and the end point of the second repair surface 10112 tangential to the start point of the third repair surface 10113, the pulverized coal wind can flow more smoothly in the pulverized coal channel 103, and the occurrence of some unnecessary turbulence is avoided to affect the concentration process of the pulverized coal in the pulverized coal channel 103.
Optionally, the start point of the first repair face 10111 is tangential to the pulverized coal wind inlet 104, and the end point of the third repair face 10113 is tangential to the pulverized coal wind outlet 105.
It can be appreciated that by making the start point of the first repair face 10111 tangential to the pulverized coal air inlet 104 and the end point of the third repair face 10113 tangential to the pulverized coal air outlet 105, the pulverized coal air is smoother when entering the pulverized coal channel 103 and flowing out of the pulverized coal channel 103, and some unnecessary turbulence is not generated to influence the concentration process of the pulverized coal in the pulverized coal channel 103.
As shown in fig. 2, the first and second repair faces 10111, 10112 are both surfaces of revolution; the third repair face 10113 is planar;
further, the revolution sections of the first and second repair faces 10111 and 10112 are straight lines.
The diameter of the bent pipe surface is D, and the radius of the inner periphery of the bent pipe surface is month c;
it will be appreciated that the diameter D of the elbow face is the inside diameter of the tube of the right angle elbow.
First radius of gyration R of first repair face 1 Satisfy R 1 ＞R c +D；
Second radius of gyration R of the second repair face 2 Satisfy the following requirements
The distance H from the end point of the third repair surface to the outer periphery of the inner wall surface of the right-angle bent pipe is more than or equal to 1.01D and less than or equal to 1.1D.
It can be appreciated that the pulverized coal concentrator 100 of the embodiment of the present application is manufactured by causing the first radius of gyration R of the first repair face 10111 to 1 Satisfy R 1 ＞R c +d, i.e. such that the end point of the first repair face 10111 is always located outside the outer periphery of the inner wall face of the right angle bend 1, thereby providing a basis for the subsequent enrichment face 101 to form a larger rotational inertia separation zone.
The pulverized coal concentrator 100 of the embodiment of the present application is manufactured by making the second radius of gyration R of the second repair face 10112 2 Satisfy the following requirementsI.e. R 2 ＜R 1 . It can be appreciated that according to the reflux separation principle, the smaller the radius of gyration, the greater the tangential velocity of the pulverized coal particles, and thus the more the pulverized coal particles are enriched toward the outer wall due to the inertial effect.
Thus, by making R 2 ＜R 1 More pulverized coal particles can be enriched at the second repair face 10112, and the concentrating efficiency of the pulverized coal concentrator 100 of the embodiment of the application is further improved.
It can be appreciated that, by disposing the pulverized coal concentrator 100 in the second repair face 10112, the inertial separation region can be further extended, so that the area of the inertial separation region is further increased, and the concentrating efficiency of the pulverized coal concentrator 100 in the embodiment of the present application is further improved. When H is too high, the concentration of coal powder entering the concentrated coal powder pipe can be reduced, and when H is too low, the amount of coal powder entering the concentrated coal powder pipe can be reduced, and meanwhile, the pressure drop of the concentrated coal powder pipe can be increased.
According to the pulverized coal concentrator 100 provided by the embodiment of the application, the distance H from the end point of the third repair surface to the outer periphery of the inner wall surface of the right-angle elbow pipe is enabled to be more than or equal to 0.01D and less than or equal to 0.1D, so that the pulverized coal quantity entering the pulverized coal pipe can be improved on the basis of not reducing the concentration of pulverized coal entering the pulverized coal pipe, and the pressure drop of the pulverized coal pipe is also reduced.
In some embodiments, the first angle of revolution α of the first repair face 1 Satisfy the following requirementsSecond angle of rotation alpha of second repair face 2 Meets the alpha of 90 degrees or less 2 ≤140°。
It can be appreciated that the larger the turning angle, the longer the pulverized coal particles in the pulverized coal wind and the time of inertial separation of the airflow can enrich more particles into the inertial turning separation region near the first and second repair faces 10111 and 10112.
In some embodiments, the width W of the return surface satisfies 0.1 D.ltoreq.W.ltoreq.0.2D.
In some embodiments, the angle B between the first transition surface and the second transition surface satisfies
As shown in fig. 3, the distance between the first transition surface 10121 and the second transition surface 10122 in the width direction of the return surface 1011 gradually decreases along the direction approaching the return surface 1011, that is, the distance between the first transition surface 10121 and the second transition surface 10122 gradually decreases to the return surface 1011, and further the contraction zone is defined between the first transition surface 10121, the second transition surface 10122 and the return surface 1011, so that the pulverized coal area near the curved pipe surface 102 is further enriched toward the return surface 1011, and the concentration efficiency of the pulverized coal concentrator 100 in the embodiment of the present application is further improved.
The embodiment of the application also provides a design method of the pulverized coal concentrator 100.
The pulverized coal concentrator 100 in the method for designing a pulverized coal concentrator 100 according to the embodiment of the present application is the pulverized coal concentrator 100 described in the above embodiment, and meanwhile, as shown in fig. 5, the method for designing a pulverized coal concentrator 100 according to the embodiment of the present application includes the following steps:
step S100: obtaining the pipe inner diameter D of the right-angle elbow pipe and the radius R of the inner periphery of the inner wall surface of the right-angle elbow pipe c ；
Step S200: the pipe inner diameter D of the right-angle elbow and the radius R of the inner periphery of the inner wall surface of the right-angle elbow determined according to the step S100 c Determining relevant parameters of a reflow surface;
step S300: the pipe inner diameter D of the right-angle elbow and the radius R of the inner periphery of the inner wall surface of the right-angle elbow determined according to the step S100 c Relevant parameters of the transition surface are determined.
Step S400: and judging whether the coal powder concentration and the coal powder flow of the concentrated coal powder outlet reach preset standards or not, and if the coal powder concentration and the coal powder flow of the concentrated coal powder outlet do not reach the preset standards, returning to the step S200 and the step S300 to redetermine the relevant parameters of the concentrating surface and the transition surface.
In some embodiments, as shown in fig. 6, the determining the relevant parameters of the reflow surface in step S200 includes the following steps:
step S210: the pipe inner diameter D of the right-angle elbow obtained in the step S100 and the radius R of the inner periphery of the inner wall surface of the right-angle elbow c Determining a first radius of gyration R of a first repair face 1 And a first rotation angle alpha 1 Ensuring that the end point of the first repair face is located outside the outer periphery of the inner wall surface of the right-angle elbow;
step S220: the pipe inner diameter D of the right-angle elbow pipe obtained according to the step S100Radius R of inner peripheral edge of inner wall surface c And the first radius R of gyration of the first repair face determined in step S200 1 Determining a second radius of gyration R of the second repair face 2 And a second rotation angle alpha 2 ；
Step 230: and determining the distance H from the end point of the third repair face to the outer periphery of the inner wall surface of the right-angle elbow according to the pipe inner diameter D of the right-angle elbow obtained in the step S100.
Step 240: determining the height of the concentrated coal powder outlet according to the distance H from the end point of the third repairing surface to the outer periphery of the inner wall surface of the right-angle elbow pipe, which is determined in the step S230, and determining whether the height of the concentrated coal powder outlet is within a preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the length of the third repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the second rotation angle of the modified second repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the first rotation angle of the first repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, and if the height of the concentrated coal powder outlet is not within the preset range, modifying the first rotation radius of the first repairing surface.
In some embodiments, as shown in fig. 7, the determining the relevant parameters of the transition surface in step S300 includes the following steps:
step S310: determining the width W of the reflux surface according to the pipe inner diameter D of the right-angle bent pipe obtained in the step S100;
step S320: and determining an included angle B between the two transition surfaces according to the pipe inner diameter D of the right-angle bent pipe obtained in the step S100 and the width W of the reflux surface determined in the step S310.
The embodiment of the application also provides a pulverized coal combustion system 200.
As shown in fig. 4, the pulverized coal combustion system 200 according to the embodiment of the present application includes a fan 4, a coal mill 5, the concentrator, a stabilizer 6, and a burner 7 described in the above embodiments. The coal mill 5 is provided with a raw coal inlet 502, a primary air inlet 501 of the coal mill 5 is connected with a primary air outlet 401 of the fan 4, and a pulverized coal air inlet 104 of the pulverized coal concentrator 100 is connected with a pulverized coal air outlet 105 of the coal mill 5;
the steady combustion inlet 601 of the steady burner 6 is connected with the concentrated coal powder pipe outlet 202 of the coal powder concentrator 100,
the combustion inlet 701 of the burner 7 is connected to the lean coal pipe outlet 302 of the coal powder concentrator 100.
According to the pulverized coal combustion system 200 provided by the embodiment of the application, the pulverized coal concentrator 100 with the concentrating surface 101 is arranged, so that the concentration of pulverized coal and the pulverized coal strength of pulverized coal entering a concentrated pulverized coal pipe can be greatly improved, and further the concentration of pulverized coal and the pulverized coal strength of pulverized coal entering the burner 6 can be improved, and the burner 6 can provide stable combustion flame for the burner 7 in a low-load running state of the boiler, so that the problems of fire difficulty, stable combustion difficulty and burnout difficulty of the boiler in the low-load state are avoided.
Thus, the pulverized coal combustion system 200 according to the embodiment of the application can greatly improve the stability of the pulverized coal combustion system 200 according to the embodiment of the application by providing the pulverized coal concentrator 100 with the concentrating surface 101.
In some embodiments, the pulverized coal combustion system 200 of the embodiment of the application further comprises a venturi conveyor 8, wherein the venturi conveyor 8 is provided with a powder inlet 803, an air inlet 801 and an air outlet 802, the powder inlet 803 is connected with the concentrated pulverized coal pipe outlet 202, and the air outlet 802 is connected with the stable combustion inlet 601 of the stable combustion device 6.
It will be appreciated that the air inlet 801 may be connected to a source of high pressure air, such as a fan 4, to provide pneumatic power to the venturi conveyor 8.
Further, the powder inlet 803 is disposed on a pipeline communicating the air inlet 801 and the air outlet 802, so that the high-pressure air flow provided by the high-pressure air source is sent by the venturi conveyor 8 entering from the air inlet 801, and negative pressure is generated at the powder inlet 803 in the process of flowing out from the air outlet 802, thereby sucking the pulverized coal in the concentrated pulverized coal pipe.
According to the pulverized coal combustion system 200 provided by the embodiment of the application, the venturi conveyor 8 is arranged between the pulverized coal concentrator 100 and the steady burner 6, the venturi conveyor 8 can suck pulverized coal and air in a concentrated pulverized coal pipe into the steady burner 6 and boost pulverized coal wind formed by the pulverized coal and the air, and meanwhile, the venturi conveyor 8 is provided with a stable high-pressure air source, so that the pulverized coal wind can be ensured to be stably introduced into the steady burner 6.
Thus, the pulverized coal combustion system 200 according to the embodiment of the application further improves the stability of the pulverized coal combustion system 200 according to the embodiment of the application by providing the venturi conveyor 8 between the pulverized coal concentrator 100 and the stabilizer 6.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (12)
1. A coal powder concentrator, characterized by comprising
The pipe bending device comprises a right-angle pipe, wherein the inner wall surface of the right-angle pipe comprises a concentrating surface and a pipe bending surface which are arranged on the outer periphery side of the inner wall surface of the right-angle pipe; the concentrating surface and the bent pipe surface define a coal dust channel, the coal dust channel is provided with a coal dust air inlet and a coal dust air outlet which are oppositely arranged in the coal dust conveying direction, and the coal dust air outlet comprises a concentrated coal dust outlet and a light coal dust outlet;
the concentrated coal powder pipe is characterized in that the concentrated coal powder pipe inlet of the concentrated coal powder pipe is connected with the concentrated coal powder outlet;
and the concentrated coal powder pipe outlet of the light coal powder pipe is connected with the light coal powder outlet.
2. The pulverized coal concentrator as claimed in claim 1, wherein the concentrating surface comprises a return surface extending in the pulverized coal conveying direction and two transition surfaces;
the reflow surface has first and second reflow side edges opposite to each other in the width direction thereof,
the elbow surface has a first elbow side edge and a second elbow side edge opposite in a width direction thereof,
the two transition surfaces are a first transition surface and a second transition surface respectively;
the inner side edge of the first transition surface is tangentially connected with the first bent pipe side edge of the bent pipe surface, and the outer side edge of the first transition surface is connected with the first backflow side edge of the backflow surface;
the inner side edge of the second transition surface is tangentially connected with the second bent pipe side edge of the bent pipe surface, and the outer side edge of the second transition surface is connected with the second backflow side edge of the backflow surface.
3. The pulverized coal concentrator of claim 2, wherein the return face comprises a first, a second and a third modified face tangentially connected in sequence;
the first repair surface and the second repair surface are both revolution surfaces; the third repair surface is a plane;
the diameter of the bent pipe surface is D,the radius of the inner periphery of the bent pipe surface is R c ；
A first radius of gyration R of the first repair face 1 Satisfy R 1 >R c +D；
A second radius of gyration R of the second repair face 2 Satisfy the following requirements
The distance H from the end point of the third repair surface to the outer periphery of the inner wall surface of the right-angle bent pipe is more than or equal to 0.01D and less than or equal to 0.1D.
4. A pulverized coal concentrator according to claim 3, characterized in that the first angle of revolution α of the first repair face 1 Satisfy the following requirements
5. A pulverized coal concentrator according to claim 3, characterized in that the second angle of revolution α of the second repair face 2 Meets the alpha of 90 degrees or less 2 ≤140°。
6. A coal fines concentrator as claimed in claim 3, wherein the width W of the return surface is 0.1D. Ltoreq.w.ltoreq.0.2D.
7. A pulverized coal concentrator according to claim 3, characterized in that the angle V between the first transition surface and the second transition surface satisfies
8. A method of designing a pulverized coal concentrator, characterized in that the pulverized coal concentrator is a pulverized coal concentrator as claimed in any one of claims 1 to 7, comprising the steps of:
step S100: obtaining the pipe inner diameter D of the right-angle elbow pipe and the radius R of the inner periphery of the inner wall surface of the right-angle elbow pipe c ；
Step S200: the pipe inner diameter D of the right-angle elbow and the radius R of the inner periphery of the inner wall surface of the right-angle elbow determined according to the step S100 c Determining relevant parameters of a reflow surface;
step S300: the pipe inner diameter D of the right-angle elbow and the radius R of the inner periphery of the inner wall surface of the right-angle elbow determined according to the step S100 c Determining relevant parameters of the transition surface;
step S400: and judging whether the coal powder concentration and the coal powder flow of the concentrated coal powder outlet reach preset standards or not, and if the coal powder concentration and the coal powder flow of the concentrated coal powder outlet do not reach the preset standards, returning to the step S200 and the step S300 to redetermine the relevant parameters of the concentrating surface and the transition surface.
9. The method for designing a pulverized coal concentrator according to claim 8, wherein determining the relevant parameters of the reflow surface in step S200 includes the steps of:
step S210: the pipe inner diameter D of the right-angle elbow obtained in the step S100 and the radius R of the inner periphery of the inner wall surface of the right-angle elbow c Determining a first radius of gyration R of a first repair face 1 And a first rotation angle alpha 1 Ensuring that the end point of the first repair face is located outside the outer periphery of the inner wall surface of the right-angle elbow;
step S220: the pipe inner diameter D of the right-angle elbow obtained in the step S100 and the radius R of the inner periphery of the inner wall surface of the right-angle elbow c And the first radius R of gyration of the first repair face determined in step S200 1 Determining a second radius of gyration R of the second repair face 2 And a second rotation angle alpha 2 ；
Step 230: determining the distance H from the end point of the third repair face to the outer periphery of the inner wall surface of the right-angle elbow according to the pipe inner diameter D of the right-angle elbow obtained in the step S100;
step 240: determining the height of the concentrated coal powder outlet according to the distance H from the end point of the third repairing surface to the outer periphery of the inner wall surface of the right-angle elbow pipe, which is determined in the step S230, and determining whether the height of the concentrated coal powder outlet is within a preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the length of the third repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the second rotation angle of the modified second repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, if the height of the concentrated coal powder outlet is not within the preset range, modifying the first rotation angle of the first repairing surface, and determining whether the height of the concentrated coal powder outlet is within the preset range, and if the height of the concentrated coal powder outlet is not within the preset range, modifying the first rotation radius of the first repairing surface.
10. The method of designing a pulverized coal concentrator according to claim 8, wherein determining the relevant parameters of the transition surface in step S300 includes the steps of:
step S310: determining the width W of the reflux surface according to the pipe inner diameter D of the right-angle bent pipe obtained in the step S100;
step S320: and determining an included angle V between the two transition surfaces according to the pipe inner diameter D of the right-angle bent pipe obtained in the step S100 and the width W of the reflux surface determined in the step S310.
11. A pulverized coal combustion system, comprising:
a fan, wherein the fan is arranged on the air inlet,
the coal mill is provided with a raw coal inlet, a primary air inlet of the coal mill is connected with a primary air outlet of the fan,
the coal fines concentrator as claimed in any one of claims 1 to 7, wherein a coal fines wind inlet of the coal fines concentrator is connected to a coal fines wind outlet of the coal mill;
a combustion stabilizer, wherein a combustion stabilizing inlet of the combustion stabilizer is connected with a concentrated coal powder pipe outlet of the coal powder concentrator,
and the combustion inlet of the burner is connected with the outlet of the light coal powder pipe of the coal powder concentrator.
12. The pulverized coal combustion system as set forth in claim 11 further comprising a venturi conveyor having a powder inlet connected to the concentrated pulverized coal pipe outlet of the concentrated pulverized coal pipe, an air inlet, and an air outlet connected to the steady burning inlet of the steady burner.
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| CN202310756182.4A CN116839024B (en) | 2023-06-25 | 2023-06-25 | Pulverized coal concentrator, design method thereof and pulverized coal combustion system |
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| CN202310756182.4A CN116839024B (en) | 2023-06-25 | 2023-06-25 | Pulverized coal concentrator, design method thereof and pulverized coal combustion system |
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| CN116085790A (en) * | 2022-12-30 | 2023-05-09 | 北京天地融创科技股份有限公司 | Adjustable shade separator |
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| CN2105610U (en) * | 1991-07-05 | 1992-05-27 | 清华大学 | Coal powder sorting flow and burning device |
| JP2016109349A (en) * | 2014-12-05 | 2016-06-20 | 三菱日立パワーシステムズ株式会社 | Solid fuel burner and boiler including solid fuel burner |
| EP3819540A1 (en) * | 2019-11-06 | 2021-05-12 | AC Boilers S.p.A. | Burner assembly, method for said burner assembly and plant comprising said burner assembly |
| CN113757644A (en) * | 2021-08-11 | 2021-12-07 | 山东英电环保科技有限公司 | Combined type combustion stabilizer with controllable concentration and separated coal powder concentration and dilution |
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| CN116839024B (en) | 2024-05-07 |
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