CN111237796A - High-efficient buggy concentrator of low energy consumption - Google Patents
High-efficient buggy concentrator of low energy consumption Download PDFInfo
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- CN111237796A CN111237796A CN202010126986.2A CN202010126986A CN111237796A CN 111237796 A CN111237796 A CN 111237796A CN 202010126986 A CN202010126986 A CN 202010126986A CN 111237796 A CN111237796 A CN 111237796A
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- 238000005265 energy consumption Methods 0.000 title claims abstract description 31
- 239000003245 coal Substances 0.000 claims abstract description 301
- 239000000843 powder Substances 0.000 claims abstract description 97
- 238000005192 partition Methods 0.000 claims abstract description 31
- 238000004891 communication Methods 0.000 claims description 2
- 239000003034 coal gas Substances 0.000 claims 3
- 239000002817 coal dust Substances 0.000 abstract description 57
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 239000012141 concentrate Substances 0.000 abstract description 2
- 238000011044 inertial separation Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- 239000002245 particle Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003116 impacting effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/30—Separating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/008—Feeding devices for pulverulent fuel
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Abstract
A low-energy-consumption high-efficiency pulverized coal concentrator relates to the field of boiler pulverized coal combustion auxiliary devices. The upper end of the first-stage pulverized coal concentrating chamber is an inlet of pulverized coal airflow, a first-stage partition plate is arranged at an outlet at the lower end of the first-stage pulverized coal concentrating chamber, the outlet end of the first-stage pulverized coal concentrating chamber is divided into a first-stage light pulverized coal airflow channel and a first-stage thick pulverized coal airflow channel, and the first-stage thick pulverized coal airflow channel is communicated with the second-stage pulverized coal concentrating chamber after passing through a divergent channel; the outlet at the lower end of the second-stage coal dust concentrating chamber is divided into a second-stage light coal dust airflow channel and a second-stage thick coal dust airflow channel by a second-stage partition plate; the lower end of the primary light pulverized coal airflow channel is communicated with the secondary light pulverized coal airflow channel to form a light pulverized coal airflow mixing channel, and the light pulverized coal airflow mixing channel is communicated with the rotational flow pulverized coal concentration chamber; the third-stage concentrated coal powder airflow channel is connected and communicated with the second-stage concentrated coal powder airflow channel; the dense coal powder air flow mixing channel is positioned at the joint of the third-level dense coal powder air flow channel and the second-level dense coal powder air flow channel. The device concentrates the coal dust and mainly uses inertial separation, so that the overall energy consumption is low, and the device has the advantages of high concentration efficiency, low energy consumption and compact structure.
Description
Technical Field
The invention relates to the field of boiler pulverized coal combustion auxiliary devices, in particular to a low-energy-consumption high-efficiency pulverized coal concentrator.
Background
Coal is the main fossil fuel in China, and Nitrogen Oxides (NO) generated by coal combustion x ) Is a precursor for acid rain and photochemical pollution, while coal burning in coal fired boilers produces NO x Is the main source of (1). The coal powder concentration technology is to reduce NO in the coal combustion process x The formation of the coal dust, and simultaneously promoting the ignition and stable combustion of the coal dust. The concentration of the pulverized coal is greatly improved by concentrating the pulverized coal airflow, so that on one hand, the ignition heat of the pulverized coal airflow is reduced, the timely ignition and stable combustion of the pulverized coal are promoted, on the other hand, the pulverized coal is combusted always under the strong reducing gas in the initial combustion stage, and the fuel type NO in the pulverized coal combustion process is greatly inhibited x And (4) generating.
The coal dust concentrator is an important device for concentrating coal dust airflow. Conventional coal powder concentrators include cyclone coal powder concentrators, shutter coal powder concentrators and elbow coal powder concentrators. In the cyclone cylinder coal powder concentrator, coal powder airflow enters the concentrator along the tangential direction, the coal powder airflow rotates at a high speed in the concentrator, and coal powder particles are separated under the action of a large centrifugal force, so that the coal powder airflow is efficiently concentrated, but the high-speed rotation of the coal powder airflow needs a large pressure drop, so that the resistance of the cyclone cylinder coal powder concentrator is large, and the resistance coefficient is usually about 5-7. The shutter coal powder concentrator or the elbow coal powder concentrator has the principle that most particles deviate from the flowing direction of airflow due to the self inertia effect through the rapid turning of gas-solid two-phase flow, so that the coal powder is concentrated, the resistance coefficient is small and is generally near 1-2, but the concentration efficiency is far lower than that of a cyclone coal powder concentrator. How to ensure the efficient concentration of the pulverized coal by the pulverized coal concentrator on the basis of low energy consumption is one of the important problems for realizing energy conservation and emission reduction of the coal-fired boiler.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a low-energy-consumption high-efficiency pulverized coal concentrator.
The technical scheme adopted by the invention is as follows: a low-energy-consumption high-efficiency pulverized coal concentrator comprises a concentrated pulverized coal airflow mixing channel, a three-level concentrated pulverized coal airflow channel, a two-level light pulverized coal airflow channel, a two-level partition plate, a two-level pulverized coal concentrating chamber, a divergent channel, a one-level concentrated pulverized coal airflow channel, a one-level blade, a one-level pulverized coal concentrating chamber, a one-level partition plate, a one-level light pulverized coal airflow channel, a light pulverized coal airflow mixing channel, a rotational pulverized coal concentrating chamber and a three-level light pulverized coal airflow channel. The upper end of the first-stage pulverized coal concentrating chamber is an inlet of pulverized coal airflow, a first-stage partition plate is arranged at an outlet at the lower end of the first-stage pulverized coal concentrating chamber, the outlet end of the first-stage pulverized coal concentrating chamber is divided into two channels by the first-stage partition plate, the two channels are a first-stage light pulverized coal airflow channel positioned on the left side and a first-stage thick pulverized coal airflow channel positioned on the right side respectively, and the first-stage thick pulverized coal airflow channel is communicated with the second-stage pulverized; the outlet end of the second-stage pulverized coal concentrating chamber is divided into two channels, namely a second-stage light pulverized coal airflow channel positioned on the left side and a second-stage thick pulverized coal airflow channel positioned on the right side; the lower end of the primary light pulverized coal airflow channel is communicated with the secondary light pulverized coal airflow channel, passes through the light pulverized coal airflow mixing channel and is communicated with the rotational flow pulverized coal concentration chamber; the third-stage concentrated coal powder airflow channel is connected and communicated with the second-stage concentrated coal powder airflow channel; the concentrated coal powder airflow mixing channel is positioned at the joint of the third-level concentrated coal powder airflow channel and the second-level concentrated coal powder airflow channel;
the primary coal dust concentrating chamber is internally provided with primary blades which are distributed in a step shape from the upper end inlet of the primary coal dust concentrating chamber to the primary partition plate.
In the scheme, the number of the first-stage blades is 3-4.
In the scheme, the square-to-circle structure and the swing vane assembly are sequentially arranged at the communication position of the light pulverized coal airflow mixing channel and the rotational flow pulverized coal concentrating chamber.
In the above scheme, the cross section of the light pulverized coal air mixing channel is rectangular, the cross section of the rotational flow pulverized coal concentrating chamber is circular, the cross section of one end of the square variable-circle structure is adapted to the light pulverized coal air mixing channel, the other end of the square variable-circle structure is adapted to the cross section of the rotational flow pulverized coal concentrating chamber, and the light pulverized coal air mixing channel and the rotational flow pulverized coal concentrating chamber are connected together through the square variable-circle structure.
In the above scheme, the rotation starting blade assembly comprises a rotation starting blade and a connecting shaft, the rotation starting blade is uniformly arranged on the connecting shaft along the circumferential direction, and the connecting shaft is located at the central axis of the interior of the cyclone pulverized coal concentrating chamber.
In the scheme, a plurality of secondary blades are arranged in the secondary coal powder concentrating chamber, and the secondary blades are distributed in a step shape from the outlet of the divergent channel to the outlet of the secondary coal powder concentrating chamber.
In the scheme, the number of the secondary blades is 2-3.
The invention has the beneficial effects that: the low-energy-consumption high-efficiency pulverized coal concentrator has the advantages that the upper end of the primary pulverized coal concentrating chamber is an inlet of pulverized coal airflow, the outlet at the lower end of the primary pulverized coal concentrating chamber is provided with the primary partition plate, the outlet end of the primary pulverized coal concentrating chamber is divided into a primary light pulverized coal airflow channel and a primary thick pulverized coal airflow channel, and the primary thick pulverized coal airflow channel is communicated with the secondary pulverized coal concentrating chamber after passing through the gradually-expanded channel; the outlet at the lower end of the second-stage coal dust concentrating chamber is divided into a second-stage light coal dust airflow channel and a second-stage thick coal dust airflow channel by a second-stage partition plate; the lower end of the first-stage light pulverized coal airflow channel is communicated with the second-stage light pulverized coal airflow channel, then passes through the light pulverized coal airflow mixing channel and is communicated with the rotational flow pulverized coal concentration chamber, the first airflow outlet end of the second-stage thick pulverized coal airflow channel is communicated with the thick pulverized coal airflow mixing channel inlet positioned at the lower part, and the second airflow outlet end of the second-stage thick pulverized coal airflow channel is communicated with the rotational flow pulverized coal concentration chamber. The device concentrates the coal dust and mainly uses inertial separation, so that the overall energy consumption is low, and the device has the advantages of high concentration efficiency, low energy consumption and compact structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a low-energy-consumption high-efficiency pulverized coal concentrator in an embodiment of the invention;
FIG. 2 is a top view of a low energy and high efficiency coal dust concentrator in an embodiment of the present invention;
FIG. 3 is a bottom view of a low energy and high efficiency coal dust concentrator in an embodiment of the present invention;
FIG. 4 is a three-dimensional view of a swing blade of a low energy consumption high efficiency pulverized coal concentrator in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a low energy consumption high efficiency coal dust concentrator in an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a low-energy-consumption high-efficiency pulverized coal concentrator in example 2 of the present invention;
FIG. 7 is a schematic view of a low-energy-consumption high-efficiency pulverized coal concentrator in example 2 of the present invention;
FIG. 8 is a schematic structural diagram of a low-energy-consumption high-efficiency pulverized coal concentrator in example 3 of the present invention;
FIG. 9 is a schematic view of a low energy consumption high efficiency pulverized coal concentrator in example 3 of the present invention;
the numbers in the figure illustrate the following: the coal dust mixing device comprises a thick coal dust airflow mixing channel 1, a three-level thick coal dust airflow channel 2, a two-level thick coal dust airflow channel 3, a two-level light coal dust airflow channel 4, a two-level partition plate 5, a two-level coal dust concentrating chamber 6, a two-level blade 7, a divergent channel 8, a one-level thick coal dust airflow channel 9, a one-level blade 10, a one-level coal dust concentrating chamber 11, a one-level partition plate 12, a one-level light coal dust airflow channel 13, a light coal dust airflow mixing channel 14, a 15-square rounding structure, a connecting shaft 16, a rotary blade 17, a rotational flow coal dust concentrating chamber 18, a three-level light coal dust airflow channel 19, a light coal.
Detailed Description
In order to clarify the objects, technical solutions and advantages of the present invention, a low energy consumption and high efficiency coal dust concentrator of the present invention will be further described in detail by the following examples. It should be noted that the specific embodiments described herein are only for explaining the present invention and are not used to limit the present invention.
Example 1:
the invention discloses a low-energy-consumption high-efficiency pulverized coal concentrator, which comprises a concentrated pulverized coal airflow mixing channel 1, a three-level concentrated pulverized coal airflow channel 2, a two-level concentrated pulverized coal airflow channel 3, a two-level light pulverized coal airflow channel 4, a two-level partition plate 5, a two-level pulverized coal concentrating chamber 6, a two-level blade 7, a gradually expanding channel 8, a one-level concentrated pulverized coal airflow channel 9, a one-level blade 10, a one-level pulverized coal concentrating chamber 11, a one-level partition plate 12, a one-level light pulverized coal airflow channel 13, a light pulverized coal airflow mixing channel 14, a square rounding structure 15, a connecting shaft 16, a turning blade 17, a rotational pulverized coal concentrating chamber 18 and a three-.
As shown in fig. 1 to 5, the upper end of the primary coal dust concentrating chamber 11 in this embodiment is an inlet of the coal dust airflow. A plurality of first-stage blades 10 are arranged inside the first-stage coal powder concentrating chamber 11, the number of the first-stage blades 10 can be 3-4, and the first-stage coal powder concentrating chamber 11 is arranged in a stepped mode.
As shown in fig. 1, the first-stage partition plate 12 in this embodiment is located at an outlet at a lower end of the first-stage coal dust concentrating chamber 11, and the first-stage partition plate 12 divides the outlet of the first-stage coal dust concentrating chamber 11 into two passages, namely, a first-stage light coal dust airflow passage 13 located on a left side and a first-stage thick coal dust airflow passage 9 located on a right side.
The outlet section of the lower end of the first-stage concentrated pulverized coal airflow channel 9 is gradually widened to form a gradually-expanding channel 8, the lower end of the gradually-expanding channel 8 is a second-stage pulverized coal concentrating chamber 6, a plurality of second-stage blades 7 are arranged inside the second-stage pulverized coal concentrating chamber 6, the number of the second-stage blades 7 is 2-3, and the second-stage pulverized coal concentrating chamber 6 is arranged in a stepped manner.
The secondary partition plate 5 in this embodiment is located at the outlet of the lower end of the secondary pulverized coal concentrating chamber 6. The outlet end of the second-stage coal powder concentrating chamber 6 is divided into two channels by the second-stage partition plate 5, namely a second-stage light coal powder airflow channel 4 on the left side and a second-stage thick coal powder airflow channel 3 on the right side.
The primary light coal powder airflow channel 13 is communicated with the secondary light coal powder airflow channel 4, and a light coal powder airflow mixing channel 14 is formed at the convergence position of the primary light coal powder airflow channel 13 and the secondary light coal powder airflow channel 4.
The square rounding structure 15 is arranged between the light coal powder airflow mixing channel 14 and the rotational flow coal powder concentrating chamber 18. The cross section of the light coal powder air flow mixing channel 14 is rectangular, the cross section of the rotational flow coal powder concentrating chamber 18 is circular, the cross section of one end of the square rounding structure 15 in the embodiment is rectangular, the cross section of the other end of the square rounding structure is circular, and the light coal powder air flow mixing channel 14 and the rotational flow coal powder concentrating chamber 18 are connected together through the square rounding structure 15.
The swing vane assembly in this embodiment includes a swing vane 17 and a connecting shaft 16, the connecting shaft 16 is located at the central axis inside the swirling pulverized coal concentrating chamber 18, the swing vanes 17 are uniformly arranged on the connecting shaft 16 along the circumferential direction, and the connecting shaft 16, the swing vanes 17 and the swirling pulverized coal concentrating chamber 18 are rigidly connected.
In this embodiment, the third-stage light pulverized coal airflow channel 19 is located at the center of the lower end of the swirling pulverized coal concentrating chamber 18, the third-stage light pulverized coal airflow channel 19 is in a circular tube shape, and the third-stage thick pulverized coal airflow channel 2 is obliquely arranged at the lower end of the swirling pulverized coal concentrating chamber 18.
As shown in fig. 1, the third-stage rich pulverized coal airflow channel 2 is communicated with the second-stage rich pulverized coal airflow channel 3, and the rich pulverized coal airflow mixing channel 1 is located at the joint of the third-stage rich pulverized coal airflow channel 2 and the second-stage rich pulverized coal airflow channel 3.
In the low-energy-consumption high-efficiency pulverized coal concentrator in the embodiment, pulverized coal airflow enters from a pulverized coal airflow inlet at the upper end of a first-stage pulverized coal concentrating chamber 11, and the pulverized coal airflow turns rapidly in the process of meeting with a first-stage blade, wherein most of pulverized coal particles cannot bypass the first-stage blade 10 after impacting the first-stage blade 10 due to the inertia effect, and only gather at the opposite side of the first-stage blade 10, namely the right side area of the first-stage pulverized coal concentrating chamber 11 and are brought into a first-stage concentrated pulverized coal airflow channel 9 at the right side along with the airflow, so that a high-concentration first-stage concentrated pulverized coal airflow is formed, a small amount of pulverized coal particles (usually with relatively small particle size) can bypass the first-stage blade 10 and are brought into a first-stage light pulverized coal. Then, the primary concentrated pulverized coal airflow enters the secondary pulverized coal concentrating chamber 6 through the divergent channel 8 and further meets the secondary blade 7 in the secondary pulverized coal concentrating chamber 6, and similarly, in the process of rapid turning of the primary concentrated pulverized coal airflow, most particles cannot bypass the secondary blade 7 after impacting the secondary blade 7, and only can gather at the opposite side of the secondary blade 7, namely the right side area of the secondary pulverized coal concentrating chamber 6 and are brought into the secondary concentrated pulverized coal airflow channel 3 on the right side along with the airflow, so that the secondary concentrated pulverized coal airflow with further improved pulverized coal concentration is formed, a small amount of pulverized coal particles can bypass the secondary blade 7 and are brought into the secondary light pulverized coal airflow channel 4 by the airflow on the left side, and the secondary light pulverized coal airflow with lower concentration is formed. Meanwhile, in the continuous flowing process of each air flow, the primary light coal powder air flow and the secondary light coal powder air flow meet and are mixed in the light coal powder air flow mixing channel 14, the mixed light coal powder air flow enters the rotational flow coal powder concentrating chamber 18 through the square rounding structure 15 and meets the rotary opening blade 17 positioned in the rotational flow coal powder concentrating chamber 18, the air flow is guided by the rotary opening blade 17 in the process of flowing through the rotary opening blade 17 to convert the linear flow into the rotary flow, and the mixed light coal powder air flow is subjected to larger inertial centrifugal force in the high-speed rotating process, so that the mixed light coal powder air flow is more easily thrown to the wall surface area of the rotational flow coal powder concentrating chamber 18, the coal powder concentration of the wall surface area is relatively higher, and the coal powder concentration of the central area is lower. Finally, the coal dust airflow with lower concentration in the central area flows out from the three-level light coal dust airflow channel 19 to form three-level light coal dust airflow. And the coal dust airflow with higher concentration in the wall surface area flows downwards along an annular channel formed between the three-level light coal dust airflow channel 19 and the rotational flow coal dust concentrating chamber 18 and finally flows out from the three-level concentrated coal dust airflow channel 2 to form three-level concentrated coal dust airflow. Then, the third-level concentrated coal dust airflow and the second-level concentrated coal dust airflow meet and are mixed in the concentrated coal dust airflow mixing channel 1, and finally flow out of the concentrated coal dust airflow mixing channel 1.
Example 2:
the main difference between this embodiment and embodiment 1 is that, as shown in fig. 6, the two-stage dense pulverized coal airflow channel 3, the two-stage weak pulverized coal airflow channel 4, the two-stage partition plate 5, the two-stage pulverized coal concentrating chamber 6, the two-stage blade 7, the divergent channel 8, the one-stage dense pulverized coal airflow channel 9, the one-stage blade 10, the one-stage pulverized coal concentrating chamber 11, the one-stage partition plate 12, the one-stage weak pulverized coal airflow channel 13, and the weak pulverized coal airflow mixing channel 14 are included.
The upper end of a first-stage coal powder concentrating chamber 11 in the embodiment is a coal powder airflow inlet, a plurality of first-stage blades 10 are arranged inside the first-stage coal powder concentrating chamber 11, the number of the first-stage blades 10 is 3-4, and the first-stage coal powder concentrating chamber 11 is arranged in a step shape.
As shown in fig. 6, the first-stage partition plate 12 is located at the outlet of the lower end of the first-stage coal dust concentrating chamber 11, and the first-stage partition plate 12 divides the outlet of the first-stage coal dust concentrating chamber 11 into two passages, namely, a first-stage light coal dust airflow passage 13 located on the left side and a first-stage thick coal dust airflow passage 9 located on the right side.
The sectional area of the primary concentrated coal powder airflow channel 9 is gradually increased to form a gradually expanding channel 8, and the outlet of the gradually expanding channel 8 is communicated with the secondary coal powder concentrating chamber 6. A plurality of second-stage blades 7 are arranged inside the second-stage pulverized coal concentrating chamber 6, the number of the second-stage blades 7 is 2-3, and the second-stage pulverized coal concentrating chamber 6 is arranged in a step shape.
The second-stage partition plate 5 is positioned at an outlet at the lower end of the second-stage pulverized coal concentrating chamber 6, and the outlet of the second-stage pulverized coal concentrating chamber 6 is divided into two channels by the second-stage partition plate 5, namely a second-stage light pulverized coal airflow channel 4 positioned on the left side and a second-stage thick pulverized coal airflow channel 3 positioned on the right side.
The primary light coal powder air flow channel 13 is communicated with the secondary light coal powder air flow channel 4, and the light coal powder air flow mixing channel 14 is positioned at the joint of the primary light coal powder air flow channel 13 and the secondary light coal powder air flow channel 4 and is communicated with the primary light coal powder air flow channel 13 and the secondary light coal powder air flow channel 4.
Example 3:
as shown in fig. 8, the low-energy-consumption high-efficiency pulverized coal concentrator in this embodiment includes a first-stage concentrated pulverized coal airflow channel 9, a first-stage blade 10, a first-stage pulverized coal concentrating chamber 11, a first-stage partition plate 12, a first-stage light pulverized coal airflow channel 13, a square rounding structure 15, a connecting shaft 16, a swing blade 17, a swirling pulverized coal concentrating chamber 18, a central light pulverized coal airflow channel 20, and a peripheral concentrated pulverized coal airflow channel 21.
The upper end of the first-stage coal powder concentrating chamber 11 is a coal powder airflow inlet, a plurality of first-stage blades 10 are arranged inside the first-stage coal powder concentrating chamber 11, the number of the first-stage blades 10 is 3-4, and the first-stage coal powder concentrating chamber 11 is arranged in a stepped manner.
The primary partition plate 12 is positioned at the outlet of the lower end of the primary coal powder concentrating chamber 11. The outlet end of the primary coal powder concentrating chamber 11 is divided into two channels by a primary partition plate 12, namely a primary light coal powder airflow channel 13 on the left side and a primary thick coal powder airflow channel 9 on the right side.
A square-to-round structure 15 and a swing vane assembly are sequentially arranged between the primary light pulverized coal airflow channel 13 and the rotational flow pulverized coal concentration chamber 18, the cross section of the primary light pulverized coal airflow channel 13 is rectangular, the cross section of the rotational flow pulverized coal concentration chamber 18 is circular, the cross section of one end of the square-to-round structure 15 is rectangular, the cross section of the other end of the square-to-round structure 15 is circular, and the primary light pulverized coal airflow channel 13 and the rotational flow pulverized coal concentration chamber 18 are connected through the square-to-round structure 15.
The vane assembly in this embodiment includes the turning-on vane 17 and the connecting shaft 16, and the connecting shaft 16 is located the inside central axis department of whirl buggy concentration chamber 18, and a plurality of turning-on vanes 17 evenly arrange on the connecting shaft 16 along the circumferencial direction, connecting shaft 16, turning-on vane 17 and whirl buggy concentration chamber 18 are rigid connection.
As shown in fig. 8, the central light pulverized coal flow passage 20 is located at the center of the lower end of the swirling pulverized coal concentrating chamber 18, the central light pulverized coal flow passage 20 is in a circular tube shape, and the peripheral concentrated pulverized coal flow passage 21 is obliquely arranged at the lower end of the swirling pulverized coal concentrating chamber 18.
As shown in fig. 8, the primary rich pulverized coal flow passage 9 communicates with the surrounding rich pulverized coal flow passage 21.
Table 1 shows the coal dust concentration effect and the corresponding resistance coefficient range in the above examples one to three. It can be seen that the first embodiment, the second embodiment and the third embodiment can realize efficient concentration of the pulverized coal, and have low resistance coefficient, and have low energy consumption in the vicinity of 1-3.
TABLE 1 coal dust concentration Effect
| Item | Example 1 | Example 2 | Example 3 |
| Dense coal airflow rate (%) | ~30 | ~12 | ~52 |
| Fresh coal air flow (%) | ~70 | ~88 | ~48 |
| Concentrated coal dust air flow powder content (%) | ~92 | ~46 | ~95 |
| Light coal powder airflow powder content (%) | ~8 | ~54 | ~5 |
| Relative coal dust concentration in concentrated coal dust airflow | ~3.1 | ~3.8 | ~1.8 |
| Relative coal powder concentration in light coal powder airflow | ~0.1 | ~0.6 | ~0.1 |
| Coefficient of |
1~3 | 1~2 | 1~2 |
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A low-energy-consumption high-efficiency pulverized coal concentrator is characterized in that: the device comprises a concentrated coal powder airflow mixing channel, a three-stage concentrated coal powder airflow channel, a two-stage light coal powder airflow channel, a two-stage partition plate, a two-stage coal powder concentrating chamber, a divergent channel, a one-stage concentrated coal powder airflow channel, a one-stage blade, a one-stage coal powder concentrating chamber, a one-stage partition plate, a one-stage light coal powder airflow channel, a light coal powder airflow mixing channel, a rotational flow coal powder concentrating chamber and a three-stage light coal powder airflow channel; the upper end of the first-stage pulverized coal concentrating chamber is an inlet of pulverized coal airflow, a first-stage partition plate is arranged at an outlet at the lower end of the first-stage pulverized coal concentrating chamber, the outlet end of the first-stage pulverized coal concentrating chamber is divided into two channels by the first-stage partition plate, the two channels are a first-stage light pulverized coal airflow channel positioned on the left side and a first-stage thick pulverized coal airflow channel positioned on the right side respectively, and the first-stage thick pulverized coal airflow channel is communicated with the second-stage pulverized coal; the outlet end of the second-stage pulverized coal concentrating chamber is divided into two channels, namely a second-stage light pulverized coal airflow channel positioned on the left side and a second-stage thick pulverized coal airflow channel positioned on the right side; the lower end of the primary light pulverized coal airflow channel is communicated with the secondary light pulverized coal airflow channel to form a light pulverized coal airflow mixing channel, and the light pulverized coal airflow mixing channel is communicated with the rotational flow pulverized coal concentration chamber; the third-stage concentrated coal powder airflow channel is connected and communicated with the second-stage concentrated coal powder airflow channel; the concentrated coal powder airflow mixing channel is positioned at the joint of the third-level concentrated coal powder airflow channel and the second-level concentrated coal powder airflow channel;
the primary coal powder concentrating chamber is internally provided with primary blades which are distributed in a step shape from the concentrator inlet to the primary partition plate.
2. The low-energy-consumption high-efficiency pulverized coal concentrator as claimed in claim 1, wherein the number of the first-stage blades is 3-4.
3. The low-energy-consumption high-efficiency pulverized coal concentrator as claimed in claim 1, wherein a square-to-round structure and a swing vane assembly are sequentially arranged at the communication position of the light pulverized coal airflow mixing channel and the rotational pulverized coal concentrating chamber.
4. The low-energy-consumption high-efficiency pulverized coal concentrator as claimed in claim 3, wherein the cross section of the light pulverized coal gas flow mixing channel is rectangular, the cross section of the rotational flow pulverized coal concentrating chamber is circular, the cross section of one end of the square-to-circle structure is adapted to the light pulverized coal gas flow mixing channel, the cross section of the other end of the square-to-circle structure is adapted to the cross section of the rotational flow pulverized coal concentrating chamber, and the light pulverized coal gas flow mixing channel and the rotational flow pulverized coal concentrating chamber are connected together through the square-to-circle structure.
5. The low-energy-consumption high-efficiency pulverized coal concentrator as claimed in claim 3, wherein the rotation starting vane assembly comprises rotation starting vanes and a connecting shaft, the rotation starting vanes are uniformly arranged on the connecting shaft along the circumferential direction, and the connecting shaft is positioned at the central axis of the interior of the rotational flow pulverized coal concentrating chamber.
6. The low-energy-consumption high-efficiency pulverized coal concentrator as claimed in any one of claims 1 to 5, wherein a plurality of secondary blades are arranged in the secondary pulverized coal concentrating chamber, and the secondary blades are distributed in a step shape from the outlet of the divergent channel to the outlet of the secondary pulverized coal concentrating chamber.
7. The low-energy-consumption high-efficiency pulverized coal concentrator as claimed in claim 6, wherein the number of the secondary blades is 2-3.
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