CN212481266U - Boiler desulfurization limestone powder and coal mixing system - Google Patents
Boiler desulfurization limestone powder and coal mixing system Download PDFInfo
- Publication number
- CN212481266U CN212481266U CN202020824831.1U CN202020824831U CN212481266U CN 212481266 U CN212481266 U CN 212481266U CN 202020824831 U CN202020824831 U CN 202020824831U CN 212481266 U CN212481266 U CN 212481266U
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- Prior art keywords
- coal
- mixing
- storehouse
- limestone powder
- bin
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- 235000019738 Limestone Nutrition 0.000 title claims abstract description 62
- 239000006028 limestone Substances 0.000 title claims abstract description 62
- 239000003245 coal Substances 0.000 title claims abstract description 51
- 239000000843 powder Substances 0.000 title claims abstract description 51
- 238000002156 mixing Methods 0.000 title claims abstract description 47
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 16
- 230000023556 desulfurization Effects 0.000 title claims abstract description 16
- 235000013312 flour Nutrition 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000000428 dust Substances 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 9
- 230000003139 buffering effect Effects 0.000 abstract 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 14
- 230000008859 change Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a boiler desulfurization limestone flour and coal hybrid system, including the limestone flour storehouse, the limestone flour storehouse is connected to the buffering storehouse top on the coal conveyor belt through limestone flour output pipeline, the coal conveyor belt of two side by side settings has been erect to the below of buffering storehouse, the buffering storehouse passes through batcher and two limestone flour unloading pipelines to the coal conveyor belt feed, the coal conveyor belt is the endless conveyor belt that the slope upwards set up, its output is located the upper end, and the below of output is equipped with mixes the storehouse, the upper end in mixing the storehouse is equipped with mixed baffle, it erects in mixing the storehouse to mix baffle dislocation slope, the bottom portion discharge end in mixing the storehouse is the back taper, the top of the bottom discharge gate in mixing the storehouse is equipped with the toper baffle, install the transport flood dragon of vertical setting on the toper baffle. The utility model discloses mix limestone powder and fire coal at the coal-charging in-process, then carry and mix the storage feed to mixing the storehouse, improved all ring edge borders and air quality.
Description
The technical field is as follows:
the utility model relates to a circulating fluidized bed boiler desulfurization technical field mainly relates to a boiler desulfurization limestone powder and coal hybrid system.
Background art:
with the high-speed development of the industry in China and the continuous improvement of the requirements on safety and environmental protection, the circulating fluidized bed boiler is rapidly developed and popularized due to the adoption of a novel clean coal combustion technology, and has the advantages of high combustion efficiency, excellent environmental protection performance, strong coal-fired adaptability, high comprehensive utilization value of ash slag and the like. The circulating fluidized bed adopts limestone powder added in the furnace to realize desulfurization, which is one of the outstanding advantages.
Common limestone powder adding systems in the prior art adopt a limestone powder direct adding desulfurization process in a furnace to realize flue gas desulfurization, the designed desulfurization efficiency is 90%, the actual operation efficiency is higher than 90%, and 1 set of cabin screw variable-frequency speed-regulating feeding system is adopted, so that the problem of failure and shutdown of the desulfurization system caused by feeding and pneumatic conveying jam and abrasion is effectively solved, and the operation rate of the desulfurization system is stabilized to be more than 99%. It still has certain problems:
(1) although the sulfur dioxide emission mass concentration can reach the standard, the operation curve fluctuates up and down and is unstable. Under the condition of stable load, the fluctuation range is 50-300 mg/m 3; under the condition of variable load, the situation that the current standard 400mg/m3 is easily exceeded for a short time is easy to occur.
(2) The operation calcium-sulfur ratio is higher. The designed calcium-sulfur ratio is about 2.2, the actual operation calcium-sulfur ratio exceeds 3.5, and the operation cost of the desulfurization system is greatly high. The operation calcium-sulfur ratio is higher, and the initial analysis shows that the limestone system has more feed caused by uneven distribution of the sulfur dioxide in the flue gas in the furnace.
The reasons for the above disadvantages mainly include the following:
(1) the change in the amount of coal causes a change in the amount of flue gas. The method comprises the steps of unit load change, coal quality change, coal blockage caused by coal feeding of a coal feeder and the like.
(2) The uneven coal amount in the furnace causes uneven distribution of sulfur dioxide in flue gas. The method comprises the conditions that more than 1 coal feeder is shut down, the coal amount of other coal feeders is increased, the sulfur content of coal entering a hearth after blending and blending combustion is uneven, and the like.
(3) The combustion condition changes to cause the temperature of the hearth and the distribution condition of the bed temperature to change.
(4) The pressure fluctuation of a compressed air source of the pneumatic conveying system causes the fluctuation of the feeding amount of the limestone powder.
Therefore, a conveying system for mixing coal and limestone powder.
The utility model has the following contents:
the utility model discloses the purpose is exactly in order to remedy prior art's defect, provides a boiler desulfurization limestone flour and coal hybrid system, mixes limestone flour and fire coal at last coal in-process, then carries to mix the storehouse and mix the storage feed, has improved all ring edge borders and air quality.
The utility model discloses a realize through following technical scheme:
a boiler desulfurization limestone powder and coal mixing system comprises a limestone powder warehouse which is connected to the upper part of a buffer bin on a coal conveying belt through a limestone powder output pipeline, a bin pump is arranged on the limestone powder output pipeline, two coal conveying belts arranged in parallel are erected below the buffer bin, the buffer bin supplies materials to a coal conveying belt through a feeding machine and two limestone powder discharging pipelines, the coal conveying belt is a circulating conveying belt which is obliquely and upwards arranged, the output end of the mixing chamber is positioned at the upper end part, a mixing chamber is arranged below the output end, a mixing guide plate is arranged at the upper end part in the mixing chamber, the mixing guide plate is arranged in the mixing bin in a staggered and inclined mode, the discharge end of the bottom end part of the mixing bin is in an inverted cone shape, the top of mixing the bottom discharge gate in storehouse is equipped with the toper baffle, install the transport flood dragon of vertical setting on the toper baffle.
The limestone powder output pipelines are two, bin pumps are respectively installed on the limestone powder output pipelines, and discharge ends of the bin pumps are connected to an upper end feeding hole of the buffer bin through pipelines.
The dust remover is installed on the buffer bin, a conical cover is arranged at the port of the discharge end of the limestone powder blanking pipeline, the upper end of the conical cover is respectively connected with the dust remover, and the dust remover on the buffer bin and the conical cover is connected to compressed air through pipelines.
The toper baffle of bottom tip passes through the mount to be fixed in the mixing bin bottom portion, one section of carrying the flood dragon is located the top of toper baffle, another section is located the below of toper baffle and stretches into to the ejection of compact pipeline in, and is located the epaxial spiral delivery blade spiral direction of transport of toper baffle upper and lower opposite, the ejection of compact pipeline of mixing bin on install the valve of control unloading volume.
The principle is as follows: the finished limestone powder is discharged from a limestone powder warehouse to a warehouse pump, the limestone powder in the warehouse pump is conveyed to a buffer warehouse on the roof of a coal conveying belt machine by compressed air through a limestone powder conveying main pipe, and then the limestone powder is measured by a variable frequency feeder and a wash plate flowmeter of the buffer warehouse, limestone powder is respectively and uniformly distributed on two coal conveying belts, when the system is put into operation, the limestone distribution proportion is set according to the sulfur content detected by fuel every day, mixing limestone powder and fire coal in the coal feeding process, conveying the mixture to a mixing bin for mixing and storing, the limestone powder and the coal powder can be naturally mixed in the gravity falling process through the structure of the guide plate in the mixing bin, then the structure of the conical baffle below the discharging device can avoid the blockage of the bottom in the discharging process, and through carrying the flood dragon, realize the stirring on the one hand, avoid the jam of mixture, on the other hand makes things convenient for the output of compounding.
The utility model has the advantages that:
the utility model has the advantages of reasonable design, when the system was put into operation, according to the sulphur content of fuel inspection every day, set up limestone delivery proportion, mix limestone flour and fire coal at last coal in-process, then carry and mix the storage to mixing the storehouse, even the phenomenon that instantaneous exceeds standard also is difficult to appear when the variable load operating mode, has improved all ring edge borders and air quality.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the coal conveying belt and the mixing bin.
The specific implementation mode is as follows:
see the drawings.
A boiler desulfurization limestone powder and coal mixing system comprises a limestone powder warehouse 1, wherein the limestone powder warehouse 1 is connected to the upper part of a buffer bin 4 on a coal conveying belt 3 through a limestone powder output pipeline 2, a bin pump is arranged on the limestone powder output pipeline 2, two coal conveying belts 3 which are arranged in parallel are erected below the buffer bin 4, the buffer bin 4 supplies materials to the coal conveying belts through a feeding machine and two limestone powder discharging pipelines, the coal conveying belts 3 are circular conveying belts which are arranged obliquely and upwards, its output is located the upper end, and the below of output is equipped with mixing bin 5, and the upper end in mixing bin 5 is equipped with compounding baffle 6, and 6 misplaces the slope of compounding baffle and erects in mixing bin 5, and the bottom portion discharge end of mixing bin 5 is the back taper, and the top of the bottom discharge gate of mixing bin 5 is equipped with toper baffle 7, installs the transport flood dragon 8 of vertical setting on the toper baffle 7.
Furthermore, the limestone powder output pipelines 2 are two, bin pumps are respectively installed on the limestone powder output pipelines 2, and the discharge ends of the bin pumps are connected to the upper end feed inlet of the buffer bin 4 through pipelines. The normal feeding of the limestone powder is ensured through the two limestone powder output pipe shells, and the feeding stability is ensured.
Furthermore, a dust remover is installed on the buffer bin 4, a conical cover 9 is arranged at the port of the discharge end of the limestone powder blanking pipeline, the upper end of the conical cover 9 is respectively connected with the dust remover, and the dust remover on the buffer bin 4 and the dust remover on the conical cover are both connected to compressed air through pipelines. Through the structure of the dust remover, compressed air is introduced into the corresponding buffer bin and the conical cover, and the dust remover assists in discharging and conveying limestone powder while removing dust.
Further, the toper baffle 7 of bottom tip in the mixing bunker 5 passes through the mount to be fixed in the bottom portion of mixing the bunker, and one section of transport flood dragon 8 is located the top of toper baffle 7, and another section is located the below of toper baffle 7 and stretches into to the ejection of compact pipeline in, and is located the epaxial spiral delivery blade spiral direction of delivery of the toper baffle 7 upper and lower side opposite, installs the valve 10 of control unloading volume on the ejection of compact pipeline of mixing bunker 5. This structure adopts special transport flood dragon structure, when having avoided the material jam, can assist its unloading smoothly, has satisfied the requirement of feed.
When the unit with the structure operates, the operation operator finely adjusts the powder feeding amount of the two limestone powder feeders according to the current sulfur dioxide discharge concentration, and adjusts the sulfur dioxide discharge concentration within a reasonable discharge range. The installation and debugging are completed, the emission concentration of the sulfur dioxide completely realizes the standard emission (200mg/m3) of a new standard, the emission concentration curve of the sulfur dioxide is effectively controlled, the phenomenon of instantaneous standard exceeding is not easy to occur even under the variable load working condition, and the surrounding environment and the air quality are improved.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, connected through an intermediate medium, or connected to the inside of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a boiler desulfurization limestone flour and coal hybrid system, including limestone flour storehouse (1), its characterized in that: the limestone powder warehouse (1) is connected to the upper part of a buffer bin (4) on a coal conveying belt (3) through a limestone powder output pipeline (2), a bin pump is arranged on the limestone powder output pipeline (2), two coal conveying belts (3) arranged in parallel are erected below the buffer bin (4), the buffer bin (4) supplies materials to the coal conveying belt through a feeding machine and two limestone powder blanking pipelines, the coal conveying belt (3) is a circulating conveying belt which is obliquely and upwards arranged, the output end of the coal conveying belt is positioned at the upper end part, a mixing bin (5) is arranged below the output end, a material mixing guide plate (6) is arranged at the upper end part in the mixing bin (5), the material mixing guide plate (6) is obliquely erected in the mixing bin (5) in a staggered mode, the discharge end of the bottom end part of the mixing bin (5) is in a reverse conical shape, and a conical baffle plate (7) is arranged above the discharge hole at the bottom end of the mixing, and a vertically arranged conveying flood dragon (8) is installed on the conical baffle (7).
2. The boiler desulfurized limestone powder and coal mixing system according to claim 1, characterized in that: the limestone powder discharging device is characterized in that the number of the limestone powder discharging pipelines (2) is two, bin pumps are respectively installed on the limestone powder discharging pipelines (2), and the discharging ends of the bin pumps are connected to the upper end feeding hole of the buffer bin (4) through pipelines.
3. The boiler desulfurized limestone powder and coal mixing system according to claim 1, characterized in that: the dust remover is installed on the buffer bin (4), a conical cover (9) is arranged at the port of the discharge end of the limestone powder blanking pipeline, the upper end of the conical cover (9) is respectively connected with the dust remover, and the dust remover on the buffer bin (4) and the conical cover is connected to compressed air through pipelines.
4. The boiler desulfurized limestone powder and coal mixing system according to claim 1, characterized in that: mix bottom portion in storehouse (5) bottom end portion's toper baffle (7) to fix through the mount, carry one section of flood dragon (8) to be located the top of toper baffle (7), another section is located the below of toper baffle (7) and stretches into to the ejection of compact pipeline in, and is located the epaxial spiral delivery blade spiral direction of delivery of toper baffle (7) upper and lower side opposite, the ejection of compact pipeline of mixing storehouse (5) on install valve (10) of control unloading volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020824831.1U CN212481266U (en) | 2020-05-18 | 2020-05-18 | Boiler desulfurization limestone powder and coal mixing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020824831.1U CN212481266U (en) | 2020-05-18 | 2020-05-18 | Boiler desulfurization limestone powder and coal mixing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212481266U true CN212481266U (en) | 2021-02-05 |
Family
ID=74461064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020824831.1U Expired - Fee Related CN212481266U (en) | 2020-05-18 | 2020-05-18 | Boiler desulfurization limestone powder and coal mixing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212481266U (en) |
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2020
- 2020-05-18 CN CN202020824831.1U patent/CN212481266U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210205 |