CN220729938U - Screening and weighing device of pulverized coal fineness detection equipment - Google Patents
Screening and weighing device of pulverized coal fineness detection equipment Download PDFInfo
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- CN220729938U CN220729938U CN202322303102.8U CN202322303102U CN220729938U CN 220729938 U CN220729938 U CN 220729938U CN 202322303102 U CN202322303102 U CN 202322303102U CN 220729938 U CN220729938 U CN 220729938U
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- 238000012216 screening Methods 0.000 title claims abstract description 74
- 239000003245 coal Substances 0.000 title claims abstract description 61
- 238000005303 weighing Methods 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 59
- 238000006073 displacement reaction Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 99
- 238000004140 cleaning Methods 0.000 claims description 44
- 239000002817 coal dust Substances 0.000 description 22
- 238000003860 storage Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000007599 discharging Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- 102220131792 rs886046308 Human genes 0.000 description 1
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Abstract
The utility model discloses a screening and weighing device of pulverized coal fineness detection equipment. In order to solve the problem of lower automatic detection precision in the prior art; the utility model comprises a screening device and a weighing device; the screening device comprises an upper cover assembly and a movable lower cover which form a sealing cavity with the screening net, and the upper cover assembly and the movable lower cover are respectively connected with a driving device for controlling the displacement of the upper cover assembly and the movable lower cover; the weighing device is connected with the separating screen through a connecting rod; and the upper cover assembly and the movable lower cover are separated from the separating screen during weighing, and the weighing device respectively obtains the weights of the pulverized coal before and after the separating screen. The component screening device is constructed to form a sealed negative pressure environment during operation, the pulverized coal screening is carried out, the pulverized coal is separated during weighing, only the weight of the screening screen is weighed, and the detection precision is higher.
Description
Technical Field
The utility model relates to the field of pulverized coal fineness detection, in particular to a screening and weighing device of pulverized coal fineness detection equipment.
Background
At present, coal-fired thermal power generation is taken as the main force in the power production of China, the generated energy of coal accounts for more than 70% of the total generated energy of China, and the coal power generation is still the main force power generation of China for a long time.
The production process of the coal motor unit is to burn coal through a boiler to generate high-temperature and high-pressure steam, push a steam turbine to rotate to do work and drive a generator to generate electricity, and realize the process of converting primary energy into electric energy.
Coal burned in the boiler is ground into fine coal powder through a coal mill, and the fine coal powder is sprayed into the boiler for combustion after being mixed with air powder. The fineness of the pulverized coal entering the boiler directly affects the combustion stability and combustion efficiency of the boiler, so that the fineness measurement and control of the pulverized coal produced by a coal mill of the boiler are very important.
At present, coal-fired power plants generally adopt a manual analysis method to obtain coal fines. According to the measuring method, after a powder sample is manually weighed, a screening net is placed into the powder sample, mechanical rotation is carried out, the screening net is used for knocking the powder sample, coarse powder is manually collected, weighing is carried out, the fineness of the pulverized coal is calculated, the detecting procedure is complicated, the detecting time is long, the data quantity is small, the powder sample can be only used for step data check, and reliable data support cannot be provided for controlling the fineness of the coal mill in the continuous production process. The manual analysis has the defects of large workload, delay analysis time and small data volume, and the closed-loop operation cannot be realized for controlling the fineness of the pulverized coal, so that the fluctuation of the fineness of the pulverized coal is large, and the stable operation and the boiler efficiency of the boiler are seriously affected.
At present, coal-fired power plants do not find products with coal fines fineness in full-automatic detection, but the use effects are not ideal by adopting a charge method, a laser method, a photographic comparison method, a micro-nano wave method and the like, and no mature products exist in the market. The measuring device adopts a aerodynamic separation method, has the characteristics of high separation speed, high efficiency, high measurement precision and the like, and can truly realize production and application.
Disclosure of Invention
The utility model mainly solves the problem of lower automatic detection precision in the prior art; the screening weighing device of the pulverized coal fineness detection equipment is provided, the screening device is constructed to form a sealed negative pressure environment during operation, pulverized coal screening is carried out, separation is carried out during weighing, only the weight at the screening screen is weighed, and the detection precision is higher.
The technical problems of the utility model are mainly solved by the following technical proposal:
a screening and weighing device of pulverized coal fineness detection equipment comprises a screening device and a weighing device; the screening device comprises an upper cover assembly and a movable lower cover which form a sealing cavity with the screening net, and the upper cover assembly and the movable lower cover are respectively connected with a driving device for controlling the displacement of the upper cover assembly and the movable lower cover; the weighing device is connected with the separating screen through a connecting rod; and the upper cover assembly and the movable lower cover are separated from the separating screen during weighing, and the weighing device respectively obtains the weights of the pulverized coal before and after the separating screen.
The component screening device is constructed to form a sealed negative pressure environment during operation, the pulverized coal screening is carried out, the pulverized coal is separated during weighing, only the weight of the screening screen is weighed, and the detection precision is higher.
Preferably, the screening device further comprises a rotary air knife, the rotary air knife is arranged on the inner side of the movable lower cover, the negative pressure fan forms a negative pressure environment in the sealing cavity, and the rotary air knife is used for screening the pulverized coal in a fluidized state.
Preferably, the upper cover assembly comprises an upper cover and a sealing ring, and the upper cover is connected with the separating screen through the sealing ring.
Preferably, the driving device comprises an upper push rod and a lower push rod; the upper push rod is connected with a sealing ring in the upper cover assembly to drive the sealing ring to move; the lower push rod is connected with the movable lower cover and drives the movable lower cover to move.
The upper push rod only moves the sealing ring in the upper cover assembly, the upper cover is not moved, the change of the whole system is reduced during movement, the stability of the system is ensured, and the movement of the rigid pipeline is avoided.
When weighing, the upper push rod and the lower push rod respectively control the sealing ring at the upper cover and the movable lower cover to separate from the separating screen, and only the separating screen is connected with the weighing device, so that the influence of other components on weighing is reduced. Under the screening state, the upper cover is matched with the sealing ring, the lower cover and the screening net are moved to form a sealing cavity, the sealing cavity is pumped into negative pressure through the negative pressure fan, and the pulverized coal is in a fluidization state by combining the rotating wind of the rotating wind knife, so that fine powder is filtered through the screening net.
Preferably, a coarse powder return loop and a fine powder return loop are arranged between the negative pressure fan and the screening device;
the coarse powder return loop comprises a coarse powder return pipeline connected with the upper cover and the negative pressure fan, and a coarse powder cleaning valve is arranged on the coarse powder return pipeline;
the fine powder return loop comprises a fine powder return pipeline connected with the movable lower cover and the negative pressure fan, and a fine powder screening valve is arranged on the fine powder return pipeline.
The fine powder return pipe is a spiral hose. The device is used for absorbing the up-and-down displacement of the lower sealing cover, facilitating the movement of the lower cover, and reducing the influence on the system stability caused by the movement.
Preferably, the screening device is further provided with a screening device cleaning loop;
the cleaning loop of the screening device sends compressed air into the screening device from the upper cover through a cleaning pipeline, and a cleaning valve is arranged on the cleaning pipeline. Compressed air sweeps the sifter, ensuring clean.
Preferably, the weighing device comprises an electronic level and a sealed cover; the electronic balance is arranged in the sealing cover; the connecting rod is connected with the electronic level and the separating screen in the sealing cover through the sealing gas ring arranged on the sealing cover.
Preferably, the weighing device further comprises an adjusting block and a balancing block; the adjusting block automatically adjusts the position of the screen separating assembly; the weight balances the weight of the split screen assembly.
The sealing gas ring is connected with an electronic balance cleaning pipeline, and an electronic balance cleaning valve is arranged on the electronic balance cleaning pipeline. Dustproof sealing, ensure weighing accuracy.
The beneficial effects of the utility model are as follows:
in the screening state, the upper cover, the movable lower cover and the screening net form a sealing cavity, the sealing cavity is pumped into negative pressure through a negative pressure fan, and the pulverized coal is in a fluidization state by combining the rotary air of the rotary air knife, so that fine powder is filtered through the screening net. When weighing, the upper push rod and the lower push rod respectively control the upper cover and the movable lower cover to separate from the separating screen, and only the separating screen is connected with the weighing device, so that the influence of other components on weighing is reduced.
Drawings
FIG. 1 is a schematic diagram of a pulverized coal fineness detecting apparatus according to the present utility model.
The device comprises a sampling machine 1, a powder storage tank 3, a powder feeder 4, a screen separating machine 5, an electronic balance 6, a negative pressure fan 7, a coal powder pipe 8, a powder feeding valve of the screen separating machine 9, an upper cover 10, a lower cover 11, an upper push rod 12, a lower push rod 13, a rotary air knife 14, an air knife motor 15, a connecting rod 16, a regulating block 17, a balance block 18, a sealing cover 19, a sealing gas ring 20, a powder feeding valve 21, a powder vibrator 22, a powder feeding vibrator 23, a cleaning valve 24, a push rod air inlet control valve 25, an electronic balance cleaning valve 26, a powder cleaning valve 27, a powder separating valve 28, a powder feeding machine cleaning valve 29, a manual sampling port 30 and a sealing ring.
Detailed Description
The technical scheme of the utility model is further specifically described below through examples and with reference to the accompanying drawings.
Examples:
the screening and weighing device of the pulverized coal fineness detection device of the embodiment is shown in fig. 1, and the whole pulverized coal fineness detection device comprises a sampler 1, a powder storage tank 2, a powder feeder 3, a screening device, a weighing device, a negative pressure fan 6 and a pulverized coal pipe 7.
The sampler 1 acquires samples from the coal powder pipe 7 to obtain coal powder. A pipeline is arranged below the sampler 1, coal dust falls into a powder storage tank 2 through the pipeline, and the powder storage tank 2 is used for storing the coal dust sampled by the sampler 1. A useful powder discharging pipeline is arranged below the powder storage tank 2, and the other end of the powder discharging pipeline is connected into the powder feeder 3 from above. The powder storage tank 2 is provided with a powder discharging vibrator 21, and a powder discharging valve 20 for isolating the powder storage tank 2 and the powder feeder 3 is arranged on a powder discharging pipeline.
The sampling machine 1 samples coal dust from a coal dust pipe, stores the coal dust in a coal dust storage tank through a pipeline, controls whether the coal dust in the coal dust storage tank falls into the powder feeder 3 through the powder discharging valve 20, and the powder discharging vibrator 21 provides vibration with fixed frequency, so that the coal dust in the coal dust storage tank 2 is facilitated to fall.
A powder feeding pipeline is arranged at the bottom of the powder feeder 3, and the other end of the powder feeding pipeline is connected into the screening device through an upper cover 9. Inside the powder feeder 3, stirring blades for stirring the pulverized coal are arranged along the radius, and the stirring blades are driven by a motor. The bottom of the powder feeder 3 is also provided with a manual sampling port 29.
The stirring blade is driven to rotate by a motor to stir the coal dust in the powder feeder 3, so that the coal dust can uniformly fall into the screening device through the powder feeding pipeline.
The powder feeding pipeline is provided with a powder feeding valve 8 of the screening device, and one side of the powder feeding pipeline, which is close to the powder feeder 3, is provided with a powder feeding vibrator 22.
The amount of coal dust falling into the screening device can be controlled by controlling the opening of the powder inlet valve 8 of the screening device; the powder feeding vibrator 22 provides vibration on the powder feeding pipe to facilitate the falling of the pulverized coal.
The screening device comprises a screening net 4, an upper cover 9, a movable lower cover 10 and a rotary air knife 13.
The upper cover 9 is connected with the upper part of the sub-screen 4 in a sealing way through a sealing ring 30; the movable lower cover 10 is in sealing connection with the lower side of the sub-screen through a sealing structure. The upper cover 9 and the movable lower cover 10 are respectively sealed with the separating screen 4 from top to bottom to form a sealing cavity.
A rotary air knife 13 is arranged on the movable lower cover 10 in the sealed cavity, and an air knife motor 14 and an air inlet for driving the rotary air knife 13 are also arranged on the movable lower cover 10. The rotary air knife 13 generates upward rotary air to fluidize the pulverized coal, and the separation screen 4 screens and filters according to the size of the pulverized coal. A coarse powder return loop and a fine powder return loop are arranged between the screening device and the negative pressure fan 6.
The coarse powder return circuit comprises a coarse powder return pipeline connected with the upper cover 9 and the negative pressure fan 6, and a coarse powder cleaning valve 26 is arranged on the coarse powder return pipeline. The fine powder return circuit comprises a fine powder return pipeline connected with the movable lower cover 10 and the negative pressure fan 6, and a fine powder screening valve 27 is arranged on the fine powder return pipeline.
An upper push rod 11 is connected to the sealing upper cover 9 and the sealing ring 30 of the separating screen 4, and the upper push rod 11 drives the sealing ring 30 to move up and down; the movable lower cover 10 is connected with a lower push rod 12, and the lower push rod 12 drives the movable lower cover 10 to move up and down. The fine powder return pipe is a spiral hose, so that the movement of the lower cover 10 is facilitated, and the influence on the system stability caused by the movement is reduced.
The upper push rod and the lower push rod are also connected with a push rod air inlet pipeline, one end of the push rod air inlet pipeline is connected with a push rod, the other end of the push rod air inlet pipeline is connected with compressed air, and a push rod air inlet control valve 24 is arranged on the push rod air inlet pipeline.
When the powder is sieved, the sealing ring 30 and the movable lower cover 10 are respectively in sealing connection with the sieving net 4 through the upper push rod and the lower push rod, a sealing cavity is formed by matching with the upper cover 9, a negative pressure environment is formed in the sealing cavity of the sieving device through the negative pressure fan 6, and the powder is sieved according to the size of the powder by matching with upward rotary air generated by the rotary air knife 13.
The weighing device comprises a sealed enclosure 18, an electronic balance 5, a counterweight 17 and an adjusting mass 16.
The electronic balance 5 is arranged in the sealing cover 18, the sealing cover 18 is provided with a sealing air ring 19, the connecting rod 15 passes through the sealing air ring 19 to connect the electronic balance 5 and the sub-screen 4, the connecting rod 15 transmits the weight of the sub-screen 4 to the electronic balance 5, the adjusting block 16 can automatically adjust the position of the sub-screen assembly, and the balance block 17 balances the weight of the sub-screen assembly.
During weighing, the upper cover 9 and the movable lower cover 10 are separated from the separating screen 4 respectively through the upper pushing rod and the lower pushing rod, and the weighing device only weighs the separating screen 4 and weighs the weights before and after the separating screen respectively for calculating the fineness of the pulverized coal.
The system of this embodiment further comprises a cleaning device. The cleaning device comprises a screening device cleaning loop, an electronic balance cleaning loop and a powder feeder cleaning loop.
The screen separator cleaning circuit feeds compressed air into the screen separator from the upper cover 9 through a cleaning pipe, on which a cleaning valve 23 is provided.
The electronic balance cleaning circuit sends compressed air from the sealing gas ring 19 through an electronic balance cleaning pipeline, and an electronic balance cleaning valve is arranged on the electronic balance cleaning pipeline.
The feeder purge circuit feeds compressed air into the feeder 3 through a feeder purge line on which the feeder purge valve 28 is provided.
When the feeder 3 is cleaned, the powder discharging valve 2 is closed, the feeder cleaning valve 28 is opened, compressed air is fed into the feeder 3 through the feeder cleaning circuit, and the residual coal dust in the feeder 3 is cleaned.
When the weighing device is cleaned, the electronic balance cleaning valve 25 is opened, and compressed air is sent to the sealing gas ring 19 through the electronic balance cleaning loop, so that a small amount of coal dust at the sealing gas ring 19 can be removed, and the coal dust or dust can be further prevented from entering the sealing cover of the weighing device.
When cleaning the classifier, the cleaning valve 23 is opened; meanwhile, the powder inlet valve 8 of the screening device is closed, and the powder feeder 3 and the screening device are isolated. Compressed air enters the screening device through the cleaning loop, and coal dust in the screening device is cleaned.
The pulverized coal fineness on-line detection equipment of the embodiment is realized by combining high-precision weighing and cleaning through the principle of aerodynamic negative pressure separation.
The method comprises the steps that coal dust in a primary air pipe falls into a powder feeder through an automatic sampler, the powder feeder controls the weight of the lower powder, the coal dust falls into a sieve separator, a sealing gland of the sieve separator is loosened after a period of time is stationary, namely a sealing ring at an upper cover and a movable lower cover are separated from a sieve separating net, the total powder is weighed G1, then a push rod is used for pressing the sealing cover of the sieve separator, namely the sealing ring at the upper cover and the movable lower cover, a negative pressure fan is started, negative pressure is generated in the sieve separator, the bottom of the air sieve separator enters and blows up the coal dust on a sieve through a rotating device, a fluidization state is formed, at the moment, the coal dust with fineness smaller than that of a sieve mesh can be sucked out through the negative pressure at the bottom of the sieve mesh, the outlet of the negative pressure fan is returned into the primary air pipe, after a period of time is passed, the negative pressure fan is stopped to operate and is stationary for a period of time, the sealing ring at the upper cover and the movable lower cover are separated from the sieve separating net, and re-weighing is performed to obtain coarse-particle coal dust G2, and R90=G2/G1% is calculated to be 100%. After the detection is finished, the negative pressure fan is started again, the pulverized coal in the system such as the powder feeder, the screen and the like is back-blown and cleaned into the primary air pipe, and after the cleaning is finished, the detection of the fineness of the pulverized coal can be repeated for the next time, and the minimum time of one-time analysis is generally about 15 minutes.
It should be understood that the examples are only for illustrating the present utility model and are not intended to limit the scope of the present utility model. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. The screening and weighing device of the pulverized coal fineness detection equipment is characterized by comprising a screening device and a weighing device; the screening device comprises an upper cover assembly and a movable lower cover (10) which form a sealing cavity with the screening net (4), and the upper cover assembly and the movable lower cover (10) are respectively connected with a driving device for controlling the displacement of the upper cover assembly and the movable lower cover; the weighing device is connected with the separating screen (4) through a connecting rod (15); and during weighing, the upper cover assembly and the movable lower cover (10) are separated from the separating screen (4), and the weighing device respectively obtains the weights of the pulverized coal before and after the separating screen.
2. The screening and weighing device of the pulverized coal fineness detection equipment according to claim 1, further comprising a rotary air knife (14), wherein the rotary air knife (14) is arranged on the inner side of the movable lower cover (10), the negative pressure fan (6) forms a negative pressure environment in the sealed cavity, and the rotary air knife (14) is used for screening fine pulverized coal in a fluidized state.
3. The screening weighing device of the pulverized coal fineness detection equipment according to claim 1 or 2, wherein the upper cover assembly comprises an upper cover (9) and a sealing ring (30), and the upper cover (9) is connected with the screening net (4) through the sealing ring (30).
4. A screening and weighing device of a pulverized coal fineness detection apparatus according to claim 3, characterized in that the driving device comprises an upper push rod (11) and a lower push rod (12); the upper push rod (11) is connected with a sealing ring (30) in the upper cover assembly to drive the sealing ring (30) to move; the lower push rod (12) is connected with the movable lower cover (10) and drives the movable lower cover (10) to move.
5. The screening and weighing device of the pulverized coal fineness detection equipment according to claim 2, wherein a coarse powder return circuit and a fine powder return circuit are arranged between the negative pressure fan (6) and the screening device;
the coarse powder return loop comprises a coarse powder return pipeline connected with an upper cover (9) and a negative pressure fan (6), and a coarse powder cleaning valve (26) is arranged on the coarse powder return pipeline;
the fine powder return loop comprises a fine powder return pipeline connected with the movable lower cover (10) and the negative pressure fan (6), and a fine powder screening valve (27) is arranged on the fine powder return pipeline.
6. The screening and weighing device of the pulverized coal fineness detection equipment according to claim 5, wherein the fine powder return pipe is a spiral hose for absorbing up-and-down displacement of the lower cover (10).
7. The screening weighing device of the pulverized coal fineness detection equipment according to claim 5, wherein the screening device is further provided with a screening device cleaning loop;
the cleaning loop of the screening device sends compressed air into the screening device from the upper cover (9) through a cleaning pipeline, and a cleaning valve (23) is arranged on the cleaning pipeline.
8. A screening and weighing device of a pulverized coal fineness detection apparatus according to claim 1, characterized in that the weighing device comprises an electronic balance (5) and a sealed cover (18); the electronic balance (5) is arranged in the sealing cover (18); the connecting rod (15) is connected with the electronic balance (5) and the separating screen (4) in the sealing cover (18) through a sealing gas ring (19) arranged on the sealing cover (18).
9. The screening and weighing device of the pulverized coal fineness detection equipment according to claim 8, wherein the weighing device further comprises an adjusting block (16) and a balancing block (17); the adjusting block (16) automatically adjusts the position of the sub-screen assembly; the balance weight (17) balances the weight of the split screen assembly.
10. The screening and weighing device of the pulverized coal fineness detection equipment according to claim 8 or 9, wherein the sealing gas ring (19) is connected with an electronic balance cleaning pipeline, and the electronic balance cleaning pipeline is provided with an electronic balance cleaning valve (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322303102.8U CN220729938U (en) | 2023-08-25 | 2023-08-25 | Screening and weighing device of pulverized coal fineness detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322303102.8U CN220729938U (en) | 2023-08-25 | 2023-08-25 | Screening and weighing device of pulverized coal fineness detection equipment |
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| Publication Number | Publication Date |
|---|---|
| CN220729938U true CN220729938U (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322303102.8U Active CN220729938U (en) | 2023-08-25 | 2023-08-25 | Screening and weighing device of pulverized coal fineness detection equipment |
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| Country | Link |
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| CN (1) | CN220729938U (en) |
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2023
- 2023-08-25 CN CN202322303102.8U patent/CN220729938U/en active Active
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