CN214745695U - A furnace heavy metal control system suitable for circulating fluidized bed boiler - Google Patents
A furnace heavy metal control system suitable for circulating fluidized bed boiler Download PDFInfo
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- CN214745695U CN214745695U CN202120594309.3U CN202120594309U CN214745695U CN 214745695 U CN214745695 U CN 214745695U CN 202120594309 U CN202120594309 U CN 202120594309U CN 214745695 U CN214745695 U CN 214745695U
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- furnace
- heavy metal
- fluidized bed
- circulating fluidized
- control system
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 32
- 239000003814 drug Substances 0.000 claims abstract description 32
- 239000000428 dust Substances 0.000 claims abstract description 21
- 239000003463 adsorbent Substances 0.000 claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 9
- 230000007613 environmental effect Effects 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims abstract description 5
- 238000002309 gasification Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003546 flue gas Substances 0.000 abstract description 8
- 238000007599 discharging Methods 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000010881 fly ash Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 241000270708 Testudinidae Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 231100000693 bioaccumulation Toxicity 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treating Waste Gases (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model discloses a heavy metal control system in stove suitable for circulating fluidized bed boiler, including the medicine storehouse that is used for saving the adsorbent, the bottom export in medicine storehouse is connected to furnace's bottom through stokehold pipeline and stove back pipeline respectively, furnace's upper portion one side is connected to cyclone, cyclone's bottom is connected to stove back pipeline, cyclone's top is connected to the afterbody flue, the exit end of afterbody flue is connected with environmental protection discharging equipment, furnace's top is connected to environmental protection dust collector, furnace's bottom still is provided with slag removal system and coal feeding system. The utility model discloses can effectively reduce the heavy metal concentration of thermal power plant emission flue gas.
Description
Technical Field
The utility model relates to a heavy metal adsorption field, concretely relates to heavy metal control system in stove suitable for circulating fluidized bed boiler.
Background
Heavy metals are secondary dust and SO due to characteristics of mobility, bioaccumulation, high harmfulness and the like2And NOxThe fourth largest pollutant of the following coal burning is gradually a focus of attention in recent years. Arsenic, selenium and lead elements in coal are heated and volatilized into gaseous heavy metals, the gaseous heavy metals can perform homogeneous reaction with smoke components and further perform morphological change, meanwhile, the gaseous heavy metals can also generate granular heavy metals through heterogeneous reaction with inorganic minerals and other processes, and part of the heavy metals are finally discharged into the atmosphere in the form of fine particles and gas-phase free states, so that environmental pollution is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a heavy metal control system in stove suitable for circulating fluidized bed boiler to overcome the defect that prior art exists, the utility model discloses can effectively reduce the heavy metal concentration of thermal power plant emission flue gas.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a heavy metal control system in stove suitable for circulating fluidized bed boiler, is including the medicine storehouse that is used for saving the adsorbent, and the bottom export in medicine storehouse is connected to the bottom of furnace through stokehold pipeline and after-furnace pipeline respectively, upper portion one side of furnace is connected to cyclone, cyclone's bottom is connected to after-furnace pipeline, cyclone's top is connected to the afterbody flue, the exit end of afterbody flue is connected with environmental protection discharging equipment, furnace's top is connected to environmental protection dust collector, furnace's bottom still is provided with slag discharge system and coal feed system.
Further, the bottom outlet of the medicine bin is connected to a conveying pipeline through a rotary feeding device, and the conveying pipeline is connected to a furnace front conveying pipeline and a furnace rear conveying pipeline respectively.
Further, the rotary feeding device adopts a star-shaped feeding machine or an impeller feeding machine.
Further, still include the fan, the exit end of fan is provided with the tee bend, the export of tee bend is connected to the bottom awl fill of pipeline and medicine storehouse respectively.
Furthermore, a gasification device is arranged on the inner side of the conical hopper at the bottom of the medicine bin in the circumferential direction and is connected with one outlet of the tee joint.
Furthermore, the inlet and the two outlets of the tee joint are provided with control valves, and the three control valves jointly form a control valve group.
Furthermore, the inner sides of the conveying pipeline, the furnace front conveying pipeline and the furnace rear conveying pipeline are all provided with an anti-abrasion layer.
Further, a dust remover is arranged at the top of the medicine bin.
Furthermore, the bottom of the cyclone separator is connected with a material returning device, and the material returning device is connected to a furnace rear conveying pipeline.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses send into circulating fluidized bed boiler furnace with the heavy metal adsorbent, the adsorption reunion effect through the adsorbent effectively reduces the heavy metal content in the flue gas, reduces coal fired power plant to atmospheric environment's pollution, but this system make full use of circulating fluidized bed boiler burning time is long, advantages such as combustion temperature is stable combine the heavy metal adsorption desorption principle, reduce the heavy metal content in the flue gas, make coal fired power plant provide more clean reliable green electric power.
Furthermore, in order to prevent the adsorbent from adhering to the conical hopper at the bottom of the medicine bin and hindering the normal feeding of the adsorbent, a gasification device is added at the conical hopper position of the medicine bin, and an air source of the gasification device is provided by a fan and is adjusted by a control valve set.
Further, in order to fill the adsorbent into the medicine bin conveniently, a dust remover is installed at the top of the medicine bin, the dust remover is opened before medicine adding, and pressurized air in the medicine bin is discharged from the dust remover.
Furthermore, because the adsorbent is a dusty solid, the pipeline abrasion prevention problem needs to be paid attention to in the pneumatic transmission process, and pipeline abrasion prevention designs such as a tortoise shell type design and a back-applied elbow are added.
Furthermore, the cyclone separator can effectively supplement and collect fly ash in the flue gas and send the fly ash back to the hearth for combustion through the material returning device, and the reaction efficiency of the adsorbent can be directly improved.
Drawings
Fig. 1 is a schematic diagram of a furnace internal heavy metal control system suitable for a circulating fluidized bed boiler.
The system comprises a fan 1, a medicine bin 2, a rotary feeding device 3, a coal feeding system 4, a hearth 5, a cyclone separator 6, a tail flue 7, a control valve group 8, a gasification device 9, a dust remover 10, a slag discharging system 11, a furnace front conveying pipeline 12 and a furnace rear conveying pipeline 13.
Detailed Description
The following describes embodiments of the present invention in further detail:
through research, the utility model provides a heavy metal control system in stove suitable for circulating fluidized bed boiler, see figure 1, including the medicine storehouse 2 that is used for storing adsorbent, the bottom export of medicine storehouse 2 is connected to the pipeline through rotatory feeder 3, the pipeline is connected to the bottom of furnace 5 through stokehold pipeline 12 and after-furnace pipeline 13 respectively, rotatory feeder 3 adopts star type batcher or impeller feeder, still includes fan 1, the exit end of fan 1 is provided with the tee bend, the export of tee bend is connected to the pipeline and the bottom cone bucket of medicine storehouse 2 respectively, the inboard circumference of the bottom cone bucket of medicine storehouse 2 is provided with gasification equipment 9, gasification equipment 9 with an exit linkage of tee bend, tee bend entry and two exports all are provided with control flap, and three control flap constitutes control flap group 8 jointly, upper portion one side of furnace 5 is connected to cyclone 6, cyclone 6's bottom is connected to conveyer pipe 13 behind the stove through the returning charge device, cyclone 6's top is connected to afterbody flue 7, the exit end of afterbody flue 7 is connected with environmental protection discharging equipment, furnace 5's top is connected to environmental protection dust collector, furnace 5's bottom still is provided with slag discharge system 11 and coal feeding system 4, conveyer pipe, preceding conveyer pipe 12 of stove and 13 inboards of conveyer pipe all are provided with the wearing layer, the top of medicine storehouse 2 is provided with dust remover 10.
The following embodiments are used to further describe the implementation process of the present invention in detail:
(1) the adsorbent is stored in the medicine bin 2 and is delivered to the conveying pipeline by the bottom rotary feeding device 3 under the action of gravity;
(2) the absorbent dust is sent to a circulating fluidized bed boiler hearth 5 in a pneumatic conveying mode by taking a fan 1 as a power source;
(3) after the adsorption reaction in the hearth 5, the mixture is sent to a tail environment-friendly discharge device through a cyclone separator 6 and a tail flue 7.
The step (1) specifically comprises the following steps:
(1-1) in order to prevent the adsorbent from adhering to a conical hopper at the bottom of the medicine bin 2 and prevent the adsorbent from normally feeding, a gasification device 9 is added at the position of the conical hopper of the medicine bin, an air source of the gasification device 9 is provided by a fan 1, and the air flow is adjusted by a control valve group 8;
(1-2) the rotary feeding device 3 can adopt a star-shaped feeding machine or a vane feeding machine;
(1-3) in order to conveniently fill the adsorbent into the medicine bin 2, a dust remover 10 is installed at the top of the medicine bin 2, the dust remover 10 is opened before medicine adding, and pressurized air in the medicine bin 2 is discharged from the dust remover 10;
(1-4) feeding can be carried out by pouring feeding through an opening at the top part or by adopting pneumatic conveying of a powder tank truck;
the step (2) specifically comprises the following steps:
(2-1) the coal-fired boiler is provided with factory compressed air, instrument compressed air or other high-pressure fluidizing gas, if the device can directly utilize the original gas source of the boiler, a fan can be omitted, only the quality of the gas source needs to be noticed, a large amount of water cannot be carried in the air, and a drying device can be additionally arranged behind the fan for carrying out corresponding dehumidification;
(2-2) the temperature ranges of the flue gas of the circulating fluidized bed boiler hearth 5 and the cyclone separator 6 are 800-1000 ℃, and the polymerization reaction temperature of the adsorbent and the heavy metal is 700-1000 ℃, so that the adsorbent can be directly fed into the hearth 5 through a stokehole conveying pipeline 12, and can also be fed into the hearth 5 through a material returned after being supplemented with the cyclone separator 6 through a stokehole conveying pipeline 13;
(2-3) because the adsorbent is a dusty solid, the pipeline abrasion prevention problem needs to be paid attention to in the pneumatic conveying process, and pipeline abrasion prevention designs such as a tortoise shell type design and a back application elbow are added.
The step (3) specifically includes:
(3-1) the adsorbent can effectively capture free heavy metal gas and dust in the flue gas, particles which can be supplemented are formed through adsorption and aggregation, and the particles are supplemented through an original environment-friendly dust removal device of a coal-fired power plant, such as a bag-type dust remover, an electric dust remover or an electric bag dust remover, so that the particles are effectively prevented from being directly discharged into the atmospheric environment;
(3-2) the cyclone separator 6 can effectively supplement and collect the fly ash in the flue gas and send the fly ash back to the hearth for combustion through the material returning device, and the reaction efficiency of the adsorbent can be directly improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594309.3U CN214745695U (en) | 2021-03-23 | 2021-03-23 | A furnace heavy metal control system suitable for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594309.3U CN214745695U (en) | 2021-03-23 | 2021-03-23 | A furnace heavy metal control system suitable for circulating fluidized bed boiler |
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| Publication Number | Publication Date |
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| CN214745695U true CN214745695U (en) | 2021-11-16 |
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| CN202120594309.3U Active CN214745695U (en) | 2021-03-23 | 2021-03-23 | A furnace heavy metal control system suitable for circulating fluidized bed boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856395A (en) * | 2021-03-23 | 2021-05-28 | 中国华能集团清洁能源技术研究院有限公司 | System and method for controlling heavy metal in furnace suitable for circulating fluidized bed boiler |
| CN114623440A (en) * | 2022-03-10 | 2022-06-14 | 国家能源集团宁夏煤业有限责任公司 | Circulating ash supply device and circulating fluidized bed boiler system |
-
2021
- 2021-03-23 CN CN202120594309.3U patent/CN214745695U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856395A (en) * | 2021-03-23 | 2021-05-28 | 中国华能集团清洁能源技术研究院有限公司 | System and method for controlling heavy metal in furnace suitable for circulating fluidized bed boiler |
| CN114623440A (en) * | 2022-03-10 | 2022-06-14 | 国家能源集团宁夏煤业有限责任公司 | Circulating ash supply device and circulating fluidized bed boiler system |
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