CN204063016U - A kind of electrostatic field takes off the fluidized system that sodium prevents boiler heating surface from staiing - Google Patents
A kind of electrostatic field takes off the fluidized system that sodium prevents boiler heating surface from staiing Download PDFInfo
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- CN204063016U CN204063016U CN201420461701.0U CN201420461701U CN204063016U CN 204063016 U CN204063016 U CN 204063016U CN 201420461701 U CN201420461701 U CN 201420461701U CN 204063016 U CN204063016 U CN 204063016U
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- electrode plate
- fluid bed
- electrostatic field
- heating surface
- alkali metal
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 230000005686 electrostatic field Effects 0.000 title claims abstract description 23
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 14
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 14
- 239000011734 sodium Substances 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 239000003245 coal Substances 0.000 claims description 41
- 239000007789 gas Substances 0.000 claims description 10
- 239000010883 coal ash Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 17
- 150000001340 alkali metals Chemical class 0.000 abstract description 17
- 229910001413 alkali metal ion Inorganic materials 0.000 abstract description 16
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 238000013508 migration Methods 0.000 abstract description 5
- 230000005012 migration Effects 0.000 abstract description 5
- 238000012546 transfer Methods 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 3
- 238000011109 contamination Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000010884 boiler slag Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- XURIQWBLYMJSLS-UHFFFAOYSA-N 1,4,7,10-tetrazacyclododecan-2-one Chemical compound O=C1CNCCNCCNCCN1 XURIQWBLYMJSLS-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model relates to a kind of electrostatic field and takes off the fluidized system that sodium prevents boiler heating surface from staiing, the inwall both sides in fluid bed burner hearth stage casing are respectively equipped with cathode electrode plate and anode electrode plate, the position of cathode electrode plate and anode electrode plate is corresponding in the horizontal direction, and cathode electrode plate is provided with sieve and silica-sesquioxide layer; This system arranges electrostatic field and sieve and silica-sesquioxide layer in burner hearth, the migration being accelerated alkali metal ion by electrostatic field carries out enrichment to alkali metal ion, with sieve and silica-sesquioxide layer, chemisorbed is carried out to alkali metal ion, reduce the alkali metal content in fluidized bed combustion flue gas, decrease Boiler Convection Heating Surface to stain, improve the heat exchange efficiency of heat-transfer surface, stablize boiler output, make fluid bed can Effec-tive Function; Utilize sieve and silica-sesquioxide layer to carry out chemisorbed to alkali metal ion, alkali-metal removing synchronously is carried out with collecting, is convenient to follow-up alkali metal treated.
Description
Technical field
The utility model relates to the correlation technique that boiler heating surface stains, and is specially a kind of electrostatic field and takes off the fluidized system that sodium prevents boiler heating surface from staiing.
Background technology
China's power industry is based on thermal power generation, and thermoelectricity installed capacity is more than more than 70%.Combustion technology of circulating fluidized has the advantages such as pollution-co ntrol cost is cheap, suitability of fuel is wide, load regulation range is large, when using high alkalinity coal, be present in the alkali compounds in coal, can evaporate in combustion, easily condense in ash deposition boiler heating surface being formed sintering or bonding, cause the burn into slag and fouling problem of the equipment of boiler heating surface.Slagging scorification and contamination can reduce the heat transfer efficiency of boiler, affect boiler output, the safety in operation of equipment seriously being reduced, may cause the major accidents such as burner hearth is flame-out, booster, unplanned blowing out when slagging scorification is serious, is affect one of major issue that station boiler normally runs for a long time.
In order to prevent the various problems because slag and fouling brings, Chinese scholars has carried out large quantifier elimination to the mechanism of slag and fouling, research shows that slag and fouling is complicated physical-chemical reaction process, ash erosion is a complicated physical and chemical process, it is again a dynamic process, both relevant with fuel characteristic, also relevant with service condition with the structure of boiler.Scholar proposes multiple slagging scorification and judges index, but these slagging scorification judge that index has significant limitation in actual application, can only judge fundamentally to solve the harm problem of staiing boiler as preliminary.For high alkalinity coal, due to the volatilization of alkali metal in coal, easily form one deck bottoming attachment in boiler heating surface condensation, bottoming owner will exist with sodium chloride or sodium sulphate form.After mentioned component volatilizees in high temperature environments, easily condense in ash deposition convection heating surface being formed sintering or bonding, along with attachment is to the suction-operated of flying dust, convection heating surface appearance contamination phenomenon in various degree can be made, and pollutant cannot use soot blower to remove, thus cause heating surface heat-transfer capability to decline, cause the problems such as exhaust gas temperature rising, finally make burner hearth exert oneself greatly reduce cause blowing out.
Domesticly utilize high alkalinity coal also to lack engineering operation experience for burning, only Xinjiang region individual power plants is at research high alkalinity burning of coal contamination problems, does not effectively utilize way at present.By optimizing boiler combustion mode, control the temperature in burner hearth and burn to slow down the clogging problems of boiler, convenient operation is not promoted yet in practice.The mode of mixing burning by outer coal is only had to alleviate contamination problems, carry out mixing burning after utilizing accurate eastern coal to mix with other coal, the ratio of Boiler Mixed Burning high alkalinity coal should more than 30%, when mixed-fuel burning proportion increases, the convection heating surface of boiler stains dust stratification seriously, and the bulk material corrosion of alkali metal to boiler is simultaneously also very serious.Because Xinjiang region high alkalinity coal utilization mode mostly is electric power stations near coal-mines, the demand of mixing external coal during burning is comparatively large, and the eastern coal use amount of aligning is very limited like this, simultaneously coal-fired from other local purchase high-quality again, adds the cost of electricity-generating of electricity power enterprise.The construction of the exploitation and power supply base of aiming at eastern coalfield brings difficulty, is difficult to the advantage of eastern for standard coal to be given full play to, and brings very large difficulty to the design and working of pulverized-coal fired boiler simultaneously.Therefore, during boiler pure burning high alkalinity coal, the contamination of convection heating surface is problem demanding prompt solution.
Utility model content
The purpose of this utility model is to provide a kind of electrostatic field and takes off the fluidized system that sodium prevents boiler heating surface from staiing, solve existing station boiler convection heating surface contamination problems, reduce boiler heating surface and arrange difficulty, ensure the abundant heat exchange of boiler heating surface, stablize boiler output, can avoid, owing to staiing the convection heating surface overheating problem caused, greatly reducing the generation of pipe explosion accident, the extensive pure burning achieving high alkalinity coal utilizes, and does not affect boiler combustion efficiency simultaneously.
The technical solution of the utility model is as follows:
A kind of electrostatic field takes off the fluidized system that sodium prevents boiler heating surface from staiing, it is characterized in that: comprise fluid bed, the inwall both sides in the burner hearth stage casing of fluid bed are respectively equipped with cathode electrode plate and anode electrode plate, the position of cathode electrode plate and anode electrode plate is corresponding in the horizontal direction, and described cathode electrode plate is provided with again sieve and silica-sesquioxide layer.
Upper end, described fluid bed side is provided with coal ash and smoke mixture outlet, and coal ash and smoke mixture outlet are connected to cyclone separator.
The exhanst gas outlet at described cyclone separator top is connected to answers blower fan, and flue gas is discharged by air-introduced machine, and the coal ash outlet bottom cyclone separator is connected to material returning device, turns back to the burning of fluid bed Inner eycle by material returning device.
The lower end, side of described fluid bed is provided with charging gear, and charging gear comprises coal bunker and dispenser, and coal bunker is connected to dispenser, and dispenser is connected to fluid bed, for sending into raw coal.
The bottom of described fluid bed is connected with air blast, sends air burning outside by air blast, and bottom is also provided with slag bath simultaneously.
The course of work of this system is as follows:
In boiler start-up, first can mix burning mode by coal beyond coal bunker, dispenser and send into fluid bed and burn, until boiler starts normally to run after furnace temperature reaches uniform temperature, then high alkalinity coal is sent into fluid bed by coal bunker, dispenser burn.Boiler normal operating phase, high alkalinity coal is burnt in the burner hearth of fluid bed by coal bunker, dispenser and the air from air blast.During burning and burning after flue gas be in high temperature, at high temperature alkali metal is in ionic state, and in the electrostatic field be made up of cathode electrode plate and anode electrode plate, alkali metal ion is to cathodic migration.Run into sieve and silica-sesquioxide layer in the process of alkali ion movement, at high temperature alkali metal ion and sieve and silica-sesquioxide generation chemisorbed, make alkali metal ion be fixed, and realizes alkali metal shifting out from burner hearth by changing or upgrading sieve and silica-sesquioxide layer.After the dealkalize metal system be made up of electrostatic field and sieve and silica-sesquioxide layer, the alkali metal content in flue gas significantly reduces.Carry out gas solid separation containing a small amount of alkali-metal combustion product gases through cyclone separator, gas enters chimney through air-introduced machine after lowering the temperature in flue, and solid particle returns in the burner hearth of fluid bed through material returning device and burns.Boiler slag removal carries out at fluidized-bed bottom.
High alkalinity coal the discharged alkali metal that carries out burning in fluid bed burner hearth is adsorbed in a large number, is removed in the dealkalize metal system be made up of electrostatic field and sieve and silica-sesquioxide layer, active sodium content in flue gas reduces greatly, few at sodium content active in subsequent thermal face is due to flue gas, substantially do not stain.
The utility model has following beneficial effect:
(1) electrostatic field and sieve and silica-sesquioxide layer are set in fluid bed burner hearth, the migration being accelerated alkali metal ion by electrostatic field carries out enrichment to alkali metal ion, with sieve and silica-sesquioxide layer, chemisorbed is carried out to alkali metal ion, reduce the alkali metal content in fluidized bed combustion flue gas, decrease Boiler Convection Heating Surface to stain, improve the heat exchange efficiency of heat-transfer surface, stablize boiler output;
(2) electrostatic field and sieve and silica-sesquioxide layer is utilized to carry out chemisorbed to alkali metal ion in fluid bed burner hearth, change very little to fluid bed, fluid bed can be run under efficient, system capacity utilization ratio is not almost affected, avoids high alkalinity coal simultaneously and can only utilize by mixing burning approach the great number cost brought at present;
(3) use electrostatic field to accelerate the migration of alkali metal ion, with sieve and silica-sesquioxide layer, chemisorbed is carried out to alkali metal ion, alkali-metal removing synchronously is carried out with collecting, is convenient to follow-up alkali metal treated;
(4) native system directly can be transformed in conventional boiler, and reforming technology is simple, and improvement cost is low, easily can realize the extensive pure burning of high alkalinity coal and utilize, improve the benefit of power plant.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, Reference numeral is: 1 coal bunker, 2 dispensers, 3 air blasts, 4 fluid beds, 5 cathode electrode plates, 6 anode electrode plates, 7 sieve and silica-sesquioxide layers, 8 cyclone separators, 9 material returning devices, 10 air-introduced machines.
Detailed description of the invention
As shown in Figure 1, a kind of electrostatic field takes off the fluidized system that sodium prevents boiler heating surface from staiing, the inwall both sides in the burner hearth stage casing of fluid bed 4 are respectively equipped with cathode electrode plate 5 and anode electrode plate 6, the position of cathode electrode plate 5 and anode electrode plate 6 is corresponding in the horizontal direction, and described cathode electrode plate 5 is provided with again sieve and silica-sesquioxide layer 7.
Upper end, described fluid bed 4 side is provided with coal ash and smoke mixture outlet, and coal ash and smoke mixture outlet are connected to cyclone separator 8.
The exhanst gas outlet at described cyclone separator 8 top is connected to answers blower fan, and flue gas is discharged by air-introduced machine 10, and the coal ash outlet bottom cyclone separator 8 is connected to material returning device 9, turns back to the burning of fluid bed 4 Inner eycle by material returning device 9.
The lower end, side of described fluid bed 4 is provided with charging gear, and charging gear comprises coal bunker 1 and dispenser 2, and coal bunker 1 is connected to dispenser 2, and dispenser 2 is connected to fluid bed 4, for sending into raw coal.
The bottom of described fluid bed 4 is connected with air blast 3, sends air burning outside by air blast 3, and bottom is also provided with slag bath simultaneously.
The course of work of this system is as follows:
In boiler start-up, can first by coal bunker 1, coal be mixed burning mode and is sent into fluid bed 4 and burn beyond dispenser 2, until boiler starts normally to run after furnace temperature reaches uniform temperature, then high alkalinity coal is sent into fluid bed 4 by coal bunker 1, dispenser 2 burn.Boiler normal operating phase, high alkalinity coal is burnt with the air from air blast 3 by coal bunker 1, dispenser 2 in the burner hearth of fluid bed 4.During burning and burning after flue gas be in high temperature, at high temperature alkali metal is in ionic state, and in the electrostatic field be made up of cathode electrode plate 5 and anode electrode plate 6, alkali metal ion is to cathodic migration.Run into sieve and silica-sesquioxide layer 7 in the process of alkali ion movement, at high temperature alkali metal ion and sieve and silica-sesquioxide generation chemisorbed, make alkali metal ion be fixed, and realizes alkali metal shifting out from burner hearth by changing or upgrading sieve and silica-sesquioxide layer.After the dealkalize metal system be made up of electrostatic field and sieve and silica-sesquioxide layer, the alkali metal content in flue gas significantly reduces.Carry out gas solid separation containing a small amount of alkali-metal combustion product gases through cyclone separator 8, gas enters chimney through air-introduced machine 10 after lowering the temperature in flue, and solid particle returns in the burner hearth of fluid bed 4 through material returning device 9 and burns.Boiler slag removal carries out bottom fluid bed 4.
Claims (5)
1. an electrostatic field takes off the fluidized system that sodium prevents boiler heating surface from staiing, it is characterized in that: comprise fluid bed (4), the inwall both sides in the burner hearth stage casing of fluid bed (4) are respectively equipped with cathode electrode plate (5) and anode electrode plate (6), the position of cathode electrode plate (5) and anode electrode plate (6) is corresponding in the horizontal direction, described cathode electrode plate (5) is provided with again sieve and silica-sesquioxide layer (7).
2. electrostatic field according to claim 1 takes off the fluidized system that sodium prevents boiler heating surface from staiing, it is characterized in that: described fluid bed (4) upper end, side is provided with coal ash and smoke mixture outlet, coal ash and smoke mixture outlet are connected to cyclone separator (8).
3. electrostatic field according to claim 2 takes off the fluidized system that sodium prevents boiler heating surface from staiing, it is characterized in that: the exhanst gas outlet at described cyclone separator (8) top is connected to answers blower fan, flue gas is discharged by air-introduced machine (10), the coal ash outlet of cyclone separator (8) bottom is connected to material returning device (9), and material returning device (9) is connected to fluid bed (4).
4. electrostatic field according to claim 1 takes off the fluidized system that sodium prevents boiler heating surface from staiing, it is characterized in that: the lower end, side of described fluid bed (4) is provided with charging gear, charging gear comprises coal bunker (1) and dispenser (2), coal bunker (1) is connected to dispenser (2), and dispenser (2) is connected to fluid bed (4).
5. electrostatic field according to claim 1 takes off the fluidized system that sodium prevents boiler heating surface from staiing, and it is characterized in that: the bottom of described fluid bed (4) is connected with air blast (3), and bottom is also provided with slag bath simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420461701.0U CN204063016U (en) | 2014-08-15 | 2014-08-15 | A kind of electrostatic field takes off the fluidized system that sodium prevents boiler heating surface from staiing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420461701.0U CN204063016U (en) | 2014-08-15 | 2014-08-15 | A kind of electrostatic field takes off the fluidized system that sodium prevents boiler heating surface from staiing |
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| CN204063016U true CN204063016U (en) | 2014-12-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109958989A (en) * | 2019-04-03 | 2019-07-02 | 李剑 | A kind of boiler evaporating device for steam power plant |
| CN110545907A (en) * | 2017-04-25 | 2019-12-06 | 宾哈利姆拉希普·阿明 | Reaction chamber for exothermic and endothermic reactions |
-
2014
- 2014-08-15 CN CN201420461701.0U patent/CN204063016U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545907A (en) * | 2017-04-25 | 2019-12-06 | 宾哈利姆拉希普·阿明 | Reaction chamber for exothermic and endothermic reactions |
| CN110545907B (en) * | 2017-04-25 | 2022-05-17 | 宾哈利姆拉希普·阿明 | Reaction chamber for exothermic and endothermic reactions |
| CN109958989A (en) * | 2019-04-03 | 2019-07-02 | 李剑 | A kind of boiler evaporating device for steam power plant |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180504 Address after: 610000 18 West core road, hi-tech West District, Chengdu, Sichuan Patentee after: Dongfang Electric Co., Ltd. Address before: 610036 Shu Han Road, Jinniu District, Chengdu, Sichuan Province, No. 333 Patentee before: Dongfang Electric Corporation |
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| TR01 | Transfer of patent right |