CN212841550U - Novel low-nitrogen circulating fluidized bed boiler - Google Patents
Novel low-nitrogen circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN212841550U CN212841550U CN202021133729.3U CN202021133729U CN212841550U CN 212841550 U CN212841550 U CN 212841550U CN 202021133729 U CN202021133729 U CN 202021133729U CN 212841550 U CN212841550 U CN 212841550U
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- China
- Prior art keywords
- tower module
- boiler
- relative position
- type water
- fluidized bed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 10
- 239000012528 membrane Substances 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 15
- 238000001816 cooling Methods 0.000 abstract description 8
- 238000004939 coking Methods 0.000 abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model discloses a novel low nitrogen circulating fluidized bed boiler, including boiler tower module, boiler tower module is hollow structure, the inside diaphragm type water-cooled furnace that is equipped with of boiler tower module, diaphragm type water-cooled furnace bottom relative position is equipped with the coal feeding device, diaphragm type water-cooled furnace bottom is equipped with combustion system, the combustion system top is equipped with the wind cap once, wind cap top relative position is equipped with the overgrate air system once, diaphragm type water-cooled furnace upper portion relative position is equipped with the water-cooling screen, boiler tower module right side is equipped with the material reversing system, material reversing system bottom and diaphragm type water-cooled furnace intercommunication, material reversing system right side is equipped with tail gas treatment tower module, the inside from the top down of tail gas treatment tower module is equipped with high temperature over heater in proper order, the low temperature over heater, the economizer. The utility model has the advantages that: the problems of insufficient load, high temperature of a hearth outlet, serious coking, high discharge amount of nitrogen oxides and low temperature of a superheater of the traditional circulating fluidized bed boiler can be solved.
Description
Technical Field
The utility model belongs to the technical field of the boiler, concretely relates to novel low-nitrogen circulating fluidized bed boiler.
Background
Circulating fluidized bed boiler is common boiler type, and traditional small-size and medium-size circulating fluidized bed boiler operation several years back usually has the load not enough, and furnace exit temperature is on the high side, and the coking is serious, and nitrogen oxide discharge capacity is high, and boiler exhaust gas temperature is on the high side, the problem that the over heater temperature is on the low side, for this reason, people are looking for the solution always.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel low-nitrogen circulating fluidized bed boiler can solve traditional circulating fluidized bed boiler ubiquitous load not enough, and furnace exit temperature is on the high side, and the coking is serious, and nitrogen oxide discharge capacity is high, the problem that the over heater temperature is on the low side.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a novel low-nitrogen circulating fluidized bed boiler comprises a boiler tower module, wherein the boiler tower module is of a hollow structure, a membrane type water-cooling hearth is arranged inside the boiler tower module, a coal feeding device is arranged at the bottom relative position of the membrane type water-cooling hearth, a combustion system is arranged at the bottom of the membrane type water-cooling hearth, a primary air cap is arranged at the top of the combustion system, a secondary air system is arranged at the top relative position of the primary air cap, a water-cooling screen is arranged at the upper relative position of the membrane type water-cooling hearth, a material reversing system is arranged on the right side of the boiler tower module, the bottom of the material reversing system is communicated with the membrane type water-cooling hearth, a connecting channel is arranged at the top relative position of the boiler tower module, the material reversing system is communicated with the boiler tower module through the connecting channel, a cyclone separator is arranged at the top relative position of the material, and a high-temperature superheater, a low-temperature superheater, an economizer and an air preheater are sequentially arranged in the tail gas treatment tower module from top to bottom.
Further, the boiler tower module, the tail gas treatment tower module and the outer side of the material returning system are all provided with steel structures.
Furthermore, a desuperheater is arranged at the opposite position outside the tail gas treatment tower module and is used for communicating the high-temperature superheater with the low-temperature superheater.
Further, the cyclone separator is vertically arranged, and the diameter of the top of the cyclone separator is larger than that of the bottom of the cyclone separator.
Further, the air preheater is connected with subsequent environment-friendly equipment for desulfurization, dust removal and the like.
Compared with the prior art, the beneficial effects of the utility model are that:
in the utility model, a primary air cap and a secondary air system are arranged in a boiler tower module, a graded air supply mode is adopted, the primary air volume is reduced, the secondary air volume is improved, a dense phase region adopts oxygen-poor combustion, a dilute phase region adopts oxygen-enriched combustion, and the excess air coefficient is reduced, so that the generation of nitrogen oxide is reduced, and the secondary air in the middle of a hearth is increased, so that carbon monoxide generated in the oxygen-poor combustion process can be fully burned out in the middle of the hearth; the water cooling screen is arranged in the boiler tower module, so that the radiant heating area of the boiler is greatly increased, the load of the boiler is guaranteed, the temperature of flue gas at the outlet of a hearth is reduced, the generation of nitrogen oxides is reduced, and the risk of overtemperature coking of the boiler is reduced; the cyclone separator is arranged at the outlet of the connecting channel, so that particles in the flue gas are separated, the cross section area of the inlet of the cyclone separator is reduced, the flow speed of the inlet of the cyclone separator is improved, the height of the cyclone separator is increased, the separation time is prolonged, and the separation efficiency is improved; through setting up high temperature over heater and low temperature over heater to increase the heated area of over heater, increase the use amount of alloy steel pipe, improve the regulating power of desuperheater, adopt the mode of two-stage desuperheating when necessary, the adaptability when guaranteeing that the over heater satisfies the lower influence that brings of flue gas temperature and boiler load fluctuation when the low nitrogen burns.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the system comprises a coal supply device, 2 a combustion system, 3 a membrane type water-cooled hearth, 4 a water-cooled screen, 5 a material returning system, 6 a high-temperature superheater, 7 a desuperheater, 8 a low-temperature superheater, 9 a coal economizer, 10 an air preheater, 11 a primary air hood, 12 a secondary air system, 13 a connecting channel, 14 a cyclone separator, 15 a steel structure, 16 a boiler tower module and 17 a tail gas treatment tower module.
Detailed Description
Example (b): as shown in figure 1, the coal feeding device comprises a boiler tower module 16, the boiler tower module 16 is of a hollow structure, a membrane type water-cooled hearth 3 is arranged in the boiler tower module 16, a coal feeding device 1 is arranged at the bottom of the membrane type water-cooled hearth 3 in a relative position, a combustion system 2 is arranged at the bottom of the membrane type water-cooled hearth 3, a primary air cap 11 is arranged at the top of the combustion system 2, a secondary air system 12 is arranged at the top of the primary air cap 11 in a relative position, a water-cooled screen 4 is arranged at the upper portion of the membrane type water-cooled hearth 3 in a relative position, a material returning system 5 is arranged on the right side of the boiler tower module 16, the bottom of the material returning system 5 is communicated with the membrane type water-cooled hearth 3, a connecting channel 13 is arranged at the top of the boiler tower module 16, the material returning system 5 is communicated with the boiler tower module 16 through the connecting channel 13, a cyclone separator 14 is arranged at the top of the, the tail gas treatment tower module 17 is internally provided with a high-temperature superheater 6, a low-temperature superheater 8, an economizer 9 and an air preheater 10 from top to bottom in sequence. Boiler tower module 16, the tail gas treatment tower module 17 all is equipped with steel construction 15 with the anti-material system 5 outside, and the relative position in the tail gas treatment tower module 17 outside is equipped with desuperheater 7, and desuperheater 7 is linked together high temperature over heater 6 and low temperature over heater 8, and cyclone 14 is vertical arranges, and cyclone 14 top diameter is greater than the bottom diameter, and air heater 10 connects environmental protection equipment such as follow-up desulfurization dust removal.
The working process is as follows: the fuel passes through a coal feeding device 1 and enters a dense phase region at the lower part of a membrane type water-cooled hearth 3, oxygen-deficient combustion is firstly carried out under the ignition action of a combustion system 2, partial CO and a large amount of unburnt particulate matters are generated under the oxygen-deficient environment, a secondary air system 12 is started at the moment, the CO and the large amount of unburnt particulate matters are continuously combusted under the afterburning action of the secondary air system 12, high-temperature flue gas and partial granular fuel rise and flow, heat exchange is carried out between the high-temperature flue gas and the side wall of the membrane type water-cooled hearth 3 and a water screen 4, the high-temperature flue gas enters a connecting channel 13 and enters a cyclone separator 14 through the connecting channel 13, smoke and dust in the cyclone separator 14 are separated, the separated granular fuel enters the membrane type water-cooled hearth 3 through a material returning system 5 and is continuously combusted, the separated high-temperature, And the coal economizer 9 and the air preheater 10 enter environment-friendly equipment such as desulfurization and dust removal equipment at the tail part of the boiler for the next circulation until the carbon content of the boiler ash reaches the standard.
Claims (4)
1. A novel low-nitrogen circulating fluidized bed boiler is characterized in that: the coal feeding device comprises a boiler tower module (16), the boiler tower module (16) is of a hollow structure, a membrane type water-cooled hearth (3) is arranged inside the boiler tower module (16), a coal feeding device (1) is arranged at the bottom relative position of the membrane type water-cooled hearth (3), a combustion system (2) is arranged at the bottom of the membrane type water-cooled hearth (3), a primary air cap (11) is arranged at the top of the combustion system (2), a secondary air system (12) is arranged at the top relative position of the primary air cap (11), a water-cooled screen (4) is arranged at the upper relative position of the membrane type water-cooled hearth (3), a material returning system (5) is arranged at the right side of the boiler tower module (16), the bottom of the material returning membrane type system (5) is communicated with the water-cooled hearth (3), a connecting channel (13) is arranged at the top relative position of the boiler tower module (16, cyclone (14) are arranged at the top relative position of the material returning system (5), a tail gas treatment tower module (17) is arranged on the right side of the material returning system (5), the top relative position of the material returning system (5) is communicated with the top relative position of the tail gas treatment tower module (17), and a high-temperature superheater (6), a low-temperature superheater (8), an economizer (9) and an air preheater (10) are sequentially arranged inside the tail gas treatment tower module (17) from top to bottom.
2. The new low nitrogen circulating fluidized bed boiler in accordance with claim 1, characterized by: the boiler tower module (16), the tail gas treatment tower module (17) and the outer side of the material returning system (5) are all provided with steel structures (15).
3. The new low nitrogen circulating fluidized bed boiler in accordance with claim 1, characterized by: a desuperheater (7) is arranged at the outer side opposite position of the tail gas treatment tower module (17), and the high-temperature superheater (6) and the low-temperature superheater (8) are communicated by the desuperheater (7).
4. The new low nitrogen circulating fluidized bed boiler in accordance with claim 1, characterized by: the cyclone separator (14) is vertically arranged, and the diameter of the top of the cyclone separator (14) is larger than that of the bottom of the cyclone separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021133729.3U CN212841550U (en) | 2020-06-18 | 2020-06-18 | Novel low-nitrogen circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021133729.3U CN212841550U (en) | 2020-06-18 | 2020-06-18 | Novel low-nitrogen circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212841550U true CN212841550U (en) | 2021-03-30 |
Family
ID=75173692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021133729.3U Expired - Fee Related CN212841550U (en) | 2020-06-18 | 2020-06-18 | Novel low-nitrogen circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212841550U (en) |
-
2020
- 2020-06-18 CN CN202021133729.3U patent/CN212841550U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210330 |