CN109404897B - Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal - Google Patents
Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal Download PDFInfo
- Publication number
- CN109404897B CN109404897B CN201811420230.8A CN201811420230A CN109404897B CN 109404897 B CN109404897 B CN 109404897B CN 201811420230 A CN201811420230 A CN 201811420230A CN 109404897 B CN109404897 B CN 109404897B
- Authority
- CN
- China
- Prior art keywords
- furnace top
- top reactor
- reactor
- flue gas
- flue
- 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.)
- Active
Links
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 30
- 239000003245 coal Substances 0.000 title claims abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003546 flue gas Substances 0.000 claims abstract description 54
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 231100000719 pollutant Toxicity 0.000 claims description 19
- 238000005192 partition Methods 0.000 claims description 15
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 230000000153 supplemental effect Effects 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 20
- 230000023556 desulfurization Effects 0.000 abstract description 20
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 19
- 239000002351 wastewater Substances 0.000 abstract description 19
- 239000010419 fine particle Substances 0.000 abstract description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000000779 smoke Substances 0.000 description 7
- 239000002956 ash Substances 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000003463 adsorbent Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 230000001502 supplementing effect Effects 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009292 forward osmosis Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
- B01D49/003—Separating dispersed particles from gases, air or vapours by other methods by sedimentation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a pulverized coal boiler with a furnace top reactor for realizing multi-pollutant combined removal, which comprises a hearth, the furnace top reactor and a tail flue; the furnace is internally provided with a front heating surface, a flue gas outlet at the top of the furnace is communicated with an inlet of a furnace top reactor, an outlet of the furnace top reactor is communicated with a tail flue, an inlet nozzle group is arranged at the inlet of the furnace top reactor, and the pulverized coal boiler can strengthen the control of NOx, micron-sized fine particles, heavy metals and desulfurization wastewater.
Description
Technical Field
The invention belongs to the fields of thermal generator sets and environmental protection, and relates to a pulverized coal boiler with a furnace top reactor for realizing multi-pollutant combined removal.
Background
The structure of the primary energy source in China is rich in coal, lean in oil and less in gas, and coal is the basis of the energy source in China. The development of clean and efficient coal-electricity equipment is beneficial to improving the energy utilization efficiency, reducing the emission of pollutants and carbon dioxide, is an important proposition of thermal power structure optimization and technology upgrading, and is a guarantee of sustainable development of the energy industry in China.
Generated by combustion of coalThe flue gas contains a large amount of smoke dust and sulfur dioxide (SO) 2 ) Nitrogen Oxides (NO) X ) Contaminants such as heavy metals are the main sources of emissions of these contaminants. In order to effectively control the pollutants, the national environmental protection department is continuously reducing the limit value of pollutant emission of coal-fired power plants. In the 2011 revised emission Standard of atmospheric pollutants for thermal Power plant (GB 13223-2011), the smoke emission limit of a newly built unit is regulated to be 30mg/Nm 3 ，SO 2 The emission limit was 100mg/Nm 3 ，NO X The emission limit was 100mg/Nm 3 Hg and its compound emission limit were 0.03mg/Nm 3 . For the thermal generator set in the key region, the smoke emission limit is further reduced to 20mg/Nm 3 ，SO 2 The emission limit is reduced to 50mg/Nm 3 。
In recent years, with reference to the emission limit of the natural gas turbine unit under the promotion of the inside of the industry, the coal-fired unit further provides an ultra-low emission concept, namely, smoke dust is further reduced to 5mg/Nm 3 ，SO 2 The discharge is reduced to 35mg/Nm 3 ，NO X The discharge is reduced to 50mg/Nm 3 。
In order to realize the ultra-low emission, a great amount of cost is input into the coal-fired power plant to construct a tail flue gas purification system, but some problems still exist, and the method mainly comprises the following steps:
1) The SCR denitration technology is generally adopted for controlling NOx emission in the coal-fired power plant, the denitration technology has the characteristic of high denitration efficiency, three layers of catalysts are generally adopted at present for realizing ultra-low NOx emission, but if the original NOx concentration is too high, the SCR is very difficult to realize ultra-low NOx emission, and the defects of high investment operation cost, gradual deactivation of the catalysts, the need of replacing the catalysts usually for 3-4 years, high difficulty in harmless treatment after the catalyst is abandoned and the like exist.
2) In order to control smoke emission, an electrostatic precipitator is generally adopted at present, so that very high dust removal efficiency can be achieved, but the removal effect of the electrostatic precipitator on 1 mu m-level fine particulate matters (PM 1.0) can be greatly reduced, and with increasing importance of environment PM2.5 control, the conventional electrostatic precipitator is also difficult to meet the increasingly strict smoke emission requirements.
3) The heavy metal emission is an important part of the coal-fired power plant, the heavy metal emission standard of the coal-fired power plant in China is not strict, and the desulfurization, denitrification and dust removal device of the coal-fired power plant has a synergistic removal effect on the heavy metal, so that the emission limit in China is not difficult to be reached, but the heavy metal emission control is also necessary if the emission standard is according to the emission standard of developed countries such as the United states.
Earlier studies show that the control of pollutants such as NOx, fine particles, heavy metals and the like can be realized by adding different reactants into a boiler, but if the pollutants are directly added into a hearth, the reactants can be destroyed due to the too high temperature of a flame area in the hearth, and the removal of various pollutants can not be realized; a proper temperature window can be selected in the tail flue, but the flue gas temperature is continuously reduced, the residence time is short, the reaction can not be fully performed, and the expected effect can not be achieved.
Besides atmospheric pollutants, desulfurization wastewater is a hot spot and a difficult point in the pollutant treatment of the coal-fired power plant at present, and two technical routes mainly exist at present, wherein one is to prepare industrial salt by evaporation and crystallization through concentration methods such as forward osmosis, reverse osmosis and the like, but the cost is very high; the other is that the waste heat of the flue gas is evaporated to dryness in a tail flue in front of the dust remover and enters the fly ash, so that the technical economy is better, but the temperature of the sprayed flue gas is lower, and the problems of scaling, blockage and the like are caused.
Therefore, the method has very important significance for the coal-fired unit (mainly comprising the pulverized coal boiler), strengthening the control of pollutants such as NOx, micron-sized fine particles, heavy metals, desulfurization wastewater and the like, and even realizing the combined removal of various pollutants through one set of equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the pulverized coal boiler with the furnace top reactor for realizing multi-pollutant combined removal, which can strengthen the control of NOx, micron-sized fine particles, heavy metals and desulfurization wastewater.
In order to achieve the purpose, the pulverized coal boiler with the furnace top reactor for realizing multi-pollutant combined removal comprises a hearth, the furnace top reactor and a tail flue;
the furnace is internally provided with a front heating surface, a flue gas outlet at the top of the furnace is communicated with an inlet of a furnace top reactor, an outlet of the furnace top reactor is communicated with a tail flue, and an inlet nozzle group is arranged at the inlet of the furnace top reactor.
A supplemental nozzle group is arranged at the upstream position of the flue gas in the furnace top reactor.
The cross section of the inlet of the furnace roof reactor is gradually reduced along the flow direction of the flue gas.
The number of inlets of the furnace top reactor is one, and the inlets of the furnace top reactor are positioned at the middle position of the top of the hearth.
The number of inlets of the furnace top reactors is two, wherein the inlets of the two furnace top reactors are respectively positioned at two sides of the top of the hearth and near the side wall, and the reactor partition walls are arranged at the positions of the flue gas upstream and the flue gas midstream in the furnace top reactors.
The number of inlets of the furnace top reactors is two, wherein the inlet of one furnace top reactor is positioned at the side surface of the hearth and near the side wall, the inlet of the other furnace top reactor is positioned at the position near the middle of the top of the hearth, and the reactor partition walls are arranged at the positions of the upstream and the midstream of the flue gas in the furnace top reactor.
The periphery of the hearth is provided with a burner and a burnout air port, and the bottom of the hearth is provided with a slag discharge port.
The flue partition wall, the SCR denitration system and the air preheater are sequentially arranged in the tail flue along the flowing direction of the flue gas, the tail heating surfaces are arranged on two sides of the flue partition wall, the ash discharge port is arranged at the bottom of the tail flue, and the flue outlet is arranged on the side face of the bottom of the tail flue.
And a flue gas baffle is arranged at the outlet of the furnace top reactor.
The inner wall of the furnace top reactor is provided with a heat insulation layer or a heat absorption layer.
The side wall of the inlet of the furnace top reactor is of a flame folding structure, the cross section of the inlet of the furnace top reactor is gradually reduced along the flow direction of the flue gas by the flame folding structure, and the flue gas forms a rotational flow in the furnace top reactor.
The inner wall of the bottom surface of the middle part of the furnace top reactor is inclined downwards along the flow direction of the flue gas.
The invention has the following beneficial effects:
when the pulverized coal boiler with the furnace top reactor for realizing multi-pollutant combined removal is in specific operation, the front heating surface is arranged in the furnace chamber, the furnace top reactor is arranged at the top of the furnace chamber, the flue gas outlet of the furnace top reactor is communicated with the tail flue, the inlet nozzle group is arranged at the inlet of the furnace top reactor, and when the pulverized coal boiler works, the temperature of flue gas is regulated through the front heating surface, denitration reducing agent solution, desulfurization wastewater, fine particle agglomeration agent and heavy metal adsorbent are sprayed into the furnace top reactor through the inlet nozzle group and are mixed with the flue gas in the furnace top reactor for reaction, so that the effective removal of various pollutants such as NOx, fine particles, heavy metal and the like is realized, the utilization of desulfurization wastewater is realized, and the aim of enhancing the control of NOx, micron-sized fine particles, heavy metal and desulfurization wastewater is fulfilled. The desulfurization waste water is quickly evaporated and removed through the high-temperature flue gas, and the problems of scaling, blockage and the like can be effectively avoided due to the higher temperature of the flue gas and the rotational flow of the flue gas.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a cross-sectional view at A in FIG. 1;
FIG. 3 is a schematic diagram of a second embodiment of the present invention;
FIG. 4 is a cross-sectional view at B in FIG. 3;
fig. 5 is a schematic structural diagram of a third embodiment of the present invention.
Fig. 6 is a cross-sectional view at C in fig. 5.
Wherein, 1 is the slag notch, 2 is the combustor, 3 is the furnace, 4 is the burnout wind gap, 5 is the front portion heated surface, 6 is the entry nozzle group, 7 is SCR denitration system, 8 is the furnace roof reactor, 9 is the supplementary nozzle group, 10 is the book flame structure, 11 is the air heater, 12 is the reactor partition wall, 13 is the flue export, 14 is the ash discharge mouth, 15 is the flue gas baffle, 16 is the flue partition wall, 17 is afterbody heated surface, 18 is the afterbody flue.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, the pulverized coal boiler with a furnace top reactor for realizing multi-pollutant combined removal comprises a hearth 3, a furnace top reactor 8 and a tail flue 18; the furnace 3 is internally provided with a front heating surface 5, a flue gas outlet at the top of the furnace 3 is communicated with an inlet of a furnace top reactor 8, an outlet of the furnace top reactor 8 is communicated with a tail flue 18, an inlet nozzle group 6 is arranged at the inlet of the furnace top reactor 8, a supplementing nozzle group 9 is arranged at the position of the flue gas upstream in the furnace top reactor 8, and the cross section of the inlet of the furnace top reactor 8 is gradually reduced along the flow direction of the flue gas.
The periphery of the hearth 3 is provided with a burner 2 and a burnout air port 4, and the bottom of the hearth 3 is provided with a slag discharging port 1; a flue partition wall 16, an SCR denitration system 7 and an air preheater 11 are sequentially arranged in the tail flue 18 along the flow direction of the flue gas, tail heating surfaces 17 are arranged on two sides of the flue partition wall 16, an ash discharge port 14 is arranged at the bottom of the tail flue 18, and a flue outlet 13 is arranged on the side surface of the bottom of the tail flue 18; a flue gas baffle 15 is arranged at the outlet of the furnace top reactor 8.
The inner wall of the furnace top reactor 8 is provided with a heat insulation layer or a heat absorption layer; the side wall of the inlet of the top reactor 8 is provided with a flame folding structure 10, the cross section of the inlet of the top reactor 8 is gradually reduced along the flow direction of the flue gas by the flame folding structure 10, and the flue gas forms a rotational flow in the top reactor 8; the inner wall of the middle bottom surface of the furnace top reactor 8 is inclined downwards along the flow direction of the flue gas.
When the invention specifically works, high-temperature flue gas enters the furnace top reactor 8, meanwhile, denitration reducing agent solution, desulfurization wastewater, fine particulate matter agglomeration agent and heavy metal adsorbent are sprayed into the furnace top reactor 8 through the inlet nozzle group 6 and are mixed with the high-temperature flue gas in the furnace top reactor 8 to react so as to remove various pollutants such as NOx, fine particulate matters and heavy metals in the flue gas, the flue gas output from the outlet of the furnace top reactor 8 flows through the flue gas baffle 15 and the flue partition 16 in a regulating way, and then is discharged from the flue outlet 13 of the tail flue 18 after passing through the tail heating surface 17, the SCR denitration system 7 and the air preheater 11, wherein accumulated ash is discharged from the ash discharge port 14. The inside of the middle bottom surface of the furnace top reactor 8 is inclined downwards along the flow direction of the flue gas, so that the ash is discharged, and a capacity expansion structure is formed, so that the flow of the flue gas at the downstream of the furnace top reactor 8 is more uniform. When the number of the inlets of the furnace top reactors 8 is two, the two groups of rotational flows of the two flue gas entering through the inlets of the two furnace top reactors 8 are not influenced by each other through the reactor partition wall 12 in the furnace top reactors 8, so that the reaction effect is ensured, and meanwhile, the arrangement is canceled at the downstream of the flue gas of the furnace top reactors 8, so that the two flue gas are uniformly mixed, and the rotation is eliminated.
The inner wall of the furnace top reactor 8 is provided with a heat insulation layer or a heat absorption layer, and the reaction temperature in the furnace top reactor 8 can be maintained or regulated according to the reaction requirement. In addition, the desulfurization waste water is sprayed through the inlet nozzle group 6, so that the effect of adjusting the temperature of the furnace top reactor 8 is achieved while the evaporation and the removal of the desulfurization waste water are realized, and the desulfurization waste water is suitable for the working conditions of high load and high smoke temperature. In addition, the supplementary injection of the reactants can be performed through the supplementary nozzle set 9. Simultaneously, denitration reducing agent solution and desulfurization wastewater can be sprayed into the furnace top reactor 8 through the inlet nozzle group 6; the fine particulate matter agglomerating agent and the heavy metal adsorbent are sprayed into the furnace top reactor 8 through the supplementing nozzle group 9.
Example 1
Referring to fig. 1 and 2, the number of inlets of the furnace top reactors 8 is two, wherein the two inlets of the furnace top reactors 8 are respectively positioned at two sides of the top of the hearth 3 and near the side wall. The two flue gases reversely rotate in the furnace top reactor 8, and the inlet nozzle group 6 is arranged at the positions of the left wall, the right wall and the middle triangle notch of the hearth 3. The denitration reducing agent solution and the desulfurization wastewater are sprayed into a furnace top reactor 8 through an inlet nozzle group 6; the fine particulate matter agglomerating agent and the heavy metal adsorbent are sprayed into the furnace top reactor 8 through the supplementing nozzle group 9, so that the combined removal of various pollutants such as NOx, fine particulate matters, heavy metals, desulfurization wastewater and the like is effectively promoted, and meanwhile, the SCR denitration system 7 is arranged in the tail flue 18, so that the further removal of NOx is realized.
Example two
Referring to fig. 3 and 4, the number of inlets of the furnace top reactor 8 is one, and the inlets of the furnace top reactor 8 are positioned at the middle position of the top of the hearth 3, the flue gas reversely rotates in the furnace top reactor 8, a reactor partition wall 12 is not arranged in the furnace top reactor 8, and the inlet nozzle group 6 is arranged at the front wall position and the rear wall position of the hearth 3. The denitration reducing agent solution and the desulfurization wastewater are sprayed into the furnace top reactor 8 through the inlet nozzle group 6 and the supplementing nozzle group 9, so that the removal of NOx is greatly promoted, the combined removal of the desulfurization wastewater is realized, the SCR denitration system 7 is not arranged in the tail flue 18, and the method is suitable for occasions with low NOx emission requirements.
Example III
Referring to fig. 5 and 6, the number of inlets of the furnace top reactors 8 is two, wherein one inlet of the furnace top reactors 8 is positioned at the side surface of the hearth 3 and near the side wall, the other inlet of the furnace top reactors 8 is positioned at the position near the middle of the top of the hearth 3, a reactor partition wall 12 is arranged at the position of the flue gas upstream and the flue gas midstream in the furnace top reactors 8, two flue gases rotate in the furnace top reactors 8 in the same direction, an inlet nozzle group 6 is arranged at the positions of the left wall, the right wall and the triangular notch of the hearth 3, and denitration reducing agent solution and desulfurization wastewater are sprayed into the furnace top reactors 8 from the inlet nozzle group 6; fine particulate matter agglomerating agent and heavy metal adsorbent are sprayed into the furnace top reactor 8 from the supplementing nozzle group 9; thereby effectively promoting the joint removal of a plurality of pollutants such as NOx, fine particles, heavy metal, desulfurization waste water and the like, and the SCR denitration system 7 is arranged in the tail flue 18 to realize the further removal of NOx.
Finally, it should be noted that the pulverized coal boiler with the furnace top reactor 8 of the invention is not only a brand new design different from the existing tower type furnace, pi type furnace and other furnace types, but also has good inheritance with the existing furnace types, has no technical risk, and combines the advantages of the existing furnace types. For example, the hearth 3 and the front heating surface 5 are similar to a tower furnace, and have the advantages of uniform flue gas, small temperature deviation, light abrasion, no risk of oxide scale falling off and the like; the tail flue 18 is similar to a pi-type furnace, reduces the elevation of the boiler, reduces the length and resistance loss of a steam pipeline, and has the cost not higher than that of the existing tower type boiler, and special pollutant control equipment is not required to be additionally added, so that the better multi-pollutant combined removal can be realized with lower investment cost in the aspect of pollutant control.
Claims (4)
1. The pulverized coal boiler with the furnace top reactor for realizing the combined removal of multiple pollutants is characterized by comprising a hearth (3), the furnace top reactor (8) and a tail flue (18);
a front heating surface (5) is arranged in the hearth (3), a flue gas outlet at the top of the hearth (3) is communicated with an inlet of a furnace top reactor (8), an outlet of the furnace top reactor (8) is communicated with a tail flue (18), and an inlet nozzle group (6) is arranged at the inlet of the furnace top reactor (8);
a supplemental nozzle group (9) is arranged at the position of the flue gas upstream in the furnace top reactor (8);
the cross section of the inlet of the furnace top reactor (8) is gradually reduced along the flow direction of the flue gas;
the number of inlets of the furnace top reactors (8) is two, wherein the inlet of one furnace top reactor (8) is positioned at the side surface of the hearth (3) and near the side wall, the inlet of the other furnace top reactor (8) is positioned at the position near the middle of the top of the hearth (3), and the positions of the upstream and the midstream of the flue gas in the furnace top reactor (8) are provided with reactor partition walls (12);
the periphery of the hearth (3) is provided with a burner (2) and an burnout air port (4), and the bottom of the hearth (3) is provided with a slag discharge port (1);
flue partition walls (16), an SCR denitration system (7) and an air preheater (11) are sequentially arranged in the tail flue (18) along the flowing direction of the flue gas, tail heating surfaces (17) are arranged on two sides of the flue partition walls (16), an ash discharge port (14) is arranged at the bottom of the tail flue (18), and a flue outlet (13) is arranged on the side face of the bottom of the tail flue (18).
2. Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal according to claim 1, characterized in that the outlet of furnace top reactor (8) is provided with flue gas baffle (15);
the inner wall of the furnace top reactor (8) is provided with a heat insulation layer or a heat absorption layer.
3. Pulverized coal boiler with a furnace top reactor for combined removal of multiple pollutants according to claim 1, characterized in that the side wall of the furnace top reactor (8) inlet is a flame folding structure (10), by means of which flame folding structure (10) the cross section of the furnace top reactor (8) inlet is gradually reduced in the direction of the flue gas flow and the flue gas forms a swirl in the furnace top reactor (8).
4. Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal according to claim 1, characterized in that the inner wall of the bottom surface of the middle part of furnace top reactor (8) is inclined downwards in the direction of flue gas flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811420230.8A CN109404897B (en) | 2018-11-26 | 2018-11-26 | Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811420230.8A CN109404897B (en) | 2018-11-26 | 2018-11-26 | Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109404897A CN109404897A (en) | 2019-03-01 |
| CN109404897B true CN109404897B (en) | 2024-01-30 |
Family
ID=65455640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811420230.8A Active CN109404897B (en) | 2018-11-26 | 2018-11-26 | Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109404897B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553420A (en) * | 2011-12-13 | 2012-07-11 | 中能东讯新能源科技(大连)有限公司 | High-efficiency denitrifying device for pulverized coal boiler |
| CN102961956A (en) * | 2012-11-29 | 2013-03-13 | 华南理工大学 | CFD-based industrial boiler selective non-catalytic reduction (SNCR) denitration device |
| CN105276598A (en) * | 2015-10-21 | 2016-01-27 | 西安交通大学 | Method for simultaneously controlling coking and corroding of heating surface and NOx emission of biomass CFB boiler |
| CN106090969A (en) * | 2016-06-16 | 2016-11-09 | 国网天津市电力公司 | A kind of coal-burning boiler SNCR+SCR denitrification apparatus cooperation optimizes and revises method |
| CN209213839U (en) * | 2018-11-26 | 2019-08-06 | 中国华能集团清洁能源技术研究院有限公司 | A kind of pulverized-coal fired boiler for realizing multi-pollutant joint removing with furnace roof reactor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5523807B2 (en) * | 2009-08-05 | 2014-06-18 | 三菱重工業株式会社 | Exhaust gas treatment equipment |
-
2018
- 2018-11-26 CN CN201811420230.8A patent/CN109404897B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553420A (en) * | 2011-12-13 | 2012-07-11 | 中能东讯新能源科技(大连)有限公司 | High-efficiency denitrifying device for pulverized coal boiler |
| CN102961956A (en) * | 2012-11-29 | 2013-03-13 | 华南理工大学 | CFD-based industrial boiler selective non-catalytic reduction (SNCR) denitration device |
| CN105276598A (en) * | 2015-10-21 | 2016-01-27 | 西安交通大学 | Method for simultaneously controlling coking and corroding of heating surface and NOx emission of biomass CFB boiler |
| CN106090969A (en) * | 2016-06-16 | 2016-11-09 | 国网天津市电力公司 | A kind of coal-burning boiler SNCR+SCR denitrification apparatus cooperation optimizes and revises method |
| CN209213839U (en) * | 2018-11-26 | 2019-08-06 | 中国华能集团清洁能源技术研究院有限公司 | A kind of pulverized-coal fired boiler for realizing multi-pollutant joint removing with furnace roof reactor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109404897A (en) | 2019-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204574069U (en) | Coal fired power plant minimum discharge environmental protection island system | |
| JP7207810B2 (en) | Method and system for improving boiler efficiency | |
| CN111450681B (en) | Denitration, desulfurization and dust removal integrated system for supercritical carbon dioxide coal-fired boiler | |
| CN204555717U (en) | Warm flue gas SCR denitration device in a kind of cement kiln end | |
| CN104100964A (en) | Synergistic removal system and method for realizing ultra-low emission of multiple pollutants of smoke of thermal power plant | |
| CN204005957U (en) | A kind of cooperation-removal system that realizes the minimum discharge of coal steam-electric plant smoke multi-pollutant | |
| CN103604116A (en) | Device and method for reducing oxynitrides smoke product of circulating fluidized bed boiler | |
| CN103994456A (en) | Integrated system for efficiently and synergistically removing multiple pollutants | |
| CN203595119U (en) | Device capable of reducing nitric oxides in flue gas product of circulating fluidized bed boiler | |
| CN205127750U (en) | Desulphurization of exhaust gas denitration of coke oven flue and waste heat recovery's integrated system | |
| CN109404897B (en) | Pulverized coal boiler with furnace top reactor for realizing multi-pollutant combined removal | |
| Zhang et al. | Effect of low-nitrogen combustion system with flue gas circulation technology on the performance of NOx emission in waste-to-energy power plant | |
| CN204582573U (en) | A kind of coal-fired flue-gas pollutant minimum discharge system with swinging GGH | |
| CN209213839U (en) | A kind of pulverized-coal fired boiler for realizing multi-pollutant joint removing with furnace roof reactor | |
| CN207991293U (en) | A kind of UTILIZATION OF VESIDUAL HEAT IN and flue gas purification system of electrolysis flue gas | |
| CN203836997U (en) | Various-contaminant high-efficiency cooperative removing integrated system | |
| CN209279188U (en) | The pulverized-coal fired boiler of multi-pollutant joint removing is realized for ultrahigh steam temperature steam parameter | |
| CN206386910U (en) | A kind of system of W types boiler low nitrogen burning coordinated desulfurization waste water evaporation | |
| CN111450682B (en) | Deep denitration process for supercritical carbon dioxide coal-fired boiler | |
| Wang et al. | Cases of ultra-low emission coal-fired power plants | |
| CN109404952B (en) | Pulverized coal boiler for realizing multi-pollutant combined removal by ultrahigh steam temperature steam parameters | |
| CN210057875U (en) | Rotary-vane SNCR denitration mixing system for pulverized coal furnace | |
| CN211435702U (en) | Multi-pollutant integrated removing system of circulating fluidized bed boiler | |
| CN111895799A (en) | Heating furnace waste gas multi-pollutant cooperative treatment system | |
| CN210356701U (en) | Novel power plant boiler SCR deNOx systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |