CN109404952B - Pulverized coal boiler for realizing multi-pollutant combined removal by ultrahigh steam temperature steam parameters - Google Patents
Pulverized coal boiler for realizing multi-pollutant combined removal by ultrahigh steam temperature steam parameters Download PDFInfo
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- CN109404952B CN109404952B CN201811420275.5A CN201811420275A CN109404952B CN 109404952 B CN109404952 B CN 109404952B CN 201811420275 A CN201811420275 A CN 201811420275A CN 109404952 B CN109404952 B CN 109404952B
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- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 29
- 239000003245 coal Substances 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 16
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 14
- 230000023556 desulfurization Effects 0.000 claims abstract description 14
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- 239000002351 wastewater Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 47
- 239000003546 flue gas Substances 0.000 claims description 40
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 38
- 238000005192 partition Methods 0.000 claims description 20
- 231100000719 pollutant Toxicity 0.000 claims description 16
- 239000003463 adsorbent Substances 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000013618 particulate matter Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 abstract description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 7
- 239000000428 dust Substances 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
- 239000000779 smoke Substances 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 238000000034 method 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
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000356 contaminant Substances 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
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation 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
- 238000002156 mixing Methods 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
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- 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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- 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
- F23J13/00—Fittings for chimneys or flues
-
- 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
Abstract
The invention discloses a pulverized coal boiler for realizing multi-pollutant combined removal by using ultra-high steam temperature steam parameters, which comprises a hearth, a horizontal shrinkage flue, a hearth outlet downstream flue, a hearth outlet upstream flue and a tail downstream flue; the horizontal shrinkage flue is provided with a nozzle group, a screen heating surface is arranged above the furnace, and the pulverized coal boiler can control NOx, micron-sized fine particles, heavy metals and desulfurization wastewater of a coal-fired power plant.
Description
Technical Field
The invention belongs to the fields of thermal generator sets and environmental protection, and relates to a pulverized coal boiler for realizing multi-pollutant combined removal by using ultra-high steam temperature steam parameters.
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.
The flue gas generated by burning coal contains a great amount of smoke dust and sulfur dioxide (SO) 2 ) Nitrogen Oxides (NO) X ) Contaminants such as heavy metals, are the above contaminantsA primary source of emissions. 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 recent years, with reference to the emission limit of the 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 is 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.
The pollution control of the pulverized coal boiler still depends on the traditional desulfurization, denitrification and dust removal devices, and the problems are presented. Therefore, on the basis, the control of pollutants such as NOx, micron-sized fine particles, heavy metals, desulfurization wastewater and the like is enhanced, and the combined removal of various pollutants is realized through one set of equipment, so that the method has very important significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the pulverized coal boiler for realizing multi-pollutant combined removal by using ultra-high steam temperature steam parameters, which can realize the control of NOx, micron-sized fine particles, heavy metals and desulfurization wastewater of a coal-fired power plant.
In order to achieve the aim, the pulverized coal boiler for realizing multi-pollutant combined removal by using ultra-high steam temperature steam parameters comprises a hearth, a horizontal shrinkage flue, a hearth outlet downstream flue, a hearth outlet upstream flue and a tail downstream flue;
the hearth, the horizontal necking flue, the hearth outlet downlink flue, the hearth outlet uplink flue and the tail downlink flue are sequentially communicated, a nozzle group is arranged on the horizontal necking flue, and a screen type heating surface is arranged above the hearth.
The cross section of the horizontal necking flue outlet gradually reduces along the flowing direction of the flue gas.
The upper side of the hearth outlet descending flue is internally provided with a reaction zone partition wall, wherein the upper side of the hearth outlet descending flue is divided into two reaction zones through the reaction zone partition wall, the horizontal necking flue is provided with two outlets, one horizontal necking flue outlet corresponds to one reaction zone, the two outlets of the horizontal necking flue are respectively communicated with the corresponding reaction zones, and the two outlets of the horizontal necking flue are respectively positioned at the two sides of the top of the hearth and are close to the positions of the side walls.
The upper side of the furnace outlet descending flue is internally provided with a reaction zone partition wall, wherein the upper side of the furnace outlet descending flue is divided into two reaction zones through the reaction zone partition wall, the horizontal shrinkage flue is provided with two outlets, one horizontal shrinkage flue outlet corresponds to one reaction zone, the two outlets of the horizontal shrinkage flue are respectively communicated with the corresponding reaction zones, the two outlets of the horizontal shrinkage flue are both positioned at the top of the furnace, the outlet of one horizontal shrinkage flue is close to the side wall, and the outlet of the other horizontal shrinkage flue is close to the middle position of the horizontal shrinkage flue.
The upper side of the hearth outlet descending flue is divided into two reaction areas by the reaction area partition wall, the cross section of the horizontal necking flue is of a trapezoid structure, and the horizontal necking flue is connected with the two reaction areas.
The peripheral wall surfaces of the hearth outlet downlink flue are flue partition walls and reaction zone covering walls, wherein an insulating layer or a heated surface layer is arranged on the inner wall of the hearth outlet downlink flue.
The bottom of the hearth is provided with a slag hole, the inner wall of the hearth is provided with a water cooling wall, and the hearth outlet downstream flue and the hearth outlet upstream flue are separated by a flue separating wall.
The device also comprises an ultrahigh temperature steam pipeline and a steam turbine, wherein a final-stage superheater and a final-stage reheater are arranged in an upstream flue of the hearth outlet, and the final-stage superheater are connected with the steam turbine through the ultrahigh temperature steam pipeline.
An uplink flue separating wall, a flue gas baffle, a first low-temperature heating surface group and a second low-temperature heating surface group are arranged in an uplink flue of the hearth outlet, the final superheater and the final reheater are respectively positioned at two sides of the uplink flue separating wall, the low-temperature heating surfaces in the second low-temperature heating surface group are respectively positioned at two sides of the uplink flue separating wall, and the uplink flue separating wall, the flue gas baffle and the first low-temperature heating surface group are sequentially distributed along the flow direction of flue gas.
The denitration system, the tail descending flue and the air preheater are sequentially arranged in the tail descending flue along the flowing direction of the flue gas, a flue gas outlet is formed in the side face of the bottom of the tail descending flue, and ash discharge ports are formed in the bottom of the tail descending flue and the bottom of the hearth outlet ascending flue.
The invention has the following beneficial effects:
when the pulverized coal boiler for realizing multi-pollutant combined removal by using the ultra-high steam temperature steam parameters is specifically operated, high-temperature flue gas enters a hearth outlet downlink flue through a horizontal necking flue, meanwhile, denitration reducing agent solution, fine particulate matter agglomeration agent, heavy metal adsorbent and desulfurization wastewater are sprayed into the hearth outlet downlink flue through a nozzle group in the horizontal necking flue, and the mixed reaction is carried out with the flue gas in the hearth outlet downlink flue, so that the combined removal of various pollutants is realized. In addition, the cross section of the horizontal necking flue outlet gradually reduces along the flowing direction of the flue gas, so that the flue gas forms vortex in the descending flue of the hearth outlet, thereby promoting the full mixing of the flue gas and reactants, simultaneously increasing the residence time of the flue gas in the descending flue of the hearth outlet, ensuring the full reaction, and realizing the control of NOx, micron-sized fine particles, heavy metals and desulfurization wastewater of the coal-fired power plant.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view of an embodiment-A-A of FIG. 1;
FIG. 3 is a cross-sectional view of the second embodiment at A-A in FIG. 1;
FIG. 4 is a cross-sectional view of embodiment III at A-A in FIG. 1;
the device comprises a slag hole 1, a hearth 2, a water cooling wall 3, a screen heating surface 4, a horizontal shrinkage flue 5, a flue partition wall 6, a reaction zone covering wall 7, a nozzle group 8, a hearth outlet downstream flue 9, a reaction zone partition wall 10, a final stage superheater 11, a hearth outlet upstream flue 12, a flue gas baffle 13, a second low-temperature heating surface group 14, a final stage reheater 15, an upstream flue partition wall 16, an ash discharge port 17, an ultrahigh-temperature steam pipeline 18, a denitration system 19, a tail downstream flue 20, an air preheater 21, a flue gas outlet 22 and a steam turbine 23.
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 for realizing multi-pollutant combined removal by ultra-high steam temperature steam parameters comprises a hearth 2, a horizontal necking flue 5, a hearth outlet downlink flue 9, a hearth outlet uplink flue 12 and a tail downlink flue 20; the hearth 2, the horizontal reducing flue 5, the hearth outlet downstream flue 9, the hearth outlet upstream flue 12 and the tail downstream flue 20 are sequentially communicated, the horizontal reducing flue 5 is provided with a nozzle group 8, a screen heating surface 4 is arranged above the hearth 2, and the cross section of the outlet of the horizontal reducing flue 5 is gradually reduced along the flow direction of the flue gas.
The peripheral wall surfaces of the hearth outlet downlink flue 9 are flue partition walls 6 and reaction zone covering walls 7, wherein an insulating layer or a heated surface layer is arranged on the inner wall of the hearth outlet downlink flue 9; the bottom of the hearth 2 is provided with a slag hole 1, the inner wall of the hearth 2 is provided with a water cooling wall 3, and a hearth outlet downstream flue 9 is separated from a hearth outlet upstream flue 12 by a flue separation wall 6.
The invention further comprises an ultra-high temperature steam pipeline 18 and a steam turbine 23, a final superheater 11 and a final reheater 15 are arranged in the hearth outlet uplink flue 12, wherein the final superheater 11 and the final superheater 11 are connected with the steam turbine 23 through the ultra-high temperature steam pipeline 18, an uplink flue separating wall 16, a flue gas baffle 13, a first low-temperature heating surface group and a second low-temperature heating surface group 14 are arranged in the hearth outlet uplink flue 12, the final superheater 11 and the final reheater 15 are respectively positioned at two sides of the uplink flue separating wall 16, each low-temperature heating surface in the second low-temperature heating surface group is respectively positioned at two sides of the uplink flue separating wall 16, and the uplink flue separating wall 16, the flue gas baffle 13 and the first low-temperature heating surface group are sequentially distributed along the direction of flue gas flow.
The denitration system 19, the tail descending flue 20 and the air preheater 21 are sequentially arranged in the tail descending flue 20 along the flow direction of the flue gas, a flue gas outlet 22 is arranged on the side face of the bottom of the tail descending flue 20, and ash discharge ports 17 are formed in the bottom of the tail descending flue 20 and the bottom of the hearth outlet ascending flue 12.
When the flue gas desulfurization device works, high-temperature flue gas enters the horizontal shrinkage flue 5 after heat exchange of the screen heating surface 4, and the cross section of the outlet of the horizontal shrinkage flue 5 gradually reduces along the flowing direction of the flue gas, so that the flue gas forms vortex in the downstream flue 9 at the outlet of the furnace, meanwhile, denitration reducing agent solution, fine particulate matter agglomerating agent, heavy metal adsorbent and desulfurization wastewater are sprayed into the downstream flue 9 at the outlet of the furnace through the nozzle group 8 and then are mixed with the flue gas in the downstream flue 9 at the outlet of the furnace to realize the combined removal of various pollutants. Meanwhile, the lower part of the hearth outlet descending flue 9 cancels the reaction zone partition wall 10, so that two flue gases are uniformly mixed, and rotation is eliminated.
Example 1
Referring to fig. 2, a reaction zone partition wall 10 is disposed in the upper side of the furnace outlet downlink flue 9, wherein the upper side of the furnace outlet downlink flue 9 is divided into two reaction zones by the reaction zone partition wall 10, the horizontal shrinkage flue 5 is provided with two outlets, one of the outlets of the horizontal shrinkage flue 5 corresponds to one reaction zone, the two outlets of the horizontal shrinkage flue 5 are respectively communicated with the corresponding reaction zones, and the two outlets of the horizontal shrinkage flue 5 are respectively located at two sides of the top of the furnace 2 and near the side wall. The two flue gases respectively reversely rotate in the two reaction areas, the nozzle group 8 is arranged at the left wall and the right wall of the horizontal necking flue 5, and the denitration reducing agent solution, the fine particulate matter agglomerating agent, the heavy metal adsorbent and the desulfurization wastewater are respectively sprayed into the hearth outlet downlink flue 9 for reaction, so that the combined removal of various pollutants is realized.
Example two
Referring to fig. 3, a reaction zone partition wall 10 is arranged in the upper side of the furnace outlet downlink flue 9, wherein the upper side of the furnace outlet downlink flue 9 is divided into two reaction zones by the reaction zone partition wall 10, the cross section of the horizontal necking flue 5 is of a trapezoid structure, the horizontal necking flue 5 is connected with the two reaction zones, two flue gases respectively reversely rotate in the two reaction zones, a nozzle group 8 is arranged at the upper wall position and the lower wall position of the horizontal necking flue 5, and a denitration reducing agent solution, a fine particulate matter agglomeration agent, a heavy metal adsorbent and desulfurization wastewater are respectively sprayed into the furnace outlet downlink flue 9 for reaction, so that the combined removal of various pollutants is realized.
Example III
Referring to fig. 4, a reaction zone partition wall 10 is disposed in the upper side of the furnace outlet downlink flue 9, wherein the upper side of the furnace outlet downlink flue 9 is divided into two reaction zones by the reaction zone partition wall 10, the horizontal shrinkage flue 5 is provided with two outlets, one of the outlets of the horizontal shrinkage flue 5 corresponds to one reaction zone, the two outlets of the horizontal shrinkage flue 5 are respectively communicated with the corresponding reaction zone, the two outlets of the horizontal shrinkage flue 5 are all located at the top of the furnace 2, one of the outlets of the horizontal shrinkage flue 5 is close to a side wall, the other outlet of the horizontal shrinkage flue 5 is close to the middle position of the horizontal shrinkage flue 5, two flue gases rotate in the same direction in the two reaction zones, the nozzle group 8 is disposed at the left wall and the right wall of the horizontal shrinkage flue 5, and denitration reducing agent solution, fine particulate matter agglomeration agent, heavy metal adsorbent and desulfurization wastewater are respectively sprayed into the furnace outlet downlink flue 9 for reaction, so that joint removal of various pollutants is realized.
Claims (5)
1. The pulverized coal boiler for realizing multi-pollutant combined removal by using ultra-high steam temperature steam parameters is characterized by comprising a hearth (2), a horizontal necking flue (5), a hearth outlet downstream flue (9), a hearth outlet upstream flue (12) and a tail downstream flue (20);
the hearth (2), the horizontal necking flue (5), the hearth outlet downlink flue (9), the hearth outlet uplink flue (12) and the tail downlink flue (20) are sequentially communicated, a nozzle group (8) is arranged on the horizontal necking flue (5), and a screen heating surface (4) is arranged above the hearth (2);
the high-temperature flue gas enters the hearth outlet downlink flue through the horizontal reducing flue, and meanwhile, the denitration reducing agent solution, the fine particulate matter agglomerating agent, the heavy metal adsorbent and the desulfurization wastewater are sprayed into the hearth outlet downlink flue through a nozzle group in the horizontal reducing flue and are subjected to mixed reaction with the flue gas in the hearth outlet downlink flue, so that the combined removal of various pollutants is realized;
the cross section of the outlet of the horizontal necking flue (5) is gradually reduced along the flowing direction of the flue gas;
a reaction zone partition wall (10) is arranged in the upper side of the hearth outlet downlink flue (9), wherein the upper side of the hearth outlet downlink flue (9) is divided into two reaction zones by the reaction zone partition wall (10), the cross section of the horizontal necking flue (5) is of a trapezoid structure, and the horizontal necking flue (5) is connected with the two reaction zones;
the peripheral wall surfaces of the hearth outlet descending flue (9) are flue partition walls (6) and reaction zone covering walls (7), wherein an insulating layer or a heated surface layer is arranged on the inner wall of the hearth outlet descending flue (9).
2. Pulverized coal boiler for realizing multi-pollutant combined removal by ultra-high steam temperature steam parameters according to claim 1, characterized in that the bottom of the furnace (2) is provided with a slag hole (1), the inner wall of the furnace (2) is provided with a water cooling wall (3), and a furnace outlet downstream flue (9) is separated from a furnace outlet upstream flue (12) by a flue separation wall (6).
3. Pulverized coal boiler for realizing multi-pollutant combined removal by ultra-high steam temperature steam parameters according to claim 1, further comprising an ultra-high temperature steam pipeline (18) and a steam turbine (23), wherein a final superheater (11) and a final reheater (15) are arranged in a furnace outlet upstream flue (12), and the final superheater (11) are connected with the steam turbine (23) through the ultra-high temperature steam pipeline (18).
4. The pulverized coal boiler for realizing multi-pollutant combined removal by ultra-high steam temperature steam parameters according to claim 3, wherein an uplink flue separation wall (16), a flue gas baffle (13), a first low-temperature heating surface group and a second low-temperature heating surface group (14) are arranged in an uplink flue (12) of a hearth outlet, the final superheater (11) and the final reheater (15) are respectively positioned at two sides of the uplink flue separation wall (16), each low-temperature heating surface in the second low-temperature heating surface group is respectively positioned at two sides of the uplink flue separation wall (16), and the uplink flue separation wall (16), the flue gas baffle (13) and the first low-temperature heating surface group are sequentially distributed along the direction of flue gas flow.
5. The pulverized coal boiler for realizing multi-pollutant combined removal by ultra-high steam temperature steam parameters according to claim 1, wherein a denitration system (19), a tail descending flue (20) and an air preheater (21) are sequentially arranged in a tail descending flue (20) along the flow direction of flue gas, a flue gas outlet (22) is arranged on the side surface of the bottom of the tail descending flue (20), and ash outlets (17) are formed in the bottom of the tail descending flue (20) and the bottom of a hearth outlet ascending flue (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811420275.5A CN109404952B (en) | 2018-11-26 | 2018-11-26 | Pulverized coal boiler for realizing multi-pollutant combined removal by ultrahigh steam temperature steam parameters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811420275.5A CN109404952B (en) | 2018-11-26 | 2018-11-26 | Pulverized coal boiler for realizing multi-pollutant combined removal by ultrahigh steam temperature steam parameters |
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| Publication Number | Publication Date |
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| CN109404952A CN109404952A (en) | 2019-03-01 |
| CN109404952B true CN109404952B (en) | 2024-03-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2735560A1 (en) * | 1995-06-16 | 1996-12-20 | Gec Alsthom Stein Ind | Method of reducing pollution from fluidised bed combustion heater furnace |
| CN102128443A (en) * | 2011-03-08 | 2011-07-20 | 中国华能集团清洁能源技术研究院有限公司 | Pulverized coal boiler suitable for ultrahigh steam temperature |
| 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 |
| CN205127750U (en) * | 2015-09-29 | 2016-04-06 | 成都华西堂投资有限公司 | Desulphurization of exhaust gas denitration of coke oven flue and waste heat recovery's integrated system |
| CN209279188U (en) * | 2018-11-26 | 2019-08-20 | 中国华能集团清洁能源技术研究院有限公司 | The pulverized-coal fired boiler of multi-pollutant joint removing is realized for ultrahigh steam temperature steam parameter |
-
2018
- 2018-11-26 CN CN201811420275.5A patent/CN109404952B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2735560A1 (en) * | 1995-06-16 | 1996-12-20 | Gec Alsthom Stein Ind | Method of reducing pollution from fluidised bed combustion heater furnace |
| CN102128443A (en) * | 2011-03-08 | 2011-07-20 | 中国华能集团清洁能源技术研究院有限公司 | Pulverized coal boiler suitable for ultrahigh steam temperature |
| 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 |
| CN205127750U (en) * | 2015-09-29 | 2016-04-06 | 成都华西堂投资有限公司 | Desulphurization of exhaust gas denitration of coke oven flue and waste heat recovery's integrated system |
| CN209279188U (en) * | 2018-11-26 | 2019-08-20 | 中国华能集团清洁能源技术研究院有限公司 | The pulverized-coal fired boiler of multi-pollutant joint removing is realized for ultrahigh steam temperature steam parameter |
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