CN111076206A - System and method for meeting operating temperature requirement of full-load denitration catalyst of coal-fired thermal power generating unit - Google Patents
System and method for meeting operating temperature requirement of full-load denitration catalyst of coal-fired thermal power generating unit Download PDFInfo
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- CN111076206A CN111076206A CN201911137295.6A CN201911137295A CN111076206A CN 111076206 A CN111076206 A CN 111076206A CN 201911137295 A CN201911137295 A CN 201911137295A CN 111076206 A CN111076206 A CN 111076206A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 179
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000003546 flue gas Substances 0.000 claims abstract description 65
- 239000000446 fuel Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000004200 deflagration Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000011017 operating method Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 239000000779 smoke Substances 0.000 description 3
- 238000002679 ablation Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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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
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- 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
- B01D53/346—Controlling the process
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- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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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
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/10—Catalytic reduction devices
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a system and a method for meeting the operating temperature requirement of a full-load (including startup and shutdown) denitration catalyst of a coal-fired thermal power unit, belongs to the technical field of flue gas denitration of coal-fired thermal power plants, and aims to solve the following problems: the coal-fired thermal power unit is starting, the full load section of shutting down the fortune and the low-load operation, and deNOx Systems (SCR) entry flue gas temperature is less than the denitration and puts into operation temperature, does not satisfy the problem of denitration and put into operation condition. The process system comprises a bypass combustion system and a combustion system, adopts a combustor and a matched system thereof, and enables the flue gas temperature at the denitration inlet of the full-load section of the unit to be higher than the denitration commissioning temperature requirement in a mode of combining external heating, remixing and afterburning in a flue, so that the denitration can be put into operation in each stage of starting, low-load operation and shutdown of the unit, and the requirement of environmental protection (NOx) emission of the full-load section of the unit is met.
Description
Technical Field
The invention relates to a system and a method for meeting the operating temperature requirement of a full-load (including startup and shutdown) denitration catalyst of a coal-fired thermal power unit, and belongs to the technical field of flue gas denitration of coal-fired thermal power plants.
Background
In order to meet the requirement of NOx emission concentration of the thermal power generating unit, the thermal power generating unit is provided with an SCR denitration device. The normal working temperature range of the catalyst of the denitration device is 300-420 ℃, and the catalyst cannot play the due role when the temperature exceeds the temperature range. When the unit participates in deep peak regulation (low-load operation), the inlet smoke temperature of the denitration system of the unit is usually lower than 300 ℃, so that the requirement of normal operation of the denitration system cannot be met, and the environmental protection index cannot reach the standard.
In 2016, 11 months, an environmental monitoring office of the environmental protection department issues an emergency notice, the emission requirements of the boiler pollutants are improved, the average value of the data (converted) concentration of the pollutant emission hours in low-load operation of the boiler is required not to exceed the standard, and the emission of the boiler reaches the standard in starting, stopping and operation of each load. And during the starting and stopping processes of the coal-fired unit, the flue gas temperature at the SCR inlet is lower during the operation with lower load, and the denitration operation requirement can not be met. The wide-load denitration technology applied to the current market can only solve the problem of low-load denitration operation of a unit due to limited temperature rise range, and cannot meet the requirement of startup and shutdown denitration operation. Based on the reasons, the development of the technology for meeting the startup and shutdown of the unit and the operation of SCR denitration in each low-load time period is urgent.
Disclosure of Invention
The invention aims to solve the problem that the inlet flue gas temperature of a denitration System (SCR) is lower than denitration operation temperature and cannot be put into operation in the whole process of starting, stopping and low-load operation of a coal-fired power plant unit, and further provides a system and a method for meeting the operation temperature requirement of a full-load (including starting and stopping) denitration catalyst of a coal-fired thermal power unit.
The technical scheme adopted by the invention for solving the problems is as follows: a system meeting the operating temperature requirement of a full-load denitration catalyst of a coal-fired thermal power generating unit comprises an original flue and a downstream flue, wherein the original flue is communicated with the downstream flue, and the downstream flue is communicated to a denitration system; the device is characterized by further comprising a bypass combustion system and a combustion system, wherein the bypass combustion system comprises a flue bypass combustor and a flue bypass combustion chamber, the flue bypass combustor is communicated with the flue bypass combustion chamber, the original flue is communicated with a flue gas inlet of the flue bypass combustion chamber through a bypass pipeline, a bypass gate valve and a bypass booster fan are connected to the bypass pipeline, a flue gas outlet of the flue bypass combustion chamber is communicated with a mixing main pipe, and the mixing main pipe is communicated with the original flue through a mixing flue branch pipe; the combustion system comprises a combustor and a combustion chamber, the combustor is communicated with the combustion chamber, the combustion chamber is fixed with the wall surface of an original flue through a fixed rib plate, the combustion chamber is connected with a cold air pipeline, and a cold air flow adjusting baffle is connected to the cold air pipeline.
Furthermore, the combustor is fixed on a plugging plate at the tail part of the combustion chamber through a fixing device at the head part of the combustor by bolts.
Furthermore, the combustion chamber comprises a combustion chamber outer sleeve and an inner combustion chamber, the combustion chamber outer sleeve is arranged outside the inner combustion chamber, the length of the combustion chamber outer sleeve is greater than that of the inner combustion chamber, the head part of the combustion chamber is provided with a flow equalizing plate, the flow equalizing plate is made of high-temperature-resistant materials, and a plurality of flow equalizing holes are formed in the flow equalizing plate, so that the effects of flue gas flow equalization and pressure stabilization in the combustion chamber are achieved, and the normal combustion of fuel is ensured; the inner wall of the combustion chamber outer sleeve is provided with a high-temperature-resistant pouring layer which plays a role in protecting the combustion chamber outer sleeve from being directly washed away by flame roots to cause ablation.
Furthermore, the inner combustion chamber is made of high-temperature-resistant materials, and the wall surface of the inner combustion chamber is provided with a plurality of cooling holes; the welding of interior combustion chamber is on the shutoff board, and the outer wall of interior combustion chamber has the several fixed plate along the axial welding, contained angle between the fixed plate is 120, the clearance that the interior combustion chamber passes through the fixed plate assurance and combustion chamber overcoat with fixed.
Further, the head part of the burner comprises an outer air sleeve and an inner fuel channel, the outer air sleeve is arranged outside the inner fuel channel, and an air circulation channel for the operation of the burner is formed between the outer air sleeve and the inner fuel channel and is used for providing oxygen required by the combustion of the fuel; a rotational flow device is arranged in the air circulation channel, so that air has tangential momentum, the mixing of fuel and air is increased, the combustion is enhanced, and the combustion efficiency is improved; the excess air coefficient of the combustion of the fuel of the combustion engine is 1.15-1.3, and high-temperature flue gas generated by combustion of the fuel is mixed with cold flue gas in an original flue and then enters a downstream flue.
Furthermore, the tail part of the combustion chamber jacket is communicated with a cold air pipeline, the cold air flow adjusting baffle plate on the cold air pipeline realizes the adjustment of the flow of cold air, one part of the gap between the cold air entering the combustion chamber jacket and the inner combustion chamber flows downstream along the gap, and the other part of the cold air enters the inner combustion chamber through the cooling hole, so that the effect of cooling the inner combustion chamber to prevent the inner combustion chamber from being ablated by high-temperature flame is achieved.
Further, the flue bypass combustion chamber comprises a flue bypass combustion chamber outer sleeve and a flue bypass inner combustion chamber, the flue bypass combustion chamber outer sleeve is arranged outside the flue bypass inner combustion chamber, and a plurality of flue bypass cooling holes are formed in the wall surface of the flue bypass inner combustion chamber.
Furthermore, the flue gas inlet of the flue bypass combustion chamber jacket is connected with a corresponding bypass pipeline, and each bypass pipeline is provided with a set of bypass gate valve and a bypass booster fan.
Furthermore, a plurality of outlets of the flue bypass burners are communicated with a mixing main pipe, a plurality of mixed flue branch pipes are connected to the mixing main pipe, the mixed flue branch pipes are communicated with an original flue at an outlet of an original unit coal economizer, and mixed flue gas enters a downstream flue.
Furthermore, the bypass combustion system is provided with a plurality of groups and is symmetrically arranged on two sides of the original flue; the combustion system is provided with a plurality of groups of combustion systems transversely arranged on the wall surface of the original flue so as to meet the requirements of flue gas temperature improvement and temperature field uniformity.
Furthermore, the number of the flue bypass combustion engines is determined by the flue gas parameters of the original unit, and the number of the flue bypass combustion chambers, the bypass pipelines, bypass gate valves thereon and bypass booster fans is matched with the number of the flue bypass combustion engines; the mixing main pipe is provided with a plurality of mixing flue branch pipes, and the number of the mixing flue branch pipes is determined by the uniformity of an SCR inlet temperature field after high-temperature flue gas and flue gas of an original flue are mixed.
The working method of the system for meeting the running temperature requirement of the full-load denitration catalyst of the coal-fired thermal power generating unit is characterized in that in the starting stage of the unit, in order to avoid secondary deflagration of carbon which is not completely burned in a main flue of a boiler, a bypass combustion system is started, a flue bypass combustor burns fuel to generate high-temperature flue gas, the high-temperature flue gas and cold flue gas in an original flue are mixed and enter a downstream flue, the temperature of the mixed flue gas is higher than the lower limit of denitration operation temperature to meet the requirement of denitration operation temperature, denitration operation is carried out, the temperature of the flue in the original flue is gradually increased along with the starting of the unit, the operation power and the number of the flue bypass combustors in the bypass combustion system are correspondingly reduced, and the bypass combustion system is completely withdrawn until the temperature of the flue at the SCR inlet of the operation of; in a low-load operation stage (generally 20-30% of rated load) of the unit, starting a combustion system arranged on an original flue, wherein the bypass combustion system is not started, a combustor burns fuel to generate high-temperature flue gas, the high-temperature flue gas and cold flue gas in the original flue are mixed and then enter a downstream flue, and the temperature of the mixed flue gas is higher than the lower limit of denitration operation temperature, so that the denitration operation temperature requirement is met; and the operation mode of the bypass combustion system is opposite to that of the start-up stage.
Compared with the prior art, the invention has the following advantages and effects: the invention adopts the burner and the matching system thereof, and mixes the high-temperature flue gas generated by the flue after-burning and the bypass burning fuel (gas or liquid, etc.) with the cold flue gas in the original flue, so that the temperature of the mixed flue gas is higher than the lower limit of the denitration commissioning temperature, thus the denitration can be put into operation in each stage of the start-up, low-load operation and shutdown of the unit, and the requirement of the unit on all-time environmental protection (NOx) emission is met.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the system according to the embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a flue mounted combustion system in accordance with an embodiment of the present invention;
FIG. 3 is a view of the plane A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;
FIG. 5 is a schematic structural diagram of a bypass combustion system in an embodiment of the present invention;
FIG. 6 is a comparison graph of the SCR inlet smoke temperature variation curve when the system is used for heating in the boiler starting stage and the SCR inlet smoke temperature variation curve when the original oil is put into the boiler starting stage in the embodiment of the invention.
In the figure: the device comprises an original flue 1, a downstream flue 2, a flue bypass combustor 3, a flue bypass combustion chamber 4, a bypass gate valve 5, a bypass pipeline 6, a bypass booster fan 7, a mixing main pipe 8, a mixing flue branch pipe 9, a combustor 10, a combustion chamber 11, a cold air pipeline 12, a cold air flow adjusting baffle 13, a wall surface 14, a fixing rib plate 15, a high-temperature-resistant pouring layer 16, a flow equalizing plate 17, an inner combustion chamber 18, an outer air sleeve 19, an inner fuel channel 20, a bolt 21, a blocking plate 22, a fixing device 23, a combustion chamber jacket 24, a swirling device 25, a fixing plate 26, a cooling hole 27, a flue bypass combustion chamber jacket 28, a flue bypass combustion chamber 29 and a flue bypass cooling hole 30.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1 to 6, the system for meeting the operating temperature requirement of the full-load denitration catalyst of the coal-fired thermal power generating unit in the embodiment includes an original flue 1 and a downstream flue 2, the original flue 1 is communicated with the downstream flue 2, and the downstream flue 2 is communicated with a denitration system; the flue gas bypass combustion system comprises a flue bypass combustor 3 and a flue bypass combustion chamber 4, the flue bypass combustor 3 is communicated with the flue bypass combustion chamber 4, an original flue 1 is communicated with a flue gas inlet of the flue bypass combustion chamber 4 through a bypass pipeline 6, the bypass pipeline 6 is connected with a bypass gate valve 5 and a bypass booster fan 7, a flue gas outlet of the flue bypass combustion chamber 4 is communicated with a mixing main pipe 8, and the mixing main pipe 8 is communicated with the original flue 1 through a mixing flue branch pipe 9; the combustion system comprises a combustor 10 and a combustion chamber 11, the combustor 10 is communicated with the combustion chamber 11, the combustion chamber 11 is fixed with a wall surface 14 of an original flue 1 through a fixed rib plate 15, the combustion chamber 11 is connected with a cold air pipeline 12, and the cold air pipeline 12 is connected with a cold air flow adjusting baffle 13.
The burner 10 is fixed by bolts 21 to a closing plate 22 at the rear of the combustion chamber 11 by means of fixing means 23 at its head.
The combustion chamber 11 comprises a combustion chamber outer sleeve 24 and an inner combustion chamber 18, the combustion chamber outer sleeve 24 is arranged outside the inner combustion chamber 18, the length of the combustion chamber outer sleeve 24 is larger than that of the inner combustion chamber 18, the head part of the combustion chamber 11 is provided with a flow equalizing plate 17, the flow equalizing plate 17 is made of high-temperature-resistant materials, and a plurality of flow equalizing holes are formed in the flow equalizing plate 17, so that the effects of flue gas flow equalization and pressure stabilization in the combustion chamber 11 are achieved, and the normal combustion of fuel is ensured; the inner wall of the combustion chamber outer sleeve 24 is provided with a high-temperature-resistant pouring layer 16, and the high-temperature-resistant pouring layer 16 plays a role in protecting the combustion chamber outer sleeve 24 from being directly washed by flame roots to cause ablation.
The inner combustion chamber 18 is made of high-temperature resistant material, and the wall surface of the inner combustion chamber is provided with a plurality of cooling holes 27; the welding of interior combustion chamber 18 is on shutoff board 22, and the outer wall of interior combustion chamber 18 has several fixed plate 26 along the axial welding, and the contained angle between the fixed plate 26 is 120, and interior combustion chamber 18 passes through fixed plate 26 to guarantee with the clearance of combustion chamber overcoat 24 with fixed.
The head of the burner 10 comprises an outer air sleeve 19 and an inner fuel channel 20, the outer air sleeve 19 is arranged outside the inner fuel channel 20, and an air circulation channel for the operation of the burner 10 is formed between the outer air sleeve 19 and the inner fuel channel 20 and is used for providing oxygen required by the combustion of fuel; a rotational flow device 25 is also arranged in the air circulation channel, so that the air has tangential momentum, the mixing of fuel and air is increased, the combustion is enhanced, and the combustion efficiency is improved; the excess air coefficient of the combustion of the fuel of the combustor 10 is 1.15-1.3, and high-temperature flue gas generated by the combustion of the fuel is mixed with cold flue gas in the original flue 1 and then enters the downstream flue 2.
The tail part of the combustion chamber jacket 24 is communicated with the cold air pipeline 12, the cold air flow adjusting baffle 13 on the cold air pipeline 12 realizes the adjustment of the cold air flow, part of the cold air entering the gap between the combustion chamber jacket 24 and the inner combustion chamber 18 flows downstream along the gap, and part of the cold air enters the inner combustion chamber 18 through the cooling hole 27, so that the effect of cooling the inner combustion chamber 18 and preventing the inner combustion chamber 18 from being ablated by high-temperature flame is achieved.
The flue bypass combustion chamber 4 comprises a flue bypass combustion chamber jacket 28 and a flue bypass internal combustion chamber 29, the flue bypass combustion chamber jacket 28 is arranged outside the flue bypass internal combustion chamber 29, and the wall surface of the flue bypass internal combustion chamber 29 is provided with a plurality of flue bypass cooling holes 30.
The flue gas inlet of flue bypass combustion chamber overcoat 28 is connected with its bypass pipeline 6 that corresponds, all is provided with one set of bypass gate valve 5 and bypass booster fan 7 on every bypass pipeline 6.
The outlets of the flue bypass burners 3 are introduced into a mixing main pipe 8, the mixing main pipe 8 is connected with a plurality of mixing flue branch pipes 9, the mixing flue branch pipes 9 are communicated with an original flue 1 at the outlet of an original unit coal economizer, and the mixed flue gas enters a downstream flue 2.
The bypass combustion system is provided with a plurality of groups and is symmetrically arranged on two sides of the original flue 1; the combustion system is transversely provided with a plurality of groups on the wall surface 14 of the original flue 1 so as to meet the requirements of flue gas temperature improvement and temperature field uniformity.
The number of the flue bypass combustion engines 3 is determined by the flue gas parameters of the original unit, and the number of the flue bypass combustion chambers 4, the bypass pipelines 6, the bypass gate valves 5 thereon and the bypass booster fans 7 is matched with the number of the flue bypass combustion engines 3; the mixing main pipe 8 is provided with a plurality of mixing flue branch pipes 9, and the number of the mixing flue branch pipes 9 is determined by the uniformity of the SCR inlet temperature field after the high-temperature flue gas and the flue gas of the original flue 1 are mixed.
The working method comprises the steps that in the starting stage of a unit, in order to avoid secondary deflagration of unburned carbon in a main flue of a boiler, a bypass combustion system is started, high-temperature flue gas generated by combustion of fuel by a flue bypass combustor 3 is mixed with cold flue gas in an original flue 1 and enters a downstream flue 2, the temperature of the mixed flue gas is higher than the lower limit of denitration operation temperature, the requirement of denitration operation temperature is met, denitration operation is carried out, along with the starting of the unit, the temperature of the flue gas in the original flue 1 is gradually increased, the operation power and the number of the flue bypass combustor 3 in the bypass combustion system are correspondingly reduced, and the bypass combustion system is completely withdrawn until the temperature of the flue gas at an SCR inlet of the original boiler can meet the requirement of denitration operation by itself; in a low-load operation stage (generally 20-30% of rated load) of the unit, starting a combustion system arranged on an original flue 1, wherein the bypass combustion system is not started, a combustor 10 burns fuel to generate high-temperature flue gas, the high-temperature flue gas is mixed with cold flue gas in the original flue 1 and then enters a downstream flue 2, and the temperature of the mixed flue gas is higher than the lower limit of denitration operation temperature, so that the requirement of denitration operation temperature is met; and the operation mode of the bypass combustion system is opposite to that of the start-up stage.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (10)
1. A system meeting the requirement of the operating temperature of a full-load denitration catalyst of a coal-fired thermal power generating unit comprises an original flue (1) and a downstream flue (2), wherein the original flue (1) is communicated with the downstream flue (2), and the downstream flue (2) is communicated to a denitration system; the device is characterized by further comprising a bypass combustion system and a combustion system, wherein the bypass combustion system comprises a flue bypass combustor (3) and a flue bypass combustion chamber (4), the flue bypass combustor (3) is communicated with the flue bypass combustion chamber (4), the original flue (1) is communicated with a flue gas inlet of the flue bypass combustion chamber (4) through a bypass pipeline (6), a bypass gate valve (5) and a bypass booster fan (7) are connected to the bypass pipeline (6), a flue gas outlet of the flue bypass combustion chamber (4) is communicated with a mixing main pipe (8), and the mixing main pipe (8) is communicated with the original flue (1) through a mixing flue branch pipe (9); the combustion system comprises a combustor (10) and a combustion chamber (11), the combustor (10) is communicated with the combustion chamber (11), the combustion chamber (11) is fixed with a wall surface (14) of an original flue (1) through a fixed rib plate (15), the combustion chamber (11) is connected with a cold air pipeline (12), and a cold air flow adjusting baffle (13) is connected to the cold air pipeline (12).
2. The system for meeting the operating temperature requirement of the full-load denitration catalyst of the coal-fired thermal power generating unit according to claim 1, wherein the combustor (10) is fixed on a blocking plate (22) at the tail part of the combustion chamber (11) through a fixing device (23) at the head part of the combustor (10) by bolts (21).
3. The system for meeting the operating temperature requirement of the full-load denitration catalyst of the coal-fired thermal power generating unit as claimed in claim 2, wherein the combustion chamber (11) comprises a combustion chamber outer sleeve (24) and an inner combustion chamber (18), the combustion chamber outer sleeve (24) is arranged outside the inner combustion chamber (18), the length of the combustion chamber outer sleeve (24) is greater than that of the inner combustion chamber (18), the head part of the combustion chamber (11) is provided with a flow equalizing plate (17), the flow equalizing plate (17) is made of a high-temperature resistant material, and a plurality of flow equalizing holes are formed in the flow equalizing plate (17); the inner wall of the combustion chamber outer sleeve (24) is provided with a high-temperature-resistant pouring layer (16).
4. The system for meeting the operating temperature requirement of the full-load denitration catalyst of the coal-fired thermal power generating unit as claimed in claim 3, wherein the inner combustion chamber (18) is made of a high-temperature-resistant material, and the wall surface of the inner combustion chamber is provided with a plurality of cooling holes (27); the welding of interior combustion chamber (18) is on shutoff board (22), and the outer wall of interior combustion chamber (18) has several fixed plate (26) along the axial welding, the contained angle between fixed plate (26) is 120.
5. The system for meeting the operating temperature requirement of the full-load denitration catalyst of the coal-fired thermal power generating unit according to claim 4, wherein the head part of the combustor (10) comprises an outer air sleeve (19) and an inner fuel channel (20), the outer air sleeve (19) is arranged outside the inner fuel channel (20), and an air circulation channel for the operation of the combustor (10) is formed between the outer air sleeve (19) and the inner fuel channel (20) and is used for providing oxygen required by the combustion of the fuel; and a rotational flow device (25) is also arranged in the air circulation channel.
6. The system meeting the requirement of the operating temperature of the full-load denitration catalyst of the coal-fired thermal power generating unit according to claim 1, wherein the flue bypass combustion chamber (4) comprises a flue bypass combustion chamber outer sleeve (28) and a flue bypass inner combustion chamber (29), the flue bypass combustion chamber outer sleeve (28) is arranged outside the flue bypass inner combustion chamber (29), and a plurality of flue bypass cooling holes (30) are formed in the wall surface of the flue bypass inner combustion chamber (29).
7. The system meeting the requirement on the operating temperature of the full-load denitration catalyst of the coal-fired thermal power generating unit as claimed in claim 6, wherein a flue gas inlet of the flue bypass combustion chamber outer sleeve (28) is connected with a corresponding bypass pipeline (6), and each bypass pipeline (6) is provided with a set of bypass gate valve (5) and a bypass booster fan (7).
8. The system meeting the requirement on the operating temperature of the full-load denitration catalyst of the coal-fired thermal power generating unit according to claim 1, wherein the bypass combustion systems are provided with a plurality of groups and are symmetrically arranged on two sides of the original flue (1); the combustion system is characterized in that a plurality of groups of combustion systems are transversely arranged on the wall surface (14) of the original flue (1).
9. The system meeting the requirement on the operating temperature of the full-load denitration catalyst of the coal-fired thermal power generating unit according to claim 8, wherein the number of the flue bypass combustion engines (3) is determined by the operating flue gas parameters of an original unit, and the number of the flue bypass combustion chambers (4), the bypass pipelines (6) and bypass gate valves (5) and bypass booster fans (7) on the flue bypass combustion chambers are matched with the number of the flue bypass combustion engines (3); the mixing main pipe (8) is provided with a plurality of mixing flue branch pipes (9), and the number of the mixing flue branch pipes (9) is determined by the uniformity of an SCR inlet temperature field after high-temperature flue gas and flue gas of an original flue (1) are mixed.
10. An operating method of the system for meeting the operating temperature requirement of the full-load denitration catalyst of the coal-fired thermal power generating unit according to any one of claims 1 to 9, the method is characterized in that in the starting stage of the unit, in order to avoid secondary deflagration of unburned carbon in a main flue of the boiler, a bypass combustion system is started, a flue bypass combustor (3) combusts fuel to generate high-temperature flue gas, the high-temperature flue gas and cold flue gas in an original flue (1) are mixed and enter a downstream flue (2), the temperature of the mixed flue gas is higher than the lower limit of denitration commissioning temperature, the requirement of the denitration commissioning temperature is met, denitration commissioning is carried out, the temperature of the flue gas in the original flue (1) is gradually increased along with the starting of the unit, the operation power and the number of the flue bypass combustion machines (3) in the bypass combustion system are correspondingly reduced until the flue gas temperature at the SCR inlet of the original boiler can meet the denitration operation requirement by self, and the bypass combustion system is completely withdrawn; in the low-load operation stage of the unit, a combustion system arranged on an original flue (1) is started, at the moment, a bypass combustion system is not started, a combustor (10) burns fuel to generate high-temperature flue gas, the high-temperature flue gas and cold flue gas in the original flue (1) are mixed and then enter a downstream flue (2), and the temperature of the mixed flue gas is higher than the lower limit of the denitration operation temperature, so that the denitration operation temperature requirement is met; and the operation mode of the bypass combustion system is opposite to that of the start-up stage.
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