CN111059523B - Cold-state starting method for unit - Google Patents
Cold-state starting method for unit Download PDFInfo
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- CN111059523B CN111059523B CN201911421036.6A CN201911421036A CN111059523B CN 111059523 B CN111059523 B CN 111059523B CN 201911421036 A CN201911421036 A CN 201911421036A CN 111059523 B CN111059523 B CN 111059523B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
- F22B35/14—Control systems for steam boilers for steam boilers of forced-flow type during the starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers
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Abstract
The invention discloses a unit cold-state starting method, relates to the technical field of unit equipment, can effectively solve the problems of long time consumption, high cost and the like of the cold-state starting of the conventional generator set, and simultaneously meets the requirement of successfully starting the cold-state unit once after environmental protection data of the unit reaches the standard. The main technical scheme of the invention is as follows: a cold-state starting method of a unit comprises the following steps: starting a water supply system and heating water; starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; supplying oil for ignition, and performing powder feeding operation on the first coal mill; introducing ammonia gas discontinuously; and (5) grid connection of the unit, and starting a second coal mill to operate.
Description
Technical Field
The invention relates to the technical field of unit equipment, in particular to a cold-state starting method of a unit.
Background
The unit is operated under a large load for a long period, the loss of equipment in different degrees is aggravated, the unit needs to be shut down for maintenance after the loss of the equipment reaches a certain degree, the maintenance frequency of the unit is more, cold-state starting is a starting mode when the unit is turned into an operating state after maintenance or long-term standby, the normal time is longer, the national environmental protection requires that the NOX of the unit exceeds the standard in the cold-state starting period for not more than 8 hours, and the average value of the unit in the whole day does not exceed 50mg/m 3. The unit cold start is difficult to complete the target value at one time, the prior art usually adopts the unit start and the shutdown equipment after the turbine run is completed, the unit start is carried out in a mode of switching the shutdown state of the unit from the original cold start state to the hot start state and then carrying out secondary start on the unit on the next day, so that the unit start consumes long time and high cost, the safety aspects of metal fatigue and the like caused by the change of the thermal stress of heavy equipment consisting of metal structures are greatly influenced, and the huge direct and indirect economic losses of enterprises are caused.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a method for starting a unit in a cold state, which can effectively solve the problems of long time consumption, high cost and the like in the current generator set in a cold state, and at the same time, environmental protection data of a unit in single start reaches the standard, thereby meeting the requirement of successfully starting the unit in a cold state at one time.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a cold-state starting method of a unit, which comprises the following steps:
step 1: starting a water supply system and heating water;
step 2: starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater;
and step 3: supplying oil for ignition, and performing powder feeding operation on the first coal mill;
and 4, step 4: introducing ammonia gas discontinuously;
and 5: and (5) grid connection of the unit, and starting a second coal mill to operate.
Preferably, the step 1 comprises:
controlling the temperature difference between the water supply temperature and the steam drum wall to be less than 50 ℃;
the water supply time is 2 to 4 hours, and the water level is-30 to 30 mm;
the water temperature of the deaerator is 100-170 ℃;
and starting a heating system at the bottom of the hearth to heat water in the furnace, gradually closing the air valve when the temperature of the steam drum wall reaches 120 ℃ and the pressure of the steam drum is 0.2Mpa, and closing the heating system when the pressure of the steam drum is 0.5 Mpa.
Preferably, the step 2 comprises:
starting a draught fan and a blower to enable hot air to circularly flow in the furnace;
adjusting the air quantity to purge the hearth;
after the purging is finished, the air quantity is reduced, and the negative pressure of the hearth is controlled to be between-50 pa and-150 pa.
Preferably, the step 3 comprises:
controlling the fuel pressure between 3.0Mpa and 3.5Mpa, and heating and boosting the boiler by an oil gun;
the oxygen content of the desulfurization outlet is controlled to be 19-21 percent;
when the denitration smoke temperature reaches 140 ℃, a first fan air heater and a plasma air heater are started, a sealing fan and the first fan are started, and the air pressure of the first fan is adjusted until the coal mill is heated and ground after the air pressure is stabilized.
Preferably, the step 3 further comprises:
carrying out arc discharge treatment on the plasma igniter;
starting a first coal mill to feed powder into the boiler, controlling the pressure increasing speed to be 0.5-1 MPa/min and the temperature increasing speed to be 1.5 ℃/min;
controlling the oxygen content at the desulfurization outlet to be 15-19%.
Preferably, the step 4 comprises:
before oil supply and ignition, a denitration sound wave soot blower is put in, and when the temperature of the flue gas at a desulfurization inlet reaches 200 ℃, an ammonia supply system is intermittently put in to control the concentration of nitrogen oxide at an outlet.
Preferably, the intermittent ammonia supply system comprises: adjusting the valve to 5%, setting the input time to 1 minute, closing the valve after the time is reached, performing the second input after 3 minutes, and repeating the steps until the temperature of the flue gas at the desulfurization inlet reaches 280 ℃.
Preferably, the step 5 comprises:
when the unit parameters reach the rush condition, the main steam temperature and reheating temperature rising speed are controlled to be 1-1.5 ℃/min;
continuously feeding the denitration inlet smoke into an ammonia supply system when the temperature of the denitration inlet smoke reaches above 280 ℃;
the unit is connected to the grid, and a second coal mill is started to perform low-load warm-up operation;
increasing the load of the unit, starting the rest coal mills to operate, raising the temperature of the denitration inlet flue gas to be above 320 ℃, and controlling the escape rate of the denitrified ammonia to be less than 3 ppm.
Compared with the prior art, the invention has the following technical effects:
the technical scheme provided by the embodiment of the invention comprises the following steps: starting a water supply system and heating water; starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; supplying oil for ignition, and performing powder feeding operation on the first coal mill; introducing ammonia gas discontinuously; compared with the prior art, the method adopts a mode that the unit is started, the turbine is stopped after the completion of the running, the starting operation is carried out in a mode that the unit is switched from an original cold starting state to a hot starting state and then the secondary starting is carried out when the unit is stopped on the second day, thereby causing long time and high cost for starting the unit, has great influence on the safety aspects of metal fatigue and the like caused by the change of the thermal stress of the major equipment consisting of the metal structure, simultaneously causes huge direct and indirect economic losses of enterprises, in the technical scheme, the cold-state starting of the unit can realize the flushing-to-grid connection of the unit once, reduces the starting times of the unit, ensures that the unit is successfully started at one time, the method meets the requirement of reaching the standard of environmental protection data, shortens the cold start time of the generator set, saves the start cost, has good economic benefit and environmental protection benefit, and is simple in process and easy to realize industrially.
Drawings
Fig. 1 is a schematic flow chart of a cold start method of a unit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The method for starting the generator set in the cold state can effectively solve the problems of long time consumption, high cost and the like of the existing generator set in the cold state, and meanwhile, environmental protection data of single start of the generator set reach the standard, and the requirement of successfully starting the generator set in the cold state at one time is met.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment of the invention provides a unit cold-state starting method, which comprises the following steps: s01: starting a water supply system and heating water; s02: starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; s03: supplying oil for ignition, and performing powder feeding operation on the first coal mill; s04: introducing ammonia gas discontinuously; s05: and (5) grid connection of the unit, and starting a second coal mill to operate.
By adopting the unit cold-state starting method provided by the embodiment, the water supply system is started, and water is heated; then starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; supplying oil to the boiler, igniting, and feeding powder to a first coal mill; then ammonia is intermittently introduced to control the concentration of the nitrogen oxide at the outlet; then the unit is connected to the grid, the second coal mill is started to run, compared with the prior art, the method adopts a mode of stopping the equipment after the unit is started and the turbine is started to run, starting the equipment after the unit is stopped on the second day, and the unit is switched from the original cold start state to the hot start state and then is started for the second time, so that the starting time and the cost of the unit are long, the safety aspects of the important equipment consisting of a metal structure, such as thermal stress change, metal fatigue and the like, are greatly influenced, and huge direct and indirect economic losses of enterprises are caused simultaneously. Is easy to realize industrially.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 1 includes:
controlling the temperature difference between the water supply temperature and the steam drum wall to be less than 50 ℃;
the water supply time in summer is 2 hours, and the water level is-30 mm;
the water temperature of the deaerator is 100 ℃;
and starting a heating system at the bottom of the hearth to heat water in the furnace, gradually closing the air valve when the temperature of the steam drum wall reaches 120 ℃ and the pressure of the steam drum is 0.2Mpa, and closing the heating system when the pressure of the steam drum is 0.5 Mpa.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 2 includes:
starting a draught fan and a blower to enable hot air to circularly flow in the furnace;
adjusting the air quantity to purge the hearth, and opening a baffle of a flue to enable hot air to flow in the furnace;
after the purging is finished, the air quantity is reduced, and the negative pressure of the hearth is controlled to be-50 pa.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 3 includes:
putting a denitration sound wave soot blower;
controlling the fuel pressure at 3.0Mpa, and putting 3 oil guns to heat and boost the boiler;
the oxygen content of the desulfurization outlet is controlled to be more than 19 percent;
when the denitration smoke temperature reaches 140 ℃, starting a first fan air heater and a plasma air heater, starting a sealing fan and the first fan, and performing warm grinding on the coal mill after adjusting the air pressure of the first fan until the air pressure is stable;
carrying out arc discharge treatment on the plasma igniter;
starting a first coal mill to feed powder into the boiler, and controlling the pressure increasing speed to be 0.5MPa/min and the temperature increasing speed to be 1 ℃/min;
controlling the desulfurization outlet oxygen amount to be 19 percent.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 4 includes:
when the temperature of the desulfurization inlet smoke reaches 200 ℃, discontinuously putting into an ammonia supply system, and controlling the concentration of the outlet nitrogen oxides, wherein the discontinuously putting into the ammonia supply system comprises: adjusting the valve to 5%, setting the input time to 1 minute, closing the valve after the time is reached, performing the second input after 3 minutes, and repeating the steps until the temperature of the flue gas at the desulfurization inlet reaches 280 ℃.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 5 includes:
when the unit parameters reach the rush condition, the main steam temperature and reheating temperature rising speed is controlled to be 1 ℃/min;
continuously feeding the denitration inlet smoke into an ammonia supply system when the temperature of the denitration inlet smoke reaches above 280 ℃;
the unit is connected to the power grid, a second coal mill is started to perform low-load warm-up operation, the coal amount of the coal mill is increased, the flame center moves upwards, the smoke amount is increased, the smoke temperature is improved, the denitration efficiency is improved, and the air preheater is prevented from being blocked;
when the expansion difference of the steam turbine is stable and has a descending trend and good thermal expansion, the load of the unit is gradually increased, the residual coal mill is started to operate, the temperature of the denitration inlet flue gas is increased to be more than 320 ℃, and the escape rate of the denitrified ammonia is controlled to be less than 3 ppm.
Example 2
The embodiment of the invention provides a unit cold-state starting method, which comprises the following steps: s01: starting a water supply system and heating water; s02: starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; s03: supplying oil for ignition, and performing powder feeding operation on the first coal mill; s04: introducing ammonia gas discontinuously; s05: and (5) grid connection of the unit, and starting a second coal mill to operate.
By adopting the unit cold-state starting method provided by the embodiment, the water supply system is started, and water is heated; then starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; supplying oil to the boiler, igniting, and feeding powder to a first coal mill; then ammonia is intermittently introduced to control the concentration of the nitrogen oxide at the outlet; then the unit is connected to the grid, the second coal mill is started to run, compared with the prior art, the method adopts a mode of stopping the equipment after the unit is started and the turbine is started to run, starting the equipment after the unit is stopped on the second day, and the unit is switched from the original cold start state to the hot start state and then is started for the second time, so that the starting time and the cost of the unit are long, the safety aspects of the important equipment consisting of a metal structure, such as thermal stress change, metal fatigue and the like, are greatly influenced, and huge direct and indirect economic losses of enterprises are caused simultaneously. Is easy to realize industrially.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 1 includes:
controlling the temperature difference between the water supply temperature and the steam drum wall to be less than 50 ℃;
the water supply time in winter is 4 hours, and the water level is 30 mm;
the water temperature of the deaerator is 170 ℃;
and starting a heating system at the bottom of the hearth to heat water in the furnace, gradually closing the air valve when the temperature of the steam drum wall reaches 120 ℃ and the pressure of the steam drum is 0.2Mpa, and closing the heating system when the pressure of the steam drum is 0.5 Mpa.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 2 includes:
starting a draught fan and a blower to enable hot air to circularly flow in the furnace;
adjusting the air quantity to purge the hearth, and opening a baffle of a flue to enable hot air to flow in the furnace;
after the purging is finished, the air quantity is reduced, and the negative pressure of the hearth is controlled to be-150 pa.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 3 includes:
putting a denitration sound wave soot blower;
controlling the pressure of fuel oil at 3.5Mpa, and putting 3 oil guns to heat and boost the boiler;
the oxygen content of the desulfurization outlet is controlled to be more than 19 percent;
when the denitration smoke temperature reaches 140 ℃, starting a first fan air heater and a plasma air heater, starting a sealing fan and the first fan, and performing warm grinding on the coal mill after adjusting the air pressure of the first fan until the air pressure is stable;
carrying out arc discharge treatment on the plasma igniter;
starting a first coal mill to feed powder into the boiler, and controlling the pressure increasing speed to be 0.5MPa/min and the temperature increasing speed to be 1 ℃/min;
controlling the oxygen content at the desulfurization outlet within 15 percent.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 4 includes:
when the temperature of the desulfurization inlet smoke reaches 200 ℃, discontinuously putting into an ammonia supply system, and controlling the concentration of the outlet nitrogen oxides, wherein the discontinuously putting into the ammonia supply system comprises: adjusting the valve to 5%, setting the input time to 1 minute, closing the valve after the time is reached, performing the second input after 3 minutes, and repeating the steps until the temperature of the flue gas at the desulfurization inlet reaches 280 ℃.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 5 includes:
when the unit parameters reach the rush condition, the main steam temperature and reheating temperature rising speed are controlled to be 0.5 ℃/min;
continuously feeding the denitration inlet smoke into an ammonia supply system when the temperature of the denitration inlet smoke reaches above 280 ℃;
the unit is connected to the power grid, a second coal mill is started to perform low-load warm-up operation, the coal amount of the coal mill is increased, the flame center moves upwards, the smoke amount is increased, the smoke temperature is improved, the denitration efficiency is improved, and the air preheater is prevented from being blocked;
when the expansion difference of the steam turbine is stable and has a descending trend and good thermal expansion, the load of the unit is gradually increased, the load of the unit is increased, the residual coal mill is started to operate, the temperature of the flue gas at the denitration inlet is increased to be above 320 ℃, and the escape rate of denitrified ammonia is controlled to be less than 3 ppm.
Example 3
The embodiment of the invention provides a unit cold-state starting method, which comprises the following steps: s01: starting a water supply system and heating water; s02: starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; s03: supplying oil for ignition, and performing powder feeding operation on the first coal mill; s04: introducing ammonia gas discontinuously; s05: and (5) grid connection of the unit, and starting a second coal mill to operate.
By adopting the unit cold-state starting method provided by the embodiment, the water supply system is started, and water is heated; then starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater; supplying oil to the boiler, igniting, and feeding powder to a first coal mill; then ammonia is intermittently introduced to control the concentration of the nitrogen oxide at the outlet; then the unit is connected to the grid, the second coal mill is started to run, compared with the prior art, the method adopts a mode of stopping the equipment after the unit is started and the turbine is started to run, starting the equipment after the unit is stopped on the second day, and the unit is switched from the original cold start state to the hot start state and then is started for the second time, so that the starting time and the cost of the unit are long, the safety aspects of the important equipment consisting of a metal structure, such as thermal stress change, metal fatigue and the like, are greatly influenced, and huge direct and indirect economic losses of enterprises are caused simultaneously. Is easy to realize industrially.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 1 includes:
controlling the temperature difference between the water supply temperature and the steam drum wall to be less than 50 ℃;
the water supply time in winter is 4 hours, and the water level is 30 mm;
the water temperature of the deaerator is 130 ℃;
and starting a heating system at the bottom of the hearth to heat water in the furnace, gradually closing the air valve when the temperature of the steam drum wall reaches 120 ℃ and the pressure of the steam drum is 0.2Mpa, and closing the heating system when the pressure of the steam drum is 0.5 Mpa.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 2 includes:
starting a draught fan and a blower to enable hot air to circularly flow in the furnace;
adjusting the air quantity to purge the hearth, and opening a baffle of a flue to enable hot air to flow in the furnace;
after the purging is finished, the air quantity is reduced, and the negative pressure of the hearth is controlled to be-100 pa.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 3 includes:
putting a denitration sound wave soot blower;
controlling the fuel pressure at 3.2Mpa, and putting 3 oil guns to heat and boost the boiler;
the oxygen content of the desulfurization outlet is controlled to be more than 19 percent;
when the denitration smoke temperature reaches 140 ℃, starting a first fan air heater and a plasma air heater, starting a sealing fan and the first fan, and performing warm grinding on the coal mill after adjusting the air pressure of the first fan until the air pressure is stable;
carrying out arc discharge treatment on the plasma igniter;
starting a first coal mill to feed powder into the boiler, and controlling the pressure increasing speed to be 0.5MPa/min and the temperature increasing speed to be 1 ℃/min;
controlling the desulfurization outlet oxygen amount within 18.5 percent.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 4 includes:
when the temperature of the desulfurization inlet smoke reaches 200 ℃, discontinuously putting into an ammonia supply system, and controlling the concentration of the outlet nitrogen oxides, wherein the discontinuously putting into the ammonia supply system comprises: adjusting the valve to 5%, setting the input time to 1 minute, closing the valve after the time is reached, performing the second input after 3 minutes, and repeating the steps until the temperature of the flue gas at the desulfurization inlet reaches 280 ℃.
In order to further optimize the above technical solution, preferably on the basis of the above embodiment, in the starting method, the step 5 includes:
when the unit parameters reach the rush condition, the main steam temperature and reheating temperature rising speed are controlled to be 0.5 ℃/min;
continuously feeding the denitration inlet smoke into an ammonia supply system when the temperature of the denitration inlet smoke reaches above 280 ℃;
the unit is connected to the power grid, a second coal mill is started to perform low-load warm-up operation, the coal amount of the coal mill is increased, the flame center moves upwards, the smoke amount is increased, the smoke temperature is improved, the denitration efficiency is improved, and the air preheater is prevented from being blocked;
when the expansion difference of the steam turbine is stable and has a descending trend and good thermal expansion, the load of the unit is gradually increased, the load of the unit is increased, the residual coal mill is started to operate, the temperature of the flue gas at the denitration inlet is increased to be above 320 ℃, and the escape rate of denitrified ammonia is controlled to be less than 3 ppm.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. A cold-state starting method of a unit is characterized by comprising the following steps:
step 1: starting a water supply system and heating water;
step 2: starting an induced air system to pre-warm the pipelines of the air preheater, the superheater and the reheater;
and step 3: putting a denitration sound wave soot blower; controlling the fuel pressure between 3.0Mpa and 3.5Mpa, and heating and boosting the boiler by an oil gun;
the oxygen content of the desulfurization outlet is controlled to be 19-21 percent;
when the denitration smoke temperature reaches 140 ℃, starting a first fan air heater and a plasma air heater, starting a sealing fan and the first fan, and performing warm grinding on the coal mill after adjusting the air pressure of the first fan until the air pressure is stable;
and 4, step 4: when the temperature of the flue gas at the desulfurization inlet reaches 200 ℃, adjusting the valve by 5 percent, setting the input time to be 1 minute, closing the valve after the time is reached, carrying out the second input after 3 minutes, repeating the steps until the temperature of the flue gas at the desulfurization inlet reaches 280 ℃, and controlling the concentration of the nitrogen oxide at the outlet;
and 5: and (5) grid connection of the unit, and starting a second coal mill to operate.
2. A cold start method of a unit according to claim 1,
the step 1 comprises the following steps:
controlling the temperature difference between the water supply temperature and the steam drum wall to be less than 50 ℃;
the water supply time is 2 to 4 hours, and the water level is-30 to 30 mm;
the water temperature of the deaerator is 100-170 ℃;
and starting a heating system at the bottom of the hearth to heat water in the furnace, gradually closing the air valve when the temperature of the steam drum wall reaches 120 ℃ and the pressure of the steam drum is 0.2Mpa, and closing the heating system when the pressure of the steam drum is 0.5 Mpa.
3. A cold start method of a unit according to claim 1,
the step 2 comprises the following steps:
starting a draught fan and a blower to enable hot air to circularly flow in the furnace;
adjusting the air quantity to purge the hearth;
after the purging is finished, the air quantity is reduced, and the negative pressure of the hearth is controlled to be between-50 pa and-150 pa.
4. A cold start method of a unit according to claim 1,
the step 3 further comprises:
carrying out arc discharge treatment on the plasma igniter;
starting a first coal mill to feed powder into a boiler, controlling the pressure increasing speed to be 0.5-1 MPa/min and the temperature increasing speed to be 1-1.5 ℃/min;
controlling the desulfurization outlet oxygen amount to be 15-19%.
5. A cold start method of a unit according to claim 1,
the step 5 comprises the following steps:
when the unit parameters reach the rush condition, the main steam temperature and reheating temperature rising speed are controlled to be 1-1.5 ℃/min;
continuously feeding the denitration inlet smoke into an ammonia supply system when the temperature of the denitration inlet smoke reaches above 280 ℃;
the unit is connected to the grid, and a second coal mill is started to perform low-load warm-up operation;
increasing the load of the unit, starting the rest coal mills to operate, raising the temperature of the denitration inlet flue gas to be above 320 ℃, and controlling the escape rate of the denitrified ammonia to be less than 3 ppm.
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