CN105771644B - The prevention method that a kind of SCR denitration system pyrolysis oven internal crystallization comes off - Google Patents
The prevention method that a kind of SCR denitration system pyrolysis oven internal crystallization comes off Download PDFInfo
- Publication number
- CN105771644B CN105771644B CN201610134808.8A CN201610134808A CN105771644B CN 105771644 B CN105771644 B CN 105771644B CN 201610134808 A CN201610134808 A CN 201610134808A CN 105771644 B CN105771644 B CN 105771644B
- Authority
- CN
- China
- Prior art keywords
- pyrolysis oven
- temperature
- pyrolysis
- boiler
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- B01D53/90—Injecting reactants
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention provides the prevention method that a kind of SCR denitration system pyrolysis oven internal crystallization comes off, and SCR denitration system pyrolysis oven internal crystallization can be avoided to come off, and blocks pyrolysis outlet of still.The described method includes：By the switch-mode regulation of the pyrolysis wind inlet regulating valve of pyrolysis oven to opening state；Temperature and pyrolysis oven internal temperature to pyrolysis oven exit are measured in real time, if the temperature in pyrolysis oven exit is less than the first preset temperature, the temperature in pyrolysis oven exit is improved to the first preset temperature；If pyrolysis oven internal temperature is less than the second preset temperature, pyrolysis oven internal temperature is improved to the second preset temperature.The present invention is suitable for gas denitrifying technology field.
Description
Technical field
The present invention relates to gas denitrifying technology field, particularly relates to a kind of SCR denitration system pyrolysis oven internal crystallization and comes off
Prevention method.
Background technology
In June, 2012, to reduce the discharge of power-plant flue gas pollutant, promotes local economic development, environmental protection and into one
Step improves the quality of air environment of power plant and surrounding area, and denitrating flue gas transformation, denitration system are implemented in certain power plant to No. 5 stoves of 3 phase
System uses selective catalytic reduction (Selective Catalytic Reduction, SCR), using urea as reducing agent, warp
After pyrolysis, heating and atomization, spray into flue gas, and NOx under the action of catalyst, generates free of contamination gas discharge in flue gas
Into air.When the gas treatment ability of SCR equipment for denitrifying flue gas in SCR denitration system is corresponding boiler BMCR operating modes
100% exhaust gas volumn, denitration efficiency >=80%；NOx emission concentration is no more than 100mg/Nm3, and the escapement ratio of ammonia is not more than 3ppm.
SCR equipment for denitrifying flue gas includes：Urea supply system, urea dissolution system, pyrolysis oven, catalyst, SCR reactions
The structures such as device, pressure fan and primary air fan.SCR equipment for denitrifying flue gas is arranged between boiler economizer and air preheater, SCR reactions
Device is located at the top of pressure fan and primary air fan, and SCR equipment for denitrifying flue gas uses cellular catalyst, according to " 2+1 " pattern cloth
Put, SCR reactors installation blow device, using acoustic wave ash ejector.
In urea dissolution system, urea granules are transported to urea granules storehouse through bucket elevator, then by middle warehouse
It is sent in dissolving tank.Dry urea is dissolved into the urea liquid of 55% mass concentration by demineralized water, also passes through urea liquid mixing pump
Urea liquid is sent in urea solution tank.Urea liquid is constantly followed by circulating pump between metering distribution module and urea tank
Ring.
Urea liquid is evaporated to ammonia in pyrolysis oven, and the air/ammonia gas mixture for being pyrolyzed outlet of still is sent into respectively through main pipe
Branched pipe, the mixed gas in branched pipe is sprayed into flue through ammonia injection grid to be sufficiently mixed with flue gas, flows into SCR reactors.
After reaction temperature reaches necessarily, the Catalytic Layer of SCR reactors, ammonia and NOx are flowed through with the well-mixed flue gas stream of ammonia
NOx, is reduced to harmless N2 and H2O by generation catalytic reduction reaction.
On 2 18th, 2015, there is pyrolysis oven internal pressure and jumps in whens No. 5 stove denitrating system normal operations, exit
Sudden temperature drop, pyrolysis primary air flow decline, and are pyrolyzed air/ammonia gas mixture pressure of outlet of still and reduce, SCR reactor outlets
NOx concentration substantially reduces, and the escaping of ammonia increased dramatically, and spray ammonia reduces phenomenon automatically.After half an hour, all Parameter reconstructions are normal.Root
Analyzed according to above-mentioned phenomenon, be judged as that inhomogeneities crystallization occurs inside No. 5 stove denitrating system pyrolysis ovens, come off, block heat
Solve outlet of still part.Due to environmental requirement, forbid unit that the denitrating system of normal operation is artificially out of service, so not timely
Pyrolysis oven Crystallization Plugging is handled.Hereafter, at regular intervals, above-mentioned phenomenon occurs once, and occurrence frequency is also more next
It is more frequent.March 29 leaf, since online load is lighter, unit load is down to 300MW, and smoke temperature is low to cause denitrating system to solve automatically
Row, service personnel utilize this opportunity, open pyrolysis oven inspection door, it is found that pyrolysis oven internal crystallization is serious.
The content of the invention
The technical problem to be solved in the present invention is to provide the prevention side that a kind of SCR denitration system pyrolysis oven internal crystallization comes off
Method, is come off with solving the SCR denitration system pyrolysis oven internal crystallization present in the prior art, blocks the problem of being pyrolyzed outlet of still.
Come off in order to solve the above technical problems, the embodiment of the present invention provides a kind of SCR denitration system pyrolysis oven internal crystallization
Prevention method, including：
By the switch-mode regulation of the pyrolysis wind inlet regulating valve of pyrolysis oven to opening state；
Temperature and pyrolysis oven internal temperature to pyrolysis oven exit are measured in real time, if the temperature in pyrolysis oven exit
Less than the first preset temperature, then the temperature in pyrolysis oven exit is improved to the first preset temperature；If pyrolysis oven internal temperature is low
In the second preset temperature, then pyrolysis oven internal temperature is improved to the second preset temperature.
Further, the temperature to pyrolysis oven exit, which carries out measurement in real time, includes：
Temperature measuring point is set on the outer wall in pyrolysis oven exit, by the temperature measuring point to the temperature in pyrolysis oven exit into
Row measurement in real time.
Further, the method further includes：
If the measurement temperature of the temperature measuring point is less than the first preset temperature, starts warning device and issue warning signal.
Further, the method further includes：
Air/ammonia gas mixture the regulating valve for adjusting pyrolysis outlet of still causes all air/ammonia gas mixture regulating valve
In opening state.
Further, the method further includes：
When the NOx concentration of SCR reactor outlets is less than or equal to preset standard value, closing the automatic of urea spray gun reduces spray
Ammonia amount function.
Further, the method further includes：
Switching disturbances are carried out to the air/ammonia gas mixture regulating valve in pyrolysis oven exit according to default frequency；
Pyrolysis oven internal crystallization is purged using variable air rate mode, pyrolysis oven internal crystallization is blown off.
Further, the method further includes：
According to the variation tendency of boiler load, the coal used using the method for coal mixing combustion boiler with mixing, obtain
The new coal used for the boiler.
Further, the variation tendency according to boiler load, the coal used using the method for coal mixing combustion boiler
Carry out with mix including：
Obtain the operating parameter and performance parameter of boiler；
According to the operating parameter and performance parameter of the boiler got, and combine coal blending boundary condition and the same day all kinds of coals
Quantity in stock, determines that matching somebody with somebody for all kinds of coals is mixed than row and dosage；
Wherein, the coal blending boundary condition includes：It is single with coal restrictive condition and border mark.
Further, the operating parameter includes：The tube wall temperature of boiler, combustion chamber draft, main steam temperature and pressure,
One or more of in the temperature and pressure of reheated steam, coal pulverizer outlet wind-warm syndrome；
The performance parameter of the boiler includes：The current operational efficiency of boiler, power generation standard coal consumption and supply standard coal consumption
One or more of.
Further, control pyrolysis oven internal temperature to be more than or equal to 420 DEG C, while control the temperature in pyrolysis oven exit to be
380℃。
The above-mentioned technical proposal of the present invention has the beneficial effect that：
In such scheme, by by the switch-mode regulation of the pyrolysis wind inlet regulating valve of pyrolysis oven to opening state；It is right at the same time
The temperature and pyrolysis oven internal temperature in pyrolysis oven exit are measured in real time, if the temperature in pyrolysis oven exit is pre- less than first
If temperature, then the temperature in pyrolysis oven exit is improved to the first preset temperature；If pyrolysis oven internal temperature is default less than second
Temperature, then improve pyrolysis oven internal temperature to the second preset temperature.In this way, by opening all pyrolysis wind inlet regulating valves
To increase pyrolysis primary air flow, so as to improve the pyrolysis ability of pyrolysis oven；At the same time also by improving pyrolysis oven internal temperature into one
Step improves the pyrolysis ability of pyrolysis oven, and when can avoid the ammonia spraying amount from changing, pyrolysis oven outlet temperature declines excessive, is pyrolyzed
Not exclusively cause pyrolysis oven internal crystallization to come off, block pyrolysis outlet of still.
Brief description of the drawings
Fig. 1 is the method for the prevention method that SCR denitration system pyrolysis oven internal crystallization provided in an embodiment of the present invention comes off
Flow chart.
Embodiment
To make the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
In order to understand pyrolysis oven internal crystallization reason, first No. 5 stove SCR denitration systems are analyzed, are investigated：
It can obtain according to investigations, which surpasses using the 600MW that Shanghai Furnace Factory Co., Ltd produces faces
Boundary's pressure direct-flow boiler, the boiler are supercritical parameter variable-pressure operation spirally-wound tubes Once-through Boiler, are fired using single burner hearth quadrangle tangential circle
Burning mode, a resuperheat, balanced draft, dry ash extraction, all steel framework overhung construction, outdoor arrangement, Π type coal-burning boilers,
Boiler uses Huainan locality coal, and design coal is one pit coal of Huainan Pan, and check coal is Huainan Xin Ji pit coals, and small part uses outer
Carry out coal.
No. 5 stove SCR denitration systems put into operation after the completion of being transformed in June, 2012, and the time more than 2 years does not occur above-mentioned existing
As, analysis obtains reason and is, several years ago since online night load is relatively low, smoke temperature does not reach SCR denitration system input condition,
And denitrating system often automatically exits from running at night；In denitrating system stopping spray ammonia out of service, pyrolysis wind is all the time logical
Enter state, so inside pyrolysis oven when crystallizing, also can by slowly pyrolysis completely, will not cause it is more long-pending inside pyrolysis oven more
It is more, fall off phenomenon.But No. 5 stoves are after overhaul in November, 2014, in view of the stringent control denitrating system off-the-line of country
Run time, so automatic parallel off phenomenon does not occur always for No. 5 stove SCR denitration systems, SCR denitration system long-play, leads
The crystallization of pyrogenicity solution furnace interior is more and more, finally falls off, blocks pyrolysis outlet of still phenomenon, causes denitrating system normal
Operation, NOx emission are exceeded.
To sum up, obtaining pyrolysis oven internal crystallization reason in No. 5 stove SCR denitration systems includes 6 aspects：
1) coal-fired performance off-design value, boiler design uses 5000 kilocalorie coals quality, but reality uses 4200- for a long time
The coal of 4500 kilocalories, causes the actual ammonia spraying amount of denitration bigger than normal.Since pyrolysis First air dust burdening is also greater than normal value, in heat
Crystalline solid is formed in solution stove to be attached on pyrolysis oven inner wall；
2) pyrolysis oven insulation is bad, and after having a weld leakage, maintenance to be handled in pyrolysis oven lower part, insulation recovers endless
Entirely, cause pyrolysis oven heat dissipation increase, decline temperature in pyrolysis oven, cause internal ammonia to be crystallized in leak, and cause more to tie
It is more；
3) it is less than normal to be pyrolyzed primary air flow, pyrolysis primary air flow measuring point is easily blocked, and when ammonia spraying amount changes, pyrolysis air quantity becomes
Changing less, operations staff fails to find that taken in conjunction is handled in time, also fails to adjust pyrolysis primary air flow according to the change of ammonia spraying amount,
Cause urea liquid pyrolysis incomplete, in pyrolysis oven internal crystallization；
4) pyrolysis oven intake swirler is worn, and pyrolysis oven entrance is equipped with cyclone, makes to enter pyrolysis oven pyrolysis wind in stove
Rotation, is fully pyrolyzed urea, since cyclone is worn, makes to enter the pyrolysis wind flow in pyrolysis oven and non-uniform phenomenon occurs, lead
Cause urea liquid pyrolysis incomplete, in pyrolysis oven internal crystallization；
5) temperature control in pyrolysis oven exit is too low, in unit varying duty, when ammonia spraying amount changes, due to pyrolysis
First air electric heater is slow from motion tracking, causes pyrolysis oven internal temperature to decline more, causes urea pyrolysis incomplete, in heat
Solve and crystallization is formed in stove；
6) after No. 5 stove denitrating systems terminate to overhaul in November, 2014, full load section puts into operation all the time, causes
Crystallization caused by stating reason is accumulated in pyrolysis oven, final that the excessive generation to come off and block exception of crystallization occurs.
For above-mentioned reason, the present invention comes off for existing SCR denitration system pyrolysis oven internal crystallization, blocks pyrolysis oven
A kind of the problem of outlet, there is provided the prevention method that SCR denitration system pyrolysis oven internal crystallization comes off.
Embodiment one
Referring to the prevention that shown in Fig. 1, a kind of SCR denitration system pyrolysis oven internal crystallization provided in an embodiment of the present invention comes off
Method, including：
S1：By the switch-mode regulation of the pyrolysis wind inlet regulating valve of pyrolysis oven to opening state；
S2：Temperature and pyrolysis oven internal temperature to pyrolysis oven exit are measured in real time, if pyrolysis oven exit
Temperature is less than the first preset temperature, then improves the temperature in pyrolysis oven exit to the first preset temperature；If temperature inside pyrolysis oven
Degree is less than the second preset temperature, then improves pyrolysis oven internal temperature to the second preset temperature.
The prevention method that SCR denitration system pyrolysis oven internal crystallization described in the embodiment of the present invention comes off, by that will be pyrolyzed
The switch-mode regulation of the pyrolysis wind inlet regulating valve of stove is to opening state；At the same time to the temperature and pyrolysis oven in pyrolysis oven exit inside
Temperature is measured in real time, if the temperature in pyrolysis oven exit is less than the first preset temperature, by the temperature in pyrolysis oven exit
Improve to the first preset temperature；If pyrolysis oven internal temperature is less than the second preset temperature, by pyrolysis oven internal temperature improve to
Second preset temperature.In this way, increase pyrolysis primary air flow by opening all pyrolysis wind inlet regulating valves, so as to improve heat
Solve the pyrolysis ability of stove；The pyrolysis ability of pyrolysis oven is also further improved by improving pyrolysis oven internal temperature at the same time, can be kept away
When exempting from ammonia spraying amount change, pyrolysis oven outlet temperature declines excessively, appearance, which is pyrolyzed, not exclusively causes pyrolysis oven internal crystallization to come off,
Block pyrolysis outlet of still.
In the embodiment of the present invention, in order to further improve the pyrolysis ability of pyrolysis oven, pyrolysis oven internal temperature need to be controlled big
In equal to 420 DEG C, while it is 380 DEG C to control the temperature in pyrolysis oven exit, it is preferable that first preset temperature is 380 DEG C,
Second preset temperature is 420 DEG C；The temperature in former No. 5 stove SCR denitration system pyrolysis oven exits is 350 DEG C, in this way, can be with
The temperature in No. 5 stove SCR denitration system pyrolysis oven exits is improved to 380 DEG C, while controls pyrolysis oven internal temperature not low
In 420 DEG C, to improve the pyrolysis ability of pyrolysis oven, avoid pyrolysis oven internal crystallization from coming off, block pyrolysis outlet of still.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the temperature to pyrolysis oven exit, which carries out measurement in real time, to be included：
Temperature measuring point is set on the outer wall in pyrolysis oven exit, by the temperature measuring point to the temperature in pyrolysis oven exit into
Row measurement in real time, can be in time to the temperature in pyrolysis oven exit when the temperature in pyrolysis oven exit is less than the first preset temperature
Degree is adjusted so that and the temperature in pyrolysis oven exit is improved to the first preset temperature, so that the pyrolysis ability of pyrolysis oven is improved,
Avoid pyrolysis oven internal crystallization from coming off, block pyrolysis outlet of still.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the method further include：
If the measurement temperature of the temperature measuring point is less than the first preset temperature, starts warning device and issue warning signal.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the method further include：
Air/ammonia gas mixture the regulating valve for adjusting pyrolysis outlet of still causes all air/ammonia gas mixture regulating valve
In opening state, so as to reduce pyrolysis oven internal pressure, ensure that air/ammonia gas mixture passage is unimpeded.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the method further include：
When the NOx concentration of SCR reactor outlets is less than or equal to preset standard value, closing the automatic of urea spray gun reduces spray
Ammonia amount function.
In the embodiment of the present invention, when each execution reduces ammonia spraying amount measure, stable in SCR denitration system, SCR is anti-
Answer on the premise of device exit NOx concentration is no more than preset standard value, releasing the automatic of urea spray gun reduces ammonia spraying amount function, can be with
Ammonia spraying amount is manually reduced, while observes the change of SCR reactor outlets NOx, to analyze pyrolysis oven internal crystallization situation,
The effect that a small amount of crystalline solid pyrolysis occurs for talent is also functioned at the same time.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the method further include：
Switching disturbances are carried out to the air/ammonia gas mixture regulating valve in pyrolysis oven exit according to default frequency；
Pyrolysis oven internal crystallization is purged using variable air rate mode, pyrolysis oven internal crystallization is blown off.
In the embodiment of the present invention, pyrolysis oven internal crystallization can be purged using variable air rate mode, so that will pyrolysis
Furnace interior crystallization is blown off, specifically, air/ammonia gas mixture regulating valve progress to pyrolysis oven exit frequently disturb by switch
It is dynamic, meanwhile, pyrolysis oven internal crystallization is blown off using Wind Volume evolutionary mode, thus, it is possible to prevent the macrocrystalline body of knot from taking off
Fall to block pyrolysis outlet of still, cause SCR denitration system to be forced to shut down caused by off-the-line.
In the embodiment of the present invention, using rational firing optimization means, can on the premise of safe operation of the boiler is ensured,
SCR Reactor inlet NOx concentrations are reduced as far as possible, to reduce ammonia spraying amount.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the method further include：
According to the variation tendency of boiler load, the coal used using the method for coal mixing combustion boiler with mixing, obtain
The new coal used for the boiler, avoids actual burning coal off-design value excessive, causes ammonia spraying amount increase excessive.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the variation tendency according to boiler load, the coal used using the method for coal mixing combustion boiler carry out with mix including：
Obtain the operating parameter and performance parameter of boiler；
According to the operating parameter and performance parameter of the boiler got, and combine coal blending boundary condition and the same day all kinds of coals
Quantity in stock, determines that matching somebody with somebody for all kinds of coals is mixed than row and dosage；
Wherein, the coal blending boundary condition includes：It is single with coal restrictive condition and border mark.
In the embodiment for the prevention method that foregoing SCR denitration system pyrolysis oven internal crystallization comes off, further
Ground, the operating parameter include：The tube wall temperature of boiler, combustion chamber draft, the temperature and pressure of main steam, the temperature of reheated steam
With pressure, coal pulverizer outlet wind-warm syndrome in one or more of；
The performance parameter of the boiler includes：The current operational efficiency of boiler, power generation standard coal consumption and supply standard coal consumption
One or more of.
In the embodiment of the present invention, it can also be constructed again to pyrolysis oven external thermal insulation, for the insulation of pyrolysis oven lower part
Bad problem, the rectification re-started so that pyrolysis oven external thermal insulation is functional, so as to improve the solution thermal energy of pyrolysis oven
Power, avoids pyrolysis oven internal crystallization from coming off, blocks pyrolysis outlet of still.
The prevention method that SCR denitration system pyrolysis oven internal crystallization provided in an embodiment of the present invention is come off is in the power plant
Tried out in the 3 stove SCR denitration systems of phase No. 5, in the trial employment period, the SCR denitration system normal operation, does not occur heat again
Solution furnace interior crystallization, which comes off, to be caused to be pyrolyzed the abnormal scene that outlet of still is blocked, and the fact illustrates, and provided in an embodiment of the present invention one
Serial precautionary measures are effective, slow down the formation of pyrolysis oven crystallization, from now on, can also stop standby opportunity using unit, to de-
Crystalline condition inside nitre pyrolysis oven is checked comprehensively, and existing crystalline solid is thoroughly handled.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (3)
- A kind of 1. prevention method that SCR denitration system pyrolysis oven internal crystallization comes off, it is characterised in that including：By the switch-mode regulation of the pyrolysis wind inlet regulating valve of pyrolysis oven to opening state；Temperature and pyrolysis oven internal temperature to pyrolysis oven exit are measured in real time, if the temperature in pyrolysis oven exit is less than First preset temperature, then improve the temperature in pyrolysis oven exit to the first preset temperature；If pyrolysis oven internal temperature is less than the Two preset temperatures, then improve pyrolysis oven internal temperature to the second preset temperature；Wherein, the method further includes：Air/ammonia gas mixture the regulating valve for adjusting pyrolysis outlet of still causes all air/ammonia gas mixture regulating valve to be in Opening state；Wherein, the method further includes：When the NOx concentration of SCR reactor outlets is less than or equal to preset standard value, closing the automatic of urea spray gun reduces ammonia spraying amount Function；Wherein, the method further includes：Switching disturbances are carried out to the air/ammonia gas mixture regulating valve in pyrolysis oven exit according to default frequency；Pyrolysis oven internal crystallization is purged using variable air rate mode, pyrolysis oven internal crystallization is blown off；Wherein, the method further includes：According to the variation tendency of boiler load, the coal used using the method for coal mixing combustion boiler with mixing, obtain for being somebody's turn to do The new coal that boiler uses；Wherein, the variation tendency according to boiler load, the coal used using the method for coal mixing combustion boiler, which match somebody with somebody, to be mixed Including：Obtain the operating parameter and performance parameter of boiler；According to the operating parameter and performance parameter of the boiler got, and combine the stock of coal blending boundary condition and the same day all kinds of coals Amount, determines that matching somebody with somebody for all kinds of coals is mixed than row and dosage；Wherein, the coal blending boundary condition includes：It is single with coal restrictive condition and border mark；Wherein, the operating parameter includes：The tube wall temperature of boiler, combustion chamber draft, the temperature and pressure of main steam, reheated steam Temperature and pressure, coal pulverizer outlet one or more of wind-warm syndrome；The performance parameter of the boiler includes：In the current operational efficiency of boiler, power generation standard coal consumption and supply standard coal consumption It is one or more；Wherein, pyrolysis oven internal temperature is controlled to be more than or equal to 420 DEG C, while it is 380 DEG C to control the temperature in pyrolysis oven exit.
- 2. the prevention method that SCR denitration system pyrolysis oven internal crystallization according to claim 1 comes off, it is characterised in that The temperature to pyrolysis oven exit, which carries out measurement in real time, to be included：Temperature measuring point is set on the outer wall in pyrolysis oven exit, the temperature in pyrolysis oven exit is carried out by the temperature measuring point real When measure.
- 3. the prevention method that SCR denitration system pyrolysis oven internal crystallization according to claim 2 comes off, it is characterised in that The method further includes：If the measurement temperature of the temperature measuring point is less than the first preset temperature, starts warning device and issue warning signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610134808.8A CN105771644B (en) | 2016-03-09 | 2016-03-09 | The prevention method that a kind of SCR denitration system pyrolysis oven internal crystallization comes off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610134808.8A CN105771644B (en) | 2016-03-09 | 2016-03-09 | The prevention method that a kind of SCR denitration system pyrolysis oven internal crystallization comes off |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105771644A CN105771644A (en) | 2016-07-20 |
| CN105771644B true CN105771644B (en) | 2018-04-17 |
Family
ID=56387957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610134808.8A Active CN105771644B (en) | 2016-03-09 | 2016-03-09 | The prevention method that a kind of SCR denitration system pyrolysis oven internal crystallization comes off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105771644B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108019758B (en) * | 2017-12-08 | 2023-09-19 | 大唐洛阳热电有限责任公司 | Modification method of pyrolysis furnace used in pyrolysis denitration process |
| CN113294801B (en) * | 2021-05-26 | 2022-05-27 | 华中科技大学 | Combustion device capable of realizing high-efficiency clean combustion of pure ammonia and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007000782A (en) * | 2005-06-24 | 2007-01-11 | Samson Co Ltd | Denitrification apparatus for automatically getting rid of clogging of urea water jetting nozzle |
| CN103446882A (en) * | 2013-09-05 | 2013-12-18 | 中国大唐集团环境技术有限公司 | Crystal cleaning device for pyrolysis chamber of selective catalytic reduction (SCR) urea denitration equipment |
| CN104897291A (en) * | 2015-03-30 | 2015-09-09 | 北京京能电力股份有限公司石景山热电厂 | Urea pyrolyzing furnace deposit monitoring method and system |
-
2016
- 2016-03-09 CN CN201610134808.8A patent/CN105771644B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007000782A (en) * | 2005-06-24 | 2007-01-11 | Samson Co Ltd | Denitrification apparatus for automatically getting rid of clogging of urea water jetting nozzle |
| CN103446882A (en) * | 2013-09-05 | 2013-12-18 | 中国大唐集团环境技术有限公司 | Crystal cleaning device for pyrolysis chamber of selective catalytic reduction (SCR) urea denitration equipment |
| CN104897291A (en) * | 2015-03-30 | 2015-09-09 | 北京京能电力股份有限公司石景山热电厂 | Urea pyrolyzing furnace deposit monitoring method and system |
Non-Patent Citations (3)
| Title |
|---|
| SCR尿素热解系统尿素结晶的预防与对策;裴庆春;《中国环保产业》;20120420(第4期);第49-52页 * |
| 脱硝尿素热解系统沉积物形成原因分析及对策;刘成武;《热力发电》;20130325;第42卷(第3期);论文第53页，第57页 7 解决措施 * |
| 脱硝系统热解炉内结晶原因分析与预防措施;李海浩;《华电技术》;20150625;第37卷(第6期);论文第7页图1和第8页3 结晶原因分析，4预防措施 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105771644A (en) | 2016-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021184786A1 (en) | Urea direct-injection pyrolysis denitrification device arranged inside outlet flue duct of gas turbine | |
| CN207635328U (en) | A kind of low nitrogen combustion apparatus for flue gas recirculation | |
| CN102179171B (en) | Multi-stage themolysis coupled denitration method using front flow field uniformizing device and device thereof | |
| CN109084324B (en) | The burning air quantity control system and control method of biomass boiler | |
| JPS6157927B2 (en) | ||
| CN205235766U (en) | Automatic control SCR flue gas denitration urea pyrolysis system | |
| CN105498532A (en) | Automatic control SCR flue gas denitrification urea pyrolysis system | |
| CN207378806U (en) | A kind of coal-fired boiler combustion runtime | |
| CN110141961A (en) | A kind of coal-burning boiler full load SCR denitration system | |
| CN208436636U (en) | Boiler smoke temperature adjustment structure and the boiler flue gas denitration system for applying it | |
| CN105771644B (en) | The prevention method that a kind of SCR denitration system pyrolysis oven internal crystallization comes off | |
| CN108105794A (en) | A kind of SCR denitration system inlet flue gas temperature adaptive regulation method | |
| CN208097812U (en) | A kind of equipment for denitrifying flue gas | |
| CN207025089U (en) | A kind of ammonia system processed that urea pyrolysis is directly realized using high temperature flue-gas from boiler | |
| CN106310933A (en) | Flue gas denitration system for coal water slurry boiler and method for denitrating flue gas | |
| CN211098341U (en) | SCR flue gas denitration device of garbage incinerator | |
| CN209476010U (en) | A kind of urea denitrating system based on Combined cycle gas-steam turbine unit | |
| CN208382176U (en) | A kind of flue gas recirculation system | |
| CN103398397A (en) | Combustion system of boiler and combustion method implemented by aid of system | |
| CN212318166U (en) | Energy-saving combustion engine NOx emission reduction system | |
| CN104906950A (en) | Low-temperature SCR flue gas denitration equipment | |
| CN212142070U (en) | Ammonia gas uniform distributor for SNCR denitration process | |
| CN202087235U (en) | Multi-level thermolysis coupling denitrification device with pre-flow field equalizing device | |
| CN104897291A (en) | Urea pyrolyzing furnace deposit monitoring method and system | |
| CN211925809U (en) | System for satisfying coal-fired thermal power generating unit full load denitration catalyst operating temperature demand |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 232008 Luohe Power Plant, Luohe Town, Datong District, Huainan City, Anhui Province Patentee after: Datang Anhui Power Generation Co.,Ltd. Huainan Luohe Power Generation Branch Address before: 232008 Luohe Power Plant, Luohe Town, Datong District, Huainan City, Anhui Province Patentee before: DATANG HUAINAN LUOHE POWER PLANT |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230727 Address after: 232008 100 meters east of Luohe Police Station, Luohe Town, Datong District, Huainan City, Anhui Province Patentee after: Huainan Luohe Power Generation Co.,Ltd. Address before: 232008 Luohe Power Plant, Luohe Town, Datong District, Huainan City, Anhui Province Patentee before: Datang Anhui Power Generation Co.,Ltd. Huainan Luohe Power Generation Branch |
|
| TR01 | Transfer of patent right |