CN110801728A - SNCR denitration reaction tower device and system - Google Patents
SNCR denitration reaction tower device and system Download PDFInfo
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- CN110801728A CN110801728A CN201910992973.0A CN201910992973A CN110801728A CN 110801728 A CN110801728 A CN 110801728A CN 201910992973 A CN201910992973 A CN 201910992973A CN 110801728 A CN110801728 A CN 110801728A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 40
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 51
- 239000007921 spray Substances 0.000 claims abstract description 43
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 112
- 239000004202 carbamide Substances 0.000 claims description 112
- 239000000243 solution Substances 0.000 claims description 42
- 238000003860 storage Methods 0.000 claims description 40
- 238000002347 injection Methods 0.000 claims description 35
- 239000007924 injection Substances 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 18
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 26
- 239000003546 flue gas Substances 0.000 abstract description 26
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 13
- 239000000428 dust Substances 0.000 abstract description 4
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 3
- 239000002920 hazardous waste Substances 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- B01D53/77—Liquid phase processes
- B01D53/79—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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses an SNCR (selective non-catalytic reduction) denitration reaction tower device and system, and belongs to the technical field of hazardous waste treatment equipment. The SNCR denitration reaction tower device and the system comprise a hearth, wherein a plurality of baffle plates are fixedly connected in the hearth, a spray head is arranged between every two adjacent baffle plates, the spray head is fixedly connected to the side wall of the hearth, one end of the spray head is fixedly connected with an annular pipe, and the spray head is fixedly connected with a reducing agent inlet pipe through the annular pipe; still include the motor, motor fixed connection is on furnace, the output fixedly connected with of motor connects the pivot, connect the pivot and run through the baffle, fixedly connected with rotor plate between two continuous baffles, rotor plate fixed connection is in connecting the pivot, the baffle below is equipped with the filter, the filter links to each other with furnace is fixed, and the device prevents that the dust in the flue gas from blockking up the shower nozzle, can further improve the effect and the speed of denitration simultaneously, reduces nitrogen oxide's discharge amount.
Description
Technical Field
The invention relates to the technical field of hazardous waste treatment equipment, in particular to an SNCR (selective non-catalytic reduction) denitration reaction tower device and system.
Background
Denitration refers to a process of removing nitrogen oxides from combustion flue gas, and the importance of preventing environmental pollution is pointed out as a problem worldwide, and the mainstream processes in the world are classified into SCR and SNCR. These two processes are not very different except that the reaction temperature is lower than SNCR due to the use of catalyst for SCR, but the SCR investment is at least several times, even more than 10 times, the SNCR investment if both from the point of view of construction costs and operating costs.
The selective non-catalytic reduction SNCR device and system is a flue gas denitration technology after combustion, and is a chemical reaction process for removing NOX by spraying a proper amount of reducing agent at a proper position of a thermal power generation boiler, a garbage combustion furnace, a cement kiln or other industrial boilers.
Through retrieval, the patent application number is 201620857182.9, the granted publication number is CN205867981U, the patent name is the invention patent of SNCR denitrification facility, disclose an SNCR denitrification facility, its technical scheme main points are including furnace and reducing agent bin, the furnace includes SNCR injection zone and combustion area located below above, the spray gun of being connected with reducing agent bin is installed to SNCR injection zone, be connected with the heat exchange core body between reducing agent bin and the spray gun, the furnace top is connected with the drainage tube that guides flue gas after the denitration to pass the heat exchange core body and carry out the heat exchange with the reducing agent, environmental protection and energy saving's effect has been reached.
The SNCR denitration device disclosed by the invention can well use the waste heat in the hearth for heating the reducing agent, has good environment-friendly and energy-saving effects, but when the reducing agent is used for removing the nitrogen oxides in the smoke, the treatment effect is poor, partial nitrogen oxides can be discharged to pollute the air, and the dust in the smoke can be attached to the inner wall of the furnace or a spray head to block the spray head, so that the denitration effect is influenced.
Disclosure of Invention
The present invention is directed to solving the problems of the background art described above, and an object of the present invention is to provide an SNCR denitration reactor apparatus and system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the SNCR denitration reaction tower device and the system comprise a hearth, wherein a plurality of baffle plates are fixedly connected in the hearth, a spray head is arranged between every two adjacent baffle plates, the spray head is fixedly connected to the side wall of the hearth, one end of the spray head is fixedly connected with an annular pipe, and the spray head is fixedly connected with a reducing agent inlet pipe through the annular pipe;
still include the motor, motor fixed connection is on furnace, the output fixedly connected with of motor connects the pivot, connect the pivot and run through the baffle, fixedly connected with rotor plate between two continuous baffles, rotor plate fixed connection is in connecting the pivot, the baffle below is equipped with the filter, the filter links to each other with furnace is fixed.
Preferably, the number of the baffles is 4 to 6.
Preferably, the hearth is fixedly connected with an air outlet pipe.
Preferably, an automatic regulating valve is arranged on the reducing agent inlet pipe.
Preferably, the connecting shaft is fixedly connected with a connecting plate at one end far away from the motor, the connecting shaft is connected with a scraper blade through the connecting plate, the scraper blade is positioned at the lower end of the filter plate, and the scraper blade is attached to the side wall of the hearth.
Preferably, the hearth is fixedly connected with a support column, and the hearth is fixedly connected with the motor through the support column.
Preferably, the number of the scrapers is 2 to 4.
Preferably, the number of the spray heads between two adjacent baffles is 5 to 15.
The SNCR denitration reaction tower system comprises the following steps:
s1, urea storage: selecting solid urea as a reducing agent, conveying the solid urea to a reaction equipment site, and storing the solid urea in a urea storage bin which is dry and well ventilated and has the temperature and the humidity of 20 ℃;
s2, preparation of urea solution:
a. the storage tank is basically set as follows: setting the adding amount of urea to be 300kg, the adding amount of clean water to be 2700kg, the temperature control target of the blending tank to be 50 ℃, the low temperature control target of the storage tank to be 40 ℃, the low liquid level alarm of the storage tank to be 500kg, and the low liquid level of the storage tank not to be heated to be 500 kg;
b. and (3) blending and starting: pressing a urea blending button, adding 2600kg of clean water into a blending tank, introducing steam, controlling the temperature to be 40 ℃, adding 300kg of urea after the completion of adding, starting a stirrer to stir the mixed solution of the clean water and the urea, stopping adding the steam when the water temperature is 50 ℃, and stopping the operation of the stirrer to obtain the 11% urea solution.
S3, conveying the urea solution:
c. and starting the urea delivery pump, delivering the urea solution into the urea storage tank, stopping the delivery after the delivery is finished, and completely extinguishing the start button.
The prepared urea solution with the urea concentration of 10% is taken, the urea solution with the urea concentration of 10% in the pump is conveyed into a reducing agent inlet pipe (3) through a urea solution conveying pump, the conveying pump adopts a centrifugal pump, and a filter screen is arranged at an inlet from a reducing agent storage tank to the centrifugal pump;
s4, urea solution injection: and urea solution with the urea concentration of 11% is sprayed into the hearth through the reducing agent inlet pipe and the spray head to perform reaction and denitration.
Preferably, the denitration system flow in step S4 mainly includes:
①, accessing each device in the hearth into a CEMS signal, wherein the detection range of the CEMS is 0-20ppm, when the detection concentration of the CEMS is more than 40ppm, starting a urea spray column pump, when the temperature is more than 300 ℃, starting a protection fan to cool the hearth, and when the temperature of the secondary furnace is less than 300 ℃, stopping the protection fan;
②, when a De-NOx automatic control cycle is carried out for 6-50L/min, the injection starting concentration is more than 40ppm, the injection control concentration is less than 30ppm, then an NOx bottom control cycle is carried out for 0-6L/min, the NOx concentration is less than 30ppm, the lowest injection amount is maintained at 6L/min, and when the time of 0 concentration reaches 5min, the system is shut down;
③, setting the injection opening to be 0-100% when a De-NOx manual control cycle is carried out for 6-50L/min, then carrying out a NOx bottom control cycle for 0-6L/min, and stopping injection when the time when the injection opening is 0% reaches 5 min;
④, starting cleaning the gun, wherein the time for cleaning the gun is 30s, and after the cleaning is finished, if the concentration of NOx is more than 40ppm without the system shutdown, repeating the step ② or ③.
Compared with the prior art, the invention provides an SNCR denitration reaction tower device and system, which have the following beneficial effects:
the SNCR denitration reaction tower device and the system thereof are characterized in that solid urea serving as a reducing agent is selected at first, the solid urea is conveyed to a reaction equipment site, and the solid urea is placed in a urea storage bin which is dry and well ventilated and has the temperature and humidity of 20 ℃ for storage;
the storage tank is basically set as follows: setting the adding amount of urea to be 300kg, the adding amount of clean water to be 2700kg, the temperature control target of the blending tank to be 50 ℃, the low temperature control target of the storage tank to be 40 ℃, the low liquid level alarm of the storage tank to be 500kg, and the low liquid level of the storage tank not to be heated to be 500 kg;
pressing a urea blending button, adding 2600kg of clean water into a blending tank, introducing steam, controlling the temperature to be 40 ℃, adding 300kg of urea after the completion of adding, starting a stirrer to stir the mixed solution of the clean water and the urea, stopping adding the steam when the water temperature is 50 ℃, and stopping the operation of the stirrer to obtain the 11% urea solution.
And (4) conveying the urea solution into a urea storage tank, stopping conveying after the conveying is finished, and completely extinguishing the starting button.
Taking the prepared urea solution with the urea concentration of 10%, and conveying the urea solution with the urea concentration of 10% in a pump machine to a reducing agent inlet pipe 3 through a urea solution conveying pump, wherein the conveying pump adopts a centrifugal pump, and a filter screen is arranged at an inlet from a reducing agent storage tank to the centrifugal pump;
the urea solution with the urea concentration of 11% is sprayed into the hearth 1 through the reducing agent inlet pipe 3 and the spray head 301 to perform reaction and denitration.
Each device in the hearth 1 is connected with a CEMS signal, the detection range of the CEMS is 0-20ppm, when the detection concentration of the CEMS is more than 40ppm, a urea spray column pump is started, when the temperature is more than 300 ℃, a protection fan is started to cool the hearth, and when the temperature of a secondary furnace is less than 300 ℃, the protection fan is stopped;
when a De-NOx automatic control cycle is carried out for 6-50L/min, the injection starting concentration is greater than 40ppm, the injection control concentration is less than 30ppm, then an NOx bottom control cycle is carried out for 0-6L/min, the NOx concentration is less than 30ppm, the lowest injection amount is maintained at 6L/min, and when the time of 0 concentration reaches 5min, the system is shut down;
when a De-NOx manual control cycle is carried out for 6-50L/min, the injection opening is set to be 0-100%, then an NOx bottom control cycle is carried out for 0-6L/min, and when the injection opening is 0% and the time reaches 5min, the injection is stopped;
starting cleaning the gun, wherein the gun cleaning time is 30s, and after cleaning is finished, if the system is not stopped and the concentration of NOx is more than 40ppm, repeating the step De-NOx automatic control cycle or the step De-NOx manual control cycle;
when reaction denitration is carried out, smoke generated by reaction in the hearth can move upwards, and the smoke is filtered by the filter plate when moving upwards, so that large-particle substances can be prevented from moving upwards to block the spray head;
when the motor rotates, the motor is fixedly connected to the hearth through the support columns and can drive the connecting plate at the bottom end to rotate so as to drive the 3 scraping plates to rotate, and the scraping plates can scrape large granular substances attached to the side wall of the hearth when rotating;
the flue gas in the hearth can move upwards along a bow-shaped path formed by the 4 baffles and is discharged through the gas outlet pipe and the heat exchange core body;
when the flue gas moves upwards along with the path of the baffle plates, the reducing agent passing through the heat exchange core body is sprayed into the hearth through the reducing agent inlet pipe, the annular pipe and the spray heads, the number of the spray heads between the two connected baffle plates is 10, and the denitration effect is better;
between the two connected baffle plates, the reducing agent sprayed by the spray head on one side with the same moving direction of the flue gas accelerates the moving speed of the flue gas while denitrating the flue gas, the reducing agent sprayed by the spray head on the side opposite to the moving direction of the flue gas slows down the moving speed of the flue gas, and the reaction speed is higher, the reaction is more sufficient and the denitration effect is better due to the fact that the sprayed reducing agent is opposite to the moving direction of the flue gas;
when the motor rotates, the rotating plate is driven to rotate through the connecting rotating shaft, so that the reducing agent between two adjacent baffles is fully mixed with the flue gas, the reaction efficiency is improved, and the denitration effect is better;
the amount of the sprayed reducing agent can be automatically controlled according to the concentration and the flow rate of the flue gas through the automatic regulating valve, so that the reducing agent is fully utilized;
the device prevents that the dust in the flue gas from blockking up the shower nozzle, can further improve the effect and the speed of denitration simultaneously, reduces nitrogen oxide's discharge amount.
Drawings
Fig. 1 is a schematic structural diagram of an SNCR denitration reactor and system according to the present invention;
FIG. 2 is a schematic cross-sectional view of an SNCR denitration reactor and a system according to the present invention;
FIG. 3 is a schematic cross-sectional view of an SNCR denitration reactor and a system according to the present invention;
FIG. 4 is a system flow diagram of an SNCR denitration reactor apparatus and system according to the present invention;
FIG. 5 is a flow chart of a denitration system of the SNCR denitration reaction tower device and system according to the present invention;
FIG. 6 is a flow chart of a denitration system of the SNCR denitration reaction tower device and system according to the present invention;
fig. 7 is a system flow chart of urea solution preparation of the SNCR denitration reaction tower apparatus and system according to the present invention.
In the figure: 1. a hearth; 101. a motor; 1011. a support pillar; 102. an air outlet pipe; 103. a filter plate; 2. connecting the rotating shaft; 201. a rotating plate; 202. a connecting plate; 2021. a squeegee; 3. a reducing agent inlet pipe; 301. a spray head; 3011. an annular tube; 302. an automatic regulating valve; 4. and a baffle plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings 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 of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
referring to fig. 1-3, the SNCR denitration reaction tower device includes a furnace 1, a plurality of baffles 4 are fixedly connected in the furnace 1, a spray nozzle 301 is arranged between two adjacent baffles 4, the spray nozzle 301 is fixedly connected to the side wall of the furnace 1, one end of the spray nozzle 301 is fixedly connected with a ring pipe 3011, and the spray nozzle 301 is fixedly connected with a reducing agent inlet pipe 3 through the ring pipe 3011;
still include motor 101, motor 101 fixed connection is on furnace 1, and motor 101's output fixedly connected with connects pivot 2, connects pivot 2 and runs through baffle 4, fixedly connected with rotor plate 201 between two continuous baffles 4, and rotor plate 201 fixed connection is on connecting pivot 2, and baffle 4 below is equipped with filter 103, and filter 103 is fixed continuous with furnace 1.
The number of the baffle plates 4 is 4 to 6.
An outlet pipe 102 is fixedly connected to the hearth 1.
The reducing agent intake pipe 3 is provided with an automatic regulating valve 302.
The one end fixedly connected with connecting plate 202 that connects pivot 2 and keep away from motor 101 connects the pivot 2 through connecting plate 202 and is connected with scraper 2021, and scraper 2021 is located the lower extreme of filter 103, and scraper 2021 pastes mutually with the lateral wall of furnace 1.
Fixedly connected with support column 1011 on furnace 1, furnace 1 passes through support column 1011 and motor 101 fixed connection.
The number of the scrapers 2021 is 2 to 4.
The number of the heads 301 between the two continuous baffle plates 4 is 5 to 15.
The SNCR denitration reaction tower system comprises the following steps:
s1, urea storage: selecting solid urea as a reducing agent, conveying the solid urea to a reaction equipment site, and storing the solid urea in a urea storage bin which is dry and well ventilated and has the temperature and the humidity of 20 ℃;
s2, preparation of urea solution:
a. the storage tank is basically set as follows: setting the adding amount of urea to be 300kg, the adding amount of clean water to be 2700kg, the temperature control target of the blending tank to be 50 ℃, the low temperature control target of the storage tank to be 40 ℃, the low liquid level alarm of the storage tank to be 500kg, and the low liquid level of the storage tank not to be heated to be 500 kg;
b. and (3) blending and starting: pressing a urea blending button, adding 2600kg of clean water into a blending tank, introducing steam, controlling the temperature to be 40 ℃, adding 300kg of urea after the completion of adding, starting a stirrer to stir the mixed solution of the clean water and the urea, stopping adding the steam when the water temperature is 50 ℃, and stopping the operation of the stirrer to obtain the 11% urea solution.
S3, conveying the urea solution:
c. and starting the urea delivery pump, delivering the urea solution into the urea storage tank, stopping the delivery after the delivery is finished, and completely extinguishing the start button.
Taking the prepared urea solution with the urea concentration of 10%, and conveying the urea solution with the urea concentration of 10% in a pump machine to a reducing agent inlet pipe 3 through a urea solution conveying pump, wherein the conveying pump adopts a centrifugal pump, and a filter screen is arranged at an inlet from a reducing agent storage tank to the centrifugal pump;
s4, urea solution injection: the urea solution with the urea concentration of 11% is sprayed into the hearth 1 through the reducing agent inlet pipe 3 and the spray head 301 to perform reaction and denitration.
The denitration system flow in step S4 mainly includes:
①, accessing each device in the hearth 1 to a CEMS signal, wherein the detection range of the CEMS is 0-20ppm, when the detection concentration of the CEMS is more than 40ppm, starting a urea spray column pump, when the temperature is more than 300 ℃, starting a protection fan to cool the hearth, and when the temperature of the secondary furnace is less than 300 ℃, stopping the protection fan;
②, when a De-NOx automatic control cycle is carried out for 6-50L/min, the injection starting concentration is more than 40ppm, the injection control concentration is less than 30ppm, then an NOx bottom control cycle is carried out for 0-6L/min, the NOx concentration is less than 30ppm, the lowest injection amount is maintained at 6L/min, and when the time of 0 concentration reaches 5min, the system is shut down;
③, setting the injection opening to be 0-100% when a De-NOx manual control cycle is carried out for 6-50L/min, then carrying out a NOx bottom control cycle for 0-6L/min, and stopping injection when the time when the injection opening is 0% reaches 5 min;
④, starting cleaning the gun, wherein the time for cleaning the gun is 30s, and after the cleaning is finished, if the concentration of NOx is more than 40ppm without the system shutdown, repeating the step ② or ③.
When the urea storage bin is used by a user, firstly, solid urea serving as a reducing agent is selected, the solid urea is conveyed to a reaction equipment site, and the solid urea is stored in a urea storage bin which is dry, well ventilated and has the temperature and humidity of 20 ℃;
the storage tank is basically set as follows: setting the adding amount of urea to be 300kg, the adding amount of clean water to be 2700kg, the temperature control target of the blending tank to be 50 ℃, the low temperature control target of the storage tank to be 40 ℃, the low liquid level alarm of the storage tank to be 500kg, and the low liquid level of the storage tank not to be heated to be 500 kg;
pressing a urea blending button, adding 2600kg of clean water into a blending tank, introducing steam, controlling the temperature to be 40 ℃, adding 300kg of urea after the completion of adding, starting a stirrer to stir the mixed solution of the clean water and the urea, stopping adding the steam when the water temperature is 50 ℃, and stopping the operation of the stirrer to obtain the 11% urea solution.
And (4) conveying the urea solution into a urea storage tank, stopping conveying after the conveying is finished, and completely extinguishing the starting button.
Taking the prepared urea solution with the urea concentration of 10%, and conveying the urea solution with the urea concentration of 10% in a pump machine to a reducing agent inlet pipe 3 through a urea solution conveying pump, wherein the conveying pump adopts a centrifugal pump, and a filter screen is arranged at an inlet from a reducing agent storage tank to the centrifugal pump;
the urea solution with the urea concentration of 11% is sprayed into the hearth 1 through the reducing agent inlet pipe 3 and the spray head 301 to perform reaction and denitration.
Each device in the hearth 1 is connected with a CEMS signal, the detection range of the CEMS is 0-20ppm, when the detection concentration of the CEMS is more than 40ppm, a urea spray column pump is started, when the temperature is more than 300 ℃, a protection fan is started to cool the hearth, and when the temperature of a secondary furnace is less than 300 ℃, the protection fan is stopped;
when a De-NOx automatic control cycle is carried out for 6-50L/min, the injection starting concentration is greater than 40ppm, the injection control concentration is less than 30ppm, then an NOx bottom control cycle is carried out for 0-6L/min, the NOx concentration is less than 30ppm, the lowest injection amount is maintained at 6L/min, and when the time of 0 concentration reaches 5min, the system is shut down;
when a De-NOx manual control cycle is carried out for 6-50L/min, the injection opening is set to be 0-100%, then an NOx bottom control cycle is carried out for 0-6L/min, and when the injection opening is 0% and the time reaches 5min, the injection is stopped;
starting cleaning the gun, wherein the gun cleaning time is 30s, and after cleaning is finished, if the system is not stopped and the concentration of NOx is more than 40ppm, repeating the step De-NOx automatic control cycle or the step De-NOx manual control cycle;
when reaction denitration is carried out, smoke generated by reaction in the hearth 1 can move upwards, and the smoke is filtered by the filter plate 103 when moving upwards, so that large-particle substances can be prevented from moving upwards to block the spray head 301;
when the motor 101 rotates, the motor 101 is fixedly connected to the hearth 1 through the support column 1011, and can drive the connection plate 202 at the bottom end to rotate, so as to drive the 3 scraping plates 2021 to rotate, and the scraping plates 2021 can scrape large granular substances attached to the side wall of the hearth 1 when rotating;
the flue gas in the hearth 1 can move upwards along a zigzag path formed by the 4 baffles 4 and is discharged through the gas outlet pipe 102 and the heat exchange core body;
when the flue gas moves upwards along with the paths of the baffles 4, the reducing agent passing through the heat exchange core body is sprayed into the hearth 1 through the reducing agent inlet pipe 3, the annular pipe 3011 and the spray heads 301, and the number of the spray heads 301 between two connected baffles 4 is 10, so that the denitration effect is better;
between two connected baffle plates 4, the reducing agent sprayed by the spray nozzle 301 on one side with the same moving direction of the flue gas can accelerate the moving speed of the flue gas while denitrating the flue gas, the reducing agent sprayed by the spray nozzle 301 on the side opposite to the moving direction of the flue gas can slow down the moving speed of the flue gas, and the reaction speed is higher due to the fact that the sprayed reducing agent is opposite to the moving direction of the flue gas, the reaction is more sufficient, the denitration effect is better, and the escape rate of ammonia is less than 8 ppm;
when the motor 101 rotates, the rotating plate 201 is driven to rotate through the connecting rotating shaft 2, so that the reducing agent between two adjacent baffles 4 is fully mixed with the flue gas, the reaction efficiency is improved, and the denitration effect is better;
the amount of the sprayed reducing agent can be automatically controlled according to the concentration and the flow rate of the flue gas through the automatic regulating valve 302, so that the reducing agent is fully utilized;
the device prevents that the dust in the flue gas from blockking up shower nozzle 301, can further improve the effect and the speed of denitration simultaneously, reduces nitrogen oxide's discharge amount.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
- The SNCR denitration reaction tower device comprises a hearth (1) and is characterized in that a plurality of baffle plates (4) are fixedly connected in the hearth (1), a spray head (301) is arranged between every two adjacent baffle plates (4), the spray head (301) is fixedly connected to the side wall of the hearth (1), one end of the spray head (301) is fixedly connected with a ring-shaped pipe (3011), and the spray head (301) is fixedly connected with a reducing agent inlet pipe (3) through the ring-shaped pipe (3011);still include motor (101), motor (101) fixed connection is on furnace (1), the output fixedly connected with of motor (101) connects pivot (2), connect pivot (2) and run through baffle (4), fixedly connected with rotor plate (201) between two continuous baffles (4), rotor plate (201) fixed connection is on connecting pivot (2), baffle (4) below is equipped with filter (103), filter (103) are fixed continuous with furnace (1).
- 2. The SNCR denitration reactor apparatus according to claim 1, wherein the number of the baffle plates (4) is 4 to 6.
- 3. The SNCR denitration reaction tower apparatus according to claim 1, wherein an outlet pipe (102) is fixedly connected to the hearth (1).
- 4. The SNCR denitration reactor apparatus according to claim 2, wherein an automatic regulating valve (302) is provided on the reducing agent inlet pipe (3).
- 5. The SNCR denitration reaction tower device according to claim 1, wherein one end of the connection rotating shaft (2) far away from the motor (101) is fixedly connected with a connecting plate (202), the connection rotating shaft (2) is connected with a scraper (2021) through the connecting plate (202), the scraper (2021) is positioned at the lower end of the filter plate (103), and the scraper (2021) is attached to the side wall of the hearth (1).
- 6. The SNCR denitration reaction tower device according to claim 1, wherein a support column (1011) is fixedly connected to the furnace chamber (1), and the furnace chamber (1) is fixedly connected with the motor (101) through the support column (1011).
- 7. The SNCR denitration reactor apparatus according to claim 5, wherein the number of the scrapers (2021) is 2 to 4.
- 8. The SNCR denitration reactor apparatus according to claim 1, wherein the number of the spray heads (301) between the two baffle plates (4) connected is 5 to 15.
- An SNCR denitration reaction tower system using the SNCR denitration reaction tower of claims 1 to 8, comprising the steps of:s1, urea storage: selecting solid urea as a reducing agent, conveying the solid urea to a reaction equipment site, and storing the solid urea in a urea storage bin which is dry and well ventilated and has the temperature and the humidity of 20 ℃;s2, preparation of urea solution:a. the storage tank is basically set as follows: setting the adding amount of urea to be 300kg, the adding amount of clean water to be 2700kg, the temperature control target of the blending tank to be 50 ℃, the low temperature control target of the storage tank to be 40 ℃, the low liquid level alarm of the storage tank to be 500kg, and the low liquid level of the storage tank not to be heated to be 500 kg;b. and (3) blending and starting: pressing a urea blending button, adding 2600kg of clean water into a blending tank, introducing steam, controlling the temperature to be 40 ℃, adding 300kg of urea after the completion of adding, starting a stirrer to stir the mixed solution of the clean water and the urea, stopping adding the steam when the water temperature is 50 ℃, and stopping the stirrer to operate to obtain 11% urea solution;s3, conveying the urea solution:c. starting a urea delivery pump, delivering the urea solution into a urea storage tank, stopping delivery after delivery is finished, and completely extinguishing a start button;the prepared urea solution with the urea concentration of 10% is taken, the urea solution with the urea concentration of 10% in the pump is conveyed into a reducing agent inlet pipe (3) through a urea solution conveying pump, the conveying pump adopts a centrifugal pump, and a filter screen is arranged at an inlet from a reducing agent storage tank to the centrifugal pump;s4, urea solution injection: the urea solution with the urea concentration of 11% is sprayed into the hearth (1) through the reducing agent inlet pipe (3) and the spray head (301) to carry out reaction and denitration.
- 10. The SNCR denitration reactor system according to claim 9, wherein the denitration system flow in step S4 mainly includes:①, accessing each device in the hearth (1) to a CEMS signal, wherein the detection range of the CEMS is 0-20ppm, when the detection concentration of the CEMS is more than 40ppm, starting a urea spray column pump, when the temperature is more than 300 ℃, starting a protection fan to cool the hearth, and when the temperature of the secondary furnace is less than 300 ℃, stopping the protection fan;②, when a De-NOx automatic control cycle is carried out for 6-50L/min, the injection starting concentration is more than 40ppm, the injection control concentration is less than 30ppm, then an NOx bottom control cycle is carried out for 0-6L/min, the NOx concentration is less than 30ppm, the lowest injection amount is maintained at 6L/min, and when the time of 0 concentration reaches 5min, the system is shut down;③, setting the injection opening to be 0-100% when a De-NOx manual control cycle is carried out for 6-50L/min, then carrying out a NOx bottom control cycle for 0-6L/min, and stopping injection when the time when the injection opening is 0% reaches 5 min;④, starting cleaning the gun, wherein the time for cleaning the gun is 30s, and after the cleaning is finished, if the concentration of NOx is more than 40ppm without the system shutdown, repeating the step ② or ③.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115228287A (en) * | 2022-07-12 | 2022-10-25 | 宁夏青铜峡水泥股份有限公司 | System and method for cooperatively removing nitrogen oxides in cement kiln tail flue gas dust |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205867981U (en) * | 2016-08-09 | 2017-01-11 | 北京翰海青天环保科技有限公司 | SNCR denitrification facility |
| CN207085662U (en) * | 2017-08-07 | 2018-03-13 | 嘉兴市九分钟生物科技有限公司 | A kind of environmental-protecting and high-efficient type waste-gas desulfurization deodorizing dust arrester |
| CN208465595U (en) * | 2018-06-13 | 2019-02-05 | 攀枝花市蓝鼎环保科技有限公司 | A kind of flue gas desulfurization special tower |
| CN109316923A (en) * | 2017-07-31 | 2019-02-12 | 沈阳天航环保科技有限公司 | High-efficiency multi-stage Spiralism type dynamic fluid flow film process flue gas device and processing method |
| KR20190027589A (en) * | 2017-09-07 | 2019-03-15 | 윤석준 | Exhaust gas purification apparatus |
| CN109794127A (en) * | 2018-12-30 | 2019-05-24 | 东莞市达威环保工程有限公司 | A kind of gravitational casting smelting furnace flue dust peculiar smell intelligent processing system |
| CN209060877U (en) * | 2018-10-29 | 2019-07-05 | 扬州市职业大学 | A kind of fume desulfurizing tower |
| CN209188447U (en) * | 2018-11-23 | 2019-08-02 | 新沂市泰松化工有限公司 | A kind of hydrogen chloride absorption tower with net depressed structure for pyridaben production |
| CN211725333U (en) * | 2019-10-18 | 2020-10-23 | 苏州巨鼎环保科技有限公司 | SNCR denitration reaction tower device and system |
-
2019
- 2019-10-18 CN CN201910992973.0A patent/CN110801728A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205867981U (en) * | 2016-08-09 | 2017-01-11 | 北京翰海青天环保科技有限公司 | SNCR denitrification facility |
| CN109316923A (en) * | 2017-07-31 | 2019-02-12 | 沈阳天航环保科技有限公司 | High-efficiency multi-stage Spiralism type dynamic fluid flow film process flue gas device and processing method |
| CN207085662U (en) * | 2017-08-07 | 2018-03-13 | 嘉兴市九分钟生物科技有限公司 | A kind of environmental-protecting and high-efficient type waste-gas desulfurization deodorizing dust arrester |
| KR20190027589A (en) * | 2017-09-07 | 2019-03-15 | 윤석준 | Exhaust gas purification apparatus |
| CN208465595U (en) * | 2018-06-13 | 2019-02-05 | 攀枝花市蓝鼎环保科技有限公司 | A kind of flue gas desulfurization special tower |
| CN209060877U (en) * | 2018-10-29 | 2019-07-05 | 扬州市职业大学 | A kind of fume desulfurizing tower |
| CN209188447U (en) * | 2018-11-23 | 2019-08-02 | 新沂市泰松化工有限公司 | A kind of hydrogen chloride absorption tower with net depressed structure for pyridaben production |
| CN109794127A (en) * | 2018-12-30 | 2019-05-24 | 东莞市达威环保工程有限公司 | A kind of gravitational casting smelting furnace flue dust peculiar smell intelligent processing system |
| CN211725333U (en) * | 2019-10-18 | 2020-10-23 | 苏州巨鼎环保科技有限公司 | SNCR denitration reaction tower device and system |
Non-Patent Citations (1)
| Title |
|---|
| 毛志伟，程群: "《氮氧化物减排》", 31 August 2014, 中国建材工业出版社, pages: 37 - 39 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115228287A (en) * | 2022-07-12 | 2022-10-25 | 宁夏青铜峡水泥股份有限公司 | System and method for cooperatively removing nitrogen oxides in cement kiln tail flue gas dust |
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