CN109200821B - A high-efficient soot blower for SCR denitration catalyst - Google Patents
A high-efficient soot blower for SCR denitration catalyst Download PDFInfo
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- CN109200821B CN109200821B CN201811376853.XA CN201811376853A CN109200821B CN 109200821 B CN109200821 B CN 109200821B CN 201811376853 A CN201811376853 A CN 201811376853A CN 109200821 B CN109200821 B CN 109200821B
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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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- 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
- B01D53/88—Handling or mounting catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
Abstract
The invention relates to a high-efficiency soot blower for an SCR (selective catalytic reduction) denitration catalyst, which comprises a blowing chamber and a dust removal chamber which are separated by a partition plate, wherein a placing platform is positioned in the blowing chamber, a blowing unit is arranged at the top of the blowing chamber, a negative pressure unit comprises an air suction channel, wherein an air inlet is upward and positioned below the placing platform, a screen plate is arranged at the air inlet, the air suction channel penetrates through the partition plate and is connected with the negative pressure unit, the blowing unit comprises a blowing pipe which is fixed at the top of the blowing chamber by virtue of a horizontal moving mechanism, a circular cavity is arranged at the tail end of the blowing pipe, a rotating frame is arranged in the circular cavity, sealing rolling balls matched with an air outlet of the circular; a funnel tube is arranged in the air suction channel, and the funnel tube forms an opening and closing unit of the air suction channel by means of the air pressure change of the purging chamber; the device adopts the pressure to change many times, positive negative pressure change, change many forms that suddenly change combine together and carry out the dust to the catalyst and get rid of, and the soot blowing effect is showing and is improving.
Description
Technical Field
The invention belongs to the technical field of catalyst cleaning and recovery, and particularly relates to a high-efficiency soot blower for an SCR (selective catalytic reduction) denitration catalyst.
Background
The SCR denitration process is the most effective method for realizing flue gas denitration in the current coal-fired boiler and is also a widely adopted process. The denitration catalyst of the key part of the process is inactivated after 24000 hours of operation, the denitration efficiency of a unit is reduced, the escape rate of ammonia is increased, and the smoke can not be discharged up to the standard. The principle of resource recycling and cost saving is adopted in thermal power plants, and the catalyst with good mechanical degree is regenerated by multiple choices so as to recover the activity of the catalyst. One of the main reasons for deactivation of the denitration catalyst is clogging of fly ash, so ash removal becomes the first step of regeneration of the denitration catalyst. The ash cleaning process has dust, if the ash cleaning process is not closed and manual dust removal is adopted, the dust is sucked into human bodies, which is unfavorable to health and pollutes air, so that the development of the closed automatic ash blowing device is necessary to protect the human health and the atmospheric environment.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides the high-efficiency soot blower for the SCR denitration catalyst, and the soot blower removes dust from the catalyst by combining various forms of pressure multiple change, positive and negative pressure change and sudden change, so that the soot blowing effect is obviously improved.
The specific technical scheme of the invention is as follows:
a high-efficiency soot blower for an SCR denitration catalyst comprises a blowing unit, a placing platform and a negative pressure unit, wherein the blowing unit is connected with an air compressor, the placing platform is used for the catalyst, the negative pressure unit comprises a blowing chamber and a dust removing chamber which are separated by a partition plate, the placing platform is positioned in the blowing chamber, the blowing unit is arranged at the top of the blowing chamber, the negative pressure unit comprises an air suction channel, an air inlet of which is upward and is positioned below the placing platform, a screen plate is arranged at the air inlet, and the air suction channel penetrates through the partition plate and is connected with the negative pressure; the blowing unit comprises a blowing pipe fixed at the top of the blowing chamber by a horizontal moving mechanism, the tail end of the blowing pipe is provided with a circular cavity, a rotating frame is arranged in the circular cavity, sealing rolling balls matched with an air outlet of the circular cavity are uniformly distributed on the circumference of the rotating frame, and the sealing rolling balls are arranged on the rotating frame by an elastic support; be provided with the funnel in the passageway induced drafts, the funnel forms the switching unit of the passageway induced drafts with the help of the atmospheric pressure change that sweeps the room, the funnel is the silica gel material.
The middle part of the purging pipe is provided with a rubber inflation ball, and the wall thickness of the rubber inflation ball is not less than 2 mm.
Horizontal migration mechanism include fixed plate and the sharp slip table of upper end thereof, the fixed plate is provided with the cooperation slot hole that sets up along sharp slip table direction of motion, the mobile unit of sharp slip table with sweep a tub fixed connection, sweep the pipe and pass cooperation slot hole and vertical setting downwards, the level is fixed with the rubber curtain of one side open-ended in the cooperation slot hole, opening one side contacts with sweeping the pipe.
The movable unit of the linear sliding table is provided with a rotatable lifting nut, the upper end of the purging pipe penetrates through the lifting nut and forms threaded fit with the lifting nut, and the purging pipe has lifting freedom degree by means of the lifting nut.
The unit that sweeps still include the controller, set up and sweep indoor hall sensor, connect the solenoid valve between sweeping pipe and air compressor machine, hall sensor, controller, solenoid valve connect gradually and form into on-off control system, both ends all are provided with proximity switch about sharp slip table, proximity switch, controller, the mobile unit of sharp slip table connect gradually and form into the switching-over system that sweeps the pipe.
And the blowing chamber is provided with a water cooling circulation system coiled in a snake shape on the upper part of the horizontal moving mechanism.
The edge of the placing platform is wrapped with a rubber layer, and the upper end face of the rubber layer is provided with a notch matched with the fork shape of the forklift.
The negative pressure unit comprises a bag-type dust remover and a negative pressure fan, wherein the bag-type dust remover is positioned in the dust removing chamber, the negative pressure fan is arranged above the bag-type dust remover and is communicated with the bag-type dust remover, and an inlet of the bag-type dust remover is communicated with an outlet of the air suction channel.
And a compressed air storage tank is also arranged in the dust removing chamber, and an outlet of the compressed air storage tank is communicated with an air compressor.
The invention has the beneficial effects that: the invention carries out the injection of the catalyst by means of the circular cavity with the rotating frame, the sealed rolling balls on the rotating frame are sequentially matched with the air outlet at intervals in a sealing way, and an intermittent air outlet state is formed, compared with the dynamic stability formed when the continuous air blowing is carried out for removing the dust, the dynamic stability is more favorable for the injection removal of the dust adhered on the catalyst;
the arrangement of the rubber inflatable ball is combined with the state of the sealed rolling ball, when the sealing is carried out, the rubber inflatable ball is subjected to transient deformation inflation, when the sealing state disappears, gas in the rubber inflatable ball is blown out, the air outlet pressure of the purging pipe is subjected to sudden increase and mutation, the change node is added to the pressure change curve which is arranged to be regular, the removal pressure is increased to dust which is bonded on the catalyst and is not easy to blow down, and the removal effect is obviously improved;
the funnel pipe of the silica gel material that induced drafts and set up in the passageway, when receiving the negative pressure absorption and sealed spin and be in encapsulated situation, the whole room that sweeps is in the negative pressure state, funnel pipe tip is closed gradually, when sealed spin is in the non-encapsulated situation, the room pressure that sweeps increases gradually, the funnel pipe is opened, the whole sudden change that sweeps room atmospheric pressure forms the vibration, the dust that catalyst surface bonded is under the alternating variation vibration of negative pressure and malleation, its not hard up and the rate of dropping is showing and is improving, final soot blowing effect is showing and is improving.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a left side view of fig. 1.
Fig. 4 is a view showing the internal structure of the circular chamber of fig. 1.
Fig. 5 is a schematic structural view of the elastic stent of fig. 4.
In the attached drawing, 1, a purging chamber, 2, a dust removing chamber, 3, a negative pressure fan, 4, a bag-type dust remover, 5, a partition plate, 6, an air suction channel, 601, a screen plate, 7, a purging pipe, 8, a linear sliding table, 801, a moving unit, 9, a placing platform, 11, a circular cavity, 12, a lifting nut, 13, a compressed air storage tank, 14, a rotating frame, 15, a sealing rolling ball, 16, an elastic support, 1601, a loop bar, 1602, a sliding rod, 1603, a spring, 17, a funnel pipe, 18 and a rubber inflation ball.
Detailed Description
The invention relates to a high-efficiency soot blower for an SCR (selective catalytic reduction) denitration catalyst, which comprises a blowing unit connected with an air compressor, a placing platform 9 for the catalyst and a negative pressure unit, wherein the soot blower comprises a blowing chamber 1 and a dust removing chamber 2 which are separated by a partition plate 5, the placing platform 9 is positioned in the blowing chamber 1, the blowing unit is arranged at the top of the blowing chamber 1, the negative pressure unit comprises an air suction channel 6 with an upward air inlet and positioned below the placing platform 9, a screen plate 601 is arranged at the air inlet, and the air suction channel 6 penetrates through the partition plate 5 and is connected with the negative pressure unit; the purging unit comprises a purging pipe 7 fixed at the top of the purging chamber 1 by means of a horizontal moving mechanism, a circular cavity 11 is arranged at the tail end of the purging pipe 7, a rotating frame 14 is arranged in the circular cavity 11, sealing rolling balls 15 matched with an air outlet of the circular cavity 11 are uniformly distributed on the circumference of the rotating frame 14, and the sealing rolling balls 15 are installed on the rotating frame 14 by means of an elastic support 16; be provided with funnel 17 among the passageway 6 that induced drafts, funnel 17 forms the switching unit of passageway 6 that induced drafts with the help of the atmospheric pressure change that sweeps room 1, funnel 17 is the silica gel material.
In a specific embodiment, as shown in fig. 1 to 5, the negative pressure unit comprises a bag-type dust collector 4 located inside the dust removing chamber 2, and a negative pressure fan 3 disposed above the bag-type dust collector 4 and communicated with the bag-type dust collector 4, an inlet of the bag-type dust collector 4 is communicated with an outlet of the air suction channel 6, and the negative pressure fan 3 can make dust blown off by the blowing unit quickly enter the bag-type dust collector 4, thereby preventing the dust from accumulating in the air suction channel 6 and affecting the dust removing efficiency, the bag-type dust collector 4 selects an MC-11-120 pulse type bag filter, and is provided with 120 bags, and the air volume of the negative pressure fan 3 is 10000m3H, wind pressure not less than 2500Pa, and filter area of 60-90m2An ash collecting hopper is arranged below the bag-type dust collector 4 and can be cleaned regularly;
an operation door is arranged on the side wall of the blowing chamber 1, so that the catalyst is conveniently taken and placed, and a maintenance door is arranged on the side wall of the dust removing chamber 2, so that the bag-type dust remover 4 is conveniently cleaned and maintenance operation is conveniently carried out;
the horizontal moving mechanism comprises a fixed plate and a linear sliding table 8 at the upper end of the fixed plate, the fixed plate is provided with a matching long hole arranged along the motion direction of the linear sliding table 8, a moving unit 801 of the linear sliding table 8 is fixedly connected with a purging pipe 7, the purging pipe 7 penetrates through the matching long hole and is vertically and downwards arranged, a rubber curtain with an opening at one side is horizontally fixed in the matching long hole, and one side of the opening is in contact with the purging pipe 7; a movable unit 801 of the linear sliding table 8 is provided with a rotatable lifting nut 12, the upper end of the purging pipe 7 penetrates through the lifting nut 12 and forms threaded fit with the lifting nut 12, and the purging pipe 7 has lifting freedom degree by virtue of the lifting nut 12; the purging pipe 7 can be adjusted in the horizontal position and the height, so that the distance between the purging pipe 7 and the catalyst is kept about 100mm, and a good purging effect is ensured.
The purging unit further comprises a controller, a Hall sensor arranged in the purging chamber 1 and an electromagnetic valve connected between the purging pipe 1 and the air compressor, the Hall sensor, the controller and the electromagnetic valve are sequentially connected to form an on-off control system, the left end and the right end of the linear sliding table 8 are provided with proximity switches, and the proximity switches, the controller and the moving unit 801 of the linear sliding table 8 are sequentially connected to form a reversing system of the purging pipe 7; when the purging pipe 7 reaches a designated position, the Hall sensor is attracted to enable the electromagnetic valve to be switched on, compressed air in the air compressor enters the purging pipe 7 through the electromagnetic valve, the catalyst below is purged through the purging pipe, the purging pipe moves from one end of the linear sliding table to the other end during purging, the catalyst is transversely and linearly purged, when the purging pipe 7 moves to one end of the linear sliding table 8, the proximity switch at the end is triggered, the linear sliding table 8 reversely runs through the controller through the proximity switch, and the purging pipe 7 starts to reversely move and purge until the catalyst is purged;
the rotating frame 14 is driven by a rotating motor arranged on a rotating shaft of the rotating frame, a rotating shaft is arranged in the middle of the sealed rolling ball 15, the elastic support 16 is a telescopic rod fixed between the outer circumference of the rotating frame 14 and the end part of the rotating shaft, the telescopic rod comprises a sleeve rod 1601 and a sliding rod 1602, a spring 1603 is sleeved on the sliding rod 1602, a limiting structure of the spring 1603 is formed by the end part of the sleeve rod 1601 and the outer circumference of the rotating frame 14, two ends of each rotating shaft are respectively provided with one elastic support 16, the catalyst is injected by virtue of a circular cavity 11 with the rotating frame 14, the sealed rolling balls 15 on the rotating frame 14 sequentially rotate and are in sealed fit with the air outlet at intervals, an intermittent air outlet state is formed, and compared with the dynamic stability formed when dust is removed by continuous blowing, the dust adhered to;
in addition, the middle part of the purging tube 7 is provided with a rubber inflation ball 18, the wall thickness of the rubber inflation ball 18 is not less than 2mm, the wall thickness enables the rubber inflation ball 18 to have certain strength and not to be blown open, the deformation is small, a certain amount of gas can be gathered and then suddenly blown out to change the air pressure, the rubber inflation ball 18 is arranged and combined with the state of the sealed rolling ball 15, when the sealed rolling ball 15 rotates to be matched and sealed with the air outlet of the circular cavity 11 on the purging tube 7, the rubber inflation ball 18 is subjected to transient deformation inflation, after the sealing state disappears, the gas in the rubber inflation ball 18 is blown out to suddenly increase and suddenly change the air outlet pressure of the purging tube 7, the change curve of the pressure set to be regular increases the change node, the removal pressure is increased for dust which is bonded on the catalyst and is not easy to blow down, and the removal effect is obviously improved;
funnel 17 of the silica gel material that induced drafts and set up in the passageway 6, when receiving the negative pressure absorption and sealed spin 15 and be in encapsulated situation, whole room 1 that sweeps is in the negative pressure state, funnel 17 tip is closed gradually, when sealed spin 15 is in the non-encapsulated situation, sweep 1 pressure of room and increase gradually, funnel 17 opens, the sudden change of the whole room 1 atmospheric pressure that sweeps forms the vibration, the dust that the catalyst surface bonded is under the alternating vibration of negative pressure and malleation, it is not hard up and the rate of dropping is showing and is improving, final soot blowing effect is showing and is improving.
In order to avoid the influence of temperature rise on the working state of the linear sliding table 8 in the working process, a water cooling circulation system coiled in a snake shape is arranged on the upper part of the horizontal moving mechanism of the blowing chamber 1, and the temperature in the blowing chamber is kept within a certain preset range; the edge of the placing platform 9 is wrapped by a rubber layer, openings matched with the fork shape of a forklift are formed in the upper end face of the rubber layer, and the forklift or other fork taking devices can conveniently take, place and replace the catalyst and the placing platform. Still be provided with compressed air storage tank 13 in the clean room 2, compressed air storage tank 13's export and air compressor machine intercommunication, when air compressor machine pressure is not enough, can utilize compressed air storage tank 13 to keep in and carry compressed gas for the air compressor machine.
Claims (9)
1. The utility model provides a high-efficient soot blower for SCR denitration catalyst, the device include with the air compressor machine link to each other sweep the unit, be used for place platform (9) and the negative pressure unit of catalyst, its characterized in that: the soot blower comprises a blowing chamber (1) and a dust removing chamber (2) which are separated by a partition plate (5), a placing platform (9) is positioned in the blowing chamber (1), a blowing unit is arranged at the top of the blowing chamber (1), a negative pressure unit comprises an air suction channel (6) with an upward air inlet and positioned below the placing platform (9), a screen plate (601) is arranged at the air inlet, and the air suction channel (6) penetrates through the partition plate (5) and is connected with the negative pressure unit; the blowing unit comprises a blowing pipe (7) fixed at the top of the blowing chamber (1) by means of a horizontal moving mechanism, a circular cavity (11) is formed in the tail end of the blowing pipe (7), a rotating frame (14) is arranged in the circular cavity (11), sealing rolling balls (15) matched with an air outlet of the circular cavity (11) are uniformly distributed on the circumference of the rotating frame (14), and the sealing rolling balls (15) are installed on the rotating frame (14) by means of an elastic support (16); be provided with funnel (17) in the passageway (6) induced drafts, funnel (17) change with the help of the atmospheric pressure that sweeps room (1) and form the switching unit of passageway (6) induced drafts, funnel (17) are the silica gel material.
2. The efficient soot blower for an SCR denitration catalyst according to claim 1, wherein: the middle part of the purging pipe (7) is provided with a rubber inflation ball (18), and the wall thickness of the rubber inflation ball (18) is not less than 2 mm.
3. The efficient soot blower for an SCR denitration catalyst according to claim 1, wherein: horizontal migration mechanism include fixed plate and sharp slip table (8) of upper end thereof, the fixed plate is provided with the cooperation slot hole that sets up along sharp slip table (8) direction of motion, mobile unit (801) of sharp slip table (8) with sweep pipe (7) fixed connection, sweep pipe (7) and pass cooperation slot hole and vertical setting downwards, the level is fixed with one side open-ended rubber curtain in the cooperation slot hole, opening one side with sweep pipe (7) and contact.
4. The efficient soot blower for an SCR denitration catalyst according to claim 3, wherein: the movable unit (801) of the linear sliding table (8) is provided with a rotatable lifting nut (12), the upper end of the purging pipe (7) penetrates through the lifting nut (12) and forms threaded fit with the lifting nut, and the purging pipe (7) has a lifting degree of freedom by means of the lifting nut (12).
5. The efficient soot blower for an SCR denitration catalyst according to claim 1, wherein: the purging unit further comprises a controller, a Hall sensor arranged in the purging chamber (1), and an electromagnetic valve connected between the purging pipe (1) and the air compressor, wherein the Hall sensor, the controller and the electromagnetic valve are sequentially connected to form an on-off control system, proximity switches are arranged at the left end and the right end of the linear sliding table (8), and a moving unit (801) of the proximity switches, the controller and the linear sliding table (8) is sequentially connected to form a reversing system for purging the pipe (7).
6. The efficient soot blower for an SCR denitration catalyst according to claim 1, wherein: and a water cooling circulation system coiled in a snake shape is arranged at the upper part of the horizontal moving mechanism of the blowing chamber (1).
7. The efficient soot blower for an SCR denitration catalyst according to claim 1, wherein: the edge of the placing platform (9) is wrapped with a rubber layer, and the upper end face of the rubber layer is provided with an opening matched with the fork shape of the forklift.
8. The efficient soot blower for an SCR denitration catalyst according to claim 1, wherein: the negative pressure unit comprises a bag-type dust collector (4) arranged in the dust removing chamber (2) and a negative pressure fan (3) arranged above the bag-type dust collector (4) and communicated with the bag-type dust collector (4), and an inlet of the bag-type dust collector (4) is communicated with an outlet of the air suction channel (6).
9. The efficient soot blower for an SCR denitration catalyst according to claim 1, wherein: the dust removal chamber (2) in still be provided with compressed air storage tank (13), the export and the air compressor machine intercommunication of compressed air storage tank (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376853.XA CN109200821B (en) | 2018-11-19 | 2018-11-19 | A high-efficient soot blower for SCR denitration catalyst |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376853.XA CN109200821B (en) | 2018-11-19 | 2018-11-19 | A high-efficient soot blower for SCR denitration catalyst |
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| CN109200821A CN109200821A (en) | 2019-01-15 |
| CN109200821B true CN109200821B (en) | 2020-05-05 |
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| CN201811376853.XA Active CN109200821B (en) | 2018-11-19 | 2018-11-19 | A high-efficient soot blower for SCR denitration catalyst |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112774335B (en) * | 2020-12-22 | 2022-06-14 | 东莞汇乐技术股份有限公司 | Filter bag type deodorization and dust removal air purification device |
| CN114351085B (en) * | 2021-12-30 | 2024-04-09 | 苏州吉恒纳米科技有限公司 | Heat treatment purging equipment before vacuum coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8268743B2 (en) * | 2011-05-04 | 2012-09-18 | Steag Energy Services Gmbh | Pluggage removal method for SCR catalysts and systems |
| CN204380515U (en) * | 2014-12-31 | 2015-06-10 | 河北汉唐宏远环保科技有限公司 | Portable SCR honeycomb denitrating catalyst deashing device |
| CN105056761B (en) * | 2015-08-26 | 2017-10-20 | 浙江浙能催化剂技术有限公司 | SCR denitration regenerates the deashing device in duct |
| CN105561788B (en) * | 2015-12-14 | 2018-11-16 | 江苏肯创催化剂再生技术有限公司 | A kind of SCR catalyst module deashing device |
| CN106678846A (en) * | 2016-12-14 | 2017-05-17 | 北京神雾环境能源科技集团股份有限公司 | Soot blower |
| CN107185908A (en) * | 2017-05-10 | 2017-09-22 | 哈尔滨工程大学 | A kind of soot blower and ash-blowing method in denitrating system rectangle reaction unit peculiar to vessel |
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