CN117046276B - Desulfurization and denitrification system and process for coked flue gas - Google Patents
Desulfurization and denitrification system and process for coked flue gas Download PDFInfo
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- CN117046276B CN117046276B CN202311321673.2A CN202311321673A CN117046276B CN 117046276 B CN117046276 B CN 117046276B CN 202311321673 A CN202311321673 A CN 202311321673A CN 117046276 B CN117046276 B CN 117046276B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 179
- 239000003546 flue gas Substances 0.000 title claims abstract description 179
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 53
- 230000023556 desulfurization Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 77
- 238000002156 mixing Methods 0.000 claims abstract description 77
- 239000000428 dust Substances 0.000 claims abstract description 27
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000004744 fabric Substances 0.000 claims abstract description 12
- 239000002918 waste heat Substances 0.000 claims abstract description 12
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 69
- 238000007789 sealing Methods 0.000 claims description 67
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 30
- 239000000779 smoke Substances 0.000 claims description 17
- 238000001125 extrusion Methods 0.000 claims description 15
- 229910021529 ammonia Inorganic materials 0.000 claims description 13
- 239000003921 oil Substances 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 7
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 238000004939 coking Methods 0.000 abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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
- B01D53/75—Multi-step processes
-
- 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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- B01D53/8631—Processes characterised by a specific device
-
- 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
- B01D53/885—Devices in general for catalytic purification of waste gases
-
- 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)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a desulfurization and denitrification system and a process of coking flue gas, belonging to the technical field of coking flue gas treatment, wherein the desulfurization and denitrification system of coking flue gas comprises a hot blast stove, an SCR denitrification device, a waste heat boiler, an SDS desulfurization device, a cloth bag dust removal device and an induced draft fan; the hot blast stove is used for heating the flue gas; the SCR denitration device is used for denitration of the flue gas; the waste heat boiler is used for absorbing heat of the flue gas; the SDS desulfurization device is used for desulfurizing the flue gas; the cloth bag dust removing device is used for removing dust from the flue gas; the induced draft fan is used for discharging the flue gas into the chimney; the SCR denitration device comprises a flue gas mixing box, and a connecting box is communicated with the bottom of the front of the flue gas mixing box; a detection mechanism is arranged in the connecting box; a replacement mechanism is arranged at the bottom of the flue gas mixing box; the invention can automatically complete the replacement of the catalyst under the condition of not stopping the flue gas flowing into the flue gas mixing box, ensures the efficiency of flue gas denitration, simultaneously can automatically replace the catalyst at the first time, and ensures the effect of flue gas denitration.
Description
Technical Field
The invention relates to the technical field of coking flue gas treatment, in particular to a desulfurization and denitrification system and process for coking flue gas.
Background
The coking flue gas emission characteristics are low sulfur, low dust, high nitrogen oxide, and the current desulfurization trend is in a dry desulfurization dust removal and denitration trend is in an SCR denitration mode.
The existing flue gas treatment mode generally adopts a process of desulfurizing and then denitrifying, and the flue gas treatment mode needs to be mixed with ammonia gas during denitrification, so that the emission value of ammonia escaping after denitrification is higher; during denitration, a catalyst is required to be used for promoting the reaction of nitrogen oxides in flue gas and ammonia in a high-temperature environment, and the activity of the catalyst is reduced after a long time, so that after the catalyst is used for a period of time, the catalyst needs to be replaced, the operation of the denitration equipment needs to be stopped when the catalyst is replaced by the existing equipment, and then the catalyst is replaced, so that the efficiency of flue gas denitration can be reduced; in addition, after the activity of the catalyst is reduced, the content of nitrogen oxides in the flue gas passing through the catalyst is higher, so that the flue gas can be easily and directly circulated to the next process, and incomplete flue gas denitration can be caused.
Disclosure of Invention
The invention aims to provide a desulfurization and denitrification system and process for coking flue gas, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a desulfurization and denitrification system for coked flue gas comprises a hot blast stove, an SCR denitrification device, a waste heat boiler, an SDS desulfurization device, a cloth bag dust removal device and an induced draft fan; the hot blast stove is used for heating the flue gas which is introduced into the SCR denitration device to the optimal denitration temperature; the SCR denitration device is used for carrying out denitration treatment on the flue gas; the waste heat boiler is used for absorbing heat of the flue gas after denitration, so that the flue gas is cooled to the optimal desulfurization temperature; the SDS desulfurization device is used for desulfurizing the flue gas; the cloth bag dust removing device is used for carrying out dust removing treatment on the flue gas; the induced draft fan is used for discharging flue gas subjected to denitration, desulfurization and dust removal into a chimney;
the SCR denitration device comprises a flue gas mixing box, and a connecting box is communicated with the bottom of the front of the flue gas mixing box; a catalyst is arranged between the flue gas mixing box and the connecting box, and the catalyst is split-packed in the frame; a detection mechanism is arranged in the connecting box and is used for detecting whether the flue gas entering the connecting box contains nitrogen oxides or not; the flue gas mixing box bottom position is equipped with the change mechanism, change mechanism is used for when detecting that the flue gas contains nitrogen oxide in the flue gas, under the condition that need not stop letting in the flue gas, accomplish the change of catalyst automatically.
The detection mechanism comprises a nitrogen oxide detector which is positioned in the connecting box and fixedly connected with the connecting box; a connecting pipe is arranged above the connecting box, and two ends of the connecting pipe are respectively communicated with the connecting box and the flue gas mixing box; the connecting pipe is provided with an air extraction mechanism, and the air extraction mechanism is used for extracting the flue gas in the connecting box into the flue gas mixing box.
The air exhaust mechanism comprises a first motor, the first motor is fixedly connected with the connecting pipe, the bottom end of an output shaft of the first motor is fixedly connected with a fan blade, and the fan blade is positioned in the connecting pipe and is rotationally connected with the connecting pipe; the front end of the connecting box is provided with a first sealing mechanism which is used for sealing the connecting box; the connecting pipe is provided with a second sealing mechanism which is used for sealing the connecting pipe.
The first sealing mechanism comprises a plurality of rotating plates which are uniformly distributed at the front end opening position of the connecting box and are in rotary connection with the connecting box; the distance between the two rotating plates is equal to the width of one rotating plate; the left side and the right side of the rotating plate are symmetrically and fixedly connected with a first rotating rod; driving rods are symmetrically arranged at the left side and the right side of the connecting box and are attached to each first rotating rod; the driving rod is connected with a pull rod in a sliding manner, a first spring is sleeved on the pull rod, one end of the first spring is fixedly connected with the pull rod, and the other end of the first spring is fixedly connected with the driving rod.
The second sealing mechanism comprises a sealing frame which is fixedly connected with the connecting pipe and the flue gas mixing box; a sealing plate is connected in a sliding manner in the sealing frame, a driving frame is fixedly connected to the sealing plate, and the driving frame is fixedly connected with pull rods on the left side and the right side; the left side and the right side of the connecting box are symmetrically and fixedly connected with first hydraulic cylinders, and the telescopic ends of the first hydraulic cylinders are fixedly connected with the driving frame.
The replacing mechanism comprises a shell, and the shell is sleeved at the bottom of the flue gas mixing box; the shell and the smoke mixing box are both cylindrical, and the shell is fixedly connected with the smoke mixing box; the shell is fixedly connected with the connecting box, a first belt pulley is arranged above the shell, the first belt pulley is annular, three push rods are uniformly and fixedly connected to the bottom end of the first belt pulley, the three push rods are distributed on the first belt pulley in a circumferential array, and the push rods are positioned between two catalysts and are attached to the two catalysts; the first belt pulley is attached to the shell and is rotationally connected with the smoke mixing box; the catalyst is positioned between the shell and the smoke mixing box and is attached to the shell and the smoke mixing box, and three catalysts are arranged in the shell; the right side of the shell is provided with a sealing door which is in sealing fit with the shell and is rotationally connected with the shell; the shell is provided with a driving mechanism, the driving mechanism is used for driving three catalysts in the shell to simultaneously rotate anticlockwise by one hundred twenty degrees, and after the three catalysts rotate by one hundred twenty degrees, the sealing door is driven to rotate downwards by ninety degrees.
The driving mechanism comprises a second motor, the second motor is fixedly connected with the smoke mixing box, the bottom end of an output shaft of the second motor is fixedly connected with a first threaded rod, and the bottom end of the first threaded rod is fixedly connected with the smoke mixing box; the first threaded rod is self-locking, the lifting frame is connected to the first threaded rod through threads, the lifting frame is in sliding connection with the smoke mixing box, the bottom end of the lifting frame is rotationally connected with the second threaded rod, and the second threaded rod is not self-locking; the shell is positioned at the bottom end of the second threaded rod and is rotationally connected with a second belt pulley, the second belt pulley is in threaded connection with the second threaded rod, a belt is arranged on the second belt pulley, and the belt is simultaneously meshed with the first belt pulley and the second belt pulley; the upper end part of the first threaded rod and the bottom end part of the second belt pulley are fixedly connected with a ratchet wheel, pawls are meshed with the surface of the ratchet wheel, and the pawls on the upper side and the lower side are fixedly connected with the lifting frame and the shell respectively; the ratchet wheel on the upper side and the lower side has opposite transmission directions; the housing is provided with a rotating mechanism for driving the sealing door to rotate ninety degrees downwards when the second threaded rod moves to the bottommost position.
The rotating mechanism comprises a pressing rod which is fixedly connected with the bottom end part of the second threaded rod; the sealing door is fixedly connected with a second rotating rod at the position of the connecting part of the sealing door and the shell, and the second rotating rod is positioned right below the pressing rod; the second rotating rod is sleeved with a torsion spring, one end of the torsion spring is fixedly connected with the shell, and the other end of the torsion spring is fixedly connected with the second rotating rod.
The left side and the right side of the flue gas mixing box are symmetrically and fixedly connected with a fixing frame, a second hydraulic cylinder is fixedly connected to the fixing frame, an extrusion frame is connected to the fixing frame in a sliding mode, and the extrusion frame is fixedly connected with the telescopic end of the second hydraulic cylinder; the extrusion frame is attached to the lifting frame, a second spring is fixedly connected to the extrusion frame, and the other end of the second spring is fixedly connected with the fixing frame; an oil pipe is arranged between the first hydraulic cylinder and the second hydraulic cylinder, and two ends of the oil pipe are respectively communicated with the first hydraulic cylinder and the second hydraulic cylinder; the first hydraulic cylinder, the second hydraulic cylinder and the oil pipe are filled with hydraulic oil.
A desulfurization and denitrification process for coked flue gas comprises the following specific steps:
step one: introducing high-temperature flue gas into a flue gas mixing box to be mixed with ammonia gas;
step two: the mixed flue gas and ammonia are catalyzed by a catalyst and then are subjected to nitrogen oxide removal, and enter a connecting box;
step three: after the detection mechanism detects that the activity of the catalyst disappears, the replacement mechanism is driven to operate;
step four: the replacement mechanism automatically completes the replacement of the catalyst under the condition that the flue gas is not stopped from being introduced into the flue gas mixing box.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, the flue gas enters the SCR denitration device through the inlet gate valve, and when entering the SCR denitration device, the flue gas is heated to 260 ℃ through the hot air blower, the temperature is the optimal temperature for denitration reaction, the temperature range can be selected from a plurality of catalyst types, and manganese-based catalysts and vanadium-titanium-based catalysts (manganese-based catalysts are selected in the project), so that the purchase price is low, and the denitration efficiency is high; the flue gas enters the SDS desulfurization device after denitration, when the flue gas enters the SDS desulfurization device, the heat of the flue gas is absorbed by the waste heat boiler, so that the temperature of the flue gas entering the SDS denitration system is ensured to be less than or equal to 240 ℃, the optimal desulfurization temperature is achieved, and the cloth bag cannot be burnt out due to the fact that the temperature of the flue gas is too high after the flue gas enters the cloth bag dust removal device after desulfurization; the flue gas after dust removal is discharged to a chimney through an outlet gate valve under the action of an induced draft fan; according to the invention, ammonia escape can be ensured to further react in a subsequent desulfurization dust removal device through a denitration and desulfurization process, and the requirement that the ammonia escape of a chimney discharge port is less than or equal to 3ppm can be met. SO2 added in the hot blast stove fuel can be removed in a subsequent desulfurization and dust removal device.
After entering a smoke mixing box and being mixed with ammonia, the smoke is subjected to denitration under the catalysis of a catalyst in a high-temperature environment, then enters a connecting box, and enters the next working procedure through the connecting box; after the activity of catalyst reduces, flue gas denitration effect variation can detect out that the nitrogen oxide content in the flue gas that enters into the junction box is more through detection mechanism, and detection mechanism drive change mechanism operation this moment, change mechanism then can accomplish the change of catalyst under the condition of not stopping leading to the flue gas in the flue gas mixing box automatically, has guaranteed flue gas denitration's efficiency, simultaneously can also change the catalyst in the very first time automatically, has guaranteed flue gas denitration's effect.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the present invention;
FIG. 3 is a schematic rear view of the present invention;
FIG. 4 is a schematic view of a split structure of the present invention;
FIG. 5 is a schematic view of a partial cross-sectional structure of a connecting pipe according to the present invention;
FIG. 6 is a schematic view of the structure of the junction box of the present invention;
FIG. 7 is a schematic view of the structure of the flue gas mixing box according to the present invention;
FIG. 8 is a schematic diagram of a split structure of the flue gas mixing box according to the present invention;
FIG. 9 is a schematic diagram of a driving mechanism according to the present invention;
FIG. 10 is a schematic view of a second pulley according to the present invention;
FIG. 11 is a schematic view of the structure of the catalyst of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. a flue gas mixing box; 2. a connection box; 3. a catalyst; 4. a nitrogen oxide detector; 5. a connecting pipe; 6. a first motor; 7. a fan blade; 8. a rotating plate; 9. a first rotating lever; 10. a driving rod; 11. a pull rod; 12. a first spring; 13. a sealing frame; 14. a sealing plate; 15. a drive rack; 16. a first hydraulic cylinder; 17. a housing; 18. a first pulley; 19. a push rod; 20. sealing the door; 21. a second motor; 22. a first threaded rod; 23. a lifting frame; 24. a second threaded rod; 25. a second pulley; 26. a belt; 27. a ratchet wheel; 28. a pawl; 29. pressing a pressing rod; 30. a second rotating lever; 31. a torsion spring; 32. a fixing frame; 33. a second hydraulic cylinder; 34. an extrusion frame; 35. a second spring; 36. and (5) an oil pipe.
Detailed Description
Referring to fig. 1 to 11, the present invention provides a technical solution: a desulfurization and denitrification system and process for coked flue gas comprises a hot blast stove, an SCR denitrification device, a waste heat boiler, an SDS desulfurization device, a bag-type dust removal device and an induced draft fan; the hot blast stove is used for heating the flue gas which is introduced into the SCR denitration device to the optimal denitration temperature; the SCR denitration device is used for carrying out denitration treatment on the flue gas; the waste heat boiler is used for absorbing heat of the flue gas after denitration, so that the flue gas is cooled to the optimal desulfurization temperature; the SDS desulfurization device is used for desulfurizing the flue gas; the cloth bag dust removing device is used for carrying out dust removing treatment on the flue gas; the induced draft fan is used for discharging the flue gas subjected to denitration, desulfurization and dust removal into a chimney; (the hot blast stove, the waste heat boiler, the SDS desulfurization device, the cloth bag dust removing device and the induced draft fan are all in the prior art, and the invention does not describe the hot blast stove in detail);
through the mode of firstly denitration and then desulfurization, excessive ammonia of the front-end SCR denitration device can be continuously deposited in a waste heat boiler and a bag-type dust collector, and ammonia escape is lower in emission value compared with the mode of firstly desulfurization and then denitration; because SO2 is generated when the coke oven gas is combusted by the hot blast stove, the influence of the SO2 on the emission index of the desulfurization and denitrification device caused by the hot blast stove can be perfectly solved by the front denitration and the rear desulfurization;
the SCR denitration device comprises a flue gas mixing box 1, and a connecting box 2 is connected to the bottom of the front part of the flue gas mixing box 1; a catalyst 3 is arranged between the flue gas mixing box 1 and the connecting box 2, and the catalyst 3 is split-packed in the frame; a detection mechanism is arranged in the connecting box 2 and is used for detecting whether the flue gas entering the connecting box 2 contains nitrogen oxides or not; the bottom of the flue gas mixing box 1 is provided with a replacement mechanism which is used for automatically completing the replacement of the catalyst 3 under the condition that the flue gas does not need to be stopped from being introduced when the detection mechanism detects that the flue gas contains nitrogen oxides;
as shown in fig. 2 and 7, when the flue gas needs to be treated, the flue gas enters the SCR denitration device through the inlet gate valve, and when the flue gas enters the SCR denitration device, the flue gas is heated to 260 ℃ through the hot air blower, the temperature is the optimal temperature for denitration reaction, and the catalyst which can be selected in the temperature range can be manganese-based catalyst or vanadium-titanium-based catalyst, and is generally manganese-based catalyst, so that the purchase price is low, and the denitration efficiency is high; the flue gas enters the SDS desulfurization device after denitration, when the flue gas enters the SDS desulfurization device, the heat of the flue gas is absorbed by the waste heat boiler, so that the temperature of the flue gas entering the SDS denitration system is ensured to be less than or equal to 240 ℃, the optimal desulfurization temperature is achieved, and the cloth bag cannot be burnt out due to the fact that the temperature of the flue gas is too high after the flue gas enters the cloth bag dust removal device after desulfurization; the flue gas after dust removal is discharged to a chimney under the action of an induced draft fan; according to the invention, ammonia escape can be ensured to further react in a subsequent desulfurization dust removal device through a denitration and desulfurization process, and the requirement that the ammonia escape of a chimney discharge port is less than or equal to 3ppm can be met. SO2 added to the hot blast stove fuel can be removed in a subsequent desulfurization and dust removal device;
in the SCR denitration device, after the flue gas enters a flue gas mixing box 1 and is mixed with ammonia gas, denitration is completed under the high-temperature environment after catalysis of a catalyst 3, and then the flue gas enters a connecting box 2 and enters the next working procedure through the connecting box 2; after the activity of the catalyst 3 is reduced, the flue gas denitration effect is poor, the content of nitrogen oxides in the flue gas entering the connecting box 2 can be detected to be more through the detection mechanism, the detection mechanism drives the replacement mechanism to operate at the moment, the replacement mechanism can automatically complete the replacement of the catalyst 3 under the condition that the flue gas is not stopped to be introduced into the flue gas mixing box 1, the flue gas denitration efficiency is ensured, the catalyst 3 can be automatically replaced at the first time, and the flue gas denitration effect is ensured.
As a further aspect of the present invention, as shown in fig. 6, the detecting mechanism includes a nitrogen oxide detector 4, and the nitrogen oxide detector 4 is located in the connection box 2 and is fixedly connected with the connection box 2; a connecting pipe 5 is arranged above the connecting box 2, and two ends of the connecting pipe 5 are respectively communicated with the connecting box 2 and the flue gas mixing box 1; the connecting pipe 5 is provided with an air extraction mechanism which is used for extracting the flue gas in the connecting box 2 into the flue gas mixing box 1;
when the operation, when nitrogen oxide detector 4 detects that the flue gas that gets into in the connection box 2 contains higher nitrogen oxide, nitrogen oxide detector 4 drive pumping mechanism operation this moment, and pumping mechanism then can take the flue gas in the connection box 2 into flue gas mixing box 1 and denitration again.
As shown in fig. 5-6, as a further scheme of the invention, the air extraction mechanism comprises a first motor 6, the first motor 6 is fixedly connected with a connecting pipe 5, the bottom end of an output shaft of the first motor 6 is fixedly connected with a fan blade 7, and the fan blade 7 is positioned in the connecting pipe 5 and is rotationally connected with the connecting pipe 5; the front end of the connecting box 2 is provided with a first sealing mechanism which is used for sealing the connecting box 2; the connecting pipe 5 is provided with a second sealing mechanism which is used for sealing the connecting pipe 5;
the first sealing mechanism comprises a plurality of rotating plates 8, the rotating plates 8 are uniformly distributed at the front end opening position of the connecting box 2, and the rotating plates 8 are rotationally connected with the connecting box 2; the distance between the two rotating plates 8 is equal to the width of one rotating plate 8; the left side and the right side of the rotating plate 8 are symmetrically and fixedly connected with a first rotating rod 9; the driving rods 10 are symmetrically arranged at the left side and the right side of the connecting box 2, and the driving rods 10 are attached to each first rotating rod 9; the driving rod 10 is connected with a pull rod 11 in a sliding manner, a first spring 12 is sleeved on the pull rod 11, one end of the first spring 12 is fixedly connected with the pull rod 11, and the other end of the first spring is fixedly connected with the driving rod 10;
the second sealing mechanism comprises a sealing frame 13, and the sealing frame 13 is fixedly connected with the connecting pipe 5 and the flue gas mixing box 1; a sealing plate 14 is connected in a sliding manner in the sealing frame 13, a driving frame 15 is fixedly connected to the sealing plate 14, and the driving frame 15 is fixedly connected with the pull rods 11 at the left side and the right side; the left side and the right side of the connecting box 2 are symmetrically and fixedly connected with a first hydraulic cylinder 16, and the telescopic end of the first hydraulic cylinder 16 is fixedly connected with a driving frame 15;
when the smoke gas mixing box 1 is required to be extracted from the connecting box 2 during operation, the fan blades 7 are driven to rotate by driving the first motor 6, and the smoke gas in the connecting box 2 is conveyed into the smoke gas mixing box 1 through the connecting pipe 5 when the fan blades 7 rotate; when the first motor 6 drives the fan blades 7 to rotate, the driving frame 15 is required to move upwards, the driving frame 15 drives the sealing plate 14 and the pull rods 11 on the left side and the pull rods 11 on the right side to move upwards, the pull rods 11 on the left side and the pull rods 11 on the right side drive the driving rods 10 on the left side to move upwards through the first springs 12, the driving rods 10 drive the first rotating rods 9 to rotate upwards when moving upwards, the first rotating rods 9 drive the rotating plates 8 connected with the first rotating rods to rotate upwards, and when the driving rods 10 move to the uppermost position, the rotating plates 8 just rotate ninety degrees, and at the moment, the upper ends and the lower ends of all the rotating plates 8 are mutually attached to seal the front ports of the connecting box 2; when the driving frame 15 continues to move upwards, the sealing plate 14 is driven to move upwards continuously, and when the driving rod 10 moves to the uppermost position, the connecting pipe 5 is completely communicated with the flue gas mixing box 1.
As shown in fig. 7-8 and 10, as a further scheme of the invention, the replacing mechanism comprises a shell 17, and the shell 17 is sleeved at the bottom of the flue gas mixing box 1; the shell 17 and the flue gas mixing box 1 are both cylindrical, and the shell 17 is fixedly connected with the flue gas mixing box 1; the shell 17 is fixedly connected with the connecting box 2, a first belt pulley 18 is arranged above the shell 17, the first belt pulley 18 is annular, three push rods 19 are uniformly and fixedly connected to the bottom end of the first belt pulley 18, the three push rods 19 are distributed on the first belt pulley 18 in a circumferential array, and the push rods 19 are positioned between the two catalysts 3 and are attached to the two catalysts 3; the first belt pulley 18 is attached to the shell 17 and is rotatably connected with the smoke mixing box 1; the catalyst 3 is positioned between the shell 17 and the flue gas mixing box 1 and is attached to the shell 17 and the flue gas mixing box 1, and three catalysts 3 are arranged in the shell 17; the right side of the shell 17 is provided with a sealing door 20, and the sealing door 20 is in sealing fit with the shell 17 and is in rotary connection with the shell 17; the shell 17 is provided with a driving mechanism which is used for driving the three catalysts 3 in the shell 17 to rotate one hundred twenty degrees anticlockwise at the same time and driving the sealing door 20 to rotate ninety degrees downwards after the three catalysts 3 rotate one hundred twenty degrees;
when the catalyst 3 is required to be replaced in operation, the first belt pulley 18 is driven to rotate, the first belt pulley 18 drives the three push rods 19 connected with the first belt pulley to rotate, and the three catalysts 3 in the shell 17 can be pushed to move along the rotating track of the first belt pulley 18 under the action of the three push rods 19; when the first pulley 18 rotates by one hundred twenty degrees, the catalyst 3 with the activity lost moves to the position of the sealing door 20, and the new catalyst 3 moves to the position between the flue gas mixing box 1 and the connecting box 2; when the catalyst 3 with the lost activity moves to the position of the sealing door 20, the sealing door 20 is driven to rotate downwards for ninety degrees, at the moment, the catalyst 3 with the lost activity can rotate downwards for ninety degrees along with the sealing door 20, then the catalyst 3 with the lost activity is taken down, a new catalyst 3 is placed on the sealing door 20, and finally the sealing door 20 is driven to rotate upwards to be in sealing fit with the shell 17; the new catalyst 3 is attached to the flue gas mixing box 1, and the catalyst 3 can be preheated through high-temperature flue gas in the flue gas mixing box 1, so that the catalyst 3 can quickly reach the optimal catalytic temperature during working.
As shown in fig. 8-9 and 11, as a further scheme of the invention, the driving mechanism comprises a second motor 21, the second motor 21 is fixedly connected with the flue gas mixing box 1, the bottom end of an output shaft of the second motor 21 is fixedly connected with a first threaded rod 22, and the bottom end of the first threaded rod 22 is fixedly connected with the flue gas mixing box 1; the first threaded rod 22 has self-locking property, the lifting frame 23 is connected to the first threaded rod 22 in a threaded manner, the lifting frame 23 is in sliding connection with the flue gas mixing box 1, the bottom end of the lifting frame 23 is rotationally connected with the second threaded rod 24, and the second threaded rod 24 does not have self-locking property; a second belt pulley 25 is rotatably connected to the bottom end of the second threaded rod 24 on the casing 17, the second belt pulley 25 is in threaded connection with the second threaded rod 24, a belt 26 is arranged on the second belt pulley 25, and the belt 26 is simultaneously meshed with the first belt pulley 18 and the second belt pulley 25; the upper end part of the first threaded rod 22 and the bottom end part of the second belt pulley 25 are fixedly connected with a ratchet wheel 27, pawls 28 are meshed with the surface of the ratchet wheel 27, and the pawls 28 on the upper side and the lower side are fixedly connected with the lifting frame 23 and the shell 17 respectively; the transmission directions of the ratchet wheels 27 at the upper side and the lower side are opposite; a rotation mechanism is provided on the housing 17 for driving the seal door 20 to rotate ninety degrees downwardly when the second threaded rod 24 is moved to the bottommost position;
the rotating mechanism comprises a pressing rod 29, and the pressing rod 29 is fixedly connected with the bottom end part of the second threaded rod 24; the sealing door 20 is fixedly connected with a second rotating rod 30 at the position where the sealing door is connected with the shell 17, and the second rotating rod 30 is positioned right below the pressing rod 29; a torsion spring 31 is sleeved on the second rotating rod 30, one end of the torsion spring 31 is fixedly connected with the shell 17, and the other end of the torsion spring 31 is fixedly connected with the second rotating rod 30;
when the catalyst 3 needs to be replaced, the second motor 21 is started to drive the first threaded rod 22 to rotate, the first threaded rod 22 drives the lifting frame 23 to move downwards when rotating, the lifting frame 23 drives the second threaded rod 24 to move downwards, the second threaded rod 24 does not rotate under the action of the ratchet wheel 27 and the pawl 28 connected with the second threaded rod 24 and drives the second belt pulley 25 to rotate, and the second belt pulley 25 drives the first belt pulley 18 to rotate through the belt 26; when the threaded portion of the first threaded rod 22 moves to the bottom position of the second belt pulley 25, the second belt pulley 25 just drives the first belt pulley 18 to rotate for hundred twenty degrees, and when the second threaded rod 24 continues to move downwards, the second belt pulley 25 does not rotate any more; when the pressing rod 29 on the second threaded rod 24 moves downwards to a position attached to the second rotating rod 30, the second rotating rod 30 drives the sealing door 20 to rotate downwards under the pressing of the pressing rod 29, and when the lifting frame 23 drives the second threaded rod 24 to move to the bottommost position, the sealing door 20 just rotates ninety degrees; when the catalyst 3 is replaced, the second motor 21 is started to drive the lifting frame 23 to move upwards, and when the lifting frame 23 moves upwards, the sealing door 20 is gradually reset under the action of the torsion spring 31, the second belt pulley 25 cannot rotate under the action of the ratchet wheel 27 and the pawl 28 connected with the sealing door, and the second threaded rod 24 rotates under the action of the second belt pulley 25.
As shown in fig. 7-8, as a further scheme of the invention, the left side and the right side of the flue gas mixing box 1 are symmetrically and fixedly connected with a fixing frame 32, a second hydraulic cylinder 33 is fixedly connected on the fixing frame 32, an extrusion frame 34 is slidingly connected on the fixing frame 32, and the extrusion frame 34 is fixedly connected with the telescopic end of the second hydraulic cylinder 33; the extrusion frame 34 is attached to the lifting frame 23, a second spring 35 is fixedly connected to the extrusion frame 34, and the other end of the second spring 35 is fixedly connected with the fixed frame 32; an oil pipe 36 is arranged between the first hydraulic cylinder 16 and the second hydraulic cylinder 33, and two ends of the oil pipe 36 are respectively communicated with the first hydraulic cylinder 16 and the second hydraulic cylinder 33; the first hydraulic cylinder 16, the second hydraulic cylinder 33 and the oil pipe 36 are all filled with hydraulic oil;
when the lifting frame 23 moves downwards, the lifting frame 23 can press the pressing frame 34 forwards so that the pressing frame 34 moves forwards relative to the fixed frame 32, the pressing frame 34 can start to compress the second hydraulic cylinder 33 at the moment, hydraulic oil in the second hydraulic cylinder 33 can enter the first hydraulic cylinder 16 through the oil pipe 36, and at the moment, the first hydraulic cylinder 16 can start to extend upwards and push the driving frame 15 to move upwards; when the lifting frame 23 is reset, the extrusion of the lifting frame 23 is lost, and the extrusion frame 34 is directly reset under the action of the second spring 35, so that the driving frame 15 can be reset.
As a further scheme of the invention, as shown in fig. 1, a desulfurization and denitrification process for coking flue gas comprises the following specific steps:
step one: introducing high-temperature flue gas into a flue gas mixing box 1 to be mixed with ammonia gas;
step two: the mixed flue gas and ammonia are catalyzed by a catalyst 3 and then are subjected to nitrogen oxide removal, and enter a connecting box 2;
step three: after the detection mechanism detects that the activity of the catalyst 3 disappears, the replacement mechanism is driven to operate;
step four: the replacement mechanism automatically completes the replacement of the catalyst 3 under the condition that the flue gas is not stopped from being introduced into the flue gas mixing box 1.
Claims (7)
1. A desulfurization and denitrification system for coked flue gas comprises a hot blast stove, an SCR denitrification device, a waste heat boiler, an SDS desulfurization device, a cloth bag dust removal device and an induced draft fan; the flue gas denitration device is characterized in that the hot blast stove is used for heating flue gas which is introduced into the SCR denitration device to the optimal denitration temperature; the SCR denitration device is used for carrying out denitration treatment on the flue gas; the waste heat boiler is used for absorbing heat of the flue gas after denitration, so that the flue gas is cooled to the optimal desulfurization temperature; the SDS desulfurization device is used for desulfurizing the flue gas; the cloth bag dust removing device is used for carrying out dust removing treatment on the flue gas; the induced draft fan is used for discharging flue gas subjected to denitration, desulfurization and dust removal into a chimney;
the SCR denitration device comprises a flue gas mixing box (1), and a connecting box (2) is communicated with the front bottom of the flue gas mixing box (1); a catalyst (3) is arranged between the flue gas mixing box (1) and the connecting box (2), and the catalyst (3) is subpackaged in the frame; a detection mechanism is arranged in the connecting box (2) and is used for detecting whether the flue gas entering the connecting box (2) contains nitrogen oxides or not; the bottom of the flue gas mixing box (1) is provided with a replacement mechanism, and the replacement mechanism is used for automatically completing the replacement of the catalyst (3) under the condition that the flue gas does not need to be stopped from being fed when the detection mechanism detects that the flue gas contains nitrogen oxides;
the replacing mechanism comprises a shell (17), and the shell (17) is sleeved at the bottom of the flue gas mixing box (1); the shell (17) and the flue gas mixing box (1) are both cylindrical, and the shell (17) is fixedly connected with the flue gas mixing box (1); the shell (17) is fixedly connected with the connecting box (2), a first belt pulley (18) is arranged above the shell (17), the first belt pulley (18) is annular, three push rods (19) are uniformly and fixedly connected to the bottom end of the first belt pulley (18), the three push rods (19) are distributed on the first belt pulley (18) in a circumferential array, and the push rods (19) are positioned between the two catalysts (3) and are attached to the two catalysts (3); the first belt pulley (18) is attached to the shell (17) and is rotationally connected with the smoke mixing box (1); the catalyst (3) is positioned between the shell (17) and the flue gas mixing box (1) and is attached to the shell (17) and the flue gas mixing box (1), and three catalysts (3) are arranged in the shell (17); a sealing door (20) is arranged at the right side of the shell (17), and the sealing door (20) is in sealing fit with the shell (17) and is in rotary connection with the shell (17); the shell (17) is provided with a driving mechanism which is used for driving three catalysts (3) in the shell (17) to simultaneously rotate anticlockwise by one hundred twenty degrees and driving the sealing door (20) to rotate downwards by ninety degrees after the three catalysts (3) rotate by one hundred twenty degrees;
the driving mechanism comprises a second motor (21), the second motor (21) is fixedly connected with the smoke mixing box (1), the bottom end of an output shaft of the second motor (21) is fixedly connected with a first threaded rod (22), and the bottom end of the first threaded rod (22) is fixedly connected with the smoke mixing box (1); the first threaded rod (22) is provided with self-locking performance, the first threaded rod (22) is in threaded connection with a lifting frame (23), the lifting frame (23) is in sliding connection with the flue gas mixing box (1), the bottom end of the lifting frame (23) is rotationally connected with a second threaded rod (24), and the second threaded rod (24) is not provided with self-locking performance; a second belt pulley (25) is rotatably connected to the bottom end position of the second threaded rod (24) on the shell (17), the second belt pulley (25) is in threaded connection with the second threaded rod (24), a belt (26) is arranged on the second belt pulley (25), and the belt (26) is meshed with the first belt pulley (18) and the second belt pulley (25) at the same time; the upper end part of the first threaded rod (22) and the bottom end part of the second belt pulley (25) are fixedly connected with a ratchet wheel (27), pawls (28) are meshed with the surface of the ratchet wheel (27), and the pawls (28) on the upper side and the lower side are fixedly connected with the lifting frame (23) and the shell (17) respectively; the driving directions of the ratchet wheels (27) at the upper side and the lower side are opposite; a rotating mechanism is arranged on the shell (17) and is used for driving the sealing door (20) to rotate downwards by ninety degrees when the second threaded rod (24) moves to the bottommost position;
the rotating mechanism comprises a pressing rod (29), and the pressing rod (29) is fixedly connected with the bottom end part of the second threaded rod (24); a second rotating rod (30) is fixedly connected to the sealing door (20) at the position of the connecting part with the shell (17), and the second rotating rod (30) is positioned right below the pressing rod (29); the second rotating rod (30) is sleeved with a torsion spring (31), one end of the torsion spring (31) is fixedly connected with the shell (17), and the other end of the torsion spring is fixedly connected with the second rotating rod (30).
2. The desulfurization and denitrification system for coked flue gas according to claim 1, wherein: the detection mechanism comprises a nitrogen oxide detector (4), and the nitrogen oxide detector (4) is positioned in the connecting box (2) and is fixedly connected with the connecting box (2); a connecting pipe (5) is arranged above the connecting box (2), and two ends of the connecting pipe (5) are respectively communicated with the connecting box (2) and the flue gas mixing box (1); the connecting pipe (5) is provided with an air extraction mechanism, and the air extraction mechanism is used for extracting the flue gas in the connecting box (2) into the flue gas mixing box (1).
3. The desulfurization and denitrification system for coked flue gas according to claim 2, wherein: the air extraction mechanism comprises a first motor (6), the first motor (6) is fixedly connected with a connecting pipe (5), the bottom end of an output shaft of the first motor (6) is fixedly connected with a fan blade (7), the fan blade (7) is positioned in the connecting pipe (5) and is rotationally connected with the connecting pipe (5), and the rotation of the fan blade (7) can extract the flue gas in the connecting box (2) into the flue gas mixing box (1); the front end of the connecting box (2) is provided with a first sealing mechanism which is used for sealing the connecting box (2); the connecting pipe (5) is provided with a second sealing mechanism, and the second sealing mechanism is used for sealing the connecting pipe (5).
4. A desulfurization and denitrification system for coked flue gas according to claim 3, wherein: the first sealing mechanism comprises a plurality of rotating plates (8), the rotating plates (8) are uniformly distributed at the front end opening position of the connecting box (2), and the rotating plates (8) are rotationally connected with the connecting box (2); the distance between the two rotating plates (8) is equal to the width of one rotating plate (8); the left side and the right side of the rotating plate (8) are symmetrically and fixedly connected with a first rotating rod (9); the left side and the right side of the connecting box (2) are symmetrically provided with driving rods (10), and the driving rods (10) are attached to each first rotating rod (9); the driving rod (10) is connected with a pull rod (11) in a sliding mode, a first spring (12) is sleeved on the pull rod (11), one end of the first spring (12) is fixedly connected with the pull rod (11), and the other end of the first spring is fixedly connected with the driving rod (10).
5. The desulfurization and denitrification system for coked flue gas according to claim 4, wherein: the second sealing mechanism comprises a sealing frame (13), and the sealing frame (13) is fixedly connected with the connecting pipe (5) and the flue gas mixing box (1); a sealing plate (14) is connected in a sliding manner in the sealing frame (13), a driving frame (15) is fixedly connected to the sealing plate (14), and the driving frame (15) is fixedly connected with pull rods (11) on the left side and the right side; the left side and the right side of the connecting box (2) are symmetrically and fixedly connected with first hydraulic cylinders (16), and the telescopic ends of the first hydraulic cylinders (16) are fixedly connected with a driving frame (15).
6. The desulfurization and denitrification system for coked flue gas according to claim 5, wherein: the flue gas mixing box (1) is characterized in that fixing frames (32) are symmetrically and fixedly connected to the left side and the right side of the flue gas mixing box, a second hydraulic cylinder (33) is fixedly connected to the fixing frames (32), an extrusion frame (34) is connected to the fixing frames (32) in a sliding mode, and the extrusion frame (34) is fixedly connected with the telescopic ends of the second hydraulic cylinders (33); the extrusion frame (34) is attached to the lifting frame (23), a second spring (35) is fixedly connected to the extrusion frame (34), and the other end of the second spring (35) is fixedly connected with the fixing frame (32); an oil pipe (36) is arranged between the first hydraulic cylinder (16) and the second hydraulic cylinder (33), and two ends of the oil pipe (36) are respectively communicated with the first hydraulic cylinder (16) and the second hydraulic cylinder (33); the first hydraulic cylinder (16), the second hydraulic cylinder (33) and the oil pipe (36) are filled with hydraulic oil.
7. A desulfurization and denitrification process for coked flue gas, which is applicable to the desulfurization and denitrification system for coked flue gas according to any one of claims 1-6, and is characterized in that: the specific steps of the process are as follows:
step one: introducing high-temperature flue gas into a flue gas mixing box (1) to be mixed with ammonia;
step two: the mixed flue gas and ammonia are catalyzed by a catalyst (3) and then are subjected to nitrogen oxide removal, and enter a connecting box (2);
step three: after the detection mechanism detects that the activity of the catalyst (3) disappears, the replacement mechanism is driven to operate;
step four: the replacement mechanism automatically completes the replacement of the catalyst (3) under the condition that the flue gas is not stopped from being introduced into the flue gas mixing box (1).
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