CN209809898U

CN209809898U - SCR reactor

Info

Publication number: CN209809898U
Application number: CN201920361551.9U
Authority: CN
Inventors: 袁世伟; 朱建华
Original assignee: Hangzhou Zhixing Thermoelectric Co Ltd
Current assignee: Hangzhou Zhixing Thermoelectric Co Ltd
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2019-12-20
Anticipated expiration: 2029-03-20

Abstract

The utility model relates to a purify poisonous flue gas field, specifically be a SCR reactor, an SCR reactor, which comprises a housin, a support for supporting the casing, connect in intake pipe and the shower head of casing upper end, install in shells inner wall and open the catalyst layer that has a plurality of through-holes, connect in the outlet duct of casing lower extreme, install in the air exhauster of outlet duct, the catalyst layer top is equipped with the cleaning device who is used for clearing up the through-hole, cleaning device includes along vertical direction sliding connection in the clearance frame of casing, install in a plurality of clearance needles that clearance frame just correspond with the through-hole, a actuating mechanism for driving clearance frame motion, be equipped with dust collector on the outlet duct. The driving mechanism drives the cleaning frame to move towards the through hole along the vertical direction until the cleaning needle penetrates through the through hole, and the blockage in the through hole is pushed out of the through hole. The plug separated from the through hole flows out of the shell from the liquid discharge pipe, and the service life is prolonged.

Description

SCR reactor

Technical Field

The utility model relates to a purify poisonous flue gas field, concretely relates to SCR reactor.

Background

After the coal of the thermal power plant is fired, flue gas can be generated, a large amount of SOX and NOX can be contained in the flue gas, if the flue gas is directly discharged without being treated, air pollution can be caused, and the flue gas is not beneficial to environmental protection. Generally, when a thermal power plant is used for treating flue gas containing a large amount of nitrogen oxides and sulfides, devices such as an SNCR denitration device, an SCR denitration device, a desulfurization device and the like are used for treating the flue gas together, so that the content of the nitrogen oxides and the sulfides in the flue gas is reduced, the flue gas reaches the emission standard, and the sustainable development is facilitated. And SCR denitration is the most common means in denitration treatment. The technical principle of the SCR is as follows: under the action of a catalyst, ammonia is sprayed into the flue gas with the temperature of about 280-420 ℃, and thenReduction of O to N₂And H₂O。

Due to the presence of the SCR catalyst, part of the SO2 in the flue gas will be oxidized to SO3, which will undergo a side reaction with ammonia to form NH4HSO 4. The temperature in the SCR device fluctuates somewhat, and especially when the outside temperature is low in winter, the temperature in the SCR device is more likely to be as low as 200 ℃. The NH4HSO4 is generally in a liquid state at 146-207 ℃, and the liquid NH4HSO4 can adhere to the surface of the catalyst and wrap the fly ash in the flue gas, so that the fly ash is solidified on the catalyst, the blockage of the catalyst hole is caused, and the service life of the SCR device is reduced.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a SCR reactor can clear up the plug on catalyst layer, prolongs the life of SCR device.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a SCR reactor, which comprises a housin, a support for supporting the casing, connect intake pipe and the shower head in the casing upper end, install in shells inner wall and open the catalyst layer that has a plurality of through-holes, connect in the outlet duct of casing lower extreme, install in the air exhauster of outlet duct, the catalyst layer top is equipped with the cleaning device who is used for clearing up the through-hole, cleaning device includes along vertical direction sliding connection in the clearance frame of casing, install in a plurality of clearance needles that clearance frame just corresponds with the through-hole, a actuating mechanism for driving clearance frame motion, be equipped with dust collector on the outlet duct.

By adopting the technical scheme, when sulfides and nitrated compounds in the flue gas are filtered, the flue gas enters the shell from the air inlet pipe, and after being mixed with vaporous ammonia sprayed from the spray header at the upper end of the shell to become mixed gas, the mixed gas moves downwards under the action of the exhaust fan and is subjected to reduction reaction through the catalyst layer.

When the through holes of the catalyst layer are cleaned, the driving mechanism drives the cleaning frame to move towards the direction of the through holes along the vertical direction until the cleaning needle penetrates through the through holes, and the blockage in the through holes is pushed out of the through holes. And the blockage separated from the through hole is removed by the dust removal device along with the gas in the shell under the action of the exhaust fan.

The utility model discloses a further set up to: the driving mechanism comprises a moving cylinder, a threaded rod and a driving assembly, wherein the moving cylinder is fixed on the cleaning frame and deviates from one surface of the cleaning needle, the threaded rod penetrates through the moving cylinder and is connected with the moving cylinder in a threaded mode, the driving assembly is used for driving the threaded rod to rotate, and the threaded rod is axially fixed and is connected to the shell in a circumferential rotating mode.

Through adopting above-mentioned technical scheme, because the clearance frame moves along vertical direction, so be fixed in the removal section of thick bamboo of clearance frame and only move along vertical direction, after drive assembly drive screw rotates, remove a section of thick bamboo and drive clearance frame and move along vertical direction.

The utility model discloses a further set up to: the inner wall of the shell is fixed with a guide rod arranged along the vertical direction, and the guide rod penetrates through the cleaning frame.

Through adopting above-mentioned technical scheme, because the clearance frame is worn to locate by the guide rod, and the guide rod sets up along vertical direction, so the clearance frame slides on the guide rod along vertical direction, so, the slip of vertical direction can only be done to the clearance frame, can not rotate.

The utility model discloses a further set up to: the driving assembly comprises a driven bevel gear fixed at one end of the screw rod, a driving bevel gear meshed with the driven bevel gear and used for driving a driving piece for driving the driving bevel gear to rotate, and the driving bevel gear is axially fixed and is connected to the shell in a circumferential rotating mode.

By adopting the technical scheme, the driving piece drives the driving bevel gear to rotate, and the driven bevel gear meshed with the driving bevel gear rotates. And then the screw fixed on the driven bevel gear is driven to rotate.

The utility model discloses a further set up to: and a corrosion-resistant shielding plate used for shielding the driving bevel gear and the driven bevel gear is arranged on the inner wall of the shell.

By adopting the technical scheme, the flue gas contains acidic gas, and the ammonia water is alkaline, so the baffle plate is additionally arranged to prevent the gas from directly contacting with the driving bevel gear of the driven bevel gear, and the service life of the gas and the service life of the driving bevel gear are prolonged.

The utility model discloses a further set up to: the cleaning frame comprises a sliding frame which is connected with the shell in a sliding mode in the vertical direction, and a plurality of warp and weft strips which are installed on the sliding frame and arranged in a crossed mode, the warp strips and the weft strips are projected into the sliding frame, and the cleaning needles are installed on the warp strips and the weft strips.

Through adopting above-mentioned technical scheme, mist passes the clearance frame from the clearance between longitude and latitude strip and the slide frame, can guarantee mist's circulation in the at utmost, and shared space is little. Meanwhile, the mixed gas can be uniformly distributed, so that the mixed gas passing through the gap uniformly enters the catalyst layer.

The utility model discloses a further set up to: the guide rods are arranged at two ends of the sliding frame along the maximum length direction of the sliding frame respectively.

By adopting the technical scheme, a straight line is determined according to two points, and the two guide rods arranged at the two ends of the sliding frame in the maximum length direction enable the sliding frame to slide more stably compared with the case that only one guide rod is arranged, namely, the two ends of the sliding frame are kept synchronous.

The utility model discloses a further set up to: the dust removing device comprises an ash bucket connected with the air outlet pipe, a baffle fixed on the inner wall of the air outlet pipe above the ash bucket, and an ash discharging valve arranged at the lower end of the ash bucket, wherein the sectional area of the ash bucket is gradually reduced downwards along the vertical direction.

By adopting the technical scheme, because the impurities and the gas have different inertia forces in the movement, the baffle is arranged in front of the dust-containing gas flow, so that the direction of the gas flow is changed rapidly. At this time, the dust particles are separated from the gas flow and discharged after the gas obtained by purification changes its direction sharply because the inertia force is much larger than that of the gas. The flow velocity of the gas containing the sediment is reduced when the gas flows through the enlarged cross section, the solid with large particles is firstly settled when the gas containing the sediment collides with the baffle, and the solid with small particles is settled in the next ash bucket.

To sum up, the utility model discloses a beneficial technological effect does: the driving mechanism drives the cleaning frame to move towards the through hole along the vertical direction until the cleaning needle penetrates through the through hole, and the blockage in the through hole is pushed out of the through hole. The plug separated from the through hole flows out of the shell from the liquid discharge pipe, and the service life is prolonged.

Drawings

Fig. 1 is a longitudinal sectional view of the present invention;

fig. 2 is a cross-sectional view of the cleaning frame of the present invention.

Reference numerals: 1. a housing; 11. a support; 12. a shielding plate; 2. an air inlet pipe; 3. a shower head; 4. a catalyst layer; 41. a through hole; 5. a cleaning device; 51. cleaning the rack; 511. a sliding frame; 512. warp and weft strips; 52. cleaning the needle; 53. a drive mechanism; 531. moving the drum; 532. a screw; 54. a guide rod; 6. an air outlet pipe; 7. an exhaust fan; 8. a dust removal device; 81. an ash hopper; 82. a baffle plate; 83. an ash discharge valve; 9. a fixing assembly; 91. a fixed block; 10. a drive assembly; 101. a driven bevel gear; 102. a drive bevel gear; 103. a drive member; 1031. a rotating shaft; 1032. a rocker.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, an SCR reactor includes a housing 1, a support 11 for supporting the housing, an air inlet pipe 2 and a shower head 3 connected to the upper end of the housing 1, a catalyst layer 4 installed on the inner wall of the housing 1 and having a plurality of through holes 41, a cleaning device 5 installed above the catalyst layer 4, an air outlet pipe 6 connected to the lower end of the housing 1, an exhaust fan 7 installed on the air outlet pipe 6, and a dust removing device 8.

When sulfide and nitride in the flue gas are filtered, the flue gas enters the shell 1 from the air inlet pipe 2, is mixed with the vaporous ammonia sprayed from the spray header 3 at the upper end of the shell 1 to form mixed gas, and then moves downwards under the action of the exhaust fan 7 to perform reduction reaction through the catalyst layer 4.

As shown in fig. 1 and 2, the cleaning device 5 includes a cleaning frame 51 slidably connected to the housing 1 in the vertical direction, a plurality of cleaning pins 52 mounted on the cleaning frame 51 and corresponding to the through holes 41, and a driving mechanism 53 for driving the cleaning frame 51 to move. The cleaning frame 51 includes a sliding frame 511 slidably connected to the housing 1 along the vertical direction, and a plurality of crosswise bars 512 mounted on the sliding frame 511 and arranged in a crossed manner, wherein the crosswise bars 512 are projected in the sliding frame 511. The clearing needle 52 is mounted at the position where the two warp and weft threads 512 intersect. Two sets of symmetrically arranged fixing components 9 are fixed on the inner wall of the shell 1 at the two ends of the sliding frame 511 along the maximum length direction. The fixing assembly 9 includes two fixing blocks 91 fixed on the inner wall of the housing 1 and arranged at intervals. A guide rod 54 disposed in the vertical direction is fixed between the two fixing blocks 91. The guide rod 54 is inserted through the sliding frame 511. In this manner, the sliding frame 511 can move in the vertical direction.

As shown in fig. 1, the driving mechanism 53 includes a moving cylinder 531 fixed on a surface of the cleaning frame 51 away from the cleaning pin 52, a threaded rod 532 threaded through the moving cylinder 531 and screwed to the moving cylinder 531, and a driving assembly 10 for driving the threaded rod 532 to rotate, wherein the threaded rod 532 is axially fixed and circumferentially rotatably connected to the housing 1. The driving assembly 10 includes a driven bevel gear 101 fixed to one end of the screw 532, a drive bevel gear 102 engaged with the driven bevel gear 101, and a driving member 103 for driving the drive bevel gear 102 to rotate, wherein the drive bevel gear 102 is axially fixed and circumferentially rotatably connected to the housing 1. The driving member 103 includes a rotating shaft 1031 fixed to the drive bevel gear 102 and coaxial with the drive bevel gear 102, and a rocker 1032 fixed to an end of the rotating shaft 1031 penetrating through the housing 1. The rotation shaft 1031 is axially fixed and circumferentially rotatably connected to the housing 1. A corrosion-resistant shielding plate 12 for shielding the drive bevel gear 102 and the driven bevel gear 101 is installed on the inner wall of the housing 1.

The dust removing device 8 comprises an ash bucket 81 connected with the air outlet pipe 6, a baffle 82 fixed on the inner wall of the air outlet pipe 6 above the ash bucket 81 and an ash discharging valve 83 arranged at the lower end of the ash bucket 81, and the sectional area of the ash bucket 81 is gradually reduced downwards along the vertical direction. Due to the difference in inertia forces between the impurities and the gas during movement, the baffle 82 is disposed in front of the dusty gas stream, causing the direction of the gas stream to change abruptly. At this time, the dust particles are separated from the gas flow and discharged after the gas obtained by purification changes its direction sharply because the inertia force is much larger than that of the gas. The velocity of the settling gas through the enlarged cross-section decreases and the larger particles of solids settle first by colliding with the baffle 82 and the smaller particles settle in the next hopper 81.

The working principle is as follows: when the through holes 41 of the catalyst layer 4 are cleaned, the rocker 1032 rotates to drive the rotating shaft 1031 to rotate, so that the drive bevel gear 102 fixed with the rotating shaft 1031 rotates. The driven bevel gear 101 engaged with the drive bevel gear 102 rotates. And then drives the screw 532 fixed to the driven bevel gear 101 to rotate. Since the slide frame 511 is movable only in the vertical direction on the guide rod 54, the movable cylinder 531 fixed thereto is not rotatable and can move only in the vertical direction. Therefore, when the screw 532 rotates, the moving cylinder 531 screwed to the screw 532 moves down in the vertical direction. So that the cleaning pins 52 mounted to the sliding frame 511 are moved downward and pass through the through holes 41. The plug in the through hole 41 is pushed out of the through hole 41. The blockage separated from the through hole 41 is precipitated by the ash bucket 81 along with the air in the shell 1 under the action of the exhaust fan 7, and the blockage is removed. In this way, the cleaning work of the catalyst layer 4 is completed. In order to prolong the service life of the SCR reactor, parts in the shell 1 are made of anti-corrosion high-temperature resistant materials.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a SCR reactor, includes casing (1), support (11) that are used for supporting the casing, connects intake pipe (2) and shower head (3) in casing (1) upper end, installs in casing (1) inner wall and opens catalyst layer (4) that have a plurality of through-holes (41), connects in outlet duct (6) of casing (1) lower extreme, installs air exhauster (7) in outlet duct (6), characterized by: catalyst layer (4) top is equipped with cleaning device (5) that are used for clearing up through-hole (41), and cleaning device (5) include along vertical direction sliding connection in clearance frame (51) of casing (1), install in clearance frame (51) and a plurality of clearance needles (52) that correspond with through-hole (41), be used for driving actuating mechanism (53) of clearance frame (51) motion, are equipped with dust collector (8) on outlet duct (6).

2. An SCR reactor as claimed in claim 1, wherein: the driving mechanism (53) comprises a moving barrel (531) fixed on the cleaning frame (51) and deviating from one surface of the cleaning needle (52), a threaded rod (532) penetrating and connected with the moving barrel (531) in a threaded mode, and a driving assembly (10) used for driving the threaded rod (532) to rotate, wherein the threaded rod (532) is axially fixed and is connected to the shell (1) in a circumferential rotating mode.

3. An SCR reactor as claimed in claim 2, wherein: the inner wall of the shell (1) is fixed with a guide rod (54) arranged along the vertical direction, and the guide rod (54) penetrates through the cleaning frame (51).

4. An SCR reactor as claimed in claim 2, wherein: the driving assembly (10) comprises a driven bevel gear (101) fixed at one end of the screw (532), a driving bevel gear (102) meshed with the driven bevel gear (101) and a driving piece (103) used for driving the driving bevel gear (102) to rotate, and the driving bevel gear (102) is axially fixed and is connected to the shell (1) in a circumferential rotating mode.

5. An SCR reactor as claimed in claim 4, wherein: and a corrosion-resistant shielding plate (12) used for shielding the driving bevel gear (102) and the driven bevel gear (101) is arranged on the inner wall of the shell (1).

6. An SCR reactor as claimed in claim 3, wherein: the cleaning frame (51) comprises a sliding frame (511) connected with the shell (1) in a sliding mode along the vertical direction and a plurality of crosswise strips (512) arranged on the sliding frame (511) in a crossed mode, the crosswise strips (512) are projected into the sliding frame (511), and cleaning needles (52) are arranged on the crosswise strips (512).

7. An SCR reactor as claimed in claim 6, wherein: the number of the guide rods (54) is two, and the two guide rods (54) are respectively arranged at two ends of the sliding frame (511) along the maximum length direction of the sliding frame.

8. An SCR reactor as claimed in claim 1, wherein: the dust removal device (8) comprises an ash bucket (81) connected to the air outlet pipe (6), a baffle plate (82) fixed on the inner wall of the air outlet pipe (6) above the ash bucket (81), and an ash discharge valve (83) installed at the lower end of the ash bucket (81), wherein the sectional area of the ash bucket (81) is gradually reduced downwards along the vertical direction.