CN213885702U - SCR denitration intelligent soot blower of cement kiln - Google Patents
SCR denitration intelligent soot blower of cement kiln Download PDFInfo
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- CN213885702U CN213885702U CN202022548447.6U CN202022548447U CN213885702U CN 213885702 U CN213885702 U CN 213885702U CN 202022548447 U CN202022548447 U CN 202022548447U CN 213885702 U CN213885702 U CN 213885702U
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Abstract
The utility model provides a cement kiln SCR denitration intelligence soot blower. The invention adopts compressed air to strongly blow in the vertical direction, improves the soot blowing efficiency and the reliability and stability of a soot blowing system, has the technical characteristics of strong pertinence, wide coverage area, no dead angle in soot cleaning and the like, can also improve the service life of the catalyst, prolongs the replacement period of the catalyst, thereby improving the denitration efficiency and saving the operation cost.
Description
Technical Field
The utility model relates to a soot blowing system especially relates to a cement kiln SCR denitration intelligence soot blower.
Background
The SCR denitration process is the most effective method for realizing flue gas denitration in the power industry and the non-power industry at present, and is also a widely adopted process. However, in part of power industries, cement industries, steel industries, glass industries and other SCR inlet flue gases contain a large amount of dust, and meanwhile, in some industries, flue gases contain a large amount of alkali metals, and are easy to agglomerate on the surfaces of the SCR inlet flue gases when passing through the catalyst, so that bridging and blockage are formed, catalyst poisoning is caused, and denitration efficiency is greatly reduced.
One of the main reasons for deactivation of the denitration catalyst is the blockage problem of the SCR denitration catalyst, and in order to prevent ash accumulation on a catalyst layer and improve denitration efficiency, ash removal is the first step of regeneration of the denitration catalyst, and a soot blower needs to be arranged above each layer of catalyst.
The common soot blowers are a sound wave soot blower, a steam soot blower and a compressed air soot blower. In engineering practice, it is proved that several kinds of soot blowing are required to be combined for soot blowing, and meanwhile, the soot blowing structure needs to be upgraded and modified to achieve the soot blowing effect.
Disclosure of Invention
The utility model aims at solving the defects existing in the prior art and providing an intelligent ash blowing device for SCR denitration of a cement kiln.
In order to achieve the purpose, the invention adopts the following technical scheme:
an SCR denitration intelligent soot blower for a cement kiln comprises a compressed air system and a soot blower reactor; the device also comprises an auxiliary soot blowing system and a heat exchange system; the soot blower is a rake type soot blower; the compressed air system is connected with the heat exchange system through a pipeline and provides an air source for the soot blowing device; the heat exchange system is connected with the rake type soot blower, heats an air source provided by a compressed air system and is connected into the rake type soot blower through a pipeline; the rake type soot blower is arranged at the upper part of the reactor.
Preferably, the rake type soot blower comprises a rake type soot blower body, a rake dividing pipe, a main rake pipe, a nozzle, an outer pipe and a soot blower valve; the soot blower valve is arranged below the soot blower body and is connected with the soot blower body through a pipeline; the soot blower valve is connected with the outer pipe through a pipeline; the main rake pipe is embedded in the outer pipe; a plurality of branch harrow tubes are arranged on the main harrow tube; the rake dividing pipe is arranged on the main rake pipe in the middle; the nozzle is arranged at the lower part of the rake separating pipe.
Preferably, the nozzle is funnel-shaped; the front end of the nozzle is spherical; the height of the nozzle is 12-20 mm; the spray angle of the nozzle is 15 degrees; the front end of the nozzle is provided with a plurality of round nozzles.
Preferably, the device also comprises a cover body; the cover body is a single-opening type protective cover; the cover body is welded on the rake separating pipe and moves back and forth along with the rake separating pipe.
Preferably, the auxiliary soot blowing system comprises an air cannon; the air cannon is arranged at the lower left of the reactor.
Preferably, the compressed air system consists of an air compressor and a compressed air storage tank; the air compressor is connected with the compressed air storage tank through a pipeline; the air compressor machine all matches desiccator, tertiary filter and buffer tank.
Preferably, the reactor is a totally enclosed closed vessel; a conveying belt is arranged above the reactor; the outer tube moves back and forth along the conveyor belt.
Preferably, the novel SCR denitration catalyst soot blower further comprises a control system; the control system is mainly a control box frequency converter; and the control box frequency converter is connected with the body of the rake type soot blower.
Preferably, the sound wave soot blowers are arranged on two sides of the reactor; the sound wave soot blowers are respectively connected with a compressed air system.
The utility model also provides a cement kiln SCR denitration intelligence soot blower method. Compressed air is prepared by utilizing an air compressor and stored in a compressed air storage tank, and high-temperature flue gas can be obtained through a heat exchange system. The soot blower adopts a telescopic rake type soot blower. The main rake pipe of the rake type soot blower is connected with the lower part of the soot blower body through the upper end of the reactor shell, and the soot blowing element is a soot blowing rake and consists of a main rake pipe and a plurality of rake dividing pipes provided with a plurality of special nozzles. The gas flow emitted from the nozzle can clean the ash on the surface and in the hole of the catalyst. The upper end of a main rake pipe of the soot blowing rake is connected with an outer pipe, the outer pipe is driven by a transmission belt above a reactor shell to move, a control box frequency converter is installed on a rake type soot blower body, and the moving speed of the rake pipe of the soot blower is controlled mainly by controlling the rotating speed of a motor of the soot blower. The cover body is welded on the rake dividing pipe and moves back and forth along with the rake dividing pipe, so that accumulation of a large amount of dust can be prevented, and dust raising in the dust blowing process can also be prevented. The air cannon is mainly characterized in that dust accumulation occurs on the wall and the corners of the reactor, the air cannon can be started, high-pressure gas is generated instantly for purging, the starting time of the air cannon can be fixedly set, remote manual operation can be carried out according to the pressure difference of a catalyst layer, an online video monitoring system is arranged in the space above the shell of the reactor, 1-4 video recording devices are arranged at proper positions, the selection principle is that the space above the catalyst can be completely covered, and recorded videos are transmitted to a central control room in real time for monitoring.
Compared with the prior art, the invention has the beneficial effects that: the combined soot blowing mode of the acoustic soot blowing and the rake type soot blower is adopted, and high-temperature compressed air is used as a soot blowing medium, so that the service life and the replacement period of the catalyst can be prolonged, the denitration efficiency is improved, and the replacement cost is saved.
Because the dust content in the flue gas in the cement industry is high, the flue gas is accumulated on the surface of the catalyst for a long time to poison the catalyst and block the pores of the catalyst, so that the denitration efficiency is influenced; in addition, whether the dust is deposited on the surface of the catalyst can not be accurately judged only through the pressure difference of the catalyst layer, so that the specific dust deposition position and the number of the dust deposition layers can be observed in real time through an online video monitoring system, the problem of catalyst blockage can be effectively solved, meanwhile, the dust deposition condition on the surface of the catalyst is observed, the using amount of compressed air can be saved, and the operation cost is saved.
Drawings
FIG. 1 is a schematic diagram of an SCR denitration soot blowing system of a cement kiln;
FIG. 2 is a schematic view of a nozzle configuration;
FIG. 3 is a schematic top view of an SCR denitration soot blowing system of the cement kiln.
In the figure: 1. a rake type soot blower body; 2. a control box frequency converter; 3. a rake separating pipe; 4. a main rake pipe; 5. a nozzle; 6. a sootblower valve; 7. an outer tube; 8. a cover body; 9. an air cannon; 10. a reactor; 11. a compressed air system; 12. a heat exchange system; 13. a conveyor belt; 14. an online video monitoring system; 15. a sound wave soot blower.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Please refer to fig. 1 and fig. 2 in combination, the utility model provides a cement kiln SCR denitration intelligence soot blower, including compressed air system, soot blower reactor, the device still includes supplementary soot blowing system and heat transfer system.
The soot blower is a rake type soot blower; the compressed air system is connected with the heat exchange system through a pipeline and provides an air source for the soot blowing device; the heat exchange system is connected with the rake type soot blower, heats an air source provided by a compressed air system and is connected into the rake type soot blower through a pipeline; the rake type soot blower is arranged at the upper part of the reactor.
The compressed air system compresses air, and can generate larger air pressure, so that the air blown out by the soot blower has larger wind power, and the blowing effect is better.
Compressed air is behind heat exchange system, and the wind that the soot blower blew off is dry hot-blast, can not only dry the dust on catalyst converter surface, and it is effectual to sweep, can prevent especially that the dust from meeting water and condensing on catalyst converter surface. The service life and the replacement period of the catalyst can be prolonged.
Furthermore, the rake type soot blower is rake-shaped, can cover the surface of the catalyst in a large area, and has good blowing effect.
Preferably, the rake type soot blower comprises a rake type soot blower body 1, a rake dividing pipe 3, a main rake pipe 4, a nozzle 5, an outer pipe 7 and a soot blower valve 6; the soot blower valve 6 is arranged below the soot blower body 1 and is connected with the soot blower body 1 through a pipeline; the soot blower valve 6 is connected with the outer pipe 7 through a pipeline; the main harrow pipe 4 is embedded in the outer pipe 7; a plurality of branch harrow tubes 3 are arranged on the main harrow tube 4; the rake dividing pipe 3 is arranged on the main rake pipe 4 in the middle; the nozzle 5 is arranged at the lower part of the rake dividing pipe 3.
The main rake pipe 4 is provided with a plurality of rake dividing pipes 3, air in the main rake pipe 4 enters the rake dividing pipes 3, and then the surface of the catalyst is swept through the rake dividing pipes 3, so that the sweeping area is increased.
Further, parallel arrangement divides the harrow pipe 3 on same root owner harrow pipe 4, and the branch harrow pipe 3 that sets up on two adjacent owner harrow pipes 4 all on same straight line, and this structure sets up, divides the harrow pipe when sweeping catalyst surface for the dust can be towards same direction, prevents that the dust from dividing the gap between the harrow pipe backward flow between the two adjacent, reduces and cleans the effect.
Preferably, as shown in fig. 2, the nozzle 5 is funnel-shaped, and the front end of the nozzle is spherical; the height of the nozzle 5 is 12-20 mm; the spray angle of the nozzle is 15-80 degrees, such as 15 degrees, 45 degrees, 60 degrees, preferably 45 degrees; the front end of the nozzle 5 is provided with a plurality of round nozzles.
Set up certain contained angle between with nozzle and the catalyst surface, on the one hand produce certain power of blowing on the dust surface, blow up the dust, on the other hand still produces certain power of sweeping to the dust that blows up for the dust is towards a direction, more is favorable to cleaning.
The spherical nozzle 5 is adopted, and the plurality of circular nozzles are arranged at the front end of the nozzle 5, so that more spraying directions can be selected, incomplete dust removal caused by nozzle blockage in one direction can be avoided, and the dust removal efficiency is effectively improved.
Preferably, a cover 8 is also included; the cover body 8 is a single-opening type protective cover; the cover body 8 is welded on the rake dividing pipe 3 and moves back and forth along with the rake dividing pipe 3.
The cover body 8 can effectively avoid dust raising in the dust blowing process, and the rake dividing pipe 3 avoids the accumulation of a large amount of dust layers in the moving process; further, the cover body 8 ensures that the wind blown out from the rake dividing pipe 3 is directed to the surface of the catalyst, and prevents dust from falling on the rake dividing pipe 3, thereby preventing dust from being accumulated on the surface of the rake dividing pipe 3 and even blocking the nozzle 5.
Preferably, the auxiliary soot blowing system comprises an air cannon 9; the air cannon 9 is arranged at the lower left of the reactor 10; the air cannon 9 can avoid dust accumulation on the wall and the corner of the reactor; the air cannon 9 can scatter the dust on the wall and the right angle of the reactor, so as to prevent a large amount of dust from accumulating after long-term operation. In addition, dust or ash lumps which are condensed or agglomerated on the surface of the catalyst can be broken up.
Preferably, the compressed air system 11 is composed of an air compressor and a compressed air storage tank; the air compressor is connected with the compressed air storage tank through a pipeline; the air compressor machine all matches desiccator, tertiary filter and buffer tank.
The dryer dries the compressed air, so that dry wind energy prevents dust from condensing and the blowing effect is better. The three-stage filter purifies air, can prevent that compressed air contains dust, dander, hair, grains of sand etc. and influences the effect of sweeping, also can prevent the destructive effect of grains of sand etc. to catalyst surface.
Preferably, the dryer is a micro-thermal adsorption dryer, and is matched with an exhaust hood and an exhaust pipeline. The outlet of the air compressor is smaller than the buffer tank, and the volume of the air compressor is not more than 6m3(ii) a The compressed air storage tank is mainly used for storing air generated by the air compressor, the design pressure of the air compressor is 1.0MPa, and the air consumption quality of the rake type soot blower are guaranteed.
Preferably, the heat exchange system 12 is used for heating the compressed air, and the temperature of the heated compressed air is not lower than 220 ℃ nor higher than 380 ℃, so that the cold air or the high-temperature air is prevented from directly impacting the catalyst, and the service life of the catalyst is prolonged.
Preferably, as shown in FIG. 3, the reactor 10 is a fully enclosed, closed vessel; a conveying belt 13 is arranged above the reactor 10; the outer tube 7 is moved back and forth along a conveyor belt 13.
The arrangement of the transmission belt 13 enables the soot blower to move, and further enables the nozzle 5 to move, so that the blowing effect is enhanced.
Preferably, the novel SCR denitration catalyst soot blower further comprises a control system; the control system is mainly a control box frequency converter 2; and the control box frequency converter 2 is connected with the body 1 of the rake type soot blower.
The control box frequency converter 2 realizes the back and forth movement of the body 1 of the rake type soot blower, and the frequency converter controls the movement speed of the rake pipe and can also adjust the pressure difference of the catalyst layer according to the ash content in the flue gas; and the soot blowing time and the soot blowing frequency are also controlled, so that the automation and the intellectualization of soot blowing are realized.
Better, the unchangeable condition of harrow pipe functioning speed among the traditional soot blower is solved to control box converter 2, carries out frequency conversion according to the ash volume size and adjusts, can effectively improve and blow grey effect and soot blowing efficiency.
Preferably, the acoustic soot blower 15 is arranged at two sides of the reactor 10; the acoustic wave soot blowers 15 are respectively connected with the compressed air system 11.
The acoustic wave soot blowers 15 are arranged on two sides of the reactor 10, and can be arranged on one side or two sides, so that accumulated dust is lifted again, the dust is prevented from being accumulated for a long time to block the soot blowers, the auxiliary rake type soot blowers are used, and the effect is better.
The utility model also provides a cement kiln SCR denitration intelligence soot blowing method, including following step:
step S1, preparing compressed air by using an air compressor and storing the compressed air in a compressed air storage tank; before the air compressor is used for preparing compressed air, the air passes through a filtering and drying machine, and pure and dry air is prepared into the compressed air through the air compressor.
And step S2, heating and drying the compressed air through a heat exchange system through a pipeline to obtain dry compressed hot air.
Step S3, blowing the surface of the catalyst by dry compressed air through a rake type soot blower body, a main rake pipe, a rake dividing pipe and a nozzle;
under the action of a conveying belt, the soot blower body, the main rake pipe, the rake dividing pipe and the nozzle sweep the surface of the catalyst in a reciprocating manner;
under the action of a frequency converter of the control box, the moving speed of the harrow tube is controlled; the pressure difference of the catalyst layer is adjusted according to the ash content in the flue gas; soot blowing time and soot blowing frequency are also controlled, and automation and intellectualization of soot blowing are realized;
meanwhile, the acoustic wave soot blower is matched with the rake type soot blower to synchronously perform soot blowing work, and high-temperature compressed air is used as a soot blowing medium, so that the service life and the replacement period of the catalyst can be prolonged, the denitration efficiency is improved, and the replacement cost is saved;
when the online video monitoring system works, the selection principle of the online video monitoring system is that the space above the catalyst can be completely covered, and recorded videos are transmitted to a central control room in real time for monitoring.
And step S4, according to the purging effect, starting an air cannon to smash and purge the dust accumulated on the wall and the corners of the reactor and the dust blocks condensed on the surface of the catalyst.
And step S5, the step S3 is carried out again until the surface of the catalyst is cleaned or the expected purging effect is achieved.
Further, the compressed air is prepared by the air compressor and stored in the compressed air storage tank, the temperature of the flue gas of the heat exchange system can be reduced through the heat exchange system, the compressed air can be heated, and the effect of comprehensive utilization of energy is achieved. The soot blower adopts a telescopic rake type soot blower. The main rake pipe of the rake type soot blower is connected with the lower part of the soot blower body through the upper end of the reactor, and the soot blowing element is a soot blowing rake and consists of a main rake pipe and a plurality of rake dividing pipes provided with a plurality of special nozzles. The gas flow emitted from the nozzle can clean the ash on the surface and in the hole of the catalyst. The upper end of a main rake pipe of the soot blowing rake is connected with an outer pipe, the outer pipe is driven by a transmission belt above the reactor to move, and a soot blower valve supplies a blowing medium to the main rake pipe through a fixed inner pipe. The control box frequency converter is installed on the rake type soot blower body, and the moving speed of a rake pipe of the soot blower is controlled mainly by controlling the rotating speed of a motor of the soot blower. The cover body is welded on the rake dividing pipe and moves back and forth along with the rake dividing pipe, so that accumulation of a large amount of dust can be prevented, and dust raising in the dust blowing process can also be prevented. And the air bubble mainly is that the condition that dust is piled up appears in reactor wall and corner, can start the air bubble, produces high-pressure gas in the twinkling of an eye and sweeps, and the time that the air bubble started can fixed set up, also can carry out long-range manual operation according to the pressure differential on catalyst layer. The online video monitoring system 14 is arranged in the upper space of the reactor shell, 1-4 video recording devices are arranged at proper positions, the selection principle is that the upper space of the catalyst can be completely covered, and recorded videos are transmitted to a central control room in real time for monitoring.
The present invention has been described in relation to the above embodiments, which are only examples for carrying out the invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (10)
1. The utility model provides a cement kiln SCR denitration intelligence soot blower, includes compressed air system, soot blower reactor, its characterized in that: the device also comprises an auxiliary soot blowing system and a heat exchange system; the soot blower is a rake type soot blower and a sound wave soot blower; the compressed air system is connected with the heat exchange system through a pipeline and provides an air source for the soot blowing device; the heat exchange system is connected with the rake type soot blower, heats an air source provided by a compressed air system and is connected into the rake type soot blower through a pipeline; the rake type soot blower is arranged at the upper part of the reactor; the acoustic soot blowers are arranged on two sides of the reactor.
2. The cement kiln SCR denitration intelligent soot blower of claim 1, characterized in that: the rake type soot blower comprises a rake type soot blower body (1), rake dividing pipes (3), a main rake pipe (4), a nozzle (5), an outer pipe (7) and a soot blower valve (6); the soot blower valve (6) is arranged below the soot blower body (1) and is connected with the soot blower body (1) through a pipeline; the soot blower valve (6) is connected with the outer pipe (7) through a pipeline; the main harrow pipe (4) is embedded in the outer pipe (7); a plurality of branch harrow pipes (3) are arranged on the main harrow pipe (4); the rake dividing pipe (3) is arranged on the main rake pipe (4) in the middle; the nozzle (5) is arranged at the lower part of the rake dividing pipe (3).
3. The cement kiln SCR denitration intelligent soot blower of claim 2, characterized in that: the nozzle (5) is funnel-shaped; the front end of the nozzle (5) is spherical; the height of the nozzle (5) is 12-20 mm; the spray angle of the nozzle (5) is 15 degrees; the front end of the nozzle (5) is provided with a plurality of round nozzles.
4. The cement kiln SCR denitration intelligent soot blower of claim 1, characterized in that: also comprises a cover body (8); the cover body (8) is a single-opening type protective cover; the cover body (8) is welded on the rake dividing pipe (3) and moves back and forth along with the rake dividing pipe (3).
5. The cement kiln SCR denitration intelligent soot blower of claim 1, characterized in that: the auxiliary soot blowing system comprises an air cannon (9); the air cannon (9) is arranged at the lower left of the reactor (10).
6. The cement kiln SCR denitration intelligent soot blower of claim 1, characterized in that: the compressed air system (11) consists of an air compressor and a compressed air storage tank; the air compressor is connected with the compressed air storage tank through a pipeline; the air compressor machine all matches desiccator, tertiary filter and buffer tank.
7. The cement kiln SCR denitration intelligent soot blower of claim 5, characterized in that: the reactor (10) is a totally-enclosed closed container; a conveying belt (13) is arranged above the reactor (10); the outer tube (7) moves back and forth along the conveyor belt (13).
8. The cement kiln SCR denitration intelligent soot blower of claim 1, characterized in that: the cement kiln SCR denitration catalyst soot blowing device also comprises a control system; the control system is mainly a control box frequency converter (2); and the control box frequency converter (2) is connected with the body (1) of the rake type soot blower.
9. The cement kiln SCR denitration intelligent soot blower of claim 1, characterized in that: the SCR denitration intelligent soot blower for the cement kiln further comprises an online video monitoring system (14); the online video surveillance system (14) comprises a plurality of online video surveillance devices; the online video monitoring equipment is arranged on the reactor (10) and is connected through a VGA connecting line.
10. The cement kiln SCR denitration intelligent soot blower of claim 1, characterized in that: the acoustic soot blowers (15) are arranged at two sides of the reactor (10); the sound wave soot blowers (15) are respectively connected with the compressed air system (11).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115518695A (en) * | 2022-08-18 | 2022-12-27 | 国能龙源环保有限公司 | Catalyst module ash removal chamber and catalyst module ash removal system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115518695A (en) * | 2022-08-18 | 2022-12-27 | 国能龙源环保有限公司 | Catalyst module ash removal chamber and catalyst module ash removal system |
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Address after: 224051 innovation center, 42 environmental protection Avenue, environmental protection science and Technology City, Tinghu District, Yancheng City, Jiangsu Province Patentee after: Jiangsu Kunlun Internet Technology Co.,Ltd. Address before: 224051 innovation center, 42 environmental protection Avenue, environmental protection science and Technology City, Tinghu District, Yancheng City, Jiangsu Province Patentee before: Kunyue Internet Environmental Technology (Jiangsu) Co.,Ltd. |
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