CN212167060U - Soot blower suitable for SCR denitration of high-temperature and high-dust flue gas - Google Patents
Soot blower suitable for SCR denitration of high-temperature and high-dust flue gas Download PDFInfo
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- CN212167060U CN212167060U CN202020613285.7U CN202020613285U CN212167060U CN 212167060 U CN212167060 U CN 212167060U CN 202020613285 U CN202020613285 U CN 202020613285U CN 212167060 U CN212167060 U CN 212167060U
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Abstract
The utility model provides a soot blower for denitration of high temperature high dust flue gas SCR, including the air feed unit, control air valve unit, the gas transmission house steward, the nozzle unit, the air feed unit is through the one end sealing connection of control air valve unit and gas transmission house steward, has seted up the gas transmission branch pipe in one side of gas transmission house steward, and nozzle unit fixed connection is on the gas transmission branch pipe, wherein, the nozzle unit is flat structure, the utility model discloses an adopt flat spout's setting for jetting area and effective action are bigger than traditional circular orifice, and the jetting dynamics in the cover area is even, can prevent effectively that local atress is too big, and the catalyst top layer damages, the utility model discloses install in the avris of the top certain distance on catalyst top layer, can effectually solve the problem in traditional soot blower jetting blind spot, solve local deposition and jam problem.
Description
Technical Field
The utility model relates to an environmental protection technology field especially relates to a be applicable to high temperature high dirt flue gas soot blower for SCR denitration.
Background
As the emission standard of atmospheric pollutants in the cement industry becomes stricter, the emission limit of nitrogen oxides in flue gas at the tail of a cement kiln and the kiln approaches the ultralow emission limit in the thermal power industry. The cement kiln tail gas nitrogen oxide treatment adopts SCR technology, which can stably meet the strictest emission requirements. The SCR is that a catalytic reactor is arranged at the outlet of a preheater of the cement kiln, a reducing agent (such as ammonia water or urea) is sprayed in front of the reactor, and nitrogen oxides in flue gas are reduced into nitrogen and water under the action of a catalyst at a proper temperature (300-400 ℃). The mode does not need reheating and consumes a large amount of energy, but the smoke gas is 60-120g/m3The dust of (2). A high-dust SCR reactor in the traditional thermal power field is provided with a sound wave soot blower and a steam rake type soot blower, but the two modes are not suitable due to the special property of dust in cement flue gas.
From the development situation of the current SCR technology, the compressed air is the most ideal power source for blowing the soot by the high-dust flue gas catalyst. However, the use of compressed air to purge large cross-section, highly dusty catalyst surfaces has to overcome a number of technical problems. Chinese patent "a pipe network type SCR denitration catalyst hot air soot blowing system and operation method" (CN109513353A) discloses a method for sound wave soot blowing combined application by adopting high-pressure steam soot blowing and compressed air as power sources, and the form is not suitable for denitration and soot cleaning of tail flue gas of a cement kiln.
Chinese patent soot blower for glass kiln, cement kiln and coke oven flue gas denitration SCR device (CN209378802U) discloses a soot cleaning device which adopts compressed air as a power source and is provided with a soot blowing pipe on a bracket capable of rotating 360 degrees, and the rotating part of the device has the risk of unstable operation under the conditions of high temperature and high dust flue gas.
Chinese patent "an active impulse type compressed air soot blower" (CN105478009A) discloses a soot blowing form that uses compressed air as a power source and a rake type pipe network is matched with a plurality of blowing components, but when dealing with a larger soot cleaning area, the compressed air is consumed suddenly, and the vertical blowing has a larger influence on the surface of a catalyst.
Chinese patent "multiple single hole co-pressure shock wave soot blower" (CN207230581U) discloses a device for removing accumulated dust by using a round hole as a shock wave emission hole. The blowing coverage range of the circular spray holes is very limited, and the coverage area is limited due to the limited angle, so that ash cleaning dead corners exist.
Chinese patent 'a soot blower' (CN101846325B) discloses a soot blower which can solve dead corners of a soot blowing area, but still needs to rotate by a motor driving part, and has unstable operation risk.
Chinese patent sootblower nozzle assembly with improved downstream nozzles (1375657a) discloses a jet stack assembly that reduces flow disturbances, but is still circular in nature with coverage angles with blowing dead zones.
In conclusion, the discovery and development of the soot blower which can really solve the SCR denitration under the condition of high-temperature and high-dust flue gas at the tail of the cement kiln and has simple structure and reliable process have important significance.
SUMMERY OF THE UTILITY MODEL
The utility model provides a be applicable to high temperature high dust flue gas soot blower for SCR denitration, specific technical scheme is:
the air supply unit is hermetically connected with one end of the air transmission main pipe through the control air valve unit, one side of the air transmission main pipe is provided with an air transmission branch pipe, and the nozzle unit is fixedly connected to the air transmission branch pipe, wherein the nozzle unit is of a flat structure;
further, the air supply unit is a compressed air bag;
further, the control air valve unit is an on-off electromagnetic valve;
furthermore, n gas transmission branch pipes are arranged on the gas transmission main pipe, wherein n is more than 1;
furthermore, the nozzle unit comprises a gas transmission connecting pipe, a flat nozzle and an air flow separation inner core, wherein one end of the gas transmission connecting pipe is provided with a thread, the gas transmission connecting pipe is connected with the gas transmission branch pipe through the thread, the other end of the gas transmission connecting pipe is fixedly connected with an air inlet of the flat nozzle, the air flow separation inner core is arranged in the flat nozzle, and an air inlet end of the air flow separation inner core is connected with the air inlet of the flat nozzle;
furthermore, the airflow separation inner core is of an integrally formed structure and is divided into an inner core tip and an inner core tail end, wherein the inner core tip of the airflow separation inner core is fixedly connected with the air inlet of the flat nozzle;
furthermore, the tail end of the inner core is conical, and the top end of the inner core is provided with an opening;
furthermore, the tip of the inner core is in a pyramid shape, and the top end of the inner core is provided with a square opening.
The utility model discloses an adopt the setting of flat spout for jetting area and effective effect area will be big than traditional circular orifice area, and the jetting dynamics in the cover area is even, can prevent effectively that local atress is too big, and the catalyst top layer damages, the utility model discloses install in the avris of the top certain distance on catalyst top layer, can effectually solve the problem in traditional soot blower jetting blind spot, solve local deposition and block up the problem.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view of the nozzle structure of the present invention;
FIG. 3 is a schematic view of the nozzle specification of the present invention;
fig. 4 is a side view of the nozzle of the present invention;
fig. 5 is a side view of the air flow separation core of the present invention;
FIG. 6 is a schematic structural view of the air flow separation core of the present invention;
fig. 7 is a schematic view of the arrangement and installation of the present invention.
In the figure: 1-compressed air bag; 2-switching the electromagnetic valve; 3-a gas transmission main pipe; 4-gas transmission branch pipe; 5-flat spout; 6-an air flow separation inner core; 7-gas transmission connecting pipe; 8-core tip; 9-core end, 10-catalyst;
the method comprises the following steps of (1) determining the opening width of an NW-flat nozzle 5, the opening thickness of an NH-flat nozzle 5, the nozzle length of an ND-flat nozzle 5, the opening included angle of the Na-flat nozzle 5, the flat included angle of the Nb-flat nozzle 5, the CL 1-core tip 8 length, the CL 2-core tail end 9 length, the Ce-core tip 8 included angle, the Cb-core tail end 9 included angle, the Cd 1-core tip 8 diameter, the Cd 2-core tail end 9 diameter, the CH-core tail end 9 square side length, and the distance between the center line of a Dh-gas transmission main pipe 3 and the surface layer of a catalyst 10; the angle of the Da-flat spout 5 to the horizontal.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-2, the utility model discloses a compressed air gas bag 1, switching solenoid valve 2, gas transmission house steward 3, nozzle unit, gas transmission house steward 3's one end is connected with compressed air gas bag 1, the other end adopts head or end cover seal, be equipped with n (n >1) gas transmission branch pipe 4 in one side of gas transmission house steward 3, gas transmission branch pipe 4 end has a helicitic texture, 1 nozzle unit is connected to every gas transmission branch pipe 4, nozzle unit includes gas transmission connecting pipe 7, flat spout 5 and air current separation inner core 6, gas transmission connecting pipe 7 one side is provided with the screw thread, carry out fixed connection through the screw thread and the helicitic texture of gas transmission branch pipe 4 end, flat spout 5 is connected to the opposite side; a short section is arranged at the joint of the flat nozzle 5 and the gas transmission connecting pipe 7, and the flat nozzle 5 is in threaded connection or welded with the gas transmission connecting pipe 7 through the short section; the air flow separation inner core 6 is arranged in the flat nozzle 5, the air flow separation inner core 6 is integrally formed and is divided into an inner core tip 8 and an inner core tail end 9, the inner core tip 8 is fixedly connected with an air inlet of the flat nozzle 5, the air flow separation inner core 6 cannot move in the flat nozzle 5, the outer size of the air flow separation inner core 6 is consistent with the inner size of the flat nozzle 5 and is clamped in the flat nozzle 5 through tight fit, the height of the air outlet end of the flat nozzle 5 is consistent with the height of the inner core tail end 9, the flat nozzle 5 is convenient to be fixed by spot welding from the outer side, the air flow separation inner core 6 is arranged after the upper surface, the lower surface, the left surface and the right surface are combined, and the inner core tip 8 is finally combined with the; the number of the gas transmission branch pipes 4 is consistent with that of the nozzle units; the storage volume of the compressed air bag 1 is 300-800L, the pipe diameter selected by the air transmission main pipe 3 is DN50-DN80, and the pipe diameter selected by the air transmission branch pipe 4 is DN 15.
As shown in fig. 3-4, the opening angle Na of the flat nozzle 5 is 75-150 °, the opening thickness NH is 3-12 mm, the flat nozzle 5 flat angle Nb is 5-12 °, the flat nozzle 5 nozzle length ND is 150-180mm, and the opening width NW of the flat nozzle 5 is determined according to the flat nozzle 5 nozzle length ND and the flat nozzle 5 flat angle Nb.
As shown in fig. 5-6, the air flow separation core 6 is divided into a core tip 8 and a core tail end 9, and the core air inlet end 8 is connected with the air transmission connecting pipe 7; the length CL1 of the tip 8 of the inner core is 45-75mm, the length CL2 of the tail end 9 of the inner core is 110-140mm, the diameter Cd1 of the tip 8 of the inner core is 2mm, the length CH of the square side of the tail end 9 of the inner core is 3mm-12mm, the included angle Ce of the tip 8 of the inner core is 31.5-75 degrees which is half of the included angle Na of the opening of the flat nozzle 5, and the included angle Cb of the tail end 9 of the inner core is 10-. Because the side length CH of the square edge of the air outlet at the tail end 9 of the inner core is consistent with the opening thickness NH of the flat nozzle 5, air leakage at the opening can be avoided. The size design of the air flow separation inner core 6 is matched with the size design of the flat nozzle 5, so that the air flow separation inner core 6 can uniformly distribute air flow and is tightly attached to the inner wall of the flat nozzle 5.
As shown in fig. 7, the soot blower of the present invention is installed in the SCR reactor at a distance Dh of 500-800mm from the upper surface of the catalyst 10, and at an angle Da of 7-10 degrees downward from the horizontal direction (the surface of the catalyst 10).
The utility model discloses the principle as follows:
example 1:
adopt the utility model discloses be applied to certain cement kiln tail high temperature flue gas SCR denitration side line pilot scale, the volume of handling flue gas 76530m3/hr, flue gas temperature 300-350 ℃, flue gas dust content 115g m 3. Soot blowers in SCR denitration are arranged as shown in figure 7, Dh takes 75mm, and Da takes 7 degrees. The gas transmission manifold 3 of the soot blower is provided with 5 flat nozzles 5 as shown in FIG. 1. The compressed air bag 1 adopts 500L of storage volume, the size DN50 of the air transmission main pipe 3, the size DN15 of the air transmission branch pipe 4 and the interval of 255 mm. The flat spout 5 as shown in fig. 3-4 has the following dimensions: the length ND is 154mm, the opening thickness NH is 5mm, the flat mouth included angle Nb is 9.5 degrees, and the opening width NW is 253 mm. The air flow separating core 6 as shown in fig. 5-6 has the following dimensions: the length CL1 is 45mm, the length CL2 is 110mm, the diameter Cd1 of the tip is 2mm, the diameter Cd2 of the tail end is 32mm, the side length CH of the square at the tail end is 5mm, the included angle Ce of the tip is 37 degrees, and the included angle Cb of the tail end is 14 degrees.
Through a flat nozzle 5The angle of blowing of the cap can be up to 150 deg., and the maximum distance of blowing covered is about 2200 mm. At the flue gas temperature of 300-350 ℃, the dust content of the flue gas is 115g g/m3 isUnder the condition, the catalyst runs for 72hr, and the surface of the catalyst has no phenomena of dust deposition and bridging and has no blockage.
The utility model discloses the advantage lies in:
(1) the compressed air blowing mode is adopted for deashing, so that the problems of water carrying by steam, insufficient deashing strength by sound wave and the like can be avoided.
(2) The compressed air which is quantitatively blown is uniformly distributed and sprayed out in a flat state, and the effective blowing angle can reach 75-150 degrees.
(3) The blowing angle and the horizontal direction form a certain downward included angle, so that the blowing angle can be used for transversely sweeping the surface of the catalyst, and the blowing of an invalid space above the surface of the catalyst is reduced.
(4) The air flow separation inner core can effectively separate air flow, and the uneven conditions that the middle air flow is densely distributed and the air flows on two sides are sparsely distributed are avoided.
Soot blower, can effectively solve SCR denitration technique and be applied to high dust flue gas especially and be applied to catalyst surface deposition ash, the pore structure jam that cement kiln tail flue gas SCR denitration faces, traditional sound wave soot blower and steam rake soot blower have the problem in jetting deashing blind spot.
The above is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a be applicable to high temperature high dust flue gas soot blower for SCR denitration which characterized in that, includes the air feed unit, control air valve unit, gas transmission house steward, nozzle unit, the air feed unit passes through control air valve unit with gas transmission house steward's one end sealing connection gas transmission branch pipe has been seted up to one side of gas transmission house steward, nozzle unit fixed connection be in on the gas transmission branch pipe, wherein, nozzle unit is flat structure.
2. The soot blower suitable for SCR denitration of high-temperature and high-dust flue gas as claimed in claim 1, wherein the gas supply unit is a compressed air bag.
3. The soot blower applicable to SCR denitration of high-temperature and high-dust flue gas as claimed in claim 1, wherein the control air valve unit is an on-off solenoid valve.
4. The soot blower applicable to SCR denitration of high-temperature and high-dust flue gas as claimed in claim 1, wherein n gas transmission branch pipes are arranged on the gas transmission main pipe, wherein n is greater than 1.
5. The soot blower suitable for SCR denitration of high-temperature and high-dust flue gas as claimed in claim 1, wherein the nozzle unit comprises a gas transmission connecting pipe, a flat nozzle and a gas flow separation inner core, wherein one end of the gas transmission connecting pipe is provided with a thread, the gas transmission connecting pipe is connected with the gas transmission branch pipe through the thread, the other end of the gas transmission connecting pipe is fixedly connected with the gas inlet of the flat nozzle, the gas flow separation inner core is arranged in the flat nozzle, and the gas inlet end of the gas flow separation inner core is connected with the gas inlet of the flat nozzle.
6. The soot blower applicable to SCR denitration of high-temperature and high-dust flue gas as claimed in claim 5, wherein the air flow separation inner core is of an integrally formed structure and is divided into an inner core tip and an inner core tail end, wherein the inner core tip of the air flow separation inner core is fixedly connected with the air inlet of the flat nozzle.
7. The soot blower suitable for SCR denitration of high-temperature and high-dust flue gas as claimed in claim 6, wherein the tail end of the inner core is conical, and the top end of the inner core is provided with an opening.
8. The soot blower suitable for SCR denitration of high-temperature and high-dust flue gas as claimed in claim 6, wherein the tip of the inner core is pyramid-shaped, and the top end is provided with a square opening.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020613285.7U CN212167060U (en) | 2020-04-22 | 2020-04-22 | Soot blower suitable for SCR denitration of high-temperature and high-dust flue gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020613285.7U CN212167060U (en) | 2020-04-22 | 2020-04-22 | Soot blower suitable for SCR denitration of high-temperature and high-dust flue gas |
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| CN212167060U true CN212167060U (en) | 2020-12-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856445A (en) * | 2020-12-28 | 2021-05-28 | 上海域德环保工程有限公司 | Adjustable injection urea can get rid of waste heat stove of flying dust |
| CN116498983A (en) * | 2023-06-27 | 2023-07-28 | 山西毅诚科信科技有限公司 | Rake type soot blower with self-cleaning function |
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2020
- 2020-04-22 CN CN202020613285.7U patent/CN212167060U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856445A (en) * | 2020-12-28 | 2021-05-28 | 上海域德环保工程有限公司 | Adjustable injection urea can get rid of waste heat stove of flying dust |
| CN116498983A (en) * | 2023-06-27 | 2023-07-28 | 山西毅诚科信科技有限公司 | Rake type soot blower with self-cleaning function |
| CN116498983B (en) * | 2023-06-27 | 2023-08-29 | 山西毅诚科信科技有限公司 | Rake type soot blower with self-cleaning function |
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