CN210303173U

CN210303173U - Medium and low temperature kiln flue gas SCR denitration device

Info

Publication number: CN210303173U
Application number: CN201920563372.3U
Authority: CN
Inventors: 傅仰林
Original assignee: Jiangxi Dragon Environmental Protection Engineering Co Ltd
Current assignee: Jiangxi Dragon Environmental Protection Engineering Co Ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-04-14
Anticipated expiration: 2029-04-24

Abstract

The utility model relates to the technical field of industrial waste gas treatment, and discloses a medium-low temperature kiln flue gas SCR denitration device, which solves the problems that the general SCR denitration device can not fully mix ammonia gas and nitrogen oxide in the using process, and the catalyst in the SCR denitration device is easy to have blocking phenomenon or the inner wall of the denitration device is easy to accumulate dust; the utility model can fully mix ammonia gas and flue gas through the matching use of the arranged guide plate, the baffle plate and the like, and then the ammonia gas and the flue gas are rectified by the rectifying grille, thereby ensuring the mixing quality of the ammonia gas and the nitrogen oxide in the flue gas; the catalyst inside through the three screen frame that sets up and the cooperation of three ultrasonic wave soot blower etc. are used, carry out many times forced purging to the catalyst of three screen frame inside through the ultrasonic wave soot blower, avoid the catalyst to take place to block up new phenomenon, or the inside more dust of accumulation of reactor.

Description

Medium and low temperature kiln flue gas SCR denitration device

Technical Field

The utility model belongs to the technical field of industrial waste gas handles, specifically be a middle and low temperature kiln flue gas SCR denitration device.

Background

In order to prevent excessive nitrogen oxides generated after coal in a boiler is combusted from polluting the environment, the coal is subjected to denitration treatment, wherein cement denitration is developed domestically, and the denitration method belongs to an exploration demonstration stage and is not scientifically summarized; whether various design process technical lines and equipment facilities are scientific and reasonable, the operation is reliable, the denitration efficiency, the operation cost, the cement energy consumption, the emission amount of secondary pollutants and the like are subjected to practical tests, wherein SCR denitration equipment is required.

However, the mixing quality of ammonia and nitrogen oxides cannot be achieved in the use process of a general SCR denitration device, and the catalyst in the general SCR denitration device is easily clogged or dust is easily accumulated on the inner wall of the denitration device in the use process of the general SCR denitration device, which may reduce the work efficiency of the denitration device.

Disclosure of Invention

To the above situation, for overcoming prior art's defect, the utility model provides a well low temperature kiln flue gas SCR denitration device, the effectual in-process of having solved general SCR denitration device and using can not make ammonia and nitrogen oxide's mixed quality, and the easy accumulation dust of inner wall that takes place blocking phenomenon or denitration device easily at its inside catalyst of in-process that uses of general SCR denitration device, can reduce denitration device's work efficiency's problem.

In order to achieve the above object, the utility model provides a following technical scheme: the SCR denitration device for the medium-low temperature kiln flue gas comprises a reactor and an air inlet pipe, wherein the top end of the reactor is fixedly communicated with one end of a bent pipe, the other end of the bent pipe is fixedly communicated with one end of a guide pipe, the other end of the guide pipe is fixedly communicated with an outlet of an economizer, an inlet of the economizer is fixedly communicated with one end of an air guide pipe, the other end of the air guide pipe is fixedly communicated with one end of the air inlet pipe, a fan is fixedly installed on the outer wall of one side of the air inlet pipe, an air outlet of the fan is fixedly communicated with the other end of the air inlet pipe, an air inlet of the fan is communicated with an external flue gas pipe, the bottom end of the reactor is fixedly communicated with one end of an exhaust pipe, a rectifying grid is fixedly installed at the top of the reactor, three sieve bodies are installed in the middle of the reactor at equal intervals, catalysts are filled in the three, the outer wall fixed mounting of reactor one side has three ultrasonic wave soot blower, and the delivery outlet of three ultrasonic wave soot blower communicates with the one end of three soot blower pipe is fixed respectively, and the inside fixed mounting of return bend one end has an ammonia injection grid and two vortex mixer, and two vortex mixers are located the top of ammonia injection grid, and a plurality of ammonia shower nozzle is installed to the top equidistance of ammonia injection grid, and a plurality of baffle is installed to the other end equidistance of return bend.

Preferably, a plurality of the ammonia shower nozzle all with the fixed intercommunication of the one end of defeated ammonia pipe, the other end of defeated ammonia pipe and the fixed intercommunication in top of evaporimeter, the bottom of evaporimeter is through the fixed intercommunication in one end of communicating pipe with the ammonia storage tank, and the middle part fixed mounting of communicating pipe has the valve.

Preferably, a plurality of guide plates are fixedly arranged inside the bent pipe and inside the guide pipe.

Preferably, the other end of the exhaust pipe is fixedly communicated with the inside of the electric dust collector.

Preferably, the pipe wall of the air inlet pipe and the pipe wall of the exhaust pipe are both sleeved with the air preheater.

Preferably, four corners of ammonia storage tank bottom and four equal fixed mounting in corners of evaporimeter bottom have the supporting leg, and the equal fixed mounting of eight supporting legs is on the top of bottom plate.

Compared with the prior art, the beneficial effects of the utility model are that:

1) during work, the guide plate, the vortex mixer, the baffle and the like are matched, so that when smoke enters the guide pipe, the guide plate arranged in the guide pipe plays a role in guiding the smoke, then the smoke enters the bent pipe, at the moment, ammonia gas and the smoke can be fully mixed through the two vortex mixers arranged in the bent pipe, and then the ammonia gas and nitrogen oxides in the smoke are mixed under the rectification effect of the rectification grating;

2) in the work, through the inside catalyst of three screen frames that sets up and the cooperation use of three ultrasonic wave soot blower etc. can carry out many times forced purging to the inside catalyst of three screen frames through the ultrasonic wave soot blower, clear away the dust that has deposition and reactor inner wall to avoid the catalyst to take place to block up new phenomenon, or the inside more dust of accumulation of reactor.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the reactor of the present invention;

FIG. 3 is a schematic view of the internal installation structure of the reactor of the present invention;

in the figure: 1. a reactor; 2. bending the pipe; 3. a flow guide pipe; 4. an air inlet pipe; 5. a fan; 6. An air duct; 7. a coal economizer; 8. an ammonia storage tank; 9. an evaporator; 10. an air preheater; 11. An electric dust collector; 12. a baffle; 13. an ammonia conveying pipe; 14. an ammonia injection grid; 15. a vortex mixer; 16. a baffle plate; 17. a rectifying grid; 18. a screen body; 19. an ultrasonic soot blower; 20. A soot blowing pipe; 21. an ammonia gas nozzle; 22. and (4) exhausting the gas.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the first embodiment, as shown in fig. 1-3, the present invention comprises a reactor 1 and an air inlet pipe 4, the top end of the reactor 1 is fixedly connected to one end of a bent pipe 2, the other end of the bent pipe 2 is fixedly connected to one end of a flow guide pipe 3, the other end of the flow guide pipe 3 is fixedly connected to the outlet of an economizer 7, the inlet of the economizer 7 is fixedly connected to one end of an air guide pipe 6, the other end of the air guide pipe 6 is fixedly connected to one end of the air inlet pipe 4, a fan 5 is fixedly installed on the outer wall of one side of the air inlet pipe 4 for sucking the external flue gas into the air inlet pipe 4, the air outlet of the fan 5 is fixedly connected to the other end of the air inlet pipe 4, the air inlet of the fan 5 is communicated to the external flue gas pipe, the bottom end of the reactor 1 is fixedly connected to one end of an exhaust pipe 22, three sieve bodies 18 are equidistantly arranged in the middle of the reactor 1, catalysts are filled in the three sieve bodies 18, the reaction of flue gas and ammonia gas can be guaranteed, soot blowing pipes 20 are fixedly arranged at the bottoms of the three sieve bodies 18, a plurality of blowing holes are formed in the outer wall of each soot blowing pipe 20, three ultrasonic soot blowers 19 are fixedly arranged on the outer wall of one side of the reactor 1, the output ports of the three ultrasonic soot blowers 19 are respectively and fixedly communicated with one ends of the three soot blowing pipes 20, the treatment of dust accumulated on the inner wall of the reactor 1 can be avoided, an ammonia injection grid 14 and two vortex mixers 15 are fixedly arranged in one end of the elbow 2, the two vortex mixers 15 are positioned at the top ends of the ammonia injection grid 14, the flue gas and the ammonia gas can be mixed from beginning to end, a plurality of ammonia nozzles 21 are equidistantly arranged at the top ends of the ammonia injection grid 14, a plurality of baffle plates 16 are equidistantly arranged at the other end of the, so as to change the flow direction of the mixed gas.

Second embodiment, on the basis of first embodiment, a plurality of ammonia shower nozzle 21 all with the fixed intercommunication of the one end of defeated ammonia pipe 13, the fixed intercommunication in the other end of defeated ammonia pipe 13 and the top of evaporimeter 9, the bottom of evaporimeter 9 is through the fixed intercommunication in one end of communicating pipe and ammonia storage tank 8, and the middle part fixed mounting of communicating pipe has the valve, is convenient for carry the inside of return bend 2 with the ammonia.

In the third embodiment, on the basis of the first embodiment, a plurality of guide plates 12 are fixedly installed inside the elbow 2 and inside the guide pipe 3, so that the flow direction of the flue gas can be ensured.

In the fourth embodiment, on the basis of the first embodiment, the other end of the exhaust pipe 22 is fixedly communicated with the inside of the electric dust collector 11, so that dust with small particles in the treated flue gas can be treated.

In the fifth embodiment, on the basis of the first embodiment, the pipe wall of the air inlet pipe 4 and the pipe wall of the exhaust pipe 22 are both sleeved with the air preheater 10, so that the temperature of the flue gas can be reduced.

Sixth embodiment, on the basis of second embodiment, the equal fixed mounting in four edges of 8 bottoms in the ammonia storage tank and the equal fixed mounting in four edges of 9 bottoms in evaporimeter has the supporting leg, and the equal fixed mounting of eight supporting legs is on the top of bottom plate, is convenient for install ammonia storage tank 8 and evaporimeter 9.

The working principle is as follows: when the device works, firstly, the three ultrasonic soot blowers 19 are started, the ultrasonic soot blowers 19 perform forced blowing on dust accumulated on the inner wall of the reactor 1 and catalyst inside the three screen bodies 18 for a plurality of times through the soot blowing pipes 20 to remove the existing soot and the dust on the inner wall of the reactor 1, so that the catalyst is prevented from being blocked, then, the fan 5 is started, the fan 5 generates suction force to convey flue gas to the inside of the air inlet pipe 4, because the pipe wall of the air inlet pipe 4 is sleeved with the air preheater 10, at the moment, the air preheater 10 performs heat absorption treatment on the temperature in the flue gas, then the flue gas passes through the air duct 6 and enters the inside of the economizer 7 through the inlet port of the economizer 7, at the moment, the economizer 7 performs secondary heat absorption treatment on the flue gas inside the economizer 7, so that the temperature of the flue gas is reduced, then the flue gas enters the inside of the draft tube 3 through the outlet of the economizer 7, the flue gas that can carry out the water conservancy diversion to the entering, flue gas after the water conservancy diversion enters into the inside of return bend 2, at this moment open the valve, the inside ammonia of ammonia storage tank 8 enters into the inside of evaporimeter 9, the ammonia after the evaporimeter 9 is handled enters into the inside of a plurality of ammonia shower nozzle 21 through defeated ammonia pipe 13, then spout, thereby make ammonia and ammonia contact, then through installing two vortex mixer 15 in return bend 2 one end inside, can make ammonia and flue gas abundant mixing, then under the effect of guide plate 12 and a plurality of baffle 16 that the return bend 2 is inside fixedly mounted, the gas after mixing enters into the inside of reactor 1, the gas after mixing carries out the rectification effect to the mixed gas through the rectifier grating 17 that reactor 1 top was installed at first, then contact with the catalyst that fills in three screen packs 18 that reactor 1 middle part fixedly mounted, under the effect of catalyst, the ammonia produces chemical reaction with the flue gas to harmful gas to in the flue gas handles, then the flue gas after handling enters into the inside of electrostatic precipitator 11 through blast pipe 22, at this moment because blast pipe 22 cup joints with air heater 10, can further absorb the inside heat of flue gas, thereby handle the less dust of granule in the flue gas, can discharge the external world, thereby avoid causing the pollution to the environment on every side.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a well low temperature kiln flue gas SCR denitration device, includes reactor (1) and intake pipe (4), its characterized in that: the top of reactor (1) and the fixed intercommunication of one end of return bend (2), the other end of return bend (2) and the fixed intercommunication of one end of honeycomb duct (3), the other end of honeycomb duct (3) and the fixed intercommunication of export of economizer (7), the inlet port of economizer (7) and the fixed intercommunication of one end of air duct (6), the other end of air duct (6) and the fixed intercommunication of one end of intake pipe (4), the outer wall fixed mounting of intake pipe (4) one side has fan (5), the air outlet of fan (5) and the fixed intercommunication of the other end of intake pipe (4), the air intake and external flue gas pipe intercommunication of fan (5), the bottom of reactor (1) and the fixed intercommunication of one end of blast pipe (22), the top fixed mounting of reactor (1) has rectification grid (17), three screen frame (18) are installed to the middle part equidistance of reactor (1), the inside of three screen frame (18) all is filled with the catalyst, the equal fixed mounting in bottom of three screen frame (18) has soot blowing pipe (20), and the outer wall of every soot blowing pipe (20) has all been seted up a plurality of and has been blown the hole, the outer wall fixed mounting of reactor (1) one side has three ultrasonic wave soot blower (19), the delivery outlet of three ultrasonic wave soot blower (19) respectively with the fixed intercommunication of the one end of three soot blowing pipe (20), the inside fixed mounting of return bend (2) one end has one ammonia injection grid (14) and two vortex mixer (15), and two vortex mixer (15) are located the top of ammonia injection grid (14), a plurality of ammonia shower nozzle (21) are installed to the top equidistance of ammonia injection grid (14), a plurality of baffle (16) are installed to the other end equidistance of return bend (2).

2. The medium and low temperature kiln flue gas SCR denitration device of claim 1, which is characterized in that: a plurality of ammonia shower nozzle (21) all with the fixed intercommunication of the one end of defeated ammonia pipe (13), the other end of defeated ammonia pipe (13) and the fixed intercommunication in top of evaporimeter (9), the bottom of evaporimeter (9) is through the fixed intercommunication in one end of communicating pipe and ammonia storage tank (8), and the middle part fixed mounting of communicating pipe has the valve.

3. The medium and low temperature kiln flue gas SCR denitration device of claim 1, which is characterized in that: a plurality of guide plates (12) are fixedly arranged in the bent pipe (2) and the guide pipe (3).

4. The medium and low temperature kiln flue gas SCR denitration device of claim 1, which is characterized in that: the other end of the exhaust pipe (22) is fixedly communicated with the inside of the electric dust collector (11).

5. The medium and low temperature kiln flue gas SCR denitration device of claim 1, which is characterized in that: the pipe wall of the air inlet pipe (4) and the pipe wall of the exhaust pipe (22) are sleeved with the air preheater (10).

6. The medium and low temperature kiln flue gas SCR denitration device of claim 2, characterized in that: four corners of ammonia storage tank (8) bottom and four equal fixed mounting in corners of evaporimeter (9) bottom have the supporting leg, and the equal fixed mounting of eight supporting legs is on the top of bottom plate.