CN111111436A

CN111111436A - Reduce NO in waste gas generated by coke ovenxSCR denitration reactor of content

Info

Publication number: CN111111436A
Application number: CN202010048856.1A
Authority: CN
Inventors: 张五洲; 袁子清; 刁宗飞; 朱威
Original assignee: Yizhou Technology Co ltd
Current assignee: Yizhou Technology Co ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-05-08

Abstract

The invention discloses a method for reducing NO in waste gas generated by a coke oven_xThe SCR denitration reactor comprises a shell and a catalyst bed layer, wherein a first air inlet pipe is fixedly installed at the upper end of the shell, a second air inlet pipe is installed at the right end of the shell, a third air inlet pipe is installed at the left end of the shell, an inclined plane is formed in the lower side of the shell, an air outlet pipe is fixedly installed at the right lower side of the shell, an outlet end is fixedly installed at the bottom end of the shell, an installation frame is fixedly installed at the right side of the shell, and a buffer plate is fixedly installed inside a buffer box; the catalyst bed layer is fixedly arranged in the shell. The reduction of NO in the exhaust gas generated by the coke oven_xThe SCR denitration reactor with the content has the advantages that the gas in the gas distribution box enters the catalyst bed layer through the through hole at the lower end of the gas distribution box, so that the gas is uniformly sprayed to catalyzeThe surface of the catalyst bed layer ensures that the flue gas is uniformly distributed in the reactor, and has the characteristics of simple structure, convenient use, low cost, good effect and suitability for popularization.

Description

Reduce NO in waste gas generated by coke ovenxSCR denitration reactor of content

Technical Field

The invention relates to an environment-friendly equipment technologyThe technical field, in particular to a method for reducing NO in waste gas generated by a coke oven_xSCR denitration reactor of content.

Background

The coke oven smoke emission pollution is the headache in the coking industry, the waste gas is doped with more nitrogen oxides, namely what we say, the denitration is an important problem of environmental protection, and the industry is used to a low-temperature denitration technology; naturally, the denitration techniques for the coke oven flue gas also include: low-nitrogen combustion technology, selective catalytic reduction technology, oxidation denitration technology and the like; the SCR flue gas denitration system is a system for denitration of flue gas by adopting a selective catalytic reduction method, and the SCR flue gas denitration technology means that a reducing agent (generally ammonia) selectively carries out denitration on NO in the flue gas in the presence of a catalyst and oxygen within a low temperature range (generally within 310-420℃)_xReduction to form N₂And water to reduce NO_xTechniques for venting; the SCR denitration reactor in the system is a very critical device; however, in practice, it is found that the flue gas guiding device at the air inlet end of the existing SCR denitration reactor has a complicated structure and is not reasonably designed, so that flue gas (containing ammonia gas, oxygen gas and NO) conveyed from the air inlet flue is caused_x) Can not be uniformly distributed on the denitration catalyst for catalytic reaction, has small contact area of flue gas and the denitration catalyst and short contact time, thereby leading the reaction efficiency of the SCR denitration reactor to be greatly reduced and leading the Nitrogen Oxide (NO) at the air outlet of the SCR denitration reactor_x) And the escape of ammonia gas is too high, so that huge economic loss is caused.

In order to overcome the defects existing in the current market, the technology of improving the SCR denitration reactor is urgently needed.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects mentioned in the background technology and provide a method for reducing NO in waste gas generated by a coke oven_xSCR denitration reactor of content.

In order to achieve the purpose, the invention provides the following technical scheme: reduce NO in waste gas generated by coke oven_xThe SCR denitration reactor comprises a shell and a catalystThe bed layer, the upper end of the said body is fixedly fitted with the first intake pipe, and the right end of the body is fitted with the second intake pipe, the left end of the body is fitted with the third intake pipe at the same time, and the underside of the body has inclined planes, the right underside of the body is fixedly fitted with the air outlet duct, and the bottom end of the body is fixedly fitted with the exit end, the right side of the body is fixedly fitted with the mounting bracket at the same time, the inside of the baffle-box is;

catalyst bed fixed mounting is inside the casing, and catalyst bed upside is provided with the gas distribution case, and gas distribution case internally mounted has the blast pipe simultaneously to blast pipe upper end and distribution case fixed connection, the baffle-box setting is at the inside upside of casing, and the downside of baffle-box and air guide plate fixed connection.

Preferably, the lower end of the first air inlet pipe penetrates through the shell and the buffer box in sequence, the lower end of the first air inlet pipe is fixedly connected with the spray pipe, and the bottom of the spray pipe is fixedly connected with the nozzle.

Preferably, the buffer board inside the buffer box is arranged in an inverted truncated cone shape, and the nozzle is arranged above the buffer board.

Preferably, the buffer block is fixedly connected to the buffer plate, and the buffer block is arranged on the surface of the buffer plate in a zigzag manner.

Preferably, the left end of the second air inlet pipe extends to the inside of the buffer tank, and the right end of the third air inlet pipe extends to the inside of the buffer tank.

Preferably, the buffer plate is communicated with the distribution box through an air guide plate at the bottom, and the distribution box is communicated with the air distribution box through an exhaust pipe.

Preferably, the exhaust pipes are arranged in four groups at the bottom of the distribution box, the inside of the gas distribution box is divided into four areas through the partition plate, and meanwhile, the four groups of exhaust pipes are sequentially distributed in the four areas.

Preferably, the air distribution box and the shell are of a concentric circle structure, and the bottom of the air distribution box is provided with a through hole.

Compared with the prior art, the invention has the beneficial effects that:

1. the gas is uniformly sprayed on the surface of the catalyst bed layer, so that the flue gas is uniformly distributed in the reactor, the reaction efficiency is improved, the energy consumption of the system is reduced, and the reactor is simple in structure, convenient to use, low in cost, good in effect and suitable for popularization;

2. the buffer block of cockscomb structure is seted up on the buffer board, slows down the gas that strikes on it, reduces the kinetic energy of the gas that strikes on it for inside gas distribution box is discharged through air guide plate and distribution box after the gas is slowed down.

Drawings

FIG. 1 is a schematic front view of the structure of the present invention;

FIG. 2 is a schematic cross-sectional view of a structure A-A of the present invention;

FIG. 3 is a schematic view of the structure of the distribution box of the present invention;

FIG. 4 is a schematic view of the buffer box according to the present invention.

Reference numbers in the figures: 1. a first intake pipe; 2. a housing; 3. a buffer tank; 4. a buffer plate; 5. a second intake pipe; 6. a gas guide plate; 7. a distribution box; 8. an exhaust pipe; 9. a catalyst bed layer; 10. a mounting frame; 11. an inclined surface; 12. an air outlet pipe; 13. an outlet end; 14. an air distribution box; 15. a third intake pipe; 16. a spout; 17. a nozzle; 18. a separator plate; 19. a through hole; 20. and a buffer block.

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 a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: reduce NO in waste gas generated by coke oven_xSCR denitration reactor of content, including casing 2 and

catalyst bed

9, 2 upper ends fixed mounting of casing have first intake pipe 1, and 2 right-hand members of casing install second intake pipe 5, and third intake pipe 15 is installed to 2 left ends of casing simultaneously to inclined plane 11 has been seted up to 2 downside of casing, and the left end of second intake pipe 5 extends to baffle-box 3And the right end of the third air intake pipe 15 extends to the inside of the surge tank 3; the lower end of the first air inlet pipe 1 sequentially penetrates through the shell 2 and the buffer box 3, the lower end of the first air inlet pipe 1 is fixedly connected with the spray pipe 17, and the bottom of the spray pipe 17 is fixedly connected with the nozzle 16; an air outlet pipe 12 is fixedly arranged at the lower right side of the shell 2, an outlet end 13 is fixedly arranged at the bottom end of the shell 2, an installation frame 10 is fixedly arranged at the right side of the shell 2, and a buffer plate 4 is fixedly arranged in the buffer tank 3; the buffer plate 4 is fixedly connected with a buffer block 20, and the buffer block 20 is arranged on the surface of the buffer plate 4 in a zigzag manner; the buffer plate 4 in the buffer box 3 is arranged in an inverted frustum shape, and the nozzle 16 is arranged above the buffer plate 4; the buffer plate 4 is communicated with a distribution box 7 through an air guide plate 6 at the bottom, and the distribution box 7 is communicated with an air distribution box 14 through an exhaust pipe 8; the catalyst bed layer 9 is fixedly arranged in the shell 2, the upper side of the catalyst bed layer 9 is provided with the air distribution box 14, the air distribution box 14 is internally provided with the exhaust pipes 8, the upper ends of the exhaust pipes 8 are fixedly connected with the distribution box 7, the exhaust pipes 8 are arranged in four groups at the bottom of the distribution box 7, the inside of the air distribution box 14 is divided into four areas through the partition plate 18, and meanwhile, the four groups of exhaust pipes 8 are sequentially distributed in the four areas; the buffer box 3 is arranged at the upper side in the shell 2, and the lower side of the buffer box 3 is fixedly connected with the air guide plate 6; the air distribution box 14 and the shell 2 are of concentric circle structures, and the bottom of the air distribution box 14 is provided with a through hole 19;

as shown in fig. 1 and 4: gas ejected from the three groups of gas inlet pipes impacts on the buffer plate 4 to decelerate the mixed gas, the buffer plate 4 is provided with a serrated buffer block 20 to decelerate the gas impacting on the buffer plate 4 and reduce kinetic energy of the gas impacting on the buffer plate, so that the gas is exhausted into the gas distribution box 14 through the gas guide plate 6 and the distribution box 7 after being decelerated;

the mixed gas in the distribution box 7 is sprayed from the exhaust pipe 8 and sequentially enters the gas distribution box 14, the gas in the gas distribution box 14 enters the catalyst bed layer 9 through the through hole 19 at the lower end of the gas distribution box, so that the gas is uniformly sprayed on the surface of the catalyst bed layer 9, and the flue gas is uniformly distributed in the reactor;

the mixed gas enters a flue and then is fully mixed with the flue gas through an ammonia/flue gas mixer, and then enters an SCR reactor through three groups of air inlet pipes, the operation temperature of the SCR reactor can be 230-420 ℃, a temperature measuring point is positioned on an inlet flue in front of the SCR reactor, and when the temperature is out of the range of 230-420 ℃, a temperature signal automatically closes a quick cut-off valve for the ammonia to enter the ammonia/nitrogen gas mixer; the ammonia reacts with the nitrogen oxide in the SCR reactor to generate nitrogen and water, and the water and the nitrogen generated by the reaction are discharged through the gas outlet pipe 12 along with the flue gas.

The reduction of NO in the exhaust gas generated by the coke oven_xDuring the SCR denitration reactor of content, the gas mixture enters into buffer tank 3 through first intake pipe 1, second intake pipe 5 and third intake pipe 15 respectively, the gas that sprays out from three groups of intake pipes strikes on buffer board 4, after slowing down the gas mixture, enter into the inside of distribution box 7 through air deflector 6, the gas mixture of the inside of distribution box 7 sprays from blast pipe 8 simultaneously, enter into gas distribution box 14 inside in proper order, the gas of the inside of gas distribution box 14 passes through-hole 19 of its lower extreme, enter into on catalyst bed 9, carry out the denitration operation, this is exactly that this reduces in the coke oven production waste gas NO_xThe whole working process of the SCR denitration reactor.

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. Reduce NO in waste gas generated by coke oven_xSCR denitration reactor of content, including casing (2) and catalyst bed (9), its characterized in that: casing (2) upper end fixed mounting has first intake pipe (1), and casing (2) right-hand member installs second intake pipe (5), and third intake pipe (15) are installed to casing (2) left end simultaneously to inclined plane (11) have been seted up to the downside of casing (2), and the right downside fixed mounting of casing (2) has outlet duct (12), and the shellAn outlet end (13) is fixedly arranged at the bottom end of the body (2), an installation frame (10) is fixedly arranged on the right side of the shell (2), and a buffer plate (4) is fixedly arranged in the buffer box (3);

catalyst bed (9) fixed mounting is inside casing (2), and catalyst bed (9) upside is provided with gas distribution case (14), and gas distribution case (14) internally mounted has blast pipe (8) simultaneously to blast pipe (8) upper end and distribution case (7) fixed connection, and baffle-box (3) set up in the inside upside of casing (2), and the downside and the air guide plate (6) fixed connection of baffle-box (3).

2. The method of claim 1, wherein the NO content in the waste gas generated by the coke oven is reduced_xSCR denitration reactor of content which characterized in that: the lower extreme of first intake pipe (1) passes casing (2) and buffer tank (3) setting in proper order, and the lower extreme and spray tube (17) fixed connection of first intake pipe (1), spray tube (17) bottom and spout (16) fixed connection simultaneously.

3. The method of claim 1, wherein the NO content in the waste gas generated by the coke oven is reduced_xSCR denitration reactor of content which characterized in that: buffer board (4) inside buffer box (3) are the setting of inverted circular truncated cone shape, and spout (16) set up the top at buffer board (4).

4. The method of claim 1, wherein the NO content in the waste gas generated by the coke oven is reduced_xSCR denitration reactor of content which characterized in that: fixedly connected with buffer block (20) on buffer plate (4), and buffer block (20) set up at the surperficial zigzag of buffer plate (4).

5. The method of claim 1, wherein the NO content in the waste gas generated by the coke oven is reduced_xSCR denitration reactor of content which characterized in that: the left end of the second air inlet pipe (5) extends to the inside of the buffer box (3), and the right end of the third air inlet pipe (15) extends to the inside of the buffer box (3).

6. The method of claim 1, wherein the NO content in the waste gas generated by the coke oven is reduced_xSCR denitration reactor of content which characterized in that: the buffer plate (4) is communicated with the distribution box (7) through the air guide plate (6) at the bottom, and the distribution box (7) is communicated with the air distribution box (14) through the exhaust pipe (8).

7. The method of claim 1, wherein the NO content in the waste gas generated by the coke oven is reduced_xSCR denitration reactor of content which characterized in that: the exhaust pipes (8) are arranged into four groups at the bottom of the distribution box (7), the interior of the gas distribution box (14) is divided into four areas through partition plates (18), and meanwhile, the four groups of exhaust pipes (8) are sequentially distributed in the four areas.

8. The method of claim 1, wherein the NO content in the waste gas generated by the coke oven is reduced_xSCR denitration reactor of content which characterized in that: the air distribution box (14) and the shell (2) are of concentric circle structures, and a through hole (19) is formed in the bottom of the air distribution box (14).