CN220460335U

CN220460335U - Ammonia air dilution mixing device for flue gas denitration

Info

Publication number: CN220460335U
Application number: CN202321966098.7U
Authority: CN
Inventors: 沈云开; 谢成龙; 邱志松
Original assignee: Anhui Minjian Environmental Protection Equipment Co ltd
Current assignee: Anhui Minjian Environmental Protection Equipment Co ltd
Priority date: 2023-07-25
Filing date: 2023-07-25
Publication date: 2024-02-09
Anticipated expiration: 2033-07-25

Abstract

The utility model relates to an ammonia space dilution mixing device for flue gas denitration, which comprises a box body, a motor arranged on one side of the box body, and a smoke inlet pipe arranged at the bottom of the motor and arranged on one side of the box body, wherein a supporting plate is arranged on one side of the box body, a cylinder is arranged in the box body, a rotating rod is in rotating fit with the cylinder, a belt is sleeved between one end of the rotating rod and the output end of the motor, a plurality of fixing blocks are sleeved on the periphery of the cylinder, and a rotating shaft is in rotating fit with the fixing blocks.

Description

Ammonia air dilution mixing device for flue gas denitration

Technical Field

The utility model relates to the field of flue gas denitration, in particular to an ammonia-air dilution mixing device for flue gas denitration.

Background

At present, the most widely applied flue gas denitration technology of power plants at home and abroad is a selective catalytic reduction technology, denitration treatment is generally carried out in an SCR denitration reactor, and the main principle is as follows: under the action of a catalyst, a reducing agent (generally ammonia gas and air mixed gas) is fully mixed with nitrogen oxides in the tail smoke of the boiler and reacts to generate nitrogen and water, so that the aim of denitration is fulfilled. The reducing agent used in the process needs to be uniformly sprayed into a flue through a corresponding ammonia spraying device to be mixed with flue gas, the uniform mixing degree of the reducing agent and the flue gas can directly influence the operation efficiency and the operation effect of the denitration system, when the mixing effect is poor, adverse effects such as low denitration efficiency, high ammonia escape rate, increased operation resistance of the air preheater and the like can occur, and the safe and stable operation of a boiler host can be seriously influenced.

The patent of publication number CN210495941U discloses an empty mixing arrangement that dilutes of ammonia that flue gas denitration used, concretely relates to flue gas denitration field, including ammonia conveyer pipe and flue gas passageway, be provided with three group's ammonia pipe that spouts on the ammonia conveyer pipe, it spouts ammonia pipe, second and third respectively and spout the ammonia pipe for first ammonia pipe, the outside of the last gas outlet of first ammonia pipe is fixed and is provided with first cover body, the top both sides of first cover body are provided with two sets of first ammonia mouths that spout, the fixed two sets of kuppe that are provided with in upper end intermediate position of first cover body, the fixed guide plate that is provided with in lower extreme one side of kuppe on the first ammonia pipe that spouts. According to the utility model, ammonia gas sprayed out of the first ammonia spraying pipe diffuses towards two sides under the action of the guide cover, flue gas in a flue gas channel approaches to the guide cover under the action of the guide plate, the driving motor can drive the second ammonia spraying pipe to rotate, and the second ammonia spraying pipe can drive the ammonia spraying branch pipe to rotate, so that the ammonia gas is sprayed out of the ammonia spraying branch pipe while rotating, and the denitration effect is good. Because the temperature of the SCR denitration process is 180-400 ℃, and according to the current process flow (according to the process arrangement of SCR denitration after desulfurization), one of the key technologies of SCR denitration of sintering flue gas is to reheat the sintering flue gas, so that the temperature of the sintering flue gas is raised to the interval section required by SCR denitration reaction, after ammonia is mixed, the temperature of the mixture is too low, an ammonia air mixer and an ammonia injection port are easily blocked, ammonia cannot be injected into a reactor to react with the flue gas, and NOx is over-standard, so that a unit is forced to stop operation due to over-standard environmental protection indexes.

Disclosure of Invention

The utility model aims to provide an ammonia air dilution mixing device for flue gas denitration, which can increase the temperature in a box body through a fan and a heating plate, thereby preventing the phenomenon that ammonia cannot be sprayed into a reactor to react with flue gas due to the crystallization blockage of an ammonia spraying port when the temperature of ammonia air dilution mixture is too low, leading a unit to be forced to stop running due to the exceeding of environmental protection indexes, and can fully contact a reducing agent with the flue gas to prevent secondary pollution so as to solve the problems raised in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an empty mixing arrangement that dilutes of ammonia that flue gas denitration used, includes the box, installs the motor of box one side, and set up the motor bottom just installs the tobacco pipe that advances of box one side, the backup pad is installed to box one side, install the drum in the box, normal running fit has the dwang in the drum, dwang one end with the cover is equipped with the belt between the output of motor, drum week side cover is equipped with a plurality of fixed blocks, fixed block internal rotation fit has the axis of rotation, a plurality of the axis of rotation with one the dwang meshes mutually, fixed block downside normal running fit has the fan, fan one side with axis of rotation fixed connection, install the hot plate that is used for controlling the inside temperature of box between the box inner wall both sides.

Preferably, the heating plate comprises a supporting frame arranged between two sides of the inner wall of the box body, and a heating pipe arranged in the supporting frame. The passing heating pipe can prevent the ammonia air dilution mixture temperature from being too low, and the ammonia spraying port is blocked by crystallization, so that ammonia gas can not be sprayed into the reactor to react with flue gas, and the unit is forced to stop running due to exceeding environmental protection indexes.

Preferably, the ammonia conveyer pipe has been installed to box one side, normal running fit has first ammonia pipe that spouts between the box inner wall both sides, first ammonia pipe that spouts with the output fixed connection of motor, first ammonia pipe that spouts with ammonia conveyer pipe is connected, first ammonia pipe week side cover is equipped with a plurality of connecting pipes, a plurality of ammonia gas spouts the groove has been installed to connecting pipe one side, through ammonia conveyer pipe to make a plurality of ammonia gas spouts the groove with the reductant blowout, accelerate the dissolution of flue gas and reductant.

Preferably, a second ammonia spraying pipe is arranged between two sides of the inner wall of the box body, one end of the second ammonia spraying pipe is fixedly connected with one side of the ammonia conveying pipe, a plurality of first spray heads are arranged on the upper side of the second ammonia spraying pipe, and the second ammonia spraying pipe can be fully mixed with the flue gas.

Preferably, a plurality of arc baffles are arranged on the upper side of the second ammonia spraying pipe, a guide cover is arranged on the upper side of the first spray head, the arc baffles are sleeved on the periphery of the first spray head, and the guide cover and the arc baffles pass through the arc baffles, so that ammonia gas and flue gas are fully contacted.

Preferably, a third ammonia spraying pipe is arranged between two sides of the inner wall of the box body, the third ammonia spraying pipe is fixedly connected with one side of the ammonia conveying pipe, a plurality of second spray heads are arranged on one side of the third ammonia spraying pipe, flow control valves are respectively arranged on one sides of the first ammonia spraying pipe, the second ammonia spraying pipe and the third ammonia spraying pipe, and the flow control valves are used for passing through the first ammonia spraying pipe, so that the proportional stability of the ammonia air is improved.

Preferably, the lower side of the box body is provided with a plurality of supporting legs, the lower side of the box body is provided with a drain pipe, and the periphery of the drain pipe is provided with a first valve. The supporting leg that passes through to the stability of box has been improved, the first valve of passing through, thereby carries out the water secondary to the intraductal water use of drain.

Preferably, the exhaust pipe is arranged on the upper side of the box body, the second valve is arranged on the periphery of the exhaust pipe, and the second valve passes through the exhaust pipe, so that air pollution caused by gas discharged from the exhaust pipe is prevented.

By adopting the technical scheme, the embodiment of the utility model has the following advantages:

through the fan and the heating plate that set up, can make the temperature in the increase box to prevent that the empty dilution mixture temperature of ammonia that ends is too low, spout ammonia mouth crystallization and block up, cause ammonia unable to spout into in the reactor and react with the flue gas, lead to the unit to be forced out of service the event because of environmental protection index exceeds standard.

Through the ammonia gas spraying groove, the first spray head and the second spray head, the reducing agent can be sprayed out, and the motor enables the connecting pipe to rotate, so that the reducing agent can be fully mixed with the flue gas, the reducing agent can be fully contacted with the flue gas, and secondary pollution is prevented.

Drawings

FIG. 1 is a schematic diagram of an ammonia air dilution mixing apparatus according to an embodiment of the utility model;

FIG. 2 is a schematic diagram of a heating device according to an embodiment of the utility model;

FIG. 3 is a schematic view of a stirring and mixing device according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a fan according to an embodiment of the utility model;

in the figure: 1. a case; 2. a motor; 3. a support plate; 4. support legs; 5. a smoke inlet pipe; 6. an ammonia gas delivery pipe; 7. a drain pipe; 8. a first valve; 9. a second valve; 10. an exhaust pipe; 11. a belt; 12. a cylinder; 13. a fixed block; 14. heating pipes; 15. a support frame; 16. a first ammonia spraying pipe; 17. a second ammonia spraying pipe; 18. an arc baffle; 19. a guide cover; 20. a connecting pipe; 21. a first nozzle; 22. a flow control valve; 23. a second nozzle; 24. a fan; 25. a rotating shaft; 26. a rotating lever; 27. a third ammonia spraying pipe; 28. and (5) heating the plate.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-4, the present utility model provides a technical solution: the utility model provides an empty mixing arrangement that dilutes of ammonia that flue gas denitration used, including box 1, install motor 2 in box 1 one side, and set up in motor 2 bottom and install the tobacco pipe 5 that advances in box 1 one side, backup pad 3 has been installed to box 1 one side, be equipped with drum 12 in the box 1, drum 12 internal rotation cooperation has dwang 26, the cover is equipped with belt 11 between dwang 26 one end and motor 2's the output, drum 12 week side cover is equipped with a plurality of fixed blocks 13, fixed block 13 internal rotation cooperation has axis of rotation 25, a plurality of axis of rotation 25 mesh with a dwang 26, fixed block 13 downside normal running fit has fan 24, fan 24 one side and axis of rotation 25 fixed connection, be equipped with the hot plate 28 that is used for controlling box 1 inside temperature between the both sides, hot plate 28 includes the carriage 15 of installing between box 1 inner wall both sides, and install the heating pipe 14 in carriage 15.

In this embodiment, through the motor 2 that sets up, can make belt 11 and dwang 26 rotate, dwang 26 rotates and meshes with axis of rotation 25, makes axis of rotation 25 rotate and drives fan 24 and rotate to the steam that makes hot plate 28 produce is blown by fan 24 and is sent into box 1, increases the temperature in the box 1, prevents that the empty dilution mixed temperature of ammonia that ends is too low, spouts ammonia mouth crystallization and blocks up, causes ammonia unable to spout into in the reactor and react with the flue gas, leads to the unit to be forced out of service the incident because of environmental protection index exceeds standard.

As a further embodiment of the above technical solution: as shown in fig. 1 and 4, an ammonia gas conveying pipe 6 is installed on one side of the box body 1, a first ammonia spraying pipe 16 is in running fit between two sides of the inner wall of the box body 1, the first ammonia spraying pipe 16 is fixedly connected with the output end of the motor 2, the first ammonia spraying pipe 16 is connected with the ammonia gas conveying pipe 6, a plurality of connecting pipes 20 are sleeved on the periphery of the first ammonia spraying pipe 16, and a plurality of ammonia gas spraying grooves are installed on one side of the connecting pipes 20. Through the ammonia conveyer pipe 6 that sets up, can carry the reductant to first ammonia pipe 16 that spouts, when motor 2 rotates, drive first ammonia pipe 16 and rotate, first ammonia pipe 16 rotates and drives a plurality of connecting pipes 20 and rotate, thereby make a plurality of ammonia spout grooves spout the reductant, accelerate the dissolution of flue gas and reductant, second ammonia pipe 17 has been installed to the box 1 between the both sides, second ammonia pipe 17 one end and ammonia conveyer pipe 6 one side fixed connection have been installed to second ammonia pipe 17 upside, a plurality of first shower nozzles 21 have been installed. Through the second ammonia spraying pipe 17 that sets up, enable a plurality of first shower nozzles 21 to spout the reductant all around to can fully mix with the flue gas, a plurality of arc baffles 18 are installed to second ammonia spraying pipe 17 upside, and the kuppe 19 has been installed to first shower nozzle 21 upside, and arc baffles 18 cover is established in first shower nozzle 21 week side. Through kuppe 19 and arc baffle 18 that set up, carry out the in-process of spraying second ammonia spraying pipe 17 spacing to make ammonia and flue gas fully contact, installed the third between box 1 inner wall both sides and spouted ammonia pipe 27, third spouted ammonia pipe 27 and ammonia conveyer pipe 6 one side fixed connection, a plurality of second shower nozzles 23 have been installed to third ammonia pipe 27 one side, and first ammonia spraying pipe 16, second ammonia spraying pipe 17 and third ammonia spraying pipe 27 one side have installed flow control valve 22 respectively. By providing the flow control valve 22, the amount of the reducing agent discharged can be controlled, thereby improving the proportional stability of the ammonia void.

In this embodiment, a plurality of supporting legs 4 are installed on the lower side of the box 1, a drain pipe 7 is installed on the lower side of the box 1, and a first valve 8 is installed on the peripheral side of the drain pipe 7. Through the supporting leg 4 that sets up, can support box 1 to improved the stability of box 1, through the first valve 8 that sets up, can collect the water that ammonia air body mixes the formation in the box 1, thereby carry out the water secondary to in the drain pipe 7.

In this embodiment, the upper side of the case 1 is provided with an exhaust pipe 10, and the peripheral side of the exhaust pipe 10 is provided with a second valve 9. By providing the second valve 9, the ammonia space dilution gas in the tank 1 can be sealed, thereby preventing the gas from being discharged from the exhaust pipe 10 and causing air pollution.

The working principle of the utility model is as follows:

when flue gas needs to be filtered, flue gas is firstly introduced into the box body 1, the heating plate 28 and the motor 2 are started, the heating plate 28 preheats the box body 1, the motor 2 rotates to drive the belt 11 and the rotating rod 26 to rotate, the rotating rod 26 rotates to drive the rotating shaft 25 to rotate, the rotating shaft 25 rotates to drive the fan 24 to rotate, the fan 24 rotates to blow hot gas to the surfaces of the first ammonia spraying pipe 16, the second ammonia spraying pipe 17 and the third ammonia spraying pipe 27 to preheat, the ammonia conveying pipe 6 conveys the reducing agent into the first ammonia spraying pipe 16, the second ammonia spraying pipe 17 and the third ammonia spraying pipe 27 to spray the reducing agent, meanwhile, the motor 2 rotates to drive the first ammonia spraying pipe 16 to rotate, the first ammonia spraying pipe 16 rotates to drive the connecting pipe 20 to rotate, the reducing agent and the flue gas are prevented from being dissolved, the temperature in the box body 1 is too low, the reducing agent cannot be dissolved with the flue gas, and the NOx is prevented from exceeding standard, and the flue gas can be filtered.

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

Claims

1. The utility model provides an empty mixing arrangement that dilutes of ammonia that flue gas denitration used, includes box (1), installs motor (2) of box (1) one side, and set up motor bottom just installs advance tobacco pipe (5) of box (1) one side, its characterized in that: the utility model discloses a motor box, including box (1), backup pad (3) are installed to box (1) one side, be equipped with drum (12) in box (1), drum (12) internal rotation cooperation has dwang (26), dwang (26) one end with the cover is equipped with belt (11) between the output of motor (2), drum (12) week side cover is equipped with a plurality of fixed blocks (13), fixed block (13) internal rotation cooperation has axis of rotation (25), a plurality of axis of rotation (25) with one dwang (26) are engaged with, fixed block (13) downside normal running fit has fan (24), fan (24) one side with axis of rotation (25) fixed connection, install heating plate (28) that are used for controlling box inside temperature between the inner wall both sides of box (1).

2. The ammonia-air dilution mixing device for flue gas denitration according to claim 1, wherein: the heating plate (28) comprises a supporting frame (15) arranged between two sides of the inner wall of the box body (1), and a heating pipe (14) arranged in the supporting frame (15).

3. The ammonia-air dilution mixing device for flue gas denitration according to claim 1, wherein: the ammonia gas spraying device is characterized in that an ammonia gas conveying pipe (6) is arranged on one side of the box body (1), a first ammonia spraying pipe (16) is in running fit between two sides of the inner wall of the box body (1), the first ammonia spraying pipe (16) is fixedly connected with the output end of the motor (2), the first ammonia spraying pipe (16) is connected with the ammonia gas conveying pipe (6), a plurality of connecting pipes (20) are sleeved on the periphery of the first ammonia spraying pipe (16), and a plurality of ammonia gas spraying grooves are formed in one side of the connecting pipes (20).

4. An ammonia air dilution mixing device for flue gas denitration according to claim 3, wherein: a second ammonia spraying pipe (17) is arranged between two sides of the inner wall of the box body (1), one end of the second ammonia spraying pipe (17) is fixedly connected with one side of the ammonia conveying pipe (6), and a plurality of first spray heads (21) are arranged on the upper side of the second ammonia spraying pipe (17).

5. The ammonia-air dilution mixing device for flue gas denitration according to claim 4, wherein: a plurality of arc-shaped baffles (18) are arranged on the upper side of the second ammonia spraying pipe (17), a guide cover (19) is arranged on the upper side of the first spray head (21), and the arc-shaped baffles (18) are sleeved on the periphery of the first spray head (21).

6. The ammonia-air dilution mixing device for flue gas denitration according to claim 4, wherein: a third ammonia spraying pipe (27) is arranged between two sides of the inner wall of the box body (1), the third ammonia spraying pipe (27) is fixedly connected with one side of the ammonia conveying pipe (6), a plurality of second spray heads (23) are arranged on one side of the third ammonia spraying pipe (27), and flow control valves (22) are respectively arranged on one sides of the first ammonia spraying pipe (16), the second ammonia spraying pipe (17) and the third ammonia spraying pipe (27).

7. The ammonia-air dilution mixing device for flue gas denitration according to claim 4, wherein: the novel water tank is characterized in that a plurality of supporting legs (4) are arranged on the lower side of the tank body (1), a water draining pipe (7) is arranged on the lower side of the tank body (1), and a first valve (8) is arranged on the periphery of the water draining pipe (7).

8. The ammonia-air dilution mixing device for flue gas denitration according to claim 4, wherein: an exhaust pipe (10) is arranged on the upper side of the box body (1), and a second valve (9) is arranged on the periphery of the exhaust pipe (10).