CN215336281U

CN215336281U - Flue gas recirculation device capable of reducing nitrogen emission

Info

Publication number: CN215336281U
Application number: CN202121196014.7U
Authority: CN
Inventors: 董应民; 虞小明; 陈强; 沈光
Original assignee: Wuxi Huaguang Electric Power Engineering Co ltd
Current assignee: Wuxi Huaguang Electric Power Engineering Co ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-12-28
Anticipated expiration: 2031-05-31

Abstract

The utility model discloses a flue gas recirculation device capable of reducing nitrogen emission, which comprises a combustor, wherein a second guide pipe is fixedly installed at the upper end of the combustor, a heat exchange boiler is fixedly connected to the right end of the second guide pipe, a first guide pipe is fixedly connected to the right end of the heat exchange boiler, a purification device is fixedly connected to one side, away from the heat exchange boiler, of the first guide pipe, the left end of the purification device is fixedly connected with a chimney, a feeding pipe and a mixing pipe are respectively and fixedly installed at the left end of the combustor, an air inlet pipe is fixedly connected to the left end of the mixing pipe, an air preheater is fixedly connected to the middle of the air inlet pipe, and a circulation piece is fixedly connected to the middle of the first guide pipe and the lower end of the air inlet pipe together. According to the flue gas recirculation device for reducing nitrogen emission, the generation of nitrogen oxides in flue gas can be reduced through the circulation piece, and meanwhile sulfides and dust in the flue gas can be treated by using the purification device, so that the emission effect of the flue gas is improved, and the ecological environment is protected.

Description

Flue gas recirculation device capable of reducing nitrogen emission

Technical Field

The utility model relates to the technical field of flue gas treatment, in particular to a flue gas recirculation device for reducing nitrogen emission.

Background

1, the existing flue gas used for combustion often produces a large amount of nitrides, and the nitrides discharged into the air can cause serious pollution to the environment and bring threat to human survival; 2. a large amount of sulfide and combustion dust can be generated in the flue gas for combustion, and the acid rain phenomenon can occur when the flue gas is directly discharged into the atmosphere, so that the ecological environment is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a flue gas recirculation device for reducing nitrogen emission, which can effectively solve the problems in the background art.

In order to achieve the purpose, the utility model adopts the technical scheme that:

the utility model provides a reduce flue gas recirculation device that nitrogen discharged, includes the combustor, combustor upper end fixed mounting has No. two pipes, No. two pipe right-hand member fixedly connected with heat transfer boiler, No. one pipe of heat transfer boiler right-hand member fixedly connected with, one side fixedly connected with purifier of heat transfer boiler is kept away from to a pipe, purifier left end fixedly connected with chimney, the combustor left end is fixed mounting respectively has conveying pipe and hybrid tube, and the conveying pipe is located the hybrid tube top, hybrid tube left end fixedly connected with intake pipe, intake pipe middle part fixedly connected with air heater, the common fixedly connected with circulation piece of a pipe middle part and intake pipe lower extreme, the hybrid tube left part is a plurality of bent pipe structures.

Preferably, the circulation piece includes filtering piece, filter piece lower extreme fixedly connected with circulating pipe, the circulating pipe middle part respectively fixed mounting have governing valve and circulating pump, and the governing valve is located the circulating pump left end.

Preferably, one side of the circulating pipe, which is far away from the filtering piece, is fixedly connected with the lower end of the air inlet pipe, and the upper end of the filtering piece is fixedly connected with the middle part of the first guide pipe.

Preferably, air heater is including preheating the body, preheat body front end fixed mounting has the control box, control box front end fixed mounting has display screen and adjust knob respectively, and the display screen is located the adjust knob top, it has thermodetector to run through on the body to preheat, the control box respectively with thermodetector, display screen and adjust knob electric connection.

Preferably, purifier includes the purifying box, purifying box lower extreme middle part is run through there is the delivery pipe, the inside packing of purifying box has lime wash, purifying box upper portion fixed mounting has the drying net, the drying net middle part is inlayed and is equipped with the mounting panel, mounting panel lower extreme fixed mounting has the spacer, purifying box upper end middle part fixedly connected with conveyer pipe.

Preferably, the lower end of the spacer bush is lower than the liquid level of the lime water, the upper end of the discharge pipe is higher than the liquid level of the lime water, the upper end of the discharge pipe extends into the spacer bush, one side of the delivery pipe, which is far away from the purifying box, is fixedly connected with the right end of the chimney, and the lower end of the discharge pipe is fixedly connected with one side of the first guide pipe, which is far away from the heat exchange boiler.

Compared with the prior art, the utility model has the following beneficial effects:

(1) in the utility model, part of combustion flue gas in the first guide pipe enters the circulating pipe under the action of the circulating pump and is conveyed into the air inlet pipe through the circulating pipe, at the moment, combustion-supporting air with backflow flue gas is mixed through a plurality of bent pipes of the mixing pipe, and finally, the combustion operation of fuel is realized, and part of backflow flue gas is doped in the combustion-supporting air, so that the oxygen content in the combustor is limited, the combustor is combusted in a low-oxygen state, the combustion temperature is reduced along with the reduction of the combustion temperature, and the concentration of nitrogen oxides in the flue gas generated by combustion is reduced along with the reduction of the combustion temperature, so that the emission pressure is reduced; and the air preheater preheats the combustion air, so that the stability of the combustion process is ensured.

(2) According to the utility model, heat exchange flue gas is conveyed into the purification box through the first guide pipe and the first discharge pipe, the flue gas downwards extrudes the liquid level under the blocking effect of the spacer sleeve along with the continuous conveying of the flue gas in the purification box, so that the flue gas is fully contacted with lime water, sulfides and dust in the flue gas are removed, the contacted flue gas is finally discharged from the outer side of the spacer sleeve, and the flue gas is dried by the drying net and then discharged into a chimney through the conveying pipe, so that the sulfide treatment and dust treatment of the flue gas are realized, the emission effect of the flue gas is improved, and the ecological environment is protected.

Drawings

FIG. 1 is a schematic view of the overall configuration of a nitrogen emission reduction flue gas recirculation apparatus according to the present invention;

FIG. 2 is a schematic view of the structure of the circulating member of the flue gas recirculation apparatus for reducing nitrogen emissions according to the present invention;

FIG. 3 is a schematic diagram of an air preheater for a flue gas recirculation apparatus for reducing nitrogen emissions in accordance with the present invention;

fig. 4 is a schematic diagram showing the internal structure of a purification apparatus of a flue gas recirculation apparatus for reducing nitrogen emissions according to the present invention.

In the figure: 1. a mixing tube; 2. an air inlet pipe; 3. a circulating member; 4. an air preheater; 5. a purification device; 6. a burner; 7. a heat exchange boiler; 8. a first catheter; 9. a chimney; 10. a second catheter; 11. a feed pipe; 31. a filter member; 32. a circulation pipe; 33. a circulation pump; 34. adjusting a valve; 41. preheating the body; 42. a control box; 43. a display screen; 44. adjusting a knob; 45. a temperature detector; 51. a purification box; 52. lime water; 53. a discharge pipe; 54. a spacer sleeve; 55. drying the net; 56. a delivery pipe; 57. and (7) mounting the plate.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-4, a flue gas recirculation device for reducing nitrogen emission, including combustor 6, combustor 6 upper end fixed mounting has No. two pipes 10, No. two pipe 10 right-hand member fixedly connected with heat exchange boiler 7, No. one pipe 8 of heat exchange boiler 7 right-hand member fixedly connected with, one side fixedly connected with purifier 5 of heat exchange boiler 7 is kept away from to No. one pipe 8, purifier 5 left end fixedly connected with chimney 9, 6 left ends of combustor respectively fixed mounting have conveying pipe 11 and hybrid tube 1, and conveying pipe 11 is located hybrid tube 1 top, hybrid tube 1 left end fixedly connected with intake pipe 2, 2 middle part fixedly connected with air heater 4 of intake pipe, No. one the common fixedly connected with circulation piece 3 of pipe 8 middle part and 2 lower extremes of intake pipe, 1 left part of hybrid tube is a plurality of bent pipe structures.

The circulating part 3 comprises a filtering part 31, the lower end of the filtering part 31 is fixedly connected with a circulating pipe 32, the middle part of the circulating pipe 32 is respectively and fixedly provided with an adjusting valve 34 and a circulating pump 33, the adjusting valve 34 is positioned at the left end of the circulating pump 33, the oxygen content in the combustor 6 is limited by utilizing the low-oxygen characteristic of the returned flue gas, the combustor 6 is in combustion in a low-oxygen state, the combustion temperature is reduced along with the reduction of the nitrogen oxide concentration of the flue gas generated by the combustion; one side of the circulating pipe 32 far away from the filtering piece 31 is fixedly connected with the lower end of the air inlet pipe 2, and the upper end of the filtering piece 31 is fixedly connected with the middle part of the first guide pipe 8; the air preheater 4 comprises a preheating body 41, a control box 42 is fixedly installed at the front end of the preheating body 41, a display screen 43 and an adjusting knob 44 are respectively and fixedly installed at the front end of the control box 42, the display screen 43 is positioned above the adjusting knob 44, a temperature detector 45 penetrates through the upper end of the preheating body 41, the control box 42 is respectively and electrically connected with the temperature detector 45, the display screen 43 and the adjusting knob 44, the temperature detector 45 detects the temperature of the air in the preheating body 41, when the detected temperature reaches a preset temperature, the control box 42 controls the preheating body 41 to stop preheating work, the smooth preheating of combustion-supporting gas is ensured, and the smooth combustion of fuel in the combustor 6 is ensured; the purification device 5 comprises a purification box 51, a discharge pipe 53 penetrates through the middle of the lower end of the purification box 51, lime water 52 is filled in the purification box 51, a drying net 55 is fixedly installed on the upper portion of the purification box 51, an installation plate 57 is embedded in the middle of the drying net 55, a spacer 54 is fixedly installed at the lower end of the installation plate 57, a delivery pipe 56 is fixedly connected to the middle of the upper end of the purification box 51, along with continuous delivery of the flue gas in the purification box 51, the flue gas downwards extrudes the liquid level under the blocking effect of the spacer 54, so that the flue gas is fully contacted with the lime water 52, sulfides in the flue gas are removed, the contacted flue gas is finally discharged from the outer side of the spacer 54, and the flue gas is dried by the drying net 55 and then discharged into a chimney 9 from the delivery pipe 56; in order to realize the installation and connection of the purification device 5, the height of the lower end of the spacer 54 is lower than the liquid level of the lime water 52, the height of the upper end of the discharge pipe 53 is higher than the liquid level of the lime water 52, the upper end of the discharge pipe 53 extends into the spacer 54, one side of the delivery pipe 56, which is far away from the purification box 51, is fixedly connected with the right end of the chimney 9, and the lower end of the discharge pipe 53 is fixedly connected with one side of the first guide pipe 8, which is far away from the heat exchange boiler 7.

It should be noted that, when the recycling device is used, the combustion raw material is fed into the combustor 6 through the feeding pipe 11, simultaneously, the external combustion air is preheated through the air preheater 4, and then is conveyed through the air inlet pipe 2, so as to realize the combustion operation of the fuel in the combustor 6, the flue gas generated by the combustion is conveyed into the heat exchange boiler 7 through the second conduit 10 for heat exchange operation, the flue gas after the heat exchange treatment is conveyed into the purifying box 51 through the first conduit 8 and the discharge pipe 53, along with the continuous conveyance of the flue gas in the purifying box 51, the flue gas extrudes downwards the liquid level under the blocking effect of the spacer 54, so that the flue gas fully contacts with the lime water 52, so as to remove the sulfides in the flue gas, and the flue gas after the contact is finally discharged from the outer side of the spacer 54, and is dried through the drying net 55 and then discharged into the chimney 9 from the conveying pipe 56, the sulfide treatment and the dust treatment of the flue gas are realized, the emission effect of the flue gas is improved, meanwhile, part of the flue gas in the first guide pipe 8 enters the circulating pipe 32 under the action of the circulating pump 33 and is conveyed into the air inlet pipe 2 through the circulating pipe 32, the combustion-supporting air with the circulating flue gas is mixed through a plurality of bends of the mixing pipe 1, the combustion operation of the fuel is finally realized, part of backflow flue gas is doped in the combustion-supporting air, so that the oxygen content in the combustor 6 is limited, the combustor 6 is in a low-oxygen state, the combustion temperature is reduced, the concentration of nitrogen oxides in the flue gas generated by combustion is reduced, and the emission pressure is reduced.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A flue gas recirculation device with reduced nitrogen emissions, comprising a burner (6), characterized in that: a second guide pipe (10) is fixedly arranged at the upper end of the burner (6), the right end of the second guide pipe (10) is fixedly connected with a heat exchange boiler (7), a first guide pipe (8) is fixedly connected at the right end of the heat exchange boiler (7), a purifying device (5) is fixedly connected at one side of the first guide pipe (8) far away from the heat exchange boiler (7), the left end of the purification device (5) is fixedly connected with a chimney (9), the left end of the combustor (6) is respectively and fixedly provided with a feeding pipe (11) and a mixing pipe (1), the feeding pipe (11) is positioned above the mixing pipe (1), the left end of the mixing pipe (1) is fixedly connected with an air inlet pipe (2), intake pipe (2) middle part fixedly connected with air heater (4), the common fixedly connected with circulation piece (3) of a pipe (8) middle part and intake pipe (2) lower extreme, hybrid tube (1) left part is a plurality of bent pipe structures.

2. The flue gas recirculation apparatus for reducing nitrogen emissions according to claim 1, wherein: circulation piece (3) are including filtering piece (31), filter piece (31) lower extreme fixedly connected with circulating pipe (32), circulating pipe (32) middle part respectively fixed mounting have governing valve (34) and circulating pump (33), and governing valve (34) are located circulating pump (33) left end.

3. A flue gas recirculation apparatus for reducing nitrogen emissions according to claim 2, wherein: one side of the circulating pipe (32) far away from the filtering piece (31) is fixedly connected with the lower end of the air inlet pipe (2), and the upper end of the filtering piece (31) is fixedly connected with the middle part of the first guide pipe (8).

4. The flue gas recirculation apparatus for reducing nitrogen emissions according to claim 1, wherein: air heater (4) are including preheating body (41), preheat body (41) front end fixed mounting has control box (42), control box (42) front end fixed mounting respectively has display screen (43) and adjust knob (44), and display screen (43) are located adjust knob (44) top, it has thermodetector (45) to run through on preheating body (41), control box (42) respectively with thermodetector (45), display screen (43) and adjust knob (44) electric connection.

5. The flue gas recirculation apparatus for reducing nitrogen emissions according to claim 1, wherein: purifier (5) include purifying box (51), purifying box (51) lower extreme middle part is run through and is had delivery pipe (53), purifying box (51) inside packing has lime wash (52), purifying box (51) upper portion fixed mounting has drying net (55), drying net (55) middle part is inlayed and is equipped with mounting panel (57), mounting panel (57) lower extreme fixed mounting has spacer (54), purifying box (51) upper end middle part fixedly connected with conveyer pipe (56).

6. The flue gas recirculation apparatus for reducing nitrogen emissions according to claim 5, wherein: the height of the lower end of the spacer bush (54) is lower than the liquid level of the lime water (52), the height of the upper end of the discharge pipe (53) is higher than the liquid level of the lime water (52), the upper end of the discharge pipe (53) extends into the spacer bush (54), one side, away from the purification box (51), of the delivery pipe (56) is fixedly connected with the right end of the chimney (9), and the lower end of the discharge pipe (53) is fixedly connected with one side, away from the heat exchange boiler (7), of the first guide pipe (8).