CN209782615U

CN209782615U - High-efficiency ultralow-nitrogen combustor

Info

Publication number: CN209782615U
Application number: CN201920141254.3U
Authority: CN
Inventors: 裴韩佶
Original assignee: YANGZHOU STAR BOILER CO Ltd
Current assignee: YANGZHOU STAR BOILER CO Ltd
Priority date: 2019-01-28
Filing date: 2019-01-28
Publication date: 2019-12-13
Anticipated expiration: 2029-01-28

Abstract

The utility model discloses a high-efficient ultralow nitrogen combustor in the combustor technical field, including the mixing box, the mixing box front end is equipped with the air inlet and takes over, the air inlet is taken over and is connected with the air-blower air outlet, the mixing box front end cover is equipped with the preceding cover body, the rear end is connected with the back cover body, the part that the mixing box is located between the preceding cover body and the back cover body is the combustion part, the equipartition has the cloth wind hole on the combustion part, combustion part outside cover is equipped with even aerofoil, it has the finned tube to encircle cloth outside even aerofoil, the finned tube outside is equipped with ignition electrode, both ends communicate with the preceding cover body and back cover body respectively around the finned tube, be equipped with the coolant pipeline in the mixing box, coolant pipeline front end stretches out from the mixing box front end, coolant pipeline rear end and back cover body intercommunication. The utility model discloses a high-efficient ultralow nitrogen combustor does not have high expectations to air quality, and has and makes simply, low in manufacturing cost, advantages such as safe in utilization, energy-concerving and environment-protective.

Description

High-efficiency ultralow-nitrogen combustor

Technical Field

The utility model relates to a combustor, in particular to high-efficient ultralow nitrogen combustor.

Background

CompanyThe development of the society and the environmental problems are increasingly concerned by the international society. In China, the contradiction between energy supply and demand and environmental pollution is more and more prominent, and the frequency of acid rain generation is continuously increased, SO that the country pays more attention to the environmental protection industry, and the new flue gas emission standard reduces the smoke concentration and SO₂、NO_XAnd CO emission. Due to the increase of emission requirements and the large application of various fuel gases by national policies, the low NO is developed_XThe burner of (2) will become the need for energy saving and environmental protection.

To reach the national 30mg/Nm³Low NO_XEmissions, state of the art burners typically have two solutions: firstly, the conventional combustor is added with an FGR flue gas recirculation pipeline, but the cost of the combustor is greatly increased, the requirement on a boiler body or a fan is high, and the manufacturing and operating cost of the boiler is increased; and secondly, the surface full-premix burner is directly adopted, the price is high, and the metal fiber net is easy to block due to the problems of air quality, dust and the like, so that the phenomenon of burnout or deflagration occurs, and safety accidents occur, so that the national requirement of the structural type is not easy to be increased. In summary, the research and development of a burner which is low in cost, safe to use, energy-saving and environment-friendly is an urgent need of the market.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a cost is comparatively cheap, use safer and more energy-concerving and environment-protective high-efficient ultralow nitrogen combustor.

The purpose of the utility model is realized like this: the utility model provides a high-efficient ultralow nitrogen combustor, including the mixing box, the mixing box front end is equipped with the air inlet and takes over, the air inlet is taken over and is connected with the air-blower air outlet, the mixing box front end cover is equipped with the preceding cover body, the rear end is connected with the back cover body, the part that the mixing box is located between the preceding cover body and the back cover body is the combustion part, the equipartition has the cloth wind hole on the combustion part, the cover is equipped with even aerofoil outside the combustion part, even aerofoil outside ring cloth has the finned tube, the finned tube outside is equipped with ignition electrode, both ends communicate with the preceding cover body and back cover body respectively around the finned tube, be equipped with the coolant pipeline in the mixing box, coolant pipeline front end stretches out from the mixing box front end, coolant pipeline rear.

The utility model discloses a high-efficient ultralow nitrogen combustor, air and gas after mixing are taken over through the air inlet and are got into the mixing box and mix the back once more, pass the even wind hole on cloth wind hole and the even aerofoil on the mixing box combustion portion for air and gas can reach the full premix plane combustion requirement, then erode the finned tube with lower velocity of flow, and the gas mixture is after the finned tube space is seen off, mixes more fully, makes fuel can the intensive combustion. Meanwhile, a cooling medium (water or air) passes through the finned tube from the rear sleeve body to flow towards the front sleeve body to cool the finned tube, so that the service life of the finned tube is longer, the flame propagation speed is effectively reduced, tempering is prevented, and the flame is distributed on the surface of the finned tube, so that NO is reduced_XAnd (4) discharging. The utility model discloses a high-efficient ultralow nitrogen combustor is not high to air quality requirement, and has and makes simply, low in manufacturing cost, advantages such as safe in utilization, energy-concerving and environment-protective for the boiler can finally be with boiler NO_XThe emission concentration drops below 30mg/Nm 3.

As the utility model discloses a further improvement, even aerofoil surface equipartition has the deep bead, separates through the deep bead between the adjacent finned tube to reduce the clearance between the adjacent finned tube, thereby further reduce the mist velocity of flow, make the mist send out the back through the finned tube space, form mixed cross network structure, possess the full premix metal fiber net function.

As a further improvement, the fins on the finned tubes comprise flat body parts, the body parts are rectangular, trapezoidal, circular or polygonal, so as to further reduce the gaps between adjacent finned tubes, thereby reducing the flow rate of mixed gas, leading the mixing of air and gas to be more sufficient, improving the combustion efficiency, reducing NO_XAnd (5) discharging.

As a further improvement, the rectangular, trapezoidal or polygonal corner is provided with a chamfer, which is an inclined edge chamfer or an arc edge chamfer, thereby prolonging the time of the mixed gas passing through the finned tube, reducing the flow rate of the mixed gas and leading the mixing of the air and the gas to be more sufficient. The adoption of the arc-edge chamfer can further reduce the fin processing difficulty and improve the processing efficiency compared with the adoption of the bevel-edge chamfer.

As a further improvement of the utility model, the edge of the body part is provided with a folding edge, thereby reducing the clearance between the adjacent fins on the finned tube and further prolonging the time for the mixed gas to pass through the finned tube.

As the further improvement of the utility model, the cross sections of the air-homogenizing plate, the front sleeve body and the rear sleeve body are circular, square or polygonal, thereby increasing the flexibility of processing and manufacturing.

As a further improvement, the utility model is provided with even wind holes on the even wind plate, and the even wind holes are vertical long holes that a plurality of groups set up along the center shaft direction of the finned tube to further prolong the time that the mixed gas passes through the finned tube, make the mixture more abundant.

As a further improvement of the utility model, the front sleeve body is externally provided with a connecting flange which is connected with the boiler shell. Through setting up flange, can realize the quick reliable connection of combustor and boiler shell.

As a further improvement, the front end of the cooling medium pipeline is communicated with the water inlet or the cold air inlet, so that the finned tube can be cooled by water cooling or air cooling, and is convenient to use.

As a further improvement of the utility model, the front end of the cooling medium pipeline is communicated with the cold air inlet, and the cooling medium outlet is communicated with the air inlet of the air blower. Therefore, when the air-cooled finned tube mode is adopted, the cold air can be sent to the air blower again to be mixed with the fuel gas after being heated to 50-60 ℃, so that the combustion efficiency is improved, and the purposes of low nitrogen, environment protection and energy saving are achieved.

Drawings

Fig. 1 is a schematic diagram of the high-efficiency ultra-low nitrogen burner of the present invention.

FIG. 2 is a side view of the high efficiency ultra-low nitrogen burner shown in FIG. 1.

Fig. 3 is a side view of another embodiment of the high efficiency ultra low nitrogen burner of the present invention.

FIG. 4 is a schematic diagram of a top view of the finned tubes of the high efficiency ultra low nitrogen burner shown in FIG. 1.

Fig. 5 is an expanded view of the mixing box of the high efficiency ultra low nitrogen burner of the present invention.

Fig. 6 is an expanded view of the uniform air plate of the high-efficiency ultra-low nitrogen burner of the present invention.

The device comprises a mixing box 1, an air inlet connecting pipe 2, an air blower 3, a front sleeve body 4, a rear sleeve body 5, air distribution holes 6, an air homogenizing plate 7, a finned tube 8, a body part 8A, folded edges 8B, an ignition electrode 9, a cooling medium pipeline 10, a cooling medium outlet 11, a wind shield 12, an air homogenizing hole 13, a water inlet 14, a cold air inlet 15 and a connecting flange 16.

Detailed Description

The high-efficiency ultralow-nitrogen combustor shown in fig. 1 and 2 comprises a mixing box 1, wherein an air inlet connecting pipe 2 is arranged at the front end of the mixing box, the air inlet connecting pipe 2 is connected with an air outlet of a blower 3, a front sleeve body 4 is sleeved at the front end of the mixing box 1, a rear sleeve body 5 is connected at the rear end of the mixing box, a combustion part is arranged at the part of the mixing box 1 between the front sleeve body 4 and the rear sleeve body 5, air distribution holes 6 (shown in fig. 5) are uniformly distributed on the combustion part, an air distribution plate 7 is sleeved on the outer side of the combustion part, finned tubes 8 are annularly distributed on the outer side of the air distribution plate 7, ignition electrodes 9 are arranged on the outer sides of the finned tubes. The front end and the rear end of the finned tube 8 are respectively communicated with the front sleeve body 4 and the rear sleeve body 5, a cooling medium pipeline 10 is arranged in the mixing box 1, the front end of the cooling medium pipeline 10 extends out of the front end of the mixing box 1, the rear end of the cooling medium pipeline 10 is communicated with the rear sleeve body 5, and a cooling medium outlet 11 is arranged on the front sleeve body 4. The connecting flange 16 is arranged outside the front sleeve body 4, and the connecting flange 16 is used for being connected with the boiler shell.

As shown in FIG. 2, the mixing box 1, the air-distributing plate 7, the front sleeve 4 and the rear sleeve 5 (not shown) are all circular in cross section. The outer surface of the air uniformizing plate 7 is uniformly provided with air baffles 12, and the adjacent finned tubes 8 are separated by the air baffles 12 so as to reduce the gaps between the adjacent finned tubes. The air uniforming plate 7 is provided with air uniforming holes 13, and the air uniforming holes 13 are a plurality of groups of longitudinal long holes arranged along the central axis direction of the finned tube 8, as shown in fig. 6. The fins on the finned tubes 8 comprise flat body parts 8A, the body parts 8A are trapezoidal, gaps between adjacent finned tubes are further reduced, and arc-edge chamfers are arranged at four corners of each trapezoid. In order to reduce the gap between the adjacent fins on the finned tube 8 and further extend the time for the mixed gas to pass through the finned tube 8, the body portion 8A is also provided at both side edges thereof with folded edges 8B, as shown in fig. 4.

As shown in FIG. 1, the front end of the cooling medium pipeline 10 is communicated with the water inlet 14 or the cold air inlet 15, so that the finned tube 8 can be cooled by water cooling or air cooling. When the front end of the cooling medium pipeline 10 is communicated with the cold air inlet 15, the cooling medium outlet 11 is communicated with the air inlet of the blower 3. Therefore, the cold air can be sent to the air blower 3 again to be mixed with the fuel gas after being heated to 50-60 ℃, so that the combustion efficiency is improved, and the purposes of low nitrogen, environmental protection and energy saving are achieved.

The high-efficient ultralow nitrogen combustor of this embodiment, air and gas after the mixture take over 2 entering mixing box 1 after the remixing through the air inlet, pass even wind hole 13 on cloth wind hole 6 and the even aerofoil 7 on the combustion portion of mixing box 1, make air and gas can reach the full premix plane burning requirement, then separate back whole finned tube 8 (fin interval is less) that erodees through deep bead 12 with lower velocity of flow, make the mist send out the back through 8 spaces of finned tube, form mixed cross network structure, possess the full premix metal fiber net function, after the fuel fully burns, the burning forms the blue flame equipartition on the high temperature resistant stainless steel fin surface of finned tube. Meanwhile, a cooling medium (water or air) enters from the front end of the cooling medium pipeline 10, passes through the finned tube 8 from the rear sleeve body 5 and flows towards the front sleeve body 4 to cool the finned tube 8, so that the service life of the cooling medium is longer, the flame propagation speed is effectively reduced, and the tempering is prevented. The high-efficiency ultralow-nitrogen combustor has low requirements on air quality, has the advantages of simplicity in manufacturing, low manufacturing cost, safety in use, energy conservation, environmental protection and the like, and can be used for finally mixing NO with boiler when being used for boiler_XThe emission concentration drops below 30mg/Nm 3.

It should be noted that the high-efficiency ultra-low nitrogen burner of this embodiment may also have various modifications in implementation, for example, the cross sections of the air distribution plate 7, the front sleeve 4 and the rear sleeve 5 may also be square or polygonal. The fin body part 8A on the finned tube 8 can also be rectangular, circular or polygonal, when the body part 8A is rectangular or polygonal, the corners can also be provided with chamfers, the chamfers can be only arranged at two upper corners or two lower corners of the rectangle, and can also be arranged at all the corners of the rectangle or the polygon, and the chamfers can adopt arc-edge chamfers or bevel-edge chamfers. The folded edges on the finned tube 8 can adopt not only two folded edges shown in FIG. 4, but also four folded edges, six folded edges and eight folded edges. Fig. 3 shows a case that the cross sections of the air uniforming plate 7, the front sleeve 4 and the rear sleeve 5 adopt a square structure, at this time, the finned tubes 8 are also arranged in a square shape outside the air uniforming plate 7, and in this embodiment, the fin body portions 8A on the finned tubes 8 are rectangular with four corners having chamfered arc edges.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims

1. The utility model provides a high-efficient ultralow nitrogen combustor, includes the mixing box, the mixing box front end is equipped with the air inlet and takes over, the air inlet is taken over and is connected its characterized in that with the air-blower air outlet: the utility model discloses a cooling device, including the mixing box, the mixing box front end cover is equipped with the preceding cover body, the rear end is connected with the back cover body, the mixing box is located part between the preceding cover body and the back cover body is combustion portion, the equipartition has the cloth wind hole on the combustion portion, the combustion portion outside cover is equipped with even aerofoil, even aerofoil outside ring cloth has the finned tube, the finned tube outside is equipped with ignition electrode, around the finned tube both ends respectively with the preceding cover body and the back cover body intercommunication, be equipped with the coolant pipeline in the mixing box, the coolant pipeline front end is followed the mixing box front end is stretched out, coolant pipeline rear end with the back cover body intercommunication, be equipped with the coolant export on the preceding cover body.

2. The high efficiency ultra-low nitrogen burner of claim 1, wherein: and wind shields are uniformly distributed on the outer surfaces of the wind homogenizing plates, and adjacent finned tubes are separated by the wind shields.

3. The high efficiency ultra-low nitrogen burner of claim 1, wherein: the fins on the finned tubes include a flat body portion that is rectangular, trapezoidal, circular, or polygonal.

4. The high efficiency ultra-low nitrogen burner of claim 3, wherein: the corner of the rectangle, the trapezoid or the polygon is provided with a chamfer, and the chamfer is an inclined edge chamfer or an arc edge chamfer.

5. The high efficiency ultra-low nitrogen burner of claim 3, wherein: the edge of the body part is provided with a folded edge.

6. The high efficiency ultra-low nitrogen burner of claim 1, wherein: the cross sections of the air homogenizing plate, the front sleeve body and the rear sleeve body are circular, square or polygonal.

7. The high efficiency ultra-low nitrogen burner of claim 1, wherein: the air homogenizing plate is provided with air homogenizing holes, and the air homogenizing holes are a plurality of groups of longitudinal long holes arranged along the central axis direction of the finned tube.

8. the efficient ultralow nitrogen combustor as claimed in any one of claims 1 ~ 7, wherein a connecting flange is arranged outside the front sleeve body, and the connecting flange is connected with a boiler shell.

9. the efficient ultralow-nitrogen combustor according ~ any one of claims 1 ~ 7, wherein the front end of the cooling medium pipeline is communicated with a water inlet or a cold air inlet.

10. The high efficiency ultra-low nitrogen burner of claim 9, wherein: the front end of the cooling medium pipeline is communicated with the cold air inlet, and the cooling medium outlet is communicated with the air inlet of the blower.