Low-heating-value fuel gas air duct burner
By adopting the design of the gas collection chamber, inclined nozzle and central axial nozzle in the air duct burner, combined with the electric adjustment damper and pneumatic propulsion device, the problems of low-calorie gas ignition difficulties and flame instability are solved, and the gas stability is achieved Combustion and cost reduction, suitable for cold furnace starts in generator sets or heating units.
Patent Information
- Application Number
- CN202420781084.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-16
AI Technical Summary
When using low-calorie gas, the existing traditional air duct burners have difficulty ignition and unstable flame, which cannot meet the grinding temperature requirements of the generator set or heating unit.
A low-calorie gas duct burner is designed, using a main air spray gun with a gas chamber, an inclined nozzle and a central axial nozzle, combined with an electric damper, a pneumatic propulsion device and a combustion stabilization device to ensure uniform gas distribution and vertical ignition gun Pass through the outer wall of the air duct to improve ignition success rate and flame stability.
The stable ignition and flame control of low-calorie gas is achieved, which reduces operating costs, extends the service life of the equipment, fills the gap in the prior art, and makes low-calorie gas available for starting heating of cold furnaces of generator sets or heating units.
Smart Images
Figure CN222186942U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of burners, in particular to a low calorific value gas air duct burner suitable for primary air heating of various types of boilers. Background Art
[0002] The aggravation of the energy crisis worldwide and the implementation of mandatory environmental protection policies in various countries around the world have made all countries eager to seek a cheap and clean energy to replace oil and natural gas. The clean use of coal, especially the research on coal gasification, has been put on the agenda. With the continuous improvement of industrial users' requirements, coal gasification technology has developed to a certain extent. If a coal gasification technology wants to be widely used in actual production, it must have the characteristics of economy, environmental protection, and feasibility. There is no universal coal gasification furnace type and technology. Various coal gasification furnace types and gasification technologies have their own characteristics, advantages and disadvantages, and have their own adaptability to coal types and applicability to target products. In recent years, with the development of science and technology, the coal gasifier has combined the advantages of the above technologies and is closely related to the actual production situation. It has been widely used in industrial heating. Its energy-saving and environmental protection effects, cheapness, and heating performance have been fully recognized by the majority of industrial users. The widespread use of gas generators has greatly increased the output of gas from generators, but the calorific value of generator gas is relatively low. Its main components are CH4, CO, CO2, H2, and N2, with a calorific value of about 1300-1500kCal / Nm3.
[0003] Gasifier gas can be used for heating industrial kilns, such as: forging heating furnaces and heat treatment furnaces in the machinery industry; melting pools in the glass industry; tunnel kilns in the grinding wheel and refractory industry. Gasifier gas can also be used for smoke and dust removal in various boilers. Various industrial boilers, especially small and medium-sized boilers, have very serious smoke and dust production. In addition to continuously improving fuel methods and installing various high-efficiency dust removal equipment, using gasifier gas as fuel is one of the good methods recognized at home and abroad. In recent years, some power plant generators or heating units hope to use low calorific value fuel gas such as gasifier gas as fuel for heating the primary air when the unit is started from a cold furnace. Therefore, it is urgent to design a calorific value gas duct burner.
[0004] At present, the traditional duct burners used in power generation units and heating units use light diesel as the main fuel. Occasionally, there are duct burners that use natural gas as the main fuel, but there are no duct burners that use low calorific value gas as the main fuel. Traditional gas burners are only suitable for natural gas and other gases with a calorific value higher than 2000kcal / Nm3. When using low calorific value gas for ignition, there will be problems such as ignition difficulty and unstable flame. The primary air volume required for the start-up of the power generation unit or heating unit is large. If the flame stability cannot be guaranteed, it is impossible to ensure that the primary air temperature reaches the starting temperature required by the coal mill. Utility Model Content
[0005] Technical problem: The purpose of the utility model is to fill the gap in the prior art and provide a low calorific value gas duct burner with simple structure, low operating cost, high ignition success rate and stable flame.
[0006] Technical solution: To achieve the above-mentioned purpose, the utility model provides a low calorific value gas duct burner, comprising a mounting panel arranged on the primary air duct, an air distribution tube arranged in the primary air duct, a combustion stabilizing device, an ignition gun, a radiation protection tube and a support seat; the mounting panel is provided with an electric regulating damper, a main gas spray gun and an ignition gas gun at intervals, the air distribution tube is composed of a straight tube and a conical tube, the straight tube is open, and one end of the conical tube outlet is connected to the inlet end of the radiation protection tube; the electric regulating damper comprises an electric actuator, an actuator bracket, a baffle mounting shaft and an air regulating baffle, the air regulating baffle is arranged in one end of the straight tube opening of the air distribution tube, and is fixed by bolts and a baffle mounting shaft with one end inserted into the middle of the air regulating baffle, the opening of the air regulating baffle is electrically adjusted, and the other end of the baffle mounting shaft extends out of the primary air duct and is connected and fixed to the electric actuator arranged on the mounting panel, and the electric actuator is The actuator bracket is fixed on the mounting panel; the main gas spray gun is connected to the entrance of the radiation protection tube, and a stabilizing combustion device and an ignition gas gun are provided at the entrance of the radiation protection tube. One end of the ignition gas gun is provided with a mounting thread and is fixed outside the air duct through the mounting panel, connected to the gas pipeline through a metal hose, and the other end extends into the welded and fixed stabilizing combustion device. A flame detector and a vertically inserted ignition gun are obliquely provided on the side wall of the radiation protection tube. The ignition gun is connected and fixed to the pneumatic propulsion device. The ignition gun passes through the outer wall of the primary air duct and the wall of the radiation protection tube, and is perpendicular to the air flow direction in the primary air duct. The front end of the ignition gun extends into the low calorific value gas enrichment area near the nozzle of the main gas spray gun at the entrance of the radiation protection tube, and the pneumatic propulsion device drives the ignition gun forward or backward; the air distribution tube, the radiation protection tube and the support seat are welded and fixed, and the support legs of the support seat are welded and fixed to the primary air duct.
[0007] A coupling sleeve is arranged on the baffle installation shaft.
[0008] The main air spray gun includes a main air flange, an inlet pipeline, an air collecting chamber and multiple outlet pipelines; the air collecting chamber is arranged in an air distribution tube, one end of the inlet of the air collecting chamber is connected to the inlet pipeline, and one end of the outlet of the air collecting chamber is connected to multiple outlet pipelines, the multiple outlet pipelines extend into the inlet of the radiation protection tube, the inlet pipeline of the air collecting chamber and the multiple outlet pipelines are arranged at right angles, the multiple outlet pipelines include a central nozzle and multiple side nozzles evenly distributed around the central nozzle, the central nozzle head is welded with a central axial nozzle, and the heads of the multiple side nozzles are respectively welded with inclined nozzles inclined inwardly.
[0009] The number of the multiple outlet pipelines is 4 to 20; the number of the inclined nozzles is 4 to 20.
[0010] The combustion stabilizing device comprises a plurality of axial swirl blades arranged at the outlet to form an entrained airflow and a fixing ring welded and fixed on each axial swirl blade.
[0011] The number of the axial swirl blades is 8 to 16.
[0012] The ignition air gun is a self-priming ignition air gun which directly inhales the air flowing into the air distribution tube.
[0013] The pneumatic propulsion device comprises a support frame, an explosion-proof pneumatic propeller and a fixing seat, and an ignition gun clamp for fixing the ignition gun; the explosion-proof pneumatic propeller and the fixing seat are fixed to the support frame via flanges, and the ignition gun clamp is fixed to the explosion-proof pneumatic propeller and the fixing seat via bolts.
[0014] The length of the radiation protection tube is not less than 1000 mm, and the tube wall is provided with at least 5 circles of through holes with a diameter not less than 10 mm arranged in a circumferential radial manner in an alternating manner.
[0015] The flame detector is provided with a flame detector sleeve outside, which is welded and fixed to the mounting panel and inserted into the primary air duct at an inclined angle. The front end of the flame detector sleeve extends into the radiation protection tube and is welded and fixed to the radiation protection tube.
[0016] Beneficial effect: Due to the adoption of the above technical scheme, the low calorific value gas duct burner of the present invention has a main gas spray gun with a gas collection chamber, and is also provided with circumferentially evenly distributed inclined nozzles and a central axial nozzle, so that the gas is evenly distributed, the gas is enriched in the front area of the nozzle, it is easier to ignite, and the combustion is more stable. The gas inlet, electric actuator, pneumatic propulsion device and other equipment are all arranged on the side wall of the primary air duct, saving axial space and facilitating maintenance. The ignition gun passes through the outer wall of the air duct and the wall of the radiation-proof tube, the installation direction is perpendicular to the flow direction of the air flow in the air duct, and the front end extends into the low calorific value gas enrichment area, which improves the ignition success rate. After the ignition is successful, the pneumatic propulsion device can be controlled to exit the flame zone, which greatly prolongs the service life. This scheme fills the gap in the prior art, so that the generator set or heating unit can use low calorific value gas such as gas generator gas as the fuel for heating the primary air when the unit is started with a cold furnace. Compared with the prior art, some surplus low calorific value gas can be fully utilized, which reduces the complexity of the system and reduces the investment in operating costs. At present, it has been tested for long-term use in engineering projects with excellent results. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the main structure of the utility model.
[0018] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure viewed from above.
[0019] Figure 3 yes Figure 2 A schematic diagram of the partially enlarged structure of the central combustion stabilization device and the main gas spray gun and ignition gas gun nozzle positions.
[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the utility model without the air duct.
[0021] In the figure: 1-primary air duct, 2-installation panel, 3-air distribution tube, 4-combustion stabilization device, 5-electric regulating damper, 6-main air spray gun, 7-flame detector, 8-ignition air gun, 9-ignition gun, 10-pneumatic propulsion device, 11-radiation protection tube, 12-support seat, 13-flame detector sleeve, 4-1-swirl blade, 4-2 fixing ring, 5-1-electric actuator, 5-2-coupling sleeve, 5-3-actuator bracket, 5-4-baffle mounting shaft, 5-5-air regulating baffle, 6-1-main air flange, 6-2 inlet pipeline, 6-3-gas collecting chamber, 6-4 outlet pipeline, 6-5-central axial nozzle, 6-6-inclined nozzle. DETAILED DESCRIPTION
[0022] The present invention is further described below in conjunction with an embodiment in the accompanying drawings:
[0023] The utility model discloses a low calorific value gas duct burner, which is mainly composed of a mounting panel (2) arranged on a primary air duct (1), an air distribution tube (3) arranged in the primary air duct (1), a combustion stabilizing device (4), an ignition gun (9), a radiation protection tube (11) and a support seat (12); the mounting panel (2) is provided with an electric damper (5), a main gas spray gun (6) and an ignition gas gun (8) at intervals; the air distribution tube (3) is composed of a straight tube and a conical tube; the straight tube is open, and one end of the conical tube outlet is connected to the inlet end of the radiation protection tube (11); the electric damper (5) includes an electric actuator (5-1), an actuator bracket (5-3 ), a baffle mounting shaft (5-4) and an air regulating baffle (5-5), wherein the air regulating baffle (5-5) is arranged in one end of the straight opening of the air distribution tube (3), and is fixed by bolts and a baffle mounting shaft (5-4) with one end inserted into the middle of the air regulating baffle (5-5), and the opening of the air regulating baffle (5-5) is electrically adjusted, and the other end of the baffle mounting shaft (5-4) extends out of the primary air duct (1) and is connected and fixed to an electric actuator (5-1) arranged on the mounting panel (2), and the electric actuator (5-1) is fixed to the mounting panel (2) by an actuator bracket (5-3); a coupling sleeve (5-2) is provided on the baffle mounting shaft (5-4). The main gas spray gun (6) is connected to the inlet of the radiation protection tube (11), and the main gas spray gun (6) comprises a main gas flange (6-1), an inlet pipeline (6-2), a gas collecting chamber (6-3) and a plurality of outlet pipelines (6-4); the gas collecting chamber (6-3) is arranged in the air distribution tube (3), one end of the inlet of the gas collecting chamber (6-3) is connected to the inlet pipeline (6-2), one end of the outlet of the gas collecting chamber (6-3) is connected to the plurality of outlet pipelines (6-4), and the plurality of outlet pipelines (6-4) extend into the inlet of the radiation protection tube (11). In the inlet, the inlet pipeline (6-2) of the air collecting chamber (6-3) and the plurality of outlet pipelines (6-4) are arranged at right angles, the plurality of outlet pipelines (6-4) include a central nozzle and a plurality of side nozzles uniformly distributed around the central nozzle, the head of the central nozzle is welded with a central axial nozzle (6-5), and the heads of the plurality of side nozzles are respectively welded with inwardly inclined inclined nozzles (6-6); the number of the plurality of outlet pipelines (6-4) is 4 to 20; the number of the inclined nozzles (6-6) is 4 to 20. The inlet of the radiation protection tube (11) is provided with a stabilizing device (4) and an ignition air gun (8), the stabilizing device (4) includes a plurality of axial swirl blades (4-1) arranged at the outlet to form an entrained airflow and a fixing ring (4-2) welded and fixed on each axial swirl blade (4-1); the number of the axial swirl blades (4-1) is 8 to 16.One end of the ignition air gun (8) is provided with a mounting thread and is fixed outside the air duct through the mounting panel (2), connected to the gas pipeline through a metal hose, and the other end extends into the welded and fixed combustion stabilizing device (4). The ignition air gun (8) is a self-priming ignition air gun that directly inhales the air flowing into the air distribution tube (3). A flame detector (7) and a vertically inserted ignition gun (9) are obliquely arranged on the side wall of the radiation protection tube (11). A flame detector sleeve (13) is arranged outside the flame detector (7). The flame detector sleeve (13) is welded and fixed to the mounting panel (2) and inserted into the primary air duct (1) at an oblique angle. The front end of the flame detector sleeve (13) extends into the radiation protection tube (11) and is welded and fixed to the radiation protection tube (11). The ignition gun (9) is connected and fixed to the pneumatic propulsion device (10). The ignition gun (9) passes through the outer wall of the primary air duct (1) and the wall of the radiation protection tube (11), and is perpendicular to the flow direction of the airflow in the primary air duct (1). The length of the radiation protection tube (11) is not less than 1000 mm, and at least 5 circles of circumferential radially staggered through holes with a diameter of not less than 10 mm are opened on the tube wall. The front end of the ignition gun (9) extends into the low calorific value gas enrichment area near the nozzle of the main gas spray gun (6) at the entrance of the radiation protection tube (11), and the pneumatic propulsion device (10) drives the ignition gun (9) to move forward or backward; the pneumatic propulsion device (10) includes a support frame (10-1), an explosion-proof pneumatic propeller and a fixing seat (10-2), and an ignition gun clamp (10-3) for fixing the ignition gun (9); the explosion-proof pneumatic propeller and the fixing seat (10-2) are fixed to the support frame (10-1) via a flange, and the ignition gun clamp (10-3) is fixed to the explosion-proof pneumatic propeller and the fixing seat (10-2) via bolts. The air distribution tube (3), the radiation protection tube (11) and the support seat (12) are welded and fixed, and the support legs of the support seat (12) are welded and fixed to the primary air duct (1).
[0024] The fuel gas used in this embodiment can be low calorific value gas such as gasifier gas, blast furnace gas, converter gas, etc., or a mixed gas including high calorific value gas. The optimal settings of the number of circumferential arrangements of the inclined nozzles (20), the angle between the inclined nozzles (20) and the central axis, the number and size of openings on the inclined nozzles (20) and the central axial nozzles (22), and the rotation angle and number of the swirl blades in the embodiment need to be determined by calculation and numerical simulation based on low calorific value fuel gas of different qualities, in order to form a suitable mixing process and recirculation zone morphology as a principle, so as to ensure that the burner has a strong function of stable combustion and generating a low content of nitrogen oxides.
Claims
1. A low calorific value gas duct burner, characterized in that: It comprises a mounting panel (2) arranged on a primary air duct (1), an air distribution tube (3) arranged in the primary air duct (1), a combustion stabilizing device (4), an ignition gun (9), a radiation protection tube (11) and a support seat (12); the mounting panel (2) is provided with an electric damper (5), a main air spray gun (6) and an ignition air gun (8) at intervals; the air distribution tube (3) is composed of a straight tube and a conical tube; the straight tube is open, and one end of the conical tube outlet is connected to the inlet end of the radiation protection tube (11); the electric damper (5) comprises an electric actuator (5-1), an actuator (5-2) and an actuator (5-3). The air regulating baffle (5-5) is provided in one end of the straight opening of the air distribution tube (3), and is fixed by bolts and the baffle mounting shaft (5-4) with one end inserted into the middle of the air regulating baffle (5-5). The opening of the air regulating baffle (5-5) is electrically adjusted. The other end of the baffle mounting shaft (5-4) extends out of the primary air duct (1) and is connected and fixed to the electric actuator (5-1) provided on the mounting panel (2). The electric actuator (5-1) is connected to the actuator bracket (5-3). 3) is fixed on the mounting panel (2); the main gas spray gun (6) is connected to the inlet of the radiation protection tube (11), and a flame stabilizing device (4) and an ignition gas gun (8) are provided at the inlet of the radiation protection tube (11). One end of the ignition gas gun (8) is provided with a mounting thread and is fixed outside the air duct through the mounting panel (2), and is connected to the gas pipeline through a metal hose. The other end extends into the welded and fixed flame stabilizing device (4). A flame detector (7) and a vertically inserted ignition gun (9) are obliquely provided on the side wall of the radiation protection tube (11). The ignition gun (9) The ignition gun (9) is connected and fixed to the pneumatic propulsion device (10), and passes through the outer wall of the primary air duct (1) and the wall of the radiation protection tube (11), and is perpendicular to the flow direction of the airflow in the primary air duct (1). The front end of the ignition gun (9) extends into the low calorific value gas enrichment area near the nozzle of the main gas spray gun (6) at the entrance of the radiation protection tube (11), and the pneumatic propulsion device (10) drives the ignition gun (9) forward or backward; the air distribution tube (3), the radiation protection tube (11) and the support seat (12) are welded and fixed, and the support legs of the support seat (12) are welded and fixed to the primary air duct (1).
2. A low calorific value gas duct burner according to claim 1, characterized in that: The baffle installation shaft (5-4) is provided with a coupling sleeve (5-2).
3. A low calorific value gas duct burner according to claim 1, characterized in that: The main gas spray gun (6) comprises a main gas flange (6-1), an inlet pipeline (6-2), an air collecting chamber (6-3) and a plurality of outlet pipelines (6-4); the air collecting chamber (6-3) is arranged in the air distribution tube (3); one end of the inlet of the air collecting chamber (6-3) is connected to the inlet pipeline (6-2); one end of the outlet of the air collecting chamber (6-3) is connected to a plurality of outlet pipelines (6-4); the plurality of outlet pipelines (6-4) extend into the inlet of the radiation protection tube (11); the inlet pipeline (6-2) of the air collecting chamber (6-3) and the plurality of outlet pipelines (6-4) are arranged at right angles; the plurality of outlet pipelines (6-4) comprise a central nozzle and a plurality of side nozzles uniformly distributed around the central nozzle; a central axial nozzle (6-5) is welded to the head of the central nozzle; and inclined nozzles (6-6) inclined inwardly are respectively welded to the heads of the plurality of side nozzles.
4. A low calorific value gas duct burner according to claim 3, characterized in that: The number of the plurality of outlet pipelines (6-4) is 4 to 20; the number of the inclined nozzles (6-6) is 4 to 20.
5. The low calorific value gas duct burner according to claim 1, characterized in that: The combustion stabilization device (4) comprises a plurality of axial swirl blades (4-1) arranged at the outlet to form an entrained airflow, and a fixing ring (4-2) welded and fixed to each axial swirl blade (4-1).
6. A low calorific value gas duct burner according to claim 5, characterized in that: The number of the axial swirl blades (4-1) is 8 to 16.
7. The low calorific value gas duct burner according to claim 1, characterized in that: The ignition air gun (8) is a self-priming ignition air gun that directly inhales the air flowing into the air distribution tube (3).
8. The low calorific value gas duct burner according to claim 1, characterized in that: The pneumatic propulsion device (10) comprises a support frame (10-1), an explosion-proof pneumatic propeller and a fixing seat (10-2), and an ignition gun clamp (10-3) for fixing an ignition gun (9); the explosion-proof pneumatic propeller and the fixing seat (10-2) are fixed to the support frame (10-1) via a flange, and the ignition gun clamp (10-3) is fixed to the explosion-proof pneumatic propeller and the fixing seat (10-2) via bolts.
9. The low calorific value gas duct burner according to claim 1, characterized in that: The radiation protection tube (11) has a length of not less than 1000 mm, and has at least 5 circles of through holes with a diameter of not less than 10 mm arranged in a circumferential and radially staggered manner on the tube wall.
10. The low calorific value gas duct burner according to claim 1, characterized in that: The flame detector (7) is provided with a flame detector sleeve (13) on the outside. The flame detector sleeve (13) is welded and fixed to the mounting panel (2) and inserted into the primary air duct (1) at an inclined angle. The front end of the flame detector sleeve (13) extends into the radiation protection tube (11) and is welded and fixed to the radiation protection tube (11).