Low heat value pilot burner

Abstract

The application discloses a low-heat-value ignition burner, which comprises a burner shell, a gas spray gun, a combustion chamber and an ignition gun; the burner shell is provided with a combustion-supporting air flange interface and a panel-matching flange interface; one end of the gas spray gun is provided with a gas flange interface, and the other end is provided with a gas swirler and a throttle disc, and a plurality of gas injection holes are uniformly distributed on the throttle disc; the gas swirler outlet is provided with the combustion chamber, the combustion chamber has an expanding cone structure, and cooling holes are arranged on the outer wall of the expanding cone; a panel flange is arranged in the middle of the gas spray gun, the panel flange is used for fixing the gas spray gun and the burner shell through fixing bolts; an ignition gun guide pipe, a fire detection through hole and an observation through hole are arranged on the panel flange; the ignition gun guide pipe penetrates through the panel flange and the burner shell and extends to the combustion chamber; and the ignition gun is installed in the ignition gun guide pipe. The application overcomes the defects in the prior art, the ignition gun can directly ignite low-heat-value gas, the flame is stable and has good rigidity, and the problem of difficult ignition of low-heat-value gas is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and more specifically to a low-calorific-value gas ignition burner suitable for low-calorific-value gas boilers. Technical Background

[0002] Converter gas is a low-calorific-value fuel produced during steelmaking, mainly composed of CO and N2, with a calorific value of approximately 1400-1600 kcal / Nm3. It is an important secondary energy source for steel enterprises. In recent years, steel plants have gradually strengthened the recovery and utilization of converter gas and blast furnace gas, significantly reducing the input of primary energy sources such as coal and electricity through gas-fired power generation.

[0003] Traditional ignition burners are only suitable for natural gas, coke oven gas, and other gases with a calorific value higher than 2000 kcal / Nm3. When using converter gas for ignition, problems such as ignition difficulties and unstable flames occur. Currently, traditional ignition burners for gas boilers use high-calorific-value gases such as propane to ignite low-calorific-value main fuels. The burner ignition process is a two-stage ignition: ignition gun - ignition gas gun - main gas gun. Due to the structure of traditional ignition burners, the ignition gun cannot ignite low-calorific-value gases. The ignition gas gun and the main gas gun need to use two different fuels: the ignition gas gun uses a high-calorific-value fuel, and the main gas gun uses a low-calorific-value fuel. This requires an additional gas pipeline, thus increasing system complexity. Furthermore, low-calorific-value gases are generally byproducts of plant processes, while high-calorific-value gases need to be purchased separately, thus increasing project operating costs. Summary of the Invention

[0004] Technical problem: The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-calorific-value ignition burner that is simple in structure, reduces operating costs, is easy to ignite, and has a stable flame.

[0005] Technical Solution: The present invention provides a low-calorific-value ignition burner, comprising a burner shell, a gas nozzle, a combustion chamber, and an ignition gun. One end of the gas nozzle pipe section is connected to a gas flange interface via an elbow, and the other end is connected to the combustion chamber. A gas cyclone separator and a throttling plate are sequentially arranged inside the inlet of the gas nozzle and the combustion chamber. The gas cyclone separator is connected and fixed to the combustion chamber. Multiple axially penetrating gas nozzles are evenly distributed on the throttling plate. A panel flange is provided on the gas nozzle pipe section. The ignition gun is located inside the ignition gun guide tube, which passes through the panel flange and communicates with the combustion chamber. The ignition gun guide tube is parallel to the gas nozzle. The combustion chamber is fitted with a burner shell, which is fixed to the panel flange via a panel fitting flange. The burner shell and the gas nozzle are coaxially arranged. An auxiliary combustion air flange interface for connecting a combustion air duct is provided above the burner shell.

[0006] The gas cyclone is a cyclone composed of multiple axial blades forming a reflux zone at the outlet.

[0007] The density of the multiple axially penetrating gas nozzles evenly distributed on the throttling plate is determined based on the gas flow rate and gas pressure.

[0008] The combustion chamber includes a conical tube, an expanding conical transition tube, and a flame stabilizer connected in sequence. The conical tube has at least two rings of cooling holes on its conical surface, with each ring of cooling holes spaced apart. The flame stabilizer has at least one ring of combustion-supporting holes on its circumference, with each ring of combustion-supporting holes spaced apart.

[0009] The radial distance between the expansion cone transition tube and the flame stabilizer is 3-5 mm.

[0010] The burner housing is fixed to the panel flange via a panel mating flange and secured by fixing bolts. A sealing gasket is installed between the panel flange and the panel mating flange.

[0011] The panel flange is provided with a flame detection through hole for installing an ultraviolet light detection device and an observation through hole for installing an observation mirror.

[0012] Beneficial Effects: Due to the adoption of the above technical solution, the low-calorific-value ignition burner of this invention features a panel flange in the middle of the gas nozzle. The panel flange secures the gas nozzle to the burner housing using fixing bolts. The panel flange is equipped with an ignition gun guide tube, a flame detector through-hole, and an observation through-hole. The ignition gun guide tube passes through the panel flange and the burner housing, extending to the combustion chamber; the ignition gun is installed inside the ignition gun guide tube. This overcomes the shortcomings of existing technologies by using in-plant converter gas as fuel for the ignition burner, reducing the use of primary energy and solving the problems of difficult ignition and unstable flame when using low-calorific-value fuels in traditional burners. Compared with existing technologies, this saves investment, reduces system complexity, and lowers operating costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] Figure 2 for Figure 1 A schematic diagram of the right side view.

[0015] Figure 3 This is a three-dimensional structural schematic diagram of the present invention without showing the hidden burner housing.

[0016] Figure 4 This is a schematic diagram of the gas cyclone separator structure of the present invention.

[0017] In the diagram: 1-burner housing, 11-combustion air flange, 12-combustion air duct, 13-panel mating flange, 2-gas nozzle, 21-gas flange, 22-ignition gun guide tube, 23-panel flange, 24-sealing gasket, 25-throttling disc, 26-gas cyclone separator, 27-flame detector through hole, 28-observation through hole, 3-combustion chamber, 31-cone tube, 32-expanding cone transition tube, 33-flame stabilizer, 34-cooling hole, 35-combustion port, 4-ignition gun, 5-fixing bolt. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0019] A low-calorific-value ignition burner of the present invention mainly consists of a burner shell (1), a gas nozzle (2), a combustion chamber (3), and an ignition gun (4). One end of the gas nozzle (2) is connected to a gas flange (21) interface via an elbow, and the other end is connected to the combustion chamber (3). A gas cyclone separator (26) and a throttling plate (25) are sequentially arranged in the inlet of the gas nozzle (2) and the combustion chamber (3). The gas cyclone separator (26) is fixedly connected to the combustion chamber (3). Multiple axially penetrating gas nozzles are evenly distributed on the throttling plate (25). The density of the multiple axially penetrating gas nozzles evenly distributed on the throttling plate (25) is determined according to the gas flow rate and gas pressure. The gas cyclone separator (26) is a cyclone separator composed of multiple axial blades forming a reflux zone at the outlet. The gas cyclone separator (26) has multiple axial blades or changes the gas flow rate. The flow field forms a recirculation zone structure. The gas spray gun (2) has a panel flange (23) on its pipe section. The ignition gun (4) is located inside the ignition gun guide tube (22). The ignition gun guide tube (22) passes through the panel flange (23) and communicates with the combustion chamber (3). The ignition gun guide tube (22) is parallel to the gas spray gun (2). The combustion chamber (3) is fitted with a burner housing (1). The combustion chamber (3) includes a conical tube (31), an expanding conical transition tube (32), and a flame stabilizer (33) connected in sequence. The conical tube (31) has at least two rings of cooling holes (34) on its conical surface. The cooling holes are spaced apart in each ring. The flame stabilizer (33) has at least one ring of combustion-supporting holes (35) on its circumference. The combustion-supporting holes are spaced apart in each ring. During the use of the burner, the combustion-supporting air generates a film airflow through the gap to cool the flame stabilizer (33). The radial distance between the expansion cone transition tube (32) and the flame stabilizer (33) is 3-5 mm. The burner housing (1) is fixed to the panel flange (23) via the panel mating flange (13). The burner housing (1) is coaxially arranged with the gas spray gun (2). An auxiliary combustion air flange (11) interface for connecting the combustion air duct (12) is provided above the burner housing (1). The burner housing (1) is fixed to the panel flange (23) via the panel mating flange (13) by fixing bolts (5). A sealing gasket (24) is installed between the panel flange (23) and the panel mating flange (13). The panel flange (23) is provided with a flame detection through hole (27) for installing an ultraviolet light detection device and an observation through hole (28) for installing an observation sight glass. The flame detection through hole (27) is used to install an ultraviolet light detection device to detect the combustion situation in the combustion chamber. The observation through hole (28) is used to install an observation sight glass to visually observe the combustion situation.

Claims

1. A low-calorific-value ignition burner, comprising a burner housing (1), a gas injection gun (2), a combustion chamber (3), and an ignition gun (4), characterized in that: One end of the gas nozzle (2) is connected to a gas flange (21) via an elbow, and the other end is connected to the combustion chamber (3). A gas cyclone separator (26) and a throttling plate (25) are sequentially installed inside the inlet of the gas nozzle (2) and the combustion chamber (3). The gas cyclone separator (26) is fixedly connected to the combustion chamber (3). Multiple axially penetrating gas nozzles are evenly distributed on the throttling plate (25). A panel flange (23) is installed on the pipe section of the gas nozzle (2). The ignition gun (4) is located inside the ignition gun guide tube (22), which passes through the panel flange (23) and communicates with the combustion chamber (3). The ignition gun guide tube (22) is parallel to the gas nozzle (2). The combustion chamber... (3) Includes a conical tube (31), an expanding conical transition tube (32), and a flame stabilizer (33) connected in sequence; the combustion chamber (3) is fitted with a burner housing (1), the burner housing (1) is fixed on the panel flange (23) via a panel mating flange (13), the burner housing (1) is coaxially arranged with the gas spray gun (2), and an auxiliary combustion air flange (11) interface for connecting the combustion air duct (12) is provided above the burner housing (1); the burner housing (1) is fixed on the panel flange (23) via a panel mating flange (13) by fixing bolts (5), and a sealing gasket (24) is installed between the panel flange (23) and the panel mating flange (13).

2. A low-calorific-value ignition burner according to claim 1, characterized in that: The gas cyclone (26) is a cyclone composed of multiple axial blades forming a reflux zone at the outlet.

3. A low-calorific-value ignition burner according to claim 1, characterized in that: The throttling disc (25) has multiple axially penetrating gas nozzles with densities determined according to the gas flow rate and gas pressure.

4. A low-calorific-value ignition burner according to claim 1, characterized in that: The tapered tube (31) has at least two rings of cooling holes (34) on its tapered surface, with each ring of cooling holes spaced apart. The flame stabilizer (33) has at least one ring of combustion-supporting holes (35) on its circumference, with each ring of combustion-supporting holes spaced apart.

5. A low-calorific-value ignition burner according to claim 4, characterized in that: The radial distance between the expansion tapered transition tube (32) and the flame stabilizer (33) is 3-5 mm.

6. A low-calorific-value ignition burner according to claim 1, characterized in that: The panel flange (23) is provided with a flame detection through hole (27) for installing an ultraviolet light detection device and an observation through hole (28) for installing an observation mirror.

Images