CN216693528U

CN216693528U - Low NOx high-speed combustor

Info

Publication number: CN216693528U
Application number: CN202123419756.4U
Authority: CN
Inventors: 朱承业; 罗冉杰; 雷琦; 饶国刚
Original assignee: Hubei Shengyan Thermal Engineering Technology Co ltd
Current assignee: Hubei Shengyan Thermal Engineering Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-07
Anticipated expiration: 2031-12-31

Abstract

The utility model provides a low-NOx high-speed combustor which comprises a burner shell, a combustion chamber, an air gas nozzle and a gas pipe, wherein the burner shell is provided with an air inlet, the gas pipe penetrates through the burner shell, one end of the gas pipe is provided with the gas inlet, the other end of the gas pipe is connected with the air gas nozzle, the burner shell is connected with the combustion chamber through the air gas nozzle, and the air gas nozzle is provided with an air spray hole, a first gas spray hole and a second gas spray hole; the utility model integrates the air gas nozzle on one spray plate to ensure that the air gas is fully and crossly mixed, adopts the gun tube type low-power automatic ignition nozzle for ignition, and the detector can simultaneously detect the flames of the ignition nozzle and the main nozzle to ensure the continuous and stable combustion of the ignition nozzle and the main nozzle.

Description

Low NOx high-speed combustor

Technical Field

The utility model relates to the technical field of industrial furnace combustion facilities, in particular to a low-NOx high-speed combustor.

Background

Because some furnace bodies are relatively small, the heating furnace or the heat treatment furnace with higher requirements on furnace temperature control precision, furnace temperature uniformity, furnace oxidation or reducing atmosphere and the like is a better choice to use the high-speed combustor.

The gas of the high-speed combustor is combusted under high heat intensity, and the high-temperature flue gas generated after combustion is sprayed out of the combustion chamber at a very high speed (usually 200 and 300m/s), so that the convection heat transfer in the furnace is greatly enhanced, the heat uniformity in the furnace is facilitated, and meanwhile, the high-temperature and high-heat flue gas sprayed at a high speed is quickly diluted and cooled after being injected into the low-temperature flue gas in the furnace, so that the generation of NOx is inhibited; the high-speed combustor has a large load adjusting range, and can quickly reduce the load in advance before the temperature is close to the set temperature, so that the reduction of the thermal inertia in the furnace is facilitated; the high-speed combustor has wide regulation ratio range, and can regulate the oxidizing or reducing atmosphere in the furnace according to requirements.

The traditional high-speed burner has a plurality of limitations, for example, the traditional electrode discharge ignition and detection are adopted, the temperature of the combustion chamber is very high due to the ultrahigh volumetric heat intensity of the combustion chamber, the detection electrode in the flame is easy to burn, the electrode after burning is difficult to ignite, the ionic current is small, the fire detection is unstable, and the failure rate of the burner is high. In addition, a large amount of smoke generated by violent combustion reaction in the combustion chamber is flushed out at a high speed, and the combustion chamber made of the traditional high-aluminum castable is not resistant to scouring, is easy to crack and has a short service life.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a low-NOx high-speed combustor which is stable in combustion, long in service life and easy to realize automatic control.

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

the utility model provides a low-NOx high-speed combustor which comprises a burner shell, a combustion chamber, an air gas nozzle and a gas pipe, wherein the burner shell is provided with an air inlet, the gas pipe penetrates through the burner shell, one end of the gas pipe is provided with the gas inlet, the other end of the gas pipe is connected with the air gas nozzle, the burner shell is connected with the combustion chamber through the air gas nozzle, and the air gas nozzle is provided with an air spray hole, a first gas spray hole and a second gas spray hole.

Further, the first gas spray holes are dispersed outwards along the circumference in the range of the inner diameter of the gas pipe.

Further, the air injection holes are circumferentially inwardly convergent outside an outer diameter range of the gas pipe.

Furthermore, the second gas spray holes are distributed on the central circumference of the gas pipe at intervals.

Furthermore, the diameter of the second gas spray hole is 1mm to 2.5 mm.

Further, the combustion chamber is made of silicon carbide ceramic.

Further, an automatic ignition nozzle and a UV detector are arranged at the front end of the air and gas nozzle, and an included angle between the automatic ignition nozzle and the UV detector is 30-50 degrees.

The utility model has the beneficial effects that: 1) the air gas nozzles are integrated on one spray disk, so that the air gas is fully mixed in a cross way, and small gas holes are arranged near the air holes at the root of the flame, so that the stability of the flame is enhanced; 2) igniting by using a gun-barrel type low-power automatic ignition burner, and performing fire detection by using a UV detector, wherein the detector can simultaneously detect flames of the ignition burner and a main burner so as to ensure continuous and stable combustion of the ignition burner and the main burner; 3) thirdly, the combustion chamber is changed into silicon carbide ceramic, and the silicon carbide has higher temperature resistance, small thermal expansion coefficient, smooth surface and scouring resistance, thereby prolonging the service life of the combustor.

Drawings

FIG. 1 is a schematic view of a low NOx high velocity combustor according to the present invention;

FIG. 2 is a diagram of the relationship between the position of an ignition burner and a UV detector of a low NOx high velocity combustor in accordance with the present invention;

FIG. 3 is a top view of an air and gas burner head of a low NOx high velocity burner of the present invention;

FIG. 4 is a cross-sectional view of an air gas burner head of a low NOx high velocity burner of the present invention;

the numbers in the figures are as follows: 1. a gas inlet; 2. a gas pipe; 3. a burner housing; 31. an air inlet; 4. a gas shower nozzle; 41. air jet holes; 42. a first gas orifice; 43. a second gas orifice; 5. a combustion chamber; 6. an auto-ignition burner; 8. and a UV detector.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

Referring to fig. 1 to 4, the low NOx high-speed burner includes a burner housing 3, a combustion chamber 5, an air gas nozzle 4 and a gas pipe 2, wherein the burner housing 3 is provided with an air inlet 31, the gas pipe 2 penetrates through the burner housing 3, one end of the gas pipe 2 is provided with the gas inlet 1, the other end of the gas pipe is connected with the air gas nozzle 4, the burner housing 3 is connected with the combustion chamber 5 through the air gas nozzle 4, and the air gas nozzle 4 is provided with an air nozzle 41, a first gas nozzle 42 and a second gas nozzle 43.

The first gas spray holes 42 are circumferentially outwardly diverged within the inner diameter of the gas pipe 2.

The air injection holes 41 are circumferentially inwardly converged outside the outer diameter range of the gas pipe 2.

The second gas spray holes 43 are distributed at intervals on the central circumference of the gas pipe 2.

The diameter of the second gas spray holes 43 is between 1mm and 2.5 mm.

Specifically, the air gas nozzle 4 is integrally designed, and the air spray holes 41, the first gas spray holes 42 and the second gas spray holes 43 are positioned on the same spray plate. The gas pipe 2 is connected to the center of the air gas nozzle 4, generally 4-10 (according to the power) first gas spray holes 42 are diverged outwards along the circumference in the inner diameter size range of the gas pipe 2, namely the direction of spraying gas from the first gas spray holes 42 is far away from the circle center of the gas pipe 2 and flows into the combustion chamber 5, generally 5-16 (according to the power) air spray holes 41 are converged inwards along the circumference at the periphery of the outer diameter size of the gas pipe 2, namely the air spray direction from the air spray holes 41 faces the circle center of the gas pipe 2 and flows into the combustion chamber 5, and the included angle between the air spray holes and the combustion chamber is about 20-55 degrees, so that the air gas is fully mixed and rapidly combusted. Meanwhile, a plurality of second gas spray holes 43 with the diameter of 1-2.5 mm are arranged on the circumference of the center of each gas hole at intervals, and a small part of gas is guided to the vicinity of the air spray holes 41, so that the root of the flame can be stably combusted, and the stability of the whole flame is enhanced.

The combustion chamber 5 is made of silicon carbide ceramic.

Specifically, the combustion chamber 5 is made of silicon carbide and is sintered into ceramic at high temperature, all size transition positions are subjected to fillet treatment, the surface is smooth, the hardness and the strength are high, and the combustion chamber is embedded in high-aluminum casting materials and is positioned in front of the spray head. After the low-temperature flue gas in the furnace is injected by the flue gas ejected from the combustion chamber 5 at a high speed, the low-temperature flue gas is quickly diluted and is quickly cooled due to convection heat conduction, so that the generation of NOx is inhibited.

The front end of the air gas nozzle 4 is provided with an automatic ignition nozzle 6 and a UV detector 8, and the included angle between the automatic ignition nozzle 6 and the UV detector 8 is 30-50 degrees.

Specifically, an automatic ignition burner 6 and a UV detector 8 are arranged at the front end of the high-speed combustor air gas nozzle 4 by about 5-10 cm. The included angles of the axes of the automatic ignition burner 6 and the UV detector 8 and the central line of the combustor are 70-80 degrees, as shown in the figure, the central lines of the automatic ignition burner 6 and the UV detector are on the same conical surface and intersect on the central line of the combustor, the included angles of the automatic ignition burner 6 and the UV detector are 30-50 degrees, the distance between the intersecting lines of the automatic ignition burner and the UV detector at the outer wall of the silicon carbide combustion chamber 5 is 0-5 mm, and the UV detector can smoothly detect the flame of the ignition burner 6 through the inner hole of the UV tube 8.1.

When the furnace is started, the automatic ignition burner 6 is opened, the UV detector 8 monitors the flame of the ignition burner 6, and at the moment, the furnace body control system allows the main burner air-gas valve to be opened, namely the ignition burner 6 is burning, which is a necessary premise for opening the main burner air-gas valve. After the main burner is ignited, because the flames of the main burner and the ignition burner 6 are overlapped in the combustion chamber 5, the UV detector 8 actually monitors the flames of the ignition burner 6 and the main burner at the same time, so that only one of the main burner and the ignition burner is burnt, the other one of the main burner and the ignition burner cannot be extinguished, and the main burner and the ignition burner are in a mutual ignition linkage state. Only when the two are simultaneously extinguished and the UV detector 8 cannot monitor any flame, the furnace body control system can close the gas supply of the two, so that the safety is ensured. Such a design ensures stability and safety of combustion.

The working principle of the utility model is as follows: when the furnace is started, the automatic ignition burner 6 is turned on, the UV detector 8 monitors the flame of the ignition burner 6, the furnace body control system turns on a main burner air gas valve, and gas enters from the gas inlet 1, reaches the air gas nozzle 4 through the gas pipe 2 and enters the combustion chamber 5 from the

gas spray holes

42 and 43. Air enters from the air inlet 31, passes through the burner housing 3 to the air burner 4, and enters the combustion chamber 5 through the air injection holes 41. The air gas is fully mixed in the combustion chamber and is intensely combusted, and the generated flue gas is ejected out from the necking of the combustion chamber 5 at a high speed.

The above-mentioned embodiments only express the implementation manner of the present invention, and the description thereof is specific and detailed, but not to be understood as the limitation of the patent scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be defined by the appended claims.

Claims

1. The utility model provides a low NOx high-speed combustor, includes nozzle shell (3), combustion chamber (5), air coal gas shower nozzle (4) and gas pipe (2), its characterized in that: the burner is characterized in that an air inlet (31) is formed in the burner shell (3), the gas pipe (2) penetrates through the burner shell (3), one end of the gas pipe (2) is provided with a gas inlet (1), the other end of the gas pipe is connected with the air gas nozzle (4), the burner shell (3) is connected with the combustion chamber (5) through the air gas nozzle (4), and an air spray hole (41), a first gas spray hole (42) and a second gas spray hole (43) are formed in the air gas nozzle (4).

2. A low NOx high velocity combustor according to claim 1 wherein: the first gas spray holes (42) are circumferentially and outwardly divergent in the range of the inner diameter of the gas pipe (2).

3. A low NOx high velocity combustor according to claim 1 wherein: the air injection holes (41) are circumferentially inwardly convergent outside the outer diameter range of the gas pipe (2).

4. A low NOx high velocity combustor according to claim 2 wherein: the second gas spray holes (43) are distributed on the central circumference of the gas pipe (2) at intervals.

5. A low NOx high velocity combustor according to claim 4 wherein: the diameter of the second gas spray hole (43) is 1mm to 2.5 mm.

6. A low NOx high velocity combustor according to claim 4 wherein: the combustion chamber (5) is made of silicon carbide ceramic.

7. A low NOx high speed burner according to claim 4, wherein: an automatic ignition burner (6) and a UV detector (8) are arranged at the front end of the air gas nozzle (4), and an included angle between the automatic ignition burner (6) and the UV detector (8) is 30-50 degrees.