CN210833054U

CN210833054U - Air classification type low NOXHigh-speed burner

Info

Publication number: CN210833054U
Application number: CN201921914310.9U
Authority: CN
Inventors: 徐显慧; 司俊龙; 刘睿
Original assignee: Wuxi Tongrui Thermal Technology Co ltd
Current assignee: Wuxi Tongrui Thermal Technology Co ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-06-23
Anticipated expiration: 2029-11-07

Abstract

The utility model discloses a low NO of air classification type_XHigh velocity burner, said air staged low NO_XHigh-speed burnerThe burner comprises a burner body, a burner block, an air-fuel pipe and a backflow baffle; the backflow baffle is fixedly connected in the burner body through bolts, so that combustion-supporting air can be led into the combustion chamber in a grading manner, and high-temperature heat radiation in the combustion chamber can be blocked, and the problem that internal parts are easily damaged by high temperature is solved; the air-fuel pipe penetrates through the burner body, the top end of the air-fuel pipe penetrates through the backflow baffle, and the air-fuel pipe is used for transmitting natural gas and primary air required by combustion; burner block fixed connection in the top of burner body, and burner block still fixed connection is at the inner wall of high temperature kiln, burner block's special construction can the entrainment low oxygen content flue gas and get into high speed flame, reduces high speed flame's combustion temperature to reduce NO_XThe amount of production of (c).

Description

Air classification type low NOXHigh-speed burner

Technical Field

The utility model relates to a nozzle technical field, in particular to low NO of air classification type_XAnd (4) a high-speed burner.

Background

The flame outlet speed of the high-speed burner is 90-150m/s, and some flame outlet speeds are even as high as 200m/s, the high-speed burner belongs to a brand new combustion technology with high heating efficiency and good furnace temperature uniformity in the technical field of industrial heating, and the high-speed burner is widely applied to high-temperature furnaces such as aluminum melting furnaces, heat treatment furnaces and the like, and the convection heat exchange efficiency of the high-speed burner to a heating workpiece is estimated to be 4 times that of a common burner. Because the heat of convection is increased, the exhaust gas temperature can be effectively reduced, the heat loss is reduced, and the aim of better energy conservation is fulfilled; the high-speed burner can also improve the uniformity of the temperature in the furnace and shorten the time for uniform heating, and the temperature field distribution in the furnace is more uniform and the temperature difference is reduced due to the entrainment and stirring action of high-temperature hot air flow sprayed by the high-speed burner, so that the uniform heating time of a workpiece is shortened, the production efficiency is improved, and energy is saved.

The required gas pressure and combustion-supporting air inlet pressure of the existing high-speed burner are over 3.5kpa generally and even reach 7kpa due to structural design and material reasons, so that a high-pressure fan is required for supplying air, the power consumption is high, energy is wasted, the cost of various control valves of a gas pipeline is increased due to the higher gas inlet pressure, and the risk of gas leakage is increased; when the service temperature exceeds 1300 ℃, the gas nozzle and the air pipe of the burner are very easily damaged due to the direct influence of high-temperature and high-pressure combustion products in the combustion chamber, high-speed flame and heat radiation and heat transfer of smoke gas in the furnace, and the service life is short; the existing high-speed burner does not have a well-applied air classification technology, the NOx emission level is higher, and the requirement of current environmental protection on ultralow NOx emission cannot be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an air classification type hangs down NO_XThe high-speed burner aims to solve the problems that an existing high-speed burner is high in NOx generation amount, parts are easy to damage by high temperature and short in service life.

In order to solve the technical problem, the utility model provides an air classification type low NO_XThe high-speed burner comprises a burner body, a burner block, an air-fuel pipe and a backflow baffle;

the backflow baffle is fixedly connected in the burner body through bolts;

the air-fuel pipe penetrates through the burner body, the top end of the air-fuel pipe penetrates through the backflow baffle, and the air-fuel pipe is used for transmitting natural gas and primary air required by combustion;

the burner block is fixedly connected to the top end of the burner body, and is further fixedly connected to the inner wall of the high-temperature kiln.

Optionally, a combustion-supporting air port is formed in the burner body, and combustion-supporting air is blown into the burner body through the combustion-supporting air port by an external blower.

Optionally, the tail end of the air-fuel pipe is connected with a natural gas pipeline, a primary air pipe is arranged in the middle of the air-fuel pipe, and a part of the combustion-supporting air is used as the primary air and enters the air-fuel pipe from the primary air pipe to be mixed with natural gas.

Optionally, a mixing cavity is formed in the center of the backflow baffle and used for mixing natural gas with the primary air; and the backflow baffle is also provided with a plurality of combustion-supporting air diversion holes for diversion of the combustion-supporting air.

Optionally, a combustion chamber is formed in the burner block, a nozzle is formed at the tail end of the combustion chamber, and after the natural gas is violently combusted in the combustion chamber, high-speed flame is sprayed out from the nozzle.

Optionally, the combustion chamber is funnel-shaped, and can pressurize the high-speed flame, thereby increasing the flame speed.

Optionally, the high-speed flame is due toThe spraying speed is high, and a strong Venturi negative pressure effect can be formed at the front end of the burner block, so that low-oxygen-content flue gas in a high-temperature kiln is sucked into the high-speed flame, the combustion temperature of the high-speed flame is reduced, and NO is reduced_XThe amount of production of (c).

Optionally, an ignition gun and a flame detector are installed on the side wall of the burner block, and the ignition gun is used for forming ignition flame to ignite natural gas in the combustion chamber to form main flame.

Optionally, the flame detector includes ignition flame detector and main fire flame detector, ignition flame detector installs the end of burning torch, the central line with burning torch central line coincidence is used for monitoring at any time ignition flame guarantees ignition flame's security, and main fire flame detector is then installed the lateral part of burner block monitors at any time whether main flame exists, guarantees main flame's security.

The utility model provides a pair of air classification type low NO_XThe high-speed burner comprises a burner body, a burner block, an air-fuel pipe and a backflow baffle; the backflow baffle is fixedly connected in the burner body through bolts, combustion-supporting air can be led into the combustion cavity in a grading mode, the inlet pressure of gas and air required by the operation of the burner body is smaller than 2kpa, high-temperature heat radiation in the combustion cavity can be blocked, and therefore the problem that internal parts are easily damaged by high temperature is solved; the air-fuel pipe penetrates through the burner body, the top end of the air-fuel pipe penetrates through the backflow baffle, and the air-fuel pipe is used for transmitting natural gas and primary air required by combustion; burner block fixed connection in the top of burner body, and burner block still fixed connection is at the inner wall of high temperature kiln, burner block's special construction can the entrainment low oxygen content flue gas and get into high speed flame, reduces high speed flame's combustion temperature to reduce NO_XThe amount of production of (c).

Drawings

FIG. 1 is a view of the present invention, which provides an air classification type low NO_XA cross-sectional view of the high-velocity burner;

FIG. 2 is a view of the present invention, which provides an air-classified low NO_XThe structure schematic diagram of the high-speed burner backflow baffle.

Detailed Description

The present invention provides an air classification type low NO with reference to the attached drawings and the specific embodiments_XThe high velocity burner is described in further detail. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

The utility model provides an air classification type low NO_XThe structure of the high-speed burner is shown in figure 1, and the high-speed burner comprises a burner body 1, a burner block 2, an air-fuel pipe 3 and a backflow baffle 4; the backflow baffle 4 is fixedly connected in the burner body 1 through bolts; the air-fuel pipe 3 penetrates through the burner body 1, the top end part of the air-fuel pipe 3 penetrates through the backflow baffle 4, and the air-fuel pipe 3 is used for transmitting natural gas 31 and primary air 7 required by combustion; the burner block 2 is fixedly connected to the top end of the burner body 1, and the burner block 2 is also fixedly connected to the inner wall of the high-temperature kiln; a combustion-supporting air port 5 is formed in the burner body 1, and combustion-supporting air 8 is blown into the burner body 1 through the combustion-supporting air port 5 by an external blower; the tail end of the air-fuel air pipe 3 is connected with a natural gas pipeline, a primary air pipe 6 is arranged in the middle of the air-fuel air pipe, and one part of the combustion-supporting air 8 is used as the primary air 7 and enters the air-fuel air pipe 3 from the primary air pipe 6 to be mixed with natural gas.

Specifically, referring to fig. 1 and fig. 2, a mixing cavity 41 is formed in the center of the backflow baffle 4 for mixing the natural gas with the primary air 7; the backflow baffle 4 is also provided with a plurality of combustion-supporting air guide holes 42 for guiding the combustion-supporting air 8, so that the pressure of gas and air inlets required by the operation of the burner body 1 is less than 2kpa, a high-pressure fan is not required for air supply, energy is saved, the cost of various control valves on the air-fuel air pipe 3 is reduced due to the lower pressure of the gas inlets, the risk of gas leakage is also reduced, and meanwhile, the backflow baffle 4 can resist high-temperature heat radiation formed by combustion, so that the service life of the air-fuel air pipe 3 is prolonged; a combustion chamber 21 is formed in the burner block 2, a nozzle 22 is formed at the tail end of the combustion chamber 21, and after the natural gas is violently combusted in the combustion chamber 21, high-speed flame 9 is sprayed out of the nozzle 22; the combustion chamber 21 is funnel-shaped, and can pressurize the high-speed flame 9, thereby increasing the flame speed, the high-speed flame 9 can form a strong Venturi negative pressure effect at the front end of the burner block 2 due to high ejection speed, the generated negative pressure can effectively suck the low-oxygen content flue gas 10 in the high-temperature kiln to flow back to the vicinity of a flame outlet, these low oxygen content flue gases 10 are remixed with the air that has not been combusted, so that the oxygen content of the combustion air in this area can be further diluted and reduced, the intensity of the secondary combustion completed by the combustion-supporting air with low oxygen content and the residual fuel gas can be greatly reduced, the flame temperature is further reduced, the generation amount of NOx is effectively inhibited, and the reduction of the flame temperature has the additional benefit of effectively reducing the high-temperature thermal radiation damage of the flame to the burner body 1 part and being beneficial to delaying the service life of the burner body 1; burning torch and flame detector are installed to burner block 2 lateral walls, burning torch is used for forming ignition flame and ignites natural gas in the combustion chamber 21 forms main flame, flame detector includes ignition flame detector and main fire flame detector, ignition flame detector installs the end of burning torch, the central line with the coincidence of burning torch central line is used for monitoring at any time ignition flame ensures ignition flame's security, and main fire flame detector is then installed burner block 2's lateral part is monitored at any time whether main flame exists, ensures main flame's security.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims

1. Air classification type low NO_XThe high-speed burner is characterized by comprising a burner body (1), a burner block (2), an air-fuel pipe (3) and a backflow baffle (4);

the backflow baffle (4) is fixedly connected in the burner body (1) through bolts;

the air-fuel pipe (3) penetrates through the burner body (1), the top end part of the air-fuel pipe (3) penetrates through the backflow baffle (4), and the air-fuel pipe (3) is used for transmitting natural gas (31) and primary air (7) required by combustion;

the burner block (2) is fixedly connected to the top end of the burner body (1), and the burner block (2) is further fixedly connected to the inner wall of the high-temperature kiln.

2. An air-staged low NO filter as defined in claim 1_XThe high-speed burner is characterized in that a combustion-supporting air port (5) is formed in the burner body (1), and combustion-supporting air (8) is blown into the burner body (1) through the combustion-supporting air port (5) by an external air blower.

3. An air-staged low NO filter as defined in claim 2_XThe high-speed burner is characterized in that the tail end of the air-fuel pipe (3) is connected with a natural gas pipeline, a primary air pipe (6) is arranged in the middle of the air-fuel pipe, and one part of the combustion-supporting air (8) is used as the primary air (7) to enter the air-fuel pipe (3) from the primary air pipe (6) to be mixed with natural gas.

4. An air-staged low NO filter as defined in claim 3_XThe high-speed burner is characterized in that a mixing cavity (41) is formed in the center of the backflow baffle (4) and used for mixing natural gas with the primary air (7); the backflow baffle (4) is also provided with a plurality of combustion-supporting air guide holes (42) for guiding the combustion-supporting air (8).

5. An air-staged low NO filter as defined in claim 1_XThe high-speed burner is characterized in that a combustion chamber (21) is arranged in the burner block (2), and the tail end of the combustion chamber (21) is provided with a nozzle (2)2) After the natural gas is vigorously combusted in the combustion chamber (21), the high-speed flame (9) is sprayed out of the nozzle (22).

6. An air-staged low NO filter as defined in claim 5_XThe high-speed burner is characterized in that the combustion cavity (21) is funnel-shaped, and the high-speed flame (9) can be pressurized, so that the flame speed is improved.

7. An air-staged low NO filter as defined in claim 5_XThe high-speed burner is characterized in that the high-speed flame (9) is fast in ejection speed and can form a strong Venturi negative pressure effect at the front end of the burner block (2), so that low-oxygen-content flue gas (10) in a high-temperature kiln is sucked into the high-speed flame (9), the combustion temperature of the high-speed flame (9) is reduced, and NO is reduced_XThe amount of production of (c).

8. An air-staged low NO filter as defined in claim 5_XThe high-speed burner is characterized in that an ignition gun and a flame detector are mounted on the side wall of the burner block (2), and the ignition gun is used for forming ignition flame to ignite natural gas in the combustion cavity (21) to form main flame.

9. An air-staged low NO filter as defined in claim 8_XThe high-speed burner is characterized in that the flame detector comprises an ignition flame detector and a main flame detector, the ignition flame detector is installed at the tail end of an ignition gun, the central line of the ignition gun is overlapped with the central line of the ignition gun and used for monitoring the ignition flame at any time and ensuring the safety of the ignition flame, and the main flame detector is installed at the side part of the burner block (2) and used for monitoring whether the main flame exists or not at any time and ensuring the safety of the main flame.