Coaxial temperature return prevention burner

Abstract

The utility model discloses a coaxial temperature return prevention combustor which comprises a combustion-supporting air unit, a cooling unit and a waste gas unit. The cavities of the three units are coaxially arranged; a cooling water cavity is formed in the periphery of a plurality of waste gas nozzle pipelines of the waste gas unit; a combustion-supporting air cavity is arranged on the periphery of the cooling water cavity. The cooling unit, the combustion-supporting air unit and the waste gas unit are structurally matched, so that the temperature of waste gas is effectively reduced, and the temperature of the waste gas is lower than the ignition point; and when flame tempering occurs, the flame is extinguished due to low combustion temperature, so that an anti-tempering effect is achieved. Multiple combustion modes are integrated, combustion can be conveniently, flexibly and safely controlled, and gas with high concentration and high oxygen content is not premixed with oxygenating air; and the safety of the VOCs oil gas in the conveying process is realized through water-cooling temperature control.

Description

Technical Field

[0001] The utility model relates to the field of burners, in particular to a coaxial anti-return temperature burner. Background Art

[0002] The treatment method for waste gas in the VOCs industry is to reduce the oxygen content in VOCs or reduce the non-methane total hydrocarbon content of VOCs. Either of the two methods can meet the safety requirements, and control the safety of combustion by controlling the combustion-supporting materials and combustible materials respectively. However, the above two methods are difficult to meet the treatment of all VOCs waste gas, especially the treatment of high-concentration and high-oxygen content waste gas.

[0003] In order to solve the safety of flame combustion in the waste gas treatment industry, solve the manufacturing difficulty, reduce economic costs, and solidify the safety concept, the VOCs oil and gas treatment industry is in urgent need of a flame burner that can prevent heat transfer. Utility Model Content

[0004] Purpose of the utility model: In order to solve the problems of the prior art, the utility model provides a coaxial anti-return temperature burner, which will not transfer over-temperature to the front of the exhaust gas path for combustion when realizing flame combustion.

[0005] Technical solution: The utility model discloses a coaxial anti-return burner, comprising a combustion-supporting air unit, a cooling unit and an exhaust gas unit; the combustion-supporting air unit comprises a combustion-supporting air cavity, a combustion-supporting air inlet and a combustion-supporting air nozzle; the cooling unit comprises a cooling water cavity, a cooling water inlet and a cooling water outlet; the exhaust gas unit comprises an exhaust gas cavity, an exhaust gas inlet and an exhaust gas nozzle; the three cavities are coaxially arranged; the exhaust gas inlet is connected to the exhaust gas cavity, and a plurality of exhaust gas nozzles are connected above the exhaust gas cavity; the plurality of exhaust gas nozzles comprise a plurality of exhaust gas nozzle pipelines extending upward and an exhaust gas spray hole at the top; a cooling water cavity is arranged around the plurality of exhaust gas nozzle pipelines; a combustion-supporting air cavity is arranged around the cooling water cavity. When there is sufficient combustion-supporting air and the combustion temperature is sufficient, the gas is fully mixed and burned above the plurality of exhaust gas nozzles. The function of the cooling water cavity is to reduce the temperature of the exhaust gas so that the exhaust gas is below the ignition point. When flame flashback occurs, the flame is extinguished due to the low combustion temperature, which plays a role in preventing flashback.

[0006] Furthermore, the combustion-supporting air inlet is arranged on one side below the combustion-supporting air cavity and extends horizontally, the exhaust gas inlet is coaxially arranged facing the combustion-supporting air inlet, and the exhaust gas inlet passes through the outer wall of the combustion-supporting air cavity and is directly connected to the bottom of the exhaust gas cavity.

[0007] Furthermore, the cooling water inlet and cooling water outlet pass through the outer wall of the outer combustion-supporting air cavity to connect to the cooling water cavity and are arranged on both sides of the cooling water cavity; the cooling water inlet is arranged in the upper middle part of the cooling water cavity, and the cooling water outlet is arranged in the lower middle part of the cooling water cavity.

[0008] Furthermore, cooling water pipelines are provided at the top and the middle of the exhaust gas cavity, and a water pipe connection port for cooling water is provided in the middle, and a water pipe is connected to the water pipe connection port. The cooling water is supplied from the outside, and the cooling water and the exhaust gas perform heat exchange at the exhaust gas spray hole.

[0009] Furthermore, the interior of the exhaust gas cavity presents a curved surface structure of a venturi tube expansion section.

[0010] Furthermore, the multiple exhaust nozzle pipelines and the spray holes at the top are arranged in the venturi tube expansion section.

[0011] In order to make the exhaust gas have a certain flow rate, the exhaust gas is sprayed out from multiple exhaust gas nozzles to ensure that the flow rate is greater than the ignition speed of the flame. The diameter of the spray hole is 10-20mm; the length of the exhaust gas nozzle pipeline is 500-1000mm.

[0012] Furthermore, the combustion-supporting air cavity wraps the exhaust gas pipeline and the exhaust gas nozzle, the combustion-supporting air cavity is larger than the length of the exhaust gas nozzle pipeline, and the exhaust gas channel is led out from the combustion-supporting air cavity.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages: (1) It integrates multiple combustion modes in one, can conveniently, flexibly and safely control combustion, and realize high-concentration and high-oxygen gas without premixing with oxygen-supplementing air; and through water cooling temperature control, it realizes the safety of VOCs oil and gas transportation process; it is widely used in the treatment of high-concentration and high-oxygen waste gas in the petrochemical industry. (2) Through the coordinated setting of the cooling unit, the combustion-supporting air unit and the waste gas unit structure, the temperature of the waste gas is effectively reduced, so that the waste gas is below the ignition point; when the flame flashes back, the flame is extinguished due to the low combustion temperature, which plays a role in preventing flashback. (3). The utility model is a reverse application of the heat exchange burner, which has the function of preventing the flame from burning in the opposite direction of the combustible medium, that is, the performance of preventing backflow; it is a safety burner formed to reduce the heat transferred to the combustible medium, and reduce the heat released by the combustion directly transferred to the combustible waste gas raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the coaxial anti-regeneration burner of the utility model;

[0015] Figure 2 It is a schematic diagram of the top view of the coaxial anti-regeneration burner of the utility model. DETAILED DESCRIPTION

[0016] Embodiment 1:

[0017] like Figure 1-2 As shown, a coaxial anti-return burner described in the utility model includes a combustion air unit, a cooling unit and an exhaust gas unit;

[0018] The combustion-supporting air unit comprises a combustion-supporting air cavity 5, a combustion-supporting air inlet 1 and a combustion-supporting air nozzle 9;

[0019] The cooling unit comprises a cooling water cavity 7, a cooling water inlet 4 and a cooling water outlet 3;

[0020] The exhaust unit comprises an exhaust cavity 8, an exhaust inlet 2 and an exhaust nozzle 6;

[0021] The combustion air cavity 5, the cooling water cavity 7 and the exhaust gas cavity 8 are coaxially arranged;

[0022] The exhaust gas inlet 2 is connected to the exhaust gas cavity 8, and a plurality of exhaust gas nozzles 6 are connected above the exhaust gas cavity 8; the plurality of exhaust gas nozzles 6 include a plurality of exhaust gas nozzle pipelines extending upward and an exhaust gas spray hole at the top; a cooling water cavity 7 is provided around the plurality of exhaust gas nozzle pipelines; a combustion-supporting air cavity 5 is provided around the cooling water cavity 7. When there is sufficient combustion-supporting air and the combustion temperature is sufficient, the gas is fully mixed and burned above the plurality of exhaust gas nozzles 6. The function of the cooling water cavity 7 is to reduce the temperature of the exhaust gas so that the exhaust gas is below the ignition point. When flame flashback occurs, the flame is extinguished due to the low combustion temperature, which plays a role in preventing flashback.

[0023] The combustion-supporting air inlet 1 is arranged on one side below the combustion-supporting air cavity 5 and extends horizontally. The exhaust gas inlet 2 is coaxially arranged opposite to the combustion-supporting air inlet 1 to better prevent flow deviation. The exhaust gas inlet 2 passes through the outer wall of the combustion-supporting air cavity 5 and is directly connected to the bottom of the exhaust gas cavity 8.

[0024] The cooling water inlet 4 and the cooling water outlet 3 pass through the outer wall of the outer combustion-supporting air cavity 5 to communicate with the cooling water cavity 7 and are arranged on both sides of the cooling water cavity 7; the cooling water inlet 4 is arranged in the upper middle part of the cooling water cavity 7, and the cooling water outlet 5 is arranged in the lower middle part 7 of the cooling water cavity. Cooling water pipelines are arranged at the top and middle of the exhaust gas cavity 8, and a water pipe connection port for cooling water is arranged in the middle, and a water pipe is connected to the water pipe connection port. The cooling water is supplied from the outside, and the cooling water and the exhaust gas perform heat exchange at the exhaust gas nozzle.

[0025] The interior of the exhaust gas cavity 8 presents a curved structure of the expansion section of the Venturi tube. The multiple exhaust gas nozzle pipelines and the spray holes at the top are arranged in the expansion section of the Venturi tube. In order to allow the exhaust gas to have a certain flow rate, the exhaust gas is sprayed out from multiple exhaust gas nozzles to ensure that the flow rate is greater than the ignition speed of the flame. The diameter of the spray hole is 10-20mm; the length of the exhaust gas nozzle pipeline is 500mm. The combustion-supporting air cavity wraps the exhaust gas pipeline and the exhaust gas nozzle. The combustion-supporting air cavity is larger than the length of the exhaust gas nozzle pipeline, and the exhaust gas channel is led out from the combustion-supporting air cavity.

[0026] The coaxial anti-return burner described in this embodiment. The specific scope of use is the waste gas treatment of the VOCs industry. The waste gas contains alkanes, olefins, aromatics, aldehydes, ketones, alcohols, ethers, etc. Such VOCs are volatile and active in nature. They can participate in atmospheric photochemical reactions to produce harmful substances, causing great harm to the environment and humans. The coaxial anti-return burner of the utility model integrates multiple combustion methods in one, which can conveniently, flexibly and safely control combustion, and achieve high-concentration and high-oxygen gas without premixing with oxygen-supplementing air; and through water-cooling temperature control, the safety of VOCs oil and gas transportation can be achieved; it is widely used in the treatment of high-concentration and high-oxygen waste gas in the petrochemical industry.

[0027] The coaxial anti-return burner disclosed in the utility model has a combustion temperature of 760-900°C and a stable combustion. After combustion, the utility model can control the non-methane total hydrocarbon content in the waste gas treatment of the VOCs industry to 20-120 mg / m 3 , NOx is controlled at 40-80mg / m 3 .

[0028] The utility model effectively reduces the temperature of the exhaust gas by coordinating the cooling unit, the combustion-supporting air unit and the exhaust gas unit structure, so that the exhaust gas is below the ignition point; when flame flashback occurs, the flame is extinguished due to the low combustion temperature, thereby playing a role in preventing flashback.

[0029] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A coaxial anti-regeneration burner, characterized in that: It includes a combustion-supporting air unit, a cooling unit and an exhaust gas unit; the combustion-supporting air unit includes a combustion-supporting air cavity, a combustion-supporting air inlet and a combustion-supporting air nozzle; the cooling unit includes a cooling water cavity, a cooling water inlet and a cooling water outlet; the exhaust gas unit includes an exhaust gas cavity, an exhaust gas inlet and an exhaust gas nozzle; the three cavities are coaxially arranged; the exhaust gas inlet is connected to the exhaust gas cavity, and a plurality of exhaust gas nozzles are connected above the exhaust gas cavity; the plurality of exhaust gas nozzles include a plurality of exhaust gas nozzle pipelines extending upward and exhaust gas spray holes at the top; a cooling water cavity is arranged outside the plurality of exhaust gas nozzle pipelines; a combustion-supporting air cavity is arranged outside the cooling water cavity.

2. The coaxial anti-regeneration burner according to claim 1, characterized in that: The combustion-supporting air inlet is arranged on one side below the combustion-supporting air cavity and extends horizontally. The exhaust gas inlet is arranged coaxially with the combustion-supporting air inlet. The exhaust gas inlet passes through the outer wall of the combustion-supporting air cavity and is directly connected to the bottom of the exhaust gas cavity.

3. The coaxial anti-regeneration burner according to claim 1, characterized in that: The cooling water inlet and cooling water outlet pass through the outer wall of the outer combustion-supporting air cavity to be connected to the cooling water cavity and are arranged on both sides of the cooling water cavity; the cooling water inlet is arranged in the upper middle part of the cooling water cavity, and the cooling water outlet is arranged in the lower middle part of the cooling water cavity.

4. The coaxial anti-regeneration burner according to claim 1 or 3, characterized in that: Cooling water pipelines are provided at the top and the middle of the exhaust gas cavity, and a water pipe connection port for cooling water is provided in the middle, and a water pipe is connected to the water pipe connection port.

5. The coaxial anti-regeneration burner according to claim 1, characterized in that: The interior of the exhaust gas cavity is a venturi tube expansion section curved surface structure.

6. The coaxial anti-regeneration burner according to claim 5, characterized in that: The multiple exhaust gas nozzle pipelines and the spray holes at the top are arranged in the venturi tube expansion section.

7. The coaxial anti-regeneration burner according to claim 1, characterized in that: The diameter of the spray hole is 10-20 mm; the length of the exhaust gas nozzle pipeline is 500-1000 mm.

8. The coaxial anti-regeneration burner according to claim 1, characterized in that: The combustion-supporting air cavity wraps the exhaust gas pipeline and the exhaust gas nozzle. The combustion-supporting air cavity is larger than the length of the exhaust gas nozzle pipeline, and the exhaust gas channel is led out from the combustion-supporting air cavity.

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