A simple large-flux direct-fired waste gas environmental protection treatment device

Abstract

The present invention relates to a simple large-flux direct-fired waste gas environmental protection treatment device, including a shell, a combustion chamber is arranged in the center of the shell, the top of the combustion chamber is connected to the exhaust pipe, the gap between the combustion chamber and the inner wall is a preheating channel, the preheating channel is connected to the air inlet, and a burner is arranged at the bottom of the combustion chamber; the first waste gas overfire cage, the second waste gas overfire cage, and a U-shaped heat storage body are arranged in sequence from bottom to top in the combustion chamber. The present invention has low cost and simple structure, omits the concentration link and the catalytic link, has a large waste gas flux and a large preheating space, and the waste gas is fully cut and rotated by the stainless steel wire filler in the combustion chamber to achieve complete decomposition, which greatly improves the overfire decomposition efficiency of the waste gas, and achieves that the emission concentration after waste gas treatment is lower than the national emission standard, while greatly reducing the cost expenditure and gas consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection equipment, and specifically relates to a simple and large-flux direct-combustion exhaust gas environmental protection treatment device. Background Art

[0002] Incineration is a very effective method for treating organic waste gas, highly toxic gas, and malodorous gas. Its principle is to use high heat to directly oxidize and decompose harmful substances in the waste gas, such as oxidizing organic matter into CO2 and H20. In order to save incineration costs, regenerative thermal combustion (RTO) and catalytic combustion (CO) processes are often used in daily production.

[0003] The existing thermal storage combustion (RTO) incinerator and catalytic combustion (CO) incinerator all adopt the reversing thermal storage method, which is too complicated. In the reversing process, it is easy for the exhaust gas to be discharged directly from the incinerator into the atmosphere without being treated along with the reverse airflow. The exhaust gas treatment emission does not meet the standard. In addition, the exhaust gas treatment also requires concentration and catalytic steps, which has high treatment costs and large energy consumption. Summary of the invention

[0004] The present invention mainly provides a large-flow direct-fired exhaust gas environmental protection treatment device, which has low cost and simple structure, omits the concentration link and the catalytic link, and the exhaust gas rotates and overfires fully in the furnace, which greatly improves the exhaust gas overfire purification efficiency, and achieves the emission concentration of the exhaust gas after treatment is lower than the national emission standard, while greatly reducing cost expenditure and gas consumption.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A simple large-flux direct-fired exhaust gas environmental protection treatment device comprises a shell, the shell is a hollow structure, the inner wall of the shell is provided with a heat preservation layer, the top side of the shell is provided with an air intake pipe, the center of the shell is provided with a combustion chamber, the combustion chamber is a hollow structure with an opening at the bottom, and is made of stainless steel. The top of the combustion chamber is connected to the exhaust pipe, and the exhaust pipe passes through the top of the shell. The vacancy between the combustion chamber and the inner wall is a preheating channel, and the preheating channel is connected to the air intake pipe. A burner is provided at the bottom of the combustion chamber, and the burner is connected to a natural gas pipeline. The burner is It consists of a raised long flame burner in the middle and a short flame burner at the bottom; the inside of the combustion chamber is provided with a first exhaust gas overfire cage, a second exhaust gas overfire cage, and a U-shaped heat storage body from bottom to top. The first exhaust gas overfire cage and the second exhaust gas overfire cage are composed of a stainless steel bracket and a mesh, and stainless steel wire filler is arranged inside the cage. The first exhaust gas overfire cage is arranged at the bottom of the combustion chamber and above the burner. The U-shaped heat storage body opens downward and is fixed in the combustion chamber by a bottom integrated bracket. The second exhaust gas overfire cage is embedded in the hollow part of the U-shaped heat storage body.

[0007] The present application adopts a combustion chamber built in a shell, wherein a first exhaust gas overfire cage, a second exhaust gas overfire cage, and a U-shaped heat storage body are arranged in the combustion chamber, and the gap between the combustion chamber and the shell is used as a preheating channel. The U-shaped heat storage body stores heat while keeping the second exhaust gas overfire cage warm and providing heat for the preheating channel;

[0008] The outer wall of the combustion chamber is provided with heat dissipation fins to provide heat to the preheating channel and improve the exhaust gas preheating efficiency;

[0009] The stainless steel wire filler is formed by winding a spring-shaped spiral steel wire and has the plasticity to be stretched and compressed according to the shape of the cage; the cage heights of the first exhaust gas overfire cage and the second exhaust gas overfire cage and the wire thickness and gap density of the stainless steel wire filler are adjusted according to the actual exhaust gas flow, concentration and flame combustion amplitude.

[0010] The melting point of stainless steel is 1399-1455°C, and it can be used as the material of the combustion chamber and the first exhaust gas overfire cage and the second exhaust gas overfire cage.

[0011] Furthermore, the flame of the short flame burner is higher than the first exhaust gas overfire cage, and the flame of the long flame burner is higher than the bottom of the second exhaust gas overfire cage. The first exhaust gas overfire cage is a hollow cylinder. The long flame burner passes through the middle of the exhaust gas, and after the exhaust gas passes through the flame area for initial thermal decomposition, it passes through the wire cage area for full division and rotation for thermal decomposition.

[0012] In this scheme, the short flame burner is used to burn the first exhaust gas overfire cage for the first combustion purification, and the long flame burner is used to burn the second exhaust gas overfire cage for the second combustion purification and to provide heat for the U-shaped heat storage body and the preheating channel.

[0013] Furthermore, two reversing heat storage bodies are provided between the shell and the intake pipe and the exhaust pipe. The intake pipe and the exhaust pipe are connected to the two reversing heat storage bodies through an airflow reversing device. The reversing heat storage bodies are connected to the intake port and the exhaust port on the shell through the airflow reversing device. The intake port is connected to the preheating channel, and the exhaust port is connected to the top of the combustion chamber. The airflow reversing device allows the exhaust gas to enter any one of the reversing heat storage bodies from the intake pipe and then enter the intake port, and the clean gas enters the other reversing heat storage body from the exhaust port and then enters the exhaust pipe.

[0014] Furthermore, the U-shaped heat storage body is made of ceramic material.

[0015] Furthermore, a diverter is provided on the top side of the combustion chamber corresponding to the air inlet pipe, which is used to divert the exhaust gas into the preheating channel.

[0016] Furthermore, a conical cavity is provided at the bottom of the second exhaust gas overfire cage, and the flame of the long flame burner penetrates into the conical cavity, so that the stainless steel wire filler in the cage is evenly ignited.

[0017] Furthermore, a VOC detection device is provided at the air intake pipe, and a temperature detector is provided in the preheating channel.

[0018] The VOC detection device and temperature detector are both commercially available products that can be used in incinerators. They are common knowledge and are not marked in the attached drawings.

[0019] A method for treating waste gas using the aforementioned simple large-flux direct-fired waste gas environmental protection treatment device comprises the following steps:

[0020] (1) Preheating stage: Turn on all burners to heat the combustion chamber, store heat in the U-shaped heat storage body, and heat the preheating channel at the same time, so that the preheating temperature of the preheating channel reaches 500-600℃;

[0021] (2) Waste gas treatment stage:

[0022] a. When high-concentration exhaust gas is introduced into the air intake pipe, the long-flame burner and the bottom short-flame burner are turned on, and the exhaust gas enters the shell through the air intake pipe, is diverted and dispersed into the preheating channel through the diverter, and after the exhaust gas is preheated, it passes through the flame zone above the short-flame burner for preliminary high-temperature decomposition and then enters the first exhaust gas overfire cage. While the exhaust gas is passing through the cage, it is fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature to undergo thermal decomposition; then, the exhaust gas passes through the flame zone above the long-flame burner for high-temperature decomposition again and enters the second exhaust gas overfire cage. While the exhaust gas is passing through the cage, it is fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature to undergo thermal decomposition again. The clean air formed by the exhaust gas being purified, decomposed and exothermic for multiple times passes through the U-shaped heat storage body for heat storage and cooling, and is finally discharged from the exhaust pipe;

[0023] b. When low-concentration exhaust gas is introduced into the air intake pipe, the bottom short-flame burner is turned on, and the exhaust gas enters the shell through the air intake pipe, is diverted and dispersed into the preheating channel through the diverter, and after the exhaust gas is preheated, it passes through the flame zone above the short-flame burner for preliminary high-temperature decomposition and then enters the first exhaust gas overfire cage. While the exhaust gas is passing through the cage, it is fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature and is decomposed by heat; then, the exhaust gas passes through the second exhaust gas overfire cage and is again fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature and is decomposed by heat. After the exhaust gas is burned and purified, the clean air formed by decomposition and heat release passes through the U-shaped heat storage body for heat storage and cooling, and is finally discharged from the exhaust pipe;

[0024] When it is detected that the temperature in the preheating channel is lower than the preheating temperature, the long flame burner is started to heat the second exhaust gas overfire cage. The U-shaped heat storage body stores heat to make the preheating channel reach the preheating temperature and then the long flame burner is closed; when it is detected that the temperature of the first exhaust gas overfire cage and the second exhaust gas overfire cage is higher than 850℃, the burner at the corresponding position is closed, and the exhaust gas can continue to decompose and release heat under high-temperature residual heat. When it is detected that the temperature of the first exhaust gas overfire cage and the second exhaust gas overfire cage is lower than 750℃, the burner at the corresponding position is opened.

[0025] Furthermore, the burner flame temperature is 750-850°C and the exhaust gas treatment capacity is 15000m 3 / h.

[0026] The beneficial effects of the present invention are:

[0027] (1) The present application adopts a combustion chamber built in a shell, and a first exhaust gas overfire cage, a second exhaust gas overfire cage, and a U-shaped heat storage body are arranged in the combustion chamber. The gap between the combustion chamber and the shell is used as a preheating channel, and the exhaust gas flux is large and the preheating space is large. The first exhaust gas overfire cage and the second exhaust gas overfire cage are filled with a plurality of fine, flexible, and elastic stainless steel wire fillers. The wires in the cages fully cut and rotate the exhaust gas for heating, so that the high-temperature decomposition reaction continues throughout the cage, which greatly improves the exhaust gas overfire purification efficiency and achieves an emission concentration lower than the national emission standard after exhaust gas treatment. At the same time, the structure is simple, and the concentration link and the catalytic link are omitted, which greatly reduces the cost expenditure and gas consumption;

[0028] (2) The burner used in the present application is composed of a long-flame burner with a middle protrusion and a short-flame burner at the bottom. It is also provided with a first exhaust gas overfire cage and a second exhaust gas overfire cage. The first exhaust gas overfire cage is a hollow cylindrical body, and the long-flame burner passes through the middle. At the same time, it can select one layer of combustion purification or two layers of combustion purification according to the concentration of VOC exhaust gas, and utilize ultra-high temperature waste heat for oxidation and decomposition. It has high purification efficiency and is energy-saving and environmentally friendly. It is suitable for situations where there are both high-concentration exhaust gas workshops and low-concentration exhaust gas workshops.

[0029] (3) The present application timely opens or closes the corresponding burner according to the temperature in the preheating channel, the temperature of the first exhaust gas overfire cage, and the temperature of the second exhaust gas overfire cage, which has the advantages of ensuring the preheating effect and saving energy and reducing consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a cross-sectional view of the waste gas environmental protection treatment device of Example 1;

[0031] Figure 2 This is a cross-sectional view of the waste gas environmental protection treatment device of Example 2;

[0032] Figure 3 Exploded view of the internal structure of the combustion chamber;

[0033] Figure 4 This is the structural diagram of the first exhaust gas overfire cage;

[0034] Figure 5 This is a partial enlarged picture of the stainless steel wire filler;

[0035] Among them, 1-inlet pipe, 2-shell, 3-insulation layer, 4-combustion chamber, 5-first exhaust gas overfire cage, 6-U-type heat storage body, 7-second exhaust gas overfire cage, 8-burner, 9-long flame burner, 10-short flame burner, 11-natural gas pipeline, 12-valve, 13-diverter, 14-exhaust pipe, 15-preheating channel, 16-conical cavity, 17-bracket, 18-inlet, 19-exhaust port, 20-reversing heat storage body, 21-airflow reversing device, 22-air exchange valve, 23-stainless steel wire filler. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] Example 1

[0038] Reference Figure 1 , 3 , 4, 5, a simple large-flux direct-fired exhaust gas environmental protection treatment device, including a shell 2, the shell 2 is a hollow structure, the inner wall of the shell 2 is provided with a heat preservation layer 3, the top side of the shell is provided with an air intake pipe 1, the center of the shell 2 is provided with a combustion chamber 4, the combustion chamber 4 is a hollow structure with an opening at the bottom, and is made of stainless steel. The top of the combustion chamber 4 is connected to the exhaust pipe 14, and the exhaust pipe 14 passes through the top of the shell 2. The gap between the combustion chamber 4 and the inner wall is a preheating channel 15, and the preheating channel 15 is connected to the air intake pipe 1. A burner 8 is provided at the bottom of the combustion chamber 4, and the burner 8 is connected to the natural gas pipeline 11. The burner is composed of a long flame burner 9 protruding in the middle and a short flame burner 10 at the bottom; the inside of the combustion chamber 4 is provided with a first exhaust gas overfire cage 5, a second exhaust gas overfire cage 7, and a U-shaped heat storage body 6 from bottom to top, the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 are composed of a stainless steel bracket and a mesh, and a stainless steel wire filler 23 is provided in the cage. The first exhaust gas overfire cage 5 is arranged at the bottom of the combustion chamber 4 and above the burner 8. The U-shaped heat storage body 6 opens downward and is fixed in the combustion chamber 4 by a bottom integrated bracket 17. The second exhaust gas overfire cage 7 is embedded in the hollow part of the U-shaped heat storage body 6.

[0039] The present application adopts a combustion chamber built in the shell 2, and a first exhaust gas overfire cage 5, a second exhaust gas overfire cage 7, and a U-shaped heat storage body 6 are arranged in the combustion chamber 4, and the gap between the combustion chamber 4 and the shell 2 is used as a preheating channel 15. The U-shaped heat storage body 6 stores heat while keeping the second exhaust gas overfire cage 7 warm and providing heat for the preheating channel 15;

[0040] The outer wall of the combustion chamber 4 is provided with heat dissipation fins to provide heat to the preheating channel 15 and improve the exhaust gas preheating efficiency;

[0041] The stainless steel wire filler 23 is formed by winding a spring-shaped spiral steel wire and has the plasticity to be stretched and compressed according to the shape of the cage; the cage heights of the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 and the wire thickness and gap density of the stainless steel wire filler 23 are adjusted according to the actual exhaust gas flow, concentration and flame combustion amplitude.

[0042] Furthermore, the flame of the short flame burner 9 is higher than the first exhaust gas overfire cage 5, and the flame of the long flame burner 10 is higher than the bottom of the second exhaust gas overfire cage 7. The first exhaust gas overfire cage 5 is a hollow cylinder, and the long flame burner 9 passes through the middle. After the exhaust gas is initially thermally decomposed in the flame area, it passes through the wire cage area and is fully divided and rotated for thermal decomposition again.

[0043] In this scheme, the short flame burner 10 is used to burn the first exhaust gas overfire cage 5 for the first combustion purification, and the long flame burner 9 is used to burn the second exhaust gas overfire cage 7 for the second combustion purification and to provide heat for the U-shaped heat storage body 6 and the preheating channel 15.

[0044] Furthermore, the U-shaped heat storage body 6 is made of ceramic material.

[0045] Furthermore, a diverter 13 is provided on the top side of the combustion chamber 4 corresponding to the air inlet pipe 1 for diverting the exhaust gas into the preheating channel 15 .

[0046] Furthermore, a conical cavity 16 is provided at the bottom of the second exhaust gas overfire cage 7, and the flame of the long flame burner 9 penetrates into the conical cavity 16, so that the stainless steel wire filler 23 in the cage is evenly ignited.

[0047] Furthermore, a VOC detection device is provided at the air intake pipe 1 , and a temperature detector is provided in the preheating channel 15 .

[0048] A method for treating waste gas using the aforementioned simple large-flux direct-fired waste gas environmental protection treatment device comprises the following steps:

[0049] (1) Preheating stage: Turn on all burners 8 to heat the combustion chamber 4, the U-shaped heat storage body 6 stores heat, and heats the preheating channel 15, so that the preheating temperature of the preheating channel 15 reaches 500-600°C;

[0050] (2) Waste gas treatment stage:

[0051] a. When high-concentration exhaust gas is introduced into the air intake pipe 1, the long flame burner 9 and the bottom short flame burner 10 are turned on, and the exhaust gas enters the housing 2 through the air intake pipe 1, and is divided and dispersed into the preheating channel 15 through the diverter 13. After the exhaust gas is preheated, it passes through the flame zone above the short flame burner 10 for preliminary high-temperature decomposition, and then enters the first exhaust gas overfire cage 5. While the exhaust gas is overfired in the process of flowing through the cage, it is fully cut and rotated to be thermally decomposed by the wires in the stainless steel wire filler 23 that have reached the decomposition temperature; then, the exhaust gas passes through the flame zone above the long flame burner 9 for high-temperature decomposition again, and then enters the second exhaust gas overfire cage 7. While the exhaust gas is overfired in the process of flowing through the cage, it is fully cut and rotated to be thermally decomposed by the wires in the stainless steel wire filler 23 that have reached the decomposition temperature again. The clean air formed by the exhaust gas after multiple purification, decomposition and heat release passes through the U-shaped heat storage body 6 for heat storage and cooling, and is finally discharged from the exhaust pipe 14;

[0052] b. When low-concentration exhaust gas is introduced into the air intake pipe, the bottom short-flame burner 10 is opened, and the exhaust gas enters the housing 2 through the air intake pipe 1, and is divided and dispersed into the preheating channel 15 through the diverter 13. After the exhaust gas is preheated, it passes through the flame zone above the short-flame burner 10 for preliminary high-temperature decomposition, and then enters the first exhaust gas overfire cage 5. While the exhaust gas is overfired in the process of flowing through the cage, it is fully cut and rotated to be thermally decomposed by the wires in the stainless steel wire filler 23 that have reached the decomposition temperature. Then, it passes through the second exhaust gas overfire cage 7 and is again fully cut and rotated to be thermally decomposed by the wires in the stainless steel wire filler 23 that have reached the decomposition temperature. After the exhaust gas is burned and purified, the clean air formed by the decomposition and heat release passes through the U-shaped heat storage body 6 for heat storage and cooling, and is finally discharged from the exhaust pipe 14;

[0053] When it is detected that the temperature in the preheating channel 15 is lower than the preheating temperature, the long flame burner 9 is started to heat the second exhaust gas overfire cage 7. The U-shaped heat storage body 6 stores heat to make the preheating channel 15 reach the preheating temperature and then the long flame burner 9 is closed; when it is detected that the temperature of the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 is higher than 850°C, the burner 8 at the corresponding position is closed, and the exhaust gas can continue to decompose and release heat under high-temperature residual heat. When it is detected that the temperature of the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 is lower than 750°C, the burner 8 at the corresponding position is opened.

[0054] Furthermore, the flame temperature of burner 8 is 750-850°C, and the exhaust gas treatment capacity is 15000m 3 / h.

[0055] Example 2

[0056] Reference Figure 2 , 3, 4, 5, a simple large-flux direct-fired exhaust gas environmental protection treatment device, including a shell 2, the shell 2 is a hollow structure, the inner wall of the shell 2 is provided with a heat preservation layer 3, the top side of the shell is provided with an air intake pipe 1, the center of the shell 2 is provided with a combustion chamber 4, the combustion chamber 4 is a hollow structure with an opening at the bottom, and is made of stainless steel. The top of the combustion chamber 4 is connected to the exhaust pipe 14, and the exhaust pipe 14 passes through the top of the shell 2. The gap between the combustion chamber 4 and the inner wall is a preheating channel 15, and the preheating channel 15 is connected to the air intake pipe 1. A burner 8 is provided at the bottom of the combustion chamber 4, and the burner 8 is connected to the natural gas pipeline 11. The burner is composed of a long flame burner 9 protruding in the middle and a short flame burner 10 at the bottom; the inside of the combustion chamber 4 is provided with a first exhaust gas overfire cage 5, a second exhaust gas overfire cage 7, and a U-shaped heat storage body 6 from bottom to top, the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 are composed of a stainless steel bracket and a mesh, and a stainless steel wire filler 23 is provided in the cage. The first exhaust gas overfire cage 5 is arranged at the bottom of the combustion chamber 4 and above the burner 8. The U-shaped heat storage body 6 opens downward and is fixed in the combustion chamber 4 by a bottom integrated bracket 17. The second exhaust gas overfire cage 7 is embedded in the hollow part of the U-shaped heat storage body 6.

[0057] The present application adopts a combustion chamber built in the shell 2, and a first exhaust gas overfire cage 5, a second exhaust gas overfire cage 7, and a U-shaped heat storage body 6 are arranged in the combustion chamber 4, and the gap between the combustion chamber 4 and the shell 2 is used as a preheating channel 15. The U-shaped heat storage body 6 stores heat while keeping the second exhaust gas overfire cage 7 warm and providing heat for the preheating channel 15;

[0058] The outer wall of the combustion chamber 4 is provided with heat dissipation fins to provide heat to the preheating channel 15 and improve the exhaust gas preheating efficiency;

[0059] The stainless steel wire filler 23 is formed by winding a spring-shaped spiral steel wire and has the plasticity to be stretched and compressed according to the shape of the cage; the cage heights of the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 and the wire thickness and gap density of the stainless steel wire filler 23 are adjusted according to the actual exhaust gas flow, concentration and flame combustion amplitude.

[0060] Furthermore, the flame of the short flame burner 9 is higher than the first exhaust gas overfire cage 5, and the flame of the long flame burner 10 is higher than the bottom of the second exhaust gas overfire cage 7. The first exhaust gas overfire cage 5 is a hollow cylinder, and the long flame burner 9 passes through the middle. After the exhaust gas is initially thermally decomposed in the flame area, it passes through the wire cage area and is fully divided and rotated for thermal decomposition again.

[0061] In this scheme, the short flame burner 10 is used to burn the first exhaust gas overfire cage 5 for the first combustion purification, and the long flame burner 9 is used to burn the second exhaust gas overfire cage 7 for the second combustion purification and to provide heat for the U-shaped heat storage body 6 and the preheating channel 15.

[0062] Furthermore, two reversing heat storage bodies 20 are provided between the shell 2 and the intake pipe 1 and the exhaust pipe 14. The intake pipe 1 and the exhaust pipe 14 are connected to the two reversing heat storage bodies 20 through an airflow reversing device 21. The reversing heat storage bodies 20 are connected to the air intake port 18 and the exhaust port 19 on the shell 2 through the airflow reversing device 21. The air intake port 18 is connected to the preheating channel 15, and the exhaust port 19 is connected to the top of the combustion chamber 4. The airflow reversing device 21 allows the exhaust gas to enter any one of the reversing heat storage bodies 20 from the intake pipe 1 and then enter the air intake port 19. The clean gas enters the other reversing heat storage body 20 from the exhaust port 19 and then enters the exhaust pipe 14.

[0063] The airflow reversing device 21 includes four ventilation valves 22, two ventilation valves 22 are respectively provided at the place where the air intake pipe 1 leads to the two reversing heat storage bodies 20 and the place where the exhaust pipe 14 leads to the two reversing heat storage bodies 20, and two ventilation valves are respectively provided at the place where the air intake port 18 leads to the two reversing heat storage bodies 20 and the exhaust port 19 leads to the two reversing heat storage bodies 20.

[0064] A heat-insulating layer 3 is also provided around the reversing heat storage body, which is preferably made of ceramic material.

[0065] Furthermore, the U-shaped heat storage body 6 is made of ceramic material.

[0066] Furthermore, a diverter 13 is provided on the top side of the combustion chamber 4 corresponding to the air inlet pipe 1 for diverting the exhaust gas into the preheating channel 15 .

[0067] Furthermore, a conical cavity 16 is provided at the bottom of the second exhaust gas overfire cage 7, and the flame of the long flame burner 9 penetrates into the conical cavity 16, so that the stainless steel wire filler 23 in the cage is evenly ignited.

[0068] Furthermore, a VOC detection device is provided at the air intake pipe 1 , and a temperature detector is provided in the preheating channel 15 .

[0069] A method for treating waste gas using the aforementioned simple large-flux direct-fired waste gas environmental protection treatment device comprises the following steps:

[0070] (1) Preheating stage: open the air exchange valves 22 on the two paths from the exhaust port 19 to the right reversing regenerator 20 and from the right reversing regenerator 20 to the exhaust pipe 14, and keep the other air exchange valves 22 closed. Open all burners 8 to heat the combustion chamber 4, store heat in the U-shaped regenerator 6, and heat the preheating channel 15, so that the preheating temperature of the preheating channel 15 and the right reversing regenerator 20 reaches 500-600°C.

[0071] (2) Exhaust gas treatment stage: open the ventilation valves 22 on four paths: the intake pipe 1 leading to the right reversing heat storage body 20, the right reversing heat storage body 20 leading to the intake port 18, the exhaust port 19 leading to the left reversing heat storage body 20, and the left reversing heat storage body 20 leading to the exhaust pipe 14, and close the remaining ventilation valves 22.

[0072] a. When high-concentration exhaust gas is introduced into the air intake pipe 1, the long flame burner 9 and the bottom short flame burner 10 are turned on, and the exhaust gas enters the right reversing heat storage body 20 through the air intake pipe 1, and then enters the shell 2 through the air inlet 18, and is divided and dispersed into the preheating channel 15 by the diverter 13. After the exhaust gas is preheated, it passes through the flame zone above the short flame burner 10 for preliminary high-temperature decomposition and then enters the first exhaust gas overfire cage 5. While the exhaust gas is overfired in the process of flowing through the cage, it is also burned by the stainless steel wire filler 2 which has reached the decomposition temperature. 3 is fully cut and rotated to be thermally decomposed; then, the exhaust gas passes through the flame zone above the long flame burner 9 and is decomposed again at high temperature before entering the second exhaust gas overfire cage 7. While passing through the cage, the exhaust gas is overfired and is fully cut and rotated to be thermally decomposed by the filaments in the stainless steel wire filler 23 that has reached the decomposition temperature. The exhaust gas is purified and decomposed for multiple times to form clean air that is thermally stored and cooled by the U-shaped heat storage body 6, and then enters the left reversing heat storage body 20 to store heat and cool again, and is finally discharged from the exhaust pipe 14;

[0073] b. When low-concentration exhaust gas is introduced into the air intake pipe 1, the bottom short-flame burner 10 is opened, and the exhaust gas enters the right reversing heat storage body 20 through the air intake pipe 1, and then enters the shell 2 through the air inlet 18, and is divided and dispersed into the preheating channel 15 through the diverter 13. After the exhaust gas is preheated, it passes through the flame zone above the short-flame burner 10 for preliminary high-temperature decomposition, and then enters the first exhaust gas overfire cage 5. While passing through the cage, the exhaust gas is fully cut and rotated to be thermally decomposed by the wires in the stainless steel wire filler 23 that have reached the decomposition temperature. Then, it passes through the second exhaust gas overfire cage 7 and is fully cut and rotated to be thermally decomposed by the wires in the stainless steel wire filler 23 that have reached the decomposition temperature. After the exhaust gas is burned and purified, the clean air formed by the decomposition and heat release passes through the U-shaped heat storage body 6 for heat storage and cooling, and then enters the left reversing heat storage body 20 for heat storage and cooling again, and is finally discharged from the exhaust pipe 14;

[0074] When it is detected that the temperature in the preheating channel 15 is lower than the preheating temperature, the long flame burner 9 is started to heat the second exhaust gas overfire cage 7. The U-shaped heat storage body 6 stores heat to make the preheating channel 15 reach the preheating temperature and then the long flame burner 9 is closed; when it is detected that the temperature of the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 is higher than 850°C, the burner 8 at the corresponding position is closed, and the exhaust gas can continue to decompose and release heat under high-temperature residual heat. When it is detected that the temperature of the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 is lower than 750°C, the burner 8 at the corresponding position is opened.

[0075] (3) Reversing stage: the ventilation valve 22 that is in the open state is closed, and the ventilation valve 22 that is in the closed state is opened to complete the reversing. At this time, the exhaust gas enters the left reversing heat storage body 20 through the intake pipe 1, and then enters the shell 2 through the air inlet 18. It is divided and dispersed into the preheating channel 15 by the diverter 13. After the exhaust gas is preheated, it passes through the first exhaust gas overfire cage 5 and is burned and purified by the short flame burner 10. After the exhaust gas is burned and purified, the clean air formed by the decomposition and heat release passes through the second exhaust gas overfire cage 7 and is optionally burned and purified by the long flame burner 9 for the second time. After the exhaust gas is decomposed and heated after the secondary purification, the clean air formed by the decomposition and heat release passes through the U-shaped heat storage body 6 for heat storage and cooling, and then enters the right reversing heat storage body 20 for heat storage and cooling again, and is finally discharged from the exhaust pipe 14.

[0076] Furthermore, the burner flame temperature is 750-850°C and the exhaust gas treatment capacity is 15000m 3 / h.

[0077] Example 1: High concentration exhaust gas is introduced, the exhaust gas concentration is 500-600 mg / m 3 Example 3: Low concentration exhaust gas is introduced, the exhaust gas concentration is 50-60 mg / m 3 , the rest is the same as in Example 1;

[0078] Example 2: High concentration exhaust gas is introduced, the exhaust gas concentration is 500-600 mg / m 3 Example 4: Low concentration exhaust gas is introduced, the exhaust gas concentration is 50-60 mg / m 3 , the rest is the same as in Example 2;

[0079] Comparative Example 1

[0080] The first exhaust gas overfire cage and the short flame burner are removed, and only the long flame burner is used, and the rest is the same as in Example 1.

[0081] Comparative Example 2

[0082] The first exhaust gas overfire cage and the short flame burner are removed, and only the long flame burner is used, and the rest is the same as in Example 3.

[0083] The VOC online monitoring analyzer is used to detect the VOC concentration of the exhaust gas from the simple large-flux direct-fired exhaust gas environmental protection treatment device. The specific data are shown in Table 1.

[0084] Table 1

[0085] Example VOC Concentration 1 <![CDATA[18mg / m 3 ]]> 2 <![CDATA[21mg / m 3 ]]> 3 <![CDATA[8mg / m 3 ]]> 4 <![CDATA[12mg / m 3 ]]> Comparative Example 1 <![CDATA[38mg / m 3 ]]> Comparative Example 2 <![CDATA[23mg / m 3 ]]>

[0086] The present application adopts a combustion chamber 4 built in a shell 2, and a first exhaust gas overfire cage 5, a second exhaust gas overfire cage 7, and a U-shaped heat storage body 6 are arranged in the combustion chamber 4, and the gap between the combustion chamber 4 and the shell 2 is used as a preheating channel 15, the exhaust gas flux is large and the preheating space is large, and the first exhaust gas overfire cage 5 and the second exhaust gas overfire cage 7 are filled with a plurality of fine and flexible stainless steel wire fillers 23 wound by spring spiral steel wires. The wires in the cages fully cut and rotate the exhaust gas, so that the high-temperature decomposition reaction is continuously carried out in the cage throughout the whole process, which greatly improves the exhaust gas overfire purification efficiency, and realizes that the emission concentration of the exhaust gas after treatment is lower than the national emission standard. At the same time, the structure is simple, and the concentration link and the catalytic link are omitted, which greatly reduces the cost expenditure and gas consumption;

[0087] The burner used in the present application is composed of a long flame burner 9 with a middle protrusion and a short flame burner 10 at the bottom, and is also provided with a first exhaust gas overfire cage 5 and a second exhaust gas overfire cage 7. The first exhaust gas overfire cage 5 is a hollow cylindrical body, and the long flame burner 9 passes through the middle. At the same time, it can select one layer of combustion purification or two layers of combustion purification according to the concentration of VOC exhaust gas, and utilize ultra-high temperature waste heat for oxidation and decomposition. It has high purification efficiency and is energy-saving and environmentally friendly. It is suitable for situations where there are both high-concentration exhaust gas workshops and low-concentration exhaust gas workshops.

[0088] When the temperature of the long flame burner 9 in the preheating channel 15 is lower than the preheating temperature, the second exhaust gas overfire cage 7 is heated, and the U-shaped heat storage body 6 stores heat so that the preheating channel 15 reaches the preheating temperature and then the long flame burner 9 is closed, which has the effect of timely increasing the preheating temperature and saving energy and reducing consumption.

[0089] With the above-mentioned ideal embodiment of the present invention as inspiration, through the above-mentioned description content, relevant staff can completely within the scope of the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A simple large-flux direct-fired exhaust gas environmental protection treatment device, comprising a shell (2), the shell (2) is a hollow structure, the inner wall of the shell (2) is provided with a heat-insulating layer (3), and the top side of the shell is provided with an air intake pipe (1), characterized in that: A combustion chamber (4) is provided in the center of the shell (2). The combustion chamber (4) is a hollow structure with an opening at the bottom and is made of stainless steel. The top of the combustion chamber (4) is connected to an exhaust pipe (14). The exhaust pipe (14) passes through the top of the shell (2). The gap between the combustion chamber (4) and the inner wall is a preheating channel (15). The preheating channel (15) is connected to the air intake pipe (1). A burner (8) is provided at the bottom of the combustion chamber (4). The burner (8) is connected to a natural gas pipeline (11). The burner (8) is composed of a long flame burner (9) protruding in the middle and a short flame burner (10) at the bottom. A first exhaust gas overfire cage (5), a second exhaust gas overfire cage (7), and a U-shaped heat storage body (6) are sequentially arranged inside the combustion chamber (4) from bottom to top. The first exhaust gas overfire cage (5) and the second exhaust gas overfire cage (7) are composed of a stainless steel bracket and a mesh. Stainless steel wire filler (23) is arranged inside the cage. The first exhaust gas overfire cage (5) is arranged at the bottom of the combustion chamber (4) and above the burner (8). The U-shaped heat storage body (6) opens downward and is fixed in the combustion chamber (4) by means of a bottom integrated bracket (17). The second exhaust gas overfire cage (7) is embedded in the hollow part of the U-shaped heat storage body (6).

2. According to claim 1, a simple large-flux direct-fired exhaust gas environmental protection treatment device is characterized in that: The flame of the short flame burner is higher than the first exhaust gas overfire cage, and the flame of the long flame burner is higher than the bottom of the second exhaust gas overfire cage. The first exhaust gas overfire cage is a hollow cylindrical body, and the long flame burner passes through the middle.

3. A simple large-flux direct-fired exhaust gas environmental protection treatment device according to claim 2, characterized in that: The stainless steel wire filler is formed by winding a spring-shaped spiral steel wire and has the plasticity to be stretched and compressed according to the shape of the cage; the cage heights of the first exhaust gas overfire cage and the second exhaust gas overfire cage and the wire thickness and gap density of the stainless steel wire filler are adjusted according to the actual exhaust gas flow, concentration and flame combustion amplitude.

4. A simple large-flux direct-fired exhaust gas environmental protection treatment device according to any one of claims 1 to 3, characterized in that: Two reversing heat storage bodies are arranged between the shell and the air inlet pipe and the exhaust pipe. The air inlet pipe and the exhaust pipe are connected to the two reversing heat storage bodies through an airflow reversing device. The reversing heat storage bodies are connected to the air inlet and the exhaust port on the shell through the airflow reversing device. The airflow reversing device allows the exhaust gas to enter any one of the reversing heat storage bodies from the air inlet pipe and then enter the air inlet, and the clean gas enters the other reversing heat storage body from the exhaust port and then enters the exhaust pipe.

5. A simple large-flux direct-fired exhaust gas environmental protection treatment device according to claim 4, characterized in that: The U-shaped heat storage body is made of ceramic material.

6. A simple large-flux direct-fired exhaust gas environmental protection treatment device according to claim 4, characterized in that: A diverter is provided on the top side of the combustion chamber corresponding to the air inlet pipe, which is used to divert the exhaust gas into the preheating channel.

7. A simple large-flux direct-fired exhaust gas environmental protection treatment device according to claim 4, characterized in that: A conical cavity is provided at the bottom of the second exhaust gas fire cage to ensure that the stainless steel wire filling material in the cage is evenly ignited.

8. A simple large-flux direct-fired exhaust gas environmental protection treatment device according to claim 4, characterized in that: A VOC detection device is provided at the air intake pipe, and a temperature detector is provided in the preheating channel.

9. A method for treating waste gas using the simple large-flux direct-fired waste gas environmental protection treatment device according to claim 3, characterized in that: The following steps are involved: (1) Preheating stage: Turn on all burners to heat the combustion chamber, store heat in the U-shaped heat storage body, and heat the preheating channel at the same time, so that the preheating temperature of the preheating channel reaches 500-600℃; (2) Waste gas treatment stage: a. When high-concentration exhaust gas is introduced into the air intake pipe, the long-flame burner and the bottom short-flame burner are turned on, and the exhaust gas enters the shell through the air intake pipe, is diverted and dispersed into the preheating channel through the diverter, and after the exhaust gas is preheated, it passes through the flame zone above the short-flame burner for preliminary high-temperature decomposition and then enters the first exhaust gas overfire cage. While the exhaust gas is passing through the cage, it is fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature to undergo thermal decomposition; then, the exhaust gas passes through the flame zone above the long-flame burner for high-temperature decomposition again and enters the second exhaust gas overfire cage. While the exhaust gas is passing through the cage, it is fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature to undergo thermal decomposition again. The clean air formed by the exhaust gas being purified, decomposed and exothermic for multiple times passes through the U-shaped heat storage body for heat storage and cooling, and is finally discharged from the exhaust pipe; b. When low-concentration exhaust gas is introduced into the air intake pipe, the bottom short-flame burner is turned on, and the exhaust gas enters the shell through the air intake pipe, is diverted and dispersed into the preheating channel through the diverter, and after the exhaust gas is preheated, it passes through the flame zone above the short-flame burner for preliminary high-temperature decomposition and then enters the first exhaust gas overfire cage. While the exhaust gas is passing through the cage, it is fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature and is decomposed by heat; then, the exhaust gas passes through the second exhaust gas overfire cage and is again fully cut and rotated by the wires in the stainless steel wire filler that have reached the decomposition temperature and is decomposed by heat. After the exhaust gas is burned and purified, the clean air formed by decomposition and heat release passes through the U-shaped heat storage body for heat storage and cooling, and is finally discharged from the exhaust pipe; When it is detected that the temperature in the preheating channel is lower than the preheating temperature, the long flame burner is started to heat the second exhaust gas overfire cage, and the U-shaped heat storage body stores heat so that the preheating channel reaches the preheating temperature and then the long flame burner is closed; when it is detected that the temperature of the first exhaust gas overfire cage and the second exhaust gas overfire cage is higher than 850℃, the burner at the corresponding position is closed, and the exhaust gas can continue to decompose and release heat under high-temperature residual heat. When it is detected that the temperature of the first exhaust gas overfire cage and the second exhaust gas overfire cage is lower than 750℃, the burner at the corresponding position is opened.

10. The waste gas treatment method according to claim 9, characterized in that: The burner flame temperature is 750~850℃ and the exhaust gas treatment capacity is 15000m 3 / h.

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