A reciprocating porous media VOCs combustion apparatus

Abstract

The utility model belongs to the technical field of combustion equipment discloses a reciprocating porous medium VOCs combustion equipment. The equipment is through setting up porous medium combustion device and with the main air inlet pipeline, main exhaust pipeline, back gas pipeline and flue gas pipeline connected to porous medium combustion device, adopts porous medium combustion device to be able to guarantee VOCs gas full combustion. The setting buffer gas tank and air draught fan on main air inlet pipeline make the gas that enters porous medium combustion device can be fully mixed in buffer gas tank, guarantee the stability of porous medium combustion device combustion. The setting back gas pipeline can be more in porous medium combustion device switches in the air inlet and air outlet direction, recycles the VOCs gas that has not been handled that remains in the pipeline of air inlet end of porous medium combustion device originally, prevents producing instantaneous emission peak and causes emission to exceed the standard, avoids causing environmental pollution. In addition, through negative pressure recovery pipeline residual gas, will not lead to operating cost increase, also does not influence equipment operation.

Description

Technical Field

[0001] This utility model relates to the field of combustion equipment technology, and in particular to a reciprocating porous media VOCs combustion equipment. Background Technology

[0002] VOCs (Volatile Organic Compounds) are volatile organic compounds that originate from industries such as petroleum, chemicals, construction, industrial coating, and packaging printing. VOCs include substances such as formaldehyde, toluene, diisocyanates, and trichloroethane, which can pose serious health risks.

[0003] Currently, porous media VOCs combustion devices are mainly used for VOCs waste gas treatment. Porous media combustion technology is a combustion method that incorporates porous media into the burner. Due to the presence of convection, conduction, and radiation heat exchange mechanisms, burners with porous media achieve more uniform temperatures in the combustion zone, maintaining a relatively stable temperature gradient. This results in stable combustion while also exhibiting high volumetric heat intensity.

[0004] However, current reciprocating porous media VOCs combustion equipment uses numerous on / off valves, and these valves have an operating time when switching. After the inlet / outlet direction is switched, untreated VOCs gas may remain in the original inlet pipe. Since the inlet pipe becomes the outlet pipe after the direction switch, this untreated VOCs gas is directly emitted, causing instantaneous pollutant exceedances and environmental pollution. The industry's common solution to this problem is to add a pressure-accumulating purging chamber and purging fans. However, purging causes a drop in furnace temperature, requiring time and energy to return it to operating temperature. This increases equipment investment and operating energy consumption, and can easily affect the processing efficiency of the porous media combustion device, hindering the maintenance of high efficiency and continuous operation.

[0005] Therefore, there is an urgent need for a reciprocating porous media VOCs combustion device that can ensure continuous and efficient operation of the combustion device without exceeding emission standards and causing environmental pollution. Utility Model Content

[0006] The purpose of this invention is to provide a reciprocating porous media VOCs combustion device that ensures continuous and efficient operation of the combustion device while preventing excessive emissions that could cause environmental pollution.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A reciprocating porous media VOCs combustion device includes a porous media combustion device and a main air intake pipe, a main exhaust pipe, a return air pipe and a smoke exhaust pipe connected to the porous media combustion device.

[0009] The porous medium combustion device includes a first air inlet / outlet and a second air inlet / outlet.

[0010] One end of the main air intake pipe is connected to an external air supply pipeline, and the other end can be selectively connected to the first air inlet or outlet or the second air inlet or outlet of the porous medium combustion device.

[0011] One end of the main exhaust pipe can be selectively connected to the first air inlet / outlet or the second air inlet / outlet of the porous medium combustion device, and the other end can be selectively connected to the return air pipe or the smoke exhaust pipe.

[0012] The main intake pipe is connected to a buffer gas tank and an induced draft fan. The induced draft fan is used to deliver gas to the porous medium combustion device and at the same time maintain a negative pressure in the buffer gas tank. The end of the return gas pipe away from the main exhaust pipe is connected to the intake end of the buffer gas tank.

[0013] Preferably, the system further includes a first inlet / outlet pipe, a second inlet / outlet pipe, and a four-way valve. One end of the first inlet / outlet pipe is connected to the first inlet / outlet port, one end of the second inlet / outlet pipe is connected to the second inlet / outlet port, the other ends of the first and second inlet / outlet pipes are respectively connected to two of the valve ports of the four-way valve, and the main inlet pipe and the main exhaust pipe are connected to the other two valve ports of the four-way valve.

[0014] Preferably, the four-way valve includes at least a first position and a second position. When the four-way valve is in the first position, the main intake pipe is connected to the first intake and exhaust pipe, and the main exhaust pipe is connected to the second intake and exhaust pipe. When the four-way valve is in the second position, the main intake pipe is connected to the second intake and exhaust pipe, and the main exhaust pipe is connected to the first intake and exhaust pipe.

[0015] Preferably, a three-way valve is also included, through which the main exhaust pipe is selectively connected to the smoke exhaust pipe or the return gas pipe.

[0016] Preferably, both the four-way valve and the three-way valve are automatic control valves.

[0017] Preferably, an LEL gas concentration detector is also included, which is installed on the main air intake pipe and located on one side of the air intake end of the buffer gas tank.

[0018] Preferably, a heat storage body is provided between the first air inlet / outlet and the porous medium, and between the second air inlet / outlet and the porous medium, in the porous medium combustion device.

[0019] Preferably, the external gas supply pipeline can supply combustion-supporting gas and / or fuel gas and / or VOCs gas, and the gas from the external gas supply pipeline flows into the main air intake pipeline and enters the buffer gas tank.

[0020] Preferably, the buffer tank is equipped with a pressure gauge.

[0021] Preferably, the end of the exhaust duct away from the main exhaust duct is connected to the chimney.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides a reciprocating porous media VOCs combustion device, including a porous media combustion device and a main air inlet pipe, a main exhaust pipe, a return gas pipe, and a smoke exhaust pipe connected to the porous media combustion device; the porous media combustion device includes a first air inlet / outlet and a second air inlet / outlet; one end of the main air inlet pipe is connected to an external gas supply pipeline, and the other end can selectively connect to either the first air inlet / outlet or the second air inlet / outlet of the porous media combustion device; one end of the main exhaust pipe can selectively connect to either the first air inlet / outlet or the second air inlet / outlet of the porous media combustion device, and the other end can selectively connect to either the return gas pipe or the smoke exhaust pipe; wherein, a buffer gas tank and an induced draft fan are connected to the main air inlet pipe, the induced draft fan is used to deliver gas to the porous media combustion device, and at the same time maintain a negative pressure in the buffer gas tank; the end of the return gas pipe away from the main exhaust pipe is connected to the air inlet end of the buffer gas tank. This utility model discloses a reciprocating porous media VOCs combustion device. By incorporating a porous media combustion device and connected to it via a main intake pipe, main exhaust pipe, return pipe, and flue gas pipe, the porous media combustion device ensures complete combustion of VOCs gases, offering advantages such as high combustion rate and good combustion stability. It can also utilize fuels with very low calorific value and allows for self-sustaining combustion of even lower concentration gases within the porous media space, thereby reducing fuel replenishment and lowering processing costs. Furthermore, this utility model includes a buffer tank and an induced draft fan on the main intake pipe, ensuring thorough mixing of the gas entering the porous media combustion device and guaranteeing combustion stability. The return pipe further recovers untreated VOCs gases remaining in the intake pipe when the porous media combustion device switches between intake and exhaust directions, preventing instantaneous emission peaks that could exceed emission standards and cause environmental pollution. In addition, recovering residual gas from the pipeline by negative pressure will not increase operating costs or affect the operation of the porous media combustion device, thus further ensuring the combustion stability of the porous media combustion device. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the first cycle operation of the reciprocating porous media VOCs combustion device in this embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the first state operation of the reciprocating porous media VOCs combustion device in the second cycle according to an embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the second state operation of the reciprocating porous media VOCs combustion device in the second cycle of this utility model embodiment;

[0027] Figure 4 This is a schematic diagram of the first state of the third cycle of the reciprocating porous media VOCs combustion device in this embodiment of the present invention.

[0028] In the picture:

[0029] 1. Porous medium combustion device; 11. First air inlet / outlet; 12. Second air inlet / outlet; 13. Porous medium; 14. Heat storage body;

[0030] 2. Main intake pipe; 21. Buffer gas tank; 22. Exhaust fan; 23. LEL gas concentration detector;

[0031] 3. Main exhaust pipe; 4. Return air pipe; 5. Smoke exhaust pipe;

[0032] 61. First air inlet / outlet pipe; 62. Second air inlet / outlet pipe;

[0033] 7. Four-way valve; 8. Three-way valve. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] Porous media combustion technology is a combustion method that incorporates porous media into the burner. The porous media can be honeycomb ceramics or foam ceramics such as silicon carbide, silicon nitride, alumina, mullite, cordierite, and zirconium oxide. Compared to free combustion, porous media combustion offers advantages such as higher combustion rate, better combustion stability, wider load adjustment range, higher volumetric heat intensity, smaller burner size, better gas adaptability, lower pollutant emissions in flue gas, wider combustion limits, and the ability to burn gases with very low calorific value.

[0039] Porous media combustion technology is a type of "super-enthalpy combustion" technology. It refers to a state where the enthalpy of the original gas mixture is increased by a further increase. By placing porous media materials in the high-temperature flue gas channel, the powerful heat storage and conduction capabilities of these materials enable heat feedback, using the heat generated by combustion to heat the gas mixture upstream of the reaction zone, thus greatly enhancing the combustion reaction. Neglecting heat loss, the flame temperature can exceed the corresponding adiabatic flame temperature of the unpreheated gas mixture; therefore, it is also called "super-adiabatic combustion." The super-enthalpy combustion temperature exceeding the adiabatic combustion temperature allows lower concentrations of gas to sustain combustion within the porous media space, thereby reducing the need for fuel replenishment and lowering processing costs.

[0040] The porous media combustion device 1 is mainly used for VOCs waste gas treatment. To reduce fuel consumption and achieve maximum heat recovery and utilization, it often adopts a reciprocating design. For example... Figure 1As shown, a heat storage body 14 is provided between the first air inlet / outlet 11 and the porous medium 13, and between the second air inlet / outlet 12 and the porous medium 13, in the porous media combustion device 1. Upon initial use, the porous media combustion device 1 can be supplied with fuel gas and combustion-supporting gas, which are ignited within the device to preheat the porous medium and the heat storage body 14. In alternative embodiments, the porous media combustion device 1 can also be preheated using electric heating. All of these preheating methods are mature existing technologies and will not be elaborated upon further here. After the waste gas (VOCs) to be treated is mixed with air or fuel gas, it is transported to the porous media combustion device 1 by the induced draft fan 22. It enters from the first inlet and outlet 11 of the device. After being preheated by the multi-heat storage body 14, the waste gas to be treated undergoes superenthalpy combustion treatment in the furnace through the porous media. The toxic and harmful media in the waste gas are fully burned and converted into harmless H2O and CO2. The high-temperature flue gas flows through the second inlet and outlet 12, and the heat is retained in the heat storage body 14 on one side of the second inlet and outlet 12. The low-temperature flue gas (the temperature decreases after the high-temperature flue gas exchanges heat with the heat storage body 14) is discharged from the second inlet and outlet 12 of the porous media combustion device 1 and discharged into the air through the chimney. When the heat storage medium 14 on the second inlet / outlet 12 side of the furnace reaches the set heat storage temperature, the control system sends a signal, and the corresponding valve automatically switches. VOCs gas enters through the second inlet / outlet 12, and after combustion, the low-temperature flue gas is discharged from the first inlet / outlet 11, completing one cycle of switching. This process is then repeated continuously. During this process, the heat stored in the heat storage medium 14 in each switching cycle can be used to preheat the next batch of exhaust gas, saving fuel consumption and reducing operating costs.

[0041] The reciprocating porous media VOCs combustion device provided by this utility model includes a porous media combustion device 1 and a main air intake pipe 2, a main exhaust pipe 3, a return air pipe 4, and a smoke exhaust pipe 5 connected to the porous media combustion device 1. The porous media combustion device 1 can ensure the complete combustion of VOCs gas and has the advantages of high combustion rate and good combustion stability. Moreover, it can burn fuel gas with very low calorific value and can allow lower concentration gases to self-sustain combustion in the porous media space, thereby reducing the need for fuel gas replenishment and reducing treatment costs.

[0042] In some embodiments, the porous media combustion device 1 includes a first air inlet / outlet 11 and a second air inlet / outlet 12; one end of the main air intake pipe 2 is connected to an external air supply pipe, and the other end can selectively communicate with either the first air inlet / outlet 11 or the second air inlet / outlet 12 of the porous media combustion device 1; one end of the main exhaust pipe 3 can selectively communicate with either the first air inlet / outlet 11 or the second air inlet / outlet 12 of the porous media combustion device 1, and the other end can selectively communicate with either the return air pipe 4 or the exhaust pipe 5. The end of the exhaust pipe 5 away from the main exhaust pipe 3 is connected to a chimney. A buffer gas tank 21 and an induced draft fan 22 are connected to the main air intake pipe 2. The induced draft fan 22 is used to supply gas to the porous media combustion device 1 while maintaining a negative pressure inside the buffer gas tank 21; the end of the return air pipe 4 away from the main exhaust pipe 3 is connected to the air inlet end of the buffer gas tank 21. Understandably, the inclusion of a buffer tank 21 and an induced draft fan 22 on the main intake pipe 2 ensures that the gas entering the porous media combustion device 1 is fully mixed within the buffer tank 21, guaranteeing the combustion stability of the porous media combustion device 1. Furthermore, the return gas pipe 4 allows for the recovery of untreated VOCs gas remaining in the intake pipe of the porous media combustion device 1 when switching between intake and exhaust directions, returning it to the buffer tank 21. This prevents instantaneous emission peaks that could lead to excessive emissions and environmental pollution. Additionally, the negative pressure generated by the induced draft fan 22 recovers residual gas from the equipment and / or pipes, eliminating the need for additional gas storage and purging devices. This avoids increased operating costs and does not affect the operation of the porous media combustion device 1, simplifying the structure while further ensuring the combustion stability of the porous media combustion device 1. Furthermore, the use of buffer gas tank 21 to recover residual gas allows the recovered gas to enter the buffer gas tank 21 together with the original gas in the main intake pipe 2, so that the recovered gas is fully mixed with the original gas. This avoids the phenomenon of unstable gas combustion and equipment malfunction caused by a sudden decrease in the concentration of combustible gas due to a small amount of flue gas (non-flammable) that may exist in the recovered gas.

[0043] Existing reciprocating VOCs combustion equipment includes two exhaust channels and two intake pipes. Each of the four pipes is equipped with a switch valve to control the switching of the intake and exhaust directions. The piping setup is complex and has many potential points of failure. A failure of the automatic actuator of any valve will cause the multi-hole media combustion device 1 to be shut down for maintenance. In addition, the automatic control valves are large in size and occupy a lot of space. VOCs combustion equipment is mostly skid-mounted, which has high requirements for floor space and space. The design of 4 automatic control valves requires more furnace openings and piping configurations, which is not conducive to the integration and miniaturization of the equipment. The large number of automatic control valves will also increase the investment cost.

[0044] Therefore, in some embodiments, the reciprocating porous media VOCs combustion device of this utility model further includes a first inlet / outlet pipe 61, a second inlet / outlet pipe 62, and a four-way valve 7. One end of the first inlet / outlet pipe 61 is connected to the first inlet / outlet port 11, one end of the second inlet / outlet pipe 62 is connected to the second inlet / outlet port 12, and the other ends of the first and second inlet / outlet pipes 61 and 62 are respectively connected to two valve ports of the four-way valve 7. The main inlet pipe 2 and the main exhaust pipe 3 are connected to the other two valve ports of the four-way valve 7. It is understood that by using one four-way valve 7 to replace four switching valves, the control actuators are reduced from four to one, reducing valve failure points and ensuring continuous operation of the porous media combustion device 1. The main fault-prone components in the porous media combustion device 1 are the automatic equipment fan, the ignition burner, and the automatic control valves. The above-mentioned configuration can reduce the equipment failure rate by approximately 50%. Furthermore, by replacing four automatic control valves with a single four-way valve 7, the number of openings for the gas inlet and outlet connection pipes on both sides of the combustion device is reduced from four to two, and the number of supporting pipes is also reduced accordingly, saving more than 20% of space. This greatly benefits the integration and miniaturization of the equipment. In terms of valve investment cost, the cost of a four-way valve 7 with the same diameter and configuration is about 1.5 times that of an on / off valve, resulting in an overall cost reduction of over 60%.

[0045] In some embodiments, the four-way valve 7 includes at least a first position and a second position. When the four-way valve 7 is in the first position, the main intake pipe 2 is connected to the first intake / exhaust pipe 61, and the main exhaust pipe 3 is connected to the second intake / exhaust pipe 62. When the four-way valve 7 is in the second position, the main intake pipe 2 is connected to the second intake / exhaust pipe 62, and the main exhaust pipe 3 is connected to the first intake / exhaust pipe 61. It is understood that when it is necessary to switch the intake / exhaust direction of the porous medium combustion device 1, it is only necessary to switch the four-way valve 7 from the first position to the second position, or from the second position to the first position. The control is simple and convenient, the switching is rapid, and the continuity of the porous combustion device operation is improved. In other embodiments, the four-way valve 7 may also include other positions, such as a cut-off position, where all pipes are disconnected, facilitating pipe inspection and maintenance.

[0046] In some embodiments, the reciprocating porous media VOCs combustion device further includes a three-way valve 8, through which the main exhaust pipe 3 is selectively connected to the flue gas pipe 5 or the return gas pipe 4. It is understood that placing the return gas pipe 4 at the end of the main exhaust pipe 3 can receive untreated VOCs gas remaining in the pipe when the first inlet / outlet pipe 61 or the second inlet / outlet pipe 62 switches its inlet / outlet direction, preventing emission peaks that could lead to excessive emissions and environmental pollution. Furthermore, reducing the number of pipes simplifies pipeline design, and the three-way valve 8 reduces the use of switching valves, lowers potential failure points, and ensures stable and continuous operation of the equipment. The three-way valve 8 includes at least two positions to connect the main exhaust pipe 3 to the flue gas pipe 5 or the return gas pipe 4. Both the three-way valve 8 and the four-way valve 7 are automatic control valves, capable of automatically controlling the switching of valve positions to achieve continuous operation of the equipment. In other embodiments, the three-way valve 8 may also include other positions, such as a shut-off position, where all pipes are disconnected for easier pipe inspection and maintenance.

[0047] In some embodiments, the reciprocating porous media VOCs combustion device further includes an LEL gas concentration detector 23, which is installed on the main intake pipe 2 and located on one side of the intake end of the buffer gas tank 21. The LEL gas concentration detector 23 is a safety device used to monitor the concentration of combustible gases in the environment; it is also called a combustible gas concentration detector. LEL stands for Lower Explosive Limit, which refers to the lowest explosive limit of a gas in air. It is understood that by installing the LEL gas concentration detector 23 on the main intake pipe 2, the concentration of combustible gases flowing into the main intake pipe 2 can be detected. If the detected combustible gas concentration exceeds the standard or approaches a dangerous value, the combustible gas input must be shut off or reduced. Because the LEL gas concentration detector 23 has a sampling and analysis time, the buffer tank 21 ensures that the VOCs exhaust gas has a certain residence time within the tank. This time is typically greater than the sum of the response time of the LEL gas concentration detector 23 and the valve action time (the response time of the LEL gas concentration detector 23 is adjustable, usually designed for 5-10 seconds). This allows the LEL gas concentration detector 23 to promptly issue a signal when the VOCs intake concentration exceeds the limit, causing all intake valves to close. The buffer tank 21 prevents gases with excessive concentrations from directly entering the porous media combustion device 1, avoiding potential hazards and ensuring equipment safety. Furthermore, for skid-mounted processing equipment, the buffer tank 21 can be installed together with the porous media combustion device 1 on the skid base, allowing for transport to different oil and gas stations. It offers high integration and is not limited by site constraints.

[0048] In some embodiments, a venting component is also provided on the outlet end of the buffer gas tank 21 or on the main inlet pipe 2 on one side of the outlet end of the buffer gas tank 21. Upon detection of an excessive combustible gas concentration, to ensure equipment production safety, the gas in the buffer gas tank 21 is directly discharged, completely eliminating safety hazards. It is understood that the combustible gas concentration of the gas recovered by the return gas pipe 4 is within the acceptable range when it first enters the main inlet pipe 2, and the recovered gas is only a small amount. Even if the LEL gas concentration detector 23 is placed upstream of the connection point between the return gas pipe 4 and the main inlet pipe 2, that is, if the recovered gas is directly stored in the buffer gas tank 21 without detection, it will not cause the combustible gas concentration to exceed the limit.

[0049] In other embodiments, where space permits at the installation site, the delay function of the buffer gas tank 21 can be replaced by a section of gas pipeline. When the distance from the gas source to the equipment installation point is sufficient, a longer main inlet pipeline 2 can serve as a delay function. When the distance from the gas source to the equipment installation point is insufficient, a section of the main inlet pipeline 2 can be replaced with a pipeline with a larger diameter, utilizing the fact that a larger diameter pipeline has a slower flow rate under the same gas pressure to delay the time it takes for the exhaust gas to reach the treatment equipment.

[0050] In some embodiments, the external gas supply pipeline can supply one or any two or more of the following: combustion-supporting gas, fuel gas, and VOCs gas. The combustion-supporting gas is, for example, air. The gas from the external gas supply pipeline flows into the main intake pipe 2 and enters the buffer gas tank 21 to reduce the complexity of the pipeline design, so that the various gases are initially mixed in the main intake pipe 2, and it is also convenient for the LEL gas concentration detector 23 to detect.

[0051] In some embodiments, a pressure gauge is provided on the buffer tank 21. It is understood that providing a pressure gauge on the buffer tank 21 allows for easy and intuitive viewing of the current pressure value of the buffer tank 21, indirectly reflecting whether the current pipeline is operating normally and whether the power of the induced draft fan 22 is appropriate.

[0052] For ease of understanding, the workflow of this utility model in some specific embodiments is described as follows:

[0053] like Figure 1 As shown, during the first cycle, when the valve plate inside the four-way valve 7 is in the vertical position, i.e., in the first working position, the main intake pipe 2 is connected to the first intake and exhaust pipe 61. The waste gas to be treated (VOCs gas) enters the furnace through the first intake and exhaust port 11 of the porous media combustion device 1 via the induced draft fan 22. After incineration, the purified flue gas is discharged through the second intake and exhaust port 12, the second intake and exhaust pipe 62, and the main exhaust pipe 3. At this time, the valve plate inside the three-way valve 8 is in the horizontal position, and the flue gas is discharged through the three-way valve 8 to the chimney, completing one treatment cycle. To visually represent the above description, the blue part in the figure represents intake, and the red part represents exhaust or return gas.

[0054] In the second processing cycle, after the equipment receives the switching signal, such as Figure 2 As shown, when the valve plate inside the four-way valve 7 is switched to a horizontal position under the action of the control mechanism (such as an automatic actuator), that is, when it is in the second working position, the valve plate of the three-way valve 8 is switched to a vertical position, and the main air intake pipe 2 is switched to be connected to the second air intake and exhaust pipe 62. The waste gas to be treated enters the furnace from the second air intake and exhaust port 12 of the porous media combustion device 1. At this time, a small amount of VOCs waste gas remains in the first air intake and exhaust pipe 61 and is not completely treated. It will flow back to the buffer gas tank 21 along with the purified flue gas from the main exhaust pipe 3, the three-way valve 8, and the return gas pipe 4, and be drawn in by the induced draft fan 22 for circulation treatment. The duration is about 10 seconds. It can be understood that the specific duration is determined by different pipe diameters, the power of the porous media combustion device 1, and the power of the induced draft fan 22. No specific limit is made on the duration. In this embodiment, 10 seconds is used as an example.

[0055] like Figure 3 As shown, after 10 seconds, the valve plate of the three-way valve 8 switches to the horizontal position, and the main air inlet pipe 2 is connected to the second air inlet and outlet pipe 62. When the waste gas to be treated enters the device through the induced draft fan 22, it enters the furnace through the second air inlet and outlet port 12 of the porous medium combustion device 1. After incineration, it is discharged through the first air inlet and outlet port 11, and finally transported to the chimney for discharge through the first air inlet and outlet pipe 61, the main exhaust pipe 3, the three-way valve 8 and the flue pipe 5, thus completing the second treatment cycle.

[0056] like Figure 4 As shown, at the start of the third cycle, the valve plate inside the four-way valve 7 is in the vertical position, that is, it switches back to the first working position. The valve plate of the three-way valve 8 is in the vertical position. The main air inlet pipe 2 is connected to the first air inlet and outlet pipe 61. The waste gas to be treated enters the furnace through the first air inlet and outlet 11 of the porous medium combustion device 1 via the induced draft fan 22. After combustion treatment, the purified flue gas is discharged through the second air inlet and outlet 12, the second air inlet and outlet pipe 62, and the main exhaust pipe 3. At this time, the residual waste gas in the second air inlet and outlet pipe 62 will return to the buffer gas tank 21 along with the purified flue gas for recirculation. After 10 seconds, the valve plate of the three-way valve 8 switches to the horizontal position. Figure 1 (Status), the purified flue gas is discharged from the exhaust pipe 5 to the chimney, completing the third treatment cycle.

[0057] This process repeats itself continuously, with the valve switching cycle repeating. For the first 10 seconds after each valve switch, the valve plate of the three-way valve 8 is switched to ensure that the residual exhaust gas in the pipeline can be completely incinerated by the porous medium combustion device 1 before being discharged.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A reciprocating porous media VOCs combustion device, characterized in that, It includes a porous medium combustion device (1) and a main intake pipe (2), a main exhaust pipe (3), a return pipe (4) and a smoke exhaust pipe (5) connected to the porous medium combustion device (1); The porous medium combustion device (1) includes a first air inlet / outlet (11) and a second air inlet / outlet (12); One end of the main air intake pipe (2) is connected to an external air supply pipe, and the other end can be selectively connected to the first air inlet / outlet (11) or the second air inlet / outlet (12) of the porous medium combustion device (1). One end of the main exhaust pipe (3) can be selectively connected to the first air inlet / outlet (11) or the second air inlet / outlet (12) of the porous medium combustion device (1), and the other end can be selectively connected to the return gas pipe (4) or the smoke exhaust pipe (5). The main intake pipe (2) is connected to a buffer gas tank (21) and an induced draft fan (22). The induced draft fan (22) is used to deliver gas to the porous medium combustion device (1) and at the same time keep the buffer gas tank (21) under negative pressure. The end of the return gas pipe (4) away from the main exhaust pipe (3) is connected to the intake end of the buffer gas tank.

2. The reciprocating porous media VOCs combustion device according to claim 1, characterized in that, It also includes a first inlet / outlet pipe (61), a second inlet / outlet pipe (62), and a four-way valve (7). One end of the first inlet / outlet pipe (61) is connected to the first inlet / outlet port (11), and one end of the second inlet / outlet pipe (62) is connected to the second inlet / outlet port (12). The other end of the first inlet / outlet pipe (61) and the other end of the second inlet / outlet pipe (62) are respectively connected to two of the valve ports of the four-way valve (7). The main inlet pipe (2) and the main exhaust pipe (3) are connected to the other two valve ports of the four-way valve (7).

3. The reciprocating porous media VOCs combustion device according to claim 2, characterized in that, The four-way valve (7) includes at least a first position and a second position. When the four-way valve (7) is in the first position, the main intake pipe (2) is connected to the first intake and exhaust pipe (61), and the main exhaust pipe (3) is connected to the second intake and exhaust pipe (62). When the four-way valve (7) is in the second position, the main intake pipe (2) is connected to the second intake and exhaust pipe (62), and the main exhaust pipe (3) is connected to the first intake and exhaust pipe (61).

4. The reciprocating porous media VOCs combustion device according to claim 2, characterized in that, It also includes a three-way valve (8), through which the main exhaust pipe (3) is selectively connected to the smoke exhaust pipe (5) or the return gas pipe (4).

5. The reciprocating porous media VOCs combustion device according to claim 4, characterized in that, Both the four-way valve (7) and the three-way valve (8) are automatic control valves.

6. The reciprocating porous media VOCs combustion device according to any one of claims 1-5, characterized in that, It also includes an LEL gas concentration detector (23), which is installed on the main air intake pipe (2) and located on one side of the air intake end of the buffer gas tank (21).

7. The reciprocating porous media VOCs combustion device according to any one of claims 1-5, characterized in that, A heat storage body (14) is provided between the first air inlet / outlet (11) and the porous medium (13) and between the second air inlet / outlet (12) and the porous medium (13) of the porous medium combustion device (1).

8. The reciprocating porous media VOCs combustion device according to any one of claims 1-5, characterized in that, The external gas supply pipeline can supply combustion-supporting gas and / or fuel gas and / or VOCs gas, and the gas from the external gas supply pipeline flows into the main air intake pipeline (2) and enters the buffer gas tank (21).

9. The reciprocating porous media VOCs combustion device according to any one of claims 1-5, characterized in that, A pressure gauge is installed on the buffer gas tank (21).

10. The reciprocating porous media VOCs combustion device according to any one of claims 1-5, characterized in that, The end of the exhaust pipe (5) away from the main exhaust pipe (3) is connected to the chimney.

Images