Waste gas treatment equipment and treatment method

Abstract

The waste gas treatment equipment comprises a combustion tower, a switching device, a fan and a gas storage box, the combustion tower comprises a first combustion cavity and a second combustion cavity, the switching device comprises a first gas inlet, a first gas outlet and a second gas outlet, the first gas inlet is connected with the fan, and the second gas outlet is connected with the fan. The air storage box comprises a second air inlet, a third air outlet and a fourth air outlet, the second air inlet is connected with the second air outlet, the third air outlet is connected with the first air outlet, the fourth air outlet is connected with the fan, the first air outlet is provided with a first electromagnetic valve, and the second air outlet is provided with a second electromagnetic valve. The first electromagnetic valve and the second electromagnetic valve are switched to be opened, a gas storage channel is formed in the gas storage box, the second gas inlet and the third gas outlet are located in the two ends of the gas storage channel, and the fourth gas outlet communicates with the gas storage channel and the draught fan. By arranging the gas storage box, untreated waste gas can be recycled when the gas flow direction of the combustion tower is switched, and waste gas treatment is more sufficient.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and more specifically, to a waste gas treatment device and a treatment method. Background Art

[0002] In the prior art, the existing thermal oxidation furnace using combustion treatment is generally equipped with two combustion towers. By switching the direction of the exhaust gas back and forth, the exhaust gas introduced into the thermal oxidation furnace can be fully oxidized and burned, thereby preventing the internal ceramic plate from overheating and saving energy consumption. Referring to the organic waste gas thermal oxidation device with authorization announcement number CN201454389U, when the combustion tower in the application switches the exhaust gas flow direction, that is, when the two pairs of inlet and exhaust valves are operating alternately, when the intake valve 11 is switched to connect the exhaust valve 22 to the intake valve 21 to connect the exhaust valve 12, since part of the exhaust gas that has just entered through the intake valve 11 is still in the regeneration bed 1, when the exhaust valve 21 is switched to pass the exhaust gas, the exhaust gas that has not been burned in the regeneration bed 1 will be discharged from the exhaust valve 12, and the exhaust gas treatment is incomplete, resulting in the exhaust gas emission failing to meet the standard. Therefore, a technical solution is needed to solve the above problem. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to make waste gas treatment more adequate, and to provide a waste gas treatment device and a treatment method.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] The present invention discloses an exhaust gas treatment device and a treatment method, comprising a combustion tower, a switching device, a fan, and an air storage box, wherein the combustion tower comprises a first combustion chamber and a second combustion chamber, the combustion tower is connected to the switching device, the switching device comprises a first air inlet, a first air outlet, and a second air outlet, the first air inlet is connected to the fan, the switching device can switch the direction of the airflow in the first combustion chamber and the second combustion chamber, the air storage box comprises a second air inlet, a third air outlet, and a fourth air outlet, the second air inlet is connected to the second air outlet, the third air outlet is connected to the first air outlet, the fourth air outlet is connected to the fan, the first air outlet is provided with a first solenoid valve, the second air outlet is provided with a second solenoid valve, the first solenoid valve and the second solenoid valve are switched on, an air storage channel is provided in the air storage box, the second air inlet and the third air outlet are respectively located at two ends of the air storage channel, and the fourth air outlet connects the air storage channel and the fan.

[0006] Furthermore, a plurality of partitions are provided in the air storage box, and the plurality of partitions divide the interior of the air storage box to form the air storage channel, and the air storage channel is in a maze shape.

[0007] Furthermore, the fourth air outlet is located at one end of the air storage channel close to the second air inlet.

[0008] Further, the switching device includes a first switching valve and a second switching valve, the first switching valve includes a first valve core, a first air inlet chamber, a first connecting chamber, and a first air outlet chamber, the second switching valve includes a second valve core, a second air inlet chamber, a second connecting chamber, and a second air outlet chamber, a first valve port is provided between the first air inlet chamber and the first connecting chamber, a second valve port is provided between the first air outlet chamber and the first connecting chamber, the first valve core can switch to open the first valve port and the second valve port, a third valve port is provided between the second air inlet chamber and the second connecting chamber, a fourth valve port is provided between the second air outlet chamber and the second connecting chamber, the second valve core can switch to open the third valve port and the fourth valve port, the first air inlet chamber is connected to the second air inlet chamber, the first air outlet chamber is connected to the second air outlet chamber, the first connecting chamber is connected to the first combustion chamber, and the second connecting chamber is connected to the second combustion chamber.

[0009] Furthermore, the first air inlet is connected to the first air inlet cavity, and the first air outlet and the second air outlet are connected to the second air outlet cavity.

[0010] Furthermore, the switching device includes a first state and a second state. In the first state, the first valve core closes the second valve port, the first air inlet chamber is connected to the first combustion chamber, the second valve core closes the third valve port, and the second combustion chamber is connected to the second air outlet chamber. In the second state, the first valve core closes the first valve port, the first combustion chamber is connected to the first air outlet chamber, the second valve core closes the fourth valve port, and the second air inlet chamber is connected to the second combustion chamber.

[0011] A method for treating waste gas, based on the waste gas treatment equipment described above, comprises the following steps:

[0012] S1: The switching device is in the first state. In the first state, the fan sends the exhaust gas into the first switching valve of the switching device. The exhaust gas enters the first air inlet chamber of the first switching valve and then enters the first connecting chamber. The exhaust gas passes through the first combustion chamber and the second combustion chamber of the combustion tower for combustion and oxidation. The exhaust gas after combustion enters the second air outlet chamber through the second connecting chamber. The first solenoid valve is opened, the second solenoid valve is closed, and the exhaust gas is finally sent out from the first air outlet.

[0013] S2: The switching device switches from the first state to the second state, and the fan sends the exhaust gas into the first switching valve of the switching device. The exhaust gas enters the first air inlet chamber of the first switching valve and then enters the second air inlet chamber. The exhaust gas passes through the second combustion chamber and the first combustion chamber of the combustion tower for combustion and oxidation. The burned exhaust gas enters the first air outlet chamber and the second air outlet chamber through the first connecting chamber. The first solenoid valve is closed and the second solenoid valve is opened, so that the untreated exhaust gas that has just entered the first combustion chamber in S1 enters the air storage box and fills the air storage box. The first solenoid valve is opened and the second solenoid valve is closed. The subsequent exhaust gas from the second air outlet chamber is discharged through the first air outlet. The exhaust gas in the air storage box is extracted through the fan connected to the fourth air outlet, and the exhaust gas in the air storage box re-enters the combustion tower for oxidation.

[0014] S3: The subsequent switching device switches from the second state to the first state or from the first state to the second state, and the first solenoid valve and the second solenoid valve repeat the switching method in S2.

[0015] The beneficial effects of the present invention are:

[0016] The present invention arranges an air storage box at the exhaust gas output end of the switching device. The air storage box can temporarily store the untreated exhaust gas during the switching process of the combustion tower. The fan can continuously send the exhaust gas in the air storage box to the combustion tower, and can re-treat the untreated exhaust gas during the switching process, so that the exhaust gas finally sent out from the first exhaust port is all treated exhaust gas, so that the exhaust gas treatment is more complete and the treatment effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of this embodiment.

[0018] Figure 2 for Figure 1 Cross-sectional view along the A direction.

[0019] Figure 3 1 is a cross-sectional view of the air storage box in this embodiment.

[0020] Figure numerals: 1, combustion tower; 11, first combustion chamber; 12, second combustion chamber; 2, switching device; 21, first switching valve; 211, first valve core; 212, first air inlet chamber; 2121, first valve port; 213, first connecting chamber; 214, first air outlet chamber; 2141, second valve port; 22, second switching valve; 221, second valve core; 222, second air inlet chamber; 2221, third valve port; 223, second connecting chamber; 224, second air outlet chamber; 2241, fourth valve port; 23, first air inlet; 24, first air outlet; 241, first solenoid valve; 25, second air outlet; 251, second solenoid valve; 3, fan; 4, air storage box; 41, second air inlet; 42, third air outlet; 43, fourth air outlet; 44, air storage channel; 45, partition. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in this embodiment to clearly and completely describe the technical solution in this embodiment. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment discloses a waste gas treatment equipment, including a combustion tower 1, a switching device 2, a fan 3, and an air storage box 4. The combustion tower 1 includes a first combustion chamber 11 and a second combustion chamber 12. The upper ends of the first combustion chamber 11 and the second combustion chamber 12 are interconnected. The structure of the combustion tower 1 refers to the organic waste gas thermal oxidation device with authorization announcement number CN201454389U.

[0023] The combustion tower 1 is connected to a switching device 2, which can switch the direction of the airflow in the first combustion chamber 11 and the second combustion chamber 12. The switching device 2 includes a first switching valve 21, a second switching valve 22, a first air inlet 23, a first air outlet 24, and a second air outlet 25. The first switching valve 21 includes a first valve core 211, a first air inlet chamber 212, a first connecting chamber 213, and a first air outlet chamber 214. A first valve port 2121 is provided between the first air inlet chamber 212 and the first connecting chamber 213. The first air outlet chamber 214 and the first connecting chamber 214 are connected to each other. A second valve port 2141 is provided between the cavities 213, the first valve core 211 can switch to open the first valve port 2121 and the second valve port 2141, the first switching valve 21 is connected to the first combustion chamber 11, the first connecting chamber 213 is connected to the first combustion chamber 11, the first valve core 211 can enable the first combustion chamber 11 to switch to connect the first air inlet chamber 212 and the first air outlet chamber 214, the first air inlet port 23 is connected to the first air inlet chamber 212, the first air inlet port 23 is connected to the fan 3, and the fan 3 delivers the exhaust gas to be treated into the first air inlet chamber 212.

[0024] The second switching valve 22 includes a second valve core 221, a second air inlet chamber 222, a second connecting chamber 223, and a second air outlet chamber 224. A third valve port 2221 is provided between the second air inlet chamber 222 and the second connecting chamber 223. A fourth valve port 2241 is provided between the second air outlet chamber 224 and the second connecting chamber 223. The second valve core 221 can switch to open the third valve port 2221 and the fourth valve port 2241. The second switching valve 22 is connected to the second combustion chamber 12. The second connecting chamber 223 is connected to the second combustion chamber 12. The second valve core 221 can switch the second combustion chamber 12 to connect to the second air inlet chamber 222 and the second air outlet chamber 224. The first air outlet 24 is connected to the second air outlet chamber 224. The first air outlet 24 discharges the treated exhaust gas.

[0025] The first air inlet chamber 212 is connected to the second air inlet chamber 222, and the first air outlet chamber 214 is connected to the second air outlet chamber 224. The switching device 2 includes a first state and a second state. In the first state, the first valve core 211 closes the second valve port 2141, the first air inlet chamber 212 is connected to the first combustion chamber 11, the second valve core 221 closes the third valve port 2221, and the second combustion chamber 12 is connected to the second air outlet chamber 224. The exhaust gas enters the first air inlet chamber 212 through the fan 3 and enters the first combustion chamber 11 through the first connecting chamber 213. The exhaust gas is burned and oxidized from the first combustion chamber 11 through the second combustion chamber 12. The treated exhaust gas passes through the second combustion chamber 12 and the second connecting chamber 223 into the second air outlet chamber 224, and is finally discharged through the first air outlet 24.

[0026] In the second state, the first valve core 211 closes the first valve port 2121, the first combustion chamber 11 is connected to the first air outlet chamber 214, the second valve core 221 closes the fourth valve port 2241, the second air inlet chamber 222 is connected to the second combustion chamber 12, and the exhaust gas enters the first air inlet chamber 212 through the fan 3, passes through the second air inlet chamber 222, and enters the second combustion chamber 12 through the second connecting chamber 223. The exhaust gas passes from the second combustion chamber 12 through the first combustion chamber 11 for combustion and oxidation. The treated exhaust gas passes through the first combustion chamber 11, passes through the first connecting chamber 213, enters the first air outlet chamber 214, and enters the second air outlet chamber 224 from the first air outlet chamber 214. Finally, the treated exhaust gas is discharged through the first air outlet port 24.

[0027] The second air outlet 25 is connected to the second air outlet cavity 224. The air storage box 4 includes a second air inlet 41, a third air outlet 42, and a fourth air outlet 43. The second air inlet 41 is connected to the second air outlet 25, the third air outlet 42 is connected to the first air outlet 24, and the fourth air outlet 43 is connected to the fan 3. The first air outlet 24 is provided with a first solenoid valve 241, and the second air outlet 25 is provided with a second solenoid valve 251. The first solenoid valve 241 and the second solenoid valve 251 are switched on. When the switching device 2 is switched from the first state to the second state or from the second state to the first state, the first solenoid valve 241 is closed and the second solenoid valve 251 is opened for several seconds, so that the exhaust gas just entering the first combustion chamber 11 or the second combustion chamber 12 before switching is sent into the air storage box 4. For example: It can be known that wind pressure (Pa) = 0.5×air density (kg / m 3 )×wind speed 2 (m / s), exhaust gas inlet temperature 40 degrees Celsius, air density 1.128kg / m 3 The volume of the air storage tank 4 is 6m×2m×6m=72m 3 The switching time between the first valve core 211 and the second valve core 221 is 2 seconds. During the 2 seconds of switching, the air inlet pressure of the air storage box 4 is 300-800 Pa, the calculated wind speed is 12.6-33.6 m / s, the air inlet size of the air storage box 4 is 0.8 m×0.8 m, and the air intake volume is 0.8 m×0.8 m×33.6 m / s×2=43 m 3 The second solenoid valve 251 of the air tank 4 is opened for 5 seconds. The wind pressure is 300Pa for 3 seconds after the switching is completed, and the air intake volume is 0.8m×0.8m×12.6m / s×3=24.2m 3 The total air intake is 67.2m 3 , so the volume of air tank 4 is 72m 3 Meet the requirements, the untreated exhaust gas in combustion tower 1 is 3m×3m×2m=18m 3 3 seconds after the switch is completed, the gas released is 24.2m 3 , and also meets the requirements, so that part of the exhaust gas that has not been burned and oxidized is temporarily stored in the air storage box 4, and a plurality of partitions 45 are arranged in the air storage box 4, and the plurality of partitions 45 divide the interior of the air storage box 4 into an air storage channel 44, and the air storage channel 44 is in a maze shape, which can slow down the flow rate of the gas entering the second air inlet 41, and reduce the impact of the gas entering the air storage box 4 from the second air inlet 41 on the fan 3. The second air inlet 41 and the third air outlet 42 are respectively located at the two ends of the air storage channel 44, and the fourth air outlet 43 connects the air storage channel 44 and the fan 3. The fan 3 can continuously send the exhaust gas in the air storage box 4 to the combustion tower 1, and the negative pressure of the fan 3 is -200Pa, and the wind speed is 17m / s. The diameter of the exhaust air duct connected to the fourth air outlet 43 is 0.2m, and a switching cycle is 180s. The amount of exhaust is 0.2m×0.2m×3.14×17m / s×180s=384m3 , and can also draw back all the exhaust gas in the air storage box 4, and can re-process the untreated exhaust gas during the switching process, so that the exhaust gas finally sent out from the first air outlet 24 is all treated exhaust gas, making the exhaust gas treatment more complete and the treatment effect better.

[0028] More preferably, the fourth air outlet 43 is located at one end of the air storage channel 44 close to the second air inlet 41, and the fan 3 can extract air from the end close to the second air inlet 41. The fan 3 can play a traction role, can timely re-transmit the exhaust gas entering the air storage box 4, and can extract the exhaust gas in the air storage channel 44 from the third air outlet 42 to the fourth air outlet 43, so as to prevent the exhaust gas from flowing out directly from the third air outlet 42. The third air outlet 42 is connected to the first air outlet 24, so that the external clean or treated air re-fills the air storage channel 44, and when the second air inlet 41 takes in air next time, the clean air in the air storage channel 44 is sent to the first air outlet 24 through the third air outlet 42.

[0029] This embodiment also discloses a waste gas treatment method, based on the waste gas treatment equipment described above, comprising the following steps:

[0030] Step 1: The switching device 2 is in the first state, the first valve core 211 closes the second valve port 2141, the first air inlet chamber 212 is connected to the first combustion chamber 11, the second valve core 221 closes the third valve port 2221, and the second combustion chamber 12 is connected to the second air outlet chamber 224. In the first state, the fan 3 sends the exhaust gas into the first switching valve 21 of the switching device 2, and the exhaust gas enters the first air inlet chamber 212 of the first switching valve 21 and then enters the first connecting chamber 213. The exhaust gas passes through the first combustion chamber and the second combustion chamber of the combustion tower 1 for combustion and oxidation. The exhaust gas after combustion enters the second air outlet chamber 224 through the second connecting chamber 223. At this time, the first solenoid valve 241 is opened, and the second solenoid valve 251 is closed, and the exhaust gas is finally sent out from the first air outlet 24.

[0031] Step 2: When the switching device 2 is switched from the first state to the second state, the first valve core 211 closes the first valve port 2121, the first combustion chamber 11 is connected to the first air outlet chamber 214, the second valve core 221 closes the fourth valve port 2241, the second air inlet chamber 222 is connected to the second combustion chamber 12, the fan 3 sends the exhaust gas into the first switching valve 21 of the switching device 2, the exhaust gas enters the first air inlet chamber 212 of the first switching valve 21 and then enters the second air inlet chamber 222, the exhaust gas passes through the second combustion chamber and the first combustion chamber of the combustion tower 1 for combustion and oxidation, and the exhaust gas after combustion The exhaust gas enters the first air outlet chamber 214 and the second air outlet chamber 224 through the first connecting chamber 213, the first solenoid valve 241 is closed, and the second solenoid valve 251 is opened, so that part of the untreated exhaust gas that has just entered the first combustion chamber 11 in step one enters the air storage box 4 and fills the air storage box 4, the first solenoid valve 241 is opened, and the second solenoid valve 251 is closed, and the subsequent exhaust gas from the second air outlet chamber 224 is discharged through the first air outlet 24, and the exhaust gas in the air storage box 4 is extracted through the fan 3 connected to the fourth air outlet 43, and the exhaust gas in the air storage box 4 re-enters the combustion tower 1 for oxidation.

[0032] Step 3: Subsequently, the switching device 2 switches from the second state to the first state or from the first state to the second state, and the first solenoid valve 241 and the second solenoid valve 251 repeat the switching method in step 2.

[0033] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A waste gas treatment device, characterized in that: The invention comprises a combustion tower (1), a switching device (2), a fan (3), and an air storage box (4); the combustion tower (1) comprises a first combustion chamber (11) and a second combustion chamber (12); the combustion tower (1) is connected to the switching device (2); the switching device (2) comprises a first air inlet (23), a first air outlet (24), and a second air outlet (25); the first air inlet (23) is connected to the fan (3); the switching device (2) is capable of switching the direction of airflow in the first combustion chamber (11) and the second combustion chamber (12); the air storage box (4) comprises a second air inlet (41), a third air outlet (42), and a fourth air outlet (43); the second air inlet (4 1) connected to the second air outlet (25), the third air outlet (42) connected to the first air outlet (24), the fourth air outlet (43) connected to the fan (3), the first air outlet (24) is provided with a first solenoid valve (241), the second air outlet (25) is provided with a second solenoid valve (251), the first solenoid valve (241) and the second solenoid valve (251) are switched on, an air storage channel (44) is provided in the air storage box (4), the second air inlet (41) and the third air outlet (42) are respectively located at two ends of the air storage channel (44), and the fourth air outlet (43) is connected to the air storage channel (44) and the fan (3).

2. The exhaust gas treatment equipment according to claim 1, characterized in that: A plurality of partitions (45) are arranged inside the air storage box (4), and the plurality of partitions (45) divide the interior of the air storage box (4) to form the air storage passage (44), and the air storage passage (44) is in a labyrinth shape.

3. The exhaust gas treatment equipment according to claim 1, characterized in that: The fourth air outlet (43) is located at one end of the air storage channel (44) close to the second air inlet (41).

4. The exhaust gas treatment equipment according to claim 1, characterized in that: The switching device (2) comprises a first switching valve (21) and a second switching valve (22); the first switching valve (21) comprises a first valve core (211), a first air inlet cavity (212), a first connecting cavity (213), and a first air outlet cavity (214); the second switching valve (22) comprises a second valve core (221), a second air inlet cavity (222), a second connecting cavity (223), and a second air outlet cavity (224); a first valve port (2121) is provided between the first air inlet cavity (212) and the first connecting cavity (213); a second valve port (2141) is provided between the first air outlet cavity (214) and the first connecting cavity (213); the first valve core (211) is capable of switching to open the first valve core; A third valve port (2221) is provided between the second air inlet chamber (222) and the second connecting chamber (223), a fourth valve port (2241) is provided between the second air outlet chamber (224) and the second connecting chamber (223), the second valve core (221) is capable of switching to open the third valve port (2221) and the fourth valve port (2241), the first air inlet chamber (212) is connected to the second air inlet chamber (222), the first air outlet chamber (214) is connected to the second air outlet chamber (224), the first connecting chamber (213) is connected to the first combustion chamber (11), and the second connecting chamber (223) is connected to the second combustion chamber (12).

5. The exhaust gas treatment equipment according to claim 4, characterized in that: The first air inlet (23) is connected to the first air inlet cavity (212), and the first air outlet (24) and the second air outlet (25) are connected to the second air outlet cavity (224).

6. The exhaust gas treatment equipment according to claim 4, characterized in that: The switching device (2) includes a first state and a second state. In the first state, the first valve core (211) closes the second valve port (2141), the first air intake chamber (212) is connected to the first combustion chamber (11), the second valve core (221) closes the third valve port (2221), and the second combustion chamber (12) is connected to the second air outlet chamber (224). In the second state, the first valve core (211) closes the first valve port (2121), the first combustion chamber (11) is connected to the first air outlet chamber (214), the second valve core (221) closes the fourth valve port (2241), and the second air intake chamber (222) is connected to the second combustion chamber (12).

7. A method for treating waste gas, based on the waste gas treatment equipment according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: the switching device (2) is in a first state. In the first state, the fan (3) sends the exhaust gas into the first switching valve (21) of the switching device (2). The exhaust gas enters the first air inlet chamber (212) of the first switching valve (21) and then enters the first connecting chamber (213). The exhaust gas passes through the first combustion chamber and the second combustion chamber of the combustion tower (1) for combustion and oxidation. The exhaust gas after combustion passes through the second connecting chamber (223) and enters the second air outlet chamber (224). The first electromagnetic valve (241) is opened, and the second electromagnetic valve (251) is closed. The exhaust gas is finally sent out from the first air outlet (24); S2: The switching device (2) switches from the first state to the second state, the fan (3) sends the exhaust gas into the first switching valve (21) of the switching device (2), the exhaust gas enters the first air inlet chamber (212) of the first switching valve (21) and then enters the second air inlet chamber (222), the exhaust gas passes through the second combustion chamber and the first combustion chamber of the combustion tower (1) for combustion and oxidation, the exhaust gas after combustion passes through the first connecting chamber (213) and enters the first air outlet chamber (214) and the second air outlet chamber (224), the first solenoid valve (241) ) is closed and the second solenoid valve (251) is opened, so that the untreated waste gas in S1 that has just entered the first combustion chamber (11) enters the gas storage box (4) and fills the gas storage box (4), the first solenoid valve (241) is opened, the second solenoid valve (251) is closed, and the subsequent waste gas from the second gas outlet chamber (224) is discharged through the first gas outlet (24), the waste gas in the gas storage box (4) is drawn out through the fan (3) connected to the fourth gas outlet (43), and the waste gas in the gas storage box (4) re-enters the combustion tower (1) for oxidation; S3: The subsequent switching device (2) switches from the second state to the first state or from the first state to the second state, and the first solenoid valve (241) and the second solenoid valve (251) repeat the switching method in S2.

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