CN110732244A - an exhaust gas treatment system - Google Patents

Abstract

An exhaust gas treatment system, comprising a regenerative catalytic furnace, a catalytic air inlet and a catalytic air outlet are provided at the bottom of the thermal storage catalytic furnace; the catalytic air inlet and the catalytic air outlet are connected with one open and two pipes, so the catalytic air inlet and the catalytic air outlet are connected. The catalytic air inlet includes: a first catalytic air inlet and a second catalytic air inlet, and the catalytic air outlet includes: a first catalytic air outlet and a second catalytic air outlet; between the first catalytic air outlet and the second catalytic air outlet A partition is installed between the catalytic air outlets, the first catalytic air inlet and the second catalytic air outlet form a working group; the second catalytic air inlet and the first catalytic air outlet form a working group, The regenerative catalytic furnace is changed to an exchange-type air inlet and outlet and a cooling device is added to the regenerative catalytic furnace, which solves the problems of low thermal energy utilization rate and insufficient safety of the existing regenerative catalytic furnace.

Description

an exhaust gas treatment system

technical field

The invention belongs to the field of waste gas treatment, and more particularly relates to a waste gas treatment system.

Background technique

With the increasing awareness of environmental protection in our country, many exhaust gas treatment systems have gradually appeared, but the thermal energy utilization rate of the regenerative catalytic furnace is not high in the existing exhaust gas treatment systems. Usually, the end of the intake air in the regenerative catalytic furnace needs to be heated continuously, so that the exhaust gas has enough temperature to be catalytically decomposed when passing through the catalyst. Moreover, the existing exhaust gas treatment system lacks protection measures, and if the temperature of the regenerative catalytic furnace and the activated carbon bed is too high, the temperature thereof cannot be effectively controlled. It is easy to cause equipment damage and personal casualties.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a waste gas treatment system in view of the defects in the background technology, changing the regenerative catalytic furnace into an exchange-type air inlet and outlet and adding a cooling device to the regenerative catalytic furnace, so as to solve the problem of the existing regenerative catalytic furnace. The problem of low utilization rate of thermal energy and insufficient safety.

For this purpose, the present invention adopts the following technical solutions:

An exhaust gas treatment system, comprising a regenerative catalytic furnace, a catalytic air inlet and a catalytic air outlet are provided at the bottom of the thermal storage catalytic furnace; the catalytic air inlet and the catalytic air outlet are connected with one open and two pipes, so the catalytic air inlet and the catalytic air outlet are connected. The catalytic air inlet includes: a first catalytic air inlet and a second catalytic air inlet, and the catalytic air outlet includes: a first catalytic air outlet and a second catalytic air outlet; between the first catalytic air outlet and the second catalytic air outlet A partition is installed between the catalytic air outlets, and the partition divides the space in the regenerative catalytic furnace into a first space and a second space; the first catalytic air inlet and the first catalytic air outlet are located in the first space. space, the second catalytic air inlet and the second catalytic air outlet are located in the second space; and the first catalytic air inlet and the second catalytic air outlet form a working group; the second catalytic air inlet A working group is formed with the first catalytic air outlet, and a first thermocouple is respectively provided in the first space and the second space.

Preferably, a dilution pneumatic valve is provided in the regenerative catalytic furnace, the dilution pneumatic valve is connected with an air pipeline, and the air pipeline connection includes an air inlet and an air outlet, and the air outlet is embedded in the regenerative catalytic furnace. , the dilution pneumatic valve is installed on the air inlet.

Preferably, it also includes: an activated carbon bed, a second thermocouple and a nitrogen protective gas valve are arranged in the activated carbon bed, a nitrogen pipeline is externally connected to the activated carbon bed, and the nitrogen protective gas valve is connected with the nitrogen pipeline.

Preferably, also include: filter equipment, chimney and spray tower; Described spray tower and described filter equipment communicate through the first air duct; Described filter equipment and described activated carbon bed communicate through the second air duct; The activated carbon bed communicates with the chimney through a third air duct, the activated carbon bed communicates with the regenerative catalytic furnace through a fourth air duct and a fifth air duct, and the activated carbon bed communicates with the regenerative catalytic furnace. A loop is formed between the furnaces; the regenerative catalytic furnace and the chimney are communicated through a sixth air duct; a catalytic fan, a supplementary cooling fan and a third thermocouple are sequentially installed on the fifth air duct; the chimney An exhaust air valve is arranged between the sixth air ducts.

Preferably, the fourth air duct is embedded in the catalytic air inlet to achieve communication, the fifth air duct is embedded in the catalytic air outlet to achieve communication, and a first catalytic air intake valve is installed on the first catalytic air inlet; A second catalytic air intake valve is installed on the second catalytic air inlet; a first catalytic air outlet valve is installed on the first catalytic air outlet; and a second catalytic air outlet valve is installed on the second catalytic air outlet .

Preferably, the heat storage catalytic furnace further comprises: a furnace body, a screen, a heat storage brick, a catalyst, a heating pipe and a partition plate; the heating pipe is a wave-shaped heating pipe; the screen is installed in the furnace body It is located above the catalytic air inlet and the catalytic air outlet; the furnace body contains the heat storage bricks and catalysts, and the heat storage bricks and catalysts are stacked on the screen from bottom to top. Above, there is a certain space between the heat storage brick and the catalyst; the heating pipe is arranged on the top of the furnace body; the partition plate extends from the bottom of the furnace body to above the catalyst but not It is not connected to the top of the regenerative catalytic furnace; the furnace body is wrapped with thermal insulation material.

Preferably, the activated carbon bed further comprises: a box body, an adsorption air inlet, an adsorption air outlet, a desorption air inlet and a desorption air outlet; the adsorption air inlet is opened on the top of the box body, and the adsorption air inlet is embedded in the There is a second air duct, the second air duct is connected with the filter device, and an adsorption air inlet valve is arranged between the second air duct and the filter device; the adsorption air outlet is opened at the bottom of the box body , the adsorption outlet is embedded with a third air duct; the third air duct is connected to the chimney, and an adsorption air valve and an adsorption fan are arranged between the third air duct and the chimney in sequence; The attached air outlet is located on the side below the box as shown, and a fourth air duct is embedded on the desorption air outlet, and the fourth air duct is connected with the catalytic air inlet of the regenerative catalytic furnace. A desorption air outlet valve is arranged between the air outlet and the third air duct; a desorption air inlet is arranged on the upper side of the box body, and a fifth air duct is embedded on the desorption air inlet. The fifth air duct is connected to the catalytic air outlet of the regenerative catalytic furnace, and a desorption air inlet air valve is arranged between the desorption air inlet and the fifth air duct.

Preferably, there are horizontal horizontal plates on the inner wall of the box, the horizontal plates divide the box into multiple spaces, and stretchable drawers are installed on the spaces; Activated carbon is arranged; the drawer is located just below the adsorption air inlet; the drawer is also provided with a handle; an opening is opened in the middle of the box body of the activated carbon bed, and the opening is facing the drawer; A unilateral door is installed on both sides of the opening, the four sides of the unilateral door are provided with sealing rubber strips, a lock is installed on both sides of the opening, and one side of the unilateral door is connected with the lock fixed.

Preferably, there are multiple activated carbon beds in the exhaust gas treatment system.

Preferably, the filtering device is a three-layer filtering structure; the three-layer filtering structure includes a layer of wire mesh demister, a layer of metal wire mesh primary filter and a layer of baffle plate demister.

Description of drawings

The accompanying drawings further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.

Fig. 1 is the schematic flow chart of waste gas treatment system;

Fig. 2 is the structural representation of filter equipment;

Figure 3 is a schematic structural diagram of a regenerative catalytic furnace;

4 is a schematic structural diagram of a regenerative catalytic furnace from another perspective;

5 is a schematic diagram of the structure of an activated carbon bed;

Figure 6 is a schematic diagram of the closed-door structure of the activated carbon bed;

Among them: spray tower 1, first air duct 11, filter equipment 2, second air duct 21, adsorption air inlet valve 211, wire mesh demister 22, wire mesh primary filter 23, baffle plate demisting 24, activated carbon bed 3, fourth air duct 31, desorption outlet air valve 311, fifth air duct 32, catalytic fan 321, supplementary cooling fan 322, third thermocouple 323, nitrogen pipeline 33, desorption air inlet air valve 321, nitrogen protective gas valve 331, second thermocouple 332, regenerative catalytic furnace 4, first catalytic air inlet 41, first catalytic air intake valve 411, second catalytic air inlet 42, second catalytic air intake valve 421, The first catalytic air outlet 43, the first catalytic air outlet valve 431, the second catalytic air outlet 44, the second catalytic air outlet valve 441, the partition plate 45, the first space 46, the first thermocouple 461, the second space 47, Seventh air duct 48, inner circulation pneumatic valve 481, air duct 49, dilution pneumatic valve 491, chimney 5, third air duct 51, adsorption outlet air valve 511, adsorption fan 52, sixth air duct 53, exhaust air valve 531 . Screen 61, heat storage brick 62, catalyst 63, thermal insulation material 64, heating pipe 65, box 7, adsorption air inlet 71, desorption air inlet 72, adsorption air outlet 73, desorption air outlet 74, horizontal plate 75, Drawer 76, handle 761, lock 77, unilateral door 78.

Detailed ways

The technical solutions of the present invention will be further described below with reference to Figures 1 to 6 and through specific embodiments.

An exhaust gas treatment system, comprising a regenerative catalytic furnace 4, a catalytic air inlet and a catalytic air outlet are opened at the bottom of the thermal storage catalytic furnace; the catalytic air inlet and the catalytic air outlet are connected with one open and two pipes, The catalytic air inlet includes: a first catalytic air inlet 41 and a second catalytic air inlet 42, and the catalytic air outlet includes: a first catalytic air outlet 43 and a second catalytic air outlet 44; A partition 45 is installed between the air outlet and the second catalytic air outlet, and the partition 45 divides the space in the regenerative catalytic furnace 4 into a first space 46 and a second space 47; the first catalytic air inlet 41 The first catalytic air outlet 43 and the first catalytic air outlet 43 are located in the first space 46, the second catalytic air inlet 42 and the second catalytic air outlet 44 are located in the second space 47; and the first catalytic air inlet 41 and the The second catalytic air outlet 44 is a working group; the second catalytic air inlet 42 and the first catalytic air outlet 43 are a working group, in the first space 46 and the second space 47 respectively A first thermocouple 461 is provided.

For example, in the desorption process of this example: the exhaust gas enters the first space 46 from the first catalytic air inlet 41, the exhaust gas will absorb the heat of the heat storage device in the first space 46 and use it for the next catalytic reaction, and then the exhaust gas will be catalyzed after It will rise to the top of the first space 46 and will be heated by the heating device at the top, then decompose and enter the second space 47 , and then be discharged from the second catalytic air outlet 44 in the second space 47 . Since the exhaust gas is heated at the top of the regenerative catalytic furnace 4, the temperature of the gas increases and is higher than the temperature in the second space 47, so the temperature of the gas will be absorbed by the heat storage device in the second space 47, After the first desorption process, the temperature of the first space 46 gradually decreases, which is insufficient to provide the temperature required for exhaust gas catalysis. At this time, it is necessary to change another group of working groups. The exhaust gas will enter the second space 47 from the second catalytic air inlet 42, and repeat the above-mentioned steps of desorption. The exhaust gas absorbs the heat of the heat storage device in the second space 47, and then the exhaust gas After passing through the top of the regenerative catalytic furnace 4, the exhaust gas is heated and purified by the heating device and discharged from the first catalytic air outlet 43 in the first space 46. Since the temperature of the heated exhaust gas is higher than the temperature of the first space 46, the first The heat storage device in the space 46 absorbs the heat of the exhaust gas, increasing the temperature. In this way, the utilization of thermal energy is improved, and there is no need to continuously heat the low-temperature space. At the same time, the first thermocouple 461 is added to the first space 46 and the second space 47, respectively, so that the temperature can be measured in real time, and according to the temperature change Change the air inlet and outlet.

Preferably, a dilution pneumatic valve 491 is provided in the regenerative catalytic furnace 4, and the dilution pneumatic valve 491 is connected to an air duct 49. The air duct 49 is connected to include an air inlet and an air outlet, and the air outlet is embedded in the air duct 49. In the regenerative catalytic furnace 4, the dilution pneumatic valve 491 is installed on the air inlet.

In order to prevent the temperature in the regenerative catalytic furnace 4 from being too high, the activity of the catalyst is reduced, and the optimal reaction value cannot be achieved. For this reason, an air pipe 49 is embedded in the regenerative catalytic furnace 4, and the air pipe 49 is connected by The dilution pneumatic valve 491 installed on the air duct 49 is controlled, and the dilution pneumatic valve 491 can open and close the air duct 49 and control the air circulation rate. When the temperature in the regenerative catalytic furnace 4 is too high, the staff needs to open the dilution pneumatic valve 491 to open the air duct 49 to introduce low-temperature outside air into the regenerative catalytic furnace 4 to reduce the temperature of the thermal storage catalytic furnace 4 . When it is found that the temperature of the regenerative catalytic furnace 4 is too low, the staff can control the dilution pneumatic valve 491 to reduce the air inflow into the air duct 49, or directly close the air duct 49 to ensure that the exhaust gas is ensured by human intervention in the temperature of the regenerative catalytic furnace 4 The reaction rate can be within the optimal range.

Preferably, it also includes an activated carbon bed 3, the activated carbon bed 3 is provided with a second thermocouple 332 and a nitrogen protective gas valve 331, the activated carbon bed is externally connected with a nitrogen pipeline 33, the nitrogen protective gas valve 331 and the nitrogen protective gas valve 331. Pipe 33 is connected.

In the process of desorption, usually because the temperature of the hot air blown in the regenerative catalytic furnace 4 is too high, the activated carbon in the activated carbon bed 3 spontaneously ignites. The spontaneous combustion of the activated carbon not only destroys the environmental protection equipment, but also affects the personnel life safety. For this purpose, a second thermocouple 332 for temperature measurement and a nitrogen line 33 for temperature reduction are added to the activated carbon bed 3 . The second thermocouple 332 is connected to the external display device, and the staff can observe the temperature in the activated carbon bed 3 through the display device. When the temperature is found to be too high, the nitrogen protective gas valve 331 needs to be opened. The nitrogen pipeline 33 Then it is communicated with the activated carbon bed 3, and nitrogen is charged into the activated carbon bed 3 to cool down. On the other hand, if the activated carbon bed 3 spontaneously ignites, a large amount of nitrogen is charged to isolate the oxygen in the air, and the effect of extinguishing the fire is achieved. When the temperature is lower than the temperature required for desorption, the nitrogen pipeline 33 is closed to stop cooling.

Preferably, it also includes: a filter device 2, a chimney 5 and a spray tower 1; the spray tower 1 and the filter device 2 communicate with each other through the first air duct 11; the filter device 2 and the activated carbon bed 3 Communication is achieved through the second air duct 21 ; the activated carbon bed 3 communicates with the chimney 5 through the third air duct 51 , and the activated carbon bed 3 and the regenerative catalytic furnace 4 pass through the fourth air duct 31 and the fifth air duct 51 . The air duct 32 is communicated and a loop is formed between the activated carbon bed 3 and the regenerative catalytic furnace 4; the regenerative catalytic furnace 4 and the chimney 5 are communicated through the sixth air duct 53; A catalytic fan 321 , a supplemental cooling fan 322 and a third thermocouple 323 are sequentially installed on the five air ducts 32 ;

In the adsorption process of exhaust gas, the exhaust gas must be pretreated first, that is, to clean up the solid particles, dust and moisture in the exhaust gas. These factors will affect the adsorption of exhaust gas. Therefore, before the exhaust gas adsorption, a spray tower 1 and a filter device 2 are added. The waste gas first passes through the spray tower 1. The water mist spraying in the spray tower 1 will reduce the solid particles and dust in the waste gas, and then the water vapor in the waste gas is absorbed by the filter device 2 to complete the pretreatment of the waste gas. The pretreated exhaust gas can enter the activated carbon bed 3 for adsorption treatment. Due to the adsorption characteristics of activated carbon, the activated carbon will adsorb VOCs in the exhaust gas to achieve the effect of purifying the exhaust gas. The purified exhaust gas can be directly discharged from the chimney 5. However, the adsorption of activated carbon has a certain limit and cannot be adsorbed indefinitely. When the adsorption value reaches saturation, the activated carbon bed 3 needs to exchange gas with the regenerative catalytic furnace 4. The regenerative catalytic furnace 4 blows hot air to the activated carbon bed 3. Due to the physical factor of the activated carbon, harmful substances VOCs will be removed from the activated carbon. Then, the harmful substances are blown to the regenerative catalytic furnace 4 for treatment.

Preferably, the fourth air duct 31 is embedded in the catalytic air inlet to achieve communication, the fifth air duct 32 is embedded in the catalytic air outlet to achieve communication, and the first catalytic air inlet 41 is installed with a first catalytic air inlet. Air valve 411; a second catalytic air intake valve 421 is installed on the second catalytic air inlet 42; a first catalytic air outlet valve 431 is installed on the first catalytic air outlet 43; the second catalytic air outlet 44 A second catalytic air outlet valve 441 is installed thereon.

When the first catalytic air intake valve 411 is opened, the communication between the first catalytic air inlet 41 and the fourth air passage 31 is achieved; when the second catalytic air intake valve 421 is opened, the second catalytic air intake 42 and the fourth air passage 31 are opened. The fourth air duct 31 is connected; the fourth air duct 31 is responsible for blowing harmful substances in the activated carbon bed 3 into the regenerative catalytic furnace 4; opening the first catalytic air outlet valve 431, the first The communication between the catalytic air outlet 43 and the fifth air passage 32 is achieved, and the second catalytic air outlet valve 441 is opened, and the second catalytic air outlet 44 is communicated with the fifth air passage 32; The air duct 32 is responsible for blowing the high temperature gas in the regenerative catalytic furnace 4 to the activated carbon bed 3 .

Preferably, the heat storage catalytic furnace 4 further comprises: a furnace body, a screen 61, a heat storage brick 62, a catalyst 63, a heating pipe 65 and a partition; the heating pipe 65 is a wave-shaped heating pipe 65; the screen The net 61 is installed in the furnace body and is located above the catalytic air inlet and the catalytic air outlet; the furnace body is provided with the heat storage brick 62 and the catalyst 63, and the heat storage brick 62 and the catalyst 63 The heat storage bricks 62 and the catalyst 63 are separated by a certain space; the heating pipes 65 are arranged on the top of the furnace body; the The partition plate 45 extends from the bottom of the furnace body to above the catalyst 63 but is not connected to the top of the regenerative catalytic furnace 4 ; the furnace body is wrapped with a thermal insulation material 64 .

In this example, for example, the exhaust gas enters the regenerative catalytic furnace 4 from the first space 46, and the exhaust gas first absorbs the heat in the regenerative brick 62 to increase its own temperature, but the exhaust gas here simply absorbs heat, because The heat of the heat storage bricks 62 cannot meet the reaction temperature of the exhaust gas, and the exhaust gas does not react here. After passing through the heat storage brick 62, it will pass through the catalyst 63, and a part of the exhaust gas will react with the catalyst 63 to generate CO2 and H2O. After passing through the catalyst 63, the exhaust gas will reach the top of the furnace body, and a heating pipe 65 is arranged on the top of the furnace body. The heating pipe 65 heats the exhaust gas to make the exhaust gas reach the temperature of spontaneous combustion. The concave-convex position in shape can increase the contact area between the exhaust gas and the heating pipe 65, so that the exhaust gas can be fully combusted and decomposed. Part of the exhaust gas is decomposed at the heating pipe, and the exhaust gas passes through the heating pipe 65 at the top and enters the second space 47, and the exhaust gas moves from top to bottom in the second space 47. After passing through the catalyst 63, most of the exhaust gas is here. oxidative catalytic decomposition; the amount of exhaust gas decomposition is the largest in the second space 47 . Then the exhaust gas falls to the heat storage brick 62, and the heat storage brick 62 can absorb the heat of the exhaust gas heated by the heating pipe 65, reduce the temperature of the gas, and the heat absorbed by the heat storage brick 62 can be used for the next replacement of the catalytic air inlet. Gas heating to maximize the utilization of heat. At the same time, in order to ensure that the temperature of the regenerative catalytic furnace 4 can be maintained at a temperature at which the exhaust gas can react. An insulating material is provided outside the furnace to wrap the regenerative catalytic furnace 4 so as to reduce external heat dissipation of the regenerative catalytic furnace 4 .

Preferably, the activated carbon bed 3 further comprises: a box body 7 , an adsorption air inlet 71 , an adsorption air outlet 72 , a desorption air inlet 73 and a desorption air outlet 74 ; the adsorption air inlet 71 is opened on the top of the box body 7 , the adsorption air inlet 71 is embedded in the second air duct 21, the second air duct 21 is connected to the filter device 2, and an adsorption air inlet valve is arranged between the second air duct 21 and the filter device 2 211; the adsorption air outlet 72 is opened at the bottom of the box 7, and a third air duct 51 is embedded in the adsorption air outlet 72; the third air duct 51 is connected to the chimney, and the third air duct Between 51 and the chimney 5, an adsorption air valve 511 and an adsorption fan 52 are arranged in sequence; Four air ducts 31, the fourth air duct 31 is connected to the catalytic air inlet of the regenerative catalytic furnace 4, and a desorption air outlet valve 331 is provided between the desorption air outlet 74 and the fourth air duct 31 ; The upper side of the box body 7 is provided with a desorption air inlet 73, and the desorption air inlet 73 is embedded with a fifth air duct 32, and the fifth air duct 32 and the regenerative catalytic furnace 4 A desorption air inlet valve 321 is provided between the desorption air inlet 73 and the fifth air duct 32 .

During the adsorption process, the pretreated exhaust gas can be blown to the adsorption air inlet 71 through the second air duct 21 . At this time, the adsorption air inlet valve 211 needs to be opened to make the gap between the activated carbon bed 3 and the filter device 2 . The communication is maintained, and the exhaust gas is then sent into the activated carbon bed 3. The exhaust gas purified by the activated carbon bed 3 reaches the emission standard. At this time, it is necessary to open the adsorption air valve 511 to maintain the communication between the activated carbon bed 3 and the chimney 5. The purified exhaust gas can be blown through the third air duct 51. into the chimney 5 and from the chimney 5 to the outside environment.

In the activated carbon bed 3, when the adsorption capacity of the activated carbon reaches the peak state, the activated carbon needs to be desorbed. At this time, the desorption air inlet valve 321, the first catalytic air outlet valve 431 or the second catalytic air outlet valve are opened. 441, so that the fifth air duct 32 is kept in a connected state, and the regenerative catalytic furnace 4 blows hot air into the activated carbon bed 3 through the fifth air duct 32, and the hot air is used for the desorption of activated carbon. After completion, open the desorption air outlet valve 311, the first catalytic air intake valve 411 or the second catalytic air intake air valve 421 to keep the fourth air passage 31 in a connected state, and the harmful substances desorbed from the activated carbon pass through the fourth air duct 31. The air duct 31 is blown into the regenerative catalytic furnace 4 for reaction treatment.

Preferably, the inner wall of the box body 7 is provided with a horizontal transverse plate 75, the transverse plate 75 divides the box body 7 into a plurality of spaces, and a stretchable drawer 76 is installed on the space; The drawer 76 is also provided with activated carbon; the drawer 76 is located directly below the adsorption air inlet 71; the drawer 76 is also provided with a handle 761; the middle of the box 7 of the activated carbon bed 3 has a Open, the opening is facing the drawer 76; a single-side door 78 is installed on both sides of the opening, the four sides of the single-side door 78 are provided with sealing rubber strips, and locks are installed on both sides of the opening Buckle 77, one side of the single-side door 78 is connected and fixed with the lock buckle 77.

In the existing waste gas treatment, the activated carbon bed 3 needs to be replaced after being used for a period of time because its adsorption properties decrease, but in the existing technology, the activated carbon bed 3 is a huge individual, and it is difficult to replace due to its large size It also increases, and it takes more time to replace when replacing. In order to solve this problem, a horizontal transverse plate 75 is arranged in the box body 7, a stretchable drawer 76 can be installed on the transverse plate 75, and activated carbon is placed in the drawer 76, and the current activated carbon bed is set as Drawer-type activated carbon is one by one. The drawer-type activated carbon is firstly smaller in volume. Second, because each drawer-type activated carbon is a separate working entity, in practice, not every drawer-type activated carbon has the adsorption capacity. The degree of decline is the same, and the staff can change the required activated carbon according to the adsorption capacity of each drawer-style activated carbon. Moreover, a handle 761 is installed on the drawer 76 , and the handle 761 is convenient for the staff to pull and pull the drawer 76 . The unilateral door 78 is used for the replacement of activated carbon. When the activated carbon loses its activity, the staff opens the unilateral door 78 and takes out the deactivated activated carbon from the box 7 . It reduces the difficulty of taking out the activated carbon and facilitates the daily operation of the staff. In order to prevent the exhaust gas from flowing out of the box 7 from the opening when processing the exhaust gas, a rubber belt is provided on the opening and the single-sided door 78, and the rubber belt can combine the edge of the opening with the edge of the door It is more compact, so that it is in a sealed state, and the exhaust gas will not flow out of the box 7 and pollute the environment.

Preferably, there are multiple activated carbon beds 3 in the exhaust gas treatment system.

During the desorption process, the activated carbon bed 3 closes the adsorption inlet air valve 211 and closes the connection between the filtering device 2 and the activated carbon bed 3 . In order to be able to carry out the adsorption treatment continuously, when the first activated carbon bed is desorbed, the user can turn on the second activated carbon bed for adsorption. Users can install the number of activated carbon beds 3 according to their own exhaust gas treatment capacity and the size of the regenerative catalytic furnace 4 .

Preferably, the filtering device 2 is a three-layer filtering structure; the three-layer filtering structure includes a layer of wire mesh demister 22, a layer of wire mesh primary filter 23 and a layer of baffle plate demister twenty four.

A three-layer filter structure is added to the filter equipment 4. The first layer of wire mesh demister 22 can absorb the moisture in the exhaust gas, and the second layer of wire mesh primary filter 23 can filter out the residual water after passing through the spray tower 1. For fine dust and suspended matter, the third-layer baffle demister 24 is to further absorb the moisture in the exhaust gas. Impurities such as moisture and suspended solids will affect the subsequent adsorption treatment. It is necessary to remove impurities such as moisture and suspended solids to the greatest extent possible.

Embodiment 1: Adsorption treatment, the first step is to open the spray tower 1, and pass the waste gas into the spray tower 1 in the open state. After the spray 1, the waste gas enters the filter equipment through the first air duct 11 In 2, the second step is to open the fan in the filter device 2 to purge the activated carbon bed 3; the time for purging is set to 5 minutes. The purging time can be determined according to the size of its own activated carbon bed. For example, the adsorption time of activated carbon in activated carbon bed 3 to the peak is 7 minutes, so it is necessary to turn off the fan 2 minutes in advance to stop purging to prevent the exhaust gas that is not completely purified from being discharged. polluted environment. The third step is to open the adsorption air inlet valve 211 and the adsorption air outlet valve 511, so that the second air duct 21 and the third air duct 51 are kept together, and the exhaust gas enters the activated carbon bed 3 through the second air duct 21, and the activated carbon will adsorb VOCs in exhaust gas. In the fourth step, the adsorption fan 52 is turned on, and the purified gas is pumped to the chimney 5 by the adsorption fan 52 and discharged out of the equipment to complete the adsorption treatment.

Example 2: Desorption treatment, the first step is to close the adsorption air inlet valve 211 and the adsorption air outlet valve 511 of the activated carbon bed 3 that needs to be desorbed. In the second step, simultaneously open the adsorption inlet air valve 211 and the adsorption air outlet valve 511 of the idle activated carbon bed in the bypass, and transfer the adsorption treatment to other activated carbon beds 3 . In the third step, simultaneously open the second catalytic air outlet valve 411 on the regenerative catalytic furnace 4, so that the fifth air passage 32 is in a connected state. The 4th step, open the catalytic blower 321 and the supplemental cooling blower 322 at the same time, the high temperature gas of the regenerative catalytic furnace 4 is swept into the activated carbon bed 3 that needs to be desorbed, and the purging time is set to be 10 minutes, and the purging time can be based The size of the squeaking activated carbon bed 3 is determined. During this process, the second thermocouple 332 will always remain in an open state to measure the temperature of the blowing high-temperature gas; if the gas temperature is too high, open the nitrogen protective gas valve 331 to transport nitrogen. into the activated carbon bed 3 to reduce the temperature in the activated carbon bed 3 to ensure that the temperature of the activated carbon bed 3 is within a safe range. In the fifth step, simultaneously open the desorption outlet air valve 311 that needs to desorb the activated carbon bed 3 and the first catalytic air inlet air valve 411 of the regenerative catalytic furnace 4, so that the fourth air duct 31 is kept in a connected state, and the activated carbon bed 3 is desorbed. The attached harmful substances are blown into the regenerative catalytic furnace 4. During this process, the first thermocouple 461 will measure the temperature of the first space 46 and the second space 47 in the regenerative catalytic furnace 4 in real time. A space 46, the gas outlet is the second space 47. Normally, due to the influence of catalysis, the temperature of the second space 47 at the outlet end will be higher than the temperature of the first space 46 at the inlet end. If the first thermocouple 461 checks When the temperature in the second space 47 is higher than the pre-warning temperature, the dilution pneumatic valve 491 needs to be opened, and the low-temperature outside air is sent into the second space 47 through the air pipe 49, so that the temperature of the second space 47 is lowered. When the coupler 461 detects that the temperature of the first space 46 is lower than the pre-warning temperature, the second space 47 is replaced with the intake end, and the first space 46 is replaced with the exhaust end. In the sixth step, open the inner circulation at the same time, and open the inner circulation pneumatic valve 481, so that the seventh air passage 48 is in a connected state. Set the internal circulation purge time to 7 minutes. The seventh step, after 7 minutes of opening the inner circulation, close the inner circulation pneumatic valve 481, open the air exhaust valve 531, and discharge a part of the purified gas out of the chimney through the sixth air duct 53, and the other part of the gas continues to be used for the activated carbon bed. 3 desorption.

It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The technical principle of the present invention has been described above with reference to the specific embodiments. These descriptions are only for explaining the principle of the present invention, and should not be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present invention without creative efforts, and these methods will all fall within the protection scope of the present invention.

Claims (10)

1. The waste gas treatment system is characterized by comprising a heat storage catalytic furnace, wherein a catalytic air inlet and a catalytic air outlet are formed in the bottom of the heat storage catalytic furnace, split pipelines are connected to the catalytic air inlet and the catalytic air outlet, the catalytic air inlet comprises a th catalytic air inlet and a second catalytic air inlet, the catalytic air outlet comprises a th catalytic air outlet and a second catalytic air outlet, a partition plate is arranged between the th catalytic air outlet and the second catalytic air outlet and divides the space in the heat storage catalytic furnace into a th space and a second space, the th catalytic air inlet and the th catalytic air outlet are positioned in a th space, the second catalytic air inlet and the second catalytic air outlet are positioned in the second space, the th catalytic air inlet and the second catalytic air outlet are working groups, the second catalytic air inlet and the th catalytic air outlet are working groups, and second thermocouples are respectively arranged in the th space and the second space.
2. 2. The waste gas treatment system according to claim 1, wherein a dilution pneumatic valve is provided in the regenerative thermal catalytic furnace, the dilution pneumatic valve is connected to an air pipe, the air pipe connection includes an air inlet and an air outlet, the air outlet is embedded in the regenerative thermal catalytic furnace, and the dilution pneumatic valve is installed on the air inlet.
3. 3. The waste gas treatment system of claim 1, further comprising an activated carbon bed, wherein a second thermocouple and a nitrogen protection valve are disposed in the activated carbon bed, the activated carbon bed is externally connected with a nitrogen pipeline, and the nitrogen protection valve is connected with the nitrogen pipeline.
4. 4. The waste gas treatment system according to claim 3, wherein the spray tower is in communication with the filter device through a th air duct, the filter device is in communication with the activated carbon bed through a second air duct, the activated carbon bed is in communication with the chimney through a third air duct, the activated carbon bed is in communication with the thermal storage catalytic furnace through a fourth air duct and a fifth air duct, a loop is formed between the activated carbon bed and the thermal storage catalytic furnace, the thermal storage catalytic furnace is in communication with the chimney through a sixth air duct, the catalytic fan, the supplemental cooling fan and the third thermocouple are sequentially installed on the fifth air duct, and an exhaust valve is arranged between the chimney and the sixth air duct.
5. 5. The waste gas treatment system of claim 4, wherein the fourth air duct is inserted into the catalytic air inlet to achieve communication, the fifth air duct is inserted into the catalytic air outlet to achieve communication, a catalytic air inlet valve is installed on the catalytic air inlet, a second catalytic air inlet valve is installed on the second catalytic air inlet, a catalytic air outlet valve is installed on the catalytic air outlet, and a second catalytic air outlet valve is installed on the second catalytic air outlet.
6. 6. The waste gas treatment system according to claim 1, further comprising a furnace body, a screen, heat storage bricks, a catalyst, a heating tube and a partition, wherein the heating tube is a wave-shaped heating tube, the screen is installed in the furnace body and located above the catalytic air inlet and the catalytic air outlet, the heat storage bricks and the catalyst are arranged in the furnace body, the heat storage bricks and the catalyst are sequentially stacked above the screen from bottom to top, a space is formed between the heat storage bricks and the catalyst, the heating tube is arranged at the top of the furnace body, the partition extends from the bottom of the furnace body to above the catalyst but is not connected with the top of the heat storage catalytic furnace, and a heat insulation material is wrapped outside the furnace body.
7. 7. The waste gas treatment system of claim 4, wherein the activated carbon bed further comprises a box, an adsorption air inlet, an adsorption air outlet, a desorption air inlet and a desorption air outlet, the adsorption air inlet is formed in the top of the box, a second air duct is embedded in the adsorption air inlet and connected with a filter device, an adsorption air inlet valve is arranged between the second air duct and the filter device, the adsorption air outlet is formed in the bottom of the box, a third air duct is embedded in the adsorption air outlet and connected with a chimney, an adsorption air outlet valve and an adsorption fan are sequentially arranged between the third air duct and the chimney, the desorption air outlet is located on the side below the box, a fourth air duct is embedded in the desorption air outlet and connected with the catalytic air inlet of the thermal storage catalytic furnace, a desorption air outlet valve is arranged between the desorption air outlet and the third air duct, a desorption air inlet is arranged on the side above the box, a fifth air duct is embedded in the desorption air inlet and connected with the catalytic air inlet of the thermal storage furnace, and a desorption air inlet valve is arranged between the desorption air inlet and the desorption air outlet of the thermal storage catalytic furnace.
8. 8. The waste gas treatment system of claim 7, wherein the box has transverse plates on its inner wall to divide the box into multiple spaces, stretchable drawers with activated carbon placed thereon are installed in the spaces, the drawers are located under the adsorption air inlet, the drawers are further provided with handles, openings are opened in the middle of the box of the activated carbon bed, the openings face the drawers, single-side openings are installed on both sides of the openings, the four sides of the single-side opening are provided with sealing rubber strips, the two sides of the opening are provided with latches, and the side of the single-side opening is connected and fixed to the latches.
9. 9. The exhaust gas treatment system according to claim 3, wherein there are multiple activated carbon beds in the exhaust gas treatment system.
10. 10. The waste gas treatment system of claim 4, wherein the filter device is a triple layer filter structure comprising layers of wire mesh mist eliminators, layers of wire mesh primary filters and layers of baffle mist eliminators.

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