RTO gas purification system

Abstract

The utility model discloses an RTO gas purification system, and relates to the technical field of gas purification, and the RTO gas purification system comprises a filter, an adsorption bed, RTP equipment, a fresh air device and an exhaust device. The filter is used for filtering particulate matters in the to-be-purified gas; the adsorption bed is provided with an adsorption valve and a desorption valve, the adsorption valve comprises an adsorption inlet and an adsorption outlet and allows to-be-purified gas to enter and exit the adsorption bed, the adsorption inlet is connected with the filter, and the desorption valve comprises a desorption inlet and a desorption outlet and allows desorbed gas to enter and exit the adsorption bed; the RTO equipment is connected with the desorption outlet and is used for purifying desorption gas; the fresh air device is connected with the desorption inlet and is used for generating desorption gas; the exhaust device is respectively connected with the adsorption outlet and the RTO equipment. After multiple times of adsorption and purification, a large amount of adsorption substances accumulated in the adsorption bed are desorbed into desorption gas by using the desorption gas generated by the fresh air device, and then enter RTO equipment for high-temperature oxidation and decomposition, so that the operation of replacing an adsorption medium is avoided.

Description

Technical Field

[0001] This application relates to the technical field of gas purification, and in particular to an RTO gas purification system. Background Art

[0002] For the treatment of medium- and low-concentration malodorous gases, traditional treatment methods include adsorption method, absorption method, plasma method, biological method, incineration method, etc. The adsorption method has a relatively high purification efficiency and can treat complex-component malodorous gases. Its disadvantage is that the replacement frequency and cost of the adsorbent are relatively high. The absorption method is suitable for malodorous gases with good water solubility and has a good purification effect, but it will cause the problem of secondary pollution of wastewater. The plasma method has the advantages of small equipment footprint and low investment cost, but its disadvantage is low purification efficiency and it cannot meet the emission requirements. The biological method is widely used in the treatment of malodorous gases due to its high removal rate, easy operation and low energy consumption, and is commonly used to treat medium- and high-concentration malodorous gases. However, the disadvantage of large floor area limits the popularization and application of the biological method. The incineration method has a high purification efficiency, but the operating cost is high for medium- and low-concentration malodorous gases.

[0003] The utility model patent publication number CN218530351U discloses an integrated device for the adsorption, catalytic purification and regeneration of organic gases, including an exhaust gas treatment device, an activated carbon adsorption device, and a catalytic purification system. The exhaust gas treatment device includes a draft fan, a valve assembly, an exhaust gas transportation pipeline, and a flame arrester and dust remover. The exhaust gas transportation pipeline is sequentially connected to the activated carbon adsorption device, the exhaust gas treatment device and the draft fan. The valve assembly and the flame arrester and dust remover are arranged on the exhaust gas transportation pipeline; the activated carbon adsorption device includes an adsorption box, a storage box, and a pushing mechanism. The pushing mechanism includes a telescopic rod and a movable mounting member; the catalytic purification system includes a heating chamber and a catalytic chamber. During the process of the equipment main body treating exhaust gas, the metering valve can judge that the activated carbon adsorption layer needs to be replaced according to the industrial exhaust gas adsorption flow threshold value of the activated carbon adsorption layer. Through the mechanical push of the pushing mechanism, the activated carbon adsorption layer is automatically replaced to ensure the adsorption effect of the activated carbon adsorption layer on the exhaust gas, so that the entire malodorous gas treatment process can proceed smoothly. However, frequently replacing the activated carbon adsorption layer is not only troublesome to operate, but also requires a high operating cost. Summary of the Invention

[0004] In order to solve the problem that the adsorption layer of the gas purification equipment needs to be frequently replaced, this application provides an RTO gas purification system.

[0005] An RTO gas purification system provided by this application adopts the following technical solutions:

[0006] An RTO gas purification system includes:

[0007] A filter for filtering particulate matter in the gas to be purified;

[0008] An adsorption bed, having an adsorption valve and a desorption valve. The adsorption valve includes an adsorption inlet and an adsorption outlet for the gas to be purified to enter and exit the adsorption bed. The adsorption inlet is connected to a filter. The desorption valve includes a desorption inlet and a desorption outlet for the desorption gas to enter and exit the adsorption bed;

[0009] An RTO device, connected to the desorption outlet, for purifying the desorption gas;

[0010] A fresh air device, connected to the desorption inlet, for generating the desorption gas;

[0011] An exhaust device, respectively connected to the adsorption outlet and the RTO device.

[0012] By adopting the above technical solution, the adsorption bed is used to ensure the purification efficiency of the gas purification system. After the gas to be purified removes particulate matter through the filter, it enters the adsorption bed through the adsorption inlet. After removing the adsorption substances of the gas to be purified in the adsorption bed, it enters the exhaust device from the adsorption outlet and is thus discharged from the purification system. After multiple adsorption purifications, a large amount of adsorption substances accumulated in the adsorption bed are desorbed into the desorption gas in the adsorption bed by using the desorption gas generated by the fresh air device.

[0013] A Regenerative Thermal Oxidizer (RTO) is a device used to treat waste gas containing organic compounds. Its working principle is to oxidize and decompose harmful gases into harmless gases at high temperature. After the desorption gas absorbs the adsorption substances, it enters the RTO device. After high-temperature oxidation, it is introduced into the exhaust device and discharged from the purification system. By using the desorption gas and the RTO device to desorb the adsorption bed, the adsorption bed can be recycled, eliminating the operation of replacing the adsorption bed, improving the operation efficiency and reducing the operation cost at the same time.

[0014] Optionally, the purification system further includes an adsorption fan and an RTO fan. The adsorption fan is respectively connected to the adsorption outlet and the exhaust device, and the RTO fan is respectively connected to the desorption outlet and the RTO device.

[0015] By adopting the above technical solution, the adsorption fan can push the gas to be purified to flow through the filter and the adsorption bed from the outside and enter the exhaust device, and the flow rate of the gas to be purified in the adsorption bed can be controlled by the adsorption fan, thereby adjusting the adsorption effect. The RTO fan can push the desorption gas to flow through the fresh air device, the adsorption bed and the RTO device, thereby completing the desorption treatment of the adsorption bed by the desorption gas and enabling the adsorption bed to be recycled.

[0016] Optionally, the RTO device includes a lift valve, a regenerative chamber and an incineration chamber. The lift valve is respectively connected to the RTO fan and the exhaust device. The regenerative chamber is arranged between the lift valve and the incineration chamber, and the incineration chamber is for the desorption gas to burn and be purified.

[0017] By adopting the above technical solution, the lift valve is both the gas inlet and outlet of the RTO device. By providing a regenerator between the incineration chambers of the lift valve, the heat of the gas flowing through the regenerator after incineration is stored, and the gas entering the incineration chamber is preheated, thereby improving the energy utilization rate of the RTO device.

[0018] Optionally, the purification system further includes a flame arrester, which is arranged between the RTO fan and the desorption outlet and is used to prevent the flame from spreading to the adsorption bed.

[0019] By adopting the above technical solution, when the desorbed gas is oxidized and decomposed in the incineration chamber, oxygen needs to be introduced, so that a flame will be generated during the incineration process in the incineration chamber. The flame will spread along the desorbed gas to the outside of the RTO device. By providing a flame arrester, the spreading flame is intercepted at the flame arrester, avoiding damage to the equipment outside the RTO device caused by the flame.

[0020] Optionally, the purification system further includes a purging device, which is used to purge the residual gas in the regenerator. The purging device includes a purging blower and a purging valve, and the purging valve is respectively connected to the purging blower and the lift valve.

[0021] By adopting the above technical solution, the purging blower can blow air into the regenerator through the lift valve, so that the unincinerated gas remaining in the regenerator, so that the harmful adsorbed substances in the desorbed gas can be oxidized and decomposed at high temperature by the RTO device.

[0022] Optionally, the purification system further includes a heat exchanger, which is respectively connected to the RTO device, the fresh air device, the desorption inlet and the exhaust device and is used to heat the desorbed gas by using the gas generated by the RTO device.

[0023] By adopting the above technical solution, the heat exchanger can use the waste heat of the gas generated by the RTO device to heat the desorbed gas generated by the fresh air device. Since the optimal desorption temperature of the desorbed gas is much lower than the temperature of the gas after incineration in the RTO device and the required gas volume is small, an additional gas discharge method is still required. After the gas heat exchange, it enters the exhaust device and is discharged from the purification system. By increasing the temperature of the desorbed gas, the desorption effect of the desorbed gas can be improved, so that the adsorbed substances in the adsorption bed can be fully desorbed into the desorbed gas, thereby improving the purification effect of the purification system.

[0024] Optionally, the heat exchanger is connected with a heat extraction control valve, which is used to control the flow rate of the gas flowing through the heat exchanger.

[0025] By adopting the above technical solution, the heat extraction control valve controls the temperature of the desorbed gas by controlling the flow rate of the gas flowing through the heat exchanger, so that the desorbed gas can be at a better desorption temperature and the desorption effect is improved.

[0026] Optionally, the RTO device further includes a temperature relief valve, which is connected to the incineration chamber and the exhaust device.

[0027] By adopting the above technical solution, when the temperature in the incineration chamber is too high, it is difficult to quickly discharge the gas through the lift valve to reduce the temperature. Therefore, by connecting a temperature relief valve, the gas in the incineration chamber can be quickly discharged, thus avoiding the situation where the temperature is too high to be controlled.

[0028] To sum up, the present application includes at least one of the following beneficial technical effects:

[0029] 1. After multiple adsorption purifications, a large amount of adsorbed substances accumulated in the adsorption bed are desorbed into the desorption gas in the adsorption bed by using the desorption gas generated by the fresh air device; after the desorption gas absorbs the adsorbed substances, it enters the RTO device, and after high-temperature oxidation, it is introduced into the exhaust device and discharged from the purification system. By using the desorption gas and the RTO device to desorb the adsorption bed, the adsorption bed can be recycled, eliminating the operation of replacing the adsorption bed, improving the operation efficiency, and reducing the operation cost at the same time;

[0030] 2. The lift valve is both the gas inlet and the outlet of the RTO device. By providing a regenerative heat storage chamber between the lift valve and the incineration chamber, the heat of the gas flowing through the regenerative heat storage chamber after incineration is stored, and the gas entering the incineration chamber is preheated, thereby improving the energy utilization rate of the RTO device;

[0031] 3. The heat exchanger can utilize the waste heat of the gas generated by the RTO device. The desorption gas generated by the fresh air device can improve the desorption effect of the desorption gas by increasing the temperature of the desorption gas, so that the adsorbed substances in the adsorption bed can be fully desorbed into the desorption gas, thereby improving the purification effect of the purification system. Description of the Drawings

[0032] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0033] Figure 2 is Figure 1 the partial enlarged schematic diagram of part A in

[0034] Reference numerals: 1, filter; 2, adsorption bed; 21, adsorption valve; 21a, adsorption inlet; 21b, adsorption outlet; 22, desorption valve; 22a, desorption inlet; 22b, desorption outlet; 3, RTO device; 31, lift valve; 32, regenerative heat storage chamber; 33, incineration chamber; 34, temperature relief valve; 35, electric heater; 4, fresh air device; 5, exhaust device; 61, adsorption fan; 62, RTO fan; 7, flame arrester; 8, purging device; 81, purging blower; 82, purging valve; 9, heat exchanger; 91, heat extraction control valve. Detailed Embodiments

[0035] The following further elaborates on this application in conjunction with the accompanying drawings.

[0036] An RTO gas purification system, referring to Figure 1 and Figure 2 , includes a filter 1, an adsorption bed 2, an RTO device, a fresh air device 4, an exhaust device 5, an adsorption fan 61, an RTO fan 62, a flame arrester 7, a purging device 8, and a heat exchanger 9. The filter 1 is connected to the adsorption bed 2. The adsorption bed 2 is provided with an adsorption medium. The filter 1 includes three-stage filtration of primary effect, intermediate effect, and high effect to filter particulate matter in the malodorous gas. After the waste gas passes through the filter 1, the size of the particulate matter in the waste gas can be controlled below 5 μm. Thus, during subsequent adsorption treatment, the particulate matter in the waste gas is not likely to block the adsorption pores of the adsorption medium, which is conducive to the adsorption medium maintaining a high adsorption effect for a long time.

[0037] The adsorption medium in the adsorption bed 2 is honeycomb zeolite. The honeycomb zeolite is in a block structure, and the common model is 100×100×100 mm. The honeycomb zeolite is not likely to catch fire spontaneously under high-temperature desorption conditions, and its safety is greatly improved compared with traditional activated carbon adsorbents. Moreover, the desorption temperature is higher, reaching above 200 °C, and the desorption is more thorough. Under the condition of ensuring the stable compliance of the system, the service life of the adsorption medium is longer, and the operating cost of the system is lower.

[0038] Referring to Figure 1 and Figure 2 , the number of adsorption beds 2 is three. Each adsorption bed 2 is provided with an adsorption valve 21 and a desorption valve 22. The adsorption valve 21 includes an adsorption inlet 21a and an adsorption outlet 21b. The adsorption inlet 21a is connected to the filter 1, and the adsorption outlet is connected to the adsorption fan 61. The adsorption fan 61 is connected to the exhaust device 5, so as to flow the gas to be purified from the filter 1 through the adsorption bed 2 and discharge it from the exhaust device 5. The desorption valve 22 includes a desorption inlet 22a and a desorption outlet 22b. The desorption inlet 22a is connected to the fresh air device 4, and the desorption outlet 22b is connected to the flame arrester 7. The flame arrester 7 is connected to the RTO fan 62 and then connected to the RTO device 3. Thus, after the desorption gas generated by the fresh air device 4 is desorbed in the adsorption bed 2, it passes through the flame arrester 7 and enters the RTO device 3 under the promotion of the RTO fan 62. The desorption gas undergoes high-temperature oxidation decomposition in the RTO device 3. The flame arrester 7 can block the flame generated during the high-temperature oxidation decomposition process and prevent the flame from entering the adsorption bed 2, ensuring the normal operation of the purification system.

[0039] Referring to Figure 1, the RTO device 3 includes a lift valve 31, a regenerative chamber 32, and an incineration chamber 33. The lift valve 31 is connected to the RTO fan 62 and the exhaust device 5 respectively. The desorption gas is discharged into and out of the RTO device 3 from the lift valve 31. The number of the lift valve 31 and the regenerative chamber 32 is three each. Each lift valve 31 is connected to a regenerative chamber 32, and the three regenerative chambers 32 are all connected to the same incineration chamber 33. The incineration chamber 33 has an electric heater 35, which is used to heat the desorption gas in the incineration chamber 33 to thermally decompose the harmful substances in the desorption gas. When the desorption gas enters and exits the incineration chamber 33, it will pass through the regenerative chamber 32. The regenerative chamber 32 can store part of the heat of the desorption gas discharged from the incineration chamber 33 and is used to preheat the desorption gas entering the incineration chamber 33. The discharged desorption gas passes through the lift valve 31 and is introduced into the exhaust device 5 to be discharged from the purification system. The RTO device 3 also includes a temperature relief valve 34, which is connected to the incineration chamber 33 and the exhaust device 5. The temperature relief valve 34 can quickly discharge the gas from the incineration chamber 33 to reduce the temperature in the incineration chamber 33.

[0040] Refer to Figure 1 , the purging device 8 is connected to the lift valve 31. The purging device 8 includes a purge blower 81 and a purge valve 82. The purge blower 81 can purge gas into the regenerative chamber 32 through the lift valve 31 to make the desorption gas remaining in the regenerative chamber 32 enter the incineration chamber 33 for high-temperature decomposition. The number of the purge valves 82 is three, which are respectively arranged between the purge blower 81 and the three lift valves 31 to control the on-off of the purging gas.

[0041] Refer to Figure 1 , the heat exchanger 9 is respectively connected to the incineration chamber 33, the exhaust device 5, the fresh air device 4, and the desorption inlet 22a, so that the desorption gas exchanges heat with the gas discharged from the incineration chamber 33 before entering the adsorption bed 2, so that the desorption gas has a certain temperature before entering the adsorption bed 2, which can improve the adsorption medium in the adsorption bed 2 to reach the desorption temperature, so that the adsorbed substances in the adsorption medium are fully desorbed, thereby ensuring the adsorption performance of the adsorption medium and improving the purification effect of the purification system.

[0042] The implementation principle of the embodiment of this application is as follows: After the gas to be purified enters the filter 1 to remove larger particulate matters, it enters the adsorption bed 2 through the adsorption inlet 21a. After adsorbing and removing harmful substances, it is discharged from the adsorption outlet 21b to the exhaust device 5 and discharged from the purification system. After multiple adsorptions, a certain amount of harmful substances accumulates in the adsorption bed 2. At this time, the entry of the gas to be purified is stopped, and the desorption gas starts to be generated from the fresh air device 4. After being heated by the heat exchanger 9, the desorption gas enters the adsorption bed 2. After the temperature of the adsorption medium rises, the harmful substances are desorbed from the adsorption medium into the desorption gas. After the desorption gas is transported to the RTO device 3, the harmful substances in the desorption gas are oxidized and decomposed at high temperature, so as to realize the regeneration of the adsorption medium while efficiently decomposing the harmful substances, improving the purification efficiency and the purification effect.

[0043] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Among them, the same components are represented by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. An RTO gas purification system, characterized in that, Comprising: A filter (1) for filtering particulate matter in the gas to be purified; An adsorption bed (2) having an adsorption valve (21) and a desorption valve (22), the adsorption valve (21) including an adsorption inlet (21a) and an adsorption outlet (21b) for the gas to be purified to enter and exit the adsorption bed (2), the adsorption inlet (21a) being connected to the filter (1), and the desorption valve (22) including a desorption inlet (22a) and a desorption outlet (22b) for desorption gas to enter and exit the adsorption bed (2); An RTO device (3) connected to the desorption outlet (22b) for purifying the desorption gas; A fresh air device (4) connected to the desorption inlet (22a) for generating desorption gas; An exhaust device (5) connected to the adsorption outlet and the RTO device (3) respectively; Further comprising an adsorption fan (61) and an RTO fan (62), the adsorption fan (61) being connected to the adsorption outlet (21b) and the exhaust device (5) respectively, and the RTO fan (62) being connected to the desorption outlet (22b) and the RTO device (3) respectively; The RTO device (3) includes a lift valve (31), a regenerator (32) and an incineration chamber (33), the lift valve (31) being connected to the RTO fan (62) and the exhaust device (5) respectively, the regenerator (32) being disposed between the lift valve (31) and the incineration chamber (33), and the incineration chamber (33) for burning and purifying the desorption gas; Further comprising a flame arrester (7) disposed between the RTO fan (62) and the desorption outlet (22b) for preventing the spread of flame to the adsorption bed (2); Further comprising a heat exchanger (9) connected to the RTO device (3), the fresh air device (4), the desorption inlet (22a) and the exhaust device (5) respectively for heating the desorption gas by using the gas generated by the RTO device (3); 2. The RTO gas purification system according to claim 1, characterized in that, Further comprising a purging device (8) for purging the residual gas in the regenerator (32), the purging device (8) including a purging blower (81) and a purging valve (82), the purging valve (82) being connected to the purging blower (81) and the lift valve (31) respectively; 3. An RTO gas purification system according to claim 1, wherein The heat exchanger (9) is connected with a heat extraction control valve (91) for controlling the flow rate of the gas flowing through the heat exchanger (9); 4. An RTO gas purification system according to claim 1, characterized in that, The RTO device (3) further includes a temperature reduction valve (34) connected to the incineration chamber (33) and the exhaust device (5).

Images