RTO control method with high stability

Abstract

The invention relates to the technical field of heat accumulating type thermal oxidizers, in particular to a high-stability RTO control method. The air inlet valve and the air outlet valve are switched according to the time period given in the step Q1 to the step Q9 in the specification, the situation that all the air inlet valves and all the air outlet valves are closed does not exist, excessive pressure change of front-end production equipment cannot be caused, and a pipeline system and a main exhaust fan cannot be greatly influenced; the operation stability of the system is greatly improved, meanwhile, overtemperature of the heat accumulator can be avoided, and heat additionally provided by the burner can be effectively reduced. The reverse blowing valve is switched according to the step S1 to the step S3 in the specification, frequent starting and stopping of the reverse blowing fan and frequent opening and closing of the reverse blowing valve can be avoided, the service life of the reverse blowing fan and the service life of the reverse blowing valve are effectively prolonged, and the operation stability of the system is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of regenerative thermal oxidizers, and in particular to a high-stability RTO control method. Background Art

[0002] RTO is the abbreviation of Regenerative Thermal Oxidizer. RTO can be used to thermally incinerate organic waste gas VOCs. After combustion and oxidation, the organic waste gas can meet environmental protection requirements and be discharged into the atmosphere. Figure 1 To the attached Figure 3 The figure shows a three-body RTO commonly used in the prior art. The operation process of the three-body RTO in the prior art is as follows: Cycle 1: The first air inlet valve 7 corresponding to the first heat storage chamber 3 is opened, the second air outlet valve 11 corresponding to the second heat storage chamber 4 is opened, and the remaining air inlet valves and air outlet valves are closed. The valve status is as follows: Figure 2 As shown, after a duration of T, the cycle enters cycle 2. The organic waste gas passes through the first heat storage chamber 3 and the second heat storage chamber 4 in sequence. At the beginning of this cycle, the backflush pipe 16 is used to backflush the lower part of the third heat storage chamber 5 for a backflush time of t.

[0003] Cycle 2: The second air inlet valve 8 corresponding to the second heat storage chamber 4 is opened, and the third air outlet valve 12 corresponding to the third heat storage chamber 5 is opened. The remaining air inlet and outlet valves are closed. The organic waste gas passes through the second and third heat storage chambers 4 and 5 in sequence, and after a duration of T, it enters cycle 3. At the beginning of this cycle, backflushing is performed below the first heat storage chamber 3 for a backflushing time of t.

[0004] Cycle 3: The third air inlet valve 9 corresponding to the third heat storage chamber 5 is opened, and the first air outlet valve 10 corresponding to the first heat storage chamber 3 is opened. The remaining air inlet and outlet valves are closed. The organic waste gas passes through the third heat storage chamber 5 and the first heat storage chamber 3 in sequence, and after a duration of T, it enters cycle 1. At the beginning of this cycle, backflush is performed below the second heat storage chamber 4 for a backflush time of t.

[0005] The above three cycles are repeated to complete the continuous treatment of exhaust gas in the RTO.

[0006] In each cycle switching process, for example, in the valve switching process from cycle one to cycle two, if the first air inlet valve 7 and the second air outlet valve 11 are not closed in place, the second air inlet valve 8 and the third air outlet valve 12 are already opened, and the organic waste gas will not pass through the heat storage chamber and directly enter the air outlet channel 2 from the air inlet channel 1. Therefore, the prior art usually opens the second air inlet valve 8 and the third air outlet valve 12 after the first air inlet valve 7 and the second air outlet valve 11 are closed in place. However, at the moment when the second air inlet valve 8 and the third air outlet valve 12 are not opened after the first air inlet valve 7 and the second air outlet valve 11 are closed in place, all the air inlet valves and air outlet valves are closed, and at this time, the RTO will block the normal flow of gas in the pipeline system, causing the pressure of the front-end production equipment to change too much, the total exhaust fan in the RTO system to be overloaded, and other adverse effects.

[0007] In addition, the backflush gas introduced into the heat storage chamber is a normal temperature gas, and too much backflush gas blowing will affect the temperature in the heat storage chamber and the hearth, so in the prior art, the backflush time t is generally less than the switching time T of the air inlet valve and the air outlet valve, and therefore the backflush fan is frequently started and stopped, affecting the service life of the fan. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a high-stability RTO control method, which improves the switching sequence of the air inlet valve and the air outlet valve, avoids the phenomenon that the RTO blocks the normal flow of gas in the pipeline system in the traditional control method, reduces the pressure fluctuation of the front-end production equipment, improves the service life of the total exhaust fan, and also improves the action sequence of the backflush valve, improves the service life of the backflush fan, and greatly improves the use stability of the RTO.

[0009] To achieve the above object, the present application adopts the following technical scheme: A high-stability RTO control method, the RTO is provided with three heat storage chambers, which are a first heat storage chamber, a second heat storage chamber and a third heat storage chamber, and each heat storage chamber is correspondingly provided with an air inlet valve, an air outlet valve and a backflush pipeline below, the air inlet channel is communicated with the three heat storage chambers through the corresponding air inlet valve, and the air outlet channel is communicated with the three heat storage chambers through the corresponding air outlet valve, such as Figures 1 to 3The RTO shown is a three-body RTO commonly used in the prior art. A first air inlet valve and a first air outlet valve are correspondingly provided below the first heat storage chamber, a second air inlet valve and a second air outlet valve are correspondingly provided below the second heat storage chamber, and a third air inlet valve and a third air outlet valve are correspondingly provided below the third heat storage chamber. In each heat storage chamber, a backflush pipeline is provided below the heat storage body. The backflush pipeline is connected to the bottom of the heat storage bodies of the first heat storage chamber, the second heat storage chamber, and the third heat storage chamber respectively through the first backflush valve, the second backflush valve, and the third backflush valve. The organic waste gas to be treated is introduced into the RTO through the air inlet channel, and the air outlet channel of the RTO is connected to the exhaust chimney. The switching steps of the air inlet valves and air outlet valves corresponding to the three heat storage chambers are as follows: Step Q1: The first air inlet valve corresponding to the first heat storage chamber is opened, the second air outlet valve corresponding to the second heat storage chamber is opened, and the remaining air inlet valves and air outlet valves are closed. After time T1, step Q2 is entered.

[0010] Step Q2: The first air inlet valve and the second air outlet valve are opened, the third air outlet valve corresponding to the third heat storage chamber is opened, and the remaining air inlet valves and air outlet valves are closed. After time T2, step Q3 is entered.

[0011] Step Q3: The first air inlet valve and the third air outlet valve are opened, the second air inlet valve corresponding to the second heat storage chamber is opened, and the remaining air inlet valves and air outlet valves are closed. After time T3, step Q4 is entered.

[0012] Step Q4: The second air inlet valve and the third air outlet valve are opened, and the other air inlet valves and air outlet valves are closed. After time T4, the process proceeds to step Q5.

[0013] Step Q5: The second air inlet valve and the third air outlet valve are opened, the first air outlet valve corresponding to the first heat storage chamber is opened, and the remaining air inlet valves and air outlet valves are closed. After time T5, step Q6 is entered.

[0014] Step Q6: The second air inlet valve and the first air outlet valve are opened, the third air inlet valve corresponding to the third heat storage chamber is opened, and the remaining air inlet valves and air outlet valves are closed. After time T6, step Q7 is entered.

[0015] Step Q7: The third air inlet valve and the first air outlet valve are opened, and the other air inlet valves and air outlet valves are closed. After time T7, the process proceeds to step Q.

[0016] Step Q8: The third air inlet valve, the first air outlet valve, and the second air outlet valve are opened, and the remaining air inlet valves and air outlet valves are closed. After time T8, the process proceeds to step Q9.

[0017] Step Q9: The first air inlet valve, the third air inlet valve and the second air outlet valve are opened, and the remaining air inlet valves and air outlet valves are closed. After time T9, the process goes to step Q1.

[0018] The above nine steps are repeated to complete the continuous treatment of exhaust gas in the RTO.

[0019] Furthermore, assuming T is a time duration, in steps Q1 to Q9, if T1 = T, then T2 = 2T, T3 = 4T, T4 = T, T5 = 2T, T6 = 4T, T7 = T, T8 = 2T, and T9 = 4T. In practical applications, T is often taken as 30s, so T1 = 30s, T2 = 60s, T3 = 120s, T4 = 30s, T5 = 60s, T6 = 120s, T7 = 30s, T8 = 60s, and T9 = 120s.

[0020] Furthermore, one end of the back-blow pipeline away from the RTO is connected to the air outlet of the back-blower, and the back-blow pipeline is connected to the bottom of the heat storage body of the first heat storage chamber, the second heat storage chamber, and the third heat storage chamber respectively through the first back-blow valve, the second back-blow valve, and the third back-blow valve. The switching steps of the first back-blow valve, the second back-blow valve, and the third back-blow valve are as follows: Step S1 In step Q1 to step Q3, the third back-blow valve is opened, and the first back-blow valve and the second back-blow valve are closed.

[0021] Step S2 In steps Q4 to Q6, the first back-blow valve is opened, and the second back-blow valve and the third back-blow valve are closed.

[0022] Step S3 In steps Q7 to Q9, the second back-blow valve is opened, and the first back-blow valve and the third back-blow valve are closed.

[0023] The above three steps are repeated.

[0024] Furthermore, one end of the air intake passage away from the RTO is connected to an exhaust gas source via a main exhaust valve. A fresh air valve is also provided between the main exhaust valve and the RTO. One side of the fresh air valve is connected to the air intake passage and the other side is directly connected to the outside air. A furnace temperature sensor is provided in the furnace to measure the temperature of the gas in the furnace.

[0025] During normal operation of the RTO, the exhaust main valve is open and the fresh air valve is closed. The exhaust gas to be treated passes through the exhaust main valve and the air inlet channel into the RTO for treatment. If the concentration of the exhaust gas to be treated is too high, the heat released after combustion in the furnace will be large, causing the temperature in the furnace to exceed the set value. At this time, the fresh air valve will open to introduce fresh air into the exhaust gas to dilute the concentration of organic matter in the exhaust gas, thereby ensuring that the temperature in the furnace is lower than the set value.

[0026] Furthermore, a main exhaust fan is provided between the air outlet channel and the exhaust chimney. The exhaust gas source is connected to the air inlet of the main exhaust fan via a direct exhaust pipe. The direct exhaust pipe is provided with a direct exhaust valve. When the RTO is operating normally, the direct exhaust valve is closed. When the RTO fails and cannot operate normally, the main exhaust valve is closed and the direct exhaust valve is opened. The waste gas to be treated is discharged to the outside through the main exhaust fan and the exhaust chimney to ensure the normal operation of the front-end production equipment.

[0027] Compared with the prior art, the present invention has the following beneficial effects: The air inlet valve and the air outlet valve are switched according to steps Q1 to Q9. There is no situation where all the air inlet valves and the air outlet valves are closed. This will not cause excessive pressure changes in the front-end production equipment, nor will it have a major impact on the piping system and the main exhaust fan, greatly improving the stability of the system operation.

[0028] Steps Q1 to Q9 are switched according to a given time period, so that the heat absorbed by the heat storage body in each heat storage chamber during a valve switching cycle is equal to the heat released, which can not only avoid overheating of the heat storage body, but also effectively reduce the additional heat provided by the burner.

[0029] The back-blowing valve is switched according to steps S1 to S3, which can avoid frequent start and stop of the back-blowing blower and frequent opening and closing of the back-blowing valve, effectively prolonging the service life of the back-blowing blower and the back-blowing valve, and further improving the stability of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the front cross-sectional structure of the RTO in the present invention.

[0031] Figure 2 for Figure 1 Cross-sectional view along the AA axis.

[0032] Figure 3 for Figure 1 Cross-sectional view along the BB direction.

[0033] Figure 4 This is a schematic diagram of the pipeline and valve structure of the RTO in the present invention.

[0034] Figure 5 This is a diagram showing the switching sequence of the air inlet valve, air outlet valve, and back-blow valve in the present invention.

[0035] Figure 6 Schematic diagram of the position of each valve and the airflow direction in steps Q1 to Q3 of the present invention.

[0036] Figure 7 Schematic diagram of the position of each valve and the direction of airflow in steps Q4 to Q6 of the present invention.

[0037] Figure 8 Schematic diagram of the position of each valve and the airflow direction in steps Q7 to Q9 of the present invention.

[0038] In the figure: 1. Air inlet channel, 2. Air outlet channel, 3. First heat storage chamber, 4. Second heat storage chamber, 5. Third heat storage chamber, 6. Burner, 7. First air inlet valve, 8. Second air inlet valve, 9. Third air inlet valve, 10. First air outlet valve, 11. Second air outlet valve, 12. Third air outlet valve, 13. First back-blow valve, 14. Second back-blow valve, 15. Third back-blow valve, 16. Back-blow pipeline, 17. Main exhaust fan, 18. Main exhaust valve, 19. Fresh air valve, 20. Back-blow fan, 21. Direct exhaust valve, 22. Direct exhaust pipeline, 23. Exhaust chimney, 24. Furnace temperature sensor. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] A highly stable RTO control method, the RTO is provided with three heat storage chambers, namely the first heat storage chamber 3, the second heat storage chamber 4, and the third heat storage chamber 5. An air inlet valve, an air outlet valve, and a backflush pipe 16 are provided below each heat storage chamber. The air inlet channel 1 is connected to the three heat storage chambers through the corresponding air inlet valves, and the air outlet channel 2 is connected to the three heat storage chambers through the corresponding air outlet valves. Figures 1 to 3The RTO shown is a three-body RTO commonly used in the prior art. A first air inlet valve 7 and a first air outlet valve 10 are provided below the first heat storage chamber 3, a second air inlet valve 8 and a second air outlet valve 11 are provided below the second heat storage chamber 4, and a third air inlet valve 9 and a third air outlet valve 12 are provided below the third heat storage chamber 5. In each heat storage chamber, a backflush pipe 16 is provided below the heat storage body. The backflush pipe 16 is connected to the bottom of the heat storage bodies of the first heat storage chamber 3, the second heat storage chamber 4, and the third heat storage chamber 5 through the first backflush valve 13, the second backflush valve 14, and the third backflush valve 15 respectively. The organic waste gas to be treated is introduced into the RTO through the air inlet channel 1, and the air outlet channel 2 of the RTO is connected to the exhaust chimney 23. As shown Figure 5 As shown, the switching steps of the air inlet valve and air outlet valve corresponding to the three heat storage chambers are as follows: In step Q1, the first air inlet valve 7 corresponding to the first heat storage chamber 3 is opened, the second air outlet valve 11 corresponding to the second heat storage chamber 4 is opened, and the other air inlet valves and air outlet valves are closed. The exhaust gas to be treated enters the first heat storage chamber 3 through the first air inlet valve 7, absorbs the heat of the heat storage body in the first heat storage chamber 3, and its temperature is increased. It is burned and decomposed under the heating of the burner 6 in the furnace, releasing heat, and then enters the second heat storage chamber 4. The heat storage body in the second heat storage chamber 4 absorbs and stores the heat in the gas, and then the gas is discharged to the outlet channel 2 through the second air outlet valve 11. After time T1, step Q2 is entered.

[0041] In step Q2, the first air inlet valve 7 and the second air outlet valve 11 are opened, and the third air outlet valve 12 corresponding to the third heat storage chamber 5 is opened. The remaining air inlet and air outlet valves are closed. The exhaust gas to be treated enters the first heat storage chamber 3 through the first air inlet valve 7, absorbs heat from the heat storage element in the first heat storage chamber 3, and enters the furnace. Half of the exhaust gas enters the second heat storage chamber 4 and is discharged into the outlet passage 2 through the second air outlet valve 11. The other half of the exhaust gas enters the third heat storage chamber 5 and is discharged into the outlet passage 2 through the third air outlet valve 12. After time T2, the process proceeds to step Q3.

[0042] In step Q3, the first air inlet valve 7 and the third air outlet valve 12 are opened, the second air inlet valve 8 corresponding to the second heat storage chamber 4 is opened, and the remaining air inlet valves and air outlet valves are closed. Half of the exhaust gas to be treated passes through the first air inlet valve 7 and enters the first heat storage chamber 3, the furnace, and the third heat storage chamber 5 in sequence. The other half of the exhaust gas passes through the second air inlet valve 8 and enters the second heat storage chamber 4, the furnace, and the third heat storage chamber 5 in sequence. The two gases eventually merge in the outlet channel 2. After time T3, step Q4 is entered. In steps Q1 to Q3, the positions of the air inlet valves and the air outlet valves are as follows: Figure 6 shown.

[0043] In step Q4, the second air inlet valve 8 and the third air outlet valve 12 are opened, while the remaining air inlet and outlet valves are closed. The exhaust gas to be treated passes through the second air inlet valve 8, sequentially enters the second heat storage chamber 4, the furnace, and the third heat storage chamber 5, and is discharged into the air outlet passage 2 through the third air outlet valve 12. After time T4, the process proceeds to step Q5.

[0044] In step Q5, the second air inlet valve 8 and the third air outlet valve 12 are opened, the first air outlet valve 10 corresponding to the first heat storage chamber 3 is opened, and the remaining air inlet and air outlet valves are closed. The exhaust gas to be treated passes through the second air inlet valve 8 and enters the second heat storage chamber 4. After absorbing heat from the heat storage body in the second heat storage chamber 4 and entering the furnace, half of the gas enters the first heat storage chamber 3 and is discharged into the air outlet passage 2 through the first air outlet valve 10. The other half of the gas enters the third heat storage chamber 5 and is discharged into the air outlet passage 2 through the third air outlet valve 12. After time T5, the process proceeds to step Q6.

[0045] In step Q6, the second air inlet valve 8 and the first air outlet valve 10 are opened, the third air inlet valve 9 corresponding to the third heat storage chamber 5 is opened, and the remaining air inlet valves and air outlet valves are closed. Half of the exhaust gas to be treated passes through the second air inlet valve 8 and enters the second heat storage chamber 4, the furnace, and the first heat storage chamber 3 in sequence. The other half of the exhaust gas passes through the third air inlet valve 9 and enters the third heat storage chamber 5, the furnace, and the first heat storage chamber 3 in sequence. The two streams of gas finally merge in the outlet channel 2. After time T6, step Q7 is entered. In steps Q4 to Q6, the positions of each air inlet valve and each air outlet valve are as follows: Figure 7 shown.

[0046] In step Q7, the third air inlet valve 9 and the first air outlet valve 10 are opened, while the remaining air inlet and outlet valves are closed. The waste gas to be treated passes through the third air inlet valve 9, sequentially enters the third heat storage chamber 5, the furnace, and the first heat storage chamber 3, and is discharged through the first air outlet valve 10 into the air outlet passage 2. After time T7, the process proceeds to step Q8.

[0047] In step Q8, the third air inlet valve 9, the first air outlet valve 10, and the second air outlet valve 11 are opened, while the remaining air inlet and air outlet valves are closed. The waste gas to be treated enters the third heat storage chamber 5 through the third air inlet valve 9, absorbs heat from the heat storage element in the third heat storage chamber 5, and enters the furnace. Half of the gas enters the first heat storage chamber 3 and is discharged into the air outlet passage 2 through the first air outlet valve 10. The other half of the gas enters the second heat storage chamber 4 and is discharged into the air outlet passage 2 through the second air outlet valve 11. After time T8, the process proceeds to step Q9.

[0048] In step Q9, the first air inlet valve 7, the third air inlet valve 9, and the second air outlet valve 11 are opened, and the remaining air inlet valves and air outlet valves are closed. Half of the exhaust gas to be treated passes through the first air inlet valve 7 and enters the first heat storage chamber 3, the furnace, and the second heat storage chamber 4 in sequence. The other half of the exhaust gas passes through the third air inlet valve 9 and enters the third heat storage chamber 5, the furnace, and the second heat storage chamber 4 in sequence. The two streams of gas eventually merge in the outlet channel 2. After time T9, step Q1 is entered. In steps Q7 to Q9, the positions of the air inlet valves and the air outlet valves are as follows: Figure 8 shown. The above nine steps are repeated to complete the continuous treatment of exhaust gas in the RTO.

[0049] In the above nine steps, there is no situation where all the air inlet valves and air outlet valves are closed, which will not cause excessive pressure changes in the front-end production equipment, nor will it have a major impact on the pipeline system and the total exhaust fan 17, greatly improving the stability of the system operation.

[0050] Assuming T is a time duration, in steps Q1 to Q9, assume T1 = T, then T2 = 2T, T3 = 4T, T4 = T, T5 = 2T, T6 = 4T, T7 = T, T8 = 2T, and T9 = 4T. In practical applications, T is often assumed to be 30s, so T1 = 30s, T2 = 60s, T3 = 120s, T4 = 30s, T5 = 60s, T6 = 120s, T7 = 30s, T8 = 60s, and T9 = 120s.

[0051] Based on the switching characteristics of the air inlet and outlet valves, it can be seen that all the air inlet and outlet valves in steps Q1 to Q9 complete a valve switching cycle. Assuming that the exhaust gas volume processed by the RTO is M, in steps Q9, Q1, Q2, and Q3, the organic waste gas passes through the heat storage element of the first heat storage chamber 3 from bottom to top. Based on the operating principle of the RTO, it can be seen that during steps Q9 to Q3 during a valve switching cycle, the heat storage element of the first heat storage chamber 3 is in a heat release state. The data is as follows: The heat released in step Q9 is: 0.5M*4T=2MT.

[0052] The heat released in step Q1 is: M*T=MT.

[0053] The heat released in step Q2 is: M*2T=2MT.

[0054] The heat released in step Q3 is: 0.5M*4T=2MT.

[0055] In summary, in step Q9 to step Q3, the heat storage body of the first heat storage chamber 3 heats the exhaust gas, and the total volume of the exhaust gas processed is 7MT.

[0056] Similarly, it can be calculated that the heat storage body of the first heat storage chamber 3 in steps Q5 to Q8 absorbs and stores heat in the exhaust gas, and the total volume of exhaust gas processed is 7MT.

[0057] The total volume of exhaust gas heated by the heat storage body of the second heat storage chamber 4 in steps Q3 to Q6 is 7MT.

[0058] The total volume of exhaust gas that releases heat to the heat storage body in the second heat storage chamber 4 from step Q8 to step Q2 is 7MT.

[0059] The total volume of exhaust gas heated by the heat storage body of the third heat storage chamber 5 in steps Q6 to Q9 is 7MT.

[0060] The total volume of exhaust gas that releases heat to the heat storage body in the third heat storage chamber 5 in steps Q2 to Q5 is 7MT.

[0061] Therefore, taking T1=T, T2=2T, T3=4T, T4=T, T5=2T, T6=4T, T7=T, T8=2T, T9=4T, assuming that the heat storage body has an ideal heat exchange efficiency, under the condition that the specific heat capacity of the exhaust gas and the heat storage body is constant and the amount of heat storage body is sufficient, the heat absorbed by the heat storage body in each heat storage chamber during a valve switching cycle can be equal to the heat released.

[0062] If the heat absorbed by the heat storage element in each heat storage chamber during a valve switching cycle is greater than the heat released, the temperature of the heat storage element in that heat storage chamber will continue to rise until it overheats. Conversely, if the heat absorbed by the heat storage element in each heat storage chamber during a valve switching cycle is less than the heat released, the exhaust gas will not reach the preset temperature after passing through the heat storage element and entering the furnace, requiring the burner 6 in the furnace to provide additional heat, which wastes energy. Therefore, this valve switching method can minimize heat loss and further improve the stability of RTO operation.

[0063] like Figure 4 As shown, in actual application, the end of the back-blowing pipe 16 away from the RTO is connected to the air outlet of the back-blowing blower 20, and the back-blowing pipe 16 is connected to the bottom of the heat storage body of the first heat storage chamber 3, the second heat storage chamber 4, and the third heat storage chamber 5 through the first back-blowing valve 13, the second back-blowing valve 14, and the third back-blowing valve 15 respectively. Figure 5 As shown, the switching steps of the first back-blow valve 13, the second back-blow valve 14, and the third back-blow valve 15 are as follows: Step S1 In step Q1 to step Q3, the third back-blow valve 15 is opened, and the first back-blow valve 13 and the second back-blow valve 14 are closed. Back-blow air is blown into the lower part of the heat storage body of the third heat storage chamber 5 by using the back-blow air blower 20. In step Q1, the back-blow air can blow the untreated organic waste gas in the space below the heat storage body of the third heat storage chamber 5 back into the furnace for treatment. In step Q2 and step Q3, back-blow air is no longer needed. However, in order to avoid frequent starting and stopping of the back-blow air blower and frequent opening and closing of the back-blow valve, in step Q2 and step Q3, the third back-blow valve 15 remains open, and the back-blow air blower 20 remains in operation. However, the back-blow air provided by the back-blow air blower 20 will be directly discharged from the third air outlet valve 12 into the air outlet channel 2, and the back-blow air volume is small, which will not affect the entire exhaust gas treatment system.

[0064] Step S2: In steps Q4 through Q6, the first back-blow valve 13 is opened, and the second and third back-blow valves 14 and 15 are closed. Back-blow air is blown by the back-blow air blower 20 toward the lower portion of the heat storage element in the first heat storage chamber 3. This operation mechanism is similar to the back-blow mechanism for the lower portion of the heat storage element in the third heat storage chamber 5 in step S1.

[0065] Step S3: In steps Q7 through Q9, the second back-blow valve 14 is opened, and the first and third back-blow valves 13 and 15 are closed. Back-blow air blower 20 is used to blow back-blow air downwardly toward the heat storage element of the second heat storage chamber 4. This operating mechanism is similar to the back-blow mechanism for the heat storage element of the third heat storage chamber 5 in step S1.

[0066] The above three steps are repeated.

[0067] like Figure 4 As shown, in actual application, the end of the air intake channel 1 away from the RTO is connected to the exhaust gas source through the exhaust gas main valve 18. A fresh air valve 19 is also provided between the exhaust gas main valve 18 and the RTO. One side of the fresh air valve 19 is connected to the air intake channel 1 and the other side is directly connected to the outside air. A furnace temperature sensor 24 is provided in the furnace to measure the temperature of the gas in the furnace.

[0068] During normal operation of the RTO, the exhaust main valve 18 is open and the fresh air valve 19 is closed. The exhaust gas to be treated enters the RTO through the exhaust main valve 18 and the air inlet channel 1 for treatment. If the concentration of the exhaust gas to be treated is too high, the heat released after combustion in the furnace will be large, causing the temperature in the furnace to exceed the set value. At this time, the fresh air valve 19 will open to introduce fresh air into the exhaust gas to dilute the concentration of organic matter in the exhaust gas, thereby ensuring that the temperature in the furnace is lower than the set value.

[0069] like Figure 4As shown, in actual application, a main exhaust fan 17 is provided between the air outlet channel 2 and the exhaust chimney 23. The exhaust gas source is connected to the air inlet of the main exhaust fan 17 through a direct exhaust pipe 22. A direct exhaust valve 21 is provided on the direct exhaust pipe 22. When the RTO is operating normally, the direct exhaust valve 21 is closed. When the RTO fails to operate normally, the main exhaust valve 18 is closed and the direct exhaust valve 21 is opened. The exhaust gas to be treated is discharged to the outside through the main exhaust fan 17 and the exhaust chimney 23 to ensure the normal operation of the front-end production equipment.

[0070] The basic principles, main features, and advantages of the present invention are shown and described above. Directional designators such as front, back, left, right, end, and front end are intended for illustrative purposes only and are not limiting. Although embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, and substitutions may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling an RTO with high stability, wherein the RTO is provided with three heat storage chambers, namely a first heat storage chamber (3), a second heat storage chamber (4), and a third heat storage chamber (5), wherein an air inlet valve, an air outlet valve, and a backflush pipe (16) are provided below each heat storage chamber, wherein an air inlet channel (1) is connected to the three heat storage chambers through corresponding air inlet valves, and an air outlet channel (2) is connected to the three heat storage chambers through corresponding air outlet valves, and wherein: The organic waste gas to be treated is introduced into the RTO through the air inlet channel (1), and the air outlet channel (2) of the RTO is connected to the exhaust chimney (23). The switching steps of the air inlet valve and the air outlet valve corresponding to the three heat storage chambers are as follows: Step Q1: The first air inlet valve (7) corresponding to the first heat storage chamber (3) is opened, the second air outlet valve (11) corresponding to the second heat storage chamber (4) is opened, and the remaining air inlet valves and air outlet valves are closed. After time T1, step Q2 is entered; Step Q2: The first air inlet valve (7) and the second air outlet valve (11) are opened, the third air outlet valve (12) corresponding to the third heat storage chamber (5) is opened, and the remaining air inlet valves and air outlet valves are closed. After time T2, step Q3 is entered; Step Q3: The first air inlet valve (7) and the third air outlet valve (12) are opened, the second air inlet valve (8) corresponding to the second heat storage chamber (4) is opened, and the remaining air inlet valves and air outlet valves are closed. After time T3, step Q4 is entered; Step Q4: The second air inlet valve (8) and the third air outlet valve (12) are opened, and the remaining air inlet valves and air outlet valves are closed. After time T4, the process proceeds to step Q5; Step Q5: The second air inlet valve (8) and the third air outlet valve (12) are opened, the first air outlet valve (10) corresponding to the first heat storage chamber (3) is opened, and the remaining air inlet valves and air outlet valves are closed. After time T5, step Q6 is entered; Step Q6: The second air inlet valve (8) and the first air outlet valve (10) are opened, the third air inlet valve (9) corresponding to the third heat storage chamber (5) is opened, and the remaining air inlet valves and air outlet valves are closed. After time T6, step Q7 is entered; Step Q7: The third air inlet valve (9) and the first air outlet valve (10) are opened, and the remaining air inlet valves and air outlet valves are closed. After time T7, the process proceeds to step Q8. Step Q8: The third air inlet valve (9), the first air outlet valve (10), and the second air outlet valve (11) are opened, and the remaining air inlet valves and air outlet valves are closed. After time T8, step Q9 is entered; Step Q9: The first air inlet valve (7), the third air inlet valve (9) and the second air outlet valve (11) are opened, and the remaining air inlet valves and air outlet valves are closed. After time T9, the process proceeds to step Q1. The above nine steps are repeated to complete the continuous treatment of exhaust gas in the RTO.

2. The RTO control method with high stability according to claim 1, characterized in that: Assuming T is a time length, in steps Q1 to Q9, take T1=T, then T2=2T, T3=4T, T4=T, T5=2T, T6=4T, T7=T, T8=2T, and T9=4T.

3. The RTO control method with high stability according to claim 1, characterized in that: The back-blowing pipeline (16) is connected to the lower part of the heat storage body of the first heat storage chamber (3), the second heat storage chamber (4), and the third heat storage chamber (5) through the first back-blowing valve (13), the second back-blowing valve (14), and the third back-blowing valve (15), respectively. The switching steps of the first back-blowing valve (13), the second back-blowing valve (14), and the third back-blowing valve (15) are as follows: Step S1: In step Q1 to step Q3, the third back-blow valve (15) is opened, and the first back-blow valve (13) and the second back-blow valve (14) are closed; Step S2: In step Q4 to step Q6, the first back-blow valve (13) is opened, and the second back-blow valve (14) and the third back-blow valve (15) are closed; Step S3: In step Q7 to step Q9, the second back-blow valve (14) is opened, and the first back-blow valve (13) and the third back-blow valve (15) are closed; The above three steps are repeated.

4. The RTO control method with high stability according to claim 1, wherein: One end of the air inlet channel (1) away from the RTO is connected to the exhaust gas source through the exhaust gas main valve (18), and a fresh air valve (19) is further provided between the exhaust gas main valve (18) and the RTO. One side of the fresh air valve (19) is connected to the air inlet channel (1) and the other side thereof is directly connected to the outside air. A furnace temperature sensor (24) is provided in the furnace, and the furnace temperature sensor (24) is used to measure the temperature of the gas in the furnace.

5. The RTO control method with high stability according to claim 1, characterized in that: A main exhaust fan (17) is provided between the air outlet channel (2) and the exhaust chimney (23); the exhaust gas source is connected to the air inlet of the main exhaust fan (17) through a direct exhaust pipe (22); and a direct exhaust valve (21) is provided on the direct exhaust pipe (22).

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