Five-chamber regenerative combustion device and gas flow distribution method thereof

Abstract

The application discloses a five-chamber heat storage combustion device and an air flow distribution method thereof. The device comprises five heat storage chambers, a combustion chamber, a burner, an air inlet pipeline, an air outlet pipeline, a purge pipeline and a hot bypass pipeline with an over-temperature hot bypass valve, two combustion chambers are connected with the hot bypass pipeline through a heat extraction branch pipeline, and the two combustion chambers are the third combustion chamber and the fifth combustion chamber or the first combustion chamber and the third combustion chamber which are away from the burner. The air flow distribution method comprises five automatic reciprocating cycles, in each cycle, the air inlet heat storage chamber is adjacent to the air outlet heat storage chamber, the cycle time of each group is equal, and the air inlet, air outlet and purge of the heat storage chamber in each cycle are given. The application solves the problems of uneven air flow distribution, temperature fluctuation and excessive emission of the traditional equipment, improves the operation stability of the equipment, reduces the volume and production cost of the equipment, and meets the use requirements of large air volume industrial waste gas ultra-low emission.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment equipment technology, specifically to a five-chamber regenerative thermal combustion device, and further to an airflow distribution method for the five-chamber regenerative thermal combustion device. Background Technology

[0002] As the requirements for industrial waste gas (VOCs) treatment continue to increase, traditional two-chamber and three-chamber regenerative thermal oxidizers (RTOs) are gradually revealing their limitations under conditions such as large air volume, high purification standards, and continuous and stable operation.

[0003] Traditional two-chamber RTOs are simple in structure and low in cost, but during the switching process, untreated exhaust gas remaining in the regenerator chamber can easily be directly discharged with the purified flue gas, causing exhaust gas short-circuit leakage and making it difficult to meet strict emission limits. To solve this problem, the industry generally adopts three-chamber RTOs. By adding an independent purging process, the regenerator chamber about to be filled is backflushed during the switching stage, sending the residual exhaust gas back to the combustion chamber for reprocessing, significantly reducing the leakage rate and achieving a purification efficiency of over 98%, making it the mainstream application. However, when the treated air volume further increases (e.g., exceeding 50,000 Nm³), the situation becomes more challenging. 3 / h~100000Nm 3 When the temperature reaches 100°C / h, the defects of the three-chamber RTO gradually become apparent: the cross-sectional area of ​​each chamber is too large, the airflow distribution is uneven, and the local flow velocity deviation is obvious, resulting in a decrease in heat exchange efficiency; the airflow impact is large during reversal, the system pressure fluctuates violently, and the requirements for the stability of the fan, valve and pipeline are high; the lift valve has a high operating frequency and concentrated load, which makes it easy to wear and increase the failure rate; the purging air volume distribution is unreasonable, and there are still a few dead corners, making it difficult to achieve higher standards of ultra-low emissions.

[0004] To meet the demands of ultra-large air volume, ultra-high purification efficiency, low leakage, low pressure fluctuation, and long-term stable operation, existing technologies have developed into five-chamber regenerative combustion devices based on three-chamber RTOs.

[0005] The five-chamber RTO, by increasing the number of regenerator chambers, achieves multi-zone air intake, multi-zone air exhaust, independent purging, and step-by-step reversal, resulting in more uniform airflow, reduced valve operation frequency, more thorough purging, and more stable system operation. This allows it to maintain a purification efficiency of ≥99% and a thermal efficiency of ≥95% even under high airflow conditions, while improving equipment reliability and service life. It is particularly suitable for industries with extremely high emission and safety requirements, such as chemical, coating, pharmaceutical, and printing. Existing five-chamber RTO combustion chambers, such as... Figure 1 As shown, the overall process logic is as follows: Figure 2 As shown: Step 1: Perform the first cycle, low-temperature organic waste gas (40℃, 90000Nm³). 3 / h) is conveyed by the main process fan 4 to the intake pipe 20 through the exhaust gas main valve 2, and preheated by the heat storage body in the A heat storage chamber 23 and B heat storage chamber 24 (at this time, the heat storage body releases heat and the temperature decreases), and enters the A combustion chamber 32, AB combustion chamber connection 33, B combustion chamber 34, BC combustion chamber connection 35, C combustion chamber 36, CD combustion chamber connection 37, D combustion chamber 38, DE combustion chamber connection 39 and E combustion chamber 40.

[0006] Step 2: In the combustion chamber, the organic waste gas is heated to 800℃ by burner A30 and burner B31, and the organic waste gas in the waste gas is decomposed into CO2 and H2O at high temperature.

[0007] Step 3: The decomposed waste gas becomes purified high-temperature flue gas, which passes through heat storage chambers C 25 and D 26, storing heat in the heat storage media within these chambers. The waste gas temperature decreases by 90℃ (90000 Nm³). 3 / h), and finally discharged through exhaust pipe 21. At this time, the E regenerator 27 is purged by the main process fan 4.

[0008] Step 4: Maintain the first cycle for 60 seconds, then proceed to the second cycle. Intake air into heat storage chambers B 24 and C 25, exhaust air into heat storage chambers D 26 and E 27, and purge heat storage chamber A 23.

[0009] Step 5: Maintain the second cycle for 60 seconds, then proceed to the third cycle. Intake air into heat storage chambers C 25 and D 26, exhaust air into heat storage chambers E 27 and A 23, and purge heat storage chamber B 24.

[0010] Step 6: The third cycle is maintained for 60 seconds. The fourth cycle is then performed. Heat storage chambers D (26) and E (27) are inlet, heat storage chambers A (23) and B (24) are exhausted, and heat storage chamber C (25) is purged.

[0011] Step 7: The fourth cycle is maintained for 60 seconds. The fifth cycle is then performed. Heat storage chamber E 27 and heat storage chamber A 23 are inlet, heat storage chamber B 24 and heat storage chamber C 25 are exhaust, and heat storage chamber D 26 is purged.

[0012] Step 8: Hold the fifth loop for 60 seconds, then repeat the first loop.

[0013] During the first cycle of the RTO, the exhaust gases from regenerator A 23 and regenerator B 24 must be combined and passed through combustion chamber BC connection 35 after entering the combustion chamber. At this time, the air volume at this point is 90,000 Nm³. 3 / h, at this point the process logic has the following problems: If the cross-sectional area at the connection 35 of the BC combustion chamber is designed as 3355 mm × 1460 mm, it can meet the design standard of the exhaust gas residence time of 1 s, and the corresponding flue gas velocity is 21 m / s. An excessive velocity will cause a sharp fluctuation in the tail gas emission value of the equipment, ultimately resulting in the hourly average value of the exhaust gas emission ≥ 30 mg / m 3 , which cannot meet the environmental protection emission requirements.

[0014] If the cross-sectional area at the connection 35 of the BC combustion chamber is designed as 3355 mm × 2043 mm, the exhaust gas residence time can reach 1.3 s, and the velocity drops to 15 m / s. Although the problem of excessive velocity is solved, it will cause the volume of a single combustion chamber cavity to be too large, resulting in chaotic air flow and vortex phenomenon in the combustion chamber, leading to excessive temperature fluctuations inside the combustion chamber, indirectly causing the tail gas emission to exceed the standard, and the hourly average emission value is also ≥ 30 mg / m 3 , and at the same time, the too large cavity structure will greatly increase the mechanical manufacturing cost of the equipment, and the economy is poor.

[0015] In addition, there are obvious design defects in the equipment's hot bypass pipeline 29. The maximum designed ventilation volume of the super-temperature hot bypass valve 28 supporting the hot bypass pipeline 29 is 15% of the total treatment air volume, that is, 13500 Nm 3 / h. Under the operating conditions of the fifth cycle of the RTO, the E regenerator 27 and the A regenerator 23 intake air synchronously, and the intake air volume of a single chamber can reach 45000 Nm 3 / h. Since the hot bypass pipeline 29 is the closest to the E combustion chamber 40, most of the air flow in the E combustion chamber 40 will directly discharge through the hot bypass pipeline 29. Under this condition, the proportion of the hot bypass exhaust corresponding to the E combustion chamber 40 reaches 30%, seriously exceeding the maximum allowable exhaust volume of the hot bypass pipeline 29, which will cause the temperature condition of the E regenerator 27 to be out of balance and the temperature structure of the regenerator to be damaged, ultimately resulting in continuous excessive emission of the equipment's tail gas. Summary of the Invention

[0016] The first object of the present invention is to provide a five-chamber regenerative combustion device, which solves the problem of hot bypass flow deviation of traditional equipment.

[0017] Another object of the present invention is to provide an air flow distribution method for the five-chamber regenerative combustion device, which balances the air volume in each area and solves the problems of abnormal air flow velocity, vortex and hot bypass flow deviation.

[0018] The first technical solution adopted by the present invention is: a five-chamber regenerative combustion device, including five regenerators arranged in sequence, the top of each regenerator is connected with a combustion chamber, and the bottom is provided with an air intake interface, an exhaust interface and a purging interface; the combustion chambers are connected to form an integral combustion cavity, and a burner is installed in the integral combustion cavity; The air intake interfaces are all connected to the outlet of the air intake pipeline, and the inlet of the air intake pipeline is equipped with a main process fan; All exhaust ports are connected to the inlet of the exhaust pipe, and the outlet of the exhaust pipe is connected to the chimney. All purge ports are connected to the outlet of the purge pipe, and the inlet of the purge pipe is connected to the air inlet pipe located before the main process fan. It also includes a hot bypass pipe, one end of which is connected to the outlet of the exhaust pipe, and the other end is connected to the two combustion chambers respectively.

[0019] The first technical solution of this invention is further characterized by: At the inlet of the air intake duct, the exhaust gas manual valve, the exhaust gas main valve, the fresh air valve, and the main process fan are installed sequentially along the airflow direction.

[0020] Control valves are installed at each air intake port, exhaust port, and purge port.

[0021] The heat bypass pipeline is equipped with an over-temperature heat bypass valve.

[0022] The two combustion chambers connected by the heat bypass pipe are both far from the burner.

[0023] There are at least two burners, evenly distributed throughout the combustion chamber, and each burner is connected to natural gas and air via pipelines.

[0024] There are two burners, located in the second and fourth combustion chambers respectively; the heat bypass pipes are connected to the third and fifth combustion chambers, or the first and third combustion chambers, respectively, through heat extraction branch pipes.

[0025] Another technical solution adopted in this invention is: an airflow distribution method for a five-chamber regenerative combustion device, comprising five automatically reciprocating cycles consisting of intake-blowing-purging, with each cycle employing an adjacent configuration of the intake regenerative chamber and the exhaust regenerative chamber.

[0026] Another feature of the technical solution of the present invention is that: The five cycles are as follows: First cycle: Select the first and third heat storage chambers as intake heat storage chambers, select the second and fourth heat storage chambers as exhaust heat storage chambers, and use the remaining fifth heat storage chamber as a purge heat storage chamber; Second cycle: Select the first and fourth heat storage chambers as intake heat storage chambers, select the second and fifth heat storage chambers as exhaust heat storage chambers, and use the remaining third heat storage chamber as a purge heat storage chamber; Third cycle: Select the second and fourth heat storage chambers as intake heat storage chambers, select the third and fifth heat storage chambers as exhaust heat storage chambers, and use the remaining first heat storage chamber as a purge heat storage chamber; Fourth cycle: Select the second and fifth heat storage chambers as intake heat storage chambers, select the first and third heat storage chambers as exhaust heat storage chambers, and use the remaining fourth heat storage chamber as a purge heat storage chamber; Fifth cycle: Select the third and fifth heat storage chambers as intake heat storage chambers, select the first and fourth heat storage chambers as exhaust heat storage chambers, and use the remaining second heat storage chamber as purge heat storage chamber.

[0027] Each loop has the same duration.

[0028] The beneficial effects of this invention are: The device of this invention solves the problems of overload on one side of the original heat bypass pipe and excessive exhaust volume in the local combustion chamber by adding a third combustion chamber heat bypass heat extraction branch pipe and a fifth combustion chamber heat bypass heat extraction branch pipe. The two branch pipes share the bypass air volume equally, and the air volume of a single branch accounts for half of the total air volume. This avoids the temperature imbalance between the heat storage chamber and the combustion chamber, reduces the overall temperature fluctuation of the equipment, and improves the operational stability.

[0029] The airflow distribution method of this invention adopts an adjacent configuration for both intake and exhaust, avoiding the situation in the original scheme where the two intake chambers must converge at the combustion chamber connection before entering the exhaust chamber. By reducing the operating airflow of each connection section of the combustion chamber to half of its original value, and designing the connection section cross-section according to low airflow specifications, the flue gas velocity is controlled within 15 m / s, eliminating the emission fluctuation problem caused by high airflow. Simultaneously, no vortices are generated inside the cavity, ensuring stable combustion chamber operation and a stable hourly average exhaust gas emission of 30 mg / m³. 3 The following features meet ultra-low emission requirements. Furthermore, while maintaining the same airflow residence time and processing volume, the overall height of the equipment is reduced compared to traditional structures, lowering machining and casing manufacturing costs; the equipment structure is more compact, reducing the on-site installation footprint. Attached Figure Description

[0030] Figure 1 This is a structural diagram of existing technology; Figure 2 This is a switching logic diagram for existing technologies; Figure 3 This is a schematic diagram of the structure of the device of the present invention; Figure 4 This is a switching logic diagram of the method of the present invention.

[0031] In the diagram: 1. Exhaust gas duct manual valve; 2. Exhaust gas main valve; 3. Fresh air valve; 4. Main process fan; 5. A-chamber inlet valve; 6. A-chamber exhaust valve; 7. A-chamber purge valve; 8. B-chamber inlet valve; 9. B-chamber exhaust valve; 10. B-chamber purge valve; 11. C-chamber inlet valve; 12. C-chamber exhaust valve; 13. C-chamber purge valve; 14. D-chamber inlet valve; 15. D-chamber exhaust valve; 16. D-chamber purge valve; 17. E-chamber inlet valve; 18. E-chamber exhaust valve; 19. E-chamber purge valve; 20. Inlet duct; 21. Exhaust duct; 22. Purge duct; 23. 24. Regenerator A, 25. Regenerator B, 26. Regenerator C, 27. Regenerator D, 28. Regenerator E, 29. Overheat bypass valve, 30. Heat bypass pipe, 31. Burner A, 32. Burner B, 33. Combustion chamber A, 34. Combustion chamber B, 35. Combustion chamber BC, 36. Combustion chamber C, 37. Combustion chamber CD, 38. Combustion chamber D, 39. Combustion chamber DE, 40. Combustion chamber E, 41. Chimney, 42. Heat bypass branch pipe for chamber C, 43. Heat bypass branch pipe for chamber E. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] Example 1 The five-chamber regenerative combustion device provided in this embodiment, such as Figure 3 As shown, it includes five combustion chambers, five heat storage chambers, an intake pipe 20, an exhaust pipe 21, a purge pipe 22, and a heat bypass pipe 29.

[0034] Five regenerator chambers are arranged in sequence. Each regenerator chamber is connected to a combustion chamber at the top. The two adjacent combustion chambers are interconnected to form an integral combustion chamber. The burner is installed in the integral combustion chamber and is connected to natural gas and outside air through pipelines. Each regenerator chamber is equipped with an air inlet, an exhaust inlet, and a purging inlet at the bottom.

[0035] The inlet of the air intake duct 20 is sequentially equipped with an exhaust gas manual valve 1, an exhaust gas main valve 2, a fresh air valve 3, and a main process fan 4 along the air intake direction. The outlet is connected to the air intake interface at the bottom of each heat storage chamber.

[0036] One end of the purge pipe 22 is connected to the air inlet pipe 20, and the connection point is located before the main process fan 4; the other end is connected to the purge interface at the bottom of each heat storage chamber.

[0037] One end of the exhaust pipe 21 is connected to the exhaust port at the bottom of each heat storage chamber, and the other end is connected to the chimney 41.

[0038] One end of the hot bypass pipe 29 is connected to the exhaust pipe 21, with the connection point located between the fifth combustion chamber and the chimney 41; the other end is connected to each of the two combustion chambers. The hot bypass pipe 29 is equipped with an overheat hot bypass valve 28.

[0039] Example 2 The five-chamber regenerative combustion device provided in this embodiment, such as Figure 3 As shown, it includes five combustion chambers, five heat storage chambers, an intake pipe 20, an exhaust pipe 21, a purge pipe 22, and a heat bypass pipe 29.

[0040] The five regenerator chambers are designated as Regenerator A 23, Regenerator B 24, Regenerator C 25, Regenerator D 26, and Regenerator E 27. Regenerator A 23 is connected to Combustion Chamber A 32 at its top; Regenerator B 24 is connected to Combustion Chamber B 34 at its top; Regenerator C 25 is connected to Combustion Chamber C 36 at its top; Regenerator D 26 is connected to Combustion Chamber D 38 at its top; and Regenerator E 27 is connected to Combustion Chamber E 40 at its top. Combustion Chamber A 32 and Combustion Chamber B 34 are connected via Combustion Chamber AB Connection 33; Combustion Chamber B 34 and Combustion Chamber C 36 are connected via Combustion Chamber BC Connection 35; Combustion Chamber C 36 and Combustion Chamber D 38 are connected via Combustion Chamber CD Connection 37; and Combustion Chamber D 38 and Combustion Chamber E 40 are connected via Combustion Chamber DE Connection 39. All combustion chambers and connecting sections together form the integral combustion chamber. Burners A30 and B31 are installed inside the overall combustion chamber. The two burners are evenly distributed within the overall combustion chamber, with burner A30 located in combustion chamber B 34 and burner B31 located in combustion chamber D 38. Both burners A30 and B31 are externally connected to natural gas pipelines and outdoor air pipelines to provide a heat source for the high-temperature oxidation and decomposition of exhaust gas inside the chamber.

[0041] The bottom of heat storage chambers A (23), B (24), C (25), D (26), and E (27) are all provided with air inlet, air outlet, and purging port.

[0042] The inlet of the air intake duct 20 is sequentially equipped with an exhaust gas manual valve 1, an exhaust gas main valve 2, a fresh air valve 3, and a main process fan 4 along the air intake direction. The outlet is connected to the air intake interface at the bottom of each heat storage chamber.

[0043] One end of the purge pipe 22 is connected to the air inlet pipe 20, and the connection point is located before the main process fan 4; the other end is connected to the purge interface at the bottom of each heat storage chamber.

[0044] One end of the exhaust pipe 21 is connected to the exhaust port at the bottom of each heat storage chamber, and the other end is connected to the chimney 41.

[0045] One end of the heat bypass pipe 29 is connected to the exhaust pipe 21, with the connection point located between the E regenerator 27 and the chimney 41; the other end is connected to the E combustion chamber 40 and the C combustion chamber 36 respectively. The heat bypass pipe 29 is equipped with an over-temperature heat bypass valve 28.

[0046] Example 3 The five-chamber regenerative combustion device provided in this embodiment, such as Figure 3 As shown, it includes five combustion chambers, five heat storage chambers, an intake pipe 20, an exhaust pipe 21, a purge pipe 22, and a heat bypass pipe 29.

[0047] The five regenerator chambers are designated as Regenerator A 23, Regenerator B 24, Regenerator C 25, Regenerator D 26, and Regenerator E 27. Regenerator A 23 is connected to Combustion Chamber A 32 at its top; Regenerator B 24 is connected to Combustion Chamber B 34 at its top; Regenerator C 25 is connected to Combustion Chamber C 36 at its top; Regenerator D 26 is connected to Combustion Chamber D 38 at its top; and Regenerator E 27 is connected to Combustion Chamber E 40 at its top. Combustion Chamber A 32 and Combustion Chamber B 34 are connected via Combustion Chamber AB Connection 33; Combustion Chamber B 34 and Combustion Chamber C 36 are connected via Combustion Chamber BC Connection 35; Combustion Chamber C 36 and Combustion Chamber D 38 are connected via Combustion Chamber CD Connection 37; and Combustion Chamber D 38 and Combustion Chamber E 40 are connected via Combustion Chamber DE Connection 39. All combustion chambers and connecting sections together form the integral combustion chamber. Burners A30 and B31 are installed inside the overall combustion chamber. The two burners are evenly distributed within the overall combustion chamber, with burner A30 located in combustion chamber B 34 and burner B31 located in combustion chamber D 38. Both burners A30 and B31 are externally connected to natural gas pipelines and outdoor air pipelines to provide a heat source for the high-temperature oxidation and decomposition of exhaust gas inside the chamber.

[0048] The bottom of heat storage chamber A 23 has three interfaces, corresponding to the installation of chamber A inlet valve 5, chamber A exhaust valve 6, and chamber A purge valve 7, respectively; the bottom of heat storage chamber B 24 has three interfaces, corresponding to the installation of chamber B inlet valve 8, chamber B exhaust valve 9, and chamber B purge valve 10, respectively; the bottom of heat storage chamber C 25 has three interfaces, corresponding to the installation of chamber C inlet valve 11, chamber C exhaust valve 12, and chamber C purge valve 13, respectively; the bottom of heat storage chamber D 26 has three interfaces, corresponding to the installation of chamber D inlet valve 14, chamber D exhaust valve 15, and chamber D purge valve 16, respectively; the bottom of heat storage chamber E 27 has three interfaces, corresponding to the installation of chamber E inlet valve 17, chamber E exhaust valve 18, and chamber E purge valve 19, respectively.

[0049] The other ends of intake valves 5 (chamber A), 8 (chamber B), 11 (chamber C), 14 (chamber D), and 17 (chamber E) are all connected to intake pipe 20; the other ends of exhaust valves 6 (chamber A), 9 (chamber B), 12 (chamber C), 15 (chamber D), and 18 (chamber E) are all connected to exhaust pipe 21; the other ends of purge valves 7 (chamber A), 10 (chamber B), 13 (chamber C), 16 (chamber D), and 19 (chamber E) are all connected to purge pipe 22.

[0050] The inlet of the air intake duct 20 is sequentially equipped with an exhaust gas manual valve 1, an exhaust gas main valve 2, a fresh air valve 3, and a main process fan 4 along the air intake direction; the end of the exhaust duct 21 is connected to the chimney 41.

[0051] One end of the heat bypass pipe 29 is connected to the exhaust pipe 21, with the connection point located between the E regenerator 27 and the chimney 41; the other end is connected to the A combustion chamber 32 and the C combustion chamber 36 respectively. The heat bypass pipe 29 is equipped with an over-temperature heat bypass valve 28.

[0052] Example 4 The five-chamber regenerative combustion device provided in this embodiment, such as Figure 3 As shown, it includes five combustion chambers, five heat storage chambers, an intake pipe 20, an exhaust pipe 21, a purge pipe 22, and a heat bypass pipe 29.

[0053] The five regenerator chambers are designated as Regenerator A 23, Regenerator B 24, Regenerator C 25, Regenerator D 26, and Regenerator E 27. Regenerator A 23 is connected to Combustion Chamber A 32 at its top; Regenerator B 24 is connected to Combustion Chamber B 34 at its top; Regenerator C 25 is connected to Combustion Chamber C 36 at its top; Regenerator D 26 is connected to Combustion Chamber D 38 at its top; and Regenerator E 27 is connected to Combustion Chamber E 40 at its top. Combustion Chamber A 32 and Combustion Chamber B 34 are connected via Combustion Chamber AB Connection 33; Combustion Chamber B 34 and Combustion Chamber C 36 are connected via Combustion Chamber BC Connection 35; Combustion Chamber C 36 and Combustion Chamber D 38 are connected via Combustion Chamber CD Connection 37; and Combustion Chamber D 38 and Combustion Chamber E 40 are connected via Combustion Chamber DE Connection 39. All combustion chambers and connecting sections together form the integral combustion chamber. Burners A30 and B31 are installed inside the overall combustion chamber. The two burners are evenly distributed within the overall combustion chamber, with burner A30 located in combustion chamber B 34 and burner B31 located in combustion chamber D 38. Both burners A30 and B31 are externally connected to natural gas pipelines and outdoor air pipelines to provide a heat source for the high-temperature oxidation and decomposition of exhaust gas inside the chamber.

[0054] The bottom of heat storage chamber A 23 has three interfaces, corresponding to the installation of chamber A inlet valve 5, chamber A exhaust valve 6, and chamber A purge valve 7, respectively; the bottom of heat storage chamber B 24 has three interfaces, corresponding to the installation of chamber B inlet valve 8, chamber B exhaust valve 9, and chamber B purge valve 10, respectively; the bottom of heat storage chamber C 25 has three interfaces, corresponding to the installation of chamber C inlet valve 11, chamber C exhaust valve 12, and chamber C purge valve 13, respectively; the bottom of heat storage chamber D 26 has three interfaces, corresponding to the installation of chamber D inlet valve 14, chamber D exhaust valve 15, and chamber D purge valve 16, respectively; the bottom of heat storage chamber E 27 has three interfaces, corresponding to the installation of chamber E inlet valve 17, chamber E exhaust valve 18, and chamber E purge valve 19, respectively.

[0055] The other ends of intake valves 5 (chamber A), 8 (chamber B), 11 (chamber C), 14 (chamber D), and 17 (chamber E) are all connected to intake pipe 20; the other ends of exhaust valves 6 (chamber A), 9 (chamber B), 12 (chamber C), 15 (chamber D), and 18 (chamber E) are all connected to exhaust pipe 21; the other ends of purge valves 7 (chamber A), 10 (chamber B), 13 (chamber C), 16 (chamber D), and 19 (chamber E) are all connected to purge pipe 22.

[0056] The inlet of the air intake duct 20 is sequentially equipped with an exhaust gas manual valve 1, an exhaust gas main valve 2, a fresh air valve 3, and a main process fan 4 along the air intake direction; the end of the exhaust duct 21 is connected to the chimney 41.

[0057] This embodiment also includes a C-chamber thermal bypass heat extraction branch pipe 42 and an E-chamber thermal bypass heat extraction branch pipe 43. One end of the C-chamber thermal bypass heat extraction branch pipe 42 is connected to the C combustion chamber 36, and the other end is connected to the thermal bypass pipe 29. One end of the E-chamber thermal bypass heat extraction branch pipe 43 is connected to the E combustion chamber 40, and the other end is connected to the thermal bypass pipe 29. An overheating thermal bypass valve 28 is installed on the thermal bypass pipe 29, and the thermal bypass pipe 29 is finally connected to the exhaust pipe 21 at the front end of the chimney 41. By adding the C-chamber thermal bypass heat extraction branch pipe and the E-chamber thermal bypass heat extraction branch pipe, the design air volume of the two branch pipes is 7.5% of the total design air volume, i.e., 6750 Nm³. 3 / h, ultimately summing up to 13500Nm 3 / h, ensuring that excessive heat loss does not occur when exhausting from the hot bypass pipe in a single combustion chamber, and guaranteeing that emission data meets the requirement of ≤30mg / m³. 3 And the temperature operation is stable.

[0058] Example 5 This embodiment also provides an airflow distribution method for the above-mentioned five-chamber regenerative combustion device, such as... Figure 4 As shown, it includes five automatic reciprocating cycles, each of which uses an adjacent configuration of the intake heat storage chamber and the exhaust heat storage chamber.

[0059] Example 6 This embodiment also provides an airflow distribution method for the above-mentioned five-chamber regenerative combustion device, such as... Figure 4 As shown, the device operates in a cycle, consisting of five cycles, each lasting 60 seconds. After completing all five cycles, it automatically repeats. The specific process is as follows: The first cycle: Low-temperature organic waste gas at 40℃ and a flow rate of 90,000 Nm³ / h flows sequentially through the waste gas pipeline manual valve 1 and the main waste gas valve 2, and is then transported to the inlet pipeline 20 by the main process fan 4; the inlet valve 5 of chamber A and the inlet valve 11 of chamber C are opened respectively, and the organic waste gas enters the heat storage chamber A 23 and the heat storage chamber C 25. The heat storage body inside the heat storage chamber preheats the waste gas and then releases heat to cool it down; the preheated waste gas enters the integral combustion chamber; The organic waste gas in the overall combustion chamber is heated to 800°C by burners A30 and B31, and the organic pollutants in the waste gas are oxidized and decomposed into CO2 and H2O at high temperature. With exhaust valves 9 in chamber B and 15 in chamber D opened, the decomposed high-temperature purified flue gas flows through heat storage chambers 24 in chamber B and 26 in chamber D. The heat in the high-temperature purified flue gas is absorbed and stored by the heat storage bodies inside heat storage chambers 24 in chamber B and 26 in chamber D, reducing the temperature of the high-temperature purified flue gas to 90℃, while maintaining the total flow rate at 90,000 Nm³. 3 / h, is delivered to the chimney 41 via exhaust pipe 21 for external discharge. During this stage, the E chamber purge valve 19 is opened simultaneously, and the airflow output by the main process fan 4 purges the E heat storage chamber 27 through the purge pipe 22.

[0060] Second cycle: Switch valve status and open intake valve 5 in chamber A and intake valve 14 in chamber D respectively. Organic waste gas enters heat storage chamber 23 in chamber A and heat storage chamber 26 in chamber D through intake pipe 20, and after preheating, it is sent into the overall combustion chamber. The high-temperature purified flue gas after combustion and decomposition enters heat storage chamber 24 in chamber B and heat storage chamber 27 through exhaust valve 9 in chamber B and exhaust valve 18 in chamber E for heat exchange, and is then discharged through exhaust pipe 21 and chimney 41. At the same time, purge valve 13 in chamber C is opened, and heat storage chamber 25 in chamber C is purged through purge pipe 22.

[0061] Third cycle: Switch valve status, open the intake valve 8 of chamber B and the intake valve 14 of chamber D respectively, and the organic waste gas enters the heat storage chamber 24 of chamber B and the heat storage chamber 26 of chamber D through the intake pipe 20 to complete the preheating and then send it into the overall combustion chamber; the high-temperature purified flue gas after combustion and decomposition enters the heat storage chamber 25 of chamber C and the heat storage chamber 27 of chamber E through the exhaust valve 12 of chamber C and the exhaust valve 18 of chamber E for heat exchange, and then is discharged through the exhaust pipe 21 and the chimney 41; at the same time, the purging valve 7 of chamber A is opened, and the heat storage chamber 23 of chamber A is purged through the purging pipe 22.

[0062] Fourth cycle: Switch valve status, open the intake valve 8 of chamber B and the intake valve 17 of chamber E, and the organic waste gas enters the heat storage chamber 24 of chamber B and the heat storage chamber 27 of chamber E through the intake pipe 20 to complete the preheating and then enters the overall combustion chamber; the high-temperature purified flue gas after combustion and decomposition enters the heat storage chamber 23 of chamber A and the heat storage chamber 25 of chamber C through the exhaust valve 6 of chamber A and the exhaust valve 12 of chamber C for heat exchange, and then is discharged through the exhaust pipe 21 and the chimney 41; at the same time, the purge valve 16 of chamber D is opened, and the heat storage chamber 26 of chamber D is purged through the purge pipe 22.

[0063] Fifth cycle: Switch valve status, open C chamber inlet valve 11 and E chamber inlet valve 17, organic waste gas enters C regenerator 25 and E regenerator 27 through inlet pipe 20 to complete preheating and then is sent into combustion chamber; the purified flue gas after combustion decomposition enters A regenerator 23 and D regenerator 26 through A chamber exhaust valve 6 and D chamber exhaust valve 15 for heat exchange, and is then discharged through exhaust pipe 21 and chimney 41; at the same time, open B chamber purge valve 10, and purge B regenerator 24 through purge pipe 22.

[0064] All of the above cycles adopt a compartment-paired intake operation mode, which is equivalent to a single 90000Nm 3 The five-chamber regenerative combustion unit with a capacity of / h was split into two 45000Nm units. 3 The unit operates at a capacity of / h, and the connection sections between combustion chambers A, B, C, D, and E are all designed to withstand 45000 Nm of torque. 3 The design features an airflow rate of / h, a cross-sectional dimension of 3355mm × 1360mm, a waste gas residence time of 1s, and a flue gas velocity below 15m / s. This not only avoids the original structure's 90000Nm... 3 The large air volume flowing through the narrow cross-section causes wind velocities as high as 21 m / s and drastic fluctuations in emission values; at the same time, it eliminates the need to enlarge the cavity cross-section, avoiding airflow turbulence generated in a large-volume cavity, thereby avoiding temperature disturbances and emission exceedances caused by turbulence. The hourly average value of the equipment's exhaust gas emissions is consistently ≤30 mg / m³. 3 Since the horizontal cross-sectional area of ​​the RTO remains unchanged, but its height is reduced by 100mm compared to the original design, the mechanical manufacturing cost is also reduced by 5%.

Claims

1. A five-chamber regenerative combustion device, characterized in that, It includes five regenerators arranged in sequence. Each regenerator is connected to a combustion chamber at the top and has an air inlet, an exhaust, and a purging port at the bottom. The combustion chambers are connected to form an integral combustion chamber, and a burner is installed in the integral combustion chamber. All air intake interfaces are connected to the outlet of the air intake pipe, and the main process fan is installed at the inlet of the air intake pipe. All exhaust ports are connected to the inlet of the exhaust pipe, and the outlet of the exhaust pipe is connected to the chimney. All purge ports are connected to the outlet of the purge pipe, and the inlet of the purge pipe is connected to the air inlet pipe located before the main process fan. It also includes a hot bypass pipe, one end of which is connected to the outlet of the exhaust pipe, and the other end is connected to the two combustion chambers respectively.

2. The five-chamber regenerative combustion device according to claim 1, characterized in that, At the inlet of the air intake pipe, the exhaust gas manual valve, the exhaust gas main valve, the fresh air valve, and the main process fan are installed sequentially along the airflow direction.

3. The five-chamber regenerative combustion device according to claim 1, characterized in that, Each of the aforementioned air intake port, exhaust port, and purge port is equipped with a control valve.

4. The five-chamber regenerative combustion device according to claim 1, characterized in that, The heat bypass pipeline is equipped with an over-temperature heat bypass valve.

5. The five-chamber regenerative combustion device according to claim 1, characterized in that, The two combustion chambers connected by the heat bypass pipe are both far from the burner.

6. The five-chamber regenerative combustion device according to claim 1, characterized in that, There are at least two burners, evenly distributed within the overall combustion chamber, and each burner is connected to natural gas and air via pipelines.

7. The five-chamber regenerative combustion device according to claim 1, characterized in that, There are two burners, located in the second combustion chamber and the fourth combustion chamber respectively; the heat bypass pipes are connected to the third combustion chamber and the fifth combustion chamber, or the first combustion chamber and the third combustion chamber respectively, through heat extraction branch pipes.

8. The airflow distribution method of the five-chamber regenerative combustion device according to any one of claims 1-7, characterized in that, It includes five automatically reciprocating cycles consisting of intake-blowing-purging, with each cycle employing an adjacent configuration of the intake heat storage chamber and the exhaust heat storage chamber.

9. The airflow distribution method of the five-chamber regenerative combustion device according to claim 8, characterized in that, The five cycles are as follows: First cycle: Select the first and third heat storage chambers as intake heat storage chambers, select the second and fourth heat storage chambers as exhaust heat storage chambers, and use the remaining fifth heat storage chamber as a purge heat storage chamber; Second cycle: Select the first and fourth heat storage chambers as intake heat storage chambers, select the second and fifth heat storage chambers as exhaust heat storage chambers, and use the remaining third heat storage chamber as a purge heat storage chamber; Third cycle: Select the second and fourth heat storage chambers as intake heat storage chambers, select the third and fifth heat storage chambers as exhaust heat storage chambers, and use the remaining first heat storage chamber as a purge heat storage chamber; Fourth cycle: Select the second and fifth heat storage chambers as intake heat storage chambers, select the first and third heat storage chambers as exhaust heat storage chambers, and use the remaining fourth heat storage chamber as a purge heat storage chamber; Fifth cycle: Select the third and fifth heat storage chambers as intake heat storage chambers, select the first and fourth heat storage chambers as exhaust heat storage chambers, and use the remaining second heat storage chamber as purge heat storage chamber.

10. The airflow distribution method of the five-chamber regenerative combustion device according to claim 8, characterized in that, Each cycle has the same duration.

Images