Heat accumulating type incineration system and reverse combustion process control method

Abstract

According to the heat accumulating type incineration system and the reverse burning procedure control method, all sensors are arranged in a heat accumulating type incineration device, the working state of the heat accumulating type incineration system can be mastered in real time, adjustment can be rapidly made through a control device, and therefore efficient and stable operation of the heat accumulating type incineration system can be protected, and the fire catching and explosion risks are reduced. Due to the arrangement of an air mixing box of the reverse combustion device, high-temperature flue gas in the hearth and tail gas at the bottom of the furnace can be better mixed; and the opening degrees of a high-temperature bypass valve and an air return valve of the heat storage incineration device are controlled by detecting the temperature of a reverse blowing pipeline, and the mixing temperature of high-temperature flue gas of a hearth and tail gas at the bottom of the furnace is accurately controlled. And the gas is led to the heat storage chamber through the purging pipeline for reverse combustion, so that the overall switching is fast.

Description

Technical Field

[0001] The invention relates to the field of waste gas treatment, and in particular to a heat storage incineration system and a back-burning process control method. Background Art

[0002] Regenerative Thermal Oxidizer (RTO) performs well in purification efficiency and is widely used in the treatment of printing and packaging waste gas, coating waste gas and pharmaceutical waste gas. Its purification efficiency exceeds 98%, and its heat utilization efficiency is as high as 95% or more, which significantly reduces energy consumption. With the continuous improvement of environmental protection requirements, RTO technology plays an increasingly important role in the field of waste gas treatment, helping to reduce atmospheric pollutant emissions and improve air quality. It is an indispensable pollution control equipment in many industrial fields. In order to effectively treat waste gas containing tar-like high-boiling point substances, traditional RTO devices usually use a variety of means to remove large particles and liquid tar in the waste gas, such as using a cyclone dust collector to remove particles with a particle size greater than 10 microns, water washing or dry filtration equipment equipped with G4+F5 filter grade fiber cotton filter cartridges. In addition, during the incineration process, the waste gas is introduced into the combustion chamber and stays in a high temperature environment of 760 to 820 degrees Celsius for more than 1 second to completely oxidize and decompose organic matter to generate carbon dioxide, nitrogen oxides, sulfur dioxide and water. In order to monitor and control the combustion state in the furnace, the RTO furnace is usually equipped with multiple temperature probes and pressure sensors to ensure the safety and stability of the incineration process. However, after long-term operation of the existing RTO device, the high-boiling-point substances accumulated in the heat storage body are prone to cause the deposition of tar and other substances. When high-temperature back-burning is carried out, there is a risk of instantaneous gasification of tar-like substances, causing deflagration and furnace overheating, which poses a hidden danger to the safe operation of the equipment. It is urgent to take effective measures to eliminate this safety hazard and ensure that the RTO system can operate continuously and stably. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides a thermal storage incineration system that can better control the temperature inside the thermal storage body and reduce the risk of fire and explosion.

[0004] A regenerative incineration system, comprising a control device and a pretreatment device, a regenerative oxidation device, a back-burning device and a smoke exhaust device controlled by the control device, wherein the pretreatment device comprises a cyclone dust collector for removing particulate matter in the exhaust gas and a cartridge deoiler for removing liquid tar in the exhaust gas; the regenerative oxidation device comprises at least three regenerative chambers, a combustion chamber, an air intake pipe, a purge pipe and an exhaust pipe, and the exhaust gas treated by the pretreatment device is connected to the air intake pipe; an air intake lift valve is arranged between the regenerative chamber and the air intake pipe, and the air intake lift valve controls the connection or disconnection of the air intake pipe with the regenerative chamber; a purge valve is arranged between the regenerative chamber and the purge pipe, and the purge valve controls the connection or disconnection of the purge pipe with the regenerative chamber; an exhaust lift valve is arranged between the regenerative chamber and the exhaust pipe, and the exhaust lift valve controls the exhaust pipe Connected or disconnected with the heat storage chamber; the combustion chamber is located above the combustion chamber, and a burner is arranged in the combustion chamber; the back-burning device includes a mixing box, a furnace bypass pipe, a return air duct, and a back-blowing pipe, the bypass pipe connects the combustion chamber and the mixing box, and is used to pass the high-temperature furnace flue gas generated by combustion in the combustion chamber into the mixing box, and the bypass pipe is provided with a high-temperature bypass valve; the return air duct is connected to the exhaust duct, and is used to pass the furnace bottom exhaust gas in the exhaust duct into the mixing box, and the return air duct is provided with a return air valve; the back-blowing pipe connects the mixing box and the purge pipe, and the back-blowing pipe is provided with a back-blowing valve, and is used to pass the mixed gas of the furnace high-temperature flue gas and the furnace bottom exhaust gas in the mixing box into the purge pipe, and the purge pipe is mixed with fresh air and passed into the heat storage chamber for back-burning, and the back-blowing pipe is provided with a back-blowing valve.

[0005] Preferably: the exhaust main pipe is provided with a plurality of exhaust inlets, and the cyclone dust collector is connected to one of the exhaust inlets in the exhaust main pipe; the exhaust main pipe is provided with an exhaust pressure sensor for detecting the air pressure in the exhaust main pipe, the air intake duct is provided with an exhaust fan, and the control device controls the frequency of the exhaust fan according to the data of the exhaust pressure sensor.

[0006] Preferably: the exhaust gas main pipe is also provided with a combustible gas detector, the air intake pipe is connected to a first fresh air duct, the connection position between the first fresh air duct and the air intake pipe is located at one end of the exhaust gas fan outlet, and a first fresh air regulating valve is arranged on the first fresh air duct, and the control device adjusts the opening of the first fresh air regulating valve according to the detection data of the combustible gas detector.

[0007] Preferably: a first temperature sensor is provided at the bottom of the heat storage chamber filler for detecting the temperature of the bottom of the heat storage chamber filler; a second temperature sensor is provided at the top of the heat storage chamber filler for detecting the temperature of the top of the heat storage chamber filler; a third temperature sensor is provided in the combustion chamber, and the control device adjusts the opening of the first fresh air regulating valve according to the data detected by the first temperature sensor and the second temperature sensor; the control device adjusts the opening of the first fresh air regulating valve according to the data detected by the third temperature sensor.

[0008] Preferably: a differential pressure transmitter is provided between the intake duct and the exhaust duct to detect the pressure difference between the intake duct and the exhaust duct, and the control device determines whether to connect the back-burning device according to the data detected by the differential pressure transmitter.

[0009] Preferably: the back-blowing pipeline is provided with a back-blowing temperature sensor, and the control device controls the opening of the high-temperature bypass valve or the return air valve according to the temperature of the back-blowing temperature sensor.

[0010] Preferably: a cooling component is also provided in the combustion chamber, and the cooling component includes a nozzle arranged in the combustion chamber for spraying cooling water into the combustion chamber; when the temperature measured by the third temperature sensor is higher than 950°C, the control device controls the cooling component to start.

[0011] Preferably: a first temperature control box and a second temperature control box are arranged between the mixing air box and the back-blowing pipe; the first temperature control box and the second temperature control box are both connected to the air outlet of the mixing air box, and the gas in the mixing air box is controlled to enter the first temperature control box or the second temperature control box through two air inlet switching valves, and the first temperature control box and the second control box are respectively provided with an air outlet switching valve for controlling the connection between the back-burning gas and the back-blowing pipe, and the two air outlet switching valves control the back-burning gas in the first temperature control box or the second temperature control box to enter the back-blowing pipe; the first temperature control box and the second temperature control box are provided with cooling components.

[0012] Preferably: an exhaust gas blower and an intake shut-off valve are arranged on the intake pipe, an emergency bypass pipe is arranged between the exhaust gas blower and the intake shut-off valve, and the emergency bypass pipe is provided with an emergency bypass valve; when the temperature measured by the third temperature sensor is higher than 1050°C, the intake shut-off valve is closed and the emergency bypass valve is opened.

[0013] The present application also provides a method for controlling the back-burning process of a thermal storage incineration system. Step 1: The heat storage chamber is connected to the furnace bottom exhaust gas: close the high-temperature bypass valve, delay 5 seconds to open the return air valve, and the valve opening is 50%; open the back-blowing valve, delay 5 seconds to close the second fresh air regulating valve; the purge fan drives the furnace bottom exhaust gas in the exhaust duct to pass through the return air duct, mixing box, and back-blowing duct in turn into the corresponding heat storage chamber for back-burning.

[0014] Step 2: The regenerator is connected to the high-temperature flue gas from the furnace: After the second step is completed, there is a delay of 5 seconds, the high-temperature bypass valve is opened, and the purge fan drives the high-temperature flue gas from the furnace in the combustion chamber to pass through the furnace bypass pipe, mixing box, and back-blowing pipe in sequence, and then mix with the exhaust gas from the furnace bottom and enter the corresponding regenerator for back-burning.

[0015] Step 3: The regenerator is connected to the back-blowing fresh air. After the second step is completed, delay for 5 seconds and open the back-blowing fresh air valve. The filtered air enters the purge pipe driven by the purge fan, so that the air is mixed with the high-temperature flue gas in the furnace and the exhaust gas at the bottom of the furnace and enters the energy storage chamber.

[0016] Step 4: Temperature control. According to the data detected by the back-burning temperature sensor in the back-blowing pipeline, the control device controls the opening of the high-temperature bypass valve or the return air valve to keep the temperature of the gas in the back-blowing pipeline at 250-300°C. According to the temperatures detected by the first temperature sensor, the second temperature sensor, and the third temperature sensor in the heat storage chamber, the openings of the high-temperature bypass valve, the return air valve, and the purge fresh air valve are controlled to make the temperature at the location of the first temperature sensor in the heat storage chamber 250-300°C.

[0017] Step 5: Continuous back-burning: Back-burning lasts for 1800 seconds to 2400 seconds; Step 6: End: Open the fresh air valve for purge, close the high-temperature bypass valve; delay 5 seconds to close the return air valve and back-blowing valve.

[0018] In summary, compared with the prior art, the present application has the following beneficial effects: through the various sensors set in the thermal storage combustion system, the working state of the thermal storage incineration system can be grasped in real time, and adjustments can be made quickly through the control device, so as to protect the thermal storage incineration system from running efficiently and stably, and reduce the risk of ignition and explosion. The setting of the mixing air box of the back-burning device can make the high-temperature flue gas in the furnace and the tail gas at the bottom of the furnace better mixed; and through the temperature detection of the back-blowing pipe, the control device controls the opening and closing of the high-temperature bypass valve and the return air valve to accurately control the mixing temperature of the high-temperature flue gas in the furnace and the tail gas at the bottom of the furnace. And through the purge pipe, it is passed into the thermal storage chamber for back-burning, and the overall switching is fast. In summary, compared with the prior art, the present application has the following beneficial effects: through the various sensors set in the thermal storage combustion system, the working state of the thermal storage incineration system can be grasped in real time, and adjustments can be made quickly through the control device, so as to protect the thermal storage incineration system from running efficiently and stably, and reduce the risk of ignition and explosion. The setting of the mixing air box of the back-burning device can make the furnace tail gas and the furnace bottom tail gas mix better; and through the temperature detection of the back-blowing pipeline, the control device controls the opening and closing of the high-temperature bypass valve and the return air valve to accurately control the mixed temperature of the furnace tail gas and the furnace bottom tail gas. And through the purge pipeline, it is passed into the heat storage chamber for back-burning, and the overall switching is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a pre-processing device in Example 1 of the present application; Figure 2 This is a schematic structural diagram of a thermal storage incineration device according to a first embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the second embodiment of the present application.

[0020] Description of reference numerals: 1. Pretreatment device; 11. Cyclone dust collector; 12. Cartridge degreaser; 13. Exhaust main pipe; 131. Exhaust pressure sensor; 132. Combustible gas detector; 2. Regenerative thermal oxidation device; 21. Combustion chamber; 211. Burner; 212. Air supply duct; 213. Combustion-supporting fan; 214. Third temperature sensor; 215. Furnace chamber pressure sensor; 22. Regenerative chamber; 221. Filler; 222. Intake lift valve; 223. Purge valve; 224. Exhaust lift valve; 225. First temperature sensor; 226. Second temperature sensor; 23. Intake duct; 231. Exhaust fan; 232. Intake shut-off valve; 233. Emergency bypass duct; 234. Emergency bypass valve; 235. First fresh air duct; 236. First fresh air regulating valve; 24. Purge duct; 241. Purge fan; 242. Purge 2. Sweep air filter; 243. Purge fresh air valve; 25. Exhaust duct; 251. Exhaust fan; 252. Second fresh air duct; 253. Second fresh air regulating valve; 254. Outlet flue gas temperature sensor; 26. Cooling component; 27. Pressure differential transmitter; 3. Back-burning device; 31. Mixing box; 32. Furnace bypass duct; 321. High-temperature bypass valve; 33. Return air duct; 331. Return air valve; 34. Back-burning device; 35. Mixing box; 36. Furnace bypass duct; 371. High-temperature bypass valve; 38. Return air duct; 39. Return air valve; 40. Blowing pipe; 341, back-blowing valve; 342, back-blowing temperature sensor; 35, pressure relief pipe; 351, pressure relief valve; 36, thermal insulation material; 4, smoke exhaust device; 5, cooling assembly; 51, liquid inlet pipe; 52, liquid outlet pipe; 53, radiator; 54, cooling pump; 6, first temperature control box; 61, liner; 62, cooling interlayer; 63, fins; 7, second temperature control box; 8, air inlet switching valve; 9, air outlet switching valve. DETAILED DESCRIPTION

[0021] like Figure 1 , Figure 2 As shown, a regenerative incineration system provided in an embodiment of the present application includes a control device, a pretreatment device 1, a regenerative oxidation device 2, a back-burning device 3 and a smoke exhaust device 4.

[0022] like Figure 1As shown, the pretreatment device 1 includes a cyclone dust collector 11 and a cartridge deoiler 12. The cyclone dust collector 11 is used to remove particulate matter with a particle size greater than 10 microns in the exhaust gas. The cartridge deoiler 12 is equipped with fiber cotton with a filter grade of G4+F5 for removing liquid tar in the exhaust gas. The cyclone dust collector 11 is connected through the exhaust gas main pipe 13 on the cartridge deoiler 12. In addition to connecting the exhaust gas that has been dedusted by the cyclone dust collector 11, the exhaust gas main pipe 13 can also receive other types of exhaust gas. In this way, according to the different types of exhaust gas, the exhaust gas can be selected to be first dedusted by the cyclone dust collector 11, and then the liquid tar in the exhaust gas can be removed by the cartridge deoiler 12. Such exhaust gas is such as asphalt fume in a granulation plant. It is also possible to skip the cyclone dust collector 11 and directly connect the cartridge deoiler 12 by connecting the interface of the exhaust gas main pipe 13. Such exhaust gas is such as non-condensable gas in a vacuum pump. According to different types of exhaust gas, the corresponding connection scheme is selected.

[0023] like Figure 2 As shown, the pre-treated exhaust gas is introduced into the thermal storage oxidation device 2, which includes a combustion chamber 21 and three thermal storage chambers 22. The combustion chamber 21 is located above the thermal storage chamber 22 and is interconnected. The thermal storage chamber 22 is filled with fillers 221, and the fillers 221 are respectively regular fillers 221 and saddle ring fillers 221 from top to bottom. The thermal storage oxidation device 2 includes an intake pipe 23, a purge pipe 24 and an exhaust pipe 25. The thermal storage chambers 22 are respectively connected to the intake pipe 23, the purge pipe 24 and the exhaust pipe 25. The thermal storage chambers 22 are connected and disconnected with the intake pipe 23 through the intake lift valve 222, and the thermal storage chambers 22 are connected and disconnected with the purge pipe 24 through the purge valve 223. Each thermal storage chamber 22 is connected and disconnected with the exhaust pipe 25 through each exhaust lift valve 224.

[0024] Specifically, the pretreated exhaust gas is connected to the air intake pipe 23, on which an exhaust fan 231 and an intake shut-off valve 232 are provided. The exhaust fan 231 is a variable frequency fan. An emergency bypass pipe 233 is provided between the exhaust fan 231 and the intake shut-off valve 232, and the emergency bypass pipe 233 is provided with an emergency bypass valve 234. The exhaust fan 231 drives the exhaust gas into the heat storage chamber 22 through the intake lift valve 222. The air intake pipe 23 is also connected to a first fresh air pipe 235. The connection position of the first fresh air pipe 235 and the air intake pipe 23 is located at one end of the exhaust fan 231 where air is discharged. A first fresh air regulating valve 236 is provided on the first fresh air pipe 235. The purge duct 24 is provided with a purge fan 241, which is a variable frequency fan. A purge air filter 242, a purge fresh air valve 243 and the purge fan 241 are provided at one end of the air intake. The purge fan 241 drives the gas into the heat storage chamber 22 through the purge valve 223. The exhaust duct 25 is connected to the smoke exhaust device 4 at one end relative to the heat storage chamber 22. The smoke exhaust device 4 is a chimney. The exhaust duct 25 is provided with an exhaust fan 251, which is a variable frequency fan and is used to send the exhaust gas to the chimney for discharge. The exhaust duct 25 is connected to a second fresh air duct 252, and a second fresh air regulating valve 253 is provided on the second fresh air duct 252. A burner 211 is arranged in the combustion chamber 21. The burner 211 is connected to a natural gas pipeline and an air supply pipeline 212. The air supply pipeline 212 is provided with a combustion-supporting fan 213. The combustion-supporting fan 213 is a variable frequency fan. The combustion-supporting fan 213 is used to provide a sufficient amount of air to the combustion chamber 21, so that the combustibles entering the combustion chamber 21 can be continuously oxidized and burned. The heat storage chamber 22 is opened by opening one of the intake lift valve 222, the purge valve 223, and the exhaust lift valve 224, while the other two are closed, so that a single heat storage chamber 22 switches the working mode in the order of "intake-purge-exhaust", and the three heat storage chambers 22 respectively perform different working modes. The temperature of the combustion chamber 21 is maintained at 760-820°C, and the waste gas stays in the combustion chamber 21 for more than 1s. The waste gas in the combustion chamber 21 reacts with oxygen to generate CO2, NOX, SO2 and H2O.

[0025] The back-burning device 3 includes a mixing box 31, a furnace bypass pipe 32, a return air pipe 33, a back-blowing pipe 34, and a pressure relief pipe 35. The mixing box 31 is provided with two air inlets, one of which is connected to the combustion chamber 21 through the furnace bypass pipe 32, and the furnace bypass pipe 32 is provided with a high-temperature bypass valve 321. The furnace bypass pipe 32 is used to pass the furnace high-temperature flue gas generated by the combustion in the combustion chamber 21 into the mixing box 31. The other air inlet is connected to the exhaust pipe 25 through the return air pipe 33, and the return air pipe 33 is provided with a return air valve 331. The position where the return air pipe 33 is connected to the exhaust pipe 25 is located at one end of the exhaust fan 251. The mixing box 31 is also provided with two air outlets, one of which is connected to the purge pipe 24 through the back-blowing pipe 34, and the connection position between the back-blowing pipe 34 and the purge pipe 24 is located at one end of the purge fan 241. Another air outlet is connected to the exhaust duct 25 through a pressure relief duct 35. The connection position of the pressure relief duct 35 and the exhaust duct 25 is located at one end of the exhaust fan 251. A pressure relief valve 351 is provided on the pressure relief duct 35. The furnace bypass duct 32, the return air duct 33 and the back-blowing duct 34 are covered with a heat-insulating material 36.

[0026] When the thermal storage oxidation device 2 needs to perform backburning, the air inlet of the air mixing box 31 is connected to the combustion chamber 21 and the exhaust pipe 25, and the air outlet of the air mixing box 31 is connected to the purge pipe 24, and the high-temperature flue gas in the furnace and the tail gas at the bottom of the furnace formed after combustion are introduced into the thermal storage chamber 22 through the purge fan 241. The control device controls the ratio between the high-temperature flue gas in the furnace, the tail gas at the bottom of the furnace, and the fresh air by controlling the opening of the high-temperature bypass valve 321, the return air valve 331, the back-blowing valve 341, and the purge fresh air valve 242, thereby controlling the temperature of the backburning gas entering the thermal storage chamber 22, wherein the opening of the purge fresh air valve 242 corresponds to the amount of fresh air entering the purge pipe 24, which is used to reduce the gas temperature entering the thermal storage chamber 22 during backblowing or backburning. In the backburning mode of the present application, the set temperature of the above-mentioned mixed gas entering the thermal storage chamber 22 is 250°C-300°C, thereby achieving the best backburning effect.

[0027] A cooling component 26 is also provided in the combustion chamber 21. The cooling component 26 includes a nozzle arranged in the combustion chamber 21. The nozzle is used to spray cooling water into the combustion chamber 21 to cool the furnace through the vaporization of the cooling water. When the temperature exceeds a preset value (such as 850°C), the cooling component 26 is started, and high-pressure water is sprayed into the furnace in a scattered manner, vaporizing and absorbing heat, thereby controlling the temperature of the combustion chamber 21 within a set range, making the operation of the thermal storage incineration system safer.

[0028] The operation process of the regenerative incineration system is as follows: 1. Pretreatment: The cyclone dust collector 11 and the cartridge oil remover 12 remove particulate matter with a particle size greater than 10 μm and liquid tar in the exhaust gas.

[0029] 2. Thermal storage oxidation, the burner 211 burns, and the control device controls the cyclic opening and closing of the air intake lift valve 222, the purge valve 223, and the exhaust lift valve 224. A single heat storage chamber 22 cyclically switches the working mode in the order of "intake-purge-exhaust", and the three heat storage chambers 22 each execute a different working mode.

[0030] 3. Back-burning: the high-temperature flue gas in the furnace of the combustion chamber 21 and the tail gas at the bottom of the furnace in the exhaust pipe 25 are mixed in the air mixing box 31; the mixed tail gas enters the back-blowing pipe 34, and is mixed with the fresh air in the purge pipe 24, and is passed into the heat storage chamber 22 through the purge pipe 24 and the purge valve 223.

[0031] 4. Exhaust: the exhaust gas in the exhaust pipe 25 is discharged through the chimney.

[0032] In order to facilitate the monitoring of the operation status of the regenerative incineration system, the sensors used are at least: an exhaust gas pressure sensor 131 is arranged on the exhaust gas main pipe 13, which is used to detect the air pressure in the exhaust gas main pipe 13; a combustible gas detector 132 is also arranged on the exhaust gas main pipe 13, which is used to detect the combustible gas in the exhaust gas main pipe 13. A first temperature sensor 225 is arranged at the bottom of the regenerative chamber 22 corresponding to the filler 221, which is used to detect the temperature at the bottom of the regenerative chamber 22 filler 221; a second temperature sensor 226 is arranged at the top of the regenerative chamber 22 corresponding to the filler 221, which is used to detect the temperature at the top of the regenerative chamber 22 filler 221; a third temperature sensor 214 is arranged in the combustion chamber 21, which is used to detect the temperature in the combustion chamber 21. An outlet flue gas temperature sensor 254 is arranged on the exhaust pipe 25. A back-blowing temperature sensor 342 is arranged in the back-blowing pipe 34. A furnace chamber pressure sensor 215 is arranged in the combustion chamber 21, which is used to detect the air pressure in the combustion chamber 21. A pressure difference transmitter 27 is provided between the air intake pipe 23 and the exhaust pipe 25 for detecting the pressure difference between the air intake pipe 23 and the exhaust pipe 25 .

[0033] During the above operation, the control device makes the following instructions according to the operation status of the thermal storage incineration system: 1. According to the data detected by the exhaust gas pressure sensor 131, the control device adjusts the frequency of the exhaust gas fan 231 to maintain the air pressure of the exhaust gas main pipe 13 at -2KPa, so that the air intake pipe 23 can maintain a sufficient amount of exhaust gas entering the thermal storage oxidation device 2, thereby improving the exhaust gas treatment efficiency of the thermal storage incineration system.

[0034] 2. Based on the data measured by the combustible gas detector 132 on the exhaust main pipe 13, the control device adjusts the opening of the first fresh air regulating valve 236 to keep the gas entering the combustion chamber 21 through the intake pipe 23 at the lower explosion limit concentration. According to the different types of exhaust gas, the corresponding lower explosion limit concentration value is preset in the control device, and the exhaust gas concentration is reduced by mixing in fresh air, thereby reducing the possibility of deflagration in the thermal storage oxidation device 2.

[0035] 3. According to the data of the furnace chamber pressure sensor 215 in the combustion chamber 21, the frequency of the exhaust fan 251 is adjusted to keep the air pressure in the combustion chamber 21 between 0 and -50 KPa, which can effectively prevent the safety hazard caused by excessive pressure in the combustion chamber 21.

[0036] 4. According to the data detected by the first temperature sensor 225 in the heat storage chamber 22, the control device adjusts the opening of the first fresh air regulating valve 236 to control the concentration of the exhaust gas, maintain the temperature of the lower part of the filler 221 of the heat storage chamber 22 at 300°C, and keep the heat storage chamber 22 in an efficient temperature range.

[0037] 5. According to the data detected by the second temperature sensor 226 in the heat storage chamber 22, the control device adjusts the opening of the first fresh air regulating valve 236 to keep the temperature of the lower part of the filler 221 of the heat storage chamber 22 within 850°C, so that the heat storage chamber 22 is kept in an efficient temperature range.

[0038] 6. According to the data detected by the third temperature sensor 214 in the combustion chamber 21, the control device can control the opening of the first fresh air regulating valve 236, or the opening of the high-temperature bypass valve 321, or the power of the burner 211; when the temperature reaches above 950°C, the cooling component 26 is started, and the nozzle in the combustion chamber 21 sprays cooling water into the combustion chamber 21 for cooling, and the combustion chamber 21 is quickly cooled by spraying cooling water.

[0039] When the temperature detected by the first temperature sensor 225 is higher than 300°C, or the temperature detected by the second temperature sensor 226 is higher than 950°C, or the temperature detected by the third temperature sensor 214 is higher than 950°C, the control device increases the opening of the first fresh air regulating valve 236 and closes the regulating burner 211. When the temperature detected by the third temperature sensor 214 is higher than 1050°C, the air intake cut-off valve 232 is closed, and the emergency bypass valve 234 is opened, and the system is shut down to avoid high temperature damage to the combustion chamber 21 and protect the safety of the thermal storage incineration system.

[0040] 7. According to the data detected by the pressure difference transmitter 27 between the air inlet pipe 23 and the exhaust pipe 25, when the pressure difference reaches 4KPa, the control device controls the system to switch to the reverse burning mode, so that the regenerative incineration system automatically switches to the reverse burning mode, so that the regenerative chamber 22 maintains an efficient processing state.

[0041] 8. In the back-burning mode, the control device controls the opening of the high-temperature bypass valve 321 or the return air valve 331 according to the data detected by the back-blowing temperature sensor 342 provided in the back-blowing pipe 34, and keeps the temperature of the gas in the back-blowing pipe 34 at 250-300°C. When the temperature detected by the outlet flue gas temperature sensor 254 is higher than 200°C, the burner 211 is turned off. When the temperature detected by the back-blowing temperature sensor 342 is higher than 250°C, the system is shut down to protect the regenerative incineration system from high temperature damage.

[0042] This application also provides a control method for the back-burning process of a thermal storage incineration system: Step 1: Switching the reverse burning mode. The control device controls the thermal storage incineration system to switch to the reverse burning mode according to the data detected by the pressure difference transmitter 27 between the air intake pipe 23 and the exhaust pipe 25. When the pressure difference reaches 4KPa, the control device controls the thermal storage incineration system to switch to the reverse burning mode.

[0043] Step 2: The heat storage chamber 22 is connected to the furnace bottom exhaust gas: close the high-temperature bypass valve 321, delay 5 seconds to open the return air valve 331, and the valve opening is 50%; open the back-blowing valve 341, delay 5 seconds to close the second fresh air regulating valve 253; the purge fan 241 drives the furnace bottom exhaust gas in the exhaust duct 25 to pass through the return air duct 33, the mixing box 31, and the back-blowing duct 34 in turn into the corresponding heat storage chamber 22 for back-burning.

[0044] Step 3: The regenerator 22 is connected to the furnace high-temperature flue gas: After the second step is completed, there is a delay of 5 seconds, the high-temperature bypass valve 321 is opened, and the purge fan 241 drives the furnace high-temperature flue gas in the combustion chamber 21 to pass through the furnace bypass pipe 32, the mixing box 31, and the back-blowing pipe 34 in sequence. The furnace high-temperature flue gas is mixed with the furnace bottom exhaust gas and enters the corresponding regenerator 22 for back-burning.

[0045] Step 4: The heat storage chamber 22 is connected to the back-blowing fresh air. After the second step is completed, delay 5 seconds and open the back-blowing fresh air valve. The filtered air enters the purge pipe 24 driven by the purge fan 241, so that the air is mixed with the high-temperature flue gas in the furnace and the exhaust gas at the bottom of the furnace and enters the energy storage chamber.

[0046] Step 4: Temperature control. According to the data detected by the back-blowing temperature sensor 342 in the back-blowing pipe 34, the control device controls the opening of the high-temperature bypass valve 321 or the return air valve 331 to keep the temperature of the gas in the back-blowing pipe 34 at 250-300°C. According to the temperatures detected by the first temperature sensor 225, the second temperature sensor 226, and the third temperature sensor 214 in the heat storage chamber 22, the openings of the high-temperature bypass valve 321, the return air valve 331, and the fresh air purge valve 243 are controlled to make the temperature at the location of the first temperature sensor 225 in the heat storage chamber 22 250-300°C.

[0047] Step 5: Continuous back-burning: Back-burning lasts for 1800 seconds to 2400 seconds; Step 6: End: Open the purge fresh air valve 243, close the high-temperature bypass valve 321; delay 5 seconds to close the return air valve 331 and the back-blowing valve 341.

[0048] Embodiment 2: Compared with the first embodiment, the difference of this embodiment is that a temperature control box is arranged between the air mixing box 31 and the back-blowing pipe 34, and two temperature control boxes are arranged, namely the first temperature control box 6 and the second temperature control box 7; the first temperature control box 6 and the second temperature control box 7 are both connected to the air outlet of the air mixing box 31, and the gas in the air mixing box 31 is controlled to enter the first temperature control box 6 or the second temperature control box 7 through two air inlet switching valves 8, and the back-burning gas in the first temperature control box 6 or the second temperature control box 7 is controlled to enter the back-blowing pipe 34 through two air outlet switching valves 9; wherein the box wall of the first temperature control box 6 and the second temperature control box 7 and the inner liner 61, and the inner liner 61 and the box wall A cooling interlayer 62 is formed between the first temperature control box 6 and the second temperature control box 7. A cooling assembly 5 is connected to the first temperature control box 6 and the second temperature control box 7. The cooling assembly 5 includes a liquid inlet pipe 51, a liquid outlet pipe 52, a cooling pump 54 and a radiator 53. The liquid inlet pipe 51 and the liquid outlet pipe 52 are connected to the cooling interlayer 62. The radiator 53 is arranged between the liquid inlet pipe 51 and the liquid outlet pipe 52. The cooling pump 54 is arranged at the liquid outlet pipe 52. Driven by the cooling pump 54, the cooling medium enters the cooling interlayer 62 through the liquid inlet pipe 51. After the cooling medium exchanges heat with the inner tank 61, it flows out through the liquid outlet pipe 52. After the cooling medium with a higher temperature dissipates heat through the radiator 53, the next cycle is carried out. The inner liner 61 is made of a material with good thermal conductivity, preferably aluminum alloy, and a plurality of fins 63 arranged in parallel in the longitudinal direction are fixed on the inner wall of the inner liner 61, and two adjacent fins 63 are staggered, so that a serpentine airflow channel is formed between the plurality of fins 63 and the inner wall of the inner liner 61, so that the backburning gas flowing out of the air mixing box 31 flows in a zigzag manner in the inner liner 61, and sufficient heat exchange is achieved between the gas and the inner liner 61 and the fins 63, thereby improving the cooling effect of the cooling assembly 5. In this embodiment, the cooling medium can be water or cooling oil.

[0049] When the regenerative incineration system executes the backburning procedure, the furnace flue gas of the combustion chamber 21 and the furnace bottom tail gas on the exhaust pipe 25 are mixed in a certain proportion in the air mixing box 31 to form backburning gas. The temperature of the backburning gas is controlled at 300-350°C. The power of the radiator 53 and the cooling pump 54 on the cooling component 5 is adjusted according to the temperature control of the air outlet in the air mixing box 31. The backburning gas enters the backblowing pipe 34 after secondary cooling through the first temperature control box 6 or the second temperature control box 7.

[0050] The first temperature control box 6 and the second temperature control box 7 work alternately. Specifically, the back-burning gas stored in the first temperature control box 6 is cooled by the cooling component 5, so that the back-burning gas temperature is accurately controlled at 250-300°C. The corresponding air inlet switching valve 8 and the air outlet switching valve 9 of the first temperature control box 6 are opened, and the back-blowing pipe 34 is connected to the first temperature control box 6, so that the back-burning gas after temperature control in the first temperature control box 6 enters the heat storage chamber 22 through the back-blowing pipe 34, and at the same time, the gas in the mixing box 31 gradually fills up the first temperature control box 6, that is, the cooled gas in the first temperature control box 6 is cooled. When the body is completely discharged, the high-temperature backburning gas discharged from the mixing box 31 has just filled up the first temperature-controlled box 6. At this time, the air inlet switching valve 8 and the air outlet switching valve 9 are closed; while the first temperature-controlled box 6 is discharging the backburning gas, the backburning gas in the second mixing box 31 is cooled by the cooling component 5, so that the temperature drops to 250-300°C. After the first temperature-controlled box 6 has completed discharging the backburning gas, the air inlet switching valve 8 and the air outlet switching valve 9 corresponding to the second temperature-controlled box 7 are opened, and the back-blowing pipe 34 is connected to the second temperature-controlled box 7, and the two systems work in this reciprocating manner.

[0051] Since the back-burning gas entering the back-blowing pipe 34 is first mixed in the air mixing box 31 for the first temperature control, and then passed through the first temperature control box 6 or the second temperature control box 7 for the second temperature control, the temperature of the back-burning gas entering the back-blowing pipe 34 can be accurately controlled. The advantage of this is that the back-burning gas discharged from the air mixing box 31 can have a larger temperature range, and the mixing ratio of the high-temperature flue gas in the combustion chamber 21 and the furnace bottom tail gas in the exhaust pipe 25 does not need to be very accurate, and is less affected by the combustion conditions of the combustion chamber 21, which reduces the difficulty of control program design; since the first temperature control box 6 and the second temperature control box 7 are used alternately, that is, one of the temperature control boxes exhausts and the other temperature control box performs temperature control cooling, the back-burning gas can have a longer cooling time, so that the control program for the cooling component 5 can also be simpler, and the power of the cooling component 5 is correspondingly lower.

[0052] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A regenerative incineration system, characterized in that: The invention comprises a control device (5) and a pretreatment device (1), a thermal storage oxidation device (2), a back-burning device (3) and a smoke exhaust device (4) controlled by the control device (5); the pretreatment device (1) comprises a cyclone dust collector (11) for removing particulate matter in the exhaust gas and a cartridge oil remover (12) for removing liquid tar in the exhaust gas; the thermal storage oxidation device (2) comprises at least three thermal storage chambers (22), a combustion chamber (21), an air intake pipe (23), a purge pipe (24) and an exhaust pipe (25); the exhaust gas treated by the pretreatment device (1) is connected to the air intake pipe (23); an intake lift valve (222) is provided between the heat storage chamber (22) and the intake pipe (23), and the intake lift valve (222) controls the connection or disconnection between the intake pipe (23) and the heat storage chamber (22); a purge valve (223) is provided between the heat storage chamber (22) and the purge pipe (24), and the purge valve (223) controls the connection or disconnection between the purge pipe (24) and the heat storage chamber (22); an exhaust lift valve (224) is provided between the heat storage chamber (22) and the exhaust pipe (25), and the exhaust lift valve (224) controls the exhaust pipe (25) 5) connected or disconnected with the heat storage chamber (22); the combustion chamber (21) is located above the heat storage chamber (22), and a burner (211) is arranged in the combustion chamber (21); the back-burning device (3) comprises an air mixing box (31), a furnace bypass pipe (32), a return air pipe (33), and a back-blowing pipe (34); the bypass pipe connects the combustion chamber (21) and the air mixing box (31), and is used to pass the furnace high-temperature flue gas generated by combustion in the combustion chamber (21) into the air mixing box (31); the bypass pipe is provided with a high-temperature bypass valve (321); the return air pipe (33) The exhaust duct is connected, and is used to pass the furnace bottom tail gas in the exhaust duct into the air mixing box (31). The return air duct (33) is provided with a return air valve (331); the back-blowing duct (34) is connected to the air mixing box (31) and the purge duct (24). The back-blowing duct (34) is provided with a back-blowing valve (341). The mixed gas of the furnace high-temperature flue gas and the furnace bottom tail gas in the air mixing box (31) is passed into the purge duct (24), and is passed from the purge duct (24) into the heat storage chamber (22) for back-burning. The back-blowing duct (34) is provided with a back-blowing valve (341).

2. A regenerative incineration system according to claim 1, characterized in that: The exhaust gas main pipe (13) is provided with a plurality of exhaust gas inlets, and the cyclone dust collector (11) is connected to one of the exhaust gas inlets in the exhaust gas main pipe (13); the exhaust gas main pipe (13) is provided with an exhaust gas pressure sensor (131) for detecting the air pressure in the exhaust gas main pipe (13); the air intake pipe (23) is provided with an exhaust gas fan (231); and the control device (5) controls the frequency of the exhaust gas fan (231) according to data from the exhaust gas pressure sensor (131).

3. A regenerative thermal incineration system according to claim 1, characterized in that: The exhaust gas main pipe (13) is further provided with a combustible gas detector (132); the air intake pipe (23) is connected with a first fresh air pipe (235); the connection position between the first fresh air pipe (235) and the air intake pipe (23) is located at one end of the exhaust gas fan (231) where air is discharged; a first fresh air regulating valve (236) is provided on the first fresh air pipe (235); and the control device (5) adjusts the opening of the first fresh air regulating valve (236) according to the detection data of the combustible gas detector (132).

4. A regenerative thermal incineration system according to claim 1, characterized in that: A first temperature sensor (225) is provided at the bottom of the filler (221) of the heat storage chamber (22) for detecting the temperature of the bottom of the filler (221) of the heat storage chamber (22); a second temperature sensor (226) is provided at the top of the filler (221) of the heat storage chamber (22) for detecting the temperature of the top of the filler (221) of the heat storage chamber (22); a third temperature sensor (214) is provided in the combustion chamber (21); the control device (5) adjusts the opening of the first fresh air regulating valve (236) according to the data detected by the first temperature sensor (225) and the second temperature sensor (226); the control device (5) adjusts the opening of the first fresh air regulating valve (236) according to the data detected by the third temperature sensor (214).

5. A regenerative thermal incineration system according to claim 1, characterized in that: A pressure differential transmitter (27) is provided between the air intake pipe (23) and the exhaust pipe (25) for detecting the pressure difference between the air intake pipe (23) and the exhaust pipe (25). The control device (5) determines whether to connect the back-burning device (3) based on the data detected by the pressure differential transmitter (27).

6. A regenerative thermal incineration system according to claim 1, characterized in that: The back-blowing pipe (34) is provided with a back-blowing temperature sensor (342), and the control device (5) controls the opening of the high-temperature bypass valve (321) or the return air valve (331) according to the temperature of the back-blowing temperature sensor (342).

7. A regenerative thermal incineration system according to claim 1, characterized in that: A cooling component (26) is also provided in the combustion chamber (21), and the cooling component (26) comprises a nozzle arranged in the combustion chamber (21) and used for spraying cooling water into the combustion chamber (21); when the temperature measured by the third temperature sensor (214) is higher than 950° C., the control device (5) controls the cooling component (26) to spray cooling water into the furnace.

8. A regenerative thermal incineration system according to claim 7, characterized in that: A first temperature control box (6) and a second temperature control box (7) are arranged between the air mixing box (31) and the back-blowing pipe (34); the first temperature control box (6) and the second temperature control box (7) are both connected to the air outlet of the air mixing box (31), and two air inlet switching valves (8) are used to control the gas in the air mixing box (31) to enter the first temperature control box (6) or the second temperature control box (7); the first temperature control box (6) and the second control box are respectively provided with an air outlet switching valve (9) for controlling the back-burning gas to be connected to the back-blowing pipe (34); the two air outlet switching valves (9) control the back-burning gas in the first temperature control box (6) or the second temperature control box (7) to enter the back-blowing pipe (34); the first temperature control box (6) and the second temperature control box (7) are provided with a cooling assembly (5).

9. A regenerative thermal incineration system according to claim 7, characterized in that: An exhaust gas fan (231) and an intake shut-off valve (232) are provided on the intake pipe (23); an emergency bypass pipe (233) is provided between the exhaust gas fan (231) and the intake shut-off valve (232); and the emergency bypass pipe (233) is provided with an emergency bypass valve (234); when the temperature measured by the third temperature sensor (214) is higher than 1050° C., the intake shut-off valve (232) is closed and the emergency bypass valve (234) is opened.

10. A method for controlling the backburning process of a thermal storage incineration system, characterized in that: Using the regenerative thermal incineration system as described in claims 1-9, Step 1: The regenerator (22) is connected to the furnace bottom tail gas: the high temperature bypass valve (321) is closed, and the return air valve (331) is opened after a delay of 5 seconds, with the valve opening degree being 50%; the back-blowing valve (341) is opened, and the second fresh air regulating valve (253) is closed after a delay of 5 seconds; the purge fan (241) drives the furnace bottom tail gas in the exhaust duct (25) to pass through the return air duct (33), the air mixing box (31), and the back-blowing duct (34) in sequence and enter the corresponding regenerator (22) for back-burning; Step 2: The regenerator (22) is connected to the furnace high-temperature flue gas: after the first step is completed, a delay of 5 seconds is made to open the high-temperature bypass valve (321), and the purge fan (241) drives the furnace high-temperature flue gas in the combustion chamber (21) to pass through the furnace bypass pipe (32), the air mixing box (31), and the back-blowing pipe (34) in sequence, and then mix with the furnace bottom exhaust gas and enter the corresponding regenerator (22) for back-burning; Step 3: The regenerator (22) is connected to back-blowing fresh air. After the second step is completed, a delay of 5 seconds is made to open the back-blowing fresh air valve. The filtered air enters the purge pipe (24) driven by the purge fan (241), so that the air is mixed with the high-temperature flue gas in the furnace and the tail gas at the bottom of the furnace and enters the energy storage chamber; Step 4: Temperature control. According to the data detected by the back-burning temperature sensor in the back-blowing pipe (34), the control device (5) controls the opening of the high-temperature bypass valve (321) or the return air valve (331) to keep the temperature of the gas in the back-blowing pipe (34) at 250-300°C. According to the temperatures detected by the first temperature sensor (225), the second temperature sensor (226), and the third temperature sensor (214) in the heat storage chamber (22), the openings of the high-temperature bypass valve (321), the return air valve (331), and the fresh air purge valve (243) are controlled to make the temperature at the location of the first temperature sensor (225) in the heat storage chamber (22) 250-300°C. Step 5: Continuous back-burning: Back-burning lasts for 1800 seconds to 2400 seconds; Step 6: End: Open the fresh air purge valve (243), close the high temperature bypass valve (321); delay 5 seconds to close the return air valve (331) and the back-blowing valve (341).

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