RTO thermal storage combustion after-treatment system

Abstract

The present invention relates to the field of waste gas treatment technology, in particular to an RTO thermal storage combustion post-treatment system, comprising a flue gas anti-corrosion pipeline installed at the exhaust gas outlet of the RTO thermal storage combustion equipment, the end of the flue gas anti-corrosion pipeline being connected to an external exhaust gas collection system, a cooling device, a first alkali washing device, and a second alkali washing device being sequentially installed at the end of the flue gas anti-corrosion pipeline, the cooling device being used to cool the high-temperature flue gas at the exhaust gas outlet of the RTO thermal storage combustion equipment and complete preliminary treatment of the exhaust gas, the first alkali washing device being arranged downstream of the cooling device and being used to perform a single alkali washing of the cooled exhaust gas. This system is mainly used for rapid cooling and multi-stage and multi-effect alkali washing of the high-temperature flue gas at the exhaust gas outlet of the RTO thermal storage combustion equipment, so that the acidic substances can be further neutralized through the alkali washing operation effectively, and the acidic substances can be completely removed, so that the flue gas meets the emission standards.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a new system capable of post-processing the combustion of sulfides, chlorides, nitrides and other substances in waste gas, so as to reduce the content of halogens, sulfur-containing and nitrogen-containing inorganic substances and other substances in flue gas, especially an RTO thermal storage combustion post-treatment system. Background Art

[0002] The RTO thermal storage combustion system is mainly used in situations where the organic waste gas concentration is low and the waste gas volume is large. It can also be used when the organic waste gas contains corrosive substances that are toxic to catalysts and certain odors need to be oxidized at a higher temperature. During operation, the waste gas sent from the boundary area is thermally oxidized by the RTO thermal storage combustion oxidation system, and the sulfides, chlorides, nitrides and other substances in the waste gas are burned.

[0003] During the combustion of the above substances, halogen, sulfur, and nitrogen-containing inorganic substances are generally produced. These substances not only corrode the equipment, but also have strict requirements on the concentration of such substances in the flue gas emission standards. However, the existing RTO thermal storage combustion system cannot meet the emission requirements in most cases, so it must be equipped with a necessary post-processing system.

[0004] For example, in the patent document with patent application number CN201910084446.X, a structure named: high-concentration organic waste gas treatment system is disclosed, which mainly includes an RTO heat storage combustion device and a heat exchange CO device connected in sequence, the RTO heat storage combustion device includes an air inlet, a heat storage chamber, a combustion chamber, a heat bypass and an air outlet, the heat storage chamber includes a preheating zone and a cooling zone, the lower end of the preheating zone is connected to the air inlet, the upper end of the preheating zone is connected to the combustion chamber, the lower end of the cooling zone is connected to the air outlet, the upper end of the cooling zone is connected to the combustion chamber, one end of the heat bypass is connected to the combustion chamber, the other end of the heat bypass is connected to the inlet end of the heat exchange CO device after merging with the air outlet, and the outlet end of the heat exchange CO device is connected to the chimney; the exhaust gas concentration at the air inlet is greater than 6g / m3, the treatment efficiency of the treatment system is 999‰, and the gas concentration discharged from the chimney is lower than 60mg / m3.

[0005] Although the above patent can realize the subsequent treatment of combustion products, its treatment effect on pollutant gases is not outstanding, and its waste of heat of the entire flue gas is actually quite serious.

[0006] To this end, our company has improved the post-treatment process for the combustion treatment of existing equipment and designed a new system that can post-treat the combustion of sulfides, chlorides, nitrides and other substances in the exhaust gas. The RTO thermal storage combustion post-treatment system is used to reduce the content of halogens, sulfur-containing, nitrogen-containing inorganic substances and other substances in the flue gas, so as to better solve the problems existing in the existing technology. Summary of the invention

[0007] The present invention solves one of the above-mentioned technical problems, and the technical solution adopted is: an RTO thermal storage combustion post-treatment system, comprising a flue gas anti-corrosion pipeline installed at the exhaust gas outlet end of the RTO thermal storage combustion equipment, the end of the flue gas anti-corrosion pipeline is connected to an external exhaust gas collection system, and a cooling device, a first alkali washing device, and a second alkali washing device are sequentially installed at the end of the flue gas anti-corrosion pipeline, the cooling device is used to cool the high-temperature flue gas at the exhaust gas outlet end of the RTO thermal storage combustion equipment and complete the preliminary treatment of the exhaust gas, the first alkali washing device is arranged downstream of the cooling device and is used to achieve a primary alkali washing of the cooled exhaust gas, and the second alkali washing device is arranged downstream of the first alkali washing device and achieves multi-stage recoil alkali washing of the cooled exhaust gas.

[0008] In any of the above schemes, it is preferred that a heat exchange bin is installed on the flue gas anti-corrosion pipeline upstream of the cooling device, and a plurality of heat exchange guide pipes are installed in the heat exchange bin, the air inlet end of each of the heat exchange guide pipes is connected to the flue gas anti-corrosion pipeline through a front hollow end cover, and the outlet end of each of the heat exchange guide pipes is connected to the cooling device through a rear hollow end cover, a heat storage outlet pipe is installed at the bottom of the heat exchange bin, an air outlet solenoid valve is installed on the heat storage outlet pipe, the end of the heat storage outlet pipe is connected to the heat storage chamber of the RTO heat storage combustion equipment through a pipeline, a gas inlet pipe is installed on the upper part of the heat exchange bin, an air intake solenoid valve is installed on the gas inlet pipe, and the air inlet end of the gas inlet pipe is connected to an external air source.

[0009] In any of the above schemes, it is preferred that a transfer capillary with a transfer valve is installed above the heat exchange bin, and both ends of the transfer capillary are respectively connected to the interior of the heat exchange bin, and a reciprocating piston is installed in the heat exchange bin, and the reciprocating piston is movable through the mounting holes thereon and sealingly sleeved on the outer side walls of the corresponding heat exchange flow guide tubes, and a corrosion-resistant reciprocating displacement electric cylinder is installed at the center of the inner end surface of the front hollow end cover, and the front end of the piston rod of the corrosion-resistant reciprocating displacement electric cylinder is connected to the reciprocating piston, and the corrosion-resistant reciprocating displacement electric cylinder cooperates with the reciprocating piston to realize left and right reciprocating transfer of the gas to be burned entering the heat exchange bin through reciprocating motion; a temperature sensor and a pressure sensor are installed on the heat exchange bin, and the temperature sensor and the pressure sensor are connected to the external control system signal.

[0010] In any of the above schemes, it is preferred that the cooling device includes a cooling tank installed at the outlet end of the rear hollow end cover, the interior of the cooling tank is filled with water-washing coolant, and a gas-liquid separator is installed at the top outlet end of the cooling tank, the gas outlet end of the gas-liquid separator is connected to the first alkaline washing device, and the liquid outlet end of the gas-liquid separator is connected back to the interior of the cooling tank.

[0011] In any of the above schemes, preferably, a circulating water pump is installed on one side of the cooling tank through a pipeline, and the circulating water pump is used to continuously circulate water from an external cooling water source in the cooling tank and between the cooling tank.

[0012] In any of the above schemes, it is preferred that the first alkali washing device includes a first alkali washing tank installed at the outlet end of the rear hollow end cover, a spiral overflow pipe is installed in the first alkali washing chamber of the first alkali washing tank, the upper inlet end of the spiral overflow pipe is connected to the outlet end of the hollow end cover and a first-stage booster pump is installed at its port, the end of the spiral overflow pipe is sealed and a plurality of jet air holes are provided on its outer side wall, the first-stage exhaust valve at the top of the first alkali washing tank is connected to the second alkali washing device through a connecting pipe, and a second booster pump is installed on the connecting pipe.

[0013] It is common knowledge in this field that corresponding pump bodies and valves are configured on each level of pipelines according to the transportation requirements.

[0014] In any of the above schemes, it is preferred that the first alkali washing tank is filled with alkali washing solution, a reflux pipe is provided on the outside of the first alkali washing tank, the air outlet end of the reflux pipe is connected to the upper part of the first alkali washing tank, and the reflux end is connected to the lower part of the first alkali washing tank, and a one-way reflux solenoid valve is installed at the lower end of the reflux pipe.

[0015] In any of the above schemes, it is preferred that the second alkali washing device includes a second alkali washing tank, the air inlet of the second alkali washing tank is connected to the connecting pipe, the second alkali washing chamber of the second alkali washing tank is divided into a plurality of sealed alkali washing chambers by a plurality of sealed partitions fixedly installed in sequence from top to bottom, each of the sealed alkali washing chambers is filled with alkali washing solution, a one-way overflow upper discharge valve is installed in the center of the sealing partition at the top of each sealed alkali washing chamber, an air inlet connected to the connecting pipe is installed on one side of the lowest sealed alkali washing chamber, a secondary one-way one-way air inlet valve is arranged on the air inlet, an exhaust pipe is installed on the top of the second alkali washing tank, and an exhaust one-way valve is installed on the exhaust pipe.

[0016] In any of the above schemes, it is preferred that the opening pressure of each of the one-way overflow upper valves increases sequentially from bottom to top.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This system is mainly used for rapid cooling and multi-stage and multi-effect alkaline washing of high flue gas at the exhaust gas outlet of RTO thermal storage combustion equipment, so as to effectively further neutralize acidic substances through alkaline washing operation, completely remove acidic substances, and make the flue gas meet emission standards.

[0019] 2. The whole system can make efficient use of the heat of the high-temperature flue gas at the front end, and realize the circulation and multi-stage preheating of the exhaust gas to be burned in the RTO thermal storage combustion equipment through the heat exchange chamber, so as to ensure the rapid combustion after entering the combustion chamber of the RTO thermal storage combustion equipment, and improve the combustion efficiency and effect; preheating can better ensure the reuse of energy and save the heating cost of the RTO thermal storage combustion equipment during combustion.

[0020] 3. Through multi-stage alkaline washing operation, the acidic substances in the gas can be better removed, effectively ensuring the safety of exhaust emissions and meeting emission requirements and standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a schematic diagram of the internal structure of the heat exchange bin of the present invention.

[0024] In the figure, 1. flue gas anticorrosion pipeline; 2. cooling device; 3. first alkali washing device; 4. second alkali washing device; 5. RTO heat storage combustion equipment; 6. heat exchange chamber; 7. heat exchange guide pipe; 8. front hollow end cover; 9. rear hollow end cover; 10. heat storage outlet pipe; 11. gas outlet solenoid valve; 12. gas inlet pipe; 13. gas inlet solenoid valve; 14. external gas source; 15. transfer valve; 16. transfer capillary; 17. reciprocating piston; 18. reciprocating displacement electric cylinder; 19. cooling tank; 20. gas-liquid separator; 21. Circulating water pump; 22. Alkali washing tank; 23. First alkali washing chamber; 24. Spiral overflow pipe; 25. First-stage booster pump; 26. Jet air hole; 27. First-stage exhaust valve; 28. Second booster pump; 29. ​​Reflux pipe; 30. One-way reflux solenoid valve; 31. Second alkali washing tank; 32. Connecting pipe; 33. Second alkali washing chamber; 34. Sealed partition; 35. Sealed alkali washing chamber; 36. One-way overflow upper valve; 37. Second-stage one-way air inlet valve; 38. Exhaust pipe; 39. Exhaust one-way valve; 40. External cooling water source. DETAILED DESCRIPTION

[0025] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-2 as shown in .

[0026] Embodiment 1:

[0027] The RTO thermal storage combustion post-treatment system comprises a flue gas anti-corrosion pipeline 1 installed at the exhaust gas outlet end of the RTO thermal storage combustion equipment 5, the end of the flue gas anti-corrosion pipeline 1 is connected to an external exhaust gas collection system, and a cooling device 2, a first alkali washing device 3, and a second alkali washing device 4 are sequentially installed at the end of the flue gas anti-corrosion pipeline 1, the cooling device 2 is used to cool the high-temperature flue gas at the exhaust gas outlet end of the RTO thermal storage combustion equipment 5 and complete the preliminary treatment of the exhaust gas, the first alkali washing device 3 is arranged downstream of the cooling device 2 and is used to achieve a primary alkali washing of the cooled exhaust gas, and the second alkali washing device 4 is arranged downstream of the first alkali washing device 3 and achieves multi-stage recoil alkali washing of the cooled exhaust gas.

[0028] The high-temperature flue gas at the exhaust gas outlet end of the RTO heat storage combustion equipment 5 can be circulated and preheated along the flue gas anti-corrosion pipeline 1 in the heat exchange bin 6 to circulate and preheat other exhaust gases to be burned inside it. After the heat is utilized, the burned gas in the flue gas anti-corrosion pipeline 1 that continues to move forward will be cooled to a certain extent. After cooling, it enters the cooling device 2 for further cooling and light washing. The washed gas passes through the first alkali washing device 3 and the second alkali washing device 4 to complete multi-stage alkali washing operations to remove the internal acidic substances, and is finally discharged after meeting the standards.

[0029] In any of the above schemes, it is preferred that a heat exchange bin 6 is installed on the flue gas anti-corrosion pipeline 1 upstream of the cooling device 2, and a plurality of heat exchange guide pipes 7 are installed in the heat exchange bin 6, the air inlet end of each of the heat exchange guide pipes 7 is connected to the flue gas anti-corrosion pipeline 1 through a front hollow end cover 8, and the outlet end of each of the heat exchange guide pipes 7 is connected to the cooling device 2 through a rear hollow end cover 9, a heat storage outlet pipe 10 is installed at the bottom of the heat exchange bin 6, and an air outlet solenoid valve 11 is installed on the heat storage outlet pipe 10, and the end of the heat storage outlet pipe 10 is connected to the heat storage chamber of the RTO heat storage combustion equipment 5 through a pipeline, and a gas inlet pipe 12 is installed on the upper part of the heat exchange bin 6, and an air intake solenoid valve 13 is installed on the gas inlet pipe 12, and the air inlet end of the gas inlet pipe 12 is connected to an external gas source 14.

[0030] Before entering the cooling device 2, it first enters the heat exchange bin 6, and the single flow of gas is divided into multiple thin tube fluids through a plurality of heat exchange guide tubes 7 through the front hollow end cover 8. Since the heat exchange guide tube 7 is made of metal material with good thermal conductivity, the heat can be radiated to the gas entering the heat exchange bin 6 and waiting to enter the heat storage chamber of the RTO heat storage combustion equipment 5 for radiation heating, thereby achieving the purpose of heat utilization; the gas entering the heat exchange bin 6 may not reach the required temperature after a single auxiliary heating, so the following transfer thin tube 16 structure is adopted here, the main purpose of which is to achieve the purpose of multiple cycle heating and increase the gas preheating heat storage temperature.

[0031] In any of the above schemes, it is preferred that the cooling device 2 includes a cooling tank 19 installed at the outlet end of the rear hollow end cover 9, the interior of the cooling tank 19 is filled with water-washing coolant, and a gas-liquid separator 20 is installed at the top outlet end of the cooling tank 19, the gas outlet end of the gas-liquid separator 20 is connected to the first alkaline washing device 3, and the liquid outlet end of the gas-liquid separator 20 is connected back to the interior of the cooling tank 19.

[0032] In any of the above schemes, preferably, a circulating water pump 21 is installed on one side of the cooling tank 19 through a pipeline, and the circulating water pump 21 is used to continuously circulate water from the external cooling water source 40 in the cooling tank 19 and therebetween.

[0033] The circulating water pump 21 of the cooling device 2 can be turned on periodically, so as to continuously circulate the water-washing coolant inside the cooling tank 19 to the post-cooling, thereby ensuring the cooling effect of the cooling inside the cooling tank 19; the gas after water washing and cooling can be separated into gas and liquid by the gas-liquid separator 20, and the gas continues to enter the first alkaline washing device 3 for subsequent alkaline washing.

[0034] In any of the above schemes, it is preferred that the first alkali washing device 3 includes a first alkali washing tank 22 installed at the outlet end of the rear hollow end cover 9, a spiral overflow pipe 24 is installed in the first alkali washing chamber 23 of the first alkali washing tank 22, the upper inlet end of the spiral overflow pipe 24 is connected to the outlet end of the rear hollow end cover and a first-stage booster pump 25 is installed at its port, the end of the spiral overflow pipe 24 is sealed and a plurality of jet air holes 26 are provided on its outer side wall, the first-stage exhaust valve 27 at the top of the first alkali washing tank 22 is connected to the second alkali washing device 4 through a connecting pipe 32, and a second booster pump 28 is installed on the connecting pipe 32.

[0035] When the first alkali washing device 3 is working, it mainly enters the spiral overflow pipe 24 of the first alkali washing tank 22 through the outlet end of the rear hollow end cover 9. Due to the pressurization of the first-stage booster pump 25, the gas can enter the spiral overflow pipe 24 at a faster speed, and then contact with the alkali washing solution in the spiral overflow pipe 24 and flow out from the various jet air holes 26 on the spiral overflow pipe 24 to continue to carry out alkali washing neutralization reaction with the large amount of solution in the first alkali washing chamber 23, thereby effectively removing the internal acidic substances.

[0036] The spiral overflow pipe 24 provided here can fully ensure that the gas is ejected from the multiple jet holes 26, and can effectively improve the contact degree with the alkali washing solution in the first alkali washing chamber 23 in a multi-flow manner to ensure the effect of alkali washing.

[0037] It is common knowledge in this field that corresponding pump bodies and valves are configured on each level of pipelines according to the transportation requirements.

[0038] In any of the above schemes, it is preferred that the second alkali washing device 4 includes a second alkali washing tank 31, the air inlet of the second alkali washing tank 31 is connected to the connecting pipe 32, and the second alkali washing chamber 33 of the second alkali washing tank 31 is divided into a plurality of sealed alkali washing chambers 35 by a plurality of sealed partitions 34 fixedly installed in sequence from top to bottom, each of the sealed alkali washing chambers 35 is filled with alkali washing solution, and a one-way overflow upper valve 36 is installed at the center of the sealing partition 34 at the top of each of the sealed alkali washing chambers 35, an air inlet connected to the connecting pipe 32 is installed on one side of the lowest sealed alkali washing chamber 35, a secondary one-way air inlet valve 37 is arranged on the air inlet, and an exhaust pipe 38 is installed on the top of the second alkali washing tank 31, and an exhaust one-way valve 39 is installed on the exhaust pipe 38.

[0039] When the second alkali washing tank 31 is working, it mainly receives the gas that has undergone an alkali washing treatment from the upstream. After the gas enters the sealed alkali washing chamber 35 at the bottom, it will react with the internal alkali washing solution again, and the acidic substances therein will be further removed. When the gas rushing into the interior is sufficient, the current one-way overflow upper discharge valve 36 will be forced to open, so that it enters the upper sealed alkali washing chamber 35. This reciprocating process can achieve the purpose of multiple alkali washing, thereby effectively improving the effect and efficiency of alkali washing, reducing the content of acidic gas in the gas, and achieving maximum emission compliance.

[0040] Embodiment 2:

[0041] The RTO thermal storage combustion post-treatment system comprises a flue gas anti-corrosion pipeline 1 installed at the exhaust gas outlet end of the RTO thermal storage combustion equipment 5, the end of the flue gas anti-corrosion pipeline 1 is connected to an external exhaust gas collection system, and a cooling device 2, a first alkali washing device 3, and a second alkali washing device 4 are sequentially installed at the end of the flue gas anti-corrosion pipeline 1, the cooling device 2 is used to cool the high-temperature flue gas at the exhaust gas outlet end of the RTO thermal storage combustion equipment 5 and complete the preliminary treatment of the exhaust gas, the first alkali washing device 3 is arranged downstream of the cooling device 2 and is used to achieve a primary alkali washing of the cooled exhaust gas, and the second alkali washing device 4 is arranged downstream of the first alkali washing device 3 and achieves multi-stage recoil alkali washing of the cooled exhaust gas.

[0042] The high-temperature flue gas at the exhaust gas outlet end of the RTO heat storage combustion equipment 5 can be circulated and preheated along the flue gas anti-corrosion pipeline 1 in the heat exchange bin 6 to circulate and preheat other exhaust gases to be burned inside it. After the heat is utilized, the burned gas in the flue gas anti-corrosion pipeline 1 that continues to move forward will be cooled to a certain extent. After cooling, it enters the cooling device 2 for further cooling and light washing. The washed gas passes through the first alkali washing device 3 and the second alkali washing device 4 to complete multi-stage alkali washing operations to remove the internal acidic substances, and is finally discharged after meeting the standards.

[0043] In any of the above schemes, it is preferred that a heat exchange bin 6 is installed on the flue gas anti-corrosion pipeline 1 upstream of the cooling device 2, and a plurality of heat exchange guide pipes 7 are installed in the heat exchange bin 6, the air inlet end of each of the heat exchange guide pipes 7 is connected to the flue gas anti-corrosion pipeline 1 through a front hollow end cover 8, and the outlet end of each of the heat exchange guide pipes 7 is connected to the cooling device 2 through a rear hollow end cover 9, a heat storage outlet pipe 10 is installed at the bottom of the heat exchange bin 6, and an air outlet solenoid valve 11 is installed on the heat storage outlet pipe 10, and the end of the heat storage outlet pipe 10 is connected to the heat storage chamber of the RTO heat storage combustion equipment 5 through a pipeline, and a gas inlet pipe 12 is installed on the upper part of the heat exchange bin 6, and an air intake solenoid valve 13 is installed on the gas inlet pipe 12, and the air inlet end of the gas inlet pipe 12 is connected to an external gas source 14.

[0044] Before entering the cooling device 2, it first enters the heat exchange bin 6, and the single flow of gas is divided into multiple thin tube fluids through a plurality of heat exchange guide tubes 7 through the front hollow end cover 8. Since the heat exchange guide tube 7 is made of metal material with good thermal conductivity, the heat can be radiated to the gas entering the heat exchange bin 6 and waiting to enter the heat storage chamber of the RTO heat storage combustion equipment 5 for radiation heating, thereby achieving the purpose of heat utilization; the gas entering the heat exchange bin 6 may not reach the required temperature after a single auxiliary heating, so the following transfer thin tube 16 structure is adopted here, the main purpose of which is to achieve the purpose of multiple cycle heating and increase the gas preheating heat storage temperature.

[0045] In any of the above schemes, it is preferred that a transfer capillary 16 with a transfer valve 15 is installed above the heat exchange chamber 6, and both ends of the transfer capillary 16 are respectively connected to the interior of the heat exchange chamber 6. A reciprocating piston 17 is installed in the heat exchange chamber 6, and the reciprocating piston 17 is movable through the mounting holes thereon and is sealingly sleeved on the outer side walls of the corresponding heat exchange flow guide tubes 7. A corrosion-resistant reciprocating displacement electric cylinder 18 is installed at the center of the inner end surface of the front hollow end cover 8, and the front end of the piston rod of the corrosion-resistant reciprocating displacement electric cylinder 18 is connected to the reciprocating piston 17. The corrosion-resistant reciprocating displacement electric cylinder 18 cooperates with the reciprocating piston 17 to realize the left and right reciprocating transfer of the gas to be burned entering the heat exchange chamber 6 through reciprocating motion; a temperature sensor and a pressure sensor are installed on the heat exchange chamber 6, and the temperature sensor and the pressure sensor are connected to the external control system signal.

[0046] The gas entering the heat exchange bin 6 adopts a periodic intermittent introduction of a certain amount of gas, and then the gas entering needs to be controlled to be transferred to the left or right side of the reciprocating piston 17 along the transfer tube 16 under the action of the reciprocating displacement electric cylinder 18, so as to achieve the purpose of periodic transfer and maintain it inside the heat exchange bin 6, and finally achieve the purpose of sufficient radiation heat exchange with the high-temperature gas passing through the inside of each heat exchange flow guide tube 7 for a long time. The reciprocating transfer of the gas inside the heat exchange bin 6 can achieve the purpose of sufficient heat exchange, improve the temperature uniformity of the entire gas, and the gas heat exchange effect and uniformity in the flow state are better. The data of the temperature sensor and the pressure sensor can be collected through the existing external control system, so that it is convenient to observe the current air pressure and gas temperature inside the heat exchange bin 6. Trying to increase the temperature of the gas before entering the RTO thermal storage combustion equipment 5 can better ensure the fullness and rapidity of the gas in the later combustion, and preheating the gas achieves the purpose of saving energy.

[0047] In any of the above schemes, it is preferred that the cooling device 2 includes a cooling tank 19 installed at the outlet end of the rear hollow end cover 9, the interior of the cooling tank 19 is filled with water-washing coolant, and a gas-liquid separator 20 is installed at the top outlet end of the cooling tank 19, the gas outlet end of the gas-liquid separator 20 is connected to the first alkaline washing device 3, and the liquid outlet end of the gas-liquid separator 20 is connected back to the interior of the cooling tank 19.

[0048] In any of the above schemes, preferably, a circulating water pump 21 is installed on one side of the cooling tank 19 through a pipeline, and the circulating water pump 21 is used to continuously circulate water from an external cooling water source in the cooling tank 19 and therebetween.

[0049] The circulating water pump 21 of the cooling device 2 can be turned on periodically, so as to continuously circulate the water-washing coolant inside the cooling tank 19 to the post-cooling, thereby ensuring the cooling effect of the cooling inside the cooling tank 19; the gas after water washing and cooling can be separated into gas and liquid by the gas-liquid separator 20, and the gas continues to enter the first alkaline washing device 3 for subsequent alkaline washing.

[0050] In any of the above schemes, it is preferred that the first alkali washing device 3 includes a first alkali washing tank 22 installed at the outlet end of the rear hollow end cover 9, a spiral overflow pipe 24 is installed in the first alkali washing chamber 23 of the first alkali washing tank 22, the upper inlet end of the spiral overflow pipe 24 is connected to the outlet end of the rear hollow end cover 9 and a first-stage booster pump 25 is installed at its port, the end of the spiral overflow pipe 24 is sealed and a plurality of jet air holes 26 are provided on its outer side wall, the first-stage exhaust valve 27 at the top of the first alkali washing tank 22 is connected to the second alkali washing device 4 through a connecting pipe 32, and a second booster pump 28 is installed on the connecting pipe 32.

[0051] When the first alkali washing device 3 is working, it mainly enters the spiral overflow pipe 24 of the first alkali washing tank 22 through the outlet end of the rear hollow end cover 9. Due to the pressurization of the first-stage booster pump 25, the gas can enter the spiral overflow pipe 24 at a faster speed, and then contact with the alkali washing solution in the spiral overflow pipe 24 and flow out from the various jet air holes 26 on the spiral overflow pipe 24 to continue to carry out alkali washing neutralization reaction with the large amount of solution in the first alkali washing chamber 23, thereby effectively removing the internal acidic substances.

[0052] The spiral overflow pipe 24 provided here can fully ensure that the gas is ejected from the multiple jet holes 26, and can effectively improve the contact degree with the alkali washing solution in the first alkali washing chamber 23 in a multi-flow manner to ensure the effect of alkali washing.

[0053] It is common knowledge in this field that corresponding pump bodies and valves are configured on each level of pipelines according to the transportation requirements.

[0054] In any of the above schemes, it is preferred that the first alkali washing tank 22 is filled with an alkali washing solution, and a reflux pipe 29 is provided on the outside of the first alkali washing tank 22, the air outlet end of the reflux pipe 29 is connected to the upper part of the first alkali washing tank 22, and the reflux end is connected to the lower part of the first alkali washing tank 22, and a one-way reflux solenoid valve 30 is installed at the lower end of the reflux pipe 29.

[0055] The reflux pipe 29 installed on the first alkali washing tank 22 can circulate the gas after alkali washing, so as to achieve the purpose of re-circulating alkali washing and improve the effect of the first-level alkali washing.

[0056] After multiple cycles, the one-way reflux solenoid valve 30 can be closed and the first-stage exhaust valve 27 can be opened to transport gas downstream.

[0057] In any of the above schemes, it is preferred that the second alkali washing device 4 includes a second alkali washing tank 31, the air inlet of the second alkali washing tank 31 is connected to the connecting pipe 32, and the second alkali washing chamber 33 of the second alkali washing tank 31 is divided into a plurality of sealed alkali washing chambers 35 by a plurality of sealed partitions 34 fixedly installed in sequence from top to bottom, each of the sealed alkali washing chambers 35 is filled with alkali washing solution, and a one-way overflow upper valve 36 is installed at the center of the sealing partition 34 at the top of each of the sealed alkali washing chambers 35, an air inlet connected to the connecting pipe 32 is installed on one side of the lowest sealed alkali washing chamber 35, a secondary one-way air inlet valve 37 is arranged on the air inlet, and an exhaust pipe 38 is installed on the top of the second alkali washing tank 31, and an exhaust one-way valve 39 is installed on the exhaust pipe 38.

[0058] When the second alkali washing tank 31 is working, it mainly receives the gas that has undergone an alkali washing treatment from the upstream. After the gas enters the sealed alkali washing chamber 35 at the bottom, it will react with the internal alkali washing solution again, and the acidic substances therein will be further removed. When the gas rushing into the interior is sufficient, the current one-way overflow upper discharge valve 36 will be forced to open, so that it enters the upper sealed alkali washing chamber 35. This reciprocating process can achieve the purpose of multiple alkali washing, thereby effectively improving the effect and efficiency of alkali washing, reducing the content of acidic gas in the gas, and achieving maximum emission compliance.

[0059] In any of the above solutions, it is preferred that the opening pressure of each of the one-way overflow upper valves 36 increases sequentially from bottom to top.

[0060] The opening pressure of each one-way overflow upper discharge valve 36 increases from bottom to top to ensure that the alkaline cleaning solution and the incoming gas can fully contact and react at a higher pressure as they go up, thereby gradually improving the alkaline cleaning effect.

[0061] Specific working principle:

[0062] The high-temperature flue gas at the exhaust gas outlet end of the RTO heat storage combustion equipment 5 can be circulated and preheated along the flue gas anti-corrosion pipeline 1 in the heat exchange bin 6 to circulate and preheat other exhaust gases to be burned inside it. After the heat is utilized, the burned gas in the flue gas anti-corrosion pipeline 1 that continues to move forward will be cooled to a certain extent. After cooling, it enters the cooling device 2 for further cooling and light washing. The washed gas passes through the first alkali washing device 3 and the second alkali washing device 4 to complete multi-stage alkali washing operations to remove the internal acidic substances, and is finally discharged after meeting the standards. Before entering the cooling device 2, it first enters the heat exchange bin 6, and the single flow of gas is divided into multiple thin tube fluids through a plurality of heat exchange guide tubes 7 through the front hollow end cover 8. Since the heat exchange guide tube 7 is made of metal material with good thermal conductivity, the heat can be radiated to the gas entering the heat exchange bin 6 and waiting to enter the heat storage chamber of the RTO heat storage combustion equipment 5 for radiation heating, thereby achieving the purpose of heat utilization; the gas entering the heat exchange bin 6 may not reach the required temperature after a single auxiliary heating, so the following transfer thin tube 16 structure is adopted here, the main purpose of which is to achieve the purpose of multiple cycle heating and increase the gas preheating heat storage temperature. When the first alkali washing device 3 is working, it mainly enters the spiral overflow pipe 24 of the first alkali washing tank 22 through the outlet end of the rear hollow end cover 9. Due to the pressurization of the first-stage booster pump 25, the gas can enter the spiral overflow pipe 24 at a faster speed, and then contact with the alkali washing solution in the spiral overflow pipe 24 and flow out from the various jet air holes 26 on the spiral overflow pipe 24 to continue to carry out alkali washing neutralization reaction with the large amount of solution in the first alkali washing chamber 23, thereby effectively removing the internal acidic substances. When the second alkali washing tank 31 is working, it mainly receives the gas that has undergone an alkali washing treatment from the upstream. After the gas enters the sealed alkali washing chamber 35 at the bottom, it will react with the internal alkali washing solution again, and the acidic substances therein will be further removed. When the gas rushing into the interior is sufficient, the current one-way overflow upper discharge valve 36 will be forced to open, so that it enters the upper sealed alkali washing chamber 35. This reciprocating process can achieve the purpose of multiple alkali washing, thereby effectively improving the effect and efficiency of alkali washing, reducing the content of acidic gas in the gas, and achieving maximum emission compliance.

[0063] The above 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 with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. For those skilled in the art, any replacement, improvement or change made to the implementation mode of the present invention falls within the protection scope of the present invention.

[0064] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. RTO thermal storage combustion post-treatment system, characterized by: It comprises a flue gas anti-corrosion pipeline installed at the exhaust gas outlet of the RTO thermal storage combustion equipment, the end of the flue gas anti-corrosion pipeline is connected to the external exhaust gas collection system, and a cooling device, a first alkali washing device, and a second alkali washing device are sequentially installed at the end of the flue gas anti-corrosion pipeline, the cooling device is used to cool the high-temperature flue gas at the exhaust gas outlet of the RTO thermal storage combustion equipment and complete the preliminary treatment of the exhaust gas, the first alkali washing device is arranged downstream of the cooling device and is used to achieve a primary alkali washing of the cooled exhaust gas, and the second alkali washing device is arranged downstream of the first alkali washing device and achieves multi-stage recoil alkali washing of the cooled exhaust gas; A heat exchange bin is installed on the flue gas anti-corrosion pipeline upstream of the cooling device, and a plurality of heat exchange guide pipes are installed in the heat exchange bin. The air inlet end of each of the heat exchange guide pipes is connected to the flue gas anti-corrosion pipeline through a front hollow end cover, and the outlet end of each of the heat exchange guide pipes is connected to the cooling device through a rear hollow end cover. A heat storage outlet pipe is installed at the bottom of the heat exchange bin, and an air outlet solenoid valve is installed on the heat storage outlet pipe. The end of the heat storage outlet pipe is connected to the heat storage chamber of the RTO heat storage combustion equipment through a pipeline. A gas inlet pipe is installed on the upper part of the heat exchange bin, and an air intake solenoid valve is installed on the gas inlet pipe. The air inlet end of the gas inlet pipe is connected to an external air source. A transfer capillary with a transfer valve is installed above the heat exchange bin, and both ends of the transfer capillary are respectively connected to the inside of the heat exchange bin, and a reciprocating piston is installed in the heat exchange bin, and the reciprocating piston is respectively movable through the mounting holes thereon and sealedly sleeved on the outer side walls of the corresponding heat exchange flow guide tubes, and a corrosion-resistant reciprocating displacement electric cylinder is installed at the center of the inner end surface of the front hollow end cover, and the front end of the piston rod of the corrosion-resistant reciprocating displacement electric cylinder is connected to the reciprocating piston, and the corrosion-resistant reciprocating displacement electric cylinder cooperates with the reciprocating piston to realize the left and right reciprocating transfer of the gas to be burned entering the heat exchange bin through reciprocating motion; a temperature sensor and a pressure sensor are installed on the heat exchange bin, and the temperature sensor and the pressure sensor are connected to the external control system signal; The cooling device comprises a cooling tank installed at the outlet end of the rear hollow end cover, the cooling tank is filled with water-washing coolant, a gas-liquid separator is installed at the outlet end of the top of the cooling tank, the gas outlet end of the gas-liquid separator is connected to the first alkali washing device, and the liquid outlet end of the gas-liquid separator is back-connected to the inside of the cooling tank; A circulating water pump is installed on one side of the cooling tank through a pipeline, and the circulating water pump is used to continuously circulate water from an external cooling water source in the cooling tank and between the cooling tank.

2. The RTO thermal storage combustion post-treatment system according to claim 1, characterized in that: The first alkali washing device includes a first alkali washing tank installed at the outlet end of the rear hollow end cover, a spiral overflow pipe is installed in the first alkali washing chamber of the first alkali washing tank, the upper inlet end of the spiral overflow pipe is connected to the outlet end of the hollow end cover and a first-stage booster pump is installed at its port, the end of the spiral overflow pipe is sealed and a plurality of jet air holes are provided on its outer side wall, the first-stage exhaust valve at the top of the first alkali washing tank is connected to the second alkali washing device through a connecting pipe, and a second booster pump is installed on the connecting pipe.

3. The RTO thermal storage combustion after-treatment system according to claim 2 is characterized in that: The first alkali cleaning tank is filled with alkali cleaning solution, and a reflux pipe is provided on the outside of the first alkali cleaning tank. The air outlet end of the reflux pipe is connected to the upper part of the first alkali cleaning tank, and the reflux end is connected to the lower part of the first alkali cleaning tank. A one-way reflux solenoid valve is installed at the lower end of the reflux pipe.

4. The RTO thermal storage combustion post-treatment system according to claim 3 is characterized in that: The second alkali washing device comprises a second alkali washing tank, the air inlet of the second alkali washing tank is connected to the connecting pipe, the second alkali washing chamber of the second alkali washing tank is divided into a plurality of sealed alkali washing chambers by a plurality of sealed partitions fixedly installed in sequence from top to bottom, each of the sealed alkali washing chambers is filled with alkali washing solution, a one-way overflow upper discharge valve is installed at the center of the sealing partition at the top of each of the sealed alkali washing chambers, an air inlet connected to the connecting pipe is installed on one side of the lowest sealed alkali washing chamber, a secondary one-way one-way air inlet valve is arranged on the air inlet, an exhaust pipe is installed on the top of the second alkali washing tank, and an exhaust one-way valve is installed on the exhaust pipe.

5. The RTO thermal storage combustion after-treatment system according to claim 4 is characterized in that: The opening pressure of each one-way overflow upper valve increases from bottom to top.

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