Acetylene gas treatment system suitable for calcium carbide method sodium hypochlorite purification process wastewater

Abstract

The utility model discloses an acetylene gas treatment system suitable for calcium carbide method sodium hypochlorite purification process wastewater. The acetylene gas treatment system comprises an acetylene gas collection unit, an acetylene gas treatment unit and a tail end spraying and discharging unit, particularly, aiming at the condition that acetylene gas in calcium carbide process sodium hypochlorite purification process wastewater contains part of halogenated hydrocarbon, the system adopts a three-bed heat storage oxidation combustion and chemical washing process, and a series of automatic control programs are set, so that the stability of gas inlet quantity can be ensured to the greatest extent, the fan energy consumption and fuel consumption are reduced, and the energy consumption is reduced to the greatest extent. The tail gas containing hydrogen chloride after being treated by the RTO incineration equipment enters the alkaline washing tower to be treated, and after hydrogen chloride in the tail gas is removed through the alkaline washing tower, the tail gas reaches the standard and is discharged, so that obvious environmental benefits and social benefits are brought to enterprises, and meanwhile, the advanced concepts of low carbon, environmental protection, energy conservation and emission reduction at present are met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to waste gas treatment recovery device technical field, concretely relates to a kind of acetylene gas disposal system suitable for calcium carbide method secondary sodium purification process wastewater. BACKGROUND

[0002] In the production process of calcium carbide method acetylene purification process, the crude acetylene gas containing sulfur, phosphorus and other impurities sent from the process is cooled and cooled, pressurized, and then the sodium hypochlorite solution is used to remove sulfur, phosphorus and other impurities. This process produces a large amount of wastewater containing saturated acetylene gas. Reasonably and effectively recycling the wastewater and waste gas of the purification system has become a current technical problem. The recycling of secondary sodium wastewater and waste gas is mainly through a negative pressure desorption system. Based on the condition of negative pressure, the solubility of acetylene gas in secondary sodium wastewater is reduced, so that acetylene gas is released from the liquid phase. Using the principle of gas partial pressure, by reducing the system pressure, breaking the original gas-liquid equilibrium, promoting acetylene gas molecules to escape from the solution, the separated acetylene gas is recycled to the production process. The secondary sodium wastewater discharged from the bottom of the desorption tower has a significantly reduced acetylene gas content. A part of it is compounded with fresh sodium hypochlorite for use in the purification tower, and the other part is adjusted in pH value before being treated further. The wastewater is pumped to a phosphorus removal device for phosphorus removal to meet the discharge standard or recycling requirement.

[0003] Currently, there are problems in the treatment of waste gas in secondary sodium wastewater. According to the "Control Standard for Volatile Organic Compounds Unorganized Emission" (GB 37822-2019), enterprises in key areas should implement special control requirements for unorganized emission. During the process of unorganized emission investigation and rectification, enterprises should strengthen the closed management of VOCs materials in all aspects, all chains and all links under the premise of safety. The main source of VOCs in the existing production link is the escaped waste gas from the open pool, recovery tank and stripping tower of the secondary sodium wastewater follow-up treatment system. Based on the improvement of the further treatment space for this waste gas, a disposal device for acetylene gas in calcium carbide method secondary sodium purification process wastewater is designed to further improve the collection and treatment efficiency of VOCs waste gas, reduce pollutant emissions and reduce enterprise waste gas emissions, thereby meeting the needs of environmental safety improvement for enterprises and laying a solid foundation for the rapid development of enterprises. SUMMARY

[0004] The utility model aims to solve the problem of further improving the treatment of escaped waste gas in the acetylene secondary sodium wastewater follow-up treatment system, and provides a disposal system for acetylene gas in calcium carbide method secondary sodium purification process wastewater, which further improves the collection and treatment efficiency of VOCs waste gas, reduces pollutant emissions and reduces enterprise waste gas emissions, thereby meeting the needs of environmental safety improvement for enterprises and laying a solid foundation for the rapid development of enterprises.

[0005] In order to achieve the above purpose of the utility model, the following technical scheme is adopted:

[0006] An acetylene gas disposal system suitable for calcium carbide method secondary sodium purification process wastewater, comprising sequentially connected acetylene gas collection unit, acetylene gas treatment unit and terminal spray discharge unit; the acetylene gas collection unit comprises a tail gas collection hood and a tail gas regulating valve connected in sequence through a tail gas pipe, and the tail gas pipe is connected to a tail gas main pipe, and the tail gas main pipe is connected to the inlet of an RTO fan;

[0007] The acetylene gas treatment unit comprises a waste gas main pipe pressure gauge, a concentration dilution air pipe, a waste gas main pipe concentration detector, an emergency emptying pipe, a waste gas main pipe cut-off valve, a fresh air pipe, an inlet flame arrester, an RTO fan, an RTO incineration device and a mixing tank connected in sequence; the upper part of the RTO incineration device is provided with a burner, a hearth thermometer, a top pressure gauge, a top bursting disc and a high-temperature emptying pipe, the high-temperature emptying pipe is provided with a high-temperature emptying valve connected to the mixing tank, the burner is connected to a combustion air fan and a fuel tank through pipelines respectively, the RTO incineration device is filled with heat storage materials and is provided with a middle layer thermometer, the RTO incineration device is A, B and C three beds, the lower part of the A bed is connected to an air inlet pipe I provided with an air inlet valve I, a purge pipe I provided with a purge valve I and an air outlet pipe I provided with an air outlet valve I, the lower part of the B bed is connected to an air inlet pipe II provided with an air inlet valve II, a purge pipe II provided with a purge valve II and an air outlet pipe II provided with an air outlet valve II, and the lower part of the C bed is connected to an air inlet pipe III provided with an air inlet valve III, a purge pipe III provided with a purge valve III and an air outlet pipe III provided with an air outlet valve III, the air outlet pipe I, the air outlet pipe II and the air outlet pipe III are connected to an air outlet main pipe connected to the mixing tank, the outlet of the mixing tank is connected to a caustic washing tower, and the purge pipe I, the purge pipe II and the purge pipe III are connected to a purge main pipe provided with a circulating purge valve and connected to the tail gas main pipe;

[0008] The terminal spray discharge unit comprises a caustic washing tower, a circulating pump and a discharge facility, the top outlet pipe of the caustic washing tower is connected to the discharge facility, and the tail gas main pipe is connected to the discharge facility through an emergency emptying pipe provided with an emergency emptying valve.

[0009] Further, the acetylene gas collection unit can be multiple tail gas collection sources, the first source is a secondary sodium purification process wastewater treatment tail gas, a wastewater treatment collection hood arranged on a wastewater treatment tank is connected to a wastewater treatment tail gas pipe provided with a wastewater treatment tail gas regulating valve, and finally connected to a tail gas main pipe; the second source is a blow-off recovery tank, a blow-off recovery sealing hood installed on the blow-off recovery tank is connected to a blow-off recovery tail gas pipe provided with a blow-off recovery tail gas regulating valve, and finally connected to the tail gas main pipe, and the tail gas main pipe is provided with a pipeline bursting disc at the end.

[0010] Further, the concentration dilution air pipe inlet is provided with a concentration dilution air filter, and the concentration dilution air pipe is provided with a concentration dilution air valve which is electrically connected to the exhaust gas main pipe concentration detector to automatically adjust the opening degree.

[0011] Further, the alkali washing tower is connected to a process water pipeline provided with a process water cut-off valve and an alkali adding pipeline provided with an alkali cut-off valve in the middle part, the other end of the alkali adding pipeline is connected to an alkali high tank, and the bottom outlet pipe of the alkali washing tower is connected to a circulating pump to deliver the circulating liquid to the upper part of the alkali washing tower for spraying circulation, the outlet pipe of the circulating pump is connected to a detection circuit provided with a pH meter and a discharge circuit provided with a discharge cut-off valve, and the exhaust gas main pipe is connected to the lower part of the washing tower through a backflow pipe to ensure a certain height difference to make the liquid in the exhaust gas main pipe backflow to the alkali washing tower.

[0012] Further, the combustion air fan is provided with a combustion air filter at the inlet and a combustion air valve at the outlet connected to the burner, and the fuel tank bottom outlet is connected to the burner through a fuel pump, a fuel valve and a fuel flow meter.

[0013] Preferably, the RTO burning equipment is usually three beds, and the heat storage material is regular ceramic or scattered ceramic.

[0014] Preferably, the wastewater treatment collecting cover, the wastewater treatment exhaust pipe, the stripping recovery sealing cover, the stripping recovery exhaust pipe, the alkali washing tower and the discharge facility are made of glass steel material and are resistant to halogen corrosion.

[0015] Further, the RTO fan and the combustion air fan are explosion-proof variable frequency fans, the exhaust gas main pipe concentration detector, the exhaust gas main pipe cut-off valve, the RTO fan, the furnace temperature meter, the top pressure gauge, the high-temperature emptying valve, the combustion air fan, the middle layer temperature meter, the air inlet valve I, the air inlet valve II, the air inlet valve III, the purge valve I, the purge valve II, the purge valve III, the air outlet valve I, the air outlet valve II, the air outlet valve III, the circulating purge valve, the concentration dilution air valve, the fresh air valve, the process water cut-off valve, the alkali cut-off valve, the circulating pump, the pH meter, the combustion air valve, the fuel pump, the fuel valve and the fuel flow meter are electrically connected to the control system to read and control the current operating state of each device.

[0016] Further, a system suitable for disposing of acetylene gas in the secondary sodium cleaning process wastewater by the calcium carbide method includes the following automatic control:

[0017] 1) The exhaust gas main pipe pressure gauge and the RTO fan opening frequency are single-loop controlled: the exhaust gas main pipe pressure gauge and the RTO fan opening frequency are single-loop controlled, the air inlet amount of the RTO burning equipment is automatically controlled by the exhaust gas main pipe pressure and the RTO fan opening frequency, the air inlet amount is ensured to be stable, and the fan energy consumption is reduced.

[0018] 2) Concentration dilution air valve, fresh air valve and exhaust gas concentration value of main pipe single loop control: Concentration dilution air valve automatically adjusts opening degree according to exhaust gas main pipe concentration detector display value (two options), two exhaust gas main pipe concentration detectors meet 6% below 30S, then close concentration dilution air valve, when two exhaust gas main pipe concentration detectors reach 8%~9%, fresh air valve opening degree is 20%; When two exhaust gas main pipe concentration detectors reach 10%~11%, fresh air valve opening degree is 40%; When two exhaust gas main pipe concentration detectors reach 12%~13%, fresh air valve opening degree is 60%; When two exhaust gas main pipe concentration detectors reach 14%~15%, fresh air valve opening degree is 80%; When two exhaust gas main pipe concentration detectors reach more than 16%, fresh air valve opening degree is 100%.

[0019] 3) Fresh air valve and RTO incineration equipment upper part set furnace temperature, high temperature exhaust valve single loop control: When RTO incineration equipment furnace temperature is higher than preset temperature, control fresh air valve and high temperature exhaust valve opening degree gradually increases, its opening degree is positively correlated with temperature value, through fresh air dilution and high temperature exhaust to reduce RTO incineration equipment furnace temperature.

[0020] 4) Combustion burner start-stop signal and fuel valve opening degree single loop control: During system operation, fuel valve opening degree is negatively correlated with furnace temperature, when RTO incineration equipment furnace temperature reaches set temperature, fuel valve is closed; When temperature decreases below set temperature, fuel valve is opened, fuel supply is controlled according to combustion burner proportional valve.

[0021] 5) RTO incineration equipment program control valve automatic switching: RTO incineration equipment lower part gas inlet pipe, purge pipe and gas outlet pipe respectively gas inlet valve, purge valve and gas outlet valve, automatically switch according to set time sequence.

[0022] 6) Alkaline washing tower liquid level meter and process water cut-off valve, lye cut-off valve single loop control, alkaline washing tower circulating liquid PH meter and lye cut-off valve single loop control: When alkaline washing tower liquid level reaches set low liquid level value, automatically open process water cut-off valve and lye cut-off valve, when alkaline washing tower liquid level reaches set high liquid level value, automatically close process water cut-off valve and lye cut-off valve; Alkaline washing tower circulating liquid PH meter pH value is controlled in a certain range, when pH value is below set value, open lye cut-off valve to add lye, when alkaline washing tower liquid level reaches high liquid level value, even if alkaline washing tower circulating liquid PH meter pH value is not in PH set value, also automatically close lye cut-off valve.

[0023] The utility model discloses an advantageous effect is: compared with prior art, the utility model provides a kind of acetylene gas disposal system suitable for calcium carbide method secondary sodium purification process wastewater, by acetylene gas collection unit can collect multiple tail gas collection sources, each collection source sets up independent control valve and is controlled separately, incorporate or cut out system at any time, do not affect waste gas main pressure;A series of automatic control procedures are set, can guarantee the gas intake amount stability to the maximum extent, reduce fan energy consumption and fuel consumption, waste gas treatment reaches unorganized emission special control requirement;Especially for acetylene gas containing part halogenated hydrocarbon in calcium carbide method secondary sodium purification process wastewater, the system uses three beds heat accumulation oxidation combustion and chemical scrubbing process front-end waste gas collection and is sent into RTO after heat oxidation and forms carbon dioxide and water, simultaneously, the heat generated by heat oxidation can reduce the auxiliary fuel consumption of system, when reaching certain concentration, the heat released by heat oxidation can satisfy the operating requirement of RTO itself, when RTO inlet concentration exceeds equilibrium concentration, system will exist surplus heat, surplus heat is directly discharged through high-temperature valve and is gathered after RTO outlet waste gas and is discharged, after the treatment of RTO incineration equipment, hydrogen chloride is contained in tail gas, enters lye washing tower processing, and after removing hydrogen chloride in tail gas by lye washing tower, it is discharged with standard, bring obvious environmental benefit and social benefit for enterprise, simultaneously, meet current low-carbon environmental protection, energy saving and emission reduction advanced concept. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure schematic diagram of the utility model.

[0025] In the figure: 1. waste water treatment collection cover, 2. waste water treatment tail gas adjusting valve, 3. waste water treatment tail gas pipe, 4. stripping recovery sealing cover, 5. stripping recovery tail gas adjusting valve, 6. stripping recovery tail gas pipe, 7. tail gas main pipe, 8. exhaust gas main pipe pressure gauge, 9. exhaust gas main pipe concentration detector, 10. concentration dilution air filter, 11. concentration dilution air valve, 12. concentration dilution air pipe, 13. fresh air filter, 14. fresh air valve, 15. fresh air pipe, 16. exhaust gas main pipe cut-off valve, 17. inlet flame arrester, 18. RTO fan, 19. emergency emptying pipe, 20. emergency emptying valve, 21. RTO incineration equipment, 22. purging circulation valve, 23. caustic washing tower, 23a. inlet valve I, 23b. inlet valve II, 23c. inlet valve III, 24a. inlet pipe I, 24b. inlet pipe II, 24c. inlet pipe III, 25a. purging valve I, 25b. purging valve II, 25c. purging valve III, 26a. purging pipe I, 26b. purging pipe II, 26c. purging pipe III, 27a. outlet valve I, 27b. outlet valve II, 27c. outlet valve III, 28a. outlet pipe I, 28b. outlet pipe II, 28c. outlet pipe III, 24. middle layer thermometer, 25. circulation purging valve, 26. purging main pipe, 27. pipe burst disc, 28. outlet main pipe, 29. high temperature emptying pipe, 30. high temperature emptying valve, 31. lye head tank, 32. lye cut-off valve, 33. process water cut-off valve, 34. caustic washing tower top outlet pipe, 35. discharge facility, 36. pH meter, 37. discharge cut-off valve, 38. return pipe, 39. circulation pump, 40. top pressure gauge, 41. burner, 42. hearth thermometer, 43. combustion air fan, 44. combustion air filter, 45. fuel valve, 46. fuel flow meter, 47. fuel pump, 48. fuel tank, 49. top burst disc, 50. combustion air valve. DETAILED DESCRIPTION

[0026] In order for those skilled in the art to more clearly understand the technical scheme of the present application, the following will be explained and described in the manner of examples. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings from these drawings without creating any creative labor. EMBODIMENT

[0027] Referring to Figure 1 As shown in the figure, an acetylene gas disposal system suitable for calcium carbide method secondary sodium purification process waste water, comprising acetylene gas collection unit, acetylene gas treatment unit and end spray discharge unit connected in sequence; the acetylene gas collection unit comprises tail gas collection cover and tail gas adjusting valve connected in sequence through tail gas pipe, the tail gas pipe is connected to tail gas main pipe 7 in a collective manner, and the tail gas main pipe 7 is connected to the inlet of RTO fan 18;

[0028] The acetylene gas treatment unit comprises, in sequence, a waste gas main pressure gauge 8, a concentration dilution air pipe 12, a waste gas main concentration detector 9, an emergency emptying pipe 19, a waste gas main shut-off valve 16, a fresh air pipe 15, an inlet flame arrester 17, an RTO fan 18, an RTO incineration device 21, and a mixing tank 22; the RTO incineration device 21 is provided with a burner 41, a hearth temperature gauge 42, a top pressure gauge 40, a top burst disc 49, and a high-temperature emptying pipe 29, the high-temperature emptying pipe 29 is provided with a high-temperature emptying valve 30 connected to the mixing tank 22, the burner 41 is connected to a combustion-supporting fan 43 and a fuel tank 48 through pipes respectively, the RTO incineration device 21 is filled with heat storage materials and is provided with a middle layer temperature gauge 24, the RTO incineration device is A, B, and C three beds, the A bed is connected to an air inlet pipe I 24a provided with an air inlet valve I 23a at the lower part, a purge pipe I 26a provided with a purge valve I 25a, and an air outlet pipe I 28a provided with an air outlet valve I 27a, the B bed is connected to an air inlet pipe II 24b provided with an air inlet valve II 23b at the lower part, a purge pipe II 26b provided with a purge valve II 25b, and an air outlet pipe II 28b provided with an air outlet valve II 27b, the C bed is connected to an air inlet pipe III 24c provided with an air inlet valve III 23c at the lower part, a purge pipe III 26c provided with a purge valve III 25c, and an air outlet pipe III 28c provided with an air outlet valve III 27c, the air outlet pipes I 28a, II 28b, and III 28c are connected to an air outlet main pipe 28 connected to the mixing tank 22, the mixing tank 22 is connected to a caustic washing tower 23 at the outlet, and the purge pipes I 26a, II 26b, and III 26c are connected to a purge main pipe 26 provided with a circulating purge valve 25 and connected to a tail gas main pipe 7.

[0029] The end spray discharge unit comprises the caustic washing tower 23, a circulating pump 39, and a discharge facility 35, the caustic washing tower is connected to the discharge facility 35 at the top outlet pipe 34, and the tail gas main pipe is connected to the discharge facility 35 through the emergency emptying pipe 19 provided with an emergency emptying valve 20.

[0030] Further, the acetylene gas collection unit can be multiple tail gas collection sources, a first source is a secondary sodium cleaning process wastewater treatment tail gas, a wastewater treatment collection hood 1 arranged on a wastewater treatment tank is connected to a wastewater treatment tail gas pipe 3 provided with a wastewater treatment tail gas regulating valve 2, and finally connected to a tail gas main pipe 7, a second source is a blow-off recovery tank, a blow-off recovery sealing hood 4 arranged on the blow-off recovery tank is connected to a blow-off recovery tail gas pipe 6 provided with a blow-off recovery tail gas regulating valve 5, and finally connected to the tail gas main pipe 7, and the tail gas main pipe 7 is provided with a pipe burst disc 27 at the end.

[0031] Further, the concentration dilution air pipe 12 is provided with a concentration dilution air filter 10 at the inlet, and the concentration dilution air valve 11 on the concentration dilution air pipe 12 is electrically connected to the exhaust gas main pipe concentration detector 9 on the exhaust gas main pipe to automatically adjust the opening degree; the fresh air pipe 15 is provided with a fresh air filter 13 at the inlet, and the fresh air valve 14 on the fresh air pipe is respectively electrically connected to the furnace thermometer 42 and the high-temperature emptying valve 30 provided on the upper part of the RTO incineration equipment.

[0032] Further, the caustic washing tower is connected with a process water pipeline provided with a process water cut-off valve 33 and an alkali adding pipeline provided with an alkali cut-off valve 32, the other end of the alkali adding pipeline is connected with an alkali high tank 31, the bottom outlet pipe of the caustic washing tower is connected with a circulating pump 39 to deliver the circulating liquid to the upper part of the caustic washing tower for spraying circulation, the outlet pipe of the circulating pump is connected with a detection loop provided with a pH meter 36 and a discharge loop provided with a discharge cut-off valve 37, and the top outlet pipe 34 of the caustic washing tower is connected to the lower part of the washing tower through a backflow pipe 38 to ensure a certain height difference to make the liquid in the top outlet pipe 34 of the caustic washing tower backflow to the caustic washing tower 23.

[0033] Further, the combustion air fan 43 is provided with a combustion air filter 44 at the inlet and a combustion air valve 50 at the outlet connected to the burner 41, and the bottom outlet of the fuel tank 48 is connected to the burner 41 through a fuel pump 47, a fuel valve 45 and a fuel flow meter 46.

[0034] Further, the heat storage material in the RTO incineration equipment is regular ceramic or bulk ceramic.

[0035] Further, the wastewater treatment collecting cover 1, the wastewater treatment exhaust gas pipe 2, the stripping recovery sealing cover 4, the stripping recovery exhaust gas pipe 6, the caustic washing tower 23 and the discharge facility 35 are made of glass steel material and are resistant to halogen corrosion.

[0036] Further, the RTO fan 18 and the combustion air fan 43 are both anti-explosion variable frequency fans; the exhaust gas main pipe concentration detector 9, the exhaust gas main pipe cut-off valve 16, the RTO fan 18, the furnace thermometer 42, the top pressure gauge 40, the high-temperature emptying valve 30, the combustion air fan 43, the middle layer thermometer 24, the intake valve I 23a, the intake valve II 23b, the intake valve III 23c, the purge valve I 25a, the purge valve II 25b, the purge valve III 25c, the outlet valve I 27a, the outlet valve II 27b, the outlet valve III 27c, the circulating purge valve 25, the concentration dilution air valve 11, the fresh air valve 14, the process water cut-off valve 33, the alkali cut-off valve 32, the circulating pump 39, the pH meter 36, the combustion air valve 50, the fuel pump 47, the fuel valve 45 and the fuel flow meter 46 are electrically connected to the control system to be able to read and control the current operating state of each equipment.

[0037] A system for disposing acetylene gas in calcium carbide method secondary sodium purification process wastewater, comprising the following automatic control:

[0038] 1) The exhaust manifold pressure gauge 8 and the RTO fan 18 opening frequency are single-loop controlled: the exhaust manifold pressure and the RTO fan opening frequency are automatically controlled to ensure stable air intake and reduce fan energy consumption.

[0039] 2) Concentration dilution air valve 11, fresh air valve 14 and exhaust manifold concentration value single-loop control: the concentration dilution air valve 11 automatically adjusts the opening degree according to the display value of the exhaust manifold concentration detector 9 (two options), and the two exhaust manifold concentration detectors 9 are closed after meeting the 6% below for 30S, and the fresh air valve 14 is opened at 20% when the concentration of either of the two exhaust manifold concentration detectors 9 reaches 8% to 9%, at 40% when the concentration reaches 10% to 11%, at 60% when the concentration reaches 12% to 13%, at 80% when the concentration reaches 14% to 15%, and at 100% when the concentration of either of the two exhaust manifold concentration detectors 9 reaches more than 16%.

[0040] 3) The fresh air valve 14 and the high-temperature exhaust valve 30 set at the upper part of the RTO incineration equipment 21 are single-loop controlled: when the furnace temperature of the RTO incineration equipment is higher than the preset temperature, the opening degree of the fresh air valve 14 and the high-temperature exhaust valve 30 is gradually increased, and the opening degree is positively correlated with the temperature value, and the furnace temperature in the RTO incineration equipment is reduced by fresh air dilution and high-temperature exhaust;

[0041] 4) The start-stop signal of the burner 41 and the opening degree of the fuel valve 45 are single-loop controlled: during system operation, the opening degree of the fuel valve 45 is negatively correlated with the furnace temperature, and when the furnace temperature of the RTO incineration equipment reaches the set temperature, the fuel valve 45 is closed; when the temperature decreases below the set temperature, the fuel valve 45 is opened, and the fuel supply is controlled by the burner proportional valve;

[0042] 5) RTO incineration equipment program-controlled valve automatic switching: the lower inlet pipe, purge pipe and outlet pipe of the RTO incineration equipment respectively have inlet valve, purge valve and outlet valve, which are automatically switched according to the set time sequence. During normal operation, one inlet, one purge and one outlet are switched by valves to complete the cycle of heat storage and heat release of the regenerative bed, and finally the organic waste gas treated by the RTO incineration equipment meets the emission standard.

[0043] 6) the alkali washing tower liquid level meter and the process water cut-off valve, the alkali liquid cut-off valve single loop control, the alkali washing tower circulating liquid PH meter and the alkali liquid cut-off valve single loop control: when the alkali washing tower liquid level reaches the set low liquid level value, automatically open the process water cut-off valve, alkali liquid cut-off valve, when the alkali washing tower liquid level reaches the set high liquid level value, automatically close the process water cut-off valve, alkali liquid cut-off valve: the alkali washing tower circulating liquid PH meter pH value control in a certain range, pH value is lower than the set value, open the alkali liquid cut-off valve to supplement alkali liquid, the alkali washing tower liquid level reaches the high liquid level value, even if the alkali washing tower circulating liquid PH meter pH value is not in the PH set value, also automatically close the alkali liquid cut-off valve.

[0044] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art within the technical range disclosed by the present application, according to the technical scheme and the utility model concept of the present application, equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A system for treating acetylene gas in wastewater from the sodium hypochlorite purification process using the calcium carbide method, characterized in that: It includes an acetylene gas collection unit, an acetylene gas treatment unit, and a terminal spray emission unit connected in sequence; the acetylene gas collection unit includes a tail gas collection hood and a tail gas regulating valve connected in sequence through tail gas pipes, the tail gas pipes are connected to the tail gas main pipe, and the tail gas main pipe is connected to the RTO fan inlet. The acetylene gas treatment unit includes, in sequence, a main exhaust gas manifold pressure gauge, a concentration dilution duct, a main exhaust gas manifold concentration detector, an emergency vent pipe, a main exhaust gas shut-off valve, a fresh air duct, an inlet flame arrester, an RTO fan, an RTO incineration unit, and a mixing tank. The upper part of the RTO incineration unit is equipped with a burner, a furnace thermometer, a top pressure gauge, a top rupture disc, and a high-temperature vent pipe. The high-temperature vent pipe is connected to the mixing tank via a high-temperature vent valve. The burner is connected to the combustion fan and fuel tank via pipes. The RTO incineration unit is filled with heat storage material and equipped with a middle-layer thermometer. The RTO incineration unit has three beds: A, B, and C. Bed A is connected to the lower part of an inlet pipe I with an inlet valve I, a purge pipe I with a purge valve I, and an outlet pipe I with an outlet valve I. Bed B is connected to the lower part of an inlet pipe II with an inlet valve II, a purge pipe II with a purge valve II, and an outlet pipe II with an outlet valve II. Bed C is connected to the lower part of an inlet pipe III with an inlet valve III, a purge pipe III with a purge valve III, and an outlet pipe III with an outlet valve III. The outlet pipes I, II, and III converge into a main outlet pipe that connects to a mixing tank. The outlet of the mixing tank is connected to an alkaline washing tower. The purge pipes I, II, and III converge into a main purge pipe equipped with a circulating purge valve that connects to the tail gas main pipe. The terminal spray emission unit includes an alkaline scrubbing tower, a circulating pump, and emission facilities. The top outlet pipe of the alkaline scrubbing tower is connected to the emission facilities, and the exhaust gas main pipe is connected to the emission facilities through an emergency venting pipe equipped with an emergency venting valve.

2. The acetylene gas treatment system for wastewater from the sodium hypochlorite purification process according to claim 1, characterized in that, The acetylene gas collection unit can collect multiple exhaust gas sources. The first source is the exhaust gas from the sodium hypochlorite purification process wastewater treatment. The wastewater treatment collection hood installed on the wastewater treatment pond is connected to the wastewater treatment exhaust gas pipe equipped with a wastewater treatment exhaust gas regulating valve, and finally converges to the exhaust gas main pipe. The second source is the stripping and recovery tank. The stripping and recovery sealing cover installed on the stripping and recovery tank is connected to the stripping and recovery exhaust gas pipe equipped with a stripping and recovery exhaust gas regulating valve, and finally converges to the exhaust gas main pipe. The exhaust gas main pipe is equipped with a pipe rupture disc at the end.

3. The acetylene gas treatment system for wastewater from the sodium hypochlorite purification process according to claim 1, characterized in that, A concentration dilution air filter is installed at the inlet of the concentration dilution air duct, and a concentration dilution air valve is installed on the concentration dilution air duct and electrically connected to the exhaust gas main pipe concentration detector installed on the exhaust gas main pipe to automatically adjust the opening degree; a fresh air filter is installed at the inlet of the fresh air duct, and a fresh air valve installed on the fresh air duct is electrically connected to the furnace thermometer and high-temperature vent valve installed on the upper part of the RTO incineration equipment.

4. The acetylene gas treatment system for wastewater from the sodium hypochlorite purification process according to claim 1, characterized in that, The middle part of the alkaline washing tower is connected to a process water pipeline equipped with a process water shut-off valve and an alkali addition pipeline equipped with an alkali solution shut-off valve. The other end of the alkali addition pipeline is connected to an alkali solution high-level tank. The bottom outlet pipe of the alkaline washing tower is connected to a circulation pump to transport the circulating liquid to the upper part of the alkaline washing tower for spray circulation. The outlet pipe of the circulation pump is connected to a detection circuit equipped with a pH meter and a discharge circuit equipped with a discharge shut-off valve. The tail gas main pipe is connected to the lower part of the washing tower through a return pipe to ensure a certain height difference so that the liquid in the tail gas main pipe flows back to the alkaline washing tower.

5. The acetylene gas treatment system for wastewater from the sodium hypochlorite purification process according to claim 1, characterized in that, The combustion air blower is equipped with a combustion air filter at its inlet and a combustion air valve at its outlet, which is connected to the burner. The bottom outlet of the fuel tank is connected to the burner via a fuel pump, a fuel valve, and a fuel flow meter.

6. The acetylene gas treatment system for wastewater from the sodium hypochlorite purification process according to claim 1, characterized in that, The RTO incineration equipment is a three-bed system, and the heat storage material is either structured ceramic or random-pile ceramic.

7. The acetylene gas treatment system for wastewater from the sodium hypochlorite purification process according to claim 1, characterized in that, The wastewater treatment collection hood, wastewater treatment tail gas pipe, stripping and recovery sealing hood, stripping and recovery tail gas pipe, alkaline washing tower and discharge facilities are made of fiberglass, which is resistant to halogen corrosion.

8. The acetylene gas treatment system for wastewater from the sodium hypochlorite purification process according to claim 1, characterized in that, The RTO fan and combustion fan are both explosion-proof variable frequency fans. The exhaust gas main pipe concentration detector, exhaust gas main pipe shut-off valve, RTO fan, furnace thermometer, top pressure gauge, high temperature vent valve, combustion fan, middle layer thermometer, inlet valve I, inlet valve II, inlet valve III, purge valve I, purge valve II, purge valve III, outlet valve I, outlet valve II, outlet valve III, circulating purge valve, concentration dilution air valve, fresh air valve, process water shut-off valve, alkali shut-off valve, circulating pump, pH meter, combustion air valve, fuel pump, fuel valve, and fuel flow meter are electrically connected to the control system, which can read and control the current operating status of each device.

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