Method for treating high-concentration organic waste gas in pharmaceutical industry

Abstract

According to the method for treating the high-concentration organic waste gas in the pharmaceutical industry, a combined direct catalytic oxidation mode is adopted, and condensation at the temperature of 5 DEG C below zero, condensation at the temperature of 15 DEG C below zero, buffering of a buffer tank, heat exchange of heat exchange equipment, CO catalytic oxidation, air cooling of an air cooler and bypass activated carbon adsorption are sequentially carried out; and a front-end LEL detector II is arranged, and when the concentration detected by the front-end LEL detector II is ultrahigh, the activated carbon bypass module is switched to perform bypass emergency treatment.

Description

Technical Field

[0001] The invention relates to environmental protection technology, and in particular to waste gas treatment, and specifically to a method for treating high-concentration organic waste gas in the pharmaceutical industry. Background Art

[0002] Although the organic waste gas volume discharged by the vacuum pump of the reactor in the traditional Chinese medicine pharmaceutical workshop is small, the concentration is very high and it is very difficult to treat. Taking the waste gas of the vacuum pump in a traditional Chinese medicine pharmaceutical workshop as an example, the main components of the gas are petroleum ether and ethyl acetate, and the maximum concentration can reach 190g / m 3 above.

[0003] At present, the following problems need to be solved urgently for the treatment of this high-concentration waste gas:

[0004] 1) Conventional activated carbon adsorption process has poor activated carbon regeneration effect, frequent replacement, high operating cost, and easy emission exceeding the standard, while increasing the cost of activated carbon hazardous waste disposal;

[0005] 2) The effect of the scrubber absorption process is poor, the waste gas is basically insoluble in water, and the emission exceeds the standard;

[0006] 3) The deep condensation process has a high investment and cannot be used as a standard treatment, but only as a pretreatment measure;

[0007] 4) The treatment device is generally located in an explosion-proof area, and the use of open flame incineration processes such as RTO is not applicable, and the RTO incineration process is not applicable when the air volume is small;

[0008] In view of this situation, there is an urgent need for a waste gas treatment method with advanced technology, simple equipment, no secondary pollution, high impact load resistance, safety and reliability.

[0009] Therefore, it is necessary to provide a method for treating high-concentration organic waste gas in the pharmaceutical industry to solve the above problems. Summary of the invention

[0010] The purpose of the present invention is to provide a method for treating high-concentration organic waste gas in the pharmaceutical industry.

[0011] A method for treating high-concentration organic waste gas in the pharmaceutical industry adopts a combined direct catalytic oxidation method, and sequentially performs -5°C condensation, -15°C condensation, buffer tank buffering, heat exchange equipment heat exchange, CO catalytic oxidation, air cooling by an air cooler, and bypass activated carbon adsorption; the specific steps include:

[0012] 1) After the exhaust gas is collected, it enters the condenser 1 for condensation. The refrigerant uses -5℃ condensed chilled water for heat exchange to condense the supersaturated exhaust gas. The temperature after condensation is displayed by thermocouple 1;

[0013] 2) After condensation in condenser 1, the exhaust gas enters the second stage condenser 2 for further condensation. -15℃ chilled water is used for heat exchange and cooling. The exhaust gas concentration after deep cooling is 18000mg / m 3 , the temperature after condensation is displayed by thermocouple 24;

[0014] 3) Further, the condensed exhaust gas enters the buffer tank 1 after passing through the flame arrester, and a pneumatic dilution air valve is set on the buffer tank 1 to dilute the exhaust gas to less than 25% of the lower explosion limit. The lower explosion limit of hexane in the exhaust gas is at least 25% of 1%, that is, 9598 mg / m 3 , so the exhaust gas needs to be diluted to below this value;

[0015] 4) The diluted exhaust gas is mixed evenly through the mixer and then enters the buffer tank 2 to stabilize the exhaust gas pressure and reduce the impact load;

[0016] 5) After the pressure is stabilized and the impact load is reduced, the exhaust gas is heated by the heat exchanger and then enters the CO catalytic oxidation furnace for catalytic oxidation;

[0017] 6) After catalytic oxidation, the exhaust gas passes through the heat exchanger for heat exchange and cooling, then enters the air cooler for further cooling, and finally passes through the exhaust pipe to meet the emission standards;

[0018] 7) A front-end LEL detector 2 is set corresponding to the exhaust pipe. When the concentration detected by the front-end LEL detector 2 is too high, it switches to the activated carbon bypass module for bypass emergency treatment.

[0019] Furthermore, the air volume is 300m 3 / h, concentration is 30000mg / m 3 The waste gas mainly comes from the tail gas of the vacuum pump. The main pollutants in the waste gas are ethyl acetate, pentane, hexane organic gases and a small amount of water vapor.

[0020] Furthermore, in step 3), the maximum dilution factor of the pneumatic dilution air valve is 10 times, that is, the air volume is 3000m 3 / h for design.

[0021] Furthermore, the activated carbon bypass module is composed of a pneumatic air valve 3, an activated carbon adsorption device, and a bypass air blower.

[0022] Furthermore, in step 6), the cold air of the air cooler is powered by a cooling fan.

[0023] Furthermore, step 5) specifically includes: a catalytic oxidation preheating stage, a catalytic oxidation startup stage, and a catalytic combustion normal working stage.

[0024] Furthermore, the catalytic oxidation preheating stage is specifically as follows;

[0025] 5-1-1) Once the pneumatic air valve is closed, the pneumatic dilution air valve is opened and the main fan runs at a low frequency;

[0026] 5-1-2) After the main fan and valves are started normally, the electric heater will start 1 minute later to preheat the system.

[0027] Furthermore, the catalytic oxidation startup stage is specifically as follows;

[0028] 5-2-1) The exhaust gas temperature thermocouple 4 in the CO catalytic oxidation furnace is increased to the exhaust gas ignition temperature of 300°C;

[0029] 5-2-2) Once the pneumatic air valve is opened, the pneumatic dilution air valve is closed to introduce the exhaust gas, and the main fan frequency is adjusted in conjunction with the intake pressure transmitter.

[0030] Furthermore, the normal working stage of catalytic combustion specifically includes:

[0031] 5-3-1) The organic waste gas enters the heat exchanger to exchange heat for the waste gas, and the heat exchange temperature directly reaches 270°C;

[0032] 5-3-2) After heat exchange, the organic waste gas enters the electric heater, and the waste gas temperature is heated to the ignition temperature of 300°C. The electric heater is controlled by thermocouple 4. When the temperature of the organic waste gas reaches the ignition temperature, the electric heater stops working;

[0033] 5-3-3) The organic waste gas heated to the ignition temperature enters the catalyst bed and is catalytically oxidized under the action of the catalyst. The organic matter in the waste gas is oxidized and decomposed into CO2 and H2O. The temperature of thermocouple 5 and thermocouple 6 is observed. When the temperature of thermocouple 6 exceeds 450℃, the pneumatic dilution air valve is activated to control the temperature in the furnace.

[0034] 5-3-4) The purified high-temperature gas enters the plate heat exchanger for heat exchange with the low-temperature organic waste gas. The gas temperature after heat exchange is 80°C and is cooled to 40°C by the air cooler.

[0035] Further, when the inlet temperature of the CO catalytic oxidation furnace is lower than the ignition temperature, the electric heater starts; when the inlet temperature of the CO catalytic oxidation furnace 16 is higher than the ignition temperature, the electric heater stops working;

[0036] When the temperature of the thermocouple 6 at the outlet of the CO catalytic oxidation furnace is higher than 450℃, the pneumatic dilution air valve opens to add fresh air to reduce the concentration of organic matter in the intake air. When the temperature enters the normal range, the pneumatic dilution air valve closes.

[0037] If the temperature in the catalyst bed exceeds 500°C, the equipment will automatically alarm;

[0038] If the temperature of thermocouple 6 in the catalytic combustion equipment exceeds 550°C, it can be switched to the bypass activated carbon adsorption device for emergency treatment.

[0039] The fan adopts explosion-proof equipment at the throat, adopts frequency conversion control, protection level IP55, insulation level F;

[0040] The pipe is made of SUS304 material and is equipped with static electricity span to avoid the harm of static electricity;

[0041] A two-stage LEL concentration detector is set at the air inlet, and is linked with the pneumatic dilution air valve and bypass system. When the concentration of LEL detector 1 reaches the PLC setting value, the pneumatic dilution air valve opens to dilute the exhaust gas concentration; when the concentration of LEL detector 2 reaches the PLC setting value, the bypass system opens to prevent the exhaust gas concentration entering the CO catalytic oxidation furnace from exceeding the lower explosion limit of 25%;

[0042] The CO catalytic oxidation furnace has an overheating protection function;

[0043] Flame arresters are installed in front of buffer tank 1 and buffer tank 2 to prevent system backfire from damaging production equipment after a fire occurs;

[0044] The oxidation reaction in the CO catalytic oxidation furnace is a flameless oxidation reaction, and there is no open flame;

[0045] Multiple thermocouples are set in the CO catalytic oxidation furnace to monitor the internal temperature to ensure that the temperature is controlled within the normal operating range;

[0046] An explosion vent is set inside the CO catalytic oxidation furnace, and an explosion vent plate is installed to cope with explosion and pressure relief in extreme uncontrollable situations;

[0047] A pressure transmitter is installed at the air inlet, and the fan controls the air volume according to the pressure transmitter to ensure that the exhaust gas treatment operates within the set negative pressure value;

[0048] After power failure, the pneumatic air valve 3 automatically returns to normally open, and the pneumatic air valve 2 of the catalytic oxidation furnace automatically returns to normally closed, and the exhaust gas is not introduced into the CO catalytic oxidation furnace 16, ensuring that the internal heat will not overflow and damage the subsequent equipment;

[0049] The electric control system is equipped with PLC and touch screen to realize internal interlocking and automatic control operation.

[0050] Compared with the prior art, the present invention increases the recovery value of waste gas condensation and improves the waste gas treatment efficiency, thereby improving the depth and breadth of high-concentration waste gas treatment; the treatment efficiency is high, and the treatment equipment has a compact structure, a small footprint, is easy to manufacture and install, and is quick to operate, maintain and manage, with no safety hazards; no secondary pollution is generated, and zero sewage discharge is achieved; a buffer tank is provided with a large impact load resistance, and corresponding safety measures are set along the way, so that the system operates safely and reliably; the amount of solvent recovery is increased, which effectively reduces the operating burden of the enterprise and achieves a two-way improvement in environmental protection and economic benefits; except for a small amount of electricity bills, there is basically no other energy consumption; the degree of automation is high, and one-button start and stop can be achieved, and the automatic operation is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural schematic diagram of the present invention.

[0052] Figure 2 This is a graph showing the change in outlet concentration at different catalytic oxidation temperatures.

[0053] Figure 3 This is a comparison chart of the processing efficiency of the new and old processes.

[0054] Figure 4 This is an analysis chart of the processing efficiency of each level of the new process.

[0055] Figure 5 This is a comparison chart of the operating costs of the new and old processes. DETAILED DESCRIPTION

[0056] Example

[0057] See also Figure 1 This embodiment shows an exhaust gas treatment system using a combined direct catalytic oxidation process. The specific process is: -5°C condensation, -15°C condensation, buffer tank buffering, heat exchange, CO catalytic oxidation, air cooling, and bypass activated carbon adsorption process for treatment.

[0058] Handling air volume is 300m 3 / h, concentration is 30000mg / m 3 , waste gas, waste gas mainly comes from vacuum pump tail gas. The main pollutants in the waste gas are organic gases such as ethyl acetate, pentane, hexane and a small amount of water vapor.

[0059] After being collected, the waste gas first enters the condenser 1 for condensation. The refrigerant uses -5℃ condensed chilled water for heat exchange to condense the supersaturated waste gas. The condensed temperature is displayed by thermocouple 2. Then it enters the second-stage condenser 23 for further condensation. -15℃ chilled water is used for heat exchange and cooling. Theoretically, the concentration after deep cooling is expected to be 18000mg / m 3 , the temperature after condensation is displayed by thermocouple 24.

[0060] Since the lowest explosion limit of hexane in several waste gas substances is 25% of 1%, that is, 9598 mg / m 3 The condensed waste gas passes through the flame arrester 5 and enters the buffer tank 9. A pneumatic dilution air valve 6 is set on the tank to dilute the waste gas to less than 25% of the lower limit of the explosion limit. The maximum dilution ratio can reach 10 times, that is, the air volume is 3000m 3 / h for design.

[0061] The exhaust gas is mixed evenly by the mixer 10 and then enters the buffer tank 12 for stabilizing the pressure of the exhaust gas and reducing the impact load. Finally, it is heated by the heat exchanger 14 and then enters the CO catalytic oxidation furnace 16 for catalytic oxidation. The purified gas is cooled by the heat exchanger 14 and then enters the air cooler 23 for cooling and then is discharged through the exhaust pipe 28 to meet the standards. The cold air of the air cooler is powered by the cooling fan 24.

[0062] A front-end LEL detector 2 11 is correspondingly provided. When the front-end LEL detector 2 11 detects an excessively high concentration, the system switches to the activated carbon bypass system for bypass emergency treatment. The bypass system is composed of a pneumatic air valve 3 29, an activated carbon adsorption device 30, a bypass fan 31 and other equipment.

[0063] Catalytic oxidation includes the following stages;

[0064] Catalytic oxidation preheating stage;

[0065] ① The pneumatic air valve 9 is closed, the pneumatic dilution air valve 6 is opened, and the main fan 26 runs at a low frequency;

[0066] ② After the main fan 26 and each valve are started normally, the electric heater 17 is started with a delay of 1 minute and the system is preheated.

[0067] Catalytic oxidation start-up phase;

[0068] ① Wait until the exhaust gas temperature thermocouple 4 18 in the CO catalytic oxidation furnace 16 is raised to the exhaust gas ignition temperature of about 300°C;

[0069] ② The pneumatic air valve 9 is opened and the pneumatic dilution air valve 6 is closed to introduce the exhaust gas into the treatment system. The frequency of the main fan 26 is adjusted in conjunction with the intake pressure transmitter 7.

[0070] Normal working stage of catalytic combustion;

[0071] ① The organic waste gas enters the heat exchanger 14 to exchange heat for the waste gas, and the heat exchange temperature directly reaches 270°C;

[0072] ② After heat exchange, the organic waste gas enters the electric heater 17, and the waste gas temperature is heated to the ignition temperature of about 300°C. The electric heater 17 is controlled by the thermocouple 4 18. When the temperature of the organic waste gas reaches the ignition temperature, the electric heater 17 stops working;

[0073] ③ The organic waste gas heated to the ignition temperature enters the catalytic bed and is catalytically oxidized under the action of the catalyst 21. The organic matter in the waste gas is oxidized and decomposed into CO2 and H2O. At the same time, the temperature of the thermocouple 5 19 and the thermocouple 6 20 is observed. When the temperature of the thermocouple 6 20 exceeds 450°C, the pneumatic dilution air valve 6 is started to control the temperature in the furnace.

[0074] ④ The purified high-temperature gas enters the plate heat exchanger 14 to exchange heat with the low-temperature organic waste gas. The gas temperature after heat exchange is about 80°C, and is cooled to about 40°C by the air cooler 23 and enters the exhaust pipe 28 to meet the emission standards.

[0075] The actual temperature at the heat exchange outlet of each stage shall be based on the catalyst bed reaction outlet temperature, outside air temperature and operating conditions.

[0076] Other working states are also included;

[0077] ① When the inlet temperature of the CO catalytic oxidation furnace 16 is lower than the ignition temperature, the electric heater 17 starts; when the inlet temperature of the CO catalytic oxidation furnace 16 is higher than the ignition temperature, the electric heater 17 stops working.

[0078] ② When the temperature of the thermocouple 6 20 at the outlet of the CO catalytic oxidation furnace 16 is higher than 450°C (adjustable), the pneumatic dilution air valve 6 is opened to add fresh air to reduce the concentration of organic matter in the intake air. When the temperature enters the normal range, the pneumatic dilution air valve 6 is closed.

[0079] ③When the temperature inside the catalyst bed exceeds 500℃, the equipment will automatically alarm.

[0080] ④ When the thermocouple 620 temperature of the catalytic combustion equipment exceeds 550℃ or the intake air concentration exceeds the standard and cannot be reduced, it can be switched to the bypass activated carbon adsorption device for emergency treatment.

[0081] Important safety measures:

[0082] (1) Explosion-proof design: The fan adopts explosion-proof equipment at the throat, adopts frequency conversion control, protection level IP55, insulation level F;

[0083] (2) The pipeline is made of SUS304 material and is equipped with an electrostatic span to avoid the harm of static electricity;

[0084] (3) A two-stage LEL concentration detector is installed at the air inlet, and is linked with the pneumatic dilution air valve 6 and the bypass system. When the concentration of the LEL detector 8 reaches the PLC setting value, the pneumatic dilution air valve 6 opens to dilute the exhaust gas concentration. When the concentration of the LEL detector 12 reaches the PLC setting value, the bypass system is opened to prevent the exhaust gas concentration entering the CO catalytic oxidation furnace 16 from exceeding the lower explosion limit of 25%;

[0085] (4) The CO catalytic oxidation furnace 16 has an overheat protection function;

[0086] (5) A flame arrester 5 is provided in front of the buffer tank 10 to prevent the system from backfire and damaging the production equipment after a fire occurs;

[0087] (6) An activated carbon adsorption bypass system is provided between the main pipeline and the CO catalytic oxidation furnace 16. It is used to cut off the passage between the intake air and the CO catalytic oxidation furnace 16 in an emergency;

[0088] (7) The oxidation reaction in the CO catalytic oxidation furnace 16 is a flameless oxidation reaction, and there is no open flame;

[0089] (8) Multiple thermocouples are provided in the CO catalytic oxidation furnace 16 to monitor the internal temperature and ensure that the temperature is controlled within the normal operating range;

[0090] (9) An explosion vent is provided in the CO catalytic oxidation furnace 16, and an explosion vent plate is installed to cope with explosion venting and pressure relief in extreme uncontrollable situations;

[0091] (10) A pressure transmitter 7 is installed at the air inlet of the system, and the fan controls the air volume according to the pressure transmitter 7 to ensure that the system operates within the set negative pressure value;

[0092] (11) After power failure, the pneumatic air valve 3 29 automatically returns to normally open, and the pneumatic air valve 2 13 of the catalytic oxidation furnace automatically returns to normally closed, and the exhaust gas is not introduced into the CO catalytic oxidation furnace 16, ensuring that the internal heat will not overflow and damage the subsequent equipment;

[0093] (12) The electronic control system is equipped with PLC and touch screen to realize internal interlocking and automatic control operation.

[0094] in;

[0095] If the catalytic temperature is too high or too low, it will affect the activity of the metal catalyst, causing incomplete oxidation of the exhaust gas and failing to ensure the treatment efficiency of the organic exhaust gas. When the organic exhaust gas undergoes oxidation reaction, it will emit a lot of heat, causing the temperature in the catalytic furnace to rise. Therefore, it is necessary to select a suitable catalytic oxidation temperature to ensure the smooth operation of the system.

[0096] Changes in outlet concentration at different catalytic oxidation temperatures, see Figure 2 In this embodiment, the outlet emission concentration is lower than 60 mg / m3 The oxidation temperature can reach the treatment target at above 260℃. At the same time, with the increase of combustion temperature, the exhaust gas concentration at the outlet shows a downward trend. When the highest temperature tested is 330℃, the exhaust gas concentration at the outlet is only 6mg / m 3 From the perspective of energy conservation, this project can achieve both economical and energy-saving as well as better processing efficiency by controlling the oxidation temperature at 280°C.

[0097] This embodiment is recorded as a new process and compared with the original processing process;

[0098] The FID online detector was used to compare the original treatment process and the new process for non-methane total hydrocarbon detection. The detection results are shown in Figure 2 ;

[0099] The average treatment efficiency of the original treatment process is only about 85%, while the treatment efficiency of the new process of this project can reach more than 99.9% after four quarters of operation, which can ensure that the system can stably meet emission standards. This shows that the new process has considerable advanced advantages and does not produce secondary pollution, and is very suitable for this type of waste gas.

[0100] Comparison of the efficiency of the original treatment process and the new process, see Figure 3 ;

[0101] This solution can treat more than 70% of the exhaust gas through two-stage condensation at -5℃ and -15℃, and can treat 98-99% of the exhaust gas through catalytic oxidation. The comprehensive treatment efficiency reaches more than 99.9%, and the exhaust gas concentration is stable at 20m / m 3 The process not only recycles a large amount of organic solvents, but also recovers 20,000L of organic solvents each year, greatly improving economic benefits, effectively reducing the operating burden of enterprises, and achieving a two-way improvement in environmental protection and economic benefits. It also reduces the impact load of waste gas, and controls the waste gas concentration within a safe range, ensuring the final treatment effect of catalytic oxidation.

[0102] For a comparison of the daily operating costs of the original treatment process and the new treatment process, see Figure 4 ;

[0103] The new process requires electric heating to provide part of the heat source, which consumes relatively more electricity, but the cost of consumables and system maintenance is much lower than that of the old process. The total operating cost is 1.3883 million yuan for the old process and 790,000 yuan for the new process, saving 598,300 yuan in total operating costs. The adoption of the new process has greatly reduced operating costs, further reduced the operating burden of the enterprise, and achieved a two-way improvement in environmental protection and economic benefits.

[0104] In summary, from the perspectives of operation effect and operation cost, it can be seen that the use of this project process has greatly improved the treatment efficiency, ensured the stable and standard operation of waste gas, and greatly reduced the operation cost, and also increased the recycling value, reducing the operation burden for enterprises from multiple angles. The most important thing is that the combined process has a high degree of automation and can be used at any time, which can meet various production conditions, and the final treatment index is far lower than the current emission standard requirements.

[0105] Compared with the prior art, the present invention increases the recovery value of waste gas condensation, improves the waste gas treatment efficiency, and improves the depth and breadth of high-concentration waste gas treatment; the treatment efficiency is high, and the treatment equipment has a compact structure, a small footprint, is easy to manufacture and install, and is quick to operate, maintain and manage, with no safety hazards; no secondary pollution is generated, and zero sewage discharge is achieved; a buffer tank is provided with a large impact load resistance, and corresponding safety measures are set along the way, so that the system operates safely and reliably; the solvent recovery volume is increased, which effectively reduces the enterprise's operating burden and achieves a two-way improvement in environmental protection and economic benefits; except for a small amount of electricity bills, there is basically no other energy consumption; the degree of automation is high, and one-button start and stop can be achieved, and automatic operation is stable.

[0106] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for treating high-concentration organic waste gas in the pharmaceutical industry, characterized by: A combined direct catalytic oxidation method is used, which sequentially performs -5℃ condensation, -15℃ condensation, buffer tank buffering, heat exchange equipment heat exchange, CO catalytic oxidation, air cooling by air cooler, and bypass activated carbon adsorption; the specific steps include: 1) After the exhaust gas is collected, it enters the condenser 1 for condensation. The refrigerant uses -5℃ condensed chilled water for heat exchange to condense the supersaturated exhaust gas. The temperature after condensation is displayed by thermocouple 1; 2) After condensation in condenser 1, the exhaust gas enters the second stage condenser 2 for further condensation. -15℃ chilled water is used for heat exchange and cooling. The exhaust gas concentration after deep cooling is 18000mg / m 3 , the temperature after condensation is displayed by thermocouple 24; 3) After further condensation, the exhaust gas passes through the flame arrester and enters the buffer tank 1, and a pneumatic dilution air valve is set on the buffer tank 1 to dilute the exhaust gas to less than 25% of the lower explosion limit. The lower explosion limit of hexane in the exhaust gas is 25% of 1%, that is, 9598 mg / m 3 , so the exhaust gas needs to be diluted to below this value; 4) The diluted exhaust gas is mixed evenly through the mixer and then enters the buffer tank 2 to stabilize the exhaust gas pressure and reduce the impact load; 5) After the pressure is stabilized and the impact load is reduced, the exhaust gas is heated by the heat exchanger and then enters the CO catalytic oxidation furnace for catalytic oxidation; 6) After catalytic oxidation, the exhaust gas passes through the heat exchanger for heat exchange and cooling, then enters the air cooler for further cooling, and finally passes through the exhaust pipe to meet the emission standards; 7) A front-end LEL detector 2 is set corresponding to the exhaust pipe. When the concentration detected by the front-end LEL detector 2 is too high, it switches to the activated carbon bypass module for bypass emergency treatment.

2. A method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 1, characterized in that: Handling air volume is 300m 3 / h, concentration is 30000mg / m 3 The waste gas mainly comes from the tail gas of the vacuum pump. The main pollutants in the waste gas are ethyl acetate, pentane, hexane organic gases and a small amount of water vapor.

3. The method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 1, characterized in that: In step 3), the maximum dilution factor of the pneumatic dilution air valve is 10 times, that is, the air volume is 3000m 3 / h for design.

4. A method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 2 or 3, characterized in that: The activated carbon bypass module consists of a pneumatic air valve, an activated carbon adsorption device and a bypass air blower.

5. A method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 4, characterized in that: In step 6), the cold air of the air cooler is powered by a cooling fan.

6. A method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 5, characterized in that: Step 5) specifically includes: a catalytic oxidation preheating stage, a catalytic oxidation startup stage, and a catalytic combustion normal working stage.

7. A method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 6, characterized in that: The catalytic oxidation preheating stage is specifically as follows; 5-1-1) Once the pneumatic air valve is closed, the pneumatic dilution air valve is opened and the main fan runs at a low frequency; 5-1-2) After the main fan and valves are started normally, the electric heater will start after a delay of 1 minute to preheat the system.

8. The method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 7, characterized in that: The catalytic oxidation startup stage is specifically as follows; 5-2-1) The exhaust gas temperature thermocouple 4 in the CO catalytic oxidation furnace is increased to the exhaust gas ignition temperature of 300°C; 5-2-2) Once the pneumatic air valve is opened, the pneumatic dilution air valve is closed to introduce the exhaust gas, and the main fan frequency is adjusted in conjunction with the intake pressure transmitter.

9. A method for treating high-concentration organic waste gas in the pharmaceutical industry according to claim 8, characterized in that: The normal working stage of catalytic combustion specifically includes: 5-3-1) The organic waste gas enters the heat exchanger to exchange heat for the waste gas, and the heat exchange temperature directly reaches 270°C; 5-3-2) After heat exchange, the organic waste gas enters the electric heater, and the waste gas temperature is heated to the ignition temperature of 300°C. The electric heater is controlled by thermocouple 4. When the temperature of the organic waste gas reaches the ignition temperature, the electric heater stops working; 5-3-3) The organic waste gas heated to the ignition temperature enters the catalytic bed and is catalytically oxidized under the action of the catalyst. The organic matter in the waste gas is oxidized and decomposed into CO2 and H2O; the temperature of thermocouple 5 and thermocouple 6 is observed. When the temperature of thermocouple 6 exceeds 450℃, the pneumatic dilution air valve is started to control the temperature in the furnace; 5-3-4) The purified high-temperature gas enters the plate heat exchanger for heat exchange with the low-temperature organic waste gas. The gas temperature after heat exchange is 80°C and is cooled to 40°C by the air cooler.

Images