CN214182435U - High-concentration tetrahydrofuran organic waste gas treatment device - Google Patents
High-concentration tetrahydrofuran organic waste gas treatment device Download PDFInfo
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- CN214182435U CN214182435U CN202023094503.XU CN202023094503U CN214182435U CN 214182435 U CN214182435 U CN 214182435U CN 202023094503 U CN202023094503 U CN 202023094503U CN 214182435 U CN214182435 U CN 214182435U
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Abstract
The utility model discloses a high enriched tetrahydrofuran organic waste gas processing apparatus belongs to waste gas treatment technical field. The device comprises a gas conveying device, an adsorption device, an LEL online monitoring device, a desorption device, a vacuum pump and a condensation recovery device; the adsorption device is an adsorption tank, and the vacuum pump is connected with the adsorption tank; the adsorption tank is provided with a waste gas inlet, an exhaust port, a steam inlet, a steam outlet and a dry air flow outlet; the waste gas inlet is connected with the gas inlet pipeline; the exhaust port is connected with a main exhaust pipeline; the steam inlet is connected with a saturated steam pipeline, and the steam outlet is connected with the first row pipe condenser; the dry air flow outlet is connected to a spiral plate condenser. The device adopts a plurality of safety measures, a nitrogen generator is arranged on an air inlet pipeline to dilute organic waste gas, and hot steam is adopted for desorption and vacuum drying; the whole treatment process system is ensured to be in a low-oxygen state, and the safety problem caused by the explosive mixture formed by tetrahydrofuran and air is avoided from the source.
Description
Technical Field
The utility model belongs to the technical field of waste gas treatment, concretely relates to high enriched tetrahydrofuran organic waste gas treatment device.
Background
Tetrahydrofuran (THF) is a colorless, transparent, volatile, organic liquid with ether odor, has a molecular weight of 72.11, a density of 0.887g/mL, a melting point of 108.5 ℃ and a boiling point of 66 ℃, and is miscible with most organic solvents such as acetone, water, ether, benzene, etc. Tetrahydrofuran is a solvent with excellent performance and is used for dissolving PVC, butylaniline and the like; can be used as organic synthetic raw material, such as progesterone production. Tetrahydrofuran is volatile, and a large amount of tetrahydrofuran waste gas is volatilized into the environment in the production, storage and transportation processes, so that the tetrahydrofuran is harmful to the human body and the environment.
At present, the common treatment process of tetrahydrofuran organic waste gas is an adsorption method, and the most used adsorbent is activated carbon at present. The active carbon adsorption bed for treating tetrahydrofuran organic waste gas has the following problems: tetrahydrofuran is a polar gas, and activated carbon is a poor adsorbent of tetrahydrofuran, so that the adsorption effect is poor; the boiling point of tetrahydrofuran is low (the boiling point is 66 ℃), and the tetrahydrofuran is easy to escape after being adsorbed by activated carbon and has poor adsorption effect; the tetrahydrofuran waste gas is very likely to contain peroxide, and the peroxide has modification capacity on the surface of the activated carbon so that the activated carbon loses adsorption capacity; tetrahydrofuran and air can form explosive mixtures, and the activated carbon adsorption device is easy to cause safety accidents. The existing adsorption treatment device has certain potential safety hazard, the treatment efficiency is not ideal, and the treatment work of high-concentration organic waste gas is limited.
Disclosure of Invention
Aiming at the problems in the prior art, the technical problem to be solved by the utility model is to provide a high-concentration tetrahydrofuran organic waste gas treatment device, which adopts a plurality of safety measures, and a nitrogen generator is arranged on an air inlet pipeline to dilute the organic waste gas; the desorption is carried out by adopting hot steam, so that no air is mixed in the tetrahydrofuran organic waste gas after the desorption; vacuum drying is adopted to replace hot air drying; the implementation of the safety measures ensures that the whole treatment process system is in a low-oxygen state, and the safety problem caused by the explosive mixture formed by tetrahydrofuran and air is avoided from the source.
In order to solve the above problem, the utility model adopts the following technical scheme:
a high-concentration tetrahydrofuran organic waste gas treatment device comprises a gas conveying device, an adsorption device, an LEL online monitoring device, a desorption device, a vacuum pump and a condensation recovery device; the gas conveying device comprises a gas inlet pipeline, a nitrogen generator, a bypass exhaust pipeline and a main exhaust pipeline, wherein the nitrogen generator is arranged on the gas inlet pipeline; the desorption device comprises a saturated steam pipeline, a first tube array condenser and a second tube array condenser; the condensation recovery device comprises a rotary plate condenser, a layering tank and a storage tank; the adsorption device is an adsorption tank, and the vacuum pump is connected with the adsorption tank; the adsorption tank is provided with a waste gas inlet, an exhaust port, a steam inlet, a steam outlet and a dry gas outlet, and is respectively provided with a waste gas inlet valve, an exhaust port valve, a steam inlet valve, a steam outlet valve and a dry gas outlet valve; the waste gas inlet is connected with an air inlet pipeline; the exhaust port is connected with a main exhaust pipeline; the steam inlet is connected with a saturated steam pipeline, and the steam outlet is connected with the first tube array condenser; the outlet of the drying air flow is connected with a spiral plate condenser; LEL on-line monitoring device includes controller and FID detector, admission line and exhaust port department are located to the FID detector, the FID detector is connected with the controller, controller and gas delivery device, adsorption equipment, desorption device and vacuum pump connection guarantee that all switching actions are accomplished by LEL on-line monitoring device is automatic.
The high-concentration tetrahydrofuran organic waste gas treatment device comprises at least two adsorption tanks which are arranged in parallel and have the same structure.
In the high-concentration tetrahydrofuran organic waste gas treatment device, a liquid inlet and a liquid outlet are arranged on the spiral plate condenser, wherein the liquid inlet is connected with the second tube array condenser, and the liquid outlet is connected with the layering groove; the bottom of the layering tank is connected with a solvent recovery pipeline, and the upper part of the layering tank is connected with a storage tank; the storage tank is connected with a sewage treatment pipeline.
The steam inlet of the high-concentration tetrahydrofuran organic waste gas treatment device is connected with a saturated steam pipeline; the first tube nest condenser and the second tube nest condenser are connected in series, the first tube nest condenser is connected with a steam outlet, and the second tube nest condenser is connected with the spiral plate condenser.
The high-concentration tetrahydrofuran organic waste gas treatment device is characterized in that a bypass exhaust pipeline is connected with an air inlet pipeline and a main exhaust pipeline, and is provided with an exhaust valve which is connected with a controller.
The high-concentration tetrahydrofuran organic waste gas treatment device is characterized in that a waste gas filter and an air cooler are sequentially arranged on the gas inlet pipeline along the gas inlet direction.
The high-concentration tetrahydrofuran organic waste gas treatment device is characterized in that two steam inlets are formed in the adsorption tank.
Has the advantages that: compared with the prior art, the beneficial effects of the utility model are that:
(1) the high-efficiency treatment process for the high-concentration tetrahydrofuran organic waste gas has ultrahigh safety, the nitrogen generator replaces fresh air to dilute the waste gas inlet, the oxygen content is lower than 2 percent, the concentration of the inlet is ensured to be lower than the lower explosion limit, and air is effectively prevented from being mixed; the concentration of tetrahydrofuran in a real-time pipeline of an LEL online monitoring device is over-high, if the concentration is still unable to meet the lower explosion limit after dilution, emergency discharge is carried out; the desorption is carried out by adopting hot steam, so that no air is mixed in the tetrahydrofuran organic waste gas after the desorption; vacuum drying is adopted to replace hot air drying, when an adsorbent adsorbing organic compounds is blown and regenerated by hot air flow, great hidden danger exists in safety, vacuum desorption cooling is realized by reducing the air pressure of adsorbate molecules in a gas phase to increase the driving force of the adsorbate escaping from the surface of a solid, so that the adsorbate molecules are converted from a solid phase to the gas phase, the desorption purpose is achieved, the adsorption tank is in a state close to vacuum by utilizing the suction effect of a vacuum pump, at the moment, components adsorbed in active carbon are separated out together with water vapor, and condensation recovery is carried out in a condenser; the implementation of the safety measures ensures that the whole treatment process system is in a low-oxygen state, and the safety problem caused by the explosive mixture formed by tetrahydrofuran and air is avoided from the source.
(2) The activated carbon fiber-high efficiency resin composite bed in the treatment device of the utility model is of a multi-bed type, works in parallel, is mutually switched during operation, shares a set of pipeline system, and has the adsorption efficiency of 99.78 percent; the composite bed of activated carbon fiber-high-efficient resin can effectively overcome the excessive standard of short duration high concentration waste gas of multi-bed formula resin adsorption bed switching in-process and discharge, and when the valve switches the in-process, remaining high concentration waste gas passes through activated carbon fiber and adsorbs fast, ensures that the exhaust outlet is discharge up to standard.
(3) The active carbon fiber-high efficiency resin composite bed has larger adsorption capacity, uniform and smaller pore diameters of the active carbon fiber and the resin, large specific surface area, large adsorption capacity and stable adsorption performance; the temperature rise in the adsorption process of the composite bed is small, heat accumulation cannot occur, and explosion cannot easily occur; in the actual engineering, the adsorption capacity is 8 percent, and under the same condition, the adsorption capacity of the activated carbon is 5 percent, so that the adsorption period can be effectively prolonged; the composite bed has good adsorption effect on tetrahydrofuran, and the resin adsorbent hardly reacts with peroxide contained in tetrahydrofuran waste gas.
Drawings
FIG. 1 is a schematic structural diagram of a device for treating organic waste gas containing high concentration tetrahydrofuran;
FIG. 2 is a schematic flow diagram of a process for treating an organic waste gas containing high concentration of tetrahydrofuran;
FIG. 3 is a graph of total hydrocarbon mean versus treatment time;
FIG. 4 is a graph showing the relationship between the resin treatment efficiency and the treatment time.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Example 1
A high-concentration tetrahydrofuran organic waste gas treatment device is shown in a schematic structural diagram in figure 1, and comprises a gas conveying device, an adsorption device, an LEL online monitoring device, a desorption device, a vacuum pump and a condensation recovery device; the gas conveying device comprises an air inlet pipeline 1, a nitrogen generator, a bypass exhaust pipeline 12 and a main exhaust pipeline 11, wherein the nitrogen generator is arranged on the exhaust gas conveying pipeline and used for diluting the concentration of tetrahydrofuran in the exhaust gas and ensuring that the concentration of tetrahydrofuran at an inlet is lower than the lower explosion limit, otherwise, the tetrahydrofuran is emergently discharged from the bypass exhaust pipeline 12 and is prevented from contacting with air; be equipped with exhaust gas filter 18 and air cooler 19 along the direction of admitting air in proper order on the admission line 1, realize preliminary filtration and the cooling operation to organic waste gas, further improve exhaust-gas treatment efficiency.
The adsorption device comprises three adsorption tanks which are arranged in parallel and have the same structure; the LEL online monitoring device is connected with the gas conveying device, the adsorption device, the desorption device and the vacuum pump, and the gas conveying, adsorption, desorption and vacuum drying processes are controlled and completed by the controller; carrying out desorption treatment by adopting saturated steam; the adsorption tank is in a vacuum state by utilizing the suction effect of a vacuum pump in the vacuum drying system, and the components adsorbed in the adsorption medium are separated out together with water vapor and are condensed and recovered by a condensation recovery device.
The adsorption tank is provided with a waste gas inlet 5, an exhaust port 6, a steam inlet 7, a steam outlet 8 and a dry gas outlet 9, and is respectively provided with a waste gas inlet valve, an exhaust port valve, a steam inlet valve, a steam outlet valve and a dry gas outlet valve; the waste gas inlet 5 is connected with the gas inlet pipeline 1; the exhaust port 6 is connected with a main exhaust pipeline 11; the steam inlet 7 is connected with a saturated steam pipeline 10 in the desorption device, and the steam outlet 8 is connected with a first row pipe condenser 13 in the desorption device; the dry air outlet 9 is connected with a spiral plate condenser 15 in the condensation recovery device; the adsorption tank is connected with a vacuum pump; two steam inlets are arranged in each adsorption tank.
The condensation recovery device comprises a spiral plate condenser 15, a layering tank 16 and a storage tank 17; a liquid inlet of the spiral plate condenser 15 is connected with a dry gas outlet 9 in the desorption device, and a liquid outlet of the spiral plate condenser 15 is connected with the layering groove 16; the bottom of the layering tank 16 is connected with a solvent recovery pipeline, and the upper part of the layering tank is connected with a storage tank 17; the storage tank 17 is connected with a sewage treatment pipeline.
The desorption device comprises a saturated steam pipeline 10, a first tube array condenser 13 and a second tube array condenser 14; the steam inlet 7 is communicated with a saturated steam pipeline 10; the first tube array condenser 13 and the second tube array condenser 14 are arranged in series, the first tube array condenser 13 is connected with the steam outlet 8, and the second tube array condenser 14 is connected with a liquid inlet of the spiral plate condenser 15;
the LEL online monitoring device comprises a controller and an FID detector, the FID detector is arranged at the air inlet pipeline 1 and an exhaust port 6 of the adsorption tank, the FID detector arranged on the air inlet pipeline is used for detecting the concentration of diluted tetrahydrofuran in the air inlet pipeline, the FID detector arranged at the exhaust port of the adsorption tank is used for detecting the concentration of tetrahydrofuran in the exhaust of the adsorption tank, and whether the adsorption process is saturated or not is detected, so that the adsorption tank can be switched in time conveniently; the FID detector is connected with the controller, and the controller transmits signals to the corresponding device to carry out the next operation process.
A process for treating high-concentration tetrahydrofuran organic waste gas is shown in a process flow diagram in FIG. 2, wherein A, B, C in FIG. 2 represents a first adsorption tank 2, a second adsorption tank 3 and a third adsorption tank 4, respectively, and the process specifically comprises the following steps:
(1) opening a nitrogen generator to introduce nitrogen into the air inlet pipeline 1, and diluting and mixing the organic waste gas; the FID detector uploads the detected concentration of the organic waste gas to the controller, if the concentration of tetrahydrofuran is greater than the lower explosion limit, the controller controls to open an exhaust valve of the bypass exhaust pipeline 12, and the organic waste gas is emergently discharged to the main exhaust pipeline 11 from the bypass exhaust pipeline 12; if the concentration of the tetrahydrofuran is less than the lower explosion limit, otherwise, entering the step (2);
(2) organic waste gas firstly enters the carbon fiber-high efficiency resin composite bed through a waste gas inlet of the first adsorption tank 2 to be adsorbed and removed, and the organic waste gas is subjected to online detection by an FID detector and then enters the main exhaust pipeline 11 through an exhaust port to be exhausted; when the emission of the organic waste gas exceeds the limit value set by the FID detector, switching the organic waste gas inlet to the second adsorption tank 3;
(3) introducing saturated water vapor into the first adsorption tank 2 for adsorbing tetrahydrofuran, allowing the saturated water vapor to pass through a bed layer to desorb the adsorbed and concentrated organic matters, then allowing the organic matters to enter a first tubular condenser 13 and a second tubular condenser 14 for condensation treatment, and then allowing the organic matters to enter a condensation recovery device for condensation recovery; after the desorption is finished, the first adsorption tank 2 is in a vacuum state under the suction action of a vacuum pump, and components adsorbed in the adsorption medium are separated out together with water vapor and are condensed and recovered in a condensation recovery device; the first adsorption tank 2 waits for the organic waste gas treatment of the next period;
meanwhile, the second adsorption tank 3 is used for carrying out organic waste gas adsorption treatment, and when the emission of the organic waste gas exceeds the limit value set by the FID detector, the step (4) is carried out;
(4) introducing saturated water vapor into a second adsorption tank 3 for adsorbing tetrahydrofuran, allowing the saturated water vapor to pass through a bed layer to desorb the adsorbed and concentrated organic matters, then allowing the organic matters to enter a first tubular condenser 13 and a second tubular condenser 14 for condensation treatment, and then allowing the organic matters to enter a condensation recovery device for condensation recovery; after the desorption is finished, under the suction action of a vacuum pump, the second adsorption tank 3 is in a vacuum state, and the components adsorbed in the adsorption medium are separated out together with water vapor and enter a condensation recovery device for condensation recovery; the second adsorption tank 3 waits for the organic waste gas treatment of the next period;
meanwhile, the third adsorption tank 4 is used for adsorbing organic waste gas, and when the emission of the organic waste gas exceeds the limit value set by the FID detector, the step (5) is carried out;
(5) introducing saturated water vapor into a third adsorption tank 4 for adsorbing tetrahydrofuran, allowing the saturated water vapor to pass through a bed layer to desorb the adsorbed and concentrated organic matters, then allowing the organic matters to enter a first tube array condenser 13 and a second tube array condenser for condensation 14 treatment, and then allowing the organic matters to enter a condensation recovery device for condensation recovery; after the desorption is finished, under the suction action of a vacuum pump, the third adsorption tank 4 is in a vacuum state, and the components adsorbed in the adsorption medium are separated out together with water vapor and enter a condensation recovery device for condensation recovery; the third adsorption tank 4 waits for the organic waste gas treatment of the next period;
(6) and (3) continuously repeating the step (2), the step (3), the step (4) and the step (6), repeatedly performing adsorption, desorption and vacuum drying to realize continuous treatment of the organic waste gas, wherein the vacuum drying time is 10-15 min.
Certain pharmaceutical enterprises use tetrahydrofuran as a solvent to produce the biphenylalcohol, and a reaction kettle can generate a strand of high-concentration tetrahydrofuran organic waste gas in the production process. The lower explosion limit of tetrahydrofuran is 1.8 percent, namely 57946mg/m3. The air volume of the tetrahydrofuran organic waste gas is 500m3H (35 ℃), concentration of 50000mg/m3(the value detected by the FID detector is mg/m3Amount of C, 50000mg/m3Converted into tetrahydrofuran mass, i.e. 96261mg/m3) The air volume is 500m3And/h, exceeding the lower explosion limit of tetrahydrofuran, and presenting explosion danger.
Enterprises adopt the high-efficiency treatment process and the device for the high-concentration tetrahydrofuran organic waste gas to treat, and supplement nitrogen to dilute and reserve a certain amount of safety margin in the treatment process, wherein the supplement nitrogen is 1000m3The concentration of the diluted organic waste gas is 16700 mg/m3And less than 55% LEL. The final waste gas treatment efficiency is as high as 99.85%, and the outlet concentration is 80mg/m3590kg of tetrahydrofuran solvent can be recovered every day with a recovery rate of 98.3% in 2000m3For example, a carbon canister with a/h air volume, the resin adsorption canister has a volume of 15m3The maximum air extraction amount of the vacuum pump is 3m3The vacuum drying time is 10-15min, and the desorption can be complete; the economic benefit is remarkable.
In the treatment process, the adsorption efficiency of the three-bed type activated carbon fiber-high-efficiency resin composite bed can reach 99.78 percent. The exhaust gas detection data are shown in fig. 3 and 4. As shown in FIG. 3, the average concentration of the waste gas at the inlet of the three-bed type activated carbon fiber-high efficiency resin composite bed is 15340.2mg/m3The average outlet concentration is 33.4mg/m3Outlet ofThe concentration can meet the emission standard of atmospheric pollutants in pharmaceutical industry (GB 37823-2019) and the special emission limit value of non-methane total hydrocarbon is 60mg/m3And (4) requiring. As shown in fig. 4, the average treatment efficiency was 99.78%.
Claims (7)
1. A high-concentration tetrahydrofuran organic waste gas treatment device is characterized by comprising a gas conveying device, an adsorption device, an LEL online monitoring device, a desorption device, a vacuum pump and a condensation recovery device; the gas conveying device comprises a gas inlet pipeline (1), a nitrogen generator, a bypass exhaust pipeline (12) and a main exhaust pipeline (11), wherein the nitrogen generator is arranged on the gas inlet pipeline; the desorption device comprises a saturated steam pipeline (10), a first tube array condenser (13) and a second tube array condenser (14); the condensation recovery device comprises a rotary plate condenser (15), a layering tank (16) and a storage tank (17); the adsorption device is an adsorption tank, and the vacuum pump is connected with the adsorption tank; the adsorption tank is provided with a waste gas inlet (5), an exhaust port (6), a steam inlet (7), a steam outlet (8) and a dry gas outlet (9), and is respectively provided with a waste gas inlet valve, an exhaust port valve, a steam inlet valve, a steam outlet valve and a dry gas outlet valve; the waste gas inlet (5) is connected with the gas inlet pipeline (1); the exhaust port (6) is connected with a main exhaust pipeline (11); the steam inlet (7) is connected with a saturated steam pipeline (10), and the steam outlet (8) is connected with a first tube-in-tube condenser (13); the dry air flow outlet (9) is connected with a spiral plate condenser (15); LEL on-line monitoring device includes controller and FID detector, admission line and exhaust port department are located to the FID detector, the FID detector is connected with the controller, controller and gas delivery device, adsorption equipment, desorption device and vacuum pump connection.
2. The device for treating the high-concentration tetrahydrofuran organic waste gas according to claim 1, wherein the adsorption device comprises at least two adsorption tanks which are arranged in parallel and have the same structure.
3. The high-concentration tetrahydrofuran organic waste gas treatment device according to claim 1, wherein the spiral plate condenser (15) is provided with a liquid inlet and a liquid outlet, wherein the liquid inlet is connected with the second tube array condenser (14), and the liquid outlet is connected with the layering tank (16); the bottom of the layering tank (16) is connected with a solvent recovery pipeline, and the upper part of the layering tank is connected with a storage tank (17); the storage tank (17) is connected with a sewage treatment pipeline.
4. The device for treating the high-concentration tetrahydrofuran organic waste gas according to claim 1, wherein the steam inlet (7) is connected with a saturated steam pipeline (10); first tube nest condenser (13) and second tube nest condenser (14) are established ties and are set up, first tube nest condenser (13) are connected with steam outlet (8), second tube nest condenser (14) are connected with spiral plate condenser (15).
5. The high-concentration tetrahydrofuran organic waste gas treatment device according to claim 1, wherein the bypass exhaust pipeline (12) is connected with the gas inlet pipeline (1) and the main exhaust pipeline (11), and the bypass exhaust pipeline (12) is provided with an exhaust valve which is connected with a controller.
6. The device for treating the organic waste gas containing high concentration of tetrahydrofuran according to claim 1, wherein the inlet pipeline is provided with an exhaust gas filter and an air cooler in sequence along the inlet direction.
7. The device for treating the high-concentration tetrahydrofuran organic waste gas according to claim 1, wherein two steam inlets are arranged on the adsorption tank.
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