CN211799850U - Pressure swing adsorption purification recovery device for polypropylene SPG process tail gas - Google Patents
Pressure swing adsorption purification recovery device for polypropylene SPG process tail gas Download PDFInfo
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- CN211799850U CN211799850U CN202020232353.5U CN202020232353U CN211799850U CN 211799850 U CN211799850 U CN 211799850U CN 202020232353 U CN202020232353 U CN 202020232353U CN 211799850 U CN211799850 U CN 211799850U
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Abstract
The utility model relates to a tail gas treatment technical field, concretely relates to pressure swing adsorption purification recovery unit of polypropylene SPG technology tail gas. The device for purifying and recovering the polypropylene SPG process tail gas by pressure swing adsorption comprises a recovered gas buffer tank, a folding wave filter, a compressor, a cold dryer, a three-stage precision filter, a separator and a pressure swing adsorption tower which are sequentially connected; the recycle gas buffer tank is connected with a polypropylene SPG process tail gas pipeline; the top of the pressure swing adsorption tower is connected with a nitrogen buffer tank through a nitrogen discharge pipeline and is also connected with a flushing gas buffer tank through a forward discharge pipeline; the bottom of the pressure swing adsorption tower is connected with an air inlet pipeline and a reverse release pipeline.
Description
Technical Field
The utility model relates to a tail gas treatment technical field, concretely relates to pressure swing adsorption purification recovery unit of polypropylene SPG technology tail gas.
Background
In the SPG continuous polypropylene process, PP powder is contacted with nitrogen at about 100 ℃ in a dryer to separate volatile components such as trace propylene, propane and the like, and simultaneously, a catalyst is inactivated. The separated nitrogen contains VOCs gases such as propylene, propane, ethylene and the like. The part of gas has low organic matter concentration and can not be combusted automatically, so that the part of gas can not be discharged after being combusted by a torch; but the concentration of the VOCs gas is far beyond the national VOCs gas emission standard, so the VOCs gas can be discharged after being treated.
The patent CN201811610062.9 discloses a process and a device for purifying and recovering polypropylene tail gas by pressure swing adsorption, wherein materials in a polypropylene polymerization kettle are subjected to medium-pressure and isobaric recovery and then enter a flash evaporation kettle, a part of gas in the flash evaporation kettle is subjected to low-pressure and isobaric recovery and then enters a gas holder, the gas in the gas holder is pressurized by a propylene condensation compressor and then enters a liquefaction tank after heat exchange by a heat exchanger, non-condensable gas in the liquefaction tank is separated by a gas-liquid separator and enters a buffer tank after pressure reduction; the residual gas in the flash evaporation kettle is replaced by nitrogen, and the replacement gas is pressurized by a vacuum booster and then is introduced into a buffer tank; the gas in the buffer tank is subjected to pressure swing adsorption treatment, the recovered propylene enters a gas holder, and the impurity gas is cooled through an expander and enters a heat exchanger for heat exchange as a cold source medium to be recycled or discharged. The yield of propylene in the process is more than or equal to 99 percent, and the propylene purity of the recovered gas is more than or equal to 95 percent. However, the device and the process are used for tail gas generated in the production of liquid-phase bulk polypropylene by a batch method, and are not suitable for the SPG continuous polypropylene process.
SUMMERY OF THE UTILITY MODEL
In order to solve the not enough of prior art, the utility model provides a pressure swing adsorption purification recovery unit of polypropylene SPG technology tail gas adopts the pressure swing adsorption technique to purify polypropylene SPG technology tail gas, has still retrieved the nitrogen gas in the tail gas when desorption organic gases such as propylene, propane, has both solved and has discharged the environmental protection problem and for the gain of enterprise again.
The utility model relates to a pressure swing adsorption purification recovery device of polypropylene SPG process tail gas, which comprises a recycle gas buffer tank, a wave filter, a compressor, a cold dryer, a three-level precision filter, a separator and a pressure swing adsorption tower which are connected in sequence; the recycle gas buffer tank is connected with a polypropylene SPG process tail gas pipeline; the top of the pressure swing adsorption tower is connected with a nitrogen buffer tank through a nitrogen discharge pipeline, and the nitrogen buffer tank is connected with a nitrogen recycling pipeline; the top of the pressure swing adsorption tower is also connected with a flushing gas buffer tank through a forward discharge pipeline; the bottom of the pressure swing adsorption tower is connected with an air inlet pipeline and a reverse release pipeline.
And the polypropylene SPG process tail gas pipeline of the raw material gas buffer tank is connected with a vent pipeline.
The two corrugated filters are connected in parallel, and an inlet-outlet differential pressure transmitter is arranged between the two ends of each corrugated filter. The two corrugated filters are connected in parallel, an on-off-standby mode is adopted during start-up, the operating state of the corrugated filters can be judged by the inlet-outlet differential pressure transmitter through front-back differential pressure data, and the corrugated filters can be switched and processed in time when blockage occurs.
A program control valve is arranged on a pipeline between the compressor and the folding wave filter and is electrically connected with the compressor; the compressor is provided with an electric pressure regulating valve.
The program control valve timely cuts off the air inlet and controls and interlocks with the compressor under the condition that the pressure swing adsorption device has problems, and simultaneously opens the emptying pipeline, thereby ensuring that the normal operation of the front working section is not influenced.
The compressor adopts a pressure electric regulating valve to control the loop once and twice, and the first loop is preferred; the control signal adopts the pressure signal of the inlet pipeline of the compressor, so that the low-pressure condition is prevented. The compressor motor is frequency-variable and speed-adjustable, and the control signal also adopts the pressure of an inlet pipeline to prevent overpressure or low pressure. Therefore, the front pressure of the compressor is ensured to be stable through two control options, and the normal operation of the front working section is ensured not to be influenced.
The cold dryer is provided with a temperature electric regulating valve.
The cold dryer is also regulated by frequency conversion, the outlet temperature of the cold dryer is adopted as a control signal, the dehydration dew point is kept at 2-5 ℃, and the requirement of a pressure swing adsorption device on the water content of the raw material gas is met.
The number of the pressure swing adsorption towers is 4-7, the tops of a plurality of pressure swing adsorption towers are respectively connected in parallel on a pressure equalizing pipeline, a forward discharge pipeline and a nitrogen discharge pipeline, and the bottoms of a plurality of pressure swing adsorption towers are respectively connected in parallel on an air inlet pipeline and a reverse discharge pipeline.
The gas inlet pipeline is connected with a high-purity nitrogen pipeline, and the reverse release pipeline is provided with a vacuum pump.
After passing through a bed layer of the pressure swing adsorption tower, propylene and propane in tail gas are adsorbed, product gas is nitrogen with the purity of more than 99.7%, the nitrogen is discharged through a nitrogen discharge pipeline and reused, and desorbed gas is about 70% of propylene and propane mixed gas, and is discharged through a reverse discharge pipeline and returned to a propylene recovery system.
The nitrogen buffer tank is also connected with a nitrogen pressure supplementing pipeline, and a tank pressure electric regulating valve is installed on the nitrogen pressure supplementing pipeline.
The working process of the pressure swing adsorption purification recovery device for the polypropylene SPG process tail gas comprises the following steps:
the tail gas of the polypropylene SPG process is stabilized by a recycle gas buffer tank, then sequentially filtered by a folding filter, pressurized to 0.35-0.7MPa by a compressor, cooled and dehydrated by a cold dryer, further filtered and separated by a three-stage precision filter and a separator, and then introduced into a pressure swing adsorption system for separation and purification, wherein the pressure swing adsorption process flow is as follows:
(1) adsorption: the tail gas of the polypropylene SPG process passes through a bed layer of a pressure swing adsorption tower, wherein propylene and propane are adsorbed by an adsorbent, and nitrogen enters a nitrogen buffer tank for recycling through a nitrogen discharge pipeline;
(2) placing in sequence: after adsorption is finished, the gas with higher pressure continuously enters a flushing gas buffer tank along the adsorption direction through a forward pipeline;
(3) pressure equalizing and reducing: after the forward discharging is finished, discharging the mixed gas in the tower to another adsorption tower in a pressure equalizing and rising state along the adsorption direction;
(4) reverse amplification: the propylene and propane mixed gas absorbed in the tower is recycled through a reverse release pipeline against the absorption direction;
(5) washing: flushing the bed layer from the top of the pressure swing adsorption tower against the adsorption direction by using the cis-purge gas in the purge gas buffer tank to completely regenerate the adsorbent in the pressure swing adsorption tower;
(5) boosting pressure: after the adsorbent is completely regenerated, raising the pressure of the pressure swing adsorption tower to 80-85% of the adsorption pressure;
(7) final charging: and (3) feeding the polypropylene SPG process tail gas into the pressure swing adsorption tower from the bottom, and finally increasing the pressure of the pressure swing adsorption tower to the adsorption pressure.
The pressure swing adsorption tower has the reverse releasing pressure of 0.15MPa, the adsorption pressure of 0.35-0.7MPa and the adsorption temperature of 30-40 deg.c.
The adsorbent is a special moleculeSieve HL-C3H6。
The principle of pressure swing adsorption gas separation technology is based on that different gas components have different adsorption amounts, adsorption rates and adsorption forces for specific types of molecular sieves under the condition of different partial pressures. The adsorbent is selected and the operation conditions are controlled to change, so that high-pressure adsorption and low-pressure desorption are realized, and the target gas is purified by completing the adsorption and desorption process of the adsorbate.
The reasonable selection of the adsorbent can achieve excellent selectivity to the target gas and is easy to desorb. Certain kinds of gases (H) can be adsorbed by utilizing the principle of selective adsorbent and gas competitive adsorption2、N2CO, etc.) to above 99.9%.
During adsorption, the propylene and propane in the tail gas are easily adsorbed by the adsorbent, and the nitrogen is not easily adsorbed, so that the nitrogen in the tail gas is separated.
When in the forward position, the higher pressure gas accounts for about 5-7% of the total gas flow and is used as the regeneration gas when the flushing process is operated.
The average pressure drop is the process of purifying the recovered effective gases of propylene and propane.
The reverse discharge is the process of adsorbent regeneration.
The purpose of the rinse is to fully regenerate the adsorbent.
The pressure swing adsorption recovery process designed aiming at the tail gas components of the polypropylene SPG process is simple and efficient, can ensure continuous higher recovery rate of organic gases such as propylene and the like, and simultaneously recovers high-concentration nitrogen.
Compared with the prior art, the utility model discloses there is following beneficial effect:
(1) the whole set of device has high automation degree, simple operation, capability of eliminating human interference factors, automatic unmanned operation, good device stability, low failure rate, only a program control valve for a movable part, quick start and stop and simple operation;
(2) the pressure swing adsorption device of the utility model has low energy consumption, strong operation adaptability of pressure swing adsorption in different pressure ranges and large operation elasticity, and can realize automatic adjustment of load between 30 percent and 120 percent by combining with online analysis data;
(3) all final pressure boosting of the pressure swing adsorption device of the utility model adopts self-adaptive regulation control, which can ensure that the pressure variation process of the adsorption tower is close to an ideal pressure curve, ensure the stability of the adsorption and desorption processes and reduce the noise of the air flow of the pipeline;
(4) the utility model discloses an adsorbent long service life, normal use can maintain more than 10 years, and the VOCs content reaches national emission standard in the exhaust after the processing, reduces the secondary treatment expense of enterprise to retrieve nitrogen gas purity and reach more than 99.7%, can repeat the recycle, not only economic benefits has produced good environmental protection social effect again.
Drawings
FIG. 1 is a schematic view of a pressure swing adsorption purification recovery device for polypropylene SPG process tail gas of the present invention;
in the figure: 1. a polypropylene SPG process tail gas pipeline; 2. an emptying pipeline; 3. a recycle gas buffer tank; 4. a folding filter; 5. an inlet and outlet differential pressure transmitter; 6. a program-controlled valve; 7. a pressure electric regulating valve; 8. a compressor; 9. a cold dryer; 10. an electric temperature regulating valve; 11. a third-stage precision filter; 12. a separator; 13. a high purity nitrogen line; 14. an air intake line; 15. a pressure swing adsorption tower; 16. a vacuum pump; 17. reverse discharging the pipeline; 18. a nitrogen pressure-supplementing pipeline; 19. a tank pressure electric regulating valve; 20. a nitrogen buffer tank; 21. a nitrogen recycling pipeline; 22. a pressure equalization line; 23. a purge gas buffer tank; 24. arranging pipelines in sequence; 25. a nitrogen vent line.
Detailed Description
The following embodiments are combined to further explain the present invention, but the protection scope of the present invention is not limited thereto, and the professional in this field should be right the technical solution of the present invention should all belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, the pressure swing adsorption purification recovery device for polypropylene SPG process tail gas of the present invention comprises a recycle gas buffer tank 3, a corrugated filter 4, a compressor 8, a cold dryer 9, a three-stage precision filter 11, a separator 12 and a pressure swing adsorption tower 15 which are connected in sequence; the recycle gas buffer tank 3 is connected with a polypropylene SPG process tail gas pipeline 1; the top of the pressure swing adsorption tower 15 is connected with a nitrogen buffer tank 20 through a nitrogen discharge pipeline 25, and the nitrogen buffer tank 20 is connected with a nitrogen recycling pipeline 21; the top of the pressure swing adsorption tower 15 is also connected with a flushing gas buffer tank 23 through a forward pipeline 24; the bottom of the pressure swing adsorption tower 15 is connected with an air inlet pipeline 14 and a reverse releasing pipeline 17.
And a vent pipeline 2 is connected to a polypropylene SPG process tail gas pipeline 1 of the recycle gas buffer tank 3.
The folding wave filter 4 is two parallel connection, and an inlet and outlet differential pressure transmitter 5 is arranged between two ends of the folding wave filter 4. The two corrugated filters 4 are connected in parallel, an on-off-standby mode is adopted during start-up, the operation state of the corrugated filters 4 can be judged by the inlet-outlet differential pressure transmitter 5 through front-back differential pressure data, and the corrugated filters can be switched and processed in time when blockage occurs.
A program control valve 6 is arranged on a pipeline between the compressor 8 and the folding wave filter 4, and the program control valve 6 is electrically connected with the compressor 8; the compressor 8 is provided with an electric pressure regulating valve 7.
The program control valve 6 timely cuts off the air inlet and controls and interlocks with the compressor 8 under the condition that the pressure swing adsorption device has problems, and simultaneously opens an emptying pipeline to ensure that the normal operation of the front working section is not influenced.
The compressor 8 adopts a pressure electric regulating valve 7 control loop for one loop and two loops, and the first loop is preferred; the control signal adopts the pressure signal of the inlet pipeline of the compressor 8 to prevent the low pressure condition. The motor of the compressor 8 is subjected to frequency conversion speed regulation, and the control signal also adopts the pressure of an inlet pipeline to prevent overpressure or low pressure. Therefore, the pressure in front of the compressor 8 is ensured to be stable through two control options, and the normal operation of the front working section is ensured not to be influenced.
The refrigeration dryer 9 is provided with a temperature electric regulating valve 10.
The cold dryer 9 also adopts frequency conversion regulation, the control signal adopts the outlet temperature of the cold dryer, the dehydration dew point is ensured to be maintained at 2-5 ℃, and the requirement of a pressure swing adsorption device on the water content of the raw material gas is met.
The number of the pressure swing adsorption towers 15 is 5, the tops of the pressure swing adsorption towers 15 are respectively connected in parallel on a pressure equalizing pipeline 22, a forward discharging pipeline 24 and a nitrogen discharging pipeline 25, and the bottoms of the pressure swing adsorption towers 15 are respectively connected in parallel on an air inlet pipeline 14 and a reverse discharging pipeline 17.
The air inlet pipeline 14 is connected with a high-purity nitrogen pipeline 13, and the reverse release pipeline 17 is provided with a vacuum pump 16.
After passing through a bed layer of a pressure swing adsorption tower 15, propylene and propane in tail gas are adsorbed, product gas is nitrogen with the purity of more than 99.7%, the nitrogen is discharged through a nitrogen discharge pipeline 25 and reused, and desorbed gas is about 70% of propylene and propane mixed gas, and is discharged through a reverse discharge pipeline 17 and returned to a propylene recovery system.
The nitrogen buffer tank 20 is also connected with a nitrogen pressure supplementing pipeline 18, and a tank pressure electric regulating valve 19 is installed on the nitrogen pressure supplementing pipeline 18.
Example 2
The device for purifying and recovering the polypropylene SPG process tail gas in the embodiment 1 is adopted to treat the tail gas of 30 ten thousand tons/year SPG process polypropylene enterprises, the temperature of the tail gas is 35 ℃, the pressure is 1.5KPa (g), and the flow rate is 1500Nm3The analysis of the components of the tail gas in mol percent is as follows:
| name (R) | Propylene (PA) | Propane | Nitrogen gas | N-butane | Ethane (III) | Steam of water | C6+ | Isopentane |
| Content,% mol | 2.46 | 1.044 | 96.457 | 0.001 | 0.034 | Saturation of | 0.02 | 0.001 |
The specific process steps are as follows:
the tail gas of polypropylene SPG technology loops through the ripples filter 4 and filters after the recovery gas buffer tank 3 steady voltage, pressurizes to 0.5-0.8MPa (according to nitrogen retrieval and utilization pressure requirement adjustment) through compressor 8 earlier, cools down the dehydration through cold dry machine 9, further filters the separation through tertiary precision filter 11 and separator 12, and the rethread pressure swing adsorption system separates the purification, pressure swing adsorption's processing flow is as follows:
(1) adsorption: the tail gas of the polypropylene SPG process passes through a 15-bed layer of a pressure swing adsorption tower, wherein propylene and propane are adsorbed by a special molecular sieve HL-C for an adsorbent3H6The adsorbed nitrogen enters the nitrogen buffer tank 20 for recycling through a nitrogen discharge pipeline 25;
(2) placing in sequence: after adsorption is finished, the gas with higher pressure continuously enters the flushing gas buffer tank 23 along the adsorption direction through the forward pipeline 24, and the gas with higher pressure accounts for 5-7% of the total gas flow and is used as regeneration gas during running of the flushing flow;
(3) pressure equalizing and reducing: after the forward discharging is finished, discharging the mixed gas in the tower to another adsorption tower in a pressure equalizing and rising state along the adsorption direction, and realizing the purification and recovery of effective gases of propylene and propane;
(4) reverse amplification: the propylene and propane mixed gas absorbed in the tower is recycled through a reverse release pipeline 17 against the absorption direction, so that the regeneration of the absorbent is realized;
(5) washing: flushing the bed layer from the top of the pressure swing adsorption tower 15 against the adsorption direction by using the purge gas in the purge gas buffer tank 23 to completely regenerate the adsorbent in the pressure swing adsorption tower 15;
(6) boosting pressure: after the adsorbent is completely regenerated, raising the pressure of the pressure swing adsorption tower 15 to 80 percent of the adsorption pressure;
(7) final charging: and (3) feeding the polypropylene SPG process tail gas into the pressure swing adsorption tower 15 from the bottom, and finally increasing the pressure of the pressure swing adsorption tower 15 to the adsorption pressure of 0.35-0.7 MPa.
After treatment: the nitrogen pressure of the product gas is more than or equal to 0.35MPa (g), and the nitrogen purity is more than or equal to 99.9; if the nitrogen is recycled, the whole set of device has no three-waste discharge; if the nitrogen is discharged, the content of VOCs is less than 30 ppm.
Claims (8)
1. A pressure swing adsorption purification recovery unit of polypropylene SPG technology tail gas which characterized in that: comprises a recycle gas buffer tank (3), a folding filter (4), a compressor (8), a cold dryer (9), a three-stage precision filter (11), a separator (12) and a pressure swing adsorption tower (15) which are connected in sequence; the recycle gas buffer tank (3) is connected with a polypropylene SPG process tail gas pipeline (1); the top of the pressure swing adsorption tower (15) is connected with a nitrogen buffer tank (20) through a nitrogen discharge pipeline (25), and the nitrogen buffer tank (20) is connected with a nitrogen recycling pipeline (21); the top of the pressure swing adsorption tower (15) is also connected with a flushing gas buffer tank (23) through a forward discharge pipeline (24); the bottom of the pressure swing adsorption tower (15) is connected with an air inlet pipeline (14) and a reverse release pipeline (17).
2. The apparatus for pressure swing adsorption, purification and recovery of polypropylene SPG process tail gas according to claim 1, wherein: the polypropylene SPG process tail gas pipeline (1) of the recycle gas buffer tank (3) is connected with an emptying pipeline (2).
3. The apparatus for pressure swing adsorption, purification and recovery of polypropylene SPG process tail gas according to claim 1, wherein: the folding wave filter (4) is composed of two parallel-connected folding wave filters, and an inlet-outlet differential pressure transmitter (5) is arranged between the two ends of each folding wave filter (4).
4. The apparatus for pressure swing adsorption, purification and recovery of polypropylene SPG process tail gas according to claim 1, wherein: a program control valve (6) is arranged on a pipeline between the compressor (8) and the folding wave filter (4), and the program control valve (6) is electrically connected with the compressor (8); the compressor (8) is provided with an electric pressure regulating valve (7).
5. The apparatus for pressure swing adsorption, purification and recovery of polypropylene SPG process tail gas according to claim 1, wherein: the cold dryer (9) is provided with a temperature electric regulating valve (10).
6. The apparatus for pressure swing adsorption, purification and recovery of polypropylene SPG process tail gas according to claim 1, wherein: the number of the pressure swing adsorption towers (15) is 4-7, the tops of a plurality of pressure swing adsorption towers (15) are respectively connected in parallel on a pressure equalizing pipeline (22), a forward discharging pipeline (24) and a nitrogen discharging pipeline (25), and the bottoms of a plurality of pressure swing adsorption towers (15) are respectively connected in parallel on an air inlet pipeline (14) and a reverse discharging pipeline (17).
7. The apparatus for pressure swing adsorption, purification and recovery of polypropylene SPG process tail gas according to claim 6, wherein: the air inlet pipeline (14) is connected with a high-purity nitrogen pipeline (13), and the reverse release pipeline (17) is provided with a vacuum pump (16).
8. The apparatus for pressure swing adsorption, purification and recovery of polypropylene SPG process tail gas according to claim 1, wherein: the nitrogen buffer tank (20) is also connected with a nitrogen pressure supplementing pipeline (18), and a tank pressure electric regulating valve (19) is installed on the nitrogen pressure supplementing pipeline (18).
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| CN202020232353.5U CN211799850U (en) | 2020-02-28 | 2020-02-28 | Pressure swing adsorption purification recovery device for polypropylene SPG process tail gas |
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| CN202020232353.5U CN211799850U (en) | 2020-02-28 | 2020-02-28 | Pressure swing adsorption purification recovery device for polypropylene SPG process tail gas |
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