CN105056703A - Methanol waste gas recovery method based on fine adsorption tower - Google Patents
Methanol waste gas recovery method based on fine adsorption tower Download PDFInfo
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Abstract
The present invention provides a methanol waste gas recovery method and apparatus based on fine adsorption tower, and the method integrates absorption and adsorption, and has high efficiency and ultra-low emission concentration. Aiming at the problems of high energy consumption, low recovery rate and higher emission concentration in a methanol gas recovery system, the invention develops a recycling apparatus, which integrates absorption and adsorption and has high efficiency and ultra-low emission concentration, and directly uses water as an absorbent for absorbing methanol waste gas; the water absorbing methanol is sent to owners for water treatment. The methanol waste gas recovery method based on fine adsorption tower effectively overcomes the heat adsorption by adsorbent, prolongs service life of the adsorbent, has good safety, and solves the key problem of ultra-low emission concentration; and the method uses water to absorb methanol waste gas, and has lower energy consumption. In addition, data processing and gas analysis workstation conduct on-line analysis and automatic control of apparatus, and gas gathering, absorption, adsorption and desorption operations are controlled.
Description
Technical field
The present invention relates to methanol waste gas recovery technology field, relate to the methanol waste gas recovery system based on smart adsorption tower, be related specifically to that one " absorb+absorption " is integrated, efficient, the high efficiency methanol gas recovery method of minimum discharge concentration and device thereof.
Background technology
When methyl alcohol entrucking is dropped a hint, a large amount of methyl alcohol and air gas mixture can be given off.If this mist is directly discharged in air, not only cause environmental pollution and energy waste, also may bring disaster hidden-trouble, bring hidden danger to people life property safety.After taking methanol waste gas to reclaim, the methyl alcohol of more than 95% is recovered, and greatly reduces methyl alcohol and escapes, and improves the operating environment in entrucking place well, and overcomes the potential safety hazard that methanol emissions brings.
Retrieved domestic and foreign databases according to the technology of the present invention feature, find that the patent that relevant methanol waste gas reclaims is less.Such as, Chinese patent CN200910075020.4 mentions and utilizes absorption process to reclaim methanol waste gas in vitamin C producing process, and absorbent is the mixed thing of water, alcohol compound, and this invention weak point is: the tail gas after the method reclaims is high containing methanol concentration; Chinese patent CN102380288A refer to a kind of oil-gas recovery method and device of absorption-adsorbing integration technology, this invention weak point is: the oil gas absorbing agent development difficulty used by the method is large, cost is high, be not suitable for methanol waste gas to reclaim, and tail gas concentration can not meet and releases souls from purgatory concentration requirement.Through retrieval, also not integrated, efficient based on smart adsorption tower employing " absorption+absorption ", minimum discharge concentration reclaims methyl alcohol and utilizes water to absorb the technology of methanol waste gas as absorbent at present.
Summary of the invention
The present invention is for solving the problems such as energy resource consumption is large, the rate of recovery is low in methanol waste gas recovery system, develop the methanol waste gas recovery system based on smart adsorption tower, adopt " absorbing+absorption " in integrated, efficient, the minimum discharge concentration recovery system of one, and propose and directly utilize water to absorb methanol waste gas, absorb the water after methyl alcohol and deliver to owner's water treatment.
(1) technical scheme of the present invention is as follows:
Methanol waste gas recovery system based on smart adsorption tower comprises: blower fan, absorption tower, frequency conversion explosion proof water pump, adsorption tower A, adsorption tower B, smart adsorption tower C, vavuum pump, control system, data acquisition process and the accessory such as gas analysis work station and flowmeter, liquid level gauge, pressure sensor, temperature sensor, valve, spark arrester and pipeline.
The blower fan of the 1. described methanol waste gas recovery system based on smart adsorption tower is frequency conversion explosion proof blower fan, according to admission pressure size, carry out variable frequency adjustment rotation speed of fan by pressure sensor, thus control blower fan absorbing quantity, general setting admission pressure is not less than-500Pa (gauge pressure).
Pipe distributor, groove type distributor or tube and tank type distributor can be arranged in the absorption tower main body of the 2. described methanol waste gas recovery system based on smart adsorption tower, absorption tower main body arranges liquid level gauge, several temperature sensors and pressure sensor along absorption tower short transverse.
Further, described absorption tower height is determined according to treating capacity, is generally 1 ~ 15m, and diameter is 0.5 ~ 2m.
Further, the absorbent in described absorption tower is water.
Further, described coolant-temperature gage < 35 DEG C, flow is 1 ~ 10t/h, and sprinkle density is 0.32 ~ 50.96m
3/ (m
2h).
Further, the liquid level of described liquid level gauge controls the flow of frequency conversion explosion proof water pump, thus it is effectively moderate that guarantee is sprayed.
Further, described absorption equipment absorptivity is 70% ~ 90%.
Adsorption tower A, the adsorption tower B of the 3. described methanol waste gas recovery system based on smart adsorption tower, smart adsorption tower C main body arrange several temperature sensors and pressure sensor along adsorption tower A, adsorption tower B, smart adsorption tower C short transverse.
Further, described adsorption tower A, adsorption tower B are highly 1 ~ 10m, and diameter is 0.5 ~ 2.5m, and described smart adsorption tower C is highly 0.5 ~ 8m, and diameter is 0.5 ~ 2m.
Further, in described adsorption tower A, adsorption tower B, smart adsorption tower C, the filling diameter of adsorbent is determined by formula (1), and in described adsorption tower A, adsorption tower B, smart adsorption tower C, the packed height of adsorbent is determined by formula (2):
In formula:
The filling diameter of D---adsorbent, m;
Q---the charge flow rate of methyl alcohol-air Mixture, m
3/ s (STP);
The empty tower gas velocity of ν---fixed-bed adsorber, generally gets 0.1 ~ 0.3m/s;
The packed height of H---adsorbent, m;
C
in---methanol gas molar fraction in charging, mol/mol;
τ---adsorbent time, s;
η---methanol gas (quality) rate of recovery, %;
ρ---adsorbent packing density, kg/m
3;
Q---adsorbent capacity, g (methanol gas)/g (adsorbent).
Further, in general adsorption tower, the packed height diameter of adsorbent is than H/D=2 ~ 4, if H/D exceedes should suitably adjust H, D value.
Further, the adsorbent loaded in described adsorption tower A, adsorption tower B is active carbon, silica gel, dewatering silica gel, resin, zeolite, AdsFOV-II, Composite Adsorbent Absorbing agent, and the adsorbent loaded in described smart adsorption tower C is AdsFOV-III.
The vavuum pump of the 4. described methanol waste gas recovery system based on smart adsorption tower is dry vacuum pump.
Further, described dry vacuum pump vacuum is at more than 85kPa.
The control system of the 5. described methanol waste gas recovery system based on smart adsorption tower automatically controls the power-equipment of whole recovery system, to carry out gas collection, absorption and sorption and desorption operations in good time.
The data acquisition process of the 6. described methanol waste gas recovery system based on smart adsorption tower and gas analysis work station be by on-line monitoring air hatch, absorption tower, in adsorption tower, the data such as the exhaust gas concentration of exhaust outlet determine absorption and sorption, desorption operations.
Methanol waste gas, by the above-mentioned methanol waste gas recovery system based on smart adsorption tower, can realize methanol waste gas concentration < 20mg/m
3qualified discharge is (as " petro chemical industry pollutant emission standard " GB31571-2015 requires tail gas methanol concentration < 50mg/m
3).
(2) be described below based on each equipment connection in the methanol waste gas recovery system of smart adsorption tower:
1. the collecting pipe that gas (the methanol-air gaseous mixture from the process such as groove tank car or tank wagon entrucking emptying produces) is carried out at scene is connected with the combi inlet port of absorption tower lower body part.
2. the combi inlet port of exhaust outlet and the tail gas blow-down pipe of absorption tower top cover and adsorption tower A, adsorption tower B lower body part is connected.
3. the exhaust outlet of adsorption tower A, adsorption tower B top cover is connected with the combi inlet port of tail gas blow-down pipe, nitrogen inlet and smart adsorption tower C lower body part.
4. the exhaust outlet of smart adsorption tower C top cover is connected with tail gas blow-down pipe, nitrogen inlet.
5. adsorption tower A, adsorption tower B are connected with vavuum pump import with the combi inlet port of smart adsorption tower C lower body part.
6. vacuum pump outlet is connected with absorption tower.
7. water inlet is entered absorbing liquid mouth with top, absorption tower and is connected, and goes out absorbing liquid mouth and be connected with frequency conversion explosion proof unit fixed on water pump suction bottom absorption tower.
8. carry out gas collecting pipe to be connected with tail gas blow-down pipe.
(3) processing method based on the methanol waste gas recovery system of smart adsorption tower is:
1. scene is carried out gas (from the methanol-air gaseous mixture that the process such as groove tank car or tank wagon entrucking emptying produces, gas flow is 100 ~ 1500Nm
3/ h, gas temperature is normal temperature (environment temperature), and mist methanol concentration is 0.05 ~ 500g/m
3) utilize blower fan to guide to collecting pipe, through spark arrester, pressure sensor, temperature sensor, control valve, flowmeter, enter absorption tower from the combi inlet port the main body of absorption tower.This mist flows from bottom to top in absorption tower.Meanwhile, pure water by control valve, flowmeter to top, structured packing absorption tower, the methanol vapor of most of (70% ~ 90%) absorb by water.
2. from top, absorption tower out (be generally less than 70g/m containing a small amount of methanol vapor
3) and a small amount of steam (be generally less than 50g/m
3) tail gas through pressure sensor, temperature sensor, self-priming concentration air hatch, control valve, then the combi inlet port passed under adsorption tower A (or B) main body and by adsorption tower A (or B) absorption recycling.From adsorption tower A (or B) top gaseous mixture out through temperature sensor, pressure sensor, self-priming concentration air hatch, control valve, carry out degree of depth absorption by the combi inlet port under smart adsorption tower C main body and reclaim.Not by tail gas (air) (the concentration < 30mg/m adsorbed
3) exported through temperature sensor, pressure sensor, self-priming concentration air hatch, control valve, spark arrester by smart adsorption tower C top cover, enter tail gas blow-down pipe and enter air.
3. when the methanol concentration gathered at self-priming concentration air hatch from adsorption tower A (or B) top tail gas is out (as tail gas concentration > 50mg/m
3) when not meeting the demands, the control valve connected adsorption tower A (or B) main body upper and lower part by automatic control system is closed, and opens the control valve that adsorption tower B (or A) main body upper and lower part connects.
4. the methanol concentration gathered at self-priming concentration air hatch when the tail gas out from smart adsorption tower C top is (as tail gas concentration > 20mg/m
3) when not meeting the demands, the control valve that the control valve be connected with blow-down pipe by smart adsorption tower C body top by automatic control system and smart adsorption tower C lower body part are connected with adsorption tower A (or B) is closed, open the control valve that adsorption tower A (or B) is connected with blow-down pipe, make tail gas directly through control valve, spark arrester, enter tail gas blow-down pipe and enter air.
5. the water after absorbing methanol waste gas in absorption tower is delivered to owner by frequency conversion explosion proof water pump and is carried out water treatment.
When 6. stopping absorption work when adsorption tower A (or B) top tail gas does not out meet the demands, the control valve that adsorption tower A (or B) is connected with vavuum pump is opened by automatic control system, start vavuum pump, the adsorbent solution after absorption methyl alcohol is made to be drawn onto setting-up time (20 ~ 60min, concrete desorption time adjusts according to during debugging again, determine), the methanol waste gas separating sucking-off passes in absorption tower and is again only absorbed by the water, when vavuum pump runs last 5 ~ 10min, open the control valve that adsorption tower A (or B) is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump quits work, close the control valve that adsorption tower A (or B) is connected with vavuum pump, continue to pass into nitrogen until adsorption tower A (or B) interior pressure is normal pressure, close the control valve that adsorption tower A (or B) is connected with nitrogen pipeline.
When 7. stopping absorption work when smart adsorption tower C top tail gas does not out meet the demands, open control valve that smart adsorption tower C is connected with vavuum pump by automatic control system, start vavuum pump, the adsorbent solution after absorption methyl alcohol is made to be drawn onto setting-up time (the concrete desorption time of 10 ~ 30min adjusts according to during debugging again, determines), the methanol waste gas separating sucking-off passes in absorption tower and is again only absorbed by the water, when vavuum pump runs last 5 ~ 10min, open the control valve that smart adsorption tower C is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump quits work, close the control valve that smart adsorption tower C is connected with vavuum pump, continue to pass into nitrogen until pressure is normal pressure in smart adsorption tower C, close the control valve that smart adsorption tower C is connected with nitrogen pipeline, open control valve that smart adsorption tower C body top is connected with blow-down pipe and the control valve that smart adsorption tower C lower body part is connected with adsorption tower A (or B), close the control valve that adsorption tower A (or B) is connected with blow-down pipe.When whole system run to be in after a period of time not the activity duration time, the control valve of smart adsorption tower C main body upper and lower part connection is closed by automatic control system, open control valve that smart adsorption tower C is connected with vavuum pump, start vavuum pump, the adsorbent solution after absorption methyl alcohol is made to be drawn onto setting-up time (the concrete desorption time of 10 ~ 30min adjusts according to during debugging again, determines), when vavuum pump runs last 5 ~ 10min, open the control valve that smart adsorption tower C is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump quits work, close the control valve that smart adsorption tower C is connected with vavuum pump, continue to pass into nitrogen until pressure is normal pressure in smart adsorption tower C, close the control valve that smart adsorption tower C is connected with nitrogen pipeline, open the control valve that smart adsorption tower C main body upper and lower part connects.
Technique effect of the present invention is:
(1) the present invention adopts that " absorb+absorption " is integrated, efficient, the high efficiency methanol gas recovery method of minimum discharge concentration, in conjunction with two kinds of recovery method advantages, effectively overcomes adsorbent heat, and extend adsorbent service life, security is good.
(2) the present invention utilizes water to absorb methanol waste gas, and energy consumption is lower.
(3) adsorption tower of the present invention is set to two, can carry out automatic switchover absorption, ensure the continuity reclaimed.
(4) smart adsorption tower of the present invention, can make tail gas reach minimum discharge concentration, meets more harsh condition.
(5) in removal process, concentration, temperature, flow and pressure all carry out online acquisition, line analysis is stood in by data acquisition process and gas analytical work, instruct and when carry out gas collection, absorption and sorption and desorption operations, and utilize automatic controlling system gas collection, absorption and sorption and desorption operations.
Accompanying drawing explanation
Accompanying drawing 1 is based on the methanol waste gas recovery technology flow chart of smart adsorption tower
Reference numeral lists as follows:
1, 46-spark arrester, 2, 8, 12, 19, 21, 31, 42-pressure sensor, 3, 9, 17, 22, 32, 43-temperature sensor, 4, 5, 11, 13, 15, 23, 24, 25, 26, 28, 34, 35, 36, 37, 38, 39, 41, 45-control valve, 6-blower fan, 7-frequency conversion explosion proof water pump, 10, 16-flowmeter, 14-absorption tower, 18, 29, 30, 40-self-priming concentration air hatch, 20-vavuum pump, 27-adsorption tower A, 33-adsorption tower B, 44-smart adsorption tower C, 49, 51-ball valve, 50-liquid level gauge, 47-control system, 48-data acquisition process gas analysis work station.
Detailed description of the invention
Be described further below in conjunction with accompanying drawing 1 pair of embodiments of the invention, but the present invention is not by the restriction of embodiment:
Gas is carried out at scene, and (from the methanol-air gaseous mixture that the processes such as groove tank car or tank wagon entrucking emptying produce, gas flow is 500Nm
3/ h, gas temperature is normal temperature (environment temperature), and mist methanol concentration is 90g/m
3) be recovered after, require tail gas concentration < 20mg/m
3, utilize technical solution of the present invention to reclaim it, utilize accompanying drawing 1 to be described.
(1) the methanol waste gas recovery system based on smart adsorption tower comprises: blower fan 6, absorption tower 14, frequency conversion explosion proof water pump 7, adsorption tower A27, adsorption tower B33, essence adsorption tower C44, vavuum pump 20, automatic control system 47, data acquisition process gas analysis work station 48, flowmeter 10, 16, liquid level gauge 50, pressure sensor 2, 8, 12, 19, 21, 31, 42, temperature sensor 3, 9, 17, 22, 32, 43, control valve 4, 5, 11, 13, 15, 23, 24, 25, 26, 28, 34, 35, 36, 37, 38, 39, 41, 45, ball valve 49, 51, spark arrester 1, the accessory such as 46 and pipeline.
The blower fan 6 of the 1. described methanol waste gas recovery system based on smart adsorption tower is frequency conversion explosion proof blower fan.Blower fan 6, according to admission pressure size, carrys out variable frequency adjustment blower fan 6 rotating speed by pressure sensor 2, thus controls blower fan 6 absorbing quantity, and setting admission pressure is not less than-500Pa (gauge pressure).
Further, described blower fan 6 flow is: 1500Nm
3/ h.
Deployment tube groove type distributor in absorption tower 14 main body of the 2. described methanol waste gas recovery system based on smart adsorption tower, absorption tower 14 main body arranges liquid level gauge 50, temperature sensor 17 and pressure sensor 12 along absorption tower short transverse.
Further, described absorption tower 14 is highly 5m, and diameter is 0.8m.
Further, described absorption tower 14 inner absorbent is water.
Further, described coolant-temperature gage is 30 DEG C, and flow is 4t/h, and sprinkle density is 7.96m
3/ (m
2h).
Further, the liquid level of described liquid level gauge 50 controls the flow of frequency conversion explosion proof water pump 7, thus it is effectively moderate that guarantee is sprayed.
Further, described absorption equipment adsorption rate is 80%.
Adsorption tower A27, the adsorption tower B33 of the 3. described methanol waste gas recovery system based on smart adsorption tower, smart adsorption tower C44 main body arrange temperature sensor 22,32,43 and pressure sensor 21,31,42 along adsorption tower A27, adsorption tower B33, smart adsorption tower C44 short transverse.
Further, described adsorption tower A27, adsorption tower B33 are highly 3m, and diameter is 1m, and described smart adsorption tower C44 is highly 1m, and diameter is 0.5m.
Further, the adsorbent loaded in described adsorption tower A27, adsorption tower B33 is AdsFOV-II, and the adsorbent loaded in described smart adsorption tower C44 is AdsFOV-III.
The vavuum pump 20 of the 4. described methanol waste gas recovery system based on smart adsorption tower is frequency conversion explosion proof screw vacuum unit.
Further, described frequency conversion explosion proof screw vacuum unit vacuum is more than 95kPa.
The control system 47 of the 5. described methanol waste gas recovery system based on smart adsorption tower automatically controls the power-equipment of whole recovery system, to carry out gas collection, absorption and sorption and desorption operations in good time.
The data acquisition process of the 6. described methanol waste gas recovery system based on smart adsorption tower and gas analysis work station 48 be by on-line monitoring air hatch, absorption tower, in adsorption tower, in smart adsorption tower, the data such as the exhaust gas concentration of exhaust outlet determine absorption and sorption, desorption operations.
(2) be described below based on each equipment connection in the methanol waste gas recovery system of smart adsorption tower:
1. the collecting pipe that gas (the methanol-air gaseous mixture from the process such as groove tank car or tank wagon entrucking emptying produces) is carried out at scene is connected with the combi inlet port of absorption tower 14 lower body part.
2. the combi inlet port of exhaust outlet and the tail gas blow-down pipe of absorption tower 14 top cover and adsorption tower A27, adsorption tower B33 lower body part is connected.
3. the exhaust outlet of adsorption tower A27, adsorption tower B33 top cover is connected with the combi inlet port of tail gas blow-down pipe, nitrogen inlet and smart adsorption tower C44 lower body part.
4. the exhaust outlet of smart adsorption tower C44 top cover is connected with tail gas blow-down pipe, nitrogen inlet.
5. adsorption tower A27, adsorption tower B33 are connected with vavuum pump 20 import with the combi inlet port of smart adsorption tower C44 lower body part.
6. vavuum pump 20 outlet is connected with absorption tower 14.
7. water inlet is entered absorbing liquid mouth with top, absorption tower 14 and is connected, and goes out absorbing liquid mouth and be connected with frequency conversion explosion proof water pump 7 import bottom absorption tower 14.
8. carry out gas collecting pipe to be connected with tail gas blow-down pipe.
(3) processing method based on the methanol waste gas recovery system of smart adsorption tower is:
1. scene is carried out gas (from the methanol-air gaseous mixture that the process such as groove tank car or tank wagon entrucking emptying produces, gas flow is 500Nm
3/ h, gas temperature is normal temperature (environment temperature), and mist methanol concentration is 90g/m
3) utilize blower fan 6 to guide to collecting pipe, through spark arrester 1, pressure sensor 2, temperature sensor 3, control valve 5, pressure sensor 8, temperature sensor 9, flowmeter 10, enters absorption tower 14 from the combi inlet port the main body of absorption tower 14.This mist flows from bottom to top in absorption tower 14.Meanwhile, pure water by control valve 15, flowmeter 16 to top, structured packing absorption tower 14, the methanol vapor of 80% absorb by water.
2. from top, absorption tower 14 out (be generally less than 70g/m containing a small amount of methanol vapor
3) and a small amount of steam (be generally less than 50g/m
3) tail gas through pressure sensor 12, temperature sensor 17, self-priming concentration air hatch 18, control valve 28 (or 35), then the combi inlet port passed under adsorption tower A27 (or B33) main body and by adsorption tower A27 (or B33) absorption recycling.From adsorption tower A27 (or B33) top gaseous mixture out through temperature sensor 22 (or 32), pressure sensor 21 (or 31), self-priming concentration air hatch 29 (or 30), control valve 37 (or 38), carry out degree of depth absorption by the combi inlet port under smart adsorption tower C44 main body and reclaim.Not by tail gas (air) (the concentration < 20mg/m adsorbed
3) exported through temperature sensor 43, pressure sensor 42, control valve 41, spark arrester 46 by smart adsorption tower C44 top cover, enter tail gas blow-down pipe and enter air.
3. when the methanol concentration gathered self-priming concentration air hatch 29 (or 30) from adsorption tower A27 (or B33) top tail gas is out (as tail gas concentration > 50mg/m
3) when not meeting the demands, the control valve 35,38 (or 28,37) of adsorption tower B33 (or A27) main body upper and lower part connection will be opened by automatic control system 47, close the control valve 28,37 (or 35,38) that adsorption tower A27 (or B33) main body upper and lower part connects.
4. the methanol concentration gathered at self-priming concentration air hatch 40 when the tail gas out from smart adsorption tower C44 top is (as tail gas concentration > 20mg/m
3) when not meeting the demands, the control valve 37 (or 38) that the control valve 41 be connected with blow-down pipe by smart adsorption tower C44 body top by automatic control system 47 and smart adsorption tower C44 lower body part are connected with adsorption tower A27 (or B33) is closed, open the control valve 26 (or 36) that adsorption tower A27 (or B33) is connected with blow-down pipe, make tail gas directly through control valve 26 (or 36), spark arrester 46, enter tail gas blow-down pipe and enter air.
5. the water after absorbing methanol waste gas in absorption tower 14 is delivered to owner by frequency conversion explosion proof water pump 7 and is carried out water treatment.
When 6. stopping absorption work when adsorption tower A27 (or B33) top tail gas does not out meet the demands, open control valve 34 (or 39) that adsorption tower A27 (or B33) is connected with vavuum pump 20 by automatic control system 47, start vavuum pump 20, make the adsorbent desorb 30min after absorption methyl alcohol, the methanol waste gas separating sucking-off passes in absorption tower 14 and is again only absorbed by the water, when vavuum pump 20 runs last 5min, open the control valve 23 (or 24) that adsorption tower A27 (or B33) is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump 20 quits work, close the control valve 34 (or 39) that adsorption tower A27 (or B33) is connected with vavuum pump 20, continue to pass into nitrogen until adsorption tower A27 (or B33) interior pressure is normal pressure, close the control valve 23 (or 24) that adsorption tower A27 (or B33) is connected with nitrogen pipeline.
When 7. stopping absorption work when smart adsorption tower C44 top tail gas does not out meet the demands, open control valve 45 that smart adsorption tower C44 is connected with vavuum pump 20 by automatic control system 47, start vavuum pump 20, make the adsorbent desorb 20min after absorption methyl alcohol, the methanol waste gas separating sucking-off passes in absorption tower and is again only absorbed by the water, when vavuum pump 20 runs last 5min, open the control valve 25 that smart adsorption tower C44 is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump 20 quits work, close the control valve 45 that smart adsorption tower C44 is connected with vavuum pump 20, continue to pass into nitrogen until pressure is normal pressure in smart adsorption tower C44, close the control valve 25 that smart adsorption tower C44 is connected with nitrogen pipeline, open control valve 41 that smart adsorption tower C44 body top is connected with blow-down pipe and the control valve 37 (or 38) that smart adsorption tower C44 lower body part is connected with adsorption tower A27 (or B33), close the control valve 26 (or 36) that adsorption tower A27 (or B33) is connected with blow-down pipe.When whole system run to be in after a period of time not the activity duration time, the control valve 41,37 (or 38) of smart adsorption tower C44 main body upper and lower part connection is closed by automatic control system 47, open control valve 45 that smart adsorption tower C44 is connected with vavuum pump 20, start vavuum pump 20, make the adsorbent desorb 20min after absorption methyl alcohol, the methanol waste gas separating sucking-off passes in absorption tower and is again only absorbed by the water, when vavuum pump 20 runs last 5min, open the control valve 25 that smart adsorption tower C44 is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump 20 quits work, close the control valve 45 that smart adsorption tower C44 is connected with vavuum pump 20, continue to pass into nitrogen until pressure is normal pressure in smart adsorption tower C44, close the control valve 25 that smart adsorption tower C44 is connected with nitrogen pipeline, open the control valve 41,37 (or 38) that smart adsorption tower C44 main body upper and lower part connects.
Claims (10)
1. the methanol waste gas recovery system based on smart adsorption tower comprises: blower fan (6), absorption tower (14), frequency conversion explosion proof water pump (7), adsorption tower A (27), adsorption tower B (33), smart adsorption tower C (44), vavuum pump (20), automatic control system (47), data acquisition process gas analysis work station (48), flowmeter (10), (16), liquid level gauge (50), pressure sensor (2), (8), (12), (19), (21), (31), (42), temperature sensor (3), (9), (17), (22), (32), (43), control valve (4), (5), (11), (13), (15), (23), (24), (25), (26), (28), (34), (35), (36), (37), (38), (39), (41), (45), ball valve (49), (51), spark arrester (1), and the accessory such as pipeline (46).
2. the connection of each equipment of organic exhaust gas adsorption recovery system as claimed in claim 1, it is characterized in that: the collecting pipe that gas (the methanol-air gaseous mixture from the processes such as groove tank car or tank wagon entrucking emptying produce) is carried out at scene is connected with the combi inlet port of absorption tower (14) lower body part, the exhaust outlet of absorption tower (14) top cover and tail gas blow-down pipe and adsorption tower A (27), the combi inlet port of adsorption tower B (33) lower body part connects, adsorption tower A (27), the exhaust outlet of adsorption tower B (33) top cover and tail gas blow-down pipe, the combi inlet port of nitrogen inlet and smart adsorption tower C (44) lower body part connects, the exhaust outlet of essence adsorption tower C (44) top cover and tail gas blow-down pipe, nitrogen inlet connects, adsorption tower A (27), adsorption tower B (33) is connected with vavuum pump (20) import with the combi inlet port of smart adsorption tower C (44) lower body part, vavuum pump (20) outlet is connected with absorption tower (14), water inlet is entered absorbing liquid mouth with absorption tower (14) top and is connected, bottom, absorption tower (14) goes out absorbing liquid mouth and is connected with frequency conversion explosion proof water pump (7) import, carry out gas collecting pipe to be connected with tail gas blow-down pipe.
3. blower fan (6) as claimed in claim 1, it is characterized in that: blower fan (6) is frequency conversion explosion proof blower fan, according to admission pressure size, variable frequency adjustment blower fan (6) rotating speed is carried out by pressure sensor (2), thus controlling blower fan (6) absorbing quantity, general setting admission pressure is not less than-500Pa (gauge pressure).
4. absorption tower (14) as claimed in claim 1, it is characterized in that: pipe distributor, groove type distributor or tube and tank type distributor in absorption tower (14) main body, can be arranged, absorption tower (14) main body arranges liquid level gauge (50), temperature sensor (17) and pressure sensor (12) along absorption tower short transverse, absorption tower (14) height is determined according to treating capacity, be generally 1 ~ 15m, diameter is 0.5 ~ 2m.
5. absorption tower (14) as claimed in claim 1, it is characterized in that: the absorbent in absorption tower (14) is water, coolant-temperature gage < 35 DEG C, flow is 1 ~ 10t/h, and sprinkle density is 0.32 ~ 50.96m
3/ (m
2h), the Water spray density of absorption tower (14) controls the flow of frequency conversion explosion proof water pump (7) by the liquid level of liquid level gauge (50), thus it is effectively moderate that guarantee is sprayed.
6. adsorption tower A (27) as claimed in claim 1, adsorption tower B (33), essence adsorption tower C (44), it is characterized in that: adsorption tower A (27), adsorption tower B (33), along adsorption tower A (27) in essence adsorption tower C (44) main body, adsorption tower B (33), essence adsorption tower C (44) short transverse arranges temperature sensor (22), (32), and pressure sensor (21) (43), (31), (42), adsorption tower A (26), B (33) is highly 1 ~ 10m, diameter is 0.5 ~ 2.5m, essence adsorption tower C (44) is highly 0.5 ~ 8m, be directly 0.5 ~ 2m, adsorption tower A (26), adsorption tower B (33), the filling diameter of essence adsorption tower C (44) interior adsorbent and highly can being determined by calculating.
7. adsorption tower A (27), adsorption tower B (33), smart adsorption tower C (44) as claimed in claim 1, it is characterized in that: the adsorbent loaded in adsorption tower A (27), B (33) is the adsorbent being applicable to methanol waste gas, comprises active carbon, silica gel, dewatering silica gel, resin, zeolite, AdsFOV-II, Composite Adsorbent Absorbing agent.The adsorbent loaded in essence adsorption tower C (44) is AdsFOV-III.
8. vavuum pump (20) as claimed in claim 1, is characterized in that: vavuum pump (20) is dry vacuum pump, and vacuum is at more than 85kPa.
9. based on the recovery method of the methanol waste gas recovery system of smart adsorption tower, it is characterized in that: scene is carried out gas and utilized blower fan (6) to enter absorption tower (14) from the combi inlet port absorption tower (14) main body.This mist flows from bottom to top in absorption tower (14).Simultaneously, pure water is to structured packing absorption tower (14) top, and from absorption tower (14) top, the tail gas containing a small amount of methanol vapor and a small amount of steam out passes into combi inlet port adsorption tower A27 (or B33) main body and again by adsorption tower A27 (or B33) absorption recycling.Carry out degree of depth absorption from adsorption tower A27 (or B33) top gaseous mixture out by the combi inlet port smart adsorption tower C (44) main body to reclaim.Do not entered tail gas blow-down pipe by the tail gas (air) adsorbed by smart adsorption tower C (44) top cover outlet and enter air.
10. based on the adsorption tower desorption method of the methanol waste gas recovery system of smart adsorption tower, it is characterized in that: when adsorption tower A27 (or B33) top tail gas does not out meet the demands and stops absorption work, the control valve 34 (or 39) that adsorption tower A27 (or B33) is connected with vavuum pump (20) is opened by automatic control system (47), start vavuum pump (20), the adsorbent solution after absorption methyl alcohol is made to be drawn onto setting-up time (20 ~ 60min, concrete desorption time adjusts according to during debugging again, determine), the methanol waste gas separating sucking-off passes in absorption tower and is again only absorbed by the water, when vavuum pump 20 runs last 5 ~ 10min, open the control valve 23 (or 24) that adsorption tower A27 (or B33) is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump (20) quits work, close the control valve 34 (or 39) that adsorption tower A27 (or B33) is connected with vavuum pump (20), continue to pass into nitrogen until adsorption tower A27 (or B33) interior pressure is normal pressure, close the control valve 23 (or 24) that adsorption tower A27 (or B33) is connected with nitrogen pipeline.When essence adsorption tower C (44) top tail gas does not out meet the demands and stops absorption work, the control valve (45) that smart adsorption tower C (44) is connected with vavuum pump (20) is opened by automatic control system (47), start vavuum pump (20), the adsorbent solution after absorption methyl alcohol is made to be drawn onto setting-up time (10 ~ 30min, concrete desorption time adjusts according to during debugging again, determine), the methanol waste gas separating sucking-off passes in absorption tower and is again only absorbed by the water, when vavuum pump (20) runs last 5 ~ 10min, open the control valve (25) that smart adsorption tower C (44) is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump (20) quits work, close the control valve (45) that smart adsorption tower C (44) is connected with vavuum pump (20), continue to pass into nitrogen until smart adsorption tower C (44) interior pressure is normal pressure, close the control valve (25) that smart adsorption tower C (44) is connected with nitrogen pipeline, open control valve (41) that smart adsorption tower C (44) body top is connected with blow-down pipe and the control valve 37 (or 38) that smart adsorption tower C (44) lower body part is connected with adsorption tower A27 (or B33), close the control valve 26 (or 36) that adsorption tower A27 (or B33) is connected with blow-down pipe.When whole system run to be in after a period of time not the activity duration time, close in smart adsorption tower C (44) main body by automatic control system (47), the control valve 41 that bottom connects, 37 (or 38), open the control valve (45) that smart adsorption tower C (44) is connected with vavuum pump (20), start vavuum pump (20), the adsorbent solution after absorption methyl alcohol is made to be drawn onto setting-up time (10 ~ 30min, concrete desorption time adjusts according to during debugging again, determine), the methanol waste gas separating sucking-off passes in absorption tower and is again only absorbed by the water, when vavuum pump (20) runs last 5 ~ 10min, open the control valve (25) that smart adsorption tower C (44) is connected with nitrogen pipeline and automatically pass into nitrogen, promote desorb.After vavuum pump (20) quits work, close the control valve (45) that smart adsorption tower C (44) is connected with vavuum pump (20), continue to pass into nitrogen until smart adsorption tower C (44) interior pressure is normal pressure, close the control valve (25) that smart adsorption tower C (44) is connected with nitrogen pipeline, open the control valve 41,37 (or 38) that smart adsorption tower C (44) main body upper and lower part connects.
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