CN103071475A - Natural gas absorbent regeneration and energy conservation technology and device - Google Patents
Natural gas absorbent regeneration and energy conservation technology and device Download PDFInfo
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- CN103071475A CN103071475A CN2013100068461A CN201310006846A CN103071475A CN 103071475 A CN103071475 A CN 103071475A CN 2013100068461 A CN2013100068461 A CN 2013100068461A CN 201310006846 A CN201310006846 A CN 201310006846A CN 103071475 A CN103071475 A CN 103071475A
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Abstract
The invention relates to a natural gas absorbent regeneration and energy conservation technology and a natural gas absorbent regeneration and energy conservation device. The technology and the device can overcome the defects that the energy consumption is great and the heating time is long when the absorbent is regenerated. The technical scheme is as follows: a process of two towers is adopted, one tower is used for dehydration of natural gas and the other one is used for regeneration of natural gas. The two towers are switched for dehydration and regeneration of natural gas. During dehydration of natural gas, compressed natural gas first enters into the dehydration tower A to be dehydrated and obtain dried natural gas after being separated by a front filter separator, then the natural gas enters into a gas storage tank after being separated by a back filter separator; during heating and regeneration of absorbent, after flow reduction and depressurization, the regenerated natural gas is first heated in a heat exchanger and a heater and enters into the dehydration tower B to regenerate the absorbent, then, the natural gas enters into the heat exchanger to be cooled, and finally the natural gas enters into a recovery tank after being separated by a condensation separator; and during cold blowing and regeneration of the absorbent, after flow reduction and depressurization, the regenerated natural gas enters into the dehydration tower B to cold blow and reduce the temperature of the absorbent. According to the technology, complementary utilization of energy is achieved, energy consumption in absorbent regeneration is reduced, and energy-saving operation of the device is realized.
Description
Technical field
The present invention relates to a kind ofly for gas industry natural gas be dewatered and natural gas adsorbent regenerating energy-saving technique and the device of adsorbent reactivation.
Background technology
The compressed natural gas used as vehicle fuel water dew point should meet the regulation of GB18047, and dewater unit is the visual plant of finishing the compressed natural gas used as vehicle fuel dehydration, and is most important to the control of water dew point.The compressed natural gas used as vehicle fuel dewatering type should adopt the absorption method dehydration at present, and adsorbent should adopt 4A type or 3A type molecular sieve.Simultaneously, for guaranteeing that gas station moves continuously, need two towers or multitower dewater unit alternately operating, during the operation of two tower dewater units, a tower carries out dehydrating operations, and another tower carries out desorption and regeneration and cooling, then handover operation.In three towers or multitower flow process, be subjected to the factor affecting changeover program such as feed conditions that multiple choices can be arranged, for example three-column process flow can adopt the handover operation of tower absorption, tower regeneration, another tower cooler or the absorption of two towers, tower regeneration and cooling.
The dewater unit technological process of compressed natural gas used as vehicle fuel comprises gas dehydration operation and adsorbent reactivation operation.The dehydrating operations flow process is: the high-pressure natural gas after the supercharging enters from dehydrating tower top air inlet after front filter separator separates, fully contact with the adsorbent in the dehydrating tower, contained moisture and the part hydrocarbon of adsorbent absorption high-pressure natural gas, then discharge from the base bleed mouth of dehydrating tower, enter subsequently the after-filter separator and filter, finally by storage and the aerating of sequential control dish control compressed natural gas.The regenerative operation flow process is: after being heated to the needed temperature of adsorbent reactivation as regeneration gas (generally the using dry natural gas) heater via of adsorbent reactivation, bottom by dehydrating tower enters, the adsorbent bed heating that contacts with adsorbent of flowing through, rising along with temperature, adsorbent moisture and part hydrocarbon are reproduced the band of gas and walk, finish the regeneration of adsorbent, thereby reach the regeneration purpose of adsorbent; Simultaneously, dehydrating tower need be cooled to normal temperature to satisfy the dehydrating operations to natural gas after adsorbent reactivation was finished.Have at present and adopt the nature cooling and pass into the mode that regeneration gas purges adsorbent, but adopt the latter's cooling method more.When adsorbent temperature is reduced to normal temperature, stop to pass into regeneration gas, adsorbent recovers water separation capability, thereby satisfies the dehydrating function of natural gas.The regeneration gas of discharging from dehydrating tower simultaneously, enters the natural gas recycling can and prepares again compression after refrigerated separation.
In the adsorbent reactivation operating process, because the pressure rating of heater is generally lower, need the regeneration gas reducing pressure by regulating flow to satisfy the pressure rating of heater.Known by Joule-Thomson effect, the regeneration gas temperature behind reducing pressure by regulating flow is generally very low.Known by dewater unit regenerative operation flow process, enter the regeneration that dehydrating tower is finished adsorbent after the regeneration gas heater via heating behind the reducing pressure by regulating flow, discharge from the dehydrating tower top subsequently, enter recycling can through after the refrigerated separation.Have unreasonable part: the regeneration gas that discharge from the dehydrating tower top (1) has been carried amount of heat, its cooling is needed to consume a large amount of cooling waters, increased the energy consumption of cooling, if cool off bad simultaneously, be unfavorable for gas-liquid separation, affect separating effect, regeneration gas enters the temperature that has also improved recycling can behind the recycling can; (2) the regeneration gas temperature behind the reducing pressure by regulating flow is low, so that the inlet temperature of heating furnace is low, causes heat time heating time long, and energy consumption is large, is unfavorable for energy-saving run.
Summary of the invention
The objective of the invention is in order to overcome dewater unit adsorbent reactivation process energy consumption large, gas consumption is large, heat time heating time is long, the halfway problem of regenerating, the spy provides a kind of natural gas adsorbent regenerating energy-saving technique and device, by the cold behind regeneration gas (generally the using dry natural gas) reducing pressure by regulating flow and the heat heat exchange of finishing regeneration gas behind the desorption, make that cold air heats up, the hot gas cooling, realize the complementation utilization of energy; With the direct cold blowing dehydrating tower of the regeneration gas of lower temperature behind the reducing pressure by regulating flow, realize the fast cooling of dehydrating tower, reach the dual purpose that dewater unit is energy-saving and cost-reducing and optimize dehydration and regeneration effect.
The objective of the invention is to be achieved through the following technical solutions.A kind of natural gas adsorbent regenerating energy-saving technique comprises gas dehydration operation and adsorbent reactivation operation, and wherein the adsorbent reactivation operation comprises again adsorbent thermal regeneration and adsorbent cold blowing regeneration; Adopt two tower flow processs, a tower carries out the gas dehydration operation, and another tower carries out adsorbent reactivation operation, then handover operation; Gas dehydration operation: open first that A is high to advance valve and A exceeds valve, close that B is high to advance valve and B exceeds valve, be that the compressed natural gas of 20MPa～25MPa is after front filter separator separates with pressure, advance valve and enter in the tower from A dehydrating tower top through A is high, obtain dry natural gas with its moisture of the abundant Contact-sorption of adsorbent and part hydrocarbon, adsorbent adopts 4A type molecular sieve; Then discharge from the bottom of A dehydrating tower, after A exceeds valve and enters, enter air accumulator behind the filter separator separating part solid particle and store, finish the deep dehydration of compressed natural gas; After the dehydration of A dehydrating tower is saturated, switches and use the B dehydrating tower; Adsorbent reactivation operation: open the heat exchanger open valve during thermal regeneration, B heat is advanced valve, B heat goes out valve, close the heat exchanger shut off valve, A heat is advanced valve, A heat goes out valve, be that the dry natural gas of 20MPa～25MPa is as the regeneration gas of adsorbent with pressure, regeneration gas obtains pressure behind regeneration gas pressure regulator valve reducing pressure by regulating flow be 0.5MPa～1.2MPa, temperature is-15 ℃～-4 ℃ low-temp low-pressure regeneration gas, with entering the heat exchanger shell pass heat exchange by the heat exchanger open valve, to the regeneration gas preheating, regeneration gas heater via after the preheating is heated to 200 ℃～315 ℃ and advances valve by B heat and enter in the tower from the bottom of B dehydrating tower adsorbent is carried out desorption, the regeneration gas of finishing behind the desorption is discharged from the top of B dehydrating tower, go out valve through B heat and enter heat exchanger tube pass heat exchange realization cooling, and by entering recycling can after the condensation separator refrigerated separation; Close heat exchanger open valve, heater during cold blowing regeneration, open the heat exchanger shut off valve, obtaining pressure and be 0.5MPa～1.2MPa, temperature behind the pressure regulator valve reducing pressure by regulating flow and be-15 ℃～-4 ℃ low-temp low-pressure regeneration gas advances valve through heat exchanger shut off valve and B heat and directly enters in the tower from the bottom of B dehydrating tower, to the adsorbent cold blowing cooling of B dehydrating tower, the regeneration gas of discharging from B dehydrating tower top enters recycling can after B heat goes out valve, heat exchanger, condensation separator; When the temperature of adsorbent is lower than 50 ℃, stop cold blowing, finish the regeneration of adsorbent, prepare to fall tower to gas dehydration next time; Opening subsequently blowoff valve discharges in the heat exchanger because the condensate that the pressure, temperature variation of regeneration gas is separated out.
The employed device of a kind of natural gas adsorbent regenerating energy-saving technique, by forward and backward filter separator, dehydrating tower, air accumulator, heat exchanger, heater, condensation separator, recycling can and valve form, it is characterized in that: this dewater unit adopts Double-Tower Structure, front filter separator top outlet and A be high to advance that valve and B are high to be advanced valve and be connected in parallel, and A is high to be advanced the valve outlet port pipeline and be connected to A dehydrating tower top, and B is high to be advanced the valve outlet port pipeline and be connected to B dehydrating tower top; Be connected in series with between A dehydrating tower top inlet line and B dehydrating tower top inlet line that A heat goes out valve and B heat goes out valve, two A, B heat go out the tube side import that connects heat exchanger between valve with pipeline, the heat exchanger tube pass outlet line connects condensation separator, and the condensation separator outlet line connects recycling can; The A dehydrating tower is connected with the B dehydrating tower between the pipeline of bottom and is connected that A exceeds valve and B exceeds valve, and the outlet line that two A, B exceed valve is connected to rear filter separator bottom, and rear filter separator top outlet line connects air accumulator; Regeneration gas pressure regulator valve outlet line is connected in parallel to heat exchanger open valve and heat exchanger shut off valve, the heat exchanger open valve is connected with the shell side import of heat exchanger, the bottom righthand side of heat exchanger shell pass connects blowoff valve, the shell side outlet of heat exchanger connects heater, advancing valve with A heat after heater outlet and the parallel connection of heat exchanger shut off valve outlet line is connected the valve import with B heat and is connected, A heat is advanced the bottom outlet that valve outlet port is connected to the A dehydrating tower, and B heat is advanced the bottom outlet that valve outlet port connects the B dehydrating tower.
The present invention has following beneficial effect: the regeneration gas that (1) finishes adsorbent reactivation enters recycling can, has avoided the waste of regeneration gas; (2) to the preheating of low-temp low-pressure regeneration gas, improved the inlet temperature of heater, shortened heat time heating time, reduced the power consumption of heater; (3) shorten the heat time heating time that thermal regeneration operates, reduced the consumption of regeneration gas; (4) the high temperature regeneration gas of dehydrating tower discharge is cooled, and has reduced the condensation separator inlet temperature, is conducive to the separation of separator, has also reduced the temperature that enters recycling can simultaneously; (5) the direct cold blowing adsorbent of the low-temp recovery gas behind the reducing pressure by regulating flow, cooling rate is fast; (6) the complementation utilization of energy greatly reduces the energy consumption of dewater unit, is conducive to the energy conservation economic operation of dewater unit.
Description of drawings
Fig. 1 is the structural representation of natural gas adsorbent regenerating energy-saving technique of the present invention institute operative installations
Among the figure: 1. front filter separator; 2.A height advances valve; 3.A dehydrating tower; 4.A exceed valve; 5. rear filter separator; 6. air accumulator; 7. regeneration gas pressure regulator valve; 8. heat exchanger open valve; 9. heat exchanger shut off valve; 10. heat exchanger; 11. heater; 12.B heat is advanced valve; 13.B heat goes out valve; 14. condensation separator; 15. recycling can; 16.B height advances valve; 17.B dehydrating tower; 18.B exceed valve; 19.A heat is advanced valve; 20.A heat goes out valve; 21. blowoff valve.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
The present invention adopts two tower dewatering process flows, the alternate run during operation of gas dehydration operation and adsorbent reactivation in actual production, and a tower carries out the gas dehydration operation, and another tower carries out adsorbent reactivation and operates, then handover operation.With A dehydrating tower 3 dewater, B dehydrating tower 17 is regenerated, and the present invention is described in detail.
Gas dehydration operation: open first that A is high to advance valve 2 and A exceeds valve 4, close that B is high to advance valve 16 and B exceeds valve 18, be that the compressed natural gas of 20MPa～25MPa is after front filter separator 1 separates with pressure, advance valve 2 and enter in the tower from A dehydrating tower 3 tops through A is high, obtain dry natural gas with its moisture of the abundant Contact-sorption of adsorbent and part hydrocarbon, adsorbent adopts 4A type molecular sieve; Then discharge from the bottom of A dehydrating tower 3, after A exceeds valve 4 and enters, enter air accumulator 6 behind the filter separator 5 separating part solid particles and store, finish the deep dehydration of compressed natural gas; After 3 dehydrations of A dehydrating tower are saturated, switch and use B dehydrating tower 17.
Adsorbent reactivation operation: open heat exchanger open valve 8 during thermal regeneration, B heat is advanced valve 12, B heat goes out valve 13, close heat exchanger shut off valve 9, A heat is advanced valve 19, A heat goes out valve 20, be that the dry natural gas of 20MPa～25MPa is as the regeneration gas of adsorbent with pressure, regeneration gas obtains pressure behind regeneration gas pressure regulator valve 7 reducing pressure by regulating flows be 0.5MPa～1.2MPa, temperature is-15 ℃～-4 ℃ low-temp low-pressure regeneration gas, with enter heat exchanger 10 shell side heat exchange by heat exchanger open valve 8, to the regeneration gas preheating, regeneration gas heater via 11 after the preheating is heated to 200 ℃～315 ℃ and advances valve 12 by B heat and enter in the tower from the bottom of B dehydrating tower 17 adsorbent is carried out desorption, the regeneration gas of finishing behind the desorption is discharged from the top of B dehydrating tower 17, go out valve 13 through B heat and enter heat exchanger 10 tube side heat exchange realization cooling, and by entering recycling can 15 after condensation separator 14 refrigerated separation.Close heat exchanger open valve 8, heater 11 during cold blowing regeneration, open heat exchanger shut off valve 9, obtaining pressure and be 0.5MPa～1.2MPa, temperature behind pressure regulator valve 7 reducing pressure by regulating flows and be-15 ℃～-4 ℃ low-temp low-pressure regeneration gas advances valve 12 through heat exchanger shut off valve 9 and B heat and directly enters in the tower from the bottom of B dehydrating tower 17, to the adsorbent cold blowing cooling of B dehydrating tower 17, the regeneration gas of discharging from B dehydrating tower 17 tops enters recycling can 15 after B heat goes out valve 13, heat exchanger 10, condensation separator 14; When the temperature of adsorbent is lower than 50 ℃, stop cold blowing, finish the regeneration of adsorbent, prepare to fall tower to gas dehydration next time; Opening subsequently blowoff valve 21 discharges in the heat exchanger because the condensate that the pressure, temperature variation of regeneration gas is separated out.
Device used in the present invention, by forward and backward filter separator, dehydrating tower, air accumulator, heat exchanger, heater, condensation separator, recycling can and valve form, it is characterized in that: this dewater unit adopts Double-Tower Structure, front filter separator 1 top outlet and A be high to advance that valve 2 and B are high to be advanced valve 16 and be connected in parallel, and A is high to be advanced valve 2 outlet lines and be connected to A dehydrating tower 3 tops, and B is high to be advanced valve 16 outlet lines and be connected to B dehydrating tower 17 tops; Being connected in series with A heat between A dehydrating tower 3 top inlet line and B dehydrating tower 17 top inlet line goes out valve 20 and goes out valve 13 with B heat, two A, B heat go out valve 20,13 tube side imports that connect heat exchanger 10 with pipeline, heat exchanger 10 tube side outlet lines connect condensation separator 14, and condensation separator 14 outlet lines connect recycling can 15; Connect A between A dehydrating tower 3 and bottom pipeline that the B dehydrating tower is connected and exceed valve 4 and B and exceed that valve 18, two A, B exceed valve 4,18 outlet line is connected to rear filter separator 5 bottoms, rear filter separator 5 top outlet lines connect air accumulators 6; Regeneration gas pressure regulator valve 7 outlet lines are connected in parallel to heat exchanger open valve 8 and heat exchanger shut off valve 9, heat exchanger open valve 8 is connected with the shell side import of heat exchanger 10, the bottom righthand side of heat exchanger 10 shell sides connects blowoff valve 21, the shell side outlet of heat exchanger 10 connects heater 11, advancing valve 19 with A heat after heater 11 outlet and the 9 outlet line parallel connections of heat exchanger shut off valve is connected valve 12 imports and is connected with B heat, A heat is advanced the bottom outlet that valve 19 outlets are connected to A dehydrating tower 3, and B heat is advanced the bottom outlet that valve 12 outlets connect B dehydrating tower 17.
Claims (2)
1. a natural gas adsorbent regenerating energy-saving technique comprises gas dehydration operation and adsorbent reactivation operation, and wherein the adsorbent reactivation operation comprises again adsorbent thermal regeneration and adsorbent cold blowing regeneration; Adopt two tower flow processs, a tower carries out the gas dehydration operation, and another tower carries out adsorbent reactivation operation, then handover operation; Gas dehydration operation: open first that A is high to advance valve (2) and A exceeds valve (4), close that B is high to advance valve (16) and B exceeds valve (18), be that the compressed natural gas of 20MPa～25MPa is after front filter separator (1) separates with pressure, advance valve (2) and enter in the tower from A dehydrating tower (3) top through A is high, obtain dry natural gas with its moisture of the abundant Contact-sorption of adsorbent and part hydrocarbon, adsorbent adopts 4A type molecular sieve; Then discharge from the bottom of A dehydrating tower (3), after A exceeds valve (4) and enters, enter air accumulator (6) behind filter separator (5) the separating part solid particle and store, finish the deep dehydration of compressed natural gas; After A dehydrating tower (3) dehydration is saturated, switches and use B dehydrating tower (17); Adsorbent reactivation operation: open heat exchanger open valve (8) during thermal regeneration, B heat is advanced valve (12), B heat goes out valve (13), close heat exchanger shut off valve (9), A heat is advanced valve (19), A heat goes out valve (20), be that the dry natural gas of 20MPa～25MPa is as the regeneration gas of adsorbent with pressure, regeneration gas obtains pressure behind regeneration gas pressure regulator valve (7) reducing pressure by regulating flow be 0.5MPa～1.2MPa, temperature is-15 ℃～-4 ℃ low-temp low-pressure regeneration gas, with enter heat exchanger (10) shell side heat exchange by heat exchanger open valve (8), to the regeneration gas preheating, regeneration gas heater via (11) after the preheating is heated to 200 ℃～315 ℃ and advances valve (12) by B heat and adsorbent is carried out desorption in entering tower from the bottom of B dehydrating tower (17), the regeneration gas of finishing behind the desorption is discharged from the top of B dehydrating tower (17), go out valve (13) through B heat and enter heat exchanger (10) tube side heat exchange realization cooling, and by entering recycling can (15) after condensation separator (14) refrigerated separation; Close heat exchanger open valve (8) during cold blowing regeneration, heater (11), open heat exchanger shut off valve (9), obtaining pressure behind pressure regulator valve (7) reducing pressure by regulating flow is 0.5MPa～1.2MPa, temperature is that-15 ℃～-4 ℃ low-temp low-pressure regeneration gas is advanced valve (12) through heat exchanger shut off valve (9) and B heat and directly entered in the tower from the bottom of B dehydrating tower (17), to the adsorbent cold blowing cooling of B dehydrating tower (17), the regeneration gas of discharging from B dehydrating tower (17) top goes out valve (13) through B heat, heat exchanger (10), enter recycling can (15) behind the condensation separator (14); When the temperature of adsorbent is lower than 50 ℃, stop cold blowing, finish the regeneration of adsorbent, prepare to fall tower to gas dehydration next time; Opening subsequently blowoff valve (21) discharges in the heat exchanger because the condensate that the pressure, temperature variation of regeneration gas is separated out.
2. employed device of natural gas adsorbent regenerating energy-saving technique, by forward and backward filter separator, dehydrating tower, air accumulator, heat exchanger, heater, condensation separator, recycling can and valve form, it is characterized in that: this dewater unit adopts Double-Tower Structure, front filter separator (1) top outlet and A be high to advance that valve (2) and B are high to be advanced valve (16) and be connected in parallel, and A is high to be advanced valve (2) outlet line and be connected to A dehydrating tower (3) top, and B is high to be advanced valve (16) outlet line and be connected to B dehydrating tower (17) top; Being connected in series with A heat between A dehydrating tower (3) top inlet line and B dehydrating tower (17) top inlet line goes out valve (20) and B heat and goes out valve (13), two A, B heat go out the tube side import that connects heat exchanger (10) between valve (20,13) with pipeline, heat exchanger (10) tube side outlet line connects condensation separator (14), and condensation separator (14) outlet line connects recycling can (15); A dehydrating tower (3) is connected 17 with the B dehydrating tower) the bottom pipeline between connect that A exceeds valve (4) and B exceeds valve (18), the outlet line that two A, B exceed valve (4,18) is connected to rear filter separator (5) bottom, and rear filter separator (5) top outlet line connects air accumulator (6); Regeneration gas pressure regulator valve (7) outlet line is connected in parallel to heat exchanger open valve (8) and heat exchanger shut off valve (9), heat exchanger open valve (8) is connected with the shell side import of heat exchanger (10), the bottom righthand side of heat exchanger (10) shell side connects blowoff valve (21), the shell side outlet of heat exchanger (10) connects heater (11), advancing valve (19) with A heat after heater (11) outlet and heat exchanger shut off valve (9) the outlet line parallel connection is connected valve (12) import and is connected with B heat, A heat is advanced the bottom outlet that valve (19) outlet is connected to A dehydrating tower (3), and B heat is advanced the bottom outlet that valve (12) outlet connects B dehydrating tower (17).
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| CN104745261A (en) * | 2015-04-10 | 2015-07-01 | 青岛捷能高新技术有限责任公司 | High-pressure molecular sieve circulating dehydration system and method |
| CN104745240A (en) * | 2015-03-23 | 2015-07-01 | 七台河宝泰隆煤化工股份有限公司 | Process for adsorbing and regenerating adsorbent |
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