CN101797465B - Pressure-reduction zero-emission energy-saving gas dewatering device - Google Patents
Pressure-reduction zero-emission energy-saving gas dewatering device Download PDFInfo
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- CN101797465B CN101797465B CN2010101047492A CN201010104749A CN101797465B CN 101797465 B CN101797465 B CN 101797465B CN 2010101047492 A CN2010101047492 A CN 2010101047492A CN 201010104749 A CN201010104749 A CN 201010104749A CN 101797465 B CN101797465 B CN 101797465B
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Abstract
The invention relates to a pressure-reduction zero-emission energy-saving gas dewatering device which is adapted to a middle or high pressure (>2.0Mpa) double-tower or multi-tower molecular sieve dewatering process and comprises a filter (1), two or a plurality of drying/absorption towers (2A and 2B), an air cooler (3), a gas-water separator (4), a circulating fan (5), an electric heater (6), a gas-gas heat exchanger (8) and a frequency transformer (12). The invention is characterized in that a regeneration discharge branch path is branched at an air outlet of the circulating fan, and the regeneration discharge branch is merged into an adsorption air inlet pipe. Thus, dry gas discharged by a regeneration loop is extracted and discharged into an absorption loop when in regeneration, so that a regeneration tower is depressurized, and the regeneration loop is restored through the switching of a valve after pressure reduction. Thus, not only pressure-reduction regeneration is realized, but also zero emission is realized, and the regeneration time is reduced, thereby reducing the energy consumption and prolonging the service life of a molecular sieve.
Description
Technical field
The present invention relates to a kind of from mist (natural gas, coal bed gas, oil field gas, oven gas, coal gas, CO gas during carbon back is synthetic, H in the petrochemical industry
2Gas, food-class CO
2Deng) in remove the gas dewatering device of water, particularly a kind of energy-saving gas dewatering device of pressure-reduction zero-emission.It is applicable to middle and high pressure (＞2.0Mpa) double tower or multitower molecular sieve adsorbing and dewatering technology.
Background technology
At present, the normal double-column process technology that adopts a kind of isobaric zero-emission in the processed industry of mist (as: natural gas).During work, tower absorption, another tower regeneration, after absorption was saturated, adsorption tower transferred regeneration immediately to, and regenerator transfers absorption immediately to, and dehydration is carried out continuously.Wherein the absorbing process employing is the molecular sieve adsorption flow process, and what regeneration technology adopted is hot regeneration technology flow process, and it makes the molecular sieve that is filled moisture obtain desorb with the method for thermal evaporation.Referring to Fig. 2; Its adsorption process is: mist gets into the tower from the cat head of adsorption tower 200A through valve 10A from air inlet pipe 900 through the filtration of filter 100, discharges from the tower still through the molecular sieve in the tower again; Mist is through molecular sieve the time; Moisture wherein is adsorbed, and can satisfy the dehydration requirement, and the gas of discharging from the tower still goes out device through valve 30A, escape pipe 1100 and filter 700.The regeneration technology flow process is: drying tower 200B uses the extraneous mist of sending here that has dewatered (or moisture trap 400 come out dry gas) through the heat temperature raising of electric heater 600, to get into the tower from the tower still of drying tower 200B through valve 40B, makes the water evaporates of molecular sieve adsorption in the tower and takes out of; Evaporate the damp-heat that and discharge from cat head, get into gas/gas heat exchanger 800 through valve 20B, the cold dry gas that comes out with moisture trap 400 changes cold cooling; Get into air cooler 300 then and continue cooling, make the moisture content in the gas be condensed into droplet, pass through the gas-water separation of moisture trap 400 again; With condensed from and discharge, fixed gas is through the pressurization of circulating fan 500, gets into gas/gas heat exchanger 800; After the hot and humid gas heat exchange of coming out with drying tower 200B cat head heats up, get into electric heater 600, through the heating of electric heater 600; After making gas temperature reach the temperature requirement of molecular sieve desorb, get into drying tower 200B, form circulation through valve 40B; Constantly circulation, the moisture in the molecular sieve is by desorb.
Above-mentioned technological process is a kind of isobaric technique of zero discharge flow process, i.e. absorption is identical with the pressure of desorb, and non-exhaust emission.This isobaric technique of zero discharge only is applicable to conventional pressure (20kPa) operating mode, but for the adsorptive pressure (greater than 2.0MPa) of middle and high pressure, if still adopt isobaric desorb; It is a lot (because pressure is high more that desorption temperature is raise; The boiling temperature of water is high more), this not only can increase energy consumption, also can reduce the service life of molecular sieve; And can make desorption time long; If desorption time is long, also need increases absorption or drying tower and come equilibrium adsorption and desorption time, thereby cause that investment increases.Therefore, how in zero-emission, can step-down regeneration be the problem that needs solution at present again.
Summary of the invention
The objective of the invention is provides a kind of energy-saving gas dewatering device that is applicable to the pressure-reduction zero-emission of middle and high pressure absorption working condition to the problem that exists in the prior art, saves the energy and prolongs the molecular sieve purpose in service life thereby reach.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
It is made up of two or more drying/adsorption towers, air cooler, moisture trap, circulating fan, electric heater, gas/gas heat exchanger at least; The cat head fairlead of said each drying/adsorption tower is divided into two-way; The valve of leading up to is incorporated the charging tracheae into; Another road is also incorporated the total fairlead of cat head into through a valve, and the hot gas air inlet pipe of total fairlead of described cat head and gas/gas heat exchanger is joined, and the hot gas escape pipe of gas/gas heat exchanger and the air inlet pipe of air cooler are joined; The escape pipe of said air cooler and the air inlet pipe of moisture trap are joined, and the escape pipe of said moisture trap and the air inlet pipe of circulating fan are joined; The tower still fairlead of said each drying/adsorption tower also is divided into two-way; The valve of leading up to is incorporated the discharging tracheae into; The escape pipe of electric heater is also incorporated on another road into through a valve, the cold air escape pipe of the air inlet pipe of heater and gas/gas heat exchanger joins, and its improvement structure is: the escape pipe of said circulating fan is divided into two-way; The cold air air inlet pipe of a valve and gas/gas heat exchanger of leading up to is joined, and another road is also incorporated the charging tracheae into through a valve.
The further improved technical scheme of the present invention is following:
On the described circulating fan frequency converter is housed.
Can find out that through technique scheme the present invention pays a regeneration discharge branch road in the punishment of the gas outlet of circulating fan, and incorporates this regeneration discharge branch road into the absorption air inlet pipe.Like this, the dry gas pressurization that can when regeneration, regenerative circuit be discharged is extracted out and is discharged to the absorption loop, makes the regenerator step-down after the step-down, through the switching of valve, to recover regenerative circuit again.Like this, both realized step-down regeneration, realized zero-emission again, thereby reduced energy consumption, and also avoided making the molecular sieve lost of life, prolonged the service life of molecular sieve because of regeneration temperature is too high.The present invention realizes that further the scheme of top-operation is on circulating fan, to add frequency converter; When the regeneration beginning, make circulating fan quicken the gas in the regenerative circuit is extracted out through VFC; Realize step-down, and after the regenerative circuit step-down, control circulating fan again to run slowly; Entering regular regeneration circulation, thus the recovery time reduced.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of isobaric zero-emission double tower molecular sieve gas dewatering device.
The specific embodiment
Still double-column process is the structure and the operation principle of this device of example explanation below.
Referring to Fig. 1; It comprises that the cat head fairlead of two dryings/ adsorption tower 2A, 2B, air cooler 3, moisture trap 4, circulating fan 5, electric heater 6 gentle/8, two dryings of gas heat exchanger/ adsorption tower 2A, 2B is divided into two-way, and the first via of tower 2A is incorporated charging tracheae 9 into through valve 1A; The first via of tower 2B is also incorporated charging tracheae 9 into through valve 1B; The second tunnel of tower 2A incorporates the total fairlead 10 of cat head into through valve 2A, and the second tunnel of tower 2B incorporates total fairlead 10 into through valve 2B, and the total fairlead 10 of described cat head joins with the hot gas air inlet pipe of gas/gas heat exchanger 8; The hot gas escape pipe of gas/gas heat exchanger and the air inlet pipe of air cooler 3 are joined; The air inlet pipe of the escape pipe of said air cooler and moisture trap 4 is joined, and the air inlet pipe of the escape pipe of said moisture trap 4 and circulating fan 5 is joined, and the escape pipe of said circulating fan 5 is divided into two-way; The cold air air inlet pipe of valve 7A and gas/gas heat exchanger 8 of leading up to is joined, and another road is incorporated charging tracheae 9 into through valve 7B; The tower still fairlead of two drying/ adsorption tower 2A, 2B also is divided into two-way; The first via of tower 2A is incorporated discharging tracheae 11 into through valve 3A; The first via of tower 2B is incorporated discharging tracheae 11 into through valve 3B; The second tunnel of tower 2A incorporates the escape pipe of electric heater 6 into through valve 4A, and the second tunnel of tower 2B incorporates the escape pipe of electric heater 6 into through valve 4B, and the cold air escape pipe of the air inlet pipe of heater 6 and gas/gas heat exchanger 8 joins.
On the described circulating fan 5 frequency converter 12 is housed, changes the rotating speed of circulating fan 5, make its quick rotation when the regeneration beginning through the change of frequency of controlling this frequency converter; Discharge gas fast; Make the quick step-down of regenerator, when recovering regular regeneration, slow down again; Make circulating fan output normal circulation thrust, further energy-conservation.
The workflow of this device is following:
Suppose device is in the state of tower 2A absorption, tower 2B regeneration, then opens cat head valve 1A, 2B, closes cat head valve 1B, 2A; Open tower still valve 3A, 4B, close tower still valve 4A, 3B;
In adsorption process, mist filters through filter 1, and wherein droplet is filtered; Get into tower 2A through valve 1A then; Gas passes the molecular sieve in the tower, makes moisture in the gas by molecular sieve adsorption, comes out from the tower still then; Go out device through valve 3A and filter 13, accomplish adsorption process.
When the regeneration beginning, valve 7B opens, and valve 7A closes, at this moment; The damp-heat that tower 2B cat head comes out becomes cold dry gas after through valve 2B, gas/gas heat exchanger 8, air cooler 3, moisture trap 4, and then by circulating fan 5 frequency conversions pressurization, quicken to enter charging tracheae 9 through valve 7B, the feed gas of this gas that enters in the charging tracheae passes through discharger behind the adsorption tower 2A, and constantly circulation is discharged; Pressure among the drying tower 2B is descended, and when pressure dropped to the pressure that the molecular sieve desorb is fit to (and require with reference to energy consumption), soon valve 7B closed, and valve 7A is opened; Simultaneously, circulating fan 5 frequency conversions are slowed down, with all speed operations of speed that can promote gas circulation, at this moment; The damp-heat that tower 2B cat head is discharged gets into heat exchanger 8 through valve 2B, and the cold dry gas that comes out with circulating fan changes cold, and this is equivalent to before air cooling, carry out a precooling; Get into air cooler 3 coolings then, after the cooling, the moisture content in the damp-heat is condensed into droplet; Pass through the separation of moisture trap 4 again, the separated discharging of the droplet of condensation in the gas, the cold dry gas that does not coagulate is through the pressurization of circulating fan 5; Get into heat exchanger 8 through valve 7A again, with the damp-heat heat exchange that tower 2B cat head comes out, this is equivalent to before electrical heating, carry out a preheating; And then get into 6 heating of electric pressurizer, and being heated to the desorption temperature of molecular sieve after valve 4B gets into the tower from the tower still of tower 2B, heat is passed the molecular sieve in the tower in gas; With water evaporation in the molecular sieve, discharge damp-heat from cat head, form circulation.When the water in the molecular sieve is separated the value that is drawn onto technological requirement, through the switching of valve, make tower 2B transfer absorption to, tower 2A transfers regeneration to, and so circulation is carried out dehydration process continuously.
If the treating capacity of gas is bigger, can extend to multi-tower structures such as four towers, six towers, eight towers with reference to Double-Tower Structure, promptly the tower of partial amt is made as absorption, and the tower of partial amt is made as regeneration.If adsorption time is long, the recovery time is short, be made as regeneration to tower of major general, and all the other all is made as absorption, and regenerative process is carried out between multitower successively by turns, can realize the function of above-mentioned continuous dehydration equally.
The mist that the present invention handles comprises natural gas, coal bed gas, oil field gas, oven gas, coal gas, CO gas during carbon back is synthetic, H in the petrochemical industry
2Gas, food-class CO
2Deng.Wherein coal gas is if middle calorific value town gas then wherein contains methyl alcohol, because usually need in gas-making process, go here and there the synthesizing methanol operation for the calorific value of calorific value town gas in improving, therefore, coal gas will be with water in the gas, methanol stripper before being sent to the user.When centering calorific value of gas of the present invention dewaters, also can be with methanol stripper.
Claims (2)
1. the energy-saving gas dewatering device of a pressure-reduction zero-emission; It is made up of two or more drying/adsorption towers (2A, 2B), air cooler (3), moisture trap (4), circulating fan (5), electric heater (6), gas/gas heat exchanger (8) at least; The cat head fairlead of said each drying/adsorption tower is divided into two-way; The valve (1A or 1B) of leading up to is incorporated charging tracheae (9) into; Another road is also incorporated the total fairlead of cat head (10) into through a valve (2A or 2B), and the total fairlead of described cat head (10) joins with the hot gas air inlet pipe of gas/gas heat exchanger (8), and the air inlet pipe of the hot gas escape pipe of gas/gas heat exchanger and air cooler (3) is joined; The air inlet pipe of the escape pipe of said air cooler and moisture trap (4) is joined, and the air inlet pipe of the escape pipe of said moisture trap (4) and circulating fan (5) is joined; The tower still fairlead of said each drying/adsorption tower also is divided into two-way; The valve (3A or 3B) of leading up to is incorporated discharging tracheae (11) into; Another road is also incorporated the escape pipe of electric heater (6) into through a valve (4A or 4B); The cold air escape pipe of the air inlet pipe of electric heater (6) and gas/gas heat exchanger joins; It is characterized in that: the escape pipe of said circulating fan (5) is divided into two-way, and the valve (7A) of leading up to joins with the cold air air inlet pipe of gas/gas heat exchanger (8), and another road is also incorporated charging tracheae (9) into through a valve (7B).
2. the energy-saving gas dewatering device of pressure-reduction zero-emission according to claim 1 is characterized in that: frequency converter (12) is housed on the described circulating fan (5).
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| CN103272460A (en) * | 2013-05-29 | 2013-09-04 | 山东道先为能源科技有限公司 | Waste heat regeneration absorption dryer |
| CN105713688A (en) * | 2014-12-19 | 2016-06-29 | 重庆恬愉石油技术有限公司 | Shale gas based double-tower cyclic dehydration system |
| CN106281520A (en) * | 2015-05-15 | 2017-01-04 | 肇庆新奥燃气有限公司 | A kind of double-tower molecular sieve Gas Dehydration System |
| CN105032118A (en) * | 2015-07-13 | 2015-11-11 | 苏州赛弗尔机械有限公司 | Variable-air-volume regenerated gas recycling dryer |
| CN105032130A (en) * | 2015-07-14 | 2015-11-11 | 苏州赛弗尔机械有限公司 | Dynamical type variable air volume regenerated gas recovery and adsorption drier |
| CN105148687A (en) * | 2015-07-15 | 2015-12-16 | 苏州赛弗尔机械有限公司 | Regenerated gas recovery and adsorption drying machine |
| CN104998514A (en) * | 2015-07-15 | 2015-10-28 | 苏州赛弗尔机械有限公司 | Bypass variable-air-volume regenerated air recovery dryer |
| CN105854502B (en) * | 2016-03-31 | 2018-06-29 | 天津渤化永利化工股份有限公司 | A kind of regenerating molecular sieve gas heats waterproof method |
| CN108822909A (en) * | 2018-07-06 | 2018-11-16 | 东华工程科技股份有限公司上海分公司 | Gas Dehydration System with regenerating molecular sieve gas UTILIZATION OF VESIDUAL HEAT IN |
| CN111701408A (en) * | 2020-07-27 | 2020-09-25 | 重庆鲍斯净化设备科技有限公司 | High-efficiency adsorption type compressed air drying system |
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