CN103173256B - Natural gas multi-tower external cycle anaerobic regeneration dewatering method - Google Patents
Natural gas multi-tower external cycle anaerobic regeneration dewatering method Download PDFInfo
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- CN103173256B CN103173256B CN201310134630.3A CN201310134630A CN103173256B CN 103173256 B CN103173256 B CN 103173256B CN 201310134630 A CN201310134630 A CN 201310134630A CN 103173256 B CN103173256 B CN 103173256B
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Abstract
The invention relates to a natural gas multi-tower external cycle anaerobic regeneration dewatering method, and particularly relates to a natural gas dewatering device and a technique of an LNG (liquefied natural gas) preparation station for large-scale concentrated treatment of natural gas pipeline transportation. The dewatering method is characterized by comprising the steps of absorbing moisture in gas in saturated gas by an adsorbent under a normal-temperature condition through an adsorption tower; carrying out anaerobic regeneration on the adsorbent in the adsorption tower by external regenerated gas, utilizing in a recycling manner, and desorbing impurity components such as water and heavy hydrocarbon adsorbed on the adsorbent, so as to carry out the next adsorption process by the adsorption tower, wherein each adsorption tower passes through the processes of adsorption, decompression, purging, heating, cooling and boosting. The technique has the characteristics of simple flow, high dewatering efficiency, low energy consumption and the like; the service life of the adsorbent is prolonged; and the operating cost is reduced.
Description
Technical field
The invention belongs to natural gas conditioning field, particularly the technical field of Oilfield Natural Gas Plant dehydration.
Background technology
The Sweet natural gas that well head flows out is nearly all gas phase saturation water, even can carry a certain amount of liquid water.In Sweet natural gas, the existence of moisture tends to cause serious consequence: contain CO
2and H2
ssweet natural gas in the situation that having water to exist, form acid and corrosion pipeline and equipment; Form gas hydrate under certain condition and stop up valve, pipeline and equipment; Reduce pipeline transmission capacity, cause unnecessary power consumption.Moisture is very disadvantageous thing in the existence of Sweet natural gas, therefore, needs the requirement of dehydration more strict.
The method of gas dehydration generally comprises low temperature process, solvent absorption, solid absorption method, chemical reaction method and membrane separation process etc.Low temperature process dehydration utilizes high-pressure natural gas throttling expansion cooling or utilizes gas wave machine expansion lower the temperature and realize, and this technique is suitable for high-pressure natural gas; And for low pressure natural gas, must supercharging if will use, thus the economy of process affected.Solvent absorption and solid absorption method are applied more extensive at present in gas industry.Solvent absorption dehydration is one of the most general method of applying in current gas industry.It utilizes principle of absorption, adopts a kind of hydrophilic solvent fully to contact with Sweet natural gas, thereby makes water be delivered to the object that reaches dehydration in solvent.In the time that liquid contacts with the solid surface of porous, due to the interaction between fluid molecule and solid surface molecule, fluid molecule can be attracted on solid surface, causes fluid molecule content on solid surface to increase, and this phenomenon is called the adsorption phenomena of solid surface.Solid absorption method is exactly to utilize the solid, porous particles material that optionally fluid-absorbent Semi-polarity is strong to be attached on its surfaces externally and internally, thus the method that fluid mixture is separated.The solid material with certain adsorptive power is called sorbent material, and the material being adsorbed is called adsorbate.The conventional sorbent material of absorption method has molecular sieve, silica gel and activated alumina at present.
CN102703151A, CN101508928B, CN201692757U, in these patents such as CN2456821Y, all adopt the part Sweet natural gas after the part Sweet natural gas before dehydration or dehydration has been carried out to thermal regeneration as resurgent gases, conventional dehydrated adsorbent has molecular sieve at present, silica gel and activated alumina, during except silica regeneration, temperature is lower, only have outside 180-230 ℃, the regeneration temperature of molecular sieve and activated alumina is all higher, be generally 220-310 ℃, owing to containing a large amount of hydrogen sulfide and micro-oxygen in the Sweet natural gas before not dewatering, in thermal regeneration process, hydrogen sulfide and micro-oxygen are at the mesopore inside diameter surface generation claus reaction of sorbent material, reaction equation following (1):
3H
2S+3/2O
2=3/xS
x+3H
2O+615KJ/mol
Due to the S of claus reaction generation
xbe attached to before this bore surface of sorbent material, then be the outside surface that is attached to sorbent material, along with time lengthening, the dewatering efficiency that causes sorbent material declined and must change sorbent material, dewatering system resistance drop increases and impacts to follow-up workshop section, has increased Financial cost.
Summary of the invention
The object of this invention is to provide a kind of simple flow, reduce investment outlay, the Sweet natural gas multitower outer circulation anaerobic regeneration dewatering of occupation of land and working cost, prevent that the claus reaction in adsorption tower from generating, effectively extended the work-ing life of sorbent material.
The object of the present invention is achieved like this, Sweet natural gas multitower outer circulation anaerobic regeneration dewatering, and the method comprises the steps:
1) absorption: saturated gas is utilized to the moisture of tower internal adsorption agent in absorbed natural gas by adsorption tower under normal temperature condition, and its adsorption time is 7-8 hour;
2) step-down: complete after adsorption process, adsorption tower carries out reverse pressure of releasing in tower to 0-0.6MPa by pipeline and valve;
3) purge: after step-down process completes, adopt resurgent gases to purge adsorption tower, purge time 3-10 minute;
4) heating: resurgent gases is heated to 260-310 ℃ of scope, enter adsorption tower from adsorption tower bottom, to be adsorbed on moisture thermal regeneration on sorbent material out, its heating regeneration gas is through being cooled to 30-40 ℃, separate and return to supercharger after its liquid water and heavy hydrocarbon and recycle, be 4-4.5 hour heat-up time;
5) cooling: after thermal regeneration completes, pass into normal temperature resurgent gases to adsorption tower, by normal temperature resurgent gases, the heat in adsorption tower is shifted out, make the temperature of adsorption tower drop to 30-50 ℃, be 3-3.5 hour cooling time;
6) boost: by cooling rear adsorption tower port closing, introducing portion unstripped gas enters into this tower, and the press process that makes its pressure reach raw natural gas is the process of boosting.
Described adsorption tower number is 2-10.
Described resurgent gases is nitrogen or the methane of oxygen-free component.
Described recycling is that resurgent gases is pressurized to 0.1-0.6MPa by supercharger, then through heating/enter adsorption tower after cooling, adsorption tower out after again after cooling, gas-liquid separation, resurgent gases is returned to the import of supercharger, so form circulation loop, make resurgent gases recycle.In purge, there is a small amount of resurgent gases loss, on supercharger ingress or gas-liquid separation equipment, increase resurgent gases and fill into the resurgent gases of pipeline with replenish loss.
In sum, advantage of the present invention is:
1) adopt anaerobic resurgent gases to regenerate to sorbent material, effectively prevent that claus reaction from occurring, and improves dewatering efficiency;
2) increase work-ing life of sorbent material, saved running cost; Simultaneously, owing to adopting anaerobic resurgent gases, sorbent material is regenerated, effectively prevent that claus reaction from occurring, avoid being attached to due to the Sx that claus reaction generates the bore surface of sorbent material, then be the outside surface that is attached to sorbent material, cause the dewatering efficiency of sorbent material to decline and the necessary defect of changing sorbent material.Within in current dehydration project both domestic and external general 2 years to 3 years, will change sorbent material, and in the application, can extend sorbent material work-ing life to 5 to 6 years.
3) resurgent gases after supercharging is directly connected in series with interchanger, and resurgent gases recycles, and has reduced energy consumption;
4) there is security of system, surely write, simple to operate, the feature that level of automation is high.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the present embodiment.
Embodiment
Referring to Fig. 1, for convenience of narration, as an example of tetra-adsorption towers of T101A ~ D example, the present invention is described below.Wherein, two towers of adsorption tower T101A and adsorption tower T101B are in adsorption process, and adsorption tower T101C is in heat-processed, and adsorption tower T101D is in process of cooling.
Adsorption process
What the present embodiment adopted is double tower absorption in parallel, and in office when marquis has two towers in adsorption step, and the feed time of two towers differs adsorption cycle half.
Raw natural gas (containing saturation water) enters from the top of adsorption tower T101A and T101B through valve K1a and K1b under normal temperature condition, out send out-of-bounds through valve K2a and K2b from the bottom of adsorption tower T101A and T101B, water, heavy hydrocarbon in this process Raw gas (are mainly C
4+-hydrocarbon is adsorbed agent absorption, and the methane not being adsorbed, nitrogen, ethane, propane etc. are sent out-of-bounds through valve K2a and K2b, and its adsorption time is 7-8 hour;
Step-down process
Complete the adsorption tower T101B of adsorption process, through valve K6b against absorption direction by the pressure decreased of adsorption tower T101B to 0-0.6MPa, now have a small amount of moisture and heavy hydrocarbon along with the Sweet natural gas of step-down is discharged, this part low pressure natural gas is discharged battery limit (BL) and can directly be used as fuel;
Purge
Adsorption tower T101B is after step-down process completes, entering a small amount of resurgent gases by valve K3b in the bottom of adsorption tower T101B purges it, hydrogen a small amount of in raw natural gas between absorbent particles is displaced to the nitrogen that resurgent gases is oxygen-free component or methane, purge time 3-10 minute;
Heat-processed
Resurgent gases is heated to 260-310 ℃ by well heater E101, enter from adsorption tower T101B bottom through valve K4b, to be adsorbed on moisture thermal regeneration on sorbent material out, resurgent gases after heating is being carried moisture and a small amount of heavy hydrocarbon and is being entered water cooler E103 through valve K5b and be cooled to 30-40 ℃, then enter gas-liquid separator V101 and recycle except return to supercharger C101 after liquid water and heavy hydrocarbon, be 4-4.5 hour heat-up time;
Process of cooling
After adsorption tower T101B thermal regeneration completes, the resurgent gases that is pressurized to 0.1-0.6MPa through supercharger C101 is entered into water cooler E102 heat exchange to 30 ~ 50 ℃, then enter adsorption tower T101B through valve K4b, heat in tower is shifted out by valve K5b, make the temperature of adsorption tower T101B drop to 30-50 ℃, this process further removes the moisture in tower, and be 3-3.5 hour cooling time;
The process of boosting
Cooled adsorption tower T101B outlet valve is closed, and introducing portion unstripped gas enters into adsorption tower T101B through valve K6b, makes its pressure reach the pressure of raw natural gas.
So far, realized the circulation of adsorption tower T101B from the adsorption process-step-down process-purge-heat-processed-process of cooling-process of boosting.Four adsorption towers all form circulation by step above, have guaranteed the continuously feeding of unstripped gas and the continuous wave output of product.
According to step above, resurgent gases is pressurized to 0.1-0.6MPa by supercharger C101, then after well heater E101/ water cooler E102, each adsorption tower is carried out to purge, heating cycle process, refrigeration cycle process, the resurgent gases of adsorption tower after is out cooled to 30-40 ℃ to enter gas-liquid separator V101 through supercooler E103, resurgent gases after gas-liquid separation is back to the import of supercharger C101 out from gas-liquid separator V101 top, so form circulation loop, make resurgent gases recycle.
In purge, there is a small amount of resurgent gases loss, on supercharger ingress or gas-liquid separation equipment, increase resurgent gases and fill into the resurgent gases of pipeline with replenish loss.
As above institute's art, can implement the present invention preferably.
Claims (3)
1. Sweet natural gas multitower outer circulation anaerobic regeneration dewatering, it is characterized in that comprising and saturated gas is utilized under normal temperature condition to the moisture in sorbent material adsorbed gas by adsorption tower, then adopt extraneous resurgent gases to carry out anaerobic regeneration to the sorbent material in adsorption tower, and recycle, make to be adsorbed on the impurity composition such as water, heavy hydrocarbon desorption on sorbent material out, so that adsorption tower carries out adsorption process next time, each adsorption tower will be through absorption, step-down, purging, heating, the cooling and process of boosting, and concrete steps are as follows:
1) absorption: saturated gas is utilized to the moisture of tower internal adsorption agent in absorbed natural gas by adsorption tower under normal temperature condition, and its adsorption time is 7-8 hour;
2) step-down: complete after adsorption process, adsorption tower carries out reverse pressure of releasing in tower to 0-0.6MPa by pipeline and valve;
3) purge: after step-down process completes, adopt resurgent gases to purge adsorption tower, purge time 3-10 minute;
4) heating: resurgent gases is heated to 260-310 ℃ of scope, enter adsorption tower from adsorption tower bottom, to be adsorbed on moisture thermal regeneration on sorbent material out, its heating regeneration gas is through being cooled to 30-40 ℃, separate and return to supercharger after its liquid water and heavy hydrocarbon and recycle, be 4-4.5 hour heat-up time;
5) cooling: after thermal regeneration completes, pass into normal temperature resurgent gases to adsorption tower, by normal temperature resurgent gases, the heat in adsorption tower is shifted out, make the temperature of adsorption tower drop to 30-50 ℃, be 3-3.5 hour cooling time;
6) boost: by cooling rear adsorption tower port closing, introducing portion unstripped gas enters into this tower, and the press process that makes its pressure reach raw natural gas is the process of boosting;
Described anaerobic be regenerated as utilize the extraneous nitrogen that oxygen-free gas composition is provided or methane to adsorption tower purge, heating, process of cooling.
2. Sweet natural gas multitower outer circulation anaerobic regeneration dewatering as claimed in claim 1, is characterized in that described adsorption tower number is 2-10.
3. Sweet natural gas multitower outer circulation anaerobic as claimed in claim 1 regeneration dewatering, is characterized in that described recycling is that the gas after regeneration is so formed to closed-circuit system and recycled by pressurization, heating/cooling, regeneration, cooling, gas-liquid separation, pressurization.
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| CN108048146A (en) * | 2017-11-09 | 2018-05-18 | 无锡联合超滤净化设备科技有限公司 | The regenerated high-pressure natural gas drying process of alternating temperature transformation closed cycle |
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| CN109603421A (en) * | 2018-11-06 | 2019-04-12 | 杨皓 | A kind of activation method of dechlorination pressure-variable adsorption carbon molecular sieve |
| CN109603420A (en) * | 2018-11-06 | 2019-04-12 | 杨皓 | A kind of activation method of decarburization pressure-swing absorber silica gel |
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