CN104673417B - The system and method for precooling and dry decontamination for natural gas from coal - Google Patents
The system and method for precooling and dry decontamination for natural gas from coal Download PDFInfo
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- CN104673417B CN104673417B CN201510083813.6A CN201510083813A CN104673417B CN 104673417 B CN104673417 B CN 104673417B CN 201510083813 A CN201510083813 A CN 201510083813A CN 104673417 B CN104673417 B CN 104673417B
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Abstract
The system and method that the present invention proposes the precooling for natural gas from coal and dry decontamination, wherein, the system of precooling and dry decontamination for natural gas from coal includes：Precooler, gas-liquid separator, cooler and scrubbing tower, the separator inlet of gas-liquid separator are connected with the first cooled natural gas outlet of precooler；First cooled natural gas entrance of cooler is connected with the separator outlet of gas-liquid separator；Second cooled natural gas entrance of scrubbing tower is connected with the second cooled natural gas outlet of cooler；Wherein, the methanol cleaning mixture entrance of scrubbing tower is connected with the low temperature washing device for methanol in the system of decontaminating syngas, liquid outlet after the methanol washing of scrubbing tower is connected with the low-temp methanol absorption tower in the system of decontaminating syngas, and the system to utilize the low-temp methanol of low temperature washing device for methanol production to return decontaminating syngas after being dried purified treatment to the second cooled natural gas in scrubbing tower in advance is used for decontaminating syngas.
Description
Technical field
The invention belongs to natural gas from coal dry decontamination process field, specifically, the present invention relates to coal system natural
The precooling of gas and the system and method for dry decontamination.
Background technology
The main component of natural gas from coal is methane, therefore also referred to as methane gas.Methanation (the first of natural gas from coal device
Alkane synthesize) product be 40 DEG C or so the natural gas from coal (methane gas) containing saturation water, enter pipe natural gas long-distance transport pipes or
Methane gas liquefaction must carry out dehydrate purified treatment before producing LNG.Common method has cold partition method, solid absorption method and molten
Agent absorption process.
Cold partition method is to cause temperature change using pressure change, makes the method that water vapour is condensed out from gas phase.Often
With there is two kinds of flow processs：Cooling process after throttling expansion cooling process and pressurization, the aridity of above two method gas is dew point
Temperature, affected by many factors and energy loss is big, do not reach very low dew point temperature.
Solid absorption method dewatering process is with porous solid absorbent processing gas mixture so as in contained one
Plant or several components are adsorbed on the surface of solids to reach detached operation.Adsorption has two kinds of situations：One is that solid is gentle
Interaction between body is not very strong, similar to condensing, causes the power involved by this absorption with the model for causing condensing effect
Moral China molecule cohesiveness is identical, referred to as physical absorption；Another kind is chemisorbed, and this class tells attached to need activation energy.Physics
Absorption is a reversible process, and chemisorbed is irreversible, is told attached gas and generally requires at very high temperatures could
Evict from, and the gas for being disengaged often has occurred chemical change.
Mostly fixed bed physical absorption currently used for gas dehydration.The impurity that admixture of gas is removed with adsorbent,
Typically recycle all adsorbent reactivation.Intensification desorption is industrial conventional renovation process.This is based on all desiccant
Wet volume capacity all rise with temperature and reduce this feature realizing.Generally using a kind of through preheating desorption gas come plus
Hott bed layer, makes the molecule desorption of adsorbed material, then takes them out of adsorber with carrier gas again, thus can reach absorption,
Circular regeneration.Heat needed for adsorbent reactivation brings adsorbent bed into by carrier gas, and the regeneration temperature of general adsorbent is 175～260
℃.
The operating process of solid drier dehydration is periodic, with one or more drying tower adsorption dewaterings.Should adopt
The absorption outlet capacity desiccant stronger than adsorbing hydro carbons or absorbing acid gases ability, will by being drawn through the desiccant of water with hot gas
Moisture is taken out of and is allowed to regenerate.
Conventional solid absorption evaporation has Calcium Chloride Method, silica gel method, activated alumina and activated bauxite method, molecular sieve
Method and compound fixed Desicdant method etc..Compound fixed desiccant is the advantage for combining multiple desiccant.The method is according to not
Same source of the gas, places different dehydrants respectively, selectively to remove the moisture of different component gas.Gas dehydration mistake
Journey using adsorbent generally have molecular sieve and silica gel.
Solid absorption dewatering process is all higher for the investment of big flow gas and operating cost, and this technique is only suitable for rill
The low pressure natural gas of amount are processed.
Content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.For this purpose, the present invention
One purpose is the system and method for proposing precooling and dry decontamination for natural gas from coal.
According to an aspect of the present invention, the present invention proposes a kind of precooling for natural gas from coal and dry decontamination
System, including：
Precooler, the precooler have gas inlet, the outlet of the first cooled natural gas, the first refrigerant inlet and first
Refrigerant exit, the precooler are suitable to carry out the first cooling treatment to natural gas from coal and obtain the first cooled natural gas；
Gas-liquid separator, the gas-liquid separator have separator inlet, separator outlet and a condensate outlet, described point
It is connected with first cooled natural gas outlet from device entrance, the gas-liquid separator is suitable to enter first cooled natural gas
Row gas-liquid separation；
There is the first cooled natural gas entrance, the outlet of the second cooled natural gas, the second coolant to enter for cooler, the cooler
Mouth and the second refrigerant exit, the first cooled natural gas entrance are connected with the separator outlet, and it is right that the cooler is suitable to
The second cooling treatment is carried out through the first cooled natural gas of the gas-liquid separation and obtains the second cooled natural gas；
Scrubbing tower, the scrubbing tower have the second cooled natural gas entrance, methanol cleaning mixture entrance, purify methane outlet and
Liquid outlet after methanol washing, the second cooled natural gas entrance are connected with second cooled natural gas outlet, the washing
Tower is suitable to be dried and purified treatment second cooled natural gas using methanol cleaning mixture, to obtain rich in methane
Liquid and purification methane after methanol washing；
Wherein, the methanol cleaning mixture entrance is connected with the low temperature washing device for methanol in the system of decontaminating syngas, described
After methanol washing, liquid outlet is connected with the low-temp methanol absorption tower in the system of the decontaminating syngas, to utilize the low temperature
The low-temp methanol of washing device for methanol production is dried at purification to second cooled natural gas in the scrubbing tower in advance
The system for returning the decontaminating syngas after reason is used for decontaminating syngas.
Thus, the above embodiment of the present invention for natural gas from coal precooling and dry decontamination system with purify close
System into gas is combined, and the low-temp methanol prepared in the system of decontaminating syngas is dried purification in advance to natural gas from coal
After process, return for purifying, be purified synthesis gas raw gas, be purified synthesis gas.Thus same solvent first is adopted
Alcohol is purified to raw gas and methane gas simultaneously, high with methane gas degree of purification, and in methane gas, methanol entrainment is few, in methanol solution
Entrainment portions methane, after methanol washing, liquid can wash the absorbing liquid of absorption tower tower top directly as low-temp methanol, and then eliminate list
Solely the low-temp methanol and regenerative system for dry decontamination is provided for natural gas from coal scrubbing tower, reach energy-saving purpose；
Or eliminate and be individually for natural gas from coal dry decontamination and be separately provided dry decontamination system, reach reduce investment outlay and drop low consumed
Purpose.
In addition, according to the above embodiment of the present invention may be used also for the precooling of natural gas from coal and the system of dry decontamination
To have the technical characteristic for adding as follows：
In some embodiments of the invention, precooling and the dry decontamination for natural gas from coal of above-described embodiment
System is further included：Methanol force (forcing) pump, liquid outlet after the methanol force (forcing) pump is located at the methanol washing are closed with described purification
Enter the low-temp methanol into liquid pump between the low-temp methanol absorption tower in the system of gas and after being suitable to wash the methanol to absorb
In tower.
In some embodiments of the invention, precooling and the dry decontamination for natural gas from coal of above-described embodiment
System is further included：Degassing tank, the degassing tank are located between the scrubbing tower and the methanol force (forcing) pump, the degassing tank
The methane that is rich in liquid after being suitable to remove the methanol washing is simultaneously back in the scrubbing tower.
In some embodiments of the invention, the low temperature in second refrigerant inlet and the system of the decontaminating syngas
The regenerative system of washing device for methanol is connected, and second refrigerant exit is connected with first refrigerant inlet, to utilize
State low temperature exhaust gas and/or low-temperature carbon dioxide that the regenerative system of the low temperature washing device for methanol in the system of decontaminating syngas is discharged
The first cooling treatment and the second cooling treatment is carried out to the natural gas；
Optionally, further include：Methanol solution entrance, the methanol solution entrance arrange the connection gas-liquid separator
On the pipeline of the cooler, before second cooling treatment is carried out, to spray into first in first cooled natural gas
Alcohol liquid.
In some embodiments of the invention, second refrigerant inlet is connected with the purification methane outlet, and described
Second refrigerant exit is connected with first refrigerant inlet, cold to carry out first using the purification methane to the natural gas
But process and the second cooling treatment.
In some embodiments of the invention, the temperature of the use methanol cleaning mixture is -40～-70 degrees Celsius, described the
The temperature of one cooled natural gas is 3-8 degree Celsius, and the temperature of second cooled natural gas is -20～-40 degrees Celsius.
According to a further aspect in the invention, the invention allows for a kind of utilization is described previously for natural gas from coal
Precool and dry decontamination system natural gas from coal is precooled and dry decontamination method, the method includes：
The first cooling treatment is carried out to natural gas from coal in precooler, to obtain the first cooled natural gas；
Gas-liquid separation is carried out to first cooled natural gas in gas-liquid separator, to separate water vapor condensate；
In cooler the first cooled natural gas through the gas-liquid separation are carried out with the second cooling treatment and obtains
Two cooled natural gas；
Second cooled natural gas are dried and purified treatment in scrubbing tower, to be purified methane；
Wherein, the methanol cleaning mixture using the low temperature washing device for methanol production in decontaminating syngas system is to described the
Two cooled natural gas are dried and purified treatment, obtain liquid after the methanol washing rich in methane, and after the methanol is washed
Purified treatment is carried out to raw gas in low-temp methanol absorption tower in the system of the liquid return decontaminating syngas, conjunction is purified
Into gas.
In some embodiments of the invention, above-mentioned natural gas from coal is precooled and the method for dry decontamination enters one
Step includes：Liquid pump after methanol washing is entered in the low-temp methanol absorption tower using methanol force (forcing) pump；
Optionally, further include：The methane that is rich in liquid after methanol washing is removed using degassing tank and is back to
In the scrubbing tower.
In some embodiments of the invention, using the low temperature washing device for methanol in the system of the decontaminating syngas again
The low temperature exhaust gas and/or low-temperature carbon dioxide that raw system is discharged are carried out to the natural gas at the first cooling treatment and the second cooling
Reason；
Optionally, further include：Before second cooling treatment is carried out, spray into in first cooled natural gas
Methanol solution.
In some embodiments of the invention, using described purification methane the natural gas is carried out the first cooling treatment and
Second cooling treatment.
Description of the drawings
Fig. 1 is the knot of the system of the precooling for natural gas from coal according to an embodiment of the invention and dry decontamination
Structure schematic diagram.
Fig. 2 is the system of the precooling for natural gas from coal in accordance with another embodiment of the present invention and dry decontamination
Structural representation.
Specific embodiment
According to an aspect of the present invention, the present invention proposes a kind of precooling for natural gas from coal and dry decontamination
System.The precooling and drying for natural gas from coal that the specific embodiment of the invention is described in detail below with reference to Fig. 1-2 is net
The system of change, the system include：Precooler 10, gas-liquid separator 20, cooler 30 and scrubbing tower 40.
Wherein, there are gas inlet 11, the first cooled natural gas to export the 12, first refrigerant inlet 13 and for precooler 10
One refrigerant exit 14.According to a particular embodiment of the invention, precooler 10 is suitable to carry out the first cooling treatment to natural gas from coal
And obtain the first cooled natural gas.
Gas-liquid separator 20 has separator inlet 21, separator outlet 22 and condensate outlet 23, separator inlet 21
It is connected with the first cooled natural gas outlet 12.According to a particular embodiment of the invention, gas-liquid separator 20 is suitable to cool down to first
Natural gas carries out gas-liquid separation.
There are cooler 30 first cooled natural gas entrance 31, the second cooled natural gas to export the 32, second refrigerant inlet 33
With the second refrigerant exit 34, the first cooled natural gas entrance 31 is connected with separator outlet 22.According to being embodied as the present invention
Example, cooler 30 are suitable to carry out the second cooling treatment to the first cooled natural gas through gas-liquid separation and obtain the second cooling day
Right gas.
Scrubbing tower 40 has the second cooled natural gas entrance 41, methanol cleaning mixture entrance 42, purifies methane outlet 43 and first
Liquid outlet 44 after alcohol washing, the second cooled natural gas entrance 41 are connected with the second cooled natural gas outlet 32.According to the present invention's
Specific embodiment, scrubbing tower 40 are suitable to be dried the second cooled natural gas and purified treatment using methanol cleaning mixture, so as to
Obtain liquid and purification methane after the methanol washing rich in methane.
According to a particular embodiment of the invention, the low-temp methanol in the system of methanol cleaning mixture entrance 42 and decontaminating syngas
Cleaning device regenerative system is connected (see photo), and liquid outlet after methanol washing is absorbed with the low-temp methanol in the system of decontaminating syngas
Tower is connected, so that the low-temp methanol using the production of low temperature washing device for methanol regenerative system is in advance in scrubbing tower to the second cooling day
So gas returns the system of decontaminating syngas for decontaminating syngas after being dried purified treatment.
Thus, the above embodiment of the present invention for natural gas from coal precooling and dry decontamination system with purify close
System into gas is combined, and the low-temp methanol prepared in the system of decontaminating syngas is dried purification in advance to natural gas from coal
After process, return for purifying raw gas, be purified synthesis gas.Thus using same solvent methanol simultaneously to raw gas and
Methane gas are purified, high with methane gas degree of purification, and in methane gas, methanol entrainment is few, entrainment portions methane in methanol solution, first
After alcohol washing, liquid can wash the absorbing liquid of absorption tower tower top directly as low-temp methanol, and then eliminate and be individually for natural gas from coal and wash
Wash tower and low-temp methanol and regenerative system for dry decontamination are provided, reach energy-saving purpose；Or eliminate and be individually for coal
Preparing natural gas dry decontamination is separately provided dry decontamination system, reaches and reduces investment outlay and drop low consumed purpose.
In addition, the present invention's is tied with low temperature washing device for methanol for the precooling of natural gas from coal and the system of dry decontamination
Close, whole low-temp methanol lean solutions that low-temp methanol is washed after hot recycling participate in the washing dry decontamination of natural gas from coal, methane air purge
Wash tower bottom of towe methanol solution all can return to elevated pressures low-temp methanol wash absorption tower tower top as absorb cleaning mixture.All
Low-temp methanol lean solution participates in methane gas washing, and one is the temperature for reducing as far as possible purifying methane gas, and the dry decontamination of methane gas is more
Thoroughly, in purification methane gas, methanol content is lower, and methanol loss is minimum；Two is that whole methanol lean solutions are saturated methane gas, methane
In methanol solution, carrying amount is maximum, discharges entrance decontaminating syngas, dilute purification in the absorption tower that low-temp methanol is washed
The concentration of hydrogen and carbon monoxide in synthesis gas, the heat release for advantageously reducing the methane synthetic reaction of follow-up natural gas from coal are strong
Degree, reduces the circulating flow rate of methanator, so as to reduce the energy consumption of recycle compressor；Three is the temperature for purifying methane gas
Low, advantageously reduce the freezing energy consumption of methane gas liquefaction preparing liquefied natural gas LNG devices.
According to a particular embodiment of the invention, precooling and the dry decontamination for natural gas from coal of above-described embodiment
System, can further include：Methanol force (forcing) pump 50, liquid outlet 44 after methanol force (forcing) pump 50 is located at methanol washing are closed with purifying
Into between the low-temp methanol absorption tower in the system of gas.According to the specific example of the present invention, can be with using the methanol force (forcing) pump 50
After methanol is washed liquid pump enter elevated pressures low-temp methanol wash absorption tower tower top as absorb cleaning mixture to purifying, obtain
Decontaminating syngas.
According to a particular embodiment of the invention, precooling and the dry decontamination for natural gas from coal of above-described embodiment
System, can further include：Degassing tank 60, degassing tank 60 are located between scrubbing tower 40 and methanol force (forcing) pump 60.Thus, profit
It is suitable to remove with the degassing tank methane that is rich in liquid after the methanol is washed and is back in the scrubbing tower.
According to a particular embodiment of the invention, precooling and the dry decontamination for natural gas from coal of above-described embodiment
In system, the second refrigerant inlet 33 is connected with the regenerative system of the low temperature washing device for methanol in the system of the decontaminating syngas,
And second refrigerant exit 34 be connected with the first refrigerant inlet 13.Thus, it is possible to low in utilizing the system of the decontaminating syngas
The low temperature exhaust gas and/or low-temperature carbon dioxide that the regenerative system of warm washing device for methanol is discharged carry out the first cooling treatment to natural gas
With the second cooling treatment, cold logistics cold is reclaimed, reduce cryogen consumption, and then reducing energy consumption.
According to a particular embodiment of the invention, further include：Methanol solution entrance 24, the methanol solution entrance 24 set
Put on the pipeline of connection gas-liquid separator 20 and cooler 30, with before second cooling treatment is carried out, to the first cooling day
So methanol solution is sprayed in gas.It is possible thereby to be prevented effectively from the second cooled natural gas obtained after the first cooling treatment carry out
During the second cooling, the water vapor condensate icing for wherein containing causes system jams.
According to a particular embodiment of the invention, the temperature of the first cooled natural gas is obtained after above-mentioned first cooling treatment
For 3-8 degree Celsius, the temperature for obtaining the second cooled natural gas after above-mentioned second cooling treatment is -20～-40 degrees Celsius.By
This by the low temperature exhaust gas of the regenerative system using low temperature washing device for methanol in the system of the decontaminating syngas and/or
Low-temperature carbon dioxide effectively can be precooled to natural gas as coolant.
According to a particular embodiment of the invention, the low-temp methanol for preparing in the system of auto purification in future synthesis gas is used as methanol
The temperature of cleaning mixture be 40～70 degrees Celsius, it is possible thereby to effectively to the temperature after precooling is processed be 20～40
Degree Celsius natural gas is dried purified treatment.According to a particular embodiment of the invention, whole low-temp methanol lean solutions participate in methane
Gas washing, one is the temperature for reducing as far as possible purifying methane gas, and the dry decontamination of methane gas is more thorough, purifies methanol in methane gas
Content is lower, and methanol loss is minimum；Two is that whole methanol lean solutions are saturated methane gas, and methane carrying amount in methanol solution is maximum,
Entrance decontaminating syngas are discharged in the absorption tower that low-temp methanol is washed, and dilute hydrogen and carbon monoxide in decontaminating syngas
Concentration, advantageously reduce the heating strength of the methane synthetic reaction of follow-up natural gas from coal, reduce following for methanator
Ring tolerance, so that reduce the energy consumption of recycle compressor；Three be purify methane gas temperature low, advantageously reduce methane gas liquefaction system
The freezing energy consumption of liquefied natural gas LNG devices.
According to a particular embodiment of the invention, for natural gas from coal cooler in precooling and the system of dry decontamination
The second refrigerant inlet 33 in 30 is connected with methane outlet 43 is purified, and the second refrigerant exit 34 and first refrigerant inlet 13
It is connected.It is possible thereby to the cold for purifying methane described in effectively utilizes carries out the first cooling treatment and the second cooling to the natural gas
Process, save and reduce cryogen consumption, while re-heat can also be carried out to purifying methane, be easy to the pipeline for obtaining room temperature natural
Gas.
According to a particular embodiment of the invention, for natural gas from coal have in precooling and the system of dry decontamination pre-
Cooler and cooler, can carry out segmentation precooling to natural gas from coal.First paragraph (precooling zone) is cooled to a 3-8 degree Celsius of left side
The right side, the condensed fluid of condensation separation most of water vapor therein；Second segment (cooling section) continues cooling after antifreeze methanol is sprayed into
Enter methane gas wash tower to -20 DEG C～-40 DEG C or so.The present invention is greatly reduced water and enters methanol solution, the water allowed in methanol solution
Divide content minimum, and isolate the water-cooled lime set without methanol.
According to the second aspect of the invention, the present invention also proposes a kind of utilization and is described previously for the pre- of natural gas from coal
Cooling and dry decontamination system natural gas from coal is precooled and dry decontamination method.Concrete reality according to the present invention
Example is applied, the method includes：The first cooling treatment is carried out to natural gas from coal in precooler, natural to obtain the first cooling
Gas；Gas-liquid separation is carried out to first cooled natural gas in gas-liquid separator, to separate water vapor condensate；In cooling
The second cooling treatment is carried out to the first cooled natural gas through the gas-liquid separation in device and obtains the second cooled natural gas；?
Second cooled natural gas are dried and purified treatment in scrubbing tower, to be purified methane；Wherein, using from
The methanol cleaning mixture of the low temperature washing device for methanol production in decontaminating syngas system is dried to second cooled natural gas
And purified treatment, liquid after the methanol washing rich in methane is obtained, and liquid returns the decontaminating syngas after the methanol is washed
System in low-temp methanol absorption tower in purified treatment is carried out to raw gas, be purified synthesis gas.
Thus, the method for the natural gas from coal of the precooling of the above embodiment of the present invention and dry decontamination and decontaminating syngas
Technique combine, by the technique of decontaminating syngas prepare low-temp methanol purified treatment is dried to natural gas from coal in advance
Afterwards, return for purifying raw gas, be purified synthesis gas.Thus using same solvent methanol simultaneously to raw gas and methane
Gas is purified, high with methane gas degree of purification, and in methane gas, methanol entrainment is few, and entrainment portions methane in methanol solution, methanol are washed
The absorbing liquid that rear liquid can wash absorption tower tower top directly as low-temp methanol is washed, and then is eliminated and is individually for natural gas from coal scrubbing tower
Low-temp methanol and regenerative system for dry decontamination is provided, reaches energy-saving purpose；Or eliminate and be individually for coal day
So gas dry decontamination is separately provided dry decontamination system, reaches and reduces investment outlay and drop low consumed purpose.
According to a particular embodiment of the invention, said method is further included：The methanol is washed using methanol force (forcing) pump
Wash rear liquid pump to enter in the low-temp methanol absorption tower.It is possible thereby to liquid pump enters the low-temp methanol of elevated pressures and washes after methanol is washed
Absorption tower tower top is purified to raw gas as cleaning mixture is absorbed, and is purified synthesis gas.
According to a particular embodiment of the invention, said method is further included：The methanol washing is removed using degassing tank
The methane that is rich in liquid afterwards is simultaneously back in the scrubbing tower.Thus, it is possible to the portion being rich in liquid after effective methanol removal washing
Divide methane and return it in scrubbing tower.
According to a particular embodiment of the invention, it is possible to use the low temperature washing device for methanol in the system of the decontaminating syngas
The low temperature exhaust gas discharged of regenerative system and/or low-temperature carbon dioxide carry out the first cooling treatment and second cold to the natural gas
But process.Thus, it is possible to reclaim cold logistics cold, cryogen consumption, and then reducing energy consumption is reduced.
According to a particular embodiment of the invention, before above-mentioned second cooling treatment is carried out, further include to the first cooling
Methanol solution is sprayed in natural gas.It is possible thereby to be prevented effectively from the second cooled natural gas obtained after the first cooling treatment enter
When row second is lowered the temperature, the water vapor condensate icing for wherein containing causes system jams.
According to a particular embodiment of the invention, using described purification methane the natural gas is carried out the first cooling treatment and
Second cooling treatment.It is possible thereby to described in effectively utilizes purify methane cold the natural gas is carried out the first cooling treatment and
Second cooling treatment, saves and reduces cryogen consumption, while re-heat can also be carried out to purifying methane, is easy to the pipe for obtaining room temperature
Road natural gas.
Embodiment
From about 35～45 DEG C of room temperature methane gas (natural gas from coal) temperature of natural gas from coal device methane synthesis, its
In the water vapour containing saturation under pressure and more carbon dioxide.Typical component composition is as follows：
Natural gas from coal group is grouped into：
The natural gas from coal (methane gas) of above-mentioned room temperature initially enters precooler, and cold logistics exchanges heat to a 3-8 degree Celsius of left side
The right side, the water-cooled lime set that separation is wherein condensed；Then spray into methanol before cooler in methane gas to continue and cold logistics heat exchange, drop
Low temperature enters methane gas wash tower bottoms to -20～-40 degrees Celsius.
In methane gas wash tower and low-temp methanol lean solution counter current contacting, low-temp methanol lean solution is from methane gas washing for methane gas
Top of tower is entered.Carbon dioxide, moisture in methane gas is in methane gas wash tower by methanol solution washing absorption, the first being cleaned
Alkane gas is out sent battery limit (BL) from the top of scrubbing tower, about -40～-60 degrees Celsius of temperature, meets natural gas liquefaction ice chest to can
The content requirement of solidifying component；Low temperature purification methane gas can also reclaim cold re-heat, meet pipe natural gas to purified natural gas
Dewpoint requirements.
Containing a small amount of moisture and carbon dioxide in the methanol solution of methane gas wash tower bottoms, degassed groove removing is wherein carried secretly
Gas after, deliver to the low-temp methanol of elevated pressures after the pressurization of low-temp methanol liquid pump and wash at the top of absorption tower as methanol absorption
Liquid, sour gas such as sulfide, carbon dioxide and other harmful poisonous substances and impurity in washing absorption cooled coal gas absorb tower top and obtain
Arrive decontaminating syngas.
After dehydrate process, the pressure of water dew point disclosure satisfy that pipeline is natural to natural gas from coal after above-mentioned process
Gas standard GB17820-2012.In natural gas from coal after above-mentioned process：CO2Carbon dioxide is in below 50ppmv；H2O water vapour
In 1 below ppmv；CH3In below 50ppmv, therefore, carbon dioxide therein and water vapour etc. can coagulate constituent content to OH methanol
Meet liquefaction ice chest acceptable contents level, it is to avoid ice chest is blocked, and reduces deep purifying list in natural gas liquefaction device
The load of unit and energy consumption.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In describing the invention, " multiple " are meant that two or more,
Unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integral；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy described with reference to the embodiment or example
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be arbitrary
Combined in individual or multiple embodiments or example in an appropriate manner.Additionally, in the case of not conflicting, the technology of this area
The feature of the different embodiments or example described in this specification and different embodiments or example can be combined by personnel
And combination.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (9)
1. a kind of precooling and system of dry decontamination for natural gas from coal, it is characterised in that include：
Precooler, the precooler have gas inlet, the outlet of the first cooled natural gas, the first refrigerant inlet and the first coolant
Outlet, the precooler are suitable to carry out the first cooling treatment to natural gas from coal and obtain the first cooled natural gas；
Gas-liquid separator, the gas-liquid separator have separator inlet, separator outlet and condensate outlet, the separator
Entrance is connected with first cooled natural gas outlet, and the gas-liquid separator is suitable to enter circulation of qi promoting to first cooled natural gas
Liquid is separated；
Cooler, the cooler have the first cooled natural gas entrance, the second cooled natural gas outlet, the second refrigerant inlet and
Second refrigerant exit, the first cooled natural gas entrance are connected with the separator outlet, and the cooler is suitable to passing through
First cooled natural gas of the gas-liquid separation carry out the second cooling treatment and obtain the second cooled natural gas；
Scrubbing tower, the scrubbing tower have the second cooled natural gas entrance, methanol cleaning mixture entrance, purify methane outlet and methanol
Liquid outlet after washing, the second cooled natural gas entrance are connected with second cooled natural gas outlet, and the scrubbing tower is fitted
In being dried and purified treatment to second cooled natural gas using methanol cleaning mixture, to obtain the methanol rich in methane
Liquid and purification methane after washing；
Wherein, the methanol cleaning mixture entrance is connected with the low temperature washing device for methanol in the system of decontaminating syngas, the methanol
After washing, liquid outlet is connected with the low-temp methanol absorption tower in the system of the decontaminating syngas, to utilize the low-temp methanol
After the low-temp methanol of cleaning device production is dried purified treatment to second cooled natural gas in advance in the scrubbing tower
The system for returning the decontaminating syngas is used for decontaminating syngas,
The temperature of the methanol cleaning mixture is -40～-70 degrees Celsius, and the temperature of first cooled natural gas is 3-8 degree Celsius,
The temperature of second cooled natural gas is -20～-40 degrees Celsius.
2. precooling and the system of dry decontamination for natural gas from coal according to claim 1, it is characterised in that enter
One step includes：
Methanol force (forcing) pump, the methanol force (forcing) pump are located at after methanol washing in liquid outlet and the system of the decontaminating syngas
Low-temp methanol absorption tower between and be suitable to by the methanol wash after liquid pump enter in the low-temp methanol absorption tower.
3. precooling and the system of dry decontamination for natural gas from coal according to claim 2, it is characterised in that enter
One step includes：
Degassing tank, the degassing tank are located between the scrubbing tower and the methanol force (forcing) pump, and the degassing tank is suitable to remove institute
The methane that is rich in liquid after stating methanol washing is simultaneously back in the scrubbing tower.
4. precooling and the system of dry decontamination for natural gas from coal according to any one of claim 1-3, its are special
Levy and be, the regenerative system outlet of the low temperature washing device for methanol in second refrigerant inlet and the system of the decontaminating syngas
It is connected, and second refrigerant exit is connected with first refrigerant inlet, so that in using the system of the decontaminating syngas
Low temperature washing device for methanol regenerative system discharge low temperature exhaust gas and/or low-temperature carbon dioxide first is carried out to the natural gas
Cooling treatment and the second cooling treatment；
Optionally, further include：Methanol solution entrance, the methanol solution entrance arrange the connection gas-liquid separator and institute
State on the pipeline of cooler, before second cooling treatment is carried out, to spray into methanol in first cooled natural gas
Liquid.
5. precooling and the system of dry decontamination for natural gas from coal according to any one of claim 1-3, its are special
Levy and be, second refrigerant inlet is connected with the purification methane outlet, and second refrigerant exit is cold with described first
Matchmaker's entrance is connected, to carry out the first cooling treatment and the second cooling treatment to the natural gas using the purification methane.
6. a kind of utilize described in any one of 1-5 natural to coal system for the precooling of natural gas from coal and the system of dry decontamination
Gas carries out precooling the method with dry decontamination, it is characterised in that include：
The first cooling treatment is carried out to natural gas from coal in precooler, to obtain the first cooled natural gas；
Gas-liquid separation is carried out to first cooled natural gas in gas-liquid separator, to separate water vapor condensate；
In cooler the first cooled natural gas through the gas-liquid separation are carried out with the second cooling treatment and to obtain second cold
But natural gas；
Second cooled natural gas are dried and purified treatment in scrubbing tower, to be purified methane；
Wherein, the methanol cleaning mixture using the low temperature washing device for methanol production in decontaminating syngas system is cold to described second
But natural gas is dried and purified treatment, obtains liquid after the methanol washing rich in methane, and liquid is returned after the methanol is washed
Purified treatment is carried out to raw gas in the low-temp methanol absorption tower that returns in the system of the decontaminating syngas, synthesis is purified
Gas.
7. method according to claim 6, it is characterised in that further include：Using methanol force (forcing) pump by the methanol
After washing, liquid pump enters in the low-temp methanol absorption tower；
Optionally, further include：The methane that is rich in liquid after methanol washing is removed using degassing tank and is back to described
In scrubbing tower.
8. the method according to claim 6 or 7, it is characterised in that using the low temperature in the system of the decontaminating syngas
The low temperature exhaust gas and/or low-temperature carbon dioxide that the regenerative system of washing device for methanol is discharged are carried out at the first cooling to the natural gas
Reason and the second cooling treatment；
Optionally, before second cooling treatment is carried out, methanol is sprayed in further including to first cooled natural gas
Liquid.
9. method according to claim 6, it is characterised in that first is carried out to the natural gas using the purification methane
Cooling treatment and the second cooling treatment.
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| CN106268164A (en) * | 2016-08-25 | 2017-01-04 | 中国天辰工程有限公司 | A kind of coupling decarbonization process of coal preparing liquefied natural gas |
| CN107365607B (en) * | 2017-08-04 | 2023-04-18 | 上海米素环保科技有限公司 | Compact natural gas pretreatment purification method suitable for offshore platform |
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| FR2942972B1 (en) * | 2009-03-10 | 2012-04-06 | Inst Francais Du Petrole | METHOD FOR DEACIDIFYING GAS BY ABSORBENT SOLUTION WITH VAPORIZATION AND / OR PURIFICATION OF A FRACTION OF THE REGENERATED ABSORBENT SOLUTION |
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| CN102256686A (en) * | 2008-12-17 | 2011-11-23 | 犹德有限公司 | Method for purifying gases and obtaining acid gases |
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