CN105251321A - Dehydration method of coalbed methane and dehydration system - Google Patents
Dehydration method of coalbed methane and dehydration system Download PDFInfo
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- CN105251321A CN105251321A CN201510777626.8A CN201510777626A CN105251321A CN 105251321 A CN105251321 A CN 105251321A CN 201510777626 A CN201510777626 A CN 201510777626A CN 105251321 A CN105251321 A CN 105251321A
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Abstract
The invention relates to a dehydration method of coalbed methane and a dehydration system. The dehydration method comprises the steps that dehydration treatment is conducted on oxygen-containing coalbed methane by means of a first drying tower, and meanwhile displacement, hot blowing, cold blowing and pressure equalizing are sequentially conducted on a second drying tower; dehydration treatment is conducted on the oxygen-containing coalbed methane by means of the second drying tower, and meanwhile displacement, hot blowing, cold blowing and pressure equalizing are sequentially conducted on the first drying tower. The dehydration system comprises the first drying tower, the second drying tower and a regenerating device; the regenerating device is used for conducting displacement, hot blowing, cold blowing and pressure equalizing treatment on the second drying tower or the first drying tower when the first drying tower or the second drying tower conducts dehydration treatment on the oxygen-containing coalbed methane. According to the technical scheme, by means of the dehydration method of the coalbed methane and the dehydration system, dehydration treatment is conducted on the oxygen-containing coalbed methane by means of the first drying tower, and meanwhile displacement, hot blowing, cold blowing and pressure equalizing are sequentially conducted on the second drying tower; the safety of the coalbed methane in the drying process is improved.
Description
Technical field
The present invention relates to coal bed gas process, utilize field, particularly relate to a kind of dewatering and dewatering system of coal bed gas.
Background technology
Coal bed gas is a kind of valuable source can exploiting utilization, the coal bed gas of exploiting out generally all contains more moisture, if do not remove moisture wherein, when coal bed gas enters cryogenic liquefying separator, these moisture can be separated out even icing, thus blocking valve, pipeline, heat exchanger, affect the safe and stable operation of liquefying plant, therefore, before cryogenic liquefying, just must remove the moisture in coal bed gas.
The dewatering of coal bed gas mainly contains absorption method, absorption process and low temperature processing.For needing the coal bed gas entering cryogenic liquefying separator, the general absorption method that adopts carries out deep dehydration.The adsorbent that absorption method is commonly used is molecular sieve, silica gel and aluminium oxide.
The nucleus equipment that the dehydration of coal bed gas absorption method adopts is drying tower, every complete equipment generally has two or more drying tower, after adsorption process, drying tower needs to regenerate, now drying tower can not process coal bed gas, such processing operation must stop, affect production efficiency thus, bring potential safety hazard simultaneously.
The regeneration of drying tower is generally adopt a certain amount of unstripped gas (coalbed methane containing oxygen) or tail gas to carry out hot blow and cold blowing to the tower being in regenerative process.
When containing fuel gas and oxygen in tower, adopt coalbed methane containing oxygen to carry out hot blow and there is the danger of exploding, in normal conditions, the aerial explosion limit of methane is 5 ~ 15%, when temperature and pressure raises, the scope of explosion limit can expand, and therefore coalbed methane containing oxygen itself is not suitable for doing regeneration gas.Because coalbed methane containing oxygen is after cryogenic liquefying is separated, in tail gas, main component is air, and simultaneously containing a certain amount of methane, when working conditions change, the content fluctuation of methane is comparatively large, and likely enter within the scope of explosion limit, therefore tail gas is also not suitable for doing regeneration gas.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of safer, more efficient, can ensure dewatering and the dewatering system of the continual coal bed gas of processing operation.
The dewatering of coal bed gas of the present invention, comprising:
Utilize the first drying tower to coalbed methane containing oxygen processed, meanwhile, the second drying tower replaced successively, hot blow, cold blowing and all press process;
Utilize the second drying tower to coalbed methane containing oxygen processed, meanwhile, the first drying tower replaced successively, hot blow, cold blowing and all press process.
The dewatering of coal bed gas of the present invention, wherein, described second drying tower to be replaced successively, hot blow, cold blowing process and described first drying tower to be replaced successively, hot blow, cold blowing process all utilize nitrogen to carry out.
The dewatering of coal bed gas of the present invention, wherein, described second drying tower to be replaced successively, hot blow, cold blowing and all press process to comprise:
Nitrogen is utilized to carry out replacement Treatment to the coalbed methane containing oxygen in the second drying tower, comprise: the residual gas in described second drying tower is discharged, then nitrogen is passed into described second drying tower, discharge after a period of time, repeat aforesaid operations, until within the content of methane in described second drying tower is reduced to safe range;
Nitrogen is utilized to carry out hot blow process to the second drying tower, comprise: utilize compressor by nitrogen supercharging, nitrogen after supercharging enters the first separator and isolates moisture after the first cooler cooling, then nitrogen is passed into drying aid tower drying and dehydrating, after dry, nitrogen enters heater and is heated to 250 degrees Celsius and enters described second drying tower, hot blow is carried out to described second drying tower, to remove the moisture adsorbed in described second drying tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps, until the delivery temperature of described second drying tower reaches 160 degrees Celsius,
Nitrogen is utilized to carry out cold blowing process to the second drying tower, comprise: utilize described compressor by nitrogen supercharging, moisture is isolated by entering described first separator after described first cooler cooling, then nitrogen is passed into the second drying tower, second drying tower is cooled, afterwards nitrogen is imported described heater, nitrogen after heating is imported drying aid tower, the nitrogen after heating is utilized to carry out hot blow to drying aid tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps,
All process is pressed to the second drying tower, comprising: coalbed methane containing oxygen is passed into the second drying tower, make the pressure in described second drying tower equal with the pressure of the source of the gas of coalbed methane containing oxygen.
The dewatering of coal bed gas of the present invention, wherein, described first drying tower to be replaced successively, hot blow, cold blowing and all press process to comprise:
Nitrogen is utilized to carry out replacement Treatment to the coalbed methane containing oxygen in the first drying tower, comprise: the residual gas in described first drying tower is discharged, then nitrogen is passed into described first drying tower, discharge after a period of time, repeat aforesaid operations, until within the content of methane in described first drying tower is reduced to safe range;
Nitrogen is utilized to carry out hot blow process to the first drying tower, comprise: utilize compressor by nitrogen supercharging, nitrogen after supercharging enters the first separator and isolates moisture after the first cooler cooling, then nitrogen is passed into drying aid tower drying and dehydrating, after dry, nitrogen enters heater and is heated to 250 degrees Celsius and enters described first drying tower, hot blow is carried out to described first drying tower, to remove the moisture adsorbed in described first drying tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps, until the delivery temperature of described first drying tower reaches 160 degrees Celsius,
Nitrogen is utilized to carry out cold blowing process to the first drying tower, comprise: utilize described compressor by nitrogen supercharging, moisture is isolated by entering described first separator after described first cooler cooling, then nitrogen is passed into the first drying tower, first drying tower is cooled, afterwards nitrogen is imported described heater, nitrogen after heating is imported drying aid tower, the nitrogen after heating is utilized to carry out hot blow to drying aid tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps,
All process is pressed to the first drying tower, comprising: coalbed methane containing oxygen is passed into the first drying tower, make the pressure in described first drying tower equal with the pressure of the source of the gas of coalbed methane containing oxygen.
The dewatering system of coal bed gas of the present invention, comprising:
For carrying out the first drying tower, second drying tower of processed to coalbed methane containing oxygen;
Regenerating unit, described regenerating unit is connected respectively with described first drying tower, the second drying tower, described regenerating unit is used for while the first drying tower is to coalbed methane containing oxygen processed, second drying tower is replaced, hot blow, cold blowing and all press process, while the second drying tower is to coalbed methane containing oxygen processed, the first drying tower to be replaced, hot blow, cold blowing and all press process.
The dewatering system of coal bed gas of the present invention, wherein, described regenerating unit comprises:
First pipeline, one end of described first pipeline connects regeneration gas source of the gas, the other end of described first pipeline connects the top import and export of described first drying tower respectively, the top of the second drying tower is imported and exported, when replacement Treatment is carried out to the second drying tower or the first drying tower, described first pipeline is used for regeneration gas being passed into described second drying tower or the first drying tower, within being reduced to safe range to make the methane content in described second drying tower or the first drying tower;
Second pipeline in parallel with described first pipeline, one end of described second pipeline connects regeneration gas source of the gas, the other end of described second pipeline connects the top import and export of described first drying tower respectively, the top of the second drying tower is imported and exported, described second pipeline is disposed with compressor for supercharging regeneration gas by one end of described second pipeline to the other end of described second pipeline, by the first cooler of the regeneration gas cooling after supercharging, cooled regeneration gas is made to isolate the first separator of moisture, make the drying aid tower that the regeneration gas after isolating moisture is dewatered further, to the heater that the regeneration gas after dewatering further heats, second pipeline described in when carrying out hot blow process to the second drying tower or the first drying tower is for will through overcompression, cooling, isolate moisture, drying and dehydrating and be heated to the regeneration gas after 250 degrees Celsius and import described second drying tower or the first drying tower, to remove the moisture adsorbed in the second drying tower or the first drying tower,
3rd pipeline, one end of described 3rd pipeline connects the bottom import and export of described first drying tower respectively, the bottom of described second drying tower is imported and exported, the other end of described 3rd pipeline connects the air inlet of described compressor, described 3rd pipeline is disposed with the second cooler for cooling regeneration gas by one end of described 3rd pipeline to the other end of described 3rd pipeline, cooled regeneration gas is made to isolate the second separator of moisture, described 3rd pipeline is used for described first drying tower, the regeneration gas of discharging during the second drying tower hot blow imports the second cooler cooling, and cooled regeneration gas is imported the second separator isolate aqueous water, afterwards described regeneration gas is imported described compressor boost, to make regeneration gas at described compressor, between described first drying tower circulation or at described compressor, circulate between described second drying tower,
Emptying pipeline, is connected on described 3rd pipeline, for the gas in emptying described first drying tower, the second drying tower.
The dewatering system of coal bed gas of the present invention, wherein, described regenerating unit also comprises:
4th pipeline, one end of described 4th pipeline connects the bottom import and export of described first drying tower respectively, the bottom of described second drying tower is imported and exported, between the first separator that the other end of described 4th pipeline is connected to described second pipeline and drying aid tower, described 4th pipeline be used for by through overcompression, the regeneration gas that cools, isolate moisture imports and exports through the bottom of described first drying tower or the bottom of the second drying tower is imported and exported and imported described first drying tower or the second drying tower, to carry out cold blowing process to described first drying tower or the second drying tower.
The dewatering system of coal bed gas of the present invention, wherein, described regenerating unit also comprises:
5th pipeline, one end of described 5th pipeline is connected on the 3rd pipeline, between the first separator that the other end of the 5th pipeline is connected to described second pipeline and drying aid tower, first drying tower described in cold blowing, the regeneration gas of discharging during the second drying tower enters drying aid tower and carries out hot blow to drying aid tower after described heater heating, 5th pipeline is used for described regeneration gas being imported the second cooler cooling, cooled regeneration gas enters the second separator and isolates aqueous water, regeneration gas enters described compressor boost afterwards, to make described regeneration gas at described compressor, between described first drying tower circulation or at described compressor, circulate between described second drying tower.
The dewatering system of coal bed gas of the present invention, wherein, the top of described first drying tower is imported and exported, the top of the second drying tower is imported and exported respectively by the 6th pipeline, the 7th pipeline connection coalbed methane containing oxygen outlet, by the 8th pipeline connection between described 6th pipeline, described 7th pipeline.
In technical scheme of the present invention, there is no oxygen and fuel gas in drying tower in dry run, therefore substantially increase security.Technical scheme of the present invention, utilizes the first drying tower to while coalbed methane containing oxygen processed, replaces successively the second drying tower, hot blow, cold blowing and all press process, and to ensure that processing operation is uninterrupted, the operating efficiency of drying tower is greatly improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of the dewatering system of coal bed gas of the present invention.
Detailed description of the invention
The dewatering of coal bed gas of the present invention, comprising:
Utilize the first drying tower to coalbed methane containing oxygen processed, meanwhile, the second drying tower replaced successively, hot blow, cold blowing and all press process;
Utilize the second drying tower to coalbed methane containing oxygen processed, meanwhile, the first drying tower replaced successively, hot blow, cold blowing and all press process.
The dewatering of coal bed gas of the present invention, wherein, described second drying tower to be replaced successively, hot blow, cold blowing process and described first drying tower to be replaced successively, hot blow, cold blowing process all utilize nitrogen to carry out.
The dewatering of coal bed gas of the present invention, wherein, described second drying tower to be replaced successively, hot blow, cold blowing and all press process to comprise:
Nitrogen is utilized to carry out replacement Treatment to the coalbed methane containing oxygen in the second drying tower, comprise: the residual gas in described second drying tower is discharged, then nitrogen is passed into described second drying tower, discharge after a period of time, repeat aforesaid operations, until within the content of methane in described second drying tower is reduced to safe range;
Nitrogen is utilized to carry out hot blow process to the second drying tower, comprise: utilize compressor by nitrogen supercharging to 5bar, nitrogen after supercharging enters the first separator and isolates moisture after the first cooler is cooled to 40 degrees Celsius, then nitrogen is passed into drying aid tower drying and dehydrating, after dry, nitrogen enters heater and is heated to 250 degrees Celsius and enters described second drying tower, hot blow is carried out to described second drying tower, to remove the moisture adsorbed in described second drying tower, then nitrogen is imported the second cooler and cool 40 degrees Celsius, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps, until the delivery temperature of described second drying tower reaches 160 degrees Celsius,
Nitrogen is utilized to carry out cold blowing process to the second drying tower, comprise: utilize described compressor by nitrogen supercharging to 5bar, enter described first separator after being cooled to 40 degrees Celsius by described first cooler and isolate moisture, then nitrogen is passed into the second drying tower, 40 degrees Celsius are cooled to the second drying tower, afterwards nitrogen is imported described heater and be heated to 250 degrees Celsius, nitrogen after heating is imported drying aid tower, the nitrogen after heating is utilized to carry out hot blow to drying aid tower, then nitrogen is imported the second cooler and be cooled to 40 degrees Celsius, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps,
All process is pressed to the second drying tower, comprising: coalbed methane containing oxygen is passed into the second drying tower, make the pressure in described second drying tower equal with the pressure of the source of the gas of coalbed methane containing oxygen.
The dewatering of coal bed gas of the present invention, wherein, described first drying tower to be replaced successively, hot blow, cold blowing and all press process to comprise:
Nitrogen is utilized to carry out replacement Treatment to the coalbed methane containing oxygen in the first drying tower, comprise: the residual gas in described first drying tower is discharged, then nitrogen is passed into described first drying tower, discharge after a period of time, repeat aforesaid operations, until within the content of methane in described first drying tower is reduced to safe range;
Nitrogen is utilized to carry out hot blow process to the first drying tower, comprise: utilize compressor by nitrogen supercharging, nitrogen after supercharging enters the first separator and isolates moisture after the first cooler cooling, then nitrogen is passed into drying aid tower drying and dehydrating, after dry, nitrogen enters heater and is heated to 250 degrees Celsius and enters described first drying tower, hot blow is carried out to described first drying tower, to remove the moisture adsorbed in described first drying tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps, until the delivery temperature of described first drying tower reaches 160 degrees Celsius,
Nitrogen is utilized to carry out cold blowing process to the first drying tower, comprise: utilize described compressor by nitrogen supercharging, moisture is isolated by entering described first separator after described first cooler cooling, then nitrogen is passed into the first drying tower, first drying tower is cooled, afterwards nitrogen is imported described heater, nitrogen after heating is imported drying aid tower, the nitrogen after heating is utilized to carry out hot blow to drying aid tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps,
All process is pressed to the first drying tower, comprising: coalbed methane containing oxygen is passed into the first drying tower, make the pressure in described first drying tower equal with the pressure of the source of the gas of coalbed methane containing oxygen.
The dewatering of coal bed gas of the present invention, wherein, adsorption process comprises: the coal bed gas of moisture content is by drying tower under normal temperature condition, and the dried tower of moisture absorbs, and dry coal bed gas is discharged from drying tower, and adsorption cycle is generally 4-12 hour; Replacement process comprises: be switched to reproduced state at drying tower from adsorbed state, and the related valve of drying tower is opened, gas in tower of releasing, and nitrogen enters in tower by valve and pipeline simultaneously, displaces the coalbed methane containing oxygen remained in tower; Hot blow process comprises: regeneration gas is after the dehydration of drying aid tower, enter heater and be heated to 250 degrees centigrade, enter from the top of drying tower, the nitrogen of high temperature enters in drying tower, and the moisture that drying tower adsorbs is carried out desorption, then discharge at the bottom of tower, regeneration gas is after water-cooled is separated, and aqueous water is wherein discharged from knockout drum, and then gas phase enters supercharger supercharging, when drying tower regeneration exhaust temperature reaches 160 degrees centigrade, hot blow process terminates; Cold blowing process comprises: normal-temperature regeneration gas enters drying tower at the bottom of tower, drying tower is lowered the temperature, heater heat temperature raising is entered from tower top gas out, then drying aid tower is entered, hot blow is carried out to drying aid tower, remove the moisture in drying aid tower simultaneously, then carry out water-cooled, separation, again enter supercharger and carry out supercharging; Pressure equalizing comprises: closed by the drying tower terminal valve regenerated, utilize dried coalbed methane containing oxygen slowly to boost to this tower equal with coal bed gas pressure, then close equalizing valve, namely regenerative process completes.
A dewatering also applicable 2-6 drying tower of coal bed gas of the present invention, compiling by 2-6 drying tower is two groups, utilize first group of drying tower to coalbed methane containing oxygen processed, meanwhile, second group of drying tower replaced successively, hot blow, cold blowing and all press process; Utilize second group of drying tower to coalbed methane containing oxygen processed, meanwhile, first group of drying tower replaced successively, hot blow, cold blowing and all press process, circulate with this.
As shown in Figure 1, the dewatering system of coal bed gas of the present invention, comprising:
For carrying out the first drying tower T1, the second drying tower T2 of processed to coalbed methane containing oxygen;
Regenerating unit, regenerating unit and the first drying tower T1, second drying tower T2 connects respectively, regenerating unit is used for while the first drying tower T1 or the second drying tower T2 is to coalbed methane containing oxygen processed, second drying tower T2 or the first drying tower T1 is replaced, hot blow, cold blowing and all press process, namely described regenerating unit is used for while the first drying tower is to coalbed methane containing oxygen processed, second drying tower is replaced, hot blow, cold blowing and all press process, while the second drying tower is to coalbed methane containing oxygen processed, first drying tower is replaced, hot blow, cold blowing and all press process.
The dewatering system of coal bed gas of the present invention, wherein, regenerating unit comprises:
First pipeline 100, one end of first pipeline 100 connects regeneration gas source of the gas, the other end of the first pipeline 100 connects the top import and export of the first drying tower T1 respectively, the top of the second drying tower T2 is imported and exported, when replacement Treatment is carried out to the second drying tower T2 or the first drying tower T1, first pipeline 100 for regeneration gas being passed into the second drying tower T2 or the first drying tower T1, within being reduced to safe range to make the methane content in the second drying tower T2 or the first drying tower T1;
Second pipeline 200 in parallel with the first pipeline 100, one end of second pipeline 200 connects regeneration gas source of the gas, the other end of the second pipeline 200 connects the top import and export of the first drying tower T1 respectively, the top of the second drying tower T2 is imported and exported, second pipeline 200 is disposed with compressor C1 for supercharging regeneration gas by one end of the second pipeline 200 to the other end of the second pipeline 200, by the first cooler E2 of the regeneration gas cooling after supercharging, cooled regeneration gas is made to isolate the first separator V2 of moisture, the drying aid tower T3 that regeneration gas after isolating moisture is dewatered further, to the heater ET1 that the regeneration gas after dewatering further heats, when carrying out hot blow process to the second drying tower T2 or the first drying tower T1, the second pipeline 200 is for will through overcompression, cooling, isolate moisture, drying and dehydrating and the regeneration gas after being heated to 250 degrees Celsius import the second drying tower T2 or the first drying tower T1, to remove the moisture adsorbed in the second drying tower T2 or the first drying tower T1,
3rd pipeline 300, one end of 3rd pipeline 300 connects the bottom import and export of the first drying tower T1 respectively, the bottom of the second drying tower T2 is imported and exported, the other end of the 3rd pipeline 300 connects the air inlet of compressor C1, 3rd pipeline 300 is disposed with the second cooler E1 for cooling regeneration gas by one end of the 3rd pipeline 300 to the other end of the 3rd pipeline 300, cooled regeneration gas is made to isolate the second separator V1 of moisture, 3rd pipeline 300 is for by the first drying tower T1, the regeneration gas of discharging during the second drying tower T2 hot blow imports the second cooler E1 and cools, and cooled regeneration gas is imported the second separator V1 and isolate aqueous water, regeneration gas is imported compressor C1 supercharging afterwards, to make regeneration gas at compressor C1, between first drying tower T1 circulation or at compressor C1, circulate between second drying tower T2,
Emptying pipeline 10, is connected on the 3rd pipeline 300, for the gas in emptying first drying tower T1, the second drying tower T2.
The dewatering system of coal bed gas of the present invention, wherein, regenerating unit also comprises:
4th pipeline 400, one end of 4th pipeline 400 connects the bottom import and export of the first drying tower T1 respectively, the bottom of the second drying tower T2 is imported and exported, the other end of the 4th pipeline 400 is connected between the first separator V2 of the second pipeline 200 and drying aid tower T3,4th pipeline 400 for by through overcompression, the regeneration gas that cools, isolate moisture imports and exports through the bottom of the first drying tower T1 or importing first drying tower T1 or the second drying tower T2 is imported and exported, to carry out cold blowing process to the first drying tower T1 or the second drying tower T2 in the bottom of the second drying tower T2.
The dewatering system of coal bed gas of the present invention, wherein, regenerating unit also comprises:
5th pipeline 500, one end of 5th pipeline 500 is connected on the 3rd pipeline 300, the other end of the 5th pipeline 500 is connected between the first separator V2 of the second pipeline 200 and drying aid tower T3, cold blowing first drying tower T1, the regeneration gas of discharging during the second drying tower T2 enters drying aid tower T3 and carries out hot blow to drying aid tower T3 after heater ET1 heats, 5th pipeline 500 cools for regeneration gas being imported the second cooler E1, cooled regeneration gas enters the second separator V1 and isolates aqueous water, regeneration gas enters compressor C1 supercharging afterwards, to make regeneration gas at compressor C1, between first drying tower T1 or at compressor C1, circulate between second drying tower T2.
The dewatering system of coal bed gas of the present invention, wherein, the top of the first drying tower T1 is imported and exported, the top of the second drying tower T2 is imported and exported and is communicated with coalbed methane containing oxygen outlet respectively by the 6th pipeline 600, the 7th pipeline 700, is communicated with between the 6th pipeline 600, the 7th pipeline 700 by the 8th pipeline 800.
Above-mentioned regeneration gas preferred nitrogen also can be other inert gases.
Operationally, when one is in adsorption process in the first drying tower T1 and the second drying tower T2, then other one is in regenerative process to the dewatering system of coal bed gas of the present invention, two tower alternations.
When the first drying tower T1 is in adsorption process, then coalbed methane containing oxygen is exported after being dewatered by the first drying tower T1.When the second drying tower T2 needs to be switched to reproduced state from adsorption dewatering state, first need to replace the coalbed methane containing oxygen nitrogen in the second drying tower T2, residual gas in second drying tower T2 is discharged through emptying pipeline 10, then nitrogen enters the second drying tower T2 through the first pipeline 100, discharge through emptying pipeline 10, after a period of time, within the content of the methane in the second drying tower T2 can being reduced to safe range.
After second drying tower T2 replacement completion, enter the hot blow stage, the hot blow stage, nitrogen, through compressor C1 supercharging, after the first cooler E2 cools, enters the first separator V2 and isolates moisture, gas second pipeline 200 after supercharging enters drying aid tower T3 drying and dehydrating, dried nitrogen enters heater ET1 and is heated to 250 degrees centigrade, carries out hot blow to the second drying tower T2, to remove the moisture adsorbed in the second drying tower T2.The nitrogen that second drying tower T2 discharges enters the second cooler E1 by the 3rd pipeline 300 and cools, then enter the first separator and isolate aqueous water, last nitrogen enters compressor C1 supercharging, circulate, when the delivery temperature of the second drying tower T2 reaches 160 degrees centigrade, the hot blow stage terminates, and enters into next stage, i.e. cold blowing stage.
The cold blowing stage, nitrogen is through compressor C1 supercharging, after being cooled by the first cooler E2, enter the first separator V2 and isolate moisture, then the second drying tower T2 is entered by the 4th pipeline 400, second drying tower T2 is cooled, the gas that second drying tower T2 discharges enters heater ET1, gas after heating carries out hot blow to drying aid tower T3, drying aid tower T3 Exhaust Gas enters the second cooler E1, enter the second separator V1 again and isolate aqueous water, enter compressor C1 afterwards and complete a circulation.
After the second drying tower T2 cold blowing terminates, enter next stage, namely coalbed methane containing oxygen is all pressed, coalbed methane containing oxygen enters into the second drying tower T2 by the 8th pipeline 800, makes the pressure in the second drying tower T2 equal with the bleed pressure of coalbed methane containing oxygen, after pressure equalizing terminates, then the second drying tower T2 is switched to adsorbed state, when the second drying tower T2 enters into adsorbed state, then coalbed methane containing oxygen enters the second drying tower T2 and carries out drying and dehydrating, and the first drying tower T1 enters into reproduced state.Alternate cycles like this is carried out.
The dewatering system of coal bed gas of the present invention adopts the inert gases such as nitrogen to make regeneration gas, can improve the security of dewatering system like this.
The dewatering of coal bed gas of the present invention is particularly applicable to coalbed methane containing oxygen.
In the dewatering of coal bed gas of the present invention, the drying of coalbed methane containing oxygen adopts Dry Adsorption, and the regenerative process of drying tower adopts nitrogen Inner eycle flow process.After drying tower absorption is saturated, first replace coalbed methane containing oxygen remaining in its tower with nitrogen, then regenerated drying tower by circulating nitrogen gas, the nitrogen after regeneration returns the entrance of supercharger (compressor) after refrigerated separation.Owing to there is no oxygen and fuel gas in drying tower in dry run, therefore substantially increase security.When the dewatering system of coal bed gas of the present invention runs, regenerative process is closed cycle, only can lose a small amount of nitrogen at replacement process, and therefore nitrogen consumption is few, and system operation cost is low, energy-conserving and environment-protective.
The advantage of technical scheme of the present invention is:
1, first drying tower is replaced, the mixture of the air contained in tower and methane is replaced into nitrogen, when making the regeneration gas of high temperature carry out hot blow to drying tower, can not potential safety hazard be there is;
2, regeneration gas adopts nitrogen, avoids replacing the potential safety hazard thoroughly do not caused;
3, regeneration gas recycles, and loss is little, energy saving of system environmental protection.
Below be only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a dewatering for coal bed gas, is characterized in that, comprising:
Utilize the first drying tower to coalbed methane containing oxygen processed, meanwhile, the second drying tower replaced successively, hot blow, cold blowing and all press process;
Utilize the second drying tower to coalbed methane containing oxygen processed, meanwhile, the first drying tower replaced successively, hot blow, cold blowing and all press process.
2. the dewatering of coal bed gas as claimed in claim 1, is characterized in that, described second drying tower to be replaced successively, hot blow, cold blowing process and described first drying tower to be replaced successively, hot blow, cold blowing process all utilize nitrogen to carry out.
3. the dewatering of coal bed gas as claimed in claim 2, is characterized in that, describedly to replace successively the second drying tower, hot blow, cold blowing and all press process to comprise:
Nitrogen is utilized to carry out replacement Treatment to the coalbed methane containing oxygen in the second drying tower, comprise: the residual gas in described second drying tower is discharged, then nitrogen is passed into described second drying tower, discharge after a period of time, repeat aforesaid operations, until within the content of methane in described second drying tower is reduced to safe range;
Nitrogen is utilized to carry out hot blow process to the second drying tower, comprise: utilize compressor by nitrogen supercharging, nitrogen after supercharging enters the first separator and isolates moisture after the first cooler cooling, then nitrogen is passed into drying aid tower drying and dehydrating, after dry, nitrogen enters heater and is heated to 250 degrees Celsius and enters described second drying tower, hot blow is carried out to described second drying tower, to remove the moisture adsorbed in described second drying tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps, until the delivery temperature of described second drying tower reaches 160 degrees Celsius,
Nitrogen is utilized to carry out cold blowing process to the second drying tower, comprise: utilize described compressor by nitrogen supercharging, moisture is isolated by entering described first separator after described first cooler cooling, then nitrogen is passed into the second drying tower, second drying tower is cooled, afterwards nitrogen is imported described heater, nitrogen after heating is imported drying aid tower, the nitrogen after heating is utilized to carry out hot blow to drying aid tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps,
All process is pressed to the second drying tower, comprising: coalbed methane containing oxygen is passed into the second drying tower, make the pressure in described second drying tower equal with the pressure of the source of the gas of coalbed methane containing oxygen.
4. the dewatering of coal bed gas as claimed in claim 3, is characterized in that, describedly to replace successively the first drying tower, hot blow, cold blowing and all press process to comprise:
Nitrogen is utilized to carry out replacement Treatment to the coalbed methane containing oxygen in the first drying tower, comprise: the residual gas in described first drying tower is discharged, then nitrogen is passed into described first drying tower, discharge after a period of time, repeat aforesaid operations, until within the content of methane in described first drying tower is reduced to safe range;
Nitrogen is utilized to carry out hot blow process to the first drying tower, comprise: utilize compressor by nitrogen supercharging, nitrogen after supercharging enters the first separator and isolates moisture after the first cooler cooling, then nitrogen is passed into drying aid tower drying and dehydrating, after dry, nitrogen enters heater and is heated to 250 degrees Celsius and enters described first drying tower, hot blow is carried out to described first drying tower, to remove the moisture adsorbed in described first drying tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps, until the delivery temperature of described first drying tower reaches 160 degrees Celsius,
Nitrogen is utilized to carry out cold blowing process to the first drying tower, comprise: utilize described compressor by nitrogen supercharging, moisture is isolated by entering described first separator after described first cooler cooling, then nitrogen is passed into the first drying tower, first drying tower is cooled, afterwards nitrogen is imported described heater, nitrogen after heating is imported drying aid tower, the nitrogen after heating is utilized to carry out hot blow to drying aid tower, then nitrogen is imported the second cooler cooling, cooled nitrogen enters the second separator and isolates aqueous water, nitrogen enters described compressor boost afterwards, repeat above-mentioned steps,
All process is pressed to the first drying tower, comprising: coalbed methane containing oxygen is passed into the first drying tower, make the pressure in described first drying tower equal with the pressure of the source of the gas of coalbed methane containing oxygen.
5. a dewatering system for coal bed gas, is characterized in that, comprising:
For carrying out the first drying tower, second drying tower of processed to coalbed methane containing oxygen;
Regenerating unit, described regenerating unit is connected respectively with described first drying tower, the second drying tower, described regenerating unit is used for while the first drying tower is to coalbed methane containing oxygen processed, second drying tower is replaced, hot blow, cold blowing and all press process, while the second drying tower is to coalbed methane containing oxygen processed, the first drying tower to be replaced, hot blow, cold blowing and all press process.
6. the dewatering system of coal bed gas as claimed in claim 5, it is characterized in that, described regenerating unit comprises:
First pipeline, one end of described first pipeline connects regeneration gas source of the gas, the other end of described first pipeline connects the top import and export of described first drying tower respectively, the top of the second drying tower is imported and exported, when replacement Treatment is carried out to the second drying tower or the first drying tower, described first pipeline is used for regeneration gas being passed into described second drying tower or the first drying tower, within being reduced to safe range to make the methane content in described second drying tower or the first drying tower;
Second pipeline in parallel with described first pipeline, one end of described second pipeline connects regeneration gas source of the gas, the other end of described second pipeline connects the top import and export of described first drying tower respectively, the top of the second drying tower is imported and exported, described second pipeline is disposed with compressor for supercharging regeneration gas by one end of described second pipeline to the other end of described second pipeline, by the first cooler of the regeneration gas cooling after supercharging, cooled regeneration gas is made to isolate the first separator of moisture, make the drying aid tower that the regeneration gas after isolating moisture is dewatered further, to the heater that the regeneration gas after dewatering further heats, second pipeline described in when carrying out hot blow process to the second drying tower or the first drying tower is for will through overcompression, cooling, isolate moisture, drying and dehydrating and be heated to the regeneration gas after 250 degrees Celsius and import described second drying tower or the first drying tower, to remove the moisture adsorbed in the second drying tower or the first drying tower,
3rd pipeline, one end of described 3rd pipeline connects the bottom import and export of described first drying tower respectively, the bottom of described second drying tower is imported and exported, the other end of described 3rd pipeline connects the air inlet of described compressor, described 3rd pipeline is disposed with the second cooler for cooling regeneration gas by one end of described 3rd pipeline to the other end of described 3rd pipeline, cooled regeneration gas is made to isolate the second separator of moisture, described 3rd pipeline is used for described first drying tower, the regeneration gas of discharging during the second drying tower hot blow imports the second cooler cooling, and cooled regeneration gas is imported the second separator isolate aqueous water, afterwards described regeneration gas is imported described compressor boost, to make regeneration gas at described compressor, between described first drying tower circulation or at described compressor, circulate between described second drying tower,
Emptying pipeline, is connected on described 3rd pipeline, for the gas in emptying described first drying tower, the second drying tower.
7. the dewatering system of coal bed gas as claimed in claim 6, it is characterized in that, described regenerating unit also comprises:
4th pipeline, one end of described 4th pipeline connects the bottom import and export of described first drying tower respectively, the bottom of described second drying tower is imported and exported, between the first separator that the other end of described 4th pipeline is connected to described second pipeline and drying aid tower, described 4th pipeline be used for by through overcompression, the regeneration gas that cools, isolate moisture imports and exports through the bottom of described first drying tower or the bottom of the second drying tower is imported and exported and imported described first drying tower or the second drying tower, to carry out cold blowing process to described first drying tower or the second drying tower.
8. the dewatering system of coal bed gas as claimed in claim 7, it is characterized in that, described regenerating unit also comprises:
5th pipeline, one end of described 5th pipeline is connected on the 3rd pipeline, between the first separator that the other end of the 5th pipeline is connected to described second pipeline and drying aid tower, first drying tower described in cold blowing, the regeneration gas of discharging during the second drying tower enters drying aid tower and carries out hot blow to drying aid tower after described heater heating, 5th pipeline is used for described regeneration gas being imported the second cooler cooling, cooled regeneration gas enters the second separator and isolates aqueous water, regeneration gas enters described compressor boost afterwards, to make described regeneration gas at described compressor, between described first drying tower circulation or at described compressor, circulate between described second drying tower.
9. the dewatering system of coal bed gas as claimed in claim 8, it is characterized in that, the top of described first drying tower is imported and exported, the top of the second drying tower is imported and exported respectively by the 6th pipeline, the 7th pipeline connection coalbed methane containing oxygen outlet, by the 8th pipeline connection between described 6th pipeline, described 7th pipeline.
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