CN101554560A - Method for treating coal bed gas at low pressure - Google Patents
Method for treating coal bed gas at low pressure Download PDFInfo
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- CN101554560A CN101554560A CNA200810103626XA CN200810103626A CN101554560A CN 101554560 A CN101554560 A CN 101554560A CN A200810103626X A CNA200810103626X A CN A200810103626XA CN 200810103626 A CN200810103626 A CN 200810103626A CN 101554560 A CN101554560 A CN 101554560A
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Abstract
The invention relates to a method for treating coal bed gas at low pressure, comprising the following steps: coal bed gas with volume fraction of methane more than 30 percent is led into a hydration reactor and contacts with hydrate working solution in the hydration reactor, so that one part of the coal bed containing methane forms hydrate, the volume fraction of the methane in the coal bed is reduced to obtain gas phase tail with low methane concentration, the volume fraction of the methane in the gas phase tail with low methane concentration is more than 15 percent, and the gas phase tail with low methane concentration is led out of the hydration reactor and then can be conveyed to a power generation system, wherein the operation pressure of the hydration reactor is 0.11Mpa to 0.85Mpa, while the operation temperature is 3 DEG C to 18 DEG C. The method can safely treat coal bed gas containing oxygen at lower pressure, comprehensively utilize the coal bed gas and improve economic benefits.
Description
Technical field
The present invention relates to a kind of method of handling coal bed gas, specifically, the present invention relates to a kind of method that generates hydrate of under the low pressure condition, utilizing coalbed methane containing oxygen is handled so that coal bed gas obtains comprehensive utilization method.
Background technology
In the coal seam, majority all is attended by coal bed gas, and coal bed gas mainly comprises two kinds, and a kind of is the coal bed gas that ground is extracted, and the methane content in this coal bed gas generally＞90% is easy to handle and utilize; Another kind is the coal bed gas that the down-hole is extracted, and also claims Device in Gas, wherein is mixed with a large amount of air, and methane content is low, generally about 5%～60%.Because the explosion limit of methane is 5%～15%, thereby the utilization of Device in Gas has sizable difficulty and risk, and a large amount of wastes usually with the direct emptying of Device in Gas, has been caused in the colliery.And methane is the very strong gases of a kind of greenhouse effects simultaneously, and its greenhouse effects are about CO
221 times, in atmospheric environment, methane up to 18%, is only second to CO to the contribution rate of Global Greenhouse Effect
2It is reported that the methane of the movable annual discharging of world's coal mining accounts for 5%～8% of global discharge of methane amount, and China's coal bed gas annual emissions accounts for 1/4 of the whole world; Be about 27x10 according to another the total amount of estimating China's coal bed gas
12m
3Utilize these coal bed gas rationally and effectively, no matter for safety in production or environmental protection, all significant.
CN85103557B discloses and has a kind ofly utilized pressure swing adsorption to separate from coal mine mash gas and the method for enrich methane, but, the oxygen content of methane discharging waste gas in concentrating purification process also is concentrated raising, the scope that the methane mole fraction can be formed through 5%～15% explosion gas inevitably in the waste gas, make to have explosion danger in the discharging waste gas pipeline all the time, scheme is difficult to implement.
CN1873285A discloses a kind of method of utilizing hydrate to carry out coal bed gas enrichment and accumulating; this method mainly be low temperature (260～285K), high pressure is (under the 2MPa～10MPa); utilization makes the methane in the coal bed gas separate concentrated methane with the method that water forms methane hydrate; this major issue that has contained oxygen but this method has been avoided often being mixed with air in the coal bed gas does not all have O in the composition of handled coal bed gas in the embodiment
2Because form by actual Device in Gas, under the pressure of the 2MPa～10MPa that is given, nearly all be within the explosion limit of methane in the method, safety in production is difficult to realize.
CN1718680A has proposed to reach the purpose of separating purification methane with the method for liquefaction coal bed gas with CN1952569A.But avoided oxygen containing problem in the coal bed gas in the CN1718680A disclosed method, only mentioned the way that adopts deoxidation and remove oxygen in the coal bed gas earlier; Then limit oxygen in the coal bed gas in the CN1952569A disclosed method less than 2%.Adopt the method for cryogenic liquefying Device in Gas to come the purification separation coal bed gas, under the 0.1MPa absolute pressure, CH
4, N
2, O
2And CO
2Boiling point be respectively-162 ℃ ,-196 ℃ ,-133 ℃ and-78 ℃, that is, must be lower than could be with the most difficult N that removes under-162 ℃ the cryogenic conditions
2Remove, if oxygen and CO in the coal bed gas
2The content height, under-162 ℃, oxygen and CO
2Can be on refrigeration plant freeze and occluding device and reduction freezing capacity reach 40%～60% Device in Gas for air content, liquefaction needs very high energy consumption and high cost of equipment.
And catalytic deoxidation process is generally adopted in the deoxidation in the coal bed gas, this technology mainly is to use dehydrogenation catalyst at 300 ℃ of left and right sides oxygen and methane reaction and be removed, generally removing 1% oxygen can make beds rise 150 ℃, and the heatproof upper limit of catalyst is generally about 500 ℃, every section deoxidation limit is about 1.5%, in case thereby oxygen content is very high in the coal bed gas, just require the multistage deoxidation, complex process not only, operating difficulties is gone back the big calorimetric of by-product simultaneously, and 1% oxygen consumes 0.5% methane simultaneously, cause the methane yield low, production is implemented uneconomical.
At present, the gas electricity technology has been a mature technique comparatively in China.Gas electricity unit manufacturer---Shengli Oil Field dynamic power machine group company, can produce and utilize low concentration gas (wherein methane concentration 6%～25%) generating set, Huainan Mining Group and Shengli Oil Field dynamic power machine group company thanked to an ore deposit in Huainan Mining Area and built the low concentration gas power plant in September, 2005, carry out the thin water smoke conveyer of low concentration gas generation technology type approval test, methane concentration is about 10% in the used Device in Gas, and test has obtained comparatively and completed success.In gas electricity industry, for avoiding the explosion limit of methane, improve production security, actual is to generate electricity with the Device in Gas of methane concentration about 15%～25%.Because the economic benefit of generating electricity with Device in Gas is not very high,,, the economic worth height that methane-rich is wherein got up to produce natural gas will be can not show a candle to if be used for generating for the higher methane concentration Device in Gas of methane concentration 〉=30% for example.
Therefore, seek the method that other handles coal bed gas safely, for utilizing coal bed gas rationally and effectively, improving the business economic benefit, significant.
Summary of the invention
One object of the present invention is to provide a kind of method of low-pressure processing of coal bed gas, to handle especially coalbed methane containing oxygen of coal bed gas safely under the lower pressure condition, improves production security.
Another object of the present invention is to provide a kind of method of low-pressure processing of coal bed gas,, in safety operation, reduce the energy consumption of process and the operation easier of process under the lower pressure condition, coal bed gas is handled.
Another object of the present invention is to provide a kind of method of low-pressure processing of coal bed gas, under the lower pressure condition, coal bed gas is handled, make coal bed gas obtain comprehensive utilization, and resource and energy are fully used by process optimization, reduce production costs, increase economic benefit.
According to the method for low-pressure processing of coal bed gas provided by the present invention, specifically be a kind of method that the method for utilization generation hydrate is handled coal bed gas under the low pressure condition.It is generally acknowledged in the prior art that hydrate forms under uniform temperature and certain condition of high voltage, methane generates the pressure of hydrate up to 30 atmospheric pressure during as put down in writing among the CN1272618A 1 ℃; And along with the rising of temperature, the pressure that methane generates hydrate will increase.And the inventor finds: under lower pressure, when the coal bed gas that contains methane contacts with the hydrate working solution that contains methane hydrate generation promoter, when forming hydrate, methane in the coal bed gas will enter in the hydrate and be pulled away, thereby can realize separating of other component in methane and the coal bed gas.On this basis, the invention provides a kind of method of low-pressure processing of coal bed gas, the method comprising the steps of:
Coal bed gas is introduced hydration reactor, contact with the hydrate working solution in the hydration reactor, make the part of contained methane in the coal bed gas form hydrate, and being lowered, methane volume fraction in the coal bed gas obtains low methane concentrations gas phase tail gas (with raw material coal seam gas phase ratio, methane concentration is low and be called " low methane concentrations " in the gas phase tail gas), and in this low methane concentrations gas phase tail gas the methane volume fraction greater than 15%;
Wherein, the operating pressure of described hydration reactor is 0.11MPa～0.85MPa (pressure among the present invention is absolute pressure), and operating temperature is 3～18 ℃.
Method of the present invention mainly is the coal bed gas to methane volume fraction 〉=30%, and particularly the methane volume fraction is 30%～60% Device in Gas, handles.This class coal bed gas is because the lower and very difficult realization of methane concentration is used for industrial production pipe gas, compressed natural gas (CNG) or liquefied natural gas (LNG), if the economic benefit that is used to generate electricity is also lower.And utilize method of the present invention, and can make the methane in the coal bed gas in hydrate, obtain enrichment, increase economic efficiency.
In addition, normally be mixed with air in the coal bed gas of this class methane volume fraction 30%～60% and contain oxygen.Because along with the raising of pressure, the explosive range of methane significantly enlarges in the coal bed gas, will produce material impact to safety in production, for the coalbed methane containing oxygen that is in explosive range or close concentration, must be limited in the following operation of 0.85MPa.And the method for processing coal bed gas of the present invention, very low (the 0.11MPa～0.85MPa) of operating pressure, satisfy the safety requirements of handling coalbed methane containing oxygen, therefore, method of the present invention is specially adapted to handle oxygenous coal bed gas, before the coal gas layer is introduced hydration reactor, can carry out deoxidization technique to remove oxygen wherein to coal bed gas.According to preferred specific embodiments of the present invention, before entering hydration reactor, described coal bed gas can be compressed to pressure 0.11MPa～0.85MPa by compressor earlier, and enters in the hydration reactor behind heat exchange to 3～18 ℃ again, contacts with the hydrate working solution hydration reaction takes place.
Utilization of the present invention generates hydrate and handles in the method for coal bed gas under the low pressure condition, the described concrete working solution that is used to generate hydrate can suitably be selected and determines for a person skilled in the art according to the record of prior art.For example, described hydrate working solution is moisture solution, generally speaking, for generation that promotes methane hydrate and the generation pressure that further reduces hydrate, in described hydrate working solution, be added with thermodynamics promoter for example oxolane, pentamethylene, acetone, oxirane etc. usually; In order to improve the speed that hydro-combination process carries out, can in the hydrate working solution, add dynamics promoter for example neopelex, cetyl benzene sulfonic acid sodium salt and/or lauryl sodium sulfate etc.; When needing that in the serialization production process hydrate that is generated drawn hydration reactor, noncondensingly behind the hydrate become big solid block in order to guarantee that water in the hydrate working solution generates, in order to avoid occluding device pipeline, the steady and continuous that is beneficial to process is carried out, satisfy the large-scale industrial application needs, can in the hydrate working solution, add for example oily substances such as C2～C5 hydro carbons, kerosene, gasoline, diesel oil or silicone oil of oil-phase solution; In order to make aqueous phase solution and oil-phase solution in the hydrate working solution form emulsion better, also can in the hydrate working solution, add for example serial emulsifying agent of this dish (Span) etc. of surfactant.The concrete selection of these promoter, oily substance, surfactant and consumption all can be determined according to the record of prior art or by simple experiment for a person skilled in the art.
According to preferred specific embodiments of the present invention, when utilizing method of the present invention that coal bed gas is handled, pending coal bed gas is to enter hydration reactor from the hydration reactor bottom, pass through hydration reactor from bottom to top, with hydrate working solution counter current contacting from the hydration reactor top, water water generation reaction compound in methane in the coal bed gas and the hydrate working solution and enter in the hydrate working solution and to form the slurries that mix with the hydrate working solution, and the methane concentration in the up coal bed gas is reduced.
In the method for processing coal bed gas of the present invention, can control the methane concentration in the tail gas after coal bed gas is absorbed methane by suitably adjusting hydration reaction condition (for example adjusting hydration reactor tower height, the column plate number of plies, hydrate working solution spray hop count, hydration progression, coal bed gas and work liquid measure ratio etc.), concrete process conditions and parameter are for a person skilled in the art, after reading specification of the present invention, also be can be according to the record of prior art or by simple experiment and definite.Existing in the technology of enrich methane from coal bed gas, normally make every effort to the more methane of enrichment from coal bed gas and make the methane concentration in the tail gas low as far as possible.And be to limit the volume fraction of methane in the low methane concentrations gas phase tail gas that obtains after methane in the coal bed gas is absorbed by hydration greater than 15% among the present invention, can effectively avoid the blast problem of coalbed methane containing oxygen on the one hand, improve production security; On the other hand, owing to do not need the methane in the raw material coal bed gas was reduced to low concentration, can reduce the hydration reactor tower height in the method for the present invention, reduce the column plate number of plies, must not carry out multisection type spray working solution, must not carry out secondary hydration or more multistage hydration etc., can reduce equipment investment and loss, thereby method of the present invention can reduce the energy consumption of process and the operation easier of process in safety operation, reduce production costs, increase economic efficiency.In addition, this methane volume fraction also can be used for generating (being used for generating after can suitably adjusting methane concentration wherein as required) greater than 15% gas phase tail gas, makes coal bed gas obtain comprehensive utilization.That is, according to specific embodiments of the present invention, the method for low-pressure processing of coal bed gas of the present invention also can comprise step: the low methane concentrations gas phase tail gas that obtains in the hydration reactor is drawn hydration reactor, be delivered to electricity generation system.
According to specific embodiments of the present invention, in the method for low-pressure processing of coal bed gas of the present invention, the methane hydrate that obtains in the described hydration reactor can be directly as commodity selling, also can further be dissolved and be discharged high methane concentration gas (with raw material coal seam gas phase ratio, it is high and be called " high methane concentration " that this hydrate is dissolved in the gas stream that obtains methane concentration).Particularly, the method of low-pressure processing of coal bed gas of the present invention also can comprise step: the hydrate introducing hydrate that forms in the hydration reactor is dissolved device dissolve, form high methane concentration gas stream and hydrate working solution liquid stream, also the hydrate working solution liquid stream drawing-off water compound that forms can being dissolved device, to return hydration reactor after liquid circulation pump boosts recycling.More particularly, the operating pressure that described hydrate is dissolved device is 0.1MPa～0.25MPa, and operating temperature is 8～23 ℃.
In the method for low-pressure processing of coal bed gas of the present invention, also can control the enrichment degree of methane in hydrate, promptly control the volume content of methane in the high concentration methane that obtains after hydrate is dissolved by suitably adjusting hydration reaction condition (as hydration reactor tower height, the column plate number of plies, hydrate working solution spray hop count, hydration progression, coal bed gas and working solution internal circulating load ratio etc.).According to preferred specific embodiments of the present invention, be to make described hydrate dissolve volume fraction 〉=80% of methane in the high methane concentration gas stream of formation.This high methane concentration gas stream can be transported to fuel gas system or sell as the compressed natural gas product through the overcompression processing, or is used to produce liquefied natural gas through further concentrating with deoxidation treatment.That is, the method for low-pressure processing of coal bed gas of the present invention also can comprise step: the high methane concentration gas stream drawing-off water compound of described hydrate being dissolved formation is dissolved device, is delivered to pipe gas, CNG and/or LNG production system.
In addition, the present invention also optimizes the technical process of handling coal bed gas, so that resource and energy are fully used, further reduces production costs, and increases economic benefit.In the technology of optimizing, the needed cold of described hydration reaction can come from the low methane concentrations gas phase tail gas that obtains in raw material coal bed gas and/or the hydration reactor, also can come from power plant on every side or other factories and utilize coal bed gas to make the cold that the cold that fuel obtains and/or the high-temperature tail gas that utilizes the coal bed gas generating obtain; Described hydrate dissolve required heat can come from on-the-spot and around using waste heat from tail gas, the afterheat of hot water and/or the coalbed methane containing oxygen catalytic deoxidation waste heat of power plant steam on every side of any fuel gas generation; Exchange and the recovery of heat exchanger to realize described heat and/or cold can be set on the pipeline of technological process as required.Some heats and the cold of wherein said power plant have normally wasted in actual production at present, and these heats and cold are used for process of the present invention, can't the normal operation of power plant be exerted an influence, reached making full use of of resource and energy simultaneously.
According to preferred specific embodiments of the present invention, the methane volume fraction preferably is controlled at 15%～25% in the low methane concentrations gas phase tail gas that obtains in the described hydration reactor, this low methane concentrations gas phase tail gas can directly be used to generating, also can suitably dilute or additional methane after be used for generating (described dilution methane can be by mixing with the part air, described additional methane can by for example raw material coal bed gas or hydrate are dissolved the high methane concentration gas that obtains and mixed with the gas of the higher methane concentration of part); The electric power that generating is produced can be used for the process of low-pressure processing of coal bed gas of the present invention, drives the conveying of hydrate working solution and/or coal bed gas, for example is used to drive the electric pump of hydrate working solution and/or the compressor of compression coal bed gas etc.
Key of the present invention has been to provide a kind of process of low-pressure processing of coal bed gas, used appliance arrangement hydration reactor, hydrate as described dissolved device, heat exchanger, compressor, circulating pump and set connecting pipeline (pipeline) in this technology, optionally set valve and gauge table etc. all can adopt the conventional design in this field, and the present invention no longer gives unnecessary details the concrete structure and the design of these appliance arrangements.
In sum, the invention provides a kind of particularly method of coalbed methane containing oxygen of coal bed gas of handling, this method has broken through the water past compound and has generated the restriction that must under high pressure carry out, can lower pressure (0.11～0.85MPa) and temperature (3～18 ℃) condition that is fit under make the methane in the coal bed gas generate hydrate, improve production security, and can in safety operation, reduce the energy consumption of process and the operation easier of process; In the method for the present invention, the raw material coal seam is so incensed that to sufficient comprehensive utilization, and the tail gas that contains methane that does not discharge in air is significant for environmental protection; Utilize method of the present invention, described raw material coal bed gas can obtain the product of enrich methane after treatment, and the tail gas of the low methane concentrations that obtains simultaneously can be used for generating, compares with directly the raw material coal bed gas being used for generating, and productivity effect will improve greatly; The present invention is also by process optimization, and the coalbed methane containing oxygen of different methane concentrations and technical process tail gas fully utilize in generating, heating and refrigeration, and resource and energy are fully utilized, and reduce production costs, and increase economic benefit.In addition, simple, easy to operate, the safety of method technology of the present invention needs public work few, and not only environmental benefit is good, the more important thing is also to have big economic benefit.
Description of drawings
Fig. 1 is a process flow diagram of handling the method for coal bed gas described in the embodiment of the invention 1;
Fig. 2 is a process flow diagram of handling the method for coal bed gas described in the embodiment of the invention 2;
Fig. 3 is a process flow diagram of handling the method for coal bed gas described in the embodiment of the invention 3.
The specific embodiment
Below by preferred exemplary embodiment and conjunction with figs. apparatus and method of the present invention and beneficial effect thereof are described in further detail.
See also the technological process of the method for the processing coal bed gas in the present embodiment shown in Figure 1, the raw material coal bed gas is a methane volume content 50%, all the other are the Device in Gas of air, after the compressed machine 1 of this raw material coal bed gas is compressed to 0.3MPa, the gas distributor 21 that is provided with by hydration reactor (absorption tower) 2 bottoms is distributed in the hydration reactor 2, hydrate working solution counter current contacting under with nozzle 22 sprays that are provided with from hydration reactor 2 tops, the hydrate working solution is the aqueous solution that contains the 15wt% oxolane, hydrate working solution temperature is 4 ℃ and (adopts the cold-producing medium refrigeration, can control by temperature regulating device), cold derives from coal bed gas generator high-temperature tail gas (utilizing high-temperature tail gas to produce refrigeration mechanism cryogen cold).In hydration reactor 2, the water in methane in the coal bed gas and the hydrate working solution forms the methane hydrate crystallization.Methane concentration is about 20% in the gas phase tail gas after methane is lowered in the control coal bed gas in the present embodiment, and this tail gas is transported to electricity generation system after hydration reactor 2 cats head are discharged.In the hydration reactor 2, the methane hydrate that generates is to exist with the form of unreacted hydrate working solution with slurries, this hydrate slurry is extracted out from hydration reactor 2 by hydrate slurry liquid pump 3, enter hydrate and dissolve device (decomposition tower) 4, under heat exchange agent (from the hot water in peripheral power plant) heating, decomposite high methane concentration gas stream and hydrate working solution liquid stream, high methane concentration gas stream (the methane volumetric concentration is slightly larger than 90%) is transported to the LNG production system, hydrate working solution liquid stream is extracted out through heat exchange cooling temperature control is laggard by liquid circulation pump and is gone into hydrate work tank 5, hydrate working solution in the work tank 5 is pumped in the hydration reactor 2, contact the generation hydration reaction with coal bed gas, the surplus liquid of the unreacted hydrate working solution in hydration reactor 2 bottoms can enter work tank 5 after tower bottom is drawn out of.In the present embodiment, used pump and compressor electricity consumption can be from the coal bed gas generators.The technological process of present embodiment is simple, handling safety, and energy consumption is low, and the raw material coal seam is so incensed that to comprehensive comprehensive utilization, economic benefit height.
See also the technological process of the method for the processing coal bed gas in the present embodiment shown in Figure 2, the raw material coal bed gas is 40% for the methane volume content, all the other are the Device in Gas of air, the compressed machine 1 of this raw material coal bed gas is compressed to 0.2MPa, and add a certain amount of liquefied petroleum gas (oil gas pressure 0.2MPa, addition is 10% (V/V) of raw material coal bed gas, can promote the generation of methane hydrate) laggardly go into hydration reactor 2 (two-stage absorption tower), hydrate working solution counter current contacting under with nozzle 22 sprays that are provided with from hydration reactor 2 tops, the hydrate working solution is the aqueous solution that contains the 20wt% oxolane, and hydrate working solution temperature is 4 ℃.In the present embodiment, adopt two-period form spray (two-stage absorption), coal bed gas wherein methane and the crystallization of the formation of the water in hydrate working solution methane hydrate after two-stage absorbs, the methane volume content slightly＞20% in the control tail gas, this tail gas be transferred electricity generation system after the part material coal bed gas is mixed.The methane hydrate slurries that generate in the hydration reactor 2 (hydrate mainly is distributed in the middle and upper part of holding liquid in the hydration reactor and divides and the formation slurries) are squeezed into hydrate through hydrate slurry liquid pump 3 and are dissolved device (decomposition tower) 4, dissolve in the device 4 at hydrate and to be added thermal decomposition by heat exchange agent (from the high-temperature tail gas of gas electricity machine), decomposite high methane concentration gas stream and hydrate working solution liquid stream, high methane concentration gas stream (the methane volumetric concentration omits＞80%) is sent to the pipe gas production system, and hydrate working solution liquid stream is pumped out after heat exchanger heat exchange cooling and gets back to hydrate work tank 5.The hydrate working solution extracts from work tank 5 that heat exchange cooling temperature control is laggard goes in the hydration reactor 2 out, and the surplus liquid of the unreacted hydrate working solution in hydration reactor 2 bottoms (can contain a spot of hydrate) can be extracted out from the tower bottom directly return work tank 5.The technological process handling safety of present embodiment, easy, and the raw material coal seam is so incensed that to comprehensive comprehensive utilization, economic benefit height.
See also the technological process of the method for the processing coal bed gas in the present embodiment shown in Figure 3, the raw material coal bed gas is a methane content 35%, all the other are the Device in Gas of air, the compressed machine 1 of this raw material coal bed gas is forced into that 0.35MPa is laggard to go in the hydration reactor (two-stage absorption tower) 2, hydrate working solution counter current contacting under with nozzle 22 sprays that are provided with from hydration reactor 2 tops generates hydrate, the hydrate working solution is the aqueous solution that contains the 30wt% oxolane, and it is 3 ℃ that control hydrate working solution absorbs temperature.In the present embodiment, the methane volumetric concentration is about 25% in the gas phase tail gas after methane is lowered in the control coal bed gas, and this tail gas is discharged entrance pressure difference refrigerating plant from hydration reactor 2 cats head and reclaimed cold, goes the coal bed gas generator for electricity generation then.The methane hydrate slurries that form in the hydration reactor 2 enter hydrate through hydrate slurry liquid pump 3 to be dissolved in the device (decomposition tower) 4, under heat exchange agent (from the low-pressure steam of peripheral power plant) heating, decomposite high methane concentration gas stream and hydrate working solution liquid stream, methane volumetric concentration in the high methane concentration gas stream is slightly larger than 80% at this moment, this high methane concentration gas stream is forced into 0.6MPa and enters deoxidation reactor 8 through heat exchanger 7 heat exchange to 250～500 ℃ through compressor 6, at Pt-Pd/Al
2O
3Remove O under the deoxidier effect
2To O
2Volumetric concentration＜0.5% enters transformation absorption (PSA) device 9 after the heat exchange cooling then, and the methane volumetric concentration that obtains in the PSA device 9 enters the LNG process units greater than 95% logistics, and PSA tail gas goes the coal bed gas generator for electricity generation.The hydrate working solution liquid stream that hydrate is dissolved in the device 4 is entered work tank 5 by liquid circulation pump extraction (can suitably pump up) part after the heat exchange cooling, a part directly enters the top one-level in the two-stage absorption tower 2, and the surplus liquid of the unreacted hydrate working solution in 2 bottoms, absorption tower can overflow from the tower bottom and directly return work tank 5.The technological process handling safety of present embodiment, easy has made full use of resource and energy, the economic benefit height.
Though above-mentioned invention has been described in conjunction with preferred exemplary; those skilled in the art can make recombinant, modification or the variation of various equivalences to each technical characterictic of the present invention in the scope of connotation of the present invention, these recombinants, modifications and variations ought to fall into the scope that the present invention should protect.
Claims (10)
1. the method for a low-pressure processing of coal bed gas, the method comprising the steps of:
The coal bed gas of methane volume fraction 〉=30% is introduced hydration reactor, contact with the hydrate working solution in the hydration reactor, make the part of contained methane in the coal bed gas form hydrate, obtain low methane concentrations gas phase tail gas and methane volume fraction in the coal bed gas is lowered, and in this low methane concentrations gas phase tail gas the methane volume fraction greater than 15%;
Wherein, the operating pressure of described hydration reactor is 0.11MPa～0.85MPa, and operating temperature is 3～18 ℃.
2. method according to claim 1, this method also comprises step:
The low methane concentrations gas phase tail gas that obtains in the hydration reactor is drawn hydration reactor, be delivered to electricity generation system.
3. method according to claim 1, this method also comprises step:
The hydrate introducing hydrate that forms in the hydration reactor is dissolved device to be dissolved, form high methane concentration gas stream and hydrate working solution liquid stream, and the hydrate working solution liquid stream drawing-off water compound that forms dissolved device, it is recycling to return hydration reactor after liquid circulation pump boosts.
4. method according to claim 3, this method also comprises step:
Described hydrate is dissolved the high methane concentration gas stream drawing-off water compound of formation and dissolved device, be delivered to pipe gas, CNG and/or LNG production system.
5. according to each described method of claim 2～4, wherein, utilize described low methane concentrations gas phase tail gas to be transported to the electric power that is produced after the electricity generation system, drive the conveying of hydrate working solution and/or coal bed gas.
6. method according to claim 3, wherein, the operating pressure that described hydrate is dissolved device is 0.1MPa～0.25MPa, operating temperature is 8～23 ℃.
7. method according to claim 3, wherein, described hydrate is dissolved methane volume fraction 〉=80% in the high methane concentration gas stream of formation.
8. method according to claim 3, wherein, hydrate is dissolved the using waste heat from tail gas that required heat comes from fuel gas generation, the afterheat of hot water and/or the coalbed methane containing oxygen catalytic deoxidation waste heat of power plant steam.
9. method according to claim 1, wherein, the required cold of hydration reaction comes from the cold that the low methane concentrations gas phase tail gas, the coal bed gas that obtain in raw material coal bed gas, the hydration reactor are made the cold of fuel acquisition and/or utilized the high-temperature tail gas acquisition of coal bed gas generating.
10. method according to claim 1, wherein, handled coal bed gas is oxygenous coal bed gas, the volume fraction of methane is 30%～60% in this coal bed gas.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101943321A (en) * | 2010-08-19 | 2011-01-12 | 中国石油大学(北京) | Method and device for delivering marsh gas |
| CN103388487A (en) * | 2013-08-12 | 2013-11-13 | 上海理工大学 | Recovery device for methane in mine discharged air and application thereof |
| CN103881775A (en) * | 2014-04-02 | 2014-06-25 | 安徽理工大学 | Preparation and energy recycling system of coal-bed gas hydrate |
| CN107880960A (en) * | 2017-11-22 | 2018-04-06 | 中能冰气能源科技（北京）有限公司 | Device in Gas alkane hydrate method of purification and system |
| CN107903969A (en) * | 2017-11-29 | 2018-04-13 | 常州大学 | A kind of device that methane in mixed empty coal bed gas is continuously separated using hydrate |
| CN108441273A (en) * | 2018-04-02 | 2018-08-24 | 东北大学 | Oxygen-containing low concentration combustible gas method of deoxidation and deoxygenation system |
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| CN100387691C (en) * | 2005-02-03 | 2008-05-14 | 石油大学(北京) | Method for generating aqua compound |
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| CN110577851A (en) * | 2019-09-12 | 2019-12-17 | 华南理工大学 | device and method for quickly and continuously hydrating and separating coal bed gas |
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