CN208898830U - A kind of Gas Dehydration System with pre-dehydration module - Google Patents
A kind of Gas Dehydration System with pre-dehydration module Download PDFInfo
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- CN208898830U CN208898830U CN201821340701.XU CN201821340701U CN208898830U CN 208898830 U CN208898830 U CN 208898830U CN 201821340701 U CN201821340701 U CN 201821340701U CN 208898830 U CN208898830 U CN 208898830U
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- dehydration
- molecular sieve
- gas
- heat exchanger
- pipeline connection
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Abstract
The utility model discloses a kind of Gas Dehydration System with pre-dehydration module, pre-dehydration module includes precool heat exchanger device, pre-dehydration gas-liquid separator；Molecular sieve dehydration module includes the first molecular sieve water separation tower, regenerating molecular sieve module includes booster compressor, heating heat exchanger, booster compressor is attached with pipe defeated outside natural gas, booster compressor is connect with heating heat exchanger, the bottom port of heating heat exchanger and the first molecular sieve water separation tower is attached, the top port of first molecular sieve water separation tower is attached with air cooler, and air cooler is attached with precool heat exchanger device.The utility model dewatering system installs pre-dehydration module additional before molecular sieve dehydration, on the one hand the inlet temperature that natural gas enters molecular sieve water separation tower is reduced, improve the dehydrating effect of molecular sieve, another aspect natural gas cooling make containing vapor pre-cooling condense into liquid water, it sloughs immediately, plays the purpose of pre-dehydration.
Description
Technical field
The utility model relates to natural gas dehydration technique fields, and in particular to a kind of natural qi exhaustion with pre-dehydration module
Water system.
Background technique
In petrochemical industry, the natural gas produced from gas well mostly contains saturated water, or even carries liquid water, and natural
The presence of moisture is very unfavorable to the transmission of natural gas in gas, for example, containing CO2And H2The natural gas of S is with the presence of water the case where
Lower formation is sour and corrodes pipeline and equipment；It forms gas hydrates under certain condition and blocks valve, pipeline and equipment；Drop
Low pipeline transmission capacity causes unnecessary power consumption.Therefore, it is needed before being transmitted from the natural gas that gas well produces advanced
Row dehydration.
Currently, the method for gas dehydration generally comprises low temperature process, solvent absorption, solid absorption method, chemical reaction method
With membrane separation process etc..Wherein, solid absorption method is applied in gas industry wide at present, and solid absorption method is made in gas
Water vapor adsorption achieve the purpose that dehydration on the adsorbents such as molecular sieve, silica gel, currently, it is widely used be using point
Son sieve adsorption dewatering.
But the natural gas being dehydrated into molecular sieve water separation tower requires greatly compressor and carries out pressurized treatment, due to pressure
The delivery temperature of contracting machine is higher, and the natural gas of high temperature enters molecular sieve water separation tower, will lead to the reduction of molecular sieve adsorption ability, from
And make gas dehydration efficiency, so as to cause subsequent low temperature to take off the frozen block of hydrocarbon module.
Utility model content
Purpose of the utility model is to overcome the deficiencies of the above prior art and provide a kind of days with pre-dehydration module
Right qi exhaustion water system.
To achieve the above object, the utility model adopts the following technical solutions: a kind of natural gas with pre-dehydration module
Dewatering system, including pre-dehydration module, molecular sieve dehydration module, regenerating molecular sieve module；
The pre-dehydration module includes precool heat exchanger device, pre-dehydration gas-liquid separator, the gas phase of the precool heat exchanger device into
Mouth end is attached with natural gas line, the gaseous phase outlet end of the precool heat exchanger device and the input end of pre-dehydration gas-liquid separator
Pipeline connection is carried out, the cryogen arrival end of the precool heat exchanger device and cryogen outlet end carry out pipeline company with refrigerant cycle module
It connects；
The molecular sieve dehydration module includes the first molecular sieve water separation tower, the top port of first molecular sieve water separation tower
Pipeline connection, first molecular sieve water separation tower are carried out by the gaseous phase outlet end of the first intake valve and pre-dehydration gas-liquid separator
Bottom port be attached by first row air valve and pipe defeated outside natural gas；
The regenerating molecular sieve module includes booster compressor, heating heat exchanger, and the arrival end of the booster compressor is logical
It crosses defeated pipe outside regenerating valve and natural gas and carries out pipeline connection, the outlet end of the booster compressor and the gas phase of heating heat exchanger
Input end carries out pipeline connection, and the gaseous phase outlet end of the heating heat exchanger is de- by the first regenerative intake valve and the first molecular sieve
The bottom port of water tower carries out pipeline connection, the top port of first molecular sieve water separation tower by the first regeneration air outlet valve with
The arrival end of air cooler carries out pipeline connection, and the outlet end of the air cooler and the gas phase input end of precool heat exchanger device carry out pipeline
Connection；The hot inlet end and hot outlets end of the heating heat exchanger carry out pipeline connection with hot fluid circulation module.
Preferably, the liquid-phase outlet end of the pre-dehydration gas-liquid separator by liquid phase dump valve and sewage-treatment plant into
The connection of row pipeline.
Preferably, the refrigerant cycle module includes refrigerant compressor, cold water storage cistern, throttle valve；The refrigerant compressor
The cryogen outlet end of entrance and precool heat exchanger device carries out pipeline connection, and the outlet of the refrigerant compressor passes through refrigerant cycle pipeline
It is connected to the cryogen arrival end of precool heat exchanger device, the refrigerant cycle pipeline of the refrigerant compressor outlet end is carried out across cold water storage cistern
Water-cooled cooling, the refrigerant cycle pipeline are equipped with throttle valve.
Preferably, first filter is equipped between the pre-dehydration gas-liquid separator and the first molecular sieve water separation tower, it is described
The arrival end of first filter and the gaseous phase outlet end of pre-dehydration gas-liquid separator carry out pipeline connection, the first filter
Outlet end carries out pipeline connection by the top port of the first intake valve and the first molecular sieve water separation tower.
Preferably, defeated pipe is equipped with the second filter outside the natural gas.
Preferably, the hot fluid circulation module includes heat-conducting oil furnace, the conduction oil outlet end of the heat-conducting oil furnace and heating
The hot inlet end of heat exchanger carries out pipeline connection, and the conduction oil reflux end of the heat-conducting oil furnace and the hot-fluid of heating heat exchanger go out
Mouth end carries out pipeline connection.
Preferably, the molecular sieve dehydration module further includes regeneration replacement module, and the regeneration replacement module includes second
Molecular sieve water separation tower, the top port of second molecular sieve water separation tower pass through the outlet end of the second intake valve and first filter
Pipeline connection is carried out, the bottom port of second molecular sieve water separation tower passes through the arrival end of second row air valve and the second filter
Carry out pipeline connection；
The gaseous phase outlet end of the heating heat exchanger passes through the bottom of the second regenerative intake valve and the second molecular sieve water separation tower
Port carries out pipeline connection, and the top port of second molecular sieve water separation tower is entered by the second regeneration air outlet valve and air cooler
Mouth end carries out pipeline connection.
Preferably, the bottom of first molecular sieve water separation tower is equipped with skid, the precool heat exchanger device, pre-dehydration gas-liquid point
From device, first filter, the second molecular sieve water separation tower, booster compressor, heating heat exchanger, heat-conducting oil furnace, air cooler, the second mistake
Filter is arranged in skid.
The utility model has the following beneficial effects:
(1) the utility model installs pre-dehydration mould additional with the Gas Dehydration System of pre-dehydration module before molecular sieve dehydration
Block, natural gas are exchanged heat by precool heat exchanger device and the water after cooling in refrigerant cycle module, are on the one hand reduced natural
Gas enters the inlet temperature of molecular sieve water separation tower, improves the dehydrating effect of molecular sieve, guarantees the normal operation of backend process, another
Cooling effect of the aspect precool heat exchanger device to natural gas makes the vapor contained in natural gas pre-cooling condense into liquid water, then
It is come out by pre-dehydration gas-liquid separator separates, plays the purpose of pre-dehydration, can reduce subsequent molecular sieve adsorbing and dewatering
Burden, to keep the dehydrating effect of entire dewatering system more preferable.
(2) the utility model has in the Gas Dehydration System of pre-dehydration module to carry out gas in natural gas line and be used for
The regenerated regeneration gas of molecular sieve water separation tower passes through pre-cooling gas-liquid separator and carries out pre-dehydration, i.e., by gas-liquid needed for regeneration gas point
A separator is merged into from the pre-dehydration gas-liquid separator in device and pre-dehydration module, can achieve the case where technique requires
One separator of lower reduction, reduces equipment cost.
Detailed description of the invention
Fig. 1 is the process flow chart of Gas Dehydration System of the utility model with pre-dehydration module；
Wherein
1- precool heat exchanger device, 101- refrigerant compressor, 102- cold water storage cistern, 103- throttle valve, 104- refrigerant cycle pipeline；
2- pre-dehydration gas-liquid separator, 21- liquid phase dump valve, 22- sewage-treatment plant, 3- first filter；
The first molecular sieve water separation tower of 4-, the first intake valve of 41-, 42- first row air valve, the first regenerative intake valve of 43-, 44-
First regeneration air outlet valve；
The second molecular sieve water separation tower of 5-, the second intake valve of 51-, 52- second row air valve, the second regenerative intake valve of 53-, 54-
Second regeneration air outlet valve；
6- booster compressor, 61- regenerating valve, 7- heating heat exchanger, 8- heat-conducting oil furnace, 9- air cooler, 10- second are filtered
Device, defeated pipe outside 11- natural gas, 12- natural gas line.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of Gas Dehydration System with pre-dehydration module, including pre-dehydration module, molecular sieve are de-
Water module, regenerating molecular sieve module；
The pre-dehydration module includes precool heat exchanger device 1, pre-dehydration gas-liquid separator 2, the gas phase of the precool heat exchanger device 1
Input end is attached with natural gas line, the gaseous phase outlet end of the precool heat exchanger device 1 and pre-dehydration gas-liquid separator 2 into
Mouth end carries out pipeline connection, and the cryogen arrival end of the precool heat exchanger device 1 and cryogen outlet end are carried out with refrigerant cycle module
Pipeline connection；On the one hand pre-dehydration module passes through precool heat exchanger device 1 reduces the inlet temperature that natural gas enters molecular sieve water separation tower,
The dehydrating effect for improving molecular sieve makes the vapor contained in natural gas on the other hand by carrying out cooling processing to natural gas
Liquid water is condensed into, and is sloughed by pre-dehydration gas-liquid separator 2, to play the purpose of pre-dehydration；
The molecular sieve dehydration module includes the first molecular sieve water separation tower 4, the top end of first molecular sieve water separation tower 4
Mouth carries out pipeline connection, first molecular sieve by the gaseous phase outlet end of the first intake valve 41 and pre-dehydration gas-liquid separator 2
The bottom port of dehydrating tower 4 is attached by first row air valve 42 with pipe 11 defeated outside natural gas；
The regenerating molecular sieve module includes booster compressor 6, heating heat exchanger 7, the arrival end of the booster compressor 6
Pipeline connection is carried out by defeated pipe 11 outside regenerating valve 61 and natural gas, the outlet end of the booster compressor 6 and heating exchange heat
The gas phase input end of device 7 carries out pipeline connection, the gaseous phase outlet end of the heating heat exchanger 7 by the first regenerative intake valve 43 with
The bottom port of first molecular sieve water separation tower 4 carries out pipeline connection, and the top port of first molecular sieve water separation tower 4 passes through the
One regenerates the arrival end progress pipeline connection of air valve 44 and air cooler 9, the outlet end of the air cooler 9 and precool heat exchanger device 1
Gas phase input end carry out pipeline connection；The hot inlet end and hot outlets end of the heating heat exchanger 7 are and hot fluid circulation
Module carries out pipeline connection.
Preferably, the liquid-phase outlet end of the pre-dehydration gas-liquid separator 2 is filled by liquid phase dump valve 21 and sewage treatment
It sets and carries out pipeline connection.
Preferably, the refrigerant cycle module includes refrigerant compressor 101, cold water storage cistern 102, throttle valve 103；The cryogen
The entrance of compressor 101 and the cryogen outlet end of precool heat exchanger device 1 carry out pipeline connection, the outlet of the refrigerant compressor 101
Be connected to the cryogen arrival end of precool heat exchanger device 1 by refrigerant cycle pipeline 104,101 outlet end of refrigerant compressor it is cold
Agent circulating line 104 passes through cold water storage cistern 102 and carries out water-cooled cooling, and the refrigerant cycle pipeline 104 is equipped with throttle valve 103, with
Just throttling cooling is carried out to cryogen；Wherein cryogen is that methane, ethylene, butane and iso-butane are matched by a certain proportion of
's.
Preferably, first filter 3, institute are equipped between the pre-dehydration gas-liquid separator 2 and the first molecular sieve water separation tower 4
The gaseous phase outlet end of the arrival end and pre-dehydration gas-liquid separator 2 of stating first filter 3 carries out pipeline connection, first filtering
The outlet end of device 3 carries out pipeline connection by the top port of the first intake valve 41 and the first molecular sieve water separation tower 4.
Preferably, defeated pipe 11 is equipped with the second filter 10 outside the natural gas.
Preferably, the hot fluid circulation module includes heat-conducting oil furnace 8, the conduction oil outlet end of the heat-conducting oil furnace 8 with plus
The hot inlet end of heat exchanger 7 carries out pipeline connection, conduction oil reflux end and the heating heat exchanger 7 of the heat-conducting oil furnace 8
Hot outlets end carries out pipeline connection；Thermally conductive hot oil in heat-conducting oil furnace 8 is delivered to heating heat exchanger through internal high temperature oil pump
In exchange heat with dewatered purified natural gas, thermally conductive hot oil temperature after heat exchange reduces, and is back in heat-conducting oil furnace 8
It is heated, forms a complete hot fluid circulation process.
Preferably, the molecular sieve dehydration module further includes regeneration replacement module, and the regeneration replacement module includes second
The top port of molecular sieve water separation tower 5, second molecular sieve water separation tower 5 passes through the second intake valve 51 and first filter 3
Outlet end carries out pipeline connection, and the bottom port of second molecular sieve water separation tower 5 passes through second row air valve 52 and the second filtering
The arrival end of device 10 carries out pipeline connection；
The gaseous phase outlet end of the heating heat exchanger 7 passes through the second regenerative intake valve 53 and the second molecular sieve water separation tower 5
Bottom port carries out pipeline connection, and the top port of second molecular sieve water separation tower 5 passes through the second regeneration air outlet valve 54 and sky
The arrival end of cooler 9 carries out pipeline connection.
Preferably, the bottom of first molecular sieve water separation tower 4 is equipped with skid, the precool heat exchanger device 1, pre-dehydration gas-liquid
It is separator 2, first filter 3, the second molecular sieve water separation tower 5, booster compressor 6, heating heat exchanger 7, heat-conducting oil furnace 8, air-cooled
Device 9, the second filter 10 are arranged in skid.
A kind of Gas Dehydration System with pre-dehydration module, specific embodiment are as follows:
The Gas Dehydration System of the application includes molecular sieve dehydration module, regenerating molecular sieve module, regenerates replacement module,
Connection relationship between them makes whole system can be realized tower dehydration one tower regeneration, guarantees the continuous of natural gas dehydration process
It carries out, specific as follows:
It being dehydrated with the first molecular sieve water separation tower 4, the second molecular sieve water separation tower 5 is illustrated for being regenerated, this
When the first intake valve 41, first row air valve 42 open, the first regenerative intake valve 43, first regenerate air outlet valve 44 close, with realize
The dewatering process flow of first molecular sieve water separation tower 4；Second intake valve 51, second row air valve 52 are closed, the second regenerative intake valve 53, the
Two regeneration air outlet valves 54 are opened, to realize the regeneration process of the second molecular sieve water separation tower 5.
Natural gas in natural gas line 12 enters in precool heat exchanger device 1 to be changed with the cooling water in refrigerant cycle module
Heat has reached the purpose of cooling, and then the natural gas after cooling enters in pre-dehydration gas-liquid separator 2, will contain in natural gas
Liquid water abjection, the liquid water of abjection passes through pipe through the liquid-phase outlet of 2 bottom of pre-dehydration gas-liquid separator, liquid phase dump valve 21
Road is delivered to sewage-treatment plant 22 and is handled；Natural gas after pre-dehydration goes out through the gas phase of pre-dehydration gas-liquid separator 2
Mouth flows through first filter 3 and removes corresponding liquid, solid phase impurity, enters the first molecule by the first intake valve 41 opened later
Sieve dehydrating tower 4, bottom port by the dewatered natural gas of the first molecular sieve water separation tower 4 through the first molecular sieve water separation tower 4 into
Enter the removal of impurities of the second filter 10 becomes purified natural gas later, carries out by pipe 11 defeated outside natural gas outer defeated；
Meanwhile the Partial cleansing natural gas outside natural gas in defeated pipe 11 is delivered to heating heat exchanger 7 by booster compressor 6
It is interior with heat-conducting oil furnace 8 in conduction oil carry out heat exchange heating, the purified natural gas after heating by the second molecular sieve water separation tower 5 bottom
Portion port enters the second molecular sieve water separation tower 5, removes adsorbent water, to restore the activity of adsorbent, and becomes moist
Regeneration gas, after the top port through the second molecular sieve water separation tower 5 pass through air cooler 9 cooling effect, then through piping
It is delivered to precool heat exchanger device 1, enters pre-dehydration module progress pre-dehydration jointly with the gas that comes in natural gas line 12.
General process flow, the moist regeneration gas come out from the top port of the second molecular sieve water separation tower 5 mostly need
Gas separating device is regenerated to be dehydrated, and the separator in the application by pre-dehydration gas-liquid separator 2 as moist regeneration gas, i.e.,
Pre-dehydration gas-liquid separator in gas-liquid separator needed for regeneration gas and pre-dehydration module is merged into a separator, can
It reduces by a separator to reach in the case that technique requires, reduces equipment cost.
Similarly, when the first molecular sieve water separation tower 4 carries out regeneration process, and the second molecular sieve water separation tower 5 carries out dewatering process flow,
As long as changing the switch state of respective valve: the first intake valve 41, first row air valve 42 are closed, the first regenerative intake valve 43,
First regeneration air outlet valve 44 is opened, to realize the regeneration process of the first molecular sieve water separation tower 4；Second intake valve 51, second exhaust
Valve 52 is opened, and the second regenerative intake valve 53, second regenerates air outlet valve 54 and closes, to realize the dehydration of the second molecular sieve water separation tower 5
Process.
In the description of the present invention, it should be understood that the orientation or position of the instructions such as term " top ", " bottom "
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be construed as a limitation of the present invention.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but it is not practical new to this
The limitation of type, those skilled in the art should understand that, based on the technical solution of the present invention, those skilled in the art
Member, which does not need to make the creative labor the various modifications or changes that can be made, to be still within the scope of the present invention.
Claims (8)
1. a kind of Gas Dehydration System with pre-dehydration module, characterized in that including pre-dehydration module, molecular sieve dehydration mould
Block, regenerating molecular sieve module；
The pre-dehydration module includes precool heat exchanger device, pre-dehydration gas-liquid separator, the gas phase input end of the precool heat exchanger device
It is attached with natural gas line, the gaseous phase outlet end of the precool heat exchanger device and the input end of pre-dehydration gas-liquid separator carry out
Pipeline connection, the cryogen arrival end of the precool heat exchanger device and cryogen outlet end carry out pipeline connection with refrigerant cycle module；
The molecular sieve dehydration module includes the first molecular sieve water separation tower, and the top port of first molecular sieve water separation tower passes through
The gaseous phase outlet end of first intake valve and pre-dehydration gas-liquid separator carries out pipeline connection, the bottom of first molecular sieve water separation tower
Portion port is attached by first row air valve and pipe defeated outside natural gas；
The regenerating molecular sieve module includes booster compressor, heating heat exchanger, and the arrival end of the booster compressor is by again
Defeated pipe carries out pipeline connection, the outlet end of the booster compressor and the gas phase import of heating heat exchanger outside raw valve and natural gas
End carries out pipeline connection, and the gaseous phase outlet end of the heating heat exchanger passes through the first regenerative intake valve and the first molecular sieve water separation tower
Bottom port carry out pipeline connection, the top port of first molecular sieve water separation tower by the first regeneration air outlet valve with it is air-cooled
The arrival end of device carries out pipeline connection, and the outlet end of the air cooler and the gas phase input end of precool heat exchanger device carry out pipeline company
It connects；The hot inlet end and hot outlets end of the heating heat exchanger carry out pipeline connection with hot fluid circulation module.
2. a kind of Gas Dehydration System with pre-dehydration module as described in claim 1, characterized in that the pre-dehydration
The liquid-phase outlet end of gas-liquid separator carries out pipeline connection by liquid phase dump valve and sewage-treatment plant.
3. a kind of Gas Dehydration System with pre-dehydration module as described in claim 1, characterized in that the cryogen follows
Ring moulds block includes refrigerant compressor, cold water storage cistern, throttle valve；The entrance of the refrigerant compressor and the cryogen of precool heat exchanger device export
End carries out pipeline connection, and the outlet of the refrigerant compressor is connected to the cryogen entrance of precool heat exchanger device by refrigerant cycle pipeline
End, the refrigerant cycle pipeline of the refrigerant compressor outlet end pass through cold water storage cistern and carry out water-cooled cooling, the refrigerant cycle pipeline
It is equipped with throttle valve.
4. a kind of Gas Dehydration System with pre-dehydration module as described in claim 1, characterized in that the pre-dehydration
First filter, the arrival end and pre-dehydration of the first filter are equipped between gas-liquid separator and the first molecular sieve water separation tower
The gaseous phase outlet end of gas-liquid separator carries out pipeline connection, and the outlet end of the first filter passes through the first intake valve and first
The top port of molecular sieve water separation tower carries out pipeline connection.
5. a kind of Gas Dehydration System with pre-dehydration module as claimed in claim 4, characterized in that the natural gas
Outer defeated pipe is equipped with the second filter.
6. a kind of Gas Dehydration System with pre-dehydration module as described in claim 1, characterized in that the hot-fluid follows
Ring moulds block includes heat-conducting oil furnace, and the conduction oil outlet end of the heat-conducting oil furnace and the hot inlet end of heating heat exchanger carry out pipeline
Connection, the conduction oil reflux end of the heat-conducting oil furnace and the hot outlets end of heating heat exchanger carry out pipeline connection.
7. a kind of Gas Dehydration System with pre-dehydration module as claimed in claim 5, characterized in that the molecular sieve
Dewatering module further includes regeneration replacement module, and the regeneration replacement module includes the second molecular sieve water separation tower, second molecule
The top port for sieving dehydrating tower carries out pipeline connection, second molecule by the outlet end of the second intake valve and first filter
The bottom port for sieving dehydrating tower carries out pipeline connection by the arrival end of second row air valve and the second filter；
The gaseous phase outlet end of the heating heat exchanger passes through the bottom port of the second regenerative intake valve and the second molecular sieve water separation tower
Carry out pipeline connection, the arrival end that the top port of second molecular sieve water separation tower passes through the second regeneration air outlet valve and air cooler
Carry out pipeline connection.
8. a kind of Gas Dehydration System with pre-dehydration module as claimed in claim 7, characterized in that described first point
The bottom of son sieve dehydrating tower is equipped with skid, the precool heat exchanger device, pre-dehydration gas-liquid separator, first filter, the second molecule
Sieve dehydrating tower, booster compressor, heating heat exchanger, heat-conducting oil furnace, air cooler, the second filter are arranged in skid.
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| CN201821340701.XU CN208898830U (en) | 2018-08-20 | 2018-08-20 | A kind of Gas Dehydration System with pre-dehydration module |
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| CN201821340701.XU CN208898830U (en) | 2018-08-20 | 2018-08-20 | A kind of Gas Dehydration System with pre-dehydration module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110317650A (en) * | 2019-07-26 | 2019-10-11 | 合肥哈工新能源科技有限公司 | A kind of vehicular well head gas recovery system |
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2018
- 2018-08-20 CN CN201821340701.XU patent/CN208898830U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110317650A (en) * | 2019-07-26 | 2019-10-11 | 合肥哈工新能源科技有限公司 | A kind of vehicular well head gas recovery system |
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