CN206037747U - A engine auxiliary assembly for natural gas extraction technology - Google Patents
A engine auxiliary assembly for natural gas extraction technology Download PDFInfo
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- CN206037747U CN206037747U CN201620872731.XU CN201620872731U CN206037747U CN 206037747 U CN206037747 U CN 206037747U CN 201620872731 U CN201620872731 U CN 201620872731U CN 206037747 U CN206037747 U CN 206037747U
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Abstract
The utility model discloses an engine auxiliary assembly for natural gas extraction technology, the plastic width -lock type single -layer sealed packing case comprises a casin, feed liquor pipe and drain pipe, the inside bending of box is provided with the heat exchange tube, set up a plurality of spoilers on the heat exchange tube, equidistantly on the inner wall of box be fixed with a plurality of division boards, set up the through -hole on the division board, the heat exchange tube passes the through -hole, be provided with the sealing washer between heat exchange tube and the through -hole, the division board is regional with the air cooling that the inner space of box divide into a plurality of intercommunications, be provided with the air inlet respectively on the side in first air cooling region and final air cooling region, be provided with the gas outlet on the box. The utility model discloses an air runner in the rational design box to utilize two air inlets to admit air simultaneously, not only practiced thrift the coolant liquid resource, reduced exploitation cost, still avoided traditional air cooler high temperature air to appear in the second half section of flow and carried out the condition about heating to cryogenic liquid, improved heat exchange efficiency effectively.
Description
Technical field
The utility model is related to a kind of firing equipment, and in particular to a kind of engine for natural gas extraction technique is aided in
Equipment.
Background technology
With the fast development of science and technology, people have gradually recognized the use of natural gas, and extensively apply in every field,
So that natural gas is used as the energy indispensable in people's daily life.The increase of demand brings frequently exploits, but natural gas
Belong to non-renewable resources, with going deep into for exploitation, part gas well enters low pressure mining phase as natural gas total amount die-offs.
In order to still produce natural gas in low pressure mining phase, the driving equipment to gas well collection, the i.e. power consumption requirements of engine
Then well beyond normal power consumption number, so as to cause the spindle portion of engine to produce substantial amounts of heat after work certain hour
Can, in order to ensure engine can normal work, then need the rotating shaft to engine to carry out continued down.
Cooling medium for engine of lowering the temperature is raised in cooled rear temperature, is situated between to reuse this part cooling
Matter, is cooled down and is recycled in being generally passed into cooler.Traditional cooler mainly by the way of water-cooled, but,
As water-cooled needs to consume a large amount of cooling waters, substantial amounts of cooling water can be consumed in lasting gas well exploitation, it is such to open
Mode high cost is adopted, it is uneconomical；Although existing air cooler can solve the problem that Cost Problems, but its air flow channel be set in it is cold
But, on the outside of the runner of medium, runner of the air from cooling medium is flow through on the outside of heat exchanger tube, carries out heat exchange, this mode
Existing problems, i.e., in porch, air is low temperature, and the cooling medium of engine is high temperature, when exporting along runner flow direction, is occurred
Heat exchange, air themperature are raised, and coolant temperature is gradually lowered, after air stream enter runner the second half is entered, the high temperature meeting again of air
Cooling medium is heated, causes the temperature of cooling medium to increase, cooling-down effect is poor by this way for institute.
Utility model content
Technical problem to be solved in the utility model is the defect for conventional air cooling device, it is therefore intended that provided
A kind of engine powered auxiliary equipment for natural gas extraction technique, solves traditional air-cooling apparatus due to coolant flow channel structure
And the problem of the cooling effect difference for producing.
The utility model is achieved through the following technical solutions：A kind of engine auxiliary for natural gas extraction technique sets
It is standby, including casing, feed tube and drain pipe on the same side of the casing, is provided with, box house bending is provided with heat exchange
Pipe, the two ends of the heat exchanger tube connect feed tube, drain pipe respectively, are fixed with some demarcation strips on the inwall of casing, described point
Some through holes are provided with dividing plate, and heat exchanger tube passes through the through hole, is provided with sealing ring between heat exchanger tube and through hole, and demarcation strip is equal
Parallel to the body side that feed tube is located, the inner space of casing is divided into demarcation strip the air cooling region of some connections, and edge is entered
The direction of liquid pipe place side to the another side parallel with the side, in first air cooling region and last air cooling zone
Air inlet is respectively arranged with the side in domain, and the air inlet is located on casing, is additionally provided with gas outlet, the outlet on casing
Mouth is located between two air inlets, is additionally provided with some flow-disturbings on the side wall in first air cooling region and last air cooling region
Plate.
Traditional cooler is broadly divided into water cooler or air cooler.Although the effect of water cooler is better than air cooler,
It is in the recovery process of low-pressure gas well, very high to the power consumption requirements of engine, to make engine maintain normal operating temperature,
Quick circulating cooling medium is wanted then, if water cooler will be adopted in this case, then substantial amounts of coolant will be consumed, due to
Low-pressure gas well is exploited obtained income and is originally lower than normal barometric pressure or high pressured production, is situated between according to water cooler cooling cooling
Matter, not only increases cost, also wastes the energy.Air cooler is cooling medium to be lowered the temperature by air, and its advantage is that air is obtained
Take it is very convenient, can be to input air in casing by air blast, and air is inexhaustible, does not result in the wave of the energy
Take, so in the exploitation of low-pressure gas well, being very cost-effective from air cooler.But, the runner of existing air cooler
Setting is problematic, because its air flow channel is set on the outside of the runner of cooling medium, stream of the air from cooling medium
Flowing through on the outside of road, i.e. heat exchanger tube, heat exchange being carried out with the cooling medium in heat exchanger tube, the problem of this mode is in tank inlet
Place, air is low temperature, and the cooling medium of engine is high temperature, when exporting along runner flow direction, heat exchange occurs, air themperature by
While edging up high, coolant temperature is gradually lowered, and after air stream enter runner the second half is entered, the high temperature of air again can be to cooling medium
Heated, cause the temperature of cooling medium to increase, by this way cooling-down effect be very poor.
In order to solve the above problems, rationally the cooling medium for cooling down engine is cooled down using air, this practicality is new
Type provides a kind of air cooling device.Identical with traditional air cooler, this device also includes casing, and is arranged on entering on casing
In liquid pipe and drain pipe, casing, also bending is provided with heat exchanger tube, and circulate in heat exchanger tube engine cooling medium, the two ends of heat exchanger tube
Connect feed tube and drain pipe respectively.From unlike existing air cooler, some being parallel to each other is fixed with the inwall of casing
Demarcation strip, the body side that the demarcation strip is located parallel to feed tube, the top surface of demarcation strip, bottom surface and a side and case
Body connects, and its excess-three face forms the air flow channel of bending with casing, and air flow channel is intercepted into some air coolings by some demarcation strips
Region, by the gap area between demarcation strip and cabinet wall between two adjacent air cooling regions, meanwhile, on demarcation strip
Some through holes are provided with, heat exchanger tube passes through the through hole, through hole to cause demarcation strip to also act the work for supporting and guiding heat exchanger tube
With, sealing ring is additionally provided with the inside of through hole and the outside of heat exchanger tube between, sealing ring is prevented from air and flows through from through hole.Edge
Direction of the side that feed tube is located to the another side parallel with the side, in first air cooling region and last sky
Air inlet is respectively arranged with the side in cold-zone domain, air inlet is arranged on casing, i.e., this device is provided with two air inlets, case
Gas outlet is additionally provided with body, and gas outlet is located between two air inlets.By said structure, the cooling of the engine of high temperature is situated between
Matter is entered to by feed tube in the heat exchanger tube in casing, and temperature is discharged after reducing from drain pipe；Air is from two air inlets
In be simultaneously passed through to casing, air flows to gas outlet along demarcation strip.In casing, air and heat exchanger tube contact outside lead to
The cooling medium heat-shift of heat exchanger tube and high temperature is crossed, the purpose of cooling engine cooling medium is reached.In the design of this device
In, the first air cooling region and last air cooling region are minimum due to connecting air inlet, air themperature therein, and heat exchanger tube
Feed tube and drain pipe are located in the first air cooling region, and such Cryogenic air just to having just enter in casing and be able to will be expelled to
Engine cooling medium outside casing carries out heat exchange, it is to avoid traditional air cooler can also be right in the second half air of heat exchanger tube
The situation heated by cooling medium, effectively improves cooling effect.Simultaneously as feed tube and discharging tube are arranged on casing
Same side on, so bending heat exchanger tube be necessarily have at least near the parallel another side in feed tube place side
One knee, even and if the knee is not fallen within last air cooling region, the air cooling region for yet falling in its vicinity, and
The Cryogenic air being passed through in last air cooling region can effectively to the engine cooling medium in the heat exchanger tube in knee
Lowered the temperature.Due to being provided with gas outlet between two air inlets, so the flow process of air also relatively shortens half, temperature before
Elevated air is discharged eventually through gas outlet.
In sum, this device passes through the air flow channel in appropriate design casing, and using the air inlet simultaneously of two air inlets,
The coolant of cooler is not only saved, cost of winning has been reduced, it is thus also avoided that Traditional Air Cooled Exchanger occurred in the second half section of flow process
The situation heated to low-temperature cooling media by high temperature air, is effectively improved heat exchange efficiency.
Moreover, also find in actual applications, gap of the air between through hole and heat exchanger tube sometimes occurs
In flow through, cause lower the temperature efficiency decline defect.Firstly, because the design of air flow channel is so that from air inlet place in casing
The air cooling region that air cooling region to gas outlet is located, what temperature gradually rose, behind so fixed air cooling region, just can be according to sky
The temperature change in cold-zone domain arranges the position of heat exchanger tube, preferably should wherein arrange the knee of heat exchanger tube from global assurance
At straight tube, good heat exchange effect is reached, but, after air is flow through from through hole, the temperature change of air is no longer
Rule, the temperature difference between each air cooling region reduces, and the air themperature in casing everywhere is more or less the same, the cooling exchanged in heat pipe
The cooling effect of medium is namely the same everywhere, so the cooling effect in the air cooling region of part is reduced, causes whole dress
The cooling effect put is deteriorated.Secondly because gap is very narrow, air speed when by gap improves rapidly several times, flows through at a high speed
Air with heat exchange pipe surface friction cause heat exchanger tube surface be heated, reduce cooling-down effect.In order to solve above-mentioned asking
Topic, be provided with sealing ring between through hole and heat exchanger tube, gap is blocked by the sealing ring so that air can only from demarcation strip with
Space between casing passes through, and is effectively guaranteed the regularity of thermograde change between air cooling region, further improves
The cooling effect of device, in addition, sealing ring is also avoid at a high speed by the noise produced by air, improves working environment.
The direction of the side to the another side parallel with the side being located along feed tube, first air cooling region and most
The side that some spoilers, i.e. spoiler can both be arranged on demarcation strip is provided with the inwall in latter air cooling region,
Can be arranged on the inwall of casing.First air cooling region and last air cooling region are connected with air inlet, so temperature
It is minimum in all air cooling regions, as air and heat exchanger tube carry out heat exchange, the temperature of air gradually rises, and downwards
The flowing of one air cooling region, so in order to extend the time of staying of the Cryogenic air in the two regions, make air fully with heat exchange
Pipe contact, spoiler is set in the two regions, spoiler can change the direction of air flow, make air will not quickly from
Flow away in first air cooling region and last air cooling region.Meanwhile, spoiler can also change the type of flow of air, not have
When having increase spoiler, although flow direction can be changed in demarcation strip air of locating vertical with cabinet wall, but when most of
Wait, the motion mode of air is laminar flow, and only some air contacted with heat exchanger tube can be exchanged heat the air of laminar flow, its
The remaining air for being not exposed to heat exchanger tube is then directly entered next air cooling region, and passes between the air of laminar flow its inner air
Thermal velocity is slow, it may appear that the laminar-flow air temperature locally near heat exchanger tube is high, away from the low feelings of the laminar-flow air temperature of heat exchanger tube
Condition.After being provided with spoiler, flowing multilated of the air in first and last air cooling region is partially formed rapids
Stream, accelerates the heat exchange of inside air, makes the air bulk temperature in region average, be not in the feelings of hot-spot
Condition, drastically increases the cooling effect of device.
Further, fin is provided with heat exchanger tube, and the fin extends from one end of heat exchanger tube along the axis of heat exchanger tube
To the other end.The purpose for arranging fin is essentially identical with the purpose of spoiler, but fin tends to change air flow shape
State rather than flow direction, fin cause the air floating manner contacted with heat exchanger tube to be changed into turbulent flow from laminar flow, accelerate in air
The heat transfer in portion, even if making also receive partial heat away from the air of heat exchanger tube, so as to send out in the reduction heat exchanger tube beaten
The purpose of motivation coolant temperature.In addition, fin can also increase the contact area of heat exchanger tube and air, that is, increase and start
Machine cooling medium and the heat exchange area of air, can further lift cooling-down effect.
Further, fin has 4, and the angle between adjacent fin is 90 °.Find through practical application, fin number
Measure as 4 and when the angle between adjacent fins is right angle, the cooling-down effect of device is optimal.
Further, the heat exchanger tube and fin are made by brass.Brass is the alloy of copper and zinc, not only with hardness
High, sludge proof feature, and heat transfer coefficient is very high, it can be ensured that and air carries out sufficient heat friendship with engine cooling medium
Change.
Further, along near feed tube side to the direction away from feed tube side, the volume in air cooling region is first gradually
After reduction gradually increase, and the volume in first air cooling region and last air cooling region is maximum.Due to first air cooling zone
In domain and last air cooling region, air enters casing in air inlet just now, and air themperature is minimum, by the body in the two regions
Product arranges maximum, can reduce air by speed, increase the time of staying of the air in the two air cooling regions so that empty
Gas fully carries out heat exchange with the heat exchanger tube in region；With drawing close in the middle part of casing, the volume in air cooling region is gradually reduced,
Improve air by speed so that the elevated air of temperature quickly can be discharged from gas outlet, the reduction elevated sky of temperature
Heat exchange between gas and heat exchanger tube.
Further, the volume in the maximum air cooling region of the volume is the 2 to 4 of the volume in the minimum air cooling region of volume
Times.Found by putting into practice, when the volume ratio between air cooling region maximum and minimum in casing is 2 to 4, can reach compared with
Good cooling-down effect.
Further, the knee of heat exchanger tube is located at last air cooling region or first and last air cooling
Region.If air cooling region Nei You knees, then due to liquid it is longer in knee residence time, if the air cooling region
Air themperature it is low, then the cooling in engine cooling medium would be more advantageous.When heat exchanger tube only one of which knee, i.e.,
Heat exchanger tube takes the shape of the letter U in casing pipe, and knee is arranged on last air cooling region now, and last air cooling region is arranged
There is air inlet, air themperature is minimum in the region, the cooling medium cooling that effectively can be exchanged in heat pipe；If heat exchanger tube has
Plural knee, then all knees are all disposed within into first air cooling region or last air cooling region,
Remainder is all straight tube, and well the engine cooling medium in knee can not only be lowered the temperature, meanwhile, remaining air cooling
Heat exchanger tube in region be straight tube, cooling medium can be made to quickly move through this cooled region because remove first or last
Individual air cooling region, the air themperature in remaining air cooling region are all of a relatively high, it is possible to avoiding cooling medium from being heated.
The utility model compared with prior art, has the following advantages and advantages：
1st, the utility model passes through the air flow channel in appropriate design casing, and utilizes the air inlet simultaneously of two air inlets, no
Coolant resource is only saved, cost of winning has been reduced, it is thus also avoided that it is empty that Traditional Air Cooled Exchanger high temperature has occurred in the second half section of flow process
The situation heated to cryogenic liquid by gas, is effectively improved heat exchange efficiency；
2nd, the utility model arranges some spoilers on the side wall in first air cooling region and last air cooling region,
Spoiler can change the direction of air flow, make the air will not quickly from first air cooling region and last air cooling region
In flow away, meanwhile, spoiler can also change the type of flow of air so that air formed turbulent flow, accelerate the heat of inside air
Amount is exchanged, and is made the air bulk temperature in region average, is not in the situation of hot-spot, drastically increases device
Cooling effect；
3rd, the utility model is provided with sealing ring between through hole and heat exchanger tube, and gap is blocked by the sealing ring so that
Air can only be between demarcation strip and casing space pass through, be effectively guaranteed the rule of the change of thermograde between air cooling region
Rule property, further improves the cooling effect of device, in addition, sealing ring is also avoid at a high speed by the noise produced by air,
Improve working environment；
4th, this using new edge near feed tube side to the direction away from feed tube side, the volume in air cooling region first by
After decrescence little gradually increase, and the volume in first air cooling region and last air cooling region is maximum, can reduce by first
With in last air cooling region air by speed, increase the time of staying of the air in the two air cooling regions so that
Air fully carries out heat exchange with the heat exchanger tube in region；With drawing close in the middle part of casing, the volume in air cooling region gradually subtracts
It is little, improve air by speed so that the elevated air of temperature can quickly from gas outlet discharge, reduction temperature it is elevated
Heat exchange between air and heat exchanger tube.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding the utility model embodiment, constitutes the one of the application
Part, does not constitute the restriction to the utility model embodiment.In the accompanying drawings：
Fig. 1 is the utility model structural representation；
Partial structural diagrams of the Fig. 2 for demarcation strip；
The sectional view of Fig. 3 positions heat exchanger tube；
Mark and corresponding parts title in accompanying drawing：
1- casings, 2- feed tubes, 3- drain pipes, 4- air inlets, 5- gas outlets, 6- demarcation strips, 7- heat exchanger tubes, 8- sealings
Circle, 9- spoilers, 10- fins.
Specific embodiment
For making the purpose of this utility model, technical scheme and advantage become more apparent, with reference to embodiment and accompanying drawing,
The utility model is described in further detail, and exemplary embodiment of the present utility model and its explanation are only used for explaining this
Utility model, is not intended as to restriction of the present utility model.
Embodiment
As shown in Figure 1, Figure 2 and Figure 3, the utility model is that a kind of engine auxiliary for natural gas extraction technique sets
It is standby, including casing 1, feed tube 2 and drain pipe 3 on the same side of casing 1, is provided with, bending inside casing 1 is provided with and changes
Heat pipe 7, the two ends of heat exchanger tube 7 connect feed tube 2, drain pipe 3 respectively, are fixed with some demarcation strips 6 on the inwall of casing 1, point
Some through holes are provided with dividing plate 6, and heat exchanger tube 7 passes through through hole, is provided with sealing ring 8, demarcation strip 6 between heat exchanger tube 7 and through hole
Each parallel to 1 side of casing that feed tube 2 is located, the inner space of casing 1 is divided into demarcation strip 6 air cooling zone of some connections
Domain, along 2 place side of feed tube to the another side parallel with the side direction, first air cooling region and last
Air inlet 4 is respectively arranged with the side in individual air cooling region, and air inlet 4 is located on casing 1, is additionally provided with gas outlet on casing 1
5, institute gas outlet 5 is located between two air inlets 4, is also set up on the side wall in first air cooling region and last air cooling region
There are some spoilers 9.Fin 10 is provided with heat exchanger tube 7, and fin 10 extends from one end of heat exchanger tube 7 along the axis of heat exchanger tube 7
To the other end.Fin 10 has 4, and the angle between adjacent fin 10 is 90 °.Heat exchanger tube 7 and fin 10 are made by brass.
Along near 2 side of feed tube to away from 2 side of feed tube direction, the volume in air cooling region be first gradually reduced after gradually increase,
And the volume in first air cooling region and last air cooling region is maximum.The volume in the maximum air cooling region of volume be volume most
2 to 4 times of the volume in little air cooling region.The knee of heat exchanger tube 7 is located at last air cooling region or first and most
Latter air cooling region.
During using this device, first air is passed through into casing 1 from two air inlets 4 simultaneously so that air is in case
Circulate in the air cooling region formed with demarcation strip 6 inside body 1.Then pass through feed tube 2 by engine cooling medium be passed through to
In heat exchanger tube 7.The engine cooling medium of high temperature carries out heat exchange with the air of low temperature by the tube wall of heat exchanger tube 7, reaches
Reduce the purpose of coolant temperature.Engine cooling medium after cooling is finally discharged from discharging tube 3, and the elevated sky of temperature
Gas is then discharged from gas outlet 5.
The utility model is by the air flow channel in appropriate design casing 1, and utilizes two air inlets, 4 air inlet simultaneously, no
Coolant resource is only saved, cost of winning has been reduced, it is thus also avoided that it is empty that Traditional Air Cooled Exchanger high temperature has occurred in the second half section of flow process
The situation heated to cryogenic liquid by gas, is effectively improved heat exchange efficiency.
Above-described specific embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect
One step is described in detail, be should be understood that to the foregoing is only specific embodiment of the present utility model, is not used to limit
Fixed protection domain of the present utility model, all any modifications within spirit of the present utility model and principle, made, equivalent are replaced
Change, improve, should be included within protection domain of the present utility model.
Claims (5)
1. a kind of engine powered auxiliary equipment for natural gas extraction technique, including casing (1), casing (1) it is same
Bending inside feed tube (2) and drain pipe (3), casing (1) is provided with side is provided with heat exchanger tube (7), heat exchanger tube (7)
Two ends connect feed tube (2), drain pipe (3) respectively, it is characterised in that be fixed with some demarcation strips on the inwall of casing (1)
(6) some through holes, are provided with demarcation strip (6), and heat exchanger tube (7) passes through the through hole, heat exchanger tube (7) to set and through hole between
It is equipped with sealing ring (8), casing (1) side that demarcation strip (6) is located each parallel to feed tube (2), demarcation strip (6) is by casing (1)
Inner space be divided into the air cooling region of some connections, along feed tube (2) place side to the opposite side parallel with the side
The direction in face, is respectively arranged with air inlet (4) on the side in first air cooling region and last air cooling region, it is described enter
Gas port (4) is located on casing (1), is additionally provided with gas outlet (5) on casing (1), and described gas outlet (5) are located at two air inlets
(4), between, on the side wall in first air cooling region and last air cooling region, some spoilers (9) are additionally provided with；It is described to change
Fin (10) is provided with heat pipe (7), and fin (10) are extended to from one end of heat exchanger tube (7) along the axis of heat exchanger tube (7)
The other end；Fin (10) have 4, and the angle between adjacent fin (10) is 90 °.
2. a kind of engine powered auxiliary equipment for natural gas extraction technique according to claim 1, it is characterised in that institute
State heat exchanger tube (7) and fin (10) is made by brass.
3. a kind of engine powered auxiliary equipment for natural gas extraction technique according to claim 1, it is characterised in that edge
Near feed tube (2) side to the direction away from feed tube (2) side, the volume in air cooling region gradually increases after being first gradually reduced
Greatly, and first air cooling region and last air cooling region volume it is maximum.
4. a kind of engine powered auxiliary equipment for natural gas extraction technique according to claim 3, it is characterised in that institute
The volume for stating the maximum air cooling region of volume is 2 to 4 times of the volume in the minimum air cooling region of volume.
5. a kind of engine powered auxiliary equipment for natural gas extraction technique according to claim 1, it is characterised in that institute
The knee for stating heat exchanger tube (7) is located at last air cooling region or first and last air cooling region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620872731.XU CN206037747U (en) | 2016-08-12 | 2016-08-12 | A engine auxiliary assembly for natural gas extraction technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620872731.XU CN206037747U (en) | 2016-08-12 | 2016-08-12 | A engine auxiliary assembly for natural gas extraction technology |
Publications (1)
| Publication Number | Publication Date |
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| CN206037747U true CN206037747U (en) | 2017-03-22 |
Family
ID=58308926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201620872731.XU Active CN206037747U (en) | 2016-08-12 | 2016-08-12 | A engine auxiliary assembly for natural gas extraction technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123621A (en) * | 2016-08-12 | 2016-11-16 | 成都正升能源技术开发有限公司 | Engine accessory for natural gas extraction technique |
-
2016
- 2016-08-12 CN CN201620872731.XU patent/CN206037747U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123621A (en) * | 2016-08-12 | 2016-11-16 | 成都正升能源技术开发有限公司 | Engine accessory for natural gas extraction technique |
| CN106123621B (en) * | 2016-08-12 | 2019-04-23 | 成都正升能源技术开发有限公司 | Engine accessory for natural gas extraction technique |
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