CN102133785B - Carbon dioxide continuous and stable injection method and device - Google Patents
Carbon dioxide continuous and stable injection method and device Download PDFInfo
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- CN102133785B CN102133785B CN 201010582593 CN201010582593A CN102133785B CN 102133785 B CN102133785 B CN 102133785B CN 201010582593 CN201010582593 CN 201010582593 CN 201010582593 A CN201010582593 A CN 201010582593A CN 102133785 B CN102133785 B CN 102133785B
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Abstract
The invention provides a carbon dioxide continuous and stable injection method and device. Liquid-state carbon dioxide is conveyed to a pumping device from a carbon dioxide storage device and then conveyed to a processing device through a liquid conveying pipeline; the liquid conveying pipeline between the pumping device and the processing device is provided with a pressure adjusting device; the pumping device is provided with a cooling device which is communicated with the carbon dioxide storage device through the liquid conveying pipeline; the liquid-state carbon dioxide in the carbon dioxide storage device circulates between the carbon dioxide storage device and the cooling device through the liquid conveying pipeline; and the carbon dioxide in the pumping device is kept in a liquid state. The method and device have the characteristic of capability of continuously and stably injecting the carbon dioxide.
Description
Technical field
The present invention relates to a kind of macromolecule foamed plastics processing method and device, specifically, relate to a kind of carbon dioxide continous-stable method for implanting and device.
Background technology
Foamed plastics is the aggregation that gas dispersion forms in solid polymer, have light weight, heat insulation, buffering, insulation, the advantage such as anticorrosion, cheap, therefore be used widely in commodity, packing, industry, agricultural, transportation, war industry, aerospace industry.In order to obtain the foamed plastic of high foamability, usually adopt the low boiling volatile compound as blowing agent, i.e. physical blowing agent, their volatilizations produce a large amount of gases when resin is heated, and make resin expanded.Physical blowing agent commonly used has CFC, hydrochlorofluorocarsolvent, low boiling aliphatic hydrocarbon, such as butane, pentane, propane etc., also comprises in addition air, nitrogen, carbon dioxide, water etc.CFC and hydrochlorofluorocarsolvent class blowing agent are owing to damage the ozone layer, and the environmental problem that causes causes concern day by day, and therefore, the restriction of having made laws in the global range is at present used; And the low boiling fat hydrocarbon is owing to exist the safety problems such as inflammable and explosive, foaming machine, factory building, product storage and transportation etc. there is strict demand, so eco-friendly inert gas, become environment-friendly type substituted blowing agent such as carbon dioxide, nitrogen, air etc., use this class inert gas to avoid destruction to ozone layer, and nonflammable explosive, reduce processing safety, and cost is lower, has broad application prospects in the foam production field.
Carbon dioxide owing to nontoxic, tasteless, do not fire, low price, the characteristics such as be easy to get gain great popularity, and the critical-temperature of carbon dioxide (31 ℃) and critical pressure (7MPa) are easier to reach, and therefore usually are in supercriticality at plastics plasticizing processing conditions carbon dioxide.And supercritical carbon dioxide had both had density and the dielectric constant of liquid, had again the low viscosity of gas, therefore had high diffusibility and dissolubility.At present, carbon dioxide the thermoplastic high-foaming prepare aspect tool development potentiality.
As a kind of blowing agent, its content or addition not only affect apparent density, the foam structure of foaming product, and polymer malt viscosity and processing temperature are had material impact.If the blowing agent injection rate is unstable or even, obtain the density of foaming product and foam structure with inhomogeneous, and then cause density, mechanical property, the heat-insulating property of goods inhomogeneous, even cause the major defect such as goods buckling deformation, so continous-stable to inject blowing agent be the key that obtains well behaved foam plastic product.
When using carbon dioxide to produce foam plastic product as blowing agent, common way is directly to add from gas bomb by pressure-reducing valve, yet, according to the method, cause the fluctuation of blowing agent flow rate owing to the fluctuation that adds the part resin pressure at blowing agent, occur as a result the foaming non-uniform phenomenon in the goods, and the pressure that is higher than in the gas bomb when blowing agent adding resin pressure partly then can not add blowing agent with the method.
US Patent No. 5450743 discloses a kind of reciprocating plunger pump, the carbon dioxide liquid of certain flow can be pumped out in the chromatographic column by setting position and the plunger reciprocating frequence of plunger in cylinder body.Because fluid pressure is basicly stable in the chromatographic column, so can pump continuously and stably the carbon dioxide of requirement.And for device of plastic processing, the plastic melt pressure oscillation of carbon dioxide injection mouth place is unstable, and the outlet pressure fluctuation will cause plunger pump to go out the liquid flowed fluctuation, and therefore, the plunger displacement pump of this patent disclosure can not be used for continous-stable pumping carbon dioxide to device of plastic processing.
Japanese Patent Laid communique 41161/1994 proposes carbon dioxide storage with pressure in being higher than the tank of critical-temperature, again will carbon dioxide with pressure reduces pressure and be filled with extruder with 9.8MPa or higher pressure to control simultaneously its flow rate.But use this patent will limit the maximum adding quantity of carbon dioxide, if the ratio of carbon dioxide surpasses 2 % by weight and just can not stably be added in the plastic working system, therefore use this system to be difficult to obtain the uniform and stable high-foaming goods of quality, use in addition this technique, the flow rate of carbon dioxide is difficult to control.
Chinese patent CN99118908.6 discloses and a kind of supercritical carbon dioxide has been added method in the plastic molding press, the method is filled with carbon dioxide to the scheduled volume delivery pump from the liquefaction steel cylinder, around here by cooling medium circulator cooled carbon dioxide, and to keep carbon dioxide be liquefaction, by the scheduled volume delivery pump liquefied carbon dioxide is compressed and conveying, and by pressure-control valve the carbon dioxide discharge pressure is controlled at certain limit, then heat this carbon dioxide to more than the critical-temperature (31 ℃) of carbon dioxide, be supercritical carbon dioxide with carbon dioxide conversion, then this supercritical carbon dioxide joined in the device of plastic processing.Although this patent disclosure method can guarantee that supercritical carbon dioxide joins in the device of plastic processing with certain transfer rate, but be liquefaction when guaranteeing that carbon dioxide enters in the delivery pump, this system needs special configuration one cover cooling recirculation system, use the cooling fluid cooled carbon dioxide, usually need to be cooled to below-25 ℃, adopt thermal insulation layer to eliminate the interior heat exchange of delivery pump, device structure is complicated, and need at work to open refrigeration system, operating procedure is complicated and expend time in and the energy, and the heat that produces owing to the plunger displacement pump motion can not be derived, cause temperature rising in the cylinder body, and compressed self temperature of causing of carbon dioxide rises, and these all may cause carbon dioxide in the cylinder body because temperature raises gasifies, thereby affects the pumping efficiency of plunger displacement pump and pump the stability of flow of carbon dioxide.This invention adopts plunger displacement pump and flowmeter to carry out the control of pumping and flow, the flowmeter that is applicable to high-pressure fluid (greater than 15MPa) is not only expensive, and only have the less producer could be according to customer requirements production, simultaneously flowmeter need and plunger displacement pump between set up the control relation and could effectively carry out FEEDBACK CONTROL.
Chinese patent CN200910032842.4 discloses a kind of carbon dioxide foaming agent injection device for producing polystyrene extruded sheet and method for implanting thereof, the foaming agent injection device of this patent disclosure is realized supercharging and the metering conveying of carbon dioxide by two measuring pumps, although this Patent equipment and method adopt the one-level measuring pump to solve the easily problem of gasification of carbon dioxide, but do not solve equally the cooling problem of secondary measuring pump, and because the plastic melt pressure oscillation of carbon dioxide injection mouth place will cause the fluctuation of second order measuring pump outlet pressure in the plastic processing device, these all may cause the secondary measuring pump to pump decrease in efficiency and to pump carbon dioxide flow unstable, and equipment and method obtain the uniform plastic foamed goods of quality thus.
Summary of the invention
For overcoming the technical problems such as the complex structure, instability of flow, the transfer efficiency that exist in the existing apparatus are low, the invention provides a kind of device and method for implanting that the carbon dioxide continous-stable is injected the thermoplastics processing device.
Carbon dioxide continous-stable injection device provided by the present invention, comprise carbon dioxide storage device, pumping installations and liquid transmission pipeline, pass through pipeline connection between carbon dioxide storage device and the pumping installations, the pumping installations outlet is connected with the plastic extruder gas injection port by transfer pipeline, pumping installations outlet liquid line is provided with pressure-regulating device, pumping installations is provided with cooling device and cylinder body, cooling device comprises the cooling chamber of being located at the cylinder body periphery, cooling chamber is provided with entrance and exit, and entrance and exit links to each other with carbon dioxide storage device by liquid transmission pipeline respectively.
Described pumping installations is plunger metering pump or membrane pump.
The invention provides a kind of carbon dioxide continous-stable method for implanting that uses said apparatus, may further comprise the steps: liquid carbon dioxide is transported to pumping installations from carbon dioxide storage device, then be transported to processing unit (plant) by liquid transmission pipeline, liquid carbon dioxide in the carbon dioxide storage device is circulated between carbon dioxide storage device and cooling device by liquid transmission pipeline, carbon dioxide in the cooling pumping installations makes it remain on liquid condition; Regulate the pressure-regulating device on the pumping installations liquid transmission pipeline, make the pumping installations outlet pressure maintain 10 ~ 35MPa; Regulate the frequency of pumping installations or the injection rate of Stroke Control carbon dioxide.
With respect to prior art, the present invention has the following advantages:
1, prior art adopts independent cooling system that plunger displacement pump is cooled off, and not only needs to consume a large amount of energy, increases the special-purpose cooling device of a cover, simultaneously cooling medium is had special requirement, and usually need to be cooled to below-25 ℃ just has effect.And the present invention is connected with carbon dioxide storage device cooling device by pipeline, liquid carbon dioxide in the carbon dioxide storage device circulates between carbon dioxide storage device and cooling device by above-mentioned pipeline, carbon dioxide in the pumping installations is remained on liquid condition, it is simple to have device structure, easy to operate advantage.
2, the present invention adopts the plunger metering pump of one or membrane pump to substitute that plunger displacement pump+flowmeter carries out the control of pumping and flow in the prior art, has obvious advantage, the flowmeter that at first is applicable to high-pressure fluid (greater than 15MPa) is not only expensive, and only have the less producer could be according to customer requirements production, simultaneously flowmeter need and plunger displacement pump between set up the control relation and could effectively carry out FEEDBACK CONTROL.And in fact according to the phasor of carbon dioxide, be pumped medium under the process conditions of the present invention and be in typical liquid condition, be incompressible, therefore adopting plunger metering pump or membrane pump to measure is more reasonable and economic technical scheme.
3, the three-phase equilibrium of carbon dioxide point (gas, liquid and supercritical fluid) is located pressure greatly about 7.8MPa, therefore be in liquid condition in order to ensure it, the present invention is made as 10MPa with minimum pressure, require for foam process simultaneously, usually the design pressure of plastic extruder is 35MPa, if surpassing extruder, pumped medium pressure can bear pressure, might cause damage to extruder system, therefore the selected maximum pump pressurization pressure of the present invention is 35MPa, is suitable for 25MPa.
4, the present invention is with in the direct injected plastic extruded machine of the carbon dioxide liquid of pumping, because the ratio of carbon dioxide in whole rapidoprint system less (being lower than 15%), because high pressure conditions and high-temperature fusant in the extruder, the carbon dioxide that enters is under 150-200 ℃ and the 15-35MPa pressure condition, carbon dioxide is in Supercritical Conditions, therefore be easy to mix and dissolve with plastic melt enter in the plastic melt, form fast homogeneous phase solution.Therefore invention has not only reduced heater, and has reduced the risk that system pressure increases (because the heating carbon dioxide can cause the remarkable increase of system pressure).
In sum, the present invention has the advantages such as device structure is simple, easy to operate, the injection of carbon dioxide continous-stable, has important application aspect the thermoplastic foam production.
The present invention is described further below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the carbon dioxide phasor.
Among the figure, 1, carbon dioxide storage tank, 2, muffler, 3, pressure transmitter, 4, gas injection pipeline, 5, pressure-control valve, 6, the melt check (non-return) valve, 7, machine barrel, 8, screw rod, 9, transmission system, 10, the plunger case cooling chamber, 11, the plunger pump head, 12, fluid check valve, 13, the feed liquor check valve, 14, the liquid transfer manifold, 15, fluid house steward, 16, the liquid cools manifold, 17, the plunger case chamber, 18, plunger metering pump, 20, liquid delivery tube, 21, fluid stop valve.
The specific embodiment
According to shown in Figure 1, carbon dioxide continous-stable method for implanting of the present invention, may further comprise the steps: liquid carbon dioxide is transported to plunger metering pump 18 from carbon dioxide storage tank 1, then is transported to the blowing agent inlet of plastic processing device by liquid transmission pipeline.
Carbon dioxide continous-stable injection device of the present invention comprises: carbon dioxide storage tank 1, plunger metering pump 18 and pressure-control valve 5 and blowing agent inlet, plunger metering pump 18 pump heads adopt jacket structured, introduce the carbon dioxide liquid from carbon dioxide storage tank 1 in the chuck, plunger pump cylinder body is cooled off, prevent carbon dioxide liquid gasification in the cylinder body, outlet of plunger pump guarantees that by pressure-control valve 5 plunger metering pump 18 outlet pressures keep being stabilized in setting value.
Specifically, carbon dioxide continous-stable injection device comprises: carbon dioxide storage tank 1, plunger metering pump 18 and pressure-control valve 5 and blowing agent inlet, carbon dioxide storage tank 1 lower liquid partly offers liquid outlet, liquid outlet is connected with plunger metering pump 18 by fluid house steward 15, liquid transfer manifold 14 and liquid cools manifold 16, and the entrance of the entrance of liquid transfer manifold 14 and liquid cools manifold 16 is connected with fluid house steward 15.Plunger metering pump 18 comprises transmission system 9, plunger pump head 11, plunger case, plunger case is provided with plunger case chamber 17, plunger case is provided with plunger case cooling chamber 10 outward, 14 outlets of liquid transfer manifold are connected with plunger case chamber 17 entrances, plunger case chamber 17 entrances are equipped with feed liquor check valve 13,17 outlets of plunger case chamber are connected by liquid delivery tube 20 with pressure-control valve 5 entrances, 17 outlets of plunger case chamber are equipped with fluid check valve 12, pressure-control valve 5 outlets are connected with blowing agent inlet on the plastic extruder by gas injection pipeline 4, the blowing agent inlet is equipped with melt check (non-return) valve 6, prevents that polymer melt from entering liquid line; Form closed-loop control between pressure-control valve 5 and the pressure transmitter 3, be stabilized in a reasonably interval with the carbon dioxide liquid force value (pressure transmitter 3 locates) in 17 outlets of assurance plunger case chamber and the muffler 20, by changing ram travel and/or the frequency of plunger metering pump 18, just can accurately control the fluid flow through 17 outlets of plunger case chamber like this.
In addition, at the liquid transmission pipeline between the blowing agent inlet on pressure-control valve 5 and the plastic extruder fluid stop valve 21 is installed.When carbon dioxide pumping system starts, fluid stop valve 21 is closed, to guarantee the liquid delivery tube 20 interior energy build-up pressures between pumping system and the plastic extruder gas injection port, the carbon dioxide that assurance pumps out is liquid condition, fluid pressure in liquid delivery tube 20 (force value that pressure transmitter 3 records) is when reaching 10MPa, open fluid stop valve, guarantee that by regulating pressure-control valve 5 pressure in the liquid delivery tube 20 maintains between 10 ~ 35MPa.
16 outlets of liquid cools manifold are connected with plunger case cooling chamber 10 entrances, plunger case cooling chamber 10 tops arrange an outlet, this outlet is connected with carbon dioxide storage tank 1 top by muffler 2, so that the carbon dioxide of plunger case cooling chamber 10 interior gasifications is got back to carbon dioxide storage tank 1 by this outlet and muffler 2.
Carbon dioxide storage tank 1 interior storing carbon dioxide liquid, liquids in general pressure maintains the vapour pressure of 2.2MPa(room temperature carbon dioxide) about, storage tank is vertically placed, near the place, bottom the carbon dioxide liquid outlet is arranged, by this outlet and fluid line liquid CO 2 is flowed to plunger metering pump 18.In order to monitor the content liquid in the carbon dioxide storage tank, on the carbon dioxide storage tank 1 liquid level gauge and pressure transmitter can be installed, and carbon dioxide storage tank 1 top is equipped with automatic blow off valve valve air relief, when tank inner pressure surpasses certain value, automatic blow off valve valve air relief is opened, and the carbon dioxide of gasification is got rid of to guarantee storage tank safety.
Fluid house steward 15 entrance is communicated with the outlet fluid-phase of carbon dioxide storage tank 1 liquid, and fluid house steward 15 outlet is connected with the entrance of liquid transfer manifold 14 and the inlet fluid of liquid cools manifold 16.On fluid house steward 15, the stop valve (not shown) can be installed, with flowing of control carbon dioxide storage tank 1 interior carbon dioxide liquid, when stop valve is opened, carbon dioxide liquid in the carbon dioxide storage tank 1 can flow by fluid house steward 15, when stop valve was closed, the carbon dioxide liquid in the carbon dioxide storage tank 1 can not flow by fluid house steward 15.Liquid transfer manifold 14 can optionally be installed the stop valve (not shown), and the control carbon dioxide liquid reaches plunger case chamber 17 by liquid transfer manifold 14.Liquid cools manifold 16 can optionally be installed the stop valve (not shown), and the control carbon dioxide liquid reaches plunger case cooling chamber 10 by liquid cools manifold 16.Fluid house steward 15, liquid transfer manifold 14 and liquid cools manifold 16 are industrial cryogenic liquid carrier pipe commonly used, are suitable for gapless stainless steel tube.Fluid house steward 15 length should be lacked as far as possible, and fluid house steward 15 and all connecting lines should be taked preferably heat insulation measure simultaneously, reduce liquid CO 2 amount of vaporization out in the storage tank as far as possible.
Plunger metering pump 18 is comprised of plunger case chamber 17 and the plunger pump head 11 of transmission system 9, plunger case cooling chamber 10.Transmission system 9 drives plunger 11 in the 17 interior reciprocating motions of plunger pump chamber, realizes supercharging and pump action to carbon dioxide liquid.Transmission system 9 is industrial general motor that can adjustment movement speed.Liquid cools manifold 16 is communicated with plunger case cooling chamber 10 fluid-phases, carbon dioxide liquid in the carbon dioxide storage tank 1 is introduced plunger case cooling chamber 10, be used for cooling plunger pump head 11 and plunger case chamber 17, and plunger pump head 11 is moved back and forth the heat that produces derive, to guarantee that the carbon dioxide that enters plunger case chamber 17 by liquid transfer manifold 14 keeps lower temperature, is in liquid condition.Plunger case cooling chamber 10 tops arrange an outlet, and this outlet is connected with carbon dioxide storage tank 1 top by muffler 2, so that the carbon dioxide of plunger case cooling chamber 10 interior gasifications is got back to carbon dioxide storage tank 1 by this outlet and muffler 2.
When metering and pumping liquid, because liquid has Incoercibility, the liquid volume that therefore from plunger metering pump 18, pumps and the volume V in plunger case chamber 17
0And there is following relation between the reciprocating frequency f of plunger:
W
1=V
0*F*ρ
W
1: unit interval pumping liquid quality, i.e. the pumping flow rate of plunger displacement pump;
V
0: the volume in plunger case chamber;
F: plunger reciprocating frequency;
ρ: liquid CO 2 density
Therefore, by the size in adjustable column plug cylinder chamber 17, i.e. the reciprocating frequence of the stroke of plunger pump head 11, and/or plunger pump head 11 just can be determined the pumping flow rate of plunger metering pump 18, thereby realizes metering and the stable output of convection cell.For carbon dioxide, its state and temperature and pressure are closely related, the carbon dioxide phasor as shown in Figure 2, pressure carbon dioxide is when 2.2MPa, temperature is lower than-20 ℃ of carbon dioxide when being higher than-50 ℃ for liquid.During pressure 2.2MPa, if temperature is higher than-20 ℃, then carbon dioxide is in gaseous state, and gas has compressibility, and the density of gas and gas temperature, pressure are relevant, change with temperature and pressure, and or not constant.Therefore, just can not realize metering and the stable output of convection cell with plunger metering pump.When being used for carbon dioxide metering and pumping for industrial plunger metering pump, guarantee that carbon dioxide is in the key that liquid condition is stable metering output.The present invention adopts and directly draws carbon dioxide liquid to the cooling chamber of plunger metering pump 18 from carbon dioxide storage tank, is used for plunger case chamber 17 and the plunger pump head 11 in cooling plunger metering pump chamber, can guarantee that like this carbon dioxide is liquid condition in the plunger pump chamber.Outlet is offered on the top of plunger case cooling chamber 10 in apparatus of the present invention, is back in the carbon dioxide storage tank 1 by the carbon dioxide of muffler 2 with gasification.
14 outlets of liquid transfer manifold are connected with plunger case chamber 17 inlet fluids, on liquid transmission pipeline, feed liquor check valve 13 is installed in 17 porch, plunger case chamber, the control carbon dioxide liquid enters plunger case chamber 17 from carbon dioxide storage tank 1, and the carbon dioxide in the prevention plunger case chamber 17 is to carbon dioxide storage tank 1 adverse current.
Plunger case chamber 17 outlet is connected with carbon dioxide injection mouth fluid-phase on the plastic extruder by liquid delivery tube 20, at liquid delivery tube 20 pressure-control valve 5 is installed.Pressure-control valve 5 is that a pressure is regulated limiting valve, by regulating the aperture of pressure-control valve 5, the fluid pressure that can control in the liquid delivery tube 20 between 17 outlets of plunger case chamber and the pressure-control valve 5 is a certain setting value, when this section pipeline inner pressure surpasses setting value, carbon dioxide enters the blowing agent gas injection port by pressure-control valve 5, when if this section pipeline inner pressure is lower than this setting value, carbon dioxide can not pass through pressure-control valve 5.Setting pressure transmitter 3 on the liquid delivery tube 20 between plunger metering pump 18 and the pressure-regulating valve 5, be used for the pressure in the monitoring liquid carrier pipe 20, and the aperture of FEEDBACK CONTROL pressure-control valve 5, make the pressure in the liquid delivery tube 20 remain between 10 ~ 35MPa the more suitable 10 ~ 25MPa that remains on.If the pressure in the liquid delivery tube 20 is lower than 10MPa, at room temperature carbon dioxide gasifies easily, and form dry ice block liquid carrier pipe 20, if liquid delivery tube 20 internal pressures are higher than 35MPa, cause the plunger metering pump load to increase one side, pumping efficiency reduces, and on the other hand the voltage withstand class of line seal system is proposed requirements at the higher level, cause line seal and pipe connecting component cost to increase, and there is potential safety hazard in equipment.
In order to guarantee that carbon dioxide can enter in the extruder to steady and continuous, enter the porch of extruder at carbon dioxide, melt check (non-return) valve 6 is installed, prevent that the melt of extruder inner high voltage from entering into gas injection pipeline 4, stop up.Machine barrel 7 and screw rod 8 be the polymer melting of solid, and molten polymer is mixed under high temperature and high pressure with liquid CO 2, carries out foaming after forming homogeneous phase solution.
Pumping installations of the present invention can also adopt membrane pump except plunger metering pump, its advantage and plunger metering pump similar.Compared with prior art, the present invention have device structure simple, easy to operate, can the continous-stable injecting carbon dioxide etc. characteristics.
Claims (7)
1. carbon dioxide continous-stable injection device, comprise carbon dioxide storage device, pumping installations and liquid transmission pipeline, be communicated with by liquid transmission pipeline between carbon dioxide storage device and the pumping installations, the pumping installations outlet is connected with the plastic extrusion apparatus gas injection port by liquid transmission pipeline, pumping installations outlet liquid transmission pipeline is provided with pressure-regulating device, it is characterized in that, pumping installations is provided with cooling device and cylinder body, described cooling device comprises the cooling chamber of being located at described cylinder body periphery, described cooling chamber is provided with entrance and exit, and described entrance and exit links to each other with carbon dioxide storage device by liquid transmission pipeline respectively.
2. carbon dioxide continous-stable injection device according to claim 1, it is characterized in that, described carbon dioxide storage device is provided with liquid outlet, liquid outlet is connected with export pipeline, export pipeline is divided into cooling manifold and transfer manifold, cooling manifold links to each other with cooling chamber, and transfer manifold links to each other with pumping installations.
3. carbon dioxide continous-stable injection device according to claim 1 and 2 is characterized in that described pumping installations is provided with liquid inlet and liquid outlet, and liquid inlet and the liquid outlet of described pumping installations are equipped with check valve.
4. carbon dioxide continous-stable injection device according to claim 1 is characterized in that, the liquid transmission pipeline that fluid is communicated with between pumping installations and the plastic extrusion apparatus is provided with stop valve, and described stop valve is between pressure-regulating device and gas injection port.
5. carbon dioxide continous-stable injection device according to claim 1 is characterized in that, described pumping installations is plunger metering pump or membrane pump.
6. a right to use requires the carbon dioxide continous-stable method for implanting of 1 described carbon dioxide continous-stable injection device, may further comprise the steps: liquid carbon dioxide is transported to pumping installations from carbon dioxide storage device, then be transported to processing unit (plant) by liquid transmission pipeline, liquid carbon dioxide in the carbon dioxide storage device is circulated between carbon dioxide storage device and cooling device by liquid transmission pipeline, carbon dioxide in the cooling pumping installations makes it remain on liquid condition; Regulate the pressure-regulating device on the pumping installations liquid transmission pipeline, make the pumping installations outlet pressure maintain 10 ~ 35MPa; Regulate the frequency of pumping installations or the injection rate of Stroke Control carbon dioxide.
7. carbon dioxide continous-stable method for implanting according to claim 6 is characterized in that described pumping installations outlet pressure maintains 10 ~ 25MPa.
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| CN 201010582593 CN102133785B (en) | 2010-12-07 | 2010-12-07 | Carbon dioxide continuous and stable injection method and device |
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| CN 201010582593 CN102133785B (en) | 2010-12-07 | 2010-12-07 | Carbon dioxide continuous and stable injection method and device |
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| CN102133785B true CN102133785B (en) | 2013-10-30 |
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| CN106288970B (en) * | 2016-09-23 | 2018-12-28 | 河北工业大学 | A kind of vehicle-mounted carbon dioxide expander charging system |
| CN108150376A (en) * | 2018-01-31 | 2018-06-12 | 福建双环能源科技股份有限公司 | A kind of plunger pump for pumping ultra-low temperature liquid nitrogen |
| CN115541821B (en) * | 2022-09-23 | 2023-04-14 | 清华大学 | Seabed carbon dioxide sequestration, monitoring and early warning integrated simulation device and method |
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| CN202021738U (en) * | 2010-12-07 | 2011-11-02 | 北京化工大学 | Carbon dioxide foaming agent metering injection system for extrusion foaming |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4309502B2 (en) * | 1999-02-03 | 2009-08-05 | 昭和炭酸株式会社 | Equipment for supplying foaming agent to resin foam molding machine |
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| CN1247125A (en) * | 1998-07-16 | 2000-03-15 | 三井化学株式会社 | Method for adding in supercritical CO2, and method for producing foamed thermal plastic resin products by same adding method |
| CN101480831A (en) * | 2009-01-19 | 2009-07-15 | 北京中拓机械有限责任公司 | Supercritical fluid aerating powder conveying device and control method |
| CN101559640A (en) * | 2009-06-04 | 2009-10-21 | 南京法宁格节能科技有限公司 | Carbon dioxide foaming agent injection device for producing polystyrene extruded sheet and injection method thereof |
| CN101830049A (en) * | 2010-06-17 | 2010-09-15 | 北京中拓机械有限责任公司 | Metering system for supercritical fluid foaming agent |
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| JP特开2000-218647A 2000.08.08 |
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