CN117358738A - Multiphase separation device and method in vacuum extraction - Google Patents
Multiphase separation device and method in vacuum extraction Download PDFInfo
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- CN117358738A CN117358738A CN202210770412.8A CN202210770412A CN117358738A CN 117358738 A CN117358738 A CN 117358738A CN 202210770412 A CN202210770412 A CN 202210770412A CN 117358738 A CN117358738 A CN 117358738A
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- 238000000926 separation method Methods 0.000 title claims abstract description 152
- 238000000605 extraction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 230000005484 gravity Effects 0.000 claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 239000002245 particle Substances 0.000 claims abstract description 36
- 239000007787 solid Substances 0.000 claims abstract description 35
- 230000004888 barrier function Effects 0.000 claims abstract description 29
- 239000000284 extract Substances 0.000 claims abstract description 26
- 239000007791 liquid phase Substances 0.000 claims abstract description 16
- 230000001737 promoting effect Effects 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 claims description 104
- 238000007667 floating Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 12
- 239000000523 sample Substances 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000012808 vapor phase Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 239000012071 phase Substances 0.000 abstract description 7
- 239000012855 volatile organic compound Substances 0.000 abstract description 5
- 238000005119 centrifugation Methods 0.000 abstract 1
- 235000019198 oils Nutrition 0.000 description 78
- 239000007789 gas Substances 0.000 description 20
- 239000002689 soil Substances 0.000 description 15
- 238000005067 remediation Methods 0.000 description 7
- 238000011065 in-situ storage Methods 0.000 description 6
- 230000008439 repair process Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 239000003209 petroleum derivative Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000003900 soil pollution Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 238000003895 groundwater pollution Methods 0.000 description 2
- 235000019476 oil-water mixture Nutrition 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 1
- 238000006124 Pilkington process Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000008206 lipophilic material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention provides a multiphase separation device and a multiphase separation method in vacuum extraction, wherein the multiphase separation device comprises a barrier net and a reaction kettle, the barrier net is arranged inside the reaction kettle, the barrier net is composed of a plurality of layers of inclined plates which are vertically arranged with each other and used for promoting the liquefaction of water vapor in a gas phase of an extract, a gravity separation cavity and a centrifugal separation cavity are also arranged inside the reaction kettle, wherein the centrifugal separation cavity is positioned at the lower side of the barrier net, and the gravity separation cavity is positioned at the lower side of the centrifugal separation cavity. According to the invention, the separation net, the centrifugal separation cavity and the gravity separation cavity are arranged, the centrifugal separation cavity is used for centrifugally separating the extract, the separation net is used for promoting the gasified extract to be liquefied, then the extract is returned to the centrifugal separation cavity, and the gravity separation cavity is used for carrying out gravity separation on the liquid phase and the solid particles after centrifugation. In the process, barrier separation, centrifugal separation and gravity separation are effectively combined together, and oil, water, high-concentration VOCs gas and solid particles extracted in the SVE technology repairing process are effectively separated.
Description
Technical Field
The invention belongs to the technical field of in-situ remediation of petroleum hydrocarbon contaminated sites, and particularly relates to a multiphase separation device and method in vacuum extraction.
Background
It is common for soil and groundwater pollution events to occur as a result of leaks in gas stations, finished oil reservoirs. After oil leaks, a part of the oil is removed by volatilization, degradation and the like, but part of the petroleum hydrocarbon stays in the natural environment for a long time, pollutes soil and underground water, and threatens human health. To date, petroleum hydrocarbon pollution has become an important factor in soil and groundwater pollution.
The leaked oil products of the gas station and the finished oil warehouse storage tank are mainly gasoline and diesel oil, and the pollution components mainly comprise gasoline and diesel oil, benzene series, polycyclic aromatic hydrocarbon, MTBE and the like. According to the classification of the disposal sites of the soil pollution remediation technology, the remediation mode of the petroleum pollution soil mainly comprises in-situ remediation and ex-situ remediation, wherein the in-situ remediation has the characteristics of low investment and small influence on the surrounding environment.
Soil gas phase suction (Soil Vapor Extraction, SVE) is a soil in-situ remediation technology, negative pressure is formed by vacuum extraction, and when the unsaturated zone of the soil forms directional flow of air, volatile and semi-volatile organic compounds in the soil gap are resolved and entrained when the air flows through a polluted area, so that the aim of purifying the soil is fulfilled. The method is mainly used for repairing volatile semi-volatile organic pollutants, and has good effect on treating a polluted stratum which is homogeneous and has good permeability.
The currently known separation modes mainly comprise gravity separation, centrifugal separation, electric separation, adsorption separation, air floating separation, barrier separation and the like.
(1) And (5) separating by gravity. According to the relative density of the extractives, the oil-water mixture forms certain oil and water phases under certain pressure and temperature when the system is in balance. This technique requires a large vessel and a low flow rate, and the separation speed is slow.
(2) And (5) centrifugal separation. The oil-water mixture rotating at high speed generates different centrifugal forces by utilizing different densities, so that oil and water are separated. This technique cannot achieve fine separation.
(3) And (5) electric separation. In the form of electro-evaporation as the final means of oil-water treatment. The technology has high power consumption and high energy consumption.
(4) And (5) adsorption separation. And (3) absorbing dissolved oil and other soluble organic matters in the wastewater by utilizing the lipophilic material. A common material is activated carbon. The technology has the advantages of quick saturation of the adsorption material, frequent replacement and high cost.
(5) And (5) air floatation separation. The air-float method is a method for purifying water by forming tiny bubbles in water and carrying the floccules to float up to the liquid level. Provided that the bubbles attached to the oil droplets form oil-gas particles. The technology has large occupied area, produces scum and is difficult to treat floating oil.
(6) Separation is blocked. A barrier net is used for forming liquid-gas separation, and then the tail gas advanced treatment is carried out. The traditional barrier net adopts a vertical net structure, so that the liquefaction promoting effect is poor. The invention adopts the mutually overlapped multi-layer inclined plates, increases the contact area and has excellent liquefaction promoting effect.
Although SVE uses the in-situ repair technology with highest efficiency, the single separation mode is used, and the fact that the extract cannot be separated efficiently and rapidly is always a disadvantage.
Disclosure of Invention
The invention provides a multiphase separation device and a multiphase separation method in vacuum extraction.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a multiphase separation device in vacuum extraction comprises a barrier net and a reaction kettle;
the barrier net is arranged inside the reaction kettle;
the barrier net consists of a plurality of layers of inclined plates which are vertically arranged with each other and is used for promoting the liquefaction of water vapor in the gas phase of the extract;
a gravity separation cavity and a centrifugal separation cavity are also arranged in the reaction kettle;
the centrifugal separation cavity is positioned at the lower side of the barrier net;
the gravity separation chamber is located at the lower side of the centrifugal separation chamber.
Preferably, the centrifugal separation cavity is in an inverted truncated cone structure and is positioned in the middle section of the reaction kettle.
Preferably, the reaction kettle is also communicated with a suction pipe, and the suction pipe is positioned between the barrier net and the centrifugal separation cavity.
Preferably, the reaction kettle is further communicated with an oil drain port, one end of the oil drain port is connected with an oil drain hose, and the oil drain hose is positioned in the gravity separation cavity.
Preferably, the gravity separation cavity is internally provided with an oil-water interface instrument, the oil-water interface instrument is fixedly connected with an oil discharge hose, the oil-water interface instrument comprises a probe and a floating oil pump, the probe is used for sensing thickness and liquid level change of an oil layer, and the floating oil pump is used for timely transferring oil to an oil discharge port.
Preferably, the top end of the reaction kettle is provided with an exhaust pipe, the bottom of the reaction kettle is provided with a drain pipe, and the drain pipe is communicated with the gravity separation cavity.
Preferably, the circumference side surface of the reaction kettle is also provided with a manhole.
Preferably, the surface of the reaction kettle is also provided with a flange for blocking the replacement of the net.
A multiphase separation process in vacuum extraction comprising the steps of:
injecting the extract into a reaction kettle;
carrying out centrifugal separation on the extract in a centrifugal separation cavity in a reaction kettle;
under the centrifugal action, high-density solid particles and liquid phase in the extract move downwards to a gravity separation cavity at the lower side of the centrifugal separation cavity, and low-density gas rises to a barrier net at the upper side of the centrifugal separation cavity;
the barrier net enables water vapor in the low-density gas to form water drops to fall into the centrifugal separation cavity through a plurality of layers of inclined plates which are vertically arranged;
meanwhile, the high-density solid particles and the liquid phase are layered under the action of gravity according to the difference of the densities of the high-density solid particles and the liquid phase, and are sequentially oil, water and solid particles from top to bottom.
Preferably, the multiphase separation process in vacuum extraction further comprises an oil separation step:
when the high-density solid particles and the liquid phase are divided into an oil layer, a water layer and a solid particle layer under the action of gravity, a probe in an oil-water interface instrument in a gravity separation cavity senses the oil layer;
after the probe senses the oil layer, a floating oil pump in the oil-water interface instrument transfers the oil layer, the floating oil pump sequentially transfers the oil layer to an oil discharging hose connected with the oil-water interface instrument and an oil discharging port connected with the oil discharging hose, and finally, the oil layer is discharged through the oil discharging port.
Preferably, the separation step of water and solid particles is included:
when the oil layer is completely discharged through the oil discharge port, a drain pipe positioned at the bottom of the reaction kettle is opened, and the water layer and the solid particle layer are discharged.
The invention has the beneficial effects that:
according to the invention, the separation net, the centrifugal separation cavity and the gravity separation cavity are used, the extract is centrifuged in the centrifugal separation cavity, the separation net promotes the gasified extract to be liquefied, and then the gasified extract returns to the centrifugal separation cavity, the gravity separation cavity performs gravity separation on the centrifuged liquid phase and solid particles, the separation net, the centrifugal separation and the gravity separation are effectively combined together in the process, and the oil, the water, the high-concentration VOCs gas and the solid particles extracted in the SVE technology repairing process are effectively separated.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic structure of a multiphase separation device in vacuum extraction according to the present invention;
FIG. 2 shows a schematic view of the structure of the baffle plate of the present invention;
fig. 3 shows a connection diagram of the multiphase separation device according to the invention with an external structure.
In the figure: 1. a suction pipe; 2. a flange; 3. a barrier web; 4. an exhaust pipe; 5. an oil drain hose; 6. an oil drain port; 7. a gravity separation chamber; 8. a blow-down pipe; 9. an oil-water interface instrument; 10. a manhole; 11. a centrifugal separation chamber; 12. and (3) a reaction kettle.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a multiphase separation device in vacuum extraction, which is shown in figure 1 and comprises a barrier net 3 and a reaction kettle 12;
the top of the reaction kettle 12 is provided with an exhaust pipe 4, the bottom of the reaction kettle 12 is provided with a drain pipe 8, the drain pipe 8 is communicated with the gravity separation cavity 7, and in addition, a filter screen is generally arranged in the drain pipe 8, so that solid-liquid separation can be effectively carried out.
The separation net 3 is arranged inside the reaction kettle 12, as shown in fig. 2, and is composed of a plurality of inclined plates which are vertically arranged, and is used for promoting the liquefaction of vapor in the vapor phase of the extract, a gravity separation cavity 7 and a centrifugal separation cavity 11 are further arranged inside the reaction kettle 12, the centrifugal separation cavity 11 is positioned at the lower side of the separation net 3, the centrifugal separation cavity 11 can be used for centrifuging the extract, the gravity separation cavity 7 is positioned at the lower side of the centrifugal separation cavity 11, and the extract is subjected to gravity separation according to different liquid phase densities by utilizing gravity.
The centrifugal separation cavity 11 is in an inverted truncated cone structure and is positioned in the middle section of the reaction kettle 12.
Further, the reaction kettle 12 is also communicated with a suction pipe 1, and the suction pipe 1 is positioned in the tangential direction of the outer circle of the centrifugal separation cavity 11. When in operation, the vacuum pump forms negative pressure in the centrifugal separation cavity 11, then the extract enters the centrifugal separation cavity 11 through the suction pipe 1 in a tangential direction at a certain speed, and then the extract rotates along the outer wall of the centrifugal separation cavity 11 to realize the separation of phases.
Further, the reaction kettle 12 is further communicated with an oil drain port 6, one end of the oil drain port 6 is connected with an oil drain hose 5, the oil drain hose 5 is located in the gravity separation cavity 7, an oil-water interface instrument 9 is further arranged in the gravity separation cavity 7, the oil-water interface instrument 9 is fixedly connected with the oil drain hose 5, the oil-water interface instrument 9 comprises a probe and an oil floating pump, the probe is used for sensing thickness and liquid level change of an oil layer, and the oil floating pump is used for timely transferring oil to the oil drain port 6.
Further, the surface of the circumference side of the reaction kettle 12 is also provided with a manhole 10;
the manhole 10 is communicated with the gravity separation chamber 7, and a worker can open the manhole 10 periodically and then clean solid particles remained in the gravity separation chamber 7.
Further, the surface of the reaction kettle 12 is also provided with a flange 2 for replacing the barrier net 3.
The reaction kettle 12 is divided into an upper part and a lower part by the flange 2, and when the barrier net 3 is replaced, the barrier net 3 can be replaced only by separating the upper part and the lower part of the reaction kettle 12.
A multiphase separation process in vacuum extraction comprising the steps of:
injecting the extract into the reaction vessel 12;
the extract is centrifugally separated in a centrifugal separation cavity 11 in a reaction kettle 12;
under the centrifugal action, high-density solid particles and liquid phase in the extract move downwards to a gravity separation cavity 7 at the lower side of a centrifugal separation cavity 11, and low-density gas rises to a barrier net 3 at the upper side of the centrifugal separation cavity 11;
the barrier net 3 enables water vapor in the low-density gas to form water drops to fall into the centrifugal separation cavity 11 through a plurality of layers of inclined plates which are vertically arranged;
meanwhile, the high-density solid particles and the liquid phase are layered under the action of gravity according to the difference of the densities of the high-density solid particles and the liquid phase, and are sequentially oil, water and solid particles from top to bottom.
Further, the multiphase separation method in vacuum extraction further comprises the step of separating oil:
when the high-density solid particles and the liquid phase are divided into an oil layer, a water layer and a solid particle layer under the action of gravity, a probe in an oil-water interface instrument 9 in the gravity separation cavity 7 senses the oil layer;
after the probe senses the oil layer, the oil layer is transported by the oil floating pump in the oil-water interface instrument 9, the oil layer is transported by the oil floating pump to be sequentially transported to the oil discharging hose 5 connected with the oil-water interface instrument 9 and the oil discharging port 6 connected with the oil discharging hose 5, and finally, the oil layer is discharged through the oil discharging port 6.
Further, the multiphase separation method in vacuum extraction further comprises the steps of separating water and solid particles:
after the oil layer is completely discharged through the oil discharge port 6, a drain pipe 8 positioned at the bottom of the reaction kettle 12 is opened, and the water layer and the solid particle layer are discharged.
Before the multiphase separation device and the multiphase separation method in the vacuum extraction are used, the line is subjected to field investigation and analysis to determine that main extracts of pollution sites such as gas stations, oil reservoirs and the like are oil, water, high-concentration VOCs gas and a small amount of solid particles are attached. As shown in fig. 3, according to the field pollution investigation result and the soil characteristics, an extraction well is arranged, wherein the extraction pipeline can be properly adjusted according to the change of the free phase liquid level. A water ring vacuum pump is selected as a core part of the SVE device, and the pressure value in the vacuum degree range is set to be 30-70kPa (absolute pressure). The separation device is arranged at the front end of the suction pipe of the vacuum pump, the rear end of the vacuum pump is connected with the tail gas treatment device, the exhaust pipe 4 is connected with the suction pipe of the vacuum pump in a line way, and a butterfly valve is arranged on a passage of the vacuum pump connected with the multiphase separation device. The main pipeline of the extraction well is connected with the separation device, a basket filter is arranged at the front section of the separation device for better protection system, the service life of the separation device is protected, an electric control valve is adopted at the front section of the multiphase separation device, and remote operation can be carried out through PLC automatic control.
The centrifugal separation chamber 11 is welded to the lower half of the separation device.
The vacuum pump is started, negative pressure is formed in the separating device, the extract enters the centrifugal separating cavity 11 from the tangential direction of the centrifugal separating cavity 11 through the suction pipe 1, centrifugal force is generated, and under the action of the centrifugal force, low-density gas rises, and high-density solid particles and liquid phases move downwards.
The upper part of the reaction kettle 12 is provided with a blocking net 3 which adopts a sloping plate type and consists of a plurality of layers of sloping plate materials which are mutually and vertically arranged. In the gas rising process, the liquefaction of vapor in the contact gas phase can be obviously improved. Finally, the gas continues upwards and is conveyed to the tail gas treatment unit via the vacuum pump, and the water vapour then drops down to the centrifugal separation chamber 11 as water droplets.
The oil, sewage and solid particles are transferred from the centrifugal separation cavity 11 to the gravity separation cavity 7, and are obviously layered under the action of gravity according to the difference of the self density, and the oil, the water and the solid particles are sequentially arranged from top to bottom.
An oil-water interface instrument 9 is arranged in the device and is related to a PLC control interface, so that the thickness and liquid level change of an oil layer can be accurately known, and oil is transported through the oil drain port 6 in real time through a floating oil pump.
The front end of the blow-down pipe 8 is provided with a fine filter screen, so that water and solid particles can be effectively separated. Finally, the filtered sewage is discharged to a waste liquid collecting barrel through a sewage discharge pipe 8.
The manhole 10 may be opened periodically to collect small amounts of solid particles.
It should be noted that the contaminated site repair is a long-term process, the device reduces repair time to a certain extent, so that the repair process is more efficient and reasonable, the whole separation process is carried out in the device, no secondary pollution is caused in the whole process, in addition, oil is inflammable, and the oil is stored in the separation device for a certain time and isolated from the outside, so that potential safety hazards are avoided.
Taking a specific practical situation as an example, performing in-situ repair technology field application test on a certain finished oil pollution site.
Pollution distribution: 1.5m: benzene, 3.5m-4.5m: TPH, BTEX.
The soil layer distribution condition is that 0-1m is mixed filling soil, and clay is the main material; filling the 1-2m part with mixed soil mainly comprising silt; 2-3m of sand, mainly powder sand, and initially seen underground water; 3-4m of sand soil, namely groundwater. The sandy soil is between the silt and the silt, and the permeability coefficient is 0.5-1.0m/d and the porosity is 42-47% by referring to the hydrogeology manual, so that the SVE repairing condition is satisfied.
In combination with earlier investigation of the distribution range of pollutants, 33 pumping wells are arranged, and the depth of each pumping well is 7 meters. The number of the well distribution meets the requirement. And (5) completing pipeline connection according to well positions and SVE equipment repairing processes. The water level burial depth is about 4 meters, the average thickness of the oil layer is 0.15 meter, and the maximum thickness of the ACX10 well is 0.59 meter.
The test is stopped from day 10, day 19 to day 11, and day 14, the SVE equipment is operated for 168 hours in a cumulative way, and the extraction amount is as follows: oil 0.971M 3 The method comprises the steps of carrying out a first treatment on the surface of the 37.592M oily sewage 3 The method comprises the steps of carrying out a first treatment on the surface of the High concentration VOCs gas 90436.8M 3 。
The multiphase separation device has good effect and no fault occurrence in the application process, and provides effective guarantee for the popularization of SVE technology in industry.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. The multiphase separation device in vacuum extraction is characterized by comprising a barrier net (3) and a reaction kettle (12);
the blocking net (3) is arranged inside the reaction kettle (12);
the barrier net (3) consists of a plurality of layers of inclined plates which are vertically arranged with each other and is used for promoting the liquefaction of water vapor in the vapor phase of the extract;
a gravity separation cavity (7) and a centrifugal separation cavity (11) are also arranged in the reaction kettle (12);
the centrifugal separation cavity (11) is positioned at the lower side of the barrier net (3);
the gravity separation cavity (7) is positioned at the lower side of the centrifugal separation cavity (11).
2. The multiphase separation device in vacuum extraction according to claim 1, wherein the centrifugal separation chamber (11) has an inverted truncated cone structure and is positioned in the middle section of the reaction kettle (12).
3. A multiphase separation device in vacuum stripping according to claim 1 wherein the reactor (12) is further connected with a suction pipe (1), the suction pipe (1) being located between the barrier net (3) and the centrifugal separation chamber (11).
4. The multiphase separation device in vacuum extraction according to claim 1, wherein the reaction kettle (12) is further communicated with an oil drain port (6), one end of the oil drain port (6) is connected with an oil drain hose (5), and the oil drain hose (5) is located in the gravity separation cavity (7).
5. The multiphase separation device in vacuum extraction according to claim 4, wherein an oil-water interface instrument (9) is further arranged in the gravity separation cavity (7), the oil-water interface instrument (9) is fixedly connected with an oil discharge hose (5), the oil-water interface instrument (9) comprises a probe and a floating oil pump, the probe is used for sensing thickness and liquid level change of an oil layer, and the floating oil pump is used for timely transferring oil to an oil discharge port (6).
6. Multiphase separation device in vacuum extraction according to any one of claims 1-5 wherein the top of the reactor (12) is provided with an exhaust pipe (4), the bottom of the reactor (12) is provided with a blow down pipe (8), the blow down pipe (8) is in communication with the gravity separation chamber (7).
7. A multiphase separation device in vacuum stripping according to any one of claims 1-5 wherein the peripheral surface of the reactor (12) is further provided with manholes (10).
8. Multiphase separation device in vacuum stripping according to any one of claims 1-5 characterized in that the surface of the reactor (12) is also provided with flanges (2) for barrier net (3) replacement.
9. A method for multiphase separation in vacuum extraction, comprising the steps of:
injecting the extract into a reaction vessel (12);
the extract is centrifugally separated in a centrifugal separation cavity (11) in a reaction kettle (12);
under the centrifugal action, high-density solid particles and liquid phase in the extract move downwards to a gravity separation cavity (7) at the lower side of a centrifugal separation cavity (11), and low-density gas rises to a barrier net (3) at the upper side of the centrifugal separation cavity (11);
the barrier net (3) enables water vapor in the low-density gas to form water drops to fall into the centrifugal separation cavity (11) through a plurality of layers of inclined plates which are vertically arranged;
meanwhile, the high-density solid particles and the liquid phase are layered under the action of gravity according to the difference of the densities of the high-density solid particles and the liquid phase, and are sequentially oil, water and solid particles from top to bottom.
10. A multiphase separation process in vacuum stripping as recited in claim 9, comprising the step of separating oil:
when the high-density solid particles and the liquid phase are divided into an oil layer, a water layer and a solid particle layer under the action of gravity, a probe in an oil-water interface instrument (9) in the gravity separation cavity (7) senses the oil layer;
after the probe senses the oil layer, a floating oil pump in the oil-water interface instrument (9) transfers the oil layer, the floating oil pump sequentially transfers the oil layer to an oil discharging hose (5) connected with the oil-water interface instrument (9) and an oil discharging port (6) connected with the oil discharging hose (5), and finally the oil layer is discharged through the oil discharging port (6).
11. A multiphase separation process in vacuum stripping according to claim 10, characterized in that it comprises a separation step of water and solid particles:
after the oil layer is completely discharged through the oil discharge port (6), a blow-down pipe (8) positioned at the bottom of the reaction kettle (12) is opened, and the water layer and the solid particle layer are discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210770412.8A CN117358738A (en) | 2022-06-30 | 2022-06-30 | Multiphase separation device and method in vacuum extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210770412.8A CN117358738A (en) | 2022-06-30 | 2022-06-30 | Multiphase separation device and method in vacuum extraction |
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