CN215279152U

CN215279152U - Supercritical fluid soil remediation system

Info

Publication number: CN215279152U
Application number: CN202120826834.3U
Authority: CN
Inventors: 陈林; 陈嘉祥; 冯永昌
Original assignee: Institute of Engineering Thermophysics of CAS
Current assignee: Institute of Engineering Thermophysics of CAS
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-12-24
Anticipated expiration: 2031-04-21

Abstract

The utility model provides a supercritical fluid soil repair system, the system includes: the supercritical fluid injection module is used for supplementing supercritical fluid into the system; the compression module is connected with the supercritical fluid injection module and is used for applying pressure to the supercritical fluid; the extraction module is connected with the compression module and is used for extracting the supercritical fluid and the soil to be repaired; and the separation module is connected with the extraction module and the supercritical fluid injection module and is used for separating the extracted supercritical fluid from pollutants, wherein the compression module comprises a compressor used for compressing the supercritical fluid. The utility model provides a supercritical fluid soil repair system has proposed a compressor driven supercritical fluid soil repair cycle mode on the basis of current supercritical soil repair technique, and the high-pressure pump that uses the plunger pump to represent among the solution prior art that can be better is difficult to satisfy large-traffic problem.

Description

Supercritical fluid soil remediation system

Technical Field

The utility model belongs to the environmental engineering field, concretely relates to supercritical fluid soil repair system.

Background

With the development of industry, pesticides, fertilizers, industrial sewage sludge, discharge of solid waste, exploitation of nuclear raw materials, and accumulation of pollutants in soil are major causes of soil pollution. Many pollutants can exist in soil for a long time, enter human biological chains through enrichment of plants and animals, and the polluted soil can cause secondary pollution of underground water and surface water, so that the human health is threatened and even the human survival is endangered, and therefore the induced soil remediation technology is a necessary means for solving the problems.

Soil remediation refers to the use of a means to transfer, absorb or transform a contaminant in the soil to reduce its concentration to an acceptable level. The soil remediation is divided into several modes such as physical remediation, chemical remediation and biological remediation, and specifically comprises steam extraction, flushing, incineration pyrolysis, extraction, oxidation reduction, landfill, in-situ biological remediation and the like. However, the above-mentioned technologies have many limitations in the development of industrialization due to the economical efficiency, the scale of treatment, the aging of treatment, the single type of treatment of pollutants or contaminated soil, and the like.

The supercritical fluid soil remediation is a soil remediation technology developed along with a supercritical fluid, and because the supercritical fluid has a series of excellent properties of density close to liquid, diffusion coefficient and viscosity close to gas, strong solubility, high mass transfer efficiency and the like, and in addition, the properties of the supercritical fluid, such as density, viscosity, diffusion coefficient, solvation capacity and the like, can be obviously changed due to slight temperature and pressure changes, and good separation characteristics are further realized, the supercritical fluid has the potential of solving a plurality of defects of the traditional soil remediation technology, and becomes a research hotspot in recent years.

The existing supercritical soil remediation technology mostly adopts a pump to convey supercritical fluid, and the supercritical fluid needs to be cooled, liquefied and heated for gasification repeatedly in the circulation process of a system, so that the energy consumption of the system is obviously increased, and the economical efficiency of the system is reduced. The extraction and separation temperatures used for different process subjects are different and there are a number of application scenarios where both extraction and separation temperatures are above the supercritical temperature, in which case the supercritical fluid does not need to be fluidized. In addition, large-scale application usually requires very high supercritical fluid flow, a high-pressure pump represented by a plunger pump in the traditional supercritical fluid soil remediation system is difficult to meet the application requirement of high flow, and the problem can be well solved by adopting a compressor.

Therefore, it is desirable to provide a supercritical fluid soil remediation system that reduces the energy consumption of the compression process while ensuring stable operation of the system.

Disclosure of Invention

In order to solve the above problems, the present invention provides a supercritical fluid soil remediation system, comprising: the supercritical fluid injection module is used for supplementing supercritical fluid into the system; the compression module is connected with the supercritical fluid injection module and is used for applying pressure to the supercritical fluid; the extraction module is connected with the compression module and is used for extracting the supercritical fluid and the soil to be repaired; and the separation module is connected with the extraction module and the supercritical fluid injection module and is used for separating the extracted supercritical fluid from pollutants, wherein the compression module comprises a compressor used for compressing the supercritical fluid.

The supercritical fluid soil remediation system provided by the present invention also has the feature that the compressor includes one or more selected from a centrifugal compressor, a piston compressor and a screw compressor.

The utility model provides a supercritical fluid soil remediation system still has such a characteristic, the compression module includes a plurality of sub-compression modules.

The utility model provides a supercritical fluid soil repair system still has such characteristic, the sub-compression module is including the suction valve, compressor and the discharge valve that connect gradually.

The utility model provides a supercritical fluid soil repair system still has such characteristic, parallel connection between the discharge valve of a plurality of sub-compression modules, the gas vent of the compressor of preceding sub-compression module is connected through intercooler with the suction valve entry of back sub-compression module among a plurality of sub-compression modules.

The utility model provides a supercritical fluid soil remediation system still has such characteristic, discharge valve with the extraction module is connected.

The utility model provides a supercritical fluid soil repair system still has such characteristic, supercritical fluid pours into the module including the supercritical fluid storage tank and the supercritical fluid buffer tank that connect gradually into, supercritical fluid storage tank is equipped with the supercritical fluid who is used for pouring into supercritical fluid fills notes mouth and supercritical fluid and fills the filling valve, be equipped with the supercritical fluid pump and the check valve that connect gradually between supercritical fluid storage tank and the supercritical fluid buffer tank.

The utility model provides a supercritical fluid soil remediation system still has such characteristic, supercritical fluid buffer tank includes first import, second import and export, first import with the exit linkage of check valve, the second import with separation module connects, the export with compression module connects.

The utility model provides a supercritical fluid soil repair system still has such characteristic, the extraction module is including the first temperature regulating device, smuggle secretly the agent and sneak into device and the soil prosthetic devices that connect in order.

The utility model provides a supercritical fluid soil remediation system still has such characteristic, the separation module is including the filter, relief pressure valve, second attemperator and the pollutant separator that connect gradually.

The utility model provides a supercritical fluid soil remediation system still has such characteristic, the pollutant separator includes separator import, the first export of separator and separator second export, the separator import with the second attemperator is connected, the first export of separator with supercritical fluid injection module connects, the export of separator second is used for discharging the pollutant that is separated out.

The supercritical fluid soil remediation system provided by the present invention also has such features, the system further comprises a contaminant collector, the contaminant collector with the separator second outlet connection.

Has the advantages that:

the utility model provides a supercritical fluid soil repair system has proposed a compressor driven supercritical fluid soil repair cycle mode on the basis of current supercritical soil repair technique, and the high-pressure pump that uses the plunger pump to represent among the solution prior art that can be better is difficult to satisfy large-traffic problem.

The utility model provides a supercritical fluid soil repair system has introduced the multistage compression mode in compression process, when guaranteeing system steady operation, reduces the compression process energy consumption, in addition, can also realize wide pressure ratio range through the switching of compression progression and adjust, to improving supercritical fluid soil repair system efficiency and economic nature, and then promote its industrialization and use, have important realistic meaning.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a supercritical fluid soil remediation system provided by the present invention;

FIG. 2 is a schematic view of a compression module of FIG. 1;

FIG. 3 is a schematic diagram of one of the sub-compression modules of FIG. 2;

fig. 4(a), fig. 4(b), and fig. 4(c) are schematic diagrams illustrating airflow directions of the compression module of the supercritical soil remediation system provided by the present invention under different working scenarios;

wherein: 1: a supercritical fluid fill port; 2: a supercritical fluid charging valve; 3: a supercritical fluid storage tank; 4: a supercritical fluid pump; 5: a check valve; 6: a supercritical fluid buffer tank; 7: a compression module; 71: a first sub-compression module; 711: a first air intake valve; 712: a first compressor; 713: a first exhaust valve; 72: a second sub-compression module; 720: a second intercooler; 721: a second suction valve; 722: a second compressor; 723: a second exhaust valve; 73: a third sub-compression module; 730: a third intercooler; 731: a third suction valve; 732: a third compressor; 733: a third exhaust valve; 7N: an Nth sub-compression module; 7N 0: an Nth intercooler; 7N 1: an Nth suction valve; 7N 2: an Nth compressor; 7N 3: an Nth exhaust valve; 8: a first temperature adjusting device; 9: an entrainer mixing device; 10: a soil remediation device; 11: a filter; 12: a pressure reducing valve; 13: a second temperature adjusting device; 14: a contaminant separator; 15: a pollutant collector.

Detailed Description

In order to make the technical means, creation features, achievement purposes and effects of the present invention easy to understand, the following embodiments are specifically illustrated in the following drawings.

In the description of the embodiments of the present invention, it should be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which is only for the convenience of description and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise specified, "a plurality" means two or more.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1, there is provided a supercritical fluid soil remediation system, the system comprising: the supercritical fluid injection module is used for supplementing supercritical fluid into the system; the compression module 7 is connected with the supercritical fluid injection module and is used for applying pressure to the supercritical fluid; the extraction module is connected with the compression module 7 and is used for extracting the supercritical fluid and the soil to be repaired; and a separation module connected to the extraction module and the supercritical fluid injection module, for separating the extracted supercritical fluid from the contaminants, wherein the compression module 7 includes a compressor for compressing the supercritical fluid. The compressor includes one or more selected from a centrifugal compressor, a piston compressor, and a screw compressor.

The working process is as follows: when the repairing condition is met, the supercritical fluid compression module 7 is started, the supercritical fluid stored in the supercritical fluid buffer tank in the supercritical fluid injection module is led out, the pressure is increased to the required pressure, extraction is carried out in the extraction module, the extracted mixture is separated through the separation module, liquid phase/solid phase pollutants are left at the bottom of the separation module, and the supercritical fluid after the pollutants are separated returns to the supercritical fluid injection module to complete the supercritical fluid soil repairing cycle.

The supercritical fluid soil remediation system provided by the embodiment provides a compressor-driven supercritical fluid soil remediation circulation mode on the basis of the existing supercritical soil remediation technology, and can better solve the problem that a high-pressure pump represented by a plunger pump is difficult to meet the requirement of large flow in the prior art.

In some embodiments, the compression module 7 comprises a plurality of sub-compression modules. The sub-compression module comprises a suction valve, a compressor and an exhaust valve which are connected in sequence. The exhaust valves of the sub-compression modules are connected in parallel, and the exhaust port of the compressor of the front sub-compression module in the sub-compression modules is connected with the inlet of the suction valve of the rear sub-compression module through an intercooler. The exhaust valve is connected with the extraction module. As shown in FIGS. 2-3, 71, 72, and 7N are the first sub-compression module, the second sub-compression module, and the Nth sub-compression module, respectively, where N is the number of the sub-compression modules, and N is greater than or equal to 1. The first sub-compression module 71 includes a first suction valve 711, a first compressor 712, and a first discharge valve 713, the second compression module 72 includes a second intercooler 720, a second suction valve 721, a second compressor 722, and a second discharge valve 723, and the nth sub-compression module 7N includes an nth intercooler 7N0, an nth suction valve 7N1, an nth compressor 7N2, and an nth discharge valve 7N 3.

As shown in fig. 4, taking a compression module including three stages of sub-compression modules as an example, the working principle of the compression module of the supercritical fluid soil remediation system will be described with respect to starting a single compressor, starting two compressors and starting all the compressors:

A. as shown in fig. 4(a), a single compressor is started.

When the pressure required for extraction is low, only a single compressor, i.e. the first sub-compression module 71, needs to be started. At this time, the second intercooler 720, the second suction valve 721, the second compressor 722, and the second discharge valve 723 of the second sub-compression module 72 and the third intercooler 730, the third suction valve 731, the third compressor 732, and the third discharge valve 733 of the third sub-compression module 73 are all closed; meanwhile, the first intake valve 711 and the first exhaust valve 713 of the first sub-compression module 71 are opened, and the first compressor 712 is turned on. The supercritical fluid in the supercritical fluid buffer tank 6 is drawn out, flows through the first intake valve 711, the first compressor 712, and the first exhaust valve 713 in this order, and is discharged to the first temperature control device 8.

B. As shown in fig. 4(b), two compressors are started.

When the extraction pressure is increased to cause that a single compressor can not meet the requirement, two compressors need to be started, namely the first sub-compression module 71 and the second sub-compression module 72 are started. At this time, the first exhaust valve 713 of the first sub-compression module 71 is closed, and the third intercooler 730, the third suction valve 731, the third compressor 732, and the third exhaust valve 733 of the third sub-compression module 73 are closed; meanwhile, the first suction valve 711 and the first compressor 712 of the first sub-compression module 71 are opened, and the second intercooler 720, the second suction valve 721, the second compressor 722, and the second discharge valve 723 of the second sub-compression module 72 are opened. The supercritical fluid in the supercritical fluid buffer tank 6 is drawn out and then flows through the first suction valve 711, the first compressor 712, the second intercooler 720, the second suction valve 721, the second compressor 722, and the second discharge valve 723 in this order, and is discharged to flow to the first temperature adjusting device 8.

C. As shown in fig. 4(c), all the compressors are started.

When the extraction pressure is high, all compressors need to be fully started. At this time, the first discharge valve 713 of the first sub-compression module 71 and the second discharge valve 723 of the second sub-compression module 72 are closed, and the remaining valves and devices are all opened. The supercritical fluid in the supercritical fluid buffer tank 6 is drawn out, flows through the first suction valve 711, the first compressor 712, the second intercooler 720, the second suction valve 721, the second compressor 722, the third intercooler 730, the third suction valve 731, the third compressor 732, and the third discharge valve 733 in this order, and is discharged to the first temperature control device 8.

In the embodiment, a multi-stage compression mode is introduced in the compression process, so that the energy consumption in the compression process is reduced while the stable operation of the system is ensured, in addition, the adjustment of a wide pressure ratio range can be realized through the switching of compression stages, and the method has important practical significance for improving the energy efficiency and the economical efficiency of the supercritical fluid soil remediation system and further promoting the industrial application of the supercritical fluid soil remediation system.

In some embodiments, the supercritical fluid injection module comprises a supercritical fluid storage tank 3 and a supercritical fluid buffer tank 6 which are connected in sequence, the supercritical fluid storage tank 6 is provided with a supercritical fluid injection port 1 and a supercritical fluid filling valve 2 for injecting a supercritical fluid, and a supercritical fluid pump 4 and a check valve 5 which are connected in sequence are arranged between the supercritical fluid storage tank 3 and the supercritical fluid buffer tank 6.

In the operation process of the system, the pressure in the supercritical fluid buffer tank 6 can be slowly reduced due to leakage and the like, when the pressure is reduced to a set value, the supercritical fluid pump 4 is opened, the supercritical fluid is filled through the check valve 5 until the pressure of the supercritical fluid buffer tank required by the system is met, and then the supercritical fluid pump 4 is closed. When the pressure or liquid level in the supercritical fluid storage tank 3 is lower than a set value, the supercritical fluid filling valve 2 is opened, the supercritical fluid is filled through the supercritical fluid filling port 1 until the pressure or liquid level of the supercritical fluid storage tank required by the system is met, and then the supercritical fluid filling valve 2 is closed.

In some embodiments, the supercritical fluid buffer tank 6 includes a first inlet connected to the outlet of the check valve 5, a second inlet connected to the separation module, and an outlet connected to the compression module 7.

In some embodiments, the extraction module comprises a first temperature regulating device 8, an entrainer mixing device 9 and a soil remediation device 10 connected in series.

In the above embodiment, the first temperature adjusting means 8 is used to adjust the supercritical fluid compressed to a desired pressure to a desired temperature; the supercritical fluid after pressurization and temperature regulation enters an entrainer mixing device 9 and is mixed with entrainer in a certain proportion; the supercritical fluid mixed with the entrainer enters the soil remediation device 10 to contact with the contaminated soil therein, so that the contaminants in the contaminated soil are extracted and dissolved in the supercritical fluid.

In some embodiments, the separation module comprises a filter 11, a pressure reducing valve 12, a second temperature regulating device 13 and a contaminant separator 14 connected in series. The contaminant separator 14 includes a separator inlet connected to the second thermostat, a separator first outlet connected to the supercritical fluid injection module, and a separator second outlet for discharging the separated contaminants. The system further comprises a pollutant trap 15, said pollutant trap 15 being connected to said second outlet of the separator.

In the above embodiment, after the supercritical fluid with the dissolved contaminants is filtered by the filter 11, the pressure of the supercritical fluid is reduced to the required separation pressure by the pressure reducing valve 12, and then the supercritical fluid is adjusted to the required separation temperature by the second temperature adjusting device 13; the supercritical fluid having the contaminant separation condition enters the contaminant separator 14, wherein the liquid/solid phase contaminants remain at the bottom of the contaminant separator 14, and then enters the contaminant collector 15; and returning the supercritical fluid after separating the pollutants to the supercritical fluid buffer tank 6 to finish the soil remediation cycle of the supercritical fluid.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A supercritical fluid soil remediation system, the system comprising:

the supercritical fluid injection module is used for supplementing supercritical fluid into the system;

the compression module is connected with the supercritical fluid injection module and is used for applying pressure to the supercritical fluid;

the extraction module is connected with the compression module and is used for extracting the supercritical fluid and the soil to be repaired;

the separation module is connected with the extraction module and the supercritical fluid injection module and is used for separating the extracted supercritical fluid from pollutants;

wherein the compression module comprises a compressor for compressing the supercritical fluid.

2. The supercritical fluid soil remediation system of claim 1 wherein the compressor comprises one or more selected from a centrifugal compressor, a piston compressor, and a screw compressor.

3. The supercritical fluid soil remediation system of claim 1 wherein the compression module comprises a plurality of sub-compression modules.

4. The supercritical fluid soil remediation system of claim 3 wherein the sub-compression module comprises a suction valve, a compressor and a discharge valve connected in series.

5. The supercritical fluid soil remediation system of claim 4 wherein the exhaust valves of the sub-compression modules are connected in parallel, and wherein the exhaust port of the compressor of a front sub-compression module of the sub-compression modules is connected to the intake valve inlet of a rear sub-compression module of the sub-compression modules by an intercooler.

6. The supercritical fluid soil remediation system of claim 5 wherein the vent valve is coupled to the extraction module.

7. The supercritical fluid soil remediation system of claim 1 wherein the supercritical fluid injection module comprises a supercritical fluid storage tank and a supercritical fluid buffer tank which are connected in sequence, the supercritical fluid storage tank is provided with a supercritical fluid injection port and a supercritical fluid filling valve for injecting supercritical fluid, and a supercritical fluid pump and a check valve which are connected in sequence are arranged between the supercritical fluid storage tank and the supercritical fluid buffer tank.

8. The supercritical fluid soil remediation system of claim 7 wherein the supercritical fluid surge tank comprises a first inlet connected to the outlet of the check valve, a second inlet connected to the separation module, and an outlet connected to the compression module.

9. The supercritical fluid soil remediation system of claim 1 wherein the extraction module comprises a first temperature conditioning device, an entrainer incorporation device, and a soil remediation device connected in series.

10. The supercritical fluid soil remediation system of claim 1 wherein the separation module comprises a filter, a pressure relief valve, a second temperature regulating device, and a contaminant separator connected in series.

11. The supercritical fluid soil remediation system of claim 10 wherein the contaminant separator comprises a separator inlet, a separator first outlet and a separator second outlet, the separator inlet being connected to the second attemperating device, the separator first outlet being connected to the supercritical fluid injection module, the separator second outlet being configured to discharge the separated contaminants.