CN115072819B - Intelligent electrode well control system and repair system for in-situ thermal desorption-electrocatalytic oxidation - Google Patents
Intelligent electrode well control system and repair system for in-situ thermal desorption-electrocatalytic oxidation Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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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
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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- C02F2201/46125—Electrical variables
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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- C02F2201/46145—Fluid flow
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
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Abstract
The invention discloses an intelligent control system and a repair system of an electrode well for in-situ thermal desorption-electrocatalytic oxidation, wherein special electrodes capable of realizing in-situ thermal desorption and electrocatalytic oxidation are distributed in the electrode well and are respectively connected with an SCR alternating current voltage regulating unit and a bidirectional direct current pulse unit through a circuit switching unit; when the electrode well works as an in-situ thermal desorption mode, the control circuit switching unit is switched to the SCR alternating current voltage regulating unit, and when the on-site monitoring temperature delta t meets the following conditions: t is t 0 ≤Δt＜t 1 Constant power output of the SCR alternating current voltage regulating unit; t is t 1 ≤Δt＜t 2 Constant voltage output; when the electrode well works as an electrocatalytic oxidation mode, the control circuit switching unit is switched to the bidirectional direct current pulse unit and outputs constant voltage. The invention can meet the stable operation of the electrode well under the two use conditions of resistance heating and electrocatalytic oxidation by improving the design of the power supply unit, and provides a larger space for the selection and optimization of the technical process.
Description
Technical Field
The invention relates to the technical field of in-situ remediation, in particular to an electrode well intelligent control system and a remediation system for in-situ thermal desorption-electrocatalytic oxidation, which are suitable for remediation of organic contaminated soil and underground water.
Background
The in-situ thermal desorption technology has good applicability to the remediation of the soil and groundwater polluted by VOCs and SVOCs. The in-situ resistance heating technology adopts an alternating current power supply system, takes an electrode well as a phase electrode, and realizes heating by utilizing the electrothermal effect of soil and underground water. Electrocatalytic oxidation technology is widely used in the field of sewage treatment as an advanced oxidation technology, and direct current is needed as a power supply.
The in-situ thermal desorption technology is used as a soil and underground water treatment technology, has high efficiency and thorough treatment degree, but under the carbon emission reduction background, the relatively high energy consumption also affects one of factors of technology selection; electrocatalytic oxidation technology has not been used in the soil and groundwater fields before, and design and construction costs face many challenges.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an electrode well intelligent control system and a repair system for in-situ thermal desorption-electrocatalytic oxidation.
The invention discloses an intelligent control system of an electrode well for in-situ thermal desorption-electrocatalytic oxidation, which comprises the following components: an electrode well and an intelligent control unit;
special electrodes capable of realizing in-situ thermal desorption and electrocatalytic oxidation are distributed in the electrode wells, and the special electrodes are respectively connected with an SCR alternating current voltage regulating unit and a bidirectional direct current pulse unit through a circuit switching unit; the intelligent control unit is respectively connected with the special electrode, the circuit switching unit, the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit;
when the electrode well works as an in-situ thermal desorption mode, the intelligent control unit controls the circuit switching unit to switch to the SCR alternating current voltage regulating unit, and when the on-site monitoring temperature delta t meets the following conditions: t is t 0 ≤Δt＜t 1 The intelligent control unit controls constant power output of the SCR alternating current voltage regulating unit; when the on-site monitoring temperature deltat meets the following conditions: t is t 1 ≤Δt＜t 2 The intelligent control unit controls constant voltage output of the SCR alternating current voltage regulating unit; wherein t is 0 To restore the initial temperature of the site, t 1 To actually measure the temperature corresponding to the deviation value of the field resistance and the initial field resistance is larger than a first threshold value, t 2 A set temperature when the heating mode is stopped;
when the electrode well works as an electrocatalytic oxidation mode, the intelligent control unit controls the circuit switching unit to switch to the bidirectional direct current pulse unit, and the intelligent control unit controls constant voltage output of the bidirectional direct current pulse unit.
As a further improvement of the invention, the SCR ac voltage regulation unit comprises measuring instruments for measuring the current, voltage, power, temperature and pressure of the repair site.
As a further improvement of the invention, t 1 The determining method of (1) comprises the following steps:
collecting undisturbed soil of a stratum i according to a geological survey report; determination of resistivity ρ of undisturbed soil of each formation at different temperatures it The method comprises the steps of carrying out a first treatment on the surface of the At temperature t, inter-well resistance R t And the thickness L of each stratum i And resistivity ρ it The relation of (2) is:
as the heating process proceeds, the temperature t 1 Time-well resistor R t1 And an initial temperature t 0 Interwell resistance R at the time t0 The ratio is as follows:
according to the current and voltage data in the heating process, real-time monitoring is carried out
When the deviation of the two is more than 10%, the temperature t is marked at the moment 1 。
As a further improvement of the invention, when the SCR alternating current voltage regulating unit outputs constant power, the power P is output 1 Constant and adjustable in 0-500kVA, I 1 For the in-situ detection value as an independent variable, U 1 Setting voltage as an adjustment amount;
when the constant voltage of the SCR alternating current voltage regulating unit is output, the output voltage U 2 Constant and adjustable at 0-1000V, I 2 For the field detection value as an independent variable, P 2 Setting power as an adjustment amount;
when the constant voltage of the bidirectional direct current pulse unit is output, the output voltage U 3 Constant and adjustable at 0-24V, I 3 For the field detection value as an independent variable, t 3 And setting forward and reverse working time as an adjustment quantity.
As a further improvement of the present invention, the special electrode includes: an aluminum alloy row;
the aluminum alloy row is provided with opposite clamping graphite electrode plates at intervals along the height direction, the graphite electrode plates are detachably fixed with the aluminum alloy row through opposite clamping bolts, and the surface of a non-heating area of the aluminum alloy row is coated with an insulating sheath.
As a further improvement of the present invention, the electrode well includes: a well body;
the special electrode is arranged in the well body, the graphite electrode plates are arranged in the plane where the pollution areas are located, quartz sand and conductive liquid are filled in the plane where the corresponding pollution areas are located in the well body, and bentonite is filled in the plane where the corresponding pollution-free areas are located.
The invention also discloses an in-situ remediation system for the organic contaminated soil and the underground water, which comprises the following steps: extraction well, vapor extraction component, liquid extraction component and intelligent control system of electrode well;
the electrode well and the extraction well are arranged in a preset area of organic polluted soil and underground water;
the extraction well is respectively connected with a vapor extraction assembly and a liquid extraction assembly, the vapor extraction assembly comprises a vacuum pump, an atomization spraying unit, a steam-water separator and a tail gas treatment unit which are sequentially connected, and the liquid extraction assembly comprises an extraction pump, a mass flowmeter, a condenser, a three-phase separator and a sewage treatment unit which are sequentially connected; the liquid outlet of the steam-water separator is connected with the liquid inlet of the condenser, the gas outlet of the three-phase separator is connected with the gas inlet of the tail gas treatment unit, and the oil outlet of the three-phase separator and the oil outlet of the tail gas treatment unit are both connected to the storage tank.
As a further improvement of the invention, the intelligent control unit is also connected with one or more of the vacuum pump, the atomizing spray unit, the steam-water separator, the tail gas treatment unit, the extraction pump, the mass flowmeter, the condenser, the three-phase separator, the sewage treatment unit and the storage tank, and is used for realizing intelligent control of in-situ thermal desorption and electrocatalytic oxidation.
Compared with the prior art, the invention has the beneficial effects that:
the invention ensures that the electrode well can stably work under two use conditions of resistance heating and electrocatalytic oxidation by improving the design of the electrode well power supply unit, and provides a larger space for the selection and optimization of the technical process.
Drawings
FIG. 1 is a schematic diagram of an in situ remediation system for organically-contaminated soil and groundwater according to one embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of an electrode according to an embodiment of the present invention; wherein a is a front view; b is a side view;
FIG. 3 is a schematic view of an electrode well according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a three-phase separator according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an in-situ thermal desorption-electrocatalytic oxidation intelligent electrode well control system according to an embodiment of the present invention.
In the figure:
1. an electrode well; 2. an extraction well; 3. a circuit switching unit; 4. an SCR alternating current voltage regulating unit; 5. a bidirectional DC pulse unit; 6. an intelligent control unit; 7. a vacuum pump; 8. an atomization spraying unit; 9. a steam-water separator; 10. a tail gas treatment unit; 11. an extraction pump; 12. a mass flowmeter; 13. a condenser; 14. a three-phase separator; 15. a sewage treatment unit; 16. a storage tank; 17. a power supply device;
1-1, a special electrode; 1-1-1, aluminum alloy rows; 1-1-2 parts of graphite electrode plate; 1-1-3, a butt clamp bolt; 1-1-4, aluminum row connecting holes; 1-1-5, insulating sheath; 1-2, a non-contaminated area; 1-3, contaminated areas; 1-4, a well body; 1-5 parts of bentonite; 1-6, quartz sand and conductive liquid; 1-7, an injection tube;
14-1, a sand baffle; 14-2, a sand discharge valve; 14-3, a water regulating valve; 14-4, a heavy component regulating valve; 14-5, an oil baffle plate; 14-6, a pressure regulating valve; 14-7, a demister; 14-8, a pontoon liquid level gauge; 14-9, a temperature sensor; 14-10 parts of a water tank; 14-11, a grit chamber; 14-12, a shell.
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 is described in further detail below with reference to the attached drawing figures:
as shown in fig. 5, the present invention provides an electrode well intelligent control system for in-situ thermal desorption-electrocatalytic oxidation, comprising: the electrode well 1, the circuit switching unit 3, the SCR alternating current voltage regulating unit 4, the bidirectional direct current pulse unit 5 and the intelligent control unit 6; wherein,
the electrode well 1 is internally provided with a special electrode 1-1 capable of realizing in-situ thermal desorption and electrocatalytic oxidation, the special electrode is respectively connected with an SCR alternating current voltage regulating unit 4 and a bidirectional direct current pulse unit 5 through a circuit switching unit 3, and the SCR alternating current voltage regulating unit 4 and the bidirectional direct current pulse unit 5 are respectively connected with a power supply device 17 (mains supply); the intelligent control unit 6 is respectively connected with the special electrode 1-1, the circuit switching unit 3, the SCR alternating current voltage regulating unit 4 and the bidirectional direct current pulse unit 5; specific:
when the electrode well 1 works as an in-situ thermal desorption mode, the intelligent control unit 6 controls the circuit switching unit 3 to switch to the SCR alternating current voltage regulating unit 4, the SCR alternating current voltage regulating unit 4 starts to work, alternating current is supplied to the electrode well 1, and the soil and underground water serving as conductors are heated based on current thermal efficiency; during the heating process, when the site temperature deltat is monitored on site to meet the following conditions: t is t 0 ≤Δt＜t 1 The intelligent control unit 6 controls the constant power output of the SCR alternating current voltage regulating unit 4; when the on-site monitoring temperature deltat meets the following conditions: t is t 1 ≤Δt＜t 2 The intelligent control unit 6 controls the constant voltage output of the SCR alternating current voltage regulating unit 4; wherein t is 0 To restore the initial temperature of the site, t 1 To actually measure the temperature corresponding to the deviation value of the field resistance and the initial field resistance is larger than a first threshold value, t 2 Is the set temperature when the heating mode is stopped.
On the basis of the scheme, the SCR alternating current voltage regulating unit 4 comprises a measuring instrument which is used for measuring parameters such as current, voltage, power, temperature and pressure of a repair site and providing linkage protection; the SCR unit of the SCR alternating current voltage regulating unit 4 is overlapped by adopting an SCR module, the front end is provided with a fast melting protection, and the cooling mode is water cooling; the power supply of the SCR alternating current voltage regulating unit 4 is an isolated power supply, and 4 voltage classes are provided according to the system requirements.
On the basis of the scheme, t of the invention 1 The determining method for the temperature corresponding to the deviation value of the actual field resistance and the initial field resistance is more than 10 percent comprises the following steps:
collecting undisturbed soil of a stratum i according to a geological survey report; determination of resistivity ρ of undisturbed soil of each formation at different temperatures it The method comprises the steps of carrying out a first treatment on the surface of the At temperature t, inter-well resistance R t And the thickness L of each stratum i And resistivity ρ it The relation of (2) is:
as the heating process proceeds, the temperature t 1 Time-well resistor R t1 And an initial temperature t 0 Interwell resistance R at the time t0 The ratio is as follows:
according to the current and voltage data in the heating process, real-time monitoring is carried out
When the deviation of the two is more than 10%, the temperature t is marked at the moment 1 。
Based on the scheme, when the SCR alternating current voltage regulating unit 4 outputs constant power, the power P is output 1 Constant and adjustable in 0-500kVA, I 1 For the in-situ detection value as an independent variable, U 1 In order to set voltage as an adjustment quantity, the energy is input into the first stage, and the temperature is quickly raised; when the constant voltage of the SCR alternating current voltage regulating unit 4 is output, the output voltage U 2 Constant and adjustable at 0-1000V, I 2 For the field detection value as an independent variable, P 2 In order to set power as an adjustment amount, the second stage energy input stage protects the electrode well from damage and the temperature rises steadily.
When the electrode well 1 of the present invention is operated as an electrocatalytic oxidation mode, when t 2 And the thermal desorption mode of the SCR alternating current voltage regulating unit 4 is not more than deltat, the circuit switching unit 3 is controlled by the intelligent control unit 6 to be switched to the bidirectional direct current pulse unit 5, the system enters an electrocatalytic oxidation mode, and a high-frequency power electronic conversion technology is adopted to output pulses. The intelligent control unit 6 controls the constant voltage output of the bidirectional direct current pulse unit 5.
On the basis of the scheme, the bidirectional direct current pulse unit 5 consists of a control circuit, a human-computer interface and a bidirectional pulse adjustable power supply, wherein the human-computer interface is a touch screen, has a configuration function, displays running pictures, and realizes manual operation and program automatic control; in the running process of the system, the electrocatalytic oxidation environment is unstable due to the change of moisture, pollutant ions, temperature and the like in the soil, and the system adopts constant-pressure control, namely, the output voltage U 3 Constant and adjustable at 0-24V, I 3 For the field detection value as an independent variable, t 3 The forward and reverse working time is set as the adjustment quantity, and the forward and reverse pulses with different amplitudes meeting the system operation requirement can be obtained. The input end of the bidirectional pulse adjustable power supply is power frequency alternating current, and the output is bidirectional direct current pulse and can be controlled by a program; the input power frequency alternating current generates bidirectional direct current pulse through a direct current converter, and a rectifier in the converter adjusts unstable current and corrects input power factors.
Based on the scheme, the intelligent control unit 6 adopts a PLC control system, and the intelligent control unit 6 is combined with a special electrode well to realize the combination of the original flavor thermal desorption heating process and the in-situ electrocatalytic oxidation treatment process or the two processes in the polluted site.
As shown in fig. 2, the special electrode 1-1 of the present invention includes: 1-1-1 of aluminum alloy row, 1-1-2 of graphite electrode plate, 1-1-3 of butt clamp bolt and 1-1-5 of insulating sheath; the aluminum alloy row 1-1 is provided with opposite clamping graphite electrode plates 1-1-2 at intervals along the height direction, corresponding positions on the aluminum alloy row 1-1-1 are provided with aluminum row connecting holes 1-1-4, the graphite electrode plates 1-1-2 pass through the corresponding aluminum row connecting holes 1-1-4 through opposite clamping bolts to realize detachable fixation with the aluminum alloy row 1-1-1, and the non-heating area surface of the aluminum alloy row 1-1 is coated with an insulating sheath 1-1-5.
Further, the aluminum alloy row 1-1-1 has the characteristics of low density and high strength, and has excellent conductivity of 2.2 multiplied by 10 -8 Ω m, thermal conductivity and corrosion resistance, tensile ductility; compared with the common copper column electrode, the aluminum alloy row 1-1-1 has lower density, so that the aluminum alloy row is lighter in weight and smaller in longitudinal stress, and can effectively resist stress deformation caused by soil heating. The high-power graphite electrode plate 1-1-2 is customized to have the conductivity not lower than 25A/cm 2 The surface is coated with an oxidation-resistant protective layer, and has the characteristics of light weight, corrosion resistance, high temperature resistance and the like.
Further, according to the type and concentration of pollutants, the heating power of soil in unit volume is calculated, and the area of the graphite electrode plate 1-1-2 used for the length of the aluminum alloy row is designed, so that the gap size of the graphite electrode plate 1-1-2 on the aluminum alloy row 1-1-1 is adjusted, and the gap is protected by a high-temperature insulating sheath 1-1-5; meanwhile, the multi-section aluminum alloy rows can be connected through bolts according to the depth of the well, and only the aluminum rows are reserved for the stratum which does not need to be heated to be used as the framework to wrap the high-temperature insulating sheath 1-1-5. Furthermore, the special electrode is used for being installed in soil, the alternating current voltage AC is 30-600V, and the direct current pulse voltage DC is 0-100V; preferably, the width of the aluminum alloy row is 100cm and the thickness is 6cm, and the width of the graphite electrode plate is 200cm and the thickness is 10cm.
On the basis of the scheme, as shown in FIG. 3, the electrode well comprises a well body 1-4, a special electrode 1-1 is arranged in the well body 1-4, and a graphite electrode plate 1-1-2 is arranged in a plane where a pollution area 1-3 is located; meanwhile, quartz sand and conductive liquid 1-6 are filled in the planes of the pollution areas 1-3 with different depths corresponding to the well body 1-4, and bentonite 1-5 is filled in the planes of the pollution-free areas 1-2 with different depths corresponding to the well body 1-4.
Furthermore, when the special electrode 1-1 is used as a heating electrode and a high-grade oxidation electrode, carbon powder is released, and the carbon powder is gradually dispersed in the peripheral heating soil, so that the conductivity is increased, and the heating and oxidation effects are enhanced; meanwhile, if the conductivity cannot meet the requirement, carbon-containing powder conductive liquid can be supplemented into the polluted soil and the underground water through the injection pipes 1-7. Meanwhile, the invention can also supplement water to the special electrode well through the injection pipe 1-7 according to the water extraction amount of the extraction well, so as to maintain the groundwater level.
As shown in fig. 1, the present invention provides an in-situ remediation system for organically contaminated soil and groundwater, which includes, in addition to the above-described electrode well structure designed and constructed according to site geological features and contamination conditions: extraction wells 2 and monitoring wells (not shown) designed and constructed according to site geological features and pollution conditions; wherein,
the multiphase extraction well 2 is respectively connected with a vapor extraction component and a liquid extraction component, the vapor extraction component comprises a vacuum pump 7, an atomization spraying unit 8, a steam-water separator 9 and a tail gas treatment unit 10 which are sequentially connected, and the liquid extraction component comprises an extraction pump 11, a mass flowmeter 12, a condenser 13, a three-phase separator 14 and a sewage treatment unit 15 which are sequentially connected; wherein, the liquid outlet of vapour-water separator 9 connects the inlet of condenser 13, and the gas outlet of three-phase separator 14 connects the air inlet of tail gas treatment unit 10, and the oil-out of three-phase separator 14 and the oil-out of tail gas treatment unit 10 all are connected to storage tank 16.
The specific extraction method comprises the following steps: the vapor extraction extracts vapor from the extraction well 2, enters a vapor-water separator 9 through a vacuum pump 7 and an atomization spraying unit 8, and enters a tail gas treatment unit 10 after liquid phase is separated and removed through the vapor-water separator 9, so that standard emission is achieved after treatment; liquid phase extraction extracts liquid phase from the extraction well 2, the liquid phase separated by the steam-water separator 9 after passing through the extraction pump 11 and the mass flowmeter 12 enters the condenser 13 together, and then three-phase separation is carried out by the three-phase separator 14; the separated gas phase enters the tail gas treatment unit 10 for treatment, the separated heavy component oil phase and the heavy component oil phase collected by the tail gas treatment unit 10 simultaneously enter the storage tank 16 for collection and centralized treatment, and the separated water phase enters the sewage treatment unit 15 for treatment.
On the basis of the scheme, as shown in FIG. 4, the three-phase separator 14 of the invention comprises a sand baffle 14-1, a sand discharge valve 14-2, a water regulating valve 14-3, a heavy component regulating valve 14-4, an oil baffle 14-5, a pressure regulating valve 14-6, a demister 14-7, a pontoon level gauge 14-8, a temperature sensor 14-9, a water tank 14-10, a sand basin 14-11 and a shell 14-12; wherein, a sand baffle 14-1 is arranged in the shell 14-12 near the liquid inlet, a sand discharge valve 14-2 is arranged on a sand discharge pipe at the bottom of a sand basin 14-11 formed by the sand baffle 14-1 and the inner wall of the shell, and when sand is piled up to a certain height, the sand discharge valve 14-2 is opened to discharge sand; a water tank 14-10 and an oil baffle 14-5 are sequentially arranged in the shell 14-12 at the downstream of the sand baffle 14-1, a water regulating valve 14-3 is arranged on a drain pipe at the bottom of the water tank 14-10, and a heavy component regulating valve 14-4 is arranged on an oil outlet pipe at the bottom of an oil outlet pool formed by the oil baffle 14-5 and the inner wall of the shell; the top of the shell 14-12 is provided with a demister 14-7, and an air outlet pipe connected with the demister 14-7 is provided with a pressure regulating valve 14-6; meanwhile, the shell 14-12 is also provided with a pontoon level meter 14-8 and a temperature sensor 14-9 for detecting the water phase and oil phase levels and temperatures.
When the three-phase separator 14 is used, water layered up and down in the shell 14-12 enters the water tank 14-10 and is connected with the sewage treatment unit 15 through a drain pipe; heavy oil vertically layered in the shell 14-12 enters an oil outlet tank and is connected with a storage tank 16 through an oil outlet pipe; the gas generated by three-phase separation in the shell passes through the demister 14-7 and then enters the tail gas treatment unit 10 through the gas outlet pipe.
Based on the above scheme, the mass flowmeter 12 of the invention can monitor the flow rate and the density temperature of fluid, the mass flowmeter 12 is provided with a driving coil, two ends of the mass flowmeter are provided with detection coils, when the exciting voltage provided by a transmitter is applied to the driving coil, the vibrating tube vibrates in a reciprocating cycle, fluid medium in the working process flows through the vibrating tube of the sensor, so that coriolis force effect can be generated on the vibrating tube to enable the two vibrating tubes to vibrate in a twisting way, the detection coils arranged at two ends of the vibrating tube generate two groups of signals with different phases, and the phase difference of the two signals is in proportional relation with the mass flow rate of the fluid flowing through the sensor. Calculating the mass flow through the vibrating tube by a computer; meanwhile, when different media flow through the sensor, the main vibration frequencies of the vibration tube are different, and the density of the media is calculated according to the main vibration frequencies. The platinum resistor mounted on the sensor vibrating tube can indirectly measure the temperature of the medium.
The technical requirements of the mass flowmeter are as follows:
mass flow accuracy ± 0.002 x flow ± zero drift;
density measurement accuracy +/0.003 g/cm 3 ；
The density measuring range is 0.5-1.5 g/cm 3 。
In order to realize the intelligent control of the repairing process, the intelligent control unit 6 of the invention is also connected with one or more of a vacuum pump 7, an atomization spraying unit 8, a steam-water separator 9, a tail gas treatment unit 10, an extraction pump 11, a mass flowmeter 12, a condenser 13, a three-phase separator 14, a sewage treatment unit 15 and a storage tank 16.
Further, in the three-phase separator 14, the pontoon level gauge 14-8 and the temperature sensor 14-9 are connected to the input terminal of the intelligent control unit 6, and the water regulating valve 14-3 and the heavy component regulating valve 14-4 are connected to the output terminal of the intelligent control unit 6.
The intelligent control unit 6 of the present invention may further comprise:
based on the detected parameters (parameters such as mass flow rate, density, temperature and the like) of the mass flowmeter 12, the working parameters (parameters such as whether to start, when to start, working time, intermittent time and the like) of each device of the vapor extraction component and the liquid extraction component are intelligently controlled; for example:
(1) when liquid phase extraction is performed, the extraction pump 11, the mass flowmeter 12, the condenser 13, the three-phase separator 14, the sewage treatment unit 15 and the storage tank 16 are controlled to be started; meanwhile, in the liquid phase extraction process, the extraction pump is controlled to perform stepwise intermittent operation based on the change of the liquid phase temperature and the density;
(2) when the thermal desorption temperature reaches the set temperature (40 ℃), the vacuum pump 7, the atomizing spray unit 8, the steam-water separator 9 and the tail gas treatment unit 10 are controlled to be started for gas phase extraction.
(3) Based on different heavy component oil phases, adjusting working parameters of equipment such as a condenser 13 and the like;
(4) based on the liquid level and temperature detected by the pontoon level gauge 14-8 and the temperature sensor 14-9, the flow rate adjustment of the water-adjusting valve 14-3 and the heavy-component-adjusting valve 14-4 is intelligently controlled.
The invention provides a method for repairing organic contaminated soil and underground water based on the in-situ repairing system, which comprises the following steps:
step 1, according to the detection value of the density of the solution in the multiphase extraction well 2, adjusting the depth of an inlet of an extraction pipe, controlling the extraction time, and only extracting target pollutant liquid;
and 4, after the in-situ thermal desorption is finished (for example, when the content of soil pollutants is within 10 times of the restoration target), the circuit switching unit 3 is switched to the bidirectional direct current pulse unit 5, forward and reverse direct current pulse voltage is applied to the electrode well 1, and high-density full-coverage electric field is applied to the restoration area to perform electrocatalytic oxidation.
Examples:
the nitrobenzene soil content of a certain polluted land block is 350mg/kg on average, the restoration target is 4.46mg/kg, the 4-chloroaniline is 1200mg/kg, the restoration target is 38mg/kg, and the pollution depth is 20 meters.
Nitrobenzene as target pollutant: a relative density of 1.205 (15/4 ℃), a melting point of 5.7 ℃, a boiling point of 210.9 ℃, a colorless or pale yellow (nitrogen dioxide impurity-containing) oily liquid;
the target pollutant 4-chloroaniline has relative density of 1.43, melting point of 72.5 deg.c and boiling point of 232 deg.c, and is white or pale yellow crystal dissolved in hot water.
The field geological structure is a mixed filling layer, a clay layer and a silt layer, because each section has different resistivity, 3 sections of well construction are adopted, special electrodes are ordered according to the density of a pollution range, the aluminum row among the three sections is connected with a thermal shrinkage sleeve for insulation, the electrodes are isolated by quartz sand and bentonite, and the electrodes are subjected to multiphase extraction and layered arrangement.
The method for restoring the composite pollution of nitrobenzene and 4-chloroaniline comprises the following steps:
step 1, well construction and installation and debugging of various devices;
TABLE 1
| Temperature (DEG C) | Density setting g/cm 3 | Density detection value > set value | Density detection value<Setting value |
| 20 | 1.18 | Pump extraction operation | Standing for 30min |
| 25 | 1.15 | Pump extraction operation | Standing for 45 min |
| 30 | 1.12 | Pump extraction operation | Standing for 110 min |
| 35 | 1.1 | Pump extraction operation | Standing for 120min |
| 40 | 1.07 | Pump extraction operation | Standing for 150min |
| 45 | 1.05 | Pump extraction operation | Standing for 180 min |
The water inlet of the extraction pipeline is arranged at the bottom of the multiphase extraction well 2, the medium with high density can be preferentially extracted, the mass flowmeter 12 can detect the temperature and the density of extracted liquid in real time, the intelligent control unit 6 can compare the detection value of the mass flowmeter 12 with the detection value of the table 1, the operation of the extraction pump 11 is automatically controlled, and the standing time is reserved for underground water; after each standing is completed, the extraction pump is started to run for at least 10min;
And 5, according to the physical characteristics of the 4-chloroaniline, the extraction process of the 4-chloroaniline is as follows:
continuously applying alternating current to the special electrode 1-1 to heat the soil and the underground water in situ, heating the soil and the underground water to 60 ℃, dissolving 4-chloroaniline in hot water at the moment, and then extracting; when the detected relative density is more than 1.2, continuously extracting, and standing for 30min, and then starting the cyclic extraction for at least 10min; heating to 65deg.C, detecting relative density greater than 1.1, continuously extracting, and circularly extracting with relative density less than 1.1, and standing for 60min; heating to 70deg.C, detecting relative density greater than 1.05, continuously extracting, detecting relative density less than 1.05, starting cyclic extraction, and standing for 120min; maintaining the temperature after heating to 75deg.C, extracting to obtain liquid phase with relative density greater than 1.0, continuously extracting to obtain liquid phase with relative density less than 1.0, starting cyclic extraction, extracting for 30min each time, and standing for 150min; until the relative density of the extract reaches 0.98, the continuous circulation extraction is maintained for 15 days.
Further, when the 4-chloroaniline solution was treated, the temperature was controlled at 65℃by a condenser. Too low a temperature can crystallize to block the pipeline, and too high a temperature is unfavorable for layered sedimentation; meanwhile, the interface between the heavy component and the water outlet regulating valve is kept constant.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An intelligent electrode well control system for in-situ thermal desorption-electrocatalytic oxidation, comprising: an electrode well and an intelligent control unit;
special electrodes capable of realizing in-situ thermal desorption and electrocatalytic oxidation are distributed in the electrode wells, and the special electrodes are respectively connected with an SCR alternating current voltage regulating unit and a bidirectional direct current pulse unit through a circuit switching unit; the intelligent control unit is respectively connected with the special electrode, the circuit switching unit, the SCR alternating current voltage regulating unit and the bidirectional direct current pulse unit; wherein, the special electrode includes: an aluminum alloy row; the aluminum alloy row is provided with opposite clamping graphite electrode plates at intervals along the height direction, the graphite electrode plates are detachably fixed with the aluminum alloy row through opposite clamping bolts, and the non-heating area surface of the aluminum alloy row is coated with an insulating sheath;
when the electrode well works as an in-situ thermal desorption mode, the intelligent control unit controls the circuit switching unit to switch to the SCR alternating current voltage regulating unit, and when the temperature is monitored on siteΔtThe method meets the following conditions:t 0 ≤Δt＜t 1 the intelligent control unit controls constant power output of the SCR alternating current voltage regulating unit; when monitoring temperature in situΔtThe method meets the following conditions:t 1 ≤Δt＜t 2 the intelligent control unit controls constant voltage output of the SCR alternating current voltage regulating unit; wherein,t 0 in order to restore the original temperature of the site,t 1 in order to measure the temperature corresponding to the deviation value of the field resistance and the initial field resistance is larger than the first threshold value,t 2 a set temperature when the heating mode is stopped; wherein,t 1 the determining method of (1) comprises the following steps: collecting stratum according to a geological survey reportiIs the undisturbed soil of (2); measuring resistivity of undisturbed soil of each stratum at different temperaturesρ it The method comprises the steps of carrying out a first treatment on the surface of the At the temperature oftDownhole inter-well resistanceR t And the thickness of each stratumL i And resistivity ofρ it The relation of (2) is:
as the heating process proceeds, the temperaturet 1 Time-well resistor R t1 And the initial temperaturet 0 Interwell resistance at timeR t0 The ratio is as follows:
according to the current and voltage data in the heating process, real-time monitoring is carried out
When the deviation between the two is more than 10%, the temperature is marked at the momentt 1 ；
When the electrode well works as an electrocatalytic oxidation mode, the intelligent control unit controls the circuit switching unit to switch to the bidirectional direct current pulse unit, and the intelligent control unit controls constant voltage output of the bidirectional direct current pulse unit.
2. The electrode well intelligent control system of claim 1, wherein the SCR ac voltage regulator unit comprises a measurement meter for measuring current, voltage, power, temperature and pressure at the repair site.
3. The intelligent control system of the electrode well according to claim 1, wherein the SCR ac voltage regulating unit outputs power at constant power outputP 1 Constant and adjustable in the range of 0-500kVA,I 1 for the field test value to be an independent variable,U 1 setting voltage as an adjustment amount;
when the constant voltage of the SCR alternating current voltage regulating unit is output, the output voltageU 2 Is constant and is adjustable in the range of 0-1000V,I 2 for the field test value to be an independent variable,P 2 setting power as an adjustment amount;
when the constant voltage of the bidirectional direct current pulse unit is output, the output voltageU 3 Is constant and is adjustable by 0-24V,I 3 for the field test value to be an independent variable,t 3 and setting forward and reverse working time as an adjustment quantity.
4. The electrode well intelligent control system of claim 1, wherein the electrode well comprises: a well body;
the special electrode is arranged in the well body, the graphite electrode plates are arranged in the plane where the pollution areas are located, quartz sand and conductive liquid are filled in the plane where the corresponding pollution areas are located in the well body, and bentonite is filled in the plane where the corresponding pollution-free areas are located.
5. An in situ remediation system for organically-contaminated soil and groundwater, comprising: an extraction well, a vapor extraction assembly, a liquid extraction assembly and the intelligent electrode well control system according to any one of claims 1-4;
the electrode well and the extraction well are arranged in a preset area of organic polluted soil and underground water;
the extraction well is respectively connected with a vapor extraction assembly and a liquid extraction assembly, the vapor extraction assembly comprises a vacuum pump, an atomization spraying unit, a steam-water separator and a tail gas treatment unit which are sequentially connected, and the liquid extraction assembly comprises an extraction pump, a mass flowmeter, a condenser, a three-phase separator and a sewage treatment unit which are sequentially connected; the liquid outlet of the steam-water separator is connected with the liquid inlet of the condenser, the gas outlet of the three-phase separator is connected with the gas inlet of the tail gas treatment unit, and the oil outlet of the three-phase separator and the oil outlet of the tail gas treatment unit are both connected to the storage tank.
6. The in-situ remediation system of claim 5, wherein the intelligent control unit is further coupled to one or more of the vacuum pump, atomizing spray unit, steam-water separator, tail gas treatment unit, extraction pump, mass flow meter, condenser, three-phase separator, sewage treatment unit, and storage tank for intelligent control of in-situ thermal desorption and electrocatalytic oxidation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE1146260B (en) * | 1954-01-19 | 1963-03-28 | Montedison Spa | Furnace for fused flux electrolysis for the extraction of metals, in particular aluminum, and method for operating such a furnace |
| CN111822495A (en) * | 2020-07-29 | 2020-10-27 | 广东佳德环保科技有限公司 | In-situ soil remediation system and method based on thermal desorption and electrochemical reinforcement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1146260B (en) * | 1954-01-19 | 1963-03-28 | Montedison Spa | Furnace for fused flux electrolysis for the extraction of metals, in particular aluminum, and method for operating such a furnace |
| CN111822495A (en) * | 2020-07-29 | 2020-10-27 | 广东佳德环保科技有限公司 | In-situ soil remediation system and method based on thermal desorption and electrochemical reinforcement |
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