CN109396168B - Combined heat exchanger for in-situ thermal remediation of polluted soil and soil thermal remediation system - Google Patents
Combined heat exchanger for in-situ thermal remediation of polluted soil and soil thermal remediation system Download PDFInfo
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- CN109396168B CN109396168B CN201811461111.7A CN201811461111A CN109396168B CN 109396168 B CN109396168 B CN 109396168B CN 201811461111 A CN201811461111 A CN 201811461111A CN 109396168 B CN109396168 B CN 109396168B
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- 239000002689 soil Substances 0.000 title claims abstract description 101
- 238000005067 remediation Methods 0.000 title claims abstract description 27
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- 231100000719 pollutant Toxicity 0.000 claims description 67
- 238000010438 heat treatment Methods 0.000 claims description 65
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- 239000007789 gas Substances 0.000 claims description 50
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- 239000007788 liquid Substances 0.000 claims description 20
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- 239000000428 dust Substances 0.000 claims description 11
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- 241001465754 Metazoa Species 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- HWIAOIWHKQDKIH-UHFFFAOYSA-N [Fe].[Mg].[Cd] Chemical compound [Fe].[Mg].[Cd] HWIAOIWHKQDKIH-UHFFFAOYSA-N 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- 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 discloses a combined heat exchanger for in-situ thermal remediation of polluted soil and a soil thermal remediation system.
Description
Technical Field
The invention relates to the field of environmental heat restoration equipment, in particular to a heat exchanger for restoring polluted soil.
Background
Soil pollutants have the characteristics of wide sources, multiple types, coexistence of new and old pollutants and combined existence of inorganic type pollution and organic type pollution. The inorganic pollutants mainly comprise heavy metals such as cadmium, mercury, arsenic, copper, lead, chromium, zinc, nickel and the like, and the organic pollutants are various, and comprise benzene series such as toluene and the like, halogenated hydrocarbon such as trichloroethylene and the like and semi-volatile organic pollutants such as polycyclic aromatic hydrocarbon, polychlorinated biphenyl, organochlorine pesticide and the like.
From the viewpoint of pollution control, soil remediation treatment technological ideas can be divided into the following two categories: (1) Removing and degrading pollutants in soil, reducing absolute content of the pollutants, and reducing environmental risks; (2) The occurrence form of pollutants in soil is changed, the mobility and bioavailability of the pollutants in the environment are reduced, and the migration and transformation of the pollutants into animals, plants, water bodies and the atmosphere are controlled.
Research on soil remediation treatment is mature, and part of the technology is widely applied to engineering. Because the composition of the pollutants in the soil is complex and the properties are different, different repair treatment technologies can be adopted for various types of pollutants.
Physical remediation techniques include soil displacement, soil isolation, molten vitrification, electrokinetic remediation, etc., for heavy metal contamination, and thermal desorption, soil Vapor Extraction (SVE), etc., for thermal volatile contaminants. In the existing soil remediation engineering, a solidification and stabilization technology is often adopted to remediate heavy metal contaminated soil, and a soil vapor extraction and heat treatment technology is adopted to remediate organic contaminated soil.
Soil restoration techniques can also be divided into in-situ restoration techniques and ex-situ restoration techniques depending on whether soil restoration requires excavation. Generally, the high-concentration polluted soil is mainly treated by an ectopic restoration technology, and the polluted soil can not be backfilled for continuous use after restoration; for the volatile organic compound contaminated sites, the process of excavation, displacement and transportation is easy to cause secondary pollution of the contaminants to the environment, so that the in-situ repair technology is more commonly used.
An in-situ remediation method uses a soil vapor extraction technique (also known as soil vapor leaching) to create negative pressure in the subsurface soil using a vacuum pump to force air to flow through the contaminated soil pores, carry volatile and semi-volatile contaminants out of the extraction well and dispose of the same, thereby reducing the total amount of contaminants in the soil. The technology can be combined with an air injection technology, is mainly used for repairing the polluted soil in an unsaturated zone (a gas-covered zone), but has higher requirement on the permeability of the soil and certain limitation.
An in-situ method for repairing electrodynamic repair by directly inserting electrodes into polluted soil is carried out in a wet environment, the polarity of the pollutants of the soil is needed to be considered, the heating temperature is about 100 ℃, the repair temperature is lower, and the repair period is longer.
A polluted site adopts an in-situ thermal repair technology, electric power is used for driving, and resistance heating is used for indirectly heating the polluted site, so that the heating temperature is high and can reach 100-400 ℃. The technical heat exchanger adopts the heating wires to heat the radiation sleeve, quartz is used between the heating wires, and the short circuit caused by direct contact of bare heating wires is prevented.
A polluted site is repaired by using combustion hot flue gas by an in-situ thermal repair technology, and comprises an inner sleeve, an outer sleeve and an inner sleeve opening, wherein the flue gas firstly enters the inner (outer) sleeve and then enters the outer (inner) sleeve to flow out. The heating temperature can reach 100-500 ℃. The method has simple design and high site repairing speed.
In situ heat treatment technology is the preferred treatment mode for organically polluted soil. The heat treatment technology utilizes the characteristic of enhanced volatility of the pollutant under the heating condition, uses direct or indirect heat exchange to improve the soil temperature (150-760 ℃) and promote the pollutant to be resolved out of soil particles and soil combined water, and enhances the mobility of the pollutant, thereby recovering gas and carrying out advanced treatment. The in-situ heat treatment technology can adopt more heating mediums, and can also adopt an electric heating mode besides hot air, hot steam and hot flue gas.
Disclosure of Invention
The invention provides a combined heat exchanger for in-situ heat repair of polluted soil and a soil heat repair system using the heat exchanger, which can simultaneously carry out flue gas heat repair and resistance heat repair to form a multi-functional complementary mechanism and have double guarantee.
The utility model provides a contaminated soil normal position heat repair is with combination heat exchanger, including outer sleeve, inner sleeve, the regional spiral winding electric heater of outer wall of inner sleeve, electric heater includes the resistance wire, sets up an intermediate sleeve in addition between the inner sleeve, puts the resistance wire on the electric heater in intermediate sleeve and the inner sleeve in the middle of, sets up the electrical heating wiring on the electric heater, and the space between inner sleeve and the outer sleeve uses the flange to weld sealedly, and high temperature flue gas gets into from the inner sleeve, and the inner sleeve lower part opening, and high temperature flue gas flows from the export of outer sleeve side, and the inner sleeve runs through inside the outer sleeve, use magnesium oxide to fill between intermediate sleeve and the inner sleeve.
The utility model provides a contaminated soil normal position heat repair is with combination heat exchanger, includes outer sleeve, inner skleeve, sets up U type electric heater in the inner skleeve, and electric heater includes resistance wire, magnesium oxide, and sealing flange is used on the inner skleeve upper portion to set up the electrical heating wiring, the space uses flange welding to seal between inner skleeve and the outer sleeve, and high temperature flue gas gets into from the inner skleeve, and the inner skleeve lower part opening, high temperature flue gas flows out from the outer sleeve side export, and the inner skleeve runs through inside the outer sleeve.
The utility model provides a contaminated soil normal position heat repair is with combination heat exchanger, including outer sleeve, inner sleeve, set up U type electric heater in the inner sleeve, electric heater includes the resistance wire, uses insulating material to keep apart on the resistance wire every 0.5 ~ 1 m's distance, and inner sleeve upper portion uses sealing flange to seal to set up the electrical heating wiring, and the space between inner sleeve and the outer sleeve uses flange to weld sealedly, and high temperature flue gas gets into from the inner sleeve, and the inner sleeve lower part opening, and high temperature flue gas flows out from the outer sleeve side export, and the inner sleeve runs through inside the outer sleeve.
The utility model provides a contaminated soil combination heat exchanger for normal position hot repair, including outer sleeve, inner sleeve, set up spiral electric heater in the inner sleeve, electric heater inside is provided with resistance wire, magnesium oxide in addition, outer sleeve surface is provided with the hole groove of exhaust gas, discharge the pollutant near the heating zone together with the flue gas after the heat transfer and carry out the aftertreatment, flue gas gets into the heat exchanger from inner sleeve side entry, flow out the heat exchanger from outer sleeve, side export, the sealing flange is used on inner sleeve upper portion to set up the electrical heating wiring, the space uses the flange welded seal between inner sleeve and the outer sleeve, the inner sleeve runs through inside the outer sleeve.
The utility model provides a contaminated soil normal position thermal remediation system, including gas internal-combustion engine, gas internal-combustion engine drive generator generates electricity, gas internal-combustion engine is provided with the appurtenant component, lubricating oil cooler and cylinder liner water cooler, exchange heat with lubricating oil cooler, cylinder liner water cooler through medium heat exchanger, medium for heat transfer exists in the container, and send into the injection well through the high-pressure pump, place above-mentioned combination heat exchanger in the heating well that beats in advance, exhaust gas after the work is done to gas internal-combustion engine piston, through the exhaust pipe, get into in the inner skleeve in combination heat exchanger, beat the pollutant vacuum extraction well in soil, the vacuum extraction pump is connected the vacuum extraction well, the pollutant that comes out from the vacuum extraction pump passes through the pollutant pipe network and conveys pollutant treatment system, pollutant gas carries out further oxidative decomposition to the pollutant through the thermal oxidation ware, gaseous pollutant passes through spray type condenser in, further cooling reduces the pollutant temperature, the fluid after cooling gets into the gas-liquid separator, separate out liquid pollutant, then let into active carbon adsorption device, pollutant that comes out from the gas-liquid state separator and active carbon adsorption device, pollutant that comes out in the filter, at first, get into the filter, and then get into the dust and mix gas in the exhaust gas through the exhaust pipe, the flue gas that comes out in the flue gas stack, the dust concentration of the flue gas that reaches the dust collector, the dust is reduced.
And (3) a test well is drilled in the soil, and a temperature sensor and a pressure sensor are arranged in the test well.
The heating well, the injection well, the vacuum extraction well and the test well are all sealed with cement at the opening.
The extraction wells are arranged at the middle positions of the two heating wells, the test wells are close to the positions near the heating wells, and the distance between the heating wells is 3-8 m.
And a small cobble and gravel are used for filling between the combined heat exchanger and the heating well.
The invention carries out in-situ indirect heating restoration on the polluted soil by using high-temperature flue gas and electric power generated by the gas internal combustion engine, and the high-temperature flue gas and electric resistance heating are combined in the heat exchanger to carry out flue gas thermal restoration and electric resistance thermal restoration simultaneously, so that a multi-energy complementary mechanism is formed, double guarantee is provided, and the temperature of soil restoration can be obviously improved by using the heat exchanger.
Drawings
FIG. 1 is a schematic diagram of a contaminated soil in situ thermal remediation system for a gas internal combustion engine system.
Fig. 2a, 2b, 2c, 2d are schematic diagrams of a first type of combined heat exchanger.
Fig. 3a, 3b, 3c, 3d, 3e are schematic diagrams of a second type of combined heat exchanger.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the description.
A schematic diagram of a contaminated soil in situ thermal remediation system for a gas internal combustion engine system is shown in fig. 1.
The gas distributed energy source is a gas internal combustion engine 10, natural gas 01 and air 02 enter a cylinder of the gas internal combustion engine to burn, a piston of the gas internal combustion engine 10 is driven to do work, and a generator 11 connected with a crankshaft and a connecting rod is driven by the piston to generate electricity. The voltage level of the generated power can be divided into 0.4kV and 10kV according to the size of the internal combustion engine, and the power supplied to the resistance heater 32 can be regulated through the transformer 12 to control the resistance heating temperature. The transformed power is connected to the positive and negative poles of the wiring of the lug resistance heater 32 through the power supply line 04 and the return line 05. The gas internal combustion engine 10 is exhausted after the piston does work, the exhaust temperature is 500 ℃, and the gas enters an injection port of the resistance heater through the exhaust pipe 03. At this time, the heating temperature of the flue gas can be adjusted by the excess coefficient of the air 02, and also can be adjusted by increasing or decreasing the flow of the natural gas 01. The lubricating oil cooler 13 and the cylinder liner water cooler 14 are accessory parts of the gas internal combustion engine 10, and exchange heat with the lubricating oil cooler 13 through a medium heat exchanger 15, wherein a medium for heat exchange, which can be water, a reaction catalyst or air, exists in a container 16. Is fed into injection well 25 by high pressure pump 17. The injection water in the injection well is beneficial to improving the permeability of underground polluted soil, and the extraction well forms a passage; the aeration of air or the reaction of the catalyst is beneficial to accelerating the oxidation and the resolution of soil pollutants. The container 16 may not be used when the medium is air.
Contaminated soil 20, which requires remediation, has a water line 21. Before the thermal soil repair, the vacuum extraction pump can be used in advance to pump free water in the polluted soil, so that the water level line 21 is reduced, the use of natural gas fuel can be reduced, and the energy is saved. For chemically bound water and soil particles to absorb water, a heater is used to heat above the boiling point of water to effect evaporation of the water. The upper portion of the area where the thermal repair is performed is required to be sealed with the cover layer 22. The coating 22 is made of cement, and a layer of heat insulating material such as asbestos can be added below the cement to form a combined coating. The cover layer has four functions: 1) The method can effectively block pollutant gas permeated out in the soil thermal remediation process, and reduce secondary pollution; 2) Can insulate heat and prevent the soil surface from being too high in temperature; 3) A support platform can be provided for the heating device; 4) Rainwater can be hindered from entering the repaired contaminated soil area.
The heating well is pre-drilled by using the sonic drill, then the combined heat exchanger outer sleeve 23 and the inner sleeve 28 are assembled, the electric heater 32 is inserted into the heating well, the diameter of the drilled well by the sonic drill is larger than that of the outer sleeve of the heat exchanger, a certain allowance is reserved, and the pebbles and the gravels 27 are uniformly distributed around the heater to fill the heating well and the gaps in front of the drilled well. The cobbles and gravels 27 have a strong thermal conductivity.
The same sonic drill was used to pre-drill the well, to insert the contaminant vacuum extraction well 24 therein, and to fill the void with pebbles and gravel 27. The cobbles and the gravels 27 have a strong fluid permeability. The extraction wells are perforated or slotted in the contaminated area to enable perforation of the holes to allow permeation of heated contaminant gases or liquids into the vacuum extraction wells 24. The vacuum referred to herein refers to a vacuum state of an underground contaminated soil area caused by the continuous suction of the underground by the vacuum extraction pump 40. The vacuum degree of the polluted soil is improved, the analysis and desorption of pollutants are facilitated, and meanwhile, the gas in the heating process is prevented from being dissipated into the air. The vacuum extraction wells may be located closer to the heating wells, sometimes because contaminants may also be generated near the heating wells, between the vacuum extraction wells and the flue gas heating wells and the resistive heating wells.
The fluid medium is injected into the injection well 25 through the high-pressure pump 17 by water, air and reaction catalyst after heat exchange with the medium heat exchanger 15. Injection well 25 is similar in construction to the extraction well, and injection well 25 is typically disposed in an area proximate the heating well. The water is injected, so that the penetration of soil is facilitated under the heat drive, and a passage is formed between the water and an extraction well; the injection of air is favorable for the oxidation reaction of pollutants in a high-temperature environment, and the decomposition and desorption efficiency of the pollutants can be accelerated and the pollutant substance structure can be changed when the catalyst is injected. The injection well may not be in operation at all times.
The test well 26 is used for temperature and pressure testing, and by using a temperature sensor and a pressure sensor, the temperature and pressure vacuum degree of the polluted soil area 20 is monitored and controlled, and temperature and pressure signals are sent to a monitoring platform for analysis through a data acquisition and conversion device, so that the temperature of flue gas heating and resistance heating and the vacuum degree in the polluted soil are adjusted. The measurement of the temperature and pressure inside the contaminated soil can also be performed without using a test well, and the test probe can be directly inserted into the contaminated soil. Before proceeding with the project, soil contaminant content tests are performed, and contaminant test wells may be used to determine their location, contaminant concentration, and volume. The concentration of contaminants in the fluid of vacuum pump 40 may be detected during the soil thermal remediation process.
The flue gas heating well, the resistance heating well, the injection well, the vacuum extraction well and the test well are all sealed with cement at the opening. Preventing the body from leaking from the outside of the pipe well to the atmosphere to cause secondary pollution.
The contaminant gas or gas-liquid mixture exiting vacuum extraction pump 40 is passed through a contaminant pipe network 09 to a contaminant treatment system. The contaminant gas undergoes further oxidative decomposition of the contaminant through the thermal oxidizer 41. The gaseous contaminants pass through the spray condenser 42 and are further cooled to reduce the temperature of the contaminants, and the cooled fluid enters the gas-liquid separator 43 to separate out the contaminants in liquid form. And then passed to activated carbon adsorption unit 44. Liquid contaminants exiting spray condenser 42, gas-liquid separator 43 and activated carbon adsorption unit 44 first enter filter 48 and then enter water treatment unit 49 for treatment, and the treated liquid is required to meet discharge requirements. The flue gas from the flue gas exhaust pipe 08 and the gaseous pollutants from the activated carbon adsorption device 44 are converged in the bag-type dust collector 45, dust in the gas is reduced, the mixed gas is introduced into the flue gas desulfurization and denitrification device 46, the concentration of sulfides and nitrifiers in the gas is reduced, and finally the gas reaching the standard is discharged through the flue gas chimney 47. In addition, only one of the pollutant treatment modes is listed above, and for the pollutants containing the combustibility free of hydrocarbons, the pollutants can be directly condensed by using a heat exchanger and a condenser and then subjected to subsequent treatment, so that the high-temperature thermal oxidation step is omitted.
The extraction well is arranged in the middle of the heating well. The test well is located near the heater well. The distance between the heating wells is 3-8 m, and the closer the distance is, the more favorable for rapidly repairing the polluted site.
The most important underground contaminated soil heat exchange components of the technology are described below.
Fig. 2 is a schematic diagram of a combined heat exchanger composed of a first type of flue gas heater and an electric heater.
As shown in fig. 2a, the combined heat exchanger comprises an outer sleeve 23, an inner sleeve 28, an electric heater 32 spirally wound around the outer wall surface area of the inner sleeve 28, the combined heat exchanger is placed in a well which is pre-drilled and needs to be heated, the space between the combined heat exchanger and the well is filled with cobbles and gravels 27, and the inner structure is visible in the middle section as shown in fig. 2 b. High temperature flue gas enters from the inner sleeve 28, the lower part of the inner sleeve is opened, hot flue gas flows out from the outer sleeve outlet 37, and heat is transferred from the combined heat exchanger to the polluted soil. The electric heater of this technology is arranged in two ways, one is as shown in fig. 2c, the electric heater 32 with insulated surface is directly used to spirally wind the outer wall surface of the inner sleeve 28, the electric heater 32 is provided with an electric heating connection 35, and the inner sleeve and the outer sleeve are connected by using a flange 36. Alternatively, as shown in fig. 2d, an intermediate sleeve 31 is additionally provided between the inner and outer sleeves, and the electric resistance wire 30 on the electric heater 32 is placed between the intermediate sleeve 31 and the inner sleeve 28 and filled with magnesium oxide 29.
The flue gas of the first type of combined heat exchanger is not in direct contact with the soil polluted gas, so that the service life of the combined heat exchanger can be prolonged.
Fig. 3 is a schematic diagram of a combined heat exchanger composed of a second type of flue gas heater and an electric heater.
As shown in fig. 3a, 3b, this type of heater places an electric heater inside the flue gas heating inner sleeve 28. The electric heater in the inner sleeve 28 has three forms, the first of which is shown in figure 3c, and uses an insulated resistive heat exchanger containing a resistive wire 30, magnesium oxide 29 and a 310S stainless steel protective shell, the magnesium oxide having good thermal conductivity. Second, as shown in fig. 3d, the resistance wire 30 is directly used, and the quartz insulating material 33 is used on the resistance wire 30 at intervals of 0.5-1 m, so as to prevent the short circuit caused by the cross contact of the resistance wire 30. Third, as shown in fig. 3e, the third uses a screw heater 32, which has a resistance wire 30 and magnesium oxide 29 inside. The elevation of the combined heater is shown in fig. 3b, and the circular or rectangular hole grooves 39 on the surface of the outer sleeve 23 of the combined heat exchanger can discharge pollutants near the heating area together with the flue gas after heat exchange for post-treatment. The flue gas enters the heat exchanger from the side inlet 34 of the inner sleeve 28 and flows out of the heat exchanger from the side outlet 37 of the outer sleeve 23, the upper part of the inner sleeve 28 is sealed by a sealing flange 38, an electric heating wire 35 is arranged, and the gap between the inner sleeve and the outer sleeve is sealed by welding by a flange 36. The heater in the second type of combination heat exchanger is placed within the inner sleeve 28 of the combination heat exchanger and does not corrode due to contact with contaminants.
The smoke sleeve material of the two types of combined heat exchangers recommends ND stainless steel or 310S stainless steel, has higher high-temperature limit and stronger acid corrosion resistance, and completely meets the high-temperature and acid corrosion conditions of smoke. The surfaces of the inner sleeve and the outer sleeve are blackened, so that the heat radiation intensity is increased. The electric heating wire adopts alloy materials with high temperature softening resistance, strong resistance and heat resistance, such as Ni80 alloy, iron-cadmium-magnesium alloy and the like; the filling is performed by using a magnesium oxide material which has electrical insulation and good thermal conductivity. The heating temperature of the combined heat exchanger can reach 500-800 ℃, the temperature is higher, and the pollutant removing process can be accelerated.
The technology can be applied to the remediation of the contaminated soil of hydrocarbon compounds and derivatives thereof, is suitable for volatile, semi-volatile and difficult-volatile pollutants, and can be applied to heavy metal pollutants with low boiling points.
The power generation and smoke system of the gas internal combustion engine drives the internal combustion engine to do work through the combustion of natural gas, 30-45% of electric power resources can be generated, and 40-45% of high-temperature smoke at 400-450 ℃ can be generated. In addition, the gas internal combustion engine needs to cool the cylinder liner and lubricating oil of the internal combustion engine, and can generate hot water at 50-90 ℃. The power source can be directly or indirectly used for the combined heat exchanger. And the high-temperature flue gas is introduced into a combined heat exchanger to indirectly heat the polluted soil. The generated cylinder sleeve water can exchange heat through the heat exchanger to introduce air, catalyst, water and other fluid media into the injection well, so as to accelerate the soil pollutant removal process.
According to the combined heat exchanger for the polluted soil, the temperature of the polluted soil is gradually increased along with the increase of heat, so that the temperature of pollutants in the polluted soil is higher than the gasification temperature of the pollutants, and the pollutants are finally evaporated from the soil through the processes of resolution, pyrolysis, oxidation and the like under the action of vacuum pump extraction.
In some cases, the present technology is still adapted to the presence of soil contaminants in admixture with liquid water. Firstly, the water in the soil gap is used for carrying pollutants, so that the water level line of the underground soil can be reduced. Contaminants entrained in the water are pumped up for post-treatment. Secondly, after the liquid water closely contacted with the polluted soil is heated by the heat exchanger, the heating temperature is far higher than the gasification point of the water, and pollutants can be carried in the water to be evaporated together under the action of vacuum suction. And thirdly, the high-temperature environment can destroy the material structure of some pollutants, so that the pollutants are crushed and resolved, and the pollutants in the soil can be removed as well. Finally, as described above, the contaminated soil is injected in the invention, the injection medium can be air, water or a contaminant reaction catalyst after heat exchange, and the air and water are introduced to form a passage with the extraction well; the air or the reaction catalyst is introduced to pyrolyze or oxidize pollutants, so that the pollutant removal efficiency is improved. For the low-volatility pollutant with high boiling point, the highest temperature can reach about 500 ℃ because the flue gas temperature and the resistance heating quantity can be adjusted, so the method is also suitable for the low-volatility pollutant with high boiling point.
The heating well, the injection well and the extraction well are not limited to be placed vertically, horizontally or at a certain inclination angle according to different field restoration requirements. The extraction well extracts pollutants in the soil, so that the polluted soil forms a vacuum environment. The extraction well is a sleeve containing holes or slots that allow contaminants to pass through. Porous media such as cobblestones, gravels and the like are filled between the outer layers of the heating well, the injection well and the extraction well and the well which is well beaten in advance.
For the earlier stages of the project, a number of contaminant test wells may be made to determine where the contaminant is located, the concentration of the contaminant, and the volume. For the soil remediation process, the concentration of pollutants can be detected and monitored at the outlet of the extraction well, meanwhile, a temperature and pressure test well can be installed near the heating well, and a temperature and pressure sensor can be installed in the temperature and pressure test well to monitor and control the heating temperature and the extraction vacuum degree of the polluted soil.
The invention can be used for shallow soil thermal remediation and deep soil thermal remediation. Because the heating temperature is higher, the deepest place that this patent can repair is-10 m.
The surface layer of the soil restoration area of the invention is provided with a covering layer, and the material of the covering layer is a cement layer with the thickness of 20cm or a composite covering layer formed by the cement layer and heat insulation materials such as asbestos and the like. Can effectively insulate heat, prevent the heated polluted gas from penetrating into the external atmosphere to form secondary pollution, and simultaneously prevent rainwater and the like from penetrating into the ground. In addition, in order to prevent the diffusion of pollutants to the surrounding soil, a deeper iron plate can be vertically driven into the periphery of the polluted soil.
The invention relates to a polluted gas extraction, collection and flue gas treatment system, which is characterized in that a pipe network is used for connecting an extraction well, a vacuum pump, flue gas and polluted gas treatment system. The pollutants are extracted from the vacuum pump through the vacuum pump and enter a pollutant gas treatment system, the pollutants are further oxidized and decomposed, high-temperature pollutant gas enters a spraying device, the temperature is further reduced, then gas-liquid separation is carried out, and the pollutants outside liquid after the gas-liquid separation and the sprayed heat-exchanged liquid are subjected to water treatment and then are discharged after reaching standards. And (3) carrying out activated carbon adsorption on the gas discharged from the spraying device, then carrying out bag dust removal, desulfurization and denitrification, reducing dust and acidic substances, and finally discharging the gas up to the standard. The flue gas for heating can be directly subjected to dust removal, desulfurization and denitrification and then discharged after reaching standards. The gas-liquid separation and condensed water spraying are required to be treated with water to reach the standard and then can be discharged.
Claims (9)
1. The utility model provides a contaminated soil combination heat exchanger for in situ thermal remediation, a serial communication port, including outer sleeve (23), inner sleeve (28), the outer wall area spiral winding electric heater (32) of inner sleeve (28), electric heater (32) include resistance wire (30), set up in addition intermediate sleeve (31) between inner sleeve, put resistance wire (30) on electric heater (32) in intermediate sleeve (31) and inner sleeve (28), set up electric heating wiring (35) on electric heater (32), the space uses flange (36) welded seal between inner sleeve (28) and outer sleeve (23), high temperature flue gas gets into from inner sleeve (28), inner sleeve (28) lower part opening, high temperature flue gas flows out from outer sleeve (28) side export (37), inner sleeve (28) run through inside outer sleeve (23), use magnesium oxide (29) to pack between intermediate sleeve (31) and inner sleeve (28).
2. The utility model provides a pollute soil combination heat exchanger for normal position hot repair, a serial communication port, including outer sleeve (23), inner skleeve (28), set up U type electric heater (32) in inner skleeve (28), electric heater (32) are including resistance wire (30), magnesium oxide (29), sealing flange (38) are used on inner skleeve (28) upper portion to set up electrical heating wiring (35), flange (36) welding seal is used in the space between inner skleeve (28) and outer sleeve (23), high temperature flue gas gets into from inner skleeve (28), inner skleeve (28) lower part opening, high temperature flue gas flows out from outer skleeve (28) side export (37), inner skleeve (28) run through inside outer sleeve (23).
3. The utility model provides a pollute soil combination heat exchanger for normal position hot repair, a serial communication port, including outer sleeve (23), inner sleeve (28), set up U type electric heater (32) in inner sleeve (28), electric heater (32) are including resistance wire (30), use insulating material (33) to keep apart at every 0.5 ~ 1m distance on resistance wire (30), inner sleeve (28) upper portion is sealed with sealed flange (38), and set up electrical heating wiring (35), gap between inner sleeve (28) and outer sleeve (23) is sealed with flange (36) welding, high temperature flue gas gets into from inner sleeve (28), inner sleeve (28) lower part opening, high temperature flue gas is from outer sleeve (28) side export (37) outflow, inner sleeve (28) run through outer sleeve (23) inside.
4. The utility model provides a contaminated soil combination heat exchanger for normal position hot repair, a serial communication port, including outer sleeve (23), inner sleeve (28), set up heliciform electric heater (32) in inner sleeve (28), electric heater (32) inside is still electric resistance wire (30), magnesium oxide (29), outer sleeve (23) surface is provided with the hole groove (39) of exhaust gas, discharge the pollutant near the heating zone together with the flue gas after the heat transfer and carry out the aftertreatment, flue gas gets into the heat exchanger from inner sleeve side entry (34), flow out the heat exchanger from outer sleeve (23) side exit (37), inner sleeve (28) upper portion uses sealing flange (38) to set up electric heating wiring (35), the space uses flange (36) welded seal between inner sleeve (28) and the outer sleeve (23), inner sleeve (28) run through inside outer sleeve (23).
5. The utility model provides a contaminated soil normal position thermal remediation system which characterized in that, including gas internal-combustion engine (10), gas internal-combustion engine (10) drive generator (11) electricity generation, gas internal-combustion engine (10) are provided with accessory parts, lubricating oil cooler (13) and cylinder liner water cooler (14), heat transfer is carried out with lubricating oil cooler (13) through medium heat exchanger (15), cylinder liner water cooler (14), medium for heat transfer exists in container (16), and send into injection well (25) through high-pressure pump (17), place the combination heat exchanger of claim 1-4 in the heating well that beats in advance, exhaust gas after the work is done to gas internal-combustion engine (10) piston, through flue gas pipeline (03), in inner sleeve (28) in the combination heat exchanger, beat pollutant vacuum extraction well (24) in soil, vacuum extraction pump (40) are connected vacuum extraction well (24), pollutant that comes out from vacuum extraction pump (40) is passed through pollutant (09) and is passed to pollutant treatment system, pollutant gas is passed through thermal oxidation ware (41) and is carried out and is further oxidation and is decomposed pollutant, gaseous pollutant is passed through condenser (42) and is passed through in the cooler (42) and is cooled down, the active carbon is separated from the condensate device (42) after the condensate is passed through, the condensate device is cooled down, the condensate is cooled down and is separated from the active carbon condensate device (42) is separated from the condensate device and cooled down fluid is separated from the active carbon liquid carbon Liquid pollutants in the gas-liquid separator (43) and the activated carbon adsorption device (44) firstly enter a filter (48), then enter a water processor (49) for treatment, the flue gas from the flue gas exhaust pipe (08) and the gaseous pollutants from the activated carbon adsorption device (44) are converged in a bag-type dust collector (45), dust in the gas is reduced, the mixed gas is introduced into a flue gas desulfurization and denitrification device (46), the concentration of sulfide and nitrified substances in the gas is reduced, and finally the gas reaching standards is discharged through a flue gas exhaust chimney (47).
6. The contaminated soil in situ thermal remediation system of claim 5 wherein a test well (26) is drilled in the soil, and a temperature sensor and a pressure sensor are provided in the test well (26).
7. The contaminated soil in situ thermal remediation system of claim 6 wherein the heating well, injection well (25), vacuum extraction well (24) and test well (26) are all sealed with cement.
8. A contaminated soil in situ thermal remediation system according to claim 6 wherein the vacuum extraction wells (24) are arranged at intermediate locations of two heating wells, the test wells (26) being located close to the heating wells, the distance between the heating wells being 3-8 m.
9. A contaminated soil in situ thermal remediation system according to claim 6 wherein said combination heat exchanger and heating well are filled with pebbles and gravel (27).
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