CN111299312A

CN111299312A - In-situ resistance thermal desorption simulation device

Info

Publication number: CN111299312A
Application number: CN202010119651.8A
Authority: CN
Inventors: 孟宪荣; 许伟; 吴建生
Original assignee: Suzhou environmental science research institute
Current assignee: Suzhou environmental science research institute
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-06-19

Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to an in-situ resistance thermal desorption simulation device which comprises a resistance thermal desorption device, a ventilation pipe, a three-phase separator, a condensing device, a water storage tank, an activated carbon adsorption pipe, a vacuum pump, a dosing pump and a dosing barrel, wherein the top of the resistance thermal desorption device is connected with the ventilation pipe, the middle position of the top of the resistance thermal desorption device is provided with a connecting flange, and the connecting flange is connected with an air inlet of the three-phase separator through a pipeline; the design of the vertical extraction pipe well realizes the function of separately extracting the gas phase and the liquid phase, can respectively control the extraction flow of the gas phase and the liquid phase, and is more beneficial to the extraction of NAPL; the design of the gas-liquid separation system of the three-phase separator well solves the problem that the traditional extraction equipment cannot drain water when in continuous operation.

Description

In-situ resistance thermal desorption simulation device

Technical Field

The invention relates to the technical field of soil remediation, in particular to an in-situ resistance thermal desorption simulation device.

Background

The resistance heating technology is widely applied abroad, the technology is relatively mature, but domestic engineering application for treating polluted soil and underground water by the resistance heating technology starts late, and less independently researched and developed resistance heating equipment is available. Therefore, the development of the resistance heating equipment suitable for the condition of the polluted site in China is realized, and the corresponding urgent requirements of environment protection management and polluted site repair market in China are significant for eliminating environmental risks, ensuring human living safety, maintaining ecological environment balance and guaranteeing ordered utilization of water resources.

Disclosure of Invention

The invention aims to provide an in-situ resistance thermal desorption simulation device to solve the problem of repairing soil by resistance heating in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: an in-situ resistance thermal desorption simulation device comprises a resistance thermal desorption device, a ventilation pipe, a three-phase separator, a condensing device, a water storage tank, an activated carbon adsorption pipe, a vacuum pump, a dosing pump and a dosing barrel, wherein the top of the resistance thermal desorption device is connected with the ventilation pipe, a connecting flange is installed at the middle position of the top of the resistance thermal desorption device, the connecting flange is connected with an air inlet of the three-phase separator through a pipeline, a gas temperature sensor, a pressure sensor, a flow sensor and an electric valve are sequentially installed on the pipeline between the connecting flange and the three-phase separator from left to right, a gas outlet of the three-phase separator is connected with the condensing device through a pipeline, a drain valve is installed at the bottom of the condensing device, a thermometer is installed on the condensing device, the condensing device is communicated with the water storage tank through a pipeline, and the water storage tank is connected with the, the device comprises a water storage tank, an active carbon adsorption pipe, a vacuum pump, a micro gas flowmeter, a PID sensor, a resistance thermal desorption device, a chemical dosing pump, a chemical dosing barrel, a conductometer, a heating tank body, a partition plate, an air channel, an electrode, a pumping pipe, a suction pipe, a vent groove, a sampling pipe and a sampling pipe, the extraction pipe is communicated with the vent groove, anti-blocking pipe inlet covers are installed on the left side and the right side of the top of the heating tank body, and temperature sensors are installed on the inner wall of the partition plate.

Preferably, the top of the resistance thermal desorption device is further provided with an explosion-proof valve, and the explosion-proof valve is located in an inner cavity of the connecting flange.

Preferably, the inner cavity of the heating tank body is filled with a heat insulation cotton layer, and the inner tank body is located in the inner cavity of the heat insulation cotton layer.

Preferably, the quantity of ventilation pipe is two at least, prevent that stifled pipe inlet cover is including interior sieve screen panel, the outside joint of interior sieve screen panel has outer sieve screen panel, it accomodates the cavity to be equipped with soil between interior sieve screen panel and the outer sieve screen panel.

Preferably, the condensing device comprises two left and right spiral condensing tube groups, a sub-cooling vent pipe is connected between the two spiral condensing tube groups, and the spiral condensing tube groups comprise two spiral condensing tubes communicated through a three-way pipe.

Preferably, a ventilation cavity is arranged between the top of the partition board and the heating tank body, vent holes are uniformly formed in the outer wall of the electrode, and the electrode is connected with the ventilation cavity through the vent holes.

Preferably, the electrode is a copper-red electrode.

Preferably, the resistance thermal desorption device is further connected with a real-time data monitoring system through a wire or a wireless communication module.

Preferably, the real-time data monitoring system comprises an upper computer control unit and an electric control cabinet control system, and the upper computer control unit is electrically and bidirectionally connected with the electric control cabinet control system through a network cable.

Preferably, a safety isolation transformer is further installed on the resistance thermal desorption device, and the safety isolation transformer is in output connection with the real-time data monitoring system through a lead.

Compared with the prior art, the invention has the beneficial effects that: the invention adopts a vacuum pump assisted extraction mode to realize the conversion and collection treatment of pollutants from the soil solid phase environment gas phase environment; the design of the vertical extraction pipe well realizes the function of separately extracting the gas phase and the liquid phase, can respectively control the extraction flow of the gas phase and the liquid phase, and is more beneficial to the extraction of NAPL; the design of a gas-liquid separation system of the three-phase separator well solves the problem that the traditional extraction equipment cannot drain water when in continuous operation; the experimental device can determine the key parameters such as temperature, extraction air quantity, vacuum degree, extraction time and the like required by the thermal desorption technology, and provides important basis for later repair engineering.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a resistance thermal desorption device according to the present invention;

FIG. 3 is a schematic block diagram of a real-time monitoring system of the resistance thermal desorption device of the present invention;

fig. 4 is a circuit diagram of the safety isolation transformer of the present invention.

In the figure: 1 resistance thermal desorption device, 101 heating tank body, 102 inner layer tank body, 103 baffle, 104 vent groove, 105 electrode, 106 extraction pipe, 107 anti-blocking pipe inlet cover, 108 temperature sensor, 2 vent pipe, 3 three-phase separator, 4 condensing device, 5 water storage tank, 6 active carbon adsorption pipe, 7 vacuum pump, 8 micro gas flowmeter, 9PID sensor, 10 dosing pump, 11 dosing barrel, 12 conductivity meter, 13 connecting flange, 14 gas temperature sensor, 15 pressure sensor, 16 flow sensor, 17 electric valve, 18 drain valve, 19 thermometer and 20 throttle valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides an in situ resistance thermal desorption analogue means, includes resistance thermal desorption device 1, ventilation pipe 2, three-phase separator 3, condensing equipment 4, water storage box 5, active carbon adsorption pipe 6, vacuum pump 7, adds medicine pump 10 and adds medicine bucket 11, resistance thermal desorption device 1's top is connected with ventilation pipe 2, extracts through the air after vacuum pump 7 heats soil to the realization is to the restoration of soil, and accomplishes the purification with gas after handling.

Connecting flange 13 is installed to resistance thermal desorption device 1's top intermediate position, connecting flange 13 is gone up and is connected through the income gas port of pipeline with three phase separator 3, install gas temperature sensor 14, pressure sensor 15, flow sensor 16 and motorised valve 17 from left to right in proper order on the pipeline between connecting flange 13 and the three phase separator 3, accomplish the removal to gas and the measurement to data such as temperature.

The gas outlet of three-phase separator 3 passes through the pipeline and is connected with condensing equipment 4, drain valve 18 is installed to condensing equipment 4's bottom, condensing equipment 4 is last to install thermometer 19, condensing equipment 4 passes through pipeline and water storage box 5 intercommunication, water storage box 5 passes through the pipeline and is connected with activated carbon adsorption tube 6, install choke valve 20 on the pipeline between water storage box 5 and the activated carbon adsorption tube 6, activated carbon adsorption tube 6 passes through the pipeline and is connected with vacuum pump 7, install miniature gas flowmeter 8 on the pipeline between activated carbon adsorption tube 6 and the vacuum pump 7, the right side of vacuum pump 7 is given vent to anger the end and is connected with PID sensor 9, extracts gas through vacuum pump 7, drives the purification treatment to gas, reduces the emission of harmful position and the reuse of gas temperature.

Resistance thermal desorption device 1's left side is passed through the pipeline and is connected with dosing pump 10, dosing pump 10's left side is connected with dosing barrel 11, electric conductivity meter 12 is installed at dosing barrel 11's top, electric conductivity meter 12's measuring end is pegged graft in dosing barrel 11's inner chamber, and when dosing barrel 11 was used for neutralizing soil composition, can realize the conductive heating in the soil through the conduction of liquid, the completion is to the thermal treatment of soil.

Resistance thermal desorption device 1 is including heating the jar body 101, the joint has inlayer jar body 102 in the inner chamber of the heating jar body 101, the joint has baffle 103 in the inner chamber of the inlayer jar body 102, the bottom joint of baffle 103 has vent groove 104, and gas through in the soil is after overflowing, takes out through the vent groove 104 of downside, avoids vacuum pump 7 during operation to lead to the jam with the position of soil contact, improves the speed of bleeding.

The utility model discloses a soil gas extraction device, including heating tank body 101, extraction pipe 106, vent groove 104, heating tank body 101, electrode 105, dosing pump 10, extraction pipe 106 and vent groove 104 intercommunication have been pegged graft to the intracavity intermediate position of heating tank body 101, the top left and right sides of heating tank body 101 all installs and prevents stifled pipe inlet cover 107, install temperature sensor 108 on the inner wall of baffle 103, through extraction pipe 106 and vent groove 104 intercommunication, when having avoided blockking up extraction pipe 106, do not influence the quick extraction of soil gas and handle convenient to use.

The top of the resistance thermal desorption device 1 is also provided with an explosion-proof valve, and the explosion-proof valve is positioned in the inner cavity of the connecting flange 13, so that the protection effect is improved.

The inner cavity of the heating tank body 101 is filled with a heat insulation cotton layer, and the inner tank body 102 is positioned in the inner cavity of the heat insulation cotton layer, so that the heat insulation protection effect on the inner tank body 102 is improved.

The quantity of ventilation pipe 2 is two at least, prevent stifled pipe inlet cover 107 including interior sieve screen panel, the outside joint of interior sieve screen panel has outer sieve screen panel, be equipped with soil between interior sieve screen panel and the outer sieve screen panel and accomodate the cavity, the further problem of blockking up appears in the position of ventilation pipe 2 air admission of avoiding appearing.

The condensing device 4 is including arranging spiral condensation nest of tubes about two, two be connected with the breather pipe for recooling between the spiral condensation nest of tubes, the spiral condensation nest of tubes improves the cooling effect including two spiral condenser pipes through the three-way pipe intercommunication.

A ventilation cavity is arranged between the top of the partition plate 103 and the heating tank body 101, ventilation holes are uniformly formed in the outer wall of the electrode 105, the electrode 105 is connected with the ventilation cavity through the ventilation holes, the electrode 105 conducts gas in soil to the ventilation groove 104 through the air cavity by being provided with the ventilation holes while heating the soil and liquid by electrifying, and then the gas is extracted and purified through the extraction pipe 106.

The electrode 105 is made of red copper, and the corrosion resistance of the electrode 105 in direct contact with soil is improved, so that the service life of the electrode 105 is prolonged.

The resistance thermal desorption device 1 is also connected with a real-time data monitoring system through a wire or a wireless communication module, and can detect a plurality of data in the processing process, so that the monitoring data in a plurality of sensors are displayed in the real-time data monitoring system.

The real-time data monitoring system comprises an upper computer control unit and an electric control cabinet control system, wherein the upper computer control unit is electrically and bidirectionally connected with the electric control cabinet control system through a network cable, so that the equipment can be controlled and read on line, data such as temperature, current, voltage and resistance are monitored in real time in the running process of the equipment, and the monitoring effect is improved.

Still be provided with the safety isolation transformer on the resistance thermal desorption device 1, the safety isolation transformer passes through wire and real-time data monitoring system output connection, prevents that accidents such as electric leakage from appearing in the experiment, improve equipment's security.

The working principle is as follows: in the invention, an inner tank body 102 and a partition 103 are arranged in a heating tank body 101, heat insulation cotton is wrapped in the outer tank body, soil to be treated is contained in the partition 103 in the inner layer, the upper part of the inner tank body 102 is sealed by a flange, an electrode 105, an extraction pipe 106 and a ventilation pipe 2 are all arranged on a connecting flange 13 and inserted into the soil in the inner tank body 102, and a temperature sensor 108 is arranged on the inner tank body 102. The device can play the roles of heat preservation and insulation and safety accident prevention, and can also be additionally provided with a lifting system device when large-volume or heavy-mass experimental samples are conveniently replaced. Meanwhile, when the experimental sample needs to be subjected to early treatment such as crushing and stirring, the operation can also be carried out on the inner layer.

Evenly be equipped with the hole on electrode 105, can accomplish drain, electrically conductive when realizing the soil heating, can realize the quick suction upside with inside gas through the air vent to enter into air channel 104 through ventilating cavity department, the rethread is taken out three-phase separator 3, condensing equipment 4 and the active carbon adsorption tube 6 of rear side and is handled through extraction pipe 106, and discharges through vacuum pump 7.

Through being equipped with spiral condenser pipe, drain valve 18 and thermometer 19, the spiral condenser pipe is many, and many spiral condenser pipes are two liang in groups, for the connected mode of adjustable and series connection. After heat exchange, the temperature of the exhaust gas can be changed from high temperature to cooling water temperature, and residual water vapor and system pollutants are liquefied and can be discharged by a set water discharge valve 18. A thermometer 19 is arranged behind the condensing system, and the temperature before and after cooling can be compared to observe the effect.

Through being equipped with dosing bucket 11, dosing pump 10 and conductometer 12, electrode 105 is inside to be equipped with the hole with outside intercommunication, and dosing bucket 11, dosing pump 10 and electrode 105 are inside to be linked together. Electrode 105 is inside to be punched and to increase and add the medicine position, when the attribute of soil is changed to needs, quality of water in adding the explosive barrel is added to the 12 processes of conductivity meter, and the medicine pump that adds explosive barrel 11 the inside to electrode 105 inside with medicine pump 10, the clearing hole diffusion to soil in, experimental result when different medicaments are added in better observation, the internal space of jar has also been practiced thrift simultaneously.

Through being equipped with activated carbon adsorption pipe 6 and PID sensor 9, activated carbon adsorption pipe 6 sets up between condensing equipment 4 and the vacuum pump 7, PID sensor 9 sets up the low reaches at vacuum pump 7, and the tail gas cooling back is taken out under the effect of vacuum pump 7, and tail gas gets into activated carbon adsorption pipe 6, then can use PID sensor 9 to detect tail gas VOC concentration after vacuum pump 7, handles to organize after qualified and discharges.

The gas flow rate can be detected by providing the micro gas flow meter 8.

Through being equipped with water storage tank 5, add water storage device at the equipment rear end, make things convenient for the retaining, water can flow in the active carbon adsorption pipe 6 when the negative pressure is big, consequently can 7 pressures of monitoring control vacuum pump avoid water to the active carbon adsorption pipe 6 in, simultaneously, vapor is in the discharge of water storage tank department can not stop whole machine.

Through being equipped with explosion-proof valve, prevent to lead to forming malleation and constantly increasing pressure in the heating jar body 101 because of reasons such as vapor or rear end pipeline jam in the heating jar body 101, finally take place accident such as fracture, explosion.

In an intermittent heating mode, the extraction negative pressure is-1 KPa, the soil is 100kg, no pollutant is contained, and the water content is maintained at 25-30%, and the temperature of the soil can be raised to 100 ℃ after the heating is carried out for 5 hours.

In an intermittent heating mode, the extraction negative pressure is-1 KPa, the soil moisture content is maintained at 25% -30%, the soil pollutant 1, 2-dichloroethane is aged for 48h, and the superficial layer soil pollutant 1, 2-dichloroethane removal efficiency is 50% after 12h thermal desorption treatment under the set temperature of 72 ℃.

In an intermittent heating mode, the extraction negative pressure is-1 KPa, the soil moisture content is maintained at 25% -30%, the soil pollutant 1, 2-dichloroethane is aged for 48h, and the shallow soil pollutant 1, 2-dichloroethane removal efficiency is 90% after 12h thermal desorption treatment at the set temperature of 95 ℃.

In an intermittent heating mode, the extraction negative pressure is-1 KPa, the soil moisture content is maintained at 25% -30%, the soil pollutant 1, 2-dichloroethane is aged for 48h, and the shallow soil pollutant 1, 2-dichloroethane removal efficiency is 100% after 24h thermal desorption treatment at the set temperature of 95 ℃.

In an intermittent heating mode, the extraction negative pressure is-1 KPa, the soil moisture content is maintained at 25% -30%, the soil pollutant 1, 2-dichloroethane is aged for 48h, and the superficial layer soil pollutant 1, 2-dichloroethane removal efficiency is 100% and the deep layer soil 1, 2-dichloroethane removal efficiency is more than 80% after 12h thermal desorption treatment at the set temperature of 72 ℃.

In an intermittent heating mode, the extraction negative pressure is-1 KPa, the water content of the soil is maintained at 25% -30%, the soil pollutant chlorobenzene is aged for 48h, and the removal rate of the soil pollutant chlorobenzene is over 90% after 24h of thermal desorption treatment at the set temperature of 95 ℃.

While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an in situ resistance thermal desorption analogue means, includes resistance thermal desorption device (1), ventilation pipe (2), three-phase separator (3), condensing equipment (4), water storage box (5), activated carbon adsorption pipe (6), vacuum pump (7), adds medicine pump (10) and adds medicine bucket (11), the top and the ventilation pipe (2) of resistance thermal desorption device (1) are connected, its characterized in that: connecting flange (13) is installed at the top intermediate position of resistance thermal desorption device (1), be connected through the income gas port of pipeline and three-phase separator (3) on connecting flange (13), gas temperature sensor (14), pressure sensor (15), flow sensor (16) and motorised valve (17) from left to right install in proper order on the pipeline between connecting flange (13) and three-phase separator (3), the gas outlet of three-phase separator (3) passes through the pipeline and is connected with condensing equipment (4), drain valve (18) are installed to the bottom of condensing equipment (4), install thermometer (19) on condensing equipment (4), condensing equipment (4) pass through pipeline and water storage box (5) intercommunication, water storage box (5) pass through the pipeline and are connected with active carbon adsorption tube (6), install choke valve (20) on the pipeline between water storage box (5) and active carbon adsorption tube (6), the activated carbon adsorption tube (6) is connected with a vacuum pump (7) through a pipeline, a miniature gas flowmeter (8) is installed on the pipeline between the activated carbon adsorption tube (6) and the vacuum pump (7), the right side gas outlet end of the vacuum pump (7) is connected with a PID sensor (9), the left side of the resistance thermal desorption device (1) is connected with a dosing pump (10) through a pipeline, the left side of the dosing pump (10) is connected with a dosing barrel (11), a conductivity meter (12) is installed at the top of the dosing barrel (11), the measuring end of the conductivity meter (12) is inserted into the inner cavity of the dosing barrel (11), the resistance thermal desorption device (1) comprises a heating tank body (101), an inner layer tank body (102) is clamped in the inner cavity of the heating tank body (101), a partition plate (103) is clamped in the inner cavity of the inner layer tank body (102), and a vent groove (104) is clamped at the bottom of the partition plate (103), the utility model discloses a medicine feeding pump, including heating jar body (101), add the medicine feeding pump (10) and add the medicine feeding pump (105), it has extraction pipe (106) to peg graft in the inner chamber intermediate position of the heating jar body (101), extraction pipe (106) and air channel (104) intercommunication, the top left and right sides of the heating jar body (101) all installs anti-blocking and advances pipe cover (107), install temperature sensor (108) on the inner wall of baffle (103).

2. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: the top of the resistance thermal desorption device (1) is also provided with an explosion-proof valve which is positioned in the inner cavity of the connecting flange (13).

3. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: the inner tank body (102) is positioned in the inner cavity of the heat insulation cotton layer.

4. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: the quantity of ventilation pipe (2) is two at least, prevent that stifled pipe inlet cover (107) is including interior sieve screen panel, the outside joint of interior sieve screen panel has outer sieve screen panel, it accomodates the cavity to be equipped with soil between interior sieve screen panel and the outer sieve screen panel.

5. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: the condensing device (4) comprises two left and right spiral condensing tube groups, wherein a sub-cooling ventilating pipe is connected between the spiral condensing tube groups, and the spiral condensing tube groups comprise two spiral condensing tubes communicated through a three-way pipe.

6. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: a ventilation cavity is arranged between the top of the partition plate (103) and the heating tank body (101), vent holes are uniformly formed in the outer wall of the electrode (105), and the electrode (105) is connected with the ventilation cavity through the vent holes.

7. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: the electrode (105) is made of red copper.

8. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: the resistance thermal desorption device (1) is also connected with a real-time data monitoring system through a lead or a wireless communication module.

9. The in-situ resistive thermal desorption simulation device according to claim 8, wherein: the real-time data monitoring system comprises an upper computer control unit and an electric control cabinet control system, wherein the upper computer control unit is electrically and bidirectionally connected with the electric control cabinet control system through a network cable.

10. The in-situ resistive thermal desorption simulation device according to claim 1, wherein: and a safety isolation transformer is further installed on the resistance thermal desorption device (1), and the safety isolation transformer is in output connection with the real-time data monitoring system through a wire.