CN211321535U - In-situ thermal desorption integrated heating device - Google Patents
In-situ thermal desorption integrated heating device Download PDFInfo
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- CN211321535U CN211321535U CN201922127051.1U CN201922127051U CN211321535U CN 211321535 U CN211321535 U CN 211321535U CN 201922127051 U CN201922127051 U CN 201922127051U CN 211321535 U CN211321535 U CN 211321535U
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Abstract
The utility model provides an integrated heating device of normal position thermal desorption, it includes the sealed metal sleeve in bottom and arranges the intraductal heating rod of metal sleeve in, metal sleeve can be connected to the power through the ERH cable, the heating rod can be connected to the power through the TCH cable. The utility model realizes the integration of ERH and TCH heating processes, and can realize two heating processes in one heating well; the two heating modes are combined, so that the problem that the removal efficiency cannot be achieved by using ERH only and the problem that the energy consumption is too high by using TCH only are avoided; the heating period is shortened on the whole, and the heating efficiency is improved.
Description
Technical Field
The utility model relates to a normal position thermal desorption heating device.
Background
Resistive Heating (ERH) and conductive heating (TCH) are two important ways of in situ thermal desorption techniques. ERH depends on current flowing between electrodes, joule heat is generated by the resistance of soil to heat soil, the heating mode takes soil 'spontaneous heating' as the main part, heat conduction as the auxiliary part, high-power input can be allowed, the integral heating speed is higher, and the heating effect of a heating area is more uniform and synchronous; the TCH is heated by the heating element to generate a temperature gradient, and the surrounding soil is heated mainly by heat conduction, so that the allowable highest input power is relatively low, the overall heating speed is low, and the temperature difference of a heating area is large;
from the heating temperature, the maximum heating temperature of ERH is 100-120 ℃, and the maximum heating temperature of TCH can reach 300-500 ℃ or even higher; thus, ERH is suitable for treating Volatile Organic Contaminants (VOCs) with lower boiling points, while TCH can treat not only VOCs but also semi-volatile organic contaminants (SVOCs) with higher boiling points and polychlorinated biphenyls (PCBs), etc.
From the influence of the soil moisture content on the heating effect, for ERH, certain soil moisture content needs to be maintained to ensure that a circuit is smooth due to current conduction in soil, and if the soil moisture content is too low, water needs to be added to adjust the soil moisture; for TCH, the specific heat of water is far greater than that of soil, the water content of the soil is too high, too much unnecessary energy is wasted, and the lower the water content of the soil is, the better the TCH is.
In the actual field pollution treatment process, due to the complexity of hydrogeology and the diversity of pollutant types, an ideal restoration effect is difficult to achieve by applying a single in-situ thermal desorption technology, and the problems of low restoration efficiency or high energy consumption and the like are caused. Therefore, it is urgently needed to develop a more efficient and energy-saving in-situ thermal desorption device.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an integrated heating device of normal position thermal desorption, integrate the advantage of resistance heating (ERH) and heat-conduction heating (TCH) into one body to compensate respective disappearance and not enough.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides an integrated heating device of normal position thermal desorption which characterized in that: including the sealed metal casing in bottom and arrange the heating rod in the metal casing in, the metal casing can be connected to the power through the ERH cable, the heating rod can be connected to the power through the TCH cable.
The integrated heating device of normal position thermal desorption, wherein: the TCH cable and the ERH cable are in switching communication with the power supply through a switch.
The integrated heating device of normal position thermal desorption, wherein: the power supply is one phase of three-phase four-wire alternating current.
The integrated heating device of normal position thermal desorption, wherein: the heating rod is composed of a sealed waterproof metal tube and a resistance wire arranged in the metal tube, one end of the resistance wire is led out from the metal tube and connected with the TCH cable, and the other end of the resistance wire is in conductive connection with the metal tube.
The integrated heating device of normal position thermal desorption, wherein: the gap between the heating rod and the metal sleeve is filled with one or more holders.
The integrated heating device of normal position thermal desorption, wherein: a plurality of heating rods are arranged in a metal sleeve, adjacent heating rods are connected through hollow connecting rods, and adjacent heating rods are connected through electric wires penetrating through the inner parts of the connecting rods to form series connection and/or parallel connection.
The integrated heating device of normal position thermal desorption, wherein: both ends of the connecting rod are connected with the end part of the heating rod through threads.
The integrated heating device of normal position thermal desorption, wherein: the top of the metal sleeve is provided with a detachable flange cover, so that the heating rod can be pulled out of the metal sleeve.
The integrated heating device of normal position thermal desorption, wherein: and the flange cover is provided with cable through holes for the ERH cable and/or the TCH cable to pass through.
Therefore, the utility model discloses the beneficial effect who brings is:
(1) the integration of ERH and TCH heating processes is realized, and two heating processes can be realized in one heating well;
(2) in the initial heating stage, the soil moisture content is relatively high, which is beneficial to adopting a low-voltage high-current ERH operation mode, maintaining higher input power, quickly heating the soil, shortening the heating time and reducing the heat loss; the purpose of removing VOCs can be achieved at this stage;
(3) in the later heating stage, particularly for the aeration zone, the water content of the soil is reduced to a certain level, in order to ensure the smoothness of a circuit, if an ERH process is continuously used, water needs to be frequently added into the electrodes, and the added water is heated, so that the overall heating energy consumption is increased; at the moment, the TCH heating mode is started, the water content of the soil is low, the soil heating and the thermal field expansion are facilitated, the heating time is shortened, and the purpose of removing SVOCs can be achieved at this stage;
(4) the two heating modes are combined, so that the problem that the removal efficiency cannot be achieved by using ERH only and the problem that the energy consumption is too high by using TCH only are avoided; the heating period is shortened on the whole, and the heating efficiency is improved.
(5) In addition, the heating rod and the metal sleeve are installed in a pull-plug mode, so that the heating rod is convenient to overhaul, recover and reuse; preferably, the heating rods are made as "standard parts" so as to be combined according to different treatment depth requirements;
(6) the heating rod can be spliced with the heating rod, and the surface temperature of the heating rod can be adjusted through the density of the resistance wires; therefore, different heating temperatures can be set conveniently according to different boiling point pollutants distributed in the stratum, and accurate heating is carried out so as to further reduce heating energy consumption.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic overall structure diagram of another embodiment of the present invention;
FIG. 3 is a schematic structural view of the connecting rod;
FIG. 4 is a schematic view of a cable perforation arrangement on the flange cover;
fig. 5 and 6 are schematic diagrams of two application examples of the present invention (thick arrows indicate TCH heating, and broken thin arrows indicate ERH heating).
Detailed Description
Some specific embodiments of the invention will be described in detail below, by way of example and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale.
As shown in fig. 1, the present invention provides an energy-efficient in-situ thermal desorption integrated heating apparatus, which includes a metal sleeve 1 with a sealed bottom end and a heating rod 2 coaxially disposed in the center of the metal sleeve 1, wherein a gap between the heating rod 2 and the metal sleeve 1 is filled with one or more holders 3 to fix the position of the heating rod 2 and ensure that it is located in the center of the metal sleeve 1;
the heating rod 2 consists of a closed waterproof metal tube 21 and a resistance wire 22 (in a coil form) arranged in the metal tube 21, one end of the resistance wire 22 is led out from the top of the metal tube 21 and is connected with a TCH cable 41, and the other end of the resistance wire is in conductive connection with the metal tube 21;
the top end of the metal sleeve 1 is a flange, two cable through holes 11 (fig. 4) are arranged on the flange, the TCH cable 41 penetrates out from one cable through hole 11, the ERH cable 42 penetrates into the other cable through hole 11 and is in conductive connection with the metal sleeve 1, and the TCH cable 41 and the ERH cable 42 are in switching communication with a power supply through a selector switch 5; preferably, the power source is one phase of a three-phase four-wire alternating current.
When the change-over switch 5 is connected with the TCH cable 41, the resistance wire 22 in the heating rod 2 starts to heat, so that the TCH heating function can be realized, and the soil is heated to a higher temperature, so as to achieve the purpose of removing the high-boiling-point SVOCs; when the change-over switch 5 is connected with the metal sleeves 1, the ERH heating function can be realized between the adjacent metal sleeves 1, and the soil is heated to within 100 ℃ so as to achieve the purpose of removing VOCs.
The heating power of the heating rod 2 can be adjusted by the density of the resistance wire 22 (the number of turns of the coil), the tighter the resistance wire 22 is, the higher the heating power of the heating rod 2 is, and the higher the surface temperature of the metal sleeve 1 in the corresponding area of the heating rod 2 is under the same voltage, and vice versa;
as shown in fig. 2, a plurality of heating rods 2 can be placed in one metal sleeve 1, adjacent heating rods 2 are connected by hollow connecting rods 7, and external threads are arranged at two ends of each connecting rod 7 (see fig. 3) and can be correspondingly combined with internal threads at the end parts of the heating rods 2, so that the connection and the disassembly are convenient; the resistance wire 22 penetrates through the connecting rod 7, and the series connection and/or the parallel connection between the adjacent heating rods 2 can be realized; the heating rods 2 with corresponding specifications can be installed in the metal sleeve 1 according to the stratum distribution characteristics of pollutants with different boiling points by adopting the series-parallel connection structure of the heating rods 2, so that the 'accurate heating' of pollutants with different stratums and different boiling points is realized, and the heating efficiency is improved.
The used heating rod 2 can be pulled out of the metal sleeve 1, so that the heating rod 2 can be conveniently installed and recovered; the shell of the heating rod 2 and the resistance wire 22 are made of precious alloy, the recovery value is high, the metal sleeve 1 is made of a common carbon tube, the recovery value is low, and recovery is not needed.
Application example 1 (situation of various pollutants)
For coking pollution sites, the typical pollution is Polycyclic Aromatic Hydrocarbons (PAHs) and benzene series (BTEX), the polycyclic aromatic hydrocarbons belong to SVOCs, have high boiling points, are easily adsorbed by soil particles due to large molecular weight, are mainly and intensively distributed on the surface layer, and have relatively low water content; most benzene series belong to VOCs, have relatively small molecular weight, are easy to migrate, are mostly concentrated in deep layers, and have relatively high soil moisture content.
Therefore, in the repairing process, aiming at the distribution characteristics of pollutants, as shown in fig. 5, the heating rod 2 is installed at the upper part of the metal sleeve 1, an ERH heating process can be firstly adopted to remove benzene series in the deep layer and the surface layer by using the ERH process, and meanwhile, the water content of surface soil can be reduced; then, further removing SOVCS on the surface layer by using a TCH process; thereby achieving the purpose of energy-saving, high-efficiency and quick repair.
Application example 2 (hydrogeology complex situation)
A site has trichloroethane leakage and obvious DNAPL (Dense Non Aqueous Phase Liquid) areas are formed in cracks of a clay layer and a basal layer respectively; although ERH can effectively heat the clay layers, it is difficult for the bedrock formation to heat the bedrock formation due to the low porosity and poor electrical conductivity of the bedrock.
Therefore, in the repairing process, for the distribution characteristics of the pollutants, as shown in fig. 6, ERH and TCH can be respectively used to effectively heat the clay layer and the basal rock layer so as to effectively remove DNAPL.
Therefore, the utility model discloses the beneficial effect who brings is:
(1) the integration of ERH and TCH heating processes is realized, and two heating processes can be realized in one heating well;
(2) in the initial heating stage, the soil moisture content is relatively high, which is beneficial to the electrode to input high current into the soil, and maintain higher input power, so that the soil energy consumption is quickly increased, the heating time is shortened, and the heat loss is reduced; the purpose of removing VOCs can be achieved at this stage;
(3) in the later heating stage, particularly for the aeration zone, the water content of the soil is reduced to a certain level, in order to ensure the smoothness of a circuit, if an ERH process is continuously used, water needs to be frequently added into the electrodes, and the added water is heated, so that the overall heating energy consumption is increased; at the moment, the TCH heating mode is started, the water content of the soil is low, the soil heating and the thermal field expansion are facilitated, the heating time is shortened, and the purpose of removing SVOCs can be achieved at this stage;
(4) the two heating modes are combined, so that the problem that the removal efficiency cannot be achieved by using ERH only and the problem that the energy consumption is too high by using TCH only are avoided; the heating period is shortened on the whole, and the heating efficiency is improved.
(5) In addition, the heating rod 2 and the metal sleeve 1 are installed in a plug-in mode, so that the metal sleeve is convenient to overhaul, recover and recycle; the heating rod 2 is easy to manufacture into a standard part and is convenient to combine according to the requirement;
(6) the heating rod 2 and the heating rod 2 can be spliced, and the surface temperature of the heating rod 2 can be adjusted according to the density of the resistance wires 22; therefore, different heating temperatures can be set conveniently according to different boiling point pollutants distributed in the stratum, and accurate heating is carried out so as to further reduce heating energy consumption.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides an integrated heating device of normal position thermal desorption which characterized in that: including the sealed metal casing in bottom and arrange the heating rod in the metal casing in, the metal casing can be connected to the power through the ERH cable, the heating rod can be connected to the power through the TCH cable.
2. The in-situ thermal desorption integrated heating device of claim 1, wherein: the TCH cable and the ERH cable are in switching communication with the power supply through a switch.
3. The in-situ thermal desorption integrated heating device of claim 1, wherein: the power supply is one phase of three-phase four-wire alternating current.
4. The in-situ thermal desorption integrated heating device of claim 1, wherein: the heating rod is composed of a sealed waterproof metal tube and a resistance wire arranged in the metal tube, one end of the resistance wire is led out from the metal tube and connected with the TCH cable, and the other end of the resistance wire is in conductive connection with the metal tube.
5. The in-situ thermal desorption integrated heating device of claim 1, wherein: the gap between the heating rod and the metal sleeve is filled with one or more holders.
6. The in-situ thermal desorption integrated heating device of claim 1, wherein: a plurality of heating rods are arranged in a metal sleeve, adjacent heating rods are connected through hollow connecting rods, and adjacent heating rods are connected through electric wires penetrating through the inner parts of the connecting rods to form series connection and/or parallel connection.
7. The in-situ thermal desorption integrated heating device of claim 6, wherein: both ends of the connecting rod are connected with the end part of the heating rod through threads.
8. The in-situ thermal desorption integrated heating device of claim 1, wherein: the top of the metal sleeve is provided with a detachable flange cover, so that the heating rod can be pulled out of the metal sleeve.
9. The in-situ thermal desorption integrated heating device of claim 8, wherein: and the flange cover is provided with cable through holes for the ERH cable and/or the TCH cable to pass through.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922127051.1U CN211321535U (en) | 2019-12-02 | 2019-12-02 | In-situ thermal desorption integrated heating device |
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| CN201922127051.1U CN211321535U (en) | 2019-12-02 | 2019-12-02 | In-situ thermal desorption integrated heating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110996417A (en) * | 2019-12-02 | 2020-04-10 | 中科鼎实环境工程有限公司 | In-situ thermal desorption integrated heating device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110996417A (en) * | 2019-12-02 | 2020-04-10 | 中科鼎实环境工程有限公司 | In-situ thermal desorption integrated heating device and method |
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