CN211757580U - Contaminated soil heat treatment device - Google Patents
Contaminated soil heat treatment device Download PDFInfo
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- CN211757580U CN211757580U CN201922489793.9U CN201922489793U CN211757580U CN 211757580 U CN211757580 U CN 211757580U CN 201922489793 U CN201922489793 U CN 201922489793U CN 211757580 U CN211757580 U CN 211757580U
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Abstract
The application provides a contaminated soil heat treatment device. A contaminated soil heat treatment apparatus includes a heat treatment system including a heat treatment reactor and a thermal energy supplier; the heat treatment reactor is provided with the treatment chamber and pollutes soil inlet, clean soil outlet, hot gas inlet and tail gas export, pollute soil inlet with the tail gas export sets up the head end of treatment chamber, the hot gas inlet with clean soil outlet sets up the tail end of treatment chamber, the heat energy supplier with hot gas inlet intercommunication. The application provides a pollute soil heat treatment device, the energy consumption is low, and the treatment effeciency is high.
Description
Technical Field
The application relates to the field of soil treatment, in particular to a contaminated soil heat treatment device.
Background
The contaminated soil heat treatment technology refers to a process of heating a contaminated medium and contaminants contained therein to a sufficient temperature by direct or indirect heat exchange so that the contaminants are volatilized or separated from the contaminated medium. The heating method in the heat treatment technology is various, such as high-frequency current, microwave, superheated air, combustion gas and the like. The heating temperature is controlled at 200-800 ℃, evaporation, distillation, boiling, oxidation, pyrolysis and other effects occur in the treatment process, and different pollutants can be selectively removed by adjusting the temperature. Part of organic matters in the soil are decomposed at high temperature, and the rest of undecomposed pollutants are separated from the soil under the negative pressure condition and finally are completely eliminated in ground treatment facilities (a post combustor, a concentrator or an activated carbon adsorption device and the like). The technology has certain requirements on the particle size and the water content of the treated soil, and the soil is generally required to be pretreated; there is a risk of generating dioxins. The thermal desorption repair process is typically performed on site by a mobile unit, and the desorbed products are subsequently processed because the desorption process is less damaging to the contaminants.
The heat treatment repair technology has the advantages of simple process, mature technology and the like, but the existing device has large energy consumption and high operation cost.
SUMMERY OF THE UTILITY MODEL
The application provides a contaminated soil heat treatment device to solve the above-mentioned problem.
In order to solve the above problems, the present application adopts the following technical solutions:
a contaminated soil heat treatment apparatus comprising a heat treatment system comprising a heat treatment reactor and a thermal energy supply;
the heat treatment reactor is provided with a treatment cavity, a contaminated soil inlet, a clean soil outlet, a hot gas inlet and a tail gas outlet, the contaminated soil inlet and the tail gas outlet are arranged at the head end of the treatment cavity, and the hot gas inlet and the clean soil outlet are arranged at the tail end of the treatment cavity;
the thermal energy supply is in communication with the hot gas inlet.
Preferably, the contaminated soil heat treatment device further comprises a tail gas treatment system, wherein the tail gas treatment system comprises a first dust remover, a second combustion chamber, a quenching tower, a mixing chamber, a second dust remover, a spray tower, an adsorption tank and a chimney which are connected in sequence; the first dust remover is communicated with the tail gas outlet, the secondary combustion chamber is used for carrying out secondary combustion treatment on the tail gas from the first dust remover, the quenching tower is used for carrying out quenching treatment on the gas from the secondary combustion chamber, the mixing chamber is used for removing dioxin and sulfide in the gas from the quenching tower, the second dust remover is used for removing fly ash from the mixing chamber, the spray tower is used for spraying alkali liquor or water, the adsorption tank is used for adsorbing pollutants in the gas from the spray tower, and the chimney is used for high-altitude emission of the tail gas.
Further preferably, first dust remover with be provided with first draught fan between the second combustion chamber, the adsorption tank with be provided with the second draught fan between the chimney, first dust remover with be provided with the return air branch pipe on the pipeline between the first draught fan, the return air branch pipe with heat energy supplier intercommunication, be provided with the third draught fan on the return air branch pipe.
Preferably, a heat exchanger is arranged between the secondary combustion chamber and the quenching tower, and the heat exchanger is used for preheating combustion-supporting gas input into the secondary combustion chamber.
Preferably, the contaminated soil heat treatment apparatus further comprises a pretreatment system including a second screw conveyor for feeding contaminated soil into the contaminated soil inlet;
preferably, the second screw conveyer is provided with a second jacketed heat exchanger, the second jacketed heat exchanger is provided with a tail gas inlet and a heat exchange tail gas outlet, the tail gas inlet is communicated with the second dust remover, and the heat exchange tail gas outlet is communicated with the spray tower.
Preferably, a fourth induced draft fan is arranged between the heat exchange tail gas outlet and the spray tower, and the spray tower is provided with a circulating pump for circulating the alkali liquor or the water.
Preferably, the pretreatment system further comprises a screen crusher for crushing, screening and feeding the contaminated soil into the second screw conveyor, and an oversize conveyor belt for conveying the oversize from the screen crusher.
Preferably, the thermal treatment system further comprises a first screw conveyor for transferring cleaned soil from the cleaned soil outlet;
preferably, the first screw conveyer is provided with a first jacketed heat exchanger, the first jacketed heat exchanger is provided with a hot air outlet and a fresh air inlet for inputting fresh air, and the hot air outlet is communicated with a combustion-supporting gas inlet of the heat energy supplier.
Compared with the prior art, the beneficial effect of this application includes:
the application provides a pollute soil heat treatment device adopts and pollutes soil entry and tail gas outlet setting at the head end of treatment chamber, and hot gas entry and clean soil outlet set up the tail end at the treatment chamber for the direction of motion of the hot gas that comes from the heat energy supply ware is opposite with the direction of motion that pollutes soil, improves the treatment effeciency, reduces the energy consumption, makes and pollutes soil and can obtain effective processing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows a contaminated soil heat-treating apparatus provided in example 1;
FIG. 2 shows a contaminated soil heat-treating apparatus provided in example 2;
FIG. 3 shows a contaminated soil heat-treating apparatus provided in example 3;
fig. 4 shows the contaminated soil heat treatment apparatus provided in example 4.
Description of the main element symbols:
1-heat treatment reactor; 2-a thermal energy supplier; 3-entrance of polluted soil; 4-cleaning soil outlet; 5-a hot gas inlet; 6-tail gas outlet; 7-a first screw conveyor; 8-a first jacketed heat exchanger; 9-hot air outlet; 10-fresh air inlet; 11-combustion supporting gas inlet; 12-a first dust separator; 13-a second combustion chamber; 14-a quench tower; 15-a mixing chamber; 16-a second precipitator; 17-a spray tower; 18-an adsorption tank; 19-a chimney; 20-a heat exchanger; 21-a first induced draft fan; 22-a second induced draft fan; 23-return air branch pipe; 24-a third induced draft fan; 25-a circulation pump; 26-a second screw conveyor; 27-a second jacketed heat exchanger; 28-tail gas inlet; 29-heat exchange tail gas outlet; 30-a fourth induced draft fan; 31-a screening crusher; 32-oversize conveyor belt.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Example 1
Referring to fig. 1, a contaminated soil heat treatment apparatus includes a heat treatment system including a heat treatment reactor 1 and a heat energy supplier 2; the heat treatment reactor 1 is provided with a contaminated soil inlet 3, a clean soil outlet 4, a hot gas inlet 5 and a tail gas outlet 6; contaminated soil entry 3 is used for the input contaminated soil, and clean soil export 4 is used for exporting clean soil, and contaminated soil entry 3 and tail gas export 6 set up the head end at the treatment chamber, and hot gas entry 5 sets up the tail end at the treatment chamber with clean soil export 4, and heat energy supply ware 2 communicates with hot gas entry 5. The polluted soil moves in a reverse direction with the hot gas, the hot gas heats the polluted soil, the heat efficiency is higher, and the energy consumption is greatly reduced; evaporation, distillation, boiling, oxidation and pyrolysis occur in the heat treatment reactor 1, and different pollutants can be selectively removed by adjusting the temperature. Part of organic matters in the soil are decomposed at high temperature, and the rest pollutants which cannot be decomposed are separated from the soil under the negative pressure condition and are finally completely eliminated in ground treatment facilities.
In an alternative embodiment, the thermal treatment reactor 1 may be provided with a plurality of reactors connected in series in order to further improve the treatment efficiency.
The fuel of the heat energy supplier 2 can be natural gas, gasoline and other common fuels, and the combustion-supporting gas is air.
When the polluted soil is treated, the polluted soil enters the heat treatment reactor 1 from the polluted soil inlet 3, is subjected to heating reaction and then is output from the clean soil outlet 4 (solid arrows in the figure 1 indicate the soil trend), hot gas generated by the heat energy supplier 2 enters the heat treatment reactor 1 from the hot gas inlet 5 to heat the polluted gas, and then tail gas is discharged from the tail gas outlet 6 (dotted arrows in the figure 1 indicate the hot gas trend).
The temperature of the hot gas is 700 ℃, the temperature of the polluted soil in the heat treatment reactor 1 is controlled to be 200 ℃, and the treatment time is 120 min.
In other embodiments, the temperature of the hot gas may be any value between 800 ℃, 900 ℃ or 700-900 ℃, the temperature of the contaminated soil in the heat treatment reactor 1 is controlled to be any value between 600 ℃ or 200-600 ℃, and the treatment time is controlled to be any value between 20min or 20-120 min.
Example 2
Referring to fig. 2, on the basis of embodiment 1, in order to further improve the thermal efficiency, the thermal treatment system further includes a first screw conveyor 7, the first screw conveyor 7 is used for transferring clean soil from the clean soil outlet 4, the first screw conveyor 7 is provided with a first jacketed heat exchanger 8, the first jacketed heat exchanger 8 is provided with a hot air outlet 9 and a fresh air inlet 10 for inputting fresh air, and the hot air outlet 9 is communicated with a combustion-supporting gas inlet 11 of the thermal energy supplier 2.
The treated clean soil is discharged from the clean soil outlet 4 and enters the first screw conveyor 7, fresh air enters the first jacketed heat exchanger 8 from the fresh air inlet 10, and after heat exchange is carried out between the fresh air and the clean soil, the fresh air enters the heat energy supplier 2 through the hot air outlet 9 and the combustion-supporting gas inlet 11.
Example 3
As shown in fig. 3, on the basis of embodiment 2, the contaminated soil heat treatment apparatus further comprises a tail gas treatment system, wherein the tail gas treatment system comprises a first dust remover 12, a second combustion chamber 13, a quench tower 14, a mixing chamber 15, a second dust remover 16, a spray tower 17, an adsorption tank 18 and a chimney 19 which are connected in sequence; the first dust remover 12 is communicated with the tail gas outlet 6 to remove the particulate matters in the tail gas of the heat treatment reactor 1; the secondary combustion chamber 13 carries out secondary combustion treatment on the tail gas from the first dust remover 12, the combustion-supporting gas is natural gas and air, and the temperature of the secondary combustion can be selectively controlled between 800 ℃ and 1100 ℃ according to requirements; the quenching tower 14 carries out quenching treatment on the tail gas of the secondary combustion chamber 13, so as to prevent the formation of dioxin in the tail gas temperature reduction process, and the temperature of the tail gas after quenching treatment is reduced to 200 ℃ or below; the mixing chamber 15 is used for adding lime and active carbon into the tail gas to remove dioxin and sulfide in the tail gas; the second dust collector 16 is for removing fly ash from the mixing chamber 15; the spray tower 17 sprays alkali liquor or water for removing organic matters and sulfides in the tail gas and further reducing the temperature of the tail gas; the adsorption tank 18 is used for adsorbing pollutants in the gas from the spray tower 17, and the chimney 19 is used for high-altitude exhaust of tail gas.
In order to further improve the thermal efficiency, in a preferred embodiment, a heat exchanger 20 is arranged between the secondary combustion chamber 13 and the quenching tower 14, and the heat exchanger 20 preheats combustion-supporting gas used by the secondary combustion chamber 13.
In order to improve the treatment efficiency, in a preferred embodiment, a first induced draft fan 21 is arranged between the first dust remover 12 and the second combustion chamber 13, a second induced draft fan 22 is arranged between the adsorption tank 18 and the chimney 19, a return air branch pipe 23 is arranged on a pipeline between the first dust remover 12 and the first induced draft fan 21, the return air branch pipe 23 is communicated with the heat energy supplier 2, and a third induced draft fan 24 is arranged on the return air branch pipe 23.
In order to improve the efficiency of the spraying treatment, the spraying tower 17 is provided with a circulating pump 25, and the spraying liquid is discharged for sewage treatment after being sprayed for a period of time in a circulating manner.
In alternative embodiments, the number of canisters 18 may be multiple, such as 2, 3, 4, etc., depending on the actual process requirements.
The polluted soil entering the heat treatment reactor 1 reacts with hot gas from the heat energy supplier 2, tail gas is discharged from a tail gas outlet 6, a part of the tail gas after entering the first dust remover 12 for dust removal returns to the heat energy supplier 2 through a return air branch pipe 23 under the action of a third induced draft fan 24, the other part of the tail gas enters the secondary combustion chamber 13 for combustion under the action of a first induced draft fan 21, the combusted tail gas enters the quenching tower 14 for quenching treatment after heat exchange through a heat exchanger 20, then is sent into a mixing chamber 15 for removing dioxin and sulfide in the tail gas, then enters the second dust remover 16 for dust removal, and then the spraying tower 17 sprays alkali liquor or water for removing organic matters and sulfide in the tail gas and further reducing the temperature of the tail gas; the tail gas enters the adsorption tank 18 to further remove pollutants in the tail gas, the tail gas is ensured to be discharged up to the standard, and finally the tail gas is discharged in the high altitude through a chimney under the action of the second induced draft fan 22.
Example 4
As shown in fig. 4, in addition to example 3, in order to further improve the treatment efficiency of the apparatus, the contaminated soil heat treatment apparatus further includes a pretreatment system including a second screw conveyor 26, and the second screw conveyor 26 is used to feed the contaminated soil into the contaminated soil inlet 3.
In order to further improve the thermal efficiency of the device and reduce the energy consumption, in an alternative embodiment, the second screw conveyor 26 is provided with a second jacketed heat exchanger 27, the second jacketed heat exchanger 27 is provided with a tail gas inlet 28 and a heat exchange tail gas outlet 29, the tail gas inlet 28 is communicated with the second dust remover 16, and the heat exchange tail gas outlet 29 is communicated with the spray tower 17.
The tail gas output from the second dust collector 16 has a certain amount of heat, and enters the second jacketed heat exchanger 27 to exchange heat with the contaminated soil, so that the contaminated soil can be preheated and the tail gas can be cooled.
In order to further improve the treatment efficiency, a fourth induced draft fan 30 is arranged between the heat exchange tail gas outlet 29 and the spray tower 17.
In order to ensure the effect of heat treatment, the pretreatment system further comprises a screening crusher 31 and an oversize material conveying belt 32, wherein the screening crusher 31 is used for crushing and screening the polluted soil and conveying the polluted soil into the second screw conveyor 26, the particle size of the crushed and screened polluted soil is less than or equal to 3cm, and the water content of the crushed and screened polluted soil is less than or equal to 22% after heat exchange through the second jacketed heat exchanger 27; the oversize conveyor belt 32 is used to convey oversize from the screen crusher 31.
The device provided in example 4 was used to perform 3 contaminated soil treatment tests, and the relevant contaminant indicators before and after treatment were detected, as shown in table 1 below:
TABLE 1 test results
As can be seen from Table 1, the treated soil has a significantly reduced pollutant content and is far below the standard value.
According to the contaminated soil heat treatment device, contaminated soil is subjected to crushing and screening pretreatment through the pretreatment system, and meanwhile, the contaminated soil is preheated by utilizing heat treatment tail gas to reduce the water content of the soil, so that the contaminated soil with fine particles and low water content is ensured to enter the heat treatment reactor 1; the pretreated polluted soil is treated by the multistage heat treatment reactor 1 and then discharged by the second screw conveyor 26, so that the treatment effect of the polluted soil is ensured; the heat treatment tail gas is removed dust through first dust remover 12, and the organic pollutant is fully burnt in second combustion chamber 13, and 14 quench tower quench second combustion chamber tail gases prevent that the dioxin from forming in a large number, and mixing chamber 15 adds lime and active carbon and gets rid of dioxin and sulphide in the tail gas, and organic pollutant and sulphide in the tail gas are got rid of to spray column 17, reduce the tail gas temperature simultaneously, and adsorption tank 18 further reduces organic pollutant in the tail gas, ensures that heat treatment tail gas emission up to standard.
The method can effectively treat the polluted soil, remove various volatile or semi-volatile organic pollutants in the polluted site, has the pollutant removal rate of over 99.98 percent, and effectively purifies the thermal desorption tail gas; meanwhile, the heat source is fully utilized, and the energy consumption is reduced. The energy consumption of the polluted soil heat treatment device provided by the application is calculated as follows: 20-30m for treating each ton of polluted soil3Natural gas. And the conventional indirect thermal desorption energy consumption is as follows: 35-45m for treating each ton of polluted soil3Natural gas.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A contaminated soil heat treatment apparatus, comprising a heat treatment system comprising a heat treatment reactor and a thermal energy supplier;
the heat treatment reactor is provided with a treatment cavity, a contaminated soil inlet, a clean soil outlet, a hot gas inlet and a tail gas outlet, the contaminated soil inlet and the tail gas outlet are arranged at the head end of the treatment cavity, and the hot gas inlet and the clean soil outlet are arranged at the tail end of the treatment cavity;
the thermal energy supply is in communication with the hot gas inlet.
2. The contaminated soil heat treatment apparatus according to claim 1, further comprising a tail gas treatment system, wherein the tail gas treatment system comprises a first dust collector, a second combustion chamber, a quench tower, a mixing chamber, a second dust collector, a spray tower, an adsorption tank and a chimney, which are connected in sequence; the first dust remover is communicated with the tail gas outlet, the secondary combustion chamber is used for carrying out secondary combustion treatment on the tail gas from the first dust remover, the quenching tower is used for carrying out quenching treatment on the gas from the secondary combustion chamber, the mixing chamber is used for removing dioxin and sulfide in the gas from the quenching tower, the second dust remover is used for removing fly ash from the mixing chamber, the spray tower is used for spraying alkali liquor or water, the adsorption tank is used for adsorbing pollutants in the gas from the spray tower, and the chimney is used for high-altitude emission of the tail gas.
3. The contaminated soil heat treatment apparatus according to claim 2, wherein a first induced draft fan is provided between the first dust collector and the second combustion chamber, a second induced draft fan is provided between the adsorption tank and the chimney, a return air branch pipe is provided on a pipeline between the first dust collector and the first induced draft fan, the return air branch pipe is communicated with the heat energy supplier, and a third induced draft fan is provided on the return air branch pipe.
4. The contaminated soil heat treatment apparatus according to claim 2, wherein a heat exchanger is provided between the secondary combustion chamber and the quenching tower, and the heat exchanger is used for preheating combustion-supporting gas to be supplied to the secondary combustion chamber.
5. The contaminated soil thermal treatment apparatus according to claim 2, further comprising a pre-treatment system including a second screw conveyor for feeding contaminated soil into the contaminated soil inlet.
6. The contaminated soil thermal treatment apparatus according to claim 5, wherein the second screw conveyor is provided with a second jacketed heat exchanger provided with a tail gas inlet communicating with the second dust collector and a heat exchange tail gas outlet communicating with the spray tower.
7. The contaminated soil heat treatment apparatus according to claim 6, wherein a fourth induced draft fan is provided between the heat exchange tail gas outlet and the spray tower, and the spray tower is provided with a circulation pump for circulating the alkali liquor or water.
8. The contaminated soil thermal treatment apparatus according to claim 5, wherein the pretreatment system further comprises a screen crusher for crushing, screening and feeding the contaminated soil to the second screw conveyor, and an oversize conveyor belt for conveying the oversize from the screen crusher.
9. The contaminated soil thermal treatment apparatus of any of claims 1-8, wherein the thermal treatment system further comprises a first screw conveyor for transferring cleaned soil from the cleaned soil outlet.
10. The contaminated soil thermal treatment apparatus according to claim 9, wherein the first screw conveyor is provided with a first jacketed heat exchanger provided with a hot air outlet in communication with a combustion-supporting gas inlet of the thermal energy supplier and a fresh air inlet for inputting fresh air.
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| CN201922489793.9U CN211757580U (en) | 2019-12-31 | 2019-12-31 | Contaminated soil heat treatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111069263A (en) * | 2019-12-31 | 2020-04-28 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Contaminated soil heat treatment device and contaminated soil heat treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111069263A (en) * | 2019-12-31 | 2020-04-28 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Contaminated soil heat treatment device and contaminated soil heat treatment method |
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