US10518303B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10518303-B2 |
| Application number | US-201816096289-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 6, 2018 |
| Priority date | Feb 20, 2017 |
| Publication date | Dec 31, 2019 |
| Grant date | Dec 31, 2019 |
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Disclosed are a thermal desorption system for oil-contaminated soil and gravel, using a microwave indirect irradiation method and including a microwave emission prevention device and a preheating device using waste heat, and a thermal desorption method for oil-contaminated soil and gravel, using the same. In addition, it is disclosed that an outer tube encompassing an inner tube extends to both sides and a plurality of ring-shaped microwave attenuation units are arranged on the inner circumferential surface of the outer tube, such that microwaves are prevented from leaking between the inner tube and the outer tube, thereby enabling eco-friendliness, and even the waste heat generated during a pollutant desorption process is utilized in the system itself, thereby enabling economic feasibility to increase further.
Opening claim text (preview).
The invention claimed is: 1. An oil-contaminated soil and gravel thermal desorption system using a microwave indirect irradiation method comprising: a storage part in which contaminated soil and gravel are stored; a conveying part configured to introduce the contaminated soil and gravel of the storage part into a contaminant desorbing part; the contaminant desorbing part configured to desorb contaminants from the contaminated soil and gravel conveyed by the conveying part by heat, including an inlet through which the contaminated soil and gravel are introduced, a treatment section in which the contaminated soil and gravel are subjected to thermal desorption treatment, and an outlet through which the soil and gravel subjected to the thermal desorption treatment are discharged, wherein a single or a plurality of microwave oscillating parts are connected to one side of the treatment section, the contaminant desorbing part includes an outer tube that constitutes a cylindrical fixed container and an inner tube that is formed in a cylindrical shape having a smaller diameter than the outer tube and rotatably disposed inside the outer tube by a rotation shaft and into which the contaminated soil and gravel are introduced through the inlet, a driving motor to which the rotation shaft is extended and connected is provided outside of the outer tube, an outer circumferential surface of the inner tube is provided with a microwave absorbing and heat generating element for absorbing microwaves to generate heat, a cavity space for reflecting microwaves is provided between the outer tube and the inner tube, and the microwaves irradiated from the single or the plurality of microwave oscillating parts generate irregular reflection in the cavity space so that heat is generated in the microwave absorbing and heat generating element provided on the outer circumferential surface of the inner tube, thereby thermally desorbing contaminants from the contaminated soil and gravel inside the inner tube; and a retrieving part configured to retrieve soil and gravel from which the contaminants have been removed through the contaminant desorbing part, wherein the contaminant desorbing part comprises portions extended from opposite ends of the outer tube and a plurality of microwave attenuating members each of which has a hook shape bent twice in a center direction of the contaminant desorbing part along inner circumferential surfaces of the extended portions of the outer tube. 2. The oil-contaminated soil and gravel thermal desorption system using a microwave indirect irradiation method of claim 1 , further comprising: a pretreatment part configured to treat the contaminated soil to form fine particles; and at least one of a crusher configured to crush the contaminated soil fine-granulated in the pretreatment part and a sorter configured to sort the contaminated soil by particle size. 3. The oil-contaminated soil and gravel thermal desorption system using a microwave indirect irradiation method of claim 1 , wherein the conveying part further comprises a drying unit for drying the contaminated soil and gravel. 4. The oil-contaminated soil and gravel thermal desorption system using a microwave indirect irradiation method of claim 1 , wherein the contaminant desorbing part is connected to an emission post-treatment part for transporting and treating gas and dust discharged by desorption of the contaminants and then discharging the treated gas and dust. 5. The oil-contaminated soil and gravel thermal desorption system using a microwave indirect irradiation method of claim 4 , wherein a waste heat discharge pipe for discharging waste heat remaining in the emission post-treatment part is connected to the emission post-treatment part in one direction, and wherein the waste heat discharge pipe is configured to pass through the storage part. 6. An oil-contaminated soil and gravel thermal desorption method using a microwave indirect irradiation method comprising: (1) storing contaminated soil and gravel in a storage part and conveying the contaminated soil and gravel to a contaminant desorbing part; (2) desorbing contaminants from the contaminated soil and gravel by heat while conveying the contaminated soil and gravel in the contaminant desorbing part, wherein the contaminant desorbing part includes an inlet through which the contaminated soil and gravel are introduced, a treatment section in which the contaminated soil and gravel are subjected to thermal desorption treatment, and an outlet through which soil and gravel subjected to the thermal desorption treatment are discharged, a single or a plurality of microwave oscillating parts are connected to one side of the treatment section, the contaminant desorbing part includes an outer tube that constitutes a cylindrical fixed container and an inner tube that is formed in a cylindrical shape having a smaller diameter than the outer tube and rotatably disposed inside the outer tube by a rotation shaft and into which the contaminated soil and gravel are introduced through the inlet, a driving motor to which the rotation shaft is extended and connected is provided outside of the outer tube, an outer circumferential surface of the inner tube is provided with a microwave absorbing and heat generating element for absorbing microwaves to generate heat, a cavity space for reflecting microwaves is provided between the outer tube and the inner tube, and the microwaves irradiated from the single or the plurality of microwave oscillating parts generate irregular reflection in the cavity space so that heat is generated in the microwave absorbing and heat generating element provided on the outer circumferential surface of the inner tube, thereby thermally desorbing contaminants from the contaminated soil and gravel inside the inner tube; and (3) retrieving the soil and gravel from which the contaminants have been removed through the contaminant desorbing part, wherein the contaminant desorbing part includes portions extended from opposite ends of the outer tube and a plurality of microwave attenuating members each of which has a hook shape bent twice in a center direction of the contaminant desorbing part along inner circumferential surfaces of the extended portions of the outer tube, thereby preventing the microwaves emitted into the space between the outer tube and the inner tube from leaking to an outside. 7. The oil-contaminated soil and gravel thermal desorption method using a microwave indirect irradiation method of claim 6 , wherein the contaminant desorbing part is connected to an emission post-treatment part for transporting and treating gas and dust discharged by desorption of the contaminants and then discharging the treated gas and dust, wherein a waste heat discharge pipe for discharging waste heat remaining in the emission post-treatment part is connected to the emission post-treatment part in one direction, and wherein the waste heat discharge pipe is configured to pass through the storage part, so that the contaminated soil and gravel is preheated using the waste heat in the storage part.
thermally · CPC title
Separating or sorting of material, associated with crushing or disintegrating (B02C23/18 takes precedence {; beater mills combined with sifting devices B02C13/13, B02C13/14; for tumbling mills B02C17/1835}) · CPC title
Electromagnetic heating, e.g. induction heating or heating using microwave energy · CPC title
with separator arranged in discharge path of crushing or disintegrating zone · CPC title
Reclamation of contaminated soil · CPC title
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