IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0549902
(2000-04-14)
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발명자
/ 주소 |
- Vinegar, Harold J.
- Stegemeier, George L.
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출원인 / 주소 |
- Board of Regents, The University of Texas System
|
대리인 / 주소 |
Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
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인용정보 |
피인용 횟수 :
55 인용 특허 :
31 |
초록
▼
An in situ thermal desorption system may be used to remove contamination from soil. Off-gas removed from the soil may be transported from the soil to a treatment facility by high temperature hoses and plastic piping. The use of high temperature hose and plastic pipe may reduce the capital cost, inst
An in situ thermal desorption system may be used to remove contamination from soil. Off-gas removed from the soil may be transported from the soil to a treatment facility by high temperature hoses and plastic piping. The use of high temperature hose and plastic pipe may reduce the capital cost, installation cost, and operating cost as compared to conventional transport systems from thermal desorption soil remediation systems. The high temperature hose and plastic pipe are highly resistant to corrosion caused by the off-gas. The treatment facility may separate the off-gas into a liquid stream and a vapor stream. The liquid stream and the vapor stream may be processed to reduce contaminants within the liquid stream and vapor stream to acceptable levels.
대표청구항
▼
1. A thermal soil remediation system for removing contaminants from soil, comprising:a plurality of strip heaters in the soil;a plurality of vacuum wells comprising perforated casings;high temperature hoses configured to couple the perforated casings to a vacuum manifold that comprises plastic pipin
1. A thermal soil remediation system for removing contaminants from soil, comprising:a plurality of strip heaters in the soil;a plurality of vacuum wells comprising perforated casings;high temperature hoses configured to couple the perforated casings to a vacuum manifold that comprises plastic piping, wherein the high temperature hoses convey heated off-gas removed from the soil to the vacuum manifold; andwherein one of the strip heaters comprises a first heater section and a second heater section, and wherein a cross-sectional area of the first heater section is less than a cross-sectional area of the second heater section so that the first heater section generates more heat than the second heater section during use, and wherein at least the first heater section has a substantially rectangular cross section. 2. The system of claim 1, wherein a material of construction of the high temperature hoses and a material of construction of the vacuum manifold inhibits corrosion by decomposition products of contaminants that are generated by thermal decomposition from heat provided by the strip heaters. 3. The system of claim 1, wherein a material of construction of the high temperature hoses and a material of construction of the vacuum manifold inhibits corrosion by HCl (hydrogen chloride). 4. The system of claim 1, wherein a casing of a vacuum well is positioned between legs of a strip heater. 5. The system of claim 1, wherein the strip heater having the first heater section and the second heater section is formed in a U shape, and wherein the first heater section is located at the bottom of the U-shaped strip heater. 6. The system of claim 1, wherein at least one of the strip heaters is positioned in a trench formed in the soil. 7. The system of claim 1, wherein at least one of the hoses comprises reinforcement to inhibit collapse of the hose when vacuum is drawn on the soil through the hose. 8. The system of claim 1, wherein the vacuum manifold comprises chlorinated polyvinyl chloride piping. 9. The system of claim 1, wherein lengths of the hoses provide residence times in the hoses for hot off-gas flowing in the hoses, and wherein the residence times allow the vapor to cool at least to temperatures that will inhibit temperature of the vacuum manifold from exceeding an upper working temperature limit of the vacuum manifold. 10. The system of claim 1, further comprising a treatment facility coupled to the vacuum manifold, wherein the treatment facility is configured to reduce contamination in the off-gas to an acceptable level. 11. A thermal soil remediation system for removing contaminants from soil, comprising:a plurality of strip heaters in the soil;a plurality of vacuum wells comprising perforated casings;high temperature hoses configured to couple the perforated casings to a vacuum manifold that comprises plastic piping, wherein the high temperature hoses convey heated off-gas removed from the soil to the vacuum manifold; andwherein at least one of the strip heaters comprises a U-shaped strip, and wherein a cross-sectional shape of the at least one strip heater is rectangular. 12. The system of claim 11, further comprising one or more insulated centralizers, wherein the one or more insulated centralizers are positioned between the perforated casings and the strip heaters, and wherein the perforated casings are positioned between legs of the strip heaters. 13. The system of claim 11, wherein the perforated casings are configured such that the vacuum wells draw vapor into the perforated casings, and wherein the vapor is removed as off-gas from the soil. 14. The system of claim 11, further comprising an impermeable barrier, wherein the impermeable barrier is configured to limit an amount of air drawn into the soil. 15. The system of claim 14, further comprising a thermal barrier, wherein the thermal barrier is configured to inhibit thermal degradation of the impermeable barrier. 16. The system of claim 11, further comprising a th ermal barrier. 17. The system of claim 11, further comprising an external casing, wherein the external casing is configured to inhibit current leakage in soil. 18. The system of claim 11, further comprising:an external casing for a strip heater of the strip heaters; andfill material, wherein the fill material is positioned adjacent to the external casing and the strip heater. 19. The system of claim 18, wherein the fill material is configured to promote thermal degradation of the contaminants in the soil. 20. The system of claim 11, wherein a material of construction of the high temperature hoses and a material of construction of the vacuum manifold inhibits corrosion by decomposition products of contaminants that are generated by thermal decomposition from heat provided by the strip heaters. 21. The system of claim 11, wherein at least one strip heater is positioned in the soil by vibrating the strip heater into the soil. 22. The system of claim 11, wherein a strip heater of the strip heaters comprises a first heater section and a second heater section, and wherein a cross-sectional area of the first heater section is less than a cross-sectional area of the second heater section so that the first heater section generates more heat than the second heater section during use. 23. The system of claim 11, further comprising a treatment facility coupled to the vacuum manifold, wherein the treatment facility is configured to reduce contamination within the off-gas to an acceptable level. 24. A thermal soil remediation system for removing contaminants from soil, comprising:strip heaters, wherein at least a portion of each strip heater is positioned in the soil;vacuum wells comprising perforated casings;high temperature hoses configured to couple the perforated casings to a vacuum manifold that comprises plastic piping, wherein the high temperature hoses convey heated off-gas removed from the soil to the vacuum manifold, and wherein lengths of the hoses provide residence times for hot off-gas flowing in the hoses, and wherein the residence times allow the vapor to cool at least to temperatures that will inhibit temperature of the vacuum manifold from exceeding an upper working temperature limit of the vacuum manifold; andinsulated centralizers positioned between the perforated casings and the strip heaters, and wherein the perforated casings are positioned between legs of the strip heaters;wherein one or more of the strip heaters comprise a first heater section and a second heater section, and wherein a cross-sectional area of the first heater section is less than a cross-sectional area of the second heater section so that first heater section generates more heat than the second heater section during use. 25. The system of claim 24, wherein the vacuum wells are configured to draw vapor into the perforated casings, and wherein the vapor is removed as off-gas from the soil. 26. The system of claim 24, further comprising a thermocouple positioned in one of the perforated casings. 27. The system of claim 24, further comprising a barrier that is substantially impermeable to air and water, and wherein the barrier is positioned at or near a soil-air interface. 28. The system of claim 24, further comprising a thermal barrier positioned near or at a soil-air interface. 29. The system of claim 24, further comprising a first barrier substantially impermeable to air and water, a second barrier which is a thermal barrier, wherein the second barrier is configured to inhibit vapor from condensing on the first barrier, and wherein the first barrier and the second barrier are positioned near or at a soil-air interface. 30. The system of claim 24, further comprising a treatment facility coupled to the vacuum manifold, wherein the treatment facility is configured to reduce contamination in the off-gas to an acceptable level.
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