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US 8,986,429 B2Granted
Off gas extraction and chemical recovery system and related methods
OwnerCarol D. Krumbholz, Grant Geckelerinventors
Life of this patent
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Abstract
An off gas extraction system provides superior results to other systems for cleaning polluted soil. Off gas is extracted, followed by compression and condensation. Compression and condensation produce an off gas further treated to produce pollutant-free exhaust. A regenerative adsorber cleans the influent gas/air by adsorbing residual chemical vapor and concentrates the removed chemical vapor and reprocesses them. Conventional scrubbers are used on the back end of the system to produce a final exhaust as prescribed by environmental regulation. Methods of accomplishing the same are likewise taught including combinations and additions consistent with schemes as they evolve.
Claims17
A device comprising, in combination:
- at least one off gas extraction source;
- at least one vacuum and compression module;
- and
- at least one vapor elimination module comprising:
- at least one condensation module to condense fluid from off gas, the at least one condensation module comprising an air-to-air heat exchanger and an air-to-refrigerant heat exchanger working in tandem wherein an exhaust gas from the air-to-refrigerant heat exchanger is used to cool an intake gas into the air-to-air heat exchanger and the intake gas into the air-to-air heat exchanger is used to warm the exhaust gas from the air-to-refrigerant heat exchanger;
- and
- at least one regenerative adsorbing module having a plurality of activated alumina adsorbers;
- wherein each adsorber adsorbs pollutants from a high pressure gas and desorbs the pollutants into a low pressure gas;
- wherein the low pressure gas holding the desorbed pollutants is returned into the at least one condensation module or the at least one vacuum and compression module.
6 more elements
A device comprising, in combination:
- at least one off gas extraction source;
- at least one vacuum and compression module comprising:
- a vacuum source;
- a compressor;
- and
- an aftercooler;
- and
- at least one vapor elimination module comprising:
- at least one condensation module to condense fluid from off gas, the condensation module comprising an air-to-air heat exchanger and an air-to-refrigerant heat exchanger working in tandem wherein an exhaust gas from the air-to-refrigerant heat exchanger is used to cool an intake gas into the air-to-air heat exchanger and the intake gas into the air-to-air heat exchanger is used to warm the exhaust gas from the air-to-refrigerant heat exchanger;
- and
- at least one regenerative adsorbing module having a plurality of activated alumina adsorbers;
- wherein each adsorber adsorbs pollutants from a high pressure gas and desorbs the pollutants into a low pressure gas;
- wherein the low pressure gas holding the desorbed pollutants is returned into the at least one condensation module or the at least one vacuum and compression module.
10 more elements
A method comprising:
- extracting an off-gas gas comprising contaminants;
- compressing the off-gas gas to form a high pressure concentrated off-gas;
- routing the high pressure concentrated off-gas to a condensation module comprising an air-to-air heat exchanger and an air-to-refrigerant heat exchanger working in tandem, wherein an exhaust gas from the air-to-refrigerant heat exchanger is used to cool an intake gas into the air-to-air heat exchanger and the intake gas into the air-to-air heat exchanger is used to warm the exhaust gas from the air-to-refrigerant heat exchanger, to form a condensate of the contaminants and a high pressure condensed off-gas, wherein condensate is routed to a contaminant recovery tank and the high pressure condensed off-gas is routed to a regenerative adsorbing module;
- adsorbing any residual contaminants from the high pressure condensed off-gas in the regenerative adsorbing module with a plurality of activated alumina adsorbers to produce a substantially contaminant-free exhaust gas;
- desorbing the adsorbers that contain contaminant with a portion of the contaminant-free exhaust gas at low pressure to form a concentrated contaminated gas that is routed to the condensation module;
- and
- scrubbing the substantially contaminant-free exhaust gas with activated carbon to produce a clean exhaust gas.
4 more elements
A device comprising, in combination:
- at least one off gas extraction source;
- and
- at least one vacuum and compression module;
- at least one vapor elimination module comprising:
- at least one condensation module to condense fluid from off gas, the at least one condensation module comprising an air-to-air heat exchanger and an air-to-refrigerant heat exchanger working in tandem wherein an exhaust gas from the air-to-refrigerant heat exchanger is used to cool an intake gas into the air-to-air heat exchanger and the intake gas into the air-to-air heat exchanger is used to warm the exhaust gas from the air-to-refrigerant heat exchanger;
- and
- at least one regenerative adsorbing module having a plurality of activated alumina adsorbers;
- wherein each adsorber adsorbs pollutants from a high pressure gas and desorbs the pollutants into a low pressure gas;
- wherein the low pressure gas holding the desorbed pollutants is returned into the at least one condensation module or the at least one vacuum and compression module;
- and
- wherein the low pressure gas holding the desorbed pollutants enriches the pollutant concentration of the off gas entering the vacuum and compression module.
8 more elements
A device comprising, in combination:
- at least one off gas extraction source;
- at least one vacuum and compression module;
- and
- at least one vapor elimination module comprising:
- at least one condensation module to condense fluid from off gas, the at least one condensation module comprising an air-to-air heat exchanger and an air-to-refrigerant heat exchanger working in tandem wherein an exhaust gas from the air-to-refrigerant heat exchanger is used to cool an intake gas into the air-to-air heat exchanger and the intake gas into the air-to-air heat exchanger is used to warm the exhaust gas from the air-to-refrigerant heat exchanger;
- and
- at least one regenerative adsorbing module having a plurality of activated alumina adsorbers;
- wherein each adsorber adsorbs pollutants from a high pressure gas and desorbs the pollutants into a low pressure gas;
- wherein the low pressure gas holding the desorbed pollutants is returned into the at least one condensation module or the at least one vacuum and compression module;
- and
- wherein the low pressure gas holding the desorbed pollutants enriches the pollutant concentration of the off gas entering the vacuum and compression module.
8 more elements
A device comprising, in combination:
- at least one off gas extraction source;
- at least one vacuum and compression module;
- and
- at least one vapor elimination module comprising:
- at least one condensation module to condense fluid from off gas, the at least one condensation module comprising an air-to-air heat exchanger and an air-to-refrigerant heat exchanger working in tandem wherein an exhaust gas from the air-to-refrigerant heat exchanger is used to cool an intake gas into the air-to-air heat exchanger and the intake gas into the air-to-air heat exchanger is used to warm the exhaust gas from the air-to-refrigerant heat exchanger;
- and
- at least one regenerative adsorbing module having a plurality of activated alumina adsorbers;
- wherein each adsorber adsorbs pollutants from a high pressure gas and desorbs the pollutants into a low pressure gas;
- wherein the low pressure gas holding the desorbed pollutants is returned into the at least one condensation module or the at least one vacuum and compression module;
- and
- wherein the gas holding desorbed pollutants is returned into a point before the condensation module.
8 more elements
A device comprising, in combination:
- at least one off gas extraction source;
- at least one vacuum and compression module;
- and
- at least one vapor elimination module comprising:
- at least one condensation module to condense fluid from off gas, the at least one condensation module comprising an air-to-air heat exchanger and an air-to-refrigerant heat exchanger working in tandem wherein an exhaust gas from the air-to-refrigerant heat exchanger is used to cool an intake gas into the air-to-air heat exchanger and the intake gas into the air-to-air heat exchanger is used to warm the exhaust gas from the air-to-refrigerant heat exchanger;
- and
- at least one regenerative adsorbing module having a plurality of activated alumina adsorbers;
- wherein each adsorber adsorbs pollutants from a high pressure gas and desorbs the pollutants into a low pressure gas;
- wherein the low pressure gas holding the desorbed pollutants is returned into the at least one condensation module or the at least one vacuum and compression module;
- and
- wherein the gas holding desorbed pollutants is returned into a point before the condensation module.
8 more elements
Dependencies are inferred from the claim text.