Patent CH217613A successfully refreshed from Google Patents.
Patent US3939251A successfully refreshed from Google Patents.
US3939251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regeneration method for gas treating apparatus
Assignee: Hitachi Ltd
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Filing: 1972-08-07
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Granted: 1976-02-17
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Expires: 1992-08-07
Abstract
Abstract A method of desulphurization of a flue gas comprising passing a flue gas to a plurality of adsorption beds each having an activated carbon layer packed therein thereby separating a sulphur oxide contained in the flue gas by adsorption of the sulphur oxide in the activated carbon; continuing the adsorption until the concentration of sulphur oxide acid in the activated carbon reaches a predetermined value; providing a liquid for regenerating the activated carbon with at least one of the adsorption beds in order to wash down the activated carbon layer, wherein the introduction of the liquid into the adsorption bed to be regenerated is carried out while keeping all the passageways for introducing the flue gas into the adsorption beds open, thereby reducing a flow amount of flue gas in the adsorption bed to be regenerated so as to suppress adsorption of the sulphur oxide therein and to regenerate the adsorption bed. The supply of the regenerating liquid to each of the adsorption beds is repeatedly carried out in accordance with a predetermined time schedule.
Inventors
- 👤 Sabro Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; C01B17/69; C01B17/74; C01B17/76; C01B17/775; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/30; B01D2257/302; B01D2259/00; B01D2259/40; B01D2259/403; B01D53/047
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
227 words
A method of desulphurizing an exhaust gas containing sulphur oxide comprising: 1. introducing an exhaust gas containing sulphur oxide into a plurality of adsorption beds via open passageways, each bed being arranged in parallel with respect to the flow of exhaust gas and being packed with activated carbon thereby separating said sulphur oxide from said exhaust gas; 2. supplying a regenerating liquid from the top of the activated carbon layer to at least one of the adsorption beds when the a concentration of sulphur oxide adsorbed in said activated carbon has reached a predetermined value in order to regenerate said activated carbon; 3. drying said activated carbon wetted by said regenerating liquid with said exhaust gas whereby the activity of said activated carbon is increased to adsorb said sulphur oxide; said introducing of said flue gas, supplying of said regenerating liquid and drying of said activated carbon being carried out and repeated in accordance with a predetermined time schedule, the passageways for introducing said flue gas into each of said adsorption beds being kept open during said time schedule, and 4. regulating the flow rate of said flue gas in an adsorption bed to be regenerated solely with an increase in the flow rate of said regenerating liquid supplied to said adsorption bed, whereby said activated carbon in said adsorption bed to be regenerated is washed down.
Claim 2
Independent Claim
227 words
A method of desulphurizing an exhaust gas containing sulphur oxide comprising: 1. introducing an exhaust gas containing sulphur oxide into a plurality of adsorption beds via open passageways, each bed being arranged in parallel with respect to the flow of exhaust gas and being packed with activated carbon thereby separating said sulphur oxide from said exhaust gas; 2. supplying a regenerating liquid from the top of the activated carbon layer to at least one of the adsorption beds when the a concentration of sulphur oxide adsorbed in said activated carbon has reached a predetermined value in order to regenerate said activated carbon; 3. drying said activated carbon wetted by said regenerating liquid with said exhaust gas whereby the activity of said activated carbon is increased to adsorb said sulphur oxide; said introducing of said flue gas, supplying of said regenerating liquid and drying of said activated carbon being carried out and repeated in accordance with a predetermined time schedule, the passageways for introducing said flue gas into each of said adsorption beds being kept open during said time schedule, and 4. regulating the flow rate of said flue gas in an adsorption bed to be regenerated solely with an increase in the flow rate of said regenerating liquid supplied to said adsorption bed, whereby said activated carbon in said adsorption bed to be regenerated is washed down.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein the exhaust gas is a hot flue gas.
Claim 4
Independent Claim
244 words
A method of desulphurizing a flue gas comprising the following steps which are each repeated in accordance with a predetermined time schedule: a. continuously introducing a pressurized flue gas containing a sulphur oxide into each of a plurality of adsorption beds, each bed being arranged in parallel with respect to a flow of said flue gas and being packed with a layer of activated carbon, the pressure of said flue gas always being exerted on the activated carbon layer; b. supplying a predetermined flow of a regenerating liquid on the top surface of said activated carbon layer in an adsorption bed to be regenerated in such a manner that substantially the whole area of said top surface of said activated carbon layer is sufficiently wetted by said regenerating liquid, whereby sulphuric acid formed from the sulphur oxide and water and adsorbed in said activated carbon is washed down to regenerate said activated carbon; and c. stopping the supply of said regenerating liquid after a predetermined period of time, whereby the flowing of said flue gas through said adsorption bed is allowed and drying of said activated carbon starts, the step of supplying of said regenerating liquid being carried out in such a manner that each of said supplying steps with respect to each of said adsorption beds does not superpose within said time schedule, the flow of gas through each of said adsorption beds being solely controlled by the supplying of regenerating liquid thereto.
Claim 5
Independent Claim
244 words
A method of desulphurizing a flue gas comprising the following steps which are each repeated in accordance with a predetermined time schedule: a. continuously introducing a pressurized flue gas containing a sulphur oxide into each of a plurality of adsorption beds, each bed being arranged in parallel with respect to a flow of said flue gas and being packed with a layer of activated carbon, the pressure of said flue gas always being exerted on the activated carbon layer; b. supplying a predetermined flow of a regenerating liquid on the top surface of said activated carbon layer in an adsorption bed to be regenerated in such a manner that substantially the whole area of said top surface of said activated carbon layer is sufficiently wetted by said regenerating liquid, whereby sulphuric acid formed from the sulphur oxide and water and adsorbed in said activated carbon is washed down to regenerate said activated carbon; and c. stopping the supply of said regenerating liquid after a predetermined period of time, whereby the flowing of said flue gas through said adsorption bed is allowed and drying of said activated carbon starts, the step of supplying of said regenerating liquid being carried out in such a manner that each of said supplying steps with respect to each of said adsorption beds does not superpose within said time schedule, the flow of gas through each of said adsorption beds being solely controlled by the supplying of regenerating liquid thereto.
Claim 6
Dependent Claim
22 words
The method of claim 3, wherein the flue gas introduced into said adsorption beds has a temperature of at least about 55°C.
Claim 7
Independent Claim
249 words
A method of desulphurizing a flue gas comprising: a. introducing a flue gas containing a sulphur oxide and oxygen at a temperature of from about 55° to about 150°C through a passageway communicated with a flue source into a desulphuring apparatus wherein a plurality of adsorption beds, each being provided with an activated carbon layer, are arranged in parallel with respect to said passageway and a duct communicated with a chimney for exhausting the flue gas treated in said apparatus, each of said adsorption beds being in constant communication with said passageway and said duct; b. starting to supply a regenerating liquid at a predetermined flow rate to one of said adsorption beds after the quantity of sulphur oxide adsorbed in said activated carbon layer in said adsorption bed has reached a predetermined value; c. continuing to supply said regenerating liquid until the sulphuric acid formed from the adsorbed sulphur oxide is washed down sufficiently to regenerate said activated carbon layer; d. stopping the supply of said regenerating liquid into said one bed after said adsorption bed has been regenerated, whereby the flowing of said flue gas through said one adsorption bed automatically begins again so that the wetted activated carbon layer is dried and recovered to adsorb said sulphur oxide; and e. effecting the above steps of starting, continuing and stopping of said regenerating liquid into another adsorption bed so that the flow of flue gas through each bed is solely controlled by supply of regenerating liquid thereto.
Claim 8
Independent Claim
249 words
A method of desulphurizing a flue gas comprising: a. introducing a flue gas containing a sulphur oxide and oxygen at a temperature of from about 55° to about 150°C through a passageway communicated with a flue source into a desulphuring apparatus wherein a plurality of adsorption beds, each being provided with an activated carbon layer, are arranged in parallel with respect to said passageway and a duct communicated with a chimney for exhausting the flue gas treated in said apparatus, each of said adsorption beds being in constant communication with said passageway and said duct; b. starting to supply a regenerating liquid at a predetermined flow rate to one of said adsorption beds after the quantity of sulphur oxide adsorbed in said activated carbon layer in said adsorption bed has reached a predetermined value; c. continuing to supply said regenerating liquid until the sulphuric acid formed from the adsorbed sulphur oxide is washed down sufficiently to regenerate said activated carbon layer; d. stopping the supply of said regenerating liquid into said one bed after said adsorption bed has been regenerated, whereby the flowing of said flue gas through said one adsorption bed automatically begins again so that the wetted activated carbon layer is dried and recovered to adsorb said sulphur oxide; and e. effecting the above steps of starting, continuing and stopping of said regenerating liquid into another adsorption bed so that the flow of flue gas through each bed is solely controlled by supply of regenerating liquid thereto.
Claim 9
Dependent Claim
38 words
The method of desulphurizing a flue gas of claim 5 wherein the velocity of said regenerating liquid fed to said adsorption bed is kept at at least 0.2 × 10 - 2 m/s during regeneration of said bed.
Claim 10
Independent Claim
219 words
A method for desulphurizing a hot flue gas containing sulphur oxide which comprises introducing the hot flue gas upwardly through a plurality of adsorption beds being arranged in parallel and containing activated carbon to remove the sulphur oxide; supplying a regenerating liquid selected from the group consisting of water and dilute sulfuric acid to the top of one of the adsorption beds when the concentration of adsorbed sulphur oxide has reached a predetermined level to remove the adsorbed sulphur oxide as the liquid passes downwardly through the bed; drying the wet activated carbon by passing the hot flue gas upwardly through the regenerated adsorption bed; controlling the rate of supply of said regenerating liquid to resist the passage of the flue gas upwardly through the bed during the regeneration step; when said bed is subsequently changed over from regeneration step to said drying step, stopping the supply of said regenerating liquid to remove the resistance of said liquid against the passage of said flue gas; and changing from the drying step to the adsorption step immediately after drying of the activated carbon is completed, the passage of the flue gas, concurrently supplied to each of said beds, through the one adsorption bed undergoing regeneration thereby being solely controlled by the supply of the regenerating liquid to said one bed.
Claim 11
Independent Claim
219 words
A method for desulphurizing a hot flue gas containing sulphur oxide which comprises introducing the hot flue gas upwardly through a plurality of adsorption beds being arranged in parallel and containing activated carbon to remove the sulphur oxide; supplying a regenerating liquid selected from the group consisting of water and dilute sulfuric acid to the top of one of the adsorption beds when the concentration of adsorbed sulphur oxide has reached a predetermined level to remove the adsorbed sulphur oxide as the liquid passes downwardly through the bed; drying the wet activated carbon by passing the hot flue gas upwardly through the regenerated adsorption bed; controlling the rate of supply of said regenerating liquid to resist the passage of the flue gas upwardly through the bed during the regeneration step; when said bed is subsequently changed over from regeneration step to said drying step, stopping the supply of said regenerating liquid to remove the resistance of said liquid against the passage of said flue gas; and changing from the drying step to the adsorption step immediately after drying of the activated carbon is completed, the passage of the flue gas, concurrently supplied to each of said beds, through the one adsorption bed undergoing regeneration thereby being solely controlled by the supply of the regenerating liquid to said one bed.
Claim 12
Dependent Claim
145 words
A process for desulphurizing flue gas comprising passing pressurized flue gas into a passageway in constant communication with at least three adsorbent beds arranged in parallel with respect to the flow of the gas, said adsorbent beds each packed with an adsorbent for the sulphur oxides located above the point in said adsorbent beds where said passageway is in communication with said adsorbent beds, each adsorbent bed above said adsorbent being in constant communication with a common outlet passage for removing desulphurized flue gas from said adsorbent beds, and supplying a liquid capable of regenerating said adsorbent to one of said adsorbent beds above the adsorbent therein so that said liquid regenerates said adsorbent and automatically reduces the flow of flue gas through said one adsorbent bed, whereby flow of flue gas through each adsorbent bed is solely controlled by the supply of liquid thereto.
Claim 13
Dependent Claim
145 words
A process for desulphurizing flue gas comprising passing pressurized flue gas into a passageway in constant communication with at least three adsorbent beds arranged in parallel with respect to the flow of the gas, said adsorbent beds each packed with an adsorbent for the sulphur oxides located above the point in said adsorbent beds where said passageway is in communication with said adsorbent beds, each adsorbent bed above said adsorbent being in constant communication with a common outlet passage for removing desulphurized flue gas from said adsorbent beds, and supplying a liquid capable of regenerating said adsorbent to one of said adsorbent beds above the adsorbent therein so that said liquid regenerates said adsorbent and automatically reduces the flow of flue gas through said one adsorbent bed, whereby flow of flue gas through each adsorbent bed is solely controlled by the supply of liquid thereto.
Claim 14
Dependent Claim
97 words
A process according to claim 8 further comprising continuing the supply of liquid to said one adsorbent bed until said one adsorbent bed is substantially regenerated, stopping the supply of liquid to said one adsorbent bed and supplying a second of said adsorbent beds with said liquid above the adsorbent in said adsorbent beds whereby the flow of flue gas in said second adsorbent bed is automatically reduced by the liquid in said second bed and the flow of gas through said one adsorbent bed is automatically resumed as the liquid in said one adsorbent bed evaporates.
Claim 15
Dependent Claim
85 words
The process according to claim 9, wherein each of said adsorbent beds is periodically regenerated by supplying said liquid to said adsorbent bed above the adsorbent bed and wherein the flow of flue gas through the adsorbent bed being regenerated is automatically reduced by the liquid in said adsorbent bed and automatically resumes after the supply of liquid to the bed is stopped and the liquid in the bed is evaporated, only one of said adsorbent beds being supplied with liquid at any one time.
Claim 16
Dependent Claim
17 words
The process according to claim 10, wherein the flue gas is passed through three different adsorbent beds.
Claim 17
Dependent Claim
32 words
The process according to claim 9, comprising recovering the regenerating liquid passing out of the adsorbent bed being regenerated and utilizing the recovered regenerating liquid to supply the adsorbent bed being regenerated.
Claim 18
Dependent Claim
26 words
The process according to claim 9, wherein said adsorbent is activated carbon and said regenerating liquid is water or a dilute aqueous solution of sulphuric acid.
Claim 19
Dependent Claim
32 words
The process according to claim 9, wherein said flue gas is passed into five different adsorbent beds, only one of said adsorbent beds being supplied with regenerating liquid at any one time.
Claim 20
Dependent Claim
25 words
The process according to claim 9, wherein the temperature of the flue gas fed to the adsorption beds is maintained between about 55° and 150°C.
Claim 21
Dependent Claim
32 words
The process according to claim 8, comprising recovering the regenerating liquid passing out of the adsorbent bed being regenerated and utilizing the recovered regenerating liquid to supply the adsorbent bed being regenerated.
Claim 22
Dependent Claim
26 words
The process according to claim 9, wherein said adsorbent is activated carbon and said regenerating liquid is water or a dilute aqueous solution of sulphuric acid.
Claim 23
Dependent Claim
32 words
The process according to claim 8, wherein said flue gas is passed into five different adsorbent beds, only one of said adsorbent beds being supplied with regenerating liquid at any one time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |