Patent US3839160A successfully refreshed from Google Patents.
US3839160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple effect evaporator
Assignee: Hitachi Ltd
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Filing: 1973-06-18
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Granted: 1974-10-01
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Expires: 1993-06-18
Abstract
Abstract A multiple effect evaporator for making fresh water from sea water, comprising a multistage flash evaporator serving the purpose of sea water preheating, in which said multistage flash evaporator is combined with a multistage fresh water flash evaporator so that pure water can also be made, and the evaporation-condensation area is distributed according to the amount of vapour generated at each evaporation stage to enhance the thermal efficiency and further the evaporator effects and multistage flash evaporator are arranged in a single casing to eliminate a certain piping and thereby to simplify the construction of the evaporator.
Inventors
- 👤 K Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:04
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/06; B01D3/065; C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/06; Y; Y10; Y10S; Y10S159/00; Y10S159/08; Y10S159/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
345 words
A multiple effect - multistage flash evaporator having several evaporator effects arranged serially for treating a feed liquor by passing it sequentially therethrough, wherein hot vapor generated in one of said evaporator multieffects is used for heating the feed liquor passing in the next multieffect evaporator, whereby the feed liquor is partially evaporated and increased in concentricity, while said hot vapor is condensed; said evaporator also comprising a multistage liquor flash evaporator having several evaporation stages for flash evaporating the feed liquor therein, several condensation stages for indirectly condensing the vapor generated in said respective liquor flash evaporation stages to fresh water by heat exchange with said feed liquor therein, said liquor flash evaporation stages and condensation stages being arranged serially in counterflow respectively, said liquor flash stages corresponding with said multieffect evaporator stages with respect to falling temperature and pressure gradient and liquor flow from first to last stage, means for heating the feed liquor emerging from said condensation stages and lines For thence leading the heated liquor to both said multieffect and liquor flash evaporator stages; a multistage fresh water flash evaporator having several fresh water flash evaporation stages, several condensation stages for indirectly condensing the vapor generated in said respective fresh water evaporation stages to pure water by indirect heat exchange with said feed liquor therein, said fresh water flash evaporation stages and condensation stages respectively being arranged serially and in counterflow so that the fresh water flash stages are in a falling temperature and pressure gradient, liquor flow and condensate flow correspondence from the first to the last stage with those of the multieffect evaporator, and means for withdrawing the pure water from said condensation stages independently of the fresh water passing in said condensation stages; lines for leading the concentrated residual feed liquor into the corresponding evaporation stages of the multistage flash evaporator to be partially evaporated therein and supplying the residual feed liquor to the next evaporator effect; and lines for leading the fresh water thus formed into the flash evaporation stages of the multistage fresh water flash evaporator.
Claim 2
Dependent Claim
345 words
A multiple effect - multistage flash evaporator having several evaporator effects arranged serially for treating a feed liquor by passing it sequentially therethrough, wherein hot vapor generated in one of said evaporator multieffects is used for heating the feed liquor passing in the next multieffect evaporator, whereby the feed liquor is partially evaporated and increased in concentricity, while said hot vapor is condensed; said evaporator also comprising a multistage liquor flash evaporator having several evaporation stages for flash evaporating the feed liquor therein, several condensation stages for indirectly condensing the vapor generated in said respective liquor flash evaporation stages to fresh water by heat exchange with said feed liquor therein, said liquor flash evaporation stages and condensation stages being arranged serially in counterflow respectively, said liquor flash stages corresponding with said multieffect evaporator stages with respect to falling temperature and pressure gradient and liquor flow from first to last stage, means for heating the feed liquor emerging from said condensation stages and lines For thence leading the heated liquor to both said multieffect and liquor flash evaporator stages; a multistage fresh water flash evaporator having several fresh water flash evaporation stages, several condensation stages for indirectly condensing the vapor generated in said respective fresh water evaporation stages to pure water by indirect heat exchange with said feed liquor therein, said fresh water flash evaporation stages and condensation stages respectively being arranged serially and in counterflow so that the fresh water flash stages are in a falling temperature and pressure gradient, liquor flow and condensate flow correspondence from the first to the last stage with those of the multieffect evaporator, and means for withdrawing the pure water from said condensation stages independently of the fresh water passing in said condensation stages; lines for leading the concentrated residual feed liquor into the corresponding evaporation stages of the multistage flash evaporator to be partially evaporated therein and supplying the residual feed liquor to the next evaporator effect; and lines for leading the fresh water thus formed into the flash evaporation stages of the multistage fresh water flash evaporator.
Claim 3
Dependent Claim
110 words
A multiple effect - multistage flash evaporator according to claim 1, in which the flow rate of the feed liquor passing in the indirect condensation stages of said multistage liquor flash evaporator and said multistage fresh water flash evaporator varies with said stages so that in the multistage liquor flash evaporator the volumetric flow rate becomes progressively higher from the low temperature low pressure stage toward the high temperature high pressure stage, while in the indirect condensation stages of said multistage fresh water flash evaporator the volumetric flow rate of the feed liquor becomes progressively lower from the low pressure low temperature stage toward the high pressure high temperature stage.
Claim 4
Dependent Claim
217 words
A multiple effect - multistage flash evaporator comprising a casing; a multieffect evaporator part provided in said casing and having several evaporator effects arranged axially and contiguously of said casing and each including heating means of the vertical tube type, liquor chambers provided in adjoining relation to said evaporator effect heating means, vapor-liquor separating chambers arranged in adjoining relation to said evaporator effect heating means on the opposite side of said liquor chambers, and passages for leading the vapor separated in said vapor-liquor separating chambers into the heating means of the next stage evaporator effect; a multi-stage flash evaporation part provided in said casing and having a heater for the first flash stage and also having several feed heating chambers arranged axially and contiguously of said casing with feed liquor preheating conduits arranged therein, corresponding feed liquor flashing chambers and passages for leading the vapor generated in each said flashing chamber into its corresponding heating chamber for condensation therein, a partition plate provided in said casing extending axially thereof and separating said evaporator effect part and said multistage flash evaporation part from each other; passages for leading the preheated feed liquor from said flash chambers into their corresponding first-mentioned liquor chambers; and passages for leading the brine from said vapor-liquor separating chambers into their corresponding flashing chambers.
Claim 5
Dependent Claim
217 words
A multiple effect - multistage flash evaporator comprising a casing; a multieffect evaporator part provided in said casing and having several evaporator effects arranged axially and contiguously of said casing and each including heating means of the vertical tube type, liquor chambers provided in adjoining relation to said evaporator effect heating means, vapor-liquor separating chambers arranged in adjoining relation to said evaporator effect heating means on the opposite side of said liquor chambers, and passages for leading the vapor separated in said vapor-liquor separating chambers into the heating means of the next stage evaporator effect; a multi-stage flash evaporation part provided in said casing and having a heater for the first flash stage and also having several feed heating chambers arranged axially and contiguously of said casing with feed liquor preheating conduits arranged therein, corresponding feed liquor flashing chambers and passages for leading the vapor generated in each said flashing chamber into its corresponding heating chamber for condensation therein, a partition plate provided in said casing extending axially thereof and separating said evaporator effect part and said multistage flash evaporation part from each other; passages for leading the preheated feed liquor from said flash chambers into their corresponding first-mentioned liquor chambers; and passages for leading the brine from said vapor-liquor separating chambers into their corresponding flashing chambers.
Claim 6
Dependent Claim
75 words
A multiple effect - multistage flash evaporator according to claim 3, in which the interior of each of said heating chambers is divided by a partition plate into a first sub-chamber in which the vapor generated by the flash evaporation of the feed liquor is to be condensed and a second sub-chamber in which the condensate formed in said first sub-chamber is to be again flash-evaporated and the vapor thus generated is to be condensed.
Claim 7
Dependent Claim
144 words
A multiple effect - multistage flash evaporator according to claim 3, in which the interior oF each of said heating chambers is divided by a partition plate into a first sub-chamber in which the vapor generated by the flash evaporation of the feed liquor is to be condensed and a second sub-chamber in which the condensate formed in said first sub-chamber is to be again flash-evaporated and the vapor thus generated is to be condensed, and the position of said partition plate is changed in the respective heating chambers such that the volume of the first sub-chamber is larger than that of the second sub-chamber in the heating chambers closer to the feed liquor supply high pressure end and the volume of the first sub-chamber is smaller than that of the second sub-chamber in the heating chambers closer to the low pressure discharge end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |