A distillation unit (10) employs a rotary heat exchanger (32) forming a multiplicity of evaporation chambers (56) into which a liquid to be purified is sprayed for evaporation. Spray arms (58) spray at a steady rate into all of the evaporation chambers (56) simultaneously but not at a rate that is a
A distillation unit (10) employs a rotary heat exchanger (32) forming a multiplicity of evaporation chambers (56) into which a liquid to be purified is sprayed for evaporation. Spray arms (58) spray at a steady rate into all of the evaporation chambers (56) simultaneously but not at a rate that is adequate to maintain the wetting required for efficient transfer of heat to the liquid. A scanning sprayer (140) supplements this steady spray with spray from nozzles (142and144) into only a few of the evaporation chambers at a time, visiting all of them cyclically. The overall rate of spray from the two sources thus combined to spray the chamber cyclically maintains proper wetting even though on average it is lower than the rate that would be required of a constant-rate spray into all of the evaporation chambers.
대표청구항▼
1. For distilling a liquid, an evaporator-and-condenser unit comprising: a heat exchanger that forms at least one condensation chamber and a plurality of evaporation chambers and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the plurality of evapo
1. For distilling a liquid, an evaporator-and-condenser unit comprising: a heat exchanger that forms at least one condensation chamber and a plurality of evaporation chambers and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the plurality of evaporation chambers; a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each of the evaporation chambers has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, wherein the times at which the rates of irrigation of some of the evaporation chambers reach their respective peak irrigation rates are different from those at which others of the plurality of evaporation chambers do; and a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the plurality of evaporation chambers, wherein the irrigation system further includes: A) a main sprayer system, which irrigates each said evaporation chamber for at least the majority of the time; and B) an auxiliary sprayer system, which irrigates each of the evaporation chambers for only a minority of the time, the rate at which each said evaporation chamber is irrigated while the auxiliary sprayer system is irrigating it being at least twice the average irrigation rate thereof. 2. An evaporator-and-condenser unit as defined in claim 1 wherein the auxiliary sprayer system includes a plurality of auxiliary-system nozzles from which the auxiliary sprayer system produces an auxiliary-system spray by which the auxiliary sprayer system irrigates the evaporation chambers. 3. An evaporator-and-condenser unit as defined in claim 1 wherein the main sprayer system includes a plurality of main-system nozzles from which the main sprayer system produces a main-system spray by which the main sprayer system irrigates the evaporation chambers. 4. An evaporator-and-condenser unit as defined in claim 1 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the evaporation chambers. 5. For distilling a liquid, an evaporator-and-condenser unit comprising: A) a heat exchanger that forms at least one condensation chamber and at least one evaporation chamber and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the at least one evaporation chamber; B) a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each said evaporation chamber has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, wherein the peak irritation rate for each said at least one evaporation chamber exceeds the steady-state rate required to keep the heat-transfer surfaces thereof wetted, and the average irrigation rate for each said at least one evaporation chamber is no more than half the steady-state rate required to keep the heat-transfer surfaces of that evaporation chamber wetted; and C) a vapor guide defining a vapor path alone which it directs to the at least one condensation chamber vapor thereby produced in the at least one evaporation chamber; and D) a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the at least one evaporation chamber. 6. For distilling a liquid, an evaporator-and-condenser unit comprising: a heat exchanger that forms at least one condensation chamber and a plurality of evaporation chambers and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the plurality of evaporation chambers: a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each said plurality of evaporation cha mbers has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, wherein the peak irrigation rate for each said plurality of evaporation chambers exceeds the steady-state rate required to keep the heat-transfer surfaces thereof wetted, and the average irrigation rate for each said plurality of evaporation chambers is no more than half the steady-state rate required to keep the heat-transfer surfaces of that evaporation chamber wetted, and wherein the times at which the rates of irrigation of some of the evaporation chambers reach their respective peak irrigation rates are different from those at which others of the evaporation chambers do; and a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the plurality of evaporation chambers; wherein the irrigation system further includes: A) a main sprayer system, which irrigates each said evaporation chamber for at least the majority of the time; and B) an auxiliary sprayer system, which irrigates each said at least one evaporation chamber for only a minority of the time, the rate at which each said evaporation chamber is irrigated while the auxiliary sprayer system is irrigating it being at least twice the average irrigation rate thereof. 7. For distilling a liquid, an evaporator-and-condenser unit comprising: A) a heat exchanger that forms at least one condensation chamber and at least one evaporation chamber and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the at least one evaporation chamber; B) a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each said evaporation chamber has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, wherein the peak irrigation rate for each said at least one evaporation chamber exceeds the steady-state rate required to keep the heat-transfer surfaces thereof wetted, and the average irrigation rate for each said at least one evaporation chamber is no more than half the steady-state rate required to keep the heat-transfer surfaces of that evaporation chamber wetted; and C) a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the at least one evaporation chamber, wherein the heat exchanger is a rotary heat exchanger in which the heat-transfer surfaces are mounted for rotation about a central cavity from which the irrigation system irrigates the at least one evaporation chamber. 8. An evaporator-and-condenser unit as defined in claim 7 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the at least one evaporation chamber. 9. An evaporator-and-condenser unit as defined in claim 7 wherein: A) the evaporation-and-condenser unit includes a plurality of the evaporation chambers; and B) the times at which the rates of irrigation of some of the evaporation chambers reach their respective peak irrigation rates are different from those at which others of the evaporation chambers do. 10. A method as defined in claim 9 wherein each evaporation chamber's irrigation rate reaches its peak irrigation rate periodically. 11. An evaporator-and-condenser unit as defined in claim 9 wherein the irrigation system includes: A) a main sprayer system, which irrigates each said evaporation chamber for at least the majority of the time; and B) an auxiliary sprayer system, which irrigates each said at least one evaporation chamber for only a minority of the time, the rate at which each said evaporation chamber is irrigated while the auxiliary sprayer system is irrigating it being at least twice the average irrigation rate thereof. 12. An evaporator-and-condenser unit as defined in claim 11 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the at least one evaporation chamber. 13. An evaporator-and-condenser unit as defined in claim 11 wherein: A) the evaporator-and-condenser unit includes a plurality of said evaporation chambers; B) the auxiliary sprayer system includes at least one auxiliary-system nozzle, associated with at least some of said evaporation chambers, from which the auxiliary sprayer system produces an auxiliary-system spray; and C) for each of the evaporation chambers with which the auxiliary-system nozzle is associated, the auxiliary-system nozzle executes reciprocation between positions in which the auxiliary system spray irrigates that evaporation chamber and positions in which the auxiliary-system spray does not irrigate that evaporation chamber. 14. An evaporator-and-condenser unit as defined in claim 13 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the at least one evaporation chamber. 15. For distilling a liquid, an evaporator-and-condenser unit comprising: A) a heat exchanger that forms at least one condensation chamber and at least one evaporation chamber and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the at least one evaporation chamber; B) means for irrigating each said evaporation chamber at an irrigation rate that has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof; and C) a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the at least one evaporation chamber. 16. For distilling a liquid, an evaporator-and-condenser unit comprising: A) a heat exchanger that forms at least one condensation chamber and a plurality of evaporation chambers and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the evaporation chambers; B) a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each said evaporation chamber has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, the times at which at least one of the evaporation chambers reaches its peak irrigation rate differing from the times at which at least one other of the evaporation chambers does, the irrigation system including: i) a main sprayer system, which irrigates each said evaporation chamber for at least the majority of the time; andii) an auxiliary sprayer system, which irrigates each said at least one evaporation chamber for only a minority of the time and includes at least one auxiliary-system nozzle, associated with at least some of said evaporation chambers for each of which that auxiliary-system nozzle executes reciprocation between positions in which the auxiliary-system spray irrigates that evaporation chamber and positions in which the auxiliary-system spray does not irrigate that evaporation chamber, the rate at which each said evaporation chamber is irrigated while the auxiliary sprayer system s irrigating it being at least twice the average irrigation rate thereof; and C) a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the plurality of evaporation chambers. 17. An evaporator-and-condenser unit as defined in claim 16 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the evaporation chambers. 18. For distilling a liquid, an evaporator-and-condenser unit comprising: A) a heat exchanger that forms at least one condensation chamber and a plurality of evaporation chambers and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the plurality of evaporation chambers; B) a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each of the evaporation chambers has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, the times at which at least one of the evaporation chambers reaches its peak irrigation rate differing from the times at which at least one other of the evaporation chambers does, the irrigation system including: i) a main sprayer system, which irrigates each of the evaporation chambers for at least the majority of the time; and ii) an auxiliary sprayer system that irrigates each of the evaporation chambers for only a minority of the time, the rate at which each of the evaporation chambers is irrigated while the auxiliary sprayer system is irrigating it being at least twice the average irrigation rate thereof; and C) a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the evaporation chambers. 19. An evaporator-and-condenser unit as defined in claim 18 wherein the heat exchanger is a rotary heat exchanger in which the heat-transfer surfaces are mounted for rotation about a central cavity from which the irrigation system irrigates the plurality of evaporation chambers. 20. An evaporator-and-condenser unit as defined in claim 19 wherein: A) the evaporation-and-condenser unit includes a plurality of the evaporation chambers; and B) the times at which the rates of irrigation of some of the evaporation chambers reach their respective peak irrigation rates are different from those at which others of the evaporation chambers do. 21. An evaporator-and-condenser unit as defined in claim 19 wherein each evaporation chamber's irrigation rate reaches its peak irrigation rate periodically. 22. An evaporator-and-condenser unit as defined in claim 19 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the evaporation chambers. 23. An evaporator-and-condenser unit as defined in claim 18 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the evaporation chambers. 24. An evaporator-and-condenser unit as defined in claim 18 wherein: A) the auxiliary sprayer system includes at least one auxiliary-system nozzle, associated with at least some of said evaporation chambers, from which the auxiliary sprayer system produces an auxiliary-system spray; and B) for each of the evaporation chambers with which the auxiliary-system nozzle is associated, the auxiliary-system nozzle executes reciprocation between positions in which the auxiliary-system spray irrigates that evaporation chamber and positions in which the auxiliary-system spray does not irrigate that evaporation chamber. 25. An evaporator-and-condenser unit as defined in claim 24 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the evaporation chambers. 26. For distilling a liquid, an evaporator-and-condenser unit comprising: A) a heat exchanger that forms at least one condensation chamber and a plurality of evaporation chambers and includes heat-transfer surfaces by which heat passes front the at least one condensation chamber to the evaporation chambers; B) a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each said evaporation chamber has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, the times at which at least one of the evaporation chambers reaches its peak irrigation rate differing from the times at which at least one other of the evaporation chambers does, the evaporation chambers' peak irrigation rates exceeding the steady-state rate required to keep the heat-transfer surfaces thereof wetted, but the evaporation chambers' average irrigation rates being no more than half that steady-state rate, the irrigation system including: i) a main sprayer system, which irrigates each of the evaporation chambers for at least the majority of the time; andii) an auxiliary sprayer system, which irrigates each of the evaporation chambers for only a minority of the time, the rate at which each of the evaporation chambers is irrigated while the auxiliary sprayer system is irrigating it being at least twice the average irrigation rate thereof; C) a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the at least one evaporation chamber; and D) a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the evaporation chambers. 27. For distilling a liquid, an evaporator-and-condenser unit comprising: A) a heat exchanger that forms at least one condensation chamber and a plurality of evaporation chambers and includes heat-transfer surfaces by which heat passes from the at least one condensation chamber to the evaporation chambers; B) a varying-rate evaporation-chamber irrigation system whose rate of irrigation of each said evaporation chamber has a respective average irrigation rate and so varies as repeatedly to reach a respective peak irrigation rate that is at least twice the average irrigation rate thereof, the times at which at least one of the evaporation chambers reaches its peak irrigation rate differing from the times at which at least one other of the evaporation chambers does, the evaporation chambers' peak irrigation rates exceeding the steady-state rate required to keep the heat-transfer surfaces thereof wetted, but the evaporation chambers' average irrigation rates being no more than half that steady-state rate, the irrigation system including: i) a main sprayer system, which irrigates each of the evaporation chambers for at least the majority of the time; andii) an auxiliary sprayer system, which irrigates each of the evaporation chambers for only a minority of the time and includes at least one auxiliary-system nozzle, associated with at least some of said evaporation chambers for each of which that auxiliary-system nozzle executes reciprocation between positions in which the auxiliary system spray irrigates that evaporation chamber and positions in which the auxiliary-system spray does not irrigate that evaporation chamber, the rate at which each of the evaporation chambers is irrigated while the auxiliary sprayer system is irrigating it being at least twice the average irrigation rate thereof; and C) a vapor guide defining a vapor path along which it directs to the at least one condensation chamber vapor thereby produced in the evaporation chambers. 28. An evaporator-and-condenser unit as defined in claim 27 further including a compressor so interposed in the vapor path as to make the vapor pressure in the at least one condensation chamber exceed that in the evaporation chambers.
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