Solar cogeneration seawater desalination systemTechnical field
The utility model relates to a kind of sea water by distillation desalination system, particularly relates to a kind of by solar energy heating and the system combined with sea water desaltination that generates electricity.
Background technology
Namely sea water desaltination utilizes sea water desalinization to produce fresh water, is the increment technique of increasing income realizing water resources utilization, can increases fresh water total amount, and not by space-time and weather effect, can ensure the stable water supply demand such as coastal Drinking Water for Residents and Industrial Boiler moisturizing.Coastal region is mainly saltings, and underground water is bittern entirely, and current urbanite water consumption mainly relies on nonlocal remote water supply.Along with the fast development of coastal region, Freshwater resources will be increasingly deficient, and promoting sea water desaltination is an effective solution route.At present, method for desalting seawater has two large classes, instant heating method (flash method, low-temperature multiple-effect distillation, compression distillation method etc.) and embrane method (reverse osmosis and electric method of analysis).Wherein, low-temperature multiple-effect distillation is got up by a series of evaporator series and is divided into some effect groups, with the input of a certain amount of heat source stream by seawater evaporation repeatedly and condensation, thus obtain the desalination technology of the distilled water being multiple times than heat source stream amount, there is energy-conservation, low, the desalination water quality advantages of higher of sea water preprocessing requirement.At present, low temperature multiple-effect distillation sea water desalting technology heat source stream used is generally commodity steam, expensive, causes sea water desaltination cost higher.
Utility model content
The technical problems to be solved in the utility model is to provide the solar cogeneration seawater desalination system that a kind of structure is simple, cost is low, easy and simple to handle.
The utility model solar cogeneration seawater desalination system, comprise solar energy heat collector and sea water desalinating plant, wherein said solar energy heat collector is trough type solar heat-collector, described sea water desalinating plant is low-temperature multi-effect seawater desalination device, the high-temperature medium exit end of described trough type solar heat-collector is connected with the heat exchange coil in vapour generator respectively with cryogenic media inlet end, the vapour outlet end of described vapour generator is connected with the steam-in of low-temperature multi-effect seawater desalination device, described low-temperature multi-effect seawater desalination device is connected to sea-water pump and fresh water tanks.
The utility model solar cogeneration seawater desalination system, wherein said low-temperature multi-effect seawater desalination device comprises a first evaporator, at least one middle single-effect evaporator and a last evaporator, the vapour outlet end of described vapour generator is connected with the heat exchange coil in first evaporator, the heat exchange coil the other end is connected with condensate tank by the first preheater, described condensate tank is connected with the water supplement port of vapour generator by service pump, described first evaporator, middle single-effect evaporator and last evaporator are connected successively, the mode of connecting is that the concentrated brine discharge mouth of prime vaporizer is connected with the shower of rear class vaporizer, the secondary steam discharge outlet of prime vaporizer is connected with the heat exchange coil of rear class vaporizer, described middle single-effect evaporator is connected with fresh water tanks by the second preheater with the heat exchange coil of last evaporator, the secondary steam discharge outlet of described last evaporator is connected with fresh water tanks by the 3rd preheater, the water outlet of described sea-water pump is successively by the 3rd preheater, second preheater is connected with the shower in first evaporator with the first preheater.
The utility model solar cogeneration seawater desalination system, is provided with oily trunk for expansion and oil circulating pump between the high-temperature medium exit end of wherein said trough type solar heat-collector and cryogenic media inlet end.
The utility model solar cogeneration seawater desalination system, wherein said system also comprises solar energy photovoltaic generator, and described solar energy photovoltaic generator is connected with service pump with oil circulating pump by invertor.
The utility model solar cogeneration seawater desalination system difference from prior art is that trough type solar heat-collector combines with low-temperature multi-effect seawater desalination device by the utility model solar cogeneration seawater desalination system, utilize trough type solar heat-collector and vapour generator to coordinate and produce high-temperature steam, then low-temperature multi-effect seawater desalination device is driven to carry out sea water desaltination work with high-temperature steam, source due to steam is sun power, substantially extra energy consumption is not produced, clean environment firendly, operation cost is low.
Below in conjunction with accompanying drawing, solar cogeneration seawater desalination system of the present utility model is described further.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model solar cogeneration seawater desalination system.
Embodiment
As shown in Figure 1, the utility model solar cogeneration seawater desalination system comprises solar energy heat collector and sea water desalinating plant, and solar energy heat collector is trough type solar heat-collector 1, and sea water desalinating plant is low-temperature multi-effect seawater desalination device 2.The high-temperature medium exit end of trough type solar heat-collector 1 is connected with the heat exchange coil in vapour generator 3 respectively with cryogenic media inlet end.Oily trunk for expansion 11 and oil circulating pump 12 is provided with between the high-temperature medium exit end of trough type solar heat-collector 1 and cryogenic media inlet end.
Low-temperature multi-effect seawater desalination device 2 comprises single-effect evaporator 22 and a last evaporator 23 in the middle of a first evaporator 21, the vapour outlet end of vapour generator 3 is connected with the heat exchange coil in first evaporator 21, the heat exchange coil the other end is connected with condensate tank 31 by the first preheater 24, and condensate tank 31 is connected by the water supplement port of service pump 32 with vapour generator 3.First evaporator 21, middle single-effect evaporator 22 and last evaporator 23 are connected successively, the mode of connecting is that the concentrated brine discharge mouth of prime vaporizer is connected with the shower of rear class vaporizer, the secondary steam discharge outlet of prime vaporizer is connected with the heat exchange coil of rear class vaporizer, middle single-effect evaporator 22 is connected with fresh water tanks 5 by the second preheater 25 with the heat exchange coil of last evaporator 23, the secondary steam discharge outlet of last evaporator 23 is connected with fresh water tanks 5 by the 3rd preheater 26, the water outlet of sea-water pump 4 is successively by the 3rd preheater 26, second preheater 25 is connected with the shower in first evaporator 21 with the first preheater 24.System also comprises solar energy photovoltaic generator 6, and solar energy photovoltaic generator 6 is connected with service pump 32 with oil circulating pump 12 by invertor 61.
Its working process: trough type solar heat-collector 1 collects heat by heat pipe, heat by medium transport in vapour generator 3, water endothermic conversion in vapour generator 3 becomes steam, steam enters in the heat exchange coil of first evaporator 21, through with seawater to make heat exchange after enter condensate tank 31, the condensed water in condensate tank 31 is flowed in vapour generator 3 by service pump 32 and circulates.Enter seawater in first evaporator 21 through with steam heat-exchanging after produce secondary steam, secondary steam enters in the heat exchange coil of middle single-effect evaporator 22, seawater after concentrated in first evaporator 21 enters in middle single-effect evaporator 22 again and carries out heat exchange with secondary steam, become fresh water after secondary steam heat exchange and flow into fresh water tanks 5, producing new secondary steam after seawater heat absorption in middle single-effect evaporator 22 enters in the heat exchange pipe of last evaporator 23, seawater after again concentrated in middle single-effect evaporator 22 enter in last evaporator 23 with secondary steam heat exchange again, become fresh water after secondary steam heat exchange and flow into fresh water tanks 5, steam is produced by entering fresh water tanks 5 after the 3rd preheater 26 heat exchange after seawater heat absorption in last evaporator 23, seawater after concentrated is discharged from the discharge outlet of last evaporator 23.Seawater will carry out preheating by the 3rd preheater 26, second preheater 25 and the first preheater 24 successively before first evaporator 21.Solar energy photovoltaic generator 6 utilizes the oil circulating pump 12 in photovoltaic effect generation electrical energy drive system and service pump 32 to work.
Above-described embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection domain that the utility model claims determine.