CN104594966A - ORC (Organic Rankine Cycle) compressed air making device provided with liquid ejection device and method thereof - Google Patents
ORC (Organic Rankine Cycle) compressed air making device provided with liquid ejection device and method thereof Download PDFInfo
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- CN104594966A CN104594966A CN201510041800.2A CN201510041800A CN104594966A CN 104594966 A CN104594966 A CN 104594966A CN 201510041800 A CN201510041800 A CN 201510041800A CN 104594966 A CN104594966 A CN 104594966A
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Abstract
The invention relates to a medium and low-temperature residual heat recycling technology, and aims to provide an ORC (Organic Rankine Cycle) compressed air making device provided with a liquid ejection device and a method thereof. In the device, a turbine coaxial all-in-one machine is constructed by coaxially and directly connecting a turbine expander with a turbine compressor; the outlet end of a first working medium pump is connected with the working medium inlet of an evaporator; the working medium outlet of the evaporator is connected with the working medium inlet of the turbine expander; the working medium outlet of the turbine expander is connected to the ejection liquid inlet of the liquid ejector; the outlet end of the liquid ejector is connected to the inlets of a first-stage working medium pump and a second-stage working medium pump respectively through a condenser; the working fluid inlet of the liquid ejector is connected with the outlet of the second-stage working medium pump. Medium and low-temperature residual heat is recovered through ORC, and is used for making compressed air; exhaust gas of the expander is taken as fluid ejected by the ejector, so that the back pressure of the expander can be lowered; the working pressure difference is increased, and the acting capability of an ORC cycle is increased.
Description
Technical field
The present invention relates to Low and mid temperature heat recovery and utilize technical field, especially relate to a kind of ORC with liquid ejection device and produce compressed air plant and method.
Background technique
In all conglomeraties such as iron and steel, non-ferrous metal, petrochemical industry, building materials, light industry, there is a large amount of low grade residual heat in manufacturing enterprise, and comprise flue gas, steam and hot water etc., these heat grades are low, and quantity is large, point spreading, substantially can not for producing recycling.Under the large Policy Background of current energy-saving and emission-reduction, residual-heat utilization technology is more and more subject to the attention of industrial quarters and academia, promotes industrial middle-low temperature heat and produces the important way that pressurized air is the utilization of a kind of low grade residual heat.
Adopt organic working medium to replace the organic Rankine bottoming cycle (ORC) of water vapor although can make middle low-temperature heat source utilize expanded range, but because the difference between the temperature of middle low-temperature heat source and ambient temperature is less, inflation process operating pressure differential is little, therefore acting ability is low, energy conversion rate is low, what thus limit that middle low-temperature heat source ORC generates electricity applies, and ORC produces pressurized air and do not have correlation technique and application report.
Fluid mechanics ejectors technique is applied to ORC, acting ability and the energy efficiency of ORC system can be improved.Ejector has with high-pressure energy to reduce the feature of driven fluid pressure, and therefore ejector is applied to ORC, the exhaust of decompressor, by after ejector injection, can reduce the back pressure of decompressor, increase its operating pressure differential.Meanwhile, adopt the liquid ejecting device of non-steam type, avoid and input the heat of ejector, make system under the identical heat condition of input, the output work not only making ORC circulate increases, and its thermal efficiency have also been obtained and significantly improves simultaneously.
But, in ORC power generation system, owing to entering the random fluctuation of decompressor working medium flow and pressure, working medium can not fully effective steadily expansion work (expansion ratio of general screw expander controls at about 1:4) in decompressor, cause rotary speed unstabilization fixed, affect the stability of ORC systems generate electricity, reduce generating efficiency.If utilize decompressor Direct driver air compressor, normal air is compressed.Pressurized air is directly incorporated into gas pipeline network by after voltage stabilizing (decompression), and the energy efficiency of system can significantly improve.
Pressurized air is the second largest power source being only second to electric power, be again the technique source of the gas served many purposes, its application area is throughout industry and departments such as oil, chemical industry, metallurgy, electric power, machinery, light industry, weaving, automobile making, electronics, food, medicine, biochemistry, national defence, scientific researches.Existing pressurized air preparation method often needs a large amount of energy consumptions, if adopt ORC to produce pressurized air, greatly can reduce the energy consumption of process industry, improve energy efficiency.
At present, do not find both at home and abroad to utilize ORC to produce compressed-air actuated application, the present invention brings brand-new pressurized air ideas of energy-saving, utilizes free industrial middle-low temperature heat to produce pressurized air.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, provides a kind of ORC with liquid ejection device to produce compressed air plant and method.
For technical solution problem, the technical solution adopted in the present invention is:
There is provided a kind of ORC with liquid ejection device to produce compressed air plant, comprise vaporizer, turbine coaxial all-in-one machine, liquid ejecting device, condenser, first order working medium pump and second level working medium pump, realize connecting by pipeline between each equipment; Described turbine coaxial all-in-one machine is by turbo-expander and the coaxial direct connection of turbocompressor, and turbo-expander is used for expansion work, and turbocompressor is used for producing pressurized air; Wherein, turbo-expander is provided with working medium entrance and sender property outlet, and turbocompressor is provided with air inlet and compressed air outlet;
Realize connecting by pipeline between each equipment: the outlet end of the first working medium pump connects with the working medium entrance of vaporizer, the sender property outlet of vaporizer connects with the working medium entrance of turbo-expander, the sender property outlet of turbo-expander is connected to the driving fluid entrance of liquid ejecting device, the outlet end of liquid ejecting device is connected to the entrance of first order working medium pump and second level working medium pump respectively through condenser, the Working-fluid intaking of liquid ejecting device connects with second level working medium delivery side of pump; Vaporizer is provided with thermal source inlet end and thermal source outlet end.
In the present invention, described condenser is the condenser of air cooling or water-cooled.
Invention further provides and utilize described device to realize ORC to produce compressed-air actuated method, comprising:
Low pressure (1 ~ 2.5bar) liquid organic working medium sends into vaporizer after being pressurised into supercooled liquid by the first working medium pump, the energy conversion absorbed from middle-low temperature heat (80 ~ 300 DEG C) is high pressure (5 ~ 10bar) high temperature (60 ~ 80 DEG C) steam, then is imported into turbo-expander; While turbo-expander expansion work, drive the turbocompressor of direct connection to compress normal air, realize output squeezing air; After turbo-expander acting, organic working medium enters liquid ejecting device with the vaporous form of 1.5 ~ 3bar, is entrainmented, mixes rear discharge, and send into condenser by the supercooled liquid organic working medium from the second working medium pump outlet; After low-temperature receiver heat release, organic working medium is condensed into liquid state, then is back to the entrance of first order working medium pump and second level working medium pump, realizes reciprocation cycle with this.
In the present invention, described middle-low temperature heat refers to: flue gas, steam or hot water.
In the present invention, described low-temperature receiver is air or water: if adopt air-cooled condenser, low-temperature receiver is air; If employing water-cooled condenser, low-temperature receiver is water.
In the present invention, described organic working medium is freon.In particular application, silicone oil or carbon dioxide also can be used as working medium.
Compared with prior art, the invention has the beneficial effects as follows:
1, realize Low and mid temperature heat recovery to utilize, and for producing the large pressurized air of requirement in industrial processes;
2, produce on compressed air system basis at conventional ORC, set up liquid ejecting device and second level working medium pump, expander exhaust gas, as by the fluid of ejector injection, can reduce the back pressure of decompressor, increases its operating pressure differential, to improve the acting ability of ORC circulation.
Accompanying drawing explanation
Fig. 1 is that ORC of the present invention produces compressed-air actuated device schematic diagram;
Fig. 2 is turbine coaxial all-in-one machine schematic diagram.
Be labeled as in figure: vaporizer 1, turbine coaxial all-in-one machine 2, liquid ejecting device 3, condenser 4, first order working medium pump 5, second level working medium pump 6, turbo-expander 7, turbocompressor 8.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
Present invention utilizes this technology of ejector.Ejector is the turbulent diffusion utilizing jet, and the two fluids of different pressures is mixed mutually, and causes fluid machinery and the mix reaction equipment of energy interchange.Before inletting device, the higher fluid of pressure, working fluid, flows out from nozzle with very high speed.Due to the turbulent diffusion of jet, there is momentum transfer in the fluid two entrainmenting surrounding.What the pressure be sucked away was lower is driving fluid.
The ORC with liquid ejection device in the present invention produces compressed air plant, comprises vaporizer 1, turbine coaxial all-in-one machine 2, liquid ejecting device 3, condenser 4, first order working medium pump 5 and second level working medium pump 6, and condenser 4 is condensers of air cooling or water-cooled.
Turbine coaxial all-in-one machine 2 is by turbo-expander 7 and the coaxial direct connection of turbocompressor 8, and turbo-expander 7 is for expansion work, and turbocompressor 8 is for producing pressurized air; Wherein, turbo-expander 7 is provided with working medium entrance and sender property outlet, and turbocompressor 8 is provided with air inlet and compressed air outlet.When turbine coaxial all-in-one machine 2 works, turbo-expander 7 is connected with turbocompressor 8 coaxial constant-speed, avoids different driven off by shaft mechanical efficiency loss, improves and produce compressed-air actuated whole efficiency.
Realize connecting by pipeline between each equipment: the outlet end of the first working medium pump 5 connects with the working medium entrance of vaporizer 1, the sender property outlet of vaporizer 1 connects with the working medium entrance of turbo-expander 7, the sender property outlet of turbo-expander 7 is connected to the driving fluid entrance of liquid ejecting device 3, the outlet end of liquid ejecting device 3 is connected to the entrance of first order working medium pump 5 and second level working medium pump 6 respectively through condenser 4, the Working-fluid intaking of liquid ejecting device 3 connects with the outlet of second level working medium pump 6; Vaporizer 1 is provided with thermal source inlet end and thermal source outlet end.
Device in the present invention is provided with control system, not only realize the basic controlling of the electric and instrument relevant to device, and by arranging sensor on pipeline, by the aperture of regulating and controlling valve, reaching and improving the optimum condition effect of turbo-expander 7 and the reliability of system.Turbine coaxial all-in-one machine 2 establishes lubricating oil system.
In the present invention, low pressure (1 ~ 2.5bar) organic working medium sends into vaporizer 1 after being pressurised into supercooled liquid by the first working medium pump 5, the energy conversion absorbed from middle-low temperature heat (80 ~ 300 DEG C) is high pressure (5 ~ 10bar) high temperature (60 ~ 80 DEG C) steam, then is imported into turbo-expander 7; While turbo-expander 7 expansion work, drive turbocompressor 8 pairs of normal air of direct connection to compress, realize output squeezing air; After turbo-expander 7 does work, organic working medium enters liquid ejecting device 3 with the form of low-pressure steam (1.5 ~ 3bar), is entrainmented, mixes rear discharge, and send into condenser 4 by the supercooled liquid organic working medium exported from the second working medium pump 6; To low-temperature receiver (if water-cooled pattern, cooling water about 30 DEG C; If air-cooled pattern, air normal temperature 20 DEG C) after heat release, organic working medium is condensed into liquid state, then is back to the entrance of first order working medium pump 5 and second level working medium pump 6, realizes reciprocation cycle with this.
In the present invention, middle-low temperature heat refers to flue gas, steam or hot water; Low-temperature receiver is water or air; Organic working medium is freon.
Claims (6)
1. the ORC with liquid ejection device produces a compressed air plant, comprises vaporizer; It is characterized in that, this device also comprises: turbine coaxial all-in-one machine, liquid ejecting device, condenser, first order working medium pump and second level working medium pump;
Described turbine coaxial all-in-one machine is by turbo-expander and the coaxial direct connection of turbocompressor, and turbo-expander is used for expansion work, and turbocompressor is used for producing pressurized air; Wherein, turbo-expander is provided with working medium entrance and sender property outlet, and turbocompressor is provided with air inlet and compressed air outlet;
Realize connecting by pipeline between each equipment: the outlet end of the first working medium pump connects with the working medium entrance of vaporizer, the sender property outlet of vaporizer connects with the working medium entrance of turbo-expander, the sender property outlet of turbo-expander is connected to the driving fluid entrance of liquid ejecting device, the outlet end of liquid ejecting device is connected to the entrance of first order working medium pump and second level working medium pump respectively through condenser, the Working-fluid intaking of liquid ejecting device connects with second level working medium delivery side of pump; Vaporizer is provided with thermal source inlet end and thermal source outlet end.
2. device according to claim 1, is characterized in that, described condenser is air-cooled condenser or water-cooled condenser.
3. utilize device described in claim 1 to realize ORC and produce compressed-air actuated method, it is characterized in that, comprising:
Send into vaporizer after the liquid organic working medium of 1 ~ 2.5bar is pressurised into supercooled liquid by the first working medium pump, the energy conversion absorbed from the middle-low temperature heat of 80 ~ 300 DEG C is 5 ~ 10bar, the steam of 60 ~ 80 DEG C, then is imported into turbo-expander; While turbo-expander expansion work, drive the turbocompressor of direct connection to compress normal air, realize output squeezing air; After turbo-expander acting, organic working medium enters liquid ejecting device with the vaporous form of 1.5 ~ 3bar, is entrainmented, mixes rear discharge, and send into condenser by the supercooled liquid organic working medium from the second working medium pump outlet; After low-temperature receiver heat release, organic working medium is condensed into liquid state, then is back to the entrance of first order working medium pump and second level working medium pump, realizes reciprocation cycle with this.
4. method according to claim 3, is characterized in that, described middle-low temperature heat refers to: flue gas, steam or hot water.
5. method according to claim 3, is characterized in that, described organic working medium is freon or silicone oil.
6. method according to claim 3, is characterized in that, described low-temperature receiver is air or water: if adopt air-cooled condenser, low-temperature receiver is air; If employing water-cooled condenser, low-temperature receiver is water.
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| CN201510041800.2A CN104594966A (en) | 2015-01-27 | 2015-01-27 | ORC (Organic Rankine Cycle) compressed air making device provided with liquid ejection device and method thereof |
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| CN201510041800.2A CN104594966A (en) | 2015-01-27 | 2015-01-27 | ORC (Organic Rankine Cycle) compressed air making device provided with liquid ejection device and method thereof |
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Cited By (2)
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| CN109026237A (en) * | 2018-08-30 | 2018-12-18 | 西安交通大学 | A kind of organic working medium power cycle generating system coordinated control system and method |
| CN111997697A (en) * | 2020-07-21 | 2020-11-27 | 上海齐耀膨胀机有限公司 | Organic Rankine cycle system with ejector |
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| CN204511540U (en) * | 2015-01-27 | 2015-07-29 | 杭州哲达科技股份有限公司 | ORC with liquid ejection device produces compressed air plant |
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| CN109026237A (en) * | 2018-08-30 | 2018-12-18 | 西安交通大学 | A kind of organic working medium power cycle generating system coordinated control system and method |
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