CN204225941U - A kind of system utilizing low pressure steam to carry out secondary generating - Google Patents
A kind of system utilizing low pressure steam to carry out secondary generating Download PDFInfo
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- CN204225941U CN204225941U CN201420653764.6U CN201420653764U CN204225941U CN 204225941 U CN204225941 U CN 204225941U CN 201420653764 U CN201420653764 U CN 201420653764U CN 204225941 U CN204225941 U CN 204225941U
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Abstract
The utility model discloses a kind of system utilizing low pressure steam to carry out secondary generating, native system comprises first order power generation system and second level power generation system; Described first order power generation system comprises the first decompressor, vaporizer, low pressure steam circulation loop, the first generator and speed reducer; Described second power generation system comprises described vaporizer, the second decompressor, condenser, working medium pump, organic Rankine working medium circulation pipeline and the second generator; Described low pressure steam circulation loop and described organic Rankine working medium circulation pipeline carry out heat exchange by described vaporizer.Native system had both taken full advantage of the pressure difference energy of low pressure steam, has recycled again a large amount of latent heat diffused of weary steam, the generated energy of system is increased greatly.
Description
Technical field
The utility model relates to the technical field of low pressure steam generating, particularly relates to a kind of system utilizing low pressure steam to carry out secondary generating.
Background technique
China is in industrialization, urbanization Rapid development stage, and social development is to the contradiction of energy demand and environmental protection; Therefore, present stage, national policy increases the supporting dynamics to energy-saving and environmental protection, and the important meaning of energy-saving and environmental protection has obtained the extensive accreditation of society.In China, cogeneration technology is an emerging technology, utilize the low pressure steam of industrial afterheat recovery to generate electricity and be in the starting stage, there are a lot of exhaust heat boilers in industrial and mining enterprise of China, the low-quality saturated vapour that annual generation is a large amount of and wet vapor, except a small amount of life vapour and winter heating are used, major part does not make full use of.At present, there is the problems such as UTILIZATION OF VESIDUAL HEAT IN is insufficient, generating efficiency is low, Economy is not good, system imperfection in low pressure steam power generation system; Therefore, fail to be widely used in industrial exhaust heat and utilize system.How to improve the stability of low pressure steam power generation system, improve generating efficiency, reduce investment and the cost of unit generating, make low pressure steam generating maturation be applied to industrial exhaust heat and utilize system, become the difficult problem of low pressure steam generating to business enterprise expand.
The average absolute electrical efficiency of countries in the world Turbo-generator Set is 30-35%, and the absolute electrical efficiency of advanced high-power unit also only reaches more than 40%.This is mainly because also exist very large cold source energy in whole thermodynamic cycle, and namely by the steam that fuel heats, its a big chunk heat is recycled water-band and goes out outside thermodynamic cycle not to be utilized in vapour condenser, and this part heat accounts for about 44% of system.Overheated or the saturated vapour for mesolow, adopts condensing steam turbine or screw expander once to generate electricity at present, then this part cold source energy accounts for steam and brings the ratio of heat into more greatly, and electrical efficiency is lower.
Improving the utilization ratio of thermal source, make full use of each ladder energy of steam, reduce not by the cold source energy that system utilizes simultaneously, is the effective means improving the absolute electrical efficiency of generator.In view of this, the utility model people is through a large amount of practices and long-term exploration, and study and devise a kind of system utilizing low pressure steam to carry out secondary generating, this case produces thus.
Model utility content
The purpose of this utility model is to provide a kind of system utilizing low pressure steam to carry out secondary generating, to solve the current low pressure steam generating waste-heat problem such as utilize the large and generating efficiency of insufficient, that cold source energy accounts for thermal source ratio low.
The technological scheme adopted that the utility model solves its technical problem is:
Utilize low pressure steam to carry out a system for secondary generating, native system comprises first order power generation system and second level power generation system; Described first order power generation system comprises the first decompressor, vaporizer, low pressure steam circulation loop, the first generator and speed reducer, described first decompressor and described vaporizer are successively set on described low pressure steam circulation loop, and described first generator connects described first decompressor by described speed reducer; Described second power generation system comprises described vaporizer, the second decompressor, condenser, working medium pump, organic Rankine working medium circulation pipeline and the second generator, described vaporizer, described second decompressor, described condenser and described working medium pump are successively set on described organic Rankine working medium circulation pipeline, and described second generator is connected with described second decompressor; Described low pressure steam circulation loop and described organic Rankine working medium circulation pipeline carry out heat exchange by described vaporizer.
As the optimal way of embodiment, native system also comprises condenser system, described condenser system comprises the described condenser, condensing tower and the circulating water pump that are connected in turn on condensate water circulatory pipeline, and described organic Rankine working medium circulation pipeline and described condensate water circulatory pipeline carry out heat exchange by described condenser.
As the optimal way of embodiment, described first decompressor is full stream back pressure screw expander.
As the optimal way of embodiment, native system also comprises the first manually operated valve, first be arranged on described low pressure steam circulation loop and cuts valve, the first modulating valve and the second manually operated valve soon, and described first manually operated valve, described first is cut before valve and described first modulating valve be successively set on described first decompressor soon; Described second manually operated valve is arranged between described first decompressor and described vaporizer.
As the optimal way of embodiment, native system also comprises and is arranged on second on described organic Rankine working medium circulation pipeline and cuts valve, the 3rd manually operated valve, the 4th manually operated valve, the 5th manually operated valve and the 6th manually operated valve soon, described second cuts valve and described 3rd manually operated valve is arranged between described vaporizer and described second decompressor soon, described 4th manually operated valve is arranged between described second decompressor and described condenser, and described 5th manually operated valve and described 6th manually operated valve are separately positioned on described working medium pump both sides.
As the optimal way of embodiment, native system also comprises and is arranged on the 7th manually operated valve on described condensate water circulatory pipeline and the 8th manually operated valve, and described 7th manually operated valve and described 8th manually operated valve are separately positioned on the both sides of described circulating water pump.
A kind of method utilizing low pressure steam to carry out secondary generating, saturated vapour is entered by the inlet pipe of described low pressure steam circulation loop, in described first decompressor acting, described first decompressor drives described first generator to generate electricity by described speed reducer, overheated or saturated vapour becomes low pressure wet vapor after going out the first decompressor, enter described vaporizer, described low pressure wet vapor carries out heat exchange with the organic working medium of described organic Rankine working medium circulation pipeline in described vaporizer, change condensed water into discharge, after lower boiling organic working medium absorbs heat, be gaseous state by liquid state, gas organic working medium is in described second decompressor acting, described second decompressor drives described second electrical power generators, after gas organic working medium goes out the second decompressor, temperature and pressure reduce, heat exchange is carried out with the condensed water on described condensate water circulatory pipeline in described condenser, change liquid state into, return to described vaporizer through described working medium pump again, enter next work cycle.
As the optimal way of embodiment, the saturated vapour of 1.3-10Mpa is entered by the inlet pipe of described low pressure steam circulation loop, in described first decompressor acting, described first decompressor drives described first generator to generate electricity by described speed reducer, overheated or saturated vapour becomes the low pressure wet vapor of 0.1-0.3Mpa after going out the first decompressor, enter described vaporizer, described low pressure wet vapor carries out heat exchange with the organic working medium of described organic Rankine working medium circulation pipeline in described vaporizer, change <80 DEG C of condensed water into discharge, after lower boiling organic working medium absorbs heat, be gaseous state by liquid state, 200-280 DEG C, the gas organic working medium of 4MPa is in described second decompressor acting, described second decompressor drives described second electrical power generators, after gas organic working medium goes out the second decompressor, temperature and pressure reduce, heat exchange is carried out with the condensed water on described condensate water circulatory pipeline in described condenser, change the liquid of 30-40 DEG C into, return to described vaporizer through described working medium pump again, enter next work cycle.
After adopting said structure, the utility model is according to the different qualities of steam, vapor pressure is rationally divided into secondary, and generate electricity for two-stage tandem, the thermal power transfer that first order generating effectively make use of steam becomes the swiftly flowing kinetic energy of steam, and second level generating, by weary steam and low boiling working fluid heat exchange, effectively make use of the latent heat of steam, reduce the cold source energy of generator set system, improve generated energy.The utility model serves the dual social effect into enterprise's cost efficiency and energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1, the utility model discloses a kind of system utilizing low pressure steam to carry out secondary generating, and native system comprises first order power generation system 1 and second level power generation system 2; Described first order power generation system 1 comprises the first decompressor 11, vaporizer 12, low pressure steam circulation loop 13, first generator 14 and speed reducer 15, described first decompressor 11 and described vaporizer 12 are successively set on described low pressure steam circulation loop 13, and described first generator 14 connects described first decompressor 11 by described speed reducer 15; Described second power generation system 2 comprises described vaporizer 21, second decompressor 22, condenser 23, working medium pump 24, organic Rankine working medium circulation pipeline 25 and the second generator 26, described vaporizer 21, described second decompressor 22, described condenser 23 and described working medium pump 24 are successively set on described organic Rankine working medium circulation pipeline 25, and described second generator 22 is connected with described second decompressor 22; Described low pressure steam circulation loop 13 carries out heat exchange with described organic Rankine working medium circulation pipeline 25 by described vaporizer 12 (21).
As the optimal way of embodiment, native system also comprises condenser system 3, described condenser system 3 comprises the described condenser 31 be connected in turn on condensate water circulatory pipeline 30, condensing tower 32 and circulating water pump 33, and described organic Rankine working medium circulation pipeline 25 carries out heat exchange with described condensate water circulatory pipeline 30 by described condenser 23 (31).
As the optimal way of embodiment, described first decompressor 11 is full stream back pressure screw expander; Described full stream back pressure screw expander can adapt to inferior steam, when vapour, liquid two-phase medium exist simultaneously, and normal power generation; Because between its component, gap is little, interior flow velocity is also lower, thus can obtain higher internal efficiency, than the efficiency height 10-15% of same power steam turbine of the same type.Because the maximum feature of heat recovery steam is exactly operating mode instability, therefore, screw expander can adapt to various operating mode well; At present, cogeneration adopts the one-level that is of screw expander generating to generate electricity, and exports weary steam and directly drains, cause using energy source insufficient, meanwhile, also cause the wasting of resources of condensed water.
As the optimal way of embodiment, native system also comprises the first manually operated valve 16, first be arranged on described low pressure steam circulation loop 13 and cuts valve 17, first modulating valve 18 and the second manually operated valve 19 soon, and described first manually operated valve 16, described first is cut before valve 17 and described first modulating valve 19 be successively set on described first decompressor 11 soon; Described second manually operated valve 19 is arranged between described first decompressor 11 and described vaporizer 12 (21).
As the optimal way of embodiment, native system also comprises and is arranged on second on described organic Rankine working medium circulation pipeline 25 and cuts valve 26 soon, 3rd manually operated valve 27, 4th manually operated valve 28, 5th manually operated valve 291 and the 6th manually operated valve 292, described second cuts valve 26 and described 3rd manually operated valve 27 is arranged between described vaporizer 12 (21) and described second decompressor 22 soon, described 4th manually operated valve 28 is arranged between described second decompressor 22 and described condenser 23 (31), described 5th manually operated valve 291 and described 6th manually operated valve 292 are separately positioned on described working medium pump 24 both sides.
As the optimal way of embodiment, native system also comprises and is arranged on the 7th manually operated valve 34 on described condensate water circulatory pipeline 30 and the 8th manually operated valve 35, and described 7th manually operated valve 34 and described 8th manually operated valve 35 are separately positioned on the both sides of described circulating water pump.
Described manually operated valve and cut valve soon as used during inspect and change pipeline equipment; Used when described modulating valve is for regulating pressure, during overpressure, turn down.
A kind of method utilizing low pressure steam to carry out secondary generating, saturated vapour is entered by the inlet pipe of described low pressure steam circulation loop, in described first decompressor acting, described first decompressor drives described first generator to generate electricity by described speed reducer, overheated or saturated vapour becomes low pressure wet vapor after going out the first decompressor, enter described vaporizer, described low pressure wet vapor carries out heat exchange with the organic working medium of described organic Rankine working medium circulation pipeline in described vaporizer, change condensed water into discharge, after lower boiling organic working medium absorbs heat, be gaseous state by liquid state, gas organic working medium is in described second decompressor acting, described second decompressor drives described second electrical power generators, after gas organic working medium goes out the second decompressor, temperature and pressure reduce, heat exchange is carried out with the condensed water on described condensate water circulatory pipeline in described condenser, change liquid state into, return to described vaporizer through described working medium pump again, enter next work cycle, the all right recycling use of condensed water on described condensate water circulatory pipeline, saving water resource, reduces the expense of enterprise's water treatment.
As the optimal way of embodiment, the saturated vapour of 1.3-10Mpa is entered by the inlet pipe of described low pressure steam circulation loop, in described first decompressor acting, described first decompressor drives described first generator to generate electricity by described speed reducer, overheated or saturated vapour becomes the low pressure wet vapor of 0.2Mpa after going out the first decompressor, enter described vaporizer, described low pressure wet vapor carries out heat exchange with the organic working medium of described organic Rankine working medium circulation pipeline in described vaporizer, change <80 DEG C of condensed water into discharge, after lower boiling organic working medium absorbs heat, be gaseous state by liquid state, 200-280 DEG C, the gas organic working medium of 4MPa is in described second decompressor acting, described second decompressor drives described second electrical power generators, after gas organic working medium goes out the second decompressor, temperature and pressure reduce, heat exchange is carried out with the condensed water on described condensate water circulatory pipeline in described condenser, change the liquid of 35 DEG C into, return to described vaporizer through described working medium pump again, enter next work cycle.
At certain produerr gas plant, the steam of heat recovery is the saturated vapour of 1.3MPa, and adopt the scheme of one-level full-flow screw machine generating, net electric generation is 300KW; Adopt the scheme of one-level low boiling working fluid generating, net electric generation is 450KW; And adopt the scheme that two-stage tandem of the present utility model generates electricity, net electric generation is 500KW, and the low 1000 yuan/KW of output investment ratio one-level low boiling working fluid generating of two-stage tandem generating, net electric generation is incorporated to the power supply system of our factory for our factory, can be enterprise's generating synergy about 2,300,000 yuan every year.Therefore, the utility model is generated electricity by generator two-stage tandem, has both taken full advantage of the pressure difference energy of low pressure steam, has recycled again a large amount of latent heat diffused of weary steam, the generated energy of system is increased greatly.It is high that the utility model has systems generate electricity efficiency, system run all right, and construction investment is economized, the advantages such as the investment repayment phase is short, and investment risk is little.
Above are only embodiment of the present utility model, but design concept of the present utility model is not limited thereto, all changes utilizing this design the utility model to be carried out to unsubstantiality, all should belong to the behavior of invading the utility model protection domain.
Claims (7)
1. utilize low pressure steam to carry out a system for secondary generating, it is characterized in that: native system comprises first order power generation system and second level power generation system; Described first order power generation system comprises the first decompressor, vaporizer, low pressure steam circulation loop, the first generator and speed reducer, described first decompressor and described vaporizer are successively set on described low pressure steam circulation loop, and described first generator connects described first decompressor by described speed reducer; Described second power generation system comprises described vaporizer, the second decompressor, condenser, working medium pump, organic Rankine working medium circulation pipeline and the second generator, described vaporizer, described second decompressor, described condenser and described working medium pump are successively set on described organic Rankine working medium circulation pipeline, and described second generator is connected with described second decompressor; Described low pressure steam circulation loop and described organic Rankine working medium circulation pipeline carry out heat exchange by described vaporizer.
2. a kind of system utilizing low pressure steam to carry out secondary generating as claimed in claim 1, it is characterized in that: native system also comprises condenser system, described condenser system comprises the described condenser, condensing tower and the circulating water pump that are connected in turn on condensate water circulatory pipeline, and described organic Rankine working medium circulation pipeline and described condensate water circulatory pipeline carry out heat exchange by described condenser.
3. a kind of system utilizing low pressure steam to carry out secondary generating as claimed in claim 1, is characterized in that: described first decompressor is full stream back pressure screw expander.
4. a kind of system utilizing low pressure steam to carry out secondary generating as claimed in claim 1, it is characterized in that: native system also comprises the first manually operated valve, first be arranged on described low pressure steam circulation loop and cuts valve, the first modulating valve and the second manually operated valve soon, described first manually operated valve, described first is cut before valve and described first modulating valve be successively set on described first decompressor soon; Described second manually operated valve is arranged between described first decompressor and described vaporizer.
5. a kind of system utilizing low pressure steam to carry out secondary generating as claimed in claim 1, it is characterized in that: native system also comprises and is arranged on second on described organic Rankine working medium circulation pipeline and cuts valve soon, 3rd manually operated valve, 4th manually operated valve, 5th manually operated valve and the 6th manually operated valve, described second cuts valve and described 3rd manually operated valve is arranged between described vaporizer and described second decompressor soon, described 4th manually operated valve is arranged between described second decompressor and described condenser, described 5th manually operated valve and described 6th manually operated valve are separately positioned on described working medium pump both sides.
6. a kind of system utilizing low pressure steam to carry out secondary generating as claimed in claim 2, it is characterized in that: native system also comprises and is arranged on the 7th manually operated valve on described condensate water circulatory pipeline and the 8th manually operated valve, and described 7th manually operated valve and described 8th manually operated valve are separately positioned on the both sides of described circulating water pump.
7. a kind of system utilizing low pressure steam to carry out secondary generating as claimed in claim 1, is characterized in that: the steam that the inlet pipe of described low pressure steam circulation loop enters is the saturated vapour of 1.3-10Mpa.
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| CN201420653764.6U CN204225941U (en) | 2014-03-21 | 2014-11-04 | A kind of system utilizing low pressure steam to carry out secondary generating |
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| CN201420132105 | 2014-03-21 | ||
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| CN201420653764.6U CN204225941U (en) | 2014-03-21 | 2014-11-04 | A kind of system utilizing low pressure steam to carry out secondary generating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121754A (en) * | 2016-06-29 | 2016-11-16 | 南京航空航天大学 | Step recycles ORC system and the method for low-grade heat |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106121754A (en) * | 2016-06-29 | 2016-11-16 | 南京航空航天大学 | Step recycles ORC system and the method for low-grade heat |
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Address after: 361009, Huli District, Huli District, Fujian, 1901, Huli building, room 619, Xiamen Patentee after: Chengxin Integrated Technology Co., Ltd. Address before: 361009, Huli District, Huli District, Fujian, 1901, Huli building, room 619, Xiamen Patentee before: Chengxin Green Integration Co., Ltd. |