CN102619567A - Power system utilizing excessive steam pressure of two-stage screw expansion machine - Google Patents
Power system utilizing excessive steam pressure of two-stage screw expansion machine Download PDFInfo
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- CN102619567A CN102619567A CN2012101208775A CN201210120877A CN102619567A CN 102619567 A CN102619567 A CN 102619567A CN 2012101208775 A CN2012101208775 A CN 2012101208775A CN 201210120877 A CN201210120877 A CN 201210120877A CN 102619567 A CN102619567 A CN 102619567A
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Abstract
The invention discloses a power system utilizing the excessive steam pressure of a two-stage screw expansion machine. The power system is characterized by comprising a primary air inlet valve, a primary inlet regulating valve, a primary screw expansion machine, an interstage heat exchanger, a secondary air inlet valve, a secondary inlet regulating valve and a secondary screw expansion machine, wherein high-temperature high-pressure steam enters the primary air inlet valve and the primary inlet regulating valve, the primary inlet regulating valve, the primary screw expansion machine through a pipeline and drives a load or a generator to generate power; and medium-temperature medium-pressure steam output from the primary screw expansion machine enters the interstage heat exchanger, is heated by the interstage heat exchanger and output to the secondary air inlet valve, the secondary inlet regulating valve and the secondary screw expansion machine through the interstage heat exchanger, and drives another load or another generator to generate power. The system has the advantages of fully recycling waste heat, along with high heat utilization efficiency.
Description
Technical field
The present invention relates to utilize the power system of two-stage screw expander steam overbottom pressure.
Background technique
Along with in the commercial production to the attention of the utilization of the reducing energy consumption of equipment and secondary energy, industrial overbottom pressure waste heat begins to obtain to utilize.Screw expansion motor receives more and more users' approval because of it in the superperformance characteristic that low-quality thermal source reclaims the field.Yet still there are some defectives in the direct driving force formula screw expander that is used in the system of high pressure steam energy recovery at present, as: the gap is bigger, and single-stage expansion is than low, and mechanical loss is big, and efficient is lower.When particularly requiring screw expander under higher isentropic efficiency operating mode, to move, expansion ratio is generally 3～6, and the expansion ratio in efficient district is generally 3～4, in case expansion ratio greater than 7, Isentropic Efficiency will obviously reduce.Because screw expander is a displacement type expander, receive condition restriction such as mechanical dimensions in addition, the single-stage unit is difficult to some elevated pressures thermals source are made full use of, and energy utilization rate is lower.
Summary of the invention
The objective of the invention is to overcome the single stage screw decompressor and reclaim the defective in field, provide a kind of and can make full use of steam overbottom pressure resource, improve a kind of power system of utilizing two-stage screw expander steam overbottom pressure of energy utilization efficiency at the overbottom pressure steam energy.
The technological scheme that the present invention takes is: a kind of power system of utilizing two-stage screw expander steam overbottom pressure; It is characterized in that; Comprise: through one-level suction valve, one-level inlet modulating valve, one-level screw expander, the inter-stage heat exchanger that pipeline is linked in sequence, secondary suction valve, secondary inlet modulating valve, secondary screw expander;
High temperature and high pressure steam gets into one-level suction valve, one-level modulating valve entering one-level screw expander through pipeline, drives a load or drives a generator for electricity generation; Get into interstage heat exchanger again from the medium temperature and medium pressure steam of one-level screw expander output,, drive another load or drive another generator for electricity generation through outputing to secondary suction valve, secondary modulating valve entering secondary screw expander after this interstage heat exchanger heating.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure wherein, also comprises a level security valve and a secondary safety valve one by one, is separately positioned on the output terminal of said one-level screw expander and said secondary screw expander.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure; Wherein, The input end of described one-level inlet modulating valve also comprises a speed probe or power sensor; Rotating speed or power signal that described one-level inlet modulating valve is gathered the one-level screw expander through described speed probe or power sensor come the regulating and controlling valve opening, to regulate the flow of the steam that gets into this one-level screw expander.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure; Wherein, The input end of described secondary inlet modulating valve also comprises a speed probe or power sensor; Rotating speed or power signal that described secondary inlet modulating valve is gathered the secondary screw expander through described speed probe or power sensor come the regulating and controlling valve opening, to regulate the flow of the steam that gets into this secondary screw expander.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure, wherein, described interstage heat exchanger also comprises a high temperature heat source inlet opening, the input high temperature heat source is to the medium temperature and medium pressure steam heating in the tube side of this interstage heat exchanger.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure, wherein, described interstage heat exchanger also comprises an exhaust vent, discharges through pipeline.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure, wherein, described interstage heat exchanger also comprises a high temperature and high pressure steam inlet opening, the input high temperature and high pressure steam is to the medium temperature and medium pressure steam heating in the tube side of this interstage heat exchanger.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure, wherein, described interstage heat exchanger also comprises a high temperature and high pressure steam delivery outlet, is connected with said one-level suction valve through pipeline.
Above-mentioned a kind of power system of utilizing two-stage screw expander steam overbottom pressure, wherein, described system also comprises outfit lubricating oil system, cooling water system and electric meter control gear;
Described lubricating oil system provides the lubricant oil of certain pressure for sealing, bearing and the equalizing piston of each screw expander and helical-lobe compressor;
Described cooling water system is in order to cool off said lubricant oil and sealing;
Described electric meter control gear guarantees the normal operation of unit in order to related parameter collection is arranged, the monitoring of this system.
The present invention has the following advantages owing to adopted the two-stage screw expander to the system that industrial overbottom pressure residual heat resources reclaim:
1, adopt the double expansion flow process, irretrievable energy reclaims through compound expansion again in the steam source after can expanding to one-level, and is more abundant to the UTILIZATION OF VESIDUAL HEAT IN that reclaims, and improved the utilization ratio of heat;
2, adopt the inter-stage heat exchanger, reclaim through compound expansion again after the raising superheat temperature, can increase the fallen enthalpy of the steam of compound expansion, improve the energy output power;
3, utilize the high-pressure and high-temperature steam that gets into before one-level expands that the medium temperature and medium pressure steam that gets into the compound expansion machine is heated, can reduce the operating temperature of one-level screw expander, improve the main frame reliability of operation;
4, adopt screw expander that residual heat resources are recycled, the wet vapor that air inlet is contained drop has good adaptability, and it is strong that variable working condition is adapted to row; Simple in structure, easy to maintenance, vibrate little, efficient is high; Unit efficiency is mild with the variation of load and parameter, and reliability is high.
Description of drawings
Fig. 1 is a kind of embodiment's of the present invention's power system of utilizing two-stage screw expander steam overbottom pressure a schematic diagram.
Fig. 2 is the another kind of embodiment's of the present invention's power system of utilizing two-stage screw expander steam overbottom pressure a schematic diagram.
Embodiment
Below in conjunction with concrete embodiment and accompanying drawing thereof behavior characteristics of the present invention is done further to describe.
See also Fig. 1, Fig. 1 is a kind of embodiment's of the present invention's power system of utilizing two-stage screw expander steam overbottom pressure a schematic diagram.The present invention includes one-level suction valve 11, one-level inlet modulating valve 12, one-level screw expander 13, inter-stage heat exchanger 14, secondary suction valve 15, secondary modulating valve 16, secondary screw expander 17.High temperature and high pressure steam from industrial enterprise at first gets into one-level suction valve 11 through suction line; Get into one-level screw expander 13 again; Be provided with inlet modulating valve 12 at one-level screw expander 13 inlets; The input end of described one-level inlet modulating valve 12 also comprises a speed probe or power sensor; Rotating speed or power signal that described one-level inlet modulating valve is gathered the one-level screw expander through described speed probe or power sensor come the regulating and controlling valve opening, to regulate the flow of the steam that gets into this one-level screw expander.Steam gets into one-level screw expander 13 acting of expanding and drives and become medium temperature and medium pressure gas after loads or a generator 100 generatings and get into interstage heat exchanger 14 and heated by the HTHP byproduct steam from industrial enterprise again; Improve superheat temperature; Get into secondary screw expander 17 through secondary suction valve 15 then; Secondary screw expander 17 inlets also are provided with inlet modulating valve 16; The input end of this secondary inlet modulating valve also comprises a speed probe or power sensor; Described secondary inlet modulating valve comes the regulating and controlling valve opening through the rotating speed or the power signal of described speed probe or this secondary screw expander of power sensor collection, to regulate the flow of the steam that gets into this secondary screw expander.Become the discharge of low-temp low-pressure gas after steam entering secondary screw expander expansion 8 actings and drive another load or 200 generatings of another generator simultaneously.
For guaranteeing operational safety; A kind of power system of utilizing two-stage screw expander steam overbottom pressure of the present invention; Wherein, also comprise a level security valve 18 and a secondary safety valve 19 one by one, be separately positioned on the output terminal of said one-level screw expander and said secondary screw expander.When ducted vapor pressure superelevation, can pass through this safety valve pressure release.
The present invention is a kind of to be utilized in the power system of two-stage screw expander steam overbottom pressure; The shell side of described interstage heat exchanger also comprises a high temperature and high pressure steam inlet opening 141, and the input high temperature and high pressure steam is to the medium temperature and medium pressure steam heating in the tube side of this interstage heat exchanger.The shell side of described interstage heat exchanger also comprises a high temperature and high pressure steam delivery outlet 142, is connected with said one-level suction valve through pipeline, and the output high temperature and high pressure steam is to the one-level suction valve.
See also Fig. 2, Fig. 2 is the another kind of embodiment's of the present invention's power system of utilizing two-stage screw expander steam overbottom pressure a schematic diagram.The present invention includes the one-level suction valve 21, one-level inlet modulating valve 22, one-level screw expander 23, the inter-stage heat exchanger 24 that are linked in sequence through pipeline, secondary suction valve 25, secondary inlet modulating valve 26, secondary screw expander 27.From the HTHP byproduct steam of industrial enterprise through suction line at first through one-level suction valve 21; Get into one-level screw expander 23; One-level screw expander 23 inlets are provided with one-level inlet modulating valve 22; In order to regulate the flow of the steam that gets into one-level decompressor 23, steam gets into and becomes the discharge of medium temperature and medium pressure gas after the 23 expansion actings of one-level screw expander drive load or drive generator 100 generatings.Also comprise a level security valve 28 and a secondary safety valve 29 one by one, be separately positioned on the output terminal of said one-level screw expander and said secondary screw expander.When ducted vapor pressure superelevation, can pass through this safety valve pressure release.
For making full use of this part not by the residual heat resources of utilizing fully; This part medium temperature and medium pressure gas gets into interstage heat exchanger 245 and is heated by the high-temperature residual heat from industrial enterprise again; Improve superheat temperature; Get into secondary screw expander 27 through secondary suction valve 25 then; Secondary screw expander 27 inlet is provided with secondary inlet modulating valve 26, and in order to regulating the flow of the steam that gets into decompressor 27, steam gets into the secondary screw expander and expands and become low-temp low-pressure gas after the acting and discharge and drive another load or 200 generatings of another generator simultaneously.The regulating method such as the embodiment 1 of one-level inlet modulating valve described in the present embodiment and secondary inlet modulating valve are so repeat no more.
Interstage heat exchanger of the present invention also comprises a high temperature heat source inlet opening 241, connects the input high temperature heat source to the medium temperature and medium pressure steam heating in the tube side of this interstage heat exchanger.Described interstage heat exchanger also comprises an exhaust vent 242, through the pipeline combustion gas or get back in the pipe network and utilize.
The power recovery system of double expansion of the present invention installs simultaneously and is equipped with lubricating oil system, cooling water system and electric meter control system.Described lubricating oil system is the lubricant oil that sealing, bearing and the equalizing piston of two screw rods decompressor provides certain pressure; Described cooling water system is in order to cool off lubricant oil and sealing; Described electric meter control system is gathered, is monitored the system core parameter, guarantees the normal operation of unit.
The present invention promotes one-level screw expansion machine rotor through high-pressure and high-temperature steam and externally does work, and can drag load or generating driving generator.Medium temperature and medium pressure steam after the expansion is discharged from the one-level screw expander, and the steam that gets into after the inter-stage heat exchanger heats again gets into the secondary screw expander through secondary suction valve, secondary modulating valve.Warm steam promotes the rotor acting at compound expansion machine medium pressure steam in middle the pressure, can drag load or generating driving generator.The gas of the one-tenth low-temp low-pressure after the acting is discharged from the secondary screw expander, accomplishes the energy recovery process.Has advantage to heat recovery is more abundant, Btu utilization efficient is higher.
Claims (9)
1. power system of utilizing two-stage screw expander steam overbottom pressure; It is characterized in that; Comprise: through one-level suction valve, one-level inlet modulating valve, one-level screw expander, the inter-stage heat exchanger that pipeline is linked in sequence, secondary suction valve, secondary inlet modulating valve, secondary screw expander;
High temperature and high pressure steam gets into one-level suction valve, one-level modulating valve entering one-level screw expander through pipeline, drives a load or drives a generator for electricity generation; Get into interstage heat exchanger again from the medium temperature and medium pressure steam of one-level screw expander output,, drive another load or drive another generator for electricity generation through outputing to secondary suction valve, secondary modulating valve entering secondary screw expander after this interstage heat exchanger heating.
2. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 1; It is characterized in that; Also comprise a level security valve and a secondary safety valve one by one, be separately positioned on the output terminal of said one-level screw expander and said secondary screw expander.
3. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 1; It is characterized in that; The input end of described one-level inlet modulating valve also comprises a speed probe or power sensor; Rotating speed or power signal that described one-level inlet modulating valve is gathered the one-level screw expander through described speed probe or power sensor come the regulating and controlling valve opening, to regulate the flow of the steam that gets into this one-level screw expander.
4. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 1; It is characterized in that; The input end of described secondary inlet modulating valve also comprises a speed probe or power sensor; Rotating speed or power signal that described secondary inlet modulating valve is gathered the secondary screw expander through described speed probe or power sensor come the regulating and controlling valve opening, to regulate the flow of the steam that gets into this secondary screw expander.
5. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 1; It is characterized in that; Described interstage heat exchanger also comprises a high temperature heat source inlet opening, and the input high temperature heat source is to the medium temperature and medium pressure steam heating in the tube side of this interstage heat exchanger.
6. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 5 is characterized in that described interstage heat exchanger also comprises an exhaust vent, through the pipeline combustion gas.
7. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 1; It is characterized in that; Described interstage heat exchanger also comprises a high temperature and high pressure steam inlet opening, and the input high temperature and high pressure steam is to the medium temperature and medium pressure steam heating in the tube side of this interstage heat exchanger.
8. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 7 is characterized in that described interstage heat exchanger also comprises a high temperature and high pressure steam delivery outlet, is connected with said one-level suction valve through pipeline.
9. a kind of power system of utilizing two-stage screw expander steam overbottom pressure according to claim 1 is characterized in that, described system also comprises outfit lubricating oil system, cooling water system and electric meter control gear;
Described lubricating oil system provides the lubricant oil of certain pressure for sealing, bearing and the equalizing piston of each screw expander and helical-lobe compressor;
Described cooling water system is in order to cool off said lubricant oil and sealing;
Described electric meter control gear guarantees the normal operation of unit in order to related parameter collection is arranged, the monitoring of this system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101208775A CN102619567A (en) | 2012-04-24 | 2012-04-24 | Power system utilizing excessive steam pressure of two-stage screw expansion machine |
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| CN2012101208775A CN102619567A (en) | 2012-04-24 | 2012-04-24 | Power system utilizing excessive steam pressure of two-stage screw expansion machine |
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Cited By (3)
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| CN105840243A (en) * | 2016-05-19 | 2016-08-10 | 神华集团有限责任公司 | Steam power generation device and steam power generation system |
| CN106285785A (en) * | 2016-10-21 | 2017-01-04 | 西安琦通新能源设备有限公司 | The single machine two-stage dilating screw machine that pressure energy of natural gas recycles |
| CN107763891A (en) * | 2017-10-16 | 2018-03-06 | 清华大学 | A kind of air circulation compression net for air-source heat pump units |
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| CN102022221A (en) * | 2010-12-03 | 2011-04-20 | 北京工业大学 | Organic Rankine cycle diesel engine tail gas and waste heat utilization system using two-stage single-screw expanding machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105840243A (en) * | 2016-05-19 | 2016-08-10 | 神华集团有限责任公司 | Steam power generation device and steam power generation system |
| CN105840243B (en) * | 2016-05-19 | 2019-10-18 | 神华集团有限责任公司 | A kind of steam electric power generator and system |
| CN106285785A (en) * | 2016-10-21 | 2017-01-04 | 西安琦通新能源设备有限公司 | The single machine two-stage dilating screw machine that pressure energy of natural gas recycles |
| CN106285785B (en) * | 2016-10-21 | 2019-01-01 | 西安琦通新能源设备有限公司 | The single machine two-stage dilating screw machine that pressure energy of natural gas recycles |
| CN107763891A (en) * | 2017-10-16 | 2018-03-06 | 清华大学 | A kind of air circulation compression net for air-source heat pump units |
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Application publication date: 20120801 |