CN109751093A - A kind of back pressure type Inflow Steam Turbine electricity generation system - Google Patents
A kind of back pressure type Inflow Steam Turbine electricity generation system Download PDFInfo
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- CN109751093A CN109751093A CN201711061200.8A CN201711061200A CN109751093A CN 109751093 A CN109751093 A CN 109751093A CN 201711061200 A CN201711061200 A CN 201711061200A CN 109751093 A CN109751093 A CN 109751093A
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- 230000005611 electricity Effects 0.000 title claims abstract description 25
- 239000007921 spray Substances 0.000 claims abstract description 15
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- 230000001105 regulatory effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
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- 238000000034 method Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000006837 decompression Effects 0.000 description 4
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 4
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- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
The invention discloses a kind of back pressure type Inflow Steam Turbine electricity generation systems, including high pressure steam inlet pipeline, low pressure exhaust pipeline；Centripetal steam turbine is set on high pressure steam inlet pipeline to low pressure exhaust pipeline, and centripetal steam turbine is connect by reduction gearbox with generator.The system by required back pressure is conveyed to steam user after the high steam that inlet pipeline conveys is depressured and is generated electricity by centripetal steam turbine, to produce electricl energy in the case where not influencing user's vapour using high steam energy, good economic benefit is generated；Generated electric energy can be used for electricity consumption in factory, and the energy consumption equipments such as water pump, blower provide power for example in factory；Centripetal steam turbine has the characteristics that high-efficient, investment is low, is easy to operation and maintenance；It is provided with by-pass line, to be opened in steam turbine disorderly closedown, guarantees the just common vapour of user and protects steam turbine will not overspeed；Spray desuperheating device is had before low pressure exhaust pipeline, for temperature needed for gas turbine exhaust gas is cooled to user.
Description
Technical field
The invention belongs to the technical fields that energy conservation and energy recovery utilize.In particular it relates to a kind of back pressure type to
Heart turbine generating system.
Background technique
With the upgrading adjustment of the industrial structure of national economy and the needs of energy-saving and emission-reduction, substantial amounts in various enterprises, China
Industrial Boiler be urgently subject to transformation and upgrade.The political affairs for the control air pollution being increasingly stringenter have been worked out in particular with country
Plan, miscellaneous highly energy-consuming coal-burned industrial boiler have arrived the stage controlled.The universal capacity of these boilers is smaller, puts down
Equal about 11 tphs of evaporation capacity, actual operating efficiency only have 65% or so, and urgent need reduces coal consumption by technological transformation, controls
Pollution.
Specifically, a large amount of Industrial Boiler is widely distributed in the industries such as papermaking, printing and dyeing, weaving, chemical industry, petroleum, is
Production process provides steam.Need to carry out steam provided by boiler pressure and temperature reducing in many cases to meet downstream production
It is cooled down it is required that generally depressurizing and spraying water using pressure reducing valve.Since high steam is without acting process and directly from higher pressure
Power is down to lower pressure, and more high-grade energy is not utilized, and forms serious waste.
In the prior art, using the steam of Industrial Boiler generation after back pressure type or sucking condensing turbine power generation, then with
The back pressure that user needs downstream production process conveying steam is a kind of to significantly improve energy utilization rate and generate good economical
The cogeneration of heat and power mode of benefit.Current this kind of steam turbine is generally shaft flow structure, small-sized industrial boiler steam flow and
Within the scope of generated energy, due to axial-flow turbine need use structure similar with high-power type so that per kilowatt manufacture at
This is higher, takes up a large area, and intake and exhaust arrangement is generally double-layer structure, needs certain construction work amount.Simultaneously because axis stream
Formula turbine blade rotation speed is limited, and operational efficiency is lower when can not achieve high revolving speed, thus generating electricity for back pressure type, usually
Only 50% or so.
In conclusion that there are investment constructions is at high cost, fortune for the cogeneration of heat and power mode of steam back pressure type power generation in the prior art
The disadvantage that line efficiency is low and maintenance is complicated.This just needs to develop new back pressure type generation technology, builds to reduce steamer speculative investment
Be set as this, improve operational efficiency, generate good economy return, this by be all types of industries boiler energy-saving transformation and upgrade development and application
Trend.
Summary of the invention
The present invention provides a kind of back pressure type Inflow Steam Turbine electricity generation system, and the purpose is to improve back pressure steam electricity generation system
Energy utilization efficiency simultaneously reduces system investments.
To achieve the goals above, the technical scheme adopted by the invention is as follows:
Back pressure type Inflow Steam Turbine electricity generation system of the invention is installed between the boiler and steam user for generating steam, including
High pressure steam inlet pipeline, low pressure exhaust pipeline are installed in the high pressure steam inlet pipeline between low pressure exhaust pipeline
Centripetal steam turbine, the centripetal steam turbine are connect by reduction gearbox with generator.
Steam by-pass pipe valve, one end of the steam by-pass pipe valve and high steam is arranged in the centripetal steam turbine
The exhaust pipe of inlet pipeline connection, the other end and centripetal steam turbine converges.
Stop valve is set on the jet chimney between the high pressure steam inlet and centripetal steam turbine and main vapour is adjusted
Valve；Bypass duct regulating valve is set on the steam by-pass pipe valve.
Spray desuperheating device is had before the low pressure exhaust pipeline, the exhaust pipe and bypass with centripetal steam turbine
Pipeline connection.
The centripetal steam turbine includes steam turbine admission line, air inlet volute, steam turbine outlet conduit；It is described to
Core type steam turbine is equipped with nozzle ring and impeller；The nozzle ring be installed on the outside of impeller and with impeller axial direction position consistency；Institute
The air inlet volute stated along the circumferential direction is looped around on the outside of nozzle ring；The steam turbine admission line is connect with air inlet volute；Institute
The steam turbine outlet conduit and impeller stated are coaxial.
The impeller is provided with blade between steam turbine outlet conduit by outer rim；The blade is at impeller outer edge
Tangent line it is consistent with impeller radial direction；Bending direction of the blade at steam turbine outlet conduit and impeller direction of rotation
On the contrary.
The nozzle ring has nozzle vane；The width of the nozzle vane is kept not by nozzle ring outer rim to inner edge
Become；The nozzle vane from nozzle ring outer rim to inner edge from formed line it is consistent with impeller direction of rotation.
The steam user is steam drying device, steam heater, steam-type lithium bromide refrigerator, the life using steam
It is any one or any number of in producing line.
The present invention by adopting the above technical scheme, utilizes the pressure difference between steam needed for the steam of Industrial Boiler output and user
And the temperature difference, power is generated by centripetal steam turbine and generator is driven to produce electricl energy, due to using reduction gearbox and generator to connect
It connects, high revolving speed can be used in centripetal steam turbine, and operational efficiency is high, is conveyed to again after the high-grade thermal energy for making full use of steam
User significantly improves energy utilization rate, generates good economic well-being of workers and staff；Generated electric energy can supply for electrical equipments various in factory
The energy consumption equipments such as electricity, for example water pump, blower provide power；Centripetal steam turbine manufacturing cost is low, and occupied area is small, can modularization
Installation, substantially reduces construction work amount, and operation and maintenance are simple, expense is low；Equipped with by-pass line, there is event in generating set
It is opened when barrier or maintenance, does not influence the just common gas of backend user, also function to the effect for preventing Steam Turbine Over-speed Accident；In low pressure exhaust pipe
Spray desuperheating device is set before road, sprays water, will steam as needed when exhaust is superheated steam according to steam turbine operation state
Stripping temperature is down to the temperature of user's needs, guarantees the safety and stability supplied to user.
Detailed description of the invention
It accompanying drawing content and marked in the figure is briefly described as follows:
Fig. 1 is system composition schematic diagram of the invention；
Fig. 2 is the diagrammatic cross-section of centripetal steam turbine of the invention；
Fig. 3 is the impeller schematic diagram of centripetal steam turbine of the invention.
Specific embodiment
Below against attached drawing, by the description of the embodiment, making to a specific embodiment of the invention further details of
Illustrate, to help those skilled in the art to have more complete, accurate and deep reason to inventive concept of the invention, technical solution
Solution.
As shown in Fig. 1, the present invention is a kind of back pressure type Inflow Steam Turbine electricity generation system, is installed on the boiler for generating steam
Between steam user, which includes high pressure steam inlet pipeline (1), low pressure exhaust pipeline (11) and steam user.For reality
It now utilizes the differential pressure power generation between high steam and low pressure exhaust and realizes that the purpose of high-grade steam heat energy utilization, the present invention are adopted
The technical solution taken are as follows:
As shown in Fig. 1, back pressure type Inflow Steam Turbine electricity generation system of the invention, the high pressure steam inlet pipeline (1) extremely
Between low pressure exhaust pipeline (11) install centripetal steam turbine (4), the centripetal steam turbine (4) by reduction gearbox (5) with
Generator (6) connection.The revolving speed of centripetal steam turbine (4) is converted into driving by the reduction gearbox (5) by speed change gear
Revolving speed needed for generator (6) operation.
Steam by-pass pipe valve (9) are arranged in the centripetal steam turbine (4), one end of the steam by-pass pipe valve (9)
It is connected to high pressure steam inlet pipeline (1), the exhaust pipe (7) of the other end and centripetal steam turbine (4) converges.
Stop valve is set on jet chimney between the high pressure steam inlet pipeline (1) and centripetal steam turbine (4)
(2) with main steam control valve (3)；Bypass duct regulating valve (8) are set on the steam by-pass pipe valve (9).
Spray desuperheating device (10) are had before the low pressure exhaust pipeline (11), the row with centripetal steam turbine (4)
Feed channel (7) and by-pass line (9) connection.
As shown in Fig. 2, the centripetal steam turbine (4) include steam turbine admission line (12), air inlet volute (13),
Steam turbine outlet conduit (14)；The centripetal steam turbine (4) is equipped with nozzle ring (15) and impeller (16)；The nozzle ring
(15) it is installed on the outside of impeller (16) and consistent with impeller (16) axial position；The air inlet volute (13) along the circumferential direction ring
It is wound on the outside of nozzle ring (15)；The steam turbine admission line (12) is connect with air inlet volute (13)；The steam turbine goes out
Mouth pipeline (14) and impeller (16) are coaxial.
The steam turbine admission line (12) is connect with high pressure steam inlet pipeline (1)；The impeller (16) passes through
Shaft is connected with the input shaft of reduction gearbox (5)；The output shaft and generator (6) of the reduction gearbox (5) are coaxially connected.
The impeller (16) is by outer rim to being provided with blade (17) between steam turbine outlet conduit (14)；The blade
(17) tangent line at impeller (16) outer rim is consistent with impeller (16) radial direction；The blade (17) is from impeller (16) outer rim
Start at steam turbine outlet conduit (14), gradually to the back-flexing of direction of rotation；The blade (17) goes out in steam turbine
Bending direction at mouth pipeline (14) is opposite with impeller (16) direction of rotation.Blade bend mode in this way, so that steam
It is expanded and is accelerated in impeller, to push impeller to rotate with suitable flowing velocity and angle and do work.
The nozzle ring (15) has nozzle vane (18)；The width of the nozzle vane (18) is by nozzle ring (15)
Outer rim to inner edge remains unchanged；The nozzle vane (18) from nozzle ring (15) outer rim to inner edge from formed line and impeller
(16) direction of rotation is consistent.The width and installation direction of nozzle vane accelerate steam sufficiently when flowing through nozzle ring,
Impeller can be flowed into speed appropriate and angle and push impeller rotation acting.
The steam user is steam drying device, steam heater, steam-type lithium bromide refrigerator, uses steam
Any one or any number of or steam user in production line is other gas utilization units.By back pressure type Inflow Steam Turbine
After decompression cools down and generates electricity, the pressure of steam is identical as pressure required for steam user.According to Boiler Steam parameter and steamer
The operating condition of machine, when gas turbine exhaust gas be superheated steam, higher than steam user need temperature when, pass through spray desuperheating device
It sprays water to gas turbine exhaust gas, delivery temperature is down to user's required temperature.
The working principle of the invention is: flowing through centripetal steam turbine in high steam and is depressurized to gas turbine exhaust gas pressure
In the process, the difference of the enthalpy between high steam and low pressure exhaust is exactly the producible electric energy of steam of unit mass, such as following formula:
W=(Hin-Hout)*Cm
In formula:
Hin-high pressure steam inlet enthalpy；
Hout-low pressure exhaust enthalpy；
Cm-comprehensively considers the mechanical efficiency after reduction gearbox and generator loss, and general value is 0.9 ~ 0.93.
Enthalpy difference Hin-Hout in above formula can be calculate by the following formula again:
Hin-Hout=(Hin-Hout,is)*Ct
In formula:
Hout, is-high steam are decompressed to enthalpy when gas turbine exhaust gas pressure by isentropic procedure；
Ct-centripetal steam turbine internal efficiency, general value are 0.72 ~ 0.85.
The working principle of the invention is as shown in Fig. 1:
High steam is flowed by high pressure steam inlet pipeline (1), and stop valve (2) are provided at high pressure steam inlet pipeline (1),
Steam turbine inlet pipeline (12) are cut off when for shutdown or failure, steam is prevented to enter centripetal steam turbine (4)；In stop valve
(2) main steam control valve (3) are provided with after, for adjusting the steam flow size into centripetal steam turbine (4).
High steam flows through stop valve (2) and main steam control valve (3) and flows into air inlet by steam turbine admission line (12) afterwards
Spiral case (13), flow direction is changed into the eddy flow around nozzle ring (15) circumferencial direction in air inlet volute (13), then by nozzle ring
(15) outer rim flow nozzle ring (15).High steam is in the interior pressure reduction of nozzle ring (15) and realizes expansion, accelerates to certain
The guidance that nozzle vane (18) direction is pressed after flow velocity flows into impeller (16).Steam continues expansion in impeller (16) and accelerates, and borrows
It helps its flow velocity and pressure to push blade (17), makes impeller (16) rotation acting, when steam reaches at steam turbine outlet conduit (14)
When, it is down to pressure required by steam user substantially, is discharged through steam turbine outlet conduit (14).Impeller (16) is in higher rotation speed
Lower rotation after reducing revolving speed by reduction gearbox (5), drives generator (6) power generation, exports electric energy.
Steam after decompression enters spray desuperheating device (10) through gas turbine exhaust gas pipeline (7), according to provided by boiler
The variation of steam parameter and centripetal steam turbine (4) operating condition, if centripetal steam turbine (4) excessive discharge temperature, steam
Still it is superheat state, then by spraying into suitable quantity of water in spray desuperheating device (10), reduces steam using the vaporization heat absorption of water
Temperature reaches the requirement of steam user.
The back pressure type Inflow Steam Turbine electricity generation system is additionally provided with steam by-pass pipe valve (9), and steam can pass through bypass
Pipeline (9) bypasses centripetal steam turbine (4), is directly entered spray desuperheating device after the decompression of the pressure reducing valve (8) of bypass duct
(10).In this way when centripetal steam turbine electricity generation system breaks down, guarantee to supply steam user by opening bypass duct (9)
The requirement of vapour, and play the role of preventing centripetal steam turbine (4) from exceeding the speed limit.When this system needs maintenance down, can also pass through
Bypass duct (9) are opened to guarantee to the normal steam supply of steam user.
Case study on implementation one:
Centripetal steam turbine can drive electrical power generators by reduction gearbox, can also the energy consumption equipments such as Driving Fan, water pump.Radial inflow
Steam turbine can be directly connected to and drive dragged equipment, can also be converted into centripetal steam turbine revolving speed by speed change gear
Dragged equipment is driven after required revolving speed.
Case study on implementation two:
It needs to be dried using steam in certain printing and dyeing mill's production process, needs 20 tons of steam of consumption per hour.The there is provided steaming of boiler
The pressure of vapour is 2.35 MPa, and 400 DEG C of temperature, the saturated vapor that pressure is 0.6 MPa is actually needed in production process.Former user
Formula is by being fed directly to production line after pressure reducing valve decompression and spray cooling.Centripetal steam turbine power generation system is installed after transformation
System, pressure needed for being depressurized to production by centripetal steam turbine, is produced electricl energy using steam thermal energy in the process, in factory
Then equipment electricity consumption will be delivered to production line after steam cooling to saturation state by spray desuperheating device.
Generated energy calculates:
Steam turbine entrance steam enthalpy: 3242.6 kJ/kg；Gas turbine exhaust gas enthalpy: 2988.2 kJ/kg, delivery temperature:
265℃；
Every kilogram of gas turbine exhaust gas need to spray into the quality of water: 0.088 kg；
When practical gas consumption is 20 t/h, the steam flow of centripetal steam turbine: 18.4 t/h is flowed through
Centripetal steam turbine generated output: 1150 kW；Electricity consumption of the exported electric energy for energy consumption equipment in factory；It runs per year
It calculates within 7000 hours, the industrial electricity of 8,050,000 kilowatt hours can be saved every year, generate distinct economic.
The control system of centripetal steam turbine can change automatic control steam turbine according to steam flow and maintain stabilized (steady-state) speed,
The system can be integrated with the control and monitoring system of boiler, is not necessarily to staff on duty.Centripetal steam turbine structure is simple, can be steady in a long-term
Operation, maintenance workload are small.When turbine LP rotors failure needs to shut down, bypass duct is opened, and steam turbine is prevented
Hypervelocity.Bypass duct also can guarantee not to be influenced to convey steam to user in system-down maintenance.Pass through spray desuperheating device, energy
Enough guarantee that vapor (steam) temperature meets the needs of steam user.In conclusion centripetal steam turbine has cost of investment low, maintenance letter
Single, expense is low, and the high feature of operational efficiency can make full use of the high-grade thermal energy of high steam to produce electricl energy, and is in-plant equipment
Power supply, or the energy consumption equipments such as water pump, blower are directly driven, therefore significant economic benefit can be generated using the present invention.
The present invention is exemplarily described in conjunction with attached drawing above, it is clear that specific implementation of the invention is not by above-mentioned side
The limitation of formula, as long as using the improvement for the various unsubstantialities that conception and technical scheme of the invention carry out, or not improved
It is within the scope of the present invention the conception and technical scheme of the invention are directly applied to other occasions.
Claims (7)
1. a kind of back pressure type Inflow Steam Turbine electricity generation system is installed between the boiler and steam user for generating steam, including height
Press steam inlet (1), low pressure exhaust pipeline (11), it is characterised in that: extremely low in the high pressure steam inlet pipeline (1)
Centripetal steam turbine (4) are installed between pressure feed channel (11), the centripetal steam turbine (4) passes through reduction gearbox (5) and hair
Motor (6) connection.
2. back pressure type Inflow Steam Turbine electricity generation system according to claim 1, it is characterised in that: the radial inflow steamer
Steam by-pass pipe valve (9) are arranged in machine (4), and one end and high pressure steam inlet pipeline (1) of the steam by-pass pipe valve (9) are even
Logical, the exhaust pipe (7) of the other end and centripetal steam turbine (4) converges.
3. back pressure type Inflow Steam Turbine electricity generation system according to claim 2, it is characterised in that: the high steam into
Setting stop valve (2) and main steam control valve (3) on jet chimney between mouth pipeline (1) and centripetal steam turbine (4)；Described
Bypass duct regulating valve (8) are set on steam by-pass pipe valve (9).
4. back pressure type Inflow Steam Turbine electricity generation system according to claim 1, it is characterised in that: the low pressure exhaust pipe
Spray desuperheating device (10) are had before road (11), are connected with the exhaust pipe (7) and by-pass line (9) of centripetal steam turbine (4)
It connects.
5. back pressure type Inflow Steam Turbine electricity generation system according to claim 1, it is characterised in that: the radial inflow steamer
Machine (4) includes steam turbine admission line (12), air inlet volute (13), steam turbine outlet conduit (14)；The radial inflow steamer
Machine (4) is equipped with nozzle ring (15) and impeller (16)；The nozzle ring (15) be installed on the outside of impeller (16) and with impeller (16)
Axial position is consistent；The air inlet volute (13) is along the circumferential direction looped around on the outside of nozzle ring (15)；The steam turbine into
Feed channel (12) is connect with air inlet volute (13)；The steam turbine outlet conduit (14) and impeller (16) is coaxial.
6. back pressure type Inflow Steam Turbine electricity generation system according to claim 5, it is characterised in that: the impeller (16) by
Outer rim is to being provided with blade (17) between steam turbine outlet conduit (14)；The blade (17) cutting at impeller (16) outer rim
Line is consistent with impeller (16) radial direction；Bending direction and impeller of the blade (17) at steam turbine outlet conduit (14)
(16) direction of rotation is opposite.
7. back pressure type Inflow Steam Turbine electricity generation system according to claim 5, it is characterised in that: the nozzle ring (15)
With nozzle vane (18)；The width of the nozzle vane (18) is remained unchanged by nozzle ring (15) outer rim to inner edge；It is described
Nozzle vane (18) from nozzle ring (15) outer rim to inner edge from formed line it is consistent with impeller (16) direction of rotation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711061200.8A CN109751093A (en) | 2017-11-02 | 2017-11-02 | A kind of back pressure type Inflow Steam Turbine electricity generation system |
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| CN201711061200.8A CN109751093A (en) | 2017-11-02 | 2017-11-02 | A kind of back pressure type Inflow Steam Turbine electricity generation system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410574A (en) * | 2013-07-31 | 2013-11-27 | 北京硕人海泰能源环境技术有限公司 | Natural gas differential pressure power generation and cooling capacity recycling system and power generation and cooling capacity recycling method utilizing the same |
| CN104481620A (en) * | 2014-11-27 | 2015-04-01 | 华中科技大学 | Organic working medium radial inflow turbine power generation device |
| CN104696026A (en) * | 2015-02-12 | 2015-06-10 | 张德志 | Small and medium-sized, energy-saving and efficient intermediate reheating steam turbine set |
| CN105156157A (en) * | 2015-08-19 | 2015-12-16 | 安徽新宁能源科技有限公司 | Steam pressure reduction power generation device |
| CN105888740A (en) * | 2016-01-27 | 2016-08-24 | 华电漯河发电有限公司 | Backpressure turbine and motor single-shaft combined drive connection structure |
| CN207761714U (en) * | 2017-11-02 | 2018-08-24 | 永能动力（北京）科技有限公司 | A kind of back pressure type Inflow Steam Turbine power generator |
-
2017
- 2017-11-02 CN CN201711061200.8A patent/CN109751093A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410574A (en) * | 2013-07-31 | 2013-11-27 | 北京硕人海泰能源环境技术有限公司 | Natural gas differential pressure power generation and cooling capacity recycling system and power generation and cooling capacity recycling method utilizing the same |
| CN104481620A (en) * | 2014-11-27 | 2015-04-01 | 华中科技大学 | Organic working medium radial inflow turbine power generation device |
| CN104696026A (en) * | 2015-02-12 | 2015-06-10 | 张德志 | Small and medium-sized, energy-saving and efficient intermediate reheating steam turbine set |
| CN105156157A (en) * | 2015-08-19 | 2015-12-16 | 安徽新宁能源科技有限公司 | Steam pressure reduction power generation device |
| CN105888740A (en) * | 2016-01-27 | 2016-08-24 | 华电漯河发电有限公司 | Backpressure turbine and motor single-shaft combined drive connection structure |
| CN207761714U (en) * | 2017-11-02 | 2018-08-24 | 永能动力（北京）科技有限公司 | A kind of back pressure type Inflow Steam Turbine power generator |
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