CN212454554U - High-efficient nimble vapour electricity hybrid power equipment - Google Patents
High-efficient nimble vapour electricity hybrid power equipment Download PDFInfo
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- CN212454554U CN212454554U CN202020507256.2U CN202020507256U CN212454554U CN 212454554 U CN212454554 U CN 212454554U CN 202020507256 U CN202020507256 U CN 202020507256U CN 212454554 U CN212454554 U CN 212454554U
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- 230000008901 benefit Effects 0.000 abstract description 9
- 238000004134 energy conservation Methods 0.000 abstract description 5
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Abstract
The utility model discloses a high-efficient nimble vapour electric hybrid equipment, include: the system comprises a steam turbine, a gear box, an asynchronous motor, a vacuum circuit breaker and an output device; the gear box is a gear box with a clutch function; the asynchronous motor is a double-shaft extension asynchronous motor; the output shaft of the steam turbine is connected with the input shaft of the gear box; the output shaft of the gear box is connected with one end of the asynchronous motor rotor, and the other end of the asynchronous motor rotor is connected with the input end of the output device; the power end of the asynchronous motor is connected with the vacuum circuit breaker and is connected with a power bus through the vacuum circuit breaker; the steam-electric hybrid power system can be flexibly switched among three operation modes of electric operation, steam operation and steam-electric hybrid operation, meets the operation requirements of energy conservation, electricity conservation and flexibility, has higher unit operation reliability than the conventional pure electric operation and pure steam operation, is matched with the steam gradient utilization of a steel mill, reduces the emission, can further improve the running rationality and economy, greatly increases the economic benefit of the steel mill, and has greater social benefit.
Description
Technical Field
The utility model relates to a steel mill power drive equipment technical field, more specifically the saying so relates to a high-efficient nimble vapour electricity hybrid power equipment.
Background
At present, with the rising of the energy conservation and emission reduction and the green manufacturing call in China, a series of mature and emerging energy conservation and emission reduction technologies are utilized in steel enterprises in succession. Among them, many waste heat recycling technologies are favored because of the advantages of low investment, high benefit, low emission, etc.
However, the current waste heat recycling approach in the steel industry is single, mainly by recycling waste heat to produce steam for process heating and drying, and the redundant part is merged into a steam pipe network or generates electricity on site. With the progress of energy-saving technology of enterprises and the deepening of waste heat recovery work, the surplus of steam is larger and larger. Although partial steam can be digested in power generation, the surplus of steam (especially in southern areas and summer) is a problem to be solved urgently under the influence of investment of power generation equipment, management cost, operation of a power grid and the like. With the development of control and manufacturing technologies, enterprises are beginning to study the utilization mode of driving large-scale equipment by using steam as power.
In addition, the market conditions are constantly changed, the coal burning cost and the electricity consumption cost are main judgment bases for selecting a proper driving mode by a steel mill, but the high and low discharge of the coal burning cost and the electricity consumption cost is not constant, so that the disorder of changing electricity into steam and changing steam into electricity of the steel mill in recent years is caused.
Therefore, how to provide a hybrid power device capable of switching power sources is a problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses solve one of the above-mentioned technical problem among the prior art to a certain extent at least.
In view of the above, the present invention aims to provide a high-efficiency flexible steam-electric hybrid power device; the steam-electric hybrid power system can be flexibly switched among three operation modes of electric operation, steam operation and steam-electric hybrid operation, meets the operation requirements of energy conservation, electricity conservation and flexibility, has higher unit operation reliability than the conventional pure electric operation and pure steam operation, is matched with the steam gradient utilization of a steel mill, reduces the emission, can further improve the running rationality and economy, greatly increases the economic benefit of the steel mill, and has greater social benefit.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an efficient flexible steam-electric hybrid power plant comprising: the system comprises a steam turbine, a gear box, an asynchronous motor, a vacuum circuit breaker and an output device;
the gear box is a gear box with a clutch function;
the asynchronous motor is a double-shaft extension asynchronous motor;
the output shaft of the steam turbine is connected with the input shaft of the gear box; an output shaft of the gear box is connected with one end of the asynchronous motor rotor, and the other end of the asynchronous motor rotor is connected with an input end of the output device; and the power end of the asynchronous motor is connected with the vacuum circuit breaker and is connected with a power bus through the vacuum circuit breaker.
According to the technical scheme, compared with the prior art, the utility model discloses a high-efficient flexible steam-electricity hybrid power device, can switch over under electronic, the steam-driven mode of operation in a flexible way, when the cost is lower than the power consumption with the coal, the equipment uses the steam turbine as the main drive operation, asynchronous machine drive is as the assistance; when the electricity consumption is lower than the coal consumption cost, the unit operates by taking the asynchronous motor as a main drive, and a proper drive mode can be selected according to the actual situation so as to adapt to the market change and save the operation cost.
Preferably, in the above efficient and flexible steam-electric hybrid power plant, the output shaft of the steam turbine is connected to the input shaft of the gear box, the output shaft of the gear box is connected to one end of the asynchronous motor rotor, and the other end of the asynchronous motor rotor is connected to the input end of the output device through couplings; this scheme is an advantageous scheme for realizing the connection of the devices.
Preferably, in the above-mentioned high-efficient nimble vapour-electricity hybrid power equipment, the steam turbine is the back pressure steam turbine, and this scheme can realize steam cascade utilization, and the steam admission volume of back pressure steam turbine is adjusted according to the steam volume developments of demand under the operating mode, guarantees that the production technology demand is satisfied in the steam extraction or steam extraction, and shafting power is not enough or the excess is by asynchronous machine automatic matching.
Preferably, in the above efficient and flexible steam-electric hybrid power plant, the steam turbine is a straight condensing steam turbine; this solution is another preferred embodiment for implementing the present invention.
Preferably, in the above efficient and flexible steam-electric hybrid power plant, the output device is any one of a blast furnace blower, an air compressor, a dust removal blower or an RH vacuum pump; the scheme can be adapted to various power conversion devices, fully utilizes the steam energy of a steel mill, and reduces waste; realize diversified combination, the practicality is stronger.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
Wherein
The system comprises a steam turbine 1, a gear box 2, an asynchronous motor 3, an output device 4, a vacuum circuit breaker 5 and a power bus 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, and the specific meaning of the terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the present invention provides a high-efficiency flexible steam-electric hybrid power apparatus, which includes:
the system comprises a steam turbine 1, a gear box 2, an asynchronous motor 3, a vacuum circuit breaker 5, a power bus 6 and an output device 4;
the gear box 2 is a gear box 2 with a clutch function;
the asynchronous motor 3 is a double-shaft extension asynchronous motor 3;
an output shaft of the steam turbine 1 is connected with an input shaft of the gear box 2; the output shaft of the gear box 2 is connected with one end of the rotor of the asynchronous motor 3, and the other end of the rotor of the asynchronous motor 3 is connected with the input end of the output device 4; the power end of the asynchronous motor 3 is connected with a vacuum breaker 5 and is connected with a power bus 6 through the vacuum breaker 5.
In some optional embodiments of the utility model, the output shaft of steam turbine 1 and the input shaft of gear box 2, the output shaft of gear box 2 and the one end of the 3 rotors of asynchronous machine, the other end of the 3 rotors of asynchronous machine all pass through the coupling joint with output device 4's input.
In some optional embodiments of the present invention, the steam turbine 1 is a back pressure steam turbine.
In some optional embodiments of the present invention, the steam turbine 1 is a straight condensing steam turbine.
In some optional embodiments of the present invention, the output device 4 is any one of a blast furnace blower, an air compressor, a dust removing blower or an RH vacuum pump.
Specifically, when the output device 4 is a blast furnace blower, the specific implementation conditions of the utility model are as follows:
when the coal consumption is lower than the electricity consumption cost, the equipment operates by taking the steam turbine 1 as a main drive, and the asynchronous motor 3 drives as an auxiliary drive: when the equipment is started, the vacuum circuit breaker 5 is switched on, the asynchronous motor 3 is powered off from the power bus 6 to drag the blast furnace blower to a rated rotating speed, at the moment, the steam turbine 1 is not started and is disconnected through a clutch in the gear box 2, the steam turbine 1 is decoupled with other equipment, and the blast furnace blower is equivalent to a conventional electric drive mode; when the steam turbine 1 has a starting condition, warming-up and impulse rotation are completed, and the rotating speed of a rotor of the steam turbine 1 is more than or equal to the rotating speed of the asynchronous motor 3, a clutch in the gear box 2 is engaged, the steam turbine 1 is connected into a shafting on line to participate in driving, the valve adjusting of the large steam turbine 1 is gradually increased, the driving force of the steam turbine 1 is gradually increased, the rotating speed of the shafting is stably increased, the asynchronous motor 3 is driven to approach the synchronous rotating speed, the output of the asynchronous motor 3 is gradually reduced, the electric quantity from the power bus 6 is also gradually reduced, when the rotating speed of the shafting is increased to the synchronous rotating speed, the output of the asynchronous motor 3 is zero, the power is not powered from the power bus 6, the valve adjusting of the steam turbine 1 is continuously opened, the steam turbine 1 drives the rotating speed shafting to continuously increase, the synchronous rotating speed of the, the feed amount of the asynchronous motor 3 is continuously increased, the regulating valve of the steam turbine 1 is opened to the maximum and is not regulated after being stabilized, so that the high-efficiency operation of the steam turbine 1 at a design point is ensured, and the starting process of the unit is ended;
when the output requirement of the blast furnace blower is greater than the output requirement of the steam turbine 1, the asynchronous motor 3 operates at a lower synchronous speed and is in an electric working condition, and power is supplied from the power bus 6;
the stopping process is opposite to the starting process, the small steam turbine 1 is gradually opened to adjust the valve until the small steam turbine 1 is closed, the steam turbine 1 is decoupled through a clutch in the gear box 2, and then the electric drive output device is stopped in a conventional electric drive mode; during normal operation, when the steam turbine 1 trips due to faults, the clutch in the gear box 2 is automatically disengaged, the operation is converted into pure electric drive operation, and the operation mode refers to conventional electric drive; when the asynchronous motor 3 breaks down and does not influence the rotation of the motor rotor, the vacuum circuit breaker 5 is switched off and is converted into pure steam-driven operation, and the unit operation mode refers to the conventional steam-driven operation.
The electricity consumption is lower than the coal consumption cost, and the asynchronous motor 3 is used as a main drive to operate: if no surplus steam exists in a steel mill, the asynchronous motor 3 is independently driven to operate, and the steam turbine 1 is completely disconnected through the gear box 2. If the steel mill has surplus steam, the steam turbine 1 is driven as an auxiliary and is combined with the asynchronous motor 3 to drive the blast furnace blower, so that the output of the asynchronous motor 3 is reduced, and the consumption of electric quantity is reduced;
when a unit is started, a vacuum circuit breaker 5 is switched on, an asynchronous motor 3 is powered off from a power bus 6 to drag a blast furnace blower to a rated rotating speed, at the moment, a steam turbine 1 is not started and is disconnected through a clutch in a gear box 2, the steam turbine 1 is decoupled with the unit, the unit is equivalent to a conventional electrically-driven blast furnace blower, when surplus steam in a factory is stable, starting conditions of the steam turbine 1 are met, warming and impulse rotation are completed, when the rotating speed of a rotor of the steam turbine 1 is greater than or equal to the rotating speed of the asynchronous motor 3, the clutch in the gear box 1 is connected, the steam turbine 1 is connected into a shafting on line to participate in unit output, a regulating valve of the steam turbine 1 is gradually opened to the maximum, the steam turbine 1 is not regulated after being; because the surplus steam quantity in the plant is limited, the output of the steam turbine 1 generally cannot completely meet the output requirement of a blast furnace blower, and the output of the steam turbine can only be reduced but cannot be replaced by reducing the power consumption of the asynchronous motor 3, so that a unit shafting always runs at a synchronous rotating speed lower than that of the asynchronous motor; when the unit normally operates, the output of the steam turbine 1 is relatively stable, the output of the blast furnace blower continuously changes along with different working conditions, and the power balance of the shaft system is fully automatically matched by the asynchronous motor 3;
the stopping process is opposite to the starting process, the valve of the steam turbine 1 is gradually adjusted until the valve is closed, the steam turbine 1 is decoupled with the unit through a clutch in the gear box 2, and then the steam turbine is stopped in a conventional electric drive output device mode. When the steam turbine 1 is in fault trip during normal operation, the clutch in the gear box 2 is automatically disengaged, the operation is changed into the operation of a pure electric output device, and the operation mode refers to a conventional electric output mode; when the asynchronous motor 3 has a fault and the rotation of the motor rotor is not influenced, the vacuum circuit breaker 5 is switched off and is converted into a pure steam-driven output mode, and the operation mode refers to a conventional steam-driven output device.
The steam gradient utilization is realized, and the steam generated in the production process of a steel mill is exhausted or extracted by a back pressure steam turbine to realize the gradient utilization of energy; the processing modes of starting, running, stopping and failure modes refer to the two modes, and the difference is that the regulating valve of the back pressure turbine is not opened to the maximum and is kept unchanged, but the steam inlet quantity of the back pressure turbine is dynamically regulated according to the steam quantity required under the current working condition, the steam exhaust or extraction is ensured to meet the requirement of the production process, and the shafting power is insufficient or exceeds the part to be automatically matched by the asynchronous motor 3.
The utility model has the advantages that: the operation flexibility is high, multiple operation modes are provided, the operation modes can be freely switched among an electric operation mode, a steam operation mode and a steam-electric hybrid operation mode, and the operation cost is saved;
the operation reliability is high, the steam turbine and the asynchronous motor are mutually standby, and the operation reliability of the output device is improved by times;
the steam extraction and the steam exhaust of the steam turbine are not influenced by the working condition of an output device, the steam inlet quantity can be adjusted according to the process steam demand of a steel mill, the adjustment of the equipment load is fully automatically matched by an asynchronous motor, and the thermoelectric decoupling is realized;
the economic benefit of the equipment is less influenced by coal burning and electric power markets, and different operation modes can be flexibly adopted under different market forms, so that the operation cost of a steel mill is reduced;
by matching with the application of a back pressure type/straight condensing type steam turbine, the cascade utilization of the steam in the steel mill is realized, the emission is reduced, the economic benefit of the steel mill is further improved, and the electricity and energy conservation are realized.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. An efficient and flexible steam-electric hybrid power device, characterized by comprising: the device comprises a steam turbine (1), a gear box (2), an asynchronous motor (3), a vacuum circuit breaker (5) and an output device (4);
the gear box (2) is a gear box (2) with a clutch function;
the asynchronous motor (3) is a double-shaft extension asynchronous motor (3);
the output shaft of the steam turbine (1) is connected with the input shaft of the gear box (2); an output shaft of the gear box (2) is connected with one end of a rotor of the asynchronous motor (3), and the other end of the rotor of the asynchronous motor (3) is connected with an input end of the output device (4); and the power end of the asynchronous motor (3) is connected with the vacuum circuit breaker (5) and is connected with a power bus (6) through the vacuum circuit breaker (5).
2. A high-efficiency flexible steam-electric hybrid power plant as claimed in claim 1, characterized in that the output shaft of the steam turbine (1) and the input shaft of the gear box (2), the output shaft of the gear box (2) and one end of the rotor of the asynchronous motor (3), and the other end of the rotor of the asynchronous motor (3) and the input end of the output device (4) are all connected by couplings.
3. A high efficiency flexible steam electric hybrid plant according to claim 2, characterized in that the steam turbine (1) is a back pressure turbine.
4. A highly efficient and flexible steam-electric hybrid plant as claimed in claim 2, characterized in that said steam turbine (1) is a straight condensing turbine.
5. The efficient and flexible steam-electric hybrid power plant as claimed in claim 1, wherein the output device (4) is any one of a blast furnace blower, an air compressor, a dust removal blower or an RH vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020507256.2U CN212454554U (en) | 2020-04-09 | 2020-04-09 | High-efficient nimble vapour electricity hybrid power equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020507256.2U CN212454554U (en) | 2020-04-09 | 2020-04-09 | High-efficient nimble vapour electricity hybrid power equipment |
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| CN212454554U true CN212454554U (en) | 2021-02-02 |
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| CN202020507256.2U Expired - Fee Related CN212454554U (en) | 2020-04-09 | 2020-04-09 | High-efficient nimble vapour electricity hybrid power equipment |
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- 2020-04-09 CN CN202020507256.2U patent/CN212454554U/en not_active Expired - Fee Related
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Granted publication date: 20210202 |