CN114718682B - Sintering steam dragging system and method - Google Patents
Sintering steam dragging system and method Download PDFInfo
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- CN114718682B CN114718682B CN202210384767.3A CN202210384767A CN114718682B CN 114718682 B CN114718682 B CN 114718682B CN 202210384767 A CN202210384767 A CN 202210384767A CN 114718682 B CN114718682 B CN 114718682B
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- 238000005245 sintering Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000002918 waste heat Substances 0.000 claims abstract description 61
- 230000001360 synchronised effect Effects 0.000 claims abstract description 44
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 230000007812 deficiency Effects 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 7
- 244000309464 bull Species 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000007740 vapor deposition Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000007858 starting material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/14—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours using industrial or other waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/12—Combinations with mechanical gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a sintering steam dragging system and a sintering steam dragging method, comprising a waste heat steam boiler and a plurality of main exhaust fan structures, wherein the main shaft fan structure comprises a steam turbine, a variable speed clutch, a synchronous motor and a sintering main shaft fan which are sequentially connected, the steam turbine is connected with the main shaft fan through the variable speed clutch, and the combination and the separation of the steam turbine and the main exhaust fan are realized by adopting an overrunning clutch technology; the steam turbine of each main shaft fan structure is communicated with a waste heat steam boiler through a waste heat main steam pipeline; the steam turbine directly drives the fan to reduce the secondary conversion of energy after waste heat power generation, and simultaneously, a coaxial motor is used as a compensation machine and a starter, and the part with insufficient energy of waste heat steam is used as a compensation and standby motor; the steam distribution of the double-main exhaust fan system is reasonably controlled, so that the energy of main steam can be better utilized, and the energy consumption is further reduced.
Description
Technical Field
The invention belongs to the technical field of waste heat power generation, and particularly relates to a sintering steam dragging system and a sintering steam dragging method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The sintering engineering is the link with the highest energy consumption in modern steel production, and mainly consumes sintered fuel coal and a large amount of electric energy. The sintering main exhaust fan is the electric equipment with the largest electric energy consumption in the whole sintering production, and the traditional fan dragging mode is that a motor is directly dragged. Along with the increasingly strict energy-saving production requirements of sintering machines, the utilization coefficient of the sintering machines is also increased, and thicker material layers require the power of main exhaust fans of the sintering machines to be increased. After traditional sintering waste heat utilization mode is sintering waste heat electricity generation, electric energy is incorporated into the power grid in the mill, and the sintering fan gets electricity from the power grid again to drive the fan to work, and this kind of mode energy consumption is big, causes more wasting of resources, therefore, how to improve the setting through the sintering fan to the energy of better utilization main steam, further reduce the energy consumption is the technical problem that needs to solve.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme:
in a first aspect, the invention provides a sintering steam dragging system, which comprises a waste heat steam boiler and a plurality of main exhaust fan structures, wherein the main shaft fan structure comprises a steam turbine, a variable speed clutch, a synchronous motor and a sintering main shaft fan which are sequentially connected, the steam turbine is connected with the main shaft fan through the variable speed clutch, and the combination and the separation of the steam turbine and the main exhaust fan are realized by adopting an overrunning clutch technology; the steam turbine of each main shaft fan structure is communicated with the waste heat steam boiler through a waste heat main steam pipeline.
Further, the plurality of main exhaust fan structures comprise a first steam dragging main shaft fan and a second steam dragging main shaft fan, a steam turbine of the first steam dragging main shaft fan is communicated with a waste heat main steam pipeline, a steam turbine of the second steam dragging main shaft fan is also communicated with the waste heat main steam pipeline, and one end of the waste heat main steam pipeline is communicated with a waste heat steam boiler; the steam turbine comprises a waste heat steam source, a steam turbine high-pressure cylinder and a surface type heat exchanger, wherein the waste heat steam source is divided into two paths, one path of main steam a is connected with the steam turbine high-pressure cylinder, and the other path of main steam b is connected with the surface type heat exchanger. The steam turbine also comprises a steam turbine low pressure cylinder and a generator, the steam turbine high pressure cylinder and the steam turbine low pressure cylinder are connected with the generator, and the steam exhaust position of the steam turbine high pressure cylinder is connected with the surface type heat exchanger through a pipeline.
As one implementation mode, the speed change clutch comprises a connecting shaft and a bearing I, wherein the end part of the connecting shaft is connected with the bearing I, the other side of the bearing I is connected with one side of a clutch main body, the other end of the clutch main body is connected with a bearing III, the other side of the bearing III is connected with a pinion, and the pinion is connected with a large gear through a bearing IV; the lower part of the outer side of the pinion is provided with a bearing II, the upper part of the outer side of the bull gear is provided with a bearing V, and the lower part of the outer side of the bull gear is provided with a bearing IV; when the low-speed shaft rotating speed of the variable-speed clutch is equal to the rotating speed of the sintering main fan, the variable-speed clutch enables the turbine to be connected with the fan, and therefore the main exhaust fan is driven by the turbine.
As one embodiment, the synchronous motor comprises a motor housing, a rotating shaft, a bearing, at least one synchronous motor unit and at least one asynchronous motor unit; the synchronous motor unit comprises a synchronous stator and a synchronous rotor provided with permanent magnets, and the asynchronous motor unit comprises an asynchronous stator and an asynchronous rotor provided with conducting bars; the synchronous stator and the asynchronous stator are provided on an inner surface of the motor casing. The synchronous rotor and the asynchronous rotor are coaxially and concentrically arranged on the rotating shaft at intervals, the rotating shaft is arranged in the shell of the motor shell through the bearing, so that the synchronous rotor on the rotating shaft is aligned with the synchronous stator, and the asynchronous rotor is aligned with the asynchronous stator.
In a second aspect, the present invention also provides a working method of the sintering steam dragging system according to the first aspect, comprising:
the high-temperature steam generated by the waste heat steam boiler is conveyed to the steam turbine through a waste heat main steam pipeline and drives the steam turbine;
after the turbine drives the variable speed clutch to reduce speed, when the rotating speed of the low speed shaft of the variable speed clutch is equal to the rotating speed of the sintering main fan, the variable speed clutch enables the turbine to be connected with the fan, so that the turbine drives the main exhaust fan;
the synchronous motor is subjected to excitation system adjustment, so that the output power is gradually reduced, and the energy saving purpose is achieved; at this time, the energy required by the main exhaust fan mainly comes from the steam turbine, and the deficiency is compensated by the synchronous motor.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention now considers that the steam generated by the waste heat of the annular cooler is used for driving the steam turbine to directly drag the main fan; the steam turbine directly drives the fan to reduce the secondary conversion of energy after waste heat power generation, and simultaneously, a coaxial motor is used as a compensation machine and a starter, and the part with insufficient energy of waste heat steam is used as a compensation and standby motor; the steam distribution of the double-main exhaust fan system is reasonably controlled, so that the energy of main steam can be better utilized, and the energy consumption is further reduced.
2. When the rotating speed of the low-speed shaft of the variable-speed clutch is equal to the rotating speed of the sintering main fan, the variable-speed clutch enables the steam turbine to be connected with the fan, so that the main exhaust fan is driven by the steam turbine, the synchronous motor is regulated by the excitation system, the output power is gradually reduced, and the energy saving purpose is achieved; at the moment, the energy required by the main exhaust fan mainly comes from the steam turbine, the deficiency is compensated by the motor, the high-efficiency operation of the whole system is ensured, and the technical problem of how to reasonably control the steam distribution of the double main exhaust fan system to further reduce the energy consumption is solved.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a sintered vapor deposition system according to the present invention;
FIG. 2 is a schematic diagram of a main blower structure of the present invention;
FIG. 3 is a graph of the characteristics of the steam turbine of the present invention;
FIG. 4 is a schematic structural view of the transmission clutch of the present invention;
wherein: 1. a coupling shaft; 2. a bearing I; 3. a clutch body; 4. a bearing II; 5. a bearing III; 6. a pinion gear; 7. a large gear; 8. a bearing IV; 9. a bearing V; 10. a waste heat main steam pipeline; 11. a steam turbine; 12. a variable speed clutch; 13. a synchronous motor; 14. sintering main shaft fan.
The specific embodiment is as follows:
the invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiment one:
the embodiment provides a sintering steam dragging system, comprising: the main shaft fan structure comprises a steam turbine, a variable speed clutch, a synchronous motor and a sintering main shaft fan which are sequentially connected, wherein the steam turbine is connected with the main shaft fan through the variable speed clutch, and the combination and the separation of the steam turbine and the main exhaust fan are realized by adopting an overrunning clutch technology; the steam turbine of each main shaft fan structure is communicated with a waste heat steam boiler through a waste heat main steam pipeline;
when the rotating speed of the low-speed shaft of the variable-speed clutch is equal to that of the sintering main fan, the variable-speed clutch enables the steam turbine to be connected with the fan, so that the main exhaust fan is driven by the steam turbine, the synchronous motor is regulated by the excitation system, the output power is gradually reduced, and the energy saving purpose is achieved; the energy required by the main exhaust fan is mainly from the steam turbine, and the deficiency is compensated by the motor.
As an implementation mode, the multiple main exhaust fan structures comprise a first steam dragging main shaft fan and a second steam dragging main shaft fan, a steam turbine of the first steam dragging main shaft fan is communicated with a waste heat main steam pipeline, a steam turbine of the second steam dragging main shaft fan is also communicated with the waste heat main steam pipeline, and one end of the waste heat main steam pipeline is communicated with a waste heat steam boiler.
As one implementation mode, the steam turbine comprises a waste heat steam source, a steam turbine high-pressure cylinder, a steam turbine low-pressure cylinder, a surface heat exchanger, a generator and a condenser or a steam exhaust device, wherein the steam turbine high-pressure cylinder and the steam turbine low-pressure cylinder are connected with the generator, the waste heat steam source is provided by a waste heat steam boiler through a waste heat main steam pipeline, the waste heat steam source is divided into two paths, one path of main steam a is connected with the steam turbine high-pressure cylinder, the other path of main steam b is connected with the surface heat exchanger, the steam exhaust position of the steam turbine high-pressure cylinder is connected with the surface heat exchanger through a pipeline, the steam exhaust c of the steam turbine high-pressure cylinder is in heat exchange with the main steam b in the surface heat exchanger, the steam exhaust outlet of the surface heat exchanger is connected with the steam turbine low-pressure cylinder through a pipeline, and the steam exhaust outlet of the steam turbine low-pressure cylinder is connected with a condenser or a steam exhaust device through a pipeline, and the water outlet of the surface heat exchanger is connected with a hot well water tank of the condenser or the steam exhaust device through a hydrophobic pipeline.
As an implementation mode, according to the characteristic curves of the turbines, the air inflow of the two turbines is flexibly switched, so that the sintering turbine dragger unit can operate efficiently, and the waste heat of the sintering circular cooler can be utilized efficiently.
The sintering steam dragging system is of a double-flue and double-main exhaust fan structure; the waste heat boiler of the annular cooler drives two sets of steam-driven main exhaust fans; the distribution proportion of steam needs to be reasonably controlled; the steam turbine and the motor are operated under the optimal working condition, so that the waste heat utilization efficiency is improved, and the production energy consumption is reduced.
After the sintering circular cooler waste heat utilization system operates, sintering is carried out stably, a first-stage hot flue gas of the circular cooler enters a waste heat steam boiler to generate high-temperature steam to drive a turbine, after a speed change clutch is driven to reduce speed, when the rotating speed of a low-speed shaft of the speed change clutch is equal to that of a sintering main fan, the speed change clutch enables the turbine to be connected with the fan, so that the waste heat turbine drives the main exhaust fan, the synchronous motor is regulated through an excitation system, the output power is gradually reduced, and the energy saving purpose is achieved; the energy required by the main exhaust fan is mainly from the steam turbine, and the deficiency is compensated by the motor.
As one implementation mode, the variable speed clutch comprises a connecting shaft and a bearing I, wherein the end part of the connecting shaft is connected with the bearing I, the other side of the bearing I is connected with one side of a clutch main body, the other side of the clutch main body is connected with a bearing III, the other side of the bearing III is connected with a pinion, the pinion is connected with a large gear through a bearing IV, the lower part of the outer side of the pinion is provided with a bearing II, the upper part of the outer side of the large gear is provided with a bearing V, and the lower part of the outer side of the large gear is provided with a bearing IV;
before the speed change clutch works, the coupling shaft 1 drives the output end of the clutch main body 3 to rotate, the input end of the clutch main body 3, the pinion 6 and the bull gear 7 are in a static state, and the clutch main body 3 is in a disengaging state; when the turbine rotates, the input ends of the large gear 7, the small gear 6 and the clutch main body 3 are driven to rotate.
When the input rotational speed of the clutch body 3 exceeds the output rotational speed, the clutch body 3 is engaged and power from the turbine is transmitted through the large gear 7, the small gear 6, the clutch body 3 and the coupling shaft 1. The pinion 6 and the bull gear 7 are supported by a bearing III 5, a bearing V9, a bearing II 4 and a bearing IV 8, respectively, and the coupling shaft 1 and the clutch body 3 are supported by a bearing I2 and a bearing III 5.
As one embodiment, the synchronous motor includes a motor housing, a rotating shaft, a bearing, at least one synchronous motor unit, and at least one asynchronous motor unit; the synchronous motor unit comprises a synchronous stator and a synchronous rotor provided with permanent magnets, and the asynchronous motor unit comprises an asynchronous stator and an asynchronous rotor provided with conducting bars; the synchronous stator and the asynchronous stator are arranged on the inner surface of the motor shell, the synchronous rotor and the asynchronous rotor are coaxially and concentrically arranged on the rotating shaft at intervals, the rotating shaft is arranged in the shell of the motor shell through a bearing, so that the synchronous rotor on the rotating shaft is aligned with the synchronous stator, and the asynchronous rotor is aligned with the asynchronous stator. Because the permanent magnet is installed on the synchronous rotor, the conducting bar is installed on the asynchronous rotor, so that the starting cage and the permanent magnet are not overlapped and arranged on the same rotor.
Embodiment two:
the embodiment provides a working method of a sintering steam dragging system, which comprises the following steps:
the high-temperature steam generated by the waste heat steam boiler is conveyed to the steam turbine through a waste heat main steam pipeline and drives the steam turbine;
after the turbine drives the variable speed clutch to reduce speed, when the rotating speed of the low speed shaft of the variable speed clutch is equal to the rotating speed of the sintering main fan, the variable speed clutch enables the turbine to be connected with the fan, so that the turbine drives the main exhaust fan;
the synchronous motor is subjected to excitation system adjustment, so that the output power is gradually reduced, and the energy saving purpose is achieved; at this time, the energy required by the main exhaust fan mainly comes from the steam turbine, and the deficiency is compensated by the synchronous motor.
The main shaft fan structure comprises a steam turbine, a variable speed clutch, a synchronous motor and a sintering main shaft fan which are sequentially connected, wherein the steam turbine is connected with the main shaft fan through the variable speed clutch, and the combination and the separation of the steam turbine and the main exhaust fan are realized by adopting an overrunning clutch technology; the steam turbine of each main shaft fan structure is communicated with a waste heat steam boiler through a waste heat main steam pipeline;
when the rotating speed of the low-speed shaft of the variable-speed clutch is equal to that of the sintering main fan, the variable-speed clutch enables the steam turbine to be connected with the fan, so that the main exhaust fan is driven by the steam turbine, the synchronous motor is regulated by the excitation system, the output power is gradually reduced, and the energy saving purpose is achieved; the energy required by the main exhaust fan is mainly from the steam turbine, and the deficiency is compensated by the motor.
As an embodiment, the amount of steam recovered by the waste heat of the ring cooler of the sintering system fluctuates with the fluctuation of the yield of the sinter. The maximum amount of waste heat main steam for sintering is 46 tons/hour.
When the waste heat steam reaches 9 tons/hour, a main valve of a steam turbine is opened, the steam turbine can be started to operate singly, and the steam utilization efficiency is 72%. At this time, the load of the coaxial motor of the steam turbine is reduced, the steam and electricity are double-towed, and the other set of main exhaust fan is all-electrically towed. The lower steam supply quantity can only ensure the operation of one steam turbine, thereby meeting the requirement of waste heat steam utilization under the condition of small steam supply and reducing the production energy consumption.
The working condition can be maintained until the total amount of the main steam reaches 23 tons/hour (23 tons/hour is the maximum air inflow of the steam turbine), and the efficiency of the main steam is 79 percent at the moment, so that the most efficient operation of the steam turbine is achieved. The single turbine in the interval can ensure the highest efficiency of the turbine.
When the waste heat steam is more than 23 tons/hour, the other steam turbine is turned on, and the two main exhaust fans are of a steam-electric double-towing structure. Until a maximum main steam level of 46 tons/hour is reached. And rated production load is realized, and the double-turbine can operate efficiently.
The control theory fully utilizes the characteristic curve of the steam turbine, and the invention discloses a novel sintering steam dragging control mode, which has the following characteristics:
the lowest starting steam supply flow of the sintering steam dragging system is reduced. The rated 46 ton/hour steam towing system can be put into use when 9 ton/hour steam towing system is reached.
High-efficiency operation of the whole system is ensured. The turbine is most efficient when approaching and reaching rated power steam supply flow. When the total steam quantity is less than 23 tons/hour, the high-efficiency operation of one steam-electric double-dragging unit is ensured, and the other unit is all electrically dragged.
When the steam quantity is more than 23 tons/hour, the steam is divided into two turbines on average, so that the two turbines can operate and the efficiency is consistent.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The sintering steam dragging system is characterized by comprising a waste heat steam boiler and a plurality of main exhaust fan structures, wherein the main exhaust fan structures comprise a steam turbine, a variable speed clutch, a synchronous motor and a sintering main exhaust fan which are sequentially connected, the steam turbine is connected with the main exhaust fan through the variable speed clutch, and the combination and the separation of the steam turbine and the main exhaust fan are realized by adopting an overrunning clutch technology; the steam turbine of each main exhaust fan structure is communicated with a waste heat steam boiler through a waste heat main steam pipeline;
the multiple main exhaust fan structures comprise a first steam dragging main exhaust fan and a second steam dragging main exhaust fan, wherein a steam turbine of the first steam dragging main exhaust fan is communicated with a waste heat main steam pipeline, a steam turbine of the second steam dragging main exhaust fan is also communicated with the waste heat main steam pipeline, and one end of the waste heat main steam pipeline is communicated with a waste heat steam boiler;
the sintering steam dragging system is of a double-flue and double-main exhaust fan structure, and one annular cooler waste heat boiler drives two sets of steam dragging main exhaust fans, so that the distribution proportion of steam needs to be reasonably controlled;
when the low-speed shaft rotating speed of the variable speed clutch is equal to the rotating speed of the sintering main exhaust fan, the variable speed clutch enables the steam turbine to be connected with the fan, and therefore the main exhaust fan is driven by the steam turbine.
2. The sintering steam dragging system of claim 1, wherein the steam turbine comprises a waste heat steam source, a steam turbine high pressure cylinder and a surface heat exchanger, wherein the waste heat steam source is divided into two paths, one main steam a is connected with the steam turbine high pressure cylinder, and the other main steam b is connected with the surface heat exchanger.
3. The sintering steam dragging system of claim 2, wherein the steam turbine further comprises a steam turbine low pressure cylinder and a generator, the steam turbine high pressure cylinder and the steam turbine low pressure cylinder are connected with the generator, and a steam exhaust position of the steam turbine high pressure cylinder is connected with the surface heat exchanger through a pipeline.
4. The sintered vapor traction system of claim 1, wherein the variable speed clutch comprises a coupling shaft and a bearing i, wherein the coupling shaft is connected at an end to the bearing i, the bearing i is connected at the other side to one side of the clutch body, the clutch body is connected at the other side to the bearing iii, the bearing iii is connected at the other side to a pinion, and the pinion is connected to a bull gear via the bearing iv.
5. The sintering steam dragging system of claim 4, wherein the lower part of the outer side of the pinion is provided with a bearing II, the upper part of the outer side of the bull gear is provided with a bearing V, and the lower part is provided with a bearing IV.
6. The sintering pallet system of claim 1 wherein the synchronous motor comprises a motor housing, a shaft, a bearing, at least one synchronous motor unit, and at least one asynchronous motor unit; the synchronous motor unit comprises a synchronous stator and a synchronous rotor provided with permanent magnets, and the asynchronous motor unit comprises an asynchronous stator and an asynchronous rotor provided with conducting bars; the synchronous stator and the asynchronous stator are provided on an inner surface of the motor casing.
7. The sintering pallet system according to claim 6, wherein the synchronous rotor and the asynchronous rotor are coaxially and concentrically disposed on the shaft and spaced apart from each other, the shaft being mounted within the housing of the motor housing by bearings such that the synchronous rotor on the shaft is aligned with the synchronous stator and the asynchronous rotor is aligned with the asynchronous stator.
8. A method of operating a sintered vapor deposition system as claimed in any one of claims 1 to 7 comprising:
the high-temperature steam generated by the waste heat steam boiler is conveyed to the steam turbine through a waste heat main steam pipeline and drives the steam turbine;
after the turbine drives the variable speed clutch to reduce speed, when the rotating speed of the low speed shaft of the variable speed clutch is equal to the rotating speed of the sintering main exhaust fan, the variable speed clutch enables the turbine to be connected with the fan, so that the turbine drives the main exhaust fan;
the synchronous motor is subjected to excitation system adjustment, so that the output power is gradually reduced, and the energy saving purpose is achieved; at this time, the energy required by the main exhaust fan mainly comes from the steam turbine, and the deficiency is compensated by the synchronous motor.
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| CN202210384767.3A CN114718682B (en) | 2022-04-13 | 2022-04-13 | Sintering steam dragging system and method |
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| CN202210384767.3A CN114718682B (en) | 2022-04-13 | 2022-04-13 | Sintering steam dragging system and method |
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| CN114718682A CN114718682A (en) | 2022-07-08 |
| CN114718682B true CN114718682B (en) | 2024-02-09 |
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