CN110847992A - Power utilization system for iron and steel enterprises and method for improving power utilization efficiency - Google Patents
Power utilization system for iron and steel enterprises and method for improving power utilization efficiency Download PDFInfo
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- CN110847992A CN110847992A CN201911163234.7A CN201911163234A CN110847992A CN 110847992 A CN110847992 A CN 110847992A CN 201911163234 A CN201911163234 A CN 201911163234A CN 110847992 A CN110847992 A CN 110847992A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000003303 reheating Methods 0.000 claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000010248 power generation Methods 0.000 claims abstract description 10
- 239000003034 coal gas Substances 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 6
- 230000005611 electricity Effects 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 101100004027 Acanthocheilonema viteae AV71 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K13/006—Auxiliaries or details not otherwise provided for
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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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- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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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 power utilization system and a power utilization efficiency improvement method for an iron and steel enterprise, belonging to the field of energy utilization of the iron and steel enterprise, and comprising a reheating steam turbine, a dual-purpose motor, a blower and a steam circulating part; the steam circulating part is used for generating steam by utilizing coal steam of steel production equipment; the steam circulating part is communicated with the reheating turbine and provides steam for the reheating turbine; the dual-purpose motor, the blower and the shaft body of the reheating turbine are arranged in series; blowers are used for blowing air to steel production facilities. The steam turbine is a high-parameter single reheating steam turbine, so that the utilization efficiency of coal gas can be improved; the dual-purpose motor, the air blower and the reheating turbine are arranged in series, so that power generation and power utilization are not needed, equipment investment is reduced, and loss caused by multiple energy conversion is avoided. The dual-purpose motor can be used as a generator and a motor, so that the blower can stably run, and energy cannot be wasted due to overflow.
Description
Technical Field
The invention relates to the field of energy utilization of iron and steel enterprises, in particular to a power utilization system and a power utilization efficiency improving method for the iron and steel enterprises.
Background
The air blower is high energy consumption equipment of steel enterprises, and for AV71 air blower, its power can reach 10MW ~ 27MW, and for AV100 air blower, its power can reach 21 ~ 51 MW. For the driving mode of the blower, a motor drive or a steam turbine drive can be generally adopted. When the motor is used for driving, the electric power is mainly generated by an enterprise self-contained power station or purchased from a power grid. The motor driving system is simple, the starting is rapid, the reliability is high, the polling work is less, but the power consumption of the whole device is extremely high. The steam turbine drive relates to whole set of steam system and steam water system, and the system design is more complicated, and the start-up time is longer, and it is many to patrol and examine work, but has reduced the station service load. The turbine drive usually adopts high-temperature high-pressure steam admission steam parameter, and the unit adopts the straight condensing formula, and its steam turbine efficiency is lower, and the energy utilization efficiency of entire system is not high. Very individual projects adopt a relatively complex system to drive a blast furnace blower, for example, a steam turbine is adopted to drive a generator and the blast furnace blower simultaneously, or the steam turbine, the generator, the blast furnace blower and a gas turbine are connected in series, and the schemes have more or less problems due to complex shafting or other reasons and are not popularized.
Meanwhile, the steel industry has a large amount of blast furnace gas and coke oven gas. At present, the most effective utilization mode of blast furnace gas and coke oven gas is combustion, superheated steam is generated in a waste heat boiler through tail gas, and the superheated steam enters a steam turbine to drive a generator to generate electricity. Through adopting the once reheating technique to promote steam initial parameter to ultra-high temperature superhigh pressure or subcritical parameter, improved steam turbine generating efficiency greatly, relatively with the highly compressed unit that drags of high temperature, reheating power generation steam turbine efficiency can effectively promote more than 10%, has greatly improved entire system's energy utilization efficiency.
Based on the background, in order to improve the energy utilization efficiency of the whole iron and steel enterprise, the mainstream of the iron and steel enterprise is to use a high-parameter reheating power generation turbine to generate power and then use a motor to drive a blast furnace blower. However, this solution also has some problems. For example, power generation is performed before power utilization, multiple conversions of energy exist, the investment on a generator and a motor is needed, the investment amount is increased, and efficiency loss exists due to the multiple conversions of the energy.
Disclosure of Invention
The invention provides a power utilization system and a power utilization efficiency improvement method for an iron and steel enterprise, and aims to solve the problems of the power utilization system and the power utilization efficiency improvement method for the iron and steel enterprise in the prior art.
The invention is realized by the following steps:
a power utilization system for iron and steel enterprises comprises a reheating steam turbine, a dual-purpose motor, a blower and a steam circulating part;
the steam circulating part is used for generating steam by utilizing coal steam of steel production equipment;
the steam circulation part is communicated with the reheating turbine and provides steam for the reheating turbine;
the dual-purpose motor, the blower and a shaft body of the reheating turbine are arranged in series;
the blower is used for blowing air of steel production equipment.
In one embodiment of the present invention, the steam cycle part includes a boiler, a main steam line, a high pressure cylinder exhaust line, a reheat steam line, and a water feed line; the reheat steam turbine has a high pressure cylinder and a low pressure cylinder;
one end of the main steam pipeline is connected with the output end of the boiler, and the other end of the main steam pipeline is connected with the inlet of the high-pressure cylinder;
one end of the high-pressure cylinder steam exhaust pipeline is connected with an outlet of the high-pressure cylinder, and the other end of the high-pressure cylinder steam exhaust pipeline is connected with a reheating inlet of the boiler;
one end of the reheating steam pipeline is connected with a reheating outlet of the boiler, and the other end of the reheating steam pipeline is connected with an inlet of the low pressure cylinder;
one end of the water supply pipeline is connected with an outlet of the low pressure cylinder, and the other end of the water supply pipeline is connected with an input end of the boiler.
In an embodiment of the invention, a condenser is further disposed on the water supply pipeline.
In one embodiment of the invention, the dual-purpose motor and the blower form a working part;
and a clutch is arranged between the working part and the reheating turbine.
In one embodiment of the invention, the input end of the blower is provided with a speed change gear box, and an input shaft of the speed change gear box is coaxially arranged with a shaft body of the reheat steam turbine.
A method for improving the power utilization efficiency of iron and steel enterprises, which uses the power utilization system of the iron and steel enterprises, comprises the main working steps:
the boiler uses coal gas generated by steel production equipment to combust and heat to generate new steam;
the new steam enters the high-pressure cylinder and does work in the high-pressure cylinder to drive the blower;
steam is discharged out of the high-pressure cylinder and enters the boiler to be reheated to generate reheated steam;
the reheated steam enters the low pressure cylinder and does work in the low pressure cylinder to drive the blower;
and steam is discharged out of the low-pressure cylinder to form water, and the water enters the boiler again to be heated.
In one embodiment of the invention, the method comprises the following steps of:
when the output power of the reheating turbine is larger than the required power of the blower, the dual-purpose motor is in a power generation state and is used for generating power;
when the output power of the reheating steam turbine is smaller than the required power of the blower, the dual-purpose motor is in a motor state to provide supplementary power for the blower.
In an embodiment of the present invention, the power utilization system for steel enterprises, which uses the above, includes a turbine separation step:
when the reheat steam turbine fails;
and the clutch is disengaged, the connection between the working part and the reheating turbine is released, and the blower is driven by the dual-purpose motor.
The invention has the beneficial effects that: according to the power utilization system and the power utilization efficiency improvement method for the iron and steel enterprises, the steam turbine is a high-parameter single reheating steam turbine, so that the utilization efficiency of coal gas can be improved; whether the gear box is arranged or not is determined according to whether the rotating speeds of the steam turbine and the dual-purpose motor are consistent with that of the blast furnace blower or not, and the dual-purpose motor, the blower and the reheating steam turbine are arranged in series, so that power consumption after power generation is not needed any more, equipment investment is reduced, and loss of multiple energy conversion is avoided. The dual-purpose motor can be used as a generator and a motor, so that the blower can stably run, and energy cannot be wasted due to overflow. A clutch is arranged between the reheating turbine and the dual-purpose motor of the working part, and the turbine can be separated from the dual-purpose motor when in failure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a system structure of a power utilization system for a steel enterprise according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power utilization system of a steel enterprise without a transmission gear box in another embodiment.
Icon: 1-a reheat steam turbine; 2-a dual-purpose motor; 3-a change speed gearbox; 4-a blower; 5-a boiler; 6-a clutch; 7-a condenser; 8-a main steam line; 9-high pressure cylinder exhaust pipe; 10-reheat steam line; 11-water supply pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Example one
The embodiment provides a power utilization system for an iron and steel enterprise, referring to fig. 1, the power utilization system for the iron and steel enterprise comprises a reheating steam turbine 1, a dual-purpose motor 2, a blower 4 and a steam circulating part;
the steam circulating part is used for generating steam by utilizing coal steam of steel production equipment; the steam circulating part is communicated with the reheating turbine 1 and provides steam for the reheating turbine 1;
the dual-purpose motor 2 and the blower 4 are combined to form a working part, and the working part is connected with a shaft body of the reheating turbine 1 in series through a clutch 6;
the blower 4 is used for blowing of steel production equipment.
The power utilization system for the iron and steel enterprises realizes that the steam turbine directly drives the blower 4 to operate through the dual-purpose motor 2, the blower 4 and the reheating steam turbine 1 which are arranged in series, and then power generation and power utilization are needed, so that equipment investment is reduced, and loss of multiple energy conversion is avoided. In the steel production process, the coal gas generation has fluctuation, so the dual-purpose fan can alternately play the role of a generator when power is excessive and the role of a motor when power is insufficient, and the continuous and stable operation of the blower 4 is guaranteed.
Specifically, the steam circulation part comprises a boiler 5, a main steam pipeline 8, a high-pressure cylinder steam exhaust pipeline 9, a reheating steam pipeline 10 and a water supply pipeline 11; the reheat steam turbine 1 has a high pressure cylinder and a low pressure cylinder;
one end of the main steam pipeline 8 is connected with the output end of the boiler 5, and the other end is connected with the inlet of the high-pressure cylinder;
one end of a high-pressure cylinder steam exhaust pipeline 9 is connected with an outlet of the high-pressure cylinder, and the other end of the high-pressure cylinder steam exhaust pipeline is connected with a reheating inlet of the boiler 5;
one end of a reheating steam pipeline 10 is connected with a reheating outlet of the boiler 5, and the other end of the reheating steam pipeline is connected with an inlet of the low-pressure cylinder;
the export of low pressure jar is connected to water supply line 11 one end, and the input of boiler 5 is connected to the other end, still is provided with condenser 7 on the water supply line 11.
The whole steam circulation part and the reheating steam turbine 1 are matched to form a complete steam circulation system: water is combusted and heated by coal gas in the boiler 5 to form high-temperature new steam, the new steam enters the high-pressure cylinder through the main steam pipeline 8 to do work in the high-pressure cylinder, the heat of the steam formed after the work is done is reduced, the steam enters the boiler 5 through the high-pressure cylinder exhaust pipeline 9 to be reheated, the reheated steam after the reheating enters the low-pressure cylinder through the reheating steam pipeline 10 to do work in the low-pressure cylinder. The steam after applying work is condensed into water through the condenser 7 in the water supply pipeline 11, and then flows back to the boiler 5 through the water supply pipeline 11 to be heated, and enters the next circulation.
In this embodiment, since the designed rotation speed of the reheat turbine 1 is different from the rotation speed of the blower 4, the direct coaxial connection cannot be established in series at this time, but a corresponding speed change gear box 3 needs to be provided at the input end of the blower 4 to be established in series after speed change, and at this time, the input shaft of the speed change gear box 3 is coaxially provided with the shaft body of the reheat turbine 1. In other embodiments, if the rotation speed of the reheat turbine 1, the rotation speed of the dual-purpose motor 2, and the rotation speed of the blower 4 are the same, the three may be directly connected in series coaxially without an additional change-speed gear box 3. Similarly, when the rotation speeds of the dual-purpose motor 2 are different independently, the dual-purpose motor 2 may be provided with a corresponding speed change gear box 3, please refer to fig. 2; and other situations where there is a difference in rotational speed can be solved by a corresponding arrangement of the change speed gearbox 3.
In the specific implementation, the steam inlet parameter of the steam turbine can be high temperature and ultrahigh pressure (13.2 MPa/535 ℃), also can be ultrahigh temperature and ultrahigh pressure (13.2MPa/566 ℃), and also can be subcritical (16.7MPa/566 ℃); the steam turbine can be operated at a high rotating speed (more than 3000r/min) or at a conventional rotating speed (3000 r/min); the steam turbine can adopt a single-cylinder single-rotor structure or a double-cylinder double-rotor structure. These can all be selected according to the actual field situation, and the direct output of power to air-blower 4 has been realized to whole iron and steel enterprise's power utilization system, has improved the utilization efficiency of power.
The power utilization system for the iron and steel enterprises, provided by the invention, does not need to generate electricity first and then use the electricity, so that the equipment investment is reduced, and the loss of multiple energy conversion is avoided. The dual-purpose motor 2 can be used as a generator and also can be used as a motor, when the output power of the steam turbine is greater than the power of the blast furnace blower 4, the dual-purpose motor 2 is a generator, and the electric energy is input into a power grid. When the output power of the steam turbine is smaller than that of the blower 4, the dual-purpose motor 2 is a motor, and absorbs electric energy from a power grid to complement the power difference between the steam turbine and the blower 4.
Example two
The embodiment provides a method for improving the power utilization efficiency of an iron and steel enterprise, and the power utilization system of the iron and steel enterprise, which comprises the following main working steps:
the boiler 5 uses coal gas generated by steel production equipment to burn and heat to generate new steam;
the new steam enters the high-pressure cylinder and does work in the high-pressure cylinder to drive the blower 4;
the steam is discharged out of the high-pressure cylinder and enters the boiler 5 to be reheated to generate reheated steam;
the reheated steam enters a low-pressure cylinder and does work in the low-pressure cylinder to drive an air blower 4;
the steam is discharged out of the low-pressure cylinder to form water, and the water enters the boiler 5 again for heating.
In the actual use process, because the coal gas generation has volatility in the steel production process, the method for improving the power utilization efficiency of the steel enterprises further comprises the step of switching the working state of the dual-purpose motor 2:
when the output power of the reheating turbine 1 is larger than the required power of the blower 4, the dual-purpose motor 2 is in a power generation state for generating power, and the reheating turbine 1 drives the blower 4 and the dual-purpose motor 2 at the same time;
when the output power of the reheating turbine 1 is smaller than the required power of the blower 4, the dual-purpose motor 2 is in a motor state to provide supplementary power for the blower 4, and the blower 4 is stably operated through the simultaneous power output of the dual-purpose motor 2 and the reheating turbine 1.
In addition, aiming at the possible fault of the reheating turbine 1 in the using process, the method for improving the power utilization efficiency of the iron and steel enterprises further comprises the following turbine separation steps:
when the reheat steam turbine 1 is out of order; the clutch 6 is disengaged, the connection between the working part and the reheat turbine 1 is released, and the blower 4 driven by the dual-purpose motor 2 is used.
At the moment, the dual-purpose motor 2 independently drives the blower 4 to stably operate, and the reheated steam turbine 1 which is not matched is overhauled.
According to the method for improving the power utilization efficiency of the iron and steel enterprises, the steam turbine is the high-parameter single-reheat steam turbine 1, so that the utilization efficiency of coal steam can be improved; whether the gear box is arranged or not is determined according to whether the rotating speed of the steam turbine and the dual-purpose motor 2 is consistent with that of the blast furnace blower 4 or not, and the dual-purpose motor 2, the blower 4 and the reheating steam turbine 1 are arranged in series, so that power generation and then power utilization are not needed, equipment investment is reduced, and loss caused by multiple energy conversion is avoided. The dual-purpose motor 2 can be used as a generator and a motor, so that the blower 4 can stably run, and energy cannot be wasted due to overflow. A clutch 6 is arranged between the reheating turbine 1 and the dual-purpose motor 2 of the working part, and the turbine can be separated from the dual-purpose motor 2 when the turbine fails.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A power utilization system for iron and steel enterprises is characterized by comprising a reheating steam turbine, a dual-purpose motor, a blower and a steam circulating part;
the steam circulating part is used for generating steam by utilizing coal steam of steel production equipment;
the steam circulation part is communicated with the reheating turbine and provides steam for the reheating turbine;
the dual-purpose motor, the blower and a shaft body of the reheating turbine are arranged in series;
the blower is used for blowing air of steel production equipment.
2. The steel enterprise power utilization system according to claim 1, wherein the steam cycle section includes a boiler, a main steam line, a high pressure cylinder steam exhaust line, a reheat steam line, and a water feed line; the reheat steam turbine has a high pressure cylinder and a low pressure cylinder;
one end of the main steam pipeline is connected with the output end of the boiler, and the other end of the main steam pipeline is connected with the inlet of the high-pressure cylinder;
one end of the high-pressure cylinder steam exhaust pipeline is connected with an outlet of the high-pressure cylinder, and the other end of the high-pressure cylinder steam exhaust pipeline is connected with a reheating inlet of the boiler;
one end of the reheating steam pipeline is connected with a reheating outlet of the boiler, and the other end of the reheating steam pipeline is connected with an inlet of the low pressure cylinder;
one end of the water supply pipeline is connected with an outlet of the low pressure cylinder, and the other end of the water supply pipeline is connected with an input end of the boiler.
3. The power utilization system for steel enterprises according to claim 2, wherein the water supply pipeline is further provided with a condenser.
4. The power utilization system for iron and steel enterprises according to claim 2, wherein a dual-purpose motor and the blower form a working part;
and a clutch is arranged between the working part and the reheating turbine.
5. The power utilization system for iron and steel enterprises according to claim 2, wherein the input end of the blower is provided with a speed change gear box, and the input shaft of the speed change gear box is coaxially arranged with the shaft body of the reheat turbine.
6. A method for improving power utilization efficiency of an iron and steel enterprise, using the power utilization system of the iron and steel enterprise according to any one of claims 2 to 5, comprising the main working steps of:
the boiler uses coal gas generated by steel production equipment to combust and heat to generate new steam;
the new steam enters the high-pressure cylinder and does work in the high-pressure cylinder to drive the blower;
steam is discharged out of the high-pressure cylinder and enters the boiler to be reheated to generate reheated steam;
the reheated steam enters the low pressure cylinder and does work in the low pressure cylinder to drive the blower;
and steam is discharged out of the low-pressure cylinder to form water, and the water enters the boiler again to be heated.
7. The method for improving power utilization efficiency of iron and steel enterprises according to claim 6, comprising the step of switching the working state of the dual-purpose motor:
when the output power of the reheating turbine is larger than the required power of the blower, the dual-purpose motor is in a power generation state and is used for generating power;
when the output power of the reheating steam turbine is smaller than the required power of the blower, the dual-purpose motor is in a motor state to provide supplementary power for the blower.
8. A method for improving power utilization efficiency of an iron and steel enterprise, using the power utilization system of an iron and steel enterprise according to claim 4, comprising a turbine disengaging step of:
when the reheat steam turbine fails;
and the clutch is disengaged, the connection between the working part and the reheating turbine is released, and the blower is driven by the dual-purpose motor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943644A (en) * | 2021-04-06 | 2021-06-11 | 重庆赛迪热工环保工程技术有限公司 | Multifunctional coupling type blast furnace blower driving system and control method thereof |
Citations (6)
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| CN112943644A (en) * | 2021-04-06 | 2021-06-11 | 重庆赛迪热工环保工程技术有限公司 | Multifunctional coupling type blast furnace blower driving system and control method thereof |
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