CN116241854A - Continuous casting and direct rolling heat preservation screw power generation system and method - Google Patents
Continuous casting and direct rolling heat preservation screw power generation system and method Download PDFInfo
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- CN116241854A CN116241854A CN202310216405.8A CN202310216405A CN116241854A CN 116241854 A CN116241854 A CN 116241854A CN 202310216405 A CN202310216405 A CN 202310216405A CN 116241854 A CN116241854 A CN 116241854A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/028—Steam generation using heat accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a continuous casting and direct rolling heat preservation screw power generation system and a method, wherein the system comprises a screw power generator set, a heat conduction oil heat accumulator and a plurality of heat absorption modules for power generation, wherein each heat absorption module for power generation is provided with a heat absorption housing formed by a plurality of heat conduction copper pipes in parallel, each heat absorption housing is covered on a high-temperature billet of a continuous casting machine, one end of each heat conduction copper pipe of each heat absorption housing is provided with a heat conduction oil inlet, a heat conduction oil circulating oil pump is connected at the heat conduction oil inlet, the other end of each heat conduction copper pipe of each heat absorption housing is provided with a heat conduction oil outlet, the heat conduction oil outlet is communicated with the heat conduction oil heat accumulator through a heat conduction oil pipeline, and the heat conduction oil heat accumulator is communicated with the screw power generator set through a steam pipeline. The invention firstly utilizes the heat radiation of the billet to the heat absorption housing, fully collects heat while preserving heat of the billet, converts the heat into usable steam, and then utilizes steam pressure to generate power; the heat conduction oil is utilized in the internal circulation structure of the heat accumulator for the first time, so that the heat accumulator is ensured to stably generate saturated steam, and meanwhile, the temperature of the heat conduction oil is reduced.
Description
Technical Field
The invention relates to the technical field of high-temperature billet heat preservation and direct rolling of a continuous casting machine of a smelting steel mill, in particular to a continuous casting and direct rolling heat preservation screw power generation system and method.
Background
In the current continuous casting production, after a billet is pulled out of a crystallizer of a continuous casting machine, the billet is cooled gradually by radiating heat to the periphery, cut when a certain length is reached, enter a cooling bed, further cool by water spraying cooling, ventilation and convection strengthening or other methods, form a finished billet, and wait for entering the next working procedure. In this process, the temperature of the molten steel gradually decreases below the melting point of the steel billet, but the temperature of the steel billet itself is still as high as about 1000 ℃, and the carried heat is still very large.
At present, the utilization of heat carried by a steel billet is mainly focused on the field of hot charging and hot conveying of the steel billet, and the heat loss is reduced by directly conveying the steel billet with higher temperature into a heating furnace. However, due to factors such as process connection or production limitation, the proportion of hot charging and hot delivery of the steel billet is relatively low, and a large amount of steel billets are still placed in the air to be gradually cooled, so that heat loss is caused, energy waste is caused, heat pollution is caused to the surrounding environment, heatstroke and other injuries of workers are easily caused, meanwhile, surrounding equipment is enabled to run at a high Wen Dangzhong, and the service life of the equipment is shortened.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the continuous casting and direct rolling heat preservation screw generating system which is reasonable in design, realizes direct rolling, can simultaneously utilize billet heat to generate electricity, and meanwhile, cancels the gas consumption of a heating furnace, and has huge benefit.
The invention aims to solve the technical problem of providing a power generation method adopting the continuous casting and direct rolling heat preservation screw power generation system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the continuous casting and direct rolling heat preservation screw power generation system is characterized by comprising a screw power generator set, a heat conduction oil heat accumulator and a plurality of heat absorption modules for power generation, wherein each heat absorption module for power generation is provided with a heat absorption housing formed by a plurality of heat conduction copper pipes in parallel, each heat absorption housing is covered on a high-temperature billet of the continuous casting machine, one end of each heat conduction copper pipe of each heat absorption housing is provided with a heat conduction oil inlet, a heat conduction oil circulating pump is connected at the heat conduction oil inlet, the other end of each heat conduction copper pipe of each heat absorption housing is provided with a heat conduction oil outlet, the heat conduction oil outlet is communicated with the heat conduction oil heat accumulator through a heat conduction oil pipeline, the heat conduction oil heat accumulator is provided with a steam pipeline communicated with the screw power generator set, and a pressure transmitter is arranged on the steam pipeline,
the screw generator set comprises a screw machine and a generator connected with the screw machine, wherein the screw machine is connected with the generator through a speed reducer, and the generator is externally connected with a power transmission device through a high-voltage power distribution short-circuiting device;
the screw machine comprises a screw machine body provided with a steam channel, wherein the steam channel is provided with a steam inlet and a steam outlet, the steam inlet is connected with a steam pipeline of the heat conduction oil heat accumulator, a pneumatic stop valve is arranged at the steam inlet, the steam outlet is connected with a closed evaporative cooler through a steam exhaust pipeline, a condensed water outlet and an exhaust port are arranged on the closed evaporative cooler, the condensed water outlet of the closed evaporative cooler is connected with a liquid storage device, and the exhaust port of the closed evaporative cooler is connected with a vacuum pump.
The technical problem to be solved by the invention can also be solved by the following technical scheme that the heat absorption module for power generation is formed by arranging heat conduction copper pipes with the diameter of 20mm side by side into square covers, wherein the heat conduction copper pipes are connected end to end, one end part of two heat conduction copper pipes on the outermost layer is provided with a heat conduction oil inlet, and the other end part of the two heat conduction copper pipes on the outermost layer is provided with a heat conduction oil outlet.
The technical problem to be solved by the invention can also be solved by the following technical scheme that the heat conduction oil heat accumulator is provided with a horizontal heat accumulation tank, a safety valve, a steam discharge pipeline valve group, a heat accumulator water supplementing pipeline valve group, a pressure gauge and a blow-down valve are arranged on the horizontal heat accumulation tank, the heat accumulator water supplementing pipeline valve group is connected with a water tank through a water supplementing pipeline, a heat conduction oil internal circulation pipeline is arranged in the horizontal heat accumulation tank, one end of the heat conduction oil internal circulation pipeline is connected with a heat conduction copper pipe of a heat absorption housing through a heat conduction oil pipeline, the other end of the heat conduction oil internal circulation pipeline is connected with an oil tank, and the steam discharge pipeline valve group is connected with a closed evaporation cooler.
The technical problem to be solved by the invention can also be realized by the following technical scheme that the oil tank is provided with an oil inlet connected with a heat conduction oil internal circulation pipeline, a filter assembly is arranged at the oil inlet, the filter assembly comprises a filter shell arranged at the oil inlet of the oil tank and a filter screen coated outside the filter shell, the filter shell is also filled with a plurality of porous graphite balls, the filter shell is connected with a pipe joint arranged at the oil inlet through a quick connector, and a plurality of oil holes are formed in the filter shell.
The technical problem to be solved by the invention can also be realized by the following technical scheme that three closed evaporative coolers are arranged and are connected in sequence.
The technical problem to be solved by the invention can be further solved by the following technical scheme that a plurality of grooves for increasing the heated area are arranged on the inner wall of the heat absorption housing, and the grooves are arranged along the axis of the heat conduction copper pipe.
The continuous casting and direct rolling heat preservation screw power generation method is characterized in that the continuous casting and direct rolling heat preservation screw power generation system is adopted to realize power generation, a heat absorption cover shell is covered on a high-temperature steel billet of a continuous casting machine, nonflammable heat conduction oil is used in the heat absorption cover shell, the pressure in a heat conduction copper pipe is controlled to be 0.05-0.15MPa under the action of a heat conduction circulating oil pump, the heat conduction oil is heated to 200-400 ℃ through the steel billet, the heat conduction oil enters a heat conduction oil heat accumulator through the heat conduction copper pipe, water in the heat conduction oil heat accumulator is heated, a large amount of steam is generated by the water, and the steam pushes a screw power generator set through a steam pipeline to start the screw power generator set.
The technical problems to be solved by the invention can be realized by the following technical proposal, the power generation process of the screw generator set is that,
before the screw generator set rotates, the heat conducting oil heat accumulator discharges steam into the steam pipeline to raise the pressure in the steam pipeline to 0.1MPA gradually, and the computer picture is displayed and interlocked through the pressure transmitter; simultaneously, starting a vacuum pump, vacuumizing a steam channel in the closed evaporative cooler and the screw machine body, and controlling the vacuum degree of the steam channel of the closed evaporative cooler and the vacuum degree of the steam channel of the screw machine body to be-70 kPa-90 kPa; when the pressure in the steam pipeline reaches 0.2MPA, a pneumatic stop valve on the screw machine is opened, the opening of the pneumatic stop valve is gradually opened, and steam enters the screw machine from the heat conduction oil heat accumulator to realize power generation of a generator; when the pressure in the steam pipeline exceeds 0.3MPA, the heat conduction oil heat accumulator is exhausted, so that the pressure in the steam pipeline is always kept between 0.2MPA and 0.3MPA.
The technical problem to be solved by the invention can also be solved by the following technical scheme that the opening control method of the pneumatic stop valve comprises the following steps that firstly, the opening of the pneumatic stop valve is controlled to be 10% -40%, a screw machine starts to operate, the rotating speed reaches 1200-3000 r, and the screw machine is transmitted to a generator to enable the generator to rotate, and at the moment, the generating power is 0 because the rotating speed of the generator is less than 1200 r; continuously opening the pneumatic stop valve, when the opening gradually increases to 100%, the rotating speed of the screw machine is increased from 3000 to 5000, the rotating speed of the generator gradually increases through the speed reducer, when the rotating speed of the generator is increased to 1200, the generator is always in a power consumption state, and when the rotating speed of the generator set is greater than or equal to 1200, the generator starts to generate electricity; when the rotating speed of the screw machine reaches more than 5000 revolutions, the generator transmits 10KV voltage through a high-voltage distribution short-circuiting device.
The technical problem to be solved by the invention can be also realized by the following technical scheme that the heat conduction oil adopts alkylbenzene type heat conduction oil, alkyl naphthalene type heat conduction oil, biphenyl ether heat conduction oil or alkyl diphenyl ether type heat conduction oil.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the heat radiation of the billet to the heat absorption housing is utilized for the first time, the heat is fully collected while the billet is insulated by utilizing the heat absorption characteristic of the heat absorption housing, then the billet is converted into usable steam, and then the steam pressure is utilized for generating electricity;
secondly, the invention utilizes the internal circulation structure of the heat conduction oil in the heat conduction oil heat accumulator for the first time, ensures the stable saturated steam generation of the heat conduction oil heat accumulator, and reduces the temperature of the heat conduction oil at the same time;
thirdly, the invention uses the steam to push the screw generator to generate electricity, uses the vacuum pump to generate negative pressure of-70 kPa-90 kPa, and further preferably-80 kPa, and can generate electricity when the steam reaches the pressure of 0.2MPA, thereby reducing the pressure required by the steam;
fourth, the invention adopts the closed evaporative cooler and the liquid storage device, so as to ensure the recycling of the steam condensate.
Drawings
FIG. 1 is a schematic structural diagram of a continuous casting and direct rolling heat preservation screw power generation system according to the invention;
FIG. 2 is a block diagram of a thermally conductive filter housing;
FIG. 3 is a diagram showing a distribution of heat absorbing modules for continuous casting machine power generation;
FIG. 4 is a block diagram of a thermally conductive circulating oil pump;
FIG. 5 is a block diagram of a thermally conductive oil regenerator;
fig. 6 is a structural diagram of a screw generator set.
In the figure: the high-temperature billet of the continuous casting machine, the 2-heat absorption housing, the 3-heat conduction oil heat accumulator, the 4-pressure transmitter, the 5-pneumatic stop valve, the 6-screw machine, the 7-closed evaporative cooler, the 8-vacuum pump, the 9-generator, the 10-speed reducer, the 11-heat conduction circulating oil pump, the 12-oil tank, the 13-heat conduction oil inlet and the 14-heat conduction oil outlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1-6, a continuous casting and direct rolling heat preservation screw power generation system comprises a screw power generation unit, a heat conduction oil heat accumulator and a plurality of heat absorption modules for power generation, wherein each heat absorption module for power generation is provided with a heat absorption housing 2 formed by a plurality of heat conduction copper pipes side by side, each heat absorption housing 2 is covered on a high-temperature billet 1 of a continuous casting machine, one end of each heat conduction copper pipe of each heat absorption housing 2 is provided with a heat conduction oil inlet 13, a heat conduction oil circulation pump 11 is connected to the heat conduction oil inlet, the heat conduction oil circulation pump 11 provides 0.1mpa pressure for heat conduction oil, power is circularly provided for the heat conduction oil in the power generation heat insulation housing, the other end of each heat conduction copper pipe of each heat absorption housing 2 is provided with a heat conduction oil outlet 14, each heat conduction oil outlet is communicated with the heat conduction oil heat accumulator 3 through a heat conduction oil pipeline, a steam pipeline communicated with the screw power generation unit is arranged on each heat conduction oil heat accumulator 3, and a pressure transmitter 4 is arranged on each steam pipeline;
the screw generator set comprises a screw machine 6 and a generator 9 connected with the screw machine, wherein the screw machine 6 is connected with the generator 9 through a speed reducer 10, and the generator 9 is externally connected with a power transmission device through a high-voltage power distribution short-circuiting device;
the screw machine 6 comprises a screw machine body provided with a steam channel, a steam inlet and a steam outlet are arranged on the steam channel, the steam inlet is connected with a steam pipeline of the heat conduction oil heat accumulator 3, a pneumatic stop valve 5 is arranged at the steam inlet, the pneumatic stop valve 5 is arranged at the output side of the pressure transmitter 4, the steam outlet is connected with a closed type evaporative cooler 7 through a steam outlet pipeline, a condensed water outlet and an exhaust port are arranged on the closed type evaporative cooler 7, the condensed water outlet of the closed type evaporative cooler 7 is connected with a liquid storage device, a vacuum pump 8 is connected at the exhaust port of the closed type evaporative cooler 7, the heat conduction oil heat accumulator 3 and the closed type evaporative cooler 7 are of any product structure disclosed in the prior art, and the types and structures of the heat conduction circulating oil pump 11 and the vacuum pump 8 are set according to use requirements;
the system is also provided with an oil tank 12 for receiving heat conduction oil in the heat conduction copper pipe, the oil tank 12 is respectively connected with the heat conduction circulating oil pump 11 and the heat conduction oil heat accumulator 3 through pipelines, and the oil tank 12, the heat conduction circulating oil pump 11, the heat absorption housing 2, the heat conduction oil heat accumulator 3 and the heat conduction oil internal circulation pipeline form a heat conduction oil internal circulation system.
The heat conduction oil adopts alkylbenzene type heat conduction oil, naphthalene alkyl type heat conduction oil, biphenyl ether heat conduction oil or alkyl biphenyl ether heat conduction oil, and further preferably biphenyl ether heat conduction oil. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the boiling point of the alkylbenzene type heat conduction oil is 170-180 ℃, the condensation point is-80 ℃, and the upgrading and regenerating products of the mineral type heat conduction oil have higher boiling range and self-ignition point, better thermal stability and oxidation stability and longer service life, and are mainly used for heat transfer of liquid phase heating systems in petrochemical industry, chemical industry, fine chemical industry and other industries;
the boiling point of the alkyl naphthalene type heat conduction oil is 240-280 ℃;
the boiling point of the alkyl biphenyl type heat conduction oil is more than 300 ℃;
the biphenyl diphenyl ether conduction oil has the advantages of optimal heat resistance in the conduction oil, small carbon deposition tendency and long service life. The method is suitable for a liquid phase heating system at 12-400 ℃ or a gas phase heating system at 257-400 ℃ and is mainly applied to high-temperature heat transfer at more than 350 ℃ such as polymerization of chemical fibers such as terylene, chinlon and the like, spinning, heating machine hot box photo-thermal power generation and the like.
The condensation point of the alkyl diphenyl ether heat conduction oil is minus 54 ℃ and the maximum use temperature is not more than 330 ℃.
Finally, the system selects biphenyl diphenyl ether heat conduction oil, and has high heat conduction coefficient and good high temperature resistance.
The heat absorption module for power generation is formed by arranging square covers side by heat conduction copper pipes with the diameter of 20mm, wherein the heat conduction copper pipes are connected end to end, a heat conduction oil inlet is formed in one end part of each of the two heat conduction copper pipes on the outermost layer, a heat conduction oil outlet is formed in the other end part of each of the two heat conduction copper pipes on the outermost layer, the heat conduction oil outlets are mainly distributed in a continuous casting machine withdrawal and straightening machine area and a post-cutting roller way area, the continuous casting machine is divided into 8 flows, 6 power generation covers are arranged in each flow, 48 power generation cover modules are arranged in total, and the heat conduction oil is divided into an inlet and an outlet and then is converged into a main pipe. The liquid storage device adopts a liquid storage tank and a pipeline related to the liquid storage tank.
The heat conduction oil heat accumulator is provided with a horizontal heat accumulation tank, a safety valve, a steam discharge pipeline valve group, a heat accumulator water supplementing pipeline valve group, a pressure gauge and a blow-down valve are arranged on the horizontal heat accumulation tank, the heat accumulator water supplementing pipeline valve group is connected with a water tank through a water supplementing pipeline, a heat conduction oil internal circulation pipeline is arranged in the horizontal heat accumulation tank, one end of the heat conduction oil internal circulation pipeline is connected with a heat conduction copper pipe of a heat absorption housing, the other end of the heat conduction oil internal circulation pipeline is connected with an oil tank 12, and the steam discharge pipeline valve group is connected with a closed evaporative cooler 7;
the high-temperature heat conduction oil at 300 ℃ circulates in the heat conduction oil heat accumulator, so that stable saturated steam is generated in the heat conduction oil heat accumulator, and the pressure is not lower than 0.2MPA; if the steam generated in the heat conduction oil heat accumulator exceeds 1.0MPA, the steam can be discharged through the safety valve group, the safety of the heat conduction oil heat accumulator is guaranteed, when the water level in the heat conduction oil heat accumulator is low, water is supplemented through the heat accumulator water supplementing pipeline valve group, the steam generation amount is guaranteed, and meanwhile the heat conduction oil is guaranteed to be cooled and recycled.
The inner wall of the heat absorption housing is provided with a plurality of grooves for increasing the heated area, and the grooves are arranged along the axis of the heat conduction copper pipe.
The oil tank is provided with an oil inlet connected with a heat conduction oil internal circulation pipeline, a filter assembly is arranged at the oil inlet, the filter assembly comprises a filter shell arranged at the oil inlet of the oil tank and a filter screen coated outside the filter shell, a plurality of porous graphite balls are further filled in the filter shell, the filter shell is connected with a pipe joint arranged at the oil inlet through a quick connector, a plurality of oil passing holes are formed in the filter shell, and heat conduction oil is filtered, so that blockage of a pipeline is avoided.
The continuous casting and direct rolling heat preservation screw power generation method adopts the continuous casting and direct rolling heat preservation screw power generation system to realize power generation.
The power generation process of the screw generator set is that,
before the screw generator set rotates, the heat conducting oil heat accumulator discharges steam into the steam pipeline to raise the pressure in the steam pipeline to 0.1MPA gradually, and the computer picture is displayed and interlocked through the pressure transmitter; simultaneously, starting a vacuum pump, vacuumizing a steam channel in the closed evaporative cooler and the screw machine body, and controlling the vacuum degree of the steam channel of the closed evaporative cooler and the vacuum degree of the steam channel of the screw machine body to be-70 kPa-90 kPa; when the pressure in the steam pipeline reaches 0.2MPA, a pneumatic stop valve on the screw machine is opened, the opening of the pneumatic stop valve is gradually opened, and steam enters the screw machine from the heat conduction oil heat accumulator to realize power generation of a generator; when the pressure in the steam pipeline exceeds 0.3MPA, the heat conducting oil heat accumulator is exhausted, so that the pressure in the steam pipeline is always kept between 0.2MPA and 0.3MPA.
The opening control method of the pneumatic stop valve comprises the steps that firstly, the opening of the pneumatic stop valve is controlled to be 10% -40%, a screw machine starts to operate, the rotating speed reaches 1200-3000 revolutions, the rotating speed is transmitted to a generator set, the generator set is enabled to rotate, and at the moment, the generating power is 0; the opening degree of the pneumatic stop valve is gradually increased to 100%, the rotating speed of the screw machine is increased to 5000 revolutions from 3000 revolutions, the screw machine is transmitted to the generator set through the transmission, the generator set starts to rotate, when the rotating speed of the generator set is smaller than 1200 revolutions, the generator set consumes electricity, the generator is kept to be continuous, a foundation is laid for continuous power generation, and when the rotating speed of the generator set is larger than or equal to 1200 revolutions, the generator generates power; when the rotating speed of the screw machine reaches more than 5000 revolutions, the generator transmits 10KV voltage through a high-voltage distribution short-circuiting device. Meanwhile, the waste steam discharged by the screw machine enters three closed evaporative coolers through pipelines, the power of a motor is 75KW, the steam passes through the closed evaporative coolers, cooling water is recovered to a liquid storage tank, the liquid storage tank automatically discharges water to a certain liquid level, and the water belongs to desalted water and can be reused; the rest waste gas is discharged to the atmosphere through a vacuum pump, so that low-pressure steam and low-heat power generation are realized.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. A continuous casting and direct rolling heat preservation screw power generation system is characterized by comprising a screw power generator set, a heat conduction oil heat accumulator and a plurality of heat absorption modules for power generation, wherein each heat absorption module for power generation is provided with a heat absorption housing formed by a plurality of heat conduction copper pipes in parallel, each heat absorption housing is covered on a high-temperature billet of the continuous casting machine, one end of each heat conduction copper pipe of each heat absorption housing is provided with a heat conduction oil inlet, a heat conduction oil circulating pump is connected at the heat conduction oil inlet, the other end of each heat conduction copper pipe of each heat absorption housing is provided with a heat conduction oil outlet, the heat conduction oil outlet is communicated with the heat conduction oil heat accumulator through a heat conduction oil pipeline, the heat conduction oil heat accumulator is provided with a steam pipeline communicated with the screw power generator set, and a pressure transmitter is installed on the steam pipeline,
the screw generator set comprises a screw machine and a generator connected with the screw machine, wherein the screw machine is connected with the generator through a speed reducer, and the generator is externally connected with a power transmission device through a high-voltage power distribution short-circuiting device;
the screw machine comprises a screw machine body provided with a steam channel, wherein the steam channel is provided with a steam inlet and a steam outlet, the steam inlet is connected with a steam pipeline, a pneumatic stop valve is arranged at the steam inlet, the steam outlet is connected with a closed evaporative cooler through a steam outlet pipeline, a condensed water outlet and an exhaust port are arranged on the closed evaporative cooler, the condensed water outlet of the closed evaporative cooler is connected with a liquid storage device, and the exhaust port of the closed evaporative cooler is connected with a vacuum pump.
2. The continuous casting and direct rolling heat preservation screw power generation system according to claim 1, wherein the power generation heat absorption module is formed by arranging heat conduction copper pipes with the diameter of 20mm side by side into square covers, the heat conduction copper pipes are connected end to end, one end part of two heat conduction copper pipes at the outermost layer is provided with a heat conduction oil inlet, and the other end part of the two heat conduction copper pipes at the outermost layer is provided with a heat conduction oil outlet.
3. The continuous casting and direct rolling heat preservation screw power generation system according to claim 1 or 2, wherein the heat conduction oil heat accumulator is provided with a horizontal heat accumulation tank, a safety valve, a steam discharge pipeline valve group, a heat accumulator water supplementing pipeline valve group, a pressure gauge and a blow-down valve are arranged on the horizontal heat accumulation tank, the heat accumulator water supplementing pipeline valve group is connected with a water tank through a water supplementing pipeline, a heat conduction oil internal circulation pipeline is arranged in the horizontal heat accumulation tank, one end of the heat conduction oil internal circulation pipeline is connected with a heat conduction copper pipe of a heat absorption housing through a heat conduction oil pipeline, the other end of the heat conduction oil internal circulation pipeline is connected with an oil tank, and the steam discharge pipeline valve group is connected with a closed evaporative cooler.
4. The continuous casting and direct rolling heat preservation screw power generation system according to claim 1, wherein a plurality of grooves for increasing the heating area are formed in the inner wall of the heat absorption housing, and the grooves are formed along the axis of the heat conduction copper pipe.
5. The continuous casting and direct rolling heat preservation screw power generation system according to claim 1, wherein an oil inlet connected with a heat conduction oil internal circulation pipeline is arranged on the oil tank, a filter assembly is arranged at the oil inlet, the filter assembly comprises a filter shell arranged at the oil inlet of the oil tank and a filter screen coated outside the filter shell, a plurality of porous graphite balls are filled in the filter shell, the filter shell is connected with a pipe joint arranged at the oil inlet through a quick connector, and a plurality of oil holes are formed in the filter shell.
6. The continuous casting and direct rolling heat preservation screw power generation system according to claim 1, wherein three closed type evaporative coolers are arranged and are connected in sequence.
7. The continuous casting and direct rolling heat preservation screw power generation method is characterized in that the continuous casting and direct rolling heat preservation screw power generation system is adopted to realize power generation, a heat absorption cover shell is covered on a high-temperature steel billet of a continuous casting machine, nonflammable heat conduction oil is used in the heat absorption cover shell, the pressure in a heat conduction copper pipe is controlled to be 0.05-0.15MPa under the action of a heat conduction circulating oil pump, the heat conduction oil is heated to 200-400 ℃ through the steel billet, the heat conduction oil enters a heat conduction oil heat accumulator through the heat conduction copper pipe, water in the heat conduction oil heat accumulator is heated, a large amount of steam is generated by the water, the steam pushes a screw power generator set through a steam pipeline, and the screw power generator set is started.
8. The continuous casting and direct rolling heat preservation screw generating method according to claim 7, wherein the screw generator set generates electricity in the following steps,
before the screw generator set rotates, the heat conducting oil heat accumulator discharges steam into the steam pipeline to raise the pressure in the steam pipeline to 0.1MPA gradually, and the computer picture is displayed and interlocked through the pressure transmitter; simultaneously, starting a vacuum pump, vacuumizing a steam channel in the closed evaporative cooler and the screw machine body, and controlling the vacuum degree of the steam channel of the closed evaporative cooler and the vacuum degree of the steam channel of the screw machine body to be-70 kPa-90 kPa; when the pressure in the steam pipeline reaches 0.2MPA, a pneumatic stop valve on the screw machine is opened, the opening of the pneumatic stop valve is gradually opened, and steam enters the screw machine from the heat conduction oil heat accumulator to realize power generation of a generator; when the pressure in the steam pipeline exceeds 0.3MPA, the heat conduction oil heat accumulator is exhausted, so that the pressure in the steam pipeline is always kept between 0.2MPA and 0.3MPA.
9. The method for generating electricity by continuous casting and direct rolling heat preservation screw rod according to claim 8, wherein the opening control method of the pneumatic stop valve is characterized in that firstly, the opening of the pneumatic stop valve is controlled to be 10% -40%, the screw rod machine starts to operate, the rotating speed reaches 1200-3000 revolutions, the rotating speed is transmitted to the generator, the generator is rotated, and at the moment, the generating power is 0 because the rotating speed of the generator is less than 1200 revolutions; continuously opening the pneumatic stop valve, when the opening gradually increases to 100%, the rotating speed of the screw machine is increased from 3000 to 5000, the rotating speed of the generator gradually increases through the speed reducer, when the rotating speed of the generator is increased to 1200, the generator is always in a power consumption state, and when the rotating speed of the generator set is greater than or equal to 1200, the generator starts to generate electricity; when the rotating speed of the screw machine reaches more than 5000 revolutions, the generator transmits 10KV voltage through a high-voltage distribution short-circuiting device.
10. The method for generating electricity by continuous casting and direct rolling heat preservation screw according to claim 8, wherein the heat conduction oil is alkylbenzene type heat conduction oil, alkyl naphthalene type heat conduction oil, biphenyl ether heat conduction oil or alkyl biphenyl ether type heat conduction oil.
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