CN111272000A - Slab vaporization cooling device and slab sensible heat recovery power generation system - Google Patents
Slab vaporization cooling device and slab sensible heat recovery power generation system Download PDFInfo
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- CN111272000A CN111272000A CN202010072496.9A CN202010072496A CN111272000A CN 111272000 A CN111272000 A CN 111272000A CN 202010072496 A CN202010072496 A CN 202010072496A CN 111272000 A CN111272000 A CN 111272000A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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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
- 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
- F22B1/04—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 slag, hot residues, or heated blocks, e.g. iron blocks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0061—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for phase-change applications
- F28D2021/0064—Vaporizers, e.g. evaporators
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Abstract
The invention relates to a slab vaporization cooling device and a slab sensible heat recovery power generation system, wherein the vaporization cooling device comprises four sides of heat-insulating walls and a heat-insulating upper cover, a slab stacking area is enclosed by the four sides of the heat-insulating walls, an anti-collision frame is arranged between the slab stacking area and the heat-insulating walls, a vaporization cooler surrounding the slab stacking area is arranged between the inner side of the heat-insulating walls and the anti-collision frame, a descending pipe of the vaporization cooler is arranged at the lower part of the inner side of the heat-insulating walls and used for providing a cooling medium, an ascending pipe of the vaporization cooler is arranged at the upper part of the inner side of the heat-insulating walls and used for outputting steam, the ascending pipe and the descending pipe are communicated through a plurality of heat exchange pipes, broken stones are laid at the bottom of the. The slab sensible heat recovery power generation system utilizing the slab evaporative cooling device comprises the evaporative cooling device for slab cooling sensible heat, a steam drum tank, a waste heat power generation system, a demineralized water tank and a thermal deaerator, and realizes the cyclic recovery power generation of the slab sensible heat.
Description
Technical Field
The invention relates to the technical field of heat recovery, in particular to a slab vaporization cooling device and a slab sensible heat recovery power generation system.
Background
In the process of producing steel plates or steel coils by steel companies, the energy conversion to 720KW is required for producing one ton of steel by steel making, and about 46.5% of the 385KW is transferred to the molten steel. The steel melt is solidified into a slab by a continuous casting machine, the continuously cast slab is cut into a fixed-length slab by a cutting machine, the slab with direct hot delivery or hot charging hot delivery is delivered to the next process by a delivery roll, the slab is rolled into a steel plate or a steel coil by a rolling mill, the steel billet without direct hot delivery or hot charging hot delivery condition needs to be stored in a slab yard for cold storage, the steel billet can be delivered to the rolling mill for the next process after being naturally cooled, and the time of more than three days is usually needed for waiting for the natural cooling of the steel billet, so the continuous casting workshops of a steel plant are all provided with thousands of square meters of the slab yard.
The slabs stored in the stacks are naturally cooled in the air for more than three days, the temperature of the slabs at the tail end outlet of the continuous casting machine generally reaches more than 800 ℃, the temperature of the slabs hung to the stacks by a crown block is still about 750 ℃, and the slab amount generated by at least one hearth can be stored in one stack, so that a large amount of slabs are obviously wasted in the natural cooling process of the slabs. Moreover, the slab is naturally cooled in the air, the cooling speed is not uniform, the cooling speed of the top slab and the cooling speed of the two sides and the two ends of the slab are high, the cooling speed of the middle slab and the center position of the slab is low, and the non-uniform cooling speed easily causes the micro-crack of the slab to be enlarged, thereby influencing the quality of the slab. In the actual production of steel billets, because the variety and specification are frequently changed and the batch rolling quantity is often very small, direct hot charging is impossible, even if hot-rolled coil plates are produced, because some special products, such as automobile steel, are required to clean the surfaces of the steel billets and then can be sent into a heating furnace to be reheated and then rolled, particularly in steel mills mainly producing medium-thickness steel plates and automobile steel plates, most of the steel billets need to be cooled in a stack before being sent into the heating furnace to be reheated and then rolled. Steel mills producing these products often have millions of tons of scale per year, and billions of slabs are stored in stacks for natural cooling in the country, so that a sensible heat recovery system is urgently needed to recover and utilize huge sensible heat in the slab stacking cooling process.
Disclosure of Invention
The invention aims to provide a slab vaporization cooling device and a slab sensible heat recovery power generation system aiming at the defects of the prior art, which can accelerate the cooling speed of a slab, ensure the cooling of the slab to be more uniform, ensure the quality of the slab, recover the sensible heat of the slab, generate power by utilizing the recovered slab sensible heat and play a role in energy conservation.
The technical scheme of the invention is as follows: a slab vaporization cooling device comprises heat insulation walls on four sides and a heat insulation upper cover, wherein a slab stacking area is formed by enclosing the heat insulation walls on the four sides, an anti-collision frame is arranged between the slab stacking area and the heat insulation walls, a vaporization cooler surrounding the slab stacking area is arranged between the inner side of the heat insulation wall and the anti-collision frame, a descending pipe of the vaporization cooler is arranged on the lower portion of the inner side of the heat insulation wall and used for providing a cooling medium, an ascending pipe of the vaporization cooler is arranged on the upper portion of the inner side of the heat insulation wall and used for outputting steam, the ascending pipe and the descending pipe are communicated through a plurality of heat exchange pipes, broken stones are laid at the bottom of the slab stacking area, a asbestos layer is arranged on the upper end face of the broken stones, and a.
The heat preservation wall is arranged on a base platform surrounding the broken stone.
The heat exchange tube adopts a finned tube.
The utility model provides an utilize slab vaporization cooling device's slab sensible heat recovery power generation system, is including vaporization cooling device, steam pocket jar, waste heat power generation system, demineralized water tank, thermal deaerator that is arranged in slab cooling sensible heat, the tedge and the steam pocket jar upper portion of vaporization cooling device are connected among the vaporization cooling device, and the steam output pipe of steam pocket jar upper end is connected with the heating power box of waste heat power generation system, the low reaches end of heating power box is connected through the steam input end of pipeline with waste heat power generation system's steam turbine, the steam turbine is connected transmission power through pivot and a generator, and the exhaust steam output end of steam turbine is connected with the upstream end of an exhaust steam condenser, the low reaches end of exhaust steam condenser is through the upstream end of condensate water pump connection demineralized water tank, the low reaches end of demineralized water tank is through the upstream end of a demineralized water pump connection thermal deaerator, the low reaches end of thermal deaerator is through pipe connection steam pocket jar, the lower part of the steam drum tank is connected with a downcomer of the vaporization cooler, and the steam output pipe is connected with the thermal deaerator through a manifold, so that the circulating recovery power generation of the sensible heat of the plate blank is realized.
The ascending pipe is provided with a first switch valve, two ends of the first switch valve are connected with a first bypass valve in parallel, the descending pipe is provided with a second switch valve, and two ends of the second switch valve are connected with a second bypass valve in parallel.
And the first switch valve and the second switch valve are both electric bell jar valves.
The manifold is provided with a first stop valve, and the diameter of the manifold is smaller than that of the steam output pipe.
The demineralized water tank is connected with the outside through a demineralized water replenishing pipe for replenishing water.
And a second stop valve is arranged on the demineralized water replenishing pipe.
Adopt above-mentioned technical scheme: and the heat-insulating walls on four sides of the evaporative cooling device enclose a slab stacking area, the slab stacking area is used for storing high-heat slabs off-line from the continuous casting machine, and an evaporative cooler surrounding the slab stacking area is arranged between the inner side of the heat-insulating wall and the anti-collision frame and used for cooling the high-heat slabs in the slab stacking area. The down pipe of the vaporization cooler is arranged at the lower part of the inner side of the heat-insulating wall, so that the cooling medium can flow into the vaporization cooler through the down pipe, the ascending pipe of the vaporization cooler is arranged at the upper part of the inner side of the heat-insulating wall, the ascending pipe and the down pipe are communicated by a plurality of heat exchange pipes, the cooling medium provided by the down pipe is evaporated under the high-temperature action of a high-heat slab, a large amount of generated steam can enter the ascending pipe along the heat exchange pipes, and the generated steam is output through the ascending pipe. Moreover, as the cooling medium is continuously fed into the evaporative cooler through the downcomer, the pressure of the cooling medium in the downcomer is greater than the pressure of the steam in the riser, so that the cooling medium in the downcomer enters the heat exchange tubes, and the cooling medium entering the heat exchange tubes and the cooling medium in the downcomer simultaneously cool the high heat slabs stacked in the slab stacking zone. The anti-collision frame is arranged between the slab stacking area and the heat preservation wall, when the high-heat slab is hoisted into the slab stacking area, the anti-collision frame can avoid collision between the high-heat slab and the heat exchange pipe, the ascending pipe and the descending pipe, and damage to the vaporization cooler when the high-heat slab is placed is prevented. The heat-insulating wall and the heat-insulating upper cover of the vaporization cooling device can be used for insulating the high-heat plate blank, so that the heat of the high-heat plate blank can be completely exchanged with the cooling medium in the vaporization cooler. Utilize this vaporization cooling device can accelerate the cooling rate of high fever slab through coolant, greatly shortened the refrigerated required time of high fever slab, high fever slab all is provided with hot exchange pipe all around simultaneously, can make high fever slab uniform cooling, avoids high fever slab to influence the quality because of the cooling inequality.
The heat preservation wall sets up on the base station of encircleing the rubble, avoids the direct and ground contact of vaporization cooling device, plays the effect of protection ground.
The heat exchange tube adopts a finned tube, and the finned tube type heat exchange tube can increase the heating surface of the heat exchange tube, so that the heat transfer efficiency of the heat exchange tube is accelerated.
An ascending pipe of the vaporization cooler is connected with the upper part of the steam drum tank, so that steam in the vaporization cooler is conveyed into the steam drum tank through the ascending pipe, a steam output pipe at the upper end of the steam drum tank is connected with a heating power tank of the waste heat power generation system, the steam in the steam drum tank is transmitted to the heating power tank through a steam output pipe, and the steam output from the steam drum tank is converted into superheated steam through the heating power tank. The downstream end of the heat distribution box is connected with the steam input end of a steam turbine of the waste heat power generation system through a pipeline, so that superheated steam generated by the heat distribution box provides operation power for the steam turbine, the steam turbine is connected with a generator through a rotating shaft, and the rotating shaft of the steam turbine driven by the superheated steam rotates to drive the generator to operate and generate power. The waste steam output end of the steam turbine is connected with the upstream end of the waste steam condenser, superheated steam provides kinetic energy for the steam turbine and then is converted into waste steam, and the waste steam losing thermal potential energy is conveyed into the waste steam condenser from the waste steam output end of the steam turbine, so that the waste steam is condensed into water in the waste steam condenser. The low reaches end of exhaust steam condenser connects the upper reaches end of demineralized water case through the condensate pump, makes the exhaust steam condensate water carry to the demineralized water case by the condensate pump, the low reaches end of demineralized water case connects the upper reaches end of heating power oxygen-eliminating device through the demineralized water pump, and the steam output tube passes through the manifold and is connected with the heating power oxygen-eliminating device, and the exhaust steam condensate water carries the heating power oxygen-eliminating device from the demineralized water case in, carries out the deoxidization to the exhaust steam condensate water by the steam in the steam output tube, prevents pipeline and the equipment in the dissolved oxygen corrosion system in the exhaust steam condensate water. The pipeline at the lower end of the steam drum tank is connected with the downstream end of the thermal deaerator, deaerated exhaust steam condensate is conveyed into the steam drum tank through the pipeline, a descending pipe of the vaporization cooler is connected with the lower part of the steam drum tank, cooling water subjected to water-vapor separation by the steam drum tank returns to the vaporization cooler through the descending pipe to cool a high-heat plate blank in the plate blank stacking area, the cooling water is evaporated under the action of the high-heat plate blank to generate steam, and the generated steam is conveyed into the steam drum tank through the ascending pipe. Thereby continuously realizing the cyclic high-heat slab sensible heat recovery power generation.
The ascending pipe is provided with a first switch valve, two ends of the first switch valve are connected with a first bypass valve in parallel, the descending pipe is provided with a second switch valve, and two ends of the second switch valve are connected with a second bypass valve in parallel. Through setting up first ooff valve and second ooff valve, be convenient for open or stop the vaporization cooling device, before opening the vaporization cooling device, make the pressure-sharing around first ooff valve, the second ooff valve through opening first bypass valve, second bypass valve earlier, guarantee whole slab sensible heat recovery power generation system's safe operation.
The first switch valve and the second switch valve are both electric bell jar valves which can be automatically controlled, so that the slab sensible heat recovery power generation system can be opened and closed more conveniently.
Be equipped with first stop valve on the manifold, and the diameter of manifold is less than the diameter of steam output pipe, makes most steam in the steam output pipe deliver for the drive power of heating power case as the steam turbine, and a small amount of steam is carried and is carried the deoxidization to the exhaust steam condensate water in the thermal deaerator, moreover, can control the steam transport in the thermal deaerator through first stop valve.
The demineralized water tank is connected with external water through a demineralized water replenishing pipe, and the demineralized water connected with the external demineralized water through the demineralized water replenishing pipe can replenish the loss part in the system, so that enough cooling water can be ensured to cool the high-heat plate blank.
The demineralized water moisturizing pipe is provided with a second stop valve, and the replenishment quantity of external demineralized water to the system can be controlled by controlling the opening or closing of the second stop valve according to the requirements of actual conditions.
The invention is further described with reference to the drawings and the specific embodiments in the following description.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a schematic structural view of the evaporative cooling apparatus of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a cross-sectional view B-B of FIG. 2;
FIG. 5 is a schematic view of the connection of a heat exchange tube of the present invention to a downcomer;
fig. 6 is a schematic view of fig. 5 in direction C.
In the attached drawing, 1 is a heat preservation wall, 2 is a heat preservation upper cover, 2-1 is a hoisting support, 3 is a slab stacking area, 4 is an anti-collision frame, 5 is a vaporization cooler, 6 is a descending pipe, 7 is an ascending pipe, 8 is a heat exchange pipe, 9 is broken stone, 10 is asbestos, 11 is a base station, 12 is a vaporization cooling device, 13 is a steam drum, 14 is a waste heat power generation system, 14-1 is a heat power box, 14-2 is a steam turbine, 14-3 is a generator, 14-4 is an exhaust steam condenser, 15 is a demineralized water box, 16 is a thermal deaerator, 17 is a steam output pipe, 18 is a condensate water pump, 19 is a demineralized water pump, 20 is a pipeline, 21 is a manifold, 21-1 is a first stop valve, 22 is a demineralized water replenishing pipe, 22-1 is a second stop valve, and 23 is a concrete foundation.
Detailed Description
Referring to fig. 1 to 6, the slab vaporization cooling device comprises a heat preservation wall 1 and a heat preservation upper cover 2 on four sides, wherein the heat preservation wall 1 can be made of heat preservation bricks, heat preservation materials are coated outside the heat preservation bricks, then asbestos felt is wrapped outside the heat preservation materials, the heat preservation upper cover 2 can achieve the heat preservation effect by pouring spinel heat preservation materials, and angle steel is arranged on the heat preservation upper cover 2 to increase the strength. A slab stacking area 3 is defined by the heat-insulating walls 1 on four sides, and the slab stacking area 3 is used for storing high-heat slabs off-line from a continuous casting machine. An anti-collision frame 4 is arranged between the slab stacking area 3 and the heat preservation wall 1, a vaporization cooler 5 surrounding the slab stacking area 3 is arranged between the inner side of the heat preservation wall 1 and the anti-collision frame 4, and high-heat slabs in the slab stacking area 3 are cooled through the vaporization cooler 5. The anti-collision frame 4 is formed by welding beam columns by using section steel, can be welded by using I-shaped steel or channel steel or angle steel, can exchange heat through the space between the beam columns between the slab stacking area 3 and the evaporative cooler 5, and can prevent the high-heat slab from colliding with the evaporative cooler 5 when the high-heat slab is hoisted into the slab stacking area 3, thereby protecting the evaporative cooler 5. The lower pipe 6 of the vaporization cooler 5 is arranged at the lower part of the inner side of the heat preservation wall 1 and used for providing cooling medium, the ascending pipe 7 of the vaporization cooler 5 is arranged at the upper part of the inner side of the heat preservation wall 1 and used for outputting steam, the ascending pipe 7 is communicated with the lower pipe 6 through a plurality of heat exchange pipes 8, high-heat plate blanks in the plate blank stacking area 3 are cooled through the cooling medium provided by the descending pipe 6, the cooling medium is evaporated under the high-temperature action of the high-heat plate blanks, and the generated steam can enter the ascending pipe 7 through the heat exchange pipes 8 and is discharged through the ascending pipe 7. The heat exchange tube 8 adopts a fin tube, and the fin tube type heat exchange tube 8 can increase the heating surface of the heat exchange tube 8, so that the heat transfer efficiency of the heat exchange tube 8 is improved. Moreover, as the cooling medium is continuously fed into the evaporative cooler 5 through the downcomer 6, the pressure of the cooling medium in the downcomer 6 is higher than the pressure of the steam in the riser 7, and therefore the cooling medium in the downcomer 6 enters the heat exchange tubes 8, and the cooling medium entering the heat exchange tubes 8 and the cooling medium in the downcomer 6 simultaneously cool the high heat slabs stacked in the slab stacking zone 3, so that the cooling area of the high heat slabs can be increased. Broken stone 9 is laid to the bottom in slab stack district 3, and 9 up ends of broken stone set up the asbestos 10 layer, and this broken stone 9 is laid on concrete foundation 23, avoids high fever slab direct and concrete foundation 23 contact, prevents that high fever slab from haring concrete foundation 23, and the asbestos 10 that 9 up ends of broken stone set up can increase the stationarity of placing high fever slab, sets up the asbestos 10 layer moreover and can avoid high fever slab and broken stone 9 friction to influence the quality of slab. The lower end of the heat preservation wall 1 is provided with a base 11 surrounding the broken stone 9, so that the vaporization cooling device is prevented from directly contacting the concrete foundation 23, and the effect of protecting the concrete foundation 23 is achieved. The heat-insulating upper cover 2 is provided with the hoisting support 2-1, so that the heat-insulating upper cover 2 can be opened or covered conveniently, and the operation of workers is facilitated.
A slab sensible heat recovery power generation system utilizing a slab evaporative cooling device comprises the evaporative cooling device 12 for high-heat slab cooling sensible heat, a steam drum tank 13, a waste heat power generation system 14, a demineralized water tank 15 and a thermal deaerator 16. The ascending pipe 7 of the vaporization cooler 5 in the vaporization cooling device 12 is connected with the upper part of the steam pocket tank 13, the vaporization cooler 5 cools the high-heat slab in the slab stacking area 3 through cooling water, the cooling water is evaporated under the high-temperature action of the high-heat slab in the cooling process, steam generated in the vaporization cooler 5 is conveyed into the steam pocket tank 13 through the ascending pipe 7, a steam output pipe 17 at the upper end of the steam pocket tank 13 is connected with a heat power box 14-1 of the waste heat power generation system 14, the steam in the steam pocket tank 13 is transmitted to the heat power box 14-1 through the steam output pipe 17, the steam output from the steam pocket tank 13 can be converted into superheated steam through the heat power box 14-1, and the heat power box 14-1 can adopt a micro-superheat heat accumulator, so that the superheated steam is continuously generated. The downstream end of the thermal power box 14-1 is connected with the steam input end of a steam turbine 14-2 of the waste heat power generation system 14 through a pipeline, the steam turbine 14-2 is connected with a power generator 14-3 through a rotating shaft to transmit power, superheated steam output by the thermal power box 14-1 drives the steam turbine 14-2 to operate, and the steam turbine 14-2 drives the power generator 14-3 to operate and generate power through rotation of the rotating shaft. The exhaust steam output end of the steam turbine 14-2 is connected with the upstream end of an exhaust steam condenser 14-4, superheated steam provides kinetic energy for the steam turbine 14-2 and then is converted into exhaust steam, and exhaust steam losing thermal potential energy is conveyed into the exhaust steam condenser 14-4 from the exhaust steam output end of the steam turbine 14-2, so that the exhaust steam is condensed into water in the exhaust steam condenser 14-4. The utility model discloses a heating power deaerator, including the steam output pipe 17, the steam output pipe 17 is connected with heating power deaerator 16 through a manifold 21, and the steam condensate carries the heating power deaerator 16 from desalting water tank 15 to the heating power deaerator 16, carries out the deoxidization to the steam condensate in the steam output pipe 17, prevents that the dissolved oxygen in the steam condensate from corroding the pipeline and the equipment of system, guarantees the life of pipeline and equipment, makes the steam condensate carry for desalting water tank 15 by the upstream end that desalting water pump 18 connects desalting water tank 15, desalting water tank 15's downstream end is connected the upstream end of heating power deaerator 16 through a desalting water pump 19, be connected with heating power deaerator 16 on the steam output pipe 17 through a manifold 21, and the steam condensate carries out the deoxidization to the steam. The manifold 21 is provided with a first stop valve 21-1, and the diameter of the manifold 21 is smaller than that of the steam output pipe 17, so that most of steam in the steam output pipe 17 is transmitted to the heat power box 14-1 as driving power of the steam turbine 14-2, a small amount of steam is transmitted to the thermal deaerator 16 to deaerate dead steam condensate, and the transmission amount of the steam in the thermal deaerator 16 can be controlled by opening or closing the first stop valve 21-1 according to the requirements of actual conditions. The demineralized water tank 15 is connected with external water through a demineralized water replenishing pipe 22, and the demineralized water connected with the external demineralized water through the demineralized water replenishing pipe 22 can replenish the lost cooling water part in the system, so that enough cooling water can be ensured to cool the high-heat plate blank. The second stop valve 22-1 is arranged on the demineralized water replenishing pipe 22, the replenishing quantity of external demineralized water to the system can be controlled by controlling the opening or closing of the second stop valve 22-1 according to the requirements of actual conditions, the phenomenon that excessive replenishing water overflows from the steam drum tank 13 is prevented, and the phenomenon that the cooling effect and the power generation effect of a high-temperature slab are influenced due to too little cooling water in the system is prevented. The pipeline 20 at the lower end of the steam drum tank 13 is connected with the downstream end of the thermal deaerator 16, deaerated exhaust steam condensate water is conveyed into the steam drum tank 13 through the pipeline 20, the downcomer 6 of the vaporization cooler 5 is connected with the lower part of the steam drum tank 13, water-vapor separation can be realized through the steam drum tank 13, cooling water subjected to water-vapor separation returns to the vaporization cooler 5 through the downcomer 6 to cool a high-heat slab in the slab stacking area 3, the cooling water is evaporated under the high-temperature action of the high-heat slab to generate steam, the generated steam is conveyed into the steam drum tank 13 through the riser 7, circulating power is formed through the gravity difference between the cooling water in the downcomer 6 and a water-vapor mixture in the riser 7, and the system continuously realizes circulating recovery power generation of sensible heat of the slab.
The ascending pipe 7 is provided with a first switch valve 7-1, two ends of the first switch valve 7-1 are connected with a first bypass valve 7-2 in parallel, the descending pipe 6 is provided with a second switch valve 6-1, and two ends of the second switch valve 6-1 are connected with a second bypass valve 6-2 in parallel. The evaporative cooling device 12 is convenient to start or stop by arranging the first switch valve 7-1 and the second switch valve 6-1, before the evaporative cooling device 12 is started, the first bypass valve 7-2 and the second bypass valve 6-2 are opened to enable the front and the back of the first switch valve 7-1 and the second switch valve 6-1 to be pressure-equalized, and the safe and stable operation of the whole slab sensible heat recovery power generation system is ensured. The first switch valve 7-1 and the second switch valve 6-1 both adopt electric bell jar valves, and the electric bell jar valves can be automatically controlled by a computer, so that the opening and closing of the slab sensible heat recovery power generation system are more convenient and intelligent. In addition, the system can be provided with corresponding on-line detectors on the evaporative cooler 5, the ascending pipe 7, the drum tank 13, the heat box 14-1, the desalted water tank 15, the thermal deaerator 16 and the descending pipe 6, for example, a temperature detector may be provided on the evaporative cooler 5, and when the temperature detector detects that the temperature of the evaporative cooler 5 is greater than a set temperature, namely, the first switch valve 7-1 and the second switch valve 6-1 are automatically controlled to be opened by a computer, the sensible heat of the plate blank is recovered to generate electricity until the temperature detector detects that the temperature of the evaporative cooler 5 is lower than the set temperature, and hoisting the cooled slabs from the slab stacking area 3 block by block, and automatically controlling the first switch valve 7-1 and the second switch valve 6-1 to be closed through a computer, thereby realizing the automatic opening or closing of the system.
When the slab sensible heat recovery power generation system is used, after the overhead travelling crane removes the heat-insulating upper cover 2, the high-heat slabs off-line from the continuous casting machine are hoisted into the slab stacking area 3 block by block, the first bypass valve 7-2 and the second bypass valve 6-2 are opened to enable the first switch valve 7-1 and the second switch valve 6-1 to equalize pressure front and back, then the first switch valve 7-1 and the second switch valve 6-1 are opened, the first bypass valve 7-2 and the second bypass valve 6-2 are closed, the vaporization cooler 5 detects that the temperature is higher than 750 ℃, heat exchange with the high-heat slabs is started to cool the high-heat slabs, after the slab stacking is finished, the heat-insulating upper cover 2 covers the vaporization cooling device 12, namely, the high-heat full-load slab sensible heat recovery is started, and the cooling water in the vaporization cooler 5 is heated and vaporized, steam enters an ascending pipe 7, and forms circulating power by means of the gravity difference between cooling water in a descending pipe 6 and a water-steam mixture in the ascending pipe 7, so that the steam in the ascending pipe 7 is continuously transmitted to a waste heat power generation system 14, the circulation is faster when the heat intensity in a pipeline is higher, exhaust steam after driving a steam turbine 14-2 is converted into cooling water capable of being used for cooling a high-heat slab through an exhaust steam condenser 14-4, a desalting water tank 15 and a thermal deaerator 16, the cooling water is subjected to water-steam separation through a steam pocket tank 13 and returns to a vaporization cooler 5 through the descending pipe 6 to cool the high-heat slab, when the vaporization cooler 5 detects that the temperature of the slab stacking area 3 is reduced to 200 ℃, a heat-insulating upper cover 2 is lifted by an overhead crane and lifted out of the slab from the slab stacking area 3, and then the high-heat slab off a continuous casting machine is lifted into the slab stacking area 3 again, the continuous sensible heat recovery power generation of the floor blank is realized through the circulation.
The energy-saving and emission-reducing effects of the slab sensible heat recovery power generation system are calculated as follows
1) Energy saving effect
Setting energy-saving calculation conditions:
recovering the sensible heat temperature interval of the plate blank: 700-250 ℃ (minimum to 200 ℃); average heat capacity of the slab in the temperature interval: (0.9479+0.5250)/2 ═ 0.7364KJ/kg. ℃; the thermal efficiency of the recovery system is set to 75%; saturated steam pressure is 1.3MPa, temperature is 190 ℃, and saturated steam enthalpy is 2786 KJ/kg.
(1) The recoverable heat per ton of slab:
0.7364*(700-250)*1000*0.75＝248535KJ/t
(2) the recovered heat can produce saturated steam:
248535/2786＝89.2kg/t
(3) calculating the power generation amount by generating one-degree electricity per 7kg of saturated steam:
89.2/7＝12.7KW.h/t
(4) converting standard coal: (the index coefficient is 0.32kgce/KW.h)
12.7*0.32＝4.064kgce/t
Therefore, the energy saving value is 4.064kgce when sensible heat of each ton of plate blank is recovered for power generation.
2) Emission reduction effect calculation
Compared with coal-fired power generation, the energy saving and emission reduction values are shown in table 1:
TABLE 1
Note: the coal electric signature coefficient is 0.32kgce/KW.h
The evaporative cooling device can accelerate the cooling speed of the high-heat plate blank through the cooling medium, greatly shortens the cooling time of the high-heat plate blank compared with the prior art that only the off-line high-heat plate blank of a continuous casting machine can be naturally cooled, and meanwhile, the four sides of the plate blank stacking area 3 are provided with the heat exchange tubes 8, so that the high-heat plate blank can be uniformly cooled, cracks and the like caused by uneven cooling of the high-heat plate blank are avoided, and the quality of the plate blank is ensured. Moreover, the device adopts the heat-insulating wall 1 and the heat-insulating upper cover 2, so that the heat of the high-heat plate blank can be completely exchanged with the cooling medium in the vaporization cooler 5, the heat of the high-heat plate blank is prevented from being dissipated in the external environment, and the heat is stored for the subsequent recovery and utilization of the sensible heat of the plate blank.
According to the slab sensible heat recovery power generation system, the sensible heat of the slab is recovered and generated by utilizing the heat generated when the high-heat slab is cooled by the vaporization cooling device 12, so that the dual effects of saving energy and ensuring the quality of the slab are achieved. Moreover, a plurality of connectors are arranged on the steam drum tank 13 and are respectively connected with the ascending pipes 7 and the descending pipes 6 of the plurality of vaporization and vaporization cooling devices 12, so that the power generation amount of the waste heat power generation system 14 is increased.
Claims (9)
1. A plate blank vaporization cooling device is characterized in that: the vaporization cooling device comprises heat-insulating walls (1) and heat-insulating upper covers (2) on four sides, a slab stacking area (3) is enclosed by the heat-insulating walls (1) on four sides, an anti-collision frame (4) is arranged between the slab stacking area (3) and the heat-insulating walls (1), a vaporization cooler (5) surrounding the slab stacking area (3) is arranged between the inner side of the heat-insulating walls (1) and the anti-collision frame (4), a descending pipe (6) of the vaporization cooler (5) is arranged at the lower part of the inner side of the heat-insulating walls (1) and used for providing a cooling medium, an ascending pipe (7) of the vaporization cooler (5) is arranged at the upper part of the inner side of the heat-insulating walls (1) and used for outputting steam, the ascending pipe (7) is communicated with the descending pipe (6) through a plurality of heat-exchanging pipes (8), broken stones (9) are laid at the bottom of the slab stacking area (3), and a hoisting bracket (2-1) is arranged on the heat-insulating upper cover (2).
2. The evaporative cooling tank of claim 1, wherein: the heat-insulating wall (1) is arranged on a base platform (11) surrounding the broken stone (9).
3. Slab sensible heat recovery system according to claim 1, characterized in that: the heat exchange tube (8) adopts a fin tube.
4. The utility model provides an utilize slab sensible heat recovery power generation system of slab vaporization cooling device which characterized in that: the system comprises a vaporization cooling device (12) used for sensible heat of slab cooling, a steam pocket tank (13), a waste heat power generation system (14), a desalted water tank (15) and a thermal deaerator (16), wherein an ascending pipe (7) of a vaporization cooler (5) in the vaporization cooling device (12) is connected with the upper part of the steam pocket tank (13), a steam output pipe (17) at the upper end of the steam pocket tank (13) is connected with a thermal power box (14-1) of the waste heat power generation system (14), the downstream end of the thermal power box (14-1) is connected with the steam input end of a steam turbine (14-2) of the waste heat power generation system (14) through a pipeline, the steam turbine (14-2) is connected with a generator (14-3) through a rotating shaft to transmit power, and the exhaust steam output end of the steam turbine (14-2) is connected with the upstream end of an exhaust steam condenser (14, the utility model discloses a steam boiler, including exhaust steam condenser (14-4), the low reaches end of desalting water tank (15) is connected through condensate pump (18) to the low reaches end of exhausting steam condenser (14-4), the low reaches end of desalting water tank (15) is through the upper reaches end that a desalting water pump (19) is connected heating power oxygen-eliminating device (16), the low reaches end of heating power oxygen-eliminating device (16) passes through pipeline (20) and connects steam pocket jar (13), downcomer (6) of sub-unit connection vaporizer cooler (5) of steam pocket jar (13), steam output pipe (17) are connected with heating power oxygen-eliminating device (16) through a manifold (21), realize the circulation recovery electricity generation of slab sensible heat.
5. The slab sensible heat recovery power generation system using a slab evaporative cooling apparatus according to claim 4, wherein: the ascending pipe (7) is provided with a first switch valve (7-1), two ends of the first switch valve (7-1) are connected with a first bypass valve (7-2) in parallel, the descending pipe (6) is provided with a second switch valve (6-1), and two ends of the second switch valve (6-1) are connected with a second bypass valve (6-2) in parallel.
6. The slab sensible heat recovery power generation system using a slab evaporative cooling apparatus according to claim 5, wherein: the first switch valve (7-1) and the second switch valve (6-1) are both electric bell jar valves.
7. The slab sensible heat recovery power generation system using a slab evaporative cooling apparatus according to claim 4, wherein: the manifold (21) is provided with a first stop valve (21-1), and the diameter of the manifold (21) is smaller than that of the steam output pipe (17).
8. The slab sensible heat recovery power generation system using a slab evaporative cooling apparatus according to claim 4, wherein: the demineralized water tank (15) is connected with the outside through a demineralized water replenishing pipe (22) for replenishing water.
9. The slab sensible heat recovery power generation system using a slab evaporative cooling apparatus according to claim 8, wherein: and a second stop valve (22-1) is arranged on the demineralized water replenishing pipe (22).
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