Blast furnace slag flushing water heat energy recovery device

Abstract

The invention discloses a blast furnace slag flushing water heat energy recovery device which comprises a hot water tank exchanging heat with blast furnace slag flushing water, an energy conversion unit and a rotating mechanism. The number of the energy conversion units is more than two, each energy conversion unit comprises a bottom water tank and a piston cylinder, a cylinder barrel of each piston cylinder is filled with a thermal expansion agent, the thermal expansion agent and the bottom water tank are arranged in a heat conduction mode, and a piston body of each piston cylinder extends to form a rack; the rotating mechanism comprises a rotating shaft and a gear, a non-return device is arranged between the gear and the rotating shaft, and the gear corresponds to the rack in a one-to-one mode and is meshed with the rack; the bottom water tank of each energy conversion unit communicates with the hot water tank, and a rotating shaft of the rotating mechanism is in transmission connection with the generator. Hot water in the hot water tank is fed into the bottom water tank in each energy conversion unit in turn, and the more than two energy conversion units work in turn to sequentially drive the rotating shaft to realize one-way, continuous and stable rotation of the rotating shaft, so that the recovery from heat energy to electric energy is completed by virtue of the work of the generator.

Description

Technical Field

[0001] The present invention relates to the technical field of energy recovery devices for steel smelting, and in particular to a blast furnace slag flushing water heat energy recovery device. Background Art

[0002] During the blast furnace ironmaking process, raw materials such as iron ore, coke, and limestone are added from the furnace roof. A complex series of physical and chemical reactions occur within the furnace, gradually reducing the iron ore to liquid pig iron and simultaneously generating slag. Due to the density difference between the liquid pig iron and slag, the slag accumulates at the bottom of the blast furnace, with the slag floating above the pig iron. When the slag accumulates to a certain amount, it is discharged through the blast furnace's slag outlet along the slag ditch and into the slag flushing area. The slag flushing system sprays a large amount of water to cool the molten slag, causing it to rapidly cool, break up, solidify, and granulate.

[0003] After long-term circulation, the temperature of blast furnace slag water can reach approximately 95°C, containing a rich source of thermal energy. However, this thermal energy is currently largely unutilized, resulting in energy waste and increased production energy consumption. Furthermore, the blast furnace slag water also releases a large amount of radiant heat. This high temperature increases the temperature of the dust hood in front of the furnace, which in turn causes the working environment temperature to frequently reach over 80°C. This has a very negative impact on the working conditions of on-site personnel, and in severe cases, may even threaten their health and life safety, greatly limiting the improvement of production efficiency and the normal operation of the work.

[0004] Traditional heat recovery methods are mainly divided into two categories: one is heat exchange, which transfers the heat energy in the slag water to other media through a heat exchanger, realizing heat-to-heat energy recovery. However, this method has a relatively narrow application range and limited recovery efficiency. The other is secondary heating through a boiler to generate high-pressure steam, which is used to drive the rotor to rotate, thereby realizing the recovery of heat energy into kinetic energy and even electrical energy. However, blast furnace slag water is mixed with a large amount of granulated solid slag. The presence of this solid slag can cause serious wear and blockage to equipment such as boilers, making it difficult for the boiler to directly reheat the blast furnace slag water. In addition, without additional thermal energy, relying solely on the existing thermal energy of the blast furnace slag water cannot achieve the effective temperature and pressure conditions required for boiler steam generation. As a result, the thermal energy of the blast furnace slag water is usually limited to recovery through heat exchange, which greatly limits its development and utilization in broader and more valuable application areas such as power generation. Summary of the Invention

[0005] The purpose of the present invention is to provide a blast furnace slag flushing water heat energy recovery device.

[0006] The technical solution for achieving the purpose of the present invention is: a blast furnace slag flushing water heat energy recovery device, including a hot water tank for heat exchange with blast furnace slag flushing water, and also including an energy conversion unit and a rotating mechanism; the number of the energy conversion units is two or more, each of the energy conversion units includes a bottom water tank and a piston cylinder, the bottom water tank is provided with a water inlet and a water outlet, the piston cylinder includes a cylinder barrel and a piston body, a heat conduction arrangement is provided between the cylinder barrel and the bottom water tank, a thermal expansion agent is contained in the cylinder barrel, the piston body extends into the cylinder barrel and fits with the inner wall of the cylinder barrel, the upper part of the piston body is provided with a rack extending outward and parallel to the length direction of the piston body, the rack is located Outside the cylinder; each of the rotating mechanisms includes a rotating shaft and a plurality of gears, the number of the gears in each rotating mechanism is the same as the number of the energy conversion units, the gears are coaxially mounted on the rotating shaft and are arranged and distributed along the axial direction of the rotating shaft, a check valve is provided between the gear and the rotating shaft, the check valve is a check valve that allows the rotating shaft to rotate in one direction only when the piston body is extended, each of the gears on the rotating shaft corresponds to and meshes with the rack on the piston body in each energy conversion unit; the water inlet of the bottom water tank of each energy conversion unit is connected to the hot water tank; the rotating shaft of the rotating mechanism is transmission-connected to the generator; During operation, the hot water in the hot water tank is fed into the bottom water tank in each of the energy conversion units in turn through the respective water inlets.

[0007] Furthermore, the bottom water tank has a mounting opening, through which the bottom of the cylinder barrel extends into the bottom water tank. During operation, the heat from the water in the bottom water tank is directly transferred to the cylinder barrel. The cylinder barrel can be mounted on the bottom water tank, and the heat from the water in the bottom water tank is transferred to the cylinder barrel through the bottom water tank. Alternatively, the bottom of the cylinder barrel can extend into the bottom water tank, and the heat from the water in the bottom water tank is directly transferred to the cylinder barrel. Compared to the former, the latter achieves less heat loss during heat conduction and higher thermal energy utilization.

[0008] Furthermore, the cylinder base is mounted on the bottom water tank and sealed with the mounting opening. This arrangement, on the one hand, achieves stable mounting of the piston cylinder; on the other hand, it achieves sealing of the bottom water tank, ensuring that the water in the bottom water tank does not overflow, and also prevents the heat of the water in the bottom water tank from escaping, thereby reducing energy loss.

[0009] Furthermore, the thermal expansion agent is a liquid with a high expansion coefficient, such as mercury, thermal conductive oil, or transformer oil.

[0010] Furthermore, the rack is located on the side of the cylinder, and a roller is rotatably mounted on the rack. The roller is located between the rack and the cylinder seat, and the wheel surface of the roller is tangent to the outer wall of the cylinder. During operation, the roller rolls as the piston body expands and contracts. The rack can be located above the cylinder or on the side of the cylinder. Compared with the former, when the rack is located on the side of the cylinder, the rack is opposite to the cylinder, and the roller tangent to the outer wall of the cylinder is rotatably mounted on the rack. The provision of the roller, on the one hand, can limit the position of the rack and the cylinder, making the movement of the rack more stable; on the other hand, during the movement, by forming rolling, the relative friction between the rack and the cylinder is reduced, making the relative movement between the rack and the cylinder smoother and less abrasive.

[0011] Furthermore, the anti-return device includes a sleeve and an inner gear sleeve, wherein the sleeve is coaxially sleeved on the rotating shaft, the gear is coaxially mounted on the inner gear sleeve, the inner gear sleeve is gap-mounted on the outside of the sleeve, the inner wall of the inner gear sleeve is circumferentially distributed with a plurality of serrations, and the sleeve is provided with an anti-return rod and a compression spring, wherein the first end of the anti-return rod is hingedly mounted on the sleeve and the second end is inserted between adjacent serrations, and the compression spring is located on the side of the anti-return rod away from the inner gear sleeve, one end of the compression spring contacts the sleeve and the other end contacts the anti-return rod. The anti-return device is a device in which the rotating shaft rotates with the rack and the gear when the piston body is extended, and the rotating shaft does not rotate with the rack and the gear when the piston body is retracted. During operation, the compression spring provides a force so that the check rod always pushes against the adjacent serrations. With the existence of the check rod, when the rack, the gear and the inner gear sleeve rotate in the extended state of the piston body, the serrations apply a force in the same direction as the compression spring to the check rod, thereby clamping the check rod and driving the sleeve and the rotating shaft to rotate together; when the rack, the gear and the inner gear sleeve rotate in the opposite direction, the serrations apply a force in the opposite direction of the compression spring to the check rod, and the compression spring is further compressed, and the check rod withdraws from the gap between the serrations. The rotating inner gear sleeve cannot drive the sleeve and the rotating shaft to rotate together, and the rotating shaft does not rotate, thereby achieving check. The structure of the check valve can be, but is not limited to, the aforementioned ratchet-type check valve. It can also be an overrunning clutch-type check valve. The structure of an overrunning clutch-type check valve is generally similar to that of a single clutch, consisting of inner and outer rings and rollers. The rollers are positioned between the inner and outer rings, maintaining contact via a spring or elastic element. When the shaft rotates in the forward direction, the rollers roll between the inner and outer rings. When the shaft rotates in the reverse direction, the rollers become stuck, preventing relative movement between the inner and outer rings. Compared to other structures, the check valve of the present invention has a simple structure and low cost.

[0012] Furthermore, the saw teeth are arranged at an angle, and the second end of the check rod is inserted obliquely between adjacent saw teeth. Due to the rotational motion, the non-radial tilting structure of the saw teeth allows, on the one hand, the saw teeth of the internal gear sleeve to clamp the check rod, and when the shaft sleeve and the rotating shaft are driven to rotate together, the force exerted by the saw teeth on the check rod is exactly along the length direction of the check rod, acting completely on the check rod, making the interaction between the saw teeth and the check rod more stable and reliable. On the other hand, the gap between the inclined saw teeth is shallow, and when the internal gear sleeve rotates in the opposite direction and the shaft sleeve and the rotating shaft do not rotate, the check rod can more smoothly exit the gap between the saw teeth.

[0013] Furthermore, the compression spring contacts the second end of the check rod. The compression spring may contact the middle of the check rod or the second end of the check rod. Compared to the former, the latter contacting the second end of the check rod has a more significant effect on the check rod.

[0014] Furthermore, the shaft sleeve is provided with a mounting groove, and the compression spring is located in the mounting groove. The provision of the mounting groove, on the one hand, provides a larger mounting space for the check rod and the compression spring; on the other hand, it can limit the position of the compression spring, preventing it from bending during its deformation process.

[0015] Furthermore, each energy conversion unit contains two racks, located on opposite sides of the cylinder. There are also two rotation mechanisms, each corresponding to the two racks in each energy conversion unit. The racks of each energy conversion unit mesh with the corresponding gears in the corresponding rotation mechanism. Each rotation mechanism also corresponds to a generator, with the rotating shaft of each rotation mechanism drivingly connected to the corresponding generator. The addition of an additional generator not only increases energy recovery efficiency, but the symmetrical structure also allows for more balanced movement.

[0016] Furthermore, the water inlet is also connected to a cold water pipe. When no hot water is introduced into the bottom water tank, the thermal expansion agent cools down, and when the piston body retracts, cold water can preferably be introduced into the bottom water tank through the cold water pipe to cool the thermal expansion agent more quickly and increase the cooling efficiency of the thermal expansion agent.

[0017] Furthermore, the water inlet is located at the upper part of the bottom water tank, and the water outlet is located at the lower part of the bottom water tank. This arrangement facilitates water inflow and outflow.

[0018] Furthermore, the piston cylinder is vertically arranged above the bottom water tank. In the vertical arrangement, when the piston body retracts, the gravity of the piston cylinder can help the piston cylinder retract.

[0019] Furthermore, a flywheel is mounted on the rotating shaft, and the flywheel and the generator are respectively located at the two ends of the rotating shaft. The arrangement of the flywheel can increase the rotational inertia of the rotating shaft, making the rotation of the rotating shaft more stable.

[0020] The heat energy recovery device for blast furnace slag flushing water of the present invention first adopts heat exchange technology to efficiently collect the heat energy of blast furnace slag flushing water and store it in the hot water in the hot water tank, thereby realizing the energy conversion of heat energy to heat energy. In this process, the energy transfer principle of heat exchange is used to avoid the interference of slag in the blast furnace slag flushing water during the conversion of kinetic energy to electrical energy. After ensuring that there is no slag in the water carrying heat energy and that it will not cause wear, blockage and other problems to the equipment, the device further uses the cooperation of the energy conversion unit and the rotating mechanism to contain the thermal expansion agent in the cylinder barrel of the piston cylinder, and fully utilizes the thermal expansion characteristics of the thermal expansion agent to drive the piston body of the piston cylinder to achieve telescopic movement, thereby achieving the conversion of heat energy to kinetic energy; then, the meshing of the rack and the gear is used to complete the smooth transmission from linear operation to rotation. On this basis, combined with the setting of the check valve, the rotating shaft does not reverse when the piston body retracts, creating conditions for the unidirectional rotation of the rotating shaft and the stable power generation of the generator. Under the condition that the rotating shaft has unidirectional rotation, combined with the layout of more than two energy conversion units including the bottom water tank, by precisely controlling the hot water flow, during operation, the hot water in the hot water tank can be fed into the bottom water tank of each energy conversion unit in turn through the respective water inlets. The two or more energy conversion units can work in an orderly manner and drive the rotating shaft in turn, ultimately achieving unidirectional and continuous stable rotation of the rotating shaft, and with the help of the efficient operation of the generator, completing the complete energy conversion and recovery process from thermal energy to kinetic energy to electrical energy.

[0021] The blast furnace slag flushing water heat energy recovery device of the present invention, with the interlocking energy conversion process of first thermal energy-thermal energy, then thermal energy-kinetic energy, and finally kinetic energy-electrical energy, not only completely solves the problem of the influence of slag contained in blast furnace slag flushing water on heat energy utilization, but also successfully realizes the innovative application of thermal energy power generation, opens up a broader application prospect for the recovery and utilization of heat energy, significantly improves the added value of heat energy utilization, and fully demonstrates its excellent innovative value and practical value.

[0022] In addition, the blast furnace slag water heat energy recovery device of the present invention does not need to supplement any additional form of heat energy or other energy during operation. It completely relies on the existing heat energy contained in the blast furnace slag water to efficiently complete the conversion of heat to electrical energy and realize energy recycling. This means that in the process of energy recovery, users do not need to bear additional costs or expenses, and truly realize the "free" recovery and utilization of energy. Compared with the traditional method that requires external heat to achieve heat recovery and power generation, the present invention does not need to supplement any additional form of heat energy, and only relies on the existing heat energy contained in the blast furnace slag water to complete the conversion of heat to electrical energy. In terms of energy recovery method, its application is more flexible. After energy recovery, not only energy waste is reduced, but also the operation cost is greatly reduced by avoiding the supplement of additional energy. It provides an economical, efficient and innovative solution for the recovery of waste heat in the blast furnace ironmaking production process, and has a wide range of promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 2. It is a schematic top view of the structure of the blast furnace slag flushing water heat energy recovery device of the present invention; Figure 2 It is a schematic cross-sectional view of the energy conversion unit and the rotating mechanism of the blast furnace slag flushing water heat energy recovery device of the present invention; Figure 3 2. It is a structural schematic diagram of the rotating mechanism of the blast furnace slag flushing water heat energy recovery device of the present invention; Figure 4 It is a schematic diagram of the connection structure of the hot water tank and the bottom water tank of the blast furnace slag flushing water heat energy recovery device of the present invention. DETAILED DESCRIPTION

[0024] The preferred embodiment of the blast furnace slag flushing water heat energy recovery device of the present invention is described in detail below with reference to the accompanying drawings: like Figures 1 to 4As shown, a blast furnace slag flushing water heat energy recovery device includes a hot water tank 1 for performing heat exchange with the blast furnace slag flushing water, and also includes an energy conversion unit 2 and a rotating mechanism 3; the number of the energy conversion units 2 is two or more, and each of the energy conversion units 2 includes a bottom water tank 21 and a piston cylinder 22, the bottom water tank 21 is provided with a water inlet 211 and a water outlet 212, the piston cylinder 22 includes a cylinder barrel 221 and a piston body 222, a heat conduction arrangement is provided between the cylinder barrel 221 and the bottom water tank 21, a thermal expansion agent 23 is contained in the cylinder barrel 221, the piston body 222 extends into the cylinder barrel 221 and fits with the inner wall of the cylinder barrel 221, a rack 220 extends outward from the upper part of the piston body 222 and along a length direction parallel to the piston body 222, the rack 220 is located outside the cylinder barrel 221, and the length direction of the rack 220 is parallel to the length direction of the cylinder barrel 221; the rotating mechanism 3 The mechanism 3 includes a rotating shaft 31 and several gears 32. The number of the gears 32 in each rotating mechanism 3 is the same as the number of the energy conversion units 2. The gears 32 are coaxially mounted on the rotating shaft 31 and are arranged along the axial direction of the rotating shaft 31. A check valve 33 is provided between the gear 32 and the rotating shaft 31. The check valve 33 is a check valve that allows the rotating shaft 31 to rotate in one direction only when the piston body 222 is extended. Each of the gears 32 on the rotating shaft 31 corresponds to and meshes with the rack 220 of the piston body 222 in each energy conversion unit 2; the water inlet 211 of the bottom water tank 21 of each energy conversion unit 2 is connected to the hot water tank 1; the rotating shaft 31 of the rotating mechanism 3 is connected to the generator 4 in transmission; when working, the hot water in the hot water tank 1 is sent into the bottom water tank 21 of each energy conversion unit 2 in turn through the respective water inlets 211.

[0025] The blast furnace slag water heat energy recovery device of the present invention, the hot water tank 1 is filled with hot water obtained by heat exchange with the blast furnace slag water, and the hot water in the hot water tank 1 can be obtained by directly heat exchanging the water in the hot water tank 1 with the blast furnace slag water. If the hot water tank 1 is arranged at the blast furnace slag water outlet, the water in the hot water tank 1 can be directly heat exchanged with the blast furnace slag water to obtain hot water; it can also be first heat exchanged with the blast furnace slag water through a heat exchanger to form hot water, and then the formed hot water is sent to the hot water tank 1. For example, a heat exchange steel pipe can be arranged in the blast furnace slag water, and the water in the steel pipe can be heat exchanged with the blast furnace slag water to form hot water, and then introduced into the hot water tank 1.

[0026] In the blast furnace slag flushing water heat energy recovery device of the present invention, the energy conversion unit 2 is used to convert thermal energy into kinetic energy. In the energy conversion unit 2, the bottom water tank 21 is used to hold water carrying thermal energy; the thermal expansion agent 23 serves as a thermal energy reactant; and the piston cylinder 22 performs telescopic motion under the action of the thermal expansion agent 23 therein. The rotating mechanism 3 serves as a transmission. In the rotating mechanism 3, the gear 32 meshes with the rack 220 to convert the linear motion of the rack 220 into rotation of the gear 32, the rotating shaft 31, and the generator 4. The generator 4 is used to convert kinetic energy into electrical energy.

[0027] In the blast furnace slag flushing water heat energy recovery device of the present invention, a check valve 33 is installed between the gear 32 and the rotating shaft 31. The check valve 33 is a check valve that allows the rotating shaft 31 to rotate with the rack 220 and the gear 32 when the piston body 222 is extended, and does not rotate with the rack 220 and the gear 32 when the piston body 222 is retracted. The presence of the check valve 33 allows the rotating shaft 31 to rotate only in one direction when the piston body 222 is extended. In other words, when the piston body 222 is extended, the moving rack 220 can drive the gear 32 and the rotating shaft 31 to rotate in turn; when the piston body 222 is retracted, the moving rack 220 drives the gear 32 to rotate, but the rotating gear 32 cannot drive the rotating shaft 31 to rotate.

[0028] The blast furnace slag flushing water heat energy recovery device of the present invention, when in operation, performs heat exchange with the blast furnace slag flushing water, and the obtained hot water is placed in the hot water tank 1. The hot water in the hot water tank 1 is sent to the bottom water tank 21 of the energy conversion unit 2 in turn. Specifically, the hot water in the hot water tank 1 is sent to the bottom water tank 21 of the first energy conversion unit 2, and the thermal expansion agent 23 in the cylinder 221 of the first energy conversion unit 2 expands due to heat, pushing out the piston body 222. As the piston body 222 extends, the rack 220 moves, driving the gear 32 and the rotating shaft 31 to rotate in turn. After the piston body 222 of the first energy conversion unit 2 extends to the maximum stroke, the hot water is stopped from being sent to the first energy conversion unit 2, and at the same time, the hot water tank 1 is started to send hot water to the second energy conversion unit 2. When hot water is no longer supplied to the first conversion unit 2, the water in the hot water tank 1 is released, the temperature in the bottom water tank 21 drops, and the thermal expansion agent 23 cools, causing the piston 222 to retract. As the piston 222 retracts, the rack 220 moves, driving the gear 32. However, due to the action of the check valve 33, the shaft 31 does not rotate in the reverse direction. When hot water is supplied to the second conversion unit 2, the thermal expansion agent 23 in the cylinder 221 of the second conversion unit 2 expands due to the heat, pushing out the piston 222. As the piston 222 extends, the rack 220 moves, sequentially driving the gear 32 and the shaft 31 to rotate. In this way, the hot water in the hot water tank 1 is alternately supplied to the bottom water tank 21 of each conversion unit 2, causing the piston cylinders 22 of each conversion unit 2 to extend alternately, driving the shaft 31 in turn, completing circumferential rotation and causing the generator 4 to generate electricity.

[0029] In the blast furnace slag flushing water heat energy recovery device of the present invention, a hot water valve 11 is installed on the connecting pipe between the water inlet 211 of the bottom water tank 21 and the hot water tank 1, and an outlet valve 12 is installed on the water outlet 212. When the hot water in the hot water tank 1 is alternately fed into the bottom water tank 21 of the energy conversion unit 2, it can usually be achieved by controlling the opening and closing of the hot water valve 11 and the outlet valve 12. Controlling the on-off of water flow by valves is an existing conventional technology and will not be elaborated on in detail in the present invention.

[0030] The heat energy recovery device for blast furnace slag flushing water of the present invention first adopts heat exchange technology to efficiently collect the heat energy of blast furnace slag flushing water and store it in the hot water in the hot water tank 1, thereby realizing the energy conversion of heat energy to heat energy. In this process, the energy transfer principle of heat exchange is used to avoid the interference of slag in the blast furnace slag flushing water during the conversion of kinetic energy into electrical energy. After ensuring that there is no slag in the water carrying heat energy and that it does not cause wear, blockage and other problems to the equipment, the device further uses the cooperation of the energy conversion unit 2 and the rotating mechanism 3 to contain the thermal expansion agent 23 in the cylinder barrel 221 of the piston cylinder 22, and fully utilizes the thermal expansion characteristics of the thermal expansion agent 23 to drive the piston body 222 of the piston cylinder 22 to achieve telescopic movement, thereby achieving the conversion of thermal energy to kinetic energy; then, the meshing of the rack 220 and the gear 32 is used to complete the smooth transmission from linear operation to rotation. On this basis, combined with the provision of the check valve 33, the rotating shaft 31 does not reverse when the piston body 222 retracts, creating conditions for unidirectional rotation of the rotating shaft 31 and stable power generation by the generator 4. Given the unidirectional rotation of the rotating shaft 31, combined with the layout of the two or more energy conversion units 2, including the bottom water tank 21, and by precisely controlling the hot water flow, during operation, the hot water in the hot water tank 1 is delivered alternately from the respective water inlets 211 to the bottom water tank 21 of each energy conversion unit 2. The two or more energy conversion units 2 can operate in an orderly manner, sequentially driving the rotating shaft 31, ultimately achieving unidirectional, continuous, and stable rotation of the rotating shaft 31. Leveraging the efficient operation of the generator 4, the complete energy conversion and recovery process from thermal energy to kinetic energy to electrical energy is completed.

[0031] The blast furnace slag flushing water heat energy recovery device of the present invention, with the interlocking energy conversion process of first thermal energy-thermal energy, then thermal energy-kinetic energy, and finally kinetic energy-electrical energy, not only completely solves the problem of the influence of slag contained in blast furnace slag flushing water on heat energy utilization, but also successfully realizes the innovative application of thermal energy power generation, opens up a broader application prospect for the recovery and utilization of heat energy, significantly improves the added value of heat energy utilization, and fully demonstrates its excellent innovative value and practical value.

[0032] In addition, the blast furnace slag water heat energy recovery device of the present invention does not need to supplement any additional form of heat energy or other energy during operation. It completely relies on the existing heat energy contained in the blast furnace slag water to efficiently complete the conversion of heat to electrical energy and realize energy recycling. This means that in the process of energy recovery, users do not need to bear additional costs or expenses, and truly realize the "free" recovery and utilization of energy. Compared with the traditional method that requires external heat to achieve heat recovery and power generation, the present invention does not need to supplement any additional form of heat energy, and only relies on the existing heat energy contained in the blast furnace slag water to complete the conversion of heat to electrical energy. From the perspective of energy recovery, its application is more flexible. After energy recovery, not only energy waste is reduced, but also the operation cost is greatly reduced due to the avoidance of external energy. It provides an economical, efficient and innovative solution for waste heat recovery in the blast furnace ironmaking production process, and has a wide range of promotion and application value.

[0033] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, a mounting opening 210 is provided on the bottom water tank 21, and the bottom of the cylinder 221 passes through the mounting opening 210 and extends into the bottom water tank 21. During operation, the heat of the water in the bottom water tank 21 is directly transferred to the cylinder 221. The cylinder 221 can be installed in the bottom water tank 21, and the heat of the water in the bottom water tank 21 can be transferred to the cylinder 221 through the bottom water tank 21; the bottom of the cylinder 221 can also extend into the bottom water tank 21, and the heat of the water in the bottom water tank 21 is directly transferred to the cylinder 221. Compared with the former, the latter has less loss during heat conduction and higher thermal energy utilization.

[0034] In the blast furnace slag flushing water heat energy recovery device of the present invention, the cylinder base 22 is preferably mounted on the bottom water tank 21 and sealed with the mounting opening 210. This arrangement, on the one hand, achieves stable mounting of the piston cylinder 22; on the other hand, it achieves sealing of the bottom water tank 21, ensuring that the water in the bottom water tank 21 does not overflow, and also prevents the heat of the water in the bottom water tank 21 from escaping, thereby reducing energy loss.

[0035] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, the thermal expansion agent 23 is a liquid with a high expansion coefficient, such as any one of mercury, thermal conductive oil, and transformer oil.

[0036] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, the rack 220 is located on the side of the cylinder 221, and a roller 24 is rotatably mounted on the rack 220. The roller 24 is located between the rack 220 and the cylinder seat 22, and the wheel surface of the roller 24 is tangent to the outer wall of the cylinder 221. During operation, the roller 24 rolls as the piston body 222 extends and contracts. The rack 220 can be located above the cylinder 221 or on the side of the cylinder 221. Compared with the former, when the rack 220 is located on the side of the cylinder 221, the rack 220 is opposite to the cylinder 221, and the roller 24 tangent to the outer wall of the cylinder 221 is rotatably mounted on the rack 220. The setting of the roller 24 can, on the one hand, limit the rack 220 and the cylinder 221, so that the movement of the rack 220 is more stable; on the other hand, during the movement, by forming rolling, the relative friction between the rack 220 and the cylinder 221 is reduced, so that the relative movement between the rack 220 and the cylinder 221 is smoother and less worn.

[0037] The blast furnace slag flushing water heat energy recovery device of the present invention preferably includes a check device 33 including a sleeve 331 and an inner gear sleeve 332, the sleeve 331 is coaxially sleeved on the rotating shaft 31, the gear 32 is coaxially mounted on the inner gear sleeve 332, the inner gear sleeve 332 is gap-sleeved on the outside of the sleeve 331, the inner wall of the inner gear sleeve 332 is distributed with a plurality of serrations 333 along its circumference, a check rod 334 and a compression spring 335 are provided on the sleeve 331, wherein the first end 3341 of the check rod 334 is hingedly mounted on the sleeve 331, and the second end 3342 is inserted between adjacent serrations 333, the compression spring 335 is located on the side of the check rod 334 away from the inner gear sleeve 332, one end of the compression spring 335 contacts the sleeve 331, and the other end contacts the check rod 334.

[0038] In the blast furnace slag flushing water heat energy recovery device of the present invention, the anti-return device 33 is a anti-return device in which the rotating shaft 31 rotates with the rack 220 and the gear 32 when the piston body 222 is in the extended state, and the rotating shaft 31 does not rotate with the rack 220 and the gear 32 when the piston body 222 is in the retracted state. During operation, the compression spring 335 provides a force so that the anti-return rod 334 always pushes against the adjacent serrations 333. With the presence of the anti-return rod 334, when the rack 220, the gear 32 and the inner gear sleeve 332 rotate when the piston body 222 is in the extended state, the serrations 333 apply a force in the same direction as the compression spring 335 to the anti-return rod 334, thereby blocking the anti-return rod 334 and driving the sleeve 331 and the rotating shaft 31 to rotate together. When the piston body 222 is retracted and the rack 220, gear 32, and internal gear sleeve 332 rotate in the opposite direction, the serrations 333 exert a force on the check rod 334 in the opposite direction of the compression spring 335. The compression spring 335 is further compressed, causing the check rod 334 to withdraw from the gap between the serrations 333. The rotating internal gear sleeve 332 is unable to drive the sleeve 331 and the rotating shaft 31 to rotate together, preventing the rotating shaft 31 from rotating, thereby preventing the return of the shaft. The structure of the check rod 333 can be, but is not limited to, the aforementioned ratchet check rod. It can also be a clutch check rod. The structure of a clutch check rod is generally similar to that of a single clutch, consisting of inner and outer rings and rollers. The rollers are located between the inner and outer rings and maintained in contact by a spring or elastic element. When the rotating shaft rotates in the forward direction, the rollers roll between the inner and outer rings. When the rotating shaft rotates in the reverse direction, the rollers become stuck, preventing the inner and outer rings from moving relative to each other. Compared to other structures, the check rod 33 of the present invention has a simpler structure and lowers cost.

[0039] In the blast furnace slag flushing water heat energy recovery device of the present invention, it is preferred that the saw teeth 333 are arranged at an angle, and the second end 3342 of the check rod 334 is inserted at an angle between adjacent saw teeth 333. Due to the rotational motion, the saw teeth 333 are arranged in a non-radial inclined structure. On the one hand, the saw teeth 333 of the inner gear sleeve 332 clamp the check rod 334, and when the shaft sleeve 331 and the rotating shaft 31 are driven to rotate together, the force exerted by the saw teeth 333 on the check rod 334 is exactly along the length direction of the check rod 334, fully acting on the check rod 334, making the interaction relationship between the saw teeth 333 and the check rod 334 more stable and reliable. On the other hand, the gap between the inclined saw teeth 333 is shallow. When the inner gear sleeve 332 rotates in the opposite direction and the shaft sleeve 331 and the rotating shaft 31 do not rotate, the check rod 334 can exit the gap between the saw teeth 333 more smoothly.

[0040] In the blast furnace slag flushing water heat energy recovery device of the present invention, the compression spring 335 preferably contacts the second end 3342 of the check rod 334. The compression spring 335 may contact the middle of the check rod 334 or the second end 3342 of the check rod 334. Compared to the former, the latter contact with the second end 3342 of the check rod 334 has a more significant effect on the check rod 334.

[0041] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, the shaft sleeve 331 is provided with a mounting groove 3311, and the compression spring 335 is located within the mounting groove 3311. The provision of the mounting groove 3311, on the one hand, provides a larger installation space for the check rod 334 and the compression spring 335; on the other hand, it can limit the position of the compression spring 335, preventing it from bending during its deformation.

[0042] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, each of the energy conversion units 2 includes two racks 220, each located on opposite sides of the cylinder 221. There are also two rotating mechanisms 3, each corresponding one-to-one to the two racks 220 of each energy conversion unit 2. The rack 220 of each energy conversion unit 2 meshes with the corresponding gear 32 in the corresponding rotating mechanism 3. Each rotating mechanism 3 also corresponds to a generator 4, and the rotating shaft 31 of each rotating mechanism 3 is in transmission connection with the corresponding generator 4. The addition of an additional generator not only increases the energy recovery rate, but the symmetrical structure also allows for more balanced movement.

[0043] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, the water inlet 211 is also connected to the cold water pipe 10. When no hot water is introduced into the bottom water tank 21, the thermal expansion agent 23 cools down. When the piston body 222 retracts, in order to cool the thermal expansion agent 23 more quickly and increase the cooling efficiency of the thermal expansion agent 23, cold water can preferably be introduced into the bottom water tank 21 through the cold water pipe 10.

[0044] In the blast furnace slag flushing water heat energy recovery device of the present invention, a cold water valve 13 is installed on the cold water pipe 10. When cold water is introduced into the bottom water tank 21, the cold water can be controlled by the cold water valve 13.

[0045] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, the water inlet 211 is located at the upper part of the bottom water tank 21, and the water outlet 212 is located at the lower part of the bottom water tank 21. This arrangement facilitates water inlet and outlet.

[0046] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, the piston cylinder 22 is vertically arranged above the bottom water tank 21. In the vertical structure, when the piston body 222 retracts, the gravity of the piston cylinder 22 can help the piston cylinder 22 retract.

[0047] In the blast furnace slag flushing water heat energy recovery device of the present invention, preferably, a flywheel 41 is mounted on the rotating shaft 31, and the flywheel 41 and the generator 4 are respectively located at the two ends of the rotating shaft 31. The provision of the flywheel 41 can increase the rotational inertia of the rotating shaft 31, making the rotation of the rotating shaft 31 more stable.

[0048] The structure and working principle of the blast furnace slag flushing water heat energy recovery device of the present invention are all based on existing technologies, and the present invention will not elaborate on this.

[0049] For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A blast furnace slag flushing water heat energy recovery device, characterized by: It includes a hot water tank for heat exchange with blast furnace slag flushing water, and also includes a conversion unit and a rotating mechanism; the number of the conversion units is two or more, each of the conversion units includes a bottom water tank and a piston cylinder, the bottom water tank is provided with a water inlet and a water outlet, the piston cylinder includes a cylinder barrel and a piston body, a heat conduction arrangement is provided between the cylinder barrel and the bottom water tank, a thermal expansion agent is contained in the cylinder barrel, the piston body extends into the cylinder barrel and fits with the inner wall of the cylinder barrel, the upper part of the piston body is extended outward and along the length direction parallel to the piston body with a rack, the rack is located outside the cylinder barrel; each of the rotating mechanisms includes a rotating shaft and a plurality of gears, and each of the rotating mechanisms has a plurality of gears. The number of the gears is the same as the number of the energy conversion units. The gears are coaxially mounted on the rotating shaft and are arranged along the axial direction of the rotating shaft. A check valve is provided between the gears and the rotating shaft. The check valve allows the rotating shaft to rotate in one direction only when the piston body is extended. Each of the gears on the rotating shaft corresponds one-to-one to and meshes with the rack on the piston body in each of the energy conversion units; the water inlet of the bottom water tank of each energy conversion unit is connected to the hot water tank; the rotating shaft of the rotating mechanism is connected to the generator transmission; during operation, the hot water in the hot water tank is sent into the bottom water tank of each energy conversion unit in turn through the respective water inlets.

2. The blast furnace slag flushing water heat energy recovery device according to claim 1, characterized in that: The bottom water tank is provided with a mounting opening, and the bottom of the cylinder passes through the mounting opening and extends into the bottom water tank.

3. The blast furnace slag flushing water heat energy recovery device according to claim 2, characterized in that: The cylinder seat is mounted on the bottom water tank and sealed with the mounting opening.

4. The blast furnace slag flushing water heat energy recovery device according to claim 1, characterized in that: The thermal expansion agent is a liquid with a high expansion coefficient.

5. The blast furnace slag flushing water heat energy recovery device according to claim 1, characterized in that: The rack is located on the side of the cylinder, and a roller is rotatably mounted on the rack. The roller is located between the rack and the cylinder seat, and the wheel surface of the roller is tangent to the outer wall of the cylinder.

6. The blast furnace slag flushing water heat energy recovery device according to claim 1, characterized in that: The anti-return device includes a sleeve and an inner gear sleeve, the sleeve is coaxially sleeved on the rotating shaft, the gear is coaxially installed on the inner gear sleeve, the inner gear sleeve is gap-sleeved on the outside of the sleeve, the inner wall of the inner gear sleeve is distributed with a plurality of serrations along its circumference, and the sleeve is provided with an anti-return rod and a compression spring, wherein the first end of the anti-return rod is hingedly installed on the sleeve and the second end is inserted between adjacent serrations, and the compression spring is located on the side of the anti-return rod away from the inner gear sleeve, one end of the compression spring touches the sleeve and the other end touches the anti-return rod.

7. The blast furnace slag flushing water heat energy recovery device according to claim 6, characterized in that: The saw teeth are arranged obliquely, and the second end of the anti-return rod is inserted obliquely between adjacent saw teeth; the compression spring contacts the second end of the anti-return rod; a mounting groove is opened on the shaft sleeve, and the compression spring is located in the mounting groove.

8. The blast furnace slag flushing water heat energy recovery device according to claim 1, characterized in that: There are two racks in each of the energy conversion units, and the two racks are located on two opposite sides of the cylinder. There are also two rotating mechanisms, and the two rotating mechanisms correspond one-to-one to the two racks of each of the energy conversion units. The rack of each energy conversion unit is meshed with the corresponding gear in the corresponding rotating mechanism; each rotating mechanism also corresponds to a generator, and the rotating shaft of each rotating mechanism is transmission-connected to the corresponding generator.

9. The blast furnace slag flushing water heat energy recovery device according to claim 1, characterized in that: The water inlet is also communicated with a cold water pipe.

10. The blast furnace slag flushing water heat energy recovery device according to claim 1, characterized in that: The water inlet is located at the upper part of the bottom water tank, and the water outlet is located at the lower part of the bottom water tank; the piston cylinder is vertically arranged above the bottom water tank; a flywheel is installed on the rotating shaft, and the flywheel and the generator are respectively located at the two ends of the rotating shaft.

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