Rolled metal material waste heat recovery device and method

Abstract

The invention discloses a device and a method for recovering waste heat of rolled metal materials. The device comprises a cover body mechanism, the method comprises the following steps: S1, placing a rolled metal material; s2, waste heat recovery; s3, supplementing water; through cooperation of the cover body mechanism, the air inducing mechanism, the heat exchange mechanism, the steam generator, the circulating mechanism and the water softener, large-scale tunnel type recovery of waste heat of rolled metal materials can be achieved, and through cooperation of a control system and an automatic system model, the cooling duration of the rolled metal materials can be controlled according to later process requirements; uniform cooling of the metal material is achieved, and the performance of the metal material is optimized. The cooling efficiency of rolled metal materials is effectively improved, waste heat recycling is achieved, and therefore energy consumption can be reduced, and carbon dioxide emission is reduced; and through the bearing mechanism, the rolled metal material can be supported and limited, the stability of the rolled metal material in the cover body mechanism can be improved, and the rolled metal material can be conveniently taken and placed.

Description

Technical Field

[0001] The present invention relates to the technical field of hot rolling and subsequent production process, and in particular to a device and method for recovering waste heat from rolled metal materials. Background Art

[0002] Hot rolling is rolling performed above the crystallization temperature. Simply put, a piece of steel billet is heated and rolled several times, then trimmed and corrected into a steel plate. This is called hot rolling. It can significantly reduce energy consumption and reduce costs. During hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation. Hot rolling can improve the processing performance of metals and alloys, that is, crush the coarse grains in the cast state, significantly heal cracks, reduce or eliminate casting defects, transform the cast structure into a deformed structure, and improve the processing performance of the alloy.

[0003] For example, after rolling, the metal material is still at a very high temperature when it is hoisted from the cooling bed to the storage and transportation area, usually between 450 and 500°C. Since this part of sensible heat is difficult to recover, steel mills usually use natural cooling methods to reduce the temperature of the rolled metal material to below 200°C or to room temperature. However, this cooling process takes 50 to 60 hours to complete, and this part of the heat is also wasted as waste heat.

[0004] To this end, a device and method for recovering waste heat from rolled metal materials are proposed. Summary of the invention

[0005] The technical task of the present invention is to provide a waste heat recovery device and method for rolling metal materials in view of the above shortcomings, so as to solve the above problems.

[0006] To achieve the above object, the present invention provides the following technical solutions: A device for recovering waste heat from rolled metal materials comprises a cover body mechanism, on which an auxiliary draft mechanism is provided for transferring heat from the lower part of the inner cavity of the cover body mechanism to the upper part of the heat exchanger mechanism, the inner cavity of the cover body mechanism is provided with a heat exchange mechanism for heat exchange between hot gas and heat transfer medium and a supporting mechanism for supporting the rolled metal material from top to bottom, the cover body mechanism is used to provide a supporting basis for the auxiliary draft mechanism and the heat exchange mechanism and can form a relatively closed space, one side of the cover body mechanism is provided with a steam generator that can utilize thermal energy to heat water into hot water or steam, a circulation mechanism for realizing cyclic heat conduction is provided between the steam generator and the heat exchange mechanism, and one side of the steam generator is provided with a water softener for supplying soft water to the steam generator.

[0007] Preferably, the cover body mechanism comprises a hood, the front side or bottom surface of the hood is an open structure, an upper baffle is fixedly connected to the upper part of the front side of the hood, and an opening and closing component is provided at the lower part of the front side of the hood; The auxiliary air induction mechanism comprises an air hood, the air hood is connected to the top of the machine hood, an induced draft fan is arranged on one side of the air hood, the air inlet end of the induced draft fan is connected to the air hood, the air outlet end of the induced draft fan is connected to an air guide pipe, and the end of the air guide pipe away from the induced draft fan is connected to the lower part of the inner cavity of the machine hood; The heat exchange mechanism includes a plate heat exchanger, which is fixedly connected to the upper part of the inner cavity of the hood, and the bottom of the plate heat exchanger is connected to the air collecting hood, and a gas flow channel is formed between the air collecting hood, the plate heat exchanger, the air hood, the induced draft fan, the air guide pipe and the hood; The steam generator comprises a steam tank, which is located on one side of the hood, the top of which is connected to a steam outlet pipe, the steam outlet pipe is equipped with a steam-water separation device, and the steam tank is connected to a plate heat exchanger through a circulation mechanism; The circulation mechanism includes a circulation pump, which is located below the steam tank. The inlet end of the circulation pump is connected to the outlet end of the steam tank. The outlet end of the circulation pump is connected to a hose A. The inlet end of the steam tank is connected to a hose B. The hose B and the other end of the hose A are respectively connected to a liquid guide tube, the other end of one of the liquid guide tubes is connected to the inlet end of the plate heat exchanger, and the other end of the other liquid guide tube is connected to the outlet end of the plate heat exchanger. A medium flow channel is formed among the steam tank, the circulation pump, the hose A, one of the liquid guide tubes, the plate heat exchanger, the other liquid guide tube and the hose B; The water softener comprises a soft water tank, the outlet end of the soft water tank is connected with a hose C, the other end of the hose C is connected with a water supply pump, the water supply pump is located below the steam tank and is connected with the water supply port end of the steam tank, the inlet end of the soft water tank is connected with an external water source, and valves are installed on the hose C, the hose A, the hose B and the inlet and outlet ends of the plate heat exchanger respectively; The supporting mechanism comprises a bracket assembly, the bracket assembly is located below the inner cavity of the hood, and a moving wheel is provided at each of the four corners of the bottom of the bracket assembly; The bracket assembly includes a supporting plate, and a limit seat is fixedly connected to the front and rear sides of the top of the supporting plate. The opposite sides of the two limit seats are each provided with an inclined surface, and the two inclined surfaces are symmetrically arranged about the center of the supporting plate.

[0008] Compared with the prior art, the advantages and positive effects of the present invention are: 1. The present invention can realize large-scale tunnel-type recovery of waste heat of metal materials after rolling through the coordinated use of a cover mechanism, an auxiliary air-inducing mechanism, a heat exchange mechanism, a steam generator, a circulation mechanism and a water softener. Through the coordination of a control system and an automation system model, the cooling time of the metal materials after rolling can be controlled according to the requirements of the later process, so as to realize uniform cooling of the metal materials and optimize the performance of the metal materials. This not only effectively improves the cooling efficiency of the metal materials after rolling, but also realizes waste heat recovery and utilization, thereby helping to reduce energy consumption and reduce carbon dioxide emissions. 2. The present invention, through the setting of the supporting mechanism, can play a supporting and limiting role for the rolled metal material, which can not only improve the stability of the rolled metal material placed in the cover mechanism, but also facilitate the taking and placing of the rolled metal material, and improve the flexibility of placing or removing the rolled metal material from the cover mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 The structure of the waste heat recovery device for rolling metal materials according to the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 The structure of the waste heat recovery device for rolling metal materials according to the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a structural schematic diagram of the opening and closing components of the rolled metal material waste heat recovery device according to an embodiment of the present invention in an open state; Figure 4 It is a structural schematic diagram of a hood, an air induction mechanism and a supporting mechanism of a waste heat recovery device for rolling metal materials according to an embodiment of the present invention; Figure 5 This is a schematic structural diagram of a hood and an air induction mechanism of a waste heat recovery device for rolling metal materials according to an embodiment of the present invention; Figure 6 It is a schematic structural explosion diagram of a hood, an air induction mechanism and a supporting mechanism of a waste heat recovery device for rolling metal materials according to an embodiment of the present invention; Figure 7 It is a structural schematic diagram of the induced draft mechanism and the heat exchange mechanism of the waste heat recovery device for rolling metal materials according to an embodiment of the present invention; Figure 8 It is a schematic diagram of the structure explosion of the heat exchange mechanism of the waste heat recovery device for rolling metal materials according to an embodiment of the present invention; Fig. 9The present invention is a flowchart of a method for recovering waste heat from rolled metal materials according to an embodiment of the present invention.

[0011] In the figure: 100, cover body mechanism; 110, machine cover; 111, ventilation hole; 120, upper baffle; 130, opening and closing assembly; 131, lower baffle; 132, bump; 133, rodless cylinder; 140, filter screen; 200, auxiliary air induction mechanism; 210, air hood; 220, air induction fan; 230, air guide duct; 300, heat exchange mechanism; 310, plate heat exchanger; 320, air collecting hood; 400, steam generator; 410, steam tank; 420, steam outlet pipe; 430, liquid level gauge; 500, circulation mechanism; 510, circulation pump; 520, hose A; 530, hose B; 540, liquid guiding tube; 600, water softener; 610, soft water tank; 620, hose C; 630, water supply pump; 700, supporting mechanism; 710, bracket assembly; 711, supporting plate; 712, limiting seat; 720, moving wheel; 800. Bracket. DETAILED DESCRIPTION

[0012] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0014] Example 1 like Figure 1-Figure 8 As shown, a waste heat recovery device for rolled metal materials according to an embodiment of the present invention includes a cover body mechanism 100, on which an auxiliary draft mechanism 200 is provided for transferring heat from the lower part of the inner cavity of the cover body mechanism 100 to the upper part. The inner cavity of the cover body mechanism 100 is provided with a heat exchange mechanism 300 for heat exchange between hot gas and heat-conducting medium and a supporting mechanism 700 for supporting the rolled metal material from top to bottom. The cover body mechanism 100 is used to provide a supporting basis for the auxiliary draft mechanism 200 and the heat exchange mechanism 300 and can form a relatively closed space. A steam generator 400 that can use thermal energy to heat water into hot water or steam is provided on one side of the cover body mechanism 100. A circulation mechanism 500 for realizing cyclic heat conduction is provided between the steam generator 400 and the heat exchange mechanism 300. A water softener 600 for supplying soft water to the steam generator 400 is provided on one side of the steam generator 400.

[0015] Example 2 like Figure 1-Figure 8 As shown, the present embodiment provides a waste heat recovery device for rolling metal materials, which is different from the embodiment 1 in that: The cover body mechanism 100 includes a hood 110, the front side and the bottom of the hood 110 are open structures, the upper part of the front side of the hood 110 is fixedly connected to an upper baffle 120, and the lower part of the front side of the hood 110 is provided with an opening and closing assembly 130. The cover body mechanism 100 can provide a relatively closed space for the rolled metal material, so as to facilitate the subsequent waste heat recovery operation of the rolled metal material; the opening and closing assembly 130 includes a lower baffle 131 movably connected to the front side of the hood 110, and both sides of the lower baffle 131 are fixedly connected to a protrusion 132, and both sides of the front side of the hood 110 are vertically fixedly connected to a rodless cylinder 133, the rodless cylinder 133 and the protrusion 132 are arranged in a one-to-one correspondence, and the slide of the rodless cylinder 133 is fixed to one side of the protrusion 132 Fixed connection, by starting the rodless cylinder 133, the protrusion 132 and the lower baffle 131 can be driven to move upward or downward through the slide, so that the automatic opening and closing operation of the lower baffle 131 can be realized, so that the rolled metal material can be taken and placed through the supporting mechanism 700; two ventilation holes 111 arranged vertically are opened on one side of the hood 110, and two filters 140 arranged vertically and used to block the ventilation holes 111 are installed on one side of the hood 110. The filter nets 140 and the ventilation holes 111 are arranged one by one. The filter nets 140 can filter the gas entering the hood 110 to prevent large volumes of impurities from being sucked into the inner cavity of the hood 110, and at the same time help to improve the safety of the auxiliary air induced mechanism 200 during operation.

[0016] The auxiliary draft mechanism 200 includes a hood 210, which is connected to the top of the hood 110. A draft fan 220 is provided on one side of the hood 210. The air inlet end of the induced draft fan 220 is connected to the hood 210, and the air outlet end of the induced draft fan 220 is connected to an air duct 230. The end of the air duct 230 away from the induced draft fan 220 is connected to the lower part of the inner cavity of the hood 110. The heat can be quickly absorbed into the heat exchange mechanism 300 through the draft mechanism 200 to realize the waste heat recovery operation of the rolled metal material.

[0017] The heat exchange mechanism 300 includes a plate heat exchanger 310, which is fixedly connected to the upper part of the inner cavity of the hood 110. The bottom of the plate heat exchanger 310 is connected to an air collecting hood 320, which can gather and guide the heat in the hood 110. A gas circulation channel is formed between the air collecting hood 320, the plate heat exchanger 310, the wind hood 210, the auxiliary induced draft fan 220, the air duct 230 and the hood 110.

[0018] The steam generator 400 includes a steam tank 410, which is located on one side of the hood 110. The top of the steam tank 410 is connected to a steam outlet pipe 420, and the steam outlet pipe 420 has a steam-water separation device built in. The steam tank 410 is connected to the plate heat exchanger 310 through a circulation mechanism 500. A liquid level gauge 430 is provided on one side of the steam tank 410, and the liquid level gauge 430 and the steam tank 410 are connected by a flange, so that the liquid level in the steam tank 410 can be observed in real time through the liquid level gauge 430.

[0019] The circulation mechanism 500 includes a circulation pump 510, which is located below the steam tank 410. The inlet end of the circulation pump 510 is connected to the outlet end of the steam tank 410, and the outlet end of the circulation pump 510 is connected to a hose A520. The inlet end of the steam tank 410 is connected to a hose B530. The other ends of the hose B530 and the hose A520 are respectively connected to a liquid guide tube 540, the other end of one of the liquid guide tubes 540 is connected to the inlet end of the plate heat exchanger 310, and the other end of the other liquid guide tube 540 is connected to the outlet end of the plate heat exchanger 310. A medium flow channel is formed among the steam tank 410, the circulation pump 510, the hose A520, one of the liquid guide tubes 540, the plate heat exchanger 310, the other liquid guide tube 540 and the hose B530.

[0020] The water softener 600 includes a soft water tank 610, the outlet end of the soft water tank 610 is connected to a hose C620, the other end of the hose C620 is connected to a water replenishment pump 630, the water replenishment pump 630 is located below the steam tank 410 and is connected to the water replenishment port end of the steam tank 410, the inlet end of the soft water tank 610 is connected to an external water source, and valves are installed on the inlet and outlet ends of the hose C620, the hose A520, the hose B530 and the plate heat exchanger 310, respectively.

[0021] The supporting mechanism 700 includes a bracket assembly 710, which is located below the inner cavity of the hood 110. A movable wheel 720 is provided at the four corners of the bottom of the bracket assembly 710; the bracket assembly 710 includes a horizontally arranged supporting plate 711, and a limit seat 712 is fixedly connected to the front and rear sides of the top of the supporting plate 711, which can limit the rolled metal material supported on the supporting plate 711 to prevent the rolled metal material from shaking on the supporting plate 711, thereby helping to improve the supporting stability of the supporting mechanism 700, and an inclined surface is provided on the opposite side of the two limit seats 712, and the two inclined surfaces are symmetrically arranged about the center of the supporting plate 711 so as to support rolled metal materials of different sizes.

[0022] The bottom of the steam tank 410 and the soft water tank 610 are fixedly connected with a bracket 800, which can support and elevate the steam tank 410 and the soft water tank 610 so that the circulation pump 510 and the water supply pump 630 can be hidden and installed later to improve the overall neatness and aesthetics.

[0023] It also includes a control system. The rodless cylinder 133, the induced draft fan 220, the liquid level meter 430, the circulation pump 510, the soft water tank 610, the water supply pump 630 and the valve are electrically connected to the control system respectively. The liquid level meter 430 can send the liquid level signal of the steam tank 410 to the control system. The control system receives the liquid level signal and controls the operation of the valves on the water supply pump 630 and the hose C620 to achieve the purpose of controlling the liquid level. The auxiliary induced draft fan 220 and the circulation pump 510 are both driven by servo motors. Through the coordination of the control system and the automation system model, the cooling time of the metal material after rolling can be controlled according to the later process requirements to adjust the flow of hot air and the heat transfer medium, so as to achieve uniform cooling of the metal material and optimize the performance of the metal material.

[0024] Example 3 like Fig. 9 As shown, the present embodiment provides a method for recovering waste heat from rolled metal materials, which utilizes the above-mentioned waste heat recovery device for rolled metal materials to recover waste heat from rolled metal materials, and specifically includes the following steps: S1. Placing rolled metal materials: hoisting rolled metal materials with a temperature of 480°C and a weight of 22.5 tons from the storage and transportation area onto the supporting plate 711, so that the supporting plate 711 supports the rolled metal materials, limits the rolled metal materials by the limiting seat 712, and uses the moving wheel 720 to move the rolled metal materials to the lower part of the inner cavity of the hood 110; starting the rodless cylinder 133, so that the slide of the rodless cylinder 133 drives the protrusion 132 and the lower baffle 131 to move downward synchronously to the maximum limit, thereby placing the rolled metal materials in a relatively closed space, effectively limiting the heat in this space, and facilitating subsequent collection; S2. Waste heat recovery: 1 ton of normal temperature water is stored in the steam tank 410, and the circulation pump 510 is started. The circulation pump 510 transports the normal temperature water in the steam tank 410 to the plate heat exchanger 310 through the hose A520 and one of the liquid guide pipes 540; the induced draft fan 220 is started, and the induced draft fan 220 draws the heat in the inner cavity of the hood 110 into the plate heat exchanger through the wind collecting hood 320. After heat exchange through the plate heat exchanger 310, the gas is blown into the inner cavity of the hood 110 through the wind hood 210, the induced draft fan 220 and the air guide pipe 230 in turn to realize cyclic heat exchange, and the air in the hood 110 can be supplemented through the ventilation hole 111; the heated liquid is transported to the inner cavity of the steam tank 410 through another liquid guide pipe 540 and the hose B530. Then the effect of cyclic heat conduction is achieved; after waiting for 60 minutes, the steam in the steam tank 410 begins to emerge through the steam outlet pipe 420, and the water level in the steam tank 410 also begins to change. After 18 hours, the temperature of the metal material drops to 200°C. According to the water level calculation, 850 kg of water in the steam tank 410 is evaporated within 18 hours. The surface temperature of the metal material after rolling does not change. The waste heat recovery continues when the roll is changed. According to the average digital calculation, the gas production of the rolled metal material between 480 and 500°C is about 38 kg per ton of rolled metal material. Therefore, the cooling rate and steam volume parameters of the metal material are obtained, and the large-scale tunnel waste heat recovery process can be carried out. The steam-water separation device separates water and steam, and the saturated steam finally separated can be directly incorporated into the steam network or used for power generation; S3. Water replenishment: The liquid level meter 430 observes the liquid level in the steam tank 410 in real time and can send a liquid level signal of the steam tank 410 to the control system. The control system receives the liquid level signal and controls the start of the water replenishment pump 630 and the opening of the valve on the hose C620, so that the water replenishment pump 630 transports the soft water in the soft water tank 610 to the inner cavity of the steam tank 410 through the hose C620 and the water replenishment pump 630, thereby achieving the purpose of controlling the liquid level in the steam tank 410.

[0025] Through the above specific implementations, those skilled in the art can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific implementations. On the basis of the disclosed implementations, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions.

Claims

1. A waste heat recovery device for rolling metal materials, characterized in that: include: A cover body mechanism (100) is provided with an auxiliary air induction mechanism (200) for transferring heat from the lower part of the inner cavity of the cover body mechanism (100) to the upper part; the inner cavity of the cover body mechanism (100) is provided with a heat exchange mechanism (300) for heat exchange between hot gas and a heat-conducting medium and a supporting mechanism (700) for supporting rolled metal materials from top to bottom; the cover body mechanism (100) is used to provide a support base for the auxiliary air induction mechanism (200) and the heat exchange mechanism (300) and is capable of forming a relatively closed space; a steam generator (400) capable of utilizing heat energy to heat water into hot water or steam is provided on one side of the cover body mechanism (100); a circulation mechanism (500) for realizing cyclic heat conduction is provided between the steam generator (400) and the heat exchange mechanism (300); and a water softener (600) for supplying soft water to the steam generator (400) is provided on one side of the steam generator (400).

2. The rolled metal material waste heat recovery device according to claim 1, characterized in that: The cover body mechanism (100) comprises a hood (110), the front side surface or the bottom surface of the hood (110) being an open structure, the upper portion of the front side surface of the hood (110) being fixedly connected to an upper baffle (120), and the lower portion of the front side surface of the hood (110) being provided with an opening and closing assembly (130).

3. The rolled metal material waste heat recovery device according to claim 2, characterized in that: The auxiliary air induction mechanism (200) comprises an air hood (210), the air hood (210) being connected to the top of the machine hood (110), an induced draft fan (220) being provided on one side of the air hood (210), an air inlet end of the induced draft fan (220) being connected to the air hood (210), an air outlet end of the induced draft fan (220) being connected to an air guide pipe (230), and an end of the air guide pipe (230) away from the induced draft fan (220) being connected to the inner cavity of the machine hood (110).

4. The rolled metal material waste heat recovery device according to claim 3, characterized in that: The heat exchange mechanism (300) comprises a plate heat exchanger (310), the plate heat exchanger (310) being fixedly connected to the upper portion of the inner cavity of the hood (110), the bottom of the plate heat exchanger (310) being connected to an air collecting hood (320), and a flow channel being formed among the air collecting hood (320), the plate heat exchanger (310), the air hood (210), the induced draft fan (220), the air guide duct (230) and the hood (110).

5. The rolled metal material waste heat recovery device according to claim 4, characterized in that: The steam generator (400) comprises a steam tank (410), the steam tank (410) being located on one side of the hood (110), the top of the steam tank (410) being connected to a steam outlet pipe (420), the steam outlet pipe (420) having a steam-water separation device built therein, and the steam tank (410) being connected to a plate heat exchanger (310) via a circulation mechanism (500).

6. The rolled metal material waste heat recovery device according to claim 5, characterized in that: The circulation mechanism (500) comprises a circulation pump (510), the circulation pump (510) being located below the steam tank (410), the inlet end of the circulation pump (510) being connected to the outlet end of the steam tank (410), the outlet end of the circulation pump (510) being connected to a hose A (520), the inlet end of the steam tank (410) being connected to a hose B (530), and the other ends of the hose B (530) and the hose A (520) being respectively connected to a liquid guide tube (540).

7. The rolled metal material waste heat recovery device according to claim 6, characterized in that: The other end of one of the liquid guiding tubes (540) is in communication with the inlet end of the plate heat exchanger (310), and the other end of the other liquid guiding tube (540) is in communication with the outlet end of the plate heat exchanger (310); a medium flow channel is formed among the steam tank (410), the circulation pump (510), the hose A (520), one of the liquid guiding tubes (540), the plate heat exchanger (310), the other liquid guiding tube (540), and the hose B (530).

8. The rolled metal material waste heat recovery device according to claim 7, characterized in that: The water softener (600) comprises a soft water tank (610), the outlet end of the soft water tank (610) being connected to a hose C (620), the other end of the hose C (620) being connected to a water replenishment pump (630), the water replenishment pump (630) being located below the steam tank (410) and being connected to the water replenishment port end of the steam tank (410), the inlet end of the soft water tank (610) being connected to an external water source, and valves being installed on the inlet and outlet ends of the hose C (620), the hose A (520), the hose B (530) and the plate heat exchanger (310), respectively.

9. The rolled metal material waste heat recovery device according to claim 8, characterized in that: The supporting mechanism (700) comprises a bracket assembly (710), the bracket assembly (710) being located below the inner cavity of the hood (110), and a moving wheel (720) being provided at each of the four corners of the bottom of the bracket assembly (710).

10. The rolled metal material waste heat recovery device according to claim 9, characterized in that: The bracket assembly (710) comprises a supporting plate (711), and a limiting seat (712) is fixedly connected to the front and rear sides of the top of the supporting plate (711), and an inclined surface is provided on the opposite side of the two limiting seats (712), and the two inclined surfaces are symmetrically arranged about the center of the supporting plate (711).

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