Hot-rolled steel billet finished product cooling bed waste heat recovery device

Abstract

The utility model discloses a hot-rolled steel billet finished product cooling bed waste heat recovery device which comprises a cooling bed body and a plurality of heat collecting covers arranged above the cooling bed body, a heat collecting main pipe is connected above the heat collecting covers, and the end portion of the heat collecting main pipe is sequentially connected with a waste heat boiler, a steam turbine and a generator. A heat collection dust remover is arranged between each heat collection cover and the heat collection main pipe and comprises a dust removal conical hopper and a heat collection box installed at the top of the dust removal conical hopper, a communicating hole is formed in the bottom of the heat collection box, a filter screen is installed in the communicating hole, and an ash removal assembly in sliding contact with the filter screen is installed in the dust removal conical hopper. A flow stabilizing tank is arranged between the heat collecting main pipe and the waste heat boiler, and a heat accumulator is arranged between the waste heat boiler and the steam turbine. The device can thoroughly solve the problem of pipeline blockage and improve the recovery rate of hot air; the stability of hot air flow can be improved, and the generating capacity stability of the generator is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel rolling production equipment, and in particular relates to a waste heat recovery device for a cooling bed of a hot-rolled steel billet finished product. Background Art

[0002] The cooling bed is one of the indispensable auxiliary equipment in small and medium-sized bar workshops. Its function is to shear the bars into multiple lengths after rolling on the rolling mill through the flying shear, and then transport and unload them onto the cooling bed rack for cooling, so that their temperature drops from 900℃ to 100-300℃. The cooling bed unloading device then collects them into groups and sends them to the output roller, and then the output roller sends them to the cold shear to cut them into fixed-length finished products. The existing cooling bed mainly adopts the air cooler to blow air to cool the cooling bed in the process of cooling the product. After the cooling absorbs the heat of the product, the temperature rises. The direct discharge of the hot air after the temperature rises will cause a large amount of heat energy waste. In the cooling process of the existing cooling bed, in order to avoid the waste of heat energy, a plurality of heat collecting covers are set above the cooling bed. The heat collecting covers are used to collect the hot air, and then sent to the hot boiler through the heat collecting main pipe, and the heat of the hot air is transferred to water, which is converted into steam. The steam enters the steam turbine unit to drive the generator to generate electricity, thereby achieving the purpose of waste heat utilization. In the above-mentioned waste heat utilization process of the cooling bed, first, the oxide scale on the surface of the product after cooling will enter the system with the heat collecting cover, which will cause the system to be blocked. Second, the side hot air generated by the heat collecting cover directly enters the waste heat boiler for use, and the air flow pressure is extremely unstable. The hot air directly enters the waste heat boiler, which will cause the steam flow generated by the waste heat boiler to be unstable, which will affect the subsequent power generation efficiency. Therefore, it is an objective need to develop a waste heat recovery device for the cooling bed of hot-rolled steel billet products with a reasonable structural design that can avoid system blockage and improve the waste heat power generation effect. Summary of the Invention

[0003] The purpose of the utility model is to provide a waste heat recovery device for a hot-rolled steel billet finished product cooling bed with a reasonable structural design, which can avoid system blockage and improve the waste heat power generation effect.

[0004] The purpose of the utility model is achieved in this way, including a cooling bed body and a plurality of heat collecting covers arranged above the cooling bed body, a heat collecting main pipe is connected to the top of the plurality of heat collecting covers, the ends of the heat collecting main pipe are connected to the waste heat boiler, the steam turbine and the generator in sequence, a heat collecting dust collector is arranged between each heat collecting cover and the heat collecting main pipe, the heat collecting dust collector includes a dust collecting cone and a heat collecting box installed on the top of the dust collecting cone, a connecting hole is provided at the bottom of the heat collecting box, a filter is installed in the connecting hole, a dust cleaning component that is in sliding contact with the filter is installed in the dust collecting cone, a stabilizing tank is provided between the heat collecting main pipe and the waste heat boiler, a stabilizing component is provided in the stabilizing tank, a pressure relief component is provided on the top of the stabilizing tank, and a heat accumulator is provided between the waste heat boiler and the steam turbine.

[0005] Compared with the existing technology, the advantages of this device are: first, a heat collecting dust collector is set between each heat collecting cover and the heat collecting main pipe. The heat collecting dust collector can remove dust from the hot air collected by the heat collecting cover, intercept impurities such as oxide scale and dust carried in the hot air, reduce the content of hot air, completely solve the problem of pipeline blockage, and improve the recovery rate of hot air; second, the set flow stabilization tank can buffer the hot air recovered by the heat collecting cover, stabilize the hot air flow entering the flow stabilization tank, which can ensure the stability of the hot air flow entering the waste heat boiler, and allow the waste heat boiler to generate stable steam. The generated steam enters the heat accumulator for storage, and then enters the steam turbine to drive the generator to generate electricity, which can ensure the stability of the generator's power generation, can greatly improve the waste heat recovery efficiency, and thus can significantly improve the effect of waste heat power generation. It has the advantages of simple structure, high waste heat utilization rate, and stable operation, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0007] Figure 2 This is a schematic structural diagram of the heat collecting dust collector 7 in the present invention;

[0008] Figure 3 This is a schematic structural diagram of the flow stabilizing tank 8 in the present invention;

[0009] Figure 4 for Figure 3 A magnified schematic diagram of part A;

[0010] In the figure: 1-cooling bed body, 2-heat collecting cover, 3-heat collecting main pipe, 4-waste heat boiler, 5-steam turbine, 6-generator, 7-heat collecting dust collector, 71-dust collecting cone, 72-heat collecting box, 73-filter, 74-drive motor, 75-scraper, 76-drive screw, 77-working box, 78-slider, 79-guide rod, 710-baffle, 711-ash receiving drawer, 712-support plate, 8-stabilizing tank, 81-stabilizing plate, 82-warm flow tube, 83-top plate, 84-guide hole, 85-air flow distribution plate, 86-air flow hole, 87-stabilizing cap, 88-pressure relief box, 89-sealing plug, 810-elastic member, 811-exhaust hole, 9-heat accumulator. DETAILED DESCRIPTION

[0011] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the scope of protection of the present invention.

[0012] like Figures 1 to 4As shown, the utility model includes a cooling bed body 1 and a plurality of heat collecting covers 2 arranged above the cooling bed body 1. The heat collecting covers 2 are used to collect the hot air generated during the cooling process of the cooling bed body 1. A heat collecting main pipe 3 is connected to the top of the plurality of heat collecting covers 2. The ends of the heat collecting main pipe 3 are connected to the waste heat boiler 4, the steam turbine 5 and the generator 6 in sequence. The waste heat boiler 4, the steam turbine 5 and the generator 6 are structures used in the prior art. A heat collecting dust collector 7 is provided between each heat collecting cover 2 and the heat collecting main pipe 3. The heat collecting dust collector 7 includes a dust collecting cone 71 and an installation A heat collecting box 72 is mounted on the top of the dust removal cone 71. A connecting hole is provided at the bottom of the heat collecting box 72. A filter screen 73 is installed in the connecting hole. A dust cleaning component that is in sliding contact with the filter screen 73 is installed in the dust removal cone 71. The dust cleaning component can clean the filter screen 73 regularly and can maintain the collection of hot air flow for a long time. A simmering tank 8 is provided between the heat collecting main pipe 3 and the waste heat boiler 4. A simmering component is provided in the simmering tank 8. A pressure relief component is provided on the top of the simmering tank 8. A heat accumulator 9 is provided between the waste heat boiler 4 and the steam turbine 5.

[0013] The working process of this device is as follows: in the process of the cooling bed body 1 for blowing and cooling the product, the hot air generated after absorbing heat is adsorbed and collected by the heat collecting cover 2 and first enters the heat collecting dust collector 7. After the hot air flow in the heat collecting dust collector 7 is filtered and intercepted by the filter screen 73, the oxide scale, dust and other impurities carried in the hot air can be intercepted, thereby reducing the content of the hot air, completely solving the problem of pipeline blockage. After the hot air after filtering and dust removal enters the heat collecting main pipe 3, it enters the stabilizing tank 8 through the heat collecting main pipe 3. The stabilizing tank 8 can buffer the hot air and stably enter the hot hot air flow in the stabilizing tank 8, thereby ensuring the stable flow of hot air entering the waste heat boiler 4, allowing the waste heat boiler 4 to generate stable steam. The steam generated by the waste heat boiler enters the heat accumulator 9 for storage, and then enters the steam turbine 5 to drive the generator 6 to generate electricity, thus ensuring the stable power generation of the generator 6, which can well improve the waste heat recovery efficiency and thus significantly improve the effect of waste heat power generation.

[0014] Furthermore, the dust cleaning assembly includes a drive motor 74, a scraper 75 and a transmission screw 76. The drive motor 74 is a structure used in the prior art and can be directly purchased according to the power size used. A working box 77 is installed on the outside of the dust removal cone 71. The transmission screw 76 is rotatably installed in the working box 77. The drive motor 74 is installed on the outside of the working box 77 and is transmission-connected to one end of the transmission screw 76. A slider 78 is installed on the slider 78 on the outside of the transmission screw 76. The guide rod 79 extending to the dust collection cone 71, the scraper 75 is installed at the end of the guide rod 79 and in sliding contact with the filter 73, a baffle 710 is horizontally installed in the dust collection cone 71 on the lower side of the scraper 75, and a gap is left between the baffle 710 and the dust collection cone 71. An ash drawer 711 is set in the dust collection cone 71 below the end of the baffle 710. The hot air sucked by the heat collection cover 2 first enters the dust collection cone 71. When the hot air enters the heat collection box 72 from the filter 73, the filter 73 can filter the impurities in the hot air. Filter, the impurities of the filtered material fall onto the baffle 710. When a certain thickness of impurities accumulates on the baffle 710, the drive motor 74 is turned on, and the drive motor 74 drives the transmission screw 76 to rotate. During the rotation of the transmission screw 76, it can drive the slider 78 to rotate. While the slider 78 rotates, it can drive the scraper 75 to move back and forth through the guide rod 79. During the movement of the scraper 75, the filter screen 73 can be cleaned, and the dust adhering to the filter screen 73 can be cleaned and discharged, thereby improving the filtration efficiency of the filter screen 73. On the other hand, the scraper 75 can scrape the dust accumulated on the baffle 710 into the dust collecting drawer 711. The dust collecting drawer 711 can be pulled out from the dust collecting cone 71 for cleaning by regularly pulling the dust collecting drawer 711. Preferably, in order to ensure the stability of the dust collecting drawer 711 during the pulling and pulling process, a support plate 712 is installed in the dust collecting cone 71 on the lower side of the dust collecting drawer 711, and a slide groove is symmetrically processed on the upper surface of the support plate 712. A slide rail matching the slide groove is installed at the bottom of the ash collecting drawer 711, and the slide rail is slidably installed in the slide groove.

[0015] Furthermore, in order to improve the use effect of the heat collecting dust collector 7, the dust collecting cone hopper 71 is a conical structure with a large upper end and a small lower end. The lower end of the dust collecting cone hopper 71 is connected to the heat collecting cover 2, and the heat collecting box 72 is a hollow structure inside. The top of the heat collecting box 72 is connected to the heat collecting main pipe 3 through a short pipe.

[0016] Furthermore, the flow stabilizing assembly includes a flow stabilizing plate 81 and a flow stabilizing tube 82. The flow stabilizing plate 81 is installed in the flow stabilizing tank 8 on the upper side of the heat collecting main pipe 3. There are multiple flow stabilizing tubes 82, and the multiple flow stabilizing tubes 82 are evenly distributed and vertically installed above the flow stabilizing plate 81. A top plate 83 is installed on the top of the flow stabilizing tube 82, and a plurality of guide holes 84 are evenly distributed on the tube wall of the flow stabilizing tube 82. After the hot air flow transported by the heat collecting main pipe 3 enters the flow stabilizing tank 8, the flow stabilizing plate 81 has a buffering effect, which can evenly distribute the hot air flow into each flow stabilizing tube 82, and then flow out through the guide holes 84 in each flow stabilizing tube 82. Without affecting the circulation of the hot air flow, the hot air flow can be made more stable, which can ensure that the hot air flow entering the waste heat boiler 4 is stable and uniform. Preferably, the warm flow component also includes an air flow distribution plate 85, which is installed in the flow stabilizing tank 8 above the flow stabilizing plate 81, and the upper end of the flow stabilizing tube 82 passes through the air flow distribution plate 85, and the guide holes 84 are arranged between the air flow distribution plate 85 and the flow stabilizing plate 81. The air flow distribution plate 85 is provided with a plurality of air flow holes 86. The hot air flow flowing out of the guide holes 84 can be buffered again after being distributed by the gas distribution plate 85, thereby further improving the stability of the hot air flow.

[0017] Furthermore, a flow stabilizing cap 87 is installed on the inner wall of the flow stabilizing tank 8 opposite to the heat collecting main pipe 3. The cross-section of the flow stabilizing cap 87 is an arc-shaped structure. A sewage pipe is provided at the bottom of the flow stabilizing tank 8, and a sewage valve is installed on the sewage pipe. The hot air flow entering the flow stabilizing tank 8 from the heat collecting main pipe 3 can reduce the flow rate of the hot air flow after being refracted by the flow stabilizing cap 87, so that the hot air flow is buffered by the flow stabilizing plate 81, making the flow rate of the hot air flow more uniform and stable.

[0018] Furthermore, in order to ensure the safety of the sprue tank 8 during use, the pressure relief assembly includes a pressure relief box 88 and a piston 89. The top of the sprue tank 8 is processed with a pressure relief hole. The pressure relief box 88 is installed on the top of the sprue tank 8 outside the pressure relief hole. The sealing plug 89 is movably installed in the pressure relief hole. The sealing plug 89 is connected to the top of the pressure relief box 88 by an elastic member 810. The elastic member 811 uses the spring structure used in the prior art. An exhaust hole 811 is provided on the side wall of the pressure relief box 88. When the air pressure in the sprue tank 8 is too high, the hot air flow will push the sealing plug 89 upward, and the elastic member 811 will be compressed, releasing a certain amount of hot air through the exhaust hole 811. When the air pressure in the sprue tank 8 returns to normal, the elastic member 811 will press the sealing plug 89 down again to close the pressure relief hole, effectively avoiding the danger caused by excessive pressure in the sprue tank 8.

Claims

1. A waste heat recovery device for a hot-rolled steel slab cooling bed, comprising a cooling bed body (1) and a plurality of heat collecting covers (2) arranged above the cooling bed body (1), a heat collecting main pipe (3) being connected above the plurality of heat collecting covers (2), and the ends of the heat collecting main pipe (3) being sequentially connected to a waste heat boiler (4), a steam turbine (5) and a generator (6), characterized in that: A heat collecting dust collector (7) is provided between each heat collecting cover (2) and the heat collecting main pipe (3), the heat collecting dust collector (7) comprising a dust collecting cone (71) and a heat collecting box (72) installed on the top of the dust collecting cone (71), a connecting hole is provided at the bottom of the heat collecting box (72), a filter screen (73) is installed in the connecting hole, a dust cleaning component that is in sliding contact with the filter screen (73) is installed in the dust collecting cone (71), a flow stabilizing tank (8) is provided between the heat collecting main pipe (3) and the waste heat boiler (4), a flow stabilizing component is provided in the flow stabilizing tank (8), a pressure relief component is provided on the top of the flow stabilizing tank (8), and a heat accumulator (9) is provided between the waste heat boiler (4) and the steam turbine (5).

2. The waste heat recovery device for a hot-rolled steel billet finished product cooling bed according to claim 1, characterized in that: The dust cleaning assembly includes a driving motor (74), a scraper (75) and a transmission screw (76). A working box (77) is installed on the outside of the dust removal cone (71). The transmission screw (76) is rotatably installed in the working box (77). The driving motor (74) is installed on the outside of the working box (77) and is transmission-connected to one end of the transmission screw (76). A slider (78) is installed on the transmission screw (76). A guide rod (79) extending into the dust removal cone hopper (71) is mounted on the slider (78); the scraper (75) is mounted on the end of the guide rod (79) and is in sliding contact with the filter screen (73); a baffle (710) is horizontally mounted in the dust removal cone hopper (71) below the scraper (75); a gap is left between the baffle (710) and the dust removal cone hopper (71); and a dust receiving drawer (711) is arranged in the dust removal cone hopper (71) below the end of the baffle (710).

3. The waste heat recovery device for a hot-rolled steel billet finished product cooling bed according to claim 1, characterized in that: A support plate (712) is installed in the dust removal cone hopper on the lower side of the ash receiving drawer (711), and a slide groove is symmetrically processed on the upper surface of the support plate (712). A slide rail matching the slide groove is installed at the bottom of the ash receiving drawer (711), and the slide rail is slidably installed in the slide groove.

4. The waste heat recovery device for a hot-rolled steel billet finished product cooling bed according to claim 1, characterized in that: The dust removal cone hopper (71) is a cone structure with a large upper end and a small lower end. The lower end of the dust removal cone hopper (71) is connected to the heat collection cover (2). The heat collection box (72) is a hollow structure. The top of the heat collection box (72) is connected to the heat collection main pipe (3) through a short pipe.

5. The waste heat recovery device for a hot-rolled steel billet finished product cooling bed according to claim 1, characterized in that: The flow stabilizing assembly comprises a flow stabilizing plate (81) and a flow stabilizing tube (82). The flow stabilizing plate (81) is installed in a flow stabilizing tank (8) on the upper side of the heat collecting main pipe (3). There are multiple flow stabilizing tubes (82). The multiple flow stabilizing tubes (82) are evenly distributed and vertically installed above the flow stabilizing plate (81). A top plate (83) is installed on the top of the flow stabilizing tube (82). A plurality of flow guide holes (84) are evenly distributed on the tube wall of the flow stabilizing tube (82).

6. The waste heat recovery device for a hot-rolled steel billet finished product cooling bed according to claim 5, characterized in that: The warm flow assembly further comprises an air flow distribution plate (85), the air flow distribution plate (85) being mounted in a flow stabilizing pot (8) above the flow stabilizing plate (81), the upper end of the flow stabilizing tube (82) being arranged through the air flow distribution plate (85), and the guide hole (84) being arranged between the air flow distribution plate (85) and the flow stabilizing plate (81), and a plurality of air flow holes (86) being arranged on the air flow distribution plate (85).

7. The waste heat recovery device for a hot-rolled steel billet finished product cooling bed according to claim 1, characterized in that: A flow stabilizing cap (87) is installed on the inner wall of the flow stabilizing tank (8) opposite to the heat collecting main pipe (3). The cross section of the flow stabilizing cap (87) is an arc-shaped structure. A sewage pipe is provided at the bottom of the flow stabilizing tank (8), and a sewage valve is installed on the sewage pipe.

8. The waste heat recovery device for a hot-rolled steel billet finished product cooling bed according to claim 1, characterized in that: The pressure relief assembly comprises a pressure relief box (88) and a piston (89); a pressure relief hole is processed on the top of the slurry tank (8); the pressure relief box (88) is installed on the top of the slurry tank (8) outside the pressure relief hole; the sealing plug (89) is movably installed in the pressure relief hole; the sealing plug (89) is connected to the top of the pressure relief box (88) via an elastic member (810); and an exhaust hole (811) is provided on the side wall of the pressure relief box (88).

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