Mineral aggregate cooling chute device with waste heat recovery function

Abstract

The mineral aggregate cooling chute device with the waste heat recovery function is arranged between a discharging port of a crusher and a feeding port of an annular cooler, the chute device comprises a barrel with an upper end opening and a lower end opening, the upper end opening is provided with a partition part, and the partition part divides the upper end opening into a mineral aggregate inlet and a hot air outlet; the lower end opening of the chute device is a mineral aggregate outlet, the hot air outlet is sequentially connected with an induced draft fan and a dust remover, the outlet end of the dust remover is connected to a high-temperature exhaust pipeline of the high-temperature section of the circular cooler, and a liquid-cooled spiral heat exchange pipe is arranged on the wall of the barrel. And the liquid-cooled spiral heat exchange tube is spirally wound at the lower part of the cylinder. The energy consumption in the production process of the sintering machine can be effectively reduced, the energy utilization efficiency is improved, dependence on external energy is reduced, and therefore the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery, and specifically relates to a mineral material cooling chute device with waste heat recovery function. Background Art

[0002] The function of the sintering ring cooler is to quickly cool the high-temperature sintered ore and form sintered blocks. During the cooling process, the sintering ring cooler will generate a large amount of waste heat. Studies have shown that the cooling waste gas discharged from the top of the ring cooler accounts for 40% to 45% of the waste heat resources of the entire sintering process, and is one of the main parts for waste heat recovery and utilization.

[0003] At present, the domestic waste heat recovery method is mainly based on the energy quality of the exhaust pipes of different temperature sections of the ring cooler, and the energy conversion and utilization is carried out in a step-by-step manner. The current technology has used the waste heat power generation of the high-temperature exhaust gas of the first and second sections of the ring cooler, and adopted the flue gas recirculation technology to convert the energy of the third section of the ring cooler; for the low-temperature exhaust gas in the latter section, due to the relevant requirements of ultra-low emissions of atmospheric pollutants in the steel industry, various steel companies have carried out research on zero emission of waste gas from ring coolers, and recycled a large amount of low-temperature exhaust gas at the end of the ring cooler through relevant technologies, realizing the full ring cooling waste heat utilization of the ring cooler and reducing pollutant emissions.

[0004] The technology of full-circular cooling waste heat utilization of ring coolers is currently in its infancy in China. Most companies are making modifications based on existing equipment. In the process of realizing full-circular cooling waste heat utilization of ring coolers, since the low-temperature exhaust gas after waste heat utilization is recycled back to the ring cooler through the fan for reuse, the cold source of some fans is replaced by low-temperature exhaust gas with a certain temperature instead of the previous cold air. It is generally difficult to ensure the mine temperature requirement (generally below 120°C) under the premise of full-circular cooling. It is necessary to increase the power of other blowers to ensure the temperature requirement of the ore, resulting in high fan energy consumption and high equipment cost. Utility Model Content

[0005] In order to further reduce fan energy consumption and equipment costs during the utilization of waste heat from sintering ring coolers. This application changes the existing layout and cooling method of sintered ore, and considers pre-cooling the sintered ore in the chute area from the discharge port of the single-roll crusher to the feed port of the ring cooler. Studies have shown that the temperature of the ore in this section can be as high as 700°C or above, and the high-temperature ore in this chute section can be well pre-cooled by the chute device proposed in this application. The solution proposed in this application can significantly improve energy consumption in the steel production process.

[0006] The technical solutions adopted are as follows:

[0007] A ore cooling chute device with waste heat recovery function is arranged between the discharge port of a crusher and the feed port of a ring cooler. The chute device comprises a cylinder with upper and lower openings, and the upper opening has a partition, the partition divides the upper opening into an ore inlet and a hot air outlet, and the lower opening of the chute device is an ore outlet.

[0008] The hot air outlet is connected to the induced draft fan and the dust collector in sequence, and the outlet end of the dust collector is connected to the high-temperature exhaust pipeline of the high-temperature section of the ring cooler.

[0009] Wherein, a liquid-cooled spiral heat exchange tube is arranged on the cylinder wall of the cylinder, and the liquid-cooled spiral heat exchange tube is spirally coiled at the lower part of the cylinder.

[0010] Optionally, the mineral material inlet is formed by opening from the upper side wall of the cylinder and extending through an upwardly inclined pipeline, and the liquid-cooled spiral heat exchange tube is spirally coiled on the outer wall of the cylinder below the mineral material inlet.

[0011] Optionally, the upper end of the mineral material inlet expands outwardly into a trumpet shape.

[0012] Optionally, a side wall of the mineral material outlet on one side of the mineral material inlet extends obliquely toward the other side, so that the mineral material outlet shrinks and becomes smaller.

[0013] Optionally, there is cooling water in the liquid-cooled spiral heat exchange tube, the water inlet of the liquid-cooled spiral heat exchange tube is connected to the water outlet of the circulation pump, the water inlet of the circulation pump is connected to the water outlet of the waste heat utilization equipment, and the water inlet of the waste heat utilization equipment is connected to the water outlet of the liquid-cooled spiral heat exchange tube.

[0014] Optionally, a first vertical wear-resistant baffle extends from a side of the hot air outlet close to the mineral material inlet.

[0015] Optionally, a second wear-resistant baffle is further provided on the inner wall of the spirally wound cylinder wall of the liquid-cooled spiral heat exchange tube.

[0016] Optionally, the second wear-resistant baffle is arranged on the inner wall of the cylinder below the hot air outlet.

[0017] Optionally, the ring cooler is divided into a high-temperature section, a medium-temperature section and a low-temperature section in sequence, the high-temperature exhaust pipeline of the high-temperature section is connected to the waste heat boiler system, the boiler exhaust pipeline of the waste heat boiler system is connected to the cold air inlet of the high-temperature section, and the cold air outlet of the blower is connected to the cold air inlets of the medium-temperature section and the low-temperature end.

[0018] Optionally, a liquid-cooled spiral heat exchange tube is provided on the outer wall of the cylinder.

[0019] The utility model discloses a ore cooling chute device with waste heat recovery function, which can effectively reduce the energy consumption in the production process of the sintering machine, improve the energy utilization efficiency, reduce the dependence on external energy, and thus achieve the purpose of energy saving and emission reduction.

[0020] The utility model of the ore cooling chute device with waste heat recovery function has the following beneficial effects:

[0021] (1) The high-temperature exhaust gas with high dust content is sent to the high-temperature exhaust pipe of the ring cooler through the induced draft fan to participate in the waste heat utilization. As the high-temperature exhaust gas is extracted, the temperature of the gap between the ore materials is reduced, which also reduces the temperature of the surface of the ore materials, which helps to pre-cool the ore materials.

[0022] (2) When the ore enters the ring cooler through the chute device, it exchanges heat with the coolant in the heat exchange pipeline, thereby pre-cooling the ore passing through the chute device, thereby reducing the temperature of a large amount of low-temperature exhaust gas at the end of the ring cooler. In this case, even in the process of realizing the full ring cooling waste heat utilization of the ring cooler, the low-temperature exhaust gas after the waste heat utilization of the waste heat boiler system is circulated back to the ring cooler through the blower for reuse, and the cold source of some blowers is replaced by low-temperature exhaust gas with a certain temperature instead of the previous cold air. However, since the present application pre-cools the ore in the chute device, the temperature of the low-temperature exhaust gas at the end of the ring cooler is also reduced, thereby ensuring the temperature requirements of the ore without increasing the power of other blowers.

[0023] (3) A first wear-resistant baffle is provided in the chute device to change the angle of the ore-falling feed, effectively preventing the ore-falling feed port from directly impacting and abrading the inner wall of the cylinder due to inertia, effectively reducing the maintenance and replacement frequency of the cylinder wall, and improving the reliability and stability of the equipment.

[0024] (4) A second wear-resistant baffle is provided in the chute device to reduce the outflow speed of the ore material just above the discharge port, reduce the wear of the ore material on the inner wall of the cylinder wall, and prolong the heat exchange time between the ore material and the liquid-cooled spiral heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By describing the embodiments thereof in conjunction with the following drawings, the above-mentioned features and technical advantages of the present utility model will become clearer and easier to understand.

[0026] Figure 1 It is a schematic diagram of the layout of a mineral material cooling chute device with waste heat recovery function according to an embodiment of the utility model.

[0027] Figure 2 It is a schematic diagram of a mineral material cooling chute device with waste heat recovery function according to an embodiment of the utility model. DETAILED DESCRIPTION

[0028] The embodiments of the present invention will be described below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that the described embodiments may be modified in various ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims. In addition, in this specification, the drawings are not drawn to scale and the same reference numerals represent the same parts.

[0029] like Figure 1 As shown, the ore cooling chute device with waste heat recovery function of this embodiment is arranged between the discharge port of the single-roll crusher 1 and the feed port of the ring cooler 8. The single-roll crusher 1 is used to transport the crushed ore to the chute device 2, and the ring cooler is used to cool the ore through the blower 7. The chute device 2 includes a cylinder and a heat exchange pipeline arranged on the cylinder. The heat exchange pipeline has a heat exchange medium, such as cooling water. The water inlet of the heat exchange pipeline is connected to the water outlet of the circulation pump, the water inlet of the circulation pump is connected to the water outlet of the waste heat utilization device, and the water inlet of the waste heat utilization device is connected to the water outlet of the heat exchange pipeline.

[0030] The cooling water in the heat exchange pipeline is forced to circulate through a circulating pump, and the ore and the cooling water in the heat exchange pipeline exchange heat. The cooling water absorbs heat to achieve the purpose of pre-cooling the hot ore. The hot water in the heat exchange pipeline can be used to heat water or air and other energy needs in the production process.

[0031] The waste heat generated by the sintering machine 9 causes the ore to carry a large amount of heat. In the process of the ore passing through the chute device and entering the ring cooler, the ore exchanges heat with the coolant in the heat exchange pipeline, thereby pre-cooling the ore passing through the chute device, thereby reducing the temperature of a large amount of low-temperature exhaust gas at the end of the ring cooler. In this case, even in the process of realizing the full ring cooling waste heat utilization of the ring cooler, the low-temperature exhaust gas after the waste heat utilization of the waste heat boiler system 10 is circulated back to the ring cooler through the blower for reuse, and the cold source of part of the blower 7 is replaced by the low-temperature exhaust gas with a certain temperature instead of the previous cold air. However, since this embodiment pre-cools the ore in the chute device, the temperature of the low-temperature exhaust gas at the end of the ring cooler is also reduced, thereby ensuring the temperature requirement of the ore, that is, the ore temperature requirement (generally below 120°C) can be ensured without increasing the power of other blowers 7.

[0032] like Figure 1As shown, the chute device 2 is arranged between the discharge port of the single-roll crusher 1 and the feed port of the ring cooler 8. The single-roll crusher 1 is used to transport the crushed ore to the chute device 2. The ring cooler uses air cooling to cool the ore. The ring cooler is divided into one section, two sections, three sections, and four sections according to the temperature. The first and second sections are high-temperature sections, the third section is a medium-temperature section, and the fourth section is a low-temperature section. The ore is cooled in turn through the high-temperature section, the medium-temperature section, and the low-temperature section. Each section discharges hot air after heat exchange. The high-temperature exhaust pipeline of the high-temperature section is connected to the waste heat boiler system, and the boiler exhaust pipeline of the waste heat boiler system is connected to the cold air inlet of the high-temperature section. The high-temperature gas in the high-temperature exhaust pipeline exchanges heat with the boiler water in the waste heat boiler system. After heat exchange, the high-temperature gas is cooled to become low-temperature exhaust gas. The low-temperature exhaust gas enters the high-temperature section and exchanges heat with the ore in the high-temperature section to discharge high-temperature gas. The medium-temperature section and the low-temperature end of the ring cooler 8 cool the ore through the blower 7. The pipelines in the medium temperature section are connected to the flue gas circulation system, and participate in hot air sintering, hot air ignition and combustion, or sintering mixed material drying, etc. The pipelines in the low temperature section are connected to the heat exchanger, and participate in preheating boiler feed water, preheating mixed material water or heating, etc.

[0033] like Figure 2 As shown, the chute device 2 includes a cylinder 20 with upper and lower openings, wherein the upper opening is larger than the lower opening, and the upper opening has a partition 26, wherein the partition 26 divides the upper opening into a material inlet 251 and a hot air outlet 252, and the lower opening of the chute device 2 is a material outlet 253. The hot air outlet 252 is connected to the induced draft fan 5 and the dust collector 6 in sequence, and the outlet end of the dust collector 6 is connected to the high-temperature exhaust pipes discharged from the first and second stages of the ring cooler 8. During the process of the ore passing through the chute device, the gap between the ore also contains a large amount of high-temperature exhaust gas. The high-temperature exhaust gas with a high dust content is first dedusted by the induced draft fan 5 under the action of the induced draft fan 5 and then sent to the high-temperature exhaust pipe of the ring cooler to participate in the waste heat utilization. Moreover, since the high-temperature exhaust gas is drawn away, the temperature of the gap between the ore is reduced, which also reduces the temperature of the surface of the ore, which is helpful for pre-cooling of the ore. The specific recycling process of the waste heat boiler system is not described in detail here.

[0034] Among them, a heat exchange pipeline is arranged on the cylinder wall of the cylinder 20 of the chute device 2, and the heat exchange pipeline is a liquid-cooled spiral heat exchange tube 21, and the liquid-cooled spiral heat exchange tube 21 is spirally coiled on the lower part of the cylinder 20. More specifically, the mineral inlet 251 is formed by opening from the upper side wall of the cylinder 20 and extending through an upwardly inclined pipeline. Moreover, the upper end of the mineral inlet 251 expands outwardly into a trumpet shape to increase the amount of mineral received. The liquid-cooled spiral heat exchange tube 21 is spirally coiled on the outer wall of the cylinder below the mineral inlet 251. The side wall of the mineral outlet 253 on one side of the mineral inlet 251 extends obliquely to the other side to form an inclined side wall 254, so that the mineral outlet 253 shrinks and becomes smaller.

[0035] There is cooling water in the liquid-cooled spiral heat exchange tube 21, the water inlet of the liquid-cooled spiral heat exchange tube 21 is connected to the water outlet of the circulation pump 4, the water inlet of the circulation pump 4 is connected to the water outlet of the waste heat utilization device 3, and the water inlet of the waste heat utilization device 3 is connected to the water outlet of the liquid-cooled spiral heat exchange tube 21. The liquid-cooled spiral heat exchange tube 21 pre-cools the mineral material passing through its coiled cylinder by cooling water.

[0036] The hot air outlet 252 extends a vertical first wear-resistant baffle 22 on one side close to the ore inlet 251, preferably in the shape of a triangle with the pointed corner facing downward. A second wear-resistant baffle 23 is also provided on the inner wall of the spirally wound cylinder wall of the liquid-cooled spiral heat exchange tube 21. The first wear-resistant baffle is used to effectively prevent the ore feed port from directly causing impact wear on the inner wall of the cylinder wall due to inertia by changing the angle of the falling ore feed, effectively reducing the maintenance and replacement frequency of the cylinder wall, and improving the reliability and stability of the equipment. The second wear-resistant baffle 23 is provided on the inner wall of the cylinder wall below the hot air outlet 252.

[0037] The second wear-resistant baffle 23 extends horizontally with the inner wall of the cylinder, and its upper surface gradually tilts downward in the direction away from the inner wall of the cylinder. The second wear-resistant baffle 23 can reduce the outflow speed of the part of the ore just above the discharge port, reduce the wear of the ore on the inner wall of the cylinder, and can also lengthen the heat exchange time between the ore and the liquid-cooled spiral heat exchange tube 21, so as to achieve the purpose of fully pre-cooling the ore.

[0038] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A mineral material cooling chute device with waste heat recovery function, arranged between the discharge port of the crusher and the feed port of the ring cooler, characterized in that: The chute device comprises a cylinder with upper and lower openings, and the upper opening has a partition, the partition divides the upper opening into a mineral material inlet and a hot air outlet, and the lower opening of the chute device is the mineral material outlet. The hot air outlet is connected to the induced draft fan and the dust collector in sequence, and the outlet end of the dust collector is connected to the high-temperature exhaust pipeline of the high-temperature section of the ring cooler, wherein a liquid-cooled spiral heat exchange tube is arranged on the cylinder wall, and the liquid-cooled spiral heat exchange tube is spirally coiled on the lower part of the cylinder.

2. The ore cooling chute device with waste heat recovery function according to claim 1 is characterized in that: The mineral material inlet is formed by opening from the upper side wall of the cylinder and extending out through an upwardly inclined pipeline, and the liquid-cooled spiral heat exchange tube is spirally coiled on the outer wall of the cylinder below the mineral material inlet.

3. The ore material cooling chute device with waste heat recovery function according to claim 1 is characterized in that: The upper end of the ore inlet expands outwards into a trumpet shape.

4. The ore cooling chute device with waste heat recovery function according to claim 1 is characterized in that: The side wall of the mineral material outlet on one side of the mineral material inlet is inclined and extends toward the other side, so that the mineral material outlet shrinks and becomes smaller.

5. The ore cooling chute device with waste heat recovery function according to claim 1 is characterized in that: There is cooling water in the liquid-cooled spiral heat exchange tube, the water inlet of the liquid-cooled spiral heat exchange tube is connected to the water outlet of the circulation pump, the water inlet of the circulation pump is connected to the water outlet of the waste heat utilization equipment, and the water inlet of the waste heat utilization equipment is connected to the water outlet of the liquid-cooled spiral heat exchange tube.

6. The ore cooling chute device with waste heat recovery function according to claim 1 is characterized in that: A vertical first wear-resistant baffle extends from one side of the hot air outlet close to the mineral material inlet.

7. The ore material cooling chute device with waste heat recovery function according to claim 1 is characterized in that: A second wear-resistant baffle is also arranged on the inner wall of the spirally wound cylinder of the liquid-cooled spiral heat exchange tube.

8. The ore material cooling chute device with waste heat recovery function according to claim 7 is characterized in that: The second wear-resistant baffle is arranged on the inner wall of the cylinder below the hot air outlet.

9. The ore material cooling chute device with waste heat recovery function according to claim 1, characterized in that: The ring cooler is divided into a high temperature section, a medium temperature section and a low temperature section in sequence. The high temperature exhaust pipeline of the high temperature section is connected to the waste heat boiler system, the boiler exhaust pipeline of the waste heat boiler system is connected to the cold air inlet of the high temperature section, and the cold air outlet of the blower is connected to the cold air inlets of the medium temperature section and the low temperature end.

10. The ore material cooling chute device with waste heat recovery function according to claim 1, characterized in that: A liquid-cooled spiral heat exchange tube is arranged on the outer wall of the cylinder.

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