Waste heat recovery device for preparing zinc oxide from zinc-containing ash and production process

Abstract

The invention relates to the technical field of zinc oxide preparation equipment, and provides a waste heat recovery device for preparing zinc oxide from zinc-containing ash and a production process, the waste heat recovery device comprises a heat exchange chamber, a cold water pipe and an impurity removal unit, the impurity removal unit is arranged on the outer wall of the cold water pipe, and the impurity removal unit comprises an impurity removal base frame and an impurity removal plate; the heat exchange chamber is used for circulation of hot air; the parallel cold water pipes are arranged in the heat exchange chamber, the extending direction of the cold water pipes is parallel to the circulation direction of hot air, and the flowing direction of cold water in the cold water pipes is opposite to the circulation direction of the hot air. The impurity removal base frame is slidably arranged on the outer wall of the cold water pipe along the axis of the cold water pipe. The impurity removing plate rotates around the axis of the cold water pipe and is connected to the impurity removing base frame. The impurity removing plate is used for removing impurities attached to the outer wall of the cold water pipe. Through the technical scheme, the problems of high energy consumption and low comprehensive utilization rate in the cooling treatment process of the zinc-containing ash powder in related technologies are solved. The comprehensive utilization rate of heat is improved, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of zinc oxide preparation, in particular, to a waste heat recovery device for preparing zinc oxide from zinc-containing ash and a production process. BACKGROUND

[0002] Zinc oxide (also known as zinc oxide powder, zinc white, and zinc white powder) is a white solid inorganic compound and a form of zinc oxide. Zinc oxide is widely used in the production of plastics, silicate products, synthetic rubber, lubricating oil, paint, ointment, adhesive, food, battery, and flame retardant.

[0003] Zinc oxide is generally prepared from zinc ore, which is relatively high in cost. Considering that a large amount of zinc-containing ash is generated in steel plants every day, a technical research on preparing zinc oxide from zinc-containing ash is proposed, which reduces the dependence on zinc ore as raw material for the preparation of zinc oxide and thus reduces the cost of raw materials for the preparation of zinc oxide. In the preparation process, a large amount of energy is consumed in multiple treatment steps such as heating and cooling of the zinc-containing ash. When the zinc-containing ash is treated, it is heated to a certain temperature first, and part of the components are gasified and volatilized. The gaseous components volatilized are cooled in the cooling chamber by using a cooling device. However, the gaseous components volatilized have a certain viscosity and are easily adhered to the outer layer of the cooling device. With the accumulation of time, the thickness of the adhered layer increases, which reduces the cooling effect. Therefore, it is necessary to improve and optimize the existing technology, improve the cooling effect and the comprehensive utilization rate of energy, reduce energy consumption, and further achieve cost reduction and efficiency improvement in combination with the current development trend of the country. SUMMARY

[0004] To overcome the above defects, embodiments of the present application provide a waste heat recovery device for preparing zinc oxide from zinc-containing ash and a production process, which solves the problems of large energy consumption and low comprehensive utilization rate in the related art during the cooling treatment of zinc-containing ash.

[0005] According to one aspect, at least one embodiment of the present application provides a waste heat recovery device for preparing zinc oxide from zinc-containing ash, comprising: a heat exchange chamber for the flow of hot gas; a plurality of cold water pipes arranged in parallel with each other in the heat exchange chamber, the extension direction of the cold water pipes being parallel to the flow direction of the hot gas, and the flow direction of the cold water in the cold water pipes being opposite to the flow direction of the hot gas; a dedusting unit arranged on the outer wall of the cold water pipe, the dedusting unit comprising: a dedusting base frame, and the cold water pipe is slidingly arranged on the outer wall of the cold water pipe; A decontamination plate is arranged on the decontamination base, and is used to remove the impurities adhered to the outer wall of the cold water pipe.

[0006] For example, the waste heat recovery device for preparing zinc oxide from zinc-containing ash slag provided by at least one embodiment of the present application comprises a decontamination unit, which comprises: Two spades are coaxially hinged to one end of the decontamination plate close to the cold water pipe, and the two spades are symmetrically distributed on both sides of the decontamination plate. The spades are arc-shaped.

[0007] For example, the waste heat recovery device for preparing zinc oxide from zinc-containing ash slag provided by at least one embodiment of the present application further comprises a transmission unit, which comprises: A rotating frame is arranged on the decontamination base, and the decontamination plate is slidingly arranged on the rotating frame in the radial direction of the cold water pipe. The decontamination plate has a pressed inclined surface. A sliding pressing block is slidingly arranged on the rotating frame and has a pressing inclined surface. After sliding, the pressing inclined surface of the sliding pressing block is arranged to press against the pressed inclined surface of the decontamination plate, so that the decontamination plate is close to the outer wall of the cold water pipe.

[0008] For example, the waste heat recovery device for preparing zinc oxide from zinc-containing ash slag provided by at least one embodiment of the present application comprises a decontamination unit, which comprises: A misaligned rotating disc is coaxially arranged on the decontamination base and coaxially arranged with the rotating frame. A pressing block is arranged on one side of the misaligned rotating disc close to the rotating frame. The pressing block is arranged to press against the sliding pressing block under the rotation of the misaligned rotating disc, so that the sliding pressing block is close to the decontamination plate.

[0009] For example, the waste heat recovery device for preparing zinc oxide from zinc-containing ash slag provided by at least one embodiment of the present application comprises a decontamination unit, which comprises: Transmission gears one and two are coaxially arranged on the decontamination base. A toothed belt one is arranged on the outer periphery of the misaligned rotating disc and is meshingly connected with the transmission gear one. A toothed belt two is arranged on the outer periphery of the rotating frame and is meshingly connected with the transmission gear two.

[0010] For example, the waste heat recovery device for preparing zinc oxide from zinc-containing ash slag provided by at least one embodiment of the present application further comprises a blade opening unit, which comprises: A blade opening sliding member is slidingly arranged on the decontamination plate. Two connecting rods are coaxially hinged to the blade opening sliding member. The other ends of the two connecting rods away from the coaxial hinge are respectively hinged to the two spades one by one. The edged slide is configured to slide closer to or away from the cold water pipe, and at the same time the edged slide drives the two connecting rods to make the two connecting rods converge toward the middle or push the two shovel blades toward both sides.

[0011] For example, in a waste heat recovery device for preparing zinc oxide from zinc-containing ash provided by at least one embodiment of the present invention, the sharpening sliding member is provided with a roller for rotation at one end away from the connecting rod, and the sharpening unit further comprises: a lifting block, provided on the sliding pressure block and having a lifting inclined surface, wherein the lifting block is configured to slide synchronously with the sliding of the sliding pressure block, so that the lifting inclined surface presses against the roller and drives the edged sliding member to slide in a direction away from the cold water pipe; A reset elastic member has one end acting on the edged sliding member and the other end acting on the debris removing plate. The reset elastic member is used to provide a force to make the edged sliding member close to the cold water pipe.

[0012] For example, in at least one embodiment of the present invention, a waste heat recovery device for preparing zinc oxide from zinc-containing ash further includes an unlocking unit, wherein the unlocking unit includes: An unlocking block is provided on the sliding pressing block away from the end of the impurity removing plate, and the unlocking block has an arc-shaped sliding surface on a side close to the sliding pressing block; An unlocking rocker arm, one end of which is hinged to the offset turntable and the other end of which is provided with an unlocking lever; a torsional elastic member, one end of which acts on the unlocking rocker and the other end of which acts on the dislocation turntable; Wherein, the unlocking rocker arm is configured to be driven by the rotation of the offset turntable so that the unlocking rod is pressed against the arc-shaped sliding surface and drives the sliding pressure block away from the debris removal plate.

[0013] For example, in at least one embodiment of the present invention, a waste heat recovery device for preparing zinc oxide from zinc-containing ash is provided, wherein the impurity removal base frame has an open rope clamping groove, and the waste heat recovery device for preparing zinc oxide from zinc-containing ash further includes a drive unit, wherein the drive unit includes: A driving rope, detachably clamped in the rope clamping slot; There are two limiting rope blocks, both of which are arranged on the driving rope, and the two limiting rope blocks are respectively located on both sides of the rope slot.

[0014] According to one aspect, at least one embodiment of the present invention provides a production process for preparing zinc oxide from zinc-containing ash, which uses the aforementioned waste heat recovery device for preparing zinc oxide from zinc-containing ash to perform the operation, comprising the following steps: Step S1: ash loading; Step S2: The rotary kiln is used for high-temperature diversion to form gaseous and solid materials; Step S3: The gaseous material is driven by induced draft and enters the heat exchange chamber for heat exchange and cooling treatment to obtain solid dust; Step S4: pickling the solid dust to obtain a variety of metal elements, and separating them one by one; Step S5: gradually heating sulfuric acid and sodium carbonate in the separated zinc powder to finally obtain zinc carbonate; Step S6: calcining zinc carbonate at high temperature to obtain zinc oxide; Step S7: The solid material is cooled and magnetically separated to obtain iron powder and slag tailings. The iron powder is recovered and the slag tailings are used to make ceramsite for other uses. Wherein, the step S3 and the step S7 are performed simultaneously.

[0015] The beneficial effects of the embodiments of the present invention are: In the present invention, the direction of cold water flow in the cold water pipe is opposite to the direction of hot air flow, forming a countercurrent heat exchange structure, which improves the heat exchange efficiency, fully recovers the waste heat in the hot air, and reduces energy consumption. The setting of the impurity removal unit can promptly remove impurities attached to the outer wall of the cold water pipe, avoid the increase in thermal resistance caused by the thickening of the impurity layer, ensure continuous and efficient heat exchange performance, and extend the service life of the equipment. The sliding of the impurity removal base along the axis of the cold water pipe and the rotation of the impurity removal plate around the axis of the cold water pipe enable the impurity removal action to cover the entire outer surface of the cold water pipe, ensuring the comprehensiveness of the impurity removal effect. This structural design realizes automatic impurity removal of the cold water pipe through simple and effective mechanical movement, without the need for an additional complex control system, reducing the maintenance cost and operation difficulty of the equipment. Through the synergistic effect of waste heat recovery and impurity removal functions, the waste heat recovery device solves the problems of high energy consumption and low comprehensive utilization rate in the cooling treatment process of zinc ash powder in the related technology, improves the comprehensive utilization efficiency of energy, and achieves the goal of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of point A in the embodiment of FIG; Figure 3 for Figure 1 A schematic structural diagram of the junction of the cold water pipe, the impurity removal unit and the transmission unit in the embodiment; Figure 4 for Figure 3 A structural diagram of another embodiment of the present invention; Figure 5 for Figure 4 A partial enlarged view of position B in the embodiment of FIG; In the figure: 1. heat exchange chamber, 2. cold water pipe, 3. impurity removal unit, 31. impurity removal base frame, 311. rope slot, 32. impurity removal plate, 321. pressed inclined surface, 33. shovel blade, 4. transmission unit, 41. rotating frame, 42. sliding pressure block, 421. extrusion inclined surface, 43. offset turntable, 44. top pressure block, 45. transmission gear 1, 46. transmission gear 2, 47. toothed belt 1, 48. toothed belt 2, 5. blade unit, 51. blade sliding member, 52. connecting rod, 53. roller, 54. lifting block, 541. lifting inclined surface, 55. reset elastic member, 6. unlocking unit, 61. unlocking block, 611. arc-shaped sliding surface, 62. unlocking rocker, 63. unlocking rod, 64. torsional elastic member, 7. driving unit, 71. driving rope, 72. limiting rope block. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0019] To simplify the drawings, only the parts relevant to the disclosure are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0020] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0021] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0022] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0023] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] like Figures 1 to 5 The figure shows a waste heat recovery device for producing zinc oxide from zinc-containing ash according to one embodiment of the present invention. The heat exchange chamber 1 is a horizontally laid, long cylindrical structure. The figure shows only the cylindrical perimeter wall, not the end plates. A channel for hot gas circulation is formed within the heat exchange chamber 1. Several cold water pipes 2 are arranged parallel to the hot gas flow direction within the heat exchange chamber 1. The cold water pipes 2 extend parallel to the hot gas flow direction, and the cold water in the cold water pipes 2 flows in the opposite direction of the hot gas flow.

[0025] The impurity removal unit 3 is mounted on the outer wall of the cold water pipe 2. Its annular frame 31 is fitted around the outer wall of the cold water pipe 2. The frame 31 can be assembled in multiple sections for easy assembly and disassembly. The frame 31 slides along the axis of the cold water pipe 2. A de-dusting plate 32 is connected to the frame 31 via a rotating mechanism at one end, allowing it to rotate around the axis of the cold water pipe 2. The inner surface of the de-dusting plate 32 faces the outer wall of the cold water pipe 2, removing impurities adhering to the outer wall of the cold water pipe 2.

[0026] When hot gases generated during the zinc-containing ash treatment process enter the heat exchange chamber 1, they exchange heat with the cold water in the cold water pipe 2, recovering waste heat. During this heat exchange process, some gaseous components adhere to the outer wall of the cold water pipe 2. At this point, the impurity removal base 31 is driven to slide along the axis of the cold water pipe 2, driving the impurity removal plate 32 to rotate. The inner curved surface of the impurity removal plate 32 contacts the outer wall of the cold water pipe 2, scraping off the attached impurities.

[0027] The setting in which the flow direction of cold water in the cold water pipe 2 is opposite to the flow direction of hot air forms a countercurrent heat exchange structure, which improves the heat exchange efficiency, fully recovers the waste heat in the hot air, and reduces energy consumption. The setting of the impurity removal unit 3 can promptly remove impurities attached to the outer wall of the cold water pipe 2, avoid the increase in thermal resistance caused by the thickening of the impurity layer, ensure continuous and efficient heat exchange performance, and extend the service life of the equipment. The sliding of the impurity removal base 31 along the axis of the cold water pipe 2 and the rotation of the impurity removal plate 32 around the axis of the cold water pipe 2 enable the impurity removal action to cover the entire outer surface of the cold water pipe 2, ensuring the comprehensiveness of the impurity removal effect. This structural design realizes automatic impurity removal of the cold water pipe 2 through simple and effective mechanical movement, without the need for an additional complex control system, reducing the maintenance cost and operating difficulty of the equipment. Through the synergistic effect of waste heat recovery and impurity removal functions, the waste heat recovery device solves the problems of high energy consumption and low comprehensive utilization rate in the cooling process of zinc ash powder in related technologies, improves the comprehensive utilization efficiency of energy, and achieves the goal of reducing costs and increasing efficiency.

[0028] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, two scraping edges 33 are coaxially hinged to the end of the debris removal plate 32 near the cold water pipe 2. The hinge axis extends along the axis of the cold water pipe 2, and the two scraping edges 33 are symmetrically distributed on either side of the debris removal plate 32. Each scraping edge 33 is generally arc-shaped, with the inner side of the arc facing the outer wall of the cold water pipe 2, and the curvature of the arc matches the curvature of the outer wall of the cold water pipe 2.

[0029] As the debris removal plate 32 rotates about and slides along the axis of the cold water pipe 2, the curved inner sides of the two scraping edges 33 contact the outer wall of the cold water pipe 2. Because the scraping edges 33 are hinged to the debris removal plate 32, they adapt to the curvature of the outer wall of the cold water pipe 2 during contact, ensuring that the curved inner sides always conform to the outer wall of the cold water pipe 2. As the debris removal plate 32 moves, the scraping edges 33 remove impurities adhering to the outer wall of the cold water pipe 2.

[0030] The two symmetrically distributed arc-shaped scraping edges 33 increase the contact area with the outer wall of the cold water pipe 2, achieving the dual effects of shoveling and scraping. The method of shoveling first and then scraping can effectively remove scraped impurities from the surface of the cold water pipe 2. Especially for impurities with strong viscosity, the arc-shaped scraping edge 33 that matches the outer periphery of the cold water pipe 2 can more easily scrape off the impurities, and then push them away from the outer surface of the cold water pipe 2 with the help of the impurity removal plate 32. At the same time, the arc-shaped design of the scraping edge 33 makes it fit more closely with the outer wall of the cold water pipe 2, avoiding local scraping leakage, ensuring the cleanliness of the outer wall of the cold water pipe 2, and maintaining the stability of heat exchange. The hinged structure gives the scraping edge 33 a certain degree of rotational freedom, which can adapt to slight deformations or unevenness of the outer wall of the cold water pipe 2, avoiding damage to the cold water pipe 2 caused by rigid contact, and extending the service life of the cold water pipe 2. The combination of the scraping edge 33 and the impurity removal plate 32 enhances the scraping ability of the impurity removal unit 3, further reduces the obstruction of the impurity layer to heat exchange, and cooperates with the countercurrent heat exchange structure of the cold water pipe 2 to improve the waste heat recovery efficiency, which helps to reduce overall energy consumption and meet the needs of reducing costs and increasing efficiency.

[0031] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, the transmission unit 4 includes a rotating frame 41 and a sliding pressure block 42. The rotating frame 41 is rotatably mounted on the impurity removal base frame 31. The impurity removal plate 32 is slidably mounted on the rotating frame 41 along the radial direction of the cold water pipe 2. The impurity removal plate 32 has a pressed inclined surface 321. The sliding pressure block 42 is slidably mounted on the rotating frame 41 and has a pressing inclined surface 421.

[0032] As the sliding pressure block 42 slides along the rotating frame 41 and approaches the dust removal plate 32, the extruding inclined surface 421 presses against the pressed inclined surface 321. Due to the action of the inclined surface, the dust removal plate 32 slides radially along the cold water pipe 2, approaching the outer wall of the cold water pipe 2. When the sliding pressure block 42 slides in the opposite direction, away from the dust removal plate 32, the dust removal plate 32 is moved away from the outer wall of the cold water pipe 2 by other forces.

[0033] The coordinated design of the rotating frame 41 and the sliding pressure block 42 converts the linear motion of the sliding pressure block 42 into radial sliding of the dust removal plate 32, thereby achieving precise control of the distance between the dust removal plate 32 and the outer wall of the cold water pipe 2. This structural design enables the dust removal plate 32 to adjust the contact force with the outer wall of the cold water pipe 2 according to actual needs, ensuring the effective removal of impurities while avoiding damage to the cold water pipe 2 due to excessive pressure. By controlling the sliding stroke of the sliding pressure block 42, the working position of the dust removal plate 32 can be flexibly adjusted to adapt to cold water pipes 2 of different diameters, thereby improving the versatility of the device. The rotation setting of the rotating frame 41 enables the dust removal plate 32 to maintain stable radial sliding during the rotation process. Combined with the structure of the dust removal unit 3, it further optimizes the dust removal process and improves the working efficiency and stability of the waste heat recovery device.

[0034] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, the transmission unit 4 includes an offset turntable 43 and a top pressure block 44. The offset turntable 43 is rotatably arranged on the impurity removal base frame 31 and is coaxial with the rotating frame 41. The top pressure block 44 is arranged on one side of the offset turntable 43 close to the rotating frame 41.

[0035] As the offset disc 43 rotates, the pressing block 44 rotates synchronously with it. The pressing block 44 is configured to press against the sliding pressing block 42 during rotation, causing it to slide along the rotating frame 41 and approach the debris removal plate 32. The pressing slope 421 of the sliding pressing block 42 presses against the pressed slope 321 of the debris removal plate 32, causing the debris removal plate 32 to slide radially along the cold water pipe 2 and approach the outer wall of the cold water pipe 2.

[0036] The coordinated design of the offset turntable 43 and the top pressure block 44 converts the rotational motion of the offset turntable 43 into the linear motion of the sliding pressure block 42, thereby driving the impurity removal plate 32 close to the outer wall of the cold water pipe 2, thereby achieving the contact pressure adjustment between the impurity removal plate 32 and the outer wall of the cold water pipe 2. This structural design enables the impurity removal plate 32 to adjust the contact force with the outer wall of the cold water pipe 2 according to actual needs, ensuring the effective removal of impurities while avoiding damage to the cold water pipe 2 due to excessive pressure. Through the rotation control of the offset turntable 43, the impurity removal plate 32 can be periodically moved close to and away from the outer wall of the cold water pipe 2 to adapt to different degrees of impurity adhesion, thereby improving the adaptability and flexibility of the impurity removal unit 3. The synergistic effect of the offset turntable 43 and the top pressure block 44 makes the impurity removal action more precise and controllable. Combined with the structure of the transmission unit 4, it further optimizes the impurity removal process and improves the working efficiency and stability of the waste heat recovery device.

[0037] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, transmission gear 1 45 and transmission gear 2 46 of transmission unit 4 are coaxially mounted on impurity removal base 31, sharing the same rotation axis and capable of synchronous rotation. A toothed belt 1 47 is provided on the outer circumference of the offset turntable 43, meshingly connected to transmission gear 1 45; a toothed belt 2 48 is provided on the outer circumference of the rotating frame 41, meshingly connected to transmission gear 2 46. Transmission gear 1 45 and transmission gear 2 46 rotate using the power provided by a servo motor in the prior art, which can output a bidirectional rotational driving force. Driven by transmission gear 1 45 and transmission gear 2 46, the offset turntable 43 and rotating frame 41 have different rotational angular velocities, resulting in relative offset rotation of the offset turntable 43 and rotating frame 41.

[0038] The coaxial rotation design of transmission gear 1 45 and transmission gear 2 46 ensures that the rotation of the offset turntable 43 and the rotating frame 41 has a fixed transmission ratio, realizes the precise linkage of the two movements, avoids mechanical interference caused by the asynchronous rotation of each, and improves the working stability of the transmission unit 4. The meshing transmission mode of the toothed belt and the gear has high transmission efficiency and precise transmission ratio, can effectively transmit power, and reduce energy loss during the movement. This transmission structure converts a single driving force into the coordinated movement of the offset turntable 43 and the rotating frame 41 through the cooperation of the gear and the toothed belt, simplifies the structure of the drive system, and reduces the complexity and failure rate of the equipment. At the same time, the reversibility of the meshing transmission allows the movement state of the offset turntable 43 and the rotating frame 41 to be precisely controlled by the gear speed, which is convenient for adjusting the impurity removal rhythm according to the impurity adhesion situation, further optimizing the impurity removal effect, ensuring the heat exchange efficiency of the cold water pipe 2, and thus improving the comprehensive energy utilization ability of the device. At the same time, the relative rotation between the offset turntable 43 and the rotating frame 41 causes the top pressure block 44 to move closer to and press the sliding pressure block 42 when the offset turntable 43 rotates synchronously, and then separates, making it easier to adjust the pressure between the top pressure block 44 and the sliding pressure block 42.

[0039] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, the blade unit 5 includes a blade slide 51 and two connecting rods 52. The blade slide 51 is slidably mounted on the dust removal plate 32 and can slide along the length of the dust removal plate 32. One end of the two connecting rods 52 is coaxially hinged to the blade slide 51, and the other end is hinged to the two scraping edges 33 in a one-to-one correspondence.

[0040] When the bladed slider 51 slides, it drives the two connecting rods 52 to move. If the bladed slider 51 slides toward the cold water pipe 2, the two connecting rods 52 move toward the center, causing the two scraping edges 33 to close inward around their hinge points with the debris removal plate 32. If the bladed slider 51 slides away from the cold water pipe 2, the two connecting rods 52 push apart to the sides, causing the two scraping edges 33 to open outward around their hinge points with the debris removal plate 32.

[0041] The setting of the sharpening unit 5 enables the two shovel blades 33 to adjust their opening angles according to actual needs to adapt to impurity layers of different thicknesses and hardnesses. When the impurity layer is thicker or harder, the two shovel blades 33 can be opened outward at a larger angle by controlling the sliding of the sharpening slider 51, thereby enhancing the ability to remove impurities. By adjusting the opening angle of the shovel blades 33, the shovel blades 33 can be prevented from causing excessive scratching on the outer wall of the cold water pipe 2, thereby protecting the surface integrity of the cold water pipe 2 and extending its service life. The synergistic effect of the sharpening slider 51 and the connecting rod 52 enables the angle adjustment action of the shovel blade 33 to cooperate with the sliding and rotating action of the impurity removal plate 32, further optimizing the impurity removal process and improving the impurity removal efficiency and effect. The combination of the sharpening unit 5 and the shovel blade 33 structure enables the impurity removal unit 3 to more effectively remove impurities on the outer wall of the cold water pipe 2, ensuring the continuous and stable operation of the waste heat recovery device.

[0042] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, in the blade unit 5, a roller 53 is rotatably mounted on the end of the blade slide 51 away from the connecting rod 52. A lifting block 54 is mounted on the sliding pressure block 42 and has a lifting slope 541. A return spring 55 acts on the blade slide 51 at one end and on the dust removal plate 32 at the other end. Return spring 55 is a conventional spring.

[0043] When the sliding pressure block 42 slides under the action of the pushing block 44, the lifting block 54 slides synchronously, and the lifting slope 541 presses against the roller 53. The roller 53 reduces the friction force on the lifting slope 541, driving the bladed slider 51 to slide away from the cold water pipe 2, causing the two connecting rods 52 to push apart to the sides, and the two shovel blades 33 to open outward. At the same time, the hinge axes of the two connecting rods 52 move closer to the hinge axes of the two shovel blades 33, so that the shovel blades 33 better fit the outer wall of the cold water pipe 2. When the sliding pressure block 42 slides in the opposite direction, the lifting block 54 disengages from the roller 53, and the reset elastic member 55 provides a force to push the bladed slider 51 closer to the cold water pipe 2. The bladed slider 51 slides in the direction closer to the cold water pipe 2, and the two connecting rods 52 converge toward the center. The two shovel blades 33 close inward, and at the same time, wrap the hinge axes of the two connecting rods 52.

[0044] The coordinated design of the lifting block 54 and the roller 53 converts the linear motion of the sliding pressure block 42 into the sliding of the blade slide 51, realizing the automatic adjustment of the opening angle of the shovel blade 33. This structural design allows the opening and closing of the shovel blade 33 to be synchronized with the movement of the impurity removal plate 32 approaching and moving away from the outer wall of the cold water pipe 2, thereby improving the working efficiency of the impurity removal unit 3. The setting of the reset elastic member 55 ensures that the blade slide 51 can automatically reset after the lifting block 54 is separated from the roller 53, so that the shovel blade 33 can be closed in time. Through the coordinated action of the lifting block 54, the roller 53 and the reset elastic member 55, the blade unit 5 can automatically adjust the opening angle of the shovel blade 33 according to the distance between the impurity removal plate 32 and the outer wall of the cold water pipe 2, thereby enhancing the adaptability and reliability of the impurity removal unit 3 and further optimizing the performance of the waste heat recovery device.

[0045] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, the unlocking unit 6 includes an unlocking block 61, an unlocking rocker 62, and a torsional elastic member 64. The unlocking block 61 is located on the end of the sliding pressure block 42 away from the dust removal plate 32 and has a curved sliding surface 611 on the side near the sliding pressure block 42. The unlocking rocker 62 has one end hinged to the offset rotary disk 43 and an unlocking rod 63 at the other end. The torsional elastic member 64 acts on the unlocking rocker 62 at one end and on the offset rotary disk 43 at the other end. The torsional elastic member 64 is a conventional torsion spring.

[0046] When the offset disc 43 rotates, it drives the unlocking lever 62 to rotate synchronously. During this rotation, the unlocking lever 63 presses against the outer end surface of the unlocking block 61, causing the unlocking lever 62 to swing about its hinge point and drive the torsional elastic member 64 to accumulate elastic force. When the offset disc 43 is in operation, its rotation direction is defined as the forward direction. During the forward operation of the offset disc 43, the unlocking lever 63 and the outer end surface of the unlocking block 61 periodically come into contact with each other. When the operation is completed, under the power output of the servo motor, the offset turntable 43 rotates in the opposite direction, the torsional elastic member 64 releases the accumulated elastic force, and the unlocking rocker arm 62 returns to its natural state. At this time, driven by the offset turntable 43, the unlocking rod 63 gradually approaches and presses against the arc-shaped sliding surface 611 of the unlocking block 61, causing the unlocking rocker arm 62 to swing in the opposite direction around its hinge point. After the unlocking rocker arm 62 swings in the opposite direction for a certain angle, it contacts the limit column on the offset turntable 43, and the unlocking rocker arm 62 stops swinging; as the offset turntable 43 continues to rotate, the unlocking rod 63 squeezes the arc-shaped sliding surface 611 and drives the sliding pressure block 42 away from the debris removal plate 32.

[0047] The setting of the unlocking unit 6 enables the sliding pressure block 42 to quickly move away from the dust removal plate 32 when needed, thereby separating the dust removal plate 32 from the outer wall of the cold water pipe 2, and facilitating the maintenance and inspection of the equipment. The design of the arc-shaped sliding surface 611 enables the unlocking rod 63 to smoothly transition during the pressing process, reducing wear and noise, and improving the service life and operational stability of the equipment. The function of the torsional elastic member 64 ensures that the unlocking rocker 62 can automatically reset after the unlocking action is completed, preparing for the next unlocking operation, and ensuring the continuity and reliability of the unlocking unit 6. The synergistic effect of the unlocking unit 6 and the transmission unit 4 enables the working state of the dust removal plate 32 to be flexibly adjusted according to actual needs, further optimizing the operating performance of the waste heat recovery device, and improving the ease of use and maintenance efficiency of the equipment.

[0048] In some examples, the structure of the waste heat recovery device for preparing zinc oxide from zinc-containing ash is optimized, for example Figures 1 to 5 As shown, the debris removal base 31 has an open rope retaining slot 311. The drive unit 7 includes a drive rope 71 and two rope limiting blocks 72. The maximum cross-section of the rope limiting blocks 72 is larger than the rope retaining slot 311. The drive rope 71 is detachably retained in the rope retaining slot 311. The two rope limiting blocks 72 are both mounted on the drive rope 71, one on each side of the rope retaining slot 311.

[0049] When the impurity removal base 31 needs to be driven to slide along the axis of the cold water pipe 2, an external driving device such as a winch or motor is used to force the driving rope 71 to move, and the impurity removal base 31 is driven to slide synchronously through the limiting rope block 72. Since the rope retaining groove 311 is open, the driving rope 71 can be easily removed and installed, facilitating maintenance and replacement of the equipment.

[0050] The open rope slot 311 design makes the installation and disassembly of the drive rope 71 more convenient and can be completed without complicated operations, thereby improving the maintenance efficiency of the equipment. The setting of the limiting rope block 72 ensures the effective connection between the drive rope 71 and the impurity removal base 31, so that the drive rope 71 can reliably transmit power, drive the impurity removal base 31 to slide, and ensure the normal operation of the impurity removal unit 3. The drive unit 7 has a simple structure and low cost, and can achieve smooth sliding of the impurity removal base 31, reducing the vibration and noise of the equipment and improving the operating stability of the equipment. This detachable drive structure allows the impurity removal unit 3 to be flexibly replaced or adjusted as needed, enhancing the adaptability and flexibility of the waste heat recovery device and further optimizing the performance of the equipment.

[0051] like Figures 1 to 5 As shown, it shows a production process for preparing zinc oxide from zinc-containing ash in one embodiment of the present invention, which specifically includes the following steps: Ash loading: transport zinc-containing ash to the treatment system.

[0052] Rotary kiln high temperature diversion: The ash is treated at high temperature in the rotary kiln to form gaseous and solid materials.

[0053] Heat exchange and cooling: Gaseous material enters the heat exchange chamber 1 of the waste heat recovery unit via induced draft, where it undergoes countercurrent heat exchange with the cold water in the cold water pipe 2. The gaseous material cools down to form solid dust, while the cold water absorbs the waste heat. During this process, the impurity removal unit 3 removes impurities from the outer wall of the cold water pipe 2 through the sliding of the impurity removal base 31 and the rotation of the impurity removal plate 32, ensuring heat exchange efficiency.

[0054] Solid dust pickling and separation: Solid dust is pickled to obtain a variety of metal elements, which are then separated one by one.

[0055] Preparation of zinc carbonate: Sulfuric acid and sodium carbonate are gradually added to the separated zinc powder to finally obtain zinc carbonate.

[0056] High temperature calcination: Zinc carbonate is decomposed by high temperature calcination to obtain zinc oxide product.

[0057] Solid material processing: When the gaseous material is cooled by induced draft, the solid material is cooled simultaneously, and iron powder and slag tailings are obtained through magnetic separation. The iron powder is recycled and the slag tailings are used to make ceramsite.

[0058] The application of the waste heat recovery device realizes the efficient recovery of waste heat of gaseous materials, reduces energy consumption, and improves the comprehensive utilization rate of energy. The continuous cleaning of the outer wall of the cold water pipe 2 by the impurity removal unit 3 avoids the decrease in heat exchange efficiency caused by the thickening of the impurity layer, and ensures the stability and continuity of the production process. The synergistic effect of the high-temperature diversion of the rotary kiln and the waste heat recovery enables the entire process to effectively utilize the energy in the process while treating zinc-containing ash, thereby reducing production costs. The orderly implementation of the acid washing separation of solid dust and the zinc carbonate preparation steps ensures the purity and quality of the zinc oxide product. The magnetic separation of solid materials realizes the comprehensive utilization of resources and reduces waste emissions. The simultaneous implementation of steps S3 and S7 in the entire process optimizes the production process, shortens the production cycle, improves production efficiency, and fully achieves the goal of reducing costs and increasing efficiency.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A waste heat recovery device for preparing zinc oxide from zinc-containing ash, characterized in that: include: A heat exchange chamber (1) for circulating hot air; A plurality of cold water pipes (2) are arranged in the heat exchange chamber (1), and the cold water pipes (2) are arranged parallel to each other. The extension direction of the cold water pipes (2) is parallel to the flow direction of the hot air, and the flow direction of the cold water in the cold water pipes (2) is opposite to the flow direction of the hot air. The impurity removal unit (3) is arranged on the outer wall of the cold water pipe (2), and the impurity removal unit (3) comprises: A de-cluttering base frame (31), wherein the cold water pipe (2) is slidably arranged on the outer wall of the cold water pipe (2); The impurity removal plate (32) is rotatably mounted on the impurity removal base frame (31) and is used to remove impurities attached to the outer wall of the cold water pipe (2).

2. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 1, characterized in that: The impurity removal unit (3) further comprises: Two scraping edges (33) are coaxially hinged to one end of the impurity removal plate (32) close to the cold water pipe (2), and the two scraping edges (33) are symmetrically distributed on both sides of the impurity removal plate (32), and the scraping edges (33) are arc-shaped.

3. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 2, characterized in that: It also includes a transmission unit (4), which includes: A rotating frame (41) is rotatably mounted on the impurity removal base frame (31); the impurity removal plate (32) is slidably mounted on the rotating frame (41) along the radial direction of the cold water pipe (2); and the impurity removal plate (32) has a pressed inclined surface (321); A sliding pressing block (42) is slidably disposed on the rotating frame (41) and has an extrusion inclined surface (421). The sliding pressing block (42) is configured such that after sliding, the extrusion inclined surface (421) presses against the pressed inclined surface (321) to move the impurity removal plate (32) close to the outer wall of the cold water pipe (2).

4. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 3, characterized in that: The transmission unit (4) further includes: a staggered turntable (43) rotatably disposed on the impurity removal base frame (31) and coaxial with the rotating frame (41); A pressing block (44) is provided on a side of the offset turntable (43) close to the rotating frame (41), and the pressing block (44) is configured to press the sliding pressing block (42) under the rotation of the offset turntable (43) so that the sliding pressing block (42) is close to the impurity removal plate (32).

5. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 4, characterized in that: The transmission unit (4) further comprises: Coaxially rotating a transmission gear 1 (45) and a transmission gear 2 (46) provided on the impurity removal base frame (31); Toothed belt 1 (47), provided on the outer periphery of the offset turntable (43) and meshingly connected with the transmission gear 1 (45); Toothed belt 2 (48) is provided on the outer periphery of the rotating frame (41) and is meshedly connected with the transmission gear 2 (46).

6. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 4, characterized in that: It also includes a cutting unit (5), which includes: A sharpened sliding member (51) is slidably disposed on the impurity removal plate (32); Two connecting rods (52) are coaxially hinged to the blade slide (51), and the other ends of the two connecting rods (52) away from the coaxial hinge are hinged to the two shovel blades (33) in a one-to-one correspondence; The edged slide (51) is configured to slide closer to or farther away from the cold water pipe (2), and at the same time, the edged slide (51) drives the two connecting rods (52) to move the two connecting rods (52) toward the middle or push the two shovel blades (33) toward both sides.

7. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 6, characterized in that: A roller (53) is rotatably provided at one end of the blade-cutting slide (51) away from the connecting rod (52), and the blade-cutting unit (5) further comprises: A lifting block (54) is provided on the sliding pressure block (42) and has a lifting inclined surface (541). The lifting block (54) is configured to slide synchronously with the sliding of the sliding pressure block (42), so that the lifting inclined surface (541) presses against the roller (53) and drives the edged sliding member (51) to slide in a direction away from the cold water pipe (2); A reset elastic member (55) has one end acting on the edged sliding member (51) and the other end acting on the impurity removal plate (32), and the reset elastic member (55) is used to provide a force that causes the edged sliding member (51) to approach the cold water pipe (2).

8. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 7, characterized in that: It also includes an unlocking unit (6), which includes: An unlocking block (61) is provided on the sliding pressing block (42) at an end away from the impurity removal plate (32), and a side of the unlocking block (61) close to the sliding pressing block (42) has an arc-shaped sliding surface (611); An unlocking rocker (62), one end of which is hinged to the offset turntable (43) and the other end of which has an unlocking lever (63); a torsional elastic member (64), one end of which acts on the unlocking rocker (62) and the other end of which acts on the offset rotary disk (43); The unlocking rocker (62) is configured to be driven by the rotation of the offset rotary disc (43) so that the unlocking rod (63) is pressed against the arc-shaped sliding surface (611) and drives the sliding pressing block (42) away from the debris removal plate (32).

9. The waste heat recovery device for preparing zinc oxide from zinc-containing ash according to claim 1, characterized in that: The impurity removal base frame (31) has an open rope clamping slot (311). The waste heat recovery device for preparing zinc oxide from zinc-containing ash further comprises a driving unit (7). The driving unit (7) comprises: A driving rope (71) is detachably mounted in the rope slot (311); There are two limiting rope blocks (72) and both are arranged on the driving rope (71). The two limiting rope blocks (72) are respectively located on both sides of the rope clamping groove (311).

10. A production process for preparing zinc oxide from zinc-containing ash, which is carried out using the waste heat recovery device for preparing zinc oxide from zinc-containing ash according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: ash loading; Step S2: The rotary kiln is used for high-temperature diversion to form gaseous and solid materials; Step S3: The gaseous material is driven by induced draft and enters the heat exchange chamber (1) for heat exchange and cooling treatment to obtain solid dust; Step S4: pickling the solid dust to obtain a variety of metal elements, and separating them one by one; Step S5: gradually heating sulfuric acid and sodium carbonate in the separated zinc powder to finally obtain zinc carbonate; Step S6: calcining zinc carbonate at high temperature to obtain zinc oxide; Step S7: The solid material is cooled and magnetically separated to obtain iron powder and slag tailings. The iron powder is recovered and the slag tailings are used to make ceramsite for other uses. Wherein, the step S3 and the step S7 are performed simultaneously.

Images