Zinc-containing soot recovery device

Abstract

The utility model discloses a zinc-containing soot recovery device which comprises a low-temperature drying section, a high-temperature volatilization section, a cross-flow cooling end and an air cooling section which are sequentially arranged in the material conveying direction, and the low-temperature drying section is used for heating materials below a first set temperature so as to remove moisture in the materials. The high-temperature volatilization section is used for heating the material to a temperature higher than a second set temperature and preserving heat for a preset time to remove volatile components in the material, the cross-flow cooling section is used for introducing a protective atmosphere to cool the material to a set temperature interval, and the air cooling section is used for introducing cooling air to cool the material to a third set temperature; the recovery device further comprises a first temperature control assembly, a second temperature control assembly, a ventilation assembly and a flue gas treatment assembly. Compared with the prior art, material bursting and pulverization are prevented by effectively controlling the material heating rate and avoiding material oxidation, volatile components are treated in time, follow-up treatment is facilitated, the recycling efficiency is high, and pollution to the environment is reduced to the maximum extent.

Description

Technical Field

[0001] This utility model relates to the field of metal recycling equipment technology, and in particular, to a zinc-containing flue ash recycling device. Background Technology

[0002] During blast furnace production, a large amount of blast furnace ash is typically generated. Since blast furnace ash contains recyclable zinc, how to effectively utilize this zinc-containing ash to recover valuable elements has been a long-standing challenge for production enterprises. One technology involves mixing the zinc-containing ash with coke powder and then feeding it into a rotary kiln for high-temperature fumigation to obtain zinc oxide powder, thus effectively recovering and utilizing the zinc in the zinc-containing ash.

[0003] For example, Chinese utility model patent CN216115320U discloses a solid waste recycling system for extracting zinc oxide from zinc-containing waste ash. The system includes a volatile rotary kiln, a feeding system for feeding material into the rotary kiln, and a gas-solid separation system for separating finished zinc oxide from the rotary kiln flue gas. The gas-solid separation system includes a high-temperature dust collector and an air cooler disposed between the high-temperature dust collector and the volatile rotary kiln. The air cooler has two or more dust outlets, at least one of which, near the air cooler's inlet, is connected to a raw material silo for feeding material into the feeding system. The high-temperature dust collector's dust outlet and at least one air cooler's dust outlet, away from the air cooler's inlet, are connected to the finished product silo. Compared to existing technologies, using zinc-containing waste ash as raw material has advantages such as low raw material cost and wide availability. The use of this raw material represents a secondary utilization of solid waste, reducing solid waste pollution to a certain extent.

[0004] For example, Chinese utility model patent CN217210280U discloses a rotary kiln for producing zinc oxide using zinc-containing flue dust. The kiln includes a bottom plate and a rotary kiln body. Bearing seats are fixedly connected to both ends of the top outer wall of the bottom plate, and bearings are installed on the inner walls of the bearing seats. A drive motor is located in the middle of the top outer wall of the bottom plate, and the output end of the drive motor is fixedly connected to a rotating gear via a rotating shaft. Collars are fitted onto both ends of the outer wall of the rotary kiln body, and these collars are rotatably connected to bearings on the inner walls of the bearing seats. A driven gear is fitted onto the outer wall of the rotary kiln body, meshing with the top outer wall of the rotating gear. A front sealing plate and a rear sealing plate are fixedly connected to the outer walls on both sides of the rotary kiln body, respectively. Multiple linearly arranged fixing plates are fixedly connected to the inner wall of the rotary kiln body, and a fixing groove is formed on one side of the outer wall of each fixing plate. In this utility model, the waste residue is centrally processed through the provided door and return spring, which is very convenient.

[0005] However, during the recycling process, the char pellets prepared by mixing zinc-containing flue ash and carbon source cannot be processed in time after generating volatile organic compounds during low-temperature drying and high-temperature reduction. At the same time, the char pellets are prone to cracking and pulverization, which makes subsequent processing difficult, resulting in low recycling efficiency and easy environmental pollution. Utility Model Content

[0006] This invention provides a zinc-containing flue ash recovery device to solve the technical problems of existing recovery devices, such as the failure to promptly treat the volatile organic compounds generated during the recovery process, the easy cracking and pulverization of char pellets, low recovery efficiency, high energy consumption, and easy environmental pollution.

[0007] According to one aspect of this utility model, a zinc-containing flue gas recovery device is provided, comprising a low-temperature drying section, a high-temperature volatilization section, a cross-flow cooling section, and an air cooling section arranged sequentially along the material conveying direction. The low-temperature drying section is used to heat the material below a first set temperature to remove moisture from the material. The high-temperature volatilization section is used to heat the material to a temperature above a second set temperature and hold it at that temperature for a preset time to remove volatiles from the material. The cross-flow cooling section is used to introduce a protective atmosphere to cool the material to a set temperature range. The air cooling section is used to introduce cooling air to cool the material to a third set temperature. It also includes a first temperature control component installed in the low-temperature drying section to control the heating rate of the material by controlling the temperature rise curve in the low-temperature drying section; a second temperature control component installed in the high-temperature volatilization section to control the temperature rise curve and the holding temperature in the high-temperature volatilization section to control the heating rate of the material; a ventilation component connected to the high-temperature volatilization section and the through-flow cooling section to introduce a protective atmosphere into the high-temperature volatilization section and the through-flow cooling section respectively; and a flue gas treatment component connected to the low-temperature drying section and the high-temperature volatilization section to extract water vapor and volatiles, and discharge the volatiles to the outside after treatment.

[0008] As a further improvement to the above technical solution:

[0009] Furthermore, the low-temperature drying section includes a material conveying layer 1 for conveying materials, an air distribution chamber located below the material conveying layer 1 for adjusting the ratio of cold air and hot air, an air supply component for heating and conveying hot air that is connected to the air distribution chamber and the low-temperature drying section respectively, and an air collection hood 1 located above the material conveying layer 1 and connected to the flue gas treatment component. Multiple air distribution chambers are arranged sequentially along the material conveying direction.

[0010] Furthermore, the first temperature control component includes a temperature sensor 1 installed in the air distribution chamber for monitoring the air temperature, and a controller 1 connected to the temperature sensor 1 and the air distribution chamber respectively for controlling the ratio of cold air and hot air in the air distribution chamber according to the air temperature monitored by the temperature sensor 1. The temperature sensor 1 and the air distribution chamber are installed in a one-to-one correspondence.

[0011] Furthermore, the high-temperature volatilization section includes multiple high-temperature zones arranged sequentially along the material conveying direction, a ventilation hood 1 located below the high-temperature zones and connected to the ventilation components for introducing a protective atmosphere, and a gas collection hood 2 located above the high-temperature zones and connected to the flue gas treatment components. The first few high-temperature zones are used to heat the material, and the latter few high-temperature zones are used to keep the material warm. Heaters are arranged in each of the high-temperature zones.

[0012] Furthermore, the second temperature control component includes a temperature sensor 2 installed in the high-temperature zone for monitoring the temperature of the high-temperature zone, and a controller 2 connected to the temperature sensor 2 and the heater respectively for controlling the heating temperature of the heater in the corresponding high-temperature zone according to the temperature of the high-temperature zone monitored by the temperature sensor 2. The temperature sensor 2 and the high-temperature zone are installed in a one-to-one correspondence.

[0013] Furthermore, the through-flow cooling section includes multiple cooling temperature zones arranged sequentially along the material conveying direction, a cooling air chamber arranged below the cooling temperature zones and connected to the ventilation component for conveying and regulating the flow rate of the protective atmosphere, a gas collecting hood three arranged above the cooling temperature zones and connected to the ventilation component, and a heat exchanger arranged on the gas collecting hood three for cooling the protective atmosphere. The cooling air chamber and the cooling temperature zones are arranged in a one-to-one correspondence.

[0014] Furthermore, the ventilation assembly includes a gas storage tank for storing a protective atmosphere, a ventilation pipe I connected to the gas storage tank and the high-temperature volatilization section respectively, a ventilation pipe II connected to the gas storage tank and the cooling gas chamber respectively, a cyclone dust collector connected to the gas collection hood II, and a return fan connected to the cyclone dust collector and the gas storage tank respectively for recovering the protective atmosphere.

[0015] Furthermore, the recovery device also includes a third temperature control component, which includes a temperature sensor three disposed in the cooling zone for monitoring the temperature of the cooling zone, and a controller three connected to the temperature sensor three and the cooling chamber respectively for controlling the flow rate of the protective atmosphere in the cooling chamber according to the temperature of the cooling zone monitored by the temperature sensor three.

[0016] Furthermore, the air cooling section includes a material conveying layer two for material conveying, a ventilation hood two arranged above the material conveying layer two, a cooling fan for conveying cooling gas connected to the ventilation hood two, and a gas collecting hood four arranged below the material conveying layer and connected to the low-temperature drying section.

[0017] Furthermore, the flue gas treatment assembly includes a negative pressure channel connected to the high-temperature volatilization section and the low-temperature drying section respectively, a flue gas dust collector connected to the negative pressure channel, and a flue gas induced draft fan connected to the flue gas dust collector.

[0018] This utility model has the following beneficial effects:

[0019] The zinc-containing flue ash recovery device of this utility model involves the material sequentially passing through a low-temperature drying section, a high-temperature volatilization section, a cross-flow cooling end, and an air cooling section. In the low-temperature drying section, the material is heated below the first set temperature to remove moisture. The evaporation section heats the material to the first temperature. The material is kept at a set temperature above the set temperature for a preset time to remove volatiles. A protective atmosphere is introduced into the through-flow cooling section to cool the material to a set temperature range. Cooling air is introduced into the air cooling section to cool the material to a third set temperature. This process is continuous and automatic, enabling effective recovery of zinc from the material. During recovery, the first temperature control component controls the heating rate of the material in the low-temperature drying section, preventing it from overheating and pulverizing. The second temperature control component controls the heating rate of the material in the high-temperature volatilization section, ensuring effective volatilization of organic matter while preventing pulverization. Ventilation components supply air to the high-temperature volatilization section and the… A protective atmosphere is introduced into the cross-flow cooling section to prevent the materials in the high-temperature volatile section and the cross-flow cooling end from exploding and pulverizing due to oxidation. Moisture in the low-temperature drying section and volatiles in the high-temperature volatile section are extracted by the flue gas treatment component and discharged to the outside after treatment. This achieves timely treatment of volatiles while retaining the volatilized zinc element and avoiding environmental pollution from generated gases during operation. Compared with existing technologies, this solution effectively controls the heating rate of materials and prevents material oxidation to avoid exploding and pulverizing. It also promptly treats volatiles, facilitating subsequent processing and achieving continuous automated material recovery with high efficiency. It minimizes environmental pollution, is highly practical, and suitable for widespread promotion and application.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 This is a first-view structural schematic diagram of a zinc-containing flue ash recycling device according to a preferred embodiment of the present invention;

[0023] Figure 2 This is a second-view structural schematic diagram of the zinc-containing flue ash recovery device according to a preferred embodiment of the present invention;

[0024] Figure 3 This is a simplified structural layout diagram of a zinc-containing flue ash recycling device according to a preferred embodiment of the present invention.

[0025] Legend:

[0026] 100. Low-temperature drying section; 110. Air distribution chamber; 121. Air supply duct; 122. Air heater; 123. Circulating fan; 130. Gas collection hood one; 200. High-temperature evaporation section; 210. Ventilation hood one; 220. Gas collection hood two; 230. Heater; 300. Through-flow cooling section; 310. Cooling chamber; 320. Gas collection hood three; 330. Heat exchanger; 400. Air cooling section; 410. Ventilation hood two; 420. Cooling fan; 430. Gas collection hood four; 510. Air storage tank; 520. Ventilation pipe one; 530. Ventilation pipe two; 540. Cyclone dust collector; 550. Return fan; 560. Air supply component; 610. Negative pressure channel; 620. Flue gas dust collector; 630. Flue gas induced draft fan; 640. Exhaust pipe. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] like Figures 1-3 As shown, the zinc-containing ash recovery device of this embodiment includes a low-temperature drying section 100, a high-temperature volatilization section 200, a cross-flow cooling section 300, and an air cooling section 400 arranged sequentially along the material conveying direction. The low-temperature drying section 100 is used to heat the material below a first set temperature to remove moisture from the material. The high-temperature volatilization section 200 is used to heat the material to a second set temperature and hold it at that temperature for a preset time to remove volatiles from the material. The cross-flow cooling section 300 is used to introduce a protective atmosphere to cool the material to a set temperature range. The air cooling section 400 is used to introduce cooling air to cool the material to a third set temperature. The recovery device also includes sections arranged in a low-temperature drying section 100, a high-temperature volatilization section 200, a cross-flow cooling section 300, and an air cooling section 400. The system includes a first temperature control component in the low-temperature drying section 100 for controlling the heating rate of the material by controlling the temperature rise curve in the low-temperature drying section 100; a second temperature control component in the high-temperature volatile section 200 for controlling the temperature rise curve and the holding temperature in the high-temperature volatile section 200 to control the heating rate of the material; a ventilation component connected to the high-temperature volatile section 200 and the through-flow cooling section 300 for introducing protective atmospheres into the high-temperature volatile section 200 and the through-flow cooling section 300 respectively; and a flue gas treatment component connected to the low-temperature drying section 100 and the high-temperature volatile section 200 for extracting water vapor and volatiles, and discharging the volatiles to the outside after treatment.

[0029] like Figures 1-3As shown, specifically, in this invention's zinc-containing ash recovery device, the material sequentially passes through a low-temperature drying section 100, a high-temperature volatilization section 200, a cross-flow cooling end, and an air cooling section 400. In the low-temperature drying section 100, the material is heated below a first set temperature to remove moisture. In the high-temperature volatilization section 200, the material is heated to above a second set temperature and held at that temperature for a preset time to remove volatiles. In the cross-flow cooling section 300, a protective atmosphere is introduced to cool the material to a set temperature range. In the air cooling section 400, cooling air is introduced to cool the material to a third set temperature. The above process is continuously and automatically performed, enabling effective recovery of zinc from the material. Furthermore, during the recovery process, the heating curve in the low-temperature drying section 100 is controlled by a first temperature control component to control the heating rate of the material, preventing the material from overheating and cracking / pulverizing. The heating curve and holding temperature in the high-temperature volatilization end are controlled by a second temperature control component to control the material's temperature rise. The heating rate ensures effective volatilization of organic matter in the material during heating while preventing material explosion and pulverization. Protective atmospheres are introduced into the high-temperature volatilization section 200 and the through-flow cooling section 300 via a ventilation assembly to prevent material explosion and pulverization due to oxidation in both sections. A flue gas treatment assembly extracts moisture from the low-temperature drying section 100 and volatiles from the high-temperature volatilization section 200, treating the volatiles before discharging them to the outside. This achieves timely treatment of volatiles while retaining volatilized zinc elements and avoiding environmental pollution from generated gases. Compared to existing technologies, this solution effectively controls the heating rate and prevents material oxidation to prevent explosion and pulverization, promptly treating volatiles for subsequent processing. It achieves continuous automated material recovery with high efficiency, minimizing environmental pollution. It is highly practical and suitable for widespread promotion and application.

[0030] It should be understood that the zinc-containing flue ash recycling device of this utility model can also be used for the pretreatment of new energy materials.

[0031] Optionally, the first set temperature is 300℃. Optionally, the second set temperature is 500℃. Optionally, the set temperature range is 100℃-200℃. Optionally, the third set temperature is 60℃. Optionally, the preset time is 20min-30min.

[0032] Optionally, the recycling device also includes a chain plate for material conveying and a motor for driving the chain plate to rotate to convey the material.

[0033] Optionally, the rotary device also includes a material chute disposed on the input end of the chain plate to feed the material evenly onto the chain plate.

[0034] Optionally, the fabric chute can be equipped with a roller screen or a roller feeder.

[0035] It should be understood that the material is obtained by granulation of zinc-containing materials, reducing agents and binders. It can be a carbon pellet formed by mixing zinc-containing flue ash, binders and carbon powder. The volatiles in the high-temperature volatilization section 200 are formed after the binder volatilizes when heated.

[0036] like Figure 3 As shown, in this embodiment, the low-temperature drying section 100 includes a material conveying layer 1 for conveying materials, an air distribution chamber 110 arranged below the material conveying layer 1 for adjusting the ratio of cold air and hot air, an air supply component for heating and conveying hot air that is connected to the air distribution chamber 110 and the low-temperature drying section 100 respectively, and a gas collection hood 130 arranged above the material conveying layer 1 and connected to the flue gas treatment component. Multiple air distribution chambers 110 are arranged sequentially along the material conveying direction. Specifically, the hot air after cooling the material in the air cooling section 400 is delivered to the air distribution chamber 110 through the air supply component to achieve heat recycling, reduce energy consumption, save energy, and ensure a clean and hygienic working environment. The air supply component can also heat the hot air to ensure that the hot air temperature meets the requirements. The air distribution chamber 110 is used to adjust the ratio of cold air and hot air to regulate the air temperature. Through the multiple air distribution chambers 110 arranged sequentially in the material conveying direction, the temperature rise curve of the low temperature drying section 100 can be effectively controlled to ensure that the moisture of the material in the material conveying layer 1 can be removed smoothly without bursting or pulverizing. The water vapor is collected by the gas collection hood 130 for the flue gas treatment component to draw it in.

[0037] Optionally, the air supply component includes an air supply duct 121 connected to the air distribution chamber 110, an air heater 122 installed on the air supply duct 121, and a circulating fan 123 connected to the air supply duct 121 and the air cooling section 400, respectively. The circulating fan 123 introduces the hot air after the material in the air cooling section is cooled into the air supply duct 121, and after being heated by the air heater 122, it is delivered to the air distribution chamber 110 through the air supply duct 121.

[0038] Optionally, the air heater 122 is an electric heater.

[0039] Optionally, five ventilation chambers (110) can be provided.

[0040] Optionally, the air distribution chamber 110 is provided with an air distribution pipe connected to the air supply duct 121 and an air distribution ball valve installed on the air distribution pipe for controlling the gas flow.

[0041] In this embodiment, the first temperature control component includes a temperature sensor 1 installed in the air distribution chamber 110 for monitoring the air temperature, and a controller 1 connected to both the temperature sensor 1 and the air distribution chamber 110 for controlling the ratio of cold and hot air in the corresponding air distribution chamber 110 based on the air temperature monitored by the temperature sensor 1. The temperature sensor 1 and the air distribution chamber 110 are arranged in a one-to-one correspondence. Specifically, the temperature sensor 1 monitors the air temperature in the air distribution chamber 110, and the controller 1 controls the ratio of cold and hot air in the corresponding air distribution chamber 110 based on the air temperature monitored by the temperature sensor 1. This allows multiple temperature sensors 1 and multiple air distribution chambers 110 to work together to precisely control the temperature rise curve of the material in the low-temperature drying section 100, thereby controlling the heating rate of the material in the low-temperature drying section 100 and preventing the material from exploding and pulverizing due to excessive heating in the low-temperature drying section 100.

[0042] Optionally, the temperature sensor is a thermocouple.

[0043] Optionally, controller one is a PLC controller.

[0044] like Figure 3 As shown, in this embodiment, the high-temperature volatilization section 200 includes multiple high-temperature zones arranged sequentially along the material conveying direction, a ventilation hood 210 arranged below the high-temperature zones and connected to the ventilation assembly for introducing a protective atmosphere, and a gas collection hood 220 arranged above the high-temperature zones and connected to the flue gas treatment assembly. The first few high-temperature zones are used to heat the material, and the latter few high-temperature zones are used to keep the material warm. Heaters 230 are arranged in each high-temperature zone. Specifically, after the material is dried and dehydrated in the low-temperature drying section 100, it is moved to the high-temperature volatile section 200 to be heated to above the second set temperature in the first few high-temperature zones, and then kept at the temperature for a preset time in the subsequent high-temperature zones to ensure that the volatile matter is removed to below 1%. During the heating and holding process, the ventilation component introduces a protective atmosphere into the high-temperature zone through the ventilation hood 210 to prevent the material from oxidizing at high temperature. The protective atmosphere is a slightly negative pressure atmosphere so that the volatile matter can be collected in the gas collection hood 220, and then the flue gas treatment component draws in the volatile matter under negative pressure to achieve the treatment of volatile matter.

[0045] Optionally, the high-temperature evaporation section 200 includes 5 high-temperature zones, the first 3 of which are used to heat the material, and the last 2 of which are used to keep the material warm.

[0046] Optionally, heater 230 employs infrared radiation heating.

[0047] In this embodiment, the second temperature control component includes a second temperature sensor deployed within the high-temperature zone for monitoring the temperature of the high-temperature zone, and a second controller connected to the second temperature sensor and the heater 230 respectively for controlling the heating temperature of the heater 230 within the corresponding high-temperature zone based on the high-temperature zone temperature monitored by the second temperature sensor. The second temperature sensor and the high-temperature zone are deployed in a one-to-one correspondence. Specifically, the second temperature sensor monitors the temperature of the high-temperature zone, and the second controller then controls the heating temperature of the heater 230 within the corresponding high-temperature zone based on the high-temperature zone temperature monitored by the second temperature sensor. This allows multiple temperature sensors and multiple heaters 230 to work in coordination, precisely controlling the temperature rise curve within the high-temperature volatilization section 200, thereby controlling the heating rate of the material within the high-temperature volatilization section 200 and ensuring that the material effectively volatilizes during the heating process in the high-temperature volatilization section 200 without bursting or pulverizing.

[0048] Optionally, the second temperature sensor is a thermocouple.

[0049] Optionally, controller two is a PLC controller.

[0050] like Figure 3 As shown, in this embodiment, the through-flow cooling section 300 includes multiple cooling temperature zones arranged sequentially along the material conveying direction, a cooling air chamber 310 arranged below the cooling temperature zones and connected to the ventilation assembly for conveying and regulating the flow rate of protective atmosphere, a gas collecting hood 320 arranged above the cooling temperature zones and connected to the ventilation assembly, and a heat exchanger 330 arranged on the gas collecting hood 320 for cooling the protective atmosphere. The cooling air chamber 310 and the cooling temperature zones are arranged in a one-to-one correspondence. Specifically, the material is gradually cooled to a set temperature range in the multiple cooling temperature zones. The flow rate of protective atmosphere is conveyed and regulated by the cooling air chamber 310 to adjust the cooling temperature in the corresponding cooling temperature zone. The protective atmosphere prevents the material from oxidizing. After the protective atmosphere is collected by the gas collecting hood 320, it is cooled by the heat exchanger 330 and then flows into the ventilation assembly to achieve the recycling of the protective atmosphere.

[0051] Optionally, the heat exchanger 330 is water-cooled, specifically a shell-and-tube water-cooled module. Optionally, the recovery device also includes an inlet pipe connected to the input end of the heat exchanger 330 and an outlet pipe connected to the output end of the heat exchanger 330.

[0052] Optionally, there are four cooling zones.

[0053] like Figure 3As shown, in this embodiment, the ventilation assembly includes a gas storage tank 510 for storing a protective atmosphere, a first ventilation pipe 520 connected to the gas storage tank 510 and the high-temperature volatilization section 200, a second ventilation pipe 530 connected to the gas storage tank 510 and the cooling chamber 310, a cyclone dust collector 540 connected to the second gas collection hood 220, and a return fan 550 connected to the cyclone dust collector 540 and the gas storage tank 510 for recovering the protective atmosphere. Specifically, the protective atmosphere is stored in the gas storage tank 510. The protective atmosphere is introduced into the high-temperature volatilization section 200 through the first vent pipe 520 and into the cooling gas chamber 310 through the second vent pipe 530. After being cooled by the heat exchanger 330, the protective atmosphere enters the cyclone dust collector 540. The dust mixed in the protective atmosphere is removed and purified by the cyclone dust collector 540. The protective atmosphere is then recovered into the gas storage tank 510 by the return fan 550 for storage and reuse.

[0054] like Figure 3 As shown, optionally, the ventilation assembly also includes a gas replenishment component 560 connected to a gas storage pipe for replenishing the protective atmosphere into the gas storage tank 510. The protective atmosphere in the cross-flow cooling section 300 is a slightly positive pressure atmosphere, and the high-temperature volatilization section 200 is a slightly negative pressure atmosphere. The nitrogen gas that escapes from the cross-flow cooling section 300 enters the high-temperature volatilization section 200 and finally enters the flue gas treatment assembly. The lost protective atmosphere is replenished into the gas storage tank 510 by the gas replenishment component 560.

[0055] Optionally, the cooling chamber 310 includes a cooling pipe and a cooling ball valve disposed on the cooling pipe for controlling the gas flow.

[0056] Optionally, controller four is a PLC controller.

[0057] Optionally, the protective atmosphere may be nitrogen or carbon monoxide.

[0058] In this embodiment, the recovery device further includes a third temperature control component. This third temperature control component includes a temperature sensor three disposed within the cooling zone for monitoring the temperature of the cooling zone, and a controller three connected to both the temperature sensor three and the cooling chamber 310 for controlling the flow rate of the protective atmosphere within the cooling chamber 310 based on the cooling zone temperature monitored by the temperature sensor three. Specifically, by monitoring the cooling zone temperature through the temperature sensor three, and then controlling the flow rate of the protective atmosphere within the cooling chamber 310 based on the cooling zone temperature monitored by the controller three, multiple temperature sensors three and multiple cooling zones can work in coordination, precisely controlling the cooling curve of the through-flow cooling section 300 and preventing the material from cooling too quickly.

[0059] Optionally, a gas vent valve for controlling gas flow is installed on the vent pipe 520.

[0060] Optionally, the ventilation assembly also includes an aerobic analyzer installed at the output end of the flue gas treatment assembly, and a controller connected to the aerobic analyzer, the venting ball valve, and the cooling ball valve respectively, for controlling the opening degree of the venting ball valve and the cooling ball valve according to the oxygen content.

[0061] Optionally, temperature sensor three is a thermocouple.

[0062] Optionally, controller three is a PLC controller.

[0063] like Figure 3 As shown, in this embodiment, the air cooling section 400 includes a material conveying layer two for material conveying, a ventilation hood two 410 arranged above the material conveying layer two, a cooling fan 420 communicating with the ventilation hood two 410 for conveying cooling gas, and a gas collecting hood four 430 arranged below the material conveying layer and communicating with the low-temperature drying section 100. Specifically, the cooling fan 420 introduces cooling gas into the material conveying layer two through the ventilation hood two 410 to cool the material to a third set temperature. The hot air, after being heated, is collected by the gas collecting hood four 430 and then introduced into the low-temperature drying section 100 to achieve heat recycling, reduce energy consumption, and save energy.

[0064] Optionally, the cooling fan 420 is a variable frequency axial flow fan.

[0065] like Figure 3 As shown, in this embodiment, the flue gas treatment component includes a negative pressure channel 610 connected to the high-temperature volatile section 200 and the low-temperature drying section 100, a flue gas dust collector 620 connected to the negative pressure channel 610, and a flue gas induced draft fan 630 connected to the flue gas dust collector 620. Specifically, under the operation of the flue gas induced draft fan 630, the volatiles in the high-temperature volatile section 200 and the water vapor in the low-temperature drying section 100 are drawn in by the negative pressure through the negative pressure channel 610. After being purified by the flue gas dust collector 620, the volatiles are then discharged to the outside through the flue gas induced draft fan 630.

[0066] It should be understood that the flue gas dust collector 620 can also recover zinc from volatiles.

[0067] Optionally, the flue gas treatment assembly also includes an exhaust pipe 640 connected to the flue gas induced draft fan 630 and arranged vertically to discharge gas.

[0068] Optionally, controller one and / or controller two and / or controller three and / or controller four are integrated into the same control unit.

[0069] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A zinc-containing flue ash recovery device, characterized in that, The device includes a low-temperature drying section (100), a high-temperature evaporation section (200), a cross-flow cooling section, and an air cooling section (400) arranged sequentially along the material conveying direction. The low-temperature drying section (100) is used to heat the material below a first set temperature to remove moisture from the material. The high-temperature evaporation section (200) is used to heat the material to a second set temperature and hold it at that temperature for a preset time to remove volatiles from the material. The cross-flow cooling section (300) is used to introduce a protective atmosphere to cool the material to a set temperature range. The air cooling section (400) is used to introduce cooling air to cool the material to a third set temperature. The recovery device also includes components arranged within the low-temperature drying section (100). A first temperature control component for controlling the heating rate of the material by controlling the heating curve in the low-temperature drying section (100), a second temperature control component for controlling the heating curve and holding temperature in the high-temperature volatilization section (200) by controlling the heating rate of the material, a ventilation component for introducing protective atmosphere into the high-temperature volatilization section (200) and the through-flow cooling section (300) respectively, and a flue gas treatment component for absorbing water vapor and volatiles and discharging them to the outside after treating the volatiles, which is connected to the low-temperature drying section (100) and the high-temperature volatilization section (200) respectively.

2. The zinc-containing flue ash recovery device according to claim 1, characterized in that, The low-temperature drying section (100) includes a material conveying layer 1 for conveying materials, an air distribution chamber (110) arranged below the material conveying layer 1 for adjusting the ratio of cold air and hot air, an air supply component for heating and conveying hot air that is connected to the air distribution chamber (110) and the low-temperature drying section (100) respectively, and an air collection hood 1 (130) arranged above the material conveying layer 1 and connected to the flue gas treatment component. Multiple air distribution chambers (110) are arranged sequentially along the material conveying direction.

3. The zinc-containing flue ash recovery device according to claim 2, characterized in that, The first temperature control component includes a temperature sensor 1 installed in the air distribution chamber (110) for monitoring the air temperature, and a controller 1 connected to the temperature sensor 1 and the air distribution chamber (110) for controlling the ratio of cold air and hot air in the air distribution chamber (110) according to the air temperature monitored by the temperature sensor 1. The temperature sensor 1 and the air distribution chamber (110) are installed in a one-to-one correspondence.

4. The zinc-containing flue ash recovery device according to claim 1, characterized in that, The high-temperature evaporation section (200) includes multiple high-temperature zones arranged sequentially along the material conveying direction, a ventilation hood (210) located below the high-temperature zones and connected to the ventilation assembly for introducing a protective atmosphere, and a gas collection hood (220) located above the high-temperature zones and connected to the flue gas treatment assembly. The first few high-temperature zones are used to heat the material, and the latter few high-temperature zones are used to keep the material warm. Heaters (230) are arranged in each high-temperature zone.

5. The zinc-containing flue ash recovery device according to claim 4, characterized in that, The second temperature control component includes a temperature sensor 2 installed in the high temperature zone for monitoring the temperature of the high temperature zone, and a controller 2 connected to the temperature sensor 2 and the heater (230) respectively for controlling the heating temperature of the heater (230) in the corresponding high temperature zone according to the temperature of the high temperature zone monitored by the temperature sensor 2. The temperature sensor 2 and the high temperature zone are installed in a one-to-one correspondence.

6. The zinc-containing flue ash recovery device according to any one of claims 1-5, characterized in that, The cross-flow cooling section (300) includes multiple cooling temperature zones arranged sequentially along the material conveying direction, a cooling air chamber (310) arranged below the cooling temperature zones and connected to the ventilation component for conveying and regulating the flow rate of protective atmosphere, a gas collecting hood three (320) arranged above the cooling temperature zones and connected to the ventilation component, and a heat exchanger (330) arranged on the gas collecting hood three (320) for cooling the protective atmosphere. The cooling air chamber (310) and the cooling temperature zones are arranged one-to-one.

7. The zinc-containing flue ash recovery device according to claim 6, characterized in that, The ventilation assembly includes a gas storage tank (510) for storing a protective atmosphere, a first ventilation pipe (520) connected to the gas storage tank (510) and the high-temperature volatilization section (200) respectively, a second ventilation pipe (530) connected to the gas storage tank (510) and the cooling chamber (310) respectively, a cyclone dust collector (540) connected to a second gas collection hood (220) respectively, and a return fan (550) for recovering the protective atmosphere connected to the cyclone dust collector (540) and the gas storage tank (510) respectively.

8. The zinc-containing flue ash recovery device according to claim 6, characterized in that, The recovery device also includes a third temperature control component, which includes a temperature sensor three installed in the cooling zone for monitoring the temperature of the cooling zone, and a controller three connected to the temperature sensor three and the cooling air chamber (310) respectively for controlling the flow rate of protective atmosphere in the cooling air chamber (310) according to the temperature of the cooling zone monitored by the temperature sensor three.

9. The zinc-containing flue ash recovery device according to any one of claims 1-5, characterized in that, The air cooling section (400) includes a material conveying layer 2 for material conveying, a ventilation hood 2 (410) arranged above the material conveying layer 2, a cooling fan (420) for conveying cooling gas connected to the ventilation hood 2 (410), and a gas collecting hood 4 (430) arranged below the material conveying layer and connected to the low temperature drying section (100).

10. The zinc-containing flue ash recovery device according to any one of claims 1-5, characterized in that, The flue gas treatment assembly includes a negative pressure channel (610) connected to a high-temperature volatilization section (200) and a low-temperature drying section (100), a flue gas dust collector (620) connected to the negative pressure channel (610), and a flue gas induced draft fan (630) connected to the flue gas dust collector (620).

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