High-zinc solid waste recovery device

Abstract

The utility model provides a high-zinc solid waste recovery device, and relates to the technical field of solid waste resourceful treatment. The device comprises a base and a device body, the device body comprises a microwave pyrolysis box, a zinc steam negative pressure trapping box, a multi-stage condensing box and a tail gas purifying box which are sequentially communicated, a spiral feeder and a conveying pipeline which are communicated are arranged in the microwave pyrolysis box, a magnetron structure is arranged on the spiral feeder, and the conveying pipeline is communicated with the microwave pyrolysis box. A negative-pressure flow guide cover and an airflow flow guide box are arranged in the zinc steam negative-pressure trapping box; and the multi-stage condensation box comprises a first condensation box and a second condensation box. The mode of combining microwave pyrolysis, negative pressure trapping and multi-stage condensation is adopted, zinc-containing flue gas is led out to recover metal zinc through the heat exchanger, the problem of unsmooth operation of the smelting furnace caused by zinc enrichment is solved, the operation resistance of the furnace is reduced, the problem of smooth production is solved, and the purpose of saving energy is achieved.

Description

Technical Field

[0001] This utility model relates to the field of solid waste resource utilization technology, and in particular to a high-zinc solid waste recycling device. Background Technology

[0002] In the process of blast furnace ironmaking, vertical shaft furnace steelmaking, or direct reduction vertical shaft furnace smelting, zinc will repeatedly circulate and accumulate in the furnace, resulting in poor furnace conditions and affecting production efficiency.

[0003] During blast furnace smelting, zinc oxide or metallic zinc is present in the material. Zinc oxide is reduced to metallic zinc by reducing gases, and metallic zinc is vaporized into zinc vapor at high temperature. The zinc vapor rises in the furnace with the flue gas and condenses into liquid or solid zinc when it encounters low-temperature material. As the material descends and the temperature rises, it is vaporized into zinc vapor again. This cycle repeats in the furnace. When it accumulates to a certain extent, it will deteriorate the permeability of the furnace charge and affect the normal operation of the furnace. This has been a problem in blast furnace smelting for many years.

[0004] Current mainstream treatment processes for high-zinc solid waste (such as rotary kilns and electric arc furnaces) have the following drawbacks:

[0005] 1. Low zinc recovery rate (<85%): Zinc vapor is easily oxidized again under high temperature environment to form zinc ash;

[0006] 2. High energy consumption: It needs to maintain a high temperature of over 1200℃, and fuel costs account for more than 40% of the total cost.

[0007] 3. Dust pollution: Dust content in exhaust gas > 50g / Nm³ 3 Environmental treatment is difficult. Utility Model Content

[0008] To address the shortcomings mentioned above, this utility model provides a high-zinc solid waste recycling device that combines microwave pyrolysis, negative pressure collection, and multi-stage condensation. By drawing out zinc-containing flue gas and recovering metallic zinc through a heat exchanger, it solves the problem of smelting furnace malfunction caused by zinc enrichment, reduces furnace operating resistance, solves the problem of smooth production, and achieves energy saving.

[0009] To address the aforementioned problems, this utility model provides a high-zinc solid waste recycling device, comprising a base and a device body. The device body is positioned on the upper part of the base, and includes a microwave pyrolysis chamber, a zinc vapor negative pressure collection chamber, a multi-stage condensation chamber, and a tail gas purification chamber connected in sequence. A support base is provided at the left end of the base, and the microwave pyrolysis chamber and the zinc vapor negative pressure collection chamber are located at the top of the support base. A screw feeder and a conveying pipeline are connected inside the microwave pyrolysis chamber, and a magnetron structure is provided on the screw feeder. A negative pressure guide hood and an airflow guide box are provided inside the zinc vapor negative pressure collection chamber, and the top of the zinc vapor negative pressure collection chamber is connected to the microwave pyrolysis chamber. The multi-stage condensation chamber includes a first condensation chamber and a second condensation chamber. The left end of the first condensation chamber is connected to the right end of the zinc vapor negative pressure collection chamber, the right end of the first condensation chamber is connected to the left end of the second condensation chamber, and the right end of the second condensation chamber is connected to the tail gas purification chamber.

[0010] Preferably, the inner wall of the microwave pyrolysis box is provided with a mounting frame at the front end, a screw conveyor is provided on the mounting frame, and the bottom feed end of the screw conveyor is connected to the bottom end of the microwave pyrolysis box. The discharge end of the screw conveyor is connected to the discharge hopper through a conveying pipeline, and the bottom end of the discharge hopper is connected to the inside of the collection box.

[0011] Preferably, the zinc vapor negative pressure collection box is provided with a negative pressure collection structure, which includes a negative pressure guide hood and an airflow guide box. A first mounting plate is provided at the right end of the zinc vapor negative pressure collection box, and an airflow guide box is provided on the first mounting plate. The air inlet of the airflow guide box is connected to the interior of the zinc vapor negative pressure collection box through the negative pressure guide hood.

[0012] Preferably, the first condensing chamber is provided with a first eddy current condenser and a first electrostatic precipitator. The first electrostatic precipitator includes a first upper electrostatic precipitator and a first lower electrostatic precipitator. The first eddy current condenser is located at the center of the first condensing chamber, the first upper electrostatic precipitator is located at the upper end of the first eddy current condenser, and the first lower electrostatic precipitator is located at the lower end of the first eddy current condenser.

[0013] Preferably, the second condensing chamber is provided with a second eddy current condenser and a second electrostatic precipitator. The second electrostatic precipitator includes a second upper electrostatic precipitator and a second lower electrostatic precipitator. The second eddy current condenser is located at the center of the second condensing chamber, the second upper electrostatic precipitator is located at the upper end of the second eddy current condenser, and the second lower electrostatic precipitator is located at the lower end of the second eddy current condenser.

[0014] Preferably, the exhaust gas purification box is provided with an exhaust gas filtration structure and an exhaust gas exhaust structure. The exhaust gas filtration structure is located inside the exhaust gas purification box, and a second mounting plate is provided at the right end of the exhaust gas purification box. The exhaust gas exhaust structure is provided on the second mounting plate, and the air inlet of the exhaust gas exhaust structure is connected to the interior of the exhaust gas purification box.

[0015] Preferably, the exhaust gas filtration structure includes an exhaust gas filter box, a first exhaust gas filter screen is provided at the left end of the exhaust gas filter box and the left end of the exhaust gas filter box is connected to the interior of the second condenser box through the first exhaust gas filter screen, and the right end of the exhaust gas filter box is connected to the air inlet of the exhaust gas structure through the second exhaust gas filter screen.

[0016] Preferably, the exhaust structure includes a vacuum pump unit, which is mounted on a second mounting plate via a mounting base. The mounting base includes a first mounting base and a second mounting base. The upper end of the vacuum pump unit is connected to the upper side of the second mounting plate via the first mounting base, and the lower end of the vacuum pump unit is connected to the lower side of the second mounting plate via the second mounting base. The air inlet of the vacuum pump unit is connected to the interior of the exhaust gas filter box via a second exhaust gas filter screen.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model adopts a combination of microwave pyrolysis, negative pressure capture, and multi-stage condensation. By drawing out zinc-containing flue gas and recovering metallic zinc through a heat exchanger, it solves the problem of non-smooth operation of the smelting furnace caused by zinc enrichment, reduces the furnace operating resistance, solves the problem of smooth production, and achieves the purpose of energy saving.

[0019] 2. This utility model includes an exhaust gas filter box, which filters the incoming flue gas through a double-layer filter screen, thereby ensuring that the particulate matter concentration of the exhaust gas from the exhaust fan is ≤8mg / Nm³ after purification. 3 Emissions meet the standards. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0022] like Figure 1 As shown, an embodiment of this utility model includes a base and a device body. The device body is disposed on the upper end of the base and includes a microwave pyrolysis box, a zinc vapor negative pressure collection box, a multi-stage condensation box and an exhaust gas purification box connected in sequence.

[0023] In this embodiment, a support base is provided at the left end of the base. The support base includes a first support base and a second support base. The first support base is located at the left end of the second support base, and the second support base is located at the left end of the base. A microwave pyrolysis box is provided at the top of the first support base, and a zinc vapor negative pressure collection box is provided at the top of the second support base. The microwave pyrolysis box is connected to a new vapor negative pressure collection box through a pipeline.

[0024] In this embodiment, a screw feeder and a conveying pipeline are connected inside the microwave pyrolysis box. A mounting frame is provided at the front end of the inner wall of the microwave pyrolysis box. A screw conveyor is provided on the mounting frame, and the bottom inlet end of the screw conveyor is connected to the bottom end of the microwave pyrolysis box. A conveying pipeline is provided on the upper side of the screw conveyor, and the discharge end of the screw conveyor is connected to the inlet of the conveying pipeline. The discharge outlet of the conveying pipeline is connected to the top of the discharge hopper. The bottom end of the discharge hopper is connected to the inside of the collection box. The magnetron structure includes a first magnetron, a second magnetron, and a third magnetron. The first magnetron is provided on the side wall of the microwave pyrolysis box, the second magnetron is provided at the bottom end of the microwave pyrolysis box, and the third magnetron is provided on the side wall of the screw conveyor.

[0025] In this embodiment, a negative pressure collection structure is provided on the zinc vapor negative pressure collection box. The negative pressure collection structure includes a negative pressure guide hood and an airflow guide box. The top of the zinc vapor negative pressure collection box is connected to the bottom of the collection box. A first mounting plate is provided on the right end of the zinc vapor negative pressure collection box. An airflow guide box is provided on the first mounting plate. The air inlet of the airflow guide box is connected to the interior of the zinc vapor negative pressure collection box through the negative pressure guide hood.

[0026] In this embodiment, the multi-stage condenser includes a first condenser and a second condenser. The left end of the first condenser is connected to the right end of the zinc vapor negative pressure capture box, the right end of the first condenser is connected to the left end of the second condenser, and the right end of the second condenser is connected to the exhaust gas purification box.

[0027] In this embodiment, a first eddy current condenser and a first electrostatic precipitator are provided inside the first condensing chamber. The first electrostatic precipitator includes a first upper electrostatic precipitator and a first lower electrostatic precipitator. The first eddy current condenser is located at the center of the first condensing chamber, the first upper electrostatic precipitator is located at the upper end of the first eddy current condenser, and the first lower electrostatic precipitator is located at the lower end of the first eddy current condenser.

[0028] In this embodiment, a second eddy current condenser and a second electrostatic precipitator are provided inside the second condensing chamber. The second electrostatic precipitator includes a second upper electrostatic precipitator and a second lower electrostatic precipitator. The second eddy current condenser is located at the center of the second condensing chamber, the second upper electrostatic precipitator is located at the upper end of the second eddy current condenser, and the second lower electrostatic precipitator is located at the lower end of the second eddy current condenser.

[0029] In this embodiment, the exhaust gas purification box is provided with an exhaust gas filter structure and an exhaust gas exhaust structure. The exhaust gas filter structure is located inside the exhaust gas purification box, and a second mounting plate is provided at the right end of the exhaust gas purification box. The exhaust gas exhaust structure is provided on the second mounting plate, and the air inlet of the exhaust gas exhaust structure is connected to the interior of the exhaust gas purification box.

[0030] In this embodiment, the exhaust gas filtration structure includes an exhaust gas filter box. A first exhaust gas filter screen is provided at the left end of the exhaust gas filter box, and the left end of the exhaust gas filter box is connected to the interior of the second condenser box through the first exhaust gas filter screen. The right end of the exhaust gas filter box is connected to the air intake end of the exhaust gas structure through the second exhaust gas filter screen.

[0031] In this embodiment, the exhaust structure includes a vacuum pump unit, which is mounted on a second mounting plate via a mounting base. The mounting base includes a first mounting base and a second mounting base. The upper end of the vacuum pump unit is connected to the upper side of the second mounting plate via the first mounting base, and the lower end of the vacuum pump unit is connected to the lower side of the second mounting plate via the second mounting base. The air inlet of the vacuum pump unit is connected to the interior of the exhaust gas filter box via a second exhaust gas filter screen.

[0032] In this embodiment, microwave selective heating reduces the activation energy of the ZnO / C reaction in solid waste by 40% and lowers the pyrolysis temperature to 800-900℃; gradient condensation design increases the zinc vapor recovery rate to 92-95% and the purity of metallic zinc to >99.5%; and a closed negative pressure system ensures that the dust concentration in the working environment is ≤1mg / m³. 3 (National standard limit 4mg / m³) 3 ).

[0033] In this embodiment, the sludge, after being dried and crushed to a particle size ≤3mm, enters the microwave pyrolysis chamber and is then fed into the collection box via a screw feeder and conveying pipeline. The microwave power is set to 80kW, the pyrolysis temperature to 850℃±20℃, and the residence time to 40min. Zinc vapor then enters a multi-stage condenser under the action of a negative pressure guide hood. This multi-stage condenser includes a first condenser and a second condenser. The first condenser produces lumpy zinc ingots (85% recovery rate), while the second condenser recovers ultrafine zinc powder (0.1-1μm particle size, 10% recovery rate). An electrostatic precipitator operates during both the first and second condensation processes. Finally, under the action of the airflow guide hood, the exhaust gas is purified to a particulate matter concentration ≤8mg / Nm³. 3 Emissions meet standards.

[0034] Those skilled in the art can connect all electrical components and their compatible power supplies in this case via wires, and should select appropriate controllers according to actual conditions to meet control requirements. The specific connection and control sequence, and the sequential operation order between each electrical component to complete the electrical connection, are well-known technologies in the field, and will not be described further regarding electrical control.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0036] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing the technical solution of this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this patent application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this patent application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0039] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-zinc solid waste recycling device, comprising a base and a device body, wherein the device body is disposed on the upper end of the base, characterized in that, The device body includes a microwave pyrolysis box, a zinc vapor negative pressure collection box, a multi-stage condensation box, and a tail gas purification box connected in sequence. A support base is provided at the left end of the base, and the microwave pyrolysis box and the zinc vapor negative pressure collection box are provided at the top of the support base. A screw feeder and a conveying pipeline are provided inside the microwave pyrolysis box. A magnetron structure is provided on the screw feeder. A negative pressure guide hood and an airflow guide box are provided inside the zinc vapor negative pressure collection box, and the top of the zinc vapor negative pressure collection box is connected to the microwave pyrolysis box. The multi-stage condensation box includes a first condensation box and a second condensation box. The left end of the first condensation box is connected to the right end of the zinc vapor negative pressure collection box, the right end of the first condensation box is connected to the left end of the second condensation box, and the right end of the second condensation box is connected to the tail gas purification box.

2. The high-zinc solid waste recycling device as described in claim 1, characterized in that, The microwave pyrolysis chamber has an installation frame at the front end of its inner wall. A screw conveyor is installed on the installation frame, and the bottom inlet end of the screw conveyor is connected to the bottom end of the microwave pyrolysis chamber. The outlet end of the screw conveyor is connected to the outlet hopper through a conveying pipeline, and the bottom end of the outlet hopper is connected to the inside of the collection box.

3. The high-zinc solid waste recycling device as described in claim 2, characterized in that, The zinc vapor negative pressure collection box is equipped with a negative pressure collection structure, which includes a negative pressure guide hood and an airflow guide box. A first mounting plate is provided at the right end of the zinc vapor negative pressure collection box, and an airflow guide box is provided on the first mounting plate. The air inlet of the airflow guide box is connected to the interior of the zinc vapor negative pressure collection box through the negative pressure guide hood.

4. The high-zinc solid waste recycling device as described in claim 3, characterized in that, The first condensing chamber is equipped with a first eddy current condenser and a first electrostatic precipitator. The first electrostatic precipitator includes a first upper electrostatic precipitator and a first lower electrostatic precipitator. The first eddy current condenser is located at the center of the first condensing chamber, the first upper electrostatic precipitator is located at the upper end of the first eddy current condenser, and the first lower electrostatic precipitator is located at the lower end of the first eddy current condenser.

5. The high-zinc solid waste recycling device as described in claim 4, characterized in that, The second condensing chamber is equipped with a second eddy current condenser and a second electrostatic precipitator. The second electrostatic precipitator includes a second upper electrostatic precipitator and a second lower electrostatic precipitator. The second eddy current condenser is located at the center of the second condensing chamber. The second upper electrostatic precipitator is located at the upper end of the second eddy current condenser, and the second lower electrostatic precipitator is located at the lower end of the second eddy current condenser.

6. The high-zinc solid waste recycling device as described in claim 5, characterized in that, The exhaust gas purification box is equipped with an exhaust gas filtration structure and an exhaust gas exhaust structure. The exhaust gas filtration structure is located inside the exhaust gas purification box, and a second mounting plate is provided at the right end of the exhaust gas purification box. The exhaust gas exhaust structure is provided on the second mounting plate, and the air inlet of the exhaust gas exhaust structure is connected to the interior of the exhaust gas purification box.

7. A high-zinc solid waste recycling device as described in claim 6, characterized in that, The exhaust gas filtration structure includes an exhaust gas filter box, a first exhaust gas filter screen is provided at the left end of the exhaust gas filter box and the left end of the exhaust gas filter box is connected to the interior of the second condenser box through the first exhaust gas filter screen, and the right end of the exhaust gas filter box is connected to the air intake end of the exhaust gas structure through the second exhaust gas filter screen.

8. A high-zinc solid waste recycling device as described in claim 7, characterized in that, The exhaust structure includes a vacuum pump unit, which is mounted on a second mounting plate via a mounting base. The mounting base includes a first mounting base and a second mounting base. The upper end of the vacuum pump unit is connected to the upper side of the second mounting plate via the first mounting base, and the lower end of the vacuum pump unit is connected to the lower side of the second mounting plate via the second mounting base. The air inlet of the vacuum pump unit is connected to the interior of the exhaust gas filter box via a second exhaust gas filter screen.

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