Circuit board waste treatment device

Abstract

The utility model is suitable for the technical field of waste treatment, and provides a circuit board waste treatment device which comprises an incinerator, a waste heat exchanger and a waste heat exchanger. The hot air furnace is communicated with the incinerator through a hot air pipeline, the hot air furnace is provided with a secondary combustion chamber, and high-temperature flue gas generated by the incinerator is subjected to secondary combustion in the secondary combustion chamber; the rotary kiln comprises a supporting frame and a kiln body rotationally arranged on the supporting frame, and the inlet end is communicated with the hot blast stove; the feeding module comprises a discharging pipe, and the discharging pipe penetrates through the secondary combustion chamber and extends into the inlet end of the rotary kiln. The tail gas treatment module is arranged at the outlet end of the rotary kiln and used for treating gas exhausted by the rotary kiln. The high-temperature flue gas generated by the incinerator is subjected to secondary combustion through the hot blast stove to remove carbon black, and then enters the kiln body of the rotary kiln to dry materials in the kiln body, so that the heat generated by combustion of the circuit board waste can be fully utilized.

Description

Technical Field

[0001] This application belongs to the technical field of waste treatment, and particularly relates to a circuit board waste treatment device. Background Art

[0002] In addition to a large amount of plastics or polyester fibers, the scrapped circuit board waste also contains a small amount of non-ferrous metals and precious metal materials in the circuit.

[0003] Currently, for the metals on the circuit board, they are mainly recovered by wet metallurgy of the slag after burning the circuit board. The high-temperature flue gas generated by burning is cooled and dust-removed before being discharged into the air. However, the high-temperature flue gas has a large amount of heat and also contains unburned particles, and direct discharge causes environmental pollution. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a circuit board waste treatment device, aiming to solve the problem of energy waste caused by direct discharge of the high-temperature flue gas generated by circuit board waste.

[0005] The embodiments of this application are implemented as follows. A circuit board waste treatment device includes:

[0006] An incinerator for incinerating old circuit boards;

[0007] A hot blast stove is connected to the incinerator through a hot blast pipeline. The hot blast stove has a secondary combustion chamber, and the high-temperature flue gas generated by the incinerator undergoes secondary combustion in the secondary combustion chamber;

[0008] A rotary kiln includes a support frame and a kiln body rotatably arranged on the support frame. The kiln body has an inlet end and an outlet end, the inlet end is higher than the outlet end, and the inlet end is connected to the hot blast stove;

[0009] A feeding module includes a feeding pipe. The feeding pipe passes through the secondary combustion chamber and extends into the inlet end of the rotary kiln;

[0010] An exhaust gas treatment module is arranged at the outlet end of the rotary kiln for treating the gas discharged from the rotary kiln.

[0011] In some preferred embodiments, the feeding pipe includes a first pipe body and a second pipe body. The first pipe body is fixedly arranged on the hot blast stove, the second pipe body is rotatably arranged on the first pipe body and is connected to the first pipe body, and a driving module for driving the second pipe body to rotate is arranged on the hot blast stove.

[0012] In some preferred embodiments, a heat conduction pipe is arranged inside the second pipe body. Both ends of the heat conduction pipe respectively penetrate through the side wall of the second pipe body to communicate with the secondary combustion chamber, and the air outlet end of the heat conduction pipe is located at the inlet end of the rotary kiln.

[0013] In some preferred embodiments, heat dissipation fins are uniformly distributed on the outer peripheral wall of the heat conduction tube.

[0014] In some preferred embodiments, a refractory retaining ring is provided at the inlet end of the rotary kiln.

[0015] In some preferred embodiments, a separation hood is provided at the outlet end of the rotary kiln. The upper end of the separation hood is connected to the tail gas treatment module, and the lower end of the separation hood is connected to a blanking device. The tail gas treatment module includes a draft fan for sucking flue gas into the tail gas treatment module.

[0016] In some preferred embodiments, the incinerator includes a high-temperature flue gas hood and a material conveyor belt located inside the high-temperature flue gas hood.

[0017] In some preferred embodiments, the high-temperature flue gas hood includes a steel shell, and a concrete filling layer is provided inside the steel shell. The thickness of the concrete filling layer is 100 mm.

[0018] In some preferred embodiments, a plurality of smoke outlet holes are provided at intervals along the length direction of the high-temperature flue gas hood, and the plurality of smoke outlet holes are all connected to the hot air pipeline.

[0019] In some preferred embodiments, the tail gas treatment module includes a cooler, a bag filter, and a tail gas absorption tower connected in sequence.

[0020] A circuit board waste treatment device provided by an embodiment of the present application incinerates circuit board waste through an incinerator to generate high-temperature flue gas, and the high-temperature flue gas is introduced into a hot blast stove through a high-temperature flue gas pipe for secondary combustion to remove carbon black. The high-temperature flue gas after removing carbon black enters the kiln body of the rotary kiln to dry the materials therein. In this way, the heat generated by the combustion of circuit board waste can be fully utilized. And the blanking pipe passes through the secondary combustion chamber and extends into the inlet end of the rotary kiln. The materials pass through the secondary combustion chamber through the blanking pipe for pre-drying, improving the drying effect. And the amount of carbon black in the high-temperature flue gas will be reduced, reducing the environmental pollution caused by the high-temperature flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a circuit board waste treatment device provided by an embodiment of the present application;

[0022] Figure 2 For Figure 1 It is a schematic structural diagram of the tail gas treatment module provided in the embodiment;

[0023] Figure 3 For Figure 1 It is a partial cross-sectional view of the hot blast stove in the embodiment;

[0024] Figure 4 For Figure 3 the structural schematic diagram of the blanking pipe in the embodiment.

[0025] In the figure:

[0026] 100, incinerator; 101, smoke outlet; 102, hot air duct;

[0027] 200, hot blast stove; 210, secondary combustion chamber;

[0028] 300, rotary kiln; 301, inlet end; 310, refractory retaining ring

[0029] 400, feeding module; 410, blanking pipe; 411, first pipe body; 412, second pipe body; 420, heat conduction pipe; 421, air inlet; 422, air outlet;

[0030] 500, tail gas treatment module; 510, cooler; 520, bag filter; 530, tail gas absorption tower. Specific implementation manners

[0031] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application 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 application and are not used to limit the present application.

[0032] The following describes the specific implementation of the present application in detail with reference to specific embodiments.

[0033] As Figure 1 shown, in the embodiment of the present application, a circuit board waste treatment device is provided, and the device includes: an incinerator 100, a hot blast stove 200, a rotary kiln 300, a feeding module 400 and a tail gas treatment module 500.

[0034] The incinerator 100 is used to incinerate old circuit boards. The hot blast stove 200 is connected to the incinerator 100 through a hot air duct 102. The hot blast stove 200 has a secondary combustion chamber 210. The high-temperature flue gas generated by the incinerator 100 undergoes secondary combustion in the secondary combustion chamber 210. The rotary kiln 300 includes a support frame and a kiln body rotatably arranged on the support frame. The kiln body has an inlet end 301 and an outlet end. The inlet end 301 is higher than the outlet end. The inlet end 301 is connected to the hot blast stove 200. The feeding module 400 includes a blanking pipe 410. The blanking pipe 410 passes through the secondary combustion chamber 210 and extends into the inlet end 301 of the rotary kiln 300. The tail gas treatment module 500 is arranged at the outlet end of the rotary kiln 300 and is used to treat the gas discharged from the rotary kiln 300.

[0035] It is understandable that the circuit board waste is incinerated by the incinerator 100 to generate high-temperature flue gas, which is passed into the hot blast furnace 200 through the hot air duct 102 for secondary combustion to remove carbon black, and the high-temperature flue gas after the carbon black is removed enters the cellar body of the rotary kiln 300 to dry the materials therein, so that the heat of the combustion of the circuit board waste can be fully utilized. In addition, the feed pipe 410 passes through the secondary combustion chamber 210 and extends into the inlet end 301 of the rotary kiln 300, and the materials pass through the secondary combustion chamber 210 through the feed pipe 410 for pre-drying to improve the drying effect of the materials.

[0036] Reference Figure 3 and Figure 4 As shown, in some embodiments of the present application, the feed pipe 410 includes a first tube body 411 and a second tube body 412, wherein the first tube body 411 is fixedly disposed on the hot air furnace 200, and the second tube body 412 is rotatably disposed on the first tube body 411 and communicated with the first tube body 411, and a driving module for driving the second tube body 412 to rotate is disposed on the hot air furnace 200. It can be understood that by driving the second tube body 412 to move, the material therein can be stirred, and the heat at various locations of the peripheral wall of the second tube body 412 can be fully utilized to dry the material.

[0037] Specifically, one end of the first tube body 411 passes through the hot air furnace 200 for receiving materials, and the other end is sleeved with the second tube body 412, which can coaxially rotate relative to the first tube body 411, and gear teeth are formed on the outer peripheral surface of the second tube body 412. The driving module is a motor, and a gear is fixedly connected to the output end of the motor, and the gear meshes with the gear teeth on the second tube body 412, so that the motor can drive the second tube body 412 to move.

[0038] Reference Figure 3 and Figure 4 As shown, in some embodiments of the present application, a heat pipe 420 is provided in the second tube body 412, and both ends of the heat pipe 420 respectively pass through the side walls of the second tube body 412 to communicate with the secondary combustion chamber 210, and one end of the air outlet 422 of the heat pipe 420 is located at the inlet end 301 of the rotary kiln 300.

[0039] It can be understood that when the high-temperature flue gas in the secondary combustion chamber 210 flows into the rotary kiln 300, it will drive the air near the air outlet 422 of the heat pipe 420 to flow rapidly to generate negative pressure, and the high-temperature flue gas in the secondary combustion chamber 210 will be sucked into the heat pipe 420 from the air inlet 421 of the heat pipe to heat the heat pipe 420. In this way, the heat pipe 420 can heat the material in the discharge pipe 410 to improve the drying effect, and the heat pipe 420 can improve the stirring effect of the second tube body 412 on the material.

[0040] In some embodiments of the present application, heat dissipation fins are evenly distributed on the outer peripheral wall of the heat conduction tube 420. It can be understood that the heat dissipation fins can improve the heat conduction effect, and are beneficial to the stirring of the material by the second tube body 412, facilitating the crushing of the material.

[0041] Referring to Figure 3 and Figure 4 As shown, in some embodiments of the present application, a refractory retaining ring 310 is provided at the inlet end 301 of the rotary kiln 300. It can be understood that the refractory retaining ring 310 can contract the inlet end 301 of the rotary kiln 300, increase the air flow rate of the high-temperature flue gas at the inlet end 301 of the rotary kiln 300, enhance the negative pressure effect, and enable more high-temperature flue gas to flow into the heat conduction tube 420.

[0042] Referring to Figure 1 As described, in some embodiments of the present application, a separation hood is provided at the outlet end of the rotary kiln 300. The upper end of the separation hood is connected to the tail gas treatment module 500, and the lower end of the separation hood is connected to a blanking device. The tail gas treatment module 500 includes a draft fan that sucks the flue gas into the tail gas treatment module 500.

[0043] It can be understood that the high-temperature flue gas and the material flow out from the outlet end of the rotary kiln 300 together and enter the separation hood. The draft fan of the tail gas treatment module 500 in the separation hood sucks the high-temperature flue gas upward, and the material will fall downward into the blanking device due to gravity. In this way, the separation of the flue gas and the material can be achieved.

[0044] In some embodiments of the present application, the incinerator 100 includes: a high-temperature flue gas hood and a material conveyor belt located inside the high-temperature flue gas hood. It can be understood that the circuit board waste is loaded from one end of the material conveyor belt, the material enters the high-temperature flue gas hood for incineration, and the slag remains on the material conveyor belt and is conveyed to the other end for unloading. In this way, the incineration efficiency can be improved.

[0045] In some embodiments of the present application, the high-temperature flue gas hood includes a steel shell, and a concrete filling layer is provided inside the steel shell. The thickness of the concrete filling layer is 100 mm. Specifically, the high-temperature flue gas hood is formed by rolling a circular arc-shaped steel plate on site, and the lining refractory cast concrete has a thickness of 100 mm. In this way, the high-temperature flue gas hood can be quickly made on site, and filling 100 mm of concrete can effectively prevent fire and heat insulation and prevent heat loss.

[0046] In some embodiments of the present application, a plurality of smoke outlets 101 are arranged at intervals along the length direction of the high-temperature flue gas hood, and the plurality of smoke outlets 101 are all communicated with the hot air duct 102. It can be understood that a plurality of smoke outlets 101 are arranged at intervals along the length direction of the high-temperature flue gas hood. In this way, the high-temperature flue gas generated by combustion can leave the high-temperature flue gas hood from the nearest smoke outlet 101, preventing excessive flue gas in the high-temperature flue gas hood and affecting the incineration effect.

[0047] In some embodiments of the present application, the tail gas treatment module 500 includes a cooler 510, a bag filter 520, and a tail gas absorption tower 530 that are sequentially connected and arranged in communication. It can be understood that the high-temperature flue gas is cooled by the cooler 510 to reduce the temperature of the waste gas. After being dust-collected by the bag filter 520, it is sent to the tail gas absorption tower 530. After the flue gas treatment, the tail gas meets the standards and is discharged, preventing the waste gas from polluting the atmospheric environment.

[0048] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A circuit board waste processing device, characterized in that: The device comprises: Incinerator, used to incinerate old circuit boards; A hot blast furnace is connected to the incinerator through a hot blast duct, and the hot blast furnace has a secondary combustion chamber, and the high-temperature flue gas generated by the incinerator is subjected to secondary combustion in the secondary combustion chamber; A rotary kiln, comprising a support frame and a kiln body rotatably arranged on the support frame, wherein the kiln body has an inlet end and an outlet end, wherein the inlet end is higher than the outlet end, and the inlet end is connected to the hot blast furnace; A feeding module, comprising a feeding pipe, the feeding pipe passes through the secondary combustion chamber and extends into the inlet end of the rotary kiln; The tail gas treatment module is arranged at the outlet end of the rotary kiln and is used for treating the gas discharged from the rotary kiln.

2. A circuit board waste processing device according to claim 1, characterized in that: The feeding pipe includes a first tube body and a second tube body. The first tube body is fixedly arranged on the hot air furnace, and the second tube body is rotatably arranged on the first tube body and connected with the first tube body. A driving module for driving the second tube body to rotate is arranged on the hot air furnace.

3. A circuit board waste processing device according to claim 2, characterized in that: A heat conducting pipe is arranged in the second tube body, and two ends of the heat conducting pipe respectively pass through the side wall of the second tube body to communicate with the secondary combustion chamber, and one end of the air outlet of the heat conducting pipe is located at the inlet end of the rotary kiln.

4. A circuit board waste processing device according to claim 3, characterized in that: Heat dissipation fins are evenly distributed on the outer peripheral wall of the heat conducting pipe.

5. A circuit board waste processing device according to claim 4, characterized in that: A refractory retaining ring is provided at the inlet end of the rotary kiln.

6. The circuit board waste processing device according to claim 1, characterized in that: The outlet end of the rotary kiln is provided with a separation hood, the upper end of the separation hood is connected to the tail gas treatment module, the lower end of the separation hood is connected to a feeding device, and the tail gas treatment module includes an induced draft fan that sucks the flue gas into the tail gas treatment module.

7. A circuit board waste processing device according to claim 1, characterized in that: The incinerator comprises: a high-temperature fume hood and a material conveyor belt located in the high-temperature fume hood.

8. The circuit board waste processing device according to claim 7, characterized in that: The high-temperature fume hood comprises a steel outer shell, a concrete filling layer is provided in the steel outer shell, and the thickness of the concrete filling layer is 100 mm.

9. A circuit board waste processing device according to claim 8, characterized in that: The high-temperature fume hood is provided with a plurality of smoke outlets at intervals along its length direction, and the plurality of smoke outlets are all connected to the hot air duct.

10. The circuit board waste processing device according to claim 1, characterized in that: The tail gas treatment module comprises a cooler, a bag dust collector and a tail gas absorption tower which are connected in sequence.

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