A method for using circuit board resin to replace pulverized coal and its resin powder spray gun

Abstract

The present invention provides a method for using circuit board resin to replace pulverized coal. The method for using circuit board resin to replace pulverized coal includes the following steps: S1 After disassembling waste circuit boards, select the circuit boards; S2 Crush and separate the circuit boards to form resin particles; S3 Grind the resin particles obtained in step S2 to form resin powder; S4 Blow the resin powder into the smelting furnace through a spray gun for incineration; S5 After incineration, convey the flue gas to the secondary combustion chamber for secondary combustion and special treatment. The method for using circuit board resin to replace pulverized coal provided by the present invention has the use of replacing the pulverized coal of the spray gun in the smelting process with the difficult-to-treat resin powder. After 5 years of production tests, it is feasible to use oxygen-enriched top-blown bath smelting for waste circuit boards. Through the research on the composition of circuit board resin, it shows that waste circuit board resin can replace the pulverized coal of the spray gun, and all the indicators of the discharged flue gas meet the national combustion standards for hazardous waste.

Description

Technical Field

[0001] The present invention relates to the technical field of harmless and resourceful treatment of circuit boards, and particularly to a method for using circuit board resin to replace pulverized coal and a method for its resin powder spray gun. Background Art

[0002] Circuit boards are the foundation of modern electrical manufacturing industries and are widely used in various electronic products. With the continuous development of the economic society, the output of circuit boards has increased rapidly. China has become a major producer and consumer of electronic products, and a large number of waste circuit boards are continuously generated. How to harmlessly and resourcefully treat waste circuit boards in electronic waste has become an urgent problem to be solved globally.

[0003] The annual output of waste circuit boards accounts for about 5%-8% of electronic waste. Circuit board resin accounts for about 50% of the mass of circuit boards, metal elements account for about 30% of the mass of circuit boards, and there are also certain amounts of glass fiber and inorganic fillers. In 2020, the output of circuit board resin in China has exceeded 1 million tons.

[0004] By detecting the components of circuit board resin, it is found that circuit board resin contains 35% carbon and has strong reducibility. The content of organic substances such as epoxy resin, phenolic resin, and cellulose in circuit board resin is high, and the calorific value generated by combustion is large, which can replace the role of pulverized coal in the spray gun.

[0005] Therefore, it is necessary to provide a method for using circuit board resin to replace pulverized coal and a method for its resin powder spray gun to solve the above technical problems. Summary of the Invention

[0006] The present invention provides a method for using circuit board resin to replace pulverized coal, which solves the problem that circuit board resin is not convenient for harmless and resourceful treatment.

[0007] To solve the above technical problems, the method for using circuit board resin to replace pulverized coal provided by the present invention includes the following steps:

[0008] S1 After disassembling waste circuit boards, select out circuit boards;

[0009] S2 Crush and sort the circuit boards to form resin particles;

[0010] S3 Grind the crushed resin particles in step S2 to form resin powder;

[0011] S4 Use a spray gun to blow the resin powder into the smelting furnace for incineration;

[0012] S5 After incineration, convey the flue gas to the secondary combustion chamber for secondary combustion and special treatment.

[0013] Preferably, the circuit board resin selected out in step S1 contains organic substances and carbon.

[0014] Preferably, the particle size of the resin particles after crushing in step S2 is 0.1 mm - 3 mm.

[0015] Preferably, the particle size of the resin powder after grinding in step S3 is 0.1 mm - 1 mm.

[0016] Preferably, in step S4, valuable elements in the resin are recovered after incinerating the resin powder, and the flue gas enters the secondary combustion chamber. Under the condition of supplementing oxygen-enriched air, the flue gas burns sufficiently, the temperature > 1100 °C, and dioxins are completely decomposed. To avoid the slow cooling of the flue gas after the secondary combustion chamber and the re-generation of dioxins, the flue gas needs to pass through a quench tower. After the rapid cooling of the flue gas, it then passes through a spray absorption tower, an activated carbon adsorption tower, and a bag filter, and is discharged up to the standard through a chimney.

[0017] Preferably, the inlet temperature of the secondary combustion chamber > 1300 °C, the outlet > 1100 °C. Under the maximum load, the residence time of the flue gas > 3 seconds, and the residual oxygen in the flue gas is 6 - 12%.

[0018] A resin powder spray gun using circuit board resin instead of pulverized coal, comprising:

[0019] A resin powder pipe, a process air pipe, and a main air pipe. The process air pipe is arranged outside the resin powder pipe, and the main air pipe is arranged outside the process air pipe. The resin powder pipe is used to blow circuit board resin powder into the smelting furnace;

[0020] The main air pipe air inlet, the output end of the main air pipe air inlet is communicated with the input end of the process air pipe;

[0021] The sleeve air pipe air inlet, the output end of the sleeve air pipe air inlet is communicated with the input end of the main air pipe;

[0022] A swirl vane, the swirl vane is arranged inside the process air pipe, and the swirl vane is located at the output end of the resin powder pipe.

[0023] Preferably, a flow limiting ring is arranged inside the main air pipe air inlet, a flow hole is opened inside the flow limiting ring, an adjustment chute is opened on the flow limiting ring, and the inside of the adjustment chute is communicated with the inside of the flow hole;

[0024] A connection cover is arranged outside the main air pipe air inlet, a partition is fixedly connected to the inner wall of the connection cover, a through hole is opened on the partition, and a first diversion hole and a second diversion hole are respectively opened between one side of the connection cover and the main air pipe air inlet;

[0025] The inner wall of the connecting cover is fixedly connected with a return spring. One side of the return spring is fixedly connected with a piston plate. The piston plate is installed between the connecting cover and the partition plate. One side of the piston plate is fixedly connected with an adjusting slide plate. One end of the adjusting slide plate sequentially penetrates through the surface of the connecting cover and the surface of the main air duct air inlet and extends into the main air duct air inlet. The surface of the adjusting slide plate is slidably connected with the inner surface of the adjusting chute.

[0026] Preferably, the first diversion hole is located above the current-limiting ring. The inside of the first diversion hole is communicated with one side of the piston plate through the inside of the through hole.

[0027] Preferably, the second diversion hole is located below the current-limiting ring. The inside of the second diversion hole is communicated with the other side of the piston plate.

[0028] Compared with the related art, the method for using circuit board resin to replace pulverized coal provided by the present invention has the following beneficial effects:

[0029] The present invention provides a method for using circuit board resin to replace pulverized coal, which uses difficult-to-treat resin powder to replace the use of pulverized coal in the lance during the smelting process. After 5 years of production tests, it is feasible to use oxygen-enriched top-blown bath smelting for waste circuit boards. Through the research on the composition of circuit board resin, it shows that waste circuit board resin can replace the lance pulverized coal, and all the indexes of the discharged flue gas meet the national combustion standards for hazardous waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of a first embodiment of a resin powder lance for using circuit board resin to replace pulverized coal provided by the present invention;

[0031] Figure 2 is a schematic structural diagram of a second embodiment of a resin powder lance for using circuit board resin to replace pulverized coal provided by the present invention;

[0032] Figure 3 is Figure 2 the enlarged schematic view of part A shown in;

[0033] Figure 4 is Figure 2 the three-dimensional view of the current-limiting ring shown in;

[0034] Figure 5 is a schematic structural diagram of a resin powder pipe of a resin powder lance for using circuit board resin to replace pulverized coal provided by the present invention;

[0035] Figure 6 is Figure 5 the enlarged schematic view of part B shown in;

[0036] Figure 7 isFigure 5 Exploded view of the fixed outer tube and the movable inner tube shown.

[0037] Reference numerals in the figure:

[0038] 1. Resin powder tube;

[0039] 2. Process air duct;

[0040] 3. Main air duct;

[0041] 4. Inlet of the main air duct;

[0042] 5. Inlet of the sleeve air duct;

[0043] 6. Swirl vane;

[0044] 7. Flow limiting ring, 71. Flow hole, 72. Adjusting chute;

[0045] 8. Connecting cover, 81. Partition plate, 811. Through hole, 82. First diversion hole, 83. Second diversion hole;

[0046] 9. Return spring, 91. Piston plate, 92. Adjusting slide plate;

[0047] 100. Fixed outer tube, 110. First connection disk, 111. Installation groove, 112. Embedded groove;

[0048] 200. Movable inner tube, 210. Second connection disk, 220. Inlay ring. Detailed implementation manners

[0049] The present invention will be further described below in conjunction with the accompanying drawings and implementation manners.

[0050] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , where Figure 1 is a schematic structural diagram of the first embodiment of the resin powder spray gun using circuit board resin to replace pulverized coal provided by the present invention; Figure 2 is a schematic structural diagram of the second embodiment of the resin powder spray gun using circuit board resin to replace pulverized coal provided by the present invention; Figure 3 is Figure 2 the enlarged schematic view of part A shown; Figure 4 is Figure 2 the three-dimensional view of the flow limiting ring shown; Figure 5 is a schematic structural diagram of the resin powder tube of the resin powder spray gun using circuit board resin to replace pulverized coal provided by the present invention; Figure 6 is Figure 5 the enlarged schematic view of part B shown;Figure 7 The Figure 5 exploded view of the split of the fixed outer tube and the movable inner tube shown in the figure.

[0051] A method of using circuit board resin to replace pulverized coal includes the following steps:

[0052] S1 After disassembling the waste circuit board, the circuit board is sorted out;

[0053] S2 The circuit board is crushed and sorted to form resin particles;

[0054] S3 The crushed resin particles in step S2 are ground to form resin powder;

[0055] S4 The resin powder is blown into the smelting furnace through a spray gun for incineration;

[0056] S5 After incineration, the flue gas is transported to the secondary combustion chamber for secondary combustion and special treatment.

[0057] The resin powder formed after crushing, disassembling and sorting the waste circuit board replaces the function of the pulverized coal of the spray gun. The spray gun blows the circuit board resin powder into the smelting furnace for incineration, which not only provides temperature and reducing agent for smelting, but also solves the problem of difficult treatment of waste circuit boards.

[0058] The circuit board resin sorted out in step S1 contains organic matter and carbon.

[0059] The circuit board resin has a high content of organic matter and a high calorific value, about 3400 kcal / kg;

[0060] The circuit board resin has a high carbon content, about 35% carbon;

[0061] Compared with pulverized coal, the calorific value and carbon content of the circuit board resin are about half of that of pulverized coal. Therefore, when using circuit board resin to replace the pulverized coal of the spray gun, the consumed circuit board resin is twice that of pulverized coal, and the efficiency of treating the circuit board resin powder is high.

[0062] The particle size of the crushed resin particles in step S2 is 0.1 mm - 3 mm.

[0063] The particle size of the ground resin powder in step S3 is 0.1 mm - 1 mm.

[0064] The particle size of the circuit board resin is quite different from that of the pulverized coal. The circuit board resin is about 10 times that of the pulverized coal. When the circuit board resin replaces the pulverized coal of the spray gun, the pulverized coal pipe of the pulverized coal spray gun is appropriately increased or the circuit board resin is ground so that its particle size is on average 0.1 mm - 1 mm. To prevent the resin powder from clogging the pipeline, the inner diameter of the resin powder pipe of the spray gun should be adjusted according to the actual situation;

[0065] The transformation of the structure of the resin powder spray gun. The apparent density of the circuit board resin is about 0.45 g / cm 3, and the apparent density of pulverized coal is 0.8 g / cm 3 , which is approximately twice the density of the circuit board resin. The particle size of the resin powder is 10 times that of the pulverized coal. The selection of the injection air pressure is related to the required hourly injection volume and the pipe diameter. To ensure that the injection effect of the resin powder reaches or exceeds that of the pulverized coal, the air pressure used for injecting the resin powder needs to be selected according to the feed rate and the pipe diameter.

[0066] Replacing pulverized coal with circuit board resin powder requires increasing the pulverized coal pipe of the spray gun. First, the consumption of circuit board resin powder is approximately twice that of pulverized coal to achieve its effect. Second, the particle size of the circuit board resin powder is larger than that of the pulverized coal to prevent it from clogging.

[0067] In step S4, valuable elements in the resin are recovered after incinerating the resin powder. The flue gas enters the secondary combustion chamber. Under the condition of supplying enriched oxygen, the flue gas burns fully, and the temperature > 1100 °C, so that dioxins are completely decomposed. To avoid the slow cooling of the flue gas after the secondary combustion chamber and the re-generation of dioxins, the flue gas needs to pass through a quench tower. After the flue gas is quickly cooled, it then passes through a spray absorption tower, an activated carbon adsorption tower, and a bag filter, and then is discharged up to the standard through a chimney.

[0068] The inlet temperature of the secondary combustion chamber > 1300 °C, the outlet > 1100 °C. Under the maximum load, the residence time of the flue gas > 3 seconds, and the residual oxygen in the flue gas is 6 - 12%.

[0069] The epoxy resin content in the circuit board resin is large, and it is extremely difficult to be recycled. Incineration will generate harmful gases such as dioxins. If not properly treated, it will cause secondary pollution.

[0070] The circuit board resin burns fully in the smelting furnace, and valuable elements in the resin are recovered. The flue gas enters the secondary combustion chamber. Under the condition of supplying enriched oxygen, the flue gas burns fully, and the temperature is greater than 1100 °C, so that dioxins are completely decomposed. To avoid the slow cooling of the flue gas after the secondary combustion chamber and the re-generation of dioxins, the flue gas needs to pass through a quench tower. After the flue gas is quickly cooled, it then passes through a spray absorption tower, an activated carbon adsorption tower, and a bag filter, and then is discharged up to the standard through a chimney;

[0071] The flue gas temperature in the quench tower can be reduced from 650 °C to below 200 °C within 1 second;

[0072] The spray tower absorbs harmful gases such as SO2, HBr, and HCl in the flue gas and recovers bromine salts.

[0073] Circuit board resin powder belongs to internationally recognized persistent organic pollutants. The state has included waste circuit board resin powder in the "List of Hazardous Wastes" and belongs to 1#HW13 organic resin category.

[0074] In the smelting industry, not all pulverized coal guns are suitable to be replaced by resin powder guns. The combustion of circuit board resin powder will produce chlorinated and brominated products and dioxins, and ordinary smelting enterprises cannot meet the discharge standards when treating the subsequent flue gas. At present, enterprises that are suitable for using circuit board resin powder spray guns include those with special flue gas treatment and hazardous waste treatment qualifications, such as rotary kiln incinerators for treating hazardous waste and oxygen-enriched top-blown smelting furnaces.

[0075] The flue gas of the present invention is specially treated by a flue gas purification system and meets the national emission standard GB18484-2021.

[0076] The national science and technology support project of the Ministry of Science and Technology of China, "Key Technologies for the High-value and Clean Utilization of All Components of Waste Circuit Boards", has carried out certain research work in the field of harmless treatment and resource utilization of electronic waste. Through the "fire-wet combined method" and using a closed rotary furnace for incineration, the waste circuit boards are first incinerated in a closed manner to completely burn the organic components in the waste circuit boards. The gas is treated by special environmental protection equipment and has no impact on the environment.

[0077] The working principle of the method for using circuit board resin to replace pulverized coal provided by the present invention is as follows:

[0078] The circuit board resin contains a large amount of organic matter, has a high calorific value, and a high carbon content, making it suitable to replace pulverized coal in smelting. The toxic and harmful gases such as dioxins generated after the combustion of the circuit board resin in the present invention need to be specially treated before being discharged.

[0079] Compared with the related technologies, the method for using circuit board resin to replace pulverized coal provided by the present invention has the following beneficial effects:

[0080] Using the difficult-to-treat resin powder to replace the use of pulverized coal in the spray gun during the smelting process, after 5 years of production tests, it is feasible to use oxygen-enriched top-blown bath smelting for waste circuit boards. Through the research on the composition of the circuit board resin, it is shown that the waste circuit board resin can replace the spray gun pulverized coal, and all the indexes of the discharged flue gas meet the national combustion standards for hazardous waste.

[0081] Example 1:

[0082] A resin powder spray gun using circuit board resin to replace pulverized coal, comprising:

[0083] A resin powder pipe 1, a process air pipe 2 and a main air pipe 3. The process air pipe 2 is arranged outside the resin powder pipe 1, and the main air pipe 3 is arranged outside the process air pipe 2. The resin powder pipe 1 is used to blow the circuit board resin powder into the smelting furnace.

[0084] A main air pipe air inlet 4, and the output end of the main air pipe air inlet 4 is communicated with the input end of the process air pipe 2.

[0085] The air inlet 5 of the sleeve air duct, the output end of the air inlet 5 of the sleeve air duct is communicated with the input end of the main air duct 3;

[0086] The swirl vane 6, the swirl vane 6 is arranged inside the process air duct 2, and the swirl vane 6 is located at the output end of the resin powder pipe 1.

[0087] After the waste printed circuit board is subjected to resource treatment through multiple steps such as disassembly, crushing and separation, the remaining is basically the circuit board resin, and its particle size is different, about between 0.1mm and 3mm;

[0088] In order to make it form powder, it needs to be ground so that its particle size is between 0.1 and 1mm.

[0089] The circuit board resin powder is blown into the melting furnace through the resin powder pipe 1, and air and oxygen are blown in through pipelines such as the process air duct 2, the main air duct air inlet 4, and the sleeve air duct air inlet 5 to assist combustion, so that it burns completely in the melting furnace;

[0090] After the flue gas is treated specially to meet the standards, it is discharged through a 50-meter-high chimney.

[0091] The swirl vane 6 can improve convective heat transfer, enhance the heat exchange amount, reduce the wall temperature of the spray gun pipeline, and is conducive to the complete reaction after the oxygen-enriched air contacts the circuit board resin.

[0092] Embodiment 2:

[0093] A flow limiting ring 7 is arranged inside the main air duct air inlet 4, a flow hole 71 is opened inside the flow limiting ring 7, an adjustment chute 72 is opened on the flow limiting ring 7, and the inside of the adjustment chute 72 is communicated with the inside of the flow hole 71;

[0094] A connection cover 8 is arranged outside the main air duct air inlet 4, a partition plate 81 is fixedly connected to the inner wall of the connection cover 8, a through hole 811 is opened on the partition plate 81, and a first diversion hole 82 and a second diversion hole 83 are respectively opened between one side of the connection cover 8 and the main air duct air inlet 4;

[0095] A return spring 9 is fixedly connected to the inner wall of the connection cover 8, a piston plate 91 is fixedly connected to one side of the return spring 9, the piston plate 91 is installed between the connection cover 8 and the partition plate 81, a regulating slide plate 92 is fixedly connected to one side of the piston plate 91, one end of the regulating slide plate 92 sequentially penetrates through the surface of the connection cover 8 and the surface of the main air duct air inlet 4 and extends into the main air duct air inlet 4, and the surface of the regulating slide plate 92 is slidably connected with the inner surface of the adjustment chute 72.

[0096] By equipping the air inlet 4 of the main air duct with a connecting cover 8 and a flow-limiting ring 7, when air is input at the input end of the air inlet 4 of the main air duct and the air pressure is greater than the air pressure at the output end of the air inlet 4 of the main air duct, the gas at the input end moves the piston plate 91 away from the air inlet 4 of the main air duct under the action of the pressure difference. The piston plate 91 drives the adjusting slide plate 92 to slide synchronously. When the adjusting slide plate 92 slides, it gradually disengages from the inside of the adjusting chute 72, causing the flow hole 71 to open and the opening size to gradually increase;

[0097] The opening diameter of the flow hole 71 can be controlled according to the pressure of the gas input at the air inlet 4 of the main air duct. Among them, through the limiting action of the return spring 9, the maximum moving distance of the piston plate 91 will not exceed the position of the through hole 811. At the same time, the return spring 9 provides elastic force and pressure for the piston plate 91 to reset, facilitating the quick reset of the piston plate 91 when not in use.

[0098] When the air pressure at the output end of the air inlet 4 of the main air duct is greater than the air pressure at the input end, part of the gas at the output end presses on the piston plate 91 after passing through the inside of the first diversion hole 82 and the through hole 811. The piston plate 91 drives the adjusting slide plate 92 to slide into the inside of the adjusting chute 72. When the adjusting slide plate 92 completely moves into the inside of the adjusting chute 72, the adjusting slide plate 92 forms a closed state for the flow hole 71, so as to automatically close the air inlet 4 of the main air duct, avoid the phenomenon of air pressure backflow when connecting to the incinerator and causing safety accidents, and improve the stability and safety of the air inlet 4 of the main air duct during use.

[0099] The first diversion hole 82 is located above the flow-limiting ring 7, and the inside of the first diversion hole 82 is interconnected with one side of the piston plate 91 through the inside of the through hole 811.

[0100] The second diversion hole 83 is located below the flow-limiting ring 7, and the inside of the second diversion hole 83 is interconnected with the other side of the piston plate 91.

[0101] Beneficial effects:

[0102] When the air pressure at the output end of the air inlet 4 of the main air duct is greater than the air pressure at the input end, part of the gas at the output end presses on the piston plate 91 after passing through the inside of the first diversion hole 82 and the through hole 811. The piston plate 91 drives the adjusting slide plate 92 to slide into the inside of the adjusting chute 72. When the adjusting slide plate 92 completely moves into the inside of the adjusting chute 72, the adjusting slide plate 92 forms a closed state for the flow hole 71, so as to automatically close the air inlet 4 of the main air duct, avoid the phenomenon of air pressure backflow when connecting to the incinerator and causing safety accidents, and improve the stability and safety of the air inlet 4 of the main air duct during use.

[0103] The resin powder pipe 1 includes a fixed outer pipe 100 and a movable inner pipe 200;

[0104] The first end of the fixed outer tube 100 is fixedly connected with a first connection plate 110. An installation groove 111 and an embedded groove 112 are formed in the first connection plate 110, and the interior of the installation groove 111 communicates with the interior of the embedded groove 112;

[0105] One end of the movable inner tube 200 is fixedly connected with a second connection plate 210, and an inlay ring 220 is fixedly connected to one side of the second connection plate 210.

[0106] The outer diameter of the movable inner tube 200 is the same as the inner diameter of the fixed outer tube 100, and the inner diameter of the movable inner tube 200 is one-half of the inner diameter of the fixed outer tube 100. The movable inner tube 200 can be stably installed inside the fixed outer tube 100. The movable inner tube 200 installed movably facilitates installation and disassembly, so as to adjust the inner diameter of the resin powder tube 1 to adapt to the use of different incineration raw materials;

[0107] The outer surface of the second connection plate 210 is adapted to the inner surface of the installation groove 111, so as to facilitate the stable installation of the second connection plate 210 inside the installation groove 111;

[0108] The surface of the inlay ring 220 is snap-fitted with the inner surface of the embedded groove 112, which facilitates the rapid positioning and calibration of the connection holes on the second connection plate 210 and the connection holes on the first connection plate 110, and facilitates the connection and limitation between the first connection plate 110 and the second connection plate 210.

[0109] Beneficial effects:

[0110] The movable inner tube 200 can be stably installed inside the fixed outer tube 100. The movable inner tube 200 installed movably facilitates installation and disassembly on the fixed outer tube 100, so as to adjust the inner diameter of the resin powder tube 1 to adapt to the use of different incineration raw materials.

[0111] Table 1 Detection data of resin powder - 1

[0112]

[0113] Table 2 Detection data of resin powder - 2

[0114]

[0115]

[0116] Table 1 and Table 2 are the detection data of 1# HW13 resin powder. According to the detection data of the circuit board resin powder, its calorific value of combustion is 3432 kcal / kg, the carbon content is 32.75%, and the epoxy resin content is more than 55%, which is more suitable for replacing pulverized coal.

[0117] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A method of using circuit board resin to replace pulverized coal, characterized in that, It includes the following steps: S1: After disassembling the waste circuit board, the circuit board is separated out; S2: The circuit board is crushed and sorted to form resin particles; S3: The crushed resin particles in step S2 are ground to form resin powder; S4: The resin powder is blown into the smelting furnace by a spray gun for incineration; S5: After incineration, the flue gas is transported to the secondary combustion chamber for secondary combustion and special treatment; A resin powder spray gun using circuit board resin instead of pulverized coal, which is used to blow the resin powder into the smelting furnace for incineration in step S4, includes: A resin powder pipe, a process air pipe and a main air pipe. The process air pipe is arranged outside the resin powder pipe, and the main air pipe is arranged outside the process air pipe. The resin powder pipe is used to blow the circuit board resin powder into the smelting furnace; The main air pipe air inlet, and the output end of the main air pipe air inlet is communicated with the input end of the process air pipe; The sleeve air pipe air inlet, and the output end of the sleeve air pipe air inlet is communicated with the input end of the main air pipe; A swirl vane, which is arranged inside the process air pipe and is located at the output end of the resin powder pipe; A flow limiting ring is arranged inside the main air pipe air inlet. A flow hole is opened inside the flow limiting ring, and an adjustment chute is opened on the flow limiting ring. The inside of the adjustment chute is communicated with the inside of the flow hole; A connection cover is arranged outside the main air pipe air inlet. A partition is fixedly connected to the inner wall of the connection cover. A through hole is opened on the partition. A first diversion hole and a second diversion hole are respectively opened between one side of the connection cover and the main air pipe air inlet; A return spring is fixedly connected to the inner wall of the connection cover. One side of the return spring is fixedly connected to a piston plate. The piston plate is installed between the connection cover and the partition. One side of the piston plate is fixedly connected to an adjustment slide plate. One end of the adjustment slide plate sequentially penetrates the surface of the connection cover and the surface of the main air pipe air inlet and extends into the main air pipe air inlet. The surface of the adjustment slide plate is slidably connected with the inner surface of the adjustment chute; 2. The method of using circuit board resin to replace pulverized coal according to claim 1, characterized in that The circuit board resin separated out in step S1 contains organic matter and carbon.

3. The method of using circuit board resin to replace pulverized coal according to claim 1, wherein The particle size of the crushed resin particles in step S2 is 0.1mm - 3mm.

4. The method of using circuit board resin to replace pulverized coal according to claim 1, characterized in that, The particle size of the ground resin powder in step S3 is 0.1mm - 1mm.

5. The method of using circuit board resin to replace pulverized coal according to claim 1, characterized in that, In step S4, valuable elements in the resin are recovered after incinerating the resin powder. The flue gas enters the secondary combustion chamber. Under the condition of supplementing rich oxygen, the flue gas burns fully, and the temperature > 1100°C, so that dioxin is completely decomposed. To avoid the slow cooling of the flue gas after the secondary combustion chamber and the re-generation of dioxin, the flue gas needs to pass through a quench tower. After the flue gas is rapidly cooled, it then passes through a spray absorption tower, an activated carbon adsorption tower and a bag filter, and then is discharged up to standard through a chimney.

6. The method of using circuit board resin to replace pulverized coal according to claim 5, characterized in that, The inlet temperature of the secondary combustion chamber > 1300°C, the outlet > 1100°C. Under the maximum load, the residence time of the flue gas > 3 seconds, and the residual oxygen in the flue gas is 6 - 12%.

7. The method of using circuit board resin to replace pulverized coal according to claim 1, characterized in that, The first diversion hole is located above the flow limiting ring, and the inside of the first diversion hole is communicated with one side of the piston plate through the inside of the through hole.

8. The method of using circuit board resin to replace pulverized coal according to claim 7, characterized in that, The second diversion hole is located below the flow limiting ring, and the inside of the second diversion hole is communicated with the other side of the piston plate.

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