Material conveying device and conveying method for solid waste coupled combustion

Abstract

The present invention discloses a material conveying device for solid waste coupled combustion, including a high-pressure air inlet pipe, a high-pressure air nozzle, and a material receiving device. The material receiving device is provided with a material introduction device. The high-pressure air inlet pipe is provided on the material receiving device and is located on one side of the material introduction device. The high-pressure air nozzle is connected to the high-pressure air inlet pipe and is provided inside the material receiving device. The material receiving device includes a material inlet. The high-pressure air nozzle is located on one side of the material inlet and below the material inlet. The material receiving device is connected to a mixing pipe, and the mixing pipe is connected to a diffuser pipe. The present invention also discloses a material conveying method. The material conveying device and conveying method for solid waste coupled combustion of the present invention can effectively shorten the mixing distance between solid waste materials and high-pressure air or hot air, improve the operating accuracy and flow rate adjustment range of the material conveying device of the present invention, and effectively solve the clogging problem of the material conveying device.

Description

Technical Field

[0001] The invention relates to a material conveying device and a conveying method for solid waste coupled combustion, belonging to the technical fields of solid waste treatment, garbage incineration and coupled combustion of coal-fired power plants. Background Art

[0002] With the rapid development of my country's economy, the output of urban domestic waste and rural domestic waste has been increasing year by year. According to statistics, since 2010, the overall amount of domestic waste collected and transported in the country has been increasing year by year. From 2010 to 2019, the annual compound growth rate of domestic waste collection and transportation in the country reached 4.69%. As of 2019, the national domestic waste collection and transportation volume reached 2.28 billion tons. In 2020, the garbage collection and transportation volume will continue to maintain a high growth rate, and the national garbage collection and transportation volume will reach 2.527 billion tons. At the same time, considering the national conditions of my country's large population, it is difficult to sort garbage at the source, and garbage resource utilization technology suitable for national conditions should be sought. Most of my country's large cities have built garbage incineration projects, but with the increase in garbage volume, the current garbage incineration projects have obviously insufficient garbage disposal capacity. Small and medium-sized cities are still mainly landfilled, so many small and medium-sized cities in my country have a serious phenomenon of "garbage siege". If these garbage are not effectively treated, it will greatly affect people's living environment and even threaten people's health. The "NIMBY effect" of newly built waste incineration power plants is prominent. Using existing coal-fired power generation units to coordinate the disposal of urban and rural solid waste not only solves the problem of difficult site selection, but also saves investment in new units. In addition, the environmental protection facilities of existing coal-fired units can be used to expand the future survival and profit space of urban coal-fired power plants, while achieving the "reduction, harmlessness, and resource utilization" of domestic waste, unifying economic benefits, environmental protection, and social impact. At present, there are a few application cases in China where industrial solid waste is sent into a circulating fluidized bed for mixed combustion with coal. However, there are problems such as unstable combustion and unstable operation of material conveying devices. Existing material conveying devices have problems such as small adjustable flow range, easy blockage, and unstable operation.

[0003] Based on the above reasons, the present invention provides a material conveying device and a conveying method for solid waste coupled combustion to solve the problems of easy clogging, small adjustable range, unstable operation, etc. of the material conveying device. Summary of the invention

[0004] The object of the present invention is to provide a material conveying device and a conveying method for solid waste coupled combustion, which are not easy to be blocked, have a large adjustable range, and operate more stably.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a material conveying device for solid waste coupled combustion, comprising a high-pressure air inlet pipe, a high-pressure air nozzle, and a material receiving device. The material receiving device is provided with a material introduction device, the high-pressure air inlet pipe is arranged on the material receiving device and is located on one side of the material introduction device, the high-pressure air nozzle is connected to the high-pressure air inlet pipe and is arranged inside the material receiving device, the material receiving device includes a material inlet, the high-pressure air nozzle is located on one side of the material inlet and below the material inlet, the material receiving device is connected to a mixing tube, and the mixing tube is connected to a diffuser tube.

[0006] In the aforementioned material conveying device for solid waste coupled combustion, the material introduction device includes an anti-bridging device, a lower hopper and a material inlet storage bin, the anti-bridging device is located above the material inlet and connected to the material inlet; the anti-bridging device is arranged in the lower hopper, and the material inlet storage bin is located above the lower hopper and connected to the lower hopper.

[0007] In the aforementioned material conveying device for coupled combustion of solid waste, the lower hopper includes a straight cylinder section hopper and a conical cylinder section hopper, the conical cylinder section hopper is located above the straight cylinder section hopper, and the conical cylinder section hopper is connected to the straight cylinder section hopper, and the anti-bridging device is installed in the straight cylinder section hopper of the lower hopper.

[0008] In the aforementioned material conveying device for solid waste coupled combustion, the material receiving device includes a receiving chamber and a receiving chamber inlet, the receiving chamber inlet is located below the material inlet, the receiving chamber inlet is connected to the receiving chamber, and the receiving chamber is connected to the mixing tube.

[0009] In the aforementioned material conveying device for solid waste coupled combustion, the anti-bridging device includes a rotating motor, a rotating shaft and a plurality of rotating blades, the plurality of rotating blades are mounted on the rotating shaft, and one end of the rotating shaft is connected to the rotating motor.

[0010] In the aforementioned material conveying device for solid waste coupled combustion, the distance between the center line of the rotating shaft and the bottom edge of the conical barrel section hopper is L, and the length of the distance L is less than or equal to D / 2, where D is the diameter of the straight barrel section hopper.

[0011] The aforementioned material conveying device for solid waste coupled combustion also includes a mixed material outlet, which is arranged at one end of the diffuser pipe.

[0012] In the aforementioned material conveying device for solid waste coupled combustion, the high-pressure air nozzle is a Laval nozzle.

[0013] In the aforementioned material conveying device for solid waste coupled combustion, the receiving chamber, the mixing tube connected to the receiving chamber, and the diffuser connected to the mixing tube form a Laval nozzle shape. The cross-sectional area of ​​the diffuser is larger than the cross-sectional area of ​​the mixing tube, and the cross-sectional area of ​​the diffuser gradually increases along the material conveying direction, so the speed of the mixed material will gradually decrease, and the pressure will gradually increase.

[0014] After the high-pressure air or hot air is ejected through the high-pressure air nozzle, a low-pressure area will be formed in the receiving chamber. The low-pressure area can be used to directly guide the material so that it enters the front end of the receiving chamber through the entrance of the receiving chamber, and due to the action of the high-pressure air or hot air ejected by the high-pressure air nozzle, the material will undergo turbulent motion after contacting the high-pressure air or hot air. At the same time, due to the action of the low-pressure area and the reflux area in the receiving chamber, the high-pressure air or hot air and the material will have sufficient contact and convert energy and momentum. Therefore, the mixing distance between the material and the high-pressure air or hot air in the material conveying device for solid waste coupled combustion of the present invention is shorter. Compared with the prior art, the present invention shortens the length of the mixing tube and the diffuser tube, and improves the operating accuracy of the material conveying device.

[0015] A material conveying method, using the material conveying device for solid waste coupled combustion as described above to convey solid waste materials, specifically comprises the following steps:

[0016] Step S01: introducing high-pressure air or hot air into the high-pressure air inlet pipe, and spraying the high-pressure air or hot air into the inner cavity of the material receiving device through the high-pressure air nozzle; the high-pressure air or hot air speed is increased and the pressure is reduced through the high-pressure air nozzle;

[0017] Step S02: allowing the crushed solid waste material to enter the material receiving device through the material introduction device;

[0018] Step S03: After being introduced into the material receiving device, the material enters the inner cavity of the material receiving device through the material inlet;

[0019] Step S04: In the inner cavity of the material receiving device, the material performs high-speed turbulent motion around the high-pressure air nozzle; the material is fully contacted and mixed with the high-pressure air or hot air ejected by the high-pressure air nozzle and the energy and momentum are converted, the speed of the high-pressure air and hot air is reduced, and the material moves in the direction of the high-pressure air or hot air, and then the material is ejected into the receiving chamber, where the material continues to contact and mix with the high-pressure air or hot air and the energy and momentum are converted, and the moving speed of the material gradually increases;

[0020] Step S05: After step S04, the material enters the mixing tube, where the material is further fully mixed with the high-pressure air or hot air, so that the speed of the high-pressure air or hot air is reduced and tends to be consistent with the moving speed of the material, thereby forming a mixed material with a consistent moving speed;

[0021] Step S06: The mixed material enters the diffuser. As the cross section of the diffuser gradually increases, the speed of the mixed material gradually decreases and the pressure gradually increases, forming a mixed material with a speed of 0-15 m / s and a pressure of 0-70 KPa at the outlet of the diffuser.

[0022] When different equipment is connected to the diffuser, the velocity and pressure of the mixed material formed at the outlet of the diffuser are different.

[0023] Compared with the prior art, the material conveying device and conveying method for solid waste coupled combustion of the present invention can effectively shorten the mixing distance between solid waste materials and high-pressure air or hot air, improve the operating accuracy and flow regulation range of the material conveying device of the present invention, effectively solve the blockage problem of the material conveying device, and at the same time shorten the length of the mixing tube and the diffuser tube, saving operating costs and energy consumption.

[0024] The traditional material conveying device only transports materials to the boiler furnace through the fan. The pipeline has no diameter change, and the air and material are not well mixed. As a result, after entering the furnace, the speed of the material and air is inconsistent, the wind speed is high, and the flow field inside the boiler is affected, thus causing unstable combustion.

[0025] The present invention adopts a Laval type pipeline, and the material and air can fully contact in the Laval pipeline to convert energy and momentum. The wind speed is reduced to a speed consistent with the material, and the air flow rate of the high-pressure air nozzle and the pressure and wind speed at the diffuser outlet can be controlled. The wind speed at the diffuser outlet is small, and the pressure at the diffuser outlet is slightly higher than the pressure of the furnace. Therefore, it will not affect the combustion stability of the furnace, and the stability of the furnace combustion can be guaranteed.

[0026] Traditional devices use straight pipes, and the wind speed and material speed cannot be consistent, resulting in large air consumption, high speed but low material speed. When there are large pieces of material, it may cause blockage; when a large range of adjustments are required, it is not suitable to adjust only by adjusting the wind speed because the wind speed and material speed cannot be consistent. Similarly, the present invention uses a Laval type nozzle, so that the material and wind speed are consistent after mixing, and there will be no situation where the wind speed is high and the material speed is low, so it is not easy to block; at the same time, the material delivery flow rate can be controlled according to the wind speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute an improper limitation to the present invention. In the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of a material conveying device for solid waste coupled combustion according to the present invention;

[0029] Figure 2 It is a schematic structural diagram of a lower hopper in a material conveying device for solid waste coupled combustion according to the present invention;

[0030] Figure 3 It is a schematic structural diagram of an anti-bridging device in a material conveying device for solid waste coupled combustion according to the present invention;

[0031] Figure 4 It is a schematic diagram of the structural principle of the material conveying device for solid waste coupled combustion of the present invention.

[0032] Figure markings: 1-high-pressure air inlet pipe, 2-high-pressure air nozzle, 3-anti-bridging device, 4-lower hopper, 5-material inlet storage bin, 6-receiving chamber inlet, 7-conical cylinder section hopper, 8-receiving chamber, 9-straight cylinder section hopper, 10-mixing tube, 11-material inlet, 12-diffuser, 13-mixed material outlet, 14-rotating motor, 15-rotating shaft, 16-rotating blades, 17-material receiving device, 18-receiving chamber, 19-material inlet, 20-reflux zone, 21-receiving chamber outlet, 22-mixing tube outlet.

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Embodiment 1 of the present invention: A material conveying device for coupled combustion of solid waste, comprising a high-pressure air inlet pipe 1, a high-pressure air nozzle 2, and a material receiving device 17. A material introduction device 18 is provided on the material receiving device 17. The high-pressure air inlet pipe 1 is provided on the material receiving device 17 and is located on one side of the material introduction device 18. The high-pressure air nozzle 2 is connected to the high-pressure air inlet pipe 1 and is provided inside the material receiving device 17. The material receiving device 17 includes a material inlet 11. The high-pressure air nozzle 2 is located on one side of the material inlet 11 and is located below the material inlet 11. The material receiving device 17 is connected to the mixing tube 10, and the mixing tube 10 is connected to the diffuser tube 12.

[0036] Embodiment 2 of the present invention: A material conveying device for solid waste coupled combustion, comprising a high-pressure air inlet pipe 1, a high-pressure air nozzle 2, and a material receiving device 17, wherein a material introduction device 18 is arranged on the material receiving device 17, the high-pressure air inlet pipe 1 is arranged on the material receiving device 17 and is located on one side of the material introduction device 18, the high-pressure air nozzle 2 is connected to the high-pressure air inlet pipe 1 and is arranged inside the material receiving device 17, the material receiving device 17 comprises a material inlet 11, the high-pressure air nozzle 2 is located on one side of the material inlet 11 and is located below the material inlet 11, the material receiving device 17 is connected to a mixing tube 10, and the mixing tube 10 is connected to a diffuser tube 12. Among them, the material introduction device 18 comprises an anti-bridging device 3, a lower hopper 4, and a material inlet storage bin 5, wherein the anti-bridging device 3 is located above the material inlet 11 and is connected to the material inlet 11; the anti-bridging device 3 is arranged in the lower hopper 4, and the material inlet storage bin 5 is located above the lower hopper 4 and is connected to the lower hopper 4.

[0037] Embodiment 3 of the present invention: A material conveying device for solid waste coupled combustion, comprising a high-pressure air inlet pipe 1, a high-pressure air nozzle 2, and a material receiving device 17. A material introduction device 18 is arranged on the material receiving device 17. The high-pressure air inlet pipe 1 is arranged on the material receiving device 17 and is located on one side of the material introduction device 18. The high-pressure air nozzle 2 is connected to the high-pressure air inlet pipe 1 and is arranged inside the material receiving device 17. The material receiving device 17 comprises a material inlet 11. The high-pressure air nozzle 2 is located on one side of the material inlet 11 and below the material inlet 11. The material receiving device 17 is connected to a mixing tube 10, and the mixing tube 10 is connected to a diffuser tube 12. Among them, the material introduction device 18 comprises an anti-bridging device 3, a lower hopper 4, and a material inlet storage bin 5. The anti-bridging device 3 is located above the material inlet 11 and is connected to the material inlet 11; the anti-bridging device 3 is arranged in the lower hopper 4, and the material inlet storage bin 5 is located above the lower hopper 4 and is connected to the lower hopper 4. The lower hopper includes a straight section hopper 9 and a conical section hopper 7. The conical section hopper 7 is located above the straight section hopper 9, and the conical section hopper 7 is connected to the straight section hopper 9. The anti-bridging device 3 is installed in the straight section hopper 9 of the lower hopper 4. When solid waste material enters the straight section hopper 9 from the conical section hopper 7, it may bridge at the interface where the conical section hopper 7 enters the straight section hopper 9, affecting the material from entering the material receiving device. At this time, the blocked material is broken by the rotation of the anti-bridging device 3.

[0038] Embodiment 4 of the present invention: A material conveying device for solid waste coupled combustion, comprising a high-pressure air inlet pipe 1, a high-pressure air nozzle 2, and a material receiving device 17. A material introduction device 18 is arranged on the material receiving device 17. The high-pressure air inlet pipe 1 is arranged on the material receiving device 17 and is located on one side of the material introduction device 18. The high-pressure air nozzle 2 is connected to the high-pressure air inlet pipe 1 and is arranged inside the material receiving device 17. The material receiving device 17 comprises a material inlet 11. The high-pressure air nozzle 2 is located on one side of the material inlet 11 and is located below the material inlet 11. The material receiving device 17 is connected to a mixing tube 10, and the mixing tube 10 is connected to a diffuser tube 12. The material introduction device 18 comprises an anti-bridging device 3, a lower hopper 4, and a material inlet storage bin 5. The anti-bridging device 3 is located above the material inlet 11 and is connected to the material inlet 11; the anti-bridging device 3 is arranged in the lower hopper 4, and the material inlet storage bin 5 is located above the lower hopper 4 and is connected to the lower hopper 4. The lower hopper includes a straight section hopper 9 and a conical section hopper 7. The conical section hopper 7 is located above the straight section hopper 9, and the conical section hopper 7 is connected to the straight section hopper 9. The anti-bridging device 3 is installed in the straight section hopper 9 of the lower hopper 4. The material receiving device 17 includes a receiving chamber 8 and a receiving chamber inlet 6. The receiving chamber inlet 6 is located below the material inlet 11. The receiving chamber inlet 6 is connected to the receiving chamber 8, and the receiving chamber 8 is connected to the mixing tube 10. The material enters the inner cavity of the material receiving device 17 from the material inlet 11 through the material introduction device 18, and the high-pressure air or hot air is sprayed into the inner cavity of the material receiving device 17 from the high-pressure air nozzle 2. In the inner cavity of the material receiving device 17, the high-pressure air and hot air with a certain speed contact and mix with the material, and the material and the high-pressure air or hot air undergo momentum and energy conversion, and the speed of the high-pressure air or hot air decreases accordingly. The material moves along the flow direction of the high-pressure air or hot air, and the speed increases accordingly. The material is introduced into the receiving chamber 8 through the receiving chamber inlet 6, and is further fully mixed with the high-pressure air or hot air entering together in the receiving chamber 8. The speed of the high-pressure air or hot air is further reduced and tends to be consistent with the moving speed of the material, finally forming a mixed material with a consistent moving speed.

[0039] Embodiment 5 of the present invention: A material conveying device for solid waste coupled combustion, comprising a high-pressure air inlet pipe 1, a high-pressure air nozzle 2, and a material receiving device 17. A material introduction device 18 is arranged on the material receiving device 17. The high-pressure air inlet pipe 1 is arranged on the material receiving device 17 and is located on one side of the material introduction device 18. The high-pressure air nozzle 2 is connected to the high-pressure air inlet pipe 1 and is arranged inside the material receiving device 17. The material receiving device 17 comprises a material inlet 11. The high-pressure air nozzle 2 is located on one side of the material inlet 11 and is located below the material inlet 11. The material receiving device 17 is connected to a mixing tube 10, and the mixing tube 10 is connected to a diffuser tube 12. The material introduction device 18 comprises an anti-bridging device 3, a lower hopper 4, and a material inlet storage bin 5. The anti-bridging device 3 is located above the material inlet 11 and is connected to the material inlet 11. The anti-bridging device 3 is arranged in the lower hopper 4. The material inlet storage bin 5 is located above the lower hopper 4 and is connected to the lower hopper 4. The lower hopper includes a straight section hopper 9 and a conical section hopper 7. The conical section hopper 7 is located above the straight section hopper 9 and connected to the conical section hopper 7. The anti-bridging device 3 is installed in the straight section hopper 9 of the lower hopper 4. The material receiving device 17 includes a receiving chamber 8 and a receiving chamber inlet 6. The receiving chamber inlet 6 is located below the material inlet 11. The receiving chamber inlet 6 is connected to the receiving chamber 8, and the receiving chamber 8 is connected to the mixing tube 10. The material enters the inner cavity of the material receiving device 17 from the material inlet 11 through the material introduction device 18. The high-pressure air or hot air is sprayed into the inner cavity of the material receiving device 17 from the high-pressure air nozzle 2. In the inner cavity of the material receiving device 17, the high-pressure air and hot air with a certain speed contact and mix with the material, and the material and the high-pressure air or hot air undergo momentum and energy conversion, and the speed of the high-pressure air or hot air decreases accordingly. The material moves along the flow direction of the high-pressure air or hot air, and the speed increases accordingly. The material is introduced into the receiving chamber 8 through the receiving chamber entrance 6, and is further fully mixed with the high-pressure air or hot air entering together in the receiving chamber 8. The speed of the high-pressure air or hot air is further reduced and tends to be consistent with the moving speed of the material, and finally a mixed material with a consistent moving speed is formed. Further, in order to prevent the material from being blocked, the anti-bridging device 3 includes a rotating motor 14, a rotating shaft 15 and a plurality of rotating blades 16. The plurality of rotating blades 16 are mounted on the rotating shaft 15, and one end of the rotating shaft 15 is connected to the rotating motor 14. The rotating shaft 15 is driven to rotate by the rotating motor 14, and the rotating blades 16 mounted on the rotating shaft 15 collide violently with the solid waste material and use the rotating blades to break the bridge of the blocked material, so that the material can smoothly enter the inner cavity of the material receiving device 17 from the material inlet 11.

[0040] Embodiment 6 of the present invention: A material conveying device for solid waste coupled combustion, comprising a high-pressure air inlet pipe 1, a high-pressure air nozzle 2, and a material receiving device 17. A material introduction device 18 is provided on the material receiving device 17. The high-pressure air inlet pipe 1 is provided on the material receiving device 17 and is located on one side of the material introduction device 18. The high-pressure air nozzle 2 is connected to the high-pressure air inlet pipe 1 and is provided inside the material receiving device 17. The material receiving device 17 comprises a material inlet 11. The high-pressure air nozzle 2 is located on one side of the material inlet 11 and is located below the material inlet 11. The material receiving device 17 is connected to a mixing tube 10, and the mixing tube 10 is connected to a diffuser tube 12. The material introduction device 18 comprises an anti-bridging device 3, a lower hopper 4, and a material inlet storage bin 5. The anti-bridging device 3 is located above the material inlet 11 and is connected to the material inlet 11. The anti-bridging device 3 is provided in the lower hopper 4. The material inlet storage bin 5 is located above the lower hopper 4 and is connected to the lower hopper 4. The lower hopper includes a straight section hopper 9 and a conical section hopper 7, the conical section hopper 7 is located above the straight section hopper 9, and the conical section hopper 7 is connected to the straight section hopper 9, and the anti-bridging device 3 is installed in the straight section hopper 9 of the lower hopper 4. Further, the material receiving device 17 includes a receiving chamber 8 and a receiving chamber inlet 6, the receiving chamber inlet 6 is located below the material inlet 11, the receiving chamber inlet 6 is connected to the receiving chamber 8, and the receiving chamber 8 is connected to the mixing tube 10. Further, the anti-bridging device 3 includes a rotating motor 14, a rotating shaft 15 and a plurality of rotating blades 16, the plurality of rotating blades 16 are installed on the rotating shaft 15, and one end of the rotating shaft 15 is connected to the rotating motor 14. The material enters the inner cavity of the material receiving device 17 from the material inlet 11 through the material introduction device 18, and the high-pressure air or hot air is sprayed into the inner cavity of the material receiving device 17 from the high-pressure air nozzle 2. In the inner cavity of the material receiving device 17, the high-pressure air and hot air with a certain speed contact and mix with the material, and the material and the high-pressure air or hot air undergo momentum and energy conversion, and the speed of the high-pressure air or hot air is reduced accordingly, and the material moves along the flow direction of the high-pressure air or hot air, and the speed increases accordingly. The material is introduced into the receiving chamber 8 through the receiving chamber entrance 6, and is further fully mixed with the high-pressure air or hot air entering together in the receiving chamber 8. The speed of the high-pressure air or hot air is further reduced and tends to be consistent with the moving speed of the material, and finally a mixed material with a consistent moving speed is formed. The rotating shaft 15 is driven to rotate by the rotating motor 14, and the rotating blades 16 installed on the rotating shaft 15 violently collide with the solid waste material and use the rotating blades to break the bridge of the blocked material, so that the material can smoothly enter the inner cavity of the material receiving device 17 from the material inlet 11. The distance between the center line of the rotating shaft 15 and the bottom edge of the conical barrel section hopper 7 is L, and the length of the distance L is less than or equal to D / 2, where D is the diameter of the straight barrel section hopper 9. In this example, the material conveying device for solid waste coupled combustion also includes a mixed material outlet 13, which is arranged at one end of the diffuser pipe 12.The high-pressure air nozzle 2 is a Laval nozzle.

[0041] The receiving chamber 8, the mixing tube 10 connected to the receiving chamber 8, and the diffuser 12 connected to the mixing tube 10 form a Laval nozzle shape. The cross-sectional area of ​​the diffuser is larger than the cross-sectional area of ​​the mixing tube, and the cross-sectional area of ​​the diffuser gradually increases along the material conveying direction, so the speed of the mixed material will gradually decrease and the pressure will gradually increase.

[0042] The working principle of the material conveying device for solid waste coupled combustion of the present invention is as follows:

[0043] Solid waste material enters from the conical barrel section hopper 7, and the anti-bridging device 3 set in the straight barrel section hopper 9 prevents the solid waste material from being blocked, so that the solid waste material can smoothly enter the inner cavity of the material receiving device 17 from the material inlet 11, and the high-pressure air or hot air is sprayed from the high-pressure air nozzle 2 into the inner cavity of the material receiving device 17. In the inner cavity of the material receiving device 17, the high-pressure air and hot air with a certain speed contact and mix with the material, and the material and the high-pressure air or hot air undergo momentum and energy conversion, and the speed of the high-pressure air or hot air is reduced accordingly, and the material moves in the flow direction of the high-pressure air or hot air, and the speed is increased accordingly. The material is guided to the receiving chamber 8 through the receiving chamber inlet 6, and is further fully mixed with the high-pressure air or hot air that enters together in the receiving chamber 8, and the speed of the high-pressure air or hot air is further reduced and tends to be consistent with the moving speed of the material, and finally a mixed material with a consistent moving speed is formed in the mixing chamber. In order to prevent the solid waste material from being blocked, the rotating shaft 15 is driven to rotate by the rotating motor 14 , and the continuously rotating rotating blades 16 are used to prevent the material from being blocked, so that the material can smoothly enter the inner cavity of the material receiving device 11 .

[0044] like Figure 4 As shown, the pressure is P P High-pressure air or hot air first enters the high-pressure air nozzle 2 from the high-pressure air inlet pipe 1; since the high-pressure air nozzle 2 is a Laval nozzle, the pressure of the high-pressure air or hot air is increased from P to P Reduce to the same pressure P as the solid waste material inlet h , the speed is greatly improved; at the same time, after the solid waste material passes through the anti-bridging device 3, the material undergoes high-speed turbulent motion around the high-pressure air nozzle 2; after the high-pressure air or hot air flows through the high-pressure air nozzle 2, the material sucked into the material receiving device 17 moves forward, and at the inlet 6 of the receiving chamber, the mixture of the material and the high-pressure air or hot air fills the entire cross-section.

[0045] As the distance between the gas-solid mixture and the outlet cross section of the high-pressure air nozzle 2 increases, the pressure of the high-pressure air or hot air at the outlet 21 of the receiving chamber decreases to P 2, a low pressure area is formed in the receiving chamber 8. At the same time, due to the high speed of high pressure air or hot air, a reflow area 20 is also formed in the receiving chamber 8. Due to the effect of the low pressure area, the material is ejected into the receiving chamber 8. Due to the effect of the reflow area 20, the high pressure air or hot air and the material are fully contacted to carry out strong energy and momentum conversion. Under the pressure difference and the high speed of high pressure air or hot air, the material enters the mixing tube 10. Violent mixing occurs in the mixing tube 10, energy and momentum exchange is carried out, and the velocity field gradually tends to be balanced, accompanied by an increase in pressure. At the outlet of the mixing tube 10, the speed of the mixed material is reduced due to the effect of entering the diffuser 12, and the pressure is further increased to Pc, and finally leaves the material conveying device at a suitable speed and pressure and enters the boiler furnace. Due to the existence of the reflow area 20 in the receiving chamber 8, the energy and momentum conversion between the high pressure air or hot air and the material is strengthened, the mixing distance is greatly shortened, the length of the entire material conveying device is shortened, and the equipment cost is reduced.

[0046] Due to the pressure P at the outlet 21 of the receiving chamber 2 Lower than the solid waste material inlet pressure P h Therefore, under the pressure difference and the entrainment of high-speed high-pressure air or hot air, the mixture enters the mixing tube 10, and the mixture is violently mixed in the mixing tube 10, and energy and momentum are exchanged. At this time, the speed of the material tends to be stable, accompanied by an increase in pressure. At the outlet 22 of the mixing tube, the pressure of the mixed material increases to P 3 , and finally leaves the material conveying equipment and enters the boiler furnace at a suitable speed and pressure.

[0047] At the outlet 21 of the mixing tube, the velocity of the mixed material gradually decreases due to the effect of entering the diffuser 12, and the pressure further increases to P c , the speed is further reduced, and finally a mixed material with the required appropriate speed and pressure is formed at the mixed material outlet 13.

[0048] Embodiment 7 of the present invention: A material conveying method, specifically comprising the following steps:

[0049] Step S01: high-pressure air or hot air is introduced into the high-pressure air inlet pipe, and the high-pressure air or hot air is sprayed into the inner cavity of the material receiving device through the high-pressure air nozzle, and the high-pressure air or hot air speed is increased and the pressure is reduced through the high-pressure air nozzle;

[0050] Step S02: allowing the crushed solid waste material to enter the material receiving device through the material introduction device;

[0051] Step S03: After the material is introduced into the material receiving device, the material enters the inner cavity of the material receiving device through the material inlet;

[0052] Step S04: In the inner cavity of the material receiving device (before entering the receiving chamber), the material performs high-speed turbulent motion around the high-pressure air nozzle; the material is fully contacted and mixed with the high-pressure air or hot air ejected by the high-pressure air nozzle and the energy and momentum are converted, the speed of the high-pressure air and hot air is reduced, and the material moves in the direction of the high-pressure air or hot air, and then the material is ejected into the receiving chamber, where the material continues to contact and mix with the high-pressure air or hot air and the energy and momentum are converted, and the moving speed of the material gradually increases;

[0053] Step S05: After step S04, the material enters the mixing tube, where the material is further fully mixed with the high-pressure air or hot air, so that the speed of the high-pressure air or hot air is reduced and tends to be consistent with the moving speed of the material, thereby forming a mixed material with a consistent moving speed;

[0054] Step S06: The mixed material enters the diffuser. As the cross section of the diffuser gradually increases, the speed of the mixed material gradually decreases and the pressure gradually increases, and a mixed material with a suitable speed and pressure is formed at the outlet of the diffuser. The speed and pressure of the formed mixed material vary depending on the equipment connected to the diffuser. Specifically, the speed of the mixed material formed at the outlet of the diffuser is 0-15 m / s and the pressure is 0-70 Kpa.

Claims

1. A material conveying device for solid waste coupled combustion, It is characterized in that The invention comprises a high-pressure air inlet pipe (1), a high-pressure air nozzle (2), and a material receiving device (17). The material receiving device (17) is provided with a material introduction device (18). The high-pressure air inlet pipe (1) is provided on the material receiving device (17) and is located on one side of the material introduction device (18). The high-pressure air nozzle (2) is connected to the high-pressure air inlet pipe (1) and is provided inside the material receiving device (17). The material receiving device (17) comprises a material inlet (11). The high-pressure air nozzle (2) is located on one side of the material inlet (11) and is located on the other side of the material introduction device (18). The material receiving device (17) is connected to the mixing tube (10) below the material inlet (11), and the mixing tube (10) is connected to the diffuser tube (12); the material introduction device (18) comprises an anti-bridging device (3), a lower hopper (4) and a material inlet storage bin (5); the anti-bridging device (3) is located above the material inlet (11) and is in communication with the material inlet (11); the anti-bridging device (3) is arranged in the lower hopper (4), and the material inlet storage bin (5) is located above the lower hopper (4) and is in communication with the lower hopper (4); the lower hopper comprises a straight cylinder The invention relates to a straight barrel section hopper (9) and a conical barrel section hopper (7), wherein the conical barrel section hopper (7) is located above the straight barrel section hopper (9), and the conical barrel section hopper (7) is connected to the straight barrel section hopper (9), and the anti-bridging device (3) is installed in the straight barrel section hopper (9) of the lower hopper (4); the anti-bridging device (3) comprises a rotating motor (14), a rotating shaft (15) and a plurality of rotating blades (16), wherein the plurality of rotating blades (16) are installed on the rotating shaft (15), and one end of the rotating shaft (15) is connected to the rotating motor (14); the center line of the rotating shaft (15) is aligned with the conical barrel section hopper (7). The distance between the bottom edges of the cylindrical hopper (7) is L, and the length of the distance L is less than or equal to D / 2, wherein D is the diameter of the straight cylindrical hopper (9); the material receiving device (17) comprises a receiving chamber (8) and a receiving chamber inlet (6), wherein the receiving chamber inlet (6) is located below the material inlet (11), the receiving chamber inlet (6) is connected to the receiving chamber (8), and the receiving chamber (8) is connected to the mixing tube (10); the receiving chamber (8), the mixing tube (10) connected to the receiving chamber (8), and the diffuser tube (12) connected to the mixing tube (10) form a Laval nozzle shape.

2. A material conveying device for solid waste coupled combustion according to claim 1, It is characterized in that It also comprises a mixed material outlet (13), wherein the mixed material outlet (13) is arranged at one end of the diffuser tube (12).

3. A material conveying device for solid waste coupled combustion according to claim 2, It is characterized in that The high-pressure air nozzle (2) is a Laval nozzle.

4. A material conveying method, It is characterized in that The method of conveying solid waste materials by using the material conveying device for solid waste coupled combustion as claimed in any one of claims 1 to 3 specifically comprises the following steps: Step S01: introducing high-pressure air or hot air into the high-pressure air inlet pipe, and spraying the high-pressure air or hot air into the inner cavity of the material receiving device through the high-pressure air nozzle; the high-pressure air or hot air speed is increased and the pressure is reduced through the high-pressure air nozzle; Step S02: allowing the crushed solid waste material to enter the material receiving device through the material introduction device; Step S03: After being introduced into the material receiving device, the material enters the inner cavity of the material receiving device through the material inlet; Step S04: In the inner cavity of the material receiving device, the material performs high-speed turbulent motion around the high-pressure air nozzle; the material is fully contacted and mixed with the high-pressure air or hot air ejected by the high-pressure air nozzle and the energy and momentum are converted, the speed of the high-pressure air and hot air is reduced, and the material moves in the direction of the high-pressure air or hot air, and then the material is ejected into the receiving chamber, where the material continues to contact and mix with the high-pressure air or hot air and the energy and momentum are converted, and the moving speed of the material gradually increases; Step S05: After step S04, the material enters the mixing tube, where the material is further fully mixed with the high-pressure air or hot air, so that the speed of the high-pressure air or hot air is reduced and tends to be consistent with the moving speed of the material, thereby forming a mixed material with a consistent moving speed; Step S06: The mixed material enters the diffuser. As the cross section of the diffuser gradually increases, the speed of the mixed material gradually decreases and the pressure gradually increases, forming a mixed material with a speed of 0-15 m / s and a pressure of 0-70 KPa at the outlet of the diffuser.

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