Energy-saving and noise-reducing solid waste pneumatic conveying device and conveying process

Abstract

The energy-saving and noise-reducing solid waste pneumatic conveying device comprises a spiral conveyor (1) which conveys materials obliquely downwards, a three-way type transition connector (2) is connected to an outlet in the lower side of the spiral conveyor (1), the other two connectors of the transition connector (2) are horizontally arranged and connected with a conveying air pipe (5), and a feeding hopper (3) is arranged on the upper side of the upper end of the spiral conveyor (1). One side of the upper end of the feeding hopper (3) is provided with a belt elevator (4) for supplying materials to the feeding hopper (3), the spiral conveyer (1) comprises a self-sealing section located on the lower side and a spiral conveying section arranged on the upper side of the self-sealing section, and one end of the conveying air pipe (5) is provided with a centrifugal fan (8) for supplying air to the conveying air pipe (5). The device has the advantages of low energy consumption and low noise.

Description

Technical Field

[0001] The invention relates to a conveying device and a conveying process, in particular to an energy-saving and noise-reducing solid waste pneumatic conveying device and a conveying process. Background Art

[0002] Solid waste refers to the solid and muddy substances discarded by humans in production and life activities. It includes solid particles separated from wastewater and waste gas. All solid or semi-solid substances generated by all human activities and discarded because they no longer have use value to the owner are generally called solid waste. Solid waste generated in various production activities is commonly known as waste residue; solid waste generated in life activities is called garbage.

[0003] At present, solid waste is generally transported to waste incineration plants for incineration. The solid waste is sent to the boiler furnace for incineration through a high-pressure, low-flow Roots blower as the power source of solid waste fuel, combined with a Venturi ejector device. It is now found that this form of transportation is not only noisy, but also energy-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide an energy-saving and noise-reducing solid waste pneumatic conveying device and conveying process, which has the advantages of low energy consumption and low noise.

[0005] The technical solution of the present invention is: an energy-saving and noise-reducing pneumatic conveying device for solid waste, comprising a screw conveyor that feeds materials downward at an angle, a three-way transition interface being connected at the lower outlet of the screw conveyor, the other two interfaces of the transition interface being arranged horizontally and connected to a conveying air duct, a feed hopper being arranged on the upper side of the upper end of the screw conveyor, a belt elevator for supplying materials to the feed hopper being arranged on one side of the upper end of the feed hopper, the screw conveyor comprising a self-sealing section located on the lower side and a spiral conveying section arranged on the upper side of the self-sealing section, and a centrifugal fan for supplying air to the conveying air duct being arranged at one end of the conveying air duct.

[0006] In the aforementioned energy-saving and noise-reducing pneumatic conveying device for solid waste, the screw conveying section of the screw conveyor is an auger blade arranged along the axial direction of the screw conveyor, and the self-sealing section is a leafless segment formed by cutting off the auger blade at the lower end of the screw conveyor.

[0007] In the aforementioned energy-saving and noise-reducing solid waste pneumatic conveying device, the angle between the material conveying direction in the screw conveyor and the gas conveying direction in the conveying air duct is an acute angle.

[0008] In the aforementioned energy-saving and noise-reducing solid waste pneumatic conveying device, the angle between the material conveying direction in the screw conveyor and the gas conveying direction in the conveying air duct is 20 degrees.

[0009] In the aforementioned energy-saving and noise-reducing pneumatic conveying device for solid waste, the screw conveyor has an outer diameter of 325 mm, and the total length of the self-sealing section of the screw conveyor and the screw conveying section is 2000 mm, of which the length of the self-sealing section is 180-250 mm.

[0010] In the aforementioned energy-saving and noise-reducing solid waste pneumatic conveying device, the length of the self-sealing section is 180 mm.

[0011] A conveying process, using the aforementioned energy-saving and noise-reducing solid waste pneumatic conveying device, adopts the following steps:

[0012] S1, feeding materials to the feed hopper of the screw conveyor through a belt conveyor;

[0013] S2. Start the centrifugal fan and the screw conveyor at the same time. The solid waste fuel enters the screw conveyor from the feed hopper. The screw conveyor drives the solid waste fuel to move through the screw conveying section. The solid waste fuel will accumulate in the self-sealing section. The solid waste fuel in the self-sealing section is driven by the solid waste fuel in the rear spiral conveying section to fall into the transition interface and move along the conveying air duct under the action of the centrifugal fan, and finally the solid waste fuel is transported to the boiler.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] The present application uses a screw conveyor in conjunction with a conveying air duct to deliver materials, thereby reducing the required wind pressure. A centrifugal fan can be used to replace a Roots blower to reduce energy consumption and reduce noise. Since the wind pressure is reduced and there is a situation where the boiler backfires into the air duct, the present application sets a self-sealing section in the screw conveyor to prevent the conveying air from backflowing, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the present invention.

[0018] The markings in the attached drawings are: 1-screw conveyor, 2-transition interface, 3-feed hopper, 4-belt elevator, 5-conveying air duct, 6-auger blade, 7-bladeless segment, 8-centrifugal fan. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0020] Embodiment. A pneumatic conveying device for solid waste with energy saving and noise reduction, comprising: Figure 1-2As shown, it includes a screw conveyor 1 that feeds materials obliquely downward, and the lower outlet of the screw conveyor 1 is connected to a three-way transition interface 2, and the other two interfaces of the transition interface 2 are horizontally arranged and connected to a conveying air duct 5. A feed hopper 3 is provided on the upper side of the upper end of the screw conveyor 1, and a belt elevator 4 for feeding materials to the feed hopper 3 is provided on one side of the upper end of the feed hopper 3. The screw conveyor 1 includes a self-sealing section located on the lower side and a spiral conveying section arranged on the upper side of the self-sealing section, and a centrifugal fan 8 for supplying air to the conveying air duct 5 is provided at one end of the conveying air duct 5.

[0021] The screw conveying section of the screw conveyor 1 is an auger blade 6 arranged along the axial direction of the screw conveyor 1 , and the self-sealing section is a bladeless segment 7 formed by cutting off the auger blade 6 at the lower end of the screw conveyor 1 .

[0022] The angle between the material conveying direction in the screw conveyor 1 and the gas conveying direction in the conveying air duct 5 is an acute angle.

[0023] The angle between the material conveying direction in the screw conveyor 1 and the gas conveying direction in the conveying air duct 5 is 20 degrees.

[0024] The outer diameter of the screw conveyor 1 is 325 mm, and the total length of the self-sealing section and the screw conveying section of the screw conveyor 1 is 2000 mm, wherein the length of the self-sealing section is 180-250 mm.

[0025] The length of the self-sealing section is 180 mm.

[0026] A conveying process, using the aforementioned energy-saving and noise-reducing solid waste pneumatic conveying device, adopts the following steps:

[0027] S1, feeding materials to the feed hopper 3 of the screw conveyor 1 through the belt conveyor 4;

[0028] S2. Start the centrifugal fan 8 and the screw conveyor 1 at the same time. The solid waste fuel enters the screw conveyor 1 from the feed hopper 3. The screw conveyor 1 drives the solid waste fuel to move through the screw conveying section. The solid waste fuel will accumulate in the self-sealing section. The solid waste fuel in the self-sealing section is driven by the solid waste fuel in the rear spiral conveying section to fall into the transition interface 2, and moves along the conveying air duct 5 under the action of the centrifugal fan 8, and finally transports the solid waste fuel to the boiler.

[0029] The working principle of this application is an improvement on the existing pneumatic conveying device for solid waste. Our company previously used Roots blowers in conjunction with Venturi ejectors to transport solid waste. Because the Venturi ejector needs to provide a large wind pressure, the Roots blower has a high energy consumption. This application uses a centrifugal blower as the power source for the movement of solid waste in the conveying air duct 5, and cooperates with a screw conveyor 1 to transport the solid waste. The required wind pressure is relatively small relative to the Venturi ejector, which can reduce energy consumption and reduce noise. For example, a three-blade Roots blower with a motor power of 280kW was previously used, and now a centrifugal exhaust fan with a motor power of 132kW is used. However, it was found during use that due to the reduction in wind pressure, it is easy to cause the conveying wind to return, which poses a great safety hazard. Therefore, this application sets a self-sealing section in the screw conveyor 1 to seal the end of the screw conveyor to prevent the conveying wind from returning and causing safety hazards. The self-sealing section of the present application is realized by cutting off the auger blades at the middle end of the screw conveyor, so that the material in the self-sealing section is not driven by the blades and can only move forward under the push of the solid waste at the rear side, resulting in the solid waste at the front end being compacted to achieve self-sealing. The effect of self-sealing is affected by the cutting length of the blades. The longer the cutting length of the blades, the better the self-sealing effect. However, at the same time, the resistance to the first rotating shaft 9 and the self-sealing section will increase, which will increase the resistance to the transportation of solid waste materials and reduce the transportation efficiency. If the self-sealing section is too long, it is easy to cause the first rotating shaft 9 and the self-sealing section to break, which poses a great safety hazard, and it takes a lot of time to repair and replace the equipment, affecting work efficiency. If the self-sealing section is set too short, it is easy to fail to achieve self-sealing under the influence of the backflow conveying wind. The following is a corresponding table of the setting length of the self-sealing section of the present application and the conveying efficiency.

[0030] Table 1 Relationship between the length of the self-sealing section and the transportation efficiency of solid waste materials

[0031]

[0032] When the length of the self-sealing section is less than 180mm, self-sealing cannot be formed and the reliability is poor; when the length of the self-sealing section is greater than 250mm, when the auger blade 6 is transporting solid waste fuel, the solid waste fuel at the end will produce a large reaction force on the auger blade, causing the auger blade to break, resulting in poor safety. As shown in the table above, when the length of the self-sealing section is set to 180mm, the solid waste transportation efficiency is the highest.

[0033] The solid waste is evenly fed through the screw conveyor 1, and the solid waste is mixed with wind through the transition interface 2. The transition interface 2 includes a horizontally arranged air inlet, a feed port with an acute angle with the air inlet, and a horizontally arranged discharge port. The cross-sectional area of ​​the discharge port is larger than the cross-sectional areas of the air inlet and the feed port, thereby playing a transition role.

Claims

1. An energy-saving and noise-reducing solid waste pneumatic conveying device, characterized in that: The invention comprises a screw conveyor (1) for feeding materials obliquely downward, wherein the outlet on the lower side of the screw conveyor (1) is connected to a three-way transition interface (2), the other two interfaces of the transition interface (2) are arranged horizontally and connected to a conveying air duct (5), a feed hopper (3) is arranged on the upper side of the upper end of the screw conveyor (1), a belt elevator (4) for feeding materials to the feed hopper (3) is arranged on one side of the upper end of the feed hopper (3), the screw conveyor (1) comprises a self-sealing section located on the lower side and a screw conveying section arranged on the upper side of the self-sealing section, and a centrifugal fan (8) for supplying air to the conveying air duct (5) is arranged at one end of the conveying air duct (5).

2. The energy-saving and noise-reducing solid waste pneumatic conveying device according to claim 1 is characterized by: The screw conveying section of the screw conveyor (1) is an auger blade (6) arranged along the axial direction of the screw conveyor (1), and the self-sealing section is a bladeless segment (7) formed by cutting off the auger blade (6) at the lower end of the screw conveyor (1).

3. The energy-saving and noise-reducing solid waste pneumatic conveying device according to claim 1 is characterized in that: The angle between the material conveying direction in the screw conveyor (1) and the gas conveying direction in the conveying air duct (5) is an acute angle.

4. The energy-saving and noise-reducing solid waste pneumatic conveying device according to claim 1 is characterized in that: The angle between the material conveying direction in the screw conveyor (1) and the gas conveying direction in the conveying air duct (5) is 20 degrees.

5. The energy-saving and noise-reducing solid waste pneumatic conveying device according to claim 1 is characterized in that: The outer diameter of the screw conveyor (1) is 325 mm. The total length of the self-sealing section and the screw conveying section of the screw conveyor (1) is 2000 mm, wherein the length of the self-sealing section is 180-250 mm.

6. The energy-saving and noise-reducing solid waste pneumatic conveying device according to claim 5 is characterized by: The length of the self-sealing section is 180 mm.

7. A conveying process, characterized in that: Using the energy-saving and noise-reducing solid waste pneumatic conveying device according to claims 1-6, the following steps are adopted: S1, feeding materials to the feed hopper (3) of the screw conveyor (1) through the belt conveyor (4); S2. The centrifugal fan (8) and the screw conveyor (1) are started simultaneously, and the solid waste fuel enters the screw conveyor (1) from the feed hopper (3). The screw conveyor (1) drives the solid waste fuel to move through the screw conveying section. The solid waste fuel will accumulate in the self-sealing section. The solid waste fuel in the self-sealing section is driven by the solid waste fuel in the rear side screw conveying section to fall into the transition interface (2), and moves along the conveying air duct (5) under the action of the centrifugal fan (8), and finally the solid waste fuel is transported to the boiler.

Images