Energy-saving noise-reducing solid waste pneumatic conveying device

Abstract

The utility model discloses an energy-saving noise-reduction solid waste pneumatic conveying device which comprises a spiral conveyor (1) which feeds 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] This utility model relates to a conveying device, and more particularly to an energy-saving and noise-reducing pneumatic conveying device for solid waste. Background Technology

[0002] Solid waste refers to solid and muddy substances discarded by humans in production and daily life activities. It includes solid particles separated from wastewater and exhaust gases. All solid or semi-solid substances generated by human activities that no longer have any use value to their owners and are therefore discarded are collectively referred to as solid waste. Solid waste generated from various production activities is commonly known as waste residue; solid waste generated from daily life activities is called garbage.

[0003] Currently, solid waste is generally transported to waste incineration plants for incineration. Solid waste is fed into the boiler furnace by a Roots blower with high air pressure and low flow rate, in conjunction with a Venturi ejector. It has been found that this method of transportation is not only noisy but also energy-intensive. Utility Model Content

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

[0005] The technical solution of this utility model is: an energy-saving and noise-reducing solid waste pneumatic conveying device, including a screw conveyor that feeds material downwards at an inclined angle. The lower outlet of the screw conveyor is connected to a three-way transition interface. The other two interfaces of the transition interface are horizontally arranged and connected to the conveying air duct. A feed hopper is provided on the upper side of the screw conveyor. A belt elevator that feeds material to the feed hopper is provided on one side of the upper end of the feed hopper. The screw conveyor includes a self-sealing section located on the lower side and a screw conveying section located on the upper side of the self-sealing section. A centrifugal fan that supplies air to the conveying air duct is provided at one end of the conveying air duct.

[0006] In the aforementioned energy-saving and noise-reducing solid waste pneumatic conveying device, 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 bladeless 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 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 duct is 20 degrees.

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

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

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] This application uses a screw conveyor in conjunction with a conveying duct to feed materials, thereby reducing the required air pressure. A centrifugal blower can be used to replace the Roots blower, reducing energy consumption and noise. Since the reduced air pressure may cause the boiler to backfire into the air duct, this application sets a self-sealing section in the screw conveyor to prevent the conveying air from flowing back, thus ensuring good safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model.

[0015] The labels in the attached diagram are: 1-Screw conveyor, 2-Transition interface, 3-Feed hopper, 4-Belt elevator, 5-Conveying duct, 6-Auger blade, 7-Bladeless segment, 8-Centrifugal fan. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0017] Example. An energy-saving and noise-reducing pneumatic conveying device for solid waste, configured as follows: Figure 1-2 As shown, the device includes a screw conveyor 1 that feeds material downwards at an inclined angle. A three-way transition interface 2 is connected to the lower outlet of the screw conveyor 1. The other two interfaces of the transition interface 2 are horizontally arranged and connected to the conveying air duct 5. A feed hopper 3 is provided on the upper side of the screw conveyor 1. A belt elevator 4 that feeds material 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 screw conveying section located on the upper side of the self-sealing section. A centrifugal fan 8 that supplies air to the conveying air duct 5 is provided at one end of the conveying air duct 5.

[0018] The screw conveyor 1 has a screw conveying section consisting of auger blades 6 arranged along the axial direction of the screw conveyor 1, and a self-sealing section consisting of a bladeless segment 7 formed by cutting off the auger blades 6 at the lower end of the screw conveyor 1.

[0019] The angle between the material conveying direction in the screw conveyor 1 and the gas conveying direction in the conveying duct 5 is an acute angle.

[0020] The angle between the material conveying direction in the screw conveyor 1 and the gas conveying direction in the conveying duct 5 is 20 degrees.

[0021] The screw conveyor 1 has an outer diameter of 325mm, and the total length of the self-sealing section and the screw conveying section of the screw conveyor 1 is 2000mm, of which the length of the self-sealing section is 180-250mm.

[0022] The length of the self-sealing section is 180mm.

[0023] The working principle of this application is an improvement on existing solid waste pneumatic conveying devices. Previously, our company used a Roots blower in conjunction with a Venturi ejector to convey solid waste. Because the Venturi ejector requires a large air pressure, the Roots blower had high energy consumption. This application uses a centrifugal blower as the power source for the movement of solid waste in the conveying duct 5, and works in conjunction with a screw conveyor 1 to convey the solid waste. The required air pressure is relatively smaller than that of the Venturi ejector, which can reduce energy consumption and noise. For example, the previous application used a three-lobe Roots blower with a motor power of 280kW; now it uses a centrifugal blower with a motor power of 132kW. However, during use, it was found that the reduced air pressure easily leads to backflow of the conveying air, posing a significant safety hazard. Therefore, this application incorporates a self-sealing section in the screw conveyor 1 to seal the end of the screw conveyor and prevent backflow of the conveying air from causing safety hazards. The self-sealing section of this application is achieved by cutting off the auger blades at the middle end of the screw conveyor. In this way, 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, causing the solid waste at the front to be compacted, thus achieving self-sealing. The self-sealing effect is affected by the blade cutting length; the longer the blade cutting length, the better the self-sealing effect, but it also increases the resistance of the first rotating shaft 9 and the self-sealing section, increasing the resistance to solid waste material conveying and leading to a decrease in conveying efficiency. If the self-sealing section is too long, it is prone to breakage of the first rotating shaft 9 and the self-sealing section, posing a significant safety hazard and requiring more time for equipment maintenance and replacement, affecting work efficiency. Conversely, if the self-sealing section is too short, it is prone to failure to achieve self-sealing due to the influence of backflow conveying air. The following is a table showing the correspondence between the self-sealing section length and conveying efficiency in this application.

[0024] Table 1. Relationship between the length of the self-sealing section and the solid waste conveying efficiency.

[0025]

[0026] When the length of the self-sealing section is less than 180mm, self-sealing cannot be formed, resulting in poor reliability. When the length of the self-sealing section is greater than 250mm, the solid waste fuel at the end of the auger blades 6 will exert a large reaction force on the auger blades when transporting solid waste fuel, causing the auger blades to break, resulting in poor safety. As shown in the table above, the solid waste transport efficiency is the highest when the length of the self-sealing section is set to 180mm.

[0027] Solid waste is fed uniformly by screw conveyor 1 and mixed with air by transition interface 2. Transition interface 2 includes a horizontally set air inlet, a feed inlet with an acute angle to the air inlet, and a horizontally set discharge outlet. The cross-sectional area of ​​the discharge outlet is larger than that of the air inlet and the feed inlet, thus playing a transition role.

Claims

1. An energy-saving and noise-reducing pneumatic conveying device for solid waste, characterized in that: The screw conveyor (1) is inclined downward to feed material. The screw conveyor (1) is connected to a three-way transition interface (2) at the lower outlet. The other two interfaces of the transition interface (2) are horizontally set and connected to the conveying air duct (5). The upper end of the screw conveyor (1) is provided with a feed hopper (3). The upper side of the feed hopper (3) is provided with a belt elevator (4) that feeds material to the feed hopper (3). The screw conveyor (1) includes a self-sealing section located on the lower side and a screw conveying section located on the upper side of the self-sealing section. One end of the conveying air duct (5) is provided with a centrifugal fan (8) that blows air into the conveying air duct (5).

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

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

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

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