CN112880379A

CN112880379A - Municipal solid waste drying device

Info

Publication number: CN112880379A
Application number: CN202110284802.XA
Authority: CN
Inventors: 吕薇; 万馨瞳; 李雪松; 王乾; 梁禹淇; 王旭
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-06-01

Abstract

The invention relates to a drying device for municipal solid waste, which consists of a feed inlet, a throttling baffle, a heating cavity, an outer wall of a drying chamber, an inner wall of the drying chamber, a steam outlet, an arc-shaped guide plate, a filter and a liquid collecting box. Municipal solid waste enters the heating cavity from the feeding hole, is subjected to primary hot air drying in the heating cavity, enters the inner wall of the drying chamber under the pushing action of the screw feeder, and is subjected to secondary drying with hot air outside the inner wall of the drying chamber. The dried municipal solid waste falls into a collecting bucket. The upper part of the inner wall of the drying chamber is provided with a water vapor outlet, the dried water vapor is condensed and falls into the filter through the arc-shaped guide plate, and the filtered water of the municipal domestic waste finally flows into the liquid collecting tank. The invention can improve the drying effect, effectively reduce the water vapor discharged into the air, recover the moisture in the municipal solid waste and avoid the influence of the water vapor directly discharged into the air on the drying effect. The invention has certain prospect in future industry.

Description

Municipal solid waste drying device

Technical Field

The invention belongs to the field of drying of municipal solid waste, and particularly relates to a municipal solid waste drying device.

Background

The municipal solid waste has the advantages of sufficient source, high volatile content and the like, the incineration is an important mode for solving the harmless treatment of the municipal solid waste, and the municipal solid waste is subjected to procedures of screening, transporting, drying and the like before the incineration. Because the municipal solid waste contains a certain amount of water, and has higher water content than coal, partial heat can be consumed during incineration, so that the heat utilization rate of the municipal solid waste can be reduced, the incineration of a boiler can be influenced to a certain extent, the heat efficiency of the boiler is reduced, and the operation cost is increased, so that the municipal solid waste needs to be dried before incineration to improve the incineration efficiency of the municipal solid waste.

The common drying method is natural air drying, airing and stirring, which can only dry one layer of municipal solid waste on the surface, the inside of the municipal solid waste needs to be dried in a mode of repeatedly pouring materials, manpower and material resources are increased, the efficiency is low, the drying effect is poor, the environment is polluted, when the ventilation pipe is used for ventilating in a mode of penetrating into the materials, if the materials are moved, the pipe distribution needs to be carried out again, the resource waste is caused, water vapor is directly discharged into the air in the drying process, the air humidity is increased, the material humidity in contact with the air is increased, the drying effect is influenced, and the environment is polluted.

Disclosure of Invention

Aiming at the problems, the invention provides the municipal solid waste drying device, which improves the drying efficiency and realizes the recovery of water in the municipal solid waste drying process.

The invention provides an urban domestic garbage drying device which comprises a feeding hole, a throttling baffle, a heating cavity, an outer wall of a drying chamber, an inner wall of the drying chamber, a steam discharge port, an arc-shaped guide plate, a filter and a liquid collecting box, wherein the throttling baffle is arranged at the bottom of the feeding hole, a screw feeder is arranged in a space enclosed by the inner wall of the drying chamber, the arc-shaped guide plate is arranged at the upper part of the outer wall of the drying chamber, one end of the filter is connected with the arc-shaped guide plate, and the separation of steam and materials is realized.

Specifically, the throttling baffle is provided with an automatic falling spring, and when the material falls into the heating cavity, the throttling baffle automatically falls back to ensure that the amount of the material in the heating cavity is proper.

Specifically, three water vapor discharge ports are arranged on the upper part of the inner wall of the drying chamber, and the water vapor discharge ports penetrate through the upper part of the inner wall of the drying chamber and the upper part of the outer wall of the drying chamber.

The invention can improve the drying effect, effectively reduce the water vapor discharged into the air, recover the moisture in the process of drying the municipal solid waste and avoid the influence of the direct discharge of the water vapor into the air on the drying effect.

Drawings

The invention is further described below with reference to the accompanying drawings;

FIG. 1 is a front view of the municipal solid waste drying apparatus of the invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a diagrammatic representation of the feedwell of FIG. 1.

In fig. 1, 2, 3, 1 is a feed inlet; 2. a throttle baffle; 3. a heating cavity; 4. a primary air inlet; 5. a primary air outlet; 6. a screw feeder; 7. drying the outer wall of the chamber; 8. the inner wall of the drying chamber; 9. a secondary air inlet; 10. a secondary air outlet; 11. a collecting barrel; 12. a first water vapor outlet; 13. a second water vapor outlet; 14. a third water vapor outlet; 15. an arc-shaped guide plate; 16. a filter; 17. an overflow hose; 18. a liquid collecting tank.

Detailed Description

The invention provides a municipal solid waste drying device which has a specific structure shown in figures 1-3 and comprises a feed inlet 1, a throttling baffle 2, a heating cavity 3, a primary air inlet 4, a primary air outlet 5, a screw feeder 6, a drying chamber outer wall 7, a drying chamber inner wall 8, a secondary air inlet 9, a secondary air outlet 10, a material collecting barrel 11, a first water vapor discharge port 12, a second water vapor discharge port 13, a third water vapor discharge port 14, an arc-shaped guide plate 15, a filter 16, an overflow hose 17 and a liquid collecting tank 18.

The bottom of the feeding hole 1 is provided with the throttling baffle 2, the bottom of the heating cavity 3 is provided with a primary air inlet 4, and the side surface of one end of the heating cavity 3, which is far away from the drying cylinder, is provided with a primary air outlet 5; the outer wall 7 of the drying chamber is coaxially provided with the inner wall 8 of the drying chamber; the bottom of one end, far away from the feed port 1, of the drying chamber outer wall 7 is provided with a secondary air inlet 9, and the top, close to the feed port 1, of the drying chamber outer wall 7 is provided with a secondary air outlet 10; a secondary air channel is formed between the outer wall 7 of the drying chamber and the inner wall 8 of the drying chamber; the inner wall 8 of the drying chamber is enclosed to form a hollow material conveying space; the screw feeder 6 penetrates through the heating cavity 3; the top end of the outer wall 7 of the drying chamber is connected with the arc-shaped guide plate 15; a first water vapor outlet 12, a second water vapor outlet 13 and a third water vapor outlet 14 are reasonably arranged on the inner wall 8 of the drying chamber, and the first water vapor outlet 12, the second water vapor outlet 13 and the third water vapor outlet 14 penetrate through the upper part of the inner wall 8 of the drying chamber and the upper part of the outer wall 7 of the drying chamber; one end of the arc-shaped guide plate 15 is connected with the upper part of the outer wall 7 of the drying chamber, and the other end of the arc-shaped guide plate is connected with the filter 16; the liquid from the filter 16 enters the header tank 18 through an overflow hose 17.

The municipal solid waste is conveyed to the feeding hole 1 from the storage bin through the conveying belt, when the mass is small, due to the blocking effect of the throttling baffle 2 at the bottom of the feeding hole 1, the material is accumulated in the feeding hole 1, the throttling baffle 2 at the bottom of the feeding hole 1 is opened along with the increase of the amount of the poured material, the material falls into the heating cavity 3, and then the throttling baffle 3 is closed, so that the feeding amount is controlled; after the material enters the heating cavity 3, primary hot air is injected upwards from a primary air inlet 4, the heated material flows out from a primary air outlet 5, the screw feeder 6 drives the material heated by the primary air to enter a space enclosed by the inner wall 8 of the drying chamber, secondary air injected from a secondary hot air inlet 9 heats and dries the material in a heat conduction mode through the inner wall 8 of the drying chamber, the material flows out from a secondary air outlet 10, water vapor is discharged continuously in the advancing process of the material, and the water vapor is discharged out of the drying chamber through a water vapor discharge port I12, a water vapor discharge port II 13 and a water vapor discharge port III 14; the water vapor is condensed on the inner wall of the arc-shaped guide plate 15 through the first water vapor outlet 12, the second water vapor outlet 13 and the third water vapor outlet 14 and flows into the filter 16 along the arc-shaped guide plate 15, and the filtered liquid enters the liquid collecting tank 18 through the overflow hose 17.

The drying device for the municipal solid waste provided by the invention effectively improves the drying effect. And the moisture in the material is recycled, so that the phenomenon that the drying effect is influenced by directly discharging the water vapor into the air is avoided.

Claims

1. The arrangement method of the urban domestic garbage drying device is characterized in that an enlarged hexagonal feeding hole is arranged above a heating cavity, a throttling baffle is arranged below the feeding hole to ensure that the amount of materials in the heating cavity is proper, three water vapor discharging ports are formed in the upper portion of the inner wall of a drying chamber and penetrate through the upper portion of the inner wall of the drying chamber and the upper portion of the outer wall of the drying chamber, an arc-shaped guide plate is arranged on the upper portion of the outer wall of the drying chamber, one end of a filter is connected with the arc-shaped guide plate, the other end of the filter is connected with a liquid collecting box, separation and recovery of water vapor and the materials are achieved, and.

2. The dryer of claim 1, wherein the enlarged hexagonal feed opening is disposed above the heating chamber to provide more material than a conventional feed opening of the long barrel, and three steam discharge openings are disposed at an upper portion of an inner wall of the drying chamber to recover more moisture.