CN106746473A - For the dry belt drying system of sludge from wastewater treatment plant and drying means - Google Patents

Abstract

The invention relates to a belt-type drying system for sludge drying in urban sewage treatment plants, including a twisted cage conveying mechanism for stirring the sludge and transporting it from a low place to a high place, and a dispersion mechanism for evenly distributing the sludge output by the twisted cage conveying mechanism , the drying conveyor belt mechanism that conveys the sludge output by the dispersing mechanism, the collecting hopper at the end of the drying conveyor belt mechanism, and the drying room equipped with an exhaust device; In the drying room. It also relates to a belt drying method for sludge drying in urban sewage treatment plants. The invention improves the dry air utilization rate and drying efficiency, reduces the odor in the drying process, realizes the effects of low energy consumption and environmental protection, and belongs to the technical field of sludge drying.

Description

Belt drying system and drying method for sludge drying in urban sewage treatment plants

technical field

The invention relates to sludge drying technology, in particular to a belt drying system and drying method for sludge drying in urban sewage treatment plants.

Background technique

Sludge is a secondary product of sewage treatment. With the development of industry, the amount of sludge is increasing. Untreated sludge has the characteristics of large volume and high water content, which not only occupies a large amount of land, but also causes secondary pollution to soil and groundwater, so further treatment of sludge is required. In the disposal methods of sludge incineration, landfill, and resource utilization, there are certain requirements for the moisture content of sludge. The incineration treatment can only be carried out if the moisture content is below 50%, and the landfill standard can only be reached if the moisture content is below 60%. Mud drying is one of the key links to reduce its moisture content. The dried sludge has lower water content and smaller volume, which is convenient for transportation, storage and utilization.

At present, although the existing belt dryers on the market can achieve the effect of reducing the moisture content of sludge, they have disadvantages such as uneven feeding, low utilization rate of dry air, and low drying efficiency.

Contents of the invention

In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a belt drying system and drying method for drying sludge in urban sewage treatment plants with uniform distribution, high drying efficiency and low energy consumption.

In order to achieve the above object, the present invention adopts following technical scheme:

The belt drying system used for sludge drying in urban sewage treatment plants includes a twisted cage conveying mechanism that stirs the sludge and transports it from a low place to a high place, and a dispersion mechanism that evenly distributes the sludge output by the twisted cage conveying mechanism. The drying conveyor belt mechanism for conveying the sludge output by the mechanism, the collecting hopper at the end of the drying conveyor belt mechanism, and the drying room equipped with an exhaust device; the twisted cage conveying mechanism, the dispersion mechanism, the drying conveyor belt mechanism, and the collecting hopper are all located in the drying room .

As a preference, the drying conveyor belt mechanism includes multiple groups of drying conveyor belt units, each group of drying conveyor belt units includes a conveyor belt inclined to the horizontal direction, and the conveyor belts are parallel to each other and arranged in sequence from top to bottom in a vertical plane , the end of the upper conveyor belt is located above the first section of the adjacent lower conveyor belt; a space for air circulation is enclosed between the conveyor belts.

As a kind of preference, each group of drying conveyer belt unit all comprises a conveyer belt, two driving wheels, a plurality of supporting rollers, two baffles and the adjustable supporting frame of adjusting conveyer belt height position; At the end, the support roller is located between the two driving wheels, the conveyor belt is looped between the two driving wheels and supported by the support roller in the middle, and the baffles for installing the support roller are located on both sides of the conveyor belt.

As a preference, the uppermost conveyor belt is the first conveyor belt, the position of its head end is lower than that of the end, and its head end is located directly below the dispersing mechanism.

As a preference, the twisted cage conveying mechanism includes a motor reducer, a twisted cage conveyor, a twisted cage frame, a feed inlet, and a discharge port; the motor reducer is connected with the twisted cage conveyor to drive the twisted cage conveyor to run, and the twisted cage conveyor is The cage conveyor is installed in the drying room through the twisted cage frame; the feed inlet is located on the upper side of the lower end of the twisted cage conveyor, and the discharge port is located on the lower side of the upper end of the twisted cage conveyor.

As a preference, the dispersing mechanism includes a lower hopper, a disperser, and a distributor arranged sequentially from top to bottom, and the dispersing mechanism is installed in the drying room through the frame of the dispersing mechanism; extrusion components.

As a preference, the drying room is provided with an air inlet and an air outlet, the air inlet is located at the lower end of one side of the drying room, the air outlet is located at the upper end of the other side of the drying room, and the air outlet is equipped with a draft device.

As a preference, in a plan view direction, the conveyor belt and the cage conveying mechanism are arranged obliquely, and the intersection of the two is located at the dispersing mechanism.

The belt drying method used for sludge drying in urban sewage treatment plants adopts the belt drying system for sludge drying in urban sewage treatment plants. The mechanism presses the sludge into a cake shape, and the evenly distributed cake-shaped sludge is slowly transported to the collecting hopper by the drying conveyor belt mechanism and is air-dried at room temperature by convection.

As a preference, in the process of conveying the sludge by the drying conveyor belt mechanism, it passes through several conveyor belts arranged on the same vertical plane in turn, and the space for air circulation is formed between adjacent conveyor belts, which increases the local circulation of air , Improve sludge drying efficiency.

The principle of the present invention is: the sludge is lifted by the twisted cage conveying mechanism, compacted and evenly distributed by the dispersing mechanism, a long conveying path is provided by the drying conveyor belt mechanism, and it is dried in the drying chamber by low-temperature convection during the conveying process. , and finally collected by the collection hopper.

Generally speaking, the present invention has following advantages:

(1) Uniform distribution: The sludge to be dried passes through the dispersing mechanism, and after being extruded by the components, it is in the shape of a mud cake, and then sent to the conveyor belt through the distributor. The thickness of the sludge layer is uniform, achieving the effect of uniform distribution and increasing the drying time. Uniformity, improve sludge drying efficiency.

(2) Low energy consumption: Compared with the traditional belt-type high-temperature drying, low-temperature drying greatly reduces energy consumption and meets the requirements of energy saving and emission reduction. The vertical distribution of multi-layer conveyor belts is adopted to increase the local circulation of air and improve Air utilization efficiency enhances its drying effect.

(3) Environmental protection: Under the traditional high-temperature drying operation, sludge will produce a large amount of odor, which seriously affects the environment. If the odor is not collected and treated, it will cause secondary pollution; if it is treated, it will increase the operating cost. In the low-temperature drying process of sludge, the amount of odor generated is small, which avoids the impact of odor on the environment.

(4) The conveyor belt is vertically arranged. On the one hand, it can save space while ensuring a long conveying route. On the other hand, the sludge is naturally dropped and transported between layers, which is equivalent to turning the material, which is conducive to sludge drying. Increased air circulation between conveyor belts improves drying efficiency.

Description of drawings

Figure 1 is a schematic diagram of a belt drying system for sludge drying in urban sewage treatment plants.

Fig. 2 is a top view of the twisted cage conveying mechanism, the dispersing mechanism, and the drying conveyor belt mechanism.

Fig. 3 is a structural schematic diagram of the support roller.

Among them, 1 is the air inlet, 2 is the feed port, 3 is the motor reducer, 4 is the twisted cage conveyor, 5-1 is the twisted cage frame, 5-2 is the dispersion mechanism frame, 6 is the discharge port, 7 is the lower hopper, 8 is the disperser, 9 is the extruding member, 10 is the distributor, 11 is the driving wheel, 12 is the first section of the conveyor belt, 13 is the second section of the conveyor belt, 14 is the third section of the conveyor belt, 15 is the collector Hopper, 16 is an air outlet, 17 is a baffle plate, 18 is a support roller, 19 is an adjustable support frame, 20 is a roller shaft, and 21 is a bayonet pin. α is the angle between the conveyor belt and the twisted cage conveying mechanism in the top view direction, and β is the inclination angle of the conveyor belt.

detailed description

The present invention will be described in further detail below.

The belt drying system used for sludge drying in urban sewage treatment plants includes a twisted cage conveying mechanism that stirs the sludge and transports it from a low place to a high place, and a dispersion mechanism that evenly distributes the sludge output by the twisted cage conveying mechanism. The drying conveyor belt mechanism for conveying the sludge output by the mechanism, the collecting hopper at the end of the drying conveyor belt mechanism, and the drying room equipped with an exhaust device; the twisted cage conveying mechanism, the dispersion mechanism, the drying conveyor belt mechanism, and the collecting hopper are all located in the drying room . In the direction of looking down, the conveyor belt and the twisted cage conveying mechanism are arranged obliquely, the inclination angle is α, and the intersection point of the two is located in the dispersion mechanism.

The drying room is provided with an air inlet and an air outlet, the air inlet is located at the lower end of one side of the drying room, the air outlet is located at the upper end of the other side of the drying room, and the air outlet is equipped with an exhaust device. The exhaust device of this embodiment is an exhaust fan.

The twisted cage conveying mechanism includes a motor reducer, a twisted cage conveyor, a twisted cage frame, a material inlet, and a material outlet. The motor reducer is connected with the twisted cage conveyor through a shaft to drive the twisted cage conveyor to run. The twisted cage conveyor is installed in the drying room through the twisted cage frame, and the twisted cage frame is set at 1/3 and 2/3 of the twisted cage conveyor as the support body of the twisted cage conveyor. The feed inlet is located on the upper side of the lower starting end of the twisted cage conveyor, the discharge outlet is located on the lower side of the upper end of the twisted cage conveyor, and the discharging direction is downward. The twisted cage conveyor is an existing equipment, and its function is to transport the sludge from a low place to a high place, and to agitate the sludge in a spiral and mix it evenly.

The dispersing mechanism includes a lower hopper, a disperser, and a distributor arranged in sequence from top to bottom. The dispersing mechanism is installed in the drying room through the dispersing mechanism frame; the dispersing device is equipped with an extruding member that squeezes the sludge into a cake shape. The lower hopper is arranged directly below the discharge port of the twisted cage conveyor to catch the discharge of the twisted cage conveyor. The extruding member in this embodiment is a pair of extruding rollers, and the distributor is a tapered bucket with a narrower opening at the lower end.

The drying conveyor mechanism consists of three sets of drying conveyor units. Each group of dry conveyor belt units includes a conveyor belt, two driving wheels, multiple supporting rollers, two baffles and an adjustable support frame for adjusting the height of the conveyor belt; the driving wheels are located at the head and end of the conveyor belt, and multiple supports The rollers are located between the two driving wheels parallel to each other and arranged side by side. The conveyor belt is looped between the two driving wheels and supported by the support rollers in the middle. The baffles for installing the support rollers are located on both sides of the conveyor belt. The three conveyor belts are parallel to each other (the inclination angle is β) and are arranged sequentially from top to bottom in a vertical plane. The end of the second section of the conveyor belt is located directly above the head end of the third section of the conveyor belt. In the vertical direction, a multi-layer staggered and evenly distributed conveyor belt system is formed); the space between the conveyor belts is surrounded by air circulation. The top conveyor belt is the first conveyor belt, its head end is lower than the end, and its head end is directly below the distributor. The conveyor belt is driven by the driving wheel to run slowly.

The working process is as follows: the sludge to be dried is sent into the twisted cage conveyor from the feed port, driven by the motor reducer, the twisted cage conveyor transports the sludge obliquely upward along the body from the bottom, and the sludge is The twisted cage conveyor is screw-stirred, mixed evenly, sent to the lower hopper of the dispersing mechanism through the discharge port, and enters the extruding member of the disperser along the lower hopper. After being processed by the extruding member, the sludge to be dried is Cake shape, the sludge is evenly sent to the conveyor belt by the distributor at the lower end of the disperser. The sludge is conveyed from the first section of conveyor belt to the second section of conveyor belt, and then to the third section of conveyor belt. Dry air enters from the air inlet, driven by the exhaust device to move upward slowly, and finally discharged from the air outlet. The sludge is exchanged with dry air on the conveyor belt. When the sludge is transferred to the end of the third conveyor belt, it will automatically slide down into the collecting hopper. The conveyor belts are vertically arranged, and the air circulation space is enclosed between adjacent conveyor belts, which increases the local circulation of the air and improves the sludge drying efficiency.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (10)

1. the dry belt drying system of sludge from wastewater treatment plant is used for, it is characterised in that：Including

- the cage conveying mechanism of eminence is delivered to by sludge agitation and from lower,

- equally distributed the decentralized institution of sludge for exporting cage conveying mechanism,

The drier conveyer mechanism of-sludge transmission for exporting decentralized institution,

- positioned at the aggregate bin of drier conveyer mechanism end,

- the drying room equipped with extractor fan；

Cage conveying mechanism, decentralized institution, drier conveyer mechanism, aggregate bin are respectively positioned in drying room.

2. according to described in claim 1 for the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that： Drier conveyer mechanism includes multigroup drier conveyer unit, and every group of drier conveyer unit inclines including one with horizontal direction Oblique conveyer belt, each conveyer belt is parallel to each other and is arranged in order from top to bottom in a perpendicular, the end of upper conveyor End is positioned at the first section top of adjacent downside conveyer belt；The space of air circulation is surrounded between conveyer belt.

3. according to described in claim 2 for the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that： Every group of drier conveyer unit includes a conveyer belt, two driving wheels, multiple support disk rollers, two pieces of baffle plates and adjustment transmission Adjustable supporter with high and low position；Driving wheel is located at head end and the end of conveyer belt, support disk roller be located at two driving wheels it Between, conveyer belt is circularized and is wrapped between two driving wheels and centre is supported by support disk roller, the gear for installing support disk roller Plate is located at the both sides of conveyer belt.

4. according to described in claim 2 for the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that： Conveyer belt positioned at the top is first paragraph conveyer belt, and the position of its head end is less than the position of end, and its first section is located at divides Dissipate the underface of mechanism.

5. according to described in claim 1 for the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that： Cage conveying mechanism includes motor reducer, cage conveyer, cage frame, charging aperture, discharging opening；Motor reducer and cage Conveyer connects and drives the operation of cage conveyer, and cage conveyer is arranged in drying room by cage frame；Charging aperture is located at The lower end upside of cage conveyer, discharging opening is located at the upper end downside of cage conveyer.

6. according to described in claim 1 for the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that： Decentralized institution includes the hopper, disperser, the distributing device that set gradually from top to bottom, and decentralized institution is pacified by decentralized institution frame In drying room；The extruded member that sludge is squeezed into pie is provided with disperser.

7. according to described in claim 1 for the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that： Drying room is provided with air inlet and air outlet, and air inlet is located at the lower end of the side of drying room, and air outlet is located at the another of drying room The upper end of side, air outlet is equipped with extractor fan.

8. according to described in claim 2 for the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that： In overlook direction, conveyer belt is obliquely installed with cage conveying mechanism, and both intersection points are located at decentralized institution.

9. the dry belt drying method of sludge from wastewater treatment plant is used for, using any one of claim 1 to 8 For the dry belt drying system of sludge from wastewater treatment plant, it is characterised in that：Sludge is by cage conveying mechanism from lower Hoist and be delivered to decentralized institution, sludge is pressed into pie by decentralized institution, and equally distributed pie sludge is by drier conveyer machine Structure is air-dried during being slowly delivered to aggregate bin by normal temperature convection current.

10. according to, for the dry belt drying method of sludge from wastewater treatment plant, its feature exists described in claim 9 In：During sludge is conveyed by drier conveyer mechanism, a plurality of conveyer belt being arranged on same vertical plane, phase are sequentially passed through The space of air circulation is surrounded between adjacent conveyer belt, the local circulation of air is increased, drying sludge efficiency is improved.