Sludge vacuum dewatering device based on heat recycling

Abstract

The utility model discloses a sludge vacuum dewatering device based on heat recycling. The sludge vacuum dewatering device comprises a feeding unit, a vacuum dewatering unit and a condensation heat exchange unit, the vacuum dehydration unit comprises a vacuum tank, a vacuum generation device and a heat exchange assembly; the condensation heat exchange unit comprises a condensation tank; the heat exchange assembly comprises a plurality of heat exchange pumps, a condensation heat exchange assembly and a stirring heat exchange assembly in the vacuum tank. The utility model provides a vacuum sludge drying technical scheme, the boiling point of water can be reduced in a vacuum state, and then moisture in the sludge is evaporated through a heat source, so that the drying reduction of the sludge is realized, generated waste gas and water vapor are subjected to centralized treatment after heat exchange, the heat source can be from waste gas heat exchange in the treatment process, and the heat source can be recycled. And the heat energy utilization rate of the whole equipment can be effectively improved. The whole equipment is high in integration level, no odor leaks in the treatment process, and the adaptability of equipment deployment can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection equipment, in particular to a sludge vacuum dehydration device based on heat recovery utilization. Background Art

[0002] In the harmless treatment of sludge, sludge dehydration is an important process. Dehydration can significantly reduce the moisture content of sludge, reduce the volume and weight of sludge, facilitate subsequent treatment and disposal, and reduce the impact on the environment. Dehydrated sludge is usually more suitable for landfill, incineration, composting and other treatment methods.

[0003] Commonly used sludge treatment methods include belt dewatering devices and plate and frame dewatering devices. Belt dewatering devices and plate and frame dewatering equipment occupy a large overall area and are open in shape. The waste gas generated during the treatment process is generally discharged directly into the air, which has a great impact on surrounding residents. Utility Model Content

[0004] The utility model aims to provide a sludge vacuum dehydration device based on heat recovery to solve the problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a sludge vacuum dehydration device based on heat recovery, including a feeding unit, a vacuum dehydration unit, and a condensation heat exchange unit; the feeding unit includes a conveyor belt and a filter bucket arranged at the starting end of the conveyor belt; the vacuum dehydration unit includes a vacuum tank, a vacuum generating device, and a heat exchange component; the condensation heat exchange unit includes a condensation tank, the condensation tank includes an air inlet, an air outlet, and a water outlet, and the vacuum tank air outlet is connected to the condensation tank air inlet; the heat exchange component includes a plurality of heat exchange pumps and a condensation heat exchange component; the condensation heat exchange component includes a heat exchange pipe arranged in the condensation tank.

[0006] Preferably, the vacuum tank comprises a double-layer tank body, a gap is arranged between the two layers of the tank body, and the outer tank body is provided with a heat medium inlet and outlet; the condensing heat exchange component also includes a stirring heat exchange component inside the vacuum tank, and the stirring heat exchange component inside the vacuum tank includes a stirring heat exchange shaft, stirring heat exchange blades arranged in an array on the heat exchange shaft, and a motor that drives the heat exchange shaft to rotate, and the stirring heat exchange shaft and the stirring heat exchange blades are hollow structures with interconnected cavities, and are filled with heat exchange medium.

[0007] Preferably, the stirring heat exchange blade includes a blade body and a welded ring plate. The blade body is an internally hollow annular structure with a central angle of 30-120 degrees and an inclined surface on its edge. The welded ring plate is arranged at the opening of the blade body close to the center of the circle, and a groove or opening is arranged at the place where the internal cavity of the blade body is connected. The central angle and width of the welded ring plate are larger than those of the blade body.

[0008] Preferably, there are two stirring heat exchange shafts, and the stirring heat exchange blades of the two stirring heat exchange shafts are staggered along the axial direction.

[0009] Preferably, the stirring heat exchange blades adjacent to the two stirring heat exchange shafts are in different positions in the initial state and the moving state, and the angle between the axial symmetry lines of the stirring heat exchange blades is 45-135 degrees.

[0010] Preferably, a horizontal baffle is provided in the middle and lower part of the inner cavity of the vacuum tank, and the distance between the horizontal baffle and the lowest end of the stirring heat exchange blade is 5-50 cm. The horizontal baffle 1 and the inner wall and side wall of the vacuum tank below enclose a closed space.

[0011] Preferably, the horizontal baffle is provided with a scraper blade group arranged in an array, including supporting uprights and scraper blades, and the scraper blades are in contact with the stirring and heat exchange blades.

[0012] The utility model provides a vacuum sludge drying technology solution, which uses the fact that the boiling point of water will be lowered under vacuum state, and then evaporates the water in the sludge through the heat source, thereby achieving the drying and reduction of the sludge, and the generated waste gas and water vapor are centrally processed after heat exchange. During the processing, the heat source can come from the waste gas heat exchange, or from the waste heat of other equipment around the equipment, which can effectively improve the thermal energy utilization rate of the overall equipment. The overall equipment has a high degree of integration, no odor leakage during the processing process, and can improve the adaptability of equipment deployment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall solution of the utility model.

[0014] Figure 2 It is a partial cutaway schematic diagram of the vacuum dehydration unit of the utility model.

[0015] Figure 3 It is a schematic diagram of the stirring heat exchange blade of the utility model.

[0016] Figure 4 It is a partial cutaway schematic diagram of a vacuum dehydration unit of another embodiment of the utility model.

[0017] Figure 5 It is a partial cutaway schematic diagram of a vacuum dehydration unit of another embodiment of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] As attached Figure 1-5 As shown, a sludge vacuum dehydration device based on heat recovery and utilization involved in the utility model comprises a feeding unit 1, a vacuum dehydration unit 2, and a condensation heat exchange unit 3.

[0020] The feeding unit 1 is used to add the sludge to be treated into the vacuum tank 21 of the vacuum dehydration unit 2, and can be a conveyor belt. Figure 1 The middle loading unit 1 comprises a conveyor belt 11 and a filter bucket 12 arranged at the starting end of the conveyor belt 11 .

[0021] The vacuum dehydration unit 2 includes a vacuum tank 21 , a vacuum generating device 22 , and a heat exchange component 23 . The condensation heat exchange unit 3 includes a condensation tank 31 .

[0022] The condensation tank 31 includes an air inlet 311, an air outlet 312, and a water outlet 313. The water vapor and waste gas generated after treatment by the vacuum dehydration unit 2 enter the condensation tank 31 through the air inlet 311, and the waste gas formed after condensation treatment flows into the subsequent treatment process through the air outlet 312 and the waste water through the water outlet 313.

[0023] The vacuum generating device 22 is a commercially available vacuum device.

[0024] The vacuum tank 21 comprises a double-layer tank body, a gap is arranged between the two layers of the tank body, and the outer layer of the tank body is provided with a heat medium inlet and outlet, so that the tank body of the vacuum tank 21 is heated by the flow of the heat medium.

[0025] The heat exchange component 23 includes a plurality of heat exchange pumps 231 , a condensation heat exchange component 232 , and a stirring heat exchange component 233 in a vacuum tank.

[0026] The condensing heat exchange component 232 includes a heat exchange pipe arranged in the condensing tank 31, and a pipe connected to other heat sources, such as waste heat sources of peripheral equipment. The high-temperature heat medium flows into the stirring heat exchange component 233 in the vacuum tank and the gap between the double-layer tank body of the vacuum tank through the heat exchange pump 231, and circulates through the heat exchange pump 231.

[0027] The stirring heat exchange component 233 in the vacuum tank includes a stirring heat exchange shaft 2331, stirring heat exchange blades 2332 arranged in an array on the heat exchange shaft 2331, and a motor 2333 that drives the heat exchange shaft 2331 to rotate. The stirring heat exchange shaft 2331 and the stirring heat exchange blades 2332 are hollow structures filled with heat exchange medium. The stirring heat exchange blades 2332 include a semicircular ring shape, which is a hollow cavity structure inside. The center is welded and fixed to the stirring heat exchange shaft 2331. A through hole or through groove is set on the side wall of the stirring heat exchange shaft 2331 at the junction of the stirring heat exchange shaft 2331 and the stirring heat exchange blades 2332.

[0028] Attached Figure 2 Two stirring heat exchange shafts 2331 are arranged in the middle, and the stirring heat exchange blades 2332 of the two stirring heat exchange shafts 2331 are staggered along the axial direction.

[0029] The semicircular ring structure of the stirring heat exchange blades 2332 can prevent the sludge from staying between the stirring heat exchange blades 2332 during the stirring process.

[0030] Furthermore, the stirring heat exchange blades 2332 adjacent to the two stirring heat exchange shafts 2331 are in different positions in the initial state and the moving state, and the angle between the axial symmetry lines of the stirring heat exchange blades 2332 is 90 degrees, or 45-135 degrees.

[0031] Furthermore, the central angle of the stirring and heat exchange blades 2332 may also be 30-120 degrees.

[0032] As attached Figure 3 As shown, the stirring heat exchange blade 2332 includes a blade body a1 and a welding ring plate a1. The blade body a1 is a hollow circular ring structure, and the central angle of the circle can also be 30-120 degrees, and its edge is provided with an inclined surface. The welding ring plate a1 is arranged at the opening of the blade body a1 close to the center of the circle, and a slot or opening is arranged at the connection of the internal cavity of the blade body a1. The central angle and width of the welding ring plate a1 (along the axial direction of the stirring heat exchange shaft 2331) are greater than the blade body a1. The setting of the welding ring plate a1 can improve the firmness of the welding, and at the same time improve the positioning accuracy of the blade body a1 during the welding process.

[0033] The stirring heat exchange blades 2332 may be perpendicular to the side of the stirring heat exchange shaft 2331 , or may be arranged at a certain inclination angle to the side of the stirring heat exchange shaft 2331 .

[0034] The sludge is squeezed and cut by the adjacent stirring and heat exchange blades 2332, and is heated by the internal heat medium during the process.

[0035] Furthermore, as attached Figure 4As shown, a horizontal baffle 211 is provided in the middle and lower part of the inner cavity of the vacuum tank 21, and the horizontal baffle 211 is 5-50 cm away from the lowest end of the stirring heat exchange blade 2332. The horizontal baffle 211 can reduce the sludge staying at the lowest point of the vacuum tank 21. The horizontal baffle 211 and the inner wall of the vacuum tank 21 below and the side wall of the vacuum tank 21 form a closed space, which can be filled with heat medium. An electric heating plate can also be provided on the horizontal baffle 211.

[0036] An array of scraper blades b is arranged on the horizontal baffle 211 or the side wall of the vacuum tank 21, which is used to scrape the sludge on the stirring heat exchange blades. The scraper blades b include a support rod b1 and a scraper blade b2, and the scraper blade b2 is in contact with the stirring heat exchange blades 2332. The scraper blades b include a support rod b1 and a scraper blade b2 made of elastic material, which can be a plastic material with elasticity. At least one raised strip a3 is arranged on each side of the blade body a1. During the rotation process, the raised strip a3 can push the support rod b1 and the scraper blade b2, and the support rod b1 and the scraper blade b2 will jump, which is helpful to remove the sludge on the blades.

[0037] Furthermore, as attached Figure 5 As shown, in order to regulate the flow of heat medium in the stirring heat exchange shaft 2331 and the stirring heat exchange blade 2332, a central partition c1 is provided in the stirring heat exchange shaft 2331. The central partition c divides the interior of the stirring heat exchange shaft 2331 into cavities. Each of the separated cavities is provided with an opening or slot connected to the interior of the stirring heat exchange blade 2332. The two cavities in the figure are of the same size or may be of different sizes. On one side of one of the cavities, a sealing plate c2 is provided at the end where the heat medium flows into. Both sides of the stirring heat exchange shaft 2331 extend out of the side of the vacuum tank and are connected to the heat exchange tube through a common commercially available rotary connection structure.

[0038] It should be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

Claims

1. A sludge vacuum dehydration device based on heat recovery, characterized in that: It includes a feeding unit, a vacuum dehydration unit, and a condensation heat exchange unit; the feeding unit includes a conveyor belt and a filter bucket arranged at the starting end of the conveyor belt; the vacuum dehydration unit includes a vacuum tank, a vacuum generating device, and a heat exchange component; the condensation heat exchange unit includes a condensation tank, and the condensation tank includes an air inlet, an air outlet, and a water outlet, and the air outlet of the vacuum tank is connected to the air inlet of the condensation tank; the heat exchange component includes a plurality of heat exchange pumps and a condensation heat exchange component; the condensation heat exchange component includes a heat exchange pipe arranged in the condensation tank.

2. A sludge vacuum dehydration device based on heat recovery according to claim 1, characterized in that: The vacuum tank comprises a double-layer tank body, a gap is arranged between the two layers of the tank body, and the outer tank body is provided with a heat medium inlet and outlet; the condensing heat exchange component also comprises a stirring heat exchange component inside the vacuum tank, and the stirring heat exchange component inside the vacuum tank comprises a stirring heat exchange shaft, stirring heat exchange blades arranged in an array on the heat exchange shaft, and a motor driving the heat exchange shaft to rotate, and the stirring heat exchange shaft and the stirring heat exchange blades are hollow structures with interconnected cavities, and are filled with heat exchange medium.

3. A sludge vacuum dehydration device based on heat recovery according to claim 2, characterized in that: The stirring heat exchange blade includes a blade body and a welded ring plate. The blade body is an internally hollow annular structure with a central angle of 30-120 degrees and an inclined surface on its edge. The welded ring plate is arranged at the opening of the blade body close to the center of the circle, and a groove or opening is arranged at the place where the internal cavity of the blade body is connected. The central angle and width of the welded ring plate are larger than those of the blade body.

4. A sludge vacuum dehydration device based on heat recovery according to claim 3, characterized in that: There are two stirring heat exchange shafts, and the stirring heat exchange blades of the two stirring heat exchange shafts are staggered along the axial direction.

5. A sludge vacuum dehydration device based on heat recovery according to claim 4, characterized in that: The stirring heat exchange blades adjacent to the two stirring heat exchange shafts are at different positions in the initial state and the moving state, and the angle between the axial symmetry lines of the stirring heat exchange blades is 45-135 degrees.

6. A sludge vacuum dehydration device based on heat recovery according to claim 5, characterized in that: A horizontal baffle is arranged in the middle and lower part of the inner cavity of the vacuum tank. The horizontal baffle is 5-50 cm away from the lowest end of the stirring heat exchange blade. The horizontal baffle and the inner wall and side wall of the vacuum tank below form a closed space.

7. A sludge vacuum dehydration device based on heat recovery according to claim 6, characterized in that: The horizontal baffle is provided with a scraper plate group arranged in an array, including a supporting vertical rod and a scraper plate, and the scraper plate is in contact with the stirring heat exchange blade.

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