Waste heat preheating energy-saving device and waste heat preheating energy-saving system for hazardous waste

Abstract

The utility model discloses a waste heat preheating energy-saving device and a waste heat preheating energy-saving system for hazardous waste, and belongs to the technical field of hazardous waste treatment. The shell is horizontally arranged relatively, the spiral conveyor is used for drying the granular solid hazardous waste, the shell is arranged on the spiral conveyor in a sleeving mode to form an annular gap, and a feeding port and a discharging port which are far away from the shell are formed in the two ends of the spiral conveyor; the waste heat heating assembly comprises a heat conduction pipe and heat conduction filler, combustion waste gas can be introduced into the heat conduction pipe, the heat conduction pipe is arranged in the annular gap and spirally arranged around the spiral conveyor, and heat conduction wrinkles arranged in the radial direction of the heat conduction pipe are arranged on the heat conduction pipe; the annular gap is filled with the heat conduction filler so that heat exchange between the heat conduction pipe and the spiral conveyor can be promoted. According to the waste heat recovery device, waste heat of combustion waste gas of granular solid hazardous waste can be fully utilized, the waste heat recovery efficiency of the combustion waste gas is improved, and moisture in the granular solid waste is effectively removed.

Description

Technical Field

[0001] The utility model relates to the technical field of hazardous waste treatment, in particular to a waste heat preheating energy saver and a waste heat preheating energy saving system for hazardous waste. Background Art

[0002] Particulate solid hazardous waste is generated during the chemical process, which is usually treated by high-temperature harmless incineration. During the high-temperature treatment process, the hazardous waste often has a certain moisture content and the temperature is uneven, resulting in the incineration temperature being lower than the set temperature, and the overall combustion efficiency is low, causing a large amount of dioxin gas generated during the incineration process to not be completely burned, causing secondary pollution to the environment.

[0003] Therefore, a preheating device will be installed before hazardous waste enters the incinerator. The current preheating device does not fully utilize waste heat energy, has low heat exchange efficiency, bulky equipment, weak thermal insulation performance, serious heat loss, low thermal energy utilization rate, and is difficult to effectively remove moisture from granular solid waste. Utility Model Content

[0004] In view of this, it is necessary to provide a waste heat preheating energy saver and a waste heat preheating energy saving system for hazardous waste to solve the problem that the existing preheating device has low utilization rate of waste heat and is difficult to effectively remove moisture from granular solid waste.

[0005] In a first aspect, the utility model provides a waste heat preheating economizer for hazardous waste, comprising:

[0006] The housing is relatively horizontally arranged;

[0007] The screw conveyor is used for drying granular solid hazardous waste. The outer shell is sleeved on the screw conveyor to form an annular gap. Both ends of the screw conveyor are provided with a feed port and a discharge port which are arranged away from the outer shell.

[0008] A waste heat heating component, the waste heat heating component includes a heat-conducting pipe and a heat-conducting filler that can pass combustion exhaust gas. The heat-conducting pipe is arranged in the annular gap and spirally arranged around the screw conveyor. The heat-conducting pipe is provided with heat-conducting folds arranged along the radial direction of the heat-conducting pipe; the heat-conducting filler is filled in the annular gap to promote heat exchange between the heat-conducting pipe and the screw conveyor.

[0009] Furthermore, at least two of the heat-conducting pipes are arranged in an axial array along the shell, and an adjacent heat-conducting pipe can fill the axial gap of another spirally arranged heat-conducting pipe.

[0010] Furthermore, the heat-conducting pipe includes a pipe body, and a plurality of the heat-conducting folds are equidistantly arranged around the central axis of the pipe body, and the heat-conducting folds are relatively embedded in the pipe body. One side of the heat-conducting folds and the inner wall of the pipe body form a first heat-conducting cavity for contacting the combustion exhaust gas, and the other side of the heat-conducting folds forms a second heat-conducting cavity filled with a heat-conducting filler. The heat-conducting folds can increase the contact area between the combustion exhaust gas and the heat-conducting filler.

[0011] Furthermore, the heat-conducting folds are rectangular, trapezoidal or triangular.

[0012] Furthermore, the outer wall of the screw conveyor is provided with a plurality of heat-conducting fins, the plurality of heat-conducting fins are equidistantly arranged around the central axis of the screw conveyor and fixedly connected to the screw conveyor, and the heat-conducting fins are inserted into the heat-conducting filler.

[0013] Furthermore, the thermally conductive filler is a metal oxide filler.

[0014] Furthermore, an air inlet and an air outlet are respectively provided at both ends of the heat conducting pipe, and the air inlet and the air outlet are connected to the outside through the end of the shell.

[0015] Furthermore, the inner wall of the shell is provided with a heat-insulating layer.

[0016] In a second aspect, the utility model provides a waste heat preheating energy-saving system, comprising at least two waste heat preheating energy-saving devices for hazardous waste, wherein the discharge port of one of the screw conveyors is connected to the feed port of another of the screw conveyors.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model discloses a waste heat preheating energy saver for hazardous waste, which is provided with a waste heat heating component, which includes a heat conducting pipe and a heat conducting filler. The waste gas generated after the combustion of granular solid hazardous waste can be introduced into the heat conducting pipe to recover the waste heat in the waste gas. The outer shell and the screw conveyor form an annular gap, and the heat conducting pipe is arranged in the annular gap and spirally arranged around the screw conveyor. The spirally arranged heat conducting pipe can extend the length in the annular gap, and the heat exchange area between the heat conducting pipe and the hazardous waste is increased, thereby improving the heat energy transfer efficiency. The heat conducting pipe is provided with heat conducting folds arranged along the radial direction of the heat conducting pipe, and the heat conducting folds increase the surface area of ​​the heat conducting pipe, thereby further improving the efficiency of heat transfer, so that more heat energy can be transferred to the screw conveyor and the hazardous waste. The heat conducting filler is filled in the annular gap, and the heat conducting filler has excellent heat conduction capacity, which can promote the heat exchange between the heat conducting pipe and the screw conveyor, and can improve the waste heat recovery efficiency of the combustion exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of a waste heat preheating energy-saving system provided by the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of a waste heat preheating energy saver for hazardous waste in the utility model. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the structure of a waste heat preheating energy saver for hazardous waste in the utility model. Figure 2 ;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the heat conducting pipe in the utility model;

[0024] Figure 5 It is a cross-sectional schematic diagram of the heat conducting pipe in the utility model;

[0025] Figure 6 It is a structural schematic diagram of the screw conveyor in the utility model.

[0026] In the figure, 100, outer shell; 110, thermal insulation layer;

[0027] 200, screw conveyor; 210, feed port; 220, discharge port; 230, heat transfer fin;

[0028] 300, waste heat heating component; 310, heat conducting pipe; 311, heat conducting folds; 312, tube body; 313, air inlet; 314, air outlet; 320, heat conducting filler. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0030] A waste heat preheating energy saver for hazardous waste in the present embodiment relates to the technical field of hazardous waste treatment. A waste heat heating component 300 is arranged on the periphery of a screw conveyor 200. A heat pipe 310 provided with heat conductive folds 311 is used to introduce combustion waste gas into the heat pipe 310. A heat conductive filler 320 can transfer heat from the heat pipe 310 to the screw conveyor 200, thereby drying the granular solid hazardous waste in the screw conveyor 200, making full use of the waste heat of the combustion waste gas of the granular solid hazardous waste, and reducing the pollution of the granular solid hazardous waste.

[0031] See also Figures 1 to 6 In this embodiment, a waste heat preheating energy saver for hazardous waste includes a housing 100, a screw conveyor 200, and a waste heat heating component 300. The screw conveyor 200 can convey granular solid hazardous waste, dry the granular solid hazardous waste, reduce the moisture in the granular solid hazardous waste, and prevent the granular solid hazardous waste from burning and producing dioxin gas. The housing 100 is sleeved on the screw conveyor 200, and the housing 100 is relatively horizontally arranged. The housing 100 is sleeved on the screw conveyor 200. The granular solid hazardous waste can fully contact the screw conveyor 200 under the action of gravity, which is conducive to the transfer of heat. The two ends of the screw conveyor 200 are provided with a feed port 210 and a discharge port 220 that are arranged away from the housing 100. The granular solid hazardous waste can be input from the feed port 210 and output from the discharge port 220 to complete the drying of the granular solid hazardous waste.

[0032] The waste heat heating assembly 300 includes a heat pipe 310 and a heat conductive filler 320. The waste gas generated by the combustion of granular solid hazardous waste can be passed into the heat pipe 310 to recover the waste heat in the waste gas. The housing 100 and the screw conveyor 200 form an annular gap. The heat pipe 310 is arranged in the annular gap and spirally arranged around the screw conveyor 200. The spirally arranged heat pipe 310 can extend the length located in the annular gap, and the heat exchange area between the heat pipe 310 and the hazardous waste is increased, thereby improving the efficiency of heat energy transfer. The heat pipe 310 is provided with heat conductive folds 311 arranged along the radial direction of the heat pipe 310. The heat conductive folds 311 increase the surface area of ​​the heat pipe 310, thereby further improving the efficiency of heat transfer, so that more heat energy can be transferred to the screw conveyor 200 and the hazardous waste. The heat conductive filler 320 is filled in the annular gap. The heat conductive filler 320 has excellent heat conduction capability, can promote heat exchange between the heat conductive pipe 310 and the screw conveyor 200, and can improve the waste heat recovery efficiency of the combustion exhaust gas.

[0033] In some embodiments, see Figure 4 At least two heat-conducting pipes 310 are arranged in an axial array along the shell 100, and there is an axial gap in the heat-conducting pipe 310 with a spiral arrangement. Different heat-conducting pipes 310 are arranged in an axial array, and an adjacent heat-conducting pipe 310 can fill the axial gap of another spirally arranged heat-conducting pipe 310, so that the heat-conducting pipe 310 as a whole presents a relatively closed cylindrical shape. By increasing the number of heat-conducting pipes 310 and arranging them in an axial array, the overall heat exchange area of ​​the heat-conducting pipe 310 is increased, the heat energy transfer efficiency is improved, the heat exchange between the heat-conducting pipe 310 and the screw conveyor 200 is promoted, and the waste heat recovery efficiency of the combustion exhaust gas can be improved.

[0034] Adjacent heat pipes 310 can fill the axial gap of another spirally arranged heat pipe 310, which can reduce the space for heat dissipation, so that the heat can be concentrated in the annular gap for transfer, avoiding the waste of heat energy and improving the utilization rate of heat energy.

[0035] The axial array arrangement of the multiple heat pipes 310 allows the heat to be more evenly distributed in the annular gap, reduces the phenomenon of local overheating or overcooling, and allows the granular solid hazardous waste to be heated more evenly.

[0036] The provision of at least two heat pipes 310 increases the redundancy of the system. Even if one of the heat pipes 310 fails, the other heat pipe 310 can still continue to transfer heat, ensuring the continuous operation of the system and improving the stability and reliability of the overall system.

[0037] In some embodiments, see Figure 5 The heat-conducting pipe 310 includes a pipe body 312, and a plurality of heat-conducting folds 311 are equidistantly arranged around the central axis of the pipe body 312. The heat-conducting folds 311 are relatively embedded in the pipe body 312. One side of the heat-conducting folds 311 and the inner wall of the pipe body 312 form a first heat-conducting cavity for contacting the combustion exhaust gas. The arrangement of the heat-conducting folds 311 and the first heat-conducting cavity can increase the contact area between the combustion exhaust gas and the heat-conducting pipe 310 body, thereby improving the efficiency of heat transfer from the combustion exhaust gas to the heat-conducting pipe 310.

[0038] A second heat-conducting cavity filled with heat-conducting filler 320 is formed on the other side of the heat-conducting corrugation 311. The second heat-conducting cavity formed by the heat-conducting corrugation 311 is fully filled with heat-conducting filler 320, which can reduce heat loss to the outside, ensure that the heat is concentrated inside the preheating device, and improve the thermal insulation performance of the overall system.

[0039] In some embodiments, please refer to Figure 5 The heat-conducting corrugations 311 are rectangular, trapezoidal or triangular. The rectangular, trapezoidal or triangular corrugations can significantly increase the surface area of ​​the heat-conducting pipe 310. Compared with a simple smooth pipe body 312, more surfaces can be provided for contact with the combustion exhaust gas and the heat-conducting filler 320, thereby improving the efficiency of heat transfer.

[0040] The three geometric shapes of the folds form a complex structure on the surface of the tube body 312, which can disturb the flow of the combustion exhaust gas and increase the turbulence effect, thereby improving the convective heat transfer efficiency. Turbulence helps to improve the heat conduction between the gas and the tube wall.

[0041] In some embodiments, see Figure 6The outer wall of the screw conveyor 200 is provided with a plurality of heat-conducting fins 230, which are equidistantly arranged around the central axis of the screw conveyor 200 and fixedly connected to the screw conveyor 200, and the heat-conducting fins 230 are inserted into the heat-conducting filler 320. The presence of the heat-conducting fins 230 can enhance the heat exchange between the outer wall of the screw conveyor 200 and the filler, ensuring that the hazardous waste can be preheated and dried faster during the transportation process.

[0042] The heat-conducting fins 230 increase the contact area between the screw conveyor 200 and the heat-conducting filler 320 , so that more heat can be transferred from the heat-conducting filler 320 to the screw conveyor 200 , thereby improving the overall heat transfer efficiency.

[0043] The heat-conducting fins 230 are equidistantly arranged along the central axis of the screw conveyor 200, and can evenly transfer heat to various parts of the screw conveyor 200, avoiding the problem of local temperature being too high or too low, so that the hazardous waste is heated more evenly during the transmission process.

[0044] In some embodiments, the heat conductive filler 320 is a metal oxide filler, and the metal oxide filler, such as aluminum oxide (Al2O3), magnesium oxide (MgO), etc., has a high thermal conductivity. Compared with non-metallic materials, metal oxides can transfer heat more effectively and improve the overall heat exchange efficiency of the preheating device. Metal oxides have good thermal conductivity and can quickly transfer heat from the heat pipe 310 to the screw conveyor 200 and the hazardous waste, thereby improving the preheating and drying effects.

[0045] In some embodiments, see Figure 1 and Figure 2 An air inlet 313 and an air outlet 314 are respectively provided at both ends of the heat pipe 310. The high-temperature exhaust gas generated by the combustion of granular solid hazardous waste is input from the air inlet 313, spirally moves in the heat pipe 310, transfers the heat to the heat pipe 310, and is output from the air outlet 314, thereby completing the recovery and reuse of heat in the high-temperature exhaust gas.

[0046] In some embodiments, see Figure 3 The inner wall of the housing 100 is provided with a heat-insulating layer 110 , which can prevent heat from being transferred from the heat-conducting filler 320 to the outside, causing heat loss and reducing the utilization efficiency of waste heat.

[0047] The present embodiment provides a waste heat preheating energy-saving system, comprising at least two waste heat preheating energy-saving devices for the above-mentioned hazardous waste. The discharge port 220 of one screw conveyor 200 is connected to the feed port 210 of another screw conveyor 200. The granular solid hazardous waste can circulate in multiple screw conveyors 200, thereby achieving thorough drying of the granular solid hazardous waste and avoiding residual moisture.

[0048] Workflow: First, the waste gas generated by the combustion of granular solid hazardous waste is passed into the heat-conducting pipe 310, and the heat-conducting pipe 310 heats the heat-conducting filler 320. Then, the screw conveyor 200 is started to make the screw conveyor 200 rotate relatively. Next, the granular solid hazardous waste to be dried is put into the feed port 210 of the screw conveyor 200, and the granular solid hazardous waste circulates in the screw conveyor 200 and is dried and heated.

[0049] The above description is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered by the present invention.

Claims

1. A waste heat preheating economizer for hazardous waste, characterized in that: include: The housing is relatively horizontally arranged; The screw conveyor is used for drying granular solid hazardous waste. The outer shell is sleeved on the screw conveyor to form an annular gap. Both ends of the screw conveyor are provided with a feed port and a discharge port which are arranged away from the outer shell. A waste heat heating component, the waste heat heating component includes a heat-conducting pipe and a heat-conducting filler that can pass combustion exhaust gas. The heat-conducting pipe is arranged in the annular gap and spirally arranged around the screw conveyor. The heat-conducting pipe is provided with heat-conducting folds arranged along the radial direction of the heat-conducting pipe; the heat-conducting filler is filled in the annular gap to promote heat exchange between the heat-conducting pipe and the screw conveyor.

2. The waste heat preheating economizer for hazardous waste according to claim 1, characterized in that: At least two of the heat-conducting pipes are arranged in an axial array along the shell, and an adjacent heat-conducting pipe can fill the axial gap of another spirally arranged heat-conducting pipe.

3. The waste heat preheating economizer for hazardous waste according to claim 2, characterized in that: The heat-conducting pipe includes a pipe body, and a plurality of heat-conducting folds are equidistantly arranged around the central axis of the pipe body. The heat-conducting folds are relatively embedded in the pipe body. One side of the heat-conducting folds and the inner wall of the pipe body form a first heat-conducting cavity for contacting the combustion exhaust gas, and the other side of the heat-conducting folds forms a second heat-conducting cavity filled with a heat-conducting filler. The heat-conducting folds can increase the contact area between the combustion exhaust gas and the heat-conducting filler.

4. The waste heat preheating economizer for hazardous waste according to claim 3, characterized in that: The heat-conducting corrugations are rectangular, trapezoidal or triangular.

5. The waste heat preheating economizer for hazardous waste according to claim 1, characterized in that: The outer wall of the screw conveyor is provided with a plurality of heat-conducting fins, which are equidistantly arranged around the central axis of the screw conveyor and fixedly connected to the screw conveyor, and the heat-conducting fins are inserted into the heat-conducting filler.

6. The waste heat preheating economizer for hazardous waste according to claim 1, characterized in that: The thermally conductive filler is a metal oxide filler.

7. The waste heat preheating economizer for hazardous waste according to claim 1, characterized in that: An air inlet and an air outlet are respectively arranged at two ends of the heat conducting pipe, and the air inlet and the air outlet are communicated with the outside through the end of the shell.

8. The waste heat preheating economizer for hazardous waste according to claim 1, characterized in that: The inner wall of the shell is provided with a heat-insulating layer.

9. A waste heat preheating energy-saving system, characterized in that: It comprises at least two waste heat preheating economizers for hazardous waste as described in any one of claims 1 to 8, wherein the discharge port of one of the screw conveyors is connected to the feed port of another of the screw conveyors.

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