Furnace waste heat utilization device

Abstract

The utility model provides a furnace waste heat utilization device, which relates to the technical field of industrial equipment, and comprises a plurality of main flues arranged at equal intervals along the vertical direction, the plurality of main flues are communicated end to end in sequence, the upper wall of any main flue is provided with a plurality of radiating tubes which are distributed at intervals and are communicated with the heat transfer space at the upper part of the main flue, and the radiating tubes are communicated with the heat transfer space at the lower part of the main flue. A heat insulation cover used for sealing the heat transfer space between the corresponding main flues sleeves the outer side between any two adjacent main flues, a fluid outlet and a fluid inlet are formed in the two ends, located at the diagonal line of the heat transfer space, of the heat insulation cover correspondingly, and the fluid inlet located in the lower layer communicates with the fluid outlet located in the upper layer between the adjacent heat transfer spaces; the device can effectively recover waste heat and avoid resource waste.

Description

Technical Field

[0001] This utility model relates to the field of industrial equipment technology, and in particular to a device for utilizing waste heat from a furnace. Background Technology

[0002] The high-temperature flue gas emitted from chimneys often carries a large amount of waste heat. If this waste heat cannot be effectively recovered and utilized, it will not only result in a huge waste of energy but also have adverse effects on the environment. However, existing chimney waste heat recovery technologies still face many challenges, resulting in a large amount of waste heat not being effectively utilized.

[0003] A boiler chimney capable of recovering waste heat from flue gas, as disclosed in patent application publication number CN107543321A, includes a chimney body, a cold water supply tank, and a hot and warm water collection tank. The chimney body is composed of an inlet chimney, a flue gas heat exchanger, an exhaust chimney, a large chimney cover, and a small chimney cover. The inlet chimney is welded to the bottom surface of the flue gas heat exchanger, and the exhaust chimney is welded to the top surface of the flue gas heat exchanger. The large chimney cover is installed at the upper end of the exhaust chimney, and the small chimney cover is installed at the upper end of the large chimney cover. The flue gas heat exchanger is composed of an inner cylinder and an outer cylinder, with the outer cylinder welded to the outer wall of the inner cylinder. A first fixing frame is installed at the upper right end of the outer cylinder, and the cold water supply tank is installed on the first fixing frame. A second fixing frame is installed at the lower left end of the outer cylinder, and the hot and warm water collection tank is installed on the second fixing frame.

[0004] The applicant has discovered that existing methods using chimney walls as flue gas heat exchangers have limited surface area and lack heat exchange materials inside the flue gas. Consequently, the flue gas cannot be adequately heated and dehumidified. The flue gas temperature at the end of the line remains high, resulting in significant residual heat and poor heat recovery. Utility Model Content

[0005] The purpose of this invention is to provide a furnace waste heat utilization device to solve the technical problem of poor waste heat recovery effect in the prior art.

[0006] To solve the above problems, the waste heat recovery device for furnaces involved in this utility model adopts the following technical solution:

[0007] The waste heat utilization device for a furnace provided by this utility model includes multiple main flues arranged at equal intervals along the vertical direction. The multiple main flues are connected end to end in sequence. Multiple heat dissipation pipes are arranged at intervals on the upper wall of any main flue and are connected to the heat transfer space above it. A heat insulation cover is fitted on the outer side of any adjacent main flue to seal the heat transfer space between their corresponding main flues. A fluid outlet and a fluid inlet are respectively opened at the two diagonal ends of the heat transfer space on the heat insulation cover. Between adjacent heat transfer spaces, the fluid inlet located in the lower layer is connected to the fluid outlet located in the upper layer.

[0008] Preferably, it also includes a fluid conveying device, the outlet of which is connected to the fluid inlet located at the top layer.

[0009] Preferably, the height of the fluid outlet on any heat shield is higher than the height of the fluid inlet on it.

[0010] Preferably, the fluid outlet and fluid inlet on any heat insulation cover are located at the inlet and outlet ends of the main flue on its lower side, respectively.

[0011] Preferably, each main flue has a cleaning window at both its inlet and outlet ends to control its connection with the outside.

[0012] Preferably, the fluid conveying equipment is configured as a fan or a water pump.

[0013] The beneficial effects of this utility model are as follows:

[0014] This utility model provides a furnace waste heat recovery device, comprising multiple main flues arranged at equal intervals along the vertical direction, connected end to end. The difference from existing technologies lies in the fact that each main flue has multiple spaced heat dissipation pipes on its upper wall, connected to its upper heat transfer space. A heat insulation cover is fitted over the outer side of any adjacent main flue to seal the heat transfer space between them. Flue outlets and inlets are respectively opened at opposite ends of the heat transfer space on the heat insulation cover. Between adjacent heat transfer spaces, the fluid inlet in the lower layer is connected to the fluid outlet in the upper layer. This multi-layered main flue and numerous heat dissipation pipes significantly increase the heat exchange surface. Furthermore, the heat dissipation pipes extend evenly into the flue gas, connecting the interior of the pipes with the heat dissipation space, allowing the flue gas to be cooled comprehensively. The multi-layered design, with the fluid and flue gas flowing in opposite directions and arranged in multiple layers, ensures that the fluid gradually heats up, eventually approaching the furnace outlet flue gas temperature, while the flue gas gradually cools down, eventually reaching the initial temperature of the fluid, resulting in a very low exhaust gas temperature and excellent waste heat recovery. Furthermore, the heated fluid temperature rises significantly, making it highly valuable. It is also equipped with a dust removal window, which allows for regular dust removal to maintain good heat exchange performance and prevent flue blockage. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below:

[0016] Figure 1 This is a schematic diagram of a furnace waste heat utilization device.

[0017] Figure 2 for Figure 1 Side view;

[0018] Figure 3 A cross-sectional view of the upper wall of the main flue.

[0019] In the diagram: 1. Main flue; 2. Connecting pipe; 3. Heat dissipation pipe; 4. Heat transfer space; 5. Fluid conveying equipment; 6. Fluid outlet; 7. Fluid inlet; 8. Dust removal window. Detailed Implementation

[0020] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] This utility model provides a furnace waste heat utilization device for installation at the furnace exhaust port, as shown in the figure. The device includes multiple main flues 1 arranged at equal intervals and parallel to each other in the vertical direction. The multiple main flues 1 are connected end to end to form a channel in a continuous state. In one embodiment, the main flue 1 is set as a rectangular cavity structure with open ends. The inlet of the flue gas in the main flue 1 is defined as the inlet end and the outlet of the flue gas is defined as the outlet end. The outlet end of the lower main flue 1 extends upward to connect with the inlet end of the upper main flue 1. Multiple heat dissipation pipes 3 are arranged at intervals on the upper wall of any main flue 1. Any heat dissipation pipe 3 extends evenly into the flue gas in the flue. The interior of the heat dissipation pipe 3 is connected to the heat dissipation space and the lower end is closed. The upper wall of the main flue 1 and the heat dissipation pipes 3 are used to transfer the heat of the flue gas to the fluid in the heat transfer space 4 to improve the heat transfer efficiency.

[0022] To guide the flow of waste heat, a heat insulation cover is installed on the outer side of any adjacent main flue 1. The heat insulation cover effectively seals the heat transfer space 4 between its corresponding main flue 1 (defined as the space between adjacent main flue 1). Fluid outlets 6 and fluid inlets 7 are respectively opened at the diagonal ends of the heat transfer space 4 on the heat insulation cover. Between adjacent heat transfer spaces 4, the fluid inlet 7 in the lower layer is connected to the fluid outlet 6 in the upper layer via a connecting pipe 2, forming a complete fluid flow channel. This allows the fluid to pass through each heat transfer space 4 sequentially and orderly, thereby carrying away the heat absorbed from each layer and improving heat utilization efficiency.

[0023] This device also includes a fluid conveying device 5, the outlet of which is connected to the fluid inlet 7 located at the top layer. The fluid conveying device 5 powerfully delivers fluid into the heat transfer space 4, greatly accelerating the heat transfer rate. The advantage is that the fluid entering from the top layer has a lower temperature, while the exhaust gas is cooled layer by layer from bottom to top, ultimately resulting in an even lower exhaust gas temperature, closer to atmospheric temperature. Meanwhile, the fluid entering from the top layer is gradually heated by the exhaust gas, eventually reaching a temperature close to the exhaust gas temperature at the furnace outlet. In other words, the exhaust gas carries away less heat while recovering more heat. The fluid conveying device 5 is a fan or water pump, and the fluid is either liquid or gas.

[0024] Optionally, an insulation layer is provided on the outer surface of the entire device to prevent heat loss.

[0025] The fluid outlet 6 and fluid inlet 7 on any heat insulation cover are located on the lower side corresponding to the smoke inlet end and smoke outlet end of the main flue 1, respectively. At the same time, in order to ensure good heat transfer, the height of the fluid outlet 6 on any heat insulation cover is higher than the height of the fluid inlet 7 above it. The fluid temperature is relatively low and the density is high when it first enters each layer, so it settles at the bottom. After being heated, the density decreases and it becomes lighter and floats on the top. Therefore, the fluid exiting the upper part of the fluid outlet 6 is the heated fluid. This design allows the fluid to naturally form a stable convection in the heat transfer space 4, which further improves the heat transfer efficiency.

[0026] Each main flue 1 has a cleaning window 8 at both the inlet and outlet ends to control its connection with the outside world, which facilitates periodic disassembly for cleaning and purging of the flue.

[0027] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A furnace waste heat utilization device, characterized in that, It includes multiple main flues arranged at equal intervals along the vertical direction. The main flues are connected end to end in sequence. The upper wall of any main flue is provided with multiple heat dissipation pipes that are spaced apart and connected to the heat transfer space above it. A heat insulation cover is fitted on the outside of any adjacent main flue to seal the heat transfer space between their corresponding main flues. The heat insulation cover has a fluid outlet and a fluid inlet at the two diagonal ends of the heat transfer space. Between adjacent heat transfer spaces, the fluid inlet in the lower layer is connected to the fluid outlet in the upper layer.

2. The furnace waste heat utilization device according to claim 1, characterized in that, It also includes fluid conveying equipment, the outlet of which is connected to the fluid inlet located at the top.

3. The furnace waste heat utilization device according to claim 2, characterized in that, The height of the fluid outlet on any heat shield is higher than the height of the fluid inlet on it.

4. The furnace waste heat utilization device according to claim 3, characterized in that, The fluid outlet and fluid inlet on any heat insulation cover are located at the inlet and outlet ends of the main flue on its lower side, respectively.

5. The furnace waste heat utilization device according to claim 1, characterized in that, Each main flue has a cleaning window at both the inlet and outlet ends to control its connection with the outside world.

6. The furnace waste heat utilization device according to claim 2, characterized in that, Fluid transport equipment is set as a fan or water pump.

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