Waste heat recovery device of high-efficiency heat treatment furnace

Abstract

The utility model belongs to the field of waste heat recovery devices, and discloses a waste heat recovery device of a high-efficiency heat treatment furnace, which comprises a bottom plate connected with an exchange pipe and a preheating box, the exchange pipe is connected with a heat exchange pipe, the heat exchange pipe is connected with an air inlet pipe and an air outlet pipe, the exchange pipe is connected with a water inlet pipe and a water outlet pipe, and the preheating box is connected with a water pump. The water inlet pipe is connected with the water pump, the preheating box is connected with a heat insulation bag, the air outlet pipe is connected with the heat insulation bag, the heat insulation bag is connected with an exhaust pipe, the preheating box is connected with a heat conduction pipe, the heat conduction pipe is connected with a plurality of sets of heat conduction fins, and the multiple sets of heat conduction fins are located on the inner sides of the preheating box and the heat insulation bag respectively. According to the technical scheme, residual heat of hot air is absorbed as much as possible while cold water is preheated, the waste heat recovery efficiency is improved, and the recovery efficiency is improved; warm water and hot air always keep a large temperature difference, the heat transfer efficiency is improved, and the recovery efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of waste heat recovery devices, in particular to a waste heat recovery device for a high-efficiency heat treatment furnace. Background Art

[0002] Waste heat recovery refers to the recycling and reuse of waste heat generated by industrial processes; it is mainly completed by preheating recovery through heat exchange technology. According to the temperature grade, industrial waste heat is generally divided into three types: high-temperature waste heat above 600°C, medium-temperature waste heat between 300 and 600°C, and low-temperature waste heat below 300°C; most of the heat treatment furnaces currently used are hot flue gas, and the waste heat recovery device completes waste heat recovery through gas-liquid heat exchange, that is, the gas and liquid flow in different flow pipes respectively, and then the gas-liquid temperature exchange is completed through pipeline heat transfer, and the heat of the gas is transferred to the liquid to complete the waste heat recovery. However, this setting still has the following technical problems in actual use: as the water temperature rises and the gas temperature drops, the temperature difference between the two gradually decreases, which reduces the heat transfer efficiency, but at this time the hot air is also flowing, and the air will be discharged into the recovery device as the air flows, thereby reducing the recovery efficiency of the heat in the hot gas, and the use effect is poor. Utility Model Content

[0003] The utility model aims to provide a waste heat recovery device for a high-efficiency heat treatment furnace to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] A waste heat recovery device for a high-efficiency heat treatment furnace comprises a base plate, the base plate is connected to an exchange tube and a preheating box, the exchange tube is connected to a heat exchange tube, the heat exchange tube is connected to an air inlet pipe and an air outlet pipe, the exchange tube is connected to a water inlet pipe and a water outlet pipe, the preheating box is connected to a water pump, the water inlet pipe is connected to the water pump, the preheating box is connected to an insulation bag, the air outlet pipe is connected to the insulation bag, the insulation bag is connected to an exhaust pipe, the preheating box is connected to a heat conduction pipe, the heat conduction pipe is connected to heat conduction fins, the heat conduction fins are provided in a plurality of groups, and the plurality of groups of heat conduction fins are respectively located on the inner sides of the preheating box and the insulation bag.

[0006] Preferably, the exchange tube is arranged in a serpentine shape.

[0007] Preferably, the exchange tubes are provided in several groups.

[0008] Preferably, the preheating box is threadedly connected with a box cover.

[0009] Preferably, the air intake pipe and the exhaust pipe are respectively connected to a control switch.

[0010] Compared with the prior art, this technical solution produces the following beneficial effects:

[0011] (1) The technical solution sets up a preheating box, and the hot air after the flow heat exchange is discharged into the insulation bag. At this time, the residual heat in the hot air is transferred to the cold water in the preheating box through the action of the heat-conducting fins and the heat-conducting tubes. While preheating the cold water, the residual heat of the hot air is absorbed as much as possible, thereby improving the waste heat recovery efficiency. At this time, the cold water in the waste heat box is at the lowest temperature point, which can absorb the residual heat of the hot air in the insulation bag more quickly, thereby improving the recovery efficiency. After the water in the preheating box enters the exchange tube, it first exchanges heat with the hot air at the end. At this time, the water temperature is relatively low, and the hot air temperature is also lower than when it enters the exchange tube. The temperature difference between the two is still in a relatively large range, thereby improving the heat transfer efficiency. As the water flows, the temperature of the water gradually rises, and the water gradually contacts the hot air with a higher temperature, thereby making the warm water always maintain a relatively large temperature difference with the hot air, thereby improving the heat transfer efficiency and the recovery efficiency.

[0012] (2) This technical solution increases the heat exchange time while reducing the storage space by arranging the exchange tubes in a serpentine shape; the diameter of the exchange tubes can be reduced by using several groups of exchange tubes, so that the hot air can be divided into multiple air flows to improve the heat exchange efficiency; the box cover facilitates the inspection and maintenance of the heat transfer fins, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front cross-sectional view of the utility model;

[0014] Figure 2 A top view of a partial cross-sectional view of a heat exchange tube is provided for the utility model;

[0015] Figure numerals: base plate 1, preheating box 2, water pump 3, exchange tube 4, heat exchange tube 5, air inlet pipe 6, control switch 7, water outlet pipe 8, water inlet pipe 9, box cover 10, air outlet pipe 11, exhaust pipe 12, heat conduction fins 13, heat conduction tube 14, insulation bag 15. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0017] like Figure 1 and Figure 2The waste heat recovery device of a high-efficiency heat treatment furnace shown in the figure includes a base plate 1, the base plate 1 is connected to an exchange tube 4 and a preheating box 2, the exchange tube 4 is connected to a heat exchange tube 5, the heat exchange tube 5 is located on the inner side of the exchange tube 4, the heat exchange tube 5 is connected to an air inlet pipe 6 and an air outlet pipe 11, the exchange tube 4 is connected to a water inlet pipe 9 and a water outlet pipe 8, the inner side of the preheating box 2 is connected to a water pump 3, the water inlet pipe 9 is connected to the water pump 3, the preheating box 2 is connected to an insulation bag 15, the insulation bag 15 is foldable, the air outlet pipe 11 is connected to the insulation bag 15, the insulation bag 15 is connected to an exhaust pipe 12, the preheating box 2 is connected to a heat conduction pipe 14, the heat conduction pipe 14 is connected to heat conduction fins 13, the heat conduction fins 13 are provided with a plurality of groups, and the plurality of groups of heat conduction fins 13 are respectively located on the inner sides of the preheating box 2 and the insulation bag 15, and the exchange tube 4 is arranged in a serpentine shape. Several groups of exchange tubes 4 are provided, and both ends of the several groups of exchange tubes 4 are connected to the air inlet pipe 6 and the air outlet pipe 11. The preheating box 2 is threadedly connected to the box cover 10, the box cover 10 is connected to the water supply pipe, and the air inlet pipe 6 and the exhaust pipe 12 are respectively connected to the control switch 7.

[0018] The specific implementation process is as follows:

[0019] Cold water is added into the preheating box 2 through the water supply pipe, the control switch 7 of the air inlet pipe 6 and the water pump 3 are turned on, and the hot air flows along the air inlet pipe 6, the heat exchange pipe 5, and the air outlet pipe 11, that is, it flows from left to right. Under the action of the water pump 3, the water in the preheating box 2 is pumped out, and the water flows into the exchange pipe 4 along the water inlet pipe 9, and then flows along the exchange pipe 4 through the heat exchange pipe 5 to exchange heat with the hot air, and then is discharged from the water outlet pipe 8. As the hot air moves from left to right, the heat is gradually transferred to the water. Therefore, when the hot air reaches the air outlet pipe 11, only a small amount of heat remains. In the process of flowing from right to left, the water gradually absorbs heat, and the temperature gradually increases, and finally is discharged from the water outlet pipe 8. Therefore, when the water with a lower temperature just enters the exchange pipe 4, it contacts the hot air with a lower temperature at the right end (the lower temperature mentioned here is relative to the problem when the hot air just enters the exchange pipe 4). There is a certain temperature difference between the two, and the heat exchange efficiency is relatively strong. When the water reaches the left side of the exchange pipe 4, the temperature of the water increases. At this time, the water contacts The hot air that touches the heat exchange tube 4 is at a relatively high temperature. There is still a large temperature difference between the two, and the heat exchange efficiency is relatively strong. After the heat exchange, the hot air carries the residual heat into the insulation bag 15. At this time, there is no air in the insulation bag 15, and the control switch 7 on the exhaust pipe 12 is also closed. Therefore, after the hot air enters the insulation bag 15, the insulation bag 15 expands, and the hot air gathers in the insulation bag 15. Then, the residual heat carried by the hot air is transferred to the cold water in the preheating box 2 through the heat conducting fins 13 and the heat conducting pipes 14, and the cold water is preheated to complete the recovery of the residual heat, thereby improving the recovery efficiency and recovery quality. According to the actual situation and usage, water can be continuously replenished into the preheating box 2 through the water replenishing pipe, and the box cover 10 can be unscrewed later to inspect the heat conducting fins 13 and the like. After the hot air in the insulation belt gathers to a certain extent and the hot air has been transferred to a certain extent, the exhaust pipe 12 switch is turned on, and then the gas that has completed heat recovery in the insulation bag 15 can be discharged.

[0020] The present technical solution sets up a preheating box 2, and the hot air after the flow heat exchange is discharged into the insulation bag 15. At this time, the heat remaining in the hot air is transferred to the cold water in the preheating box 2 through the action of the heat-conducting fins 13 and the heat-conducting pipes 14, and the residual heat of the hot air is absorbed as much as possible while the cold water is preheated, thereby improving the waste heat recovery efficiency. At this time, the cold water in the waste heat box is at the lowest temperature, and can absorb the residual heat of the hot air in the insulation bag 15 more quickly, thereby improving the recovery efficiency. After the water in the preheating box 2 enters the exchange tube 4, it first exchanges heat with the hot air at the end. At this time, the water temperature is relatively low, and the hot air temperature is relatively high. The temperature is also lower than when it just enters the exchange tube 4, and the temperature difference between the two is still in a large range, which improves the heat transfer efficiency; as the water flows, the temperature gradually rises, and the water gradually contacts the hot air with a higher temperature, so that the warm water always maintains a large temperature difference with the hot air, which improves the heat transfer efficiency and the recovery efficiency; the serpentine arrangement of the exchange tube 4 increases the heat exchange time while reducing the storage space; through a plurality of groups of exchange tubes 4, the diameter of the exchange tube 4 can be reduced, so that the hot air can be divided into multiple airflows to improve the heat exchange efficiency; the box cover 10 facilitates the inspection and maintenance of the heat-conducting fins 13, etc.

[0021] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A waste heat recovery device for a high-efficiency heat treatment furnace, characterized in that: The invention comprises a bottom plate (1), wherein the bottom plate (1) is connected to an exchange tube (4) and a preheating box (2), wherein the exchange tube (4) is connected to a heat exchange tube (5), wherein the heat exchange tube (5) is connected to an air inlet tube (6) and an air outlet tube (11), wherein the exchange tube (4) is connected to a water inlet tube (9) and a water outlet tube (8), wherein the preheating box (2) is connected to a water pump (3), wherein the water inlet tube (9) is connected to the water pump (3), and wherein the preheating box (2 ) is connected to an insulation bag (15), the air outlet pipe (11) is connected to the insulation bag (15), the insulation bag (15) is connected to an exhaust pipe (12), the preheating box (2) is connected to a heat conduction pipe (14), the heat conduction pipe (14) is connected to heat conduction fins (13), the heat conduction fins (13) are provided with a plurality of groups, and the plurality of groups of heat conduction fins (13) are respectively located on the inner side of the preheating box (2) and the insulation bag (15).

2. The waste heat recovery device for a high-efficiency heat treatment furnace according to claim 1, characterized in that: The exchange tube (4) is arranged in a serpentine shape.

3. The waste heat recovery device for a high-efficiency heat treatment furnace according to claim 1, characterized in that: The exchange tubes (4) are provided in a plurality of groups.

4. The waste heat recovery device for a high-efficiency heat treatment furnace according to claim 1, characterized in that: The preheating box (2) is threadedly connected with a box cover (10).

5. The waste heat recovery device for a high-efficiency heat treatment furnace according to claim 1, characterized in that: The air intake pipe (6) and the exhaust pipe (12) are respectively connected to a control switch (7).

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