Efficient cooling waste heat recovery system and energy-saving tunnel kiln

Abstract

The utility model discloses an efficient cooling waste heat recovery system and an energy-saving tunnel kiln, and relates to the technical field of tunnel kilns. Wherein the multiple heat exchange pipes extend in the first direction and are arranged at intervals in the second direction, and the ends of any two adjacent heat exchange pipes on the same side are connected, so that all the heat exchange pipes form a snakelike structure which extends in a winding mode in the second direction and is used for cooling the tunnel kiln; a cold water branch pipe and a hot water branch pipe which extend in the second direction are arranged on the two sides of the heat exchange pipe in the first direction, and the cold water branch pipe is provided with a first water inlet end and a plurality of first water outlet ends which are arranged at intervals in the second direction and provided with first control valves. The hot water branch pipe is provided with a second water outlet end and a plurality of second water inlet ends which are arranged at intervals in the second direction and provided with second control valves. The first water outlet end and the second water inlet end located on the two sides of the snakelike structure in the first direction are in one-to-one correspondence and are connected with the two ends of the same heat exchange pipe correspondingly, and the first direction, the second direction and the vertical direction are perpendicular pairwise. The cooling device is good in cooling effect and high in waste heat utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel kilns, and particularly relates to a waste heat recovery system with efficient cooling and an energy-saving tunnel kiln. Background Art

[0002] A tunnel kiln is a continuous firing kiln furnace device, mainly used for the roasting of products such as bricks and ceramics. The structure of the tunnel kiln includes a preheating section, a firing section, and a cooling section. Among them, at the cooling section of the tunnel kiln, a cooling method of directly blowing cold air is adopted, so that the cold air and the high-temperature products directly conduct convective heat transfer, so as to achieve the purpose of cooling and reducing the temperature of the products. However, after the cold air absorbs heat and rises in temperature to become hot air, a part of the hot air is used for the preheating section, and the other part of the hot air still has a very high temperature, but it is difficult to store and utilize. Usually, a heat extraction fan is used to discharge the hot air from the furnace of the tunnel kiln to the outside, which will cause a large amount of heat energy loss and cannot be reasonably utilized, thus resulting in a low waste heat utilization rate. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a waste heat recovery system with efficient cooling and an energy-saving tunnel kiln, which has good cooling effect and high waste heat utilization rate.

[0004] The first aspect embodiment of the utility model provides a waste heat recovery system with efficient cooling, which includes:

[0005] Heat exchange tubes, which extend along a first direction, and a plurality of the heat exchange tubes are provided and arranged at intervals along a second direction. The ends on the same side of any two adjacent heat exchange tubes are connected, so that all the heat exchange tubes jointly form a serpentine structure that extends in a meandering manner along the second direction and is used for cooling the tunnel kiln;

[0006] Cold water branch pipes, which extend along the second direction. The heat exchange tubes are provided with the cold water branch pipes on both sides along the first direction. Each cold water branch pipe is provided with a first water inlet end and a plurality of first water outlet ends arranged at intervals along the second direction. The first water outlet ends are provided with first control valves;

[0007] Hot water branch pipes, which extend along the second direction. The heat exchange tubes are provided with the hot water branch pipes on both sides along the first direction. Each hot water branch pipe is provided with a second water outlet end and a plurality of second water inlet ends arranged at intervals along the second direction. The second water inlet ends are provided with second control valves;

[0008] Wherein, the first water outlet ends and the second water inlet ends on both sides of the serpentine structure along the first direction correspond to each other one by one, and are respectively connected to both ends of the same heat exchange tube. The first direction, the second direction, and the up-down direction are perpendicular to each other in pairs.

[0009] The high-efficiency cooling waste heat recovery system according to the first aspect embodiment of the present utility model has at least the following beneficial effects: By arranging a serpentine structure formed by connecting multiple heat exchange tubes in the cooling section of the tunnel kiln, cold water branch pipes and hot water branch pipes are arranged on both sides of the serpentine structure along the first direction. The opposite ends of each heat exchange tube are respectively connected to a first water outlet end of the cold water branch pipe and a second water inlet end of the hot water branch pipe. Then, the opening degrees of all the first control valves on the cold water branch pipe and all the second control valves on the hot water branch pipe can be adjusted accordingly to simultaneously meet the actual hot water temperature requirement and the cooling and temperature reduction requirement of the tunnel kiln. The cold water flowing in the serpentine structure will absorb heat and become hot water, realizing the cooling and temperature reduction of the products in the cooling section. At the same time, the waste heat can be stored in the form of hot water and effectively utilized, achieving the purpose of waste heat recovery and utilization.

[0010] Compared with the direct air-blowing cooling method, in this embodiment, the heat exchange tubes with cold water flowing through are used for convective heat exchange with the high-temperature air in the cooling section, allowing the cold water to take away most of the heat at the cooling section, which can improve the cooling and temperature reduction effect and the waste heat utilization rate. Moreover, it can also significantly reduce the cooling air volume blown into the cooling section and the hot air volume extracted, thereby saving the electric energy consumed by the tunnel kiln for air extraction and supply.

[0011] In some embodiments of the present utility model, the high-efficiency cooling waste heat recovery system further includes a first bellows and a second bellows. The first water outlet end is connected to the end of the heat exchange tube through the first bellows, and the second water inlet end is connected to the end of the heat exchange tube through the second bellows.

[0012] In some embodiments of the present utility model, the high-efficiency cooling waste heat recovery system further includes a third bellows. The ends on the same side of any two adjacent heat exchange tubes are connected through the third bellows.

[0013] In some embodiments of the present utility model, the high-efficiency cooling waste heat recovery system further includes a cold water supply pipe and a hot water return pipe. All the first water inlet ends are connected to the cold water supply pipe, and all the second water outlet ends are connected to the hot water return pipe.

[0014] In some embodiments of the present utility model, the high-efficiency cooling waste heat recovery system further includes a hot water tank, and the hot water return pipe is connected to the hot water tank.

[0015] In some embodiments of the present utility model, the high-efficiency cooling waste heat recovery system further includes a heat preservation member; both the hot water branch pipe and the hot water return pipe are covered with the heat preservation member.

[0016] In some embodiments of the present utility model, the high-efficiency cooling waste heat recovery system further includes a cold water tank and a water pump, and the cold water tank, the water pump, and the cold water supply pipe are connected in sequence.

[0017] In some embodiments of the present utility model, the heat exchange tubes are finned tubes.

[0018] In some embodiments of the present utility model, the first control valve and the second control valve are manual valves or automatic valves.

[0019] A second aspect embodiment of the present utility model provides an energy-saving tunnel kiln, which includes:

[0020] A tunnel kiln body having a kiln cavity extending in a second direction;

[0021] The highly efficient cooling waste heat recovery system as described in the first aspect embodiment, all of the heat exchange tubes are arranged in the kiln cavity, and the cold water branch pipe, the hot water branch pipe, the first control valve and the second control valve are all arranged outside the kiln cavity.

[0022] The energy-saving tunnel kiln according to the second aspect embodiment of the present utility model has at least the following beneficial effects: By adopting the above waste heat recovery system in the cooling section of the tunnel kiln body, the cooling and temperature reduction effect on the products in the cooling section can be improved through the convective heat exchange between the heat exchange tubes through which cold water flows and the high-temperature air, and most of the waste heat can be recovered, improving the waste heat utilization rate, reducing heat loss, and achieving the purpose of energy conservation and consumption reduction.

[0023] Other features and advantages of the present utility model will be described in the subsequent description, and part of them will be obvious from the description, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the structures specifically pointed out in the description, the claims, and the drawings. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of an energy-saving tunnel kiln provided according to an embodiment of the present utility model;

[0025] Figure 2 is a three-dimensional structural diagram of a highly efficient cooling waste heat recovery system provided according to an embodiment of the present utility model;

[0026] Figure 3 is a three-dimensional structural diagram of an energy-saving tunnel kiln provided according to an embodiment of the present utility model;

[0027] Figure 4 is a three-dimensional structural diagram of an energy-saving tunnel kiln provided according to another embodiment of the present utility model.

[0028] Reference numerals: 111, cold water supply pipe; 112, hot water return pipe; 121, cold water branch pipe; 122, hot water branch pipe; 131, first control valve; 132, second control valve; 141, first corrugated pipe; 142, second corrugated pipe; 143, third corrugated pipe; 150, heat exchange pipe; 161, cold water tank; 162, water pump; 163, hot water tank; 164, water replenishing port; 200, tunnel kiln body; 210, kiln cavity; 220, kiln wall. Detailed implementation manners

[0029] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0030] In the description of the present utility model, it should be understood that the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] Reference is made below to Figures 1 to 4 Describe a highly efficient cooling waste heat recovery system and an energy-saving tunnel kiln provided according to an embodiment of the present utility model.

[0033] As Figures 1 to 4 shown, the highly efficient cooling waste heat recovery system according to the first aspect embodiment of the present utility model can be used in a tunnel kiln, especially installed in the cooling section of the tunnel kiln, and can perform cooling and temperature reduction treatment on the products in the cooling section. Moreover, the highly efficient cooling waste heat recovery system has the advantages of good cooling effect and high waste heat utilization rate.

[0034] The highly efficient cooling waste heat recovery system has a first direction, a second direction, and an up-and-down direction. The first direction is perpendicular to the second direction and the up-and-down direction respectively, and the second direction is perpendicular to the up-and-down direction. In this embodiment, it is assumed that the first direction is the left-right direction and the second direction is the front-back direction.

[0035] The waste heat recovery system with efficient cooling includes a heat exchange tube 150, a cold water branch pipe 121, a hot water branch pipe 122, a first control valve 131, and a second control valve 132.

[0036] The length of the heat exchange tube 150 extends along a first direction. There are multiple heat exchange tubes 150, and moreover, the multiple heat exchange tubes 150 are arranged at a certain interval along a second direction. It can be understood that the number and size of the heat exchange tubes 150 can be set according to actual situations and are not specifically limited herein. In some examples, the heat exchange tube 150 is a circular tube. In other examples, the heat exchange tube 150 is a finned tube. In this embodiment, the structure of the heat exchange tube 150 includes a tube body and fins. There are multiple fins, and the multiple fins are arranged at a certain interval along the extension direction of the tube body. Of course, it is not excluded that in other embodiments, the fins extend spirally along the outer wall of the tube body.

[0037] The heat exchange tube 150 adopts a finned tube, which can increase the convective heat exchange area between the heat exchange tube 150 and the high-temperature air in the tunnel kiln, is beneficial to enhancing the heat exchange effect, and thus can realize efficient cooling and temperature reduction of the tunnel kiln.

[0038] For any two adjacent heat exchange tubes 150, the ends on the same side of the two heat exchange tubes 150 can be connected by a pipeline, so that the two heat exchange tubes 150 are connected and communicated. Therefore, after all the heat exchange tubes 150 are connected, all the heat exchange tubes 150 together form a serpentine structure, and the serpentine structure extends meanderingly along the second direction. The function of the serpentine structure is for tunnel kiln cooling. It can be understood that the number of serpentine structures is not limited to one and can be selected according to actual situations and is not specifically limited herein.

[0039] For example, if the serpentine structure includes four heat exchange tubes 150, the four heat exchange tubes 150 are arranged at intervals in sequence along the second direction. Among them, the left end of the first heat exchange tube 150 is connected to the left end of the second heat exchange tube 150 by a pipeline, the right end of the second heat exchange tube 150 is connected to the right end of the third heat exchange tube 150 by a pipeline, and the left end of the third heat exchange tube 150 is connected to the left end of the fourth heat exchange tube 150 by a pipeline, so that the four heat exchange tubes 150 are connected into a serpentine structure with three corners. A cooling liquid, such as cold water, flows in the serpentine structure.

[0040] The length of the cold water branch pipe 121 extends along the second direction, and the heat exchange pipe 150 is provided with cold water branch pipes 121 on both sides in the first direction. Specifically, two cold water branch pipes 121 are provided, one of the cold water branch pipes 121 is located on the left side of the serpentine structure, and the other cold water branch pipe 121 is located on the right side of the serpentine structure. Each cold water branch pipe 121 is provided with a first water inlet end and a first water outlet end. Among them, one first water inlet end is provided, and the first water inlet end can be located at the front end, middle or rear end of the cold water branch pipe 121. A plurality of first water outlet ends are provided, and the plurality of first water outlet ends are arranged at certain intervals along the second direction. Moreover, a first control valve 131 is provided at the first water outlet end, and the opening and closing of the first control valve 131 can control the on-off of the first water outlet end.

[0041] The length of the hot water branch pipe 122 extends along the second direction, and the heat exchange pipe 150 is provided with hot water branch pipes 122 on both sides in the first direction. Specifically, two hot water branch pipes 122 are provided, one of the hot water branch pipes 122 is located on the left side of the serpentine structure, and the other hot water branch pipe 122 is located on the right side of the serpentine structure. Each hot water branch pipe 122 is provided with a second water inlet end and a second water outlet end. Among them, one second water outlet end is provided, and the second water outlet end can be located at the front end, middle or rear end of the hot water branch pipe 122. A plurality of second water inlet ends are provided, and the plurality of second water inlet ends are arranged at certain intervals along the second direction. Moreover, a second control valve 132 is provided at the second water inlet end, and the opening and closing of the second control valve 132 can control the on-off of the second water inlet end.

[0042] Of course, the number of the first water inlet end and the second water outlet end is not limited to one.

[0043] It can be understood that the first control valve 131 and the second control valve 132 can be manual valves or automatic valves, and can remotely adjust the opening degrees of the first control valve 131 and the second control valve 132. In this embodiment, both the first control valve 131 and the second control valve 132 are ball valves. The two hot water branch pipes 122 are located between the two cold water branch pipes 121.

[0044] Among them, the first water outlet end and the second water inlet end located on both sides of the serpentine structure along the first direction correspond to each other one by one, and are respectively connected to both ends of the same heat exchange pipe 150. Specifically, the hot water branch pipe 122 located on the left side of the serpentine structure and the cold water branch pipe 121 located on the right side of the serpentine structure are arranged opposite to each other in the left-right direction. Therefore, the second water inlet end on the hot water branch pipe 122 and the first water outlet end on the cold water branch pipe 121 correspond to each other one by one, and they are respectively connected to the left and right ends of the same heat exchange pipe 150. The hot water branch pipe 122 located on the right side of the serpentine structure and the cold water branch pipe 121 located on the left side of the serpentine structure are arranged opposite to each other in the left-right direction. Therefore, the second water inlet end on the hot water branch pipe 122 and the first water outlet end on the cold water branch pipe 121 correspond to each other one by one, and they are respectively connected to the left and right ends of the same heat exchange pipe 150.

[0045] For example, the left end of the first heat exchange pipe 150 is connected to one of the second water inlet ends of the hot water branch pipe 122 located on the left side of the serpentine structure through a pipeline, the right end of the first heat exchange pipe 150 is connected to one of the first water outlet ends of the cold water branch pipe 121 located on the right side of the serpentine structure through a pipeline, and the left end of the first heat exchange pipe 150 is connected to the left end of the second heat exchange pipe 150 through a pipeline. The left end of the second heat exchange pipe 150 is connected to one of the first water outlet ends of the cold water branch pipe 121 located on the left side of the serpentine structure through a pipeline, and the right end of the second heat exchange pipe 150 is connected to one of the second water inlet ends of the hot water branch pipe 122 located on the right side of the serpentine structure through a pipeline. And so on, both ends of each heat exchange pipe 150 are respectively connected with a first water outlet end and a second water inlet end.

[0046] In the high-efficiency cooling waste heat recovery system provided by the first aspect embodiment of the present invention, since the serpentine structure formed by connecting multiple heat exchange pipes 150 is arranged inside the cooling section of the tunnel kiln, cold water branch pipes 121 and hot water branch pipes 122 are arranged on both sides of the serpentine structure along the first direction, and opposite ends of each heat exchange pipe 150 are respectively connected to a first water outlet end of the cold water branch pipe 121 and a second water inlet end of the hot water branch pipe 122. Therefore, corresponding opening adjustments can be made to all the first control valves 131 on the cold water branch pipes 121 and all the second control valves 132 on the hot water branch pipes 122, and the cold water input amount and hot water output amount of each heat exchange pipe 150 can be adjusted, so as to ensure that the actual hot water temperature requirement and the cooling and temperature reduction requirement of the tunnel kiln can be satisfied simultaneously.

[0047] When the corresponding first control valve 131 and the corresponding second control valve 132 are in the open state, cold water will flow into the serpentine structure. The cold water flowing in the serpentine structure will absorb the heat carried by the high-temperature air in the cooling section, thereby becoming hot water, thereby cooling the products in the cooling section. At the same time, the waste heat is stored in the form of hot water and effectively utilized. Specifically, the hot water is used as hot water for factory life, hot water for mud in the raw material pulping process, etc., thereby achieving the purpose of waste heat recovery and utilization.

[0048] Compared with the direct air blast cooling method adopted in the prior art, the first embodiment of the utility model conducts convection heat exchange between the heat exchange tube 150 through which cold water flows and the high-temperature air in the cooling section, and stores part of the heat energy taken away by the hot air directly discharged in the prior art in the water medium, so that the cold water can take away most of the heat in the cooling section, which can improve the cooling effect and the utilization rate of waste heat, and can also greatly reduce the cooling air volume blown into the cooling section and the hot air volume extracted, thereby reducing the electric energy consumed by the tunnel kiln air extraction.

[0049] In some embodiments, Figure 1 and Figure 2 As shown, the waste heat recovery system for efficient cooling also includes a first bellows 141 and a second bellows 142. The first water outlet is connected to the end of the heat exchange tube 150 through the first bellows 141, and the second water inlet is connected to the end of the heat exchange tube 150 through the second bellows 142. Specifically, the first water outlet is provided with a first control valve 131, one end of the first bellows 141 is connected to the first water outlet, and the other end of the first bellows 141 is connected to the end of the heat exchange tube 150. The second water inlet is provided with a second control valve 132, one end of the second bellows 142 is connected to the second water inlet, and the other end of the second bellows 142 is connected to the end of the heat exchange tube 150.

[0050] It is understandable that the first bellows 141 and the second bellows 142 can be stainless steel bellows. The first bellows 141 and the second bellows 142 have the advantages of good flexibility, light weight, corrosion resistance, fatigue resistance, high and low temperature resistance, etc., which can solve the problem of thermal expansion and contraction of the pipeline and avoid the problem of pipeline breakage during expansion and contraction.

[0051] Further, such as Figure 1 and Figure 2As shown, the waste heat recovery system with efficient cooling further includes a third corrugated pipe 143. Among them, the ends on the same side of any two adjacent heat exchange pipes 150 are connected by the third corrugated pipe 143. The third corrugated pipe 143 can be a stainless steel corrugated pipe. It can be understood that a tee joint can be provided at the end of the heat exchange pipe 150 so as to be connected to the third corrugated pipe 143 and the first corrugated pipe 141 at the same time, or connected to the third corrugated pipe 143 and the second corrugated pipe 142 at the same time.

[0052] In some embodiments, as Figures 1 to 3 shown, the waste heat recovery system with efficient cooling further includes a cold water supply pipe 111 and a hot water return pipe 112. Among them, all the first water inlet ends are connected to the cold water supply pipe 111, and all the second water outlet ends are connected to the hot water return pipe 112.

[0053] Specifically, the length of the cold water supply pipe 111 extends along the first direction, the length of the hot water return pipe 112 extends along the first direction, and the cold water supply pipe 111 and the hot water return pipe 112 are arranged at intervals along the second direction. The cold water supply pipe 111 and the hot water return pipe 112 are both located above the cold water branch pipe 121 and the hot water branch pipe 122. Each cold water branch pipe 121 is provided with a first water inlet end, and the first water inlet end is located at the middle position of the cold water branch pipe 121. The first water inlet end is connected to the first water outlet of the cold water supply pipe 111. Each hot water branch pipe 122 is provided with a second water outlet end, and the second water outlet end is located at the middle position of the hot water branch pipe 122. The second water outlet end is connected to the second water inlet of the hot water return pipe 112. Therefore, the same cold water supply pipe 111 supplies cold water to the two cold water branch pipes 121 at the same time, and the same hot water return pipe 112 converges the hot water provided by the two hot water branch pipes 122 and conveys it out uniformly.

[0054] Furthermore, as Figure 4 shown, the waste heat recovery system with efficient cooling further includes a hot water tank 163. Among them, the hot water return pipe 112 is connected to the hot water tank 163. Specifically, the hot water return pipe 112 is provided with a second water outlet, and the second water outlet is located above the hot water tank 163 and is connected to the inlet of the hot water tank 163. Therefore, the hot water return pipe 112 conveys hot water into the hot water tank 163. The hot water tank 163 has a heat preservation effect, which can prevent heat dissipation and maintain a certain water temperature.

[0055] Of course, a liquid level sensor and a temperature sensor can be provided in the hot water tank 163. The liquid level sensor is used to detect the water level in the hot water tank 163 to avoid the water level in the hot water tank 163 being too high or too low. The temperature sensor is used to detect the hot water temperature in the hot water tank 163.

[0056] Furthermore, as Figure 4As shown in the figure, the waste heat recovery system with efficient cooling further includes a cold water tank 161 and a water pump 162. Among them, the cold water tank 161, the water pump 162 and the cold water supply pipe 111 are connected in sequence. Specifically, the cold water supply pipe 111 is provided with a first water inlet, the inlet of the water pump 162 is connected to the outlet provided at the bottom of the cold water tank 161, and the outlet of the water pump 162 is connected to the first water inlet of the cold water supply pipe 111. By the operation of the water pump 162, the cold water in the cold water tank 161 is transported to the cold water supply pipe 111.

[0057] Of course, a water replenishing port 164 is provided at the upper part of the cold water tank 161, and the water replenishing port 164 can be connected to a water supply pipe. A liquid level sensor and a temperature sensor are provided in the cold water tank 161. The liquid level sensor is used to detect the water level in the cold water tank 161 to prevent the water level in the cold water tank 161 from being too high or too low. When the water level in the cold water tank 161 is too low, water can be replenished through the water replenishing port 164. The temperature sensor is used to detect the temperature of the cold water in the cold water tank 161.

[0058] In addition, valves can be provided at the inlet and outlet of the water pump 162.

[0059] In some embodiments, the waste heat recovery system with efficient cooling further includes a heat insulation member. Among them, both the hot water branch pipe 122 and the hot water return pipe 112 are coated with a heat insulation member. In this embodiment, the heat insulation member is heat insulating cotton. By providing the heat insulation member, the heat of the hot water in the hot water branch pipe 122 and the hot water return pipe 112 can be prevented from dissipating outward, ensuring that the water temperature of the hot water fluctuates little.

[0060] As Figures 1 to 4 shown, the energy-saving tunnel kiln according to the second aspect embodiment of the present invention includes a tunnel kiln body 200 and the waste heat recovery system with efficient cooling as in the first aspect embodiment.

[0061] The tunnel kiln body 200 has a kiln cavity 210, and the kiln cavity 210 extends in the second direction. The tunnel kiln body 200 includes a preheating section, a firing section and a cooling section. Among them, the cooling section also has a kiln cavity 210.

[0062] In the waste heat recovery system with efficient cooling, all the heat exchange tubes 150 are arranged in the kiln cavity 210 of the cooling section. Moreover, the cold water branch pipe 121, the hot water branch pipe 122, the first control valve 131 and the second control valve 132 are all arranged outside the kiln cavity 210 of the cooling section. In addition, both ends of the heat exchange tube 150 pass through the through holes provided in the kiln wall 220 of the tunnel kiln body 200, and the first corrugated pipe 141, the second corrugated pipe 142 and the third corrugated pipe 143 are located outside the kiln cavity 210 of the cooling section. The cold water supply pipe 111 and the hot water return pipe 112 are located above the tunnel kiln body 200.

[0063] When the energy-saving tunnel kiln is in operation, cold water in the cold water tank 161 can be pumped by the water pump 162 and sent to the cold water supply pipe 111. The cold water supply pipe 111 sends the cold water to two cold water branch pipes 121 respectively. Then, the cold water flows into the heat exchange pipe 150 from the first water outlet end of the cold water branch pipe 121 through the first control valve 131 and the first corrugated pipe 141, so as to conduct spaced heat exchange with the high-temperature air in the tunnel kiln body 200, and thus become hot water. Since the opening degrees of the first control valves 131 on the cold water branch pipe 121 can be the same or different, the cold water flow rates flowing into the heat exchange pipe 150 from the first water outlet end can be the same or different.

[0064] After the cold water absorbs heat and becomes hot water, the hot water can flow from the heat exchange pipe 150 through the second corrugated pipe 142 and the second control valve 132 into the hot water branch pipe 122, and the hot water in the hot water branch pipe 122 then flows to the hot water supply pipe. Finally, the hot water flowing in the hot water supply pipe flows into the hot water tank 163 for heat preservation storage.

[0065] Of course, for the same heat exchange pipe 150, if the opening degrees of the first control valve 131 and the second control valve 132 on both sides of the heat exchange pipe 150 are different, specifically, the opening degree of the first control valve 131 is greater than that of the second control valve 132, then the cold water flow rate flowing into the heat exchange pipe 150 is greater than the hot water flow rate flowing out of the heat exchange pipe 150, and the remaining hot water will flow to another heat exchange pipe 150 through the third corrugated pipe 143.

[0066] By adopting the above-mentioned waste heat recovery system in the cooling section of the tunnel kiln body 200, the cooling and temperature reduction effect on the products in the cooling section can be improved through the convection heat exchange mode between the heat exchange pipe 150 with cold water flowing through and the high-temperature air, and most of the waste heat can be recovered, the waste heat utilization rate can be increased, heat loss can be reduced, and the purpose of energy conservation and consumption reduction can be achieved.

[0067] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0068] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An afterheat recovery system with efficient cooling, characterized in that, Comprising: Heat exchange tubes (150) extending along a first direction, with multiple heat exchange tubes (150) provided and spaced along a second direction. The ends on the same side of any two adjacent heat exchange tubes (150) are connected, so that all the heat exchange tubes (150) together form a serpentine structure that extends in a serpentine manner along the second direction and is used for cooling a tunnel kiln; Cold water branch pipes (121) extending along the second direction. The heat exchange tubes (150) are provided with the cold water branch pipes (121) on both sides in the first direction. Each cold water branch pipe (121) is provided with a first water inlet end and a plurality of first water outlet ends spaced along the second direction, and the first water outlet ends are provided with first control valves (131); Hot water branch pipes (122) extending along the second direction. The heat exchange tubes (150) are provided with the hot water branch pipes (122) on both sides in the first direction. Each hot water branch pipe (122) is provided with a second water outlet end and a plurality of second water inlet ends spaced along the second direction, and the second water inlet ends are provided with second control valves (132); Wherein, the first water outlet ends and the second water inlet ends on both sides of the serpentine structure in the first direction correspond one by one and are respectively connected to both ends of the same heat exchange tube (150). The first direction, the second direction and the up-and-down direction are perpendicular to each other in pairs.

2. The highly efficient cooling waste heat recovery system according to claim 1, characterized in that Further comprising a first corrugated pipe (141) and a second corrugated pipe (142). The first water outlet end is connected to the end of the heat exchange tube (150) through the first corrugated pipe (141), and the second water inlet end is connected to the end of the heat exchange tube (150) through the second corrugated pipe (142).

3. The highly efficient cooling waste heat recovery system according to claim 2, wherein, Further comprising a third corrugated pipe (143). The ends on the same side of any two adjacent heat exchange tubes (150) are connected through the third corrugated pipe (143).

4. The high-efficiency cooling waste heat recovery system according to any one of claims 1 to 3, characterized in that Further comprising a cold water supply pipe (111) and a hot water return pipe (112). All the first water inlet ends are connected to the cold water supply pipe (111), and all the second water outlet ends are connected to the hot water return pipe (112).

5. The highly efficient cooling waste heat recovery system according to claim 4, characterized in that Further comprising a hot water tank (163). The hot water return pipe (112) is connected to the hot water tank (163).

6. The highly efficient cooling waste heat recovery system according to claim 5, characterized in that, Further comprising a heat insulation member; both the hot water branch pipe (122) and the hot water return pipe (112) are coated with the heat insulation member.

7. The highly efficient cooling waste heat recovery system according to claim 5, characterized in that, Further comprising a cold water tank (161) and a water pump (162). The cold water tank (161), the water pump (162) and the cold water supply pipe (111) are connected in sequence.

8. The high-efficiency cooling waste heat recovery system according to claim 1, characterized in that The heat exchange tube (150) is a finned tube.

9. The highly efficient cooling waste heat recovery system according to claim 1, characterized in that The first control valve (131) and the second control valve (132) are manual valves or automatic valves.

10. Energy-saving tunnel kiln, characterized in that, Comprising: A tunnel kiln body (200) having a kiln chamber (210) extending along the second direction; For the high-efficiency cooling waste heat recovery system according to any one of claims 1 to 9, all of the heat exchange tubes (150) are disposed inside the kiln cavity (210), and the cold water branch pipe (121), the hot water branch pipe (122), the first control valve (131), and the second control valve (132) are all disposed outside the kiln cavity (210).

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