A tunnel furnace exhaust smoke waste heat utilization structure

Abstract

The utility model discloses a kind of waste heat utilization structures for tunnel furnace smoke exhaust, it is related to waste heat utilization structure technical field, including multiple connection in tunnel furnace's smoke exhaust pipe, the top of multiple smoke exhaust pipe is connected with elbow pipe, adjacent two described elbow pipe are connected with outer sleeve pipe, the inside sleeve of outer sleeve pipe is equipped with circulation pipe, circulation pipe extends out outer sleeve pipe at both ends, and the both ends of outer sleeve pipe are connected with end cap between circulation pipe. The device is provided with elbow pipe and outer sleeve pipe component at the top of multiple smoke exhaust pipe, circulation pipe can be wrapped up, so that high-temperature flue gas can be attached to circulation pipe outside and flow, improve the heat exchange area with circulation pipe, increase the heat exchange effect, simultaneously, by the bending setting of circulation pipe, the residence time of liquid in circulation pipe can be increased, the heat exchange effect is further improved, avoid the situation that waste heat utilization effect is not good.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization structure technology, and more specifically to a waste heat utilization structure for tunnel furnace flue gas. Background Technology

[0002] Modern tunnel furnaces and kilns are equipped with flue gas exhaust pipes at the top to discharge the generated high-temperature flue gas, which often contains a high amount of heat, with temperatures ranging from 140 to 170°C. To improve energy recovery and utilization, liquid pipes are usually installed above the flue gas pipes to recover and utilize heat through heat exchange.

[0003] The waste heat recovery structures currently used for flue gas exhaust still have the following problems during use: 1. Waste heat recovery pipes usually pass directly through the flue gas pipes, resulting in excessively fast liquid flow rates and limited contact time with the flue gas, which cannot effectively raise the liquid temperature. At the same time, there is no sealed structure between the flue gas and the pipes, causing the flue gas to be discharged into the air after passing through the preheating pipes, which will have an impact on the surrounding environment.

[0004] 2. Since tunnel furnaces and kilns are equipped with multiple combustion chambers, when a particular combustion chamber is not in use, flue gas from other chambers will enter that chamber and affect it. At the same time, a fan structure is installed at the flue gas exhaust pipe to increase the exhaust speed, but flue gas will also leak out from the stopped fan, resulting in flue gas overflow.

[0005] Therefore, it is necessary to propose a waste heat utilization structure for tunnel furnace flue gas to solve the above problems. Utility Model Content

[0006] To address the above problems, this utility model provides a waste heat utilization structure for tunnel furnace flue gas, which improves waste heat utilization efficiency, increases flue gas flow, and prevents flue gas leakage.

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution: A waste heat utilization structure for flue gas exhaust in a tunnel furnace includes multiple exhaust pipes connected inside the tunnel furnace. Each exhaust pipe has a bend at its top, and an outer sleeve connects two adjacent bends. A circulation pipe is fitted inside the outer sleeve, and both ends of the circulation pipe extend out of the outer sleeve. End caps are connected between the two ends of the outer sleeve and the circulation pipe. An exhaust pipe is connected to the middle of the outer sleeve, and a flue gas filter is connected to the exhaust pipe. The circulation pipe is bent multiple times inside the outer sleeve. The exhaust pipe is connected to an upper connecting plate and a lower connecting plate. A switching plate is slidably connected between the upper connecting plate and the lower connecting plate. The switching plate is provided with a blocking part and a connecting part. A baffle strip located on both sides of the switching plate is connected between the upper connecting plate and the lower connecting plate. The switching plate is externally connected to a driving structure.

[0008] Preferably, in order to increase the speed of flue gas exhaust, a fan is provided on one side of the flue gas exhaust pipe. The fan is connected to the top of the tunnel furnace, and the air outlet of the fan is connected to an air outlet pipe located inside the flue gas exhaust pipe. The air outlet of the air outlet pipe is bent upward.

[0009] Preferably, in order to facilitate the control of the switching plate, a cylinder is provided on the side of the flue pipe away from the fan. The cylinder is connected to the top of the tunnel furnace, and a push rod is connected between the extended end of the cylinder and the switching plate. The cylinder and the fan are connected by an electrical signal.

[0010] Preferably, in order to prevent flue gas from leaking from the fan, a one-way cover is provided inside the air outlet pipe to prevent gas backflow.

[0011] Preferably, in order to increase the residence time of the liquid in the circulation tube, the circulation tube is spirally arranged inside the outer tube.

[0012] Preferably, in order to improve the stability of the lower connecting plate, a mounting plate is connected to the bottom of the lower connecting plate, and the mounting plate is connected to the top of the tunnel furnace.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This device has bends and outer sleeves at the top of multiple exhaust pipes, which can wrap around the circulation pipes, allowing the high-temperature flue gas to flow along the outside of the circulation pipes, increasing the heat exchange area with the circulation pipes and improving the heat exchange effect. At the same time, the bends in the circulation pipes can increase the residence time of the liquid in the circulation pipes, further improving the heat exchange effect and avoiding poor waste heat utilization.

[0014] 2. This device has a fan component installed on one side of the exhaust pipe, which can promote the flow of flue gas when the airflow is too slow, thereby improving the flow effect of flue gas. At the same time, the one-way cover plate installed inside the fan can prevent the flue gas from leaking into the outer casing, thus improving the sealing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the outer sleeve and the bent pipe structure in this utility model; Figure 2 This is a schematic diagram of the exhaust pipe and bend structure in this utility model; Figure 3 This utility model Figure 2Enlarged view of section AA; Figure 4 This is a schematic diagram of the switching plate and lower connecting plate structure in this utility model; Figure 5 This is a schematic diagram of the circulation pipe and end cap structure in this utility model.

[0016] Figure label: 101. Exhaust pipe; 102. Bend; 103. Outer sleeve; 104. Circulation pipe; 105. End cap; 106. Air outlet pipe; 107. Upper connecting plate; 108. Lower connecting plate; 109. Switching plate; 110. Sealing part; 111. Connecting part; 112. Baffle bar; 113. Fan; 114. Air outlet pipe; 115. Cylinder; 116. Push rod; 117. One-way cover plate; 118. Mounting plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In this case, the selection of materials, heat treatment processes, and structural dimensions of conventional and critical load-bearing components all conform to standards. The existing material properties are all suitable for use under this condition, ensuring sufficient strength, stiffness, and fatigue resistance under rated load and expected operating conditions, such as springs. These are all conventional design considerations well known to those skilled in the art.

[0019] Please see Figure 1-5A waste heat recovery structure for flue gas exhaust in a tunnel furnace includes multiple exhaust pipes 101 connected to the tunnel furnace and communicating with the combustion chamber within the furnace. Each exhaust pipe 101 has a bend 102 connected to its top. An outer sleeve 103 connects adjacent bends 102, and a circulation pipe 104 is fitted inside the outer sleeve 103. Liquid flows within the circulation pipe 104 for waste heat recovery. The outer sleeve 103 extends from both ends of the circulation pipe 104, and end caps 105 connect the two ends of the outer sleeve 103 to the circulation pipe 104. A sealed space is formed between the bends 102, the outer sleeve 103, and the end caps 105, preventing flue gas leakage. Simultaneously, the flue gas accumulated in the sealed space increases its contact time with the circulation pipe 104, thereby improving heat exchange efficiency. An exhaust pipe 106 is connected to the middle of the outer sleeve 103. The exhaust pipe 106 is used to discharge the gas after heat exchange. The exhaust pipe 106 is externally connected to a flue gas filter. The circulation pipe 104 is arranged with multiple bends inside the outer sleeve 103, as shown in the reference section. Figure 5 This is used to increase the residence time of the circulation pipe 104 and increase the heat exchange time with the flue gas; An upper connecting plate 107 and a lower connecting plate 108 are connected to the exhaust pipe 101. A switching plate 109 is slidably connected between the upper connecting plate 107 and the lower connecting plate 108. The switching plate 109 is used to control the airflow connection state. The switching plate 109 is provided with a blocking part 110 and a connecting part 111. When the blocking part 110 of the switching plate 109 corresponds to the exhaust pipe 101, it blocks the airflow channel to prevent the airflow from passing through. When the connecting part 111 of the switching plate 109 corresponds to the exhaust pipe 101, the airflow channel is in a connected state, and the flue gas can pass through smoothly. Baffles 112 located on both sides of the switching plate 109 are connected between the upper connecting plate 107 and the lower connecting plate 108. The baffles 112 on both sides guide the switching plate 109. The switching plate 109 is externally driven by a drive structure to control the position of the switching plate 109.

[0020] In one embodiment, the outer casing 103 extends to one end, with the extended end located in the water inlet direction of the circulation pipe 104. Simultaneously, the vent pipe 106 on the outer casing 103 is also located on the outer casing 103, near the water inlet end of the circulation pipe 104. The flue gas entering the outer casing 103 through the exhaust pipe 101 exchanges heat with the circulation pipe 104, causing its temperature to gradually decrease, while the temperature of the liquid inside the pipe gradually increases. The temperature of the liquid near the water inlet end of the circulation pipe 104 is lower than that at the water outlet end. As the flue gas gradually moves towards the water inlet end, it preheats the liquid inside the circulation pipe 104 when it reaches the side near the water inlet end, thus improving the utilization of waste heat.

[0021] Specifically, to increase the speed of flue gas exhaust, a fan 113 is installed on one side of the flue gas exhaust pipe 101, with multiple fans 113 arranged in a row. The fan 113 is connected to the top of the tunnel furnace, and the air outlet of the fan 113 is connected to an air outlet pipe 114 located inside the flue gas exhaust pipe 101. The air outlet of the air outlet pipe 114 is bent upward, and the blown airflow moves upward. According to Bernoulli's principle, a negative pressure is generated at the top of the pipe, thereby promoting the flow of gas inside the tunnel furnace.

[0022] In one embodiment, the circulation pipe 104 is equipped with a switch structure and a temperature detection structure at both ends, and the outlet end is connected to a water storage tank. When the temperature of the liquid in the circulation pipe 104 reaches the set point, the switch structure at both ends opens, storing the liquid in the water storage tank. When the liquid inside is replaced with new liquid, the switch structure closes, and the new liquid is heated. The liquid is heated gradually.

[0023] Specifically, to facilitate control of the switching plate 109, a cylinder 115 is provided on the side of the exhaust pipe 101 away from the fan 113. The cylinder 115 is connected to the top of the tunnel furnace. A push rod 116 is connected between the extended end of the cylinder 115 and the switching plate 109. A sliding frame is connected to the top of the tunnel furnace to restrict the push rod 116. The cylinder 115 and the fan 113 are connected by an electrical signal. When the cylinder 115 extends, the connecting part 111 on the switching plate 109 corresponds to the exhaust pipe 101, and at the same time, the fan 113 is controlled to operate. When the cylinder 115 retracts, it blocks the airflow, and at the same time, the fan 113 is controlled to stop.

[0024] In one embodiment, the fan 113 and the cylinder 115 are controlled separately, and the fan 113 is only started when it is necessary to increase the flow rate of gas in the exhaust pipe 101.

[0025] Specifically, in order to prevent the smoke from leaking from the fan 113, a one-way cover 117 is provided inside the air outlet pipe 114 to prevent backflow of gas. The one-way cover 117 can only be opened towards the air outlet end.

[0026] Specifically, in order to increase the residence time of the liquid in the circulation pipe 104, the circulation pipe 104 is spirally arranged inside the outer sleeve 103. A schematic diagram of the spiral arrangement is not shown. By using the spiral arrangement, the residence time of the liquid in the circulation pipe 104 can be increased, thereby improving the heat exchange efficiency.

[0027] Specifically, in order to improve the stability of the lower connecting plate 108, an mounting plate 118 is connected to the bottom of the lower connecting plate 108 to facilitate installation. The mounting plate 118 is connected to the top of the tunnel furnace.

[0028] In this embodiment, the fluid to be heated flows inside the circulation pipe 104. The exhaust pipe 101 is connected to the combustion chamber inside the tunnel furnace. The bend 102 is connected to the top of the exhaust pipe 101. The flue gas exiting the exhaust pipe 101 flows inside the outer casing 103, heating the liquid inside the circulation pipe 104 through heat exchange, thus improving the utilization of waste heat. When the flow of flue gas in the exhaust pipe 101 is too slow, the fan 113 is activated. The airflow blown by the fan 113 propels the flow of flue gas inside the outer casing 103. The flue gas after heat exchange is discharged from the exhaust pipe 106.

[0029] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A waste heat utilization structure for flue gas exhaust in a tunnel furnace, comprising multiple exhaust pipes (101) connected within the tunnel furnace, characterized in that: The top of each of the multiple exhaust pipes (101) is connected to a bend (102), and an outer sleeve (103) is connected between two adjacent bends (102). A circulation pipe (104) is fitted inside the outer sleeve (103). The two ends of the circulation pipe (104) extend out of the outer sleeve (103). End caps (105) are connected between the two ends of the outer sleeve (103) and the circulation pipe (104). An exhaust pipe (106) is connected to the middle of the outer sleeve (103). The exhaust pipe (106) is connected to a flue gas filter. The circulation pipe (104) is bent multiple times inside the outer sleeve (103). The exhaust pipe (101) is connected to an upper connecting plate (107) and a lower connecting plate (108). A switching plate (109) is slidably connected between the upper connecting plate (107) and the lower connecting plate (108). The switching plate (109) is provided with a blocking part (110) and a connecting part (111). A baffle (112) located on both sides of the switching plate (109) is connected between the upper connecting plate (107) and the lower connecting plate (108). The switching plate (109) is externally connected to a driving structure.

2. The waste heat utilization structure for tunnel furnace flue gas according to claim 1, characterized in that: A fan (113) is provided on one side of the flue pipe (101). The fan (113) is connected to the top of the tunnel furnace. The air outlet of the fan (113) is connected to an air outlet pipe (114) located inside the flue pipe (101). The air outlet of the air outlet pipe (114) is bent upward.

3. The waste heat utilization structure for tunnel furnace flue gas according to claim 2, characterized in that: A cylinder (115) is provided on the side of the exhaust pipe (101) away from the fan (113). The cylinder (115) is connected to the top of the tunnel furnace. A push rod (116) is connected between the extended end of the cylinder (115) and the switching plate (109). The cylinder (115) and the fan (113) are connected by an electrical signal.

4. The waste heat utilization structure for tunnel furnace flue gas according to claim 3, characterized in that: The air outlet pipe (114) is equipped with a one-way cover plate (117) to prevent gas backflow.

5. The waste heat utilization structure for tunnel furnace flue gas according to claim 4, characterized in that: The circulation tube (104) is spirally arranged inside the outer tube (103).

6. The waste heat utilization structure for tunnel furnace flue gas according to claim 5, characterized in that: The bottom of the lower connecting plate (108) is connected to an mounting plate (118), which is connected to the top of the tunnel furnace.

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