Immersed heat exchange device for waste heat of kiln

Abstract

The utility model relates to the technical field of heat exchange equipment, and discloses a kiln waste heat immersed heat exchange device which comprises a first water tank, a second water tank, a third water tank, a first heat source pipe, a second heat source pipe and heat exchange terminal equipment. A splitter plate immersed in liquid in the first water tank is arranged at the outlet end of the first heat source pipe, and first filter holes are formed in the splitter plate; a baffle plate is vertically arranged in the second water tank and divides the second water tank into a water inlet cavity and a water outlet cavity, and the water inlet cavity is communicated with the water outlet cavity; the first water tank communicates with the third water tank and the outside, the bottom of the first water tank communicates with the bottom of the water inlet cavity, and the heat exchange terminal equipment communicates with the water outlet cavity. According to the immersed heat exchange device for the waste heat of the kiln, the utilization efficiency and the safety of the waste heat of the kiln can be improved, and the heat exchange effect is stabilized.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, and in particular to a kiln waste heat immersion heat exchange device. Background Technology

[0002] In building ceramic kilns, there are already many solutions for utilizing waste heat, such as using the cooled waste heat to heat the combustion air or to heat the drying kiln. These solutions help to use energy more efficiently and save energy.

[0003] However, some waste heat utilization solutions still have problems such as unstable heat exchange effect and potential safety hazards.

[0004] For example, existing technologies, in order to reduce the energy consumption of raw material granulation, apply waste heat to the raw material production process of atomizing and heating mud into granules. Specifically, cold water is sent to the kiln cooling section for heating, and then the high-temperature hot water is directly sent to the heat exchange terminal equipment. This heat exchange method is not easy to control the hot water temperature. Since the hot water heat exchange area is fixed and the high-temperature heat source is also fixed, when the water volume is large, the water temperature will decrease; when the water volume is small, the water temperature will increase, and it is easy to generate high-temperature and high-pressure steam, which affects both the safety of the pipeline and the heat exchange effect of the heat exchange terminal equipment. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a kiln waste heat immersion heat exchange device to improve the utilization efficiency and safety of kiln waste heat utilization and stabilize the heat exchange effect.

[0006] To solve the above-mentioned technical problems, this utility model provides a kiln waste heat immersion heat exchange device, including a first water tank, a second water tank, a third water tank, a first heat source pipe, a second heat source pipe, and heat exchange terminal equipment.

[0007] The first heat source pipe is used to transport kiln hot air to the first water tank. The outlet end of the first heat source pipe is provided with a diversion plate immersed in the liquid in the first water tank. The diversion plate is provided with a plurality of first filter holes arranged circumferentially along the outlet of the first heat source pipe.

[0008] The second water tank is equipped with a vertically arranged baffle plate, which divides the second water tank into an inlet chamber and an outlet chamber, and the inlet chamber and the outlet chamber are connected.

[0009] The first water tank is connected to the third water tank, the first water tank is connected to the outside, the bottom of the first water tank is connected to the bottom of the water inlet chamber, and the water inlet of the heat exchange terminal equipment is connected to the water outlet chamber through the second heat source pipe.

[0010] As an improvement to the above solution, the upper part of the baffle plate is provided with a second filter hole, which connects the water inlet chamber and the water outlet chamber.

[0011] As an improvement to the above solution, the second water tank is provided with an inlet connected to the first water tank and an outlet connected to the second heat source pipe. The baffle plate includes a sealing section and a filtering section. The filtering section is located above the sealing section. The second filter hole is located in the filtering section. The inlet and the outlet are both located below the filtering section.

[0012] As an improvement to the above solution, the center of the flow divider plate is provided with a through hole communicating with the first heat source pipe. The flow divider plate is provided with multiple array layers formed by the first filter holes. Each array layer is arranged around the through hole, and each array layer is provided with at least two rows of arrays. The diameter of the first filter hole of the array layer from the center of the flow divider plate to the edge gradually increases, and the number of arrays of the array layer from the center of the flow divider plate to the edge gradually increases.

[0013] As an improvement to the above solution, the first water tank or the second water tank is equipped with a temperature sensor for monitoring the temperature of the liquid inside the tank, and an electric actuator is provided on the first heat source pipe. The temperature sensor and the electric actuator are both connected to the first controller.

[0014] As an improvement to the above solution, a second water pump is provided on the second heat source pipe, and the second water pump and the heat exchange terminal equipment are both connected to the second controller.

[0015] As an improvement to the above solution, the first water tank and the second water tank keep the liquid levels flush. The second water tank is equipped with a first water level sensor. The third water tank supplies cold water to the first water tank through a first cold water pipe. The first cold water pipe is equipped with a first water pump. The first water pump and the first water level sensor are both connected to the third controller.

[0016] As an improvement to the above solution, a second cold water pipe is also included, through which the outlet of the heat exchange terminal equipment is connected to the third water tank.

[0017] As an improvement to the above solution, the third water tank is also equipped with a third cold water pipe and a second water level sensor. The third cold water pipe is connected to an external water source and is equipped with a solenoid valve. The solenoid valve and the second water level sensor are both connected to the fourth controller.

[0018] As an improvement to the above solution, the bottom of the first water tank, the second water tank, and the third water tank are all equipped with drain valves;

[0019] The second water tank has a drain outlet inside the water inlet chamber, and the drain valve of the second water tank is located below the drain outlet.

[0020] Implementing this utility model has the following beneficial effects:

[0021] This utility model discloses a kiln waste heat immersion heat exchange device, which uses the waste heat of the roller kiln cooling section for slurry heat exchange equipment, thereby helping to improve the utilization efficiency of kiln waste heat.

[0022] By setting a diversion plate at the outlet end of the first heat source pipe, the diversion plate is immersed in the liquid in the first water tank. The first heat source pipe transports the kiln hot air to the first water tank. Under the action of the diversion plate, the hot air and the liquid in the first water tank directly convect and exchange heat, resulting in high heat exchange efficiency. The generated high-temperature bubbles rise to the surface and are broken into countless small bubbles by the first filter holes of the diversion plate, which increases the heat exchange area and improves the heat exchange efficiency.

[0023] After heat exchange, the liquid enters the inlet chamber of the second water tank from the bottom of the first water tank. Due to the obstruction of the baffle plate, a small number of residual air bubbles in the liquid float to the top of the inlet chamber and do not flow downward with the liquid in the outlet chamber. Instead, they enter the second heat source pipe and the heat exchange terminal equipment from the bottom of the outlet chamber. This achieves gas-liquid separation before the hot water enters the second heat source pipe, preventing air bubbles from entering the heat exchange terminal equipment and affecting the stability and safety of the heat exchange effect.

[0024] By controlling the hot air flow rate of the electric actuator and the hot water flow rate of the second water pump based on the heat demand fed back from the heat exchange terminal equipment and the hot water temperature measured by the temperature sensor, the control system can regulate the hot water temperature and flow rate sent to the heat exchange terminal equipment, ensuring stable heat exchange. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an embodiment of the waste heat immersion heat exchange device for kilns according to this utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the structure of the second water tank in the middle;

[0027] Figure 3 This is a schematic diagram of the first structure of the flow divider;

[0028] Figure 4 This is a schematic diagram of the second structure of the flow divider;

[0029] Figure 5 This is a schematic diagram of the baffle plate structure. Detailed Implementation

[0030] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0031] Figures 1 to 5As shown, this utility model discloses an embodiment of a kiln waste heat immersion heat exchange device, including a first water tank 1, a second water tank 2, a third water tank 3, a first heat source pipe 4, a second heat source pipe 5, a first cold water pipe 6, a heat exchange terminal device 7, and a control system. The first heat source pipe 4 is used to transport kiln hot air to the first water tank 1. The outlet end of the first heat source pipe 4 is provided with a diversion plate 41 immersed in the liquid in the first water tank 1. The diversion plate 41 is provided with a plurality of first filter holes 411 arranged circumferentially along the outlet of the first heat source pipe 4. The second water tank 2 is provided with a vertically arranged baffle plate 21, which divides the second water tank 2 into an inlet chamber a and an outlet chamber b, the tops of which are connected. The first water tank 1 is connected to the third water tank 3 through the first cold water pipe 6, which is used to transfer the waste heat from the third water tank 3 to the third water tank 3. Cold water from tank 3 is introduced into the first water tank 1. The top of the first water tank 1 is connected to the outside, and the bottom of the first water tank 1 is connected to the bottom of the inlet chamber a. The inlet end of the heat exchange terminal device 7 is connected to the bottom of the outlet chamber b through the second heat source pipe 5. The first water tank 1 or the second water tank 2 is equipped with a temperature sensor 11 for monitoring the temperature of the liquid inside the tank. The first heat source pipe 4 is equipped with an electric actuator 42, and the second heat source pipe 5 is equipped with a second water pump 51. The control system is connected to the temperature sensor 11, the electric actuator 42, the second water pump 51, and the heat exchange terminal device 7.

[0032] In this embodiment, a diversion plate 41 is installed at the outlet end of the first heat source pipe 4. The diversion plate 41 is immersed in the liquid in the first water tank 1. The first heat source pipe 4 transports the kiln hot air to the first water tank 1. Under the action of the diversion plate 41, the hot air and the liquid in the first water tank 1 directly convect and exchange heat, resulting in high heat exchange efficiency. The generated high-temperature bubbles rise to the surface and are broken into numerous small bubbles by the first filter holes 411 of the diversion plate 41, increasing the heat exchange area and improving the heat exchange efficiency. The heat-exchanged liquid enters the inlet chamber a of the second water tank 2 from the bottom of the first water tank 1. Under the obstruction of the baffle plate 21, a small amount of residual liquid is removed. The air bubbles float on the surface of the inlet chamber a and do not flow downwards with the liquid in the outlet chamber b. Instead, they enter the second heat source pipe 5 and the heat exchange terminal device 7 from the bottom of the outlet chamber b. This achieves gas-liquid separation before the hot water enters the second heat source pipe 5, preventing air bubbles from entering the heat exchange terminal device 7 and affecting the stability and safety of the heat exchange effect. Based on the heat demand fed back by the heat exchange terminal device 7 and the hot water temperature measured by the temperature sensor 11, the control system controls the hot air flow rate of the electric actuator 42 and the hot water flow rate of the second water pump 51. This allows for the regulation of the hot water temperature and flow rate sent to the heat exchange terminal device 7, ensuring stable heat exchange.

[0033] Since kilns are high-energy-consuming and high-carbon-emission equipment, in response to the national dual-carbon strategy, most of the waste heat in building ceramic kilns has been utilized in the processes before and after the kiln. However, a significant amount of waste heat in the kiln cooling section remains unused. Therefore, in this embodiment, the kiln hot air transported by the first heat source pipe 4 is the waste heat from the roller kiln cooling section, i.e., the hot air formed after cooling the kiln. It is clean, high-temperature air. This waste heat is used in the slurry heat exchange equipment to further improve the utilization efficiency of the kiln waste heat.

[0034] The second heat source pipe 5 provides a heat source to the heat exchange terminal equipment 7. In this embodiment, the heat exchange terminal equipment 7 is a mud heat exchange equipment used in the mud atomization heating and granulation process. The second heat source pipe 5 delivers hot water with controllable temperature and flow rate to the mud heat exchange equipment to ensure the stable operation of the mud heat exchange equipment.

[0035] See Figure 3 In this embodiment, a through-hole 412 communicating with the first heat source pipe 4 is provided on the diversion plate 41 inside the first water tank 1. The high-temperature air from the first heat source pipe 4 flows downward into the liquid in the first water tank 1 through the through-hole 412 of the diversion plate 41, directly exchanging heat through convective contact. The first heat source pipe 4 enters vertically from the top center of the first water tank 1 to ensure uniform heat exchange in all directions around the first heat source pipe 4. Since the high-temperature air transported by the first heat source pipe 4 is immersed in the liquid in the first water tank 1, a large number of bubbles will be generated. Therefore, in this embodiment, the diversion plate 41 is preferably horizontally arranged and covers the entire first water tank 1 as much as possible. See also Figure 4 The flow divider 41 is provided with multiple array layers formed by the first filter holes 411. Specifically, it includes a first array layer d, a second array layer e, a third array layer f, and a fourth array layer g arranged sequentially from the center to the edge of the flow divider 41. Each array layer is arranged around the through hole 412, and each array layer has at least two rows of arrays. The diameter of the first filter holes 411 of the array layers from the center to the edge of the flow divider 41 gradually increases, and the number of arrays of the array layers from the center to the edge of the flow divider 41 gradually increases, so as to divert hot water or steam as much as possible, break up large bubbles, and form countless small bubbles, thereby increasing the heat exchange area and improving the heat exchange efficiency.

[0036] The top of the first water tank 1 is also equipped with an exhaust pipe 12, through which the low-temperature gas that has completed heat exchange with the liquid in the first water tank 1 will be discharged.

[0037] In this embodiment, the second water tank 2 has an inlet in the inlet chamber a that communicates with the first water tank 1, and an outlet in the outlet chamber b that communicates with the second heat source pipe 5. Both the inlet and outlet are located at the lower part of the second water tank 2.

[0038] In this embodiment, the lower parts of the first water tank 1 and the second water tank 2 are connected, forming a structure similar to a communicating vessel, so as to keep the liquid levels of the first water tank 1 and the second water tank 2 at the same level during the immersion heat exchange process. At the same time, in this embodiment, a first water level sensor 22 is installed in the second water tank 2, and a first water pump 61 is installed on the first cold water pipe 6. The control system is connected to the first water pump 61 and the first water level sensor 22. The first water pump 61 replenishes water to the first water tank 1 in a timely manner according to the water level changes detected by the first water level sensor 22, so as to maintain a certain water level in the first water tank 1 and the second water tank 2 and ensure a stable supply of hot water to the heat exchange terminal equipment 7. In this embodiment, the first water tank 1 and the second water tank 2 are connected by a horizontally arranged connecting pipe 23. The water level fluctuation is small, so only one first water level sensor 22 is needed to measure the real-time water level of the first water tank 1 and the second water tank 2, ensuring a stable supply of hot water from the first water tank 1 and the second water tank 2. At the same time, placing the first water level sensor 22 in the second water tank 2 avoids the influence of a large number of bubbles generated by water-air heat exchange in the first water tank 1 on the accuracy of water level monitoring, making the equipment operation more stable and reliable.

[0039] See Figure 5 Preferably, the upper part of the baffle plate 21 is provided with a second filter hole c, which connects the water inlet chamber a and the water outlet chamber b. The second filter hole c can help to further prevent air bubbles from entering the water outlet chamber b, and can also filter some impurities.

[0040] Specifically, the baffle plate 21 includes a sealing section 211 and a filtering section 212. The filtering section 212 is located above the sealing section 211, and the second filter hole c is located in the filtering section 212. The inlet and outlet are both located below the filtering section 212. In the second water tank 2, the hot water entering the inlet chamber a flows from the bottom upwards, enters the outlet chamber b, and then flows downwards from the top. During this process, if the hot water in the inlet chamber a contains air bubbles, they will be separated from the hot water to ensure that the hot water entering the mud heat exchanger from the outlet chamber b is free of air bubbles, thus avoiding affecting the heat exchange effect of the mud heat exchanger.

[0041] In this embodiment, the first water level sensor 22 is used to monitor the water level in the outlet chamber b. The first water level sensor 22 is preferably located at the top of the outlet chamber b, and the diverter plate 41 is preferably located below the filtration section 212. Cold water from the third water tank 3 is introduced into the first water tank 1. When the water level in the first water tank 1 reaches the position of the connecting pipe 23, the water level in the first water tank 1 is flush with the inlet chamber a of the second water tank 2. When the water level in the inlet chamber a reaches the top of the sealing section 211, the water level in the first water tank 1 is flush with both the inlet chamber a and the outlet chamber b of the second water tank 2. In this embodiment, the diverter plate 41 is located below the filtration section 212, and the first water level sensor 22 monitors the water level in the outlet chamber b in real time. When the first water level sensor 22 detects the water level in the outlet chamber b, it ensures that the diverter plate 41 at the outlet end of the first heat source pipe 4 is submerged below the liquid surface of the first water tank 1. The placement of the first water level sensor 22 and the diversion plate 41 can reduce the detection accuracy requirements of the first water level sensor 22. As long as liquid is detected entering the outlet chamber b, the current water level in the first water tank 1 can be determined so that the diversion plate 41 is submerged below the liquid surface, thereby improving the reliability of the submersion heat exchange.

[0042] The bottom of the first water tank 1 is equipped with a first drain valve 13, the bottom of the second water tank 2 is equipped with a second drain valve 24, and the bottom of the third water tank 3 is equipped with a third drain valve 31. The second water tank 2 has a drain outlet in its inlet chamber a, and the second drain valve 24 is located below the drain outlet. The sealing section 211 of the baffle plate 21 acts as a trap on one side of the inlet chamber a, preventing sediment and other contaminants from entering the second heat source pipe 5 and the mud heat exchange equipment.

[0043] The control system in this embodiment preferably uses PLC control and is a closed-loop control to reduce manual operation. Specifically, the temperature sensor 11 in this embodiment is preferably a thermocouple, which is installed in the first water tank 1 near the connecting pipe 23. The temperature sensor 11 and the electric actuator 42 on the first heat source pipe 4 are both connected to the first PLC controller 81; the heat exchange terminal equipment 7 and the second water pump 51 on the second heat source pipe 5 are both connected to the second PLC controller 82; the first water level sensor 22 and the first water pump 61 on the first cold water pipe 6 are both connected to the third PLC controller 83.

[0044] In this embodiment, the outlet of the heat exchange terminal device 7 is connected to the third water tank 3 via a second cold water pipe 9. The second cold water pipe 9 serves as a cold water return system, while the third water tank 3 serves as a circulating water storage and supply system. Water that has undergone heat exchange in the heat exchange terminal device 7 returns to the third water tank 3 via the second cold water pipe 9, and is then supplied to the first water tank 1 for water-air heat exchange. Furthermore, the third water tank 3 is equipped with a third cold water pipe 32 and a second water level sensor 33. The third cold water pipe 32 is connected to an external water source and is equipped with a solenoid valve 321. Both the second water level sensor 33 and the solenoid valve 321 are connected to the fourth PLC controller 84. Cold water from the mud heat exchange device returns to the circulating water tank via the second cold water pipe 9. The second water level sensor 33 continuously monitors the water level in the third water tank 3. If the water level in the third water tank 3 is insufficient, the fourth PLC controller 84 controls the solenoid valve to open the third cold water pipe 32, thereby replenishing the water level.

[0045] This utility model also provides an operation process for the above-mentioned kiln waste heat immersion heat exchanger as follows:

[0046] First, cold water from the third water tank 3 is introduced into the first water tank 1, so that the diverter plate 41 at the outlet end of the first heat source pipe 4 is submerged below the liquid surface of the first water tank 1. The liquid surface of the inlet chamber a and the outlet chamber b of the second water tank 2 are flush with the liquid surface in the first water tank 1 and reach the preset water level. Then, kiln hot air is introduced into the first water tank 1 through the first heat source pipe 4 until the liquid in the first water tank 1 reaches the preset temperature. Finally, the liquid in the outlet chamber b of the second water tank 2 is introduced into the inlet end of the heat exchange terminal equipment 7 through the second heat source pipe 5 for heat exchange.

[0047] The outlet of the heat exchange terminal device 7 is connected to the third water tank 3 through the second cold water pipe 9. The water that has completed heat exchange through the heat exchange terminal device 7 returns to the third water tank 3 through the second cold water pipe 9, and is then supplied to the first water tank 1 for heat exchange, forming a circulation of the heat exchange medium.

[0048] The temperature sensor 11 installed in the first water tank 1 is used to monitor the temperature of the liquid inside the tank. The electric actuator 42 installed on the first heat source pipe 4 is used to adjust the flow rate of the first heat source pipe 4. Both the temperature sensor 11 and the electric actuator 42 are connected to the first PLC controller 81 to realize the adjustment of the hot water temperature inside the tank.

[0049] The second water pump 51 installed in the second heat source pipe 5 is used to regulate the flow rate of hot water sent to the heat exchange terminal equipment 7. The second heat source pipe 5, the heat exchange terminal equipment 7 and the second PLC controller 82 are connected to meet the heat demand of the mud heat exchange equipment.

[0050] This invention utilizes the waste heat (high-temperature air) of the kiln cooling section. The high-temperature air is introduced into the first water tank 1 through the first heat source pipe 4. The air is then broken up by the diversion plate 41 to exchange heat with the liquid in the first water tank 1. The liquid after heat exchange then passes through the baffle plate 21 of the second water tank 2 to further reduce the gas, and finally is sent to the heat exchange terminal equipment 7 to increase the temperature of the mud processing. The temperature and flow rate of the liquid sent to the heat exchange terminal equipment 7 are controlled by PLC. The circulating water passing through the heat exchange terminal equipment 7 enters the third water tank 3 and is supplied to the submerged first water tank 1 to form a cycle.

[0051] In summary, implementing this utility model has the following beneficial effects:

[0052] 1. The temperature and flow rate of the hot water leading to the heat exchange terminal equipment 7 are controllable, which can ensure the stability of heat exchange in the heat exchange terminal equipment 7;

[0053] 2. The first water tank 1 adopts an immersion heat exchange method, which allows the first heat source pipe 4 and the hot air it transports to directly contact the water for heat exchange, resulting in high heat exchange efficiency.

[0054] 3. The first water tank 1 is equipped with a flow divider 41, which can break up air bubbles, increase the heat exchange area between high-temperature steam and water, and improve heat exchange efficiency.

[0055] 4. The baffle plate 21 installed in the second water tank 2 can prevent residual air in the first water tank 1 from entering the heat exchange terminal equipment 7, thus avoiding affecting the efficiency of the heat exchange terminal equipment 7.

[0056] 5. The entire system is controlled by PLC and is a closed-loop control system with a high degree of automation.

[0057] The above-disclosed embodiment is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A submerged heat exchanger for recovering waste heat from a furnace, characterized by, The first water tank, the second water tank, the third water tank, the first heat source pipe, the second heat source pipe and the heat exchange terminal device, The first heat source pipe is used for conveying kiln hot gas to the first water tank, and an outlet end of the first heat source pipe is provided with a flow dividing plate immersed in liquid in the first water tank, and a plurality of first filter holes are arranged on the flow dividing plate in a circumferential direction of the first heat source pipe; The second water tank is provided with a baffle plate arranged vertically, and the baffle plate divides the second water tank into a water inlet cavity and a water outlet cavity, and the water inlet cavity and the water outlet cavity are communicated; The first water tank is communicated with the third water tank, the first water tank is communicated with the outside, the bottom of the first water tank is communicated with the bottom of the water inlet cavity, and the water inlet end of the heat exchange terminal device is communicated with the water outlet cavity through the second heat source pipe.

2. The submerged heat exchanger for recovering waste heat from a furnace as claimed in claim 1 wherein, The upper part of the baffle plate is provided with a second filter hole, and the second filter hole communicates the water inlet cavity and the water outlet cavity.

3. The submerged heat exchanger for recovering waste heat from a furnace as claimed in claim 2 wherein, The second water tank is provided with a water inlet communicated with the first water tank and a water outlet communicated with the second heat source pipe, the baffle plate comprises a water sealing section and a water filtering section, the water filtering section is arranged above the water sealing section, the second filter hole is arranged on the water filtering section, and the water inlet and the water outlet are arranged below the water filtering section.

4. The waste heat submerged heat exchanger of a furnace according to claim 1, wherein The center of the flow dividing plate is provided with a through hole communicated with the first heat source pipe, a plurality of array layers formed by the first filter holes are arranged on the flow dividing plate, each array layer is arranged around the through hole, each array layer is provided with at least two rows of arrays, the diameter of the first filter hole of the array layer gradually increases from the center to the edge of the flow dividing plate, and the number of arrays of the array layer gradually increases from the center to the edge of the flow dividing plate.

5. The waste heat submerged heat exchanger of a furnace as claimed in claim 1, wherein, The first water tank or the second water tank is provided with a temperature sensor for monitoring the temperature of liquid in the tank, and the first heat source pipe is provided with an electric actuator, and the temperature sensor and the electric actuator are connected with a first controller.

6. The waste heat submerged heat exchanger of a furnace as claimed in claim 1, wherein, A second water pump is arranged on the second heat source pipe, and the second water pump and the heat exchange terminal device are connected with a second controller.

7. The waste heat submerged heat exchanger of a furnace as claimed in claim 2, wherein The first water tank and the second water tank keep the liquid level flush, the second water tank is provided with a first water level sensor, the third water tank is provided with a first cold water pipe for conveying cold water into the first water tank, a first water pump is arranged on the first cold water pipe, and the first water pump and the first water level sensor are connected with a third controller.

8. The waste heat submerged heat exchanger of a furnace as claimed in claim 1, wherein, A second cold water pipe is further arranged, and the water outlet of the heat exchange terminal device is communicated with the third water tank through the second cold water pipe.

9. The waste heat submerged heat exchanger of claim 1, wherein A third cold water pipe and a second water level sensor are further arranged on the third water tank, the third cold water pipe is communicated with an external water source, an electromagnetic valve is arranged on the third cold water pipe, and the electromagnetic valve and the second water level sensor are connected with a fourth controller.

10. The waste heat submerged heat exchanger of claim 1, wherein The bottom of the first water tank, the second water tank and the third water tank is provided with a sewage valve. The second water tank is provided with a sewage outlet in the water inlet cavity, and the sewage valve of the second water tank is arranged below the sewage outlet.

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