A double-circulation embedded layered heat exchanger

Abstract

The present invention proposes a double-circulation embedded stratified heat exchanger, which includes a vertical heat exchange tube, a sealing plate and a first and a second inlet and outlet tubes at both ends, and a fluid tube inside the tube. The heat exchange tube is fixed on a vertical barrel body, and one end of the second inlet and outlet tube and the first inlet tube are connected to one end of the heat exchange tube and extend outside the barrel. Water outlets one and two are arranged at the lower end of the barrel, and water inlet one is arranged at the upper end. An external circulation water pump is connected to water outlet one and water inlet one, and an internal circulation water pump is connected to water outlet two and the first inlet tube. The barrel body is divided into evaporation and heat exchange chambers, the heat exchange tube is in the heat exchange chamber, the second inlet tube is in the evaporation chamber, and the side wall of the evaporation chamber has a steam outlet. There are also pressure relief ports, drain ports, and emergency water replenishment ports on the barrel. There are steam-water separation structural components and water level monitoring devices in the evaporation chamber. There is a heat absorption chamber between the two chambers, and a heat absorption component is arranged in the heat absorption chamber at the upper end. This design improves the heat exchange efficiency through a unique structure.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a double-circulation embedded stratified heat exchanger. Background Art

[0002] In the field of industrial production, the heat exchange process is of vital importance, and tubular heat exchangers, as a widely used heat exchange equipment, play a key role.

[0003] Its structure has multiple core components. The shell is mostly circular and made of metal materials such as carbon steel and stainless steel. It aims to create a flow place for the shell-side fluid, rely on the metal's own characteristics to ensure strength, resist corrosion, and ensure long-term and stable operation of the equipment. As the key to heat transfer, the tube bundle is composed of many parallel metal tubes. The tube-side fluid shuttles through the tubes and exchanges heat with the shell-side fluid through tubes. The tube sheet firmly fixes both ends of the tube bundle and accurately positions the tube bundle in the shell. At the same time, it acts as a "barrier" to effectively isolate the tube-side and shell-side fluids to eliminate the risk of mixing. The head is placed at both ends of the heat exchanger and is closely connected to the tube sheet. On the one hand, it closes the shell, and on the other hand, it opens up an inlet and outlet path for the tube-side fluid. In addition, it cleverly constructs a multi-tube layout with the help of internal partitions to optimize the heat exchange process.

[0004] From the analysis of the working principle, heat transfer mainly relies on two methods: conduction and convection. During the conduction process, the high-temperature fluid rushes along the pipe, and the pipe wall absorbs the heat. By virtue of the vibration and collision between molecules, it is like an invisible "heat bridge" to transfer heat from the high-temperature side to the fluid or surrounding medium on the low-temperature side. Convection depends on the flow of fluid in the tube and shell. Uneven temperature causes relative displacement, which promotes heat migration. With the help of external forces such as pumps and fans, the fluid flows faster, the forced convection effect is enhanced, and the heat transfer efficiency is significantly improved.

[0005] However, focusing on the current industrial scene, especially when dealing with large flow and high temperature flue gas, the existing tubular heat exchangers have exposed many shortcomings. The heat exchanger involved in the patent application number CN202411481000.8 is difficult to complete the heat exchange and cooling task of large flow and high temperature flue gas.

[0006] Furthermore, the initial temperature of high-temperature flue gas is as high as 800-850℃. Once it flows into the heat exchanger, it will instantly heat the water to boiling, and a large amount of water vapor will be generated. How to properly dispose of this water vapor has become a difficult problem. If it is not handled properly, it may cause a series of chain reactions such as pipeline blockage and pressure imbalance, threatening the safe and stable operation of the equipment and reducing the reliability of the overall heat exchange system. Therefore, it is urgent to develop a new type of tubular heat exchanger to overcome the above disadvantages. Summary of the invention

[0007] In view of the problems pointed out in the background technology, the present invention proposes a double-circulation embedded stratified heat exchanger to solve the above technical problems.

[0008] The technical solution of the present invention is achieved in this way:

[0009] A double-circulation embedded stratified heat exchanger comprises a vertically arranged heat exchange tube, wherein the upper and lower ends of the heat exchange tube are respectively provided with sealing plates for sealing the heat exchange tube, the upper and lower ends of the heat exchange tube are respectively connected with a first outlet tube and a first inlet tube communicating with the interior thereof, the upper and lower ends of the heat exchange tube are respectively connected with a second inlet tube and a second outlet tube, a plurality of fluid tubes are arranged in the heat exchange tube, the two ends of the fluid tube pass through the sealing plates and are respectively communicated with the second inlet tube and the second outlet tube,

[0010] It also includes a vertically arranged barrel body, and the heat exchange tube is fixedly arranged inside the barrel body;

[0011] The second inlet pipe is connected to the second outlet pipe, and one end of the first inlet pipe is connected to the heat exchange pipe, and the other end extends to the outside of the barrel;

[0012] The lower end of the barrel body is provided with water outlet 1 and water outlet 2, and the upper end of the barrel body is provided with water inlet 1;

[0013] Also includes an external circulation water pump connected to the water outlet 1 and the water inlet 1;

[0014] It also includes an internal circulation water pump connected to the second water outlet and the first inlet pipe.

[0015] The present invention is further configured as follows:

[0016] The barrel body is provided with an evaporation chamber and a heat exchange chamber which are independent of each other, and the evaporation chamber is located on the upper side of the heat exchange chamber;

[0017] The heat exchange tube is located in the heat exchange chamber, and the second inlet pipe is located in the evaporation chamber;

[0018] The water inlet 1 is communicated with the evaporation chamber;

[0019] The barrel body is provided with a water inlet 2 connected to the upper end of the heat exchange chamber, and the water inlet 2 is connected to the water outlet 1 through an external circulation water pump;

[0020] A steam outlet is arranged on the side wall of the evaporation chamber.

[0021] The present invention is further configured such that a pressure relief port 1 is provided at the upper end of the barrel body, and the pressure relief port 1 is arranged higher than the water inlet 1.

[0022] The present invention is further configured such that a drain outlet is provided at the bottom of the barrel.

[0023] The present invention is further configured such that the barrel body is provided with a first pressure relief port and a second pressure relief port which are respectively connected to the upper ends of the evaporation chamber and the heat exchange chamber.

[0024] The present invention is further configured such that the barrel body is provided with an emergency water replenishment port which is respectively connected to the upper ends of the evaporation chamber and the heat exchange chamber.

[0025] The present invention is further configured such that a steam-water separation structure is provided in the evaporation chamber.

[0026] The present invention is further configured such that a water level monitoring device is provided in the evaporation chamber.

[0027] The present invention is further configured such that a heat absorption chamber is provided between the evaporation chamber and the heat exchange chamber, the upper end of the heat exchange tube is communicated with the heat absorption chamber, and one end of the second inlet pipe is communicated with the heat absorption chamber.

[0028] The present invention is further configured such that a heat absorbing component is provided on the upper side wall inside the heat absorbing chamber.

[0029] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0030] In terms of heat exchange efficiency, a leap forward has been achieved through a unique structural design. First, key components such as heat exchange tubes, inlet and outlet pipes are embedded in the barrel and completely wrapped in water, which greatly increases the heat exchange contact area and makes heat exchange more sufficient. Secondly, the barrel body is carefully designed with internal and external double circulation water circuits. The external circulation makes the water temperature in the barrel body uniform, avoiding local overheating or overcooling, and the internal circulation focuses on the core area of ​​the heat exchange tube to enhance heat exchange. The two complement each other, allowing heat to be transferred quickly and stably between water and fluid, efficiently dealing with large-flow high-temperature flue gas, and significantly improving heat exchange efficiency.

[0031] For steam treatment, the added evaporation chamber plays a key role. Facing the high-temperature exhaust gas of 800-850℃, the evaporation chamber becomes a steam generation chamber, which effectively solves the problem of water boiling instantly to produce water vapor. It not only avoids water vapor interfering with heat exchange, but also discharges steam from the steam outlet for utilization, realizes the conversion of waste heat energy into usable steam energy, and improves the comprehensive utilization rate of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a schematic diagram of the structure of the heat exchange tube of the present invention.

[0034] Figure 2 This is a schematic diagram of the structure of Example 1 of the present invention.

[0035] Figure 3 This is a schematic diagram of the structure of Example 2 of the present invention.

[0036] Figure 4 This is a schematic diagram of the structure of Example 3 of the present invention.

[0037] Explanation of the numbers in the accompanying drawings: heat exchange tube 1, sealing plate 2, first outlet pipe 3, first inlet pipe 4, second inlet pipe 5, second outlet pipe 6, fluid pipe 7, barrel body 8, water outlet one 9, water outlet two 10, water inlet one 11, external circulation water pump 12, internal circulation water pump 13, evaporation chamber 14, heat exchange chamber 15, water inlet two 16, steam outlet 17, pressure relief port one 18, drain port 19, pressure relief port two 20, emergency water replenishment port 21, steam-water separation structure 22, water level monitoring device 23, heat absorption chamber 24, heat absorption component 25. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] For reference Figure 1-4 The present invention is described:

[0040] Embodiment 1: A double-circulation embedded stratified heat exchanger comprises a vertically arranged heat exchange tube 1, wherein sealing plates 2 are respectively provided at the upper and lower ends of the heat exchange tube 1 to seal the heat exchange tube 1, and the sealing plates 2 serve to seal the heat exchange tube 1 to ensure that the internal fluid flows along a predetermined path.

[0041] The upper and lower ends of the heat exchange tube 1 are connected to a first outlet pipe 3 and a first inlet pipe 4 respectively. These two pipes are connected to the interior of the heat exchange tube 1 and become key passages for the fluid in the tube to enter and exit.

[0042] At the same time, the upper and lower ends of the heat exchange tube 1 are also connected to a second inlet tube 5 and a second outlet tube 6, which perform their respective functions and cooperate in the heat exchange process.

[0043] A number of fluid tubes 7 are arranged in the heat exchange tube 1. Both ends of these fluid tubes 7 penetrate the sealing plate 2 and are respectively connected to the second inlet tube 5 and the second outlet tube 6. Such a layout enables the high-temperature exhaust gas to flow accurately in the fluid tube 7, laying the foundation for subsequent efficient heat exchange.

[0044] It also includes a vertically arranged barrel body 8, which is the external frame of the entire heat exchanger, and the heat exchange tube 1 is fixedly arranged inside the barrel body 8. It is worth noting that the first outlet pipe 3, the first inlet pipe 4, the second inlet pipe 5, and the second outlet pipe 6 are all in the barrel body 8. This embedded design allows the heat exchange tube 1 and its auxiliary pipelines to be completely wrapped by the medium in the barrel body 8, greatly increasing the heat exchange contact area and improving the heat exchange potential.

[0045] The second inlet pipe 5, the second outlet pipe 6 and the first inlet pipe 4 are unique in structure. One end of them is tightly connected to the heat exchange tube 1, and the other end accurately passes through the side wall of the barrel body 8 and extends to the outside of the barrel body 8. This design not only ensures the smooth introduction and export of the internal fluid, but also takes into account the connection requirements with external equipment.

[0046] The lower end of the barrel body 8 is provided with a water outlet 1 9 and a water outlet 2 10 , and the upper end of the barrel body 8 is provided with a water inlet 11 .

[0047] It also includes an external circulation water pump 12 connected to the water outlet 9 and the water inlet 11.

[0048] It also includes an internal circulation water pump 13 connected to the second water outlet 10 and the first inlet pipe 4.

[0049] The upper end of the barrel 8 is provided with a pressure relief port 18, which is higher than the water inlet 11. The upper end of the barrel 8 is specially provided with a pressure relief port 18, and its position is higher than the water inlet 11. During the operation of the heat exchanger, if the pressure in the barrel 8 rises due to various factors, once the pressure exceeds the safety threshold, the pressure can be released to the outside in time through the pressure relief port 18 to ensure the safety of the overall structure of the equipment and prevent serious accidents such as pipeline rupture and seal failure caused by excessive pressure.

[0050] A drain port 19 is provided at the bottom of the barrel 8. The drain port 19 at the bottom of the barrel 8 facilitates the daily maintenance and cleaning of the equipment. When it is necessary to drain the barrel 8, such as regularly replacing the water in the barrel to maintain good heat exchange performance, or draining the accumulated water when the equipment is shut down for a long time for maintenance, it can be efficiently completed through the drain port 19.

[0051] The water in the barrel 8 has two circulation paths: inside and outside:

[0052] External circulation path: The lower end of the barrel 8 is carefully provided with a water outlet 19 and a water outlet 2 10, and the upper end is equipped with a water inlet 11. Among them, the external circulation relies on the external circulation water pump 12 to build a complete path. The water in the barrel 8 flows out from the water outlet 19 and enters the external circulation water pump 12. Driven by the power of the external circulation water pump 12, the water flow is accurately pushed to the water inlet 11, and then injected into the barrel 8 again. This external circulation process promotes the continuous mixing and flow of water in different areas of the barrel 8, effectively balancing the water temperature, avoiding the formation of local overheating or overcooling areas, and creating a stable water temperature environment for efficient heat exchange.

[0053] Internal circulation path: The internal circulation is realized by the internal circulation water pump 13. The water in the barrel 8 flows out from the water outlet 10, enters the internal circulation water pump 13, and is then pumped into the first inlet pipe 4, and then flows into the heat exchange tube 1. After the heat exchange is completed inside the heat exchange tube 1, the water flows out from the first outlet pipe 3 and returns to the barrel 8. The internal circulation allows the water to shuttle frequently in the core heat exchange area of ​​the heat exchange tube 1, quickly taking away the heat and enhancing the heat exchange effect.

[0054] Exhaust gas heat exchange path:

[0055] High-temperature exhaust gas treatment is one of the key tasks of this heat exchanger. The high-temperature exhaust gas with a temperature of 800-850°C first enters from the second inlet pipe 5, then flows into the fluid pipe 7, moves along the fluid pipe 7, and is finally discharged from the second outlet pipe 6 to the chimney. In this process, the exhaust gas exchanges heat with the water in the barrel 8 three times. The first time is when the exhaust gas just enters the second inlet pipe 5, it exchanges heat with the water in the barrel 8; then, when the exhaust gas flows in the fluid pipe 7, it exchanges heat with the water in the heat exchange pipe 1 and the water in the barrel 8 through the pipe wall; finally, when the exhaust gas passes through the second outlet pipe 6 before being discharged, it exchanges heat with the water in the barrel 8 again. After these three heat exchange "checkpoints", the exhaust gas temperature can be effectively reduced to about 100°C, achieving the purpose of efficient cooling.

[0056] Principle of improving heat exchange efficiency:

[0057] On the one hand, the internal and external dual circulation paths of the water in the barrel 8 have made great contributions. The external circulation continuously optimizes the water temperature distribution, and the internal circulation focuses on the core area of ​​the heat exchange tube 1 to strengthen the heat exchange. The two complement each other, enabling heat to be quickly and evenly transferred between water and exhaust gas. On the other hand, the heat exchange tube 1, the first outlet pipe 3, the first inlet pipe 4, the second inlet pipe 5, and the second outlet pipe 6 are all embedded in the barrel 8 and are wrapped in water in all directions, which greatly expands the heat exchange area, makes the heat exchange more sufficient, and improves the heat exchange efficiency from multiple dimensions, meeting the stringent requirements for efficient heat exchange and cooling of high-temperature exhaust gas in industrial production.

[0058] Embodiment 2: Embodiment 2 adds the following technical solutions on the basis of Embodiment 1:

[0059] On the basis of Example 1, Example 2 finely divides the internal structure of the barrel 8, and adds independent evaporation chambers 14 and heat exchange chambers 15. The evaporation chamber 14 is cleverly placed on the upper side of the heat exchange chamber 15. This layered layout makes full use of the natural rise of heat flow, creating conditions for subsequent efficient heat utilization and water vapor separation.

[0060] The heat exchange tube 1 is precisely positioned in the heat exchange chamber 15 to ensure that it can fully exchange heat with the fluid flowing through it in a stable water environment. The second inlet pipe 5 is arranged in the evaporation chamber 14. Since it bears the heavy responsibility of introducing high-temperature exhaust gas, when the high-temperature exhaust gas of 800-850℃ rushes into the second inlet pipe 5, the water in contact with the outer wall of the pipe will quickly absorb the high heat carried by the exhaust gas and reach a boiling state instantly, so that the evaporation chamber 14 is naturally transformed into an efficient steam generation chamber.

[0061] The water inlet 11 is connected to the evaporation chamber 14 to continuously replenish water for the evaporation chamber 14 to meet the demand for continuous evaporation of water by high-temperature exhaust gas.

[0062] The newly provided water inlet 2 16 on the barrel body 8 is connected to the upper end of the heat exchange chamber 15, and a tight external circulation link is constructed through the external circulation water pump 12 and the water outlet 1 9, so as to ensure that the water in the heat exchange chamber 15 can circulate stably and efficiently to maintain an ideal heat exchange environment.

[0063] A steam outlet 17 is carefully arranged on the side wall of the evaporation chamber 14. Once a large amount of steam is generated in the evaporation chamber 14, it can be discharged in an orderly manner through the outlet and then collected and utilized, thereby realizing the effective conversion of waste heat energy into usable steam energy and improving the energy utilization rate of the entire system.

[0064] The internal circulation path of Example 2 is consistent with that of Example 1, that is, the water in the barrel 8 flows out from the second water outlet 10, enters the internal circulation water pump 13, and is then pumped into the first inlet pipe 4, and then flows into the heat exchange tube 1. After the heat exchange is completed inside the heat exchange tube 1, the water flows out from the first outlet pipe 3 and returns to the barrel 8. This stable internal circulation mechanism continuously ensures efficient heat exchange in the core area of ​​the heat exchange tube 1, quickly takes away heat, and enhances the overall heat exchange effect.

[0065] The external circulation path has been optimized in a targeted manner compared to Example 1. After the water in the barrel body 8 flows out from the water outlet 19 and enters the external circulation water pump 12, it no longer flows back directly to the upper water inlet 11 of the barrel body 8, but is accurately pushed to the water inlet 2 16, and then injected into the heat exchange chamber 15. At the same time, the external circulation water pump 12 also performs timely and appropriate water addition operations for the evaporation chamber 14 through the water inlet 11, which not only ensures the dynamic balance of the water in the evaporation chamber 14, but also realizes the efficient circulation and renewal of the water in the heat exchange chamber 15, and synergistically improves the heat exchange efficiency and steam generation efficiency from two levels.

[0066] Example 2 shows excellent performance improvement when treating high-temperature exhaust gas. On the one hand, it effectively solves the problem in Example 1 that high-temperature exhaust gas entering water easily leads to the instantaneous generation of a large amount of water vapor and is difficult to control. The steam is orderly extracted and utilized through the independent evaporation chamber 14, avoiding the accumulation of water vapor in the heat exchange chamber 15 and interfering with the heat exchange effect. On the other hand, the finely adjusted external circulation path makes the water temperature distribution in the heat exchange chamber 15 more reasonable, which complements the internal circulation and comprehensively strengthens the heat transfer process. It can not only effectively reduce the temperature of high-temperature exhaust gas to about 100°C, but also realize the additional output of steam energy, which provides strong support for the comprehensive utilization of energy and energy conservation and emission reduction in industrial production.

[0067] The barrel body 8 is provided with a pressure relief port 18 and a pressure relief port 20 which are communicated with the upper ends of the evaporation chamber 14 and the heat exchange chamber 15 respectively.

[0068] The pressure relief port 18 is connected to the upper end of the evaporation chamber 14. When the pressure in the evaporation chamber 14 rises suddenly due to factors such as continuous input of high-temperature exhaust gas and rapid generation of water vapor, the pressure relief port 18 can be opened in time to release the pressure exceeding the safety threshold to the outside, effectively preventing serious accidents such as chamber rupture and sealing failure caused by excessive pressure, thereby ensuring stable operation of the key area of ​​the evaporation chamber 14.

[0069] At the same time, the second pressure relief port 20 connected to the upper end of the heat exchange chamber 15 also plays a vital role. During the heat exchange process, if the pressure in the heat exchange chamber 15 fluctuates abnormally due to abnormal water circulation, excessive heat accumulation, etc., the second pressure relief port 20 can quickly intervene to discharge the excess pressure, thereby protecting the equipment components in the heat exchange chamber 15 from high pressure shock and maintaining the smooth progress of the entire heat exchange process.

[0070] The barrel body 8 is provided with an emergency water replenishment port 21 which is connected to the upper end of the evaporation chamber 14 and the heat exchange chamber 15 respectively. The setting of the emergency water replenishment port 21 provides a key guarantee for the system to cope with emergencies. Being connected to the upper ends of the evaporation chamber 14 and the heat exchange chamber 15 respectively means that whether the water level in the evaporation chamber 14 drops sharply due to rapid steam generation, or the heat exchange chamber 15 is short of water due to leakage, circulation imbalance and other problems, the emergency water replenishment port 21 can be used to replenish water in a timely and accurate manner. This design greatly enhances the fault tolerance of the system in the face of unexpected situations such as pipeline rupture and water pump failure, ensuring that the heat exchanger can maintain basic heat exchange and steam generation functions in a short period of time, reducing the risk of production interruption.

[0071] A steam-water separation structure 22 is provided in the evaporation chamber 14. The steam-water separation structure 22 provided in the evaporation chamber 14 plays a decisive role in the quality of steam output. In the process of high-temperature exhaust gas causing a large amount of water to vaporize, a steam-water mixture is produced. If it is not effectively separated, the wet steam is directly discharged, which will not only reduce the utilization value of the steam, but also may cause corrosion, scaling and other damages to the subsequent utilization equipment.

[0072] Baffle-type steam-water separation structure: A series of inclined baffles are installed on the top of the inner tank. During the steam rising process, it hits the baffle and changes direction. Due to the different inertia of steam and water, water droplets will gather on the baffle and fall back into the water in the inner tank, while the steam can bypass the baffle and continue to rise and be discharged through the steam outlet. This structure is simple and effective, with low cost, and is widely used in small and medium-sized steam generators.

[0073] Cyclone steam-water separation structure: This structure uses the principle of centrifugal force. After the steam enters the cyclone separator, it will rotate at high speed inside. Under the action of centrifugal force, the water droplets are thrown to the wall of the separator, and then flow down along the wall, while the steam is discharged upward at the center. The cyclone steam-water separation structure has a good separation effect and is suitable for occasions with high requirements for steam quality, such as some high-precision industrial heating or experimental equipment.

[0074] A water level monitoring device 23 is provided in the evaporation chamber 14. The existence of the water level monitoring device 23 realizes real-time control of the water level in the evaporation chamber 14. As the high-temperature exhaust gas continuously heats and vaporizes the water, the water level in the evaporation chamber 14 is in dynamic change. The water level monitoring device 23 continuously collects water level data. Once the water level deviates from the preset normal range, whether it is too high and may cause steam-water co-evaporation and affect the steam quality, or too low and affect the continuous generation of steam, the system can adjust the water inlet flow rate, steam discharge rate and other parameters in time according to the monitoring information to ensure that the evaporation chamber 14 is always in an efficient and stable operating state, and to ensure the reliable operation of the entire heat exchanger system.

[0075] In the process of further optimization, the design ideas for the water supply configuration of water inlet 11 and water inlet 2 16 are further optimized.

[0076] On the one hand, the two can share an external circulation water pump 12, so that the layout can simplify the equipment architecture and reduce the cost investment. Through reasonable pipeline connection and pump flow distribution design, the external circulation water pump 12 can provide circulating water to the evaporation chamber 14 and the heat exchange chamber 15 in an orderly manner according to the system operation requirements. For example, at the beginning of the system startup, priority is given to ensuring the rapid filling of the heat exchange chamber 15 to establish a stable heat exchange environment; as the operation progresses, the amount of water supplied to the evaporation chamber 14 is dynamically adjusted according to the steam generation rate in the evaporation chamber 14 to ensure stable steam output.

[0077] On the other hand, the water inlet 11 and the water inlet 2 16 can also use an external circulation water pump 12 respectively. This independent configuration gives the two chambers a higher water supply autonomy. Each external circulation water pump 12 can accurately adjust the water supply flow and pressure according to the real-time working conditions of the chamber to which it belongs, especially when dealing with complex and changeable industrial heat exchange needs, such as processing high-temperature exhaust gas with large flow and temperature fluctuations, to ensure that the water circulation of the two chambers is not interfered with by each other and maintain their respective optimal operating conditions.

[0078] At the same time, an electric control valve is added to the water inlet 11 to accurately control its opening and closing time. This design adds an intelligent element to the operation and management of the evaporation chamber 14. The electric control valve can be linked with the water level monitoring device. When the water level monitoring device detects that the water level in the evaporation chamber 14 is lower than the set lower limit, the electric control valve automatically opens to replenish the water source in time; once the water level returns to the normal range, the electric control valve quickly closes to prevent excessive water inflow. In addition, the opening time of the electric control valve can be intelligently adjusted according to the steam flow, pressure and other parameters of the steam outlet 17 to ensure that the evaporation chamber 14 can stably and efficiently produce steam under different working conditions, further improving the adaptability and reliability of the entire heat exchanger system.

[0079] Embodiment 3: Embodiment 3 adds the following technical solutions on the basis of Embodiment 2:

[0080] Based on the fine structure of Example 2, Example 3 is further innovative, and a heat absorption chamber 24 is cleverly embedded between the evaporation chamber 14 and the heat exchange chamber 15. The setting of this key area replans the flow route of the high-temperature exhaust gas, so that the high-temperature exhaust gas flows into the heat absorption chamber 24 through the second inlet pipe 5 before entering the fluid pipe 7. Such a layout makes full use of the heat gradient of the high-temperature exhaust gas from the initial high-temperature state to the subsequent heat exchange process, creating favorable conditions for multi-stage heat recovery.

[0081] The upper end of the heat exchange tube 1 is connected to the heat absorption chamber 24. This connection method opens up the heat conduction channel between the heat exchange tube 1 and the heat absorption chamber 24, so that the heat absorbed in the heat absorption chamber 24 can be partially transferred to the heat exchange tube 1, and then participate in the heat cycle system of the entire heat exchanger, thereby improving the overall heat utilization efficiency. At the same time, one end of the second inlet pipe 5 is connected to the heat absorption chamber 24, ensuring that the high-temperature exhaust gas can smoothly enter the heat absorption chamber 24 without obstruction, laying the foundation for the subsequent heat absorption link.

[0082] Heat absorbing components enhance heat absorption performance:

[0083] The heat absorption component 25 is carefully arranged on the inner upper side wall of the heat absorption chamber 24. The component is designed according to advanced thermophysical principles and is made of materials with high specific heat capacity and good thermal conductivity. It can quickly capture the heat in the exhaust gas at the moment when the high-temperature exhaust gas flows into the heat absorption chamber 24. When the high-temperature exhaust gas impacts the heat absorption chamber 24 at a high temperature of 800-850°C, the heat absorption component 25 efficiently absorbs and stores the heat through its own structure and material properties, effectively reducing the exhaust gas temperature, reducing the burden on the subsequent heat exchange process, and also reserving sufficient heat energy for the next step of heating the water in the evaporation chamber 14.

[0084] High-temperature exhaust gas heat is utilized step by step:

[0085] After the high-temperature exhaust gas enters the heat absorption chamber 24, the heat it carries is largely absorbed by the heat absorption component 25 and the chamber wall, achieving the first interception of heat. After the initial cooling treatment in the heat absorption chamber 24, the exhaust gas temperature is reduced, but still retains considerable heat, and then enters the fluid pipe 7 to continue to release the remaining heat in the subsequent heat exchange process, ensuring that the heat is fully and orderly utilized, avoiding the concentrated explosion and waste of heat in the initial stage.

[0086] The heat absorption components 25 are metal strips arranged at intervals.

[0087] Optimization of heating supply to the evaporation chamber:

[0088] After absorbing heat, the heat absorption chamber 24 is transformed into an efficient heat source for the evaporation chamber 14. Since the heat absorption chamber 24 is closely adjacent to the evaporation chamber 14 and there is a heat conduction path, the heat stored in it can be stably transferred to the water in the evaporation chamber 14. Compared with direct heating by high-temperature exhaust gas alone, this indirect heating method is more controllable and uniform, and can accurately heat the water in the evaporation chamber 14 to a boiling state, and continuously produce steam, which not only ensures the stability of steam generation, but also improves the quality of steam output, and further meets the dual needs of industrial production for high-quality steam and efficient heat exchange.

[0089] The heat exchange tube 1 is fixedly connected to the inner wall of the barrel 8 through a bracket. The design of the bracket has been carefully considered, and is made of materials with certain strength and corrosion resistance, such as stainless steel, to ensure that it will not easily rust or deform under long-term contact with water and high temperature environment. The structural form of the bracket is customized according to the size and weight of the heat exchange tube 1 and the internal space layout of the barrel 8. It usually adopts a multi-point support method, which is evenly distributed on the outer periphery of the heat exchange tube 1, which not only ensures the stability of the position of the heat exchange tube 1 in the barrel 8, avoiding displacement due to water flow impact, equipment vibration and other factors, affecting the heat exchange effect, but also provides a certain buffer protection for the heat exchange tube 1, prolonging its service life, thereby ensuring the reliable operation of the entire heat exchanger system.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-circulation embedded stratified heat exchanger, comprising a vertically arranged heat exchange tube (1), wherein the upper and lower ends of the heat exchange tube (1) are respectively provided with sealing plates (2) for sealing the heat exchange tube, wherein the upper and lower ends of the heat exchange tube (1) are respectively connected to a first outlet tube (3) and a first inlet tube (4) which are in communication with the interior thereof, wherein the upper and lower ends of the heat exchange tube (1) are respectively connected to a second inlet tube (5) and a second outlet tube (6), wherein a plurality of fluid tubes (7) are arranged in the heat exchange tube (1), wherein the two ends of the fluid tube (7) pass through the sealing plates (2) and are respectively in communication with the second inlet tube (5) and the second outlet tube (6), wherein the heat exchange tube (1) is provided with a plurality of fluid tubes (7 ... It also includes a barrel body (8) arranged vertically, and the heat exchange tube (1) is fixedly arranged inside the barrel body (8); The second inlet pipe (5) and the second outlet pipe (6) are connected, and the first inlet pipe (4) is connected to the heat exchange pipe (1) at one end and extends to the outside of the barrel (8) at the other end; The lower end of the barrel body (8) is provided with a water outlet 1 (9) and a water outlet 2 (10), and the upper end of the barrel body (8) is provided with a water inlet 1 (11); It also includes an external circulation water pump (12) connected to the water outlet 1 (9) and the water inlet 1 (11); It also includes an internal circulation water pump (13) connected to the second water outlet (10) and the first inlet pipe (4); The barrel body (8) is provided with an evaporation chamber (14) and a heat exchange chamber (15) which are independent of each other, and the evaporation chamber (14) is located on the upper side of the heat exchange chamber (15); The heat exchange tube (1) is located in the heat exchange chamber (15), and the second inlet pipe (5) is located in the evaporation chamber (14); The water inlet 1 (11) is connected to the evaporation chamber (14); The barrel body (8) is provided with a second water inlet (16) which is in communication with the upper end of the heat exchange chamber (15); the second water inlet (16) is connected to the first water outlet (9) via an external circulation water pump (12); A steam outlet (17) is provided on the side wall of the evaporation chamber (14).

2. A double-circulation embedded stratified heat exchanger according to claim 1, characterized in that: The upper end of the barrel body (8) is provided with a pressure relief port 1 (18), and the pressure relief port 1 (18) is arranged higher than the water inlet 1 (11).

3. The double-circulation embedded stratified heat exchanger according to claim 1, characterized in that: The bottom of the barrel body (8) is provided with a drainage outlet (19).

4. A double-circulation embedded stratified heat exchanger according to claim 2, characterized in that: The barrel body (8) is provided with a first pressure relief port (18) and a second pressure relief port (20) which are respectively connected to the upper ends of the evaporation chamber (14) and the heat exchange chamber (15).

5. The double-circulation embedded stratified heat exchanger according to claim 2, characterized in that: The barrel body (8) is provided with an emergency water replenishment port (21) which is in communication with the upper ends of the evaporation chamber (14) and the heat exchange chamber (15), respectively.

6. A double-circulation embedded stratified heat exchanger according to claim 2, characterized in that: A steam-water separation structure (22) is provided in the evaporation chamber (14).

7. The double-circulation embedded stratified heat exchanger according to claim 2, characterized in that: A water level monitoring device (23) is provided in the evaporation chamber (14).

8. The double-circulation embedded stratified heat exchanger according to claim 2, characterized in that: A heat absorption chamber (24) is provided between the evaporation chamber (14) and the heat exchange chamber (15); the upper end of the heat exchange tube (1) is in communication with the heat absorption chamber (24); and one end of the second inlet pipe (5) is in communication with the heat absorption chamber (24).

9. A double-circulation embedded stratified heat exchanger according to claim 8, characterized in that: A heat absorption component (25) is provided on the upper side wall inside the heat absorption chamber (24).

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