Evaporator with waste heat recovery mechanism
Patent Information
- Application Number
- CN202522042821.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-23
AI Technical Summary
[0002]蒸发器因换热效率高、适应性强，是工业生产中应用最广泛的浓缩设备之一，其核心原理是通过加热室的高温介质加热列管内的待处理原料，使原料汽化后实现汽液分离，但现有蒸发器在实际应用中存在以下关键技术缺陷，一是能源利用效率低下，余热损耗构成核心能耗浪费，加热室作为主换热单元，其外壁自然散热、冷凝水排出口排出的低温冷凝水，以及循环管内回流浓液的残余显热，均直接散失至环境，未形成能源闭环，待处理原料多以常温直接进入列管，缺乏基于系统内余热的预加热环节，导致加热室需持续输出高负荷热量以满足原料汽化需求，进一步推高主能源消耗，二是结构集成度低，衍生运行稳定性与运维成本问题，外置换热器需通过长距离管道与主体设备连接，不仅使设备整体占地面积增加，还因管道传输导致额外热损失，削弱余热回收效果，分体式结构需独立运维，且管道接口易因热胀冷缩出现泄漏，影响系统密封性，列管排出的汽液混合物缺乏过渡性稳压结构，直接进入蒸发室易导致流速波动，造成汽液分离不均匀，影响产品质量稳定性，难以满足高精度工业生产需求
[0011]与现有技术相比，本实用新型所达到的有益效果是：本实用新型采用有结构化设计，该装置通过加热室环形预热、循环管蛇型预热的双路径协同设计，构建高效余热回收闭环，一方面，加热室外壁环绕的一级至四级环形预热管通过连通管形成梯度换热通道，环形结构使换热面积较传统直管式得到提升，可同步捕获加热室外壁散热、冷凝水余热，另一方面，循环管外壁贴合的蛇型预热管延长原料停留时间，且双路径可根据原料粘度、沸点等特性灵活切换单、双进料模式，如高粘度原料优先启用蛇型预热管避免堵塞，余热机构与主体设备嵌入式整合，无需独立外置空间，且预热管与主体设备的近距离连接，同时采用法兰式可拆卸连接，运维工序减少，降低维护成本，加热室与蒸发室之间增设的汇集腔可对汽液混合物进行缓冲稳压，确保蒸发室内汽液分离均匀，提升产品质量稳定性，此外，该改进结构可直接适配现有列管式蒸发器的改造。
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Figure CN224735773U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of evaporator technology, and in particular to an evaporator with a waste heat recovery mechanism. Background Technology
[0002] Evaporators are among the most widely used concentration devices in industrial production due to their high heat exchange efficiency and adaptability. Their core principle is to heat the raw material inside the tubes using a high-temperature medium in the heating chamber, causing vaporization and achieving vapor-liquid separation. However, existing evaporators suffer from the following key technical defects in practical applications: First, low energy utilization efficiency, with waste heat loss constituting a major energy waste. As the main heat exchange unit, the heating chamber experiences natural heat dissipation from its outer wall, low-temperature condensate discharged from the condensate outlet, and residual sensible heat from the reflux concentrate in the circulating pipes—all of which are directly lost to the environment, failing to form an energy closed loop. Furthermore, the raw material often enters the tubes directly at room temperature, lacking a preheating process based on the system's waste heat. This leads to several issues: firstly, the heating chamber needs to continuously output high-load heat to meet the vaporization requirements of raw materials, further increasing the main energy consumption; secondly, the low structural integration leads to problems with operational stability and maintenance costs; thirdly, the external heat exchanger needs to be connected to the main equipment through long-distance pipelines, which not only increases the overall footprint of the equipment but also causes additional heat loss due to pipeline transmission, weakening the waste heat recovery effect; fourthly, the split structure requires independent operation and maintenance, and the pipeline interfaces are prone to leakage due to thermal expansion and contraction, affecting the system's sealing performance; and fifthly, the lack of a transitional pressure stabilization structure for the vapor-liquid mixture discharged from the tubes and directly entering the evaporation chamber can easily lead to flow rate fluctuations, resulting in uneven vapor-liquid separation, affecting product quality stability, and making it difficult to meet the needs of high-precision industrial production. Utility Model Content
[0003] The purpose of this invention is to provide an evaporator with a waste heat recovery mechanism to solve the problems mentioned in the background art.
[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an evaporator with a waste heat recovery mechanism, including a raw material chamber, a first feed port is provided on one side of the outer wall of the raw material chamber, a flange is fixedly connected to the first feed port, a second feed port is provided on one side of the outer wall of the raw material chamber, a tube set on the raw material chamber, a return pipe is provided on one side of the outer wall of the raw material chamber, a heating chamber is provided on the raw material chamber, and the tube set is located in the heating chamber, a perforation is provided in the heating chamber, and the top end of the tube set passes through the perforation.
[0005] As a further technical solution of this utility model, a steam inlet is provided on one side of the outer wall of the heating chamber, a condensate outlet is provided on one side of the outer wall of the heating chamber, and a waste heat preheating mechanism is provided on the outer wall of the heating chamber.
[0006] As a further technical solution of this utility model, the waste heat preheating mechanism includes a first-stage annular preheating pipe, a first-stage feed inlet, a second-stage annular preheating pipe, a third-stage annular preheating pipe, a fourth-stage annular preheating pipe, a U-shaped discharge pipe, and a connecting pipe, wherein a first-stage feed inlet is provided on the first-stage annular preheating pipe.
[0007] As a further technical solution of this utility model, the connecting pipe is provided with a first-stage annular preheating pipe, a first-stage feed inlet, a second-stage annular preheating pipe, a third-stage annular preheating pipe and a fourth-stage annular preheating pipe from top to bottom. A U-shaped discharge pipe is provided on the fourth-stage annular preheating pipe, and a first feed port is provided at the end of the U-shaped discharge pipe.
[0008] As a further technical solution of this utility model, the heating chamber is provided with a collecting cavity, the outer wall of the collecting cavity is provided with a first connecting pipe, the outer side of the collecting cavity is provided with an evaporation chamber, the outer wall of one side of the evaporation chamber is provided with a second connecting pipe, and the end of the first connecting pipe is provided at one end of the second connecting pipe. The upper surface of the evaporation chamber is provided with a secondary steam outlet, and the bottom of the evaporation chamber is provided with a conical cavity.
[0009] As a further technical solution of this utility model, a liquid outlet is provided on one side of the outer wall of the conical cavity, a circulation pipe is provided at the bottom of the conical cavity, and a serpentine preheating pipe is provided on the outer wall of the circulation pipe.
[0010] As a further technical solution of this utility model, one end of the serpentine preheating tube is provided with a secondary feed port, the end of the serpentine preheating tube is provided with a conveying pipe, and the end of the conveying pipe is provided with a second conveying port.
[0011] Compared with existing technologies, the beneficial effects achieved by this utility model are as follows: This utility model adopts a structured design. The device constructs a highly efficient waste heat recovery closed loop through a dual-path collaborative design of annular preheating in the heating chamber and serpentine preheating in the circulating pipe. On one hand, the first to fourth stage annular preheating pipes surrounding the outer wall of the heating chamber form a gradient heat exchange channel through connecting pipes. The annular structure increases the heat exchange area compared to the traditional straight pipe type, simultaneously capturing heat dissipation from the outer wall of the heating chamber and waste heat from condensate. On the other hand, the serpentine preheating pipes attached to the outer wall of the circulating pipe extend the raw material residence time, and the dual paths can be adjusted according to… The system allows for flexible switching between single and dual feed modes based on raw material viscosity, boiling point, and other characteristics. For example, high-viscosity raw materials can be preferentially fed using a serpentine preheating tube to avoid clogging. The waste heat recovery mechanism is integrated into the main equipment, eliminating the need for a separate external space. Furthermore, the preheating tube is connected to the main equipment at close range and uses a flange-type detachable connection, reducing maintenance procedures and lowering maintenance costs. The additional collection chamber between the heating chamber and the evaporation chamber can buffer and stabilize the vapor-liquid mixture, ensuring uniform vapor-liquid separation within the evaporation chamber and improving product quality stability. In addition, this improved structure can be directly adapted to the retrofitting of existing shell-and-tube evaporators. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the raw material chamber of this utility model; Figure 3 This is a three-dimensional structural diagram of part of the present utility model.
[0014] In the diagram: 1. Raw material chamber; 2. First feed inlet; 3. Flange; 4. Tube; 5. Second feed inlet; 6. Return pipe; 7. Heating chamber; 8. Perforation; 9. Steam inlet; 10. Condensate outlet; 11. Waste heat preheating mechanism; 1101. Primary annular preheating pipe; 1102. Primary feed inlet; 1103. Secondary annular preheating pipe; 1104. Tertiary annular preheating pipe; 1105. Quaternary annular preheating pipe; 1106. U-shaped discharge pipe; 1107. Connecting pipe; 12. Collection chamber; 13. First connecting pipe; 14. Evaporation chamber; 15. Second connecting pipe; 16. Secondary steam outlet; 17. Conical chamber; 18. Liquid outlet; 19. Circulation pipe; 20. Serpentine preheating pipe; 21. Secondary feed inlet; 22. Feed pipe. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0016] Please see the appendix Figure 1 - Appendix Figure 3This utility model provides an embodiment of an evaporator with a waste heat recovery mechanism, comprising a raw material chamber 1, a first feed port 2 on one side of the outer wall of the raw material chamber 1, a flange 3 fixedly connected to the first feed port 2, a second feed port 5 on one side of the outer wall of the raw material chamber 1, tubes 4 arranged on the raw material chamber 1, a return pipe 6 arranged on one side of the outer wall of the raw material chamber 1, a heating chamber 7 arranged on the raw material chamber 1, with the tubes 4 arranged in the heating chamber 7, and a perforation 8 opened in the heating chamber 7, the top end of the tubes 4 passing through the perforation 8; a steam inlet 9 and a condensate outlet 10 on one side of the outer wall of the heating chamber 7; and a waste heat preheating mechanism 11 arranged on the outer wall of the heating chamber 7 for recovering heat from the heating chamber 7. The waste heat from the condensate drain outlet 10 on the outer wall is used to preheat the raw materials. The waste heat preheating mechanism 11 includes a primary annular preheating pipe 1101, a primary feed inlet 1102, a secondary annular preheating pipe 1103, a tertiary annular preheating pipe 1104, a quaternary annular preheating pipe 1105, a U-shaped discharge pipe 1106, and a connecting pipe 1107. The primary annular preheating pipe 1101 has a primary feed inlet 1102, which surrounds the outer wall of the heating chamber 7 in a concentric ring structure to ensure full contact with the outer wall of the heating chamber 7. The connecting pipe 1107 is arranged from top to bottom with the primary annular preheating pipe 1101, the primary feed inlet 1102, the secondary annular preheating pipe 1103, the tertiary annular preheating pipe 1104, and the quaternary annular preheating pipe 1105. A U-shaped discharge pipe 1106 is provided on the annular preheating pipe 1105. A first feed port 2 is provided at the end of the U-shaped discharge pipe 1106. A connecting pipe 1107 is provided, and its two ends are welded to the ends of adjacent annular preheating pipes to realize the series connection of each annular preheating pipe. This allows the raw material to flow in a gradient along the first, second, third, and fourth stages, gradually absorbing waste heat. A collecting chamber 12 is provided on the heating chamber 7. A first connecting pipe 13 is provided on the outer wall of the collecting chamber 12. An evaporation chamber 14 is provided on the outer side of the collecting chamber 12. A second connecting pipe 15 is provided on one side of the outer wall of the evaporation chamber 14, and the end of the first connecting pipe 13 is located at one end of the second connecting pipe 15. A secondary steam outlet 16 is opened on the upper surface of the evaporation chamber 14, and the bottom of the evaporation chamber 14 is provided with... A conical cavity 17 is provided, and a secondary steam outlet 16 is located at the top center of the evaporation chamber 14 to discharge the pure raw material steam after separation. A liquid outlet 18 is provided on one side of the outer wall of the conical cavity 17. A circulation pipe 19 is provided at the bottom of the conical cavity 17. A serpentine preheating pipe 20 is provided on the outer wall of the circulation pipe 19. The serpentine preheating pipe 20 is closely attached to the outer wall of the circulation pipe 19 in a serpentine shape to recover the sensible heat of the concentrated liquid in the circulation pipe 19. A secondary feed inlet 21 is provided at one end of the serpentine preheating pipe 20. A conveying pipe 22 is provided at the end of the serpentine preheating pipe 20. A second conveying port 5 is provided at the end of the conveying pipe 22. The secondary feed inlet 21 is located at the starting end of the serpentine preheating pipe 20 to connect another ambient temperature raw material to be preheated, forming a dual-path preheating.
[0017] Working Principle: Using this invention, the raw material to be processed is first preheated synchronously through a dual-path system, recovering waste heat from the heating chamber 7 and the circulation pipe 19 respectively. The raw material at room temperature is connected to the primary feed inlet 1102 via an external pipeline and enters the primary annular preheating pipe 1101. Because the primary annular preheating pipe 1101, the secondary annular preheating pipe 1103, the tertiary annular preheating pipe 1104, and the quaternary annular preheating pipe 1105 are connected in series from top to bottom through the connecting pipe 1107 and are arranged around the outer wall of the heating chamber 7, the raw material can flow along the gradient of the annular pipe. During the process, it absorbs the heat emitted from the outer wall of the heating chamber 7 and the residual heat of the low-temperature condensate near the condensate outlet 10, thus gradually increasing the temperature. The preheated raw material finally passes through the quaternary annular preheating pipe 1105. The U-shaped discharge pipe 1106 at the end conveys the material to the first feed port 2. The flange 3 on the first feed port 2 is used to seal the connection between the external pipeline and the raw material chamber 1. The material enters the raw material chamber 1. Another path of ambient temperature raw material to be processed enters the secondary feed port 21 through the external pipeline and enters the serpentine preheating pipe 20 sleeved on the outer wall of the circulation pipe 19. Since the circulation pipe 19 is filled with high-temperature reflux concentrate that has not reached the required concentration, the raw material can fully absorb the sensible heat of the concentrate transferred from the outer wall of the circulation pipe 19 when it flows along the serpentine path in the serpentine preheating pipe 20, thereby increasing the temperature. The preheated raw material is conveyed to the second feed port 5 through the feed pipe 22 at the end of the serpentine preheating pipe 20, and finally flows into the raw material chamber 1. The raw material preheated by the two paths converges in the raw material chamber 1, and at the same time, it is combined with the untreated raw material conveyed by the reflux pipe 6. The concentrated reflux liquid is mixed to form a mixture of preheated raw material and reflux concentrated liquid. After temporary storage and pressure stabilization in the raw material chamber 1, the mixture flows naturally into the tube 4 that runs through the raw material chamber 1. The tube 4 is the core heat exchange component; its lower end is connected to the raw material chamber 1, and its upper end needs to pass through the perforation 8 opened on the heating chamber 7 to ensure that the main body of the tube 4 is located inside the heating chamber 7, preparing for subsequent main heating. High-temperature heating steam is introduced into the heating chamber 7 through the steam inlet 9. The heating chamber 7 is a closed chamber, with steam entering through the steam inlet 9 and condensate exiting through the condensate outlet 10. Because the main body of the tube 4 is located inside the heating chamber 7, the heating steam can directly wrap around the outer wall of the tube 4, transferring heat to the mixture inside the tube 4 through heat conduction. After absorbing heat, the mixture gradually heats up to its boiling point, and finally... The vaporized liquid mixture, after exchanging heat with the outer wall of the tube 4, condenses into low-temperature condensate, which is discharged from the heating chamber 7 through the condensate outlet 10. During the discharge process, some residual heat is absorbed and utilized by the annular preheating tube of the waste heat preheating mechanism 11. The vapor-liquid mixture generated inside the tube 4 flows upward along the tube 4, passes through the perforation 8 of the heating chamber 7 (which serves both sealing and guiding functions to prevent steam leakage from the heating chamber 7), and then flows into the collecting chamber 12 above the heating chamber 7. The collecting chamber 12 buffers and stabilizes the vapor-liquid mixture to avoid fluctuations in the flow rate at the outlet of the tube 4, ensuring stable subsequent delivery. The stabilized vapor-liquid mixture is then transported through the first connecting pipe 13 on the outer wall of the collecting chamber 12 to the second connecting pipe 15, and finally enters the evaporation chamber 14.The separated pure raw material vapor flows upward and exits through the secondary steam outlet 16 on the upper surface of the evaporation chamber 14. It can be subsequently connected to the condenser for recovery or used as a heat source for other processes. The separated liquid concentrate flows downward under gravity and flows into the conical cavity 17 at the bottom of the evaporation chamber 14. If the concentrate concentration meets the standard, it is discharged through the liquid outlet 18 on one side of the outer wall of the conical cavity 17 as finished product collection. If the concentrate concentration does not meet the standard, it flows downward through the circulation pipe 19 at the bottom of the conical cavity 17 and is finally returned to the raw material chamber 1 through the return pipe 6. After mixing with the newly preheated raw material, it re-enters the tube 4 for heating, achieving a cyclical process.
[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0019] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. An evaporator with a waste heat recovery mechanism, comprising a raw material chamber (1), characterized in that: A first feed port (2) is provided on one side of the outer wall of the raw material chamber (1), and a flange (3) is fixedly connected to the first feed port (2). A second feed port (5) is provided on one side of the outer wall of the raw material chamber (1). A tube (4) is provided on the raw material chamber (1). A return pipe (6) is provided on one side of the outer wall of the raw material chamber (1). A heating chamber (7) is provided on the raw material chamber (1), and the tube (4) is located in the heating chamber (7). A perforation (8) is provided on the heating chamber (7), and the top end of the tube (4) passes through the perforation (8).
2. An evaporator with a waste heat recovery mechanism according to claim 1, characterized in that: A steam inlet (9) is provided on one side of the outer wall of the heating chamber (7), a condensate outlet (10) is provided on one side of the outer wall of the heating chamber (7), and a waste heat preheating mechanism (11) is provided on the outer wall of the heating chamber (7).
3. An evaporator with a waste heat recovery mechanism according to claim 2, characterized in that: The waste heat preheating mechanism (11) includes a primary annular preheating pipe (1101), a primary feed inlet (1102), a secondary annular preheating pipe (1103), a tertiary annular preheating pipe (1104), a quaternary annular preheating pipe (1105), a U-shaped discharge pipe (1106), and a connecting pipe (1107). The primary annular preheating pipe (1101) is provided with a primary feed inlet (1102).
4. An evaporator with a waste heat recovery mechanism according to claim 3, characterized in that: The connecting pipe (1107) is provided with a first-stage annular preheating pipe (1101), a first-stage feed inlet (1102), a second-stage annular preheating pipe (1103), a third-stage annular preheating pipe (1104), and a fourth-stage annular preheating pipe (1105) from top to bottom. A U-shaped discharge pipe (1106) is provided on the fourth-stage annular preheating pipe (1105), and a first feed port (2) is provided at the end of the U-shaped discharge pipe (1106).
5. An evaporator with a waste heat recovery mechanism according to claim 2, characterized in that: The heating chamber (7) is provided with a collecting chamber (12), and a first connecting pipe (13) is provided on the outer wall of the collecting chamber (12). An evaporation chamber (14) is provided on the outer side of the collecting chamber (12). A second connecting pipe (15) is provided on one side of the outer wall of the evaporation chamber (14), and the end of the first connecting pipe (13) is provided at one end of the second connecting pipe (15). A secondary steam outlet (16) is provided on the upper surface of the evaporation chamber (14), and a conical cavity (17) is provided at the bottom of the evaporation chamber (14).
6. An evaporator with a waste heat recovery mechanism according to claim 5, characterized in that: The conical cavity (17) has an outlet (18) on one side of its outer wall, and a circulation pipe (19) is provided at the bottom of the conical cavity (17). A serpentine preheating pipe (20) is provided on the outer wall of the circulation pipe (19).
7. An evaporator with a waste heat recovery mechanism according to claim 6, characterized in that: The serpentine preheating pipe (20) has a secondary feed inlet (21) at one end and a conveying pipe (22) at the other end, with a second conveying port (5) at the other end.