Integrated high-efficiency heat exchanger

Abstract

The application relates to an integrated high-efficiency heat exchanger, which comprises a first sample water inlet, a first sample water outlet, a second sample water inlet, a second sample water outlet, a cooling water inlet, a type-I heat exchanger, a type-II heat exchanger and a cooling water outlet; the type-I heat exchanger is a single double-pipe heat exchanger; the type-II heat exchanger is a combined heat exchanger with a single-pipe heat exchanger and a double-pipe heat exchanger arranged above and below respectively; an inner lining pipe is arranged in communication between the interiors; flanges are arranged on the upper part and the lower part, and a partition plate with an annular groove is arranged in the middle; an outer wall is arranged on the outer side, single pipes and double pipes are arranged between the inner lining pipe and the outer wall, and the components are threadedly connected through fasteners; sample water enters from the first sample water inlet, is pre-cooled directly through the single pipes to the bottom of the pipes, is turned back along the single pipes to be cooled for the first time, is discharged from the first sample water outlet, is introduced into the second sample water inlet through a pipeline, flows along the outer pipe of the double pipes, flows into the inner pipe to be cooled for the second and third times, and is discharged from the second sample water outlet.

Description

Technical Field

[0001] This invention relates to integrated, high-efficiency heat exchangers, belonging to the field of coil cooling technology for hot and cold alternation between cooling water and sample water, and particularly to integrated, high-efficiency heat exchangers. Background Technology

[0002] In process industries such as power generation, petrochemicals, and pharmaceuticals, online water quality analyzers are crucial for achieving precise process control, ensuring safe equipment operation, and meeting environmental emission standards. These instruments require continuous and stable acquisition of representative process water samples. However, directly introducing high-temperature process fluids into the instruments can lead to sensor thermal damage, measurement inaccuracies, and even permanent failures. Coil-type cooling heat exchangers (hereinafter referred to as coolers), as the core support unit of the instrument sampling pretreatment system, are responsible for rapidly and efficiently reducing high-temperature sample water (typically above 80°C) to the instrument's safe operating temperature range (typically 5-40°C). Their working principle is based on heat transfer, allowing high-temperature sample water to flow through the internal coils while the external cooling medium (often industrial circulating water) flows counter-currently in the shell side, achieving efficient heat exchange through the metal tube walls. Crucially, this design ensures complete isolation between the sample water and the cooling medium, eliminating the risk of cross-contamination. This protects the sensitive elements of the analyzer from high-temperature shocks and maintains the authenticity of the sample water composition, forming the cornerstone of ensuring the reliability of online monitoring data.

[0003] Traditional steam and water sampling equipment typically employs a combination of single-layer and double-layer cooling, assembled into one or two coolers. These coolers are installed below the sample water inlet pipe, positioned before or after the sampling frame. Traditional high-temperature frames lack external high-temperature protection, increasing the risk of burns during equipment setup and operation. Furthermore, the high-temperature, high-pressure sample water pipes in traditional coolers are primarily constructed using welding, leading to difficulties in installation, removal, and maintenance if a pipe bursts, requiring replacement of the entire cooler. Despite their indispensable role, the widely used coil-type cooling heat exchangers have revealed a series of significant technical defects in long-term engineering practice and operation, severely restricting system reliability, maintenance efficiency, and operational economy, necessitating innovative solutions.

[0004] First, the rigid welded structure results in extremely poor maintainability, leading to a sharp increase in maintenance costs and downtime losses.

[0005] Traditional coolers typically employ permanent welded connections on the inlet and outlet pipes of the sample water system. While this rigid connection prioritizes initial sealing reliability, it introduces significant risks for future maintenance. If the sample water pipeline experiences coil rupture or weld leakage (pipe burst) due to water hammer, media corrosion, thermal stress fatigue, or unexpected overpressure, the repair process becomes exceptionally complex and expensive. Repair personnel must use flame cutting or plasma cutting equipment to carefully cut away the faulty pipe section or damage the weld joint within a confined operating space. This process is not only time-consuming and labor-intensive (usually requiring several hours or even longer), but also involves hot work. In flammable, explosive, or sensitive process areas, strict isolation, purging, gas detection, and hot work permit procedures must be followed, significantly extending system downtime. After repair, high-standard weld restoration and X-ray or dye penetrant testing are required to ensure weld quality. Statistics show that the average downtime caused by such repairs can reach 8-24 hours, far exceeding the repair time designed for quick-replacement components. Furthermore, the high labor costs of specialized welding equipment and skilled welders, as well as the potential production fluctuations or quality risks caused by interruptions in instrument analysis, constitute a heavy burden of comprehensive maintenance and operating costs. This "repair is destruction" model runs counter to the modern industrial equipment's pursuit of modularity and rapid maintenance.

[0006] II. Separate combination of single / dual disc coolers: bulky structure, inefficient installation, and limited maintenance space.

[0007] To meet specific cooling load requirements (such as high flow rates or extremely high inlet temperatures), traditional solutions often use two completely independent physical units, a "single-disc cooler" and a "dual-disc cooler," connected in series or parallel. This seemingly simple stacking method has led to numerous drawbacks in practical engineering applications:

[0008] 1. Significantly increased footprint and inefficient space utilization: Two independent cooler bodies, their respective support frames, and the complex piping (including valves and fittings) connecting them and the front and rear ends of the system occupy a large amount of valuable space in the sampling rack or equipment room. In installations where space is already limited (such as compact power plant sampling rooms or offshore platforms), this layout often becomes a design bottleneck.

[0009] 2. Increased Installation Complexity and Difficulty: Installers need to precisely position two independent heat exchanger units of considerable weight and volume within a limited space, and complete multiple (usually at least four) sets of high-precision butt welds or flange connections between them and the system piping. This not only demands extremely high skill levels from the installers but also greatly increases the risk of pipe stress due to positioning errors, potentially leading to leaks in long-term operation. The installation cycle is significantly extended.

[0010] 3. Deteriorated accessibility for maintenance: When a cooler (especially the inner or lower unit) needs to be inspected, cleaned, or replaced, its adjacent cooler and connecting piping often pose a serious obstacle. The disassembly space is extremely limited, usually requiring the removal of peripheral equipment or piping first, and sometimes even the use of hoisting equipment, making what should be a relatively simple maintenance task time-consuming, labor-intensive, and risky (such as damaging adjacent instrument lines).

[0011] 4. Increased pressure drop and energy consumption: When arranged in series, the sample water needs to flow continuously through the coil channels of two heat exchangers, resulting in a significant increase in the overall system flow resistance (pressure drop). This may not only increase the load and energy consumption of the front-end sampling pump, but may even lead to insufficient flow in gravity flow systems.

[0012] III. Single-point vulnerability in tandem configurations: Reduced system reliability and increased security risks

[0013] In the common "single-disc + double-disc" series cooling scheme, high-temperature sample water must flow through these two series-connected cooler units sequentially. This architecture has a fatal weakness: if any cooling unit (whether single-disc or double-disc) fails (e.g., internal coil blockage, severe scaling leading to a sharp drop in heat exchange efficiency, coil leakage, or external connection failure), the entire cooling chain is interrupted. Even if the other cooler functions properly, it cannot independently cool the sample water to a safe temperature. The consequences are extremely serious:

[0014] 1. Risk of instrument exposure to high temperatures: High-temperature sample water that has not been adequately cooled will directly impact downstream precision analytical instruments (such as pH meters, conductivity meters, turbidity meters, dissolved oxygen sensors, etc.). This can easily cause irreversible damage such as damage to sensor sensitive membranes, failure of reference electrodes, scaling or deformation of optical windows, and overheating of electronic components, leading to the scrapping of expensive instruments.

[0015] 2. Measurement Interruptions and Production Control Inaccuracies: Instrument malfunctions or forced shutdowns to avoid further damage mean that real-time monitoring of critical water quality parameters (such as boiler water / steam quality, circulating water corrosivity, and effluent compliance) is interrupted. The lack of reliable data leads to inaccurate process adjustments, which can range from affecting product quality and yield to potentially accelerating equipment scaling and corrosion, deteriorating steam quality leading to turbine damage, and even triggering environmental accidents.

[0016] 3. The contradiction between the urgency and difficulty of maintenance is prominent: The failure of one unit in a series system paralyzes the entire cooling function, making maintenance an extremely urgent task. However, as mentioned earlier, in the compact and interconnected discrete assembly structure, disassembling and replacing the failed unit is precisely the most difficult part. This contradiction of "urgent need for repair" yet "difficulty in repair" significantly prolongs the duration of the system's unreliable state, greatly reducing the overall availability and safety level of the equipment. In addition, the risk of operational errors during emergency maintenance also increases accordingly.

[0017] In summary, existing coil-type cooling heat exchanger technology, limited by its rigid connection, discrete assembly, and series-dependent design paradigm, suffers from inherent and insurmountable defects in maintainability, space efficiency, ease of installation, and, crucially, system reliability. These issues directly increase the overall lifecycle maintenance costs, raise the risk of instrument damage, and may pose potential threats to the stability, safety, and environmental compliance of production processes. Therefore, the industry urgently needs an innovative cooler design that can completely resolve the three major pain points of poor maintainability, bulky structure, complex installation, and high single-point failure risk, while ensuring the core functions of efficient cooling and strict isolation, in order to meet the increasingly stringent requirements of modern, intelligent, and high-efficiency industrial operations for critical online analysis and assurance systems. Summary of the Invention

[0018] The purpose of this invention is to provide an integrated high-efficiency heat exchanger, which is energy-saving, highly efficient, and easy to maintain. It abandons the traditional single and double coil cooler design and manufacturing process, and is designed as a completely new integrated high-efficiency heat exchanger. The integrated heat exchanger can be disassembled into a single-stage cooler. Compared with traditional welded coolers, the threaded connection used in this invention not only facilitates quick assembly and disassembly of the heat exchanger but also reduces the risk of tube rupture caused by poor welding. Specifically, through primary pre-cooling and tertiary cooling of the overheated sample water internally, it solves both the problems of inadequate cooling and low cooling efficiency. Furthermore, due to its special structural design, it is easy to assemble and disassemble. Specifically, the connection method of the heat exchanger has been significantly improved, changing from the original welding process to a threaded connection, greatly simplifying the maintenance and disassembly process. This improvement allows for quick and convenient repair or replacement of components in the event of a heat exchanger failure, significantly improving the maintenance efficiency and safety of the heat exchanger.

[0019] This invention provides an integrated high-efficiency heat exchanger, comprising: a first sample water inlet (15), a first sample water outlet (16), a second sample water inlet (17), a second sample water outlet (18), a cooling water inlet (19), a type I heat exchanger, a type II heat exchanger, and a cooling water outlet (20); wherein the type I heat exchanger and the type II heat exchanger are arranged side by side, the type I heat exchanger is a single double-coil heat exchanger; the type II heat exchanger is a combined heat exchanger with a single-coil heat exchanger and a double-coil heat exchanger at the top and bottom respectively; the type I heat exchanger... The integrated high-efficiency heat exchanger is connected to the interior of the Type I and Type II heat exchangers by an inner liner tube (23); the upper and lower parts of the integrated high-efficiency heat exchanger are both equipped with flanges (21), and a partition plate (4) with an annular groove is provided in the middle; cooling water enters the Type I and Type II heat exchangers through the cooling water inlet (19), fills the inner liner tube (23), and then continues to rise, passing through the partition plate (4), and finally exits from the cooling water outlet (20); the inner side of the integrated high-efficiency heat exchanger is equipped with an inner liner tube (23), and the outer side of the integrated high-efficiency heat exchanger is equipped with a... An outer wall (22) is provided, and a single coil (3) and a double coil (5) are provided between the inner liner tube (23) and the outer wall (22). The single coil (3) is used to form the single coil heat exchanger of the type II heat exchanger, and the double coil (5) is used to form the single double coil heat exchanger of the type I heat exchanger and the double coil heat exchanger of the type II heat exchanger. The type I heat exchanger, the type II heat exchanger, the inner liner tube (23) and the partition plate (4) are connected together by fasteners (10) threaded together. The sample water enters from the first sample water inlet (15). The sample water is pre-cooled after passing through the single coil (3) to the bottom of the coil. Since the bottom is sealed, the sample water flows upward along the single coil (3) and then back to the bottom for the first cooling. It is then discharged from the first sample water outlet (16) and introduced into the second sample water inlet (17) through the pipeline. It flows along the outer coil of the double coil (5) and continues to flow into the inner coil of the double coil (5). The sample water is cooled a second time when it flows through the outer coil and a third time when it flows through the inner coil. Finally, it is discharged from the second sample water outlet (18).

[0020] Preferably, the flange (21) is a standard flange, a welding neck flange, a socket welding flange, a threaded flange, a sliding flange, a slip flange, a blind flange, a flat flange, a flange with a raised face, or a flange with a tongue and groove face.

[0021] Preferably, the fastener includes a screw (6) and a nut (24) that cooperate with each other, and the middle section of the screw (6) is provided with a pair of flat grooves to facilitate fastening.

[0022] Preferably, the integrated high-efficiency heat exchanger has a first cavity A, a second cavity B, a third cavity C, a fourth cavity D, a fifth cavity E, and a sixth cavity F. The single coil (3) is disposed in the sixth cavity F, the outer coil of the double coil (5) is disposed in the first cavity A, and the inner coil of the double coil (5) is disposed in the third cavity C. The cooling water enters from the cooling water inlet (19), and the cooling water inside the heat exchanger flows sequentially through the first cavity A and the second cavity B of the double coil heat exchanger, then flows from the third cavity C through the fourth cavity D into the single coil, and then flows sequentially from the fourth cavity D through the fifth cavity E and the sixth cavity F, and finally flows out from the cooling water outlet (20).

[0023] Preferably, the high-temperature sample water coil and the external sample water pipe are connected to the integrated high-efficiency heat exchanger through a connecting assembly. The connecting assembly includes a high-pressure sample water ball quick-connect fitting and a cooling water sealing assembly. The high-pressure sample water ball quick-connect fitting has a sleeve (9) and an inner core (7). The sleeve (9) is welded to the high-temperature sample water coil, and the inner core (7) is welded to the external sample water pipe. Thus, when the sleeve (9) is separated from the fastener (10), the high-temperature sample water coil can be detached from the flange along with the cooling water sealing assembly and the sleeve (9). The Type I heat exchanger, Type II heat exchanger, inner liner (23), and partition (4) are connected to the cooling water sealing assembly by threads.

[0024] Preferably, the cooling water sealing assembly includes a sealing joint (1) and a sealing element. The sealing element includes a PTFE gasket (13), an asbestos rope (12), and an asbestos rope plug (11). When a higher temperature sealing is required, the asbestos rope (12) is used for sealing. The PTFE gasket (13) is placed in the flange annular groove. By rotating the fastener (10), the outer wall (22), the partition (4), and the flange (21) jointly squeeze the PTFE gasket in the flange annular groove to seal. When the asbestos rope (12) is used for sealing, the asbestos rope (12) is placed in the sealing joint (1) and wrapped around the high-temperature sample water coil extending from the flange cover. At the same time, the asbestos rope (12) is placed between the asbestos rope plug (11) and the fixed seat (14). By squeezing the asbestos rope plug (11) to deform it, the asbestos rope (12) is indirectly squeezed, thereby forming a seal with the fixed seat (14) to achieve a high-temperature sealing effect.

[0025] Preferably, the flange (21) has an annular groove on its upper end face, and a through hole, two M27×1.5 threaded through holes and a first M85×2 threaded blind hole are respectively provided at the four corners of the same end face. A first 6-point pipe thread is provided in the middle of one side of the flange (21), and an M8 threaded hole is provided on each side of the first 6-point pipe thread. Two M8 threaded blind holes are left on the side of the flange. Two cross pan head screws are installed through the two M8 threaded blind holes. The integrated high-efficiency heat exchanger is hung on the C-shaped bracket of the sampling frame through the cross pan head screws. When the sleeve (9) of the high-pressure sample water ball quick connector is separated from the nut 24, it can be removed from the sampling frame or installed by lifting it up and down.

[0026] Preferably, an M16 threaded through hole is provided at each of the four corners of one end face of the partition (4), and a second 6-point pipe thread is provided in the middle of the same end face of the partition (4).

[0027] Preferably, one end of the inner liner tube (23) is provided with a second M85×2 thread, and the inner liner tube (23) is fastened to the flange (21) by the second M85×2 thread.

[0028] Preferably, the cooling water pipe in the integrated high-efficiency heat exchanger is a 6-point single-ended thread, which is fastened to the flange (21) by thread.

[0029] The integrated high-efficiency heat exchanger of the present invention has the following beneficial effects:

[0030] (1) Except for the ball quick-connect fitting sleeve and the high-temperature sample water coil which are welded, all other connections and seals of the heat exchanger are threaded, which improves the design of the connections and seals. This allows the heat exchanger to be disassembled and assembled with simple tools without the need for professional welding equipment during maintenance. This is especially important for emergency repairs and quick replacement of parts.

[0031] (2) Two M8 threaded blind holes are provided on the flange side of the heat exchanger. Two cross pan head screws are installed here. The heat exchanger can be hung on the C-type bracket that is permanently installed on the sampling rack through the cross pan head screws. When the sleeve and nut of the ball quick-connect fitting are separated, the heat exchanger can be removed from the sampling rack or installed by lifting it up and down.

[0032] (3) Type II heat exchanger is a combination heat exchanger with a single coil heat exchanger on the top and a double coil heat exchanger on the bottom. Compared with traditional coolers, Type II heat exchanger saves more space and is easier to install, remove and maintain.

[0033] (4) Except for the sealing components, all other parts of the integrated high-efficiency heat exchanger are made of a combination of 304 stainless steel and 321 stainless steel, ensuring overall sealing and corrosion resistance. Its basic threaded connection design allows for easy disassembly and assembly during later inspection and maintenance, greatly improving maintenance efficiency and safety.

[0034] (5) Compared with traditional coolers, integrated high-efficiency heat exchangers have a larger outer wall diameter and better cooling effect. Therefore, the first-stage cooling of energy-saving high-efficiency coolers can replace the pre-cooling device of the sampling rack.

[0035] (6) To further improve cooling efficiency and resource utilization, the integrated high-efficiency heat exchanger of this invention is designed with a special cooling water circulation system. The cooling water is circulated four times in the system, each time through a different flow path. Specifically, the cooling water continuously flows into cavity 1 through the cooling water inlet of the dual-coil heat exchanger (the location of the cavity is detailed below). Figure 3 After cavity 1 is filled, cooling water flows to cavity 3, filling cavities 3 and 4. Then, cooling water flows through cavity 5 into cavity 6, finally filling cavity 6 before exiting from the cooling water outlet of the single-coil heat exchanger. During this flow process, the cooling water cools the sample water pipeline four times in cavities 6, 5, 1, and 3. This design optimizes the heat exchange efficiency of each region, ensuring maximum utilization of the cooling water and high heat exchange efficiency.

[0036] (7) The weld joints of the integrated high-efficiency heat exchanger are located on the outside of the panel. Compared to traditional coolers with weld joints on both sides, in the event of a tube rupture, the problem area can be quickly located and repaired or replaced. This design allows maintenance work to extend beyond the heat exchanger's interior, enabling maintenance personnel to directly access the weld joints without disassembling the entire device. Furthermore, the extensive use of threaded connections in the integrated high-efficiency heat exchanger makes it easier to assemble and disassemble. The special design of the connecting components between the sample water pipe and the heat exchanger further facilitates installation, removal, and maintenance. When maintenance is required, only the high-temperature sample water coil needs to be replaced. This design significantly simplifies the maintenance process and shortens maintenance time. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1This is a general diagram of the Type II heat exchanger of the present invention;

[0039] Figure 2 This is a general diagram of the connection assembly of the Type II heat exchanger of the present invention; wherein Figure 2 (a) is a schematic diagram of the high-pressure water sample spherical quick-connect connector. Figure 2 (b) is a schematic diagram of the cooling water sealing assembly;

[0040] Figure 3 This is a flow diagram of the cooling water and sample water in the Type II heat exchanger of the present invention;

[0041] Figure 4 This is a flow diagram of the inlet and outlet directions of the Type I heat exchanger of the present invention. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0045] This embodiment provides an integrated high-efficiency heat exchanger, including a first sample water inlet 15, a first sample water outlet 16, a second sample water inlet 17, a second sample water outlet 18, a cooling water inlet 19, a type I heat exchanger, a type II heat exchanger, and a cooling water outlet 20; wherein, the type I heat exchanger and the type II heat exchanger are arranged side by side, the type I heat exchanger is a single double-coil heat exchanger; the type II heat exchanger is a combined heat exchanger with a single-coil heat exchanger and a double-coil heat exchanger at the top and bottom respectively; the type I heat exchanger and The Type II heat exchanger has an internal liner tube 23 connecting the two parts; the integrated high-efficiency heat exchanger has flanges 21 at both the top and bottom, and a baffle 4 with an annular groove in the middle; cooling water enters the Type I and Type II heat exchangers through the cooling water inlet 19, fills the liner tube 23, and then continues to rise, passing through the baffle 4 and finally exiting from the cooling water outlet 20; the integrated high-efficiency heat exchanger has an inner liner tube 23 on its inner side and an outer liner tube 23 on its outer side. Wall 22, a single coil 3 and a double coil 5 are arranged between the inner liner tube 23 and the outer wall 22. The single coil 3 is used to form the single coil heat exchanger of the Type II heat exchanger, and the double coil 5 is used to form the separate double coil heat exchanger of the Type I heat exchanger and the double coil heat exchanger of the Type II heat exchanger. The Type I heat exchanger, the Type II heat exchanger, the inner liner tube 23 and the partition plate 4 are connected together by fasteners 10 for easy installation, removal and maintenance. Sample water enters from the first sample water inlet 15 and passes through... The sample water is pre-cooled by passing through the single coil 3 to the bottom of the coil. Since the bottom is sealed, the sample water flows upward along the single coil 3 and then back to undergo the first cooling before being discharged from the first sample water outlet 16. It is then introduced into the second sample water inlet 17 through the pipeline and flows along the outer coil of the double coil 5, continuing to flow into the inner coil of the double coil 5. The sample water undergoes a second cooling when flowing through the outer coil and a third cooling when flowing through the inner coil, and finally is discharged from the second sample water outlet 18.

[0046] In this embodiment, flange 21 is a method flange. Of course, those skilled in the art can set other flange forms as needed, such as weld neck flange, socket weld flange, threaded flange, sliding flange, slip flange, blind flange, etc. The surface of the flange can be a flat surface, or have a raised face and a tongue and groove face, all of which are within the protection scope of this invention.

[0047] In a preferred embodiment, the fastener includes a screw 6 and a nut 24 that cooperate with each other, and a pair of flat grooves are provided in the middle section of the screw 6 to facilitate fastening.

[0048] In this embodiment, the screw 6 is a blackened double-ended screw. Of course, those skilled in the art will readily realize that other appropriate forms of screws can also be used, all of which are within the protection scope of this invention.

[0049] In a preferred embodiment, the integrated high-efficiency heat exchanger has a first cavity A, a second cavity B, a third cavity C, a fourth cavity D, a fifth cavity E, and a sixth cavity F. The single coil 3 is disposed in the sixth cavity F, the outer coil of the double coil 5 is disposed in the first cavity A, and the inner coil of the double coil 5 is disposed in the third cavity C. Cooling water enters from the cooling water inlet 19, flows sequentially through the first cavity A and the second cavity B of the double coil heat exchanger, then flows through the third cavity C, through the fourth cavity D, and into the single coil. From the fourth cavity D, it flows sequentially through the fifth cavity E and the sixth cavity F, finally exiting from the cooling water outlet 20.

[0050] In a preferred embodiment, the high-temperature sample water coil and the external sample water pipe are connected to the integrated high-efficiency heat exchanger via a connecting assembly. The connecting assembly includes a high-pressure sample water spherical quick-connect fitting and a cooling water sealing assembly. The high-pressure sample water spherical quick-connect fitting has a sleeve 9 and an inner core 7. The sleeve 9 is welded to the high-temperature sample water coil, and the inner core 7 is welded to the external sample water pipe. Thus, when the sleeve 9 is separated from the fastener 10, the high-temperature sample water coil can be detached from the flange along with the cooling water sealing assembly and the sleeve 9. The Type I heat exchanger, Type II heat exchanger, inner liner 23, and partition 4 are connected to the cooling water sealing assembly by threads.

[0051] In a preferred embodiment, the cooling water sealing assembly includes a sealing joint 1 and a sealing element. The sealing element includes a PTFE gasket 13, an asbestos rope 12, and an asbestos rope plug 11. When a seal is required to withstand higher temperatures, the asbestos rope 12 is used for sealing. The PTFE gasket 13 is placed in the flange annular groove. By rotating the fastener 10, the outer wall 22, the partition 4, and the flange 21 jointly compress the PTFE gasket in the flange annular groove to achieve a seal. When the asbestos rope 12 is used for sealing, the asbestos rope 12 is placed in the sealing joint 1 and wrapped around the high-temperature sample water coil extending from the flange cover. At the same time, the asbestos rope 12 is placed between the asbestos rope plug 11 and the fixing seat 14. By compressing and deforming the asbestos rope plug 11, the asbestos rope 12 is indirectly compressed, thereby forming a seal with the fixing seat 14 to achieve a high-temperature sealing effect.

[0052] It should be noted that, Figure 1 The enlarged view C shows a schematic diagram of the sealing method between the outer wall 22 of the heat exchanger and the partition 4. The outer wall 22 of the heat exchanger and the partition 4 are sealed together by the screw 6 and the nut 24 pressing the PTFE gasket 13.

[0053] It should be noted that the PTFE gasket 13 is placed in the flange annular groove between the sealing joint 1 and the cover plate 2. By rotating the fastener, the outer wall 22 and the flange 21 are compressed together, thereby forming a seal between the sealing joint 1 and the cover plate 2. The asbestos rope 12 is placed between the asbestos rope plug 11 and the fixing seat 14. By rotating the fastener, the asbestos rope plug 11 compresses the asbestos rope 12, thereby forming a seal with the fixing seat 14.

[0054] In a preferred embodiment, the upper end face of the flange 21 is provided with the annular groove, and the four corners of the same end face are respectively provided with a through hole, two M27×1.5 threaded through holes and a first M85×2 threaded blind hole. A first 6-point pipe thread is provided in the middle of one side of the flange 21, and an M8 threaded hole is provided on each side of the first 6-point pipe thread. Two M8 threaded blind holes are provided on the side of the flange. Two cross-head screws are installed through the two M8 threaded blind holes. The integrated high-efficiency heat exchanger is hung on the C-shaped bracket of the sampling frame through the cross-head screws. When the sleeve 9 of the high-pressure sample water ball quick connector is separated from the nut 24, it can be lifted up and down to remove it from the sampling frame or install the integrated high-efficiency heat exchanger.

[0055] In a preferred embodiment, an M16 threaded through hole is provided at each of the four corners of one end face of the partition plate 4, and a second 6-point pipe thread is provided in the middle of the same end face of the partition plate 4.

[0056] In a preferred embodiment, one end of the inner liner tube 23 is provided with a second M85×2 thread, and the inner liner tube 23 is fastened to the flange 21 by the second M85×2 thread, which facilitates assembly and disassembly.

[0057] In a preferred embodiment, the cooling water pipe in the integrated high-efficiency heat exchanger is a 6-point single-ended thread, which is fastened to the flange 21 by the thread, making it easy to assemble and disassemble.

[0058] In a preferred embodiment, the integrated high-efficiency heat exchanger, except for the seals, is constructed entirely of 304 and 321 stainless steel, ensuring overall sealing and corrosion resistance. Its basic threaded connection design allows for easy disassembly and assembly during later inspections and maintenance, significantly improving maintenance efficiency and safety.

[0059] The sample water enters through the first sample water inlet 15, passes through the single coil 3 in the sixth chamber F, and reaches the bottom of the coil (where the sample water is pre-cooled). Since the bottom is sealed, the sample water flows upward along the coil in the fifth chamber E (where it undergoes the first cooling), and exits from the first sample water outlet 16. It is then introduced into the second sample water inlet 17 through a pipeline, flows along the outer coil of the double coil 5 in the first chamber A, and continues to flow into the inner coil of the double coil 5 in the third chamber C (where the sample water undergoes a second cooling as it flows through the inner coil and a third cooling as it flows through the outer coil), and finally exits from the second sample water outlet 18. The cooling water, following the principle of bottom inlet and top outlet, enters through the cooling water inlet 19. Inside the heat exchanger, the cooling water flows sequentially through the first chamber A and the second chamber B of the double coil heat exchanger, then through the third chamber C and the fourth chamber D into the single coil. From the fourth chamber D, it flows sequentially through the fifth chamber E and the sixth chamber F, and finally exits from the cooling water outlet 20. Based on the principle of heat exchange between cooling water and sample water, the heat exchanger cools the sample water during the convection process between the sample water and cooling water.

[0060] The integrable high-efficiency heat exchanger of this embodiment is shown in the cross-sectional view below. Figure 3 As shown, the sample water enters from the first sample water inlet 15, passes through the single coil 3 in the sixth chamber F, and reaches the bottom of the coil (where the sample water is pre-cooled). Since the bottom is sealed, the sample water flows upward along the coil in the fifth chamber E (undergoing the first cooling), and exits from the first sample water outlet 16. It is then introduced into the second sample water inlet 17 through a pipeline, flows along the outer coil of the double coil 5 in the first chamber A, and continues to flow into the inner coil of the double coil 5 in the third chamber C (where the sample water undergoes a second cooling as it flows through the outer coil and a third cooling as it flows through the inner coil), finally exiting from the second sample water outlet 18. Following the principle of bottom-in, top-out, the cooling water enters from the cooling water inlet 19. Inside the heat exchanger, the cooling water flows sequentially through the first chamber A and the second chamber B of the double coil heat exchanger, then through the third chamber C and the fourth chamber D into the single coil. From the fourth chamber D, it flows sequentially through the fifth chamber E and the sixth chamber F, finally exiting from the cooling water outlet 20. Based on the principle of heat exchange between cooling water and sample water, the heat exchanger cools the sample water during the convection process between the sample water and cooling water.

[0061] It should be noted that the inner liner tube 23 is connected inside the Type I heat exchanger and the Type II heat exchanger. Cooling water enters the heat exchanger through the cooling water inlet 19, fills the inner liner tube 23, and then the water level continues to rise. After passing through the baffle 4, it is finally discharged from the cooling water outlet 20.

[0062] It should be noted that, as Figure 2 (a) and Figure 2As shown in (b), the sleeve 9 of the ball quick-connect fitting is welded to the high-temperature sample water coil extending from the flange cover, and the inner core (7) is welded to the outer sample water pipe. When the sleeve 9 of the ball quick-connect fitting is separated from the nut 24, the high-temperature sample water coil can be removed from the flange along with the sealing assembly and the sleeve 9. The asbestos rope 12 in the sealing joint 1 is wrapped around the high-temperature sample water coil extending from the flange cover, and the sealing effect is achieved by the compression deformation of the asbestos rope plug 11.

[0063] It should be noted that, Figure 1 The enlarged view C shows a schematic diagram of the sealing method between the outer wall 22 of the heat exchanger and the partition 4. The outer wall 22 of the heat exchanger and the partition 4 are sealed together by the screw 6 and the nut 24 pressing the PTFE gasket 13.

[0064] It should be noted that the PTFE gasket 13 is placed in the flange annular groove between the sealing joint 1 and the cover plate 2. By rotating the fastener, the PTFE gasket 13 and the flange are compressed together, thereby forming a seal between the sealing joint 1 and the cover plate 2. The asbestos rope 12 is placed between the asbestos rope plug 11 and the fixing seat 14. By rotating the fastener, the asbestos rope plug 11 compresses the asbestos rope 12, thereby forming a seal with the fixing seat 14.

[0065] It should be noted that, under normal circumstances, the high-temperature sample water coil is made of φ10×1.5 pipe; in the case of semi-steam and semi-liquid conditions with a temperature above 100 degrees Celsius and a pressure less than 0.3MPa, the high-temperature sample water coil is made of φ14×2 pipe.

[0066] This type of integrated high-efficiency heat exchanger is suitable for applications requiring cooling of instrument measurement piping systems. If the high-temperature sample water coil is damaged, it can be removed and replaced by disassembling the ball-type quick-connect fitting.

[0067] Through the above description of the embodiments, those skilled in the art can clearly understand that the above embodiments can be implemented by software, or by using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions of the above embodiments can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, mobile hard drive, etc.), including several instructions to cause a computer device (such as a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated high-efficiency heat exchanger, characterized in that, include: First sample water inlet (15), first sample water outlet (16), second sample water inlet (17), second sample water outlet (18), cooling water inlet (19), type I heat exchanger, type II heat exchanger, and cooling water outlet (20); wherein, the type I heat exchanger and type II heat exchanger are arranged side by side, the type I heat exchanger is a single double-coil heat exchanger; the type II heat exchanger is a combination heat exchanger with a single-coil heat exchanger and a double-coil heat exchanger at the top and bottom respectively; the inner lining tubes of the type I heat exchanger and the type II heat exchanger are connected internally ( 23); The integrated high-efficiency heat exchanger is provided with flanges (21) at the top and bottom, and a baffle (4) with an annular groove is provided in the middle; Cooling water enters the type I and type II heat exchangers through the cooling water inlet (19), fills the inner liner tube (23), and then the water level continues to rise. After passing through the baffle (4), it is finally discharged from the cooling water outlet (20); The inner side of the integrated high-efficiency heat exchanger is provided with an inner liner tube (23), and the outer side of the integrated high-efficiency heat exchanger is provided with an outer wall (22). A single coil (3) and a double coil (5) are provided between the liner (23) and the outer wall (22). The single coil (3) is used to form the single coil heat exchanger of the Type II heat exchanger, and the double coil (5) is used to form the single double coil heat exchanger of the Type I heat exchanger and the double coil heat exchanger of the Type II heat exchanger. The Type I heat exchanger, the Type II heat exchanger, the liner (23) and the partition (4) are connected together by fasteners (10) threaded together. The sample water enters from the first sample water inlet (15) and passes through the single coil. The pipe (3) reaches the bottom of the coil to pre-cool the sample water. Since the bottom is sealed, the sample water flows upward along the single coil (3) and then turns back to cool for the first time. It is then discharged from the first sample water outlet (16) and introduced into the second sample water inlet (17) through the pipeline. It flows along the outer coil of the double coil (5) and continues to flow into the inner coil of the double coil (5). The sample water is cooled for the second time when it flows through the outer coil and for the third time when it flows through the inner coil. Finally, it is discharged from the second sample water outlet (18).

2. The integrated high-efficiency heat exchanger according to claim 1, characterized in that, Flange (21) is a standard flange, a welding neck flange, a socket welding flange, a threaded flange, a sliding flange, a slip flange, a blind flange, a flat flange, a flange with a raised face, or a flange with a tongue and groove face.

3. The integrated high-efficiency heat exchanger according to claim 2, characterized in that, The fastener includes a screw (6) and a nut (24) that cooperate with each other, and a pair of flat grooves are provided in the middle section of the screw (6) to facilitate fastening.

4. The integrated high-efficiency heat exchanger according to claim 3, characterized in that, The integrated high-efficiency heat exchanger has a first cavity A, a second cavity B, a third cavity C, a fourth cavity D, a fifth cavity E, and a sixth cavity F. The single coil (3) is located in the sixth cavity F, the outer coil of the double coil (5) is located in the first cavity A, and the inner coil of the double coil (5) is located in the third cavity C. The cooling water enters from the cooling water inlet (19), and the cooling water inside the heat exchanger flows sequentially through the first cavity A and the second cavity B of the double coil heat exchanger, then flows from the third cavity C through the fourth cavity D into the single coil, and then flows sequentially from the fourth cavity D through the fifth cavity E and the sixth cavity F, and finally flows out from the cooling water outlet (20).

5. An integrated high-efficiency heat exchanger according to claim 4, characterized in that, The high-temperature sample water coil and the external sample water pipe are connected to the integrated high-efficiency heat exchanger through a connecting assembly. The connecting assembly includes a high-pressure sample water ball quick-connect fitting and a cooling water sealing assembly. The high-pressure sample water ball quick-connect fitting has a sleeve (9) and an inner core (7). The sleeve (9) is welded to the high-temperature sample water coil, and the inner core (7) is welded to the external sample water pipe. Thus, when the sleeve (9) is separated from the fastener (10), the high-temperature sample water coil can be detached from the flange along with the cooling water sealing assembly and the sleeve (9). The Type I heat exchanger, Type II heat exchanger, inner liner (23), and partition (4) are connected to the cooling water sealing assembly by threads.

6. An integrated high-efficiency heat exchanger according to claim 5, characterized in that, The cooling water sealing assembly includes a sealing joint (1) and a sealing element. The sealing element includes a PTFE gasket (13), an asbestos rope (12), and an asbestos rope plug (11). When a higher temperature sealing is required, the asbestos rope (12) is used for sealing. The PTFE gasket (13) is placed in the flange annular groove. By rotating the fastener (10), the outer wall (22), the partition (4), and the flange (21) jointly squeeze the PTFE gasket in the flange annular groove to seal. When the asbestos rope (12) is used for sealing, the asbestos rope (12) is placed in the sealing joint (1) and wrapped around the high-temperature sample water coil extending from the flange cover. At the same time, the asbestos rope (12) is placed between the asbestos rope plug (11) and the fixed seat (14). By squeezing the asbestos rope plug (11) to deform it, the asbestos rope (12) is indirectly squeezed, thereby forming a seal with the fixed seat (14) to achieve a high-temperature sealing effect.

7. An integrated high-efficiency heat exchanger according to claim 6, characterized in that, The flange (21) has an annular groove on its upper end face. At the four corners of the same end face, there is a through hole, two M27×1.5 threaded through holes and a first M85×2 threaded blind hole. A first 6-point pipe thread is provided in the middle of one side of the flange (21). An M8 threaded hole is provided on each side of the first 6-point pipe thread. Two M8 threaded blind holes are left on the side of the flange. Two cross-head screws are installed through the two M8 threaded blind holes. The integrated high-efficiency heat exchanger is hung on the C-shaped bracket of the sampling frame through the cross-head screws. When the sleeve (9) of the high-pressure sample water ball quick-connect connector is separated from the nut 24, it can be removed from the sampling frame or installed by lifting it up and down.

8. An integrated high-efficiency heat exchanger according to claim 7, characterized in that, An M16 threaded through hole is provided at each of the four corners of one end face of the partition (4), and a second 6-point pipe thread is provided in the middle of the same end face of the partition (4).

9. An integrated high-efficiency heat exchanger according to claim 8, characterized in that, One end of the inner liner tube (23) is provided with a second M85×2 thread, and the inner liner tube (23) is fastened to the flange (21) by the second M85×2 thread.

10. An integrated high-efficiency heat exchanger according to claim 9, characterized in that, The cooling water pipe inside the integrated high-efficiency heat exchanger is a 6-point single-ended thread, which is fastened to the flange (21) by thread.

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