Split type phase change heat exchanger with tube bundle capable of being rapidly replaced

Abstract

The utility model provides a split type phase change heat exchanger with a tube bundle capable of being rapidly replaced. The split type phase change heat exchanger comprises a hot fluid heat exchanger, a cold fluid heat exchanger and a connecting tube. The connecting pipe comprises a steam ascending pipe and a condensate return pipe; the hot fluid heat exchanger is an evaporation section of a working medium in the tube bundle; the cold fluid heat exchanger is a condensation section of a working medium in the heat exchange tube bundle; the evaporation section and the condensation section of each heat exchange tube bundle are connected through a steam ascending tube and a condensate backflow tube to form a circulation loop. The cold fluid heat exchange tube bundle and the hot fluid heat exchange tube bundle of the split type phase change heat exchanger can be replaced simply and quickly, the maintenance time is shortened, and the installation and maintenance cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery and utilization, in particular to a split type phase-change heat exchanger with quick pipe bundle replacement. BACKGROUND

[0002] The split type phase-change heat exchanger is a high-efficiency heat exchange device, which realizes heat transfer through phase change of a working medium, has extremely high thermal conductivity, good isothermality, long-distance heat transfer, controllable temperature and a series of advantages. The split type heat exchanger is composed of a hot fluid heat exchanger and a cold fluid heat exchanger. The hot fluid heat exchanger and the cold fluid heat exchanger are each provided with a plurality of heat exchange pipe bundles. The heat exchange pipe bundles are filled with circulating working medium. The hot fluid heat exchanger is an evaporation section of the circulating working medium. The cold fluid heat exchanger is a condensation section of the circulating working medium. The evaporation section and the condensation section of each heat exchange pipe bundle are connected into a circulating loop through steam riser pipes and condensate return pipes. Through evaporation and condensation of the working medium, the purpose of heat exchange between the cold fluid and the hot fluid is achieved.

[0003] In the steel industry, in view of the characteristics and advantages of the split type phase-change heat exchanger, the split type phase-change heat exchanger plays a very active role in waste heat utilization of hot working equipment such as blast furnace hot blast furnace and gas boiler. The application scenarios mainly include a flue gas-gas heat exchanger (hot fluid: flue gas; cold fluid: gas) and a flue gas-air heat exchanger (hot fluid: flue gas; cold fluid: air). Since the blast furnace gas contains ash, corrosive gases such as HCl, H2S, SO2 and SO3, and corrosive components such as S 2- , SO3 2- , SO4 2- , Cl - , etc. in the mechanical water, the problems of ash deposition and corrosion of the gas heat exchanger pipe bundle are inevitable. For the flue gas side, although the degree of pipe bundle corrosion and ash deposition is relatively light compared with the gas pipe bundle, there are still pipe bundle ash deposition and low-temperature dew point corrosion phenomena.

[0004] Therefore, the flue gas heat exchanger and the gas heat exchanger need to be replaced according to the ash blockage and corrosion of the pipe bundle, and the frequency is relatively high. Since the corrosion part of the equipment is mainly the pipe bundle, in order to save the cost of the equipment and the cost of large-scale hoist required for hoisting the whole equipment, the pipe bundle replacement scheme has become more and more common.

[0005] However, the structure of the conventional cold / hot fluid heat exchange equipment has the problems of large cutting workload of the upper cover plate part, serious damage of the upper cover plate due to cutting, long time consumption for repair and recovery after installation of the pipe bundle. At the same time, the crane occupies a long time and a large space, and the cost of the site is high.

[0006] Therefore, it is urgent to take effective measures to solve the above problems. CONTENT OF THE INVENTION

[0007] The application provides a quick replacement split phase-change heat exchanger for tube bundles, which can be used to solve the problems of great difficulty, long time consumption and high cost in heat exchanger replacement and maintenance.

[0008] The quick replacement split phase-change heat exchanger for tube bundles comprises:

[0009] a hot fluid heat exchanger, a cold fluid heat exchanger and a connecting pipe;

[0010] The connecting pipe comprises a steam rising pipe and a condensate backflow pipe.

[0011] The hot fluid heat exchanger is an evaporation section of a working medium in a tube bundle, and the cold fluid heat exchanger is a condensation section of the working medium in the heat exchange tube bundle.

[0012] The evaporation section and the condensation section of each heat exchange tube bundle are connected into a circulation loop through the steam rising pipe and the condensate backflow pipe.

[0013] Further, the hot fluid heat exchanger comprises a heat exchanger shell, a plurality of single-piece tube bundle modules, sealing gaskets and fasteners for installing a cover plate.

[0014] The plurality of single-piece tube bundle modules are arranged in order inside a cavity of the hot fluid heat exchanger and are arranged on a tube bundle support frame.

[0015] Each single-piece tube bundle module is independent of each other, and is not connected to each other.

[0016] The arrangement spacing of the single-piece tube bundle modules in the shell is adapted to the extraction and installation space of each single-piece tube bundle module.

[0017] Further, the single-piece tube bundle module comprises a single-piece tube bundle, a cover plate strip, a connecting flange, an upper expansion joint, a tube bundle upper lead-out pipe and a tube bundle lower lead-out pipe.

[0018] The cover plate strip is arranged above the single-piece tube bundle, and the cover plate strip and the heat exchanger shell are connected through the fasteners and the sealing gaskets.

[0019] The tube bundle upper lead-out pipe penetrates through the cover plate strip, and an expansion joint is arranged between the tube bundle upper lead-out pipe and the cover plate strip.

[0020] The connecting flange is arranged on both sides of the cover plate strip, and the adjacent independent single-piece tube bundle modules are connected through the fasteners and the sealing gaskets.

[0021] The tube bundle upper lead-out pipe of the single-piece tube bundle module is connected with the steam rising pipe, and the lower lead-out pipe of the single-piece tube bundle module is connected with the condensate backflow pipe.

[0022] Further, the top surface of the heat exchanger shell is a shell sealing surface for installing each single-piece tube bundle module.

[0023] Further, the monolithic tube bundle module is provided with a lower expansion joint at the position of the tube bundle lower part.

[0024] Further, the top of the heat fluid heat exchanger is further provided with a tube bundle lifting steel frame;

[0025] The top end of the tube bundle lifting steel frame is provided with a track; the lifting hoist can move to the corresponding position on the track.

[0026] The application realizes simple and fast replacement of the cold and heat fluid heat exchange tube bundle of the split type phase change heat exchanger, shortens the maintenance time, and saves the installation and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The split type phase change heat exchanger provided for the embodiment of the application is shown in the schematic diagram;

[0028] Figure 2 The working medium circulation of the cold and heat fluid heat exchange tube bundle of the split type phase change heat exchanger provided for the embodiment of the application is shown in the schematic diagram;

[0029] Figure 3 The front view of the tube bundle quick replacement split type phase change heat exchanger is shown in the schematic diagram, taking the flue gas heat exchanger as an example;

[0030] Figure 4 The left view of the split type phase change heat exchanger provided for the embodiment of the application is shown in the schematic diagram;

[0031] Figure 5 The top view of the split type phase change heat exchanger provided for the embodiment of the application is shown in the schematic diagram;

[0032] Figure 6 The schematic diagram of the flue gas heat exchanger provided for the embodiment of the application is shown in the schematic diagram;

[0033] Figure 7 The schematic diagram of the monolithic tube bundle module provided for the embodiment of the application is shown in the schematic diagram;

[0034] Figure 8 The schematic diagram of the monolithic tube bundle module provided for the embodiment of the application is shown in the schematic diagram.

[0035] The meanings of the reference signs are as follows:

[0036] 100. Hot fluid heat exchanger; 110. Heat exchanger shell; 120. Single tube bundle module; 121. Single tube bundle; 122. Cover strip; 123. Connecting flange; 124. Upper expansion joint; 125. Upper tube bundle outlet pipe; 126. Lower outlet pipe; 130. Sealing gasket; 140. Fastener; 150. Lower expansion joint; 160. Tube bundle support frame; 170. Shell sealing surface; 200. Cold fluid heat exchanger; 300. Steam riser pipe; 400. Condensate return pipe; 500. Tube bundle lifting steel frame; 600. Guide rail; 700. Lifting hoist. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0038] See Figures 1 to 2 This utility model relates to a split-type phase change heat exchanger, comprising a hot fluid heat exchanger 100, a cold fluid heat exchanger 200, and connecting pipes. The connecting pipes include a steam riser 300 for the working fluid and a condensate return pipe 400. The hot fluid heat exchanger 100 is the evaporation section of the working fluid within the tube bundle; the cold fluid heat exchanger 200 is the condensation section of the working fluid within the heat exchange tube bundle. The evaporation and condensation sections of each heat exchange tube bundle are connected to form a circulation loop via the steam riser 300 and the condensate return pipe 400, achieving heat exchange between the hot and cold fluids through the evaporation and condensation of the working fluid.

[0039] For ease of explanation, this embodiment uses a heat exchanger in a split phase change heat exchanger for illustration. Specifically, it uses a flue gas heat exchanger with two tube rows in a single heat exchange tube bundle as an example.

[0040] See Figures 3 to 5 The present invention provides a tube bundle quick-change split phase change heat exchanger (taking a flue gas heat exchanger as an example), including a flue gas heat exchanger 100, a tube bundle lifting steel frame 500, a track 600, and a lifting hoist 700; the track 600 is set at the top of the tube bundle lifting steel frame 500; the lifting hoist 700 moves to the corresponding position on the track 600.

[0041] See Figures 6 to 8 The flue gas heat exchanger 100 includes a heat exchanger housing 110, several single-piece tube bundle modules 120, a sealing gasket 130, and fasteners 140 for cover plate mounting.

[0042] Several single-piece tube bundle modules 120 are neatly arranged inside the cavity of the flue gas heat exchanger 100 and supported on the tube bundle support frame 160. Each single-piece tube bundle module is independent of the others, with limits between modules and no connection between them; the spacing of the single-piece tube bundle modules 120 within the housing is adapted to the extraction and installation space of each single tube bundle, ensuring unobstructed operation. The upper lead-out pipe 125 of the single-piece tube bundle module 120 is connected to the steam riser pipe 300; the lower lead-out pipe 126 of the single-piece tube bundle module 120 is connected to the condensate return pipe 400.

[0043] The single-piece tube bundle module 120 includes a single-piece tube bundle 121, a cover strip 122, a connecting flange 123, an upper expansion joint 124, an upper tube bundle outlet pipe 125, and a lower tube bundle outlet pipe 126.

[0044] The cover strip 122 is located above the single tube bundle 121 and is connected to the heat exchanger shell 110 via fasteners 140 and gaskets 130, thus isolating the fluid inside the equipment from the outside. The upper tube bundle outlet pipe 125 passes through the cover strip 122, and an expansion joint 124 is provided between the upper tube bundle outlet pipe 125 and the cover strip 122 to ensure that the heat exchange tubes can expand freely inside the shell. The connecting flanges 123 are located on both sides of the cover strip 122 and are connected to adjacent independent single tube bundle modules 120 via fasteners 140 and gaskets 130, thereby achieving a sealing effect.

[0045] The heat exchanger housing 110 is used to install and support each single tube bundle module 120. The top surface of the heat exchanger housing 110 is the housing sealing surface 170 for installing each single tube bundle module 120, so as to achieve a sealing effect between the cover strip 122 of each single tube bundle module and the housing.

[0046] See Figures 3 to 8 When it is necessary to replace the single tube bundle 121, the fasteners 140 and sealing gaskets 130 on the cover plate 122 can be easily removed. At the same time, the connection between the upper lead-out pipe 125 of the single tube bundle module 120 and the steam riser pipe 300, and the connection between the lower lead-out pipe 126 of the single tube bundle module 120 and the housing and condensate return pipe 400 can be disconnected. The old tube bundle can then be quickly and smoothly removed, and the new single tube bundle 121, cover plate 122, and upper expansion joint 124 can be installed. The connections between the upper lead-out pipe 125 and the lower lead-out pipe 126 of the tube bundle and the steam riser pipe 300 and condensate return pipe 400, respectively, can be restored. Finally, the sealing gaskets 130 and fasteners 140 are used to seal the connection, making the tube bundle replacement convenient and quick.

[0047] In addition, according to project requirements, after the single tube bundle module 120 is installed, a lower expansion joint 150 can be set at the lower outlet pipe 126 of the tube bundle to absorb the expansion displacement of the lower part of the tube bundle. This is only applicable when the displacement of the lower part of the tube bundle is large.

[0048] To save crane usage time and reduce the footprint at the installation site, this invention includes a tube bundle lifting steel frame 500 above the flue gas heat exchanger. The top steel beam of the frame is equipped with a rail 600 and a lifting hoist 700. The disassembly and installation of the tube bundle are both achieved using the electric lifting hoist 700 and the rail 500. The height of the top beam of the lifting steel frame 500 and the width of the frame columns meet the space requirements for lifting and relocating the heat exchange tube bundle.

[0049] To ensure that the electric hoist 700 can smoothly reach the top of the tube bundles stacked on the ground while simultaneously facilitating tube bundle disassembly and installation, the path design of the lifting steel frame 500 and the track 600 takes this into full consideration. The guide rail is curved and suspended above the heat exchanger area according to the specific site conditions, facilitating the hoist's access to the top of the tube bundles stacked on the ground. See details... Figures 3 to 5 .

[0050] This invention enables simple and quick replacement of the cold / hot fluid heat exchange tube bundles in a split phase change heat exchanger, shortening maintenance time and saving installation and maintenance costs.

[0051] The above embodiments only describe the flue gas heat exchanger in the split phase change heat exchanger. For other heat exchangers in the split phase change heat exchanger, including cold fluid heat exchangers or hot fluid heat exchangers, where the medium is air, coal gas or other, if the same technical solution is implemented as described in the above embodiments, the technical solution falls within the protection scope of this utility model.

[0052] It should be noted that for gas heat exchangers, after the heat exchange tube bundle is replaced, the sealing method between the cover plates and between the cover plates and the shell can be changed to a welding type to ensure the sealing performance of the equipment. This technical solution also falls within the protection scope of this utility model.

[0053] The above embodiments are merely preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and equivalent substitutions can be made without departing from the principle of this utility model (for example, changing the number of tube bundles in a single tube bundle, connecting the tube bundle hoisting steel frame of the cold / hot heat exchanger fluid to the track, etc.). These technical solutions after improving and equivalently substituting the claims of this utility model all fall within the protection scope of this utility model.

Claims

1. A split-type phase change heat exchanger with quick tube bundle replacement, characterized in that, The split-type phase change heat exchanger includes: Hot fluid heat exchanger (100), cold fluid heat exchanger (200) and connecting pipes; The connecting pipes include a steam riser pipe (300) and a condensate return pipe (400); The hot fluid heat exchanger (100) is the evaporation section of the working fluid inside the tube bundle; the cold fluid heat exchanger (200) is the condensation section of the working fluid inside the heat exchange tube bundle. The evaporation and condensation sections of each heat exchange tube bundle are connected to form a circulation loop through a steam riser (300) and a condensate return pipe (400); The heat exchanger (100) includes a heat exchanger housing (110), several monolithic tube bundle modules (120), a sealing gasket (130), and fasteners (140) for mounting a cover plate. Several single-piece tube bundle modules (120) are neatly arranged inside the cavity of the heat exchanger (100) and mounted on the tube bundle support frame (160); Each individual tube bundle module is independent of the others, and there are limit switches between the individual tube bundle modules so that they are not connected to each other; The spacing of the single-piece tube bundle modules (120) arranged in the housing is adapted to the extraction and installation space of each single-piece tube bundle module.

2. The split-type phase change heat exchanger according to claim 1, characterized in that, The single-piece tube bundle module (120) includes a single-piece tube bundle (121), a cover strip (122), a connecting flange (123), an upper expansion joint (124), an upper tube bundle outlet pipe (125), and a lower tube bundle outlet pipe (126); The cover strip (122) is disposed above the single tube bundle (121), and the cover strip (122) is connected to the heat exchanger shell (110) by fasteners (140) and sealing gaskets (130). The upper lead-out pipe (125) of the tube bundle passes through the cover strip (122), and an expansion joint (124) is provided between the upper lead-out pipe (125) of the tube bundle and the cover strip (122); Connecting flanges (123) are located on both sides of the cover strip (122), and adjacent independent single-piece tube bundle modules (120) are connected by fasteners (140) and sealing gaskets (130); The upper lead-out pipe (125) of the single-piece tube bundle module (120) is connected to the steam riser pipe (300); the lower lead-out pipe (126) of the single-piece tube bundle module (120) is connected to the condensate return pipe (400).

3. The split-type phase change heat exchanger according to claim 2, characterized in that, The top surface of the heat exchanger shell (110) is the shell sealing surface (170) for installing each single tube bundle module (120).

4. The split-type phase change heat exchanger according to claim 1, characterized in that, The top of the heat exchanger (100) is also equipped with a tube bundle lifting steel frame (500); The top of the tube bundle lifting steel frame (500) is provided with a track (600); the lifting hoist (700) can move to the corresponding position on the track (600).

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