Compound connection structure of heat exchanger

Abstract

Provided in the present disclosure is a compound connection structure of a heat exchanger, the compound connection structure comprising a compound connection structure I, wherein three to six vertical layers of steam heat exchangers are connected in single-row series, and are in communication with top steam drums, and N (N≥1) horizontal rows of single-row series-connected steam heat exchanger structures then constitute a parallel connection structure by means of a steam output main pipe; and the compound connection structure further comprising a compound connection structure II, wherein M (M≥3) horizontal rows of one-through heat exchangers are connected in series, and one to six vertical layers of interlayer series-connected one-through heat exchanger combined structures are then connected by means of the steam output main pipe to form a parallel structure. The compound connection structure, which comprises the compound connection structure I and the compound connection structure II in two series connection modes, simplifies the process system, and also greatly reduces control modules; in addition, the control logic is also improved and optimized. Moreover, the service life of heat exchange tubes of the heat exchanger structures is also greatly prolonged, and the occurrence of undesirable phenomena such as easy damage and easy clogging caused by excessively thin heat exchange tubes is avoided.

Description

Heat exchanger complex connection structure TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of solid electric heat storage, and particularly relates to a complex structure for connecting multiple unit heat exchangers in series. BACKGROUND

[0002] With more and more clean electric energy optimization utilization projects, solid electric heat storage equipment occupies a place in the heat storage industry with high cost performance, high stability and reliability, and is widely recognized by users. The main structure of the traditional solid electric heat storage equipment is composed of heat storage bodies and heat exchangers. In order to ensure the balance of heat storage and heat release in the equipment design, the basic heat storage bodies and heat exchangers are in a corresponding relationship. The matching number of the traditional small power (heat storage power ≤ 3 MW) is relatively small, and the use and control are relatively convenient. However, when the power is large or above 100 MW, the number of heat exchange modules is large, the control of the system is complicated, and the parallel structure of multiple heat exchange modules leads to a small cross section of the heat exchange pipes in the heat exchange modules, which causes damage and easy scaling and other adverse phenomena during long-term use. SUMMARY

[0003] In view of the above shortcomings of the prior art, the purpose of the present disclosure is to provide a heat exchanger complex connection structure, which aims to solve the problem that the large equipment in the prior art has too many corresponding heat exchange modules, leading to complicated control of the system, and the parallel structure of multiple heat exchange modules leads to a small cross section of the heat exchange pipes in the heat exchange modules, which causes damage and easy scaling and other adverse phenomena during long-term use.

[0004] In order to achieve the above purpose, the present disclosure adopts the following technical scheme:

[0005] A heat exchanger complex connection structure, comprising a complex connection structure one and a complex connection structure two; the complex connection structure one is a connection structure in which 3-6 vertical layers of steam heat exchangers are connected in series, and the top steam drum is connected, and N (N ≥ 1) horizontal rows of single-column series heat exchanger combination structures are connected in parallel through a steam output header, and the complex connection structure two comprises:

[0006] The heat storage body is made of refractory sintered bricks, has an internal structure integrating electric energy storage and heat energy release, is arranged on one side of the steam heat exchanger, and is connected with the steam heat exchanger;

[0007] The steam heat exchanger is made of metal finned tubes and is provided with a steam heat exchanger input pipe and a steam heat exchanger output pipe, is arranged on one side of the heat storage body, and is connected with the heat storage body;

[0008] The steam drum is arranged on the top of the vertical top layer of steam heat exchangers, and is connected with the top layer of steam heat exchanger output pipes through a connecting pipe;

[0009] lower header, placed at the bottom of vertical 3-6 layers of steam heat exchangers, connected with the input pipe of the first layer of steam heat exchangers through a connecting pipe, and connected with the steam drum through a descending pipe;

[0010] the second complex connection structure, which is a connection structure in which M (M≥3) columns of horizontal direct-current heat exchangers are connected in series, and then each layer of series direct-current heat exchanger combination structures of vertical 1-6 layers are connected in parallel through a steam output main pipe, and the second complex connection structure further comprises:

[0011] the heat accumulator, which is made of refractory sintered bricks, has an internal structure integrating electric energy storage and heat energy release, is placed on one side of the direct-current heat exchanger, and is connected with the direct-current heat exchanger;

[0012] the direct-current heat exchanger, which is made of metal finned tubes, is placed on one side of the heat accumulator, and is connected with the heat accumulator;

[0013] The direct-current heat exchanger comprises:

[0014] the primary heat exchanger, which is a low-temperature heat exchanger provided with a primary heat exchanger inlet and a primary heat exchanger outlet, and is arranged at the rear end of the secondary heat exchanger;

[0015] the secondary heat exchanger, which is a high-temperature heat exchanger provided with a secondary heat exchanger inlet and a secondary heat exchanger outlet, and is arranged at the front end of the primary heat exchanger, i.e. on the side close to the heat accumulator;

[0016] Further, the series combination structure of the first complex connection structure and the second complex connection structure further comprises:

[0017] the series steam heat exchanger combination structure, which is arranged in the first complex connection structure, is a combination structure in which the steam heat exchanger input pipe and the steam heat exchanger output pipe of vertical 3-6 layers of steam heat exchangers are connected in series through connecting pipes;

[0018] the series combination structure of direct-current heat exchangers, which is arranged in the second complex connection structure, is a combination structure in which M (M≥3) columns of horizontal adjacent direct-current heat exchangers in a horizontal layer are connected in series through connecting pipes, wherein the series connection mode is that the primary heat exchanger inlet of the first column of direct-current heat exchangers is connected with the primary heat exchanger outlet of the second column of direct-current heat exchangers, which is connected with the primary heat exchanger inlet of the Mth column of direct-current heat exchangers in the layer, and then the primary heat exchanger outlet of the Mth column of direct-current heat exchangers is connected with the secondary heat exchanger inlet, and the secondary heat exchangers are connected in reverse series according to the series connection mode of the primary heat exchangers, forming a combination structure in which the primary heat exchangers of the direct-current heat exchangers in the layer are connected in series first and then the secondary heat exchangers are connected in series. The total inlet of the combination structure is the primary heat exchanger inlet of the first column of direct-current heat exchangers, and the total outlet is the secondary heat exchanger outlet of the first column of direct-current heat exchangers;

[0019] Further, the heat exchanger complex connection structure further comprises:

[0020] The water supplement pump;

[0021] When arranged in the complex connection structure one, one end of the water supplement pump is connected with the water supplement pipeline, and the other end is connected with the lower header.

[0022] When arranged in the complex connection structure two, one end of the water supplement pump is connected with the water supplement pipeline, and the other end is connected with the inlet of the primary heat exchanger in the first column of the interlayer direct-current heat exchanger.

[0023] The technical scheme adopted by the present disclosure has the following beneficial effects:

[0024] In the present disclosure, the complex connection structure one and the complex connection structure two are a kind of through the change of connection structure, the original small unit heat exchanger output mode is integrated into a complete set integral output, so not only the process system is simplified, but also the control module is greatly reduced, and the control logic is also improved and optimized, wherein the two kinds of complex connection structures are realized by the structure integration through the series connection mode, the original multi-unit independent parallel output mode is changed, under the same rated power output, the heat exchange pipe in the heat exchanger in the series connection mode is compared with the heat exchange pipe in the parallel connection, under the premise of equal output, the cross section must be moderately increased, so that the service life of the heat exchange pipe is greatly improved, and the occurrence of adverse phenomena such as easy damage and easy blockage caused by too thin heat exchange pipe is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be readily understood through reading the detailed description of the exemplary embodiments of the present disclosure below, with reference to the accompanying drawings. In the drawings, several embodiments of the present disclosure are illustrated by way of example and not limitation, in which the same or corresponding elements are referred to by the same or corresponding reference numerals, in which:

[0026] Fig. 1 is a connection structure schematic diagram of the complex connection structure one of the present disclosure;

[0027] Fig. 2 is a unit type lateral schematic diagram of the complex connection structure one of the present disclosure;

[0028] Fig. 3 is a connection structure schematic diagram of the complex connection structure two of the present disclosure;

[0029] Fig. 4 is a unit type lateral schematic diagram of the complex connection structure two of the present disclosure;

[0030] Explanation of reference numerals: 1, heat accumulator, 2, steam heat exchanger, 3, connecting pipe, 4, steam heat exchanger output pipe, 5, steam heat exchanger input pipe, 6, lower header, 7, downcomer, 8, steam drum, 9, steam drum steam output pipe, 10, steam output header, 11, feed water pump, 12, feed water pipe, 13, once-through heat exchanger, 13-1, primary heat exchanger, 13-1-1, primary heat exchanger inlet, 13-1-2 primary heat exchanger outlet, 13-2, secondary heat exchanger, 13-2-1, secondary heat exchanger inlet, 13-2-2, secondary heat exchanger outlet. DETAILED DESCRIPTION

[0031] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Technical means used in the examples are conventional means well known to those skilled in the art, unless otherwise specified.

[0032] It is to be noted that the technical terms or scientific terms used in the present disclosure should be understood as the general meanings understood by those skilled in the art to which the present disclosure pertains, unless otherwise specified. In this context, relational terms such as "first" and "second" and the like are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. The terms "connected," "coupled," and the like should be interpreted broadly, for example, as including fixed connections, detachable connections, or integrations; mechanical connections, electrical connections; direct connections, or indirect connections through intervening media. The terms "include," "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles, or devices. Without more limitations, the elements defined by the phrase "comprising" do not exclude the presence of additional identical elements in the processes, methods, articles, or devices including the elements.

[0033] According to the existing technical problems, a multi-heat exchange module series connection complex structure mode is provided, the original unit type heat exchanger output mode is integrated into a complete integrated output, which not only simplifies the process system, but also greatly reduces the control module, and the control logic is also improved and optimized, and the new complex connection structure is realized by the series connection mode, the original multi-unit independent parallel output mode is changed, under the same rated output power, the heat exchange pipe in the heat exchanger in series connection mode is compared with the heat exchange pipe in the heat exchanger in parallel connection, under the premise of equal output, the cross section must be moderately increased, so that the service life of the heat exchange pipe is greatly improved, and the adverse phenomena such as easy damage and easy blockage caused by too thin heat exchange pipe are avoided or reduced.

[0034] The heat exchanger complex connection structure is a component of the prior art "solid electric heat storage device", and the parts not described or not described in detail in the specification include: heat storage body, heat exchanger, air duct, electric heating, thermal insulation layer, etc.

[0035] The embodiment provides a complex connection structure in a heat exchanger complex connection structure, as shown in Figures 1 and 2, the steam heat exchanger output pipe 4 of the topmost steam heat exchanger 2 is connected with the top steam drum 8 after the vertical 3-6 layers of steam heat exchangers 2 are connected in series, and the steam output pipe 9 of the steam drum of the series connection steam heat exchanger 2 combination structure in the horizontal N (N≥1) column is connected in parallel to form a connection structure through the steam output main pipe 10; wherein the heat storage body 1 is arranged on one side of each layer of steam heat exchangers 2 and connected with the steam heat exchanger 2 through an air duct; the steam heat exchanger 2 is welded by metal finned pipes and has a certain pressure-bearing capacity pipe shell type heat exchanger structure, which is arranged on one side of the heat storage body 1 and connected with the heat storage body 1 through an air duct; the combination structure of the series connection steam heat exchanger 2 is that the steam heat exchanger input pipe 5 and the steam heat exchanger output pipe 4 of the vertical 3-6 layers of steam heat exchangers 2 are connected in series through the connecting pipe 3 in sequence; the steam drum 8 is arranged at the top of the vertical 3-6 layers of steam heat exchangers 2 and connected with the top steam heat exchanger output pipe 4 through the connecting pipe 3; the lower header 6 is arranged at the bottom of the vertical 3-6 layers of steam heat exchangers 2 and connected with the first layer of steam heat exchanger input pipe 5 through the connecting pipe 3 and connected with the steam drum 8 through the downcomer 7; the water supply pump 11 is connected with the water supply pipe 12 at one end and connected with the lower header 6 at the other end.

[0036] In this embodiment, the multi-connection structure one in the heat exchanger multi-connection structure is suitable for saturated steam users with large output flow. The original single control output steam heat exchanger 2 can be integrated through the multi-connection structure one to realize unified control output of multiple steam heat exchangers 2, that is, to simplify the control mode and control logic and provide more convenience for later operation and maintenance. The structure mode is that the steam heat exchanger output pipe 4 of the first layer first column steam heat exchanger 2 and the steam heat exchanger input pipe 5 of the second layer first column steam heat exchanger 2 are connected in series through the connecting pipe 3, then the steam heat exchanger output pipe 4 of the second layer first column steam heat exchanger 2 and the steam heat exchanger input pipe 5 of the third layer first column steam heat exchanger 2 are connected in series through the connecting pipe 3, finally, the steam heat exchanger output pipe 4 of the third layer first column steam heat exchanger 2 is connected with the top steam drum 8 through the connecting pipe 3; the steam drum 8 is connected with the bottom down header 6 through the downcomer 7, and the down header 6 is connected with the steam heat exchanger input pipe 5 of the first layer first column steam heat exchanger 2 through the connecting pipe 3, thus forming a structure form of a natural circulation boiler, realizing single column integrated output, and the connection structures of other columns are the same, then the steam drum steam output pipes 9 of the steam drums 8 of each column are connected in parallel through the steam output main pipe 10 to output steam externally, and the water supply side supplies water through the water supply pipes 12 through the corresponding water supply pumps 11 of the bottom down headers 6 of each column.

[0037] The embodiment provides a compound connection structure two in a heat exchanger compound connection structure, as shown in Figures 3 and 4, which is a connection structure in which horizontal M (M>=3) column direct-current heat exchangers 13 are connected in series horizontally, then vertical 1-6 layer interlayer series direct-current heat exchanger combination structures are connected in parallel through a steam output header 10. The direct-current heat exchanger 13 is a tube-shell heat exchanger structure welded by metal finned tubes and having certain pressure-bearing capacity, which is arranged on one side of a heat storage body 1 and connected with the heat storage body 1 through an air duct. The direct-current heat exchanger includes a primary heat exchanger 13-1, which is arranged at the rear end of a secondary heat exchanger 13-2 and provided with a primary heat exchanger inlet 13-1-1 and a primary heat exchanger outlet 13-1-2. The secondary heat exchanger 13-2 is arranged at the front end of the primary heat exchanger 13-1, i.e. on the side close to the heat storage body 1, and provided with a secondary heat exchanger inlet 13-2-1 and a secondary heat exchanger outlet 13-2-2. The series direct-current heat exchanger combination structure is a combination structure in which the interlayer horizontal M (M>=3) column direct-current heat exchangers 13 are connected in series through connection pipes 3 in sequence. The series connection mode is that the primary heat exchanger inlet 13-1-1 in the first column direct-current heat exchanger 13 is connected with the primary heat exchanger outlet 13-1-2 through the connection pipe 3, the primary heat exchanger inlet 13-1-1 in the second column direct-current heat exchanger 13 is connected with the primary heat exchanger inlet 13-1-1 in the Mth column direct-current heat exchanger 13 through the connection pipe 3, the primary heat exchanger outlet 13-1-2 in the Mth column direct-current heat exchanger 13 is connected with the secondary heat exchanger inlet 13-1-1, and finally, the secondary heat exchangers 13-2 are connected in series in reverse according to the series connection mode of the primary heat exchangers 13-1, so as to form the combination structure in which the primary heat exchangers 13-1 of the interlayer direct-current heat exchangers 13 are connected in series first and then the secondary heat exchangers 13-2 are connected in series. The total inlet and the total outlet of the combination structure are the primary heat exchanger inlet 13-1-1 in the first column direct-current heat exchanger 13 and the secondary heat exchanger outlet 13-2-2, respectively. The water supply pump 11 is connected with the water supply pipe 12 on one side and connected with the primary heat exchanger inlet 13-1 in the first column direct-current heat exchanger 13 on the other side.

[0038] In this embodiment, the complex connection structure two in the heat exchanger complex connection structure is suitable for wet saturated steam users dedicated to oilfield heavy oil exploitation. The original single control output direct flow heat exchanger 13 can be integrated through the complex connection structure two mode to realize the series connection of multiple direct flow heat exchangers 13 for unified control output. Under the calibrated output steam parameter, the cross-sectional area of a single bundle of heat exchange tubes can be increased to prevent the heat exchange tube from being too thin, which can cause the heat exchange tube to be easily blocked and affect the service life of the direct flow heat exchanger 13. Moreover, after the integration through the complex connection structure two mode, the control mode and control logic of the complete equipment are simplified, which provides more convenience for the later operation and maintenance. The structure mode is that the primary heat exchanger outlet 13-1-2 of the first layer first column direct flow heat exchanger 13 and the primary heat exchanger inlet 13-1-1 of the first layer second column direct flow heat exchanger 13 are connected in series through the connecting pipe 3, and then the primary heat exchanger outlet 13-1-2 of the first layer second column direct flow heat exchanger 13 and the primary heat exchanger inlet 13-1-1 of the first layer Mth column direct flow heat exchanger 13 are connected in series through the connecting pipe 3, and then the primary heat exchanger outlet 13-1-2 of the first layer Mth column direct flow heat exchanger 13 is connected in communication with the secondary heat exchanger inlet 13-2-1 through the connecting pipe 3. According to the series mode of the primary heat exchanger 13-1 of the first layer direct flow heat exchanger 13, the secondary heat exchanger 13-2 of the first layer direct flow heat exchanger 13 is also connected in series to form a horizontal series structure mode in the same layer. The series mode of other layers is the same as that of the first layer. In this way, the total inlet and total outlet of each layer are the primary heat exchanger inlet 13-1-1 and the secondary heat exchanger outlet 13-2-2 of the first column direct flow heat exchanger 13 in the layer, respectively. One set of water supply pump 11 is arranged in each layer to supply water through the water supply pipe 12, thereby forming a direct flow boiler with the layer as a unit output. The second column direct flow heat exchanger secondary heat exchanger outlet 13-2-2 of the first column direct flow heat exchanger in each layer is connected in parallel to the external output through the steam output header 10. In some special sites, the Mth column direct flow heat exchanger 13 of the vertical 1-6 layers can be connected in series to form a steam output structure.

[0039] The above heat exchanger complex connection structure is suitable for producing saturated steam with a certain water content. If the water content of the output steam is too high, a steam-water separation device can be adapted to improve the steam dryness. The output saturated steam can be used to produce superheated steam through a heater.

[0040] The above description is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A heat exchanger complex connection structure, comprising a complex connection structure I and a complex connection structure II; The complex connection structure I comprises: A connection structure in which N columns of single-column series connection heat exchanger combination structures are connected in parallel through a steam output header pipe after being connected in series by 3-6 vertical layers of steam heat exchangers and being connected to a top drum, wherein N≥1; The heat accumulator is made of refractory sintered bricks and has an internal structure integrating electric energy storage and heat energy release, and is arranged on one side of the steam heat exchanger and connected to the steam heat exchanger; The steam heat exchanger is made of metal finned tubes and is provided with a steam heat exchanger input pipe and a steam heat exchanger output pipe, and is arranged on one side of the heat accumulator and connected to the heat accumulator; The drum is arranged on the top of the vertical top layer of steam heat exchanger and is connected to the top layer of steam heat exchanger output pipe through a connecting pipe; The lower header is arranged at the bottom of the vertical 3-6 layers of steam heat exchangers, connected to the first layer of steam heat exchanger input pipe through a connecting pipe, and connected to the drum through a downcomer; The complex connection structure II comprises: A connection structure in which 1-6 vertical layers of series connection direct current heat exchangers are connected in parallel through a steam output header pipe after being connected in series by M columns of horizontal direct current heat exchangers, wherein M≥3; The heat accumulator is made of refractory sintered bricks and has an internal structure integrating electric energy storage and heat energy release, and is arranged on one side of the direct current heat exchanger and connected to the direct current heat exchanger; The direct current heat exchanger is made of metal finned tubes and is arranged on one side of the heat accumulator and connected to the heat accumulator; The direct current heat exchanger comprises: The primary heat exchanger is a low-temperature heat exchanger provided with a primary heat exchanger inlet and a primary heat exchanger outlet, and is arranged at the rear end of the secondary heat exchanger; The secondary heat exchanger is a high-temperature heat exchanger provided with a secondary heat exchanger inlet and a secondary heat exchanger outlet, and is arranged at the front end of the primary heat exchanger, i.e. on the side close to the heat accumulator.

2. The heat exchanger compound connection structure according to claim 1, wherein Further comprising: The series connection steam heat exchanger combination structure is arranged in the complex connection structure I and is a combination structure in which the steam heat exchanger input pipes and the steam heat exchanger output pipes of the vertical 3-6 layers of steam heat exchangers are connected in series through connecting pipes; The series connection combination structure of the direct current heat exchanger is arranged in the complex connection structure II and is a combination structure in which the horizontally adjacent M columns of direct current heat exchangers in the horizontal layer are connected in series through connecting pipes, wherein the series connection mode is that the primary heat exchanger inlet of the first column of direct current heat exchangers is connected to the primary heat exchanger inlet of the second column of direct current heat exchangers through the primary heat exchanger outlet, and the primary heat exchanger inlet of the Mth column of direct current heat exchangers is connected to the secondary heat exchanger inlet through the primary heat exchanger outlet of the Mth column of direct current heat exchangers, and the secondary heat exchangers are connected in reverse series according to the series connection mode of the primary heat exchangers to form the combination structure in which the primary heat exchangers of the direct current heat exchangers in the layer are connected in series first and then the secondary heat exchangers are connected in series; the total inlet of the combination structure is the primary heat exchanger inlet of the first column of direct current heat exchangers, and the total outlet is the secondary heat exchanger outlet of the first column of direct current heat exchangers.

3. The heat exchanger compound connection structure according to claim 1, wherein Further comprising: The water supply pump; When arranged in the complex connection structure one, one end of the makeup water pump is connected with the makeup water pipeline, and the other end is connected with the lower header; When arranged in the complex connection structure two, one end of the makeup water pump is connected with the makeup water pipeline, and the other end is connected with the inlet of the primary heat exchanger in the first column of the direct-current heat exchanger.

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