Pure countercurrent modular plate-type air preheater for oil field steam-injection boiler
By using modular design and counter-current heat exchange technology, the problems of insufficient energy recovery capacity and large equipment size of traditional air preheaters have been solved, realizing a highly efficient waste heat recovery and compact air preheater, which improves the energy utilization rate and installation convenience of oilfield steam injection boilers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional air preheaters have limited energy recovery capabilities in oilfield steam injection boilers, are bulky, difficult to install, and cannot fully utilize waste heat resources.
The modularly designed pure counter-flow plate air preheater uses welded heat exchange modules to combine air and flue gas in a counter-flow heat exchange manner, and is reinforced with equilateral angle steel to achieve efficient heat exchange.
It improves energy efficiency, reduces operating energy consumption, enhances the versatility and scalability of equipment, reduces gas leakage, and improves structural stability and ease of installation.
Smart Images
Figure CN224065526U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of boiler technology, specifically to a pure counter-current modular plate air preheater for oilfield steam injection boilers. Background Technology
[0002] At the tail end of steam injection boilers in oil fields, there is a large amount of recoverable waste heat from flue gas. To achieve effective energy conservation, air preheaters have become a common device. However, traditional air preheaters have revealed many problems when dealing with waste heat recovery from steam injection boilers. On the one hand, their energy recovery capacity is limited, failing to fully utilize the abundant waste heat resources; on the other hand, due to the large scale of waste heat generated by steam injection boilers, the corresponding heat exchangers are bulky, occupying a significant amount of structural space and facing difficulties in actual installation, such as excessive floor space requirements and on-site installation challenges. Therefore, it is necessary to propose a pure counter-current modular plate air preheater for oil field steam injection boilers to solve the above problems. Utility Model Content
[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a pure counter-current modular plate air preheater for oilfield steam injection boilers, thereby solving the problems of limited energy recovery capacity and large size of existing air preheaters.
[0004] This utility model provides a pure counter-current modular plate air preheater for oilfield steam injection boilers, including multiple heat exchange modules, an air transfer box, an air inlet interface, an air outlet interface, a flue gas inlet interface, and a flue gas outlet interface. Each heat exchange module has air inlet sealing plates on both sides of the air flow path, flue gas inlet sealing plates on both sides of the flue gas flow path, and counter-current flue gas sealing plates installed at the front and rear sides of the flue gas flow path. The air transfer box connects the air channels of adjacent heat exchange modules. The flue gas inlet interface and flue gas outlet interface are respectively located at the beginning and end of the flue gas flow path of the heat exchange module, and the air inlet interface and air outlet interface are respectively located at the beginning and end of the air flow path of the heat exchange module and communicate with the air transfer box.
[0005] Furthermore, the heat exchange module includes several pairs of parallel heat exchange plates, adjacent pairs of heat exchange plates are sealed by ordinary inserts and side plate inserts, the outer side is sealed by front and rear sealing plates, and the four sides are reinforced by equilateral angle steel.
[0006] Furthermore, the equilateral angle steel includes a first equilateral angle steel, a second equilateral angle steel, and a third equilateral angle steel, which are respectively fixed to the bottom, side, and top of the heat exchange module.
[0007] Furthermore, the air transfer box has a U-shaped structure.
[0008] The beneficial effects of this utility model are:
[0009] This invention adopts a modular design, with heat exchange modules connected by welding. The number of modules can be flexibly selected as needed. This allows the equipment to better adapt to steam injection boilers of different power and operating conditions. Whether it is the compact installation of small boilers or the high-efficiency heat exchange requirements of large boilers, it can easily cope with the needs, greatly enhancing the equipment's versatility and scalability. Compared with an integral structure, there is no need to redesign and manufacture new equipment for different scale requirements, reducing production costs and time costs.
[0010] This invention achieves pure counter-current plate heat exchange by precisely setting counter-current sealing plates on the front and rear sides of the flue gas flow path. Counter-current heat exchange allows the flue gas and air to exchange heat at the maximum temperature difference, resulting in a larger average temperature difference for heat transfer. This leads to more efficient recovery of waste heat from the tail end of the steam injection boiler flue gas, improving energy utilization and reducing boiler operating energy consumption.
[0011] The heat exchange module of this invention consists of several pairs of heat exchange plates. The plates are sealed together by ordinary inserts and side plate inserts, and the outer side is sealed by front and rear sealing plates. Equal-sided angle steel is used for reinforcement around the perimeter, and inlet sealing plates are carefully designed on both the air and flue gas flow sides. This comprehensively optimized structural design greatly improves the sealing performance of the heat exchange module, reduces gas leakage, and ensures heat exchange efficiency; it also enhances structural stability, allowing it to withstand higher pressures and temperatures; and the well-designed airflow channel connection allows air and flue gas to enter the heat exchange area more smoothly, further improving the overall performance of the equipment. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a front view of a pure counter-current modular plate air preheater for an oilfield steam injection boiler according to this utility model.
[0014] Figure 2 This is a three-dimensional view of a pure counter-current modular plate air preheater for an oilfield steam injection boiler according to this utility model.
[0015] Figure 3 This is a three-dimensional view of a pure counter-current modular plate air preheater heat exchange module for an oilfield steam injection boiler according to this utility model.
[0016] Figure 4 This is a front view of a pure counter-current modular plate air preheater heat exchange module for an oilfield steam injection boiler, according to this utility model.
[0017] Diagram Explanation: 1-Heat exchange module; 2-Air transfer box; 3-Air inlet interface; 4-Air outlet interface; 5-Flue gas inlet interface; 6-Flue gas outlet interface; 11-Heat exchange plate pair; 12-Ordinary insert; 13-Side plate insert; 14-Front and rear sealing plates; 15-First equal-sided angle steel; 16-Second equal-sided angle steel; 17-Third equal-sided angle steel; 18-Air inlet sealing plate; 19-Flue gas backflow sealing plate; 110-Flue gas inlet sealing plate. Detailed Implementation
[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0019] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0020] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions has been enlarged, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.
[0021] This utility model provides a pure counter-current modular plate air preheater for oilfield steam injection boilers. This equipment utilizes a modular design concept and pure counter-current plate heat exchange technology, enabling efficient recovery of waste heat from the flue gas tail end of the steam injection boiler, effectively reducing equipment size and maintenance costs. The following section uses a three-module plate air preheater as an example to explain its technical solution in detail.
[0022] Please see Figures 1 to 4 This utility model provides a pure counter-current modular plate air preheater for oilfield steam injection boilers, including: three heat exchange modules 1, an air transfer box 2, an air inlet interface 3, an air outlet interface 4, a flue gas inlet interface 5, and a flue gas outlet interface 6.
[0023] In order to facilitate the access of the air flow path, the heat exchange module 1 is provided with air inlet sealing plates 18 on both sides of the air flow path; and flue gas inlet sealing plates 110 are provided on both sides of the flue gas flow path. In order to achieve the counter-current heat exchange effect, flue gas counter-current sealing plates 19 are installed on the front and rear sides of the flue gas flow path, so as to realize the counter-current heat exchange between flue gas and air.
[0024] The air transfer box 2 has a U-shaped structure. The air transfer box 2 connects to the air channel of the adjacent heat exchange module 1. The flue gas inlet interface 5 and the flue gas outlet interface 6 are respectively located at the beginning and end of the flue gas flow path of the heat exchange module 1. The air inlet interface 3 and the air outlet interface 4 are respectively located at the beginning and end of the air flow path of the heat exchange module 1 and are connected to the air transfer box 2.
[0025] Specifically, the heat exchange module 1 includes several parallel pairs of heat exchange plates 11. Adjacent pairs of heat exchange plates 11 are sealed by ordinary inserts 12 and side plate inserts 13, and the outer side is sealed by front and rear sealing plates 14. To enhance structural stability, the module is reinforced with equilateral angle steel on all four sides. The heat exchange module structure consists of several pairs of heat exchange plates, which are sealed between the plates by ordinary inserts and side plate inserts. The outer side is sealed by front and rear sealing plates and reinforced with equilateral angle steel. Inlet sealing plates are designed on both the air and flue gas flow sides to ensure the sealing performance, stability, and good connection with the airflow channel of the heat exchange module.
[0026] Specifically, the equilateral angle steel includes a first equilateral angle steel 15, a second equilateral angle steel 16, and a third equilateral angle steel 17, which are respectively fixed to the bottom, side, and top of the heat exchange module 1.
[0027] Flue gas enters the flue gas passage of heat exchange module 1 through flue gas inlet interface 5. After completing the heat exchange process, it enters the chimney and is discharged through flue gas outlet interface 6. At the same time, air enters the air passage of heat exchange module 1 through air inlet interface 3. After heat exchange, it enters the boiler through air outlet interface 4 for combustion support.
[0028] The heat exchange modules 1 are connected to each other by welding, and the number of modules can be flexibly selected according to actual needs. Air flow between the heat exchange modules 1 is achieved through the air transfer box 2, while flue gas flows between the modules through the connection points between the modules.
[0029] This utility model discloses a pure counter-current modular plate air preheater for oilfield steam injection boilers. It features a plate structure, a compact design, and high heat exchange efficiency. The pure counter-current heat exchange method ensures that the hot and cold fluids maintain the maximum temperature difference, greatly enhancing the heat transfer process and significantly improving thermal efficiency. This not only reduces fuel consumption and improves the energy utilization rate of oilfield steam injection boilers but also further reduces operating costs.
[0030] This invention breaks down the preheater into multiple independent modules, greatly simplifying transportation and installation. More importantly, the modules can be flexibly assembled according to actual working conditions, site conditions, and expected heat recovery requirements in different projects. For example, for projects with limited space, compact modules of appropriate size and quantity can be used for a tight layout; while for projects with large waste heat volumes and high heat recovery requirements, the number of heat exchange modules can be increased or modules with larger heat exchange areas can be selected to achieve efficient waste heat recovery. When a module fails, the entire equipment can be quickly replaced without disassembling the entire unit, effectively reducing downtime and significantly improving equipment reliability and maintenance convenience.
[0031] The heat exchange modules of this invention are connected by welding, and the number of modules can be flexibly selected according to actual needs, making it adaptable to steam injection boilers of different sizes and enhancing the versatility and scalability of the equipment. By setting flue gas counter-flow sealing plates on the front and rear sides of the flue gas flow, counter-flow heat exchange between flue gas and air is achieved, improving heat exchange efficiency and facilitating the efficient recovery of waste heat from the tail end of the flue gas.
[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in sequences other than those illustrated or described herein.
[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A pure counter flow modular plate air preheater for oil field steam injection boilers, characterized in that, The application relates to a heat exchange device. The heat exchange device comprises a plurality of heat exchange modules (1), an air switching box (2), an air inlet interface (3), an air outlet interface (4), a flue gas inlet interface (5) and a flue gas outlet interface (6). The heat exchange module (1) is provided with air inlet sealing plates (18) on both sides of an air flow path, flue gas inlet sealing plates (110) on both sides of a flue gas flow path and flue gas counter-flow sealing plates (19) on the front and back sides of the flue gas flow path. The air switching box (2) is connected with air channels of adjacent heat exchange modules (1), the flue gas inlet interface (5) and the flue gas outlet interface (6) are arranged at the head end and the tail end of the flue gas flow path of the heat exchange module (1) respectively, and the air inlet interface (3) and the air outlet interface (4) are arranged at the head end and the tail end of the air flow path of the heat exchange module (1) and are communicated with the air switching box (2).
2. A pure counter-flow modular plate air preheater for oilfield steam injection boilers as claimed in claim 1, characterized in that, The heat exchange module (1) comprises a plurality of parallel heat exchange plate pairs (11), adjacent heat exchange plate pairs (11) are sealed through common inserts (12) and edge plate inserts (13), the outer side is sealed by front and back sealing plates (14), and the periphery is reinforced through equal-leg angle steels.
3. A pure counter-flow modular plate air preheater for oilfield steam injection boilers as claimed in claim 2, characterized in that, The equal-leg angle steels comprise first equal-leg angle steels (15), second equal-leg angle steels (16) and third equal-leg angle steels (17) and are fixed to the bottom, the side and the top of the heat exchange module (1) respectively.
4. A pure counter-flow modular plate air preheater for oil field steam injection boilers as claimed in claim 1, wherein, The air switching box (2) has a U-shaped structure.