CN108267032A - A kind of heat-exchanger rig and system with honeycomb - Google Patents
A kind of heat-exchanger rig and system with honeycomb Download PDFInfo
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- CN108267032A CN108267032A CN201810187318.3A CN201810187318A CN108267032A CN 108267032 A CN108267032 A CN 108267032A CN 201810187318 A CN201810187318 A CN 201810187318A CN 108267032 A CN108267032 A CN 108267032A
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- heat exchange
- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1615—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
- F23L15/045—Arrangements of recuperators using intermediate heat-transfer fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
本发明公开了一种带有蜂窝结构的换热装置及系统，换热装置内布置有立式蜂窝管，所述的立式蜂窝管上分布有内凹孔，热烟气从蜂窝结构的换热装置上部进入管程，冷空气进入蜂窝结构的换热装置壳程强制湍流换热，冷空气升温后完成换热过程。热烟气的垂直流程有效避免了受热面飞灰沉积和腐蚀，蜂窝管结构大大增加了受热面积和降低传热热阻，有效提高了换热效率。本发明具有成本低、适用范围广的优点，可满足不同冷热流体的换热要求。
The invention discloses a heat exchange device and system with a honeycomb structure. Vertical honeycomb tubes are arranged in the heat exchange device, and concave holes are distributed on the vertical honeycomb tubes. Hot flue gas is exchanged from the honeycomb structure. The upper part of the heat device enters the tube side, and the cold air enters the shell side of the heat exchange device with a honeycomb structure to force turbulent heat exchange, and the heat exchange process is completed after the cold air is heated up. The vertical flow of hot flue gas effectively avoids the deposition and corrosion of fly ash on the heating surface. The honeycomb tube structure greatly increases the heating area and reduces the heat transfer resistance, effectively improving the heat exchange efficiency. The invention has the advantages of low cost and wide application range, and can meet the heat exchange requirements of different cold and hot fluids.
Description
技术领域technical field
本发明属于热交换技术领域，特别涉及一种带有蜂窝结构的换热装置及系统。The invention belongs to the technical field of heat exchange, in particular to a heat exchange device and system with a honeycomb structure.
背景技术Background technique
我国是世界上主要的煤炭生产和消费国，也是以煤炭为主要一次能源的国家。在未来相当长的时期内，我国以煤炭为主要能源的格局不会改变。my country is the world's major coal producer and consumer, and also a country that uses coal as its primary energy source. For a long period of time in the future, my country's pattern of using coal as the main energy source will not change.
燃煤锅炉所用煤质灰分高、热值低使得锅炉换热面容易产生积灰、磨损、堵塞、腐蚀等一系列问题。由于换热装置外壁沉积的灰层绝热性很强，可使受热面传热能力大幅降低。此外，积灰会使尾部烟道受热面发生堵塞、传热恶化，增加排烟温度，降低锅炉运行经济性。堵塞的受热面会降低烟气的流通面积，使烟速提高增大受热面的磨损。堵塞同样会导致换热装置流体阻力变大，增加了风机能耗，造成厂用电率增加。换热装置的腐蚀会造成冷热侧介质泄露，影响系统运行的经济型和可靠性，导致锅炉排烟热损失增加，锅炉的效率下降，增加污染物温室气体二氧化碳、二氧化硫、氮氧化物等有害气体的排放。The coal used in coal-fired boilers has high ash content and low calorific value, which makes the heat exchange surface of the boiler prone to a series of problems such as dust accumulation, wear, blockage, and corrosion. Because the ash layer deposited on the outer wall of the heat exchange device has strong thermal insulation, it can greatly reduce the heat transfer capacity of the heating surface. In addition, dust accumulation will block the heating surface of the tail flue, deteriorate the heat transfer, increase the exhaust gas temperature, and reduce the economical efficiency of the boiler operation. A clogged heating surface will reduce the flow area of the flue gas, increase the smoke velocity and increase the wear of the heating surface. Blockage will also increase the fluid resistance of the heat exchange device, increase the energy consumption of the fan, and increase the power consumption rate of the plant. The corrosion of the heat exchange device will cause the leakage of the hot and cold side media, affect the economy and reliability of the system operation, increase the heat loss of the boiler exhaust smoke, reduce the efficiency of the boiler, and increase the harmful greenhouse gases such as carbon dioxide, sulfur dioxide, and nitrogen oxides. gas emissions.
发明内容Contents of the invention
为了克服上述现有技术的缺点，本发明的目的在于提供一种带有蜂窝结构的换热装置及系统，可大幅提高换热效率，节约风机电耗，有效防止换热装置积灰，解决换热面的堵塞、磨损和腐蚀问题。同时可有效降低锅炉排烟热损失，降低厂用电率，提高煤炭资源利用率和转化率。In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a heat exchange device and system with a honeycomb structure, which can greatly improve the heat exchange efficiency, save the power consumption of the fan, effectively prevent the heat exchange device from accumulating dust, and solve the problem of heat exchange. Clogging, wear and corrosion problems on hot surfaces. At the same time, it can effectively reduce the heat loss of boiler exhaust, reduce the power consumption rate of the factory, and improve the utilization rate and conversion rate of coal resources.
为了实现上述目的，本发明采用的技术方案是：In order to achieve the above object, the technical scheme adopted in the present invention is:
一种带有蜂窝结构的换热装置，包括热烟气入口1、冷烟气出口2、冷流体入口3和热流体出口4，其特征在于，换热装置的内部为立式蜂窝管6，热烟气入口1、冷烟气出口2与立式蜂窝管6连通，冷流体入口3、热流体出口4与立式蜂窝管6的管外空间连通。A heat exchange device with a honeycomb structure, comprising a hot flue gas inlet 1, a cold flue gas outlet 2, a cold fluid inlet 3 and a hot fluid outlet 4, characterized in that the inside of the heat exchange device is a vertical honeycomb tube 6, The hot flue gas inlet 1 and the cold flue gas outlet 2 are in communication with the vertical honeycomb tube 6 , and the cold fluid inlet 3 and the hot fluid outlet 4 are in communication with the outer space of the vertical honeycomb tube 6 .
所述立式蜂窝管6在换热装置内部有多个，相互并联平行设置。There are multiple vertical honeycomb tubes 6 inside the heat exchange device, which are arranged in parallel with each other.
所述换热装置为六面体结构，热烟气入口1在顶面，冷烟气出口2在底面，冷流体入口3在前端面，热流体出口4在后端面，左右侧面以壳体5密封，壳体5具有密封冷热流体的作用。The heat exchange device has a hexahedral structure, the hot flue gas inlet 1 is on the top surface, the cold flue gas outlet 2 is on the bottom surface, the cold fluid inlet 3 is on the front end surface, the hot fluid outlet 4 is on the rear end surface, and the left and right sides are sealed with a casing 5. The casing 5 has the function of sealing cold and hot fluids.
所述热烟气入口1、冷烟气出口2的四周设有密封装置，保证烟气顺畅进入换热装置，同时避免烟气的泄露。Sealing devices are provided around the hot flue gas inlet 1 and the cold flue gas outlet 2 to ensure that flue gas enters the heat exchange device smoothly and avoid flue gas leakage.
所述冷流体入口3、热流体出口4的四周设有密封装置，避免烟气的泄露以及冷、热流体的泄露。Sealing devices are provided around the cold fluid inlet 3 and the hot fluid outlet 4 to avoid the leakage of smoke and the leakage of cold and hot fluids.
所述热烟气入口1进入的介质是高温流体，如热水、汽水混合物、蒸汽或烟气等；所述冷流体入口3进入的介质是待加热的低温流体，如水或空气等。即，立式蜂窝管6内的流动工质是高温流体，立式蜂窝管6外的流动工质是待加热的低温流体。The medium entering the hot flue gas inlet 1 is a high-temperature fluid, such as hot water, steam-water mixture, steam or flue gas, etc.; the medium entering the cold fluid inlet 3 is a low-temperature fluid to be heated, such as water or air. That is, the working fluid inside the vertical honeycomb tube 6 is a high-temperature fluid, and the working fluid outside the vertical honeycomb tube 6 is a low-temperature fluid to be heated.
所述冷烟气出口2设有可逆向吹扫立式蜂窝管6的吹扫装置，避免受热面覆盖飞灰等杂质，影响换热效率。The cold flue gas outlet 2 is provided with a purging device capable of purging the vertical honeycomb tube 6 in reverse, so as to prevent the heating surface from being covered with impurities such as fly ash, which will affect the heat exchange efficiency.
所述立式蜂窝管6壁厚为2～5mm，外管壁7上分布有蜂窝状的内凹孔9，内凹孔9形状为多边形或圆形。The wall thickness of the vertical honeycomb tube 6 is 2-5 mm, and the outer tube wall 7 is distributed with honeycomb-shaped inner concave holes 9, and the shape of the inner concave holes 9 is polygonal or circular.
本发明还要求保护含有所述带蜂窝结构的换热装置的换热系统。The present invention also claims to protect the heat exchange system containing the heat exchange device with honeycomb structure.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
1.本发明带有蜂窝结构的换热装置立式布置，避免了现有换热装置积灰、堵塞、腐蚀等诸多缺点。1. The vertical arrangement of the heat exchange device with the honeycomb structure of the present invention avoids many shortcomings such as dust accumulation, blockage and corrosion of the existing heat exchange device.
2.本发明带有蜂窝结构的换热装置提高了换热面积，降低了热阻，热交换效率可提高20％以上。2. The heat exchange device with the honeycomb structure of the present invention increases the heat exchange area, reduces the heat resistance, and the heat exchange efficiency can be increased by more than 20%.
3.本发明带有蜂窝结构的换热装置可有效降低流体阻力，风机能耗大幅降低。3. The heat exchange device with honeycomb structure of the present invention can effectively reduce fluid resistance, and greatly reduce the energy consumption of fans.
4.本发明带有蜂窝结构的换热装置用作空预器可降低锅炉排烟热损失，提高锅炉效率和能源利用率。4. The heat exchange device with honeycomb structure of the present invention is used as an air preheater, which can reduce boiler exhaust heat loss and improve boiler efficiency and energy utilization.
5.本发明带有蜂窝结构的换热装置结构简单、运行可靠、具有广泛应用前景。5. The heat exchange device with honeycomb structure of the present invention is simple in structure, reliable in operation, and has wide application prospects.
附图说明Description of drawings
图1是本发明换热装置结构示意图。Fig. 1 is a schematic diagram of the structure of the heat exchange device of the present invention.
图2是本发明立式蜂窝管的结构图。Fig. 2 is a structural diagram of the vertical honeycomb pipe of the present invention.
具体实施方式Detailed ways
下面结合附图和实施例详细说明本发明的实施方式。The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.
参考图1，本发明一种带有蜂窝结构的换热装置，采用六面体结构(图中为长方体)，热烟气入口1在顶面，冷烟气出口2在底面，冷流体入口3在前端面，热流体出口4在后端面，左右侧面以壳体5密封，壳体5具有密封冷热流体的作用。换热装置的内部为多个相互并联平行设置的立式蜂窝管6，热烟气入口1、冷烟气出口2与立式蜂窝管6连通，冷流体入口3、热流体出口4与立式蜂窝管6的管外空间(换热装置内)连通。即，立式蜂窝管6内的流动工质是高温流体，立式蜂窝管6外的流动工质是待加热的低温流体。Referring to Fig. 1, a heat exchange device with a honeycomb structure of the present invention adopts a hexahedral structure (cuboid in the figure), the hot flue gas inlet 1 is on the top surface, the cold flue gas outlet 2 is on the bottom surface, and the cold fluid inlet 3 is on the front end On the surface, the hot fluid outlet 4 is on the rear end face, and the left and right sides are sealed with a casing 5, which has the function of sealing cold and hot fluids. The interior of the heat exchange device is a plurality of vertical honeycomb tubes 6 arranged in parallel with each other. The hot flue gas inlet 1 and the cold flue gas outlet 2 are connected to the vertical honeycomb tubes 6. The cold fluid inlet 3 and the hot fluid outlet 4 are connected to the vertical honeycomb tubes. The space outside the tube (inside the heat exchange device) of the honeycomb tube 6 communicates. That is, the working fluid inside the vertical honeycomb tube 6 is a high-temperature fluid, and the working fluid outside the vertical honeycomb tube 6 is a low-temperature fluid to be heated.
热烟气入口1、冷烟气出口2的四周设有密封装置，保证烟气顺畅进入换热装置，同时避免烟气的泄露。冷流体入口3、热流体出口4的四周设有密封装置，避免烟气的泄露以及冷、热流体的泄露。A sealing device is provided around the hot flue gas inlet 1 and the cold flue gas outlet 2 to ensure that flue gas enters the heat exchange device smoothly and avoid flue gas leakage. Sealing devices are provided around the cold fluid inlet 3 and the hot fluid outlet 4 to avoid the leakage of flue gas and the leakage of cold and hot fluids.
冷烟气出口2设有可逆向吹扫立式蜂窝管6的吹扫装置，避免受热面覆盖飞灰等杂质，影响换热效率。吹扫装置可采用蒸汽或压缩空气为气源的吹灰器。The cold flue gas outlet 2 is equipped with a purging device that can reversely purge the vertical honeycomb tube 6 to prevent the heating surface from being covered with fly ash and other impurities, which will affect the heat exchange efficiency. The purging device can use a soot blower with steam or compressed air as the gas source.
立式蜂窝管6的结构参考图2，其为管状结构，壁厚为2～5mm，内管壁8光滑，外管壁7上分布有蜂窝状的内凹孔9，内凹孔9形状为多边形或圆形，显而易见，内凹孔9并非通透孔。Referring to Figure 2 for the structure of the vertical honeycomb tube 6, it is a tubular structure with a wall thickness of 2 to 5 mm, the inner tube wall 8 is smooth, and the outer tube wall 7 is distributed with honeycomb-shaped inner concave holes 9, the shape of the inner concave holes 9 is Polygonal or circular, it is obvious that the concave hole 9 is not a through hole.
以下是采用不同工质的几个具体实例。The following are several specific examples of using different working fluids.
实施例一：Embodiment one:
如图1所示，锅炉热烟气通过热烟气入口1进入换热装置的立式蜂窝管6内，热烟气完成换热后从冷烟气出口2排出，冷空气从冷流体入口3进入换热装置，立式蜂窝管6表面蜂窝结构加强湍动强度且降低热阻，冷空气在换热装置内完成高效换热温度升高，热空气从热流体出口4排出，完成热烟气降温和冷空气升温的换热过程。As shown in Figure 1, the hot flue gas of the boiler enters the vertical honeycomb tube 6 of the heat exchange device through the hot flue gas inlet 1, the hot flue gas is discharged from the cold flue gas outlet 2 after heat exchange, and the cold air is discharged from the cold fluid inlet 3 Entering the heat exchange device, the honeycomb structure on the surface of the vertical honeycomb tube 6 strengthens the turbulent intensity and reduces the thermal resistance, the cold air completes efficient heat exchange in the heat exchange device and the temperature rises, and the hot air is discharged from the hot fluid outlet 4 to complete the hot flue gas The heat exchange process of cooling down and warming up cold air.
实施例二：Embodiment two:
如图1所示，锅炉热烟气通过热烟气入口1进入换热装置的立式蜂窝管6内，热烟气完成换热后从冷烟气出口2排出，低温水从冷流体入口3进入换热装置，立式蜂窝管6表面蜂窝结构加强湍动强度且降低热阻，低温水在换热装置内完成高效换热温度升高，高温水从热流体出口4排出，完成热烟气降温和低温水升温的换热过程。As shown in Figure 1, the hot flue gas of the boiler enters the vertical honeycomb tube 6 of the heat exchange device through the hot flue gas inlet 1, the hot flue gas is discharged from the cold flue gas outlet 2 after heat exchange, and the low-temperature water is discharged from the cold fluid inlet 3 Entering the heat exchange device, the honeycomb structure on the surface of the vertical honeycomb tube 6 strengthens the turbulence intensity and reduces the thermal resistance, the low temperature water completes the efficient heat exchange in the heat exchange device, the temperature rises, and the high temperature water is discharged from the hot fluid outlet 4 to complete the hot flue gas The heat exchange process of cooling down and warming up of low temperature water.
实施例三：Embodiment three:
如图1所示，企业排汽通过热烟气入口1进入换热装置的立式蜂窝管6内，排汽完成换热后从冷烟气出口2排出，低温水从冷流体入口3进入换热装置，立式蜂窝管6表面蜂窝结构加强湍动强度且降低热阻，低温水在蜂窝结构的换热装置内完成高效换热温度升高，高温水从热流体出口4排出，完成低温水升温的换热过程，高温水可用于工业或居民供热。As shown in Figure 1, the enterprise’s exhaust steam enters the vertical honeycomb tube 6 of the heat exchange device through the hot flue gas inlet 1, and the exhaust steam is discharged from the cold flue gas outlet 2 after heat exchange is completed, and the low-temperature water enters the heat exchanger from the cold fluid inlet 3 The heat device, the honeycomb structure on the surface of the vertical honeycomb tube 6 strengthens the turbulence intensity and reduces the thermal resistance, the low-temperature water completes efficient heat exchange in the heat exchange device of the honeycomb structure, and the temperature rises, and the high-temperature water is discharged from the hot fluid outlet 4 to complete the low-temperature water In the heat exchange process of heating up, high-temperature water can be used for industrial or residential heating.
综上，本发明换热装置内布置有立式蜂窝管，立式蜂窝管上分布有内凹孔，热烟气从蜂窝结构的换热装置上部进入管程，冷空气进入蜂窝结构的换热装置壳程强制湍流换热，冷空气升温后完成换热过程。热烟气的垂直流程有效避免了受热面飞灰沉积和腐蚀，蜂窝管结构大大增加了受热面积和降低传热热阻，有效提高了换热效率。本发明具有成本低、适用范围广的优点，可满足不同冷热流体的换热要求。In summary, vertical honeycomb tubes are arranged in the heat exchange device of the present invention, and concave holes are distributed on the vertical honeycomb tubes. Hot flue gas enters the tube side from the upper part of the heat exchange device of the honeycomb structure, and cold air enters the heat exchange area of the honeycomb structure. The shell side of the device is forced to exchange heat with turbulent flow, and the heat exchange process is completed after the cold air is heated up. The vertical flow of hot flue gas effectively avoids the deposition and corrosion of fly ash on the heating surface. The honeycomb tube structure greatly increases the heating area and reduces the heat transfer resistance, effectively improving the heat exchange efficiency. The invention has the advantages of low cost and wide application range, and can meet the heat exchange requirements of different cold and hot fluids.
本发明中所描述的具体实施例仅是对本发明精神做举例说明，仅列举了热源为热烟气、企业排气，冷源为水和空气的实施例，但本领域技术人员知晓，本发明同样适用于其它冷源和热源的换热，并且可以根据实际需要选择合适的冷、热源，并可改变蜂窝结构换热器的管程和壳程的结构，以提高系统的运行效率。The specific embodiments described in the present invention are only to illustrate the spirit of the present invention, and only enumerate the embodiments in which the heat source is hot flue gas, enterprise exhaust, and the cold source is water and air, but those skilled in the art know that the present invention It is also applicable to heat exchange of other cold sources and heat sources, and the appropriate cold and heat sources can be selected according to actual needs, and the structure of the tube side and shell side of the honeycomb heat exchanger can be changed to improve the operating efficiency of the system.
尽管本发明较多地使用了热烟气入口1、冷烟气出口2、冷流体入口3、热流体出口4、壳体5、立式蜂窝管6等术语，但并不排除使用其他术语的可能性。使用这些术语仅仅是为了方便的描述和解释本发明的本质，把它们解释成任何一种附加的限制都是与本发明精神相违背的。Although the present invention frequently uses terms such as hot flue gas inlet 1, cold flue gas outlet 2, cold fluid inlet 3, hot fluid outlet 4, housing 5, and vertical honeycomb tube 6, it does not exclude the use of other terms possibility. These terms are used only for the convenience of describing and explaining the essence of the present invention, and it is against the spirit of the present invention to interpret them as any additional limitation.
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、技术延伸或再创造等，均应包含在本发明的保护范围之内。The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, technical extension or re-creation within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
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