Novel hot water treatment apparatus

Abstract

This utility model discloses a novel hot water treatment device, including a boiler body, a premixed burner, and a water-cooled circulating water circuit. The boiler body is a sealed vacuum container with an internal heat exchange tube assembly, which is connected to an inlet pipe and an outlet pipe. The premixed burner is connected to the boiler body and includes a mixer and a burner head connected to the mixer. The mixer is used to mix air and fuel gas. The burner head is located in the combustion chamber of the boiler body and connected to the premixing chamber of the mixer for igniting the mixed gas. The water-cooled circulating water circuit includes a circulating inlet, an outlet, and a water-cooling pipe. The water-cooling pipe surrounds the burner head and is used to cool the combustion zone to reduce the nitrogen oxide generation temperature.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology, and in particular to a novel hot water treatment device. Background Technology

[0002] In the field of hot water treatment equipment, traditional hot water boilers suffer from numerous problems during operation. During combustion, the high temperature in the combustion zone easily generates nitrogen oxides (NOx). NOx is a major air pollutant that contributes to acid rain, chemical smog, and other environmental problems, posing serious threats to the ecosystem and human health. With increasingly stringent environmental regulations, reducing NOx emissions from hot water boilers has become an urgent issue. Furthermore, existing hot water boilers lack adequate cooling measures for the combustion zone in their structural design. The high temperatures generated during combustion can easily cause thermal damage to the boiler body and related components, shortening the equipment's lifespan and increasing maintenance costs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a novel hot water treatment device that can cool the combustion zone through a water-cooled circulating water circuit, effectively reducing the combustion temperature, controlling the formation temperature of nitrogen oxides at a low level, and reducing thermal damage to the boiler body and related components caused by high temperatures, thereby reducing wear and aging of the equipment.

[0004] A novel hot water treatment device according to a first aspect of this utility model includes a boiler body, a premixed burner, and a water-cooled circulating water circuit. The boiler body is a sealed vacuum container with an internal heat exchange tube assembly, which is connected to an inlet pipe and an outlet pipe. The premixed burner is connected to the boiler body and includes a mixer and a burner head connected to the mixer. The mixer is used to mix air and fuel gas. The burner head is located in the combustion chamber of the boiler body and connected to the premixing chamber of the mixer for igniting the mixed gas. The water-cooled circulating water circuit includes a circulating inlet, an outlet, and a water-cooling pipe. The water-cooling pipe surrounds the burner head and is used to cool the combustion zone to reduce the nitrogen oxide generation temperature.

[0005] The novel hot water treatment equipment according to this utility model embodiment has at least the following beneficial effects: This novel hot water treatment equipment adopts premixed combustion technology, where air and fuel gas are fully and uniformly mixed in the mixer, resulting in more complete combustion, improved fuel utilization, and reduced energy waste. Compared with traditional hot water boilers, it can significantly reduce energy consumption and save operating costs. Furthermore, by cooling the combustion zone through a water-cooled circulating water system, the combustion temperature is effectively reduced, keeping the formation temperature of nitrogen oxides at a low level, thereby greatly reducing nitrogen oxide emissions. Simultaneously, due to complete combustion, the emissions of harmful gases such as carbon monoxide are also significantly reduced, meeting increasingly stringent environmental protection requirements and having a positive significance for environmental protection. Moreover, the water-cooled circulating water system cools the burner head and surrounding area, reducing high-temperature thermal damage to the boiler body and related components, reducing equipment wear and aging, and extending the equipment's service life. This reduces equipment maintenance costs and replacement frequency, improving the equipment's economy and reliability. In addition, the novel hot water treatment equipment proposed in this embodiment has a reasonable overall structural design, with compact connections and layouts between components, making it easy to manufacture and install. Compared to some hot water boilers that employ complex emission reduction technologies, this equipment achieves high efficiency and environmental protection while also being lower in cost, offering a high cost-performance ratio and facilitating large-scale promotion and application.

[0006] According to some embodiments of the present invention, the heat exchange tube assembly includes multiple straight tubes arranged in parallel, and both ends of the multiple straight tubes are fixed to the boiler body by mechanical expansion joints.

[0007] According to some embodiments of the present invention, a tube sheet is provided inside the boiler body, and multiple straight tubes are connected to the tube sheet through expansion tubes to form a heat exchange surface.

[0008] According to some embodiments of the present invention, the tube sheet is provided with a detachable cleaning port for physical cleaning of the inner wall of the heat exchange tube assembly.

[0009] According to some embodiments of the present invention, the boiler body is equipped with a controller, which is electrically connected to a digital vacuum gauge to ensure that the interior of the boiler body is always under negative pressure.

[0010] According to some embodiments of this utility model, a temperature sensor and a water level sensor are provided inside the boiler body. Both the temperature sensor and the water level sensor are electrically connected to the controller to acquire temperature and liquid level data inside the boiler body. If the temperature / liquid level exceeds a threshold, the premixed burner is controlled to stop working.

[0011] According to some embodiments of the present invention, an explosion-proof safety valve is provided on the top of the boiler body. The explosion-proof safety valve is electrically connected to the controller and is used to open the explosion-proof safety valve when the pressure inside the boiler body is abnormal.

[0012] According to some embodiments of the present invention, the mixer is connected to a variable frequency fan, the mixer is connected to gas through a pipeline equipped with a gas valve, and the variable frequency fan is used to accelerate the mixing rate of the gas in the mixer.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a novel hot water treatment device according to an embodiment of the present utility model.

[0015] Reference numerals: Boiler body 100; Heat exchanger tube assembly 110; Straight tube 111; Tube sheet 120; Inlet pipe 130; Outlet pipe 140; Premixed burner 200; Mixer 210; Burner head 220; Water-cooled tube 230; Variable frequency fan 240; Piping 250; Gas valve 251; Controller 300; Digital vacuum machine 310; Temperature sensor 320; Water level sensor 330; Explosion-proof safety valve 340. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0020] Reference Figure 1 The novel hot water treatment equipment of this embodiment mainly consists of three parts: a boiler body 100, a premixed burner 200, and a water-cooled circulating water circuit. These parts cooperate to achieve efficient and environmentally friendly hot water treatment. Specifically, the boiler body 100 adopts a sealed vacuum container design, which effectively reduces heat loss and improves thermal efficiency. It contains a heat exchange tube assembly 110, which is connected to an inlet pipe 130 and an outlet pipe 140. The inlet pipe 130 introduces cold water into the heat exchange tube assembly 110. As the cold water flows within the heat exchange tube assembly 110, it absorbs heat from the boiler body 100, and after heating, flows out from the outlet pipe 140 to provide hot water to users. The boiler body 100 is made of high-strength, high-temperature resistant alloy steel to ensure stable operation under high-temperature and high-pressure environments. Its cylindrical shape provides good structural strength and stability, while also facilitating the arrangement and installation of the internal heat exchange tube assembly 110.

[0021] The premixed burner 200 is connected to the boiler body 100 and mainly consists of a mixer 210 and a burner head 220. The mixer 210 mixes air and fuel gas, and its internal special flow-guiding structure allows the air and fuel gas to mix rapidly and thoroughly upon entering the mixer 210, forming a uniform gas mixture. One end of the mixer 210 is connected to an air intake pipe and a fuel gas intake pipe, respectively introducing air and fuel gas; the other end is connected to the burner head 220 via a pipe. The burner head 220 is located in the combustion chamber of the boiler body 100 and is connected to the premixing chamber of the mixer 210. The burner head 220 is made of a special material with excellent high-temperature resistance and oxidation resistance. Its porous structure allows the mixed gas to be sprayed out evenly and form a stable flame in the combustion chamber. When the mixed gas enters the burner head 220, it is ignited by an ignition device and undergoes complete combustion in the combustion chamber, releasing a large amount of heat to heat the water in the boiler body 100.

[0022] The water-cooled circulating water circuit includes a circulating inlet, an outlet, and water-cooled pipes 230. The water-cooled pipes 230 tightly surround the burner head 220, forming a cooling jacket. The inlet introduces cooling water into the water-cooled pipes 230. As the cooling water flows within the water-cooled pipes 230, it absorbs heat from the area surrounding the burner head 220, lowering the temperature of the combustion zone and effectively inhibiting the formation of nitrogen oxides. The heated cooling water flows out from the outlet and can be cooled by a heat dissipation device before being recycled. In actual operation, when the premixed burner 200 starts working, air and fuel gas are fully mixed in the mixer 210 and then enter the burner head 220 for combustion, generating a high-temperature flame to heat the boiler body 100. Simultaneously, the water-cooled circulating water circuit starts, and cooling water circulates within the water-cooled pipes 230, cooling the burner head 220 and its surrounding area. The cold water in the heat exchange tube assembly 110 within the boiler body 100 absorbs heat and heats up to provide hot water to users, achieving the function of hot water treatment.

[0023] Understandably, this novel hot water treatment equipment employs premixed combustion technology, where air and fuel gas are thoroughly and uniformly mixed within the mixer 210, resulting in more complete combustion, improved fuel utilization, and reduced energy waste. Compared to traditional hot water boilers, it significantly reduces energy consumption and saves operating costs. Furthermore, the water-cooled circulating water system effectively lowers the combustion temperature, controlling the formation temperature of nitrogen oxides at a lower level, thereby greatly reducing nitrogen oxide emissions. Simultaneously, due to complete combustion, emissions of harmful gases such as carbon monoxide are also significantly reduced, meeting increasingly stringent environmental protection requirements and contributing positively to environmental protection. Moreover, the water-cooled circulating water system cools the burner head 220 and surrounding area, reducing thermal damage to the boiler body 100 and related components from high temperatures, reducing wear and aging, and extending the equipment's service life. This reduces maintenance costs and replacement frequency, improving the equipment's economy and reliability. In addition, the novel hot water treatment equipment proposed in this embodiment has a reasonable overall structural design, with compact connections and layouts between components, making it easy to manufacture and install. Compared to some hot water boilers that employ complex emission reduction technologies, this equipment achieves high efficiency and environmental protection while also being lower in cost, offering a high cost-performance ratio and facilitating large-scale promotion and application.

[0024] Reference Figure 1 In the hot water treatment equipment of this utility model, the heat exchange tube assembly 110 adopts a structure of multiple parallel straight tubes 111. During the manufacturing and installation process, the multiple straight tubes 111 are first placed according to a predetermined spacing and arrangement to ensure that the straight tubes 111 are parallel and evenly spaced. Then, a special mechanical expansion joint is used to expand and fix both ends of the straight tubes 111 to the boiler body 100. The mechanical expansion joint uses mechanical force to make the outer wall of the straight tube 111 fit tightly against the inner wall of the corresponding mounting hole on the boiler body 100, forming a firm connection and ensuring the sealing and stability between the heat exchange tube assembly 110 and the boiler body 100. This design of the heat exchange tube assembly 110 with multiple parallel straight tubes 111 and mechanical expansion joints at both ends has many advantages. On the one hand, the parallel arrangement of straight pipes 111 makes the water flow more smoothly within the heat exchange tube assembly 110, reducing water flow resistance and improving water circulation efficiency, thereby enhancing the heat exchange effect. This allows for faster transfer of heat from the boiler body 100 to the water, improving the efficiency of hot water supply. On the other hand, compared to other connection methods such as welding, the mechanical expansion joint provides more reliable connection strength, effectively avoiding loosening or leakage caused by thermal expansion and contraction. This ensures long-term stable operation of the equipment and reduces energy waste and safety hazards caused by leaks.

[0025] Furthermore, in some embodiments, a tube sheet 120 is installed inside the boiler body 100. The tube sheet 120 is typically made of a metal material with certain strength and corrosion resistance. When installing the heat exchange tube assembly 110, multiple straight tubes 111 are connected to the tube sheet 120 using a tube expansion process. Specifically, a tube expander is used to insert one end of the straight tube 111 into the corresponding hole on the tube sheet 120. Then, through the expansion action of the tube expander, the outer wall of the straight tube 111 is tightly fitted with the inner wall of the hole in the tube sheet, forming a reliable sealed connection. After multiple straight tubes 111 are connected to the tube sheet 120 in this way, a large heat exchange surface is formed inside the boiler body 100, which can more fully realize heat exchange. The design of forming a heat exchange surface by connecting the tube sheet 120 and the straight tubes 111 through tube expansion brings significant beneficial effects. First, this structure increases the heat exchange area, enabling more heat to be transferred per unit time, improving thermal efficiency, and providing hot water to users more efficiently to meet different usage needs. Secondly, the tube sheet 120 serves to support and fix the straight tubes 111, enhancing the overall structural strength of the heat exchange tube assembly 110. This allows the heat exchange tube assembly 110 to operate stably inside the boiler body 100, making it less susceptible to deformation or damage due to water flow impact and thermal stress, thus extending the service life of the equipment.

[0026] Optionally, a removable cleaning port is provided on the tube sheet 120. The cleaning port is typically circular or square, and its size is designed according to actual cleaning needs and the structure of the tube sheet 120. The cleaning port is fixed to the tube sheet 120 by bolts or other detachable connection methods. When it is necessary to clean the inner wall of the heat exchange tube assembly 110, simply unscrew the bolts connecting the cleaning port, remove the cleaning port cover, and the cleaning tool can be inserted into the heat exchange tube for physical cleaning. After cleaning, reinstall the cleaning port cover and tighten the bolts to ensure sealing. It is easy to understand that the removable cleaning port is of great significance. During long-term operation, scale, impurities, and other dirt will inevitably accumulate on the inner wall of the heat exchange tubes. This dirt will reduce heat exchange efficiency and affect the normal operation of the equipment. By providing a removable cleaning port, the inner wall of the heat exchange tubes can be physically cleaned conveniently and quickly without the need for large-scale disassembly of the entire equipment, greatly reducing the difficulty and cost of cleaning. Regular cleaning can maintain the good heat exchange performance of heat exchange tubes, ensure that the equipment is always in a state of high efficiency, improve energy utilization, and extend the service life of the equipment.

[0027] Reference Figure 1In this embodiment, a controller 300 is installed on the boiler body 100. The controller 300 is typically a microcomputer controller with data processing and control functions. A digital vacuum gauge is electrically connected to the controller 300 via a line. The digital vacuum gauge is installed in a suitable position inside the boiler body 100 and can accurately measure the vacuum level inside the boiler body 100, transmitting the measurement data to the controller 300 in real time. The controller 300 analyzes and judges the data fed back by the digital vacuum gauge according to preset programs and parameters. When the vacuum level inside the boiler body 100 deviates from the set range, the controller 300 will issue a command to adjust the operation of relevant equipment (such as a vacuum pump, not shown in the figure) to maintain a negative pressure state inside the boiler body 100. Setting up the controller 300 and digital vacuum gauge to maintain a negative pressure state inside the boiler body 100 has many beneficial effects. Maintaining a negative pressure state can improve the thermal efficiency of the boiler because the boiling point of water is lowered under negative pressure, allowing it to boil and vaporize at a lower temperature, thereby accelerating the heat transfer rate and improving energy utilization efficiency. Meanwhile, the negative pressure helps reduce the oxygen content inside the boiler body 100, slowing down the oxidation and corrosion rate of metal components and extending the service life of the equipment. Furthermore, the controller 300 can monitor and adjust the vacuum level in real time, ensuring the stability and reliability of the equipment operation and avoiding equipment failures and safety hazards caused by abnormal vacuum levels.

[0028] Furthermore, a temperature sensor 320 and a water level sensor 330 are installed inside the boiler body 100. The temperature sensor 320 typically uses a thermocouple or resistance temperature detector (RTD) to accurately measure the water temperature inside the boiler body 100. The water level sensor 330 can be of different types, such as float type or electrode type, and is used to detect the water level inside the boiler body 100. The temperature sensor 320 and the water level sensor 330 are electrically connected to the controller 300 via wiring. The controller 300 has preset thresholds for temperature and liquid level. During equipment operation, the temperature sensor 320 and the water level sensor 330 transmit the measured temperature and liquid level data to the controller 300 in real time. The controller 300 processes and analyzes the data. When the temperature or liquid level exceeds the preset threshold, the controller 300 immediately sends a control signal to cut off the gas supply to the premixed burner 200, causing the premixed burner 200 to stop working and preventing equipment damage or safety accidents due to excessive temperature or abnormal water level. The design of temperature sensor 320 and water level sensor 330 working in conjunction with controller 300 provides crucial protection for the safe operation of the equipment. By monitoring the temperature and liquid level data within the boiler body 100 in real time and promptly stopping the premixed burner 200 when thresholds are exceeded, it effectively prevents dangerous situations such as boiler dry burning, equipment damage, or even explosions caused by excessively high temperatures, as well as equipment instability due to abnormal water levels. This safety protection mechanism improves the reliability and safety of the equipment, reduces the likelihood of accidents, and protects the personal and property safety of users.

[0029] Furthermore, an explosion-proof safety valve 340 is installed on the top of the boiler body 100. The explosion-proof safety valve 340 is connected to the boiler body 100 via a dedicated connecting pipe and flange to ensure reliable sealing. The explosion-proof safety valve 340 is electrically connected to the controller 300, which has a preset pressure threshold within the boiler body 100. During equipment operation, the pressure within the boiler body 100 will change due to factors such as combustion and water circulation. When the pressure sensor (not shown in the figure) detects an abnormal increase in pressure within the boiler body 100 exceeding the preset threshold, the controller 300 immediately sends an electrical signal to the explosion-proof safety valve 340. Upon receiving the signal, the explosion-proof safety valve 340 quickly opens, releasing the excessive pressure within the boiler body 100 to the outside, restoring the pressure within the boiler body 100 to the normal range, and preventing serious accidents such as boiler body 100 rupture due to excessive pressure. The explosion-proof safety valve 340, electrically connected to the controller 300 at the top, provides reliable safety protection for the equipment. When the pressure inside the boiler body 100 abnormally increases, the explosion-proof safety valve 340 can open in time to release the pressure, preventing catastrophic accidents such as boiler explosions due to excessive pressure, and ensuring the safety of the equipment and the surrounding environment. Simultaneously, through electrical connection with the controller 300, the explosion-proof safety valve 340 achieves automated control, enabling faster and more accurate responses to abnormal pressure situations, improving the timeliness and effectiveness of safety protection, and further enhancing the safety and reliability of the equipment.

[0030] Reference Figure 1 The mixer 210 is connected to a variable frequency fan 240 via a pipe 250. The variable frequency fan 240 can adjust its speed according to a control signal, thereby changing the air volume. The mixer 210 is also connected to a gas source via a pipe 250 equipped with a gas valve 251, which controls the on / off state and flow rate of the gas. When the equipment starts up, the variable frequency fan 240 is controlled to operate at a corresponding speed according to preset parameters, while the gas valve 251 is opened to a suitable degree, allowing air and gas to enter the mixer 210 in a certain ratio. The high-speed airflow generated by the variable frequency fan 240 can accelerate the mixing rate of air and gas in the mixer 210, enabling the air and gas to be fully and evenly mixed in a short time to form a high-quality mixed gas, which then enters the burner head 220 for combustion. The variable frequency fan 240 can flexibly adjust the air volume according to actual needs. When used in conjunction with the gas valve 251, it can precisely control the mixing ratio of air and gas, achieving the best combustion effect under different operating conditions, improving combustion efficiency, and reducing energy waste. Meanwhile, accelerating the mixing rate of gases within mixer 210 enables more complete and stable combustion, reducing emissions of harmful gases such as carbon monoxide and meeting environmental protection requirements. Furthermore, this design allows for real-time adjustment of operating parameters based on equipment load changes, improving the equipment's adaptability and flexibility, and ensuring efficient and stable operation in various usage scenarios.

[0031] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A novel hot water treatment device, characterized in that, include: The boiler body is a sealed vacuum container with a heat exchange tube assembly inside, which is connected to an inlet pipe and an outlet pipe respectively. A premixed burner, connected to the boiler body, includes a mixer and a burner head connected to the mixer. The mixer is used to mix air and fuel gas. The burner head is disposed in the combustion chamber of the boiler body and connected to the premixing chamber of the mixer for igniting the mixed gas. The water-cooled circulating water circuit includes a circulating inlet, an outlet, and a water-cooling pipe. The water-cooling pipe surrounds the burner head and is used to cool the combustion zone to reduce the nitrogen oxide generation temperature.

2. The novel hot water treatment equipment according to claim 1, characterized in that, The heat exchange tube assembly includes multiple straight tubes arranged in parallel, and both ends of the multiple straight tubes are fixed to the boiler body by mechanical expansion joints.

3. The novel hot water treatment equipment according to claim 2, characterized in that, The boiler body is equipped with a tube sheet, and multiple straight tubes are connected to the tube sheet through expansion tubes to form a heat exchange surface.

4. The novel hot water treatment equipment according to claim 3, characterized in that, The tube sheet is provided with a removable cleaning port for physical cleaning of the inner wall of the heat exchange tube assembly.

5. The novel hot water treatment equipment according to claim 1, characterized in that, The boiler body is equipped with a controller, which is electrically connected to a digital vacuum gauge to ensure that the inside of the boiler body is always under negative pressure.

6. The novel hot water treatment equipment according to claim 5, characterized in that, The boiler body is equipped with a temperature sensor and a water level sensor, both of which are electrically connected to the controller to acquire temperature and liquid level data within the boiler body. If the temperature / liquid level exceeds a threshold, the controller will stop the premixed burner from operating.

7. The novel hot water treatment equipment according to claim 5, characterized in that, An explosion-proof safety valve is installed on the top of the boiler body. The explosion-proof safety valve is electrically connected to the controller and is used to open the explosion-proof safety valve when the pressure inside the boiler body is abnormal.

8. The novel hot water treatment equipment according to claim 1, characterized in that, The mixer is connected to a variable frequency fan, and the mixer is connected to gas through a pipeline equipped with a gas valve. The variable frequency fan is used to accelerate the mixing rate of the gas in the mixer.

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