Plant exhaust and ventilation equipment

Abstract

The utility model discloses plant exhaust and ventilation equipment, and relates to the technical field of ventilation equipment. The plant exhaust and ventilation equipment comprises an air inducing device and an air supply device, the air inducing device is provided with a first air inlet and a first air outlet, and the first air inlet is communicated with the interior of a plant through a first exhaust pipe; the air supply device is provided with a second air inlet and a second air outlet, the first air outlet is communicated with the second air inlet through a second exhaust pipe, and the second air outlet is communicated with a combustion cavity of the coal-fired boiler through a third exhaust pipe; according to the plant exhaust and ventilation equipment provided by the utility model, the exhaust gas containing organic pollutants generated in the plant can be firstly exhausted by starting the air inducing device, then the exhaust gas is conveyed into the combustion cavity of the coal-fired boiler through the air supply device to be used as combustion air, and finally the exhaust gas is exhausted through the chimney of the coal-fired boiler after the exhaust gas is detected to reach the standard. On one hand, continuous ventilation in a plant is facilitated, and on the other hand, exhausted waste gas can be conveniently used as a combustion improver to promote production.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation equipment, in particular to a plant exhaust and ventilation equipment. Background Art

[0002] In enclosed factory environments, maintaining good air circulation and ventilation is crucial for ensuring productivity and employee health. Currently, two main strategies are used for ventilation within workshops. The first is to install a series of unpowered fans on the factory roof to achieve natural ventilation. While this method requires no additional energy, its exhaust volume is relatively limited, particularly in calm or light wind conditions, where ventilation effectiveness is significantly reduced. It may only achieve some ventilation effectiveness in strong winds (e.g., between 2,000 and 6,000 cubic meters per hour). In still wind conditions, it rarely improves air circulation within the workshop. Furthermore, the installation of unpowered roof fans often damages the existing roof structure. Over time, vibration and aging from the fans can lead to leaks, increasing maintenance costs. Furthermore, unpowered fans cannot precisely control ventilation volume like advanced mechanical ventilation systems, making them unsuitable for environments requiring strict control of environmental parameters, such as precision manufacturing workshops or chemical laboratories.

[0003] Another common method for workshop ventilation involves the use of VOC (volatile organic compound) collection and adsorption technology. Activated carbon adsorption is currently the most widely used VOC treatment method. This method relies on the powerful natural adsorption capacity of activated carbon, effectively capturing and immobilizing VOC molecules in the air. However, as the adsorption process progresses, the activated carbon gradually reaches saturation, requiring desorption and regeneration by a specialized hazardous waste disposal company. This not only increases treatment costs but also raises concerns about the safe disposal of the waste. Furthermore, the physical adsorption properties of activated carbon dictate its limited adsorption capacity and the saturation limit. Over time and as the adsorbent depletes, its adsorption capacity gradually weakens, potentially requiring frequent replacement or regeneration, impacting its economic and efficient use. Furthermore, activated carbon adsorption also faces the issue of specificity. Its adsorption effectiveness can be significantly reduced for complex gas mixtures, especially when the gas molecule diameter does not match the activated carbon pore size. This can cause desorption of adsorbed VOCs, further reducing treatment effectiveness.

[0004] In summary, both unpowered fan exhaust and VOCs collection and adsorption treatment have certain limitations in practical applications. Utility Model Content

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies in the related art, and the present invention provides a factory exhaust ventilation device.

[0006] The utility model provides the following technical solutions:

[0007] A factory building exhaust ventilation device is used for exhausting and exchanging air inside the factory building. The factory building exhaust ventilation device comprises an air induced device and an air supply device.

[0008] The air induced device has a first air inlet and a first air outlet, and the first air inlet is connected to the interior of the factory building through a first exhaust duct; the air supply device has a second air inlet and a second air outlet, the first air outlet is connected to the second air inlet through a second exhaust duct, and the second air outlet is connected to the combustion chamber of the coal-fired boiler through a third exhaust duct.

[0009] As a further improvement of the above technical solution, an air regulating valve is installed on the first exhaust duct, and the air regulating valve is used to adjust the excess air volume of the first exhaust duct.

[0010] As a further improvement of the above technical solution, the factory exhaust ventilation equipment also includes a control module, a flow meter is provided on the third exhaust duct, and the control module is electrically connected to the flow meter and the air regulating valve respectively.

[0011] As a further improvement of the above technical solution, the second air inlet is further connected to an external air supply pipe, and the air supply pipe is connected to the outside atmosphere at an opening away from the air supply device.

[0012] As a further improvement of the above technical solution, the air supply pipe is vertically arranged, and the opening of the air supply pipe is located at the upper end of the air supply pipe.

[0013] As a further improvement of the above technical solution, the upper opening of the air supply pipe is equipped with a shielding cover.

[0014] As a further improvement of the above technical solution, the top of the shielding cover is conical.

[0015] As a further improvement of the above technical solution, a support frame is provided in the air supply pipe, and a telescopic rod is provided on the support frame. The movable end of the telescopic rod is fixedly connected to the shielding cover, and the telescopic rod can drive the shielding cover closer to or away from the upper end opening of the air supply pipe.

[0016] As a further improvement of the above technical solution, a guide groove is provided on the inner side wall of the air supply pipe, and a guide rod corresponding to the guide groove is provided on the shielding cover. The guide rod is arranged in the guide groove, and the telescopic rod is retracted to drive the guide rod to move along the guide groove. There are multiple guide grooves axially evenly distributed relative to the axis of the air supply pipe.

[0017] As a further improvement of the above technical solution, an air induced draft hood is provided at the end of the first exhaust duct facing away from the air induced draft device, and the air induced draft hood has a first opening and a second opening, the opening area of ​​the first opening is smaller than the opening area of ​​the second opening, the first opening is connected to the first exhaust duct, and the second opening is connected to the interior of the factory building.

[0018] As a further improvement of the above technical solution, cleaning doors are provided on the side walls of the first exhaust duct, the second exhaust duct, and the third exhaust duct.

[0019] As a further improvement of the above technical solution, the connection position between the first exhaust duct and the factory building is higher than the setting position of the air inducing device.

[0020] As a further improvement of the above technical solution, the first exhaust duct is connected to the side wall of the factory building.

[0021] Compared with the related art, the beneficial effects of the present invention are:

[0022] The factory exhaust ventilation equipment designed by the present invention can provide negative pressure inside the factory by starting the draft device during use, thereby guiding the waste gas rich in organic pollutants generated by production activities in the factory to flow along the first exhaust pipe. The waste gas is initially collected in this process, and then enters the interior of the draft device through the first air inlet, achieving a smooth transition from the pollution source to the treatment unit. Inside the draft device, the waste gas is further compressed and accelerated, and finally ejected from the first air outlet of the draft device. This waste gas then flows into the second exhaust pipe. At this time, the air supply device intervenes in time, and with its powerful pumping capacity, it sends the waste gas in the second exhaust pipe into the third exhaust pipe. This process not only ensures the continuity of waste gas transmission, but also avoids any possible leakage, thereby ensuring the safety of the working environment.

[0023] Crucially, these pumped exhaust gases are not simply discharged into the environment. Instead, they are introduced into the combustion chamber of the coal-fired boiler, serving as combustion-supporting gas to aid combustion. Through the high-temperature combustion of the coal-fired boiler, organic matter in the exhaust gas is completely broken down, and harmful components are converted into harmless or less harmful substances, achieving a seamless transformation of the exhaust gas from a pollution source to a resource for utilization. This process not only significantly reduces environmental pollution from exhaust gas but also indirectly promotes the smooth operation of production activities by improving the boiler's combustion efficiency.

[0024] In summary, the factory exhaust ventilation equipment provided by the present invention not only realizes the continuous and efficient exhaust and ventilation of the air inside the factory, but also cleverly converts the exhaust gas into a power source to promote production, thereby promoting production.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It shows a schematic structural diagram of a factory exhaust ventilation device from one perspective in one embodiment of the present utility model;

[0028] Figure 2 A structural cross-sectional view from one perspective of an air supply duct in one embodiment of the present invention is shown.

[0029] Description of main component symbols:

[0030] 100-factory building; 200-draft induced draft device; 210-first air inlet; 220-first air outlet; 310-first exhaust duct; 311-air regulating valve; 320-second exhaust duct; 330-third exhaust duct; 331-flow meter; 340-supply air duct; 341-shielding cover; 342-guide groove; 343-guide rod; 350-draft hood; 400-air supply device; 410-second air inlet; 420-second air outlet; 500-coal-fired boiler; 610-telescopic rod; 620-support frame. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] like Figure 1 As shown, this embodiment provides a factory exhaust ventilation device for exhausting and ventilating the interior of a factory 100 , and the factory exhaust ventilation device includes an air induced device 200 and an air supply device 400 .

[0037] The air induced device 200 has a first air inlet 210 and a first air outlet 220, and the first air inlet 210 is connected to the interior of the factory building 100 through a first exhaust pipe 310; the air supply device 400 has a second air inlet 410 and a second air outlet 420, and the first air outlet 220 is connected to the second air inlet 410 through a second exhaust pipe 320, and the second air outlet 420 is connected to the combustion chamber of the coal-fired boiler 500 through a third exhaust pipe 330.

[0038] The factory exhaust ventilation equipment provided in this embodiment can provide negative pressure inside the factory 100 by activating the induced draft device 200 during use, thereby guiding the exhaust gas rich in organic pollutants generated by production activities in the factory 100 to flow along the first exhaust pipe. The exhaust gas is initially collected in this process and then enters the induced draft device 200 through the first air inlet 210, achieving a smooth transition from the pollution source to the treatment unit. Inside the induced draft device 200, the exhaust gas is further compressed and accelerated, and finally ejected from the first air outlet 220 of the induced draft device 200. This exhaust gas then flows into the second exhaust pipe. At this time, the air supply device 400 intervenes in time and, with its powerful pumping capacity, sends the exhaust gas in the second exhaust pipe into the third exhaust pipe. This process not only ensures the continuity of exhaust gas transmission, but also avoids any possible leakage, thereby ensuring the safety of the working environment.

[0039] Crucially, these pumped exhaust gases are not simply discharged to the outside world. Instead, they are introduced into the combustion chamber of coal-fired boiler 500, serving as combustion-supporting gas to aid combustion. Through the high-temperature combustion of coal-fired boiler 500, organic matter in the exhaust gases is thoroughly decomposed, and harmful components are converted into harmless or less harmful substances, transforming the exhaust gases from a pollution source to a resource for utilization. This process not only significantly reduces environmental pollution from exhaust gases but also indirectly promotes the smooth operation of production activities by improving the boiler's combustion efficiency.

[0040] To sum up, the factory exhaust ventilation equipment provided by the utility model not only realizes the continuous and efficient exhaust ventilation of the air inside the factory 100, but also cleverly converts the exhaust gas into a power source to promote production, which not only ensures the health and safety of the production environment, but also actively responds to the environmental protection call for energy conservation and emission reduction. It is a powerful practice to promote the green development of industry.

[0041] It is important to note that when discussing the environmental protection measures for extracting the exhaust gas containing organic pollutants, such as benzene, from the plant 100 through a specific method and feeding it into the coal-fired boiler 500 for efficient combustion treatment, it is necessary to explain in detail several key links. First, it is important to emphasize that environmental protection regulations set strict limits on the emission of harmful organic pollutants such as benzene, generally requiring that the concentration of benzene discharged into the atmosphere shall not exceed 4mg / m3.3 This standard is intended to protect the environment and public health by preventing the excessive release of hazardous substances.

[0042] Next, we assume that in a certain situation, the benzene content in the exhaust gas of the plant 100 is high. In the extreme case of 4000 mg / m 3 To more intuitively understand this concentration level, we can convert it into volume concentration. Using information on the gas molecular weight (assuming 78 g / mol, approximated here by the molecular weight of nitrogen, as actual calculations require the specific molecular weight of benzene), combined with the ideal gas state equation, we can calculate the volume fraction of benzene in the exhaust gas to be approximately 1149 ppm, or 0.0115% (1,149 parts per million).

[0043] Furthermore, we need to assess the safety risks at this concentration level. Benzene, a flammable and explosive substance, has a deflagration limit (at atmospheric pressure and 20°C) defined as a concentration between 1.2% and 8% by volume. By comparison, we can clearly see that even in the hypothetical high-concentration emission scenario, the concentration of benzene in the exhaust gas is well below its deflagration limit, significantly reducing the risk of explosion accidents during transportation and handling.

[0044] Furthermore, the ignition temperature of benzene is also a key parameter in assessing its safety. The minimum ignition temperature of benzene is as high as 560°C, meaning that during normal transportation and combustion processes, proper temperature control to avoid reaching this critical value effectively prevents spontaneous combustion of benzene.

[0045] In summary, ducting waste gas containing organic pollutants such as benzene from plant 100 to coal-fired boiler 500 for combustion treatment is safe and feasible, provided that operating procedures are strictly adhered to, waste gas concentrations are kept below safety limits, and the temperature during treatment is effectively controlled. This treatment method not only effectively reduces harmful emissions but also realizes resource utilization of waste gas, aligning with the concept of sustainable development and environmental protection.

[0046] In some specific embodiments, the induced draft device 200 is specifically designated as a centrifugal induced draft fan. This type of fan, with its efficient centrifugal action, plays a vital role in industrial production environments, particularly in applications requiring large-scale air replacement. Accordingly, the air supply device 400 utilizes a boiler blower, specifically designed for air delivery in high-temperature and high-pressure environments, ensuring the stability and safety of the air supply process.

[0047] When using centrifugal induced draft fans to extract and ventilate large factory buildings 100, the flexibility of system design is fully demonstrated. The specifications and models of centrifugal induced draft fans can be accurately selected based on the actual volume of the factory building 100, its internal layout, and the specific needs of production activities. For example, for a factory building 100 with a volume of approximately 1,500 cubic meters, in order to ensure continuously excellent air quality, the air exchange rate is usually set at 8 times per hour based on industry experience. Based on this standard, it can be calculated that the required exhaust volume in the factory building 100 is 12,000 cubic meters per hour, and this exhaust process must be maintained continuously to meet the ventilation needs of the production environment.

[0048] When selecting a centrifugal induced draft fan, its rated air volume is a key parameter. To ensure that the exhaust requirements of Factory 100 are effectively met under all operating conditions, while leaving a margin to accommodate emergencies or seasonal changes, a fan with a rated air volume slightly greater than the calculated exhaust volume is typically selected. Therefore, in the above example, the fan's rated air volume was set at 15,000 cubic meters per hour, slightly higher than the required exhaust volume of 12,000 cubic meters per hour for Factory 100, thus ensuring system stability and reliability.

[0049] In some specific embodiments, the first exhaust duct 310 is equipped with an air regulating valve 311. This air regulating valve 311 is designed to precisely control the amount of air passing through the first exhaust duct 310, also known as the "excess air volume." By rotating or adjusting the opening degree of the air regulating valve 311, the amount of air flowing through the duct can be flexibly increased or decreased in real time, thereby achieving precise control of the air volume distribution throughout the ventilation system.

[0050] This design not only helps optimize indoor air circulation and reduce unnecessary energy consumption, but also quickly responds to environmental changes, such as changes in indoor temperature, humidity, or harmful gas concentrations, by adjusting the exhaust volume to maintain indoor comfort and safety. Furthermore, the introduction of air damper 311 enhances the system's maintainability and troubleshooting capabilities. When other components in the duct need to be repaired or replaced, the air path can be temporarily changed by closing or adjusting air damper 311, ensuring smooth maintenance without affecting the normal operation of the overall ventilation system.

[0051] In some specific embodiments, the factory building ventilation equipment further includes a control module. A flowmeter 331 is provided on the third exhaust duct 330. The control module is electrically connected to the flowmeter 331 and the air control valve 311. Specifically, the flowmeter 331 continuously and accurately measures the air flow rate (i.e., the excess air volume) passing through it in real time. Data collected by the flowmeter 331 is instantly transmitted to the control module for processing via a pre-set electrical connection or wireless communication method. The control module integrates advanced algorithms and logic mechanisms, enabling rapid analysis of received excess air volume data and comparing it against a preset threshold in the system. This threshold is determined based on the operating characteristics of the coal-fired boiler 500, the environmental requirements within the factory building 100, and the design parameters of the ventilation system. This ensures that the ventilation process meets production requirements while not adversely affecting the normal operation of the coal-fired boiler 500.

[0052] Once the excess airflow data within the third exhaust duct 330 exceeds a preset threshold, the control module responds quickly and automatically activates the regulation mechanism. By sending a control signal to the air control valve 311, the control module precisely adjusts the opening of the air control valve 311, thereby finely regulating the excess airflow within the third exhaust duct 330. This process is dynamic and continuous. The control module continuously adjusts the control strategy based on real-time data until the excess airflow is stabilized within a reasonable range, effectively preventing potential impacts on the efficiency, safety, or service life of the coal-fired boiler 500 caused by excessive or insufficient excess airflow.

[0053] In some specific embodiments, the second air inlet 410 is also externally connected to an air supply pipe 340, and the air supply pipe 340 is connected to the outside atmosphere away from the opening of the air supply device 400; when the air supply volume delivered by the induced draft device 200 to the air supply device 400 is too small, the air supply device 400 can draw air flow from the atmosphere through the air supply pipe 340 for supplementary operation, thereby ensuring the normal operation of the coal-fired boiler 500.

[0054] In some specific embodiments, the air supply pipe 340 is vertically arranged, and the opening of the air supply pipe 340 is located at the upper end of the air supply pipe 340. This design cleverly utilizes the principle of gravity and the natural rise of air, so that in the process of the air supply pipe 340 sucking air, it can avoid inhaling dust, impurities or other foreign matter near the ground to the greatest extent.

[0055] By keeping the opening of the air supply duct 340 high, we ensure the quality of air entering the system and reduce the risk of system blockage, wear, or performance degradation caused by foreign matter. This design not only extends the service life of the air supply duct 340 and its related components, but also maintains the stability and reliability of the exhaust and ventilation equipment as a whole.

[0056] In some specific embodiments, a shielding cover 341 is installed at the upper opening of the air supply duct 340. In actual use, the shielding cover 341 can effectively block foreign objects such as leaves, dust, and small animals from falling into the air supply duct 340 and causing blockage or damage. This design not only ensures the unobstructed flow of the air supply duct 340, but also extends its service life and reduces maintenance costs caused by foreign object intrusion.

[0057] In addition, the shielding cover 341 also has a certain waterproof function, which can protect the inside of the air supply pipe 340 from rainwater invasion under adverse weather conditions such as rainy days, thereby ensuring the normal operation of the air supply pipe 340.

[0058] In some specific embodiments, the top of the shielding cover 341 is conical. The design of the conical top, first of all, forms a natural guiding mechanism in physical form. When foreign objects falling in the air, such as fallen leaves, dust or other small objects, accidentally touch the shielding cover 341, they will naturally slide down along the slope of the cone instead of staying on the surface of the shielding cover 341 and forming accumulations.

[0059] This discrete guidance effect is crucial for keeping shielding cover 341 clean and unobstructed. It effectively prevents foreign matter from accumulating on shielding cover 341 for extended periods, thereby avoiding blockage of the air supply duct 340 entrance caused by foreign matter accumulation. Furthermore, the conical design offers a certain degree of self-cleaning capability. Even in rainy weather, rainwater quickly flows along the conical surface, removing dust and dirt from the surface and maintaining the cleanliness of shielding cover 341.

[0060] like Figure 2 As shown, in some specific embodiments, a support frame 620 is provided in the air supply pipe 340, and a telescopic rod 610 is provided on the support frame 620. The movable end of the telescopic rod 610 is fixedly connected to the shielding cover 341. The telescopic rod 610 can drive the shielding cover 341 closer to or away from the upper end opening of the air supply pipe 340 by telescoping. By precisely controlling the extension and shortening of the telescopic rod 610, the system can easily adjust the relative position between the shielding cover 341 and the upper end opening of the air supply pipe 340.

[0061] When the air supply system is not in operation, that is, when air supply through the opening of the air supply pipe 340 is not required, the operator can simply activate the telescopic rod 610 to drive it to retract, so that the shielding cover 341 is tightly attached to or close to the upper end opening of the air supply pipe 340. This action effectively seals the opening, preventing the unexpected intrusion of external impurities, dust, small animals, etc., providing necessary protection and maintenance for the air supply system and extending its service life.

[0062] Conversely, when air needs to be supplied through the air supply duct 340, the telescopic rod 610 will operate in the reverse direction under control, slowly extending and moving the shielding cover 341 away from the upper opening of the air supply duct 340 until the opening is completely unblocked. This process is both smooth and rapid, ensuring the immediacy and effectiveness of the air supply operation, meeting the ventilation needs of different scenarios.

[0063] Furthermore, the system is highly adjustable, allowing users to precisely control the degree of opening between the shielding cover 341 and the upper opening of the air supply duct 340 by fine-tuning the extension and retraction of the telescopic rod 610 as needed. This feature greatly enhances the flexibility and adaptability of the air supply process, making it easy to handle both small adjustments to ventilation volume and complex, ever-changing ventilation environments, ensuring optimal air supply results.

[0064] In some specific embodiments, a guide groove 342 is provided on the inner side wall of the air supply pipe 340, and a guide rod 343 corresponding to the guide groove 342 is provided on the shielding cover 341. The guide rod 343 is arranged in the guide groove 342, and the telescopic rod 610 can drive the guide rod 343 to move along the guide groove 342. There are multiple guide grooves 342 evenly distributed axially relative to the axis of the air supply pipe 340, which is convenient for guiding the moving trajectory of the shielding cover 341 relative to the air supply pipe 340.

[0065] In some specific embodiments, an air hood 350 is provided at the end of the first exhaust duct 310 facing away from the draft device 200. The draft hood 350 employs a dual-opening structure, namely a first opening and a second opening. The first opening is directly connected to the first exhaust duct 310 and is designed to be relatively small in area to ensure that the draft device 200 creates a sufficient negative pressure area to effectively attract and extract exhaust gas from the factory building 100. The second opening, facing the interior of the factory building 100, has a significantly larger opening area than the first opening. This design allows the draft hood 350 to provide a wider suction surface.

[0066] When the draft device 200 is activated, the negative pressure generated by the first exhaust duct 310 first acts on the first opening of the draft hood 350, then quickly spreads to the wide area covered by the second opening. Due to the larger opening area of ​​the second opening, it can effectively capture and guide exhaust gas from all corners of the factory building 100 toward the draft hood 350, thereby greatly improving the exhaust gas extraction efficiency. This design not only accelerates the flow of exhaust gas, but also ensures that exhaust gas is extracted comprehensively and evenly within the factory building 100, avoiding localized exhaust gas stagnation or accumulation.

[0067] In some specific embodiments, cleaning doors are provided on the side walls of the first exhaust duct 310 , the second exhaust duct 320 , and the third exhaust duct 330 , so as to facilitate regular cleaning of the interior of each exhaust duct.

[0068] In some specific embodiments, the connection point between the first exhaust duct 310 and the factory building 100 is higher than the location of the draft device 200. First, because exhaust gas often carries a certain amount of dust particles or other small impurities during its flow, if the connection point between the first exhaust duct 310 and the factory building 100 is too low, these dust particles are easily deposited inside the duct under the action of gravity. After long-term accumulation, it may cause duct blockage, affecting exhaust efficiency and even damaging equipment. However, setting the connection point higher than the draft device 200 and utilizing the inherent upward flow characteristics of the exhaust gas can greatly reduce the chance of dust particles depositing in the duct, keeping the duct unobstructed.

[0069] In addition, this design also helps improve the operational stability of the entire exhaust system. Due to the reduction of dust particles, the resistance that the induced draft device 200 needs to overcome when extracting exhaust gas is also reduced, thereby reducing energy consumption and wear of the equipment and extending its service life.

[0070] In some specific embodiments, the first exhaust duct 310 is connected to the side wall of the factory building 100 to avoid being arranged at the top of the factory building 100 at the connection point, thereby reducing the probability of water leakage in the factory building 100.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0072] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A factory building ventilation device for exhausting and exchanging air inside a factory building (100), characterized in that: The plant exhaust ventilation equipment includes: An air induction device (200), the air induction device (200) having a first air inlet (210) and a first air outlet (220), the first air inlet (210) being in communication with the interior of the factory building (100) via a first exhaust pipe (310); An air supply device (400) is provided, wherein the air supply device (400) has a second air inlet (410) and a second air outlet (420), wherein the first air outlet (220) is connected to the second air inlet (410) via a second exhaust pipe (320), and the second air outlet (420) is connected to the combustion chamber of a coal-fired boiler (500) via a third exhaust pipe (330).

2. The factory exhaust ventilation equipment according to claim 1, characterized in that: An air regulating valve (311) is installed on the first exhaust pipe (310), and the air regulating valve (311) is used to adjust the air flow rate of the first exhaust pipe (310).

3. The factory exhaust ventilation equipment according to claim 2, characterized in that: The factory building ventilation equipment further comprises a control module. A flow meter (331) is provided on the third exhaust pipe (330). The control module is electrically connected to the flow meter (331) and the air regulating valve (311) respectively.

4. The factory exhaust ventilation equipment according to claim 3, characterized in that: The second air inlet (410) is also externally connected to an air supply pipe (340), and the opening of the air supply pipe (340) facing away from the air supply device (400) is connected to the outside atmosphere.

5. The factory exhaust ventilation equipment according to claim 4, characterized in that: The air supply pipe (340) is vertically arranged, and the opening of the air supply pipe (340) is located at the upper end of the air supply pipe (340).

6. The factory exhaust ventilation equipment according to claim 5, characterized in that: The upper opening of the air supply pipe (340) is provided with a shielding cover (341).

7. The factory exhaust ventilation equipment according to claim 6, characterized in that: A support frame (620) is provided in the air supply pipe (340), and a telescopic rod (610) is provided on the support frame (620). The movable end of the telescopic rod (610) is fixedly connected to the shielding cover (341). The telescopic rod (610) can drive the shielding cover (341) closer to or away from the upper end opening of the air supply pipe (340) by telescoping.

8. The factory exhaust ventilation equipment according to any one of claims 1 to 7, characterized in that: An air induced hood (350) is provided at the end of the first exhaust duct (310) facing away from the air induced device (200), and the air induced hood (350) has a first opening and a second opening, the opening area of ​​the first opening is smaller than the opening area of ​​the second opening, the first opening is connected to the first exhaust duct (310), and the second opening is connected to the interior of the factory building (100).

9. The factory exhaust ventilation equipment according to any one of claims 1 to 7, characterized in that: The communication position between the first exhaust duct (310) and the factory building (100) is higher than the installation position of the air inducing device (200).

10. The factory exhaust ventilation equipment according to any one of claims 1 to 7, characterized in that: The first exhaust duct (310) is in communication with a side wall of the factory building (100).

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