Intelligent heat recovery air conditioning fresh air machine

Abstract

The present application belongs to the technical field of waste heat recovery and air purification, and discloses an intelligent heat recovery air conditioning fresh air machine. The machine body shell is internally formed with a heat exchange area and a cleaning area separated by a baffle. The flue gas pipeline heat exchange device includes double-row flue gas pipelines in the heat exchange area, spiral fins on the outer wall of the double-row flue gas pipelines, and an air blower. The double-row flue gas pipelines include upper and lower pipelines connected through the cleaning area to form a U-shaped flue. The ash removal device includes an openable access door and a steel brush that can be inserted into the pipeline to remove ash. The fresh air introduction device includes an air blower and a fresh air purification module, which is used to introduce outdoor air after heat exchange and purification into the room. The waste gas purification device and the intelligent constant temperature control device include a PLC controller and a temperature sensor, which are used to automatically adjust the speed of the air blower to maintain a constant temperature according to the indoor temperature. The present application solves the problem of difficult cleaning of ash accumulation in the flue of the existing equipment, and has the functions of efficient heat exchange, convenient maintenance, deep purification, and intelligent control.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery and air purification technology, specifically to an intelligent heat recovery environmental control fresh air system. Background Technology

[0002] Currently, coal-fired, gas-fired, or biomass-fired heating stoves are widely used in livestock and poultry breeding, greenhouse planting, and industrial heating. Their exhaust gases carry a large amount of waste heat (the temperature is usually 200℃-600℃).

[0003] For the waste heat recovery and purification of such exhaust gases, existing technologies mainly fall into two categories: The first is water-based indirect heat exchange technology: This involves using a built-in water storage structure to heat water through flue gas pipes, then transporting the hot water indoors for heat dissipation. This technology suffers from severe thermal inertia, with significant heat loss during water storage and pipeline transport (30%-50%). It also requires additional water pumps and heat sinks, resulting in a complex and slow-responding system. The second approach uses a single-row, straight-through flue pipe for gas-to-gas heat exchange. Existing equipment often uses a straight-through, integrated flue pipe structure. At high temperatures, coal dust and tar in the exhaust gas adhere to the pipe walls, forming a dense layer of ash. Due to the lack of effective cleaning structures and maintenance channels, once the straight-through pipes become blocked, they cannot be cleaned, leading to a sharp decline in heat recovery efficiency after a short period of operation. Furthermore, existing equipment generally lacks effective exhaust gas purification devices, resulting in the direct emission of sulfur dioxide, nitrogen oxides, tar, and particulate matter from the exhaust gas, causing environmental pollution. In addition, most existing equipment uses manual start-stop or gear control, which cannot adjust the heat output in real time according to the indoor temperature, resulting in large fluctuations in indoor temperature. Frequent start-stop also leads to a shortened equipment life and increased energy consumption.

[0004] In summary, existing technologies mainly suffer from low heat recovery efficiency and severe heat loss, clogging by ash and scale and lack of maintenance, poor exhaust gas purification effect, and crude temperature control with high energy consumption in practical applications, thus causing certain energy waste and environmental pollution. Summary of the Invention

[0005] In view of the above problems, the present invention proposes an intelligent heat recovery environmental control fresh air fan that can solve the problem of difficult cleaning of dust accumulation in the flue pipes of existing equipment, while also having the functions of efficient heat exchange, convenient maintenance, deep purification and intelligent control.

[0006] The intelligent heat recovery environmental control fresh air unit according to the present invention includes: a casing, on which a heat source recovery port and an exhaust gas outlet are provided; the interior of the casing forms a heat exchange area and a cleaning area separated by baffles; a flue gas duct heat exchange device, including a double-row flue gas duct disposed in the heat exchange area and spiral fins welded to the outer wall of the flue gas duct, and an induced draft fan disposed at the exhaust gas outlet for extracting exhaust gas; the double-row flue gas duct includes an upper duct and a lower duct; the air inlet of the upper duct is connected to the heat source recovery port; the air outlet of the upper duct is simultaneously connected to the cleaning area and the air inlet of the lower duct; the air inlet of the lower duct is connected to the cleaning area; and the air outlet of the lower duct is connected to the exhaust gas outlet; a dust removal device, including an openable and sealed inspection door disposed on the casing and connected to the cleaning area, and a steel brush; when the inspection door is opened, the steel brush can pass through the air outlet of the upper duct and the air inlet of the lower duct. Mechanical cleaning is performed inside the ductwork; a fresh air introduction device includes a fresh air inlet and a secondary heating heat output port located on the outer casing of the unit, connected to the heat exchange area; a blower located at the fresh air inlet; and a fresh air purification module located at the secondary heating heat output port. The blower drives outdoor fresh air into the heat exchange area to exchange heat with the flue gas duct and spiral fins, and after purification by the fresh air purification module, it is output to the room through the secondary heating heat output port; an exhaust gas purification device is located at the end of the exhaust gas duct to purify the exhaust gas before it is discharged through the exhaust gas outlet; and an intelligent constant temperature control device includes a PLC intelligent controller and a temperature sensor located indoors. The PLC intelligent controller is electrically connected to the blower, exhaust fan, and temperature sensor, and is used to adaptively adjust the blower speed based on the real-time temperature data collected by the temperature sensor to maintain the indoor temperature at a preset constant value.

[0007] Furthermore, the upper and lower pipes are arranged in parallel. The baffle has a first opening that connects to the air outlet of the upper pipe and a second opening that connects to the air inlet of the lower pipe. The first and second openings are connected to the cleaning area, so that the flue gas flows out through the upper pipe under the action of the induced draft fan, enters the cleaning area, and then turns back into the lower pipe.

[0008] Furthermore, the ratio of the total external heat exchange area to the internal cross-sectional area of ​​the flue gas duct is 15:1 to 30:1.

[0009] Furthermore, the exhaust gas purification device includes a filter core layer and a water storage layer; the filter core layer includes, in sequence along the flue gas flow direction, a tar / large particle pre-filtration layer, a coarse dust removal layer, a fine dust removal layer, a desulfurization layer, and an activated carbon adsorption layer; the water storage layer is located downstream of the filter core layer and is used for secondary adsorption of residual harmful substances.

[0010] Furthermore, the tar / large particle pre-filtration layer is made of high-temperature resistant stainless steel wire mesh; the coarse dust removal layer is made of fluoropolymer high-temperature resistant filter bags or glass fiber filter media; the fine dust removal layer is made of PTFE membrane filter media; and the desulfurization layer is made of desulfurization activated carbon layer.

[0011] Furthermore, a stainless steel demister is also installed at the end of the exhaust outlet.

[0012] Furthermore, the maintenance door is sealed to the outer casing of the machine body through a high-temperature resistant sealing strip, and a quick-opening locking device is installed on the maintenance door; the bristle length of the steel brush is matched with the inner diameter of the smoke passage duct.

[0013] Furthermore, the fresh air purification module includes a pre-filter, a photocatalytic purification layer, and a negative ion generator arranged sequentially along the air outlet direction, used to remove ammonia, hydrogen sulfide, volatile organic compounds, and bacteria from the introduced fresh air.

[0014] Furthermore, the blower is a variable frequency speed control blower, and its rated air volume is greater than that of the induced draft fan.

[0015] Furthermore, the PLC intelligent controller has a built-in PID control algorithm, which is used to steplessly adjust the speed of the blower based on the deviation between the real-time temperature fed back by the temperature sensor and the target temperature, so that the indoor temperature fluctuation is controlled within ±1℃; the PLC intelligent controller is also connected to a remote communication module for data interaction with mobile terminals.

[0016] Compared with existing waste heat recovery equipment, the intelligent heat recovery environmental control fresh air system of the present invention has the following advantages: 1) Through the combined design of double-row pipes, independent cleaning area, openable maintenance door 5 and steel brush, the originally closed flue system becomes accessible and cleanable, realizing the thorough removal of ash and scale inside the pipes, enabling the equipment to maintain a high-efficiency heat exchange state for a long time and significantly extending its service life. 2) The heat exchange efficiency was not sacrificed due to the addition of the ash removal function. The flue gas flow in the double-row channel extended the heat exchange path, and the spiral fins enhanced the heat exchange effect, achieving a balance between high-efficiency heat exchange and convenient ash removal. 3) The heat exchange area to the cross-sectional area of ​​the flue gas duct heat exchange device is as high as 15:1 to 30:1, which realizes efficient and direct recovery of waste heat from the exhaust gas, avoids the heat loss of the traditional indirect heat exchange of "flue gas-water-air", and greatly improves the heat utilization rate. 4) After heat exchange, the exhaust gas undergoes deep purification through multi-stage filter core layers (including PM2.5 fine filter layer and desulfurization layer) and water storage layer, and is equipped with stainless steel demister to eliminate white smoke, achieving efficient removal of flue gas pollutants and stably meeting environmental emission standards. 5) The hot air delivered into the room is purified twice by the fresh air purification module (photocatalyst + negative ion), which effectively removes harmful substances such as ammonia, hydrogen sulfide, VOCs and bacteria. It is especially suitable for places with high air quality requirements such as breeding, planting and medical care. 6) It adopts PLC+PID intelligent constant temperature control, which automatically adjusts the blower speed according to the real-time feedback of indoor temperature, and controls the temperature fluctuation within ±1℃ to achieve precise constant temperature; it supports remote communication, and users can remotely monitor and set via mobile phone, improving the convenience and intelligence of use. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A front view schematic diagram of the structure of an intelligent heat recovery environmental control fresh air unit according to an embodiment of the present invention is shown; Figure 2 It shows Figure 1 The diagram shown is a left-side view of the exhaust gas purification device. Figure 3 It shows Figure 1 The diagram shown is a top view of the intelligent heat recovery environmental control fresh air system. Figure 4 It shows Figure 1 The diagram shows the internal structure of the intelligent heat recovery environmental control fresh air system. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] Figure 1 , Figure 3 as well as Figure 4 The structure of an intelligent heat recovery environmental control fresh air unit 100 according to an embodiment of the present invention is shown. (Combined with...) Figure 1 , Figure 3 as well as Figure 4As shown, the intelligent heat recovery environmental control fresh air unit may include: a housing 1, on which a heat source recovery port 11 and an exhaust gas outlet 12 are provided; the housing 1 contains a heat exchange area 101 and a cleaning area 102 separated by a baffle 3; a flue gas duct heat exchange device, including a double-row flue gas duct 2 disposed in the heat exchange area 101 and spiral fins 23 welded to the outer wall of the flue gas duct 2; and an exhaust fan 7 disposed at the exhaust gas outlet duct 121 for drawing in exhaust gas; the double-row flue gas duct 2 includes an upper exhaust duct 2. The upper exhaust pipe 21 is connected to the heat source recovery port 11, and the lower exhaust pipe 22 is connected to the cleaning area 102 and the lower exhaust pipe 22. The lower exhaust pipe 22 is connected to the cleaning area 102, and the lower exhaust pipe 22 is connected to the exhaust pipe 121. The cleaning device includes an openable and sealed inspection door 5 connected to the cleaning area 102 and a steel brush installed on the outer casing 1. When the inspection door 5 is opened, the steel brush can pass through the upper exhaust pipe. The air outlet 212 of duct 21 and the air inlet 221 of the lower exhaust duct 22 enter the duct interior for mechanical cleaning; the fresh air introduction device includes a fresh air inlet 13 and a secondary heating heat outlet 14 connected to the heat exchange area 101 on the outer casing 1, a blower 8 located at the fresh air inlet 13, and a fresh air purification module located at the secondary heating heat outlet 14; the blower 8 is used to drive outdoor fresh air into the heat exchange area to exchange heat with the flue duct 2 and the spiral fins 23, and then pass through the fresh air intake duct. After purification by the air purification module, the air is output to the room through the secondary heating heat output port 14; the exhaust gas purification device 6 is installed at the end of the exhaust gas discharge pipe 121 to purify the exhaust gas before it is discharged through the exhaust gas discharge port 12; and the intelligent constant temperature control device includes a PLC intelligent controller and a temperature sensor installed in the room; the PLC intelligent controller is electrically connected to the blower 8, the induced draft fan 7 and the temperature sensor, and is used to adaptively adjust the speed of the blower 8 according to the real-time temperature data collected by the temperature sensor, so that the indoor temperature is maintained at a preset constant value.

[0020] When the intelligent heat recovery environmental control fresh air unit 100 of the present invention is working, the induced draft fan 7 starts, drawing the high-temperature exhaust gas generated by the heating furnace into the outer casing 1 of the unit through the heat source recovery port 11, and then into the upper exhaust pipe 21. As the exhaust gas flows through the upper exhaust pipe 21, it releases heat into the air within the heat exchange zone 101 through the pipe wall and spiral fins 23. After flowing out from the outlet 212 of the upper exhaust pipe 21, the exhaust gas enters the cleaning zone 102, and under the guidance of the induced draft fan 7 and the baffle 3, it turns back into the inlet 221 of the lower exhaust pipe 22, continuing to release residual heat through the lower exhaust pipe 22, and finally enters the exhaust gas purification device 6 through the exhaust gas discharge pipe 121, where it is purified and discharged through the exhaust gas discharge port 12. Simultaneously, the blower 8 introduces fresh outdoor air into the heat exchange zone 101 through the fresh air inlet 13, where it exchanges heat with the high-temperature flue gas pipe 2 and fins 23, rapidly heating up to form hot air. Hot air is purified by the fresh air purification module at the secondary heating heat output port 14 before being delivered into the room for heating. Simultaneously, an indoor temperature sensor collects temperature data in real time and feeds it back to the PLC intelligent controller. The PLC adaptively adjusts the speed of the blower 8 based on the deviation between the user-set target temperature and the measured temperature, controlling the hot air output to maintain a stable indoor temperature at the set value. After the equipment has been running for a period of time, operators can open the maintenance door 5 and use steel brushes to reciprocate mechanically clean the pipes from the upper exhaust outlet 212 and the lower exhaust inlet 221. The removed ash falls into the cleaning area 102; some can be sucked out by the exhaust fan 7, and the rest can be manually cleaned. After cleaning, the maintenance door is closed to ensure no flue gas leakage.

[0021] The intelligent heat recovery environmental control fresh air unit 100 of this invention innovatively solves the industry pain point of difficult dust removal in existing equipment's straight-through integrated flue pipes. Traditional straight-through integrated flue pipe structures become impossible to clean once dust accumulates, leading to a continuous decline in equipment performance and eventual scrapping. This invention, through a combination of dual-row pipes, an independent cleaning area, an openable inspection door 5, and a steel brush, makes the originally enclosed flue system accessible and cleanable, achieving thorough removal of internal ash and dirt, enabling the equipment to maintain a high-efficiency heat exchange state for a long time and significantly extending its service life. At the same time, the intelligent heat recovery environmental control fresh air unit 100 of this invention does not sacrifice heat exchange efficiency for the added dust removal function. The reversible flow of flue gas in the dual-row channels extends the heat exchange path, and the spiral fins enhance the heat exchange effect, achieving a balance between high-efficiency heat exchange and convenient dust removal. Furthermore, the integrated exhaust gas purification device, fresh air purification module, and intelligent constant temperature control system further improve the equipment's environmental friendliness, health benefits, and intelligence, forming a comprehensive solution that combines energy saving, maintainability, environmental friendliness, and comfort.

[0022] In such Figure 4 In the preferred embodiment shown, to facilitate observation of the internal structure of the outer casing 1, Figure 4The top wall of the outer casing 1 has been removed, allowing the upper exhaust pipe 21 and lower exhaust pipe 22 to be arranged in parallel. The baffle 3 has a first opening connected to the outlet of the upper exhaust pipe 21 and a second opening connected to the inlet of the lower exhaust pipe 22. Both openings are connected to the cleaning area 102, allowing the flue gas, under the action of the induced draft fan 7, to flow out of the upper exhaust pipe 21, enter the cleaning area, and then return into the lower exhaust pipe 22. The opening design on the baffle 3 creates a U-shaped flow path, allowing the flue gas to flow from the upper exhaust pipe 21 into the cleaning area 102 and then back into the lower exhaust pipe 22. This not only extends the residence time of the flue gas in the heat exchange area, improving heat exchange efficiency, but also makes the cleaning area 102 centrally controllable, facilitating dust removal operations. Preferably, the baffle 3 can be made of high-temperature resistant stainless steel to ensure structural stability under high-temperature conditions.

[0023] In a preferred embodiment, the ratio of the total external heat exchange area to the internal cross-sectional area of ​​the flue gas duct 2 can be from 15:1 to 30:1. This arrangement maximizes the heat exchange area while ensuring smooth flue gas flow without increasing resistance, thereby achieving efficient heat exchange.

[0024] Preferably, the flue duct 2 can be made of 304 stainless steel, with a wall thickness of 1.5-3mm, and the fin spacing of the spiral fins 23 can be 5-15mm, with a fin height of 10-25mm. The 304 stainless steel material ensures corrosion resistance and high-temperature strength, and the optimized design of the spiral fin parameters 23 further improves the heat transfer coefficient.

[0025] In such Figure 1 and Figure 2 In the preferred embodiment shown, the exhaust gas purification device 6 may include a filter core layer 61 and a water storage layer 62. The filter core layer 61 may sequentially include a tar / large particle pre-filtration layer, a coarse dust removal layer, a fine dust removal layer, a desulfurization layer, and an activated carbon adsorption layer along the flue gas flow direction. The water storage layer 62 is located downstream of the filter core layer 61 and is used for secondary adsorption of residual harmful substances. This embodiment achieves deep purification of various pollutants such as particulate matter, tar, SO2, and odors in the flue gas through a combination of multi-stage physical filtration, chemical adsorption, and water bath absorption. The water storage layer 62 serves as a last line of defense, adsorbing residual harmful substances and significantly improving the cleanliness of the emitted gas.

[0026] Preferably, the tar / large particle pre-filtration layer can be a high-temperature resistant stainless steel wire mesh; the coarse dust removal layer can be a high-temperature resistant fluoropolymer filter bag or glass fiber filter media; the fine dust removal layer can be a PTFE membrane filter media; and the desulfurization layer can be a desulfurization activated carbon layer. In this embodiment, the stainless steel wire mesh is high-temperature resistant and anti-clogging, suitable for pre-filtration; the fluoropolymer / glass fiber filter media is suitable for medium particle interception; the PTFE membrane filter media can achieve 0.3μm-level fine filtration, effectively removing PM2.5; the desulfurization activated carbon is loaded with alkaline substances, which can efficiently adsorb SO2; and the columnar activated carbon is used to adsorb residual organic matter and odors. The water storage layer adopts an alkaline absorbent bubbling contact method, which can neutralize acidic gases and further improve the desulfurization and denitrification effects.

[0027] Specifically, the aperture of high-temperature resistant stainless steel wire mesh can be 20-40 mesh; the filtration accuracy of high-temperature resistant filter bags or glass fiber filter media can be 10μm.

[0028] In a preferred embodiment, such as Figure 2 As shown, the water storage layer 62 can be a liquid storage tank located downstream of the filter core layer 61, which contains alkaline absorbent liquid. The exhaust gas discharge pipe 121 extends below the surface of the alkaline absorbent liquid to form a bubbling contact. The exhaust gas discharge port 12 is located on the top of the outer shell of the exhaust gas purification device 6.

[0029] In a preferred embodiment, a stainless steel demister may also be installed at the end of the exhaust outlet 12 to remove liquid water mist carried in the flue gas, eliminate the "white smoke" phenomenon, avoid visual pollution and the impact of water mist on the surrounding environment, and improve the environmental image. Preferably, the stainless steel demister may be a baffle plate type or a wire mesh type demister.

[0030] In such Figure 4 In the preferred embodiment shown, the inspection door 5 is sealed to the outer casing 1 via a high-temperature resistant sealing strip, and a quick-opening locking device can be installed on the inspection door 5; the bristle length of the steel brush matches the inner diameter of the flue duct 2. The high-temperature resistant sealing strip ensures no flue gas leakage and guarantees operational safety; the quick-opening locking device allows operators to quickly open and clean the ash; the bristle length of the steel brush matches the inner diameter of the duct, ensuring thorough and complete cleaning without dead angles, and extending the service life of the equipment.

[0031] In a preferred embodiment, the steel brush can be an external, independent component or located inside the inspection door 5. Specifically, it may include: a fixed frame installed inside the inspection door; a rotary drive assembly installed on the fixed frame, including a servo motor and a reducer; a dedicated steel brush, including a central shaft and radially arranged high-temperature resistant steel wire bristles, the central shaft being detachably connected to the output end of the rotary drive assembly; and a linear guide rail installed on the fixed frame, parallel to the axial direction of the smoke duct. The rotary drive assembly can slide along the linear guide rail, allowing the dedicated steel brush to be inserted selectively or simultaneously into the upper or lower duct, and to perform axial reciprocating motion while rotating, achieving a spiral cleaning trajectory. This embodiment, through the combined motion of rotation and axial reciprocating motion, forms a spiral cleaning trajectory within the duct, ensuring no cleaning dead angles along the entire circumference and axial direction of the duct. The detachable connection facilitates replacement of worn brush heads; the selective insertion design adapts to the independent cleaning needs of dual-row ducts, improving the flexibility and thoroughness of the cleaning operation, while also contributing to improved cleaning efficiency.

[0032] In a preferred embodiment, the fresh air purification module (not shown in the figure) may include a pre-filter, a photocatalytic purification layer, and a negative ion generator arranged sequentially along the air outlet direction. These components are used to remove ammonia, hydrogen sulfide, volatile organic compounds, and bacteria from the introduced fresh air. The pre-filter intercepts large particles, the photocatalytic purification layer decomposes harmful gases such as formaldehyde and VOCs, and the negative ion generator has bactericidal and PM2.5 settling effects. This three-layer purification structure ensures that the hot air delivered indoors is clean, safe, and healthy, making it particularly suitable for places with high air quality requirements, such as livestock farms, medical facilities, and schools.

[0033] In a preferred embodiment, the blower 8 may be a variable frequency speed control fan with a rated air volume greater than that of the induced draft fan 7. This arrangement ensures sufficient fresh air intake, maintains a slight positive pressure inside the casing, and prevents backflow of flue gas.

[0034] In a preferred embodiment, the PLC intelligent controller can incorporate a built-in PID control algorithm to steplessly adjust the speed of the blower 8 based on the deviation between the real-time temperature fed back by the temperature sensor and the target temperature, thereby controlling indoor temperature fluctuations within ±1℃. The PLC intelligent controller is also connected to a remote communication module for data interaction with mobile terminals. In this embodiment, the PID control algorithm enables high-precision stepless adjustment of indoor temperature, with fluctuations controlled within ±1℃, significantly improving comfort. The introduction of the remote communication module allows users to remotely monitor and set the temperature via mobile terminals such as smartphones, achieving intelligent and convenient management, and adapting to the needs of modern smart homes and smart agriculture.

[0035] In summary, the workflow of the intelligent heat recovery environmental control fresh air unit 100 in this embodiment of the invention can be divided into four main lines: waste gas treatment and heat exchange path, fresh air heating and delivery path, intelligent control path, and dust removal and maintenance path. First, the waste gas treatment and heat exchange path: the high-temperature waste gas generated by the heating furnace enters the outer casing 1 of the unit through the heat source recovery port 11 and is drawn in by the induced draft fan 7. The waste gas first enters the upper exhaust pipe 21, flows through the heat exchange area of ​​the spiral fins 23, and releases heat into the air in the heat exchange area 101. After the waste gas flows out from the outlet 212 of the upper exhaust pipe 21, it enters the cleaning area 102, and under the guidance of the induced draft fan 7 and the baffle 3, it turns back into the inlet 221 of the lower exhaust pipe 22, and continues to flow through the lower exhaust pipe 22 to release residual heat. After cooling, the exhaust gas enters the exhaust gas purification device 6 through the exhaust gas emission pipe 121. It sequentially passes through a multi-stage filtration process: a tar / large particle pre-filtration layer (filter core layer 61), a coarse dust removal layer, a fine dust removal layer, a desulfurization layer, an activated carbon adsorption layer, and a water bath absorption layer (water storage layer 62). Finally, after water vapor is removed by a stainless steel demister, the exhaust gas is discharged through the exhaust outlet 12, meeting emission standards. Secondly, the fresh air heating and delivery path: the blower 8 introduces fresh outdoor air into the heat exchange area 101 through the fresh air inlet 13. The cold air comes into full contact with the high-temperature flue gas duct 2 and spiral fins 23 within the heat exchange area 101, rapidly heating up to form hot air. Under pressure, the hot air flows to the secondary heating heat output port 14, passing through the primary filter of the fresh air purification module to intercept large particles, the photocatalytic purification layer to decompose harmful gases, and the negative ion generator to sterilize and settle PM2.5 for secondary purification. Finally, clean and safe hot air is delivered into the room for heating. Third, intelligent control path: The indoor temperature sensor monitors the temperature in real time and feeds the data back to the PLC intelligent controller. The PLC controller has a built-in PID control algorithm, which automatically and steplessly adjusts the speed of the blower 8 according to the deviation between the measured temperature and the user-set target temperature, controlling the hot air output to keep the indoor temperature stable within ±1℃ of the set value. The PLC controller can monitor the equipment's operating status and interact with the user's mobile terminal through a remote communication module to achieve remote monitoring, parameter setting, and fault alarm. Fourth, dust removal and maintenance path: After the equipment has been running for a period of time, the operator opens the maintenance door 5 and uses the quick-opening locking device. Using the steel brush bristles on the inside of the maintenance door, which are matched to the inner diameter of the pipe, the brush is inserted into the pipe from the upper pipe outlet 212 and the lower pipe inlet 221 to perform reciprocating mechanical cleaning, thoroughly removing the ash and dirt adhering to the inner wall of the pipe. The removed ash and dirt fall into the cleaning area 102 for manual cleaning. After the dust removal is completed, the maintenance door is closed, and the high-temperature resistant sealing strip ensures no leakage of flue gas, and the equipment resumes normal operation.

[0036] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0037] In the description of this invention, it should be understood that the terms "end", "downstream", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention.

[0038] Furthermore, the terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A smart heat recovery environmental control fresh air system, characterized in that, include: The outer casing (1) is provided with a heat source recovery port (11) and an exhaust port (12). The inner part of the outer casing (1) is formed by a heat exchange area (101) and a cleaning area (102) separated by a baffle (3). The flue gas heat exchange device includes a double-row flue gas pipe (2) disposed in the heat exchange area (101) and a spiral fin (23) welded to the outer wall of the flue gas pipe (2), and an induced draft fan (7) disposed at the exhaust gas discharge pipe (121) for drawing exhaust gas. The double-row flue gas pipe (2) includes an upper pipe (21) and a lower pipe (22). The air inlet of the upper pipe (21) is connected to the heat source recovery port (11). The air outlet (212) of the upper pipe (21) is connected to both the cleaning area (102) and the air inlet (221) of the lower pipe (22). The air inlet (221) of the lower pipe (22) is connected to the cleaning area (102). The air outlet of the lower pipe (22) is connected to the exhaust gas discharge pipe (121). The dust removal device includes an openable and sealed inspection door (5) connected to the cleaning area (102) on the outer shell (1) of the machine body and a steel brush. When the inspection door (5) is opened, the steel brush can enter the pipe through the air outlet (212) of the upper pipe (21) and the air inlet (221) of the lower pipe (22) for mechanical dust removal. The fresh air introduction device includes a fresh air inlet (13) and a secondary heating heat outlet (14) connected to the heat exchange area (101) on the outer shell (1) of the unit body, a blower (8) located at the fresh air inlet (13), and a fresh air purification module located at the secondary heating heat outlet (14); the blower (8) is used to drive outdoor fresh air into the heat exchange area to exchange heat with the flue pipe (2) and the spiral fins (23), and after being purified by the fresh air purification module, it is output to the room through the secondary heating heat outlet (14); An exhaust gas purification device (6) is installed at the end of the exhaust gas discharge pipe (121) to purify the exhaust gas before it is discharged from the exhaust gas discharge port (12); and The intelligent constant temperature control device includes a PLC intelligent controller and a temperature sensor installed indoors; the PLC intelligent controller is electrically connected to the blower (8), the exhaust fan (7) and the temperature sensor, and is used to adaptively adjust the speed of the blower (8) according to the real-time temperature data collected by the temperature sensor, so that the indoor temperature is maintained at a preset constant value.

2. The intelligent heat recovery environmental control fresh air system according to claim 1, characterized in that, The upper exhaust pipe (21) and the lower exhaust pipe (22) are arranged in parallel. The baffle (3) has a first opening that communicates with the air outlet of the upper exhaust pipe (21) and a second opening that communicates with the air inlet of the lower exhaust pipe (22). The first opening and the second opening are simultaneously connected to the cleaning area (102), so that the flue gas flows out through the upper exhaust pipe (21) under the action of the induced draft fan (7), enters the cleaning area, and then turns back into the lower exhaust pipe (22).

3. The intelligent heat recovery environmental control fresh air system according to claim 1 or 2, characterized in that, The ratio of the total heat exchange area outside the flue (2) to the cross-sectional area inside the flue is 15:1 to 30:

1.

4. The intelligent heat recovery environmental control fresh air system according to claim 1 or 2, characterized in that, The exhaust gas purification device (6) includes a filter core layer (61) and a water storage layer (62); the filter core layer (61) includes, in sequence along the flue gas flow direction, a tar / large particle pre-filtration layer, a coarse dust removal layer, a fine dust removal layer, a desulfurization layer and an activated carbon adsorption layer; the water storage layer (62) is located downstream of the filter core layer (61) and is used for secondary adsorption of residual harmful substances.

5. The intelligent heat recovery environmental control fresh air system according to claim 4, characterized in that, The tar / large particle pre-filtration layer is a high-temperature resistant stainless steel wire mesh; the coarse dust removal layer is a fluorinated methyl methacrylate (FMM) high-temperature resistant filter bag or glass fiber filter media; the fine dust removal layer is a PTFE membrane filter media; and the desulfurization layer is a desulfurization activated carbon layer.

6. The intelligent heat recovery environmental control fresh air system according to claim 4, characterized in that, A stainless steel demister is also installed at the end of the exhaust outlet (12).

7. The intelligent heat recovery environmental control fresh air system according to claim 1 or 2, characterized in that, The inspection door (5) is sealed to the outer shell (1) of the machine body by a high-temperature resistant sealing strip. The inspection door (5) is equipped with a quick-opening locking device. The bristle length of the steel brush matches the inner diameter of the smoke passage pipe (2).

8. The intelligent heat recovery environmental control fresh air system according to claim 1 or 2, characterized in that, The fresh air purification module includes a primary filter, a photocatalytic purification layer, and a negative ion generator arranged sequentially along the air outlet direction, used to remove ammonia, hydrogen sulfide, volatile organic compounds, and bacteria from the introduced fresh air.

9. The intelligent heat recovery environmental control fresh air system according to claim 1 or 2, characterized in that, The blower (8) is a variable frequency speed control blower, and its rated air volume is greater than that of the induced draft fan (7).

10. The intelligent heat recovery environmental control fresh air system according to claim 1 or 2, characterized in that, The PLC intelligent controller has a built-in PID control algorithm, which is used to steplessly adjust the speed of the blower (8) based on the deviation between the real-time temperature fed back by the temperature sensor and the target temperature, so that the indoor temperature fluctuation is controlled within ±1℃; the PLC intelligent controller is also connected to a remote communication module for data interaction with a mobile terminal.

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