Flue dust environment simulation device

Abstract

The utility model discloses a flue dust environment simulation device which comprises a heat preservation air supply bin and a heat preservation mixing bin which are communicated with each other, a dust generating device is arranged in the heat preservation air supply bin, the heat preservation mixing bin comprises a steady flow chamber section and a mixing chamber section, and a honeycomb steady flow plate is arranged between the steady flow chamber section and the heat preservation air supply bin. A flow stabilizing net plate is arranged in the flow stabilizing cavity section, a conical dust diffusion barrel is arranged in the heat preservation mixing bin and communicated with a dust generating opening of a dust generating device, the downstream end of the dust diffusion barrel is communicated with the mixing cavity section, a humidifying device is further connected into the mixing cavity section, a heat preservation dust outlet pipe is arranged on the downstream portion of the mixing cavity section, and the heat preservation dust outlet pipe is communicated with the dust generating opening of the dust generating device. The flue dust environment simulation device has the advantages that the flue dust environment can be accurately simulated by the flue dust environment simulation device, and the sampling calibration requirements of dust instruments in the flue dust environment can be met.

Description

Technical Field

[0001] This utility model relates to the field of dust environment simulation technology, and in particular to a flue dust environment simulation device. Background Technology

[0002] In the field of dust environment simulation, conventional dust environments are generally simulated. Dust environment simulation mainly includes horizontal wind tunnel simulation and vertical settling environment simulation. For example, publication number CN221860213U discloses a vertical high-concentration dust environment simulation device, which belongs to the simulation of vertical settling environments; while utility model publication number CN114235322A discloses a horizontal wind tunnel dust environment simulation. However, neither of these two simulation methods can simulate the chimney / flue environment because the chimney / flue environment has the following main characteristics: 1. relatively high temperature; 2. relatively high humidity; 3. relatively high wind speed; these are difficult for current simulation devices to replicate. Simulating the flue dust environment facilitates the calibration of flue dust concentration detection instruments, therefore, the simulation of the flue dust environment is particularly important. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a flue dust environment simulation device that can accurately simulate the flue dust environment, meet the sampling and calibration requirements of dust instruments in the flue dust environment, and solve the problem that the flue dust environment is difficult to simulate in the past.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a flue dust environment simulation device, comprising an insulated air supply chamber and an insulated mixing chamber that are interconnected. The insulated air supply chamber is provided with a circulation return port, and a dust generation device is installed inside the insulated air supply chamber. The insulated mixing chamber includes an upstream stabilizing chamber section and a downstream mixing chamber section. A honeycomb stabilizing plate is installed between the stabilizing chamber section and the insulated air supply chamber. Several stabilizing plates perpendicular to the gas flow direction are installed inside the stabilizing chamber section. The insulated mixing chamber contains a conical dust diffusion cylinder that extends through the flow stabilization chamber section. The upstream end of the dust diffusion cylinder is a small-diameter end that extends into the insulated air supply chamber and connects to the dust emission port of the dust generation device. The downstream end of the dust diffusion cylinder is a large-diameter end that connects to the downstream mixing chamber section of the insulated mixing chamber. A humidification device is also connected to the mixing chamber section. An insulated dust outlet pipe is located downstream of the mixing chamber section, and a horizontal wind tunnel is located downstream of the insulated dust outlet pipe.

[0005] The horizontal wind tunnel, arranged according to the airflow direction, comprises a high-speed anemometer section, a flared mixing section, a first flow equalization section, and a second flow equalization section connected in sequence. The high-speed anemometer section is a constant cross-section section and is fixedly connected to an insulated dust outlet pipe. The high-speed anemometer section is connected to the small-diameter section of the flared mixing section. The high-speed anemometer section is equipped with a window for convenient placement of a calibration high-speed anemometer and a high-speed standard connection port for connecting a standard high-speed anemometer. The large-diameter end of the flared mixing section is connected to the first flow equalization section. The first and second flow equalization sections have the same diameter and a circular cross-section. The top of the second flow equalization section is equipped with a low-speed standard connection port for convenient connection to a standard low-speed anemometer. The bottom of the second flow equalization section is equipped with a first sampling tube installation port and a second sampling tube installation port for convenient installation of dust meter sampling tubes. A temperature and humidity sensor for detecting the internal ambient temperature and humidity is also installed on the side wall of the second flow equalization section. An operation window is also provided on the side wall of the second flow equalization section, and an openable and closable operation chamber door is installed at the operation window.

[0006] Downstream of the second uniform flow section is a first filter device, and downstream of the first filter device is an exhaust fan. The exhaust fan's outlet is connected to an air distribution chamber. The air distribution chamber is equipped with a recirculating air return port and an exhaust port. The recirculating air return port is connected to the recirculating air return port through a recirculating pipe. The recirculating pipe is equipped with an electric heater and an air supply port. Valves are installed on the exhaust port, the recirculating air return port, and the air supply port.

[0007] As a preferred embodiment, the insulated mixing chamber is a rectangular mixing chamber. Each flow-stabilizing mesh plate includes two mesh plate units spliced ​​together. Each mesh plate unit includes a mesh plate frame and a flow-stabilizing perforated mesh filling the mesh plate frame. The mesh plate frame is fixed to the cavity wall of the flow-stabilizing chamber section. A semi-circular groove portion is provided on the vertical rod in the middle of the flow-stabilizing chamber section of the mesh plate frame, which is fitted onto the outside of the dust diffusion cylinder. The two semi-circular groove portions on the spliced ​​perforated mesh units cooperate to form a circular groove portion. The dust diffusion cylinder passes through the circular groove portion and is fixed with a fixing ring. The fixing ring is detachably fixed to the corresponding circular groove portion. Therefore, the insulated mixing chamber is simple to manufacture, and the flow-stabilizing mesh plate is also very convenient to install, and can effectively fix the dust diffusion cylinder.

[0008] As a preferred embodiment, the humidification device includes a steam humidification device and a room temperature water mist humidification device. The outlets of both the steam humidification device and the room temperature water mist humidification device are connected to the mixing chamber section. The steam humidification device includes a steam box fixed outside the mixing chamber section. The steam box contains a heating water pump, an electric heating device, and a gas storage tank. The inlet of the heating water pump is connected to a water supply system, and the outlet of the heating water pump is connected to the inlet of the electric heating device. The outlet of the electric heating device is connected to the inlet of the gas storage tank. The outlet of the gas storage tank is connected to a steam inlet pipe, and the outlet of the steam inlet pipe extends into the mixing chamber section. The room temperature water mist humidification device includes... The inlet flange on the side wall of the insulated mixing chamber is equipped with several atomizing pipe joints. Several atomizing nozzles are fixed at the downstream end of the dust diffusion cylinder. The pipes connecting the atomizing pipe joints and the atomizing nozzles are connected. The inlet flange is connected to a normal temperature water supply system. This humidification device can be selected according to the actual simulation conditions. When using a steam humidification device for heating, high-temperature steam can be added to the mixing chamber section, thus simulating a higher temperature chimney flue environment. When using a normal temperature water mist heating device, the atomization of multiple atomizing nozzles can meet the normal temperature and high humidity flue environment. Furthermore, different humidity requirements can be achieved by opening and closing different numbers of atomizing nozzles.

[0009] As a preferred embodiment, the sidewall of the second flow equalization section is further provided with several side sampling calibration installation ports, each of which can be detachably fitted with a sealing head; the interior of the second flow equalization section is also fixed with an inner support, on which symmetrically arranged mounting blocks for mounting the first and second filter membrane sampling heads are mounted. Therefore, the first and second filter membrane sampling heads can be mounted on the mounting blocks to meet the requirements of filter membrane sampling.

[0010] As a preferred embodiment, the inner support includes a first mounting block and a second mounting block welded inside the second flow equalization section. A fixing cross plate is detachably installed between the first mounting block and the second mounting block. The fixing cross plate is provided with a plurality of horizontally arranged fixing holes. The clamping block is fixed to the fixing cross plate by bolts constrained in the fixing holes therein. The clamping block is provided with a clamping groove for convenient clamping of the first filter membrane sampling head or the second filter membrane sampling head. Therefore, the fixing of the first filter membrane sampling head or the second filter membrane sampling head is very convenient, and the horizontal fixing position can be adjusted by fixing the fixing holes at different positions.

[0011] As a preferred embodiment, the exterior of the high-speed wind measurement section, the flared mixing section, the first flow uniform section, and the second flow uniform section are all wrapped with thermal insulation material.

[0012] As a preferred embodiment, the high-speed wind measurement section includes a rectangular chamber fixed to a frame secured by a U-shaped profile. An insulation board, fitted to the outer surface of the rectangular chamber, is inserted into the U-shaped profile. Connecting ends are provided at both ends of the flared mixing section, the first flow equalization section, and the second flow equalization section. These connecting ends are locked together by latches. The connecting ends are provided with annular grooves for easy insertion of insulation material. This design facilitates the connection between the high-speed wind measurement section and the flared mixing section, the first flow equalization section, and the second flow equalization section, while also simplifying the wrapping of the insulation material.

[0013] As a preferred option, the first filtration device is an electrostatic precipitator. Using an electrostatic precipitator can not only remove dust, but also avoid excessive changes in air resistance after long-term use of the filtration device.

[0014] As a preferred embodiment, the insulated dust outlet pipe is formed by welding several sections with rectangular cross-sections to form a constricted shape. The upstream end of the insulated dust outlet pipe is fixed to the frame of the mixing chamber section. The outside of the insulated dust outlet pipe is wrapped with insulation material, which improves the uniformity of the particles and makes the manufacturing of the insulated dust outlet pipe easier.

[0015] As a preferred embodiment, the exhaust vent is connected to a second filter device.

[0016] After adopting the above technical solution, the effect of this utility model is as follows: Compared with the current vertical environmental simulation device or horizontal wind tunnel environmental simulation, the dust simulation device has the following advantages: 1. The dust generated by the dust generating device is sent into the dust diffusion cylinder and diffuses before entering the mixing chamber section. The exhaust fan provides the aerodynamics for the entire system. The gas in the insulation and gas supply chamber will pass through the honeycomb flow stabilizer plate and flow stabilizer mesh plate to form many fine airflows that also enter the mixing chamber section. In this way, the supplied airflow will be evenly mixed with the dust emitted by the dust diffusion cylinder. Even if the exhaust volume is large, the gas in the insulation and gas supply chamber can be evenly supplied, and there will be no situation of excessive local airflow. Therefore, this simulation device can be suitable for the environment of large-flow chimney flues. 1. The simulation device utilizes gas circulation in the gas distribution chamber. The circulating gas returns to the insulated gas supply chamber through the circulation pipe. During the circulation return, it is heated by an electric heater, thus making full use of thermal energy and reducing heat waste. Furthermore, when the temperature in the entire horizontal wind tunnel reaches the specified temperature, the temperature can be adjusted by controlling the circulation return flow and the exhaust volume of the exhaust port. This avoids the situation of drastic temperature changes caused by directly adjusting the power of the electric heater. 2. The simulation device is equipped with a humidification device, which can humidify the gas in the mixing chamber section to simulate the high humidity environment in the flue. 3. The horizontal wind tunnel of this simulation device can meet the calibration of high-speed or low-speed anemometers, making it more adaptable. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0019] Figure 2 This is a perspective view of another embodiment of the present utility model;

[0020] Figure 3 This is a front view of an embodiment of the present utility model;

[0021] Figure 4 This is a top view of the insulated air-filling chamber, the insulated mixing chamber, and the insulated dust outlet pipe of this utility model embodiment;

[0022] Figure 5 yes Figure 4 Sectional view along AA;

[0023] Figure 6 This is a schematic diagram of the structure of the insulated air replenishment chamber, the insulated mixing chamber, and the insulated dust outlet pipe of this utility model embodiment, with some parts omitted.

[0024] Figure 7 This is a perspective view of the horizontal wind tunnel according to an embodiment of the present invention;

[0025] Figure 8 This is a front view of the horizontal wind tunnel according to an embodiment of the present invention;

[0026] Figure 9 yes Figure 8 Structural cross-sectional view along BB;

[0027] Figure 10 This is a schematic diagram of the internal support structure in an embodiment of this utility model;

[0028] Figure 11 This is a schematic diagram of the internal structure of the steam box in an embodiment of this utility model;

[0029] In the attached diagram: 1. Insulated air supply chamber; 2. Insulated mixing chamber; 21. Flow stabilizing chamber section; 22. Mixing chamber section; 23. Honeycomb flow stabilizing plate; 24. Flow stabilizing mesh plate; 25. Dust diffusion cylinder; 26. Fixing ring; 27. Side sampling calibration installation port; 28. First filter membrane sampling head; 29. ​​Second filter membrane sampling head; 210. First mounting block; 211. Second mounting block; 212. Fixing horizontal plate; 213. Fixing hole; 214. Clip-on block; 3. First filter device; 4. Dust generating device; 5. Insulated dust outlet pipe; 6. Horizontal wind tunnel; 601. High-speed wind measurement section; 602. Flared mixing section; 603. First flow equalization section; 604. Second flow equalization section; 605. High-speed standard connection port; 6 6. Low-speed standard connection port; 607. First sampling tube installation port; 608. Second sampling tube installation port; 609. Temperature and humidity sensor; 610. Operating chamber door; 611. Window door; 612. Connection end; 613. Lock; 614. U-shaped profile; 7. Second filter device; 8. Exhaust fan; 9. Air distribution chamber; 10. Steam humidification device; 101. Steam box; 102. Heating water pump; 103. Electric heating device; 104. Air storage tank; 105. Steam inlet pipe; 11. Room temperature water mist humidification device; 111. Mist inlet flange; 112. Atomizing nozzle; 113. Atomizing pipe connector; 12. Air supply port; 13. Circulation pipe; 14. Electric heater. Detailed Implementation

[0030] The present invention will be further described in detail below through specific embodiments.

[0031] like Figure 1-11 As shown, a flue dust environment simulation device includes an insulated air supply chamber 1 and an insulated mixing chamber 2 that are interconnected. The insulated air supply chamber 1 is equipped with a circulation return port and a dust generation device 4 is installed inside the insulated air supply chamber 1. The insulated mixing chamber 2 includes an upstream stabilizing chamber section 21 and a downstream mixing chamber section 22. A honeycomb stabilizing plate 23 is installed between the stabilizing chamber section 21 and the insulated air supply chamber 1. The stabilizing chamber section 21 is equipped with a plurality of stabilizing mesh plates 24 perpendicular to the gas flow direction. The insulated mixing chamber 2... A conical dust diffusion cylinder 25 is installed inside, which penetrates the flow stabilization chamber section 21. The upstream end of the dust diffusion cylinder 25 is a small-diameter end that extends into the insulated air supply chamber 1 and communicates with the dust generation port of the dust generation device 4. The downstream end of the dust diffusion cylinder 25 is a large-diameter end that communicates with the mixing chamber section 22 downstream of the insulated mixing chamber 2. A humidification device is also connected inside the mixing chamber section 22. An insulated dust outlet pipe 5 is installed downstream of the mixing chamber section 22, and a horizontal wind tunnel 6 is installed downstream of the insulated dust outlet pipe 5.

[0032] The horizontal wind tunnel 6 comprises, in accordance with the airflow direction, a high-speed anemometer section 601, a flared mixing section 602, a first flow equalization section 603, and a second flow equalization section 604 connected sequentially. The high-speed anemometer section 601 is an anemometer section with a constant cross-section and is fixedly connected to the insulated dust outlet pipe 5. The high-speed anemometer section 601 is connected to the small-diameter section of the flared mixing section 602. The high-speed anemometer section 601 is provided with a window 611 for convenient placement of a calibration high-speed anemometer and a high-speed standard connection port 605 for connecting a standard high-speed anemometer. The large-diameter end of the flared mixing section 602 is connected to the first flow equalization section 603. The flow section 603 and the second flow equalization section 604 have the same diameter and a circular cross-section. The top of the second flow equalization section 604 is provided with a low-speed standard connection port 606 for easy connection to a standard low-speed anemometer. The bottom of the second flow equalization section 604 is provided with a first sampling tube installation port 607 and a second sampling tube installation port 608 for easy installation of a dust meter sampling tube. A temperature and humidity sensor 609 for detecting the internal temperature and humidity is also installed on the side wall of the second flow equalization section 604. An operation window is also provided on the side wall of the second flow equalization section 604, and an openable and closable operation chamber door 610 is installed at the operation window.

[0033] Downstream of the second uniform flow section 604 is a first filter device 3, and downstream of the first filter device 3 is an exhaust fan 8. The exhaust fan 8 is connected to an air distribution chamber 9. The air distribution chamber 9 is provided with a recirculation return air port and an exhaust air port. The recirculation return air port is connected to the recirculation return port through a recirculation pipe 13. An electric heater 14 and an air supply port 12 are provided on the recirculation pipe 13. Valves are provided on the exhaust air port, the recirculation return air port, and the air supply port 12.

[0034] In this embodiment, the heat-insulating mixing chamber 2 is a rectangular mixing chamber. Each flow-stabilizing mesh plate 24 includes two mesh plate units spliced ​​together. Each mesh plate unit includes a mesh plate frame and a flow-stabilizing perforated mesh filled in the mesh plate frame. The mesh plate frame is fixed to the cavity wall of the flow-stabilizing chamber section 21. A semi-circular groove portion is provided on the vertical rod in the middle of the flow-stabilizing chamber section 21 on the mesh plate frame, which is sleeved on the outside of the dust diffusion cylinder 25. The two semi-circular groove portions on the spliced ​​perforated mesh units cooperate with each other to form a circular groove portion. The dust diffusion cylinder 25 passes through the circular groove portion and is fixed with a fixing ring 26. The fixing ring 26 is detachably fixed to the corresponding circular groove portion.

[0035] In this embodiment, the humidification device includes a steam humidification device 10 and a room temperature water mist humidification device 11. The outlets of both the steam humidification device 10 and the room temperature water mist humidification device 11 are connected to the mixing chamber section 22. The steam humidification device 10 includes a steam box 101 fixed outside the mixing chamber section 22. The steam box 101 contains a heating water pump 102, an electric heating device 103, and a gas storage tank 104. The inlet of the heating water pump 102 is connected to the water supply system, and the outlet of the heating water pump 102 is connected to the inlet of the electric heating device 103. The outlet of the electric heating device 103... The outlet is connected to the inlet of the gas storage tank 104, and the outlet of the gas storage tank 104 is connected to a steam inlet pipe 105. The outlet of the steam inlet pipe 105 extends into the mixing chamber section 22. The ambient temperature water mist humidification device 11 includes a mist inlet flange 111 installed on the side wall of the insulated mixing chamber 2. The mist inlet flange 111 is provided with a plurality of atomizing pipe joints 113. A plurality of atomizing nozzles 112 are fixed at the downstream end of the dust diffusion cylinder 25. The atomizing pipe joints 113 and the atomizing nozzles 112 are connected by pipes. The mist inlet flange 111 is connected to the ambient temperature water supply system.

[0036] In this embodiment, a plurality of side sampling calibration mounting ports 27 are provided on the side wall of the second flow equalization section 604, and each side sampling calibration mounting port 27 can be detachably installed with a sealing head; an inner support is also fixed inside the second flow equalization section 604, and the inner support is symmetrically provided with mounting blocks 214 for mounting the first filter membrane sampling head 28 and the second filter membrane sampling head 29. The inner support includes a first mounting block 210 and a second mounting block 211 welded inside the second flow equalization section 604. A fixing horizontal plate 212 is detachably installed between the first mounting block 210 and the second mounting block 211. The fixing horizontal plate 212 is provided with a plurality of horizontally arranged fixing holes 213. The mounting blocks 214 are fixed to the fixing horizontal plate 212 by bolts constrained in the fixing holes 213. The mounting blocks 214 are provided with mounting grooves to facilitate the mounting of the first filter membrane sampling head 28 or the second filter membrane sampling head 29.

[0037] The high-speed wind measurement section 601, the flared mixing section 602, the first flow equalization section 603, and the second flow equalization section 604 are all externally wrapped with thermal insulation material. The high-speed wind measurement section 601 includes a rectangular chamber, which is fixed to a frame by a U-shaped profile 614. An insulation board that adheres to the outer surface of the rectangular chamber is fitted inside the U-shaped profile 614. Both ends of the flared mixing section 602, the first flow equalization section 603, and the second flow equalization section 604 are respectively provided with connecting ends 612, which are locked together by a locking buckle 613. The connecting ends 612 are provided with annular grooves for easy insertion of the thermal insulation material.

[0038] In this embodiment, the first filter device 3 is an electrostatic precipitator. The insulated dust outlet pipe 5 is formed by welding several rectangular cross-section variable diameter sections to form a constricted shape. The upstream end of the insulated dust outlet pipe 5 is fixed to the frame of the mixing chamber section 22, and the outside of the insulated dust outlet pipe 5 is wrapped with insulation material. The exhaust port can also be connected to a second filter device 7 according to its own needs.

[0039] During operation, the dust generated by the dust generator 4 is diffused into the dust diffusion cylinder 25 and then enters the mixing chamber section 22. The exhaust fan 8 provides the aerodynamic power for the entire system. The gas in the insulated air supply chamber 1 passes through the honeycomb flow stabilizer plate 23 and the flow stabilizer mesh plate 24, forming numerous fine airflows that also enter the mixing chamber section 22. In this way, the supplied airflow mixes evenly with the dust emitted by the dust diffusion cylinder 25. Even with a large extraction volume, the gas in the insulated air supply chamber 1 can be supplied evenly. Furthermore, the electric heater 14 can heat the supplied gas, raising the temperature inside the insulated air supply chamber 1, which is beneficial for simulating high-temperature environments.

[0040] After passing through the insulated dust outlet pipe 5, the gas enters the horizontal wind tunnel 6. The high-speed anemometer section 601 has the smallest cross-section and the highest wind speed. Connecting a standard high-speed anemometer can be used to test the standard wind speed of this section. When calibrating the high-speed anemometer, simply place the anemometer to be calibrated through the window 611. The top of the second uniform flow section 604 of the horizontal wind tunnel 6 is equipped with a low-speed standard connection port 606 for easy connection to a standard low-speed anemometer. This can be used to detect the actual wind speed of the second uniform flow section 604, providing a wind speed reference for the calibration of dust instruments. Simultaneously, when calibrating the low-speed anemometer, simply open the operating chamber door 610 and place the low-speed anemometer through the operating window. The second uniform flow section 604... The bottom of section 4 is provided with a first sampling tube and a second sampling tube. The side wall of the second flow equalization section 604 is also provided with several side sampling calibration installation ports 27. Each side sampling calibration installation port 27, the first sampling tube installation port 607 and the second sampling tube installation port 608 can be detachably installed with a sealing head. Multiple sampling installation ports can facilitate the calibration of large-sized dust detection devices. Calibration can be performed simply by inserting the sampling tube of the dust detection device into the interior of the second flow equalization section 604. When calibrating small dust instruments, they can also be directly placed into the interior of the horizontal wind tunnel 6. At the same time, the second flow equalization section 604 is provided with a temperature and humidity sensor 609 to record the temperature and humidity data during the current calibration.

[0041] The simulation device also uses the gas distribution chamber 9 for gas circulation. The circulating gas flows back to the heat-insulating gas supply chamber 1 through the circulation pipe 13. During the circulation return, it will be heated by the electric heater 14. This makes full use of thermal energy. When the temperature in the entire horizontal wind tunnel 6 reaches the specified temperature, the temperature can be adjusted by controlling the circulation return flow and the exhaust volume of the exhaust port.

[0042] The pneumatic system, servo motor and other actuators, gear transmission mechanism, and lead screw and nut mechanism mentioned in this embodiment are all current conventional technologies. The 5th edition of the "Mechanical Design Handbook" published in Beijing in April 2008 (5th edition, 28th printing) details the specific structure, principle, and other designs of cylinders, motors, and other transmission mechanisms, which are existing technologies with clear and straightforward structures. The 3rd edition of "Modern Practical Pneumatic Technology" SMC training materials published by Machinery Industry Press on August 1, 2008, details vacuum components, gas circuits, and program control, indicating that the pneumatic structure in this embodiment is also existing technology and clear and straightforward. The book "Motor Drive and Speed ​​Regulation" published by Chemical Industry Press on July 1, 2015, also details motor control and limit switches. Therefore, the circuit and pneumatic connections are clear.

[0043] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and alterations to the technical solution of the present utility model without departing from its design spirit shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A flue dust environment simulation apparatus, characterised in that: The device comprises a heat preservation and air supplement bin and a heat preservation mixing bin which are interconnected, a circulating backflow port is arranged on the heat preservation and air supplement bin, a dust generating device is arranged in the heat preservation and air supplement bin, the heat preservation mixing bin comprises a steady flow chamber section at an upstream and a mixing chamber section at a downstream, a honeycomb steady flow plate is arranged between the steady flow chamber section and the heat preservation and air supplement bin, a plurality of steady flow mesh plates which are perpendicular to the gas flow direction are arranged in the steady flow chamber section, a conical dust diffusion cylinder is arranged in the heat preservation mixing bin, the dust diffusion cylinder penetrates the steady flow chamber section, the upstream end of the dust diffusion cylinder is a small-diameter end and extends into the heat preservation and air supplement bin and communicates with a dust generating port of the dust generating device, the downstream end of the dust diffusion cylinder is a large-diameter end and communicates with the mixing chamber section at the downstream of the heat preservation mixing bin, a humidifying device is further connected in the mixing chamber section, a heat preservation dust outlet pipe is arranged at the downstream of the mixing chamber section, a horizontal wind tunnel is arranged at the downstream of the heat preservation dust outlet pipe, The horizontal wind tunnel comprises a high-speed wind measurement section, an expanding mixing section, a first uniform flow section and a second uniform flow section which are sequentially connected in the gas flow direction, the high-speed wind measurement section is a constant cross-section wind measurement section and is fixedly connected with the heat preservation dust outlet pipe, the high-speed wind measurement section is connected with a small-diameter section of the expanding mixing section, a window door for placing a calibrated high-speed anemometer and a high-speed standard connecting port for connecting a standard high-speed anemometer are arranged on the high-speed wind measurement section, a large-diameter end of the expanding mixing section is connected with the first uniform flow section, the first uniform flow section and the second uniform flow section have the same diameter and the cross-sections thereof are circular, a low-speed standard connecting port for connecting a standard low-speed anemometer is arranged on the top of the second uniform flow section, a first sampling pipe mounting port and a second sampling pipe mounting port for mounting sampling pipes of dust instruments are arranged on the bottom of the second uniform flow section, a temperature and humidity sensor for detecting the internal temperature and humidity is further mounted on the side wall of the second uniform flow section, an operation window is further arranged on the side wall of the second uniform flow section, and a closable operation bin door is mounted at the operation window. A first filtering device is connected at the downstream of the second uniform flow section, an air exhaust fan is connected at the downstream of the first filtering device, an air outlet of the air exhaust fan is connected with an air path distribution chamber, a circulating return air port and an exhaust port are arranged on the air path distribution chamber, the circulating return air port communicates with the circulating backflow port through a circulating pipeline, an electric heater and an air supplement port are arranged on the circulating pipeline, and valves are arranged on the exhaust port, the circulating return air port and the air supplement port.

2. A flue dust environment simulation apparatus as claimed in claim 1, characterised in that: The heat preservation mixing bin is a rectangular mixing bin, each steady flow mesh plate comprises two mesh plate monomers which are spliced with each other, each mesh plate monomer comprises a mesh plate frame and a steady flow mesh which is filled in the mesh plate frame, the mesh plate frame is fixed on the cavity wall of the steady flow chamber section, a semicircular groove part which is sleeved on the outside of the dust diffusion cylinder is arranged on the vertical rod of the mesh plate frame at the middle part of the steady flow chamber section, the two semicircular groove parts on the spliced mesh plate monomers cooperatively form a circular groove part, the dust diffusion cylinder penetrates the circular groove part and is fixed with a fixing ring, and the fixing ring is detachably fixed with the corresponding circular groove part.

3. A flue dust environment simulation apparatus as claimed in claim 2, characterised in that: The humidifying device includes a steam humidifying device and a normal-temperature water mist humidifying device, outlets of the steam humidifying device and the normal-temperature water mist humidifying device are communicated with the mixing chamber section, the steam humidifying device includes a steam tank fixed outside the mixing chamber section, the steam tank is provided with a heating water pump, an electric heating device and a gas storage tank, an inlet of the heating water pump is communicated with a water supply system, an outlet of the heating water pump is communicated with an inlet of the electric heating device, an outlet of the electric heating device is communicated with an inlet of the gas storage tank, a steam inlet pipe is connected to a gas outlet of the gas storage tank, and an outlet of the steam inlet pipe extends into the mixing chamber section; the normal-temperature water mist humidifying device includes a mist inlet flange arranged on a side wall of the heat-insulating mixing bin, a plurality of atomizing pipe joints are arranged on the mist inlet flange, a plurality of atomizing nozzles are fixed to a downstream end of the dust diffusion cylinder, the atomizing pipe joints and the atomizing nozzles are communicated through pipelines, and the mist inlet flange is communicated with a normal-temperature water supply system.

4. A flue dust environment simulation apparatus as claimed in claim 1, wherein: The side wall of the second flow uniformizing section is further provided with a plurality of side sampling calibration installation openings, each of which is detachably installed with a plugging head; the inside of the second flow uniformizing section is further fixed with an inner support, and the inner support is symmetrically provided with clamping blocks for installing first filter membrane sampling heads and second filter membrane sampling heads.

5. A flue dust environment simulation apparatus as claimed in claim 4, characterised in that: The inner support includes first and second installation blocks welded inside the second flow uniformizing section, a fixed horizontal plate is detachably installed between the first and second installation blocks, a plurality of fixed holes are arranged on the fixed horizontal plate in a horizontal row, the clamping blocks are fixed on the fixed horizontal plate through bolts constrained in the fixed holes, and clamping grooves are arranged on the clamping blocks for conveniently clamping the first filter membrane sampling heads or the second filter membrane sampling heads.

6. A flue dust environment simulation apparatus as claimed in claim 5, characterised in that: The outside of the high-speed wind measurement section, the flared mixing section, the first flow uniformizing section and the second flow uniformizing section are wrapped with heat insulation materials.

7. A flue dust environment simulation apparatus as claimed in claim 6, characterised in that: The high-speed wind measurement section includes a rectangular chamber, the rectangular chamber is fixed on a frame fixed by a U-shaped profile, a heat insulation plate is clamped in the U-shaped profile and attached to the outer surface of the rectangular chamber, the flared mixing section, the first flow uniformizing section and the second flow uniformizing section are respectively provided with connecting end heads, the connecting end heads are fixed by lock buckles, and annular clamping grooves are arranged on the connecting end heads for conveniently clamping the heat insulation materials.

8. A flue dust environment simulation apparatus as claimed in claim 1, wherein: The first filter device is an electrostatic precipitator.

9. A flue dust environment simulation apparatus as claimed in claim 1, wherein: The heat-insulating dust outlet pipe is formed in a neck-in shape by welding a plurality of variable-diameter sections with rectangular cross sections, the upstream end of the heat-insulating dust outlet pipe is fixed on the frame of the mixing chamber section, and the outside of the heat-insulating dust outlet pipe is wrapped with heat insulation materials.

10. A flue dust environment simulation apparatus as claimed in claim 1, wherein: The air outlet is connected with a second filter device.

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