A high-temperature furnace and a droplet evaporation test device using the high-temperature furnace

Abstract

The present invention discloses a high-temperature furnace and a droplet evaporation test device using the high-temperature furnace, belonging to the field of droplet evaporation test devices, and specifically relates to a droplet evaporation test device with a high-temperature furnace, which is composed of a high-pressure constant volume bomb, a heating system, a droplet generation system, a gas transmission system, and an image acquisition system; the heating system includes the above-mentioned high-temperature furnace, the gas transmission system includes a gas transmission ring pipe, an auxiliary gas transmission pipe with one end connected to the gas transmission ring pipe, a pump body connected to the gas transmission ring pipe through an inert gas transmission pipe, the other end of the auxiliary gas transmission pipe is connected to the transmission pipe of the liquid drop, a control valve is provided on the auxiliary gas transmission pipe, and a flexible connecting rod perpendicular to its axis is provided at the air outlet end of the auxiliary gas transmission pipe, and an oscillating body is connected to the upper end of the flexible connecting rod through a swinging bar. The present invention is a droplet evaporation test device that can observe the evaporation phenomena of droplets under different moving trajectories and different falling states.

Description

Technical Field

[0001] The present invention belongs to the field of droplet evaporation test devices, and particularly relates to a high-temperature furnace and a droplet evaporation test device using the high-temperature furnace. Background Art

[0002] Spraying is essentially the evaporation of a large number of droplets. Due to the complexity of the spraying process, it is quite difficult to study the atomization and evaporation mechanisms of the entire spray. The characteristics of a single droplet are crucial for analyzing the spraying process. Therefore, it is necessary to study the evaporation characteristics of a single droplet. Currently, there are mainly four experimental research methods for droplet evaporation: the flying droplet method, the suspension method, the attachment method, and the hanging method. The device of the present invention is developed for the hanging method.

[0003] In the hanging method, a droplet is suspended on an ultra-fine thermocouple wire, a quartz wire, a SiC wire, or a ceramic wire, and a moving device is used to quickly place the droplet in a high-temperature and high-pressure environment for evaporation. At the same time, a high-speed camera is used to photograph the droplet evaporation process. The disadvantage of this method is that the fine hanging wire will affect the evaporation of the droplet, and the droplet shape is irregular. However, the significant advantage of this method is that the droplet is stationary, and the entire evaporation, deformation, and fragmentation processes of the droplet can be observed. The temperature of the droplet can also be measured using the thermocouple wire. With the development of research, the requirements for factors such as temperature, pressure, and air flow are getting higher and higher.

[0004] The prior art is as described in Application No. 201810661201.4, with the invention title "A Single Droplet Evaporation Experimental Device". This invention belongs to the field of droplet evaporation technology and particularly relates to a single droplet evaporation experimental device. The device includes a first cavity and a second cavity. The first cavity is arranged directly above the second cavity and is connected through a vertical channel. A droplet generation module is arranged in the first cavity for generating a single droplet and causing the single droplet to drip into the second cavity through the channel under the action of gravity. A quartz hanging wire is arranged in the second cavity, and the quartz hanging wire is arranged below the lower opening of the channel for hanging the single droplet dripping from the first cavity. Since the single droplet drips from the first cavity and there is no need to open the second cavity to send the single droplet into it, the high-pressure environment of the two cavities will not be affected, thus solving the problem of difficulty in generating and hanging a single droplet in a high-pressure environment. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-temperature furnace that can change the moving trajectory of a droplet, achieve different dropping states of the droplet, different air flow changes, changes in the displacement speed of the dripping liquid, reduce the influence of high temperature or high pressure, has good stability and high accuracy, and a droplet evaporation test device using the high-temperature furnace.

[0006] The technical solution adopted by the present invention to achieve the above purpose is as follows:

[0007] A high-temperature furnace, comprising: a furnace body, on which quartz glass windows are provided on two opposite linear surfaces, a thermocouple and a heating wire provided on the furnace body, the thermocouple and the heating wire avoiding the quartz glass windows, the heating wire being connected to an external temperature controller, and the heating power being adjusted by the magnitude of the current.

[0008] Preferably, the furnace body is made of double-layer ceramic material wrapped with 304 stainless steel, the heating wire is arranged in the middle of the double-layer ceramic, and the thermocouple is arranged above the high-temperature furnace.

[0009] Preferably, the thermocouple is a K-type thermocouple, and the diameter of the thermocouple measuring point is 0.5 mm.

[0010] Preferably, the temperature controller is thyristor-controlled, and the current magnitude of the heating wire is adjusted by regulating the conduction angle of the thyristor through PID.

[0011] The present invention discloses a droplet evaporation test device applying the above high-temperature furnace, comprising:

[0012] A high-pressure constant-volume bomb, which includes an upper high-pressure heat capacity bomb and a lower constant-volume bomb, and the high-pressure heat capacity bomb and the lower constant-volume bomb are connected through a ball valve.

[0013] A heating system, which includes the high-temperature furnace of the claim.

[0014] A droplet generation system, which is used to realize the generation and suspension of droplets to the upper part of the suspension wire and send the droplets into the high-pressure heat capacity bomb.

[0015] The device further includes a gas transmission system, which includes a gas transmission ring pipe, an auxiliary gas transmission pipe connected to one end of the gas transmission ring pipe, a pump body connected to the gas transmission ring pipe through an inert gas transmission pipe, the other end of the auxiliary gas transmission pipe is connected to a droplet transmission pipe, the droplet transmission pipe is used to connect the high-pressure heat capacity bomb and the ball valve, a control valve is provided on the auxiliary gas transmission pipe, and a flexible connecting rod perpendicular to its axis is provided at the air outlet port of the auxiliary gas transmission pipe, and the upper end of the flexible connecting rod is connected with a swinging body through a swinging bar.

[0016] An object of the present invention is to study the reaction of droplets in different states in a high-temperature furnace. According to the gas transmission system of the method of the present invention, a trace amount of inert gas can be introduced into the high-temperature furnace to achieve the effect of changing the movement trajectory of the droplets, observe the evaporation process of the moving droplets, and by whether the control valves on the auxiliary gas pipes are opened and closed simultaneously, the movement trajectory of the droplets under turbulent flow can be observed. By adjusting the magnitude of the gas flow, the droplets can be blown into the high-temperature furnace, and under the action of the gas flow, different falling states can be achieved, such as making the droplets fall into the high-temperature furnace in a spiral state, and study the evaporation reaction of droplets in different states in the high-temperature furnace. A swing bar and a swing body are provided in the auxiliary gas transmission pipe of the present invention. The setting of the swing bar and the swing body can reduce the output flow rate of the inert gas in the direction of the air outlet of the auxiliary gas transmission pipe to change the influence caused by the droplet displacement speed. The design of setting a swing bar and a swing body in the auxiliary gas transmission pipe of the present invention can prevent the droplets from entering the interior of the auxiliary gas transmission pipe.

[0017] Preferably, the auxiliary gas transmission pipes are inclined and surround the outside of the droplet transmission pipe. There are at least 3 auxiliary gas transmission pipes, and the air outlets of the auxiliary gas transmission pipes are on the same horizontal plane, and the angles between the auxiliary gas transmission pipes are equal to each other in pairs.

[0018] More preferably, there are 3 auxiliary gas transmission pipes.

[0019] Preferably, the high-pressure constant-volume bomb consists of an upper part and a lower part. The lower constant-volume bomb is used to place the droplet delivery system. The upper and lower constant-volume bombs are independently stamped. After the pressures are the same, the ball valve in the middle is opened to let the droplets enter the high-temperature furnace; the main material of the high-pressure constant-volume bomb has a yield strength of 205 MPa or more when working at 1000°C.

[0020] Preferably, the droplet generation system includes a droplet generation device and a silicon carbide wire for suspending the droplets. The silicon carbide wire is located on the droplet delivery system; the droplet generation device consists of a micro-injection pump and an extremely fine glass tube.

[0021] More preferably, the droplet delivery system further includes a ball screw.

[0022] Preferably, the image acquisition system includes a high-speed camera, an LED backlight, and a computer. A microscopic lens is provided in front of the high-speed camera; the high-speed camera and the LED backlight are correspondingly arranged on a straight line of the quartz glass window.

[0023] Preferably, the main material of the high-pressure constant-volume bomb is 304 stainless steel.

[0024] Preferably, the droplet generation device is arranged inside the housing, which is connected to the hydraulic rod, and the housing is moved by the hydraulic rod. The housing is pushed by the hydraulic rod into the droplet hanging inlet, where the silicon carbide wire on the droplet delivery system hangs the droplets for the droplet evaporation test. The droplet suspension is often arranged inside the droplet hanging inlet, which is usually arranged inside the droplet evaporation test device. However, the high temperature inside the droplet evaporation test device causes the droplets to be affected by the high temperature and the droplet suspension to be unstable. Therefore, in the present invention, the droplet suspension is arranged inside a housing, and the housing is pushed into the droplet hanging inlet by the hydraulic rod to contact and hang with the end part of the droplet delivery system, so as to avoid the droplet suspension scheme being affected by high temperature, high pressure and other conditions for a long time inside the equipment and increasing the complexity of the equipment. In the droplet suspension scheme of the present invention, the extremely fine glass tube is stably connected to the housing through the buffer bracket, so that it can be ensured that the extremely fine glass tube has no vibration, especially the vibration or fracture of the end liquid outlet will not be caused, when the housing is pushed by the external hydraulic rod; secondly, the connection with the extremely fine glass tube is realized through the buffer bracket, the shock pad and the adhesion layer, which realizes the stable connection between the extremely fine glass tube and the housing, avoids the deviation of the levelness of the extremely fine glass tube during the transportation process, etc., and reduces the droplet hanging effect of the droplets; finally, through the buffer bracket, the shock pad, the adhesion layer, the housing, etc., the influence of the high temperature and high pressure environment inside the equipment on the droplet suspension scheme can be reduced again and the complexity of the equipment can be increased.

[0025] Since the present invention adopts a droplet evaporation test device composed of a high-pressure constant-volume bomb, a heating system, a droplet generation system, a gas transmission system, and an image acquisition system, in the droplet generation system, the droplet generation device is arranged inside the housing, the housing is connected to the hydraulic rod, and the housing moves through the hydraulic rod. Therefore, it has the following beneficial effects: Trace amounts of inert gas can be introduced into the high-temperature furnace to achieve the effect of changing the movement trajectory of the droplet, observe the evaporation process of the moving droplet. By whether the control valves on the auxiliary air pipes open and close simultaneously, the movement trajectory of the droplet under turbulent flow can be observed. Through the magnitude of the air flow, the droplet can be blown into the high-temperature furnace, and under the action of the air flow, different falling states can be achieved, such as making the droplet fall into the high-temperature furnace in a spiral state, and studying the evaporation reaction of droplets in different states in the high-temperature furnace. In the auxiliary gas transmission pipe of the present invention, a swing bar and a swing body are provided, and the setting of the swing bar and the swing body can reduce the output flow rate of the inert gas in the direction of the air outlet port of the auxiliary gas transmission pipe to change the influence caused by the droplet displacement speed. The design of setting a swing bar and a swing body in the auxiliary gas transmission pipe of the present invention can prevent the droplet from entering the inside of the auxiliary gas transmission pipe; the ultra-thin glass tube forms a stable connection with the housing through the buffer bracket, so that it can be ensured that when the housing is pushed by the external hydraulic rod, the ultra-thin glass tube has no vibration, especially will not cause vibration or fracture of the liquid outlet at the end; secondly, the connection with the ultra-thin glass tube is realized through the buffer bracket, the shock pad and the adhesion layer, achieving a stable connection between the ultra-thin glass tube and the housing, avoiding the deviation of the levelness during the transportation of the ultra-thin glass tube and reducing the dripping effect of the droplet; finally, through the buffer bracket, the shock pad, the adhesion layer, the housing, etc., the influence of the high-temperature and high-pressure environment inside the equipment on the droplet suspension scheme can be reduced again and the complexity of the equipment can be increased. Therefore, the present invention is a high-temperature furnace that can change the movement trajectory of the droplet, achieve different falling states of the droplet, different air flow changes, changes in droplet displacement speed, reduce the influence of high temperature or high pressure, has good stability and high accuracy, and a droplet evaporation test device using the high-temperature furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the droplet evaporation test device;

[0027] Figure 2 Schematic diagram of the gas transmission system;

[0028] Figure 3 Schematic diagram of the auxiliary gas transmission pipe;

[0029] Figure 4 Schematic diagram of the droplet generation system;

[0030] Figure 5 Schematic diagram of the droplet generation device;

[0031] Figure 6 Schematic diagram of the assembly of the ultra-thin glass tube in the droplet generation device.

[0032] Reference numerals in the drawings:

[0033] 10 is a high-temperature furnace; 20 is an upper high-pressure heat capacity bomb, 21 is the bomb body of the upper high-pressure heat capacity bomb, 22 is a safety valve, 23 is a protective glass, 24 is a microscope lens, 25 is a high-speed camera, 26 is an LED backlight, 27 is a droplet transfer tube, 30 is a gas transmission system, 40 is a silicon carbide wire, 50 is a ball valve, 60 is a droplet delivery system, 70 is a lower constant volume bomb, 71 is a hanging drop inlet;

[0034] 27 is a droplet transfer tube, 30 is a gas transmission system, 31 is a gas transmission ring tube, 32 is an auxiliary gas transmission pipe, 33 is a control valve, 34 is an inert gas transfer pipe, 35 is a pump body;

[0035] 32 is an auxiliary gas transmission pipe, 36 is a flexible connecting rod, 37 is a swinging bar, 38 is a swinging body;

[0036] 71 is a hanging drop inlet, 72 is a housing, 73 is a hydraulic rod, 74 is a hanging drop opening;

[0037] 72 is a housing, 75 is a ball, 76 is an extremely fine glass tube, 77 is a buffer, 78 is a protrusion;

[0038] 771 is an adhesive layer, 772 is a shock pad, 773 is a buffer bracket.

[0039] It should be noted that the drawings are not drawn to scale, and for illustrative purposes, elements of similar structure or function are generally denoted by like reference numerals throughout the drawings. It should also be noted that the drawings are only for facilitating the description of the preferred embodiments and not the invention itself. The drawings do not show every aspect of the described embodiments and do not limit the scope of the invention. Detailed description of the specific embodiments

[0040] The technical solutions of the present invention will be further described in detail below in conjunction with the specific embodiments and the drawings:

[0041] Embodiment 1:

[0042] A high-temperature furnace, the high-temperature furnace is cylindrical. The inner diameter of the cylindrical high-temperature furnace is 80 mm and the height is 250 mm.

[0043] There is a pair of quartz glass observation windows with a diameter of 50 mm in the front and back of the furnace body of the high-temperature furnace. The front window is used to place a high-speed camera, and the back window is for placing an LED backlight. A hole with a diameter of 28 mm is opened below the high-temperature furnace for droplets to enter the high-temperature furnace through and evaporate.

[0044] The entire high-temperature furnace is made of double-layer ceramic material with an outer layer of 304 stainless steel, having good heat insulation performance. A heating wire is wound between the double-layer ceramics. The power of the heating wire is 2KW, and the maximum temperature inside the high-temperature furnace can reach 1000°C. A thermocouple is set above the high-temperature furnace to accurately control the temperature inside the high-temperature furnace. The heating wire is connected to a temperature controller. The temperature controller is of thyristor control type, and the current of the heating wire is adjusted by regulating the conduction angle of the thyristor through PID. In the control of the temperature control system, the target temperature is first set. The ambient temperature inside the bomb is measured in real time by the thermocouple installed inside the high-temperature furnace, and the temperature is fed back to the temperature controller. The temperature controller changes the heating power in real time according to the difference between the real-time temperature and the target temperature, and releases heat through the heating wire installed inside the high-temperature furnace to achieve the purpose of stably controlling the ambient temperature inside the bomb.

[0045] Example 2:

[0046] A droplet evaporation test device,

[0047] The droplet evaporation test device in this embodiment consists of a high-pressure constant volume bomb, a heating system, a droplet generation system, and an image acquisition system.

[0048] The high-pressure constant volume bomb consists of an upper part and a lower part. The lower constant volume bomb is used to place the droplet delivery system, that is, the ball screw. The upper and lower constant volume bombs are independently stamped. After the same pressure, the ball valve in the middle is opened to let the droplets enter the high-temperature furnace. The highest designed temperature of the high-temperature and high-pressure constant volume bomb body is 1000°C, and the highest designed pressure is 5MPa. Therefore, the bomb body needs to have a certain thermal strength, but more importantly, it needs to have sufficient pressure resistance and good sealing performance. Based on the requirements of the bomb body for pressure resistance and heat resistance, the main material of this device is selected as 304 stainless steel. 304 stainless steel has good processing performance, corrosion resistance, and good comprehensive performance. In addition, the melting point of 304 stainless steel is 1398 - 1454°C, it can work for a long time in an environment of 1000°C, and the yield strength is greater than 205MPa, which is suitable for the application requirements of this device. In order to prevent the test droplets from spontaneous combustion during the evaporation process in a high-temperature and high-pressure environment, the gas used to provide the high-pressure environment needs to be an inert gas. Therefore, in this embodiment, a high-pressure nitrogen device with a maximum pressure of 10MPa and a maximum pressure of 1.8MPa after decompression provides a high-pressure inert environment for the constant volume bomb. In order to minimize the air content inside the bomb, before the test, nitrogen needs to flow through the constant volume bomb for about 1 minute to dilute the air inside the bomb as much as possible. During the pressure increase process, the intake pressure is adjusted through a pressure reducing valve, and then the pressure increase of the constant volume bomb is completed. At the same time, it is necessary to pay attention to controlling the pressure difference between the intake pressure and the actual pressure inside the constant volume bomb to prevent the intake from being too fast.

[0049] The heating system includes the high-temperature furnace, temperature controller, heating wire, and thermocouple of Embodiment 1. The high-temperature furnace is cylindrical. The inner diameter of the cylindrical high-temperature furnace is 80 mm, and the height is 250 mm. There is a pair of quartz glass observation windows with a diameter of 50 mm at the front and back of the furnace body of the high-temperature furnace. The front window is used to place a high-speed camera, and the back window is for placing an LED backlight. A hole with a diameter of 28 mm is opened below the high-temperature furnace for droplets to enter the high-temperature furnace and evaporate. The entire high-temperature furnace is made of double-layer ceramic material wrapped with 304 stainless steel, having good heat insulation performance. The heating wire is wound between the double-layer ceramics. The power of the heating wire is 2 KW, and the maximum temperature of 1000 °C can be achieved inside the high-temperature furnace. A thermocouple is set above the high-temperature furnace to accurately control the temperature inside the high-temperature furnace. The heating wire is connected to the temperature controller. The temperature controller is of thyristor control type, and the current of the heating wire is adjusted by regulating the conduction angle of the thyristor through PID regulation. The arrangement of the heating wire inside the high-temperature furnace should be considered to generate a uniform temperature field as much as possible, and at the same time, the heating wire should avoid the quartz glass viewing window to prevent hindering image acquisition. Considering the heat dissipation conditions between the high-temperature furnace and the external environment and the need to reserve a certain margin of heating power, the total heating power is calculated to be approximately 3000 W. The thermocouple sensor selected in the device is a K-type thermocouple, and the diameter of the thermocouple measurement point is 0.5 mm. The temperature controller is selected as thyristor control type, and the current of the heating circuit is controlled by regulating the size of the thyristor conduction angle through PID regulation, thereby adjusting the size of the heating power.

[0050] The data acquisition system includes a high-speed camera, an LED backlight, and a computer. Since the droplets in the experiment are small, a microscopic lens needs to be added in front of the high-speed camera. The frame rate of the high-speed camera is 1000 fps when shooting the evaporation of droplets, and 10000 fps when shooting droplets during droplet combustion.

[0051] In the droplet generation system, a droplet is suspended on a suspension wire and quickly moved to a high-temperature environment. A high-speed camera is used to record the evaporation process of the droplet. The advantage of this technology is that it is easy to operate and can record the evaporation process of the droplet. The disadvantage is that the diameter of the suspended droplet cannot be too small. If the droplet diameter is too small, the influence of the suspension wire on droplet evaporation is relatively large. According to previous studies, when the diameter of the suspension wire is between 0.1 - 0.2 mm and the diameter of the suspended droplet is about 0.6 - 1.3 mm, the influence of the suspension wire on droplet evaporation can be ignored. Commonly used suspension wires mainly include silicon carbide fiber wires, quartz fiber wires, capillary glass tubes, ceramic fibers, and thermocouple wires. In this study, the diameter of the quartz wire used is 0.1 mm and the droplet diameter is about 1 mm. Therefore, the influence of the suspension wire on droplet evaporation can be ignored. A droplet generation device designed to simultaneously suspend multiple droplets, namely a multi-droplet synchronous generator, mainly consists of a micro-injection pump and an extremely fine glass tube. The droplet generation device is arranged inside the housing, and the housing is connected to a hydraulic rod. The housing moves through the hydraulic rod. The housing is pushed by the hydraulic rod into the droplet hanging inlet, where the silicon carbide wire on the droplet delivery system hangs the droplet for the droplet evaporation test. The previous technical solution was to set the droplet hanging scheme inside the droplet inlet. However, since there is a high-temperature situation inside and it is unstable, through design, the droplet hanging scheme is arranged inside a housing, and the housing is pushed into the droplet hanging inlet by the hydraulic rod and hooked with the end part of the screw rod. This avoids the droplet hanging scheme being affected by high temperature, high pressure, etc. for a long time inside the equipment and increases the complexity of the equipment. There can be a sealing measure between the droplet hanging inlet of the lower elastic body and the outside where the housing moves, so that it can be used in a high-pressure environment.

[0052] It should be further described that: inside the housing 72, there is a buffer 77 that abuts against the extremely fine glass tube and can slide relative to it. The specific scheme of this buffer 77 is that it is arranged around the extremely fine glass tube and connected to the inner wall of the housing 72. The specific composition of this buffer is an adhesion layer 771, a shock-absorbing pad 772, and a buffer frame 773 combined in sequence. The buffer 77 composed of the above components can effectively absorb the vibration energy during the displacement of the extremely fine glass tube when it abuts against the extremely fine glass tube during the movement process, reducing the possibility of vibration or end shaking of the extremely fine glass tube.

[0053] The buffers 75 arranged on two opposite sides of the housing 72 can slide relative to the housing 72. Specifically, a protrusion 78 is connected outward at the bottom of the buffer frame 773 of the buffer 77. The protrusion 78 is inserted into the groove opened on the inner wall of the housing 72, and there are balls 75 in the groove. In this way, the buffers 75 arranged on two opposite sides of the housing 72 can move with the extremely fine glass tube when they abut against the extremely fine glass tube, ensuring the smoothness of its movement process.

[0054] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those of ordinary skill in the art can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention shall be defined by the claims.

Claims

1. A droplet evaporation test apparatus with a high temperature furnace, comprising: A high-pressure constant-volume bomb, the high-pressure constant-volume bomb comprising an upper high-pressure heat capacity bomb (20) and a lower constant-volume bomb (70), the high-pressure heat capacity bomb (20) and the lower constant-volume bomb (70) being connected via a ball valve (50). A heating system, wherein the heating system comprises a high temperature furnace (10), A droplet generation system (60) is used to generate droplets and suspend them on the upper part of the suspension wire, and to send the droplets into the high-pressure heat-capacity bomb (20). The invention is characterized in that it also includes a gas delivery system (30), the gas delivery system including a gas delivery ring pipe (31), an auxiliary gas delivery pipe (32) connected to the gas delivery ring pipe (31) at one end, and a pump body (35) connected to the gas delivery ring pipe (31) via an inert gas transmission pipe (34), the other end of the auxiliary gas delivery pipe (32) is connected to a dripping liquid transmission pipe (27), the dripping liquid transmission pipe (27) is used to connect the high-pressure heat capacity bomb (20) and the ball valve (50), the auxiliary gas delivery pipe (32) is provided with a control valve (33), a flexible connecting rod (36) perpendicular to the axis of the auxiliary gas delivery pipe (32) is provided at the gas outlet port of the auxiliary gas delivery pipe (32), the upper end of the flexible connecting rod is connected to a swinging body (38) via a swinging bar (37), A high temperature furnace (10) comprises: a furnace body, quartz glass windows arranged on two opposite sides of the furnace body, a thermocouple and a heating wire arranged on the furnace body, the thermocouple and the heating wire avoiding the quartz glass windows, the heating wire being connected to an external temperature controller, and the heating power being adjusted by the magnitude of the current.

2. The droplet evaporation test device with a high-temperature furnace according to claim 1, characterized in that: The furnace body is made of a double-layer ceramic material covered with 304 stainless steel, the heating wire is arranged in the middle of the double-layer ceramic, and the thermocouple is arranged above the high-temperature furnace.

3. The droplet evaporation test device with a high-temperature furnace according to claim 1, characterized in that: The thermocouple is a K-type thermocouple, and the diameter of the thermocouple measuring point is 0.5 mm.

4. The droplet evaporation test device with a high-temperature furnace according to claim 1, characterized in that: The temperature controller is a thyristor type control, and the current of the heating wire is adjusted by adjusting the thyristor conduction angle through PID.

5. The droplet evaporation test device with a high-temperature furnace according to claim 1, characterized in that: The auxiliary air delivery pipe (32) is inclined and surrounds the outside of the dripping liquid transmission pipe (27), there are at least three auxiliary air delivery pipes (32), the air outlets of the auxiliary air delivery pipes (32) are on the same horizontal plane, and the angles between the auxiliary air delivery pipes (32) are equal.

6. The droplet evaporation test device with a high-temperature furnace according to claim 1, characterized in that: The lower constant volume bomb (70) is used to place the droplet generation system (60); the high-pressure heat capacity bomb (20) and the lower constant volume bomb (70) are stamped independently, and when the pressures are the same, the middle ball valve (50) is opened to allow the droplets to enter the high-temperature furnace; the main material of the high-pressure constant volume bomb has a yield strength of more than 205 MPa when working at 1000°C.

7. The droplet evaporation test device with a high-temperature furnace according to claim 1, characterized in that: The droplet generation system (60) comprises a droplet generation device and a silicon carbide wire (40) for suspending droplets, wherein the silicon carbide wire (40) is located on the droplet generation system; the droplet generation device is composed of a micro-injection pump and an extremely fine glass tube.

8. The droplet evaporation test device with a high-temperature furnace according to claim 1, characterized in that: The test device also includes an image acquisition system, which includes a high-speed camera (25), an LED backlight (26), and a computer. A microscope lens (24) is arranged in front of the high-speed camera (25); the high-speed camera (25) and the LED backlight are respectively arranged on a straight line of the quartz glass window.

9. The droplet evaporation test device with a high-temperature furnace according to claim 6 or 7, characterized in that: The droplet generation system (60) further comprises a ball screw.

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