Cold test device and method for ammonia-coal hybrid fuel turbulent flow

Abstract

The application discloses a cold-state testing device and method for ammonia-coal mixed fuel turbulent flow, wherein, during the testing process, media with different particle sizes are configured into testing media according to a preset mixing ratio of ammonia-coal fuel, the testing media is carried by primary air into a primary air pipe and into a chamber from an outlet end of the primary air pipe, and secondary air enters into an annular space through a cyclone and is mixed with the testing media entering from the primary air pipe. In this way, the actual mixing state of ammonia-coal mixed fuel in a burner is simulated. A laser Doppler wind speed measuring device is mainly used for measuring the average speed of gas phase / solid phase, the average speed of radial / tangential direction, the root mean square speed, the root mean square speed of radial / tangential direction and the average particle size distribution of particles in the burner, so that the turbulent flow characteristics of the ammonia-coal mixed fuel in the burner are obtained, the change rule of the turbulent flow characteristics in the burner is clarified, and the burner is designed and optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ammonia coal combustion test, and particularly relates to a cold state test device and method for turbulent flow of ammonia coal mixed fuel. BACKGROUND

[0002] Ammonia can be directly used as a fuel for coal-fired boilers, and compared with traditional fossil fuels, ammonia can greatly reduce carbon dioxide emissions. Under the national double carbon target, ammonia as a hydrogen carrier is a new type of renewable zero-carbon fuel, and is one of the high-quality alternative fuels for pulverized coal boilers. The low reactivity and high nitrogen content of ammonia molecules lead to the problems of difficult ignition, difficult stable combustion and high NOx emissions. Therefore, ammonia coal co-combustion is one of the effective technical paths for coal-fired boilers to reduce carbon dioxide emissions.

[0003] However, ammonia coal mixed fuel has the problem of combustion stability difficulty. In order to further study the problem of combustion stability difficulty, the study of the turbulent flow characteristics of ammonia coal mixed fuel in the burner is of great significance to the design and optimization of the burner. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent. To this end, the embodiments of the present application propose a cold state test device for turbulent flow of ammonia coal mixed fuel, so as to facilitate the design and optimization of the burner, and the embodiments of the present application propose a cold state test method for turbulent flow of ammonia coal mixed fuel, so as to facilitate the design and optimization of the burner.

[0005] The cold state test device for turbulent flow of ammonia coal mixed fuel according to the embodiments of the present application comprises a support frame, a burner and a laser Doppler wind speed measuring device, the burner is arranged on the support frame, the burner comprises a shell, a cyclone and a primary air pipe, the shell is made of a transparent material, the shell has a cavity, a shell inlet and a shell outlet, the shell inlet and the shell outlet are oppositely arranged and both communicate with the cavity, the outlet end of the cyclone communicates with the shell inlet, the primary air pipe is inserted into the cyclone and the outlet end of the primary air pipe is arranged in the cavity;

[0006] The laser Doppler wind speed measuring device comprises a laser emitting assembly, a first mirror, a second mirror, a receiving lens, a processor and a computer, the first mirror and the second mirror are arranged on two sides of the shell and spaced apart from the laser emitting assembly, the laser emitting assembly can emit first laser and second laser, the light paths of the first laser and the second laser intersect and the intersection point is located in the chamber, the first mirror can receive the first laser and reflect the received first laser to the receiving lens, the second mirror can receive the second laser and reflect the received second laser to the receiving lens, the receiving lens can transmit the received first laser and second laser to the processor, and the processor can process the received first laser and second laser and transmit the processed information to the computer.

[0007] In some embodiments, the combustor further comprises a backflow cap, the backflow cap is located in the chamber and arranged at the outlet end of the primary air pipe.

[0008] In some embodiments, the shell comprises a top plate, a bottom plate and at least three side plates, the at least three side plates are sequentially connected in head-to-tail mode, the top plate and the bottom plate are connected with each side plate, the top plate, the bottom plate and the side plates define the chamber, the shell inlet is arranged on the top plate, the shell outlet is arranged on the bottom plate, and the material of the side plate opposite to the laser emitting assembly is quartz glass.

[0009] In some embodiments, the outlet end of the primary air pipe and the shell outlet are arranged in the axial direction of the primary air pipe, and the ratio of the length of the primary air pipe extending into the chamber to the length of the primary air pipe from the shell outlet is 1.2-1.6.

[0010] In some embodiments, the part of the primary air pipe opposite to the laser emitting assembly is covered with a black coating.

[0011] In some embodiments, the cold-state test device for ammonia-coal mixed fuel turbulent flow of the embodiment of the present application further comprises a primary air pipe, a Roots blower, a feeder, a secondary air pipe and a blower, the outlet of the primary air pipe communicates with the inlet end of the primary air pipe, the feeder communicates with the primary air pipe, the Roots blower is arranged on the primary air pipe, and the Roots blower is used to deliver primary air and test medium in the feeder into the primary air pipe.

[0012] The outlet end of the secondary air pipe communicates with the inlet end of the cyclone, and the blower is arranged on the secondary air pipe, and the blower is used to deliver the secondary air into the cyclone.

[0013] In some embodiments, the cold-state test device for ammonia-coal mixed fuel turbulent flow of the present application further comprises a conveying pipeline, a storage container and an air extractor, the inlet end of the conveying pipeline is in communication with the outlet of the shell, the outlet end of the conveying pipeline is in communication with the storage container, and the air extractor is arranged on the conveying pipeline to convey the tested test medium into the storage container for storage.

[0014] The cold-state test method for ammonia-coal mixed fuel turbulent flow of the present application is based on the cold-state test device for ammonia-coal mixed fuel turbulent flow of any of the above embodiments, which comprises:

[0015] The first medium with a particle size less than 10 μm is used to trace ammonia gas, and the second medium with a particle size less than 10 μm-100 μm is used to trace coal powder;

[0016] The first medium and the second medium are configured into a test medium according to a preset mixing ratio, and the primary air and the test medium are conveyed into the primary air pipeline;

[0017] The cyclone device conveys the secondary air into the chamber;

[0018] The laser Doppler wind speed measuring device measures a plurality of measuring points in the chamber.

[0019] In some embodiments, the plurality of measuring points are divided into a plurality of groups, each group of measuring points comprises a plurality of measuring points, and the plurality of groups of measuring points are arranged at intervals along the axial direction of the primary air pipeline, and the plurality of measuring points in each group of measuring points are arranged at intervals along the radial direction of the primary air pipeline.

[0020] In some embodiments, the plurality of measuring points in each group of measuring points are located on the same side of the primary air pipeline in the radial direction, and the interval distance between adjacent two measuring points increases in turn in the direction away from the primary air pipeline.

[0021] In the process of the cold state test device for the turbulent flow of ammonia coal mixed fuel of the embodiment of the present application, the ammonia coal fuel is mixed according to the preset mixing ratio, and the medium with different particle sizes is configured into the test medium according to the preset mixing ratio of the ammonia coal fuel. The test medium is carried into the primary air pipe by the primary air and enters the chamber from the outlet end of the primary air pipe. The annular space is formed between the outer periphery of the primary air pipe and the shell, and the secondary air enters the annular space through the cyclone to mix with the test medium entering from the primary air pipe. In the above manner, the turbulent flow of the ammonia coal mixed fuel in the actual mixing state in the burner is simulated. The laser Doppler wind speed measuring device is mainly used for measuring the gas phase / solid phase average speed, the radial / tangential average speed, the root mean square speed, the radial / tangential root mean square speed and the average particle size distribution of the particles in the burner. By adjusting the mixing ratio of the ammonia coal mixed fuel, the cyclone intensity of the secondary air and the size of the shell and other working conditions, the turbulent flow characteristics of the ammonia coal mixed fuel in the burner are obtained, the change rule of the turbulent flow characteristics in the burner is clarified, and then the burner is designed and optimized, so as to study the problem of the combustion stability of the ammonia coal mixed fuel. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the structural schematic view of the laser Doppler wind speed measuring device of the cold state test device for the turbulent flow of ammonia coal mixed fuel of the embodiment of the present application.

[0023] Figure 2 is the working schematic view of the laser Doppler wind speed measuring device of the cold state test device for the turbulent flow of ammonia coal mixed fuel of the embodiment of the present application.

[0024] Figure 3 is the distribution schematic view of the measuring point of the cold state test device for the turbulent flow of ammonia coal mixed fuel of the embodiment of the present application in the burner.

[0025] Reference signs:

[0026] Support frame 1

[0027] Burner 2; shell 201; chamber 2011; shell inlet 2012; shell outlet 2013; cyclone 202; primary air pipe 203; backflow cap 204

[0028] Laser Doppler wind speed measuring device 3; laser emitting assembly 301; laser 3011; first laser 30111; second laser 30112; beam splitter 3012; convex lens 3013; first mirror 302; second mirror 303; receiving lens 304; processor 305; computer 306; photomultiplier tube 307

[0029] Primary air pipe 4

[0030] Roots blower 5

[0031] Feeder 6;

[0032] Secondary air duct 7;

[0033] Blower 8;

[0034] Pipeline 9;

[0035] Storage container 10;

[0036] Exhaust fan 11;

[0037] Measurement point 12. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0040] like Figures 1 to 3 As shown, the cold-state test apparatus for turbulent flow of ammonia-coal mixed fuel according to an embodiment of the present invention includes a support frame 1, a burner 2, and a laser Doppler anemometer 3. The burner 2 is mounted on the support frame 1 and includes a shell 201, a cyclone separator 202, and a primary air duct 203. The shell 201 is made of transparent material and has a chamber 2011, a shell inlet 2012, and a shell outlet 2013. The shell inlet 2012 and the shell outlet 2013 are arranged opposite to each other and are both connected to the chamber 2011. The cyclone separator 202 is located at the shell outlet 2013 and its outlet end is connected to the shell inlet 2012. The primary air duct 203 is inserted into the cyclone separator 202 and its outlet end is placed inside the chamber 2011.

[0041] The laser Doppler wind speed measuring device 3 comprises a laser emitting assembly 301, a first mirror 302, a second mirror 303, a receiving lens 304, a processor 305 and a computer 306. The first mirror 302 and the second mirror 303 are arranged on two sides of the casing 201 and spaced apart from the laser emitting assembly 301. The laser emitting assembly 301 can emit a first laser 30111 and a second laser 30112. The light paths of the first laser 30111 and the second laser 30112 intersect and the intersection point is located in the chamber 2011. The first mirror 302 can receive the first laser 30111 and reflect the received first laser 30111 to the receiving lens 304. The second mirror 303 can receive the second laser 30112 and reflect the received second laser 30112 to the receiving lens 304. The receiving lens 304 can transmit the received first laser 30111 and second laser 30112 to the processor 305. The processor 305 can process the received first laser 30111 and second laser 30112 and transmit the processed information to the computer 306.

[0042] It should be noted that the casing 201 is made of transparent material. The purpose is that the first laser 30111 and the second laser 30112 emitted by the laser emitting assembly 301 can pass through the casing 201 and be reflected to the receiving lens 304 by the first mirror 302 and the second mirror 303. Since the coal powder is a black medium, in order to prevent the coal powder from adhering to the inner wall of the casing 201 and affecting the passage of the first laser 30111 and the second laser 30112 through the casing 201, different particle sizes of white test medium are used to trace the ammonia gas and the coal powder during the test. For example, those skilled in the art can understand that glass beads with a particle size less than 10 μm are used to trace the ammonia gas, and glass beads with a particle size of 10 μm-100 μm are used to trace the coal powder.

[0043] During the cold test of the ammonia-coal mixed fuel turbulent flow test device, the ammonia-coal fuel is mixed according to the predetermined mixing ratio, and the glass beads with different particle sizes are configured into the test medium according to the predetermined mixing ratio of the ammonia-coal fuel. The test medium is carried into the primary air pipe 203 by the primary air and enters the chamber 2011 from the outlet end of the primary air pipe 203. An annular space is formed between the outer periphery of the primary air pipe 203 and the casing 201. The secondary air enters the annular space through the cyclone 202 and mixes with the test medium entering the primary air pipe 203. In this way, the actual mixing state of the ammonia-coal mixed fuel in the burner 2 is simulated.

[0044] As Figure 2As shown, the intersection of the light paths of the first laser 30111 and the second laser 30112 emitted by the laser emitting assembly 301 is located in the chamber 2011, and it is to be noted that the intersection of the first laser 30111 and the second laser 30112 in the chamber 2011 is the measurement point 12. The first laser 30111 and the second laser 30112 pass through the shell 201, are reflected by the first mirror 302 and the second mirror 303 to the receiving lens 304, the receiving lens 304 transmits the received first laser 30111 and second laser 30112 to the processor 305 for processing after amplification by the photomultiplier tube 307, and the information processed by the processor 305 is transmitted to the computer 306 for display of the measurement result.

[0045] The laser Doppler wind speed measuring device 3 is mainly used for measuring the gas phase / solid phase average speed, the radial / tangential average speed, the root mean square speed, the radial / tangential root mean square speed and the particle average particle size distribution in the burner 2, and by adjusting the mixing ratio of the ammonia coal mixed fuel, the rotational flow intensity of the secondary air and the size of the shell 201 and various working conditions, the turbulent flow characteristics of the ammonia coal mixed fuel in the burner 2 are obtained, the change rule of the turbulent flow characteristics in the burner 2 is clarified, and then the burner 2 is designed and optimized, so as to study the problem of the stability of the ammonia coal mixed fuel combustion.

[0046] Therefore, the cold state test device for the turbulent flow of the ammonia coal mixed fuel of the embodiment of the present application can obtain the turbulent flow characteristics of the ammonia coal mixed fuel in the burner 2, so as to design and optimize the burner 2.

[0047] Optionally, as shown in Figure 2 As shown, the laser emitting assembly 301 comprises a laser 3011, a beam splitter 3012 and a convex lens 3013, one laser emitted by the laser 3011 can enter the beam splitter 3012, the beam splitter 3012 can divide the received one laser into parallel first laser 30111 and second laser 30112, the first laser 30111 and the second laser 30112 can enter the convex lens 3013, and the first laser 30111 and the second laser 30112 intersect after refraction by the convex lens 3013.

[0048] In some embodiments, the burner 2 further comprises a backflow cap 204, and the backflow cap 204 is located in the chamber 2011 and arranged at the outlet end of the primary air pipe 203.

[0049] For example, as shown in Figure 2 and Figure 3As shown, primary air carrying the test medium reaches the return cap 204 from the outlet end of the primary air duct 203, and is ejected in reverse through the return channel formed between the outer wall of the primary air duct 203 and the return cap 204. The ejected primary air and test medium mix with the secondary air entering the chamber 2011 from the cyclone separator 202. Thus, by setting the return cap 204, it can also be used to simulate the turbulence when ammonia-coal mixed fuel enters the burner 2 in a reverse direct flow, making the cold-state test device for turbulent flow of ammonia-coal mixed fuel of this embodiment of the invention more versatile.

[0050] In some embodiments, the housing 201 includes a top plate, a bottom plate, and at least three side plates connected end to end. The top plate and the bottom plate are connected to each side plate. The top plate, the bottom plate, and the at least three side plates define a chamber 2011. The housing inlet 2012 is located on the top plate, and the housing outlet 2013 is located on the bottom plate. The side plate facing the laser 3011 is made of quartz.

[0051] For example, such as Figures 1 to 3 As shown, the housing 201 is a cube, comprising four side plates. These four side plates are sequentially and sealed together end-to-end. The top plate is sealed to the top of the four side plates, and the bottom plate is sealed to the bottom of the four side plates. The side plate facing the laser 3011 is made of quartz, while the other three side plates are made of plexiglass. This effectively reduces the adhesion of glass microspheres to the walls, ensuring the light transmittance of the housing 201 and preventing interference with the entry of the first laser 30111 and the second laser 30112 into the housing 201, thus affecting the accuracy of the experimental results. It should be noted that the side plates of the housing 201 must be cleaned before each experiment to reduce experimental system errors.

[0052] Of course, in other embodiments, the housing 2 can also be a cylindrical body.

[0053] In some embodiments, the outlet end of the primary air duct 203 and the housing outlet 2013 are arranged axially spaced apart in the primary air duct 203, and the ratio of the length of the primary air duct 203 extending into the chamber 2011 to the length of the primary air duct 203 from the housing outlet 2013 is 1.2-1.6.

[0054] Specifically, such as Figure 3 As shown, the height of the housing 201 is 655mm. The housing inlet 2012 and the housing outlet 2013 are arranged opposite each other in the vertical direction. The housing outlet 2013 is located directly below the outlet end of the primary air duct 203. The length of the primary air duct 203 extending into the chamber 2011 is 385mm. The distance from the outlet end of the primary air duct 203 to the housing outlet 2013 is 270mm. The ratio of 385mm to 270mm is 1.426.

[0055] Therefore, the ratio of the length of the primary air pipe 203 extending into the chamber 2011 to the length of the primary air pipe 203 away from the shell outlet 2013 can be reasonably set during the test, so that the influence of the shell outlet 2013 on the flow field in the burner 2 can be ignored, and the accuracy of the test results is further ensured.

[0056] In some embodiments, the part of the primary air pipe 203 facing the laser 3011 is covered with a black coating.

[0057] It can be understood that, due to the particularity of the primary air pipe 203, coating the surface of the primary air pipe 203 facing the laser 3011 with black can eliminate the influence of metal on the laser, thereby further facilitating the improvement of the test accuracy of the cold-state test device for ammonia-coal mixed fuel turbulent flow of the embodiments of the present application.

[0058] In some embodiments, the cold-state test device for ammonia-coal mixed fuel turbulent flow of the embodiments of the present application further comprises a primary air pipe 4, a Roots blower 5, a feeder 6, a secondary air pipe 7 and a blower 8. The outlet of the primary air pipe 4 is in communication with the inlet end of the primary air pipe 203, the feeder 6 is in communication with the primary air pipe 4, and the Roots blower 5 is arranged on the primary air pipe 4. The Roots blower 5 is used to deliver the primary air and the test medium in the feeder 6 into the primary air pipe 203. The secondary air pipe 7 is in communication with the inlet end of the cyclone 202, and the blower 8 is arranged on the secondary air pipe 7. The blower 8 is used to deliver the secondary air into the cyclone 202.

[0059] As shown in Figure 1 , in use, the cold-state test device for ammonia-coal mixed fuel turbulent flow of the embodiments of the present application is in communication with a wind box (not shown in the figure) through the air inlet of the primary air pipe 4 and the air inlet of the secondary air pipe 7, and then the test medium is placed in the feeder 6. The Roots blower 5 delivers the primary air and the test medium into the primary air pipe 203. The blower 8 delivers the secondary air into the cyclone 202. By adjusting the cyclone intensity of the cyclone 202, the cyclone 202 delivers the secondary air into the annular space between the primary air pipe 203 and the shell 201.

[0060] Therefore, by arranging the primary air pipe 4, the Roots blower 5 and the feeder 6, it is convenient to deliver the primary air and the test medium into the primary air pipe 203. By arranging the secondary air pipe 7 and the blower 8, it is convenient to deliver the secondary air into the burner 2.

[0061] In some embodiments, the cold-state test device for ammonia-coal mixed fuel turbulent flow of the present embodiment further comprises a conveying pipeline 9, a storage container 10 and an air extractor 11, the inlet end of the conveying pipeline 9 is communicated with the shell outlet 2013, the outlet end of the conveying pipeline 9 is communicated with the storage container 10, and the air extractor 11 is arranged on the conveying pipeline 9 so as to convey the tested test medium into the storage container 10.

[0062] For example, as shown in Figure 1 the test medium in the burner 2 is discharged through the shell outlet 2013 and enters the conveying pipeline 9 under the action of the air extractor 11, and finally enters the storage container 10, so as to store the tested test medium and prevent the test medium from polluting the environment, so that the cold-state test device for ammonia-coal mixed fuel turbulent flow of the present embodiment is better in environmental protection.

[0063] The cold-state test method for ammonia-coal mixed fuel turbulent flow of the present embodiment is based on the cold-state test device for ammonia-coal mixed fuel turbulent flow in any of the above embodiments, and comprises:

[0064] The first medium with a particle size less than 10 μm is used to trace ammonia, and the second medium with a particle size less than 10 μm-100 μm is used to trace coal powder;

[0065] The first medium and the second medium are configured into a test medium according to a preset mixing ratio, and the primary air and the test medium are conveyed into the primary air pipeline 203;

[0066] The cyclone 202 conveys the secondary air into the chamber 2011;

[0067] The laser Doppler wind speed measuring device 3 measures a plurality of measurement points in the chamber 2011.

[0068] For example, the first medium and the second medium can both be glass beads, which are white, and different particle sizes of glass beads are used to trace ammonia and coal powder, so that the shell 2 will not reduce the transparency of the inner wall of the shell 201 due to long-term testing, so as to prevent the first laser 30111 and the second laser 30112 from entering the shell 2, thereby affecting the test accuracy.

[0069] In some embodiments, the plurality of measurement points 12 are divided into a plurality of groups, the plurality of groups of measurement points 12 are arranged along the axial direction of the primary air pipeline 203, each group of measurement points 12 comprises a plurality of measurement points 12, and the plurality of measurement points 12 in each group of measurement points 12 are arranged along the radial direction of the primary air pipeline 203.

[0070] For example, as shown in Figure 3As shown, the gas-solid two-phase flow characteristics within the axial and radial ranges of the primary air duct 203 were measured. During the experiment, each measurement point was sampled 5000 times. This yielded the turbulent characteristics of the ammonia-coal mixed fuel within the axial and radial ranges of the primary air duct 203 in the burner 2. This information is helpful in accurately elucidating the variation law of turbulent flow characteristics in the burner 2, thereby facilitating the design and optimization of the burner 2.

[0071] In some embodiments, such as Figure 3 As shown, multiple measurement points 12 in each group of measurement points 12 are located on the same side of the primary air duct 203 in its radial direction, and the distance between two adjacent measurement points 12 increases sequentially in the direction away from the primary air duct 203.

[0072] For example, such as Figure 3 As shown, each group of measurement points 12 includes seven measurement points 12, which are located on one side of the primary air duct 203 in its radial direction. The seven measurement points 12 are arranged from dense to sparse in a direction away from the primary air duct 203.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0077] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. In the present specification, illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0078] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of protection of the present application.

Claims

1. A cold state test device for turbulent flow of ammonia-coal mixed fuel, characterized by, The utility model relates to a kind of combustion device, including: Support frame (1); Combustor (2), the combustor (2) is located on the support frame (1), the combustor (2) includes shell (201), swirler (202) and primary air pipe (203), the shell (201) is made of transparent material, the shell (201) has chamber (2011), shell inlet (2012) and shell outlet (2013), the shell inlet (2012) and the shell outlet (2013) are oppositely arranged and are all communicated with the chamber (2011), the outlet end of the swirler (202) is communicated with the shell inlet (2012), the primary air pipe (203) is inserted in the swirler (202) and the outlet end of the primary air pipe (203) is placed in the chamber (2011);And Laser Doppler wind speed measuring device (3), the laser Doppler wind speed measuring device (3) includes laser emission assembly (301), first mirror (302), second mirror (303), receiving lens (304), processor (305) and computer (306), the first mirror (302) and second mirror (303) are spaced apart with the laser emission assembly (301) and are located on both sides of the shell (201), the laser emission assembly (301) can emit first laser (30111) and second laser (30112), the light path of the first laser (30111) and second laser (30112) intersects and intersection point is located in the chamber (2011), the first mirror (302) can receive the first laser (30111) and reflect the first laser (30111) received to the receiving lens (304), the second mirror (303) can receive the second laser (30112) and reflect the second laser (30112) received to the receiving lens (304), the receiving lens (304) can transmit the first laser (30111) and the second laser (30112) received to the processor (305), the processor (305) can process the first laser (30111) and the second laser (30112) received and transmit the information processed to the computer (306); The laser Doppler wind speed measuring device (3) is used for measuring the gas phase / solid phase average speed, root mean square speed and particle average particle size distribution in the combustor (2), by adjusting ammonia coal mixed fuel blending ratio, secondary air swirl intensity and shell (201) size, so that the turbulent flow characteristics of ammonia coal mixed fuel in combustor (2) are obtained.

2. The cold state test device for ammonia-coal hybrid fuel turbulent flow according to claim 1, characterized in that, The combustor (2) further includes backflow cap (204), and the backflow cap (204) is located in the chamber (2011) and is arranged at the outlet end of the primary air pipe (203).

3. The cold flow test apparatus for ammonia-coal hybrid fuel turbulent flow according to claim 1, wherein The shell (201) comprises a top plate, a bottom plate and at least three side plates connected in sequence, the top plate and the bottom plate are connected with each side plate, the top plate, the bottom plate and the side plates define the chamber (2011), the shell inlet (2012) is arranged on the top plate, the shell outlet (2013) is arranged on the bottom plate, and the material of the side plate opposite to the laser emitting assembly (301) is quartz glass.

4. The cold flow test apparatus for ammonia-coal hybrid fuel turbulent flow according to claim 1, wherein The outlet end of the primary air pipe (203) is arranged in the axial direction of the primary air pipe (203) and spaced from the shell outlet (2013), and the length of the primary air pipe (203) extending into the chamber (2011) is 1.2-1.6 times the length of the primary air pipe (203) from the shell outlet (2013).

5. The cold flow test apparatus for ammonia-coal hybrid fuel turbulent flow according to claim 1, wherein The part of the primary air pipe (203) opposite to the laser emitting assembly (301) is covered with a black coating.

6. The cold flow test apparatus for ammonia-coal hybrid fuel turbulent flow according to claim 1, wherein Further comprising: A primary air pipe (4), a Roots blower (5) and a feeder (6), the outlet of the primary air pipe (4) is communicated with the inlet end of the primary air pipe (203), the feeder (6) is communicated with the primary air pipe (4), the Roots blower (5) is arranged on the primary air pipe (4), and the Roots blower (5) is used for conveying primary air and test medium in the feeder (6) into the primary air pipe (203); and A secondary air pipe (7) and a blower (8), the outlet end of the secondary air pipe (7) is communicated with the inlet end of the cyclone (202), and the blower (8) is arranged on the secondary air pipe (7), and the blower (8) is used for conveying the secondary air into the cyclone (202).

7. The cold state test device for ammonia-coal hybrid fuel turbulent flow according to claim 6, characterized in that, Further comprising a conveying pipe (9), a storage container (10) and an exhaust fan (11), the inlet end of the conveying pipe (9) is communicated with the shell outlet (2013), the outlet end of the conveying pipe (9) is communicated with the storage container (10), and the exhaust fan (11) is arranged on the conveying pipe (9) to convey the tested test medium into the storage container (10) for storage.

8. A cold state test method for turbulent flow of ammonia-coal mixed fuel, characterized by, The method is based on the cold test device for ammonia-coal mixed fuel turbulent flow in any one of claims 1-7, comprising: A first medium with a particle size less than 10 μm is used to trace ammonia, and a second medium with a particle size of 10 μm-100 μm is used to trace coal powder; The first medium and the second medium are configured into test medium according to a preset mixing ratio, and primary air and the test medium are conveyed into the primary air pipe (203); The cyclone (202) conveys secondary air into the chamber (2011); The laser Doppler wind speed measuring device (3) measures a plurality of measurement points (12) in the chamber (2011).

9. The cold state test method for ammonia-coal hybrid fuel turbulent flow according to claim 8, wherein, The multiple measurement points (12) are divided into multiple groups, each group of the measurement points (12) comprising multiple measurement points (12), and the multiple groups of the measurement points (12) are arranged at intervals along the axial direction of the primary air pipe (203), and the multiple measurement points (12) in each group of the measurement points (12) are arranged at intervals along the radial direction of the primary air pipe (203).

10. The cold state test method for ammonia-coal hybrid fuel turbulent flow according to claim 9, wherein, The multiple measurement points (12) in each group of the measurement points (12) are located on the same side of the primary air pipe (203) in the radial direction, and the interval distance between adjacent two measurement points (12) gradually increases in the direction away from the primary air pipe (203).

Images