Laboratory small size cyclone coal burner

Abstract

The application provides a laboratory small-size cyclone coal powder burner, which comprises a central coal powder conveying pipe, a ring one conveying structure, a ring two conveying structure, a ring three conveying structure and a ring four conveying structure. The ring one conveying structure is sleeved outside the central coal powder conveying pipe and surrounds the central coal powder conveying pipe to form a ring one channel for gas flow. The ring two conveying structure is sleeved outside the ring one conveying structure and surrounds the ring one conveying structure to form a ring two channel for gas flow. The ring three conveying structure is sleeved outside the ring two conveying structure and surrounds the ring two conveying structure to form a ring three channel for gas flow. The ring four conveying structure is sleeved outside the ring three conveying structure and surrounds the ring three conveying structure to form a ring four channel for gas flow. Through adjustment and combination of various coal powder concentrations and air distribution, combustion modes under different types of cyclone coal powder burners and different loads can be constructed, and combustion characteristics and design optimization of actual power station boiler cyclone burners can be studied according to experimental measurement results.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of combustion equipment, in particular to a laboratory small-size swirl coal burner. BACKGROUND

[0002] In the power industry and other industries in China, the coal powder combustion method accounts for a significant proportion. For coal-fired power plant boilers, the proportion of 300MW and above load coal-fired units using swirl coal burners is as high as more than 40%, and there are many technical schools. For different types of swirl coal burners, the ignition, combustion stability, nitrogen oxide generation characteristics, low load stable combustion capability, and load rate of coal powder have always been the core issues of swirl coal combustion research. However, due to the large size and complex structure of the actual power plant boiler swirl coal burner, it is difficult to systematically and comprehensively measure the multi-field data reflecting the coal combustion characteristics during the actual operation of the burner, which greatly restricts the in-depth study and performance improvement of the swirl coal burner combustion characteristics. Therefore, it is urgent to develop a more flexible and practical swirl coal burner research method.

[0003] Numerical calculation and laboratory measurement are the main methods for studying swirl coal burners. At present, numerical calculation can obtain calculation results close to real combustion conditions, but it is still difficult to obtain quantitative results, and it is difficult to reflect the flame stability of actual combustion. Laboratory experimental measurement can be divided into cold-state experiment and hot-state experiment. Cold-state experiment measurement cannot reflect the complex flow and mass and heat transfer process in actual coal combustion, and there is a big difference from actual combustion. Laboratory hot-state experiment is limited by indoor space and cost, and the design size of the burner is much smaller than that of the actual swirl coal burner. It is often difficult to reproduce the complex structure of the actual burner on the experimental burner, that is, it is difficult to achieve multi-layer air distribution, coal concentration, and the installation of adjustable blades for adjusting the swirl intensity. Therefore, there is a big difference between the actual swirl coal burner structure and the combustion method, and the experimental measurement results are difficult to reflect the combustion characteristics of the actual power plant boiler swirl coal burner and guide the design optimization of the burner. SUMMARY

[0004] Therefore, it is necessary to provide a laboratory small-size swirl coal burner capable of constructing the combustion method of different types of swirl coal burners and different loads, in view of the problem that the experimental measurement results of the current experimental burner are difficult to reflect the combustion characteristics of the actual power plant boiler swirl coal burner and guide the optimization design of the burner.

[0005] The above-mentioned purpose is achieved by the following technical solutions:

[0006] A laboratory small-size swirl coal burner, comprising:

[0007] a central pulverized coal conveying pipe having a central passage for conveying a pulverized coal gas stream and an inlet end and an outlet end located at both ends of the central passage;

[0008] a first annular conveying structure sleeved outside the central pulverized coal conveying pipe and surrounding the central pulverized coal conveying pipe to form a first annular passage for the gas stream, the first annular conveying structure being capable of adjusting the rotational flow intensity of the gas stream;

[0009] a second annular conveying structure sleeved outside the first annular conveying structure and surrounding the first annular conveying structure to form a second annular passage for the gas stream, the second annular conveying structure being capable of adjusting the rotational flow intensity of the gas stream;

[0010] a third annular conveying structure sleeved outside the second annular conveying structure and surrounding the second annular conveying structure to form a third annular passage for the gas stream, the third annular conveying structure being capable of adjusting the rotational flow intensity of the gas stream; and

[0011] a fourth annular conveying structure sleeved outside the third annular conveying structure and surrounding the third annular conveying structure to form a fourth annular passage for the gas stream, the fourth annular conveying structure being capable of adjusting the rotational flow intensity of the gas stream;

[0012] The first annular conveying structure, the second annular conveying structure, the third annular conveying structure and the fourth annular conveying structure are used for conveying the pulverized coal gas stream or the air gas stream.

[0013] In one of the embodiments, the first annular conveying structure comprises a first annular conveying pipe, a first tangential gas flow pipe and a first axial gas flow pipe, the first annular conveying pipe being sleeved outside the central pulverized coal conveying pipe and surrounding the central pulverized coal conveying pipe to form the first annular passage, the first tangential gas flow pipe being arranged at the side of the inlet of the first annular conveying pipe, the first axial gas flow pipe being located at the inlet of the first annular conveying pipe close to the central passage, the first tangential gas flow pipe being in communication with the first axial gas flow pipe and the first annular passage;

[0014] The first annular conveying structure further comprises a first adjusting member arranged on the first tangential gas flow pipe and the first axial gas flow pipe respectively, for adjusting the flow rate ratio of the first tangential gas flow pipe and the first axial gas flow pipe.

[0015] In one of the embodiments, the second annular conveying structure comprises a second annular conveying pipe, a second tangential gas flow pipe and a second axial gas flow pipe, the second annular conveying pipe being sleeved outside the first annular conveying pipe and surrounding the first annular conveying pipe to form the second annular passage, the second tangential gas flow pipe and the second axial gas flow pipe being arranged at the side of the inlet of the second annular conveying pipe, the second tangential gas flow pipe being in communication with the second axial gas flow pipe and the second annular passage;

[0016] The ring two conveying structure further comprises ring two flow adjusting members respectively arranged on the ring two tangential airflow pipes and the ring two axial airflow pipes, for adjusting the airflow flow rate ratio in the ring two tangential airflow pipes and the ring two axial airflow pipes.

[0017] In one of the embodiments, the ring three conveying structure comprises a ring three conveying pipe, ring three tangential airflow pipes and ring three axial airflow pipes, the ring three conveying pipe is sleeved outside the ring two conveying pipe and surrounds the ring two conveying pipe to form the ring three channel, the ring three tangential airflow pipes and the ring three axial airflow pipes are arranged on the sides of the inlet of the ring three conveying pipe, and the ring three tangential airflow pipes and the ring three axial airflow pipes are in communication with the ring three channel.

[0018] The ring three conveying structure further comprises ring three flow adjusting members respectively arranged on the ring three tangential airflow pipes and the ring three axial airflow pipes, for adjusting the airflow flow rate ratio in the ring three tangential airflow pipes and the ring three axial airflow pipes.

[0019] In one of the embodiments, the ring four conveying structure comprises a ring four conveying pipe, ring four tangential airflow pipes and ring four axial airflow pipes, the ring four conveying pipe is sleeved outside the ring three conveying pipe and surrounds the ring three conveying pipe to form the ring four channel, the ring four tangential airflow pipes and the ring four axial airflow pipes are arranged on the sides of the inlet of the ring four conveying pipe, and the ring four tangential airflow pipes and the ring four axial airflow pipes are in communication with the ring four channel.

[0020] The ring four conveying structure further comprises ring four flow adjusting members respectively arranged on the ring four tangential airflow pipes and the ring four axial airflow pipes, for adjusting the airflow flow rate ratio in the ring three tangential airflow pipes and the ring three axial airflow pipes.

[0021] In one of the embodiments, the number of the ring one tangential airflow pipes and the ring one axial airflow pipes is four, the four ring one tangential airflow pipes are evenly distributed along the tangential direction on the outer periphery of the inlet of the ring one conveying pipe, and the four axial airflow pipes are evenly distributed along the circumferential direction above the inlet of the ring one conveying pipe.

[0022] The number of the ring two tangential airflow pipes and the ring two axial airflow pipes is four, the four ring two axial airflow pipes are evenly distributed along the radial direction on the lateral side of the inlet of the ring two conveying pipe, and the four ring two tangential airflow pipes are evenly distributed along the tangential direction on the outer periphery of the inlet of the ring two conveying pipe and are located below the ring two axial airflow pipes.

[0023] The number of the ring three tangential air flow pipes and the ring three axial air flow pipes is four, the four ring three axial air flow pipes are evenly distributed along the radial direction at the circumferential side of the ring three conveying pipe inlet, and the four ring three tangential air flow pipes are evenly distributed along the tangential direction at the outer circumference of the ring three conveying pipe inlet and are located below the ring three axial air flow pipes.

[0024] The number of the ring four tangential air flow pipes and the ring four axial air flow pipes is four, the four ring four axial air flow pipes are evenly distributed along the radial direction at the circumferential side of the ring four conveying pipe inlet, and the four ring four tangential air flow pipes are evenly distributed along the tangential direction at the outer circumference of the ring four conveying pipe inlet and are located below the ring four axial air flow pipes.

[0025] In one of the embodiments, the inner walls of the ring one channel, the ring two channel, the ring three channel and the ring four channel are arranged in a streamline shape.

[0026] In one of the embodiments, the ring one channel, the ring two channel, the ring three channel and the ring four channel are all tapered flow passages from the inlet to the outlet.

[0027] A laboratory small-size cyclone coal powder burner, comprising:

[0028] A coal powder air flow pipe having a central channel for conveying a coal powder air flow and an inlet end and an outlet end at both ends of the central channel;

[0029] An inertial separation structure arranged in the coal powder air flow pipe for separating the coal powder air flow in the coal powder air flow pipe into a dense coal powder air flow and a dilute coal powder air flow; wherein the inertial separation structure comprises an adjustable baffle ring at the inlet of the coal powder air flow pipe and a guide pipe downstream of the adjustable baffle ring, the adjustable baffle ring has a first end and a second end with an outer diameter smaller than the first end, one of the first end and the second end is directed towards the inlet of the coal powder air flow pipe, and the other is directed towards the guide pipe, the guide pipe is located in the coal powder air flow pipe and is close to the outlet of the coal powder air flow pipe;

[0030] A ring three conveying structure is arranged outside the coal powder air flow pipe and surrounds the coal powder air flow pipe to form a ring three channel for air flow, and the ring three conveying structure can adjust the rotational flow intensity of the air flow; and

[0031] A ring four conveying structure is arranged outside the ring three conveying structure and surrounds the ring three conveying structure to form a ring four channel for air flow, and the ring four conveying structure can adjust the rotational flow intensity of the air flow.

[0032] In one of the embodiments, the inertial separation structure further comprises a rotating handle connected with the adjustable baffle ring, for adjusting the adjustable baffle ring to make the first end or the second end face the inlet of the pulverized coal gas flow pipe.

[0033] After the above technical solution is adopted, the present application has at least the following technical effects:

[0034] When the laboratory small-size cyclone pulverized coal burner of the present application works, the central passage conveys the pulverized coal gas flow, the ring one passage, the ring two passage, the ring three passage and the ring four passage convey the pulverized coal gas flow or the air flow respectively, and through the above multiple passages, multiple combustion modes close to the actual power station boiler cyclone pulverized coal burner can be flexibly organized. Moreover, by changing the pulverized coal gas flow density among the central passage, the ring one passage and the ring two passage, different types of pulverized coal concentration distribution and cyclone intensity can be constructed to simulate different combustion conditions. Also, by adjusting the air quantity and the cyclone intensity between the ring three passage and the ring four passage, the air distribution mode close to the actual cyclone pulverized coal burner can be constructed. Through the above multiple pulverized coal concentration and air distribution adjustment and combination, the problem that the experimental measurement results of the current experimental burner are difficult to reflect the actual cyclone pulverized coal burner combustion characteristics and guide the burner optimization design can be effectively solved, the combustion mode under different types of cyclone pulverized coal burners and different loads can be constructed, and the combustion characteristics of the actual cyclone burner and the optimization operation of the actual cyclone burner can be conveniently researched according to the experimental measurement results. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Fig. 1 is a cross-sectional structure schematic diagram of the laboratory small-size cyclone pulverized coal burner of the first embodiment of the present application;

[0036] Figure 2 Fig. 2 is a perspective view of the laboratory small-size cyclone pulverized coal burner shown in Fig. 1; Figure 1

[0037] Figure 3 Fig. 3 is a front view of the laboratory small-size cyclone pulverized coal burner shown in Fig. 1; Figure 2

[0038] Figure 4 Fig. 4 is a cross-sectional structure schematic diagram of the laboratory small-size cyclone pulverized coal burner of the second embodiment of the present application;

[0039] Figure 5 Fig. 5 is a cross-sectional structure schematic diagram of the laboratory small-size cyclone pulverized coal burner of the third embodiment of the present application;

[0040] Figure 6 Fig. 6 is a running flow chart of the laboratory small-size cyclone pulverized coal burner shown in Fig. 1; Figure 1

[0041] ​​​Wherein: 100, laboratory small size cyclone coal burner; 110, central coal conveying pipe; 111, central channel; 120, ring one conveying structure; 121, ring one conveying pipe; 1211, ring one channel; 122, ring one axial airflow pipe; 123, ring one tangential airflow pipe; 130, ring two conveying structure; 131, ring two conveying pipe; 1311, ring two channel; 132, ring two axial airflow pipe; 133, ring two tangential airflow pipe; 140, ring three conveying structure; 141, ring three conveying pipe; 1411, ring three channel; 142, ring three axial airflow pipe; 143, ring three tangential airflow pipe; 150, ring four conveying structure; 151, ring four conveying pipe; 1511, ring four channel; 152, ring four axial airflow pipe; 153, ring four tangential airflow pipe; 160, coal airflow pipe; 170, inertial separation structure; 171, adjustable baffle ring; 172, guide pipe; 173, rotating handle; 180, conical bluff body. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0043] The serial numbers of components in the present application, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application in terms of indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be 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 "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0045] Reference is made toFigures 1 to 3 The first embodiment of the present application provides a laboratory small-size swirl coal burner 100. The laboratory small-size swirl coal burner 100 is applied in a laboratory, and can be used to simulate the working conditions of an actual power plant boiler swirl coal burner based on the similarity and modeling theory. The laboratory small-size swirl coal burner 100 of the present application is used to construct the combustion mode under different types of swirl coal burners and different loads, so as to facilitate the research on the combustion characteristics of the actual swirl burner and guide the optimized operation of the actual swirl burner according to the experimental measurement results.

[0046] Referring to Figures 1 to 3 In an embodiment, the laboratory small-size swirl coal burner 100 includes a central coal powder conveying pipe 110, a ring one conveying structure 120, a ring two conveying structure 130, a ring three conveying structure 140, and a ring four conveying structure 150.

[0047] The central coal powder conveying pipe 110 has a central passage 111 for conveying the coal powder gas flow, and an inlet end and an outlet end located at both ends of the central passage 111. The ring one conveying structure 120 is sleeved outside the central coal powder conveying pipe 110 and surrounds the central coal powder conveying pipe 110 to form a ring one passage 1211 for the gas flow, and the ring one conveying structure 120 can adjust the swirl intensity of the gas flow. The ring two conveying structure 130 is sleeved outside the ring one conveying structure 120 and surrounds the ring one conveying structure 120 to form a ring two passage 1311 for the gas flow, and the ring two conveying structure 130 can adjust the swirl intensity of the gas flow. The ring three conveying structure 140 is sleeved outside the ring two conveying structure 130 and surrounds the ring two conveying structure 130 to form a ring three passage 1411 for the air flow, and the ring three conveying structure 140 can adjust the swirl intensity of the air flow. The ring four conveying structure 150 is sleeved outside the ring three conveying structure 140 and surrounds the ring three conveying structure 140 to form a ring four passage 1511 for the air flow, and the ring four conveying structure 150 can adjust the swirl intensity of the air flow.

[0048] The central coal powder conveying pipe 110 is used to convey the coal powder gas flow. The central coal powder conveying pipe 110 has an inlet end and an outlet end arranged oppositely. The coal powder gas flow enters the central coal powder conveying pipe 110 from the inlet end and is sent out through the outlet end of the central coal powder conveying pipe 110. The central coal powder conveying pipe 110 is a cylindrical pipe structure, and the hollow space inside the central coal powder conveying pipe 110 is the central passage 111, through which the coal powder gas flow is directly injected.

[0049] The ring one conveying structure 120, the ring two conveying structure 130, the ring three conveying structure 140 and the ring four conveying structure 150 are arranged on the outside of the central pulverized coal conveying pipe 110 from inside to outside. Specifically, the ring one conveying structure 120 is arranged on the outside of the central pulverized coal conveying pipe 110, the outlet of the ring one conveying structure 120 is flush with the outlet end of the central pulverized coal conveying pipe 110, and the ring one conveying structure 120 and the outer wall of the central pulverized coal conveying pipe 110 form a ring one channel 1211 for the flow of gas. The ring two conveying structure 130 is arranged on the outside of the ring one conveying structure 120, the outlet of the ring two conveying structure 130 is flush with the outlet of the ring one conveying structure 120, and the ring two conveying structure 130 and the outer wall of the ring one conveying structure 120 form a ring two channel 1311 for the flow of gas. The ring three conveying structure 140 is arranged on the outside of the ring two conveying structure 130, the outlet of the ring three conveying structure 140 is flush with the outlet of the ring two conveying structure 130, and the ring three conveying structure 140 and the outer wall of the ring two conveying structure 130 form a ring three channel 1411 for the flow of gas. The ring four conveying structure 150 is arranged on the outside of the ring three conveying structure 140, the outlet of the ring four conveying structure 150 is flush with the outlet of the ring three conveying structure 140, and the ring four conveying structure 150 and the outer wall of the ring three conveying structure 140 form a ring four channel 1511 for the flow of gas.

[0050] It can be understood that the ring one conveying structure 120, the ring two conveying structure 130, the ring three conveying structure 140 and the ring four conveying structure 150 can convey a pulverized coal gas flow or an air gas flow. For example, the ring one conveying structure 120 and the ring two conveying structure 130 can convey a pulverized coal gas flow, and the ring three conveying structure 140 and the ring four conveying structure 150 can convey an air gas flow; or the ring one conveying structure 120 can convey a pulverized coal gas flow, and the ring two conveying structure 130 and the ring three conveying structure 140 can convey an air gas flow, and the ring four conveying structure 150 can be closed; or the ring one conveying structure 120 and the ring three conveying structure 140 can convey a pulverized coal gas flow, and the ring two conveying structure 130 and the ring four conveying structure 150 can convey an air gas flow; or the like. The ring one conveying structure 120, the ring two conveying structure 130, the ring three conveying structure 140 and the ring four conveying structure 150 can convey at least one pulverized coal gas flow, so as to build different types of power station boiler cyclone pulverized coal burners and different load combustion modes, so as to obtain the combustion characteristics of the actual cyclone pulverized coal burner under different working conditions.

[0051] In this embodiment, only the ring one conveying structure 120 and the ring two conveying structure 130 convey a pulverized coal gas flow, and the ring three conveying structure 140 and the ring four conveying structure 150 convey an air gas flow are taken as examples for description, and the conveying principles of other conveying modes are substantially the same as those of the above-mentioned embodiments, which will not be described herein.

[0052] Specifically, the pulverized coal gas flow is delivered from the center pulverized coal delivery pipe 110, the ring one delivery structure 120 and the ring two delivery structure 130, the pulverized coal gas flow in the center pulverized coal delivery pipe 110 is directly injected, the ring one delivery structure 120 can adjust the swirl intensity of the pulverized coal gas flow in the ring one passage 1211, and the ring two delivery structure 130 can adjust the swirl intensity of the pulverized coal gas flow in the ring two passage 1311. The ring three delivery structure 140 can adjust the swirl intensity of the air gas flow in the ring three passage 1411, and the ring four delivery structure 150 can adjust the swirl intensity of the air gas flow in the ring four passage 1511.

[0053] The laboratory small-size swirl pulverized coal burner 100 of the present application can construct various types of pulverized coal concentration distribution modes. Specifically, by changing the pulverized coal gas flow concentration and swirl intensity among the center passage 111, the ring one passage 1211 and the ring two passage 1311, respectively, the pulverized coal concentration distribution of different types of power station boiler swirl pulverized coal burners can be constructed, including the distribution of high pulverized coal concentration in the center region and low pulverized coal concentration in the outer region, low pulverized coal concentration in the inner region and high pulverized coal concentration in the outer region, uniform distribution of pulverized coal concentration, and the flow of the inner pulverized coal gas flow in the axial direction and the flow of the outer pulverized coal gas flow in the tangential direction, so as to construct the combustion mode of different types of power station boiler swirl pulverized coal burners. Moreover, by adjusting the inlet air volume and outlet swirl intensity between the ring three passage 1411 and the ring four passage 1511, the air distribution mode close to the actual swirl pulverized coal burner can be constructed.

[0054] Through the adjustment and combination of the above-mentioned various pulverized coal concentrations, swirl intensities and air volume ratios, the problem that the experimental measurement results of the current experimental burners are difficult to reflect the actual swirl pulverized coal burner combustion characteristics and guide the optimization design of the burner can be effectively solved. The combustion mode under different types of swirl pulverized coal burners and under different loads can be constructed, which is convenient for studying the combustion characteristics of the actual swirl burner and guiding the optimization operation of the actual swirl burner according to the experimental measurement results.

[0055] Referring to Figures 1 to 3 In an embodiment, the ring one delivery structure 120 includes a ring one delivery pipe 121, a ring one tangential gas flow pipe 123 and a ring one axial gas flow pipe 122, the ring one delivery pipe 121 is sleeved outside the center pulverized coal delivery pipe 110 and surrounds the center pulverized coal delivery pipe 110 to form the ring one passage 1211, the ring one tangential gas flow pipe 123 is arranged at the side of the inlet of the ring one delivery pipe 121, the ring one axial gas flow pipe 122 is located at the position close to the center passage 111 at the inlet of the ring one delivery pipe 121, and the ring one tangential gas flow pipe 123 communicates with the ring one axial gas flow pipe 122 and the ring one passage 1211.

[0056] The inner wall of the ring one conveying pipe 121 and the outer wall of the central pulverized coal conveying pipe 110 form a ring one channel 1211 in an annular shape, which is used to convey the pulverized coal gas flow. After the pulverized coal gas flow enters the ring one channel 1211, it flows along the inner wall of the ring one channel 1211 and is sent out from the outlet of the ring one channel 1211. Moreover, the ring one tangential gas flow pipe 123 and the ring one axial gas flow pipe 122 convey the pulverized coal gas flow into the ring one channel 1211, and adjusting the flow rate ratio of the ring one tangential gas flow pipe 123 and the ring one axial gas flow pipe 122 can make the pulverized coal gas flow in the ring one channel 1211 straightly jet or have different rotational flow intensity.

[0057] In an embodiment, the ring one tangential gas flow pipe 123 is arranged on the circumferential side of the ring one conveying pipe 121 in a tangential direction and communicates with the inlet of the ring one channel 1211, so as to ensure that the ring one tangential gas flow pipe 123 conveys the tangential gas flow. The ring one axial gas flow pipe 122 is arranged at the inlet of the ring one conveying pipe 121 in an axial direction and is close to the central pulverized coal conveying pipe 110, so as to ensure that the ring one axial gas flow pipe 122 conveys the axial gas flow.

[0058] In an embodiment, the number of the ring one tangential gas flow pipe 123 is four, the four ring one tangential gas flow pipes 123 are uniformly distributed on the circumferential side of the ring one conveying pipe 121, and the four ring one tangential gas flow pipes 123 are located on the upper part of the side of the inlet of the ring one channel 1211 and are located on the same horizontal plane and are arranged horizontally. The number of the ring one axial gas flow pipe 122 is four, the four ring one axial gas flow pipes 122 are uniformly distributed above the ring one conveying pipe 121 and are arranged in a vertical direction. Of course, in other embodiments of the present application, the number of the ring one tangential gas flow pipe 123 can also be two or other symmetrical number, and the number of the ring one axial gas flow pipe 122 can also be two or other symmetrical number.

[0059] In an embodiment, the ring one conveying structure 120 further comprises a ring one adjusting member (not shown) arranged on the ring one tangential gas flow pipe 123 and the ring one axial gas flow pipe 122 respectively, which is used to adjust the flow rate ratio of the ring one tangential gas flow pipe 123 and the ring one axial gas flow pipe 122. Optionally, the ring one adjusting member is a valve, which opens and closes the ring one tangential gas flow pipe 123 and the ring one axial gas flow pipe 122, and the valve can also adjust the flow area of the ring one tangential gas flow pipe 123 and the ring one axial gas flow pipe 122 to adjust the flow rate ratio of the ring one tangential gas flow pipe 123 and the ring one axial gas flow pipe 122, so as to adjust the rotational flow intensity at the outlet of the ring one channel 1211. It can be understood that the ring one adjusting member can adopt the existing valve form, which can be manually controlled or automatically controlled by a control element, which will not be described here.

[0060] In an embodiment, the ring two conveying structure 130 comprises a ring two conveying pipe 131, a ring two tangential gas flow pipe 133 and a ring two axial gas flow pipe 132, the ring two conveying pipe 131 is sleeved outside the ring one conveying pipe 121 and surrounds the ring one conveying pipe 121 to form a ring two channel 1311, the ring two tangential gas flow pipe 133 and the ring two axial gas flow pipe 132 are arranged on the side of the inlet of the ring two conveying pipe 131, and the ring two tangential gas flow pipe 133 communicates with the ring two axial gas flow pipe 132 and the ring two channel 1311.

[0061] The inner wall of the ring two conveying pipe 131 and the outer wall of the ring one conveying pipe 121 surround the ring two channel 1311 in a ring shape, and the ring two channel 1311 is used for conveying the pulverized coal gas flow. After the pulverized coal gas flow enters the ring two channel 1311, the pulverized coal gas flow flows along the inner wall of the ring two channel 1311 and is sent out from the outlet of the ring two channel 1311. Moreover, the ring two tangential gas flow pipe 133 and the ring two axial gas flow pipe 132 convey the pulverized coal gas flow into the ring two channel 1311, and adjusting the flow ratio of the ring two tangential gas flow pipe 133 and the ring two axial gas flow pipe 132 can make the pulverized coal gas flow in the ring two channel 1311 straightly jet or have different rotational flow intensity.

[0062] In an embodiment, the ring two tangential gas flow pipe 133 is arranged on the circumferential side of the ring two conveying pipe 131 in a tangential direction and communicates with the inlet of the ring two channel 1311, so as to ensure that the ring two tangential gas flow pipe 133 conveys the tangential gas flow. The ring two axial gas flow pipe 132 is arranged at the inlet of the ring two conveying pipe 131 in a radial direction, so as to ensure that the ring two axial gas flow pipe 132 conveys the axial gas flow.

[0063] In an embodiment, the number of the ring two axial gas flow pipe 132 is four, the four ring two axial gas flow pipes 132 are uniformly distributed above the side of the inlet of the ring two channel 1311, the four ring two axial gas flow pipes 132 are located on the same horizontal plane and are arranged horizontally. The number of the ring two tangential gas flow pipe 133 is four, the four ring two tangential gas flow pipes 133 are uniformly distributed on the circumferential side of the ring two conveying pipe 131, the four ring two tangential gas flow pipes 133 are located on the same horizontal plane, the four ring two tangential gas flow pipes 133 are arranged below the ring two axial gas flow pipe 132 and are arranged horizontally. Of course, in other embodiments of the present application, the number of the ring two tangential gas flow pipe 133 can also be two or other symmetrical number, and the number of the ring two axial gas flow pipe 132 can also be two or other symmetrical number.

[0064] In an embodiment, the ring two conveying structure 130 further comprises ring two adjusting members (not shown) arranged on the ring two tangential air flow pipe 133 and the ring two axial air flow pipe 132 respectively, for adjusting the air flow rate ratio of the ring two tangential air flow pipe 133 and the ring two axial air flow pipe 132. Optionally, the ring two adjusting members are valves, which are switched on and off to the ring two tangential air flow pipe 133 and the ring two axial air flow pipe 132, and the valves can also adjust the flow area of the ring two tangential air flow pipe 133 and the ring two axial air flow pipe 132, so as to adjust the air flow rate ratio of the ring two tangential air flow pipe 133 and the ring two axial air flow pipe 132, and achieve the purpose of adjusting the rotational flow intensity at the outlet of the ring two passage 1311. It can be understood that the ring two adjusting members can adopt the existing valve form, which can be manually controlled or automatically controlled by a control element, which will not be described here.

[0065] In an embodiment, the ring three conveying structure 140 comprises a ring three conveying pipe 141, a ring three tangential air flow pipe 143 and a ring three axial air flow pipe 142, the ring three conveying pipe 141 is sleeved outside the ring two conveying pipe 131 and surrounds the ring two conveying pipe 131 to form a ring three passage 1411, the ring three tangential air flow pipe 143 and the ring three axial air flow pipe 142 are arranged on the side of the inlet of the ring three conveying pipe 141, and the ring three tangential air flow pipe 143 and the ring three axial air flow pipe 142 are in communication with the ring three passage 1411.

[0066] The inner wall of the ring three conveying pipe 141 and the outer wall of the ring two conveying pipe 131 surround the ring three passage 1411 in a ring shape, which is used for conveying air flow. After the air flow enters the ring three passage 1411, it flows along the inner wall of the ring three passage 1411 and is sent out from the outlet of the ring three passage 1411. Moreover, the ring three tangential air flow pipe 143 and the ring three axial air flow pipe 142 convey air flow for supplementary combustion of the pulverized coal, and adjusting the air flow rate ratio of the ring three tangential air flow pipe 143 and the ring three axial air flow pipe 142 can make the air flow in the ring three passage 1411 straightly jet or have different rotational flow intensities.

[0067] In an embodiment, the ring three tangential air flow pipe 143 is arranged on the circumferential side of the ring three conveying pipe 141 in a tangential direction and is in communication with the inlet of the ring three passage 1411, so as to ensure that the ring three tangential air flow pipe 143 conveys tangential air flow. The ring three axial air flow pipe 142 is arranged at the inlet of the ring three conveying pipe 141 in a radial direction, so as to ensure that the ring three axial air flow pipe 142 conveys axial air flow.

[0068] In an embodiment, the number of the annular three axial airflow pipes 142 is four, which are evenly distributed above the side surface of the inlet of the annular three channel 1411, and are arranged horizontally in the same horizontal plane. The number of the annular three tangential airflow pipes 143 is four, which are evenly distributed on the circumferential side of the annular three conveying pipe 141, and are arranged horizontally in the same horizontal plane below the annular three axial airflow pipes 142. Of course, in other embodiments of the present application, the number of the annular three tangential airflow pipes 143 can also be two or other symmetrical number, and the number of the annular three axial airflow pipes 142 can also be two or other symmetrical number.

[0069] In an embodiment, the annular three conveying structure 140 further comprises annular three airflow adjusting members (not shown) arranged on the annular three tangential airflow pipes 143 and the annular three axial airflow pipes 142 respectively, for adjusting the airflow flow rate ratio of the annular three tangential airflow pipes 143 and the annular three axial airflow pipes 142. Optionally, the annular three adjusting member is a valve, which can adjust the flow area of the annular three tangential airflow pipes 143 and the annular three axial airflow pipes 142, so as to adjust the airflow flow rate ratio of the annular three tangential airflow pipes 143 and the annular three axial airflow pipes 142, and achieve the purpose of adjusting the rotational flow intensity at the outlet of the annular three channel 1411. It can be understood that the annular three adjusting member can adopt the existing valve form, which can be manually controlled or automatically controlled by a control element, and will not be described here.

[0070] In an embodiment, the annular four conveying structure 150 comprises an annular four conveying pipe 151, an annular four tangential airflow pipe 153 and an annular four axial airflow pipe 152. The annular four conveying pipe 151 is sleeved outside the annular three conveying pipe 141, and forms an annular four channel 1511 together with the annular three conveying pipe 141. The annular four tangential airflow pipe 153 and the annular four axial airflow pipe 152 are arranged on the side surface of the inlet of the annular four conveying pipe 151, and are in communication with the annular four channel 1511.

[0071] The inner wall of the ring four conveying pipe 151 and the outer wall of the ring three conveying pipe 141 form a ring four channel 1511 in an annular shape, which is used to convey air flow. After the air flow enters the ring four channel 1511, it flows along the inner wall of the ring four channel 1511 and is sent out from the outlet of the ring four channel 1511. Moreover, the ring four tangential flow pipe 153 and the ring four axial flow pipe 152 convey air flow for supplementary pulverized coal combustion into the ring four channel 1511, and the flow ratio of the ring four tangential flow pipe 153 and the ring four axial flow pipe 152 can be adjusted to make the air flow in the ring four channel 1511 straight jet or have different rotational flow intensity.

[0072] In an embodiment, the ring four tangential flow pipe 153 is arranged at the circumferential side of the ring four conveying pipe 151 in a tangential direction and communicates with the inlet of the ring four channel 1511, so as to ensure that the ring four tangential flow pipe 153 conveys tangential flow. The ring four axial flow pipe 152 is arranged at the inlet of the ring four conveying pipe 151 in a radial direction, so as to ensure that the ring four axial flow pipe 152 conveys axial flow.

[0073] In an embodiment, the number of the ring four axial flow pipes 152 is four, and the four ring four axial flow pipes 152 are uniformly distributed above the side of the inlet of the ring four channel 1511, and the four ring four axial flow pipes 152 are located in the same horizontal plane and are arranged horizontally. The number of the ring four tangential flow pipes 153 is four, and the four ring four tangential flow pipes 153 are uniformly distributed at the circumferential side of the ring four conveying pipe 151, and the four ring four tangential flow pipes 153 are located in the same horizontal plane and are arranged horizontally below the ring four axial flow pipes 152. Of course, in other embodiments of the present application, the number of the ring four tangential flow pipes 153 can also be two or other symmetrical number, and the number of the ring four axial flow pipes 152 can also be two or other symmetrical number.

[0074] In an embodiment, the ring four conveying structure 150 further comprises a ring four flow adjusting member (not shown) arranged on the ring four tangential flow pipe 153 and the ring four axial flow pipe 152 respectively, which is used to adjust the flow ratio of the ring four tangential flow pipe 153 and the ring four axial flow pipe 152. Optionally, the ring four adjusting member is a valve, which is used to open and close the ring four tangential flow pipe 153 and the ring four axial flow pipe 152, and the valve can also adjust the flow area of the ring four tangential flow pipe 153 and the ring four axial flow pipe 152 to adjust the flow ratio of the ring four tangential flow pipe 153 and the ring four axial flow pipe 152, so as to adjust the rotational flow intensity at the outlet of the ring four channel 1511. It can be understood that the ring four adjusting member can adopt the existing valve form, which can be manually controlled or automatically controlled by a control element, and details are not described herein.

[0075] In an embodiment, the sizes of the ring one delivery pipe 121, the ring two delivery pipe 131, the ring three delivery pipe 141 and the ring four delivery pipe 151 gradually decrease along the axial direction. And, the outlets of the ring one delivery pipe 121, the ring two delivery pipe 131, the ring three delivery pipe 141 and the ring four delivery pipe 151 are flush with each other. In this way, the ring one delivery pipe 121 is exposed at the inlet of the ring two delivery pipe 131, facilitating the arrangement of the ring one axial airflow pipe 122 and the ring one tangential airflow pipe 123. The ring two delivery pipe 131 is exposed at the inlet of the ring three delivery pipe 141, facilitating the arrangement of the ring two axial airflow pipe 132 and the ring two tangential airflow pipe 133. The ring three delivery pipe 141 is exposed at the inlet of the ring four delivery pipe 151, facilitating the arrangement of the ring three axial airflow pipe 142 and the ring three tangential airflow pipe 143.

[0076] In an embodiment, the inner walls of the ring one passage 1211, the ring two passage 1311, the ring three passage 1411 and the ring four passage 1511 are all arranged in a streamline shape. That is to say, in the ring one passage 1211, the outer wall of the central pulverized coal delivery pipe 110 and the inner wall of the ring one delivery pipe 121 are both arranged in a streamline shape, facilitating the airflow to flow; in the ring two passage 1311, the outer wall of the ring one delivery pipe 121 and the inner wall of the ring two delivery pipe 131 are both arranged in a streamline shape, facilitating the airflow to flow; in the ring three passage 1411, the outer wall of the ring two delivery pipe 131 and the inner wall of the ring three delivery pipe 141 are both arranged in a streamline shape, facilitating the airflow to flow; in the ring four passage 1511, the outer wall of the ring three delivery pipe 141 and the inner wall of the ring four delivery pipe 151 are both arranged in a streamline shape, facilitating the airflow to flow.

[0077] In an embodiment, the ring one passage 1211, the ring two passage 1311, the ring three passage 1411 and the ring four passage 1511 are all convergent flow passages from the inlet to the outlet. That is to say, in the ring one passage 1211, the size of the inlet of the ring one passage 1211 is greater than the size of the outlet of the ring one passage 1211, and the size between the inlet and the outlet of the ring one passage 1211 gradually decreases and smoothly transitions. In the ring two passage 1311, the size of the inlet of the ring two passage 1311 is greater than the size of the outlet of the ring two passage 1311, and the size between the inlet and the outlet of the ring two passage 1311 gradually decreases and smoothly transitions. In the ring three passage 1411, the size of the inlet of the ring three passage 1411 is greater than the size of the outlet of the ring three passage 1411, and the size between the inlet and the outlet of the ring three passage 1411 gradually decreases and smoothly transitions. In the ring four passage 1511, the size of the inlet of the ring four passage 1511 is greater than the size of the outlet of the ring four passage 1511, and the size between the inlet and the outlet of the ring four passage 1511 gradually decreases and smoothly transitions.

[0078] The laboratory small-size cyclone coal burner 100 of the present application is full-load operated, the central passage 111, the ring one passage 1211 and the ring two passage 1311 in the middle region are coal powder airflow passages, and the ring three passage 1411 and the ring four passage 1511 in the outer region are air airflow passages. The central passage 111 is a straight-flow nozzle; by adjusting the coal powder airflow flow ratio between the ring one axial airflow pipe 122 and the ring one tangential airflow pipe 123, the outlet of the ring one passage 1211 can be adjusted to be straight flow or have different swirling intensities; by adjusting the coal powder airflow flow ratio between the ring two axial airflow pipe 132 and the ring two tangential airflow pipe 133, the outlet of the ring two passage 1311 can be adjusted to be straight flow or have different swirling intensities. At the same time, by adjusting the air flow ratio between the ring three axial airflow pipe 142 and the ring three tangential airflow pipe 143, the outlet of the ring three passage 1411 can be adjusted to have different swirling intensities; by adjusting the air flow ratio between the ring four axial airflow pipe 152 and the ring four tangential airflow pipe 153, the outlet of the ring four passage 1511 can be adjusted to have different swirling intensities.

[0079] The above-described multi-layer passages can flexibly organize various combustion modes close to the actual power plant boiler cyclone coal burner. In terms of constructing various types of coal powder concentration distribution, the coal powder concentration distribution of different types can be constructed by changing the coal powder airflow concentration among the central passage 111, the ring one passage 1211 and the ring two passage 1311, including high coal powder concentration in the central region and low concentration in the outer region, high coal powder concentration in the outer region and low concentration in the central region, uniform distribution of coal powder concentration, and coal powder airflow flow distribution of axial flow of coal powder airflow in the central region plus tangential rotation of coal powder airflow in the outer region. By adjusting the inlet air volume and outlet swirling intensity between the outer ring three passage 1411 and the ring four passage 1511, the air distribution mode close to the actual cyclone coal burner can be constructed. Through the above adjustment and combination of various coal powder concentration and air distribution, the combustion mode under different types of cyclone coal burners and under different loads can be constructed.

[0080] Referring to Figure 1 , Figure 2 and Figure 6Specifically, in the construction of the coal powder outer thick and inner thin combustion and the air distribution adjustment under different loads, the center passage 111 inputs the straight-through low-concentration coal powder gas flow (coal powder concentration is 0-0.1 kg / kg); the ring one passage 1211 inputs the medium-concentration coal powder gas flow (coal powder concentration is 0.1-0.6 kg / kg), and the swirling intensity of the medium-concentration coal powder gas flow can be adjusted; the ring two passage 1311 inputs the high-concentration coal powder gas flow (coal powder concentration is 0.6-1.8 kg / kg), and the swirling intensity of the high-concentration coal powder gas flow can be adjusted; the ring three passage 1411 inputs the rotating air gas flow, and the swirling intensity of the rotating air gas flow can be adjusted; and the ring four passage 1511 inputs the rotating air gas flow, and the swirling intensity of the rotating air gas flow can be adjusted.

[0081] In the construction of the coal powder inner thick and outer thin combustion and the air distribution adjustment under different loads, the center passage 111 inputs the straight-through high-concentration coal powder gas flow (coal powder concentration is 0.6-1.8 kg / kg); the ring one passage 1211 inputs the medium-concentration coal powder gas flow (coal powder concentration is 0.1-0.6 kg / kg), and the swirling intensity of the medium-concentration coal powder gas flow can be adjusted; the ring two passage 1311 inputs the low-concentration coal powder gas flow (coal powder concentration is 0-0.1 kg / kg), and the swirling intensity of the low-concentration coal powder gas flow can be adjusted; the ring three passage 1411 inputs the rotating air gas flow, and the swirling intensity of the rotating air gas flow can be adjusted; and the ring four passage 1511 inputs the rotating air gas flow, and the swirling intensity of the rotating air gas flow can be adjusted.

[0082] In the construction of the coal powder uniform concentration combustion and the air distribution adjustment under different loads, the center passage 111 inputs the straight-through uniform concentration coal powder gas flow (coal powder concentration is 0.4-0.8 kg / kg); the ring one passage 1211 inputs the straight-through uniform concentration coal powder gas flow (coal powder concentration is 0.4-0.8 kg / kg); the ring two passage 1311 inputs the straight-through uniform concentration coal powder gas flow (coal powder concentration is 0.4-0.8 kg / kg); the ring three passage 1411 inputs the rotating air gas flow, and the swirling intensity of the rotating air gas flow can be adjusted; and the ring four passage 1511 inputs the rotating air gas flow, and the swirling intensity of the rotating air gas flow can be adjusted.

[0083] The laboratory small-size cyclone coal powder burner 100 in the embodiment realizes the adjustment of the swirling intensity at the outlet of the laboratory small-size cyclone coal powder burner 100 by adjusting the air volume ratio between the axial gas flow and the tangential gas flow without increasing the swirling adjustment vanes, so as to realize the flexible and continuous adjustment of the gas flow swirling intensity of the laboratory small-size cyclone coal powder burner 100.

[0084] And, the laboratory small-size coal-pulverized fuel burner 100 of the present application can simulate the combustion modes of various types of actual power plant boiler coal-pulverized fuel burners, and can realize flexible adjustment of various coal-pulverized fuel concentrations, air distribution and swirl intensities, thus being able to realize systematic experimental measurement of various types of coal-pulverized fuel burners. The laboratory small-size coal-pulverized fuel burner 100 has a small size, and can reduce the test bench construction and operation costs, and also avoid the problems of long experimental period and high cost caused by frequent replacement of the components of the laboratory small-size coal-pulverized fuel burner 100 under variable experimental conditions. The laboratory small-size coal-pulverized fuel burner 100 has the advantages of compact structure, continuous adjustment, low cost and flexible adjustment, and can be used as an important research method for performance research of existing types of coal-pulverized fuel burners and development of new burners.

[0085] Referring to Figure 4 The second embodiment of the present application is a laboratory small-size coal-pulverized fuel burner 100. The laboratory small-size coal-pulverized fuel burner 100 is applied in a laboratory, and is used to simulate the working conditions of actual coal-pulverized fuel burners.

[0086] In an embodiment, the laboratory small-size coal-pulverized fuel burner 100 includes a coal-pulverized fuel flow pipe 160, an inertial separation structure 170, a ring three conveying structure 140 and a ring four conveying structure 150. Compared with the laboratory small-size coal-pulverized fuel burner 100 in the first embodiment, the laboratory small-size coal-pulverized fuel burner 100 in this embodiment only has three layers of channels, i.e., the ring one conveying structure 120 and the ring two conveying structure 130 are removed, and the inertial separation structure 170 is added. The three layers of channels are used to adjust different types of coal-pulverized fuel combustion modes.

[0087] The coal-pulverized fuel flow pipe 160 is a channel for conveying coal-pulverized fuel flow, and the two ends of the coal-pulverized fuel flow pipe 160 are respectively an inlet end and an outlet end. The inertial separation structure 170 is arranged in the coal-pulverized fuel flow pipe 160, and is used to separate the coal-pulverized fuel flow in the coal-pulverized fuel flow pipe 160 into a thick coal-pulverized fuel flow and a thin coal-pulverized fuel flow. The ring three conveying structure 140 is sleeved outside the coal-pulverized fuel flow pipe 160, and surrounds the coal-pulverized fuel flow pipe 160 to form a ring three channel 1411 for air flow, and the ring three conveying structure 140 can adjust the swirl intensity of the air. The ring four conveying structure 150 is sleeved outside the ring three conveying structure 140, and surrounds the ring three conveying structure 140 to form a ring four channel 1511 for air flow, and the ring four conveying structure 150 can adjust the swirl intensity of the air.

[0088] The coal powder airflow pipe 160 is a main structure for conveying the coal powder airflow. The coal powder airflow pipe 160 has oppositely arranged inlet and outlet ends. The coal powder airflow enters the coal powder airflow pipe 160 from the inlet end and is sent out through the outlet end of the coal powder airflow pipe 160. The coal powder airflow pipe 160 is a straight pipe structure and is located in the central region of the ring three conveying structure 140. The specific structure and working principle of the ring three conveying structure 140 and the ring four conveying structure 150 have been described in detail in the first embodiment, and will not be described here.

[0089] The inertial separation structure 170 is used for separating the coal powder airflow, separating the coal powder airflow into a light coal powder airflow and a dense coal powder airflow, and conveying the light coal powder airflow and the dense coal powder airflow respectively, so that the light coal powder airflow and the dense coal powder airflow are burned at the outlet of the coal powder airflow pipe 160. It can be understood that, according to the dense and light coal powder combustion technology, the coal powder airflow is separated into two airflow for combustion. Under the premise that the total amount of primary air is unchanged, the coal powder concentration of the dense coal powder airflow is high, and the ignition heat is small, which is beneficial to the ignition and flame propagation of the coal powder airflow. At the same time, the coal powder airflow under the condition of fuel enrichment has a small NOx generation amount, and the dense coal powder airflow can provide an ignition heat source for the light coal powder airflow after ignition, so that the stability of the entire torch combustion is enhanced. x The generation amount is small, and the dense coal powder airflow can provide an ignition heat source for the light coal powder airflow after ignition, so that the stability of the entire torch combustion is enhanced.

[0090] Specifically, the inertial separation structure 170 includes an adjustable baffle ring 171 located at the inlet of the coal powder airflow pipe 160 and a guide pipe 172 located downstream of the adjustable baffle ring 171. The adjustable baffle ring 171 has a first end and a second end with an outer diameter smaller than the first end. One of the first end and the second end faces the inlet of the coal powder airflow pipe 160, and the other end faces the guide pipe 172. The guide pipe 172 is located in the coal powder airflow pipe 160 and is close to the outlet of the coal powder airflow pipe 160.

[0091] The two ends of the adjustable baffle ring 171 are divided into a first end and a second end, and the diameter of the first end is larger than the diameter of the second end. The size of the adjustable baffle ring 171 decreases smoothly from the first end to the second end. The adjustable baffle ring 171 is arranged at the inlet of the coal powder airflow pipe 160 by connection. After the coal powder airflow enters the coal powder airflow pipe 160, it first contacts the adjustable baffle ring 171, and the coal powder particles collide with the adjustable baffle ring 171, which can produce a concentration effect on the coal powder particles. When the first end of the adjustable baffle ring 171 faces the inlet of the coal powder airflow pipe 160, the coal powder particles first meet the first end with a large diameter. Due to the converging structure along the flow direction, the particles are more easily gathered in the central region after collision, forming a concentration distribution with high coal powder concentration in the central region and low coal powder concentration around. Conversely, when the second end of the adjustable baffle ring 171 faces the inlet of the coal powder airflow pipe 160, a concentration distribution with low coal powder concentration in the central region and high coal powder concentration around is formed, so that the laboratory small-size cyclone coal powder burner 100 realizes different coal powder concentration combustion modes.

[0092] Further, the coal powder airflow pipe 160 is provided with a guide pipe 172. The guide pipe 172 is a straight pipe structure and is arranged on the central axis of the coal powder airflow pipe 160 close to the outlet of the coal powder airflow pipe 160. The guide pipe 172 is fixed in the coal powder airflow pipe 160 by a plurality of fixing ribs. The guide pipe 172 is beneficial to guide the dense coal powder airflow and the dilute coal powder airflow separated by the adjustable baffle ring 171 and avoid the mixing of the two adjacent dense and dilute coal powder airflows in the subsequent flow process.

[0093] In an embodiment, the inertial separation structure 170 further comprises a rotating handle 173 connected with the adjustable baffle ring 171 for adjusting the adjustable baffle ring 171 so that the first end or the second end faces the inlet of the coal powder airflow pipe 160. The rotating handle 173 is connected with the adjustable baffle ring 171 through a connecting shaft. The rotating handle 173 is rotated to drive the adjustable baffle ring 171 to rotate so as to adjust the position of the adjustable baffle ring 171 so that the first end faces the inlet of the coal powder airflow pipe 160 or the second end faces the inlet of the coal powder airflow pipe 160, thereby changing the coal powder concentration distribution of the coal powder airflow after flowing through the baffle ring, realizing the coal powder concentration distribution that the coal powder concentration in the central region is high and the coal powder concentration in the outer region is low or the coal powder concentration in the outer region is high and the coal powder concentration in the central region is low, and thereby realizing the flexible adjustment of the coal powder concentration distribution.

[0094] Referring to Figure 5 The third embodiment of the present application provides a laboratory small-size cyclone coal powder burner 100. The laboratory small-size cyclone coal powder burner 100 adopts the way of constructing the bluff body cyclone coal powder combustion by increasing the bluff body. Specifically, the laboratory small-size cyclone coal powder burner 100 comprises a coal powder airflow pipe 160, a conical bluff body 180, a ring three conveying structure 140 and a ring four conveying structure 150. Compared with the second embodiment, the laboratory small-size cyclone coal powder burner 100 in the embodiment is different in that the conical bluff body 180 is used to replace the inertial separation structure 170, and the rest structures and principles are the same as those of the fourth embodiment, which will not be described here.

[0095] The coal powder airflow pipe 160 has a central channel 111 for conveying the coal powder airflow, and an inlet end and an outlet end located at two ends of the central channel 111. The conical bluff body 180 is arranged in the coal powder airflow pipe 160 and is close to the outlet of the coal powder airflow pipe 160, and is used to build a high-temperature flue gas backflow area. In addition, the conical bluff body 180 is fixed in the coal powder airflow pipe 160 by the fixing ribs. The ring three conveying structure 140 is sleeved outside the coal powder airflow pipe 160 and surrounds the coal powder airflow pipe 160 to form a ring three channel 1411 for air flow, and the ring three conveying structure 140 can adjust the rotational flow intensity of the air flow. The ring four conveying structure 150 is sleeved outside the ring three conveying structure 140 and surrounds the ring three conveying structure 140 to form a ring four channel 1511 for air flow, and the ring four conveying structure 150 can adjust the rotational flow intensity of the air flow.

[0096] The conical bluff body 180 includes a tip, a cylindrical segment and a conical segment connected in sequence, and the tip is directed to the inlet of the coal powder airflow pipe 160. The number of fixing ribs is multiple, and the fixing ribs are distributed on the outer periphery of the conical bluff body 180 to fix the conical bluff body 180 in the coal powder airflow pipe 160. After the coal powder airflow enters the coal powder airflow pipe 160, a low-pressure area can be formed downstream of the conical bluff body 180 in the process of flowing through the conical bluff body 180, so that the high-temperature airflow backflow area is built downstream of the conical bluff body 180, which is beneficial to the stable combustion of the coal powder.

[0097] The technical features of the above-described embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the description range of the present application.

[0098] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A small-sized laboratory swirl pulverized coal burner, characterized in that, include: A central pulverized coal conveying pipe, wherein the central pulverized coal conveying pipe has a central channel for conveying pulverized coal gas flow and an inlet end and an outlet end located at both ends of the central channel; A ring-shaped conveying structure includes a ring-shaped conveying pipe, a ring-shaped tangential airflow pipe, and a ring-shaped axial airflow pipe. The ring-shaped conveying pipe is sleeved on the outside of the central pulverized coal conveying pipe and forms a ring-shaped channel with the central pulverized coal conveying pipe. The ring-shaped tangential airflow pipe and the ring-shaped axial airflow pipe are connected to the ring-shaped conveying pipe. The ring-shaped tangential airflow pipe conveys airflow in the tangential direction, and the ring-shaped axial airflow pipe conveys airflow in the axial direction. The ring-shaped tangential airflow pipe is located on the side of the inlet of the ring-shaped conveying pipe, and the ring-shaped axial airflow pipe is located at the inlet of the ring-shaped conveying pipe near the central channel. The ring-shaped tangential airflow pipe, the ring-shaped axial airflow pipe, and the ring-shaped channel are connected. The swirling intensity of the airflow can be adjusted by adjusting the flow rate ratio between the airflow conveyed by the ring-shaped tangential airflow pipe and the ring-shaped axial airflow pipe. The second annular conveying structure includes a second annular conveying pipe, a second annular tangential airflow pipe, and a second annular axial airflow pipe. The second annular conveying pipe is sleeved on the outside of the first annular conveying pipe and together with the first annular conveying pipe to form a second annular channel. The second annular tangential airflow pipe and the second annular axial airflow pipe are connected to the second annular conveying pipe. The second annular tangential airflow pipe conveys airflow in the tangential direction, and the second annular axial airflow pipe conveys airflow in the axial direction. Both the second annular tangential airflow pipe and the second annular axial airflow pipe are located on the side of the inlet of the second annular conveying pipe. The second annular tangential airflow pipe, the second annular axial airflow pipe, and the second annular channel are connected. The swirling intensity of the airflow can be adjusted by adjusting the flow rate ratio between the airflow conveyed by the second annular tangential airflow pipe and the second annular axial airflow pipe. A three-ring conveying structure includes a three-ring conveying pipe, a three-ring tangential airflow pipe, and a three-ring axial airflow pipe. The three-ring conveying pipe is sleeved outside the two-ring conveying pipe and together they form a three-ring channel. The three-ring tangential airflow pipe and the three-ring axial airflow pipe are connected to the three-ring conveying pipe. The three-ring tangential airflow pipe conveys airflow in the tangential direction, and the three-ring axial airflow pipe conveys airflow in the axial direction. Both the three-ring tangential airflow pipe and the three-ring axial airflow pipe are located on the side of the inlet of the three-ring conveying pipe. The three-ring tangential airflow pipe, the three-ring axial airflow pipe, and the three-ring channel are connected. The swirling intensity of the airflow can be adjusted by changing the flow rate ratio between the airflows conveyed by the three-ring tangential airflow pipe and the three-ring axial airflow pipe. The four-ring conveying structure includes a four-ring conveying pipe, a four-ring tangential airflow pipe, and a four-ring axial airflow pipe. The four-ring conveying pipe is sleeved on the outside of the three-ring conveying pipe and together with the three-ring conveying pipe to form a four-ring channel. The four-ring tangential airflow pipe and the four-ring axial airflow pipe are connected to the four-ring conveying pipe. The four-ring tangential airflow pipe conveys airflow in the tangential direction, and the four-ring axial airflow pipe conveys airflow in the axial direction. Both the four-ring tangential airflow pipe and the four-ring axial airflow pipe are located on the side of the inlet of the four-ring conveying pipe. The four-ring tangential airflow pipe, the four-ring axial airflow pipe, and the four-ring channel are connected. The swirling intensity of the airflow can be adjusted by adjusting the flow rate ratio between the airflow conveyed by the four-ring tangential airflow pipe and the four-ring axial airflow pipe. The first ring conveying structure, the second ring conveying structure, the third ring conveying structure, and the fourth ring conveying structure are used to convey pulverized coal gas flow or air flow. The inner walls of the first ring channel, the second ring channel, the third ring channel, and the fourth ring channel are all streamlined. The first ring channel, the second ring channel, the third ring channel, and the fourth ring channel are all gradually narrowing channels from the inlet to the outlet.

2. The laboratory-scale small-size swirl pulverized coal burner according to claim 1, characterized in that, The ring-one conveying structure also includes a ring-one adjusting component, which is respectively disposed on the ring-one tangential airflow pipe and the ring-one axial airflow pipe, and is used to adjust the airflow ratio in the ring-one tangential airflow pipe and the ring-one axial airflow pipe.

3. The laboratory-scale small-size swirl pulverized coal burner according to claim 2, characterized in that, The second ring conveying structure also includes a second ring adjusting component, which is respectively disposed on the second ring tangential airflow pipe and the second ring axial airflow pipe, and is used to adjust the airflow ratio in the second ring tangential airflow pipe and the second ring axial airflow pipe.

4. The laboratory-scale small-size swirl pulverized coal burner according to claim 3, characterized in that, The three-ring conveying structure also includes a three-ring airflow regulating component, which is respectively disposed on the three-ring tangential airflow pipe and the three-ring axial airflow pipe, and is used to adjust the airflow ratio in the three-ring tangential airflow pipe and the three-ring axial airflow pipe.

5. The laboratory-scale small-size swirl pulverized coal burner according to claim 4, characterized in that, The four-ring conveying structure also includes a four-ring airflow regulating component, which is respectively disposed on the four-ring tangential airflow pipe and the four-ring axial airflow pipe, and is used to adjust the airflow ratio in the three-ring tangential airflow pipe and the three-ring axial airflow pipe.

6. The laboratory-scale small-size swirl pulverized coal burner according to claim 5, characterized in that, The number of the annular tangential airflow pipe and the annular axial airflow pipe are both four. The four annular tangential airflow pipes are evenly distributed along the tangential direction on the outer periphery of the annular conveying pipe inlet, and the four axial airflow pipes are evenly distributed along the circumferential direction above the annular conveying pipe inlet. The number of the two annular tangential airflow pipes and the two annular axial airflow pipes are both four. The four annular axial airflow pipes are evenly distributed radially on the periphery of the inlet of the two annular conveying pipe, and the four annular tangential airflow pipes are evenly distributed tangentially on the outer periphery of the inlet of the two annular conveying pipe, and located below the two annular axial airflow pipes. The number of the three-dimensional annular tangential airflow pipe and the three-dimensional annular axial airflow pipe are both four. The four three-dimensional annular axial airflow pipes are evenly distributed radially on the periphery of the inlet of the three-dimensional annular conveying pipe, and the four three-dimensional annular tangential airflow pipes are evenly distributed tangentially on the outer periphery of the inlet of the three-dimensional annular conveying pipe, and located below the three-dimensional annular axial airflow pipe. The number of the four annular tangential airflow pipes and the four annular axial airflow pipes are both four. The four annular axial airflow pipes are evenly distributed radially on the periphery of the inlet of the four annular conveying pipe, and the four annular tangential airflow pipes are evenly distributed tangentially on the outer periphery of the inlet of the four annular conveying pipe, and located below the four annular axial airflow pipes.

7. A small-sized cyclone pulverized coal burner for laboratory use, characterized in that, include: A pulverized coal gas flow pipe, wherein the pulverized coal gas flow pipe has a central channel for conveying pulverized coal gas flow and an inlet end and an outlet end located at both ends of the central channel; An inertial separation structure is disposed in the pulverized coal gas flow pipe to separate the pulverized coal gas flow in the pulverized coal gas flow pipe into a concentrated pulverized coal gas flow and a diluted pulverized coal gas flow. The inertial separation structure includes an adjustable baffle ring located at the inlet of the pulverized coal gas flow pipe and a guide pipe located downstream of the adjustable baffle ring. The adjustable baffle ring has a first end and a second end with an outer diameter smaller than the first end. One of the first end and the second end faces the inlet of the pulverized coal gas flow pipe, and the other faces the guide pipe. The guide pipe is located in the pulverized coal gas flow pipe and near the outlet of the pulverized coal gas flow pipe, for outputting the pulverized coal gas flow in the adjustable baffle ring. A three-ring conveying structure includes a three-ring conveying pipe, a three-ring tangential airflow pipe, and a three-ring axial airflow pipe. The three-ring conveying pipe is sleeved on the outside of the pulverized coal airflow pipe and forms a three-ring channel with the pulverized coal airflow pipe. The three-ring tangential airflow pipe and the three-ring axial airflow pipe are connected to the three-ring conveying pipe. The three-ring tangential airflow pipe conveys airflow in the tangential direction, and the three-ring axial airflow pipe conveys airflow in the axial direction. Both the three-ring tangential airflow pipe and the three-ring axial airflow pipe are located on the side of the inlet of the three-ring conveying pipe. The three-ring tangential airflow pipe, the three-ring axial airflow pipe, and the three-ring channel are connected. The swirl intensity of the airflow can be adjusted by adjusting the flow rate ratio between the airflows conveyed by the three-ring tangential airflow pipe and the three-ring axial airflow pipe. The four-ring conveying structure includes a four-ring conveying pipe, a four-ring tangential airflow pipe, and a four-ring axial airflow pipe. The four-ring conveying pipe is sleeved on the outside of the three-ring conveying pipe and together with the three-ring conveying pipe to form a four-ring channel. The four-ring tangential airflow pipe and the four-ring axial airflow pipe are connected to the four-ring conveying pipe. The four-ring tangential airflow pipe conveys airflow in the tangential direction, and the four-ring axial airflow pipe conveys airflow in the axial direction. Both the four-ring tangential airflow pipe and the four-ring axial airflow pipe are located on the side of the inlet of the four-ring conveying pipe. The four-ring tangential airflow pipe, the four-ring axial airflow pipe, and the four-ring channel are connected. The swirl intensity of the airflow can be adjusted by adjusting the flow rate ratio between the airflow conveyed by the four-ring tangential airflow pipe and the four-ring axial airflow pipe. The inner walls of both the third and fourth annular channels are streamlined, and both the third and fourth annular channels are gradually narrowing channels from the inlet to the outlet.

8. The laboratory-scale small-size cyclone pulverized coal burner according to claim 7, characterized in that, The inertial separation structure also includes a rotating handle connected to the adjustable baffle ring, used to adjust the adjustable baffle ring so that the first end or the second end faces the inlet of the pulverized coal gas flow pipe.

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