Ammonia-coal mixed combustion pilot test device and method

Abstract

The present invention discloses an ammonia-coal mixed combustion pilot test device and method. The ammonia-coal mixed combustion pilot test device includes a burner, a furnace, an air supply system, a coal powder supply system, and an ammonia supply system. The burner includes a barrel, a cyclone, and a primary air duct. The outlet end of the cyclone is connected to the barrel inlet. The primary air duct is inserted into the cyclone and the outlet end of the primary air duct is placed in the barrel. The side wall of the barrel has a plurality of first sampling ports arranged at intervals. The furnace is connected to the barrel outlet. The furnace has a plurality of second sampling ports arranged at intervals. The air supply system is connected to the burner. The ammonia-coal mixed combustion pilot test device of the embodiment of the present invention can determine the migration path of nitrogen in the combustion process of the ammonia-coal mixed fuel, so as to solve the problem of high nitrogen oxide emissions caused by ammonia-coal mixed combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia-coal mixed combustion, and in particular to an ammonia-coal mixed combustion pilot test device and method. Background Art

[0002] Ammonia, as a zero-carbon fuel, can be directly used as fuel in coal-fired boilers. Compared to traditional fossil fuels, it can significantly reduce CO2 emissions. Under the country's dual carbon goals, ammonia, as a hydrogen carrier, is a new renewable zero-carbon fuel and a high-quality alternative fuel for pulverized coal boilers. Ammonia's low reactivity and high nitrogen content make it difficult to ignite and stabilize combustion, and it also poses high NOx emissions challenges. Therefore, co-firing ammonia with coal is an effective technical approach to reducing CO2 emissions in pulverized coal boilers.

[0003] However, ammonia-coal mixed fuel has the problem of high nitrogen oxide emissions. In order to further study the problem of high nitrogen oxide emissions, it is of great significance to conduct in-depth research on the nitrogen migration path of burning ammonia-coal mixed fuel. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes an ammonia-coal mixed combustion pilot test device to obtain the migration path of nitrogen in the ammonia-coal mixed fuel during combustion.

[0006] The embodiment of the present invention provides a pilot test method for ammonia-coal mixed combustion to obtain the migration path of nitrogen in the ammonia-coal mixed fuel during combustion.

[0007] The ammonia-coal mixed combustion pilot test device of the embodiment of the present invention includes a burner, a furnace, an air supply system, a pulverized coal supply system, and an ammonia supply system. The burner includes a barrel, a cyclone, and a primary air duct. The barrel has a barrel inlet and a barrel outlet opposite to each other along its axial direction. The outlet end of the cyclone is connected to the barrel inlet. The primary air duct is inserted into the cyclone and the outlet end of the primary air duct is placed in the barrel. The side wall of the barrel has multiple first sampling ports arranged at intervals.

[0008] The furnace is in communication with the outlet of the barrel, and the furnace is provided with a plurality of second sampling ports arranged at intervals;

[0009] The air supply system is connected to the burner to provide primary air to the primary air duct and secondary air to the cyclone;

[0010] The pulverized coal supply system and the ammonia supply system are both connected to the primary air duct, so that the primary air carries ammonia and pulverized coal into the primary air duct.

[0011] In some embodiments, the plurality of first sampling ports are divided into a plurality of groups of burner sampling ports, the plurality of groups of burner sampling ports are spaced apart along the axial direction of the cylinder, and each group of burner sampling ports includes a plurality of first sampling ports spaced apart along the circumferential direction of the cylinder.

[0012] In some embodiments, the cylinder is a gradually expanding cone, and the cross-sectional area of ​​the cylinder gradually increases from the cylinder inlet to the cylinder outlet. The diameter of the cylinder inlet is d, and the distance between any two groups of burner sampling ports in the axial direction of the cylinder is 0.5d.

[0013] In some embodiments, the plurality of groups of burner sampling ports include a first group of burner sampling ports, which is arranged closer to the barrel inlet than other groups of burner sampling ports, and the distance between the first group of burner sampling ports and the barrel inlet is 0.5d.

[0014] In some embodiments, a plurality of the second sampling ports are spaced apart along the length direction of the furnace.

[0015] In some embodiments, the diameter of the barrel outlet is D, and the multiple second sampling ports include a first part and a second part. The first part is arranged closer to the barrel outlet than the second part in the length direction of the furnace. The first part and the second part both include multiple second sampling ports. The spacing distance between any two second sampling ports in the first part is 0.5D, and the spacing distance between any two second sampling ports in the second part is D.

[0016] In some embodiments, the first portion is spaced apart from the barrel outlet at a distance of 0.5D in the longitudinal direction of the furnace; and / or

[0017] The first portion and the second portion are spaced apart by a distance D in the length direction of the furnace.

[0018] In some embodiments, the ammonia-coal mixed combustion pilot test device of the embodiment of the present invention further includes a high-speed camera. The furnace has a camera port, and the high-speed camera captures the flame ejected from the cylinder outlet through the camera port.

[0019] In some embodiments, the burner further includes a reflux cap, which is located in the cylinder and disposed at the outlet end of the primary air duct.

[0020] The ammonia-coal mixed combustion pilot test method according to an embodiment of the present invention is based on the ammonia-coal mixed combustion pilot test device described in any of the above embodiments, and includes:

[0021] Using a temperature measuring instrument, measure the temperature in the burner through each of the first sampling ports, and measure the temperature in the furnace through each of the second sampling ports;

[0022] A water-cooled sampling device is used to quench and sample the flue gas and coal coke in the burner through each of the first sampling ports, and to quench and sample the flue gas and coal coke in the furnace through each of the second sampling ports. A flue gas analyzer is used to analyze the gas components in the flue gas sampled from the burner and the furnace, and the concentration and physicochemical structure of the sampled coal coke are analyzed.

[0023] During the test process, the ammonia-coal mixed combustion pilot test device of the embodiment of the present invention can use a temperature measuring instrument to measure the flue gas temperature within the burner and furnace through the first and second sampling ports, and perform radiation correction to obtain the temperature field at each measuring point within the burner and furnace. The flue gas and coal char within the burner and furnace are quenched and sampled through the first and second sampling ports, and the gas components of the flue gas are measured. The coal char concentration and physicochemical structure of the collected high-temperature coal char are analyzed to obtain the gas components, coal char concentration, and physicochemical structure of the coal char at each measuring point within the burner and furnace.

[0024] The aforementioned parameters, including temperature field, gas composition, char concentration, and char chemical structure, need to be measured under different ammonia-coal blending ratios and secondary air swirl intensities. A comprehensive analysis of the measured key factor data and the obtained char chemical characteristics reveals the relationships between burner and furnace temperature, gas composition, ammonia blending ratio, char concentration, and char chemical structure, as well as the ammonia-coal blending ratio and secondary air swirl intensity. This, in turn, reveals the influence of nitrogen migration paths in ammonia-coal mixed fuels.

[0025] Therefore, the ammonia-coal mixed combustion pilot test device of the embodiment of the present invention can determine the migration path of nitrogen in the combustion process of the ammonia-coal mixed fuel, so as to solve the problem of high nitrogen oxide emissions caused by ammonia-coal mixed combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an ammonia-coal mixed combustion pilot test device according to an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of the arrangement of the first sampling point on the burner of the ammonia-coal mixed combustion pilot test device according to an embodiment of the present invention.

[0028] Figure 3 Schematic diagram of the arrangement of the second sampling point on the furnace of the ammonia-coal mixed combustion pilot test device according to an embodiment of the present invention.

[0029] Figure 4Schematic diagram of the arrangement of measuring points on the furnace of the ammonia-coal mixed combustion pilot test device according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] Ammonia-coal mixed combustion pilot test device 100;

[0032] Burner 1; cylinder 101; cylinder inlet 1011; cylinder outlet 1012; first sampling port 1013; cyclone 102; primary air duct 103; reflux cap 104;

[0033] Furnace 2; second sampling port 201; camera port 202;

[0034] Air supply system 3; primary air duct 301; secondary air duct 302; Roots blower 303; blower 304;

[0035] Pulverized coal supply system 4; pulverized coal bin 401; feeder 402;

[0036] Ammonia supply system 5; liquid ammonia storage tank 501; evaporator 502;

[0037] High-speed camera 6;

[0038] Flame 7;

[0039] Measuring point 8. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0041] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0042] like Figures 1 to 4 As shown, the ammonia-coal mixed combustion pilot test device 100 of the embodiment of the present invention includes a burner 1, a furnace 2, an air supply system 3, a pulverized coal supply system 4 and an ammonia supply system 5.

[0043] The burner 1 includes a cylinder 101, a cyclone 102 and a primary air duct 103. The cylinder 101 has a cylinder inlet 1011 and a cylinder outlet 1012 opposite to each other along its axial direction. The outlet end of the cyclone 102 is connected to the cylinder inlet 1011. The primary air duct 103 is inserted into the cyclone 102 and the outlet end of the primary air duct 103 is placed in the cylinder 101. The side wall of the cylinder 101 has multiple first sampling ports 1013 arranged at intervals.

[0044] The furnace 2 is connected to the barrel outlet 1012 and has multiple spaced-apart second sampling ports 201. The air supply system 3 is connected to the burner 1 to provide primary air to the primary air duct 103 and secondary air to the cyclone 102. The pulverized coal supply system 4 and the ammonia supply system 5 are both connected to the primary air duct 103, allowing the primary air to carry ammonia and pulverized coal into the primary air duct 103.

[0045] Specifically, if Figures 1 to 3 As shown, the air supply system 3 includes a wind box (not shown), a primary air duct 301, a secondary air duct 302, a Roots blower 303, and a blower 304. The inlet of the primary air duct 301 is connected to the wind box, and the outlet of the primary air duct 301 is connected to the inlet of the primary air duct 103. The Roots blower 303 is installed on the primary air duct 301 to transport the primary air into the primary air duct 103. The inlet of the secondary air duct 302 is connected to the wind box, and the outlet of the secondary air duct 302 is connected to the inlet of the cyclone 102. The blower is installed on the secondary air duct 302 to transport the secondary air into the cylinder 101.

[0046] The pulverized coal supply system 4 includes a pulverized coal bin 401 and a feeder 402 . The pulverized coal bin 401 is connected to the feeder 402 , and the feeder 402 is connected to the primary air duct 301 . The feeder 402 is used to transport the pulverized coal stored in the pulverized coal bin 401 to the primary air duct 103 .

[0047] The ammonia supply system 5 includes a liquid ammonia storage tank 501 and an evaporator 502. The liquid ammonia storage tank 501 is connected to the evaporator 502, which is in turn connected to the primary air duct 301. The liquid ammonia in the liquid ammonia storage tank 501 evaporates in the evaporator 502 to form ammonia gas, which then enters the primary air duct 103 and mixes with the pulverized coal entering the primary air duct 103 to form an ammonia-coal mixed fuel. The primary air carries the ammonia-coal mixed fuel through the primary air duct 103 and enters the burner 1 for combustion. The combustion flame 7, driven by the secondary air, is then ejected into the furnace 2 for combustion.

[0048] It should be noted that the temperature field, gas composition, char concentration and char physical and chemical structure of ammonia-coal mixed fuel during the combustion process all affect the migration path of fuel N.

[0049] During the test process, the ammonia-coal mixed combustion pilot test device 100 of the embodiment of the present invention can use a penetrating high-temperature thermocouple to measure the flue gas temperature within the burner 1 and furnace 2 through the first sampling port 1013 and the second sampling port 201, and perform radiation correction to obtain the temperature field of each measuring point 8 within the burner 1 and furnace 2. A water-cooled sampling gun can be used to quench and sample the flue gas and coal char within the burner 1 and furnace 2 through the first sampling port 1013 and the second sampling port 201. The gas components of the flue gas can be measured using a Fourier infrared flue gas analyzer, and the coal char concentration and physicochemical structure characterization of the high-temperature coal char obtained, such as specific surface area, porosity, industrial analysis, elemental analysis, etc., to obtain the gas components, coal char concentration, and physicochemical structure characterization of the coal char at each measuring point 8 within the burner 1 and furnace 2.

[0050] It is understood that it is necessary to measure the aforementioned parameters, such as the temperature field, gas composition, char concentration, and char chemical structure, under different ammonia-coal blending ratios and secondary air swirl intensity parameters. A comprehensive analysis of the measured key factor data and the obtained char chemical characteristics reveals the relationships between the temperature, gas composition, ammonia blending ratio, char concentration, and char chemical structure within burner 1 and furnace 2, as well as the ammonia-coal blending ratio and secondary air swirl intensity, thereby deriving the influence of nitrogen migration paths in ammonia-coal mixed fuels.

[0051] Therefore, the ammonia-coal mixed combustion pilot test device 100 of the embodiment of the present invention can determine the migration path of nitrogen in the combustion process of the ammonia-coal mixed fuel, so as to solve the problem of high nitrogen oxide emissions caused by ammonia-coal mixed combustion.

[0052] Optionally, the ammonia-coal mixed combustion pilot test device 100 of the embodiment of the present invention further includes a high-speed camera 6 , and a camera port 202 is provided on the furnace 2 , and the high-speed camera 6 captures the flame 7 ejected from the cylinder outlet 1012 through the camera port 202 .

[0053] For example, Figure 1 As shown, a high-speed camera 6 with a shooting speed of 1700fps / s, a pixel size of 5.6μm, and an exposure time of 200μs is used to capture the flame 7 ejected from the outlet of the burner 1 through the camera port 202 opened on the furnace 2. The high-speed camera 6 is used to capture the shape of the flame 7 ejected from the burner 1, and the pulsation, length, brightness, temperature and other characteristics of the flame 7 are obtained with the help of image processing technology to explore the propagation stability mechanism of the ammonia-coal mixed fuel flame 7.

[0054] Optionally, the burner 1 further includes a reflux cap 104 , which is located inside the cylinder 101 and disposed at the outlet end of the primary air duct 103 .

[0055] For example, Figure 1 and Figure 2As shown, the primary air carrying the ammonia-coal mixture flows from the outlet of the primary air duct 103 to the reflux cap 104 and is ejected in the reverse direction through the reflux channel formed between the outer wall of the primary air duct 103 and the reflux cap 104. The ejected primary air and the ammonia-coal mixture mix with the secondary air entering the cylinder 101 from the cyclone 102. Therefore, the provision of the reflux cap 104 can also be used to simulate the ammonia-coal mixed fuel entering the burner 1 in a reverse direct flow manner, making the ammonia-coal mixed combustion pilot test device 100 of the embodiment of the present invention highly versatile.

[0056] In some embodiments, the plurality of first sampling ports 1013 are divided into a plurality of groups of burner sampling ports, which are arranged at intervals along the axial direction of the cylinder 101 , and each group of burner sampling ports includes a plurality of first sampling ports 1013 arranged at intervals along the circumference of the cylinder 101 .

[0057] For example, Figure 2 As shown, the burner 1 has five groups of burner sampling ports, which are spaced apart along the axial direction of the cylinder 101. The five groups of burner sampling ports are sequentially arranged from the first group of burner sampling ports to the fifth group of burner sampling ports along the direction from the cylinder inlet 1011 to the cylinder outlet 1012. The first group of burner sampling ports includes four first sampling ports 1013, the second group of burner sampling ports includes four first sampling ports 1013, the third group of burner sampling ports includes five first sampling ports 1013, the fourth group of burner sampling ports includes six first sampling ports 1013, and the fifth group of burner sampling ports includes seven first sampling ports 1013. By dividing multiple first sampling ports 1013 into multiple groups of burner sampling ports, the multiple groups of burner sampling ports are arranged at intervals along the axial direction of the cylinder 101, and each group of burner sampling ports includes multiple first sampling ports 1013 arranged at intervals along the circumference of the cylinder 101, so that the multiple first sampling ports 1013 are evenly distributed in the axial direction and circumferential direction of the cylinder 101, thereby making the temperature field, gas composition, coal char concentration and coal char physical and chemical structure at different positions of the burner 1 more accurate, which is conducive to improving the accuracy of the measurement of the migration path of the fuel N.

[0058] In some embodiments, the cylinder 101 is a gradually expanding cone, and the cross-sectional area of ​​the cylinder 101 gradually increases from the cylinder inlet 1011 to the cylinder outlet 1012. The diameter of the cylinder inlet 1011 is d, and the axial spacing between any two groups of burner sampling ports in the cylinder 101 is 0.5d.

[0059] For example, Figure 2As shown, the axial spacing distances of the five groups of burner sampling ports on the cylinder 101 are all 0.5d. By adopting the above arrangement, the spacing distances between two adjacent groups of burner sampling ports can be reasonably arranged according to the size of the burner 1, so as to facilitate the reasonable arrangement of the first sampling port 1013 arranged axially on the cylinder 101, which is beneficial to improving the accuracy of the migration path measurement of the fuel N.

[0060] In some embodiments, the multiple groups of burner sampling ports include a first group of burner sampling ports, which is arranged closer to the barrel inlet 1011 than other groups of burner sampling ports. The distance between the first group of burner sampling ports and the barrel inlet 1011 is 0.5d.

[0061] In some embodiments, a plurality of second sampling ports 201 are arranged at intervals along the length direction of the furnace 2 .

[0062] For example, Figure 3 As shown, the number of the second sampling ports 201 is eight, and the eight second sampling ports 201 are arranged at intervals along the length direction of the furnace 2. By arranging the multiple second sampling ports 201 at intervals along the length direction of the furnace 2, the multiple second sampling ports 201 are distributed more evenly in the length direction of the furnace 2, thereby making the measurement of the temperature field, gas composition, coal coke concentration and coal coke physical and chemical structure at different positions of the furnace 2 more accurate, further helping to improve the accuracy of the measurement of the migration path of the fuel N.

[0063] In some embodiments, the diameter of the barrel outlet 1012 is D, and the multiple second sampling ports 201 include a first part and a second part. The first part is arranged closer to the barrel outlet 1012 in the length direction of the furnace 2 relative to the second part. The first part and the second part both include multiple second sampling ports 201. The spacing distance between any two second sampling ports 201 in the first part is 0.5D, and the spacing distance between any two second sampling ports 201 in the second part is D.

[0064] For example, Figure 3As shown, there are eight second sampling ports 201. The first portion includes four second sampling ports 201, and the spacing between the four second sampling ports 201 is 0.5D. The second portion includes four second sampling ports 201, and the spacing between the four second sampling ports 201 is D. It can be understood that since the flame 7 in the burner 1 is ejected from the cylinder outlet 1012, the second sampling ports 201 in the first portion are close to the cylinder outlet 1012. The spacing between the second sampling ports 201 in the first portion is reasonably arranged, and the second sampling ports 201 in the second portion are far away from the cylinder outlet 1012. The spacing between the second sampling ports 201 in the second portion is reasonably arranged, so that the temperature field, gas composition, coal char concentration and coal char physical and chemical structure at different positions in the furnace 2 are measured more accurately, which is conducive to improving the accuracy of the migration path measurement of the fuel N.

[0065] Alternatively, as Figure 4 As shown, at each second sampling port 201 , sampling is performed at a plurality of measurement points 8 evenly spaced in the width direction of the furnace 2 , and the plurality of measurement points 8 form a sampling plane.

[0066] Optionally, the first portion is spaced apart from the barrel outlet 1012 at a distance of 0.5D in the length direction of the furnace 2 .

[0067] Optionally, the distance between the first portion and the second portion in the length direction of the furnace 2 is D.

[0068] For example, Figure 2 As shown, the interval distance between the fourth second sampling hole and the fifth second sampling hole is D.

[0069] The ammonia-coal mixed combustion pilot test method according to an embodiment of the present invention is based on the ammonia-coal mixed combustion pilot test device 100 described in any of the above embodiments, and includes:

[0070] The temperature inside the burner 1 is measured through each first sampling port 1013 , and the temperature inside the furnace 2 is measured through the second sampling port 201 by using a temperature measuring instrument.

[0071] Using a water-cooled sampling device, the flue gas and coal coke in the burner 1 are quenched and sampled through each first sampling port 1013, and the flue gas and coal coke in the furnace 2 are quenched and sampled through each second sampling port 201. The gas components in the flue gas sampled from the burner 1 and the furnace 2 are analyzed using a flue gas analyzer, and the concentration and physical and chemical structure of the sampled coal coke are analyzed.

[0072] Specifically, during the test process, the ammonia-coal mixed combustion pilot test device 100 of the embodiment of the present invention can use a penetrating high-temperature thermocouple to measure the flue gas temperature within the burner 1 and the furnace 2 through the first sampling port 1013 and the second sampling port 201, and perform radiation correction to obtain the temperature field of each measuring point 8 within the burner 1 and the furnace 2. A water-cooled sampling gun can be used to quench and sample the flue gas and coal char within the burner 1 and the furnace 2 through the first sampling port 1013 and the second sampling port 201, and the gas components of the flue gas can be measured using a Fourier infrared flue gas analyzer. The coal char concentration and physicochemical structure characterization of the high-temperature coal char obtained, such as specific surface area, porosity, industrial analysis, elemental analysis, etc., can be performed to obtain the gas components, coal char concentration, and physicochemical structure characterization of the coal char at each measuring point 8 within the burner 1 and the furnace 2.

[0073] It is understood that it is necessary to measure the aforementioned parameters, such as the temperature field, gas composition, char concentration, and char chemical structure, under different ammonia-coal blending ratios and secondary air swirl intensity parameters. A comprehensive analysis of the measured key factor data and the obtained char chemical characteristics reveals the relationships between the temperature, gas composition, ammonia blending ratio, char concentration, and char chemical structure within burner 1 and furnace 2, as well as the ammonia-coal blending ratio and secondary air swirl intensity, thereby deriving the influence of nitrogen migration paths in ammonia-coal mixed fuels.

[0074] Therefore, the pilot test method for ammonia-coal mixed combustion according to the embodiment of the present invention can derive the migration path of nitrogen in the combustion process of ammonia-coal mixed fuel, so as to solve the problem of high nitrogen oxide emissions caused by ammonia-coal mixed combustion.

[0075] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0076] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0077] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0078] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0079] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0080] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A pilot test device for ammonia-coal mixed combustion, characterized in that: include: A burner (1), comprising a barrel (101), a cyclone (102) and a primary air duct (103); the barrel (101) having a barrel inlet (1011) and a barrel outlet (1012) opposite to each other along its axial direction; the outlet end of the cyclone (102) being in communication with the barrel inlet (1011); the primary air duct (103) being inserted into the cyclone (102) and the outlet end of the primary air duct (103) being disposed in the barrel (101); and a plurality of first sampling ports (1013) arranged at intervals are provided on a side wall of the barrel (101); A furnace (2), the furnace (2) being in communication with the barrel outlet (1012), and the furnace (2) having a plurality of second sampling ports (201) arranged at intervals; an air supply system (3), the air supply system (3) being connected to the burner (1) so as to provide primary air to the primary air duct (103) and secondary air to the cyclone (102); as well as A pulverized coal supply system (4) and an ammonia supply system (5), wherein the pulverized coal supply system (4) and the ammonia supply system (5) are both connected to the primary air duct (103), so that the primary air carries ammonia and pulverized coal into the primary air duct (103).

2. The ammonia-coal mixed combustion pilot test device according to claim 1, characterized in that: The plurality of first sampling ports (1013) are divided into a plurality of groups of burner sampling ports, the plurality of groups of burner sampling ports are arranged at intervals along the axial direction of the cylinder (101), and each group of burner sampling ports includes a plurality of first sampling ports (1013) arranged at intervals along the circumference of the cylinder (101).

3. The ammonia-coal mixed combustion pilot test device according to claim 2, characterized in that: The cylinder (101) is in the shape of a gradually expanding cone, and the cross-sectional area of ​​the cylinder (101) gradually increases in the direction from the cylinder inlet (1011) to the cylinder outlet (1012). The diameter of the cylinder inlet (1011) is d, and the spacing distance between any two groups of burner sampling ports in the axial direction of the cylinder (101) is 0.5d.

4. The ammonia-coal mixed combustion pilot test device according to claim 3, characterized in that: The multiple groups of burner sampling ports include a first group of burner sampling ports, which are arranged closer to the barrel inlet (1011) than the other groups of burner sampling ports, and the distance between the first group of burner sampling ports and the barrel inlet (1011) is 0.5d.

5. The ammonia-coal mixed combustion pilot test device according to claim 3, characterized in that: A plurality of the second sampling ports (201) are arranged at intervals along the length direction of the furnace (2).

6. The ammonia-coal mixed combustion pilot test device according to claim 5, characterized in that: The diameter of the barrel outlet (1012) is D, and the plurality of second sampling ports include a first part and a second part, the first part is arranged closer to the barrel outlet (1012) in the length direction of the furnace (2) relative to the second part, the first part and the second part both include a plurality of second sampling ports, the spacing distance between any two of the second sampling ports in the first part is 0.5D, and the spacing distance between any two of the second sampling ports in the second part is D.

7. The ammonia-coal mixed combustion pilot test device according to claim 6, characterized in that: The first portion is spaced apart from the barrel outlet (1012) by a distance of 0.5D in the longitudinal direction of the furnace (2); and / or The first portion and the second portion are spaced apart by a distance D in the length direction of the furnace (2).

8. The ammonia-coal mixed combustion pilot test device according to any one of claims 1 to 7, characterized in that: It also includes a high-speed camera (6). The furnace (2) has a camera port (202), and the high-speed camera (6) photographs the flame (7) ejected from the cylinder outlet (1012) through the camera port (202).

9. The ammonia-coal mixed combustion pilot test device according to any one of claims 1 to 7, characterized in that: The burner (1) further comprises a return cap (104), wherein the return cap (104) is located inside the cylinder (101) and is arranged at the outlet end of the primary air duct (103).

10. An ammonia-coal mixed combustion pilot test method, the method being based on the ammonia-coal mixed combustion pilot test device according to any one of claims 1 to 9, characterized in that: include: Using a temperature measuring instrument, the temperature inside the burner (1) is measured through each of the first sampling ports (1013), and the temperature inside the furnace (2) is measured through each of the second sampling ports (201); A water-cooled sampling device is used to quench and sample the flue gas and coal coke in the burner (1) through each of the first sampling ports (1013), and quench and sample the flue gas and coal coke in the furnace (2) through each of the second sampling ports (201). A flue gas analyzer is used to analyze the gas components in the flue gas sampled from the burner (1) and the furnace (2), and the concentration and physicochemical structure of the sampled coal coke are analyzed.

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