Two-stage flat flame combustion experimental device for ammonia-coal co-combustion and its use method

Abstract

The present invention discloses a two-stage flat flame combustion test apparatus for detecting ammonia-coal co-combustion and a method for using the apparatus. During use, oxygen and nitrogen are introduced into a first pipe as combustion aids, carbon monoxide and methane are introduced into a second pipe as fuels, and then ignited. Ammonia is then sprayed into the combustion plane through a third pipe, coal powder is sprayed into the combustion plane through a fourth pipe, and oxygen and nitrogen are sprayed into the combustion plane through a fifth pipe as combustion aids for the ammonia and coal powder. During the coal powder injection process, the coal powder mixes with ammonia very early in a locally reducing and volatile-rich environment. The coal powder carries ammonia, nitrogen, and the coal-ammonia mixture through an environment that transitions from reducing to oxidizing. This can be well simulated in the two-stage flat flame combustion test apparatus of the present invention, resulting in more accurate test results of the interaction between ammonia and coal co-combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia-coal combustion tests, and in particular to a two-stage flat flame combustion test device for ammonia-coal mixed combustion and a method for using the same. Background Art

[0002] In the context of dual carbon emissions, how to strengthen the clean and efficient use of coal is an urgent issue to be addressed. At the same time, with the development of new energy, coal, as a guaranteed energy source, coal-fired power units need to meet the requirements of safe, stable, and efficient boiler operation under deep peak regulation. Based on this, ammonia is a clean, carbon-free, and high-energy-density fuel. The mixed combustion of pulverized coal and ammonia is an effective way to promote the more efficient, clean, low-carbon, and flexible development of coal-fired power units. It is also an effective measure to solve the stable combustion and burnout of boilers under low-load combustion conditions and promote the organic integration and complementary development of coal-fired power units and new energy. Therefore, conducting ammonia-coal co-combustion experiments on a two-stage flat flame burner to explore its combustion and emission characteristics is crucial to clarifying the interaction between ammonia and coal co-combustion.

[0003] In related technologies, when studying the combustion mechanism and emission characteristics of ammonia-coal, ammonia and pulverized coal are usually mixed and fed simultaneously to study their combustion conditions. However, since ammonia burns more quickly and burns quickly on the burner surface, the ammonia-coal co-combustion in related technologies can be considered to be the interaction between the combustion products of ammonia and pulverized coal, which causes certain deviations in the test results. Summary of the Invention

[0004] The present invention aims to solve, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention provide a two-stage flat flame combustion experimental device with high test accuracy, and embodiments of the present invention provide a method for using the two-stage flat flame combustion experimental device with high test accuracy.

[0005] The two-stage flat flame combustion experimental device for ammonia-coal co-combustion according to the embodiment of the present invention comprises:

[0006] a first cylinder and a second cylinder, wherein the first cylinder is sleeved on the second cylinder, the first cylinder and the second cylinder are spaced apart in the inner and outer directions so as to define an annular cavity between the first cylinder and the second cylinder, the first cylinder having a first port and a second port opposite to each other along its axial direction, the second cylinder having a third port and a fourth port opposite to each other along its axial direction, the first port being arranged closer to the third port in the axial direction of the first cylinder than the fourth port, and the first port being flush with the third port;

[0007] a plurality of first pipes and a plurality of second pipes, wherein the plurality of first pipes and the plurality of second pipes are all disposed in the annular cavity, and the outlet ends of the first pipes and the outlet ends of the second pipes are both flush with the first port;

[0008] a third pipe, a plurality of fourth pipes and a plurality of fifth pipes, wherein the third pipe, the plurality of fourth pipes and the plurality of fifth pipes are all arranged in the second cylinder, and the outlet end of the third pipe, the outlet end of the fourth pipe and the outlet end of the fifth pipe are all flush with the first port.

[0009] In some embodiments, the outlets of the first pipe, the second pipe, the third pipe, the fourth pipe and the fifth pipe are all circular outlets, and the diameter of the circular outlet is d, wherein the inner diameter of the first cylinder is D1, the inner diameter of the second cylinder is D2, the ratio between D1 and D2 is 12-18, and the ratio between d and D2 is 1 / 7-1 / 5.

[0010] In some embodiments, a plurality of the first pipes and a plurality of the second pipes form a plurality of pipe groups, the plurality of the pipe groups are arranged along a first direction, each of the pipe groups includes a plurality of the first pipes and a plurality of the second pipes arranged along a second direction, and the first direction is perpendicular to the second direction.

[0011] In some embodiments, two second pipes are provided between two adjacent first pipes in the pipe group.

[0012] In some embodiments, the third pipe is coaxially arranged with the second cylinder, and a plurality of the fourth pipes are arranged around the third pipe.

[0013] In some embodiments, the two-stage flat flame combustion experimental device for ammonia-coal co-combustion of an embodiment of the present invention also includes a water cooling device, which is arranged on the first cylinder and adjacent to the first port, and the water cooling device has a cooling chamber and a water inlet and a water outlet connected to the cooling chamber.

[0014] In some embodiments, the second port and the fourth port are staggered in the axial direction of the first cylinder, and the fourth port is located outside the first cylinder;

[0015] The two-stage flat flame combustion experimental device also includes a first sealing plate and a second sealing plate, the first sealing plate blocks the second port, the second cylinder is inserted into the first sealing plate, the second sealing plate blocks the fourth port, the third pipe is inserted into the second sealing plate, and the inlet end of the third pipe is placed outside the second cylinder.

[0016] In some embodiments, a first air inlet pipe and a second air inlet pipe are provided on the first cylinder, and multiple first pipes are connected to the first air inlet pipe, and multiple second pipes are connected to the second air inlet pipe. A third air inlet pipe and a fourth air inlet pipe are provided on the second cylinder, and multiple fourth pipes are connected to the third air inlet pipe, and multiple fifth pipes are connected to the fourth air inlet pipe.

[0017] In some embodiments, a first flow regulating valve is provided on the first air intake pipe, and a second flow regulating valve is provided on the second air intake pipe.

[0018] A method for using a two-stage flat flame combustion experimental device for ammonia-coal co-firing according to an embodiment of the present invention, based on the two-stage flat flame combustion experimental device for ammonia-coal co-firing described in any of the above embodiments, comprises:

[0019] Passing oxygen and nitrogen into the first pipe, passing carbon monoxide and methane into the second pipe, and then igniting;

[0020] Ammonia is introduced into the third pipeline, pulverized coal is introduced into the fourth pipeline, and oxygen and nitrogen are introduced into the fifth pipeline.

[0021] Specifically, during use of the two-stage flat flame combustion experimental apparatus according to an embodiment of the present invention, oxygen and nitrogen as combustion aids are introduced into a first pipe, carbon monoxide and methane as fuel are introduced into a second pipe, and then ignited, causing the fuel to burn on the outer honeycomb under the action of the combustion aids. Ammonia is then injected into the combustion plane through a third pipe, pulverized coal is injected into the combustion plane through a fourth pipe, and oxygen and nitrogen as combustion aids for the ammonia and pulverized coal are injected into the combustion plane through a fifth pipe.

[0022] It should be noted that during the coal powder injection process, the coal powder is mixed with ammonia very early in an environment of local reduction and rich in volatile substances. The coal powder carries ammonia, nitrogen N and the coal-ammonia mixture and experiences an environment from reduction to oxidation, which can be well simulated on the two-stage flat flame combustion experimental device of the embodiment of the present invention. Compared with the simultaneous mixing and feeding of ammonia and coal powder in the related art, it can effectively avoid the interaction between the combustion products of ammonia and the combustion of coal powder due to the rapid combustion of ammonia, so that the test results of the interaction of ammonia-coal co-combustion are more accurate.

[0023] Therefore, the two-stage flat flame combustion experimental device of the embodiment of the present invention has the advantages of high accuracy of ammonia-coal co-combustion test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of a two-stage flat flame combustion experimental device according to an embodiment of the present invention.

[0025] Figure 2 It is a schematic top view of the structure of a two-stage flat flame combustion experimental device according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Two-stage flat flame combustion experimental device 100;

[0028] First cylinder 1; first port 101; second port 102;

[0029] Second cylinder 2; third port 201; fourth port 202;

[0030] annular cavity 3;

[0031] First pipeline 401; second pipeline 402; third pipeline 403; fourth pipeline 404; fifth pipeline 405;

[0032] First air inlet pipe 501; second air inlet pipe 502; third air inlet pipe 503; fourth air inlet pipe 504;

[0033] First flow regulating valve 601; second flow regulating valve 602;

[0034] First sealing plate 701; second sealing plate 702;

[0035] Water cooling device 8; cooling chamber 801; water inlet 802; water outlet 803. DETAILED DESCRIPTION

[0036] 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.

[0037] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0038] like Figure 1 and Figure 2 As shown, the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention includes a first cylinder 1, a second cylinder 2, a plurality of first pipes 401, a plurality of second pipes 402, a third pipe 403, a plurality of fourth pipes 404 and a plurality of fifth pipes 405.

[0039] The first cylindrical body 1 is sleeved on the second cylindrical body 2, and the first cylindrical body 1 and the second cylindrical body 2 are spaced apart in the inward and outward directions so as to define an annular cavity 3 between the first cylindrical body 1 and the second cylindrical body 2. The first cylindrical body 1 has a first port 101 and a second port 102 that are opposite to each other along its axial direction, and the second cylindrical body 2 has a third port 201 and a fourth port 202 that are opposite to each other along its axial direction. The first port 101 is arranged closer to the third port 201 in the axial direction of the first cylindrical body 1 than the fourth port 202, and the first port 101 is flush with the third port 201.

[0040] The plurality of first pipes 401 and the plurality of second pipes 402 are all disposed in the annular cavity 3 , and the outlet ends of the first pipes 401 and the outlet ends of the second pipes 402 are both flush with the first port 101 .

[0041] The third pipe 403, the plurality of fourth pipes 404 and the plurality of fifth pipes 405 are all arranged in the second cylinder 2, and the outlet end of the third pipe 403, the outlet end of the fourth pipe 404 and the outlet end of the fifth pipe 405 are all flush with the first port 101, wherein the first pipe 401 to the fifth pipe 405 can be made of stainless steel pipes.

[0042] The two-stage flat flame combustion experimental device 100 of an embodiment of the present invention is configured such that a plurality of first pipes 401 and a plurality of second pipes 402 are arranged in an annular cavity 3, and the outlet ends of the first pipes 401 and the second pipes 402 are all flush with the first port 101, and the outlet ends of the third pipe 403, the plurality of fourth pipes 404 and the plurality of fifth pipes 405 are all arranged flush with the first port 101, so that the plurality of gas pipes can form a honeycomb-like combustion plane, and this combustion plane is separated into an inner honeycomb and an outer honeycomb by the second cylinder 2, thereby forming a two-stage flat flame burner.

[0043] Specifically, during use of the two-stage flat flame combustion experimental apparatus 100 according to an embodiment of the present invention, oxygen and nitrogen as combustion aids are introduced into the first pipe 401, carbon monoxide and methane as fuel are introduced into the second pipe 402, and then ignited, causing the fuel to burn on the outer honeycomb under the action of the combustion aids. Ammonia is then injected into the combustion plane through the third pipe 403, pulverized coal is injected into the combustion plane through the fourth pipe 404, and oxygen and nitrogen as combustion aids for the ammonia and pulverized coal are injected into the combustion plane through the fifth pipe 405.

[0044] It should be noted that during the coal powder injection process, the coal powder is mixed with ammonia very early in an environment of local reduction and rich in volatile substances. The coal powder carries ammonia, nitrogen N2 and the coal-ammonia mixture and experiences an environment from reduction to oxidation, which can be well simulated on the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention. Compared with the simultaneous mixing and feeding of ammonia and coal powder in the related art, it can effectively avoid the interaction between the combustion products of ammonia and the combustion of coal powder due to the rapid combustion of ammonia, so that the test results of the interaction between ammonia and coal co-combustion are more accurate.

[0045] Therefore, the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention has the advantages of high accuracy of ammonia-coal co-combustion test results.

[0046] In some embodiments, the outlets of the first pipe 401, the second pipe 402, the third pipe 403, the fourth pipe 404 and the fifth pipe 405 are all circular outlets with a diameter of d, wherein the inner diameter of the first cylinder 1 is D1, the inner diameter of the second cylinder 2 is D2, the ratio between D1 and D2 is 12-18, and the ratio between d and D2 is 1 / 7-1 / 5.

[0047] For example, the ratio between D1 and D2 is 15, the ratio between d and D2 is 1 / 6, D1 is 80 mm, D2 is 6 mm, and d is 1 mm. By properly arranging the ratio between D1 and D2 and the ratio between d and D2, the structure of the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention is reasonably designed.

[0048] In some embodiments, multiple first pipes 401 and multiple second pipes 402 form multiple pipe groups, and the multiple pipe groups are arranged along the first direction. Each pipe group includes multiple first pipes 401 and multiple second pipes 402 arranged along the second direction, and the first direction is perpendicular to the second direction.

[0049] For example, Figure 2 As shown, the two-stage flat flame combustion experimental apparatus 100 according to the embodiment of the present invention forms a plurality of pipe groups by combining a plurality of first pipes 401 and a plurality of second pipes 402. The plurality of pipe groups are arranged along a first direction, and each pipe group includes a plurality of first pipes 401 and a plurality of second pipes 402 arranged along a second direction. This allows the first pipes 401 and the second pipes 402 to be arranged in both the first and second directions, thereby ensuring that the first pipes 401 and the second pipes 402 are evenly distributed within the annular cavity 3. When the combustion-supporting agent ejected from the first pipes 401 and the fuel ejected from the second pipes 402 are evenly distributed on the combustion plane, this facilitates the full combustion of the ammonia coal on the combustion plane, further facilitating improved test accuracy of the two-stage flat flame combustion experimental apparatus 100 according to the embodiment of the present invention.

[0050] In some embodiments, two second pipes 402 are provided between two adjacent first pipes 401 in the pipe group.

[0051] That is to say, in the first direction, the first pipe 401 and the second pipe 402 are inserted into the outer honeycomb with a tube hole ratio of 1:2, so that the injection range of the combustion-supporting agent sprayed by the first pipe 401 and the injection range of the fuel sprayed by the second pipe 402 are reasonably arranged, which is conducive to the full combination and combustion of the fuel and the combustion-supporting agent on the combustion plane, thereby further helping to improve the test accuracy of the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention.

[0052] In some embodiments, the third pipe 403 is coaxially arranged with the second cylinder 2 , and the plurality of fourth pipes 404 are arranged around the third pipe 403 .

[0053] For example, Figure 2 As shown, since the third pipe 403 is used for passing ammonia and the fourth pipe 404 is used for passing coal powder, by arranging multiple fourth pipes 404 around the third pipe 403, the multiple fourth pipes 404 can surround the third pipe 403, so that the coal powder sprayed out of the multiple fourth pipes 404 forms a barrier, so that the ammonia sprayed out of the third pipe 403 is isolated from the combustion flame in the outer honeycomb area, preventing the ammonia from contacting and burning with the combustion flame in the outer honeycomb area too early, and then making the ammonia-coal mixture experience an environment from reduction to oxidation, further making the ammonia-coal mixed combustion can be well simulated on the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention, further helping to improve the accuracy of the test results.

[0054] In some embodiments, the water cooling device 8 of the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention is arranged on the first cylinder 1 and is arranged near the first port 101. The water cooling device 8 has a cooling chamber 801 and a water inlet 802 and a water outlet 803 connected to the cooling chamber 801.

[0055] For example, Figure 1 and Figure 2 As shown, a water cooling device 8 is provided at one end of the first cylinder 1 close to the combustion plane. The water cooling device 8 is provided around the first cylinder 1. During the test, circulating water can enter the cooling chamber 801 through the water inlet 802, exchange heat with the first cylinder 1, and then be discharged through the water outlet 803 to cool the first cylinder 1 and the second cylinder 2. It can be understood that since the temperature of the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention can reach 1200°C during the combustion process, the provision of the water cooling device 8 can effectively prevent the two-stage flat flame burner experimental device 100 from being damaged due to excessive temperature, which is conducive to improving the working reliability of the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention.

[0056] In some embodiments, the second port 102 and the fourth port 202 are staggered in the axial direction of the first cylinder 1, and the fourth port 202 is located outside the first cylinder 1. The two-stage flat flame combustion experimental device 100 of the embodiment of the present invention further includes a first sealing plate 701 and a second sealing plate 702. The first sealing plate 701 blocks the second port 102, and the second cylinder 2 is inserted into the first sealing plate 701. The second sealing plate 702 blocks the fourth port 202. The third pipe 403 is inserted into the second sealing plate 702, and the inlet end of the third pipe 403 is located outside the second cylinder 2.

[0057] like Figure 1 As shown, the second cylinder 2 can be mounted on the first sealing plate 701 by flange connection or welding connection, thereby making the structure simple and the connection between the first cylinder 1 and the second cylinder 2 convenient. The third pipe 403 can be mounted on the second sealing plate 702 by flange connection or welding connection, thereby making the structure simple and the connection between the second cylinder 2 and the third pipe 403 convenient.

[0058] In some embodiments, a first air inlet pipe 501 and a second air inlet pipe 502 are provided on the first cylinder 1, multiple first pipes 401 are connected to the first air inlet pipe 501, multiple second pipes 402 are connected to the second air inlet pipe 502, a third air inlet pipe 503 and a fourth air inlet pipe 504 are provided on the second cylinder 2, multiple fourth pipes 404 are connected to the third air inlet pipe 503, and multiple fifth pipes 405 are connected to the fourth air inlet pipe 504.

[0059] For example, Figure 1 As shown, there are two first air inlet pipes 501, which are arranged opposite each other. A portion of the first pipe 401 is connected to one first air inlet pipe 501, and another portion of the first pipe 401 is connected to the other first air inlet pipe 501. There are two second air inlet pipes 502, which are arranged opposite each other. A portion of the second pipe 402 is connected to one second air inlet pipe 502, and another portion of the second pipe 402 is connected to the other second air inlet pipe 502. Two third air inlet pipes 503 are arranged opposite each other. A portion of the fourth pipe 404 is connected to one third air inlet pipe 503, and another portion of the fourth pipe 404 is connected to the other third air inlet pipe 503. Two fourth air inlet pipes 504 are arranged opposite each other. A portion of the fifth pipe 405 is connected to one fourth air inlet pipe 504, and another portion of the fifth pipe 405 is connected to the other fourth air inlet pipe 504.

[0060] Therefore, the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention is convenient for feeding materials to multiple first pipes 401, multiple second pipes 402, multiple fourth pipes 404 and multiple fifth pipes 405 by setting the first air inlet pipe 501, the second air inlet pipe 502, the third air inlet pipe 503 and the fourth air inlet pipe 504, thereby making the structure simple and easy to operate.

[0061] Optionally, a first flow regulating valve 601 is provided on the first air inlet pipe 501 , and a second flow regulating valve 602 is provided on the second air inlet pipe 502 .

[0062] The two-stage flat flame combustion experimental device 100 of the embodiment of the present invention adjusts the flow rate of oxygen and nitrogen entering the first air inlet pipe 501 by adjusting the first flow regulating valve 601, and adjusts the flow rate of carbon monoxide and methane entering the second air inlet pipe 502 by adjusting the second flow regulating valve 602, thereby controlling the temperature, oxygen proportion and gas velocity of the combustion flame respectively, so that the two-stage flat flame combustion experimental device 100 of the embodiment of the present invention can simulate different combustion conditions for testing, which is further conducive to improving the accuracy of the test results.

[0063] The method for using the two-stage flat flame combustion experimental device 100 for ammonia-coal co-combustion according to an embodiment of the present invention is based on the two-stage flat flame combustion experimental device 100 for ammonia-coal co-combustion according to any of the above embodiments, and includes:

[0064] Oxygen and nitrogen are introduced into the first pipe 401, carbon monoxide and methane are introduced into the second pipe 402, and then ignited;

[0065] Ammonia is introduced into the third pipeline 403 , pulverized coal is introduced into the fourth pipeline 404 , and oxygen and nitrogen are introduced into the fifth pipeline 405 .

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 method for using a two-stage flat flame combustion experimental device for ammonia-coal co-combustion, characterized in that: The two-stage flat flame combustion experimental device comprises: A first cylinder (1) and a second cylinder (2), wherein the first cylinder (1) is sleeved on the second cylinder (2), the first cylinder (1) and the second cylinder (2) are spaced apart in the inner and outer directions so that an annular cavity (3) is defined between the first cylinder (1) and the second cylinder (2), the first cylinder (1) having a first port (101) and a second port (102) opposite to each other along its axial direction, the second cylinder (2) having a third port (201) and a fourth port (202) opposite to each other along its axial direction, the first port (101) being arranged closer to the third port (201) in the axial direction of the first cylinder (1) relative to the fourth port (202), and the first port (101) being flush with the third port (201); a plurality of first pipes (401) and a plurality of second pipes (402), wherein the plurality of first pipes (401) and the plurality of second pipes (402) are all arranged in the annular cavity (3), and the outlet ends of the first pipes (401) and the outlet ends of the second pipes (402) are both flush with the first port (101); and a third pipe (403), a plurality of fourth pipes (404) and a plurality of fifth pipes (405), wherein the third pipe (403), the plurality of fourth pipes (404) and the plurality of fifth pipes (405) are all arranged in the second cylinder (2), the outlet end of the third pipe (403), the outlet end of the fourth pipe (404) and the outlet end of the fifth pipe (405) are all flush with the first port (101), the third pipe (403) is used for passing ammonia gas, the fourth pipe (404) is used for passing pulverized coal, and the plurality of fourth pipes (404) are arranged around the third pipe (403), so that the plurality of fourth pipes (404) surround the third pipe (403), so that the pulverized coal ejected from the plurality of fourth pipes (404) forms a barrier, so that the ammonia gas ejected from the third pipe (403) is isolated from the combustion flame in the outer honeycomb area; The method of use includes: Passing oxygen and nitrogen into the first pipe (401), passing carbon monoxide and methane into the second pipe (402), and then igniting; Ammonia is introduced into the third pipeline (403), pulverized coal is introduced into the fourth pipeline (404), and oxygen and nitrogen are introduced into the fifth pipeline (405).

2. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to claim 1, characterized in that: The outlets of the first pipe (401), the second pipe (402), the third pipe (403), the fourth pipe (404) and the fifth pipe (405) are all circular outlets, and the diameter of the circular outlet is d; The inner diameter of the first cylinder (1) is D1, the inner diameter of the second cylinder (2) is D2, the ratio between D1 and D2 is 12-18, and the ratio between d and D2 is 1 / 7-1 / 5.

3. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to claim 2, characterized in that: A plurality of the first pipes (401) and a plurality of the second pipes (402) form a plurality of pipe groups, the plurality of the pipe groups are arranged along a first direction, each of the pipe groups comprises a plurality of the first pipes (401) and a plurality of the second pipes (402) arranged along a second direction, the first direction being perpendicular to the second direction.

4. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to claim 3, characterized in that: Two second pipes (402) are provided between two adjacent first pipes (401) in the pipe group.

5. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to claim 1, characterized in that: The third pipe (403) is coaxially arranged with the second cylinder (2).

6. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to claim 1, characterized in that: It also includes a water cooling device (8), which is arranged on the first cylinder (1) and adjacent to the first port (101), and has a cooling chamber (801) and a water inlet (802) and a water outlet (803) in communication with the cooling chamber (801).

7. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to any one of claims 1 to 6, characterized in that: The second port (102) and the fourth port (202) are staggered in the axial direction of the first cylinder (1), and the fourth port (202) is located outside the first cylinder (1); The two-stage flat flame combustion experimental device further includes a first sealing plate (701) and a second sealing plate (702), wherein the first sealing plate (701) blocks the second port (102), the second cylinder (2) is inserted into the first sealing plate (701), the second sealing plate (702) blocks the fourth port (202), the third pipe (403) is inserted into the second sealing plate (702), and the inlet end of the third pipe (403) is placed outside the second cylinder (2).

8. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to claim 7, characterized in that: The first cylinder (1) is provided with a first air inlet pipe (501) and a second air inlet pipe (502), a plurality of the first pipes (401) are all in communication with the first air inlet pipe (501), a plurality of the second pipes (402) are all in communication with the second air inlet pipe (502), a third air inlet pipe (503) and a fourth air inlet pipe (504) are provided on the second cylinder (2), a plurality of the fourth pipes (404) are all in communication with the third air inlet pipe (503), and a plurality of the fifth pipes (405) are all in communication with the fourth air inlet pipe (504).

9. The method for using the two-stage flat flame combustion experimental device for ammonia-coal co-firing according to claim 8, characterized in that: The first air inlet pipe (501) is provided with a first flow regulating valve (601), and the second air inlet pipe (502) is provided with a second flow regulating valve (602).

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