Coal-ammonia blend combustion swirled burner and method

Abstract

The present application belongs to the technical field of coal combustion equipment, and relates to a swirling combustion device and method for coal-ammonia mixed combustion, which comprises a pre-combustion chamber, a combustion chamber, a coal powder pipeline, an ammonia pre-decomposition chamber, an ammonia pre-heating chamber and an ammonia gas supply assembly; a conveying assembly is arranged on a recirculated flue gas pipe and used for conveying high-temperature flue gas generated in the combustion chamber into the ammonia pre-heating chamber to heat ammonia gas. The present application can convey the high-temperature flue gas in the combustion chamber into the ammonia pre-heating chamber to heat the ammonia gas, the heated ammonia gas enters the ammonia pre-decomposition chamber and is decomposed into hydrogen and nitrogen under the action of an ammonia decomposition catalyst, the ignition temperature of the ammonia gas is reduced, normal combustion of the ammonia gas is ensured, and on the basis of the swirling burner, the original tertiary air pipeline of the swirling burner is transformed into the ammonia pre-decomposition chamber, the addition of combustion air is reduced, the original air flow distribution is avoided to be disturbed, the combustion efficiency of the coal powder is improved, the oxygen content is reduced, and the generation and emission of NOx are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal combustion equipment and relates to a swirling combustion device and method for coal mixed with ammonia combustion. BACKGROUND

[0002] Ammonia, as a new type of fuel with zero carbon and rich hydrogen, has the advantages of easy liquefaction, easy storage, mature production and transportation mode, etc. At the same time, ammonia has the potential as a hydrogen carrier, so it can be used as a boiler fuel to reduce CO2 emissions on a large scale. However, ammonia combustion also has some problems, such as high self-ignition temperature, high ignition energy and potential NOx emission risk.

[0003] At present, when ammonia is used as fuel, a separate ammonia burner is usually used to supply ammonia fuel in the form of combustion air into the tertiary air duct of the swirling combustion device. Although this design can achieve ammonia combustion, due to the separate supply of combustion air, on the one hand, the introduction of combustion air will disturb the original air distribution, leading to uneven flow field at the outlet of the burner, affecting the combustion efficiency of the pulverized coal, on the other hand, the separate supply of combustion air makes the oxygen concentration in the combustion area relatively high, creating better oxygen-rich conditions for NOx generation, promoting the generation of NOx, leading to increased NOx emissions and pollution of the atmospheric environment. SUMMARY

[0004] The purpose of the present application is to provide a swirling combustion device and method for coal mixed with ammonia combustion, which can ensure normal combustion of ammonia fuel, improve the combustion efficiency of pulverized coal and reduce NOx emissions.

[0005] To achieve the above purpose, the technical solution provided by the present application is as follows:

[0006] A swirling combustion device for coal mixed with ammonia combustion, comprising a pre-chamber, a combustion chamber is arranged on one side of the pre-chamber, and a pulverized coal pipeline is arranged on the side away from the combustion chamber of the pre-chamber, further comprising:

[0007] An ammonia pre-decomposition chamber is arranged on the side of the pulverized coal pipeline, the ammonia pre-decomposition chamber is in communication with the pre-chamber, and the ammonia pre-decomposition chamber is provided with an ammonia decomposition catalyst;

[0008] An ammonia preheating chamber is arranged on the ammonia pre-decomposition chamber, and the ammonia preheating chamber is in communication with the ammonia pre-decomposition chamber;

[0009] A recirculating flue gas pipe is arranged between the combustion chamber and the ammonia preheating chamber, and the two ends of the recirculating flue gas pipe are in communication with the combustion chamber and the ammonia preheating chamber, respectively;

[0010] An ammonia gas supply assembly is in communication with the ammonia preheating chamber and is used for supplying ammonia gas to the ammonia preheating chamber;

[0011] A conveying assembly is arranged on the recirculation flue gas pipe and used to convey the high-temperature flue gas generated in the combustion chamber to the ammonia preheating chamber for heating the ammonia gas.

[0012] The application also has the characteristics that:

[0013] The ammonia gas supply assembly comprises:

[0014] At least one ammonia gas storage tank, the outlet of which is connected with the first inlet of the ammonia preheating chamber, and the outlet of the ammonia gas storage tank is provided with a first flow control valve.

[0015] The conveying assembly comprises:

[0016] A first fan is arranged between the recirculation flue gas pipe and the ammonia preheating chamber, the inlet of the first fan is connected with the end of the recirculation flue gas pipe, and the outlet of the first fan is connected with the second inlet of the ammonia preheating chamber.

[0017] A second flow control valve is arranged on the recirculation flue gas pipe.

[0018] A secondary air pipe is arranged between the ammonia pre-decomposition chamber and the pulverized coal pipe, the secondary air pipe is communicated with the pre-combustion chamber, a second fan is arranged at the inlet position of the secondary air pipe, the outlet of the second fan is connected with the inlet of the secondary air pipe through a third flow control valve, and the outlet of the second fan is connected with the inlet of the ammonia preheating chamber through a fourth flow control valve.

[0019] A cyclone member is arranged at the position close to the pre-combustion chamber in the ammonia pre-decomposition chamber and the secondary air pipe.

[0020] The ammonia decomposition catalyst is a ruthenium-based catalyst.

[0021] The pre-combustion chamber is horizontally arranged in a cylindrical structure, the inner diameter gradually increases from the pulverized coal pipe to the combustion chamber, the included angle between the inner wall of the pre-combustion chamber and the axis thereof is γ, and γ is 15°-25°.

[0022] A cyclone combustion method for coal mixed with ammonia combustion comprises the following steps:

[0023] The first fan and the second fan are started, the first fan sends the high-temperature flue gas generated in the combustion chamber into the ammonia preheating chamber to heat the ammonia gas therein, and the second fan sends the secondary air into the secondary air pipe.

[0024] The heated ammonia gas enters the ammonia pre-decomposition chamber, part of the ammonia gas is decomposed into hydrogen and nitrogen under the action of the ammonia decomposition catalyst, and finally a mixed gas of ammonia, hydrogen and nitrogen is formed.

[0025] The mixed gas and the secondary air form a cyclone under the action of the corresponding cyclone member and enter the pre-combustion chamber to mix with the pulverized coal in the pulverized coal pipeline, the volatile matter in the pulverized coal and hydrogen gas are preliminarily combusted in the pre-combustion chamber, and the pulverized coal and ammonia gas are pyrolyzed and incompletely combusted in the combustion chamber under the oxygen-deficient environment to generate the high-temperature flue gas of incomplete combustion.

[0026] The temperature of the high-temperature flue gas is 1300-1800 DEG C.

[0027] The oxygen content of the oxygen-deficient environment is 3-10%.

[0028] The coal-ammonia mixed combustion cyclone combustion device and method have the following advantages:

[0029] Firstly, the high-temperature flue gas in the combustion chamber is conveyed into the ammonia preheating chamber to heat the ammonia gas, the heated ammonia gas enters the ammonia pre-decomposition chamber and is decomposed into hydrogen and nitrogen under the action of the ammonia decomposition catalyst, the ignition temperature of the ammonia gas is reduced, the normal combustion of the ammonia gas is ensured, the original tertiary air pipeline of the cyclone burner is transformed into the ammonia pre-decomposition chamber, the addition of the combustion air is reduced, the original air flow distribution is avoided, the combustion efficiency of the pulverized coal is improved, the oxygen content is reduced, and the generation and emission of NOx are reduced.

[0030] Secondly, the high-temperature flue gas in the combustion chamber is introduced into the ammonia preheating chamber to heat the ammonia gas, the heat of the high-temperature flue gas is fully utilized to heat and decompose the ammonia gas, the flue gas after temperature reduction is sprayed into the pre-combustion chamber and the combustion chamber to absorb part of the heat in the pre-combustion chamber and the combustion chamber, the combustion temperature is reduced, the generation of thermal NOx is effectively alleviated, the combustible material can be secondarily combusted due to the recirculation of the high-temperature flue gas, the oxygen concentration in the flue gas is effectively reduced, and the oxygen-rich generation condition of the nitrogen oxide is inhibited.

[0031] Thirdly, the original tertiary air pipeline is transformed into the ammonia pre-decomposition chamber, the combustion chamber is additionally arranged at the end of the cyclone burner, and the recirculation flue gas air pipe is additionally arranged, the overall transformation slightly damages the original structure of the cyclone burner, is easy to realize, and can realize the single combustion of coal or the mixed combustion of coal and ammonia after transformation, and can meet the needs of different actual situations. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a whole structure schematic view of the present application;

[0033] Figure 2 It is a mixing effect schematic view of the incomplete combustion flue gas and the ammonia pre-decomposition gas in the pre-combustion chamber of the present application;

[0034] Figure 3 Figure 1 is a schematic diagram of the overall process of the present application.

[0035] Reference signs:

[0036] 1, coal pipeline; 2, secondary air pipeline; 3, ammonia pre-decomposition chamber; 4, pre-combustion chamber; 5, combustion chamber; 6, ammonia gas storage tank; 7, first flow control valve; 8, first air blower; 9, second flow control valve; 10, second air blower; 11, third flow control valve; 12, fourth flow control valve; 13, cyclone; 14, ammonia pre-heating chamber; 15, recirculation flue gas pipeline. DETAILED DESCRIPTION

[0037] The technical solutions in the present application will be described clearly and exhaustively below in conjunction with the drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, and in addition, in the description of the embodiments of the present application, "multiple" means two or more than two. The following terms "first" "second" are only for the purpose of description, and cannot be understood as implying or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" "second" can explicitly or implicitly include one or more features.

[0038] As Figure 1As shown, the present application provides a swirling combustion device for coal mixed with ammonia combustion, which comprises a pre-chamber 4, an ammonia pre-decomposition chamber 3, an ammonia pre-heating chamber 14, an ammonia gas supply assembly and a conveying assembly. One side of the pre-chamber 4 is provided with a combustion chamber 5, the combustion chamber 5 is communicated with the pre-chamber 4, and the side of the pre-chamber 4 away from the combustion chamber 5 is provided with a pulverized coal pipeline 1, one end of the pulverized coal pipeline 1 is communicated with the pre-chamber 4, and the pulverized coal pipeline 1 is used for supplying pulverized coal into the pre-chamber 4. The side of the pre-chamber 4 away from the pulverized coal pipeline 1 is connected with the combustion chamber 5. The ammonia pre-decomposition chamber 3 is arranged on the side of the pulverized coal pipeline 1 and is arranged around the circumference of the pulverized coal pipeline 1, that is, the ammonia pre-decomposition chamber 3 is a tubular structure and is sleeved on the pulverized coal pipeline 1. The ammonia pre-decomposition chamber 3 is communicated with the pre-chamber 4. The ammonia pre-decomposition chamber 3 is provided with an ammonia decomposition catalyst. The ammonia decomposition catalyst is used for decomposing ammonia gas, so that part of the ammonia gas is decomposed into hydrogen and nitrogen. The ammonia pre-heating chamber 14 is arranged on the ammonia pre-decomposition chamber 3, and the ammonia pre-heating chamber 14 is communicated with the ammonia pre-decomposition chamber 3. The recirculation flue gas pipe 15 is arranged between the combustion chamber 5 and the ammonia pre-heating chamber 14. The two ends of the recirculation flue gas pipe 15 are respectively communicated with the combustion chamber 5 and the ammonia pre-heating chamber 14. The ammonia gas supply assembly is communicated with the ammonia pre-heating chamber 14 and is used for supplying ammonia gas to the ammonia pre-heating chamber 14. The conveying assembly is arranged on the recirculation flue gas pipe 15 and is used for conveying high-temperature flue gas generated in the combustion chamber 5 into the ammonia pre-heating chamber 14 to heat the ammonia gas. After the ammonia gas is heated in the ammonia pre-heating chamber 14, it enters the ammonia pre-decomposition chamber 3. Under the action of the ammonia decomposition catalyst, part of the ammonia gas is decomposed into hydrogen and nitrogen. The mixed gas containing ammonia, hydrogen and nitrogen enters the pre-chamber 4 and is mixed with the pulverized coal. The volatile matter in the pulverized coal and the hydrogen are preliminarily combusted in the pre-chamber 4. The pulverized coal and the ammonia gas are pyrolyzed and incompletely combusted in the combustion chamber 5 in an oxygen-deficient environment, producing high-temperature flue gas of incomplete combustion. At the same time, the coal coke produced by the incomplete combustion of the pulverized coal and the ammonia gas and oxygen are continuously combusted to provide high-temperature conditions for the pre-chamber 4 and the combustion chamber 5, promoting the further combustion of the combustible material. The present application reduces the ignition temperature of ammonia gas by heating the ammonia gas and decomposing it into hydrogen and nitrogen under the action of the ammonia decomposition catalyst, ensuring normal combustion of the ammonia gas. At the same time, by reducing the addition of combustion air, not only the original air flow distribution is avoided, the combustion efficiency of the pulverized coal is improved, but also the content of oxygen is reduced, the generation and emission of NOx are reduced.

[0039] As shown, Figure 1 The ammonia gas supply assembly comprises at least one ammonia gas storage tank 6. The outlet of the ammonia gas storage tank 6 is connected with the first inlet of the ammonia pre-heating chamber 14. The outlet of the ammonia gas storage tank 6 is provided with a first flow control valve 7. The first flow control valve 7 is used for controlling the supply of ammonia gas and the flow of ammonia gas.

[0040] As shown, Figure 1As shown, a recirculating flue gas pipe 15 is provided between the combustion chamber 5 and the ammonia preheating chamber 14. One end of the recirculating flue gas pipe 15 is connected to the combustion chamber 5, and the other end of the recirculating flue gas pipe 15 is connected to the inlet of the first fan 8. The outlet of the first fan 8 is connected to the second inlet of the ammonia preheating chamber 14. A second flow control valve 9 is provided on the recirculating flue gas pipe 15. When the first fan 8 is started, the first fan 8 transports the high-temperature flue gas generated in the combustion chamber 5 into the ammonia preheating chamber 14. The ammonia is heated by the high-temperature flue gas. First, the cooled flue gas is injected into the pre-combustion chamber 4 and the combustion chamber 5 to absorb some of the heat in the pre-combustion chamber 4 and the combustion chamber 5, thereby reducing the combustion temperature and effectively alleviating the generation of thermal nitrogen oxides. Second, the recirculation of high-temperature flue gas allows the combustibles to undergo secondary combustion, effectively reducing the oxygen concentration in the flue gas and inhibiting the oxygen-rich generation conditions of nitrogen oxides.

[0041] like Figure 1 As shown, a secondary air duct 2 is installed between the ammonia pre-decomposition chamber 3 and the pulverized coal pipeline 1. That is, the secondary air duct 2 is sleeved on the pulverized coal pipeline 1, the ammonia pre-decomposition chamber 3 is sleeved on the secondary air duct 2, the secondary air duct 2 is connected to the pre-combustion chamber 4, a second fan 10 is installed at the inlet of the secondary air duct 2, the outlet of the second fan 10 is connected to the inlet of the secondary air duct 2 through a third flow control valve 11, and the outlet of the second fan 10 is connected to the inlet of the ammonia preheating chamber 14 through a fourth flow control valve 12.

[0042] like Figure 1 , Figure 2 As shown, swirling elements 13 are respectively installed in the ammonia pre-decomposition chamber 3 and the secondary air duct 2 near the pre-combustion chamber 4. The swirling elements 13 cause the secondary air in the secondary air duct 2 and the mixed gas in the ammonia pre-decomposition chamber 3 to form a swirling flow when entering the pre-combustion chamber 4, which promotes the mixing of secondary air, mixed gas and pulverized coal.

[0043] like Figure 1 As shown, the ammonia decomposition catalyst is a ruthenium-based catalyst. Ruthenium-based catalysts have advantages such as high catalytic activity, low-temperature reaction performance, high selectivity and good stability in the ammonia decomposition reaction. Ammonia can be decomposed efficiently through the ammonia decomposition catalyst.

[0044] like Figure 1 , Figure 2 As shown, the pre-combustion chamber 4 is a horizontally arranged columnar structure with its inner diameter gradually increasing from the pulverized coal pipe 1 towards the combustion chamber 5. The angle between the inner wall of the pre-combustion chamber 4 and its axis is γ, which is 15° to 25°. The lower limit of the angle (15°) is to ensure sufficient initial mixing of ammonia, air, and pulverized coal to form... Figure 2The gas flow effect shown avoids the flame sticking to the wall causing slagging, the diffusion speed of ammonia gas is slow, the turbulent mixing needs to be enhanced by the inclination angle, and the increase of the inclination angle can prolong the residence time of the fuel, promote the reduction reaction of ammonia gas to NOx, and reduce the content of NOx, but when the angle is too large, the flame is lifted too much, and there is a risk of uneven heat load on the upper part of the pre-chamber 4, therefore, γ is preferably 20°, when the ammonia mixing ratio is 10% to 15%, the NOx emission is reduced from 350 mg / Nm 3 to 80 mg / Nm 3 , and the carbon content of fly ash is stable below 1.5%, which is the best effect.

[0045] As shown in Figure 3 , a coal ammonia mixing combustion cyclone combustion method comprises the following steps:

[0046] Start the first fan 8 and the second fan 10, the first fan 8 sends the high-temperature flue gas generated in the combustion chamber 5 into the ammonia preheating chamber 14 to heat the ammonia gas therein, and the second fan 10 sends the secondary air into the secondary air pipe 2;

[0047] The heated ammonia gas enters the ammonia pre-decomposition chamber 3, under the action of the ammonia decomposition catalyst, part of the ammonia gas is decomposed into hydrogen and nitrogen, and finally forms a mixed gas of ammonia, hydrogen and nitrogen;

[0048] The mixed gas and the secondary air form a cyclone under the action of the corresponding cyclone member 13 and enter the pre-chamber 4, mix with the coal powder entering from the coal powder pipe 1, the volatile matter in the coal powder and hydrogen gas are preliminarily combusted in the pre-chamber 4, and the coal powder and ammonia gas are pyrolyzed and incompletely combusted in the combustion chamber 5 under the oxygen-deficient environment, generating high-temperature flue gas of incomplete combustion.

[0049] Among them, the temperature of the high-temperature flue gas is 1300℃ to 1800℃, and the oxygen content of the oxygen-deficient environment is 3% to 10%.

[0050] Working principle: when the ammonia combustion is mixed, the fourth flow control valve 12 is closed, the first flow control valve 7, the second flow control valve 9 and the third flow control valve 11 are opened, the first fan 8 and the second fan 10 are started, the first fan 8 sends the high-temperature flue gas generated in the combustion chamber 5 into the ammonia preheating chamber 14 to heat the ammonia gas therein, the second fan 10 sends the secondary air into the secondary air pipe 2, the heated ammonia gas enters the ammonia pre-decomposition chamber 3, under the action of the ammonia decomposition catalyst, part of the ammonia gas is decomposed into hydrogen and nitrogen, and finally forms a mixed gas of ammonia, hydrogen and nitrogen, under the action of the corresponding cyclone 13, the mixed gas and the secondary air form a cyclone and enter the pre-combustion chamber 4, mix with the coal powder in the coal powder pipe 1, and the volatile matter in the coal powder and the hydrogen gas are preliminarily combusted in the pre-combustion chamber 4, and the coal powder and the ammonia gas are combusted in the combustion chamber 5 under the oxygen-free environment to produce incomplete combustion high-temperature flue gas, part of the high-temperature flue gas enters the ammonia preheating chamber 14 with the first fan 8, at the same time, the coal coke produced by the incomplete combustion of the coal powder and the ammonia gas, oxygen are combusted to continuously provide high-temperature conditions for the pre-combustion chamber 4 and the combustion chamber 5, and promote the further combustion of the combustible material.

[0051] When the ammonia combustion is not mixed, the first flow control valve 7 and the second flow control valve 9 are closed, the third flow control valve 11 and the fourth flow control valve 12 are opened, and the second fan 10 is started, the ammonia preheating chamber 14 and the ammonia pre-decomposition chamber 3 serve as the tertiary air pipe, and the amount of tertiary air is controlled by the fourth flow control valve 12.

[0052] It can be understood that the present application is described by some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, the features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of protection of the present application.

Claims

1. A coal-ammonia mixed combustion swirled combustion device, comprising a precombustion chamber (4), one side of the precombustion chamber (4) being provided with a combustion chamber (5), and the side of the precombustion chamber (4) away from the combustion chamber (5) being provided with a pulverized coal pipeline (1), characterized in that, Also comprising: an ammonia pre-decomposition chamber (3) arranged at the side of the pulverized coal pipeline (1), the ammonia pre-decomposition chamber (3) being communicated with the pre-combustion chamber (4), the ammonia pre-decomposition chamber (3) being provided with an ammonia decomposition catalyst; an ammonia pre-heating chamber (14) arranged on the ammonia pre-decomposition chamber (3), the ammonia pre-heating chamber (14) being communicated with the ammonia pre-decomposition chamber (3); a recirculation flue gas pipe (15) arranged between the combustion chamber (5) and the ammonia pre-heating chamber (14), the two ends of the recirculation flue gas pipe (15) being communicated with the combustion chamber (5) and the ammonia pre-heating chamber (14) respectively; an ammonia gas supply assembly communicated with the ammonia pre-heating chamber (14) for supplying ammonia gas to the ammonia pre-heating chamber (14); a conveying assembly arranged on the recirculation flue gas pipe (15) for conveying high-temperature flue gas generated in the combustion chamber (5) into the ammonia pre-heating chamber (14) to heat the ammonia gas; the conveying assembly comprising: a first fan (8) arranged between the recirculation flue gas pipe (15) and the ammonia pre-heating chamber (14), the inlet of the first fan (8) being connected with the end of the recirculation flue gas pipe (15), and the outlet of the first fan (8) being connected with the second inlet of the ammonia pre-heating chamber (14); a second flow control valve (9) arranged on the recirculation flue gas pipe (15).

2. The coal-ammonia admixture combustion swirled combustion device according to claim 1, characterized by the ammonia gas supply assembly comprising: at least one ammonia gas storage tank (6), the outlet of the ammonia gas storage tank (6) being connected with the first inlet of the ammonia pre-heating chamber (14), and the outlet of the ammonia gas storage tank (6) being provided with a first flow control valve (7).

3. The coal-ammonia admixture combustion swirled combustion device according to claim 1, characterized by a secondary air pipe (2) is arranged between the ammonia pre-decomposition chamber (3) and the pulverized coal pipeline (1), the secondary air pipe (2) being communicated with the pre-combustion chamber (4), the inlet position of the secondary air pipe (2) being provided with a second fan (10), the outlet of the second fan (10) being connected with the inlet of the secondary air pipe (2) through a third flow control valve (11), and the outlet of the second fan (10) being connected with the inlet of the ammonia pre-heating chamber (14) through a fourth flow control valve (12).

4. The coal-ammonia admixture combustion swirled combustion apparatus according to claim 3, characterized by swirl members (13) are respectively arranged in the ammonia pre-decomposition chamber (3) and the secondary air pipe (2) close to the pre-combustion chamber (4).

5. The coal-ammonia admixture combustion swirled combustion apparatus according to claim 1, characterized by the ammonia decomposition catalyst is a ruthenium-based catalyst.

6. The coal-ammonia admixture combustion swirled combustion apparatus according to claim 1, characterized by The pre-combustion chamber (4) is horizontally arranged in a cylindrical structure, and the inner diameter gradually increases from the pulverized coal pipeline (1) to the combustion chamber (5); the included angle between the inner wall of the pre-combustion chamber (4) and the axis thereof is using the device as claimed in claim 4, comprising the following steps: , and the included angle starting the first fan (8) and the second fan (10), the first fan (8) sending high-temperature flue gas generated in the combustion chamber (5) into the ammonia pre-heating chamber (14) to heat the ammonia gas therein, and the second fan (10) sending secondary air into the secondary air pipe (2); is 15°-25°.

7. A coal-ammonia blended combustion swirling combustion method characterized by, the heated ammonia gas enters the ammonia pre-decomposition chamber (3), and under the action of the ammonia decomposition catalyst, part of the ammonia gas is decomposed into hydrogen and nitrogen, and finally a mixed gas of ammonia, hydrogen and nitrogen is formed; the mixed gas and the secondary air form a swirl under the action of the corresponding swirl member (13) and enter the pre-combustion chamber (4), and are mixed with the pulverized coal entering from the pulverized coal pipeline (1), the volatile components in the pulverized coal and the hydrogen gas are preliminarily combusted in the pre-combustion chamber (4), and the pulverized coal and the ammonia gas are pyrolyzed and incompletely combusted in the combustion chamber (5) under the oxygen-deficient environment to generate high-temperature flue gas of incomplete combustion; the oxygen content of the oxygen-deficient environment is 3% to 10%. ​ ​ 8. The coal-ammonia admixture combustion swirling combustion method according to claim 7, characterized by The high-temperature flue gas has a temperature of 1300-1800℃. The high-temperature flue gas has a temperature of 1300-1800

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