CN115059917A - A high-speed multiphase jet burner with constriction section - Google Patents

Abstract

The invention discloses a high-speed multiphase jet combustor with a contraction section, and belongs to the field of combustors. The invention comprises an upper cover, a gasket, a contraction cavity, a burner frame and a base. The burner frame is composed of an outer frame, a rectifying medium and a porous medium. The lean premixed gas is introduced from a gas flow inlet on the outer frame and flows through the rectification medium and the porous medium to form stable radial jet flows uniformly distributed on the periphery in the combustor; the fuel jet of gas-solid mixture is introduced from an axial jet inlet on the base; the contraction cavity is used as a contraction section of the combustor. High-temperature multi-phase fuel gas generated after the radial jet flow and the axial jet flow are combusted in the combustor is accelerated by the contraction section and then is discharged from the combustor. The annular cavity is used as a water-cooling flow channel of the combustor to cool the contraction cavity. The invention can realize the rapid mixing and the efficient combustion of gas-phase and solid-phase fuels, has good adjustable controllability, can achieve the purposes of pollution reduction and emission reduction, and can generate high-speed multiphase fuel gas jet flow.

Description

A high-speed multiphase jet burner with constriction section

technical field

The invention relates to a high-speed multiphase jet burner with a constriction section, belonging to the field of burners.

Background technique

Due to the high velocity of the high-speed jet flame itself, the residence time of the fuel is limited, and the high-pressure area generated by the combustion reaction inside the high-speed flame makes it difficult for the fuel to fully burn and the combustion efficiency is not high. Compared with gaseous and liquid fuels, pulverized fuels have a more prominent problem of low combustion efficiency in high-velocity jet flames.

At present, the common method to improve the combustion efficiency of the high-speed jet flame is to arrange the accompanying combustion flame in the same direction as the high-speed jet flame around the high-speed jet flame, so as to isolate the high-speed jet flame from the external cold air to reduce the heat loss of the high-speed jet flame, thereby reducing the heat loss of the high-speed jet flame. Improve the temperature and combustion efficiency of high-speed jet flame. However, under the ejection of the central high-speed jet flame, the surrounding accompanying flames will gather towards the central high-speed jet flame, so that the accompanying flame can only cover a part of the lower part of the high-speed jet flame, so that the accompanying combustion flame can affect the high-speed jet. The improvement of flame combustion efficiency is limited.

Typical staged burners include axial staged combustion in which the main combustion zone, reburning zone and burnout zone are arranged in sequence in the vertical direction; there are also radial staged combustion methods, such as the formation of primary air pulverized coal airflow in the furnace. Double tangent circular combustion method with inner and secondary air outside. Part of the NO _X generated in the main combustion zone is reduced to N ₂ in the re-burning zone; the fuel burnout degree, the temperature of the re-burning zone, the amount of secondary fuel and the way of air flow and fuel feeding in the main combustion zone all affect the combustion of the fuel. Efficiency and _NOx emissions have an effect; the higher the temperature in the reburn zone, the more pronounced the effect of reducing _NOx emissions. The double tangent circular radial staging combustion method can further improve the effect of pollution reduction and emission reduction, but there are problems such as large deviation of combustion temperature in the furnace and easy coking in the furnace.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-speed multi-phase jet burner with a constricted section, which can realize rapid mixing and efficient combustion of gas phase and solid phase fuels, has good controllability, and can also achieve pollution reduction and emission reduction. purpose, and can generate high-speed multiphase gas jet.

The purpose of this invention is to realize through following technical scheme:

The invention discloses a high-speed multiphase jet burner with a constriction section, comprising an upper cover, a gasket, a constriction cavity, a burner frame and a base. The burner frame is composed of an outer frame, a rectifying medium and a porous medium; a plurality of air inlets are arranged around the outer frame for introducing premixed lean gas; the porous medium is provided with a plurality of radially parallel air inlets. There is a gap between the outer frame and the porous medium to form an annular chamber; the rectifying medium is placed in the annular chamber, fixedly installed on the porous medium, and is passed through the airflow inlets around the outer frame. The lean-burned premixed gas first diffuses in the annular chamber between the outer frame and the rectifying medium, and then passes through the rectifying medium and the porous medium to form a uniformly distributed and stable radial direction in the combustion chamber that points to the axis of the combustion chamber. jet. A base is installed below the burner frame, and a shrinkage cavity and an upper cover are installed above. Gaskets are installed between the base and the burner frame, the burner frame and the shrinking cavity, and the shrinking cavity and the upper cover. The inner chamber formed by the base, the porous medium and the shrinking chamber constitutes the combustion chamber of the burner. The base is provided with an axial jet inlet, which can introduce multiphase fuel jets into the burner. Since the inner diameter of the combustion chamber (that is, the inner diameter of the annular porous medium) is larger than the inner diameter of the axial fuel jet inlet, the axial fuel jet slows down after entering the combustion chamber, and the residence time increases. The cross section of the inner cavity of the shrinkage cavity is circular, the end with the larger inner diameter is equal to the inner diameter of the annular porous medium, the inner diameter of the shrinkage cavity gradually shrinks and transitions smoothly, and the end with the smaller inner diameter serves as the gas outlet of the burner, The constriction cavity is the constriction section of the burner. The shrinking cavity is provided with a groove, which forms an annular cavity after being sealed with the upper cover; a cooling water inlet and outlet are provided outside the shrinking cavity, and cooling water can be injected into the annular cavity, and the annular cavity is used as the water-cooled flow passage of the burner to shrink the cavity. The cavity is cooled.

Preferably, the base is in the shape of a boss, which can be matched with an annular porous medium to improve the coaxiality between the jet inlet on the base and the combustion chamber.

Preferably, the outer profile of the cross-section of the outer frame is square, and the inner profile is circular.

Preferably, the number of airflows arranged around the outer frame is 4, which are evenly distributed around the outer frame and point to the central axis of the combustion chamber.

Preferably, each of the cooling water inlets and outlets provided on the shrinkage cavity is one.

Preferably, the outer frame, the base, the shrinking cavity and the upper cover can be fixed with fastening bolts through bolt holes evenly distributed around, and gaskets are installed between them to ensure sealing.

The working method of a high-speed multi-phase jet burner with a constriction section disclosed by the present invention is as follows: lean-burning premixed gas is introduced from the air inlets around the outer frame, and the premixed gas first circulates in a ring shape between the outer frame and the rectifying medium. Diffusion in the chamber, after passing through the rectifying medium and the porous medium, a radial jet that is uniformly distributed from outside to inside and around is formed in the combustion chamber. After the radial jet is ignited, a gas-phase tubular flame is formed in the combustion chamber, the axis of the tubular flame coincides with the axis of the combustion chamber, and the internal temperature distribution is uniform. The gas-solid mixed fuel jet formed by the gaseous fuel carrying the powder fuel is passed into the bottom axial jet inlet, and the axis of the axial jet inlet coincides with the axis of the combustion chamber. The premixed gas entering the combustion chamber radially and the gas-solid mixed fuel entering the axial direction are both introduced into the combustion chamber by means of jet flow, which can effectively reduce the generation of turbulence and backflow, and make the flame well adjustable and controllable. sex. The axial gas-solid mixed fuel jet and the radial premixed lean-burn jet that is uniformly distributed from the outside to the inside are combusted with the surplus oxidant for rapid mixing and high-efficiency combustion. Since the premixed gas introduced in the radial direction is a lean gas, the gas-solid mixed fuel is injected into the combustion chamber through the axial jet inlet, and the global equivalence ratio is adjusted to 1, realizing the staged combustion of the fuel, improving the combustion efficiency and significantly reducing the The emission of NO _X can achieve the purpose of reducing pollution and emission reduction. The inner cavity diameter of each cross-section of the shrinkage cavity is determined by the Vitosins curve equation, which ensures the smooth transition between the shrinkage cavity and the combustion chamber and the smooth transition of the shrinkage cavity itself, reduces the deposition of condensed-phase substances, and enables high-temperature multiphase gas to be injected from the burner. It has a uniform and stable velocity distribution when it comes out, and a stable high-speed multiphase jet flame is formed at the gas outlet of the burner. The shrinkage cavity is provided with an annular water-cooled flow channel, and cooling water flows into/out of the water-cooled flow channel from the cooling water inlet and outlet outside the shrinkage cavity, which can play a role in cooling and protection of the shrinkage cavity.

Beneficial effects:

1. A high-speed multiphase jet burner with a constricted section disclosed in the present invention makes full use of the combustion characteristics of a tubular flame. The annular rectifying medium and porous medium are used to pass the lean-burning premixed gas into the combustion chamber, and a radial flow from outside to inside with uniform distribution of velocity and flow is generated in the combustion chamber; After the mixed gas flows, a tubular flame area is formed in the combustion chamber, resulting in a uniform temperature area; the gas-solid mixed fuel is fed in the axial direction, and the global equivalence ratio is adjusted to 1. The axial gas-solid mixed fuel jet and the center of the tubular flame In addition, the tubular flame is beneficial to reduce the heat loss of the axial fuel jet combustion and improve the reduction It can effectively improve the combustion efficiency and reduce the emission of NO _X , so as to achieve the purpose of reducing pollution and emission reduction.

2. The present invention discloses a high-speed multi-phase jet burner with a constricted section, which fully utilizes the flow characteristics of the radial premixed lean gas flow and the axial fuel jet. Both radial and axial airflow adopt jet flow, which can reduce the generation of turbulence and backflow, which is beneficial to the control of airflow and particle flow velocity, fuel residence time in the combustion chamber and gas temperature. The combustion products of the gas-solid mixed axial fuel jet and the lean-burning tubular flame are rapidly and fully mixed with the help of the impact and flow characteristics of the axial and radial jets, so that the gas-solid mixed axial fuel jet and radial premix The products after the lean-burn tubular flame combustion can be fully reacted, which not only improves the combustion efficiency but also helps to reduce the emission of NO _X.

3. The present invention discloses a high-speed multi-phase jet burner with a constricted section. The axial fuel jet can use the gas-phase fuel jet to carry solid-phase fuel particles to form a gas-solid two-phase flow with good controllability. It can control and realize the stable injection of gas-solid mixed fuel jet. By changing the axial jet flow rate and flow velocity, the gas-solid ratio and powder flow rate of the gas-solid mixed fuel jet can be controlled. By changing the flow rate and velocity of the radial incoming flow and the axial jet, it is possible to control the residence time of the particles in the combustion chamber. The mutual impact of the radial incoming flow and the gas-solid mixed axial fuel jet is conducive to the full mixing of the fuel and the oxidant, and can effectively improve the combustion efficiency of the fuel (especially for the combustion of solid-phase fuel particles with high melting point and difficult ignition and combustion. The efficiency improvement is more significant), thereby forming a high-temperature multiphase gas with efficient combustion.

4. A high-speed multiphase jet burner with a constriction section disclosed in the present invention, the combustion of the gas-solid mixed fuel in the combustion chamber produces a large amount of high-temperature multiphase gas; the constriction cavity is used to carry out the high-temperature multiphase gas produced by the combustion of the gas-solid mixed fuel. Acceleration, the inner cavity diameter of each cross section of the shrinkage cavity is determined by the Vitosins curve equation, which ensures the smooth transition between the shrinkage cavity and the combustion chamber and the smooth transition of the shrinkage cavity itself. The flow velocity distribution and straight flow direction of the gas outlet allow the jet flame at the gas outlet to achieve the required and stable flow velocity, forming a stable high-speed multi-phase jet flame. , the premixed gas with lean combustion is uniformly introduced from the surrounding of the combustion chamber, and an oxidizing atmosphere is formed near the wall of the combustion chamber, which is conducive to suppressing slagging in the burner; the smooth transition of the shrinkage cavity also has the effect of reducing the deposition of condensed phase substances . A water-cooled flow channel is arranged outside the shrinkage cavity, which can realize the cooling protection of the shrinkage cavity when the burner is working through the cooling water.

Description of drawings

1 is a longitudinal cross-sectional view of a high-speed multiphase jet burner with a constricted section;

Figure 2 is a transverse cross-sectional view of the burner at the water-cooled flow channel;

Figure 3 is a transverse cross-sectional view of the burner at the burner frame.

Among them, 1—upper cover, 2—gasket, 3—shrinkage cavity, 4—burner frame, 4.1—outer frame, 4.2—rectifying medium, 4.3—porous medium, 5—base, 6—gas outlet, 7—shaft To the jet inlet, 8—cooling water inlet and outlet, 9—water cooling channel, 10—air flow inlet.

Detailed ways

A high-speed multiphase jet burner with a constriction section disclosed in this embodiment includes an upper cover 1, a gasket 2, a constriction cavity 3, a burner frame 4, and a base 5; wherein the burner frame 4 is composed of an outer frame 4.1, a rectifier The medium 4.2 and the porous medium 4.3 are constituted.

The base 5 is a square structure, the center of the base 5 is provided with a circular axial jet inlet 7, the upper end is provided with a circular boss, and the circular boss structure on the base 5 coincides with the axis of the circular axial jet inlet 7 ; An outer frame 4.1 is installed above the base 5, and the outer frame 4.1 is an outer square and an inner circle structure, and four radial airflow inlets 10 are evenly distributed around. An annular rectifying medium 4.2 and an annular porous medium 4.3 are sequentially installed inside the outer frame 4.1 from outside to inside. The height of the rectifying medium 4.2 and the porous medium 4.3 is the same as that of the outer frame 4.1, and their axes coincide. There is a certain interval between the rectifying medium 4.2 and the outer frame 4.1, forming an annular cavity. The rectifying medium 4.2 and the porous medium 4.3 are closely attached, and the inner diameter of the porous medium 4.3 is equal to the diameter of the circular boss on the base 5, so that the base 5 and the porous medium 4.3 can cooperate with each other and ensure the axial jet inlet on the base 5. 7 coincides with the axis of the porous medium 4.3. A shrinking cavity 3 is installed above the outer frame 4.1. Any cross-section of the inner cavity of the shrinking cavity 3 is circular. The inlet diameter of the shrinking cavity 3 is the same as the inner diameter of the annular porous medium 4.3. The diameter of the inner cavity of the shrinking cavity 3 is along the The axial distribution is determined by the Vitosins curve equation:

In the formula, R ₀ and R ₁ are the exit radius and the entrance radius of the shrinkage cavity 3, respectively, l is the total length of the shrinkage cavity 3, R is the radius of any point, and x is the vertical distance between any point and the inlet end.

There is an annular groove on the shrinkage cavity 3, and the upper cover 1 is installed on the shrinkage cavity 3 to make the annular groove airtight, and then cooling water can be injected into it through the cooling water inlet and outlet 8 outside the shrinkage cavity 3, which is used as the cooling water. Water cooling channel 9.

Gaskets 2 are installed between the base 5 and the outer frame 4.1, the outer frame 4.1 and the shrinking cavity 3, and the shrinking cavity 3 and the upper cover 1 to ensure good sealing between the components of the burner.

There are bolt holes around the upper cover 1, the shrinking cavity 3, the outer frame 4.1 and the base 5, which are fixed by tightening bolts.

The working method of a high-speed multiphase jet burner with a constriction section disclosed in this embodiment is as follows: Lean-burning premixed gas is introduced from the airflow inlets 10 around the outer frame 4.1, and the premixed gas is first mixed with the rectifying medium in the outer frame 4.1. Diffusion in the annular chamber between 4.2, after passing through the rectifying medium 4.2 and the porous medium 4.3, a radial airflow with uniform distribution of flow velocity from outside to inside and around the combustion chamber is formed in the combustion chamber. After ignition of this radial flow, a tubular flame zone is formed in the combustion chamber, the axis of the tubular flame zone being coincident with the axis of the combustion chamber. The gas-solid mixed fuel jet formed by the gaseous fuel carrying powder fuel is passed through the axial jet inlet 7 on the base 5, and the axis of the axial jet inlet 7 coincides with the axis of the combustion chamber. The premixed gas entering the combustion chamber radially and the gas-solid mixed fuel entering the axial direction are both introduced into the combustion chamber by means of jet flow, which can effectively reduce the generation of turbulence and backflow, and make the burner have good adjustable and adjustable control. The lean-burning tubular flame ignites the axially fed gas-solid fuel jet for rapid mixing and efficient combustion. Since the premixed gas introduced radially from the outside to the inside is a lean gas; and then a fuel jet of gas-solid mixture is introduced from the axis of the combustion chamber to make the equivalence ratio 1, thereby increasing the flame temperature and realizing the staged combustion of the fuel. It can significantly reduce the generation of NO _X and achieve the purpose of reducing pollution and emission reduction. The inner cavity diameter of each cross-section of the shrinkage cavity 3 is determined by the Vitosins curve equation, which ensures the smooth transition between the shrinkage cavity 3 and the combustion chamber and the smooth transition of the shrinkage cavity 3 itself, reduces the deposition of condensed-phase substances, and makes the high-temperature multi-phase gas flow away from the combustion chamber. The gas outlet 6 of the burner has a uniform and stable airflow velocity distribution and a straight flow direction when ejecting, so that the jet flame at the gas outlet of the burner can reach the required and stable flow velocity, forming a stable high-speed multiphase jet flame. The constriction cavity 3 is provided with an annular water-cooled flow channel 9 , and cooling water flows into/out of the water-cooled flow channel 9 from the cooling water inlet and outlet 8 outside the constriction cavity, which can play a cooling protection role for the constriction cavity 3 .

In this embodiment, the gas radially introduced into the combustion chamber from the periphery of the outer frame 4.1 is a premixed gas of air and methane, and is in a lean combustion state with an air-fuel ratio less than 1; The gaseous fuel in the gas-solid mixed fuel jet introduced into the combustion chamber is methane, and carbon particles are used as the solid phase fuel in the gas-solid mixed axial fuel jet.

The working method of a high-speed multiphase jet burner with a constriction section disclosed in this embodiment, the specific implementation steps are as follows:

Step 1: Calculate the flow rate of fuel and air that needs to be fed into each inlet when the global equivalence ratio of the burner is 1: The chemical equation for complete combustion of methane and oxygen is: CH ₄ +2O ₂ =CO ₂ +2H ₂ O; carbon The chemical equation for complete combustion with oxygen is: C+O ₂ =CO ₂ ; the calculation is based on the oxygen content in the air being one-fifth. When the burner works stably, the flow rate of premixed gas introduced into the airflow inlet 10 is 24m ³ /h, wherein the ratio of methane to air is 1:15; the flow rate of methane introduced into the axial jet inlet 7 is 0.5m ³ /h h, the flow rate of carbon particles carried in the methane gas stream introduced in the axial direction is 268 g/h after rounding. According to the chemical equation for the complete combustion of methane and oxygen and the chemical equation for the complete combustion of carbon and oxygen, the calculation shows that the global equivalence ratio of the burner is 1 under the above conditions.

Step 2: Carry out pipeline installation, connect the premixed lean gas pipeline of methane and air to each airflow inlet 10 arranged around the outer frame 4.1, and connect methane and carbon particles to the axial jet inlet 7 of the burner base 5 Mixed fuel lines.

Step 3: pass the premixed gas of a small amount of methane and air from the air flow inlet 10, in this step, the total flow of the premixed gas passed in from the air flow inlet 10 is 1.6m ³ /h, and the ratio of methane and air is 1: 15, and ignite the premix of methane and air in the burner.

Step 4: The gas-solid mixed fuel jet of methane and carbon particles is passed through the axial jet inlet 7 on the base 5. In this step, the flow rate of methane is 0.05m ³ /h, and the flow rate of carbon particles is 27g/h.

Step 5: Gradually increase the radial premixed lean gas jet flow, and increase the premixed gas flow of each gas inlet 10 to 24 m ³ /h, wherein the ratio of methane to air is 1:15; The flow rate of methane was increased to 0.5m ³ /h, and the flow rate of carbon particles was increased to 268g/h, finally forming a stable high-speed multiphase jet flame.

Step 6: When stopping the burner, firstly reduce the axial fuel jet flow to zero, and then reduce the methane gas flow and air gas flow in the radial premixed lean gas to zero, and then the burner stops working.

The above description further describes the object, method, device scheme and advantages of the present invention in detail. It should be understood that the above description is only a specific implementation process of the present invention, which is used to explain the present invention and is not intended to limit it. The protection scope of the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention, shall be included within the protection scope of the present invention.

Claims (7)

1. A high-speed heterogeneous jet burner of area shrink section which characterized in that: comprises an upper cover, a gasket, a contraction cavity, a burner frame and a base; the burner frame is composed of an outer frame, a rectifying medium and a porous medium; a plurality of airflow inlets are formed in the periphery of the outer frame and used for introducing premixed lean-burn gas; the porous medium is an annular structure provided with a plurality of radial parallel air inlets; a gap is reserved between the outer frame and the porous medium to form an annular chamber; the rectifying medium is arranged in the annular chamber and fixedly arranged on the porous medium, and lean premixed gas introduced from the airflow inlets around the outer frame is firstly diffused in the annular chamber between the outer frame and the rectifying medium and then passes through the rectifying medium and the porous medium to form radial jet flow which is uniformly distributed around and stable and points to the axis of the combustion chamber in the combustion chamber; a base is arranged below the combustor frame, and a contraction cavity and an upper cover are arranged above the combustor frame; gaskets are arranged between the base and the burner frame, between the outer frame and the contraction cavity, and between the contraction cavity and the upper cover; an internal cavity formed by the base, the porous medium and the contraction cavity forms a combustion chamber of the combustor; the base is provided with an axial jet inlet which can introduce multiphase fuel jet into the combustor; because the inner diameter of the annular porous medium of the combustor is larger than the inner diameter of the axial fuel jet inlet, the speed of the axial fuel jet is reduced after the axial fuel jet is introduced into the combustion chamber, and the retention time is prolonged; the cross section of the inner cavity of the contraction cavity is circular, the end with the larger inner diameter is equal to the inner diameter of the annular porous medium, the inner diameter of the contraction cavity is gradually reduced and smoothly transited, the end with the smaller inner diameter is used as a fuel gas outlet of the combustor, and the contraction cavity is the contraction section of the combustor; the shrinkage cavity is provided with a groove and is sealed with the upper cover to form an annular cavity, the outer side of the shrinkage cavity is provided with a cooling water inlet and outlet, cooling water can be injected into the annular cavity, and the annular cavity is used as a water-cooling flow channel of the combustor to cool the shrinkage cavity.

2. The method of claim 1, wherein: the base is boss-shaped and can be matched with annular porous media, so that the coaxiality of a jet inlet on the base and the combustion chamber is improved.

3. A high-velocity multi-phase jet combustor with a convergent section according to claim 1, wherein: the outer contour of the cross section of the outer frame is square, and the inner contour of the cross section of the outer frame is circular.

4. A high-velocity multi-phase jet combustor with a convergent section according to claim 1, wherein: the number of the air flows arranged around the outer frame is 4, and the air flows are uniformly distributed around and point to the central axis of the combustion chamber.

5. A high-velocity multi-phase jet combustor with a convergent section according to claim 1, wherein: and 1 cooling water inlet and outlet are respectively arranged on the contraction cavity.

6. A high-velocity multi-phase jet combustor with a convergent section according to claim 1, wherein: the outer frame, the base, the contraction cavity and the upper cover can be fixed by fastening bolts through bolt hole positions uniformly distributed on the periphery, and gaskets are arranged between every two parts to ensure sealing.

7. A high velocity multi-phase jet combustor with a constriction as claimed in claim 1, 2, 3, 4, 5 or 6 wherein: introducing lean premixed gas from gas flow inlets around the outer frame, diffusing the premixed gas in an annular cavity between the outer frame and a rectifying medium, and forming radial jet flows uniformly distributed from outside to inside and around in the combustion chamber after the premixed gas passes through the rectifying medium and the porous medium; after the radial jet flow is ignited, gas-phase tubular flame is formed in the combustion chamber, the axis of the tubular flame is superposed with the axis of the combustion chamber, and the internal temperature distribution is uniform. Introducing a gas-solid mixed fuel jet formed by carrying powdered fuel with gas fuel into the axial jet inlet at the bottom, wherein the axis of the axial jet inlet is superposed with the axis of the combustion chamber; premixed gas radially introduced into combustion chamber and axially introduced gas-solidThe mixed fuel is introduced into the combustion chamber in a jet flow mode, so that the generation of turbulence and backflow can be effectively reduced, and flame has good adjustable controllability; the axial gas-solid mixed fuel jet flow and the surplus oxidant after the combustion of the radial premixed lean-burn jet flow which is uniformly distributed from outside to inside and around are quickly mixed and efficiently combusted; because the premixed gas introduced along the radial direction is lean gas, the gas-solid mixed fuel is injected into the combustion chamber through the axial jet flow inlet, the global equivalence ratio is regulated to be 1, the staged combustion of the fuel is realized, the combustion efficiency is improved, and the NO is obviously reduced at the same time _X The purposes of pollution reduction and emission reduction are achieved; the diameters of inner cavities of all cross sections of the contraction cavity are determined by a Witosins curve equation, so that the smooth transition of the contraction cavity and the combustion chamber and the smooth transition of the contraction cavity are ensured, the deposition of condensed phase substances is reduced, high-temperature multi-phase gas has uniform and stable speed distribution when being sprayed out of the combustor, and stable high-speed multi-phase jet flame is formed at a gas outlet of the combustor; the contraction cavity is provided with an annular water-cooling runner, and cooling water flows in/out of a cold runner of the cooling water from a cooling water inlet/outlet on the outer side of the contraction cavity, so that the contraction cavity can be cooled and protected.

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