CN211716613U - Single-pipe flameless combustion chamber of ground gas turbine - Google Patents

Abstract

The utility model discloses a single-tube flameless combustion chamber of a ground gas turbine, comprising a burner, a casing, an inner flame cylinder, an outer flame cylinder and an outlet body; the casing is a cavity structure, and the outer flame cylinder is a column One end is the gas inlet end, the burner is installed at the gas inlet end, and the other end is the flue gas outlet end. , the outlet end of the flue gas extends out of the casing, and the inner flame cylinder is arranged in the outer flame cylinder at intervals; the burner includes a duty nozzle, a gas nozzle, an air nozzle, and a duty nozzle; the flame inner cylinder is a cavity with open ends at both ends. The flame inner cylinder is the combustion chamber. The utility model has the beneficial effects of uniform temperature distribution in the combustion chamber, less nitrogen oxide emission, sufficient combustion, high combustion efficiency, small combustion pressure fluctuation, low combustion noise, and stable combustion, which improves the safe and stable working capability of the gas turbine.

Description

A single-tube flameless combustion chamber for a ground gas turbine

technical field

The utility model relates to the technical field of gas turbine combustion, in particular to a single-tube flameless combustion chamber of a ground gas turbine.

Background technique

A gas turbine is a rotary impeller type heat engine, which uses a continuous flow of gas as a working medium to drive the impeller to rotate at a high speed, thereby converting the energy of the fuel into mechanical energy. Combustor, as one of the three core components of gas turbine, its efficient and clean combustion has become an important research content at present.

Flameless combustion is a new clean combustion technology. This technique was originally used to describe the transparent flame without a distinct flare profile as the fuel burns. The reaction zone of flameless combustion is wider, and the strong high-speed jet will not cause flameless combustion to blow out. Because there is no large temperature gradient, the combustion noise is small, and the flameless combustion process is smooth, soft and quiet. . Compared with traditional combustion methods, flameless combustion has no visible flame front, and the temperature and brightness of the entire furnace are uniform, which avoids the generation of a large amount of NOx and improves the efficiency of heat radiation and heat exchange. One of the most promising clean combustion technologies.

With the development of this technology, developed countries have formed their own technical characteristics based on the principle of flameless combustion, such as Japan's High Temperature Air Combustion (HiTAC, High Temperature Air Combustion) technology, Germany's "flameless oxidation" ( FLOX, namely Flameless Oxidation) combustion technology, Italy's "Moderate and Intensive Low Oxidation Dilution" (Mild, namely Moderate and Intensive Low Oxidation Dilution) combustion technology; American "Low NOx Injection" (LNI, namely Low NOx Injection) combustion technology, etc.

Later, this technology was introduced into the combustion chamber of the combustion turbine. The research shows that: without the need for a heat exchanger, the flue gas in the combustion chamber is mixed with fresh air through a certain structure, and the concentration of oxygen is diluted to about 10%. The blending of flue gas heats the oxidant above the auto-ignition point of the fuel, and can also form a dispersive combustion without a flame front. It is this distributed flame that makes pressure fluctuations in the combustion chamber very small. For hydrogen-rich fuel, during traditional combustion, due to the fast flame propagation speed and short ignition delay time of hydrogen relative to hydrocarbon fuel, the final product NOx emission is high, but the oxidant temperature in flameless combustion is heated to above the ignition point by the flue gas, and The low oxygen concentration can eliminate the influence of different flame propagation speed and ignition delay time, so flameless combustion has the advantage of wide fuel adaptability.

Since the flameless combustion of the gas turbine needs to rely on the recirculation of the flue gas to ensure that the oxygen concentration in the oxidant is diluted to about 10%, and the temperature of the oxidant is higher than the auto-ignition temperature of the fuel, this limits the application range of flameless combustion. Hour, due to the low oxygen concentration in the oxidant, it is easy to cause flameout and cause operation accidents. According to the experimental results of flight parameters and flameless combustion of aero-engines under different working conditions, it is found that the oxygen concentration and temperature requirements of flameless combustion can be achieved by adjusting the amount of backflow flue gas under the conditions of aircraft take-off, climb and landing. Under the idle condition, the oxygen concentration and temperature required for flameless combustion cannot be achieved by adjusting the amount of circulating smoke. When the amount of oil is small and the oxygen concentration in the air is low, it is easy to turn off the engine. Therefore, flameless combustion cannot be used in aviation gas turbines, and is mainly used in gas-fired ground gas turbines.

Chinese Patent Authorization No. CN 102384473 B discloses a flameless trapped vortex burner for a gas turbine, comprising a flameless combustion chamber and a trapped vortex concave flame stabilizer; wherein,

The head includes a zooming nozzle, a bowl-shaped backflow structure, a flame stabilizer in a trapped vortex concave cavity, and an air duct; an annular boss is formed in the center of the front end surface of the n-shaped annular concave cavity, and a central part of the front end surface of the annular boss is protruded forward. Bowl-shaped backflow structure, the circumference of the outer side of the bowl-shaped backflow structure and the circumference of the rear end of the zooming nozzle are fixedly connected, and the inner side wall of the rear end of the zooming nozzle and the outer side of the bowl-shaped backflow structure form an annular air channel;

The diameter of the rear end of the scaling nozzle is smaller than the diameter of the annular boss, and the diameter of the annular boss is smaller than the diameter of the cavity; a plurality of mainstream air ducts are evenly distributed on the bottom surface of the annular air channel, and a plurality of mixing pipes are evenly distributed on the annular boss outside the scaling nozzle. The front end of the mixing pipe is internally sleeved with a mainstream fuel nozzle, the rear end extends into the cavity, and the mainstream air conduit extends backward out of the bottom surface of the annular air channel and extends radially, and communicates with the mixing pipe in one-to-one correspondence;

The trapped vortex concave flame stabilizer includes a concave cavity, an air branch pipe and a fuel branch pipe; a plurality of curved air branch pipes are evenly distributed on the circular side of the concave cavity, and a fuel branch pipe is arranged on the front end surface of the concave cavity between the air branch pipe and the annular boss. The air branch pipes are in one-to-one correspondence with the fuel branch pipes, and the fuel branch pipes extend into the cavity along the axial direction;

The rear part is a flameless combustion chamber, the rear end face of the concave cavity is fixedly connected with the circumference of the front end of the flameless combustion chamber, and the diameter of the flameless combustion chamber is the same as that of the annular boss, so that a plurality of mixing pipes are located around the side wall of the flameless combustion chamber. middle;

When working, the air in the scaling nozzle comes from the compressed air at the compressor outlet, and the air in the air branch comes from the scaling nozzle or the compressor outlet; the fuel in the mainstream fuel nozzle and the fuel branch comes from the fuel tank, but the two The channels are different to ensure that the fuel flow in the trapped vortex concave flame stabilizer does not change with the mainstream fuel flow.

The application combines flameless combustion technology and trapped vortex combustion technology, and takes advantage of the advantages of flameless combustion technology with small pressure fluctuation and low noise to solve the disadvantage of high noise of trapped vortex combustion technology. The advantage of stable combustion can further reduce the flameless equivalence ratio of flameless combustion, and the generated high-temperature flue gas can dilute and heat the fresh mixture, thus broadening the stable combustion range of flameless combustion. This technology provides a new research idea for the research of high-efficiency and low-polluting combustion of gas turbines, which is still under experimental research. It is necessary to point out the shortcomings and incompatibility of this technology.

In "Thermal Power Engineering" (2011, 26(5): 501-506), Mao Yanhui from the Institute of Engineering Thermophysics, Chinese Academy of Sciences summarized the research progress of the flameless combustion technology of gas turbines, and introduced the flameless combustion chambers of gas turbines at home and abroad. It is pointed out that although the structure of the stagnation point recirculation combustion chamber is simple, in the stagnation state, the pressure and temperature will rise sharply, the pressure loss will also increase, and the high temperature of the outlet It will damage imported nozzles and other equipment. At the same time, it is also pointed out that, although the star-shaped body arranged in the center of the flameless vortex vortex burner mentioned above is beneficial for mixing, its blocking effect will cause pressure fluctuations, generate combustion noise, and increase pressure loss, which weakens the gas turbine. Subsequent performance capabilities.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Utility model content

The technical problem to be solved by the utility model is: how to solve the problems of insufficient combustion and high noise of the existing gas turbine.

The utility model realizes and solves the above-mentioned technical problems through the following technical means:

A single-tube flameless combustion chamber for a ground gas turbine, comprising a burner, a casing, an inner flame cylinder, an outer flame cylinder, and an outlet body;

The casing is a cavity structure; the flame outer cylinder is a cylindrical cavity, one end of the flame outer cylinder is the gas inlet end, the burner is installed at the gas inlet end, and the other end is the smoke outlet end; In the casing, the smoke outlet end of the outer flame cylinder extends out of the casing; the inner flame cylinder is arranged in the outer flame cylinder at intervals;

The burner includes a duty nozzle, a gas nozzle, and an air nozzle that are all communicated with the outer flame cylinder. The duty nozzle and the gas nozzle start from the outside of the casing, and the air nozzle starts between the casing and the flame outer cylinder. An air inlet is provided on the side wall of the casing near the flue gas outlet end, and the air enters the air nozzle from the air inlet;

The flame inner cylinder is a cavity with two open ends, and the end close to the burner is the intake end. The air outlet ends of the duty nozzles, gas nozzles and air nozzles face the intake end of the flame inner cylinder, and the flame inner cylinder is the combustion chamber. The end close to the outlet body is the outlet end;

The outlet body is placed at the outlet end of the flue gas in the outer flame cylinder, and is spaced from the inner wall of the outer flame cylinder, and the gap between the outlet body and the inner wall of the outer flame cylinder is the flue gas outlet channel;

The outlet body is spaced apart from the air outlet end of the inner flame cylinder, and the burner is spaced apart from the air inlet end of the inner flame cylinder.

In the utility model, the gas is injected by the gas nozzle, and the compressed air enters the combustion chamber from the air inlet, and after passing through the annular space between the casing and the flame outer cylinder, it is ejected from the air nozzle at a high speed, and the entrainment and mixing zone is formed. The pressure is reduced, and the burned flue gas is continuously driven to flow back from the annular cavity between the outer flame cylinder and the inner flame cylinder. The gas and air ejected at high speed are rapidly mixed with the returning flue gas in the entraining and mixing zone to form a mixed gas with a high temperature and low oxygen atmosphere. The mixed gas enters the inner cylinder of the flame, and under the ignition of the duty nozzle, a diffuse space reaction occurs rapidly in the flameless combustion area. The characteristic of this combustion is that the gas and air are uniformly mixed and diffused into the whole space, the combustion chemical reaction occurs in the whole area, the combustion is rapid, and the combustion efficiency is high. At the same time, the combustion method is obviously different from the traditional combustion technology in that the reaction does not occur on a flame front surface, and local high temperature will not be formed, so there will be no high NOx generation and emission.

After the gas and air react in the flameless combustion zone, they reach the outlet end of the inner flame cylinder. Due to the blocking effect of the outlet bluff body, a part of the high-temperature flue gas is turned around and follows the annular cavity between the inner flame cylinder and the outer flame cylinder. Backflow, a part of the high-temperature flue gas flows out of the combustion chamber through the flue gas outlet end and enters the subsequent work unit.

The utility model overcomes the shortcomings of the traditional gas turbine combustion chamber, such as uneven temperature distribution, high nitrogen oxide emissions, insufficient combustion, low combustion efficiency, etc. The shortcomings of instability and large pressure loss improve the safe and stable operation of the gas turbine.

Preferably, on-duty nozzles are arranged through the center of the burner, and 4-8 gas nozzles are evenly arranged on the same circumference around the periphery of the on-duty nozzle, and each gas nozzle is centered on the circumference of equal diameter. Set 2-6 air nozzles.

Preferably, it also includes an air intake pipe arranged in the direction of the vertical air nozzle, the air intake pipe is communicated with the air nozzle, the inlet of the air intake pipe is arranged between the casing and the outer flame cylinder, and the air passes through the air inlet through the casing and the outer flame cylinder. After entering the air intake pipe, it enters the air nozzle.

Preferably, the diameter of the flue gas outlet end of the outer flame cylinder is smaller than the diameter of the gas inlet end.

Preferably, a plurality of cooling holes are provided on the cylinder wall of the flame outer cylinder.

Preferably, the end of the outlet body close to the flame inner cylinder is a cylinder, and the end away from the flame inner cylinder is a cone.

Preferably, the outer surface of the outlet body is provided with a guide column in the circumferential direction. The guide column is a flat structure and is fixed on the outlet body in a diverging shape. There is a gap between adjacent guide columns. The edge of the flame is detachable and connected to the inner cylinder of the flame.

The conical solid structure of the guide column and the outlet bluff body forms a gradually expanding space, which slows down the external expansion disturbance generated by the mixed gas after it flows out of the combustion chamber, realizes the smooth guidance of the combustion flue gas, and further enhances the combustion flame in the combustion chamber. stability.

Preferably, the end of the outlet bluff body close to the inner flame cylinder is coated with a high temperature resistant and erosion resistant layer.

Preferably, the inner wall of the air inlet end of the flame inner cylinder is provided with a venturi throat structure.

Preferably, the inner wall of the flame inner cylinder is coated with a high temperature resistant layer.

The advantages of the present utility model are:

(1) In the present utility model, the gas is injected by the gas nozzle, and the compressed air enters the combustion chamber from the air inlet, and after passing through the annular space between the casing and the flame outer cylinder, it is ejected at a high speed by the air nozzle, and causes entrainment The pressure in the blending zone is reduced, which continuously drives the combustion flue gas to flow back from the annular cavity between the outer flame barrel and the inner flame barrel. The gas and air ejected at high speed are rapidly mixed with the returning flue gas in the entraining and mixing zone to form a mixed gas with a high temperature and low oxygen atmosphere. The mixed gas enters the inner cylinder of the flame, and under the ignition of the duty nozzle, a diffuse space reaction occurs rapidly in the flameless combustion area. The characteristic of this combustion is that the gas and air are uniformly mixed and diffused into the whole space, the combustion chemical reaction occurs in the whole area, the combustion is rapid, and the combustion efficiency is high. At the same time, the combustion method is obviously different from the traditional combustion technology in that the reaction does not occur on a flame front surface, and local high temperature will not be formed, so there will be no high NOx generation and emission.

After the gas and air react in the flameless combustion zone, they reach the outlet end of the inner flame cylinder. Due to the blocking effect of the outlet bluff body, a part of the high-temperature flue gas is turned around and follows the annular cavity between the inner flame cylinder and the outer flame cylinder. Backflow, a part of the high-temperature flue gas flows out of the combustion chamber through the flue gas outlet end and enters the subsequent work unit.

The utility model overcomes the shortcomings of the traditional gas turbine combustion chamber, such as uneven temperature distribution, high nitrogen oxide emissions, insufficient combustion, low combustion efficiency, etc. The shortcomings of instability and large pressure loss improve the safe and stable operation of the gas turbine.

(2) The conical solid structure of the guide column and the outlet bluff body forms a gradually expanding space, which slows down the external expansion disturbance generated by the mixed gas after it flows out of the combustion chamber, realizes the smooth guidance of the combustion flue gas, and further enhances the combustion Indoor combustion flame stability;

(3) The utility model can also be applied to different types of fuel gas, and can be applied to liquid fuel, and has strong adaptability.

Description of drawings

1 is a schematic diagram of the internal structure of a single-tube flameless combustion chamber of a ground gas turbine in Embodiment 1 of the present invention.

Figure 2 is a schematic view of the outlet circumferential section of the burner.

3 is a schematic diagram of the internal structure of a single-tube flameless combustion chamber of a ground gas turbine in Embodiment 2;

FIG. 4 is a schematic three-dimensional installation diagram of the outlet bluff body and the guide column in the second embodiment.

FIG. 5 is a schematic diagram of the combustion gas flow in the upper half section of the combustion chamber.

Reference numerals in the figure: burner 1, gas nozzle 11, duty nozzle 12, air nozzle 13, air intake pipe 14, casing 2, air inlet 21, flame outer cylinder 3, cooling hole 31, flame inner cylinder 4, Venturi Pipe throat structure 41, outlet body 5, guide column 6,

Entrainment and blending zone A, flameless combustion zone B

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are Some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example 1:

As shown in Figure 1, a single-tube flameless combustion chamber of a ground gas turbine includes a burner 1, a casing 2, an outer flame cylinder 3, an inner flame cylinder 4, and an outlet body 5; the casing 2 is a cavity structure , the flame outer cylinder 3 is a cylindrical cavity, the left end is the gas inlet end, the burner 1 is installed at the gas inlet end, the right end is the flue gas outlet end, and the outlet body 5 is placed at the smoke outlet in the flame outer cylinder 3 At the end, the flame outer cylinder 3 is placed in the casing 2, the flue gas outlet end extends out of the casing 2, and the flame inner cylinder 4 is arranged in the flame outer cylinder 3 at intervals;

As shown in FIG. 2 , the burner 1 includes a uniform gas nozzle 11 , a duty nozzle 12 , and an air nozzle 13 . The center of the burner 1 is provided with the duty nozzle 12 , and is on the same circumference as the periphery of the duty nozzle 12 . 4-8 gas nozzles 11 are evenly arranged on the top, and 2-6 air nozzles 13 are evenly arranged on the circumference of equal diameter with each gas nozzle 11 as the center. In this embodiment, there are six gas nozzles 11 , and each gas nozzle 11 is provided with two air nozzles 13 on the periphery thereof.

Among them, the gas nozzle 11 and the duty nozzle 12 start from the outside of the casing 2; they also include an air intake pipe 14 arranged in the direction perpendicular to the air nozzle 13. The air intake pipe 14 is diverging in the circumferential direction, communicates with the air nozzle 13 and is vertical , and the air intake end of the air intake pipe 14 is in a horn-like structure, the inlet of the air intake pipe 14 is arranged between the casing 2 and the flame outer cylinder 3, the air enters from the air intake pipe 14, and is ejected by the air nozzle 13; The nozzle 13 has a tapered structure. In FIG. 1 , the diameter of the right end is smaller than the diameter of the left end.

The casing 2 can be a cylindrical structure with a blind hole at the left end and an open hole at the right end, and an air inlet 21 is provided near the flue gas outlet end. After the air enters from the air inlet 21, it passes between the flame outer cylinder 3 and the casing 2 After the annular space is formed, it enters the air intake pipe 14, and is then sprayed into the flame inner cylinder 4 by the air nozzle 13;

The flame outer cylinder 3 is a cylindrical structure with a closed left end and a narrowed and open right end. It is centrally arranged inside the casing 2, the burner 1 is arranged through the center of the left end, and the small diameter section of the right end passes through the casing 2 and protrudes. A plurality of cooling holes 31 are provided on the cylinder wall in the middle, and the opening area is from the position corresponding to the air inlet 21 to the leftmost end. Wherein, the ratio of the length of the flame outer cylinder 3 to its cross-sectional diameter is 2-4, and the diameter of the flue gas outlet end (ie the small diameter section) of the flame outer cylinder 3 is smaller than the diameter of the gas inlet end (large diameter section). , the cross-sectional diameter ratio of the small-diameter section at the tail of the outer flame cylinder 3 to the large-diameter section of the outer flame cylinder is 0.85-0.95.

The flame inner cylinder 4 is a cavity with open ends at both ends, and the end close to the burner 1 is the intake end. The inside of the flame inner cylinder 4 is a combustion chamber, and the end close to the outlet body 5 is the gas outlet. The inner wall of the air inlet end of the flame inner cylinder 4 is provided with a venturi tube throat structure 41 . And the inner wall of the flame inner cylinder 4 is coated with a high temperature resistant layer. The ratio of the length of the inner flame tube 4 to the diameter of its section is 2-4; the ratio of the section diameter of the inner flame tube 4 to the outer flame tube 3 is 0.8-0.9.

The distance between the front end face of the flame inner tube 4 and the outlet end face of the burner 1 is 0.4-0.6 times the cross-sectional diameter of the flame inner tube 4; 0.2-0.3 times.

The outlet body 5 is placed at the outlet end of the flue gas in the outer flame cylinder 3, and is arranged at intervals with the inner wall of the outer flame cylinder 3, and the gap between the outlet body 5 and the inner wall of the outer flame cylinder 3 is the flue gas outlet channel;

The outlet body 5 and the gas outlet end of the flame inner cylinder 4 are arranged at intervals. In order to realize that the flue gas is divided into two strands, one strand of flue gas flows out, and the other strand of flue gas returns to the intake end. The intake end of the burner 1 and the flame inner barrel They are arranged at intervals in order to mix the other recirculated flue gas from the gas outlet with the mixed gas of the burner 1 .

As shown in FIG. 5 , in this embodiment, the gas is injected from the gas nozzle 11 , and the compressed air enters the combustion chamber from the air inlet 21 , and enters the air intake pipe after passing through the annular space between the casing 2 and the flame outer cylinder 3 . 14. It is ejected from the air nozzle 13 at a high speed and causes the pressure in the entraining and mixing zone to decrease, and continuously drives the burned flue gas to flow back from the annular cavity between the flame outer cylinder 3 and the flame inner cylinder 4. The gas and air ejected at high speed are rapidly mixed with the recirculating flue gas in the entraining and mixing zone A to form a mixed gas with a high temperature and low oxygen atmosphere. The mixed gas enters the inner cylinder of the flame, and under the ignition of the duty nozzle 12, a diffuse space reaction occurs rapidly in the flameless combustion zone B.

The characteristic of this combustion is that the gas and air are uniformly mixed and diffused into the whole space, the combustion chemical reaction occurs in the whole area, the combustion is rapid, and the combustion efficiency is high. At the same time, the combustion method is obviously different from the traditional combustion technology in that the reaction does not occur on a flame front surface, and local high temperature will not be formed, so there will be no high NOx generation and emission.

After the gas and air react in the flameless combustion zone, they reach the gas outlet end of the inner flame cylinder 4. Due to the blocking effect of the outlet bluff body 5, a part of the high-temperature flue gas turns around and travels along the gap between the inner flame cylinder 4 and the outer flame cylinder 3. A part of the high-temperature flue gas flows out of the combustion chamber through the flue gas outlet end and enters the subsequent work unit.

This embodiment overcomes the shortcomings of the traditional gas turbine, such as uneven temperature distribution in the combustion chamber, high nitrogen oxide emissions, insufficient combustion, low combustion efficiency, etc., and also overcomes the prior art. The shortcomings of instability and large pressure loss improve the safe and stable operation of the gas turbine.

Embodiment 2:

As shown in FIGS. 3 and 4 , the end of the outlet body 5 close to the inner cylinder 4 of the flame is a cylinder, and the end away from the inner cylinder 4 of the flame is a cone. And the ratio of the section diameter of the cylinder of the outlet bluff body 5 to the inner flame cylinder 4 is 0.75-0.9.

In this embodiment, the outer surface of the outlet body 5 is provided with a guide column 6 in the circumferential direction. The guide column 6 is a flat structure and is fixed on the outlet body 5 in a divergent shape. There is a gap between them, and the edge of the guide column 5 is detachably connected to the inner wall of the inner flame cylinder 4 .

The conical solid structure of the guide column 6 and the outlet bluff body 5 forms a gradually expanding space, which slows down the external expansion disturbance generated by the mixed gas after flowing out of the combustion chamber, realizes the smooth guidance of the combustion flue gas, and further enhances the combustion chamber. Combustion flame stability.

The end of the outlet bluff body 5 close to the inner flame cylinder 4 is coated with a high temperature resistant and erosion resistant layer.

It should be noted that the single-tube flameless combustion chamber of the ground gas turbine can be used for different types of gas and liquid fuel. Before changing the use of fuel with different characteristics, it is necessary to calculate and simulate the mixing and combustion conditions of fuel, air and flue gas in the combustion chamber, adjust the jet velocity of fuel and air, and adjust the outer edge of the guide column 6 and the outer edge of the guide column. The fixed position of the inner wall of the tail of the outer flame cylinder 4 is adjusted so as to form flameless combustion in the combustion chamber.

The above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be used for the foregoing implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A single-tube flameless combustion chamber of a ground gas turbine is characterized by comprising a combustor, a casing, a flame inner cylinder, a flame outer cylinder and an outlet pause body;

the casing is of a cavity type structure; the outer flame tube is a cylindrical cavity, one end of the outer flame tube is a gas inlet end, the burner is installed at the gas inlet end, and the other end of the outer flame tube is a flue gas outlet end; the outer flame tube is arranged in the casing, and the smoke outlet end of the outer flame tube extends out of the casing; the flame inner barrel is arranged in the flame outer barrel at intervals;

the combustor comprises an on-duty nozzle, a gas nozzle and an air nozzle which are communicated with the flame outer cylinder, the on-duty nozzle and the gas nozzle start from the outside of the casing, the air nozzle starts between the casing and the flame outer cylinder, an air inlet is formed in the side wall of the casing close to the smoke outlet end, and air enters the air nozzle from the air inlet;

the inner flame tube is a cavity with two open ends, one end close to the burner is an air inlet end, the air outlet ends of the duty nozzle, the gas nozzle and the air nozzle face the air inlet end of the inner flame tube, a combustion cavity is arranged in the inner flame tube, and one end close to the outlet pause body is an air outlet end;

the outlet pause body is arranged at the smoke outlet end in the flame outer cylinder and is arranged at intervals with the inner wall of the flame outer cylinder, and a gap between the outlet pause body and the inner wall of the flame outer cylinder is a smoke outlet channel;

the outlet port block body is arranged at an interval with the air outlet end of the flame inner barrel, and the burner is arranged at an interval with the air inlet end of the flame inner barrel.

2. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein the center of said combustor is penetrated by said pilot nozzle, 4-8 gas nozzles are uniformly arranged on the same circumference of the periphery of said pilot nozzle, and 2-6 air nozzles are uniformly arranged on the circumference of equal diameter with each gas nozzle as the center.

3. The single-tube flameless combustor of a ground gas turbine as claimed in claim 2, further comprising an air intake tube disposed perpendicular to the direction of the air nozzle, the air intake tube communicating with the air nozzle, an inlet of the air intake tube being disposed between the casing and the flame outer tube, and air entering the air nozzle from the air inlet through the space between the casing and the flame outer tube.

4. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein a diameter of a flue gas outlet end of said flame outer tube is smaller than a diameter of a gas inlet end.

5. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein a plurality of cooling holes are formed on the wall of said flame outer tube.

6. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein an end of said outlet port block near said flame inner tube is a cylinder and an end far from said flame inner tube is a cone.

7. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein the outer surface of the outlet frame is circumferentially provided with flow guiding columns, the flow guiding columns are flat structures and are fixed on the outlet frame in a divergent manner, gaps exist between adjacent flow guiding columns, and the edges of the flow guiding columns are detachably connected with the inner flame tube.

8. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein an end of said outlet port body adjacent to said flame inner tube is coated with a high temperature and erosion resistant layer.

9. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein an inner wall of the inlet end of the flame inner tube is provided with a venturi throat structure.

10. The single-tube flameless combustor of a ground gas turbine as claimed in claim 1, wherein the inner wall of the flame inner tube is coated with a high temperature resistant layer.

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