A generator combustion chamber insulation structure

Abstract

This invention provides a heat insulation structure for a generator combustion chamber, including an outer casing for the combustion chamber. A support is provided at the fuel inlet end of the outer casing, and a flame tube is fixedly mounted on the support. A heat insulation mechanism is provided between the outer casing and the flame tube. The inner wall of the flame tube is coated with a thermal barrier coating formed by a mixture of lanthanum zirconate oxide, rare earth zirconate, and yttrium-stabilized zirconium oxide. Through the heat insulation structure of the generator combustion chamber described in this invention, by positioning the gas film in a suitable position and state for heat insulation, the high-temperature combustion flame is isolated from the wall surface, reducing convective and radiative heat transfer.

Description

Technical Field

[0001] This utility model belongs to the field of generator technology, and specifically relates to a heat insulation structure for a generator combustion chamber. Background Technology

[0002] The combustion chamber insulation structure of a generator set (usually referring to a gas turbine generator set) is the core guarantee for its efficient, safe, and long-life operation. Although the basic principle is similar to that of an aircraft engine combustion chamber, the combustion chamber design of a gas turbine for power generation places more emphasis on long-term reliability, fuel adaptability (including various gaseous / liquid fuels), ease of maintenance, and cost control.

[0003] Existing generator combustion chamber insulation structures use ceramic matrix composites for insulation, and then cooling air is discharged through precision holes / slits in the flame tube wall to form a continuous protective gas film on the inner wall, thus achieving insulation of the generator combustion chamber. However, in actual use, during combustion in the generator combustion chamber, because the generator combustion chamber is conical, it is wider near the nozzle and narrower near the outlet. This results in a larger flame volume near the nozzle and a smaller flame volume near the outlet. However, due to the different flame volumes at different locations, the heating amount of the combustion chamber is different, resulting in poor insulation effect in some areas. Utility Model Content

[0004] In view of this, this utility model addresses the shortcomings of the prior art by providing a heat insulation structure for a generator combustion chamber. By positioning the gas film in a suitable position and state for heat insulation, the high-temperature gas flame is isolated from the wall surface, thereby reducing convective and radiative heat transfer.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a heat insulation structure for a generator combustion chamber, including an outer casing of the combustion chamber, a support is provided at the fuel inlet end of the outer casing of the combustion chamber, a flame tube is fixedly installed on the support, and a heat insulation mechanism is provided between the outer casing of the combustion chamber and the flame tube; the inner wall of the flame tube is coated with a thermal barrier coating formed by a mixture of lanthanum zirconate oxide, rare earth zirconate and yttrium-stabilized zirconium oxide; a cyclone separator is rotatably installed on the support, multiple vortex blades are fixedly installed on the outer arc surface of the cyclone separator, a fuel pipe is fixedly installed in the middle of the support, and a nozzle is provided at the end of the fuel pipe.

[0006] As a further improvement of this utility model, the heat insulation mechanism includes air holes evenly opened on the outer arc surface of the flame tube, and the inner wall of the outer casing of the combustion chamber is provided with a first turbulence ring and a second turbulence ring; the first turbulence ring and the second turbulence ring are respectively installed in conjunction with the adjacent air holes; the tilt angle of the first turbulence ring is 45 degrees, and the tilt angle of the second turbulence ring is 60 degrees.

[0007] As a further improvement of this utility model, the outer arc surface of the flame tube is provided with multiple air inlet pipes, all of which are inclined downwards at a 45-degree angle. Multiple corrugated seats are provided on the outer side of the flame tube, and each corrugated seat has an air inlet chamber, which is connected to the flame tube.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] Firstly, the air entering between the flame tube and the outer casing of the combustion chamber first enters the interior of the flame tube through the inclined air intake pipe. The airflow is intercepted by the air intake chamber on the corrugated seat, allowing the air to enter the interior of the flame tube through the air intake chamber. Then, the air continues to flow, and the airflow is forced to enter the interior of the flame tube through the air hole by the surrounding effect of the first and second turbulence rings.

[0010] Secondly, the combination of the first and second turbulence rings and the air hole creates a large air mold at the outlet of the flame tube, thereby preventing the sidewall of the flame tube from being too close to the flame at the slender conical outlet and affecting the sidewall of the flame tube.

[0011] Thirdly, by coordinating the intake pipe, corrugated seat, intake chamber and air hole on the corrugated seat, a low-temperature gas film can be formed between the high-temperature gas and the wall according to the shape of the combustion chamber. This allows the gas film to provide heat insulation in a suitable position and state, separating the high-temperature gas flame from the wall and reducing convective and radiative heat transfer.

[0012] Fourth, the thermal barrier coating formed by the mixture of lanthanum zirconate oxide, rare earth zirconate and yttrium-stabilized zirconium oxide forms a physical barrier between the high-temperature combustion gas and the metal substrate. Its low thermal conductivity greatly reduces the heat flow to the metal substrate, while its high emissivity helps to radiate heat back into the combustion chamber. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the internal cross-sectional structure of this utility model;

[0016] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0017] Figure 4 This is a schematic diagram of the planar structure of this utility model.

[0018] In the diagram: 101, outer casing of the combustion chamber; 102, support; 103, flame tube; 104, fuel pipe; 105, swirler; 106, vortex blade; 107, nozzle; 201, turbulence ring one; 202, air hole; 203, intake pipe; 204, corrugated seat; 205, intake chamber. Detailed Implementation

[0019] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.

[0020] like Figure 1 , 4 As shown, the device includes an outer casing 101 of the combustion chamber. A support 102 is provided at the fuel inlet end of the outer casing 101. A flame tube 103 is fixedly mounted on the support 102. A heat insulation mechanism is provided between the outer casing 101 of the combustion chamber and the flame tube 103. A swirler 105 is rotatably mounted on the support 102. Multiple vortex blades 106 are fixedly mounted on the outer arc surface of the swirler 105. A fuel pipe 104 is fixedly mounted in the middle of the support 102. A nozzle 107 is provided at the end of the fuel pipe 104. The inner wall of the flame tube 103 is coated with a thermal barrier coating formed by a mixture of lanthanum zirconate oxide, rare earth zirconate, and yttrium-stabilized zirconium oxide.

[0021] like Figure 3 , 4 As shown, the heat insulation mechanism includes air holes 202 evenly distributed on the outer arc surface of the flame tube 103. The inner wall of the outer casing 101 of the combustion chamber is provided with a first turbulence ring 201 and a second turbulence ring. The first turbulence ring 201 and the second turbulence ring are respectively installed in conjunction with the adjacent air holes 202. The tilt angle of the first turbulence ring 201 is 45 degrees and the tilt angle of the second turbulence ring is 60 degrees.

[0022] like Figure 2 , 3 As shown, the outer arc surface of the flame tube 103 is provided with multiple air inlet pipes 203, all of which are inclined downward at a 45-degree angle. Multiple corrugated seats 204 are provided on the outer side of the flame tube 103, and each corrugated seat 204 is provided with an air inlet chamber 205, which is connected to the flame tube 103.

[0023] During use, fuel is delivered into the interior of nozzle 107 through fuel pipe 104, and air enters the combustion chamber of flame tube 103 through conical inlet on support 102. Fuel is injected into the combustion chamber through nozzle, mixes with air and is ignited, and then the mixture of fuel and air is ignited to produce high temperature and high pressure gas, which is finally discharged from the outlet of flame tube 103.

[0024] During the process of air being introduced into the flame tube 103, some air is diverted into the space between the flame tube 103 and the outer casing 101 of the combustion chamber. The air entering the space between the flame tube 103 and the outer casing 101 of the combustion chamber first enters the interior of the flame tube 103 through the inclined air inlet pipe 203. Then, the airflow is intercepted by the air inlet chamber 205 on the corrugated seat 204, allowing the air to enter the interior of the flame tube 103 through the air inlet chamber 205. The air continues to flow, and the airflow is diverted by the flow around the air by the first turbulence ring 201 and the second turbulence ring, allowing the air to enter the interior of the flame tube 103 through the air hole 202.

[0025] During combustion inside the flame tube 103, the densely and evenly inclined air inlet pipes 203 allow the air entering from the air inlet pipes 203 to form a tight air film between the side wall of the flame tube 103 and the flame, preventing the large size of the combustion flame from affecting the side wall of the flame tube 103. The combination of the first baffle ring 201, the second baffle ring, and the air hole 202 creates a large air film at the outlet of the flame tube 103, thus preventing the side wall of the flame tube 103 from being too close to the flame at the slender conical outlet and affecting the side wall of the flame tube 103.

[0026] During the combustion process of the flame, the airflow is intercepted by the corrugated seat 204 and the air inlet chamber 205 on the corrugated seat 204, so that a large amount of air enters the interior of the flame tube 103 from the air inlet chamber 205, further enhancing the quality of the gas film on the side near the nozzle 107. Through the cooperation of the air inlet pipe 203, the corrugated seat 204, the air inlet chamber 205 on the corrugated seat 204 and the air hole 202, a low-temperature gas film is formed between the high-temperature gas and the wall, isolating the high-temperature gas flame from the wall and reducing convective heat transfer and radiative heat transfer.

[0027] Then, during use, a thermal barrier coating formed by mixing lanthanum zirconate oxide, rare earth zirconate and yttrium-stabilized zirconium oxide forms a physical barrier between the high-temperature combustion gas and the metal substrate. Its low thermal conductivity greatly reduces the heat flow to the metal substrate, while its high emissivity helps to radiate heat back into the combustion chamber.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A heat shield structure for a combustion chamber of a generator, comprising a combustion chamber jacket (101), characterized in that: A support (102) is provided at the fuel inlet end of the outer casing (101) of the combustion chamber, and a flame tube (103) is fixedly installed on the support (102). A heat insulation mechanism is provided between the outer casing (101) of the combustion chamber and the flame tube (103).

2. The generator combustion chamber heat insulation structure as described in claim 1, characterized in that: The heat insulation mechanism includes air holes (202) evenly opened on the outer arc surface of the flame tube (103), and the inner wall of the outer casing (101) of the combustion chamber is provided with a first turbulence ring (201) and a second turbulence ring.

3. The generator combustion chamber heat insulation structure as described in claim 2, characterized in that: The first turbulence ring (201) and the second turbulence ring are respectively installed in conjunction with the adjacent air holes (202).

4. The generator combustion chamber heat insulation structure as described in claim 3, characterized in that: The tilt angle of the first turbulence ring (201) is 45 degrees, and the tilt angle of the second turbulence ring is 60 degrees.

5. The generator combustion chamber heat insulation structure as described in claim 1, characterized in that: The outer arc surface of the flame tube (103) is provided with multiple air inlet pipes (203), all of which are inclined downward at a 45-degree angle. Multiple corrugated seats (204) are provided on the outer side of the flame tube (103), and each corrugated seat (204) is provided with an air inlet chamber (205), which is connected to the flame tube (103).

6. The generator combustion chamber heat insulation structure as described in claim 1, characterized in that: A cyclone separator (105) is rotatably mounted on the support (102). Multiple vortex blades (106) are fixedly mounted on the outer arc surface of the cyclone separator (105). A fuel pipe (104) is fixedly mounted in the middle of the support (102). A nozzle (107) is mounted at the end of the fuel pipe (104).

7. The generator combustion chamber heat insulation structure as described in claim 1, characterized in that: The inner wall of the flame tube (103) is coated with a thermal barrier coating formed by a mixture of lanthanum zirconate oxide, rare earth zirconate oxide and yttrium-stabilized zirconium oxide.

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