CN-119573077-B - Heat insulation block and heat shield for combustion chamber

Abstract

The invention relates to the technical field of combustion chambers, in particular to a heat insulation block for a combustion chamber and a heat shield comprising the heat insulation block for the combustion chamber. The heat insulation block for the combustion chamber is provided with a cold face, a hot face and two side faces, wherein the cold face and the hot face are oppositely arranged in the thickness direction, the two side faces are connected with the cold face and the hot face, the side faces extend longitudinally and are oppositely arranged in the transverse direction, grooves are formed in the two side faces to form side edge parts with reduced thickness, a crack guide structure is arranged on at least one side edge part, the side edge parts are formed with thick parts and thin parts which are adjacent longitudinally through the crack guide structure, the thickness of the thick parts is larger than that of the thin parts, the joint part of the thick parts and the thin parts is a crack generation area, the central part of the side edge parts which are not provided with the crack guide structure is a crack generation area, and the crack generation areas on the two side edge parts are arranged in a staggered mode longitudinally. Thus, the cracks extending from the crack generation region to the lateral center region of the heat insulating block in the lateral direction of the heat insulating block are staggered with each other, thereby preventing the whole heat insulating block from breaking.

Inventors

• FANG JIAJIE
• ZHANG SHUAI
• TANG JIAN
• HE LEI
• LIANG YUNFEI
• CHEN MINGMIN
• ZHAO LIANHUI
• SHEN YIWEN
• ZHANG BINGLIN
• WANG YUQI
• YIN PING
• WANG PEIZHE

Assignees

• 上海电气燃气轮机有限公司

Dates

Publication Date

20260512

Application Date

20241206

Claims (10)

1. 1. A heat insulating block for a combustion chamber, the heat insulating block having a cold face (1) and a hot face (2) which are oppositely arranged in a thickness direction, and two side faces (3) which are oppositely arranged in a transverse direction and are connected with the cold face (1) and the hot face (2), wherein grooves (4) are formed in the two side faces (3) to form side edge parts (5) with reduced thickness, characterized in that at least one side edge part (5) is provided with a crack guiding structure (6), the crack guiding structure (6) enables the side edge part (5) to be formed with a thick part and a thin part which are adjacently arranged in the longitudinal direction, the thickness of the thick part is greater than that of the thin part, the joint part of the thick part and the thin part is a crack generating area (7), the central part of the side edge part (5) which is not provided with the crack guiding structure (6) in the longitudinal direction is the crack generating area (7), and the crack generating areas (7) on the two side edge parts (5) are arranged in a dislocation manner in the longitudinal direction.
2. 2. The heat insulating block for a combustion chamber according to claim 1, wherein the crack guide structure (6) is a filling portion (6 a) in which a part of an inner space of the groove (4) is filled, the region of the side portion (5) in the thickness direction where the filling portion (6 a) is provided constitutes the thick portion, and the region of the side portion (5) in the thickness direction where the filling portion (6 a) is not provided constitutes the thin portion.
3. 3. The heat insulating block for a combustion chamber according to claim 2, wherein the filling portion (6 a) and the groove (4) are connected by a curved surface smooth transition.
4. 4. A heat insulating block for a combustion chamber according to claim 2, wherein the length of the filling portion (6 a) extending in the longitudinal direction is not less than 10mm.
5. 5. The heat insulating block for a combustion chamber according to claim 1, wherein the crack guide structure (6) is a groove (6 b) formed in the side portion (5), a region of the side portion (5) in which the groove (6 b) is provided in the thickness direction constitutes the thin portion, and a region of the side portion (5) in which the groove (6 b) is not provided in the thickness direction constitutes the thick portion.
6. 6. A thermal insulation block for combustion chambers according to claim 5, characterized in that the grooves (6 b) are open on the side edges of the side faces (3) which are connected to the hot face (2) and/or the cold face (1).
7. 7. A heat insulating block for a combustion chamber according to claim 5, wherein the depth of the recess (6 b) in the thickness direction is not more than 10mm, and the length of the recess (6 b) extending in the longitudinal direction is not more than 10mm.
8. 8. The heat insulating block for a combustion chamber according to claim 1, wherein the crack guide structure (6) includes a filling portion (6 a) in which a part of the inner space of the groove (4) is filled and a groove (6 b) opened on the side edge portion (5).
9. 9. The heat insulating block for a combustion chamber according to claim 8, wherein an opening position of the groove (6 b) corresponds to an end position of the filling portion (6 a) located on the same side portion (5) in the longitudinal direction in the thickness direction.
10. 10. A heat shield for a combustion chamber, comprising the heat insulating block for a combustion chamber according to any one of claims 1 to 9.

Description

Heat insulation block and heat shield for combustion chamber Technical Field The invention relates to the technical field of combustion chambers, in particular to a heat insulation block for a combustion chamber and a heat shield for the combustion chamber comprising the heat insulation block for the combustion chamber. Background The turbine inlet temperature of the gas turbine is an important index of the technical level of the gas turbine, along with the improvement of the performance of the gas turbine, the temperature in the combustion chamber can reach 1700K or higher during operation and far exceeds the bearable temperature range of the combustion chamber shell, and in order to ensure the safe, reliable and stable operation of the combustion chamber, a heat insulation means is required to be adopted on the inner wall surface of the combustion chamber shell so as to prevent the overheating of the combustion chamber shell. The annular and cylindrical combustion chamber heat insulation mainly adopts a form of a heat shield formed by splicing ceramic heat insulation blocks. In the use process of the ceramic heat insulation block, the wall of the combustion chamber is required to bear long-time high-temperature corrosion and wall vibration, and also is required to bear great thermal stress and high-temperature airflow scouring, so that the ceramic heat insulation block is cracked, and the cracks are almost uniformly distributed in the middle area of four sides of the ceramic heat insulation block, especially in the middle area of two opposite sides of the ceramic heat insulation block with smaller thickness. Along with the long-time service of the ceramic heat insulation block, the number and the length of cracks are continuously increased, cracks generated in the middle areas of two opposite sides extend to the center of the ceramic heat insulation block and converge, the risk that the cracks mutually meet to form penetrating cracks is increased, and the ceramic heat insulation block has the risk of large-area falling damage to the turbine. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention has been made to solve the technical problem of providing a heat insulation block for a combustion chamber, which can guide the positions of crack growth on the heat insulation block so as to allow the cracks to grow in a staggered manner. In order to solve the technical problems, the invention adopts the following technical scheme: the invention provides a heat insulation block for a combustion chamber, which is provided with a cold face, a hot face and two side faces, wherein the cold face and the hot face are oppositely arranged along the thickness direction, the two side faces are connected with the cold face and the hot face, extend longitudinally and are oppositely arranged transversely, grooves are formed in the two side faces to form side edge parts with reduced thickness, a crack guide structure is arranged on at least one side edge part, the crack guide structure enables the side edge part to be formed with a thick part and a thin part which are adjacent longitudinally, the thickness of the thick part is greater than that of the thin part, the joint part of the thick part and the thin part is a crack generation area, the central part of the side edge part which is not provided with the crack guide structure is a crack generation area, and the crack generation areas on the two side edge parts are arranged in a staggered mode longitudinally. Preferably, the crack guide structure is a filling portion in which a part of the inner space of the trench is filled, and the region in which the filling portion is provided in the thickness direction of the side edge portion constitutes a thick portion, and the region in which the filling portion is not provided in the thickness direction of the side edge portion constitutes a thin portion. Preferably, the filling part and the groove are in smooth transition connection through a curved surface. Preferably, the length of the filling portion extending in the longitudinal direction is not less than 10mm. Preferably, the crack guide structure is a groove formed in the side portion, and the region of the side portion where the groove is formed in the thickness direction constitutes the thin portion, and the region of the side portion where the groove is not formed in the thickness direction constitutes the thick portion. Preferably, the recess is provided on a side edge of the side surface which is connected to the hot and/or cold surface. Preferably, the depth of the recess in the thickness direction is not more than 10mm, and the length of the recess extending in the longitudinal direction is not more than 10mm. Preferably, the crack guide structure includes a filling portion in which a part of an inner space of the trench is filled and formed and a groove opened on the side edge portion. Preferably, the opening position