【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20190808

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure, or short-term overheating tube failure, or it can also be referred to as rapid creep damage. Short-term overheating-induced tube failure occurs most frequently in the water wall tubes and slag collection tubes, especially in those areas of the water wall where the heat load is highest, such as near the combustion zone and on the fire-facing side of the tubes surrounding the burners. Superheaters can also experience short-term over-temperature tube bursts. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure, or short-term overheating tube failure, or it can also be referred to as rapid creep damage. Short-term overheating-induced tube failure occurs most frequently in the water wall tubes and slag collection tubes, especially in those areas of the water wall where the heat load is highest, such as near the combustion zone and on the fire-facing side of the tubes surrounding the burners. Superheaters can also experience short-term over-temperature tube bursts. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture.

During operation, the heating surface tubes experience a sudden rise in wall temperature over a short period due to deteriorating cooling conditions, which causes the tensile strength of the steel to drop sharply. Under the pressure of the medium, the fire-facing side with the highest temperature undergoes plastic deformation first, resulting in an expansion of the pipe diameter and a thinning of the pipe wall; subsequently, shear fracture occurs leading to explosion. This type of tube failure is known as short-term over-temperature tube failure, or short-term overheating tube failure, or it can also be referred to as rapid creep damage. Short-term overheating-induced tube failure occurs most frequently in the water wall tubes and slag collection tubes, especially in those areas of the water wall where the heat load is highest, such as near the combustion zone and on the fire-facing side of the tubes surrounding the burners. Superheaters can also experience short-term over-temperature tube bursts. In the case of short-term overheating-induced tube failure, the fracture surface is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture edge is sharp and thin; as a result, the tube cannot withstand the shear stress generated, leading to fracture. Additionally, it is also related to the high-speed ejection of the medium during blasting, which causes a quenching effect on the hot tube walls.

During operation, if the cooling conditions deteriorate and dry burning occurs, the wall temperature of the tube rises suddenly in a short period of time, exceeding the critical value. As a result, the tensile strength of the steel drops sharply, the stress on the tube exceeds its yield limit, leading to shear fracture and tube rupture. This type of tube rupture is known as short-term over-temperature tube rupture. In the case of short-term overheating-induced tube failure, the fracture edge is generally significantly enlarged, the wall thickness is greatly reduced, and the fracture surface appears sharp and thin.