Upper hearth cooling system of gasification furnace

Abstract

The utility model discloses an upper hearth cooling system of a gasification furnace, which is characterized in that a connecting pipe is arranged on the outer side of the welding position of a cooling water pipe and an outer cooling pipe, one end of the connecting pipe is welded with the edge of a copper plate casting and the outer surface of the cooling water pipe, and the other end of the connecting pipe is connected with the outer surface of the outer cooling pipe; and a U-shaped expansion elbow is arranged in the middle of each outer cooling pipe. The cooling water pipe and the outer cooling pipe joint are welded, the connecting pipe is arranged outside the cooling water pipe and the two ends of the connecting pipe are welded in a sealing manner, so that the joint is protected, the deformation force generated after the lower part of the coal gasifier is heated can be resisted, and the stress corrosion cracking at the joint of the upper hearth plate is avoided; and meanwhile, the U-shaped expansion bent pipe additionally arranged in the middle of the outer cooling pipe between the hearth plates can absorb and buffer partial displacement generated by heating of the outer cooling pipe, and the risk of stress corrosion cracking at the joint of the cooling water pipe and the outer cooling pipe is further reduced.

Description

Technical field:

[0001] The utility model relates to the field of coal gasification furnace cooling, in particular to a gasification furnace upper furnace cooling system. Background technology:

[0002] The existing gasifier upper furnace uses pure nickel cooling water pipes, and the upper furnace copper plate castings are cast with pure copper to achieve the effect of heat transfer and heat dissipation. Figures 1 to 3 As shown, after this type of upper furnace has been used for a period of time, a gap is easily generated between the cooling water pipe made of pure nickel and the copper plate casting made of pure copper due to their different expansion coefficients. In addition, the cooling water pipe is connected to the external cooling pipe by welding after docking, which will cause the cooling water pipe to deform or move. Crevice corrosion and stress corrosion will occur at the joints of the furnace cooling water pipe, causing the cooling water pipe joints to break, and the furnace loses its heat exchange effect. In severe cases, the normal operation of the gasifier is affected. Utility model content:

[0003] The utility model aims to provide a furnace cooling system for a gasifier.

[0004] The utility model is implemented by the following technical solutions:

[0005] A furnace cooling system for a gasifier comprises a plurality of cooling components spliced ​​into a cone shape, each group of cooling components comprises at least three copper plate castings spliced ​​together, a cooling water pipe is arranged in each of the copper plate castings, the end of the cooling water pipe is placed outside the copper plate casting, the cooling water pipes in two adjacent copper plate castings in each group of cooling components are connected by an external cooling pipe, and the cooling water pipes are characterized in that a connecting pipe is arranged on the outside of the welding point between the cooling water pipe and the external cooling pipe, one end of the connecting pipe is welded to the edge of the copper plate casting and the outer surface of the cooling water pipe, and the other end of the connecting pipe is connected to the outer surface of the external cooling pipe; a U-shaped expansion elbow is arranged in the middle of each of the external cooling pipes.

[0006] Preferably, the cooling water pipes in the same copper plate casting are arranged in a U-shape, and the angle between adjacent cooling water pipes is 5°.

[0007] Preferably, the central angle corresponding to each of the copper plate castings is 21°.

[0008] The advantages of the utility model are as follows: the joints of the cooling water pipe and the external cooling pipe are welded, and a connecting pipe is arranged on the outside. The two ends of the connecting pipe are sealed and welded, which increases the protection of the joints and can resist the deformation force caused by the heating of the lower part of the gasifier, thereby avoiding stress corrosion cracking at the joints of the upper furnace plate; at the same time, the U-shaped expansion elbow added in the middle of the external cooling pipe between the furnace plates can absorb the displacement of the buffer part of the external cooling pipe caused by heating, and further reduces the risk of stress corrosion cracking at the joints of the cooling water pipe and the external cooling pipe. Description of the drawings:

[0009] Figure 1 It is a schematic diagram of the furnace cooling system of the existing gasifier;

[0010] Figure 2 It is a schematic diagram of the existing cooling components after splicing;

[0011] Figure 3 It is a schematic diagram of the connection between the existing cooling water pipe and the external cooling pipe;

[0012] Figure 4 It is a structural schematic diagram of the utility model;

[0013] Figure 5 It is a schematic diagram of the arrangement of cooling water pipes in the copper plate casting of the utility model;

[0014] Figure 6 It is a schematic diagram of the connection between the cooling water pipe and the external cooling pipe of the utility model.

[0015] In the figure: cooling assembly 1, copper plate casting 2, cooling water pipe 3, external cooling pipe 4, connecting pipe 5, U-shaped expansion elbow 6. Specific implementation method:

[0016] like Figures 4 to 6 As shown, a furnace cooling system on a gasifier comprises 4 groups of cooling components 1 spliced ​​into a cone shape, each group of cooling components 1 comprises 3 copper plate castings 2 spliced ​​together, the copper plate castings 2 are made of red copper and have a thickness of 66 mm, a cooling water pipe 3 is arranged in each copper plate casting 2, the cooling water pipe 3 is made of red copper, the end of the cooling water pipe 3 is placed outside the copper plate casting 2, the cooling water pipes 3 in two adjacent copper plate castings 2 in each group of cooling components 1 are connected through an external cooling pipe 4; a connecting pipe 5 is arranged on the outside of the welding place between the cooling water pipe 3 and the external cooling pipe 4, the cooling water pipe 3 and the external cooling pipe 4 are welded by using ERNiCrFe-3, one end of the connecting pipe 5 is welded to the edge of the copper plate casting 2 and the outer surface of the cooling water pipe 3, and the other end of the connecting pipe 5 is connected to the outer surface of the external cooling pipe 4, and both are welded by using S201; a U-shaped expansion elbow 6 is arranged in the middle of each external cooling pipe 4, and the material is INCONEL625;

[0017] The joints of the cooling water pipe 3 and the external cooling pipe 4 are welded, and a connecting pipe 5 is arranged on the outside. Both ends of the connecting pipe 5 are sealed and welded, which increases the protection of the joints and can resist the deformation force caused by the heating of the lower part of the gasifier, thereby avoiding stress corrosion cracking at the joints of the upper furnace plate; at the same time, the U-shaped expansion elbow added in the middle of the external cooling pipe 4 between the furnace plates can absorb the displacement of the buffer part of the external cooling pipe 4 caused by heating, and further reduce the risk of stress corrosion cracking at the joints of the cooling water pipe 3 and the external cooling pipe 4.

[0018] Cooling assembly 11, copper plate casting 22, cooling water pipe 33, external cooling pipe 44, connecting pipe 55, U-shaped expansion elbow 66

[0019] The cooling water pipes 3 in the same copper plate casting 2 are arranged in a U shape, and the angle between adjacent cooling water pipes 3 is 5°, which can make the copper plate casting 2 evenly cooled, ensure that there will be no temperature difference in local areas, and ensure that the copper plate casting 2 will not experience huge deformation caused by local high temperature.

[0020] The central angle of each copper plate casting 2 is 21°, and after being spliced ​​together, a cone shape corresponding to the outer shell of the gasifier can be formed.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gasifier upper furnace cooling system, comprising a plurality of cooling components spliced ​​into a cone shape, each group of cooling components comprising at least three copper plate castings spliced ​​together, a cooling water pipe is arranged in each copper plate casting, the end of the cooling water pipe is placed outside the copper plate casting, and the cooling water pipes in two adjacent copper plate castings in each group of cooling components are connected by an external cooling pipe, characterized in that: A connecting pipe is provided on the outside of the welding point between the cooling water pipe and the external cooling pipe, one end of the connecting pipe is welded to the edge of the copper plate casting and the outer surface of the cooling water pipe, and the other end of the connecting pipe is connected to the outer surface of the external cooling pipe; a U-shaped expansion elbow is provided in the middle of each external cooling pipe.

2. The gasifier upper furnace cooling system according to claim 1, characterized in that: The cooling water pipes in the same copper plate casting are arranged in a U shape, and the angle between adjacent cooling water pipes is 5°.

3. The gasifier upper furnace cooling system according to claim 1, characterized in that: The central angle corresponding to each copper plate casting is 21°.

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