Novel high-temperature superheater structure for circulating fluidized bed

Abstract

The utility model discloses a novel high-temperature superheater structure for a circulating fluidized bed, which is mounted at the upper part of a hearth of a circulating fluidized bed boiler and comprises a high-temperature superheater pipe system, a small sealing plate, a sealing steel plate and an expansion joint, the high-temperature superheater pipe system penetrates through water-cooled wall fins of the boiler, and an elbow of the high-temperature superheater pipe system is left outside the boiler. The small sealing plates, the steel sealing plate and the expansion joint form a high-temperature superheater sealing structure, the small sealing plates are arranged at the through-wall positions of a high-temperature superheater pipe system respectively, the steel sealing plate is connected with all the small sealing plates, and the upper portion of the steel sealing plate is connected with the water cooling wall through the expansion joint. A novel high-temperature superheater structure is composed of the high-temperature superheater pipe system, the small sealing plate, the sealing steel plate and the expansion joint, the problems that a high-temperature superheater pipe clamp and a pipe support are damaged, and a pipe row is disordered and collapsed are solved, safety and reliability of equipment operation are guaranteed, maintenance cost is reduced, overhaul efficiency is improved, and the aim of safe, stable and long-period operation of a boiler is achieved.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, and in particular to a novel high-temperature superheater structure for circulating fluidized beds. Background Technology

[0002] As the main heating surface of a circulating fluidized bed boiler, the high-temperature superheater is a crucial component of the boiler system, directly affecting its operating efficiency and stability, and playing a significant role in the boiler's safe and stable operation. Traditional high-temperature superheaters in circulating fluidized bed boilers mainly suffer from the following problems: high flue gas temperature and large expansion in the superheater cause deformation and damage to the tube clamps and supports, leading to misalignment and collapse of the entire superheater tube bank, thus reducing the service life of the superheater system.

[0003] The conventional approach to this problem is to completely dismantle the high-temperature superheater and move it outside the furnace for straightening and repair. However, this solution increases maintenance and repair costs, is not economical, and is difficult to modify for boilers already in operation due to space constraints. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model designs a novel high-temperature superheater structure for circulating fluidized beds.

[0005] The present invention adopts the following technical solution:

[0006] A novel high-temperature superheater structure for circulating fluidized beds is installed in the upper part of the furnace of a circulating fluidized bed boiler. It includes a high-temperature superheater piping system, sealing plates, sealing steel plates, and expansion joints. The high-temperature superheater piping system passes through the water-cooled wall fins of the boiler, with the elbows of the piping system remaining outside the furnace. The sealing plates, sealing steel plates, and expansion joints form a high-temperature superheater sealing structure. Several sealing plates are respectively arranged at the wall penetration points of the high-temperature superheater piping system. The sealing steel plate connects all the sealing plates, and the upper part of the sealing steel plate is connected to the water-cooled wall via an expansion joint.

[0007] Preferably, the high-temperature superheater tube system is a serpentine heat exchange tube.

[0008] Preferably, the sealing steel plate is connected to all the sealing plates by welding.

[0009] The beneficial effects of this utility model are:

[0010] Compared to the high-temperature superheater of traditional circulating fluidized bed boilers, the high-temperature superheater pipe system, sealing plate, sealing steel plate and expansion joint of this utility model form a new high-temperature superheater structure, which solves the problems of damaged tube clamps and tube supports, and disordered and collapsed tubes in the high-temperature superheater, ensures the safe and reliable operation of the equipment, reduces maintenance costs, improves maintenance efficiency, and achieves the goal of safe, stable and long-term operation of the boiler. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] In the diagram: 1. Expansion joint, 2. Sealing steel plate, 3. High-temperature superheater piping system, 4. Sealing plate, 5. Water-cooled wall. Detailed Implementation

[0013] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0014] Example: Figure 1 As shown, a novel high-temperature superheater structure for a circulating fluidized bed boiler is installed in the upper part of the furnace. It includes a high-temperature superheater pipe system 3, sealing plates 4, sealing steel plates 2, and expansion joints 1. The high-temperature superheater pipe system passes through the fins of the boiler's water-cooled wall 5, leaving the bends of the high-temperature superheater pipe system outside the furnace. The sealing plates, sealing steel plates, and expansion joints form a high-temperature superheater sealing structure. Several sealing plates are respectively arranged at the wall penetration points of the high-temperature superheater pipe system. The sealing steel plate connects all the sealing plates, and the upper part of the sealing steel plate is connected to the water-cooled wall through the expansion joint.

[0015] The high-temperature superheater tube system consists of serpentine heat exchange tubes. All sealing plates are connected by welding.

[0016] The working principle of this invention is as follows: the high-temperature superheater tubes pass through the boiler water-cooled wall fins, leaving the high-temperature superheater elbows outside the furnace. The water-cooled wall fins hold the high-temperature superheater tube bank in place, preventing the tube bank misalignment and collapse problems caused by the original structure. Several sealing plates are arranged at the wall penetration points of the high-temperature superheater tubes. The sealing steel plate connects all the sealing plates, and the upper part of the sealing steel plate is connected to the water-cooled wall through an expansion joint, ensuring the sealing performance of the high-temperature superheater tubes and meeting expansion requirements.

[0017] The high-temperature superheater pipe system, sealing plate, sealing steel plate and expansion joint described in this utility model constitute a new high-temperature superheater structure, which solves the problems of damaged tube clamps and tube supports, and disordered and collapsed tubes in high-temperature superheaters, ensures the safe and reliable operation of the equipment, reduces maintenance costs, improves maintenance efficiency, and achieves the goal of safe, stable and long-term operation of the boiler.

[0018] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A new high temperature superheater structure for circulating fluidized bed, installed on the upper portion of the furnace of a circulating fluidized bed boiler, characterized in that, It includes high-temperature superheater pipe system, sealing small plates, sealing steel plates and expansion joints, the high-temperature superheater pipe system passes through the water-cooled wall fins of the boiler, the elbow of the high-temperature superheater pipe system is left outside the furnace, the sealing small plates, the sealing steel plates and the expansion joints constitute a high-temperature superheater sealing structure, the sealing small plates are arranged at the wall-penetrating positions of the high-temperature superheater pipe system respectively, the sealing steel plates are connected with all the sealing small plates, and the upper portions of the sealing steel plates are connected with the water-cooled wall through expansion joints.

2. A novel high temperature superheater construction for circulating fluidized bed as claimed in claim 1, wherein The high-temperature superheater pipe system is a serpentine heat exchange pipe.

3. A new high temperature superheater structure for circulating fluidized bed according to claim 1, characterized in that, The sealing steel plates are connected with all the sealing small plates through welding.

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