Integrated plug-in disc system with high-temperature insulation and barrier gas for a waste heat recovery system in a steel plant

Abstract

Integral plug disc system (1) for a waste heat recovery system in the steel plant, with high temperature insulation integrated into the plug disc and a barrier gas system guided inside the plug disc.

Description

Technical field

[0001] The invention relates to the field of industrial energy and process engineering, in particular to piping and valve technology in high-temperature processes. More specifically, it relates to a plug-type disc system for the reliable shut-off, insulation, and sealing of pipelines in waste heat recovery systems of steel plants. State of the art

[0002] Steel plants generate significant amounts of waste heat, which is increasingly being utilized via heat exchangers and recovery systems. However, these systems are exposed to extreme thermal and chemical stresses.

[0003] Conventional plug-in disc systems have significant drawbacks: they lose considerable amounts of heat at high temperatures and reach very high surface temperatures. This makes safe working conditions in the pipe section separated by the plug-in disc unsafe. To still ensure adequate occupational safety, conventional plug-in disc systems had to be equipped with particularly thick insulating layers. However, this results in very large dimensions, high weight, and therefore more difficult handling and increased installation effort. Object of the invention

[0004] A plug-in disc system is to be provided that: • ensures reliable insulation even at high temperatures in steelworks operations, • Prevents leaks through an integrated barrier gas system, • is designed to be compact and lighter than known systems, • can be integrated into waste heat recovery systems without significant installation effort and • increases operational reliability and energy efficiency. Solution to the task

[0005] The problem is solved by an integral plug-in disc system with high-temperature insulation and an integrated barrier gas system, which has the following features in particular: 1. Thermal insulating layer made of high-temperature resistant fiber mats based on aluminum and silicon oxides, which ensure effective basic insulation against the hot process gases, 2. Superinsulation layer, designed as a vacuum chamber with mirrored or polished inner surfaces, thereby minimizing heat radiation and achieving a particularly high degree of insulation, 3. Hollow chamber with integrated purge connections for sealing air, which allows targeted gas guidance and thus forms an additional barrier against leaks.

[0006] The combination of these three layers creates a multi-stage, compact insulation and sealing system that significantly reduces the surface temperature of the plug disc and enables safe work within the isolated section of pipe. At the same time, the size and weight are considerably reduced compared to conventional plug disc systems. Advantages of the invention • High operational reliability even at temperatures up to 750 °C, • Leakage protection through an active, integrated barrier gas management system, • Compact design thanks to the combination of thermal insulation layer and vacuum chamber, eliminating the need for additional external systems, • Increased energy efficiency through the reliable functioning of waste heat recovery systems in steel plant operations, • Easy integration into existing piping systems of steel plants without extensive modifications, • Low maintenance costs due to the use of durable materials and the integration of all essential functions into one system. Example of implementation

[0007] In a preferred embodiment, the plug-in disc (1) consists of a metallic base body into which the insulating and barrier gas elements are integrated.

[0008] The first layer forms a thermal insulation layer (2) made of aluminum and silicon oxide fiber mats, which acts as a basic barrier against the process heat. This is followed by a super-insulation layer, designed as a vacuum chamber (3) with polished or mirrored inner surfaces. This reduces thermal radiation to a minimum.

[0009] Between the insulation and the outer sealing layer is a hollow chamber (4) into which sealing air is introduced via integrated purge connections. The sealing air prevents the penetration of hot exhaust gases and forms an additional safety layer.

[0010] This combination of fiber insulation, vacuum layer and barrier air chamber results in a particularly effective, multi-stage sealing and insulation system that is specifically tailored to the conditions in waste heat recovery plants of steelworks. Construction (1) Metallic cutting disc (2) Thermal insulation layer (3) Vacuum chamber (4) Hollow chamber (5) Flushing connection (6) Flange gasket (7) Cover plate hot gas side (8) Cover plate cold side (9) Mirror plate 1 (10) Mirror plate 2

Claims

[1] Integral plug disc system (1) for a waste heat recovery system in a steel plant, with high temperature insulation integrated into the plug disc and a barrier gas system guided inside the plug disc. [2] Plug-in disc system (1) according to claim 1, characterized by , that the high-temperature insulation comprises a thermal insulating layer (2) made of fiber mats based on aluminium and silicon oxides. [3] Plug-in disc system (1) according to one of claims 1 or 2, characterized by , that a superinsulation layer is provided which is designed as a vacuum chamber (3) with mirrored or polished internal surfaces. [4] Plug-in disc system (1) according to any one of claims 1 to 3, characterized by , that a hollow chamber (4) with purge connections (5) for sealing air is integrated into the plug disc. [5] Plug-in disc system (1) according to any one of claims 1 to 4, characterized bythat the sealing air is an inert gas, preferably nitrogen. [6] Plug-in disc system (1) according to any one of claims 1 to 5, characterized by that the design is more compact and lighter than conventional plug-in disc systems with equivalent insulation. [7] Plug-in disc system (1) according to any one of claims 1 to 6, characterized by , that it is used in waste heat recovery systems of steel plants that operate with exhaust gas temperatures up to 750 °C.

Images