Refractory Checkerwork Support Assembly for 900°C Hot Blast Stoves
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Solution Overview
Problem
Conventional support assemblies in hot blast stoves are limited by the maximum temperature they can endure, typically around 400°C, which restricts the efficiency of heat storage devices and requires frequent switching due to temperature fluctuations and chemical attacks from gases, leading to reduced lifetime and increased energy consumption.
Innovation Solution
A support assembly made entirely of refractory material, including a carrier structure and carrier floor, designed to withstand temperatures up to 900°C and resist nitridation, with features like hollow columns, widening blocks, and distribution blocks to ensure uniform gas distribution and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cast iron support assembly is used, then the support structure provides mechanical strength and stability, but the maximum operating temperature is limited to about 400°C
Solution Approach 1:
The patent changes the material parameter from metallic cast iron to refractory material, enabling the support assembly to withstand temperatures up to 900°C while resisting chemical attacks and nitridation that occur with cast iron at elevated temperatures
Solution Approach 2:
The support assembly uses composite construction with refractory material for temperature resistance, combined with specific structural elements (hollow columns, widening blocks, distribution blocks) to maintain mechanical integrity at high temperatures
2Productivity
If the maximum temperature of hot flue gas is increased to improve heat storage efficiency, then energy efficiency improves, but the lifetime of the support assembly decreases due to nitridation and chemical attacks
Solution Approach 1:
By changing the material composition to refractory material, the patent enables operation at higher temperatures (up to 900°C) without the nitridation and chemical attacks that limit cast iron assemblies, thus improving heat storage efficiency while extending lifetime
Solution Approach 2:
The patent eliminates the need for frequent replacement of support assemblies by using materials that can withstand the operational temperature and chemical environment, transforming from a short-living cast iron assembly to a long-living refractory material assembly
3Ease of operation
If frequent stove switching is performed to maintain temperature thresholds, then constant hot blast air temperature is maintained, but energy consumption increases and productivity decreases
Solution Approach 1:
The refractory material support assembly enables higher temperature operation (up to 900°C), which increases the thermal capacity of the stove and reduces the frequency of switching required to maintain the 1250°C hot blast air temperature threshold, thereby improving productivity and energy efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The refractory material support assembly allows for higher temperature operation, reducing the need for frequent stove switching, enhancing energy efficiency, and extending the lifetime of the heat storage device while maintaining uniform gas distribution.
Implementation Method 1
the refractory material support assembly allows for higher temperature operation, reducing the need for frequent stove switching
Implementation Method 2
resist nitridation, with features like hollow columns, widening blocks, and distribution blocks to ensure uniform gas distribution and stability
Data Source
AI summary
A heat storage device such as a hot blast stove including a heat regeneration checkerwork made of checker bricks, the checkerwork being supported by a support assembly (16). In accordance with an aspect of the present disclosure, the support assembly having a carrier structure made of refractory material and carrier floor also made of refractory material, the carrier floor resting on the carrier structure and being arranged and formed to carry the checker bricks of the checkerwork.