The combustion chamber of the TO waste gas incinerator is lined with a layer of refractory material, which is also based on the selection method of refractory materials for the lining of industrial heating furnaces. This type of waste gas incineration is not like the smelting furnace in the steel industry, which has high-temperature melting erosion and physical wear damage. The incineration steps of the waste gas incinerator are basically divided into three stages: preheating, combustion and cooling.
Reasonable selection of the lining structure of the TO incinerator can not only effectively block the penetration of flue gas and avoid low-temperature dew point corrosion, but also achieve good thermal insulation effect and extend the service life of the furnace lining. At present, there are two main types of linings for TO furnaces: one is refractory bricks, refractory castables and ceramic fiberboard linings; suitable for combustion temperatures above 1200℃, and the other is a low-temperature 900℃ incineration environment that can all use ceramic fiber module structure linings.
As a lightweight and efficient insulation lining, ceramic fiber block lining has the following technical performance advantages compared with traditional refractory linings:
(1) Low bulk density. The ceramic fiber folding module furnace lining is more than 70% lighter than the lightweight insulation brick lining and 75% to 80% lighter than the lightweight castable lining, which can greatly reduce the load on the kiln steel structure and extend the service life of the furnace.
(2) Low thermal capacity. The thermal capacity of ceramic fiber is only 1/7 of that of lightweight heat-resistant lining and lightweight clay ceramic brick, which greatly reduces the energy consumption in furnace temperature operation control, especially for intermittent heating furnaces.
(3) Low thermal conductivity. The thermal conductivity of the ceramic fiber module is less than 0.11 W·(m·K) at 400℃, less than 0.22 W·(m·K) at 600℃, and less than 0.28 W·(m·K) at 1000℃, which is about 1/8 of lightweight clay brick and 1/10 of lightweight heat-resistant castable.
(4) Excellent thermal shock resistance and mechanical vibration resistance. Ceramic fiber foldable modules are flexible and have excellent resistance to severe temperature fluctuations and mechanical vibrations.
(5) Easy construction. Anchor nails are easy to weld, and their special anchoring method solves the problem of slow installation of traditional modules. After the folding modules are untied, they will squeeze each other in different directions without generating gaps. The furnace lining does not need to be dried or maintained and can be used directly after installation.
The disadvantage of ceramic fiber modules used in TO incinerators is that the maximum resistance to flue gas scouring is 25m/s, and its resistance to high-speed flue gas decreases with the increase of operating temperature. Brushing or spraying surface coating on the surface of ceramic fiber folding module furnace lining can enhance the resistance to flue gas scouring and flue gas intrusion of the fiber module furnace lining to a certain extent; however, since the shrinkage of some surface coatings at high temperatures is inconsistent with the module, the coatings often crack and fall off during the operation of the equipment. Therefore, it is recommended not to use surface coatings to enhance the smoke erosion resistance of fiber modules. If necessary, a matching surface hardener should be used to improve the smoke erosion resistance of the fiber module lining.
