Low porosity clay brick is a kind of high performance refractory material, which is widely used in high temperature industrial furnaces. The following are its instructions and related precautions:

I. Performance characteristics

Low porosity: The porosity of low porosity clay brick is usually lower than 17% or even lower, which makes it have higher density and corrosion resistance.

High strength: Due to the low porosity, the brick structure is more compact, and the compressive strength is significantly higher than that of ordinary clay bricks.

Fire resistance: the fire resistance can generally reach more than 1400°C, which is suitable for high temperature working conditions.

Chemical corrosion resistance: strong tolerance to acidic or neutral chemicals, especially in metallurgical, chemical and other industries.

Low thermal conductivity: the decrease of pores reduces the thermal conductivity, which can effectively reduce the heat loss and improve the energy utilization rate.

II. Instructions for use

(1) Preparation before construction

Check the quality of the brick body: ensure that the brick body has no cracks, missing corners or other defects.

Cleaning the construction surface: ensure that the construction surface is clean and smooth, free of sundries and oil stains.

Preheating: Before construction, the construction site should be preheated to avoid brick damage caused by excessive temperature difference.

(2) Construction process

Masonry: Use special refractory mud for masonry to ensure the close combination between bricks.

Setting expansion joint: according to the temperature change of the construction site, reasonably set expansion joint to prevent structural damage caused by thermal expansion.

Avoid mechanical impact: In the construction process, severe mechanical impact on the brick body should be avoided.

(3) the oven and use

Oven-drying: After the construction is completed, the temperature should be gradually raised according to the oven-drying curve, so as to avoid the damage of the brick body caused by the rapid temperature change.

Temperature control: During use, the temperature should be strictly controlled to avoid exceeding the refractoriness of the brick.

Regular inspection: check the use of brick regularly, and find and deal with possible damage in time.

III. Application fields

Low porosity clay bricks are widely used in the following fields:

Iron and steel industry: lining material for blast furnace, converter and electric furnace.

Glass industry: used in the wall and bottom of glass melting furnace.

Chemical industry: used for chemical reactors and heat exchange equipment.

Thermoelectric industry: used for lining of coal-fired boilers and gas-fired boilers.

Other high-temperature industries: such as cement kilns and ceramic kilns.

IV. Matters needing attention

Porosity selection: select the appropriate porosity according to the specific working conditions. For example, glass kiln lining usually uses bricks with porosity of 15%-20%.

Environmental adaptability: when used in acidic atmosphere, clay bricks with low porosity have stronger corrosion resistance.

Maintenance cost: Low porosity clay brick has a long service life and can reduce maintenance cost.

Reasonable selection and use of clay bricks with low porosity can effectively improve the operation efficiency and service life of high-temperature equipment.