How to do the inside masonry work of furnace with refractory fire brick

The masonry of refractory fire brick is divided into furnace wall, furnace bottom, furnace roof, pipe internal lining, checker, composite brick masonry and expansion gap reserve etc. The masonry of furnace wall is divided into straight wall and circular wall according to the form. This period we will focus on the masonry of straight wall.

Before the masonry of straight wall we should level out the bottom of furnace wall and set lines according to construction drawing on the base of furnace or steel structure. Measure the longitudinal center line and transverse center line and other datum line of furnace body. Find out he dimension line of wall while ensuring the dimension of other parts of furnace body.

The masonry of wall should be flat and vertical, each layer of bricks should be piled with stretched lines as reference. The levelness of each layer of brick of wall should be examined with guiding rule and spirit level. The perpendicularity and gradient of wall should be examined with sample plate, line hammer and guiding rule. The brick joint in the same layer of bricks should be staggered regularly. The mortar in the brick joint should be full. The surface pointing should be tight.

When wall corner masonry is being heated, swelling stress concentrates. This is the weak spot of wall. We should carefully build the refractory brick to make sure the brick joint is staggered and pointing is tight. When building wall pier the vertical brick joint should be staggered. If there is holes with width less than 450mm, we should lay bricks by extruding layer by layer. Each layer of bricks extrude less than 75mm. If there is holes with width less than 250mm we can lay the processed bricks according to drawing requirement. The top of wall should keep level. If necessary we can level out the top of wall with processed brick.

In this period we mainly describe the masonry of straight wall with CCEWOOL refractory bricks. We hope this can bring some help to furnace builders. In next period we will introduce the masonry of circular wall with CCEWOOL refractory fire brick. Please stay tuned.