Construction of Refractory Plastics for Heating Furnace Roof

For the heating furnace, the machine is the skeleton, and the refractory is the flesh and blood. Refractory materials have a great influence on the furnace type and service life of the heating furnace. The technological progress of refractory materials and the performance and quality of refractory materials not only affect the furnace structure of the heating furnace but also affect the operating conditions, maintenance times, and service life of the heating furnace. In recent years, unshaped refractory plastics are often used as refractory lining materials for the heating furnace roof. The Construction of Refractory Plastics for Heating Furnace Roof has gradually become the key point of the refractories of the heating furnace, which is directly related to the service life of the heating furnace. How to carry out the construction of refractory plastics for heating furnace roof?

Construction of Refractory Plastics for Heating Furnace Roof

After completing the preparations for the construction of the refractory plastics, the Construction of Refractory Plastics for Heating Furnace Roof can be carried out.

The refractory plastics’ construction for the heating furnace roof is ramming construction after pouring the nose bridge and soaking a section of the loading and discharging ends, the side pouring part of the hanging wall, and the three hanging wall linings.

The furnace roof ramming is to ram the nose bridge part of the loading and discharging end first and then segment according to the hanging wall, from both ends of each segment to the middle. Keep the door closing at the place where there are few obstacles on the furnace roof. The pressing arc ramming in the preheating section is ramming from the temporary block at the junction of the pressing arc and the horizontal section toward the arc section. After the arc section ramming is completed, the baffle is removed and the horizontal section is rammed. The climbing part of the preheating section is rammed from bottom to top. The furnace roof of the lowering flue heightening section is rammed from both sides to the middle direction.

Anchor bricks can be hung at any time with ramming. After the anchor bricks are installed in place, a wooden wedge is used to wedge between the steel beams and the top surface of the bricks to prevent the anchor bricks from moving and floating during the ramming process. In the process of ramming, check whether the wooden wedge is loose at any time, and remove the wooden wedge after ramming 4 rows of anchor bricks.

Corundum Plastic Refractory
Corundum Plastic Refractory

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Main Ramming Points of Refractory Plastics on Furnace Roof

The plastic billet can be laid out at a time with a thickness of one layer of billets, and it is absolutely not allowed to overlap the two pieces, and the laid layers are arranged staggered. The first is the joint seam of the ramming blank. Then ramming horizontally from top to bottom and from left to right in a zigzag direction, alternating more than 3 times. The excess part of the ramming shall be cut and reused before the installation of the anchor bricks in the lower row. The hammerheads overlap 2/3 in the forward direction and 1/2 between the rows. The ramming surface should be kept perpendicular to the template surface to prevent upper or lower V-shaped gaps on the back of the anchor bricks after hanging the bricks. In the case of intermittent ramming, the refractory plastics film should be used to cover the material. If it takes a long time, the joints should stay in the center of the same row of anchored bricks. When ramming continues, the surface should be roughened and then rammed. The doorway should be rammed or repaired into a funnel shape, layered from the top, and rammed diagonally. The closing door opening will be divided into two of the row of burners. There are more closing door openings, resulting in more vertical layered ramming.

The Trim of the Refractory Plastics
The Trim of the Refractory Plastics

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How to Trim the Refractory Plastics?

After ramming a section with refractory plastic, the hole of the tie rod should be blocked with refractory plastic of the same material from the top and bottom. The trimming of the surface of the plastic body is carried out in sections with the removal of the template. The trimming is based on the end surface of the hanging brick, and the excess part of the surface is removed and the surface is roughened. After that, when the material is not hardened, a 4-6 mm vent hole is opened on the heated surface. If the trimmed material body cannot be baked in time, it should be covered and protected with plastic film until the oven-drying.

Before the oven-drying, for cracks above 12mm, the opening depth of 60mm should be trimmed into an inverted trapezoidal groove. Then use ceramic fiber cotton to fill up the cracks above the inverted trapezoidal groove, and finally spray the water mist to wet the inner surface of the inverted trapezoidal groove, and tamped with the same material and refractory plastic. For cracks below 12mm, just use a 1400°C zirconia-containing fiber blanket to fill it. Cracks below 5mm do not need to be treated.

Summary of Refractory Plastics Construction Technology

Refractory Plastics have an important construction process in the construction of the furnace lining, and the Construction of Refractory Plastics for Heating Furnace Roof is the focus and difficulty of quality control. At the same time, the refractory plastic construction can be standardized because of its operation, and the construction area can be segmented and streamlined. Through the organization of streamlined construction, in addition to effective management and control of the project’s progress goals, the advantage is that each team can implement professional construction, which can fully improve labor productivity and improve technical proficiency. This can save investment and reduce costs. At the same time, professional construction helps to ensure the quality of the project. To learn more about the precautions for the construction of refractory plastics, and to get a free refractory plastic quotation, please contact us. We are Rongsheng Kiln Refractory Manufacturer, and we will provide you with services according to your specific needs.

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