Plastic Refractory for Boilers

Properties of refractory plastic linings for boilers. Refractory plastic is a kind of plastic refractory material that is mainly made of refractory aggregate and powder, adding appropriate bonding clay, binder and admixture, and kneading. Its varieties are fireclay, high alumina, silicon, magnesium, magnesium chromium, and silicon carbide. Clay and high alumina refractory plastics are the most widely used in soaking furnaces.

Application of refractory plastics for boilers. In the early stage of the application of refractory plastics in the soaking furnace, the furnace lining is damaged due to the breakage of the anchor bricks, and the service life is generally 12 to 15 months. Later, the shape and layout spacing of the anchor bricks were changed, which greatly improved the life of the refractory plastic lining. Generally, it is three times or more than the life of the refractory brick lining, that is, it has reached about five years.

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Micro-expansion Wear Resistant Plastic Refractory

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Micro-expansion refractory plastic for CFB boiler

Rongsheng refractory micro-expansion refractory plastic is made of water glass as binder and sodium fluorosilicate as coagulant. It was first used in the wall pipe of pulverized coal furnace. It has the advantages of strong plasticity at room temperature, strong adhesion, high refractoriness, good sealing and convenient construction. After natural drying, the strength is high, and the volume can expand slightly under high temperature. It can be widely used in CFB boilers, pulverized coal furnaces and other industrial furnace roof wall pipes, furnace flame angles, complex parts of furnace walls, etc., and mainly plays a sealing role. At present, the material can be used in boiler flue, chimney and other pipes containing acid gas.

High-alumina Plastic Refractory
High-alumina Plastic Refractory

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Which refractory plastic is used in the boiler furnace of the power plant

The boiler furnace of a power plant is a high-temperature environment. In order to ensure the safe and stable operation of the furnace, it is necessary to use refractory plastics for repair and maintenance. Commonly used refractory plastics include aluminum silicate plastics, corundum wear-resistant plastics, corundum mullite plastics, high alumina plastics and magnesium aluminum plastics. Among them, aluminum silicate plastics are suitable for high-temperature occasions below 1000 °C, while high-alumina plastics and magnesium-aluminum plastics are suitable for high-temperature occasions above 1000 °C.

Corundum Refractory Plastic
Corundum Refractory Plastic

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Refractory Plastics for Boilers in Chemical Plants

Corundum wear-resistant plastic is made of wear-resistant materials such as corundum and silicon carbide as aggregates, combined with powdery or liquid binders, and mixed with several additives. Plastic with excellent wear resistance at high temperature. It is suitable for the cyclone tube of circulating fluidized bed boiler, the inner lining of the furnace wall and the parts with serious impact and wear of coal ash. Often these parts need to be repaired without stopping the furnace. Furnace repair, furnace repair, in order to solve these problems, Rongsheng refractory manufacturers have introduced repair repair type boiler plastic.

Precautions for High-Temperature Refractory Plastics
Refractory Plastics for Boiler Repair

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Refractory Plastics for Boiler Repair

The operating temperature of the lining of the power generation boiler is generally below 1000°C, and the working conditions are better. The lining of power generation boilers generally also has vertical walls, flat or inclined furnace roofs, hanging arches and furnace bottoms. Its structure can be divided into three types: heavy-duty furnace lining, light-duty furnace lining and tube-coated furnace lining, and wear-resistant plastics are generally used in the working layer of light-duty furnace lining. In addition, the lining of the pulverized coal burner or burner is often made of high-aluminum wear-resistant refractory plastic due to the high temperature and the erosion of pulverized coal particles or air flow. Zhengzhou Rongsheng manufacturers of refractory plastic, boiler refractory plastic manufacturers.

Wear-resistant plastic instructions for use

The refractory plastic is in the form of hard mud paste after mixing, and maintains high plasticity for a long time. It contains more plastic clay components and has more moisture than ramming materials. It has good plasticity before hardening and has certain strength after hardening. It has good sinterability, certain volume stability and other high temperature properties at high temperature. It can be made into flakes and blocks. Certain binders can also be added during construction. When used, the mixture is compacted or pounded, and after being baked, a dense lining and structure can be formed.

In order to give full play to the excellent properties of wear-resistant plastics and prolong their service life. Please strictly follow the instructions provided by the manufacturer when using. Otherwise, its service life will be shortened.

The function and performance of refractory plastic

Refractory plastics are mostly used for furnace walls and roofs of boilers. Also used in heating furnace, soaking furnace and annealing furnace.

Plastic has low bulk density and good thermal shock resistance. When used under heating process and high temperature, it will not cause serious deformation due to crystal phase change. The mineral composition near the heating surface is mullite and cristobalite microcrystals, and the glass phase is less. Therefore, plastics are especially suitable for furnace walls with large temperature fluctuations and high-temperature furnace roofs that are subjected to flame impact or radiation.

The refractory plastic has more voids than the castable, and even after drying, the aggregate and the cement bond still maintain a very close contact. Castables cannot be directly impacted by flames, and will suddenly expand when subjected to rapid changes in furnace temperature, disintegrate the organizational structure, and cause spalling. With refractory plastics, the binder is clay, which shrinks due to drying and dehydration, creating tiny gaps around the aggregate. It can be loosely connected with plastic, has the function of absorbing the sudden expansion of aggregate, and has strong peeling resistance.

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RS Refractory Plastic Factory in Delivery

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Plastics are resistant to acid and alkali corrosion at high temperatures. However, the wear resistance of plastic is not very good, and the aggregate is easy to fall off when it is rubbed. Because the strength of the plastic is not very high, the plastic can be applied to any shape. Can also be used on particularly harsh areas.

Refractory plastics are bonded by phosphoric acid and clay, and are not as smooth as castables. The wear resistance of high alumina cement bond castable is better than that of plastic. However, the phosphate-bonded plastic, whose fine particles can maintain a high bonding strength, can be applied to frictional linings under high temperature conditions. Since phosphate is a thermosetting binder, the plastic bonded by phosphate needs to be dried and baked to obtain high strength after construction.

Refractory plastic hardens slowly after construction and has the disadvantage of low strength at room temperature. Adding an appropriate amount of air-hardening and thermosetting binders can keep the plastics in close contact and withstand the impact of flames.

How to choose a suitable refractory plastic for different high-temperature furnace linings

Each boiler factory and user have different design index requirements. We can optimize the combination according to the user’s requirements to meet the user’s use requirements. To achieve the best operating conditions and service life of the boiler.

When choosing a specific refractory plastic, a variety of factors need to be considered, such as temperature, wear resistance, shock resistance, chemical stability, etc. In addition, it is also necessary to select different types of plastic materials according to the actual situation and use requirements of the boiler furnace of the power plant, combined with the construction process and technical requirements.

It is generally recommended to consult a professional refractory supplier or engineer before purchasing. And choose the most suitable refractory plastic material for your power plant boiler furnace according to its recommendations. Rongsheng refractory manufacturers can provide comprehensive customer service and product service. Free consultation at

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