Making the most of scarce resources, preserving the environment, and using energy in an efficient way are the megatrends of our times.
Fluctuating prices for fossile fuels, uncertainties about the usage of nuclear power, and the threat of climate change have led to a global rethinking of key questions.
- What are the best sources to provide energy, electricity, and heat?
- How can we regain and maintain economic growth without further damage to the environment?
- And finally, how do we ensure our standard of living for an ever growing population?
Well-constructed boilers and modern power plants contribute valuable energy and give their share in an integrated approach to waste management.
Controlled incineration processes under technically optimized circumstances provide one part of the answer.
Read more in our brochure Power Plants and Incinerators.
Seven offers complete state-of-the-art environmentally friendly solution to meet the demands for saving energy along with environmental protection
All the products have been developed to guarantee high quality performance and a high degree of innovation.
Seven Refractories provides a wide range of monolithic products maximazing furnace performance.
Refractory solutions and engineering design for:
– walking beam;
– walking hearth;
– rotary hearth
– annealing reheat furnaces;
are realized to meet and exceed customer expectations.
Our products are tailored to any cost effective thermal process with the target to enhance the steel surface quality from the simplest stand-alone heat treatment furnace to complete heat treating lines:
• plastic and gunning mixes
• regular and low cement castable
• precasted pieces
Our products have been developed for the special operating conditions required in the cement manufacturing process. Nowadays, more and more alternative fuels are burned and special refractory materials are required.
To date, a refractory material suitable for all the operative conditions does not exist. Thus, each plant should be analyzed to find the best technical solutions.
We keep a strategic stock of monolithic and insulating castables for the cement customer’s need. In addition we keep a wide stock of all complementary products such as steel and ceramic anchors, bio-soluble and ceramic fibers, and insulating bricks.
With the support of our expert technicians, we supply not only top quality refractories, but also technical solutions and engineering. In cooperation with selected installation companies, we are able to supply turn-key/new projects, along with all the necessary equipment for the lining maintenance of a cement plant.
Each step of the cement-making process has special requirements regarding the correct choice of refractory materials. The design of the plant, the raw materials used in the process, and the various fuel options, all have a major influence on the refractories required. Alkali infiltrations, build-ups, abrasions and the use of alternative fuels, must all be carefully evaluated.
The burner lance is a critical area with specific needs which depend on kiln and grid cooler design, raw materials used and fuels type. Strong thermal load, abrasions, infiltrations and chemical attacks must be considered in the right choice for the monolithic used to line the burner lance.
Cyclones and connecting ducts
The most important step in the efficiency of a modern cement plant is the cyclones system.
Each pre-heating system design is different and unique, and each cyclone system must be analyzed in order to identify the critical refractory zone.
We evaluate the effects of build-up, alkali and chloride infiltration, and all other factors which may influence the performance of refractory materials used in the various cyclone systems.
The calciner plays an important role in the cement manufacturing process being the first step of the clinker production process.
The main property of the calciner’s refractory lining is to withstand to the chemical attacks coming from the hot gases of the process. Refractory materials must have low porosity and good thermal stability.
The riser duct is a problematic zone due to: build-ups, alkali infiltration and chemical attack to the steel anchors. Following the general rule, we suggest lining the duct with bricks in the round sections and with castables in the square sections.
The smoke chamber is a critical area, where build-ups, frequent use of high pressure water pump which causes thermal shock make it necessary to use special refractories.
The nose ring is also a critical area, requiring special monolithic refractory material which has an excellent resistance to:
- High Thermal Shock
- Mechanical Resistance
- Chemical Attack Resistance
Our Seven Cast AS 30 has been developed by our R&D department to ensure the best performance for this critical area along with a very fast installation time.