On the morning of April 8, China's industrial ceramics technology leader PMSM Group plans to build a 1,000-ton high-performance silicon carbide ceramic heat exchange tube project base, with a 200-ton construction first.
High performance silicon carbide ceramic heat exchange tube
PMSM Group and China Silicon Carbide Materials Research Institute started to conduct high-performance silicon carbide ceramic research in China since 1987. With the support of the National "Eleventh Five-Year Plan" and "863" plan, the country first took the lead in the research and development of new silicon carbide ceramic heat exchange components; in 2009, it successfully developed silicon carbide ceramic heat exchange tubes, and its main performance reached international advanced levels. In 2010, it successfully developed a 1500mm long silicon carbide ceramic heat exchange tube. In 2012, it began to establish a pilot production line for a 3000mm long silicon carbide ceramic heat exchange tube.
The main characteristics of the application of silicon carbide ceramics in the field of heat exchange are its high thermal conductivity and comprehensive corrosion resistance. For this long tube and wall structure, it must be realized by extrusion molding and atmospheric pressure solid phase sintering process.
For the B-C solid phase sintering system, it is difficult to achieve its dispersion in the water-based slurry. Especially the water-based dispersion of nano carbon black is a recognized technical bottleneck. Based on the long-term technology accumulation of the group companies and research institutes in the field of silicon carbide ceramics, this difficulty has been solved, and the surface modification of nano carbon black can achieve its uniform dispersion in the silicon carbide slurry.
On the other hand, the key to high-purity silicon carbide ceramic water-based extrusion molding lies in a reasonable powder treatment process. Even dispersion, high-flowing powder and high-plasticity mud are the key. Based on the core technology of powder processing of silicon carbide ceramics in aviation, aerospace and other fields, it was introduced into the water-based extrusion molding process to successfully realize the extrusion molding of silicon carbide ceramic heat exchange tubes.
Finally, it is very important to control the high temperature deformation of long tube and wall silicon carbide ceramic heat exchange tube. Shanghai Silicate Research Institute's precision machining technology for complex shapes of various silicon carbide optical components and reliable low-stress sintering ensure high-temperature sintering of silicon carbide heat exchange tubes.
Technical characteristics
The production technology of silicon carbide ceramic heat exchange tube is characterized by a complete set of equipment and technologies such as domestic powder modification treatment, continuous water-based extrusion molding, automatic drying and deformation-free high-temperature sintering. The advantages of this technology are continuous production, automation and high efficiency.
There are no domestic manufacturers who have mastered high-performance silicon carbide ceramic heat exchange tubes, especially the preparation technology with a length of more than 1500mm has not achieved a breakthrough. Internationally, only Saint-Gobain of France has the production capacity of silicon carbide ceramic heat exchange tubes.
In terms of product performance indicators, the main performance indicators of PMSM silicon carbide ceramic heat exchange tubes are comparable to those of international companies; in terms of technological maturity, Saint-Gobain of France has achieved commercial production of silicon carbide ceramic heat exchange tubes, and a full set of production lines has been perfected. . PMSM is still in the stage of pilot scale-up research and development, but has already developed 1500mm length silicon carbide ceramic heat exchange tubes in small batches, is in the process of building a 3000mm length pilot line, and has established relevant enterprise technical standards and completed the drafting of industry technical standards Work; in terms of product prices, foreign products are at a disadvantage in terms of raw materials and labor costs. Domestic silicon carbide ceramic heat exchange tubes have a clear advantage in product prices.
Applicable fields and scope
Core components of heat exchangers and condensers in the industrial fields of power, steel, metallurgy, chemical industry, machinery, textile, etc., especially suitable for harsh working conditions such as high temperature resistance, high pressure resistance, strong acid and alkali corrosion resistance, high speed air flow erosion resistance, particle wear resistance, etc. condition.
Expected benefit
At present, the requirements for energy saving, emission reduction and environmental protection are becoming higher and higher, and the market demand for heat exchange under high temperature, high pressure, strong acid and alkali corrosion environments is becoming more and more urgent. Silicon carbide ceramic heat exchanger is a new type of high-performance heat exchanger, which comprehensively utilizes the high strength, high temperature resistance, high thermal conductivity and comprehensive acid and alkali corrosion resistance of silicon carbide ceramics. Both economic and social benefits will be huge. According to relevant statistics, the potential market capacity of graphite heat exchangers is more than 20 billion yuan in 2015, and fluoroplastic and precious metal heat exchangers are about 10 billion yuan, respectively. If even 20% of silicon carbide ceramic heat exchangers are replaced, the market capacity of silicon carbide ceramic heat exchangers will reach more than 10 billion yuan in 2020.