In thermal power plants, mine washing and other industries, the desulfurization system is a very important link. Wet desulfurization is generally used, and the gypsum desulfurization method is the most widely used and lowest-cost method in industrial wet desulfurization.

In desulfurization pipeline systems, lined rubber pipes or lined ceramic pipes are generally used.

1. Abrasiveness of slurry

The absorbent for wet flue gas desulfurization is mainly limestone, and its particle diameter depends on the mesh size of limestone powder, which is generally less than 60 μm. As the flue gas continues to pass, the chemical reaction of limestone slurry absorbing sulfur dioxide continues. The sulfate generated during the reaction precipitates, separates and forms gypsum slurry, which also contains extremely hard solid particles such as silica and alumina. The slurry circulation pump continuously sucks in and discharges the slurry and circulates it back and forth. The slurry continues to strongly impact and wash the pipe wall, causing serious wear or erosion to the rubber lining of the pipe. As the slurry pipeline is used for a long time, the slurry wears and thins the lining rubber for a long time, eventually causing the rubber to be damaged and worn out, exposing the metal layer.

2. Corrosiveness of slurry

Because the slurry is weakly acidic and mixed with some ammonia ions and fluorine ions, these substances will react chemically with the metal layer in the damaged parts of the rubber lining, causing corrosion of the pipeline. In addition, ammonia ion is more likely to be adsorbed on the metal surface than oxygen and crowd out the oxygen, causing the passivation state of the metal to be partially destroyed and causing pitting corrosion, which is also unavoidable for some stainless steel materials. The metal layer of the pipeline is corroded for a longer period of time until the corrosion penetrates, eventually leading to pipeline leakage and affecting the normal operation of the desulfurization system.

Advantages and Disadvantages of Rubber Lined Pipe:

Difference in expansion coefficient: The expansion coefficient of rubber is more than ten times that of steel. Both materials are prone to peeling off of the rubber lining and the metal layer of the pipe when the temperature changes. When starting and stopping the unit or desulfurization system, especially in winter, the instantaneous contact between hot slurry and cold pipes will aggravate this peeling.

Positive and negative pressure peeling and tearing: The desulfurization pipeline is in a positive pressure state during operation and will be in a negative pressure state when out of operation. Under the action of alternating positive and negative pressures and disturbances, bubbling and peeling phenomena can easily occur.

The rubber-lined pipeline for transporting gypsum slurry has extremely high impact resistance. The rubber will deform under impact, absorb the kinetic energy of the particles, and then transfer most of the energy back to the particles in the form of rebound, reducing the impact force and greatly improving the service life. .

The rubber lining with good wear resistance can be formulated according to the needs of wear resistance and is suitable for environments with heavy wear. Its wear resistance is more than 20 times that of steel pipes, more than four times that of ceramics, and more than seven times that of similar rubber-lined pipes. It can be continuously Used for 15-40 years.

It has a wide temperature adaptability range. The rubber-lined steel pipe can be used for a long time in the range of -40 degrees to 140 degrees. The rubber-lined layer will not separate from the steel frame due to temperature changes.

Gypsum slurry rubber-lined pipes have good anti-corrosion properties. The rubber lining can be formulated according to anti-corrosion needs and is suitable for highly corrosive environments. Rubber-lined steel pipes can withstand corrosion from various acids, alkalis, salts, seawater and sewage, and can be used in complex and harsh environments. used in chemically corrosive environments.

The running resistance is small, the energy consumption is reduced, and the inner wall is smooth.

Light weight, easy to install, easy to maintain and transport. The steel frame of the rubber-lined steel pipe only plays a pressure-bearing role and can be thinned to the lowest pressure-bearing level. Its weight is 20-30% lighter than ordinary steel pipes, and the rubber-lined steel pipe is not afraid of bumps. , the lining will not break. The service life of rubber-lined steel pipes is several times longer than that of steel pipes. The average annual investment during the life cycle is low. And because of its light weight, it can save bracket costs and small resistance consumption, which saves operating costs. The comprehensive cost of rubber-lined steel pipes is corresponding. Greatly reduced, which can save users a lot of money.

Most of the desulfurization systems use rubber-lined pipes, which are easily corroded and worn, causing rubber to fall off, pipe leaks, blockages, etc., requiring shutdown and maintenance, which not only wastes a lot of manpower and material resources, but also seriously reduces the production efficiency of thermal power plants.

Therefore, many thermal power plants seek solutions and choose to use wear-resistant ceramic pipes.

The main component of wear-resistant ceramics is alumina. After high-temperature calcination, the alumina is converted into α-alumina, which has stable chemical properties and corrosion resistance. Moreover, the hardness of wear-resistant ceramics is much higher than that of rubber and alloys, and it is wear-resistant. The ceramic adhesive developed and produced by  Ceramics has excellent performance. Coupled with ceramic installation technologies such as welding and dovetail guide rails, it can ensure that wear-resistant ceramic pipes operate stably without falling off. Ensure the normal operation of the vulcanization system, greatly reduce the number of maintenance times and save costs.