SiC Swirl Nozzle

Description

RBSiC (SiSiC) desulphurization spray nozzles are the key parts of the flue gas desulphurization system in power generations and large boiler.

Reaction Boned Silicon Carbide(RBSiC or SiSiC) ceramics adopt slip-casting technology. The Ceramics have high strength and excellent hardness, wear, corrosion resistance, oxidization resistance and thermal shock resistance, etc. It’s one of the most popular refractory ceramics. It can be made to beams, rollers, cooling air pipes, thermal couple protection tubes, sealing parts and special shaped parts.

They have been installed in the FGD system of many power generations and large boiler.
What I bring to you today is the knowledge about the characteristics of SiC vortex nozzle. I hope it will be helpful to you.

• We choose wear-resistant and corrosion-resistant vacuum reaction sintered silicon carbide materials.
• There is no internal separation.
• It is not easy to block, and can pass through the particles with large diameter.
• There are clamp connection, flange connection, thread connection and winding connection.

At present, there are two series silicon carbide products of pressureless sintering silicon carbide (SSIC) and reaction sintering silicon carbide (SISIC), which are widely used in mining, metallurgy, chemical industry, electric power, petroleum, furnace, machinery, steel, energy, environmental protection, building materials, semiconductor, aerospace and other fields. Compared with reaction bonded silicon carbide, pressureless sintered silicon carbide has higher purity, better mechanical properties, more prominent corrosion resistance(Resistant to strong acid and alkali corrosion, It is also the only ceramic material which can resistant to hydrofluoric acid corrosion), higher wear resistance, because of there’s no free silicon in the material. It can be used longer service life in environments which other materials not meet.

Silicon carbide (SiC) is a lightweight ceramic material with high strength properties comparable to diamond. It has excellent thermal conductivity, low thermal expansion, and is resistant to acid corrosion. Silicon carbide is an excellent ceramic material suitable for applications requiring good corrosion resistance and wear resistance.

Silicon carbide is formed in two ways, reaction bonding and sintering. Each forming method greatly affects the end microstructure.

Reaction bonded SiC is made by infiltrating compacts made of mixtures of SiC and carbon with liquid silicon. The silicon reacts with the carbon forming more SiC which bonds the initial SiC particles.

Sintered SiC is produced from pure SiC powder with non-oxide sintering aids. Conventional ceramic forming processes are used and the material is sintered in an inert atmosphere at temperatures up to 2000ºC or higher.

Both forms of silicon carbide (SiC) are highly wear resistant with good mechanical properties, including high temperature strength and thermal shock resistance. Our engineers are always available to best advise you on the strengths and weaknesses of each ceramic for your particular needs.

The crystal structure of the SiC ceramic wear-resistant pipe is similar to that of the diamond tetrahedral structure. It is a compound composed mainly of covalent bonds. Its hardness is high (Mohs 9.3), its performance is stable, and its physical properties are similar to diamond. It is also known as emery. Black silicon carbide crystal Hardness is the second-order material for diamonds. It is mainly used for making abrasives and grinding wheels, and partly for the production of silicon carbide ceramics.

Selection Criteria for Silicon Carbide Nozzle Cleaners

Silicon carbide nozzles are used for desulfurization in power plants to remove sulfur dioxide and some polluting gases in the flue gas of power plants. The flue gas of coal-fired power plants and the gas in the gas turbine coal-fired combined cycle have a common task, which is desulfurization and denitrification (and of course dedusting). The flue gas emitted by the power plant without desulfurization and denitrification directly pollutes the atmospheric environment, while the combined cycle flue gas without purification treatment will cause damage to the hot-end components of the gas turbine, and the exhaust gas will also pollute the environment. The reason why silicon carbide nozzles are chosen instead of nozzles of other materials is that it has excellent properties such as high strength, high hardness, strong corrosion resistance, severe wear and high temperature resistance, and has a long service life under harsh conditions. However, after the silicon carbide nozzle works for a long time in a harsh environment, it is also necessary to clean up the dirt, otherwise it will affect the normal spraying. Let us explain how to choose an additive for cleaning silicon carbide nozzles.

1. First, choose a product that cleans dirt quickly and dissolves it thoroughly. The cleaning agent itself has a strong ability to react, disperse or dissolve the dirt, and can remove the dirt more thoroughly in a limited period of time.
2. The damage of the cleaned silicon carbide nozzle should be within the scope of production license, and corresponding measures should be taken to inhibit the corrosion that may be caused by the metal.
3. Chemicals for cleaning are cheap and readily available, and are based on localization; cleaning costs are low and do not cause excessive resource consumption.
4. The cleaning agent is non-toxic or low-toxic to organisms and the environment, and the generated waste gas, waste liquid and waste residue should be able to meet the requirements of relevant national regulations.
5. The cleaning conditions are mild, and try not to depend on the strengthening conditions of the attachment port, such as temperature, pressure, mechanical energy, etc., and do not require too high requirements.
6. The cleaning process will not leave insoluble matter on the surface of the object to be cleaned, will not produce new stains, will not form a new covering layer that is harmful to the subsequent process, and will not affect the quality of the product.
7. Does not produce foam and odors that interfere with the cleaning process and on-site hygiene.