Carbon monoxide, nitrogen oxides, volatile organic compounds, sulfur dioxide, and particulates are commonly referred as “criteria pollutants” because of their contribution to the formation of urban smog. These also have an impact on global climate, although their impact is limited because their radiative effects are indirect, since they do not directly act as greenhouse gases but react with other chemical compounds in the atmosphere. The combustion of fossil fuels, such as coal and heavy fuel oil (HFO), liberate three of the major air pollutants, such as sulfur dioxide (SO2), nitrogen oxides (NOX), and particulates.Particulates can be removed satisfactorily by electrostatic precipitators or cyclones, whereas the nitrogen oxides emissions can be reduced by the use of low NOX burners. Sulfur dioxide emissions can be reduced by the removal of sulfur from the fuel before combustion, by the removal of sulfur dioxide during the combustion process, or by the removal of sulfur dioxide from the flue gases after combustion. The pre-combustion controls comprise selection of low sulfur fuels and fuel desulfurization. The combustion controls are mainly for conventional coal-fired plants and involve in-furnace injection sorbents. The post-combustion controls are the flue gas desulfurization (FGD) processes.
RBSC (SiSiC) desulphurization nozzles are the key parts of flue gas desulphurization system in thermal power plants and large boilers. They are widely installed in the flue gas desulphurizaiton system of many thermal power plants and large boilers. In the 21st century industries world wide will face increasing demands for cleaner, more efficient operations.
ZPC Company (www.rbsic-sisic.com) is committed to doing our part to protect the environment. ZPC facory specializes in spray nozzle design and technological innovation for the pollution control industry. Through higher spray nozzle efficiency and reliability, lower toxic emissions into our air and water are now being achieved. BETE’s superior nozzle designs feature reduced nozzle plugging, improved spray pattern distribution, lengthened nozzle life, and increased reliability and efficiency. This highly efficient nozzle produces the smallest droplet diameter at the lowest pressure resulting in reduced power requirements for pumping.
ZPC Company has: The broadest line of spiral nozzles including improved clog-resistant designs, wider angles, and a complete range of flows. A full range of the standard nozzle designs: tangential inlet, whirl disk nozzles, and fan nozzles, as well as low- and high-flow air atomizing nozzles for quench and dry scrubbing applications. Unparalleled ability to design, manufacture and deliver customized nozzles. We work with you to meet the toughest government regulations. We can meet your special requirements, helping you to achieve optimum system performance.
NOZZLE TYPES – OPTIMAL DROPLET DIAMETER AND DISPERSION
ZPC increases the efficiency of the SO2 absorption with the optimum design and location on the spray bank of the spray nozzles. Our hollow cone and bi-directional nozzles are positioned with computer modeling to achieve optimized gas to liquid contact, scrubbing efficiency and reduce gas sneakage.
Brief Description of FGD Scrubber Zones
Quench:
In this section of the scrubber, the hot flue gases are reduced in temperature before entering the pre-scrubber or absorber. This will protect any heat sensitive components in the absorber and reduce the volume of the gas, thereby increasing the residence time in the absorber.
Pre-Scrubber:
This section is used to remove particulates, chlorides, or both from the flue gas.
Absorber:
This is normally an open spray tower that brings the scrubber slurry into contact with the flue gas, allowing the chemical reactions that tie up the SO 2 to take place in the sump.
packing:
Some towers have a packing section. In this section, the slurry is spread on loose or structured packing in order to increase the surface in contact with the flue gas.
Bubble Tray:
Some towers have a perforated plate above the absorber section. Slurry is deposited evenly on this plate, which both equalizes the gas flow and provides surface area in contact with the gas.
Mist Eliminator:
All wet FGD systems generate a certain percentage of extremely fine droplets that are carried by the movement of the flue gas toward the tower exit. The mist eliminator is a series of convoluted vanes that trap and condense the droplets, allowing them to be returned to the system. In order to maintain high droplet removal efficiency, the mist eliminator vanes must be cleaned periodically.
Post time: May-16-2018