The role of flue gas bypass baffle in wet flue gas desulfurization of sintering machine
The spray layer is arranged on the upper part of the absorption tower, and the absorption tower slurry circulating pump is corresponding to the spray layer. Each spray layer is composed of a series of nozzles, which is used to refine the circulating slurry. A spray layer comprises a main pipe and a branch pipe, and the lateral branch pipe of the main pipe is arranged in pairs. The arrangement of the nozzle can realize uniform spraying effect on the absorption tower cross section. The absorption tower circulation pump the slurry circulating Tane into the spray layer, in order to prevent Tane sediment suction pump body pump caused by blockage or damage and blockage of the nozzle, the circulating pump is equipped with stainless steel screen before the grid (Tane). Single cycle pump failure, the FGD system can be carried out properly, if all the circulating pump outage, FGD system will protect the outage, flue gas bypass.
The desulfurization flue gas from the absorption tower general in 46~55 degrees Celsius, saturated water vapor, SO2, SO3, residual HCl, HF, NOx, SO42-/sup>, SO32- with salt will dew, if directly discharged without any treatment, easy to form acid mist, and could affect the uplift height and gas diffusion. Wet FGD system is usually equipped with a gas gas heat exchanger (GGH) flue gas reheater. Air - to - air heat exchanger is a kind of regenerative heating technology, which is often called GGH. It is not hot flue gas desulfurization (130~150 DEG C) to flue gas desulfurization has been heated, usually heated to 80 DEG C, and then discharged, to avoid low temperature corrosion of flue gas wet flue, chimney wall, and can increase the lifting height of the flue gas. Gas gas heater is an important equipment for wet desulfurization, flue gas sulfur, the highest hot end due to high temperature, and the cold end temperature of the smoke is low water content, so the gas flue gas - gas heat exchanger for import and export shall be corrosion resistant materials, such as glass, Ke Denggang, heat transfer area general enamel steel.
The flue gas system consists of flue gas, flue gas baffle, seal fan and air heater (GGH). The inlet flue of the absorption tower and the flue outlet to the baffle, the flue gas temperature is low, the flue gas moisture content is large, and the flue gas is easy to corrode.The flue gas damper is an important equipment for the desulfurization unit to enter and exit, which is divided into FGD main flue gas baffle and bypass flue gas baffle. The former is installed in the import and export of the FGD system, which is composed of double layer flue damper. When the main flue is closed, the double layer flue gas damper is connected with the sealed air, so as to ensure that the anti-corrosion lining in the FGD system is not damaged. The inlet and outlet of the bypass damper is installed in the boiler flue. When the FGD system is running, the bypass flue is closed, and the flue is connected with the sealed air. The bypass flue damper is provided with a quick opening mechanism, which can ensure the normal operation of the boiler when the bypass flue is opened rapidly when the FGD system is in trouble.
