摘要:
A flue gas control system of a coal combustion boiler according to the present invention includes: an HCI atomizer (32) that sprays hydrogen chloride (33) to flue gas from a coal combustion boiler (11) that uses coal as a fuel (F); NOx removing apparatus (13) that removes nitrogen oxides by ammonia denitration by adding ammonia (12) to the flue gas after spraying hydrogen chloride and oxidizes mercury; an air preheater (14) that recovers heat in the gas after removal of nitrogen oxides; a precipitator (15) that removes particulates in the gas; an activated carbon atomizer (22) that sprays activated carbon (22a) into the gas after particulate collection; a bag filter (21) that collects activated carbon having adsorbed mercury; a desulfurizer (16) that removes sulfur oxides in the flue gas after removal of activated carbon; a stack (17) that discharges the gas which has undergone desulfurization to outside; and an ORP meter (19) that measures an oxidation reduction potential for feeding air to a slurry absorbent in the desulfurizer (16).
摘要:
An air pollution control system for a coal combustion boiler includes: a NOx removing apparatus that reduces nitrogen oxide contained in flue gas emitted from this coal combustion boiler, an air pre-heater that recovers heat in the gas, a precipitator 15 that reduces particulates from the gas, a liquid-gas contact type desulfurizer that removes sulfur oxide by way of a limestone-gypsum method and reduces mercury oxide in the gas, a stack that releases the gas after SOx removal to the exterior, and a solid-liquid separator that extracts limestone-gypsum containing slurry from the desulfurizer to the exterior and performs a solid-liquid separation, where water separated in the solid-liquid separator is removed, and concentrated slurry is sent back to the bottom of the desulfurizer to make the gypsum concentration of slurry equal to or higher than 10 percent in the desulfurizer.
摘要:
An air pollution control system for a coal combustion boiler according to the present invention includes: a NOx removing apparatus (13) that removes nitrogen oxide contained in flue gas emitted from this coal combustion boiler (11) by adding ammonia (12) thereto, an air pre-heater (14) that recovers heat in the gas after the nitrogen oxide is removed, a precipitator (15) that reduces particulates from the gas after the heat is recovered, a gas-liquid contact type SOx removing apparatus (16) that removes sulfur oxide by way of a limestone-gypsum method and reduces mercury oxide in the gas after the particulates are reduced, and a stack (17) that releases purified gas after the sulfur and the mercury are reduced, where an oxidant is added to limestone-gypsum containing slurry (21) in or extracted from the SOx removing apparatus (16).
摘要:
A flue gas control system of a coal combustion boiler comprises an HCl atomizer that sprays hydrogen chloride to flue gas from a coal combustion boiler that uses coal as a fuel; NOx removing apparatus that removes nitrogen oxides by ammonia denitration by adding ammonia to the flue gas after spraying hydrogen chloride and oxidizes mercury; an air preheater that recovers heat in the gas after removal of nitrogen oxides; a precipitator that removes particulates in the gas; an activated carbon atomizer that sprays activated carbon into the gas after particulate collection; a bag filter that collects activated carbon having adsorbed mercury; a desulfurizer that removes sulfur oxides in the flue gas after removal of activated carbon; a stack that discharges the gas which has undergone desulfurization to outside; and an ORP meter that measures an oxidation reduction potential for feeding air to a slurry absorbent in the desulfurizer.
摘要:
An air pollution control system for a coal combustion boiler according to the present invention includes: a NOx removing apparatus (13) that reduces nitrogen oxide contained in flue gas emitted from this coal combustion boiler (11), an air pre-heater (14) that recovers heat in the gas, a precipitator 15 that reduces particulates from the gas, a liquid-gas contact type desulfurizer (16) that removes sulfur oxide by way of a limestone-gypsum method and reduces mercury oxide in the gas, a stack (17) that releases the gas after SOx removal to the exterior, and a solid-liquid separator (22) that extracts limestone-gypsum containing slurry (21) from the desulfurizer (16) to the exterior and performs a solid-liquid separation, where water (23) separated in the solid-liquid separator (22) is removed, and concentrated slurry (24) is sent back to the bottom of the desulfurizer (16) to make the gypsum concentration of slurry (25) equal to or higher than 10 percent in the desulfurizer (16).
摘要:
An air pollution control system comprises: a carry-in tank truck that carries in a feedstock, i.e., concentrated hydrochloric acid (35% hydrochloric acid); a hydrogen chloride vaporizer that vaporizes the concentrated hydrochloric acid to obtain hydrogen chloride; a liquid level regulator that separates residual hydrogen chloride from extracted dilute hydrochloric acid discharged as a by-product from the hydrogen chloride vaporizer, and that regulates the liquid level of the hydrogen chloride vaporizer; a concentration regulating tank that regulates the hydrochloric acid concentration of extracted dilute hydrochloric acid 25B from which the residual hydrogen chloride has been separated to a predetermined concentration (e.g., 22%); a by-product tank that stores therein dilute hydrochloric acid regulated to have a predetermined concentration; and a carry-out tank truck that carries out the dilute hydrochloric acid with a predetermined concentration discharged from the by-product tank.
摘要:
An air pollution control system 10A according to the present invention includes: a boiler 11 that burns fuel; NOx removal equipment 12 that decomposes nitrogen oxides in flue gas 25 discharged from the boiler 11; a desulfurizer 15 that causes sulfur oxides in the flue gas 25 having passed through the NOx removal equipment 12 to be absorbed by an absorbent, thereby reducing sulfur oxides in the flue gas 25, a waste-water treatment device 16 including a solid-liquid separating unit 31 that separates desulfurized waste water 28 discharged from the desulfurizer 15 into a solid fraction and a liquid fraction, and a mercury removing unit 32 that removes mercury in the desulfurized waste water 28; and a treated waste-water returning unit (a makeup water line) 17 that returns at least a part of treated waste water 40 treated by the waste-water treatment device 16 to the desulfurizer 15.
摘要:
A mercury reduction system includes an NH4Cl supplying unit that sprays an NH4Cl solution into a flue of the boiler, a reduction denitration apparatus that includes a denitration catalyst for reducing NOx in the flue gas with NH3 and oxidizing Hg in the presence of HCl, and a wet desulfurization apparatus for reducing Hg oxidized in the reduction denitration apparatus with limestone-gypsum slurry. The NH4Cl supplying unit includes an NH4Cl solution feed pipe that supplies the NH4Cl solution into the flue in a liquid state, a blow pipe that is inserted into the flue so as to surround the NH4Cl solution feed pipe and through which air is injected into the flue, and a two-fluid nozzle that is fitted to an end of the NH4Cl solution feed pipe and through which the NH4Cl solution is injected. Through the two-fluid nozzle, the NH4Cl solution is injected and sprayed in fine liquid droplets. NH3 is supplied by an ammonia supplying unit and HCl is supplied by a hydrogen chloride supplying unit wherein both units are located between the NH4Cl agent supplying unit and the reduction denitration apparatus.
摘要:
A control system of a NOx removal device is provided with reagent introducing means for introducing a reagent into a fluid, a temperature measuring device that measures a temperature distribution of the fluid, a reagent-concentration calculating portion that calculates a concentration distribution of the reagent introduced into the fluid with the temperature distribution determined at the temperature measuring device, a reagent-flow-rate determining portion that determines a flow rate of the reagent that the reagent introducing means introduces in accordance with the concentration distribution calculated at the reagent-concentration calculating portion, and a reagent-introducing-means control portion that controls the reagent introducing means so as to introduce the reagent into the fluid at the flow rate determined at the reagent-flow-rate determining portion.
摘要:
A mercury reduction system according to the present embodiment is a mercury reduction system that reduces NOx and Hg in flue gas discharged from a boiler, and includes a chemical supplying unit that mixes an NH4Cl solution, an NH3 solution, and an HCl solution in liquid states, and supplies a mixed solution into a flue provided downstream of the boiler, a reduction denitration apparatus that includes a denitration catalyst reducing NOx in the flue gas with NH3 and oxidizing Hg in the presence of HCl, and a wet desulfurization apparatus that reduces Hg oxidized in the reduction denitration apparatus with limestone-gypsum slurry.