# US 9,433,874 B2 · Spray drying apparatus for dehydrated filtrate from desulfurization waste water, and air pollution control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,433,874 B2 - Document ID: US9433874B2 - Status: Granted - Kind: B2 - Application number: 15/089,911 - Filed: 2016-04-04 - Published: 2016-07-28 - Granted: 2016-09-06 - Earliest claimed: 2011-05-31 - Assignees: Mitsubishi Hitachi Power Systems, Ltd. - Applicants: Mitsubishi Hitachi Power Systems, Ltd. - Inventors: Toshihiro Fukuda; Tatsuto Nagayasu; Seiji Kagawa; Naoyuki Kamiyama; Nobuyuki Ukai - Web page: https://patentgrep.com/patent/US9433874B2 ## CPC - B01D 1/20: Sprayers (in general B05B) - B01D 1/18: to obtain dry solids (B01D1/24 takes precedence) - B01D 53/502: {characterised by a specific solution or suspension} - C02F 1/048: {Purification of waste water by evaporation} - C02F 1/12: Spray evaporation - B01D 2251/404: of calcium - C02F 2101/101: {Sulfur compounds} - C02F 2103/18: from the purification of gaseous effluents - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## Abstract A spray drying apparatus includes: a gas inlet provided in a side wall in the vicinity of a top (lid) portion of the spray drying apparatus, for introducing a flue gas for drying a spray of dehydrated filtrate; flow-adjusting plates provided in a body of the spray drying apparatus, for decelerating the introduced flue gas so as to change the flow of the flue gas to a laminar flow; a spray nozzle for spraying the dehydrated filtrate from the desulfurization waste water into the flue gas having been changed to the laminar flow; and a joining unit for joining a bottom portion of the body of the spray drying apparatus to a gas supply line that is a main flue gas duct for the flue gas so as to discharge spray-dried solids to the main flue gas duct. ## Claims ### Claim 1 A spray drying apparatus, comprising: a body portion, a top portion and a bottom portion; a gas inlet, for introducing a flue gas, being provided in the body portion; a spray nozzle for spraying waste water into the flue gas in order to evaporate and dry the waste water; and an outlet duct connected to the bottom portion of the spray drying apparatus, wherein the bottom portion of the spray drying apparatus is connected to a longitudinal intermediate portion of the outlet duct such that the flue gas discharged from the bottom portion is provided to a midstream of main flue gas flowing in the outlet duct. ### Claim 2 (depends on 1) The spray drying apparatus as set forth in claim 1, wherein the gas inlet being provided in the body portion in the vicinity of the top portion of the spray drying apparatus. ### Claim 3 (depends on 1) The spray drying apparatus as set forth in claim 1, wherein: the flue gas and spray-dried solids are discharged from the body portion to the outlet duct of the spray drying apparatus. ### Claim 4 (depends on 1) The spray drying apparatus as set forth in claim 1, wherein: the outlet duct and the body portion of the spray drying apparatus are configured so that the flow direction of the flue gas and spray-dried solids flow is perpendicular to the extending direction of the outlet duct. ### Claim 5 (depends on 1) The spray drying apparatus as set forth in claim 1, wherein: the outlet duct including a portion extending substantially orthogonal to the body portion. ### Claim 6 (depends on 1) The spray drying apparatus as set forth in claim 1, wherein: the outlet duct connected to the bottom portion of the spray drying apparatus being parallel to the gas inlet. ### Claim 7 (depends on 1) The spray drying apparatus as set forth in claim 1, further comprising: a plurality of plates provided in the body portion of the spray drying apparatus to change the flow of the flue gas. ### Claim 8 (depends on 1) The spray drying apparatus as set forth in claim 1 further comprising: a plurality of flow-adjusting plates configured to change the flow of the flue gas to a laminar flow. ### Claim 9 (depends on 7) The spray drying apparatus as set forth in claim 7, wherein each of the plurality of plates configured to change the flow of the flue gas. ### Claim 10 (depends on 8) The spray drying apparatus as set forth in claim 8, wherein: the plurality of the flow-adjusting plates being arranged vertically inside the body portion so that one end of each the plurality of the flow adjusting plates being close to an inner wall surface of the body portion. ### Claim 11 (depends on 8) The spray drying apparatus as set forth in claim 8, further comprising: a supply line for introducing the waste water provided in the body portion of the spray drying apparatus, wherein the plurality of the flow-adjusting plates being arranged around the supply line and fan out from the supply line in a radial direction towards an inner wall surface of the body portion. ### Claim 12 (depends on 1) The spray drying apparatus as set forth in claim 1, further comprising: a plurality of protective plates being provided along an inner wall surface of the body portion that is in the vicinity of a flue gas introduction area so as to prevent abrasion of the inner wall surface caused by solids contained in the flue gas. ### Claim 13 (depends on 12) The spray drying apparatus as set forth in claim 12, further comprising: a deceleration unit provided on each of the plurality of protective plates to decelerate the flow of the flue gas. ### Claim 14 (depends on 1) An air pollution control system comprising: a boiler for combusting fuel; an air heater for recovering heat of a flue gas supplied from the boiler; a precipitator for removing soot and dust contained in the flue gas from which heat has been recovered; a desulfurization device for removing a sulfur oxide contained in the flue gas, from which soot and dust have been removed, by an absorbent; a dehydrator for removing gypsum from desulfurization waste water discharged from the desulfurization device; the spray drying apparatus according to claim 1 including a spray unit for spraying dehydrated filtrate supplied from the dehydrator; and a flue gas introduction line for introducing a part of the flue gas to the spray drying apparatus. ### Claim 15 (depends on 14) The air pollution control system as set forth in claim 14, wherein the dehydrator being a centrifugal separator. ### Claim 16 A spray drying apparatus, comprising: a body portion, a top portion and a bottom; a gas inlet, for introducing a flue gas, being provided in the body portion in the vicinity of the spray drying apparatus; a spray nozzle for spraying waste water into the flue gas in order to evaporate and dry the waste water; and an outlet duct connected to the bottom of the spray drying apparatus, wherein the bottom portion of the spray drying apparatus is connected to a longitudinal intermediate portion of the outlet duct such that the flue gas discharged from the bottom portion is provided to a midstream of main flue gas flowing in the outlet duct, and wherein an upstream of the outlet duct is connected with an upstream of the gas inlet. ### Claim 17 (depends on 16) The spray drying apparatus as set forth in claim 16, wherein the gas inlet being provided in the body portion in the vicinity of the top portion of the spray drying apparatus. ### Claim 18 (depends on 16) The spray drying apparatus as set forth in claim 16, wherein: the flue gas and spray-dried solids are discharged from the body portion to the outlet duct of the spray drying apparatus. ### Claim 19 (depends on 16) The spray drying apparatus as set forth in claim 16, wherein: the outlet duct and the body portion of the spray drying apparatus are configured so that the flow direction of the flue gas and spray-dried solids flow is perpendicular to the extending direction of the outlet duct. ### Claim 20 (depends on 16) The spray drying apparatus as set forth in claim 16, wherein: the outlet duct including a portion extending substantially orthogonal to the body portion. ### Claim 21 (depends on 16) The spray drying apparatus as set forth in claim 16, wherein: the outlet duct connected to the bottom of the spray drying apparatus being parallel to the gas inlet. ### Claim 22 (depends on 16) The spray drying apparatus as set forth in claim 16, further comprising: a plurality of plates provided in the body portion of the spray drying apparatus to change the flow of the flue gas. ### Claim 23 (depends on 16) The spray drying apparatus as set forth in claim 16, further comprising: a plurality of flow-adjusting plates configured to change the flow of the flue gas to a laminar flow. ### Claim 24 (depends on 22) The spray drying apparatus as set forth in claim 22, wherein each of the plurality of plates configured to change the flow of the flue gas. ### Claim 25 (depends on 23) The spray drying apparatus as set forth in claim 23, wherein: the plurality of the flow-adjusting plates being arranged vertically inside the body portion so that one end of each the plurality of the flow adjusting plates being close to an inner wall surface of the body portion. ### Claim 26 (depends on 23) The spray drying apparatus as set forth in claim 23, further comprising: a supply line for introducing the waste water provided in the body portion of the spray drying apparatus, wherein the plurality of the flow-adjusting plates being arranged around the supply line and fan out from the supply line in a radial direction towards an inner wall surface of the body portion. ### Claim 27 (depends on 16) An air pollution control system comprising: a boiler for combusting fuel; an air heater for recovering heat of a flue gas supplied from the boiler; a precipitator for removing soot and dust contained in the flue gas from which heat has been recovered; a desulfurization device for removing a sulfur oxide contained in the flue gas, from which soot and dust have been removed, by an absorbent; a dehydrator for removing gypsum from desulfurization waste water discharged from the desulfurization device; the spray drying apparatus according to claim 16 including a spray unit for spraying dehydrated filtrate supplied from the dehydrator; and a flue gas introduction line for introducing a part of the flue gas to the spray drying apparatus. ### Claim 28 (depends on 27) The air pollution control system as set forth in claim 27, wherein the dehydrator being a centrifugal separator. ### Claim 29 (depends on 9) The spray drying apparatus as set forth in claim 9, wherein: the plurality of the plates include flow-adjusting plates and/or protective plates. ### Claim 30 (depends on 24) The spray drying apparatus as set forth in claim 24, wherein: the plurality of the plates include flow-adjusting plates and/or protective plates.