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Sorbent injection system - Combustion Engineering, Inc

In a furnace (10) in which a sulfur-bearing fuel is burned, a sorbent material such as limestone is introduced into the upper portion of the furnace through a plurality of nozzle arrangements (40) Ea...

US6372187B1 - Alkaline sorbent injection for mercury ,

A mercury removal system for removing mercury from combustion flue gases is provided in which alkaline sorbents at generally extremely low stoichiometric molar ratios of alkaline earth or an alkali metal to sulfur of less than 10 are injected into a power plant system at one or more locations to remove at least between about 40% and 60% of the mercury content from combustion flue gas...

Influence of Sorbent Characteristics on Fouling and ,

Sorbent limestone is used widely in CFB boilers effectively to control sulfur dioxide emissions Hard deposits were formed in backpass of CFB boiler while using high sulfur Indian lignite and limestone sorbent to control SO 2 In addition large quantum of loose deposits caused severe blocking of ,...

US6528030B2 - Alkaline sorbent injection for mercury ,

A mercury removal system for removing mercury from combustion flue gases is provided in which alkaline sorbents at generally extremely low stoichiometric molar ratios of alkaline earth or an alkali metal to sulfur of less than 10 are injected into a power plant system at one or more locations to remove at least between about 40% and 60% of the mercury content from combustion flue gas...

In-Furnace Sulfur Capture by Cofiring Coal With Alkali ,

Mar 08, 2017· The alkali/sulfur molar ratios were chosen to correspond to stoichiometric proportions (Ca/S = 1, Mg/S = 1, Na 2 /S = 1, and K 2 /S = 1) and the effectiveness of each alkali or alkali earth based sorbent was evaluated separately Combustion of coal took place in a drop-tube furnace, electrically heated to 1400 K under fuel-lean conditions...

Flue-gas desulfurization - Wikipedia

SO 2 is an acid gas, and, therefore, the typical sorbent slurries or other materials used to remove the SO 2 from the flue gases are alkaline The reaction taking place in wet scrubbing using a CaCO 3 slurry produces calcium sulfite (CaSO 3) and may be expressed in the simplified dry form as: CaCO 3 (s) + SO 2 (g) → CaSO 3 (s) + CO 2 (g) When wet scrubbing with a Ca(OH) 2 (hydrated lime ....

Analysis and design of a calcium-based sulfur sorbent for ,

Hasler, David Johann Ludwig, "Analysis and design of a calcium-based sulfur sorbent for applications in integrated gasification combined cycle energy systems " (2003)Retrospective Theses and Dissertations 1436 , 321 Comparison between limestone and plaster of Paris 56...

Reactivation of limestone sorbents in FBC for SO2 capture ,

Apr 01, 2007· Ideally, a sorbent reactivation process ought to bring the level of activity of the unreacted portion of the sorbent back to that of the original unreacted limestone In practice, for “good” limestone sorbents in CFBC boilers 90% sulphur capture can be achieved with a Ca:S molar ratio of ∼2–25 (ie, ∼35–45% utilization of the CaO)...

Reaction of sulfur dioxide with limestone and the grain ,

Experimental measurements of the reaction of sulfur dioxide and oxygen with limestones have demonstrated substantial influence of the geologic origin of the stone, its porosity and particle size, gaseous concentration of sulfur dioxide, and temperature on the course of reaction and the conversion (that is, the degree of utilization of the limestone content of the particles as a sorbent for ....

Pore Distribution Changes of Calcium-Based Sorbents ,

Sorbents Reacting with Sulfur Dioxide Changes in the pore structure of calcium oxide sorbents derived from calcium carbonate (c-CaO) and calcium hydroxide (h-CaO) reacting with sulfur dioxide are determined Results show that the pore shape of c- CaO approximates a cylinder while that of h-CaO appears to be slit- or platelike...

Characterization of a limestone in a batch fluidized bed ,

A calcium based sorbent from Spain, “Granicarb limestone”, in narrow particle size intervals between 02 and 063 mm, was used for the experimental work Chemical composition and physical properties of this sorbent are showed in the Table 1 As can be seen the “Granicarb” raw limestone is mainly composed of calcium carbonate...

Multiple reactor testing of a synthetic sorbent for ,

A new synthetic regenerable sorbent was developed as an alternative to limestone and dolomite for regenerative sulfur capture in fluidized bed combustion (FBC of coal The sorbent consists of CaO (8-9 wt%) on a spherical 3 mm diameter γ-Al2O3 support A shrinking unreacted core model (SURE2) is proposed to describe the sulfation process Experiments have been carried out in a 12 mm internal ....

Rocks and Minerals/Identification List - Wiki - Sciolyorg

Apr 24, 2021· Used in acid neutralization, as a low-hardness abrasive, soil conditioner, heated for the production of limestone and marble, and in monuments and calcium carbonate sorbents,...

EVALUATION OF LIMESTONE IMPURITIES IN THE ,

sorbents used for the removal of sulfur compounds (SOx) emitted in the combustion of coal in power generation The future installation of a thermoelec-tric plant using fluidized bed technology in southern Brazil, a region of huge coal reserves, is expected The fact that this plant will use limestone as a sorbent of sulfur emissions boosted ....

Process for recovery of sulfur from acid gases - OSTIGOV

May 01, 1993· Abstract Limestone can be used more effectively as a sorbent for H 2 S in high-temperature gas-cleaning applications if it is prevented from undergoing calcination Sorption of H 2 S by limestone is impeded by sintering of the product CaS layer Sintering of CaS is catalyzed by CO 2, but is not affected by N 2 or H 2The kinetics of CaS sintering was determined for the temperature range 750 ....

In situ desulfurization during combustion of high-sulfur ,

Limestone was used as sorbent and mixed with coal physically for sulfur removal In addition, another sorbent, calcium acetate, synthesized from natural limestone, was also used for in situ ....

USGS Fact Sheet 076-01: Coal Combustion Products

Their goal is to chemically combine the sulfur gases released in coal combustion by reacting them with a sorbent, such as limestone (calcium carbonate, CaCO 3), lime (calcium oxide, CaO), or ammonia (NH 3) Of the FGD systems in the United States, 90 percent use limestone or lime as the sorbent (fig 2)...

WRI-05-R013 OPTIMIZATION OF TRONA/LIMESTONE ,

Tests were performed where sorbents were both injected into the furnace and added to the coal The sorbents tested were limestone, trona, and an 80:20 limestone/trona blend Table I summarizes the test conditions Sorbent Injection Rates Injection Locations Limestone ,...

limestone function in coal fire boiler – CFBC Boiler ,

In a CFB boiler, limestone injection is used to capture SO2 from flue gas May 3, 2011 High Sulfur Lignite Fired Large CFB Boilers-Design and Operating Experience successful operation firing low-ash, high-moisture Indonesian coal with unburnt Solid System (Fuel, Bed Material, Limestone & Ash System) Energy Requirements of a Limestone FGD System...

A New Life For Coal Ash - C&EN

Feb 15, 2016· In the case of sulfur, when the flue gas contacts a calcium-based sorbent such as limestone in a scrubber, the reaction forms hydrated calcium sulfate (CaSO 4 ,...

FLASH CALCINATION OF LIMESTONE IN A BENCH-SCALE ,

production cost of quicklime sorbent for dry sorbent injection (DSI) applications In this research, a bench-scale SAP unit (2 kg/hr limestone feed rate) was used to prepare quicklime from two limestone sampl The impacts of particle size, surface morphologies of...

FLASH CALCINATION OF LIMESTONE IN A BENCH-SCALE ,

production cost of quicklime sorbent for dry sorbent injection (DSI) applications In this research, a bench-scale SAP unit (2 kg/hr limestone feed rate) was used to prepare quicklime from two limestone sampl The impacts of particle size, surface morphologies of...

Characterization of a limestone in a batch fluidized bed ,

Sep 01, 2011· A calcium based sorbent from Spain, “Granicarb limestone”, in narrow particle size intervals between 02 and 063 mm, was used for the experimental workChemical composition and physical properties of this sorbent are showed in Table 1As can be seen the “Granicarb” raw limestone is mainly composed of calcium carbonate...

Influence of Sorbent Characteristics on Fouling and ,

Sorbent limestone is used widely in CFB boilers effectively to control sulfur dioxide emissions Hard deposits were formed in backpass of CFB boiler while using high sulfur Indian lignite and limestone sorbent to control SO 2 In addition large quantum of loose deposits caused severe blocking of ,...

what's new in high temperature sulfur removal systems for ,

Sorbent Selection Both limestone (CaCOa) and dolomite (MgCa(CO3)2) can be used as sulfur sorbents under full gasification condi-tions at high fuel temperatures, but laboratory studies show that there are several factors that restrict their use under specific design conditions and that affect both the desulfurization process and the overall ....

Microbial stabilization of sulfur-laden sorbents ,

Clean coal technologies that involve limestone for in situ sulfur capture generate lime/limestone products laden with sulfur at various oxidation stat If sulfur is completely stabilized as sulfate, the spent sorbent is ready for commercial utilization as gypsum However, the presence of reduced sulfur species requires additional processing Thermal oxidation of reduced sulfur frequently ....

limestone function in coal fire boiler – CFBC Boiler ,

In a CFB boiler, limestone injection is used to capture SO2 from flue gas May 3, 2011 High Sulfur Lignite Fired Large CFB Boilers-Design and Operating Experience successful operation firing low-ash, high-moisture Indonesian coal with unburnt Solid System (Fuel, Bed Material, Limestone & Ash System) Energy Requirements of a Limestone FGD System...

Effect of characteristic of sorbents on their sulfur ,

May 01, 2004· 1 IntroductionCalcium-based sorbents such as limestone (CaCO 3) and dolomite (CaMg(CO 3) 2) are widely used for removing of sulfur dioxide in fluidized bed combustion (FBC) of coal or other sulfur containing fuelsTwo steps can describe the reactions between limestone and sulfur dioxide (1) CaCO 3 → CaO + CO 2 (2) CaO + SO 2 +1/2 O 2 → CaSO 4 During FBC, usually in the ,...

EVALUATION OF LIMESTONE IMPURITIES IN THE ,

sorbents used for the removal of sulfur compounds (SOx) emitted in the combustion of coal in power generation The future installation of a thermoelec-tric plant using fluidized bed technology in southern Brazil, a region of huge coal reserves, is expected The fact that this plant will use limestone as a sorbent of sulfur emissions boosted ....

Study and modeling of the reduction of sulfur dioxide ,

By using the selected limestone and additives the simultaneous SO2/NO, removal was also measured Several ammonium salts as well as urea were tested Urea was found to give the highest NO, removal efficiency By urea-limestone sorbent, 90% SO2 removal and 80% NO, removal were obtained at Ca/S and N/ NOx ratios both equal to 2...

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