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Wednesday, July 29, 2020 | History

2 edition of Disposal of spent sorbent from dry FGD processes found in the catalog.

Disposal of spent sorbent from dry FGD processes

P. M Stephan

Disposal of spent sorbent from dry FGD processes

by P. M Stephan

  • 252 Want to read
  • 36 Currently reading

Published by U.S. Environmental Protection Agency, Industrial Environmental Research Laboratory, Center for Environmental Research Information [distributor] in Research Triangle Park, NC, Cincinnati, OH .
Written in English

    Subjects:
  • Flue gases -- Desulfurization

  • Edition Notes

    StatementP.M. Stephan, H.S. Rosenberg, and R.B. Bennett
    ContributionsRosenberg, Harvey S, Bennett, R. B, Industrial Environmental Research Laboratory (Research Triangle Park, N.C.)
    The Physical Object
    Pagination7 p. :
    ID Numbers
    Open LibraryOL14892001M

    Critical to this process is production of correctly-sized lime slurry droplets and proper residence time such that the particulates are dry but well-reacted when reaching the ESP or fabric filters. FGD PRODUCTS Many different products from the various FGD processes, primarily: Lime/limestone force oxidized (LSFO) = Calcium sulfate dihydrate (gypsum) Lime/limestone unoxidized = Calcium sulfite Fluidized bed ash and dry scrubbers = mixtures of char/fly ash and spent bed material or sorbent containing CaO, CaSO 4, CaSO 3 and ash Wet ammonia.

    Unfortunately, there is no market for the by-products, whereas saleable gypsum is produced in the limestone wet scrubbing processes. Disposal of the by-products can be expensive. Dry Technologies. Dry sorbent injection processes offer the least water consumption of the FGD processes discussed. The invention relates to a method for treating a waste absorbent fine powder (calcium sulfite and calcium sulfate as major ingredients in it) produed in a process of flue gas desulfurization by pyrogenic process. The absorbent containing a small amount of binder is oxidized at a temperature of range deg.C to deg.C in a fluidized-bed reactor to obtain a dry spherical product-calcium Author: 安吉文, 本特森, 库迪治斯.

    The major environmental concerns with direct disposal are heat release, sulfide, pH, calcium, SO., and IDS. The major environmental concerns with disposal after processing are pH, calcium, SO, and IDS. On the basis of these results, spent sorbent processing will be required for nonhazardous disposal. The proceedings document presentations at the First Combined FGD and Dry SO₂ Control Symposium, in St. Louis, MO, October 25 - 28, The objective of the symposium was the exchange of technical and regulatory information on sulfur oxide control technology, including wet and dry scrubbers, emerging processes, and international developments in clean coal/acid rain technologies.


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Disposal of spent sorbent from dry FGD processes by P. M Stephan Download PDF EPUB FB2

The primary problem associated with the dry injection FGD process using sodium compounds is disposal of the spent sor- bent This reacted sorbent containing sodium sulfate and sodium sulfite formed in the reaction with the S02 in the flue gases, is highly water soluble and has a high potential for leaching into gound water if disposal is via unlined landfill.

Get this from a library. Disposal of spent sorbent from dry FGD processes. [P M Stephan; Harvey S Rosenberg; R B Bennett; Industrial Environmental Research Laboratory (Research Triangle Park, N.C.)].

Final report Oct Jan 81}, author = {Stephan, J M and Rosenberg, H S and Bennett, R B}, abstractNote = {The report gives results of a study of sintering and leaching mechanisms of fly ash/spent sodium sorbent mixtures from a dry injection flue gas desulfurization (FGD) process.

°F) (FETC, ). For spray dry systems, the temperature of the flue gas exiting the absorber must be 10°C to 15°C (20°F to 30°F) above the adiabatic saturation temperature. Optimal temperatures for SO 2 removal for dry sorbent injection systems range from °C to °C (°F to °F).

Optimal temperatures for SO 2File Size: 33KB. Filling dry sorbent from tanks for transport to disposal site Sorbent from the dry FGD system is removed from the collection hoppers and then transported by trucks to disposal sites. The LMS 2D laser scanner ensures that the loading spouts are correctly positioned and no sorbent can escape into the atmosphere during the loading process.

Non-regenerable processes: dry methods: Flue gas desulfurization process: Sorbent/additives: SO 2 removal efficiency: Final product/s: Remarks: Reference: Lime spray drying: Lime slurry: Up to 98%: CaSO 3: SO 2 absorption efficiency strongly depends on the ratio of the water evaporation rate to the absorption rate: Hill and Zank,Babcock and Wilcox, Cited by: 2.

Sorbent used in an economizer sorbent injection process (ESI) is hydrated lime. When flue gas flows through the economizer zone its temperature remains between K and K. At this temperature range when sorbent is sprayed into the flue-gas stream Ca(OH) 2 reacts with SO 2 to produce CaSO 3 instead of CaSO 4.

chemical and mineralogical characteristics of the reacted and unreacted sorbent. Dry FGD materials contain higher concentrations of calcium and sulfur and lower concentrations of silicon, aluminum, and iron tha n fly ash. HANDLING OF FGD MATE RIAL Both wet and dry materials are produced wet in the scrubbers and are thenFile Size: 95KB.

Many different products from the various FGD processes, primarily: – Lime/limestone force oxidized (LSFO) = Calcium sulfate dihydrate (gypsum) – Lime/limestone unoxidized = Calcium sulfite – Fluidized bed ash and dry scrubbers = mixtures of char/fly ash and spent bed material or sorbent containing CaO, Size: KB.

However, if a solidifying absorbent isn’t the right tool, absorbent products like socks, rolls and pads become necessary. When it comes to disposal of spent absorbents products like socks, rolls and pads, it becomes complicated because regulations are different state to state.

Dissolution kinetics of sorbents and effect of additives in wet FGD Sorbents for FGD processes There is a wide range of sorbents used for FGD processes.

Dry sulfurization processes offer the significant advantages of low capital and low operating costs when compared to wet desulfurization. They hold great potential for the economical reduction of sulfur emissions from power utilities that use high-sulfur coal.2/5(1).

Flue Gas Desulfurization: The State of the Art. the spent sorbent is disposed of as a waste. A schematic of dry FGD processes involving dry powder in. 7. Flue-gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO2) from exhaust flue gases of fossil- fuel power plants, and from the emissions of other sulphur oxide emitting processes.

It is a control device that absorbs and react using the alkaline reagent to produce a solid compound. REVIEW OF HANDLING AND USE OF FGD MATERIAL INTRODUCTION Flue gas desulfurization (FGD) material is one of the “four large-volume wastes from the combustion of coal by electric utility power plants” as defined by the U.S.

Environmental Protection Agency (EPA) (Federal Register; Code of Federal Regulations, PartTitle 4). Dry sorbent injection may serve as a key pollution control technology at power plants Source: U.S.

Energy Information Administration. Dry sorbent injection (DSI) is a pollution control technology that may play a role in the United States' electric power sector's compliance with the Mercury and Air Toxics Standards (MATS).

In this process, a sorbent is pulverized and injected as a dry powder into the flue gas stream upstream of a baghouse. The material collects on the surface of the bags and reacts with the SO/sub 2/ in the flue gas to form a solid product which is subsequently disposed more» with the collected fly ash.

The Best Demonstrated Available Technology (BDAT) for reducing SO 2 emissions is wet scrubber flue gas desulfurization (FGD) systems. These systems are designed to introduce an alkaline sorbent consisting of lime or limestone (primarily limestone) in a spray.

In a dry FGD process, particles of an alkaline sorbent are injected into a SO2-containing flue gas, producing a dry solid byproduct. Regenerable and non-regenerable systems. Dry Sorbent Injection for SO 2 Control Cost Development Methodology Page 3 Units with a baghouse and limited NOx control that target a high SO 2 removal efficiency with sodium sorbents may experience a brown plume resulting from the conversion of NO to NO 2.

The formation of NO 2 would then have to be addressed by adding adsorbent into the flue. The Growth of Dry Sorbent Injection (DSI) and the impact on Coal Combustion Residue. Michael D. Schantz 1, Melissa Sewell 2. are inconsistent with the marketing of the FGD process synthetic gypsum and therefore require additional processing or disposal of the scrubber Size: KB.SO2 removed in the dry sorbent duct injection system took place in the FF when conventional hydrated lime [Ca(0H)2] was the sorbent.

These results indicate that a new flue gas desulfurization (FGD) installation using dry sorbent duct injection would favor the use of a FF for particulate collection. However, most existing power plants are.• Other sorbents such as activated carbon or sodium tetrasulfide can be added to the reactor to remove mercury and or dioxins in a single application.

• When hydrated lime is employed as the sorbent it can be injected dry. • Both quicklime and hydrated lime can be used as the primary Size: 1MB.