Effect Of Sulphur On Limestone

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 …

Request PDF | The effect of sintering on sulphur capture by limestone and dolomite | In-bed sulphur capture is an attractive method for reducing SO2 emissions from coal-fired IGCC power plants.

The effect of the presence of SO 2 /H 2 O in the carbonator atmosphere on the CO 2 capture capacity and sorbent attrition has been investigated by this research group in previous articles [14, 15].It has been shown that SO 2 and H 2 O can promote CaO sulphation and carbonation, respectively, making the outer shell of the particle harder, hence more resistant to …

Water was shown to have a significant promotional effect on sulphation, especially in the diffusion-controlled stage. However, the effect of water during the kinetic-controlled …

Although sulfur-based autotrophic denitrification has been already explored, comprehensive analyses of the effects of two different alkalinity sources (siderite and limestone) on sulfur-based denitrification processes under controlled conditions were carried out in …

When sulfurous, sulfuric, and nitric acids in polluted air and rain react with the calcite in marble and limestone, the calcite dissolves. In exposed areas of buildings and statues, we see roughened surfaces, removal of material, and loss of carved details. Stone surface material may be lost all over or only in spots that are more reactive. You might expect that sheltered areas …

Despite the great potential of sulfur-based autotrophic denitrification, an improvement in nitrate removal rate is still needed. This study used the desulfurized products of Mn ore to develop the MnS-S 0-limestone autotrophic denitrification system (MSLAD).The feasibility of MSLAD for denitrification was explored and the possible mechanism was proposed.

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 …

Abstract. In-bed sulphur capture is an attractive method for reducing SO 2 emissions from coal-fired IGCC power plants. Sulphur (H 2 S) capture efficiency is dependent upon four competing rates: (i) calcination of sorbent to the oxide with concomitant surface area growth, (ii) sintering of the oxide with an associated decrease in surface area, (iii) sulphiding of …

Limestone is found in many forms and is classified in terms of its origin, chemical composition, structure, and geological formation. The key requirements in specifying a limestone are that the limestone should have an acceptable "reactivity" with respect to the reaction with sulphur dioxide and a high %CaCO 3.

The objectives were (1) to determine the effect of reactive media conditions (i.e., sulfur granule size and the ratio of sulfur to limestone) and (2) to investigate the effect of co-contaminants (i.e., TCE or heavy metals) on sulfur-based autotrophic denitrification.

This was done to understand effect of different operating parameters of feed and their interaction effects on performance of Falcon separator. It was found that gravity force and water pressure have significant effect on both pyrite …

Similar effect of influent DO concentration on the electron flux from elemental sulfur oxidation was repeated at an influent nitrate concentration of 10 mg-N/L (Fig. S4b). These findings suggested that the efficient utilization of elemental sulfur could be enhanced by larger influent nitrate concentration and reduced influent DO concentration.

Effect of sulfur/limestone ratios on nitrate–nitrogen removal efficiency, pH and sulfate production. Data presented are average value of five replicates with the sample standard deviation. Bars on symbols indicate sample standard …

In a properly operated new suspension preheater (NSP) cement line, the SO 2 emission is mainly originated from sulfides in the raw meal, and limestone, occupying about 85% wt. of the raw meal, is the dominant sulfur source. However, the sulfur characteristics of limestones and then their influences on the SO 2 emission have not been clarified yet. In the …

Among the several efficient methods for in combustion sulfur dioxide removal methods, sulfation with carbonate based systems are the most widely used one due to its low cost.

Limestone particle size has a crucial influence on SO2 capture efficiency, however there are few studies on the sulfation reactivity, which covers a broad range of particle sizes at low SO2 concentrations. In this paper, a …

Sulphur capture in atmospheric FBC systems is strongly influenced by temperature, typically with a maximum sulphur capture efficiency occurring at about 850 °C [6], [7].However, there exists considerable variation in the actual temperature depending on the type of limestone and the FBC unit [8].

Sulfur particles were irregular in shape with diameter ranging from 4 to 4.75 mm and porosity from 48 to 50%. The ceramic beads and granular activated carbon (GAC) particles used in columns 4 and 6, respectively, were similar in size to the sulfur particles. To prevent the effect of phototrophic bacteria, the columns were covered with a dark cloth.

Numerous researchers have investigated the effects of various buffering additives on the desulfurization of limestone slurries. Commercially available buffering additives include organic additives, such as benzoic, adipic, formic, acetic, and citric acids, and inorganic additives, such as sodium, ammonium, and sulfate salts [4], [14], [16].The higher pH buffering capacity …

The effects of operating conditions (linear gas velocity, molar ratio, type of coal and limestone, etc.) on sulfur retention efficiency in a circulating fluidized bed combustor were studied.

Since limestone used for sulphur capture in CFB typically has wide particle size distribution (from a few micrometres to about 1000 lm), sulphation tests were also conducted using three additional particle size ranges for the Kelly Rock limestone (125– 150 lm, 150–250 lm, 250–425 lm), to determine if particle size influenced the effect of ...

Scab was greatly reduced in infested Leon fine sand, prairie phase, by treating with sulfur, but the pH reactions established were not suitable for the best growth of potatoes. Consequently, the advantages of controlling the disease by such a treatment may be nullified by loss in yield of potatoes grown in the sulfured soil.Scab was also reduced but not eliminated from the first …

A large-capacity TGA was developed in this paper to investigate the effects of limestone particle size on the sulfation reactivity at low SO 2 concentrations, which showed a better measurement performance of the …

To better understand the sulfur capture process during fluidized bed combustion, the reaction between sulfur dioxide and limestone has been investigated under periodically …

Limestone, applied as a slurry, which is a mixture of minutely crushed limestone and water, helps to prevent sulfur dioxide from escaping through the plant's smokestack. The limestone traps the sulfur dioxide gas in the wet slurry with calcium and oxygen and makes the pollutant a removable solid waste. ... "The Benefits And Effects Of Limestone ...

The ability of Na2CO3 and NaCl to enhance the sulfur capture capacity of three limestones was evaluated via fixed-bed calcination and sulfation experiments. The tested …

The effect of alkalis, sulphur and ash particles on inter-granular melt formation was not studied here, but problems may arise from the high sulphur load leading to partial melt formation of FeO–FeS at 915 °C (Iljana et al., 2013, Verein Deutscher Eisenhüttenleute, 1981). Furthermore, this means that the numerical results of reduction ...

The aim of this study is to develop an integrated model for SO 2 absorption into limestone slurry consisting of four sub-models, namely, absorption of SO 2; desorption of CO 2; dissolution of limestone and crystallization of calcium sulphite hemihydrate.The secondary objective of this study is to characterize regimes of SO 2 chemical absorption during SO 2 …

The SO 2 emission was also affected by the furnace temperature [12, 13], gas atmosphere [14, 15], fluidization velocity [16], etc. L.A.C.Tarelho et al. [17] analyzed the effects of air staging, excess air coefficient and limestone on SO 2 concentration in a pilot scale fluidized bed. They found that in the air classification experiment without limestone, SO 2 emission …