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The desulfurization effect is obvious, but the reaction period is long, so it is more suitable for small and medium-sized desulfurization plants. Rongxing. Home ... the raw petroleum coke contains a certain amount of raw material sulfur. In combination with high-temperature oxidation, about 10 ~ 30% of sulfur will combine with chemical action ...The desulfurization efficiency of the system increased as the reaction temperature decreased, it improved from 35% to 90% as the mass flow rate of the sprayed water increased from 0 to 10 kg/h, and it increased from 65.6% to 82.7% as Ca/S increased from 1.0 to …
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The semi-dry desulphurisation process is particularly suitable for systems up to 1 million Nm 3 /h flue gas. To purify the gases from SOx, but also from other acid components like HCl and HF, an aqueous absorbent (e.g. lime slurry) is injected into the spray absorber. The acidic harmful gases react with the absorbent to form salts, while at the ...The total mass loss of RM is 9.1 % in the temperature range of 25 °C −1000 °C. The first mass loss takes place between 25 °C and 223 °C, which can be related to the evaporation of free water and decomposition of gibbsite. Mass loss in 223–985 °C can then be assigned to the decomposition of gothite and calcite.
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Semidry desulfurization process with in situ supported sorbent preparation was studied. The effects of bed inventory, slurry sprayer height above the distributor, and slurry spray method on desulfurization efficiency were tested. The results showed that desulfurization efficiency for 28 kg of bed inventory could reach 98.84% for Ca/S molar ratio of 2.5. This result was …The invention relates to a sintering flue gas semi-dry desulfurization ash autoclaved brick and a production method therefor. The method comprises the following steps: sintering flue gas semi-dry desulfurization ash is subjected to catalytic oxidation at a low temperature; the treated desulfurization ash, stone chips, fly ash and/or cement are stirred in a stirrer; water is added; …
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For example, when Ca/S is 1.2, approaching to saturation temperature is 15-18 K, the diameter of sorbent is 64 μm, CaCO3 slurry is activated by CO2 in 3 hours, the desulfurization efficiency of ...FSI + Q METHOD (SEMI-DRY). Within this method, flue gas desulfurization process is carried out in two stages. Stage I - desulfurization process is similar to this, observed in dry method, i.e. pulverized sorbent is injected into the area with temperatures which are optimal for calcination and bonding of S02 in furnace chamber.
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The SO 2 removal efficiency can reach 64.5% when the Ca/S molar ratio is 1.5, the approach to the saturation temperature is 10.3 °C, and the flue gas residence time is 2.25 s. It is higher than that of in-duct sorbent injection under similar conditions, and the …Semidry desulfurization process with in situ supported sorbent preparation was studied. The effects of bed inventory, slurry sprayer height above the distributor, and slurry spray method on desulfurization efficiency were tested. ... Hydrogen Chloride Removal from Flue Gas by Low-Temperature Reaction with Calcium Hydroxide. Energy & Fuels 2018 ...
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Semidry flue gas desulfurization with a rapidly hydrated sorbent was studied in a pilot-scale circulating fluidized bed (CFB) experimental facility. The desulfurization efficiency was measured for various operating parameters, including the sorbent recirculation rate and the water spray method. The experimental results show that the desulfurization efficiencies of the …Semidry flue gas desulfurization (FGD) experiments were conducted using rapidly hydrated sorbents with four different adhesive carrier particles: circulation ash from a circulating fluidized bed boiler (CFBB circulation ash), fly ash from the first electrical field of the electrostatic precipitator of a circulating fluidized bed boiler (CFBB ESP ash), fly ash from a …
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The advantages and disadvantages of the typical semidry flue gas desulfurization (FGD) processes are analyzed, and a novel semidry FGD process with multifluid alkaline spray generator is first proposed to improve the colliding contact efficiency between sorbent particles and spray water droplets, and to form a large amount of aqueous lime ...The solution temperature was 70 C, and the solid/liquid ratio was 3/60. The CaSO 3and CaSO 4contents in the oxidation products and the oxidation rate of CaSO 3after 10 h of reaction are summarized in Fig. 2. It can be seen that the CaSO
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In this study, direct mineral carbonation of semi-dry desulfurization slag (SDe-S) through an aqueous route was investigated with an online carbonation setup to measure the amount of CO2 consumed by Ca(OH)2 at atmospheric pressure in a slurry reactor.The semidry and semiwet flue gas desulfurization is a kind of semidry desulfurization technology. ... This paper presents the relationship between desulfurization efficiency and the parameters of temperature, absolute humidity, fly ash, SO2 contentration, reacting time, etc. The study of reaction between the sorbents and SO2 has been ...
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A powder-particle spouted bed (PPSB) is proposed for removal of SO2 from flue gas. Experimental results of a bench scale process show that, in addition to the known advantages in a semidry desulfurization process, a PPSB enables more efficient SO2 removal. However, quantitative investigation of the relationship between SO2 removal efficiency and the influential …Keywords Semi-dry desulfurization ash Ammonium citrate Calcium sulfite Calcium sulfate Wet oxidation Sintering flue gas Low-temperature oxidation 1 Introduction Iron ore sintering is an important part of a long steelmaking process with sulfur dioxide emissions accounting for 40%– 80% of the total sulfur dioxide emissions in steel compa-nies ...
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Semi-dry flue gas desulfurization technology is a flue gas desulfurization technology for boilers with a capacity of 35T/H ~ 670T/H, and the desulfurization efficiency can reach more than 85%.. Spray drying is a relatively new FGD technology. Compared with the wet process, its initial investment is low, but the amount of desulfurizer is large, so it is often used in medium and low …The invention relates to a semi dry process desulfurization method of a circulating fluidized bed based on circulation. The method mainly comprises the following steps that: 1) the flue gas is subjected to humidifying and temperature adjusting through humidifiers, and then is divided into two parts to enter a lift pipe desulfurization tower, wherein one part of the processed flue gas …
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The optimal temperature of flue gas treated with this technique was shown to be approximately 420 K. In comparison with wet desulfurization scrubbers, this PPSB semi-dry process appears to have lower cost, less complicated configuration and simpler disposal of used sorbent.Keywords: Semidry desulfurization byproducts Utilization Sulphoaluminate High temperature stability Sulfur migration CLC: X773 Type: Master's thesis Year: 2009 Downloads: 186 Quote: 2 Read: Download Dissertation. Abstract. Related Dissertations.
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Semi-dry method. FSI + Q METHOD (SEMI-DRY). Within this method, flue gas desulfurization process is carried out in two stages. Stage I - desulfurization process is similar to this, observed in dry method, i.e. pulverized sorbent is injected into the area with temperatures which are optimal for calcination and bonding of S02 in furnace chamber.. Stage II - flue gas …The semi-dry desulfurization process using a powder-particle spouted bed (PPSB) is capable of SO 2 removal in excess of 95%, even at a sorbent [Ca ... Kinetic model for desulfurization at low temperatures using calcium hydroxide. Chem. Eng. Sci., 45 (1990), pp. 3427-3433. Article Download PDF View Record in Scopus Google Scholar. James, 1996.
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