Desulfurization Of Coke Oven Gas Research Articles

Desulfurization of coke-oven gas

Desulfurization of coke-oven gas

Desulfurization of coke oven gas from the coking of coking coal blended with a sorbent and waste plastic

A new way to implement the simultaneous reutilization of solid waste, the desulfurization of coke oven gas (COG), and even the desulfurization of coke by the co-coking of coking coal (CC) and waste plastic (WP) blended with a sorbent is proposed; the evolution of H2S and the removal efficiency of H2S from COG during the co-coking process were investigated in a lab-scale cylindrical reactor. The experimental results indicated that for the coking of CC blended with ZnO, Fe2O3, or blast furnace dust (BFD) as a sorbent, the instantaneous concentration of H2S in COG was lower than 500 mg/m(3) (which meets the technical specification requirement of the Chinese Cleaner Production Standard-Coking Industry, HJ/T 126-2003) when the molar ratio between the key component of the sorbent and the volatile S in CC or the CC/WP blend, n(Zn+Fe)/nS, was about 1.2 for ZnO and Fe2O3, but not for BFD under the same conditions, suggesting that ZnO and Fe2O3 are promising sorbents, but that BFD must be treated chemical or thermally before being used as a sorbent because of the size and complicated nature of the influence of its phase/chemical composition on its desulfurization ability. However, for the co-coking of CC and WP blended with ZnO as a sorbent, n(Zn+ Fe)/nS must increase to 1.4 and 1.7 for 100/2 and 100/5 blends of CC/WP, respectively, to ensure a satisfactory efficiency for H2S removal from COG.

04/01258 Improvement of coke-oven gas desulfurization process: Egorov, V. N. et al. Koks i Khimiya, 2003, (1), 26–29. (In Russian)

04/01258 Improvement of coke-oven gas desulfurization process: Egorov, V. N. et al. Koks i Khimiya, 2003, (1), 26–29. (In Russian)

Desulfurization of coke oven gas by mixing ZnO powder into coal : Tang, H. et al. Ranliao Huaxue Xuebao, 2002, 30, (3), 209–213. (In Chinese)

On the basis of thermodynamic simulation, behavior of H 2S removal from coke oven gas by mixing znic oxide into the coal and the effect of the additive on the coke quality have been investigated The experimental results show that in the stage when coal converts into semicoke, hydrogen sulfide concentration in COG decreases with the increase of zinc additive in coal And an optimum amount is about 40% excess of the stoichiometric amount of zinc additive needed in coal In the stage when semicoke converts into coke, hydrogen sulfide concentration in COG decreases with the increase of zinc additive in coal, the reason of which is the zinc oxide retented in the semicoke is more easier to decompose under the same condition than zinc sulfide The addtive of zinc oxide in coal has little deleterious effect on coke quality

Modelling chemical absorption for a coke-oven-gas H2S scrubber

Due to the need to meet stringent environmental regulations and to minimize capital and operating costs, the design and operation of coke-oven gas (COG) desulfurization processes must be optimized. For H2S Scrubbers, this paper presents a rigorous rate model that accounts for not only mass and heat transfer mechanisms, but also complex and reversible chemical reactions involving H2S, CO2, NH3 and associated ions. The model need not use a chemical enhancement factor based on simplified reaction mechanisms. This model can be extended to simulation of NH3 scrubbers, deacifiers and NH3 stills of COG desulfurization processes. The model establishes liquid-film concentration profiles of individual components and temperature profile. For a typical industrial H2S scrubber, the predicted absorption efficiency for H2S, CO2, and NH3 is 86.4% and 60.2%, respectively.

99/02025 Study on desulfurization of coke oven gas by diluted ammonia water. 1: Kuroki, M. Nippon Enerugi Gakkaishi, 1998, 77, (9), 896–905. (In Japanese)

99/02025 Study on desulfurization of coke oven gas by diluted ammonia water. 1: Kuroki, M. Nippon Enerugi Gakkaishi, 1998, 77, (9), 896–905. (In Japanese)

希薄アンモニア水による石炭ガス脱硫法の研究 （ＩＩ） アンモニア水溶液によるＣＯＧ酸性ガス吸収基礎試験

Reactions of sour gas components, such as H2S, HCN and CO2 in COG, with diluted aqueous ammonia solution were studied through adsorption tests by means of packed tower.In case of purifying COG containing a proper quantity of NH3, water washing method with a suitable L/G was found to be most effective for selectively removing H2S and HCN from COG.Rates of absorbing reactions of sour gas components with aqueous ammonia solution are determined by gas film resistance, and then main factors for chemical engineering are obtainable by theoretical calculation based on inlet/ outlet gas properties.In this paper, theoretical height of packed tower, compared with obserbed one, is discussed by means of calculating over-all gas-phase volumetric coefficient KGa based on Henry's law constant with chemical reaction derived from the previous work.

希薄アンモニア水による石炭ガス脱硫法の研究 （ＩＩＩ） パイロットプラントによるＣＯＧ酸性ガス吸収試験

希薄アンモニア水による石炭ガス脱硫法の研究 （ＩＩＩ） パイロットプラントによるＣＯＧ酸性ガス吸収試験

希薄アンモニア水による石炭ガス脱硫法の研究 Ｉ アンモニア水に対するＨＣＮ，Ｈ２ＳおよびＣＯ２の溶解平衡

Reactions of sour gas components, such as H2S, HCN and CO2 in COG, with diluted aqueous ammonia solution were studied through adsorption tests by means of packed tower.In case of purifying COG containing a proper quantity of NH3, water washing method with a suitable L/G was found to be most effective for selectively removing H2S and HCN from COG.Rates of absorbing reactions of sour gas components with aqueous ammonia solution are determined by gas film resistance, and then main factors for chemical engineering are obtainable by theoretical calculation based on inlet/ outlet gas properties.In this paper, theoretical height of packed tower, compared with obserbed one, is discussed by means of calculating over-all gas-phase volumetric coefficient KGa based on Henry's law constant with chemical reaction derived from the previous work.

96/03281 - New process for coke oven gas desulfurization

96/03281 - New process for coke oven gas desulfurization

Manufacture of gypsum from combustion waste gas in desulfurization of coke oven gas

Manufacture of gypsum from combustion waste gas in desulfurization of coke oven gas

Economics and Alternatives for Sulfur Removal from Coke Oven Gas

Two processes are currently being employed in North America for the desulfurization of coke oven gas, the Vacuum Carbonate System, and the Stretford System. A third, the Sulfi-ban Process, which was recently announced, now has several plants scheduled for construction. Overall operating requirements for each of these processes are considered in detail. Emphasis is placed on an identification of power and steam requirements, the types and amounts of solid and/or liquid waste streams produced together with methods for their treatment, and the net desulfurization efficiencies achieved by each process. Detailed estimates of capital and operating costs for desulfurization are considered, and equipment needs for environmental control requirements are discussed.