A Complete Calculation Method of Thermodynamics Applicable to Claus Furnace

Abstract

The invention discloses a whole set of thermodynamic calculation method suitable for Claus furnace. The method first uses "polynomial fitting" to calculate the thermophysical properties of fuel, and obtains the functional relationship between multi-component gas temperature and thermophysical properties; and then Calculate the acid gas consumption B through the overall heat balance model; then analyze each heat transfer structure, establish a simplified calculation model of the heat transfer surface structure to calculate the area H of the heat transfer surface; then use the convective heat transfer coefficient and radiation on the flue gas side The heat transfer coefficient calculates the overall heat transfer coefficient K; this is followed by calculating the heat transfer Q of each heat transfer surface c =KHΔt / B; Finally, the total heat balance verification model is established, and the total heat absorption Q=Q s +Q 1 +Q 2 +Q 3 -Q 4 +Q 5 -Q 6 +Q 7 , where Q s is the heat dissipation in the combustion furnace, Q 1 , Q 2 is the heat exchange heat of the first and second stages of the waste heat boiler, Q 3 , Q 5 , Q 7 is the first-stage, second-stage, and final-stage sulfur condenser heat transfer, Q 4 , Q 6 is the heat exchange rate of the first-stage and second-stage hydrogenation feed reactors; the balance error is 100(Q r η / 100‑Q) / Q r , where Q r is the heat of combustion of the fuel in the furnace, and η is the efficiency of the boiler.

Description

technical field [0001] The invention belongs to the field of chemical heat calculation, and in particular relates to a heat calculation method suitable for a Claus furnace. Background technique [0002] The Claus furnace adopts the Claus method for sulfur recovery. The sulfur recovery process consists of the acid gas from the deacidification and steaming amine process. After pressure adjustment, the hydrogen sulfide is extracted from the series of devices in the process, and the ammonia and cyanide are simultaneously extracted. Hydrogen catalytic decomposition. Hydrogen sulfide is first converted in the Claus furnace, about 1 / 3 of hydrogen sulfide and air are burned to form sulfur dioxide, and then the generated sulfur dioxide reacts with hydrogen sulfide, and about 2 / 3 of hydrogen sulfide reacts to form sulfur. Then, the combusted gas is cooled by heat exchange equipment at all levels, and the sulfur in the recovered gas is condensed and recovered in the liquid sulfur pool...

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Problems solved by technology

[0004] In previous studies, there was no set of thermodynamic calculation methods especially suitable for Claus furnaces, and there were no corresponding heat balance, heat convection, and heat radiation models, which made it difficult to design Claus burners and their operating parameters. Predetermining suitable dimensions and thermal parameters makes it difficult to obtain an optimal design solution

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