Complete set of thermodynamic calculation method suitable for Claus oven

Abstract

The invention discloses a complete set of thermodynamic calculation method suitable for a Claus oven. The method comprises the steps: firstly, thermophysical properties of a fuel are calculated by polynomial fitting, and the function relationship between the temperature of multi-component gas and the thermophysical properties is obtained; then, the acid gas consumption amount B is calculated by anoverall thermal equilibrium model; next, heat exchange structures are analyzed, and a simplified calculation model of the heat exchange surface structures is established for calculating the area H ofthe heat exchange surface; then the total heat exchange coefficient K is calculated through the convection current heat exchange coefficient and the radiation heat exchange coefficient of a flue gasside; the heat exchange quantity Qc=KH[delta]t / B of each heat exchange surface is calculated; and finally, the total thermal equilibrium calibration model is established, wherein the total heat absorption quantity Q=Qs+Q1+Q2+Q3-Q4+Q5-Q6+Q7, Qs is the combustion hearth heat dispersion quantity, Q1 and Q2 are first-section and second-section heat exchange quantities of a waste heat boiler, Q3, Q5 and Q7 are heat exchange quantities of first-level, second-level and last-level sulfur condensers, and Q4 and Q6 are heat exchange quantities of first-level and second-level hydrogenation feed reactors;and the equilibrium error is 100(Qr[eta] / 100-Q) / Qr, wherein Qr is the combustion heat quantity of the fuel in the hearth, and [eta] is the boiler efficiency.

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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