Inner cooling type direct oxidation recycling method and recycling device of sulfur

Abstract

The invention relates to an inner cooling type direct oxidation recycling method and a recycling device of oxidation sulfur. Acid gas and air conduct burning and the Klaus reaction in a main burning furnace, the air flow coming out directly enters a waste heat boiler, most sulfur steam is condensed and enters a first-level Klaus reactor after being heated, H2S and SO2 in procedure gas generate sulfur, the procedure gas enters a first-level condenser to enable most sulfur steam to be condensed to into liquid sulfur to be separated, the procedure gas is heated and enters a second-level Klaus reactor, the liquid sulfur is condensed and separated through the condenser, Klaus tail gas and air are mixed in a static mixer to be heated and then enter an inner cooling type direct oxidation reactor, hydrogen sulfide in the tail gas is oxidized into the sulfur under the effect of a catalyst, heat produced by direct oxidation of the hydrogen sulfide is carried away by the inner cooling structure, and the procedure gas enters a liquid sulfur catcher and a tail gas combustion furnace and is discharged through a chimney after the liquid sulfur is separated from the procedure gas. By means of the method, sulfur recycling rate can be stabilized to be more than 85%.

Description

technical field [0001] The invention relates to an internal cooling type direct oxidation sulfur recovery method and device, which is suitable for processing medium-high sulfuric acid gas and belongs to the field of natural gas and refinery gas processing. Background technique [0002] At present, the technologies for recovering sulfur from hydrogen sulfide-containing acid gas mainly include conventional Claus method, conventional Claus + reduction and absorption tail gas treatment method and Claus extended method. Their basic methods and disadvantages are introduced as follows: [0003] 1. Conventional Claus method [0004] The conventional Claus method was introduced in 1883 and industrialized in 1938. The method involves the main [0005] There are two kinds of chemical reactions, [0006] One is the chemical reaction in the main combustion furnace, including: [0007] h 2 S+3O 2 →2H 2 O+2SO 2 ;2H 2 S+SO 2 →2H 2 O+3S x / x;CH 4 +SO 2 →COS+H 2 O+H 2 ;CO+S→COS...

AI Technical Summary

Problems solved by technology

Although high temperature is beneficial to the hydrolysis reaction, it is not conducive to the Claus reaction, which limits the sulfur conversion rate;

[0015] (4) The sulfur conversion rate has strict requirements on the air distribution ratio, and H must be maintained 2 S: SO 2 = 2:1 optimal ratio, otherwise it will lead to lower sulfur conversion

[0020] The MCRC method and the CBA method belong to the low-temperature Claus process. The main disadvantages are: the total sulfur recovery rate of the device is prone to fluctuations, and strict control of H in the tail gas is required. 2 S / SO 2 ratio, which increases the difficulty of air distribution of the device, and the catalyst is easily deactivated after the adsorption / regeneration process

[0023] There is a common disadvantage of the Super Claus method and the Super Claus method: the process uses H 2 S operates in excess, but for H 2 There are strict requirements on the upper limit of S concentration

H entering the selective oxidation reactor 2 Excessively high S concentration will cause the temperature rise of the catalyst bed to be too large, resulting in the deactivation of the catalyst due to overheating, and the H 2 The selectivity of S conversion to sulfur is reduced, which makes the conversion reaction of sulfur incomplete, thereby affecting the total sulfur recovery rate

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