Treatment process of high-ammonia and low-sulfur gas

Abstract

The invention relates to the technical field of sulfur recovery and in particular relate to a treatment process of high-ammonia and low-sulfur gas, and the method is used for solving the technical problem of unsmooth Claus reaction resulting from low enthalpy value of the high-ammonia and low-sulfur gas. The treatment process comprises the following steps: (1) introducing fuel gas, acid gas, oxygen and air into the front part of a combustion furnace for combustion so as to generate high-temperature process gas; and (2) introducing acid gas containing no ammonia from the middle part of the combustion furnace so as to react with the high-temperature process gas generated in the step (1). By adopting the treatment process, the treatment amount of the whole device can be changed flexibly so that the device can stably run within a great load range, thus being of great social significance for reduction of environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, and in particular relates to a treatment process for high-ammonia and low-sulfur gas. technical background [0002] The hydrogen sulfide gas containing ammonia with a hydrogen sulfide concentration ranging from about 5% to 20% cannot meet the conditions of the Claus reaction, so the reaction temperature must be reached and exceeded by increasing the heat of reaction or reducing the amount of combustion substances. The temperature at which the ammonia is decomposed can successfully decompose the ammonia in the hydrogen sulfide concentrated gas and process the hydrogen sulfide component in it, so as to realize the comprehensive treatment of hydrogen sulfide gas. [0003] The energy industry will produce waste gas containing nitrogen and sulfur, in which the nitrogen element mainly exists in the form of ammonia, and the sulfur element exists in the form of hydrogen sulfide. The concentratio...

AI Technical Summary

Problems solved by technology

The concentration of hydrogen sulfide in the feed gas of refining and chemical enterprises is generally above 50%, and the amount of acidic gas is much smaller than that of clean acid gas (that is, hydrogen sulfide gas without ammonia); for some small coal chemical enterprises , although the concentration of hydrogen sulfide in the feed gas is low, it does not contain ammonia, and these two cases are relatively easy to deal with

The treatment of high ammonia and low sulfuric acid gas is relatively difficult, because the decomposition of ammonia requires a high temperature above 1250 ° C, and the heat contributed by the combustion of hydrogen sulfide concentrated gas itself is far from meeting the temperature requirements for the decomposition of ammonia

The reaction temperature in the sulfur furnace is related to the purity of hydrogen sulfide. The higher the purity of hydrogen sulfide, the higher the reaction temperature. To deal with this situation, the conventional treatment method is to use oxygen-enriched technology, that is, to reduce the amount of process gas to improve the overall combustion efficiency. The temperature of the furnace, but once the oxygen content in the air exceeds 29% when the oxygen-enriched technology is applied, a large-scale transformation of the combustion furnace is required, and even a cold flow cycle technology is required. Not only is the technology cumbersome, the control is difficult, and exposure occurs Disadvantages of small device flexibility

The device designed in this way can only operate within a relatively narrow range of acid gas composition, which has a great impact on the operation of the device

[0004] The main reason for the difficulty in the treatment of high ammonia and low sulfuric acid gas is that its own low enthalpy is not enough to support the smooth progress of the Claus reaction