Research

Process for automated regulation of sulfur production units - US Patent 3933992 more>>

This invention concerns an improved process and device for automated regulation of units producing sulphur by oxidation of hydrogen sulphide.

Abstract

A process for automated regulation of a unit producing sulphur by oxidation of hydrogen sulphide, in which the flow of gas carrying oxygen into the unit is regulated so as to keep an operating parameter, based on measurement of the sulphurous compound of the residual gases, level with a reference value. It is characterized by the fact that the control signal, used to regulate the flow of gas containing oxygen at the unit inlet, is a combination of a signal based on measurements taken at the inlet, and representing the theoretical flow of this gas needed to keep the operating parameter at its reference level and another signal representing the correction needed in this flow to adjust the instantaneous value of the parameter to the reference level. This process allow better control of the sulphur unit, with increased efficiency and reduced atmospheric pollution.

System for temperature control of a Claus sulfur unit thermal reactor - US Patent 4438069 more>>

Abstract
A system is disclosed for controlling the environment and temperature in the initial thermal reaction zone of an at least two-zone Claus thermal unit by means of control signals. Both a feed-back control and a feed-forward control are disclosed.

Sulfur Recovery from Acid Gas Using the Claus Process and High Temperature Air Combustion (HiTAC) Technology - American Journal of Environmental Sciences.   more>>

Abstract
Sulfur-bearing compounds are very detrimental to the environment and to industrial process equipment. They are often obtained or formed as a by-product of separation and thermal processing of fuels containing sulfur, such as coal, crude oil and natural gas. The two sulfur compounds, which need special attention, are: hydrogen sulfide (H2S) and sulfur dioxide (SO2). H2S is a highly corrosive gas with a foul smell. SO2 is a toxic gas responsible for acid rain formation and equipment corrosion. Various methods of reducing pollutants containing sulfur are described in this paper, with a focus on the modified Claus process, enhanced by the use of High Temperature Air Combustion (HiTAC) technology in the Claus furnace... http://www.scipub.org/fulltext/ajes/ajes45502-511.pdf

Description of Sulfur

Occurs in large deposits as yellow crystals. It is stable in air and water but will burn if ignited, giving off the acrid gas, sulfur dioxide, its most famous compound, which is used to make sulfuric acid, the single most important industrial chemical. Sulfur dioxide is also produced when coal and oil are burned, and contributes towards so called ‘acid rain’. Sulfur is essential to all living things and there is a sulfur cycle in nature. The average human contains 140 grams and takes in about 1 gram a day.

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