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Objective The aim is to develop the treatment technology for the amine solution purification (APU) unit wastewater from the Cansolv exhaust gas treatment device, which is characterized with high concentration of salinity, organic matter and reducing sulfur and would affect the stable operation of the water treatment system. Methods The water quality characteristics of Venturi and APU wastewater from two natural gas purification plants were analyzed in detail. The complex compositions of APU wastewater were the key factors to affect the stable operation of the water treatment system. Various advanced oxidation technologies including ozone (O3), O3 coupled catalyst, and the mixture of ozone/hydrogen peroxide (O3/H2O2), were used to treat APU wastewater. The degradation effect of organic matter was evaluated by the changes in chemical oxygen demand (COD) content and total organic carbon (TOC) content in the wastewater. The causes of reverse osmosis membrane fouling blockage and the O3/H2O2 degradation mechanism of organic matter were studied. Results O3/H2O2 was the optimum method to remove organic matter from wastewater when the O3 concentration was 22 500 mg/L in 200 mL wastewater, H2O2 dosage was 2 mL and reaction time was 60 min, the best treatment effection was achieved, and the COD removal rate was 60.8%. Conclusions The O3/H2O2 oxidation can completely remove the reducing sulfur and effectively reduce the organic matter content in APU wastewater, furthermore solve fouling and blocking problems of the membrane concentrator and evaporation crystallization unit. [ABSTRACT FROM AUTHOR]

Objective The advantages and disadvantages of reduction absorption and oxidation absorption tail gas treatment processes in the application process of natural gas purification plants were clarified. Methods The adaptability of the two exhaust gas treatment processes was clarified by comparing the process principle and flow, key operation control and main process parameters, the impact on sulfur recovery and sewage treatment devices, energy consumption and material consumption. Results Through comparative analysis, it can be concluded that the process flow of Cansolv tail gas treatment is more concise, and the desulfurization solvent has obvious absorption performance advantages, which also has adverse effects such as DS desulfurization solvent purification, equipment corrosion protection, and S02-containing sewage treatment. Conclusions Based on the advantages of high efficiency of desulfurization solution, the Cansolv process has lower comprehensive energy consumption, material cost, land occupation and investment than the Scott process, and has better applicability. [ABSTRACT FROM AUTHOR]

With implementation of GB 17820-2018 Natural Gas. the purification plants under the Natural Gas Purification Plant General of Southwest Oil and Gasfield Company are faced with the requirement of class I gus index value for product natural gas. To achieve the requirement of new. standard GB 17820-2018. the existing configuration of on-line monitoring equipment are analyzed by compared with the new standard. According to the correlation degree between the five quality index values(the calorific value, total sulfur content, hydrogen sulfide content. carbon dioxide content and water dew point) and the gas purification plant. the configuration suggestions and application. management improvement measures of on-line analyzer are put forward in order to achieve the purpose. of reasonable configuration and use of on-line analyzer for product quality index monitoring. The research results show that: (1) among the five quality indexes of natural gas high calorific value. total sulfur content. hydrogen sulfide content. carbon dioxide content and water dew point. in which high calorific value and carbon dioxide content are easy to meet the index value. but water dew point, total sulfur content and hydrogen sulfide content are the key and difficult points in the operation and control of natural gas purification plant, which is easy to exceed the index value in the production: (2) the water on-line analyzer currently configured in each natural gas purification plant can meet the requirements of water dew point monitoring in GB 17820-2018 and continue to be used: (3) the hydrogen sulfide on line analyzer currently configured can not meet the requirements of hydrogen sullide content monitoring in GB 17820-2018 and needs to be reselected and replaced, (4) the quantity of total sulfur on line analyzer needs to be added: (5) the configuration of carbon dioxide on line analyzer remains the status quoi (6) the calorific value on-line analyzer is not available for the time being consider. [ABSTRACT FROM AUTHOR]