A number of commercial processes are available for removing hydrogen sulfide (H2S) from natural gas, tail gas from the Claus Process (containing un-reactive sulfur compounds, particularly CS2 and COS), coke-oven gas, pyrolysis gas and solution tail gas from heavy oil production. These processes are often limited by economics and technology. In the economic range from about 0.1 to 15 tons sulfur...

Over a Period of three months (summer), 108 samples of water collected from four hospitals in Te-hran. They were taken from numerous potable and non-potable water, including main supply cis-terns, calorifiers, hot and cold tap water, shower, cooling tower and drain of air condition system. Culturing of concentrated and non-concentrated water samples on Buffered Charcoal Yeast Extract (BCYE) Aga...

the wind pressure is one of the important loads on cooling towers which can be computed via numerical solution of the wind flow. in this paper, the effects of turbulent modeling on accurate computations of wind pressure on a cooling tower with base structure are investigated. for this propose, the results of a finite element flow solver using various commonly used turbulence models are compared...

Forced draft evaporative cooling towers are often used for condenser cooling in small steam power plants. Conventional control strategies keep the cooling pump operating at full speed all the time, and control the cooling water temperature by modulating the tower fan speed. In this work, an energy-efficient control strategy is proposed, that minimizes the combined consumption of the tower fans ...

This paper presents a mixed-integer nonlinear programming (MINLP) model for the optimal design of mechanical counter-flow cooling towers, subjected to standard design constraints. The objective function consists of the minimization of the total annual cost, which includes the capital cost of the cooling tower (that depends on the filling material and the air flowrate) and the operating cost (th...

outbreaks of legionellosis may be a side effect of institution-water treatment. however, the long-term outcomes and the predictive factors of legionella prevalence in such systems have still not been fully studied. this study was therefore conducted to investigate the prevalence of legionella spp. and to evaluate the role of bacteriological water quality parameters on its prevalence and removal...

An updraft tower cooling system is assessed for elimination of water use associated with power plant heat rejection. Heat rejected from the power plant condenser is used to warm the air at the base of an updraft tower; buoyancy-driven air flows through a recuperative turbine inside the tower. The secondary loop, which couples the power plant condenser to a heat exchanger at the tower base, can ...

â  performance and capacity of sulfur recovery unit (sru) are greatly affected by the h2s:co2 ratio of the acid gas stream. the acid gases in iran contain around 35 mol% h2s and 60 mol% co2. this low concentration of h2s calls for more complex sulfur plant, larger equipments, and higher costs. acid gas enrichment processes (age) is run to upgrade low quality acid gas collected from gas treating...

in this report, experimental investigation of waste water treatment by reverse osmosis to enable its reuse in cooling tower is presented. a polyamide spiral wound ro membrane followed by three filters as ro pretreatment (two activated carbon and one cartridge filter) and samples of tehran refinery treated waste water have been used. the effect of operating conditions such as pressure difference...