Remediation of loading and unloading mechanical equipmentsfor reduction of particulate air pollution : (Persian Gulf mining and metal industries special economic zone, 2011)
After initial review of existing design and operation documents and maintenance records for stacker and reclaimer equipments and reviewing standards' requirements and failure analysis, the main problems were assessed to be due to improper assembly and welding of gearbox foundations, , improper adjustments of gears, and untight bolts ongearboxes and slewing to the proper torque.
Assessment of workers exposure hazards to electromagnetic fields : (Persian Gulf mining and metal industries Special Economic Zone, 2011)
Power transmission lines and substations of various voltages were assessed for ELF radiation. Magnetic flux densities were statistically analyzed and potential exposures were assessed and necessary relocation and/or reduced stay in the vicinity of personnel were recommended.
Source apportionment of pollutants from various industries inside and around special economic zone : (Persian Gulf mining and metal industries SEZ, 2011)
An assessment of the pollution generation by various industries withing and around the SEZ is done based on process evaluation, emission factors, and prevailing meteorological conditions. This data is supplemented by field monitoring of specific air pollutants during different seasons. Based on chemical composition of the collected samples (particulate and gaseous) at the receptors and source evaluations, necessary calculations are made including the use of Blind Source Separation algorithms commonly employed in electrical engineering for unmixing of signals. The results will be used to make necessary esimations regarding the future environmental conditions emanating from the development plans.
Air pollution modeling in Mobarakeh Steel Complex : (Isfahan Mobarakeh Steel Company, 2008)
Various process and collection devices' data were collected for spatio-temporal analysis of the environment status with emphasis on particulate air pollution. Necessary field measurements were conducted to remedy insufficient/poor data quality based on statistical evaluations. After model suitability evaluations, ADMS was selected for dispersion modeling in the second phase.Input data included source characteristics, topography, location and height of buildings, and meteorological characteristics. The results were provided to the management to make necessary decisions for process rehabilitation, installation of new control equipments, and maintenance improvements.
Nonpoint source estimation of particulate air pollution due to loading and unloading of raw materials : (Persian Gulf mining and metal industries SEZ, 2008)
The exsiting environemtnal conditions were evaluated through site visits, sampling, and design documents and operational reviews. Various national and international practices in similar mineral industries were reviewed to assess the feasibility of implementation considering technology availability, cost, and operational skills requirements.
Comprehensive air pollution improvement master plan for existing and future expansion : (Khuzestan Steel Company, 2008)
Various projects were undertaken in the development of the plan including the following:
1- Reduction of particulate generation due to iron pile wind erosion
experimental and theoretical simulations were done through wind tunnel and CFD (Fluent, Gambit) studies. Solutions used in other steel companies, usage of different stabilizers, and improvement of pile coverage were investigated.
2-Dust pollution Control from flow gate intersection and mill area and modification of bag filters
Above the iron, limestone and bentonite reservoirs of the complex, there are four bagfilters with sliding system. Despite being relatively efficient, their upgrading capacity should be investigated. The existing cyclone at flow gate intersection is not operational.
3-Dust control from screen 6 and storage operations of lime and dolomite
Limestone which is stored in the piles is transmitted to the feeder by loader to be separated. There is no contorlsystem on the the path. Installation of telescopic chute equipped with altimeter was recommended.
4-Dust control from bucket wheel and stacker in loading and unloading unit
In order to control the dust generated while bucket wheel is working, spray system consisting of polyethylene pipes and steel nozzles should be used.
5-Dust control from screens 1-8A and 1-8B in lime making unit
Limestone and dolomite are sent by belt feeder from feeders to the screens. Recommendations included sealed screen cover, enclosure of limestone drop, was and installation of new bagfilters.
6-Control of pollution from waste lime loading
When the waste lime is discharging to trucks, because of the lack of suitable controlling system, a great amount of pollution is generated. A suction channel which is attached to the bagfilter does not have the capacity to control the pollution.
7-H2.016 Scrubbers Modification and reconstruction
In preliminarily design, these scrubbers are used for collecting dust from conveying belt which is transferring material from pellet storage to screen. These mentioned scrubbers are out of work. This survey includes suction points, ducts and hoods, Fans, water injection amount and location, sludge amount, sludge volume of storage tank, junctions, etc.
8-Feasibility study of scrubbers for dust control from H1.010 and G5.020 stacks
Emitted gas from ovens is passing through a multicyclone before entering the stacks. This system is not efficient enough to control the pollution, and in the event of discharging furnace gases to the atmosphere, pellet dust and other pollutants which irritate unit personnel are discharged. Improvement of stack H1.010 scrubber, improvement of dust collection system (ducts, fans, and suction points), usage of new deduster for stacks are the goals of this project to control the pollution.
Process evaluation, monitoring, and air dispersion : (Khouzestan Steel Company, 2007)
Existing environmental monitoring data were collected and site visits were made for determination of pollution generation potential in various units. The emission inventory, unit characteristics, , location and other relevant data were compiled in a data bank. The data collected and the results of modeling were used for the design of monitoring network within and around the complex. ADMS 4 was used for modeling the impact of air pollutant transport to the neighboring communities.
Survey and measurement of atmospheric pollutants in Mobarakeh Steel Complex : (Isfahan Mobarakeh Steel Company, 2006)
During the first phase of field visits, information forms and documents of environment unit were gathered. Then data samples were processed by statistical methods and data deficiencies were evaluated. Since the site topography has an effective role on air pollutants emission, the site map and 75 km of its surrounding area were prepared in raster layers in GIS environment. To calculate the amount of pollutants released from the sources, four approaches were used: emission factors, feul consumption, , control devices' output, and historical monitoring data. Relative contribution of each source and prevailing meteorogical conditions were used in the dispersion modeling to determine deviations from standards in various residential towns downstream as well as degree of control required.