May 2006Analytical Instrumentation & Environmental Monitoring
In general, industrial scrubbers are designed to remove potentially harmful and polluting gas emissions from various types of industrial processing plants. These gases can typically be sulphur dioxide, chlorine, hydrogen chloride and hydrogen sulphide to name but a few.
Scrubbers operate by passing the toxic gas through a chemical solution that either dissolves or destroys the harmful gas by a chemical reaction. The spent scrubbing solution can sometimes be regenerated, disposed of in an environmentally friendly way or simply sold as a by-product. By-products can typically be sodium hypochlorite from chlorine scrubbing with caustic or gypsum from sulphur dioxide scrubbing with lime. There are a number of types of scrubber designs depending on the type of toxins and resulting neutralised residues. These can typically be:
* Orifice scrubbing.
* Venturi scrubbing.
* Fibre-bed scrubbing.
* Mechanical scrubbing.
* Impingement plate scrubbing
* Spray scrubbing.
* Condensation scrubbing.
Their individual designs and principal of operation is to be able to disperse as much toxic gas into the scrubbing solution, thereby maximising the chemical reaction.
To ensure the effectiveness and efficiency of the scrubber, the concentration of the scrubbing chemical must be maintained, pH, ORP and/or conductivity measurements are therefore used to monitor and maintain the strength of the scrubbing solution by blowing down and replenishing the solution.
There are two basic methods for wet scrubbing, 'batch scrubbers' and 'continuous replenishment scrubbers'. Batch scrubbers use a high concentration of scrubbing chemical and only flush or blow-down once the chemical has been spent, while continuous replenishment scrubbers blow-down and replenish the scrubbing chemical to maintain a consistent lower level of concentration. In order to effectively and efficiently control the process, various analog and digital points have to be closely monitored, controlled and alarmed, these would typically be levels, flow, pH/conductivity and/or ORP, pumps, fans, valves and switches, along with their run, trip, and/or position status.
With new legislations being passed worldwide and hefty fines being imposed on industries exceeding permitted gas emissions levels. Scrubbers are playing a key yet vital roll by protecting the atmosphere and environment.
Thuthuka Group, a leading process engineering and project management company, provide turnkey solutions for most wet scrubber types. This company has partnered with a number of subcontractors that are leaders in their field of expertise to provide the total solution. Opto Controls is a supplier and integrator of the Opto 22 range of industrial Ethernet-based SNAP-PAC programmable automation controllers (PAC) and the fully integrated ioProject software suite. These products combine with the Opto 22 line of SNAP I/O modules to provide a complete system for achieving the necessary analog, digital and serial control needed for the monitoring, logging, control and alarming of the numerous field devices and operator interface terminals and much more. The Opto 22 hardware can also provide GSM support for remote alarming via SMS. The diagram illustrates a typical control overview of a scrubber.
Elevating mining separation processes through precision instrumentation Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
In mining operations, the quest for efficiency and productivity is key. There is an urgent need for innovative solutions to enhance the performance of extraction processes while balancing operational costs and environmental impact.
Read more...Alfa Laval launches next generation
Analytical Instrumentation & Environmental Monitoring
Alfa Laval has launched Clariot, a next generation, AI-based condition monitoring solution, precision-built for hygienic process equipment to deliver more accurate analysis and support.
Read more...The next generation in metal sorting Mecosa
Analytical Instrumentation & Environmental Monitoring
In the metal recycling industry, companies are increasingly challenged to not only improve the efficiency of their processes but also to raise the quality and purity of the sorted materials to new levels. By integrating proven spectral analysis technology into its market-leading REDWAVE XRF sorting system, REDWAVE is unlocking new opportunities for metal recycling, particularly in aluminium recovery.
Read more...Ensuring clean and safe water Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
Endress+Hauser’s comprehensive range of disinfection sensors are designed to monitor and control disinfectant levels in water treatment processes.
Read more...Anton Paar launches inline refractometers for precision Brix monitoring Anton Paar
Analytical Instrumentation & Environmental Monitoring
[Sponsored] Anton Paar has introduced innovative inline refractometers that are designed for continuous Brix concentration monitoring in metalworking machines, fruit and vegetable processing and other industrial processes.
Read more...Supporting fast, safe helicopter service across Sweden ATEQ South Africa
Analytical Instrumentation & Environmental Monitoring
In an environment with high risks and fierce competition, Storm Heliworks’ fleet of eight helicopters operates on assignments throughout Scandinavia. Maintenance is critical, and the company recently invested in a battery charger analyser from ATEQ Aviation.
Read more...WearCheck introduces advanced Legionella testing to safeguard water quality Wearcheck
Analytical Instrumentation & Environmental Monitoring
WearCheck Water has expanded its expertise in water analysis with the introduction of Legionella pneumophila detection and enumeration. This positions the company at the forefront of water and surface safety monitoring, ensuring businesses, industries, and public institutions can proactively manage legionella contamination risks.
Read more...Silo weighing made easy - new mounting kit for load cells
Analytical Instrumentation & Environmental Monitoring
The PR 6003 mounting kit features fast commissioning in demanding applications in industrial silo weighing. It combines maximum accuracy with maximum safety in a compact system.
Read more...Smart weighing boosts Bayer’s automation
Analytical Instrumentation & Environmental Monitoring
he new supply centre of the agricultural chemical and pharmaceutical company Bayer in Hangzhou integrates weighing technology of Minebea Intec for precise mixing and homogenisation in Zone 2 hazardous areas.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version