Industrial boilers normally produce steam at high pressures and temperatures, since in this superheated condition it carries more energy and results in more efficient production of power in the turbine. This high pressure also allows the steam to be transported around the plant in smaller lines with less heat loss. For use in a process plant, both the pressure and the temperature have to be reduced.
A letdown station solves this problem. It comprises a pressure reducing valve and the temperature reducing apparatus. The solution is to use a valve with a special trim that is engineered to solve the complex requirement of both pressure reduction and noise control. A Mitech energy dissipating disk stack that fits into the company’s range of standard Globe valves is one of the best methods to achieve this. The pressure is dropped across many stages. The disk stack combines the concept of many restrictions in series (along each passageway) with multiple paths in parallel (several passageways in each disk and many disks in a stack). This enables the valve to handle low flow rates as well as the maximum flows. One or more diffuser plates may be installed downstream of the valve to create back-pressure to enable a smaller valve to be used.
But, reducing the pressure of the superheated steam does very little to reduce the temperature. To reduce the temperature of the steam, a de-superheater is utilised to add water. To vaporise the water a large amount of energy is required to overcome the latent heat vaporisation. The high temperature steam provides this. The result is an increased flow of steam at a reduced temperature. By varying the amount of water added, the temperature can be controlled.
Submersible pump protection ifm - South Africa
Valves, Actuators & Pump Control
With ifm’s remote monitoring solution you can visualise the condition of your submersible pumps and diagnose issues before they become serious problems.
Read more...Electrically operated, energy-efficient double diaphragm pumps
Valves, Actuators & Pump Control
BMG has introduced the EVO 210 series electric double diaphragm pump range, offering a quieter, more energy-efficient alternative to conventional air-operated diaphragm pumps for chemical processing, mining, wastewater treatment and general manufacturing applications.
Read more...Internationally engineered valves support uptime in tough conditions Bearing Man Group t/a BMG
Valves, Actuators & Pump Control
BMG’s Fluid Technology division works closely with industry in sub-Saharan Africa to ensure that all valves, strainers and flow control equipment supplied meet the exact requirements of every application and also conform with stringent industry standards.
Read more...Hygienic processing with butterfly valves and Bürkert control technology Bürkert South Africa
Valves, Actuators & Pump Control
Among the standout technologies shaping modern hygienic processing environments are hygienic butterfly valves, especially when seamlessly integrated with Bürkert actuators, control tops and positioners.
Read more...Cryogenic valve limits leakage and energy loss
Valves, Actuators & Pump Control
Emerson has introduced the Fisher IC2 cryogenic top-entry control valve, ideal for cold box applications in air separation units, hydrogen liquefaction and LNG production.
Read more...Allmech introduces new water treatment solutions
Valves, Actuators & Pump Control
Allmech has announced a series of product updates aimed at improving reliability, efficiency and system simplicity in high-volume and high-hardness water environments.
Read more...Duplex valve improves continuous production at Gauteng manufacturing facility
Valves, Actuators & Pump Control
In a recent installation at a Gauteng-based manufacturer of household and personal care products, Allmech provided a tailored water treatment solution to ensure a consistent supply of soft water for steam generation, an essential element in the client’s 24/7 production cycle.
Read more...Developing solutions for SA’s wastewater challenges
Valves, Actuators & Pump Control
KSB Pumps has a proud global legacy in the development of self-priming pump technology, which reflects decades of engineering innovation and application expertise. Building on this foundation, KSB’s AU series has extended the company’s self-priming expertise into screened wastewater handling, which meets the growing needs of municipal and industrial sectors worldwide.
Read more...Helping to solve wastewater challenges
Valves, Actuators & Pump Control
KSB Pumps and Valves is doubling its efforts to help government and municipalities find practical and technical solutions to the growing wastewater challenges gripping large parts of the country.
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