With ARCA Valves you will find the right control valve for each process step in the boiler of the power plant.
1) Main/feed water control valve
With this control valve, the level in the boiler drum is regulated so that boiler feed water is continuously available in the boiler for steam generation. In order to compensate for the difference between the characteristic curve of the feed water pump and the operating characteristic of the boiler system, the characteristic curve of the feed water control valve must be designed accordingly.
2)Filling/feed water control valve
The boiler drum is filled by this control valve when the system is started up. Since a large differential pressure and cavitation have to be mastered during start-up, this valve is subject to high stress and thus wear. Therefore, this often small valve is equipped with a hard multi-stage trim and is located in parallel with the main feed water control valve, which must then be designed for maintaining the level.
3) Burner control valve on the boiler
This valve regulates the supply of natural gas to the gas burner or the heating oil to the oil burner on the boiler. During gas operation, the valve regulates to maintain the defined control characteristic and reduce noise. When heating oil is used, this valve functions as an overflow facility and holds the pressure upstream of the oil burner nozzle constant.
4) Sludge control valve
This valve quickly opens for a brief moment to drain a small quantity of boiler feed water for desludging the boiler water drum. Hard internal parts are required to withstand the high differential pressure, cavitation, and abrasion that prevail. The seat faces of this control valve are subject to wear, which is why we recommend installing an additional shut-off valve here.
5) Boiler start-up control valve
The start-up control valve typically blows steam through a silencer system into the atmosphere when the boiler plant is started. Since the steam expands with a high-pressure reduction, this valve usually has an asymmetric design.
6) Soot Blower Control Valve
The walls of the heat exchangers in the boiler are steam-cleaned of soot particles to optimize heat transfer efficiency inside the boiler. To this end, soot blower control valves feed live steam to the soot blower nozzles with minimum actuating time.
7) Air preheater control valve
The burner air is preheated to optimize the effectiveness of the combustion process. The temperature of the burner air is determined by the steam fed to the air preheater via this control valve.
8) 3-way mixing valve
Superheating the steam of the steam turbines while they are running increases plant efficiency and prevents the turbine blades from becoming damaged by condensed drops of liquid. For better energy utilisation of the generated steam, secondary overheating is installed in power plants with higher steam pressures. The heat transferred to the superheater varies greatly due to fluctuating loads and soot deposits in particular. The temperature of the superheater must therefore be regulated. The superheated steam is passed through a pipe coil by means of the 3-way mixing valve, which is located in the water-filled part of the steam drum. The colder drum water with the saturated steam temperature thus cools the superheated steam.
8) Boiler injection cooler
Another way of controlling the superheater temperature is usually implemented in new systems by injecting boiler feed water with a controllable injection cooler.
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We have all felt the impact of the supply chain issues, shipping delays and labor shortages. As we look forward into 2022, Neal Systems has been taking steps to ensure our customers are shielded from some of the avoidable problems that can occur when you have limited stock and limited staff. Our team has a large technician team with varying expertise areas that can provide expert level maintenance and engineering for you.
Our on-site calibrations, which are done via a tablet, generate certificates electronically and immediately. All information is stored securely in the cloud with full customer access to make searching, sorting and filtering certificates easy.
The technicians on our preventative maintenance team can perform a range of tasks from single instruments through to entire systems. They have experience in dealing with situations where no drawings or manuals currently exist and can reverse engineer those documents through site visits from highly experienced field personnel. This means we can either follow established PM procedures or design and document them from scratch.
Need on site-service on a whim? NSI has a range of unscheduled plans ranging from cost effective business hours, telephone only support, right through to 24/7/365 on-site support. All service plans get a dedicated telephone number that rings through directly to the service department during work hours and the on-call service tech during off hours.
Need a guarantee of on time shipment? For an annual fee, a customer can buy into the full guaranteed stock list with the knowledge that NSI will ship the same day if requested before 2pm.
NSI can even monitor your SCADA and PLC networks remotely to let you know if there are any problems before you even know yourself. These services can prevent downtown and limit the expenses associated with installation and instrumentation assistance.
These are just some of the services available to our customers. We look forward to assisting you with reliable, efficient and on-time services and solutions in 2022. For a complete list of available options schedule, a quick call with one of our team members today!
