ISI CONTROL WEBLOG

 1. Condensate Drainage Control Valve (Variant I)
The drainage control valve regulates the level in the condenser and directs the condensate back to the boiler feedwater tank or to a process line (series 8C, 6N).

2. Condensate Circulation Control Valve (Variant I)
The circulation control valve regulates the minimum quantity in the condensate pump to prevent the pump from running dry. The spindle seal for this valve must be vacuum-tight so as not to influence the underpressure in the condenser, especially during start-up (series 8C).

3. Motive Steam Control Valve
The vacuum in the condenser is created using a steam-jet pump as the plant is started, when the turbine has not yet reached operating speed. Vacuum pressure is adjusted by the motive steam control valve (series 8C, 6H, 180).

4. 3-Way Distribution Valve (Variant II)
The aforementioned circulation control for regulating condensate drainage can also be realized with a 3-way distribution valve (series 200).

 1. Heating Steam Control Valve
The boiler feedwater is degasified in the degasifier on the boiler feedwater reservoir to all but remove the harmful gases of oxygen and carbon dioxide. This process takes place largely under overpressure (p = 0.1 - 0.4 barg), with a corresponding saturated steam temperature of 102 to 108 °C. The boiler feedwater tank is heated by a steam lance, placed in the liquid to mix it, and by adding steam from above. The steam is routed through the heating steam control valve, which must be fitted with noise-reducing fixtures (series 8C, 6N).

2. Boiler Feedwater Control Valve
This valve is used to regulate the boiler drum to ensure that there is always enough feedwater in the boiler to create steam. The boiler feedwater control valve must have an equal-percentage characteristic to compensate for the difference between the characteristic of the boiler feedwater pump and the boiler plant (series 8C, 6H, 350, 380).

3. Deionized Water Control Valve
Losses are encountered in the water-steam circuit as a result of desalination, desludging, and sampling but can be compensated with deionized water from the water treatment plant. Contaminants trapped in the untreated water in dissolved and solid form are removed in this plant. The deionized water control valve feeds the deionized water to the boiler feedwater circuit (series 8C, 6N).

4. Condensate Control Valve
The condensate that accumulates throughout the entire plant is fed back to the water-steam circuit using condensate control valves. Subsequent evaporation may occur as the condensate expands, depending on the pressure and temperature, and must be taken into account when selecting the cvs value and nominal outlet diameter (series 8C, 6N, 340).

5. pH Control Valve
The pH value of the deionized water is controlled by adding ion exchangers in the water treatment plant. Today, this task is assumed primarily by metering pumps but can also be carried out using pH control valves (series 8C).

 1. Main/Boiler Feedwater Control Valve
This valve is used to regulate the boiler drum to ensure that there is always enough feedwater in the boiler to create steam. The boiler feedwater control valve must have an equal-percentage characteristic to compensate for the difference between the characteristic of the boiler feedwater pump and the boiler plant (series 8C, 6H, 350, 380).

2. Fill/Boiler Feedwater Control Valve
This valve fills the boiler drum when the plant is started. Sizable differential pressure and cavitation must be controlled at this time, subjecting the valve to high forces and, thus, wear. Often small in design, it is equipped with hard, graduated valve trim and is positioned parallel to the main boiler feedwater control valve (series 8C, 6H, 180, 350).

3. Burner Control Valve
The burner control valve regulates the supply of natural gas to the gas burner or heating oil to the oil burner for 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 (series 8C, 6N).

4. Blow-down Control Valve
This valve quickly opens for a brief moment to drain a small quantity of boiler feedwater 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 (series 8C, 6H, 180, 350, 380).

5. 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. The valve almost always has an asymmetrical shape because steam expands when pressure is suddenly reduced (series 8C, 6H, 350, 380).

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, sootblower control valves feed live steam to the sootblower nozzles with minimum response time (series 6H, 180, 350, 380).

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 (series 8C, 6N).

8. 3-Way Mixing Valve (Variant I)
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. An intermediate superheating facility is installed for power plants with higher steam pressures to better harness the energy produced by the steam. 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. To this end, hot steam is channeled through a serpentine in the water-filled section of the steam drum via the 3-way mixing valve. The colder drum water, at saturated steam temperature, thereby cools the hot steam (series 200, 220).

9. Injection Cooler (Variant II)
Another common way of regulating the superheater temperature for new plants is to inject boiler feedwater using a controllable injection cooler

High-performance ECOTROL® valves and steam-conditioning stations from Arca are used around the clock in many industrial power plants. While ECOTROL® valves execute the wide variety of control tasks associated with boiler feedwater, heating oil and gas, condensate, and LP steam, steam-conditioning stations reduce high pressure and temperatures. The valves are connected between the steam generator and peripheral equipment.

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