, power station valve - Plant regulator correctly choose

power is one of the most important energy industry, there are steam, wind, hydro, geothermal, tidal power, solar power, this kind of power station will have in common is that water into steam, using steam to drive a steam turbine turns a generator to produce electric power, the difference is turning water into steam energy each are not identical. All kinds of plant structure is roughly same, simple view of power flow diagram is, in fact, water, steam cycle process, in this process to choose the regulator is both simple and complex. Simple is simple process medium, only two kinds of water and steam, water is complex and steam temperature and pressure range is big, bring a series of problems such as: flashing, cavitation, erosion, corrosion, noise. But the first thing to consider is safety and reliability of regulating valve.

we process according to the system of regulating valve selection.

1, feed valve, deputy boiler feed water valve, compound feed water regulator

a. Control requirements: control boiler into the water, to maintain the economic level and steam flow.

b。 General condition requirements: boiler startup valve pressure - 100 300 kilograms, flow is small, when normal operation of the pressure difference is small, large flow, flow adjustable ratio of 75:1 - 100:1.

c。 : the valve body is made of WCB/WC9, for double valve cavitation resistance starting valve in the system requirements, to V closed ranks, the complex characteristics of the utilization of feed valve need to trim at the same time meet the needs of the boiler startup and normal operation. General valve selection for the failure, ( Need to be aware of is generally for the water to remove dissolved oxygen will join diammonium for processing, it will be on the SATELLITE 6 alloy or other similar alloy adverse reaction, so it's best not to use 316 + STELLITE trims the method of surfacing welding processing, can be directly choose 416 stainless steel material) 。

2, boiler feed pump minimum flow circulation valve

a. Control requirements: the boiler feed water pump start-up and safe operation and eliminating because flow is too small, temperature increase, water pump cavitation damage. ( Old power stations have to use the minimum flow control Industrial Valves switch type, as well as the use of mechanical pump automatically circulating valve) 。

b。 Condition: the pressure drop of - 160 350 kilograms, is the largest power station in the system under differential pressure valve, flow generally 30% of the normal flow.

c。 requirements: resistance to cavitation, block structure, grade V seal level, the pump start and stop running when the valve work continuously, pump normal times since the start valve valve, valve is usually a failure.

3, high/low heater drain valve feed water heater hydrophobic, condensed water heater hydrophobic

a. Control requirements: control the location of condensed water heater, timely will be condensed water discharge, high water discharge, namely hydrophobic normal water level.

b。 Condition: the medium is saturated water, heater control valve differential pressure is commonly between 6 - 30 kg, the last level of trap connected directly to the condenser or deaerator.

c。 requirements: resistance to flash scour, V or VI levels of seal, valve is usually a failure.

4, deaerator water level control Industrial Valves

a. Control requirements: provide traffic maintain the normal water level, deaerator eliminated by adding steam temperature gas dissolved in the water.

b。 Condition: startup phase flow is small, the differential is bigger, normal flow, small pressure difference, working condition of similar feed valve.

c。 requirements: effective during low flow resistance to cavitation.

5, desuperheating valve ( Attemperator)

。 Control requirements: the high pressure water injection into the steam to steam temperature control requirements.

b。 Condition: the medium is water, the pressure difference is bigger, the valve requirements: a variety of types: type nozzle, auxiliary atomization type, self-contained type and type to the clamp.

6, (the temperature and pressure-releasing valve High and low pressure bypass valve)

。 Control requirements: the high temperature and high pressure steam adjusting to a certain temperature and pressure; To the turbine to provide a bypass channel, boiler turbine and work independently.

b。 Condition: high temperature and high pressure steam to reduce temperature and pressure relief.

c。 requirements: thermal shock, noise reduction, response quickly.

These gate valve os & y valve fire protection are meant to serve as a guide for business owners on how to both identify potential opportunities for transformative innovation and how to adapt to the constantly changing technologies of today.
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