The Role and Importance of HP MSR Drain Tanks in Power Plants with Reheat Steam Turbines

HP MSR drain tanks, #1 Extraction Steam

HP MSR, or High Pressure Main Steam Reheat, drain tanks are used in power plants and industrial facilities that have reheat steam turbines

HP MSR, or High Pressure Main Steam Reheat, drain tanks are used in power plants and industrial facilities that have reheat steam turbines. These drain tanks are part of the steam cycle system, specifically designed to collect and remove excess condensate and impurities from the reheat steam line.

#1 Extraction Steam refers to the first extraction point in the steam turbine where a portion of the high-pressure steam is extracted for various purposes, such as feedwater heating or process steam. This extracted steam is diverted from the main steam flow and sent to the corresponding extraction steam system.

Now, let’s discuss the purpose and operation of HP MSR drain tanks in relation to #1 Extraction Steam.

The primary purpose of HP MSR drain tanks is to collect and remove condensate, impurities, and any carryover from the #1 Extraction Steam. When high-pressure steam is extracted from the main steam flow, it undergoes expansion and cooling, leading to the formation of condensate. This condensate has the potential to cause damage to downstream equipment if not properly removed.

The HP MSR drain tank is typically installed downstream of the extraction steam line, just before it enters the condensate system. The extraction steam, along with any entrained water, enters the drain tank. The tank provides a reservoir where the condensate can separate from the steam and settle at the bottom.

To ensure effective separation and removal of the condensate, HP MSR drain tanks employ various techniques. These techniques include steam/liquid separators, baffles, and drain valves. The steam/liquid separators help in separating the steam from the condensate, allowing the steam to exit the drain tank while the condensate settles at the bottom. Baffles are used to prevent the carryover of steam into the condensate outlet or downstream system. Drain valves are used to remove the collected condensate from the drain tank periodically.

It is important to regularly drain the collected condensate from the HP MSR drain tank to prevent any potential damage to downstream equipment and maintain efficient steam turbine operation. The drained condensate is typically directed to a condensate recovery system, where it can be treated and reused as feedwater for the boiler.

In summary, HP MSR drain tanks are an essential component in power plants and industrial facilities with reheat steam turbines. They provide a means to collect and remove condensate and impurities from the #1 Extraction Steam, ensuring the efficient and safe operation of the steam cycle system.

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