The desuperheater consists of a vessel with a built-in nozzle arrangement for injecting and cooling superheated steam in a water bath. The system is suitable for all applications where an effective conversion of superheated steam into saturated steam is required. Desuperheaters are available for different operating loads in both the horizontal and vertical design. The units are custom designed for each application and process, and meet essential thermodynamic requirements to achieve optimal performance.
The system’s maximum temperature for superheated steam is +380℃. Superheated steam is injected through a nozzle into a water bath, where some of the energy of the steam is given up to the cooling water, with some of the cooling water being vaporised and entrained as saturated steam. The maximum residual moisture content of the steam is 2%.
The desuperheater features an integral water separator that prevents the cooling water from being carried along into the steam line during peak loads. The level electrode NRG or NRGT detects the cooling water level and an electronic control unit ensures that the vaporised cooling water is replaced by make-up water. The cooling water at the required upstream pressure is fed into the lower part of the desuperheater via a control valve or a solenoid valve. If the temperature of the steam is very high, the cooling water must be heated up.
The water-bath desuperheater is the only steam cooling system that supplies saturated steam over a control range of 0–100%.