HomenewsWhy to Use TDS value to Control Boiler Surface Blowdown ?

Why to Use TDS value to Control Boiler Surface Blowdown ?


Boiler surface blowdown based on TDS value


The best solution to boiler surface blowdown is automatic TDS blowdown. The sensor in the blowdown system regularly detects the TDS concentration of the boiler water, compares the detection results with the set value of the controller, and then controls the action of the blowdown valve. The use of automatic control can control the TDS concentration close to the maximum allowable value to avoid steam carryover and foaming caused by high TDS concentration. Precise control can reduce the amount of sewage to a minimum, save energy, and ensure steam quality. Greatly reduce operating costs.


The control system measures the conductivity of the furnace water, which is directly related to the concentration of dissolved solids (TDS). The conductivity of the boiler water is compared with the set value in the controller. If the conductivity is lower than the set value, the drain valve will close and remain closed at the end of flushing. If the conductivity is higher than the set value, the drain valve will remain open after flushing until the boiler water TDS is lower than the set value.
Necessity of bottom TDS sewage discharge:

Excessive boiler bottom blowdown can cause great losses of heat energy and water treatment chemicals, so it is very important to keep the blowdown volume to a minimum.

In order to minimize energy loss and ensure that the total dissolved solids (TDS) concentration of the boiler water is controlled within the design range, it is recommended that the boiler also install an automatic TDS control system.

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