An Indian pulp and paper customer noticed that their MC pump was not up to par and sought help in reaching the targets on their production line. They suffered from low kappa reduction and high chemical consumption in the oxygen delignification stage. This was mainly due to the O2 stage feed pump limiting the pulp consistency. Their existing, ill-performing MC pump was not able to pump a consistency higher than 7%. Because of this, the steam capacity of the mill was not able to heat the pulp flow to the target temperature. Also, the desired top pressure in the oxygen reactor was not achieved.
The customer contacted Sulzer to analyze the O2 stage, calculate the pumping head at predetermined reactor pressures, and select more suitable and efficient MC equipment to reach the target process conditions. Sulzer’s experts visited the mill site, analyzed the whole pumping system, and calculated the required pump duty point. As a result of the thorough research, the client’s old pump was replaced by Sulzer’s MCE22-100-V, a high-quality MC pump with internal degassing.
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