AP-21 Pulp & Paper Stock Bleaching ©PSX2010 AP-21 10-0910 Application: Direct Steam Injection Heating for Pulp Stock Heating & Bleaching Bleaching in the Pulp and paper industry are the processes that lighten and/or remove lignin from the pulp in order to brighten its appearance. Like most chemical reactions, temperature is a key variable in controlling the effectiveness of the bleaching process. To improve chemical performance, stock is often heated by sparging steam into the pulp line prior to the addition of bleaching chemicals. The high viscosity and fibrous nature of the pulp makes condensing the steam difficult and can lead to noise and vibration. In addition, the spargers can plug with pulp due to low steam pressure available at the sparger downstream of the s

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