procedures for the settlement of the hu00f6henstandes and consistency in a teilstoffdosierbehu00e4lter

摘要

A method for regulation of the surface level (L20) and the consistency (Cs20) in a stock chest (20) for metering of a component stock (M1). Stock is fed as an outward flow (F11) out of the bottom portion (10a) of a stock column (10) by means of a first pump (11) into the stock chest (20). Into this outward flow (F11) a first dilution water flow (F15) is passed, by means of which dilution water flow the consistency of the stock fed into the stock chest (20) is regulated to the desired level. The stock is fed as a metering flow (F1) from the stock chest (20) by means of a third pump (21) into the short circulation of the paper or board machine. The surface level (L20) in the stock chest (20) is kept invariable by means of an overflow (F13) passed from the stock chest (20) into a pumping tank (20a). From the pumping tank (20a) stock is fed as a return flow (F12), by means of a second pump (12), back into the bottom portion (10a) of the storage tower (10). Into this return flow (F12) a second dilution water flow (F16) is passed, by whose means the consistency in the bottom portion (10a) of the storage tower (10) is regulated to the desired level. The stock (M1) is stirred intensively in the bottom portion (S10) of the storage tower (10) and in the stock chest (20, S20) in order to provide a uniform consistency.