ARTIGO TÉCNICO / TECHNICAL ARTICLE

O PAPEL vol. 76, num. 5, pp. 55 - 57 MAY 2015

ABSTRACT

Congruent phosphate control is the boiler water internal treatment most widely used in many industries, such as pulp and paper, chemical, petrochemical and in many applications for the power generation. The great benefit lays on the ability of this program to absorb small quantities of contaminants, such as acid, caustic, liquors and others. The big challenge is to maintain the Na:PO4 ratio inside the established limits. If the boiler chemistry is controlled within these limits, the risks of deposition and many forms of corrosion are practically neglected. Due to contaminations and steam production variation, manual systems produce irregular results of “in box time” on the control charts. The first generations of automated systems brought excellent results, with a high percentage of in box time. OnGuard iController, the controller presented in this paper, raised significantly this control, providing much more reliable results to the boiler water treatment. The system description shows the equipment benefits and its capabilities. Along with the description, two case histories are described and show precise conclusions for this controller.

Keywords: automation, congruent phosphate, in box control, Na:PO4 ratio, OnGuard iController.

* Author’s references:

1. B. Sc. Chemical Engineer, Applications Leader, Solenis Especialidades Químicas Ltda. – Industrial Water Technologies Division, Brazil

Corresponding author: Anderson José Beber. Industrial Water Technologies Division. Rua dos Pinheiros, 870 21o andar, São Paulo – SP, 05422-001, Brazil. Phone +55 11 30899225 (office) + 55 47 91864948 (mobile). E-mail: ajbeber@solenis.com