MINIMIZATION OF CARBONATE DEPOSITS ON THE HEAT TRANSFER SURFACES OF HEAT EXCHANGERS IN THE QUENCH WATER CIRCUIT OF A FLOW GASIFICATION INSTALLATION

WIPO Patent Application WO/2011/064099

A3

The invention relates to a method for minimizing carbonate deposits on the heat transfer surfaces of heat exchangers in the quench water circuit of a flow gasification installation wherein the excess quench water from the quencher (1) is calmed and cleaned (2) and raised to the operating pressure of the gasification installation (3), carbon dioxide is dosed to the quench water (4) at such an amount that a lime-carbonic acid ratio results that equals at least the prevailing lime-carbonic acid weight, the quench water is heated at maximum to a temperature at which the dissolved content of carbon dioxide in the pre-heated process water is over the content of carbon dioxide before the pressure increase of the process water and the pre-heated quench water is supplied to the quencher for cooling the raw gas. According to the invention, an excess of carbon dioxide in the process water is achieved by the solution of carbon dioxide, which has lime-dissolving effects.

JPS5742397	REMOVAL OF OXIDE SCALE
JP3273956	METHOD FOR PREVENTING GENERATION OF CALCIUM SULFATE-BASED SCALE AND AGENT THEREFOR

ADLER DIETMAR (DE)
FISCHER NORBERT (DE)
LAMP JOACHIM (DE)
SCHULZ KATJA (DE)

PCT/EP2010/067256

December 29, 2011

November 11, 2010

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SIEMENS AG (DE)
ADLER DIETMAR (DE)
FISCHER NORBERT (DE)
LAMP JOACHIM (DE)
SCHULZ KATJA (DE)

C02F5/08; C02F1/66; C10J3/84; C10J3/86

DE102007037860A1	2009-02-19
DE3533328A1	1986-03-27
US5720884A	1998-02-24
US20080006587A1	2008-01-10
EP0102401A1	1984-03-14
EP0648828A2	1995-04-19

SIEMENS AKTIENGESELLSCHAFT (München, DE)

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