TH23237A - How to replace sludge from paper mills to another material? - Google Patents

Abstract

Sludge from paper mills or similar high-ash organic sludge is converted by incinerating it in a cyclone kiln in combination with other fuels. This process captures the sludge's heat and transforms its ash content into a glassy molten residue. Additives such as limestone may be added to the molten residue before it enters the cyclone kiln. The molten residue is useful as a construction material, abrasive, for roofing products, or for other purposes.

Claims (13)

1. A method for converting sludge from paper mills and other similar organic sludge with high ash content, which involves feeding the sludge into a cyclone combustion chamber along with a secondary fuel source to burn the sludge, collect heat from the sludge, and convert the ash content of the sludge into molten sludge. 2. The method under Reputation 1, where the sludge contributes approximately 10% to approximately 40% of the total heat contributed to the kiln. 3. The method under Reputation 1 where the sludge provides a heat input to the furnace that exceeds 50% of the total heat input to the furnace. 4. The method under Claim 1 in which the sludge is dried to the appropriate moisture content for processing before being fed into the cyclone kiln. 5. Methods for converting paper mill waste and other similar organic sludge with high ash content, which include drying the sludge to a moisture content of approximately 20% or less, and incinerating the dried sludge in a cyclone combustion chamber with a secondary fuel source to retain the calorific value of the sludge and convert the ash content into molten residue. 6. The method described in Claim 5, combined with the procedure for agglomerating the sludge into small, rounded balls before incineration. 7. Methods for transforming ash in sludge containing significant organic matter and with an ash content of approximately 20% to 50% dry weight include sludge combustion in a cyclone furnace to produce a hard, strong, and durable glass-like sludge that includes the ash, and the separation of the sludge from the furnace. 8. The method under claim 7, where the sludge is dried to a moisture content of approximately 20% or less before firing. 9. The method under claim 7, in which molten slag is molded into a glass-like product. 10. The method under claim 7 in which the molten residue is transformed into fibers. 11. The method of delivering fuel to the cyclone combustion furnace involves simultaneously delivering natural gas and, at the same time, delivering sludge from paper mills or other similar organic sludge with a high ash content. 12. Methods of fuel delivery to the cyclone kiln include delivering sludge from paper mills or other similar organic sludge with a high ash content; and simultaneously delivering one or more additional types of fuel into the kiln. 13. The method under claim 12 in which the sludge provides the highest mass flow rate of any fuel fed into the furnace.