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Title: Energy conserving process for calcining clay

Abstract

This patent describes an energy conversing process for calcining a clay. It comprises feeding a dry pulverized clay powder as feed material to a calciner to be calcined therein; passing the clay powder to be calcined through the calciner in direct heat exchange contact with a hot calcining gas passing therethrough whereby the clay powder is sufficiently heated to calcine substantially all the clay powder passing through the calciner and the hot calcining has is somewhat cooled; removing the calcined clay powder from the calciner and discharging the calcining from the calciner; subjecting the calciner discharge gas to electrostatic precipitation to clean the calciner discharge gas prior to venting the calciner discharge gas to the atmosphere whereby at least a substantial portion of calcined clay powder entrained in the calciner discharge gas is removed therefrom; collecting the hot calcined clay powder separated from the gas during electrostatic precipitation and mixing the collected hot calcined clay powder with the clay feed material being supplied to the calciner without substantially cooling the collected hot calcined clay powder prior to mixing with the feed material; and passing the calciner discharge has in heat exchange relationship with at least a portion of a coolingmore » fluid prior to subjecting the calciner discharge gas to electrostatic precipitation.« less

Inventors:
Publication Date:
OSTI Identifier:
6569813
Patent Number(s):
US 4948362; A
Application Number:
PPN: US s 7-270176
Assignee:
Georgia Kaolin Co., Inc., Union, NJ (USA) NOV; NOV-90-035002; EDB-90-165079
Resource Type:
Patent
Resource Relation:
Patent File Date: 14 Nov 1988
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 02 PETROLEUM; 54 ENVIRONMENTAL SCIENCES; CALCINED WASTES; ENERGY CONSERVATION; INDUSTRIAL WASTES; AIR POLLUTION CONTROL; CALCINATION; CLAYS; ELECTROSTATIC PRECIPITATORS; PULVERIZED FUELS; WASTE PROCESSING; CHEMICAL REACTIONS; CONTROL; DECOMPOSITION; EQUIPMENT; MANAGEMENT; MATERIALS; POLLUTION CONTROL; POLLUTION CONTROL EQUIPMENT; PROCESSING; PYROLYSIS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; THERMOCHEMICAL PROCESSES; WASTE MANAGEMENT; WASTES; 320305* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Industrial Waste Management; 020800 - Petroleum- Waste Management; 540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Baird, D.P. Energy conserving process for calcining clay. United States: N. p., 1990. Web.
Baird, D.P. Energy conserving process for calcining clay. United States.
Baird, D.P. Tue . "Energy conserving process for calcining clay". United States. doi:.
@article{osti_6569813,
title = {Energy conserving process for calcining clay},
author = {Baird, D.P.},
abstractNote = {This patent describes an energy conversing process for calcining a clay. It comprises feeding a dry pulverized clay powder as feed material to a calciner to be calcined therein; passing the clay powder to be calcined through the calciner in direct heat exchange contact with a hot calcining gas passing therethrough whereby the clay powder is sufficiently heated to calcine substantially all the clay powder passing through the calciner and the hot calcining has is somewhat cooled; removing the calcined clay powder from the calciner and discharging the calcining from the calciner; subjecting the calciner discharge gas to electrostatic precipitation to clean the calciner discharge gas prior to venting the calciner discharge gas to the atmosphere whereby at least a substantial portion of calcined clay powder entrained in the calciner discharge gas is removed therefrom; collecting the hot calcined clay powder separated from the gas during electrostatic precipitation and mixing the collected hot calcined clay powder with the clay feed material being supplied to the calciner without substantially cooling the collected hot calcined clay powder prior to mixing with the feed material; and passing the calciner discharge has in heat exchange relationship with at least a portion of a cooling fluid prior to subjecting the calciner discharge gas to electrostatic precipitation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 14 00:00:00 EDT 1990},
month = {Tue Aug 14 00:00:00 EDT 1990}
}
  • Carbonate rock calcining process of first and second separate successive steps is described which comprises: in the first step, heating metallic carbonate rock sufficiently to achieve sufficient partial conversion thereof to metallic oxide and carbon dioxide to form in the first step a partially calcined hot mass which itself contains sufficient retained heat for subsequently independently substantially completing the conversion of the remaining unconverted metallic carbonate therein in the second step substantially in the absence of supplying further heat thereto in the second step, and thereafter, in the second step, independently substantially completing the conversion of the metallic carbonate inmore » the hot mass from the first step to metallic oxide and carbon dioxide by such retained heat.« less
  • In a tumbler type of dryer, particularly for large capacity commercial and institutional laundries, a heating control system is provided which is responsive to the rate of increase of temperature of hot air leaving the dryer. When this temperature increase exceeds a preselected rate the dryer control system is automatically instructed to shut off or diminish the hot air supply, as well as the tumbler operation if desired. Thus energy is not wastefully consumed after the laundry is already dry; on the other hand, the dryer does not prematurely shut down while laundry is still damp, whereby the dryer mustmore » be started up again and energy again is unnecessarily wasted. Different settings are selected in accordance with the characteristics of the type of laundry being processed.« less
  • Some free water containing glass batch agglomerate formulations when attempted to be dried and heated in a vertical bed prior to being discharged to a glass melter for vitrification convert into large aggregates which cannot be suitably supplied to the melter. The present invention solves this process disabling aggregate formation by treating such agglomerates in a preconditioning chamber(S) prior to supplying them into a vertical bed so as to preclude serious aggregate formation in either the preconditioner or the vertical bed. Such treatment is employed in manufacturing glass with a fossil fuel fired melter or an electrically operated melter.
  • Chemical waste by-products are used in place of conventional heating fuels both for induration and chloridization of impure iron oxide. Pelletized iron oxide is hardened and purified simultaneously by exposure to the heat and combustion products generated from burning chlorinated organic by-products. Hydrogen chloride produced during this combustion reacts with trace metal impurities in the iron oxide to effectively remove substantially all such impurities as volatile metal chlorides. Conventional fuel and binder requirements are substantially reduced or completely eliminated through use of such by-products, while remedying the problem of their disposal.
  • An energy conserving process furnace has a recuperator to utilize heat derived from exhaust gases in order to reduce fossil fuel consumption of the furnace. Elongated, enhanced surface ceramic heat exchanger tubes are used in the recuperator to recover heat energy from the exhaust gas. A preferred sealing arrangement is used between the metal and ceramic tubes to contain the combustion air. Heat is added by the recuperator to combustion air used in a fluid fuel burner. The ceramic tubes are provided with vibration protective mechanisms to prolong useful life under severe mechanical vibration encountered in some applications. In amore » method of operating a slot furnace, exhaust gas is exhausted from a side of the furnace through the slot or a passageway having an elongated horizontal cross section. In the preferred arrangement a second passage or air curtain passageway is positioned adjacent the first passageway to permit proper gas flow through a recuperator. The recuperator is designed to recoup heat from exhaust gas in the first passageway and provide such heat as energy to heat combustion air used in the furnace. The second passageway by-passes the recuperator to avoid passing colder room air through the recuperator and to protect the operator from high temperature exhaust gas. The heat exchange ceramic tubes are designed to operate at temperatures of 1300/sup 0/F and above without damage and with good sealing properties between elements. The system preferably includes a recirculating burner means which acts to reduce the combustion air requirements and to provide a combustion zone low in oxygen so as to prevent scale formation and oxidation of metals being treated in the furnace area.« less