multiple hearth furnace patent

US8382471B2 - Multiple hearth furnace - Google Patents

A multiple hearth furnace including a rabble arm with a tubular structure and a solid plug body. The latter is received in a socket arranged in an arm fixing node. It has an axial through boring...

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multiple hearth furnace, BSP Thermal Systems Inc. Overview

A unique high volume processing method, the BSP multiple hearth furnace offers size flexibility, precise temperature and atmosphere control, maximum heat exposure, and considerable process versatility at low operating and maintenance costs.

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multiple hearth furnace, BSP Thermal Systems Inc. History

During the early 1900's Pacific Foundry Company started producing multiple hearth furnaces for ore roasting applications. Around the same time, Nichols Engineering obtained patent rights to the Herreshoff furnace which soon became the industry standard.

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US20040123785A1 - Method of operating a multiple hearth ...

A method of operating multiple hearth furnace ( 10 ) with a plurality of vertically aligned hearth floors ( 361, 362, 363, 364, 365 ), comprises in particular following steps. A first material is...

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US20040123785A1 - Method of operating a multiple hearth ...

A method of operating multiple hearth furnace ( 10 ) with a plurality of vertically aligned hearth floors ( 361, 362, 363, 364, 365 ), comprises in particular ...

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Multiple hearth furnace - Wikipedia

Working. The multiple hearth furnaces consist of several circular hearths or kilns superimposed on each other. Material is fed from the top and is moved by the action of rotating "rabble arms", and the revolving mechanical rabbles attached to the arms move over the surface of each hearth …

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Analytics for US Patent No. 8382471, Multiple hearth furnace

A multiple hearth furnace including a rabble arm with a tubular structure and a solid plug body. The latter is received in a socket arranged

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US4842051A - Rabble arm used in multiple hearth furnace ...

A rabble arm adapted to be connected to a rotatable center shaft of a multiple hearth furnace includes an elongated tubular member having an open end portion and an opposite closed end portion. The tubular member has an outside surface of substantially oval cross-sectional configuration and an inside surface arranged to form a hollow interior portion connected with the tubular member open end ...

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Multiple hearth furnace for reducing iron oxide (Patent ...

13-03-2012· Abstract. A multiple moving hearth furnace (10) having a furnace housing (11) with at least two moving hearths (20) positioned laterally within the furnace housing, the hearths moving in opposite directions and each moving hearth (20) capable of being charged with at least one layer of iron oxide and carbon bearing material at one end, and being capable of discharging reduced material at …

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US4505210A - Multiple hearth furnace chamber - Google Patents

- Google Patents A multiple hearth furnace chamber where each arched or conical hearth is independently supported by the outer metal shell. An expansion joint …

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Multiple hearth furnace - Paul Wurth S.A.

Multiple hearth furnaces (MHFs) have been used now for about one century for heating or roasting many types of material. They comprise a plurality of hearth chambers arranged one on top of the other. Each of these hearth chambers comprises a circular hearth having alternately a central material drop hole or a plurality of peripheral material drop holes therein.

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MODERN APPROACHES TO CONTROL OF A MULTIPLE HEARTH FURNACE ...

Author: José Valentín Gómez Fuentes Title of thesis: Modern Approaches to Control of a Multiple Hearth Furnace in Kaolin Production Department: Chemical and Metallurgical Engineering Field of research: Process control Supervising professor: Professor Sirkka-Liisa Jämsä-Jounela Thesis advisor(s): Thesis examiner(s): Emeritus Professor Kauko Leiviskä; Professor Ian K. Craig

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Multiple Hearth Furnace Combustion Systems - Industrial ...

Multiple Hearth Furnace Combustion Systems. IFCO combustion system on a 14'-3" Multiple Hearth Furnace. The combustion system is the heart and soul of the industrial furnace. While a few processes will run without added heat, many processes need the combustion system to add heat to the furnace continuously. All furnaces need a combustion system ...

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MP PYRO C2522 World's largest multiple hearth furnace - Jord

C2522. World's largest multiple hearth furnace. At 7.85m in diameter and comprising 17 gas-fired hearths, Jord's magnesia calciner is as big as they get. Home /. Mineral Processing /. Pyro systems /. World's largest multiple hearth furnace. Share this Page. As EPCM contractor, Jord's brief was to all but double plant capacity by adding ...

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US20040157182A1 - Multiple hearth furnace - Google Patents

A multiple hearth furnace comprises at least one cleaning lance inlet port ( 52, 54 ) radially leading into one of its hearth chambers ( 24 ). A cleaning lance assembly ( 40′, 40 ″) includes an elongated mount ( 42 ) and at least one cleaning lance ( 48, 50 ) slidably mounted on the elongated mount ( 42 ). Each cleaning lance ( 48, 50 ) is connected to a cleaning fluid distribution system ...

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Method of operating a multiple hearth furnace by Paul ...

05-06-2014· Get details on patent AU2002315327 - Method of operating a multiple hearth furnace by Paul Wurth S.A. and more at IP in Australia

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Control Strategy For A Multiple Hearth Furnace

and multiple hearth furnaces (MHF) are broadly utilised in industry for calcination of kaolin. However, maintaining efficient process operations is still hard in mineral processing [1]. The calciner control framework assumes a significant part in guaranteeing the uniform product quality while augmenting

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US Patent Application for MULTIPLE HEARTH FURNACE Patent ...

A multiple hearth furnace comprises at least one cleaning lance inlet port (52, 54) radially leading into one of its hearth chambers (24). A cleaning lance assembly (40′, 40″) includes an elongated mount (42) and at least one cleaning lance (48, 50) slidably mounted on the elongated mount (42). Each cleaning lance (48, 50) is connected to a cleaning fluid distribution system (56) and ...

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Alternative fuels for multiple-hearth furnaces (Journal ...

Patent Lewis, F M. The present invention relates to a method for efficiently incinerating waste material, particularly dewatered sludge, in a multiple hearth furnace by controlling the temperature of the individual hearths of the furnace within certain prescribed …

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System for controlling the operation of a multiple hearth ...

In a multiple hearth furnace having a plurality of superposed hearths defining an upper drying zone, an intermediate combustion zone and a lower cooling zone, said furnace comprising: an opening in the upper end of the furnace through which a mixture containing a combustible material and water is introduced into the furnace.

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US7735434B2 - Multiple-hearth furnace - Google Patents

US7735434B2 - Multiple-hearth furnace - Google Patents Multiple-hearth furnace Download PDF Info Publication number US7735434B2 ... 2005-04-13 Priority to PCT/EP2005/051628 priority patent/WO2005119153A1/fr 2007-02-28 Assigned to PAUL WURTH S.A. reassignment ...

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2.2 Sewage Sludge Incineration

The multiple hearth furnace was originally developed for mineral ore roasting nearly a century ago. The air-cooled variation has been used to incinerate sewage sludge since the 1930s. A cross-sectional diagram of a typical multiple hearth furnace is shown in Figure 2.2-1.

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Multiple Hearth Furnaces | Multi Hearth Incinerator ...

Multiple Hearth Furnaces. Having built or repaired over 300 of the 500 American Multiple Hearth Furnaces (MHFs) in existence, our experience has kept us aware of the issues and concerns of multiple hearth furnace owners and operators. We have constructed and rehabilitated Multi Hearth Furnaces in 47 American States (including Alaska), Puerto ...

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What is a multiple hearth furnace? | Multiple Hearth ...

Multiple Hearth Furnaces use burners to heat the furnace, and dry-out the refractory before feed is initiated. Then burners are used to maintain temperatures as needed. The burners can burn any fuel. Most common are fossil fuels (Natural Gas, Propane, Oil) but other fuel sources are possible.

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Cocurrent oxidation method in a multiple hearth furnace ...

A method of oxidizing feed materials using a multiple hearth furnace comprises the steps of introducing the feed materials to be oxidized on at least the uppermost hearth, introducing fuel/air mixtures in the uppermost hearth to dry and ignite the feed materials, introducing air on at least one hearth to support combustion of the feed materials, allowing the feed materials to move downwardly ...

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US Patent for Multiple-hearth furnace Patent (Patent ...

Multiple-hearth furnace Apr 13, 2005 - Paul Wurth S.A. The inventive multi-level furnace comprises a furnace wall delimiting a cylindrical space having a vertical axis, a plurality of beds defining the levels inside said cylindrical space and at least one scraping arm which is provided with a wall scraper and associated with the bed in such a way that it is rotatable about the vertical axis of ...

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Simplified mechanistic model of the Multiple Hearth ...

This work considers a multiple hearth furnace used for kaolin calcination (Figure 1). The furnace has eight hearths, and eight burners located in hearths 4 and 6. The temperature of the solid increases as it travels down through the furnace and reaches its maximum in Hearth 6. Kaolinite transforms to metakaolin at the temperature between 400 ...

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Feed distributor for multiple hearth furnace - Lurgi ...

Feed distributor for multiple hearth furnace. United States Patent 4442782. Abstract: A multiple hearth furnace feed distributor including a conical table feeder attached to the center shaft of the furnace for rotation therewith, together with a stationary convolute plow …

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