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Furnace with multiple heat recovery systems

A melting furnace and heat-generating technology, applied in the field of glass manufacturing, can solve the problems of unsuitable air-burning regenerative or reheating furnaces

Inactive Publication Date: 2011-10-26
PRAXAIR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such radiant raw meal / cullet preheaters have so far been considered unsuitable for use in air-fired regenerative or recuperative furnaces

Method used

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  • Furnace with multiple heat recovery systems
  • Furnace with multiple heat recovery systems
  • Furnace with multiple heat recovery systems

Examples

Experimental program
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example

[0056] Table 1 shows an illustrative comparison of energy balances for: (Case 1) 450 short tpd regenerative vessel glass melting furnace with five ports to regenerative indirect heat exchangers; (Case 2) Same furnace with conventional raw cullet preheater preheating raw / cullet to 572°F; (Case 3) Modified 450 short tpd regenerative vessel glass melting furnace with There is a first pair of ports that converts to continuous vent line ports according to the invention to preheat raw / cullet to 932°F; (Case 4) Modified 450 short tpd regenerative vessel glass melting furnace , with a first pair of ports converted to continuous snorkel ports and a second pair of ports closed and replaced by one or two pairs of oxy-fuel burners according to the invention , to preheat raw / cullet to 932°F. Table 2 shows the corresponding conditions and assumptions for the performance of these regenerators.

[0057] In all cases a 50:50 mix of raw material to cullet was assumed. Case 1 represents the b...

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Abstract

In a furnace such as a glassmelting furnace, a portion of the combustion products formed by combustion of fuel with gaseous oxidant within the furnace are passed through a recuperative or regenerative heat exchanger system to heat a portion of the incoming gaseous oxidant, and a portion of the combustion products are passed instead through a secondary heat exchanger system, wherein the hot combustion products and oxidant which are passed through said first heat exchanger are passed at a heat capacity rate ratio of combustion products to oxidant of less than 1.3.

Description

technical field [0001] This invention relates to the energy efficient manufacture of glass in a furnace, and more particularly to a method of recovering heat from hot combustion products formed in a combustion which is carried out to produce heat for melting the glassmaking material. Background technique [0002] Many industrial operations employ furnaces in which a fuel and an oxidant are combusted so that the heat of combustion heats the materials in the furnace. Examples include furnaces that heat solid materials to melt them, such as those that melt glass. Other examples include furnaces that heat a solid material or item, such as a steel plate, to raise the temperature of the material (so long as it does not melt it) to facilitate shaping or other processing of the material or item. The challenges faced by melting furnaces are illustrated in glass melting furnaces, and much of the invention is described herein with reference to glass melting furnaces, but the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B3/02C03B5/235C21D1/00C22F1/04F23L15/00F27B3/26F27D17/00
CPCC03B5/235C03B5/2353C03B5/237F23L15/00F27B3/266F27D17/004F27D17/008C03B3/023Y02P40/57Y02E20/34Y02P40/50C03B3/02C21D1/00
Inventor H·科巴亚施
Owner PRAXAIR TECH INC
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