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Cooling system for a metallurgical furnace

A cooling system, metallurgical furnace technology, applied in the direction of cooling devices, etc., can solve the problem of frequent discharge of emergency cooling system, etc.

Inactive Publication Date: 2003-03-05
PAUL WURTH SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is especially troublesome if a short power failure causes the emergency cooling system to discharge fairly frequently

Method used

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  • Cooling system for a metallurgical furnace
  • Cooling system for a metallurgical furnace
  • Cooling system for a metallurgical furnace

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Embodiment Construction

[0020] In FIG. 1 , reference numeral 10 refers to a blast furnace cooling circuit comprising a cooling water inlet 12 and an outlet 14 . This cooling circuit 10 is subdivided into the blast furnace components to be cooled, ie vertical cooling plates and cooling boxes of the furnace walls, tuyeres and hot blast equipment. A return line 16 connects the outlet 14 with the inlet 12, forming a closed cooling circuit. Near the outlet 14, at the top of the blast furnace, the return line 16 includes a degasser 18 in which the heated cooling water is substantially free of gas. At this highest point of the cooling water circuit 10 there is also a closed expansion vessel 20 through which pressurized gas (such as N 2 ) for pressurization. This gas helps to ensure that the pressure in the cooling circuit is sufficiently high that the cooling water in said cooling circuit 10 has no risk of evaporating. The expansion vessel is also provided with low and high water limit switches and an al...

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Abstract

A cooling system for a blast furnace includes a cooling circuit closed by a return line and at least one circulation pump for circulating cooling water through the closed cooling circuit. An emergency feed line with an emergency feed valve, which opens in case of a power failure, is connected to the cooling circuit. An emergency overflow valve is located at the highest point of the closed cooling circuit. This emergency overflow valve opens in case of a power failure, so that the closed cooling circuit becomes an open cooling circuit with an atmospheric pressure discharge at its highest point. A pressure vessel, which is connected to the emergency feed line, contains a certain volume of emergency water which is pressurised by a gas, so that, in case of a power failure, an emergency water flow establishes through the open cooling circuit.

Description

technical field [0001] The invention relates to cooling systems for metallurgical furnaces, especially blast furnaces. Background technique [0002] A known blast furnace cooling system is a cooling water circuit in which the cooling water is circulated in a closed circuit by means of an electric circulation pump. The components of the blast furnace to be cooled (i.e. vertical cooling plates and cooling boxes of the furnace wall, tuyeres and hot blast equipment) are recombined into multiple parallel branches or sub-circuits, which are hydraulically balanced so that a predetermined flow of cooling water circulates through each sub-circuit. A common return line comprising one or more heat exchangers closes the cooling loop. [0003] In the event of a power failure, cooling is discontinued due to the inoperability of the electric circulation pump. In order to prevent damage to cooling components in such situations, it is known to provide an emergency cooling system. This em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/10
CPCC21B7/103
Inventor 吉安·K·利罗伯特·施梅勒
Owner PAUL WURTH SA
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