Steel rolling heating furnace

Abstract

The invention provides a steel rolling heating furnace which is characterized in that a hearth of the steel rolling heating furnace comprises a preheating section, a heating section and a soaking section which are arranged sequentially, wherein a retaining wall is arranged between the heating section and the soaking section; a metal pipeline is arranged in the retaining wall; one end of the metal pipeline is connected with a descending pipe of a steam drum; the other end of the metal pipeline is connected with an ascending pipe of the steam drum; and water separated from a steam-water mixture in the steam drum enters the metal pipeline from the descending pipe, absorbs heat of the retaining wall in the metal pipeline, then forms a steam-water mixture and enters the steam drum from the ascending pipe. Compared with the prior art, the metal pipeline in the retaining wall between the heating section and the soaking section of the steel rolling heating furnace is cooled by water cooling rather than evaporated cooling, and can share an evaporated cooling system with a furnace reinforcement pipe without reconstructing a cooling water system additionally, so that the steel rolling heating furnace has the advantages of investment saving, energy saving and consumption reduction, can recycle the heat, is good in cooling effect, and can avoid an accident that the retaining wall collapses due to scale formation of an inner wall of a suspension steel pipe of the retaining wall.

Description

technical field [0001] The invention relates to a heating furnace, in particular to a rolling heating furnace used in a rolling mill. Background technique [0002] The steel rolling heating furnace is the main heating equipment in the rolling mill. Its function is to heat the billet to a temperature that is easy for the rolling mill to roll. The hearth of the steel rolling heating furnace includes a preheating section, a heating section, and a soaking section. In the preheating section, the billet is preheated by the flue gas heat from the fuel combustion of the heating furnace. This section is dominated by convective heat transfer and supplemented by radiation heat transfer. The flue gas temperature is generally around 800 °C. The heating section is the main heating section, and the furnace temperature is increased to intensify the heating of the billet. The furnace temperature in this section is generally around 1200°C, and the billet is mainly heated by radiation heat tr...

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Problems solved by technology

[0006] The object of the present invention is to provide a steel rolling heating furnace to solve the problem that in the prior art, the furnace rib tube adopts vaporization cooling, and the cooling of the metal pipe in the retaining wall between the heating section and the soaking section of the steel rolling heating furnace adopts water cooling, It is necessary to build another cooling water system, which not only wastes money, but also consumes a lot of electricity by the circulating water pump, and the heat of the cooling water cannot be recovered. Cooling effect, also technical problems that may lead to accidents in which the retaining wall collapses

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