Valve plate of hot air valve

Abstract

The present invention relates to a valve plate of hot air valve adopted for iron-smelting in blast furnace. It includes the following several portions: left and right circular side plates, fire-resisting liner, internal enclosure ring, external enclosure ring, left and right ring-shaped side plates, water inlet pipe and water outlet pipe. It is characterized by that the external enclosure plate of said valve plate adopts composite plate, said composite plate includes base material and surface material, said base material is made of low-carbon steel and the surface material is made of austenitic stainless steel. Said invention also provides the connection mode of all the above-mentioned portions and their concrete structure.

Description

technical field [0001] The invention relates to a hot blast valve used in blast furnace ironmaking equipment, in particular to a hot blast valve plate. Background technique [0002] The hot blast valve is installed on the hot blast branch pipe of the hot blast stove system of the blast furnace, and is a switching device for controlling the opening and closing of the pipeline during the combustion period and the blast period of the blast furnace. During the air supply period of the hot blast stove, the hot blast valve is opened, and all the hot air (0.3-0.5MPa) is sent to the blast furnace through the hot blast valve; during the combustion period of the hot blast stove, the hot blast valve is closed. Huge heat load on one side. In the late 1970s, in order to meet the requirements of high wind temperature, the method of ramming the refractory lining on the concave parts on both sides of the valve plate was adopted to improve the service life of the valve plate, but it still c...

AI Technical Summary

Problems solved by technology

In the late 1970s, in order to meet the requirements of high wind temperature, the method of ramming the refractory lining on the recessed parts on both sides of the valve plate was adopted to improve the service life of the valve plate, but it still could not solve the problem of oxidation and decarburization of the outer ring.

The disclosed invention patent hot air valve high temperature resistant multi-element co-infiltration technology (publication number: CN1193664A) is to add chemical heat treatment process in the hot air valve manufacturing process. Although the high temperature oxidation resistance of the outer ring is improved, the process is complicated and the cost is relatively high. high, its application is limited

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