Improved Blast Furnace Soft Water Closed Circulation System and Method

Abstract

The invention discloses an improved blast furnace soft water closed circulation system and method. The system comprises a host controller, a cooling wall cooling unit, an expansion and degasification unit, a secondary circulation water unit and a primary circulation water supply unit. According to the improved blast furnace soft water closed circulation system and method, multiple water supply main pipes are adopted, the redundancy degree of the system is increased, and blast furnace production safety is guaranteed; a cooling wall is zoned, grading and leakage detecting are facilitated, the time needed for leakage detecting is reduced, and guarantees are provided for stable production and cost reduction; and secondary circulation water setting is reasonable, the work pressure of secondary circulation water cooling equipment is reduced, the risk of water leakage is reduced, and the gas contents in primary circulation water and secondary circulation water are reduced.

Description

technical field The invention relates to the technical field of molten steel smelting equipment, in particular to an improved airtight circulation system for soft water in a blast furnace, and also to a method. Background technique The blast furnace cooling system mainly includes two types: the industrial water open circuit cooling system and the soft water closed circulation cooling system. The soft water closed circulation cooling system has the following main advantages over the industrial water open circuit cooling system: the cooling pipe is not easy to scale, the water is underheated (less circulating water can be used), the loss of water is small, the potential energy of the water level can be used, and the oxygen content in the water is low. It is a system that is more energy-efficient, saves investment and operating costs. After 2005, newly-built domestic blast furnaces basically adopt soft water closed circulation cooling system. After more than ten years of large...

AI Technical Summary

Problems solved by technology

1) The existing soft water closed cycle cooling system uses a single main water supply pipe for water supply. Due to the continuous cooling requirements of the blast furnace, in addition to the overhaul time, there is no time for maintenance and replacement of the valves and testing equipment on the main water supply pipe, which increases the The working time of valves and testing equipment increases fatigue and poses potential safety hazards;

2) The secondary circulation of the existing soft water closed circulation cooling system is located between the return water branch pipe and the degassing tank. The secondary circulation cooling equipment bears additional system static pressure, which is easy to cause water leakage, and the secondary circulation cooling has not been degassed. Gas disposal increases the risk of local overheating of the secondary circulation cooling equipment, posing potential safety hazards;

3) The existing soft water closed circulation cooling system is in a closed state, and the cooling wall has a large number of water pipes. Once a leakage point occurs, it takes a long time to find and locate it. However, there is blast furnace gas around the blast furnace body, so it is not allowed to search and locate cooling wall leakage for a long time dot homework

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