Water circulation method and water circulation system for improving surface quality of hot-rolled strip steel

A technology of circulating water system and surface quality, applied in water/sewage treatment, chemical instruments and methods, workpiece surface treatment equipment, etc., can solve the problems of black and gray on the surface of strip steel, unable to meet production requirements, affecting product surface quality, etc. To achieve the effect of reducing suspended solids

Pending Publication Date: 2020-04-28
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it will cause black and gray problems on the surface of the strip steel, seriously affect the surface quality of the pr

Method used

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  • Water circulation method and water circulation system for improving surface quality of hot-rolled strip steel
  • Water circulation method and water circulation system for improving surface quality of hot-rolled strip steel
  • Water circulation method and water circulation system for improving surface quality of hot-rolled strip steel

Examples

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Example Embodiment

[0046] Example 1:

[0047] The embodiment of the present invention provides a water circulation method for improving the surface quality of hot-rolled steel strip. The method is implemented based on an indirect cooling circulating water system, a laminar cooling circulating water system, and a direct cooling circulating water system. The indirect cooling circulating water system, also known as the clean circulating water system (abbreviated as A system), mainly processes the cooling water of the furnace door and beam of the heating furnace, the cooling water of electrical equipment, hydraulic systems, air compressors, instruments and other equipment; laminar flow Cooling circulating water system, also known as laminar water system (abbreviated as B system), mainly deals with laminar strip top spray, bottom spray cooling and side spray water; direct cooling circulating water system, also known as turbid circulating water system (abbreviated as C system) , It mainly treats the roll...

Example Embodiment

[0080] Example 2:

[0081] Based on the same inventive concept, an embodiment of the present invention provides a water circulation system for improving the surface quality of hot-rolled steel strip, and the water circulation system is used to implement the water circulation method of the first embodiment. See Figure 4 The water circulation system includes an indirect cooling circulating water system 100, a laminar cooling circulating water system 200, a direct cooling circulating water system 300, and a controller (not shown in the figure), in which:

[0082] The indirect cooling circulating water system 100 includes a circulating pipe 14 for circulating indirect cooling circulating water to users 11 of the indirect cooling circulating water system 100, a water replenishing pipe 15 for replenishing the indirect cooling circulating water, and Sewage discharge pipeline 16 for discharging indirect cooling circulating water. Among them, the circulating pipeline 14 is provided with ...

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Abstract

The invention discloses a water circulation method and system for improving the surface quality of hot-rolled strip steel. Indirect cooling circulation water of an indirect cooling circulation water system is filtered and cooled to be recycled by a user of the indirect cooling circulation water system. Laminar flow cooling circulating water of a laminar flow cooling circulating water system is filtered and cooled to be recycled by the laminar flow cooling system. Direct cooling circulating water of a direct cooling circulating water system is filtered and cooled to be recycled by a user of thedirect cooling circulating water system; water replenishment of the direct cooling circulating water system uses drained water of the laminar cooling circulating water system and the indirect coolingcirculating water system and new water; and the direct cooling circulating water system discharges sewage. A reverse cross water supply process, namely new water-clean circulating water-turbid circulating water-laminar flow water-new water, is adopted, so that the comprehensive concentration multiple of the clean circulating water and the turbid circulating water can be more than 3, the laminar flow water quality requirement can be met, and hot rolled strip steel meeting different user requirements can be produced under the existing descaling condition.

Description

technical field [0001] The application belongs to the technical field of hot-rolled strip steel production, and in particular relates to a water circulation method and a water circulation system for improving the surface quality of hot-rolled strip steel. Background technique [0002] Surface quality is one of the main quality indicators of hot-rolled strip steel. When the adhesion between the oxide scale on the surface of the hot-rolled strip steel and the substrate is not good, it is easy to fall off in powder form during the process of Kaiping and processing, and black ash is generated. Scale, red rust, intrusion of foreign matter, and scratches are typical surface quality defects of hot-rolled strip steel. In particular, during the rolling process of hot-rolled steel sheets, a layer of iron oxide scale will be formed on the surface of the steel sheet, which is difficult to remove, resulting in problems such as red rust, iron sheet pressing, and pickling residues on the ...

Claims

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Application Information

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IPC IPC(8): C02F9/10B21B45/02B21B45/08C02F103/16
CPCB21B45/0218B21B45/08C02F1/00C02F1/001C02F1/38C02F1/40C02F1/5236C02F1/56C02F2103/16
Inventor 吕中付张垒王丽娜林俊张德胜徐峰武
Owner 武汉钢铁有限公司
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