SU1703213A1 - Apparatus for water cooling of rolled stock and rolling equipment - Google Patents

Abstract

The invention relates to the circulating water supply of the rolling mill and can be used in the metallurgical and machine-building industries in hot sheet rolling shops. The purpose of the invention is to increase cleaning efficiency and reduce capital and operating costs. The cooling of the rolling stock and the equipment of the mill consisting of the rough and finishing stands and the outlet roller table having sub-channels, and the last section also contains a sump and a pump, is provided with a circulating water supply cycle. The water supply system includes purified water tanks, a block of facilities for deep cleaning, cooling towers and pipelines connecting them. Substrate channels for roughing and finishing stands are also equipped with sumps and pumps, which turns them into independent sections. In addition, the water supply system includes a distribution chamber. The reservoirs of the purified water of the areas of the roughing stands and the outlet roller table are included in the cooling system through a distribution channel, and the reservoir of the section of the finishing stands is connected to this system through a block of deep cleaning facilities and a distribution chamber. This allows separate collection and efficient transportation of wastewater from these sites and their treatment. 1 sludge C i o CJ ND CJ

Description

The invention relates to the field of circulating water supply for rolling production and can be used in the metallurgical and engineering industries, mainly in the hot rolling shops of the sheet.

The purpose of the invention is to increase cleaning efficiency and reduce capital and operating costs.

The drawing is a diagram of the proposed device.

The device consists of a reverse cycle of water supply of polluted water to supply equipment cooling systems.

on the section of roughing stands (section A), including rollers 1 of the roller table, rolls of rough stands 2 and others (not shown), equipment cooling and rolling on the section of finishing stands 3 (section B), including rollers 1 of the roller table, rolls finishing stands 3, rolling stock 4 and others (not shown), equipment cooling and rolling in the section of the outlet roller table (section B), including the rollers I of the roller table, winders 5, lanes 6.

Cooling subsystems are located trays: tray 7 - on section L, tray 8 - on section B, tray 9 - on section

at.

Outputs 10 and 11 of trays 7 and 8 are equipped with primary clarifiers 12 and 13. The reservoir 11 of purified water at the primary clarifier 12 is connected by a pipeline 15, equipped with pumps located in a pumping station 16, and a distribution chamber 17, to the cooling systems of the steel and equipment.

The tank 18 of purified water at the primary clarifier 13 is connected by a pipeline 19, equipped with pumps located in a pump station 20, a block 21 of facilities for deep water purification, cooling towers 22, a pump station 23, a distribution chamber 17, with cooling systems for rolled products and equipment.

The treated water tank 24 at the primary clarifier 25 is connected by a pipeline 26, equipped with pumps located in a pumping station 27, and a distribution chamber 17, to the rolling cooling system and equipment 29. The primary clarifier 25 is located at the outlet 28 of the swap tray 9.

The deep water treatment unit 21 includes sewage treatment plants 30, which use the method of gravity settling, for example radial septic tanks with an integrated flocculation chamber and a rotating scraper truss. It is possible to use other similar structures, such as modernized highly efficient horizontal secondary clarifiers, open hydrocyclones, and flocculators.

The building block 21 includes filters 3 with a water treatment furnace, for example, with an anthra-cytoquartz loading. It is possible to use filters with a three-layer load, peiomol styrene and fiber loads.

The unit 21 for deep cleaning facilities under certain conditions may include fine filters without a sewage treatment plant.

The device works as follows.

Purified and cooled by the pump station 23 through the distribution chamber 17 is supplied to the mill cooling systems 29. The waste water collected by tray 7 at section A from rough stands 2, rollers 1 of the roller table and others is discharged through outlet 10 of tray 7 about the primary sedimentation tank 12. The residence time of the water in the septic tank 12 is selected based on the conditions of the required water quality. In the settling basin, sedimentation of suspended substances with sizes of 40 microns and above is provided. The concentration of suspended solids and oils in the purified water depends on the consumers to whom the water will be supplied. For example, for packaged stands and rolls of roller tables and other 50-150 and 50-60 mg / l, respectively, for rolls of finishing stands, 50-100 and 50-60 mg / l, respectively.

After the sump, water enters the chamber 14 of the clarified water and then the pumps installed in the pumping station 16 are supplied via pipeline 15 to the distribution chamber 17. Chamber 17 carries out the distribution of water to the respective consumers (cooling system 29) of the mill.

The waste water collected by the chute 8 from area B from the finishing stands 3, the rollers 1 of the roller table, cooling of the roll 4 and others is discharged through the outlet 11 of the tray 8 to the primary settling tank. 13. The residence time of water in the sump is selected from the condition of the retention of individual large particles of scale, large random objects, while the size of suspended particles of scale in purified water does not exceed 40 microns.

After the sump, the water enters the chamber 18 of the clarified water and the pumps installed in the pumping station 20, through the pipeline 19 is fed from the block 21 of facilities for deep cleaning. Taking into account that the possibility of the removal of large particles of scale to these structures is practically excluded, the specific load on them can be increased or, under a constant load, the efficiency of water purification can be increased.

In the absence of large particles, lightweight conditions are created for scrapping the rotary farm of the settled scale and its subsequent pumping out of the radial clarifiers by pumps. For anthracite-quartz filters, the absence of coarse scale significantly reduces the effect of wear and tear of the load, which makes it possible to significantly prolong its service life at maximum loads.

The water clarified on the radial clarifiers 30 is cooled on the cooling towers 22. The cooled and clarified iodine after the after-treatment on the filters 31 is pumped by the pump station 23 through the distribution cluster 17 to the corresponding consumers. On filters it can be additionally cleaned both as an expense and part of the expense.

In the distribution chamber 17, the necessary redistribution of water after the sump 12 and the block 21 of the facilities take place to ensure the required water quality for all the cooling systems of the mill. Taking into account the higher quality of water supplied after the periche clarifier 12 and the building block 21, the intensity of slagging and occasional objects of nozzles and collectors of cooling systems is significantly reduced, which increases the efficiency of their work and the mill as a whole.

The waste water is collected by the tray 9 in section B from the rollers 1 of the withdrawal roller table, winders 5, cooling strip b, is discharged through the outlet 28 of tray E to the primary clarifier 25. The residence time of the water in the clarifier 25 is selected based on the condition of the required quality of flow. After the settling tank, the water enters the tank 24 of purified soda and then by pumps installed in the pumping station 27. A pipeline 26 is supplied to the distribution chamber 17. Chamber 17 carries out the distribution of the water supplied to the mill consumers.

The proposed device for water cooling of rolling stock and equipment allows, by separating tray substitutions in the roughing and finishing stands, to create conditions for separate efficient primary wastewater treatment from these sites and to obtain the best quality of cleaned ice from the roughing stands. This makes it possible to supply purified water from the area of the roughing stands to the cooling systems of the mill and thereby ensure the reliability and efficiency of their work.

Equipping the outlets of the trays in these areas with a separate primary clarifier allows, with lower capital costs for the initial cleaning, to ensure the best quality of the purified water.

The supply of water purified in the primary clarifier from the section of the finishing stands to the block of deep cleaning structures increases the efficiency of these facilities, improves the quality of the purified water returned to the workshop, and thereby increases the efficiency and reliability of the cooling systems of the mill. In addition, this reduces the capital and operating costs of a block of external structures.

Claims (1)

Apparatus of the Invention A device for water cooling of rolling stock and equipment, mainly sheet rolling shops, comprising a circulating cycle of water supply of contaminated water, comprising a cooling system for rolling stock and equipment cooling devices in the roughing and finishing stands with substitution channels and the outlet roller table with independent substitution channel , a settling tank and a pump, water purification tanks, a block of deep cleaning structures, cooling towers and pipelines connecting them. m that, in order to increase cleaning efficiency and reduce capital and operating costs, it is equipped with a distribution chamber installed in front of the rolling cooling system and equipment cooling devices, and the sub-channels of the roughing and finishing stands are additionally equipped with septic tanks and pumps and are self-contained, while The tanks of purified water in the areas of the roughing stands and the outgoing roller table are connected to the cooling system through the distribution chamber, and the tank in the section of the finishing stands is through a block of deep cleaning facilities and a distribution chamber. Editor L. Yu Tehred M. Morgenthal Proofreader M. Demchik Order 17Tirage Subscription VNIIPI TLV, Executive Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk Nab.