“Zaporozhstal” Steel Works within the limits of realisation of the complex program for ecological up-grading of the blast-furnace production has chosen the company «Yerushalmi Water Cooling Towers Ltd» (Israel) as the supplier of fan water-cooling towers of the industrial water recycling, the high- efficient equipment for gas purification systems of the Blast furnaces. The total amount of investments into new equipment composed more than 23 million UAH.
Creation of closed systems of water supply in production cycle, with using of effluent sewage in systems of industrial water recycling of the production equipment of the Steel Works is the most rational way in solving the problem of water bodies protection from pollution by the industrial effluent. Construction of new industrial water recycling (cooling towers) allows to solve at a time 3 problems: to reduce fresh water intake, to stop dumping of polluting substances into water body and to return into production the valuable raw materials earlier lost with waste waters.
The industrial water recycling is already used at the Steel Works in sinter production, steel-melting and rolling production where effluent treatment is done with usage of various treatment facilities and special devices (the radial and horizontal settling tanks, open hydrocyclones and hydrocyclones – flocculators), for catching, thickening and dehydration of sludges.
Efficiency of new fan water-cooling tower means reduction of natural gas consumption during operation of the Blast furnaces on 30 % owing to reducing of top gas temperature and as result of it increasing of its calorific capacity. It will allow to save up to 1,5 million m3 of natural gas per a year.
Productivity of new equipment for gas purifications systems of the Blast furnaces of the Steel Works – fan water-cooling tower equal to 4 thousand m³ of water per hour and it insure optimum heat condition during cooling. The producers have taken into account all technical features of industrial water recycling of water supply to wet gas purifications of the Blast furnaces and have offered the most effective design of the equipment from the point of view of simplicity of service, regulation, as well as service life.
Let’s remind that at the end of October, 2014, the new pickling line (NPL-4) of hydrochloric acid pickling in the Cold Rolling Shop No.1 was put into production at the Steel Works, with unit for regeneration of used pickling fluids, which completely eliminate disposal of process waters from the Cold Rolling Mill Shop No.1 into the river Dnieper, and also reduces emissions of sulphuric acid fumes into atmosphere on 83 %.
It is necessary to notice that “Zaporozhstal” Steel Works continues realisation of the complex program of the blast-furnace production upgrading, the basic points of which are observance of strict ecological norms and in-creasing of energy efficiency. In 2014, the Blast furnace No. 4 (BF No. 4) was put into operation after reconstruc-tion with the newest aspiration systems of the casting yard and the furnace stock house. Investments composed around 600 million UAH. In the spring of 2015 the “Zaporozhstal” Steel Works has carried out the wide-ranged capital repair with elements of reconstruction of the Blast furnace No. 2 (BF No. 2) with renovation of basic parts of aspiration system equipment. Investments into reconstruction of the BF No. 2 composed around 200 million UAH. At the end of July the Steel Works has started the capital repair of the Blast furnace No. 3 (BF No. 3). The amount of means directed on repair composed 45 million UAH.