CC BY
15
№3, 2002г.
97
УДК 621.181
THE CONSERVATION OF THERMAL NETWORKS
A.A. Glazirin, M.T. Sysdykov
PSU named after S. Toraygyrov
Жазуда жазгы ксздегi жылу торабыныц консервциясыныц технологиясы цараст ырылды
В статье рассмотрена технология консервации тепловых сетей в летний период.
In the article there is an idea of know- how ofpreservation of thermal networks in years period is reviewed.
In summer period warmer networks of enterprises, the heating of cities blocks, the centra] heating of settlement don't work, are in reserve filling by water or if necessary of outflow the part of tubes can be in a sem¡submerged condition in atmosphere of high realization of repair works - empty. If the networks remain with water, because of relative humidity. The metal of tubes in this case is subjected of intensive corrosion. Slime and the solid corrosion products which are generatrix on a surface of metals during activity, have rather small-sized pores, and at a drainage of water it in them lingers over. In outcome at idle time the metal appears by wetted at the expense of a capillary condensation in depositions
at damp below than dew point. In such conditions also processes of corrosion rather fast develop, as the water filling in a pores, is an electrolyte. In this connection all thermal networks not working in summer period are necessary for depreserving. Now conservation of thermal networks of a part of habitation quarters Pavlodar carry out by solution of silicate of natrium. The silicates of natrium and potassium are received at fusion of silicon dioxide with diabrotic alcali:
SiO; + 2NaOH = > Na, SiO + H20
Due to a having paid likeness with glass and high dissolubility in water of
НАУКА И ТЕХНИКА КАЗАХСТАНА
silicate of natrium and potassium have received titles dissoluble or water glass. The silicate of natrium is most applicable for the purposes of conservation. In an industry silicate of natrium receive by fusion of sand with soda salt or with a mix of sulphate and coal.The aqueous solutions of silicates of alcali metals have alcali reacting owing to a hydrolysis. Silicate of natrium well we shall dissolve in water, is indissoluble in solutions of salts of natrium, in alcohol. It is dense solution yellow or is grey of colour, without mechanical actuations seen by a unaided eye.
At presence in water of ferric oxides and contact of solution with surface of metal the shielding protective layer ferrosilicate as connection Fe0*FeSi02 will be derivated. At presence in water of calcium the protective layer including calcium, silicate of natrium and iron will
be derivated.
The laboratory activities with samples and experience of conservation of thermal networks of habitation quarters of Pavlodar have shown a capability of cooking of preserving solution on the water which has stayed in thermal networks. At circulation of solution contoured part of ferric oxides is spent for formation ferrosilicate of a film on internal surfaces of tubes, and their excess remains as a deposit on a surface ferrosilicate of a film and at water washing out in a start-up phase easily leaves. Preservation carry out at concentration SiO within the limits of 1,5-3 g/l or 4,5-9 kg/m ?of the technical product. At presence incoming water of chlorides and sulphates is received greater of indicated values.
At conservation of habitation quarters install a mobile caravan, introduced on thescheme.
2
„ 1
Scheme of a mobile caravan for line of reset of water in a tank; 4 - flexible
conservation of quarter thermal networks: pipe; 5 - straight line the pipe line of water
1 - Tank for circulation of solution delivery per habitation quarter;6-figurative
contoured; 2 - supply of concentrated pipe line of water delivery per habitation
technical silicate of natrium; 3 - fixed pipe quarter; 7 - again established fixed union;
№3, 2002r.
99
8 - nominal reinforcement; 9 - pump of a type 2K-6 or 3K-6 for circulation of preserving solution contoured.
On a movable dolly install a tank by 1 capacity 1-1,5 m? and pump 9 with supply to approximately equal water volume preserved by thermal networks.On a tank the pipe line 3 for connection of a flexible pipe 4 is installed. On direct and converse pipe lines thermal networks also install of the fixed pipe connection with valves for affixture of a flexible pipe. After opening-up of the scheme of recirculation in a tank 1 dose computational quantity of silicate of natrium. The control behind its concentration conduct on samples taken on reset 3. At circulation of preserving solution, but not earlier than through 2 hours after the moment of input of a reactant, with the purpose of intensification of stirring of silicate of
natrium on all sites solution pumping on separate sites with cut-out adjacent.
In connection with considerable ramifide of a preserved contour the duration of circulation should be not less than 12-16 hours. The preserving solution remains in pipe lines before launch of a network in activity. If it is required to lay up completely thermal networks and boiler-house working for these networks, after the ending of heating season and the decrease of temperature of water in thermal networks are lower 60?C actuate pumps of water circulation, and from nourishing of a tank in pipe lines of a network dose computational quantity of a strong solution of silicate of natrium. Circulation of solution execute not less than 1 day. Before launch in activity preserving solution from thermal networks drain. Padding washing out of pipe lines it is not required.
LIST OF THE LITERATURE
1. Glazyrin A.I.. Muzyka L.P., protection of metal of the heat power Kabdualieva M.M. Corrosion and equipment. M.
preservation(conservation) energetic of 3. Tomashov N.D. The theory of
the equipment. corrosion and protection of metals. M.;
2.Akolzin P.A. Corrosion and publishing house AH.
