Patent EA-005258-B1 (EA)
Title: Method for steam warming-up of hardened viscous material in tank with subsequent unloading and device for its warming-up
IPC: B65G69/20
Filed: 2003-03-18
Abstract: 1. A method for warming-up with steam of hardened viscous material, mainly oil and mineral oil products, with subsequent tank unloading from it, using a submersible heater having an independent duct for steam submission, said warming-up being carried out in two stages, at the first stage the material is preheated to obtain an upper thinned layer and to start unloading at this stage until reaching critical level of the material residue and at the second stage the material is finally heated to a temperature providing its complete drain, wherein using two independent ducts for steam submission to the submersible heater, at the first heating stage a vertical column of hardened material is heated above the tank drainage port using the second independent duct for steam submission via downward-directed nozzles and lowering the submersible heater towards the tank bottom, the second independent duct for steam submission is closed after heating the tank drainage port and heating is continued using the first independent duct for steam submission via horizontally and symmetrically arranged nozzles, both heating stages are divided by a technological pause during which heat is not provided to the submersible heater and draining at the obtained temperature reached at the first heating stage is continued until reaching critical level of the material residue after which the technological pause is stopped and the second heating stage is started. 2. The method of claim 1, wherein before said warming-up actual temperature of the hardened material having been measured, at the first stage of warming-up provides temperature gain of hardened material, duration of said technological pause being determined depending on results of measurement of variable depth of a mirror of a bath of rests of loaded material, and also from results of measurement of variable height of nozzles arrangement of said submersible heater concerning said mirror of a bath of residuals of loaded material, said technological pause being broken in steam submission at negative result of values. 3. The method of claim 2, wherein at the first stage of said warming-up said gain of temperature of the oil being provided, determined by the formula: DeltaTheta= (Thard-Tfact)-TK where: DeltaTheta-gain of temperature of oil at the first stage of warming-up, degree C, Thard-temperature of hardening of the oil, specified in accompanying cargodocuments, degree C, Tfact-actual temperature of oil in the tank liable to warming-up, degree C, TK-the correction temperature factor determined by practical consideration, wherein duration of said first stage of said warming-up being determined by the formula: tau1=(MxCpxDeltaTheta)/(cpxqn), where: tau1-duration of the first stage of warming-up, hours, M-weight of warmed up oil in the tank, kg, Cp-specific thermal capacity of oil, kcal/(kgx degree C), Cp-thermal capacity of saturated vapor at working pressure, kcal/kg, Qn-specific losses of saturated vapor on nozzles of submersible heater, kg/hour. 4. The method of claim 3, wherein value of the correction temperature factor determined by practical consideration, being to satisfy to condition TK >= 5 degree C. 5. The method of claim 1, wherein discharge of oil or viscous mineral oil products is carried out with the help of compulsory system of pumping out. 6. The method of claim 1, wherein during a technological pause the height of submerged heater is set at 600-800 mm relative to the tank bottom. 7. The method of claim 1, wherein the height of submerged heater at the second stage of warming-up is reduced to a zero value. 8. The method of claim 1, wherein superheated steam is used as a heat carrier. 9. A device for warming-up a viscous material in the tank, mainly oil and mineral oil products, comprising the first independent duct for submission of heat-carrier, pneumatically connected with jet devices directed in parallel to a mirror of said material in the tank and executed as hollow vertical bar, the second independent duct for submission of the heat-carrier, located in parallel to said first independent duct and near to it and pneumatically connected with face nozzles directed to a bottom of the tank, and jet devices of the first independent duct are replaceable and comprise face nozzles. 10. The device of claim 9, wherein at end face of said second independent duct in said heat-carrier distributive head even quantity of face nozzles directed to a bottom of said tank being placed in a vertical plane and having common basis. 11. The device of claim 10, wherein the axes of said face nozzles forming among themselves an obtuse angle. 12. The device of claim 11, wherein the angle size between axes of said face nozzles of said second independent duct for submission of the heat-carrier being within the limits of 135-170 degree . 13. The device of claim 9, wherein the axes of said jet devices being placed in a horizontal plane at opposite sides of said heat-carrier distributive head formed among themselves a sharp angle. 14. The device of claim 13, wherein the angle size between axes of said jet devices placed in a horizontal plane at opposite sides of said heat-carrier distributive head, being within the limits of 25-50 degree . 15. The device of claim 9, wherein comprises ball cocks as a means for overlapping of the heat-carrier submission arranged in the upper portion of each independent duct for submission of heat-carrier.