RU2001392C1 - Method of determining the tendency of ammonium nitrate to thermal decomposition exothermic reaction - Google Patents

Description

The implementation of the proposed method is carried out as follows.

Before feeding the melt of ammonium nitrate into the calorimetric tube 2, the thermostat 1 is turned on, which provides heating and a constant temperature of the medium surrounding the flow calorimetric tube to a level of 180 ° С. After that, a flow of ammonium nitrate is fed to the flow calorimetric tube 2 with a constant speed equal to 1 cm / s. Ammonium nitrate melt flow is maintained constant by the constant height of the liquid melt column in the drain tube, the lower end of which is connected to the calorimetric tube 2 and the upper end is located in the intermediate flow tank, where the ammonium nitrate melt flows from the process pipeline 7. Flow constant ammonium nitrate melt can also be carried out in any other way.

On the control unit 3, a temperature difference Dt of 45 ° C is set between the temperature meters 4 in the flow-through calorimeter tube 2 (the temperature difference sets the outcome, on the one hand, to ensure the necessary sensitivity, and on the other, so that the heat flux from the thermal decomposition reaction From. the river did not exceed the total thermal total).

After the control system reaches a steady-state value according to the meter

5, power 5 determines the electric power PI and heater 6, which is also taken as the tendency of ammonium nitrate melt to exothermic thermal decomposition reaction, since, as follows from the above, the heat flux of the exothermic reaction is determined by the rate of the reaction

0 thermal decomposition of ammonium nitrate melt.

The signal from the meter 5 is fed to the control and regulation systems, alarms and interlocks 8, thereby ensuring

5 control and safety of the ammonium nitrate production process.

The use of the method is most effective at the stages of: evaporating ammonium nitrate solutions in evaporators, before neutralizing and transferring the melt to gran-towers, where the tendency of the dehydrated melt of ammonium nitrate to a self-sustaining thermal decomposition reaction and, as a consequence, to an explosion is especially high.

(56) USSR author's certificate No. 939970, class C01 K 17/00, 1981. 0 Technologists of ammonium nitrate, ed. V.M. Olevsky, M. Khimi, 1978, p. 269-272.

Claims (1)

The claims METHOD FOR DETERMINING THE INCLINATION INCLUSION OF AMMONIA NITERIUM MELT TO EXOTHERMIC REINFORCEMENT REACTION by heating the sample and measuring the temperature in the melt, characterized in that the sample is taken at a constant speed from the process flow of the ammonium nitrate melt flow and passed through a flow calorimeter tube automatically heater, while maintaining a constant temperature difference in the stream before and after heating, but The melt to the thermal decomposition reaction is judged by the electric power in the heater. m qbtsz, / Qr.p.fzx / c 6rJ Јf- QT.P + fm COVst Concentration / CMO # "safe 0- C 0% 5. c. bt3t & C Fig.