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Aqueous solution of ammonium nitrate thermal safety Testing System

Author: ZhangXiaoJuan
Tutor: CaoXiong
School: University of North
Course: Safety Technology and Engineering
Keywords: Ammonium nitrate Thermal Safety Explosion Temperature Thermal explosion Vessel design
CLC: X932
Type: Master's thesis
Year: 2009
Downloads: 92
Quote: 0
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Abstract


Generally, the ammonium nitrate is stable and safe, but as the temperature rises and impurities in the role of the heat released by the decomposition of ammonium nitrate will thus result in burning or explosion. Against the risk of ammonium nitrate, at home and abroad have done a lot of research, and on the ammonium nitrate solution in critical detonation temperature studies have reported rarely. In this paper, thermal explosion theory to study the thermal safety aqueous solution of ammonium nitrate, ammonium nitrate solution designed a blast temperature testing devices. The specific design consists of two parts, the first part of the aqueous ammonium nitrate solution is used to test the temperature of the explosion the explosion vessel design, the second part of the test device is designed. In this study, thermal explosion theory, design container's maximum loading dose is the mass fraction of 80% ammonium nitrate solution 10ml, container volume Φ23mm × 57mm, first under conditions need to determine the shape of the container is cylindrical shell, 16MnR steel material, followed by correlation formula to calculate the incident shock wave pressure, derived container equivalent static load of 36.9 MPa, determine the design pressure of 45MPa, finalize the design of the vessel temperature was 350 ℃. On this basis, an explosion on the vessel wall thickness calculations, stress analysis, strength check and relief devices design calculation. Determined by calculation: explosion vessel wall thickness of 20mm, the flange thickness of 22mm, head thickness 26mm, the diameter of the bolt 6mm. Designed to elicit the size of the heating jacket Φ170mm × 150mm. By comparing the selected E-type thermocouple, select the model TD7-RB10 intelligent temperature controller. In addition, according to the experimental design and processing conditions of the safety box. AUTOCAD drawing with processing map. By airtight container of the explosion check to make sure that the device is good air tightness. In addition, the mass fraction of 80% ammonium nitrate solution 10ml explosive device placed in a good debugging temperature test. After several tests, the aqueous solution of the ammonium nitrate explosive temperature range of 239-241 ℃. The temperature range of the explosion and the references mentioned in 210 ~ 260 ℃ decomposition properties of ammonium nitrate is very close. The study was designed to arrive at a set of test system with good performance. In this study, design a set of test system can be used not only to heat an aqueous solution of ammonium nitrate safety studies, but also for fertilizer production safety has important practical value.

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CLC: > Environmental science, safety science > Safety Science > Safety Engineering > Explosion safety and fire and explosion
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