Model of thermal effect of fire within a dike on the oil tank

Abstract

Building a mathematical model for the heat build-up in the oil tank shell under the thermal effect of a combustible liquid pool fire within the tank dike. methodology. A thermal balance equation for an oil tank exposed to heat from the pool fire has been worked out. Both radiant and convective heat transfer processes between the pool fire and the environment have been taken into account. Estimates for the distribution of temperatures and airflow velocities in the plume above the fire have been used to account for the convection component of the heat flux from the pool fire. findings. Dynamics of the tank shell temperature change in time under the thermal effect of the pool fire within the dike has been obtained. The obtained expression is the solution of the differential equation worked out on the basis of the thermal balance analysis for the oil tank shell exposed to heat. originality. The convective component of the heat flux from the pool fire to the oil tank is taken into account and estimates of the distribution of temperatures and velocities in the plume are built. Practical value. The proposed model of the tank shell heat exposure to the pool fire within the dike could provide the basis for building a decision-making system for the fire response manager, outlining safe zones for positioning the equipment and personnel involved in fire-fighting, while developing fire pre-plans at the oil refining facilities and designing security systems for oil tanks.

Determining the source data to form a control algorithm for hydrogen generators

“…The source data that underlie the formation of algorithms for controlling the technical condition of hydrogen storage and supply systems could be based on the parameters and characteristics for both static and dynamic modes of their operation. Papers [14,15] employ the frequency characteristics in order to construct algorithms to control hydrogen generators.…”

“…Implementation of such an algorithm of control does not make it possible to receive information about the technical condition of a hydrogen generator over the entire range of working frequencies. This flaw has been overcome by the algorithm to control the technical condition of a hydrogen generator, which is described in paper [15]. The starting material for the implementation of such a control algorithm is the phase-frequency characteristic of a hydrogen generator.…”

Developing a model of tank cooling by water jets from hydraulic monitors under conditions of fire

“…In study [9], the authors constructed a model of thermal influence on a tank of a fire related to the combustible liquid spill in its banking, which also implies the need for cooling a tank. In paper [10], the model of cooling a tank with a water film flowing down its wall was constructed, provided that the transfer of heat from a fire is going exclusively through radiation.…”

“…In paper [10], the model of cooling a tank with a water film flowing down its wall was constructed, provided that the transfer of heat from a fire is going exclusively through radiation. At the same time, the contribution of a convection component to the heat flow to a tank for fires in the banking can reach 20 % [9]. All this allows us to assert that it is appropriate to carry out research dedicated to the problem of tank cooling under fire conditions.…”

“…The circuit of tank cooling by a water jet: 1 -area of responsibility on the tank wall, on which a water jet moves; 2 -water film that flows down the tank wall after jet getting at point O; 3 -trajectory of water jet motion on the tank wall Consider the elemental area on the tank wall. In the absence of cooling, its temperature is described by the differential equation [9]…”