RU2012152487A - METHOD FOR HEAT TIGHTNESS CONTROL OF A LARGE-SIZED VESSEL - Google Patents

Abstract

The method of thermal control of the tightness of large vessels, for example, a boiler of a railway tank, including loading the vessel with the internal pressure of the working fluid, recording and analyzing the temperature field of the vessel, characterized in that the control is supplemented by the continuous supply of water vapor (working fluid) into the vessel, and the internal pressure levels are kept constant and the temperature of the working fluid, scan the surface of the vessel with registration of temperature contrast by a heat-sensitive device, the axis of sight the latter is set obliquely to the surface to be monitored and the values of changes in the measured temperature of the surface to be monitored ΔТ are compared with the calculated value of the temperature change depending on the established acceptable leak size S according to the formula: where ΔТ is the calculated value of the temperature difference between the working fluid and the vessel; T is the temperature on the surface of the vessel, K; T is the temperature of the working fluid inside the vessel, K; P, P is the pressure of the environment and the working fluid in the vessel, respectively, MPa; S is the leakage area, m; η is the viscosity of the working fluid, Pa · s; l is the vessel wall thickness, m; φ is the coefficient of the expiration of the working fluid; µ is the molar mass of the working fluid,; C is the molar heat capacity of the working fluid at constant pressure, and when the calculated temperature is exceeded, the measured ones judge the presence of defect and its location on the control surface.

Claims (1)

The method of thermal control of the tightness of large vessels, for example, a boiler of a railway tank, including loading the vessel with the internal pressure of the working fluid, recording and analyzing the temperature field of the vessel, characterized in that the control is supplemented by the continuous supply of water vapor (working fluid) into the vessel, and the internal pressure levels are kept constant and the temperature of the working fluid, scan the surface of the vessel with registration of temperature contrast by a heat-sensitive device, the axis of sight Ia last set obliquely to the test surface and changes the measured value is compared controlled surface temperature? T _and the calculated value of the temperature change depending on the set allowable leak size S _mp using the formula: $$\Delta T_R=T_{R.t.}-T_{n.P.}={\left[\frac{(R_2-R_{\mathrm{one}})\cdot S_{tR}\cdot \varphi }{\mathrm{four}\cdot \pi \cdot \eta \cdot l}\right]}^2\cdot \frac{{\mu }_{R.t.}}{2\cdot {\mathrm{FROM}}_R}$$

, where ΔТ _p is the calculated value of the temperature difference of the working fluid and the vessel; T _n.p. - temperature on the surface of the vessel, K; T _rt - temperature of the working fluid inside the vessel, K; P ₁ , P ₂ - the pressure of the environment and the working fluid in the vessel, respectively, MPa; S _Tr - leak area, m ² ; η is the viscosity of the working fluid, Pa · s; l is the vessel wall thickness, m; φ is the coefficient of the velocity of the expiration of the working fluid; µ _r.t. - molar mass of the working fluid, $$\frac{\mathrm{to}g}{m\mathrm{about}lb}$$

; With _p is the molar heat capacity of the working fluid at constant pressure, $$\frac{D\mathrm{well}}{m\mathrm{about}lb\cdot \mathrm{TO}}$$

, and when the calculated temperature is exceeded, the measured ones judge the presence of a through defect and its location on the control surface.