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The common problems in the formula operation of the spiral plate heat exchanger

[Abstract]:

Constant spiral plate heat exchanger are given in numerical model selection in the formula, the outer surface of the tube fouling results, but this formula will have two problems: the kinematic viscosity of flue gas heat conduction coefficient in the formula, numerical Prandtl number calculation is more complex, need is not suitable to do some function and use regression formula simulation model; the model is applied to simulation training, data provided by the user is using different calculation methods, the calculation of heat transfer formula and boiler makes the literature and the actual heat exchanger calculation method is different, only through the simulation error formula of adjustment coefficient of dirt.

Additional heating and power plant boiler device of modern heat transfer process in the heat pipe wall suction and many packages, which are parallel to the main heating surface heat absorption, this is because the single-phase heat exchanger main additional heating surface of the heating surface. These additional heating surface of the main heating surface of the modified specific heat coefficient correction method is the anti thermal resistance of heat transfer coefficient L with pipe wall in the formula in the denominator. For simple calculation, heat transfer coefficient of the tube wall is constant.

The problem of heat transfer temperature difference of spiral plate heat exchanger is due to the difference of heat transfer temperature, because the temperature at the working medium is close to the saturation temperature of the heating surface close to the drum pressure, and the average temperature of the heat transfer temperature difference between the flue gas and the pressure difference of the drum pressure is adopted.

The additional heating surface area of the actual loss often. Finally calculate the additional heat transfer of the heating surface, and record the thermal recording for his use. The heat convection boiler flue pipe wall is mainly additional heating surface cooling. So when the natural convection cooling calculation formula and constant heat transfer coefficient, the saturation temperature of drum pressure and ambient temperature the heat radiating area of additional heating surface temperature difference of the temperature difference.