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Common problems in formula calculation of spiral plate heat exchanger

# Common problems in formula calculation of spiral plate heat exchanger

• Categories:Common Problem
• Author:
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• Time of issue:2018-02-05
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(Summary description)The spiral plate heat exchanger gives the constant in the selection formula in the numerical mode, and adjusts the result of the dirt thermal resistance on the outer surface of the tube, but this formula will cause two problems: the formula for the heat transfer coefficient of the flue gas involved, the kinematic viscosity, and the general The numerical calculation of the rand number is more complicated, and it is not suitable to do some functions and the simulation model calculated by the regression formula;

# Common problems in formula calculation of spiral plate heat exchanger

(Summary description)The spiral plate heat exchanger gives the constant in the selection formula in the numerical mode, and adjusts the result of the dirt thermal resistance on the outer surface of the tube, but this formula will cause two problems: the formula for the heat transfer coefficient of the flue gas involved, the kinematic viscosity, and the general The numerical calculation of the rand number is more complicated, and it is not suitable to do some functions and the simulation model calculated by the regression formula;

• Categories:Common Problem
• Author:
• Origin:
• Time of issue:2018-02-05
• Views:
Information

The spiral plate heat exchanger gives the constant in the selection formula in the numerical mode, and adjusts the result of the dirt thermal resistance on the outer surface of the tube, but this formula will cause two problems: the formula for the heat transfer coefficient of the flue gas involved, the kinematic viscosity, and the general The numerical calculation of the rand number is more complicated, and the simulation model that needs to do some functions and use the regression formula to calculate is not suitable; the model is applied to simulation training, and the data provided by the user uses different calculation methods to make literature and actual The difference between the calculation formula and the heat transfer calculation method of the boiler heat exchanger is that only the simulation error formula of the fouling coefficient is adjusted.

The additional heating and heat dissipation of the heat transfer process of modern power plant boiler devices have suction wall pipes and many packages, which are absorbed in parallel to the main heating surface of the heat. This is because the main heating surface of the additional heating surface of the single-phase medium heat exchanger. The additional heating surface adopts the modified heat transfer coefficient of the main heating surface. The specific correction method is to add the anti-heat resistance of the heat transfer coefficient of the L tube wall in the denominator of the formula. For the sake of simple calculation, the heat transfer coefficient of the tube wall is constant.

The problem of the heat transfer temperature difference of the spiral plate heat exchanger, due to the heat transfer temperature difference, due to the working medium temperature plus the heating surface close to the saturation temperature under the steam drum pressure, and the average temperature of the flue gas and the steam drum pressure saturation temperature difference heat transfer temperature difference .

The actual area of ​​the additional heating surface is constant loss. Finally, the heat absorption of the additional heating surface is calculated by the formula, and the heat record is recorded for his use. The heat dissipation of the boiler convection flue is mainly the heat dissipation of the additional heating surface of the tube wall. So when Calculate the natural convection of the cooling formula and constant heat release coefficient, use the temperature difference of the steam drum pressure and the saturation temperature under the ambient temperature, and the additional heating surface temperature difference of the heat transfer and heat dissipation area.

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