Thermal plant boiler preservation with dry air
The problem of heat and power equipment preservation is very essential as of today. There are some preservation methods. One of them is creation of protective film on inner surfaces of equipment with the help of chemical substances. But it has the following shortcomings: in due course time the film becomes thinner and thinner to total disappearance; additional safety measures are necessary (continuous monitoring of chemical substances concentration both inside of preserving circuit, and in the air, surrounding it); and there appears a problem of these chemicals disposal. Also, there is very important moment at such preservation method – the problem of the humid air ingress in case equipment repair takes place. Therefore it becomes impossible to perform repair works quickly and safe.
DT Group engineers together with engineering personnel of TPP (Thermal Power Plant) “Zmievsky” in Ukraine studied the problem and came to the conclusion, that the most technically and economically advantageous method of preservation is purging of equipment with dry air. For the boiler the system of preservation by dry air on the base of MDC5000 Customized desiccant dehumidifier was developed. The specificity of this problem was that the boiler circuit consists of kilometers of heatexchange tubes, which should be purged with dry air. For this purpose the dehumidifying system is fitted with a booster fan with delivered external static pressure up to 5 000Pa which is just enough for solving the problem. All elements are placed on convenient mobile frame with wheels, hooks, and a handle for easy moving of the unit. It is very important, because different equipment is put for preservation in any time and the unit mobility is simply the necessity.