Method for improving vacuum degree of condenser through using circulating water dosing treatment

Abstract

The invention discloses a method for improving the vacuum degree of a condenser through using circulating water dosing treatment. The method is characterized in that a scale and corrosion inhibitor, sulfuric acid and a sterilization and alga elimination remover are added to circulating water, wherein the scale and corrosion inhibitor comprises, by weight, 1-3 parts of organic phosphonic acid, 15-20 parts of hydrolyzed polymaleic anhydride, 3-6 parts of sodium polyacrylate and 15-30 parts of benzotriazole; the sterilization and alga elimination remover comprises, by weight, 2-6 parts of isothiazolinone, 10-20 parts of dodecylbenzylammonium chloride and 3-6 parts of dichloroethyl ether; and 1-10 parts by weight of the scale and corrosion inhibitor, 2-5 parts by weight of the sterilization and alga elimination remover and 0.01-0.1 part by weight of concentrated sulfuric acid are added to every 1000 parts by weight of the circulating water. The concentrated sulfuric acid is a sulfuric acid solution with the mass fraction being greater than or equal to 70%. The circulating water is dosed in order to improve the cleanliness of a copper tube, improve the heat transfer of the condenser and reduce the terminal temperature difference of the condenser.

Description

technical field [0001] The invention specifically relates to a method for improving the vacuum of a condenser by using circulating water to add medicine. Background technique [0002] Due to the poor quality of circulating water, the suspended matter, organic matter, microorganisms and calcium and magnesium salts in it will block or deposit in the copper pipe, making it dirty, resulting in deterioration, vacuum drop, and affecting the economy and output of the unit. When the inlet temperature and flow rate of the circulating water remain unchanged, the end difference of the condenser (the end difference of the condenser refers to the difference between the saturation temperature corresponding to the exhaust pressure and the outlet temperature of the circulating water) becomes larger, and the The temperature of the exhaust steam increases, and the vacuum of the condenser decreases. The vacuum drop reduces the volumetric flow rate of the exhaust steam, and generates a large e...

AI Technical Summary

Problems solved by technology

The vacuum drop reduces the volumetric flow rate of the exhaust steam, and generates a large exciting force on a certain part of the final blade, which may damage the blade and cause an accident.

The operating vacuum of the unit is relatively low, and the supercooling degree of the condensed water is relatively large, resulting in a decrease in the effective use enthalpy of the unit, an increase in heat loss, which is uneconomical, and at the same time the output of the unit is reduced; The pipe is loose and the tightness is damaged; the exhaust temperature rises, which causes the exhaust cylinder and the bearing seat to expand due to heat, causing the center to change and generate vibration; the axial displacement of the steam turbine increases, causing the thrust bearing to be overloaded and worn; the smaller the end difference, the cooling water The more heat absorbed, the better the heat transfer of the copper tube. If the end difference value is too much higher than the end difference index value, it indicates that the copper tube on the cooling surface of the condenser is dirty, resulting in deterioration of the heat conduction condition.

During operation, if the circulating water pump fails to stop working or the copper pipe in the condenser is blocked, etc., the exhaust steam of the steam turbine will not be able to condense, causing the pressure of the condenser to rise sharply and seriously affecting the safety of the condenser and steam turbine.

Because the pressure is too high, it will not only cause the shell to burst and the end of the copper pipe to loosen and cause water leakage, but also to raise the center of the rear part of the steam turbine rotor, causing vibration

[0003] Although in the prior art there is a method of adding corrosion and scale inhibitors and bactericides to the water to slow down the clogging of copper pipes, the effect of this method is not obvious, and the copper pipes are still prone to dirt and even clogging

[0004] In summary, in the prior art, due to the presence of suspended solids, organic matter, microorganisms, calcium and magnesium in the circulating water, the copper tubes of the condenser are likely to be dirty or even blocked, which seriously affects the operation safety of the condenser and steam turbine. lack of effective solutions