Central air conditioning system of water treatment technology - others Manufacturer
Abstract In this paper, Central air conditioning Water Treatment System, about the use of appropriate water treatment technologies to achieve the purpose of improving the efficiency of its cooling, its method is simple, high efficiency, very high practical value.
Introduction Central air-conditioning water system is divided into three parts: the cooling section, chilled water air-conditioning parts and heat exchanger part of the condensate, corresponding to the water system for circulating cooling water system, chilled water - heating water system, then the water tray. Central air-conditioning systems have three parts water system characteristics, but the same problems: the water quality in nature mostly as dissolved salts in the water most of the water quality and more performance for the unstable state. Changes in external conditions (temperature, velocity), scaling occurs, corrosion and biological fouling and other phenomena, such as appropriate water treatment is not bound to give rise to
Pipeline Blocking, corrosion leakage, reducing the efficiency of a series of problems affecting the entire central air conditioning systems work properly.
1 purpose of central air conditioning water The purpose of central air conditioning water roughly divided into three parts. 1.1 to extend the service life of pipelines and equipment The effect of treatment is to achieve the design of pipelines and equipment life, in Table 1.
1.2 Water Energy Generated when the rust scale and corrosion deposits would result in decreased air-conditioning system cooling efficiency, in order to achieve the same cooling efficiency, we must increase the energy consumption at the same time has security implications. For proper water treatment, central air conditioning system to prevent scaling, corrosion, disinfection of equipment can also be effective, economical, safe operation. Save a lot of energy, as well as a large number of industrial water conservation.
1.3 to improve Fans Coil system operating conditions to create a stable and comfortable working and living environment, central air conditioning system to ensure the normal operation to stabilize the economy.
2 central air conditioning water treatment methods and practice Water treatment method according to water conditions, differences in equipment requirements differ, the following some of the current water treatment methods commonly used to do 11 Introduction.
2.1 pH value adjustment method Under Langgelier index, calculated saturation index of zero LSI pH, reached the theoretical value, in theory, water is neither scale nor corrosion, by adding
Sulfuric acid Or hydrochloric acid to the theoretical value unchanged, but due to water conditions and the daily changes in working conditions, in practice too hard, and basically does not use.
2.2 demineralized water treatment In the north, due to high water hardness, in the past the most common is to scale of ions in water such as Ca, Mg removed by replacement. But in fact, brought more serious corrosion, corrosion perforation, leakage often occurs. Because removal of calcium and magnesium ions, breaking the ion balance, the change from Langgelier index, known as the tendency to be more severe corrosion increased the following reaction, over time, there is an accelerated corrosion process, its reaction from the catalytic reaction.
Fe + O 2 + H 2 O Fe 2 + , Fe 2 + + O 2 Fe 3 + , Fe 3 + + Fe Fe 2 + Therefore, in the circulating water system, as little as possible to use demineralized water and deionized water, if the raw water hardness is too high, specialists in water treatment under the guidance of water quality for water distribution. Now, Europe and the United States and other countries have come to abolish the soft water of the device, because the sewage will bring even more serious environmental pollution.
2.3 electronic, static electric field Use of an external electric field, so that the water anions and cations in the electric field, rendering the water polarization cation of calcium and magnesium, etc., so that to make water and calcium carbonate crystal lattice distortion occurs, it dispersed in water, can not form nuclei, generating precipitation. However, because of its electric field can only be effective within a certain distance, if distance changes or due to the weakening of electrostatic force, ion frequency, changing the water, often over time, will lose its inhibition effect.
2.4 Magnetization Magnetic field, so that the water magnetization and stability of various product groups at the water, but in practice, theory and practical does not match, processing capacity and electronic, electrostatic field similar to the specific practical effect to be proven.
2.5 traditional chemical water treatment Chemical treatment by adding a variety of water quality stabilizer, such as corrosion and scale inhibitors, dispersants, fungicides, so the water scaling of ion stability in the water, its principle is through chelation, complexation, and adsorption dispersion, so that calcium and magnesium chelate complex by stable soluble in water, and iron oxide, silica and other colloidal dispersion good. As the corrosion inhibitor on metal surface to form insoluble in water or insoluble in water, protective film, by preventing hydration of metal ions or dissolved oxygen, and inhibit the corrosion reaction. The role of specific chemical scale and corrosion inhibition are described below, this method is the use of central air-conditioning the most common water treatment method is also applied in industrial water treatment broadest and most technologically sophisticated methods, practice proved to be a effective and economical method.
3 features central air conditioning system 3.1 Characteristics of circulating cooling water system Central air conditioning cooling water system of concentration and the relationship between running time, as shown in Figure 1, operating conditions in Table 2.
Figure 1 and Table 2 can be seen, A curve representative of a small cooling tower, B, C curves representative of medium-sized cooling towers, if the taking of sewage, A, B system in a few within 10 hours of concentration will reach more than 10 times, C curve is forced sewage accounted for 0.35% of circulating water, concentration is 3. Relative to the DC cooling water, the concentration ratio at 2.5, 98.6% of water conservation, concentration multiple of 3, the conservation of water, 98.8%, concentration of 4, the conservation of water, 98.9%, so the daily-treatment Time is no need to deliberately run in the high concentration index, but sometimes inappropriate in the case of control will lead to failure, it is generally concentrated around the appropriate multiple of 3.
Circulating cooling water system decide that the need to address three issues: scaling, corrosion and algae growth of bacteria.
3.2 features chilled water system
1) chilled water system is normally closed circulatory system, there is no evaporation, the water will not damage the basic, but it is worth to note that, with a spray device chilled water system, a special moisture in summer, ie the In the cycle of
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