Deaerator

I. Overview:

The presence of dissolved oxygen in water is the main cause of corrosion in boilers, heat exchangers and heat network pipelines. This corrosion causes serious waste of energy and capital, and at the same time buryes hidden dangers for the safe operation of equipment. To this end, the national "Low Pressure Boiler Water Quality Standards" (GB 1576-2001) put forward clear requirements for the fitting of boiler feed water deaerator. In addition, the oxygen corrosion of equipment and pipelines in the heat exchanger network of chemical and fertilizer industries is also caused by the high dissolved oxygen content in the water. Such corrosion has plagued technicians in various industries for many years, seriously affecting the improvement of energy-saving technologies. The deoxygenation of industrial water is increasingly valued. At the same time, due to the fact that traditional deaerator equipment has its own shortcomings in operation, it can not adapt to the demand in many cases, or it consumes too much energy or has a great impact on water quality. Therefore, the development of deaeration technology has received increasing attention.

Analytical deoxygenation is a method of removing dissolved oxygen from water using the principle of physical-chemical combination.

Second, the working principle:

    Analytical deoxygenation is based on Henry's law. The oxygen-free gas is strongly mixed with the oxygen-containing water to precipitate the oxygen dissolved in the water to the gas, so that the feed water meets the water quality requirements. The oxygen-containing gas is recycled into an oxygen-free inert gas in a heated reactor for recycling. According to Henry's law, the solubility [C] of a component in a mixed gas in a liquid is proportional to the equilibrium partial pressure [P] of the gas at the gas-liquid interface, namely: C=K•P.

Third, the workflow:

The water to be treated is sent to the ejector by the deaerator pump, and when the water passes through the ejector at a certain flow rate, a certain negative pressure is formed to draw in the oxygen-free gas. The water and oxygen-free gas are thoroughly mixed in the mixing tube and then passed to the resolver where the dissolved oxygen in the water diffuses into the oxygen-free gas in the analytical system. The oxygen-laden gas enters the gas-water separator from the top of the resolver, dehydrates by the gas-water separator, enters the heat exchanger and rises to about 60-80 °C, enters the heater, and then enters the reactor to react with the reducing agent in the reactor. Re-established as an oxygen-free gas, and then enter the next cycle, in order to achieve the purpose of continuous operation of oxygen removal.

  Installation Precautions 

1. The equipment only needs a single foundation. It is recommended to pre-embed the steel plate at the bottom of the desorber and weld it on site during installation; the bottom of the reactor only needs to be horizontal;

2, the equipment is not less than 30cm from the wall, the relative position of the equipment can be changed according to the specific circumstances;

3. Place the power distribution cabinet on the wall near the equipment. The power varies depending on the model of the equipment;

4. According to the process, the equipment should be placed according to the site conditions. It should be noted that the top of the desorber is higher than the highest water level of the water tank by more than 2 meters;

5. It is recommended that the deaerator pump head be 45~50 meters; the deaerator pump flow should be 1.25~1.5 times of the output of the equipment.

6. Connect the equipment according to the process. The interface is preferably welded except for the specific instructions; the equipment and each pipeline should be free of leakage;

7. Under the premise of ensuring the reasonable process, the equipment can be flexibly arranged, and it is recommended to arrange it by wall or corner;

8. When the equipment is difficult to arrange, the ejector and desorber gas-water separator can be arranged separately from the heat exchanger, the heating reactor and the electric control cabinet (if placed indoors and outdoors, placed on different floors, etc.);