Research and application of energy storage dual-core stainless steel pressurized water tank-part 2

Technical innovation measures for energy quality of dual-core stainless steel pressurized water tank

The energy storage dual-core stainless steel pressurized water tank not only has the performance advantages of high-efficiency heat transfer, but also has the technical guarantee of high quality quality. There are many factors affecting the quality and quality of the heat transfer water tank, including whether there is water leakage after the water tank is used for a period of time, whether the water tank strength meets the operation requirements of high temperature and high pressure, whether the water tank is insulated and energy-saving, and whether the water tank is convenient to use. To analyze the factors affecting the quality and quality of the heat transfer water tank, the first thing that needs to be solved is the choice of making the heat transfer water tank material. At present, the heat exchange water tanks on the market are mainly divided into two types: enamel inner tank and stainless steel inner tank. The enamel inner liner is mainly composed of two kinds of materials with different expansion coefficients, such as porcelain layer and carbon steel plate. The porcelain layer is mainly used for anti-corrosion. Under the condition of water temperature of 75 ° C and relatively stable pressure, the different expansion forces of porcelain layer and steel plate are generally smaller than the adhesion between porcelain layer and steel plate, and there is no de-poration and crack phenomenon, so the use temperature does not exceed 75 ° C. The electric water heater liner is basically made of enamel liner. However, in the solar energy utilization system, due to the absorption of solar heat, the temperature of the heat exchange water tank can reach above 100 °C, and the temperature and pressure exhibit irregular pulse fluctuations, so that the expansion force of the porcelain layer and the steel plate may be greater than that between the porcelain layer and the steel plate. The adhesion, cracks will appear on the enamel surface during the alternating heat and cold process, the porcelain powder will fall off, the anti-corrosion function of the porcelain layer will be lost, and the carbon steel of the water tank substrate will corrode and leak. Moreover, the energy storage dual-nuclear heat transfer pressure tank used in the balcony wall-mounted hot water system should be uniformly sprayed to each part in a narrow space of 5 mm. The process difficulty can be imagined, and the quality of the enamel can not be guaranteed. Therefore, in the high-temperature and high-pressure unsteady working conditions of the solar water heating system, the material for the heat-exchanged pressurized water tank is recommended to be made of food grade 304 stainless steel material with certain anti-corrosion function and easy to form and weld, and the chlorine ion content in the water is high. In the area, 316L stainless steel is available. According to the design structure of the water tank, the thickness of the water tank plate is determined by selecting the strength of the material, and the structural process ensures that the plates, end covers and pipe fittings of the water tank can be automatically welded, eliminating human factors and ensuring the overall strength requirement of the water tank. The energy storage dual-core stainless steel pressurized water tank made of 304 stainless steel has no leakage and no deformation after the pressure cycle of 250,000 times between 15% and 100% of the maximum working pressure.

Secondly, the energy storage dual-core stainless steel pressurized water tank not only uses the stainless steel material that can be adapted to the application in the solar water heating system, but also uses multiple protection measures in the tank anti-corrosion technology. In the design of the water tank welding structure, the inner tank of the water tank can be welded by argon gas to prevent the material change of the stainless steel material during the welding process. In order to prevent the welding may affect the anti-corrosion function of the material, after the welding of the inner liner assembly, the energy storage dual-core stainless steel pressurized water tank must be subjected to the passivation treatment of the water tank surface through the configured metal chemical liquid under the strict technical standards. The surface of the water tank generates a very thin, dense, well-covered, chromium-rich passivation film that can be firmly attached to the metal surface. The potential of the chromium-rich passivation film can be as high as +1.0V, close to the noble metal potential; And the formation of a multi-layer CrO3 or Cr2O3 structure, the role of the metal and the corrosive medium completely separated, to prevent direct contact between the metal and the corrosive medium, so that the metal basically stops dissolving, forming a passive state to prevent corrosion. The salt spray test of the stainless steel water tank after metal passivation was 20 times higher than that of the untreated stainless steel water tank. When the blue dot method was used, no blue dot appeared for more than 35 seconds. At the same time, the energy storage dual-core stainless steel pressurized water tank also adopts the sacrificial anode cathodic protection measure. A rod-shaped magnesium rod is arranged as the anode in the water tank, and the metal tank inner tank is used as the cathode, so that the cathode and the anode pass through the conductive water medium to form. A primary battery. The anode magnesium rod of the battery is corroded and consumed by itself, while the cathode liner is protected to provide insulation and corrosion protection.

Third, energy saving, comfort, convenience and convenience are the humanized design concepts that the energy storage dual-core stainless steel pressurized water tank always adheres to. Energy storage is the most basic function of the water tank. How to prevent the water tank from absorbing the stored heat is not lost, which is an important part of the water tank. After the linear calculation of the energy-saving insulation effect of the water tank, the 80-120 liter water tank should achieve a good energy-saving effect, and the thickness of the insulation layer should be no less than 50 mm. The energy storage dual-core stainless steel pressurized water tank insulation layer is designed to be 52mm. It is made of environmentally-friendly polyurethane foaming agent and is foamed by constant temperature and constant pressure. The density reaches 36kg/m3. The inherent loss of the tested water tank is 1.2KWh for 24 hours. The water tank energy efficiency The level reaches level A. The water consumption method of the pressurized hot water tank generally adopts the cold water while using the hot water, and the treatment of the water tank structure is not good, and the phenomenon of hot and cold water mixing is easy to occur, resulting in the user's water temperature being unstable, and the water outlet rate of the water tank is extremely low. The energy storage dual-core stainless steel pressurized water tank is equipped with a cold water buffer water separator in the cold water inlet to change the direction of the cold water flow route, block the mixing of cold water and hot water, form a layer of hot and cold water in the water tank, and maximize the utilization of hot water in the water tank. In order to facilitate the installation of the water tank during construction, the energy storage dual-core stainless steel pressurized water tank is equipped with multi-functional and quick-installing components, which are designed in proportion to the modulus of the building materials, and can be quickly and perfectly installed without special tools. At the same time, the intelligent controller of the water tank can be integrated with the water tank, or it can be installed separately from the water tank according to the user's installation position. The liquid crystal display is intuitive, one-button operation, precise control, simple and convenient operation, each The protection measures are effectively integrated and safe.