The multi-smoke vertical furnace type is essentially a volumetric heat exchanger, and its structure is the same as that of an ordinary hot water boiler. It was improved into a multi-smoke tube in the 1940s, which increased the heat exchange area and the thermal efficiency could exceed 90. A strong smoke exhauster was used. , The use of smoke-folding pieces allows the flow rate of hot smoke to increase in the smoke pipe, and the flow direction of the smoke forms a large angle with the inner wall.
The flue pipe of this kind of heat exchanger is upright, coupled with the strong extraction of the fan, the hot flue gas has a high flow rate in the flue pipe, and there is no dead corner and no dust and dirt will be deposited. All the heated surfaces are in contact with water, and the heat exchange surface directly in contact with the high-temperature flame is not severely heated, and the use of copper materials does not need to be protected (deoxidized pure copper must be used). Therefore, it is not easy to produce and deposit smoke and dust on the heated surface. After long-term use, the thermal efficiency hardly decreases. Due to the large capacity of the volumetric heat exchanger, there will be no back-boiling phenomenon, and under the condition of overheating protection, it will not scale for a long time.
For example, fin-tube heat exchangers can only be used in water heaters with gas-fired fin-tube heat exchangers and water-gas linkage control systems. The combustion method, control method, and heat exchange Any reform of the method will affect each other. If there is no enhanced burner of half atmosphere and half blast, it is difficult for volumetric heat exchangers to be miniaturized and used on wall-hung boilers. According to the water quality, Qidong Huxing Central Air Conditioning Cleaning Co., Ltd. has screened out the formula of organic compound water treatment chemicals through experiments.
 The formula has the dual effects of corrosion inhibitor and scale inhibitor, high temperature resistance, resistance to hydrolysis, etc. It is also very convenient to use. The acrylic acid and propylene vinegar copolymer in the formula is a dispersive scale inhibitor, which can surround the colloidal particles in the water to achieve the purpose of dispersing and inhibiting scale. Organophosphorus salts are chelating scale inhibitors. Because the molecules contain meridian and phosphoric acid groups, they can form stable complexes with calcium and magnesium ions in the water to achieve the purpose of chelating and inhibiting scales. Organic transients also It has better corrosion inhibition. It is a kind of cathodic corrosion inhibitor that participates in or film. Its complexation with ions is more stable than polyphosphate, so the protective film is stronger.