18tons oil fired hot water boiler

Structure and characteristics of Water Tube Boiler (double Longitudinal Tube Boiler)

The structure of the double vertical tube water tube boiler is mainly composed of upper and lower vertical tube, convection tube bundle, water wall tube, header box and down tube and other pressure-receiving components. The length of the lower drum is about half shorter than that of the upper drum. The empty space is provided with a furnace, a curved water pipe is arranged between the two drums, and a water wall tube is arranged around the furnace. The burning equipment adopts a gas/oil burner, and the tail flue has an economizer. The boiler evaporation is generally less than 20 tons / hour (t / h), the working pressure is less than 2.5 MPa (MPa). The high-temperature flue gas enters the rear convection flue from the right exit of the furnace, flows in an S shape along the two smoke-proof walls, flushes the convection tube bundle laterally, and then flows through the economizer from the left side of the furnace wall, and is discharged by the induced draft fan and the chimney.

Improve the thermal efficiency of the process wns gas boiler, oil-fired boiler which chemical incomplete combustion heat loss and mechanical incomplete combustion heat loss. Because almost no ash after combustion of the gas boiler, solid and liquid fuels without mechanical incomplete combustion, there is no need to consider the mechanical incomplete combustion of the gas boiler heat loss. In all heat losses, heat losses have tremendous proportions, when the high thermal efficiency of boilers, heat losses so the total loss of the main heat losses of fuel gas-fired boiler flue gas heat loss is the exhaust gas temperature and For air excess factor. When the exhaust gas temperature decreases, high thermal efficiency can be obtained, for example, a conventional three-pass steam boiler, furnace used in the past straight and smooth smoke tube, must increase the heating surface is arranged to make the exhaust gas to an acceptable degree, the theoretical discharge around the smoke heat loss. Potshell causing significantly increased diameter, wall thickness increased, greatly increased metal consumption, thus further reducing the exhaust gas temperature should be greatly restricted. From the aspect of heat transfer is not only now consider only the heated area, the use of new technology enables heat transfer performance significantly increased, the difference between the heat transfer overcomes the disadvantages of the past performance of the boiler, so that the exhaust gas temperature decreases, the structure is more compact. Center back boiler combustion boiler is preferably small foreign structure, although the two-pass boiler, the heated area is small, but the use of the turbulator charming, the purpose of enhancing the turbulence of the flue gas, disrupt laminar flow boundary wall, reducing the thermal resistance, increasing the heat transfer coefficient, a smaller heating area to achieve the same high thermal efficiency. Lower exhaust gas temperature limit in theory, the exhaust gas temperature can be reduced to very low or even close to the ambient temperature, for maximum thermal efficiency. However, in practice, due to the reduction of the exhaust gas temperature, low temperature corrosion will cause, therefore, the exhaust gas temperature can drop too low, in order to ensure that the wall temperature is higher than the main boiler heating surface flue gas dew point temperature. Therefore, low-temperature corrosion has become a major obstacle to reduce exhaust gas temperature and improve the thermal efficiency of the boiler. Tail auxiliary heating surface increases, further reducing the exhaust gas temperature, fuel gas wns improve thermal efficiency of the boiler as the oil, gas fuel burn easily wns type gas boiler air preheater generally not disposed. The economizer means is a common energy, which can be recycled flue gas was able to effectively reduce exhaust gas temperature. Separation type condensing gas boiler is out of the main boiler heating surface, the installation of the condensing heat exchanger. In one aspect of the flue gas absorption can significantly reduce the smoke temperature, reducing heat losses, on the one hand the absorption of part of the potential condensing water vapor released, increasing the effective use of heat of the fuel. Ash cleaning, to ensure that the heating surface of the scale wns boiler thermal efficiency of the boiler, the presence of soot fouling and heat transfer resistance increases, reducing the heat transfer effect. The thermal conductivity of the scale and soot is almost of the same order of magnitude, with the increase in scale, soot, the exhaust gas temperature rapidly increases, the thermal efficiency is significantly decreased. So, keep the boiler heating surface inside and outside clean, efficient heat transfer, thermal efficiency and to ensure the safe and economic operation of boilers, boiler fuel gas-fired boiler ash cleaning is required.

Boiler basic knowledge and principle: as a heat carrier, pump forced circulation of liquid phase, then return to reheating, direct-flow special industrial furnace. Widely used in foundry sand molds such as petrochemical, textile, printing and dyeing, plastics, rubber, food processing, wood processing, asphalt heat, carton production, vegetable dehydration, drying and so on. Boiler is an energy, safe, heating equipment, is an ideal alternative to steam boiler products. The working principle is that the oil heater (endothermic) (organic heat) which is transported to the various thermal equipment after heating, the heat conduction (heat energy release), and then back to the furnace, forming a closed circle in the sense of meaning. In order to achieve the purpose of heating in the process of education. Performance and characteristics: 1, low pressure and high temperature. With the increase of temperature, the viscosity of the oil will continue to decrease the resistance of the system, but also reduce the working pressure, more conducive to safe operation and safe operation. Steam boiler is a high temperature and high pressure plume. 2 the heating system adopts hot water and equipment inlet and outlet temperature of 20? 30 degrees closed-circuit forced circulation heat can be recycled repeatedly there is no waste thermal efficiency is high energy-saving effect is remarkable. (3) the pressure of the heating system is low and the requirements of the pressure equipment and its system will also be reduced accordingly. Therefore, the steam pot required by the production process is accordingly reduced. The furnace is simple and the investment cost is low. 4, the thermal efficiency of various loads can be maintained at an optimal level, and can be adapted to the production of heat load requirements of the following types of 320 degrees, temperature can be accurately adjusted and controlled. 5, heaters to increase two to three times the cycle can provide a wide range of temperature processes for a variety of equipment to meet different temperatures that greatly reduce the need for equipment investment.

The Fangkuai Group's unique full-operating boiler operation laboratory has an annual operating cost of more than 5 million yuan, which can simulate the operating conditions of various types of boilers under multi-operating environment conditions. The laboratory provides technical tests such as test and inspection, analysis and evaluation, data evaluation, energy saving and environmental protection, and special software from materials to complete equipment, hardware to software, and even complex large systems.

18Tons Hot Water Boiler N Chemical Engineering

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