vertical fire water tube boiler

Function of vertical fire water tube boiler induced fan

For the use of boilers, any component is not to be underestimated, because their joint operation constitutes the operation of the boiler. Today we will talk about the role of the induced draft fan on the boiler.

A general increase in the standard of environmental governance, Huzhou City, Zhejiang Province closely follow the direction of development policy, will gradually phase out coal-fired vertical fire water tube boilers or adapted for the gas boiler. According to statistics, Huzhou City Nanxun five years has eliminated nearly 3,000 small coal-fired boiler, saving 720,000 tons of coal resources.

Remediation process, district departments form a joint working group, while the seizure of small boilers, while helping business transformation. Behind the small boiler one Taiwan "puff", representing a small wood processing, printing and dyeing, textile and a number of high pollution and high energy consumption enterprises. They only destroyed the visual landscape, but also pollutes the lies to be the region's transformation and upgrading process must break the "pots and pans."

Huzhou referred morning Decoration Co., the person in charge mentioned: "In the past coal-fired boiler pollution does not say, but heating is not stable, press only a day after more than 300 wood boiler replacement, productivity improved significantly, now at least a day. can be pressed more than 500. "this shows once production efficiency improvement, enterprise back to the speed can be increased to a year.

After the disappearance of small boilers, or to benefit a lot of people around. "Our village is known for the production and processing of small wood gathering, the family opened the window every morning before'll see a row of chimneys in the distance 'spit black smoke'. Now grinding temperature, steam generator replaced the original coal boiler, surrounding environment has improved significantly. "FEATURE before the flood who lives in the village of Lao Shi sincerely laments.

Improvement in the area of ​​active removal of small boilers companies subsidies, also made detailed provisions on subsidy amount of different types of boilers. Meanwhile, the district has built South Lake thermoelectric, thermoelectric GCL, Guodian three cogeneration projects, the laying of 200 km of heating pipe network, and the end of last year to achieve full coverage of central heating.

Long-term low-pressure steam vertical fire water tube boiler operation will cause any harm at all aspects of boiler operation, there is a relatively common misconception, that is: low-voltage operation of the boiler will save fuel. However, according to party expertise engineers quickly proved that this view is wrong. The thermal equilibrium law, if part of the conversion process to ignore the heat losses, the total energy production needs (load) should be equal to the total energy provided by the combustion of the fuel. Thus, the fuel demand is decided how much the size of the load, rather than the pressure of the steam generated. Low pressure boiler operation, fuel efficiency and steam production are reduced, that is, thermal energy conversion process in the loss of more heat, fuel consumption increases. Long-term low-voltage operation hazards 1, will increase fuel consumption low pressure saturation temperature operation soda mixture is reduced, resulting in lower furnace temperature, at low operating pressure situation if you want to increase the amount of evaporation, the amount of fuel will definitely increase, while the furnace temperature is low can lead to incomplete combustion of fuel, black smoke and other phenomena, the actual amount of fuel consumption is higher than the theoretical value. 2, first of all reduce the quality of steam, boiler water boil, bubble will burst, the steam inside the water film will bring a burst of water vapor into the interior. At the same time, the bubble will break instantaneously generated on the liquid surface cavity, around the furnace instantaneously water influx from the surrounding holes, forming bumps and splashes of water, splashed water droplets into the vapor space easily. Low pressure boiler operation, the steam specific volume increase, the level of boiler water to produce more and bigger bubble, more intense level fluctuation. These will carry more water out of the water bubble burst, it will inevitably produce more and bigger hole, and thus lead to more intense shock and splash water, more water droplets into the vapor space. Second, low-voltage operation, the steam flow rate increases, allowing more water droplets by gravity back into the water can not be brought into the steam system, leading to serious boiler with water. More serious it is, when the output is too low steam pressure, the heat capacity of the boiler is reduced, resistance to fluctuations in the load will fall. 3, reducing the efficiency of using the device with water, steam, chemicals and wherein other impurities will be deposited which is formed after an accumulation of dirt; In addition, the water vapor will reduce the evaporation enthalpy of the steam, the heat exchange efficiency with steam actuation device has decreased. Case also appears big horse car, it will cause some waste of energy. 4, endangering personal safety when the steam pipe contains a lot of water, if at some point because of the instantaneous load and increase the steam flow rate increase will happen "water hammer" phenomenon, would seriously endanger the safety equipment and even staff. 5, resulting in low pressure etching operation, the temperature of the boiler furnace and the exhaust gas temperature will be reduced, in the rear of the boiler flue gas temperature upon heating surface is reduced to below the dew point causes corrosion economizer and an air preheater, equipment damage acceleration time. 6, low-voltage operation environment pollution will cause incomplete combustion of fuel, then there will be incomplete combustion of natural gas, resulting in the boiler chimney black smoke, pollution, ecological environment. Conclusion low-voltage operation of the boiler is a completely wrong way, irreversible adverse effects of the various components and the overall boiler will. I hope you pay attention to the boiler must focus on the operating pressure of the boiler at runtime.

How Henan gas vertical fire water tube boiler flue gas to reduce combustion temperature by using Henan gas boiler flue gas recirculation control NOx by external and internal flue gas recirculation techniques. Reduction of the combustion temperature Henan gas boiler flue gas can be achieved by adding the flame region, thereby absorbing the added flue gas lowers the combustion temperature. Henan gas boiler combustion products through the flue gas is added to the combustion zone, not only lowers the combustion temperature, NOx formation is reduced; simultaneously added to the flue gas reduces the oxygen partial pressure, oxygen and nitrogen that will reduce the thermal NOx generated process, thereby reducing the formation of NOx. Depending on the application of the principle, flue gas recirculation applied in two ways, Henan gas boiler are recirculated flue gas recirculation and internal external flue gas. For external flue gas recirculation techniques boiler, the flue gas from the outlet of the boiler via an external conduit, re-added to the furnace. According to the study, external flue gas recirculation Henan gas boiler can be reduced to 70% of NOx formation. The ratio of the outer loop NOx control effect has a greater impact, as the outer loop increases the proportion of NOx reduction rates are more obvious, but the electrical energy consumption for circulating air will also increase. For internal boiler flue gas recirculation, gas back into the combustion zone through the main dynamics of the gas burner. Primarily through internal flue gas recirculation speed jet flame entrainment or swirl burner so that the air flow generated rotational achieve a circulating effect. It is generated by using a cyclone or a tangential inlet into a gas stream with a stream tangential velocity, i.e., rotation of a vortex. The strength of the vortex may be a dimensionless swirl number S of FIG. When the degree of swirl exceeds 0.6, the gas stream will have sufficient radial and axial pressure gradients, which can cause reverse airflow, to produce a circular center of the flame recirculation zone.

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