Natural Gas fired hot water boiler Dealer Myanmar

Exhaust gas has been plagued by sewage paper industry, paper industry pollution problems of the country very seriously. Fujian Heng paper packaging company has been committed to the use of clean-type boiler paper processing. October 22, 2016, David Carse, the paper with my company, signed a 6 tons of steam an integral condensing steam boiler for the production of corrugated cardboard and other paper products. I provided the boiler greatly solve the problem of sewage wastewater Heng paper. After the boiler operation, both to meet local environmental requirements, but also reduce operating costs for the constant boiler paper products.

Note the boiler operating at low load range of the boiler load change is normal: coal-fired boilers typically 70% -100% of rated evaporation; oil furnace is 60% -100% of rated evaporation. Below this range is the low-load operation. The main problem is the low-load operation, poor combustion stability, we must prevent the fire and explosion at the furnace, natural circulation boiler must also consider the safety of the water cycle. Thus, when low load operation, the boiler attention to the following aspects: 1, should be as low-load burning high volatile coal. When low volatile coal, during unstable combustion, combustion should be put into the ignition oil gun, in order to prevent possible fire. 2, input at low load the burner should be more uniform, the number of burners should not be too small, which is good for both combustion stability and prevent individual parts of the water circulation is not normal. 3, the speed should be slow changes in the load, and adjust the air volume. Note that maintain a steady wind pressure, which should be the primary air volume is too large. Burner input and deactivation operation should be slow. 4, oil-fired boiler during low load operation, since it is difficult to ensure the combustion quality of oil, should be taken to prevent droplets caused by the re-ignition of unburnt flue tail. 5, low load operation, to minimize the use of desuperheating water (mixing desuperheater), but it should not be heated Save the door shut. 6, low load operation, the exhaust gas temperature is low, the possibility of low temperature corrosion is increased. Therefore, they should put warm or hot air recirculation.

Why boiler furnace exhaust gas temperature increases heat losses the heat loss is largest in a boiler, furnace 6% is generally fed to the heat, the exhaust gas temperature increasing every 12 ~ 15 ℃, heat losses to an increase of 0.5%. Therefore, the exhaust gas temperature is one of the most important indicators boiler operation. Here are a few reasons may cause the furnace exhaust gas temperature rise: (1) heating surface slagging, fouling. Whether waterwall slagging furnace fouling, or superheater, convection bank, and economizer preheater fouling are due to increased resistance measured smoke, heat deterioration of the cooling effect deteriorates the flue gas, resulting in increased exhaust gas temperature. (2) the excess air ratio is too large. Under normal circumstances, the furnace outlet increases as the excess air ratio of the exhaust gas temperature rises. After the excess air ratio increases, while the amount of smoke increases, the speed increase of smoke, heat strengthening of exiled, but less than the degree of increase in heat transfer gas volume increases more. It will be appreciated as the tobacco rate increased, the time to heat to the flue gas working fluid left the heating surface. (3) leakage factor is too large. Tail shaft furnace and boiler flue negative pressure leakage is inevitable, and provides a heating surface allowed leakage coefficient. When the coefficient of air leakage increases, the influence of the exhaust gas temperature and overfire air coefficient increases similarly. And the closer the leakage furnace, exhaust gas temperature raising effect on the greater. (4) water temperature. When the turbine load is low or high pressure splitting when the heater temperature of the boiler feedwater will decrease. Generally, when the water temperature rises, if the amount of fuel is maintained constant, the temperature difference decreases economizer, economizer heat absorption decreases the exhaust gas temperature rises. (5) the fuel moisture. The fuel in the flue gas to increase the amount of water increases, and therefore the exhaust gas temperature rises. (6) boiler load. Although the boiler load increases, the amount of smoke, the amount of steam to the water, the air amount increases in proportion, but since the furnace exit gas temperature is increased, so that the exhaust gas temperature rises. After the load is increased to increase the furnace outlet temperature, followed by convection heating surface temperature difference increases, an increase in heat absorption, the more so the convection heating surface, the smaller the impact load change of a boiler exhaust gas temperature. (7) The fuel species. When burning low calorific value gas, since the furnace temperature is lowered to reduce the radiation heat transfer in the furnace, the low calorific value gas in a non-combustible components, mainly N2, CO2, H2O more, the amount of flue gas increases, the exhaust gas temperature rise high. Pulverized after burning oil, although oil-fired furnace outlet when the excess air ratio than the coal is low, but the little ash fuel oil, and no larger soot particles, larger ash particles in the flue gas absent the cleaning action of surface heating, convection heating surface more polluting. So bad combustion, often black smoke boiler flue gas temperature. When the tail has means ash ball, since the tail cleaner, the exhaust gas temperature is slightly lower than the burning coal. (8) milling system operation. Bunker has a reservoir of closed milling system is concerned, when the pulverizing system is running, because a portion of the water in the fuel into the furnace, the furnace temperature is reduced and the amount of smoke increases, the leakage into the pulverizing system is running as the primary cold air air into the furnace, to reduce the amount of air flowing through the air preheater to the exhaust gas temperature rises. Conversely, when the exhaust gas temperature is reduced pulverizing system outage.

Fire tube steam boiler manufacturer in Germany

Fire tube steam boiler that is the flue gas generated after the combustion of the fuel flows through the fire tube or the tobacco pipe, and heats the water, steam or steam-water mixture outside the fire tube or the smoke pipe, has developed many years in Germany, the technology is ripe, fire tube steam boiler from ZG fuel is gas or oil, for example natural gas, city gas, light oil, heavy oil, diesel oil, and so on. For the Environmental, fire tube steam boiler is supported by Government and enterprise.