The main reason is the boiler explosion personnel improper operation or other failure causes pressure inside the boiler load is too large, in an instant release after squeeze a lot of energy. Boiler water, the scale too much, too much pressure and so are likely to cause an explosion.
What are the requirements when small aalborg steam boiler safety valve installation? Rated evaporation to a small steam boiler 0.5t h /, at least two safety valves installed; equal to or less than the rated evaporation boiler 0.5t h /, mounted on at least a safety valve. The separable exit of the economizer, steam superheater outlet of the safety valve must be installed. Valve should be mounted vertically at a high position in the pot business, set box. Between the valve and the drum or header, not equipped with access to the steam outlet pipe and the valve. Lever-type safety valve should prevent the movement of the self-weight of the lever means and the deviant restriction guides the spring loaded safety valve should lift and handle means for preventing movement of the adjustment screw is screwed lightly. For rated steam pressure less than or equal to 3.82MPa boiler safety valve throat diameter of not less than 25mm; the rated steam pressure is greater than 3.82MPa boiler safety valve throat diameter of not less than 20mm. Small steam valve and boiler tubes, which cross-sectional area not less than the cross-sectional area of the valve inlet. If several valves installed together with a short tube directly connected to the drum, the cross-sectional area of the passage should not step short tube to 1.25 times the area of all the exhaust valve. Safety valve should normally be installed exhaust pipe, exhaust pipe should be through a safe place, and there is sufficient cross-sectional area to ensure the smooth flow of exhaust. The bottom of the safety valve exhaust pipe should have received a place of safety posturing of drainage pipe, the exhaust pipe and drainage pipe not allow the installation of the valve.
The main mode of combustion control method in industry is the gas boiler applications are more effective and simple control of nitrogen oxides, i.e., the first category. Mainly through optimization of the furnace combustion conditions, optimize the mixing of fuel and air, control the distribution of the flame, the furnace temperature reducing nitrogen oxides to be reduced. There are several common methods: ● The air-staged combustion air required for combustion with staged combustion of the fuel mixture, and reducing the combustion flame temperature strength. The secondary air outlet for high speed, roll seats around the flue, so that flue gas recirculation in the furnace. Classifying air distribution while reducing the temperature at the center of the flame, on the other hand dilutes the oxygen concentration of the flame surface, thereby suppressing generation of NOX. ● a fuel staged combustion refers to combustion of fuel grade gas into the furnace from a different region, such that the fuel in stages, sub-area for combustion. Full use of space in the combustion chamber, the fuel will be dispersed arrangement, reducing the concentration of the flame, the temperature of the high temperature reduction zone. Usually low nitrogen ● staged combustion burner air staging and fuel staging combination, collectively referred to staged combustion technique. Staged combustion technique is through a combination of the principles of the substance and peroxy oxygen-depleted, flame dispersed, reduced flame temperature, furnace flue gas to promote local circulation, form a reducing atmosphere, it has been generated by partial reduction of NO to N2, thereby controlling the total amount of emissions of NOx concentration. Although mixed staged combustion technique may reduce to some extent the generation of nitrogen oxides, but many of the burner and combustion air is not fully realized in the actual use of the gas, high temperature furnace in the local memory area, which is higher than the temperature of thermal NOx generated , resulting in excessive NOx concentration. On the other hand, there may be poor mixing of fuel and air flow, resulting in excessive carbon monoxide, partially incomplete combustion of carbon and other phenomena. In order to lower the reaction temperature, it is necessary to make as flame dispersed expanded flame shape, that is required in conjunction with the use of the furnace, and the furnace is mostly the case is limited volume, in order to avoid excessive furnace flame opposing, generally reduces the output power of the burner , which can reduce NOx concentration and ensure full combustion, but the drawback is the power boiler has declined, but there is a risk of flue gas condensation. According to the relevant literature and the actual operation data, generally of staged combustion can be controlled at the concentration of NOx emissions 60 ~ 80mg / m3, to meet national standards, but for many existing local standards, this technology can not meet. In practical application, it will be staged combustion and flue gas recirculation techniques (of FGR) combined application, in order to meet emission requirements 30mg / m3 of. ● flue gas recirculation techniques (of FGR) technology refers to flue gas recirculation is part of the flue gas after combustion (mainly for water vapor, carbon dioxide and nitrogen) is returned to the burner drawn, mixed with fresh air is involved in combustion. Recirculated flue gas temperature and the flame temperature in the furnace is much lower than is possible to significantly reduce the temperature in the furnace, to reduce the furnace volume heat intensity. Meanwhile, since the introduction of the low flue gas oxygen content in the furnace can effectively reduce the oxygen concentration in the furnace, effective to inhibit the formation of NOx. Flue gas recirculation principle: the low temperature flue gases directly into the furnace section, or with air (primary air or secondary air) mixed into the furnace, the flue gas due to heat absorption and dilution of the oxygen concentration, the combustion speed and the furnace the temperature decreases, thereby reducing thermal NOX. For gas-fired boiler, NOX reducing the most significant. Typically, there are ways to generate thermal type (T-NO), the fast type (P-NO) and the fuel type (F-NO) 3 types. Flue gas recirculation system and the gas burner is connected to an inert gas circulating in the flue gas into the burner, the flame propagation speed is reduced on the one hand, on the other hand the level of temperature in the furnace heat absorption decreased, the absolute decrease in flame temperature, reach generation temperature, thereby suppressing the formation of T-NO. Other components of a large number of circulation flue gas N2, CO2, H2O, due to the mixing of the circulating gas, air and flue gas mixture, the oxygen concentration, thus affecting the amount of production. Mixing the flue gas circulating in the air, i.e. increase the content in the reaction of N2. Since oxygen atoms and nitrogen molecules in the activation energy required for the activation energy required for the reaction is large, the large volume of nitrogen is not directly react with oxygen to generate NO, and hydrocarbons in the reaction with the fuel component in the fuel ratio of oxygen and combustible components of the reaction. N2 is increased a lot of positive reaction formula, a large amount of intermediate product HCN. And the oxygen atoms react with the flue gas and thus the occurrence of these intermediates First, HCN O2 with the following overall reaction in an oxygen-poor environment: HCN + 5 / 4O2 → 1 / 2N2 + CO2 + 1 / 2H2O by the formula (2-5) seen in the concentration of oxygen lean combustion conditions, HCN finally generated N2. Thus With regard to flue gas recirculation intermediate HCN increased, while on the other hand does not use the previous O2 concentration reducing flue gas recirculation, prompting for completion of the reaction, N2 generation amount drastically increased, thereby reducing the P-NO generation. ● a water-cooled flame combustion technology burner is surrounded by a cooling water, to remove heat by cooling water pipe, reduce the flame temperature, thereby destroying the nitrogen oxide formation conditions. Is generally used together with premixed combustion technology, premixed combustion can effectively reduce the flame length, the shorter the flame can be sufficiently cool the cooling pipe. This technique can effectively reduce NOx emission concentrations, but not broad. The water cooling, so for most of the project, due to the structure of the furnace can not transform, so this technique can not be applied. Water-cooled combustion basically only apply to replacement case or Case new design of the furnace. Further, such a dedicated furnace with burners generally, instead of a generic burner, the burner fails once, the user may select the burner is very limited.
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