In the boiler plant 8t estonia, the exhaust temperature is between 160 ℃ and 250 ℃, and the steam in the flue gas is still in the overheated state. It is impossible to condense into liquid water and give out the latent heat of vaporization. It is well known that the boiler thermal efficiency is calculated by the fuel low calorific value without considering the heat loss of vaporization latent heat in the fuel high calorific value. As a result, the thermal efficiency of conventional boilers can only reach 87% / 91%. The condensing waste heat recovery boiler reduces the exhaust temperature to 50 ℃ and 70 ℃, which fully reclaims the sensible heat in flue gas and the latent heat of condensation of water vapor. Recovery of steam volume in boiler flue gas by condensing waste heat using natural gas as fuel At 15%-19%, the steam content in the flue gas of the oil-fired boiler is 10%-12%, which is much higher than that in the flue gas of the coal-fired boiler, which is less than 6%. At present, the boiler thermal efficiency is calculated by low-level heat generation. Although nominal thermal efficiency is high, because of the high natural gas, the difference of low-level heat-generating value is about 10%, the actual energy utilization rate still needs to be improved. In order to make full use of energy, reduce the exhaust temperature and recover the physical heat energy of flue gas, when the wall temperature of the heat exchanger is lower than the dew point temperature of the flue gas, the steam in the flue gas will be condensed and the latent heat will be released. 10% of the high and low calorific difference can be used effectively.
Boiler and specify different holes for boiler plant 8t estonia corrosion, the following is mainly to answer some specific questions, which mainly are: the boiler furnace in the manholes and hand holes, which specifically refers to what? In addition, for low and high temperature boiler corrosion, how should it be understood? These are the problems associated with the boiler, therefore, let's learn it. 1. boiler furnace in the manholes and hand holes in the boiler, manholes, which refers to access for people in the sewer, etc. in order to carry out maintenance work. And thus it can enter and leave Pai Road, boilers and water pipes and other such facilities. The hand hole, which can be considered to reduce the manhole. Mounting object thereof is to facilitate the installation, removal, cleaning and maintenance work, namely, to facilitate the work of some of the internal device boiler. These two, is basically the same in structure, and is a short tube section of blind plates. In diameter, hand hole is 150-200mm, and there DN150, DN250 both nominal diameter. The manhole is in the 1000mn above. 2. The low temperature low and high temperature corrosion of boiler corrosion boiler: heating surface in the rear of the boiler, such as an air preheater and economizer, etc., if present, and sulfuric acid, then combine with water vapor to form sulfuric acid vapor, together with the temperature is not high, the sulfuric acid vapor will condense on the heating surface, thus forming the sulfuric acid corrosion, that is, low temperature corrosion. And, it is mainly found in the air preheater, but again there will be the economizer. High-temperature corrosion of the boiler: the boiler at a high temperature state, an alkali metal sublimation, and the flue gas is reacted with sulfur trioxide to produce a composite sulfate, then, have a heating surface tubes and boiler wall, causing corrosion. So, these one corrosion, known as high-temperature corrosion. Also, pay attention to that which is generally repeated, if not promptly treated, then the wall will gradually thinning, the worst case, there will be burst pipes phenomenon.
It is reported that in March 28, the Office of the ecological environment in Gansu Province on environmental governance ecology, held a press conference. Will be mentioned in: 2019, Gansu Province will improve air quality for the goal, to strengthen air pollution control work. 2019 air pollution prevention and control measures are: to adjust the energy structure, clean winter heating in an orderly way, and then completed more than 400,000 rural residents warm Tukang years Tuzao, small stove coal to gas, coal to electricity or clean coal replacement project; built a sound 86 counties (cities, districts) focused on coal distribution system, formulate issued "the province's reservoirs (for sale) coal yard special clean-up remediation work plan" to carry out the coal market, coal quality control special inspection inspection, serious investigated sales of low quality coal, coal yard dirty and messy and other issues.
1, adjusting the industrial structure, the implementation of "scattered pollution" enterprise remediation special action, complete ban before the end of the relocation, renovation work; continue to promote urban built-up area of heavily polluting enterprises relocation, renovation or off exit, according to the law to promote backward production capacity in accordance with regulations can quit, support and foster a number of competitive energy-saving and environmental protection enterprises.
2, accelerate the implementation of the transformation of ultra-low emissions of thermal power, steel and other key industries, before the end of the year plans to complete within 10 coal-fired thermal power ultra-low emission renovation (except long discontinued); implementation of key enterprise organized, unorganized emission control standards by the end of before the completion of discharge standards smelting production company boiler.
Method desiccant in the boiler plant 8t estonia is deactivated, when the temperature of the boiler water is reduced to 100 ~ 120 ℃, to let go all the water in the boiler, using residual heat in the furnace, the dried metal surface, and to remove the water in the boiler system scale and water residue inside. Then placed in the boiler desiccant, holding the metal surface and dried, to prevent corrosion.