Several problems into a coal-fired boiler fuel gas boiler fired boilers changed several issues should be noted that the fuel gas boiler: fuel oil (l) high temperature corrosion of the fuel used in the boiler, containing an organic salt of a metal element as sodium, vanadium class, after combustion of the low melting point eutectic oxide crystals, generally of about 600 ℃, or even lower. These oxides sublimation at a high temperature furnace, then condensed in a lower relative temperature of the heated surface to form a high temperature corrosive fouling. Is characterized by high temperature corrosion: the metal began to appear at temperatures in excess of 580-620 deg.] C, the higher the temperature, the faster the etching. High temperature corrosion measures to prevent: l) the use of additives. Mainly magnesium, calcium oxide, hydroxide or dolomite (CaC03, MgCO3) and the like, these additives can generate a high melting point compound with the component acting in a high temperature fouling, the fouling becomes loose and shape, so as to avoid or mitigate high temperature corrosion. 2) use high temperature materials with good corrosion resistance, high temperature corrosion resistant chromium steel is better than the nickel-chromium steel. 3) coated with a protective film. Susceptible to corrosion in high temperature heating surface ceramic surface coating, a silicon carbide or silicon nitride special coatings, the heated surface may be aluminized other treatment to improve its high temperature resistance. 3) coated with a protective film. Susceptible to corrosion in high temperature heating surface and other surface-coated ceramics, silicon carbide, silicon nitride, or special coatings, the heated surface may be aluminized other treatment to improve its high temperature performance rot cloud. (2) low temperature corrosion in fuel sulfur generated during the combustion S02, since the fouling atomic oxygen present in the furnace and the convection heating surface and catalytic oxide film, SO2 is further oxidized to S03. S03 and H2S04 vapor in flue gas generated in conjunction with, the dew point of the flue gas containing the sulfuric acid vapor is greatly increased, when heated wall temperature below the dew point of sulfuric acid vapor will condense on the walls, and corrosion of the metal wall. Usually low temperature corrosion It occurs at the end of the air preheater of the boiler. Thus when burning high sulfur fuel, care must be taken to prevent low temperature corrosion. Prevent low temperature corrosion measures are: 1) low oxygen combustion. When the excess air at the outlet of the furnace lag coefficient down to 1.10 or less, for sulfur of the fuel oil used, the dew point of the flue gas will be significantly decreased, so as to avoid or mitigate low temperature corrosion. 2) use of additives. Sprayed into the furnace or flue additive in the curb generation of SO3 and to reduce the flue gas dew point temperature. Common additives solid (dolomite, limestone, magnesium oxide, and some special compound), the liquid (aqueous magnesium chloride solution, some oil soluble magnesium, calcium, zinc naphthenate compound) and a gas (ammonia gas, ammonia, three different ring) three categories. 3) raising the thermal wall temperature, so that it is higher than the dew point temperature of flue gas. Commonly used methods are: hot air recirculation inlet temperature of the air preheater increase; the installation of the heater core, air is heated by steam, a low temperature air preheater horizontal structure, the level of a horizontal pipe line is arranged an air preheater , the air flow in the pipe, the pipe between the smoke flow, erosion due to the lateral wall of the flue gas, the flue gas side heat transfer coefficient is increased to increase the wall temperature, more generally vertical wall temperature of the air preheater increase 20 ~ 25 ℃. 4) corrosion-resistant materials or corrosion resistant coating materials include glass, ceramics and the like; an anti-corrosion coating and had tried to enamel-coated surfaces like special steel anticorrosion paint. 5) timely sootblowing operation, and therefore should be a reasonable arrangement sootblowers. Fire and explosion of fuel failure (3) heating surface of the tail or incomplete combustion of atomized droplets gather in the tail of the heating surface, when it reaches ignition or explosion conditions, i.e., ignition and explosion may occur. The tail heating surface fouling aggravated by the possibility of aggregation of the oil droplets. Therefore, when coal-fired boilers into oil-fired boiler, burner should be correct and rational selection and delivery, and strictly develop from the induced draft fan. Rules and procedures for shutdown and normal operation to ensure good fuel atomization, with the wind reasonable. At each of the heating surface is arranged to be reasonable sootblowers. (4) determining the dew point temperature of flue gas is determined dew-point temperature of the flue gas has practical significance for the design and operation of flue gas dew point temperature factors influence mainly sulfur fuel ink, excess air coefficient, water vapor in the flue the amount of sulfur / cement ratio and combustion.
Contrast gas 6t fired steam boiler and gas steam boiler? Which is more cost-effective? There are new users will ask gas steam boiler and gas steam boiler which is more cost-effective in a number of economic operation? Believed to be ready to buy a steam boiler of every business relationship or personally, with you today, I will work together to analyze these two boilers in operating costs to do a comparison. First, the first point to analyze procurement costs: Because gas steam boiler in the annex above techniques and configurations to be clear leadership and gas steam boiler, gas steam boiler supporting a dedicated burner, a burner just put the cost price opened, so that the same tonnage of steam boilers, steam boilers high gas prices than gas steam boiler more. The second point to analyze construction costs: The costs mainly from the boiler room, boiler tubes of steam investment funds. In which the gas steam boiler because more appropriate auxiliary equipment, so in the boiler room construction funds to be more. There is a gas steam boiler automatic control operation, and automatic alarm and automatic protection function. Connected to the gas pipeline, the burner will automatically supply costs can effectively save staff. Gas-fired steam boiler because of the need of coal on the program, so in terms of personnel expenses wage will be larger. The third point to analyze the environmental cost: major review means that now more stringent gas steam boiler. The gas steam boiler due to the operation of the economy, environmental protection and energy saving, as well as government policy to encourage more and more widely used. The fourth point to analyze fuel costs: gas steam boiler will be much higher than the steam boilers in gas fuels. After analyzing the above four points of view than the gas steam boiler Gas steam boiler in order to save more on operating costs, but gas steam boiler environmental protection, now increased pollution than gas steam boiler in environmental protection in recent years so the state more stringent control of environmental pollution, so in accordance with the requirements of environmental protection point of view has an advantage gas steam boiler.
Since "strong piece autumn and winter air pollution in a comprehensive way, determined to win the Battle of Hebei blue sky" press conference was informed, Hebei Province, to make arrangements for winning the Battle of the blue sky, requested the preparation of implementation of the blue Battle Hebei Province Government Information Office held three-year operational plan and cleaning winter heating three-year plan to ensure that changes every year, three years, a large bear fruit.
Really good job of air pollution prevention and control work in the past year, Hebei Province, adhere to the scientific governance haze, collaborative governance haze, haze iron-fisted rule, will coordinate development of pressure energy, reduce coal, running enterprises, dust, vehicle control, by Green et key tasks, play a set of tackling the problem, the main root of the problem "combination punches." Where the complete substitution of gas for coal, electricity-generation coal transformation 2,537,000, Yajian steel production capacity of 27.54 million tons, 21.32 million tons of iron, coke 8.088 million tons, 10.68 million tons of coal, Reconstructing "scattered dirt" Enterprise 38785, off stop banned enterprises 68747, the new afforestation area of 741 hectares. At the same time, also launched a special inspection of law enforcement inspectors and four comprehensive management of air pollution, to carry out unannounced visits to check the dark, spot checks, cross-law enforcement, road law enforcement to crack down on environmental violations, and earnestly solve the "last kilometer" problem.
Director, Office of Atmospheric Hebei Province, the provincial Environmental Protection Bureau Director Gao Jianmin, said: "This year we will develop science of air pollution control 3-year operational plan, a clear timetable, route map, to promote the key cities 'insurance bottom line, back ten' focus on tackling to ensure that air quality 'changes every year, three large effective', and strive to Shijiazhuang, Hengshui, Tangshan City, the first exit after ten. we will actually improve air quality and enhance, to better respond to the concerns of the masses, improve people's livelihood well-being, and enhance people's sense of well-being obtained. "
Gas steam thermal cracking reaction furnace gas steam oven should be carefully introduced reflect in the use, to guard against water, acid, alkali and leakage into the low boilers using the system, the system should be installed filters installed to prevent debris into various types, to ensure the purity of the oil . Gas and steam is easily oxidized during heating, the acid value of the oil is increased at high temperatures and a large change rate. Steam oven gas kinematic viscosity gradually increases, which is due to the thermal cracking gas vapor component at high temperature, thermal polycondensation reaction. Thermal cracking reaction resulting in generation of small molecule compounds, to reduce its viscosity; oxidation temperature when the inner conduit thermally cleavage occurs at 300 ~ 400 ℃, coke formation in the pipe, the inner wall of the device, leading to heat accumulation pipe affect the heat transfer efficiency, sludge poor flowability, transfer oil accelerated aging failure, but also to the furnace, pipes local overheating, impairing the mechanical strength of the threat to personal safety.Free Chat
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