7 mw condensing coal fired hot water boiler

7 mw condensing coal fired hot water boiler

You have to know the energy consumption of boiler problems (flue gas oxygen content) 1, reasons 1.1 boiler leakage problems may increase the furnace exit of excess air ratio. 1.2 preheater leakage large. 1.3 or coal boiler load changes, wind, dust adjustment is not timely. 1.4 auxiliary burner throttle opening degree command deviations. 1.5 burner type, operation mode unreasonable. 1.6 determine the optimum boiler oxygen value is not accurate. 1.7 oxygen inaccurate measurements. 2, measures to address the problem of operational measures 2.1 2.1.1 Check to see if the fire door, be sure to close tight. 2.1.2 appropriate control the furnace pressure, amount of air leakage reduction furnace. 2.1.3 boiler load, when the quality variation, adjusting one, two air flow to maintain the optimal oxygen amount boiler control value. 2.1.4 maintain the normal water level in the water seal bottom, bottom to reduce the amount of air leakage. 2.2 carry out leakage test and damper characteristics before and after the test boiler maintenance routine maintenance and testing 2.2.1. 2.2.2 adjusted to optimize the combustion tests, the optimum value of oxygen boilers. 2.2.3 regularly test the air preheater leakage, provide the basis for air leakage control. 2.2.4 Periodic calibration of oxygen measuring devices to ensure the accuracy of measurement. 2.2.5 timely check and adjust the position of Flue Gas baffle system (such as: an auxiliary burner class inspection throttle opening degree, etc.), the identify problems in time. 2.3 2.3.1 downtime and a wear liner release duct, deformation, cracks, wear inspection process. 2.3.2 flue pressure test done to check the tightness of handling the leaking part. 2.3.3 flue damper position, the opening degree of chipping, deformation, loose seal, astringent card check process. 2.3.4 corrected assist air and the fuel damper flap opening position. 2.3.5 boiler, air preheater Leakage leak plugging. 2.3.5.1 boiler: furnace wall, roof sealing, see the fire holes, Manhole, bottom sealing plate is deformed, corrosion and tank leakage inspection process. 2.3.5.2 air preheater seal gap measurement adjustment, the deformation of the sector plate and curved plate, wear control check, the sealing gap adjustment mechanism inspection process. 2.4 2.4.1 transformation and a duct liner wear loose, deformation, cracks, wear inspection process, replacement, and a bluff body concentrator ceramic sheet, and silicon carbide wear measures. 2.4.2 boiler, air preheater, leakage leak plugging treatment. 2.4.3 the internal structure and the sealing means to transform the preheater, reducing air leakage. 2.4.4 boiler, flue joints and other advanced seal plastic material, to reduce leakage.

Details of operation of the boiler details chemical energy chemical energy Note 1 Note that operation of the boiler, fuel delivery is controlled with respect to the thickness of the layer of coal-fired boilers, the actual operation, the particles of different sizes on the same coal seam, unreasonable distribution, uneven ventilation, combustion is not uniform. The method can be employed uniformly stratified combustion to coal, to improve seam incomplete combustion: first administration of large particles of coal in the lower layer, the upper layer after administration minimal, large particle surface area of ​​small particles of coal, the need to burn a long time, this time is in the air the highest concentration of oxygen lower position; the other hand, small particles of coal on top, large surface area, a low oxygen concentration, full use of excess air. 2, the flow regulating damper excess air ratio is too large, a large loss of smoke; excess air ratio is too small, incomplete combustion loss is large, and therefore need to properly regulate the air flow to minimize loss of two or more. Usually in the flue gas analyzer backpass smoke, the control amount of wind of carbon monoxide is reduced to a reasonable value. For unconditional for gas analysis, empirical judgment by the naked eye can see the flame in the furnace, the flame pale described excess air amount; brown opaque flame, smoke black smoke indicates incomplete combustion. 3, there is a 1mm thick scale surface water quality management experiment boiler heating surface, waste of fuel from about 3% to 5%, in the presence of 3mm thick scale, waste of fuel of about 5% to 10% [3]. Water two general steps: pre-treatment, ion exchange or reverse osmosis. 4, cleaning blowdown gray scale or fouling deposition in the heating surface, increased heat resistance, reduced heat absorption wall, to improve the furnace exit gas temperature, boiler output decreased, but to increase the amount of cast coal, causing furnace exit gas temperature further improve a vicious circle. Therefore, timely cleaning clear dirt is particularly important. 5, the energy efficiency of the heat insulation testing industrial importance boiler showed small boiler in the case of good thermal heat radiation loss is about 3%, if the wrong selection insulation material, the thickness is too small, or even damage, does not include local heat, heat losses will be higher, the boiler has been running, has been caused by waste heat into the air. When the shutdown check whether the furnace wall insulation bricks off; isolated brick flue check is complete, to avoid shorting the flue gas; outer portion boiler, steam pipes and other insulation damage to be repaired; when heat insulation, low thermal conductivity of the material ( i.e., materials with good thermal insulating properties) on the inner layer having a better thermal insulation effect; respond to the economizer outer insulating layer for laying under conditions permitting. 6, to solve the problem of air leakage air leakage boiler boiler unit during operation is a common problem, the need to ensure the tightness of the boiler, furnace air leakage above all, do not close the site to check the furnace wall, door, inspection holes, etc., can be candles law, candles near these places, to observe whether the candle flame inward deflection to judge. Second leakage tail heating surface, the flue stack leakage mostly welding cracks, elbow bend, the expansion joints wear wear; mostly air superheater corrosion or wear leading to leakage through the pipe, the boiler shutdown should focus an examination.

Coal-fired boiler not only seriously polluted air, which produces a large amount of waste water sludge can also cause serious water pollution and soil contamination. To protect the city of Tongren green water blue sky, since 2014, led by the city of Tongren City, Guizhou Bureau of Quality Supervision, of 10 steam tons / hour within built-up areas and Tongren City High-tech Zone, Economic Development Zone, Tai Lung range and below, in Guizhou tobacco industry limited liability company Tongren cigarette factory, Tongren City, drug rehabilitation centers, Tongren Wantong construction and development Co., Ltd. and other 36 enterprises of coal-fired boilers to carry out an intensive diagnostic investigation. One by one on the ground to verify the registration, and the companies signed an undertaking to ban coal-fired boilers eliminated; to effectively reduce the burden on enterprises, according to the spirit of the document, to take the initiative within the time limit or eliminate the use of coal-fired boiler unit to switch to clean energy, the after review and acceptance Municipal Environmental Protection Bureau, according to the amount of coal-fired boilers hour evaporation reward, award criteria tons of steam per 30,000 yuan subsidy.

Up to now, the city of Tongren out of 36 coal-fired boiler units, a total of 43.051 tons of steam, an award subsidies 1,291,530 yuan, so far, the city of Tongren jurisdictions total phase-out of all coal-fired boilers, and lay a good foundation for the creation of ecological civilization demonstration area.

If there is damage in the supposed gas-fired? Detailed inspection is important, as the key oil regulation. According to the conditions and time management, gas-fired, people can effectively damage inspection program. The application of oil, people strictly control the particle size of coal and dolomite. Should strictly control the particle size of bed material. Should be addressed furnace waste. To be able to solve the waste furnace after discharge. Natural gas boiler should be installed in areas where the application of calories, easy to install. Heating pipe can not be too long. It should have a good cable jacket. Water piping for an output from moderate to tail skew. Water resources to be equipped with a pressure regulating valve. As sewage gas, natural gas boiler chimney should widen to the outside, a heating furnace entrance width 1.5 to 2M. If you want to reduce the harm to the water wall tube can be appropriately regulate air pressure and wind speed and reasonable to reduce damage to the water wall. Inspection time is generally standby shutdown or shutdown condition. To check top head comprising the furnace wall is damaged, leakage of the furnace airtight and smoke. In the damaged condition requires immediate repair and welding, in order to ensure that no problem in the operation of steam boilers. Typically, before the ignition of gas-fired, fossil fuels must be added the charge in the combustion chamber, fossil energy and raw material-circulating bed material and gas in the wind, the strength and intensity of the flow down completely integrated. Bottom wind equipment, up for the core area. Exercise our powers in a ring outside the region along the furnace wall water swimming down, thus increasing the waiting time of coal particles in the furnace. Mineral particles, many of the ash and soot particles with a lot of fly ash, this resulting in rapid deterioration of the waterwall tubes continuously, so that damage to the wall thickness becomes soft, resulting in damage.

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