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screw pipe 3-pass furnace coal fired steam boiler

After years of efforts, the overall governance of Beijing's total coal consumption has achieved initial results. By the end of 2017, all of the total coal consumption of 4.85 million tons, accounting for only 5.6% of the city's total coal consumption, coal-fired completed three years ahead of "Thirteen Five" energy development plan period proposed control in less than five million tons The goal.

By 2013 to 2017 for five consecutive years to promote the work Yajian coal, Beijing successfully completed the first phase of the "Yajian based" Yajian coal work, go to "run mainly to protect", established clean energy use long-term mechanism to combat second phase coal-fired rebound. Beijing's total coal consumption in the future will be long-term control in less than 4.2 million tons, coal is mainly used for urban hazardous waste incineration, energy and protect the city safe operation of remote mountain villages Beijing winter heating three aspects.

As of last heating season, heating central heating proportion of clean energy in Beijing has reached 98%, in addition to parts of Pinggu and Yanqing, Miyun three zones as well as six coal-fired heating boiler room, other regions have achieved heating boilers no Coal.

This year, Beijing will complete the rural village 450 villages, the villagers coal public spaces and 53,000 square meters of agricultural facilities Zizhong change clean energy work, and strive to complete the Yanqing east of central heating central heating fuel in pre-season coal boiler clean energy transformation, in an orderly coal-fired heating center south of Yanqing, Pinggu Riverside, Xinggu, Miyun Taishi Tuen urban and non-built-up areas boiler clean energy transformation.

In addition, this year, Beijing Yanshan Petrochemical Industries will start coal-fired facilities clean energy transformation, and continue to consolidate six districts of the city, the southern plains "No Coal" results have been achieved on the area of ​​clean energy transformation, embargo, ban, ban save bulk coal, to prevent rebound.

Speed ​​up the construction of clean energy facilities, Beijing will work to enhance the rural town of Plains gas pipeline network construction, improve rural consumption of clean energy supply security capacity, promote Plains natural gas pipeline "through town." In the gas network facilities are relatively weak areas, speed up the liquefied natural gas, compressed natural gas supply facilities, increase the supply capacity of natural gas distribution in rural areas. At the same time, we continue to promote the 2018 "from coal to gas," "coal to electricity" supporting gas engineering and construction of power transmission project, to meet the full 2018-- coal to clean energy by 2019 energy demand for the heating season.

The method of adjusting the temperature of the superheated steam heating stove have? The method of adjusting the temperature of the superheated steam heating stove have? DC boiler steam temperature is mainly adjusted by adjusting the quantity of fuel to water. In actual operation, because the efficiency of boiler feed water and fuel heat enthalpy (depends on the water temperature) and the like will change, so the actual boiler operation to ensure the water-fuel ratio of the exact value is not easy. Coal-fired furnace will fluctuate because of the amount of coal and the amount of fuel due to the steam temperature. So, except DC boiler fuel to water ratio as the coarse adjustment means, but also must be used as a method of spray desuperheater means of fine-tuning adjustment. There is also some boiler flue gas recirculation, dampers and methods of the swing center of the flame as an auxiliary adjusting device.

Why horizontal gas screw pipe 3-pass furnace coal fired steam boiler to run under negative pressure? Horizontal Gas-fired steam boilers are generally negative pressure operation, if the pressure is running high temperature flue gas will cause the furnace to burn jet furnace walls and insulation, but also endanger the safety of operating personnel , the negative pressure is not too large, generally -10 ~ -30Pa, small oil-fired boiler is generally because there is no draft fan for the combustion positive pressure. For improving the thermal efficiency of the boiler has the following methods: a low pressure industrial boiler manufacturers has been designed in consideration of the problem of overheating efficiency, device, or change from the flue gas energy aspects is not possible and thus the best energy boiler operation starting from the (here not On the recovered water of vapor condensation). According to statistics survey, the current design of the thermal efficiency of domestic low-voltage industrial boilers is generally 70 to 90%, generally the actual operation of the thermal efficiency of about 60 to 80%, some even below 50%, a small low pressure industrial boilers as long as the operation, maintenance properly, design can achieve the thermal efficiency of the boiler manufacturers. I think the management and operation of the boiler should pay attention to the following points: First, to monitor the boiler exhaust gas temperature. Usually the largest boiler flue gas heat loss is a loss, so control the boiler flue gas temperature is very important, general industrial boilers low pressure gas (mainly refers to less than 10 tons of boiler and pressure of 1.6MPa, the same below) of the exhaust gas temperature is 150 ~ 180 ℃, oil-fired boiler exhaust gas temperature is 210 ~ 240 ℃, when the exhaust gas temperature is too high to find the cause and timely elimination. Causes of high temperature exhaust gas boiler are: a chamber negative pressure is too high, short-circuiting flue gases, the heat pipe 3 soot is too thick, too thick scale pan 4, etc., oil-fired boiler exhaust gas temperature is too high reasons : 1 air not adjusted oil, the oil is not completely burned in the chimney secondary combustion occurs aft, 2 soot too, the need for timely cleaning, the flue gas short circuit 3, 4 is too thick scale, etc. second, the control of boiler blowdown rate. General industrial boiler blowdown rate controlled at 5 to 10%, in the pot of water to ensure that qualified (mainly total alkalinity and pH) under the premise of boiler blowdown rate as low as possible, the sewage to adhere to the "ground row, row less, uniform discharge "principle. Third, the maintenance of good boiler furnace wall insulation. Boiler heat loss is also a relatively large heat losses, now the boiler manufacturers in the manufacturing and design has been well thought out, so we do not need to change, we just trying to be difficult to maintain. Outsourcing surface temperature generally does not exceed the boiler 50 ℃, such as too high will have to find out the reasons, timely elimination. Boiler insulation should always be kept dry for gas boilers, pressure must not run long, or easy to damage the coal furnace wall and gate and so on. Fourth, adjust the ratio of fuel and air volume, complete combustion of the fuel as possible. Small boilers generally do not have the amount of wind testing instruments, we can only go by experience adjustment. For oil-fired boiler, the normal combustion flame was yellow-white, non-glare, flame stability, no visible smoke chimney; for gas boiler, the normal combustion flame as a light yellow, no visible smoke stack, substantially cinder burn coal particles as uniform as possible. Fifth, there must be complete boiler water treatment. Complete boiler water treatment and water quality testing can maximize prevent boiler scaling and correct guidance of the sewage, but it did not do a lot of small boilers, companies usually do not pay attention.

Pressure screw pipe 3-pass furnace coal fired steam boiler shutdown fire you do not know the techniques and precautions steam boiler refers to water heated to a certain temperature parameters and the production of industrial steam boiler, the water in the steam drum is heated to become vapor, fire emits heat in the furnace, It is the principle of the steam boiler. Steam boiler belongs to special equipment, design, processing, manufacturing, installation and use of the boiler must be supervised by technical supervision departments, users only get to use the boiler permits to use steam boilers. Fire pressure steam boiler shutdown is interrupted by slowly burning until the load drops to zero until a planned shutdown. Specific steps are as follows: 1, to reduce boiler load, according to the length of time of shutdown, the seam thicker, the thickness is generally not more than 200 mm, suitable to accelerate the speed of the grate. 2, the distance to the thick seam slag is about 1 mm grate stop rotation of the drum is stopped, the operation of the induced draft fan, blowing off a small segment of the regulating plate stopper and dampers qs, relying on natural ventilation to maintain coal lean-burn, the sewage, boiler water level will rise to the maximum allowable level. If the fire burn coal gate, grate can be switched on again, the gas will move back some distance. 3, the recovery boiler needs to run, as long as the opening lead, a blower, to adjust the smoke, and the wind baffle plenum segment adjusting the opening degree of the shutter, the adjustment of combustion steam boiler seam thickness to be normal, start grate, to resume operation .

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