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.
Prevention of industrial boilers produce condensate hazardous industrial boilers which produce condensed water hazard control measures which 1, bold and hydrophobic visible drainage pipe in the boiler inspection process and found that the condensate is not easy to accumulate in the water-tube boiler, while the horizontal boiler shell boiler drain more, but part of the boiler there is still a large amount of condensate (most of which are newly installed and running). The analysis revealed that, due to the large side of the boiler combustion space, even drainage arrangement, large diameter, tube bundle boiler convective condensation water formed can be discharged. Small smoke tube boiler combustion space levels, due to the structure until the drain can only be arranged at the bottom tube sheet boiler and after the drain of less than 30 mm in diameter, and designed to prevent leakage of boiler flue gas, directly connected to the drain pipe drainage pipes. In operation, the contents of the boiler easy to plug welding slag, rust particles. 2, to adjust the position of the economizer due to the large volume of the boiler, economizer boiler mostly installed in a horizontal tail position, while some horizontal boiler economizer housing is mounted directly or obliquely above the boiler flue outlet, the boiler the lowest point of the flue gas flow. Although the drain pipe installed at the bottom of the economizer, but due to gravity, most of the condenser, condenser and condenser will be returned to the boiler flue. During operation, condensed water after a long period of rinsing, immersed in a heating boiler section. Due to the different materials and material economizer boiler, economizer 09CrCuSb, designed using a material having a strong corrosion resistance, and without considering the design of boiler condensate corrosion conditions, 20g materials, poor corrosion resistance, easily corroded. 3, appropriately increasing the return water temperature in the boiler load or the energy efficiency of the testing process in industrial boilers, most of the boiler has a low load operation. Operated at the design load, the exhaust gas temperature before entering the boiler flue gas economizer is higher than the dew point, in the low load operation, the exhaust gas temperature of the boiler flue gas is lower than the dew point, so in the case of satisfying the condition, as far as possible should be boiler work in the vicinity of the design load, or take action. Measures could be taken to improve the return water temperature of the hot water boiler. For example, in the secondary heating system network, a network should decrease the flow, to increase the temperature of the primary water supply and return pipe network. Thereby raising the temperature of the flue gas leaving the boiler heating surface of the body, to avoid condensation of water vapor in the heating surface of the boiler body. 4, the depth of the condensed water recovered by previously described, the industrial gas boiler condensate is quite large, which is part of the condensed water is not effectively contain some depth using heat, in order to take effective measures to recover heat and water. For example, we may be adjusted by adding an alkaline agent (ammonia, cyclohexane, etc.) pH value of the condensate, which is then pumped into the heating system, which not only saves water, and heat is recovered.
At present, the processes for preparing ultra-pure water in the power boiler feed water system are basically the above three, and the rest of the process flow is mostly derived from different combinations and combinations on the basis of the above three basic process flows. Their advantages and disadvantages are listed below:
1. The first type of ion exchange resin has the advantages of less initial investment and less occupation, but the disadvantage is that it requires frequent ion regeneration, consumes a large amount of acid and alkali, and is destructive to the environment.
2. The second type uses a two-stage reverse osmosis device, which is characterized by a higher initial injection rate than an ion exchange resin method, but does not require resin regeneration. The disadvantage is that the relevant membrane originals need to be cleaned or replaced regularly, and the water quality is relatively not too high, and most of them can only be about 1 us/cm.
3. The third type uses reverse osmosis for pretreatment and is equipped with an electric deionization (EDI) device. This is the most economical and environmentally friendly ultrapure water preparation process for preparing ultrapure water. It does not require regeneration with acid and alkali. It can continuously produce ultrapure water, which is not destructive to the environment. The disadvantage is that the initial investment is too expensive compared to the above two methods.
Steam boiler plant using the process needs to be noted that the use of a use materials for steam boilers equipment problem is extremely widespread, although the product is stable, reliable work. But by no means can say any control. Today we took everyone in detail about those matters need to be aware of when using the steam boiler equipment. First, check carefully before starting the boiler equipment before starting the boiler steam boiler inspection process is particularly important, we need to examine the site there are many, such as fuel gas pressure is appropriate, whether to block the smoke pipe is already open, such as conventional pumps Sheung Shui Wait....... Only conventional support equipment before starting the boiler, steam boiler guarantee reliable gas each work reliably. Secondly, stop using the time to stop using the application is particularly cautious when using the process, first turn fire into small pieces fire, and then carefully put out, close the gas valve. Matters estimated gas steam boiler have reliable use of these two, and if everyone can be a matter of particular concern in the use of these, I believe we can use it very reliable gas steam boiler, to avoid problems caused by improper use.
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