According to the State Grid, in the context of the “2+26†urban air pollution prevention and control in Beijing, Tianjin and Hebei and surrounding areas this year, as of the end of September, the total number of residents in Beijing, Tianjin and Hebei and surrounding areas “coal to electricity†has totaled 1.75 million. , 5,763 village reconstruction tasks, heating area of ​​more than 100 million square meters. State Grid Beijing Power took the lead in completing the renovation of 405,000 households in 2017 one month ahead of schedule. “State Grid Corporation actively carries out pilot demonstrations, explores new mechanisms, and attempts new technologies, from urban to rural areas, from centralized to decentralized, from residential life to schools, hospitals, enterprises and institutions, and other places to promote the application of electric heating Du Weiwei, deputy director of the marketing department of State Grid Corporation, said. According to the data, as of the end of September, the State Grid Corporation has promoted the implementation of 18,000 clean electric heating projects and promoted the electric heating area of ​​about 500 million square meters. For the intermittent heating places such as primary and secondary schools and various business halls, we will promote the distributed electric heating technology such as carbon crystal and electric heating film according to local conditions, and complete 3,066 projects and 9.54 million square meters of transformation tasks. In conjunction with the government's efforts to ban small coal-fired boilers, in 14 provinces (autonomous regions and municipalities directly under the Central Government) in the northern regions, hospitals, shopping malls, enterprises and institutions, etc., vigorously promote centralized electric heating technology such as electric boilers and heat pumps, and implemented 15,000 projects to promote 430 million square meters to achieve electric heating, replacing 18,000 units, 330,000 tons of steam to warm small boilers. In fact, this is only part of the power replacement project of the State Grid Corporation. Wang Yanfang, deputy director of the State liaison department of the State Grid Corporation, provided such a set of figures: In recent years, the company has implemented a total of 90,000 electric energy substitution projects in five key areas: residential heating, industrial and agricultural production, transportation, power supply and consumption, and household electrification. The rest, the replacement of electricity is nearly 320 billion kWh, equivalent to the electricity consumption in Hebei Province in 2016, reducing the consumption of 130 million tons of standard coal in the energy terminal consumption, reducing carbon dioxide emissions by 320 million tons, reducing emissions of dust, sulfur dioxide, nitrogen oxides The total amount of materials is 100 million tons. According to the plan, during the “13th Five-Year Plan†period, the State Grid Corporation will complete the goal of replacing 580 billion kWh of electricity with electricity. It is worth noting that in the vigorous promotion of clean heating, the issue of cost is of great concern. Xu Zhaoyu, deputy director of the Building Energy and Environmental Monitoring Center of the China Academy of Building Research, calculated the account for the reporter. At present, the central heating price in Beijing is about 30 yuan per square meter, and after the “coal reformâ€, there are national and local subsidies. Now it is about 19 yuan per square meter. Zhang Yuhua, vice chairman of Zhonghui Geothermal Co., Ltd., believes that most of the rural areas are coal and straw burning, and straw is not included in the cost. Now, after the "coal to electricity", the straw actually creates a part of the proceeds. At the same time, the overall "coal to electricity" process can not be across the board, according to the situation of the house itself to give a comprehensive technical transformation program, improve the airtightness of doors and windows, which can reduce energy consumption overall, in addition to heating and distributed solar energy , energy storage, intelligent control and so on.
Forstner Bits
Forstner bits, flat-bottomed to drill holes in wood materials, they can cut on the edge of a block of wood, and can cut overlapping holes; for such applications they are normally used in drill presses or lathes rather than in hand-held electric drills. Because of the flat bottom of the hole, they are useful for drilling through veneer already glued to add an inlay.
The bit includes a center point which guides it throughout the cut (and incidentally spoils the otherwise flat bottom of the hole). The cylindrical cutter around the perimeter shears the wood fibers at the edge of the bore, and also helps guide the bit into the material more precisely.
Forstner bits have radial cutting edges to plane off the material at the bottom of the hole. The bits shown in the images have two radial edges; other designs may have more. Forstner bits have no mechanism to clear chips from the hole, and therefore must be pulled out periodically.
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