The towing tube can be carried out simultaneously with the last hole reaming or separately. Before towing the tube, an anti-corrosion test must be carried out on the anticorrosion of the crossing tube, and it is best to perform dynamic detection when towing the tube. Towing tube sending is also the key in construction, and the appropriate sending method should be selected according to the actual situation. The appropriate reamer and the number of reaming times should be selected according to the geological conditions. The speed should not be too fast during the reaming process, and pay attention to the preparation of mud.
You can put the traversing tube on the special delivery tow tube rack or into the water-filled delivery pit, or use other proven methods to ensure the smooth delivery of the tow tube and the pipeline and anti-corrosion layer are not damaged. The towing process should be stable and slow, and the speed should be uniform, not too fast.
Horizontal directional drilling will be widely used as a highly efficient and safe new technology. Excellent performance equipment, reasonable construction technology, construction organization of gas and thermodynamics and effective construction measures are the main factors for the successful completion of the project. Since horizontal directional drilling technology has not been applied in China for a long time, it is still not perfect in many aspects. It is necessary for us to concentrate our scientific research efforts and learn from foreign mature technology and experience to improve our technology and management and formulate relevant specifications.
At present, China's heating energy consumption per unit building area is equivalent to 23 times that of developed countries with similar climatic conditions. According to expert analysis, it is practical and feasible to fully implement the standard of 50% energy saving in public buildings and residential buildings in China; compared with developed countries, there is still about 50% energy saving potential even after reaching the goal of 50% energy saving.
energy efficiency. Energy efficiency is 10 percentage points lower than the international advanced level. For example, the average efficiency of thermal power units is 33.8%, which is 67% lower than the international advanced level. The intermediate links of energy utilization (processing, conversion, storage and transportation) have large losses and serious waste.
The gap between China's energy use efficiency and foreign countries shows that the potential for energy saving is huge. According to relevant unit research, the energy consumption per unit product and end-use energy consumption equipment is compared with the international advanced level. At present, China's energy saving potential is about 300 million tons of standard coal. The main reasons for China's low energy efficiency are extensive economic growth, irrational structure, backward technology and equipment, and low management level.
First, the structure is unreasonable. The tertiary industry with low energy consumption in the industrial structure (the energy consumption of output value is 43% of the energy consumption of the output value of the second industry), especially the service industry, is obviously lagging behind. The added value of the tertiary industry in China accounts for 33% of GDP, while the world average is about 63%; the proportion of high-energy-consumption and heavy-chemical industries in the secondary industry is high, and industrialization is still dominated by volume expansion, with high consumption, large waste, and heavy pollution; the proportion of high-quality energy in the energy consumption structure is low; the scale of enterprises is small, and the concentration of industry is low . The second is backward technology and equipment. The proportion of backward technology in key industries is still relatively high. For example, the comprehensive energy consumption per ton of steel in large-scale iron and steel enterprises differs from that of small enterprises by about 200 kilograms of standard coal. The coal consumption of thermal power plants of 300,000 kilowatts and 50,000 kilowatts differs by 100 grams per kilowatt hour Above standard coal, the comprehensive energy consumption of large and medium-sized ammonia synthesis products differs from that of small enterprises by about 300 kg of standard coal. Third, the management level is low, the statistics, measurement, and assessment systems closely related to energy conservation are incomplete, the level of informatization is low, and losses and waste are serious.
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