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 Wysłany: Pią 22:57, 25 Lut 2011 Temat postu: Moncler jacken Modern large-scale nitrogen liquefa |
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Modern large-scale nitrogen liquefaction process
Set the selected cycle pressure range. Second, we must determine the pre-cooling temperature from the above calculation and analysis we can see, when the pre-cooling temperature from 310 ~ 24oK change, with the pre-cooling temperature decreases, the minimum energy value is decreasing. Therefore, the existing freezer, it should be used as a low evaporation temperature freezer. Of course, performance should be considered good or bad freezers and equipment investment. Pre-cooling temperature and cycle pressure is determined, the final punches expander can be determined from the above analysis we can see that there is an optimal expansion of the value before the temperature can make the minimum energy consumption, high and low temperatures will cause the expansion of the former energy consumption increases. Therefore, energy consumption can be minimum or maximum liquefaction factor as the objective function for multi-program optimizing selection, the use of total nasal machine optimization to determine the parameters of the expander, the expansion of the former temperature, swelling the total 6 14 Luan cooling technology .1 section of the expansion flow parameters such as CVP. Here, we proposed is only a design guide the thinking and methods. In practical design, the situation is much more complicated and should therefore be taken into account various factors. Such as the expander efficiency changes in different situations, such as temperature and compression ratio on the efficiency of the compressor and cooling loss in the insulation under different conditions change and the flow resistance inside the heat exchanger, etc. change. Comparison of multiple programs to determine the best design. Of discussions by the previous analysis, as shown in Figure 1, this process I to come to the following conclusions. 1. Increase the pre-cooling process can greatly improve performance and reduce energy yak. Also, the Court, as the pre-conventional freezer cold source, conditions permitting, pre-cooling temperature should be as low as possible. 2. The temperature is not as low as possible before the expansion, but should be appropriately increased. There is an optimum temperature before the expansion, so that the minimum energy consumption. Pre-cooling temperature is lower, the best lower the temperature before expansion. 3. Cycle high pressure should be greater than the critical pressure of the working fluid cycle, so as to ensure the flow of gas is cooled sufficiently. Must be pointed out that the liquefaction process, the current flow of foreign more sophisticated, such as multi-satin expansion and pre-cooling. But I believe that,[link widoczny dla zalogowanych], according to China's situation, especially liquefaction capacity is not The case of scale, taken with the single-stage pre-cooling, single-maggot cycle of expansion, can simplify the process, machinery and equipment manufacturing is relatively easy. At the same time, this process has a high coefficient and low power consumption of liquefied, so this process is now more appropriate within a reasonable process. In addition, most of this calculation,[link widoczny dla zalogowanych], analysis and discussion are of nitrogen as the working substance, but as long as a little change to be completely applicable to oxygen liquefaction process. References 1 bundle Hu, Shi Ping Shan editor. Zhu Ling dish made of wood at low temperature (Volume) Mechanical Industry Press,[link widoczny dla zalogowanych], 1981,2 R. GGateS. M. J. Andrecov [on. JMars. hallandZ. Q. SunExergeticAnalysisforNitrogenliguefierDeslgn. ProceedingofInternationalConferenceonCryogc-nlcsandReferlgeratlon, 1989.3HubertHauberCycleProeessforCry-ogenicliquidproductionwithoptimizedPOWCTConsumptlonLINDE-HANGYA-NGAirSeparationPlantSymposium, 1987. (June 1989) Hang oxygen plant energy rose by a pre-assessment of the country in 1990 on the morning 89, Hangzhou Factory of the energy-liter oxygen States formally ended a pre-assessment. To review the assessment of plant summary of the work group, announced that Hangzhou Oxygen Plant has basically meet the national standards for energy companies, agreed to the basic through the pre-assessment. Machinery industry,[link widoczny dla zalogowanych], Zhejiang Province, by the 9 companies composed of 11 comrades of the Ministry of national energy level E & M companies pre-evaluation group, the morning of July 11th is the beginning to the Hangzhou Factory for evaluation of oxygen. The pre-assessment through the Electrical and Mechanical Department will conduct a formal review of antioxidant plant acceptance. Director Kim Yun-base in his speech pointed out that a strict scientific approach to seeking truth from facts, get down to doing the actual work to meet the national review, requested use of energy, support each other, getting the job done. ~ excerpts White Pu HangYang Express (GU) j welcome to industries and factories editor can have your factory special report, plant periodicals, bulletins, newsletters, and other information such as dynamic communications, when Brother House training us to report the pick-rI.
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