||发布者：zq1229 发布时间：2016-6-30 10:02:40 阅读：1167次 【字体：大 中 小】
Huge liquid air energy storage technology prospects
Keywords: liquid air energy storage technologies, energy security, sustainable energy issues, energy pricing issues
Description: energy storage technology can help solve three difficult problems facing the world: energy security, sustainable energy issues, energy pricing issues. This is a very good idea, but how interconnected across countries, may be the most technically easy, but should rationalize the relationship, the challenge may be political issues, rather than technical problems. Liquid air energy storage technology in the technical maturity, technology can be implemented, with strong competitiveness on cost and economical, great future. The benefits of integrated applications of liquid air energy storage is the other can not match.
The just-concluded Sixth China International Energy Storage Conference (5.24-5.26), Professor at the University of Birmingham Ding Yulong "Recent progress in the commercialization of liquid air energy storage technology," the speech that the energy storage technology can help solve the world faces three difficult issues: energy security, sustainable energy issues, energy pricing issues. This is a very good idea, but how interconnected across countries, may be the most technically easy, but should rationalize the relationship, the challenge may be political issues, rather than technical problems. Liquid air energy storage technology in the technical maturity, technology can be implemented, with strong competitiveness on cost and economical, great future. The benefits of integrated applications of liquid air energy storage is the other can not match.
The following is the Ding Yulong Presentations:
Moderator: Let’s use the warm applause to welcome Mr. Ding Yulong professor of the University of Birmingham, the topic of his speech today is "Recent Advances in commercial liquid air energy storage technology."
Ding Yulong: Thank you very much! Well, today I can actually be used to lecture in English, but I read today’s audience is mainly Chinese audience, so I used to lecture Chinese, foreign friends, please listen to simultaneous interpretation. Most of them are Chinese people, Chinese may be better.
Said the new technology is also not quite new, and this technology is the invention of our team, I want to start a few points. First, the different forms of energy and different forms of application, then the status quo is that we now belong to a lot of energy storage technologies, in principle, the same applications, the situation now is a variety of different technologies in parallel, but very mature technology, other technologies may not say very mature, like 2009, we published an article that cited the number is very high, almost one thousand times the bar. Not the best of technology, only the most suitable technology, which is the first point I want to communicate.
Second, what is the use of energy storage, the storage is not a panacea, can not solve all the problems, then solve some problems of our energy grid, we demand with supply does not match the way, in fact, there are about four types of technology can solve reservoir could be one of them, we have other technologies, even if this energy storage market is still very large. I talk about liquid air energy storage technology with other technologies compare, check with the data here is quite accurate, but I have to say something, say battery technology can be expensive, may 3000 dollars a kilowatt-hour, we’ll leave it different properties of the battery price is not the same, we do not pretend to be, not too much attention to this stuff.
Liquid air technology what it is technology, energy storage technologies, is our machinery, it is not the type of industry, it is a few minutes level, may participate in the secondary leveling.
Here for a historical review. Liquid air energy storage technology is a conventional air separation technology and power transmission and distribution technology integration Maw. It does not require high pressure, need electricity when it hit a high pressure to heat, such as boiling point of 196 degrees, which is a mature technology. What are the characteristics of this technique is that? The market is relatively mature. The liquid air energy storage in the 19th century alone, then the use of liquid air energy storage as a peaking in 1977 in the United Kingdom put forward, these efforts later led the company to do some work, but did not make the demonstration, did not do a whole system. Truly independent technology, this is our team, 2003, 2004, should be raised, of course, there are other companies, like, as well as European companies the United States has also done some work. I was in college to do. Brief historical development, we put forward the concept from 2005, do some small demonstration systems, to do five megawatts now, in fact, just completed this month, probably starting next month, is the case.
It can be said that the technology than on other development probably worse for several years, about the difference between 5--8 years, why write 5--8 years, as long as you have the money to have people vote on you can do, but quickly copy hard. In addition, the pilot plant was built in 2005, which is the pilot plant of the original case, the pilot plant moved to the University of Birmingham, which is its current status. We compare this figure, one inside the school, which adds a thermal storage test, which rely on heat to resolve. This is our full map, which is already under construction, the Manchester, England, the use of part of the waste heat into electricity storage and trading, after the establishment of the plant by a third-party transactions, can provide more specific material.
I want to talk about the second use of the process. The process is slightly more complex, hollow body come true, then compressed and cooled space, and then heated and expanded, and is the product out, there is electricity in, electricity out of the air in, air out, including green, the air Like water, it is more green stuff. In addition, the compression process, generates heat, the heat used to do it? It is the expansion process to increase the rate, in addition to the cold, you put it to very high power generation efficiency can be higher than the general efficiency, this high efficiency. It is this part of the cold also be recovered back. In fact there are heat storage and cold storage, in order to improve the efficiency of the entire system.
So, we summarize the material into the air flow, the air, and the heat and cold out later efficiency is very high, hot and cold regardless of whether it is useless to heat with electricity is common.
The system takes about 60%, is the existing technology, we may feel that this is relatively low, but no matter what kind of storage stream technology, long-scale technology can reach 50% of it to admire a lot of things we do not discuss given the real data, as an application, or the efficiency of the future truly reflected.
Energy, which also SNG, I guess we use from 30 - 50 years of it, so that SNG is not realistic, cost, technology maturity, technical facilities can not be completed in a very short time, 15% into our network, but it not universal, we exchange views with.
Also, I format of storage space technology, I just said range, small, for example, which is based on small-scale energy storage is, but based on carbon dioxide storage technology, we have established this project to the whole system, about 25 kilowatts system, the pressure between about 10-75, this corresponds to a critical state, the carbon dioxide will be dry, because at high pressure, corrosive carbon dioxide, there are some questions that I did not say specifically, and acoustic energy storage It can be used for both large and small, if the pump system, I can do a small distributed system, where do small applications. Further, in addition to these possible applications is peaking, as well as FM.
When it comes to the most innovative, there is no competition, and this has just mentioned, the following is not continued. This pilot plant to move to Birmingham after the completion of this work, has been tested for several months, we may look at the relationship between power output and pressure, and how the regulation is actually a linear relationship, how it is better regulation? We are to transport liquid pump, it is the constant, and the other is to start and stop the process, is not very slow start? What is the speed, the vertical axis represents power output, we can see that the start is relatively fast, give instructions, in little more than two minutes, stop faster. This is the start of the front end view of the instruction to start from there, probably less than 2.5 minutes, starting speed certainly can not be compared with the batteries, but more than compressed air (8-12 minutes) faster. If the frequency changes after primary frequency about 10-30 seconds, you can participate in secondary frequency. Liquid air to run, and then start fast, you can take another FM. This is our energy storage technology in a few years time the experiment, the data for comparison, it can control the accuracy is still relatively high, 99.8%, this is not all technologies are able to meet this standard, track quickly.
In addition, if there is excess heat, such as heat storage Lee speaks, in fact, solar heating systems, solar heating systems with this on a piece may have a better system, especially some low solar heat. We do the experiment, the British sun is not too much, so we used some heat, this figure, we do between 50 degrees from 20 degrees, the heat added, the temperature of air power is to add that, which is equivalent to power generation efficiency of about 45%, so low heat, we have four or five degree heat, why so high? The reason is very simple, you Otsuichi count this efficiency should be 70%, the 45% efficiency is relatively easy, and any other kind of technology is not up to this point.
Now, I want to report that we have an area, people are concerned about this thing is not very big, there are few data, a system is small, about 160 square meters, this system is to demonstrate, in fact, not very tight, another 5 megabytes of system, this is the car park, including the office of the stuff, and we do a 20 MB / 80 MW, this is a project with a uS energy company to do, about 6,000 square meters, there are a few people Bibi heart , different systems, including batteries, covers an area of great competition.
In addition, the cost, I think the first set of the cost is very high, a technology is not mature before any costs are very high. To assess the first set with a tenth Price much worse, with 20 MW 80 MW system, probably can be done per kilowatt to $ 640, it is the investment, if kilowatt count, more than 600 US dollars per kilowatt, we see this Figure must consider two parameters, one is about how much power, how many kilowatts and megawatts, the second you how much storage capacity, these two should not be confused.
Therefore, increasing the size, cost reduction, this is no doubt, I will stay for a picture you know. About one-third of the cost, and not only in our system, there are many others in this situation. We did an assessment, how much you sell the equivalent of electricity, you can make money, we do a comparison, in this liquid air energy storage, the battery should be done very large, little or no real need for this, If, as energy applications, as I have said, I do not think liquid air form is to degrade them, it may double the difference may also, known as 50%, then a number of other techniques may also be such that only a relative data, then the following some of the data, this is our liquid air energy storage system, the first set of pilot plant really expensive, about ten thousand dollars per kilowatt, which is our price, this thing done for several years, I have a light run factories ran several times, but also a lot cheaper second system, a system designed to reduce the back lot, just the surface of the data I also tell you is that the efficiency is the first set of system efficiency is about 10% of this data we may feel too low, but I think the data has been very good, because it belongs to a large-scale, small scale certainly does not work, then the second system should be about 50%, then the following set of basic system efficiency of about 60%, further increase there may be some differences in high humidity areas, such as the high cost of some of the South, the reason is very simple, we should remove the water from the air inside, the cost of energy is needed, how much you need to water evaporation, air north little water content.
In addition, the liquid air energy storage technology and other technologies to make some comparison, spend a minute or so. The most mature is two, one is compressed air energy storage, one is the pumped storage, compressed air energy storage is not to do this, so on the inside thermal storage, compressed air energy storage require large gas storage cavern.
I think the table is more objective, and this thing, these data should be a relatively wide. Compressed air two cases, one is the compression norm storage, it is more mature, has been used for decades in the United States, probably in the 40-50% efficiency, this technology heat recovery, there is no a large-scale demonstration, under development, in fact, this technology is not yet mature, such as compressed air, this has been out for several years, these data are more objective. In addition, the costs involved, this type of cost, chart, just do not know, about 10 cents.
Let me give two examples. These liquid air energy storage and nuclear power integration may liquid air energy storage integration, partly liquid air energy storage, here is the degree with two back three times to do some of the stored energy, the heat out, then the investment only removing 30% of the battery is about 50%, this is the order of magnitude, it may be 10%, which is something I would like to share. This thing, the battery is reached this result, liquid air can not do, can not do the pumping.
The following conclusions. First, the storage technology that can help us solve the world is facing three difficult issues, energy security, sustainable energy issues, the price of energy. From Finland’s comrades say, this is a very good idea, but how interconnected between different countries, the most critical is that some may be the most technically easy, but should rationalize the relationship, it may be a political issue, not a technical problem. The second is a liquid air energy storage technology in the technical maturity, technology can be implemented with rape competitive cost and economical, and great future. The benefits of integrated applications of liquid air energy storage is the other can not match.
Thank you all! This is a map of our school, it is quite beautiful, the campus should be the top few in the world. Thank you all!
Moderator: Thank you Ding. We can ask questions.
Question: What technical difficulties?
Ding Yulong: It requires integration technology, the efficiency of how the system needs to be optimized to it, including the optimization of the cost, which is the most important of this compressor, especially a compressor, then what kind of range you selected.
Question: You mentioned this is the economy, mainly economic, technical difficulties in addition to what?
Ding Yulong: Other Needless to say, the development of other new technologies.
Question: Because users should be concerned about both its technology but also concerned about the cost of its investment, technology is not high threshold, to achieve good investment demand.
Ding Yulong: Yes, we all know that technology and cost, basically designed with our traditional power generation systems not be too far, as well as air separation, the key is how do you merge two technologies.
Question: That’s OK, thank you!
Question: Ding, I would like to ask, just this report which introduces thermal energy storage is relatively small, such as with the use of molten salt thermal storage What is the difference?
Ding Yulong: in storage areas should be will be relatively large development, why do you say, about 60% of heat and cold, I think as far as heat and cold storage, my basic judgments, the cost is relatively low, such as battery storage electric, probably in 3000 dollars, with heat storage, then there are different techniques, cost probably between 30-60 yuan / per kilowatt hour, of course, some low temperature part, this cost should be a lot of its advantages, its life expectancy long, you use about 30 years there is no doubt. A lot of people will say, electrical energy into thermal stability will everywhere, but the next hot trend is unstoppable, the current situation may not have a second choice or better choices, either with gas, which is the European and American experience, especially to solve the haze problem, the coal in the energy mix minus 20%, will not be a big problem, I think it is this. So, to solve this problem, our country is not so much gas, but also unstable, electricity is the best, this year is more severe here not for the storage reservoir, in fact, we can not solve the energy storage battery is satisfied pin problem , the cost can not be a heat storage time, such as 20 a few dollars, there is a country in which subsidies or subsidies more or less subsidized, but you can not exceed the money, people very realistic. Your price is higher than before people quit, so I think there is a concept of the electricity into heat, from practical use, the power to become hot, lift up the technology, but we do not have the space to invest, this is not my expert speech, unless you increase its power. So there is the need for a comprehensive solution, I do not know if I have a good answer to the problem.