The new direction of straw power generation

The new direction of straw power generation

During the wheat harvest season, the smoke in the Central Plains region of China is as usual. Burning straw, while polluting the environment, also consumes a lot of energy. The straw power generation is a “win-win” industry that benefits farmers, society, and enterprises. Experts from Denmark's BWE, a company with established technologies, companies, and experience who are known for clean energy production, once encountered a lot of straw in the fields of Hebei Province. They were very puzzled: Why are so many bioenergy wastes? - The resulting environmental pollution is also painful! The 1973 oil crisis prompted Denmark to start a postgraduate material-energy straw power generation technology. Under the technical support of BWE, the world’s first straw biomass combustion power plant was born in 1988. Currently, there are 130 straw power plants throughout Denmark. Renewable energy such as straw power generation accounts for more than 24% of the country's energy consumption. Denmark has become an oil exporter from an oil-importing country by emerging alternative energy sources. With the gradual reduction of one-off energy sources in the world and people's demand for further environmental quality, the development of new and renewable energy sources is on the rise in developed countries. Currently in Denmark, the Netherlands, Sweden, Finland and other European countries, there are more than 300 units that use plant stalks as fuel for power generation, and their social and economic benefits are very good. An annual output of 200 million tons of straw can be used to replace at least 100 million tons of coal by burning straw, which is technically feasible. In some places in southern China, sugar cane bagasse has been used to generate electricity. There has been precedent. Some technical personnel of special boiler plants have confirmed after verification that they only need to slightly retrofit the existing furnaces of such power plants, and then increase the feeding and bag type dust removal devices. After replacing part of the coal with straw as fuel, the stable and normal operation of the generator set will not be affected. At the same time, the power plant will not increase pollution after blending with straw. When dealing with straw in a centralized manner, as long as the technology is handled properly, it will not only have no impact on the environment, but will also improve the environment as a whole. According to experts, crop straw is a good clean renewable energy source. The calorific value per two ton of straw is equivalent to one ton of coal, and its average sulphur content is only 3.8‰, which is far lower than 1% of coal. The average sulfur content. At present, the annual output of crop straw in China is about 660 million tons, and nearly 200 million tons of straw can be used for energy purposes. It can replace at least 100 million tons of coal at least, equivalent to a year's coal production capacity in the coal province of Henan. If the proportion of renewable energy such as straw power generation in China can reach the advanced level in foreign countries, the situation of shortage of coal will be effectively alleviated, and the rolling smoke that covers the northern fields will also be wiped out. Three obstacles have become obstacles. At present, foreign countries have used straw to generate electricity and have a relatively mature technology. Danish BWE is also actively working on building large-scale straw power plants in China. However, experts believe that the introduction of foreign companies' core technology and large-scale equipment are expensive. In contrast, the transformation of existing thermal power plants into coal and straw “double eating” is more effective and has more practical significance and promotion. Henan Electric Power Industry Association found through investigation that in the past, thermal power plants were not interested in this type of technological transformation. There are three main reasons: First, there is no ready-made technical equipment in the country; secondly, coal prices are low, and coal is convenient. There is no The shortage of crops is the top priority; Third, crop straw is a "centralized harvest, annual consumption and utilization," and there is a problem of unbalanced storage and supply. According to experts, these concerns can be properly resolved. Resource advantages and cost advantages will increasingly highlight coal as a one-time energy source, with a ton less than one ton. However, the shortage of electricity for coal-based electricity in China will continue for some time, and coal-fired electricity shortages will likely exist for a long time. China's crops such as wheat, corn, and cotton have large acreage and high yields, and crops are renewable resources. Compared to the embarrassing situation of frequent coal-fired power plants and unaffordable coal prices, the promotion of straw power generation is inexhaustible. The advantages of resources and low cost advantages. As for the issue of storage and balanced supply, it can be solved by establishing and improving the comprehensive management of straw utilization and circulation. A reasonable straw acquisition and utilization policy can be formulated to study the establishment of straw collection, storage and transportation management policies and mechanisms to ensure the quantity and quality of straw, and to promote the straw itself to form a stable development industry. Coupling effect: Rescuing local small thermal power plants correspondingly increasing farmers' income The pollution from burning litter will no longer appear. According to incomplete statistics, there are more than 130 coal-fired power plants with an installed capacity of 55,000 kilowatts or less in Henan Province, with a total installed capacity of more than 5.5 million kilowatts. In addition, there are 116 small thermal power plants with a capacity of 5.09 million kilowatts that do not participate in the unified adjustment of more than 6000 kilowatts. This accounted for only 1/4 of the total installed capacity in the province. In recent years, in the case of power shortage and a long construction period for new large-scale thermal power units, small thermal power plants have played a significant role in relieving power shortages and developing local economies. This aspect has indeed made up for the gap in electricity and has stimulated local economy and employment. On the other hand, due to its “congenitally deficient” aspects such as high coal consumption and large pollution, it will be a great deal for many small thermal power plants built to go from here. problem. If it is no longer competing with large power plants, instead of using locally sourced materials to generate electricity from straw, the mode of operation and operation of small thermal power plants will undergo a major transformation, and will enter the allowable range of national industrial policies, and will be built after a recent boom in power supply construction. The small thermal power plant will find a better way out. According to Henan Electric Power Company's estimation, if the small thermal power plant is reconstructed and mixed with straw, according to the usage calculation, the straw within the radius of 20 kilometers of the power plant can be recycled, which can basically solve the straw problem in most of the counties. Increasing the income of farmers and further mobilizing the enthusiasm of farmers for planting crops will have a long-term impact.

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