Method for directly applying large scale non-grid connected wind power to methyl alcohol production

Abstract

The invention relates to a method of directly applying large-scale non-grid-connected wind power to producing methanol. The method mainly uses the large-scale non-grid-connected wind power as a working power supply for electrolyzing equipment, uses oxygen electrolyzed by water as gasifying agent, uses hydrogen electrolyzed by the water to adjust carbon-hydrogen ratio in desulfurized water gas, and uses the water gas with the obtained optimal carbon-hydrogen ratio to prepare the methanol. The method has the advantages of: 1, improving the yield of the methanol greatly, wherein the yield of the methanol in coal unit is doubled; 2, reducing the equipment investment and operating cost of the methanol processing technology greatly, saving energy and reducing consumption; 3, reducing carbon dioxide discharge greatly by more than 92 percent compared with the prior method for producing the methanol; 4, reducing water consumption for producing each ton of the methanol by nearly 40 percent; and 5, accumulating and converting wind energy with instant variability into stable complementing energy or an important chemical raw material, making full use of regenerated wind resources, having little interference to environment and ecology. The method is a full good method for producing the methanol.

Description

technical field [0001] The invention relates to a method for producing methanol, in particular to a method for producing methanol by using large-scale non-grid-connected wind power as the power source of electrolysis equipment, and using hydrogen and oxygen generated by electrolysis of water as important raw materials for production of methanol, which belongs to the field of production of chemical raw materials . Background technique [0002] Energy and the environment are two major themes that countries in the world are concerned about today. According to the analysis of the "International Energy Outlook 2007" (International Energy Outlook 2007) released by the Energy Information Administration of the United States, the world's energy consumption will continue to grow in the next 20 years, and it is estimated that by 2030, the world's The annual energy consumption will be 447×10 in 2004 15 Btu (British thermal unit) increased to 702×10 15 Btu, an increase of 57%. The In...

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Problems solved by technology

[0018] (1) The conversion reaction of carbon monoxide and water vapor needs to occur at 5.5MPa and 320-550°C, so it needs to consume a lot of energy. At the same time, high-pressure operation will greatly increase the fixed asset investment and operation risk of the process;

[0019] (2) In the shift reaction of carbon monoxide and water vapor, a large amount of CO is produced as a by-product 2 , while consuming a large amount of water;

[0020] (3) The decarbonization process of carbon dioxide mainly includes chemical absorption method and physical absorption method, but no matter which method is adopted, it needs to be operated at a pressure of up to 5.0MPa (gauge pressure), and the equipment cost investment is huge

However, due to the instability and fluctuation characteristics of wind power, there are still technical obstacles that are difficult to overcome at this stage when large-scale wind power is connected to the grid. It has become a worldwide problem that the contribution rate of wind power to the grid cannot exceed 10%.

At the same time, the wind power grid puts forward the requirements for wind turbines to meet the grid frequency, voltage and phase stability, which greatly increases the manufacturing cost of wind turbines and the price of wind power, and limits the large-scale application of wind power.

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