Production of methanol from straw and hay of meadow grasses

Obtaining energy carriers convenient for storage, transportation and use for direct use in the energy sector, or lowenergy-consuming conversion at the point of consumption, into hydrogen fuel is one of the urgent tasks. Nobel Prize winner George Ola and his collaborators have shown that the universal product for large-scale industrial production of hydrogen is methanol, which requires the least energy costs for conversion.

However, the production of methanol from fossil fuels (coal, gas, oil) is accompanied by the emission of greenhouse gas carbon dioxide. This effect can be avoided by using fast-growing plant masses in carbon equilibrium with the biosphere as raw materials for its production (as much carbon dioxide was released during use, the same amount is absorbed during plant growth).

This paper substantiates the possibility of solving this problem with the help of a new technology for obtaining methanol from straw and hay of fast-growing meadow grasses.

A technological complex of installations for the production of methanol from straw and hay of meadow grasses is presented, including: a direct-flow reactor, a heater case with a fluidized bed of dispersed electrocorundum, a wasteheat boiler, an installation for removing excess carbon dioxide from synthesized gas with monoethanolamine and an installation for the production of methanol from synthesis gas and other auxiliary equipment.

The temperature in the reactor is 700 ° C, in the reactor heater is 800 ° C. The output of synthesis gas is 1.529 kg / s, its heat of combustion is 12939 kJ / kg. The share of synthesis gas entering to heat the reactor is 0.332 of the total output, and the production of methanol is 0.668 (1.47 m³ / s).

The power of the steam boiler-utilizer is 2219 kW. The yield of methanol is 0.56 kg / s, its heat of combustion is 20 mJ / kg. For the production of 1 kg of methanol, 1.78 kg of alfalfa is required. Annual consumption of alfalfa 31536 tons, water 16685 tons Annual production of methanol 17660 t. Thermal efficiency (gross) of the process of processing alfalfa into methanol 58%.

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