ECOLOGICAL SEQUESTRATION OF CARBON DIOXIDE/INCREASE OF BIO-ENERGY OBTAINABLE THROUGH BIOMASS

Abstract

According to known methods, biomass is broken down under the action of water vapour via a carbon monoxide-hydrogen mixture (called synthesis gas) as an intermediate stage into hydrogen and carbon dioxide instead of being combusted directly to generate energy. Carbon dioxide is stored/sequestered and the hydrogen is used to generate energy. The transfer of bio-activity can also be effected within the same process by breaking down a mixture of biomass and fossil fuel (e.g. wood and coal) into carbon dioxide and hydrogen. The hydrogen is then reacted with half of the formed carbon dioxide to form methane and the remaining carbon dioxide is stored. The stored carbon dioxide and generated methane respectively comprise one half each of biological and fossil carbon. If the bio-activity of the stored biocarbon dioxide is transferred to the fossil carbon in methane, a corresponding mixture of wood and coal produces 100% biomethane. Here, too, up to 100% biomethane can be obtained from coal-wood mixtures. By adding the hydrogen obtained from excess electrical energy to the biocarbon, the bio-energy based on the biomass used is even quadrupled. For a traceable eco-balance with such mixtures, it is important to quantify the bio-proportion in the two end products stored carbon dioxide and generated methane. For this purpose, use is made e.g. of the radiocarbon (C14) method.

Claims

1. A process for transporting and steadying or storing renewable energy, the process comprising: converting biomass to bio carbon dioxide and bio hydrogen; reacting the bio hydrogen with synthesis gas obtained from biomass to form bio methane; supplying the bio methane into a network of natural gas; and transporting or storing and consuming the bio methane together with the natural gas.

2. The process according to claim 1, wherein the bio carbon dioxide is stored and reacted with hydrogen, made from electric power by water-electrolysis, to form methane, and the methane is supplied to the network of the natural gas and transported or stored and consumed together with the natural gas.

3. A process for transporting and steadying or storing renewable energy, the process comprising: converting biomass to bio hydrogen and bio carbon dioxide; reacting the bio hydrogen with a part of the bio carbon dioxide to form bio methane; supplying the bio methane into a network of natural gas; and transporting or storing and consuming the bio methane together with the natural gas.

4. The process according to claim 3, wherein the part of the bio carbon dioxide which is not reacted with the bio hydrogen is stored, and the stored part of the bio carbon dioxide is reacted with hydrogen made from electric power by water electrolysis to form the bio methane.

5. A process for transporting and steadying or storing renewable energy, the process comprising: converting biomass to bio hydrogen and bio carbon dioxide; using the bio hydrogen for power generation; storing and reacting the bio carbon dioxide with hydrogen obtained by water electrolysis from electric energy to form bio methane; supplying the bio methane into a network of natural gas; and transporting or storing and consuming the bio methane together with the natural gas.

6. The process according to claim 5, wherein the bio methane is converted to bio hydrogen and bio carbon dioxide.

7. The process according to claim 5, wherein the transported or stored bio methane, or an equivalent amount of the natural gas, is converted to electrical energy.

8. The process according to claim 5, wherein the transported or stored bio methane, or an equivalent amount of the natural gas, is consumed by reforming the bio methane to hydrogen and carbon dioxide, and the hydrogen from the reforming is used for power generation and the carbon dioxide from the reforming is stored.

9. The process according to claim 1, wherein the biomass is mixed with fossil carbon compounds or coal.

10. The process according to claim 1, wherein the bio hydrogen and the bio carbon dioxide are obtained from sugar or cellulose.

11. The process according to claim 3, wherein the bio hydrogen and the bio carbon dioxide are obtained from sugar or cellulose.

12. The process according to claim 5, wherein the bio hydrogen and the bio carbon dioxide are obtained from sugar or cellulose.

13. The process according to claim 1, wherein the bio hydrogen and the bio carbon dioxide are obtained from bio alcohol.

14. The process according to claim 3, wherein the bio hydrogen and the bio carbon dioxide are obtained from bio alcohol.

15. The process according to claim 5, wherein the bio hydrogen and the bio carbon dioxide are obtained from bio alcohol.

16. The process according to claim 1, wherein the bio hydrogen and the bio carbon dioxide are obtained from oil or wax.

17. The process according to claim 3, wherein the bio hydrogen and the bio carbon dioxide are obtained from oil or wax.

18. The process according to claim 5, wherein the bio hydrogen and the bio carbon dioxide are obtained from oil or wax.

19. The process according to claim 1, wherein the bio hydrogen and the bio carbon dioxide are obtained from agricultural or forestry products including at least one of wheat, corn, grass and wood, or are obtained from agricultural or forestry waste products.

20. The process according to claim 3, wherein the bio hydrogen and the bio carbon dioxide are obtained from agricultural or forestry products including at least one of wheat, corn, grass and wood, or are obtained from agricultural or forestry waste products.

21. The process according to claim 5, wherein the bio hydrogen and the bio carbon dioxide are obtained from agricultural or forestry products including at least one of wheat, corn, grass and wood, or are obtained from agricultural or forestry waste products.

22. The process according to claim 1, wherein the stored or transported bio methane is converted to electrical energy by combustion in a power station, the oxygen from the water-electrolysis is used for the combustion instead of air, and flue gases consisting of carbon dioxide and water, are separated, and the carbon dioxide is stored.

23. The process according to claim 3, wherein the stored or transported bio methane is converted to electrical energy by combustion in a power station, the oxygen from the water-electrolysis is used for the combustion instead of air, and flue gases consisting of carbon dioxide and water, are separated, and the carbon dioxide is stored.

24. The process according to claim 5, wherein the stored or transported bio methane is converted to electrical energy by combustion in a power station, the oxygen from the water-electrolysis is used for the combustion instead of air, and flue gases consisting of carbon dioxide and water, are separated, and the carbon dioxide is stored.

25. The process according to claim 3, wherein the bio hydrogen and the bio carbon dioxide are formed with the bio methane, the bio hydrogen is converted into energy, the bio carbon dioxide is stored, the stored bio carbon dioxide is converted to the bio methane with hydrogen obtained from electric wind or solar energy, the bio methane is supplied into the network of the natural gas, the carbon dioxide is recovered from the atmosphere, and the biomass is converted to energy combined with the recovered carbon dioxide from the atmosphere.

26. The process according to claim 5, wherein the bio hydrogen and the bio carbon dioxide are formed with the bio methane, the bio hydrogen is converted into energy, the bio carbon dioxide is stored, the stored bio carbon dioxide is converted to the bio methane with hydrogen obtained from electric wind or solar energy, the bio methane is supplied into the network of the natural gas, the carbon dioxide is recovered from the atmosphere, and the biomass is converted to energy combined with the recovered carbon dioxide from the atmosphere.

Description

DESCRIPTION OF THE STARTING MATERIALS

[0088] All variants of biomass may serve as the starting materials according to the invention. Preferably, these are plants that convert carbon dioxide to organic carbon compounds and oxygen by means of chlorophyll. These plants may grow on the land, in the waters, and in the sea. Plants are preferred because they contain little nitrogen, phosphorus and sulfur, in contrast to zoological biomass.

[0089] These basic materials may also be refined for use according to the invention. Thus, for example, ears may be threshed, and the cereals and straw may be processed separately. The same applies to maize. The refining may go even further, and the oil may be pressed from oil seeds and used separately. Or the by products/waste products of oil production are used according to the invention.

[0090] The biochemical refining products of biomass, such as biogas and bioethanol, deserve consideration. It is true that both can be simply reacted as gases in the reformer to hydrogen and CO.sub.2, and the CO.sub.2 formed can be sequestered. However, part of the CO.sub.2 has already been formed and released into the atmosphere during the production thereof from biomass. With biogas, it is also possible to separate off methane, feed it into the gas network, and then use the same amount of natural gas according to the invention.

[0091] The use of whole plants or plant parts, which are then further processed in a comminuted form, is particularly economical. There may also be mentioned: Agricultural and silvicultural waste materials. In general, organic products of the waste industry may be included.

[0092] With many materials according to the invention, the economical efficiency of the process can be improved by the inclusion of high-energy fossil fuels. Seasonal supply bottlenecks, for example, with annual plants, can also be equalized by such additions. Thus, for example, it may be advantageous to improve the hydrogen yield by adding coal when municipal green waste is used. This is ecologically safe because CO.sub.2 emission is excluded in the processes described. Under favorable conditions, the use of coal together with biomass in this process is more economical than the separate combustion of coal with the technically complicated and thermodynamically inefficient subsequent separation of the CO.sub.2 from the flue gases and the subsequent sequestering thereof. In the process according to the invention, the CO.sub.2 can be directly sequestered after the separation of hydrogen. In the coprocessing with coal, wood and wood-like materials are preferred.

[0093] Decomposition of the Biomass into Hydrogen and Carbon Dioxide:

[0094] All known chemical processes in which biomass reacts to hydrogen and CO.sub.2 using heat and pressure with the addition of steam are preferred. If the starting materials are in the form of liquids or gases, a steam reformer can be used for the purpose. Solid materials are reacted in a fluidized bed process as with coal gasification.

[0095] The process is two-stage, as shown for the model methane (CH.sub.4, biogas): In the first stage, methane reacts with 1 mole of water to 3 moles of hydrogen (H.sub.2) and one mole of carbon monoxide (CO). In the second stage, CO reacts with water to CO.sub.2 and H.sub.2. Thus, 4 moles of H.sub.2 and 1 mole of CO.sub.2 is formed per mole of CH.sub.4. Similarly, the reaction equations for other classes of biochemical compounds can be developed. With them, the reactions also take a two-stage course. If carbon is reacted with steam, a mixture of carbon monoxide and hydrogen is formed in the first stage. This mixture is called synthesis gas. The Chapters Synthesis gas, production and use and Synthesis gas/conversion to electricity/storage of carbon dioxide predominantly relate to synthesis gas from coal, but also essentially apply to synthesis gas from coal/wood mixtures.

[0096] When non-pretreated biomass, such as wood, or whole plants are used, a solid residue that is a suitable fertilizer in agriculture is formed in addition to the gases.

[0097] Separating, Introducing and Processing the Gases:

[0098] At first, gases containing sulfur and nitrogen, if any, should be separated off. Then, hydrogen and carbon dioxide are separated by technically established processes, for example, by utilizing the different boiling points. Now, the hydrogen can be supplied to the power and heat production, and the CO.sub.2 can be sequestered. However, only hydrogen may be separated, and all the remaining gases may be sequestered.

[0099] According to the invention, it is also possible to introduce the separated hydrogen into a natural gas deposit, and to extract/displace the natural gas. For this purpose, it is appropriate to introduce the hydrogen, which is lightweight, into the top part of the deposit, and to withdraw the natural gas from the lower part. As mentioned above, because of the great physical and combustion-technological differences, it is appropriate to keep the two gases separated, if possible, over an extended time of extracting/displacing.

[0100] However, it may also be appropriate to introduce the hydrogen in such a way that mixing of the gases occurs. Also, the hydrogen may be introduced into a deposit while natural gas is still being extracted, for example, in order to maintain a desired extraction pressure in the deposit. If required, the hydrogen may also be directly fed into the gas network or into a particular natural gas line.

[0101] Then, if gas mixtures are present during the extraction and transport, they are varying in quality, because the hydrogen does not uniformly distribute in the deposit and in the pipe system, and therefore, a fluctuating gas mixture is extracted. In this gas mixture, either the hydrogen can be separated off according to usual processes and recirculated into a deposit for further displacement, or the gas mixture is standardized by adding hydrogen or natural gas later according to need. As a third possibility, the fluctuating gas mixture can be supplied to the consumer, wherein the hydrogen content/calorific value must be determined at the site of consumption, and the gas dosage (and the determination of the value) must be adapted to the calorific value. Because of the high expenditure in equipment, it is recommendable to use fluctuating gas mixtures preferably at sites of large consumption, such as in gas power plants, and preferably to feed it there, not in the gas network, but in selected pipelines. When the deposit is charged with hydrogen, the sequestering of CO.sub.2 can begin.

[0102] The following Chapters, especially those that relate to reactions and plants, predominantly describe the recovery of methane with fossil carbon (hybrid methane), but similarly apply to the recovery of biomethane:

[0103] Survey of the Chemical Reaction Equations (Reaction 1. To Reaction 5.)

C+H.sub.2O.fwdarw.CO+H.sub.2Reaction 1.)

(CO+H.sub.2)+2H.sub.2.fwdarw.CH.sub.4+H.sub.2OReaction 2.)

2H.sub.2O.fwdarw.2H.sub.2+O.sub.2Reaction 3.)

CO+H.sub.2+O.sub.2.fwdarw.CO.sub.2+H.sub.2OReaction 4.)

CH.sub.4+2O.sub.2.fwdarw.CO.sub.2+2H.sub.2OReaction 5.)

CO.sub.2+4H.sub.2.fwdarw.CH.sub.4+2H.sub.2OReaction 6.)

[0104] Survey of the Individual Plants of the Hybrid Storage Power Plant (in Parentheses: The Above Reactions Reaction 1. To Reaction 5. That Belong to the Respective Plant)

[0105] 1. Power plant/gas power plant (Reaction 4. and/or Reaction 5.)

[0106] 2. Plant for coal gasification and production of the synthesis gas (Reaction 1.)

[0107] 3. Electrolysis device and rectifier for conversion of electric power to hydrogen (Reaction 3.)

[0108] 4. Plant for the hydrogenation of carbon monoxide (or carbon dioxide) to hybrid methane (Reactions 5. and 6.)

[0109] 5. Connection to the high voltage grid and transformer (Reactions 4./5. or Reaction 3.)

[0110] 6. Connection to the natural gas network (Reaction 5. or Reaction 2.)

[0111] Storage Facilities and Storage Media

[0112] The most important storage facility is the gas network with hybrid methane as the storage medium. When needed, the stored hybrid methane or its equivalent of natural gas present in the gas network can then be reconverted to electricity. This reconversion to electricity is preferably effected in a gas power plant assigned to the hybrid storage power plant. The synergies occurring in this combination of plants are described in some detail above. However, the reconversion to electricity may also be effected in a more distant place, where the hybrid methane or its equivalents of natural gas are then withdrawn from the gas network.

[0113] The carbon dioxide may also be separated from the flue gases and stored or sequestered. If oxygen from the electrolysis of water is employed instead of air in the combustion, the carbon dioxide will remain as a gas after the condensation of water. If the carbon dioxide is also liquefied under pressure, carbon monoxide, which is unavoidable in coal combustion, remains and can be recirculated into the burner, so that it is not released into the environment.

[0114] Another storage medium is the feeding water for electrolysis, which is obtained as condensation water from the flue gases of the gas power plant or plants. If the gas power plant is connected with the hybrid storage power plant, the feeding water can be collected on-site, processed and stored in the tank with a corresponding capacity. From more remote gas power plants, the condensation water collected there would have to be transported to the hybrid storage power plant in tank trucks. In this case, condensates from condensing boilers could also be included in these transports. The invention relates to the collection and storage of the condensate from the natural gas/hybrid gas combustion, because the recovery of hybrid methane from synthesis gas is enabled as the quantity increases (Reactions 2., 3., and 5.). Because of its higher purity, the condensate from the combustion of natural gas is to be preferred over the condensate from the combustion of synthesis gas derived from coal, to be used for the electrolysis of water according to the invention.

[0115] Synthesis Gas/Production and Use

[0116] In the first stage of the Fischer-Tropsch process, the synthesis gas is formed from carbon and water vapor at high temperatures (Reaction 1.). Depending on the quality of the coal or the carbon compound, it contains carbon monoxide and hydrogen as a main component, and possibly methane. It is also possible to heat the coal with exclusion of air to 1000 C. to 1300 C. to obtain coke, i.e., purer carbon, which is reacted to synthesis gas. In addition, per about one ton of coal, there is obtained about 300 cubic meters of coal gas, a gas mixture with about 50% hydrogen and 30% methane as main components, which can be directly fed into the gas network or into Reaction 2. As another by-product of the coking of coal, the so-called coal tar is obtained, a mixture of aromatics. Historically, coal tar has been the starting point of the chemical industry. If the ecological ban is taken from coal with the process according to the invention, many chemical intermediates can again be recovered in the coal utilization according to the invention, and the dependency of chemistry on petrochemistry is reduced.

[0117] In both cases, the production of the synthesis gas, which includes its purification, is a complex continuously proceeding process in which constantly repeated starting and stopping in the changing operational stages of the storage power plant is prohibited. Therefore, it is a particular subject matter of the present invention that the synthesis gas is employed in different uses in both operational stages (in the first operational stage: according to Reaction 3., and in the second operational stage: according to Reaction 4.).

[0118] If the hybrid storage power plant is provided close to a coal power plant, the synthesis gas can also be blown into the combustion site of the coal power plant in the second operational stage, and thus converted to electricity. With an additional gaseous fuel, a higher power for peaks in demand is available essentially more quickly. Thus, flexibility is gained even with a coal power plant.

[0119] The conversion of the synthesis gas to hybrid methane (Reaction 2.) is effected in a reaction named after the chemist Sabatier, in which carbon monoxide is hydrogenated with hydrogen to methane on nickel or iron catalysts. The chemical reaction is exothermic and can be utilized thermally when the process according to the invention is refined, whereby the efficiency of the reconversion to electricity can be enhanced further.

[0120] When the reaction control in Reaction 3 is changed, long-chained hydrocarbons, which are suitable as fuels for motor vehicles, may also be obtained.

[0121] Synthesis Gas/Conversion to Electricity/Storage of Carbon Dioxide

[0122] Conversion to electricity of the synthesis gas means its direct or indirect thermal utilization for the purpose of producing electric power.

[0123] The carbon dioxide formed in the operational stage of conversion to electricity of the synthesis gas can also be stored/sequestered. For example, after the condensation of the water formed from the hydrogen during combustion, the carbon dioxide is separated from the flue gases by liquefaction under pressure. If the oxygen formed in the electrolysis of water is used for combustion instead of air, carbon dioxide is the only gas that remains after the condensation of water, which can be stored directly.

[0124] In the conversion to electricity of the synthesis gas, in addition to directly burning it, it is also possible to convert the carbon monoxide with steam to carbon dioxide and further hydrogen. Then, the carbon dioxide is stored, and subsequently, hydrogen is burnt exclusively. This hydrogen may also be methanized in the same way as hydrogen obtained from electrolysis. This is effected by reacting hydrogen with either stored carbon dioxide (Reaction 6.) or with synthesis gas/carbon monoxide (Reaction 2.). To the latter, the synthesis gas can be divided, wherein part thereof reacts to completion as above to hydrogen and carbon dioxide, and the remaining part of the synthesis gas then reacts with hydrogen to methane (Reaction 2.). Methane is also formed in the operational stage of conversion to electricity of the synthesis gas, which methane can also be stored alternatively for direct combustion/conversion to electricity.

[0125] To conclude, the synthesis gas can be converted to electricity/burnt as such, as hydrogen, or as methane. In all three variants, the carbon dioxide can be separated off and stored as described above.

[0126] The conversion of the synthesis gas to methane, even in the operational stage in which it should otherwise be converted to electricity, is recommendable if electric power is not needed in the place of the hybrid storage power plant, and cannot be conducted away either.

[0127] If the synthesis gas is obtained from biomass (e.g., wood) in the process according to the invention, the carbon dioxide that the plants withdrew from the atmosphere is stored in the soil in the sequestering in the operational stage of conversion to electricity, and biomethane is produced in the operational stage of storing excess energy.

[0128] Detection of the Bio Fraction in the Gases Carbon Dioxide and Methane

[0129] The gases carbon dioxide and methane formed as the end phase are either charged with fees or financially supported (e.g., biomethane), depending on their origin (biological or fossil). Therefore, it is important to determine the bio fraction in the above mentioned gases if, for example, varying proportions of wood are gasified with coal according to the invention.

[0130] This can be done by the radiocarbon method (C14 method) known from archaeology. In this method, it is considered that the biomass employed and thus the produced biomethane have the initial value with respect to the C14 isotope proportion, while fossil carbon contains no C14. The same applies to carbon dioxide. The measurement can be effected on the gases according to the so-called Libby counter tube method.

[0131] Electrochemical Model Calculation for the Production of Hybrid Methane from (Excess) Electric Power and Coal:

[0132] Starting with Reaction 3 (electrolysis of water), 4.2 kW is required for one cubic meter of hydrogen (H.sub.2) for an assumed efficiency of the electrolysis of 80%. According to Reaction 2, another 2 moles of hydrogen (H.sub.2) is required for the production of hybrid methane from carbon monoxide, in addition to the hydrogen of the synthesis gas. Therefrom, it follows that about 8.4 kW of electric power is required per cubic meter of hybrid methane (CH.sub.4) produced from synthesis gas.

[0133] It is assumed that the carbon for the hybrid methane is obtained from coal. Methane consists of 75% carbon (molecular weight of methane: 16, atomic weight of carbon: 12). The gas density of methane is at 718 g/cubic meters. It can be calculated therefrom that 1 cubic meter of methane contains 539 g of carbon. With a carbon content of coal of from 65% to 90% (depending on the quality of the coal), from 580 g to 830 g of coal is required per cubic meter of hybrid methane.

[0134] In summary, 8.4 kW of (excess) electric power and from 580 g to 830 g of (dry) coal yield one cubic meter of hybrid methane, which is comparable with natural gas of H quality. Reconverted to electricity, a cubic meter of hybrid methane would yield 7.5 kW (energy content of hybrid methane: 11.5 kW/efficiency of the gas power plant: 65%). If the use of the coal (580 g) is left unconsidered, the efficiency of the reconversion to electricity is 87%.

[0135] Chemical Compounds/Mass/Volume//Energy

[0136] Reactions

C+H.sub.2O.fwdarw.(CO+H.sub.2)Reaction 1

(CO+H.sub.2)+2H.sub.2.fwdarw.CH.sub.4+H.sub.2OReaction 2

2H.sub.2O.fwdarw.O.sub.2+2H.sub.2Reaction 3

(CO+H.sub.2)+O.sub.2.fwdarw.CO.sub.2+H.sub.2OReaction 4

CH.sub.4+2O.sub.2.fwdarw.CO.sub.2+2H.sub.2OReaction 5

CO.sub.2+4H.sub.2.fwdarw.CH.sub.4+2H.sub.2OReaction 6

CO+H.sub.2O.fwdarw.CO.sub.2+H.sub.2Reaction 7

1. Approach:

[0137] 60 t of bio-carbon (=120 t of wood)+60 t of fossil carbon (=80 t of coal)

[0138] In the above mentioned reactions, 60 tons of carbon yields about 120,000 cubic meters of CO.sub.2, CO or CH.sub.4 gas. Multiples for H.sub.2, O.sub.2 and H.sub.2O vapor then result from the respective reactions. (All numerical values are coarsely rounded/note: (CO+H.sub.2) in Reactions 1, 2 and 4 is synthesis gas.)

[0139] Doubling of Bioenergy:

[0140] The successive reactions Reaction 1 and Reaction 7 yield 240,000 cubic meters of CO.sub.2 (equal shares of biological and fossil CO.sub.2) and 480,000 cubic meters of H.sub.2. With half of the CO.sub.2 according to Reaction 6, H.sub.2 yields 120,000 cubic meters of CH.sub.4.

TABLE-US-00001 Bal- ance: sequestered CO.sub.2 methane produced: 60,000 cbm biol. CO.sub.2-bioactivity.fwdarw. 60,000 cbm fossil CH.sub.4 60,000 cbm fossil CO.sub.2 60,000 cbm biol. CH.sub.4 120,000 cbm biomethane

[0141] The same balance is obtained if, after Reaction 1, the synthesis gas is divided, half of the CO in the synthesis gas reacts to CO.sub.2 and additional H.sub.2 according to Reaction 7, CO.sub.2 is sequestered, and 2H.sub.2 reacts with the other half of the synthesis gas to CH.sub.4 and H.sub.2O according to Reaction 2.

[0142] 120,000 cubic meters of methane/natural gas, converted to electricity in a G+D power plant, yields about 800,000 kW of ecological power.

[0143] Threefold to Fourfold Bioenergy:

[0144] In a storage power plant, half of the synthesis gas is converted to electricity in a gas power plant in the first operational stage to obtain about 400,000 kW in a CO.sub.2-free manner. The CO.sub.2, which consists of equal shares of biological and fossil CO.sub.2 (as above 120,000 cbm), is sequestered.

[0145] The other half of the synthesis gas is reacted with 240,000 cubic meters of Hz, which is obtained in the second operational stage by the electrolysis of water from 1 million kW of excess electric power according to Reaction 3, to yield 120,000 cubic meters of methane according to Reaction 2. The balance and transfer of the bioactivity is as above. Here too, about 800,000 kW of ecological power is obtained. Together with the 400,000 kW from the first operational stage, 1.2 million kW of (CO.sub.2-neutral) ecological power is obtained according to this variant.

[0146] 120 tons of wood, converted to electricity separately in a power plant, yields only 300,000 to 400,000 kW of ecological power.

[0147] One feature of the present invention is the fact that the quantities in the chemical reactions are exactly matching. Therefore, the quantitative ratios in the biological and fossil raw materials should be selected so that fossil methane, to which the bioactivity of stored bio-carbon dioxide can be transferred, is always sufficiently produced.