Techno-Economic Evaluation of Power-to-Gas Solutions

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Dr. Raisz Dávid Márk
Department of Electric Power Engineering

The aim of the thesis was to investigate and to get an overall picture about energy storage alternatives which is necessary for integration of the renewable energy sources.

The first part is based on the literature, we can get a short summary about the necessity of storage and its different solutions.

In additional, I reviewed Power to Gas technology in details, it promises both cost-effectiveness and technologically solution. In the conception of Power to Gas the renewable sources energy originating from the production of a surplus in the manner like we produce hydrogen with carbon dioxide reacting methane. The methane storable in the available gas system and in the case of claim some store energy can win back through gas engines.

Due to it is not necessary establish big containers so we can reduce the investment cost significantly.

I also had to analyse the opportunities of the technological feasibility in the system regulation and efficiency of the particular devices.

After this I examined the economic opportunities implied in this technology. The emergent substances return by incomes originating from the realization of the methane and the oxygen and its reserves. From these I prepared a short summary.

Examining the theme, I made the calculating model to help me to examine the cost-efficiency of the units in different structures and regulations.

I modelled a 10 MW Power to Gas plant taking possibility and limits of process into consideration. I examined the model’s economic function and contribution margin in a given period. I counted the maximum contribution margin connected to the prices of a period, the cost and the income in the model. 2014 was the examined period.

After these I dealt with an alternative technology of Power to Gas, with Power to Methanol. I analysed its benefits, advantages and its technical parameters. During Power to Methanol process we store electric power in the form of methanol, in such a way that react on some water and carbon dioxide with the use of electric power, then produce methanol from the synthesis gas. Under the technological circumstances this process is suitable for the cover of the control reserve, so I modified the calculations and I did it in the case of Power to Methanol model.

Finally, I compared the examined technologies and I estimated the received results. As a result of the calculations I got positive contribution margin in all cases, so this shows that Power to Gas and Power to Methanol may be viable according to economic viewpoints. I analysed the capital cost and time of return, too.

In conclusion I can say that based on received results these technologies are economically competitive and providing a business opportunity for its realization and integration into the system regulation process.


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