Suppose the CO2 output from the plant in Example 6-9 in the previous chapter is piped to the Sumatra coal field in Indonesia (see Table 7-1), where it is 100% injected into the field for sequestration and to generate methane. Assume that natural gas production without CO2 injection has been

Question

Suppose the CO2 output from the plant in Example 6-9 in the previous chapter is piped to the Sumatra coal field in Indonesia (see Table 7-1), where it is 100% injected into the field for sequestration and to generate methane. Assume that natural gas production without CO[latex]_2[/latex] injection has been exhausted prior to the project, and that methane is worth $10.50/GJ. (a) For how long will the coal field be able to sequester the CO[latex]_2[/latex]? (b) What is the annual value of the methane production?

Accepted Answer

(a) From Example 6-9, the annual coal consumption is 2.26 million tonnes/year. With a carbon content of 85%, the resulting CO[latex]_2[/latex] is

(2.26 × 10[latex]^6[/latex] )(0.85)(44/120) = 7.04 × 10[latex]^6[/latex] tonnes CO[latex]_2[/latex]

Since the total capacity of the field is 370 million tonnes CO[latex]_2[/latex], there are 52.5 years of capacity available.

This is similar to the lifetime of a typical coal-fired plant built today.

(b) The conversion rate of the field is 267.9 m[latex]^3[/latex] CH[latex]_4[/latex] per tonne CO[latex]_2[/latex], and from Chap. 5, the energy content of gas is 36.4 MJ/m[latex]^3[/latex]. Accordingly, the gas output is

[latex]\left(7.04 imes 10^{6} ight)(267.9)(36.4)\left(\frac{1 \mathrm{GJ}}{1000 \mathrm{MJ}} ight)=6.87 imes 10^{7} \mathrm{GJ}[/latex]

At $10.50/GJ, the value of the gas output is approximately $721 million/year.

Question 7.3: Suppose the CO2 output from the plant in Example 6-9 in the ...

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