Norvell Nelson, PhD

Archive for November 2018

Is the Stranded Gas in North Dakota’s Bakken Field a Usable Resource?

http://norvellnelson.com/wp-content/uploads/2018/11/20180906-Stranded-Gas-in-the-Bakken-Field-Ammonia-Potential.pdf

Executive Summary

The Gas Resource

This whitepaper considers the stranded gas resources being co-produced with the “tight” oil in North Dakota’s booming Bakken and Spanish-Three Forks shale oil fields.  For simplicity these developing oil fields will be referred to, collectively, as the Bakken field in this report.  The fields are concentrated in northwestern North Dakota with major overlap into eastern Montana, southern Saskatchewan and southwestern Manitoba.  These fields are being rapidly developed at such a pace that North Dakota has climbed into 3rd place among the oil producing states in the US.

The expansion of the oil recovery operations in the Bakken area has been advancing at rates that have caused the oil and accompanying gas flows to outpace the development of the needed infrastructure required to bring these products to the market.  The lack of insufficient transport capacity is particularly acute for the gas products.  The oil can be, and is being, shipped out by rail car; the gas, without pipelines, is a stranded gas resource and is usually flared.

This report looks at several technologies which have been proposed to exploit this stranded gas resource for beneficial use.  The proposed applications for use of this stranded gas are encouraged by considering the quantity of natural gas which is in play.  Figure S-1, below, was derived using data from North Dakota[i] State Statistics.  The State of North Dakota has put fairly strict limits on the quantities of gas that may be flared as seen by its quantity remaining more or less static as total production increases.  However, Figure S-1 indicates that considerable quantities of stranded gas are still being flared.

Several uses for this stranded gas have been proposed.  These beneficial uses include conversion to ammonia for fertilizer; conversion to liquids via Fischer-Tropsch or similar processes; and, conversion to electricity using gas turbines or internal combustion engines.  Each of these technologies has their own merits and problems.  This report, part 1 of the series looking at each approach, is focused on the conversion of the gas to ammonia for farm use in North Dakota.   There is an emphasis here on the possibility of converting the stranded gas into ammonia which is a commodity with heavy usage in the agriculture sector.   North Dakota remains an agricultural state even with the Bakken play in action.

[i] https://www.dmr.nd.gov/oilgas/stats/statisticsvw.asp

The World in 2050: Four Forces Shaping Civilization’s Northern Future Are There Workable Agricultural Responses to Climate Change?

http://norvellnelson.com/wp-content/uploads/2018/11/20180806-Responses-to-Climate-Change-Agriculture-in-2050.pdf

Summary

 

This whitepaper analyzes the material presented in the book “The World in 2050: Four Forces Shaping Civilization’s Northern Future” (“2050”) by Laurence Smith, UCLA.  The author presents his predictions for the effects of climate change on the northern parts of the planet.  Professor Smith’s book describes the anticipated climate changes over the time period from 2010 to 2050.  The major prediction is that the northern parts of the planet will see a significant warming trend over this time period.  What gives his arguments real credence is that the predicted warming trend has already started and is documented for the time period 1990-2006.

 

The climate change projections made in “2050” suggest that the northern parts of the planet will warm up relative to today and will also receive increased rainfall.  This combination should provide for a northerly march of agricultural production to areas, such as Greenland, which are not today considered as productive farming areas.  This agricultural movement is compounded by the projections that the present “wheat/corn belts” will become warmer and much drier.

 

Consideration of the projected climate change consequences led to suggestions that there will be investment opportunities in the more northerly areas which are presently not amenable to productive agricultural operations.  The opportunities could be both direct, i.e., in agricultural operations, farming operations, or indirect such as grain marketing companies or even into transportation operations in the north.

 

Another area for potential investment in the north is energy.  The warming of the northern areas will make some areas more accessible for resource exploration.  One area pointed out is the gas hydrate resource which, if resource size estimates are credible (USGS), will dwarf the current estimates put on other natural gas resources in the US.

 

Further elaboration of opportunities will require more exploration of both climate change and the commercial opportunities identified.  Discussion of all of the above projections will be needed for avenues of pursuit for more detailed analyses.

Storage of Renewable Energy as Hydrogen on the Gas Grid. Is It a Workable Proposition?

http://norvellnelson.com/wp-content/uploads/2018/11/20181105-Hydrogen-Storage-on-the-Gas-Grid-Not-a-Workable-Approach.pdf

Storage of Renewable Energy as Hydrogen on the Gas Grid. Is It a Workable Proposition?

Earlier this year an article[1] appeared in Renewable Energy World quoting a report from Bloomberg which suggested that hydrogen produced from “surplus” electricity can be stored in the gas grid.  This proposal is one of many which purports to provide an energy storage solution for “surplus” electricity generated by renewable sources.  The driver for this proposal comes as the result of the non-dispatchability of renewable electricity generation as a method to accommodate the variability of, for example, wind power.  While this proposal may appear to furnish a simple solution to the renewable hydrogen storage dilemma, it has quite a few hidden pitfalls.

The storage of renewable generated hydrogen in the gas grid is not a new idea.  The concept has been proposed in Germany[2], reported by Florian Leucht at ICEPAG in 2014 at UC Irvine[3], and more recently in the Polish literature[4].  These references are not to meant to an exhaustive recounting of the literature but to serve as gateway starting points for further investigation.

Background:

Many legal jurisdictions around the world, e.g., California and Germany, have legislated mandatory renewables content for their energy portfolios.  California has an ambitious schedule of 25% by 2016 (end of & met) and 33% by 2020[5].  Germany’s portfolio standards are just as aggressive with 33% renewable content for electricity and 20% renewable content for all energy components in place by 2020[6].

In the mix of capital equipment used for generation of renewable energy, wind power has garnered the lowest cost per kW of generation capacity.  However, wind power is not dispatchable owing to the capricious nature of “every which way the wind blows”.  The variance in wind energy production as a function of time of day can be seen in the figure below.  The data are from the Tehachapi wind farm with a 5200 MW nameplate capacity and were recorded in 2010[7].  The other phenomenon of note in this figure is the timing of the peak production of the wind power in California.  Invariably, it occurs at night, in a pattern almost exactly opposed to the daily electricity demand curve.

Figure: Catalog of observed wind velocities over one month at the 5,200 MW wind farm in Tehachapi California

(See PDF Link for Figures.)

Owing to the mandated renewable’s acceptance requirements, the grid operator in CA, CA ISO, is required to purchase this wind generated energy.  As the wind energy component is not dispatchable, the CA ISO must have some fossil fuel plants on standby in order to maintain the grid integrity, if and (surely) when the wind sources fade, as they will.  Full integration of this wind resource should have some storage capability for the wind energy and/or more sophisticated weather (wind) forecasting ability to provide at least a 5-10 minute prediction window for wind performance[8] to allow for initiation of the backup generation sources.

Storage Possibilities for Non-dispatchable Renewables

Of course, when ever the question of electricity storage arises, one’s immediate thoughts go to batteries.  However, batteries will not be considered here as they are not yet ready for wide scale deployment as an economical grid scale storage solution, they are still too costly.  Another grid scale storage solution is afforded by pumped storage.  While an attractive solution to the problem, pumped storage is constrained by geographical constraints and is not considered here.  Beginning in 2013 several companies in Germany, most notably, E.ON, proposed to use electrolytic hydrogen as a storage vehicle for this excess renewable energy[9].  Energy storage built upon electrolytic hydrogen was the premise of the Bloomberg report and the main driver for this paper.

Hydrogen Generation for Storage of Excess Renewable Energy

The concept of excess renewable electricity is meant to describe the generation of renewable electricity in quantities that are unable to be used by the utility owing to lack of demand on its grid.  One solution that has been used is that the utility offers this surplus power to other energy users outside of its own grid at often negative pricing, “Take my electricity, please”.  Here we’ll look at electrolytic hydrogen generation, storage options, and, some applications.

See PDF link for full text.

A Direct Methane to Hydrogen Process

Click here to download PDF article.

 

Direct Conversion of Methane to Hydrogen and Elemental Carbon

Overview

In a recent paper in Science in November of 2017, Upham[1] et. al., describe a catalytic process that employs a molten metal catalyst system to convert methane directly into hydrogen and elemental carbon.  The reaction is very clean and occurs in 1 step with little or no product gas cleanup required, Equation 1, below.

For certain applications this process should favorably compete with the standard hydrogen production process of steam methane reforming (SMR).  In the SMR process methane is reacted with water to produce carbon monoxide and hydrogen, Equation 2.  The next step, the water gas reaction, is used to convert the carbon monoxide through reaction with water to hydrogen and carbon dioxide, Equation 3.  The article also provides a good historical background to the SMR process.

The direct reaction:

The direct conversion of methane to hydrogen and carbon

CH4 (g) -à C(s) + 2H2                       ΔH⁰ (298) + 74 kJ/mol              (1)

The reaction is endothermic so external heat has to be applied to get any reasonable conversion.  In fact, the reaction is conducted at 1000C and involves the use of a combination of Ni and a low melting metal (relative to 1000C) as the Ni carrying medium.  Supporting metals tested included Bi, Au, Pb, Ga, In & Sn, all as melts.

The molten metal reactor system for the direct conversion of methane

The authors found that a 27% Ni – 73% Bi alloy exhibited the best reactivity for the process, equation 1.  When operated at a temperature of 1065C a 95% conversion of the methane was observed.   The reaction is very clean with the gaseous hydrogen easily separating from the reactor.  The solid carbon product floated on the top of the metal melt.  The initial carbon product contained a small amount of Ni + Bi (<4atom%) which could be removed by submersion of the carbon in the molten metal bath.

The reactor

The reactor system is shown in Figure 1, in the PDF link.  The figure shows Pt as the active metal catalyst but most of the work was done with Ni as it was more active than Pt.  The rate data for all the systems studied are given in Figure S-12.  The boiling point for Bi is 1564C with a low vapor pressure at 1000C.

So…Consequences?

Hydrogen from the Direct Methane to Hydrogen Process

The hydrogen from the subject process is extremely clean but may have some unreacted methane (a who cares?).  (If the hydrogen is used for either ammonia syntheses or as a PEM fuel, the presence of methane is a “who cares”.)  Another virtue of this process is that it is a single “pot” process which should scale with the volume of the reactor, a cubic function[1].  Where could this technology be of use? See Appendix for clues.

[1] Another, hydrocarbon free process for hydrogen production is water electrolysis which produces both hydrogen and oxygen.  The best electrolyzers run with about a 68% efficiency and scale with electrode area, a square function.

Is There a Market Potential for the Direct Methane to Hydrogen Process?

(Important background information is contained in Appendix A, see PDF link.)  The US already has 2 extensive energy infrastructure networks in place, the electric grid and the natural gas pipeline grid.  So, what if we set suitably sized (market determined) direct methane to hydrogen processing units along the major transportation corridors to produce the fuel hydrogen onsite.  What could these service centers look like?

The hydrogen coming off the reactors would be fairly clean and dry but at low pressure (not too much above atmosphere pressure).  The working pressure for hydrogen fueling stations for vehicle usage is typically 70 MPa (10,000 psi).  The product hydrogen would have to be compressed to this level with, most likely, 2 stage compressors, not inexpensive.  It would have to be stored in (very) high pressure storage tanks again not cheap.  Finally, the byproduct carbon would have to be stored before pickup.  This approach would obviate the need to develop a 3rd infrastructure of hydrogen distribution pipelines, probably a pipe dream, pun intended.

 

German – Robin Update

Click here to download PDF.

 

October 2018 Update: Anatomy of a Brandy Distillery Germain-Robin

 

An article describing a visit to Germain Robin, a world class brandy distillery, located in Redwood Valley, Mendocino County, can be found elsewhere on this website under the Services section. The Germain Robin brandy operation began it the 1980s and is operated as a craft distillery using the methods Mr. Robin learned growing up in Cognac, France.  Germain Robin is a hands-on batch operation whose success was highly dependent on the skill of the master distiller.  A picture of the alembic (pot) still is shown to the left, a full description is given on the “Sources” page.  The large tank on the right is the condenser where the product is cooled and delivered.  The pot still method is not high throughput process which is usually reflected in the cost of the finished product.

 

The original article ended with the report that the Germain Robin distillery survived the October 2017 Redwood Valley fire in Mendocino County.  Most of the fire damages were concentrated on the east side of Highway 101, the main north-south artery.  Fortunately for Germain Robin it is located on the west side of the highway so escaped any major damage.

 

The Sale of Germain Robin to E & J Gallo

 

The sale of Germain Robin to E & J Gallo of Modesto was noted in the original article posted on this website.  A more detailed account of the sale of Germain Robin to Gallo was given in August of 2017 in a Wine Enthusiast article by Virginie Boone.  This article noted that “Gallo acquired the brand, its inventory of aged and aging brandies, and other finished goods.  Some of the brandies date back three decades and are made from a wide variety of grapes”.  One can get a feel for the size of this inventory from the picture of the aging warehouse, above.