Decarbonized Hydrogen​

The term blue hydrogen refers to hydrogen produced from natural gas or coal using steam methane reforming (SMR) or other methods and separated from CO2, which is sequestered using carbon capture, utilization and storage (CCUS) reducing the levels of greenhouse gas emitted into the environment. The blue color denotes the far cleaner energy stream that results, which today is for the most part less costly and more commercially viable than fully renewable green hydrogen. 

Blue hydrogen is not only several orders of magnitude less carbon intensive than gray hydrogen, which is produced from fossil fuels without CCUS, but the processes used are more easily scaled and well-tested than those available to make renewable hydrogen from electrolysis. These factors and the abundance of raw hydrocarbon feedstock could give blue hydrogen a cost advantage in the market as companies and consumers, particularly in transportation and heavy industry, weigh uncertainty in near-term energy prices against long-term sustainability goals.

Existing fossil fuel-based hydrogen generation methods and CCUS all require energy, capital resources and workforces to operate, and there will likely always be industrial processes that emit some positive net level of carbon. The primary concerns for blue hydrogen producers and users today are safety, efficiency and reliability. Ensuring purity, precisely controlling process units, achieving the highest possible CO2 capture rates, optimizing storage capacity, and managing energy and maintenance costs are all necessary to make sure a steady supply of hydrogen is available to meet quickly rising demand.

The most common method of manufacturing hydrogen from natural gas, steam methane reforming, is integral to the industrial-scale commercial production of blue hydrogen. SMR applies steam under tremendous temperature and pressure to a chemical catalyst that separates hydrogen from feedstock and binds carbon to oxygen atoms from water, forming CO2 as a byproduct. The throughput and efficiency of the process depends on maintaining an optimal ratio of steam to carbon entering the reformer, protecting the catalyst from coking and managing energy usage.

CCUS refers to various greenhouse emissions reduction technologies applied to the energy value chain. In the case of blue hydrogen, three of the most used and well-understood methods of carbon capture are vacuum swing adsorption (VSA) and pressure swing adsorption (PSA), both of which are capable of capture rates above 90%, and amine-based adsorption. The challenges involving PSA and VSA are similar – ensuring safety, purity and reliability despite very high cycle rates and preventing leaks that cause lower capture efficiency. Amine-based adsorption involves a tradeoff between the energy needed to regenerate the chemical solvent used in the carbon capture process and the rate of efficiency of the process itself.

A key selling point for decarbonized (blue) hydrogen is that the kinds of automation technologies needed to drive costs down and keep efficiency up already exist and are relatively inexpensive. Automation can improve the efficiency and profitability of SMR units by controlling the steam-to-carbon ratio with greater precision using advanced process control systems, online asset monitoring and mass flow meters. It’s possible to extend the life of the catalyst using continuous chemical composition analysis, which is essential for improving the performance of the above-mentioned CCUS methods as well. When applied to evaluate energy-related KPIs, energy management information systems (EMIS) make it easier for hydrogen plants to hit their operations’ optimal steam and electricity usage targets