Producing India’s subsequent clear gas

WE have all heard the idiom — killing two birds with one stone. Scientists on the Bhabha Atomic Analysis Centre (BARC), Mumbai, and the Indira Gandhi Centre for Atomic Analysis (IGCAR), Kalpakkam, seem to have gone one higher. Utilizing the Quick Breeder Take a look at Reactor (FBTR), they’ve demonstrated {that a} single reactor can concurrently carry out three features: generate electrical energy, convert non-fissile thorium into nuclear gas and now produce inexperienced hydrogen utilizing its waste warmth.

A number of industries depend upon hydrogen as a uncooked materials. It’s indispensable for manufacturing ammonia, the start line for urea fertilisers. It’s also used to provide methanol, an vital feedstock for plastics, paints and different industrial chemical substances and in petroleum refineries to take away sulphur from fuels by means of hydrodesulphurisation.

Hydrogen can be anticipated to play an vital function in future transport techniques. In gas cells, which energy e-vehicles, hydrogen combines with oxygen from the air to generate electrical energy, producing solely water vapour because the exhaust. Gasoline-cell automobiles may be refuelled inside minutes, very similar to petrol or diesel automobiles, making them beneficial for heavy vans, ships and doubtlessly plane, the place battery-powered techniques face limitations attributable to their weight and lengthy charging occasions.

Hydrogen just isn’t present in nature in a free kind. It must be taken from water or hydrocarbons, the place the hydrogen atoms are securely connected. Breaking these robust chemical bonds requires plenty of vitality.

At present, a lot of the world’s hydrogen is produced both by steam methane reforming, which extracts hydrogen from pure gasoline, or by electrolysis. When the electrical energy for electrolysis comes from coal — or gas-fired energy stations, the method additionally ends in vital carbon emissions.

Hydrogen produced by means of such fossil-fuel-dependent routes is called gray hydrogen. In impact, the air pollution is shifted from the purpose of use to the purpose of manufacturing, with little general discount in greenhouse gasoline emissions.

For this reason nations are investing in inexperienced hydrogen, hydrogen produced with little or no carbon emissions. Scientists are learning a number of approaches — from solar- and wind-powered electrolysis to organic strategies that use microorganisms. India has chosen a novel route.

India has one of many largest thorium reserves on this planet, however solely restricted uranium reserves, which is the gas utilized in most nuclear reactors immediately. A lot of its uranium ore is of comparatively low high quality, making extraction and processing expensive. Nevertheless, thorium can’t be used instantly as nuclear gas, simply as freshly reduce inexperienced wooden can’t be used instantly as firewood. It should first undergo a metamorphosis.

That is the place quick breeder reactors (FBRs) are available. Across the reactor core, engineers place a blanket of thorium. As high-energy, or ‘quick’, neutrons escape from the core, they’re absorbed by the thorium blanket.

By a collection of nuclear transformations, the thorium is progressively transformed into uranium-233 (U-233), a superb reactor gas. As a result of these reactors produce recent nuclear gas whereas producing electrical energy, they’re referred to as breeder reactors.

Creating this know-how was removed from simple. For a number of a long time, India’s nuclear programme operated beneath know-how denial regimes imposed by western nations. Indian scientists due to this fact needed to develop quick breeder reactor know-how largely on their very own.

To realize the required expertise in designing, setting up and working sodium-cooled quick reactors, IGCAR commissioned the FBTR in 1985. 4 a long time of working expertise constructed the scientific and engineering basis for the 500-megawatt prototype quick breeder reactor (PFBR), which achieved first criticality in 2026.

A nuclear reactor produces warmth. The warmth from nuclear fission turns water into steam. This steam drives a turbine related to {an electrical} generator. Nevertheless, solely about one-third of this thermal vitality will get transformed into electrical energy. The remaining two-thirds is launched as waste warmth by means of cooling techniques.

For many years, engineers have sought methods to place this warmth to productive use. One established software is district heating. In nations with extreme winters, together with Russia, China and several other European nations, waste warmth from nuclear energy stations is piped to close by cities and cities to warmth houses, workplaces and industrial buildings, lowering the consumption of coal and pure gasoline.

One other software is desalination. Coastal nuclear energy crops use reactor warmth to transform seawater into recent ingesting water. For instance, at Kalpakkam, a desalination plant coupled to the Madras Atomic Energy Station (MAPS) makes use of a hybrid multi-stage flash (MSF) and reverse osmosis (RO) system to provide ingesting water from seawater.

The subsequent frontier is hydrogen manufacturing. Researchers around the globe are exploring two broad approaches. One seeks to enhance the effectivity of standard electrolysis through the use of reactor warmth to generate steam earlier than electrical energy splits the water into hydrogen and oxygen, thereby lowering electrical energy consumption. The opposite depends on thermochemical cycles, during which warmth slightly than electrical energy drives a sequence of chemical reactions that break up water.

Right here, reactor temperature turns into the deciding issue. Typical pressurised water and pressurised heavy water reactors, together with these at MAPS, function with coolant temperatures of about 300-330°C, whereas most thermochemical cycles require a lot larger temperatures.

China, for instance, is investigating the sulfur-iodine (S-I) thermochemical cycle utilizing its high-temperature reactor pebble-bed module (HTR-PM) at Shidao Bay, the place helium coolant leaves the reactor at round 750°C.

India has taken a special strategy. The sodium coolant within the FBTR leaves the reactor at about 480-520°C. Scientists at BARC developed the copper-chlorine (Cu-Cl) thermochemical cycle to function effectively inside this temperature vary.

Working with engineers at IGCAR, they built-in the method into the reactor and demonstrated that the reactor’s waste warmth can be utilized to provide inexperienced hydrogen. In doing so, the FBTR has demonstrated {that a} single reactor can generate electrical energy, breed nuclear gas and now produce inexperienced hydrogen, a mix that might broaden the function of nuclear vitality past energy era.

The hydrogen plant connected to the FBTR is a know-how demonstrator slightly than a industrial facility. The subsequent problem is to scale up the method and develop industrial thermochemical hydrogen crops that may utilise the waste warmth from future quick breeder reactors.