TL;DR: Green hydrogen replaces fossil fuels as a high-temperature heat source and chemical reductant in steel, cement, and ammonia production, emitting only water vapor. To decarbonize heavy industry, you must source electrolytic hydrogen from renewables, adapt your furnaces or reactors, and build a local storage and pipeline loop.
Step 1: Audit Your Industrial Heat and Chemical Needs
Heavy industry uses energy in two ways: combustion heat (e.g., 1,500°C in blast furnaces) and chemical reduction (removing oxygen from iron ore). List every process that currently burns coal or natural gas. For each, note the required temperature, pressure, and whether you need a reducing atmosphere (like CO) or just heat. Green hydrogen can do both, but the equipment differs. If you only need heat below 1,000°C, you can retrofit a gas burner. For steel direct reduction, you need a shaft reactor, not a blast furnace.
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Step 2: Secure Renewable Electricity and Electrolyzer Capacity
Green hydrogen is made by splitting water in an electrolyzer powered by wind or solar. Calculate your hydrogen demand in tonnes per day. Multiply by 50 MWh per tonne (current efficiency) to get your electricity need. For a mid-size steel plant (2 Mt/yr), that’s ~10 GW of dedicated renewables. Tip: sign a power purchase agreement with a nearby wind farm or build solar adjacent to your site. Avoid grid power unless you can prove it’s 100% renewable via certificates—otherwise your hydrogen is “grey” and defeats the purpose.
Step 3: Install Electrolyzers and Compression
Use PEM (proton exchange membrane) electrolyzers for fast ramp-up with solar/wind intermittency, or alkaline for steady baseload. Place them as close to your plant as possible to minimize hydrogen transport losses. Output hydrogen is low-pressure (10–30 bar). Compress it to 200+ bar for pipeline transport or to 700 bar for trucking. Tip: install a buffer tank (1–2 days of consumption) to smooth out renewable dips. For cryogenic liquid storage, you’ll need -253°C, which consumes 30% of the hydrogen’s energy—avoid unless you have no pipeline.
Step 4: Retrofitting Burners and Reactors
For heat: Replace natural gas burners with hydrogen-adapted nozzles. Hydrogen burns faster and hotter, so you must redesign flame arrestors and combustion chambers to prevent flashback. Use flameless oxidation (FLOX) burners that dilute hydrogen with recirculated flue gas, lowering NOx emissions. For steel: Switch to a direct reduced iron (DRI) shaft using pure H₂ as the reductant at 800–900°C. The product is solid sponge iron, which you then melt in an electric arc furnace. For cement: Use hydrogen in the calciner (preheater) but keep the kiln’s flame temperature; note that CO₂ from limestone decomposition is unavoidable, so you’ll need carbon capture for that fraction.
Step 5: Close the Loop with Storage and Byproducts
Heavy industry runs 24/7, but renewables don’t. Install underground salt cavern storage for large volumes (weeks), or compressed steel tanks for daily cycling. Recover the water vapor from your exhaust stacks—condense it and feed it back to the electrolyzer. Tip: pair with an ammonia plant to use hydrogen as a seasonal storage medium (synthesize ammonia, then crack it back to H₂ and N₂ when needed). Also, capture waste heat from electrolyzers (they run at 60–80°C) for preheating feedstocks.
Step 6: Pilot, Measure, and Certify
Run a 6-month pilot on one production line. Monitor hydrogen purity (must exceed 99.97% for DRI), furnace refractory wear, and nitrogen oxide (NOx) emissions—hydrogen flames can produce thermal NO
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