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报告摘要

Summary of the Document: Blue Hydrogen in the Circular Carbon Economy

Core Content

This document explores the role of blue hydrogen in the Circular Carbon Economy (CCE) as a potential tool for climate mitigation. Blue hydrogen is defined as hydrogen produced from fossil fuels with carbon capture and storage (CCS), resulting in very low life-cycle CO₂ emissions. It is contrasted with green hydrogen, produced from renewable energy via electrolysis, and discussed in terms of production costs, emissions abatement opportunities, and resource requirements.

The report emphasizes that to meet the 1.5°C climate target, net-zero emissions must be achieved as soon as possible, followed by CO₂ removal from the atmosphere. The CCE framework, introduced by KAPSARC, extends the traditional Circular Economy concept (Reduce, Reuse, Recycle) by adding a fourth R: Remove, which includes technologies such as CCS, BECCS, DAC, and afforestation.

Main Views

1. Current Hydrogen Production and Use

Approximately 120Mt of hydrogen is produced annually, with 98% from fossil fuels (natural gas or coal).
Only 1% of this is produced with CCS, while 1.9% is a by-product of chlorine and caustic soda production.
Less than 0.4% is produced via renewable-powered electrolysis.
Pure hydrogen is used mainly in refining and ammonia production, while syngas (hydrogen mixed with CO) is used in methanol production, direct reduction iron making, and other industrial applications.
Fuel cell electric vehicles use less than 0.01Mt of pure hydrogen annually.

2. Emissions Abatement Opportunity

Clean hydrogen has the potential to significantly reduce global CO₂ emissions.
The Hydrogen Council estimates that 530Mtpa of hydrogen could be in demand by 2050, and if met with clean hydrogen, could deliver 6 billion tonnes of CO₂ abatement.
Meeting this demand would require scaling up clean hydrogen production from <2Mtpa to >500Mtpa in <30 years.

3. Clean Hydrogen Production Costs

Blue hydrogen (from fossil fuels with CCS) is currently the lowest cost option for clean hydrogen, at around USD2/kg.
Green hydrogen (from renewable electrolysis) has a wider cost range, from USD2.30/kg to USD7.70/kg, due to electricity prices, electrolyzer capital costs, and capacity factors.
Renewable hydrogen becomes cost-competitive with SMR or coal gasification with CCS only when high-quality renewable resources and low-cost land are available, and electrolyzer costs are reduced.

4. Cost Drivers for Fossil Pathways with CCS

Fuel cost is the main driver for blue hydrogen production.
Gas is cheaper than coal, and capital cost is the largest component in low-cost gas regions.
CO₂ transport and storage costs significantly affect the total cost, especially for coal-based hydrogen, which requires 22kg of CO₂ per kg of H₂.
A USD20/t CO₂ transport and storage cost is assumed in most calculations, leading to USD2.40/kg for gas-based blue hydrogen and USD2.20/kg for coal-based blue hydrogen.

5. Cost Drivers for Renewable Hydrogen

Electrolyzer capital cost, electricity price, and utilization rate are the main cost drivers.
Lower capital costs and reduced electricity prices are key to making renewable hydrogen competitive.
The capacity factor of renewable energy sources is crucial; 36% is cited as a benchmark for cost reduction.

6. Reducing the Cost of Clean Hydrogen Production

Economies of scale and integration of production and CCS can significantly reduce costs.
Better heat integration and reduced material use (e.g., stainless steel) contribute to cost savings.
New CCS technologies such as chemical looping, adsorption, solvents, and membranes offer the potential for step-change cost reductions.
The Allam Cycle is a promising new approach that integrates electricity, hydrogen, and ammonia production with inherent CO₂ capture, potentially offering 100% CO₂ capture at lower costs.

7. Resource Requirements for Clean H₂ Production

Land, water, and electricity are critical for renewable hydrogen production.
CO₂ storage capacity (pore space) is essential for fossil-based hydrogen with CCS.
Biomass for hydrogen production is limited and may compete with other uses.

Key Information

Blue hydrogen is low-emission but not zero-emission, and is currently the cheapest clean hydrogen option.
Green hydrogen is more expensive and requires high-quality renewable resources and low-cost land.
CCS is essential for achieving net-zero emissions and CO₂ removal.
Hydrogen Council and IEA suggest that clean hydrogen could play a major role in decarbonizing the global economy.
Scaling up production is necessary to meet future demand and support climate targets.
Technology development, economies of scale, and policy support are crucial for reducing costs and enhancing viability.

Conclusion

Blue hydrogen, produced from fossil fuels with CCS, is a viable option for reducing emissions and supporting the Circular Carbon Economy. It is currently the most cost-effective clean hydrogen method, though renewable hydrogen has the potential to become more competitive with cost reductions in electrolyzers, electricity, and scale. The successful deployment of blue hydrogen will depend on efficient CCS infrastructure, co-location of resources, and policy support to enable widespread adoption and long-term sustainability.