Driven by national dual‑policy requirements for ultra‑low emissions and industrial carbon neutrality, high‑energy‑consuming enterprises across steel, papermaking, ceramics, chemical and heating sectors are accelerating low‑carbon retrofits for natural‑gas‑fired boilers and internal combustion engines via hydrogen blending. Boasting low retrofit investment and dual benefits of emission reduction and efficiency improvement, HCNG (Hydrogen‑Enriched Compressed Natural Gas) combustion technology has become the optimal solution for low‑carbon transition of existing gas‑fired equipment. Previously, China’s retrofit market was long dominated by overseas electronic control products from suppliers such as Bosch and Woodward. In recent years, breakthroughs in fully‑independent underlying software and hardware technologies have opened up opportunities for comprehensive substitution by domestically‑developed hydrogen‑blending control systems.
Extensive field test data has verified that 20 vol% represents the optimal stable hydrogen‑blending ratio for natural gas. Hydrogen blending accelerates flame propagation, widens the lean‑burn limit from 1.7 to 2.4, raises the comprehensive thermal efficiency of units by 1.5%‑6.8%, cuts overall fuel consumption by 7%‑10%, and reduces NOₓ emissions by more than 50%. Exhaust gas indicators steadily meet China National VI emission standards without complicated post‑processing equipment. The retrofit does not require replacement of boiler or internal‑combustion‑engine main bodies. Only hydrogen injection‑mixing assemblies and supporting electronic control units need to be installed. Existing natural‑gas pipeline networks and filling station infrastructure remain fully compatible. Short shutdown periods during renovation impose minimal disruption to enterprise production.
Earlier industry retrofit projects relied heavily on imported controllers, which came with high procurement costs. Underlying programs and control logics could not be modified locally, and after‑sales technical support depended on overseas manufacturers with long response lead times. Leading domestic developers have completed full in‑house coding for underlying electronic‑control drivers, real‑time operating systems, OBD fault diagnosis and dynamic air‑fuel‑ratio regulation. Hardware procurement costs are reduced by 40%. Customized control strategies are available for diverse working conditions including ceramic kilns, oil‑field steam‑injection boilers and gas‑fired generator sets as well as passenger vehicles. Free remote online firmware iteration is supported with no foreign‑technology licensing barriers.
National hydrogen‑energy demonstration city clusters have designated industrial hydrogen‑blending retrofits as one of six key demonstration tracks. Energy‑saving‑renovation subsidies in multiple regions favor such projects, enabling individual retrofit projects to obtain both equipment‑investment allowances and carbon‑emission‑reduction benefits, thus continuously unlocking market demand. Industry statistics show that the number of filed industrial hydrogen‑blending retrofit projects nationwide rose by 132 % year‑on‑year in H1 2026. Domestic technology service providers with national‑level technical appraisal certificates, proven cross‑sector application cases and fully self‑owned electronic‑control solutions are seeing rapid order growth. Light‑weight hydrogen‑blending retrofits for existing gas‑fired equipment will form a trillion‑yuan stock‑renewal market, where domestically‑developed and controllable technologies will capture dominant market share.
