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Rising-tube waste heat recovery
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Product Description
Technological Advantages
Technological Innovation:
Pioneered a specialized nanocoating‑based self‑cleaning equipment for rising‑pipe heat exchange, overcoming the adverse effects of high‑temperature corrosion on materials, and developed the world’s first industrial‑scale integrated system for recovering waste heat from raw coke oven gas in the rising pipe. Designed innovative flow‑diverting structures and seamless low‑stress rising‑pipe designs, enabling stable operation throughout the entire coking cycle despite fluctuations in process temperatures and eliminating the risk of water leakage into the carbonization chamber. Developed a uniform‑heating rising‑pipe heat‑exchange system, along with advanced technology for evenly distributing water across steam‑water pipelines, achieving controllable heat‑exchange efficiency and balanced, stable steam production, thereby resolving the issue of uneven heat transfer in rising pipes. Created a rising‑pipe heat‑exchanger capable of producing high‑quality medium‑pressure and superheated steam, and engineered rising‑pipe heat exchangers that generate both saturated medium‑pressure steam and high‑temperature superheated steam, meeting diverse user requirements.
Key technologies: High-temperature-resistant nanocoating.
Key equipment: riser heat exchanger.
Product Description
Process flow
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| Application Performance of Industrial-Scale Units | Benefit Analysis (Taking a 6-meter coke oven with an annual production capacity of 1.1 million tons of coke as an example) | ||
| 01 | Completely addresses the “four fears” of waste heat recovery systems: fear of water leakage, fear of tar deposition, fear of carbon‑black scaling, and fear of dry‑burning. | Efficient recovery of waste heat generated from raw coke oven gas during the coking process is both a strategic direction and a significant potential for coking enterprises to conserve energy, build green coking operations, and achieve energy savings and emission reductions; it also represents one of the primary pathways for lowering energy consumption and enhancing operational efficiency. | |
| 02 | Improve the working environment for furnace-top operators and reduce their physical workload. | Economic benefits | It can produce approximately 110,000 tons of saturated steam, with a static investment payback period of about 2 years. |
| 03 | Longest service life throughout the entire lifecycle | Total annual profit | Around 13 million |
| 04 | High steam production per ton of coke | Government subsidies | The national policy provides energy-saving subsidies of approximately RMB 4.5 million. |
| 05 | Intelligent control, unattended operation | Social benefits | It reduces thermal radiation, significantly lowers the ambient temperature in the coke oven top space, and improves the working environment for personnel at the furnace top. |
| 06 | Short construction period (online replacement of riser pipes in renovation projects) without disrupting normal coke oven operations. | Energy conservation and emissions reduction | This is equivalent to 11,000 tons of standard coal and a reduction of nearly 27,000 tons of carbon dioxide, demonstrating significant energy-saving and emission-reduction results. |
| 07 | Low investment and a short payback period (around 2 years) | Reduce energy consumption in the coking process. | The reduction in process energy consumption per ton of coke exceeds 8 to 10 kilograms of standard coal. |
Project Cases
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China’s first industrial-scale coke oven
Fujian Sangang Mingguang Coking Plant—2 × 65‑hole, 900,000‑ton‑per‑year coke production project featuring a 4.3‑meter coke oven and waste heat recovery from raw coke oven gas.
Commissioned in February 2014, the facility has successfully generated saturated steam (at 0.5 MPa pressure and 161°C) to meet the production needs of the coal‑chemical workshop. Steam production reaches 85 kg per ton of coke, yielding an annual profit of approximately RMB 6.8 million. |
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China’s first newly built coke oven riser waste heat recovery system
Shandong Shiheng Special Steel Coking—81‑cell, 750,000‑ton‑per‑year coke production project featuring a 5.5‑meter coke oven and waste heat recovery from raw coke oven gas.
It was commissioned in January 2018 and passed acceptance testing in September 2018, achieving a steam production rate of over 124 kg per ton of coke and generating annual profits of approximately RMB 10.8 million. 。 |
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For the first time, superheated steam has been produced in the riser of raw gas. Waste Heat Recovery Unit
Inner Mongolia Baogang Coking Plant – 2 × 50‑cell, 6‑meter coke ovens with an annual production capacity of 920,000 tonnes, featuring a waste heat recovery system for raw coke oven gas.
Commissioned in February 2019, it successfully produced superheated steam for the first time. |
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First applied to the rising pipe of raw coke oven gas in modern large-scale coke ovens. Waste Heat Recovery Unit
Shandong Xintai Zhengda – 2 × 62‑cell, 1.8 million‑ton‑per‑year, 6.78‑meter coke oven waste‑gas heat recovery project.
It went into production in March 2019. |
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First applied in a modern large-scale coke oven waste heat recovery system for the rising gas collector.
Shandong Iron and Steel Rizhao – 2 × 58‑cell, 1.7 million‑ton‑per‑year, 7.2‑meter coke oven waste heat recovery project.
It went into production in February 2019. |
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First-ever implementation of a project in which waste heat recovery steam from the riser pipe replaces the tubular furnace for heating heavy oil.
Qingdao Special Steel Coking Plant – 2 × 65‑cell, 7‑meter coke ovens with an annual production capacity of 1.6 million tonnes, featuring a waste heat recovery system for raw coke oven gas.
Commissioned in July 2021, the facility produces 1.6 MPa saturated steam to heat the rich oil to above 180°C. The steam is then superheated in a two‑stage process to generate 0.4–0.6 MPa superheated steam at temperatures exceeding 400°C, which is supplied for oil regeneration and to the benzene recovery tower. |
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National Development and Reform Commission’s Demonstration Project for Low-Carbon Technology Innovation and Industrialization
Wuhan Pingmei-Wugang United Coking—55‑cell, 550,000‑ton‑per‑year coke production project featuring a 6‑meter coke oven and waste heat recovery from raw coke oven gas.
Commissioned in October 2016, the facility achieves a steam production rate of over 130 kg per ton of coke and generates annual profits of approximately RMB 8.25 million. |
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