Biomass gasification coupling technology has a new breakthrough

A few days ago, Beijing Babcock Wilcox Co., Ltd. (hereinafter referred to as “Beijing Bawei Company”) and Tsinghua University jointly developed “internal and external double-circulation turbulent fluidized bed heat pipe cooling low-tar biomass gasification coupled combustion Coal power generation technology ".

Provide technical support with rigorous testing

In order to reduce carbon dioxide emissions, Beijing Bawei Company and the Department of Thermal Engineering of Tsinghua University set up a research and development team, starting in 2017 to develop biomass gasification coupled coal-fired power generation technology. In order to obtain accurate gasification data and provide strong technical support for the actual project, in early 2018, Beijing Bawei Company and Tsinghua University established a 6-meter-high internal and external double-circulation turbulence at the Zhangjiakou Test Base of Tsinghua University Dynamic fluidized bed biomass gasification test device.

In this test device, the R & D personnel carried out the gasification products, ash and slag characteristics and differences under the conditions of multiple biomass, multiple forms of the same biomass, different gasification parameters and varying primary and secondary air rates. Experiment and research. After cold and hot debugging and multiple tests, the R & D team has obtained reliable data and ideal results. When burning corn straw with a low calorific value of less than 3100 kcal / kg, the low calorific value of biomass gasification gas has reached 1500 kcal per cubic meter of natural gas. The ratio reached 36.5%. The test results and data fully illustrate that the turbulent fluidized bed technology can achieve a high conversion rate of biomass from solid to combustible gas. Despite the intense heat this summer, the R & D team is still carrying out in-depth test work. In the next step, they will conduct some special fuels such as oil sludge and other hazardous waste gasification experiments.

After more than a year of research and development work, and based on the data obtained from the experiment, the research and development team has repeatedly improved the power generation technology plan of the biomass gasification coupled coal-fired unit, and developed the "internal and external double-circulation turbulent fluidized bed heat pipe cooling low tar biomass Gasification coupled coal-fired power generation technology ".

Boost energy transformation with efficient cleaning

"Internal and external double-circulation turbulent fluidized bed heat pipe cooling low-tar biomass gasification coupled coal-fired power generation technology", using variable cross-section gasification furnace, graded air distribution, plus two-stage separator design, so that the material is in the furnace Fluidized and turbulent, mainly internal circulation, and external circulation, long reaction time and uniform reaction. This technology leaves biomass ash in the gasification system, and the produced biomass gas has a low ash content, which will not adversely affect the ash accumulation of the coal-fired power plant boiler and the high temperature corrosion of the heated surface; The material tar is fully decomposed, so that the tar content in the biomass gas is small. The application of heat pipe heat exchange technology, while cooling the biomass gas, ensures that the wall temperature of the heat exchanger is stable and higher than the tar precipitation temperature, thereby ensuring the continuous and stable operation of the heat exchanger and the gasification system. Membrane water wall structure and medium temperature separation technology make the refractory of the gasification furnace and the first-stage separator thinly laid, greatly reducing the start-up and shutdown time of the gasification system, so that the gasification system and the coal-fired power plant boiler can Ground coupling to achieve efficient and clean power generation. According to the actual situation of coal-fired power station boilers, the R & D team has designed different biomass gasification coupled coal-fired unit combustion systems and boiler retrofitting schemes to improve the combustion stability of coal-fired power station boilers, reduce pollutant emissions, and not The overall performance of coal-fired power station boilers has an adverse effect.

Beijing Bawei Company entrusted the Machinery Industry Information Research Institute to conduct a new search for "internal and external double-circulation turbulent fluidized bed heat pipe cooling low-tar biomass gasification coupled coal-fired power generation technology." The Machinery Industry Information Research Institute analyzed, compared and identified 35 domestic and foreign databases, and concluded that “internal and external double-circulation turbulent fluidized bed heat pipe cooling low tar biomass gasification coupled coal-fired power generation technology”, except In addition to the literature published by Tsinghua University, there is no similar report in other related literatures, which is novel.

Co-developed by Beijing Bawei Company and Tsinghua University with independent intellectual property rights "internal and external double-circulation turbulent fluidized bed heat pipe cooling low tar biomass gasification coupled coal-fired power generation technology", which solves biomass gasification alkali metal corrosion and tar Problems such as precipitation can guarantee the efficient, safe and stable operation of the gasification and coupling system, and have the foundation and strength to promote to the market.

Industry experts evaluated that biomass gasification coupled coal-fired power generation is currently the most efficient and clean technology route for utilizing biomass energy.

In China, biomass energy is the fourth energy resource after coal, oil and natural gas, and occupies an important position in the energy system. As a renewable energy source, the use of biomass power generation can save coal, improve China's energy structure, reduce carbon dioxide and sulfur dioxide and soot emissions, thereby achieving environmental protection, which is of great significance to the energy transition. (Xu Bo)

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