Biomass gasification coupling technology has a new breakthrough

Recently, Beijing Babcock Welkox Co., Ltd. (hereinafter referred to as 'Beijing Bawei Company') cooperated with Tsinghua University to develop 'internal and external double-circulation turbulent fluidized bed heat pipe cooling low tar biomass gasification coupling combustion Coal unit power generation technology'.

Provide technical support with rigorous testing

In order to reduce carbon dioxide emissions, Beijing Bawei Company and Tsinghua University Thermal Energy Engineering Department set up a research and development team to develop biomass gasification coupling coal-fired unit power generation technology from 2017. In order to obtain accurate gasification data, it provides strong technical support for practical projects. At the beginning of 2018, Beijing Bawei Company and Tsinghua University established a 6-meter-high internal and external double-circulation turbulent fluidized bed biomass gasification test device at the Zhangjiakou Experimental Base of Tsinghua University.

In this test device, the R&D personnel performed gasification products, ash and slag characteristics and differences on various biomasses, various biomass types, different gasification parameters, and varying secondary air rates. Tests and research. After hot and cold commissioning and multiple tests, the R&D team has obtained reliable data and ideal results. When burning low-calorie calories with less than 3100 kcal/kg of corn stover, biomass gasification The low calorific value has reached 1500 kcal per cubic meter of natural gas, and the proportion of carbon monoxide, hydrogen and methane in biomass gas has reached 36.5%. The test results and data fully demonstrate that the turbulent fluidized bed technology can realize biomass from High conversion rate from solid to flammable gas. Although the heat is hot this summer, the R&D team is still working on deepening the test. Next, they will carry out some special fuels such as oil sludge and other hazardous waste gasification tests.

After more than one year of research and development work, and based on the data obtained from the test, the R&D team has improved the power generation technology scheme for biomass gasification coupled coal-fired units several times, and developed the internal and external double-cycle turbulent fluidized bed heat pipe cooling low tar biomass. Gasification coupled coal-fired unit power generation technology'.

Efficient cleaning and energy transformation

'Inside and outside double-circulation turbulent fluidized bed heat pipe cooling low tar biomass gasification coupled coal-fired unit power generation technology', using variable-section gasification furnace 分级, grading air distribution, plus two-stage separator design, so that the material is in the furnace Fluidized turbulence, mainly in internal circulation, and external circulation, long reaction time and uniform reaction. This technology keeps biomass ash in the gasification system, and produces low biomass in the biomass gas, which will not be coupled. The coal-fired power station boiler produces ash and high-temperature corrosion on the heated surface; it can fully decompose long-chain biomass tar and make the tar content in the biomass gas less. The application of heat pipe heat transfer technology cools the biomass gas. At the same time, it ensures that the wall temperature of the heat exchanger is stable and higher than the precipitation temperature of the tar, thus ensuring the continuous and stable operation of the heat exchanger and the gasification system. The membrane water wall structure and the medium temperature separation technology make the gasifier and the first stage The refractory material of the separator is thinly laid, which greatly shortens the start-up and shutdown time of the gasification system, enables the gasification system and the coal-fired power station boiler to be better coupled, and achieves efficient and clean power generation. The R&D team is based on coal-fired electricity. The actual situation of the station boiler, overall consideration, design of different biomass gasification coupling coal-fired unit combustion system and boiler transformation program, improve the fuel-burning capacity of coal-fired power station boilers, reduce pollutant emissions, and not the overall coal-fired power station boiler Performance has an adverse effect.

Beijing Bawei Company entrusted the Machinery Industry Information Research Institute to conduct a search for 'inside and outside double-cycle turbulent fluidized bed heat pipe cooling low tar biomass gasification coupled coal-fired unit power generation technology'. The Machinery Industry Information Research Institute has 35 domestic and foreign The database was analyzed, compared and identified. The conclusion was 'internal and external double-circulation turbulent fluidized bed heat pipe cooling low tar biomass gasification coupled coal-fired unit power generation technology', except for the literature published by Beijing Bavi and Tsinghua University, among others There is no similar report in the relevant literature, which is novel.

Beijing Bawei Company and Tsinghua University jointly developed the independent intellectual property rights 'internal and external double-circulation turbulent fluidized bed heat pipe cooling low tar biomass gasification coupling coal-fired unit power generation technology', which solved the biomass gasification alkali metal corrosion and tar Problems such as precipitation can guarantee the efficient and safe operation of the gasification and coupling system, and have the basis and strength for market promotion.

According to industry experts, biomass gasification coupled coal-fired units are currently the most efficient and cleanest route to utilization of biomass energy.

In China, biomass energy is the fourth energy resource after coal, oil and natural gas. It plays an important role in the energy system. As a renewable energy source, biomass energy can save coal, improve China's energy structure, and reduce Carbon dioxide and sulfur dioxide and soot emissions, so as to achieve environmental protection, is of great significance to energy transformation.