Efficient and green development of coal-fired power makes ＂talking about coal＂ no longer ＂change color＂
CCTV News:Coal-fired power generation will remain the main part of China’s power supply structure for a long time. Data show that in 2018, China’s installed power capacity reached 1.9 billion kilowatts, of which coal-fired power capacity reached 1.01 billion kilowatts, accounting for 53%; The power generation is 4.45 trillion kWh, accounting for 64%.
With the challenges of carbon emission, environment and power generation cost becoming more and more severe, it is urgent for coal-fired power enterprises to find a feasible way to transform.
A few days ago, "Growing with the Republic — — The interview group of "New Media Entering New State-owned Enterprises" went to Taizhou Power Generation Co., Ltd., the national energy group, to see how this "garden power plant" did a good job in efficient and clean utilization of coal.
Built the world’s first million kilowatt ultra-supercritical secondary reheating project.
In the workshop of Taizhou Power Generation Co., Ltd., reporters saw two million kilowatt ultra-supercritical secondary reheat coal-fired units. One of them is the world’s first million kilowatt ultra-supercritical secondary reheat coal-fired generator set. The performance test shows that its power supply coal consumption is 265g/kWh, and its power generation efficiency reaches 47.82%, which is the best in the world.
"This equipment was jointly developed by Shanghai Electric and China Electric Power Consulting Group under the leadership of National Energy Group, which is 2 percentage points higher than the conventional primary reheating efficiency. "Chen Xuwei, general manager and deputy secretary of the Party Committee of Taizhou Power Generation Co., Ltd., National Energy Group, said. He further explained that an increase of 2 percentage points means that the coal used for generating primary electricity is 2 percentage points less. For example, the average coal consumption in our country is 300 grams per kilowatt-hour, and 2 percentage points means that 6 grams of standard coal is saved per kilowatt-hour. The higher the coal price, the better the economy of secondary reheating.
It is understood that the secondary reheating technology is promoted and implemented under the background of comprehensively improving the efficiency of energy conversion and utilization, implementing the strategy of energy conservation and emission reduction, reducing the total coal consumption and optimizing the coal consumption structure in order to cope with greenhouse gas emissions and alleviate environmental pressure in China, aiming at building a more efficient new generation of thermal power generating units.
At that time, there was no precedent for a million kilowatt secondary reheat unit in the world. "Face ‘ There is no overall scheme design, boiler, steam turbine and other major equipment, and no control system ’ ‘ Three noes ’ Problems and major challenges, we organize relevant units to address ‘ The key technology of million kilowatt secondary reheating ’ Joint research was carried out, and 15 major and technical schemes, such as overall technical scheme, boiler scheme, steam turbine scheme, spring base scheme, secondary reheat DCS control strategy, temperature regulation mode and bypass control technology, steam turbine shafting stability and start-up mode, were repeatedly demonstrated and reviewed to ensure that key technologies are advanced and reliable. " Chen Xuwei said.
After the two units were put into production, the third-party test showed that the coal consumption of power generation was nearly 6 g/kWh lower than the best level in the world today, and 14 g/kWh lower than the average level of domestic conventional one-time reheat units, and the power generation efficiency was 47.82% and 47.95% respectively. " In three research reports released in 2015-2016, the International Energy Agency commented that the secondary reheat unit of Taizhou Power Plant is currently the most efficient coal-fired unit in the world.
"According to our statistics, in recent years, 65% of the units in the whole East China and South China have adopted the secondary reheat technology in the projects under construction or design." Zhang Shishan, Party Secretary and Deputy General Manager of Jiangsu Electric Power Co., Ltd., National Energy Group, said.
Up to now, there are 21 secondary reheat units under construction or put into use in China. "We are more optimistic about ‘ Belt and Road ’ If you can go out, the prospect of this technology will be broader. " Chen Xuwei said.
Take the lead in exploring ultra-low emission path
The secondary reheat unit has not only made remarkable achievements in improving efficiency, but also reduced the emission of atmospheric pollutants by 5 percentage points compared with the conventional one million units every year, and achieved ultra-low emission of soot, sulfur dioxide and nitrogen oxides.
Standing at the height of the factory, you can see the white gas rising from two giant chimneys and gradually melting into the sky. "Out of the chimney, water vapor accounts for the majority. If we raise its temperature, we can’t actually see anything. The control of pollutant discharge is mainly in three aspects: sulfur dioxide, nitrogen oxides and soot. Our sulfur dioxide emission level is about 10 mg/m, and the national standard is 35 mg/m, and we are fully capable of reducing this level to a lower level; Nitrogen oxides, the national standard is 50 mg/m, and our average annual emission level is about 38-39 mg/m; Smoke and dust, the national standard is 10 mg/m, and our current average operating level is 2 mg/m, far superior to the national ultra-low emission level. " Chen Xuwei introduced.
It is reported that as early as 2012, at the beginning of the design of the secondary reheat unit, Taizhou Power Generation Co., Ltd. took the lead in proposing the ultra-low emission technical route of "six power plants+single tower double cycle+wet electrostatic precipitation", which was the first project in China to meet the gas emission standard.
Construct a full coverage governance system for unorganized discharge, air control, wastewater control and noise control; The coal yard is closed and reformed in the form of dry coal shed and windbreak and dust suppression net; Take the lead in building wharf shore power system to realize "zero emission" of generator air pollutants during the ship berthing … …
Taizhou company has always taken green environmental protection as the premise of its work and actively explored the road of green development.
100% comprehensive utilization of solid wastes
In addition, Taizhou Power Generation Co., Ltd. insists on turning waste into treasure, actively expands the sales channels of fly ash, slag and gypsum, and actively implements the deep processing of fly ash. The products such as fly ash, slag and gypsum sold are widely used in roads, high-speed rail, bridges and municipal construction, etc., to achieve 100% comprehensive utilization of solid waste.
According to Chen Xuwei, in recent years, the sales profit of heating and solid waste of Taizhou Power Generation Co., Ltd. accounted for more than 20% of the total profit of the enterprise. In 2018, the sales of ash is 87 million, gypsum is franchised by another company, and the price of first-class ash has reached 230 yuan/ton.