Natural gas power generation avoids shorting

The Jiangsu Provincial Development and Reform Commission released the "Jiangsu Province 2012 Major Project List" on February 9th. Huadian Yangzhou Natural Gas Power Project, Wuxi East Asia Natural Gas Power Project, and Huadian Qishuyan Natural Gas Power Generation Project are all included in it, which also confirms that the "National Energy Administration issued a document Agrees that Jiangsu Huadian Yangzhou Gas Turbine Project (2×400,000 kilowatts), Huadian Qishuyan Gas Turbine Expansion Project (2×400,000 kilowatts), East Asia Electric Power Wuxi Gas Turbine Project (2×400,000 kilowatts) "Pre-work" report. It is reported that this project is the first phase of the “Twelfth Five-Year Plan” natural gas power generation peaking project initiated by the state.

In the case of nuclear power development affected by the nuclear accident in Fukushima, Japan, and uncertainty in the impact of hydropower on the effects of drought, renewable energy such as wind power and solar energy will be difficult to be developed in large scale in the near future and effective power resources will be formed. Natural gas power generation may cause strained power The situation is "shady."

Gas power is full of red In recent days, the China Electricity Council released "National Power Industry Statistics Express (2011)" shows that in 2011 the national power engineering construction completed investment of 371.2 billion yuan, down 6.5% over the previous year. Among them, thermal power investment dropped sharply by 26.90%, from 104.2 billion yuan in 2010 to 105.4 billion yuan, and coal-fired power (including coal gangue) infrastructure installed capacity dropped by 980,000 kilowatts, a decrease of 1.8%.

However, conventional gas power has “risked against the trend,” and all gas and power indicators in the Express have been “full of red,” and the contrast between the booming scene and the overall trend of thermal power is clear. The installed capacity of full-diameter gas-fired power stations reached 32.65 million kilowatts in 2011, an increase of 23.57% from 26.42 million kilowatts in 2010; the total gas-fired generating capacity was 104.8 billion kwh in 2011, an increase of 35.2% over the same period of last year; The increase in installed capacity reached 108.9% to 2.59 million kilowatts.

"It is always the light of gold." Natural gas power generation achievements are naturally the outward manifestation of its own advantages.

There is no diamond drill or ceramics. Compared to the common power production methods such as coal, electricity, and hydropower, people's understanding of gas power and the degree of concern are dwarfed. In fact, natural gas power generation has a huge advantage, which is exactly the main reason for its popularity.

The high power generation efficiency makes natural gas power generation highly respected. According to the data from the Jiangsu Provincial Development and Reform Commission, "E~F-class gas turbine combined cycle power generation efficiency can reach 52~58%, which is much higher than today's most advanced large-scale coal-fired unit 45%~47% of power generation efficiency" and natural gas power generation as a kind of Clean and high-quality energy is right in the midst of China's severe environmental protection situation. Compared with coal-fired electricity, natural gas power generation does not produce solid particulate matter such as dust, and almost no sulfur dioxide emissions, while carbon dioxide emissions can be reduced by 58%, nitrogen oxides reduction is more than 80%, can be significantly eased Increasing environmental pressures.

Natural gas power generation is flexible in operation and the unit starts quickly. It becomes a good choice for power peaking. It takes 2 hours for the general E-class unit to start up to full output when it is cold, and the coal-fired unit will be between 6 hours and 8 hours.

The "Twelfth Five-Year Plan" Research Report of the Electric Power Industry (hereinafter abbreviated as "Report") issued by the China Light and Power International Co., Ltd. states: "The natural gas generating units are flexible in operation, and they are quick to start and stop quickly. They are mainly responsible for peak-sharing tasks in the power grid."

Zeng Ming, professor of North China Electric Power University, said that the development of natural gas power generation is different in different regions and provinces in China. The reasons for the changes in installed capacity, power generation capacity and newly installed capacity are also different. “Generally speaking, the growth of natural gas power generation last year was due to the fact that the problem of peak shaving in our country is still severe and the peak-to-valley difference is relatively large, and natural gas power generation is the best performing peak shaving. Nuclear power is the base load and does not participate in peak adjustment. For wind power, its instability cannot also play a role in peak load adjustment."

Where is the "short board"? "There is no shortage of gold, no one is perfect." The advantages of natural gas power generation are outstanding, but their shortcomings are equally evident. Higher on-grid tariffs and tighter gas sources are the “shortcomings” of natural gas power generation. Professor Zeng Ming believes that "on-grid tariffs and gas sources are still the major factors that restrict China's natural gas power generation."

“Substantially expensive”, China’s natural gas resources are relatively small, natural gas prices are naturally higher, and the resource distribution area is far from the load center. Natural gas power generation is also relatively high. For example, in Jiangsu Province, the on-grid electricity price of first-line natural gas from the West-East Gas Transmission Project is around RMB 0.60/kWh, and that of the West Second-line and Sichuan-East Gas Transmission Project is around RMB 2.20-2.30/m3, which is higher than the first line. Natural gas price, so the on-grid tariff will be raised accordingly; while the LNG power generation project has not yet explicitly agreed the price, but the initial estimate of LNG to the factory price of about 2.46 yuan / cubic meter, while the on-grid price will reach 0.72 yuan / kWh or so. The on-grid tariffs have exceeded the current on-grid price of coal-fired units with desulfurization benchmarks of 0.43 yuan/kWh (June 2011 data).

The relative shortage of resources and the limitation of gas sources have resulted in a relatively small amount of gas for power generation. From a global perspective, natural gas is mostly used for power generation, compared to the very low proportion of natural gas used to generate electricity in China. According to data from the Jiangsu Provincial Energy Administration, 60% of Japan's natural gas is used for power generation, accounting for 28% of its total domestic power generation; 31.2% of US natural gas is used for power generation, accounting for 21.5% of its total domestic power generation; South Korea's 44.6% of natural gas Used for power generation (2008 data). In contrast, China's natural gas is mainly used for industrial fuels (33.4%), chemical raw materials (25.7%), civilian (30.6%), and the proportion of natural gas used for power generation is only about 10.3% (2009 data). In fact, this type of consumption has reduced the utilization of natural gas, and the improvement of the environment has not been able to achieve the desired results.

Professor Zeng Ming stated that some provinces will invest more natural gas into more economical chemical industries instead of investing in power generation because of their own interests.

The capacity of the casks on the road to peak development is determined by the shortest wood. The choice of natural gas power generation model in China is also limited by its own disadvantages. The scale of natural gas power generation depends on the price competitiveness of natural gas. According to the current gas price level, it is necessary for the country to issue corresponding supporting policies to plan the layout of large-scale and large-scale natural gas generator sets. The "Report" predicts that China's large-scale natural gas power generation planning capacity in 2015 and 2020 will be 30 million kilowatts and 40 million kilowatts, respectively.

It can thus be seen that "moderately developing centralized natural gas power generation" as the guiding ideology for "12th Five-Year Plan" natural gas power generation not only depicts one of the future directions of natural gas power generation, but also shows China's confidence and prudence in the future natural gas power generation model.

The “Report” also stated that natural gas (including coalbed methane, etc.) power generation should be integrated with large, medium, and small scale; combined with the introduction of foreign pipeline natural gas and liquefied natural gas, large-scale gas generating units are planned and constructed in the receiving end area, mainly to solve the problems of nuclear power, wind power, and hydroelectric seasonal electricity. Grid peak pressure.

Given the outstanding advantages of natural gas power generation and the obvious “short board”, Prof. Zeng Ming also stated that China’s natural gas power generation “must not be able to concentrate on large-scale power generation but can only develop in the direction of peak regulation.”