Reasons for coal-fired units participating in peak shaving


Release Time:

2021-11-24

Due to the relatively low installed ratio of combined power sources such as pumped storage, hydropower storage, and gas turbine units, the peak shaving capability of using this method is far from sufficient. Therefore, for a long period of time, the use of large capacity coal-fired units remains a major energy source involved in grid peak shaving.

Reasons for coal-fired units participating in peak shaving

Due to the relatively low installed ratio of combined power sources such as pumped storage, hydropower storage, and gas turbine units, the peak shaving capability of using this method is far from sufficient. Therefore, for a long period of time, the use of large capacity coal-fired units remains a major energy source involved in grid peak shaving.

In the process of planning the energy structure of the power grid, the power source of its load is maintained constant, generally composed of coal-fired or nuclear power units with relatively large capacity and hydropower units with sufficient water volume. The power load can also change at any time, and this cycle is relatively long, generally consisting of hydropower units with load regulation capabilities and coal-fired units with higher efficiency. When the power load fluctuates greatly and the duration is relatively short, it can be composed of pumped storage power plants with fast startup and shutdown speed and strong load regulation capacity, as well as some gas turbines and hydropower units,

Currently, the use of hydropower units is an effective means to solve peak load regulation in the power grid. Against the background of rapid growth in installed capacity of hydropower units, the use of hydropower has been at a relatively low level due to environmental protection, immigration, ecological and seasonal factors. Currently, only 16% of the electricity generated by hydropower units is far from meeting the requirement of adjusting the peak valley by more than 30%, so it is necessary to use coal-fired units to participate in peak shaving.

Pumped storage power stations have a dual role of sweet water and peak shaving, with a relatively large range of wind regulation. However, from the data, it can be seen that in recent years, the number of units in pumped storage power stations has increased year by year, but the proportion is still low. Therefore, adopting gas steam combined cycle power plants is an effective measure to solve peak shaving. Compared with gas fired power plants of the same capacity, it has lower costs, shorter construction cycles, smaller floor space, less water consumption, and high heat efficiency. Moreover, it is very convenient to start or stop, and can be suitable for intermediate loads.

From a long-term perspective, to solve the problem of peak shaving, we need to vigorously build pumped storage power station cycle units based on needs, and quickly build networking to make full use of the vast geographical area, with seasonal differences between the north and south of the staggered peak. In a short period of time, it is difficult to achieve large-scale development of gas turbine units. From this, it can be seen that the means of peak shaving in the power grid are still lacking, and there is a relatively large contradiction with the objective peak shaving. Currently, participating in peak shaving is an inevitable trend for coal-fired power plants to adapt to the operation of the electricity market and achieve competitive bidding for grid access. It is necessary to tap the peak shaving potential of coal-fired power units, and carry out adaptive modifications to the units, thereby providing more peak shaving capacity for the grid, accepting renewable energy, and creating better conditions.

 

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We specialize in the research and development and production of clean heating products such as solid electric energy storage heating devices, high-voltage electrode boilers, air waste heat recovery machines, electric coal substitutes, wind power heating, and peak shaving.

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