A method for quickly stabilizing the main steam temperature when using automatic grid frequency regulation
A main steam temperature, power grid technology, applied in lighting and heating equipment, combustion control and other directions, can solve problems such as reducing the service life of the unit, reducing the thermal stress of the boiler metal, and affecting the economic indicators.
Active Publication Date: 2017-01-04
STATE GRID CORP OF CHINA +1
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Problems solved by technology
If the main steam temperature is too high, it will reduce the thermal stress of the boiler metal and reduce the service life of the unit; if the temperature is too low, it will reduce the thermal efficiency of the cycle and affect the economic index
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[0021] Using the original control method, the deviation between the main steam temperature and the corresponding design value of the main steam temperature can be kept at ±12°C. However, by adopting the method of the present invention, the adjustment rate of coal feeding in the upper layer is slowed down, and the deviation between the actual temperature and the design value is reduced to ±6°C. Taking two 300MW units as an example, the temperature reduction effect after the increase is equivalent to saving 0.05g of standard coal / kWh, according to the annual power generation of 3.94 billion kWh, the two units can save 196 tons of standard coal a year. Based on the calculation of 600 yuan per ton of standard coal, two 300MW units can save about 120,000 yuan a year.
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The invention relates to a method of quickly stabilizing main steam temperature in power grid frequency modulation. The method includes: before a coal feed quantity instruction is distributed to three tiers of coal mills, adding rate limit modules to the three tiers of coal mills to limit change rate of pulverized coal quantity, and setting a maximum rate of 300 / min in the pulverized coal quantity change rate limit modules in the middle and lower tiers of coal mills, and setting a maximum rate from 50 / min to 100 / min in the rate limit module of the upper tier of coal mill. The pulverized coal feed rate of the upper tier of coal mill is slowed down, changes in radiant heat generated by combustion are small, and amplitude of changes in the main steam temperature can be decreased.
Description
technical field [0001] The invention belongs to the technical field of thermal power unit control, in particular to a method for quickly stabilizing the temperature of main steam when frequency regulation of a power grid adopts an automatic mode. Background technique [0002] As a kind of clean energy, electric energy is widely used. Power generation companies and power consumption companies are connected to the grid. Power generation companies continuously send power to the grid, while power consumption companies consume electricity from the grid. Electric energy cannot be stored, so in order to ensure the balance of supply and demand, the stability of electric energy frequency must be achieved, that is, the reliability of peak regulation and frequency regulation. With the rapid development of the economy, the problem of environmental pollution is becoming more and more serious, and the demand for energy saving and consumption reduction is becoming stronger and stronger. W...
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IPC IPC(8): F23N5/00
Inventor 赵毅杨鑫
Owner STATE GRID CORP OF CHINA