Automatic control method for converting thermal power generation unit in start-up and load increasing stage into dry state operation

Abstract

The invention discloses an automatic control method for converting a thermal power generation unit in a start-up and load increasing stage into dry state operation. The automatic control method comprises the following steps that 1) the fuel amount and the water supply amount are increased during the start-up and load increasing process of the thermal power generating unit, so that the load of theunit is increased to 30% of the rated load; 2) after the load of the unit rises to 30% of the rated load, the total water supply amount is kept unchanged; 3) preset time is set; 4) waiting is carriedout until the preset time is reached; 5) whether to be converted into the dry state operation or not is judged; 6) whether the temperature rising rate of saturated steam is too slow or too fast or notis judged; 7) the coal feeding amount is automatically increased in a first specified time period, and whether the coal feeding amount is continuously increased or not in a second specified time period is judged; and 8) the coal feeding amount is automatically reduced in a third specified time period, and then whether the coal feeding amount is continuously reduced in a fourth specified time period or not is judged. By using the automatic control method for converting the thermal power generation unit in the start-up and load increasing stage into the dry state operation, the fuel amount andthe water supply amount can be automatically controlled so that the thermal power generation unit can be relatively quickly converted into the dry state operation in the start-up and load increasing stage.

Description

technical field [0001] The invention relates to an automatic control method for a thermal power generating set to turn to a dry state during the start-up and load-up stages. Background technique [0002] The control of the process of turning to dry state at the start-up stage of the traditional thermal power generation unit is to manually observe the temperature rise of saturated steam by the operating personnel, and increase or decrease the amount of fuel and water supply by manual operation according to the observed situation and subjective judgment. Adopting this method not only has a large labor intensity for operating personnel, but also the control of the process of turning to dry state is very unstable, which affects the safety and economical efficiency of unit operation. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects existing in the prior art, and to provide a method that can...

AI Technical Summary

Problems solved by technology

Using this method not only requires labor-intensive operation of the operator, but also the control of the dry state process is very unstable, which affects the safety and economy of the unit operation.

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