Energy-saving quick power regulating system of thermal generator set and method

Abstract

Disclosed are an energy-saving quick power regulating system of a thermal generator set and a method. The system comprises a distribution type control system, a PLC (programmable logic control) unit and a low-pressure heater condensate bypass regulating system, the PLC unit is connected with the distribution type control system by a bidirectional interface, and the low-pressure heater condensate bypass regulating system is in communication connection with the PLC unit. The method includes that opening of a bypass regulating valve is reduced by the PLC unit when load needs to be quickly added, and the opening of a fully opened high-pressure regulating valve is reduced by the PLC unit via the distribution control system when the load needs to be reduced quickly. Unnecessary loss is avoided on the premise of guaranteeing safety and stability of the system, the requirement of a power grid on power regulating speed of the set is met, and quick power regulation and economical running of the thermal generator set are realized.

Description

technical field [0001] The invention relates to the technical field of control of thermal power generating sets, in particular to an energy-saving fast power adjustment system and method for thermal generating sets. Background technique [0002] The basic function of the power system is to maintain the balance of power load and power generation. my country's power load fluctuates violently, and its "peak-to-valley ratio" is 5-10 times that of Western countries; in addition, the energy storage function of my country's power grid is seriously insufficient, which makes Generating sets in my country's power system must frequently and significantly adjust power generation to adapt to large fluctuations in power load and ensure the quality of power supply. At present, most of the power supply load adjustments in my country are completed by thermal power units. Therefore, the power adjustment range and speed of thermal power units have an important impact on the safety and stability...

AI Technical Summary

Problems solved by technology

Solution 1 will inevitably destroy the flow balance of the steam-water circuit when changing the condensate flow rate, resulting in changes in the water level of the hot well of the condenser and the water level of the deaerator. The water levels of these two devices are crucial to ensure the safe and stable operation of the unit , this scheme can only be used to a limited extent, and it is difficult to ensure the safety and stability of the unit after multiple adjustments; the reheater desuperheating water in scheme two is mainly used to adjust the steam temperature at the outlet of the reheater, and when it participates in power adjustment, it will affect the reheater The temperature level of the outlet steam has relatively strict requirements, otherwise the change of the sprayed water flow rate will easily cause the reheater to overheat or fluctuate greatly, causing damage to the key equipment of the generator set, so it is difficult to adopt in actual operation; A regulating valve is set on the steam extraction pipeline of the unit, and the regenerative steam extraction volume is forced to be reduced when the power of the unit needs to be increased, so that this part of steam enters the steam turbine to do work, but at the same time, the reduction of the regenerative steam extraction volume has a very large impact on the regenerator Disturbance can cause large changes in its internal pressure and temperature, far exceeding the design requirements for safe operation of the regenerator equipment, threatening the safety of the regenerator, and seriously reducing the life of the regenerator

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