Optimization method of high back pressure heat supply for thermal power units

Abstract

The invention discloses a high-back pressure heating optimization method for a thermal power unit. The method is: when two units in a thermal power plant are connected in series with high back pressure for heating, the current 1# unit exhaust volume, 2# unit exhaust volume, cycle Under the condition of water volume and return water temperature, the back pressure of 1# and 2# units is optimized collaboratively to ensure the water supply temperature. Specifically, first optimize the operation of the 1# unit under the best back pressure, and adjust the back pressure of the 2# unit to the most economical back pressure to ensure the water supply temperature; if the back pressure of the 2# unit is p c2 has been adjusted to the highest back pressure p c2max If it still cannot meet the water supply temperature requirements, the 2# unit maintains the highest back pressure operation, and adjusts the 1# unit back pressure to the most economical back pressure to ensure the water supply temperature; the invention provides two units of the high back pressure series heat supply optimization method, Under the condition of maintaining heat supply, the power generation is maximized and the energy consumption for heating is minimized.

Description

technical field [0001] The invention relates to a heat supply optimization method for a thermoelectric unit, in particular to an optimization method for maximizing power generation and minimizing heating energy consumption when a thermoelectric unit supplies heat with high back pressure. Background technique [0002] Central heating of thermal power plants is the main heating method in cities and towns. In the early and late cold periods, thermal power plants generally operate with high back pressure for heating, and increase the exhaust pressure of the steam turbine to increase the exhaust heat for heating. Heat is a heating mode with less energy consumption. [0003] At present, thermal power plants are operated with constant back pressure when supplying heat with high back pressure. Generally, the back pressure is designed to be 28-32kPa. The design high back pressure is basically unchanged during operation, and the unit back pressure is not optimized online in real time ...

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Problems solved by technology

[0003] At present, thermal power plants operate at constant back pressure when they supply heat with high back pressure. The general back pressure design is 28-32kPa. During operation, the designed high back pressure remains basically unchanged, and the unit back pressure is not optimized online in real time according to the requirements of the water supply temperature. Especially when two units in a thermal power plant are connected in series with high back pressure for heat supply, how to coordinately optimize the back pressure of the two units has not yet been reported.

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