Thermoelectric unit high-back-pressure heat supply optimization method

Abstract

The invention discloses a thermoelectric unit high-back-pressure heat supply optimization method. The method is characterized in that when two units of a thermal power plant are connected in series for heat supply under high back pressure, the back pressure of a first unit and the back pressure of a second unit are collaboratively optimized under the current steam exhaust amount of the first unit, the current steam exhaust amount of the second unit, the current circulating water amount and the current water return temperature, and the water supply temperature is guaranteed. The method comprises the steps that firstly, the first unit is optimized to operate under the optimal back pressure, and the back pressure of the second unit is adjusted to the most economical back pressure for guaranteeing the water supply temperature; and if the water supply temperature requirement still cannot be met when the back pressure pc2 of the second unit is adjusted to the highest back pressure pc2max, the second unit maintains the highest back pressure operation, and the back pressure of the first unit is adjusted to the most economical back pressure for guaranteeing the water supply temperature. According to the two-unit high-back-pressure series heat supply optimization method, under the condition of heat supply guaranteeing, the generating capacity is maximized, and heat supply energy consumption is minimized.

Description

technical field [0001] The invention relates to a heat supply optimization method of a thermoelectric unit, in particular to an optimization method for maximizing power generation and minimizing heating energy consumption when a thermoelectric unit is providing heat under high back pressure. Background technique [0002] Centralized heat supply by thermal power plants is the main heat supply method for cities and towns. In the early and late cold periods, thermal power plants generally adopt high back pressure operation for heat supply, and increase the exhaust steam pressure of steam turbines to increase the heat supply of exhaust steam. Heat is a heating mode that consumes less energy. [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 ...

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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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