Calculation system and method for feasible operation interval of heat and power cogeneration unit under power constant

Abstract

The invention discloses a system for calculating a feasible operation range of a BHKW under the condition of ordering power by heat. The system comprises a data collecting and analyzing module, a working condition changing calculating module, a working condition graph module and a peak adjusting load reading module which are sequentially connected, wherein the data collecting and analyzing module reads operation data from a power plant DCS and obtains a representation actual operation benchmark working condition point through the clustering methodology method, and the working condition changing calculating module carries out working condition changing calculation based on the equivalent enthalpy drop method, extracts a working condition changing characteristic according to the optimum square approach method of a continuous function and obtains an actual operating working condition curve of the BHKW. The working condition graph module is obtained according to a working condition changing characteristic curve. The peak adjusting load reading module intelligently calculates the feasible operation range of a peak adjusting load from a working condition graph based on a database. The invention further provides a method for calculating the feasible operation range through the system. The system and method can be used for carrying out operation calculation of a large combined heat and power generation single drawing unit and a large combined heat and power generation double-drawing unit, and a heat supply unit is arranged to adjust the peak, so that thermal power plant and power grid dispatching is greatly facilitated.

Description

technical field [0001] The invention relates to an intelligent calculation system for the feasible operation range of a large heat and power cogeneration unit under the condition of "power is determined by heat". The invention also relates to a method for calculating the feasible operating range of a large heat and power cogeneration unit under the condition of "setting power by heat" by using the system. Background technique [0002] With the development of small and medium-sized cities, economic development zones, and industrial parks in China, as well as the improvement of energy conservation and environmental protection requirements, combined heat and power units have developed rapidly in recent years due to their obvious energy-saving effects. From traditional industrial self-provided thermal power plants to regional Centralized heating and thermal power plants have formed a certain scale, and their proportion in the grid continues to increase. At the same time, with t...

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Problems solved by technology

[0004] 1. Most of the research on the working condition diagram is based on the calculation of the design working condition. With the passage of operation time and the overhaul and transformation of the unit, the heating and extraction working condition diagram given by the original design of the unit can no longer reflect the actual operation of the unit. Therefore, the load feasible operating range obtained from the original working condition diagram cannot accurately reflect the actual peak-shaving capacity of the unit;

[0005] 2. Since all kinds of combined heat and power units operate under the condition of constant heat and electricity, the feasible operating range of the real-time economic operation of the units cannot be determined

At present, cogeneration units generally operate at more than 70% load, which intensifies the peak-shaving pressure of the power grid. However, if the operating conditions of the thermal power plant are not considered, arbitrarily arranging heat-supply units to participate in peak-shaving may damage the interests of the thermal power plant.

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