Cogeneration control system and method

Abstract

The heat and power co-regulation control system and method disclosed in the present invention include an automatic control module for medium pressure and low pressure steam extraction pressure, respectively automatically adjusting the medium pressure steam extraction regulating valve and the low pressure steam extraction regulating valve according to the pressure of the medium pressure and low pressure steam extraction ports; The medium-pressure and low-pressure heating pressure automatic control module automatically adjusts the medium-pressure heating regulating valve and the low-pressure heating regulating valve according to the medium-pressure and low-pressure heating pressure; the automatic system realizes coordinated control, so that the heating unit It can operate normally in AGC and primary frequency regulation mode, and can ensure the safety of heating of the unit. Adoption of the present invention provides a control technology that solves the contradiction between the automatic regulation of power generation and the automatic regulation of heat supply existing in existing heat and power cogeneration units, which not only meets the assessment index requirements of the power grid for power supply quality of generator sets, but also ensures the safety of heat users. Safety.

Description

technical field [0001] The invention belongs to the technical field of industrial automation control in the technical field of coal-fired power generation, in particular to the combined heat and power regulation control technology of a heating unit. Background technique [0002] Combined heat and power has comprehensive factors such as saving energy, improving the environment, and improving the economic benefits of thermal power plants. More and more large-capacity thermal power units have gradually developed into combined heat and power units. However, the power grid assessment stipulates that "all generator sets with more than 100,000 million units should have AGC and primary frequency regulation functions". Since the change of electric load will affect the heat load, and the change of heat load will also affect the electric load, the greater the change of electric load, The greater the external heat supply flow, the greater the range of this fluctuation, which not only af...

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Problems solved by technology

[0004] (1) The main steam pressure, drum water level, and main / reheat steam temperature fluctuate greatly, and the unit’s combustion conditions are bad, endangering the safe operation of the unit

[0005] (2) The actual power generation of the unit cannot meet the AGC instruction of the power grid and the performance requirements of primary frequency regulation, and the monthly assessment of the power grid is serious

[0006] (3) External heat supply is unstable, which affects the safe production of heat users, and in severe cases leads to the scrapping of heat user products and equipment damage

[0007] (4) The combustion conditions of the unit vary greatly, which seriously affects the adjustment of the automatic system of denitrification, resulting in the unstable control of NOX, and the pressure of environmental protection monitoring and assessment

[0008] 2. Only put in the power supply automatically: the above problems also exist

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