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Optimization method and system for unit sliding pressure control based on thermoelectric load conditions

An optimization method and electric load technology, applied in the direction of general control system, control/regulation system, adaptive control, etc., can solve the problems of unit economic reduction, deviation, and inability to apply heat and power cogeneration units, etc., to achieve wide applicability, The effect of improving economy

Active Publication Date: 2022-04-22
浙江浙能绍兴滨海热电有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Before and after the change of heating and extraction steam volume, there is a large gap in the optimal main steam pressure corresponding to the same electrical load. Using the original sliding pressure curve to control the main steam pressure will cause obvious deviations, which will lead to economical failure of the unit. decline, so the original sliding pressure operation curve can no longer be used in new working conditions
Therefore, the sliding pressure curve of the traditional pure condensing unit is no longer applicable to the widely used combined heat and power unit. The unit control system searches for the main steam pressure according to the original design sliding pressure curve, which will cause the problem of lower economic efficiency of the unit.

Method used

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  • Optimization method and system for unit sliding pressure control based on thermoelectric load conditions
  • Optimization method and system for unit sliding pressure control based on thermoelectric load conditions
  • Optimization method and system for unit sliding pressure control based on thermoelectric load conditions

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Effect test

Embodiment 1

[0113] A real-time optimization method for unit sliding pressure control strategy based on thermal and electrical load conditions, taking a 300MW cogeneration unit in a power plant as an example, includes the following steps:

[0114] Step S1, as attached image 3 As shown in the flow chart, the conversion relationship model of unit thermal load converted into electrical load under different loads is established.

[0115] S11, from the effective operating load range of the steam turbine (30%-100%), select a load every 5%, and select the working conditions of 30%, 35%, 40%, ..., 95%, 100% load as the test Load, the corresponding electric load is 90MW, 105MW, ..., 300MW.

[0116] S12, take the test condition of a load in S11, denoted as condition 0, and use the heat balance simulation software of the thermal system to establish a simulation model of the pure condensing power generation condition under this load.

[0117] S13, the 300MW unit shown in this embodiment has three s...

Embodiment 2

[0159] On the basis of the above-mentioned embodiment 1, this embodiment also provides a system for optimizing the sliding pressure control of the unit based on thermal and electrical load conditions, including:

[0160] The input module is used to obtain the real-time operation data of the cogeneration unit;

[0161] The constraint module is used to limit the range of independent variables of the algorithm in the optimization module and improve the efficiency of optimization according to the characteristics of the heating network and power grid dispatching, as well as the heat balance relationship during the operation of the unit. The constraint module includes: real-time The main steam pressure range constraint module of main steam parameters, the thermoelectric load range constraint module based on the dispatching characteristics of the heating network and power grid, and the range constraint module of other independent variables based on mass conservation and heat balance r...

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Abstract

The invention discloses a method and system for optimizing unit sliding pressure control based on thermal and electrical load conditions, which includes: step S1, establishing a conversion relationship model for converting thermal load of the unit into electrical load; and step S2, establishing thermal and electrical load and main steam pressure optimization A mapping model between values; step S3, real-time rolling optimization of the main steam pressure based on the mapping model combined with actual operating parameters; step S4, output the optimization result to the unit control system to control the operation of the unit. The present invention proposes a unit sliding pressure control optimization method and system based on thermoelectric load conditions, which takes heat supply into consideration, comprehensively considers multivariate sliding pressure operation strategies such as thermoelectric load and main steam parameters, and performs real-time optimization.

Description

technical field [0001] The invention relates to a method and system for optimizing sliding pressure control of a unit based on thermoelectric load conditions, and belongs to the technical field of intelligent operation of thermal power generating units. Background technique [0002] At present, with the development of new energy power generation technology, due to the influence of power grid peak regulation, thermal power generating units need to be in variable load operation for a long time, so most of the large thermal power generating units in my country adopt sliding pressure operation to cope with power consumption. Changes in load demand. At the same time, my country has vigorously developed cogeneration units, combining the two energy industries of power supply and heating, realizing cascade utilization of energy, and improving energy utilization and economy. [0003] When the unit is running under sliding pressure, each load condition has a corresponding main steam p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04F01K17/02F01D21/00
CPCG05B13/042F01K17/02F01D21/00
Inventor 洪方驰孙海龙严小华任庆周懿
Owner 浙江浙能绍兴滨海热电有限责任公司
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