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System and method for improving primary frequency modulation performance of reheating unit

A technology for reheating units and thermal systems, applied to mechanical equipment, steam engine devices, engine components, etc., can solve the problems of volume inertia delay in reheating systems, achieve short paths, low cost, and improve the performance of primary frequency regulation

Pending Publication Date: 2022-04-01
SHANDONG ZHONGSHI YITONG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The change of steam produced after one frequency adjustment action of the unit has an instantaneous influence on the output of the high-pressure cylinder, but the influence on the output of the medium and low-pressure cylinders is delayed by the volume inertia of the reheating system

Method used

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  • System and method for improving primary frequency modulation performance of reheating unit
  • System and method for improving primary frequency modulation performance of reheating unit
  • System and method for improving primary frequency modulation performance of reheating unit

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1 of the present disclosure introduces a system for improving the primary frequency regulation performance of a reheat unit.

[0044] Such as figure 1 A system for improving the performance of primary frequency regulation of reheating units is shown, including superheater 1, high-pressure cylinder 2, reheater 3, medium-pressure cylinder 4, low-pressure cylinder 5, reheat system cold section steam main pipe 6, reheat Steam bypass pipe 7, regulating valve 8, steam main pipe 9 in the hot section of the reheating system, connecting pipe 10 and main steam main pipe 11 of the unit.

[0045] As one or more implementations, the cold section pipeline 6 of the reheat system is used to connect the high pressure cylinder 2 and the reheater 3 , and the hot section pipeline 9 of the reheat system is used to connect the reheater 3 and the medium pressure cylinder 4 .

[0046] As one or more implementations, one side of the high-pressure cylinder 2 is connected to the super...

Embodiment 2

[0051] Embodiment 2 of the present disclosure introduces a method for improving the primary frequency regulation performance of a reheating unit.

[0052] Such as figure 2 A method for improving the primary frequency regulation performance of the reheating unit shown includes the following steps:

[0053] Obtain the actual speed and rated speed of the steam turbine of the unit, and obtain the speed difference;

[0054] Determine the opening of the regulating valve according to the speed difference to adjust the load of the unit

[0055]As one or more implementations, according to the maximum load variation of primary frequency regulation is 6% of rated power, the capacity of the reheat steam bypass system can be designed according to 12% of the rated flow of reheat steam.

[0056] The control logic of the reheat steam bypass flow regulating valve V is added to the DCS, and the opening of V is a schematic diagram of the function relationship of the steam turbine speed differ...

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Abstract

The invention belongs to the technical field of thermal power generating unit control, and provides a system and method for improving the primary frequency modulation performance of a reheating unit, and the system comprises a reheating steam bypass pipeline arranged between a reheating system cold section pipeline and a reheating system hot section pipeline, and a regulating valve arranged on the reheating steam bypass pipeline; acquiring actual rotating speed and rated rotating speed of the unit turbine to obtain rotating speed difference; determining the opening degree of a regulating valve according to the rotating speed difference, and regulating the unit load. According to the invention, the inertia-free reheat steam bypass system is arranged, so that the steam variation of the primary frequency modulation avoids the inertia delay of the reheat system, and the output of the medium-pressure cylinder and the low-pressure cylinder is influenced as soon as possible, so that the response performance similar to that of a non-reheat unit is obtained.

Description

technical field [0001] The disclosure belongs to the technical field of thermal power unit control, and in particular relates to a system and method for improving the primary frequency regulation performance of a reheating unit. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In order to obtain high efficiency and low energy consumption, thermal power units are developing in the direction of large capacity, high parameters and double reheating units. However, large capacity, high parameters, and secondary reheating also increase the inertia of the reheating system of the unit, which reduces the performance of the unit's primary frequency regulation and cannot well meet the requirements of the "two detailed rules" for power grid dispatching. In building a power system with new energy as the main body, the frequency regulation function of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/10F01D17/06F01K7/24
Inventor 部俊锋韩庆华杨锋吴迪刘希健王子奇丛壮李林
Owner SHANDONG ZHONGSHI YITONG GRP
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