Fuel-water ratio control method for supercritical and ultra supercritical unit

An ultra-supercritical unit and control method technology, which is applied in the combustion method, combustion control, and fuel supply adjustment, etc., can solve the problems that affect the stability of the unit, have a large impact, and the variable load rate is difficult to achieve, and achieve system stability. The effect of unaffected, stable main steam temperature

Inactive Publication Date: 2011-06-29
JIANGSU FRONTIER ELECTRIC TECH +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the unit adopting Scheme 2, although the feedwater flow can adjust the steam temperature faster, it also has a greater impact on the load and pressure of the unit. When there is a deviation in the middle point temperature, the correction effect on the feedwater side will often be coupled with the coordinated control, affecting Unit stability
Therefore, the coordina

Method used

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  • Fuel-water ratio control method for supercritical and ultra supercritical unit
  • Fuel-water ratio control method for supercritical and ultra supercritical unit
  • Fuel-water ratio control method for supercritical and ultra supercritical unit

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Embodiment Construction

[0039] Two 660MW supercritical units in a power plant adopt the control scheme of this patent, and the specific parameters are set as:

[0040] Feed water side temperature regulator PID1:

[0041] Fuel side thermostat PID2:

[0042] The two-order inertia link of BMD→FWD:

[0043] The two-order actual differential link in the decoupling loop from the PID regulator on the water supply side to the fuel command:

[0044]

[0045] Water supply side correction threshold dbw: 4.0;

[0046] Water supply side correction gain Kw: 0.2;

[0047] The actual differential link to calculate the rate of change of temperature difference at the intermediate point:

[0048] The function F1(x) of BMD→FUD:

[0049] BMD

0

240

320

400

460

540

600

660

750

F1(x)

0

96.48

128.64

160.8

185.84

219.24

244.2

269.28

306

[0050] The function F2(x) of BMD→FWD:

[0051] BMD...

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Abstract

The invention discloses a fuel-water ratio control method for a supercritical and ultra supercritical unit, and provides a novel fuel-water ratio control method in which fuel quantity and feed water flow simultaneously play parts in intermediate point temperature correction. The method comprises the following steps of: defining a fuel-water ratio distribution coefficient; correspondingly adjusting the magnitude of the fuel-water ratio distribution coefficient according to intermediate point temperature difference and deviation variation of the temperature difference; and determining instruction values of the fuel quantity and the feed water flow to keep control overall gain of an entire fuel-water ratio adjusting system unchanged and keep the system stability not influenced. Meanwhile, a decoupling loop from a water feed side correcting value to a fuel side is further added in a control logic, so that the load on the unit and the disturbance of steam pressure brought by adjustment of the fuel-water ratio by the feed water flow can be greatly eliminated. Actual system application shows that the supercritical (ultra supercritical) unit using the control method can more effectively adjust the fuel-water ratio during running of the unit, and has more stable variation in main steam temperature and main steam pressure while loading rate quickly varies.

Description

technical field [0001] The invention relates to an improved method for controlling the fuel-water ratio in a coordinated control system of a super (super) critical unit, belonging to the fields of thermal power engineering and automatic control. Background technique [0002] The fuel-water ratio control of super (super) critical units is an important part of the coordinated control of the machine and boiler in the DCS (distributed control system) of the unit. The control performance of this part directly affects the stability of the main steam temperature, main steam pressure and variable load ability. At present, domestic and foreign super (super) critical units generally use the deviation of the intermediate point temperature (usually the outlet temperature of the boiler steam-water separator) to correct the unit fuel quantity command or feed water flow command in the fuel-water ratio control, so as to re-match the fuel-water ratio and stabilize For the purpose of main st...

Claims

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Application Information

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IPC IPC(8): F23N1/08
Inventor 陈雨亭吕剑虹丁建良高绥强蔡奇新
Owner JIANGSU FRONTIER ELECTRIC TECH
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