Method and system for controlling load-shedding working condition of supercritical unit

A technology of supercritical unit and control method, which is applied in the direction of control system, lighting and heating equipment, steam generation, etc., which can solve the problems of unit equipment damage, hidden dangers of power grid stable operation, etc., and achieve the effect of preventing stress damage

Inactive Publication Date: 2012-08-01
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a supercritical unit load shedding control method and system for the above-mentione

Method used

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  • Method and system for controlling load-shedding working condition of supercritical unit
  • Method and system for controlling load-shedding working condition of supercritical unit
  • Method and system for controlling load-shedding working condition of supercritical unit

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example 1

[0045] Example 1. Overview of 50% load shedding control of a 600MW supercritical unit in a power plant:

[0046] A 600MW supercritical unit is controlled by the supercritical unit load rejection control method of the present invention after shedding 50% of the load. The main steam pressure in the boiler is up to 15.84MPa without overpressure; the main steam temperature is stable and the lowest is 551°C , no overheating; the feed water flow rate is stable; the reheat steam pressure and fluctuation range are 2.13-2.07MPa, within a reasonable range, and the steam temperature is stable; other furnace side parameters are normal, the induced draft fan does not jump out of the automatic, and the primary fan does not surge.

[0047] Figure 2 to Figure 5 Shows the data change status in the control process.

[0048] figure 2 It is a schematic diagram of the load change curve with time after the unit sheds 50% of the load. From 19:27:15 to 19:27:50, the unit load changes from 300MW t...

example 2

[0052] Example 2. Overview of 100% load shedding control of a 600MW supercritical unit in a power plant

[0053] A 600MW supercritical unit, after 100% load rejection, is controlled by the supercritical unit load rejection control method of the present invention, the main steam pressure in the boiler is up to 25.64MPa, no overpressure; the main steam temperature is stable and the lowest is 543°C , not over-temperature; feed water flow rate is stable; reheat steam pressure and steam temperature are stable; other furnace side parameters are normal, the induced draft fan does not jump out of automatic, and the primary fan does not surge.

[0054] Figure 6 ~ Figure 9 Shows the data change status in the control process.

[0055] Image 6 It is a schematic diagram of the load change curve with time after the unit sheds 100% load. From 21:32:50 to 21:33:07, the unit load changes from 600MW to 0MW, 100% load shedding, and then maintains.

[0056] Figure 7 It is a schematic diagr...

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Abstract

The invention provides a method for controlling a load-shedding working condition of a supercritical unit. The method comprises the following steps of: when the load-shedding working condition is detected, starting an ignition system and operating a set quantity of powdering systems; reducing the total coal quantity of a boiler to rated fuel quantity for maintaining pressure and combustion stability, and supplying water of which the quantity corresponds to the total coal quantity; and opening a high-pressure bypass and a low-pressure bypass, adjusting the openness of the high-pressure bypass and the openness of the low-pressure bypass according to a unit load, and controlling the pressure of the boiler to return to a normal state. Moreover, the invention also provides a system corresponding to the method. By the method and the system for controlling the load-shedding working condition of the supercritical unit, when the load-shedding working condition of a generator unit occurs, steam in the boiler is scientifically and reasonably discharged by bypass control, the boiler can safely and stably operate, stress damage to the metal of the unit is reduced, and safety in power supplying of a power grid is ensured.

Description

technical field [0001] The invention relates to the control technology of the load rejection working condition, in particular to a control method and system for the load rejection working condition of a supercritical unit. Background technique [0002] A load shedding accident is an accident phenomenon in which a turbogenerator unit suddenly unloads all or part of its load. The load shedding of the steam turbine generator set will lead to various problems, such as: due to the sudden trip of the power transmission and transformation line, the unit load cannot be output normally; the generator protection action, the generator outlet switch trips; Sudden closing of the main steam valve; sudden closing of an automatic main steam valve, governor valve or oil motor during operation. [0003] At present, the use of supercritical units has become more and more common. The occurrence of load shedding accidents of supercritical units has a great impact on the safe and stable operatio...

Claims

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Application Information

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IPC IPC(8): F22B35/00
Inventor 殷立宝徐齐胜崔振东
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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