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Primary frequency modulation method of single-shaft combined cycle unit of single-burning low heat value blast furnace gas

A combined cycle unit, blast furnace gas technology, applied in the direction of combined combustion mitigation, mechanical equipment, steam engine installations, etc., can solve the problems of low calorific value and difficult combustion stability.

Active Publication Date: 2017-08-11
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for one-time frequency modulation of single-shaft combined cycle units fired with low calorific value blast furnace gas. The characteristics of low combustion and unstable combustion, use the corrected load difference to adjust the angle of the gas compressor's full-range stator blades, so as to achieve the demand for primary frequency modulation load response, and meet the power grid's primary frequency modulation load response requirements for the unit Require

Method used

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  • Primary frequency modulation method of single-shaft combined cycle unit of single-burning low heat value blast furnace gas
  • Primary frequency modulation method of single-shaft combined cycle unit of single-burning low heat value blast furnace gas
  • Primary frequency modulation method of single-shaft combined cycle unit of single-burning low heat value blast furnace gas

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, it is a block diagram of the system operation principle of the single-shaft combined cycle unit applied in the present invention. The blast furnace gas is compressed by the multi-stage gas compressor 1 after dedusting and sent to the combustion chamber 2 for combustion, and then the gas turbine 3 does work. The gas turbine 3 The high-temperature exhaust gas is sent to the waste heat boiler to heat the feed water to generate steam, and then enters the steam turbine 4 to do work. The combustion air used in the combustion chamber 2 is supplied by the air compressor 5, and the gas flow can be adjusted by adjusting the angle of the full-range stator blade 7 of the gas compressor 1. The adjustment of the amount of combustion-supporting air is realized by adjusting the angle of the inlet guide vane 8 of the air compressor 5; when the gas compressor 1 is multi-stage, the adjustment of the gas amount is usually adjusted by the full-range vane of the fir...

Embodiment 2

[0048] The input terminal of the DCS distributed control system detects that the grid frequency is 50.073 Hz, and the angle of the entire stator blade is 62°. First, the required load response value is calculated to be -3MW, and the amplitude is less than 6MW. Therefore, the actual load response value is equal to -3MW. The output of the machine load regulator reduces the command of the full-range stator blade angle of the gas compressor, so that the full-range stator blade angle is reduced from 62° to 60.5°, and the corresponding actual adjustment value of the full-range stator blade angle is 1.5°. Unit load is reduced by 2.6MW within 30 seconds, with a maximum reduction of 3MW.

Embodiment 3

[0050] The input terminal of the DCS distributed control system detects that the grid frequency is 49.887Hz, and the angle of the stator blades throughout the process is 72.2°. First, the load response requirement value is calculated to be +6MW, and the amplitude is equal to 6MW. Therefore, the actual load response value is equal to +6MW. The output of the machine load regulator increases the command of the full-range stator blade angle of the gas compressor, so that the full-range stator blade angle is opened from 72.2° to 74.8°, and the corresponding actual adjustment value of the full-range stator blade angle is 2.6°. Unit load increases by 4.2MW within 30 seconds, with a maximum increase of 6.3MW.

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Abstract

The invention relates to the automatic control field of power plants, particularly to a primary frequency modulation method of a generator set. A primary frequency modulation method of a single-shaft combined cycle unit of single-burning low heat value blast furnace gas comprises the steps of firstly collecting the frequency difference of power grids in real time and converting the frequency difference into a load response required value, judging and obtaining the actual load value according to the limiting conditions; then overlaying the actual load response value and the actual load data, and converting the overlaid result into the adjusted value of a full static blade angle after correction, thereby adjusting the fuel flow so as to change the load of the unit; in case one of the following two conditions is met, the operation of primary frequency modulation is finished; 1) the exhaust temperature of a gas turbine reaches the upper limit value of the exhaust temperature of the gas turbine, and at same time the inlet guide vane angle of an air compressor reaches the maximum opening degree; 2) the adjustment of the full static blade angle is finished according to the adjusted value. In the invention, the full static blade angle is adjusted by using the corrected load difference according to the characteristics of the blast furnace gas, and the load response requirement of the primary frequency modulation of the unit is met.

Description

technical field [0001] The invention relates to the field of power plant automation control, in particular to a method for primary frequency regulation of a generating set. Background technique [0002] One of the important tasks in the operation of the power system is to monitor and control the grid frequency. The grid frequency is an important indicator for evaluating power quality. If the frequency exceeds the allowable range, it will affect the safety and economic benefits of the power system, generator sets and users. More serious fluctuations It will cause serious impact on the power grid and even cause the power grid to collapse. The primary frequency regulation function of the generator set is very important to maintain the stability of the power grid frequency. [0003] The primary frequency regulation of the power grid is to automatically control the frequency change of the power grid through the speed control system of the generator set itself, and adapt to the fl...

Claims

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Application Information

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IPC IPC(8): F02C9/28F01K23/10
CPCY02E20/16
Inventor 聂慧明姚峻吴建昌毕宇辉黄永良
Owner BAOSHAN IRON & STEEL CO LTD
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