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Reheat steam temperature control system and method and thermal power generating unit device

A technology for reheating steam temperature and control system, which is applied in general control system, superheat temperature control, control/regulation system, etc., can solve problems such as adjustment and method to ensure the stability of reheated steam temperature and reduce economic benefits of thermal power units.

Inactive Publication Date: 2015-11-04
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that to keep the reheated steam temperature stable, it must be adjusted. However, the outlet steam temperature of the reheater of the existing thermal power unit has a large deviation. If the reheated steam temperature is adjusted, the adjustment process will cost the unit The labor intensity of the staff is very high, and it is impossible to adjust it through simple methods. More methods are used to ensure the stability of the reheating steam temperature, thereby reducing the economic benefits of thermal power units

Method used

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  • Reheat steam temperature control system and method and thermal power generating unit device
  • Reheat steam temperature control system and method and thermal power generating unit device

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Embodiment 1

[0029] The present invention provides a reheat steam temperature control system, the schematic diagram of its circuit structure is as follows figure 1 As shown, it includes the first function module f1(x), the first addition module Σ1, the addition and subtraction module J, the first adjustment module PI, the third addition module Σ3, the small selection module V and the first operation module connected in sequence Z / S1, the input terminal of the first adding module Σ1 is also connected with the output terminal of the first constant value module G1, and the input terminal of the third adding module Σ3 is also connected with the output terminal of the second function module f2(x).

[0030] The output terminal of the addition and subtraction module J is also connected in turn to the second addition module Σ2, the second adjustment module PID, the fourth addition module Σ4 and the second operation module Z / S2, and the input terminal of the second addition module Σ2 is also connect...

Embodiment 2

[0045] In order to solve the above technical problems, the present invention also provides a thermal power unit equipment, including a boiler and a reheat steam temperature control system for controlling the temperature of the boiler, wherein the reheat steam temperature control system is the one described in the first embodiment above Reheat steam temperature control system.

Embodiment 3

[0047] In order to solve the above-mentioned technical problems, the present invention also provides a reheat steam temperature control method for boiler temperature based on the reheat steam temperature control system described in the first embodiment above, including:

[0048] S1. Correct the main steam flow rate according to the preset reheat steam temperature setting value;

[0049] S2. Comparing the corrected main steam flow with the outlet steam temperature of the reheater to obtain the deviation value;

[0050] S3. The first adjustment is performed according to the deviation value, and after the adjustment, the swing angle of the burner is controlled through the adjustment result through the feed-forward compensation loop.

[0051] Further, after step S2 and before step S3, it also includes:

[0052] S4. Perform a second adjustment according to the deviation value, and control the opening and closing of the desuperheating water controller through the adjusted result. ...

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Abstract

The invention discloses a reheat steam temperature control system and method and a thermal power generating unit device. The reheat steam temperature control system comprises a first function module, a first addition module, an addition and subtraction module, a first adjusting module, a third addition module, a minus selection module and a first operation module. The input end of the first addition module is connected with the output end of a first fixed value module. The input end of the third addition module is connected with the output end of a second function module. The output end of the addition and subtraction module is sequentially connected with a second addition module, a second adjusting module, a fourth addition module and a second operation module. The input end of the second addition module is connected with the output end of a second fixed value module. The input end of the fourth addition module is connected with the output end of a fourth function module. A single-loop PI adjustment mode is adopted, the burner port pendulum angle adjustment serves as the main part, the attemperation water spraying serves as the auxiliary part, and accordingly the reheat steam temperature can be adjusted by changing the inclination angle of a burner port; and safety running of a unit is guaranteed, and the heat economy of the unit is improved.

Description

technical field [0001] The invention relates to the field of automatic control of power stations, in particular to a reheat steam temperature control system, method and thermal power unit equipment. Background technique [0002] In the automatic control of modern thermal power plants, reheat steam temperature affects the safety, stability and economic benefits of thermal power units, so the control of intermediate reheat units and reheat steam temperature is a very important control link. The general methods to adjust the reheat steam temperature are: adjust the reheater or superheater baffle, change the reheat steam temperature by changing the flue gas flow rate of the reheater; Adjust the temperature down. [0003] At present, in order to improve the thermal efficiency of the generator set, the boiler-turbine unit above the high pressure adopts an intermediate reheating system, that is, a reheating heating surface is correspondingly added in the boiler, so that the steam ...

Claims

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Application Information

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IPC IPC(8): F22G5/00G05B23/00
Inventor 倪子俊丁满堂赵成林祁晓玲
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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