Overheat steam temperature multi-target control method of ultra-supercritical unit

A technology of ultra-supercritical unit and control method, which is applied in the direction of self-adaptive control, general control system, control/regulation system, etc. It can solve the problems of superheater metal tube wall overtemperature, coupling oscillation, and affecting equipment safety, etc., to achieve broaden The effect of the range of applications and the difficulty of simplifying the design

Inactive Publication Date: 2018-05-01
深圳市深汕特别合作区华润电力有限公司
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Problems solved by technology

[0004] 1) The operating intensity of the operators has increased significantly;
[0005] 2) The metal tube wall of the superheater is often overheated for a long time due to untimely manual operation, which affects the safety of the equipment;
[0006] 3) Due to the great difference between the wa

Method used

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  • Overheat steam temperature multi-target control method of ultra-supercritical unit
  • Overheat steam temperature multi-target control method of ultra-supercritical unit
  • Overheat steam temperature multi-target control method of ultra-supercritical unit

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and examples. The following examples are used to describe the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

[0023] like figure 1 A multi-objective control method for the superheated steam temperature of an ultra-supercritical unit is shown, including the multi-objective control method of the outlet temperature control method and the tube wall metal temperature control method; using the model prediction control method, the steam temperature inert zone prediction model is established respectively and the wall temperature prediction model, and use the large value of the deviation between the two prediction models and the actual measured parameters as one of the feedback adjustment components; according to the feedback adjustment component in the control method predicted b...

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Abstract

The invention relates to an overheat steam temperature multi-target control method of an ultra-supercritical unit, which is a multi-target control method consisting of an outlet temperature control method and a pipe wall metal temperature control method; by adopting a model forecasting control method, a steam temperature inert segment forecasting model and a wall temperature forecasting model areset up respectively; a bigger value of the bias values between two forecasting models and the actual measurement parameter is used as the one of feedback adjusting components; according to the feedback adjusting component in the model forecasting control method, two control targets of adjusting overheat steam temperature and finishing superheater metal wall temperature in the control feedback loopare reconciled to be the target of adjusting the post temperature of an object cooler of a front spraying guiding zone; the controller is designed specific to the object characteristics of the frontspraying guiding zone.

Description

technical field [0001] The invention belongs to the field of thermal power engineering control, in particular to a multi-objective control method for superheated steam temperature of an ultra-supercritical unit. Background technique [0002] Due to variable coal quality and complex boiler combustion conditions, domestic ultra-supercritical units often experience uneven local heat load distribution during operation. This phenomenon is particularly significant when the unit changes load at a relatively high rate. The consequence of uneven distribution of local heat load is that the metal temperature of some superheater tube walls is too high. When the outlet steam temperature of the superheater has not reached the rated temperature, the temperature of some metal tube walls will reach the alarm value. At this time, in order to ensure the safe operation of the boiler, the temperature of the metal tube wall of the superheater must be controlled. [0003] The superheated steam te...

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 张清健张海安陈咏康刘英伦黄正来董灿彬刘军华
Owner 深圳市深汕特别合作区华润电力有限公司
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