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Oxidation air system control method based on data model and mechanism operation

A data model and control method technology, which is applied in chemical instruments and methods, program control, separation methods, etc., can solve the problems of large maintenance, high investment cost, and increased investment cost, so as to avoid cumulative errors, low investment cost, The effect of guaranteeing reasonableness

Active Publication Date: 2021-03-16
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. With absorption tower slurry CaSO 3 Oxidation fan with real-time on-line measurement of concentration starts and stops on demand: Individual power plants install a real-time sulfite online monitoring system in the desulfurization system, and use the real-time test concentration of sulfite as the basis for judging the start and stop of the fan in the oxidizing air system, but the sulfite The online real-time monitoring system is expensive and requires a lot of maintenance. Compared with the benefits brought by the start and stop of the oxidation fan, the cost performance is low, and it is generally not accepted by the power plant personnel;
[0006] 3. Oxidation fan frequency conversion control method based on fixed excess air coefficient: some power plants use oxidation fan driven by 6kV motor with frequency conversion, and control frequency conversion according to fixed excess air coefficient to reduce power consumption of oxidation wind system , this method also has the problem of high initial investment cost, and for most power plants, the fan of the oxidation air system is a Roots fan, if the equipment is modified, the investment cost will be further increased. In order to ensure that the oxidation air can meet the requirements of all working conditions, it is necessary to select a large excess air coefficient, which will also cause a large waste of energy

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  • Oxidation air system control method based on data model and mechanism operation
  • Oxidation air system control method based on data model and mechanism operation

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Embodiment 1

[0048] An embodiment of an oxidation wind system control method based on data models and mechanism calculations. The main principle of this method is: through the historical operation and test data of the unit, establish the absorption tower slurry CaSO 3 Concentration model by which to predict absorber CaSO 3 Concentration, the deviation between the concentration and the maximum allowable concentration is used as the basis for judging whether the oxidation fan is out of operation. When the difference between the maximum allowable concentration and the predicted concentration is greater than the outage threshold, the oxidation fan is stopped. After the oxidation fan is out of operation, it is added synchronously Mechanism calculation method to estimate CaSO per unit time 3 Generated amount, and calculate the absorption tower slurry CaSO by rolling according to this value 3 Concentration, when calculating the resulting collection slurry CaSO 3 When the concentration rises to ...

Embodiment 2

[0086] The oxidative wind system control method based on the data model and mechanism calculation of the above-mentioned embodiments of the present invention can also be improved as follows. When the modeling data is further screened for steady-state working conditions, the stable operating time of the load working conditions before and after the sampling time may not be The steady-state judgment basis can also use flue gas flow, FGD inlet sulfur content or flue gas flow multiplied by FGD inlet sulfur content and other variables before and after the sampling time for stable operation time as the steady-state judgment basis; the input variable data in the steady-state data with CaSO 3 Pearson correlation analysis was performed on the concentration test data, and variables with a correlation coefficient greater than 0.2 were selected as input variables, and the CaSO 3 The assay concentrations together constitute the final modeling data, and other correlation analysis methods and...

Embodiment 3

[0088] Net calcium sulfite content NG(k) in the absorption tower at the present moment: use the net calcium sulfite mass SQ(k) in the absorption tower at the present moment and the net by-product mass BQ(k) in the absorption tower to calculate the net calcium sulfite content in the absorption tower at the present moment, It should be noted that CaSO 3 The concentration is not a negative value, and when the test value AS(k) is input, the test value is assigned to NG(k) to participate in the next cycle. When there is no test value input, the calculation method can be expressed as:

[0089] NG(k)=(SQ(k)+abs(SQ(k))) / 2 / BQ(k);

[0090] When the test value AS(k) is input, its calculation method is:

[0091] NG(k)=AS(k);

[0092] Among them, the data can also be corrected through the online learning link design, specifically,

[0093] By predicting CaSO 3 Concentration and Assay CaSO 3 The concentration deviation corrects variables such as the system's forced oxidation rate and n...

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Abstract

The invention discloses an oxidation air system control method based on a data model and mechanism operation, and the method comprises the steps: S1, performing modeling data screening: employing historical operation data and test data of a unit as original modeling data; S2, establishing an absorption tower CaSO3 concentration prediction model; and S3, controlling starting and stopping of an oxidation fan. The real-time prediction of the CaSO3 concentration of the absorption tower is realized by adopting a mode of combining modeling and mechanism calculation, the real-time prediction of the calcium sulfite concentration can be realized without adding new measurement equipment, and the investment cost is low; according to the method, long-time-span historical and test data are used as modeling raw materials, the modeling result can represent wider operating conditions of the unit, the CaSO3 concentration output by the model is used as a judgment basis for shutdown of the oxidation fan,and accumulated errors generated in the process of obtaining the CaSO3 concentration in a mechanism calculation mode are avoided. And the reasonability of shutdown judgment of the oxidation fan is ensured.

Description

technical field [0001] The invention belongs to the technical field of oxidation fan control in thermal power plants, and in particular relates to a method for controlling an oxidation fan system based on data models and mechanism calculations. Background technique [0002] In order to ensure the slurry quality of the wet desulfurization system, most thermal power plants adopt the operation mode of continuous operation of the fans of the oxidation air system. A large waste of electric energy, so the intermittent start and stop of the oxidation wind system is of great significance to the energy saving and consumption reduction of the desulfurization system of the thermal power unit; [0003] At present, there are mainly three operating modes of the oxidation fan, namely: 1. Continuous operation mode of the oxidation fan; 2. CaSO with absorption tower slurry 3 The on-demand start-stop method of the oxidation fan based on real-time online measurement of the concentration; 3. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418B01D53/34B01D53/50B01D53/80B01D53/96
CPCG05B19/41875B01D53/346B01D53/96B01D53/502B01D53/80B01D2251/404G05B2219/32368Y02P90/02
Inventor 杨艳春
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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