Thermal power unit pure-condensing working condition sliding pressure curve determination method with valve throttling loss being taken into consideration

A technology of sliding pressure curve and throttling loss, which is applied in the determination of sliding pressure curve and the determination of sliding pressure curve under pure condensing condition of thermal power units, which can solve the problems of high unit heat loss, cumbersome data process, and inaccurate sliding pressure curve, etc. Achieve the effect of reducing the reduction of economic benefits, simple calculation, and strong timeliness

Inactive Publication Date: 2017-07-07
HARBIN INST OF TECH +2
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  • Abstract
  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the data obtained from the sliding pressure experiment in the existing sliding pressure curve determination method is cumbersome, and the sliding pressure curve obtained through the sliding pressure experiment is not accurate, resulting in high heat loss of the unit, and then provide a consideration Method for Determination of Sliding Pressure Curve of Thermal Power Units in Pure Condensation Condition Based on Throttle Loss of Valves

Method used

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  • Thermal power unit pure-condensing working condition sliding pressure curve determination method with valve throttling loss being taken into consideration
  • Thermal power unit pure-condensing working condition sliding pressure curve determination method with valve throttling loss being taken into consideration
  • Thermal power unit pure-condensing working condition sliding pressure curve determination method with valve throttling loss being taken into consideration

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specific Embodiment approach 1

[0024] Specific implementation mode one: combine figure 2 Describe this implementation mode, this implementation mode comprises the following steps:

[0025] Step 1: Collect the historical data of all working conditions in the DCS system of the unit;

[0026] Collect the opening of each valve group, comprehensive valve position command, unit main steam pressure, unit main steam temperature, first extraction point pressure, first extraction point temperature, main steam flow and unit load;

[0027] Step 2: Screen the data in step 1, and group and count the data in the load interval to be collected;

[0028] Select 50% unit rated load ± 1MW, 60% unit rated load ± 1MW, 70% unit rated load ± 1MW and 80% unit rated load ± 1MW and the main steam temperature is the rated main steam temperature ± 1 ℃ interval data for classification ;

[0029] Step 3: Use the data analysis of each load interval to obtain the optimal main steam pressure corresponding to the corresponding load point...

specific Embodiment approach 2

[0032] Specific implementation mode two: combination figure 2 To illustrate this embodiment, the historical data collected in step 1 of this embodiment needs to be the operating status data of the sequence valve of the unit, and the data includes all loads between the minimum output value and the rated value of the unit load. The reason for this setting is that the sliding pressure curve is designed for the operating condition of the sequence valve of the unit, and the purpose of collecting full working condition data is to obtain a more accurate optimal pressure point in the least square method fitting in step 3 The purpose of collecting the opening degree of each valve group and the comprehensive valve position command is to verify whether the unit is in the operating state of the sequence valve and to obtain the law of the sequence valve, to collect the main steam pressure of the unit, the temperature of the main steam of the unit, the pressure of the first extraction The ...

specific Embodiment approach 3

[0033] Specific implementation mode three: combination figure 2 Describe this embodiment, the step of drawing the sliding pressure curve in step 4 of this embodiment: calculate the sliding pressure curve of the sliding pressure section according to the optimal main steam pressure at each load point obtained in step 3, and the calculation method is based on the minimum The polynomial function linear fitting of the square method is combined with the minimum main steam pressure of the boiler steady combustion and the rated main steam pressure of the unit to obtain the final sliding pressure curve. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

[0034] Since the main steam pressure of the middle and low pressure constant pressure section of the constant-sliding-constant sliding pressure method is the lowest pressure of the boiler for stable combustion, and the high pressure constant pressure section is the rated main steam pressure of t...

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Abstract

The invention provides a thermal power unit pure-condensing working condition sliding pressure curve determination method with valve throttling loss being taken into consideration and relates to a thermal power unit pure-condensing working condition sliding pressure curve determination method, and is to solve the problems of complex sliding pressure experiment data obtaining process, inaccuracy of a sliding pressure curve obtained through a sliding pressure experiment and high thermal loss of a thermal power unit in an existing sliding pressure curve determination method. The method comprises the following steps: 1) collecting overall working condition historical data in a unit DCS system; 2) screening the data in the step 1), and carrying out grouping statistics on the data in a load interval to be collected; 3) carrying out data analysis on the data in each load interval to obtain optimal main steam pressure corresponding to corresponding load points; and 4) obtaining a sliding pressure curve by utilizing the optimal main steam pressure of each load point obtained in the step 3). The method is used in steam turbine operation.

Description

technical field [0001] The invention relates to a method for determining a sliding pressure curve, in particular to a method for determining a sliding pressure curve in a pure condensing working condition of a thermal power unit considering valve throttling loss, and belongs to the field of steam turbine operation control. Background technique [0002] With the increase of the peak-to-valley load difference in the power grid, many large-capacity generating units in China are currently participating in the peak-shaving work of the power grid. When the steam turbine operates under variable working conditions, its operating economy and safety will be reduced. Different operation modes have different impacts on unit economy and safety. At present, when 300MW and above units participate in power grid peak regulation, they all adopt compound sliding pressure operation mode. The composite sliding pressure operation mode is fixed-sliding-constant operation mode, which is an operati...

Claims

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Application Information

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IPC IPC(8): G01M15/02
CPCG01M15/02
Inventor 王凤良李兴朔万杰方国春张腾宇刘刚张楠高岩松李玉贵李建华宋乃秋任学良张磊刘金福颜培刚于达仁
Owner HARBIN INST OF TECH
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