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Overheat early warning method for supercritical boiler heating surface pipe wall using discretization conversion

A technology for supercritical boilers and heating surface tubes, which is applied in the direction of steam boilers, steam boiler accessories, steam boiler components, etc., and can solve the problems of simple prediction of temperature, high production process requirements, and inability to prevent overheating, etc. Problems, achieve the effect of reducing the number of overheating, reducing costs and improving stability

Active Publication Date: 2017-03-22
CHANGCHUN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high production process requirements, inability to prevent overheating, frequent replacement or upgrading of pipelines, which will bring huge economic burden to the user unit, and difficult to popularize in practical application by simply predicting the temperature. A discretized conversion early warning method for supercritical boiler heating surface tube wall overtemperature

Method used

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  • Overheat early warning method for supercritical boiler heating surface pipe wall using discretization conversion
  • Overheat early warning method for supercritical boiler heating surface pipe wall using discretization conversion
  • Overheat early warning method for supercritical boiler heating surface pipe wall using discretization conversion

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specific Embodiment approach 1

[0036] Specific implementation mode one: combine figure 1 A discretized conversion supercritical boiler heating surface tube wall overtemperature early warning method in this embodiment is specifically prepared according to the following steps:

[0037] Step 1. Install sensors on the boiler, collect M rows of boiler operating status data and M rows of boiler heating surface tube wall status data at intervals of Gape seconds and store them in the historical data table HistoryTable; the process of collecting and storing data is as follows figure 2 shown;

[0038] Among them, Gape is the number of seconds between data collection intervals, and the default is 10 seconds; the boiler operating status includes 17 kinds of status information:

[0039] Generator power c1, high pressure feed water pressure c2, high pressure feed water temperature c3, desuperheater inlet steam temperature c4, desuperheater outlet steam temperature c5, furnace side main steam pressure c6, furnace main st...

specific Embodiment approach 2

[0061] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, a sensor is installed on the boiler, and the boiler operation status data and boiler heating surface tube wall status data of the boiler are collected at intervals of Gape seconds and stored in the history The specific process in the data table HistoryTable is:

[0062] Step 11. Install sensors on the boiler to collect boiler operating status data from the boiler and boiler heating surface tube wall status data; install sensors on the boiler to collect data information from the boiler, which are divided into two categories:

[0063] Step 12. Establish a historical data table HistoryTable; the HistoryTable contains the following fields: the storage time Time of the data entry, the information fc1 to fc17 of c1 to c17 storing the operating state of the boiler, and the d1 to d5 of storing the tube wall of the heating surface of the boiler The information fd1 to fd5 an...

specific Embodiment approach 3

[0079] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in the step 2, utilize the discretization conversion method FeahterDic to output dc1 to dc17 total 17 variables of the m row. The specific process is:

[0080] Step 21, establish the discrete conversion method FeahterDic, and input the data entry position Pos1 of HistoryTable;

[0081] Step 22, establishing discretized state variables dc1 to dc17, a total of 17 state variables;

[0082] Step two and three, determine the logical expression according to the 17 state variables c1 to c17, if the logical expression is true then store the result as 1, if the logical expression is false then store the result 0;

[0083] The logical expression "greater than" compares the fc1 to fc17 fields of the Pos1 record and the Pos1-1 record of the HistoryTable field by field, and stores the result in dc1 to dc17; if the logical expression is true, store the result 1, logical If the ex...

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Abstract

The invention relates to an overheat early warning method for a supercritical boiler heating surface pipe wall, in particular to an overheat early warning method for the supercritical boiler heating surface pipe wall using discretization conversion. In order to solve the problems that the generation technological requirements are high, overheat cannot be eliminated completely, over-frequent replacement or upgrade of pipelines can bring huge economical burdens to use units and pure temperature prediction cannot be popularized in practical application easily, the overheat early warning method for the supercritical boiler heating surface pipe wall using discretization conversion is provided. The method is implemented through the following steps that first, a HistoryTable is established; second, the variables from dc1 to dc17 are output; third, the variables from gc1 to gc17 are output; fourth, the dmark variable is output; fifth, a disaggregated Model is acquired; and sixth, whether the supercritical boiler heating surface pipe wall is to be overheated or not is subjected to early warning. The overheat early warning method is applied to the overheat early warning field of the supercritical boiler heating surface pipe wall.

Description

technical field [0001] The invention relates to a supercritical boiler heating surface tube wall overtemperature early warning method, in particular to a supercritical boiler heating surface tube wall overtemperature early warning method with discrete conversion. Background technique [0002] In recent years, with the rapid development of my country's power generation industry, thermal power plants use supercritical boilers to generate electricity. The stable and safe operation of supercritical boilers is very important for the safe production of thermal power plants. Due to the influence of design, management, use of coal and metal materials, etc., the temperature of the tube wall on the heating surface of a supercritical boiler may exceed the rated safe operating temperature during operation. The service life will be greatly shortened. At the same time, once the supercritical boiler is in an overheated state for a long time, it will easily cause the scale on the tube wall ...

Claims

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Application Information

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IPC IPC(8): F22B37/47
CPCF22B37/47
Inventor 孙宏彬潘欣
Owner CHANGCHUN INST OF TECH
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