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Control method of combined heat and power generation unit for cooperative steam extraction of cold section and hot section of reheater

A technology of a cogeneration unit and a control method, which is applied in the field of electric power and can solve the problems of excessive axial thrust of a steam turbine, abnormal vibration of the steam turbine, and damage to the reheating wall temperature of a boiler over temperature.

Active Publication Date: 2021-03-16
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the steam extraction volume of the exhaust steam pipe of the high-pressure cylinder and the steam intake pipe of the medium-pressure cylinder are not controlled properly in these transformation methods, problems such as overtemperature damage of the boiler reheating wall temperature, excessive axial thrust of the steam turbine, and abnormal vibration of the steam turbine will occur.

Method used

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  • Control method of combined heat and power generation unit for cooperative steam extraction of cold section and hot section of reheater
  • Control method of combined heat and power generation unit for cooperative steam extraction of cold section and hot section of reheater
  • Control method of combined heat and power generation unit for cooperative steam extraction of cold section and hot section of reheater

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Effect test

Embodiment 1

[0045] When the extraction steam flow rate from the cold section of the boiler reheater is basically similar to the extraction steam flow rate from the hot section of the boiler reheater (both are about 50t / h), as shown in working condition 1 in Table 2, the monitored parameters are all at Within the range of normal operating parameters, the unit can operate safely.

Embodiment 2

[0047] When the 100t / h heating steam flow is only extracted from the hot section of the boiler reheater, as shown in working condition 2 in Table 2, the axial displacement of the monitored parameters changes from -0.16mm to -0.56mm, which is close to Alarm value -0.63mm, there is a hidden danger in the safe operation of the unit;

Embodiment 3

[0049] When the heating steam flow rate of 100t / h is only extracted from the cold section of the reheater of the boiler, as shown in working condition 3 in Table 2, the metal temperature of the reheater tube wall in the monitored parameters changes from 535°C to 561°C , not far from the alarm value of 575°C, there is a hidden danger of overtemperature damage to the reheater tube wall;

[0050] The detailed unit operating condition monitoring data are shown in Table 2. The relevant protection values ​​of the present invention are shown in Table 3, and alarm and shutdown protection related operations are performed according to the protection values ​​in Table 3.

[0051] Table 2 Monitoring data table

[0052]

[0053] Table 3 Protection setting table

[0054] name unit normal value alarm value Stop value axial displacement -0.63～+1.05 -0.63 or +1.05 -0.83 or +1.25 Shaft vibration μm ≤76μm ≥125μm 200μm Bearing cover vibration ...

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Abstract

An embodiment of the invention discloses a control method of a combined heat and power generation unit for cooperative steam extraction of a cold section and a hot section of a reheater. The combinedheat and power generation unit comprises a first heat supply steam header, a second heat supply steam header, the boiler reheater, a high-pressure cylinder, an intermediate-pressure cylinder, a data acquisition and control device, a thrust pad lubricating oil system, a pipeline, a measuring device and a valve. The data acquisition and control device (57) is observed to enable the steam extractionflow of the cold section of the boiler reheater to be basically close to the steam extraction flow of the hot section of the boiler reheater, and meanwhile whether parameters such as axial displacement, first shaft vibration, second shaft vibration, first bearing bush cover vibration, second bearing bush cover vibration, thrust pad temperature and reheater pipe wall metal temperature are within asafety range value or not is observed. According to the control method, online monitoring and adjusting of unit operation parameters are achieved, the effects of temperature control and vibration reduction are achieved, the service life of equipment is prolonged, the steam extraction and heat supply flexibility of the unit is improved, and full utilization of energy is achieved.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a control method for a heat and power cogeneration unit based on cooperative extraction of steam from cold and hot sections of a reheater. Background technique [0002] At present, the work plan on energy conservation and emission reduction has been released, which proposes to optimize the industrial and energy structure, reduce the consumption of scattered coal and fuel oil; strengthen the reduction of major pollutants, accelerate the development of combined heat and power and centralized heating, and use the existing resources around cities and industrial parks There are a series of requirements for cogeneration units, pure condensing generating units and low-grade waste heat to implement heating transformation, and to eliminate coal-fired boilers within the scope of heating and gas supply. [0003] At present, the small industrial boilers on the market are gradually be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D15/10F01D21/00F01D25/12F01K11/02F01K13/00F01K13/02F01K17/02F22G1/00F24D1/06F24D1/08F24D19/10
CPCF01D15/10F01D21/003F01D25/12F01K11/02F01K13/003F01K13/02F01K17/025F24D1/06F24D1/08F24D19/1003F22G1/00Y02E20/14
Inventor 文立斌
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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