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Online monitoring system and method of exhaust steam enthalpy value of low pressure cylinder of steam turbine

A monitoring system and low-pressure cylinder technology, applied in the direction of measuring devices, measuring heat, instruments, etc., can solve the problems that it is difficult to meet online monitoring, many parameters are required, and the measurement technology is not mature enough.

Pending Publication Date: 2019-01-15
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the exhaust steam of the low-pressure cylinder of the steam turbine is in the wet steam area, and its enthalpy cannot be directly calculated according to the pressure and temperature.
However, the measurement technology of the online dryness measurement device is not yet mature and reliable, and the online calculation speed of the conventional loop iterative calculation method is difficult to meet the needs of online monitoring, and there are too many parameters required

Method used

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  • Online monitoring system and method of exhaust steam enthalpy value of low pressure cylinder of steam turbine
  • Online monitoring system and method of exhaust steam enthalpy value of low pressure cylinder of steam turbine
  • Online monitoring system and method of exhaust steam enthalpy value of low pressure cylinder of steam turbine

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Experimental program
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Effect test

Embodiment 1

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0060] like figure 1As shown, the steam turbine low-pressure cylinder exhaust enthalpy online monitoring system of this embodiment includes a low-pressure cylinder 2, a condenser 11, a condensate pump 12, a shaft plus 16, and four sets of low-pressure heaters. The four sets of low-pressure heaters are respectively LP 1 (18), LP 2 (19), LP 3 (20), LP 4 (21); low-pressure cylinder 2 outlet and condenser 11 steam inlet are connected through low-pressure cylinder exhaust pipe 7, condensate pump 12. Shaft plus 16, low plus 1 (18), low plus 2 (19), low plus 3 (20) and low plus 4 (21) are sequentially arranged at the condensate outlet and condensate outlet of condenser 11 along the water flow direction Between pipelines 22; low plus 1 (18), low plus 2 (19) and low plus 3 (20) pass through corresponding steam pipes respectively, namely low plus 1 st...

Embodiment 2

[0067] On the basis of the first embodiment, the online monitoring system for the exhaust steam enthalpy of the low-pressure cylinder of the steam turbine in this embodiment adds a terminal display module; the terminal display module is connected with the data processing module to receive and display the data processed by the data processing module .

Embodiment 3

[0069] In this embodiment, for the on-line monitoring system for the exhaust enthalpy value of the steam turbine low-pressure cylinder of the second embodiment, its monitoring method is as follows: figure 2 shown, including the following steps:

[0070] 1) Real-time data collection;

[0071] 1.1) Raw data collection:

[0072] The sensors of the online monitoring system for exhaust enthalpy of low-pressure cylinders of steam turbines collect various data and transmit them to the data processing module. The data to be collected are as follows:

[0073] Table 1 Raw data collection table

[0074] name

unit

the symbol

name

unit

the symbol

Low plus 4 inlet steam pressure

MPa

P 4,q

Shaft plus inlet steam temperature

℃

t zq

Low plus 4 inlet steam temperature

℃

t 4,q

Condensate flow

t / h

D c

Low plus 3 extraction pressure

MPa

P c 3,q

Low Plus 4 Hydrophobic Temperature

℃

t 4,...

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Abstract

The invention provides an online monitoring system and method of an exhaust steam enthalpy value of a low pressure cylinder of a steam turbine. The system is provided with sensors at the positions corresponding to a steam pipeline of a condenser, an axis heater, and four groups of low pressure heaters where steam is exhausted by the low pressure cylinder. As monitoring for flow of circulating water and temperature of inlet water and outlet water is added, the heat of the exhaust steam of the low pressure cylinder can be calculated indirectly through a cold end system; when a heat balance equation is built for a condenser of a steam turbine thermodynamic system to calculate the exhaust steam heat of the low pressure cylinder, the heat which is taken away by the circulating water system andcan be measured directly is introduced to the balance equation, building of the heat balance equation is greatly simplified and accumulated error caused by a traditional calculation method is avoided.The monitoring system only monitors parameters of a low pressure heater system and parameters of a cold end system, calculation parameters are reduced to the maximum extent, and the calculation precision of the exhaust steam enthalpy value of the low pressure cylinder can be improved efficiently.

Description

technical field [0001] The invention relates to an on-line monitoring system and method for exhaust steam enthalpy of a low-pressure cylinder of a steam turbine, and belongs to the technical field of energy-saving of thermal power plants. Background technique [0002] The on-line monitoring of the enthalpy value of exhaust steam in the low-pressure cylinder of the steam turbine plays an important role in the on-line economic analysis of the thermal power unit. However, the exhaust steam of the low-pressure cylinder of the steam turbine is in the wet steam region, and its enthalpy cannot be directly calculated according to the pressure and temperature. However, the measurement technology of the online dryness measurement device is not yet mature and reliable, and the online calculation speed of the conventional cyclic iterative calculation method is difficult to meet the needs of online monitoring, and there are too many parameters required. In the invention patent (applicat...

Claims

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Application Information

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IPC IPC(8): G01K17/10
CPCG01K17/10
Inventor 杨文正马晓峰谭锐于强李呈桐马靖磊郭嘉黄新长
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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