A temperature control system and control method for steam turbine exhaust cylinder

A temperature control system and exhaust cylinder technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems of affecting the unit, aggravating the last stage blades, poor controllability, etc., achieving high returns and reducing temperature , Improve the effect of deep peak shaving capability and operational safety and reliability

Inactive Publication Date: 2020-09-15
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the poor controllability of the traditional low-pressure exhaust cylinder water spray cooling system, it is easy to cause the backflow of cooling spray water and aggravate the water erosion of the final blade, which affects the safety of the unit operation. A better exhaust cylinder cooling method and system is designed. For The stable operation of the unit under ultra-low load and start-stop conditions is of great significance

Method used

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  • A temperature control system and control method for steam turbine exhaust cylinder
  • A temperature control system and control method for steam turbine exhaust cylinder
  • A temperature control system and control method for steam turbine exhaust cylinder

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A temperature control system for the exhaust cylinder of a steam turbine, which includes a medium pressure cylinder 000, a low pressure cylinder 100, a low pressure exhaust cylinder 110, a condenser, a condenser heat trap 220, a condensate pump group, a heater group, and a temperature-reducing water injection regulating valve Group, exhaust steam temperature detection device 600, main controller 800 for water spray temperature reduction, temperature reduction water spray device and low pressure cylinder inlet flow passage 120; the low pressure cylinder 100, low pressure exhaust cylinder 110, condenser and condenser heat The traps 220 are arranged from top to bottom. The exhaust steam temperature detection device 600 is located on the cylinder wall of the low-pressure exhaust cylinder 110. The condenser is connected to a condensate pump group through a pipe. The condensate pump group includes a condensate pump A301, Condensate pump B302 and condensate pump C303 are connect...

Embodiment 2

[0026] A control method for the temperature control system of the exhaust cylinder of a steam turbine, such as figure 2 The pattern shown is carried out. When the low-pressure cylinder is running at ultra-low load, the steam enters the main condensation zone of the condenser through the low-pressure exhaust cylinder. The circulating cooling water enters the water chamber, and the circulating cooling water exits the water chamber. The steam becomes condensed after condensation. The water is boosted by the condensate pump group as the spray water source for the temperature-reducing water spray device to achieve cooling of the low-pressure exhaust cylinder. The exhaust steam temperature detection device detects the temperature of the low-pressure cylinder in real time, and the temperature-reducing spray is controlled by the main controller of spray water temperature reduction. The opening degree of the water main regulating valve realizes the size of the water volume of the temper...

Embodiment 3

[0028] A working principle diagram of a temperature control system for the exhaust cylinder of a steam turbine, such as image 3 Shown, including inlet isobars of low pressure cylinder under rated conditions p 0 , Ultra-low load low pressure cylinder inlet isobar p 0 ' , Low pressure cylinder exhaust steam isobar p 2 , The inlet isotherm of the low pressure cylinder before spraying water temperature reduction t 0 , Low-pressure cylinder exhaust steam isotherm before water spray desuperheating under rated conditions t 1 , The inlet isotherm of the low pressure cylinder after spraying the temperature t 0 ' , Exhaust steam isotherm of low-pressure cylinder before ultra-low-load water injection to reduce temperature t 1 ' , The ideal expansion line A of the low pressure cylinder before the water spray at the rated working condition 1 B 1 , The actual expansion line A of the low-pressure cylinder before the water spray at the rated working condition 1 C 1 , The ideal expansion line A ...

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Abstract

The invention discloses a temperature control system and method for a steam turbine exhaust hood. The temperature control system is characterized in that when a steam turbine is in ultralow-load operation, condensate is used as the desuperheating spraying water source, and a spraying desuperheating master controller regulates the open degree of a desuperheating spraying main regulating valve according to temperature measured by a steam exhaust temperature detecting device to spray cooling water into a low-pressure-exhaust-hood inlet channel from a desuperheating spraying device so as to lowersteam exhaust temperature. Compared with a traditional low-pressure-exhaust-hood spraying desuperheating system, the temperature control system has the advantages that closed-loop control of desuperheating spraying quantity, last state blade root water erosion, caused by desuperheating water flowing back to the last stage of a low-pressure exhaust hood, of a traditional spraying desuperheating device is avoided, and the temperature of the low-pressure exhaust hood is lowered while the reliability and safety of the steam turbine in ultralow-load operation are increased.

Description

Technical field [0001] The invention relates to ultra-low load operation of a steam turbine, in particular to a temperature control system and a control method for the exhaust cylinder of the steam turbine. Background technique [0002] A steam turbine is a rotating machine that uses steam as a working medium to convert steam thermal energy into mechanical work. Most of the exhaust steam of condensing steam turbine enters the wet steam zone. The water droplets produced by the spontaneous condensation of steam in the low-pressure cylinder can absorb the blast friction heat generated by the high-speed rotation of the rotor and the static and dynamic friction in the cylinder. At the same time, for large-scale reheating units, with different power requirements and parameter requirements, the steam turbine works in different states. When the steam turbine deviates far from the design conditions, that is, when the steam turbine is running at a low load or no load at rated speed, the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D25/00F01D25/12F01D21/00
CPCF01D21/003F01D25/00F01D25/12
Inventor 杨建明廖先伟周前徐珂解兵张宁宇
Owner SOUTHEAST UNIV
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