Unlock instant, AI-driven research and patent intelligence for your innovation.

Integral structure design method of high parameter air cooling turbine

A technology of overall structure and design method, applied to mechanical equipment, steam engine devices, engine components, etc., can solve problems such as long shafting length, temper embrittlement, affecting unit safety, etc., and achieve high thermal efficiency

Inactive Publication Date: 2009-02-18
SHANGHAI POWER EQUIP RES INST +1
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For domestically produced subcritical air-cooled 300MW-600MW steam turbines, the inlet steam parameters are subcritical parameters of 16.7MPa / 538°C / 538°C, the design back pressure is 8kPa~18kPa, and the flow part of the high-pressure cylinder and the medium-pressure cylinder or the combined cylinder of high-middle pressure The number of blade stages is designed to be 12 to 32, and the height of the final stage moving blade is 540mm-680mm. For a subcritical air-cooled 600MW steam turbine, the overall form of the high-medium pressure combined cylinder structure is a single-shaft three-cylinder four-exhaust steam, and high-medium pressure separate cylinders The overall form of the structure is a single-shaft four-cylinder four-exhaust steam. The disadvantages of these two overall structures are that there are only a large number of low-pressure cylinders, the length of the shaft system is relatively long, and the cost is high.
The air-cooled steam turbine whose inlet steam parameters are increased to the supercritical parameters of 24.2MPa-28MPa / 538°C-620°C / 566°C-650°C is called a high-parameter air-cooled steam turbine, using the traditional design method of the overall structure of the supercritical wet-cooled steam turbine, so The inlet steam pressure of the designed high-parameter air-cooled steam turbine low-pressure cylinder is 0.8MPa-1.2MPa, and the inlet steam temperature is 350°C-400°C. However, the current NiCrMoV steel low-pressure rotor will be tempered and brittle if it is operated above 350°C for a long time. phenomenon, affecting the safety of the unit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Integral structure design method of high parameter air cooling turbine
  • Integral structure design method of high parameter air cooling turbine
  • Integral structure design method of high parameter air cooling turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A certain type of high-parameter air-cooled 1200MW steam turbine. The overall structure of the steam turbine is shown in Figure 1. The overall structure of the single-shaft four-cylinder four-exhaust steam is adopted; the steam inlet steam pressure of the high-pressure cylinder 1 of the steam turbine is designed to be 28MPa, and the steam inlet steam temperature is designed to be 600°C , the inlet steam temperature of medium-pressure cylinder 2 is designed to be 610°C, and the power generation thermal efficiency of the unit is increased by 5 percentage points compared with the subcritical air-cooled unit of the same power; the design back pressure of low-pressure cylinder 6 of the steam turbine is 15kPa, and the exhaust steam of the low-pressure cylinder adopts direct air cooling System cooling, the annual water consumption of the unit is 4.75 million tons, which is one-fourth of the wet cooling unit with the same power; Compared with the three low-pressure cylinders of ...

Embodiment 2

[0021] A certain type of high-parameter air-cooled 800MW steam turbine. The overall structure of the steam turbine is shown in Figure 2. The overall structure of the single-shaft three-cylinder two-exhaust steam is adopted; the steam inlet steam pressure of the high-pressure cylinder 1 of the steam turbine is designed to be 25MPa, and the steam inlet steam temperature is designed to be 593°C , the inlet steam temperature of the medium pressure cylinder 2 is designed to be 593°C, and the power generation thermal efficiency of the unit is increased by 4 percentage points compared with the subcritical air-cooled unit of the same power; the design back pressure of the low pressure cylinder 6 of the steam turbine is 15kPa, and the exhaust steam of the low pressure cylinder adopts direct air cooling System cooling, the annual water consumption of the unit is 3.17 million tons, which is one-fourth of the wet-cooled unit with the same power; Compared with the two low-pressure cylinders...

Embodiment 3

[0023] A certain type of high-parameter air-cooled 700MW steam turbine. The overall structure of the steam turbine is shown in Figure 3. The overall structure of the single-shaft, two-cylinder, and two-exhaust steam is adopted; The design is 600°C, the inlet steam reheating steam temperature of high and medium pressure combined cylinder 3 is designed to be 620°C, the power generation thermal efficiency of the unit is 5 percentage points higher than that of the subcritical air-cooled unit with the same power; the design back pressure of the low pressure cylinder 6 of the steam turbine is 15kPa, the low pressure cylinder The exhaust steam is cooled by a direct air cooling system, and the annual water consumption of the unit is 2.77 million tons, which is a quarter of that of a wet-cooled unit with the same power; cylinder, compared with the two low-pressure cylinders of the same power air-cooled steam turbine with a blade height of 640mm dedicated final stage moving blades, one l...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to high-parameter air-cooled steam turbine general structure design technology. The steam intake high parameter of a high pressure cylinder and an intermediate pressure cylinder or an integrated HP and IP cylinder of the steam turbine is 24.2MPa-28MPa / 538DEG C-620DEG C / 566DEG C-650DEG C. The power generation thermal efficiency of the unit is improved by 2-6 percentage points as compared with a subcritical air-cooled unit of the same power. A low pressure cylinder of the steam turbine adopts a direct air-cooling system or an intermediate air-cooling system during steam exhaust. Water consumption amount of the unit is one fourth of the water consumption amount of a wet cooling unit of the same power. The height of a special last rotor blade is arranged to be 1.18-1.85 times the height of a subcritical air-cooled steam turbine. A high-parameter air-cooled steam turbine at power of 600MW-1200MW is dispensed with a low pressure cylinder as compared with a subcritical air-cooled steam turbine of the same power, thus reducing fabrication cost. The steam intake pressure and temperature of the low pressure cylinder of the steam turbine are respectively arranged to be0.5-0.7MPa and 290-340 DEG C. Made of NiCrMoV steel, a low pressure rotor will not have temper brittleness phenomena, thus improving the safety of the low pressure rotor.

Description

technical field [0001] The invention relates to a method for designing the overall structure of a high-parameter air-cooled steam turbine, belonging to the technical field of power station steam turbines. Background technique [0002] For domestically produced subcritical air-cooled 300MW-600MW steam turbines, the inlet steam parameters are subcritical parameters of 16.7MPa / 538°C / 538°C, the design back pressure is 8kPa~18kPa, and the flow part of the high-pressure cylinder and the medium-pressure cylinder or the combined cylinder of high-middle pressure The number of blade stages is designed to be 12 to 32, and the height of the final stage moving blade is 540mm-680mm. For a subcritical air-cooled 600MW steam turbine, the overall form of the high-medium pressure combined cylinder structure is a single-shaft three-cylinder four-exhaust steam, and high-medium pressure separate cylinders The overall form of the structure is single-shaft four-cylinder four-exhaust steam. The dis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F01K7/32F01D25/14F01D5/28F01D25/24F01D5/02
Inventor 史进渊危奇杨宇邓志成孙庆
Owner SHANGHAI POWER EQUIP RES INST