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Double-reheat supercharged steam turbine thermal system

A secondary reheating and thermal system technology, applied in steam engine installations, steam applications, mechanical equipment, etc., can solve the problems of high investment in overall renovation projects, lack of application and promotion, and low return on investment

Active Publication Date: 2014-05-21
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, due to the transformation of subcritical low-parameter units into ultra-supercritical high-parameter units, it is necessary to replace new boilers, increase front cylinders, replace heaters, feed water pumps and other main and auxiliary equipment, and the overall transformation project investment is very high, each 300MW The unit investment is about 600 million yuan, and each 600MW unit needs about 1.2 billion investment, resulting in a low return on investment, only about 5% to 6% (that is, the payback period is 15 to 17 years), and it is not economically feasible.
Therefore, the existing technology has not been applied and promoted.

Method used

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Embodiment 1

[0041] image 3 It is a structural diagram showing the thermal system of the double-reheat supercharged steam turbine in Embodiment 1 of the present invention. and figure 1 In comparison, it can be seen that in figure 1 In the thermal system of the double-reheat supercharged steam turbine shown, the back pressure extraction cylinder BEST and the second high pressure heater H3 that are not in the prior art are added. As shown in the figure, the thermal system of the double-reheat turbocharged steam turbine has reheaters A0 and A1, condenser A2, condensate pump A3, deaerator A4, feed water pump group A5, economizer A6, superheater A7, back pressure extraction cylinder BEST, low pressure cylinder C1, medium pressure cylinder C2, high pressure cylinder C3, super high pressure cylinder C4 first generator G1, second generator G2, low pressure heater H1, first high pressure heater H2, and the second high pressure heater H3. Among them, the ultra-high pressure cylinder C4 and the ...

Embodiment 2

[0048] Figure 4 It is a structural diagram showing the thermal system of the double-reheat supercharged steam turbine in Embodiment 2 of the present invention.

[0049] Embodiment 2 of the present invention is similar to Embodiment 1, the difference is that the steam extraction of the newly added second high-pressure heater H3 is changed from the exhaust steam of the back pressure extraction cylinder BEST, and the ultra-high pressure cylinder C4 and the back pressure extraction steam The flow capacity of the cylinder BEST increases, and correspondingly, the output of the first generator G1 increases.

Embodiment 3

[0051] Figure 5 It is a structural diagram showing the thermal system of the double-reheat supercharged steam turbine in Embodiment 3 of the present invention.

[0052] Embodiment 3 of the present invention is similar to Embodiment 2, except that a feed water booster pump A8 is added at the entrance of the newly added second high-pressure heater H3. Therefore, when transforming the old low-parameter unit, it is not necessary to replace the feed water pump unit and its drive unit or motor, nor to replace the original multi-stage high-pressure heater, which can significantly reduce the project cost.

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Abstract

The invention discloses a double-reheat supercharged steam turbine thermal system which is characterized in that a high parameter steam turbine generating set is provided with a back pressure steam extraction cylinder; the back pressure steam extraction cylinder and an ultrahigh pressure cylinder are set into a split or combined structure; a regeneration and double-reheat thermal cycle system is provided with a second high pressure heater for regeneration; steam extraction of the second high pressure heater is led from steam exhaust of the back pressure steam extraction cylinder. The double-reheat supercharged steam turbine thermal system disclosed by the invention further improves thermal efficiency of electricity generation, reduces power supply coal consumption, and obviously increases the unit output.

Description

technical field [0001] The invention relates to a thermal system of a double reheating supercharged steam turbine, in particular to a thermal system of a double reheating supercharged steam turbine with a back pressure extraction cylinder. Background technique [0002] According to the steam inlet parameters from low to high, thermal power generating units can be divided into subcritical, supercritical and ultra supercritical. The higher the inlet steam parameter, the higher the thermal efficiency of power generation. [0003] For the thermal power generation units built in the 1980s and 1990s and which have been in operation for a long time, due to the technical limitations of their construction years, subcritical (typical parameters 16.7MPa, 538°C) low-parameter turbogenerators are mostly used, and the coal consumption for power supply is about 320g / kW.h. The new thermal power generation units built in recent years mostly adopt supercritical (typical parameters 24.2MPa, ...

Claims

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Application Information

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IPC IPC(8): F01K23/02F01K17/00
Inventor 申松林刘鹤忠陈仁杰叶勇健施刚夜朱佳琪兰花姚君
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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