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Matching method of supercritical secondary reheating unit reheater and thermal system

An ultra-supercritical, double reheating technology, applied in the direction of machines/engines, mechanical equipment, steam engine devices, etc., can solve the problems of increasing the initial investment of power plants and reducing the economic efficiency of power plants, so as to improve thermal economy and reduce plant consumption Electricity, increase the effect of steam extraction

Active Publication Date: 2015-05-13
GUODIAN SCI & TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the size of the boiler will increase the initial investment of the power plant, thereby reducing the economical efficiency of the power plant

Method used

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  • Matching method of supercritical secondary reheating unit reheater and thermal system

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Ultra-supercritical secondary unit reheating system

[0019] Such as figure 1 As shown, the ultra-supercritical secondary unit reheat system of the present invention mainly includes a steam turbine, a boiler (1), a generator, a feedwater pump turbine (5), a high-pressure regenerative heater (8), and a deaerator ( 7), a hybrid heater (6), a low-pressure heater (9), the boiler (1) is an ultra-supercritical DC double reheat boiler, and the steam turbine is a single-shaft steam turbine, including an ultra-high pressure cylinder (2) , high-pressure cylinder (3) and medium-pressure cylinder and low-pressure cylinder (4);

[0020] Among them, the exhaust port of the ultra-high pressure cylinder (2) is connected to the boiler (1) one way, and the other is connected to the feedwater pump turbine (5); the steam extraction port of the feedwater pump turbine (5) is connected to the high pressure regenerative heater (8 ), the other is connected to the deaerator (7), th...

Embodiment 2

[0024] Example 2: Matching method between reheater and thermal system of ultra-supercritical secondary unit

[0025] In the method of matching the reheater and thermal system of the ultra-supercritical secondary unit, the boiler (1) is an ultra-supercritical once-through secondary reheat boiler, the steam turbine is equipped with an ultra-high pressure cylinder (2), and the exhaust of the ultra-high pressure cylinder (2) There are two steam paths, one path goes to the boiler (1) for reheating once, and the other path supplies steam for the water pump turbine (5); the steam that has been reheated once enters the high-pressure cylinder (3) to do work, and all the exhaust steam from the high-pressure cylinder goes to the boiler ( 1) Secondary reheating, the steam reheated by the boiler (1) goes to the medium-pressure cylinder and low-pressure cylinder in turn to do work; the extraction steam of the feedwater pump turbine (5) is taken from the exhaust steam of the ultra-high pressu...

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Abstract

The invention belongs to the field of large supercritical secondary reheating thermal power generating units, and relates to a method capable making a heat exchange area needed by secondary reheating and a thermal system matched, in particular to a matching method of a supercritical secondary reheating unit reheater and the thermal system. According to the scheme, the heated face needed by the reheater is reduced, reasonable match between the reheater and the thermal system is achieved, exhausted steam of a water pump turbine is absorbed through a hybrid heater, the heat exchange area is reduced, and initial investment of a power plant is reduced. Heat for pumping steam of the water pump turbine can be finally recycled to the thermal system, and economical performance of the power plant is improved. Therefore, according to the scheme, the method is favorable for reducing the initial investment of the power plant and improving operating benefits of the power plant.

Description

technical field [0001] The invention belongs to the field of ultra-supercritical secondary reheating large-scale thermal power units, and relates to a method capable of matching the heat exchange area required for secondary reheating with a thermal system, and a corresponding ultra-supercritical secondary reheating system of the ultra-supercritical unit. Background technique [0002] Due to the large power of the ultra-supercritical double reheating unit, the steam flow rate is large, and secondary reheating is required, so the area required for the reheater in the boiler is also large. If no measures are taken, it is difficult to make the reheater Match with thermal system. The existing method to solve this problem is to increase the size of the boiler, thereby increasing the layout space of the reheater, increasing the effective heat exchange area of ​​the reheater, and achieving the purpose of matching the reheater and the thermal system. However, increasing the size of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K7/22F01K11/02
Inventor 阎维平刘建民李永生朱哮水常金旺路长
Owner GUODIAN SCI & TECH RES INST
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