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System for greatly increasing low-load feed water temperature of power station boiler

A technology of feed water temperature and power station boiler, applied in the system field, can solve the problems of limited layout space, complex system and high investment, and achieve the effect of simple technology and rich technical means

Pending Publication Date: 2021-11-09
江苏慧峰仁和环保科技有限公司 +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many low-load denitrification technologies at present, there are generally many problems such as limited layout space, limited questioning effect, high investment, and complex systems.

Method used

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  • System for greatly increasing low-load feed water temperature of power station boiler
  • System for greatly increasing low-load feed water temperature of power station boiler

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Experimental program
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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] First, if figure 1 As shown, it is a conventional thermal flow chart, and the specific thermal process of the unit is as follows:

[0016] S1. The condensed water at the outlet of the deaerator 11 is pressurized by the feedwater pump 12 and then enters the No. 3 high-pressure heater 10 of the unit's recovery system for heating. The extraction steam of the No. 3 high-pressure heater 10 is supplied to The input comes from the medium pressure cylinder 3 of the steam turbine; a three-stage steam extraction check valve 20 and a three-stage steam extraction shut-off valve 21 are installed on the three-stage steam extraction pipeline g, which play the roles of preventing backflow and controlling the pipeline path respectively;

[0017] S2. The feed water from the outlet of the No. 3 high-pressure heater 10 of the unit recovery system...

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Abstract

The invention discloses a system for greatly increasing the low-load feed water temperature of a power station boiler. A heating steam source is additionally arranged on a section of steam extraction pipeline of a first high-pressure heater of a unit regenerative system, and the steam source is taken from a superheated steam system or a main steam pipeline; a second-section external steam source pipeline is additionally arranged between a first-section steam extraction pipeline and a second-section steam extraction pipeline, and a third-section external steam source pipeline is additionally arranged between a second-section steam extraction pipeline and a third-section steam extraction pipeline. The temperature of feed water entering a boiler economizer is adjusted by adjusting the pressure of steam entering a first high-pressure heater, a second high-pressure heater and a third high-pressure heater, and finally the purpose of adjusting the temperature of flue gas at the inlet of an SCR reactor is achieved. According to the scheme, the technology is simple, a large amount of space is not occupied, moreover, only part of pipelines and valves need to be additionally arranged on an original system, and the problems that other low-load denitration technologies are limited in arrangement space, limited in temperature raising effect, high in investment, complex in system and the like are solved.

Description

technical field [0001] The invention relates to a system, in particular to a system for greatly increasing the low-load feed water temperature of a utility boiler. Background technique [0002] Coal-based energy structure and utilization through direct combustion are one of the main causes of air pollution. In order to ensure air quality, coal-fired electric boilers must adopt advanced pollutant control technology to control the total amount of pollutants discharged by coal-fired units, and implement stricter emission standards. Nowadays, the development of a large number of new energy sources is the trend, and the role of coal-fired units has gradually changed from power generation to power grid peak regulation. Changes in the role of coal-fired units lead to changes in the operating parameters of the units, and coal-fired units will be in half-load or low-load conditions most of the time. [0003] At present, all large-scale coal-fired units have been upgraded with denit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/00F22D1/18F22D1/20F22D1/34F22D1/50
CPCF22D1/003F22D1/18F22D1/20F22D1/34F22D1/50
Inventor 褚晓亮于帅郝丽娜董雅翠
Owner 江苏慧峰仁和环保科技有限公司
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