Heat regeneration system for improving deep peak regulation capacity of coal-fired unit

By mixing high-temperature and high-pressure steam with reduced temperature in the reheating system of the coal-fired unit to heat up the water supply temperature, the problem of difficult to reduce the minimum technical output under deep peak-shaving conditions of the coal-fired unit is solved, and a higher peak-shaving amplitude and denitrification adaptability are achieved.

CN119826159APending Publication Date: 2025-04-15XIAN THERMAL POWER RES INST CO LTD
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Patent Information

Application Number
CN202510029936.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-08
Publication Date
2025-04-15

AI Technical Summary

Technical Problem

It is difficult for existing coal-fired units to effectively reduce the minimum technical output under deep peak-shaving conditions, resulting in high pressure on new energy consumption and reduced boiler load, resulting in insufficient equipment adaptability.

Method used

A heat recovery system is designed to extract high-temperature and high-pressure steam from the main steam pipe of the boiler outlet or other heated surface outlet pipes to the temperature reduction pressure reducer, mix with the heat reduction water from the outlet of the feed water pump and enter the heat recovery system heater, thereby increasing the water supply temperature, thereby reducing the amount of steam entering the high-pressure cylinder, medium-pressure cylinder, etc. without the boiler load remains unchanged.

Benefits of technology

Without reducing the boiler load, the steam inlet volume and power generation load of the turbine are reduced, the minimum technical output of the unit is reduced, the peak adjustment amplitude of the thermal power unit is increased, the inlet smoke temperature of the SCR denitrification system is enhanced, and the wide load denitrification adaptability and hydrodynamic characteristics of the unit are improved.

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Abstract

The invention discloses a regenerative system for improving deep peak regulation capacity of a coal-fired unit. The regenerative system is characterized in that high-temperature and high-pressure steam generated by a boiler is heated by a superheater and then enters a high-pressure cylinder; high-temperature and high-pressure steam discharged by the high-pressure cylinder is heated by the reheater and then enters the medium-pressure cylinder and the low-pressure cylinder; exhaust steam of a low-pressure cylinder enters a condenser, is pressurized by a condensate pump and then enters a low-pressure heater and a deaerator to be heated by the steam, and heated feed water enters a high-pressure heater through a feed water pump to be heated. High-temperature and high-pressure steam is pumped to the temperature and pressure reducer, mixed with temperature-reducing water and then enters the heat regeneration system heater to increase the feed water temperature, and when the boiler load is not changed, the work doing steam amount is reduced to achieve load reduction; the water supply temperature is increased, so that the inlet smoke temperature of the SCR denitration system is increased, and the wide-load denitration capability is enhanced; the water temperature of an inlet of the coal economizer is correspondingly increased, the under-enthalpy is reduced, the hydrodynamic characteristic is remarkably improved, and the operation safety of the water cooling wall is improved.
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Citation Information

Patent Citations

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