A regenerative system capable of improving the peak shaving capacity of the unit and a dynamic calculation method for the steam temperature of the heat storage tank of the regenerative system

A heat recovery system and heat storage tank technology, which is applied in the field of dynamic calculation of the steam temperature of the heat recovery system and heat storage tank of the heat recovery system, can solve the problems of poor peak-shaving ability and flexibility of thermal power units

Inactive Publication Date: 2021-04-06
NORTHEAST DIANLI UNIVERSITY +2
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Problems solved by technology

[0007] Aiming at the current problem of poor peak-shaving ability and flexibility of thermal power units, the purpose of the present invention is to provide a heat recovery system that can improve the peak-shaving ability of the unit; Dynamic Calculation Method of Steam Temperature Variation in Heat Storage Tank

Method used

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  • A regenerative system capable of improving the peak shaving capacity of the unit and a dynamic calculation method for the steam temperature of the heat storage tank of the regenerative system
  • A regenerative system capable of improving the peak shaving capacity of the unit and a dynamic calculation method for the steam temperature of the heat storage tank of the regenerative system
  • A regenerative system capable of improving the peak shaving capacity of the unit and a dynamic calculation method for the steam temperature of the heat storage tank of the regenerative system

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example

[0241] Transform the formula (29) to get the following formula

[0242]

[0243] In the formula: dT is the change of steam temperature in the heat storage tank, ℃; dτ is the micro-increment of time, s; Δτ is the time interval, s; T 0 is the initial temperature of the heat storage tank, °C; T 1 is the temperature after the Δτ time interval, °C. q m,in is the mass flow rate of steam flowing into the heat storage tank, kg / s; m 1 for T 1 Steam mass of heat storage tank at any time, kg; h 0 is the steam enthalpy flowing into the heat storage tank, kJ / kg; h 2 is the exhaust enthalpy of small steam turbine, kJ / kg; c v Specific heat capacity for constant volume of steam in heat storage tank, kJ / (kg °C); c P is the specific heat capacity of steam at constant pressure in the heat storage tank, kJ / (kg °C), and γ is c P with c v Ratio.

[0244] Further derivation can be obtained:

[0245]

[0246] In the formula: T 0 is the initial temperature of the heat storage tank, ℃...

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Abstract

The invention is a heat recovery system capable of improving the peak-shaving capability of the unit, including a power station boiler, a steam turbine, a generator, a condenser, a condensate pump, a low-pressure heater, a deaerator, a feed water pump, a high-pressure heater, a small steam turbine and The temperature and pressure reducer is characterized in that it also includes a heat storage tank. The heat storage tank is used to supply steam to the heat recovery system and the small steam turbine. Stored directly in the heat storage tank in the form of steam. When the load of the unit is high, the boiler feed water increases, and the steam consumption of the heat recovery system and the small turbine increases. At this time, the steam stored in the heat storage tank can be released for use in the heat recovery system and the small turbine, which can reduce the consumption from the unit. Extract steam to increase the output of the unit and play the role of eliminating peaks and flat valleys. It also provides a dynamic calculation method for the temperature change of the heat storage tank.

Description

technical field [0001] The invention relates to the field of thermal equipment performance state monitoring and diagnosis during the peak regulation process of a coal-fired power unit, and is a dynamic calculation method for a heat recovery system and a heat storage tank steam temperature of the heat recovery system that can improve the peak regulation capability of the unit. Background technique [0002] In recent years, with the deepening of national energy conservation and emission reduction policies, clean energy has developed rapidly. However, with the rapid development of wind power, it is also facing serious problems of wind curtailment. Due to the regional characteristics of wind power, 80% of my country's wind energy resources are concentrated in the "three north" regions, namely the northeast, north and northwest regions; the energy supply and energy demand in the "three north" regions are reversely distributed. The problem of curtailment of wind power is becoming...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K3/14F01K11/02F01D15/10F22D1/50G06F30/20G06F119/08
CPCF01D15/10F01K3/14F01K11/02F22D1/50G06F30/20G06F2119/08
Inventor 曹丽华司和勇董恩伏胡鹏飞马汀山葛维春李树阳杨荣祖王艳红姜铁骝罗桓桓周桂平戴黎
Owner NORTHEAST DIANLI UNIVERSITY
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