Energy saving amount determination method for recycling waste heat of circulating cooling water by means of heat pump

A technology for circulating cooling water and determining methods, applied in heat recovery systems, energy-saving heating/cooling, heat pumps, etc., can solve problems such as no complete set of calculation methods, reduce coal consumption, increase external heat supply, and rigorous thinking Effect

Active Publication Date: 2014-10-08
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, there is no complete set of calculation methods for the specific value of the energy saving of the recovery of the waste heat of the circulating cooling water of the condenser by the absorption heat pump.

Method used

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  • Energy saving amount determination method for recycling waste heat of circulating cooling water by means of heat pump

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example

[0058] For a specific condenser circulating cooling water supply flow rate Q in =7800t / h; condenser circulating cooling water return pressure P out =0.12MPa, return water temperature T out =42.8℃, condenser circulating cooling water return water H out =179.3kJ / kg; Condenser circulating cooling water supply pressure P out =0.28MPa, supply water temperature T out =16.7℃, condenser circulating cooling water supply water H out =70.3kJ / kg, the system utilizes the formula calculation of step (1),

[0059] (1) Determination of the residual heat absorbed by the heat pump from the circulating cooling water of the condenser;

[0060] m y =Q in ·(H out -H in )=Q in ·[f(P out ,T out )-f(P in ,T in )]

[0061] After calculation, the waste heat absorbed by the heat pump from the circulating cooling water of the condenser is 236166kW;

[0062] (2) Determination of the reduction in generating power of the unit after the pressure of the condenser is increased; it is calculated ...

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Abstract

The invention relates to an energy saving amount determination method for recycling waste heat of circulating cooling water by means of a heat pump. The method includes the step (1) of determining the amount of waste heat absorbed by the heat pump from circulating cooling water of a condenser, the step (2) of determining the decreased amount of unit electricity generation power after pressure of the condenser is improved, and the step (3) of determining the energy saving amount of waste heat generated when the heat pump is utilized to recycle circulating cooling water of the condenser. The heat pump is used for recycling waste heat of circulating cooling water of the condenser to heat circulating water of a heating network, losses of a cold source of a steam turbine are reduced, external heating loads are increased, consumption of fire coal is reduced, and the purpose of energy saving is achieved. The energy saving amount of waste heat, recycled by the heat pump, of circulating cooling water of the condenser is calculated successfully by means of system analysis, the through is rigorous, calculation is scientific, and the method has great significance in improvement on recovery efficiency of waste heat and the waste heat recovery process.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation and energy saving, in particular to a method for determining energy saving by using a heat pump to recover waste heat of circulating cooling water. Background technique [0002] The loss of the cold source of the steam turbine is one of the most important losses in the thermal power system of the current thermal power plant, accounting for about 40% of the total heat absorbed by the unit, and a large part of the energy is lost in vain because it cannot be fully utilized. With the intensification of competition among enterprises and the increasingly stringent requirements for energy saving, emission reduction and environmental protection, the loss of steam turbine cooling source is further reduced, fuel consumption is saved, and pollution emissions are reduced. Absorption heat pumps are used to recover waste heat from the circulating cooling water of steam turbine condensers. Incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B30/06
CPCY02B30/52Y02P80/15
Inventor 张利周连升张宇甘智勇王建屈斌王梓越
Owner STATE GRID CORP OF CHINA
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