Determination method of saving energy by using heat pump to recover waste heat of circulating cooling water

A technology for circulating cooling water and determining methods, applied in heat recovery systems, energy-saving heating/cooling, heat pumps, etc., can solve the problem of no complete set of calculation methods, and achieve the goals of reducing coal consumption, scientific calculation, and reducing the loss of cold sources Effect

Active Publication Date: 2016-06-08
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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  • Determination method of saving energy by using heat pump to recover waste heat of circulating cooling water

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example

[0058] For a specific condenser circulating cooling water supply flow 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, water supply temperature T out =16.7℃, condenser circulating cooling water supply H out =70.3kJ / kg, the system is calculated using the formula in step (1),

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

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

[0061] After calculation, the heat pump absorbs the residual heat from the condenser circulating cooling water to be 236166kW;

[0062] (2) The determination of the reduction of the generating power of the unit after the condenser pressure is increased; it is calculated by the following formula:

[0063] ΔN...

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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 energy-saving thermal power generation, in particular to a method for determining the energy-saving amount by using a heat pump to recover the waste heat of circulating cooling water. Background technique [0002] Steam turbine cold source loss is one of the most important losses in the current thermal power system of thermal power plants, accounting for about 40% of the total heat absorption of the unit, and a large part of the energy is lost due to insufficient utilization. With the intensification of competition among enterprises and increasingly stringent requirements for energy saving, emission reduction and environmental protection, the loss of steam turbine cooling sources will be further reduced, fuel consumption will be saved, and pollution emissions will be reduced. The use of absorption heat pumps to recover waste heat from the circulating cooling water of the steam turbine condenser can be Increasi...

Claims

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Application Information

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Patent Type & Authority Patents(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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