Energy saving system for adopting absorption heat pump to deeply recover smoke waste heat for central heating

An absorption heat pump and flue gas waste heat technology, applied in hot water central heating systems, heating systems, household heating, etc., can solve problems such as temperature drop, underutilization, and flue gas loss, and achieve enhanced heat transfer capacity, considerable economic and environmental benefits, and the effect of reducing energy consumption

Pending Publication Date: 2019-06-28
DALIAN UNIV OF TECH
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Problems solved by technology

On the other hand, after the high-temperature flue gas passes through the spray system of the desulfurization tower, the temperature has been greatly r

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  • Energy saving system for adopting absorption heat pump to deeply recover smoke waste heat for central heating

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[0021] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0022] During the heating period, the return water temperature of the heating network is T h , The outlet water temperature of flue gas waste heat recovery tower 8 is T tc , use the anti-corrosion high-efficiency water-water plate heat exchanger 11 and the absorption heat pump 12 in series to recover the waste heat of the flue gas: the return water from the heat network enters the absorption heat pump 12, and recovers the waste heat of the flue gas through the anti-corrosion high-efficiency water-water plate heat exchanger 11 The circulating water from tower 8 undergoes indirect heat exchange, and the temperature rises by ΔT 1 , corresponding to the opening of the valve 37, the absorption heat pump 12 uses the air drawn by the steam turbine as the driving heat source; if at this time (T h +ΔT 1 )≥T g , ...

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Abstract

The invention provides an energy saving system for adopting an absorption heat pump to deeply recover smoke waste heat for central heating and belongs to the technical field of recovery and utilization of smoke waste heat of boilers of thermal power plants. The recovered smoke waste heat is used for heating return water of a heat supply network in a central heating system. Firstly, countercurrentheat exchange is conducted between low-temperature high-humidity smoke coming out from a desulfurizing tower and spraying circulation water in a smoke waste heat recovery tower in the smoke waste heatrecovery system, and recovered smoke waste heat is stored in high-temperature circulation water. Smoke and water direct contact type heat exchange technology is adopted for the smoke waste heat recovery tower in the energy saving system, heat and mass transfer effects are improved, heat exchange capability is enhanced, meanwhile desulfurizing capability is achieved, the desulfurizing effect of athermal power plant can be met, a smoke waste heat recovery and desulfurizing integrated function is achieved, and pollutant emission can be further lowered. According to the energy saving system, heating capacity of the thermal power plant is enhanced, energy utilization efficiency is improved, the environmental influence of the thermal power plant is lowered, and economic benefits and environmental benefits are both achieved.

Description

technical field [0001] The invention belongs to the technical field of boiler flue gas purification and flue gas waste heat recovery and utilization in coal-fired thermal power plants, and particularly relates to a high-efficiency flue gas waste heat that utilizes absorption heat pump technology to use flue gas waste heat for centralized heating and simultaneously has desulfurization functions recycling system. Background technique [0002] The design exhaust temperature of coal-fired thermal power plants can reach about 130°C to 150°C, and the potential for waste heat recovery is huge. At present, the main technical difficulty of flue gas waste heat recovery technology is how to reduce the exhaust gas temperature below the flue gas dew point temperature so as to fully recover a large amount of condensation waste heat contained in the flue gas, and at the same time avoid the sulfuric acid vapor in the flue gas from condensing and causing damage to the equipment itself. Seve...

Claims

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Application Information

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IPC IPC(8): F24D3/18F24D19/10F23J15/02F28C1/02F28C1/16F28F25/02F22D11/06B01D53/50B01D53/78
CPCY02B30/12
Inventor 王海超张若瑜端木琳李祥立
Owner DALIAN UNIV OF TECH
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