Energy-saving heat supply system with function of reducing temperature of heat supply return water

Abstract

The invention discloses an energy-saving heat supply system with a function of reducing the temperature of heat supply return water, and belongs to the field of improvement of energy utilization efficiency. Heat exchange can be repeatedly carried out on heat sources by multistage heat exchangers, multistage absorption heat exchange units, multistage compression heat pumps and an ice making type refrigerator, accordingly, the heat supply areas can be enlarged, and the energy utilization efficiency can be improved. The energy-saving heat supply system has the advantages that the temperature of the return water of heat supply primary pipe networks can be reduced and reach 0 DEG C, the return water contains 10% of ice particles, accordingly, route heat loss of the return water of the heat supply primary pipe networks can be reduced, the temperature difference of the return water of the heat supply primary pipe networks can be increased and reaches 118 DEG C from the original 60 DEG C, the flow rate of circulating water of the heat supply primary pipe networks can be lowered, energy consumption of circulating pumps can be reduced, heat supply flow rates of a user side can be greatly increased, the delivery efficiency of the pipe networks can be improved, the heat supply scale can be expanded, waste heat of a cooling tower can be recycled, and the like.

Description

technical field [0001] The invention belongs to the field of improving energy utilization efficiency, and relates to an energy-saving heating system that reduces the return water temperature of a heating pipe network for cogeneration heating and greatly expands the heating scale. Background technique [0002] At present, although combined heat and power generation has realized the step-by-step utilization of energy, it still belongs to the traditional heating method, with low heating efficiency and large energy waste. The main problems of traditional heating methods are as follows: [0003] 1. The waste heat emitted by cooling towers of thermal power plants is the largest and most concentrated waste heat resource in a city. It is called "urban waste heat energy island". The heat cannot be transported out, and the waste heat of cooling towers is of low grade and cannot be used. [0004] 2. The heat lost by cooling towers in thermal power plants accounts for 20%-30% of the to...

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Problems solved by technology

[0015] For power plant cooling tower waste heat that cannot be fully utilized due to low grade, direct combustion of fuel (coal, oil, natural gas, etc.) for heat supply wastes heat quality (exergy), small temperature difference between supply and return water in the heating primary pipe network, and energy consumption of circulating pumps large, low transmission efficiency, heat loss in the return water pipeline, and limited transportation capacity of the existing heating pipe network. Energy-saving heating system that greatly expands the heating scale

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