Centralized heat supply system and method

Abstract

The invention discloses a centralized heat supply system and method. The centralized heat supply system comprises one or more heat source heat-exchange systems, one or more absorption heat-exchange systems and one or more compression heat-exchange systems. The centralized heat supply method comprises the steps of heat exchange between a heat source heat-supply medium and primary network water, circulation of the primary network water, heat exchange between the primary network water and secondary network water, circulation of the secondary network water, heat exchange between the secondary network water and tertiary network water, water supply and return of a tertiary network and the like. According to the centralized heat supply system and method, compared with an existing large-temperature-difference centralized heat supply mode, the heat supply capacity of a secondary network water supply pipelines is kept under the precise of not increasing the supplied water temperature and pressure of an old heat supply pipe network in an urban district and not affecting the heat delivery capacity of the heat supply network in the urban district, and thus the transformation cost of the existing pipeline network is saved.

Description

technical field [0001] The invention relates to heating engineering technology in the field of energy, in particular to a central heating system and a central heating method thereof. Background technique [0002] Due to the rapid development of urbanization, the continuous expansion of urban scale, and the continuous improvement of urban environmental protection awareness, the heating mode of regional boiler rooms or small thermal power plants can no longer meet the needs of the growing urban centralized heating area. Urban heating The model is gradually developing towards the method of using large-scale thermal power plants as the heat source for central heating. However, due to the limited steam extraction and heat supply capacity of thermal power plants, even under the condition of steam extraction and heat supply, there is still a large amount of exhaust steam discharged at the end of the steam turbine, and a large amount of exhaust steam condensation waste heat is disch...

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Problems solved by technology

[0004] However, since the heating pipe network in the urban area of ​​most northern cities in China is formed on the basis of years of continuous construction, it is subject to many constraints such as the construction environment, cost, and city appearance, and the old heating pipe network in the urban area has been renovated. There is a lot of resistance, and in many cases it is even impossible

During the popularization and application of this central heating technology with large temperature difference in heating cities in the north, the problem of poor matching between the existing heating pipe network in the heating load center and the high-temperature hot water delivered by the thermal power plant was encountered. Due to the difference in design standards and the influence of aging after years of operation, these heating pipe networks mostly have pressure and temperature resistance restrictions on the water supply and return water pressure and water temperature in the heating pipe network.

Especially in old urban areas, the existing urban heating pipe network can hardly withstand the temperature and pressure of high-temperature hot water transported by thermal power plants through long-distance pipelines

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