High-efficiency and energy-saving heating method and heating system

Abstract

The invention provides a high-efficiency and energy-saving heating method and a heating system using the same. The heating system comprises a steam extraction and condensation type steam turbine, a condenser, a power plant circulating water cooling system, a heat supply network circulating pump, a heat supply network circulating heater and a low-temperature heat supply network. Return water of the low-temperature heat supply network is used as refrigerant of the cooling water system of the condenser when the heating system is used for heating in winter, and is primarily heated in the condenser, in the heating system using the heating method, the power plant circulating water cooling system and the low-temperature heat supply network are respectively connected into the condenser and the heat supply network heater by pipelines, a switch valve unit is further arranged between the power plant circulating water cooling system and the low-temperature heat supply network by a pipeline, and the condenser can selectively use return water of the power plant circulating cooling system or the return water of the low-temperature heat supply network as cooling water via the valve unit in a switching manner. The high-efficiency and energy-saving heating method and the heating system thereof have the advantages of high heat efficiency and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of heating, in particular to a high-efficiency energy-saving heating method and a heating system. Background technique [0002] Most of the heat sources for heating in my country come from thermal power plants. Combined heat and power generation is an important technical measure to improve the steam power cycle and improve the fuel utilization rate of thermal power plants. Because the combined heat and power generation realizes the cascade utilization of energy, high-grade heat energy is used for power generation, and low The high-grade heat energy is used for heating, which reduces the loss of the cold source, and it nearly doubles the fuel utilization rate of the simple Rankine cycle. [0003] Thermal power plants generally use back-pressure steam turbines or extraction and condensing steam turbines for heating. Back-pressure steam turbines do not have condensers, and all the steam entering the back-pressur...

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Problems solved by technology

[0004] But at the same time, due to the large amount of adjusted steam extraction during heating in winter, all the steam that has done part of the work for power generation is used for heating, and its thermal efficiency is very high; The steam generator is still cooled by the cooling water in the circulating water cooling system of the power plant. This part of the steam cooling source has a large loss, so the thermal efficiency is very low.

[0005] In addition, at present, electric pumps are mainly used for heating network circulation pumps in thermal power plants, and there is a problem of large power consumption

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