Combined heat and power generation system based on multi-heat-source coupling and adjusting method

Abstract

The invention discloses a combined heat and power generation system based on multi-heat-source coupling and an adjusting method. The combined heat and power generation system mainly comprises a combined heat and power generation unit, a condenser, an industrial steam user, a back pressure machine, a generator, a power grid, a steam type electrode boiler, a steam pressure reducing device, a steam buffering device, a steam-water mixed heating device, a circulating water pump, a steam-water heat exchanger, a water-water heat exchanger, a hot water heat storage device, a heating user, a photovoltaic power generation device, inversion control equipment and an electric energy storage device. The unit supplies steam to the industrial steam user and supplies heat to the heating user through an industrial steam supply pipe network at the same time, the power grid and photovoltaic power generation are used for generating steam to make up for heat supply of the unit, the heat storage device is used for making up for the space-time difference of electric heating loads of the unit, and energy gradient utilization is achieved through the back pressure machine. Through integration of combined heat and power generation steam supply and heat supply, the diversified and multi-grade heat using requirements of users are met, energy gradient utilization is achieved, the power peak load regulation capacity of the combined heat and power generation system is developed, and the market application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of cogeneration of heat and power, and in particular relates to a cogeneration system of heat and power based on multi-heat source coupling and an adjustment method, and is especially suitable for a cogeneration system of heat and power that simultaneously needs steam supply and heating. Background technique [0002] At present, in order to improve the comprehensive energy utilization efficiency of thermal power units and strive for more utilization hours of power generation, the conversion of pure condensing units to heat supply has been widely developed. However, for different industrial steam users, due to their different processes, the required steam pressure parameters are also different. For thermal power units, there is only one main pipeline for external steam supply, that is, only one external steam supply can be provided. Pressure parameter of steam. As a result, the steam supply parameters of the...

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Problems solved by technology

However, for different industrial steam users, due to their different processes, the required steam pressure parameters are also different. For thermal power units, there is only one main pipeline for external steam supply, that is, only one external steam supply can be provided. steam pressure parameter

As a result, the steam supply parameters of the thermal power unit do not match with the steam users, which not only cannot guarantee the steam demand of steam users, but also causes energy loss to a certain extent

In particular, the current rapid development of new energy power has more and more stringent requirements on the peak-shaving capability of thermal power units. The needs of the country's energy transition at this stage

[0003] In addition, in recent years, with the promotion of energy conservation and emission reduction in industrial parks and the rapid development of central heating, the high-pollution and low-energy-efficiency heating boilers in the original industrial parks have been gradually shut down and replaced by cogeneration centralized heating. However, the energy requirements for steam users and heating users are different. Generally speaking, for heating users, a hot water pipe network is laid, and for steam users, a steam pipe network is laid, resulting in a huge investment in pipe network construction.

[0004] To sum up the technical problems faced by the market, the main technical solutions are: the Chinese patent "High and Low Pressure Two-Stage Industrial Steam Extraction and Heating Device for Steam Turbine" with the application number 201310667813.1. However, the disadvantage is that two steam main pipelines need to be laid, which greatly increases the investment cost; especially, every time a steam pressure parameter requirement is increased, the same problem is faced

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