Combined heat and power generation system used for steam supply and heat supply coupling and heat load adjusting method

Abstract

The invention discloses a combined heat and power generation system used for steam supply and heat supply coupling and a heat load adjusting method. The system mainly comprises a combined heat and power generation unit, a condenser, industrial steam users, a steam cooling heat exchanger, back pressure machines, power generators, an electric heating type water heater, a drainage buffer device, circulating water pumps, a heating user, a steam-water heat exchanger, a water-water heat exchanger and a hot water heat storage device. The steam cooling heat exchanger and the back pressure machines are used for producing saturated steam and low-pressure steam correspondingly to supply the saturated steam and the low-pressure steam to the industrial steam users, industrial steam and steam drainage of the industrial steam users are used for supplying heat to the heating user, the back pressure machines and the power generators are used for driving power equipment to do work, and meanwhile the electric power peak regulation requirement of the combined heat and power generation unit is met through the hot water heat storage device. Through efficient integration of the combined heat and power generation steam supply process and heat supply process, the diversified and multi-grade heat utilization requirements of users are met, cascade efficient utilization of energy is achieved, and wide market application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of heat and power cogeneration, and in particular relates to a heat and power cogeneration system used for steam supply coupled with heating and a heat load adjustment method, and is especially suitable for a heat and power cogeneration system that requires both 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...

AI Technical Summary

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

[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

Images