Study on power load adjustment capacity of a 300MW cogeneration unit in heating season

Jinxu Lao,Haizhen Lv,Lingkai Zhu,Junshan Guo,Wei Zheng,Z Tan,L Liu

doi:10.1051/e3sconf/202132901006

Abstract

After the formulation of the "3060" double carbon target, the installed capacity of new energy has increased rapidly and the proportion of power generation has become higher and higher. In the heating season, under the operation mode of "determining electricity by heat" of cogeneration units, in order to meet the consumption of renewable energy and the heating guarantee of people's livelihood, the contradiction with power grid peak shaving is increasing. This paper mainly introduces the load capacity of a 300MW cogeneration unit in the heating season. Through the test method, find out the load capacity of the unit under different heating capacity, which can be used as a reference for power generation enterprises and power grid dispatching.

Highlights

BackgroundThe cogeneration unit uses high-grade energy for power generation, and the low-grade steam after power generation is used for industrial production or heating
Introduction to heating systemThe heating steam extraction of the four units in the plant is the exhaust steam extraction of intermediate pressure cylinder, and there is no industrial steam
In order to meet the consumption of renewable energy and the heating guarantee of people's livelihood, the contradiction with power grid peak shaving [2,3,4] is increasing

Summary

Background

The cogeneration unit uses high-grade energy for power generation, and the low-grade steam after power generation is used for industrial production or heating. It can meet the needs of production and life, and improve the comprehensive utilization efficiency of energy, and realize the policy of "proper distribution, different needs, corresponding temperature and cascade utilization" for energy. The cogeneration [1] unit itself has high energy efficiency, but limited by the operation mode of "determining electricity by heat", it reduces the peak shaving capacity of the power system. Taking a 300MW cogeneration unit as an example, its load capacity is obtained through test [5]

Overview of steam turbine equipment

Test process

Difference between actual output and design output

Heating working condition diagram

Findings

Conclusion