Thermodynamic system for improving heat supply unit electric output adjusting capacity

Abstract

The invention relates to a thermodynamic system for improving heat supply unit electric output adjusting capacity. The thermodynamic system is characterized in that main steam or reheating section steam is subject to temperature and pressure reduction to directly serve as heat source steam for industrial heat users; an absorption heat pump 23 of a first-stage heat exchange device serves as a heatsource of a first-stage heat exchange station 25 in the heating period to supply heat to heat users 29 and supplies cold to the users in the non-heat supply period; a high-pressure electric boiler 24of a second-stage heat exchange device improves the boiler water feeding temperature, reduces heat absorbed by boiler fed water in an economizer 4, accordingly improves the boiler tail smoke discharging temperature, and guarantees normal running of an SCR denitration device 5; and according to a three-stage heat exchange device, exhaust steam of a turbine intermediate pressure cylinder 8 serves asheat source steam of a third-stage heat exchange station 27, the unit heat load is guaranteed, and the heat using requirement of the heat users 29 is met. The electric output adjusting capacity of the heat supply unit can be improved, it is guaranteed that the unit heat supply capacity is not decreased under the low load running working conditions, pyroelectric decoupling is achieved, and the electric output adjusting capacity of the heat supply unit is improved.

Description

technical field [0001] The invention relates to the technical field of cogeneration and heat supply of coal-fired power units, and relates to a thermodynamic system for improving the power output adjustment capability of a heating unit. Background technique [0002] With the rapid development of society and economy, the consumption of energy continues to increase, and the energy transformation of replacing traditional energy with new energy has attracted worldwide attention. With its outstanding technical and economic advantages, wind energy has gradually become the mainstream of new energy power generation. The development of wind power installed capacity has also brought adverse effects. The difficulty of wind power grid connection and consumption, and the increasing amount of abandoned wind have gradually become prominent, which has become a major challenge restricting the healthy development of wind power in China. Due to the distribution characteristics of my country's ...

AI Technical Summary

Problems solved by technology

When the steam extraction heating unit is in the operating state of "heat-based power", the unit has low flexibility, it is difficult to adjust the unit's electrical load, and it cannot provide space for wind power grid connection, and the ability to adjust the power output is seriously insufficient

[0005] The structure after the system transformation of the peak-shaving capacity of the existing heating units is as follows: image 3 As shown, there are still many problems. The main steam enters the peak heater C through the pressure reducer, and the main steam is directly used as the working heat source steam. It is simply to increase the heat load of the unit on the basis of ensuring the electrical load, without making substantial progress. The improvement of the peak-shaving capability of the unit is only slightly improved, and the peak-shaving capability is still insufficient. At the same time, the main steam is used as the working heat source steam, which does not consider the economy of the system. At the same time, the feed water temperature is ignored, and the SCR cannot be guaranteed. Normal operation of the denitrification device

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