Large-scale thermoelectric decoupling technology has become the development trend of heating units. Taking a subcritical 330 MW heating unit as an example

from the view of technical principles

technical characteristics and application performance

conventional thermoelectric decoupling technologies of heating units such as bypass heating system of high and medium pressure cylinder

heat accumulator

electric boiler and low pressure cylinders with zero-output are summarized

discussed and comparatively analyzed. The technology of bypass heating system of high and medium pressure cylinder suits for all coal-fired heating units. However

the safety and reliability of the pressure reducer

regulating valve and corresponding piping system need further study and field demonstration. When the heating units equipped with heat accumulator or electric boiler

optimization design should be implemented according to the local power grid situation

peak regulation policy

heat load and other factors. The heating technology of low pressure cylinders with zero-output applied for thermoelectric decoupling technologies of heating units shows significant advantages of the lowest cost

best thermal economy and largest comprehensive advantages. It is recommended that the most suitable thermoelectric decoupling solution should be determined from the unit's own actual situation.