A new single-shaft natural gas combined cycle heating unit system

Abstract

The present invention relates to an urban energy supply system, in particular to a novel single-shaft natural gas combined cycle heat supply unit system, which includes a combustion chamber connected to a compressor connected to a generator I and a gas turbine connected to a waste heat boiler Connection, the waste heat boiler is connected with the thermal system of the condensing steam turbine and the thermal system of the back pressure machine, and the thermal system of the condensing steam turbine and the thermal system of the back pressure machine are respectively connected through the control system. The invention can realize safe and economical operation under two conditions of heating period and non-heating period, and the two operating modes are switched through the control system. In this way, on the basis of the original unit body that cannot be modified, the advantages of the back pressure unit are expanded to meet the heating demand during the heating period and meet the power generation requirements during the non-heating period. Using the back pressure machine for heating, the energy utilization rate is significantly improved, generally greater than 85%, and the operating efficiency is 25% higher than that of pure condensing.

Description

technical field [0001] The invention relates to an urban energy supply system, in particular to a novel single-shaft natural gas combined cycle heating unit system. Background technique [0002] There are many domestic operation examples of gas-steam combined cycle units. When it comes to heating transformation, many single-shaft units with generators arranged in the middle are used. Due to the combination of medium-pressure cylinder and low-pressure cylinder of the steam turbine, it is impossible to add steam extraction pipes for thermal The system is improved, and it is impossible to realize large-area heating. The feature of this type of unit is that it can operate in a single cycle of the gas turbine. At this time, the steam-water cycle runs through the bypass system. The steam turbine in the pure condensing mode does not enter steam, and the coupler is in a disconnected state. [0003] The characteristic of the back-pressure steam turbine is that the steam enters the s...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the gas-steam combined cycle unit currently used, the pure condensing steam turbine does not enter the steam; the back pressure steam turbine, the power generation of the unit is subject to the change of thermal load, and when the thermal load is low, the efficiency of the steam turbine body decreases. In order to solve the above problems, a new single-shaft natural gas combined cycle heating unit system is provided

Images