An operation method of a low-load flexible operation combined heat and power turbogenerator set

Abstract

The invention discloses an operation method of a cogeneration steam turbine generator set with low load and flexible operation, which can effectively suppress the efficiency decrease of the low-pressure cylinder when operating in the condensing working condition, and can raise the low-pressure cylinder when operating in the heating working condition The operating back pressure is sufficient to meet the exhaust steam waste heat recovery and use it in the heating system. Adopt asymmetrical three low-pressure cylinder technology, three kinds of low-pressure cylinders: large, medium and small; adopt a non-traditional steam turbine generator set shaft arrangement scheme, cooperate with a high-power clutch or a coupling that can be quickly disassembled / installed; make the steam turbine set Four operating modes of three low pressure cylinders, double low pressure cylinders, single low pressure cylinder or zero low pressure cylinders can be selectively realized when operating under condensing steam conditions; During low-load operation, part of the low-pressure cylinder is removed to increase the unit volume flow rate of exhaust steam in the low-pressure cylinder to meet the requirements of the heating system.

Description

technical field [0001] The invention relates to an operation method of a steam turbine generator set, in particular to an operation method of a heat and power cogeneration steam turbine generator set which operates flexibly at low load. Background technique [0002] Today, with the rapid development of low-carbon economy and clean energy technology, on the one hand, the energy consumption side requires the flexible operation of the turbo-generator set as low as possible, and on the other hand, it also needs the steam-turbine-generator set to recover as much waste heat as possible; The low-load flexible operation of the turbine generator set requires a back pressure of 10kPa.a or lower to reduce damage to the final blade of the low-pressure cylinder due to phenomena such as water erosion and flutter, while the utilization of exhaust steam waste heat requires a back pressure of 30Pa.a or higher , so that the temperature of the exhaust steam can be used for heating; because the...

AI Technical Summary

Problems solved by technology

[0002] Today, with the rapid development of low-carbon economy and clean energy technology, on the one hand, the energy consumption side requires the flexible operation of the turbo-generator set as low as possible, and on the other hand, it also needs the steam-turbine-generator set to recover as much waste heat as possible; The low-load flexible operation of the turbine generator set requires a back pressure of 10kPa.a or lower to reduce the damage to the final blade of the low-pressure cylinder due to phenomena such as water erosion and flutter, while the utilization of exhaust steam waste heat requires a back pressure of 30Pa.a or higher , so that the temperature of the exhaust steam can be used for heating; because the safe operation back pressure value of the low-pressure cylinder of the turbo-generator set is approximately proportional to the steam intake of the low-pressure cylinder, and approximately inversely proportional to the power generation load of the turbo-generator set, therefore, the traditional It is difficult for the turbogenerator system to reconcile the contradiction between flexible low-load power generation and high back pressure exhaust steam waste heat utilization; when the steam intake of the low-pressure cylinder of the traditional turbogenerator is lower than 30%, not only the thermal power conversion efficiency drops seriously, but also The final stage blades in the low-pressure cylinder are easily damaged by water erosion and flutter, etc. How to solve this problem is a difficult problem faced by the site; in addition, how to safely increase the back pressure of the low-pressure cylinder when the turbo-generator system is operating at low load , to recover exhaust steam waste heat for heating, is another difficult problem to be solved

Images