Operation method of low-load and flexible-operation combined heat and power generation steam turbine generator unit

Abstract

The invention discloses an operation method of a low-load and flexible-operation combined heat and power generation steam turbine generator unit, the efficiency of a low-pressure cylinder can be effectively prevented from being reduced when the steam turbine generator unit operates under a steam condensing working condition, the operation back pressure of the low-pressure cylinder can be increased when the steam turbine generator unit operates under a heat supply working condition, and the steam exhaust waste heat can be used for a heat supply system after being recycled. An asymmetric three-low-pressure-cylinder technology is adopted, and large, medium and small low-pressure cylinders are adopted; a non-traditional steam turbine generator unit shafting arrangement scheme is adopted, and a high-power clutch or a coupler capable of being rapidly disassembled / assembled is adopted in a matched mode. Four working modes of three-low-pressure-cylinder operation, double-low-pressure-cylinder operation, single-low-pressure-cylinder operation or zero-low-pressure-cylinder operation can be selectively achieved when the steam turbine unit operates under the condensing working condition; when the steam turbine generator unit system operates under a heat supply working condition and operates at a low load, part of the low-pressure cylinders are cut off, so that the unit volume flow of dead steam in the operating low-pressure cylinders is increased, and the requirement of a heat supply system is met.

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...

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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

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