SU1333782A1 - Method of steam turbine plant operation - Google Patents

Abstract

The invention allows to increase the efficiency of the installation. When switching the unit to the operation mode according to the thermal schedule, simultaneously with the start of recirculation, the steam suction is switched from the stuffing boxes 19 to the heater 8 of low-level supply water. Based on the conditions of t-ply expansions of the pipe 24, the steam is cooled in the cooler 26, the main condensate is supplied to it to cool the steam in front of the preheater 8. 1 hp f-ly, 1 ill. (L

Description

The invention relates to a power system and can be used in the operation of heat and power generation turbine plants.

 The purpose of the invention is to increase the efficiency of a steam turbine plant,

The drawing shows a schematic diagram of a steam turbine plant for implementing this method.

The steam turbine plant contains high, medium and low pressure cylinders 1, 2 and 3, having selections 4 for regenerative heaters (not shown) and selections 5 and 6 of different potential for heaters 7 and 8, of network water. After the condenser 9, the pumps 10- are connected in series along the main condensate, the main ejector cooler 11, the packing heater 12, the packing cooler 13, the recirculation valve 14 of the condenser to which the recirculation pipeline 15 is connected. The end seals 16 and 17 of the turbine have vapor-air mixture suction chambers 18 on gland heater 12, gland vapor sump chambers 19 on gland cooler 13, steam supply (suction) chambers 20 from sealing manifold 21, Tubopropog 22 vapor suction on gland cooler 13 before the valve 23 is connected to the pipe 6 to supply steam to the heater 8 of the network water. The pipeline 24 can be installed valve 25 and the cooler 26 of the mixing type, which is supplied to the injection of the main condensate.

Steam turbine installation works as follows,

In the operation mode of the turbine, according to the electric schedule, fresh steam is fed successively to cylinders 1, 2 and 3 and is condensed in a condenser 9 cooled by circulating water. Part of the steam from the turbine is diverted to selections 4 for regenerative heaters, and some steam to selections 5 and 6 for heaters 7 and 8 of the supply water. From the condenser 9, the main condensate is pumped through pumps 10 through the cooler 11 of the main ejector, the packing heater 12J, the packing cooler 13, and then into the regenerative heaters. In these modes, due to the considerable consumption of condensate

0

five

0

recirculation pan 14 is closed. Steam suction from the packing chambers 19 and the sealing seals 16 and 17 are directed to the packing cooler 13, where it condenses, giving off heat to the main condensate, heating the latter before being fed to the regenerative heaters. The suction of the vapor-air mixture from the chambers 18 is directed to the gland heater 12, and to the chambers 20, for example, steam is supplied from the manifold 21,

When switching to the heat schedule mode, the steam flow rate from cylinder 3 to condenser 9 is kept at the lowest possible level. For normal operation, the cooler 11 of the main ejector, the gland heater 12 opens the condensate recirculation valve 14 (the recirculation is started), the bypass last By means of the pipeline 15 to the condenser 9, Simultaneously with the opening of the valve 14, the valve 23 is closed on the steam suction pipe 22, stopping steam to the stuffing box cooler 13, open the valve. 25 and steam is directed (switch

0 steam suction) from the stuffing boxes 19 into the heater 8 of the lowest-potential network water.

Based on the conditions of temperature expansions of the pipeline 24, the cooling 5 gives steam in the cooler 26, the supply

0

to it is the main condensate for cooling the steam before the preheater 8.

Claims (1)

Invention Formula 1, Method of operation of a steam turbine plant according to electrical and heat graphics by supplying steam to the turbine cylinder and condensing it in a condenser with cooling the latter with circulation water, removing steam from the turbine to regenerative heaters and network water heaters, feeding the main condensate through the main ejector cooler, gland heater and cooler and recirculation with low steam consumption to the condenser, suction of the steam-air mixture from the final chambers of the end seals to the gland heating Tel and a pair of stuffing boxes on the stuffing box cooler, steam supply (suction) 0 five 313337824 from the seal collector (in the collection, steam suction from the packing packing seals are transferred) to the sealing chambers to the network water heater (from the sealing chambers) end packs-low potential, lengths different from 2, Crtoco6 according to claim 1, different that, in order to increase the economical condition, so that the steam is out of greasiness, when the unit is transferred to reclaimer chambers, it is cooled before feeding the work on the heat schedule to it in the network heater at the same time as the recirculation starts. .