SU821712A1 - Steam turbine plant - Google Patents

Description

I -.

The invention relates to a power system and can be used on heat and power plants with heat and power generation turbines with step heating of network water.

A steam turbine installation is known with steam outlets, to which regenerative heaters and an evaporator are connected, communicated via a secondary pair with an evaporator condenser connected via cooling water to a condensate path between regenerative heaters I.

The disadvantage of this setup is the insufficient performance of the vaporizer on the secondary pair under variable operating conditions.

Also known is a steam turbine plant containing a steam turbine with steam extraction, regenerative heaters and an evaporator connected to them, connected to a condenser of an evaporator that is connected to the cooling water line and the upper and lower network heaters equipped with a shut-off valve. .

between which a separation valve is installed in the path of the network water

The disadvantage of this installation with a heat-turbine turbine is the low evaporation rate of the evaporator when turning on the evaporator condenser through the cooling water into the main condensate path due to low condensate consumption during the heating period and abrupt change in steam pressure in the heat extraction samples depending on the outside air temperature. With a low evaporator heating pressure, the evaporator capacity is limited due to the low steam density, even at maximum permissible steam rates in the evaporator housing ...

The purpose of the invention is to increase the performance of the evaporator in all possible modes of operation of a steam turbine plant.

Claims (2)

This goal is achieved by the fact that the evaporator condenser is connected via cooling water to the net water path in front of the lower network heater, the supply and discharge pipes of the evaporator condenser are communicated with the additional pipe network to the network water path: the first between the NIZH1ShM network heater and the separation valve, and the second between the split-gate valve and the top of the network heater. The drawing shows the principle installation scheme. The steam turbine plant contains a steam cogeneration turbine (not shown) with selections 1 and 2 pairs, to which regenerative heaters (not shown) are connected, the upper and lower network heaters 3 and 4, and pipelines 5 and 6 of the heating steam - evaporator 7, reported via secondary steam pipeline 8 with a evaporator condenser 9 connected by pipelines 10 and 11 to the network water line 12, equipped with Gz and 14 dividing valves. Pipelines 10 and I are communicated by additional pipes 15 and 16 with the network water line 12 m Nizhny No forward network preheater 4 and the separation valve 13 and between the latter and the top. - network heater 3, respectively. The installation is equipped with a shut-off and regulating valve 17. 18, 19, 20, 21 and 22. The steam-turbine installation works as follows. When the unit is operating during a non-heating period (with the upper network heater 3 disconnected), the heating steam to the evaporator 7 is supplied from the bottom heat extraction selection 2 through the heating steam line 6, and to condense the secondary steam, it is fed to the separation valve 14. In the evaporator condenser 9, the water is supplied through pipe 11 to the inlet of the lower network heater 4. During the heating period, the heating heater is fed to the evaporator 7 through pipe 5 of heating steam from the surface for the condensation of the secondary steam, the condenser 9 of the evaporator is fed through an additional conduit 15 of the network. The water passed through the lower mains heater 4. After heating the evaporator 9 in the condenser 9, the water is fed via the additional conduit 16 to the inlet of the upper mains heater 3. TaicHM. in a non-heating period, the evaporator 7 is turned on for heating a couple of lower heat-extraction selection 2 and the condensation of the secondary steam is carried out by reverse supply water, and in the heating period the evaporator 7 receives heating The steam is switched on to the upper heat extraction 1 and the secondary steam condensation is carried out by the network water heated in the lower network heater 4. In this case, in all operating modes of the steam turbine installation, the evaporator 7 operates with minimal heat loss. At the same time, it is possible to ensure high performance of the evaporator in all modes and to keep it constant at various heating plants of a steam turbine plant. An increase in evaporator productivity leads to a decrease in the cost of the distillate and an increase in the efficiency of the steam turbine plant. The invention includes a steam turbine plant comprising a steam turbine with steam extraction, regenerative heaters and an evaporator connected to them, a evaporator condenser connected to the latter through the secondary steam, which is connected with supply line and outlet pipelines equipped with a shut-off valve to the cooling water line, the upper and lower network heaters between which a separation valve is installed in the path of the supply water, characterized in that, in order to increase the capacity, the evaporator condenser is under Switched over cooling water to the mains water path in front of the lower mains heater, supplying and discharging the condenser tubes of the evaporator are connected by additional mains with the mains water path: the first between the lower mains heater and the separating valve, and the second between the separating, gate valve and the upper mains heater . Sources of information taken into account in the examination 1. Germany patent number 853590, cl. 12 b 14/01, publ. 1952, 2.Tubnsky L.I., Frenkel L.D. High-pressure steam turbines LMZ them. Stalin. Design and maintenance. M.-L. Gosenergoizdat, 1953, p. 215, 224, FIG. 126.