Heat exchange complex of steam turbine plant

FIELD: power engineering.

SUBSTANCE: heat exchange complex of a steam turbine plant comprises a system of main condenser cooling, which comprises the following components serially connected with a cooling pipeline: an ice box, a circulating pump, the main condenser and a drain box, and also a condensate system comprising the main condenser, a condensate pump, a low-pressure feedwater heater and a deaerator, serially connected with a condensate pipeline, besides, the main condenser cooling system is arranged as closed and is equipped with an off-board heat exchanger installed in the ice box. Also the main condenser cooling system comprises a closed circuit of secondary coolant, which is equipped with a low-pressure feedwater heater of the condensate system.

EFFECT: invention makes it possible to increase energy efficiency of a vessel.

4 cl, 1 dwg

 

The invention relates to the field of ship power plants, and more particularly to a heat transfer complexes of marine steam turbines and can be used for cooling the steam in the main condenser and heating the condensate in the condensate-feedwater systems that use a combination of heat exchange circuits saltwater and freshwater mainly for ice ships and structures for the development of offshore oilfields with the steam-turbine power plants and steam turbine drives technological equipment installed on the upper storeys of the buildings, and the issue of energy efficiency of the vessel.

Known heat-exchange complex in the composition of the cooling system condenser steam turbine and condensate system. The cooling system contains the Kingston ice box, casting box, circulating sea water pump, heat exchanger (condenser), connected in series adoptive and otlivnyy piping sea water. Condensate system contains connected in series condensate pipeline main condenser, condensate pump, regenerative feedwater heaters low pressure and deaerator (Haaramo "System of ship power plants", HP, "Shipbuilding", 1980) -a prototype is. These systems in the known heat exchangers have complex simplicity, reliability and are widely used in almost all steam vessels. However, the heat-exchange complex has drawbacks. The disadvantage of the cooling system is the inability or inefficiency of its application in cases where the heat exchanger is, for example, on the upper deck, i.e. significantly above the current waterline, and filing axial outboard water circulation pump for cooling is not possible or the cost of power to drive the circulation pump will be excessive, which will adversely affect the efficiency of the power plant. The disadvantage of the cooling system of the main capacitor is that a large amount of heat is transferred from the steam condenser to sea water and is lost. The disadvantage of the condensate system is the need steam for feedwater heating in the low pressure heater. The above mentioned disadvantages of the heat exchange complex limit the efficiency of thermodynamic cycle efficiency of the ship as a whole.

Object of the present invention is to eliminate the above drawback, namely the energy efficiency of the vessel.

This is achieved in that in the heat exchange complex Pareto what Binney installation containing cooling system main condenser comprising series-connected cooling pipe ice (Kingston) drawer, circulating pump, main condenser and otlishnogo mailbox and condensate system in the main condenser, condensate pump, feed water heater low pressure tank connected in series condensate piping, cooling system main condenser is made closed and equipped with outboard heat exchanger, installed in the ice box, and outboard heat exchanger consistently integrated into the cooling pipe in the course of the environment between the main condenser and circulating pump. In addition, in the cooling system main condenser entered a closed loop secondary coolant, which is supplied serially connected downstream secondary coolant throttle device, a heat exchanger, the evaporator and the compressor, and in the specified path built along the secondary coolant feedwater heater low pressure condensate system between the compressor and the throttle device along the line of its heating medium, the heat exchanger-evaporator is integrated in the cooling pipe between the main condenser and outboard heat exchange is the IR in the course environment. Along with this, the cooling system main condenser entered the bypass pipe connected in parallel with the outboard heat exchanger. In the cooling system main condenser entered the sea water pipeline connecting the ice box otlivnyy drawer, and casting box is mounted on Board a vessel with a maximum elevation operating under the waterline.

Introduction to heat transfer complex heat exchanger-evaporator allows useful to use low-grade heat transferred to the cooling water by condensation in the main condenser in the turbine exhaust steam, reducing, thus, the heat dissipation outboard water.

Introduction to heat transfer complex of a closed loop secondary heat integration in the circuit of the heater feed water low pressure allows heat to transfer from the heat exchanger-evaporator in the heater feed water low pressure, ensuring in this way, heating of the condensate without the use of heating steam.

Introduction to heat transfer complex bypass pipeline, connected in parallel with outboard heat exchanger allows to provide optimal thermal conditions for heat-exchange complex.

Introduction to heat transfer complex piping outboard of water between ice Amico and otlivnyy box improves heat transfer conditions in the outside heat exchanger.

The essence of the invention illustrated by the drawing, in which figure 1 shows schematically the proposed heat-exchange complex of a steam turbine installation.

Heat-exchange complex steam turbine includes a cooling system of the main capacitor 1 and the condensate system 2. Cooling system (see figure 1) contains the main condenser 3 steam turbine outboard heat exchanger 4 in the ice box 5, pump 6, connected in series with a closed pipe 7. In line 7 also incorporates a heat exchanger-evaporator 8 with attached closed loop 9 of the secondary coolant by-pass pipe 10, the shut-off and control devices 11, 12 and 13, as well as a charging device 14. The sea water pipeline 15 connects the ice box 5 otlivnyy box 16 mounted on the Board at maximum elevation, providing its location below the waterline at any permitted operation at maximum draught and the estimated changes in the pitch and roll of the vessel.

Condensate system includes sequentially connected by pipeline to the main condenser 3 steam turbine condensate pump 17, the heater feed water low pressure 18 and tank 19. The feedwater heater 18 by line heating medium is embedded in a closed loop secondary teplonositel is 9, which also has a built-heat exchanger-evaporator 8, the compressor 20, the throttle device 21 and are connected to the line 22.

Heat-exchange complex is as follows.

When submitting the exhaust turbine steam in the main condenser 3 is cooled fresh water circulating in a closed pipe 7 due to the pressure created by the circulation pump 6. The fresh water cooling intermediate circuit occurs in the outside heat exchanger 4, also in the heat exchanger-evaporator 8. The allocation of costs of fresh water through the outside heat exchanger 4 in the ice box 5 and the bypass pipe 10, depending on the conditions of heat exchange, is provided shut-off and control devices 11, 12 and 13. The cooling pipe system outboard of the heat exchanger 4 from the outer side and a constant exchange of fresh water in the ice box 5 through the pipe 15 due to the natural circulation due to the difference in the densities of sea water in the pipe 15 and outboard space due to different temperature values. In other words, the pipeline 15 and outboard space form a circulation loop. The intensity of the natural circulation depends, in particular, the height of the water column in the pipe. In our case the height of the water column in the pipe 15, based on the precipitation of miscigenation ship type, in operation, exceeds 10 m, which provides sufficient efficiency circulation. The heat in the heat exchanger-evaporator 8 is provided with a closed circuit secondary coolant, which works on the principle of a heat pump (Appaulse Marine refrigerating machines and installations", HP, "Shipbuilding", 1969). In the heat exchanger-evaporator 8 is the evaporation of the secondary fluid (boiling liquid). The resulting steam fraction of the coolant supplied to the compressor 19, where the compression of the fluid, accompanied by his heat. Further, the coolant enters the feedwater heater 18, which is the condenser of the heat pump. In the feedwater heater 18, the coolant partially condenses, giving up heat to the condensation of water vapor in the composition of the condensate system 2. Further, the vapor-liquid mixture flows in the throttle device 21, where the pressure drops while cooling the coolant, which is then returned to the heat exchanger-evaporator 8. Heated in the heater feed water low pressure 18 condensate is then fed into the tank 19. Further, the preparation of heated condensate (for feed water) to power a steam boiler is carried out by known circuits. When changing the main power turbine from inalsa steam consumption and accordingly, the consumption of cooling water. Another factor in determining the required flow rate of cooling water is the temperature sea water. The stabilization of the conditions of heat transfer when changing these factors is achieved by changing the ratio of water flow through the outside heat exchanger 4 and the bypass pipe 10 with the use of shut-off and control devices 11, 12, 13, which allow modes remote or automatic control to provide optimal thermal conditions for heat exchange complex.

The proposed heat exchanger complex steam turbine allows to improve the energy efficiency of the ship, which distinguishes it from the prototype.

1. Heat exchange complex of a steam turbine plant comprising a cooling system of the main capacitor in the composition of the ice (Kingston) drawer, circulating pump, main condenser and otlishnogo box, connected in series refrigerant piping and condensate system in the main condenser, condensate pump, feed water heater low pressure deaerator, serially connected pipeline, characterized in that the cooling system main condenser is made closed and equipped with outboard heat exchanger installed in the ice box, and outboard heat exchanger consistently integrated into the cooling pipe in the course of the environment between the main condenser and circulating pump.

2. Heat transfer complex according to claim 1, characterized in that the cooling system main condenser entered a closed loop secondary coolant, which is supplied serially connected downstream secondary coolant throttle device, a heat exchanger, the evaporator and the compressor, and in the specified path built along the secondary coolant feedwater heater low pressure condensate system between the compressor and the throttle device along the line of its heating medium, the heat exchanger-evaporator is integrated in the cooling pipe between the main condenser and outboard heat exchanger in the course environment.

3. Heat-exchange complex steam turbine according to claim 1, characterized in that the cooling system main condenser entered the bypass pipeline is included in the circuit in parallel with the outboard heat exchanger.

4. Heat-exchange complex steam turbine according to claim 1, characterized in that the cooling system entered the sea water pipeline connecting the ice box otlivnyy drawer, and casting box is mounted on Board a vessel with a maximum elevation to operate under the operating waterline.



 

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