Method heat recovery

 

Method heat recovery includes the supply of steam to the steam turbine warm-up mode the installation and operation of labyrinth seals. In the warm-up steam turbine, the condensate outlet condensate pump serves on the entrance of the mixing chamber of the injector, heated by steam supplied from the output of the steam turbine to the inlet of the injector is formed in the injector, the mixture is pre-served in the starting container, after filling the starting capacity of the mixture from the output of the injector is fed into the deaerator. After warming up and reach the nominal capacity of the steam turbine installation in network water is heated by feeding to the input of the injector steam flowing with labyrinth seals. The invention will use the steam energy is irreversibly lost during the heating of the steam turbine and labyrinth seals that will allow you to achieve fuel savings and increase the efficiency of thermal power station. 1 C.p. f-crystals, 1 Il.

The invention relates to the field of energy and can be used for heat recovery in thermal and nuclear power stations.

Known method of waste heat, which consists in the discharge of steam through high-speed reductionby electric station. - M.: Energoizdat, 1967).

The main disadvantage of this method is that the energy of the pair is completely lost, heating the environment and degrading the environment.

The closest in technical essence and the achieved result of the present invention is a method of waste heat, including steam in the warm-up mode vocational and work labyrinth seals in the service water circuit (Ryzhkin C. J. Thermal power station. - M.: Energoizdat, 1967, S. 342, Fig.25-9).

This method is implemented in the existing schemes of TPPs and NPPs. Heating of the steam turbine (ST) to reach the nominal mode with cold or hot state when the warm turbine occurs with the discharge of steam from the steam generator through fast-response PRDS and ROWE in the condenser.

The main disadvantage of this method is that the energy of the steam is passed technical water, warming it. In the process heating process water associated with heat loss cycle and, consequently, reducing the efficiency of thermal power plants.

The technical result, which is aimed invention is to improve the efficiency of thermal power plants due to the increasing use of steam power, previously steam turbine condensate, supplied with the output of condensate pump is fed to the input of the mixing chamber of the injector, heated by steam supplied from the output of the steam turbine to the inlet of the injector is formed in the injector, the mixture is pre-served in the starting container, after filling the starting capacity of the mixture from the output of the injector is fed into the deaerator, and after heating of the steam turbine and its output rated power of the condensate is heated by feeding to the input of the injector steam flowing with labyrinth seals.

The achievement of the technical result is also due to the fact that the supply of mixture in the tank begin when the pressure in the starting capacity in excess of the pressure at the inlet to the deaerator, RPEPd.

The drawing shows a simplified diagram of a steam turbine unit (PTU), which shows a variant of the heat recovery through the use of steam for heating turbine and steam are provided with labyrinth seals.

The scheme includes: 1 - turbine, 2 - rail, 3 - tank 4 - condenser, 5 - condensate pump; 6 - bearings; 7 - labyrinth seal; 8 - starting capacity; B3 - starting valve; P1, P2, P3 - valves.

Heat recovery based on the use of the proposed sutsa with trigger valve v3 in the starting capacity of 8. After filling the starting vessel and the condition RPEPdthe injector 2 is automatically activated. In this case, steam is mixed in the mixer of the mixing chamber of the injector with the condensate and the resulting mixture is fed into the tank 3. After warming up PTU and its output rated power is applied command to close the valve P3 and opening P2. Thus, the circuit connects to dispose of heat by vapor flowing with labyrinth seals.

As an example, consider the waste heat at the power plant No. 3 of them. Klasson R. E., the Elektrogorsk, Moscow region. In this case, the scheme according to the drawing, in which pairs with labyrinth seals (open valve P2) with parameters P=0.25 MPa and a flow rate of 2.5 tons/hour and the condensation pressure of 0.6 MPa and a flow rate of 20 t/h are fed through the injector into the deaerator. As a result of implementation of the method of disposal in accordance with the scheme heat saving amounted Q=4,2109J.

Thus, the proposed method of disposal allows you to use the steam energy is irreversibly lost during heating PTU and labyrinth seals. When this occurs, the fuel economy and, consequently, improving the efficiency of thermal power plants. having a warm-up steam turbine installation and operation of labyrinth seals, characterized in that in the heating of the steam turbine, the condensate outlet condensate pump serves on the entrance of the mixing chamber of the injector, heated by steam supplied from the output of the steam turbine to the inlet of the injector is formed in the injector, the mixture is pre-served in the starting container, after filling the starting capacity of the mixture from the output of the injector is fed into the deaerator, and after heating of the steam turbine and its output rated power of the condensate is heated by feeding to the input of the injector steam flowing with labyrinth seals.

2. Method heat recovery under item 1, characterized in that the mixture flow to deaerator start when the pressure in the starting capacity in excess of the pressure at the inlet to the deaerator, PPEPdwhere RPEand Rd- pressure in the starting tank and deaerator, respectively.

 

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