The method of operation of a combined-cycle plant

 

The method relates to a power system, in particular to combined-cycle units operating on a mixture of steam and combustion products, and can reduce heat loss and water in the environment. In the method of operation of a combined-cycle plant, including the establishment of a working gas mixture, the expansion of the latter in the turbine with the performance of work, the drainage flow of the vapor-gas mixture by introducing water with a temperature below the condensation temperature of water vapor mixture, removal of the drained gas and condensate drain, flow initially drained gas mixture additionally injected water with a temperature of 15-40oWith lower temperature initially entered the water and with a flow rate of 1.5-5 times lower consumption initially entered the water. 1 Il.

The invention relates to a power system, in particular to combined-cycle units operating on a mixture of steam and combustion products.

The known method of operation of a combined cycle plant including the establishment of a working gas mixture, the expansion of the latter in the turbine with the performance of work, the drainage flow of the vapor-gas mixture by introducing water with a temperature below the condensation temperature of water in gas-vapor mixtures is p>

The disadvantages of this method are: high losses of heat (latent heat of vaporization), as not all water is removed (lands) of the gas mixture and water for niedokladnie gas mixture. When planting from vapor-gas mixture the required amount of water by a known method would need to submit a considerably large amount of cold water. This in turn will lead to the fact that water is drained from the condenser is also cold, so the heat is returned through the utilization circuit will be reduced, i.e., more heat will be lost to the environment and more energy must be expended to obtain cold water.

The objective of the invention is the reduction of losses and heat water in the environment.

This technical result is achieved in that in the method of operation of a combined-cycle plant, including the establishment of a working gas mixture, the expansion of the latter in the turbine with the performance of work, the drainage flow of the vapor-gas mixture by introducing water with a temperature below the condensation temperature of water vapor mixture, removal of the drained gas and condensate drain, flow initially drained gas mixture Supplement is 5 times lower consumption initially entered the water.

These ratios allow the temperature rise initially entered the water, and to reduce the total number of circulating water, and, consequently, to provide a complete planting water from the steam and gas mixture to raise the temperature of the discharged water, the degree of utilization of exhaust gas heat, and reduce the cost of cooling the circulating water. Moving beyond the specified ratio technical result is not achieved, as hypothermia and wastage additional input of water leads to a decrease in profitability due to substantially higher costs associated with cooling water and niedokladnie this water and its deficiency leads to increased water loss and heat with the exhaust gases.

The drawing shows the installation for the implementation of the proposed method.

Combined-cycle power plant comprises a gas turbine engine with a compressor 1, a combustion chamber 2 and the turbine 3, running on a mixture of steam and products of combustion, boiler 4, pump 5, the capacitor 6 with the main nozzles 7 and additional nozzles 8, the circulation pump 9, the refrigerator 10 and 11, the vacuum pump 12, a turbine 13, the pipes 14, 15 water supply to the condenser 6 pipeline as follows.

Atmospheric air enters the compressor 1, which is compressed, and is fed into the combustion chamber 2, which simultaneously injected fuel. Hot gases in the combustion chamber 2 is mixed with the steam coming from the boiler 4. Formed a working gas-vapor mixture from the chamber 2 combustion flows into the turbine 3, which is expanded with the performance of work, resulting in a rotation of the turbine 13 and the vacuum pump 12. After the turbine 3 hot gas-vapor mixture enters the heat-exchanger 4, where it is cooled to the temperature 130-90oC. After the waste heat boiler 4 gas-vapor mixture enters the condenser 6, where the pipeline 14 through the nozzles 7 water, and is the initial dewatering of the stream of gas mixture. Moreover, the water flowing into the condenser 6 through the nozzles 7, cools the gas-vapor mixture to a temperature slightly below the temperature of condensation of water. The remains neskondensirovannyh water disembark from the exhaust gases by the introduction of additional water into the condenser 6 through the pipe 15 through the nozzles 8. Thus water entering the condenser 6 through the nozzles 8, has a temperature of 15-40oWith lower temperature initially entered the water and its flow rate is 1.5-5 times lower consumption perform the pump 12 and released into the atmosphere. Water (condensate) on the pipeline 16 is removed from the contact condenser 6. Part of the drained water (condensate) by the pump 9 through the pipe 17 through the coolers 10, 11 is applied again in the contact condenser 6 to meet the steam flow, and the other part is drained of water (condensate) nutrient pump 5 via the pipeline 18 is fed to the HRSG 4, where, taking heat from the steam-gas mixture from the turbine 4, is converted into steam. Steam from the boiler 4 through the steam line 16 is fed into the combustion chamber 2.

Depending on the design of the contact condenser entering water may be in the form of sprays, drops, spray, mist, etc.,

The direction of flow of water are initially introduced into a condenser, in relation to the direction of water flow, additional input may be chosen depending on the design of the capacitor, in particular depending on the availability of various devices wetting and surface cooling (blinds, mesh bags, and so on).

The introduction of additional water may be carried out for the initial introduction of water into the condenser in the direction of gas flow in the condenser at a different distance, selectable depending on the design of the capacitor, in particular in tyle="text-align:center; margin-top:2mm;">Claims

The method of operation of a combined-cycle plant, including the establishment of a working gas mixture, the expansion of the latter in the turbine with the performance of work, the drainage flow of the vapor-gas mixture by introducing water with a temperature below the condensation temperature of water vapor mixture, removing the dried gases and condensate, characterized in that the thread is initially drained gas mixture additionally injected water with a temperature of 15-40oWith lower temperature initially entered the water and with a flow rate of 1.5-5 times lower consumption initially entered the water.

 

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