RU2596072C1 - Thermal power plant - Google Patents

Abstract

FIELD: energy.

SUBSTANCE: invention can be used at thermal power plants. Thermal power plant includes a cogeneration turbine with heating steam extractions, connected via steam lines with top and bottom network heaters connected via heated medium in a network pipeline, vacuum deaerator of make-up water of heat supply system with pipelines of initial and deaerated water connected to pipeline of initial water heater. Heater for heating initial water via heating medium is connected in a network pipeline between top and bottom network heaters.

EFFECT: higher efficiency of thermal power station due to use for heating initial water before vacuum deaerator of make-up water of heating system of heat carrier, heated by steam of low capacity, as well as increasing electric power generation on heat consumption due to reduction of heating water temperature before upper network heater.

1 cl, 1 dwg

Description

The invention relates to the field of power engineering and can be used at thermal power plants.

A well-known analogue is a thermal power station containing a cogeneration turbine with steam heating, connected by steam lines to the lower and upper network heaters, connected via a heated medium to the network pipe, a vacuum deaerator of the heating system’s make-up water with pipes of the source and deaerated water, the heater included in the source water pipe source water connected through a heating medium to a steam line for constant pressure selection (see patent for invention No. 1267015, IPC F01K 17/02, 1986). This analogue is adopted as a prototype.

The disadvantage of the analogue and prototype is the reduced efficiency of the thermal power plant due to the use of steam of a sufficiently high potential for heating the source water in front of the vacuum deaerator of the make-up water of the heating system.

The technical result achieved by the present invention is to increase the efficiency of a thermal power plant by using a heat carrier heated by low potential steam to heat the feed water in front of the vacuum deaerator, as well as by increasing the electricity generation from heat consumption by lowering the temperature of the mains water in front of the upper network heater .

To achieve this result, a thermal power plant is proposed that includes a cogeneration turbine with heating steam extraction connected by steam lines to the lower and upper network heaters connected via a heated medium to the network pipeline, a vacuum deaerator of the heating system’s make-up water with the source and deaerated water pipelines included in the source pipe water source water heater.

The peculiarity lies in the fact that the source water heater in the heating medium is included in the network pipeline between the lower and upper network heaters.

Next, we consider the information confirming the possibility of carrying out the invention with obtaining the desired technical result.

The drawing shows a schematic diagram of a thermal power plant, explaining the installation. The station contains a steam boiler 1, a cogeneration turbine 2 with steam extraction, which are connected to the lower 3 and upper 4 network heaters. To the vacuum deaerator 5 of the make-up water of the heating system, the pipelines of the initial 6 and deaerated 7 water are connected. The feed water heater 8 is included in the pipe 6, which is included in the heating pipe 9 between the lower 3 and upper 4 network heaters in a heating medium.

Thermal power station operates as follows.

The steam generated in the boiler 1 is sent to the cogeneration turbine 2. The mains water is heated by the steam from the heating taps of the cogeneration turbine in the lower 3 and upper 4 network heaters. Losses of network water in the heating system are made up for with deaerated make-up water, which is deaerated in the vacuum deaerator 5 of the heating system’s make-up water, for which feed water and a heating agent are heated in the heater 8 to the technologically necessary temperature (35-40 ° C). As the heating medium in the heater 8, network water is used after the network heater 3. The deaerated make-up water from the deaerator 5 is sent to the network pipe 9 in front of the lower network heater 3.

The heating of the source water in front of the vacuum deaerator with network water heated by low-grade steam of the lower heating selection in the lower network heater leads to a decrease in the temperature of the network water in front of the upper network heater, an increase in the generation of electricity at thermal consumption and, as a result, to an increase in the efficiency of the thermal power plant.

Thus, the proposed solution makes it possible to increase the efficiency of a thermal power plant by using a heating medium heated by low potential steam, as well as by increasing the generation of electricity for heat consumption, for heating the source water in front of the vacuum deaerator of make-up water.

Claims (1)

A thermal power station containing a cogeneration turbine with heating steam extraction connected by steam pipelines to the lower and upper network heaters connected via a heated medium to the mains pipeline, a vacuum deaerator of the heating system’s make-up water with pipelines of the source and deaerated water, the source water heater included in the source water pipeline, characterized in that the source water heater in a heating medium is included in the network pipe between the lower and upper network heaters .