The method of obtaining heat energy in steam power plant

 

The invention relates to a power system and can be used when creating steam power plants and modernization of existing ones. The method involves the transmission of a working steam through a steam turbine, which produces at least one intermediate steam extraction, condensation of the exhaust steam from the heat, the compression part of the exhaust steam, and the compression of exhaust steam from the turbine exhaust is carried out at operating conditions corresponding to 2-15% of the steam pass through a portion of the low pressure turbine, and the condensation of this vapor by heat is carried out after the compression. The invention improves thermal efficiency of steam power plants, as well as to improve its environmental performance. 1 Il.

The invention relates to a power system and can be used when creating steam power plants and modernization of existing ones.

Steam power plants, producing electricity and heat energy is supplied by intermediate extraction of steam for heating purposes. For their efficient work during the period of maximum heat load discharge steam into the condenser exhaust gas is, provide intermediate rounds compensate for the additional connection of the peak-load boilers.

The need to vent a pass, which, as a rule, is 5-8% of the steam flow supplied to the inlet of the turbine, lowers the efficiency of the low pressure turbine, requiring, in addition, pumping large amounts of water through the condenser. Connecting peak-load boilers require additional fuel consumption. Thus, additional heat reduces the efficiency of the turbine, and also affects the environmental performance of CHP.

Known thermal power plant (ed. mon. No. 800396, 3 IPC F 01 K 17/02, publ. 30.01.81) that implements the method of obtaining thermal energy, whereby carry out the transmission of a working steam through a steam turbine, which produces at least one intermediate steam extraction, condensation of the exhaust steam from the return of heat, the compression part of the exhaust steam using a steam jet compressor with its subsequent filing in one of the steps of the flow part of the low pressure cylinder.

However, the exhaust steam entering the steam jet compressor, taken partly from the intermediate selection, and the compressed íthe load on the turbine, in addition, the steam jet compressor has a low efficiency.

The invention solves the problem of increasing thermal efficiency of steam power plants, as well as improve its environmental performance.

To achieve the technical result of the proposed method of obtaining thermal energy in steam power plant, including transmission of a working steam through a steam turbine, which produces at least one intermediate steam extraction, condensation of the exhaust steam heat, compression, at least part of the exhaust steam, the compression of exhaust steam from the turbine exhaust is carried out at operating conditions corresponding to 2-15% of the steam pass through a portion of the low pressure turbine, and the condensation of this vapor by heat is carried out after the compression.

Distinguishing features of the proposed method to obtain heat energy in the steam power plant is that the selection of the spent steam is produced from the exhaust of the turbine at 2-15% of the steam pass through a portion of the low pressure turbine with its subsequent compression and condensation.

Exhaust steam at the exhaust of the turbine has the following parameters: pressure of 0.03-0.04 kg/cm

By increasing the quantity of steam passing through the low pressure in excess of 15%, increasing the turbine efficiency is not achieved because with this mode of turbine operation, there is no need for additional exhaust steam from the turbine exhaust, and compression of such a quantity of steam required too much power to drive the compressor. The lower limit steam flow through a portion of low pressure that is specified which is the amount of cooling water, pumped through the heat exchanger condenser requiring reset it in natural waters or emission of a certain amount of heat, which leads to improvement of the environmental performance of the installation.

The drawing shows a diagram of a steam power plant, which implements the specified method. The installation includes a set of typical elements of a fundamental thermal scheme of the power plant. The apparatus comprises a boiler 1 with external heat supply Q; boiler 1 is connected with a steam turbine 2 generator 3, with intermediate selection 4 pair, connected through a control valve 5 to the condenser 6, a heat exchanger 7 which is connected in a common circuit with the heat consumer 8 and the circulation pump 9, the output capacitor is connected to the condensate pump 10, the output of which is connected to the water treatment unit 11. The output of the steam turbine 2 is connected to the capacitor 12, heat exchanger 13 which is connected in a common circuit with the heat consumer 14 and the circulation pump 15, the output capacitor is connected to the condensate pump 16, the output of which is connected to the water treatment unit 11. Before the capacitor 12 has a drain pair 17 with regulating valve 5, Saedinenie consumer heat 21 and the circulation pump 22, the output capacitor is connected to the condensate pump 23, the output of which is connected to the water treatment unit 11, the output of the water treatment unit 11 is connected with a nutrient pump 24, the output of which is connected to the boiler 1.

The water treatment unit 11 steam power plant is provided for removing water contained in the gases, and salts of chlorides, sulfates and iron. Concrete block type of treatment chosen depending on the chemical composition of the water and the boiler type.

The method is as follows.

In steam power plant shown in the drawing, carries out a transmission pair obtained in the boiler 1 through the turbine 2, which produce intermediate selection pair 4, the heat which is given to the consumer 8 by pumping cooling water through the heat exchanger 7 of the capacitor 6 through the circulation pump 9, the resulting condensate is pumped out through the condensate pump 10 and supplied to the water treatment unit 11; the exhaust steam from the turbine exhaust is doing work, resulting in a rotation of the turbine 3, and then it is sent to the condenser 12, through heat exchanger 13 which by means of the circulation pump 15 is pumped cooling aceveda with condensate pump 16 and is sent to the water treatment unit 11. The steam flow through the intermediate selection 4 is controlled by the valve 5, so when will be the mode of operation in which the value passes through a portion of the low pressure turbine will meet 2-15% of the steam flow, the exhaust steam from the exhaust of the turbine 2 will be directed into the compressor 18, which is implemented by its compression and subsequent condensation and heat loss to the consumer 21 through heat exchanger 20 of the capacitor 19, the pumping of condensate is produced using a condensate pump 23 in the water treatment unit 11. The amount of steam directed into the compressor 18, is controlled by the regulating valve 5. In the water treatment unit 11 perform desalting and water deaeration, which then use the feed pump 24 is supplied to the boiler 1.

This method was tested on TEP-28 MOSENERGO. As shown by calculations, using it gives thermodynamic, environmental and operational benefits compared to other methods (e.g., the use of hot-water boilers) more heat during the period of increased heat loads, allowing you to reduce the cost of 1 kW of about 2 times.

Formula izyskanie working steam through a steam turbine, which produce at least one intermediate steam extraction, condensation of the exhaust steam from the heat, the compression part of the exhaust steam, characterized in that the compression of exhaust steam from the turbine exhaust is carried out at operating conditions corresponding to 2-15% of the steam pass through a portion of the low pressure turbine, and the condensation of this vapor by heat is carried out after the compression.

 

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