CZ2005382A3 - Circulation of steam-and-gas mixture with steam generator and heat transformer - Google Patents

Abstract

The outlet port of the high-pressure turbine (1) is connected by a steam-gas mixture line (16) to the primary side of the steam generator (5) and further to the heat transformer (6), the secondary side of the steam generator (5) being connected to the raising pump (10) and the high-pressure by steam line (18) to the high pressure steam module (2). At least one additional steam generator is arranged between the steam generator (5) and the high pressure module (1). In one body, at least one steam generator (5) can be co-located with the heat transformer (6).

Description

STEAM GAS CIRCUIT WITH STEAM GENERATOR AND HEAT TRANSFORMER

Technical field

The invention relates to the field of mechanical power production, co-production of mechanical energy and heat and other technological operations such as petrochemistry, food industry and gas production.

BACKGROUND OF THE INVENTION

In connection with the growing problem of warming our planet, we can see efforts to limit the amount of carbon dioxide and other hazardous substances emitted into the atmosphere. New technologies are being developed, its working substances are not air, but pure substances such as fuel, oxygen, water, resp. carbon dioxide. Abroad they are also referred to as CES systems. One of these is the steam-gas turbine cycle, which is described in PV 2001 3331. Here, the fuel with oxygen is combusted at high pressure and temperature. Water is injected into the flue gas, thus creating a mixture of superheated water vapor and carbon dioxide, a steam-gas mixture (hereinafter referred to as PPS), which enters the heat machine-turbine.

Of the heat energy that is circulated through the working medium, only part of it can be converted to mechanical energy. According to thermodynamic laws, the proportional properties of a substance - specific heat capacity, its temperature in front of a thermal machine turbine and the ratio of pressures in front and behind the machine.

Maximum circulation pressure - at the inlet to the turbine, is limited by the properties of the material from which the machine is made and which can be used for a given temperature.

The pressure at the outlet of the machine is selected such that the condensation of the steam portion from the carbon dioxide mixture takes place in a subsequent heat transformer at a pressure higher than ambient pressure at atmospheric pressure. This ensures that carbon dioxide does not have to be extracted from the heat transformer, which requires some energy but can only be discharged from the circulation

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These limitations determine the pressure ratio of the high-pressure portion of the steam-gas turbine, which is one of the main reasons why it cannot effectively utilize all the thermal energy contained in the steam-gas mixture at the outlet of the high-pressure module. Therefore, if we want to increase the thermal efficiency of the circulation, by increasing the temperature of the steam-gas mixture at the inlet to the high-pressure part (HP) of the turbine, the temperature at its outlet will increase proportionally.

SUMMARY OF THE INVENTION

The above-mentioned problems are partially solved by a steam-gas cycle with a steam generator and a heat transformer, which is based on the fact that the outlet nozzle of the high-pressure turbine is connected to the primary side of the steam generator and the heat transformer. and a high pressure steam pipe to a high pressure steam module.

In the case of a high temperature of the steam-gas mixture at the outlet of the turbine, at least one additional steam generator may be installed upstream of the heat transformer. The steam-gas mixture is cooled on the primary side and superheated high-pressure steam is generated on the secondary side, which is fed to the turbine. It works at a different pressure and temperature steam level than the original steam generator and transformer. It is included between the original steam generator and the heat transformer input.

The pressure and temperature of the steam generated corresponds to the pressure and temperature of the steam-gas mixture and decreases downstream. The temperature and pressure of the steam at the outlet of the heat transformer and the individual heat generators is selected so that the energy contained in the steam-gas mixture at the outlet of the turbine can be used as efficiently as possible. The steam produced from the steam generators and the heat transformer is fed to the multi-pressure steam part of the steam-gas turbine. Here it expands to the pressure in the condenser where it condenses. Condensate is discharged from the condenser back to the cycle using the condensate pump.

The aforesaid steam generators and heat transformer may be arranged in a single body in which steam at different pressures is produced.

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Overview of pictures

The attached figure shows a simplified thermal circuit diagram with a steam-gas turbine with a steam generator and a heat transformer.

Exemplary embodiment

The attached figure shows a thermal cycle diagram of a steam-gas turbine with a single-stage steam generator and a heat transformer consisting of a PPS 7 generator connected by a steam-gas mixture line 16 to a steam-gas turbine 1 whose outlet connection is connected to the steam generator 5 and heat transformer. 6, which is connected by a water line to a feed pump 11 and a steam-gas mixture generator 7, the steam generator 5 being connected to a high pressure steam line 18 with a high pressure steam module 2 and a heat transformer 6 connected by a medium pressure steam line to a low pressure module 3 The condenser 8 is connected via a condensate pump 9 with a heat transformer 6 and via a booster pump 10 with a steam generator 5. Fuel line 12 supplies fuel to the steam-gas mixture generator 7, oxygen line 13, oxygen. Carbon dioxide is discharged from the heat transformer 6 through carbon dioxide line 14, excess water through line 15 of discharged water. The single-stage steam generator 5 may be replaced by a multi-stage steam generator that produces a multi-pressure steam that is introduced into the multi-stage steam turbine.

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PATENT CLAIMS

Claims (3)

PATENT CLAIMS 1) A steam-gas cycle with a steam generator and a heat transformer characterized in that the outlet nozzle of the high-pressure turbine (1) is connected via the steam-gas mixture pipe (16) to the primary side of the steam generator (5) and further to the heat transformer (6). the steam generator (5) is connected to the booster pump (10) and the high pressure steam line (18) to the high pressure steam module (2). 2) A steam-gas cycle with a steam generator and a heat transformer according to claim 1, characterized in that at least one further steam generator is arranged between the steam generator (5) and the high-pressure module (1). 3) A steam-gas cycle with a steam generator and a heat transformer according to claim 1, characterized in that the at least one steam generator is arranged together with the steam transformer in one body. Ar ar ar ar ar ar ar ar ar ar ar ar ar ar ar ar ar ar ar ar ar ^ ^ ar ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ The secondary side of the steam generator (10) is connected to the booster pump (10) and the high-pressure steam line (18) to the high-pressure steam module (2). At least one additional Steam generator is arranged between the Gift Generator (5) and the High Pressure Module (1). 'Dl At least one steam generator with a steam transformer T can be co-located in one body.