The method of operation of gas-steam installation

 

(57) Abstract:

The method of operation of gas-steam installer includes compressing the gaseous working medium air, heating the compressed working fluid fuel combustion, expansion of a heated working fluid, the utilization of residual heat expanded working fluid by generating steam, supply supplied into the gas path before combustion, condensation of steam at the exhaust and removing the water from the combustion products. The working process is carried out in at least two gas paths, separate or partially combined, with separate exhausts. The steam generated in the exhaust stream of the same gas path, and let all the steam or the greatest part of it to another gas tract, in which a ratio of components with a high content of water vapor. The flow rate of water vapor exceeds the air flow. In this tract produce heating and expansion of the gas with subsequent condensation of the steam. The invention increases the effective efficiency of the installation. 9 Il.

The invention relates to power engineering, and in particular to methods of operation and design of power gas turbine (GT) and combined units (GPU).

what a body burning fuel, expanding the heated working fluid, utilization of residual heat expanded working fluid by generating steam and supplying the obtained vapor in the gas path before combustion (see , for example, Batenin C. M. and others "combined-cycle power plant with injection of steam into the gas turbine is a promising direction of development of power plants", "thermal engineering", 1993, N 10, PP 46-52).

There is also known a method of operation of the gas turbine, in which the workflow is carried out in two gas paths, separate or partially combined with diverse temperature exhaust streams displayed in the total recycling system which generates water vapor supplied to one of the gas ducts before combustion (see RF application No. 93 009679/06/008853).

The disadvantage of this method of GTPP is a great irretrievable demineralized water 5-7 times greater than the fuel consumption. Since the water flow in the known gas turbine plants with a supply of steam flowing in the part does not exceed 15-20%, removing it from the combustion products by condensation in the exhaust is very difficult, since the pressure on the exhaust, slightly higher than atmospheric (by the amount of hydraulic losses in the exhaust tra is to place 60-70oC. At the same time, we know that in utilizing the systems of gas turbines and steam boilers allow reduction of the flue gas temperature to a value of not less than 100oC, because at lower temperatures there is an intensive contamination of the heat transfer surfaces.

The aim of the invention is the extraction of water from the combustion products while ensuring a high thermodynamic efficiency Gasparovic plant with a supply of steam in the gas passage.

This goal is achieved by the fact that the worker process is carried out in at least two gas paths, separate or partially combined, with separate exhausts, and all the steam generated by utilizing the residual heat of the expanded working fluid, or the greatest part thereof is supplied to one of the gas ducts, in which the ratio of the components with a high content of water vapor, and this tract is the condensation of water vapor.

As the results of the analysis when using this offer, the condensing temperature of steam can be raised to 100oC and above, while maintaining the high thermodynamic efficiency of the power plant and provided a high degree ashod air three times, and the backpressure on the exhaust 1.2 kg/cm2abs. the partial vapor pressure compared to atmospheric and the condensing temperature is 100oC. in Addition, improved terms of useful use of the heat released during condensation at a higher temperature, for example, for heating or for generating steam in a combined steam power installation of low pressure.

Analysis of the known technical solutions in the area of study allows to draw a conclusion about the absence of these symptoms that are similar to salient features in the claimed proposal that demonstrates its compliance with the criterion of "substantial differences".

Schema GPU that implements the specified method of operation shown in Fig. 1-9.

Look at the diagram of the GPU, shown in Fig. 1. The GPU consists of two kinematically independent motors, each of which includes a compressor 1 and 9, the combustion chamber 2, 4 and 10, a turbine 3, 5 and 11, the power consumers 6 and 12, the steam generators are utilizing the residual heat of the exhaust gases 7 and 8 provided on the exit of steam from the gas path of one of the engines before the combustion chamber 10, and placed on the exhaust of the engine to the condenser 13.

oC.

The efficiency of a power plant is higher, the higher the temperature of the steam supplied to the system, so it might be appropriate for more overheated steam generated in the exhaust stream of lower temperature, high temperature exhaust stream, Suha and the relatively low temperature of the gas, limited to the limiting magnitude of the heat supply in the camera 10, it may be advisable to steam generation only in the first exhaust gas stream, as shown in Fig. 3.

GPTU may have partially merged air tract, as shown in Fig. 4. The division into two tract, there is produced after compression of the air in the compressor, so that the combined-cycle path with a relatively lower temperature of the gas transfers all power to the consumer. Thus obtained in the condenser 13 water through the system and discharge cleanup 14 can be returned to the gas path.

When the condensing temperature of about 100oC becomes thermodynamically feasible to combine with the condensation process the process of generating a pair of lower pressure in the condenser steam generator 15 combined closed steam circuit (see Fig. 5) steam low-pressure turbine 16, resulting in a consumer capacity of 17, and its vacuum capacitor 18 with the usual steam power plants with condensing pressure of 0.03-0.05 kg/cm2abs. and its supply system 19. Obtained in this circuit, the additional capacity will significantly increase the effective efficiency of a power plant. However, gasturbine what nicom-cooler 21.

The separation of the air streams may be performed after partial compression of air for low-pressure compressor 9, as shown in Fig. 6, a combined-cycle path will turn your high-pressure compressor 9.

Steam turbine low-temperature steam circuit can be driven upstream of the low-pressure compressor 22 with heat exchanger-cooler 23, as shown in Fig. 7. The performance of the GPU can significantly expand the range of power control while maintaining the high performance of the GPU.

In some cases it may be necessary to raise the temperature of condensation of the vapor to 100-110oC to increase the condensing pressure up to 1.5-2 kg/cm2. In addition, a further extension remaining after condensation of the gas is placed behind the turbine condenser is impossible for the above reasons - contamination of the heat transfer surfaces. In this case, it is advisable to use the energy of this flow for ejection of the other exhaust gas flow in the ejector 24, thereby increasing the degree of expansion and useful turbine gas path, as shown in Fig. 8.

Implementation of the proposed technical solutions will improve e the output power at a substantially higher power density, lower unit costs and lower consumption of cooling water to condense steam. In addition, due to the substantially larger than in the binary gas installations, specific heat per kilogram of air increases the overall utilization rate of heat when working with heat for district heating.

The method of operation of a gas installation, including compressed gaseous working medium air, heating the compressed working fluid fuel combustion, expansion of a heated working fluid, the utilization of residual heat expanded working fluid by generating steam, supply supplied into the gas path before combustion, condensation of steam at the exhaust and removing the water from the combustion products, and the working process is carried out in at least two gas paths, separate or partially combined, with separate exhausts, characterized in that the steam generated in the exhaust stream only one gas path, and let all the steam or the greatest part of it to another gas tract, in which a ratio of components with a high content of water vapor, the flow rate which exceeds the flow of air, and in this tract produce heating and R is

 

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SUBSTANCE: invention can be used in contact-type steam-gas plants containing gas-turbine plants with injection of steam. Proposed contact-type steam-gas plant contains gas-turbine plant with compressor, combustion chamber and main gas turbine, recovery boiler with two-pressure steam circuits communicating at steam outlets by steam pipelines and with inlets of gas-turbine plant by high-pressure and low-pressure steam lines, respectively, and at inlet of heating carrier (gas), with gas outlet of gas-turbine plant. Contact-type steam-gas plant contains also gas cooler-condenser connected by condensate outlet through pumps and with condensate inlet of recovery boiler. To reduced gas pressure at exhaust of gas turbine, contact-type steam-gas plant is furnished with topping-up compressor communicating by compressed gas inlet with gas outlet of gas cooler-condenser, by gas outlet with surrounding medium, and overexpansion gas turbine communicating by gas inlet with gas outlet of recovery boiler and by gas outlet, with gas inlet of gas-cooler-condenser. Rotor of overexpansion gas turbine is coupled (for instance, is installed) on one shaft with rotors of gas-turbine plant and/or topping-up compressor.

EFFECT: increased efficiency of contact-type steam-gas plant owing to reduction of gas turbine exhaust gas pressure without consumption of useful power of plant.

1 dwg

FIELD: pipeline transport.

SUBSTANCE: power plant is additionally provided with a turbine expander provided with an electric generator. Power generated by the steam plant is directed to the main gas pipeline, and a part of power is directed to the turbine expander with electric generator to produce electric power.

EFFECT: enhanced reliability and efficiency.

1 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: system has boiler, steam turbine, electric generator, deaerator, feeding pump, and is additionally provided with gas-steam turbine plant block having low-pressure combustion chamber, steam-gas mixture heat utilization block and separated water utilization block. Steam-gas mixture heat utilization block has utilization boiler with high-pressure steam generator and additional low-pressure steam generator. Block for using separated water via low-pressure nutritious water pipeline is connected to low-pressure steam generator of utilization boiler and via irrigation water pipeline is connected to irrigation device of steam-gas mixture heat utilization block. Input of high-pressure steam generator of utilization boiler is connected by steam-gas mixture pipeline to output of steam-gas turbine plant. Low-pressure steam generator of utilization boiler is connected via low-pressure steam generator to additional combustion chamber of steam-gas turbine plant. Block for using separated water via pipelines for low-pressure nutritious water, irrigation water and separated water is connected to block for utilization of steam-gas mixture heat and via pipelines for cooled down and heated network water - to base main line. High-pressure steam generator is connected via high-pressure nutritious water pipeline and high-pressure steam pipeline to base main line.

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FIELD: power engineering.

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FIELD: power and heat generation.

SUBSTANCE: proposed power and heating plant with open power and heat supply system including boiler unit, steam turbine, deaerator and feed pump includes steam-gas turbine plant unit with low-pressure afterburning chamber, steam gas mixture heat recovery unit containing recovery boiler with high-and-pressure steam generators, spraying device, gas cooler-condenser and separated water utilization unit. Separated water utilization unit is connected with input of low-pressure steam generator of recovery boiler through water softening set and deaerator. Spraying device is connected with raw water softening device of power and heating plant. Input of high-pressure steam generator of recovery boiler is connected with output of steam-gas-turbine plant. Low-pressure steam generator of recovery boiler is connected with additional afterburning chamber of steam-gas turbine plant. Separated water utilization unit is connected by pipeline of softened and deaerated low-pressure feed water with steam-gas mixture heat recovery unit and pipeline of softened, heated and deaerated make-up water with open power and heat supply system. High-pressure steam generator is connected by feed water and steam pipelines with power and heating plant.

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2 dwg

FIELD: heat supply systems.

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EFFECT: prevention of gas flows into steam ducts and getting of gas and steam into room with final-stage set.

1 dwg

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