Gas turbine plant for conversion of associated petroleum gas into power

FIELD: power engineering.

SUBSTANCE: gas turbine plant for conversion of associated petroleum gas into power comprises an air compressor, a turbine, a combustion chamber, a power generator and a device o air heating downstream the compressor, comprising a heat exchange regenerator device arranged in an exhaust pipe. The combustion chamber with the exhaust pipe are arranged in the form of a surface flare for burning of associated petroleum gas. The compressor is equipped with an electric drive. The turbine at the outlet side is communicated with environment with the help of an autonomous pipe. The surface flare at the side of associated petroleum gas supply is made with a device of atmospheric air intake.

EFFECT: expanded area of gas turbine plant application, increased efficiency of carbon fuel usage and improved environmental capability of environment.

2 cl, 2 dwg

 

The invention relates to the field of energy and can be used in the oil industry in fields which are constant emission of associated petroleum gas (APG).

The closest in technical essence of the present invention are located in the operations of OAO "Gazprom" gas turbine unit (GTU) 6 MW type GT-750-6 and 10 MW SCC-10-4 (Aiyyo and other "Performance monitoring of the technical condition and safe operation of turbine GTK-10-4 and GT-750-6", J. the Territory of Ukraine, №2, 2009), made with regenerative cycle (see GOST R 51852-20001. Installation of the gas turbine. Terms and definitions (ISO 3977-1)containing air compressor, turbine, combustion chamber, heat of the air downstream of the compressor, which includes a heat exchanger-regenerator mounted in the exhaust pipe, a blower for gas pumping units (GPU) or a generator for electricity generation (prototype). The essence of the regenerative cycle is that the air coming into the combustion chamber after the compressor is pre-heated in heat exchange apparatus, the regenerator is installed in the exhaust pipe, due to the heat released gases after the turbine, and the required temperature before the turbine is provided by the combustion the gas in the combustion chamber.

The lack of a gas turbine from a purely regenerative cycle is that it is not possible to use APG without special training (without gas cleaning and pressure increase).

The technical purpose of this invention is to extend the scope of application of the gas turbine regenerative cycle in the interests of fuel and energy complex, as well as increasing the efficiency of hydrocarbon fuels and improve the environment by reducing harmful emissions of nitrogen oxides NOx and carbon oxides FROM combustion of APG.

This object is achieved in that in the proposed GTP containing air compressor, turbine, combustion chamber, a generator and the device heated air downstream of the compressor, which includes a heat exchanger-regenerator located in the exhaust pipe, according to the invention the combustion chamber with the exhaust pipe is made in the form of a ground flare associated gas aring. The compressor is equipped with electric, turbine output side communicated with the environment using Autonomous pipe, and ground flare unit from the supply of associated gas is made with the device of the intake of atmospheric air.

Combined layout of the exhaust pipe and the combustion chamber is performing them in the ground flare associated gas aring with design, providing appropriate requirements set forth in technical documentation, allows

to ensure safety, enhance the economy of the process and the ecology of the environment;

- to carry out the heating of the working fluid of the turbine in heat exchange apparatus to the desired temperature, which provides a high uniformity of the temperature field of the working fluid (air cleaner) before the nozzle device of the turbine;

- to organize the combustion process associated petroleum gas low pressure (less than 0.1 MPa) and without special training that simplifies the technology reduces the complexity and produces lower emissions.

The connection cavity after the turbine with the environment through the cavity ground flare systems, including increases power characteristics STU, as the ground flares are made with injection properties of the flow path, which provides a higher degree of expansion of the working fluid to the turbine, and hence, greater its power.

Running the compressor with another drive, that drive, and the connection cavity after the turbine with the environment of the individual pipe is relevant for energy of several tens of kW and at low degrees of compression of the compressor (2). This solution significant is but simplifies the design of the installation, but will be a limitation on the maximum amount of power as the turbine generator must develop in the generator even the power required to drive the compressor motor.

The proposed gas turbine installation shown schematically in the drawings figures 1 and 2.

Figure 1 shows a gas turbine installation according to the proposed technical solution.

Figure 2 schematically shows a part of the installation for option compressor with electric drive.

Gas turbine plant comprises an air compressor 1, a turbine 2, the generator 3 and the device 4 for heating the air after the compressor (see figure 1). In turn, the device 4 includes a heat exchanger-regenerator 5, which is installed in the exhaust pipe 6 and the combustion chamber 7 with the pipe 6 in the form of a ground flare gas flaring. A compressor connected to the turbine 2 (see figure 1) or to the electric motor 8 (see figure 2). The generator in both cases connected to the turbine 2. The output cavity after the compressor 1 is in communication with the heat exchanger-regenerator 5 through pipe 9, and the output of the heat exchanger communicates with the cavity of the turbine 2 through the pipeline 10. The cavity after the turbine 2 communicates with the cavity ground flare systems using Tr is aprovada 11 or with the environment through Autonomous pipe 12 (see 2). In the latter case, the ground flare unit is made with a device 13 of the intake of atmospheric air.

Gas turbine unit works as follows.

Using pneumatic or electric starter (not shown in figure 1), and for the variant shown in figure 2, by an electric motor 8 is promotion of the compressor. Air after the compressor enters the heat exchanger-regenerator 5 and the turbine 2 which drives a generator. At a certain value of the pressure after the compressor is fed oil-dissolved gas ground flare unit, where organized burned. The resulting heat warms in the heat exchange apparatus of the air with the desired temperature is supplied to the turbine to increase its power. When the amount of power the turbine exceeding the power consumption of the compressor, pre-promotion of the rotor is stopped and the gas turbine enters the mode that provides the necessary frequency and voltage of the generator. The produced energy is consumed for own needs of the field and sent to different consumers.

Estimates using actual volumes of constant emissions APG in various fields and source data GTU type GT-750-6 (6 MW) and GTK-10-4 (capacity of 10 MW the show what's with these GTU and proposed technical solutions can be converted into electricity, a small fraction of the total discharge of associated gas at the fields, but at the same time save the consumption of natural gas from 20 to 30 million nm3/year, which from the point of view of economic efficiency is very important. On the other hand, nothing prevents the implementation of this project is to apply more powerful GTU or make upgrades more on the same field.

The proposed device for processing of associated petroleum gas into electricity allows to simplify the technology, how the burning of associated gas at low pressure (after the last stage of separation) and without special purification. Moreover, the combustion of APG in the ground flare installation with active air flow helps to improve the combustion process, and hence to reduce the harmful emissions of NOx and CO.

1. Gas turbine installation for processing of associated petroleum gas into electricity, which contains an air compressor, a turbine, a combustion chamber, a generator and the device heated air downstream of the compressor, which includes a heat exchanger-regenerator located in the exhaust pipe, characterized in that the combustion chamber with the exhaust pipe is made in the form of ground f the compulsory installation of associated petroleum gas.

2. Gas turbine installation according to claim 1, characterized in that the compressor is equipped with electric, turbine output side communicated with the environment using Autonomous pipe, and ground flare unit from the supply of associated gas is made with the device of the intake of atmospheric air.



 

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