Gas turbine system running on steel work gas

FIELD: machine building.

SUBSTANCE: proposed system comprises air compressor, steel work gas compressor, combustion chamber, turbine, transmission for coupling drive shaft with steel work gas compressor. Turbine is driven by combustion chamber waste gas to transmit mechanical power to air compressor and using equipment, in particular, to AC generator and drive shaft. Compressed air and steel work compressed gas and/or natural gas are fed into combustion chamber. Transmission comprises means of coupling/uncoupling steel work gas compressor with/from drive shaft during rotation of the latter.

EFFECT: increased electric power output, decreased idle time, higher efficiency at restart of turbine and AC generator.

9 cl, 2 dwg

 

The AREA of TECHNICAL APPLICATIONS

The present invention relates to a gas turbine system, in which in use as a fuel gas steel plant, i.e. a mixture of gases generated in steel plants in the production of steel. The present invention, in particular, can be applied to power plants with combined and single cycle.

The LEVEL of TECHNOLOGY

As you know, steel plants contain blast furnace (creating a so-called BFG, that is, "blast furnace gas"), electric converters (creating a so-called BOFG, i.e. "gas oxygen Converter"), and coke ovens (creating a so-called "gas coke oven"), which produced the so-called "carbon coke required in the production of steel.

Gas steel plant is formed at a pressure slightly above atmospheric pressure. However, because the combustion chamber of gas turbine systems require fuel gas was under higher pressure, gas steel plant should be compressed using a compressor, which absorbs a significant portion (typically 15-30%) output power of the system.

In addition, gas steel plant has a relatively low heat of combustion compared to the so-called natural gas, and therefore it is usual to burn in large quantities.

In order to avoid stoppages in the production of electric energy during those periods when gas steel plant is missing, the system should work by means of a flow in the combustion of natural gas as fuel.

In the known solutions for improving efficiency and reducing the overall dimensions of the system compressor gas steel plant installed on the same drive shaft as the gas turbine. As a result, the compressor runs continuously, even when system startup, at its idling or when submitting to it as a fuel, natural gas, resulting in energy consumption, not creation of electric energy and, therefore, to unproductive expenditures.

In the known solutions of the above type, the only way to avoid such acquisitions mechanical energy, is to disconnect the flange rigidly connecting the compressor for gas steel plant to the drive shaft of the turbine. This operation requires a considerable investment of time and stop system for cooling its components, disconnecting the compressor and re-start the system. Obviously, when the system is stopped, the electric energy is not produced, that should be avoided at all costs.

DESCRIPTION OF THE INVENTION

The purpose of the present invention is to provide a gas turbine system, in which in use as a fuel gas steel plant, and which provides an immediate solution to the above problems with low cost.

According to the present invention results from the gas turbine system in which the use as a fuel gas to the steel making plant, the system contains:

at least the compressor of the air required for combustion;

at least the gas compressor steel plant;

the combustion chamber that receives the compressed combustion air and compressed gas steel plant;

a turbine driven by exhaust gas emerging from the combustion chamber to apply mechanical energy to the compressor for the air required for combustion, to the user's machine, in particular to the alternator and to the drive shaft;

transmission device for connecting with each other of the drive shaft and the compressor for the gas steelworks;

characterized in that the transfer means include means to connect/disconnect to disconnect the compressor gas steel plant from the drive shaft when the drive shaft rotates.

The means of connection/disconnection predpochtite the flax contain the torque Converter.

BRIEF DESCRIPTION of FIGURES

Do not impose restrictions variant embodiment of the invention will be described in the form of an example with reference to the accompanying figures, in which:

The figure 1 presents the scheme of the preferred alternative implementation of the gas turbine system according to the present invention, in which in use as a fuel gas to the steel making plant;

In the figure 2 on an enlarged scale, partly in section, presents a schematic view in perspective of a fragment of the system according to figure 1.

The BEST WAY of carrying out the INVENTION

In the figure 1 position 1 shows a gas turbine system (schematically shown), forming part of the electric power installation 2 (shown partially) combined cycle to which the fuel can be enjoyed natural gas and/or gas steel plant.

More precisely, it should be considered that the term "gas steelmaking plant" means a mixture of gases generated in steel plants 3 when manufacturing began, called, for example, BFG ("blast gas"), when set in a blast furnace, BOFG ("gas oxygen Converter")when it is created by electrical converters, or COG (coke oven gas), when it is created in the coke ovens, which produce so-called "carbon coke", required is for the manufacture of steel.

When the achievement system 1 gas steel plant served to the compressor 6, containing step 7 low pressure, defined by the axial compressor, and stage 8 high pressure, defined by a radial compressor, which are coaxial with each other and are driven by rotation of the shaft 9.

Gas steel plant, compressed by the compressor 6, and natural gas are mixed with each other inside the adjusting device 11, which regulates the flow of fuel gas to the combustion chamber 14 through supply line 15 between the device 11 and the camera 14.

The air required for combustion flows through the supply line 18 from the compressor 17 into the chamber 14.

The system 1 also includes a turbine 20, which receives the exhaust gas discharged from the chamber 14, and generates mechanical energy to actuate the compressor 17, 6 and AC generator 22 to generate electrical energy.

More precisely, the alternator 22 and the drive shaft 21 driven by the turbine 20, are located along the same axis as the compressor 17 and the turbine 20.

The shaft 21 parallel to the shaft 9 and connected with the shaft 9 through the transmission 25, containing the accelerating gear 26 for transmitting motion to the shaft 9 and the speed of its rotation.

Transmission 25 also includes connecting/disconnecting device is in 27, which is set in the axial direction between the shaft 21 and the input shaft 28 of the accelerating gear 26 (figure 2), and which can be actuated to disconnect the shaft 9, when the shaft 21 rotates, i.e. it is in action.

As shown in figure 2, the device 27 includes a mechanical coupling element 29, which may be actuated to connect the shafts 21 and 28 with the direct transmission and the torque Converter 30, which, when the connection shaft speeds up the shaft 28 to the speed of the shaft 21 before actuation element 29.

In the example shown, the torque Converter 30 is a known device, for example, of this type, which is known under the trade name "Vosycon" (registered trademark), and it contains the element 29 and contains two facing each other in the axial direction of the housing parts 31, 32 attached in fixed positions to the ends of the shafts 21 and 28 respectively. The torque Converter 30 also includes a pump wheel 33, held Cabinet part 31 to compress the working fluid radially outward, and the blades 34 of the radial turbine, held Cabinet part 32 for receiving the working fluid from the pump wheel 33 to rotate the shaft 28.

The element 29 is made in the form of a disk, hard and at an angle attached to the shaft 28, and/interposes part 32. The disk 29 slides in the axial direction between a forward position in which it is fixed at an angle relative to the hull 31 by means of the teeth 35, and the designated position, in which it is disconnected from the hull 31 and, therefore, from the shaft 21. The disk 29 comes in a forward position under the influence of hydraulic pressure in line 36, one end of which is formed directly inside the hull 32 and which extends inside the chamber 37 formed by the disk and Cabinet part 32, and opposite to the force of elasticity of the device 38 formed near the Belleville washers and inserted in the axial direction between the disk 29 and the axial end of the shaft 28.

As schematically shown in the attached figures, the system 1 also contains the so-called safety connection 40 (figure 1), is inserted in the axial direction between the device 27 and the alternator 22 and the retaining device 41 (shown schematically in figure 2), which give effect to stop the shaft 9, when the shaft 28 is disconnected from the shaft 21, and thus to ensure the safe maintenance of the compressor 6.

In the practical use of the compressor 6 is disconnected from the turbine 20 as follows:

the device 11 is adjusted to perform switching to supply gas stalprofil the second plant for the supply of natural gas;

the discharge from the compressor 6 is realized by means of the recirculation piping and exhaust valves (not shown);

the torque Converter 30 run through the supply of fluid to the pump wheel 33 and, thus, fill the torque Converter 30;

the element 29 is disconnected from the hull 31 by reducing the pressure inside the chamber 37, and at the same time, the shafts 28 and 21 by means of the torque Converter 30 is maintained at the same speed (synchronized);

the torque Converter 30 is hydraulically adjust to reduce the speed of shaft 28 until the shaft stops;

the torque Converter 30 is disconnected (transferred to idle) by draining the entire working fluid;

the device 41 operate to lock the shafts 28 and 9.

Once completed the above operations that can be performed automatically, the system 1 will operate on natural gas without actuation of the compressor 6.

The device 27 is also used to connect the compressor 6 by performing the opposite operations in the reverse order with respect to the above-described procedure detach.

Obviously, when using the device 27 to disconnect the compressor 6 from the turbine 20 to the AC generator 22 serves more mechanical the massive energy and therefore, create more electrical power in comparison with the known solutions, in which case the compressor 6 necessarily remains connected with the shaft 21.

At relatively small additional cost to the device 27 (gross assessment of components 0,4%) absorption of mechanical energy will be reduced, resulting in increase of electric energy production of about 5-13%.

In addition, downtime installation 2 will be reduced in comparison with the known solutions due to the fact that it is no longer necessary to stop the operation of the unit 2, to disconnect the compressor 6, which can be disconnected when operating the turbine 20.

Another advantage is to improve efficiency at restart of the turbine 20 and the alternator 22 due to the reduction of energy consumption due to the exclusion of rotation of the compressor 6.

In addition, when connecting the compressor 6, the shaft 28 will be gradually accelerated to the same speed as the shaft 21, by means of the torque Converter 30, thus preventing the locking of the accelerating gear 26.

Obviously, the described system 1 can be modified without leaving the scope of the invention.

In particular, it is possible to exclude the accelerating gear 26, or it may differ from the accelerating gear, to ora described as an example, and/or device 27, and/or 41 can be attached directly to the shaft 9, and/or direct transmission between the shafts 21 and 28 may represent or otherwise located otherwise the device than the device described as an example, and/or the compressor 17 and the turbine 20 may also have a number of steps and/or system 1 may be used to actuate the machine user, which is different from the AC generator 22, such as a pump or other compressor or electrical power installations with one cycle.

1. Gas turbine system (1)using gas steel plant as fuel, the system includes: at least a compressor (17) of air required for combustion; at least a compressor (6) gas steel plant; a combustion chamber (14)that receives the compressed combustion air and compressed gas steel plant and/or natural gas; turbine (20)driven by exhaust gas of the combustion chamber (14), to supply mechanical power to the compressor (17) of the combustion air, to the user's machine, in particular to the alternator (22), and to the drive shaft (21), the transmission (25) for connecting the drive shaft (21) and the compressor (6) for gas steel plant with each other; characterized in that the transmission (25) contents the t means (27) connection/disconnection to disconnect the compressor (6) for gas steel plant from the drive shaft (21), while the drive shaft (21) is in rotation.

2. The system according to claim 1, characterized in that the means (27) connects/disconnects contain mechanical connecting means (29)which can be actuated to connect the drive shaft (21) with direct transfer to the secondary drive shaft (28), operate the compressor (6) for gas steel plant, and synchronizing means (30) for synchronization of the additional speed of the drive shaft (28) with the speed of the drive shaft (21) before actuation of the mechanical connecting means (29).

3. The system according to claim 2, characterized in that the synchronizing means (30) are hydraulic means.

4. The system according to claim 3, characterized in that the means (27) connects/disconnects contain the torque Converter (30).

5. System according to any one of claims 1 to 4, characterized in that it contains a locking means (41) to stop the rotation of the input shaft (9) of the compressor (6) for gas steel plant, when the compressor (6) for gas steel plant is disconnected from the drive shaft (21).

6. System according to any one of claims 1 to 4, characterized in that the transmission device (25) includes accelerating gear (26).

7. System according to any one of claims 1 to 4, characterized in that it comprises a generator (22) electrical energy and, driven by a turbine (20).

8. The system according to claim 7, characterized in that it forms part of a power plant with combined cycle.

9. The system according to claim 7, characterized in that it forms part of a power plant with one cycle.



 

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