Gas-turbine generator

FIELD: device adapted to reduce pressure in main gas pipeline, particularly for excessive gas energy utilization.

SUBSTANCE: used as electric machine is multipolar induction motor operating in generator mode and performing recovery of energy into supply main. Turbine, electric machine and velocity pickup are arranged in sealed chamber including bushing insulators connected with electric machine and velocity pickup from one side and with supply main through commutator from another side.

EFFECT: increased reliability and energy data.

2 dwg

 

The invention relates to a device for lowering the pressure in the main gas pipelines and can be used for the disposal of surplus energy of the gas.

Known technical solution (see log IR No. 1, 1984, IL No. 11, 1985, p.12-13), which is to be used instead of the pressure reducing valve of a gas turbine - getendure coupled to an electric generator. It is also possible to produce electrical energy due to the pressure drop in the pipeline.

The complexity of solving the problem is to seal machines and the speed regulation of the turbine to obtain a stable frequency current. Question sealing machines partially solved in azotobacteraceae in A.S. No. 422924, F 25 11/00 from 1974 Known AttorneyGeneral contains the expansion and the electric machine, the shafts of which are connected by the clutch, which is located in the hermetic shell connecting the chassis machines. The disadvantages of the known device lies in the fact that it is necessary to perform an airtight both machines, and it's hard. On the other hand, the complexity of the regulation of the frequency of the oscillator at its industrial chain.

The closest technical solution is the invention (see patent RU 2151971, MCP F 25 11/00 from 30.10.00), taken by the authors for the prototype.

Known AttorneyGeneral, mainly for recycling and bitchney energy of the gas, containing expansion (e.g., turbine) and an electric machine, the shafts of which are connected by the coupling, and as the electric machine used asynchronous machine in generator mode with energy recovery in the supply chain, with the turbine and the electric machine are located in a sealed chamber containing bushings connected to one side of the electric machine, and on the other hand with the supply chain.

A disadvantage of the known technical solutions are low energy indicators in a large range of speed change of the turbine. This follows from the formulas losses in asynchronous motor:

ΔPl=M(ω0-ω)=Mω0s,

where ΔPl- the electrical losses in the rotor, W;

M torque N·m;

ω0=2πf/R - speed rotation of the magnetic field, s-1;

f is the mains frequency, Hz;

p - number of pole pairs, p=1, 2, 3...n;

ω - speed rotation of the rotor of an induction motor, s-1;

s - slip, O.E.

Thus, at high nominal speed ω0and large variations in rotor speed ω (i.e. large sliding s) will be and large energy losses in the rotor of the electric machine.

The technical solution of the task is to increase reliability and energy performance.

This object is achieved in that AttorneyGeneral, mainly for the disposal of surplus energy gas contains the expansion chamber, for example a turbine, and an asynchronous machine in generator mode with energy recovery in the supply chain, located in the hermetic chamber with bushing insulators connected to one side with an asynchronous machine, and on the other with the supply chain, further comprises a switch and a speed sensor located in the hermetic chamber, winding induction machines connected to the network, and the speed sensor - switch feedthrough insulators, while the asynchronous machine is made of a multipolar.

The novelty of the claimed technical solution is due to the use of multi-pole asynchronous machine operating in a regenerative braking with energy efficiency in the supply chain, added switch and speed sensor located in a sealed chamber, with winding induction machines connected to the network, and the speed sensor - switch feedthrough insulators.

According to scientific-technical and patent literature authors unknown to the claimed combination of features, aimed at the achievement of the task, and this decision does not follow clearly from the prior art that provides in order to make a conclusion on the conformity of the decision level of the invention. The proposed solution is industrially applicable.

The principle of operation of azotobacteraceae illustrated by drawings, where figure 1 shows the design of the device, and figure 2 - electrical connection diagram.

The hermetic chamber 1 has an input 2 and output 3 nozzles. The expansion machine (turbine) 4 with the output shaft 5 through the clutch 6 is connected with the shaft 7 multi-pole asynchronous motor (induction machines) 8, which by means of racks 9 is attached to the casing of a sealed chamber 1. Bushing insulator 10 on the one hand is connected with the windings multi-pole asynchronous motor 8, a speed sensor 11, on the other hand - with the switch 12 and the network 13 (a, b, C) figure 2.

AttorneyGeneral works as follows. The high-pressure gas enters the inlet pipe 2 of a sealed chamber 1 passes through the turbine 4, creating torque and reducing the pressure. Low-pressure gas passes into the space between the casing of a sealed chamber 1 and the housing multi-pole asynchronous motor 8, is supplied to the output sockets 3 and later in the pipeline.

For example, in the initial moment of time the switch 12 is in the position shown in figure 2, i.e. the three lower contact is closed and the top open. In this position, the winding of the multi-pole asynchronous motor 8 is included at the bottom of the second rotation speed, for example 1500 rpm-1(p=2). By increasing the speed of rotation of the turbine 4 and the multi-pole asynchronous motor 8 is higher than the rotation speed of the magnetic field (n1>n01) multi-pole asynchronous motor goes into a mode of regenerative braking capacity of active power in the network: a, b, C.

When increasing the gas flow rate increases the speed of rotation of the turbine, grow the active losses in the rotor pole asynchronous motor.

Upon reaching the speed of rotation n2>n02for example 3100 min-1the speed sensor 11 sends a signal, and the switch 12 switches. Upper circuit contacts are closed (figure 2), and the bottom is open. Winding multi-pole asynchronous motor 8 is switched to a different number of pole pairs (p=1). The speed of rotation of the magnetic field becomes 3000 min-1the slip decreases, reduces losses in the rotor, the active power is given to the network with a high energy performance.

As a multi-pole asynchronous motor can be used in two-, three-, four-speed asynchronous machine. The more poles the asynchronous machine, the higher the efficiency of azotobacteraceae. Moreover, the mechanical characteristics of the motors may be different, depending on the mechanical characteristics of the turbine (at constant torque, constant is authorized capacity, fan etc).

The proposed AttorneyGeneral has the following advantages:

1. You can make AttorneyGeneral on a large power range.

2. Has simple structure, high reliability and efficiency through multi-pole asynchronous motor.

3. Multi-pole asynchronous motor with squirrel-cage rotor gives the network active power at a constant frequency current in a wide range of speed change, for example 750/1000/1500/3000 min-1that gives the opportunity to coordinate this turbo-generator with the mains supply.

4. The gas discharged from the turbine, cools the electric machine, which also increases the efficiency of the system.

AttorneyGeneral, mainly for the disposal of surplus energy gas containing located in the hermetic chamber turbine and asynchronous machine in generator mode with energy recovery in the supply chain and bushings connected to the windings of the asynchronous machine, characterized in that it contains a switch and a speed sensor located in the airtight chamber, the asynchronous machine is made of a multipolar, bushings connected to the windings of the asynchronous machine is connected through the contacts of the switch from the mains supply, and the speed sensor is connected to the switch through the bushings.



 

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