The control system expander

 

(57) Abstract:

The system is designed to regulate turboexpanders. In this control system turboexpander the stop valve is made in the form of two valves, mutually exclusive permeable to gas in the separate discharge line. Bypass line to the turbo-expander has a regulatory body with the actuator and position sensor. Bypass line from the stop valve to the backbone of low pressure is located bypass valve with actuator and position sensor to provide the same throughput with the regulator. Moreover, the regulator and bypass valve can be made in the form of two valves with a single drive. This embodiment of the system will improve the reliability of gas when using turbo-expanders at gas distribution stations. 1 C.p. f-crystals, 2 Il.

The present invention relates to the field of turbine construction, such as control systems of turboexpanders.

Known regulating device turboexpander used as the upper stage engine when starting the gas turbine, where the regulating device controls Rascani coupling between walama steam and gas turbines, containing the supply of steam or gas to the turbine stop and control valves [2].

The well-known scheme of the experimental setup the expander for power generation, where the regulation of the supply of gas to the expander and the pressure before and behind him is carried out by means of regulating valves [3].

To maintain a user may need constant pressure gas pipelines of high pressure supplied to the customer, install a gas distribution station (GDS) (or gas control points (GCP)), where the gas pressure regulate by means of the pressure regulator. Can be installed on gas distribution stations and gas control points (in parallel) of turboexpanders (for example, to drive an electric generator or pump, and so on). Typically, regulators pressure distribution (and fracturing) have insufficient performance. Resulting in actuation of the locking member on the expander (for example, when an emergency stop) and the termination of the gas passes through the expander to the consumer regulators GDS are not able to quickly restore the desired pressure, and the consumer, may only temporarily, may be without gas, which, as a rule, neopost what's stations (and fracturing) with turboexpanders.

The essential features of the invention are controlled electric or pneumatic control devices the stop valve, the regulator (for example, in the form of an inlet guide vane and the bypass valve, the stopper valve is made in the form of mechanically interconnected and permeable to gas in the separate discharge line two (single seat or dvuhnedelnik) valves so that when one valve is open the other is closed, a bypass line connecting the stop valve with a turboexpander, has a regulatory body with the actuator and the position sensor, and a bypass line connecting the stop valve to the main low pressure, is the bypass valve with actuator and position sensor, with the possibility of simultaneous provide the same throughput with the regulator, with the implementation of the regulatory body and the bypass valve in the form of two mechanically interconnected valves with a single drive and the same bandwidth.

Distinctive features of the invention are executing a stop valve in the form of a mechanically linked to each other and the Dean valve is open, the second is closed, while the outlet line connecting the stop valve with a turboexpander, has a regulatory body with the actuator and the position sensor, and a bypass line connecting the stop valve with a line of low pressure is located bypass valve with actuator and position sensor, with the possibility of simultaneous provide the same throughput with the regulator, with the implementation of the regulatory body and the bypass valve in the form of two mechanically interconnected valves with a single drive and the same bandwidth.

In Fig. 1 shows schematically one of the options management system expander; Fig. 2 - another option.

Mainline high pressure to the gas station 1 is connected through a system of shut-off valves 2, line 3, valve 4 quick-acting stop valve 5, the outlet line 6 and the regulator 7 (for example, in the form of inlet guide vanes) with actuator 8 (e.g., electric or pneumatic) and the position sensor 9 with the expander 10, also related highway 11 and system shut-off valve 12 to the main low pressure, i.e., that is coupled to a line of low pressure, bypassing the expander 10, through a system of shut-off valves 2, line 3, valve 13 quick-acting stop valve 5, the discharge line 14, the bypass valve 15 with the actuator 16 (e.g., electric or pneumatic) and the position sensor 17, highway 11 and the system shut-off valve 12. To control the expander 10 is installed aggregate automation 18.

The system works regulation turboexpander as follows. At the start of the expander 10 on command from the system power automation 18 valve 4 of the stopper valve 5 is opened and the gas is supplied to the regulator 7 and later in the expander 10. The expander 10 kicks in. The valve 13 in the stop valve 5 is closed at this, blocking the path of gas to the bypass valve 15, but the bypass valve 15 is opened at this time (although the gas flow through it there) on command from the system power automation 18 according to the signals of the position sensors 9 and 17, simultaneously tracking the position of the regulator 7. Meanwhile the capacity of the bypass valve 15 is equal to the bandwidth of the regulatory body 7. At an emergency stop of the expander 10, the valve 4 in the stop valve 5 will quickly block the gas flow high on the rim of the expander 10 through the bypass valve 15 (with throttling). As a result, the amount of gas (low pressure) supplied to the consumer, will not change when you stop expander 10, and possible small changes in the gas pressure will adjust the pressure regulators on gas distribution station. System motor-operated valves 4 and 12 is necessary for the correct and safe filling gas, start, stop turboexpander 10 and disconnect it from mains high and low pressures. In the case of performing the regulatory body 7 and the bypass valve 15 in the form of two mechanically interconnected valves (in one case) with a single actuator 8 (Fig. 2) works control system as described above (Fig. 1), only eases the task of providing the same bandwidth regulator 7 and the bypass valve 15 (not required position sensor 17 and the actuator 16 to the bypass valve 15 and tracking algorithm).

In the turboexpander can be used up to 80% of the gas flow passing through the gas distribution station.

1. The control system expander installed on the gas station between lines of high and low pressure containing upravlyaema, characterized in that it contains a bypass valve and the stop valve is made in the form of mechanically interconnected and permeable to gas in the separate discharge line of the two valves so that when one valve is open the other is closed, while the outlet line connecting the stop valve with a turboexpander, has a regulatory body with the actuator and the position sensor, and a bypass line connecting the stop valve with a line of low pressure is located bypass valve with actuator and position sensor, with the possibility of simultaneous provide the same throughput with the regulatory body.

2. The system under item 1, characterized in that the regulator and bypass valve consists of two mechanically interconnected valves with a single drive and the same bandwidth.

 

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