CN210738626U - Integrated control system for natural gas waste heat power generation - Google Patents

Abstract

The utility model provides a natural gas waste heat power generation uses integrated control system, contains generator and steam turbine, characterized by that which belongs to the technical field of waste heat power generation: the system also comprises a generator monitoring system, a DEH steam turbine monitoring system and an ETS control system; the generator monitoring system comprises TSI shaft displacement clamps, detectors, prepositioners AND a DCS judgment system, the DCS judgment system comprises an OR module I AND an AND module I, a plurality of detectors are arranged on two sides of a generator main shaft bearing at intervals, the detectors are in one-to-one corresponding signal connection with the prepositioners respectively, the prepositioners are in one-to-one corresponding signal connection with the TSI shaft displacement clamps respectively, AND the TSI shaft displacement clamps on two sides of the axis of the generator main shaft bearing are in corresponding signal connection with the OR module I respectively; the utility model discloses effectively solved current control system reliability poor, produced the problem of erroneous judgement easily.

Description

Integrated control system for natural gas waste heat power generation

Technical Field

The utility model belongs to the technical field of the waste heat power generation technique and specifically relates to a natural gas is integrated control system for waste heat power generation.

Background

As is known, natural gas needs to be continuously pressurized in the process of long-distance transportation, and a large amount of heat energy is generated in the pressurizing process, in the prior art, the heat energy generated in the pressurizing process of natural gas can be converted into electric energy through a steam turbine and a generator, so that the resource amount is avoided; with the continuous increase of the capacity of a turbo generator set, steam parameters are higher and higher, a thermodynamic system is more and more complex, for improving the economy of the set, a moving gap and a static gap of a steam turbine and a shaft seal gap are selected to be smaller, the rotating speed of the steam turbine is higher, in the starting, running or stopping process of the set, due to improper operation or faults of some related equipment, the rotating part and the static part of the steam turbine are easy to rub to cause serious accidents such as blade damage, large shaft bending, thrust bush burning and the like, for ensuring the safe starting, stopping and normal running of the set, mechanical parameters such as axial displacement, rotating speed, vibration and the like of the steam turbine or a generator need to be monitored and abnormally protected, and when the monitored parameters exceed an alarm value, an alarm signal is sent; the control system for realizing the function is called a steam turbine protection system, also called a crisis interruption system or an ETS control system, but most of the existing ETS control systems collect stop signals through a switching value input module of a PLC or a DCS, carry out logic operation in a controller of the PLC or the DCS, and output the stop signals through a switching value output module according to the operation result.

Disclosure of Invention

In order to overcome not enough in the background art, the utility model discloses a natural gas is integrated control system for cogeneration.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a comprehensive control system for natural gas waste heat power generation comprises a generator, a steam turbine, a generator monitoring system, a DEH steam turbine monitoring system and an ETS control system; the generator monitoring system comprises TSI shaft displacement clamps, detectors, prepositioners AND a DCS judgment system, the DCS judgment system comprises an OR module I AND an AND module I, a plurality of detectors are arranged on two sides of a generator main shaft bearing at intervals, the detectors are in one-to-one corresponding signal connection with the prepositioners respectively, the prepositioners are in one-to-one corresponding signal connection with the TSI shaft displacement clamps respectively, the TSI shaft displacement clamps on two sides of the axis of the generator main shaft bearing are in corresponding signal connection with the OR module I respectively, the two OR modules I are in corresponding signal connection with the AND module I, AND the AND module I is in corresponding signal connection with the ETS control system; the DEH steam turbine monitoring system comprises a signal acquisition module, an input module and an input controller which are sequentially in signal communication, the input controller is in corresponding signal connection with the ETS control system, and a vibration signal acquisition unit of the signal acquisition module is correspondingly fixed on the outer wall of a steam turbine main shaft bearing bush; the ETS control system comprises two processors, an OR module II, an AND module II AND an executing mechanism, wherein a plurality of mutually independent protection logic modules are arranged in the processors, the protection logic modules of the same processor are in signal connection with the AND module II correspondingly, the two AND modules II are in signal connection with the OR module II correspondingly, AND the OR module II is in signal connection with the executing mechanism correspondingly.

Preferably, the two AND modules ii of the ETS control system are both provided with a watchdog circuit.

Preferably, the ETS control system is integrated with an alarm device, and a buzzer and a warning lamp are integrated in the alarm device.

Preferably, the signal acquisition module is integrated with a temperature measurement unit for monitoring the temperature of the main shaft of the steam turbine.

Preferably, the ETS control system can upload data in real time through a server and remotely control the data through a remote controller.

Preferably, the processor of the ETS control system is an FPGA.

Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has:

the utility model discloses a natural gas is integrated control system for waste heat power generation, simple structure, easily assembly, manufacturing cost is lower, the axle displacement that the detector detected is converted into analog quantity signal transmission to TSI axle displacement fastener through the leading ware, judge by TSI axle displacement fastener whether with analog quantity signal conversion stop signal, a plurality of TSI axle displacement fastener correspondences that are located generator main shaft bearing axis both sides correspond with an OR module I AND correspond the signal connection, two OR modules I correspond the signal connection with AND module I, this AND module I corresponds the signal connection with ETS control system, can improve DCS judgement system's reliability through OR module I AND AND module I's logical operation promptly, AND then improve generator monitoring system's reliability; after a processor of the ETS control system receives a shutdown signal sent by a generator monitoring system OR a DEH steam turbine monitoring system, a plurality of mutually independent protection logic modules arranged in the processor can respectively carry out logic operation, the operation result is input into an AND module II, the AND module II carries out AND logic AND then transmits the signal to an OR module II, the OR module II feeds the shutdown signal back to an executing mechanism, the executing mechanism executes a shutdown protection action, AND meanwhile, the two processors are arranged to form a redundancy design, so that the reliability of the ETS control system is effectively improved, AND system misjudgment OR system failure caused by damage of the processors is avoided.

Drawings

Fig. 1 is a schematic diagram of the system structure of the present invention.

In the figure: 1. a generator; 2. a steam turbine; 3. TSI axis displacement dogs; 4. a detector; 5. a pre-positioning device; 6. an OR module I; 7. an AND module I; 8. a signal acquisition module; 9. an input module; 10. an input controller; 11. an OR module II; 12. an AND module II; 13. an actuator; 14. a protection logic module; 15. and an alarm device.

Detailed Description

The invention will be explained in more detail by the following examples, which disclose the invention and are intended to protect all technical improvements within the scope of the invention.

With reference to fig. 1, the comprehensive control system for natural gas waste heat power generation comprises a generator 1 and a turbine 2, and further comprises a generator monitoring system, a DEH turbine monitoring system and an ETS control system; the generator monitoring system comprises TSI shaft displacement clamps 3, detectors 4, prepositioners 5 AND a DCS judgment system, the DCS judgment system comprises an OR module I6 AND an AND module I7, a plurality of detectors 4 are arranged on two sides of a main shaft bearing of the generator 1 at intervals, the detectors 4 are respectively in one-to-one corresponding signal connection with the prepositioners 5, the prepositioners 5 are respectively in one-to-one corresponding signal connection with the TSI shaft displacement clamps 3, namely, shaft displacement detected by the detectors 4 is converted into analog quantity signals through the prepositioners 5 AND transmitted to the TSI shaft displacement clamps 3, whether the analog quantity signals are converted into stop signals OR not is judged by the TSI shaft displacement clamps 3, the TSI shaft displacement clamps 3 on two sides of the main shaft bearing axis of the generator 1 are respectively in corresponding signal connection with the OR module I6, the two OR modules I6 are in corresponding signal connection with the AND module I7, the AND module I7 is in corresponding signal connection with the ETS control system, so that the reliability of the DCS judgment system can be improved through the logical operation of the OR module I6 AND the AND module I7, AND the reliability of the generator monitoring system is further improved;

the DEH steam turbine monitoring system comprises a signal acquisition module 8, an input module 9 and an input controller 10 which are sequentially in signal communication, wherein the input controller 10 is in corresponding signal connection with the ETS control system, a vibration signal acquisition unit of the signal acquisition module 8 is correspondingly fixed on the outer wall of a main shaft bearing bush of the steam turbine 2, namely, the signal acquisition module 8 feeds acquired information back to the input module 9, the input module 9 converts an analog signal into a digital signal and transmits the digital signal to the input controller 10, and the input controller 10 performs logic judgment on the received signal and transmits a judgment result to the ETS control system; according to the requirement, the signal acquisition module 8 is integrated with a temperature measurement unit for monitoring the temperature of the main shaft of the steam turbine 2, namely the signal acquisition module 8 can monitor the temperature of the main shaft of the steam turbine 2 in real time while acquiring the vibration information of the main shaft of the steam turbine 2, so that the monitoring information is more comprehensive, and the stable operation of the steam turbine 2 is ensured;

the ETS control system comprises two processors, an OR module II 11, an AND module II 12 AND an executing mechanism 13, wherein a plurality of mutually independent protection logic modules 14 are arranged in the processors; according to the requirement, a processor of the ETS control system is an FPGA; a plurality of protection logic blocks 14 of the same processor are correspondingly connected with signals of one AND block II 12, two AND blocks II 12 are correspondingly connected with signals of an OR block II 11, the OR block II 11 is correspondingly connected with signals of an executing mechanism 13, namely, after the processor of the ETS control system receives a shutdown signal sent by the generator monitoring system or the DEH turbine monitoring system, a plurality of mutually independent protection logic modules 14 arranged inside the processor can respectively carry out logic operation, AND the operation result is input into an AND module II 12, after the AND module II 12 carries out AND logic, the signal is transmitted to an OR module II 11, the OR module II 11 feeds the stop signal back to an actuating mechanism 13, the actuating mechanism 13 executes the stop protection action, meanwhile, two processors are arranged to form a redundancy design, so that the reliability of the ETS control system is effectively improved, and system misjudgment or system failure caused by damage of the processors is avoided; according to the requirement, the two AND modules II 12 of the ETS control system are respectively provided with a watchdog circuit, namely, the output signal of the watchdog circuit AND the multi-path signal output by the processor are output to the AND module II 12 together to carry out AND logic, AND then a protection action signal is output, on one hand, the watchdog circuit can reset AND correct the processor in time when the processor is abnormal, on the other hand, the watchdog circuit can cut off the signal output of the ETS control system when the watchdog circuit acts, AND the ETS control system is prevented from misjudging operation; in addition, alarm device 15 is integrated to the ETS control system, and bee calling organ and warning light are integrated in this alarm device 15, promptly when ETS control system can trigger alarm device 15 and send out alarm information when making the shutdown protection action, ETS control system can upload data in real time through the server to through remote control ware remote control, promptly operating personnel can be through the operation of remote control ware real-time supervision generator 1 and steam turbine 2, and in time make corresponding processing to urgent alarm information.

Implement natural gas is integrated control system for cogeneration, locate generator 1 and steam turbine 2's relevant position respectively with detector 4 and signal acquisition module 8 during the use to guarantee that each signal transmission structure is unblocked, surpass the safe value and judge through corresponding "and OR gate" logic and transmit to ETS control system after as the information that detector 4 and signal acquisition module 8 collected, ETS control system control actuating mechanism 13 carries out the shutdown protection operation, thereby guarantee generator 1 and steam turbine 2's safe operation.

The part of the utility model not detailed is prior art.

Claims (6)

1. The utility model provides a natural gas cogeneration uses integrated control system, contains generator (1) and steam turbine (2), characterized by: the system also comprises a generator monitoring system, a DEH steam turbine monitoring system and an ETS control system; the generator monitoring system comprises TSI shaft displacement clamping pieces (3), detectors (4), prepositioners (5) AND a DCS judgment system, the DCS judgment system comprises an OR module I (6) AND an AND module I (7), a plurality of detectors (4) are arranged on two sides of a main shaft bearing of the generator (1) at intervals, the detectors (4) are respectively in one-to-one corresponding signal connection with the prepositioners (5), the prepositioners (5) are respectively in one-to-one corresponding signal connection with the TSI shaft displacement clamping pieces (3), the TSI shaft displacement clamping pieces (3) on two sides of a main shaft bearing axis of the generator (1) are respectively in corresponding signal connection with the OR module I (6), the two OR modules I (6) are in corresponding signal connection with the AND module I (7), AND the AND module I (7) is in corresponding signal connection with the ETS control system; the DEH steam turbine monitoring system comprises a signal acquisition module (8), an input module (9) and an input controller (10) which are sequentially in signal communication, wherein the input controller (10) is correspondingly in signal connection with the ETS control system, and a vibration signal acquisition unit of the signal acquisition module (8) is correspondingly fixed on the outer wall of a main shaft bearing bush of the steam turbine (2); the ETS control system comprises two processors, an OR module II (11), an AND module II (12) AND an executing mechanism (13), wherein a plurality of mutually independent protection logic modules (14) are arranged in the processors, the protection logic modules (14) of the same processor are correspondingly in signal connection with the AND module II (12), the two AND modules II (12) are correspondingly in signal connection with the OR module II (11), AND the OR module II (11) is correspondingly in signal connection with the executing mechanism (13).

2. The integrated control system for natural gas waste heat power generation according to claim 1, characterized in that: AND two AND modules II (12) of the ETS control system are respectively provided with a watchdog circuit.

3. The integrated control system for natural gas waste heat power generation according to claim 1, characterized in that: the ETS control system is integrated with an alarm device (15), and a buzzer and a warning lamp are integrated in the alarm device (15).

4. The integrated control system for natural gas waste heat power generation according to claim 1, characterized in that: and the signal acquisition module (8) is integrated with a temperature measurement unit for monitoring the temperature of the main shaft of the steam turbine (2).

5. The integrated control system for natural gas waste heat power generation according to claim 1, characterized in that: the ETS control system can upload data in real time through the server and can be remotely controlled through the remote controller.

6. The integrated control system for natural gas waste heat power generation according to claim 1, characterized in that: and the processor of the ETS control system is an FPGA.

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