CN210370811U

CN210370811U - System for solving overhigh return oil temperature of back pressure type steam turbine thrust pads and bearings in distributed energy system

Info

Publication number: CN210370811U
Application number: CN201920433860.2U
Authority: CN
Inventors: 周宇昊; 王勇; 郭敏; 阮慧峰; 刘丽丽; 张钟平
Original assignee: Huadian Electric Power Research Institute Co Ltd
Current assignee: Huadian Electric Power Research Institute Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2020-04-21
Anticipated expiration: 2029-04-02

Abstract

The utility model relates to a system for solving overhigh temperature of thrust pads and bearing return oil of a back pressure turbine in a distributed energy system, which comprises a gas turbine, a waste heat boiler, a generator, a smoke type lithium bromide unit, a steam type lithium bromide unit, a compressed air cooler and the back pressure turbine; compressed air is directly introduced into a bearing bush oil seal of the back pressure turbine after being cooled and is discharged from an oil baffle plate to reduce the oil return temperature of the bearing, and a threaded armored thermocouple is used for replacing an inserted thermocouple, so that the problem of inaccurate measurement of the bearing temperature is solved, and the operation efficiency of the unit can be improved to the maximum effect.

Description

System for solving overhigh return oil temperature of back pressure type steam turbine thrust pads and bearings in distributed energy system

Technical Field

The utility model relates to a solve among distributed energy system back pressure steam turbine thrust tile and too high system of bearing oil return temperature belongs to distributed energy system's optimization operation.

Background

The back pressure type steam turbine set has the characteristics of high exhaust pressure, few stages of through-flow parts, simple structure and light weight and low manufacturing cost, is relatively suitable for being applied to a distributed energy system with stable thermal load all the year round, such as a Chinese patent with the application number of 201610240711.5, however, the back pressure type steam turbine is easy to deform under the action of stress due to the special defect of cylinder casting in the operation process, and the expansion gap between a clapboard air seal sleeve and a hanger pressing plate is not suitable, so that the axial displacement of the steam turbine moves back and forth, and the safe and stable operation of the set is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a system that back pressure steam turbine thrust tile and bearing return oil temperature are too high among the solution distributed energy system, the operating efficiency of the improvement unit of ability maximum utility.

The utility model provides a technical scheme that above-mentioned problem adopted is: a system for solving overhigh temperature of a thrust pad and bearing return oil of a back pressure turbine in a distributed energy system is characterized by comprising a gas turbine, a waste heat boiler, a generator, a smoke type lithium bromide unit, a steam type lithium bromide unit, a compressed air cooler and the back pressure turbine; the exhaust port of the gas turbine is connected with a waste heat boiler, a steam outlet of the waste heat boiler is connected with a back pressure turbine, a first steam exhaust electric valve is arranged between the waste heat boiler and the back pressure turbine, the back pressure turbine is coaxially connected with a generator, a compressed air cooler is connected to a first bearing of the back pressure turbine through a compressed air input pipeline for cooling, a thread armored thermal resistor is mounted on the first bearing, one steam exhaust pipeline of the back pressure turbine is connected to an industrial heat user, one steam exhaust pipeline of the back pressure turbine is provided with a steam exhaust pipe, an exhaust regulating valve and a second steam exhaust electric valve are mounted on the steam exhaust pipe, and a heat supply emergency blocking valve and an exhaust stop valve are mounted between the steam exhaust pipe and the industrial heat user; the other path of steam exhaust pipeline of the back pressure steam turbine is connected with a steam type lithium bromide unit, and the steam type lithium bromide unit is connected with a cold and hot user; the flue gas outlet of the waste heat boiler is connected with a flue gas type lithium bromide unit, and the flue gas type lithium bromide unit is connected with a cold and hot user.

Furthermore, a second bearing and a third bearing are further mounted on the main shaft of the back pressure turbine, and the second bearing and the third bearing are located in front of the generator.

Further, a fourth bearing is further mounted on the main shaft of the back pressure turbine, and the fourth bearing is located behind the generator.

The working method of the system for solving the problem of overhigh temperature of the thrust pads and the bearing return oil of the back pressure turbine in the distributed energy system is as follows: the natural gas is used for acting to generate power in the gas turbine, the smoke discharged by the gas turbine enters the waste heat boiler to produce steam, the steam discharged by the waste heat boiler is controlled by the steam discharging electric valve to enter the back pressure turbine to drive the generator to generate power, the compressed air is cooled by the compressed air cooler, the cooled compressed air enters the first bearing of the back pressure turbine, so that the oil return temperature of the bearing is reduced, the compressed air is discharged from an oil baffle, the oil return temperature of the first bearing is measured by the thread armored thermal resistor, and the error caused by the insertion type thermal resistor measurement is avoided; the second bearing, the third bearing and the fourth bearing play a role in supporting the main shaft of the back pressure turbine; in the debugging and initial starting stage, the opening degrees of an air inlet regulating valve and an exhaust regulating valve of the back pressure turbine are controlled simultaneously, so that the back pressure turbine always moves in the central position, and the overhigh temperature and the axial displacement deviation of a thrust pad are avoided;

the control phase operates as follows: the opening degree of an air inlet adjusting valve of the back pressure turbine in the impulse phase is 30%, the emptying adjusting valve is fully opened, then the air inlet adjusting valve is opened at the speed of 2%, the emptying adjusting valve is closed at the speed of 1.5%, and the emptying adjusting valve is fully closed until the air inlet adjusting valve is fully opened, so that the back pressure turbine reaches the balance.

The flue gas that the exhaust-heat boiler discharged passes through flue gas type lithium bromide unit and supplies cold and hot user, and industry hot user is directly supplied with to back pressure steam turbine exhaust steam partly, and another part is input steam type lithium bromide unit and is supplied with cold and hot user, realizes heat supply winter, the cooling of summer.

Compared with the prior art, the utility model, have following advantage and effect: the utility model discloses utilize the compressed air directly to let in back pressure turbine's axle bush oil blanket department after the cooling, discharge from the oil baffle, be used for reducing the oil return temperature of bearing to utilize screw thread armor type thermocouple to replace bayonet thermocouple, solve the inaccurate problem of bearing temperature measurement.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure: the system comprises a gas turbine 1, a waste heat boiler 2, a first steam exhaust electric valve 3, a compressed air input pipeline 4 for cooling, a first bearing 5, a thread armored thermal resistor 6, a second bearing 7, a third bearing 8, a generator 9, a fourth bearing 10, a steam exhaust pipe 11, an exhaust regulating valve 12, a second steam exhaust electric valve 13, a heat supply emergency blocking valve 14, an exhaust stop valve 15, an industrial heat user 16, a flue gas type lithium bromide unit 17, a steam type lithium bromide unit 18, a cold and hot user 19, a compressed air cooler 20 and a back pressure turbine 21.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

Referring to fig. 1, the system for solving the problem of excessive temperature of the back pressure turbine thrust pad and the bearing return oil in the distributed energy system in the embodiment includes a gas turbine 1, a waste heat boiler 2, a generator 9, a flue gas type lithium bromide unit 17, a steam type lithium bromide unit 18, a compressed air cooler 20 and a back pressure turbine 21.

An exhaust port of the gas turbine 1 is connected with a waste heat boiler 2, a steam outlet of the waste heat boiler 2 is connected with a back pressure turbine 21, a first steam exhaust electric valve 3 is arranged between the waste heat boiler 2 and the back pressure turbine 21, the back pressure turbine 21 is coaxially connected with a generator 9, a compressed air cooler 20 is connected to a first bearing 5 of the back pressure turbine 21 through a compressed air input pipeline 4 for cooling, a thread armored thermal resistor 6 is installed on the first bearing 5, one steam exhaust pipeline of the back pressure turbine 21 is connected to an industrial heat user 16, a steam exhaust pipe 11 is arranged on one steam exhaust pipeline of the back pressure turbine 21, an exhaust adjusting valve 12 and a second steam exhaust electric valve 13 are installed on the steam exhaust pipe 11, and a heat supply emergency blocking valve 14 and a steam exhaust stop valve 15 are installed between the steam exhaust pipe 11 and the industrial heat user 16; the other path of steam exhaust pipeline of the back pressure turbine 21 is connected with a steam type lithium bromide unit 18, and the steam type lithium bromide unit 18 is connected with a cold and hot user 19; the smoke outlet of the waste heat boiler 2 is connected with a smoke type lithium bromide unit 17, and the smoke type lithium bromide unit 17 is connected with a cold and hot user 19.

In this embodiment, the main shaft of the back pressure turbine 21 is further provided with a second bearing 7, a third bearing 8 and a fourth bearing 10, the second bearing 7 and the third bearing 8 are located in front of the generator 9, and the fourth bearing 10 is located behind the generator 9.

The working method comprises the following steps: the natural gas is used for acting to generate power in the gas turbine 1, the flue gas discharged by the gas turbine 1 enters the waste heat boiler 2 to generate steam, the steam discharged by the waste heat boiler 2 is controlled by the first steam discharge electric valve 3 to enter the back pressure turbine 21 to drive the generator 9 to generate power, the compressed air is cooled by the compressed air cooler 20, the cooled compressed air enters the first bearing 5 of the back pressure turbine 21, so that the oil return temperature of the bearing is reduced, the compressed air is discharged from an oil stop, the oil return temperature of the first bearing 5 is measured by the thread armored thermal resistor 6, and the error caused by the measurement of the inserted thermal resistor is avoided; the second bearing 7, the third bearing 8 and the fourth bearing 10 play a role in supporting the main shaft of the back pressure turbine 21; in the debugging and initial starting stage, the opening degrees of an air inlet regulating valve and an exhaust regulating valve 12 of the back pressure turbine 21 are controlled simultaneously, so that the back pressure turbine 21 always moves at the central position, and the overhigh temperature and the axial displacement deviation of a thrust pad are avoided;

the control phase operates as follows: the opening degree of the inlet damper of the back pressure turbine 21 in the impulse phase is 30%, the evacuation regulating valve 12 is fully opened, then the inlet damper is opened at a rate of 2%, the evacuation regulating valve 12 is closed at a rate of 1.5%, and until the inlet damper is fully opened, the evacuation regulating valve 12 is fully closed, and the back pressure turbine 21 reaches balance.

The flue gas that exhaust-heat boiler 2 discharged is supplied to cold and hot user 19 through flue gas type lithium bromide unit 17, and industrial heat user 16 is directly supplied to some steam that back pressure steam turbine 21 discharged, and another part inputs steam type lithium bromide unit 18 and supplies cold and hot user 19, realizes heat supply in winter, the cooling of summer.

Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.

Claims

1. A system for solving overhigh temperature of a thrust pad and bearing return oil of a back pressure turbine in a distributed energy system is characterized by comprising a gas turbine (1), a waste heat boiler (2), a generator (9), a smoke type lithium bromide unit (17), a steam type lithium bromide unit (18), a compressed air cooler (20) and the back pressure turbine (21); the exhaust port of the gas turbine (1) is connected with the waste heat boiler (2), the steam outlet of the waste heat boiler (2) is connected with the back pressure turbine (21), a steam exhaust electric valve (3) is arranged between the waste heat boiler (2) and the back pressure turbine (21), the back pressure turbine (21) is coaxially connected with the generator (9), the compressed air cooler (20) is connected to a bearing (5) of the back pressure turbine (21) through a compressed air input pipeline (4) for cooling, a thread armored thermal resistor (6) is installed on the bearing (5), one path of steam exhaust pipeline of the back pressure turbine (21) is connected to an industrial heat user (16), a steam exhaust pipe (11) is arranged on one path of steam exhaust pipeline of the back pressure turbine (21), an exhaust regulating valve (12) and a second steam exhaust electric valve (13) are installed on the steam exhaust pipe (11), a heat supply emergency blocking valve (14) and a steam exhaust stop valve (15) are arranged between the steam emptying pipe (11) and an industrial heat user (16); the other path of steam exhaust pipeline of the back pressure turbine (21) is connected with a steam type lithium bromide unit (18), and the steam type lithium bromide unit (18) is connected with a cold and hot user (19); the flue gas outlet of the waste heat boiler (2) is connected with a flue gas type lithium bromide unit (17), and the flue gas type lithium bromide unit (17) is connected with a cold and hot user (19).

2. The system for solving the problem of overhigh temperature of the thrust pads and the return oil of the back pressure turbine in the distributed energy system is as claimed in claim 1, wherein a second bearing (7) and a third bearing (8) are further mounted on the main shaft of the back pressure turbine (21), and the second bearing (7) and the third bearing (8) are positioned in front of the generator (9).

3. The system for solving the problem of overhigh return oil temperature of the thrust pads and the bearings of the back pressure turbine in the distributed energy system is as claimed in claim 1, wherein a bearing number four (10) is further mounted on the main shaft of the back pressure turbine (21), and the bearing number four (10) is located behind the generator (9).