Speed regulating system of steam-driven pump

Abstract

The utility model relates to a steam-driven pump speed regulating system, which comprises a steam turbine and a motor, the motor drives the steam turbine to operate, one side of the steam turbine far away from the motor is connected with a feed pump through a tooth-shaped coupling, a steam inlet end and a steam exhaust end are respectively arranged on the steam turbine, and the steam inlet end and the steam exhaust end are respectively connected with a steam inlet pipeline and a steam exhaust pipeline. The steam inlet pipeline is connected with boiler steam, the electric control valve, the speed adjusting device and the shutdown protection device are sequentially arranged on the steam inlet pipeline, the steam valve opening degree of the steam turbine is adjusted through the speed adjusting device, the entering steam amount is controlled, and therefore the steam inlet amount is adjusted, and the rotating speed of the steam turbine is adjusted. The shutdown protection device is used for protecting the steam turbine during shutdown, the number of the steam exhaust pipelines is at least one, each steam exhaust pipeline is provided with an electric valve, and the steam turbine, the electric control valves, the speed adjusting device and the shutdown protection device are all controlled by a DCS. The device has the advantages of simple and reasonable structure, high efficiency, safety, stable operation and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to steam turbine technical field relates to a steam pump governing system. BACKGROUND

[0002] Steam turbine is also called steam turbine engine, it is a kind of rotary steam power device, high temperature and high pressure steam becomes accelerated airflow after passing fixed nozzle and is injected to blade, makes the rotor with blade row rotates, simultaneously does work to outside.Steam turbine is the main equipment of modern thermal power plant, also is used in metallurgical industry, chemical industry, ship power device.The existing steam turbine is provided with steam turbine governor on exhaust end, but the governor cannot realize automatic regulation of steam turbine speed, and when steam turbine or boiler is in emergency stop, due to the absence of protection device, unnecessary loss can be caused.

[0003] Therefore, a steam pump governing system is designed to overcome the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the deficiencies in prior art, and provides a steam pump governing system with simple and reasonable structure, high efficiency and safety and stable operation.

[0005] The utility model is realized through the following technical scheme: a steam pump governing system, including steam turbine and motor connected with steam turbine, steam turbine is driven by motor to work, the side away from motor of steam turbine is connected with water pump through gear coupling, steam inlet end and exhaust end are arranged on steam turbine respectively, steam inlet end and exhaust end are connected with steam inlet pipeline and exhaust pipeline respectively, steam inlet pipeline is connected with boiler steam, and electric control valve, speed regulation device and shutdown protection device are sequentially arranged on steam inlet pipeline, the opening of steam turbine gate is adjusted by speed regulation device, the amount of entering steam is controlled, so as to adjust the steam inlet amount and the rotating speed of steam turbine, the shutdown protection device is used to protect steam turbine when stopping, the exhaust pipeline is at least one, and electric valve is arranged on each exhaust pipeline, the steam turbine, electric control valve, speed regulation device, shutdown protection device and electric valve are controlled by DCS system.

[0006] As preferred: the speed regulation device is electric regulating valve with PID control system, PID control system is arranged between DCS system and electric regulating valve, is used to electrically regulate electric regulating valve, the opening of steam turbine gate is adjusted, the amount of entering steam is controlled, so as to adjust the rotating speed of steam turbine.

[0007] As preferred: the shutdown protection device is steam turbine governor, and the model is 2301E.

[0008] As preferred: the steam turbine and the feed water pump are provided with a gear box, the gear box is connected with the steam turbine and the feed water pump respectively, and is used for adjusting rotating speed and transmitting torque.

[0009] As preferred: the suction end and the discharge end of the feed water pump are connected with the inlet pipeline and the outlet pipeline respectively, the electric control valve is arranged on the inlet pipeline and the outlet pipeline respectively, and the outlet pipeline is connected with the boiler for water supply.

[0010] The utility model discloses the beneficial effects are as follows:

[0011] The speed regulating system designed by the utility model increases an electric regulating valve before the original regulating door of the steam turbine, when starting, the original steam inlet regulating door is fully opened, and the regulating valve is matched with the regulating door to adjust and increase the PID control of the regulating valve in the DCS system, so that the automatic control of the target rotating speed is realized, the steam turbine speed regulator 2301E has the stop protection kinetic energy, the protection switching and the protection output are arranged in the DCS system, and finally the protection output action is completed on the steam turbine speed regulator 2301E. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the whole structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] In order to make the ordinary skilled in the art more clearly understand the purpose, technical scheme and advantages of the utility model, the utility model is further described below in combination with the drawings and examples.

[0014] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms such as "up", "down", "left", "right", "inner", "outer", "horizontal", "vertical" is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, therefore, it can not be understood as the limitation of the utility model.

[0015] The utility model will be described in detail in combination with the drawings as follows: Figure 1As shown, a steam-driven pump speed regulating system comprises a steam turbine 1 and a motor 2 connected to the steam turbine 1, the motor 2 drives the steam turbine 1 to work, a gear coupling is arranged between the steam turbine 1 and a water pump 4 away from the motor 2, an inlet end 5 and an exhaust end 6 are arranged on the steam turbine 1, the inlet end 5 and the exhaust end 6 are connected with an inlet pipeline 7 and an exhaust pipeline 8 respectively, the inlet pipeline 7 is connected with a boiler steam, and an electric control valve 9, a speed regulating device and a shutdown protection device are sequentially arranged on the inlet pipeline 7, the speed regulating device is used for adjusting the opening degree of the steam turbine, thereby controlling the steam entering amount, and then the steam turbine speed is adjusted, the shutdown protection device is used for protecting the steam turbine 1 when the steam turbine 1 is stopped, and the exhaust pipeline 8 is at least one, and an electric valve 10 is arranged on each exhaust pipeline 8, and the steam turbine 1, the electric control valve, the speed regulating device, the shutdown protection device and the electric valve 10 are controlled by a DCS system.

[0016] The speed regulating device is an electric regulating valve 11 with a PID control system, the PID control system is arranged between the DCS system and the electric regulating valve 11, and is used for electrically regulating the electric regulating valve 11, thereby adjusting the opening degree of the steam turbine 1, controlling the steam entering amount, and then adjusting the steam turbine speed. The shutdown protection device is a steam turbine speed regulator 12 with a model number of 2301E. A gear box 3 is arranged between the steam turbine 1 and the water pump 4, the gear box 3 is connected with the steam turbine 1 and the water pump 4 respectively, and is used for adjusting the speed and transmitting the torque. The suction end 13 and the discharge end 14 of the water pump 4 are connected with an inlet pipeline 15 and an outlet pipeline 16 respectively, electric control valves are arranged on the inlet pipeline 15 and the outlet pipeline 16 respectively, and the outlet pipeline 16 is connected with a boiler to supply water.

[0017] The steam turbine pump speed regulating system increases an electric regulating valve in front of an original regulating valve of the steam turbine, when starting, the original inlet regulating valve is fully opened, a regulating valve matched regulating valve is adjusted, a PID control of the regulating valve is added in the DCS system, automatic control of the target speed is realized, the steam turbine speed regulator 2301E has a shutdown protection function, protection switching and protection output are arranged in the DCS system, and finally the protection output action is completed on the steam turbine speed regulator 2301E.

[0018] The specific embodiments described in the present application are only illustrative of the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in the present application should be covered by the claims of the present application.

Claims

1. A steam turbine pump speed governing system, comprising a steam turbine (1) and an electric motor (2) connected to the steam turbine (1), the steam turbine (1) being driven by the electric motor (2) to perform work, characterized in that: The steam turbine (1) is connected to the water pump (4) through a gear coupling on the side away from the motor (2), an inlet end (5) and an exhaust end (6) are respectively arranged on the steam turbine (1), the inlet end (5) and the exhaust end (6) are respectively connected to an inlet pipeline (7) and an exhaust pipeline (8), the inlet pipeline (7) is connected to the boiler steam, and a motor control valve (9), a speed regulating device and a shutdown protection device are sequentially arranged on the inlet pipeline (7), the steam turbine inlet steam amount is adjusted by adjusting the steam turbine gate opening degree through the speed regulating device, so as to adjust the steam turbine (1) speed, the shutdown protection device is used for protecting the steam turbine (1) when stopping, the exhaust pipeline (8) is at least one, and a motor valve (10) is arranged on each exhaust pipeline (8), and the steam turbine (1), the motor control valve, the speed regulating device, the shutdown protection device and the motor valve (10) are controlled by a DCS system.

2. The governor system of claim 1, wherein: The speed regulating device is a motor regulating valve (11) with a PID control system, the PID control system is arranged between the DCS system and the motor regulating valve (11), is used for electrically regulating the motor regulating valve (11), and the steam turbine (1) speed is adjusted by adjusting the steam turbine gate opening degree and controlling the steam turbine inlet steam amount.

3. The governor system of claim 1, wherein: The shutdown protection device is a steam turbine speed regulator (12), and the model is 2301E.

4. The governor system of claim 1 or 3, wherein: A gear box (3) is arranged between the steam turbine (1) and the water pump (4), the gear box (3) is connected to the steam turbine (1) and the water pump (4), and is used for adjusting the speed and transmitting the torque.

5. The governor system of claim 4, wherein: The suction end (13) and the discharge end (14) of the water pump (4) are respectively connected to an inlet pipeline (15) and an outlet pipeline (16), motor control valves are respectively arranged on the inlet pipeline (15) and the outlet pipeline (16), and the outlet pipeline (16) is connected to the boiler for water supply.

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