Novel steam-electricity combined dragging device

Abstract

The utility model relates to a novel steam-electricity combined dragging device, and belongs to application of steam turbine dragging transmission equipment. The device comprises a steam turbine, a feed pump, a motor, a first coupler and a second coupler, the feed pump adopts a lengthened pump shaft, the motor is connected with the feed pump through the first coupler, and the feed pump is connected with the steam turbine through the second coupler. The whole structural design is reasonable, the operation safety of the boiler feed pump can be greatly improved through transformation, the risk is reduced, meanwhile, the flow of an original gas-making low-pressure steam pipe network is automatically compensated, operation is simplified, the steam utilization rate is increased, and the use requirement is met.

Description

Technical Field

[0001] The utility model relates to a traction device, in particular to a novel steam-electric combined traction device, which belongs to the application of steam turbine traction transmission equipment. It relates to a steam turbine (back pressure type) traction feed water pump, which is not able to operate normally due to insufficient work of the steam turbine caused by unstable use of steam in the subsequent process. Background Art

[0002] The boiler feedwater pumps for the three-waste co-firing furnaces in our company's power plant are powered by B1.6-0.98 / 0.245 steam turbines, which deliver boiler water. The B1.6-0.98 / 0.245 turbines are supplied with steam from a 0.6 MPa steam network. Steam is back-pressurized to a low-pressure 0.20 MPa through the turbine, and then supplied through the steam network to the gasification process in the synthetic ammonia plant. Due to the intermittent steam usage in the gasification process, the steam flow rate of the B1.6-0.98 / 0.245 turbines in the power plant is unstable. They operate in the 2500-2600 rpm range for extended periods, failing to reach their rated speed of 2980 rpm. This results in significant fluctuations in the feedwater pump's feedwater pressure, hindering water delivery to the boiler and posing risks to boiler safety.

[0003] In order to improve steam utilization and stabilize the safe operation of the water feed pump, the original pump shaft was replaced and the pump head was extended to match the coupling and the same power motor (250KW) for driving. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a new steam-electric combined traction device with a safe and reasonable structural design, which improves steam utilization and stabilizes the safe operation of the water feed pump.

[0005] The technical solution adopted by the present invention to solve the above problems is: the new steam-electric combined traction device includes a steam turbine and a feed water pump, and the feed water pump adopts an extended pump shaft. It is characterized in that it also includes an electric motor, a coupling 1 and a coupling 2. The electric motor and the feed water pump are connected through the coupling 1, and the feed water pump and the steam turbine are connected through the coupling 2.

[0006] Preferably, the present invention also includes a gearbox for adjusting the rotation speed of the turbine to an appropriate speed. The gearbox includes an input shaft, an output shaft and a speed gear set. The output shaft and the input shaft rotate independently under the transmission of the speed gear set, and a series of speed gears are arranged in the speed gear set.

[0007] Preferably, the turbine rotor of the present invention is connected to the input shaft of the gearbox by a gear coupling or other types of couplings.

[0008] Preferably, the center lines of the three axes of the steam turbine, the pump shaft of the water feed pump and the electric motor of the utility model are on the same straight line.

[0009] Compared with the existing technology, this utility model has the following advantages and effects: the overall structural design is reasonable, and the operation safety of the boiler feed water pump can be greatly improved and the risk can be reduced through transformation. At the same time, the flow of the original gasification low-pressure steam pipeline is automatically compensated to simplify the operation and improve the steam utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0011] In the figure: steam turbine 1, feed water pump 2, electric motor 3, coupling 1 4, coupling 2 5, gearbox 6. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0013] Example

[0014] See also Figure 1 The novel steam-electric combined traction device of this embodiment includes a steam turbine 1, a feed water pump 2, an electric motor 3, a coupling 1 4 and a coupling 2 5. The feed water pump 2 adopts an extended pump shaft. The electric motor 3 is connected to the feed water pump 2 through a coupling 1 4, and the feed water pump 2 is connected to the steam turbine 1 through a coupling 2 5.

[0015] In this embodiment, the gearbox 6 is a device that adjusts the rotation speed of the steam turbine to an appropriate speed. The gearbox 6 consists of an input shaft, an output shaft, a speed-changing gear set, bearings, and seals. The input shaft is connected to the rotor end of the steam turbine 1, and the output shaft is connected to the generator or directly drives other equipment. The speed-changing gear set includes a series of speed-changing gears, and the speed of the steam turbine 1 is adjusted by cooperating with gears of different tooth numbers.

[0016] In this embodiment, the rotor of the steam turbine 1 and the input shaft of the gearbox 6 are connected by a gear coupling or other types of couplings.

[0017] In this embodiment, the center lines of the steam turbine 1, the pump shaft of the feed water pump 2 and the motor 3 are on the same straight line.

[0018] The transformation of this embodiment includes the following steps: (1) installing an electric motor 3 at the rear of the pump on the basis of the original one, replacing the original pump shaft and extending the pump head to match the coupling and the same power electric motor (250KW) for dragging; (2) modifying the pump shaft of the water feed pump 2, lengthening the pump shaft and installing a coupling; (3) adding a motor foundation on the pump head side of the original water feed pump and installing the synchronous motor 3; (4) the three-axis installation accuracy of the motor 3 shaft center, the water feed pump 2 shaft and the steam turbine 1 is high, and the radial runout deviation of the pump shaft and the motor 3, and the pump shaft and the steam turbine 1 is required to be less than 0.03mm; (5) starting the equipment according to the normal start-up procedures.

[0019] The current operating status of the equipment in this embodiment is as follows: after the steam turbine 1, feed water pump 2 and motor 3 are jointly driven, the feed water pump 2 relies on the fixed power output of the motor 3 to stabilize the rotation speed of the feed water pump 2 to ensure the feed water pressure of the feed water pump. When the steam turbine 1 is running, the flow rate is automatically adjusted according to the steam production consumption of the gasification process, thereby reducing the operating load of the motor 3; thus achieving the purpose of improving steam utilization and safe operation of the feed water pump 2.

[0020] Through the above description, those skilled in the art can already implement it.

[0021] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is merely an example of the structure of the utility model. Any equivalent changes or simple changes made based on the structure, features and principles described in the concept of the utility model patent are included in the scope of protection of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should fall within the scope of protection of the utility model.

Claims

1. A novel steam-electric combined drive device, comprising a steam turbine (1) and a feed water pump (2), wherein the feed water pump (2) adopts an extended pump shaft, and is characterized in that: It also includes an electric motor (3), a coupling 1 (4) and a coupling 2 (5), wherein the electric motor (3) is connected to the feed water pump (2) via the coupling 1 (4), and the feed water pump (2) is connected to the steam turbine (1) via the coupling 2 (5).

2. The novel steam-electric combined traction device according to claim 1 is characterized in that: The invention also includes a gearbox (6) for adjusting the rotation speed of the steam turbine to an appropriate rotation speed. The gearbox (6) includes an input shaft, an output shaft and a speed-changing gear set. The output shaft and the input shaft rotate independently under the transmission of the speed-changing gear set. A series of speed-changing gears are arranged in the speed-changing gear set.

3. The novel steam-electric combined traction device according to claim 2 is characterized in that: The turbine (1) rotor and the input shaft of the gearbox (6) are connected by a gear coupling.

4. The novel steam-electric combined traction device according to claim 1 is characterized in that: The center lines of the three axes of the steam turbine (1), the pump shaft of the feed water pump (2) and the electric motor (3) are on the same straight line.

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