WOODWARD 9904-801

الوصف

The WOODWARD 9904-801 is a mechanical-hydraulic speed droop governor specifically designed for steam turbines. It is a part of the TG-17S (Screw) series, known for its robust mechanical operation and precise screw-based speed adjustment.

WOODWARD 9904-801: Mechanical-Hydraulic Speed Droop Governor (TG-17S, 2400 rpm, CCW Rotation)

The WOODWARD 9904-801 is a self-contained, mechanical-hydraulic control device that plays a crucial role in maintaining stable operation of small to medium-sized steam turbines. It’s well-suited for applications where consistent speed control with a predictable droop characteristic is required, as opposed to strict isochronous (constant) speed.

Product Overview

The 9904-801 continuously monitors the turbine’s rotational speed and precisely adjusts the steam admission valve to control the turbine’s speed based on the speed droop principle.

• Product Type: Mechanical-Hydraulic Speed Droop Governor
• Manufacturer: Woodward
• Series: TG-17S (Screw-operated)
• Application: Small to medium steam turbines (e.g., driving pumps, compressors, generators).
• Key Feature: Speed droop control (not isochronous).
• Rated Speed: Designed for operation at 2400 rpm.
• Speed Setting Mechanism: Screw-operated (for fine, manual adjustment).
• Drive Shaft Rotation: Counterclockwise (CCW) rotation.
• Output: 16 N·m (12 ft-lb) rotary output.
• Environmental Certification: ATEX certified (suitable for potentially explosive atmospheres).
• Rated Speed @ 2° Droop: 2010 rpm (a specific configuration point for droop, indicating the speed reduction for a given load increase).
• Material: Often features Stainless Steel components for enhanced corrosion resistance (common within this TG-17S range).

Detailed Product Description

The WOODWARD 9904-801 offers a reliable and cost-effective solution for steam turbine speed control. It’s a key member of the durable and widely recognized TG-17 governor family.

Here’s a breakdown of its functionality and features:

• Mechanical-Hydraulic Operation: This governor is a fully self-contained unit. It uses a drive shaft-driven ball head assembly to accurately sense the turbine’s speed. An internal, shaft-driven oil pump generates the necessary hydraulic pressure to power the internal servomotor, which precisely controls the turbine’s steam admission valve. This robust mechanical-hydraulic design minimizes reliance on external electronic components for its core function.
• Speed Droop Control: The 9904-801 operates on the speed droop principle. This means that as the load on the turbine increases, its speed will slightly decrease in proportion to that load. This characteristic is often desirable in applications that involve load sharing among multiple prime movers or where a slight, predictable speed variation due to load changes is acceptable.
• Direct Turbine Interface: The governor is designed for direct coupling to the steam turbine’s rotor or an auxiliary shaft to receive speed input. Its rotary output shaft then directly connects to the turbine’s steam admission valve, enabling precise regulation of steam flow.
• 2400 rpm Capability: This specific model is optimally configured for turbines operating around a nominal speed of 2400 rpm. This speed capability is vital for ensuring proper integration and performance with the prime mover.
• Screw-Operated Speed Setting: The “S” in TG-17S indicates that the speed setpoint is adjusted via a screw mechanism. This method provides fine, stable, and precise adjustment of the desired turbine speed, making it suitable for applications that don’t require frequent or rapid speed changes.
• Counterclockwise (CCW) Rotation: The 9904-801 specifically features a counterclockwise drive shaft rotation and a corresponding counterclockwise output shaft rotation. This is a critical mechanical specification that ensures correct integration with the turbine’s drive train.
• Rugged and ATEX Certified: Built for challenging industrial environments, these governors feature a rugged construction and a self-contained oil sump. The ATEX certification confirms its suitability for use in potentially explosive atmospheres, commonly found in many industrial plants. Additionally, models in this series, like the 9904-801, often incorporate stainless steel components for enhanced corrosion resistance.
• Work Capacity: The governor’s output terminal shaft delivers a substantial 16 N·m (12 ft-lb) of rotary work capacity, which is sufficient for operating various types of turbine governor valves.

In summary, the 9904-801 is a reliable, robust, and ATEX-certified mechanical-hydraulic governor, ideally suited for steam turbine applications operating around 2400 rpm that require precise screw-based speed adjustment and a counterclockwise drive shaft rotation.

Technical Specifications (General)

Typical Applications

The WOODWARD 9904-801 is commonly found in industrial settings utilizing small to medium steam turbines for mechanical drive or power generation, especially in situations where:

• Speeds are around 2400 rpm: Ideal for turbines operating within this speed range.
• Speed Droop Control is Adequate: For applications where load sharing or slight speed variation with load changes is acceptable.
• Mechanical-Hydraulic Simplicity is Preferred: When a robust, self-contained mechanical governor is favored over more complex electronic systems.
• Precise, Infrequent Speed Adjustment: Where the screw-based speed setting offers sufficient control.
• Counterclockwise Rotation: The turbine’s mechanical drive interface specifically requires a CCW rotating governor.
• Common Use Cases Include:
  • Pumps: Controlling steam turbines that drive various process pumps.
  • Compressors/Turboexpanders: Regulating the speed of steam turbines used to drive compressors in chemical plants, refineries, or gas processing facilities.
  • Generators: Controlling the speed of steam turbines connected to generators for power generation, often in parallel with other power sources.
  • Fans: Managing steam turbines that power large industrial fans in power plants or other heavy industries.