**Abstract:**
This paper presents an improved design for a marine steam turbine circulating pump, addressing several existing issues in its performance and reliability. The enhanced pump has undergone rigorous land-based testing and sea trials, confirming that it meets all the expected performance targets. The improvements focus on enhancing control systems, optimizing cooling efficiency, and improving mechanical components to ensure smoother operation and longer service life.
**Classification: TK264.1 | Document code: A**
**Article ID: 1001-2060 (2000) 02-0137-03**
**Improved Design of a Marine Steam Turbine Circulating Pump**
Qiu Zufa, Gao Lei, Qin Xiaocheng
(Harbin No.703 Research Institute)
**Abstract:**
The design and manufacturing process of a marine steam turbine circulating pump have been optimized to address multiple operational challenges. Following the implementation of these improvements, the pump was tested both on land and at sea, and its performance fully met the intended design objectives.
**Keywords:** turbine circulating pump, improvement, design
**1. Introduction**
A marine steam turbine circulating pump is typically composed of three main parts: the steam turbine, the reducer, and the circulating pump itself. The turbine, connected through the reducer, drives the pump to draw seawater into the main condenser and the host oil cooler, aiding in the cooling of the working fluid. In case of damage or leakage in the furnace chamber, the pump also functions as an emergency drainage system, removing accumulated water from the cabin.
The turbine consists of a rotor with blades and a housing containing nozzles, quick-closing valves, auxiliary valves, diaphragms, seals, and bearings. The reducer includes a rotor with gears and measuring devices, along with bearings and an oil cooler. The circulating pump features a rotor with a pump wheel and a housing divided into two halves for easier maintenance.
**2. Proposed Improvements**
Several key areas were identified for enhancement:
2.1 **Control Valve System**: The original speed control valve was replaced with an electric control valve to improve automation. This allows for more precise regulation of steam flow, reducing manual intervention and increasing operational efficiency.
2.2 **Oil Cooler Heat Pipe Issues**: The heat exchanger tubes in the oil cooler were prone to damage due to improper handling and corrosion. A new production and installation protocol was implemented to prevent such failures.
2.3 **Rubber Bearings**: The original rubber bearings had poor adhesion to copper castings, resulting in low yield. Improved casting techniques and bonding methods increased the pass rate significantly.
2.4 **Oil Supply Problem**: Insufficient oil supply to the upper bearing caused overheating. By increasing the diameter of the oil supply pipe, the issue was resolved, ensuring stable operation.
2.5 **Vibration Issues**: Resonance at certain speeds led to excessive vibration. Detailed analysis and design adjustments helped mitigate this problem.
2.6 **Electric Oil Pump Addition**: An electric oil pump was added to support the unit during start-up and shutdown, improving overall reliability.
2.7 **General Manufacturing Enhancements**: Several manufacturing processes were refined to further improve the performance and durability of the pump.
**3. Implementation of the Improved Design**
3.1 **Electric Control Valve**: A newly designed electric control valve was introduced, allowing for automated and precise regulation of steam intake. This significantly improved the pump’s ability to handle different operating conditions, including reversing.
3.2 **Heat Pipe Solutions**: Proper handling, installation, and sealing techniques were enforced to prevent tube damage and detachment, ensuring long-term reliability.
3.3 **Rubber Bearing Optimization**: Centrifugal casting and advanced bonding technology were used to enhance the quality and performance of the bearings, increasing the pass rate to over 90%.
3.4 **Oil Supply Enhancement**: The oil supply line was upgraded, solving the overheating issue and ensuring consistent lubrication.
3.5 **Vibration Reduction**: The critical speed of the turbine rotor was recalculated, and necessary design changes were made to reduce vibration and improve stability.
Overall, the improved design of the marine steam turbine circulating pump demonstrates significant advancements in performance, reliability, and ease of maintenance, making it a more efficient and durable solution for maritime applications.
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