Manufacturer of Turbine Components
Manufactures various types of steam turbines ranging from 5MW - 50MW,including condensing, backpressure, and extraction-condensing designs
Condenser
Condensers serve as core auxiliary equipment in thermal power systems (particularly in thermal power plants and steam turbine power units).
Category:
Condenser
key word:
Condenser Model
Serial Number | Condenser Model | Cooling area | Note |
1 | N-280 | 280㎡ | 3MW |
2 | N-560 | 560㎡ |
|
3 | N-800 | 800㎡ |
|
4 | N-1000 | 1000m³ | 12MW |
5 | N-1250 | 1250㎡ | S9MW |
6 | N-1400 | 1400㎡ | 15MW |
7 | N-1600 | 1600㎡ |
|
8 | N-2000 | 2000m³ | 25MW、30MW |
9 | N-2200 | 2200㎡ | 25MW、30MW |
10 | N-2400 | 2400㎡ | 25MW、30MW |
11 | N-3500 | 3500㎡ | 50MW、60MW |
12 | N-3800 | 3800㎡ | 50MW、60MW |
Condensers serve as core auxiliary equipment in thermal power systems (particularly in thermal power plants and steam turbine power units). Their primary function is to condense low-pressure exhaust steam from turbines into water (known as “condensate”) while establishing and maintaining a high vacuum environment at the turbine exhaust port. This reduces exhaust steam losses and enhances the overall efficiency of the thermal cycle.
I. Core Principles and Structure of Condensers
1. Working Principle
Based on the synergistic effects of “phase change heat transfer” and “vacuum extraction”:
1.1 Steam Condensation: Low-pressure exhaust steam from the turbine (temperature approx. 30-60°C, pressure below atmospheric) enters the “steam side space” of the condenser, where it contacts internal cooling water tubes.
2. Heat Exchange: Circulating cooling water (e.g., river water, seawater, or cooling tower return water) flows through the cooling water tubes. The exhaust steam releases heat to the cooling water, rapidly condensing into water (condensate) with a drastic volume reduction (approximately 1 volume of steam condenses into 1/1600 volume of water).
3. Vacuum Establishment: The sudden volume reduction of steam creates negative pressure in the steam-side space. A vacuum pump (or water jet ejector) then extracts any entrained air and non-condensable gases, maintaining high vacuum at the turbine exhaust port (typically >90% vacuum). This reduces turbine exhaust backpressure and enhances power generation efficiency.
2. Core Structure
Structural Components
Shell: Typically a cylindrical or square steel plate welded structure, separating the “steam side” (carrying exhaust steam) and the “water side” (carrying cooling water).
Cooling Water Tube Bundle: The core heat transfer element, usually composed of copper alloy tubes (e.g., brass, white bronze) or titanium tubes (corrosion-resistant, used for seawater cooling), arranged in bundles.
Tube Sheets: Located at both ends of the shell, securing the cooling water tubes to ensure complete separation between the steam and water sides, preventing mixing of cooling water and condensate.
Water Chambers: Enclosed spaces outside the tube sheets, divided into “inlet chamber” and “outlet chamber,” guiding cooling water flow within the tubes (typically “two-pass” or “multi-pass”).
Condensate Collection Zone: Located at the bottom of the condenser (“hot well”), collecting condensed water for return to the boiler via condensate pumps for reuse.
Extraction Port: Typically located in the “air accumulation zone” of the steam-side space (e.g., top or sides), connected to a vacuum pump to extract non-condensable gases.
II. Key Technical Parameters of Condensers
Technical parameters directly determine the performance and compatibility of condensers, requiring matching with steam turbines and circulating water systems. Core parameters include:
Parameter Category | Key Parameters | Definition and Impact |
Thermal Performance | Cooling Area | Total heat transfer area of cooling water tubes (m²). This is the core dimension of the condenser and must match the turbine exhaust steam flow rate. |
Vacuum Level/Exhaust Backpressure | Vacuum level in the steam-side space (kPa). Lower backpressure enhances turbine efficiency (typically designed <5 kPa). | |
Condensate Subcooling | Temperature difference between condensate and saturated vapor at corresponding pressure (℃). Normally <2℃; excessive subcooling increases heat loss. | |
Heat transfer coefficient (K) | Heat transfer rate per unit area and temperature difference (W/(m²·℃)). Higher K values indicate better heat transfer efficiency. | |
Fluid Parameters | Circulating Water Flow Rate | Cooling water volume passing through the cooling pipes per unit time (m³/h). Insufficient flow may cause vacuum drop. |
Cooling Water Temperature Difference | Temperature difference between cooling water inlet and outlet (°C). Normal range is 5-10°C. Excessive temperature difference indicates overloaded heat exchange. | |
Turbine exhaust steam flow rate | Exhaust steam entering the condenser per unit time (t/h), serving as the core basis for condenser design. | |
Structure and Materials | Cooling Water Tube Material | Copper alloy tubes (cost-effective, suitable for freshwater), titanium tubes (corrosion-resistant, suitable for seawater or high-turbidity water). |
Tube Sheet Material | Typically carbon steel (freshwater) or stainless steel (seawater), must match tube material to prevent electrochemical corrosion. | |
Hydraulic Resistance | Pressure loss (kPa) incurred by cooling water flowing through the tubes. Excessive hydraulic resistance increases circulating pump energy consumption. |
III. Common Condenser Failures and Solutions
Condenser failures directly cause vacuum drop and deterioration of condensate quality, thereby affecting turbine output and safe operation. Common failures include:
1. Vacuum Drop (Most Common Failure)
1. Causes:
Circulating water system abnormalities: Insufficient circulating water flow (e.g., circulating water pump failure, filter screen blockage), excessively high circulating water temperature (e.g., low cooling tower efficiency, high ambient temperature).
Increased non-condensable gases: Vacuum pump failure (e.g., insufficient vacuum pump water level, motor failure), air leaks in the steam-side system (e.g., aged flange gaskets, weld seam leakage).
Reduced heat transfer efficiency: Scale buildup in cooling pipes (due to poor water quality causing calcium/magnesium ion deposits), pipe blockages (caused by debris or biological slime).
2. Remedial Actions:
Inspect circulating water system: Clean circulating water pump filters, repair pump failures. If temperature is high, increase cooling tower makeup water or clean cooling tower packing.
Locate leaks: Use “helium mass spectrometry leak detection” or “water injection leak detection” to pinpoint steam-side leaks. Replace gaskets and repair welds.
Clean heat exchange tubes: Employ “high-pressure water jet cleaning” (to remove scale), “chemical cleaning” (acid washing for descaling, requiring concentration control), or “rubber ball cleaning” (online cleaning to prevent scaling).
2. Condensate Water Quality Non-Compliance
1. Causes:
Cooling water pipe leakage: Pipe corrosion perforation (e.g., electrochemical corrosion, scouring corrosion), loose tube sheet-to-pipe connections allowing cooling water (containing impurities, chloride ions) to infiltrate condensate.
Condenser steam-side contamination: Steam leakage from turbine shaft seals (containing oil contamination), impurities introduced from the boiler feedwater system.
2. Remedial Actions:
Locate leaking tubes: Identify leaks via “condensate hardness testing” (hardness spikes during leaks), “eddy current testing,” or “helium leak detection.” Address with “tube plugging” (sealing leaks with copper plugs, ensuring plugging rate <5%) or tube replacement.
Cleaning steam-side contamination: Inspect turbine shaft seal system, adjust seal steam supply pressure, replace shaft seal components; flush condensate system.
3. Cooling water pipe damage (corrosion, fracture)
1. Failure causes:
Electrochemical corrosion: Dissimilar materials between tube sheet and water pipes (e.g., carbon steel tube sheet + copper water pipes) form galvanic cells in water, causing pipe corrosion.
Erosion corrosion: Excessive circulating water flow or debris inside pipes causes localized abrasion of the inner pipe walls.
Biofouling corrosion: Microorganisms (e.g., algae, bacteria) in cooling water attach to pipe walls and secrete acidic substances that corrode the pipes.
2. Remedial Measures:
● Corrosion-resistant retrofit: Replace with corrosion-resistant materials (e.g., titanium pipes) or apply anti-corrosion coatings (e.g., epoxy resin) to the tube sheet surface.
● Flow control: Adjust circulation flow rates to prevent operation exceeding design limits; install fine filters at water inlets to prevent debris ingress;
● Biological control: Regularly add biocides (e.g., sodium hypochlorite) to the circulation system to inhibit microbial growth.
4. Excessive condensate subcooling
1. Causes:
Air accumulation on the steam side: Non-condensable gases form a “gas film” on tube walls, hindering heat transfer and lowering condensate temperature.
Improper cooling water tube arrangement: Overly dense tube bundles cause condensate to linger in the hot well, leading to further cooling.
Excessive circulating water flow: Cooling water carries away too much heat, resulting in condensate temperatures below saturation.
2. Remedial Actions:
Enhance Evacuation: Inspect vacuum pump operation, clear blockages at exhaust ports to ensure timely removal of non-condensable gases.
Optimize Structure: If design-related, adjust water tube bundle spacing to reduce excessive condensate cooling.
Adjust Flow Rate: Appropriately reduce circulating water flow based on turbine load to prevent overcooling.
IV. Key Points for Daily Condenser Maintenance
1. Regularly monitor parameters: Continuously track vacuum level, condensate hardness, subcooling, and circulating water inlet/outlet temperature differential. Promptly investigate any anomalies.
2. Clean heat exchange tubes: Conduct rubber ball online cleaning every 3-6 months based on water quality, and perform offline high-pressure water cleaning or chemical cleaning annually.
3. Seal and Leak Inspection: Inspect steam-side flange gaskets and tube sheet-water tube connections every six months. Repair leaks promptly upon detection.
4. Vacuum Pump Maintenance: Regularly replenish vacuum pump working fluid (e.g., water for water-ring vacuum pumps), remove internal impurities, and inspect motor insulation.
5. Water Quality Management: Control circulating water parameters (e.g., pH, hardness, chloride ion concentration). Regularly add corrosion inhibitors and scale inhibitors to prevent scaling and corrosion.
Through proper design, standardized operation, and regular maintenance, the condenser can achieve long-term stable operation, ensuring the efficiency and safety of the thermal system.
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A production-oriented enterprise specializing in the processing, production, and research and development of steam turbine components