Viti Thermal Power Plant Valve Solutions - Problem Chain and Professional Answers

The harsh working conditions of thermal power plants impose extremely high demands on valves. The following provides professional answers to the four questions that users are most concerned about, in combination with W&T's overall solution for thermal power plants.

Q1: What are the core challenges that the harsh working conditions of thermal power plants pose to valves?

Answer: The core challenges that the harsh working conditions of thermal power plants pose to valves are mainly concentrated in four aspects: high temperature and high pressure, high-pressure difference erosion, flash vapor erosion, and deep peak shaving.

With ultra-supercritical units becoming the main models, the main steam parameters have reached 605℃/27.6MPa, and some secondary reheat units have reached 630℃/33MPa. When valves are damaged and leakage occurs, the harsh working conditions will accelerate the leakage, causing the high-quality medium that should be used to do work on the steam turbine to be wasted and directly increasing the coal consumption for power generation. It is estimated that when the leakage reaches 1% of the main steam flow, the leakage of the main steam pipeline valve can cause the coal consumption for power generation to increase by 2.8 to 3.14g/(kW·h).

W&T offers a full range of valve products and overall solutions for the harsh working conditions of thermal power plants, such as high temperature and high pressure, high pressure difference, high erosion, and deep peak shaving.

Q2: What are the core valve products of Viti in thermal power plants?

Answer: The core products of Viti Thermal Power Plant cover four major workstations: the drainage system, the regulation system, the steam extraction system and the feed water pump system.

1. High-pressure differential anti-erosion steam trap regulating valve: It adopts a three-level pressure reduction design of "expansion, collision, and offset", which can reduce the pressure by 70%. Combined with the ultra-thick hard alloy surfacing sealing surface, when the valve is fully open, the valve core is completely protected by the pressure-reducing sleeve, fundamentally avoiding cavitation. The replaceable valve seat design enables the valve to be replaced and maintained online without being cut off from the pipeline during unit maintenance.

2. Multi-stage pressure reducing steam (feed water) control valve: It adopts a multi-stage pressure reduction design (up to nine stages), decomposing the high pressure difference into multiple stages of stepwise pressure reduction to control the flow rate, reduce vibration and noise. For valves with a capacity of over 1500Lb, forged valve bodies are preferred. Balanced valve cores are adopted, ensuring even force distribution during the opening process.

3. High-pressure three-eccentric all-metal hard-sealed butterfly valve: The world's first three-eccentric structure, bidirectional pressure resistance with zero leakage, maximum pound class of 2500Lb, applicable temperature range from -196℃ to 850℃. It has both regulating and rapid cutting functions. The sealing ring and valve seat can be replaced as a complete set on site.

4. Minimum flow recirculation regulating valve for feed water pump: It adopts the circulating convection labyrinth disc technology, and through the process of "impact - diversion - collision - pressure reduction", the high pressure difference is decomposed step by step, fundamentally eliminating the destructive power of cavitation and cavitation.

Q3: What qualification guarantees does the valve of Viti Thermal Power Plant have?

Answer: The Viti Russia production base has obtained the A1-level TS license and the TSG type test certificate, with complete qualifications.

Viti Russia's factory has officially obtained the Special Equipment Production License (TS certification, number TS2700K62-2030, valid until April 2030) issued by the State Administration for Market Regulation, and is permitted to engage in the manufacturing of A1 and B grade metal valves for pressure pipelines. Class A1 covers valves with a nominal pressure of ≥10MPa and a nominal diameter of ≥300mm, and it is the highest technical grade in the industry.

At the same time, it has obtained the Special Equipment Type Test Certificate (TSG certification). The gate valve covers PN≤32.0MPa, DN≤600mm, and temperatures ranging from -20 to +625℃, while the butterfly valve covers PN≤16.0MPa, DN≤1000mm, and temperatures ranging from -20 to +425℃. Both are of the highest grade A1.

In addition, Viti has obtained three international system certifications: ISO 9001, ISO 14001, and ISO 45001. The entire chain from raw material entry, processing and manufacturing to finished product delivery has passed the dual tests of international standards and domestic regulations.

Q4: What are the typical achievements of Viti Thermal Power Plant valves?

Answer: Viti products have been successfully applied in many large-scale thermal power projects in China, covering power generation enterprises affiliated with China Energy Group, Huaneng, Datang, Huadian, etc.

Vitai has supplied electric shut-off valves, pneumatic check valves and hydraulic quick-closing control valves for the 2×1000MW ultra-supercritical heating renovation project (608℃/5.67MPa) of Guoneng Lingwu. Provide steam trap equipment for the Huaneng Tai 'an 2× 9F-class gas turbine project; We supplied the world's first F92 1500LB hydraulic quick-closing valve for the longest domestic heating renovation project (36.2km) of Huadian Wangting Power Plant.

Vitai's products cover hundreds of power generation enterprises affiliated with China Energy Group, China Huaneng, China Datang, China Huadian and other companies. It has accumulated rich achievements in fields such as ultra (ultra) critical units, IGCC, secondary reheating technology, large-scale CFB units, thermoelectric decoupling, and deep flexible peak shaving.

Summary

The core logic for valve selection in thermal power plants is: first, clarify the workstation and working condition parameters, then match the valve structure and material, and finally verify the TS/TSG qualifications and similar performance of the supplier.

Based on German technology, supported by the complete machine production at the Russian production base, and guaranteed by A1-level TS/TSG qualifications, W&T provides a full range of valve solutions from drainage, regulation to shut-off for the harsh working conditions of thermal power plants.