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Electrical Power Industry
TETRADOM quantum devices are utilised in a number of thermal power plants.
A thermal power plant is a facility that converts thermal energy into electrical energy. In the steam generation cycle, heat is used to boil water in a large pressure vessel to produce high-pressure steam, which drives the connection to an air compressor. The low-pressure exhaust gas from the air compressor is directed to the steam condenser, where it is cooled to produce hot condensed water, which is then recycled to the heating process to produce more high-pressure steam.
It is primarily the air compressor and condenser that are susceptible to scale and rust.
CASE 1.
Cooling tower and cooling pool:
Cooling pool volume: 1000m3
Circulation flow: 3600m3/h
Cooling tower: L85 fan counterflow cooling tower
Thermal Power Plant
(Yunnan OF CHINA)
Total system water volume: 4000 tons;
Nominal diameter of circulation branch pipe: 600 mm;
Branch pipeline flow: 2000 T/h;
System water supply: 3% of the total water volume, 120 T/h;
Hydration hardness:4mmol/L;
Circulating water inlet temperature: 37℃ in summer, 31℃ in winter
Cooling equipment:
(1) Condenser: Model N-650-1
Cooling area: 650 m2
Water channel: 2 channels 1 process
(2) Medium pressure turbine oil cooler, low pressure turbine oil cooler
(3) Generator air cooler
(4) Online analysis of instrument cooler.
Installation:
In 2006, the 10086KW steam turbine generator set, produced by the German KKK company, was introduced. The circulating cooling water system of the generator set directly uses a TETERADOM quantum ring RI-HCI 10320 instead of the originally planned chemical water treatment method.
The TETERADOM quantum ring was installed on two branch pipes of the circulating cooling water system. It commenced operation in July 2006 and remained in use for a total of 17 months, until November 2007. Production was suspended for four months due to system shutdown and maintenance. The actual working time is 14 months.
Effect of Use：
1. The cooling tower and cooling pool are kept in a highly clean condition. The filler in the tower is free from blockages. The pool wall and surrounding area are free from any bacteria, mud or other attachments. Please be aware that the iron fence of the channel in the pool has been exposed to water and contact with the air for more than one year. There is minimal evidence of corrosion.
2.The cooling effect of the equipment is within the expected parameters. Both the turbine oil temperature and the generator air cooler temperature are within the specified control range. Please find below the monitoring data for the cooling equipment.
The pH range is between 7 and 8.94, which is relatively stable and shows no signs of acidification.
The concentration factor of the circulating cooling water is determined by measuring the c1 content. The supply water value is 17, with a maximum value of 160, a concentration factor of approximately 10, and an average value of 7.13.
As a general rule, the concentration factor of industrial circulating water should be controlled at 2-4. As the concentration factor increases, water can be saved, but scaling and corrosive substances in the circulating water increase, making the system prone to blockages. The TETRADOM quantum ring alters the physical properties of calcium titanate and iron oxide in the water, preventing them from depositing on the pipe wall. This ensures that even when the concentration ratio is very high, the circulation system can still operate as normal.
Summarize
The TETRADOM quantum ring offers three key benefits:
1.Should chemical treatment be employed, the annual purchase cost of SILIPHOS and NIPHOS is estimated at approximately 110,000 USD. The purchase cost of the TETRADOM quantum ring has been reduced by 40%. Furthermore, the product is designed to function for a minimum of three years, with a guaranteed energy supply for the same period. Additionally, only a nominal re-empowerment fee is payable at the end of the guarantee period. No manual maintenance is necessary.
2.By increasing the concentration ratio of circulating water, we can save more than 100,000 tons of water a year.
3.Subsequent drainage pollution is not an issue.
CASE 2.
Thermal Power Plant (JiLin Of China)
The company has an installed capacity of 2*200MW cogeneration units. The steam turbines utilise an open natural ventilation cooling tower circulating water system.
The cooling circulating water volume of a single unit is 30,000 m³/h.
The water level is maintained by a supplementary water source from the above-ground reservoir.
The sewage is treated by the supporting sewage treatment plant and subsequently reused. The quality of the treated water is monitored and controlled using chemical methods. Based on the results of the water quality tests, chemical bactericides and scale inhibitors are added to the circulation system.
Installation
TETRADOM quantum equipment should be installed at the circulating water outlet of the cooling water tower tank.
The quantum immersion devices, which take the form of quantum bars, are fixed in place using a bespoke mounting bracket.
Effect of Use
The trial period will run from 22 June to 6 September 2018, following the installation of TETRADOM quantum devices, the addition of scale inhibitors and rubber balls to the circulating water has been discontinued. It is important to monitor the operational conditions of the condenser, analyse the chemical indicators present in the circulating water, and assess the scaling of the condenser heat pipe, as well as the composition of make-up water.
Please be aware that the trial period will conclude on 4 September 2018, Prior to installation, the maximum terminal difference of the condenser was recorded at 8-9°C. The condenser is severely scaled and the heat exchange tubes are blocked on an annual basis. The system requires a shutdown for cleaning purposes. Following the installation of the aforementioned equipment, there has been an observed increase in the vacuum of the steam turbine during the summer months. We are pleased to report that the scaling phenomenon in the condenser has basically disappeared. An accumulation of soft material has formed on the inner wall of the heat exchange tube. Following analysis, it has been determined that the issue is not caused by scale material. Additionally, the maximum end difference of the condenser is within the acceptable range of 2-3°C.5
Please open the front chamber of the condenser and observe that there is no dirt deposition or corrosion on the inlet end tube sheet and its pipelines. The metallic lustre end face of the heat pipe is clearly visible. Please be advised that a small amount of biological slime has been observed on the outlet end tube plate and its cooling tube. Additionally, metallic surfaces are visible. The slime, formed by bacteria and algae, can be removed by light touch. Following a light touch, a shiny metallic surface is revealed on the inner wall of the pipe. In comparison with the images captured on site during the same period in 2017, there has been a notable enhancement.
Summarize
The water is treated chemically, and by adding scale inhibitors to the circulating water, we are able to maintain a low conductivity, below 400us/cm. The conductivity of the supplementary water is also very low. It is recommended that the hardness of the circulating water be reduced. Once the quantum water processor is installed, the original internal scale is reduced, which increases the conductivity of the circulating water and the supplementary water. However, the high-hardness water does not scale, and the system continues to operate normally. This effect is much more effective han chemical descaling methods.
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