In the flue gas desulfurization system of a power plant, accurate temperature monitoring is one of the key factors to ensure the stable and efficient operation of the system. As a high-precision temperature measurement device, WRE2-291 thermocouple plays an indispensable role in the temperature monitoring of the desulfurization system of a power plant, and effectively protects the entire flue gas desulfurization system.

I. Overview of flue gas desulfurization system and the importance of temperature monitoring

Flue gas desulfurization system is mainly used to remove sulfur dioxide from flue gas produced by burning fossil fuels in power plants to reduce pollution to the environment. Common desulfurization technologies include limestone-gypsum method, furnace calcium injection tail humidification activation method, etc. In these desulfurization processes, many chemical reactions are sensitive to temperature.

For example, in the limestone-gypsum method, the reaction between limestone slurry and sulfur dioxide in flue gas needs to be carried out within a specific temperature range. Too high temperature will reduce the solubility of limestone, affecting the reaction rate and desulfurization efficiency; too low temperature may make calcium sulfite in the slurry easy to crystallize and precipitate, blocking pipelines and equipment, and increasing the maintenance cost of equipment. In addition, the equipment and pipelines in the desulfurization system will have different physical and chemical properties under different temperature environments. Sudden temperature changes may cause thermal stress deformation of the equipment, and in severe cases, damage to the equipment.

II. Characteristics and principles of WRE2-291 thermocouple

(I) Characteristics

1. High accuracy

The WRE2-291 thermocouple can accurately measure the temperature in the desulfurization system with an accuracy of [X] degrees Celsius, which helps to accurately grasp the temperature state in the system.

2. Good stability

It has good chemical stability and can work stably for a long time in the complex chemical environment of the desulfurization system, and is not easily affected by corrosion.

3. Wide measurement range

The temperature of [specific temperature range] can be measured to meet the different temperature monitoring needs of various parts of the desulfurization system.

(II) Principle

Thermocouples work based on the Seebeck effect principle. When there is a temperature difference in a closed loop composed of two different conductors or semiconductors, an electromotive force will be generated in the loop. The WRE2-291 thermocouple uses a thermocouple wire composed of nickel-chromium-copper-nickel (nickel-chromium-constantan) material to accurately measure temperature changes in the desulfurization system.

III. Specific protective role in the desulfurization system

(I) Reaction temperature control

1. Limestone slurry reaction tank

In the limestone slurry reaction tank, the WRE2-291 thermocouple monitors the temperature in real time. If the temperature deviates from the optimal reaction temperature (usually in [temperature range]), the control system can adjust the cooling water volume or heating device (if any) to restore the temperature to the normal range to ensure that the reaction between limestone and sulfur dioxide can proceed efficiently and ensure the desulfurization efficiency.

2. Gypsum crystallization process

In the gypsum crystallization process, the right temperature is the key to forming high-quality gypsum crystals and no large amount of gypsum scale. After the thermocouple monitors the temperature change, it can control the water temperature and other related parameters of the crystallizer to prevent gypsum quality problems caused by abnormal temperature.

(II) Equipment protection

1. Protection of pipelines and valves

There are a large number of slurry pipelines and valves in the desulfurization system. When the WRE2-291 thermocouple detects a sudden change in temperature, such as a sharp rise or fall in temperature due to a sudden flow change or external interference, the operator can take timely measures, such as reducing the fluid flow rate or insulating the affected pipeline, to prevent the pipeline and valve from rupture or damage due to thermal stress.

2. Protection of corrosion-resistant equipment

Many equipment in the desulfurization system, such as absorption towers, oxidation fans, etc., need to maintain good corrosion resistance at a specific temperature. The temperature data monitored by the thermocouple can help control the operating parameters of the equipment to avoid aggravated equipment corrosion due to excessively high or low temperatures.

(III) Prevent scaling and blockage

1. Pipeline scaling monitoring

By monitoring the temperature distribution in the pipeline, the thermocouple can detect scaling precursors that may be caused by temperature changes. For example, in areas prone to scaling such as elbows and valves, if the temperature fluctuates abnormally, it may mean that the substances in the slurry begin to deposit and scale in these areas, so they can be cleaned in time.

2. Inlet flue gas temperature monitoring

For the flue gas entering the desulfurization system, if its temperature is too high, it may carry a lot of dust, increase the burden on the system, and may also cause scaling at the outlet of the absorption tower. The monitoring of the inlet flue gas temperature by the WRE2-291 thermocouple helps to take measures to cool the flue gas for pretreatment and reduce the risk of scaling and blockage.

IV. Fault diagnosis and early warning

The WRE2-291 thermocouple can also be used as an important tool for fault diagnosis. If the temperature of a certain monitoring point continues to be abnormal, it may indicate that there is a problem with the equipment or pipeline in that part, such as leakage, internal scaling or heat exchanger failure. It can send early warning signals to the control system in time, so that operators can quickly take measures to repair and avoid further expansion of the problem.
When looking for high-quality, reliable thermocouples, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229