1： Application and advantages of rotary film thermal deaerator

The rotary film thermal deaerator is a type of thermal deaerator, which is one of the key equipment in boilers and heating systems. The serious losses caused by corrosion of boiler feedwater pipelines, economizers, and other ancillary equipment due to oxygen corrosion every year have attracted increasing attention from the Ministry of Electric Power of China. Therefore, the Ministry of Electric Power has issued GB1576-2001 "Industrial Boiler Water Quality Standards" and "Safety Technical Supervision Regulations for Power Plant Deaerators", proposing departmental standards for the oxygen content of deaerators, that is, the oxygen content of low-pressure deaerator feedwater should be less than 15 цɡ/L, and the oxygen content of high-pressure deaerator feedwater should be less than 7 цɡ/L.

Deoxygenation is a crucial step in the process of boiler feedwater treatment Oxygen is the main corrosive substance in the water supply system and boiler. The oxygen in the water supply should be quickly removed, otherwise it will corrode the water supply system and components of the boiler. The corrosion product, iron oxide, will enter the boiler, deposit or adhere to the boiler tube wall and heating surface, forming iron scale with poor heat transfer. Moreover, corrosion can cause pitting on the inner wall of the pipeline, increase the resistance coefficient, and even lead to pipeline explosion accidents when the pipeline is severely corroded According to national regulations, steam boilers with an evaporation capacity of 2 tons per hour or more and hot water boilers with a water temperature of 95 ℃ or more must be deoxygenated.

The rotary film thermal deaerator has the following advantages:

1: High deoxygenation efficiency.

2: The deaerator operates stably and is suitable for negative pressure start-up and sliding pressure operation, reducing the need for manual and complicated adjustment operations during start-up and operation.

3: Good adaptability, fast heat exchange time, the deaerator can operate at low water temperatures and can exceed the output by about 50% in a short period of time.

4: Compared with spray deaerator, it has less steam exhaust and energy consumption.

2、 Technical characteristics and supporting parameters of rotary film thermal deaerator

3、 Structure and principle of rotary membrane thermal deaerator

4、 The structure of a rotary film thermal deaerator consists of a deaeration head and a water tank. We will focus on introducing the structural principle of the deoxygenation head.

5、 The structure of the deoxygenation head consists of five main parts: the outer shell, the cyclone group, the water grate, the liquid vapor network, and the steam distribution plate.

6、 1. Shell: It is made by welding a cylindrical body and a stamped elliptical head. Medium and small deaerators with low pressure below 150T/H are equipped with a pair of flanges connecting the upper and lower parts for assembly and maintenance purposes.

7、 2. Membrane generator group: composed of a water chamber, a steam chamber, a membrane generator, a condensate connection, a makeup water connection, and a primary steam inlet connection. The material of the membrane tube and drain pipe is made of stainless steel, and it operates year-round without maintenance.

8、 3. Dripping grates: The feed water that has undergone coarse deoxygenation in the membrane section and the drain water introduced through the drain pipe are mixed here for secondary distribution, and uniformly rained onto the liquid vapor grid below. The water grate can be adjusted according to the specific water temperature, and it operates year-round without maintenance.

9、 4. Liquid vapor network: It is composed of flat steel strips and a cylindrical body that are spaced apart from each other, and is equipped with a specially designed stainless steel flat wire mesh and stainless steel plate of a certain height. The feedwater is fully in contact with the secondary steam here, heated to saturation temperature and deeply deoxygenated to ensure that the content of deoxygenated water is below 10 μ g/L for low-pressure steam deaerators and below 5 μ g/L for high-pressure deaerators.  

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5. Steam distribution plate: It is made in a regular and evenly distributed manner according to a certain proportion, so that the main heating steam is in an evenly distributed state. It rises to heat softened water under non throttling conditions to ensure heating quality and achieve oxygen removal at saturation temperature.

4、 Guidelines for Fixed Rotation Membrane Thermal Deaerator

1: How many tons of deaerator need to be produced, and what is the capacity of the matching water tank.

2: Requirements for accessories of deaerator (conventional configuration: safety valve, water level gauge, pressure gauge, temperature gauge, water seal cylinder, rolling body).

3: The working pressure and temperature of the deaerator are generally atmospheric at 0.02Mpa and 104 ℃, and pressure at 0.58Mpa and 158 ℃.

List of spare accessories for deaerator

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