1、 Overview

(New rotary film deaerator, thermal rotary film deaerator, spray packing deaerator, atmospheric type, thermal type, water film type, vacuum deaerator) The deaerator produced by our factory is divided into two categories: rotary film deaerator and vacuum deaerator, of which the rotary film deaerator includes new rotary film deaerator and high-pressure deaerator. Vacuum deaerators are divided into low-pressure vacuum deaerators and two-stage jet type vacuum deaerators (referred to as headless deaerators).

Deaerator 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", which propose departmental standards for oxygen content in deaerator feedwater, that is, the oxygen content in low-pressure deaerator feedwater should be less than 15 цɡ/L, and the oxygen content in high-pressure deaerator feedwater should be less than 7 цɡ/L.

The rotary film deaerator is the latest type of thermal deaerator, which has won the Innovation Award for New Technology and New Product Science and Technology Research Achievements from the Ministry of Electric Power and has been listed as a key promoted product by the Ministry of Electric Power Deaerator 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", which propose departmental standards for oxygen content in deaerator feedwater, that is, the oxygen content in low-pressure deaerator feedwater should be less than 15 цɡ/L, and the oxygen content in 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 working principle of vacuum deoxygenation is to apply Henry's law and Dalton's law. According to Henry's law, in a closed container, if any gas exists on the water surface at the same time, the solubility of the gas is proportional to its own partial pressure, and the solubility of the gas is only related to its own partial pressure. Under a certain pressure, as the water temperature increases, the partial pressure of water vapor increases, while the partial pressure of air and oxygen decreases. At 100 ℃, the partial pressure of oxygen decreases to zero, and the dissolved oxygen in water also decreases to zero. When the pressure on the water surface is lower than atmospheric pressure, the solubility of oxygen can also reach zero at lower water temperatures. In this way, oxygen molecules on the water surface are expelled or converted into other gases, resulting in zero partial pressure of oxygen. Oxygen in the water continuously escapes, achieving the effect of deoxygenation.

This deoxygenation method is generally carried out at a temperature of 30 ℃ to 60 ℃. It can achieve deoxygenation at low temperatures on the water surface (at 60 ℃ or room temperature), and vacuum deoxygenation can be used to achieve satisfactory deoxygenation effects for thermal boilers and steam boilers with large load fluctuations and poor deoxygenation effects. Compared to thermal deoxygenation technology, its heating conditions are very low, the self consumption of steam in the boiler room is reduced, and the vacuum deaerator can be arranged at a low position, which requires higher requirements for key equipment such as jet pumps and booster pumps for operation and management than thermal deoxygenation. Low level layout also requires a certain height difference, and there are high requirements for the operation and management of key equipment such as jet pumps and booster pumps.

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2、 New rotary membrane deaerator:

The new rotary film deaerator (also known as membrane deaerator or or water film deaerator) is a new type of thermal deaerator developed jointly by our company and Xi'an Electric Power Thermal Power Institute. It has won the Innovation Award for New Technology and New Product Science and Technology Research Achievements of the Ministry of Electric Power and has been listed as a key promoted product of the Ministry of Electric Power. It is to use a steam turbine to extract steam and heat the boiler feedwater to the saturation temperature corresponding to the working pressure of the deaerator, remove oxygen and other gases dissolved in the feedwater, prevent and reduce corrosion of the boiler feedwater pipe, economizer, and other ancillary equipment It can be used for constant pressure, sliding pressure and other operating modes, and has the characteristics of stable operation, high deoxygenation efficiency, and good adaptability Suitable for deoxygenation of various types of power system boilers, industrial boiler feedwater, and thermal power plant feedwater Prove the following advantages:

1: High deoxygenation efficiency, with a 100% qualified rate of oxygen content in the feedwater. The oxygen content in the feed water of the high-pressure deaerator is ≤ 5 цɡ/L, and the oxygen content in the feed water of the low-pressure deaerator is ≤ 10 цɡ/L. Fully meet the standards issued by the Ministry of Electric Power)
2: Stable operation without vibration. 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: In addition to its good adaptability and low requirements for water quality and temperature, it can also operate at an output of about 50%, eliminating the need for a pre heater and saving equipment investment scale.
4: The exhaust volume is less than 0.1% of the inlet water volume, so there is no need to add an exhaust cooler. This optimizes the equipment, reduces heat consumption, and consumes one-third less energy than other types of thermal deaerators with the same output.

3、 Model, technical characteristics, and supporting parameters of rotary membrane deaerator:

CY - New type rotary film deaerator (complete supply of rotary film deaerator and deaeration water tank, and deaerator modification)

CYG series new high-pressure deaerator

4、 The structural characteristics of the new rotary film deaerator, the working principle of the rotary film deaerator, and the modification of the deaerator;


The rotary film deoxygenation equipment mainly consists of two major parts: the deoxygenation tower head and the deoxygenation water tank, as well as connecting pipes and external components. Its main component, the deoxygenation tower head, is composed of an outer shell, a new type of rotary film separator (membrane tube), a water spray grate, and a thermal storage packing liquid vapor network Below, we will focus on introducing the structural principle of the deoxygenation tower head

1. Shell: It is made by welding a cylindrical body and a stamped elliptical head The medium and low pressure deaerators are equipped with a pair of flanges connecting the upper and lower parts for assembly and maintenance, while the high pressure deaerator is equipped with a manhole for maintenance

2. Diaphragm unit: consisting of a water chamber, a steam chamber, a diaphragm tube, a condensate connection, a makeup water connection, and a primary steam inlet connection
Condensed water, chemical makeup water, and water are sprayed out in a spiral shape at a certain angle through a membrane separator, forming a water film skirt, and exchanging heat with the heating steam introduced through the primary heating steam connection to form a primary deoxygenation. The feedwater is heated to a saturation temperature close to the working pressure of the deoxygenator, that is, 2-3 ℃ lower than the saturation temperature, and undergoes crude deoxygenation Generally, about 90-95% of the oxygen content in the feedwater can be removed through this membrane spinning section

3. Dripping grate: It is made up of several layers of staggered angular steel, and the water that has been roughly deoxygenated by the rotating membrane section is redistributed here, falling uniformly in a rain like manner onto the liquid vapor screen installed below it

4. Thermal storage filling 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 wire mesh at a certain height. The feedwater is fully in contact with the secondary steam here, heated to saturation temperature and deeply deoxygenated. The low-pressure atmospheric deaerator is below 10ug/L, and the high-pressure deaerator is below 5ug/L (the departmental standards are 15ug/L and 7ug/L, respectively)

5. The deoxygenated water from the water tank is collected in the lower container of the deaerator, which is the water tank. The deoxygenated water tank is equipped with a scientifically designed strong heat exchange and reboiling device. This device has the advantages of strong heat exchange, rapid increase in water temperature, deeper deoxygenation, reduced water tank vibration, and reduced noise, which improves the service life of the equipment and ensures its safe and reliable operation

5、 The working principle of rotary film deaerator and the working principle of deaerator modification:

There are fundamental differences in the performance between the rotary film deaerator and other types of thermal deaerator such as spray packing type and spray pan type. The key lies in the heat and mass transfer mode of steam and water caused by its spray structure

The condensed water and supplementary water enter the water chamber of the internal membrane separator group of the deoxygenation head, and are obliquely sprayed from the small holes of the membrane tube to the inner holes under a certain pressure difference, forming a jet. Due to the rising heating steam filling the inner holes, a large amount of heating steam is sucked in by the water during the jet motion (it has been proven through experiments that the jet motion has a rolling effect). In a very short period of time, a violent mixing heating effect is generated in a small stroke, and the water temperature is greatly increased. The rotating water continues to spin down along the inner hole wall of the membrane tube, forming a rolling water film skirt (the critical Reynolds number of water decreases significantly during rotating flow, resulting in turbulent rolling). At this time, the heat and mass transfer effect of turbulent water is the most ideal, and the water temperature reaches Saturation temperature Oxygen is separated, and due to the rotating water flow being closely attached to the pipe wall and rotating downwards, a steam gas channel is formed in the middle of the rotating membrane tube, without a dead zone for gas flow. Oxygen cannot diffuse freely inside the inner hole, and the non condensable gas that precipitates is quickly discharged and can only be discharged into the atmosphere through the exhaust pipe with the rising steam (although old-fashioned deaerators heat water and separate oxygen, the specific gravity of oxygen is greater than that of the heated steam, and some oxygen is carried into the water tank by the downstream water, which is also a reason for poor deoxygenation effect)

The feed water that has undergone coarse deoxygenation in the rotating membrane section and the drain introduced through the drain pipe are mixed here for secondary distribution, and then evenly rained onto the liquid vapor grid below it. After deep deoxygenation, it flows into the water tank The oxygen content in the water tank of the high-pressure deaerator is 5u ɡ/L, while that of the atmospheric deaerator is less than 10u ɡ/L, which is much lower than the departmental standard (7u ɡ/L for high-pressure and 15u ɡ/L for low-pressure)

Due to the fact that the rotary membrane deaerator keeps the water in a turbulent state during operation and has sufficient heat exchange surface area, it has good heat and mass transfer efficiency, small exhaust volume (i.e., significant economic benefits due to low energy loss), good deaeration effect, and the surplus generated can enable the deaerator to operate at overload (usually exceeding 50% of the rated output) or under full water replenishment at low water temperature.

6、 Deaerator retrofit:

At the same time of supplying a complete set of new rotary membrane high-efficiency deaerator, we also undertake the technical transformation of the existing water spray pan deaerator, spray filler deaerator and other deaerator, which has achieved remarkable results,

There are several specific aspects: 1. The renovation cost is low, about half of the cost of replacing the deoxygenation head 2. Fast progress, easy processing and installation, deaerator with output below 200T/H It is usually completed within seven days 3. Stable operation without vibration 4. Good adaptability, with no strict requirements for water quality, water temperature, and water pressure


7、 Accessories for deaerator equipment:

The interface ring between the deaerator and the water tank is welded at the installation site to form the deaeration equipment. The accessories of the deaerator equipment include:
Safety valve: installed on the deoxygenation head and water tank. When the pressure inside the equipment exceeds the allowable value, the safety valve automatically opens to release pressure and provide safety protection.
Pressure gauge: installed on the upper part of the deaerator and the water tank to monitor the pressure inside the water tank.
Temperature gauge: installed in the middle of the deaerator and water tank to monitor the temperature inside the water tank.
Butterfly valve: installed on the heating steam pipeline, with the help of an electric regulator, adjusts the flow rate of heating steam to maintain the pressure inside the deaerator within the rated range.
Stop valve: installed on the secondary heating steam pipeline to regulate the flow rate of the secondary heating steam.
Regulating valve: installed on the chemical makeup water pipe, with the help of an electric water temperature regulation system, to regulate the flow of makeup water and maintain the normal water level of the water tank.
Water level gauge: installed on the water tank to monitor the water level inside the tank.
Dynamic gate valve: installed on the water discharge pipeline of the water tank. When the water level in the water tank exceeds a certain limit, the electric gate valve automatically opens with the help of the electric water level regulation system, and the excess water beyond the limit level is discharged to the drain tank.
Automatic pressure regulator: Automatically adjusts the opening of the heating steam inlet flange, which not only regulates the steam flow rate but also maintains stable pressure inside the deaerator.
Electric water level regulation system: automatically adjusts the supply water flow and controls the limit water level discharge valve (electric gate valve).
Monitor the temperature of the main condensate water in the deaerator, including chemical makeup water, drain water, heating steam inlet and feedwater, and exhaust steam outlet.
Monitor heating steam: pressure gauges for main condensate, chemical makeup water, and inlet pressure of drain water.

The above rotary film deaerator accessories and fittings can be purchased by our factory, but they are not within the scope of supply

8、 Installation, operation, and maintenance:

The installation of deaerator, water tank and accessories should be carried out according to the CY-CYG type rotary membrane deaerator system diagram and this instruction.
After welding the rotary membrane deaerator and water tank, a water pressure test should be conducted, and the pressure parameters of the water pressure test should be in accordance with relevant regulations.
Before formal operation, the safety valve should be adjusted. When the pressure inside the equipment reaches the specified value, the safety valve will automatically open.
Adjust the pressure automatic regulator to maintain the pressure of the rotary membrane deaerator within the specified range and the outlet temperature of the water tank within the specified temperature range. If the pressure of the rotary membrane deaerator exceeds the above range during operation, check whether the pressure automatic regulator has malfunctioned. Is the butterfly valve responsive in action.
Adjust the electronic water level control system to maintain the water level in the tank within the normal range of ± 100mm. When the water level reaches the normal water level ± 200mm, which is the limit water level, the high water level drain valve (electric gate valve) should be opened to release water, and it should automatically close when the water level drops. During operation, it is necessary to regularly check whether the electric water level regulation system is responsive and whether the supply water regulating valve is responsive.
During operation, the feedwater should be heated in the rotating membrane section to a pressure close to the saturation temperature of the rotating membrane deaerator (i.e. 2-3 ℃ below the saturation temperature).
Adjust the opening of the exhaust valve to achieve an exhaust volume of approximately 2-3kg of deoxygenated water per ton.
The water level gauge of the water tank should be regularly flushed to prevent contamination.
When operating the rotary membrane deaerator, the inlet valve should be opened first, followed by the heating steam inlet valve. When stopping, the opposite should be done, with the inlet valve closed first and then the inlet valve closed.
If water is found in the exhaust steam during the operation of the rotary film deaerator, the following methods can be taken to deal with it:
(1) Raise the inlet water temperature
(2) Automatic pressure adjustment device
(3) Manual voltage reduction operation
(4) Adjust the secondary heating steam shut-off valve.
During the maintenance of the rotary film deaerator, the water in the water tank should be drained and cleaned.
When the rotary membrane deaerator is shut down for a long time, appropriate anti-corrosion measures should be taken.

9、 Guidelines for deaerator retrofit

The following data is required for the technical renovation of old-fashioned deoxygenation equipment:

1: The output of the existing deaerator
2: The height, cylinder diameter, and wall thickness of the existing deaerator
3: The working pressure and temperature of each feedwater in the existing deaerator
4: Heating steam parameters (pressure, temperature, flow rate)
5: The on-site installation diagram of the existing deaerator