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High purity water treatment equipment, EDI device, reverse osmosis equipment
High purity water treatment equipment, EDI devices, and reverse osmosis equipment in power plants. Coal fired thermal power plants are important compo
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High purity water treatment equipment for power plants, EDI devices, reverse osmosis equipment
Coal fired power plants are an important component of China's power industry. The use of water in the power industry is multifaceted, mainly including boiler makeup water, cooling water, and miscellaneous water for domestic firefighting.
1、 Overview of Ultra Pure Water Supply System for Power Boiler
Long term boiler operation practice has shown that the quality of boiler feedwater is one of the important factors affecting the safe, stable, and economical operation of boilers and thermal systems. Untreated water contains many impurities, especially calcium and magnesium ions. If these impurities enter the boiler system with the feedwater, they will cause great harm.
⑴ Formation of scale, resulting in uneven heating of the boiler and damage to metals;
⑵ Reduce thermal efficiency and increase energy consumption;
Cleaning scale requires the addition of chemicals, which increases operating costs;
⑷ Causing metal corrosion;
⑸ It is easy to deteriorate the quality of steam.
Large and medium-sized boilers in the power and heat industries suffer severe economic losses and social impacts due to high operating parameters and shutdowns caused by original boiler tube explosions
The noise is huge, so the water quality requirements for boiler feedwater are particularly high (power plant boilers require water quality with a resistivity greater than 5M Ω) CM、SiO2＜20μg/L）。 Generally, power plants and thermal centers set up chemical water treatment workshops to treat boiler feedwater.
The supply water for power plants often comes from surface water, groundwater, coastal areas, and areas lacking fresh water. Sea water is also commonly used as the supply water source, which must be treated by high-purity water equipment such as sedimentation, filtration, desalination, and degassing. Sea water as the supply water source needs to be treated by seawater desalination equipment before entering the power plant's water circulation system.
2、 The process of preparing ultrapure water for power boiler feedwater system can be roughly divided into the following categories:
1. The process of using ion exchange is as follows:
Raw water → raw water booster pump → multi-media filter → activated carbon filter → water softener → precision filter → cation resin filter bed → anion resin filter bed → anion resin mixed bed → microporous filter → water point
2. Adopting a two-stage reverse osmosis method, the process is as follows:
Raw water → Raw water booster pump → Multi medium filter → Activated carbon filter → Softener → Precision filter → First stage reverse osmosis → PH adjustment → Intermediate water tank → Second stage reverse osmosis (with positive charge on the surface of the reverse osmosis membrane) → Purified water tank → Pure water pump → Microporous filter → Water point
3. The process of using EDI is as follows:
Raw water → Raw water booster pump → Multi medium filter → Activated carbon filter → Softener → Precision filter → Primary reverse osmosis machine → Intermediate water tank → Intermediate water pump → EDI system → Microporous filter → Water point
3、 Comparison of three processes for preparing ultrapure water for power boiler feedwater system
At present, the processes for preparing ultrapure water for power boiler feedwater systems are basically the above three types, and most of the other process flows are derived from different combinations and combinations based on the above three basic process flows. Their advantages and disadvantages are listed below:
1. The first method of using ion exchange resin has the advantages of low initial investment and less space occupation, but the disadvantage is that it requires frequent ion regeneration, consumes a large amount of acid and alkali, and has a certain degree of environmental damage.
2. The second method uses a two-stage reverse osmosis equipment, which is characterized by a higher initial injection rate than using ion exchange resin, but does not require resin regeneration. Its disadvantage is that the relevant membrane components need to be cleaned or replaced regularly, and the water quality is relatively low, mostly only around 1 US/cm.
3. The third method is to use reverse osmosis for pretreatment and then equip it with an electro deionization (EDI) device. This is currently an environmentally friendly process for producing ultrapure water, which can continuously produce ultrapure water without the need for acid-base regeneration and has little environmental damage. Its disadvantage is that the initial investment is relatively expensive compared to the above two methods
YMROIn the series, high-pressure boiler feedwater treatment equipment is suitable for the treatment of boiler feedwater in thermal power plants and large and medium-sized industrial and mining enterprises. By using advanced reverse osmosis membrane components, pressure vessels, and other equipment, coupled with reasonable pre-treatment and post-treatment equipment, we can produce ultra pure water that meets national or industry boiler feedwater standards (GB1576-79, DL/T561-95). In membrane treatment systems, ultrafiltration used for pretreatment generally uses hollow fibers with a diameter of 1mm to remove suspended solids and colloids from raw water. The biggest problem with UF used for pretreatment is membrane fouling and pore blockage. Therefore, a pre filter is often set up in front to remove large suspended solids. Adding flocculants such as PAC (polypropylene dilute acid) before pre filtration can improve the filtered water quality and reduce membrane resistance. The required dissolved oxygen level for the boiler feedwater system in power plants is generally below 0.3 mg/L. Therefore, the deaeration membrane should be operated at a vacuum degree below 5.33 Kpa (40 TORR). The control system adopts industrial computer programmable control, which can achieve automatic start stop, dosing and flushing, and automatically monitor various operating parameters for production management.
4、 Operating parameters:
Single machine output: 10M3/h-120M3/h
Desalination rate: 98% for reverse osmosis system
Operating pressure: 1Mpa-1.5Mpa
Recovery rate: 75% -80%
5、 Characteristics of Ultra Pure Water Equipment for Power Boiler Feedwater System
Imported low roll composite reverse osmosis membranes with high desalination rate and low operating pressure produce excellent water quality, low operating costs, and long service life.
High efficiency and low noise.
Imported online water conductivity meters for raw water and product water, with pH meters that can monitor water quality at any time.
Imported online product water and concentrated water flow meters can monitor product water volume and system recovery rate at any time.
Configure an automatic cycle cleaning system for cleaning after membrane fouling.
Fast flushing valve regularly flushes the surface of the membrane to reduce the rate of membrane fouling and extend the service life of the membrane.
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