Equipment for water-chemical treatment, which is critical in the steam-water cycle of thermal power plants, industrial boilers, etc. Adding microdoses of hydrazine solution to the boiler feedwater reacts chemically with the dissolved oxygen (O₂) in the feedwater to form nitrogen and water.
Equipment for water-chemical treatment, which is critical in the steam-water cycle of thermal power plants, industrial boilers, etc. Adding microdoses of hydrazine solution to the boiler feedwater reacts chemically with the dissolved oxygen (O₂) in the feedwater to form nitrogen and water. Completely removes residual trace amounts of dissolved oxygen, preventing oxygen corrosion. This is a complement and guarantee for mechanical oxygen removal (eg thermal deaerator). At the same time, hydrazine reduces high-valent, easily soluble iron and copper oxides (for example, Fe₂O₃, hematite) in the system to low-valent, dense and stable protective films (for example, Fe₃O₄, magnetite), forming a strong passivating film on the metal surface, which further suppresses corrosion. The reaction products, nitrogen and water, do not increase the content of dissolved solids in the water and do not pollute the water. Provides protection for the entire system, since hydrazine, like water, is volatile and penetrates with steam into the entire thermal system (boiler, steam lines, condenser, etc.), providing protection and passivation of the entire system.
This installation mainly consists of four parts: reagent solution storage system, dosing system, dilution and mixing unit, monitoring and control system, and auxiliary safety equipment. A commercial hydrazine solution (typically 40%) is diluted with demineralized water in the tank to a lower concentration (e.g., 0.1–0.5%) to ensure dosing accuracy and reduce risk. A dosing pump delivers a precisely measured amount of hydrazine solution into the pipeline at the outlet of the deaerator or at the inlet of the feed pump. Hydrazine reacts with dissolved oxygen in the feedwater line. A downstream dissolved oxygen analyzer and/or hydrazine analyzer monitors treatment efficiency in real time and transmits a signal to the controller. The controller, based on the measurement results, automatically adjusts the dosage of hydrazine.
Has the following features
1. Complete removal of oxygen, protects the entire system.
2. Does not increase the salt content of water.
3. Has a passivating effect, capable of restoring damaged protective film.
◆ Boilers for thermal power plants.
◆ Industrial high-pressure steam boilers, especially in industries with extremely high requirements for steam quality.
◆ Secondary circuit of nuclear power plants. Typically used in conjunction with an ammonia dosing unit, forming the water mode “AVT(R) - fully volatile reduction”.
Review
JY series dosing equipment is designed to meet the needs of the market and customers, as well as to provide production automation in such fields as petroleum, chemical, oil refining, gas production, water supply, thermal power, pharmaceuticals, food processing and others. It uses advanced technology and production processes from the United States, Germany, Japan and other countries, strictly in accordance with the requirements of technological standards and taking into account the actual conditions of China.
JY series dosing equipment is characterized by completeness, advanced technology, high degree of automation, convenient operation, easy maintenance, and the ability to meet the needs of various operating modes. Custom products can also be designed and manufactured to meet specific user requirements.
JY series dosing devices are widely used for dosing reagents in boiler water (ammonia, hydrazine, phosphates), dosing into source water (flocculants, coagulants, acids, alkalis, etc.), dosing into circulating water (corrosion inhibitors, scale inhibitors, fungicides, concentrated sulfuric acid, alkaline solutions, etc.), for chemical additives in oil and gas fields, waste and sewage water treatment, as well as in other operating modes.
The JY series dosing device consists of a solution tank, stirrer, level indicator, dosing pump, filter, damper (buffer), safety valve, various types of fittings, electrical control part, common base with platform and ladder, and pipeline fittings.
Check valve
Complete dispensing devices include the following three categories: simple dispensing device, integrated dispensing device, separate dispensing device.
Simple dosing device
The simple dosing device is equipped with a small dosing pump, stirrer, level sensor and other accessories. All of them are directly installed on the dosing barrel. Thanks to its flexible configuration, small footprint and high efficiency, it is very suitable for use in small dosages. Optional accessories: injection valve, pulsation damper, back pressure valve, control cabinet, etc.
Integrated dosing device
An integrated dosing device means installation in a single unit, that is, the solution tank, agitator, level gauge, dosing pump, control cabinet, ladder platform and other accessories (such as safety valves, dampers, check valves, etc.) are all installed on one channel base.
The metering device combination covers various types, such as "one tank - one pump", "one tank - two pumps", "two tanks - two pumps", "two tanks - three pumps", "two tanks - four pumps", as well as multi-tank configurations with pumps, etc.
Based on the control method, a basic type and an intellectual type are distinguished. The basic type is an open ramp dosing system. The necessary accessories can be selected to ensure more accurate dosing.
Intelligent dosing control system means open-loop control to achieve a fixed proportion. It can also realize closed-loop automatic control based on the set parameter signal and communicate with the superior computer (host computer).
Advantages of an integrated dosing device
1. Aesthetic appearance, varied design, flexible configuration.
2. Stable performance, compact structure, small footprint.
3. Ease of use, high ability to combine.
4. Wide functionality, large selection of accessories, flexible expansion of functions.
5. Ability to design specific dosing system based on user requirements.
Separate dosing device
The separate dosing device is used in some special conditions, such as large dosing volume, specific dosing medium, when it is inconvenient to combine the solution tank and dosing pump in one unit. If the customer has a large solution tank, the dosing pump unit should be installed separately from the solution tank, and then its inlet should be connected by a pipe to the solution tank outlet. Such a device is called a split dosing device. The solution tank may be a large polyethylene container, a stainless steel container, or a cement tank, etc. The pump dosing unit is determined by the number of dosing points, usually it is a single-pump type, a two-pump type (one working, one standby), a three-pump type (two working, one standby), a four-pump type (two working, two standby). The base of the pump dosing unit is made of high-strength channel. The pipeline is secured using brackets and is characterized by its small footprint and rational design.
Equipment for water-chemical treatment, which is critical in the steam-water cycle of thermal power plants, industrial boilers, etc. Adding microdoses of ammonia water (NH₂OH) or liquid ammonia (NH₃) to the boiler feed water to increase the pH of the feed water (usually maintained in the range of 8.8–9.3 or depending on specific conditions) allows the formation of a stable protective film of magnetite (Fe₃O₄) on the surface of the metal (for example, carbon steel).
SKF bearings, a world famous brand, provide more stable performance.
A magnetic centrifugal pump (hereinafter referred to as a magnetic pump) usually consists of an electric motor, a magnetic coupling and a corrosion-resistant centrifugal pump. Its main feature is the use of a magnetic coupling to transmit power in a completely leak-free manner.
Technical parameters: capacity up to 140 m³/h, pressure up to 24 bar
Thanks to the reciprocating movement of the plunger, the working medium is directly sucked in or pumped out. Since the plunger and seal are in direct contact with the fluid, the correct choice of plunger material and seal type will ensure more ideal pump performance during operation.
The all-plastic pneumatic diaphragm pump can pump not only fluid liquids, but also transport some non-fluid media. Compared with self-priming pumps, submersible pumps, shielded motor pumps, clay slurry pumps and solids pumps, this model has many advantages.
This series of chemical pumps for corrosive liquids are vertical, the suction and discharge pipes of the pump have the same diameter, and their center lines are on the same horizontal line and orthogonal to the vertical shaft.
Equipment for automatic and precise dosing of chemical reagents into circulating cooling water systems, boiler plants or other water systems. Its main purpose is to prevent scale formation, corrosion and biological fouling (algae, bacteria) in the system by dosing certain chemicals, thereby ensuring its safe, stable and efficient operation.
This series of horizontal centrifugal pumps are horizontal, radial split, open back, single stage, single suction volute type centrifugal pumps. The design of the impeller is closed type. The pump body has an axial suction pipe, a discharge pipe located on top, and a foot support.
Using the most advanced welding technology, KQDP/KQDQ has high corrosion resistance and high efficiency. Efficiency can be 5-10% higher than cast pumps.
The DG series segmental multistage centrifugal pumps use tension pins to connect the suction section, intermediate sections and discharge section into a single unit.
Regular stock of frequently used spare parts and wear parts to ensure timely delivery in case of urgent need.
Self-priming magnetic pumps of the ZFT series fully combine the advantages of a magnetic pump and a self-priming pump: they have a self-priming function, but at the same time they do not have a shaft seal, they use transmission through a magnetic coupling, which completely eliminates the phenomenon of drip leaks.
The centrifugal chemical pump made of fluoroplastic type FSC (hereinafter referred to as the pump) developed by our company is a single-stage, single-pass cantilever centrifugal pump. It is manufactured using superior hydraulic design and advanced, proven processing technology.
Thanks to the reciprocating movement of the plunger, the working medium is directly sucked in or pumped out. Since the plunger and seal are in direct contact with the fluid, the correct choice of plunger material and seal type will ensure more ideal pump performance during operation.
Although reagent dosing plants in the petroleum and petrochemical industries do not directly produce products, they are an indispensable “guardian” and “lubricant” in the entire production chain.
