一、Overview

The dosing device is a complete device that injects chemical liquid into various systems according to the process flow. The device can be divided into three categories according to the use occasion.

1、Oilfield dosing device. It is mainly used to inject flocculants, scale inhibitors, corrosion inhibitors, demulsifiers and other chemicals into the wellhead and other systems on the platform during oil extraction.

2、Boiler dosing device. It can be used to add ammonia and hydrazine to boiler feed water, add ammonia and hydrazine to condensate water, add ammonia and hydrazine for shutdown protection, and add phosphate to steam boilers. It is mainly used in power plants and power stations.

3、Water treatment and dosing device. Add chemicals to tap water, wastewater, and sewage during the water treatment process. Mainly used in processes related to water supply and drainage, environmental protection and other processes. Such as water plants, hotels, restaurants, swimming pools, sewage treatment plants, etc.

二、Working principle

The dosing device uses a metering pump as the main dosing equipment, a dissolved medicine tank, a stirrer, a dosing device level gauge, a safety valve, a check valve, a pressure gauge, a filter, a buffer, pipelines, valves, and a base. , escalators, automatic monitoring systems, power control systems, etc. are assembled on a common platform according to process flow requirements to form a module, the so-called skid-mounted combined unit (referred to as "skid body"). The working process of putting a certain amount of medicine into the stirring solution tank for stirring and dissolving as needed, and then sending it to the dosing point through a metering pump after the dissolution is completed. The amount of medicine can be adjusted freely to meet the needs of different places with different dosages.

The dosing device adopts an electromechanical integrated structure. It can be divided into fixed type and mobile type (trolley type) in terms of installation. Each form of dosing device is equipped with a mixing system, a dosing system and an automatic control system. . Several fixed skids can be combined into a whole, and coupled with the frequency conversion control system, local control, remote automatic control, and manual and automatic conversion of dosing can be realized. The Zhuli dosing device has the advantages of compact structure, small size, low noise, stable operation, simple installation, and easy operation and use.

The dosing device accurately configures solutions of various solid and liquid chemicals through different process designs, and then accurately adds them with metering pumps to meet various design requirements. Such as descaling, deoxidation, coagulation, adding acid, adding alkali, etc. The dosing process can be operated manually or through various electrical appliances and instruments such as PC, magnetic flap level gauge, pH meter, stroke controller, frequency converter, etc. to make the dosing device a mechatronics product and realize automatic control.

The dosage and pressure of the dosing device can be determined by selecting an appropriate metering pump according to the needs of the industrial process.

The dosage and pressure of the dosing device can be determined by selecting an appropriate metering pump according to the needs of the industrial process. The flow rate ranges from 1L/h to 8000L/h, and the pressure ranges from 0.1MPa to 25MPa. Suitable products can be selected.

The metering accuracy of the metering pump can be as high as ±1%, and it can transport multiple media at the same time and adjust it individually.

The volume of the solution tank in the dosing device can range from a minimum of 0.1m3 to 20m3, and can be selected according to the amount of dosing. Depending on the delivery medium, there are a variety of materials to choose from, such as carbon steel (carbon steel lined with rubber), stainless steel, non- Metal materials (PE, PVC, PP, PTFE), etc.

三、Performance description

The complete set of equipment mainly includes the feeding system, chemical storage barrel, chemical dosing system, power control system, etc.

The dissolving barrel is equipped with liquid level gauges, low liquid level alarms, valves and other facilities required for automatic operation. A magnetic flap liquid level gauge is installed on the outer wall of the barrel to observe the liquid level in the barrel in real time. There is a feed port and a backup port on the whole body. On the side of the barrel, there are a discharge port, a drain port, an overflow port, a liquid level gauge interface and Corresponding matching valves. When the liquid level in the barrel is lower than the set low liquid level value, the alarm system is automatically turned on and the dosing pump is paused.

The dosing system includes centrifugal pumps, electromagnetic flow meters and related valves, etc.

四、Technical parameters