2022.02.07
Automatic Control of Phosphoric Acid Flow in Sucrose Sulfite Clarification Process
SHARE
MORE DETAIL
Application of Electric Corrosion-Resistant Regulating Valve: Automatic Control of Phosphoric Acid Flow in Sucrose Sulfite Clarification Process
Abstract: At present, regulating valve is generally used to control the flow rate of liquid phosphoric acid in sucrose sulfite clarification process. Thus, regulating valve generally has problem of poor corrosion resistance, slow response time and low automatic level. This article introduces a new type of corrosion-resistant electronic control valve based on needle valve, which adopts stepper motor propulsion and FFKM perfluoroether rubber sealing technology. It has good sealing performance and microsecond response speed that can be used in vacuum. It can be directly driven by a DC voltage signal or RS 485, and has been used in sucrose production lines.
1. Questions
In the current sucrose production process, the sulfite clarification process is generally used, and the phosphoric acid automatic control system requires the automatic proportioning of phosphoric acid. According to the flow of cane juice, the dosage of phosphoric acid is continuously and automatically adjusted in real time to ensure the accuracy of phosphoric acid addition. The phosphoric acid addition amount is controlled by adjusting flow rate of phosphoric acid liquid with a concentration of 85%, but there are the following problems that need to be solved urgently: (1) Poor corrosion resistance: Phosphoric acid solution with a concentration of 85% is a kind of inorganic medium-strong acid, which has certain corrosiveness. At present, the corrosion resistance of most electric flow control valves is generally poor and cannot be used for sulfuric acid flow regulation. (2) Low level of automation: At present, most of the phosphoric acid flow regulation still uses corrosion-resistant manual control valves. The poor accuracy and timeliness of phosphoric acid addition affects product quality, and it is impossible to accurately master the use of phosphoric acid. (3) Poor accuracy and slow response speed: Although there are also electric/pneumatic ball valves and butterfly valves for flow regulation, but generally the diameter is too large, the regulation precision is poor, and the response speed is slow, which cannot meet the ppm level regulation accuracy requirements of phosphoric acid flow.
2. Corrosion-resistant precision electric regulating valve
The corrosion-resistant electronic needle valve developed by KaoLu is a smart electronic two-way metering needle valve, which uses a high-precision linear stepper motor to drive the valve shaft. The main technical indicators are as follows:
(1) Contact material: stainless steel
(2) Sealing material: perfluoroether rubber (FFKM)
(3) Response time: 0.8s (fully closure to fully opening)
(4) Fluid: gas and liquid
(5) Pressure range: -1~7bar
(6) Spool throttle inner diameter: 0.9~4.1mm
(7) Flow range: 0.1~2000L/m
(8) Linearity: ±0.1~±11%
(9) Repeatability: ±0.1% (full scale)
(10) Operating temperature range: 0~84
(11) Control signal: 0~10VDC or RS485
(12) Working power supply: 24V (≤12W)
For further product information, please visit https://www.genndih.com/proportional-flow-control-valve.htm
Abstract: At present, regulating valve is generally used to control the flow rate of liquid phosphoric acid in sucrose sulfite clarification process. Thus, regulating valve generally has problem of poor corrosion resistance, slow response time and low automatic level. This article introduces a new type of corrosion-resistant electronic control valve based on needle valve, which adopts stepper motor propulsion and FFKM perfluoroether rubber sealing technology. It has good sealing performance and microsecond response speed that can be used in vacuum. It can be directly driven by a DC voltage signal or RS 485, and has been used in sucrose production lines.
1. Questions
In the current sucrose production process, the sulfite clarification process is generally used, and the phosphoric acid automatic control system requires the automatic proportioning of phosphoric acid. According to the flow of cane juice, the dosage of phosphoric acid is continuously and automatically adjusted in real time to ensure the accuracy of phosphoric acid addition. The phosphoric acid addition amount is controlled by adjusting flow rate of phosphoric acid liquid with a concentration of 85%, but there are the following problems that need to be solved urgently: (1) Poor corrosion resistance: Phosphoric acid solution with a concentration of 85% is a kind of inorganic medium-strong acid, which has certain corrosiveness. At present, the corrosion resistance of most electric flow control valves is generally poor and cannot be used for sulfuric acid flow regulation. (2) Low level of automation: At present, most of the phosphoric acid flow regulation still uses corrosion-resistant manual control valves. The poor accuracy and timeliness of phosphoric acid addition affects product quality, and it is impossible to accurately master the use of phosphoric acid. (3) Poor accuracy and slow response speed: Although there are also electric/pneumatic ball valves and butterfly valves for flow regulation, but generally the diameter is too large, the regulation precision is poor, and the response speed is slow, which cannot meet the ppm level regulation accuracy requirements of phosphoric acid flow.
2. Corrosion-resistant precision electric regulating valve
The corrosion-resistant electronic needle valve developed by KaoLu is a smart electronic two-way metering needle valve, which uses a high-precision linear stepper motor to drive the valve shaft. The main technical indicators are as follows:
(1) Contact material: stainless steel
(2) Sealing material: perfluoroether rubber (FFKM)
(3) Response time: 0.8s (fully closure to fully opening)
(4) Fluid: gas and liquid
(5) Pressure range: -1~7bar
(6) Spool throttle inner diameter: 0.9~4.1mm
(7) Flow range: 0.1~2000L/m
(8) Linearity: ±0.1~±11%
(9) Repeatability: ±0.1% (full scale)
(10) Operating temperature range: 0~84
(11) Control signal: 0~10VDC or RS485
(12) Working power supply: 24V (≤12W)
For further product information, please visit https://www.genndih.com/proportional-flow-control-valve.htm