Sulfuric acid valve control system

Email: sales01@cxflowmeter.com

whatsapp: 008618049841995

Sulfuric acid valve control system

Today a customer needs to buy a concentrated sulfuric acid valve control system, and he provided the following information:

Medium: concentrated sulfuric acid

Flow rate: 100kg/h

Pipe diameter: DN32

Pressure: 0.4Mpa

Temperature: room temperature

A flow meter + proportional valve is required to stably control the instantaneous flow rate, and the flow range is adjustable

Material: Hastelloy is recommended, and SS316 can also be recommended for proportional valves without Hastelloy C

Can Coriolis flowmeter + proportional valve be made into a valve control system?

If not, recommend something else

If possible, is it integrated or split?

The analysis of the sulfuric acid valve control system solution for customer needs is as follows:

1. Feasibility analysis of Coriolis flowmeter + proportional valve

Technical adaptability

Coriolis flowmeter: can directly measure the mass flow of concentrated sulfuric acid, with high accuracy (±0.1%-0.5%), and is less affected

 by temperature, pressure, and density changes, and is suitable for corrosive media. However, it is necessary to confirm whether its lining

 material is compatible with concentrated sulfuric acid (such as Hastelloy or PTFE lining).

Proportional valve: materials that are resistant to concentrated sulfuric acid corrosion (Hastelloy is preferred, SS316 needs to verify corrosion

 resistance) and have fast response and stable control capabilities.

System integration: Coriolis flowmeters and proportional valves can achieve closed-loop control through PLC or DCS, but additional controllers,

 signal conversion modules (such as 4-20mA to pulse) and explosion-proof designs (if required on site) are required.

Integrated vs split type

Integrated type: compact structure, easy installation, but the whole needs to be disassembled for maintenance, suitable for scenarios with

 limited space and low maintenance frequency requirements.

Split type: The flowmeter and valve are installed independently, which is convenient for separate maintenance and replacement, suitable for

 long-term operation or frequent maintenance conditions.

Recommended: Split design, because the concentrated sulfuric acid system has high requirements for sealing and material reliability, the

 split type can reduce the risk of single point failure.

Potential problems

Cost: Coriolis flowmeters are expensive and need to be equipped with high-precision proportional valves, and the cost of the overall solution

 may exceed the budget.

Response speed: If the proportional valve does not respond dynamically enough, it may cause flow fluctuations, which needs to be solved

 by optimizing PID parameters or selecting high-performance valves.

2. Recommended solution by technicians: Electric fluorine-lined control valve ZT941F46-16P DN32

Advantages of the solution

Material compatibility: Valve body 304 fluorine-lined (F46), which can withstand corrosion from concentrated sulfuric acid, and the cost is 

lower than Hastelloy.

Control accuracy: The electric actuator supports 4-20mA signal input, and can achieve closed-loop control with the flowmeter to meet the

 instantaneous flow stability requirements.

Economical efficiency: The price of the fluorine-lined control valve (￥500-20000/set) is significantly lower than the Coriolis + proportional

 valve solution, and it is easy to maintain.

Applicability: At room temperature and 0.4MPa pressure, the performance of F46 fluorine-lined is stable, and no additional cooling or 

pressurizing equipment is required.

Components to be supplemented

Flowmeter: A corrosion-resistant flowmeter (such as a turbine flowmeter or an electromagnetic flowmeter) must be configured separately. 

Recommended models:

All-PTFE turbine flowmeter: accuracy ±0.5%, resistant to concentrated sulfuric acid, price is about ￥4000-5000.

Electromagnetic flowmeter: no moving parts, high reliability, but the lining material (such as PTFE) needs to be verified.

Controller: If the customer does not have an existing DCS system, a simple PID controller (such as ￥1000-2000) is required.

If you also have specific chemical liquid flowmeters and valve control system requirements, please consult CIXIFM winny: 

Email: sales01@cxflowmeter.com

whatsapp: 008618049841995