Baihuipu Upgrades Chemical Dosing and Online Monitoring

Baihuipu has upgraded the chemical dosing system at a captive power plant that had been dosing its water circuits by hand from day tanks on a shift routine. Twelve injection points across the make-up, boiler and cooling circuits were converted to metering pump skids with flow-paced control, and the manual sampling routine gained a set of online analyzers for pH, conductivity, ORP and silica. The upgrade was completed during a scheduled maintenance window, and the station now runs with chemical residuals held within their control bands by instruments rather than by the shift schedule.

Key Features and Benefits

Dosing Follows the Water, Not the Clock

The old routine dosed by timer and topped up by visual check, which means the chemical rate stayed constant while the water rate did not. Every skid now paces its metering pump from the flow it is protecting, so the dose per cubic metre stays constant as load moves between day and night. If your site also runs this kind of duty, Baihuipu Launches Remote Monitoring Platform for Plants system covers the cost side of the decision in more depth.

We set out the wider process route in circulating cooling water upgrade.

Stroke calibration was verified against graduated cylinders during commissioning rather than trusting the pump dial, and each skid keeps a local calibration record. Dosing pumps are reliable; uncalibrated ones are not. Much of this mirrors the situation set out in baihuipu expands overseas after-sales spare parts service.

Analyzers Where the Control Decision Lives

Online pH and conductivity went onto the treated make-up and the boiler feed lines, ORP onto the cooling basin biocide control, and a silica analyzer onto the boiler drum circuit where the blowdown decision is made. Sampling points and analyzer locations were chosen so a lab comparison takes minutes, not a walk across the plant. Much of this mirrors the situation set out in Baihuipu Puts Textile Water Reuse System Into Operation system.

Analyzer drift is the honest risk in any upgrade like this. The plant keeps a weekly grab-sample comparison, and two standard solutions per parameter are held at the analyzer cabinets so checks actually happen.

Alarms That Mean Something

Each control loop carries an alarm on the measured residual, not just on pump fault, because the pump running and the chemical arriving are different facts. A blocked injection point shows up as a residual drift long before it shows up as a pump alarm.

The historians log residuals, flows and alarms to the existing plant SCADA. After three months the station can show an auditor a residual trend with corrective actions attached, which was the outcome the chemistry supervisor actually wanted from the project.

Technical Specifications

Upgrade scope and control accuracy measured over the first month:

Why Choose Baihuipu as Your Manufacturer

Two decades in this industry teaches you that most treatment problems are procurement problems in disguise. Someone bought the cheapest skid, nobody checked the equalisation volume, and eighteen months on the plant cannot hold its consent limit. We build differently.

In-House Fabrication

Our Guangdong works produces everything from standard modular units to fully bespoke lines. Building in-house keeps cost, schedule and quality under our own control rather than a subcontractor's goodwill.

20+ Years Across Dozens of Industries

Experience matters most when your waste stream behaves nothing like the textbook example. We have dealt with toxic organics, heavy metals, extreme salinity and refractory COD in food processing, chemical manufacturing, electroplating, mining and municipal projects.

Complete Units and Turnkey Plants

Whether you need a single package unit or a turnkey installation with civil works, we deliver the entire treatment scheme. Our engineering team covers process, mechanical, electrical and automation so one party owns the outcome.

Spares, Service and Commissioning

Membranes, dosing pumps, diffusers, instrumentation and blowers are stocked for the systems we sell. Our control systems support remote diagnostics, and we can put an engineer on site for commissioning, training or an unplanned shutdown.

Let's Look at Your Numbers

Share your water analysis and site constraints and we will give you a straight assessment of the process route and the realistic operating cost before you commit to anything. Contact our engineers at WhatsApp: +86 13631765076, or find us at hkbhp.com.

WhatsApp: +86 13631765076

Customer FAQs

Why pace chemical dosing from flow instead of time?

Because the water flow changes with load while a timer does not. Flow pacing keeps the dose per cubic metre constant, which is what the chemistry actually responds to, and it stops overdosing at low load.

How often do online analyzers need calibration?

Weekly grab-sample comparison keeps drift visible, with full calibration monthly or when the comparison exceeds the tolerance. Holding standards at the analyzer cabinet is what makes the weekly check happen in practice.

Which parameters justify an online analyzer first?

The ones a control decision depends on: pH where dosing is trimmed, ORP where biocide residual is controlled, and silica where blowdown is set. Pure record-keeping parameters can stay manual without much cost.

Can the upgrade be done without a full outage?

Mostly yes. Skids are piped and wired with temporary chemical supply while the plant runs, and the cutover to each injection point is brief. The drum circuit silica analyzer usually needs the shortest window during low load. The operating detail behind this sits in boiler feed water treatment.

For adjacent technical angles, Baihuipu Starts Island Water Supply EPC Project and Baihuipu Delivers Brackish Water RO System to Industrial Park covers the same equipment from a different duty.