Chemical Metering Pumps in a Power Plant

Have you ever wondered why power plants are located close to a water source such as a river? It is because of the need for water. Water is needed to generate steam to run the boilers and then water is needed to cool the systems after the electricity is produced from the turbines. According to estimation, the water consumption runs into thousands of gallons per Megawatt Hour of electricity produced. This water needs to be treated beforehand to get rid of organic and inorganic impurities. If the water is not treated it will start corroding the system and also reducing the efficiency due to scaling, etc. Following are some of the areas where chemical treatment of water is used in power plants.

1. Scale Inhibition, Hardness Stabilization: AquFlow Chemical Metering pumps are used for injecting phosphonates such as Phosphonobutane Tricarbonic acid.

2. Disinfection: AquFlow Chemical Metering pumps are used for injecting Sodium Hypochlorite and Paracetic Acid.

3. Flocculation: PAC (Poly Aluminum Chloride) or Ferric Chloride is injected using AquFlow pumps.

4. pH Adjustment with Acids: AquFlow Pumps are used for adding Sulfuric Acid or Hydrochloric Acid.

5. pH Adjustment with Caustic Soda: Sodium Hydroxide is added with AquFlow Chemical Metering Pumps.

6. Cleaning Agents: Formic Acid or Citric Acid.

7. Heavy Metal Precipitation: Sodium Sulfide or Hydrogen Sulfide is injected into the water using AquFlow pumps.

All these applications of chemical injection require precise amounts of dosing for the chemical. Hydraulically balanced diaphragm pumps are uniquely designed to deliver exact amounts of chemical regardless of the pressure and flow. They are very easy to adjust either manually or with a 4-20mA signal. They provide dual axis control, one with stroke length adjustment and another with RPM adjustment with a VFD. To facilitate the […]

By |April 12th, 2018|Metering Pumps Tips|0 Comments

Know Your Chlorine

Chlorine is one of the most commonly used disinfectants for water disinfection. Chlorine can be applied for the deactivation of most microorganisms and it is relatively cheap. Chlorine (Cl2) is one of the most reactive elements; it easily binds to other elements. In the periodic table Chlorine can be found among the halogens.

Watery chlorine should be protected from sunlight. Chlorine is broken down under the influence of sunlight. UV radiation in sunlight provides energy which aids the break-down of underchloric acid (HOCl) molecules. First, the Water molecule (H2O) is broken down, causing electrons to be released which reduce the chlorine atom of underchloric acid to chloride (Cl-). During this reaction an oxygen atom is released, which will be converted into an oxygen molecule: 2HOCl -> 2H+ + 2Cl- + O2

Chlorine is produced from chlorine bonds by means of electrolytic or chemical oxidation. This is often attained by electrolysis of seawater or rock salt. The salts are dissolved in water, forming brine. Brine can conduct a powerful direct current in an electrolytic cell. Because of this current chlorine ions (which originate from salt dissolving in water) are transformed to chlorine atoms. Salt and water are divided up in sodium hydroxide (NaOH) and hydrogen gas (H2) on the cathode and chlorine gas on the anode. These cathode and anode products should be separated, because hydrogen gas reacts with chlorine gas very aggressively. Chlorine-based bleach is applied as a disinfectant on a large scale. The substances are also used to bleach paper. Bleaching occurs as a result of chlorine or hypochlorite oxidation.

About 65% of industrialized chlorine is used to produce organic chemicals, such as plastics. About 20% […]

By |March 14th, 2018|Uncategorized|0 Comments

Flocculant Chemical Metering

Flocculants are polymers that promote flocculation by formation of links between themselves and thus enable suspended particles to aggregate. When the suspended particles are flocculated into larger ones, they are settled in devices like thickeners and clarifiers and removed with the underflow. The flocculants accelerate the settling process, which leads to the potential use of smaller thickeners. Flocculants can also be used to aid filtration.

Flocculation is employed for a variety of applications from mineral processing to purification of drinking water.
This includes:
• Concentrate and Tailings thickeners in the mining industry
• Water treatment plants
• Filtration aid
• Sewage applications
• Treatment of industrial waste water streams
• Clarification processes

Requirements of flocculant polymers are that they be strongly adsorbed onto the particles and that they are capable of spanning the gap between the particles. Synthetic polymers of high molecular weight are long enough for one end of a single molecule to adsorb onto one particle and the other end onto a second particle. Higher molecular weight polymers can adsorb on several particles at once, forming a three-dimensional matrix.

In general, the higher the molecular weight the better the flocculation and the faster the sedimentation rate. In the case of filtration, however, the lower molecular weight products can be more effective. This is because the flocs formed with high molecular weight products are relatively large, trapping water within the structure and increasing the final moisture content of the filter cake.

Most synthetic flocculants are based on polyacrylamide and its derivatives. Flocculants generally carry either a positive (cationic) or a negative (anionic) charge. Polyacrylamide itself essentially is nonionic and the desired ionic character is produced by copolymerisation with other monomers. Anionic polyacrylamides are produced by copolymerisation with acrylic acid, while for cationic polymers one of […]

By |February 12th, 2018|News|0 Comments

AquFlow Pumps in Cooling Tower Applications

Cooling towers are very common in industrial complexes and commercial buildings. The one thing common is that they use a lot of water. Water conservation requires that water to be recirculated. And that recirculated water needs to be treated to ensure that it does not corrode or scale the cooling elements. Additionally there are possibilities of organic growth within the water which requires treatment with biocides.

Corrosion Inhibitors – These are injected in the recirculated water to prevent corrosive damage to the components.
Scale Inhibitors – Scaling can be more damaging than corrosion sometimes as it drastically reduces the heat transfer. Anti-scalants are injected to prevent scaling in the pipes and tubes.
Biocides – There are two options here Non-Oxidizing Biocides and Oxidizing Biocides. The Non-Oxidizing biocides are dosed once or twice a week and they typically require and contact time of 4 hours. Oxidizing Biocides such as Chlorine and Bromine are used depending upon the pH of the water. Bromine is effective for pH up to 9 and Chlorine is good for lower pH around 6 or 7. Their level are usually measured using Redox (Oxidation Reduction Potential – ORP).

Fireproofing Injection Pump

Injecting Alum / Accelerator into the fireproofing materials is the key to effective coverage that stays in place on structures for a very long time. AquFlow pumps are widely used for their dependability for Alum injection applications in many fireproofing systems. The ability to easily operate and adjust the flow of the pump while it is running along with the reliability of AquFlow pumps which last for years with almost no maintenance makes AquFlow a preferred pump. AquFlow also has Duplex pumps which can pump material in two parallel lines to feed two sprayers simultaneously. So whether you are spraying on cementitious material like CAFCO 300 or fire resistive plaster like Monokote you will be in control and confident with AquFlow injection pumps.

Pumping Viscous Liquids with AquFlow Pumps

Not all liquid chemicals are the same. Liquid chemicals come in various shapes, consistencies, viscosities and solid content. In this article we are going to explore the most suitable options for pumping high viscosity liquids.

Viscosity is by itself a complex subject which requires a very detailed explanations to various kinds and measures of viscosity. For our purposes we will keep the discussion relatively simple. Viscosity of a liquid is the resistance it generates to flow. When a liquid flows it has various frictional resistances that act on it and within itself. Two major types of viscosities are the dynamic (shear) viscosity AKA absolute defined as the friction between adjacent layers of the liquid as it flows and the second one being the kinematic viscosity which is measured as the ratio of absolute viscosity to its density.

Hence the higher the viscosity is of a liquid the slower it flows or pours out of a container. If we were to take two jars of exactly the same size and shape and fill one with water and the other with honey. Then we try to pour the contents out by turning it at a 45 degree gradient downwards, we will notice that the water jar empties out in a fraction of the tie it takes for the honey to empty if it ever empties completely. This is an illustration of what viscosity does to the movement of a liquid which is the rate of flow. So now we have established that the higher viscosity liquids flow slowly.

AquFlow makes several modifications to its pumps depending upon the liquid and the application to make it ideal for these high viscosity liquids. Some of these are as follows,

1. We reduce the speed of the flow by reducing the strokes per minute. […]

Did you know Hydroflo is AquFlow?

Many of you may already know this, but we started our life as Hydroflo in 1972.

Hydroflo pumps were revolutionary in design and quickly built their reputation as one of the most durable pumps. Soon the teal colored pumps were all over known for their quality and reliability. Then after the original founder Mr. John Klembeth retired in 1996, the company changed hands a couple of times under two different managements. That is where the names Penn Process Technologies and Nikkiso come in.
In 2007, AquFlow re-launched the pump line with a new name and a fresh new look with Golden Yellow color. So whether you have a teal green pump, a yellow pump, a Hydroflo pump, a Penn Process pump, or a Nikkiso pump, you need to contact AquFlow for all the spares, accessories and replacement pumps.

By |June 5th, 2017|Case Studies, News, Products|0 Comments

Metering Pump Market Global Forecasts to 2020

The Metering Pump Market size is projected to grow at a CAGR of 6.3% to reach USD 4.6 Billion by 2020 according to a recent article posted by MarketsandMarkets.

Among these six applications of the metering pump market, water treatment accounted for the largest market share in 2014 in terms of number of units sold as well as value. Metering pumps have region specific demands that are differentiated by placement, cost, and efficiency. With the flourishing water treatment, pharmaceutical & petrochemicals, and oil & gas industries in the Asia-Pacific region, it is expected to register a high CAGR of over 7% between 2015 and 2020.

The metering pump market size is projected to grow at a CAGR of 6.3% to reach USD 4.96 Billion by 2020. In terms of value, the metering pump market size in water treatment application is projected to reach USD 1.75 billion by 2020, at a CAGR of 5.9% between 2015 and 2020. The growth is attributed to the increasing demand for environmentally friendly wastewater disposal and increasing investment in modernization of infrastructure. Diaphragm type metering pumps offer significant advantages over other type of metering pumps and hence, lead the market whereas plunger/piston type metering pumps, due to their maintenance issues and inability to handle abrasive fluids, are projected to register a relatively lower CAGR.

Asia-Pacific was the prime market for metering pumps in 2014 and is projected to register the highest CAGR between 2015 and 2020, backed by the increasing demand for metering pumps in China. The overall growth of the Asia-Pacific region will be supported by the high growth of the metering pump market in China and India, which are projected to register CAGR between 7%-8% during the forecast period. China is […]

Two Product Launches at the Ag Expo

Chem-Bot System

We were excited to launch our 2 new products at the Ag Expo last month.

Chem-Bot System.

Self Regulation Proportional Chemical Injection System.
– Chem-Bot is the solution to automatically and intelligently change the volume of the chemical in proportion to the flow in the pipe.
– It works by monitoring the flow in the irrigation water line sending a signal into the controller when flow changes.
– The controller then sends a corresponding signal to the VFD.
– VFD increases or decreases the chemical flow to keep desired raio.
– All of this without any human intervention and round the clock.
– This system is designed around simplicity and dependability.

Acid-Bot System

Acid-Bot System.

Automatic pH Balance Acid Injection System.

Acid-Bot by AquFlow is a fully automated system which measures the pH and controls it by adding chemical within the desired range. It does all this with minimal human effort once it is set up.

Controlling the Flow Capacity of a Metering Pump

Since a metering pump is usually a positive displacement pump there are two possible ways of controlling the flow capacity. The first one is by adjusting the volume of liquid displaced per stroke of the pump and the second is by adjusting the speed of the strokes.
I. Stroke Length – control the displacement volume per stroke
II. Speed of Strokes per minute

1. Stroke Length – Manual: All AquFlow hydraulic diaphragm metering pumps come with a standard manual knob to adjust the volume from 100% down to 5% or 10% without compromising the accuracy. On AquFlow pumps you can adjust the manual knob even while the pump is running unlike some other pumps where you have to turn the pump off before adjustment.
2. Stroke Length – Automatic ECCA: The stroke length can also be controlled automatically with an electronic signal (usually 4-20mA) coming from a source such as SCADA, PLC or a computer.
3. Stroke Speed / Frequency – VFD: We can adjust the speed of the pump by connecting a VFD to run the motor. Here again you can achieve very low flows by reducing the speed of the pump.
4. Dual Axis Control – Stroke Length And Stroke Speed Combined: Here we get the ultimate in control to the finest resolution by combining both the Stroke Length as well as the Stroke Speed. This can e done with a manual adjuster or automatic with electronic signal.