How do you measure a boiler blowdown?

How do you measure a boiler blowdown?

The optimum blowdown rate is determined by various factors including the boiler type, operating pressure, water treatment, and quality of makeup water. Blowdown rates typically range from 4% to 8% of boiler feedwater flow rate, but can be as high as 10% when makeup water has a high solids content.

How is blowdown loss calculated?

It is calculated by this equation:

1. Evaporation loss = 0.00085 Wc (T1-T2)
2. Drift loss = 0.02% water supply [for new development in eliminator design]
3. Blowdown = [ Evaporative loss – (COC – 1) x Drift loss] /(COC – 1)

How does COC calculate boiler?

A Key Concept in Boiler and Cooling Water Treatment

It can be estimated by dividing the conductivity of the system water by the conductivity of the makeup, or by dividing the chloride of the system water by the chloride of the makeup.

What is blowdown ratio?

Rate of blowdown is a rate normally expressed as a percentage of the water feed. In the case of boilers, rate of blowdown is the removal rate of water from a boiler. Its purpose is to control boiler water parameters within prescribed limits to minimize: Scale. Corrosion.

What is IBD and CBD in boiler?

IBD means Intermittent Blow Down and CBD means Continuous Blow Down. Both are from Drum of the boiler plant. In order to maintain the purity of water depending upon the hardness value and impurity level, continuous blow down of water from drum is done.

What is TDS blowdown?

Overview of TDS Blowdown Controls
During formation in the boiler, steam leaves behind impurities (TDS – total dissolved solids). If left these concentrate and cause damage to the boiler. High TDS results in plant and production problems. Low TDS results in increased fuel and chemical treatment costs.

What is blowdown loss in boiler?

blowdown losses. The energy (heated water) and chemicals (water treatment) that go down the drain each time the blowdown valves of a boiler are open, or each time the automatic control system opens a solenoid valve to accomplish the same effect.

What is EBD in boiler?

BLOWDOWN CONTROL FOR STEAM BOILER
The blow down control system consists of an amplifier box module type EBD, a blow down valve with pneumatic or electrical actuator. The amplifier box/regulator type EBD has adjustable functions for stand-by period (pause) and blow down impulses.

Why CBD Open in boiler?

CBD is a continuous process found in sub critical boilers. A part of feed water is removed from boiler drum to reduce the concentration of salts that get precipitated due to addition of chemical. To recover heat in continuous blowdown water a flash tank is used known as CBD Tank.

What is pH in boiler water?

Boiler pH. Natural water is usually between 6.5 and 7.5 pH. A common recommendation is to maintain boiler water at 8.5 pH.

Why CBD is given in boiler?

Products Information. CBD is a continuous process found in sub critical boilers. A part of feed water is removed from boiler drum to reduce the concentration of salts that get precipitated due to addition of chemical. To recover heat in continuous blowdown water a flash tank is used known as CBD Tank.

Why IBD is given in boiler?

This type of valve removes alkaline earths, phosphates or polyacrylates that may form a sludge at the bottom of the lowest boiler drum and can affect heat transfer.

What TDS should boiler water be?

Conventional shell boilers are normally operated with the TDS in the range of 2 000 ppm for very small boilers, and up to 3 500 ppm for larger boilers, provided the: Boiler is operating near to its design pressure. Steam load conditions are not too severe.

Why ammonia is dosed in boiler?

The purpose of ammonia dosing is to control the pH of water; pH is kept slightly alkaline to avoid corrosions from chloride and other salts, whereas DO is scavenged by dosing hydrazine. A very low ppb of DO can cause severe corrosion by pitting. Therefore a slight residual of hydrazine is kept in the system.

Why TSP is used in boiler?

Trisodium phosphate (Na3PO4), also known as TSP, is a common boiler water conditioning chemical that establishes moderately alkaline conditions in the boiler to minimize corrosion and reduce scaling where hardness ingress occurs.

Why phosphate is added in boiler?

Boiler feedwater can be protected from corrosive conditions through coordinated phosphate/pH control treatment. Phosphate buffers the boiler water, reducing the chance of large pH swings due to the development of caustic concentrations.

What is the TDS of boiler water?

What is a good TDS level?

between 50-150
What is the best TDS level for drinking water? Ans: Generally, the TDS level between 50-150 is considered as the most suitable and acceptable. Ans: If the TDS level is about 1000 PPM, it is unsafe and unfit for human consumption.

What is water pH value?

In its purest form, water has a pH of 7, which is at the exact center of the pH scale. Particles in the water can change the pH of the water, and most water for use has a pH of somewhere between 6.5 and 8.5. There are some important things to understand about the pH scale and how it relates to water.

How do you convert ppm to TDS?

To obtain an approximate sodium chloride TDS value, multiply the EC reading (in milliSiemens/cm) by 1000 and divide by 2. To get an EC value, multiply the ppm reading by 2 and divide by 1000.

What is pH full form?

The full form of pH is Potential of Hydrogen. pH is known as the negative logarithm of H+ ion concentration. Hence the meaning of the name pH is explained as the strength of hydrogen. pH describes the concentration of the hydrogen ions in a solution and it is the indicator of acidity or basicity of the solution.

What is the best pH?

However, most water contains particles that may change the pH value from 6.5 (slightly acidic) to 8.5 (basic or alkaline). The usual pH range of surface water systems is 6.5 to 8.5, whereas the pH range of groundwater systems is 6 to 8.5.
…
Table. Drinking water pH levels.

What is the unit of TDS?

The units for TDS usually are expressed as milligrams per liter (mg/l), which is the same as parts per million (ppm). Some meters show TDS as parts per thousand (ppt), which is equal to 1,000 ppm. The EC is a proxy measurement to determine the TDS in water.

What is ppm vs TDS?

PPM means parts per million. For example, 10 thousand PPM would be a 1 percent solution by weight. TDS means total dissolved solids. It is certainly possible to have 200 PPM of solids, or more, or less, dissolved in your water.

What is ppm full form?

This is an abbreviation for “parts per million” and it also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water.