What temp should be maintained of feed water and why?
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What temp should be maintained of feed water and why?
For this, the feed water temperature must be maintained at approx. 80- 85 deg C to ensure boiler is operated at high efficiency. Any reduction in the water temperature will lead to more time for heating up the water to produce steam, more fuel consumption and decrease in the overall efficiency.
Why boiler feed water is heated?
Boiler feedwater, consisting of fresh water plus returned condensate, is heated in the deaerator to full saturation temperature corresponding to the steam pressure. The purpose is to scrub out and carry away dissolved gases, especially oxygen.
Is standard for boiler feed water?
As a rule of thumb, about 1000 ppm can be considered a safe maximum. A hard water containing 200 ppm in the feedwater would tolerate five concentrations in the boiler (200 times 5 = 1000). On the other hand, a soft water with 25 ppm could be concentrated 40 times before reaching the critical point (40 times 25 = 1000).
What happens due to high temperature of feed water in the economizer?
What happens due to high temperature of feeds water in the economizer? Explanation: Function of the economizer is to recover a portion of heat of the exhaust gases before the flue gases enter the chimney and discharged to the atmosphere. Due to the high temperature of feed water, fuel consumption reduces.
How do I increase my boiler heat rate?
15 Ways To Increase Boiler Efficiency
- Increase Boiler Efficiency: Lower the Stack Temperature.
- Install an Economizer.
- Tune the Burner Regularly.
- Install a Variable Frequency Drive.
- Increase Boiler Efficiency: Insulate your Valves.
- Clean the Fireside.
- Preheat Combustion Air.
- Clean the Water Side.
Which heat the feed water before going to boiler?
Feed water preheating typically occurs in either the feedwater tank or deaerator using supplementary steam. Pre-heating the feedwater is the most basic method of mechanical deaeration, or the process of removing dissolved oxygen from water.
What are the parameters of boiler feed water testing?
The HI-3827 boiler and feedwater chemical test kit measures 6 main parameters; alkalinity, chloride, hardness, pH, phosphate and sulphite. All the tests are performed with a titration method except for the pH test.
What should be the pH of boiler feed water?
between 8.5 and 9.5
The consensus is that feedwater oxygen, iron, and copper content should be very low (e.g., less than 7 ppb oxygen, 20 ppb iron, and 15 ppb copper for a 900 psig boiler) and that pH should be maintained between 8.5 and 9.5 for system corrosion protection.
How do I increase the water temperature on my boiler?
How to Adjust the Water Temperature of a Hot Water Boiler
- Test your tap water temperature. Allow the water to run until it is fully hot and fill up a tall glass.
- Adjust the thermostat.
- Turn the knob on the side of the tank.
- Rotate the thermostat control.
What is recuperative air preheater?
Tubular air heaters are known as Recuperative type of air preheater. Recuperative air heater is generally called static air heater. The flue gas which is the heating medium passes through inside of the tubes whereas the air entering the air preheater passes through outside of the tubes by conduction.
What is the temperature of feed water in steam boiler?
There are some differences of temperature feedwater will be supplied to steam boiler and it has some levels temperature. The differences depend on system and type of boiler such as for Heat Recovery Steam Generator (HRSG) which does not has heating cycling process for condensate, the feedwater temperature flow through HRSG about 30-40 C.
What is the difference between 140°F and 180°F in boilers?
The difference between 140°F and 180°F in boiler feed water temperature equates to about a 3-4\% difference in boiler efficiency. Feed water preheating typically occurs in either the feedwater tank or deaerator using supplementary steam.
What is an improperly heated feedwater condition?
An “Improperly Heated Feedwater” condition occurs when the feedwater coming to the boiler is not adequately heated. Improperly heating feed water results in lower boiler efficiency, incomplete mechanical deaeration, and can cause cracking and catastrophic failure to the feedwater lines, boiler shell, and boiler tubes through thermal shocking.
Can a boiler feed water pipe be used as a heat exchanger?
Both effects will reduce the pipe’s overall thermal efficiency when used as a heat exchanger. Boiler feedwater is an essential part of boiler operations. The feed water is put into the steam drum from a feed pump.