What is spray-type deaerator?
What is spray-type deaerator?
Spray-Type Deaerators A spray-type deaerator is typically a single horizontal vessel which has a preheating section and a deaeration section. The boiler feedwater is sprayed into the preheating section through the inlet water connection, where it is preheated by the saturated environment of the deaerator.
How do you size a deaerator?
Calculation Details
- Step 1: Determine Inlet Water Properties.
- Step 2: Determine Inlet Steam Properties.
- Step 3: Determine Feedwater and Vented Steam Properties.
- Step 4: Determine Feedwater and Vented Mass Flows and Total Outlet Energy Flows.
- Step 5: Determine Inlet Water and Steam Mass Flows.
How many types of deaerator are there?
two
There are two basic types of deaerators, the tray-type and the spray-type: The tray-type (also called the cascade-type) includes a vertical domed deaeration section mounted on top of a horizontal cylindrical vessel which serves as the deaerated boiler feedwater storage tank.
How much pressure is in a deaerator?
Deaerator uses Low pressure steam from the process plant at a pressure range between 0.5 to 1.5 bar.
What is the working principle of deaerator?
Principles of operation Thermal deaeration relies on the principle that the solubility of a gas in water decreases as the water temperature increases and approaches its boiling point. In the deaerator, water is heated up to close to its boiling point with a minimum pressure drop and minimum vent.
How do you remove oxygen from water in deaerator?
In a bubbling device deaerator, oxygen is removed following preheating of the water, through intimate contact of steam and water moving over perforated plates. In power generating stations, main turbine condensers have air ejectors to remove dissolved gases.
What is deaerator capacity?
According to the definition as given by the Heat Exchange Institute Standards , the Deaerator is a package unit capable of removing from the water all dissolved oxygen in excess of 0.005 cc/liter ( 7 parts per billion) at all loads up to and including the rated capacity.
How is deaerator vent rate calculated?
To calculate Deaerator Vent Rate, divide the vented steam mass flow rate by the feedwater mass flow rate, then multiply by 100.
What is deaerator principle?
Thermal deaeration relies on the principle that the solubility of a gas in water decreases as the water temperature increases and approaches its boiling point. In the deaerator, water is heated up to close to its boiling point with a minimum pressure drop and minimum vent.
Which chemical is used in deaerator?
Demulsifiers
| Action | Compound | % by wt |
|---|---|---|
| Demulsifying agent | Solution of a sulfonic acid, a phenolic resin, and alcohol | 5 to 15 |
| Antifoaming agent | Silicone | 1 to 3 |
| Dispersant | Imidazoline | 10 to 40 |
| Aromatic solvent | Benzene, toluene, xylene, residues of BTX distillation | 10 to 60 |
What temperature should a deaerator be?
In most applications you are looking for 5-7 psi of pressure and a temperature of 225 to 227 degrees. This will ensure the DA Tank can remove these gases and get the water up to temperature before supplying it to the boiler.
How much steam does a deaerator use?
Therefore, based on practical experience, deaerator manufacturers will tend to recommend a venting rate of between 0.5 and 2 kg of steam/air mixture per 1 000 kg/h of deaerator capacity to be on the safe side.