Best practice no 21

OUTSIDE COMBUSTION TESTING CONTRACTOR

If an outside firm is used for the combustion testing procedure, the plant needs to ensure the company and individual are qualified to conduct the combustion test. A number of items should be provided by the outside firm:

1. Insurance documentation to meet the plant requirements.

2. Standard operating procedures (SOPs) on the combustion testing process

a. The SOP should be a step by step documented procedure. A typical SOP is five to eight pages in length

3. Validation and calibration of the combustion analyzer and any other test instruments used for the combustion testing

4. A sample of the report that will be delivered after the testing is completed

5. A sample of the combustion testing data sheet that will be used during the combustion testing procedure

COMBUSTION TESTING DATA SHEET

It is extremely important to take all data during combustion tests to establish boiler benchmarks and compare them to the original boiler manufacturer's benchmarks. Do not allow combustion testers to provide the plant with only the printouts from a combustion analyzer. This is only a very small percentage of the information needed to properly manage boiler operation and energy .

CORRECT COMBUSTION TESTING DATA SHEETS

The combustion test sheet must show elements such as the fuel pressure to the burner, the air pressure in the air chamber or duct, the temperatures of the combustion gases, etc. are an example of the required elements. All data must be taken at ten different percentages of the boiler combustion load.

When there is an excess of air, it indicates the amount of air present in the reaction.

 = 1 for the exact amount of air,  = 1.5 for 50% of the amount needed

When,

 < 1 The amount of air is insufficient to consume all the fuel.

When,

 > 1 The amount of air is greater than that necessary to consume all the fuel. We will have plenty O 2 and we will continue to have CO Excess air coefficient Most combustions do not take place under these ideal conditions (complete and stoichiometric), the main aspect to consider will be the possibility that the combustion takes place with excess or lack of air. To characterize the proportion of oxygen, the par ameter “coefficient” is defined . of excess air” :

n = volume air per air fuel unit / Comburent Power

n = 1: Stoichiometric Combustion

n < 1: Air defect, called rich mixture

n > 1: excess air, the mixture is said to be lean

FOR-IM-024

REVISION DEL FORMATO: C

FECHA DE EFECTIVIDAD DEL FORMATO:10/03/2022