The pressure testing method for pulse bag filter is as follows: firstly, the Auger gas analyzer method is used. The principle of measurement is to use different hand sanitizers to absorb each component of the gas one by one, compare the changes before and after absorption, and calculate the proportion of the components. 2、 Preparation for measurement: Adjust the micro pressure gauge to a horizontal position and check for bubbles in the liquid column of the micro pressure gauge; Check if the micro pressure gauge is leaking. Blow air (or suck air) into the inlet of the positive (or negative) pressure end of the micropressure gauge, seal the inlet, and if the liquid column position of the micropressure gauge remains unchanged, it indicates that the passage is not leaking air. We have checked whether the pitot tube is leaking. Use a rubber tube to connect the outlet of the full pressure tube to the positive pressure end of the micro pressure gauge, and connect the outlet of the static pressure tube to the negative pressure end of the micro pressure gauge. After blowing air from the measuring hole of the full pressure tube, if the liquid column position of the micro pressure gauge remains unchanged, it indicates that the full pressure tube is not leaking air; At this point, seal the static pressure measuring hole with a rubber tube or tape, and then open the full pressure measuring hole. At this point, the liquid column of the micro pressure gauge will drop to a certain position. If the liquid level does not continue to drop, it indicates that the static pressure tube is not leaking. 3、 Measurement steps: Insert the pitot tube into the sampling hole. When using an S-shaped pitot tube, the opening plane should be inserted perpendicular to the measurement section. If there is no vortex flow on the cross-section, the reading of the micro pressure gauge should be around zero; When using a standard pitot tube, before inserting it into the flue, cut off the passage between the pitot tube and the micro pressure gauge to avoid the alcohol in the micro pressure gauge being sucked into the connecting tube, which may cause errors in pressure measurement. At each measuring point, the full pressure hole managed by the night friend is facing the direction of the airflow, with a deviation of no more than 10. The dynamic pressure at each point is measured and recorded separately in the table; Repeat the measurement once and take the average. After the measurement is completed, check whether the liquid level of the micro pressure gauge has returned to the origin. 4、 The measurement of gas pressure is usually carried out by inserting a pressure measuring tube into the air duct to extract the pressure signal, and reading it on the pressure gauge connected to it. The instrument for taking the signal is a pitot tube, and the instrument for reading is a pressure gauge. Load debugging of pulse bag filter: 1. Connect all power sources, compressed air source, start the ash conveying equipment, and set the dust removal controller to manual mode; 2、 Connect the pressure measuring device (U-tube pressure gauge can be used) to the pressure measuring port of the dust collector; 3、 Start the main fan, observe the resistance of no-load operation, measure the air volume at the inlet and outlet, and calculate the air leakage rate. The air leakage rate should be less than 3%, otherwise it should be checked and dealt with. 4、 Start all process equipment, introduce dusty flue gas, observe the increase in operating resistance of the dust collector and the emission situation of the exhaust port. When the new dust removal filter bag is put into use, a small amount of dust will escape from the exhaust port, which is a normal phenomenon and will self destruct after a period of time. 5、 When the resistance of the dust collector rises to (1245-1470 Pa), start the dust cleaning controller to clean the dust and observe the pressure drop. 6、 After the entire process system is stable and normal, the cleaning cycle can be set (fixed resistance type can be omitted). The method is to first start the cleaning control instrument to work in automatic mode, and temporarily set the cleaning interval time in the cleaning controller at 1 minute. Observe the change in operating resistance. If the resistance continues to rise and exceeds 1470 Pa, it indicates that the cleaning interval time is too long. If the resistance continues to run below 1000 Pa, it indicates that the cleaning interval time is too short and needs to be adjusted (note: the cleaning interval time should not be less than 15 seconds) until the resistance stabilizes between 1000 and 1470 Pa, which is considered appropriate. Due to improper selection, some dust collectors still operate under high resistance for a long time (greater than 1800Pa) when the cleaning interval is adjusted to 15s. When the dust cleaning interval is long and operates under low resistance for a long time (less than 800Pa), the interval time can be determined according to the actual situation. As long as the ventilation situation in the system allows, it is not necessary to maintain the resistance between 1000-1470Pa. However, operating under high resistance for a long time will greatly shorten the life of the dust bag and its accessories. 7、 Observe the working condition of the ash discharge device. After normal operation, it can be put into operation. Analysis of the causes of air leakage in pulse bag dust collectors: Due to improper installation or maintenance of the dust collector, there is air leakage in the dust collector equipment, which draws a large amount of cold air from the outside into the bag type dust collector, causing a sharp drop in local air temperature and the analysis of water in the air, resulting in condensation. There are many reasons for air leakage in pulse bag filters. Some are caused by welding leakage during the production process of the dust collector housing, while others are caused by inadequate sealing of the unloader. There are also non-standard pipelines that have welding leakage during installation, and the connection between the dust collector and the non-standard pipeline flange is not tightly sealed, resulting in air leakage.
