How to use phosphor to check whether filter bag damaged

Phosphor detected vulnerabilities bag house filter usually after a new installation, to test their airtightness. System, must first post-cleaning bag after the system is running a test for this situation and combine the characteristics of the dust detection scheme as we have worked to help detect the exact location of the leakage gray. Preparations Pink phosphor Before starting cast powder, be sure the bypass valve is in the closed state, the poppet valve is online (around some form of dust damper, damper must determine is open). Air flow induced draft fan was turned on to about 60% -70%, while the blower but also open a certain amount, so that a more even distribution phosphors smoothly. Owned special phosphor fluorescent detection and flashlight Depending on the plant, the post-test should be dark at night (to facilitate fluorescent detection) Operations Guide Detection, follow these guidelines for the operational requirements, leak detection operation, such as running scene change, please be adjusted according to actual situation: – First, in determining the bypass valve is closed, take the case of flue gas precipitator. In the cleaning system to stop running condition, Fan opening degree of 50% or more to run, preferably 60%. The phosphor per square meter filter area of the opening 2-4g amount of dust into the air intake duct. As for the opening of the general election in the flue gas to the dust just entering the air intake for the best position to ensure a uniform phosphor all put into the dust, it does not deposit inside the pipe or hopper. Inlet position phosphor efficiency test for the mouth, or from pre-coated gray piping into it. Otherwise it should be considered from the phosphor into the hopper outlet precipitator ash hopper access door or office. After the phosphor into dust, the fan should run for at least 20 minutes to ensure that the phosphor is uniformly distributed in the various compartments of the dust filter bag. After the phosphor inputs, turn off the fans, or to open the bypass, and then close the damper before and after ESP or poppet valve and open the dust cover, fluorescent lamp (ultraviolet light) to detect the net carefully gas chamber flower plate seams, bag with flowers plate interface points. When testing, ambient light, the darker the better for leak detection work. Also it is best to bypass valve is also associated check again, after all, related to the emissions standard view is not very tight. For precipitator, can cover a thick layer of dust on top of canvas (cover requirements after net gas chamber but not light) Analysis principle: If you find a bright orange and powder net gas chamber at a position, then the tainted vicinity, should pay attention to see the number and location of distribution to the powder, and marked with chalk. Observation Key Location: precipitator walls, bag valve bypass around the mouth If they are found to be clearly marked, and timely manner Treatment: After checking out the tag, take measures to repair welding, focusing on non-welding when welding sparks falling into the bag, to take preventive measures. . Pre-coated gray scheme Preparations Asher coating material is Ⅰ fly ash To use filling trucks with air pump dry fly ash conveying power. Opening of the induced draft fan should be above 70% in order to improve the efficiency of painted gray. After pre-coated gray butterfly valve to close. Tu theoretically total ash content: 50 m3 Ash speed to 10 cubic meters per hour. Plastering 5 hours. 8, make sure the bypass valve is in the closed state, the poppet valve is online. . Instructions and detection results Fan load operation until the end of the pre-coat gray about 20 minutes to ensure a more evenly distributed across smoothly inside the hopper. Which focus on the pre-coated in gray when the pressure rises inside each room to reflect, if the pressure in the first 100PA, after pre-coated gray least to 200–300PA, that is to say must increase 100–200PA, If not, pre-coated gray indicates failure, should be repeated. Which should be noted plastering time, the slower the better, faster, then basically it is deposited inside the hopper. Pressure display is gradually rising.