Common fault types and maintenance methods of plate heat exchangers_
Common fault types and maintenance methods of brand plate heat exchangers
1025 At present, the common failure types of brand plate heat exchangers mainly include leakage between the plate and the frame or outside the frame, leakage between the plates, internal leakage between the media and low heat exchange efficiency, which causes the plate heat exchanger What are the reasons for these situations? How to solve it? Below, the staff of Diguang Heat Transfer Technology Co., Ltd. will introduce to you the specific operation methods for the maintenance of the brand plate heat exchanger. 1. Leakage at the joint between the plate and the frame or outside the frame: Loosen the interface parts and check from the outside. If the fault is not found, please disassemble the heat exchanger and look for the fault. Reason analysis: 1. There is a gap (corrosion) in the joint of the end piece hole; 2. The joint is sealed in a misplaced position; 3. The joint is twisted by the force of the pipe; 4 the end piece gasket is damaged or corroded; 5 the end piece has a hole (corrosion). Solution: 1 change the joint; 2 fix the sealing ring; 3 hold up the pipe; 4 change the sealing gasket; 5 change the end piece. 2. Leakage between the plates Mark the leakage area between the two plates, disassemble the heat exchanger to confirm that the leaking part (through the spot), the sealing gasket is not damaged and gradually loosened, and the sealing gasket is not misaligned. Reason analysis: 1 the chip group is over-clamped, causing damage to the gasket groove; 2 the gasket is misplaced; 3 the chip group is over-clamped, the support beam is recessed, and the plate is twisted; 4 not fully clamped; 5 the plate is placed upside down; 6 pad Slots are double-layer sealing corrosion; 7 The gasket is cracked or worn, aging, or corroded. Solution: 1 change single or multiple pieces; 2 re-bond the gasket; 3 change the plate; 4 re-clamp; 5 change the direction of the plate; 6 change single or multiple pieces; 7 change the gasket. 3. Internal leakage between the media means that the two media in the heat exchanger have leaked from the high-pressure side to the low-pressure side for some reason. The method of detecting leakage is to frequently test the low-pressure side medium to judge from the change of its composition. Stop inspection method: 1 Disassemble the frame, scrub the plates, observe and check the missing pieces (light transmission, coloring, visual inspection, etc.); 2 If you can’t find out, you can wipe clean and regroup, press on one side, and disassemble the frame. It can be concluded that the plate is cracked on the side of the plate without water. Solution: Change single or multiple pieces, clean single or multiple pieces, and replace sealing gaskets. 4. Low heat exchange efficiency, low flow rate and high pressure drop, are identified as follows: 1 Pressure drop problem (pay attention to low flow rate, high pressure drop); 2 Heat exchange efficiency problem: normal flow rate. 1 Pressure reduction problem; 2 Heat exchanger efficiency problem: Measure inlet and outlet temperature and flow rate, and measure 6 times at 10 minutes intervals between each measurement, and change the measurement points of each measurement group in order. Cause analysis: 1 internal blockage; 2 flow trough blockage; 3 wrong placement of the plate causing side flow; 4 strong medium viscosity and slower circulation (flow); 5 high pressure drop when steam condenses is affected by the presence of non-condensed gas; 6 Plate fouling; 7 side flow caused by incorrect placement of plates; 8 actual data is different from the calibration data; 9 flow rate is different from the calibration value; 10 failure during condensation can be caused by the following reasons for the non-condensed gas steam dryness is too low condensed steam arch The valve or the steam control valve is faulty when the weather is too low; 11 there is gas in the heat exchanger; 13 the system design is faulty. Solution: 1 disassemble the heat exchanger to clean the interior; 2 disassemble the interface to clean the outlet; 3 rearrange the plates; 4 re-select or adjust the working conditions; 5 remove the non-condensed gas; 6 disassemble the heat exchanger and proceed Clean the plate and change the plate arrangement; 7 change the flow rate or requirements; 8 remove the gas and replace the condensate discharge valve or the air pump to replace the steam control valve; 9 modify the system. The above is the corresponding maintenance plan for several common failure types of brand plate heat exchangers, I hope to help you!