Plate heat exchanger pressure drop how to do?
Pressure drop how to do? Tell you why and how to deal with it.
Medium inlet and outlet pressure drop more than design requirements, and even higher than the design value of many times, seriously affecting the system on the flow and temperature requirements. In the heating system, if the hot side pressure drop is too large, then the primary side of the flow will be a serious shortage, that is, the heat source is not enough, leading to two times out of the temperature can not meet the requirements.
Cause of large pressure drop in plate heat exchanger
1, operation of the system is not normal pipeline purge, especially many dirt newly installed in pipeline system (such as welding slag etc.) into the heat exchanger, the heat exchanger channel area is narrow in sediments and suspended matter in the heat accumulation in the corner hole and diversion area, leading to the flow area reducing the pressure loss in this part of the main.
2, plate heat exchanger operation after a period of time, due to the plate surface fouling caused by excessive pressure drop. Example: in 2000, I plant to provide users with the Xinjiang BR10 plate heat exchanger for water and heat exchange of the central heating system, a water supply design temperature of 130. C. In the heat exchanger design selection, the heat transfer derivative is high, close to 5500 w/ (RN = K), and the actual should be at 3500 w/ (RN = K). At the same time, the design unit in pump selection and flow margin is too large, resulting in heat exchanger two side plate medium speed exceeds 1 m/s, the actual operation of pressure drop in the 0.2 ~ 0.3 MPa, the two network hydraulic balance imbalance.
3, plate heat exchanger for the first time when the selection area is too small, resulting in inter plate flow rate is too high and the pressure drop is too large.
Treatment method of plate heat exchanger pressure drop
1, remove the heat exchanger in the dirt or debris, for the new operating system, according to the actual situation once a week cleaning. Cleaning the surface of the plate scale (mainly refers to CaCO3). When using 0.8) nitrate solution containing 0.3 amino sulfonic acid solution containing 0.3 or 0.2, 0.1, topping oulo aniline potassium thiocyanate as cleaning liquid, cleaning temperature 4O ~ 6O C. Do not remove the chemical immersion cleaning equipment, to open the heat exchanger cooling medium inlet and outlet, or when the device is installed in the inlet and outlet nozzle arranged on the medium of DN25 cleaning, cleaning liquid with good injection equipment, clean with water after soaking residual acid to pH = 7. Open the cleaning, the plate will be soaked in the cleaning liquid 30 min, and then use a soft brush to brush the scales, and finally clean with water. In the process of cleaning, avoid the damage of plate and rubber pad. If used without removing the backwashing method of machinery, should be in the medium inlet and outlet pipe is connected with a pipe to connect the device with the mechanical cleaning vehicle, the cleaning fluid in the reverse direction of medium flow injection equipment, cleaning cycle time 1O ~ 15 min, flow rate control in 0.05 ~ 0.15 m/s. Finally, several times with clean water, so that the quality of water in the Cl concentration of 25 mg/I below.
2, two times the best use of recycled water after softening after the soft water, general requirements for the suspended material concentration in water is less than 5 mg/L, the impurities with diameters less than 3 mm, pH = 7. When the water temperature is not greater than 95 DEG C, Ca, Mg concentration should not be greater than 2 mmol/L; when the water temperature is greater than 95|C, the concentration of Ca, Mg should not be greater than 0.3 mmol/L, the concentration of dissolved oxygen should not be greater than 0.1.
3, for the central heating system, can be used once to two replenishment method.
In order to make the plate heat exchanger of customers to maintain in the best state, ARD Reed with years of technical experience accumulated over the years, with "dismantling, cleaning" and "improve the operation" and "local service" rich customers in order to make the plate heat exchanger is maintained in the best state, Ai Rui de ARD with years of technical experience accumulated over the years. "Dismantling, cleaning" and "improve the operation" and "local service" and other rich service menu, carry out maintenance services.
Repair and maintenance services to "take back the factory inspection and repair" and "on-site cleaning and maintenance", "take back the factory inspection and renovation" will be the client's plate heat exchanger host recovery, in the best state of recovery back. "On-site cleaning and maintenance" is the company's professional engineers to carry professional equipment to the user site operations, short time, high efficiency, will not delay the production and operation of customers. In addition, we also provide consulting services to help customers maintain the best state of plate heat exchanger.
Customers can choose the type of service according to the conditions and conditions of use, so you can maintain the best operating state of the machine in a variety of ways.
