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Precautions for operating a centrifugal pump
When operating a centrifugal pump, the following points should be noted: ① Do not operate without water. Do not adjust the suction port to reduce the displacement. Do not operate at too low a flow rate. ② Monitor the operation process, completely prevent the leakage of the stuffing box, and use new packing when replacing the stuffing box. ③ Ensure that the mechanical seal has sufficient water flow for flushing. Excessive water flow is strictly prohibited for water-cooled bearings. ④ Do not use too much lubricant. ⑤ Conduct inspections at the recommended intervals. Establish operation records, including operation hours, adjustment and replacement of packing, addition of lubricants and other maintenance measures and times. The suction and discharge pressure, flow rate, input power, temperature of the washing liquid and bearings, as well as the vibration conditions of the centrifugal pump should all be measured and recorded regularly.
Details >The main control indicators for the deep filtration process of granular filter media include: filtration rate and filter cell area, head loss area, head loss and working cycle, the dirt-holding capacity of the filter media layer and the depth of impurity penetration. (1) Filtration rate and Filter area: Filtration rate refers to the flow rate passing through a unit area, with the unit being m/h. Filtration rate is an important indicator for controlling the investment in filter tanks, influencing water quality and operation management. There are two situations of filtration speed: one is the filtration speed under normal working conditions; Another type is the forced filtration rate adopted by the remaining filters to share the processing capacity when a certain filter is unable to operate due to flushing, maintenance or other reasons. The filtration rate is related to the composition of the filter material in the filter tank, as shown in the following table: Note: The relative density of the filter material is: quartz sand 2.50-2.70; Anthracite 1.4-1.6 Heavy ore 4.40 ~ 5.
Details >What are the requirements for the performance indicators of filter materials?
Filter media are the main medium for completing filtration. The performance of filter media includes the following aspects. (1) Effective particle size and non-uniformity coefficient: The specifications of filter media are commonly expressed by effective particle size and non-uniformity coefficient. Effective particle size (d10) refers to the diameter of the sieve holes through which 10% of the filter material by mass can pass, with the unit being mm. d10 reflects the particle size of the filter material and is the main part causing head loss. The non-uniformity coefficient (K80) is the ratio of d80 to d10, where d80 refers to the pore size of the sieve passing through 80% of the filter material mass. The larger the K80, the more uneven the particles will be. Small particles will fill the gaps between the particles and the trapped ones, resulting in a decrease in pore size, a reduction in dirt-holding capacity, and an increase in head loss. For single-layer quartz sand, d10=0.55mm and K < 2.0. In the double-layer filter material, the d10 of anthracite is 0.85, K90 is less than 2.0, and the d10 of quartz sand is 0
Details >The regeneration process of the boiler softened water equipment
The regeneration process of boiler softened water equipment generally consists of the following four steps: 1. Backwashing: After the equipment has been in operation for a period of time, a lot of impurities brought by the raw water will be intercepted on the upper part of the resin. Only after removing these impurities can the ion exchange resin be exposed and the regeneration effect be guaranteed. The backwashing process involves water being washed in from the bottom of the resin and flowing out from the top, which can wash away the dirt trapped at the top. This process usually takes about 5 to 15 minutes. 2. Salt absorption (regeneration) : This is the process of injecting brine into the resin tank. Traditional equipment uses a salt pump to inject brine, while fully automatic equipment uses a dedicated built-in injector to draw in brine (as long as there is a certain pressure in the incoming water). In the actual working process, the regeneration effect of salt water flowing through the resin at a slower speed is better than simply soaking the tree in salt water
Details >What types of ozone generation devices are there?
Ozone can be obtained through high-voltage discharge (halo discharge), chemistry and other methods. According to the way ozone is generated, there are mainly three types of ozone generators at present: the first is high-voltage discharge type, the second is ultraviolet irradiation type, and the third is electrolytic type. 1. High-voltage Discharge Generator Ozone is produced by using a high-voltage current of a certain frequency to create a high-voltage corona electric field, causing oxygen molecules within or around the electric field to undergo electrochemical reactions. This type of ozone generator features mature technology, stable operation, long service life and large ozone output (up to 1kg/h for a single unit), making it widely used in related industries both at home and abroad. In high-voltage discharge ozone generators, there are the following types. 1. According to the high voltage frequency of the generator, there are power frequencies (50~60Hz).
Details >
Yuan LaiEDIThe ultra-pure water equipment uses electro-deionization technology.EDIElectrodeionization is a water purification method that combines the dual advantages of electrodialysis and ion exchange. It does not require acid-base chemical regeneration and can continuously and stably prepare high-purity ultrapure water. Under the action of a direct current electric field, ion separation in water is completed. At the same time, water is electrolyzed to generate hydrogen ions and hydroxide ions, achieving automatic regeneration of the resin without the need to stop the machine for manual regeneration. The pre-treatment combined with reverse osmosis can prevent oxidized substances from damaging the resin, ensuring stable effluent quality and widely meeting the high-standard water usage requirements of various industries.
The non-negative pressure water supply equipment can be directly connected to the municipal water supply network, making full use of the residual pressure of the original network for superimposed water supply. Fully enclosed operation does not require the construction of a domestic water tank, eliminating secondary pollution. Intelligent variable frequency voltage stabilization, energy-saving, quiet and easy installation, it is the preferred equipment for secondary water supply in high-rise residential buildings and commercial buildings.
Constant pressure water supply equipment is widely used in central air conditioning, floor heating, industrial closed-loop water circulation, and boiler systems. It integrates automatic pressure stabilization, automatic water replenishment, automatic exhaust, pressure relief and buffering functions. It stabilizes the pressure in the pipeline network, eliminates abnormal sounds caused by air blockage, and prevents damage from negative pressure and water shortage in the pipeline. It is an essential supporting equipment for HVAC and circulating water systems.
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