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Water treatment papers sewage treatment papers
Pure water making system in "power plant chemical water treatment" teaching application
Abstract: the "power plant chemical water treatment" course practice-needed, mostly about equipment the principle, structure and operation content, students lack the perceptual knowledge is hard to understand. Based on pure water making system, integrating with treatment for model design teaching some teaching links, can help students grasp the plant water treatment common equipment, the structure and operation will help students understand water treatment equipment operation, the detailed process of water treatment teaching played a positive role in promoting.
Keywords: power plant chemical; Water treatment; Pure water system; Teaching design
Power plant chemical specialty is Harbin power professional technology institute (hereinafter referred to as "our", the traditional professional training to adapt to the national electric power industry to develop professional water treatment talents, and as its professional class "power plant chemical water treatment" teaching is particularly important.
"Power plant chemical water treatment" is the core of plant chemical professional course of, because this course practice-needed, water purification content speaking, mostly about equipment the principle, structure and operation of content. Because the students lack of site equipment and environment of perceptual knowledge, is hard to understand and control. How to let the students learning process have image, the specific understanding is the urgent need to resolve problems. Our professional introduced ultra-pure water plant chemical preparation system, as a model of water treatment imitation of coal-fired power plants producing process. On the one hand may undertake to the student the theoretical and practical teaching, help students understand water treatment equipment operation detailed process, operation and troubleshooting; On the other hand the system obtained for laboratory use, pure water also reduced the cost of distilled water laboratory purchasing.
A, pure water making system profile
Our professional USES is plant chemical UPDROMB - a company 500L pure water supply system, produce a water yield for 500 L/h, its main water purification process as shown in figure 1 below.
Main outlet index resistivity p, ¦¸ 18M cm (25 ¡æ); More than 20 mu g/SiO2, accord with boiler water supply requirements L.
Second, pure water making system in "power plant chemical water treatment" teaching application
1. Pure water system of raw water quality analysis and teaching, combining simulation analysis of raw water quality power
This pure water system USES object of groundwater, use water quality analysis experiment of groundwater index of the tests and simulation analysis of raw water quality on plant is under construction, since laboratory, can carry out regular project see table 1. Specific sampling location for raw water tank, in system add 5 place sampling points on major projects, the tests. Strictly according to GB/T 2005 -- 6903 boiler water and cooling water analysis method general rules and coal-fired power plants the method of water vapor analysis method were determined.
2. Pure water system pretreatment and teaching union
(1) pretreatment system selection and teaching union. At present, coal-fired power plants supply water basically is: pretreatment technique and flocculation - clear filtration. Combined with pure water making system, inspire the student to thinking, our pretreatment why such Settings? Can combine with coal-fired power plants the contents of chemical design specification and explain, on the choice of the system, design problem with inspire students learned thinking. For instance this system, aiming at what defect pretreatment of how this defect improvement.
Combined with the existing pure water making system of comparing pretreatment technique teaching. This system USES is quartz sand filter and activated carbon filter, according to the characteristics of groundwater is raw, iron, manganese metal ions in the design more less for removing iron filter, this problem lets student to discover and summarized. Students learn after pretreatment system selection requirements, natural easily found the design problem. If without removing fe filter, can also how the? Some students advice, the quartz sand filter transformed into the iron filters, namely except quartz sand filter material change for manganese sand filter material; Some Suggestions in the original flow increases for removing iron filter, such inspire students to reach the goal, but also improves students' ability to analyze and solve problems.
(2) in the process of pretreatment main equipment operation and fault handling and teaching union. The operation of equipment and troubleshooting always all is water treatment the emphasis of teaching, to the system as an example, the pretreatment of main equipment is quartz sand filter and activated carbon filter, and these two devices are the most important plant chemical two devices. Combined with the existing quartz sand filter in the following projects: pressure measurement; The flow measurement; The granularity of quartz sand filter material selection and loading, according to screening analysis method choice in 0.35 ~ 3.0 size range of quartz sand filter material as mm, lets student screening and reload; Operation and index supervision. Failure supervision: according to the effluent turbidity and inlet and outlet water pressure difference between two major supervision, combining with laboratory quartz sand filter index, we have developed the water outlet pressure measurement; Through the water and the turbidity water measuring mathematical calculation and comparison, and calculation out turbidity rate. Reverse-wash and positive wash: wash in reverse-wash and is in the process of teaching, the students themselves through the experimental grope for best reverse-wash water and time.
Carry out projects in above, require students to make good data records. By the student experiment fumble, let them personally sure quartz sand filter and its operation, the optimum condition of the teaching effect is good.
3. The desalination technology mainly equipment operation and fault handling and teaching union
(1) the desalination system selection requirements and teaching union. This system USES the desalination system for RNa - level, RO - level 2, RO - H/OH; According to the characteristics of groundwater hardness big, using a softening device, reverse osmosis desalting as secondary gets mixed bed, polishing, this system as a terminal treatment effluent can be used as a laboratory water. Inspire students to think about why choose such systems, can combine with coal-fired power plant chemical make-up water salt design part about except for teaching, both intuitive perceptual knowledge, and can let students quickly gain coal-fired power plants in addition to salt design some basic requirements and precautions. The desalination system in addition the typical process for: H > C > OH - H/OH, can compare teaching, guides the student to think two processes, so that they can combine differences of pure
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