6Color code Black color ring Black color ring
Aluminum white
Remarks:
12.5MPa aluminum cylinders, the State Quality and Technical Supervision of the filling factor given by the State 0.6. Cylinders should be inspected before filling cylinder, valves, accessories intact, and check whether it is after the annual inspection. Calculation of cylinder filling quantity: W=FV W: filling quality of cylinder, kg; F: filling coefficient of cylinder, kg/L; V: effective volume of cylinder, L. 4 Carbon dioxide filling system According to the nature of carbon dioxide and the storage conditions, the filling system is designed as follows: Fig. 1 Carbon dioxide filling system Selection of components: 4.1 Pipeline Liquid carbon dioxide transmission pipeline should be used for stainless steel seamless steel pipe to avoid the use of carbon steel seamless steel tube, and avoid the use of carbon steel seamless steel pipe, and avoid the use of carbon steel seamless steel pipe. Seamless carbon steel pipe should be used to avoid corrosion of the pipe, the diameter of the pipe should be determined according to the output, and the wall thickness of the pipe should be calculated to withstand the pressure of more than 10MPa. When installing the pipe, use argon arc welding, single-sided welding and double-sided molding, after the welding is completed, carry out the blowing treatment, and the outer wall of the pipe should be insulated with polyurethane foam.4.2 Charging pump The plunger pump with larger output pressure can be used, and the maximum working pressure should not be less than 10MPa, and the flow rate of the pump should be determined according to the output, and the sealing of the plunger pump should be used with PTFE packing if the carbon dioxide is used in the food industry, and the pump should work with a small amount of carbon dioxide and allow it to work. When the pump is working, a small amount of carbon dioxide gas leakage is allowed (conducive to cooling).4.3 Pneumatic ball valve is used for automatic control of the filling switch, the valve body should be made of stainless steel, when used in the food industry, the material of the valve should have good corrosion resistance, such as 304 or 316 stainless steel.4.4 Angle valve is used for gas discharge in the pipeline before and after filling. 4.5 safety valve spring-loaded safety valve, select the working pressure of 10MPa, as required by the pressure vessel inspection department for regular calibration. 4.6 electronically controlled pressure gauge display pipeline working pressure and overpressure alarm and emergency stop # 41# Henan Chemical Industry May 2010, Vol. 27, No. 5 (below) HENANCHEMICALINDUSTRY
Control, should be calibrated regularly in accordance with the provisions of the 4.7 control system The gas filling volume of the gas cylinders is controlled by the electronic scale, with a control accuracy of more than 20g, and it can be automatically tare and linked with the control system to control the filling volume of gas cylinders. Linkage with the control system to control the opening and closing of the filling valve. Control box panel should be set up emergency stop switch, set up alarm buzzer in the box, the system overpressure, can automatically alarm and cut off the pump, close the emergency stop pneumatic ball valve.5 The use of the system The design and installation of the system is based on the use of gas cylinders in the enterprise and put forward, before the cylinder filling, need to be transported by the vehicle to the field for filling, not only need to invest in manpower and materials, but also can't guarantee that the time cylinders timely supply. Timely supply of cylinders. After the filling equipment was built, it passed the certification of the pot inspection institute, and has been used normally for several years, and the quantity of bottles loaded has reached more than 40,000 bottles, which saves a lot of transportation and time costs for the enterprise. References [1] Zhang Xinjian, Zhang Zhaojie. Gas cylinder filling safety technology.
Huanghe Water Conservancy Press (continued from page 38) water sludge and domestication culture. First / boring aeration 0 three days, and then according to the actual situation, into a small amount of water, gradual aeration, and then add chicken manure and pig manure and other nutrients. After seven days, there are active sludge began to form and gradually increase. 5 Conclusion The use of CASS process to treat ammonia industrial wastewater, can ensure good nitrogen removal and removal of organic matter effect, and covers a small area, effectively save investment, reduce operating costs, coupled with the use of computer networking and advanced PLC control system, reducing the manual operation of a variety of accidental errors, improve the overall workflow efficiency. The efficiency of the whole workflow is improved. References [1] Zhang Tong, Hou Ruiqin, Wang Shouzhong. Intermittent activated sludge method - sewage treatment engineering examples [M]. Beijing:Chemical Industry Press,2008
. (Continued from page 39) Some oil sludge treatment technologies such as foam flotation, hydrolysis, electrolysis and other technologies are currently under research. References [1] Huang Wusheng, Chang Wenxing. Recovery of crude oil from oily sludge[J] Environmental Protection Science, 2001,(02)
. (continued from page 40)4 The use of standard substances 4.1 Standard substances must be used within the validity period Generally speaking, the validity period is the developer of the standard substance will be in the specified storage conditions, the stability of the stability test proved that the characteristics of the value of the interval as the validity period of the standard substance. Stability test can only show that the time has been tested is stable, beyond the expiration date of the stability of the situation can not be determined. The stability of some samples is far more than the nominal validity period, potassium dichromate reagent is also very stable, subject to storage conditions, its characteristics of the quantitative value of the slow decline in the trend. Some standard substances are very easy to change, such as ammonium ferrous sulfate standard solution concentration in a week there are obvious changes. Most of the chemical analysis with the standard sample is required to configure the use, even if it is strictly in accordance with the instructions for the configuration and use, the preparation process, the use of the medium (solvent) type and concentration of the stability of the standard working solution are affected, volumetric analysis and testing should pay attention to monitoring the changes in the standard substance, such as standard solutions should be calibrated within the validity period of the concentration, and at the same time to collect the relevant information to accumulate experience. Analytical testing in the drawing of the working curve, should be used as far as possible standard solution or standard gas preparation of the working standard. Use standard samples for quality control as much as possible in daily frequency analysis and testing. Analysis is difficult to collect parallel samples for quality control of the project, such as suspended solids, oil, etc., should always use the standard samples for control. 4.2 Uncertainty of the standard substance uncertainty is the dispersion of the value of the measurement, the uncertainty of different standard substances of the value of its uncertainty is also different, the value of its synthetic uncertainty of the value of the characteristics of the standard samples may be derived from the inhomogeneity of the standard samples, the uncertainty of the value of the method, the uncertainty of the parallel samples and control samples, the uncertainty of the standard samples, the uncertainty of the standard samples and the control samples. Uncertainty of parallel and control samples. The uncertainty level of the standard sample should be negligible in relation to the uncertainty level required for the analytical result and should be taken into account when selecting the standard. 4.3 Traceability of standards Traceability is the property that enables the results of measurements to be related to a defined reference standard, usually a national or international measurement standard, by means of an unbroken chain of comparisons with a defined degree of uncertainty. A characteristic that enables a measurement to be linked to a defined reference standard, usually a national or international measurement standard. The China National Accreditation Board for Laboratories (JAI) requires that when a laboratory uses a Reference Standard for a measurement, the Reference Standard must be traced back to the SI measurement unit or to a certified Reference Standard, whenever possible, and the Accreditation Board recognizes certified Reference Standards supplied by an organization that has been approved by the metrological administrative department of the State Council. Many chemical analysis results are dependent on the traceability of the standard substance, the laboratory should pay attention to the purchase of standard substances should be able to prove its certificate of traceability to the national measurement reference. Some standard substances can not provide certificates traceable to the national benchmark, such as some large-scale instrumentation randomly brought for standardization of the standard; there are also some standard substances can not be traced back to the certificate of the required measurement benchmark (national or international measurement standards), such as some of the imported equipment randomly brought with the certificate of the standard can not prove its traceability. There are also some standard substances due to the physical and chemical properties of the sample to be measured are different, such as lumps and particles, solid and liquid, matrix does not match, etc., although the traceability of the standard substances can meet the requirements, but the traceability of the analytical results will be affected. In some analytical processes, the traceability of standard substances is not very important, such as the recovery rate to examine the accuracy of an analytical method.5 Preservation of standard substances Standard substances should be stored in a special place, be clearly identified, and by the analytical laboratory is responsible for the custody of the analytical laboratory should be formulated to list the standard substances of the analytical laboratory, solid substances, such as the benchmark reagent should be stored in closed containment, the cylinder of the standard gas should be fixed with a metal chain. Standard gases in cylinders should be fixed with metal chains. When the standard substance certificate or instructions on the storage requirements (such as light, low temperature, etc.), should be stored in accordance with the specified requirements. Once the expiration date of the standard substance is exceeded, it must be immediately cleaned up and appropriately labeled, and must not be used further. Thus, the standard substances stored in the analytical laboratory can ensure the accuracy of the analytical test results. # 42# Henan Chemical Industry HENANCHEMICALINDUSTRY May 2010, Volume 27, Issue 5 (Lower)