【Test Your Knowledge】Basic Chemical Engineering Knowledge (34)
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For the convenience of others, please write down the answers directly; do not paste the original questions, otherwise no marks will be given. Thank you for your cooperation! 1. When switching between pump units, the _________ unit should be started first, and then the _______ unit should be stopped. 2. When the gas is condensed in the heat exchanger, ________ should enter first, and __________ should enter later. 3. During the evaporation process, it is necessary to continuously _________ and remove ______________. 4. When starting a single-stage centrifugal pump, it is necessary to close ____________ in order to prevent the motor from being _________ due to excessive ___________, which could damage the motor. 5. When heating a certain oil with steam, the steam should flow through the _______ of the heat exchanger, while the oil should flow through ________. 6. Parallel-flow feeding multi-effect evaporation is suitable for those solutions whose viscosity increases significantly as ________ rises and ________ decreases. 7. In areas where the concentration of toxic gases exceeds ________ of the total, the use of various filter-type gas masks is prohibited. 8. Safety work must adhere to the “four comprehensive management” principles of _______, ________, _______, and ________. 9. The property whereby the zero point and indication of a gauge change over time is called _________, and it is mainly caused by _____ and ________ among other factors. 10. The velocity of the fluid inside a pipe is, under normal conditions, highest at ________, decreases as one moves closer to the pipe wall, and is ________ at the pipe wall. Answer key: 1. Backup, operation 2. Cold fluid, condensed steam 3. Supply heat, vaporized steam 4. Outlet valve, starting power, burnout 5. Shell side, tube side 6. Concentration, temperature 7. 2% 8. All staff, entire process, in all aspects, around the clock 9. Unstable, wear and tear, deterioration 10. Pipe centerline, smaller, equal to zero. Last edited by zhangyong6404 on 2009-4-17 13:17.]
1. Standby mode operation； 2. Heated medium Heating medium ； 3. Moisture supply – non-condensing gas ； 4. Outlet valve: damaged due to excessive load. 5. Pipe side, shell side ； 6, 7, 8, 9 – can’t do it ； 10. The smaller the center, the smaller it is
1. Standby pump, in-use pump. 2. Cold fluid, steam 3. Heating, discharge of secondary steam 4. Pump outlet, current, burnout 5. Shell side, tube side 6. Concentration, temperature 7. 15% 8. Whole process, in all aspects, around the clock, across society 9. Zero drift, aging, wear 10. Pipe center, smaller value, zero
Backup operation； Material Heat Transfer Medium ； Moisture replenishment, non-condensing gas ； Export load too high: burnout of the tube side and shell side ； Temperature Concentration 30% No No Center Small 0
1: Backup； Host 2: Heating substance ； Steam 3: Heat ； Discharge of condensed gas 4: Pump outlet ； Current ； Burned out 5: Tube side, Shell side 6: Concentration, temperature 7: 15% 8: All personnel, in all aspects. Throughout the entire process, around the clock: 9: Migration, aging, and wear; 10: The smaller the center, the better
1. Standby pump, online pump 2. Cold fluid, steam 3. Heating, discharge of secondary steam 4. Pump outlet, current, burnout 5. Shell side, tube side 6. Concentration, temperature 7. 15% 8. Whole process, in all aspects, around the clock, across society 9. Zero point shift, aging, wear 10. Pipe center, smaller, zero
1. Standby operation 2. Cold fluid, Hot fluid 3. Water supply, Exhaust 4. Outlet valve, Load, Damage 5. Tube side, Shell side 6. Viscosity, Temperature 7. 2% 8. All staff, Entire process, Comprehensive, Around the clock 9. Cannot 10. Pipe center, Lower the value to zero
1. Standby pump, operating pump. 2. Cold fluid, steam 3. Heating, discharge of secondary steam 4. Pump outlet, load, damage 5. Shell side, tube side 6. Concentration, temperature 7. 15% 8. Total quality management, entire process involvement, participation by all employees, comprehensive application of various effective modern management methods 9. Zero point shift, aging, wear 10. Pipe center, smaller value, zero
1. Standby, operating 2. Cold fluid, substance to be condensed 3. Heating, vaporizing gas 4. Outlet valve, current, damage 5. Shell side, tube side 6. Concentration, boiling point 7. 2% 8. All personnel, entire process, in all aspects, around the clock. 9. Zero-point migration, aging, wear 10. Pipe center; the smaller the value, the closer it is to zero
1. Standby operation 2. Cold fluid, hot fluid 3. Heat transferred, vaporized steam 4. Water outlet valve, current, burnout 5. Tube side, shell side 6. Concentration, temperature 7. 0.15% 8. All personnel, entire process, in all aspects, around the clock 9. Instability, wear and tear, degradation 10. Pipe centerline, smaller, equal to zero Last edited by zyzsd on 2009-4-16 18:14]
1. Standby mode operation； 2. Heated medium Heating medium ； 3. Heating: Vaporized steam ； 4. Outlet valve: damaged due to excessive load. 5. Shell side, tube side. 6. Temperature, pressure. 7. 0.15%. 8. All personnel, throughout the entire process, in all aspects, 24/7. 9. Zero-point drift, aging, wear and tear. 10. Pipe centerline: the smaller the value, the better; zero is ideal:
1. When switching between pump sets, the _backup_ unit should be started first, followed by shutting down the _normal_ unit. 2. When condensing gas in a heat exchanger, the _cold fluid_ should be introduced first, followed by the _hot fluid_. 3. During the evaporation process, it is necessary to continuously _heat__ and remove __steam__. 4. When starting a single-stage centrifugal pump, the __exit valve__ should be closed to prevent the motor from being __damaged__ due to excessive __current__. 5. When heating a certain oil with steam, the steam should flow through the __shell side__ of the heat exchanger, while the oil should flow through the _tube side__. 9. The property whereby the zero point and indication of instruments change over time is called _drift_, which is mainly caused by factors such as _temperature_ and _air pressure_. 10. The velocity of the fluid within a pipe is, under normal conditions, highest along the __axis__; it _decreases_ as one moves closer to the pipe walls, and the velocity at the pipe walls is _zero__.
1. Standby pump, operating pump 2. Cold fluid, steam 3. Heating, discharge of secondary steam 4. Pump outlet, current, burnout 5. Shell side, tube side 6. Concentration, temperature 7. 2% 8. Whole process, in all aspects, around the clock, across society 9. Zero point shift, aging, wear 10. Pipe center, smaller, zero
1. Standby, running. 2. Cold fluid, steam 3. Heating, condensate. 4. Outlet valve, motor, motor starting power. 5. Shell layer, tube side. 6. Concentration, temperature. 7. 2% 8. All staff, in all aspects, throughout the whole process, around the clock. 9. Instability, wear, degradation. 10. Pipeline centerline: the smaller the value, the better; it can be zero_.
1. Standby operation 2. Cold fluid, hot fluid 3. Heat, secondary steam 4. Outlet valve; excessive current can damage the motor 5. Tube side, shell side 6. Temperature, concentration 7. 2% 8. Make comprehensive use of various effective modern management methods by all personnel, throughout the entire process, around the clock, and in a holistic manner 9. 10. The smaller the center, the better 0
1. Standby, in operation 2. Cold fluid, hot fluid 3. Liquid injection, gas 4. Outlet valve, current, burnout 5. Shell side, tube side 6. Concentration, temperature 7. 2% 8. Comprehensive training, all-round safety management, full-process management, round-the-clock monitoring 9. Zero drift, pressure, temperature 10. Axis, the lower, the better; zero
1. When switching between pump units, the _backup_ unit should be started first, followed by shutting down the _operating_ unit. 2. When condensing gas in a heat exchanger, the _cold fluid_ should be introduced first, followed by the _hot fluid_. 3. During the evaporation process, it is necessary to continuously _provide heat energy and remove_ water. 4 When starting a single-stage centrifugal pump, the _exit valve_ should be closed to prevent the motor from being __damaged__ due to __excessive load__. 5. When heating a certain oil with steam, the steam should flow through the _shell side_ of the heat exchanger, while the oil should flow through the _tube side_. 6. Parallel-flow feeding multi-effect evaporation is suitable for those solutions whose viscosity increases significantly as the _concentration_ rises and the __temperature__ drops. 7. In areas where the concentration of toxic gases exceeds __0.2__ of the total volume, the use of various filter-type gas masks is prohibited. 8. Safety work must adhere to the “four comprehensive management” principles of _______, ________, _______, and ________. 9. The property whereby the zero point and indication of a gauge change over time is called _________, and it is mainly caused by _____ and ________ among other factors. 10. The velocity of the fluid within a pipe is, under normal conditions, highest at the __center__; the velocity decreases as one moves closer to the wall of the pipe, and it is _0_ at the wall itself. This post was last edited by bbsking on 2009-4-16 23:08]
1. Switch the pump motor； Motor that drives the pump. 2. Cold operating fluid ； Steam or hot working fluid. 3. Transfer heat ； Vaporized steam. 4. Outlet valve, starting power ； Burned out. 5. Shell side (between tubes), tube side (inside tubes). 6. Temperature ； Concentration. 7, 2%. 8. All employees ； The entire process ； All-round ； 24/7. 9. Unstable ； Wear ； Deterioration. 10. Pipeline centerline ； Smaller ； It equals zero.
1. Standby pump, in-use pump. 5 f2 a3 B+ X) y# }% r) X; o/ \ 2. Cold fluid, steam + S0 b6 h6 o3 O) H, ~3. Heating, discharge of secondary steam 5 Y( p1 C" _( A& @4 J3 J4. Pump outlet, current, burnout/ P. W q+ c- w* ^ 5. Shell side, tube side 0 i1 {' @& M$ R& a& p6. Concentration, temperature* R+ J1 Q, n6 }$ F! _! r, u 7. 15% 0 y' x( g+ ?6 I/ p% ?' h8 e+ C8. Whole process, in all aspects, around the clock, across society a% m% X L5 ~; O 9. Zero drift, aging, wear 3 `" N8 A8 R: m 10. Tube center, smaller value, zero
9. The velocity of the fluid within a pipe is, under normal conditions, highest at ________, decreases as one moves closer to the pipe walls, and is ________ at the pipe walls. Backup, operation with cold material, hot material feeding, product outlet valve, starting current, tube side burnout, shell side pressure, temperature. 10% deviation across all personnel, throughout the entire process, in all aspects, and around the clock; the smaller the value, the better. 0
1 Backup, in operation 2 Cold material, hot material 3 Feed, product 4 Outlet valve, starting current, burnout 5 Tube side, shell side 6 Pressure, temperature 7 10% 8 All personnel, entire process, all aspects 9 Zero point shift, aging, wear 10 Center, smaller, minimum