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频道帖子
| 2 | PFD vs P&ID: What’s the Difference?
A Process Flow Diagram (PFD) and a Piping & Instrumentation Diagram (P&ID) describe the same process at very different levels of detail.
A PFD gives you the overall process picture. It shows the major equipment, main process streams, flow direction, and important operating conditions such as pressure, temperature, and flow.
A P&ID takes you deeper into how the plant is actually connected, controlled, and operated. It typically shows:
• Process and utility piping
• Pipe sizes, line numbers, and specifications
• Manual and control valves
• Instruments and their tag numbers
• Control loops and signal connections
• Pumps, vessels, exchangers, and other equipment
• Drains, vents, bypasses, and other piping details
• Safety and shutdown instrumentation where applicable
Think of it this way:
PFD = What the process does and where it flows.
P&ID = How the process is piped, measured, controlled, and protected.
For an instrumentation technician or engineer, the P&ID is one of the most important drawings in the plant. It helps you trace instruments, understand control loops, identify process connections, troubleshoot faults, and prepare for maintenance or commissioning work.
If you were given only one drawing before going into the field, PFD or P&ID, which would you choose? | 343 |
| 3 |  没有文字... | 298 |
| 4 | Proper distributor design, packing selection, and solvent choice are the three most important factors in achieving maximum gas removal efficiency while minimizing pressure drop and operating costs.
#AbsorptionTower #GasAbsorption #PackedTower #MassTransfer #ChemicalEngineering #ProcessEngineering #IndustrialEquipment #EnvironmentalEngineering #ScrubberSystem #AirPollutionControl #OilAndGas #Refinery #ProcessIndustry #EngineeringKnowledge #EngineeringWorld | 339 |
| 5 | Absorption Tower Overview:
An Absorption Tower (also called an Absorber Column or Scrubbing Tower) is a mass transfer equipment used to remove unwanted gaseous components from a gas stream by dissolving them into a liquid absorbent. These towers are extensively used in chemical plants, refineries, fertilizer industries, power plants, and environmental protection systems.
By maximizing gas-liquid contact, absorption towers efficiently remove pollutants, recover valuable chemicals, and improve process performance.
⚙️ What is an Absorption Tower?
An Absorption Tower is a vertical vessel where a gas mixture comes into contact with a liquid solvent. The target gas component transfers from the gas phase into the liquid phase due to concentration differences, resulting in purified gas leaving the tower.
Commonly absorbed gases include:
✔ Ammonia (NH₃)
✔ Sulfur Dioxide (SO₂)
✔ Hydrogen Sulfide (H₂S)
✔ Hydrogen Chloride (HCl)
✔ Carbon Dioxide (CO₂)
✔ Chlorine (Cl₂)
---
🔍 Major Components and Their Functions
🔹 Gas Inlet
Introduces contaminated gas into the bottom section of the tower.
🔹 Liquid Inlet
Feeds absorbent liquid into the top section.
🔹 Liquid Distributor
Ensures uniform distribution of absorbent across the packing.
🔹 Packed Bed
Provides large surface area for efficient gas-liquid mass transfer.
🔹 Redistributor
Prevents liquid channeling in tall towers and improves efficiency.
🔹 Support Grid
Supports packing material while allowing fluid flow.
🔹 Demister Pad
Removes entrained liquid droplets from the exiting gas.
🔹 Clean Gas Outlet
Discharges treated gas after absorption.
🔹 Rich Liquid Outlet
Removes absorbent containing absorbed contaminants.
🔹 Manway
Provides maintenance and inspection access.
🔹 Column Shell
Contains all internal components and process fluids.
🔹 Skirt Support
Transfers vessel load to the foundation.
---
🔄 Working Principle
1️⃣ Gas Entry
Contaminated gas enters from the bottom of the tower.
2️⃣ Solvent Distribution
Absorbent liquid enters from the top and spreads uniformly through the packing.
3️⃣ Counter-Current Contact
Gas flows upward while liquid flows downward.
This arrangement provides maximum contact efficiency.
4️⃣ Mass Transfer
Target gas molecules transfer from the gas phase into the liquid absorbent.
The packing creates a large wetted surface area, enhancing absorption.
5️⃣ Mist Removal
The gas passes through a demister pad where liquid droplets are removed.
6️⃣ Clean Gas Exit
Purified gas leaves through the top outlet.
7️⃣ Rich Solvent Collection
The absorbent containing dissolved contaminants leaves through the bottom outlet for regeneration or disposal.
---
🌟 Key Advantages
✅ High gas removal efficiency
✅ Continuous operation
✅ Low operating costs
✅ Excellent mass transfer performance
✅ Suitable for large gas flow rates
✅ Can recover valuable chemicals
✅ Effective for corrosive gases
✅ Environmentally friendly pollution control method
---
🏭 Industrial Applications
⚗️ Chemical Plants
Removal and recovery of process gases.
🛢️ Oil & Gas Industry
H₂S and CO₂ removal from natural gas streams.
🌱 Fertilizer Plants
Ammonia absorption and recovery systems.
🔥 Power Plants
Flue gas desulfurization (SO₂ removal).
🏭 Steel & Metallurgical Industries
Acid gas treatment and emission control.
♻️ Environmental Systems
Air pollution control and odor removal.
💊 Pharmaceutical Plants
Solvent vapor recovery and gas purification.
---
📊 Factors Affecting Absorption Efficiency
🔸 Gas flow rate
🔸 Liquid flow rate
🔸 Packing type and surface area
🔸 Tower height
🔸 Operating temperature
🔸 Operating pressure
🔸 Solvent selection
🔸 Gas-liquid contact time
---
💡 Engineering Insight
The efficiency of an absorption tower depends heavily on the quality of liquid distribution. Even premium packing materials cannot perform effectively if the absorbent is unevenly distributed. | 325 |
| 6 |  没有文字... | 232 |
| 7 | 没有文字... | 571 |
| 8 | Lorsqu’on arrête une pompe et qu’on remarque qu’elle commence à tourner en sens inverse, qu’est-ce que cela signifie selon vous ? | 501 |
| 9 | Quel type de Quiz préférez-vous ? | 473 |
| 10 | Quel isomère du xylène cristallise en premier lors du refroidissement ? | 532 |
| 11 | Pourquoi la séparation des isomères du xylène est-elle difficile ? | 463 |
| 12 | Quel procédé industriel est le plus utilisé pour récupérer le para-xylène ? | 369 |
| 13 | Un point de rosée plus faible que la température ambiante signifie : | 385 |
| 14 | Dans un système d’air instrument, un point de rosée très bas signifie généralement : | 396 |
| 15 | Pourquoi le surge est-il considéré dangereux mécaniquement ? | 406 |
| 16 | Dans un système anti-surge, la vanne de recycle s’ouvre principalement pour : | 369 |
| 17 | Le surge d’un compresseur est principalement causé par : | 393 |
| 18 | Le surge (pompage) est observé principalement dans : | 468 |
| 19 | Quel facteur favorise la cavitation ? | 581 |
| 20 |  و عليكم السلام ، نعم مزال يحتاجو الدم .
و مش لازم اليوم ، بصح في أقرب وقت .
"لي حابين يتبرعو يروحو للسبيطار لل cac (مركز محاربة السرطان في الطابق الثالث) يقولولهم حابين نتبرعو للمريضة : قندور الزاوية ، يعمرو ورقة يمدوهالهم من بعد يروحو لمصلحة نقل الدم جاية لتحت
مين تولي داخلة للمستشفى على يدك اليمنى تبعي طريق السيارات يلقاوها لتم"
و بارك الله فيكم ❤️ | 217 |
