Ammonia Sampling System with Heat Transfer Cooling
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Solution Overview
Problem
Current ammonia sampling systems face challenges in accurately measuring water content due to the high pressure and low temperature conditions required to maintain ammonia in a liquid state, which can lead to flashing and safety hazards, and existing methods are inefficient and pose safety risks during handling.
Innovation Solution
A sampling system with a fluid distribution subassembly for controlled introduction, drainage, and purging of ammonia and purge gas, using a heat transfer fluid and a heater to evaporate ammonia samples while maintaining safety through automated processes and reduced handling risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ammonia is maintained in liquid state through high pressure and low temperature, then accurate water content measurement is possible, but the ammonia becomes vulnerable to inadvertent flashing to gaseous form during preparation
Solution Approach 1:
The system performs preliminary cooling of the sampling container and ammonia sample before measurement, and preliminary purging to remove moisture. The container is cooled to below ammonia's boiling point temperature before sample introduction, and the system purges with dry nitrogen to eliminate water vapor that would interfere with water content measurement accuracy.
Solution Approach 2:
The system dynamically adjusts temperature and pressure parameters during the sampling and measurement process. The container temperature is controlled to maintain ammonia in liquid state during sampling, then heated to evaporate ammonia for water content measurement. Pressure is regulated to prevent inadvertent flashing while maintaining liquid state for accurate measurement.
2Ease of operation
If manual handling of liquid ammonia is performed for sampling, then sample collection is straightforward, but safety hazards increase due to potential inhalation or skin contact
Solution Approach 1:
The system uses an intermediary automated sampling mechanism where liquid ammonia is transferred through sealed tubing and valves without direct human contact. The sampling container is filled automatically through a sealed interface, and the system uses intermediate nitrogen purging to prevent ammonia leakage during transfer operations.
Solution Approach 2:
The system replaces manual mechanical handling with an automated controlled system using electrically actuated valves, pumps, and temperature-controlled chambers. The sampling process is automated through programmable control sequences that manage valve actuation, temperature control, and sample transfer without requiring operators to manually handle liquid ammonia.
3Measurement precision
If the ammonia sample is allowed to evaporate at high temperature to measure water content, then water content can be determined, but the process becomes time-consuming and energy-intensive
Solution Approach 1:
The system maintains continuous heating at a controlled temperature to evaporate ammonia without interruption. The heater continuously applies thermal energy to the sampling container, ensuring complete evaporation of ammonia while preventing water evaporation. This continuous action eliminates the need for repeated heating cycles and ensures complete moisture determination in a single sustained process.
Solution Approach 2:
The system optimizes the temperature parameter during evaporation, maintaining it below the boiling point of water but sufficient to evaporate ammonia completely. By controlling the temperature in this specific range and maintaining it continuously, the system achieves complete ammonia evaporation and accurate water content determination in reduced time with lower energy consumption compared to high-temperature flash evaporation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables accurate and safe measurement of water content in ammonia samples by maintaining ammonia in a liquid state and reducing handling risks, improving the efficiency and safety of the sampling process.
Implementation Method 1
using a heat transfer fluid and a heater to evaporate ammonia samples while maintaining safety through automated processes
Data Source
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AI summary
A sampling container assembly includes a sample receiving residue tube, a residue tube cap, inner and outer pipes, a container cap, a fixture block, and a supply conduit. The residue tube cap is assembled with the residue tube and defines inlet and outlet ports. The inner pipe has a lower end sealingly mounted to the fixture block and surrounding the residue tube to define an inner cavity for receiving a heat transfer fluid. The outer pipe has a lower end sealingly mounted to the fixture block and surrounding the inner pipe to define an outer annulus, with the container cap sealingly assembled with an upper end of the outer pipe. The supply conduit extends through the fixture block and the outer annulus and is connected with the inlet port of the residue tube cap for providing a sample fluid to the residue tube. The fixture block defines a passage extending to the outer annulus for supplying a chilling fluid to the outer annulus for chilling the heat transfer fluid in the inner cavity.