Acid Gas Regenerator Condenser Corrosion Prevention
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Solution Overview
Problem
Current acid gas removal methods face challenges with corrosive substances like NH3, H2S, and HCN accumulating in condensed water, leading to increased costs for absorbent replacement, treatment, and facility installation, as well as increased heat requirements for evaporation in regenerators.
Innovation Solution
An acid gas removal device and method that includes a regenerator condenser with a gas-liquid separator and reflux system to separate and recycle corrosive substances, mixing regenerator condensed water with lean solution to reduce corrosive substance concentration, and incorporating a cleaning unit to reuse wash water, thereby reducing corrosive substance accumulation and heat input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If condensed water containing corrosive substances is purged from the regenerator, then corrosion of device materials is reduced, but absorbent components are lost and treatment costs increase
Solution Approach 1:
The patent introduces a washing solution as an intermediary substance that absorbs corrosive components from condensed water. The washing solution circulates through the regenerator, picking up corrosive substances without requiring direct discharge of condensed water, thus preventing corrosion while retaining absorbent components in the system.
Solution Approach 2:
The patent recovers corrosive substances from condensed water by having them absorbed into the washing solution. Instead of discarding the condensed water and losing absorbent components, the system recovers the corrosive substances through the washing solution, which can then be treated separately while the absorbent is retained and reused.
2Object-affected harmful factors
If additional facilities are installed to remove corrosive substances upstream, then corrosion is prevented, but facility costs and system complexity increase
Solution Approach 1:
The washing solution system performs multiple functions: it washes the gas stream in the absorber, condenses moisture in the regenerator, and simultaneously removes corrosive substances from condensed water. This multi-functionality eliminates the need for separate dedicated facilities for each function, reducing overall system complexity while maintaining effective corrosion prevention.
Solution Approach 2:
The patent merges the corrosion prevention function with the existing gas cleaning and condensation processes. The washing solution that already circulates through the system is also used to absorb corrosive substances from condensed water, combining multiple protective functions into a single integrated system rather than requiring separate facilities.
3Object-affected harmful factors
If corrosive substances are stripped from condensed water, then corrosion is reduced, but additional processing requirements and costs increase
Solution Approach 1:
The washing solution system performs self-service by automatically absorbing corrosive substances from condensed water as it circulates through the regenerator. The system uses its own circulation mechanism to pick up corrosive components without requiring external stripping facilities or additional processing equipment, thereby reducing complexity while achieving corrosion prevention.
4Productivity
If NH3 is continuously absorbed into lean solution in the absorber, then acid gas removal efficiency is maintained, but NH3 accumulates in condensed water in the regenerator
Solution Approach 1:
The washing solution acts as an intermediary that intercepts NH3 before it accumulates in condensed water. As the washing solution circulates through the regenerator, it absorbs NH3 from the condensed water phase, preventing NH3 buildup while allowing the main acid gas removal process in the absorber to continue at full efficiency.
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
This approach reduces corrosive substance concentration in regenerator condensed water, prevents corrosion, and decreases the need for additional treatment and facility costs by reusing absorbent and minimizing heat input.
Implementation Method 1
a regenerator condenser that condenses moisture from entraining gas entraining the corrosive substance and the acid gas and discharged from the column top portion of the regenerator
Implementation Method 2
a cooler interposed in the gas discharge line
Implementation Method 3
a gas-liquid separator that separates the acid gas from regenerator condensed water obtained by condensing vapor using the cooler
Implementation Method 4
a reflux line that refluxes the regenerator condensed water to a condensed water introducing unit installed closer to the column top portion than the rich solution introducing unit
Implementation Method 5
a first condensed water extraction line that extracts the regenerator condensed water from a condensed water extractor of the condensed water receiver, and that is connected to the lean solution supply line
Data Source
AI summary
An acid gas regenerator includes a regenerator condenser that condenses moisture from entraining gas entraining a corrosive substance and acid gas discharged from a column top portion of a regenerator that regenerates acid gas absorbent. The regenerator condenser includes: a gas discharge line that discharges the entraining gas from the column top portion of the regenerator, a cooler installed on the discharge line; a gas-liquid separator that separates CO2 gas from regenerator condensed water obtained by condensing vapor using the cooler, a reflux line that refluxes the regenerator condensed water closer to the column top portion than the rich solution introducing unit; a condensed water receiver storing the condensed water introduced by the reflux line; and a first condensed water extraction line that extracts the condensed water from a condensed water extractor of the condensed water receiver and is connected to a lean solution supply line.