Flash Evaporator Flow Restriction for Complete GC Vaporization

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Solution Overview

Problem

Existing vaporization methods in gas chromatography face issues with pressure buildup due to sample expansion, leading to condensation of high-boiling components and potential decomposition of temperature-sensitive substances, especially when dealing with small liquid samples.

Innovation Solution

A flash evaporator with a flow restriction device and adjustable flow control mechanism, including an adjustable and fixed flow restrictor, flow meter, and controller, to manage the liquid flow rate before heating, combined with a heat tracing pipe to maintain sample integrity and accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a heating module is used to vaporize liquid sample, then the liquid sample can be vaporized into gas sample, but pressure buildup occurs due to volume expansion

Engineering Contradiction:

Improvevaporization processVSAvoidpressure buildup

Core Design Contradiction:

Device complexityVSStress or pressure

Solution Approach 1:

The flow restriction device is positioned before the heating module to pre-restrict the liquid sample flow rate before vaporization occurs. This preliminary flow restriction prevents excessive gas volume expansion from causing pressure buildup in the system, while still allowing complete vaporization to proceed effectively.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If vaporization temperature is increased to ensure complete vaporization of high-boiling components, then vaporization completeness improves, but temperature-sensitive substances may be decomposed

Engineering Contradiction:

Improvevaporization completenessVSAvoiddecomposition of temperature-sensitive substances

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

Instead of increasing the vaporization temperature to achieve complete vaporization, the system changes the approach by restricting the liquid flow rate before the heating module. This allows the heating module to operate at moderate temperatures that prevent decomposition of temperature-sensitive substances while still achieving complete vaporization through extended residence time and controlled heat transfer.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If an adjustable flow restrictor is used to control liquid flow rate, then flow rate adjustability improves, but service life of the flow restrictor is shortened

Engineering Contradiction:

Improveflow rate adjustabilityVSAvoidservice life of flow restrictor

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

The flow restriction function is divided into two separate components: a fixed flow restrictor that provides base flow restriction and an adjustable flow restrictor that provides fine-tuning control. The fixed flow restrictor handles the majority of the flow restriction work, while the adjustable flow restrictor only needs to make minor adjustments, thereby extending its service life while maintaining flow rate adaptability.

Inventive Principle:

Principle #1Segmentation

4Stability of the object's composition

If a fixed flow restrictor is used to control liquid flow rate, then flow rate consistency improves, but flow rate adjustability is lost

Engineering Contradiction:

Improveflow rate consistencyVSAvoidflow rate adjustability

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The flow restriction system is segmented into a fixed flow restrictor for maintaining consistent base flow and an adjustable flow restrictor for adapting to different flow rate requirements. This segmentation allows the system to achieve both flow rate consistency during normal operation and adjustability when needed, resolving the contradiction between these two requirements.

Inventive Principle:

Principle #1Segmentation

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 solution effectively prevents pressure buildup, ensures complete vaporization, extends the life of flow restrictors, and enhances detection accuracy by maintaining sample integrity and consistency.

Implementation Method 1

heating module, performs flash evaporation on a liquid sample entering the sample inlet to obtain a gas sample

Methodology Applied

Scientific EffectFlash vaporization: Evaporation

Implementation Method 2

flow restriction device disposed in a pipeline between the heating module and the sample inlet, and a restricted flow rate of the flow restriction device is adjustable

Methodology Applied

Scientific EffectFlow restriction: Pressure Drop

Data Source

PatentUS20260063596A1Flash evaporator and gas chromatograph

Publication Date: 2026.03.05 SHIMADZU (CHINA) CO LTD

AI summary

The present disclosure relates to a technical field of analysis, and provides a flash evaporator and a gas chromatograph including the flash evaporator, which can avoid pressure buildup of a sample after vaporization and completely vaporize a sample by a heating module. The flash evaporator is applied to sample pretreatment of a gas chromatograph. The flash evaporator includes a sample inlet, a gas sample outlet, a heating module, and a flow restriction device. The heating module communicates with the sample inlet and the gas sample outlet, performs flash evaporation on a liquid sample entering the sample inlet to obtain a gas sample, and delivers the gas sample to the gas chromatograph through the gas sample outlet. In particular, the flash evaporator also includes the flow restriction device disposed in a pipeline between the heating module and the sample inlet.