CO₂ Recovery Device for Natural Gas Boiler Exhaust
Introduction
The natural gas boiler exhaust CO₂ recovery device is a specialized system for capturing and purifying carbon dioxide from the exhaust gas generated by boilers or heating furnaces that use natural gas as fuel. Its core value lies in efficiently recovering high value-added CO₂ from relatively clean exhaust gases, achieving synergy between energy conservation, emission reduction, and revenue generation.
Basic operating principle
The mainstream technology still adopts the "chemical absorption method", but the process is greatly simplified compared to coal-fired flue gas. The basic principle is:
Exhaust gas pretreatment
The exhaust gas from natural gas combustion (with high temperature, excess air, water vapor, and trace nitrogen oxides) enters the absorption system after waste heat recovery and cooling dehydration.
CO₂ absorption
The exhaust gas enters the absorption tower and comes into countercurrent contact with a specialized amine solution (such as MDEA) sprayed from top to bottom. The amine solution selectively absorbs CO₂, and the purified exhaust gas (mainly nitrogen, oxygen, and water vapor) meets the emission standards.
Solvent regeneration and CO₂ desorption
The "rich solution" adsorbed with CO₂ is heated and sent to the regeneration tower, releasing high-purity CO₂ gas at a lower temperature (about 90-110 ℃), and the lean solution is recycled for use. The sulfur content in natural gas exhaust is extremely low, which avoids solvent poisoning and ensures more stable system operation.
CO₂ refining and liquefaction
The desorbed CO₂ gas is refined through dehydration, dehydrogenation, etc., compressed, cooled and liquefied to obtain high-purity liquid CO₂ products.
Parameter Specifications
|
Production capacity |
Exhaust CO₂ concentration |
Product purity |
Key energy consumption indicators |
CO₂ recovery rate |
|
200 – 2,000 kg/h |
8%–12% (v/v) |
≥ 99.9% (food grade) or ≥99.999% (electronic grade) |
Steam consumption: 1.8-2.5 GJ/ton CO₂ Electricity consumption:~80-120 kWh/ton CO₂ |
≥ 90% |
(For Reference Only)
The economic benefits that can be brought
Direct income
1. Sales revenue of high-purity CO₂: The market price of food grade CO₂ is stable.
2. Carbon trading revenue: The captured CO₂ can form carbon assets.
Cost savings and avoidance
1. Avoiding future carbon costs: Lock in emission reductions in advance to avoid potential carbon taxes/quotas in the future.
2. Value of waste heat utilization: Transforming the waste heat from the original discarded flue gas into a regenerated heat source, saving steam costs.
The status of natural gas exhaust gas recovery is mainly reflected in the following aspects
The core means to achieve carbon reduction. Capturing CO₂ from exhaust gas can achieve carbon source recycling and near zero emissions.
01
Promote the resource utilization of exhaust gas. Establishing good circulation and economic benefits with downstream manufacturers using CO₂.
02
The industrial scale and technological maturity continue to improve. At present, this technology has a trend of transitioning from demonstration to large-scale application, and the technology is constantly iterating and becoming increasingly mature.
03
Strong driving force of international policies and market mechanisms. The collective goal of carbon neutrality.
04
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