Renewable Energy

Nitrogen (N2) is an important gas with various applications, including food packaging, electronics manufacturing, and oil and gas extraction. N2 can be obtained through various processes, and one of the most common methods is the Pressure Swing Adsorption (PSA) process. PSA is a well-known technique used in various industries to separate different gases from a gas mixture based on their adsorption properties. In this article, we will discuss the N2 production using the PSA process in detail, with references to relevant research studies. Overview of the PSA Process: The PSA process consists of two adsorption beds filled with a specific adsorbent material such as activated carbon, zeolite, or molecular sieves. The gas mixture containing N2 and other gases (such as oxygen, carbon dioxide, and water vapor) is fed into one of the adsorption beds, and the adsorbent material selectively adsorbs the other gases, leaving behind a pure N2 stream. The bed that was in use is then depressurized, al...

Both thermal oxidizers and flares are used in industrial processes to control and reduce emissions of volatile organic compounds (VOCs) and hazardous air pollutants (HAPs). However, they have different functions and are used in different situations. A thermal oxidizer is a pollution control device that uses high temperatures to convert VOCs and HAPs into carbon dioxide and water vapor. It is a combustion device that operates at high temperatures and is designed to burn off these pollutants. Thermal oxidizers can be used for a wide range of industrial processes and are particularly effective in treating emissions from processes that produce low to moderate concentrations of VOCs. A flare is also a combustion device, but it is primarily used for emergency situations where excess gases need to be safely disposed of. Flares are typically used to burn off excess or waste gases that cannot be safely used in other parts of the industrial process. Flares are often seen at oil refineries and ch...

Renewable natural gas (RNG) is a type of biogas that is produced from the decomposition of organic matter such as landfill waste, animal waste, or agricultural waste. RNG can be upgraded to meet the same specifications as compressed natural gas (CNG) and used as a transportation fuel. Here's a brief overview of the process for making RNG into CNG: RNG collection: The RNG is collected from its source, such as a landfill or dairy farm, and transported to a processing facility. RNG purification: The RNG is purified to remove impurities such as water, hydrogen sulfide, and other trace contaminants that could damage natural gas vehicle engines. RNG compression: The purified RNG is compressed to the desired pressure, typically between 3,000 and 3,600 psi, to create CNG. CNG storage: The CNG is stored in high-pressure storage tanks until it is ready to be used. Dispensing: The CNG is dispensed into natural gas vehicles or stored for later use. There are a few different methods for purifyi...

The U.S. Environmental Protection Agency (EPA) has established regulations and guidelines for the management and control of landfill gas (LFG) emissions, including requirements for LFG flaring. The specific requirements can vary depending on the size and type of the landfill, as well as the local regulatory framework. Under the EPA's regulations, all landfills that generate LFG are required to install a gas collection and control system (GCCS) to capture and control the gas emissions. The GCCS typically includes a network of pipes and wells to collect the gas, as well as a blower or vacuum system to transport the gas to a central point for treatment or flaring. For landfills that flare LFG, the EPA has established specific requirements to ensure that the flaring is done safely and effectively. These requirements include: Minimum Destruction Efficiency (MDE): The MDE is the percentage of methane in the LFG that must be destroyed by the flare. The EPA requires a minimum MDE of 98% fo...

Air cooled heat exchangers design good practices for temperature selection, Air re-circulation, Leaks, Approach temperature, Mean-temperature-difference (MTD) correction factor, Maintenance Cost, and Operating Costs. The dry-bulb temperature that is selected should be more than 2.5 percent of the warmest ambient temperatures with an addition of 5.4 ०F (3 ०C) as a contingency. Air recirculation: Prevailing winds and the locations and elevations of buildings, equipment, fired heaters, etc., require consideration. All air-cooled heat exchangers in a bank are of one type, i.e., all forced-draft or all induced-draft. Banks of air-cooled exchangers must be placed far enough apart to minimize air recirculation. During winter or extreme weather conditions, shelter needs to be considered for heavy rain, strong winds, freezing of moisture upon the fins, etc. More the number of fans, more the noise pollution. To reduce this noise pollution exchanger position, the reflective surfaces near the fan,...

Always follow the control valve manufacturer’s maintenance manuals. Typical maintenance topics are summarized here together with recommendation to extend the life of the control valves. Optimization of control valve assets depends on an effective maintenance philosophy and program. Three of the most basic approaches are: Reactive – Action is taken after an event has occurred. Wait for something to happen to a valve and then repair or replace it. Preventive – Action is taken on a timetable based on history; that is, try to prevent something bad from happening. Predictive – Action is taken based on field input using state-of-the-art, non-intrusive diagnostic test and evaluation devices or using smart instrumentation. Although both reactive and preventive programs work, they do not optimize valve potential. Following are some of the disadvantages of each approach. Reactive Maintenance Reactive maintenance allows subtle deficiencies to go unnoticed and untreated, simply because there is...

Acid gas treating, also known as gas sweetening and sour gas treating, refers to a group of processes that use various aqueous solvents such as Amines, Hot Potassium Carbonate, Sodium Hydroxide etc, to remove hydrogen sulfide (high toxicity) and carbon dioxide (lack of heating value) from gases. It is a very common unit process used in Gas Processing plant, Refineries, petrochemical plants, Coal Fired Power Plant and other industries. Principle Separation Technologies are listed below: Solvent Separation Adsorption Membrane Separation Cryogenic Distillation Solvent Separation: Figure below shows a general schematic of the CO2 removal using a sorbent.   Acid Gas Removal using amine treating Solvent separation process uses liquid absorbent or solid sorbent. It consists two steps - the absorption step and the regeneration step. In the contactor vessel, the CO2 - containing gas is brought into contact with regenerated solvent which captures the CO2. The rich solvent, loaded with C...