Coal Bed Methane Gas Recovery
This application is found in coal mines where two forms of gas may be produced. One gas is from microorganisms feeding off the coal, and the other gas is from gas deposits in the mines. By drilling into the coalmines, and locating sufficient gas deposits, the gas can be recovered through vacuum, depending on suction and discharge pressures at the well head. The gas, once recovered by the low-pressure vacuum, is then compressed by high-pressure compressors to a pipeline for processing or used for cogeneration, etc. Normally the methane gas recovered is very clean but significant quantities of liquids may be entrained in the gas. This gas is recovered for a number of uses, including cogeneration and gas plant processing for redistribution of sale.
Crude Oil Vacuum Distillation
Crude oil is processed to produce gasoline and other hydrocarbon fuels via atmospheric and/or vacuum distillation in refineries.
This application involves applying a vacuum to a crude oil distillation column. The combination of heat and vacuum separates the crude oil into different components based on their boiling temperature (distillation). Its purpose is to enhance the recovery of the lighter components, such as gasoline. Vacuum distillation is more energy efficient than atmospheric distillation.
Liquid ring vacuum pumps and steam ejectors offer reliable, low maintenance solutions for vacuum distillation of crude oil in refinery applications. Combining these technologies into an optimized, hybrid vacuum systems delivers an efficient solution that reduces greenhouse gas emissions.
Removal of oxygen from well injection water helps to prevent corrosion and sub-surface solids build-up. This also prevents the formation of aerobic bacterial colonies (sulfur reducing bacteria) in the water injection flow lines. Incoming water is filtered and then sent to Deoxygenation Towers for the removal of oxygen. This process is facilitated by NASH Hybrid Vacuum systems, which combines the reliability of liquid ring vacuum pumps with atmospheric air ejectors. These pumps and air ejectors are available in Stainless Steel, Aluminum Bronze and Hasteloy for the harsh conditions found offshore.
Delayed Coker Vapor Recovery
In delayed coker refinery and storage processes vacuum is used to recover petroleum vapors vented from coke. These gases are then condensed, collected, and repurposed as fuel gas.
NASH liquid ring vacuum pumps can withstand harsh wet gases, and deliver low maintenance reliable solutions for delayed coker vapor recovery applications.
Enhanced Oil Recovery
Enhanced oil recovery is an upstream process, which includes pulling a vacuum on an oil well to relieve pressure on the well. This allows the oil to flow more freely, increasing oil production. This application may also include associated gas, which is merely the inclusion or recovery of gas at the annulus of the well, with the oil being recovered and the separation of the oil/gas via a separator at the point of recovery, normally at the surface of the well.
Field Gas Boosting
Field gas boosting is the process of boosting low-pressure gas from the wellhead to a high-pressure pipeline. The wellhead gas pressure, below atmospheric pressure or at a relatively low positive pressure, will require a vacuum pump or a low-pressure compressor to extract the gas and to boost it to 15 to 30 PSI above atmospheric pressure. A liquid ring vacuum pump or compressor is used as the first stage, and then delivers the gas to the second stage high-pressure compressor. The high-pressure compressor, usually a rotary screw or reciprocating compressor, delivers the gas to a gas processing plant via a pipeline.
Flare Gas Recovery
Flare gas, vent gas, tail gas or off gas recovery is the capturing of waste gases during the refining process. No longer is it acceptable to simply dispose of these gases by flaring. To comply with Government and environmental regulations refineries turn to flare gas recovery system to condense, clean and repurpose hydrocarbons for other uses.
NASH & GARO liquid ring compressors and flare gas recovery systems provide safe and reliable compression of these potentially explosive and often times dirty gases. Liquid ring technology runs at cooler temperatures and can run with a variety of seal liquid allowing for flexibility in treating toxic or corrosive compounds in the process gas.
Fuel Gas Boosting
This application involves the utilization of a booster compressor to provide natural gas to a natural gas engine that may be utilized in the gas recovery or compression process.
Offshore Platforms - FPSO
Our liquid ring vacuum pumps, compressors and booster hybrid vacuum systems offer safe and sustainable solutions for offshore / FPSO applications including flare gas recovery and deaeration. We offer materials designed to handle the elements and harsh requirements of offshore platforms, while performing reliably and in compliance with environmental regulations.
Filtering or dewaxing is the process of recovering waxy compounds from production of hydrocarbon based oils. By removing waxy compounds from oils, it improves its quality and desirability.
Liquid ring vacuum pumps are pulling vacuum on continuously rotating disc or drum type filters that may contain inert nitrogen gas with chilled Methyl Iso-Butyl Ketone [MIBK] solvent. If higher vacuum levels are required, then a combination of a mechanical blower and liquid ring vacuum pumps is selected for this application.
NASH Liquid Ring Vacuum Pumps provide reliable, low maintenance operation for solvent dewaxing applications, and can utilize different seal liquids which handle carryover.
Vapor Recovery - Gas Boosting
This application differs from vent gas recovery in that the vapors recovered are of a relatively fixed composition rather than a variable mixture. A typical application is capturing gases vented from storage tanks. The vacuum level is closely controlled in order to protect the storage tanks. Usually the discharge pressure is relatively low. Often these gases are returned to the process or are liquified and returned to the storage tanks.