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Chemical Processing 分析气体集中供气系统


Chemical Processing is an industry in which the raw materials undergo chemical conversion during their processing into finished products, as well as (or instead of) the physical conversions common to industry in general. In the chemical process industry, the products differ chemically from the raw materials as a result of undergoing one or more chemical reactions during the manufacturing process. The chemical process industries broadly include the traditional chemical industries, both organic and inorganic; the petroleum industry; the petrochemical industry, which produces the majority of plastics, synthetic fibers, and synthetic rubber from petroleum and natural-gas raw materials; and a series of allied industries in which chemical processing plays a substantial part.

Chemical Tank Blanketing

Blanketing with an inert gas, such as nitrogen, is often used to ensure the chemical integrity and maximize safety. Nitrogen tank blanketing controls the oxygen concentration and humidity within the vessel, protecting the product from contamination, degradation, and chemical change which minimizes the chance of explosion. A nitrogen blanket can also be used to balance tank volumes and prevent collapse during unloading. 

A Parker Balston or domnick hunter Nitrogen Generator supplies a continuous stream of dry (-58°F/-50°C dewpoint) nitrogen creating an inert headspace that ensures chemical integrity and decreases fire hazard.

Dry Air for Process Instrumentation

Commonly found in the petrochemical industry, analyzer buildings are the control center of modern refineries and chemical plants. Process instruments utilize sensitive, air-operated stream control valves to take samples of process streams. The analyzers assure product quality by sending feedback to process control valves that fine tune process parameters.

Instrument grade air is needed for the control systems and must be of the highest quality to assure maximum up-time. Downtime of any instrumentation can cost thousands of dollars per hour.

Most analyzer buildings utilize plant instrument air. In many plants this air is of unreliable quality. Often, due to system upsets, the compressed air can become contaminated with oil and water. In addition, warm plant air entering the air conditioned building can cause condensation. This contamination can ruin the performance of sensitive process analyzers and control valves and cause production setbacks.

To ensure that the analyzer building has zero downtime, a final point-of-use air dryer is required. The air dryer acts as a final line of defense to prevent condensation in the air lines.

Membrane air dryers are ideal for this application as they do not require electricity and are safe to use in all Class 1 Div 2 installations. The Parker Balston 76 Series Air Dryer assures a continuous supply of instrument grade air.

Sample Conditioning

There are many requirements throughout refineries, petroleum and chemical facilities where sample analysis is critical to the operation and production output. Sample analysis instrumentation are adversely effected by condensed contaminants, gas bubbles and solid contaminants both of which can also skew the analysis output. Efficient removal of undesirable contaminants from a sample stream will ensure accurate analysis and trouble-free operation of the instrumentation.

Typical applications for sample filtration include stack gas or emissions sampling, on-line process analyzers effluent stream sampling, natural gas analysis and ambient air analysis. These sampling applications all have specific and unique filtration requirements depending on the analysis to be performed. Quantitative measurement of solids (capture and retention of solids) is unique to stack and exhaust gas sampling. Slipstream or bypass sampling (high flow, short lag time) is used extensively for product quality analysis. Coalescing filtration is used widely in most sampling applications to protect analyzers from condensables.

Requirements for sample filters range so widely that specifying a filter is best done on a case by case basis. There is one generalization that applies to all sample filter requirements: the filter must be able to efficiently separate a non-continuous phase contaminant from the continuous sample stream phase. In addition to removing solid particles the filter specifically must be able to remove liquid droplets in gas samples and to remove immiscible liquid droplets and gas bubbles in liquid samples. Most filter media that provide an adequate job of removing particles from liquids or gasses, gas bubbles from liquids and two immiscible liquids consists of glass microfiber media with a coalescing matrix design.

Parker Balston Sample Analyzer Filters protect analyzers from sample impurities by removing solids and liquids from gases with 99.999% efficiency at 0.01 micron and liquid filtration to 1 micron and lower.