Coal refinement with remote-head metering pumps in condensing systems

In process engineering, various tasks include the metering and circulation of media with critical properties such as high temperature or high abrasiveness. For the injection of coal slurry in coal conversion plants, coal is ground to dust and mixed with oil or solvent to produce a suspension which is usually abrasive and very hot. Regular metering pumps, due to their compact design, are not suitable for such tasks because they can’t keep away the critical conditions from the metering pumps’ displacer system.

However, exactly this is necessary in order to meter the fluid safely as well as protect operating personnel and the system. LEWA metering pumps with remote head are used in these applications because their design separates valve head from pump drive.

Solution

Remote-head metering pumps are used for coal injection because they offer the following benefits:

  • Reliable operation thanks to spatial separation of the valve head and displacement system
  • A falling hydraulic connecting line (if necessary, with cooling jacket) prevents sedimentation in the fluid chamber.
  • A flushing pump keeps slurry particles away from the plunger seal.
  • The hermetic seal of our pump technology ensures reliable conveyance of potentially hazardous substances, which are required for the chemical reaction (e.g. hydrocyanic acid or hydrogen sulfide).
  • Any gas bubbles that have accumulated are carried away through the gas removal valve and into the main line by a small discharge flow.
Coal production

Background

How and why is coal refined?

Coal refinement enables the production of various successor products from coal. Raw lignite cannot be used until it has been processed in a coal refinery, for example, by being made into briquettes, pulverized lignite or fluidized-bed lignite.

One kind of coal refinement is coal liquefaction, which uses the Fischer-Tropsch method, among others. For this, the coal must first be gasified at temperatures over 1000 °C while steam and air or oxygen are fed. The resulting synthetic gas is then cooled. During this process, phenol, liquid ammonia, carbon dioxide, hydrogen sulfide, hydrocyanic acid and organic components are removed from the gas. Then the synthetic gas is converted into hydrocarbons (such as paraffins and alcohols) in a heterogeneous catalytic reaction.

A Fischer-Tropsch synthesis results in various end products such as synthetic gasoline, diesel, heating oil and diverse raw materials for the chemical industry.

Industries

Pumps and Metering Systems for Distillation Plants and Applications in Refineries

Crude oil must be cleaned, separated, and converted (refined) until the final products suitable for sale are made (e.g., gas, diesel, heating oil, lubricants, propane, butane). LEWA supports you with pumps and metering systems, which are used in the refining process during chemical metering. Application with our products are distillation plants, coker, cracker, or visbreaker, for example. Ask our experts for more information!

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Chemical Pumps and Metering Packages for the Chemical Industry

When critical, environmentally hazardous, toxic, or flammable fluids and suspensions need to be reliably conveyed or metered in high-pressure processes, there is no alternative to hermetically sealed metering pumps, process diaphragm pumps, and metering systems from LEWA. Hermetically sealed LEWA pumps with pressures up to 1200 bar are the first choice for the production of chemical intermediate and end products. Contact our experts and let us advise you about your individual chemical pump or system solution!

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Pumping solutions for mining and metal and mineral processing

From the explosives manufacturing, ore extraction and metal and mineral recovery to effluents treatment and final product finishing, our solutions have helped our clients to save energy and consumables while keeping high operational safety and low cost of ownership.

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Products

LEWA ecoflow® diaphragm metering pump

LEWA ecoflow is the innovative and universal metering pump with DPS diaphragm protection system in a tried-and-tested modular system. Suitable for numerous applications, the ecoflow is our real all-around talent, relied on by customers from all industries.

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LEWA ecoflow® process pumps for high-pressure applications

The innovative ecoflow diaphragm process pump shows its strengths in high-pressure applications in the oil and gas, refinery and petrochemical industries as well as in the sensitive areas of pharmaceuticals, biotechnology, food and beverage production.

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LEWA triplex® process pumps for high-pressure processes

The LEWA triplex process diaphragm pump is among the world's most compact high-pressure pumps and can even be set up in the tightest spaces when space is at a premium. The power package has proven its strength in numerous high-pressure processes in a variety of industries. Oil and Gas icon Gas odor icon gray Refinery icon Petrochemicals icon Chemicals icon Plastics icon gray Cleaning icon Cosmetics icon Pharma icon Food icon Energy icon Other icon

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