Production of activated char using hot gas

a technology of activated char and hot gas, which is applied in the direction of combustible gas production, alkali metal compounds, chemistry apparatus and processes, etc., can solve the problems of harmful levels entering human food supplies, large spread of neurological damage and birth defects to the local population, and use of adsorbents, etc., to improve production efficiency and versatility, reduce the cost of activated char, and process small

Inactive Publication Date: 2006-09-14
PRAXAIR TECH INC
View PDF11 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021] As discussed above, the hot oxygen or hot gas burner as used in accordance with the present invention allows for on-site activated char production. The combination of high temperatures and good mixing achieved with this burner allows activated char production with relatively small, simple process equipment (especially as compared to the rotary kilns currently used to produce PAC). Moreo

Problems solved by technology

By consuming fish in the bay, wide spread neurological damage and birth defects to the local population were reported.
Through chemical and biological processes, such mercury can become concentrated by man

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production of activated char using hot gas
  • Production of activated char using hot gas
  • Production of activated char using hot gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068] Several samples of activated char were produced using the experimental set-up illustrated in FIG. 2. Referring to FIG. 2, natural gas was used for stream 10, oxygen was used for stream 11 and Powder River Basin (PRB) coal was used for stream 13.

[0069] Listed in Table 1 are the stochiometric ratios (SR) used to make the activated chars and the resulting properties of the chars. For comparison purposes, the properties of Darco® FGD, a powder activated carbon commercially available from Norit America, Inc., is also listed in Table 1.

[0070] SRHOB was calculated by dividing the amount of oxygen required to completely combust the natural gas fed in stream 10 by the amount of oxygen fed in stream 11. SRReaction Vessel was calculated by dividing the amount of oxygen to completely combust the PRB coal fed in stream 13 by the amount of oxygen entering reaction vessel 3.

[0071] The carbon content of the activated char was determined by using a muffle furnace to dry a sample of activat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Temperatureaaaaaaaaaa
Temperatureaaaaaaaaaa
Ratioaaaaaaaaaa
Login to view more

Abstract

A gas mixture preheated to high temperatures using an oxy-fuel, an oxygen-enriched air-fuel or an air-fuel burner is used to devolatilize and partially oxidize carbonaceous feedstock, thereby producing an active residual char that can be used in applications utilizing activated carbon. Use of hot gas and ground carbonaceous feedstock allows the equipment to be minimized, thereby allowing the activated carbon to be produced at or near points of use, for example the production of activated char at or near utility boilers for use in the reduction of mercury emissions from flue gas streams.

Description

TECHNICAL FIELD [0001] The present invention relates generally to methods and systems to produce activated char such that production can occur at or near the end use point. BACKGROUND OF THE INVENTION [0002] Activated carbon is a widely used adsorbent in industrial processes to remove contaminants from gas or liquid streams. For example, attempts to meet currently pending mercury emissions limits for fossil fuel fired power plants by injecting powdered activated carbon (PAC) into the flue gas upstream of a particulate control device in order to remove contaminants from the flue gas are being investigated. [0003] The removal of mercury from flue gas streams from combustion processes is of significant interest. The toxicity of mercury to humans has long been known. An example of the devastating effects of mercury exposure occurred in Minamata, Japan in the 1950's where organic mercury byproducts of acetaldehyde production were discharged into the local bay, and were ingested and metab...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01D3/00C01B32/336
CPCB01J20/20C01B31/10C10J3/485C10J2300/093C10J2300/0959C10J2300/0973C10J2300/1846C01B32/336
Inventor BOOL, LAWRENCE E. IIICHAO, CHIEN-CHUNGWEISE, MARK K.BRADLEY, JURRON L.D.
Owner PRAXAIR TECH INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap