Coal dust treatment methods and compositions

a technology of coal dust and treatment methods, applied in the direction of solid fuels, petroleum industry, fuels, etc., can solve the problems of coal dust generation, black lung disease and other illnesses, slow oxidation to form, etc., and achieve the effect of enhancing foam stability and durability

Inactive Publication Date: 2018-12-06
BL TECH INC
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]In some cases it is desirable to provide foamed treatments to the coal and, in this regard, a foaming agent such as those selected from the group of amphoteric, nonionic and anionic surfactants can be used. In these cases the NRC can be conjointly used with the surfactant to enhance foam stability and durability. In one embodiment, the foaming agents include anionic surfactants and those comprising a long chain C11-C18 alkenyl sulfonate ...

Problems solved by technology

During transportation, handling and storage, mined coal can generate coal dust.
Coal dust dissemination poses safety, health and environmental concerns.
Airborne fugitive coal dust particulates can lead to black lung disease and other illnesses.
Additionally, when coal is exposed to air, it slowly oxidizes to form CO2 and heat.
Oxidation is a detrimental process since it reduces the caloric heating value of coal and can cause spontaneo...

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
  • Coal dust treatment methods and compositions
  • Coal dust treatment methods and compositions
  • Coal dust treatment methods and compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030]In order to assess the efficacy of the materials in inhibition of coal dust self-ignition, coal self-heating tests were performed. This is an accelerated test method wherein a coal sample is heated to a predetermined temperature with a known quantity and flow of air being supplied. This method accelerates natural coal oxidation and leads to the coal reaching a thermal runaway state.

Coal Sample:

[0031]Coal crushed to −250 microns

Solutions and Application:

[0032]Chemistries are prepared at two different concentrations in water, 0.5% and 2%. The chemistries are applied to the coal at a rate so that the same amount of moisture (4%) is added to all coal samples.

Measurements:

[0033]Temperature of the coal sample is measured and logged. Time for the coal sample to reach thermal runaway (typically at 200 F) is recorded. The delay in time to thermal runaway for a treated coal sample versus blank and moisture only samples are used to evaluate anti-oxidation efficacy.

Procedure:

[0034]A coal ...

example 2

rol Improvement

Apparatus:

[0036]Dust Monitor—Lab scale dust monitor uses white light to determine dust levels of materials dropped into the sampling chamber.

Substrate:

[0037]Coal samples, mixture of size fractions to generate sufficient dust to study.

Procedure:

[0038]Prepare solutions of various concentrations of each of the products. Prepare untreated coal substrate samples with spinning riffler to ensure uniform particle size distribution for each sample. Apply products to the coal. Dry the samples at 140 F for 30 minutes. Cool at room temperature for 30 minutes. Pass samples through the Dust Monitor and record dust values. The reported value is Dust Area+Max, which is the area integrated under the curve for the sample measured over 30 seconds added to the maximum dust level recorded for the sample. Lower Dust Area+Max values are indicative of superior dust control.

[0039]In these examples, EX-1, namely 4HT was added to coal without any dust control agent, and in addition to a known d...

example 3

ility

[0042]4HT was added to a known foaming agent, “C4”, an anionic surfactant, sodium olefin (C14-C16) sulfonate to determine its effect on foam stability.

Solutions:

[0043]200 mL solutions at ambient temperature (72° F.)

Apparatus:

[0044]Waring Commercial Blender (Model 7011G) marked with 50 mL graduations

Measurements:

[0045]Maximum foam height (to nearest 25 mL)[0046]½ life time (in sec)—time for 100 mL of solution to drain back into liquid phase

Procedure:

[0047]200 mL of solution was poured into the blender. The blender was turned on low speed for 30 seconds. The blender was then allowed to sit until half of the sample (100 mL) returned back to liquid state. The amount of time that passed until the liquid-foam interface hit the 100 mL mark was recorded as “foam ½ life time.”

Results are shown in Tables 3 and 4

TABLE 3Foam ½ life (min:sec)C4 + 4HT 0.75% +C4 + C2C4 %C4 onlyC4 + 4HT 1.5%C2 0.75%0.75%0.11:513:573:492:380.33:415:575:393:220.54:316:106:294:100.75:016:526:474:370.95:087:107:07...

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

No PUM Login to view more

Abstract

Methods and compositions for treating coal are provided. A nitroxyl radical compound is added to the coal in order to inhibit coal autooxidation. Additionally, the nitroxyl radical compound can be conjointly used with conventional dust control agents, in order to suppress fugitive coal dust dissemination. In those cases in which foamed treatment is desired to treat coal dust, the nitroxyl radical compound can be conjointly used in the foamable compositions, along with a variety of foam building surfactants such as the amphoteric, nonionic and anionic surfactants.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Indian Provisional Patent Application No. 2615 / CHE / 2015 filed May 25, 2015.FIELD OF THE INVENTION[0002]The present invention pertains to methods for treating coal and coal piles to inhibit fugitive coal dust dissemination, and coal auto-oxidation. Additionally, stability of foam used to apply dust control and auto-oxidation treatments is also improved.BACKGROUND[0003]Coal is a carbonaceous solid fossil fuel. It is extracted (mined) by surface or underground methods. Coal that is not yet mined, but is in the ground, that may or may not be exposed to the outside conditions is referred to as in-situ coal. Mined coal is usually crushed to a smaller size for transportation, handling and storage. The usual size for this crushed coal is less than eight inches (less than 200 mm). This invention treats both in-situ coal and extracted (mined) coal during transportation, handling and storage. During tra...

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): C10L5/24C10L5/04C10L5/32
CPCC10L5/24C10L5/04C10L5/32C10L2230/081C10L2230/14C10L2250/04C10L2200/04
Inventor RAAB, MICHAEL T.SURESH, SEETHALAKSHMILOKARE, ANILKUMARM.N., CHAITRA
Owner BL 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