CA1122010A - Method of controlling coal dust with oil - Google Patents
Method of controlling coal dust with oilInfo
- Publication number
- CA1122010A CA1122010A CA000317032A CA317032A CA1122010A CA 1122010 A CA1122010 A CA 1122010A CA 000317032 A CA000317032 A CA 000317032A CA 317032 A CA317032 A CA 317032A CA 1122010 A CA1122010 A CA 1122010A
- Authority
- CA
- Canada
- Prior art keywords
- coal
- dust
- oil
- supply
- coal dust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
- C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
- C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
- C10L5/16—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders with bituminous binders, e.g. tar, pitch
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Liquid Carbonaceous Fuels (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Coal dust is collected at transfer points and deposited in a hopper. The coal dust is fed to a pug mill where it is mixed thoroughly with oil until soft pellets are formed. The pellets are stored with coal as addi-tional fuel for a furnace.
-1a-
Coal dust is collected at transfer points and deposited in a hopper. The coal dust is fed to a pug mill where it is mixed thoroughly with oil until soft pellets are formed. The pellets are stored with coal as addi-tional fuel for a furnace.
-1a-
Description
z~
BACKGROUND OF THE INVENTION
Field of the Invention This application relates to a method of con-trolling coal dust.
Large consumers of coal have a constant problem with coal dust. Al-though the coal dust is combustible, it is difficult to handle, and a large percentage is blown away or otherwise scattered. Thus, the coal dust not only presents a difficult material handling problem, but it also causes a pollution problem since the dust which escapes from control can damage equipment and harm the general environment.
Description of the Prior Art Many efforts have been made heretofore to con-trol coal dust. For example, United States Patents
BACKGROUND OF THE INVENTION
Field of the Invention This application relates to a method of con-trolling coal dust.
Large consumers of coal have a constant problem with coal dust. Al-though the coal dust is combustible, it is difficult to handle, and a large percentage is blown away or otherwise scattered. Thus, the coal dust not only presents a difficult material handling problem, but it also causes a pollution problem since the dust which escapes from control can damage equipment and harm the general environment.
Description of the Prior Art Many efforts have been made heretofore to con-trol coal dust. For example, United States Patents
2,175,259; 2,197,792; and 2,234,555 show the spraying of coal dust with oil or wax for better control of the dust.
While this method produces a coating over the top of a layer of coal dust, it leaves a large quantity of dry dust beneath the coating which can, under certain circumstances, escape to foul the air and the surrounding terrain.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a method of controlling coal dust at a coal transfer point and also for supplementing a coal fuel supply comprising the steps of collecting dust from a coal supply during transfer of coal to clèan the transferred coal, add-ing used transformer oil that is combustible to the collected coal dust, said oil be~ng free flowing at low
While this method produces a coating over the top of a layer of coal dust, it leaves a large quantity of dry dust beneath the coating which can, under certain circumstances, escape to foul the air and the surrounding terrain.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a method of controlling coal dust at a coal transfer point and also for supplementing a coal fuel supply comprising the steps of collecting dust from a coal supply during transfer of coal to clèan the transferred coal, add-ing used transformer oil that is combustible to the collected coal dust, said oil be~ng free flowing at low
3~ temperatures, mixing the collected dust and oil at a ratio ~;
within a range of 15-50 gallons of oil to each ton of collected dust to form soft pellets, and returning the collected dust in the form of said pellets back to the cleaned coal supply, thereby enhancing the available supply of combustible coal traveling from the coal transfer point.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a view in plan of the apparatus for practicing the present invention.
Figure 2 is a side elevation view of the apparatus of Figure 1.
Figure 3 is a view taken on the line 3-3 of Figure 2.
DESCRIPTION OF THE P~EFERRED EM~ODIMENT
When coal is delivered to a coal consuming facili-ty, such as a power plant, the coal must pass through seve-ral transfer points, where it is transferred from one means of transport to another, before it reaches the furnace where it is burned to drive the turbines. At each trans-fer point, the handling of the coal produces coal dust which could pollute the air and be harmful to adjacent machinery. Consequently, dust collectors are generally loeated adjacent some or all of the transfer points to capture the coal dust for deposit in collecting hoppers.
There is shown in Figures 1 and 2, a coal dust treating apparatus 10 which is located adjacent a dust collector. A treating unit may be located, for example, adjaeent a eo:Lleetor at a ear dumper, where the coal is dumped from a railroad ear to a conveyor, and units may also be located at some or all of the other dust collectors in the system.
~ 2 ~ 1~
The coal dust treating apparatus 10 includes a hopper 12 (Figure 2), supported ~y legs 13, into which dust from the collector bag is dumped. The coal dust flows from the hopper through a rotary cutoff valve 14 and S through duct 15 into a pug mill 16.
Oil is stored in a storage tank 18 which is connected to the inlet of pump 20 by line 22 The outlet of pump 20 is connected to line 24 which extends over the pug mill 16. Two discharge nozzles 26 ~re connected to the line 24 to spray oil into the pug mill when a motor 28, which is connected to d.rive the pump, is energized.
The pug mill 16 has an elongated trough 30, with two parallel longitudinally extending shafts 32a, 32b journalled in the ends of the trough. The shafts extend through the inlet end 30a of the trough and are connected . by gears 34a, 34bo One of the shafts 32a, has a sprocket 36 connected by chain 38 to ~he sprocket 40 on the output shaft of a speed reducer 42. The input shaft of tha speed reducer is driven by motor 44 to drive:the shafts 32a, 32b, through the speed. reducer 42, in opposita directions~
Each of the shafts 32a, 32b has spaced pairs o diametrically opposed paddles 46, as shown in Figure 3, each of the pad*les inclined relative to a plane perpendi-cular to the axes of the shafts. Thus~ the paddles, when rotated, serve to mix any substance introduced into the .
. . trough and, at the same time, advance the substance to the discharge.~end 30b of the trough 30~ -An openins 50 at that.end of the trough is directly over a conveyor 52. The conveyor 52 may be a conveyor which carries coal from the 13L;~2~1~
car dumper (not sho~n) to a storagc area, or, instead, may be a conveyor which takes the substance from pug mill 16 to a conveyor carrying coal to a storage area. In any event, the substance is eventually burned with the coal in the furnace.
The duct 15 leading from rotary valve 14 dis-charges the coal dust into the inlet end 30a of the pug mill 16 as indicated in Figure 1. The oil is discharged through the two nozzles 26 onto the coal dust Lmmediately downstream of duct 15. The oil and dust are discharged into the pug mill in a ratio of at least 15 gallons of - oil per ton of coal dùst, although preferably a larger amount of oil (say, up to 50 gallons) is used for each ton of coal dust. Under 15 gallons of oil per ton of coal dust will leave a significant amount of free dust in the mixture, while any oil in excess of 50 gallons per ton will generally be superfluousO
The rate of rotation of shafts 32aO 32b moves the mixture of oil and coal dustt from the point where the coal aust is sprayed with the oil to the discharge opening 50 in an elapsed tIme of about five minutes. During this time the paddles 46 thoroughly mix the oil and coal dust to form soft pellets of from approximately 1/16 inch diameter to 1 inch diameter. These pellets are relatively free flowing and virtually dust free. Preferably, the pellets are dumped back into the coal, which travels by conveyor to a storage area, for eventual transfer with - the coal to t~e! furnace.
The oil used is combustible, and the oil and coal dust pel~ets serve as fuel for the boilerO Although any combustible oil can be used, I pre~er to employ a mineral based transformer oi.l, and, in the interest of economy, pre~er a used transformer oil. The transformer oil is pre~erred because it is ~ree flowing at very low temperatures without heating.
Although the best mode contemplated for carrying out the presen-t invention has been herein shown and described, i~ will be apparent that modification and varia-tion may be made without departing from what is regarded to be the subject matter of the invention.
JFV:cds ~-- .
~ .
.
within a range of 15-50 gallons of oil to each ton of collected dust to form soft pellets, and returning the collected dust in the form of said pellets back to the cleaned coal supply, thereby enhancing the available supply of combustible coal traveling from the coal transfer point.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a view in plan of the apparatus for practicing the present invention.
Figure 2 is a side elevation view of the apparatus of Figure 1.
Figure 3 is a view taken on the line 3-3 of Figure 2.
DESCRIPTION OF THE P~EFERRED EM~ODIMENT
When coal is delivered to a coal consuming facili-ty, such as a power plant, the coal must pass through seve-ral transfer points, where it is transferred from one means of transport to another, before it reaches the furnace where it is burned to drive the turbines. At each trans-fer point, the handling of the coal produces coal dust which could pollute the air and be harmful to adjacent machinery. Consequently, dust collectors are generally loeated adjacent some or all of the transfer points to capture the coal dust for deposit in collecting hoppers.
There is shown in Figures 1 and 2, a coal dust treating apparatus 10 which is located adjacent a dust collector. A treating unit may be located, for example, adjaeent a eo:Lleetor at a ear dumper, where the coal is dumped from a railroad ear to a conveyor, and units may also be located at some or all of the other dust collectors in the system.
~ 2 ~ 1~
The coal dust treating apparatus 10 includes a hopper 12 (Figure 2), supported ~y legs 13, into which dust from the collector bag is dumped. The coal dust flows from the hopper through a rotary cutoff valve 14 and S through duct 15 into a pug mill 16.
Oil is stored in a storage tank 18 which is connected to the inlet of pump 20 by line 22 The outlet of pump 20 is connected to line 24 which extends over the pug mill 16. Two discharge nozzles 26 ~re connected to the line 24 to spray oil into the pug mill when a motor 28, which is connected to d.rive the pump, is energized.
The pug mill 16 has an elongated trough 30, with two parallel longitudinally extending shafts 32a, 32b journalled in the ends of the trough. The shafts extend through the inlet end 30a of the trough and are connected . by gears 34a, 34bo One of the shafts 32a, has a sprocket 36 connected by chain 38 to ~he sprocket 40 on the output shaft of a speed reducer 42. The input shaft of tha speed reducer is driven by motor 44 to drive:the shafts 32a, 32b, through the speed. reducer 42, in opposita directions~
Each of the shafts 32a, 32b has spaced pairs o diametrically opposed paddles 46, as shown in Figure 3, each of the pad*les inclined relative to a plane perpendi-cular to the axes of the shafts. Thus~ the paddles, when rotated, serve to mix any substance introduced into the .
. . trough and, at the same time, advance the substance to the discharge.~end 30b of the trough 30~ -An openins 50 at that.end of the trough is directly over a conveyor 52. The conveyor 52 may be a conveyor which carries coal from the 13L;~2~1~
car dumper (not sho~n) to a storagc area, or, instead, may be a conveyor which takes the substance from pug mill 16 to a conveyor carrying coal to a storage area. In any event, the substance is eventually burned with the coal in the furnace.
The duct 15 leading from rotary valve 14 dis-charges the coal dust into the inlet end 30a of the pug mill 16 as indicated in Figure 1. The oil is discharged through the two nozzles 26 onto the coal dust Lmmediately downstream of duct 15. The oil and dust are discharged into the pug mill in a ratio of at least 15 gallons of - oil per ton of coal dùst, although preferably a larger amount of oil (say, up to 50 gallons) is used for each ton of coal dust. Under 15 gallons of oil per ton of coal dust will leave a significant amount of free dust in the mixture, while any oil in excess of 50 gallons per ton will generally be superfluousO
The rate of rotation of shafts 32aO 32b moves the mixture of oil and coal dustt from the point where the coal aust is sprayed with the oil to the discharge opening 50 in an elapsed tIme of about five minutes. During this time the paddles 46 thoroughly mix the oil and coal dust to form soft pellets of from approximately 1/16 inch diameter to 1 inch diameter. These pellets are relatively free flowing and virtually dust free. Preferably, the pellets are dumped back into the coal, which travels by conveyor to a storage area, for eventual transfer with - the coal to t~e! furnace.
The oil used is combustible, and the oil and coal dust pel~ets serve as fuel for the boilerO Although any combustible oil can be used, I pre~er to employ a mineral based transformer oi.l, and, in the interest of economy, pre~er a used transformer oil. The transformer oil is pre~erred because it is ~ree flowing at very low temperatures without heating.
Although the best mode contemplated for carrying out the presen-t invention has been herein shown and described, i~ will be apparent that modification and varia-tion may be made without departing from what is regarded to be the subject matter of the invention.
JFV:cds ~-- .
~ .
.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of controlling coal dust at a coal transfer point and also for supplementing a coal fuel supply comprising the steps of collecting dust from a coal supply during transfer of coal to clean the trans-ferred coal, adding used transformer oil that is com-bustible to the collected coal dust, said oil being free flowing at low temperatures, mixing the collected dust and oil at a ratio within a range of 15-50 gallons of oil to each ton of collected dust to form soft pellets, and returning the collected dust in the form of said pellets back to the cleaned coal supply thereby enhancing the supply of combustible fuel traveling from the coal trans-fer point.
2. The method of claim 1 wherein said coal transfer point is located at a coal-consuming facility, and including the further step of consuming the pellet-enhanced coal supply at the facility.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US85605377A | 1977-11-30 | 1977-11-30 | |
| US856,053 | 1977-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122010A true CA1122010A (en) | 1982-04-20 |
Family
ID=25322758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000317032A Expired CA1122010A (en) | 1977-11-30 | 1978-11-28 | Method of controlling coal dust with oil |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5480301A (en) |
| AU (1) | AU517950B2 (en) |
| BR (1) | BR7807540A (en) |
| CA (1) | CA1122010A (en) |
| DE (1) | DE2851856C3 (en) |
| FR (1) | FR2410500A1 (en) |
| GB (1) | GB2009230B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725392A (en) * | 1980-07-23 | 1982-02-10 | Hitachi Ltd | Storage of coal |
| DE102009014717B4 (en) * | 2009-03-27 | 2019-02-28 | Mueg Mitteldeutsche Umwelt- Und Entsorgung Gmbh | Method and device for processing dusty and liquid / pasty waste materials and for producing a mixed fuel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT8423B (en) * | 1901-12-12 | 1902-07-25 | Heinrich Loewidt | Process for the production of an artificial fuel. |
| FR493622A (en) * | 1918-01-12 | 1919-08-14 | Method of manufacturing a fuel from coal dust | |
| GB136790A (en) * | 1919-09-12 | 1919-12-24 | John Villiers Eyre | Improvements in or relating to Fuel. |
| GB842711A (en) * | 1956-08-16 | 1960-07-27 | Carves Simon Ltd | Improvements relating to the removal of coal dust from air and gases |
| FR1273167A (en) * | 1960-11-08 | 1961-10-06 | Mannesmann Ag | Process for preparing fine coal dust for briquetting |
| DE2540165B2 (en) * | 1975-09-09 | 1979-01-11 | Steag Ag, 4300 Essen | Processing process for obtaining a fuel from coal that is used to operate a pressurized gasifier |
-
1978
- 1978-11-10 AU AU41499/78A patent/AU517950B2/en not_active Expired
- 1978-11-17 GB GB7844930A patent/GB2009230B/en not_active Expired
- 1978-11-17 BR BR7807540A patent/BR7807540A/en unknown
- 1978-11-20 JP JP14244278A patent/JPS5480301A/en active Granted
- 1978-11-28 CA CA000317032A patent/CA1122010A/en not_active Expired
- 1978-11-29 FR FR7833685A patent/FR2410500A1/en active Pending
- 1978-11-30 DE DE19782851856 patent/DE2851856C3/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2851856C3 (en) | 1981-10-29 |
| JPS5654356B2 (en) | 1981-12-24 |
| DE2851856A1 (en) | 1979-05-31 |
| GB2009230B (en) | 1982-09-08 |
| AU517950B2 (en) | 1981-09-03 |
| JPS5480301A (en) | 1979-06-27 |
| GB2009230A (en) | 1979-06-13 |
| AU4149978A (en) | 1979-06-07 |
| FR2410500A1 (en) | 1979-06-29 |
| BR7807540A (en) | 1979-07-24 |
| DE2851856B2 (en) | 1981-02-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |