US3604824A - Thermal incineration unit - Google Patents

Thermal incineration unit Download PDF

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Publication number
US3604824A
US3604824A US31961A US3604824DA US3604824A US 3604824 A US3604824 A US 3604824A US 31961 A US31961 A US 31961A US 3604824D A US3604824D A US 3604824DA US 3604824 A US3604824 A US 3604824A
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United States
Prior art keywords
gas
passageway
section
fume
recycle
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Expired - Lifetime
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US31961A
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English (en)
Inventor
Leslie C Hardison
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Honeywell UOP LLC
Universal Oil Products Co
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Universal Oil Products Co
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Assigned to UOP, DES PLAINES, IL, A NY GENERAL PARTNERSHIP reassignment UOP, DES PLAINES, IL, A NY GENERAL PARTNERSHIP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KATALISTIKS INTERNATIONAL, INC., A CORP. OF MD
Assigned to UOP, A GENERAL PARTNERSHIP OF NY reassignment UOP, A GENERAL PARTNERSHIP OF NY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UOP INC.
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
    • F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
    • F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure

Definitions

  • the present invention relates to an improved form of thermal incinerator unit and in particular to a type adapted for use with a drying oven or a curing zone discharging an air-polluting gas stream containing combustible components of high B.t.u. content.
  • a still further object of the present invention is to provide an overall unitary oven-incinerator design which will provide a gas recirculation flow from and back to the oven as well as gas flows through the incinerator section and to gas bypass sections.
  • the present invention provides a thermal incinerator unit for use in combination with a curing zone discharging combustible fumes, which comprises in combination, an elongated combustion section with a fume inlet opening at one end and a hot gas outlet from the opposite end thereof, an axial-positioned burner means directed into said inlet opening and adjustable fuel supply means to said burner means, gas passageway means from said hot gas outlet to said fume inlet opening to effect a hot gas recycle to the latter at said burner means, additional gas passageway means from said hot gas outlet to the curing zone, and a gas outlet conduit from said hot gas outlet to effect a cleaned gas discharge to the atmosphere, at least one adjustable fresh air inlet means to said unit, and fan means connective with said unit providing flow of fumes into said combustion section and through said passageway and conduit means to maintain gas and fume flows therethrough.
  • the present improved design is particularly adapted to accommodate high B.t.u. content fumes so as to effect an efficient incineration of the fumes while precluding an excessive temperature rise through the cornbustion zone.
  • a temperature which is greater than about l,350 to [400 F.
  • the present design and arrangement provides for a recycle of hot combustion gases from the outlet zone of the combustor section back along the latter and into its inlet end in admixture with the fume stream being introduced thereto.
  • the hot recycle gases which are to be brought into admixture with the fume stream will be returned through an annular-form passageway which is in an indirect heat exchange relationship with the outer wall of the combustion section so that there is a maximum retention of heat in the system.
  • a heat exchange zone at the downstream end of the combustion section so that fresh air may be heated by indirect heat exchange means from the incinerated fumes leaving the combustion section.
  • the heated fresh air together with a portion of the incinerated gas stream and, where desired, a portion bypassed fume stream may be passed through suitable conduit means to the curing zone or drying oven from which the fume stream is withdrawn.
  • a single fan to effect the withdrawal of fumes from a curing zone and the introduction of the fumes into the combustor zone, as well as induce hot gas flow trough the recycle passageway and combined heated gas flow back into the curing zone or oven.
  • additional fan means may be brought into use in connection with the introduction of fresh air or to effect increase flow rates with respect to recycle and gas bypass passageway means.
  • a fume bypass passageway around or in a heat exchange relationship with the hot recycle stream passing back around the combustor zone such that recirculated gas may be carried back to the oven or curing zone in admixture with a portion of the oxidized gas stream.
  • the bypass arrangement permits a controlled portion of the fume-laden gas stream to be introduced into the combustor zone such that there may be a short residence period in such zone, say of the order of 0.1 to 0.2 seconds to produce of the order of per-' cent conversion.
  • an extended passageway from the combustor zone can permit a greater residence time for the net oxidized gas stream carrying to the discharge stack such that there is atleast about 0.5 to 0.6 seconds of residence time to produce a greater than percent conversion and an efficient air-pollution control arrangement.
  • the recycle of a portion of the hot combustion gases from the end of the combustor zone has the effect of increasing the effective inlet temperature at a substantially constant outlet temperature operation and, of course, this reduces the fuel requirements for the burner means at the inlet means of combustor zone.
  • the recycle arrangement provides for the admixture with the combustible fume stream being introduced to the incineration zone to effect an increased temperature for such stream and a reduction in the temperature rise of the gas stream carrying through the length of the combustion zone.
  • the practical result of the incinerator design is to provide a unit that can provide high efficiency and a controlled maximum outlet temperature which is particularly adapted for use in combination with a drying oven or other type curing zone which discharges a fume stream with a high B.t.u. content.
  • FIG. 1 of the drawing is a schematic elevational view indicating a thermal incinerator system providing for hot gas recycle in combination with a curing zone.
  • FIG. 2 of the drawing is a diagrammatic side elevational view of an alternate form of a thermal inciner-ator unit providing for both recycle gas passageway and fume bypass passageway means which encompass the combustor section of the unit in a heat exchange manner.
  • FIG. 3 of the drawing is a partial elevational view indicating a modified system for effecting the stagewise introduction of the hot recycle gases into the combustor section of the unit.
  • a thermal incinerator unit having a combustor zone which is encompasses by shell means 2 with an inlet opening 3, formed from baffle plate means 4, and an outlet section 5 connecting with a stack means 6.
  • a gas passageway tubes 7 providing a heat exchange zone 8 therearound to accommodate the heating of a fresh airstream that is introduced by way of inlet means 9.
  • the latter has a damper means 10 therein to control fresh airflow into the system.
  • Upstream of the inlet portion of the combustor section there is also provided a mixing section 11 which is in communication with fan means 12 that, in turn, receive a fume-laden stream from duct means 13 and fresh air from duct means [4.
  • the latter is provided with a damper or valving means 15 to effect the control of the quantity of fresh air being introduced into the system at this zone.
  • FIG 1 of the drawing There is also indicated diagrammatically in FIG 1 of the drawing a small drying oven or curing zone 16 encompassed by housing means 17 adapted to accommodate the movement of wires or other coated items that are passed through such curing zone.
  • a fume-laden gas outlet passageway from the curing zone is provided at outlet means 18 to connect to duct means 13 and thence pass by way of fan 12 around the burner means 19 and into the thermal incinerator section of the unit.
  • the burner 19 is indicated as being supplied with fuel by way of line 20 and control valve means 21.
  • the downstream end of the combustor section 1 is provided with a sidewall hot gas opening 22 which is connective with a recycle passageway 23 as well as with a recirculation passageway 24 which connects with and discharges into curing zone 16.
  • the recirculation passageway 24 also is in open communication with the heat exchange zone 8 for the fresh air being introduced by way of inlet means 9, whereby a resulting mixed gas stream of combustion products are preheated air will be introduced back into the curing zone.
  • bypass passageway 25 connective with the fume or combustor inlet zone 11 whereby a portion of the fume-laden gas stream from fan means 12 can carry around combustor I and directly back to the curing zone in admixture with preheated fresh air and hot combustion gases from outlet means 22.
  • the bypass arrangement precludes having to pass all of the fume stream through the combustor zone 1 and permits a controlled incineration operation with only a desired portion of the total gas stream having to be discharged as net gas through the stack means 6.
  • bypass arrangement provides for the present improved system of having a controlled temperature rise in the incinerator section, while also providing for the blending of the various gas stream, particularly as to quantity and temperature, for recirculation into the curing zone.
  • a damper 25 can assist in flow control.
  • a modified form of incineration unit providing for an encompassing arrangement of recycle and gas bypass passageways around an internal combustion zone.
  • the is indicated an internal combustion zone 26 defined by shell 27 which has a gas inlet opening 28 and a downstream open end discharge arrangement into tubular means 29 and into an outlet section 30 connecting to stack means 31.
  • a contaminated gas conduit 32 is indicated as connecting to fan means 33 and the latter discharging into an inlet section 34 which in turn is in open communication with a mixing zone 35 leading to the combustion section inlet 28.
  • a burner 36 is also shown as being positioned within the inlet passageway 28 so as to provide controlled heat for the mixed gas stream entering combustor zone 26, so as to ensure ignition of the fume-laden gas stream.
  • burner 36 is provided with a fuel line 37 and valve means 38 so as to provide controlled quantities of fuel thereto.
  • the admixture of discharged hot gases at a temperature of the order of say 1,350 F. can provide, without particular aid from burner means 36, a mixed gas stream temperature of the order of 1,050 F. whereby ignition will take place and the temperature rise through the length of the combustible zone be held to the order of only 300 F.
  • the present embodiment also indicates the use of shell means 47 at a spaced distance around the combustor shell 27 and the recycle shell 39 to provide a gas bypass passageway 48.
  • the latter has an inlet opening 49 communicating with the fan discharge section 34 and a downstream section which is an open communication with the recirculating gas passageway 45 whereby a portion of the fume-laden gas stream can entirely bypass the incineration zone and be recirculated into the curing zone, drying oven, etc., in admixture with at least a portion of the resulting combustion gases and controlled quantities of preheated air.
  • Various types of flow control means or dampers may be used in connection with the various gas passageways of the thermal incinerator section and for the recirculation to the gas bypass passageway. However, it is not intended to limit the control means to any one type valving, dampers, or regulating apparatus, or to any specific location.
  • Diagrammatically, the present drawing indicates movable damper means 50 at the passageway 41 so as to regulate the quantity of hot gases that may be recycled in passageway 40 and at the same time divert a portion thereof as a hot gas stream passing into the curing zone from the incinerator secton.
  • damper means 51 at the inlet section 49 for the fume bypass 48 so as to control the quantity of gas being directly recirculated to the curing zone without passage into the combustor zone.
  • damper means 51 at the inlet section 49 for the fume bypass 48 so as to control the quantity of gas being directly recirculated to the curing zone without passage into the combustor zone.
  • FIG. 2 effects an extended residence chamber for the combustion section by virtue of the hot gas stream from the combustor zone 26 being connective through tube means 29 to an outlet section 30 which, in turn, connects with the discharge stack,
  • damper or control valve means may be embodied within the design of FIG. 2, as for example, within outlet section 30 or upstream of the heat exchange tubes 29, whereby a more closely controlled gas flow can be obtained.
  • the volume through the incinerator or combustor zone may comprise an amount substantially equivalent to that for bypass passageway 48 or a quantity which is greater or lesser than the amount in the bypass passageway.
  • a substantial quantity of the hot combustion gases leaving the combustor zone 26 shall be recycled by way of passageway 40 back to the combustor inlet so as to provide the higher inlet temperature to such zone to result the desired low-temperature drop in the unit as well as sustain an ignition temperature for the system.
  • FIG. 3 of the drawing there is indicated a modification within the shell defining the combustor zone by reason of shell 27 providing a plurality of spaced-apart, angularly positioned gas inlet means 52 which will permit small portions of the recycle gas stream from passageway 48 to be introduced at spaced points in the combustor zone 26 and, in effect, reduce the output from the burner means as well as keep the temperature rise in the combustor zone to a low differential.
  • the openings 52 as shown are, of course, diagrammatic and can be varied as to number and as to angular relationship with the wall of the combustion zone and still be within the scope of the present invention.
  • a thermal incinerator unit for use in combination with a curing zone discharging combustible fumes, which comprises in combination, an elongated combustion section with a fume inlet opening at one end and a hot gas outlet from the opposite end thereof, an axial-positioned burner means directed into said inlet opening and adjustable fuel supply means to said burner means, gas passageway means from said hot gas outlet to said fume inlet opening to effect a hot gas recycle to the latter at said burner means, additional gas passageway means from said hot gas outlet to the curing zone, and a gas outlet conduit from said hot gas outlet to effect a cleaned gas discharge to the atmosphere, at least one adjustable fresh air inlet means to said unit, and fan means connective with said unit providing flow of fumes into said combustion section and through said passageway and conduit means to maintain gas and fume flows therethrough.
  • thermal incinerator unit of claim 1 further characterized that said gas passageway means for effecting hot gas recycle is provided annularly around said elongated combustion section and in heat exchange relationship therewith.
  • thermal incinerator unit of claim 1 further characterized in that a gas bypass passageway extends longitudinally coextensive with said combustion section and is connective between said fan means and said additional gas passageway means from said hot gas outlet, whereby there may be a recirculation of a fume containing stream to the curing zone without passage through said combustion section.
  • thermal incinerator unit of claim 3 still further characterized in that said bypass passageway is in heat exchange relationship with said hot gas recycle passageway means.
  • thermal incinerator unit of claim 1 further characterized in that a heat exchan e section is provided in communrcation with the hot gas out et from said combustion section and air inlet means to said heat exchange means provides for preheating air thereto, and an outlet from said heat exchange section is in communication with said additional gas passageway means to the curing zone whereby heated fresh air may be admixed with gas from said hot gas outlet.
  • thermal incinerator unit of claim 1 further characterized in that flow control means are provided in combination with the hot gas outlet from said combustion section whereby there may be regulation of the flow gases to said gas passageway means for hot gas recycle and control of gas flow to said additional gas passageway from said hot gas outlet.
  • thermo incinerator unit of claim 1 further characterized in that said gas passageway means from said hot gas outlet to said fume inlet opening is of an annular form around said elongated combustion section and a gas bypass passageway is provided in an annular form around said annular form recycle gas passageway, whereby there is a resulting heat exchange relationship between said gas passageways.
  • thermal incinerator unit of claim 7 still further characterized in that flow control means are provided in said bypass gas passageway whereby to control fume flow from said fan means to said combustion section and to said gas bypass passageway.
  • a thermal incineration section comprising in combination, an elongated open-ended inner shell defining a combustion section with a fume inlet and a hot gas outlet means therefor, an elongated outer shell spaced around said inner shell and providing a recycle passageway for recycle of hot gases, a fume-laden inlet at one end of said outer shell in alignment with the open gas inlet to said inner combustion sections, a fume passageway from said oven to said fume inlet of said combustion section, a burner with fuel supply means thereto positioned centrally within said fume inlet to the latter, an incinerated gas outlet from said outer shell, additional wall means spaced adjacent said outer shell to provide a gas bypass section therearound which is in heat exchange relationship with said outer shell, 3 return passageway means from said bypass section to said oven, and a blower means within said fume passageway to maintain gas flow and gas recirculation within said incineration section and said gas bypass section.
  • the combined oven-thermal incineration section of claim 9 further characterized in that adjustable flow control means is provided within each of said gas passageways and said gas bypass sections, whereby the volume of gas flow can be regulated within each portion of said incineration section.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Incineration Of Waste (AREA)
  • Combustion Of Fluid Fuel (AREA)
US31961A 1970-04-27 1970-04-27 Thermal incineration unit Expired - Lifetime US3604824A (en)

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US3196170A 1970-04-27 1970-04-27

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JP (1) JPS5024790B1 (enrdf_load_stackoverflow)
CA (1) CA932643A (enrdf_load_stackoverflow)
DE (2) DE7115807U (enrdf_load_stackoverflow)
FR (1) FR2090780A5 (enrdf_load_stackoverflow)
GB (1) GB1340565A (enrdf_load_stackoverflow)

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US3757427A (en) * 1970-10-30 1973-09-11 B & K Machinery Int Ltd Method and apparatus for drying solvents
US3829985A (en) * 1972-06-23 1974-08-20 Western Electric Co Apparatus for drying pulp-insulated wire
US3882613A (en) * 1974-05-20 1975-05-13 Joseph M Wilson Clothes dryer
US3882612A (en) * 1973-07-27 1975-05-13 Moore Dry Kiln Co Method and apparatus for limiting the concentration of combustible volatiles in dryer emissions
US3936951A (en) * 1973-08-24 1976-02-10 Otto Durr Kg Method of and apparatus for heating circulating air in drying equipment
US3942264A (en) * 1972-11-09 1976-03-09 Kurt Zenkner Method for thermal afterburning of exhaust air from industrial working plants and device for carrying out this method
US4065251A (en) * 1976-08-03 1977-12-27 Associated Electrical Industries Limited Furnaces
US4089629A (en) * 1975-02-12 1978-05-16 Pietro Fascione Process and apparatus for controlled recycling of combustion gases
US4098567A (en) * 1976-10-01 1978-07-04 Gladd Industries, Inc. Recirculating processing oven heater
US4199549A (en) * 1964-05-07 1980-04-22 Salem Corporation Method of operating an incinerator
US4253822A (en) * 1977-10-06 1981-03-03 Courtaulds Limited Drying wood pulp
US4324545A (en) * 1980-09-22 1982-04-13 Gladd Industries, Inc. Recirculating heater for processing oven
US4384850A (en) * 1981-06-17 1983-05-24 Tri-Mark Metal Corporation Recirculating air heater
US4441880A (en) * 1981-04-23 1984-04-10 Pownall Spencer Engineering, Ltd. Drying apparatus
US4445842A (en) * 1981-11-05 1984-05-01 Thermal Systems Engineering, Inc. Recuperative burner with exhaust gas recirculation means
US4448578A (en) * 1982-04-30 1984-05-15 Acrometal Products, Inc. Curing oven for enameled wire and control system therefor
US4460331A (en) * 1983-05-12 1984-07-17 Haden Schweitzer Corporation Fume incineration for paint drying oven
US4548579A (en) * 1983-08-01 1985-10-22 Blu-Surf, Inc. Compound reducing oven
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US4678433A (en) * 1985-12-30 1987-07-07 Hunter Engineering (Canada) Ltd. Oven system having a heated snout at its entrance end
US4702892A (en) * 1985-07-25 1987-10-27 Betz Erwin C Heat recuperative catalytic oxidation device
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CN107702511A (zh) * 2017-11-23 2018-02-16 黄石市建材节能设备总厂 一种内循环洁净型煤干燥机
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US4615674A (en) * 1985-09-13 1986-10-07 Wolverine Corporation Incinerator system
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GB8617045D0 (en) * 1986-07-12 1986-08-20 Mckechnie Metals Ltd Drying swarf &c
DE3729971A1 (de) * 1987-09-08 1989-03-16 Wuenning Joachim Heissgaserzeugungseinrichtung mit thermischer nachverbrennung
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DE102010017239B4 (de) * 2010-06-04 2017-09-21 Océ Printing Systems GmbH & Co. KG Vorrichtung und Verfahren zum Fixieren von Druckbildern auf einem Aufzeichnungsträger
CN106610024A (zh) * 2017-02-10 2017-05-03 东莞市太阳线缆设备有限公司 一种漆包机废气处理装置
CN107677063B (zh) * 2017-11-23 2023-06-16 湖北金炉节能股份有限公司 一种安全节能洁净型煤干燥系统

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Patent Citations (3)

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Cited By (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199549A (en) * 1964-05-07 1980-04-22 Salem Corporation Method of operating an incinerator
US3757427A (en) * 1970-10-30 1973-09-11 B & K Machinery Int Ltd Method and apparatus for drying solvents
US3829985A (en) * 1972-06-23 1974-08-20 Western Electric Co Apparatus for drying pulp-insulated wire
US3942264A (en) * 1972-11-09 1976-03-09 Kurt Zenkner Method for thermal afterburning of exhaust air from industrial working plants and device for carrying out this method
US3882612A (en) * 1973-07-27 1975-05-13 Moore Dry Kiln Co Method and apparatus for limiting the concentration of combustible volatiles in dryer emissions
US3936951A (en) * 1973-08-24 1976-02-10 Otto Durr Kg Method of and apparatus for heating circulating air in drying equipment
US3882613A (en) * 1974-05-20 1975-05-13 Joseph M Wilson Clothes dryer
US4089629A (en) * 1975-02-12 1978-05-16 Pietro Fascione Process and apparatus for controlled recycling of combustion gases
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Also Published As

Publication number Publication date
DE2120022B2 (de) 1973-03-01
FR2090780A5 (enrdf_load_stackoverflow) 1972-01-14
DE2120022C3 (de) 1973-09-20
CA932643A (en) 1973-08-28
JPS5024790B1 (enrdf_load_stackoverflow) 1975-08-19
DE7115807U (de) 1971-07-22
DE2120022A1 (de) 1971-11-11
GB1340565A (en) 1973-12-12

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