CA1305894C - Centralized system for the treatment of soiled waste materials from hospitals - Google Patents
Centralized system for the treatment of soiled waste materials from hospitalsInfo
- Publication number
- CA1305894C CA1305894C CA000584854A CA584854A CA1305894C CA 1305894 C CA1305894 C CA 1305894C CA 000584854 A CA000584854 A CA 000584854A CA 584854 A CA584854 A CA 584854A CA 1305894 C CA1305894 C CA 1305894C
- Authority
- CA
- Canada
- Prior art keywords
- materials
- steam
- receiving
- waste
- pressure steam
- 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 - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
- F01K3/24—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by separately-fired heaters
- F01K3/247—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters with heating by separately-fired heaters one heater being an incinerator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/006—General arrangement of incineration plant, e.g. flow sheets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/10—Combustion in two or more stages
- F23G2202/101—Combustion in two or more stages with controlled oxidant supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/10—Combustion in two or more stages
- F23G2202/102—Combustion in two or more stages with supplementary heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/10—Combustion in two or more stages
- F23G2202/103—Combustion in two or more stages in separate chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2205/00—Waste feed arrangements
- F23G2205/10—Waste feed arrangements using ram or pusher
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2205/00—Waste feed arrangements
- F23G2205/14—Waste feed arrangements using hopper or bin
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/20—Medical materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
ABSTRACT
A centralized system for the treatment of soiled and waste material from hospitals in a region includes an incinerator for destroying waste materials, a waste heat boiler generating high pressure steam using combustion gases from the incinerator, a turbine generator using the high pressure steam to generate electricity and low pres-sure steam, and a steam laundry using the electricity and low pressure steam to launder soiled recyclable material such as bed linen and clothing.
A centralized system for the treatment of soiled and waste material from hospitals in a region includes an incinerator for destroying waste materials, a waste heat boiler generating high pressure steam using combustion gases from the incinerator, a turbine generator using the high pressure steam to generate electricity and low pres-sure steam, and a steam laundry using the electricity and low pressure steam to launder soiled recyclable material such as bed linen and clothing.
Description
~3~58~
This invention relates to the treatment of soiled and waste materials from hospitals and oth~r sources of biomedical waste materials.
Proper disposal of medical waste materials from hospitals and other sources has become a matter of increasing concern in recent years. A most effective way of disposing of such materials has been incineration, but it is difficult to ensure that incineration facilities operate and many do not produce a sufficiently steady supply to permit cost effective and efficient incineration with proper controls to avoid discharge of harmful emissions.
Most hospitals have steam laundries for the laundering and recycling of soiled material such as bed linen, gowns, etc. which can be reused. Such facilities require a supply of low pressure steam, usually obtained from a central heating plant.
It is known in large incineration plants to use a waste boiler to recover heat from waste gases from the incinerator, steam from the boiler being utilized to drive a turbine yenerator producing electricity or used to provide other steam requirements such as supplementing the steam requirements of a hospital.
Typical examples of modern incinerators are described in a brochure published by Ecolaire Canada Ltd.
entitled "Institutional-Industrial-Municipal Incineration and Energy Recovery Systems". This brochure suggests at page 10 that a hospital can supplement its steam supply for laundry and heating purposes by heat recovery from an incinerator.
Typical examples of turbine generators are described in a brochure "Elliott Turbine - Generators" published by Elliott Company.
~3~5l5~4 It is an object of the present invention to provide safer and more efficient handling of soiled medical and other and waste materials from hospitals and other sources of biomedical waste. We have determined that, by centralizing the incineration of medical wastes from a group of hospitals and other facilities producing solid waste in a given area and centralizing the laundry facilities for the hospitals and possibly other institu-tions at the same site, not only can the expected economics of scale associated with centralization be achieved, but a more efficient thermal cycle can be utilized to achieve greater energy savings. Furthermore, handling facilities ~`or soiled materials can be automated to a greater extent, thus reducing the risk to operating personnel, and reducing the numher of persons exposed to risk.
According to the invention, there is provided a method for the centralized treatment of soiled launderable and waste materials from a group of hospitals and other sources of biomedical and biomedically tainted materials, comprising:
a) separately conveying to a treatment site both materials which can be recycled by laundering and materials which must be destroyed;
b) incinerating said materials to be destroyed in a two stage inc:ineration process, in a first stage of which the materials are combusted under oxygen deficit condi-tions, and volatile constituents are separated from solid residues, and in a second stage of which the volatile constituents are combusted under oxygen surplus condi-tions, c) passing waste gas from said second incinerationstage through a waste heat boiler to generate high pressure steam;
d) reducing the pressure of said steam whilst recovering energy therefrom by passing it through a steam turbine coupled to an electrical generator, so as to provide low pressure steam; and e) using said low pressure steam to steam launder said materials which can be recycled by laundering.
The invention also extends to apparatus for carrying out the above method~
It will be noted that waste heat fxom the inciner-ator is used to generate high pressure steam which is used to generate electricity, exhaust steam from ~he turbine being utilized to operate the laundry, thus enabling more effective energy recovery than when low pressure steam is generated directly.
Further features of the invention will become ap-parent from the following description of a presently preferred embodiment of the invention.
In the drawings:
Figure l is a schematic diagram of a centralized plant in accordance with the invention or the treatment of soiled and waste materials from a group of hospitals; and Figure 2 is a flow diagram illustrating the operation of an exemplary embodiment of the invention.
Referring to Figure 1, waste material from a group of hospitals is trucked to a treatment site, and the bulk of it, compr:ising relatively low risk general waste, is discharged into a hopper 2, from which it is fed into a first chamber 4 of an incinerator 6 by a ram feeder 8 at a rate such as to maintain a reasonably constant thermal input to the system, whilst air or a mixture of air and steam is fed to the chamber at a rate such that complete combustion cannot take place. A second hopper 3, feeding directly into the chamber 4, is provided for the disposal of high risk or waste which will only form a minor portion of the waste material received.
A further ram expels ash from the first chamber into a water filled ash pit from which it may be recovered for disposal, whilst gases from th~ first chamber are passed to a second combustion chamber 10 in which excess addition-al combustion air is added so as to complete combustion.
Gas burners are provided in the first and second chambers 131~58~4 to enable optimum operating temperatures to be attained during start up and maintained during operation. Further details of typical operation and control of such an in-cinerator are to be found in the Ecolaire brochure to which reference is made above.
Waste gases from the incinerator are passed to a waste heat boiler 12 generating steam at relatively high pressure, typically 600 psig, and this steam is fed to a steam turbine 14 coupled to an electrical generator 16.
Exhaust steam from the turbine is piped to the laundry described further below. Çases from the waste heat boiler are passed through a scrubber and absorption column 18 and are exhausted to a stack 20 by a fan 21 through a bag house (not shown). These gas cleaning stages are conven-tionally engineered to meet applicable environmentalstandards and their design forms no part of the present inventlon .
In the laundry, soiled materials are shipped to the plant in laundry carts 22, whose contents are weighed at a weigh station 24 and charged into a washing machine 26, using water heated by or condensed from exhaust steam from the turbine. After preliminary water extraction, the materials are sorted in a sorting station 28 and if not requiring ironing are tumble dried in a steam heated tumble dryer 30 and a steam heated finish dryer 32, whereafter they are folded at a folding station 34, and wrapped at a wrapping station 36. Items requiring ironing are passed through a steam heated ironing machine 37 to the folding or wrapping station. The tumble dryer may be provided with a heat reclaim wheel 31 in order to improve its thermal efficiency.
Ir the meanwhile, the carts 22 are passed through a steam cleaning station 38, and receive wrapped laundry from the wrapping machine ready for return to their original source.
A simplified flow diagram for an exemplary installa-tion of the apparatus is shown in Figure 2. This assumes 13~8~
an input of 2000 tons/per year of bio-medical wasted to the incinerator 6, which for the purposes of this example is presumed to operate 12 hours per day, 5 days per week, equivalent to about 640 lbs/hour. The flue gases pass through the waste heat boiler 12, generating about 4700 lbs/hour of high pressure steam which is applied to the turbine 14 driving the generator 16 to produce about 120 kw of electric power, and about 4000 lb/hour of low pres-sure steam for use in the laundry 40. Condensate from the various steam heaters used in the laundry 40 is recycled to a water treatment plant 42 together with make up water to provide a feed of about 9 gallons per minute to the waste heat boiler 12. About 16 gallons per minute of make up water, which may contain chemicals such as alkali to neutralize acid gas components, are fed to the gas scrubber, whilst about 1 gallon per minute of residue is fed to the ash pit together with ash from the inciner-ator 6. The laundry will process about 1200 pounds of material (bed linen, etc.) per hour.
It should of course be understood that all of the above figures are exemplary only and approximate. A fair degree of flexibility in operation is obtainable for equipment of a given size and rating both by varying the rate of throughput of waste materia], and by adjusting the hours of operation of the apparatus. It is believed that the electrical output of the system should in a typical installation approximately equal the electrical require-ment. It is also desirable to provide for any net surplus to be returned to the supply grid. An external electrical supply will certainly be necessary during startup of the apparatus and when the apparatus is not in operation, as will an uninterruptable emergency supply to maintain proper control of operation of the incinerator in the event of a power outage. A gas or other fuel supply to the incinerator is also rec~uired for startup, and supplying the burners which maintain correct combustion conditions in the two chambers during operation.
~3~
Although the apparatus and method described is dependent upon having a group of hospitals as its major source of material to be treated, it can advantageously also handle supplementary bio-medical wastes from other sources such as laboratories, as well as laundry from other institutions. Furthermore, municipal and other wastes may be processed if this will assist in efficient operation.
This invention relates to the treatment of soiled and waste materials from hospitals and oth~r sources of biomedical waste materials.
Proper disposal of medical waste materials from hospitals and other sources has become a matter of increasing concern in recent years. A most effective way of disposing of such materials has been incineration, but it is difficult to ensure that incineration facilities operate and many do not produce a sufficiently steady supply to permit cost effective and efficient incineration with proper controls to avoid discharge of harmful emissions.
Most hospitals have steam laundries for the laundering and recycling of soiled material such as bed linen, gowns, etc. which can be reused. Such facilities require a supply of low pressure steam, usually obtained from a central heating plant.
It is known in large incineration plants to use a waste boiler to recover heat from waste gases from the incinerator, steam from the boiler being utilized to drive a turbine yenerator producing electricity or used to provide other steam requirements such as supplementing the steam requirements of a hospital.
Typical examples of modern incinerators are described in a brochure published by Ecolaire Canada Ltd.
entitled "Institutional-Industrial-Municipal Incineration and Energy Recovery Systems". This brochure suggests at page 10 that a hospital can supplement its steam supply for laundry and heating purposes by heat recovery from an incinerator.
Typical examples of turbine generators are described in a brochure "Elliott Turbine - Generators" published by Elliott Company.
~3~5l5~4 It is an object of the present invention to provide safer and more efficient handling of soiled medical and other and waste materials from hospitals and other sources of biomedical waste. We have determined that, by centralizing the incineration of medical wastes from a group of hospitals and other facilities producing solid waste in a given area and centralizing the laundry facilities for the hospitals and possibly other institu-tions at the same site, not only can the expected economics of scale associated with centralization be achieved, but a more efficient thermal cycle can be utilized to achieve greater energy savings. Furthermore, handling facilities ~`or soiled materials can be automated to a greater extent, thus reducing the risk to operating personnel, and reducing the numher of persons exposed to risk.
According to the invention, there is provided a method for the centralized treatment of soiled launderable and waste materials from a group of hospitals and other sources of biomedical and biomedically tainted materials, comprising:
a) separately conveying to a treatment site both materials which can be recycled by laundering and materials which must be destroyed;
b) incinerating said materials to be destroyed in a two stage inc:ineration process, in a first stage of which the materials are combusted under oxygen deficit condi-tions, and volatile constituents are separated from solid residues, and in a second stage of which the volatile constituents are combusted under oxygen surplus condi-tions, c) passing waste gas from said second incinerationstage through a waste heat boiler to generate high pressure steam;
d) reducing the pressure of said steam whilst recovering energy therefrom by passing it through a steam turbine coupled to an electrical generator, so as to provide low pressure steam; and e) using said low pressure steam to steam launder said materials which can be recycled by laundering.
The invention also extends to apparatus for carrying out the above method~
It will be noted that waste heat fxom the inciner-ator is used to generate high pressure steam which is used to generate electricity, exhaust steam from ~he turbine being utilized to operate the laundry, thus enabling more effective energy recovery than when low pressure steam is generated directly.
Further features of the invention will become ap-parent from the following description of a presently preferred embodiment of the invention.
In the drawings:
Figure l is a schematic diagram of a centralized plant in accordance with the invention or the treatment of soiled and waste materials from a group of hospitals; and Figure 2 is a flow diagram illustrating the operation of an exemplary embodiment of the invention.
Referring to Figure 1, waste material from a group of hospitals is trucked to a treatment site, and the bulk of it, compr:ising relatively low risk general waste, is discharged into a hopper 2, from which it is fed into a first chamber 4 of an incinerator 6 by a ram feeder 8 at a rate such as to maintain a reasonably constant thermal input to the system, whilst air or a mixture of air and steam is fed to the chamber at a rate such that complete combustion cannot take place. A second hopper 3, feeding directly into the chamber 4, is provided for the disposal of high risk or waste which will only form a minor portion of the waste material received.
A further ram expels ash from the first chamber into a water filled ash pit from which it may be recovered for disposal, whilst gases from th~ first chamber are passed to a second combustion chamber 10 in which excess addition-al combustion air is added so as to complete combustion.
Gas burners are provided in the first and second chambers 131~58~4 to enable optimum operating temperatures to be attained during start up and maintained during operation. Further details of typical operation and control of such an in-cinerator are to be found in the Ecolaire brochure to which reference is made above.
Waste gases from the incinerator are passed to a waste heat boiler 12 generating steam at relatively high pressure, typically 600 psig, and this steam is fed to a steam turbine 14 coupled to an electrical generator 16.
Exhaust steam from the turbine is piped to the laundry described further below. Çases from the waste heat boiler are passed through a scrubber and absorption column 18 and are exhausted to a stack 20 by a fan 21 through a bag house (not shown). These gas cleaning stages are conven-tionally engineered to meet applicable environmentalstandards and their design forms no part of the present inventlon .
In the laundry, soiled materials are shipped to the plant in laundry carts 22, whose contents are weighed at a weigh station 24 and charged into a washing machine 26, using water heated by or condensed from exhaust steam from the turbine. After preliminary water extraction, the materials are sorted in a sorting station 28 and if not requiring ironing are tumble dried in a steam heated tumble dryer 30 and a steam heated finish dryer 32, whereafter they are folded at a folding station 34, and wrapped at a wrapping station 36. Items requiring ironing are passed through a steam heated ironing machine 37 to the folding or wrapping station. The tumble dryer may be provided with a heat reclaim wheel 31 in order to improve its thermal efficiency.
Ir the meanwhile, the carts 22 are passed through a steam cleaning station 38, and receive wrapped laundry from the wrapping machine ready for return to their original source.
A simplified flow diagram for an exemplary installa-tion of the apparatus is shown in Figure 2. This assumes 13~8~
an input of 2000 tons/per year of bio-medical wasted to the incinerator 6, which for the purposes of this example is presumed to operate 12 hours per day, 5 days per week, equivalent to about 640 lbs/hour. The flue gases pass through the waste heat boiler 12, generating about 4700 lbs/hour of high pressure steam which is applied to the turbine 14 driving the generator 16 to produce about 120 kw of electric power, and about 4000 lb/hour of low pres-sure steam for use in the laundry 40. Condensate from the various steam heaters used in the laundry 40 is recycled to a water treatment plant 42 together with make up water to provide a feed of about 9 gallons per minute to the waste heat boiler 12. About 16 gallons per minute of make up water, which may contain chemicals such as alkali to neutralize acid gas components, are fed to the gas scrubber, whilst about 1 gallon per minute of residue is fed to the ash pit together with ash from the inciner-ator 6. The laundry will process about 1200 pounds of material (bed linen, etc.) per hour.
It should of course be understood that all of the above figures are exemplary only and approximate. A fair degree of flexibility in operation is obtainable for equipment of a given size and rating both by varying the rate of throughput of waste materia], and by adjusting the hours of operation of the apparatus. It is believed that the electrical output of the system should in a typical installation approximately equal the electrical require-ment. It is also desirable to provide for any net surplus to be returned to the supply grid. An external electrical supply will certainly be necessary during startup of the apparatus and when the apparatus is not in operation, as will an uninterruptable emergency supply to maintain proper control of operation of the incinerator in the event of a power outage. A gas or other fuel supply to the incinerator is also rec~uired for startup, and supplying the burners which maintain correct combustion conditions in the two chambers during operation.
~3~
Although the apparatus and method described is dependent upon having a group of hospitals as its major source of material to be treated, it can advantageously also handle supplementary bio-medical wastes from other sources such as laboratories, as well as laundry from other institutions. Furthermore, municipal and other wastes may be processed if this will assist in efficient operation.
Claims (4)
1. Apparatus for the centralized treatment of soiled and waste materials from a plurality of hospitals and other sources of biomedical and biomedically tainted materials, comprising:
a) first receiving means for receiving from a plurality of sources soiled materials which can be recycled by laundering:
b) second receiving means for receiving from a plurality of sources soiled and waste materials which require to be destroyed, c) an incinerator having:
(i) a first combustion chamber receiving materials from said second receiving means, said first chamber having means to provide a metered quantity of combus-tion air to said chamber insufficient for full combustion of said materials, and means to separate solid residues from gaseous products of combustion of said materials; and (ii) a second combustion chamber receiving said gaseous products, said second chamber having means to provide at least sufficient additional combustion air to ensure complete combustion of said gaseous components, d) a waste heat boiler receiving exhaust gases from said second combustion chamber and generating high pressure steam;
e) a turbine generator receiving said high pressure steam and outputting electricity and low pressure steam;
and f) a steam laundry receiving materials from said first receiving means and low pressure steam from said generator.
a) first receiving means for receiving from a plurality of sources soiled materials which can be recycled by laundering:
b) second receiving means for receiving from a plurality of sources soiled and waste materials which require to be destroyed, c) an incinerator having:
(i) a first combustion chamber receiving materials from said second receiving means, said first chamber having means to provide a metered quantity of combus-tion air to said chamber insufficient for full combustion of said materials, and means to separate solid residues from gaseous products of combustion of said materials; and (ii) a second combustion chamber receiving said gaseous products, said second chamber having means to provide at least sufficient additional combustion air to ensure complete combustion of said gaseous components, d) a waste heat boiler receiving exhaust gases from said second combustion chamber and generating high pressure steam;
e) a turbine generator receiving said high pressure steam and outputting electricity and low pressure steam;
and f) a steam laundry receiving materials from said first receiving means and low pressure steam from said generator.
2. Apparatus according to claim 1, including means to introduce particularly hazardous waste material directly into said first combustion chamber without passing through said second receiving means.
3. Apparatus according to claim 1 wherein said first receiving means are laundry carts, and the steam laundry includes a steam washing machine receiving materials from said carts, a steam cleaning station from said carts, and drying and finishing stations receiving materials from said washing machine and discharge them into laundry carts from said steam cleaning station.
4. A method for the centralized treatment of soiled laundry and waste materials from a group of hospitals and other sources of medical and medically tainted and other waste materials, comprising:
a) separately conveying to a treatment side both materials which can be recycled by laundering and materials which must be destroyed;
b) incinerating said materials to be destroyed in a two stage incineration process, in a first stage of which the materials are combusted under oxygen deficit condi-tions, and volatile constituents are separated from solid residues, and in a second stage of which the volatile constituents are combusted under oxygen surplus condi-tions, c) passing waste gases from said second incinera-tion stage through a waste heat boiler to generate high pressure steam;
d) reducing the pressure of said steam whilst recovering energy therefrom by passing it through a steam turbine coupled to an electrical generator, so as to provide electrical power and low pressure steam; and e) using said low pressure steam to steam launder said materials which can be recycled by laundering.
a) separately conveying to a treatment side both materials which can be recycled by laundering and materials which must be destroyed;
b) incinerating said materials to be destroyed in a two stage incineration process, in a first stage of which the materials are combusted under oxygen deficit condi-tions, and volatile constituents are separated from solid residues, and in a second stage of which the volatile constituents are combusted under oxygen surplus condi-tions, c) passing waste gases from said second incinera-tion stage through a waste heat boiler to generate high pressure steam;
d) reducing the pressure of said steam whilst recovering energy therefrom by passing it through a steam turbine coupled to an electrical generator, so as to provide electrical power and low pressure steam; and e) using said low pressure steam to steam launder said materials which can be recycled by laundering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000584854A CA1305894C (en) | 1988-12-02 | 1988-12-02 | Centralized system for the treatment of soiled waste materials from hospitals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000584854A CA1305894C (en) | 1988-12-02 | 1988-12-02 | Centralized system for the treatment of soiled waste materials from hospitals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1305894C true CA1305894C (en) | 1992-08-04 |
Family
ID=4139217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000584854A Expired - Fee Related CA1305894C (en) | 1988-12-02 | 1988-12-02 | Centralized system for the treatment of soiled waste materials from hospitals |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1305894C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018073233A1 (en) * | 2016-10-17 | 2018-04-26 | Reused Remade Ab | Method and system of making a plurality of bags, and bag |
-
1988
- 1988-12-02 CA CA000584854A patent/CA1305894C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018073233A1 (en) * | 2016-10-17 | 2018-04-26 | Reused Remade Ab | Method and system of making a plurality of bags, and bag |
| CN109844206A (en) * | 2016-10-17 | 2019-06-04 | 再利用再制造有限公司 | Make multiple bags of method and system and a kind of bag |
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| MKLA | Lapsed |