CA1285179C - Method for controlling incineration in combustor for radioactive wastes - Google Patents
Method for controlling incineration in combustor for radioactive wastesInfo
- Publication number
- CA1285179C CA1285179C CA000548820A CA548820A CA1285179C CA 1285179 C CA1285179 C CA 1285179C CA 000548820 A CA000548820 A CA 000548820A CA 548820 A CA548820 A CA 548820A CA 1285179 C CA1285179 C CA 1285179C
- Authority
- CA
- Canada
- Prior art keywords
- combustor
- supplemental fuel
- fed
- flow rate
- waste
- 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
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Abstract
ABSTRACT
Complete incineration of combustible radioactive waste in a combustor is regulated by controlling the flow rate of supplemental fuel fed to the combustor so that the outlet gas temperature of the combustor may be maintained at a predetermined temperature while increasing or decreasing the supply of waste to the combustor in direct response to an increase or decrease of the flow rate.
Complete incineration of combustible radioactive waste in a combustor is regulated by controlling the flow rate of supplemental fuel fed to the combustor so that the outlet gas temperature of the combustor may be maintained at a predetermined temperature while increasing or decreasing the supply of waste to the combustor in direct response to an increase or decrease of the flow rate.
Description
~ETHOD FOR CONTROI.LING INCINERATIO~
IN CONBUSTOR E~'OR RADIOACTIV~ WASTES
BACKGROUND OF THE INVENTION
This invention relates to a method for controlling incinaration in a combustor for low-level radioactive wastes, and in more detaLl relates to a method for economizing the consumption o~ supplemental fuel whlle maintaining the incineration state in the combustor stable, by controlling the amount o~
said supplemental fuel and the amount Ole said radioactive wautea fed to the combustor.
Combustible low-level radloactive wastes exhausted from nuclear energy plants and atomlc enerey laboratories lnclude polyethylene sheets, paper, cloths, tlmber and the like. It i~ known that on dispo~al o~ these wastes1 lt i8 most effective to incinerate the wastes through the aid of a liquid ~uel such a~ kerosene, light oil, LNG, LPG or waste oil, and reduce kheir volume.
For incineration o the radloactive wastes, there i9 Kenerally known a combustor that i9 maintained at a ne~ative static pressure an~ normally comprises three combustion chambers maintained in an excess air envlronment.
The wastes are burned as they pass through the combustion chambers in a cyclonic flow pattern.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. l is a cross-sectional view illustrating one embodiment of the combustor for radioactive wastes wherein incineration 19 controlled by the prior art.
Fig. 2 is a cross-sectional view illustrating one embodiment of the combustor for radioactive wastes wherein incineration is controlled by the method of this invention.
In Fig. l, a ~irst combustion chamber 2 of a combustor l ls ed with primary air, supplemental fuel and radioactive wastes respectively from three inlets 3, 4, 6, and ~urther with secondary ir from an inlet 5, thereby forming a cyclonic low. At this stage, the wastes are ignited and move to a second combustion chamber 7. In said second combustion chamber 7, most combustible PAT 11482-l _ ~, _ '' wastes are completely incinerated, and their ashes fall to the bottom of the combustor. Some wastes, which are more difficult to burn, are incinerated at the bottom of the combustor. A third combustion chamber 8 partitioned from the second combustion chamber 7 by a wall i5 a zone designed to complete the removal of the heavier particles from the flue gas and provide sufelcient residence time for complete combustion.
When incinerating radioactive wastes in the combustor, aY a matter of course, it is preferable to incinerate the wastes completely, possibly by consuming a small amount of supplemental fuel to maintain the incineration state in the combustor stable during the period ~f lncineratlon. Accordlngly, the prior art has employed a method for m~lntninin~ the outl~t gas t~mperature of the combustor at a certaln target value as shown irl ~lg, 1, which comprises the steps of detecting an outlet gas temperature of the combustor by means of a thermometer 9, sending it slgnal to a temperature-indicator controller ~'~'IC) 10, driving, for instance, a diaphragm valve 11 at the outlet of said controller, and decreasing or increasing the amount of supplemental fuel fed to the combustor, wherein 815 + 15C is Generally selected as said target value.
This method for controlling incineration i9 designed to maintain the amount of waste fed to the combustor per unit of time uniform, and increase or reduce the supply of supplemental fuel in correspondence with a rise and fall of the outlet gas temperature of the combustor. This method is effective for the purpose of maintaining the incineration state stable, so far as the heat~ng value of wastes fed to the combustor is unchanged.
However, the radioactive wastes to be incinerated can vary, and also their heating value and bulk density depending upon type. In this connection, it is to be noted that when comparing paper with polyethylene, the former is inferior in heatlng value and bulk density to the latter. Accordingly, the usual incineration control method is disadvantageous in that when waste is fed to the combustor in a uniform amount per unit of time, for instance, said waste consisting malnly of paper, complete inclneration of waste can be achieved even when the supply of supplemental fuel is small, but as the heating value of the waste is small, needless supplemental fuel i9 fed to the com~ustor and consumed. In the case where the waste to be incinerated consists mainly of polyethylene, the usual incineration control method encounters different problems such as fusion of ashes and the like due to the fact that since its - . .
'`'' .
~5~79 heating value and bulk density are consp:lcuo-lsly large a~ compared with papor,the heating value ~enerated in the combustor a1so becomes extremely large, thereby making it difficult to maintain a normal incineration state. In addition, this lncineration control method i9 dlsadvantageous in that slnce every time the content of waste fed to the combustor i9 changed, the heating value thereof is al90 changed, hunting takes place every time that the content of waste fed to the combustor is changed, and so it becomes extremely difficult to msintain a stable state of complete Lncineration.
On the other hand, there has also been used an incineration control method for maintainin~ the outlet gas temperature of the combu~tor unlform which comprises setting the amount of supplemental fuol fed to the combustor, and controllin~ the amount of waste fed to the combustor alone, wherein, however, since the burning rate of waste 19 slower than that of the supplemental Puel, the tlme la~ untll the change in the supply of waste appears in the form o~ a change in the outlet gas temperature of the combustor, ls long. Therefore, this lncineratlon control method i9 liable to cause hunting, and so can never incinerate the wastes stably and completely.
SUMMARY OF THE INVh'NTION
~0 This invention provides a method for controlling incineration in a combustor for radioactive wastes which comprises, on incinaratln~ combustlbls radioactive wastes using a fluid supplemental fuel ln sa~d combustor, detectlng an outlet gas temperature of said combustor by mean3 of a thermometer whareln when said detected temperature is hi~her than a set temperature, the amount of supplemental fuel fed to the combustor is reduced and when the detected temperature is lower than said set temperature, said amount of supplemental fuel fed to the combustor is increased; as well as detecting the flow rate of supplemental fuel fed to the combustor by means of a flow meter: wher0in when said detected flow rate decreases, the amount of radioactiva wasta fed to the combustor is decreased and when the detected flow rate increases, the amount of radioactive waste fed to the combu~tor is increased.
lrh8s~ 9 DETAILED DESCRIPrION OF THE I~VENTIO~
In Fig. 2, a flrst combustion chamber 22 of a combustor ~1 i8 fed w~th primary air, supplemental fuel and radioactlve wastes respectively from thre~
inlets 23, 2b, 26 and further with secondary air from an inlet 25. These are well mixed with said supplemental fuel and radioactive wastes to thereby form a cyclonic flow. At this stage, the waste begins to ignite and Pall to a ~econd combustion chamber 28. In said second combustion chamber, a reverse air flow, opposing the flow of the first combustlon chamber, is produced from an inlet 27. In the second combustion chamber 28, most combustlble wastes are completely lncinerated and some ashes all to the bottom of the combustor.
Some of the waste, which is mora dlfficult to burn, ls lncin~rated at the bottom of tho combustor. A third combusti.on chamber 29 provlded as a "V"
shaped corrldor ad~acent the second combustion chamber 28, i~ a zone designed to completo the removal Oe the heavler particles from the ~lue gas flowed thereinto an,d provlde combustible wastes with sufflclent re~ldence time, Additlonal air is in~ected into the bottom of the combustor from an inlet 30, and the particles having fallen to the bottom can continue to burn, supported by said additional air. As the supplemental fuel alding in the incineration of th0 waste, there are generally used various llquid fuels such as kerosene, light oil, LNG, LPG, waste oil or the like.
The incineration controlling method of this invention is applicable to the above mentioned combustor for radioactive wastes. Simply speaking, the incineration control method of this invention is designed to control the supply of supplemental fuel so that the outlet gas temperature of the combustor may be maintained uniformly, and increase or decrease the amount of waste fed to the combustor in response to an increase or decrease in the supply of supplemental fuel. In other words, the amount of waste fed to the combustor is controlled 50 that the supply nf supplemental fuel may become nearly uniform. It is known from experience that with the conditions that the oxygen concentration in the outlet gas of the combustor is 10~ or more and the outlet gas temperature is maintained to be at lea~t 815 i 15C, combustible wastes fed to the combustor, irrespective of kind, can be completely incinerated. In the incineration controlling method of this invention, accordingly, the outlet gas temperature of the combustor is detected by means of a temperature-indicator element (TE) PAI 11482-l ': ;
'3 and said ~etected temperature i9 sent to a temperature-indicator controller (TIC) as shown in Fig. 2. TLC generaliy output3 Q signal according to proportional ~ integral + derivstive control to drive for inatance a diaphragm valve included in a supplemental fuel supply line. In other words, in the case where the detected tsmperature is lower than the set value of the outlet Bas temperature of the combustor, namely 815 + 15C, the opening of said diaphragm valve i9 enlarged to increase the supply of supplemental fuel fed to the combustor, while in the case whare the detected temperflture is higher, the opening of said valve is reduced to decrease the supply of supplemental fuel.
The procedure of detecting the outlet gas3 temperature of the combustor and increasing or decreasing the supply of supplemental fuel according to the detected temperature for the purpose of maintalning the outlet gas temperature at the predetermlned set temperature, hasl also been employed in the usual incineration controlllng method illustrated in Flg. 1. In this connection, it is to be noted that the incineration controlling method of this ~nvention i8 designed to control the supply of supplemental fuel as well as the amount of radioactive wastes fed to the combustor according to the flow rate of the supplemental fuel. As shown in Pig. 2, a flow meter ~PE) disposed in the supplemental fuel supply line detects the flow rate of supplemental fuel and sends it to a flow-indicator controller (FIC). In the case where the detected flow rate sent from FE increases, FIC outputs a signal respondlng to its increase. Said signal is sent to a speed controller ~SC) for heightening the rotating speed (N) of a motor for driving a screw feeder of wQste to increase the amount of waste fed to the combustor, thereby controlling the increase in the flow rate of supplemental fuel. In the case where the detected slgnal ~ent from FE decreases, contrarily, FIC lowers the rotating spee~ tN) of the motor M, for driving the screw feeder of waste according to the decrease in said signal, thereby decreasing the amount of waste fed to the combustor. It iæ
also possible to adjust the amount of waste fed to the combustor according to the same procedure aR mentioned above except that the signal from SC is sent to a motor U2 for drlving a rotary valve disposed downstream of the screw feeder in the place of the motor Ml.
Lowering of the outlet gas temperature of the combustor below the set temperature suggests that the total heating value of waste fed to the combustor plus supplemental fuel is small. In the method of this invention, when the _ 5 _ ~ ~85~3 outlet gas temperature of the combustor 19 lower than the set temperature, first of all the flow rate of the supplementQl fuel, which has a high burning rate, to the combustor is enhanced and thus the outlet gas temperature of the combustor is ralsed up to the set temperature, whereby worsening of ths incineration state of wastes caused by the lowering of the combustor temperature is rectified. Whilst, when tha flow rate of supplemental fuel 15 enhanced, the amount of waste fed to the combustor increases in response to ths increasing flow rate of fuel so that the flow rate of supplemental fuel is prevented from becoming excessive for the conditlon3 and as the result, the supply of supplemental fuel is uniformLy regulated. Increaslng th~ flow rate of supplemental fuel alone will sur~ly contrihute to the complete combu0tlon of waste which has already been char~ed ln the combuator, but involves the anxlety of wasting the supplemental fuel. The method of thi~ lnvention eliminates the above mentloned anxiety in the msmner of increa3ing the amount of waMte ~ed to the combustor as th~ elow rate of supplemental fuel ls increa~ed, and thu~
suppressing a tendency that the flow rate oP supplemental fueL i9 lncreased needlessly. And, rai3ing of the outlet gas temperature of the combustor over the set temperature 3uggest3 that the totsl heating value of wastes fed to the combustor plus supplemental fuel is in surplus. In the ca~e of the method of this invention, when the outlet gas temperature of the combustor is raised over the 3et temperature, first of all the flow rate of supplemental fuel is decreased and the amount of wastes fed to the combustor is also decreased ~n response thereto, whereby the occurrence of abnormally high temperatures and incomplete combustion of waste in the combustor can be evaded.
_ ~ _
IN CONBUSTOR E~'OR RADIOACTIV~ WASTES
BACKGROUND OF THE INVENTION
This invention relates to a method for controlling incinaration in a combustor for low-level radioactive wastes, and in more detaLl relates to a method for economizing the consumption o~ supplemental fuel whlle maintaining the incineration state in the combustor stable, by controlling the amount o~
said supplemental fuel and the amount Ole said radioactive wautea fed to the combustor.
Combustible low-level radloactive wastes exhausted from nuclear energy plants and atomlc enerey laboratories lnclude polyethylene sheets, paper, cloths, tlmber and the like. It i~ known that on dispo~al o~ these wastes1 lt i8 most effective to incinerate the wastes through the aid of a liquid ~uel such a~ kerosene, light oil, LNG, LPG or waste oil, and reduce kheir volume.
For incineration o the radloactive wastes, there i9 Kenerally known a combustor that i9 maintained at a ne~ative static pressure an~ normally comprises three combustion chambers maintained in an excess air envlronment.
The wastes are burned as they pass through the combustion chambers in a cyclonic flow pattern.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. l is a cross-sectional view illustrating one embodiment of the combustor for radioactive wastes wherein incineration 19 controlled by the prior art.
Fig. 2 is a cross-sectional view illustrating one embodiment of the combustor for radioactive wastes wherein incineration is controlled by the method of this invention.
In Fig. l, a ~irst combustion chamber 2 of a combustor l ls ed with primary air, supplemental fuel and radioactive wastes respectively from three inlets 3, 4, 6, and ~urther with secondary ir from an inlet 5, thereby forming a cyclonic low. At this stage, the wastes are ignited and move to a second combustion chamber 7. In said second combustion chamber 7, most combustible PAT 11482-l _ ~, _ '' wastes are completely incinerated, and their ashes fall to the bottom of the combustor. Some wastes, which are more difficult to burn, are incinerated at the bottom of the combustor. A third combustion chamber 8 partitioned from the second combustion chamber 7 by a wall i5 a zone designed to complete the removal of the heavier particles from the flue gas and provide sufelcient residence time for complete combustion.
When incinerating radioactive wastes in the combustor, aY a matter of course, it is preferable to incinerate the wastes completely, possibly by consuming a small amount of supplemental fuel to maintain the incineration state in the combustor stable during the period ~f lncineratlon. Accordlngly, the prior art has employed a method for m~lntninin~ the outl~t gas t~mperature of the combustor at a certaln target value as shown irl ~lg, 1, which comprises the steps of detecting an outlet gas temperature of the combustor by means of a thermometer 9, sending it slgnal to a temperature-indicator controller ~'~'IC) 10, driving, for instance, a diaphragm valve 11 at the outlet of said controller, and decreasing or increasing the amount of supplemental fuel fed to the combustor, wherein 815 + 15C is Generally selected as said target value.
This method for controlling incineration i9 designed to maintain the amount of waste fed to the combustor per unit of time uniform, and increase or reduce the supply of supplemental fuel in correspondence with a rise and fall of the outlet gas temperature of the combustor. This method is effective for the purpose of maintaining the incineration state stable, so far as the heat~ng value of wastes fed to the combustor is unchanged.
However, the radioactive wastes to be incinerated can vary, and also their heating value and bulk density depending upon type. In this connection, it is to be noted that when comparing paper with polyethylene, the former is inferior in heatlng value and bulk density to the latter. Accordingly, the usual incineration control method is disadvantageous in that when waste is fed to the combustor in a uniform amount per unit of time, for instance, said waste consisting malnly of paper, complete inclneration of waste can be achieved even when the supply of supplemental fuel is small, but as the heating value of the waste is small, needless supplemental fuel i9 fed to the com~ustor and consumed. In the case where the waste to be incinerated consists mainly of polyethylene, the usual incineration control method encounters different problems such as fusion of ashes and the like due to the fact that since its - . .
'`'' .
~5~79 heating value and bulk density are consp:lcuo-lsly large a~ compared with papor,the heating value ~enerated in the combustor a1so becomes extremely large, thereby making it difficult to maintain a normal incineration state. In addition, this lncineration control method i9 dlsadvantageous in that slnce every time the content of waste fed to the combustor i9 changed, the heating value thereof is al90 changed, hunting takes place every time that the content of waste fed to the combustor is changed, and so it becomes extremely difficult to msintain a stable state of complete Lncineration.
On the other hand, there has also been used an incineration control method for maintainin~ the outlet gas temperature of the combu~tor unlform which comprises setting the amount of supplemental fuol fed to the combustor, and controllin~ the amount of waste fed to the combustor alone, wherein, however, since the burning rate of waste 19 slower than that of the supplemental Puel, the tlme la~ untll the change in the supply of waste appears in the form o~ a change in the outlet gas temperature of the combustor, ls long. Therefore, this lncineratlon control method i9 liable to cause hunting, and so can never incinerate the wastes stably and completely.
SUMMARY OF THE INVh'NTION
~0 This invention provides a method for controlling incineration in a combustor for radioactive wastes which comprises, on incinaratln~ combustlbls radioactive wastes using a fluid supplemental fuel ln sa~d combustor, detectlng an outlet gas temperature of said combustor by mean3 of a thermometer whareln when said detected temperature is hi~her than a set temperature, the amount of supplemental fuel fed to the combustor is reduced and when the detected temperature is lower than said set temperature, said amount of supplemental fuel fed to the combustor is increased; as well as detecting the flow rate of supplemental fuel fed to the combustor by means of a flow meter: wher0in when said detected flow rate decreases, the amount of radioactiva wasta fed to the combustor is decreased and when the detected flow rate increases, the amount of radioactive waste fed to the combu~tor is increased.
lrh8s~ 9 DETAILED DESCRIPrION OF THE I~VENTIO~
In Fig. 2, a flrst combustion chamber 22 of a combustor ~1 i8 fed w~th primary air, supplemental fuel and radioactlve wastes respectively from thre~
inlets 23, 2b, 26 and further with secondary air from an inlet 25. These are well mixed with said supplemental fuel and radioactive wastes to thereby form a cyclonic flow. At this stage, the waste begins to ignite and Pall to a ~econd combustion chamber 28. In said second combustion chamber, a reverse air flow, opposing the flow of the first combustlon chamber, is produced from an inlet 27. In the second combustion chamber 28, most combustlble wastes are completely lncinerated and some ashes all to the bottom of the combustor.
Some of the waste, which is mora dlfficult to burn, ls lncin~rated at the bottom of tho combustor. A third combusti.on chamber 29 provlded as a "V"
shaped corrldor ad~acent the second combustion chamber 28, i~ a zone designed to completo the removal Oe the heavler particles from the ~lue gas flowed thereinto an,d provlde combustible wastes with sufflclent re~ldence time, Additlonal air is in~ected into the bottom of the combustor from an inlet 30, and the particles having fallen to the bottom can continue to burn, supported by said additional air. As the supplemental fuel alding in the incineration of th0 waste, there are generally used various llquid fuels such as kerosene, light oil, LNG, LPG, waste oil or the like.
The incineration controlling method of this invention is applicable to the above mentioned combustor for radioactive wastes. Simply speaking, the incineration control method of this invention is designed to control the supply of supplemental fuel so that the outlet gas temperature of the combustor may be maintained uniformly, and increase or decrease the amount of waste fed to the combustor in response to an increase or decrease in the supply of supplemental fuel. In other words, the amount of waste fed to the combustor is controlled 50 that the supply nf supplemental fuel may become nearly uniform. It is known from experience that with the conditions that the oxygen concentration in the outlet gas of the combustor is 10~ or more and the outlet gas temperature is maintained to be at lea~t 815 i 15C, combustible wastes fed to the combustor, irrespective of kind, can be completely incinerated. In the incineration controlling method of this invention, accordingly, the outlet gas temperature of the combustor is detected by means of a temperature-indicator element (TE) PAI 11482-l ': ;
'3 and said ~etected temperature i9 sent to a temperature-indicator controller (TIC) as shown in Fig. 2. TLC generaliy output3 Q signal according to proportional ~ integral + derivstive control to drive for inatance a diaphragm valve included in a supplemental fuel supply line. In other words, in the case where the detected tsmperature is lower than the set value of the outlet Bas temperature of the combustor, namely 815 + 15C, the opening of said diaphragm valve i9 enlarged to increase the supply of supplemental fuel fed to the combustor, while in the case whare the detected temperflture is higher, the opening of said valve is reduced to decrease the supply of supplemental fuel.
The procedure of detecting the outlet gas3 temperature of the combustor and increasing or decreasing the supply of supplemental fuel according to the detected temperature for the purpose of maintalning the outlet gas temperature at the predetermlned set temperature, hasl also been employed in the usual incineration controlllng method illustrated in Flg. 1. In this connection, it is to be noted that the incineration controlling method of this ~nvention i8 designed to control the supply of supplemental fuel as well as the amount of radioactive wastes fed to the combustor according to the flow rate of the supplemental fuel. As shown in Pig. 2, a flow meter ~PE) disposed in the supplemental fuel supply line detects the flow rate of supplemental fuel and sends it to a flow-indicator controller (FIC). In the case where the detected flow rate sent from FE increases, FIC outputs a signal respondlng to its increase. Said signal is sent to a speed controller ~SC) for heightening the rotating speed (N) of a motor for driving a screw feeder of wQste to increase the amount of waste fed to the combustor, thereby controlling the increase in the flow rate of supplemental fuel. In the case where the detected slgnal ~ent from FE decreases, contrarily, FIC lowers the rotating spee~ tN) of the motor M, for driving the screw feeder of waste according to the decrease in said signal, thereby decreasing the amount of waste fed to the combustor. It iæ
also possible to adjust the amount of waste fed to the combustor according to the same procedure aR mentioned above except that the signal from SC is sent to a motor U2 for drlving a rotary valve disposed downstream of the screw feeder in the place of the motor Ml.
Lowering of the outlet gas temperature of the combustor below the set temperature suggests that the total heating value of waste fed to the combustor plus supplemental fuel is small. In the method of this invention, when the _ 5 _ ~ ~85~3 outlet gas temperature of the combustor 19 lower than the set temperature, first of all the flow rate of the supplementQl fuel, which has a high burning rate, to the combustor is enhanced and thus the outlet gas temperature of the combustor is ralsed up to the set temperature, whereby worsening of ths incineration state of wastes caused by the lowering of the combustor temperature is rectified. Whilst, when tha flow rate of supplemental fuel 15 enhanced, the amount of waste fed to the combustor increases in response to ths increasing flow rate of fuel so that the flow rate of supplemental fuel is prevented from becoming excessive for the conditlon3 and as the result, the supply of supplemental fuel is uniformLy regulated. Increaslng th~ flow rate of supplemental fuel alone will sur~ly contrihute to the complete combu0tlon of waste which has already been char~ed ln the combuator, but involves the anxlety of wasting the supplemental fuel. The method of thi~ lnvention eliminates the above mentloned anxiety in the msmner of increa3ing the amount of waMte ~ed to the combustor as th~ elow rate of supplemental fuel ls increa~ed, and thu~
suppressing a tendency that the flow rate oP supplemental fueL i9 lncreased needlessly. And, rai3ing of the outlet gas temperature of the combustor over the set temperature 3uggest3 that the totsl heating value of wastes fed to the combustor plus supplemental fuel is in surplus. In the ca~e of the method of this invention, when the outlet gas temperature of the combustor is raised over the 3et temperature, first of all the flow rate of supplemental fuel is decreased and the amount of wastes fed to the combustor is also decreased ~n response thereto, whereby the occurrence of abnormally high temperatures and incomplete combustion of waste in the combustor can be evaded.
_ ~ _
Claims (3)
1. A method for efficiently controlling incineration in a combustor for radioactive waste which comprises, incinerating combustible radioactive waste together with supplemental fuel in said combustor, detecting an outlet gas temperature of the combustor so that when said detected temperature is higher than a predetermined temperature, the flow rate of supplemental fuel fed to the combustor is reduced, and when the detected temperature is lower them said set temperature, the flow rate of supplemental fuel fed to the combustor is increased; and detecting the flow rate of supplemental fuel fed to the combustor by means of a flow meter, so that when said detected flow rate decreases, the amount of radioactive waste fed to the combustor is decreased and when the detected flow rate increases, the amount of radioactive waste fed to the combustor increases.
2. The method as claimed in claim 1, wherein the predetermined temperature of the outlet gas from the combustor is 815 ? 15°C.
3. The method as claimed in claims 1 or 2, wherein the supplemental fuel is kerosene, light oil, LNG, LPC or waste oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000548820A CA1285179C (en) | 1987-10-07 | 1987-10-07 | Method for controlling incineration in combustor for radioactive wastes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000548820A CA1285179C (en) | 1987-10-07 | 1987-10-07 | Method for controlling incineration in combustor for radioactive wastes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1285179C true CA1285179C (en) | 1991-06-25 |
Family
ID=4136602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000548820A Expired - Fee Related CA1285179C (en) | 1987-10-07 | 1987-10-07 | Method for controlling incineration in combustor for radioactive wastes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1285179C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224435A (en) * | 2018-01-31 | 2018-06-29 | 青岛天和清原科技有限公司 | A kind of middle low-level waste heat chemistry integrated treatment unit |
-
1987
- 1987-10-07 CA CA000548820A patent/CA1285179C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224435A (en) * | 2018-01-31 | 2018-06-29 | 青岛天和清原科技有限公司 | A kind of middle low-level waste heat chemistry integrated treatment unit |
| CN108224435B (en) * | 2018-01-31 | 2023-09-08 | 青岛天和清原科技有限公司 | Middle-low level waste thermochemical integrated treatment device |
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