JP2005257234A - Slag tapping temperature control method, slag tapping temperature control program and slag tapping temperature control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slag tapping temperature control method, a slag tapping temperature control program and a slag tapping temperature control device capable of rapidly and sufficiently responding to fluctuation of slag tapping temperature involved by property change of waste or the like. <P>SOLUTION: This method comprises a measuring step of measuring the temperature of a discharged melt; and a control step of controlling the temperature of the melt by combining a plurality of steps among step of adjusting the temperature of oxygen-containing gas to be blown to a tuyere, a step of adjusting the oxygen concentration of the oxygen-containing gas to be blown to the tuyere, and a step of adjusting the input quantity of carbonaceous auxiliary fuel to be inputted through a charging hole at an upper part of a fuel body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a melting treatment of waste using coke as a solid carbon-based fuel, and more specifically, to maintain a stable operation with a constant temperature of molten waste (an output temperature). The present invention relates to a temperature control technology for a waste melting furnace.

The following technique is known as a method of adjusting the furnace temperature of a conventional waste melting furnace using a solid carbon-based fuel. For example, in the method disclosed in Patent Document 1, the furnace temperature is adjusted by increasing or decreasing the amount of carbon-based fuel used. In addition, for example, in the method disclosed in Patent Document 2, the furnace temperature is adjusted by raising or lowering the temperature of the oxygen-containing gas blown into the high-temperature combustion zone at the bottom of the furnace in order to cope with an instantaneous change in the furnace temperature. It was.
Japanese Patent Laid-Open No. 9-60830 JP 2003-74823 A

  However, in the method described in Patent Document 1, since the carbon-based fuel is charged from the top of the furnace, it is necessary to wait until the carbon-based fuel reaches the tuyere to exert an effect on the tapping temperature. Therefore, there was a time loss until it descended to the tuyere, causing problems such as a rapid decrease in the furnace temperature due to changes in the properties of the waste, etc., and a sudden increase in the furnace temperature. .

  Further, in the method described in Patent Document 2, the effect on the furnace temperature appears in a short time, but generally there is a problem that a sufficient amount of operation cannot be provided because the correction range of the blowing temperature is limited. It was.

  The present invention has been made in order to solve the above-mentioned problems, and is a waste melting furnace capable of quickly and sufficiently responding to fluctuations in the temperature of the tapping due to changes in the properties of the waste. It is an object to provide an output temperature control method, an output temperature control program, and an output temperature control device.

  In order to solve the above problems, the temperature control method according to claim 1 according to the present invention is such that waste and carbon-based auxiliary fuel are introduced into the furnace body from the furnace inlet, and high-temperature combustion is performed in the lower part of the furnace. A band is formed and a waste layer is formed on the high-temperature combustion zone, and has tuyere that blows an oxygen-containing gas into the high-temperature combustion zone. The waste is pyrolyzed to melt the pyrolysis residue. , A waste temperature control method for a waste melting furnace for discharging the melt from the outlet, a measuring step for measuring the temperature of the discharged melt, and a temperature based on the measured temperature of the melt Adjusting the temperature of the oxygen-containing gas blown to the tuyere, adjusting the oxygen concentration of the oxygen-containing gas blown to the tuyere, and the carbon-based auxiliary fuel introduced from the charging port at the top of the furnace body Multiple steps of adjusting the input amount And a control step of controlling the temperature of the melt in combination.

  Further, the output temperature control method according to claim 2 of the present invention is the output temperature control method according to the above-described invention, wherein the control step is such that the measured temperature of the melt is out of a predetermined range. If the temperature of the oxygen-containing gas blown to the tuyere is adjusted, the temperature of the oxygen-containing gas blown to the tuyere is further adjusted. The oxygen concentration is adjusted, and when the temperature of the melt is out of a predetermined range after a predetermined time has elapsed, the amount of carbon-based auxiliary fuel introduced from the charging inlet is further adjusted.

  According to a third aspect of the present invention, there is provided an output temperature control method according to the present invention, wherein the measured temperature of the melt is out of a predetermined range. If the temperature of the oxygen-containing gas blown to the tuyere cannot be manipulated, the oxygen concentration of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is set to a predetermined value after a predetermined time has elapsed. If it is out of the range, the amount of carbon-based supplementary fuel introduced from the charging port is further adjusted.

  According to a fourth aspect of the present invention, there is provided an output temperature control method according to the present invention, wherein the measured temperature of the melt is out of a predetermined range. If the operation of the temperature of the oxygen-containing gas blown to the tuyere and the operation of the oxygen concentration of the oxygen-containing gas blown to the tuyere cannot be performed, the amount of carbon-based auxiliary fuel introduced from the charging port Adjust.

  The output temperature control method according to claim 5 of the present invention is the output temperature control method according to the above-described invention, wherein the control step includes a step in which the measured temperature of the melt is out of a predetermined range. The temperature of the oxygen-containing gas blown to the tuyere is adjusted, and when the temperature of the melt is within a predetermined range after a predetermined time has elapsed, the temperature of the melt is adjusted within the predetermined range Therefore, the amount of heat necessary for this is supplemented by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen-containing gas temperature is returned to the initial state.

  According to a sixth aspect of the present invention, there is provided an output temperature control method according to the present invention, wherein the measured temperature of the melt is out of a predetermined range. If there is, adjust the oxygen concentration of the oxygen-containing gas blown to the tuyere, and if the temperature of the melt is within a predetermined range after a certain time has elapsed, adjust the temperature of the melt to be within the predetermined range The amount of heat necessary for this is compensated by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen concentration of the oxygen-containing gas is returned to the initial state.

  According to a seventh aspect of the present invention, there is provided a temperature control program according to the present invention, in which waste and carbon-based auxiliary fuel are introduced into the furnace body from the furnace inlet, and a high-temperature combustion zone is formed at the lower part of the furnace. A waste layer is formed on the combustion zone, and has tuyere that blows oxygen-containing gas into the high-temperature combustion zone. The waste is pyrolyzed to melt the pyrolysis residue, and the melt is discharged. A program for controlling a discharge temperature of a waste melting furnace to be discharged from a mouth, the measuring step for measuring the temperature of the discharged melt, and the tuyere based on the measured temperature of the melt Adjusting the temperature of the oxygen-containing gas blown to the furnace, adjusting the oxygen concentration of the oxygen-containing gas blown to the tuyere, and adjusting the amount of carbon-based auxiliary fuel introduced from the charging port at the top of the furnace body Combine multiple steps within a step It was said to execute a control step of controlling the temperature of the melt to the computer.

  In addition, the output temperature control program according to claim 8 of the present invention is the output temperature control program according to the above-described invention, wherein the measured temperature of the melt is outside a predetermined range. If the temperature of the oxygen-containing gas blown to the tuyere is adjusted, the temperature of the oxygen-containing gas blown to the tuyere is further adjusted. The oxygen concentration is adjusted, and when the temperature of the melt is out of a predetermined range after a predetermined time has elapsed, the amount of carbon-based auxiliary fuel introduced from the charging inlet is further adjusted.

  Further, the output temperature control program according to claim 9 of the present invention is the output temperature control program according to the above-described invention, wherein the control step includes that the measured temperature of the melt is out of a predetermined range. If the temperature of the oxygen-containing gas blown to the tuyere cannot be manipulated, the oxygen concentration of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is set to a predetermined value after a predetermined time has elapsed. If it is out of the range, the amount of carbon-based supplementary fuel introduced from the charging port is further adjusted.

  Further, the output temperature control program according to claim 10 of the present invention is the output temperature control program according to the above-described invention, wherein the control step is such that the measured temperature of the melt is out of a predetermined range. If the operation of the temperature of the oxygen-containing gas blown to the tuyere and the operation of the oxygen concentration of the oxygen-containing gas blown to the tuyere cannot be performed, the amount of carbon-based auxiliary fuel introduced from the charging port Adjust.

  Further, the output temperature control program according to claim 11 of the present invention is the output temperature control program according to the above-described invention, wherein the measured temperature of the melt is out of a predetermined range. The temperature of the oxygen-containing gas blown to the tuyere is adjusted, and when the temperature of the melt is within a predetermined range after a predetermined time has elapsed, the temperature of the melt is adjusted within the predetermined range Therefore, the amount of heat necessary for this is supplemented by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen-containing gas temperature is returned to the initial state.

  Further, the output temperature control program according to claim 12 of the present invention is the output temperature control program according to the above-described invention, wherein the control step is performed such that the measured temperature of the melt is out of a predetermined range. If there is, adjust the oxygen concentration of the oxygen-containing gas blown to the tuyere, and if the temperature of the melt is within a predetermined range after a certain time has elapsed, adjust the temperature of the melt to be within the predetermined range The amount of heat necessary for this is compensated by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen concentration of the oxygen-containing gas is returned to the initial state.

  According to a thirteenth aspect of the present invention, there is provided a tapping temperature control apparatus in which waste and carbon-based auxiliary fuel are introduced into the furnace body from the furnace inlet, and a high-temperature combustion zone is formed in the lower part of the furnace. A waste layer is formed on the combustion zone, and has tuyere that blows oxygen-containing gas into the high-temperature combustion zone. The waste is pyrolyzed to melt the pyrolysis residue, and the melt is discharged. A waste temperature control device for a waste melting furnace to be discharged from a mouth, measuring means for measuring the temperature of the discharged melt, and blowing air to the tuyere based on the measured temperature of the melt Means for adjusting the temperature of the oxygen-containing gas, means for adjusting the oxygen concentration of the oxygen-containing gas blown to the tuyere, means for adjusting the amount of carbon-based auxiliary fuel input from the charging port at the top of the furnace body The temperature of the melt is controlled by executing a plurality of means in combination. And control means for.

  According to a fourteenth aspect of the present invention, there is provided an output temperature control device according to the present invention, wherein the control means is configured such that the measured temperature of the melt is out of a predetermined range. If the temperature of the oxygen-containing gas blown to the tuyere is adjusted, the temperature of the oxygen-containing gas blown to the tuyere is further adjusted. The oxygen concentration is adjusted, and when the temperature of the melt is out of a predetermined range after a predetermined time has elapsed, the amount of carbon-based auxiliary fuel introduced from the charging inlet is further adjusted.

  According to a fifteenth aspect of the present invention, there is provided an output temperature control device according to the present invention, wherein the control means is configured such that the measured temperature of the melt is out of a predetermined range. The temperature of the oxygen-containing gas blown to the tuyere is adjusted, and when the temperature of the melt is within a predetermined range after a predetermined time has elapsed, the temperature of the melt is adjusted within the predetermined range Therefore, the amount of heat necessary for this is supplemented by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen-containing gas temperature is returned to the initial state.

  ADVANTAGE OF THE INVENTION According to this invention, it can respond rapidly and fully with respect to the fluctuation | variation of the tapping temperature accompanying the property change etc. of a waste.

[First Embodiment]
FIG. 1 is a longitudinal cross-sectional view showing a waste melting furnace to which a method for controlling a tap temperature according to a first embodiment of the present invention is applied.

  A furnace body 1 of a shaft-type waste melting furnace is constituted by a cylindrical free board portion 1a located at an upper portion thereof, a morning glory portion 1b whose diameter is expanded upward, and a furnace lower portion 1c. . The waste melting furnace is filled with a deposition layer 2 formed of carbon-based auxiliary fuel such as waste and coke. The deposited layer 2 constitutes a waste layer 3, a high-temperature combustion zone 4, and a melt 5 from the top to the bottom.

  At the top of the furnace body 1, an inlet 6 for waste and coke is provided, and at the side of the furnace body 1, tuyere 7 for blowing oxygen-containing gas is provided. A plurality of tuyere 7 are provided as a set on a three-level circumference along the height direction of the furnace body 1. The set of tuyere is an upper three-stage tuyere 8 provided at a level corresponding to a level above the upper surface of the waste layer 3 (a space above the upper surface of the waste layer 3). One set of tuyere is a middle sub tuyere 9 provided at a level corresponding to the upper part of the waste layer 3. Further, another set of tuyere is provided at a level corresponding to the high temperature combustion zone 4 formed under the waste layer 3, and the lower main tuyere 10 that blows oxygen-containing gas into the high temperature combustion zone 4. is there.

  On the side wall in the vicinity of the bottom of the furnace body 1, an outlet 11 is provided for discharging the melt 5 accumulated in the furnace bottom from the furnace. A combustion exhaust gas discharge port 12 is provided on the upper side wall of the furnace body 1. The exhaust port 12 may be provided with a heat exchanger (not shown) that heats the air using the heat of the combustion exhaust gas. The hot air generating furnace 13 generates heated blown oxygen-containing gas blown into the main tuyere 10. A blower 14 is connected to one end of the hot air generating furnace 13, and the other end is connected to the lower main tuyere 10. A kerosene burner may be used as the heat source of the hot air generating furnace 13, or heated air exchanged with the exhaust gas from the waste melting furnace may be used. Further, a boiler using sensible heat of exhaust gas may be used.

  Oxygen generated by the oxygen generator 15 is mixed with hot air generated in the hot air generator 13 by the oxygen flow controller 16, and oxygen-enriched air having a predetermined oxygen concentration is blown from the main tuyere 10. The charging device 17 charges waste, coke, limestone and the like from the charging port 6 at the top of the furnace. Charges are weighed by a waste weighing device 18, a coke weighing device 19 and a limestone weighing device 20, respectively, and are managed at a predetermined mixing ratio.

  The thermometer 22 is disposed in the vicinity of the tap hole 11 and measures the temperature of the melt 5 discharged from the tap hole 11. The thermometer 22 may be a contact-type thermometer that contacts the melt 5 with a thermocouple, an optical cable, or the like, or a non-contact-type thermometer such as a thermoviewer that measures radiant heat or a radiation thermometer. Also good. The furnace bottom thermometer 23 is installed at the furnace bottom of the waste melting furnace and measures the temperature of the furnace bottom refractory brick. The furnace bottom thermometer 23 can estimate the state of the furnace heat. The furnace bottom thermometer 23 uses a contact-type thermometer that makes a thermocouple, an optical cable, or the like contact the refractory brick.

  Various process signals of the waste melting furnace such as a charging amount, a blowing temperature, and a tapping temperature are input to the tapping temperature control device 21 (not shown). The tapping temperature control device 21 detects the temperature of the melt 5 discharged from the tapping port 11, and the hot air generator 13, the oxygen flow rate regulator 16, the waste metering device 18, the coke metering device 19, and the limestone metering device 20. Etc. to control the output temperature.

  Next, the output temperature control method according to the first embodiment of the present invention will be described.

  When the waste is gasified and melted in the waste melting furnace, first, waste and coke, which is one of carbon-based auxiliary fuels, and limestone as a slag adjusting agent are charged from the charging port 6. The deposited layer 2 is formed by the charge. The charge forming the deposited layer 2 is combusted together with the combustible gas generated in the lower part while being appropriately flowed by the air blown from the middle sub tuyere 9. With this combustion heat, the waste is heated and dry-distilled to generate combustible gas.

  The carbonized waste is sequentially lowered from the upper part of the deposition layer 2 to the furnace lower part 1c, burned by the oxygen-containing gas blown from the lower main tuyere 10 and incinerated, then melted and melted. 5 and discharged from the spout 11. On the other hand, a part of the generated combustible gas is combusted by the oxygen-containing gas blown from the upper three-stage tuyere 8 in the free board portion 1 a and is discharged from the exhaust port 12.

  By the way, since the waste water, the calorific value, and the ratio of combustible material and non-combustible material are not constant, the temperature in the furnace always varies. That is, when a large amount of waste with a large amount of adhering moisture and a small calorific value is introduced, the temperature in the furnace is lowered, the viscosity of the melt 5 is increased, the fluidity is lowered, and the discharge is delayed. There is a risk that some will not melt and be discharged out of the furnace, or solidified in the furnace, making it impossible to discharge. Conversely, when waste with a high combustible ratio and low moisture content is used, the temperature in the furnace suddenly rises, increasing the wear of the furnace wall refractory, and part of the melt 5 is hot. Vaporizes and condenses in the furnace to form deposits, making it impossible to operate.

  In order to prevent such instability of operation due to fluctuations in the furnace temperature, in the tapping temperature control method according to the present embodiment, the tapping temperature control device 21 firstly melts as discharged as the first action. The measurement temperature of the thing 5 is taken in, and the ventilation temperature of the oxygen enriched air supplied to the main tuyere 10 is adjusted according to the temperature. By adjusting this blowing temperature, the temperature in the furnace can be controlled to be constant, and the temperature of the discharged melt 5 can be kept constant.

  A preferable range of the temperature of the melt 5 is 1500 ° C. or higher and 1600 ° C. or lower. The melting point of waste combustion residue and incombustible material is estimated to be 1300 ° C or higher, but it is difficult to flow in a smooth state at about 1300 ° C. A range is considered preferred. Therefore, the temperature of the melt 5 discharged from the tap outlet 11 is continuously measured by the thermometer 22, and when the temperature falls from a predetermined management value, the tap temperature control device 21 detects this, The hot air generation furnace 13 is controlled to increase the blowing temperature of the oxygen-enriched air supplied from the main tuyere. Thereby, the temperature of the high temperature combustion zone 4 around the main tuyere 10 can be raised, and the dripping melt 5 can be heated to raise the temperature.

  On the other hand, when the temperature of the melt 5 is 1600 ° C. or higher, there arises a problem that wear of the refractory on the furnace wall increases. Therefore, when the temperature of the melt 5 becomes higher than a predetermined control value, the tapping temperature control device 21 detects this, controls the hot air generating furnace 13, and controls the oxygen-enriched air supplied from the tuyere. The temperature of the melt 5 is lowered by lowering the blowing temperature.

  In addition, if the heat exchange of the oxygen-enriched air blown using combustion exhaust gas is performed, a blowing temperature of 100 ° C. to 250 ° C. can be obtained from the hot air generating furnace 13. For example, when the temperature in the furnace is lowered and the temperature in the furnace is lowered, that is, when the temperature of the melt 5 detected by the thermometer 22 is lower than the control value, the blowing temperature is set to the highest temperature by 20 ° C., for example. Raise to 250 ° C. On the other hand, when the detected temperature of the melt 5 becomes higher than the control value, the blowing temperature is lowered by, for example, 20 ° C. to the lowest blowing temperature 100 ° C., for example. In this way, by controlling the blowing temperature, the furnace temperature can be quickly adjusted with respect to the property of the waste that changes from moment to moment, and stable operation can be maintained.

  By the way, the range that can be operated in the hot air generating furnace 13 is at most 100 ° C. to 250 ° C., and this amount of operation alone may not be able to be sufficiently controlled. In this case, as the second action, the oxygen concentration of the oxygen-enriched air blown from the main tuyere 10 is operated by the oxygen flow rate regulator 16.

  At this time, the total amount of oxygen blown into the waste incinerator, that is, the amount of acid sent is controlled to be constant. By controlling the oxygen concentration of the oxygen-enriched air that is blown, the adiabatic flame temperature of the main tuyere, that is, the temperature of the combustion gas, is manipulated, but the total treatment time of waste is not changed by keeping the amount of acid sent constant. It is to do. If the temperature of the combustion gas at the tip of the main tuyere changes, the heat exchange state of the high-temperature gas and waste in the deposition layer 2 changes, so that the temperature of the melt 5 can be adjusted. For example, in a steady state, the air is blown at an oxygen concentration of 35%. When the temperature in the furnace is lowered, that is, when the temperature detected for the melt 5 by the thermometer 22 is lower than the control value, the oxygen concentration is increased by 0.5% to a maximum concentration of 38%, for example. On the contrary, when it becomes higher than the control value, the oxygen concentration is lowered to, for example, a minimum blowing temperature of 35% by 0.5%. In this way, by operating in combination with the blast temperature and the oxygen concentration, the furnace temperature can be quickly adjusted with respect to the waste properties that change from moment to moment, and the operation can be maintained stably. .

  However, when the operation amount of oxygen concentration is further insufficient, the ratio of waste and coke charged from the charging port 6 is operated as a third action. That is, the temperature of the melt 5 is adjusted by increasing / decreasing the amount of coke as auxiliary fuel with respect to the amount of waste to be treated.

  For example, during normal operation, 80 kg of coke is charged per 1T (ton) of garbage. When the temperature in the furnace is decreased, that is, when the temperature detected by the thermometer 22 is lower than the control value, the coke is increased by, for example, 1 kg per 1 T (ton) of garbage. On the contrary, when it becomes higher than the control value, the coke is reduced by 1 kg per 1T (ton) of garbage, for example.

  As described in Patent Document 1, in order for this coke amount changing operation to be effective, it is necessary to wait until the coke reaches the tuyere. However, in general, the amount of coke is the most flexible from the viewpoint of the operation width, that is, the effect on the furnace temperature, so the effect as an auxiliary when the operation amount is insufficient only by the temperature and oxygen concentration of the oxygen-enriched air is tremendous. It is.

  FIG. 2 is a flowchart showing a schematic procedure of the tapping temperature control method according to the first embodiment of the present invention. This processing flow shows the contents processed by the tapping temperature control device 21.

  In step S01 to S02, the tapping temperature controller 21 reads the process signal of the waste melting furnace and evaluates the state in the furnace. In the present embodiment, the evaluation is made based on the tapping temperature, but the evaluation may be made based on the furnace bottom temperature. Moreover, you may evaluate combining a tapping temperature and a furnace bottom temperature.

  In steps S03 to S04, if the output temperature is lower than the predetermined management temperature, it is checked whether or not the blowing temperature can be increased. For example, when the operation of the blowing temperature is prohibited for some reason, or when the blowing temperature is at an upper limit that can be changed, the changing operation cannot be performed.

  When raising operation of blowing temperature is possible (Step S04 Yes), blowing temperature is raised in steps in Steps S05-S06. For example, the temperature is increased by 20 ° C. every predetermined time. Then, after the predetermined time t1 has passed, it is checked whether the output temperature has recovered within the control temperature range. The predetermined time t1 is a value set in advance as a time required for the result of operating the air blowing temperature to be reflected in the output temperature.

  When the tapping temperature recovers after the elapse of the predetermined time t1 (step S06 Yes), the coke metering device 19 is controlled to increase the amount of coke corresponding to the increased blowing temperature in step S07. Furthermore, in order to burn the increased coke, the amount of oxygen corresponding to the increase in coke is increased.

  In step S07, the amount of coke and the amount of oxygen are increased in order to return the blowing temperature to the initial state so that it can be operated when the output temperature is lowered next time. Accordingly, in step S08, when it is determined that the output temperature has increased due to the increase in the amount of coke after a predetermined time t4, the blowing temperature is returned to the initial state.

  When the blowing temperature is not operable (No at Step S04) or when the extraction temperature does not recover even after the predetermined time t1 has elapsed (No at Step S06), the output temperature is controlled by changing the oxygen concentration.

  In step S11, it is examined whether or not the oxygen concentration can be increased. For example, when the operation of the oxygen concentration is prohibited for some reason, when the oxygen concentration is at a changeable upper limit value, or when the amount of oxygen generation is at the upper limit value, the change operation cannot be performed.

  When the oxygen concentration can be increased (step S11 Yes), the oxygen concentration is increased stepwise in steps S12 to S13. For example, it is increased by 1% every predetermined time. Then, after the predetermined time t2 has elapsed, it is checked whether the output temperature has recovered within the control temperature range. The predetermined time t2 is a value set in advance as a time required for the result of operating the oxygen concentration to be reflected in the output temperature.

  If the tapping temperature recovers after the elapse of the predetermined time t2 (Yes in step S13), the amount of coke corresponding to the increased oxygen concentration in step S14 (the increased blowing temperature when the blowing temperature is increased) The coke metering device 19 is controlled so as to increase the amount of coke corresponding to. Then, in order to burn the increased coke, the amount of oxygen corresponding to the increased amount of coke is increased.

  In step S14, the amount of coke and the amount of oxygen are increased so that the blower temperature is returned to the initial state, and the operation can be performed when the output temperature is lowered. Therefore, in steps S15 to S16, when it is determined that the tapping temperature has increased due to the increase in the amount of coke after a predetermined time t5, the oxygen concentration is returned to the initial state, and when the blowing temperature is further increased, the predetermined time When it is determined that the tapping temperature has increased due to the increase in the amount of coke after t4, the air blowing temperature is returned to the initial state.

  When the blast temperature is not operable (No at Step S04), or when the tapping temperature does not recover even after the predetermined time t1 has elapsed (No at Step S06), and the oxygen concentration is not operable (No at Step S11). Alternatively, if the tapping temperature does not recover even after the predetermined time t2 has elapsed (No in step S13), the tapping temperature is controlled by changing the coke amount.

  In step S21, the amount of coke required to increase the tapping temperature (when increasing the blowing temperature, the amount of coke corresponding to the increased blowing temperature is added to further increase the oxygen concentration. The coke metering device 19 is controlled so as to increase the amount of coke corresponding to the increased oxygen concentration. Then, in order to burn the increased coke, the amount of oxygen corresponding to the increased amount of coke is increased.

  In step S22, it is checked whether the output temperature has recovered within the control temperature range after a predetermined time t3. The predetermined time t3 is a value set in advance as a time required for the result of manipulating the coke amount to be reflected in the cooking temperature.

  In step S22, the amount of coke and the amount of oxygen are increased so that the blowing temperature is returned to the initial state, and the operation can be performed when the output temperature is lowered. Accordingly, in steps S23 to S24, when it is determined that the tapping temperature has increased due to the increase in the amount of coke after a predetermined time t5, the oxygen concentration is returned to the initial state, and when the blowing temperature is further increased, the predetermined time When it is determined that the tapping temperature has increased due to the increase in the amount of coke after t4, the air blowing temperature is returned to the initial state.

  The first to third actions shown in FIG. 2 are not limited to the order described above, and can be combined in an appropriate order. That is, in order to avoid a rapid fluctuation in the furnace temperature, the action of the oxygen concentration may be executed first, and then the action of the blowing temperature may be executed.

  Although FIG. 2 shows an algorithm in the case where the output temperature falls, control is also performed using an algorithm combining the first to third actions based on the same technical idea when the output temperature rises. can do.

[Effect of the embodiment]
In the method for controlling a waste melting furnace according to the present invention, a high-temperature combustion zone is formed at the bottom of the furnace, a waste layer is formed on the high-temperature combustion zone, and a tuyere that blows oxygen-containing gas into the high-temperature combustion zone is provided. In a waste melting furnace where the ash and incombustible components in the waste are melted by pyrolyzing the waste and the melt is discharged from the outlet, the temperature of the discharged melt is measured and measured. Based on the temperature of the melt, the temperature of the oxygen-containing gas blown to the tuyere is adjusted as the first action, and when that is insufficient, the oxygen of the oxygen-containing gas blown to the tuyere as the second action When the concentration is adjusted and this is still insufficient, the third action is to adjust the amount of carbon-based auxiliary fuel that is introduced from the top of the furnace body, so that the temperature of the melt can be adjusted quickly and sufficiently. Can be kept constant at It is possible to stabilize the operation of Toruro, also can improve the life of the refractory can be suppressed rapid increase in furnace temperature. Furthermore, since waste is not restricted by moisture, heat generation, or the like, various waste can be charged.

  In addition, even if the first action and the second action can be quickly and sufficiently dealt with and the furnace condition is stabilized, after the stabilization, the third action can be replaced with the equivalent of the third action slowly. When the temperature drops, it is possible to secure a control allowance for the first and second actions for taking a quick action, so that the melt temperature can be kept stable.

  Each function described in the above embodiment may be configured using hardware, or may be realized by reading a program describing each function into a computer using software. Each function may be configured by appropriately selecting either software or hardware.

  Furthermore, each function can be realized by causing a computer to read a program stored in a recording medium (not shown). Here, as long as the recording medium in the present embodiment can record a program and can be read by a computer, the recording format may be any form.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows the waste melting furnace to which the tapping temperature control method which concerns on the 1st Embodiment of this invention is applied. The flowchart which shows the procedure of the outline of the tapping temperature control method of the 1st Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Furnace body, 2 ... Deposited layer, 5 ... Melt, 6 ... Inlet, 7 ... tuyere, 11 ... Outlet, 13 ... Hot-air generating furnace, 14 ... Blower, 15 ... Oxygen generator, 16 ... Oxygen Flow regulator, 17 ... charging device, 18 ... waste metering device, 19 ... coke metering device, 20 ... limestone metering device.

Claims (15)

Waste and carbon-based supplementary fuel are introduced into the furnace body from the furnace inlet, a high temperature combustion zone is formed at the bottom of the furnace, a waste layer is formed on the high temperature combustion zone, and oxygen is added to the high temperature combustion zone. A waste melting furnace control method for a waste melting furnace having a tuyere for injecting a contained gas, thermally decomposing the waste, melting the pyrolysis residue, and discharging the melt from the outlet;
A measuring step for measuring the temperature of the melt discharged;
Adjusting the temperature of the oxygen-containing gas blown to the tuyere based on the measured temperature of the melt, adjusting the oxygen concentration of the oxygen-containing gas blown to the tuyere, And a control step for controlling the temperature of the melt by combining a plurality of steps of adjusting the amount of carbon-based auxiliary fuel input from the charging port.滓 Temperature control method. The control step includes
When the measured temperature of the melt is out of the predetermined range, the temperature of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is out of the predetermined range after a predetermined time has elapsed. In the case, the oxygen concentration of the oxygen-containing gas blown to the tuyere is further adjusted, and when the temperature of the melt is out of a predetermined range after a predetermined time has passed, the carbon-based auxiliary introduced from the charging port The method for controlling the temperature of the waste melting furnace according to claim 1, wherein the amount of fuel is adjusted. The control step includes
When the measured temperature of the melt is out of the predetermined range and the operation of the temperature of the oxygen-containing gas blown to the tuyere cannot be performed, the oxygen concentration of the oxygen-containing gas blown to the tuyere is adjusted. 2. The disposal according to claim 1, wherein when the temperature of the melt is out of a predetermined range after a predetermined time has elapsed, the amount of carbon-based supplementary fuel introduced from the charging port is further adjusted. A method for controlling the temperature of the melting furnace. The control step includes
When the measured temperature of the melt is out of a predetermined range, the operation of the temperature of the oxygen-containing gas blown to the tuyere and the operation of the oxygen concentration of the oxygen-containing gas blown to the tuyere cannot be performed The method for controlling the discharge temperature of the waste melting furnace according to claim 1, wherein the amount of carbon-based auxiliary fuel introduced from the charging inlet is adjusted. The control step includes
When the measured temperature of the melt is out of the predetermined range, the temperature of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is within the predetermined range after a predetermined time has elapsed In addition, the amount of heat necessary for adjusting the temperature of the melt within a predetermined range is compensated by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen-containing gas temperature is returned to the initial state. The method for controlling the discharge temperature of the waste melting furnace according to claim 1. The control step includes
When the measured temperature of the melt is out of the predetermined range, the oxygen concentration of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is within the predetermined range after a predetermined time has elapsed. In this case, the amount of heat necessary for adjusting the temperature of the melt within a predetermined range is compensated by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen concentration of the oxygen-containing gas is returned to the initial state. The method for controlling the temperature of the waste melting furnace according to claim 1. Waste and carbon-based supplementary fuel are introduced into the furnace body from the furnace inlet, a high temperature combustion zone is formed at the bottom of the furnace, a waste layer is formed on the high temperature combustion zone, and oxygen is added to the high temperature combustion zone. A program for controlling the discharge temperature of a waste melting furnace that has a tuyere for blowing the contained gas, pyrolyzes the waste, melts the pyrolysis residue, and discharges the melt from the outlet. And
A measuring step for measuring the temperature of the melt discharged;
Adjusting the temperature of the oxygen-containing gas blown to the tuyere based on the measured temperature of the melt, adjusting the oxygen concentration of the oxygen-containing gas blown to the tuyere, A program for causing a computer to execute a control step of controlling the temperature of the melt by combining a plurality of steps of adjusting the input amount of carbon-based auxiliary fuel input from the charging port. The control step includes
When the measured temperature of the melt is out of the predetermined range, the temperature of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is out of the predetermined range after a predetermined time has elapsed. In the case, the oxygen concentration of the oxygen-containing gas blown to the tuyere is further adjusted, and when the temperature of the melt is out of a predetermined range after a predetermined time has passed, the carbon-based auxiliary introduced from the charging port The program according to claim 7, wherein the amount of fuel is adjusted. The control step includes
When the measured temperature of the melt is out of the predetermined range and the operation of the temperature of the oxygen-containing gas blown to the tuyere cannot be performed, the oxygen concentration of the oxygen-containing gas blown to the tuyere is adjusted. The program according to claim 7, wherein when the temperature of the melt is out of a predetermined range after a lapse of a predetermined time, the amount of carbon-based auxiliary fuel introduced from the charging port is further adjusted. . The control step includes
When the measured temperature of the melt is out of a predetermined range, the operation of the temperature of the oxygen-containing gas blown to the tuyere and the operation of the oxygen concentration of the oxygen-containing gas blown to the tuyere cannot be performed The program according to claim 7, wherein the amount of carbon-based auxiliary fuel introduced from the charging port is adjusted. The control step includes
When the measured temperature of the melt is out of the predetermined range, the temperature of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is within the predetermined range after a predetermined time has elapsed In addition, the amount of heat necessary for adjusting the temperature of the melt within a predetermined range is compensated by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen-containing gas temperature is returned to the initial state. The program according to claim 1. The control step includes
When the measured temperature of the melt is out of the predetermined range, the oxygen concentration of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is within the predetermined range after a predetermined time has elapsed. In this case, the amount of heat necessary for adjusting the temperature of the melt within a predetermined range is compensated by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen concentration of the oxygen-containing gas is returned to the initial state. The program according to claim 7. Waste and carbon-based supplementary fuel are introduced into the furnace body from the furnace inlet, a high temperature combustion zone is formed at the bottom of the furnace, a waste layer is formed on the high temperature combustion zone, and oxygen is added to the high temperature combustion zone. A waste temperature control device for a waste melting furnace having a tuyere for injecting a contained gas, thermally decomposing the waste, melting the thermal decomposition residue, and discharging the melt from the outlet;
Measuring means for measuring the temperature of the melt discharged;
Based on the measured temperature of the melt, means for adjusting the temperature of the oxygen-containing gas blown to the tuyere, means for adjusting the oxygen concentration of the oxygen-containing gas blown to the tuyere, A waste melting system comprising: a control means for controlling the temperature of the melt by executing a combination of a plurality of means for adjusting the amount of carbon-based auxiliary fuel input from the charging port. Furnace temperature control device. The control means includes
When the measured temperature of the melt is out of the predetermined range, the temperature of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is out of the predetermined range after a predetermined time has elapsed. In the case, the oxygen concentration of the oxygen-containing gas blown to the tuyere is further adjusted, and when the temperature of the melt is out of a predetermined range after a predetermined time has passed, the carbon-based auxiliary introduced from the charging port 14. The waste temperature control device for a waste melting furnace according to claim 13, wherein the amount of fuel is adjusted. The control means includes
When the measured temperature of the melt is out of the predetermined range, the temperature of the oxygen-containing gas blown to the tuyere is adjusted, and the temperature of the melt is within the predetermined range after a predetermined time has elapsed In addition, the amount of heat necessary for adjusting the temperature of the melt within a predetermined range is compensated by adjusting the input amount of the carbon-based auxiliary fuel, and the oxygen-containing gas temperature is returned to the initial state. The waste temperature control device for a waste melting furnace according to claim 13.

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