JP2015027649A - Gas treatment apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably perform exhaust gas treatment.SOLUTION: A gas treatment apparatus reduces the concentration of NOcontained in exhaust gas discharged from a treatment furnace by injecting ammonia into the exhaust gas. The gas treatment apparatus includes: a storage part 106 which stores ammonia injection reference information showing correspondence relation between the amount of NOin the exhaust gas and the ammonia injection amount, a NOamount calculation part 102 which calculates a NOamount in the exhaust gas, an ammonia injection amount calculation part 104 which calculates an ammonia injection amount corresponding to the calculated NOamount based on the ammonia injection reference information, a correction part 110 which corrects the calculated ammonia injection amount and calculates an ammonia injection amount after the correction, an ammonia flow rate control part 111 which injects ammonia based on the ammonia injection amount after the correction, an actual ammonia flow rate calculation part 113 which calculates an actual ammonia injection amount, and an update part 115 which updates the ammonia injection reference information based on the actual ammonia injection amount.

Description

  The present invention relates to a gas processing apparatus and a gas processing method.

Waste treatment facilities that treat waste and other waste include nitrogen oxides (NO _x ) and acid gases (HCl, SO _x ) contained in exhaust gas discharged from waste treatment furnaces such as melting furnaces and incinerators. ) removing, NO _x concentration, HCl concentration, exhaust gas treatment equipment for the regulating value or less SO _x concentration and the like are provided. The exhaust gas treatment system, for example, by NO _x react chemically by injecting ammonia (NH ₃₎ in the exhaust gas to decompose the NO _x into nitrogen and water, it is performed to reduce the concentration of NO _x. On the other hand, by injecting the alkaline powders such slaked lime (Ca (OH) ₂₎ in front of the flue a filtered dust collector, is HCl and SO _x and chemical reaction, reducing the concentration of HCl and SO _x Is done. At that time, if excessive ammonia is injected, there is a problem that excess ammonia is discharged to the outside as leaked ammonia. On the other hand, if the amount of ammonia injected is insufficient, the NO _x concentration in the exhaust gas exceeds the regulation value. To do. Similarly, an appropriate injection amount is important for slaked lime.

Therefore, various control devices and control methods for injecting an appropriate ammonia amount corresponding to the NO _x amount to be processed and an appropriate slaked lime amount corresponding to the acidic gas amount to be processed have been proposed (for example, the following) Patent Documents 1 and 2). For example, Patent Document 1, NO _x concentration of the denitration catalyst device inlet focuses proportional to the amount of exhaust gas passing through the denitration catalyst unit, by determining the amount of ammonia to be injected based on the amount of exhaust gas chimney outlet method for controlling the concentration of NO _x are disclosed.

JP 2003-164725 A JP 2012-50912 A

  However, the concentration of N, Cl, etc. in the garbage may change due to the change in the quality of the garbage thrown into the waste treatment facility. For example, the quality of garbage varies depending on the location and season, such as when bulky garbage increases during the moving season in urban areas, or when a large amount of vegetation is brought in the summer. Furthermore, there are cases where it is impossible to predict when and where the waste quality will change. In addition, when a sudden change in waste quality occurs, the exhaust gas treatment may become unstable.

  Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a gas processing apparatus and a gas processing method capable of stably performing exhaust gas processing.

In order to solve the above problems, a gas treatment device of the present invention is for reducing the concentration of NO _x contained in the exhaust gas by injecting ammonia into the exhaust gas discharged from the waste treatment furnace. An ammonia injection reference information storage means for storing ammonia injection reference information indicating a correspondence relationship between the NO _x amount and the ammonia injection amount in the exhaust gas, and a NO _x amount in the exhaust gas; A NO _x amount calculating means for performing correction, an ammonia injection amount calculating means for calculating an ammonia injection amount corresponding to the calculated NO _x amount based on the ammonia injection reference information, and correcting the calculated ammonia injection amount. An ammonia injection amount correction means for calculating the corrected ammonia injection amount; and the ammonia injection based on the corrected ammonia injection amount. An ammonia injection means for calculating the actual injection amount of the injected ammonia, and an ammonia injection reference information updating means for updating the ammonia injection reference information based on the actual injection quantity. .

  The gas treatment device of the present invention is a gas treatment device for reducing the concentration of acidic gas contained in the exhaust gas by injecting slaked lime into the exhaust gas discharged from the waste treatment furnace. , Slaked lime injection reference information storage means for storing slaked lime injection reference information indicating a correspondence relationship between the amount of acidic gas in the exhaust gas and the amount of slaked lime injection, and an acid gas amount calculation means for calculating the amount of acid gas in the exhaust gas And the slaked lime injection amount calculating means for calculating the slaked lime injection amount corresponding to the calculated acid gas amount based on the slaked lime injection reference information, the corrected slaked lime injection amount is corrected, and the corrected slaked lime injection Based on the slaked lime injection amount correcting means for calculating the amount, the slaked lime injection means for injecting the slaked lime based on the corrected slaked lime injection amount, and the actual injection amount of the injected slaked lime is calculated. And slaked lime injection actual amount calculating means, based on the implantation actual amount, and a slaked lime injection reference information updating means for updating the slaked lime injection reference information.

The gas treatment method of the present invention is a gas treatment method for reducing the concentration of NO _x contained in the exhaust gas by injecting ammonia into the exhaust gas discharged from the waste treatment furnace. The ammonia injection reference information storage means stores ammonia injection reference information indicating a correspondence relationship between the NO _x amount and the ammonia injection amount in the exhaust gas, and the NO _x amount calculation means stores the NO _x amount calculation means in the exhaust gas. and _the amount of NO _x calculating a amount of NO _x, the ammonia injection amount corresponding to the amount of NO _x and the calculated, and ammonia injection amount calculating step of ammonia injection amount calculating means for calculating, based on the ammonia injection reference information, the The ammonia injection amount correction means corrects the calculated ammonia injection amount, and calculates the ammonia injection amount after correction. Ammonia injection step for injecting the ammonia based on the corrected ammonia injection amount, and an ammonia injection actual amount calculation means for calculating the actual injection amount of the injected ammonia. An injection performance amount calculation step and an ammonia injection reference information update means include an ammonia injection reference information update step of updating the ammonia injection reference information based on the injection performance amount.

  The gas treatment method of the present invention is a gas treatment method for reducing the concentration of acidic gas contained in the exhaust gas by injecting slaked lime into the exhaust gas discharged from the waste treatment furnace. The slaked lime injection reference information storage means stores slaked lime injection reference information indicating a correspondence relationship between the amount of acidic gas in the exhaust gas and the amount of slaked lime injected, and the acid gas amount calculation means stores the amount of acid gas in the exhaust gas. An acid gas amount calculating step for calculating an acid gas amount; a slaked lime injection amount calculating step for calculating a slaked lime injection amount corresponding to the calculated acid gas amount based on the slaked lime injection reference information; and The slaked lime injection amount correcting means corrects the calculated slaked lime injection amount, and the corrected slaked lime injection amount correcting step for calculating the corrected slaked lime injection amount, Based on the slaked lime injection amount after correction, the slaked lime injection step for injecting the slaked lime, the actual injection amount of the injected slaked lime, the actual slaked lime injection actual amount calculation step for calculating the actual slaked lime injection amount calculation means, and the slaked lime injection reference information The update means comprises a slaked lime injection reference information update step for updating the slaked lime injection reference information based on the actual injection amount.

  According to such a gas processing apparatus and gas processing method of the present invention, the ammonia injection actual amount calculation means calculates the ammonia injection actual amount, and the ammonia injection reference information update means converts the ammonia injection reference information into the ammonia injection actual amount. Update based on. Further, the slaked lime injection record amount calculating means calculates the slaked lime injection record amount, and the slaked lime injection reference information updating means updates the slaked lime injection reference information based on the slaked lime injection record amount. By updating the ammonia injection reference information and slaked lime injection reference information (hereinafter collectively referred to as “injection reference information”), the range of correction by the ammonia injection amount correction means and the slaked lime injection amount correction means can be narrowed. Thus, the exhaust gas treatment can be stably performed. On the other hand, when a sudden change in waste quality occurs, the amount of correction for the injection amount of ammonia or slaked lime increases with a significant change in the N concentration or Cl concentration in the waste. However, the injection amount control may become unstable. In this case, as in the present invention, by updating the injection reference information, the correction range by the ammonia injection amount correction means and the slaked lime injection amount correction means can be narrowed, thereby stably performing the exhaust gas treatment. Can do.

  In addition, the operator may change the injection amount of ammonia or slaked lime appropriately according to the situation based on the experience, etc., but the result of the operation depends on the skill of the operator, so a stable result may not be obtained. . In this case, if the injection reference information is updated as in the present invention, the range of change of the injection amount can be narrowed, and thereby the exhaust gas treatment can be stably performed regardless of the skill of the operator. it can.

Further, the gas processing apparatus and the gas processing method of the present invention do not include a step of detecting the NO _x amount before injecting ammonia. Similarly, it does not include a step of detecting the amount of acid gas before injecting slaked lime. That is, since it is not necessary to provide a detector for detecting the NO _x amount and the acid gas amount, the device configuration is simplified, and the cost for the device configuration can be reduced.

  In the present invention, the ammonia injection reference information update unit calculates a difference between the ammonia injection amount calculated by the ammonia injection amount calculation unit and the injection actual amount calculated by the ammonia injection actual amount calculation unit, The ammonia injection reference information may be updated when the cumulative absolute value of the differences exceeds the first threshold value.

  Further, in the present invention, the slaked lime injection reference information update unit calculates a difference between the slaked lime injection amount calculated by the slaked lime injection amount calculation unit and the actual injection amount calculated by the slaked lime injection actual amount calculation unit, The slaked lime injection reference information may be updated when the accumulated absolute value of the differences exceeds the fourth threshold value.

  According to these inventions, a specific method for updating the injection reference information by updating the injection reference information at a timing based on the cumulative value of the absolute value of the difference between the calculated injection amount and the actual injection amount. Is provided.

  In the present invention, the ammonia injection reference information update unit calculates a difference between the ammonia injection amount calculated by the ammonia injection amount calculation unit and the injection actual amount calculated by the ammonia injection actual amount calculation unit, The ammonia injection reference information may be updated when the increase rate of the cumulative value of the absolute values of the differences exceeds the second threshold value.

  Further, in the present invention, the slaked lime injection reference information update unit calculates a difference between the slaked lime injection amount calculated by the slaked lime injection amount calculation unit and the actual injection amount calculated by the slaked lime injection actual amount calculation unit, The slaked lime injection reference information may be updated when the increasing rate of the cumulative value of the absolute values of the differences exceeds the fifth threshold value.

  According to these inventions, the injection reference information is updated at a timing based on the increasing rate of the cumulative value of the absolute value of the difference between the calculated value of the injection amount and the actual injection amount, thereby updating the injection reference information. Is provided.

  In the present invention, the ammonia injection reference information updating means may update the ammonia injection reference information when the time elapsed since the previous correspondence update has exceeded a third threshold.

  Moreover, in this invention, the said slaked lime injection | pouring reference | standard information update means may update the said slaked lime injection | pouring reference | standard information, when the elapsed time from the last correspondence update exceeds the 6th threshold value.

  According to these inventions, a specific method for updating the injection reference information is provided by updating the injection reference information based on the time elapsed since the previous correspondence update.

  Further, in the present invention, the ammonia injection reference information updating means obtains an average value of the actual injection amount for each exhaust gas amount, and may use the obtained average value as updated ammonia injection reference information for each exhaust gas amount. .

  Further, in the present invention, the slaked lime injection reference information updating unit obtains an average value of the actual injection amount for each exhaust gas amount, and may use the obtained average value as updated slaked lime injection reference information for each exhaust gas amount. .

  According to these inventions, the updated injection reference information that matches the actual injection amount can be obtained by using the average value of the actual injection amount for each exhaust gas amount as the updated injection reference information for each exhaust gas amount. it can. When the updated injection reference information matches the actual injection amount, the correction range by the ammonia injection amount correction unit and the slaked lime injection amount correction unit can be narrowed, whereby the exhaust gas treatment can be performed stably.

  Further, in the present invention, the ammonia injection reference information update means calculates the exhaust gas amount in a range where the actual injection amount is not calculated, for an exhaust gas amount smaller than the exhaust gas amount in the range where the actual injection amount is calculated. The minimum value of the actual injection amount that has been used is the updated ammonia injection reference information in the range in which the actual injection amount has not been calculated, and for an exhaust gas amount that is greater than the exhaust gas amount in the range in which the actual injection amount has been calculated The estimated injection actual amount estimated according to the increase rate in the calculated actual injection amount may be used as the updated ammonia injection reference information in the range where the actual injection amount is not calculated.

  Further, in the present invention, the slaked lime injection reference information updating means calculates the exhaust gas amount that is smaller than the exhaust gas amount in the range in which the actual injection amount is calculated in the range in which the actual injection amount is not calculated. For the exhaust gas amount larger than the exhaust gas amount in the range where the actual injection amount is calculated, the minimum value of the actual injection amount obtained is the updated slaked lime injection reference information in the range where the actual injection amount was not calculated. The estimated actual injection amount estimated according to the rate of increase in the calculated actual injection amount may be used as updated slaked lime injection reference information in a range where the actual injection amount is not calculated.

  According to these inventions, even in a range where the actual injection amount has not been calculated, the updated injection reference information can be estimated using the actual injection amount calculated up to that point.

  ADVANTAGE OF THE INVENTION According to this invention, the gas processing apparatus and gas processing method which make it possible to perform waste gas processing stably can be provided.

It is a schematic diagram in case the gas treatment facility 1 of this embodiment is provided in the waste treatment facility. 2 is a hardware configuration diagram of a control device 10. FIG. 2 is a block diagram for explaining a functional configuration of a control device 10; FIG. It is a graph showing the correlation between direct proportionality between the exhaust gas flow rate and the amount of NO _x. It is a figure which shows the correlation of the direct proportion between exhaust gas flow volume and acidic gas amount. It is a figure which shows an example of the ammonia blowing reference | standard information stored in the storage part. It is a figure which shows an example of the ammonia blowing reference | standard information stored in the storage part. It is a figure which shows an example of the slaked lime blowing reference | standard information stored in the storage part. It is a figure which shows the correspondence of a control output and a 1st correction coefficient. It is a figure which shows the correspondence of a control output and a 2nd correction coefficient. It is a figure which shows that the update part 115 updated the blowing reference | standard information. It is a figure which shows the method in which the update part 115 updates blowing reference | standard information. It is a figure which imagines that the update part 115 determines the timing which updates the blowing reference | standard information based on the cumulative value of the absolute value of the difference of the calculation blowing amount of a chemical | medical agent, and the actual blowing amount. It is a figure which imagines that the update part 115 determines the timing which updates the blowing reference | standard information based on the increase rate of the cumulative value of the absolute value of the difference of the calculation blowing amount of medicine, and the actual blowing amount. 3 is a flowchart showing the operation of the control device 10. It is a figure for demonstrating the effect of this embodiment (Example). It is a figure for demonstrating the effect of this embodiment (comparative example).

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a gas processing apparatus and a gas processing method according to the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The drawings described below are merely illustrative for explaining the gas processing apparatus and the gas processing method of the present invention, and the dimensions and the like of the respective parts shown in the drawings are the same as those in the actual gas processing apparatus and the gas processing method. May differ from dimensions.

(Overall configuration of gas treatment facility 1)
First, a configuration of a gas processing facility 1 including a control device 10 (corresponding to a “gas processing device” in the claims) according to an embodiment of the present invention will be described with reference to FIG. The control device 10 is a gas processing device for reducing the concentration of NO _x or acid gas contained in the exhaust gas by injecting ammonia or slaked lime into the exhaust gas discharged from the waste treatment furnace. FIG. 1 is a schematic view when the gas treatment facility 1 of the present embodiment is provided in a waste treatment facility. Exhaust gas discharged from a waste treatment furnace 41 such as a melting furnace or an incinerator is sent to a boiler 43 through a combustion chamber 42 and recovered, and then cooled to a predetermined temperature by an exhaust gas temperature controller 44. The dust is removed by the duster 45. The dust-removed exhaust gas is sent to the denitration catalyst device 47 by the induction fan 46, denitrated in the denitration catalyst device 47, and then discharged from the chimney 48. Moreover, in the filtration type dust collector 45, the reaction product of slaked lime (Ca (OH) ₂ ) and acidic gas (HCl, SO _x, etc.) is collected and collected in a dry state.

In the denitration catalyst device 47, nitrogen oxide (NO _x ) contained in the exhaust gas reacts with ammonia (NH ₃ ) adsorbed on the catalyst layer disposed inside the device, and is decomposed into nitrogen and water. Note that the catalyst is mainly composed of titanium oxide (TiO ₂ ), and active components such as vanadium oxide (V ₂ O ₅ ) and tungsten oxide (WO ₃ ) are added. The end of the ammonia pipe 62 is connected to the exhaust gas pipe 61 provided between the induction fan 46 and the denitration catalyst device 47. Ammonia fed from the ammonia supply device 20 provided at the starting end of the ammonia pipeline 62 through the ammonia pipeline 62 is supplied into the denitration catalyst device 47 by being blown into the exhaust gas pipeline 61. Incidentally, the reaction equation between NO _x and ammonia are as example the following equation (1).
4NO + 4NH ₃ + O ₂ → 4N ₂ + 6H ₂ O (1)

Further, alkaline powder such as slaked lime (Ca (OH) ₂ ) is blown into the flue 63 in front of the filtration dust collector 45, and the reaction product is collected in the filtration dust collector 45 in a dry state. to recover. The reaction formula of acid gas (HCl or SO _x ) and slaked lime at this time is, for example, the following formulas (2) and (3). Calcium chloride (CaCl ₂ ) and the like produced by the following reaction formula are collected as dust by the filtration dust collector 45.
Ca (OH) ₂ + 2HCl → CaCl ₂ + 2H ₂ O (2)
Ca (OH) ₂ + SO ₂ → CaSO ₃ + H ₂ O (3)

A control valve 55 is provided on the ammonia pipe 62, and the degree of opening and closing of the control valve 55 is controlled by the control device 10 (more specifically, the ammonia flow rate adjusting unit 111 as will be described later). The amount of ammonia blown is adjusted. The control device 10 calculates the ammonia injection amount (ammonia injection amount) based on the outputs of the NO _x analyzer 52 and the exhaust gas flow meter 51 installed in the chimney 48, and controls the degree of opening and closing of the control valve 55. thereby reducing the chimney outlet concentration of NO _x in the chimney outlet.

  Further, a control valve 56 is provided on the route of the slaked lime pipe 64, and the degree of opening and closing of the control valve 56 is controlled by the control device 10 (more specifically, as will be described later, the slaked lime flow rate adjusting unit 112). The amount of slaked lime is adjusted. The control device 10 calculates the slaked lime blowing amount (slaked lime injection amount) based on the outputs of the acid gas analyzer 53 and the exhaust gas flow meter 51 installed in the chimney 48, and controls the open / close degree of the control valve 56, The smoke outlet acid gas concentration at the smoke outlet is reduced.

Although not shown in FIG. 1, the ammonia supply device 20, the slaked lime supply device 30, the control valves 55 and 56, the exhaust gas flow meter 51, the ammonia flow meter 54, the slaked lime flow meter 57, and the NO _x analyzer 52. Various devices and measuring instruments such as the acid gas analyzer 53 are connected to the control device 10 so that information can be transmitted and received and controlled.

(Configuration of control device 10)
Hereinafter, the configuration of the control device 10 will be described in detail. FIG. 2 is a hardware configuration diagram of the control device 10. As shown in FIG. 2, the control device 10 physically includes a CPU 11, a main storage device such as a ROM 12 and a RAM 13, an input device 14 such as a keyboard and a mouse, an output device 15 such as a display, various measuring devices and controls. It is configured as a normal computer system including a communication module 16 such as a network card for transmitting and receiving data to and from the valve, an auxiliary storage device 17 such as a hard disk, and the like. Each function of the control device 10 to be described later operates the input device 14, the output device 15, and the communication module 16 under the control of the CPU 11 by reading predetermined computer software on the hardware such as the CPU 11, the ROM 12, and the RAM 13. In addition, it is realized by reading and writing data in the main storage devices 12 and 13 and the auxiliary storage device 17.

FIG. 3 is a block diagram for explaining a functional configuration of the control device 10. As shown in FIG. 3, the control device 10 functionally includes an exhaust gas flow rate calculation unit 101, a NO _x amount calculation unit 102 (corresponding to “NO _x amount calculation means” in the claims), an acid gas, An amount calculation unit 103 (corresponding to “acid gas amount calculation means” in claims), an ammonia injection amount calculation unit 104 (corresponding to “ammonia injection amount calculation means” in claims), and a slaked lime injection amount calculation A unit 105 (corresponding to “slaked lime injection amount calculating means” in claims) and a storage unit 106 (corresponding to “ammonia injection reference information storage means” and “slaked lime injection reference information storage means” in claims); , the chimney outlet concentration of NO _x adjustment unit 107, and the chimney outlet acid gas concentration regulating unit 108, a control output tendency calculation unit 109, "ammonia injection amount correction means" in the correction section 110 (the claims and "hydrated lime Notes Equivalent to “amount correction means”, an ammonia flow rate adjusting unit 111 (corresponding to “ammonia injection means” in claims), and a slaked lime flow rate adjusting unit 112 (corresponding to “slaked lime injection means” in claims); The actual ammonia flow rate calculation unit 113 (corresponding to “Ammonia injection actual amount calculation means” in the claims), and the actual slaked lime flow rate calculation unit 114 (corresponds to “Slaked lime injection actual amount calculation means” in the claims), And an update unit 115 (corresponding to “ammonia injection reference information update means” and “slaked lime injection reference information update means” in the claims).

The exhaust gas flow rate calculation unit 101 calculates the exhaust gas flow rate based on the output of the exhaust gas flow meter 51 installed in the chimney 48. The exhaust gas flow rate calculated by the exhaust gas flow rate calculation unit 101 is output to the NO _x amount calculation unit 102 and the acidic gas amount calculation unit 103.

_The amount of NO _x calculating unit 102, based on the exhaust gas flow rate gas flow rate calculating unit 101 calculates, and calculates the amount of NO _x in the exhaust gas. _The amount of NO _x calculating unit 102, for example, based on the correlation shown in FIG. 4, it is possible to calculate the amount of NO _x exhaust gas flow rate as an input value. As shown in FIG. 4, there is a correlation between the direct proportion between the exhaust gas flow rate and the amount of NO _x. Although illustration is omitted, a separate storage unit for storing information indicating the correlation may be provided, and the information may be stored in advance in the NO _x amount calculation unit 102. The NO _x amount calculation unit 102 outputs the calculated NO _x amount to the ammonia injection amount calculation unit 104.

  The acidic gas amount calculation unit 103 calculates the acidic gas amount in the exhaust gas based on the exhaust gas flow rate calculated by the exhaust gas flow rate calculation unit 101. The acidic gas amount calculation unit 103 can calculate the acidic gas amount using the exhaust gas flow rate as an input value based on, for example, the correlation shown in FIG. In addition, as shown in FIG. 5, there is a direct proportional correlation between the exhaust gas flow rate and the acid gas amount. Although illustration is omitted, a separate storage unit for storing information indicating the correlation may be provided, and the information may be stored in advance in the acid gas amount calculation unit 103. The acid gas amount calculation unit 103 outputs the calculated acid gas amount to the slaked lime blowing amount calculation unit 105.

The ammonia injection amount calculation unit 104 calculates the ammonia injection amount corresponding to the NO _x amount calculated by the NO _x amount calculation unit 102 based on ammonia injection reference information (corresponding to “ammonia injection reference information” in the claims). To do. The ammonia blowing reference information is information indicating a correspondence relationship between the NO _x amount in the exhaust gas and the ammonia blowing amount, and is stored in the storage unit 106. FIG. 6 shows an example of ammonia injection reference information stored in the storage unit 106. The ammonia injection amount calculation unit 104 can calculate the ammonia injection amount using the NO _x amount as an input value based on the information as shown in FIG. The ammonia blowing amount calculation unit 104 outputs the calculated ammonia blowing amount to the correction unit 110.

Further, the ammonia injection amount calculation unit 104 may be configured to calculate the ammonia injection amount based on the correlation between the NO _x amount and the ammonia injection amount as shown in FIG. In the example of FIG. 7, when the NO _x amount is equal to or less than c (Nm ³ / h), the ammonia injection amount is set to a constant value, and the minimum ammonia injection amount is set. On the other hand, when c (Nm ³ / h) is exceeded, the ammonia injection amount is increased according to the amount of NO _x . Here, as c, for example, if the maximum NO _x amount is 18 Nm ³ / h, it can be 10% of 1.8 Nm ³ / h. In FIG. 7, the correspondence between the NO _x amount and the ammonia blowing amount is calculated based on the ammonia equivalent ratio (0.7 to 1.3). The equivalent ratio is in the commissioning of the waste treatment facility, measuring the input / NO _x amount and the denitrification rate of the output of the denitration catalyst device 47 is determined to verify.

  The slaked lime blowing amount calculation unit 105 calculates the slaked lime blowing amount corresponding to the acidic gas amount calculated by the acidic gas amount calculation unit 103 based on slaked lime blowing reference information (corresponding to “slaked lime injection reference information” in the claims). To do. The slaked lime blowing reference information is information indicating a correspondence relationship between the amount of acidic gas in the exhaust gas and the slaked lime blowing amount, and is stored in the storage unit 106. FIG. 8 shows an example of slaked lime blowing reference information stored in the storage unit 106. The slaked lime blowing amount calculation unit 105 can calculate the slaked lime blowing amount based on the information as shown in FIG. 8 using the acidic gas amount as an input value. The slaked lime blowing amount calculation unit 105 outputs the calculated slaked lime blowing amount to the correction unit 110.

Chimney exit concentration of NO _x adjustment unit 107, based on the output of the NO _x analyzer 52 installed in the chimney 48, and calculates a control output (operation output). More specifically, proportional to the deviation of the measured values of the chimney outlet concentration of NO _x in the chimney outlet obtained by NO _x analyzer 52, a target value of the chimney outlet concentration of NO _x that is input using an input device (not shown) The control output to be calculated is in the range of 0 to 100%. The smoke outlet NO _x concentration adjusting unit 107 outputs the calculated control output to the control output tendency calculating unit 109.

Control output trend calculation unit 109 calculates the time average value of the control output chimney outlet concentration of NO _x adjustment unit 107 has calculated (for example, the average value of the control output per hour), time average of the control output that the calculated The value is output to the correction unit 110.

  The correction unit 110 corrects the ammonia injection amount calculated by the ammonia injection amount calculation unit 104, and calculates the corrected ammonia injection amount. First, the correction unit 110 calculates the first correction coefficient based on the time average value of the control output input from the control output tendency calculation unit 109. The first correction coefficient is for correcting the ammonia injection amount calculated by the ammonia injection amount calculation unit 104. For example, the correction unit 110 calculates the first correction coefficient based on the correspondence between the control output and the first correction coefficient as shown in FIG. That is, when the control output is not less than b1% and not more than b2%, the first correction coefficient is set to 1, and when the control output is less than b1%, the first correction coefficient is made smaller than 1 according to the magnitude of the control output ( For example, when the control output is 0%, the first correction coefficient is set to 0.9.) When the control output exceeds b2%, the first correction coefficient is made larger than 1 according to the magnitude of the control output ( For example, when the control output is 100%, the first correction coefficient is 1.1.) Here, for example, b1 may be 20 to 30%, and b2 may be 70 to 80%, for example.

  The correction unit 110 corrects the ammonia injection amount by multiplying the ammonia injection amount calculated by the ammonia injection amount calculation unit 104 by the calculated first correction coefficient, and calculates the corrected ammonia injection amount. The correcting unit 110 outputs the calculated corrected ammonia injection amount to the ammonia flow rate adjusting unit 111.

  On the other hand, the same structure is made with respect to acid gas. That is, the smoke outlet acidic gas concentration adjusting unit 108 calculates the control output (operation output) based on the output of the acidic gas analyzer 53 installed in the chimney 48. Specifically, it is proportional to the deviation between the measured value of the smoke outlet acidic gas concentration at the smoke outlet obtained by the acid gas analyzer 53 and the target value of the smoke outlet acidic gas concentration input using an input device (not shown). The control output to be calculated is in the range of 0 to 100%. The smoke outlet acidic gas concentration adjusting unit 108 outputs the calculated control output to the control output tendency calculating unit 109.

  The control output tendency calculation unit 109 calculates the time average value of the control output calculated by the smoke outlet acidic gas concentration adjustment unit 108 (for example, the average value of the control output per hour), and calculates the time average of the calculated control output. The value is output to the correction unit 110.

  The correction | amendment part 110 correct | amends with respect to the slaked lime blowing amount which the slaked lime blowing amount calculation part 105 computed, and calculates the slaked lime blowing amount after correction | amendment. First, the correction unit 110 calculates the second correction coefficient based on the time average value of the control output input from the control output tendency calculation unit 109. The second correction coefficient is for correcting the slaked lime blowing amount calculated by the slaked lime blowing amount calculation unit 105. For example, the correction unit 110 calculates the second correction coefficient based on the correspondence relationship between the control output and the second correction coefficient as illustrated in FIG. The correction unit 110 can calculate the second correction coefficient by the same method as that for calculating the first correction coefficient.

  The correction unit 110 multiplies the slaked lime blowing amount calculated by the slaked lime blowing amount calculation unit 105 by the calculated second correction coefficient, corrects the slaked lime blowing amount, and calculates the corrected slaked lime blowing amount. The correcting unit 110 outputs the calculated corrected slaked lime blowing amount to the slaked lime flow rate adjusting unit 112.

  The ammonia flow rate adjustment unit 111 is configured to inject ammonia into the flue 62 based on the corrected ammonia injection amount input from the correction unit 110. Specifically, the ammonia flow rate adjusting unit 111 controls the degree of opening and closing of the control valve 55 by, for example, outputting a control signal proportional to the corrected ammonia blowing amount, and blows ammonia into the flue 62.

  The slaked lime flow rate adjustment unit 112 blows slaked lime into the flue 64 based on the corrected slaked lime blowing amount input from the correction unit 110. Specifically, the slaked lime flow rate adjusting unit 112 controls the degree of opening and closing of the control valve 56 by, for example, outputting a control signal proportional to the corrected slaked lime blowing amount, and blows slaked lime into the flue 64.

  The actual ammonia flow rate calculation unit 113 calculates the actual injection amount (injection actual amount) of ammonia injected by the ammonia flow rate adjustment unit 111. The actual ammonia flow rate calculation unit 113 calculates the actual injection amount of ammonia based on the output from the ammonia flow meter 54. The actual ammonia flow rate calculation unit 113 outputs the calculated ammonia blowing actual amount to the update unit 115.

  The actual slaked lime flow rate calculation unit 114 calculates the actual amount of slaked lime blown by the slaked lime flow rate adjustment unit 112. The actual slaked lime flow rate calculation unit 114 calculates the actual slaked lime blowing amount based on the output from the slaked lime flow meter 57. The actual slaked lime flow rate calculation unit 114 outputs the calculated slaked lime blowing actual amount to the update unit 115.

  The updating unit 115 updates the ammonia blowing reference information based on the blowing actual amount input from the actual ammonia flow rate calculating unit 113. For example, the update unit 115 updates the ammonia injection reference information by obtaining an average value of the actual blowing amount for each exhaust gas amount and using the obtained average value as the updated ammonia injection reference information for each exhaust gas amount. The updating unit 115 also updates the slaked lime blowing reference information based on the blowing actual amount input from the actual slaked lime flow rate calculating unit 114. The update unit 115 updates the slaked lime blowing reference information by, for example, obtaining an average value of the actual blowing amount for each exhaust gas amount and using the obtained average value as updated slaked lime blowing reference information for each exhaust gas amount.

  FIG. 11 is a diagram showing that the updating unit 115 has updated the ammonia blowing reference information and the slaked lime blowing reference information (hereinafter, collectively referred to as “blowing reference information” or “polyline”). In FIG. 11A, a graph G1 shows a broken line before update. A large number of points P1, P2, P3,... In FIG. It can be seen that there is a large difference (for example, d) between the broken line G1 before the update and the actual blowing amount. That is, it can be seen that when the medicine such as ammonia or slaked lime is actually blown, a large correction is made to the amount of the medicine blown. On the other hand, the graph G2 is a graph obtained by obtaining an average value of the actual blowing amount for each exhaust gas amount and smoothing the obtained average value. FIG. 11B shows that the broken line is changed from the broken line G1 before update displayed by a broken line to the updated broken line G2 displayed by a solid line.

  In addition, the update unit 115 sets the minimum value of the calculated actual blowing amount for the exhaust gas amount smaller than the exhaust gas amount in the range where the actual blowing amount is calculated in the range where the actual blowing amount is not calculated. It is set as the updated blowing reference information in the range where the actual blowing amount is not calculated. Further, the update unit 115, for an exhaust gas amount larger than the exhaust gas amount in the range in which the actual blowing amount is calculated, estimates the estimated actual blowing amount (estimated injection actual result) estimated according to the increase rate in the calculated actual blowing amount. Amount) is the updated reference information in the range in which the actual amount of blowing is not calculated.

  FIG. 12 is a diagram illustrating a method in which the update unit 115 updates the blowing reference information. In the range in which the actual blow amount is calculated (region (a) shown in FIG. 12), the updating unit 115 obtains the average value A1 of the actual blow amounts P4, P5, and P6 in the exhaust gas amount H1, for example. And the area | region (a) part of the graph G2 can be created by smoothing and connecting the average value of the actual blow amount obtained for each exhaust gas amount. Or the update part 115 calculated | required average value A2 of the blowing performance amount P4, P5, P6, P7, P8 ... which belongs to the predetermined average value calculation area shown in FIG. 12, and calculated | required with respect to each average value calculation area, respectively. The region (a) part of the graph G2 can be created by smoothing and connecting the average values of the actual blowing amounts. Or the area | region (a) part of graph G2 can be created by smoothing and connecting the average value of the blowing performance amount calculated | required with both the above methods. FIG. 12 shows a case where the average value of the actual blowing amount is obtained by both methods.

  On the other hand, in the case of the range in which the actual blown amount is not calculated, particularly the range of the exhaust gas amount smaller than the exhaust gas amount in the region (a) in which the blown actual amount is calculated (region (b) shown in FIG. 12), the update unit 115 sets the minimum value B1 of the actual blowing amount calculated in the area (a) as the updated blowing reference information in the area (b). In addition, in the case of the range in which the actual blown amount is not calculated, particularly the exhaust gas amount range (region (c) shown in FIG. 12) larger than the exhaust gas amount in the region (a) in which the blown actual amount is calculated, the updating unit 115. Is the estimated inflow actual amount (B2 in FIG. 12) estimated according to the increase rate of the inflow actual amount calculated in the region (a), that is, while maintaining the slope of the graph G2 in the region (a) in FIG. And B3) are used as the updated reference information for the area (c). In addition, in the area (b) and the area (c), the above-described method may be reversed to obtain the updated blowing reference information.

  Regarding the timing for updating the injection reference information, the update unit 115 calculates the difference between the ammonia injection amount calculated by the ammonia injection amount calculation unit 104 and the actual injection amount calculated by the actual ammonia flow rate calculation unit 113, and the difference When the cumulative absolute value exceeds the first threshold value, the ammonia blowing reference information may be updated. Similarly, the updating unit 115 calculates a difference between the slaked lime blowing amount calculated by the slaked lime blowing amount calculating unit 105 and the blowing actual amount calculated by the actual slaked lime flow rate calculating unit 114, and the cumulative value of the absolute value of the difference is calculated. When the fourth threshold value is exceeded, the slaked lime blowing reference information may be updated.

  FIG. 13 is a diagram imagining that the updating unit 115 determines the timing for updating the reference information on the basis of the cumulative value of the absolute value of the difference between the calculated infusion amount and the actual infusion amount. As shown in FIG. 13, the deviation between the calculated infusion amount and the actual infusion amount of the medicine is calculated for each number of insufflations, and the accumulated absolute value exceeds 1000, which is an example of the first threshold value or the fourth threshold value. Then, the update unit 115 updates the blowing reference information. In the example of FIG. 13, the blowing reference information is updated after the 54th blowing, and the changed blowing reference information is applied from the 55th blowing. In the example of FIG. 13, the accumulation of absolute values of deviation may be performed on a daily basis, or the accumulated value of absolute values may be reset every 24 hours.

  Regarding another timing for updating the injection reference information, the update unit 115 calculates the difference between the ammonia injection amount calculated by the ammonia injection amount calculation unit 104 and the injection actual amount calculated by the actual ammonia flow rate calculation unit 113, and The ammonia injection reference information may be updated when the increasing rate of the cumulative value of the absolute values of the differences exceeds the second threshold value. Similarly, the updating unit 115 calculates the difference between the slaked lime blowing amount calculated by the slaked lime blowing amount calculating unit 105 and the blowing actual amount calculated by the actual slaked lime flow rate calculating unit 114, and the cumulative value of the absolute value of the difference is calculated. When the increase rate exceeds the fifth threshold, the slaked lime blowing reference information may be updated.

  FIG. 14 is a diagram imagining that the update unit 115 determines the timing for updating the blowing reference information, based on the increasing rate of the cumulative absolute value of the difference between the calculated blowing amount and the actual blowing amount of the medicine. In FIG. 14, the cumulative value at the time when the broken line is updated (the cumulative value of the absolute value of the difference between the calculated blowing amount and the actual blowing amount) is set to 0, and the absolute value of the deviation between the broken line and the blowing actual amount is elapsed over time. The graph is accumulated together with the graph G3. Then, at the timing when the slope of the graph G3 changes (the timing at which the increase rate of the absolute value of the difference between the calculated blowing amount and the actual blowing amount exceeds the second threshold value or the fifth threshold value), the updating unit 115 blows. Update reference information.

  Regarding yet another timing for updating the blowing reference information, the update unit 115, when the time elapsed since the previous correspondence update has exceeded the third threshold or the sixth threshold (for example, one day, one week, etc.) The ammonia blowing reference information may be updated.

(Operation of the control device 10)
Next, operations performed by the control device 10 will be described with reference to FIG. FIG. 15 is a flowchart showing the operation of the control device 10.

First, the exhaust gas flow rate calculation unit 101 calculates the exhaust gas flow rate based on the output of the exhaust gas flow meter 51 installed in the chimney 48. The exhaust gas flow rate calculated by the exhaust gas flow rate calculation unit 101 is output to the NO _x amount calculation unit 102 and the acidic gas amount calculation unit 103 (step S1).

Then, _the amount of NO _x calculating unit 102, based on the exhaust gas flow rate gas flow rate calculating unit 101 calculates, for calculating the amount of NO _x in the exhaust gas. The NO _x amount calculation unit 102 outputs the calculated NO _x amount to the ammonia injection amount calculation unit 104. On the other hand, the acidic gas amount calculation unit 103 calculates the acidic gas amount in the exhaust gas based on the exhaust gas flow rate calculated by the exhaust gas flow rate calculation unit 101. The acid gas amount calculation unit 103 outputs the calculated acid gas amount to the slaked lime blowing amount calculation unit 105 (corresponding to “NO _x amount calculation step” and “acid gas amount calculation step” in the claims). .

Then, ammonia blow amount calculating unit 104, the ammonia blown amount corresponding to the amount of NO _x amount of NO _x calculating unit 102 calculates, calculated on the basis of ammonia blowing reference information. The ammonia blowing amount calculation unit 104 outputs the calculated ammonia blowing amount to the correction unit 110. On the other hand, the slaked lime blowing amount calculation unit 105 calculates the slaked lime blowing amount corresponding to the acidic gas amount calculated by the acidic gas amount calculation unit 103 based on the slaked lime blowing reference information. The slaked lime blowing amount calculation unit 105 outputs the calculated slaked lime blowing amount to the correction unit 110 (corresponding to “ammonia injection amount calculation step” and “slaked lime injection amount calculation step” in the claims).

  Next, the correction unit 110 corrects the ammonia injection amount calculated by the ammonia injection amount calculation unit 104 and calculates the corrected ammonia injection amount. Furthermore, the correction | amendment part 110 corrects with respect to the slaked lime blowing amount which the slaked lime blowing amount calculation part 105 calculated, and calculates the slaked lime blowing amount after correction | amendment (step S4, "ammonia injection amount correction step of a claim) And “corresponding to the slaked lime injection amount correction step”).

  Next, the ammonia flow rate adjusting unit 111 blows ammonia into the flue 62 based on the corrected ammonia blowing amount input from the correcting unit 110. On the other hand, the slaked lime flow rate adjusting unit 112 blows slaked lime into the flue 64 based on the corrected slaked lime blowing amount input from the correcting unit 110 (step S5, “ammonia injection step” and “slaked lime” in claims). Equivalent to “injection step”).

  Next, the actual ammonia flow rate calculation unit 113 calculates the actual amount of ammonia blown in by the ammonia flow rate adjustment unit 111. The actual ammonia flow rate calculation unit 113 outputs the calculated ammonia blowing actual amount to the update unit 115. On the other hand, the actual slaked lime flow rate calculation unit 114 calculates the actual amount of slaked lime blown by the slaked lime flow rate adjustment unit 112. The actual slaked lime flow rate calculation unit 114 outputs the calculated slaked lime blowing actual amount to the updating unit 115 (step S6, equivalent to “Ammonia injection actual amount calculation step” and “Slaked lime injection actual amount calculation step” in the claims) ).

  Next, the updating unit 115 updates the ammonia blowing reference information based on the blowing actual amount input from the actual ammonia flow rate calculating unit 113. Further, the updating unit 115 updates the slaked lime blowing reference information based on the actual blowing amount input from the actual slaked lime flow rate calculating unit 114 (step S7, “ammonia injection reference information updating step” and “slaked lime injection” in claims). Corresponds to “reference information update step”).

  Then, the effect | action and effect of this embodiment are demonstrated. According to the present embodiment, the actual ammonia flow rate calculation unit 113 calculates the actual injection amount of ammonia, and the update unit 115 updates the ammonia injection reference information based on the actual ammonia injection amount. Moreover, the actual slaked lime flow rate calculation unit 114 calculates the actual slaked lime blowing amount, and the updating unit 115 updates the slaked lime blowing reference information based on the actual slaked lime blowing actual amount. By updating the ammonia blowing reference information and the slaked lime blowing reference information (hereinafter collectively referred to as “blowing reference information”), it is possible to narrow the range of correction by the correction unit 110, thereby stably performing exhaust gas treatment. be able to. On the other hand, when a sudden change in waste quality occurs, the amount of correction for the amount of ammonia or slaked lime increases due to a significant change in the concentration of N or Cl in the waste. However, the blow amount control may become unstable. In this case, as in the present embodiment, by updating the blowing reference information, the correction range by the correction unit 110 can be narrowed, whereby the exhaust gas treatment can be performed stably.

  16 and 17 are diagrams for explaining the effect of this embodiment. FIG. 16 shows a case where the broken line and the actual blow amount match (Example). FIG. 16A shows a state in which, for example, in factory A, an amount of slaked lime that is close to the amount indicated by the broken line is being blown. As a result, as shown in FIG. 16B, the actual HCl concentration value at the smoke outlet is stably managed. In particular, in FIG. 16B, a certain margin can be provided between the HCl concentration actual value and the management value, and the amount of slaked lime can be reduced by this margin. In other words, since the HCl concentration actual value at the smoke outlet can be stably managed, the amount of slaked lime can be reduced until the HCl concentration is just below the control value, and the cost can be reduced by the amount of the reduced slaked lime. Can do.

  On the other hand, FIG. 17 shows a case where the broken line does not match the blow amount record (comparative example). FIG. 17A shows a state in which, for example, in factory B, the amount of slaked lime that has been greatly corrected from the amount indicated by the broken line is actually being blown. As a result, as shown in FIG. 17B, the actual HCl concentration value at the smoke outlet is greatly shaken, and stable management cannot be performed. In particular, in FIG. 17B, there is no allowance between the HCl concentration actual value and the management value, and the reduction of the amount of slaked lime as shown in FIG. 16B cannot be achieved.

  In addition, the operator may change the amount of ammonia or slaked lime as appropriate depending on the situation based on experience, but the result of the operation depends on the skill of the operator, so a stable result may not be obtained. . In this case, if the blowing reference information is updated as in the present embodiment, the range of change in the blowing amount can be narrowed, whereby the exhaust gas treatment can be stably performed regardless of the skill of the operator. Can do.

Moreover, in this embodiment, the process of detecting the amount of NO _x before injecting ammonia is not included. Similarly, it does not include a step of detecting the amount of acid gas before blowing slaked lime. That is, since it is not necessary to provide a detector for detecting the NO _x amount and the acid gas amount, the device configuration is simplified, and the cost for the device configuration can be reduced.

  In addition, according to the present embodiment, the specific information for updating the blowing reference information by updating the blowing reference information at a timing based on the cumulative value of the absolute value of the difference between the calculated value of the blowing amount and the actual blowing amount. Techniques are provided.

  Moreover, according to this embodiment, in order to update the blowing reference information by updating the blowing reference information at a timing based on the increasing rate of the cumulative value of the absolute value of the difference between the calculated value of the blowing amount and the actual blowing amount. A specific method is provided.

  Moreover, according to this embodiment, the specific method for updating the blowing reference information is provided by updating the blowing reference information based on the time elapsed since the previous correspondence update.

  In addition, according to the present embodiment, the updated reference value of the in-flow actual amount that matches the actual in-flow amount is obtained by using the average value of the in-flow actual amount for each exhaust gas amount as the updated in-flow reference information for each exhaust gas amount. be able to. When the updated injection reference information matches the actual injection amount, the correction range by the correction unit 110 can be narrowed, whereby the exhaust gas treatment can be performed stably.

  Moreover, according to this embodiment, even in the range where the actual amount of blowing is not calculated, the updated reference information can be estimated using the actual amount of blowing calculated up to that point.

  As mentioned above, although preferred embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to the said embodiment.

  For example, in the above embodiment, the control device 10 controls the concentration of both ammonia and slaked lime. However, the present invention is not limited to this. For example, the concentration control of ammonia and the concentration control of slaked lime are separate devices. It may be done separately.

1 ... gas processing facility, 10 ... controller, 101 ... exhaust gas flow rate calculation unit, 102 ... NO _x amount calculating section, 103 ... acid gas amount calculating section, 104 ... ammonia blow amount calculation unit, 105 ... vanishing stone cupellation write amount calculating unit, 106 ... storage unit, 107 ... chimney outlet concentration of NO _x adjustment unit, 108 ... chimney outlet acidic gas concentration adjusting unit, 109 ... control output tendency calculation unit, 110 ... correction unit, 111 ... ammonia flow rate regulator, 112 ... hydrated lime flow regulation 113: Actual ammonia flow rate calculation unit, 114 ... Actual slaked lime flow rate calculation unit, 115 ... Update unit, 20 ... Ammonia supply device, 30 ... Slaked lime supply device, 41 ... Waste treatment furnace, 42 ... Combustion chamber, 43 ... Boiler , 44 ... exhaust gas temperature controller, 45 ... filtration type dust collector, 46 ... induced draft fan, 47 ... denitration catalyst unit, 48 ... chimney, 51 ... exhaust gas flowmeter, 52 ... NO _x analyzer 53 ... Acid gas analyzer, 54 ... Ammonia flow meter, 55 ... Control valve, 56 ... Control valve, 57 ... Slaked lime flow meter, 61 ... Exhaust gas line, 62 ... Ammonia line, 63 ... Exhaust gas line, 64 ... Slaked lime pipeline.

Claims (14)

A gas treatment device for reducing the concentration of NO _x contained in the exhaust gas by injecting ammonia into the exhaust gas discharged from the waste treatment furnace,
Ammonia injection reference information storage means for storing ammonia injection reference information indicating a correspondence relationship between the NO _x amount and the ammonia injection amount in the exhaust gas;
And _the amount of NO _x calculating means for calculating the amount of NO _x in the exhaust gas,
An ammonia injection amount calculating means for calculating an ammonia injection amount corresponding to the calculated NO _x amount based on the ammonia injection reference information;
Ammonia injection amount correction means for correcting the calculated ammonia injection amount and calculating the corrected ammonia injection amount,
Ammonia injection means for injecting the ammonia based on the corrected ammonia injection amount;
An ammonia injection actual amount calculating means for calculating the actual injection amount of the injected ammonia;
Ammonia injection reference information updating means for updating the ammonia injection reference information based on the actual injection amount,
A gas processing apparatus comprising: The ammonia injection reference information update means includes
Calculating the difference between the ammonia injection amount calculated by the ammonia injection amount calculating means and the injection actual amount calculated by the ammonia injection actual amount calculating means;
The gas processing apparatus according to claim 1, wherein the ammonia injection reference information is updated when a cumulative value of absolute values of the differences exceeds a first threshold value. The ammonia injection reference information update means includes
Calculating the difference between the ammonia injection amount calculated by the ammonia injection amount calculating means and the injection actual amount calculated by the ammonia injection actual amount calculating means;
The gas processing apparatus according to claim 1, wherein the ammonia injection reference information is updated when an increase rate of the cumulative value of absolute values of the differences exceeds a second threshold value. The ammonia injection reference information update means includes
The gas processing apparatus according to claim 1, wherein the ammonia injection reference information is updated when a time elapsed from a previous correspondence update exceeds a third threshold. The ammonia injection reference information update means includes
The gas treatment according to any one of claims 1 to 4, wherein an average value of the actual injection amount is obtained for each exhaust gas amount, and the obtained average value is used as updated ammonia injection reference information for each exhaust gas amount. apparatus. The ammonia injection reference information update means includes
In the range where the actual injection amount was not calculated,
For the exhaust gas amount smaller than the exhaust gas amount in the range in which the actual injection amount is calculated, the minimum value of the calculated actual injection amount is the updated ammonia injection reference in the range in which the actual injection amount was not calculated. Information and
For an exhaust gas amount larger than the exhaust gas amount in the calculated range of the actual injection amount, the actual actual injection amount is not calculated using the estimated actual injection amount estimated according to the increase rate in the calculated actual injection amount. The gas processing apparatus according to claim 5, wherein the ammonia injection reference information is updated in a range. A gas treatment device for reducing the concentration of acidic gas contained in the exhaust gas by injecting slaked lime with respect to the exhaust gas discharged from the waste treatment furnace,
Slaked lime injection reference information storage means for storing slaked lime injection reference information indicating a correspondence relationship between the amount of acidic gas in the exhaust gas and the amount of slaked lime injected;
Acid gas amount calculating means for calculating the amount of acid gas in the exhaust gas;
Slaked lime injection amount calculating means for calculating a slaked lime injection amount corresponding to the calculated acid gas amount based on the slaked lime injection reference information;
Correction for the calculated slaked lime injection amount, slaked lime injection amount correction means for calculating the corrected slaked lime injection amount,
Based on the slaked lime injection amount after the correction, slaked lime injection means for injecting the slaked lime,
Slaked lime injection record amount calculation means for calculating the injection record amount of the injected slaked lime;
Based on the actual injection amount, the slaked lime injection reference information update means for updating the slaked lime injection reference information,
A gas processing apparatus comprising: The slaked lime injection reference information update means,
Calculating the difference between the slaked lime injection amount calculated by the slaked lime injection amount calculating means and the injection actual amount calculated by the slaked lime injection actual amount calculating means;
The gas processing apparatus according to claim 7, wherein the slaked lime injection reference information is updated when a cumulative value of the absolute values of the differences exceeds a fourth threshold value. The slaked lime injection reference information update means,
Calculating the difference between the slaked lime injection amount calculated by the slaked lime injection amount calculating means and the injection actual amount calculated by the slaked lime injection actual amount calculating means;
The gas processing apparatus according to claim 7, wherein the slaked lime injection reference information is updated when an increase rate of the cumulative value of the absolute values of the differences exceeds a fifth threshold value. The slaked lime injection reference information update means,
The gas processing apparatus according to claim 7, wherein the slaked lime injection reference information is updated when a time elapsed from the previous correspondence update exceeds a sixth threshold. The slaked lime injection reference information update means,
The gas treatment according to any one of claims 7 to 10, wherein an average value of the actual injection amount is obtained for each exhaust gas amount, and the obtained average value is used as updated slaked lime injection reference information for each exhaust gas amount. apparatus. The slaked lime injection reference information update means,
In the range where the actual injection amount was not calculated,
For the exhaust gas amount smaller than the exhaust gas amount in the range in which the actual injection amount is calculated, the minimum value of the calculated actual injection amount is the updated slaked lime injection standard in the range in which the actual injection amount was not calculated. Information and
For an exhaust gas amount larger than the exhaust gas amount in the calculated range of the actual injection amount, the actual actual injection amount is not calculated using the estimated actual injection amount estimated according to the increase rate in the calculated actual injection amount. The gas processing apparatus according to claim 11, wherein the slaked lime injection reference information is updated in a range. A gas treatment method for reducing the concentration of NO _x contained in the exhaust gas by injecting ammonia into the exhaust gas discharged from the waste treatment furnace,
The ammonia injection reference information storage means stores ammonia injection reference information indicating a correspondence relationship between the NO _x amount and the ammonia injection amount in the exhaust gas,
_The amount of NO _x calculating means, the amount of NO _x calculating a amount of NO _x in the exhaust gas,
An ammonia injection amount calculating step in which the ammonia injection amount calculating means calculates an ammonia injection amount corresponding to the calculated NO _x amount based on the ammonia injection reference information;
An ammonia injection amount correction step for correcting the ammonia injection amount calculated by the ammonia injection amount correction means and calculating a corrected ammonia injection amount;
An ammonia injection step in which the ammonia injection means injects the ammonia based on the corrected ammonia injection amount;
Ammonia injection performance amount calculation step in which the ammonia injection performance amount calculation means calculates the actual injection amount of the injected ammonia,
Ammonia injection reference information update means updates the ammonia injection reference information based on the actual injection amount and updates the ammonia injection reference information; and
A gas processing method comprising: A gas treatment method for reducing the concentration of acidic gas contained in the exhaust gas by injecting slaked lime with respect to the exhaust gas discharged from the waste treatment furnace,
The slaked lime injection reference information storage means stores slaked lime injection reference information indicating the correspondence between the amount of acidic gas in the exhaust gas and the amount of slaked lime injected,
An acid gas amount calculating means for calculating an acid gas amount in the exhaust gas;
A slaked lime injection amount calculating step in which the slaked lime injection amount calculating means calculates the slaked lime injection amount corresponding to the calculated acid gas amount based on the slaked lime injection reference information; and
With respect to the calculated slaked lime injection amount, the slaked lime injection amount correction means performs correction, and calculates the corrected slaked lime injection amount after the correction,
A slaked lime injecting means injecting the slaked lime based on the corrected amount of slaked lime injected, and
The slaked lime injection actual amount calculation step for calculating the injection actual amount of the injected slaked lime by the slaked lime injection actual amount calculation means,
The slaked lime injection reference information update unit updates the slaked lime injection reference information based on the actual injection amount, and the slaked lime injection reference information update step;
A gas processing method comprising:

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