JP6057445B1 - Waste incinerator exhaust gas treatment method and waste incinerator exhaust gas treatment equipment - Google Patents

Abstract

A precoat layer is formed on a filter cloth of a filter type dust collector 3 by supplying chemicals for neutralizing acid gas in the filter type dust collector 3 of exhaust gas discharged from a waste incinerator 1 In the waste incinerator exhaust gas treatment method, it is possible to ensure the desired purification capacity by the filtration dust collector 3 without using more than necessary chemicals. A waste incinerator exhaust gas treatment method includes a process of continuously measuring the amount of exhaust gas and the concentration of acid gas in the exhaust gas at the inlet side of the filtration dust collector 3, and the concentration of the acid gas thus measured. Based on the amount of exhaust gas, a process for estimating the optimum amount of medicine for a predetermined time to be supplied to the filtration dust collector 3, and the medicine corresponding to the estimated supply amount is collectively supplied to the filtration dust collector 3. Process. [Selection] Figure 1

Description

  The present invention provides a precoat layer on the filter cloth of the filtration dust collector by supplying a chemical for neutralizing acid gas in the filtration dust collector for purifying the exhaust gas discharged from the waste incinerator. The present invention relates to a waste incinerator exhaust gas treatment method and a waste incinerator exhaust gas treatment facility.

  The exhaust gas discharged from the waste incinerator contains harmful acidic gases such as hydrogen chloride (HCl) and sulfur oxide (SOx) depending on the type of garbage to be incinerated.

  Conventionally, after the exhaust gas discharged from the waste incinerator is reduced in temperature to 200 ° C. or less, the exhaust gas is passed through a filtration type dust collector to remove acid gas in the exhaust gas, and then from the chimney to the atmosphere. To be discharged. A chemical (for example, slaked lime) for neutralizing the acidic gas is supplied to the filtration dust collector.

  For example, in Patent Document 1, the pressure difference between the inlet side and the outlet side of the filtration type dust collector and the acid harmful gas concentration on the outlet side are measured, and the thickness of the adhesion layer is estimated from the differential pressure, and the difference When the pressure reaches the set value, the adhesion layer is removed, and the effective layer thickness of the unreacted drug is estimated from the acid noxious gas concentration on the outlet side, and based on the acid noxious gas concentration when the adhesion layer is eliminated. The next medicine spray amount is corrected.

Japanese Patent No. 2518576

  In Patent Document 1, it is said that the effective layer thickness of the unreacted drug is estimated from the acid noxious gas concentration on the bag filter outlet side, but the dust is not uniform and the acid gas concentration generated by incineration is not constant. Because the acid gas concentration on the bag filter outlet side also changes due to the change of the acid gas concentration on the bag filter inlet side, the error becomes large even if the amount of unreacted drug is estimated, and it is necessary to supply the drug excessively . Therefore, the running cost increases.

  In addition, if an excessive amount of medicine is supplied as described above, the spray attached to the filter cloth of the filtration dust collector before the medicine completely reacts in the filtration dust collector. Ash may increase the differential pressure between the inlet side and the outlet side of the filtration dust collector.

  In that case, it is necessary to perform a process of removing the filter cloth of the filtration dust collector. In this process, deposits on the surface of the filter cloth are removed with the unreacted chemical remaining in the filtration dust collector.

  That is, when the supply amount of the medicine is set excessively, a loss occurs in operation time, for example, it is necessary to perform the withdrawal process at a relatively early stage.

  In view of such circumstances, the present invention provides the filtration dust collector by supplying a chemical for neutralizing acid gas in a filtration dust collector for purifying exhaust gas discharged from a waste incinerator. In the waste incinerator exhaust gas treatment method in which a precoat layer is formed on the filter cloth, it is an object of the present invention to ensure the desired purification ability by the filtration dust collector without using more than necessary chemicals. The present invention also provides a precoat on the filter cloth of the filtration dust collector by supplying a chemical for neutralizing acid gas in the filtration dust collector for purifying the exhaust gas discharged from the waste incinerator. In the waste incinerator exhaust gas treatment facility for forming a layer, it is an object to be able to ensure the desired purification ability by the filtration dust collector without using an excessive amount of chemicals.

  The present invention provides a precoat layer on the filter cloth of the filtration dust collector by supplying a chemical for neutralizing acid gas in the filtration dust collector for purifying the exhaust gas discharged from the waste incinerator. A waste incinerator exhaust gas treatment method to be formed, the measurement processing for continuously measuring the amount of exhaust gas and the concentration of acidic gas in the exhaust gas at the inlet side of the filtration dust collector, and the concentration of the measured acidic gas And an estimation process for estimating an optimal amount of the medicine for a predetermined time to be supplied to the filtration dust collector based on the exhaust gas amount, and a medicine corresponding to the estimation result is supplied to the filtration dust collector together And supply processing.

  In this configuration, in the pre-coating method, the optimum amount of medicine for a predetermined time to be supplied into the filtration dust collector is determined from the amount of exhaust gas flowing into the filtration dust collector and the concentration of acidic gas in the exhaust gas. Thus, the optimum amount of the chemical is collectively supplied into the filtration dust collector.

  As a result, there is no waste of excessive supply of the medicine as in the conventional example, so that the running cost can be reduced.

  By the way, in the waste incinerator exhaust gas treatment method, after performing the supply treatment, the filtration type collection is performed based on the continuously measured exhaust gas amount and the continuously measured acid gas concentration. A first determination process for estimating the remaining amount of the medicine in the dust apparatus and determining whether or not the estimation result is equal to or less than a set value; and after performing the supply process, the outlet side of the filtration dust collector In step 2, after measuring the concentration of acid gas in the exhaust gas and determining whether the measurement result is equal to or higher than a set value, and after performing the supply process, the inlet side of the filtration dust collector Affirmative in any one of the third determination process for determining whether or not the calculation result is equal to or greater than a set value, and the first, second, and third determination processes A wipe-off to clean the filter cloth of the filtration dust collector when judged Process and it is possible to make further performed.

  In this case, it is possible to perform the removal in a state where there is as little chemical as possible on the filter cloth of the filtration type dust collector. Thereby, since it becomes possible to avoid using a medicine wastefully, it can contribute to reduction of running cost.

Further, the concentration measurement of acid gases in the measurement process, using the analyzer of laser type, wherein the measurement of the quantity of exhaust gas in the measurement process, Ru with pitot tube, it is possible. In this case, the amount of exhaust gas and the concentration of acid gas ( such as hydrogen chloride ) in the exhaust gas can be continuously measured in non-contact and in real time, so the optimum amount of chemicals to be supplied to the filtration dust collector The estimation accuracy of can be improved. Thereby, it becomes possible to avoid using the medicine wastefully. In addition, since it becomes possible to perform fine control regarding the supply of the medicine, further saving of the medicine becomes possible.

  The present invention provides a precoat layer on the filter cloth of the filtration dust collector by supplying a chemical for neutralizing acid gas in the filtration dust collector for purifying the exhaust gas discharged from the waste incinerator. A waste incinerator exhaust gas treatment facility to be formed, having a control unit that controls an operation for forming the precoat layer, wherein the control unit includes an exhaust gas amount and the exhaust gas at an inlet side of the filtration dust collector Optimum of the medicine for a predetermined time to be supplied to the filtration dust collector based on the measuring means for continuously measuring the concentration of acid gas in the inside, and the measured concentration of acid gas and the amount of exhaust gas It is characterized by including an estimation means for performing a process for estimating the amount, and a supply means for performing a process of collectively supplying the chemicals corresponding to the estimation result to the filtration dust collector.

  In this configuration, in the pre-coating method, the optimum amount of medicine for a predetermined time to be supplied into the filtration dust collector is determined from the amount of exhaust gas flowing into the filtration dust collector and the concentration of acidic gas in the exhaust gas. Thus, the optimum amount of the chemical is collectively supplied into the filtration dust collector.

  As a result, there is no waste of excessive supply of the medicine as in the conventional example, so that the running cost can be reduced.

  By the way, after the processing of the supply means, the control unit performs the filtration dust collector based on the continuously measured exhaust gas amount and the continuously measured acid gas concentration. A first determination unit that performs a process of estimating a remaining amount of the medicine in the inside and determines whether or not the estimation result is equal to or greater than a set value; and after performing the process of the supply unit, the filtration dust collector After measuring the concentration of the acidic gas in the exhaust gas on the outlet side of the gas, and performing a process of determining whether the measurement result is equal to or higher than a set value, and the process of the supply unit, A third determination means for calculating a differential pressure between the inlet side and the outlet side of the filtration dust collector, and determining whether or not the calculation result is equal to or greater than a set value; and the first, second, When the affirmative determination is made by any one of the third determination means, the filtration And 払落 and means for performing a process of cleaning a filter cloth of a dust collector, it is possible to further comprises configure.

  In this case, it is possible to perform the removal in a state where there is as little chemical as possible on the filter cloth of the filtration type dust collector. Thereby, since it becomes possible to avoid using a medicine wastefully, it can contribute to reduction of running cost.

Further, wherein the concentration measurement of the acid gases in the measuring means, using the analyzer of laser type, wherein the measurement of the quantity of exhaust gas in the measurement process, Ru with pitot tube, it is possible. In this case, the amount of exhaust gas and the concentration of acid gas ( such as hydrogen chloride ) in the exhaust gas can be continuously measured in non-contact and in real time, so the optimum amount of chemicals to be supplied to the filtration dust collector The estimation accuracy of can be improved. Thereby, it becomes possible to avoid using the medicine wastefully. In addition, since it becomes possible to perform fine control regarding the supply of the medicine, further saving of the medicine becomes possible. In this case, the amount of exhaust gas and the concentration of acidic gas in the exhaust gas can be continuously measured in a non-contact and real time manner.

  According to the waste incinerator exhaust gas treatment method according to the present invention, it is possible to ensure the desired purification ability by the filtration dust collector without using more than necessary chemicals.

It is a figure which shows typically the structure of one Embodiment of the waste incinerator waste gas processing equipment which concerns on this invention. It is a figure which shows the flowchart for demonstrating the waste gas processing method using the incinerator waste gas processing equipment of FIG.

  BEST MODE FOR CARRYING OUT THE INVENTION Best modes for carrying out the present invention will be described in detail below with reference to the accompanying drawings.

  1 and 2 show an embodiment of the present invention. The waste incinerator exhaust gas treatment facility in the illustrated example includes a waste incinerator 1, a cooling device 2, a filtering dust collector 3 such as a bag filter, an induction fan 4, a chimney 5, a chemical supply device 6, a removal device 7, a control Part 10, first, second and third sensors 11, 12, 13 and the like.

  The garbage incinerator 1 burns garbage such as industrial waste (not shown) or infectious medical waste put in a predetermined package, and the type of the incinerator is not limited.

  Although the cooling device 2 is not illustrated in detail, the boiler that lowers the high-temperature exhaust gas discharged from the waste incinerator 1 to, for example, about 220 ° C., or the exhaust gas cooled by the cooling device 2 is further reduced to approximately 200 ° C. or less. It has a cooling tower that reduces the temperature.

  The filtration type dust collector 3 neutralizes, filters, and purifies dust and harmful gas components in the exhaust gas reduced in temperature by the cooling device 2.

  The induction ventilator 4 sucks the exhaust gas in the filtration dust collector 3 and releases it from the chimney 5 to the atmosphere.

  The chemical supply device 6 supplies chemicals for a predetermined filtration time to the filtration dust collector 3 and includes a tank 61, a blower 62, a carry-out device 63, and the like.

  The tank 61 stores a chemical for neutralizing the acid gas in the exhaust gas. The blower 62 generates carrier air for supplying the medicine in the tank 61 to the inlet side of the filtration dust collector 3. The carry-out device 63 cuts out the medicine from the medicine discharge port of the tank 61.

  The dust-off device 7 cleans a filter cloth (not shown) in the filtration dust collector 3, and includes a compressed air supply source 71, a valve 72, and the like.

  The compressed air supply source 71 generates compressed air used for cleaning the filter cloth in the filtration type dust collector 3. The valve 72 controls the amount by which the compressed air generated by the compressed air supply source 71 can be supplied to the filtering dust collector 3.

  The control unit 10 will be described in detail later, but when the pre-coating process needs to be performed after a predetermined time elapses in the filtering operation time of the filtering dust collector 3, After performing the removal process for cleaning the filter cloth, the precoat process for forming a precoat layer made of a chemical for neutralizing the acid gas on the filter cloth in the filtration dust collector 3 is performed.

  The first sensor 11 continuously measures the concentration of acidic gas in the exhaust gas on the inlet side of the filtration dust collector 3.

  The second sensor 12 continuously measures the amount of exhaust gas at the outlet side of the filtration dust collector 3. It can be said that the output of the second sensor 12 is equivalent to measuring the amount of exhaust gas at the inlet side of the filtration dust collector 3.

  The third sensor 13 continuously measures the concentration of acidic gas in the exhaust gas at the outlet side of the filtration type dust collector 3.

  The first sensor 11 and the third sensor 13 are, for example, known laser analyzers. The second sensor 12 is, for example, a known Pitot tube.

  Next, an exhaust gas treatment method using the waste incinerator exhaust gas treatment facility according to this embodiment will be described with reference to FIG.

  During the operation of incineration, after the filtration operation by the filtration dust collector 3 is performed for a predetermined time, the filter cloth of the filtration dust collector 3 is cleaned, a precoat layer is formed on the filter cloth, and the filtration is performed again. The cycle of returning to driving is repeated.

  Here, during the filtration operation, the first, second, and third determination processes shown in steps S1, S2, and S3 are performed, and when an affirmative determination is made in any one of these determination processes, in step S4, A removal process for cleaning the filter cloth of the filtration dust collector 3 by the removal apparatus 7 is performed.

  The first determination process is based on the amount of exhaust gas continuously measured by the second sensor 12 and the concentration of the acidic gas continuously measured by the first sensor 11. The remaining amount of the medicine is estimated, and it is determined whether or not the estimation result is equal to or less than the set value X.

  In the second determination process, the concentration of the acidic gas in the exhaust gas on the outlet side of the filtration dust collector 3 is measured by the third sensor 13, and it is determined whether or not the measurement result is equal to or greater than the set value Y.

  In the third determination process, a differential pressure between the inlet side and the outlet side of the filtration dust collector 3 is calculated, and it is determined whether or not the calculation result is equal to or greater than a set value Z.

  In this embodiment, first, a second determination process is performed when a negative determination is made in the first determination process, a third determination process is performed when a negative determination is made in the second determination process, and a negative determination is made in the third determination process. In this case, the process returns to the first determination process. However, the first to third determination processes can also be performed in parallel.

  The removal process is performed when the control unit 10 operates, for example, the compressed air supply source 71 and the valve 72.

  Specifically, in the removal process, for example, the valve 72 is opened and closed at a predetermined timing and the compressed air supply source 71 is operated for a predetermined time, whereby the compressed air is jet-jetted into the filtration dust collector 3 in a pulsed manner. Then, the deposits on the surface of the filter cloth in the filtration type dust collector 3 are removed.

  After executing the payout process, the process proceeds to the precoat process shown in steps S5 to S8 below.

  That is, first, in step S5, the amount of exhaust gas and the acidic gas (hydrogen chloride, sulfur oxide) in the exhaust gas on the inlet side of the filtration dust collector 3 based on the outputs from the first and second sensors 11 and 12 The measurement process which measures the density | concentration of is continuously performed.

  Thereafter, in step S6, an estimation process is performed for estimating an optimal amount of medicine for a predetermined time to be supplied to the filtration dust collector 3 based on the measured concentration of acid gas and the amount of exhaust gas. The optimal amount of drug for the predetermined time is the optimal amount of drug required for one cycle of filtration operation time.

  Next, in steps S7 and S8, a supply process is performed in which the medicine according to the estimated result is collectively supplied to the filtration dust collector 3 by the medicine supply device 6. In this supply process, the control unit 10 operates, for example, by operating the blower 62 and the carry-out device 63 for a predetermined time (several minutes to several tens of minutes).

  Here, when the supply process ends, that is, when an affirmative determination is made in step S8, the process returns to step S1.

  By the way, if the affirmative determination is made in the third determination process in step S3 and the process proceeds to the precoat process in steps S5 to S8 after executing the payout process in step S4, the steps S7 and S8 are performed. The supply amount of the medicine in the supply process can be set to the amount of the medicine consumed between the execution of the previous precoat process and immediately before the drop-off process.

  However, on the condition that the affirmative determination is made in the first determination process in step S1 and the second determination process in step S2, the payout process in step S4 is executed, and then the process proceeds to the precoat process in steps S5 to S8. In this case, it is possible to set the medicine supply amount in the supply processing in steps S7 and S8 to be the same as the medicine supply amount set in the previous precoat process (steps S5 and S6).

  Here, the correspondence between the items described in this embodiment and the items described in the claims will be described. The step S5 is “measurement means” described in the claims, the step S6 is “estimation means” described in the claims, the steps S7 and S8 are “supply means” described in the claims, Step S1 is “first determination means” described in the claims, step S2 is “second determination means” described in the claims, and step S3 is “third determination means” described in the claims. Step S4 corresponds to the “pay-off means” described in the claims.

  As described above, according to the embodiment to which the present invention is applied, in the precoat method, from the amount of exhaust gas flowing into the filtration dust collector 3 and the concentration of acidic gas (hydrogen chloride, sulfur oxide) in the exhaust gas. Then, the optimum amount of medicine to be supplied into the filtration dust collector 3 (the optimum amount of medicine required for one cycle of filtration operation time) is examined, and the optimum amount of medicine is collected in the filtration dust collector 3. I am trying to supply.

  As a result, there is no waste of excessive supply of the medicine as in the conventional example, so that the running cost can be reduced.

  In addition, the removal process can be performed in a state where as little unreacted drug remains on the filter cloth of the filtration dust collector 3. From these things, since it becomes possible to avoid using a chemical | medical agent wastefully, it can contribute to reduction of a running cost.

  In particular, in the above-described embodiment, the amount of exhaust gas is measured by the second sensor 12 made of a Pitot tube, and the concentration of acid gas in the exhaust gas is made by the first and third sensors 11 and 13 made of laser analyzers. And since it measures continuously in real time, it becomes possible to raise the estimation precision of the optimal quantity of the chemical | medical agent which should be supplied to the filtration type dust collector 3. FIG. Thereby, it becomes possible to avoid using the medicine wastefully. In addition, since it becomes possible to perform fine control regarding the supply of the medicine, further saving of the medicine becomes possible. In addition, since the thickness of the adhesion layer to the filter cloth is properly maintained, it is not necessary to excessively increase the pressure to drop off, thereby extending the life of the filter cloth.

  In addition, this invention is not limited only to the said embodiment, It can change suitably in the range equivalent to the claim and the said range.

  In the said embodiment, although hydrogen chloride and a sulfur oxide are mentioned as an example as acidic gas used as the said measuring object, this invention is not limited only to this.

  For example, although not shown, since sulfur oxides may not be generated depending on the type of garbage to be incinerated, it is possible to use only hydrogen chloride as the acid gas to be measured.

  The present invention provides a precoat layer on the filter cloth of the filtration dust collector by supplying a chemical for neutralizing acid gas in the filtration dust collector for purifying the exhaust gas discharged from the waste incinerator. It can be suitably used for the waste incinerator exhaust gas treatment method to be formed and the waste incinerator exhaust gas treatment equipment.

1 Waste incinerator
2 Cooling device
3 Filtration type dust collector
4 induction fans
5 Chimney
6 Drug supply device
61 tanks
62 Blower
63 Unloading device
7 withdrawal device
71 Compressed air supply source
72 valve 10 control unit 11 first sensor 12 second sensor 13 third sensor

Claims (6)

Waste incineration that forms a precoat layer on the filter cloth of the filtration dust collector by supplying chemicals to neutralize acid gas in the filtration dust collector that purifies the exhaust gas discharged from the waste incinerator A furnace exhaust gas treatment method,
Measurement processing for continuously measuring the amount of exhaust gas and the concentration of acid gas in the exhaust gas at the inlet side of the filtration dust collector,
An estimation process for estimating an optimal amount of medicine for a predetermined time to be supplied to the filtration dust collector based on the measured concentration of acid gas and the amount of exhaust gas;
A waste incinerator exhaust gas treatment method comprising: supplying a chemical according to the estimation result collectively to the filtration dust collector. In the waste incinerator exhaust gas treatment method according to claim 1,
After performing the supply process, the remaining amount of the drug in the filtration dust collector is estimated based on the continuously measured exhaust gas amount and the continuously measured acid gas concentration. A first determination process for determining whether or not the estimation result is equal to or less than a set value;
After performing the supply process, measuring the concentration of the acidic gas in the exhaust gas on the outlet side of the filtration dust collector, a second determination process for determining whether the measurement result is equal to or higher than a set value;
After performing the supply process, calculate a differential pressure between the inlet side and the outlet side of the filtration dust collector, a third determination process to determine whether the calculation result is equal to or greater than a set value;
The waste incineration further comprising a removal process for cleaning a filter cloth of the filtration dust collector when an affirmative determination is made in any one of the first, second, and third determination processes. Furnace exhaust gas treatment method. In the waste incinerator exhaust gas treatment method according to claim 1 or 2,
The measured concentration measurement of acid gas in the processing, using the analyzer of laser type, wherein the measurement of the quantity of exhaust gas in the measurement process, Ru with pitot tube, waste incinerator exhaust gas treatment method characterized by . Waste incineration that forms a precoat layer on the filter cloth of the filtration dust collector by supplying chemicals to neutralize acid gas in the filtration dust collector that purifies the exhaust gas discharged from the waste incinerator Furnace exhaust gas treatment equipment,
A control unit for controlling an operation for forming the precoat layer;
The controller is
Measuring means for performing a process of continuously measuring the amount of exhaust gas and the concentration of acidic gas in the exhaust gas on the inlet side of the filtration dust collector;
Estimating means for performing a process of estimating an optimum amount of medicine for a predetermined time to be supplied to the filtration dust collector based on the measured concentration of acid gas and the amount of exhaust gas;
A waste incinerator exhaust gas treatment facility, comprising: supply means for performing a process of collectively supplying chemicals according to the estimation result to the filtration dust collector. In the waste incinerator exhaust gas treatment facility according to claim 4,
The controller is
After processing the supply means, based on the continuously measured exhaust gas amount and the continuously measured acid gas concentration, the remaining amount of the drug in the filtration dust collector is determined. First determining means for performing a process of estimating and determining whether or not the estimation result is equal to or greater than a set value;
After performing the process of the supply means, the concentration of the acidic gas in the exhaust gas is measured on the outlet side of the filtration dust collector, and the process of determining whether or not the measurement result is equal to or higher than a set value is performed. 2 determination means;
After performing the process of the supply means, a differential pressure between the inlet side and the outlet side of the filtration type dust collector is calculated, and a process of determining whether or not the calculation result is a set value or more is performed. A determination means;
A draining means for performing a process of cleaning the filter cloth of the filtration type dust collector when an affirmative determination is made by any one of the first, second, and third determination means, Waste incinerator exhaust gas treatment equipment. In the waste incinerator exhaust gas treatment facility according to claim 4 or 5,
The measured concentration measurement of acid gas in the processing, using the analyzer of laser type, wherein the measurement of the quantity of exhaust gas in the measurement process, Ru with pitot tube, waste incinerator exhaust gas treatment system, characterized in that .

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