JP3143491U - Ash processing equipment - Google Patents

Abstract

An object of the present invention is to monitor the content of hexavalent chromium contained in incineration ash such as boilers using woody biomass containing chromium as a fuel, and to appropriately control the addition amount of a chemical that suppresses elution of hexavalent chromium. Thus, an ash treatment apparatus that can contribute to drug saving is provided.
An ash storage tank 2 having an incineration ash charging port and an incineration ash discharge port, a chemical supply means 3 and a humidified water supply means 4 are provided, and chemicals and humidified water are supplied to the incinerated ash supplied from the ash storage tank 2. A kneading machine 5 for adding and kneading, a hexavalent chromium detecting means 6 for detecting the content of hexavalent chromium in the incinerated ash, and a chemical supply amount of the chemical supplying means according to the detection result of the hexavalent chromium detecting means 6 Drug supply amount control means 7 for adjusting
[Selection] Figure 1

Description

  The present invention relates to an ash treatment apparatus for treating incineration ash of a fuel containing chromium such as biomass fuel with a chemical.

  Woody biomass is attracting attention as an energy source from the viewpoint of effective use of biomass energy. However, woody biomass sometimes contains chromium, and when burned, it is problematic that it is detected as harmful hexavalent chromium from incineration ash such as boilers.

  In order to cope with such a problem, conventionally, as one of processing apparatuses for detoxifying and stabilizing the incineration ash, an ash processing apparatus for adding a chemical to the incineration ash and detoxifying it is known.

  FIG. 2 is a system diagram showing a conventional boiler ash treatment apparatus using biomass or the like as fuel. Incinerated ash generated by combustion of woody biomass and the like is stored in the ash storage tank 100, and from the humidified water supply line 102 and the chemical supply line 103 in order to prevent scattering by the kneading machine 101 and suppression of elution of heavy metals. Are added and kneaded and stored in the ash pit 104 or the flexible container. The treated incinerated ash accommodated in the ash pit 104 or the flexible container is transported to the landfill and is landfilled.

  In the ash treatment apparatus of FIG. 2, the processing amount of the kneader 101 is set to a constant amount, and the opening degree of the valves 105 and 106 is manually adjusted for humidified water and chemicals in accordance with the processing amount of the kneader 101. Etc. are supplied quantitatively. As for the supply amount of the medicine, a supply amount sufficient for the chemical-treated residue to satisfy the environmental standard is calculated from experiments and the calculated addition amount is uniformly added.

  However, the properties of fuel such as woody biomass fuel vary, and when a uniform set amount of chemical is added, the chemical may be excessively added.

  Therefore, the present invention monitors the content of hexavalent chromium contained in incineration ash such as boilers that use wood biomass containing chromium as fuel, and adds the appropriate amount of chemicals to suppress elution of hexavalent chromium. The main object of the present invention is to provide an ash treatment apparatus that can contribute to the reduction of chemicals by controlling to the above.

  In order to achieve the above object, the present invention provides an ash treatment apparatus for detoxifying chrome-containing fuel incineration ash with chemicals, an ash storage tank having an incineration ash input port and an incineration ash discharge port, a chemical supply means, A kneader comprising humidifying water supply means, kneaded by adding chemicals and humidified water to the incinerated ash supplied from the ash storage tank, and hexavalent chromium in the incinerated ash supplied from the ash storage tank to the kneader And a drug supply amount control means for adjusting a drug supply amount of the drug supply means based on a detection result of the hexavalent chromium detection means. .

  The hexavalent chromium detecting means includes a weighing and taking-out means for weighing out a predetermined amount of incinerated ash from an ash storage tank, a stirrer for receiving the incinerated ash taken out by the weighing and taking-out means and mixing it with a solvent, and the stirrer It is preferable to have a quantitative analysis device that quantifies the elution amount of hexavalent chromium in the mixed liquid of the incinerated ash mixed with the solvent and the solvent.

  The apparatus further comprises conveying means for conveying the incinerated ash from the ash storage tank to the kneading machine, wherein the conveying means is switchable in the conveying direction, the kneading machine is disposed on one side of the conveying means in the conveying direction, and the weighing out The means is arranged on the other side of the conveying means in the conveying direction and receives and measures the incinerated ash conveyed by the conveying means, and switches the conveying direction of the conveying means based on the measurement result of the measuring tank. And a control unit for controlling.

  It is preferable that the apparatus further includes a transfer means for transferring the mixed liquid after being analyzed by the quantitative analyzer to the kneader.

  According to the present invention, the content of hexavalent chromium in the incinerated ash to be detoxified is detected, and the amount of drug supply is controlled according to the detected amount. You can save.

  A preferred embodiment of an ash treatment apparatus according to the present invention will be described with reference to FIG. In addition, about the structure similar to the past, the same code | symbol may be attached | subjected and duplication description may be abbreviate | omitted.

  As shown in FIG. 1, the ash treatment apparatus 1 includes an ash storage tank 2 having an incineration ash input port 2 a and an incineration ash discharge port 2 b, a chemical supply unit 3, and a humidified water supply unit 4, and is supplied from the ash storage unit 2. A kneader 5 for adding chemicals and humidified water to the incinerated ash to be kneaded, a hexavalent chromium detecting means 6 for detecting the content of hexavalent chromium in the incinerated ash, and detection by the hexavalent chromium detecting means 6 And a medicine supply amount control means 7 including a control device 7a for adjusting the medicine supply amount of the medicine supply means 3 based on the result.

  The ash storage tank 2 accepts and stores the incineration ash from the incineration ash input port 2a, opens the open / close valve 2c provided at the incineration ash discharge port 2b when necessary, and drops and discharges the stored incineration ash. it can. The on-off valve 2c can be opened and closed manually or by remote control.

  The incinerated ash discharged from the incinerated ash discharge port 2 b of the ash storage tank 2 falls on the conveying means 9 and is conveyed to the kneader 5 by the conveying means 9. The conveying means 9 is preferably a screw conveyor capable of quantitative conveyance. However, the conveying means 9 is not limited to a screw conveyor, and any means may be used as long as it can receive the incinerated ash falling from the incinerated ash discharge port 2b of the ash storage tank 2 and quantitatively convey it. Other transport devices can also be employed. The screw conveyor constituting the conveying means 9 can switch the conveying direction forward or backward by switching the forward / reverse rotation of the drive motor 9a, and is provided with discharge ports 9b and 9c at the front end and the rear end, respectively. ing.

  The kneading machine 5 employs a biaxial kneading extruder in the illustrated example. This type of kneader 5 is generally attached to two rotating shafts 5b (only one rotating shaft is shown in FIG. 1) arranged in parallel in the casing 5a and to be engaged with each shaft 5b. The incinerated ash discharged from the discharge port 9b of the transfer means 9 is conveyed while being kneaded received from the receiving port 5d, and pushed out to the discharge port 5e.

  A chemical supply means 3 and a humidified water supply means 4 are connected to the casing 5 a of the kneader 5. The humidified water supply means 4 includes a pipe 4b connected to the humidified water supply source 4a, and this pipe 4b is connected in the vicinity of the receiving port 5d of the casing 5a. The medicine supply means 3 includes a medicine tank 3a and a tube 3b extending from the medicine tank 3a. The tube 3b is connected to the tube 4b, and the medicine and humidified water are mixed and sent to the kneader 5. The flow rate of the humidified water is limited to a predetermined flow rate by adjusting the opening of the valve 4c interposed in the pipe 4b, and the water amount corresponding to the transport amount of the transport means 9 is supplied to the kneader 5.

  The medicine supply means 3 shown in FIG. 1 supplies a liquid medicine. However, the medicine supplied by the medicine supply means is not limited to liquid, and solid medicine can also be used. In this case, the medicine supply means is a supply means suitable for solid medicine supply, for example, a capacity screw feeder. Further, a weight type screw feeder, a vibration feeder or the like can be provided. Moreover, it is good also as a structure which supplies a chemical | medical agent directly to a kneading machine, without mixing with humidified water, before supplying a chemical | medical agent to a kneading machine.

  The hexavalent chromium detecting means 6 is a weighing extraction means 10 for weighing out a predetermined amount from the incineration ash supplied to the kneader 5 and a stirring for receiving the incineration ash taken out by the weighing extraction means 10 and mixing it with a solvent. And a quantitative analysis device 12 that quantifies the elution amount of hexavalent chromium in the mixed liquid of the incinerated ash mixed with the stirrer 11 and the solvent.

  As described above, the screw conveyor constituting the conveying means 9 can convey the incinerated ash in the direction opposite to the direction of conveying to the kneader 5 by reversing the drive motor 9a.

  The weighing-out means 10 is a weighing tank 10a that receives and measures the incinerated ash conveyed from the conveying means 9 and discharged from the discharge port 9c, and a control unit that controls switching of the drive motor 9a based on the measurement result of the weighing tank 10a. 10b.

  The measuring tank 10a includes a load cell 10c for measuring the weight of the contents in the tank. The weight measured by the load cell 10c is sent to the control unit 10b as an electrical signal. A discharge passage 10e that opens to the stirring tank 11a of the stirrer 11 is connected to the bottom of the measuring tank 10a via an on-off valve 10d. The on-off valve 10d can be an electromagnetic valve and can be remotely controlled by the control unit 10b.

  For example, when the inside of the measuring tank 10a is empty, the control unit 10b transmits a command for switching the rotation direction to the reverse direction to the drive motor 9a, whereby the conveying means 9 conveys the incinerated ash to the kneader 5. When the incineration ash is switched to the direction in which the incineration ash is transported from the transport tank 9 to the weighing tank 10a and a predetermined weight (for example, 50 g) of incineration ash is accommodated in the weighing tank 10a from the transport means 9, the rotational direction of the drive motor 9a is corrected Sends a command to switch to rotation. A predetermined weight of incineration ash accommodated in the measuring tank 10a is discharged to the stirring tank 11a through the discharge passage 10e. The control unit 10b can transmit a command to open the on-off valve 10d when the incinerated ash in the measuring tank 10a reaches a predetermined weight.

  The stirrer 11 includes a stirring tank 11a, a stirring member 11b such as a propeller, and a solvent supply unit 11c. The solvent supply means 11c includes a supply pipe 11d connected to a solvent source (not shown) and a float valve 11e. In this example, the solvent is water at room temperature and the solvent source is a water pipe, but warm water or other solvents can also be used. The float valve 11e closes the float valve 11e and stops the supply of the solvent when a predetermined amount of solvent is supplied into the stirring tank 11a from the supply pipe 11d to the incinerated ash measured in the measuring tank 10a. For example, when the incineration ash supplied from the weighing tank 10a is 50 g, when a volume (500 cc) of water (solvent) corresponding to 10 times its weight (500 g) is supplied from the supply pipe 11d to the stirring tank 11a. The float valve 11e is actuated to stop water supply from the supply pipe 11d.

  The quantitative analyzer 12 can use a quantitative analyzer based on diphenylcarbazide absorptiometry, for example, an automatic hexavalent chromium measuring device (CR-608) manufactured by Anatec Yanaco Co., Ltd. or a hexavalent manufactured by Toa DKK Corporation. A chrome monitor can be used. The quantitative analyzer 12 includes a detection unit 12a, a converter 12b, and supply units 12c and 12d that supply sulfuric acid and diphenylcarbazide solutions as reagents, respectively. Although not shown, the detection unit 12a includes a flow cell, a light source composed of a light-emitting diode, a photodetector composed of a photodiode, and the like, and a predetermined amount in a liquid to be measured (mixed liquid of solvent and incinerated ash) from which hexavalent chromium has been eluted. A sulfuric acid and diphenylcarbazide solution is added and mixed to measure the concentration of reddish purple that develops color according to the concentration of hexavalent chromium by the photoelectric colorimetric method. The detection signal of the detector 12a is A / D converted by the converter 12b and output. The output of the converter 12b is output to the control device 7a constituting the medicine supply amount control means 7.

  In addition to quantitative analyzers based on diphenylcarbazide absorptiometry, quantitative analyzers based on other analytical methods such as ion chromatograph analysis, energy dispersive X-ray fluorescence analysis, wavelength dispersive X-ray fluorescence analysis, etc. It can also be used.

  The control device 7a is interposed in the tube 3b in order to appropriately control the supply amount of the drug supplied from the drug supply means 3 to the kneader 5 according to the concentration of hexavalent chromium detected by the quantitative analyzer 12. The electromagnetic valve 7b is controlled. The control device 7a may adjust the supply amount of the medicine by controlling the opening / closing time by using an opening / closing valve for controlling the opening / closing of the flow path as the electromagnetic valve 7b, or the proportional solenoid valve may be used as the electromagnetic valve 7b. May be used to adjust the flow rate according to the detected concentration of hexavalent chromium.

  The hexavalent chromium detecting means 6 preferably quantifies a part of the incinerated ash conveyed through the conveying means 9 intermittently and continuously, for example, every 1 to 24 hours, preferably every hour. The predetermined amount of incineration ash can be controlled to be taken out from the conveying means 9 and quantified. Thereby, the detoxification process of incineration ash can be continuously performed, optimizing the addition amount of a chemical | medical agent.

  The mixed liquid after being analyzed by the quantitative analyzer 12 can be transferred to the kneader 5 by the transfer means 13. The transfer means 13 can include a transfer path 13a and a transfer pump 13b. The incineration ash taken out for quantitative analysis is, for example, 50 g per hour, which is sufficiently smaller than the conveyance amount (for example, 50 to 300 kg / hour) of the conveyance means 9. Further, the weight of water per hour added to the stirring tank 11a for quantitative analysis is, for example, about 10 times that of incinerated ash for quantitative analysis, and the supply amount of humidified water added to the kneader 5 (for example, , 5-30 kg / hour). Therefore, the amount of hexavalent chromium transferred to the kneading machine 5 by the transfer means 13 is a negligible amount with respect to the chemical supply control amount of the control device 7a, but may be controlled in consideration of the control device 7a. good.

  The incinerated ash kneaded by adding an appropriate amount of chemicals and humidified water in the kneader 5 is accommodated in the ash pit 14 or the flexible container. The treated incinerated ash accommodated in the ash pit 14 or the flexible container is transported to the landfill and is landfilled.

  Since the above embodiment of the ash treatment apparatus according to the present invention has the above-described configuration, an appropriate amount of chemical is supplied to the incinerated ash to be detoxified, so that there is no excess or deficiency. Therefore, the drug can be saved as compared with the conventional method.

  The above-described embodiment is an example showing the best mode for carrying out the present invention, and various changes and combinations can be made without departing from the spirit of the present invention.

  For example, by omitting the conveying means, it is possible to adopt a configuration in which the incinerated ash in the ash storage tank is directly administered from the ash storage tank to the kneader without using the conveying means. A configuration in which a predetermined amount of incinerated ash is taken out from the storage tank, the content of hexavalent chromium is detected, and the chemical supply amount is controlled according to the detected value.

  Further, for example, a kneader without an extrusion function can be used for the kneader. In that case, the incinerated ash after the chemical treatment is taken out from the kneader in a batch manner and is subjected to a landfill process.

1 is a system diagram showing an embodiment of an ash treatment apparatus according to the present invention. It is a system diagram which shows the conventional ash processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ash processing apparatus 2 Ash storage tank 3 Chemical supply means 4 Humidified water supply means 5 Kneading machine 6 Hexavalent chromium detection means 7 Chemical supply amount control means 9 Conveyance means 10 Weighing extraction device 11 Stirrer 12 Quantitative analysis device 13 Transfer means

Claims (4)

An ash treatment device that detoxifies the incineration ash of chromium-containing fuel with chemicals,
An ash storage tank with an incineration ash inlet and an incineration ash outlet;
A kneader comprising a chemical supply means and a humidified water supply means, and kneading the chemical and humidified water added to the incinerated ash supplied from the ash storage tank;
Hexavalent chromium detecting means for detecting the content of hexavalent chromium in the incinerated ash supplied from the ash storage tank to the kneader;
A medicine supply amount control means for adjusting the medicine supply amount of the medicine supply means according to the detection result of the hexavalent chromium detection means;
An ash treatment apparatus characterized by comprising: The hexavalent chromium detecting means includes
A weighing-out means for weighing out a predetermined amount of incinerated ash from the ash storage tank;
A stirrer that receives the incinerated ash taken out by the metering means and mixes it with a solvent;
A quantitative analyzer for quantifying the elution amount of hexavalent chromium in the mixed liquid of incinerated ash mixed with the stirrer and a solvent;
The ash treatment apparatus according to claim 1, comprising: Further comprising conveying means for conveying the incinerated ash from the ash storage tank to the kneader,
The transport means can switch the transport direction,
The kneader is disposed on one side of the conveying means in the conveying direction;
The weighing-out means is arranged on the other side in the conveying direction of the conveying means, receives a weighing tank that receives the incinerated ash conveyed by the conveying means, and conveys the conveying means based on the measurement result of the measuring tank. A control unit for controlling direction switching;
The ash treatment apparatus according to claim 2, comprising: The ash treatment apparatus according to claim 2, further comprising a transfer unit that transfers the mixed liquid after being analyzed by the quantitative analysis apparatus to the kneader.

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