Automatic heavy metal concentration measuring device and automatic chelating agent addition device

Abstract

The present invention provides an automatic heavy metal concentration measuring device and an automatic chelating agent addition device that can improve the stability of sampling operations compared to conventional devices. [Solution] The system comprises a sampling unit that collects ash passing through an ash channel and a measuring unit that measures the heavy metal concentration of the ash collected by the sampling unit. The sampling unit collects ash by rotating a sampling plate.

Description

Technical Field

[0001] The present invention relates to an automatic heavy metal concentration measuring device and an automatic chelating agent adding device.

Background Art

[0002] Patent Document 1 below discloses a heavy metal concentration measuring device. In this heavy metal concentration measuring device, a sampling fly ash receiving part in a horizontal posture is provided on a movable support that can move horizontally, and the movable support is projected into a fly ash transfer pipeline to attach fly ash onto the sampling fly ash receiving part. Then, the concentration of heavy metals contained in the fly ash attached to the ash receiving part is measured using X-rays.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above heavy metal concentration measuring device, there is a risk of biting in fly ash when pulling out the movable support from the fly ash transfer pipeline. And in this heavy metal concentration measuring device, there is a problem that the stability of the sampling operation may decrease due to the biting in of the fly ash.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide an automatic heavy metal concentration measuring device and an automatic chelating agent adding device capable of improving the stability of the sampling operation more than before.

Means for Solving the Problems

[0006] To achieve the above objective, the present invention provides a first solution relating to an automatic heavy metal concentration measuring device, comprising a sampling unit for collecting ash passing through an ash flow path, and a measuring unit for measuring the heavy metal concentration of the ash collected by the sampling unit, wherein the sampling unit collects ash by rotating a sampling plate.

[0007] In the present invention, as a second solution relating to an automatic heavy metal concentration measuring device, in the first solution described above, the sampling plate is a movable plate with a rotating shaft provided at the end of the ash flow path, and the ash is collected by rotating it around the rotating shaft.

[0008] In the present invention, as a third solution relating to an automatic heavy metal concentration measuring device, the means adopted is that, in the first or second solution described above, the sampling plate is a rotary valve that rotates around the rotation axis.

[0009] In the present invention, as a fourth solution relating to an automatic heavy metal concentration measuring device, in any of the first to third solutions described above, the sampling plate employs the means of supplying the collected ash to a branch channel that branches off from the main channel of the ash channel.

[0010] In the present invention, as a fifth solution relating to an automatic heavy metal concentration measuring device, the fourth solution described above employs the method of providing a restricting plate in the branch channel that restricts the passage of the collected ash.

[0011] In the present invention, as a sixth solution relating to an automatic heavy metal concentration measuring device, in any of the first to fifth solutions described above, the measuring unit employs a method in which it irradiates the collected ash with X-rays through an X-ray transmission window and measures the heavy metal concentration based on the fluorescent X-rays excited by the irradiation of the X-rays.

[0012] Furthermore, in the present invention, as a solution relating to an automatic chelating agent addition device, the present invention adopts a means comprising: a heavy metal concentration relating to any of the first to sixth solutions; an addition device for adding a chelating agent to ash; and a control device that acquires a measurement signal indicating the heavy metal concentration of the ash by controlling the automatic heavy metal concentration measuring device, and controls the addition device based on the measurement signal. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide an automatic heavy metal concentration measuring device and an automatic chelating agent adding device that can improve the stability of sampling operations compared to conventional methods. [Brief explanation of the drawing]

[0014] [Figure 1] This is a block diagram showing the overall configuration of an automatic chelating agent addition apparatus according to the first embodiment of the present invention. [Figure 2] This is a vertical cross-sectional view showing the configuration of an automatic heavy metal concentration measuring device according to the first embodiment of the present invention. [Figure 3] These are a front view and a side view showing the X-ray transmission window in the first embodiment of the present invention. [Figure 4] This is a vertical cross-sectional view showing the configuration of an automatic heavy metal concentration measuring device according to a second embodiment of the present invention. [Figure 5] This is a vertical cross-sectional view showing the configuration of an automatic heavy metal concentration measuring device according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0015] Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] First, a first embodiment of the present invention will be described with reference to Figures 1 to 3. The automatic chelating agent addition device A according to the first embodiment comprises an automatic heavy metal concentration measuring device 1, a control device 2, and an addition device 3, as shown in Figure 1. That is, this automatic chelating agent addition device A is a composite device that includes the automatic heavy metal concentration measuring device 1 according to this embodiment as a component.

[0016] Such a chelating agent automatic addition device A is for appropriately treating heavy metals by adding an appropriate amount of chelating agent to ash containing heavy metals such as lead, copper, cadmium, chromium, etc. The above ash is, for example, incineration ash generated in a waste incinerator. More specifically, the ash in this embodiment is fly ash or main ash, which is a form of incineration ash.

[0017] The heavy metal concentration automatic measurement device 1 is a measurement device that measures the concentration of heavy metals (heavy metal concentration) contained in the above ash, and outputs a measurement signal S indicating the heavy metal concentration to the control device 2. As shown in FIG. 2, this heavy metal concentration automatic measurement device 1 is provided in the ash flow path W and includes a rotary valve 1a and a measurement unit 1b. The rotary valve 1a in the first embodiment corresponds to the sampling unit of the present invention.

[0018] The ash flow path W is a pipe provided in a vertical posture as shown in the figure and having a predetermined internal area. In this ash flow path W, ash D passes from above to below in the internal space. That is, the internal space of the ash flow path W is an ash passage region through which ash D passes from above to below.

[0019] The rotary valve 1a is a rotating plate (movable plate) provided with a rotating shaft R at the end of the ash flow path W, and collects ash D by rotating (rotating) around the rotating shaft R. The rotating shaft R is provided in a horizontal posture at the end of the ash flow path W. The rotary valve 1a is supported at the end of the ash flow path W via such a rotating shaft R, and collects a part of the ash D passing from above to below as sampling ash by rotating in the direction indicated by the arrow. Such a rotary valve 1a is the sampling plate in the first embodiment.

[0020] The measurement unit 1b measures the concentration of heavy metal components (heavy metal concentration) contained in the collected ash, and outputs a measurement signal S indicating the heavy metal concentration to the control device 2. This measurement unit 1b irradiates the collected ash with X-rays through the X-ray transmission window 1c shown in FIG. 3, and acquires the heavy metal concentration by detecting the fluorescent X-rays obtained by exciting the X-rays with the heavy metal components in the collected ash.

[0021] As shown in FIG. 3, the X-ray transmission window 1c is formed by fixing an X-ray transmission film 1d to the ash flow path W through a pair of flanges 1e and 1f. The X-ray transmission film 1d is disposed in an opening formed in the ash flow path W while being sandwiched between the pair of flanges 1e and 1f, and is fixed to the opening of the ash flow path W by connecting the pair of flanges 1e and 1f with a plurality of bolts 1g. The X-ray transmission film 1d is formed of a material having X-ray transmission performance, for example, a resin material.

[0022] The control device 2 controls the heavy metal concentration automatic measurement device 1 and the addition device 3. That is, this control device 2 controls the operation of the heavy metal concentration automatic measurement device 1 by generating a sampling signal Ks and outputting it to the heavy metal concentration automatic measurement device 1. The sampling signal Ks is a control signal that instructs the rotation of the rotary valve 1a and the operation of the measurement unit 1b to the heavy metal concentration automatic measurement device 1.

[0023] Also, this control device 2 controls the operation of the addition device 3 by generating an addition signal K and outputting it to the addition device 3. The addition signal K is a control signal that instructs the addition device 3 to add the chelating agent to the ash D.

[0024] The addition device 3 adds a chelating agent to the ash D based on the addition signal K input from the control device 2. This addition device 3 is provided on the downstream side of the heavy metal concentration automatic measurement device 1 in the ash flow path W, and adds an amount of chelating agent corresponding to the addition signal K input from the control device 2 to the ash D.

[0025] Next, the operation of the chelating agent automatic addition device A according to the present embodiment, particularly the operation of the heavy metal concentration automatic measurement device 1, will be described in detail.

[0026] In the automatic chelating agent addition device A according to this embodiment, the automatic heavy metal concentration measuring device 1 measures the heavy metal concentration of the ash D as it passes sequentially through the ash flow path W from top to bottom at predetermined timings. That is, the control device 2 outputs a sampling signal Ks to the automatic heavy metal concentration measuring device 1 at predetermined timings.

[0027] As a result, in the heavy metal concentration automatic measuring device 1, the rotary valve 1a rotates based on the sampling signal Ks, collecting a portion of the ash D passing through the ash flow path W from top to bottom as sampled ash. The measuring unit 1b irradiates this sampled ash with X-rays through the X-ray transmission window 1c, and obtains fluorescent X-rays excited by the heavy metal components in the sampled ash. It is desirable to temporarily stop the rotary valve when there is ash near the measuring unit 1b and then perform X-ray irradiation.

[0028] The intensity of the fluorescent X-rays indicates the concentration of heavy metals (heavy metal concentration) contained in the collected ash (ash D). The automatic heavy metal concentration measuring device 1 generates a measurement signal S indicating the heavy metal concentration based on the fluorescent X-rays and outputs this measurement signal S to the control device 2. The control device 2 generates an addition signal K based on this measurement signal S and outputs it to the addition device 3.

[0029] The additive device 3 adds chelating agent to the ash D based on the addition signal K input from the control device 2. In other words, an appropriate amount of chelating agent is added to the ash D according to the concentration of heavy metals it contains, that is, an amount of chelating agent that is sufficient to process the heavy metals.

[0030] Here, the collected ash (ash D) whose heavy metal concentration has been measured in the automatic heavy metal concentration measuring device 1 is rotated again after the measurement of the heavy metal concentration is completed, and returned to the ash flow path W as the rotary valve 1a rotates. In other words, the ash D (collected ash) collected by the rotary valve 1a is transported into the ash flow path W by further rotation of the rotary valve 1a, and is detached from the rotary valve 1a by gravity.

[0031] The heavy metal concentration automatic measuring device 1 according to this first embodiment includes a rotary valve 1a (sampling plate) and a measuring unit 1b, and by rotating the rotary valve 1a (movable plate, sampling plate), ash D is collected as collected ash.

[0032] According to this first embodiment, since ash D is collected by rotating the rotary valve 1a (movable plate, sampling plate), it is possible to provide an automatic heavy metal concentration measuring device 1 that can improve the stability of the sampling operation compared to conventional devices.

[0033] Furthermore, the automatic chelating agent addition device A according to the first embodiment comprises an automatic heavy metal concentration measuring device 1 according to the first embodiment, an addition device 3 for adding a chelating agent to ash, and a control device 2 that acquires a measurement signal S indicating the heavy metal concentration of ash D by controlling the automatic heavy metal concentration measuring device 1, and controls the addition device 3 based on the measurement signal S.

[0034] According to this first embodiment, since ash D is collected by rotating the rotary valve 1a (sampling plate), it is possible to provide an automatic rate material adding device A that can improve the stability of sampling compared to conventional devices.

[0035] [Second Embodiment] Next, a second embodiment of the present invention will be described with reference to Figure 4. The automatic chelating agent addition device A according to the second embodiment includes an automatic heavy metal concentration measuring device 1A instead of the automatic heavy metal concentration measuring device 1 of the first embodiment. That is, this automatic chelating agent addition device A is a composite device that includes the automatic heavy metal concentration measuring device 1A as a component.

[0036] The heavy metal concentration automatic measuring device 1A is installed in the ash channel Wa, which has a main channel w1 and a branch channel w2 that branches off from the main channel w1, as shown in Figure 4. The heavy metal concentration automatic measuring device 1A includes a movable plate 1a1, a measuring unit 1b, a back sheet w3, and a cleaning air ejection unit 5. The movable plate 1a1 is installed at the branching point between the main channel w1 and the branch channel w2, as shown in the figure, and collects ash D by rotating around a rotation axis Ra and supplies it to the branch channel w2.

[0037] The rotating shaft Ra is provided in a horizontal position at the end of the ash channel Wa. The movable plate 1a1 is supported at the end of the ash channel Wa via this rotating shaft Ra, and by rotating around the rotating shaft Ra, it collects a portion of the ash D passing from top to bottom as collected ash. Such a movable plate 1a1 is the sampling plate in the second embodiment. Furthermore, the movable plate 1a1 in the second embodiment corresponds to the collection unit of the present invention.

[0038] In this automatic heavy metal concentration measuring device 1A, the measuring unit 1b is located within the branched channel w2 as shown in the figure. Similar to the first embodiment, this measuring unit 1b obtains the concentration of heavy metal components (heavy metal concentration) in the collected ash by irradiating the collected ash with X-rays.

[0039] In this automatic heavy metal concentration measuring device 1A, as shown in Figure 4(a), the movable plate 1a1 rotates to the right in the plane of the paper, changing from a vertical position to an inclined position, so that the upper tip of the movable plate 1a1 protrudes in an inclined state toward the main flow path w1. The ash D then flows down from the upper tip along the surface of the inclined movable plate 1a1 and is guided into the branch flow path w2.

[0040] Then, the ash D flows down and is stored in the space formed by the back sheet w3 and the movable plate 1a1, which are inclined to an angle greater than or equal to the angle of repose of fly ash (40°) and are located within the branched channel w2. Within the branched channel w2, the measuring unit 1b, located at a position in contact with the stored ash D, irradiates the collected ash flowing down from the movable plate 1a1 with X-rays, and detects the fluorescent X-rays obtained when these X-rays are excited by the heavy metal components in the collected ash, thereby obtaining the heavy metal concentration. In this automatic heavy metal concentration measuring device 1A, once the acquisition of the heavy metal concentration is complete, as shown in Figure 4(b), the movable plate 1a1 returns to a vertical position, and cleaning air is temporarily sprayed from the spray unit 5 towards the measuring window 1b, and no collected ash is collected.

[0041] According to this second embodiment, since ash D is collected by rotating the movable plate 1a1 (sampling plate), the stability of the sampling operation can be improved compared to conventional devices. Furthermore, the collected ash is compressed by the force of falling during flow and the weight of the ash itself, enabling more accurate measurement. In addition, the movable plate 1a1 does not obstruct the main flow path w1 when not measuring, making it possible to provide an automatic heavy metal concentration measuring device 1A.

[0042] Furthermore, the automatic chelating agent addition device A according to the second embodiment comprises an automatic heavy metal concentration measuring device 1A, an addition device 3 for adding a chelating agent to ash, and a control device 2 that acquires a measurement signal S indicating the heavy metal concentration of ash D by controlling the automatic heavy metal concentration measuring device 1, and controls the addition device 3 based on the measurement signal S.

[0043] [Third Embodiment] Next, a third embodiment of the present invention will be described with reference to Figure 5. The automatic chelating agent addition device A according to the third embodiment includes an automatic heavy metal concentration measuring device 1B instead of the automatic heavy metal concentration measuring device 1A of the second embodiment. That is, this automatic chelating agent addition device A is a composite device that includes the automatic heavy metal concentration measuring device 1B as a component.

[0044] As shown in Figure 5, the automatic heavy metal concentration measuring device 1B is installed in the ash flow path Wa, which has a main flow path w1, a branch flow path w2 branching off from the main flow path w1, a back sheet w3 inclined to an angle greater than or equal to the angle of repose of fly ash (40°), and a cleaning air ejection section 5. The automatic heavy metal concentration measuring device 1B includes a movable plate 1a2, a measuring section 1b, and a flap damper 4. As shown in the figure, the movable plate 1a2 is installed at the branching point between the main flow path w1 and the branch flow path w2, and rotates around the rotation axis Rb to flow ash D down and supply it to the branch flow path w2.

[0045] The rotating shaft Rb is provided in a horizontal position at the end of the ash channel Wa. The movable plate 1a2 is supported at the end of the ash channel Wa via this rotating shaft Rb, and by rotating around the rotating shaft Rb, it collects a portion of the ash D passing from top to bottom as collected ash. Such a movable plate 1a2 is the sampling plate in the third embodiment. Furthermore, the movable plate 1a2 in the third embodiment corresponds to the collection unit of the present invention.

[0046] The measurement unit 1b in this heavy metal concentration automatic measuring device 1B is located within the branch channel w2, similar to the measurement unit 1b in the second embodiment. The preferred installation position of the measurement unit 1b is near the upper surface when the flap damper 4, which is densely packed with collected ash, is horizontal. Similar to the measurement unit 1b in the first and second embodiments, the measurement unit 1b acquires the concentration of heavy metal components (heavy metal concentration) in the collected ash by irradiating the collected ash with X-rays.

[0047] The flap damper 4 is a second movable plate that restricts the falling (passage) of collected ash. As shown in the figure, the flap damper 4 is located below the measuring unit 1b in the branched flow path w2 and allows or prevents the falling (passage) of collected ash by rotating around the rotation axis L.

[0048] In this automatic heavy metal concentration measuring device 1B, as shown in Figure 5(a), the movable plate 1a2 rotates to the right of the plane of the paper, changing from a vertical position to an inclined position, and the upper tip of the movable plate 1a2 protrudes into the main flow path w1. The ash D is then guided into the branch flow path w2 by flowing down along the surface of the inclined movable plate 1a2 from the upper tip.

[0049] In this automatic heavy metal concentration measuring device 1B, the flap damper 4 prevents the collected ash from falling (passing through), causing the collected ash to accumulate on the flap damper 4. The measuring unit 1b, located in the branched channel w2, irradiates the collected ash on the flap damper 4 with X-rays, and detects the fluorescent X-rays obtained when these X-rays are excited by the heavy metal components in the collected ash, thereby obtaining the heavy metal concentration.

[0050] Then, in this heavy metal concentration automatic measuring device 1B, once the acquisition of heavy metal concentration is complete, the movable plate 1a2 returns to a vertical position as shown in Figure 5(b). This state indicates that the heavy metal concentration automatic measuring device 1B is not collecting ash samples.

[0051] According to this third embodiment, since ash D is collected by rotating the movable plate 1a2 (sampling plate), the stability of the sampling operation can be improved compared to conventional devices. Furthermore, the collected ash is compressed by the force of falling during flow and the weight of the ash itself, enabling more accurate measurement. In addition, the movable plate 1a1 does not obstruct the main flow path w1 when not measuring, making it possible to provide an automatic heavy metal concentration measuring device 1B.

[0052] Furthermore, this automatic heavy metal concentration measuring device 1B acquires the heavy metal concentration by irradiating the collected ash accumulated on the regulated plate 4 with X-rays, making it possible to measure the heavy metal concentration in a stable state.

[0053] Furthermore, the automatic chelating agent addition device A according to the third embodiment includes an automatic heavy metal concentration measuring device 1B, an addition device 3 for adding the chelating agent to the ash, and a control device 2 that acquires a measurement signal S indicating the heavy metal concentration of the ash D by controlling the automatic heavy metal concentration measuring device 1, and controls the addition device 3 based on the measurement signal S.

[0054] According to this third embodiment, since ash D is collected by rotating the movable plate 1a2 (sampling plate), it is possible to provide an automatic rate material adding device A that can improve the stability of sampling compared to conventional devices.

[0055] It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be considered without altering the essence of the invention. [Explanation of Symbols]

[0056] A. Automatic chelating agent addition device P Ash channel S Measurement signal W Ash channel w1 Main flow path w2 branch channel w3 back seat 1, 1A, 1B Automatic heavy metal concentration measuring device 1a Rotary valve (movable plate, sampling plate, sampling section) 1a1 Movable plate (sampling plate) 1a2 Movable plate (sampling plate) 1b Measurement unit 1c X-ray transmission window 1d X-ray transparent film 1e, 1f flange 1g bolt 2 Control device 3 Addition device 4. Flap damper 5. Cleaning air nozzle

Claims

1. A sampling unit that collects ash passing through the ash channel, The system includes a measuring unit for measuring the heavy metal concentration of the collected ash from the sampling unit, The aforementioned sampling unit is an automatic heavy metal concentration measuring device characterized by collecting ash by rotating a sampling plate.

2. The heavy metal concentration automatic measuring device according to claim 1, characterized in that the sampling plate is a movable plate with a rotating shaft provided at the end of the ash flow path, and the ash is collected by rotating it around the rotating shaft.

3. The automatic heavy metal concentration measuring device according to claim 2, characterized in that the sampling plate is a rotary valve that rotates around the rotation axis.

4. The automatic heavy metal concentration measuring device according to claim 1 or 2, characterized in that the sampling plate supplies the collected ash to a branch channel that branches off from the main channel of the ash channel.

5. The automatic heavy metal concentration measuring device according to claim 4, characterized in that the branch channel is provided with a regulating plate for restricting the passage of the collected ash.

6. The automatic heavy metal concentration measuring device according to claim 1 or 2, characterized in that the measuring unit irradiates the collected ash with X-rays through an X-ray transmission window and measures the heavy metal concentration based on the fluorescent X-rays excited by the irradiation of the X-rays.

7. An automatic heavy metal concentration measuring device according to claim 1 or 2, An additive device for adding a chelating agent to the ash, A control device that controls the heavy metal concentration automatic measuring device to obtain a measurement signal indicating the heavy metal concentration of the ash, and controls the additive device based on the measurement signal. An automatic chelating agent addition device characterized by comprising the following features.

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