KR101716859B1 - System for controlling hydrogen sulfide removing apparatus - Google Patents

Abstract

The present invention relates to a system for controlling a hydrogen sulfide removal apparatus, which can automatically provide notification of gas-liquid contact layer replacement time and can automatically wash a gas-liquid contact layer. According to the present invention, provided is the system for controlling a hydrogen sulfide removal apparatus, which comprises: the hydrogen sulfide removal apparatus which comprises at least one gas-liquid contact layer disposed on a path of movement of biogas, and which uses only a pall ring layer as the gas-liquid contact layer, uses only at least one of a gas-liquid contact belt and a gas-liquid contact disk as the gas-liquid contact layer, or uses not only the pall ring layer but also at least one of the gas-liquid contact belt and the gas-liquid contact disk as the gas-liquid contact layer; a pressure sensor which senses front pressure, i.e., the pressure of a path of movement located in front of the gas-liquid contact layer, and back pressure, i.e., the pressure of a path of movement located behind the gas-liquid contact layer; and a controller which calculates a pressure difference between the front pressure and the back pressure, and which compares the pressure difference with a preset reference value. In this case, the pressure difference is the difference between the pressures in front of and behind the pall ring layer, i.e., the difference between the pressures in paths of movement in front of and behind the pall ring layer, and the reference value is a first reference value, i.e., a compassion target for the difference between the pressures in front of and behind the pall ring layer. When the difference between pressures in front of and behind the pall ring layer is larger than the first reference value, the controller outputs a replacement notification signal.

Description

SYSTEM CONTROLLING HYDROGEN SULFIDE REMOVING APPARATUS [0001]

The present invention relates to a control system for controlling a hydrogen sulfide removal device used for removing hydrogen sulfide from biogas generated in the treatment of organic wastes.

BACKGROUND ART Recently, technologies for producing biogas such as methane by anaerobic digestion of organic waste such as food waste, livestock manure, sewage sludge, and the like are being developed. Such biogas production and utilization methods are attracting attention in that biogas can be used as an energy source, and besides it can reduce the environmental pollutant load.

Biogas obtained through anaerobic digestion of organic wastes contains hydrogen sulfide (H2S) in addition to methane gas. This hydrogen sulphide is produced by sulfur-reducing bacteria that reduce sulfur and sulfate. However, such hydrogen sulfide is not only harmful to the human body, but also can be converted into sulfur dioxide and sulfuric acid when the biogas is recycled, thereby eroding a device using biogas as an energy source. Therefore, it is essential to remove hydrogen sulfide to recycle biogas.

At present, there is known a hydrogen sulfide removal device used for removing hydrogen sulfide. In this hydrogen sulfide removal device, gas-liquid contact layers are provided on the path through which the biogas moves, and the liquid catalyst is sprayed onto the gas-liquid contact layers. At this time, hydrogen sulfide is removed from the biogas, and the precipitate, which is a by-product of the chemical reaction, is attached to the surface of the gas-liquid contact layer.

The gas-liquid contact layer may be formed of a poling layer as disclosed in Japanese Patent No. 10-1612004 (hydrogen sulfide removal device) and 10-0766125 (hydrogen sulfide removal device using liquid catalyst) Liquid contacting belt as disclosed in Japanese Patent Application No. 1580105 (a hydrogen sulfide removing device having a gas-liquid contact belt), and is made of a gas-liquid contact disk as disclosed in Japanese Patent No. 10-1620994 (hydrogen sulfide removal device having a gas-liquid contact disk) I will.

Registered Patent No. 10-1612004 (hydrogen sulfide removal device) Registration No. 10-0766125 (hydrogen sulfide removal device using liquid catalyst) No. 10-1580105 (hydrogen sulfide removal device with gas-liquid contact belt) No. 10-1620994 (hydrogen sulfide removal device with gas-liquid contact disk)

As described above, in the hydrogen sulfide removal apparatus, sediments, which are by-products of chemical reactions, adhere to the gas-liquid contact layers. Therefore, the gas-liquid contact layers must be periodically replaced or cleaned. For example, if the gas-liquid contact layer is a poling layer, the operation of replacing the polls with deposits with new polings should be performed periodically, and if the gas-liquid contact layer is made of a gas-liquid contact belt or gas- Work must be done on a regular basis.

Therefore, the present invention provides a technique of automatically notifying the replacement time of the gas-liquid contact layer when the gas-liquid contact layer is a poling layer and automatically cleaning the gas-liquid contact layer when the gas-liquid contact layer is a belt or a disk.

The present invention relates to a method for manufacturing a gas-liquid contact member, which comprises at least one gas-liquid contact layer provided on a moving path of a biogas, wherein only the poling layer is used as the gas- Liquid contact layer as well as at least one of the gas-liquid contact belt and the gas-liquid contact disc as well as the polling layer; A pressure sensor for sensing a front pressure which is a pressure of the traveling path located in front of the gas-liquid contact layer and a rear pressure which is a pressure of the traveling path located behind the gas-liquid contact layer; And a controller for subtracting the rear pressure from the front pressure to calculate a pressure difference, and for comparing the pressure difference with a preset reference value. Wherein the reference value is a first reference value that is a comparison target of the pressure difference between the front and back of the polling layer and the pressure difference between the front and back of the polling layer is greater than the first reference value If so, the controller outputs a replacement notification signal.

If the reference value is a second reference value to be compared with the belt front-back pressure difference, and if the belt front-back pressure difference is larger than the second reference value, the pressure difference is a pressure difference between the belt front- The controller outputs an operation signal of the cleaning device provided for spraying the cleaning liquid onto the surface of the gas-liquid contact belt.

At this time, if the belt front / back pressure difference is smaller than the second reference value, the controller outputs a stop signal of the cleaning device.

If the reference value is a fourth reference value to be compared with the front / back pressure difference of the disc and the pressure difference between the front and back of the disc is larger than the fourth reference value, The controller outputs an operation signal of the cleaning device provided for spraying the cleaning liquid onto the surface of the gas-liquid contact disk.

At this time, if the disk front / back pressure difference is smaller than the fourth reference value, the controller outputs a stop signal of the cleaning device.

The present invention automatically informs the replacement point of the gas-liquid contact layer when the gas-liquid contact layer of the hydrogen sulfide removal device is a poling layer.

Further, the present invention automatically performs the cleaning of the gas-liquid contact layer and the interruption of the cleaning when the gas-liquid contact layer is a gas-liquid contact belt or a gas-liquid contact disk.

1 shows a control system of a hydrogen sulfide removal device according to a first embodiment of the present invention.
FIG. 2 shows a control system of a hydrogen sulfide removal device according to a second embodiment of the present invention.
3 shows a control system of the hydrogen sulfide removal device according to the third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a control system for a hydrogen sulfide removal device according to the present invention will be described in detail with reference to the drawings. It is to be understood that the terminology or words used herein are not to be construed in an ordinary sense or a dictionary, and that the inventor can properly define the concept of a term to describe its invention in the best possible way And should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

≪ Embodiment 1 >

1, the control system 100 of the hydrogen sulfide removal device according to the first embodiment of the present invention includes a hydrogen sulfide removal device, pressure sensors 130, 132 and 134, and a controller 140 .

The hydrogen sulfide removal device is a device for removing hydrogen sulfide from a biogas using a liquid catalyst, and includes a tank 110 and a polling layer 120 and 122 as gas-liquid contact layers. Hereinafter, two polling layers 120 and 122 are provided. However, the number of the polling layers 120 and 122 may be less or more than two.

The tank 110 has a transfer path 110a, 110b and 110c for the biogas therein and is connected to the front inlet pipe 112 and the rear outlet pipe 114. [ The biogas flowing into the inflow pipe 112 moves along the moving passages 110a, 110b and 110c and is discharged to the discharge pipe 114. [ Inside the tank 110, there are provided spray nozzles 116b and 116c for spraying the liquid catalyst downward.

The poling layers 120 and 122 are provided to increase the contact area and contact time between the liquid catalyst and the biogas, and are composed of a plurality of polling rings and a frame containing the polls. The poling layers 120 and 122 are installed inside the tank 110 to divide the traveling path into a first traveling path 110a, a second traveling path 110b and a third traveling path 110c.

The liquid catalyst injected by the injection nozzles 116b and 116c passes through the poling layers 120 and 122 from top to bottom and the biogas passes through the polling layers 120 and 122 from below to below. As the contact area and the contact time between the biogas and the liquid catalyst are sufficiently ensured, a chemical reaction takes place between them, in which hydrogen sulfide is removed from the biogas. Some of the precipitate, which is a by-product of the chemical reaction, adheres to the surface of the poles and the remainder falls with the liquid catalyst.

The liquid catalyst and the precipitate that has dropped together with the liquid are pushed to the bottom of the tank 110 and then supplied to the dehydrator 10 to be dehydrated, whereby the liquid catalyst is separated from the precipitate. The liquid catalyst separated from the precipitate is regenerated in the liquid catalyst regeneration tank 20 and then supplied to the injection nozzles 116b and 116c.

The pressure sensors 130, 132, and 134 are installed to sense the back and forth pressures of the traveling passages 110a, 110b, and 110c. Specifically, the primary pressure sensor 130 measures the pressure of the first moving path 110a located in front of the primary polling layer 120, the secondary pressure sensor 132 detects the pressure of the primary polling layer 120, And the third pressure sensor 134 detects the pressure of the second moving path 110b located on the rear side of the second polling layer 122 and the third moving path 110b located on the rear side of the second polling layer 122, (110c).

The controller 140 uses the outputs of the pressure sensors 130, 132, and 134 to calculate the pressure difference between the front and back of the polling layer. More specifically, the controller 140 subtracts the pressure of the second traveling path 110b sensed by the secondary pressure sensor 132 from the pressure of the first traveling path 110a detected by the primary pressure sensor 130 The pressure difference between the front and back of the poling layer for the car polling layer 120 is calculated. The controller 140 subtracts the pressure of the third traveling path 110c sensed by the tertiary pressure sensor 134 from the pressure of the second traveling path 110b sensed by the secondary pressure sensor 130, Thereby calculating the front-back pressure difference of the poling layer with respect to the polling layer 122. [

Thereafter, the controller 140 compares the calculated front-back pressure difference with the preset first reference value. Specifically, the controller 140 compares the magnitude between the poling layer front-back pressure difference for the primary polling layer 120 and the preset first reference value. In addition, the controller 140 compares the magnitude between the pre-back pressure difference of the polling layer for the secondary polling layer 122 and the preset first reference value. Here, the reference values for the primary polling layer 120 and the secondary polling layer 122 are all referred to as a first reference value, but the two reference values may be set to different values.

The fact that the pressure difference between the front and back of the poling layer is larger than the first reference value means that the biogas can not pass through the polling layers 120 and 122 smoothly. For example, if the pressure difference between the back and forth poles of the poling layer for the primary polling layer 120 is greater than the first reference value, the degree of deposition of deposits on the surface of the poles of the primary polling layer 120 is high, , And the same is true in the case of the secondary polling layer 122 as well. Therefore, if the pressure difference between the front and back of the polling layer is greater than the first reference value, it is determined that the polling layers 120 and 122 need to be replaced, and the controller 140 outputs a replacement notification signal.

This replacement notification signal can be utilized in various forms. For example, the replacement notification signal may be transmitted to an alarm device provided separately, in which case the alarm will generate an alarm sound indicating the replacement. In addition, the replacement notification signal may be transmitted to a communication module provided separately. In this case, the communication module will transmit a text message indicating that the operator has previously registered the replacement mobile terminal.

≪ Embodiment 2 >

2, the control system 200 of the hydrogen sulfide removal apparatus according to the second embodiment of the present invention includes a hydrogen sulfide removal device, pressure sensors 130, 132 and 134, and a controller 240 . There is a difference between the control system 200 according to the present embodiment and the control system 100 according to the first embodiment only in the structure of the hydrogen sulfide removal device and the function of the controller 240. Hereinafter, Explain.

In the hydrogen sulfide removing device of the present embodiment, the first polling layer 120 of the hydrogen sulfide removing device of the first embodiment is replaced with the gas-liquid contact belt 220. Therefore, the pressure difference between the front and back of the poling layer for the first polling layer 120 becomes the belt back and forth pressure difference in this embodiment. On the other hand, the gas-liquid contact belt 220 is disclosed in detail in Japanese Patent No. 10-1580105 (hydrogen sulfide removing apparatus having a gas-liquid contact belt), and a description thereof will be omitted here.

The hydrogen sulfide removal device of this embodiment further includes a cleaning device 250 for cleaning the gas-liquid contact belt 220. The cleaning apparatus 250 includes a branch pipe 256 branched from a pipe for supplying the liquid catalyst to the injection nozzle 116b. The cleaning device 250 also includes a cleaning liquid injection nozzle 254 disposed at the lower end of the upper branch pipe 256 for spraying a cleaning liquid (liquid catalyst) onto the surface of the gas-liquid contact belt 220, And also includes a valve 252 that is provided in the cleaning liquid injection nozzle 254 to allow or prohibit the supply of the cleaning liquid to the cleaning liquid injection nozzle 254.

The controller 240 uses the outputs of the primary and secondary pressure sensors 130, 132 to calculate the belt front-back pressure differential. Specifically, the controller 240 subtracts the pressure of the second traveling path 110b sensed by the secondary pressure sensor 132 from the pressure of the first traveling path 110a detected by the primary pressure sensor 130, Calculate the front and back pressure difference. Further, the controller 240 uses the outputs of the second and third pressure sensors 132 and 134 to calculate the pressure difference between the front and back of the polling layer, which is the same as in the first embodiment.

Thereafter, the controller 240 compares the belt front-back pressure difference calculated and the magnitude between the preset second reference value. The controller 240 also compares the calculated pressure difference between the front and rear sides of the polling layer with a predetermined first reference value. The operation performed by the controller 240 after the comparison of the magnitude between the front-back pressure difference of the poling layer and the first reference value is the same as in the first embodiment. Hereinafter, only the process after the comparison between the belt front- do.

The fact that the belt front-back pressure difference is larger than the second reference value means that the degree of deposition of the deposit on the gas-liquid contact belt 220 is so severe that the biogas can not pass smoothly through the gas-liquid contact belt 220. The controller 240 determines that the gas-liquid contact belt 220 needs to be cleaned, and outputs an operation signal for operating the cleaning apparatus 250 to the valve 252. In this case, Then, the closed valve 252 is opened, and the cleaning liquid injection nozzle 254 injects the cleaning liquid onto the surface of the gas-liquid contact belt 220.

The stopping point of the cleaning device 250 may be set variously. For example, the controller 240 may output a stop signal to the valve 252 after a predetermined cleaning time has elapsed after the operation signal is output. Then, the valve 252 is closed and the cleaning liquid injection is terminated. Alternatively, the controller 240 may output a stop signal to the valve 252 if the belt front-back pressure difference is smaller than a second reference value, which is smaller than a preset third reference value. When the pressure difference between the front and back of the belt is smaller than the third reference value, it means that the biogas is passing smoothly through the gas-liquid contact belt 220, in which case the controller 240 terminates the cleaning.

It is needless to say that the poling layer 122 may not be provided in the hydrogen sulfide removing device of the present embodiment, and the polling layer 122 may be constituted by the gas-liquid contact belt 220.

≪ Third Embodiment >

The control system 300 of the hydrogen sulfide removal system according to the third embodiment of the present invention includes a hydrogen sulfide removal device, pressure sensors 130, 132 and 134, and a controller 340 as shown in FIG. 3 . There is a difference between the control system 300 according to the present embodiment and the control system 200 according to the second embodiment only in the configuration of the hydrogen sulfide removal device and the function of the controller 340. Hereinafter, Explain.

In the hydrogen sulfide removing device of this embodiment, the gas-liquid contact belt 220 of the hydrogen sulfide removing device of the second embodiment is replaced with the gas-liquid contact disc 320. Therefore, the pressure difference between the front and back of the belt of the second embodiment becomes the disk back-and-forth pressure difference in this embodiment. On the other hand, the gas-liquid contact disc 320 is disclosed in detail in Japanese Patent No. 10-1620994 (hydrogen sulfide removal device having a gas-liquid contact disc), and a description thereof will be omitted here.

The controller 340 uses the outputs of the primary and secondary pressure sensors 130 and 132 to calculate the disk back and forth pressure difference. The controller 340 subtracts the pressure of the second traveling path 110b sensed by the secondary pressure sensor 132 from the pressure of the first traveling path 110a sensed by the primary pressure sensor 130, Calculate the front and back pressure difference. Further, the controller 340 calculates the pressure difference between the front and back of the polling layer by using the outputs of the second and third pressure sensors 132 and 134 as in the second embodiment.

Thereafter, the controller 340 compares the calculated disc front-back pressure difference with the preset fourth reference value. The controller 340 also compares the calculated front-back pressure difference with the preset first reference value. The operation performed by the controller 340 after comparing the magnitude between the front-back pressure difference of the poling layer and the first reference value is the same as in the previous embodiments. Hereinafter, only the process after the comparison of the magnitude between the back- do.

The fact that the pressure difference between the front and back of the disk is larger than the fourth reference value means that the degree of deposition of the deposit on the gas-liquid contact disc 320 is so great that the biogas can not pass smoothly through the gas-liquid contact disc 320. The controller 340 determines that the gas-liquid contact disc 320 needs to be cleaned, and outputs an operation signal for operating the cleaning apparatus 250 to the valve 252. In this case, Then, the closed valve 252 is opened, and the cleaning liquid injection nozzle 254 injects the cleaning liquid onto the surface of the gas-liquid contact disc 320.

The stopping point of the cleaning device 250 can be set to the same as in the second embodiment. However, the third reference value of the second embodiment is a fifth reference value set in advance so as to be smaller than the fourth reference value in the present embodiment.

It is needless to say that the poling layer 122 may not be provided in the hydrogen sulfide removing device of the present embodiment and that the polling layer 122 may be constituted by the gas-liquid contact disc 320 and the gas-liquid contact belt 220.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

100, 200, 300: Control system of hydrogen sulfide removal system
110: tank 112: inlet pipe
114: discharge pipe 110a, 110b, 110c:
116b, 116c: injection nozzle 120, 122: polling layer
130, 132, 134: pressure sensors 140, 240, 240:
220: gas-liquid contact belt 250: cleaning device
252: valve 254: cleaning liquid injection nozzle
256: branch tube 320: gas-liquid contact disk
10: dehydrator 20: regeneration tank

Claims (5)

A plurality of gas-liquid contact layers provided on the moving path so as to sequentially pass biogas flowing along the moving path and dividing the moving path into a plurality of parts; a plurality of gas-liquid contact layers arranged in the direction opposite to the passing direction of the biogas, A plurality of injection nozzles for spraying the liquid catalyst to be passed through the gas-liquid contact layers, respectively;
Liquid contact layers, a pressure of a moving path located in front of a frontmost one of the gas-liquid contact layers, and a pressure of a moving path located at the rear of the gas- A plurality of pressure sensors each sensing a pressure of the traveling path; And
The operation of calculating the pressure difference by subtracting the rear pressure sensed as being located at the rear from the front pressure detected by the front side of the two adjacent pressure sensors is performed for all of the plurality of pressure sensors, And a controller for outputting a replacement notification signal or a cleaning device operation signal according to the shape of the gas-liquid contact layer when any one of the gas-liquid contact layers is larger than a predetermined reference value. The method according to claim 1,
Wherein the plurality of gas-liquid contact layers are all formed of a poling layer, all of them are composed of gas-liquid contact belts, all of them are composed of gas-liquid contact discs, or all of them are composed of at least two of the poling layers,
Wherein the replacement notification signal is output when the gas-liquid contact layer is a polling layer, and when the gas-liquid contact layer is the gas-liquid contact belt or the gas-liquid contact disk. 3. The method of claim 2,
Wherein the controller outputs a cleaning device stop signal when the pressure difference becomes smaller than a preset reference value such that the pressure difference is smaller than the reference value after the cleaning device operation signal is output.
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