KR101804116B1 - desulfurization apparatus of bio gas - Google Patents

Abstract

The present invention relates to a biogas desulfurizing device. More specifically, to improve a wet desulfurizing method by using only sodium hydroxide, the present invention is capable of effectively removing hydrogen sulfide of biogas through a mixed medicinal solution of sodium hydroxide and sodium hypochlorite as well as easily controlling the redox potential value and pH of the mixed medicinal solution. The present invention includes: a pretreatment part removing dust from biogas containing hydrogen sulfide; and a hydrogen sulfide removing part removing the hydrogen sulfide of the biogas by making contact between a mixed medicinal solution and the biogas which has gone through the pretreatment part. The mixed medicinal solution comprises: a first nutrient solution which is selected from among a sodium hydroxide solution and a potassium hydroxide solution; and a second nutrient solution selected from among a sodium hypochlorite solution and a sodium oxide solution. The hydrogen sulfide removing part includes: a cleaning tower taking the biogas, which has gone through the pretreatment part, through the bottom and discharging the gas through the top; and a medicinal solution supply unit spraying the medicinal solution into the cleaning tower.

Description

Desulfurization apparatus of bio gas [0002]

The present invention relates to a biogas desulfurization apparatus, and more particularly, to a method for desulfurizing a biogas by using a mixed chemical liquid in which sodium hydroxide and sodium hypochlorite are mixed to improve the problems of the conventional wet desulfurization method using only sodium hydroxide or sodium hypochlorite, The present invention relates to a biogas desulfurization apparatus capable of effectively removing hydrogen sulfide and easily adjusting the pH and oxidation-reduction potential (ORP) of a mixed chemical liquid.

As the industry becomes more sophisticated and the human life becomes better, the problem of disposal of high concentration organic wastes such as livestock manure and food wastes is getting serious and the energy source is being secured through anaerobic fermentation for such treatment.

Methane gas production technology by anaerobic fermentation has already been established and popularized in Europe, Japan and other countries. In addition to environmental functions such as treatment of high concentration organic wastes (livestock manure, food waste, agricultural byproducts), production of alternative energy such as biogas It is a technology that can simultaneously achieve the function and the natural cyclical function of the fermented organic wastes through farmland reduction.

Biogas can be a good source of energy because of its high methane content. Therefore, biogas can be used in all customers who use natural gas only after modifying at a reasonable level. For example, biogas can be used as fuel for heating and heating, power generation, or as a fuel for city gas or automobiles through refining.

However, biogas generated through anaerobic fermentation contains hydrogen sulfide (H ₂ S). Exposure of the human body to such hydrogen sulfide not only has a life-threatening effect on the life, but also transforms into sulfur dioxide and sulfuric acid in the process of utilization of biogas such as cogeneration power, thereby adversely affecting facilities such as corrosion of boilers, engine cylinders and exhaust pipes .

Accordingly, a conventional method for removing hydrogen sulfide in biogas generated by anaerobic digestion of organic wastes such as food, livestock manure, sewage sludge, and the like is a dry desulfurization method in which adsorbent is used to remove adsorbent, or a wet desulfurization method in which caustic soda is used to neutralize and remove . The dry desulfurization method has a disadvantage in that it can not maintain its high efficiency in a competitive manner because it is inferior in economic efficiency. Since the biogas is used as a fuel for a boiler or a generator, a city gas, a gas for charging a vehicle, The desulfurization method is emerging as an alternative.

As a conventional desulfurization removal technique by the wet desulfurization method, a biogas desulfurization system of Korean Patent No. 10-1465140 is disclosed. The first treatment tank receives the biogas and comes into contact with the caustic soda treatment water to perform primary treatment. The primary treatment gas discharged from the first treatment tank is supplied to contact with caustic soda + sodium hypochlorite treated water, , A caustic soda supply device for supplying caustic soda to the first and second treatment tanks, a sodium hypochlorite supply device for supplying sodium hypochlorite to the second treatment tanks, and a water supply device for supplying water to the first and second treatment tanks And a control unit for maintaining the pH of the primary and secondary treatment baths.

In the biogas desulfurization system, the first treatment is performed by contacting the biogas with the caustic soda water in the first treatment tank, and the first treatment gas discharged from the first treatment tank is treated with caustic soda + sodium hypochlorite And a secondary treatment is performed in contact with water.

However, when the biogas is introduced into the treatment tank and brought into contact with the treatment water as described above, there is a problem that the removal efficiency of the primary treatment tank is low. Also, since the two treatment steps must be performed in the first treatment tank and the second treatment tank, the composition becomes complicated, and it is very difficult to adjust the pH of the caustic soda and the ORP of sodium hypochlorite, which are the chemicals to be injected, resulting in excessive consumption of chemicals and wastewater , The removal efficiency is low, and the processing time is long.

Korean Patent No. 10-1465140: Biogas desulfurization system

Disclosure of Invention Technical Problem [8] The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a biocide- It is an object of the present invention to provide a biogas desulfurization apparatus having high efficiency and excellent desulfurization effect.

 It is another object of the present invention to provide a biogas desulfurization apparatus capable of easily adjusting the pH and oxidation-reduction potential of a mixed chemical liquid and to remove dust, oil, moisture and the like mixed in the biogas.

According to an aspect of the present invention, there is provided a biogas-desulfurizing apparatus comprising: a pretreatment unit for removing foreign matter from a biogas containing hydrogen sulfide; And a hydrogen sulfide removing agent for removing the hydrogen sulfide in the biogas by bringing the biogas having passed through the pretreatment section into contact with the mixed chemical liquid, wherein the mixed chemical liquid is any of the first chemical liquid selected from a sodium hydroxide solution and a potassium hydroxide solution, And a second chemical liquid selected from a sodium hydroxide solution and a sodium oxide solution is mixed and the hydrogen sulfide removal unit includes a washing tower in which the biogas having passed through the pretreatment unit flows downward and is discharged to the upper part, And a chemical liquid supply unit for injecting the mixed chemical liquid. The chemical liquid supply unit includes a mixed chemical liquid storage tank installed at a lower portion of the washing tower and connected to the inside of the washing tower to store the mixed chemical liquid, A mixed chemical liquid supply pipe connected to the storage tank and to which the mixed chemical liquid is moved by a circulation pump First and second spray nozzles which are vertically spaced apart from each other in the washing tower and spray mixed medicinal liquid supplied through the mixed medicinal solution supply pipe into the washing tower; First and second branch nozzles respectively connected to the first and second injection nozzles, first and second check valves provided respectively to the first and second branch nozzles, And a chemical solution replenishing unit for simultaneously or selectively supplying the first chemical solution and the second chemical solution to adjust the pH and oxidation-reduction potential of the mixed chemical solution flowing into the first and second injection nozzles.

The chemical liquid replenishing section includes a first chemical liquid replenishing tank storing the first chemical liquid, a first replenishing pipe connecting the first chemical replenishing tank and the first branch pipe, and a second replenishing pipe provided in the first replenishing pipe, A first chemical replenishing pump for transferring the first chemical liquid stored in the replenishing tank to the first branch, a second chemical liquid replenishing tank for storing the second chemical liquid, and a second chemical liquid replenishing tank for connecting the second chemical replenishing tank and the second branch pipe A second replenishment pump installed in the second replenishment pipe for moving the second chemical liquid stored in the second chemical liquid replenishing tank to the second distributor; Closing control means for simultaneously or selectively opening and closing the flow path of the fluid.

The pretreatment unit includes a biogas inlet pipe connected to the washing tower for introducing the biogas into the washing tower, a filter type dust collector installed in the biogas inlet pipe to remove dust in the biogas, An ozone injection pipe connected to the biogas inlet pipe to inject ozone into the biogas passing through the ozone injection pipe, and an ozone generator connected to the ozone injection pipe to supply ozone.

The biogas inlet pipe and the ozone injection pipe are connected by a connecting means, and the connecting means includes a flange pipe coupled to the biogas inlet pipe, and an ozone injection pipe installed inside the flange pipe, And a rotation unit for rotating the injection module, wherein the injection module comprises: a cylindrical rotating body having a hollow inside; and a plurality of protrusions formed on an outer surface of the rotating body at predetermined intervals, And a discharge pipe for discharging ozone introduced into the flange pipe, wherein the rotation unit is provided outside the flange pipe and has an inlet through which fluid is introduced into an upper portion and an outlet through which fluid is discharged in a lower portion An impeller rotatable by a flow of biogas that is installed in the casing and flows through the inlet of the casing; A rotary joint which is axially coupled to the impeller and extends to the inside of the flange tube and is coupled to the rotary body and hollow inside; a rotary joint connecting the rotary shaft and the ozone injection tube; A first biogas diesel tube connected to an inlet of the casing to introduce biogas flowing through the inside of the flange tube into the casing, and a second biogas diesel tube having one side connected to the outlet of the casing and the other side connected to the outlet of the flange tube And a second biogas diesel pipe connected to the inside of the flange pipe to allow the biogas that has passed through the casing to flow into the inside of the flange pipe.

As described above, according to the present invention, by contacting a biochemical mixture with a mixed chemical solution in which sodium hydroxide and sodium hypochlorite are mixed in one cleaning tower, the apparatus can be easily implemented and the contact efficiency between gas and liquid is high, .

In addition, the present invention can easily control the pH and the oxidation-reduction potential of the mixed chemical liquid by selectively supplying or simultaneously supplying the first chemical liquid or the second chemical liquid to the mixed chemical liquid.

FIG. 1 is a schematic view of a biogas desulfurization apparatus according to an embodiment of the present invention,
FIG. 2 is a schematic view of a biogas desulfurization apparatus according to another embodiment of the present invention,
FIG. 3 is a perspective view of another essential part applied to FIG. 2,
4 is a partially cutaway perspective view showing the inside of FIG.

Hereinafter, a biogas desulfurization apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1, a biogas desulfurization apparatus according to the present invention includes a pretreatment unit for removing dust in a biogas containing hydrogen sulfide, a pretreatment unit for contacting the biogas having passed through the pretreatment unit with a mixed chemical solution to remove hydrogen sulfide .

The pretreatment unit removes the foreign substances in the biogas containing hydrogen sulfide and then enters the hydrogen sulfide removal unit. Dust, oil, moisture, etc. can be mentioned as foreign matter. If the foreign substance contained in the hydrogen sulfide is not removed, the nozzle of the apparatus is clogged and the chemical is diluted due to excessive water inflow. Therefore, it is necessary to remove foreign matter such as dust, oil, moisture through the pretreatment unit.

Biogas containing hydrogen sulfide can come from the biogas production facility. Biogas production facilities produce biogas through anaerobic digestion of organic wastes such as food, livestock manure, and sewage sludge. The present invention can be utilized, for example, as an apparatus for removing hydrogen sulfide contained in biogas.

In addition, the hydrogen sulfide-containing biogas can be generated from a malodor generating facility for generating malodorous substances. Major odor generating facilities include sewage treatment plants, incinerators, food waste disposal facilities, feed drying facilities, landfills, manure and livestock wastewater treatment plants, refineries, and chemical plants.

The pretreatment unit includes a biogas inflow pipe 1 connected to the hydrogen sulfide removal unit for introducing the hydrogen sulfide-containing biogas to the hydrogen sulfide removal unit, and a filter unit installed in the biogas inflow pipe 1 to remove dust from the biogas. And a dust collector (3).

A filter type dust collector (3) is installed in the biogas inflow pipe (1) to remove foreign substances in the biogas. A blower (5) for sucking and blowing the biogas is installed in front of the dust collector (3).

The hydrogen sulfide removal unit removes hydrogen sulfide in the biogas by contacting the biogas that has passed through the pretreatment unit with the mixed chemical solution.

The hydrogen sulfide removal unit includes a cleaning tower 10 through which the biogas that has passed through the pretreatment unit flows into the lower portion and is discharged to the upper portion and a chemical liquid supply means for spraying the mixed chemical liquid into the cleaning tower 10.

The cleaning tower 10 has an inlet 11 through which a biogas is introduced into a lower portion and an outlet 13 through which an outlet of the biogas is formed. A biogas inlet pipe (1) is connected to the inlet (11). The biogas containing hydrogen sulfide flows into the washing tower 10 through the biogas inflow pipe 1. The biogas introduced into the washing tower 10 moves upward from the inside of the washing tower and is discharged to the outside through the discharge port 13. A treatment biogas discharge pipe (15) is installed in the discharge port (13).

At least one filling layer 12 is installed in the cleaning tower 10. The filling layer is a structure filled with a filler having a large porosity and specific surface area, and uses a pall ring, a rashing ring, or the like as a filling material. In addition, a demister 14 for removing moisture in the biogas may be installed in the cleaning tower 10. The demister 14 is installed in the upper part inside the cleaning tower 10.

The chemical liquid supply means includes a mixed chemical liquid storage tank 20 installed at a lower portion of the washing tower 10 and connected to the inside of the washing tower 10 for storing mixed chemical liquid, A mixed chemical liquid supply pipe 21 in which the mixed chemical liquid is moved by the chemical liquid supply pipe 23 and a mixed chemical liquid supplied through the mixed chemical liquid supply pipe 21 which is vertically spaced in the cleaning tower 10, First and second injection nozzles 31 and 33 which are injected into the mixed chemical liquid supply pipe 21 and connected to the first and second injection nozzles 31 and 33, The first chemical liquid and the second chemical liquid are simultaneously or selectively supplied to the two-branch tractors 35 and 37 and the first and second branch tractors 35 and 37 so as to be introduced into the first and second injection nozzles And a chemical solution replenishing section for adjusting the pH of the mixed chemical solution and the oxidation-reduction potential value.

A mixed chemical liquid for removing hydrogen sulfide is stored in the mixed chemical liquid tank (20). The mixed chemical liquid is formed by mixing the first chemical liquid and the second chemical liquid. For example, the first drug solution to the second drug solution may be mixed at a volume ratio of 1: 0.1 to 1.

The first chemical liquid is any one selected from a sodium hydroxide solution and a potassium hydroxide solution. The sodium hydroxide solution may be an aqueous solution having a concentration of 45% (w / w) in which sodium hydroxide (NaOH) is dissolved in water. The potassium hydroxide solution is obtained by dissolving potassium hydroxide (KOH) in water and may be an aqueous solution having a concentration of 45% (w / w).

The second chemical liquid is any one selected from a sodium hypochlorite solution and a sodium oxide solution. The sodium hypochlorite solution may be an aqueous solution having a concentration of 12% (w / w) in which sodium hypochlorite (NaOCl) is dissolved in water. The sodium oxide solution is a solution of sodium oxide (Na ₂ O) in water and may be an aqueous solution having a concentration of 12% (w / w).

The mixed chemical liquid storage tank 20 is connected to the lower part of the washing tower 10 so that the mixed chemical liquid injected into the washing tower can be introduced into the mixed chemical liquid storage tank 20 again. The mixed chemical liquid stored in the mixed chemical solution storage tank 20 is supplied to the first and second injection nozzles 31 and 33 through the mixed chemical liquid supply pipe 21 by the circulation pump 23.

A water line 24 is connected to the mixed chemical solution storage tank 20 so that water can be supplied to the mixed chemical solution storage tank 20 as needed to dilute the mixed solution to an appropriate concentration.

When the level of the mixed chemical solution stored in the mixed chemical solution storage tank 20 becomes lower than the set water level or when the pH value or the oxidation-reduction potential value of the mixed chemical solution deviates from the set range, the first and second replenishment pumps 43 The mixed chemical solution storage tank 20 is provided with a water level sensor 25 and a pH sensor 27 for oxidizing the first chemical solution and the second chemical solution stored in the first and second supplemental tanks 40 and 50, A reduction potential measuring sensor 29 is provided.

The first and second branches 35 and 37 are branched from the mixed chemical liquid supply pipe 21 and connected to the first and second injection nozzles 31 and 33, respectively. The first branch pipe 35 is connected to the first injection nozzle 31 and the second branch pipe 37 is connected to the second injection nozzle 33. A first check valve and a second check valve are provided in the first branch pipe and the second branch pipe, respectively, to prevent backflow of the chemical liquid.

The first and second injection nozzles 31 and 33 are installed inside the cleaning tower 10. The first and second injection nozzles 31 and 33 are vertically spaced apart from each other in the cleaning tower 10. The first and second injection nozzles 31 and 33 spray the mixed chemical liquid supplied through the mixed chemical liquid supply pipe 21 into the washing tower 10 and contact the biogas flowing into the washing tower 10 .

The chemical solution replenishment part serves to simultaneously and selectively supply the first chemical solution and the second chemical solution to the first and second branch tubes (35) and (37) to adjust the pH value and the oxidation-reduction potential of the mixed chemical solution.

For example, the medicament replenishing section includes a first chemical liquid replenishing tank 40 in which the first chemical liquid is stored, a first replenishing pipe 41 connecting the first chemical replenishing tank 40 and the first branch 35, A first replenishment pump 43 installed in the replenishing line 41 for moving the first chemical liquid stored in the first chemical replenishing tank 40 to the first branch 35 and a second replenishing pump A second replenishment pipe 51 for connecting the second liquid replenishment tank 50 and the second branch pipe 37 to the second replenishment pipe 51, A second replenishing pump 53 for moving the second chemical liquid stored in the tank 50 to the second branch pipe 37 and a second replenishing pump 53 for simultaneously and selectively opening and closing the flow paths of the first and second replenishing pipes 41, Closing control means for controlling the opening / closing control means.

In the first liquid replenishment tank 40, the first chemical liquid is stored. The first chemical liquid is any one selected from a sodium hydroxide solution and a potassium hydroxide solution as described above. The sodium hydroxide solution may be an aqueous solution having a concentration of 45% (w / w) in which sodium hydroxide (NaOH) is dissolved in water. The potassium hydroxide solution is obtained by dissolving potassium hydroxide (KOH) in water and may be an aqueous solution having a concentration of 45% (w / w). The first chemical liquid replenishing tank 40 is provided with a water level sensor for sensing the level of the first chemical liquid.

The first supplement pipe (41) connects the first chemical liquid replenishing tank (40) and the first branch pipe (35).

The first supplemental pump 43 is provided in the first supplement pipe 41 and serves to move the first chemical liquid stored in the first chemical liquid replenishing tank 40 to the first branch pipe 35.

The second chemical solution tank 50 stores the second chemical solution. The second chemical liquid is any one selected from a sodium hypochlorite solution and a sodium oxide solution as described above. The sodium hypochlorite solution may be an aqueous solution having a concentration of 12% (w / w) in which sodium hypochlorite (NaOCl) is dissolved in water. The sodium oxide solution is a solution of sodium oxide (Na ₂ O) in water and may be an aqueous solution having a concentration of 12% (w / w).

The second supplement pipe (51) connects the second chemical liquid replenishment tank (50) and the second branch pipe (37).

The second replenishment pump 53 is provided in the second replenishment pipe 51 and serves to transfer the second drug solution stored in the second drug solution replenishing tank 50 to the second branch pipe 51.

The opening and closing control means selectively or simultaneously opens and closes the flow paths of the first and second supplemental pipes 41 and 51 to inject any one or both of the first and second drug solutions into the mixed drug solution supplied through the mixed drug solution supply pipe .

For example, the opening / closing control means may selectively open only one of the flow paths of the first and second supplemental pipes 41 and 51 so that the first chemical liquid or the second chemical liquid is supplied to the mixed chemical liquid supplied through the mixed chemical liquid supply pipe 21 Can be injected.

That is, when the opening / closing control means opens the flow path of the first supplement pipe (41) and closes the flow path of the second supplement pipe (51), the first chemical liquid flows into the first branch pipe (35) 1 and the second injection nozzles 31, 33, respectively. This makes it possible to adjust the pH value of the mixed chemical liquid. When the opening / closing control means opens the flow path of the second supplemental pipe 51 and closes the flow path of the first supplemental pipe 41, the second chemical liquid flows into the second branch pipe 37 and flows into the mixed chemical liquid supply pipe 21 And is injected into the mixed chemical liquid supplied to the first and second injection nozzles 31, Thus, the redox potential (ORP) value of the mixed chemical liquid can be controlled.

When the opening / closing control means simultaneously opens the flow path of the first supplement pipe (41) and the flow path of the second supplement pipe (51), the first chemical liquid and the second chemical liquid are simultaneously discharged through the mixed chemical liquid supply pipe 2 injection nozzles 31 and 33 so that the pH value and the oxidation-reduction potential (ORP) of the mixed chemical liquid can be adjusted simultaneously.

A first valve 45 provided in the first supplement pipe 41; a second valve 55 provided in the second supplement pipe 51; a first valve 45 installed in the first supplement pipe 41; And a controller (not shown) for controlling the opening / closing of the door 55. Only one of the first valve 45 and the second valve 55 can be selectively opened or both by the controller. Further, the controller can turn on / off the operation of the circulation pump, the first and second supplementary pumps, respectively.

Needless to say, the first and second valves 45 and 55 can be manually opened and closed by an operator instead of the controller.

The mixed chemical liquid is injected into the cleaning tower 10 through the opening / closing control means described above. If necessary, the first chemical liquid is injected into the mixed chemical liquid to adjust the pH value, or the second chemical liquid is injected into the mixed chemical liquid, Can be adjusted.

The pH of the sodium hydroxide used as the first chemical liquid is maintained at 12 or more, and the ORP of the sodium hypochlorite used as the second chemical liquid is maintained at 450 mV or more to achieve optimal desulfurization removal efficiency.

When the pH of sodium hydroxide is 8 ~ 10, the desulfurization removal efficiency is lowered to less than 65%, and when the ORP of sodium hypochlorite is 650 ~ 700 mV, excessive consumption of chemicals and complaints of odor gas due to excessive use occur, . In addition, the cost of wastewater treatment due to excessive use of chemicals is increased, and the operation and maintenance cost is high.

The pH value and the oxidation-reduction potential value can be optimally adjusted according to the concentration of hydrogen sulfide contained in the biogas, physical properties, concentration of other odorous substances, and the like.

In addition, the present invention can be used as a desulfurization facility of high concentration (5,000 ppm or more of hydrogen sulfide) by connecting two or more washing towers in series.

The biogas flowing into the washing tower 10 is brought into contact with the chemical solution in the washing tower 10, and hydrogen sulfide is removed, and then the biogas is discharged through the treatment biogas discharge pipe 15. Treatment The biogas discharged through the biogas discharge pipe may be discharged to the outside or may be introduced into a separate treatment facility.

Another biogas desulfurization apparatus according to another embodiment of the present invention is shown in Fig.

In the illustrated biogas desulfurization apparatus, an ozone generator 60 and an ozone injection pipe 65 are further provided in the pretreatment unit. Other components are the same as those in Fig.

The pretreatment unit includes a biogas inflow pipe 1 connected to the washing tower 10 for introducing the biogas into the washing tower and a filter type dust collector 3 installed in the biogas inflow pipe 1 for removing dust in the biogas An ozone injection pipe 65 connected to the biogas inflow pipe 1 for injecting ozone into the biogas passing through the biogas inflow pipe 1 and an ozone injection pipe 65 connected to the ozone injection pipe 65, And an ozone generator 60 for supplying ozone.

The ozone generator 60 injects ozone into the inside of the biogas inflow pipe 1 through the ozone injection pipe 65. The ozone flowing into the inside of the biogas inflow pipe 1 is effective for oxidizing and decomposing hydrogen sulfide and other odorous substances by contacting with the biogas flowing along the biogas inflow pipe 1. Pre-treatment with ozone is useful for biogas containing hydrogen sulfide or other odorous substances.

The ozone injection pipe 65 is connected to the biogas inflow pipe 1 located between the blower 5 and the dust collector 3 so that the ozone is brought into contact with the biogas that has passed through the blower 5.

The biogas inlet pipe (1) and the ozone injection pipe (65) are connected by a connecting means. The connection means connects the ozone injection pipe 65 to the biogas inlet pipe 1 and promotes the mixing of the ozone with the biogas flowing through the biogas inlet pipe 1 so that the oxidative decomposition effect of the ozone- It is to raise.

3 and 4, the connecting means includes a flange pipe 120 coupled to the biogas inlet pipe 1, and an ozone supply pipe (not shown) provided inside the flange pipe 120, And a rotation unit 140 for rotating the injection module 130. The rotation unit 140 rotates the injection module 130,

The flange tube 120 is installed at one point of the biogas inlet pipe 1. A flange 125 is formed at the front and rear ends of the flange tube 120 so as to be coupled to the biogas inlet pipe 1.

The injection module 130 includes a rotating body 131 and a plurality of projections formed on the outer surface of the rotating body 131 at regular intervals to eject ozone introduced into the rotating body 131 into the inside of the flange tube 120 And a tube 135.

The rotating body 131 is formed in a hollow cylindrical shape. The rotating body 131 is coupled to the rotating shaft 147 of the impeller to be described later and disposed inside the flange tube 120. Ozone flows into the rotating body 131 through the rotating shaft 147.

The discharge tube 135 is formed on the outer surface of the rotating body 131. In the illustrated example, four spray tubes 135 are installed at intervals of 90 degrees. The ozone flowing into the rotating body 131 is sprayed into the inside of the flange pipe 120 through the discharge pipe 135.

The rotation unit 140 generates a rotational force for rotating the injection module 130 by the kinetic energy of the biogas via a part of the biogas flowing through the biogas inflow pipe 1.

In the illustrated example, the rotation unit 140 is provided on the left and right sides of the flange tube 120, respectively. The rotating shaft 147 extending from each rotating unit 140 is coupled to both sides of the rotating body 131 installed inside the flange tube 120.

The rotation unit 140 includes a casing 141 provided outside the flange tube 120 and provided with an inlet through which fluid is introduced into the upper portion and an outlet through which fluid is discharged from the lower portion, (Not shown) rotatable by the flow of the biogas flowing through the inlet of the casing 141, an impeller shaft-coupled to the inside of the flange tube 120 to be coupled to the rotating body 131, And a rotary joint 149 for connecting the rotary shaft 147 and the ozone injection pipe 65. The rotary joint 149 has one side connected to the inside of the flap tube 120 and the other side connected to the inlet of the casing 141 A first biogas diesel pipe 143 connected to an outlet of the casing 141 and having one end connected to the inside of the flange pipe 120, The biogas that has passed through the casing 141 flows into the inside of the flange tube 120 And a second biogas diesel oil pipe 145 to be introduced thereinto.

The casing 141 is formed in a cylindrical shape. The casing 141 has an inlet connected to the first biogas diesel pipe 143 and an outlet connected to the second biogas diesel pipe 145 at a lower portion of the casing 141.

A rotation shaft 147 is provided inside the casing 141. The rotary shaft 147 is rotatably supported by the casing 141. The rotary shaft 147 is formed in a hollow structure with an empty interior. One side of the rotating shaft 147 extends into the inside of the flange tube 120 and is coupled to the rotating body 131. The other side of the rotary shaft 147 is connected to the ozone injection pipe 65 by a rotary joint 149.

The impeller is axially coupled to the rotating shaft 147 and installed inside the casing 141. Although not shown, the impeller consists of a boss coupled to the rotating shaft 147 and a plurality of blades radially formed on the outer circumferential surface of the boss.

One side of the first biogas light pipe 143 is connected to the flange tube 120 and the other side is connected to the inlet of the casing 141. One end of the second biogas light pipe 145 is connected to the outlet of the casing 141 and the other end is connected to the flange pipe 120.

A part of the biogas passing through the flange pipe 120 flows into the first biogas diesel pipe 143 and passes through the inside of the casing 141 and then passes through the second biogas diesel oil pipe 145 to the flange pipe 120 ). At this time, a rotational force for rotating the impeller is generated by the kinetic energy of the biogas passing through the casing 141. The generated rotational force is transmitted to the rotating body 131 through the rotating shaft 147. Accordingly, the rotating body 131 rotates inside the flange tube 120 and ejects ozone through the spray tube 135. Since the ozone is ejected through the rotating spray pipe 135, the mixing effect of the biogas and ozone passing through the flange pipe 120 can be improved, and the oxidative decomposition effect of hydrogen sulfide and other odor substances by ozone is greatly enhanced .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

1: Biogas inflow tube 10: Wash tower
15: Processed biogas discharge pipe 20: Mixed chemical liquid storage tank
31: first injection nozzle 33: second injection nozzle
40: first chemical liquid replenishing tank 41: first supplement pipe
50: second chemical liquid replenishing tank 51: second supplement pipe

Claims (4)

A pretreatment unit for removing foreign substances in the biogas containing hydrogen sulfide;
And a hydrogen sulfide removing unit for contacting the biogas having passed through the pretreatment unit with the mixed chemical liquid to remove hydrogen sulfide in the biogas,
Wherein the mixed chemical liquid is formed by mixing any one of the first chemical liquid selected from a sodium hydroxide solution and a potassium hydroxide solution and any one second chemical liquid selected from a sodium hypochlorite solution and a sodium oxide solution,
Wherein the hydrogen sulfide removal unit comprises a cleaning tower in which the biogas that has passed through the pretreatment unit flows downward and is discharged to an upper portion thereof and a chemical liquid supply unit for spraying the mixed chemical liquid into the cleaning tower,
The chemical liquid supply means includes a mixed chemical liquid storage tank installed at a lower portion of the washing tower and connected to the inside of the washing tower to store the mixed chemical liquid, and a mixed chemical liquid storing tank connected to the mixed chemical liquid storing tank, A first and a second injection nozzles which are vertically spaced apart from each other in the washing tower and inject mixed chemical liquid supplied through the mixed chemical liquid supply tube into the washing tower; First and second branch nozzles branching from the first and second injection nozzles and respectively connected to the first and second injection nozzles, first and second check valves provided respectively to the first and second branch nozzles, Either or both of the pH value and the redox potential value of the mixed chemical liquid flowing into the first and second spray nozzles are supplied to the first and second chemical liquids by simultaneously or selectively supplying the first chemical liquid and the second chemical liquid to the two- Comprising a chemical liquid supplement for regulating the time, and
The chemical liquid replenishing section includes a first chemical liquid replenishing tank storing the first chemical liquid, a first replenishing pipe connecting the first chemical replenishing tank and the first branch pipe, and a second replenishing pipe provided in the first replenishing pipe, A first chemical replenishing pump for transferring the first chemical liquid stored in the replenishing tank to the first branch, a second chemical liquid replenishing tank for storing the second chemical liquid, and a second chemical liquid replenishing tank for connecting the second chemical replenishing tank and the second branch pipe A second replenishment pump installed in the second replenishment pipe for moving the second chemical liquid stored in the second chemical liquid replenishing tank to the second distributor; Closing control means for simultaneously or selectively opening and closing the flow path of the air-
Closing control means includes a first valve installed in the first supplement pipe for controlling the pH of the mixed chemical liquid supplied to the first injection nozzle by introducing the first chemical liquid into the first branch pipe, And a second valve installed in the tube for controlling the redox potential of the mixed chemical liquid supplied to the second injection nozzle by introducing the second chemical liquid into the second branch tube. delete [Claim 2] The method of claim 1, wherein the pretreatment unit comprises: a biogas inlet pipe connected to the washing tower to introduce biogas into the washing tower; a filter type dust collector installed in the biogas inlet pipe to remove dust in the biogas; An ozone injection pipe connected to the biogas inlet pipe for injecting ozone into the biogas passing through the biogas inlet pipe, and an ozone generator connected to the ozone injection pipe to supply ozone, Biogas desulfurization unit. The ozone generator according to claim 3, wherein the biogas inlet pipe and the ozone injection pipe are connected by a connecting means,
The connecting means includes a flange tube coupled to the biogas inlet pipe, a spray module installed in the flange tube to supply ozone through the ozone injection tube, and a rotating unit for rotating the spray module ,
Wherein the injection module includes a cylindrical rotating body having a hollow interior and a plurality of discharge tubes formed at a predetermined interval on an outer surface of the rotating body to discharge ozone flowing into the rotating body into the inside of the flange tube,
The rotation unit includes a casing installed outside the flange tube and provided with an inlet through which fluid is introduced into an upper portion and an outlet through which fluid is discharged at a lower portion, A rotary shaft which is axially coupled to the impeller and extends to the inside of the flange tube and is coupled with the rotary body and hollow inside; a rotary joint that connects the rotary shaft and the ozone injection tube; A first biogas diesel tube having one side connected to the inside of the flange tube and the other side connected to an inlet of the casing to introduce biogas flowing in the inside of the flange tube into the casing; And the other side is connected to the inside of the flange tube, and the biogas that has passed through the casing is connected to the outlet And a second biogas diesel pipe for introducing the biogas gas into the inside of the flange pipe.

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