KR20230126271A - Digestive gas recycling system - Google Patents

Abstract

The present invention relates to a digestive gas recycling system and, more specifically, to a digestive gas recycling system including a digestion tank, a desulfurization device, a gas holder, and a surplus gas combustor to recycle, as a heat source, the digestive gas generated in the process of reducing sludge generated in a sewage treatment plant or the like. An embodiment of the present invention provides the digestive gas recycling system, comprising: a digestion tank (1) in which wastewater (material containing sludge generated in sewage treatment plants or the like) is decomposed to generate digestive gas containing methane (CH_4), carbon dioxide (CO_2), nitrogen (N_2), and hydrogen sulfide (H_2S); a desulfurization device (2) removing a sulfur component and moisture from the digestive gas generated in the digestion tank (1); a gas holder (3) storing the digestive gas from which the sulfur component and the moisture have been removed; a boiler that receives the digestive gas from the gas holder (3) to combust the same; and a surplus gas combustor (4) that burns surplus gas remaining after combustion in the boiler.

Description

Digestive gas recycling system

The present invention relates to a digestion gas recycling system, and more particularly, to recycling a digestion gas generated in a process of reducing sludge generated in a sewage treatment plant, etc. It is about a gas recycling system.

In general, wastewater generated from a sewage treatment plant contains a large amount of residues (sludge) such as organic matter.

If wastewater containing these residues is discharged in a state where biological and chemical oxygen demand and suspended solids content do not reach environmental standards, soil or water quality will be polluted.

Accordingly, environmental pollution is reduced by discharging wastewater residues (organic substances) into rivers in a purified state through biological, physical, and chemical treatment.

However, when organic substances in wastewater are treated by physical methods, the treatment effect is insignificant, and chemical treatment methods cause water pollution and require high treatment costs. Recently, biological methods using microorganisms are mainly used. .

Representative equipment used in the biological method includes a digestion tank, and after wastewater is introduced into the digestion tank, organic substances contained in the wastewater are treated by microorganisms.

On the other hand, in the process of treating organic materials as described above, methane gas, an environmentally friendly alternative energy source, is generated as a by-product. This methane gas is stored in a gas holder (gas tank) after removing hydrogen sulfide through a desulfurizer, and then used in a boiler or It is recycled as an energy source such as a generator. At this time, the reason why hydrogen sulfide contained in methane gas is removed through the desulfurizer is to prevent piping for transporting fluid or various related devices from being corroded by hydrogen sulfide in the process of using methane gas as an energy source.

Representative desulfurizers for removing the hydrogen sulfide include a wet desulfurizer and a dry desulfurizer.

The former wet desulfurizer is a device that uses the principle of desulfurization by ingesting hydrogen sulfide (H2S) by microorganisms inhabiting the equipment in the process of passing methane gas through the equipment called a cartrist scraper. However, the wet desulfurizer as described above requires a lot of manufacturing and installation costs, and has the disadvantage of requiring a wide installation place. In addition, there is a disadvantage that operation and maintenance are not easy due to a complicated structure.

The latter dry desulfurization machine is a device that removes hydrogen sulfide (H2S) by filling the desulfurization agent, which is a hydrogen sulfide adsorbent (Fe2O3), into the desulfurization tower.

However, the above dry desulfurization machine has a disadvantage in that the desulfurization efficiency is not very high and the desulfurization agent is frequently replaced.

That is, methane gas contains a large amount of moisture in addition to hydrogen sulfide. If the methane gas is passed through a dry desulfurizer without removing this moisture, the desulfurization agent retains moisture. As it is dissolved in the desulfurization efficiency, the desulfurization efficiency is drastically lowered, so there was a hassle of periodically replacing the desulfurization agent.

The applicant of the present invention has developed both a dry desulfurizer and a wet desulfurizer in accordance with such industrial needs, and a hybrid desulfurization in which dry and wet are mixed to compensate for the disadvantages of the dry and wet desulfurizer and improve desulfurization efficiency device was developed.

Korean Registered Patent No. 10-0963004 discloses a device for desulfurizing a fire extinguishing gas and regenerating a catalyst.

Although the patent document discloses a desulfurization device in which a monolithic desulfurization tank body is partitioned with partition walls, only a wet desulfurization process can be used in the desulfurization device.

In addition, the patent document only proposes a structure for recovering/regenerating the catalyst used in the wet desulfurization process, but does not suggest an invention in which dry and wet desulfurization devices are used together.

In addition, although the device of the patent document is connected to the 'tower' constituting the desulfurization tank, it is practically an invention in the form of attaching three towers, so it is difficult to reduce the volume of the entire device.

On the other hand, the conventional egg-shaped digestion tank adopts a structure in which a stirring blade rotating around a vertical central axis is driven by a drive motor to stir the sludge accumulated in the digestion tank, but the sludge present at the bottom of the digester is attached to the stirring blade Even if agitated by, the sludge present at the bottom of the digestion tank is insufficient to forcefully flow to the surface of the digestion tank, so the digestion efficiency is low because the up and down agitation is not properly performed.

In order to solve this problem, the screw is rotated by the motor installed in the digester, and the sludge present at the bottom of the digester can be forcibly pumped to the surface and stirred up and down, but even in the egg-shaped digester using the screw, the bottom of the digester is still Existing sludge is stagnant and has low digestion efficiency.

In order to solve this problem, the sludge can be agitated with a structure having a plurality of screws / blades, but the sludge is concentrated in the upper center of the digester by the screw, so the sludge is still stagnant, and a complicated structure for rotating the stirring blades As a result, the manufacturing cost of the digester and its operating cost increase.

In addition, the gas holder is a facility for temporarily storing digestion gas generated in a process of reducing sludge generated in a sewage treatment plant to be recycled as a heat source for boilers and fuel cells.

The gas holder is disclosed in Korean Patent Registration No. 10-0554202 filed and patented by the present applicant.

In the conventional gas holder, when any one of the plurality of wire ropes provided in the balancer is cut off, the piston deck is not evenly supported and collides with the inner wall of the tank, preventing it from moving up and down in an equilibrium state. There is a problem that it cannot be stored in the lower space or the gas cannot be properly discharged from the lower space to the outside of the tank,

If the membrane provided in the equalizer is torn, the gas introduced into the lower space flows into the upper space through the torn gap in the membrane, and the gas cannot be properly stored in the lower space. There is a problem of falling rapidly to the bottom of the tank by its own weight because it is not supported by

If the pressure of the gas introduced through the gas inlet is low, there is a problem that the inflow of the gas is hindered because the heavy piston deck cannot be lifted upward by the gas pressure,

In order to inspect the inside of the gas holder, the piston deck must remain in an upward position so that the operator can enter the inside of the gas holder and inspect the parts present in the space below the piston deck. However, if the membrane is torn or the wire is cut during inspection, There is a problem that the piston deck falls or slopes downward rapidly, resulting in injuries to workers on the piston deck or workers under the piston deck,

In order to prevent this, when the piston deck descends to the bottom of the tank by taking the gas present in the lower space out of the tank, there is a problem that the operator cannot inspect the bottom of the piston deck and the bottom of the tank.

The problem to be solved by the present invention is to improve the limitations of the components constituting the conventional digestion gas recycling system, to provide a digestion gas recycling system with improved overall performance.

Another problem to be solved by the present invention is to improve the desulfurization efficiency through a desulfurization device in which a dry desulfurization device and a wet desulfurization device are connected in series in order to improve the limitations of the conventional desulfurization device as described above, while improving the desulfurization efficiency of 1 An object of the present invention is to provide a wet-dry hybrid desulfurization device in which the overall volume of the device is greatly reduced by using a two-stage tower structure.

Another problem to be solved by the present invention is to provide a digester of a type capable of reducing manufacturing and operating costs of the digester while promoting sludge agitation in the digester.

Another problem to be solved by the present invention is to improve the equilibrium maintenance performance of the piston deck to provide a gas holder with improved gas storage performance, stability and maintainability.

In order to improve the limitations of the conventional digestion gas treatment apparatus as described above, the present invention decomposes wastewater to generate digestion gas containing methane (CH4), carbon dioxide (CO2), nitrogen (N2) and hydrogen sulfide (H2S). ; A desulfurization device for removing sulfur components and water from the digestion gas generated in the digestion tank; a gas holder for storing the extinguishing gas from which the sulfur component and moisture are removed; a boiler receiving and combusting the extinguishing gas supplied from the gas holder; It provides a digestive gas recycling system comprising a; and a surplus gas combustor for burning surplus gas remaining after being burned in the boiler.

In addition, the desulfurization device includes: a desulfurization tank that is sealed from the outside and provides a predetermined space to remove sulfur compounds from the digestion gas; a partition wall extending downward from the inner upper end of the desulfurization tank to divide the inside of the desulfurization tank into two sections; a first fire extinguishing gas inlet connected to a space on one side of the bulkhead; a first fire extinguishing gas outlet connected to the other side space based on the partition wall; Injectors provided in both spaces on the inside of the desulfurization tank on the basis of the partition wall; a wastewater tank connected to the lower end of the desulfurization tank; a sieve provided at the connection between the desulfurization tank and the wastewater tank; And an opening and closing door provided in both spaces based on the partition wall at the lower part of the desulfurization tank, and a dry desulfurization means and a wet desulfurization means are provided in both spaces based on the partition wall, respectively. Desulfurization efficiency can be improved. there is.

And, the desulfurization device: the first digestion gas inlet and the first digestion gas outlet are connected to the upper part of the desulfurization tank, so that the digestion gas introduced through the first digestion gas inlet passes through a space on one side with respect to the partition wall 1 Secondary desulfurization, digestion gas passing through the sieve located in the lower part of the one space passes through the sieve located in the lower part of the other space and flows into the other space, and the digestion gas introduced through the sieve is introduced into the other space with respect to the partition wall. Secondarily desulfurized through the, and the secondly desulfurized digestion gas may be configured to be discharged through the first digestion gas outlet.

In addition, the digestion tank includes: a digestion gas tank in which an internal space having a predetermined curvature is formed; a sludge inlet connected to an upper end of the digestion gas tank; a sludge outlet connected to the lower end of the digestion gas tank; a sludge circulation line provided as a pipe separate from the sludge inlet and sludge outlet and connected from the bottom of the digestion gas tank to the top of the digestion gas tank; a sludge pump provided on one side of the sludge circulation line to transfer sludge from the bottom to the top; a circular sludge nozzle pipe disposed at an upper end of the inside of the digestion gas tank and receiving sludge from the sludge circulation line and spraying it in a downward direction; a second extinguishing gas outlet connected to an upper end of the extinguishing gas tank; a extinguishing gas circulation line provided as a pipe separate from the second extinguishing gas outlet and connected from an upper portion of the extinguishing gas tank to a lower portion of the extinguishing gas tank; a fire extinguishing gas fan provided on one side of the fire extinguishing gas circulation line and transporting fire extinguishing gas from the top to the bottom; a scum outlet provided on the top of the fire extinguishing gas tank to discharge overflowing scum; a screw casing extending from the bottom to the top at the center of the fire extinguishing gas tank; a sludge screw accommodated in the screw casing so that the blade is in internal contact with the screw casing; A digestion tank (1) motor 173 provided at an upper end of the digestion gas tank to rotate the sludge screw; and a circular gas nozzle pipe disposed on one side or more of the extinguishing gas tank and receiving the extinguishing gas from the extinguishing gas circulation line and spraying it upward.

In addition, the gas holder includes: a gas holder tank formed to have a predetermined inner space; an air vent provided at an upper end of the gas holder tank; a third digestion gas inlet provided at a lower portion of the gas holder tank to receive a digestion gas from the desulfurization device; a third extinguishing gas outlet provided under the gas holder tank to supply the extinguishing gas; a membrane provided inside the gas holder tank and maintaining a predetermined airtight state such that the volume of the storage space connected to the third digestion gas inlet and the third digestion gas outlet varies according to the amount of digestion gas accommodated therein; A piston deck that maintains a predetermined equilibrium inside the gas holder tank and pressurizes the membrane by its own weight on top of the membrane; A plurality of deck pulleys disposed radially from the center of the piston deck; a tension adjusting device disposed on top of the gas holder tank to correspond to each of the deck pulleys; A stabilizer that maintains the equilibrium state of the piston deck; and a wire rope connected to the stabilizer.

And, the injection device includes: a spray pipe formed in a predetermined arc shape based on the center of the desulfurization tank formed in a predetermined cylindrical shape; and a plurality of jet nozzles radially formed in the lower portion of the jet pipe, and may be controlled to individually jet different liquids to spaces on both sides based on the partition wall.

In addition, a receiver connected to the first digestion gas inlet to remove moisture from the digestion gas flowing into the desulfurization tank; a solid desulfurization agent filled in the lower part of the space on one side connected to the first fire extinguishing gas inlet; Limestone filled in the upper part of the space on one side to which the first fire extinguishing gas inlet is connected; and a liquid desulfurization agent injected into the other space connected to the first extinguishing gas discharge port, thereby neutralizing the extinguishing gas from which moisture is primarily removed in the receiver by secondarily removing moisture through limestone, and removing moisture. First desulfurization is performed by adsorbing hydrogen sulfide from the digestion gas through a solid desulfurization agent, and second desulfurization can be performed through at least one of biological and chemical methods by spraying a liquid desulfurization agent to the first desulfurized digestion gas.

In addition, the desulfurization tank is formed in a funnel shape with a diameter decreasing toward the bottom to induce the liquid desulfurization agent to be collected in the wastewater tank, and the opening and closing door is formed on the outer circumferential surface of the funnel shape, and when opened, the solid desulfurization agent is induced to be discharged to the outside, and the strainer is formed to have a predetermined inclination from the bulkhead to the opening and closing door, so that the solid desulfurization agent can be induced to be discharged to the outside when the opening and closing door is opened.

According to an embodiment of the present invention, the desulfurization efficiency compared to the volume of the device can be remarkably improved by doubling the length of the path through which the digestion gas passes through the desulfurization device without changing the volume of the desulfurization tank.

In addition, the liquid desulfurization agent used in the wet desulfurization process can be moved back to the injection nozzle and reused, thereby reducing the consumption of the liquid desulfurization agent.

In addition, the digestion gas is transported downward in one space by a predetermined pressure difference and then transported to the upper part of the other space through the sieve, and the injected liquid desulfurization agent is naturally transferred to the wastewater tank due to its own weight and the structure/shape of the desulfurization tank. can be captured.

In addition, by adopting both the dry desulfurization process and the wet desulfurization process, while obtaining high desulfurization efficiency of the wet desulfurization machine, it is possible to partially reduce manufacturing and installation costs, and greatly reduce installation space.

In addition, by supplying the dry desulfurization process with moisture removed from the digestion gas, and supplying the digestion gas that has passed through the dry desulfurization process again to the wet desulfurization process, problems such as reduction in porosity and desulfurization efficiency of the solid desulfurization agent caused by moisture are prevented from occurring can do.

In addition, due to the structure of the desulfurization tank, the solid desulfurization agent can be discharged more easily, and overheating/fire due to contact between the solid desulfurization agent and air (oxygen) can be prevented by spraying water (cooling water) through a spray nozzle disposed inside the desulfurization tank. can do.

In addition, according to an embodiment of the present invention, hydrogen sulfide can be removed by 90% or more to discharge digestion gas of 50 ppm or less, and the replacement cycle of the solid desulfurization agent can be increased by 30% or more.

In addition, by using the conveying force of the screw and the pressure of the digestion gas, the sludge present in the digestion tank is stirred evenly from the upper center of the digestion tank to the lower part and from the upper part to the lower part of the rim of the digester, thereby increasing the digestion efficiency than before. can reduce manufacturing and operating costs.

1 is a system diagram showing a digestion gas recycling system according to an embodiment of the present invention.
2 is a view showing a digestion tank of a digestion gas recycling system according to an embodiment of the present invention.
3 is a view showing a gas holder of a digestion gas recycling system according to an embodiment of the present invention.
4 is a front view showing a wet-dry hybrid type desulfurization apparatus according to an embodiment of the present invention.
5 is a view showing a conventional dry desulfurization apparatus.
6 is a plan view showing a wet-dry hybrid type desulfurization apparatus according to an embodiment of the present invention.
7 is a front view showing a wet-dry hybrid desulfurization apparatus according to another embodiment of the present invention.
8 is a view showing a stabilizer of a gas holder of a digestive gas recycling system according to an embodiment of the present invention.

Hereinafter, various embodiments of this document will be described with reference to the accompanying drawings. However, this is not intended to limit the technology described in this document to specific embodiments, and should be understood to include various modifications, equivalents, and/or alternatives of the embodiments of this document. . In connection with the description of the drawings, like reference numerals may be used for like elements.

In this document, expressions such as "comprises" or "may include" indicate the presence of corresponding features (eg, components such as numerical values, functions, operations, or parts), and do not exclude the presence of additional features. don't

In this document, expressions such as “A or B,” “at least one of A and/and B,” or “one or more of A or/and B” may include all possible combinations of the items listed together. . For example, “A or B,” “at least one of A and B,” or “at least one of A or B” (1) includes at least one A, (2) includes at least one B, Or (3) may refer to all cases including at least one A and at least one B.

Expressions such as "first," "second," etc. used in this document may modify various elements, regardless of order and/or importance, and are only used to distinguish one element from another. The components are not limited. For example, a first user device and a second user device may represent different user devices regardless of order or importance. For example, without departing from the scope of rights described in this document, a first element may be called a second element, and similarly, the second element may also be renamed to the first element.

A component (e.g., a first component) is "(operatively or communicatively) coupled with/to" or "connected" to another component (e.g., a second component). When referred to as "connected to", it should be understood that the certain component may be directly connected to the other component or connected through another component (eg, a third component).

Terms used in this document are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted as having the same or similar meaning as the meaning in the context of the related art, and unless explicitly defined in this document, an ideal or excessively formal meaning. not be interpreted as In some cases, even terms defined in this document cannot be interpreted to exclude the embodiments of this document.

Of course, various modifications can be made by those skilled in the art without departing from the gist of the present invention claimed in the claims of the present invention, and these modifications are the technical spirit of the present invention or It should not be understood individually from the perspective.

The terms "top, bottom, top, bottom, left, right" and the like used in the description of the invention are defined based on the drawings, and the shape and position of each component are not limited by these terms.

According to an embodiment of the present invention, by decomposing wastewater (materials including sludge generated in a sewage treatment plant, etc.) to generate a digestion gas containing methane (CH4), carbon dioxide (CO2), nitrogen (N2) and hydrogen sulfide (H2S) digester (1); A desulfurization device (2) for removing sulfur components and moisture from the digestion gas generated in the digestion tank (1); a gas holder (3) for storing the extinguishing gas from which the sulfur component and moisture are removed; a boiler (not shown) for receiving and combusting the extinguishing gas supplied from the gas holder 3; and a surplus gas burner (4) for burning surplus gas remaining after being burned in the boiler.

The boiler may include a predetermined device that generates and utilizes energy by burning gas, such as a boiler, a generator, and a fuel cell.

The surplus gas combustor 4 can be continuously operated without being affected by the external environment through a combustion structure in a double casing furnace. As an air-cooled structure, it is possible to block radiant heat penetration from the outside through the air layer between the inside and outside. In addition, the air curtain effect prevents flames from being exposed to the outside to prevent fire accidents and damage to residential areas, and complete combustion and incineration of surplus gas prevents the emission of methane, the main culprit of greenhouse gases, and hydrogen sulfide, the cause of odor. can do.

In addition, the digestion tank 1 includes: a digestion gas tank 10 in which an internal space having a predetermined curvature is formed; a sludge inlet (11; wastewater inlet) connected to the upper end of the digestion gas tank (10); a sludge outlet 12 connected to the lower end of the digestion gas tank 10; A sludge circulation line 14 provided as a pipe separate from the sludge inlet 11 and the sludge outlet 12 and connected from the bottom of the digestion gas tank 10 to the top of the digestion gas tank 10; A sludge pump 140 provided on one side of the sludge circulation line 14 to transfer sludge from the bottom to the top; a circular sludge nozzle pipe (141) disposed at an inner upper end of the digestion gas tank (10) and receiving sludge from the sludge circulation line (14) and spraying it downward; a second extinguishing gas outlet 13 connected to an upper end of the extinguishing gas tank 10; a extinguishing gas circulation line 15 provided as a pipe separate from the second extinguishing gas outlet 13 and connected from an upper portion of the extinguishing gas tank 10 to a lower portion of the extinguishing gas tank 10; Extinguishing gas fan 150 provided on one side of the extinguishing gas circulation line 15 to transfer extinguishing gas from top to bottom; a scum outlet 16 provided on the top of the fire extinguishing gas tank 10 to discharge scum that overflows; a screw casing 171 extending from the bottom to the top at the center of the fire extinguishing gas tank 10; a sludge screw 172 accommodated in the screw casing 171 such that the blade is in internal contact with the screw casing 171; A digestion tank motor 173 provided at an upper end of the digestion gas tank 10 to rotate the sludge screw 172; and a circular gas nozzle pipe 151 disposed on at least one side of the extinguishing gas tank 10 and receiving the extinguishing gas from the extinguishing gas circulation line 15 and spraying it upward.

Through the vertical sludge screw 172 passing vertically through the middle of the digestion gas tank 10, the sludge deposited at the lower end of the digestion gas tank 10 is continuously transported to the upper part of the digestion gas tank 10 to stir the sludge .

Some of the sludge precipitated at the bottom of the digestion gas tank 10 is transported upward along the sludge circulation line 14 and sprayed downward through the circular sludge nozzle pipe 141, and the sprayed sludge hardens on the surface of the upper end of the sludge It breaks hardened scum and suppresses scum generation.

The digestion gas generated by the sludge agitation as described above flows into the second digestion gas outlet 13 and the digestion gas circulation line 15 at the top, and the digestion gas flowing into the digestion gas circulation line 15 is a digestion gas tank It is sprayed in the upper direction through the circular gas nozzle tube 151 disposed at the central and lower parts of (10) to accelerate the agitation of the sludge.

The fire extinguishing gas tank 10 may be formed in a predetermined 'egg shape (oval shape)'.

According to this configuration, there is almost no blind spot due to sludge agitation, so the agitation efficiency is very high, and accordingly, the decomposition rate (digestion gas generation rate) is increased.

The sludge pump 140 and the digestion gas fan 150 may be driven by energy generated by the digestion gas.

In addition, the gas holder 3 includes: a gas holder tank 30 formed to have a predetermined inner space; an air vent (313) provided at an upper end of the gas holder tank (30); a third digestion gas inlet 311 provided under the gas holder tank 30 to receive digestion gas from the desulfurization device 2; a third extinguishing gas outlet 312 provided under the gas holder tank 30 to supply the extinguishing gas; It is provided inside the gas holder tank 30, and the volume of the storage space connected to the third extinguishing gas inlet 311 and the third extinguishing gas outlet 312 varies according to the amount of extinguishing gas accommodated therein. Membrane 32 that maintains an airtight state; A piston deck 33 maintaining a predetermined equilibrium inside the gas holder tank 30 and pressurizing the membrane 32 by its own weight at the top of the membrane 32; A plurality of deck pulleys 341 radially disposed from the center of the piston deck 33; a tension adjusting device 342 disposed at an upper end of the gas holder tank 30 to correspond to each of the deck pulleys 341; A stabilizer 343 for maintaining the equilibrium state of the piston deck 33; and a wire rope 344 connected to the stabilizer 343.

The number of wire ropes 344 is preferably 4 to 6.

The stabilizer 343 includes: a hollow outer frame 3431 having a predetermined space therein; a hollow inner frame 3432 concentric with the cross section of the outer frame 3431 and formed to have a cross section with a diameter smaller than that of the outer frame 3431; an outer upper pulley 3433 disposed on top of the outer frame 3431; an outer lower pulley 3434 disposed at the lower end of the space between the outer frame 3431 and the inner frame 3432; an inner upper pulley 3435 disposed on top of the inner frame 3432; an inner lower pulley 3436 disposed at a lower end of the inner frame 3432; A deck bottom pulley (3437) disposed on the bottom surface of the piston deck (33); a tank lower pulley 3438 disposed at the lower end of the gas holder tank 30; And a wire rope fixing part 3439 disposed on the lower wall of the gas holder tank 30; including, the deck pulley 341, the outer upper pulley 3433, the outer lower pulley 3434, and the inner upper pulley 3435, inner lower pulley 3436, deck bottom pulley 3437, tank lower pulley 3438 and wire rope fixing part 3439 are provided one set for each wire rope 344, and the wire rope ( 344) is: deck pulley 341, outer upper pulley 3433, outer lower pulley 3434, inner upper pulley 3435, inner lower pulley 3436, deck bottom pulley (from the tension adjusting device 342) 3437) and the tank lower pulley 3438, and the end may be configured to be fixed to one side (3439; wire rope fixing part) of the lower part (near the lower part) inside the gas holder tank 30.

According to the structure as described above, an angle of 0.1 degrees (degree) can be maintained in the equilibrium test when the piston deck 33 is raised and lowered.

The membrane 32 may have a triple structure in which chloroprene rubber (CR) fabric is laminated on both sides of a nonwoven fabric, and the membrane 32 having excellent durability and tensile strength can be configured through this material. In the embodiment of the present invention, the tensile strength of the membrane 32 was measured to be 61 kN/m, and the elongation at the time of cutting was confirmed to be 13%.

The gas holder 3 may be provided with an automatic safety valve, a spark arrestor, a lightning rod, a pressure gauge, a tension damping device, a ventilation hole, a safety handrail, a level indicator, an inspection walkway, and a drain valve.

According to an embodiment of the present invention, the desulfurization tank 20 is sealed from the outside and provides a predetermined space to remove sulfur compounds from the digestive gas (G); a partition wall 201 extending downward from the inner upper end of the desulfurization tank 20 to divide the inside of the desulfurization tank 20 into two sections; a first fire extinguishing gas inlet 21 connected to one side space 202 (left space) based on the partition wall 201; a first extinguishing gas outlet 22 connected to the other side space 203 (right side space) based on the partition wall 201; Injection devices 23 respectively provided in both spaces (left space and right space) with respect to the partition wall 201 at the inner upper portion of the desulfurization tank 20; A wastewater tank 24 connected to the lower end of the desulfurization tank 20; a strainer 25 provided at the connection between the desulfurization tank 20 and the wastewater tank 24; and opening and closing doors 26 respectively provided in both spaces with respect to the partition wall 201 at the lower part of the desulfurization tank 20; Provided is a wet-dry hybrid type desulfurization apparatus (2) that improves desulfurization efficiency by having desulfurization means, respectively.

The structure is a 'one tower, two stage' structure, and is a structure in which a partition wall 201 is provided inside a desulfurization tank 20 having the size of a conventional desulfurization tank.

The strainer 25 may refer to a member having a structure that allows certain gases and liquids to pass through but prevents solids (powder, etc.; solid desulfurization agent, limestone) from passing through. It is preferable to fill the solid desulfurization agent 272 and limestone 271 having an appropriate powder/particle size so that the solid desulfurization agent 272 and limestone 271 do not flow into the wastewater tank 24 .

The injection device 23 may be configured to receive fluid through pipes independent of each other. For example, a pipe supplying water (cooling water) may be connected to the left space where the dry desulfurization means is provided, and a pipe supplying the liquid desulfurization agent 273 may be connected to the right space where the wet desulfurization means is provided.

A liquid desulfurization agent 273 (microorganisms, chemicals (NaOH, etc.)) may be used as the wet desulfurization means, and a solid desulfurization agent 272 (hydrogen sulfide adsorbent, etc.) may be used as the dry desulfurization means.

Hereinafter, a conventional dry desulfurization apparatus 2 shown in FIG. 5 and a wet-dry hybrid desulfurization apparatus 2 according to an embodiment of the present invention shown in FIG. 1 are compared.

Referring to FIG. 5, in the conventional dry desulfurization device 2, in a state in which the solid desulfurization agent 272 is filled in the desulfurization tank 20, digestion gas G is supplied through the first digestion gas inlet 21 provided at the bottom. be supplied At this time, the digestion gas (G) passing through the solid desulfurization agent 272 exits through the first digestion gas outlet 22 connected to the upper part of the desulfurization tank 20.

On the other hand, in the present invention, the first digestion gas inlet 21 is disposed above the desulfurization tank 20, and through this, the digestion gas G is desulfurized while moving once from the top to the bottom of the desulfurization tank 20 It has a structure that desulfurizes once more while moving from the bottom to the top again.

As the digestion gas (G) continuously flows into the desulfurization tank 20, the digestion gas (G) that has flowed in first may be pushed toward the first digestion gas outlet 22, and the waste water tank 24 provided at the bottom The used liquid desulfurization agent 273 is accumulated. Accordingly, the extinguishing gas (G) can be discharged in the direction of the first extinguishing gas outlet 22 without being trapped in the waste water tank 24 .

Separately, a pump may be connected to the first extinguishing gas inlet 21 or/and the first extinguishing gas outlet 22 to facilitate the transfer of the extinguishing gas G. By controlling the flow rate/flow rate of the digestion gas G, the reaction time of the digestion gas G with the desulfurization agent can be controlled, and accordingly, the desulfurization efficiency and the desulfurization treatment time can be appropriately adjusted.

The injection device 23 is disposed in both the left space and the right space, but when the desulfurization process is in progress, only the liquid desulfurization agent 273 is injected from the injection device 23 in the right space, and the injection device 23 in the left space It can be controlled so that it does not work. Due to this method and structure, only the used liquid desulfurization agent 273 can be accumulated in the waste water tank 24.

The injection device 23 in the left space may be operated while removing the solid desulfurization agent 272 from the desulfurization tank 20 (left space) after the desulfurization process is finished.

When air (oxygen) comes into contact with the solid desulfurization agent 272, a fire may occur due to an exothermic reaction. Therefore, a fire in the step of removing the solid desulfurization agent 272 can be prevented by lowering the temperature by spraying cooling water therein. .

A predetermined sampling nozzle may be provided at the first digestion gas inlet 21 and/or the first digestion gas outlet 22 .

A predetermined rotary valve 28 is provided in the opening and closing door 26 to automate the discharge of the solid desulfurization agent 272.

An upper opening/closing door for maintenance may be provided at an upper end of the desulfurization tank 20, and the solid desulfurization agent 272 may be supplied to one or both sides of the bulkhead 201 by opening the upper opening/closing door.

A predetermined pipe, a filter device, a liquid desulfurization agent regeneration device, a circulation pump, and the like may be connected to the wastewater tank 24 . Through this structure, the collected liquid desulfurization agent 273 can be supplied to the injector 23 again or supplied to the injector 23 through a filter device, a regenerator, and the like.

In addition, the injection device 23 includes: an injection pipe 231 formed in a predetermined arc shape based on the center of the desulfurization tank 20 formed in a predetermined cylindrical shape; and a plurality of injection nozzles 232 formed radially under the injection pipe 231, which can be controlled to individually inject different liquids into spaces on both sides of the partition wall 201, respectively. there is.

As described above, water can be sprayed to prevent fire in the process of removing the solid desulfurization agent 272 on one side equipped with a dry desulfurization means, and on the other side equipped with a wet desulfurization means, a desulfurization tank for wet desulfurization treatment (20) The liquid desulfurization agent 273 may be injected into the inner space (right space).

The injection nozzle 232 may be connected to the first nozzle pipe 233 and the second nozzle pipe 234 to receive water or/and liquid desulfurization agent 273, respectively.

In addition, the first digestion gas inlet 21 and the first digestion gas outlet 22 are connected to the upper part of the desulfurization tank 20, and the digestion gas (G) introduced through the first digestion gas inlet 21 The digestion gas G, which is first desulfurized through one side space 202 based on the partition wall 201 and passed through the sieve 25 located at the bottom of the one side space 202, is the other side space 203 Passing through the strainer 25 located at the lower part and flowing into the other space 203, the digestive gas G introduced through the strainer 25 passes through the other space 203 based on the partition wall 201 to the secondary secondary space 203. The desulfurized and secondary desulfurized digestion gas (G) may be configured to be discharged through the first digestion gas outlet 22 .

Through the structure as described above, it is possible to construct an apparatus in which a multi-stage desulfurization process is performed using a single tower without connecting several towers in series or parallel.

In addition, a receiver connected to the first digestion gas inlet 21 to remove moisture from the digestion gas G flowing into the desulfurization tank 20; a solid desulfurization agent 272 filled in the lower part of the space 202 to which the first fire extinguishing gas inlet 21 is connected; Limestone 271 filled in the upper part of the space 202 on one side to which the first fire extinguishing gas inlet 21 is connected; and a liquid desulfurization agent 273 sprayed into the other side space 203 to which the first extinguishing gas outlet 22 is connected, so that the extinguishing gas (G) from which moisture is primarily removed in the receiver is converted into limestone 271. Secondary desulfurization is performed by adsorbing hydrogen sulfide from the desulfurized digestion gas (G) through the solid desulfurization agent 272, and the first desulfurization is performed, and the liquid desulfurization agent ( 273) to perform secondary desulfurization through at least one of biological and chemical methods.

The order in which the dry desulfurization means and the wet desulfurization means are applied may be changed. For example, the digestion gas (G) from which a predetermined amount of moisture has been removed through the receiver is first desulfurized by a wet desulfurization means, and the sulfur component remaining in the primarily desulfurized digestion gas (G) is desulfurized by using a dry desulfurization means It can also be configured in a way to remove it.

However, in the above embodiment, the digestion gas (G) passing through the receiver and the limestone 271 is configured to sequentially contact the solid desulfurization agent 272 and the liquid desulfurization agent 273 to prevent problems such as desulfurization efficiency due to moisture. are doing

By neutralizing the digestion gas (G) through the limestone 271, it is possible to prevent corrosion of metal parts.

In addition, the desulfurization tank 20 is formed in a funnel shape whose diameter decreases toward the bottom, and induces the liquid desulfurization agent 273 to be collected in the wastewater tank 24, and the opening and closing door 26: It is formed on the funnel-shaped outer circumferential surface to induce the solid desulfurization agent 272 to be discharged to the outside when opened, and the strainer 25 is formed to have a predetermined inclination from the bulkhead 201 to the opening and closing door 26 When the opening and closing door 26 is opened, the solid desulfurization agent 272 may be induced to be discharged to the outside.

Through the above structure, the solid desulfurization agent 272 can be more easily removed. In a conventional device, an operator directly removes the solid desulfurization agent 272 from the horizontally configured opening and closing door 26 using a tool such as a shovel, but according to an embodiment of the present invention, the solid desulfurization agent 272 from the desulfurization tank 20 The solid desulfurization agent 272 is easily removed, and the operation of removing the solid desulfurization agent 272 becomes very easy.

G: digestive gas
1: digester
10: fire extinguishing gas tank
11: sludge inlet
12: sludge outlet
13: 2nd digestion gas outlet
14: sludge circulation line
140: sludge pump
141: circular sludge nozzle pipe
15: digestion gas circulation line
150: fire extinguishing gas fan
151: circular gas nozzle pipe
16: scum outlet
171: screw casing
172: sludge screw
173: digester motor
2: desulfurization device
20: desulfurization tank
201: bulkhead
202: one side space (left space)
203: other space (right space)
21: first digestion gas inlet
22: first digestion gas outlet
23: injector
231: injection pipe
232: injection nozzle
233: first nozzle pipe
234: second nozzle pipe
24: waste water tank
25: strainer
26: opening and closing door
271: Limestone
272: solid desulfurization agent
273: liquid desulfurization agent
28: rotary valve
3: gas holder
30: gas holder tank
311: third fire extinguishing gas inlet
312: 3rd fire extinguishing gas outlet
313: air vent
32: membrane
33: piston deck
341: deck pulley
342: tension control device
343: stabilizer
3431: external frame
3432: inner frame
3433: outer top pulley
3434: outer lower pulley
3435: inner top pulley
3436: inner lower pulley
3437: deck bottom pulley
3438: tank bottom pulley
3439: wire rope fixing part
344: wire rope
4: surplus gas burner

Claims (5)

A digestion tank that decomposes wastewater to produce a digestion gas containing methane (CH4), carbon dioxide (CO2), nitrogen (N2) and hydrogen sulfide (H2S);
A desulfurization device for removing sulfur components and water from the digestion gas generated in the digestion tank;
a gas holder for storing the extinguishing gas from which the sulfur component and moisture are removed;
a boiler receiving and combusting the extinguishing gas supplied from the gas holder; and
A extinguishing gas recycling system comprising a; surplus gas burner for burning surplus gas remaining after being burned in the boiler The method of claim 1,
The desulfurization device:
A desulfurization tank that is sealed from the outside and provides a predetermined space to remove sulfur compounds from the digestion gas;
a partition wall extending downward from the inner upper end of the desulfurization tank to divide the inside of the desulfurization tank into two sections;
a first fire extinguishing gas inlet connected to a space on one side of the bulkhead;
a first fire extinguishing gas outlet connected to the other side space based on the partition wall;
Injectors provided in both spaces on the inside of the desulfurization tank on the basis of the partition wall;
a wastewater tank connected to the lower end of the desulfurization tank;
a sieve provided at the connection between the desulfurization tank and the wastewater tank; and
Including; opening and closing doors respectively provided in both spaces with respect to the partition wall at the lower part of the desulfurization tank,
Digestive gas recycling system that improves desulfurization efficiency by providing a dry desulfurization means and a wet desulfurization means in both spaces based on the bulkhead, respectively The method of claim 2,
The desulfurization device:
The first digestion gas inlet and the first digestion gas outlet are connected to the upper part of the desulfurization tank,
The digestion gas introduced through the first digestion gas inlet is first desulfurized through one side space based on the partition wall,
The digestion gas passing through the sieve located in the lower part of the one space passes through the sieve located in the lower part of the other space and flows into the other space,
The digestion gas introduced through the sieve is desulfurized secondarily through the other side space based on the partition wall,
A digestive gas recycling system configured to discharge the secondary desulfurized digestive gas through a first digestive gas outlet. The method of claim 1,
The digester is:
A fire extinguishing gas tank in which an internal space having a predetermined curvature is formed;
a sludge inlet connected to an upper end of the digestion gas tank;
a sludge outlet connected to the lower end of the digestion gas tank;
a sludge circulation line provided as a pipe separate from the sludge inlet and sludge outlet and connected from the bottom of the digestion gas tank to the top of the digestion gas tank;
a sludge pump provided on one side of the sludge circulation line to transfer sludge from the bottom to the top;
a circular sludge nozzle pipe disposed at an upper end of the inside of the digestion gas tank and receiving sludge from the sludge circulation line and spraying it in a downward direction;
a second extinguishing gas outlet connected to an upper end of the extinguishing gas tank;
a extinguishing gas circulation line provided as a pipe separate from the second extinguishing gas outlet and connected from an upper portion of the extinguishing gas tank to a lower portion of the extinguishing gas tank;
a fire extinguishing gas fan provided on one side of the fire extinguishing gas circulation line and transporting fire extinguishing gas from the top to the bottom;
a scum outlet provided on the top of the fire extinguishing gas tank to discharge overflowing scum;
a screw casing extending from the bottom to the top at the center of the fire extinguishing gas tank;
a sludge screw accommodated in the screw casing so that the blade is in internal contact with the screw casing;
A digestion tank (1) motor 173 provided at an upper end of the digestion gas tank to rotate the sludge screw; and
A fire extinguishing gas recycling system comprising a; circular gas nozzle pipe disposed on at least one side of the fire extinguishing gas tank and receiving the fire extinguishing gas from the fire extinguishing gas circulation line and spraying it upwards The method of claim 1,
The gas holder is:
a gas holder tank formed to have a predetermined inner space;
an air vent provided at an upper end of the gas holder tank;
a third digestion gas inlet provided at a lower portion of the gas holder tank to receive a digestion gas from the desulfurization device;
a third extinguishing gas outlet provided under the gas holder tank to supply the extinguishing gas;
a membrane provided inside the gas holder tank and maintaining a predetermined airtight state such that the volume of the storage space connected to the third digestion gas inlet and the third digestion gas outlet varies according to the amount of digestion gas accommodated therein;
A piston deck that maintains a predetermined equilibrium inside the gas holder tank and pressurizes the membrane by its own weight on top of the membrane;
A plurality of deck pulleys disposed radially from the center of the piston deck;
a tension adjusting device disposed on top of the gas holder tank to correspond to each of the deck pulleys;
A stabilizer that maintains the equilibrium state of the piston deck; and
A fire extinguishing gas recycling system comprising a; wire rope connected to the stabilizer

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