KR102536367B1 - Biogas reformer - Google Patents

Abstract

An object of the present invention is to provide a reformer for biogas that solves the reaction equivalence ratio of an external heat source and CO ₂ :CH ₄ in a catalytic dry reforming reaction. In the biogas reforming apparatus according to an embodiment of the present invention, a first amount of a biogas feed mainly composed of methane and carbon dioxide is introduced into an inlet to discharge carbon monoxide and hydrogen reformed syngas through an outlet. A housing, an inner housing disposed inside the outer housing and having one end open from the inside of the outer housing, a catalytic reaction unit provided between the inner housing and the outer housing and communicating to the outlet, and provided in the inner housing Plasma for forming a flame by plasma discharge by the second portion of the oxidizer and the feed, excluding the first portion, to heat the inner housing, and supplying combustion emissions in which methane is reduced and carbon dioxide is increased in the second portion to the inlet side. includes a burner

Description

Biogas reformer {BIOGAS REFORMER}

The present invention relates to a reformer of biogas, and more particularly, to a reformer of biogas that enables ignition and flame maintenance of biogas under low calorific value and fluctuating feed supply conditions.

As is known, as reduction of greenhouse gases has become an important issue, research to convert biogas composed of greenhouse gases into syngas and use them as fuel, alcohol, hydrogen, etc. is becoming active.

On the other hand, the main components of biogas are CO ₂ and CH ₄ , and CO ₂ and CH ₄ can be converted into syngas containing hydrogen through a dry reforming process, that is, CO ₂ + CH ₄ -> 2CO + 2H ₂ . However, since the amount of CH ₄ is higher than that of CO ₂ in normal biogas, when the direct reforming process is performed, excess CH ₄ is discharged into the atmosphere.

In addition, in the case of dry reforming, external heat must be continuously supplied to the reactor to maintain the reaction due to strong endothermic reaction characteristics. In this process, if CO ₂ is generated to supply an external heat source, the carbon reduction effect of biogas reforming is lowered.

In the case of a general dry reforming reaction, the supply of an external heat source is required. In the case of a general catalytic dry reforming reaction, the amount of CO ₂ is increased in the range of CO ₂ :CH ₄ = 1:1 to 2:1 to promote the reaction. However, in the case of biogas, on the contrary, the amount of CH ₄ is greater than that of CO ₂ , and disadvantages in this reaction occur.

Korean Patent Publication No. 2018-0116952 provides a reforming concept of a plasma catalyst method, but fails to disclose a method in which heat by a plasma burner can be effectively transferred to a catalyst reactor.

On the other hand, when heat is supplied by burning biogas, which is a feed, the calorific value is not as high as 4,000 to 5,000 kcal/m ³ depending on the composition of the biogas, and the feed with frequent changes in composition and flow rate ), the combustion becomes unstable due to the characteristics of

An object of the present invention is to provide a reformer for biogas that solves the reaction equivalence ratio of an external heat source and CO ₂ :CH ₄ in a catalytic dry reforming reaction.

An object of the present invention is to enable ignition and flame maintenance of biogas under low calorific value and fluctuating feed supply conditions in a dry reforming process of a plasma catalyst method, and to reduce the amount of heat required for a catalytic reaction without supplying an external heat source. It is to provide a reformer of biogas to be supplied.

An object of the present invention is to convert CH ₄ to CO ₂ in a combustion process that maintains a flame to adjust the CO ₂ :CH ₄ reaction equivalence ratio of feed to a value between 1:1 and 2:1 appropriate for the catalytic reaction. It is to provide a reforming device for gas.

An object of the present invention is to provide a reformer of biogas that enables heat to be effectively transferred when heat is transferred from a plasma burner to a catalytic reaction unit.

An object of the present invention is to provide a reformer for biogas that detects a change in the amount of heat required for a catalytic reaction unit and supplies a fluctuating amount of heat to the catalytic reaction unit.

In the biogas reforming apparatus according to an embodiment of the present invention, a first amount of a biogas feed mainly composed of methane and carbon dioxide is introduced into an inlet to discharge carbon monoxide and hydrogen reformed syngas through an outlet. A housing, an inner housing disposed inside the outer housing and having one end open from the inside of the outer housing, a catalytic reaction unit provided between the inner housing and the outer housing and communicating to the outlet, and provided in the inner housing A flame is formed by plasma discharge by the second amount of the oxidizer and the feed remaining except for the first amount to heat the inner housing, and methane is reduced and carbon dioxide is increased in the second amount and a plasma burner supplying combustion exhaust to the inlet side.

The biogas reformer according to an embodiment of the present invention is connected to a first conduit for supplying the first amount to the inlet side of the outer housing and a branch point of the first conduit through a control valve, so that the second A second conduit for supplying the quantity to the plasma burner is further included.

The catalytic reaction unit may be positioned between an outer surface of the inner housing and an inner surface of the outer housing.

The inner housing may form an open end inside the inlet side of the outer housing.

The outer housing may further include a direction changing member that is provided in front of the open end of the inner housing on the inside of the inlet side and changes the direction of combustion emissions.

The feed of the first amount flowing into the inlet may be mixed with the direction-converted combustion exhaust and supplied to the catalytic reaction unit as it flows into the outer periphery of the direction-changing member.

Since combustion emissions are added to the first amount of feed supplied to the catalytic reaction unit, the ratio of carbon dioxide (CO ₂ ):methane (CH ₄ ) may be adjusted to 1:1 to 2:1.

The plasma burner includes a burner housing coupled to the inner housing and electrically grounded at the outlet side, and a high voltage applied to the burner housing to form a discharge gap and a feed passage connected to the second conduit. It may include an electrode that

The electrode includes a convex-shaped discharge part forming the discharge gap and a pillar part having a diameter smaller than that of the discharge part and connected to the discharge part, and the feed passage is connected to the second conduit and is connected to the pillar part. It may include a first inner passage formed, and a second inner passage connected to the first inner passage and formed in the discharge unit toward the burner housing.

The first inner passage may pass through the second inner passage and extend to the end of the discharge unit to eject combustion emissions toward the inlet.

The plasma burner may further include a swirler provided between the post portion and the burner housing at the rear of the discharge unit to generate a swirl in the oxidant supplied to the discharge gap.

The biogas reformer according to an embodiment of the present invention may further include a plasma reactor provided on the inlet side of the outer housing to heat a first amount of feed toward the inner housing.

The plasma reactor may be formed of one of arc jet plasma, high frequency inductively coupled plasma and microwave plasma.

The inner housing may have a through hole through which combustion exhaust is supplied to the catalytic reaction unit.

The through hole may be provided in plurality at the open end side.

The biogas reformer according to an embodiment of the present invention further includes an intermediate housing connected to the inner housing and spaced apart from the outer housing to form a circulation part in which combustion emissions circulate, and the catalytic reaction part is connected to the inner housing and It may be filled and positioned between the intermediate housings.

The plasma burner is coupled to the inner housing at the inlet side, the inner housing is closed at the outlet side and connected to the intermediate housing, and the outer housing forms a guide at the inlet side to circulate the circulation unit. Combustion emissions may be guided to the catalytic reaction unit.

As described above, one embodiment of the present invention further supplies raw materials to the catalytic reaction unit while supplying heat to the plasma burner using biogas as fuel, so that the required amount of heat can be supplied to the catalytic reaction unit without supplying an external heat source, and the supply amount fluctuates. Regarding this severe biogas, CO ₂ :CH ₄ reaction equivalence ratio is stably adjusted to enable a reforming reaction of biogas. Therefore, one embodiment converts biogas from a fuel into a raw material through a plasma burner and reforms the biogas in a catalytic reaction unit, thereby enabling CO ₂ reduction.

1 is a block diagram of a biogas reformer according to a first embodiment of the present invention.
FIG. 2 is a block diagram of a plasma burner used in the biogas reformer of FIG. 1 .
FIG. 3 is a block diagram of another plasma burner used in the biogas reformer of FIG. 1 .
4 is a block diagram of a biogas reformer according to a second embodiment of the present invention.
5 is a block diagram of a biogas reformer according to a third embodiment of the present invention.
6 is a block diagram of a biogas reformer according to a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

1 is a block diagram of a biogas reformer according to a first embodiment of the present invention. Referring to FIG. 1, the biogas reformer 100 of the first embodiment includes an outer housing 10, an inner housing 20, a catalytic reaction unit 30, and a plasma burner 40 to reform biogas into syngas. ).

The outer housing 10 forms a space containing the inner housing 20 and the catalytic reaction unit 30, and has an inlet 11 connected to one side of the space and an outlet 12 connected to the other side of the space.

The inlet 11 introduces a first amount of biogas feed mainly composed of methane (CH ₄ ) and carbon dioxide (CO ₂ ). The remaining second amount except for the first amount is introduced into the plasma burner 40 . The discharge port 12 discharges the reformed syngas containing carbon monoxide (CO) and hydrogen (H ₂ ) as main components of the first and second amounts of feed.

To this end, the biogas reformer 100 includes a first pipe 51, a second pipe 52, and a control valve 53. The first conduit 51 is connected to the inlet 11 of the outer housing 10 and supplies a first amount of the entire biogas feed to the inlet 11 side.

The second conduit 52 is connected to the branch point of the first conduit 51 via the control valve 53. The second conduit 52 connects the control valve 53 and the plasma burner 40 to supply a second amount of the feed to the plasma burner 40. The second amount of the feed acts as a fuel for the plasma burner 40 and is burned, then reformed as CO ₂ + CH ₄ -> 2CO + 2H ₂ and serves as a raw material for the catalytic reaction unit 30 .

For example, the first amount of the first conduit 51 is 75 to 80% of the biogas feed, and the second amount of the second conduit 52 is the remaining 10 to 25% of the vice gas feed, and the control valve 53 ) can be adjusted.

Biogas is mainly composed of CO ₂ and CH ₄ , and CO ₂ accounts for around 30-40% and CH ₄ accounts for 50-60%. In the case of a dry reforming reaction in which CO ₂ and CH ₄ are reacted to obtain CO and H ₂ , CO ₂ :CH ₄ = 1:1 to 2:1 under conditions where CO ₂ acting as an oxidizing agent is slightly more than CH ₄ It is advantageous to react. The dry reforming reaction to obtain CO and H ₂ by reacting CO ₂ and CH ₄ is a strong endothermic reaction and can be maintained only when external heat is continuously supplied.

The inner housing 20 is disposed inside the outer housing 10 and one end is open from the inside of the outer housing 10 . In the first embodiment, the open end of the inner housing 20 is formed open inside the inlet 11 side of the outer housing 10 .

The catalytic reaction unit 30 is provided between the inner housing 20 and the outer housing 10 and communicates with the outlet 12 side. In the first embodiment, the catalytic reaction unit 30 may be positioned between the outer surface of the inner housing 20 and the inner surface of the outer housing 10 .

The outer housing 10 further includes a support plate 14 interposed between the inner housing 20 and the lower side thereof. The support plate 14 is formed as a perforated plate to support the catalytic reaction unit 30 and allow the circulation of syngas including carbon monoxide and hydrogen reformed from methane and carbon dioxide in the feed through the discharge port 12 .

The plasma burner 40 is provided in the inner housing 20 to form a flame by plasma discharge by a second amount of an oxidizing agent and a feed to heat the inner housing 20 and reduce methane and increase carbon dioxide in the second amount It is configured to supply combustion emissions to the inlet 11 side.

When biogas is burned, the flame (F) may be unstable due to the low calorific value, fluid flow rate, and fluid composition of biogas. The plasma burner 40 can solve this instability of the flame.

The outer housing 10 further includes a direction changing member 13 on the inside of the inlet 11 side. The direction shifting member 13 is provided in front of the open end of the inner housing 20 and collides with the combustion exhaust proceeding toward the inlet 11 to change the traveling direction of the combustion exhaust toward the inner surface of the outer housing 10. let it

The first amount of feed flowing into the inlet 11 is introduced to the outside of the direction changing member 13 and is mixed with the direction-converted combustion exhaust and supplied to the catalytic reaction unit 30 . That is, combustion emissions containing CO and H ₂ converted in the feed of the second quantity are mixed with the biogas mainly composed of CO ₂ and CH ₄ of the first quantity and supplied to the catalytic reaction unit 30 .

Since combustion emissions are added to the first amount of feed supplied to the catalytic reaction unit 30, The ratio of carbon dioxide (CO ₂ ):methane (CH ₄ ) is adjusted to 1:1 to 2:1. At this time, since the amount of heat dissipated by the plasma burner 40 heats the inner housing 20 and the catalytic reaction unit 30, CO ₂ and CH ₄ are reacted to obtain CO and H ₂ .

Due to the nature of the endothermic reaction, the temperature at the rear end of the catalytic reaction unit 30, that is, at the discharge port 12, may be lower than the temperature at the front end of the catalytic reaction unit 30, that is, at the inlet 11 side. Considering this point, the plasma burner 40 installed at the rear end of the catalytic reaction unit 30 can increase the efficiency of the reforming reaction even at the rear end of the catalytic reaction unit 30 .

FIG. 2 is a block diagram of a plasma burner used in the biogas reformer of FIG. 1 . Referring to FIG. 2 , the plasma burner 40 includes a burner housing 41 and an electrode 42 . The burner housing 41 is coupled to the inner housing 20 at the outlet 12 side of the outer housing 10 and is electrically grounded. That is, the burner housing 41 is installed on the opposite side of the open end of the inner housing 20 and faces the open end.

The electrode 42 is built into the burner housing 41 and a high voltage (HV) is applied to form a discharge gap (G) and form a feed passage (43) connected to the second conduit (52). In addition, the electrode 42 includes a convex-shaped discharge part 421 forming a discharge gap G and a pillar part 422 formed longer with a smaller diameter than the discharge part 421 and connected to the discharge part 421. do. The pillar portion 422 is connected to the high voltage (HV) and installed in the burner housing 41 in an electrically insulated state through an insulating member 45 .

The feed passage 43 is connected to the second conduit 52 and is connected to the first inner passage 431 formed in the pillar portion 422, and the first inner passage 431 to direct the burner housing 41. A second inner passage 432 formed in the front part 421 is included.

The plasma burner 40 further includes a swirler 44. The swirler 44 is provided between the pillar part 422 and the burner housing 41 at the rear of the discharge part 421 to generate a swirl in the oxidizing agent of air or oxygen supplied to the discharge gap G, and the feed passage The second amount of feed supplied to (43) and the oxidizing agent are mixed with each other. The second amount of feed serves as fuel (CO ₂ , CH ₄ ) in the plasma burner 40 and then is reformed to serve as raw material ( CO, H ₂ ) of the catalytic reaction unit 30 .

A discharge gap G is set as the shortest distance between the discharge unit 421 and the burner housing 41 . A mixing zone (MZ) is formed between the swirler 44 and the discharge gap G, so that the swirler 44 induces the oxidizing agent, so that the biogas and the oxidizing agent are mixed in the mixing zone MZ. The swirler 44 and the mixing zone (MZ) enable the ignition of biogas under low calorific value and fluctuating feed supply conditions.

An ignition zone (IZ) is formed between the discharge gap G and the end of the burner housing 41, and an arc is generated in the mixed biogas and oxidant, and the generated arc develops to the inner housing 20. A flame F is ejected toward the open end. The swirler 44 and the ignition zone (IZ) enable the ignition of biogas and the maintenance of the flame under low calorific value and fluctuating feed supply conditions.

That is, the plasma burner 40 enables ignition after mixing. The electrode 42 is supplied to the swirling oxidizer before the ignition point to facilitate mixing of the biogas feed and the oxidizer, which act as fuel. The electrode 42 enables the arc to be used for ignition and flame stabilization so that biogas with low calorific value can be stably ignited and flame maintained. To this end, the electrode 42 generates an arc in the form of rotation in the wake of the swirler 44 for mixing.

As shown in FIG. 1, the flame F of the plasma burner 40 and the high-temperature combustion exhaust heat the inner housing 20 to indirectly heat the catalytic reaction unit 30, and It proceeds to the open end, is changed in direction by the direction changing member 13, and is guided to the catalytic reaction unit 30.

High-temperature combustion emissions (CO, H ₂ ) are mixed with the first amount of feed biogas (CH ₄ , CO ₂ ), which is a relatively low-temperature raw material, to raise the temperature and increase the CO ₂ :CH ₄ ratio of 1:1 to 2:1 adjusted to a range between The mixed feed (CH ₄ , CO ₂ ) is stably reformed in the catalytic reaction unit 30 . At this time, since the biogas is used as a fuel for the plasma burner 40 and converted into raw materials (CO, H ₂ ) of the catalytic reaction unit 30 , CO ₂ reduction is possible during biogas reforming.

At this time, the plasma burner 40 is installed inside the catalytic reaction unit 30, and the heat generated by the plasma burner 40 during the process of supplying combustion emissions to the catalytic reaction unit 30 is completely transferred to the catalytic reaction unit without loss. (30) can be supplied.

FIG. 3 is a block diagram of another plasma burner used in the biogas reformer of FIG. 1 . By comparing the plasma burner 40 of FIG. 2 and the plasma burner 240 of FIG. 3 , a description of the same configuration will be omitted and different configurations will be described.

In the feed passage 243, the first inner passage 433 passes through the second inner passage 432 and extends to the end of the discharge unit 421, so that combustion emissions are ejected in the longitudinal direction of the first inner passage 433.

The fuel supplied via the first inner passage 433, that is, the second quantity of biogas feed, is injected into the flame F of FIG. 2 and induces a longer diffusion flame F2 in the longitudinal direction. Since the first inner passage 433 extends to the end, it enables uniform heat transfer with respect to the inner housing 20 and the catalytic reaction unit 30 in the longitudinal direction.

In addition, since the first inner passage 433 is extended to the end, heat can be continuously transferred along the longitudinal direction of the catalytic reaction unit 30, and the second amount of biogas feed and oxidant in the longitudinal direction of the catalytic reaction unit 30 It is possible to further form a long diffusion flame (F2) by supplying. Through this fuel supply, a diffusion flame F2 is formed in the center based on the premixed flame F, thereby further stabilizing the flame.

Hereinafter, various embodiments of the present invention will be described. Compared to the first embodiment and the previously described embodiments, descriptions of the same configurations are omitted and different configurations are described.

4 is a block diagram of a biogas reformer according to a second embodiment of the present invention. Referring to FIG. 4 , the biogas reformer 200 of the second embodiment further includes a plasma reactor 70 provided on the inlet 11 side of the outer housing 10 .

The plasma reactor 70 heats the first amount of feed toward the inner housing 20 . When the feed of the second amount supplied to the plasma burner 40 fluctuates or the amount of heat is insufficient, the plasma reactor 70 auxiliary heats the feed of the first amount, enabling smooth reforming in the catalytic reaction unit 30. let it

As examples, the plasma reactor 70 may be formed of one of arc jet plasma, high frequency inductively coupled plasma and microwave plasma. The arc jet plasma may heat the first amount of feed with high-temperature discharge gas through the arc jet.

Meanwhile, temperature sensors (not shown) may be installed at the front and rear ends of the catalytic reaction unit 30 . The detection signal of the temperature sensor makes it possible to determine whether or not the amount of heat necessary for the catalytic reaction of the catalytic reaction unit 30 is insufficient. Depending on this determination, the plasma reactor 70 may be operated or stopped.

The high-frequency inductively coupled plasma may generate the plasma with radio frequency to meet the first amount of feed at the rear end of the high-frequency inductively coupled plasma (ICP) discharge. Thereby, the stability of ICP operation can be ensured. The microwave plasma can generate a plasma in a microwave band to meet the first amount of feed.

5 is a block diagram of a biogas reformer according to a third embodiment of the present invention. Referring to FIG. 5 , in the biogas reformer 300 of the third embodiment, the inner housing 220 includes a through hole 221 through which combustion emissions are directly supplied to the catalytic reaction unit 30 . A plurality of through holes 221 may be provided at the open end side. The through-holes 221 allow high-temperature combustion emissions to be more uniformly supplied to the catalytic reaction unit 30 and mixed in the catalytic reaction unit 30 .

6 is a block diagram of a biogas reformer according to a fourth embodiment of the present invention. Referring to FIG. 6, the biogas reformer 400 of the fourth embodiment is connected to the inner housing 320 and is spaced apart from the outer housing 10 to form a circulation part 16 in which combustion exhaust circulates. (330) is further included.

The catalytic reaction unit 430 is filled and positioned between the inner housing 320 and the intermediate housing 330 . The plasma burner 40 is coupled to the inner housing 320 at the inlet 11 side and ejects the flame F from the inlet 11 side toward the outlet 12 side.

The inner housing 320 is closed on the discharge port 12 side (321) and connected to the intermediate housing 330, and the intermediate housing 330 and the outer housing 10 are closed on the discharge port 12 side (323), The inner housing 320 and the intermediate housing 330 may form a communication structure 324 on the side of the discharge port 12 to circulate combustion emissions to the circulation unit 16 .

The catalytic reaction unit 430 filled between the inner housing 320 and the intermediate housing 330 communicates with the discharge port 12 through the opening 322 . The outer housing 10 forms a guide 17 protruding inward from the inlet 11 side. The catalytic reaction unit 430 is heated in the inner housing 320 and combustion emissions circulating in the circulation unit 16 are guided to the catalytic reaction unit 430 by the guide unit 17 .

The inner housing 320, the middle housing 330, and the outer housing 10 may optimize the temperature of the catalytic reaction unit 430 by surrounding the inside and outside of the catalytic reaction unit 430 with flames and combustion emissions. The guide part 17 guides the combustion exhaust in the circulation part 16 to be directly introduced into the catalytic reaction part 430 without going out through the inlet 11 .

The first amount of feed flowing into the inlet 11 flows into the guide part 17 and is mixed with the combustion exhaust flowing from the circulation part 16 and supplied to the catalytic reaction part 430 . That is, the combustion emission containing the second amount of CO and H ₂ converted is mixed with the first amount of biogas mainly composed of CO ₂ and CH ₄ and supplied to the catalytic reaction unit 430 .

Since combustion emissions are added to the first amount of feed supplied to the catalytic reaction unit 430, The ratio of carbon dioxide (CO ₂ ):methane (CH ₄ ) is adjusted to 1:1 to 2:1. At this time, since the heat dissipation amount of the plasma burner 40 and combustion emissions circulating in the circulation unit 16 heat the inner housing 320 and the catalytic reaction unit 430, CO ₂ and CH ₄ react to obtain CO and H ₂ make it possible

That is, in the combustion exhaust discharged from the plasma burner 40 , the catalyst is located inside the double wall surrounding the inside and outside of the catalytic reaction unit 430 . Accordingly, the circulation unit 16 can prevent heat loss from the catalytic reaction unit 430 to the outside, thereby maintaining a constant temperature of the catalytic reaction unit 430 .

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these, and it is possible to make various modifications and practice within the scope of the claims, the description of the invention and the accompanying drawings, and this is also the present invention. It goes without saying that it falls within the scope of the invention.

10: outer housing 11: inlet
12: discharge port 13: direction changing member
14: support plate 16: circulation unit
17: guide part 20, 220, 320: inner housing
30, 430: catalytic reaction unit 40, 240: plasma burner
41: burner housing 42: electrode
43, 243: feed passage 44: swirler
45: insulation member 51: first pipeline
52: second pipeline 53: control valve
70: plasma reactor 100, 200: biogas reformer
300, 400: biogas reformer 221: through hole
330: intermediate housing 321, 323: closed
322: opening 324: communication structure
421: discharge part 422: pillar part
431, 433: first inner passage 432: second inner passage
F, F2: flame, spread flame G: discharge gap
IZ: ignition zone MZ: mixing zone

Claims (17)

An outer housing that introduces a first amount of the biogas feed containing methane and carbon dioxide as main components through an inlet and discharges a reformed syngas containing carbon monoxide and hydrogen through the discharge port;
an inner housing disposed inside the outer housing and having one end opened inside the outer housing;
a catalytic reaction unit provided between the inner housing and the outer housing and communicating with the discharge port; and
It is provided in the inner housing to form a flame by plasma discharge by the second amount of the oxidizing agent and the feed remaining except for the first amount to heat the inner housing, and in the second amount, methane is reduced and carbon dioxide is increased. Combustion emissions Plasma burner supplied to the inlet side
Including,
the inner housing
A reformer of biogas forming an open end inside the inlet side of the outer housing. According to claim 1,
A first conduit for supplying the first amount to the inlet side of the outer housing, and
A second conduit connected to the branch point of the first conduit through a control valve to supply the second amount to the plasma burner.
A reformer of biogas further comprising a. According to claim 1,
The catalytic reaction unit
A reformer of biogas positioned between the outer surface of the inner housing and the inner surface of the outer housing. delete According to claim 1,
the outer housing
A direction changing member provided in front of the open end of the inner housing at the inside of the inlet side to change the direction of combustion emissions
A reformer of biogas further comprising a. According to claim 5,
The first amount of feed flowing into the inlet side is
A reformer of biogas that is supplied to the catalytic reaction unit while being mixed with the direction-converted combustion exhaust as it flows into the outside of the direction-changing member. According to claim 6,
The feed supplied to the catalytic reaction unit is
Since combustion emissions are added to the first amount, the ratio of carbon dioxide (CO ₂ ): methane (CH ₄ ) is adjusted to 1: 1 to 2: 1. According to claim 2,
The plasma burner,
A burner housing coupled to the inner housing at the outlet side and electrically grounded, and
An electrode built into the burner housing to which a high voltage is applied, forming a discharge gap, and forming a feed passage connected to the second conduit.
A reformer of biogas comprising a. An outer housing that introduces a first amount of the biogas feed containing methane and carbon dioxide as main components through an inlet and discharges a reformed syngas containing carbon monoxide and hydrogen through the discharge port;
an inner housing disposed inside the outer housing and having one end opened inside the outer housing;
a catalytic reaction unit provided between the inner housing and the outer housing and communicating with the discharge port; and
It is provided in the inner housing to form a flame by plasma discharge by the second amount of the oxidizing agent and the feed, excluding the first amount, to heat the inner housing, and in the second amount, methane is reduced and carbon dioxide is increased. Combustion emissions supplied to the inlet side,
A first conduit for supplying the first amount to the inlet side of the outer housing, and
A second conduit connected to the branch point of the first conduit through a control valve to supply the second amount to the plasma burner.
Including more,
The plasma burner,
A burner housing coupled to the inner housing at the outlet side and electrically grounded, and
An electrode built into the burner housing to which a high voltage is applied, forming a discharge gap, and forming a feed passage connected to the second conduit.
including,
the electrode
A convex-shaped discharge part forming the discharge gap and a pillar part formed with a smaller diameter than the discharge part and connected to the discharge part,
The feed passage is
A first inner passage connected to the second conduit and formed in the pillar part, and
A second inner passage connected to the first inner passage and formed in the discharge unit toward the burner housing
A reformer of biogas comprising a. According to claim 9,
The first inner passage
A reformer of biogas extending to the end of the discharge unit through the second inner passage and ejecting combustion emissions toward the inlet. According to claim 9,
The plasma burner,
A swirler provided between the pillar portion and the burner housing at the rear of the discharge unit to generate a swirl in the oxidant supplied to the discharge gap.
A reformer of biogas further comprising a. According to claim 2,
A plasma reactor provided at the inlet side of the outer housing to heat a first amount of feed toward the inner housing
A reformer of biogas further comprising a. According to claim 12,
The plasma reactor
A reformer of biogas formed by one of arc jet plasma, high frequency inductively coupled plasma and microwave plasma reactor. According to claim 1,
the inner housing
A reformer of biogas having a through hole for supplying combustion emissions to the catalytic reaction unit. According to claim 14,
The through hole is
A reformer of biogas provided in plurality on the open end side. An outer housing that introduces a first amount of the biogas feed containing methane and carbon dioxide as main components through an inlet and discharges a reformed syngas containing carbon monoxide and hydrogen through the discharge port;
an inner housing disposed inside the outer housing and having one end opened inside the outer housing;
a catalytic reaction unit provided between the inner housing and the outer housing and communicating with the discharge port; and
It is provided in the inner housing to form a flame by plasma discharge by the second amount of the oxidizing agent and the feed remaining except for the first amount to heat the inner housing, and in the second amount, methane is reduced and carbon dioxide is increased. Combustion emissions Plasma burner supplied to the inlet side
Including,
Further comprising an intermediate housing connected to the inner housing and spaced apart from the outer housing to form a circulation portion in which combustion exhaust circulates,
The catalytic reaction unit
A reformer for biogas filled between the inner housing and the intermediate housing. According to claim 16,
The plasma burner,
coupled to the inner housing at the inlet side;
the inner housing
Closed at the outlet side and connected to the intermediate housing,
the outer housing
A reformer of biogas that forms a guide at the inlet side to guide combustion emissions circulating in the circulation unit to the catalytic reaction unit.

Images