KR20140038260A

KR20140038260A - Gasifier

Info

Publication number: KR20140038260A
Application number: KR1020120104781A
Authority: KR
Inventors: 주지선
Original assignee: 한국전력공사
Priority date: 2012-09-20
Filing date: 2012-09-20
Publication date: 2014-03-28

Abstract

Disclosed is a gasifier in which the combustion gas generated in the combustion section is introduced into the gasification section to gasify the gasified fuel and generate the synthesis gas, thereby reducing the need for cooling the synthesis gas.
Gasizer according to an embodiment of the present invention is a combustion unit 200 is configured to produce a combustion gas at a temperature at which fuel and oxygen is supplied and the combustion is made to melt the non-combustible components such as ash; And a synthesis gas having a predetermined temperature connected to the combustion unit 200 to supply a combustion gas generated in the combustion unit 200, supply a gasification fuel, and gasify the gasification fuel by the combustion gas to reduce the need for cooling. A gasification unit 300 configured to be; As shown in FIG.
By the above configuration, the present invention can lower the temperature of the synthesis gas generated in the gasifier, reduce the amount of oxygen required for the production of the synthesis gas, and reduce the need for cooling of the synthesis gas is used as a coolant The amount of syngas can be reduced, and most of the non-combustible components, such as ash, can be slag and discharged to the bottom of the gasifier.

Description

Gasifier {GASIFIER}

The present invention relates to a gasifier for gasifying a gasification fuel that is a carbon-containing material such as coal to produce a synthesis gas containing carbon monoxide and hydrogen as a main component, and more particularly, the combustion gas generated in the combustion unit is introduced into the gasification unit. Thereby gasifying the gasifier fuel and producing syngas, thereby reducing the need for cooling the syngas.

A gasifier is a device which produces | generates the synthesis gas which has carbon monoxide and hydrogen as a main component by gasifying the gasification fuel which is carbon-containing substances, such as coal.

As such, the syngas produced in the gasifier is used, for example, to drive a gas turbine. It is also used as a raw material for chemical products such as methanol, and also used as a hydrogen supply source for high efficiency power generation in connection with fuel cells. In addition, incombustible components such as ash, which are not gasified during gasification, become slag in the gasifier, which is used as aggregate.

7 is a view showing a conventional gasifier 10, as shown in the gasifier 10 is provided with a gasification burner (B). The gasification burner B supplies gasification fuel, oxygen and water vapor, which are carbon-containing materials such as coal, to the gasifier 10, and gasification of the gasification fuel generates gaseous synthesis gas.

As shown in FIG. 7, the syngas generated in the gasifier 10 is discharged from the outlet above the gasifier 10, flows into the heat exchanger HE, and flows into the heat exchanger HE while flowing. Heat exchange with). Then, the syngas heat-exchanged with the steam (V) is processed and supplied to the user through the dust collector (D), scrubber (W) and desulfurizer (DS) as shown in FIG.

In addition, as shown in FIG. 7, the non-combustible component such as ash is to be slag (S). To this end, in the conventional gasifier 10, the temperature of the generated synthesis gas is 1500 ° C to 1600 ° C or more, which is a temperature at which a nonflammable component such as ash is melted. Therefore, in the conventional gasifier 10, a relatively large amount of oxygen has a problem for maintaining the temperature of the synthesis gas for the non-flammable component oil such as ash.

And since the temperature of the syngas produced by the gasifier 10 is 1500 degreeC-1600 degreeC or more, the temperature of the syngas discharged | emitted from the outlet of the upper part of the gasifier 10 also becomes a high temperature of about 1400 degreeC-1500 degreeC. . Accordingly, the syngas discharged from the outlet of the upper part of the gasifier 10 should be cooled to flow into the heat exchanger HE. To this end, conventionally, as shown in FIG. 7, the synthesis gas having the temperature of the rear end of the dust collector D is 200 ° C. to 250 ° C. is supplied to the cooling nozzle N provided at the outlet of the gasifier 10, and the cooling nozzle ( By injection into the outlet above the gasifier 10 through N), the syngas at the outlet of the gasifier 10 was cooled.

In the case of the conventional gasifier 10, since about 50% of the synthesis gas passing through the dust collector D is used for cooling the synthesis gas at the outlet of the gasifier 10, a relatively large amount of syngas is a coolant. In addition, there is a problem that a relatively large amount of energy is required to supply it to the gasifier 10 outlet. In addition, the capacity of the heat exchanger (HE) and the dust collector (D) increases, there is also a problem that the initial investment costs increase.

In addition, the non-combustible components such as ash must be melted by the high temperature synthesis gas into slag (S) and discharged under the gasifier 10, but a relatively large amount (about 15% to 20% of the non-combustible components) is synthesized. There is a problem that the gas is discharged to the outlet of the upper gasifier 10 is discharged. As described above, the non-combustible component discharged to the outlet of the upper part of the gasifier 10 may cause problems such as howling in the pipe or may be attached to the heat exchanger HE to reduce the performance of the heat exchanger HE.

The present invention is made by recognizing at least one of the needs or problems occurring in the conventional gasifier as described above.

One aspect of the present invention is to lower the temperature of the synthesis gas produced in the gasifier.

Another aspect of the object of the present invention is to reduce the amount of oxygen required for the production of syngas.

Another aspect of the object of the present invention is to reduce the amount of syngas used as the coolant by reducing the need for cooling the syngas.

Another aspect of the object of the present invention is that most of the non-combustible components such as ash are slag to be discharged to the bottom of the gasifier.

A gasifier according to an embodiment for realizing at least one of the above problems may include the following features.

The present invention is basically based on gasification of gasified fuel and generation of syngas by allowing the combustion gas generated in the combustion section to flow into the gasification section.

According to one embodiment of the present invention, a gasifier includes a combustion unit configured to generate a combustion gas at a temperature at which fuel and oxygen are supplied and combustion is performed to melt a non-combustible component such as ash; And a gasifier configured to be connected to the combustion unit so that the combustion gas generated in the combustion unit flows in, the gasification fuel is supplied, and the gasification fuel is gasified by the combustion gas to generate a synthesis gas having a predetermined temperature at which cooling needs are reduced. As shown in FIG.

In this case, the gasification unit is connected to the upper portion of the combustion unit so as to be positioned above the combustion unit, and the combustion gas generated in the combustion unit may rise and flow into the gasification unit.

In addition, the combustion unit is provided with one or more burners for supplying fuel and oxygen is combusted combustion zone is generated combustion gas; And a slag region which is connected to the lower portion of the combustion region and is included in the fuel and in which the non-combustible components melted by the combustion gas are collected into slag. . &Lt; / RTI >

In addition, at least two burners are provided in the combustion zone, and the burner is provided at a location of the combustion zone to allow combustion gas to swing, and the gasifier descends to the center of the gasification section and flows upward while turning along the inner wall of the gasification section. Flow can be achieved.

In addition, the slag area may have a smaller cross-sectional area toward the bottom.

In addition, the gasification unit is connected to the combustion unit rising region through which the combustion gas generated in the combustion unit flows; And at least one supply nozzle connected to the rising area to supply the combustion gas and supply the gasification fuel to gasify and generate a synthesis gas; . &Lt; / RTI >

In addition, the gasification zone is provided with two or more supply nozzles, the supply nozzles are provided at the position of the gasification zone to allow the syngas to turn, and the flow and gasification zone rising while turning along the inner wall of the gasification zone to the gasification zone It can be made to flow down to the center.

In addition, the cross-sectional area of the raised area may increase toward the top.

In addition, the combustion unit may be completely burned to produce a combustion gas mainly containing carbon dioxide and water vapor.

As described above, according to the exemplary embodiment of the present invention, the combustion gas generated in the combustion unit is introduced into the gasification unit to gasify the gasification fuel and generate the synthesis gas, thereby lowering the temperature of the synthesis gas generated in the gasifier.

In addition, according to the embodiment of the present invention, it is possible to reduce the amount of oxygen required for the production of syngas.

In addition, according to the embodiment of the present invention, it is possible to reduce the amount of syngas used as the coolant by reducing the need for cooling the syngas.

In addition, according to the embodiment of the present invention, most of the non-combustible components such as ash may be slag to be discharged to the lower part of the gasifier.

1 is a cross-sectional view showing an embodiment of a gasifier according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1 and shows embodiments of the combustion region of the combustion section of the gasifier according to the present invention.
FIG. 3 is a cross-sectional view taken along line BB ′ of FIG. 1, showing embodiments of a gasification region of a gasifier of a gasifier according to the present invention.
Figure 4 is a view showing the results of numerical analysis of the flow in the rising region of the gasifier of one embodiment of the gasifier according to the present invention.
5 is a view showing the results of numerical analysis of the flow in the gasification region of the gasifier of one embodiment of a gasifier according to the present invention.
6 is a view showing the results of numerical analysis of the flow of non-combustible components such as ash in one embodiment of the gasifier according to the present invention.
7 is a view showing a conventional gasifier.

In order to help the understanding of the features of the present invention as described above, it will be described in more detail with respect to the gasifier associated with the embodiment of the present invention.

Hereinafter, exemplary embodiments will be described based on embodiments best suited for understanding the technical characteristics of the present invention, and the technical features of the present invention are not limited by the illustrated embodiments, It is to be understood that the present invention may be implemented as illustrated embodiments. Therefore, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. In order to facilitate understanding of the embodiments to be described below, in the reference numerals shown in the accompanying drawings, among the constituent elements which perform the same function in each embodiment, the related constituent elements are indicated by the same or an extension line number.

Embodiments related to the present invention are basically based on gasification of the gasified fuel and generation of syngas by allowing the combustion gas generated in the combustion unit to flow into the gasification unit.

As shown in FIG. 1, the gasifier 100 according to the present invention may include a combustion unit 200 and a gasifier 300.

The combustion unit 200 may be configured to supply fuel and oxygen, which is a carbon-containing material such as coal, and to generate combustion gas by combustion. In this case, the main combustion equation is:

C + O ₂ → CO ₂ -283 MJ / kmol (Exothermic)

In addition, the combustion unit 200 may be configured to generate a combustion gas of a temperature at which the non-combustible components such as ash can be melted. Since non-combustible components such as ash are melted at 1500 ° C. to 1600 ° C., the temperature of the combustion gas generated in the combustion unit 200 should be higher than 1500 ° C. to 1600 ° C. To this end, the combustion unit 200 may be completely burned to generate a combustion gas mainly containing carbon dioxide and water vapor. Since the temperature of the combustion gas is 2000 ℃ to 2500 ℃ it has a temperature sufficient to melt the non-combustible components such as ash.

The combustion unit 200 may include a combustion region 210 and a slag region 220 as shown in the embodiment shown in FIG. 1.

As shown in FIG. 1, the combustion zone 210 may include one or more burners 211 supplied with fuel and oxygen, which are carbon-containing materials such as coal. By the burner 211, combustion may be generated as shown in FIG. 1 to generate combustion gas. The configuration of the burner 211 is not particularly limited, and any configuration known in the art can be used as long as the fuel and oxygen are supplied and the combustion is performed to generate the combustion gas.

In the combustion region 210, two or more burners 211 may be provided as shown in FIG. 2. As illustrated in FIG. 2A, two burners 211 may be provided in the combustion region 210, or four burners 2 may be provided as in the embodiment illustrated in FIG. 2B. . However, three burners 211 or five burners 211 may be provided in the combustion region 210.

In addition, as illustrated in FIG. 2, the burner 211 may be provided at a location of the combustion region 210 to allow the combustion gas to swing. That is, as shown in the illustrated embodiment, the burner 211 may be provided in the combustion region 210 to coincide with the tangent of the cross section of the combustion region 210.

Accordingly, the combustion gas generated in the combustion zone 210 and introduced into the gasification unit 300 may rise while turning along the inner wall of the gasification unit 300 as shown in FIGS. 1 and 4. As a result, the ascending flow may be made while turning along the inner wall of the gasification unit 300 to the gasification unit 300.

In addition, the center portion of the gasifier 300 is emptied by the rising flow while turning along the inner wall of the gasifier 300, so as to descend to the center of the gasifier 300 as shown in FIGS. 1 and 4. Flow can be made. That is, as shown and will be described later, non-combustible components such as ash may fall to the central portion of the gasification unit 300. As described above, the non-combustible component such as ash lowered to the center portion of the gasification unit 300 is melted by the combustion gas in the combustion region 210 as shown in FIG. 1, and thus, the slag region 220 of the combustion unit 200 to be described later. Can flow.

As shown in FIG. 1, the slag region 220 may be connected to the lower portion of the combustion region 210. Then, as shown, the non-combustible components melted by the combustion gas and melted by the combustion gas may be collected into slag (S). The slag region 220 may have a smaller cross-sectional area toward the bottom as shown in the illustrated embodiment. As a result, non-combustible components such as ash, which flows into the combustion region 210 and is melted by the combustion gas, may be lowered while turning along the inner wall of the slag region 220 as shown. Then, the slag may be solidified on the inner wall of the slag region 220 to become slag S.

The gasifier 300 may be connected to the combustion unit 200. Accordingly, as shown in FIG. 1, the combustion gas generated in the combustion unit 200 may be introduced. In addition, a gasification fuel that is a carbon-containing material such as coal can be supplied. The gasification fuel may be gasified by the combustion gas to generate a synthesis gas having a predetermined temperature. That is, the gasification fuel is gasified by the heat of the combustion gas and carbon dioxide and water vapor included in the combustion gas, thereby producing a synthesis gas mainly composed of carbon monoxide and hydrogen.

In this case, the main gasification reaction is as follows.

C + H ₂ O ↔ CO + H ₂ +131 MJ / kmol (endothermic reaction)

C + CO ₂ ↔ 2CO +172 MJ / kmol (Exothermic)

CO + H ₂ O ↔ CO ₂ + H ₂ -41 MJ / kmol (Exothermic)

On the other hand, as described above, since the melting of the non-combustible component such as ash is made in the combustion region 210 of the combustion unit 200, the temperature of the synthesis gas as in the prior art, that is, the temperature at which the non-combustible component such as ash can be melted, It is not necessary to raise it to 1500 degreeC-1600 degreeC or more. Therefore, the amount of oxygen required in the gasifier 100 can be reduced.

In addition, since the gasification reaction is performed at a temperature of 1100 ° C. to 1200 ° C., the gasification of the gasification fuel is sufficiently performed by the combustion gas, and the temperature of the generated synthesis gas may be 1100 ° C. or less. Therefore, the need for cooling the syngas to pass through a heat exchanger or the like installed at the rear end of the gasifier 100 can be reduced.

That is, for cooling the syngas at the outlet of the gasifier 100, for example, the amount of the syngas at 200 ° C to 250 ° C after the dust collector D supplied to the outlet of the gasifier 100 as shown in FIG. This may be reduced or it may not be necessary to cool the syngas at the outlet of the gasifier 100.

As shown in FIG. 1, the gasification unit 300 may be connected to an upper portion of the combustion unit 200 to be positioned above the combustion unit 200. Accordingly, as illustrated in FIGS. 1 and 4, the combustion gas generated by the combustion unit 200 may rise and flow into the gasification unit 300.

The gasifier 300 may include a rising region 310 and a gasification region 320 as shown in FIG. 1.

As shown in FIG. 1, the rising area 310 may be connected to the combustion unit 200. That is, as shown in the illustrated embodiment, the elevated region 310 may be connected to the combustion region 210 of the combustion unit 200. Accordingly, as shown in FIG. 1 and FIG. 4, the combustion unit 200, that is, the combustion gas generated in the combustion region 210 of the combustion unit 200 in the embodiment shown in FIG. It can flow.

As shown in the embodiment shown in FIG. 1, the raised area 310 may increase in cross-sectional area. The combustion gas rises while turning along the inner wall of the gasification unit 300 as described above and shown in FIG. Therefore, as shown in FIGS. 1 and 4, when the combustion gas rises while turning along the inner wall of the rising area 310 of the gasification part 300, the cross-sectional area of the gasification part 300 increases. 310 and the central portion of the gasification region 320 of the gasification unit 300 is empty. As a result, as illustrated in FIGS. 1, 4, and 5, non-combustible components such as ash may descend from the rising region 310 of the gasifier 300 and the central portion of the gasification region 320 of the gasifier 300. Will be. That is, the flow descending to the center portion of the gasifier 300 may be made.

As shown in FIG. 1, the gasification region 320 may be connected to the rising region 310. As a result, the combustion gas may be introduced as shown in FIGS. 1, 4, and 5. In addition, one or more supply nozzles 321 may be provided in the gasification region 320 as shown in FIG. 1. The gasification fuel, which is a carbon-containing material such as coal, may be supplied to the gasification region 320 through the supply nozzle 321. In addition, synthesis gas may be generated by gasifying the gasified fuel supplied to the gasification region 320 through the supply nozzle 321 by the combustion gas introduced into the gasification region 320.

On the other hand, not only gasification fuel but also some oxygen may be supplied through the supply nozzle 321.

In the gasification region 320, two or more supply nozzles 321 may be provided as shown in FIG. 3. As shown in FIG. 3A, two supply nozzles 321 may be provided in the gasification region 320, and four may be provided as in the embodiment illustrated in FIG. 3B. have. However, three supply nozzles 321 or five supply nozzles 321 may be provided in the gasification region 320.

And, as shown in the embodiment shown in Figure 3, the supply nozzle 321 may be provided at the position of the gasification region 210 to allow the syngas to swing. That is, as shown in the illustrated embodiment, the supply nozzle 321 may be provided in the gasification region 320 to coincide with the tangent of the cross section of the gasification region 320.

Accordingly, the syngas generated in the gasification region 320 may rise while turning along the inner wall of the gasification region 320 as shown in FIGS. 1 and 5. As a result, ascending flow may be performed while turning along the inner wall of the gasification region 320 in the gasification region 320.

In addition, since the center of the gasification region 320 is emptied by this, a flow descending to the center of the gasification region 320 may be performed as shown in FIGS. 1 and 5. That is, as shown, non-combustible components, such as ash, may fall to the central portion of the gasification region 320. As described above, the non-combustible component such as ash lowered to the center of the gasification area 320 is lowered to the center of the rising area 310 of the gasification part 300 as described above and illustrated in FIG. ) May be introduced into the combustion zone 210. In addition, the non-combustible component such as ash is melted as described above by the combustion gas in the combustion region 210 and flows to the slag region 220 of the combustion unit 200.

Table 2 below shows the results of computer simulation of the characteristics of the conventional gasifier 10 and the gasifier 100 according to the present invention using a fuel having the properties as shown in Table 1 below.

Kinds Bituminous coal Elemental analysis
(dry basis)
Wt% C 71.72 Industrial analysis
(dry basis)
Wt% moisture 0.0 H 5.06 Ash 10.91 N 1.41 Volatility 39.37 S 2.82 Fixed carbon 49.72 O 7.75 Sum 100 Cl 0.33 Calorific value 30,506 (HHV, kJ / kg) Ash 10.91 Sum 100

In addition, the gasifier 100 according to the present invention was simulated for Case 1 and Case 2 by varying the oxygen supply as shown in Table 2 below.

In the case of the conventional gasifier 10, as shown in Table 2, the amount of oxygen required to maintain the syngas temperature at the outlet of the gasifier 10 at 1500 ° C is 0.79 kg per kg of fuel. In addition, the amount of recycled syngas required to cool the syngas at 1500 ° C discharged from the gasifier 10 outlet to 900 ° C or less is 51% based on the recycled syngas temperature of 250 ° C.

division Conventional Gasifier Gasifier according to the present invention Case 1 Case 2 Fuel supply
(kg coal / kg coal) 1.0 1.0 1.0 Oxygen supply
(kg O ₂ / kg coal) 0.79 0.62 0.39 Water vapor supply
(kg H ₂ O / kg coal) 0.15 0.15 0.15 CO ₂ supply
(kg CO ₂ / kg coal) 0.19 0.19 0.19 Syngas temperature at the gasifier outlet (℃) 1500 1104 900 Syngas composition at the gasifier outlet (vol%) CO 62.57 65.77 71.1 H ₂ 28.78 23.91 0 CO ₂ 2.56 1.27 0 H ₂ O 4.39 0.98 0 CH ₄ 0.02 6.23 26.5 H2S 0.09 0.1 0 COS 0.004 0.01 1.39 Etc 1.59 1.73 1.01 Sum 100 100 100 Syngas recycle rate (%) to cool syngas below 900 ℃
(Based on recycle syngas temperature 250 ℃) 51 25 0

However, in the case of the Case1 a gasifier 100 of the present invention, that relatively oxygen as in the case of fuel supplied per 0.62kg 1kg, 6.23% The composition of the synthesis gas is CH ₄ than the conventional gasifier 10 In addition to appearing high, the composition of CO and H ₂ can be seen to be similar.

In addition, the synthesis gas outlet temperature of Case1 of the gasifier 100 according to the present invention was 1104 ° C., which was lower than the synthesis gas outlet temperature of the conventional gasifier 10. The required syngas recycle was 25%. Therefore, in case 1 of the gasifier 100 according to the present invention, although the oxygen consumption is reduced by 21% and the amount of coolant used is reduced by 51%, a synthesis gas having a composition similar to that of the conventional gasifier 10 can be obtained.

In addition, in case 2 of the gasifier 100 according to the present invention, that is, in the case of supplying 0.39 kg of oxygen per 1 kg of fuel, the composition of the synthesis gas was found to be CO 71.1%, CH ₄ 26.5%, and this condition It is judged that it can be optimally applied to the operation of the gasifier 100 for the production of natural syngas, and because the synthesis gas outlet temperature is 900 ℃ it was found that cooling is not necessary.

Therefore, in case 2 of the gasifier 100 according to the present invention, although the oxygen consumption is reduced by 49% and cooling is not required, it can be seen that a synthetic gas having an optimal composition for gasifier operation can be obtained.

In addition, as shown in FIG. 4 and FIG. 5, it can be seen that in the rising area 310 and the gasification area 320 of the gasification part 300, a flow that rises while descending along the inner wall and a flow that descends the center part are made. . As shown in FIG. 6, the non-combustible components such as ash in the gasifier 100 according to the present invention lower the central portions of the gasification area 320 and the rising area 310 of the gasification part 300 to burn the combustion part ( It is melted by the combustion gas in the combustion region 210 of the 200, and descends while turning along the inner wall of the slag region 220 in the slag region 220 to solidify on the inner wall of the slag region 220 to the slag (S). It can be seen that.

Accordingly, it can be seen that non-combustible components such as ash are mostly collected in the slag region 220 of the combustion unit 220 without exiting to the outlet of the gasifier 100 according to the present invention.

By using the gasifier according to the present invention as described above, it is possible to lower the temperature of the synthesis gas generated in the gasifier, to reduce the amount of oxygen required for the production of the synthesis gas, to reduce the need for cooling the synthesis gas The amount of syngas used as the coolant can be reduced, and most of the nonflammable components such as ash can be slag and discharged to the bottom of the gasifier.

The gasifier described above may not be limitedly applied to the configuration of the above-described embodiment, but the embodiments may be configured by selectively combining all or some of the embodiments so that various modifications can be made.

10, 100: gasifier 200: combustion unit
210: combustion zone 211, B: burner
220: slag area 300: gasification unit
310: rising zone 320: gasification zone
321: supply nozzle S: molten slag
N: Cooling nozzle HE: Heat exchanger
D: Dust Collector W: Washing Machine
DS: Desulfurizer

Claims

A combustion unit 200 configured to generate a combustion gas at a temperature at which fuel and oxygen are supplied and combustion is performed to melt non-combustible components such as ash; And
The combustion gas generated by the combustion unit 200 is connected to the combustion unit 200 to supply the gasification fuel, and the gasification fuel is gasified by the combustion gas to generate a synthesis gas having a predetermined temperature at which cooling needs are reduced. Gasification unit 300 is configured;
Gasifier configured including.

According to claim 1, wherein the gasifier 300 is connected to the upper portion of the combustion unit 200 to be positioned above the combustion unit 200 and the combustion gas generated in the combustion unit 200 is raised to the gasification unit Gasifier, characterized in that flowing into the 300.

According to claim 2, wherein the combustion unit 200 is provided with one or more burners (211) for supplying fuel and oxygen combustion is made and the combustion region 210 is generated combustion gas; And
A slag region 220 connected to a lower portion of the combustion region 210 and included in a fuel and in which a non-combustible component melted by combustion gas is collected into slag S;
&Lt; / RTI >

According to claim 3, wherein the combustion zone 210 is provided with two or more burners 211, the burner 211 is provided at the position of the combustion zone 210 to allow the combustion gas to rotate, A gasifier comprising a flow that rises while turning along the inner wall of the gasifier (300) to the gasifier (300) and a flow that descends to the center of the gasifier (300).

The gasifier of claim 3, wherein the slag region (220) has a smaller cross-sectional area as it goes downward.

According to claim 2, wherein the gasifier 300
A rising region 310 connected to the combustion unit 200 and into which the combustion gas generated in the combustion unit 200 flows in; And
A gasification region 320 connected to the rising region 310 and provided with at least one supply nozzle 321 for supplying gasification fuel to gaseous gas and generating synthesis gas;
&Lt; / RTI >

According to claim 6, wherein the gasification region 320 is provided with two or more supply nozzles 321, the supply nozzle 321 is provided at the position of the gasification region 320 to allow the synthesis gas to turn. And a gas rising to rotate along the inner wall of the gasification area (320) to the gasification area (320) and a flow descending to a central portion of the gasification area (320).

The gasifier of claim 6, wherein the raised area (310) increases in cross-sectional area.

The gasifier of claim 1, wherein the combustion unit (200) is completely burned to produce a combustion gas mainly containing carbon dioxide and water vapor.