WO2001045824A1

WO2001045824A1 - Methods of cooling producer gas from high-temperature swirl furnace and of arresting entrained slag mist

Info

Publication number: WO2001045824A1
Application number: PCT/JP1999/007226
Authority: WO
Inventors: Makoto Terauchi; Toshiaki Nakamura
Original assignee: Ube Industries, Ltd.
Priority date: 1998-06-24
Filing date: 1999-12-22
Publication date: 2001-06-28
Also published as: JP3777801B2; JP2000005542A

Abstract

Gas produced in the reaction chamber (1) of a high-temperature swirl furnace is blown through a downcomer (4) into a quenching chamber (2) having a quenching bath, whereby the producer gas is cooled and slag mist entrained in this gas is arrested. Cooling water from a cooling water pouring part at the top of the downcomer is allowed to flow circumferentially of the downcomer along the inner wall surface to form a swirling water membrane. The pouring of the cooling water is effected tangentially as seen in the horizontal section of the downcomer so that the swirling water membrane may be in a direction that is the same as or opposite to that of the swirling flow of the producer gas in the downcomer. The cooling water pouring part can employ an overflow weir system from a trough formed in the outer periphery of the downcomer or a guide plate system having an annular flow channel formed in the inner periphery of the downcomer for direct downflowing.

Description

Description Method of cooling high-temperature swirl furnace generated gas and collecting entrained slag mist Technical field

The present invention relates to a method for cooling gas generated from a high-temperature swirl furnace used for gasification or combustion of organic raw materials or wastes, and for collecting slag mist accompanying the gas. Background art

Conventionally, much of municipal solid waste, industrial waste and sewage sludge are sent to incineration facilities, and human waste and highly concentrated waste liquid are sent to water treatment facilities for treatment. However, much of the waste is still being dumped untreated, leading to environmental pollution and tight landfills. For this reason, there is a strong demand for the practical use of a gasification and melting system in which waste is gasified at a low temperature and then burned at a high temperature to convert ash into molten slag and completely decompose dioxins. I have.

Although various configurations and treatment methods for the high-temperature combustion furnace or high-temperature gasifier as the core above have been proposed, it can be said that the method of cooling the gas generated in such a high-temperature gasifier also determines the success or failure of the above system. Is more important.

An example of the configuration of a conventional device for cooling the high-temperature syngas obtained by coal gasification is shown in the schematic sectional view of FIG. This equipment supplies coal slurry through a parner attached to a parner mounting nozzle 28, and converts it into gas at high temperature and pressure to generate a generated gas, and a generated gas in the reaction chamber 21. Quenching chamber 2 2 Is communicated through the slot section 23 with. The quenching chamber 22 is provided with a downcomer 24 connected to the throat section 23, and the lower end of the downcomer 24 has a quench bath 25 in the quench chamber 22. It is immersed inside and divides the upper space of the quenching chamber 24 inside and outside. Therefore, the gas from the throat section 23 is introduced into the cooling area inside the downcomer 24 and then blown into the quench bath 25, and blows up into the upper space of the quench chamber 22 outside the downcomer 24. .

A gas exhaust pipe 27 is provided to communicate with the chamber space on the outer peripheral side of the downcomer pipe 24, and a quenching ring 29 is provided at the boundary between the reaction chamber 21 and the quenching chamber 22. The lower surface of 29 is in contact with the upper end of the downcomer 24. The quench ring 29 is divided into an upper spray chamber 30 and a lower film chamber 31. The cooling water discharged from the film chamber 31 travels substantially parallel to the axis of the downcomer 24 and falls along the inner surface of the downcomer 24 to form a thin falling film of the cooling water. Further, the cooling water discharged from the spray chamber 30 travels from around the quenching ring 29 in the direction of the main axis of the downcomer 24. 26 is the line that discharges slag, d is generated gas, and e is cooling water.

The synthesis gas descending by a combination of turbulence and film evaporation cooling and spray cooling in the cooling zone is cooled from an initial temperature of, for example, 130 ° C. to an outlet temperature of the downcomer 24, for example, about 500 ° C. Can be cooled <In addition, the synthesis gas exiting from the lower part of the cooling zone passes through the quench bath 25 and most of the 95% of the ash and carbide particles separate from the gas at the lower end of the cooling zone Is done. The gas passing through the quench bath 25 rises together with the evaporated cooling water while cooling the outer region of the downcomer 24 and is discharged from the gas discharge tube 27 at a temperature of, for example, 23 ° C.

In addition, the invention disclosed in International Publication No. WO988Z102 And a gasification method for waste using a swirling melting furnace, '' in a swirling melting furnace consisting of a reaction chamber and a slag separation chamber, the slag flowing down the wall of the reaction chamber becomes slag droplets and enters the slag separation chamber. After falling down, the gas sprayed slag is spray-cooled at the same time as cooling the inner wall of the downcomer pipe by an auxiliary spray arranged in the circumferential direction of the junction with the downcomer pipe in the separation chamber, and then the water in the quench bath at the bottom of the slag separation chamber And quenched. Gas rising outside the downcomer is discharged from the gas outlet provided in the slag separation chamber, and slag deposited in the quench bath is discharged from the slag outlet.

However, in the method of cooling generated gas and collecting slag mist accompanying the generated gas in the high-temperature synthesis gas cooling device or the swirling melting furnace, a certain cooling efficiency ゃ a collection efficiency of slag mist is achieved in each process. However, there is a need for more effective cooling and collection methods. In particular, improvements and developments that are desired in methods related to high-temperature swirl furnaces are listed below as issues.

(a) Involvement of a method for cooling the gas generated from the high-temperature swirling furnace inside the downcomer pipe by conventional techniques, for example, cooling the inner wall of the pipe by an auxiliary spray provided at the junction of the downcomer pipe and cooling gas more effectively than gas cooling.

(b) Improvement of the cooling water supply method so that slag mist accompanying the generated gas can be collected by the flow of the cold water on the inner surface of the downcomer pipe and the water droplets generated inside the downcomer pipe.

(c) A method of generating countless water droplets throughout the downcomer to improve the gas cooling effect.

(d) Cooling to ensure that the thickness of the wetting wall of the swirling flow of cooling water inside the downcomer pipe is always uniform in order to reliably collect slag mist accompanying the generated gas that is blown while swirling. Improvement of water supply method.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-temperature swirling furnace, in which An object of the present invention is to provide a more effective cooling method for generated gas, including collecting slag mist by water flow generated in a circulating flow and the entire inside of a downcomer pipe. Disclosure of the invention

The present inventors have conducted intensive studies to achieve the above object, and as a result, assuming that the direction of the swirling flow of the cooling water on the inner surface of the downcomer is the same as the direction of the swirling flow of the generated gas in the downcomer, the generated gas The slag mist that accompanies can be collected reliably.On the other hand, if the direction of the swirling flow of the cooling water is opposite to that of the generated gas, water droplets can be generated in the entire interior of the downcomer. And arrived at the present invention.

That is, the present invention cools the generated gas by blowing the gas generated in the reaction chamber of the high-temperature swirling furnace into a quenching chamber having a quenching bath through a downcomer pipe, and reduces slag mist accompanying the gas. When collecting, the cooling water film formed by supplying the cooling water to the inner wall surface of the downcomer is formed as a swirling water film flowing in the circumferential direction of the downcomer. The swirling water film supplies cooling water from the cooling water injection part provided at the top of the downcomer pipe that introduces the generated gas into the gas quenching chamber.In this supply, the cooling water wets the inner surface of the downcomer pipe This can be realized by injecting the wall flow from the tangential direction in the horizontal cross section of the downcomer so that the swirl flows in the same or opposite direction to the swirl flow of the generated gas in the downcomer. The generated gas is cooled by evaporating a part of the cooling water by bringing the hot generated gas into direct contact with the swirling flow of the cooling water formed on the inner surface of the downcomer pipe.

If the flow direction of the swirling water film is the same as the swirling flow direction of the generated gas, the swirling flow of the generated gas is reliably maintained and promoted, and the slag mist accompanying the generated gas wets the cooling water inside the downcomer pipe. It is possible to reliably capture the flow in the wall swirling flow. In addition, the swirling flow of the generated gas lowers the swirling flow of the cooling water. The wet wall thickness can be made uniform by pressing in the circumferential direction of the inner surface of the pipe.

On the other hand, if the flow direction of the swirling water film is opposite to the swirling flow direction of the generated gas and the counterflow state is established, the swirling flow of the generated gas will cause the surface flow of the wetting wall swirling flow of the cooling water to become turbulent. Water droplets can be generated from the surface to the entire interior of the downcomer pipe, and the contact area between the high-temperature gas and the cooling water can be dramatically increased, thereby increasing the efficiency of cooling the generated gas and collecting slag mist. .

If the downcomer is formed in a cylindrical shape to form a swirling water film, a uniform swirling flow of the cooling water wet wall can be formed, and the swirling flow of the gas generated from the reaction chamber can be maintained. On the other hand, by forming the downcomer into an inverted conical cylindrical shape, even if part of the cooling water evaporates and is lost due to contact with the hot generated gas, the swirling water film extends along the axial direction of the downcomer. Since the turning radius is set to be small, the water film thickness is made uniform, an appropriate thickness can be secured over the entire length of the downcomer, and the protection function of the downcomer can be maintained.

The number of cooling water injections used to form the wetting wall swirl flow formed on the inner wall surface of the downcomer pipe is one or more, and the total flow rate is the inner circumference of the top part of the downcomer pipe. 20 m ³ Zh per unit immersion length may be set to Z m or more. The wetted perimeter is the length of the side where the fluid is in contact with the solid wall when the fluid is flowing in a conduit or open channel. If the cooling water amount is less than the above value, the whole does not get wet when flowing on the surface of the downcomer due to insufficient cooling water, so that the swirling flow of the wetting wall cannot be formed on the entire surface. If the wet wall is not formed on the entire surface and becomes mottled, the molten slag flowing down from the reaction chamber adheres, and becomes nucleus, and the slag further adheres and blocks the downcomer pipe. In the area where the wetting wall is not formed, the hot gas from the reaction chamber and the inner wall of the downcomer (metal surface) come into direct contact and are locally exposed to high temperature. become. Therefore, in order to prevent the formation of a mottled pattern that is not partially wetted, it is necessary to set it to 20 m ³ ZhZm or more per unit immersion length of the inner circumference of the downcomer pipe top.

Further, the turning direction of the cooling water is opposite to the turning direction of the generated gas in the downcomer, and the gas swirling flow rate in the downcomer for generating water droplets in the entire downcomer is, for example, constant. In the case of a pressure system, it should be 3.0 mZ s or more. When the cooling water is swirled from the upper end of the downcomer and swirled in the opposite direction to the gas flow, the cooling water gradually increases as the cooling water flow speed increases. Since the surface is wavy and water droplets are formed, the gas-liquid contact area that comes into contact with the swirling gas coming from the reaction chamber is dramatically increased. However, when the swirling speed of the generated gas is less than 3.0 OmZs, the cooling water does not undulate and the generation of water droplets does not occur, and the cooling efficiency is low. Therefore, it is necessary that the gas swirl speed to generate waving on the surface of the swirl cooling water film is equal to or higher than the above value.

Further, the cooling water injection section provided at the top of the downcomer pipe may be configured such that a cooling water swirling flow path is formed on the outer peripheral side of the downcomer pipe to overflow the cooling water, or the cooling water is swirled inside the downcomer pipe. It can be configured as a guide plate system that forms a swirling water film by forming a flow path. BRIEF DESCRIPTION OF THE FIGURES

【Figure 1 】

FIG. 1 is a cross-sectional configuration diagram of a high-temperature swirl furnace used in the present invention having a reaction chamber and a gas quenching chamber.

【Figure 2】

FIG. 2 is a horizontal cross-sectional configuration view as viewed from an arrow A in FIG.

[Figure 3] FIG. 4 is a cross-sectional view showing an example in which the downcomer of the gas quenching chamber has a cylindrical shape.

[Fig. 4]

FIG. 4 is a horizontal sectional view of a cooling water injection unit in FIG. 3.

[Figure 5]

FIG. 6 is a cross-sectional view showing an embodiment in which the downcomer of the gas quenching chamber has an inverted conical cylindrical shape.

[Fig. 6]

FIG. 6 is a cross-sectional view showing an embodiment in a case where the cooling water injection of the gas quenching chamber is formed on the outer peripheral side of the downcomer and overflows.

[Fig. 7]

FIG. 7 is a horizontal sectional view of a cooling water injection part in FIG. 6.

[Fig. 8]

FIG. 7 is a cross-sectional view showing an embodiment in a case where a guide plate system in which cooling water is injected into a gas quenching chamber on the inner peripheral side of a downcomer pipe is used.

[Fig. 9]

FIG. 9 is a horizontal sectional view of the cooling water injection unit in FIG.

[Fig. 10]

FIG. 2 is a schematic sectional view showing an example of a conventional high-temperature syngas cooling device having a quenching chamber and a downcomer pipe.

BEST MODE FOR CARRYING OUT THE INVENTION

According to the present invention, when the cooling water is supplied from a cooling water injection portion provided at the top of the downcomer pipe in the gas quenching chamber to form a wetting wall, the swirling flow of the cooling water on the inner surface of the downcomer pipe descends. The basic feature is that cooling water is injected from the tangential direction in the horizontal section of the downcomer so that the swirling flow of the generated gas in the pipe is in the same direction or in the opposite direction.

FIG. 1 is a cross-sectional view of a high-temperature swirl furnace showing an apparatus configuration for realizing the method according to the present invention, and FIG. 2 is a horizontal cross-sectional view as viewed from an arrow A in FIG. This will be described below.

As shown in the figure, the above apparatus has an upper reaction chamber 1 into which gas generated in the pre-gasification step is introduced, and a lower gas quenching chamber 2. Both are communicated through a slot 3 with a small opening area. A downcomer 4 communicating with the throat section 3 is provided in the gas quenching chamber 2, and the lower end of the downcomer 4 is immersed in a quench bath 5 in the gas quenching chamber 2. The upper space of the gas quenching chamber 4 is divided inside and outside. Therefore, the gas from the throat section 3 is introduced into the upper space cooling area inside the downcomer 4 and then blown into the quench bath 5 to be blown up into the upper space of the gas quenching chamber 2 outside the downcomer 4 The molten slag flowing down to the gas quenching chamber 2 along the wall of the reaction chamber 1 and the slag mist in the gas are separated and cooled by the quenching bath 5 to become granulated slag, which is discharged. A slag discharge port 6 is provided at the lower end of the gas quenching chamber. Further, a gas outlet 7 is provided which communicates with the gas quenching chamber space on the outer peripheral side of the downcomer 4, from which the cooled gas is led out. A slag water outlet 8 is provided below the water level of the quench bath 5 in the gas quenching chamber 2.

In addition to this configuration, a cooling water injection section 9 is formed at the top of the downcomer pipe 4. The cooling water is supplied from the cooling water injection section 9 so that a wet wall is formed on the inner wall surface of the downcomer pipe 4. In this embodiment, the cooling water injection method is set to be tangential to the horizontal cross section of the downcomer pipe so that the wetting wall of the inner surface of the downcomer pipe 4 formed by the cooling water forms a swirling water film. The swirling flow of the wetting wall is made to be the same or opposite to the swirling flow of the generated gas in the downcomer pipe.

First, the configuration of the reaction chamber 1 will be described. In order to swirl the generated gas in the reaction chamber 1, as shown in Fig. 2, the gas introduction line was blown into the reaction chamber 1 with a circular cross section in the tangential direction of the virtual circle 10 of the swirling flow. It is set. In the high-temperature swirling furnace, for example, simultaneously with the gasification gas a supplied from the fluidized-bed gasification furnace, oxygen b and steam are also introduced into the furnace from the side of the reaction chamber 1 along the tangential direction of the virtual circle 10 of the swirling flow. c is supplied. As a result, the generated gas forms a swirling flow inside the reaction chamber 1.

The generated gas swirls and passes through the throat section 3 and is introduced into the downcomer pipe 4. The cooling water supplied from the cooling water injection section 9 causes the swirling flow of the generated gas in the downcomer pipe 4. A water film is formed as a swirling flow in the same or opposite direction. As shown in Fig. 3, the downcomer 4 has a cylindrical shape with a larger diameter than the throat 3, and the upper and lower edges are formed into a saw-tooth shape, while the lower edge is connected to the quench bath 5. It is immersed. The serrations at the top edge do not allow the wetting water film to drift when the cooling water overflows, even when the equipment is installed at an angle. Further, when the gas moves from the cooling bath 5 to the outer surface side of the downcomer pipe 4, the sawtooth at the lower edge can exert an effect of miniaturizing bubbles and increasing cooling efficiency. A trough 41 is formed around the top of the downcomer 4, and an overflow opening 4 2 is formed at the top of the downcomer 4 to allow the cooling water introduced into the trough 41 to overflow to the inner peripheral wall surface. I have. In this way, a water film is formed on the inner wall of the downcomer 4. This FIG. 4 shows a plan view of the downcomer 4 having the rough 4 1. The trough 41 is formed as a circumferential groove, and a cooling water supply pipe 43 is tangentially connected to the trough 41. Although one cooling water supply pipe 43 may be provided, it is desirable to connect a plurality of cooling water supply pipes at equal intervals in the circumferential direction in case of an unexpected event. This and can, Ri total flow rate of cooling water per unit Hitahen length inner periphery downcomer top as 2 0 m ³ or more Z h Z m, as the inner surface of the downcomer 4 is fully wetted-wall It is desirable to do it. As a result, the water flow in the trough 41 becomes a circumferential flow and overflows to the inner surface side of the downcomer pipe 4 through the overflow opening 4 2 to form a water film. The swirling flow occurs on the inner wall of Fig. 4 (solid arrow W in Fig. 4). This swirling flow direction is set to be the same as or opposite to the swirling direction of the swirling gas (the dashed arrow G in FIG. 4). The turning direction of the turning water film can be arbitrarily set by changing the connection direction of the cooling water supply pipe 43. If the cooling water is swirled in the direction opposite to the swirling direction of the generated gas in the downcomer (as shown in Fig. 4), the surface of the swirling water film will be ruffled and water droplets will be generated throughout the downcomer. In addition, the gas swirl velocity in the downcomer must be 3.0 / s or more in the case of a normal pressure system.

Figure 5 shows another example of the shape of the downcomer pipe. In this figure, a truncated inverted conical cylindrical downcomer 4 A is shown. By doing so, the turning radius of the turning water film decreases along the axial direction of the downcomer 4. The cooling water forming the swirling water film evaporates as it reaches the lower area of the conical downcomer 4A due to contact with the high-temperature generated gas, and the amount of water decreases, but the turning radius decreases. Therefore, a swirling flow of the wetting wall having a uniform thickness can be secured over the entire length of the conical downcomer 4A. The inclination angle of the conical downcomer 4A may be set in the range of 1 to 5 degrees, preferably 2 to 3 or 4 degrees with respect to the vertical plane. The angle should be set so that the thickness of the rotating water film can be equalized.

Figures 6 and 7 show other cooling methods to create a swirling swirling flow on the inner surface of the downcomer pipe 4. The water injection method is shown. This example shows the trough in the overflow weir system.

4 Place a buffer partition plate 1 1 in the center of the groove of 1 1 so that the effluent from the outlet of the cooling water supply pipe 4 3 does not go directly to the overflow opening 4 2 A. The lower edge of the partition plate 11 is once sunk into the trough 41 from the outer periphery of the trough 41 so as to uniformly overflow from the entire peripheral area of the overflow opening 42A. As a result, the flow rate of the cooling water in the trough 41 can be secured, so that when most of the slag water is recycled after purification, the fine particle slag that accompanies the cooling water but cannot be completely removed is used. Can be prevented from accumulating in the trough. Further, the thickness of the swirling water film formed on the inner wall surface of the downcomer pipe 4 can be made uniform in the circumferential direction. In FIG. 7, the solid arrow W indicates the flow direction of the cooling water, and the broken arrow G indicates the swirling flow direction of the gas. Although the above-described embodiment shows a method in which a cooling water swirl flow path is formed on the outer peripheral side of the downcomer 4 and overflows, the embodiments shown in FIGS. 8 and 9 show the inner periphery of the top end of the downcomer 4. A cooling water injection method is shown in which a swirling flow path is formed without attenuating the dynamic pressure energy of the cooling water on the side to form a swirling water film. A guide plate 12 having a cylindrical ring shape as a whole is attached inside the upper end side of the downcomer 4. The guide plate 12 has a funnel shape in which the upper half portion has an outer diameter gradually reduced from the inner diameter of the downcomer 4, and the lower half has a cooling water supply pipe 4 3 opened to the downcomer 4. As shown in FIG. 9, the cooling water from the cooling water supply pipe 43, which is formed in a small-diameter cylindrical shape facing the opening portion, flows from the tangential direction of the downcomer pipe 4 as in the previous embodiment. The introduced cooling water is swirled along the annular flow path formed by the downcomer 4 guide plates 12, and the opening between the downcomer 4 and the small-diameter tube portion of the guide plates 12 is opened. Flows out to the inner wall surface of the downcomer pipe 4. Since the guide plate 12 regulates the flow so as not to attenuate the dynamic pressure energy of the cooling water, a wet wall flow having sufficient swirling energy is formed on the inner wall surface of the downcomer 4. As a result, the entire cooling water is It can be made to act. In addition, since it is only necessary to dispose the guide plate 12 at the top of the downcomer pipe 4, the structure can be simplified. Although the guide plate 12 is exposed to the high-temperature gas, the cooling state is maintained by the cooling water, so that it is protected from thermal shock. In such a configuration, a swirl flow is formed on the inner wall side of the downcomer pipe 4, but the upper funnel-shaped portion of the guide plate 12 prevents the cooling water from scattering on the refractory brick on the reaction chamber 1 side. Is done.

When the swirling wetting wall flow is formed, the overflow weir method and the guide plate method are used, so that the water droplets of the cooling water do not scatter and wet the refractory brick in the throat section 3. Wetting the refractory bricks on the reaction chamber 1 side with cooling water rapidly cools the refractory bricks heated to high temperature, causing cracks. Therefore, by using the above-mentioned method, it is possible to form a swirling water film having a uniform thickness on the inner surface of the downcomer 4 without causing water droplets of the cooling water to scatter on the refractory brick.

At this time, the molten slag generated in the reaction chamber 1 flows down through the throat portion 3, and at this time, the refractory brick has a shape protruding from the throat portion 3. The distance S from the innermost part of the throat 3 to the downcomer 4 (see Fig. 1) is important. That is, when the distance S is short, when the molten slag flows down from the reaction chamber 1 through the throat section 3, the molten slag contacts as much as possible the cooling water forming the swirling water film on the surface of the downcomer pipe 4. It is better to prevent this, so it is important to keep the distance S appropriately so as to minimize the influence of the flow of the molten slag. For example, if the cooling water is too strong even if the distance S is maintained, the phenomenon of cooling the refractory bricks due to the splashing of water droplets will be caused. It is important to have.

The operation according to the above embodiment is as follows. The gas generated from the reaction chamber 1 passes through the throat section 3 to the gas quenching chamber 2 while maintaining the swirling flow. enter. Most of the molten slag generated in the reaction chamber 1 flows down to the gas quenching chamber 2 along the reaction chamber wall.Some slag mist is quenched from the throat section 3 while being entrained by the generated gas. Sent to chamber 2. The gas quenching chamber 2 quenches the hot gas generated in the reaction chamber 1 and separates and cools the molten slag flowing down to the gas quenching chamber along the wall of the reaction chamber and the molten slag mist accompanying the generated gas. Granulated slag.

The inside of the downcomer 4 of the gas quenching chamber 2 is exposed to the high-temperature atmosphere by the passage of the high-temperature generated gas and the molten slag. The inner surface of the downcomer 4 has a cooling water injection section 9 at the top The cooling water e supplied from the tangential direction to the horizontal cross section of the downcomer pipe 4 forms a swirling swirling flow, so that it is protected from thermal shocks and damage to the material can be avoided. It can flow down to the quench bath 5 without growing on the surface.

Here, a swirling water film is formed on the inner wall surface of the downcomers 4, 4A through which the swirling gas accompanying the slag mist flows and the molten slag flows down, forming a wet wall. If the swirling flow direction of the cooling water is the same as the swirling flow direction of the generated gas in the downcomer, the swirling flow of the generated gas is reliably maintained and promoted, and the slag mist accompanying the generated gas is maintained. Can be reliably trapped in the swirling flow of the cooling water on the inner surface of the downcomer pipe. Further, the swirling flow of the generated gas presses the wetting wall swirling flow of the cooling water in the circumferential direction of the inner surface of the downcomer pipe, so that the thickness of the wetting wall can be made uniform.

Conversely, if the direction of the swirling flow of the cooling water is opposite to the direction of the swirling flow of the generated gas, and the counterflow state is established, the swirling flow of the generated gas causes the surface flow of the swirling flow of the cooling water to become turbulent. It becomes wavy in a state, and water droplets can be generated from the surface to the entire inside of the downcomer pipe. This allows high-temperature generated gas and cooling The area of contact with water is dramatically increased, and the cooling effect of generated gas and the efficiency of collecting slag mist are improved. In addition, in order to generate water droplets in the entire downcomer, in the case of a normal pressure system, the gas swirling velocity in the downcomer must be 3.0 OmZs or more.

The high-temperature generated gas is in direct contact with the swirling flow of the cooling water formed on the inner surface of the downcomer pipe, thereby evaporating a part of the cooling water, which has the effect of cooling the generated gas. In particular, by forming the wetting wall swirling flow with the supply direction of the cooling water being opposite to the gas swirling direction, water droplets can be generated by waving, and the contact between the cooling water and the high-temperature gas is remarkable. As in the conventional case (Fig. 10), not only radiative heat transfer but also forced convection heat transfer is performed, so that the gas cooling efficiency is dramatically improved.

In addition, as shown in Fig. 3, by making the shape of the downcomer pipe 4 cylindrical, a uniform wetting wall swirling flow of the cooling water can be formed and the swirling flow of the generated gas from the reaction chamber 1 is maintained. be able to. Furthermore, as shown in Fig. 5, the inverted conical cylindrical shape reduces the turning radius of the cooling water film even if a part of the cooling water evaporates and is lost due to contact with the high-temperature generated gas. Therefore, it is possible to ensure a moderately thick swirling flow.

As described above, according to the present invention, the flow of the wetting wall of the cooling water on the inner surface of the downcomer pipe is cooled by direct contact of the high-temperature generated gas with the cooling water and evaporation of a part of the cooling water. At the same time, the flow of the wetting wall can be used as a swirling flow, and the streamline length of the cooling water can be increased to prolong the contact time with the swirling gas. This significantly improves the gas cooling efficiency and the slag mist collection efficiency of the swirling water film. In particular, by setting the swirling flow direction in the opposite direction to the swirling direction of the generated gas, countless water droplets are generated from the surface of the wetting wall, and the contact area with the gas is increased, resulting in more effective generation. The gas can be cooled. 'Even if the swirling flow direction of the cooling water is the same as the swirling flow direction of the generated gas, 5 By the pressure of the generated gas, slag mist can be collected while maintaining the swirling flow of the water film, and the thickness of the wet wall can be maintained uniformly. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention can be used in a high-temperature swirl furnace used when burning combustible waste to gasify or coal.

Claims

The scope of the claims

1. A method of cooling the generated gas by blowing gas generated in the reaction chamber of the high-temperature swirling furnace into a quenching chamber having a quenching bath through a downcomer pipe, and collecting slag mist accompanying the gas. And

A cooling water film formed by supplying cooling water to the inner wall surface of the downcomer pipe as a swirling water film flowing in a circumferential direction of the downcomer pipe, wherein cooling of the generated gas and accompanying slag mistakes are performed. How to collect birds.

2. The method for cooling generated gas and collecting accompanying slag mist according to claim 1, wherein the swirling water film is brought into countercurrent contact with the generated gas in a direction opposite to the direction of rotation of the generated gas.

3. The water film thickness is made uniform by setting the swirling water film so as to have a small turning radius along the axially downward direction of the downcomer pipe, so that the generated gas cooling and cooling can be performed. Collection method of accompanying slag mist.

4. A method of cooling the generated gas by blowing gas generated in the reaction chamber of the high-temperature swirling furnace into a quenching chamber having a quenching bath through a downcomer pipe and collecting slag mist accompanying the gas. And

A cooling water film formed by supplying cooling water to the inner wall surface of the downcomer pipe is formed as a swirling water film flowing in the circumferential direction of the downcomer pipe, and is formed in a direction opposite to the swirling direction of the generated gas. The downflow pipe is formed in an inverted conical cylindrical shape so as to be in countercurrent contact with the generated gas, and the swirling water film is set so as to have a small turning radius along the axial downward direction of the downcomer pipe. A method for cooling generated gas and collecting accompanying slag mist.

5. The injection number of the cooling water is a one if Ku is more present, it is the sum flow amount 2 0 m ³ / h Z m or more per unit Hitahen length inner periphery downcomer top請Motomeko The method according to any one of 1 to 4.

6. The swirling direction of the cooling water is opposite to the swirling direction of the generated gas in the downcomer, and the gas swirl flow rate in the downcomer for generating water droplets in the entire downcomer is normal pressure system. The method according to any one of claims 1 to 4, wherein the case is 3.0 mZs or more.

7. The method according to any one of claims 1 to 4, wherein the cooling water injection section provided at the top of the downcomer forms a swirling flow path on the outer peripheral side of the downcomer to overflow.

8. The cooling water injection section provided at the top of the downcomer forms a swirling flow path on the inner peripheral side of the downcomer and flows down to the inner wall surface of the downcomer. The described method.