JPH09227879A - Entrained coal gasifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an entrained coal gasifier having improved efficiency of collecting molten slag and made proof against its scattering. SOLUTION: One to several downwardly inclined pulverized coal burners 3 are secured on one side of a combuster 1, and two charr burners 4 are secured at position higher than that of the burners 3 on the oven wall on the side opposite to the burners 3 symmetrically about the center of the flow from the burners 3. A gas oil burner 8 opposite to the burners 3 is secured, and a gas oil ignition torch 9 is attached to the position rotated by 90 deg. from that is attached. Under these, a slag tap 6 is provided, and water 10 is placed through a space 7. A reductor burner 5 is attached to a reductor 2. Since the burners 3 and the burner 4 are inclined downwardly, and no burners are present on the opposite wall, air 11 flows downwardly in the form of a large arc, slag particles 12 collide against the oven wall due to the centrifugal force, collected, fall on slag tap 6, fall into water 10, cooled and discharged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spouted bed coal gasification furnace which improves the collection efficiency of molten slag and prevents scattering.

[0002]

2. Description of the Related Art FIG. 8 is a front view (including a partial cross section) of a conventional spouted bed coal gasification furnace, FIG. 9 is its EE cross section, and FIG.
0 is the FF sectional view. In these figures, a cylindrical combustor 01 has a plurality of (four in the figure) pulverized coal burners 03 arranged in the same cross section as shown in FIG. As shown, a plurality of char burners 04 are similarly attached (four in the figure). At one end of the combustor 01 is connected a reductor 02 that expands in a conical shape after the cross-sectional area is reduced. This reductor 02 is provided with a raw material pulverized coal jet reductor burner 05 for thermal decomposition. There is.

Below the combustor 01, the combustor 0
A slag tap 06 for partitioning 1 is provided, and a diesel fuel burner 08 is provided on one side of the same cross section in the diesel fuel precombustion chamber 07 below this.
And a light oil ignition torch 09 is attached to the other opposite side. Reference numeral 010 is water for cooling the falling slag.

[0004]

In the above-mentioned conventional spouted bed coal gasification furnace, combustor 01 burns pulverized coal or char as fuel, and the residual slag is attached to the wall surface of combustor 01. Then, it is allowed to flow downward by gravity, dropped into water 010 stretched under the light oil pre-combustion chamber 07 through a slag tap 06, cooled, and then crushed by a crusher (not shown).

In this case, the movement of the particle flow 012 of the slag to the wall surface of the combustor 01 is caused by the air flow 011 accompanied by swirling by the pulverized coal burner 03 and the char burner 04 installed in the direction displaced from the central axis of the combustor 01. It is caused by the centrifugal force it receives.

However, if the swirling force of the burner jet is made too strong, the gas flow velocity becomes large on the wall surface of the throttle portion between the combustor 01 and the reductor 02, whereby the molten slag on the wall surface scatters and the particles become particles in the reductor 02. Since it is transferred to the upper part of the container and adheres to the cold wall and solidifies, this must be avoided. Therefore, the amount of the molten slag attached to the wall surface of the combustor 01 is reduced (collection efficiency is reduced).

[0007]

The present invention provides the following means (1) and (2) in order to solve such problems.

(1) A pulverized coal burner, a char burner provided above the pulverized coal burner, and a slag tap provided below the pulverized coal burner, and a cylinder for burning the pulverized coal and char to generate high-temperature gas. In a spouted bed coal gasification furnace, in which a raw material pulverized coal nozzle for supplying a raw material pulverized coal for producing a combustible gas by thermal decomposition is attached, and a reductor connected to the combustor, The burner is on one side wall of the combustor,
The char burner is attached downwardly toward the center of the slag tap; the char burner is an obliquely opposed position to the pulverized coal burner and is evenly arranged on the combustor wall so as to be symmetrical with respect to the pulverized coal burner. Installed; a light oil burner at a position facing the pulverized coal burner of the combustor,
A torch for light oil ignition on the combustor wall in the middle of both burners,
The pulverized coal nozzle for raw material of the reductor is attached obliquely downward toward the center of the slag tap; Spout bed coal gasifier.

(2) In the above-mentioned (1), the center of the slag tap is deviated from the central axis of the combustor to the side opposite to the mounting position of the pulverized coal burner.

According to the present invention, according to the means (1), the pulverized coal burner has only one side wall and is mounted downward, so that the jet flow of the burner has an arc. It reaches the lower part, and because there is no other burner on the opposite side of the pulverized coal burner as in the conventional case, it easily reaches the opposite wall of the combustor and then ascends the combustor.

Similarly, the jet flow from the char burner above it does not interfere with other burners, and since even-numbered pieces are symmetrically mounted facing the pulverized coal burner, uniform jetting is achieved. A large downward flow reaches the opposing wall of the combustor in an arc, then rises.

In the means of (2), since the center of the slag tap is displaced from the center axis of the combustor to the opposite side of the position of the pulverized coal burner, the flow resistance due to the slag tap upper structure against the pulverized coal burner jet is reduced, and the jet flow The amount of slag reaching the wall surface of the combustor can be increased, and the slag collection efficiency can be further increased as compared with (1).

As described above, since the gas flow due to the jets of the pulverized coal burner and the char burner has a large curvature, the slag particles having a larger specific gravity than the gas shift from the flow line of the flow due to the inertial force (centrifugal force), It collides with the wall of the combustor and is collected on the wall.

Therefore, the efficiency of collecting the slag is improved, and the slag is scattered and transferred to the upper part of the reducer as in the conventional case.
By adhering to the low temperature wall of the reductor and not solidifying, and by supplying the raw material pulverized coal of the reductor and arranging the raw material pulverized coal nozzle in a tilted manner in the circumferential direction, combustible gas generation by thermal decomposition is efficiently performed. Further, the molten slag flowing down the slag tap also has a good flow-down property because the light oil burner and the light oil ignition torch are transferred from the combustor without the conventional light oil precombustion chamber.

[0015]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a front view including a partial cross section of a spouted bed coal gasification furnace according to a first embodiment of the present invention, which is shown in comparison with the conventional one in FIG. 8 and is entirely configured in a cylindrical wall. . 2 and 3 are cross-sectional views taken along the line AA, showing an attached state of the pulverized coal burner 3. FIG. 2 shows an example with one burner, and FIG. 3 shows an example with two burners. FIG.
1 is a sectional view taken along the line BB in FIG. 1 and shows a mounted state of the char burner 4, and FIG. 5 is a sectional view taken along the line C-C in FIG. 1 and shows a mounted state of the reducer burner 5.

In these figures, each component name is the same as that of the conventional example of FIG. 8, and the reference numeral is omitted by omitting "0" for the sake of comparison with the conventional example. These constituent parts have been described in the conventional example, but if explained again for the sake of organization, 1 is a cylindrical combustor, 2 is a reducer, and 3 is a
Is a pulverized coal burner, 4 is a char burner, 5 is a reductor burner, 6 is a slag tap, and 7 is a light oil pre-combustion chamber with reference numeral 07 in the past, but in the first embodiment of the present invention, this is abolished. It's just a space. Reference numeral 8 is a light oil burner, 9 is a light oil ignition torch, and these 8 and 9 are moved from the conventional light oil pre-combustion chamber to the upper portion of the slag tap 6. 10 is water for cooling slag, 11 is air flow, 12 is pulverized coal burner 3
Or it is the flow of particles from the char burner 4.

In such a structure, the pulverized coal burner 3
Is the center of the slag tap 6 with one to several (one in FIG. 2 and two in FIG. 2) examples on one side of the combustor 1 as shown in the AA cross-sections shown in FIGS. It is installed diagonally downward aiming at, and the char burner 4 is moved 180 ° from the position of the pulverized coal burner 3 with respect to the flow center of the pulverized coal burner 3 as shown in the BB sectional view of FIG. Are installed symmetrically.

The reductor burner 5 is mounted so as to be displaced from the central axis of the reductor 2, and several reductor burners 5 are installed in a direction accompanied by a swirl flow (four examples are shown in FIG. 5).

As shown in FIG. 3, the light oil burner 8 and the light oil ignition torch 9 are installed in the combustor 1, and the light oil burner 8 faces the pulverized coal burner 3 and is 90 ° out of phase with the light oil ignition torch 9. Are installed respectively.

Inside the combustor 1, a pulverized coal burner 3
Then, the air flow 11 due to the downward jet of the char burner 4 above it draws a large arc, reaches the opposing wall, and then rises.

The flow 12 of slag particles generated by the combustion of pulverized coal and char has a larger specific gravity than gas, is deviated from the streamline by centrifugal force, collides with the wall surface of the combustor 1 and falls to the slag tap 6. The slag particles that have fallen fall into the water 10 below the slag tap 6, are cooled, then are crushed by a crusher (not shown), and are discharged to the outside.

In the spouted bed coal gasification furnace of the first embodiment described above, since the pulverized coal burner 3 is mounted downward, the air flow 11 from the burner 3 reaches the lower part of the combustor 1 in an arc. Further, since there is no other burner on the opposite side of the pulverized coal burner 3, the air flow 11 reaches the opposite wall, and thereafter rises in the combustor 1.

Similarly, since the air flow 11 from the char burner 4 does not interfere with other burners, it becomes a large downward flow, reaches the opposing wall while drawing an arc, and then rises.

As described above, since the gas flow 11 formed by the jets of the pulverized coal burner 3 and the char burner 4 has a large curvature, the flow 12 of slag particles having a larger specific gravity than the gas is generated by inertial force (centrifugal force). Deviation from the streamline of the flow,
It collides with the wall surface of the combustor 1 and is collected on the wall surface.

The collected slag particles fall on the slag tap 6, the conventional light oil pre-combustion chamber is eliminated, and the light oil burner and the light oil ignition torch are moved into the combustor 1, so that the downflow property becomes good.

FIG. 6 is a partial cross-sectional view of the jet bed coal gasification furnace according to the second embodiment of the present invention. The same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals. . The part different from the first form is a slug tap 16 and the other parts are the same as the first form. FIG. 7 is the DD arrow view.

As shown in FIGS. 6 and 7, the slag tap 16 according to the second embodiment of the present invention has its center deviated from the central axis of the combustor 1 to the opposite side of the pulverized coal burner 3. The structure of the tap 16 can increase the amount of the jet 12 of the pulverized coal burner 3 reaching the wall surface of the combustor 1 and can be expected to increase the slag collecting efficiency. Other configurations and operations are the same as those of the first embodiment shown in FIG. 1, and therefore description thereof will be omitted.

[0028]

As described above in detail, the present invention provides a pulverized coal burner, a combustor having a char burner above it and a slag tap below the pulverized coal burner, and a reductor having a pulverized coal nozzle for raw materials. In a spouted bed coal gasification furnace consisting of, a pulverized coal burner is attached to one side wall of the combustor, the center of the slag tap is directed, and an even number of char burners are installed symmetrically at diagonally opposite positions of the pulverized coal burner. Install a light oil burner at a position facing the pulverized coal burner, install a light oil ignition torch on the intermediate combustor wall between both burners diagonally downward toward the slag tap, and remove the pulverized coal nozzle for the raw material of the reducer from the center. , It has a configuration in which it is installed so as to be inclined in the circumferential direction, and it is also characterized by a configuration in which the center of the slag tap is displaced from the pulverized coal burner. UNA is an effect.

(1) The collection efficiency of slag particles can be improved by colliding the jet streams of the pulverized coal burner and the char burner with the combustor furnace wall.

(2) By directing the pulverized coal burner toward the slag tap, the collection efficiency of the molten slag can be improved, and the temperature of the molten slag flowing down the slag tap can be maintained to obtain good flowability.

(3) By directing the char burner downward, the char ignitability is improved by ejecting char into the combustion flame of pulverized coal.

(4) Since the swirling force of the burner jet is not used in the gasification furnace, the gas flow velocity is not increased even on the wall surface of the throttle portion, so that the molten slag is prevented from scattering.

(5) By shifting the slag tap from the center of the combustor to the opposite side of the pulverized coal burner, the flow resistance due to the tap superstructure for the pulverized coal burner jet is reduced and the amount of the jet reaching the combustor wall is increased to collect the slag. We can expect an increase in efficiency.

[Brief description of drawings]

FIG. 1 is a front view including a partial cross section of a spouted bed coal gasification furnace according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1, showing an example of one pulverized coal burner.

FIG. 3 is a sectional view taken along the line AA in FIG. 1, showing an example of two pulverized coal burners.

FIG. 4 is a sectional view taken along line BB in FIG. 1;

FIG. 5 is a sectional view taken along line CC in FIG.

FIG. 6 is a front view including a partial cross-sectional view of a spouted bed coal gasification furnace according to a second embodiment of the present invention.

FIG. 7 is a view on arrow DD in FIG.

FIG. 8 is a front view including a partial cross section of a conventional spouted bed coal gasification furnace.

FIG. 9 is a sectional view taken along the line EE in FIG. 8;

10 is a sectional view taken along line FF in FIG.

[Explanation of symbols]

 1 Combustor 2 Reductor 3 Pulverized coal burner 4 Char burner 5 Reductor burner 6,16 Slag tap 8 Light oil burner 9 Light oil ignition torch 10 Water 11 Air flow 12 Particle flow

Claims (2)

[Claims] 1. A cylindrical shape having a pulverized coal burner, a char burner provided above the pulverized coal burner, and a slag tap provided below the pulverized coal burner, for burning the pulverized coal and char to generate high temperature gas. In a spouted bed coal gasification furnace having a raw material pulverized coal nozzle for supplying raw material pulverized coal for producing combustible gas by thermal decomposition, and a reductor connected to the combustor. Is attached to one side wall of the combustor downwardly toward the center of the slag tap; the char burner is at a position diagonally opposite to the pulverized coal burner and symmetrical to the pulverized coal burner. An even number of such burners are mounted on the wall of the combustor; a light oil burner is provided at a position facing the pulverized coal burner of the combustor, and a combustor in the middle of both burners. The light oil ignition torches were attached to the walls in a diagonally downward direction toward the center of the slag tap; and the pulverized coal nozzle for raw material of the reducer was tilted in the circumferential direction with the ejection direction removed from the center of the reducer. A spouted bed coal gasification furnace characterized by being installed. 2. The spouted bed coal gasification furnace according to claim 1, wherein the center of said slag tap is displaced from the central axis of the combustor to the side opposite to the mounting position of the pulverized coal burner.