JPS6099910A - Powder solid fuel rotary injection burner - Google Patents

Abstract

PURPOSE:To improve the stability of flame by a method wherein some nozzles for blowing toward the central axis are combined, a solid and gas mixed phase flow of powder solid fuel with a rich concentration is blown from the burner nozzles of a small diameter under its varied circulating speed. CONSTITUTION:A burner is composed of a circulating speed acceleration part 44, fine powder coal blowing nozzles 43 and 42 and burners 45, 46 and 47, an entire burner is of a triple tube and water cooled by cooling water 41 passing through a cooling pipe 47. The fine powder blowing nozzles 42 and 43 are composed of a circulating supply nozzle 43 and a central direction supplying nozzle 42. The circulating force is strengthened in response to a load and in case that the mixing is made fast, an amount of blowing coal from the circulating direction supply nozzle 43 is increased. In turn, in case that the circulating force is decreased, an amount of supplying from the central direction supplying nozzle 42 is increased. With this arrangement, in case that it is required to vary the amount of mixed phase flow from the central direction and circulating direction supplying nozzle is varied and then the circulating force is varied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a burner used in a solid fuel gasification device such as a spouted bed, and in particular, to a burner used in a solid fuel gasification device such as a spouted bed.
The present invention relates to a powder solid fuel gasification burner suitable for blowing out solid fuel from a small-diameter burner nozzle by easily changing the rotation speed.

[Background of the invention]

In order to promote the gasification of solid fuel throughout the furnace, it is important to improve the performance of a single burner, and it is possible to improve the efficiency by adding swirl to the fuel and gas blown out from the burner. is well known.

Swirling has the effect of laminarizing the turbulent jet flow generated by the burner, so it can promote the mixing of gas and fuel, increase the stability of the flame, and exhibit good reaction characteristics.

Basically, there are 31 ways to generate a turn:
become similar. 1) All of the fluid in the tubular duct, or
A part of it is introduced tangentially (%Kasho 51-10332
6). 2) Attach a guide vane to the axial flow inside the pipe. 3)
By rotating the mechanical device, swirling motion is imparted to the passing fluid. The advantage of method 1), in which fluid is blown into the tubular duct in a direction perpendicular to the depth, is that the mechanism is simple. 2
) is the most commonly used method for controlling the guide vanes, and has the advantage that the H4 structure is simple and it is easy to create complex swirling flows. The method 3) of mechanically applying a swing has the advantage that the strength of the swing can be determined completely accurately, but it is not practical because it requires other power and the device becomes complicated.

Gasification of powdered solid fuels generally requires a reduction in the amount of carrier gas, which increases the density of the solid fuel in the multiphase flow. However, when swirling this multiphase flow, 2)
When using guide vanes, the wear of the guide vanes is extremely undesirable due to the high density of the powdered solid fuel. In addition, in the method of 1) injecting fluid into the confession duct, it is difficult to increase the injection speed because the diameter of the tubular duct is large, and pressure loss occurs when fluid is injected into the tubular duct. There are problems such as getting bigger. Furthermore, it is difficult to change the rotation speed during operation using either method.

[Purpose of the invention]

An object of the present invention is to provide a powdered solid fuel gasification burner suitable for blowing out a dense solid-gas mixed phase flow of powdered solid fuel from a small-diameter burner nozzle by easily changing the swirling speed.

[Summary of the invention]

Generally, the strength of swirling decreases as the distance from the position where the swirling flow is generated decreases. However, when swirling occurs within a limited volume, the swirling force is maintained as the cross-sectional area decreases. Based on this principle, the inventors have discovered that by reducing the cross-sectional area, it is possible to maintain the turning force even if the turning occurs at a distant position. Furthermore, by using this method, the cross-sectional area of the burner nozzle can be reduced, so it is possible to increase the blowing speed. Furthermore, when applying swirling force to a dense multiphase flow of powdered solid fuel, it is undesirable to bend the multiphase flow at right angles using guide vanes, tubular bends, etc. in terms of wear and tear. By using the cyclone principle, it is possible to prevent damage by directly blowing a multiphase flow into a cylindrical container from the tangential direction, and by combining a nozzle that blows toward the central axis, The inventors have discovered that it is possible to adjust the turning force.

The present invention is supported by a plurality of such principles, and the inventors paid attention to this fact and skillfully applied this principle to a powder solid fuel gasification burner.

[Embodiments of the invention]

FIG. 1 shows an example of a coal gasification apparatus using a kumquat according to the present invention. The entire system consists of a pulverized coal supply device, a coal gasifier main body, a produced gas purification device, and a molten slag discharge device.

The pulverized coal supply device will be explained next. Coal is pulverized to less than 200 mesh 80w1%, pulverized coal 1%,
It is sent to the pressurizing hopper 2. The pressure hopper 2 is directly connected to the supply hopper 3, and the pulverized coal is transferred from the pressure hopper 2 to the supply hopper 3. The pulverized coal is then mixed in the feeder 9 with nitrogen 4 supplied in a suitable amount by the controller 8. Then, an appropriate amount is distributed and supplied by the distribution amount adjusting device 26 according to the load amount.

It is then blown into the burner 10 using the present invention.

The coal gasifier main body will be explained. The gasifier 17 is
It is divided into a gasification reaction section and a slag separation section. The gasification reaction section includes a burner using the present invention which supplies oxygen 6 as a gasifying agent and 1 fc of pulverized coal, which are supplied in an appropriate amount to a controller 13, and a burner using the present invention, which is supplied with an appropriate amount of gasifying agent 11411+1 in a total of 15. A char burner 32 is installed that supplies oxygen 6 and recycled char in the form of sleeves from the generated gas. Further, a slag tap 20 is installed between the gasification reaction section and the slag separation section. On the other hand, a slag tub heat retention burner 19 is installed in the slag separation section. The slag tap heat retention burner 19 is blown with auxiliary fuel 5 supplied in an appropriate amount by the controller 11 and oxygen 6 supplied in an appropriate amount by the regulator Itt14.

The produced gas purification processing device is composed of a char collecting section and a desulfurization section. The char is separated into coarse particles and fine particles and collected by a cyclone collection device 28 and a bag filter 35.

The collected char is collected in the char hoppers 29 and 26, pressurized with nitrogen 4, and transferred to the char supply bobber 30. Therefore, in the char supply feeder 31, the nitrogen 7 supplied by the char supply 1F7 is sent to the burner 32 and the gasifier 1 is fed as necessary.
7 gets blown 1. The generated gas with the char collected becomes a fuel gas 38 after the negative sulfur content 4o is removed by a desulfurization device 37.

The molten slag discharge device includes a molten slag collection popper 21,
It's a cooling water circulation system. A small amount of slag dripped into the slag tap 20 is stored in a water layer at the bottom of the furnace, and then transferred to a slag collecting device 21. The slag 23 is then separated and discarded by the cooling water 39 (!) in the slag separator 22. On the other hand, the cooling water 39 is returned to the slag collecting device 21 by the pop 24.

Next, details of the burner using the present invention are shown in Figures 2 to 4.
This will be explained using figures. The whole consists of a rotating speed accelerator 44, pulverized coal injection nozzles 43, 42. Burner part 45, 46.47
Consists of. The entire burner is triple-pipe, with 4 cooling pipes.
It is water-cooled by cooling water 41 passing through seven passages.

There are two types of pulverized coal injection nozzles 42 and 43: a rotation direction supply nozzle 43 and a center direction supply nozzle 42. (FIG. 3) Here, if the swirling force is to be increased to speed up the mixing according to the load amount, the amount of blowing from the swirling direction supply nozzle 43 is increased. Conversely, when reducing the turning force, the supply amount of the center direction supply nozzle 42 is increased. Therefore, when the coal type etc. changes and it becomes necessary to change the mixing state, the opening side 1 device 26 can be used to completely change the amount of multiphase flow of the center direction and swirling direction supply nozzles. Change everything. Furthermore, since it is not preferable to supply pulverized coal only from the central direction supply nozzle 42 because of the problem of abrasion of the rotation speed accelerating section, the pulverized coal 1'f: is supplied from the rotation direction supply nozzle 43.

The turning force is adjusted to 4 options: 1. The pulverized coal l is sent to the pulverized coal supply pipe 43 with a stronger swirling force than the rotating speed chain section 44vc. Here, the turning speed accelerator 44 is
It has a conical structure. Therefore, when the diameter of the swirl (vortex) is small, the swirl speed is accelerated.

The pulverized coal that has been given a strong swirling force is transferred to the pulverized coal supply pipe 45.
It is sent into the p gasifier. And pulverized coal outlet 4
The pulverized coal 1 blown out from the pulverized coal 1 is sent to the oxygen supply 46, mixed with the 1:p blown oxygen 6 into the oxygen blowing nozzle 48, and gasified.

The oxygen blowing nozzle 48 is opened so as to blow out oxygen while maintaining a specific angle with respect to the axis. (Figure 4) This angle is
This is the same direction as the rotating direction of the pulverized coal 1, and thereby the pulverized coal 1 is further rotated.

Due to the above principle, the pulverized coal 1 is swirled strongly, so that the coarse particles that require a longer reaction time are collected and shredded by the centrifugal force on the outside of the center, and the outer part is the gasifying agent. Since the concentration is high, the reaction rate is quick and the reaction is completed quickly, achieving a highly efficient reaction. ■Because of the negative pressure generated near the center, the ignition source exists near the blowout l:lK, forming a stable flame. ■Effects such as promoting the mixing of pulverized coal and gasifying agent are produced1. Further, since the center direction supply nozzle is installed, the swirling force can be greatly and steplessly changed during operation, so the mixing state of the gasifying agent and fuel can be changed completely freely.

Next, details of Example 2 of the rotary burner will be explained with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view of Example 2. FIG. 6 is a cross-sectional view taken along arrows 1 to 2 in FIG.

In this embodiment, the turning speed accelerator 44 is extended to the blow-off nozzle 47 of the burner. When this embodiment is used, since the swirling force is strengthened up to the burner nozzle 47, an even stronger swirling force can be applied to the swirling flow of the pulverized coal 1.

Moreover, as shown in FIG. 6, the central direction supply nozzle 4
Four supply nozzles 2 and four rotational direction supply nozzles 43 are installed. As a result, a swirling flow with better dispersion of the pulverized coal is formed compared to a single blowout nozzle, so that contact with the gasification agent 6 is made uniform, and highly efficient gasification is possible.

An embodiment in which the present invention is integrated with a gasifier 17 is shown in FIGS. 7 and 8. The effect of this embodiment is that the throughput of pulverized coal 1 can be increased.

〔Effect of the invention〕

According to the present invention, a dense solid-gas two-phase flow of solid fuel,
Since it is possible to blow out from a burner nozzle with a small diameter while changing the rotation speed during operation, it is possible to improve the load fluctuation of the solid fuel gasification burner and to improve the vortex rate.

[Brief explanation of the drawing]

Figure 1 is a flow sheet of the coal gasifier of the present invention;
The figure is a sectional view of one embodiment of the present invention, and FIG. 3 is the
■A sectional view taken along the arrows; FIG. 4 is a sectional view taken along the IV-IV arrow in FIG. 2; FIG. 5 is a sectional view of another embodiment of the present invention; FIG.
7 is a cross-sectional view of still another embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. 7 (2).
It is. 42... Center direction fuel supply nozzle, 43... Turning direction fuel supply nozzle, 44... Turning force acceleration container, 48...
...#20 A long time ago. Continuation of 1st page 0 Inventor Hitoshi Tomuro - Inside Saiwai-cho, Hitachi City 0 Inventor 1) Shinji Naka Inside Saiwai-cho, Hitachi City

Claims (1)

[Claims] 1. The above method is achieved by superimposing a plurality of circular pipes on the same axis, supplying powdered solid fuel and its carrier gas through the central fuel supply pipe, and mixing it with the gasifying agent at its tip. In a burner that gasifies powdered isomorphic fuel, a cylindrical bunker or a conical container is used.
A rotating feeder having a fuel supply nozzle oriented tangentially and centrally to the axis is installed coaxially with the inlet of the fuel supply pipe, and means for supplying fuel at high speed from the fuel supply nozzle is provided. A powder solid fuel swirl jet burner characterized by: 2. In claim 1, the fuel supply pipe has a conical shape whose diameter decreases in the direction of fuel flow, and mJ fuel supply nozzles are provided tangentially to the axis and toward the center. A powder solid fuel swirl jet burner characterized by: 3. Claim 1, further characterized in that a plurality of gasifying agent injection holes are provided around the outlet of the fuel supply pipe at a specific angle with respect to the axis. Powdered solid fuel swirl jet burner. 4. The powder solid according to claim 2, characterized in that a plurality of gasifying agent injection holes are provided around the outlet of the fuel supply pipe at a specific angle with respect to the axis. Fuel swirl jet burner.