JPH02206687A - Cooling type blowing burner - Google Patents

Abstract

PURPOSE:To prevent the wear and temperature raising of portions near the tip of a burner by superimposing a plurality of inner tubes on the same axis and disposing such a passage as bringing a cooling water into contact with the outer wall near the tip of an inner tube and with the inner wall of the tip of a burner at a high speed. CONSTITUTION:A cooling water 3 is supplied to a raw-material-blowing nozzle 11 of the tip 19 of a burner through a cooling water-supplying passageway 7 of a cooling water-supplying tube 17 to cool the outer wall of an inner tube near the exit of the inner tube through an outer wall cooling water passageway 12 near the exit of the inner tube. The cooling water is subsequently returned into an existing apparatus-cooling water-returning line through a burner tip inner wall, a tapered inner wall-cooling passageway 18, a cooling water-returning passageway 6 in an outer tube 9 and a burner-cooling water line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooled jet burner for use in a spouted bed powder solid fuel gasifier.

[Conventional technology]

Coal has the largest reserves of all fossil fuel resources and is
It is attracting attention as an energy alternative to oil.

Coal is solid and inconvenient to handle, and it also contains ash, sulfur, nitrogen, etc. In order to use it effectively, it is necessary to
It is desirable to convert it into a clean energy source by liquefaction, gasification, etc. and use it.

Coal gasification is currently attracting attention as a promising method for turning coal into a clean fuel. Among these, the coal gasification combined cycle system, which uses clean gas from coal for power generation, is attracting attention. One of the key technologies supporting the coal gasification combined cycle system is coal gasification technology, and as a gasifier for power generation, it has high gasification efficiency, operability and reliability that can meet electricity demand, and adaptability to a wide range of coal types. etc. are required. As a gasifier that satisfies these conditions, a spouted bed gasifier in which pulverized coal is reacted in a stream is considered to be promising.

FIG. 12 is a schematic diagram of a gasifier using this jet tank gasifier. This apparatus consists of a coal supply system, a gasification agent supply system, a gasification furnace 30, a dust collection system 34, a desulfurization system 35, and the like.

In the coal supply system, powdered solid fuel 49 that has been crushed and classified by a crusher is supplied from a raw material conveyance line 47 to a normal pressure hopper 48 , and then charged into a pressurized hopper 22 , and then transferred to a supply hopper 23 .
supply to After that, the powdered solid fuel 49 is fed to the feeder 45.
After quantification with a carrier gas (nitrogen or inert gas) 24
The raw material transport line 25 is circulated using the gasifier 30.
supply to. On the way, there is a distributor 26 that can evenly distribute and supply the raw material to several jetting burners 27 .

In the gasification agent supply system, an oxygen or air control valve 28, a steam control valve 29, upper and lower gas and other agent supply system lines 40.4
The gasifying agent is passed through the gasifier 1 and is further supplied to the gasifier 3 through the raw material injection burner 27. Powdered solid fuel (
(coal or liquefaction residue, etc.) 49 and the gasification agent are transferred to the gasification furnace 3.
Contact is made at the outlet of the raw material jetting burner 27 in the 0.

The gasifier 30 has a structure lined with fireproof bricks or the like. Since the inside of the furnace is at a high temperature of 1,400°C or higher, the ash in each coal becomes molten into a slab.

This human lag falls freely, enters the slag hopper 32 filled with water, is rapidly cooled and solidified, and is extracted to the outside.

The gas generated from the gasifier 30 passes through the gasifier outlet line 33, the dust collector 34, and the desulfurizer 3S, and the char and dust containing incombustible carbon, which are scattered together with the generated gas, are collected in the generated gas. After removing the hydrogen sulfide, the gas is supplied to a turbine or the like through a line 36 as a clean gas.

The gasifier 30 installed in these reactors is filled with powdered solid fuel (coal, liquefied residue, etc.) 49 as described above.
There is a supply system, and a raw material injection burner 27 is always provided on the gasifier 30 side.

This raw material injection burner 27 is one of the important devices that can generate gas rich in H2, C₂, etc. by bringing the powdered solid fuel 49 and the gasifying agent into contact with each other inside and outside the burner to cause a reaction.

In this case, depending on the burner structure, the powdered solid fuel may be near the outlet of the inner cylinder pipe (inside the powdered solid fuel supply pipe).

It accumulates at the tip of the burner and becomes clogged, making continuous supply difficult. In addition, the temperature near the burner tip and the outlet of the inner tube increases due to the burner tip cooling structure and secondary radiation heat from inside the gasifier, and depending on the type of powdered solid fuel, the carbon content in the powdered solid fuel is combusted. This solidifies and accumulates near the tip and the outlet of the inner tube, making it difficult to supply powdered solid fuel, making the cooling structure of the burner tip extremely important.

Conventionally, the following method is typical as a method for cooling the inside of a burner tip.

(1) A method of suppressing the temperature rise near the outlet of the inner tube by circulating a large amount of powdered solid fuel conveying gas (nitrogen, inert gas, etc.).

(2) There is a method of cooling the burner by circulating cooling water to the inside of the tip of the outer cylindrical tube of the burner (Japanese Patent Laid-Open Nos. 59-180207 and 60-36810).

The method (1) has the advantage of being able to prevent a rise in temperature near the outlet of the inner tube even if the amount of cooling water is small, and the method (2) has the advantage of simplifying the structure.

[Problem to be solved by the invention]

When gasifying powdered solid fuel, it is necessary to reduce the amount of gas that transports the powdered solid fuel to the gasifier as much as possible.

The reason for this is that inert gas (nitrogen or carbon dioxide, etc.) is generally used as the gas for transporting powdered solid fuel, and if the amount is large, it will suppress the temperature rise in the gasifier, which will affect the reaction surface. This is for the sake of influence. Therefore, the above (1)
When this method is used, there is a problem in that the temperature rise in the furnace is suppressed, the reaction rate is slowed, and the efficiency is reduced.

Furthermore, since the flow velocity within the inner tube increases, there is a problem in that wear near the outlet increases.

On the other hand, in method (2), the structure is simple, but because the cooling water does not come into contact with the outer wall near the outlet of the inner tube, the tip of the burner and the inner tube are subject to strong side radiation heat from the gasifier. The cooling capacity near the outlet of the tube decreases, and especially in internal mixing burners where the powdered solid fuel and gasifying agent come into contact with each other inside the burner and generate high heat, it is conceivable that the tube can only be cooled to a certain temperature. This has no effect on raw materials such as 1 coal, but for raw materials that burn at low temperatures such as liquefaction residue, the raw materials burn at the tip of the inner tube (inside the powder solid fuel supply tube), solidify, and It is expected that the material will accumulate, resulting in an inability to supply the raw material.

An object of the present invention is to provide a cooling type jet burner that has less wear near the burner tip and can effectively prevent a temperature rise near the burner tip.

[Means to solve the problem]

The above purpose is to overlap multiple cylindrical tubes with different diameters on the same axis, and use the innermost inner tube as a central flow path for supplying powdered solid fuel and its carrier gas, and The space between the cylindrical tubes is configured as a flow path for circulating cooling water and a flow path for supplying the gasifying agent, and the cooling water flows at high speed onto the outer wall near the tip of the innermost inner cylindrical tube and the inner wall of the burner tip. This is achieved by arranging a flow path such that the

[Effect]

Cooling water is caused to flow at high speed into the raw material jetting nozzle installed at the tip of the burner and into the flow passage provided at the outer wall at the tip of the inner tube. As a result, even if the temperature inside the furnace is as high as 1400° C. or higher, the temperature rise in the burner tip and inside the inner tube is suppressed, and any kind of powdered solid fuel can be continuously supplied.

〔Example〕

FIG. 1 is a sectional view of the tip of an embodiment of a cooled jet burner according to the present invention, and FIG. 2 is a radial sectional view of FIG. 1. In addition, Fig. 3 is a schematic configuration diagram of a gasifier to which the burner shown in Fig. 1 is applied, and Fig. 4 is a diagram showing A-A in Fig. 3.
FIG.

First, the gasifier shown in FIGS. 3 and 4 will be explained.

In FIG. 3, the gasifier 41 has a spouted bed type gasifier structure, and the inside is lined with a refractory material such as firebrick, and the slag cooling section 44. It consists of a gasification reaction section 31 and a produced gas distribution section 46.

Four burners 27 according to the present invention are installed tangentially to the lower inner wall of the gasifier reaction section 31, as shown in FIG. 4, so as to form a swirling flow within the gasifier.

Each of these burners 27 includes a cooling water inlet line 42, an outlet line 43, a gas and other agent supply line (oxygen or air) 4
0 and a coal branch pipe line 39 are connected. Inside the gasifier 41, 14. Since the temperature reaches a temperature of OO° C. or higher, the slag is configured to freely fall into a slag cooling section 44 filled with water, where it is rapidly cooled and solidified and recovered.

Next, the detailed structure of the burner 27 will be explained according to FIGS. 1 and 2.

In Fig. 1, the burner 27 is an outer tube (or cooling tube).
9. Gas and other agent supply pipes (oxygen, air and water vapor) 15.
Inner cylinder pipe (powdered solid fuel supply pipe) 16, cooling water supply pipe 1
Consists of 7. The entire burner 27 has a quadruple pipe structure, and inside the burner, cooling water 3, which passes through cooling water supply flow passages 6, 7,
4.

The powdered solid fuel 1 passes through an inner cylindrical pipe (powdered solid fuel supply pipe) 6 having a central flow path 8, and passes through the powdered solid fuel supply pipe outlet 1.
It is ejected from 4.

The gasifying agent (oxygen, air, and water vapor) 2 passes through the flow path 5 in the gas and other agent supply pipe 15, reaches a predetermined flow velocity in the flow path 10 in the raw material jetting nozzle 11, and is released from the gas and other agent jetting port 13. gush. As shown in the cross-sectional view of Fig. 2, these 13 nozzle holes are provided in 8 circumferential directions, and they have the same diameter and are located from the center with respect to the inner cylinder pipe (powdered solid fuel supply pipe) 16. The opening is tilted at an angle.

The burner 27 of this embodiment is an external mixing type burner in which the powdered solid fuel 1 and the gasifying agent (oxygen, air, and water vapor) 2 come into contact at the burner outlet. The outer cylindrical tube tip 19 has a partially tapered structure to reduce the area of the tip that receives side radiation heat from the gasifier.

The cooling water circulation system at the tip of the burner will be described in detail below.

The cooling water 3 passes through the cooling water supply passage 7 of the cooling water supply pipe 17, is supplied to the raw material jetting nozzle 11 at the tip of the burner, passes through the outer wall cooling water passage 12 near the outlet of the inner cylinder pipe, and passes through the outlet of the inner cylinder pipe. After cooling the nearby outer wall, the water flows through the coolant return flow path 6 in the outer tube 9 via the burner tip inner wall and the tapered inner wall cooling water flow path 18, and then flows from the burner cooling water line to the existing equipment cooling water return line. will be returned to.

FIG. 5 is a sectional view of the tip of the second embodiment of the burner 27, and FIG. 6 is a radial sectional view of FIG. 5. 7 is a cross-sectional view of the tip of the burner 27 according to a third embodiment, FIG. 8 is a radial cross-sectional view of FIG. 7, and FIG. FIG. 10 is a radial cross-sectional view of FIG. By installing the flow passage 5 on the outside of the cooling water supply pipe 17, an attempt is made to suppress the rise in temperature inside the vicinity of the tip of the inner cylinder pipe, and it has the same effect as the embodiment shown in Fig. 1. It is.

Figure 11 is a graph showing the influence of the cooling water flow rate on the internal temperature of the burner tip.
The temperature inside the tip gradually decreases up to 0 m/s, but does not change much after that. From this,
It can be seen that temperature rise can be effectively suppressed by setting the flow velocity in the inner wall flow passage at the burner tip to 10 m/s or more.

〔Effect of the invention〕

As explained above, according to the present invention, it becomes possible to reduce wear near the burner tip and effectively suppress the temperature rise near the burner tip and the inner tube outlet, and as a result, It has the effect of continuously supplying any kind of powdered solid fuel.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the tip of a first embodiment of a cooling type jet burner according to the present invention, FIG. 2 is a radial sectional view of FIG. 1,
FIG. 3 is a schematic configuration diagram of a gasifier to which the burner of the present invention is applied, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG. 5 is a second embodiment of the cooling type jet burner according to the present invention. FIG. 6 is a radial cross-sectional view of FIG. 5, FIG. 7 is a cross-sectional view of the tip showing the third embodiment of the cooling type jet burner according to the present invention, and FIG. 7 is a radial sectional view, FIG. 9 is a sectional view of the tip of the fourth embodiment of the cooling type jet burner according to the present invention, FIG. 10 is a radial sectional view of FIG. 9, and FIG. 11 is a radial sectional view of FIG. 12 is a graph showing the relationship between cooling water flow rate and burner tip cooling water temperature, and FIG. 12 is a schematic configuration diagram of the spouted bed gasifier. 1...Powdered solid fuel, 2...Gasifying agent, 3...Cooling water (supply), 4...Cooling water (return), 5...Gasifying agent, 6...Cooling water Return flow path, 7... Cooling water supply flow path, 8... Center flow path, 9... Outer cylinder pipe, 1o...
- Raw material spouting nozzle internal flow passage, 11... Raw material spouting nozzle, 12... Inner cylindrical pipe, 13... Gas and other agent spouting port, 14
... Powdered solid fuel spout, 15... Gas and other agent supply pipe,
16...Inner tube. 17... Cooling water supply pipe, 18... Tapered inner wall cooling water flow passage, 19... Burner tip, 22... Pressurizing hopper, 23... Supply hopper, 24... Carrier gas, 25
...Raw material transport line, 26...Distributor, 27...
Raw material injection burner, 28...Gas and other agent control valve, 29...
・Steam control valve, 30... Entrained bed gasifier, 31...
Gasifier reaction section, 32...Slag hopper, 33...
Gasifier outlet line, 34... Dust collection system, 35... Desulfurization system, 36... Inner, 37... Slag line, 3
8... Upper branch pipe line, 39... Lower branch pipe line, 40... Lower gas/other agent line, 41... Upper gas/other agent line, 42... Cooling water inlet line, 43...
・Cooling water outlet line, 44...Water filling layer, 45...
Feeder, 46...Gas generation/distribution section, 47...Material conveyance line, 48...Normal pressure hopper, 49 Liang concavity rate 2 section 6th day 1 cass hole porridge i'1 Fig.8 Figure 9 Figure 10 Concave/C, fP Wood Cage Seven Se-(Tl/s)

Claims (1)

[Claims] 1. A plurality of cylindrical tubes with different diameters are superimposed on the same axis, and the innermost inner cylindrical tube is a central flow path for supplying powdered solid fuel and its carrier gas, and the outer cylindrical tube is The space between the inner cylinder and the cylindrical tubes is configured as a flow path for circulating cooling water and a flow path for supplying the gasifying agent, respectively. A cooling type jet burner characterized by having a flow path that allows cooling water to come into contact with it at high speed. 2. The cooling type jet burner according to claim 1, wherein the flow velocity of the cooling water flowing through the outer wall near the tip of the inner tube and the inner wall of the burner tip is 10 m/s or more. 3. The cooling type jet burner according to claim 1, wherein the outermost cylindrical tube has a partially tapered tip. 4. The cooling type jet burner according to any one of claims 1 to 3, wherein the powdered solid fuel and the gasifying agent come into contact after the outlet of the burner tip.