JPH0355413A - Feed dispersion nozzle for high moisture residue to fluidized bed combustion device - Google Patents

Abstract

PURPOSE:To perform the excellent feed and dispersion of a high moisture residue and to improve combustion efficiency by a method wherein a high moisture residue feed passage is formed in the central part of a nozzle body, a pressure fluid feed part is provided therearound, and a pressure fluid dispersion plate having a number of pressure fluid injection nozzles is arranged in a position facing a mixing chamber for a residue and pressure fluid. CONSTITUTION:A high moisture residue is fed with a pressure through an inlet 2a of a feed dispersion nozzle 1 to a residue feed passage 2 and fed to a mixing chamber 8 in front. Meanwhile, compressed air is fed through the feed dispersion nozzle 1 to a compressed air passage 3, and fed in the mixing chamber 8 through each of a number of compressed air injection nozzles 7 of an air dispersion plate 6. Since the air injection nozzles 7 are respectively pointed in the direction of an outlet nozzle 9 of the mixing chamber 8 and inclined at a specified angle with a plane A containing an axis, compressed air produces a swirl flow and injected. Thus, a high moisture residue fed to the central part of the interior of the mixing chamber 8 is revolved by means of injected compressed air and fed to the outlet nozzle 9 as it is agitated. The compressed air is dispersed and fed in a swirl state approximately throughout the whole of the upper surface of the primary fluidized bed of a combustion chamber.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention applies to a fluidized bed combustion apparatus for high water content residue such as beer grounds, coffee grounds, mandarin orange grounds, or sludge containing a large amount of water. The present invention relates to a supply dispersion nozzle.

[Conventional technology]

Conventionally, rotary valves,
A screw feeder, a pressure pump such as a screw pump (monobomb), a spreader, or a combination of these are used. [Problems to be Solved by the Invention] In order to carry out fluidized bed combustion, it is necessary to increase the combustion efficiency by distributing and supplying fuel almost evenly over the entire surface of a fluidized bed having a certain wide planar area.

However, for example, high water content residue such as beer lees contains a large amount of water, for example 70 to 80%, and
Because it has a moderate viscosity, high ice-containing residue tends to drip down and be supplied to the fluidized bed in conventionally used pressure bombs such as rotary valves, screw feeders, and screw bombs as described above. Therefore, it is difficult to widely disperse and supply the entire surface of the fluidized bed.

In addition, since the above-mentioned spreader uses its rotating blades to blow away high-water content residue, the scattering condition is better than that of pressure bombs such as the above-mentioned rotary valve, screw feeder, screw bomb, etc.; does not spread as expected, making it difficult to achieve stable dispersion on the surface of the fluidized bed. Also, even with this, high water content residue tends to drip down from the outlet and accumulate in the vicinity of the outlet. In order to spread highly water-containing residue over as wide a range as possible, it is necessary to increase the rotation speed and expose it to a high temperature atmosphere (e.g. 750°C to 800"C), so the blades, shaft, etc. , bearings and other rotating parts suffer from severe wear and tear, resulting in poor durability and low operational reliability.

Therefore, the above-described supply apparatus has a problem in that the combustion efficiency in the fluidized bed is not good.

The present invention has been made in view of these problems, and provides a highly water-containing product that can improve the combustion efficiency by dispersing the supply of high-water content residue, has a simple structure, and can operate reliably. The object of the present invention is to provide a dispersion nozzle for supplying residue to a fluidized bed combustion apparatus.

[Means to solve the problem]

In order to achieve the above object, the present invention provides (1) a highly water-containing residue supply passage in the center of the nozzle body, a pressurized fluid supply section around this passage, and a high water content residue supply passage in the center of the nozzle body; A mixing chamber for a pressurized fluid and a residue snout whose axes are aligned and communicated with the material supply passage is provided, an outlet nozzle is provided at the tip of this mixing chamber, and an outlet nozzle is provided at a position facing the mixing chamber of the pressurized fluid supply section. A pressurized fluid dispersion plate having a large number of pressurized fluid ejection ports spaced apart in the circumferential direction is provided, and each of the pressurized fluid ejection ports is directed toward the exit nozzle of the mixing chamber, and with respect to a plane containing the axis. It was constructed so that it was tilted at a certain angle. (2) In the structure described in (1) above, the outlet nozzle of the mixing chamber is detachably attached to the mixing chamber. (3) In the configuration of (2) above, the outlet nozzle of the mixing chamber is detachably attached to the mixing chamber in a state where the axial distance can be adjusted.

(Function) In the configuration (1) above, the high water content residue supplied to the center of the mixing chamber from the high water content residue supply passage in the center of the nozzle body is transferred from the periphery to the pressurized fluid distribution plate. A pressurized fluid such as compressed air or saturated steam is ejected as a swirling flow from each of a large number of pressurized fluid ejection ports in the circumferential direction, and the fluid is sent toward the outlet nozzle while being swirled and stirred. Therefore, even if the residue contains a large amount of water and is viscous, it is efficiently dispersed from the outlet nozzle and supplied to the fluidized bed.In addition, it is discharged from the pressurized fluid supply section. By adjusting the amount of pressurized fluid supplied, the scattering shape B (splatter distance, width, etc.) can be easily adjusted.

Therefore, efficient fluidized bed combustion is performed.

Note that, as the pressurized fluid, for example, compressed air with an original pressure of 7 kg/dG or saturated steam with an original pressure of 10 kg/cdG, for example, is used.

Assuming the horizontal precept in (2) above, the nozzle diameter of the outlet nozzle,
It is possible to exchange outlet nozzles with different dimensions such as length in the axial direction, and an outlet nozzle suitable for the properties of the highly water-containing residue is selected to perform efficient fluidized bed combustion.

With the configuration (3) above, the degree of freedom in adjusting the scattering state is further provided, and more efficient fluidized bed combustion can be performed.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
The figure is a longitudinal cross-sectional view showing a supply and dispersion nozzle for a highly water-containing residue, and FIG. 2 is a cross-sectional view (front view) taken along the line ■ to ■ in FIG. 1.

In addition, in the following examples, a case will be explained in which compressed air is used as the pressurized fluid.

In FIGS. 1 and 2, a high water content residue supply/dispersion nozzle main body 1 includes an inner cylinder 4 forming a residue supply passage 2 in the center, and a structure surrounding the inner cylinder 4 on the outer periphery of the inner cylinder 4. The outer cylinder 5 is attached, and the space between the outer cylinder 5 and the inner cylinder 4 is configured with a compressed air supply passage 3 serving as a pressurized fluid supply section, that is, a compressed air supply section. There is. 5a is a compressed air inlet attached to the end of the outer cylinder 5 opposite to the mixing chamber 8. 2a is an inlet for the highly water-containing residue formed at the end of the inner cylinder 4. A mixing chamber 8 is located at the end of the supply dispersion nozzle main body 1 on the opposite side to the population 2a, with the axis line of the inner cylinder 4 being broken and communicating with the inner cylinder 4. At a position facing the mixing chamber 1, at the end of the compressed air supply passage 3, a truncated conical air distribution Fi. (Pressurized fluid distribution plate) 6 is attached.

The air distribution plate 6 has compressed air outlets (
A large number (12 in this embodiment) of pressurized fluid ejection ports 7 are provided. Each compressed air outlet 7 is oriented in the direction of an outlet nozzle 9 (to be described later) as shown in FIG. The holes are inclined in a fixed direction with respect to a plane A including the axis. The mixing chamber 8 extends from the outer cylinder 5 and is narrowed into a conical shape in the direction of its distal end, and the most distal end 8a is shaped like a straight pipe, and an outlet nozzle 9 is provided in the straight pipe part of the most distal end 8a. are screwed together and are removably provided. 9a is a nozzle hole (minimum diameter outlet part). A female thread 8b is screwed onto the inner surface of the straight pipe portion of the most extreme portion 8a,
A male thread 9b is threaded onto the outer peripheral surface of the outlet nozzle 9. A tapered surface 9C having the same slope as the tapered inner surface 8c of the mixing chamber 8 is formed on the inner surface of the outlet nozzle 9 on the mixing chamber 8 side. Moreover, a taper 9d is formed on the outside of the nozzle nozzle 9a of the outlet nozzle 9, the diameter of which increases toward the end. An annular ring spacer l2 is interposed between the end of the straight pipe part of the leading end 8a of the mixing chamber 8 and the stepped part 9e of the outlet nozzle 9, and by replacing it with a spacer 12 of a different thickness, the outlet The axial position of the nozzle 9 can be adjusted with respect to the mixing chamber 8. In FIG. 1, reference numeral 10 is a mounting seat of the supply distribution nozzle body 1 attached to the primary combustion chamber 22, and the supply distribution nozzle body 1 has a flange 5b fixed to its outer cylinder 5 and a flange ll of this mounting seat 10.
It is attached to the primary combustion chamber 22 by being joined with a. In addition, although the offering nozzle main body 1 is shown in a horizontal state in FIG. 1, it is actually shown in FIG. 3 or 4.
As shown in the figure, it is attached at an angle with respect to the primary combustion chamber 22.

Figure 3 is a diagram showing the system for supplying high water content residue to the high water content residue supply dispersion nozzle l configured in this manner together with the fluidized bed combustion apparatus 20, and Figure 4 shows an enlarged view of the main parts. 5 is a partial side view taken along the line V-V in FIG. 4.

In both figures, a fluidized bed combustion apparatus 20 includes an air chamber 2l having an auxiliary combustion parlor 21a using heavy oil as fuel at the bottom stage, and a primary combustion chamber 22 partitioned by a gas distribution plate 24 above the air chamber 2l.
, the upper part of the primary combustion chamber 22 is provided with a secondary combustion chamber 23 divided by a gas distribution plate 25, and the upper part of the secondary combustion chamber 23 is provided with an exhaust gas outlet 26, which is connected to the secondary combustion chamber 23. A waste heat boiler 27 is provided in the middle of the exhaust gas discharge duct 28. 22a is a primary fluidized bed in which a fluidized medium such as sand is fluidized by high-temperature air distributed and supplied from the air chamber 21 by a gas distribution plate 24, and 23a is a combustion bed discharged from the primary fluidized bed 22a. This is a secondary fluidized bed in which exhaust gas is distributed and supplied by a gas distribution plate 25 and a similar fluidized medium such as sand is fluidized. The supply and dispersion nozzle 1 of high water content residue is connected to the primary combustion chamber 22.
on the side wall of the primary fluidized bed 22a at a position above the upper surface of the primary fluidized bed 22a,
It is attached with the exit nozzle 9 side at the tip facing slightly downward. In this embodiment, the supply dispersion nozzles 1 are provided at three locations on the side wall of the primary combustion chamber 22, as shown in FIG.

22b is an auxiliary burner using heavy extraction as fuel, and the flame is ejected at a position above the upper surface of the primary fluidized bed 22a, and between the distributed supply nozzles l as shown in FIG. It is provided on the side wall of the primary combustion chamber 22 at a position close to the distributed supply nozzle 1 .

30 is a high water content residue hopper, 30a to 30c are hopper discharge ports (three locations in this embodiment), 31 is an arch play force provided in the hopper discharge port, and 32 is a pie breaker provided at each of the hopper discharge ports 30a to 30c. A screw bomb 41 is attached to the lower end of the arch breaker 31 to cut out the high water content residue from the hopper 30 and forcefully feed it to the supply distribution nozzle 1, and a pipe 42 is connected to the screw bomb 41. The end of the pipe 42 is flanged to the end inlet 2a of the residue supply passage 2 of the supply distribution nozzle l. A shutoff valve 4 is installed in the middle of the pipe 42.
3 is interposed. These screw bomb 41, piping 42, and cutoff valve 43 constitute a residue supply device 140.

On the other hand, a compressed air supply device 50 is connected to the supply distribution nozzle 1, and the compressed air supply device 50 is connected to a pipe 52 and a pipe 52 connecting the compressed air supply source 5l and the compressed air population 5a of the supply distribution nozzle 1. It is composed of an interposed shutoff valve 53 and an air amount adjustment valve 54.

A residue supply device 40 and a compressed air supply device 50 are connected to each of the three supply dispersion nozzles 1 shown in FIG.
is connected.

FIG. 6 is a longitudinal sectional view showing details of the screw bomb 41. In the figure, 60 is a screw feeder portion which is discharged from the discharge ports 30a to 30c of the high water content residue hopper 30 and cuts out the high water content residue through the input port 62, and 64 is a screw shaft. 6l is a bomb section for pressure-feeding the residue supplied from the screw feeder section 60 to the supply distribution nozzle 1 through the piping 42;
65 is a rotor whose outer circumferential surface meshes with a stator 66 whose inner circumferential surface has a wave-shaped cross section and rotates eccentrically. 63 is an input shaft connected to a rotational drive source such as an electric motor;
8 is a shaft coupling that connects the input shaft 63 and the screw shaft 64;
69 is a shaft coupling that connects the screw shaft 64 and the rotor 65. 67 is a wandering outlet, to which piping 42 is connected. In such a configuration, high water content residue such as beer lees containing high water content (70 to 80%) is cut out from the high water content residue hopper 30 by the screw bomb 4l and at a predetermined pressure (for example, a maximum of 7 kg/kg). cTaG) is fed under pressure into the pipe 42, and is supplied through the supply dispersion nozzle 1-. This residue is passed through the supply dispersion nozzle 1 to the inlet 2 in Figure 1.
From a, the residue is supplied under pressure into the residue supply passage 2 and sent to the mixing chamber 8 in the front. On the other hand, the supply distribution nozzle 1 is supplied with compressed air with a source pressure of 7 kg/caG, for example, into the compressed air passage 3 by the compressed air supply device 1f50, and the air distribution plate 6
The compressed air is supplied into the mixing chamber 8 from each of the large number of compressed air outlets 7 . Each of the air jet ports 7 is directed toward the outlet nozzle 9 of the mixing chamber 8, and is provided obliquely at a certain angle j with respect to the plane A including the axis.
As shown in the figure and Figure 2, compressed air is ejected as a swirling flow (spiral flow). Therefore, in the mixing chamber 8, the highly water-containing residue supplied to the center of the mixing chamber 8 as described above is swirled by the compressed air jetted out from around it in the swirling flow. The nozzle 9 of the outlet nozzle 9 is sent in the direction of the outlet nozzle 9 while being stirred by the
It is discharged from a. Therefore, even if the residue contains a large amount of water and is viscous, it will not drip down from the tip of the exit nozzle 9, and will be ejected over a wide and long distance and efficiently dispersed. As shown by the two-dot chain line 11 in FIGS. 1 and 3, the supply is distributed over almost the entire upper surface of the primary fluidized bed 22a of the primary combustion chamber 22 in a parabolic trajectory, as shown in FIG. As described above, by providing the supply distribution nozzle 1 at a plurality of locations (three locations) in the width direction, even a fluidized bed having a wide width can be uniformly distributed and supplied in the width direction.

Furthermore, by adjusting the amount of compressed air supplied to the compressed air supply passage 3 using the flow rate adjustment valve 54 of the compressed air supply device 50, the scattering conditions such as the scattering distance and width can be easily adjusted.

In this way, the highly water-containing residue is widely and uniformly distributed and supplied to the primary fluidized bed 22a, so that the combustion efficiency in the primary fluidized bed 22a is greatly improved.

In the fluidized bed combustion apparatus 20, for example, 80
High-temperature air of 0 to 900°C is introduced into the primary combustion chamber 22 via the gas dispersion Fi 24 to fluidize the fluidized medium to form a primary fluidized bed 22a.
The highly water-containing residue, which is beer lees containing, for example, 80% moisture, is uniformly injected onto the fluidized bed surface as described above by the supply dispersion nozzle 1 from the upper part of a, at a temperature of, for example, 750.
In the primary fluidized bed 22a kept at a temperature of .degree. C., the water is instantly evaporated by contacting the sand heated to a high temperature forming the fluidized bed. The dehydrated residue is easily combusted while being stirred by sand in the fluidized bed. An example of analysis of beer lees as this residue shows that the increase in higher heat generation was 4850Kca.
The elemental content is 48.86% carbon, 6.9% hydrogen, 37.14% oxygen, 3.23% nitrogen, 3.28% ash, and 0.58% other. In this primary fluidized bed 22a, about 70% of the residue is burned, and the remaining about 30%
The unburned content (unburnt carbon) of
Ash) is introduced into the secondary combustion chamber 23 through the upper gas distribution plate 25 through the freeboard, and a secondary fluidized bed 23a is formed in the secondary combustion chamber 23. In this secondary fluidized bed 23a, about 30% of the unburned matter is combusted and completely combusted. In this embodiment, the fluidized bed combustion apparatus 20 is configured with a two-stage fluidized bed, and the second stage fluidized bed (secondary fluidized bed 2
In step 3a), unburned carbon is caught and completely combusted, resulting in good combustion efficiency and a high blast hearth load.
In the case of this example, . Hearth load is 400-450kg/m
・It is hr. Furthermore, compared to an incinerator consisting of only one stage of fluidized bed, the cylinder speed can be higher, the area of the fluidized bed is reduced, the size of the furnace is small, and the incinerator is compactly constructed.

80 from the secondary combustion chamber 23 through the exhaust gas outlet 26
Combustion exhaust gas at a temperature of 0 to 900°C is introduced into a waste heat boiler 27 provided in the middle of the exhaust gas duct 28, where a predetermined amount of heat is recovered to obtain steam. Note that the air chamber 2
1, air preheated to a high temperature in an air preheater (not shown) by the exhaust gas after passing through the waste heat boiler 27 is introduced, and is used as fluidization and combustion air.

The auxiliary combustion burner 21a provided in the air chamber 2l operates so that the temperature of the primary fluidized bed 22a remains constant even when the moisture content of the residue changes (for example, when the moisture content increases and the temperature of the fluidized bed decreases). Further, the auxiliary burner 22b provided in the primary combustion chamber 22 is operated together with the auxiliary burner when the moisture content of the residue increases extremely. By operating this auxiliary burner 22b, it becomes possible to evaporate a predetermined amount of moisture in the freeboard between the highly water-containing residue discharged from the supply dispersion nozzle l and reaching the surface of the primary fluidized bed 22a. The residue can be burned more efficiently in the fluidized bed 22a.

On the other hand, in FIG. 1, since the outlet nozzle 9 is detachably attached to the tip 8a of the mixing chamber 8, the diameter of the nozzle 9a of the outlet nozzle 9 and the length of the outlet nozzle 9 in the axial direction It is possible to replace the outlet nozzle with a different size such as , etc., and it is possible to select the outlet nozzle that is suitable for the properties such as moisture content, particle size, viscosity, etc. of the high water content residue, resulting in more efficient fluidized bed combustion. be able to.

In addition, by replacing the spacers l2 with various thicknesses, the axial distance of the mixing chamber 8 can be adjusted, so that the degree of freedom in adjusting the scattering state of the highly water-containing residue can be further increased. More efficient fluidized bed combustion can be performed.

FIG. 7 is a vertical cross-sectional view of a main part of another embodiment of the supply/dispersion nozzle corresponding to FIG. 1.

In this figure, the supply dispersion nozzle main body 70 differs from the supply dispersion nozzle main body 1 shown in FIG. 1 only in the mixing chamber. That is, the mixing chamber 75 is constituted by the outlet nozzle 71 and the spacer 73. The outlet nozzle 71 has a nozzle nozzle 71a1 at the tip and a flange 72 at the opposite end.
have. Further, a flange 74 that is joined to the flange 72 of the outlet nozzle 7l is attached to the end of the outer cylinder 5 on the residue supply passage 2 side, and both flanges 7
2 and 74 in the axial direction, and bolts and nuts are tightened into the bolt holes 72a and 74a of both flanges 72 and 74 to form the mixing chamber 75 as one unit. Note that both ends of the spacer 73 in the axial direction are provided with flanges 72,
74 and abut against the end surface of the outer cylinder 5 and the end surface of the outlet nozzle 71, respectively. Furthermore, Figure 7 shows the state when disassembled. By configuring the supply dispersion nozzle 70 in this way, it is possible to replace the outlet nozzle 7l with one having a different diameter D and axial length L of the nozzle opening 71a, and the axial length of the spacer 73 can be changed. The width (width) W can be exchanged with a variety of different widths, and as in the case shown in FIG. 1, optimum supply and distribution can be performed depending on the properties of the highly water-containing residue.

In addition, as shown in FIG. 3 or FIG. 4, in the middle of the compressed air supply pipe 52 to the compressed air supply passage 3 of the supply distribution nozzle l, there is a supply pipe for supplying saturated steam with a source pressure of 10 kg/cfflG, for example. 55 is connected, and the compressed air supply pipe 52 and the steam supply pipe 55 are provided with on-off valves 5'2a and 55a, respectively, near this connection point, so that when the fluidized bed combustion apparatus 20 is stopped, After stopping the supply of the residue by closing the cutoff valve 43 of the residue supply device 40, compressed air is supplied for the required time to exhaust as much of the residue remaining in the mixing chamber 8 as possible, and then the compressed air is The on-off valve 52a is closed and the steam on-off valve 55a is opened to supply steam.The compressed air is introduced into the mixing chamber 8 from the compressed air outlet 7 through the compressed air supply passage 3 of the dispersion nozzle 1, and is supplied from the nozzle hole 9a of the outlet nozzle 9. It is possible to completely blow out high water content residues that remain or adhere to the Y-consolidating chamber 8 and the outlet nozzle 9 with steam, thereby keeping the mixing chamber 8 and the outlet nozzle 9 clean. This prevents blockages caused by burning due to residual high water content. In addition, along with the cleaning action of such steam, the cleaning action of a large number of compressed air jets is also performed. Further, the cleaning action of the mixing chamber 8 and the outlet nozzle 9 using steam can also be performed when the operation is restarted (startup).

By carrying out the above operations, it is possible to improve the dispersion state of the residue by the supply dispersion nozzle 1 at the time of startup. Furthermore, if steam is occasionally supplied to the compressed air during operation and is fed into the mixing chamber 8 together with the compressed air, the mixing chamber 8 and the outlet nozzle 9 can be cleaned during operation. This can prevent blockages during operation. On the other hand, in the above embodiment, compressed air was used as the pressurized fluid for the supply and dispersion nozzles 1 and 70, but for example, saturated steam having a pressure of 10 kg/cdG at the original pressure may also be used. In this case as well, the supply and dispersion effect of the residue can be performed efficiently, and the cleaning of the mixing chamber 8 and the outlet nozzle 9 with steam as described above can be performed using the same steam and in parallel with the operation. .

Next, the results of an experiment conducted using the supply dispersion nozzle 70 of the present invention to confirm the state of supply and dispersion of highly water-containing residue will be explained.

A dispersion test 1 of the dispersion supply nozzle 70 according to the present invention was conducted using the apparatus shown in FIG. In FIG. 8, the residue inlet 2a of the supply dispersion nozzle 70 and the screw pump attached to the lower part of the residue hopper are connected with a hose with a diameter of 2 inches, and the compressed air port 5a is supplied with an original pressure of 7 kg/cIaG.
A source of compressed air is connected via a gas pipe, and an orifice and a flow rate adjustment valve are installed in the middle of the air pipe to adjust the amount and pressure of compressed air supplied to the supply distribution nozzle 70.
On the other hand, the device shown in Figure 9 was used as a test device to check the dispersion status using a conventional spreader. A hose was used to connect the receiving waste of the spreader to a screw pump attached to the bottom of the residue hopper.

Using the above test equipment, we conducted a dispersion test on beer grounds as a highly water-containing residue. Below, the test results (example) using the supply dispersion nozzle 70 according to the present invention conducted based on the device shown in FIG. 8, and the test results (comparative example) using the conventional device spreader conducted using the device shown in FIG. 9 will be shown. .

In addition, in FIGS. 8 and 9, the distributed supply nozzle 70 or the spreader is installed at a height position where the distance (height) H from the ground to its center is 800 mm, and the distributed supply nozzle 70 or the spreader is placed on the ground in front of it. The supply was dispersed, and the state (shape) of the material deposited on the ground (described as scattered objects in the figure) was measured. DT is the scattering distance, Wl is the scattering width,
K is the distance from the tip of the nozzle 70 to the starting point of the flying debris. Figure 10 shows the state of accumulation of scattered debris seen from above (No. 8,
This is a plan view (viewed from arrow A in Figure 9). In addition, in the following, the accumulation state of scattered objects (dispersed distance DT, yf4 width of loss W■) is 5.
Shows the status after running for a minute. Beer lees has a moisture content of 80%
%, and the results are shown below.

〔Example〕

Table 1 [Comparative Example] Table 2 In a test using a spreader for this comparative example, as the amount of beer lees supplied increased, the amount of beer dregs tended to accumulate more toward the scattering origin. It also had a strong tendency to drip in front of the spreader.

Comparing the test results in Table 1 (Example) and Table 2 (Comparative Example) above, it is found that the supply dispersion by the supply dispersion nozzle according to the present invention has a scattering distance DT and a scattering width Wl that are different from those conventionally used. This value is considerably larger than the supply dispersion by the spreader, which shows that the supply dispersion effect of the supply dispersion nozzle according to the present invention is excellent.

In addition, in Table 2, as the number of rotations of the spreader increases, as in the case of Numbers 1 to 3, the scattering distance becomes larger, and is greater than the scattering distance in the case of the supply dispersion nozzle in Table 1. Although it may be larger (for example, the spreader rotation speed 600 rpm + m in number 3 in Table 2)
(splash distance: 4.0 m), this spreader has a rotating part, and when installed in an actual fluidized bed combustion equipment, it will be exposed to the high temperature atmosphere of the combustion chamber, so it must be rotated at high speed to continue operation. In the case of a combustion device that is subject to high-speed combustion, its durability is extremely poor, especially in the rotating parts. In addition, in the case of the spreader, the scattering width Wl is significantly smaller than that in the case of the supply dispersion nozzle of the present invention, and this does not change much even if the number of revolutions of the spreader is increased.

In this regard, in the case of the supply dispersion nozzle of the present invention, as in the cases 1 to 4 in Table 1, the supply amount of beer grains is the same and the solid-air ratio is the same under the same conditions. As the amount of air is increased (the amount of air is decreased), both the scattering distance DT and the scattering width Wl become smaller, indicating that the scattering condition can be easily adjusted by simply adjusting the amount of compressed air. .

Also, from Table 1, in the supply dispersion nozzle of the present invention, for example, when comparing the cases of 2 and 5 times, when the spacer width W is made considerably large, both the scattering distance IDT and the scattering width WI become large. When the axial distance of the supply nozzle is increased, the scattering distance jd! It can be seen that DT and the scattering width Wl can be increased. In addition, when comparing the number of times 2 and 6, when the spacing width W hardly changes, there is no influence on the scattering distance DT and the scattering width Wl. Furthermore, when comparing the number of times 2 and 7, it is found that if the axial distance of the nozzle is not changed but the aperture D is increased (in this case, twice the size), the scattering distance is increased! DT
, and the scattering width Wl are both small, indicating that adjustment by changing the nozzle diameter is also possible.

(Effect of the invention) As detailed above, in the present invention, water is contained in a large amount,
In addition, the viscous high water content residue can be widely and uniformly and reliably supplied and dispersed to the surface of the fluidized bed, and the combustion efficiency in the fluidized bed can be significantly improved. In this case, the dispersed supply nozzle has no rotating parts and has a simple structure, so it is durable even when exposed to the high temperature atmosphere of the combustion chamber, so reliable distributed supply can be performed. ．． By simply adjusting the supply amount of pressurized fluid such as compressed air or steam to the pressurized fluid supply section, the scattering state (
The scattering distance and width can be easily adjusted. Furthermore, if the outlet nozzle is configured to be detachably attached to the mixing chamber, it is possible to replace the outlet nozzle with one having different dimensions such as the nozzle diameter of the outlet nozzle or the length in the axial direction of the outlet nozzle. It is possible to select an outlet nozzle suitable for the properties of the highly water-containing residue, such as water content, particle size, viscosity, etc., and more efficient fluidized bed combustion can be achieved.

Furthermore, if the outlet nozzle is detachably attached to the mixing chamber with its axial distance adjustable, the axial distance of the mixing chamber can be adjusted.
It is possible to have a degree of freedom in adjusting the scattering state of the highly water-containing residue, and more efficient fluidized bed combustion can be performed.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing the supply and dispersion nozzle for high water content residue, Fig. 2 is a cross sectional view (front view) taken along the line u to ■ in Fig. 1, and Fig. 3 is a supply and dispersion nozzle for high water content residue. A diagram showing the supply system of highly water-containing residue to the nozzle 1, etc. together with the fluidized bed combustion equipment, Figure 4 is an enlarged installation view of the main parts of Figure 3, and Figure 5 is the V- in Figure 4.
FIG. 6 is a longitudinal sectional view of the screw bomb; FIG. 7 is a longitudinal sectional view (exploded view) of main parts showing another embodiment of the supply dispersion nozzle corresponding to FIG. 1; Fig. 8 is a system diagram showing a test device for dispersing and supplying highly water-containing residue using the supply dispersion nozzle of the present invention, and Fig. 9 is a test device for dispersing and supplying highly water-containing residue using a spreader, which is a conventional supply device. Fig. 10 is a plan view taken along the line A in Figs. DESCRIPTION OF SYMBOLS 1, 70... Supply distribution nozzle body, 2... Residue supply passage, 3... Compressed air supply passage, 8, 75... Mixing chamber, 6... Air distribution plate, 7... compressed air outlet,
9, 71... Outlet nozzle, A... Plane containing the axis (
(Fig. 2), 20...Fluidized bed combustion device, 22...Primary combustion chamber, 23...Secondary combustion chamber, 30...Residue snout hopper 40...Residue supply device, 4l... Screw pump, 50... Compressed air supply device.

Claims (3)

[Claims] (1) A high water content residue supply/dispersion nozzle installed in the combustion chamber of a fluidized bed combustion apparatus for fluidized combustion of high water content residue, the supply/dispersion nozzle supplying high water content residue to the center of the nozzle body. A passage is provided, a pressurized fluid supply section is provided around the passage, and a mixing chamber for residue and pressurized fluid is provided at the tip of the nozzle body, the axis of which is aligned with and communicates with the residue supply passage; An outlet nozzle is provided at the tip of the pressurized fluid supply section, and a pressurized fluid distribution plate having a large number of pressurized fluid ejection ports spaced apart in the circumferential direction is provided at a position facing the mixing chamber of the pressurized fluid supply section, and each A method for discharging highly water-containing residue into a fluidized bed combustion apparatus, characterized in that the pressurized fluid jet port is directed toward the exit nozzle of the mixing chamber and is inclined at a certain angle with respect to a plane including the axis. Feed distribution nozzle. (2) The nozzle for supplying and dispersing highly water-containing residue to a fluidized bed combustion apparatus according to claim (1), wherein the outlet nozzle of the mixing chamber is detachably attached to the mixing chamber. (3) Highly water-containing residue to a fluidized bed combustion apparatus according to claim (2), characterized in that the outlet nozzle of the mixing chamber is detachably attached to the mixing chamber in such a manner that the axial distance can be adjusted. feeding dispersion nozzle.