JPS58156179A - Rotary fluid type drier incorporating heat transfer pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a louver for feeding hot gas from below into a cylindrical rotating body, and allows the hot gas to pass through the wet material supplied into the rotating body. The present invention relates to a rotary flow type dryer having a built-in heat exchanger tube in a rotary rIIthB type drying shaft that dries the wet material while fluidizing it.

Conventionally, a cylindrical single-turn tltj to dry &lil material
I found the following unpleasant thing about the I&ll type dryer.

(1) Provided on the inner surface of the cylinder! A single-barrel drying shaft that cures the material using a lh plate or partition plate and dries it by bringing it into direct contact with the h wind.

(2) Karasuia! As shown in 2, a Ml heat transfer tube for steam etc. is laid inside the rotary unit (1), installed at one end and guided to dry material from the product outlet (4) provided at the other end. A rotary dryer with a bm heat exchanger tube, which is discharged by
Moon, the inlet of 1 air introduced into the heat transfer tube Q), (6
) is the air inlet, (υ is the air outlet, and when the wet material is heated in the rotary body (1), the internal humidity increases, so the rotary body (1) is connected to the rotating body in order to exclusively distribute air and dry the wet material more efficiently. (1) are provided at both ends.

(3) As shown in Figure 8-), a louver is provided inside the -transformed body φ), and the inward direction of the -transformed body (2) and the skeleton louver (9) are provided.
) Introduce hot gas (B) from one end of the air inlet ring into the hollow chamber formed by The ventilated dryer (b) in the figure is an outlet hood, which discharges the dry material from the lower end and exhausts the waste gas (2) in the rotary fuselage from the upper end.

However, these rotary dryers simply dry wet materials, so when fine-grained wet materials are dried, the fine powder contained therein becomes particulate dust, and the dry materials and this The particulate-generating dust often becomes particles that are introduced into subsequent equipment, causing handling problems. Incidentally, in recent years, there has been a call for the use of coal as a substitute for petroleum, and in particular, a large amount of coal has been used for steelmaking, and coking coal for coking is also used in the steelmaking process. In such a case, for coke, 1 coking coal, i.e. spinning material (in the case of a dry coal charging method in which a rotary dryer is used to make dry material and this dry material is supplied to a coke oven, combustion in a coke oven) It has been considered to introduce exhaust gas into the rotary am and utilize it effectively to save energy.

However, as mentioned above, conventional rotary dryers simply dry, so as the coking coal for coking in the rotary dryer becomes drier, the amount of dust increases, making it difficult to produce in the coke oven. This has caused problems such as carrying over, increasing the collection load, and increasing the load on the tar treatment process. Therefore, it has not been possible to dry coking coal to a constant moisture content (l-2%) in a rotary dryer while suppressing the generation of dust. Figure 6 shows the moisture content (dryness) in coking coal for coking and the moisture content based on it.
The target line for dust generation is approximately If, but if the dust generation of coking coal for coking is to be within the target line, it is approximately 4. It is clear that if the water content is not greater than 1%, the droplet will be very high, about li+)-Zoo, which will cause problems as described above. Generally, drying to a moisture content of about 5% is said to be a practical moisture content.

The present invention reduces coal 1-1! In order to solve the problem of large amount of dust when drying to 50%, we installed a heat transfer tube such as steam inside the rotating body and a drying zone formed by a louver installed inside the rotating body. A classification zone is formed in the section, and the flow rate of the hot gas sent from the classification zone into the rotating body is set to the flow rate at which the hot gas passes through the material in the classification zone and separates particles with a target particle size or less. By doing so, it is possible to obtain a rotary flow klJ type dryer by installing a heat transfer tube in the inner bottle that has both drying ability and fine powder separation. be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be explained in detail below based on the drawings showing one embodiment thereof. As shown in Figs. The classification 4g47 formed in a part of the dry zone (2) formed by the provided louver and the sales looper Heat exchanger tubes laid along the circumferential surface to carry a heat medium (2) such as steam, and coking coal for coking installed in the center of the #I wall at one end of the rotating body, inside the first part of the rotating body. Inlet of material to be supplied (to)
and an exhaust gas outlet for discharging hot gas (2) in the rotating body and mature gas (2) containing fine powder, which is provided in the material inlet with a tn inlet, and is also provided at the end side of one side wall of the rotating body rho. A hot gas introduction row that introduces hot gas (2) into the louver (to) No. 1111 with the size and size of the hatching shown in the whS diagram, and a side wall shaft at the other end that rotates together with the rotating body (b). A heat medium inlet (2) provided at the center for introducing the heat medium into the heat transfer tube (2), and a material outlet (2) provided at the lower part of the other end of the rotating body for discharging the dry material (2). It has The louver (to) and the classification band (transfer) are
The thickness is adjusted so that the inner space of the rotating body (roller) is formed into a radial space extending from the other end to the wheel side.

Note that the diameter of the louver may be made cylindrical and the whole may be tilted.The louver is composed of overlapping ()& plates as shown in the ms diagram, and supports the coking coal @ and discharges it with its inclination. to the side and into hot gas without material loss) (2)
is configured to freely pass through and falsify.

Then, the flow rate of the hot gas sent into the rotating body is adjusted so that the hot gas passes through the classification zone (to the coking coal above) and particles smaller than the target particle size are produced. - is configured to allow iui to separate the flow rate. Therefore, the main purpose of the louver is to dry coking coal for coking] and classify it. It can be said that the main purpose of the coking coal (2) is to classify the fine powder contained in the coking coal (2) while playing the role of drying.

With this configuration, the coking coal (2) supplied to the material inlet (2) is dropped onto the louver (to) which slowly rotates in the direction of the arrow together with the rotating body (b), and is exposed to hot gas from below. ) and then proceed to the 0 classification zone gradient while drying and proceeding to the classification zone, whereupon the hot gas (2) is further passed through, and the hot gas () has a preset flow velocity. Then, the fine powder (2) having a grain size of 411I or less in the coking coal (2) is separated and raised. The hot gas (2) containing the fine powder) and the hot gas (2) that passed through the coking coal (2) above the louver are discharged from the waste gas outlet row, and the fine powder (2) is then processed by a dust collector (not shown). The hot gas (c) introduced into the louver and the hot gas (2) introduced into the classification band are preferably both used in a coke oven using the dry material dried in this dryer. It is a good idea to save energy by using combustion exhaust gas. The coking coal (2) from which the fine powder has been separated and has been sufficiently dried is discharged from the material outlet and guided to the coke oven.

By the way, the fine powder function on the classification zone axis is 1 to dry coking coal for coking to a constant moisture content of 1 to 296.
A performance of approximately 0G mesh pass I% is desirable, and for this it is essential to completely remove the fine powder adhering to the coal surface.

11! The figure shows the test results regarding coal drying and fine powder separation performance, and shows test data using a fluidized bed for coking coal that has been dried to a moisture content of ljI%. This is shown in dust 11 from the lower test.

As is clear from this figure, the fine powder separation performance is better as the processing time is longer. In addition, the dust generation level 0 line was set to be equal to or lower than the dust generation level of dry coal with a moisture content of approximately 496 d in msi and FIG. 7. According to the rotary shaker type dry kh trout with a built-in heat exchanger tube according to the present invention, the louver and the classification? A heat transfer tube (22) is laid along the inner surface of one wheel to share part of the necessary supply heat with the hot gas, so the edge of the exhaust gas, which is a drawback of general ventilation rotary dryers, is eliminated. Compared to a rotary dryer with hot wire heat transfer tubes, it is 8 to i times larger, the dust collection equipment is larger, and its operating power is greater. It is possible to eliminate the disadvantages of dryers, such as the formation of burrs and ridges when drying sticky materials and moisture coal, which deteriorates transportability. In addition, since the heat transfer tube (2) is present in the fluid material (2), it improves the classification effect of fine powder adhering to the surface of coarse particles of the material, and also destroys the fine particles that have grown over km to improve the drying effect and classification effect. You can improve further.

Next, other embodiments will be described based on Figure @8 and Figure S. - is a rotary flow type dryer with a built-in heat exchanger tube in this embodiment, and the method of supplying hot gas to the dryer (b) described in -j in the text is different. In other words, the louver is divided into sections in the longitudinal direction, iib+, and sections A (2), section B (recommended), and section C), in which hot gas is introduced separately, are created. be.

Of each section (A) @ fC), the main purpose of section A and section B (6) is to dry mH coal (2) for coke x, and section C (Q is for coking coal for coke). (2)
The main purpose is to classify the fine powder (2) contained in the coke-making coal while playing the role of drying it.

Therefore, in Section C, the flow velocity of the hot gas (to be sent into the rotating body ring) is increased over the coking coal (2).
The hot gas tank passes through the inside of ) to separate the particles having a target particle size or less, and the flow rate can be adjusted so that the drying zone can be adjusted as in the drying zone in Example No. ζ. (2
) forms a classification belt in a part of the area. The gas flow velocity flowing through the coking coal in each section (2) is as shown in Figure 9 (6).
, @rry's, Section 8) has been adjusted to 01EQ/Raven, and Section C has been adjusted to OAtw'm. In section A (2), the hot gas (2) is fed at high speed on the material supply side, and the coking coal (e) remains at a high moisture content, so the louvers (to) and heat exchanger tubes ( 2) In order to prevent the risk of the coking coal adhering to the surface, hot gas (transfer) is sent at a relatively high speed in section C [) to the material discharge side. This is to make the flow velocity optimal for classification, and the reason why the lowest velocity hot gas (to) is sent to section B [F] sandwiched between section A and section C is to The amount of exhaust gas is reduced by mainly drying the heat medium (2) of the heat tube (2), and it also prevents re-sedimentation of the fine powder classified in section C), and heat transfer on the surface of the heat transfer tube (2). This is to increase the speed. In addition, each ward 111
(A) e) The flow velocity of the hot gas @ (to) (2) in the phantom is
Adjustments may be made to ensure optimal operating conditions based on the moisture content and particle size properties of the supplied coal.

With such a configuration, l! As is clear from the moisture values in Figure 9 (Figure 6+), the coking coal that had a moisture content of 9% at the time of supply was dried to a constant moisture content of 1% upon discharge, and the coking coal The imitation powder in the countryside will be re-sedimented on the A and B sections (2) (2) (with good hot gas t).
It is ejected together with i4II(2).

As described above, according to the present invention, since it has a drying capacity of 6 m and a fine powder dispersion capacity, it is not necessary to introduce the dry material into the subsequent equipment together with the dust-generating dust, unlike the conventional 0-layer dryer.
V! This makes it easy to load and transform lime, and removes dust, making it possible to charge lime that has been dried to tM moisture content into a coke oven.

tI! ! 1ikiO Simple Explanation Part 1 Figure 1 and WA8 Figure show a conventional example, Figure 1 is a perspective view of a rotary dryer with heat exchanger tube (AV, MG) is an aeration rotary rotary type II
A-Al
[The figure shows an embodiment of the present invention,
Figure 8 is a vertical cross-sectional view of the rotary flow type dryer with built-in heat exchanger tubes related to this plant, and Figure 1@4 is an enlarged vertical cross-section aa of the main part of Figure 8.
, The tin figure is a B-B cross-sectional view of the 4th section of the Yodokubanban section, and the 6th figure is '
Fig. 7 shows the cleaning conditions for coking coal for coking and the dust-generating index based on it, and Fig. 8 and Ill9. The figures show other embodiments of the present invention, Figure -8 is a vertical cross-sectional view of a rotary flow type dryer with built-in heat transfer tubes, and Figure 119 (a) shows the moisture value of the coal seam held in each louver. Figure 9b) is a diagram showing the gas flow velocity passing through the coal seam held in each louver.

(To) (B)...Rotating fluid dryer with built-in heat transfer tubes, (B)...Rotating body, Box...Louver, Han...Drying zone, Grain...Classifying belt, Cap・・Heat medium, (2)・・Heat transfer tube, (2)・・Coking coal for coke, @@−1・Hot gas, ni)・・Fine powder, ■・・A section, (6) ... B section, (Q - C section agent Yoshihiro Morimoto Figure 1 Figure Z Figure 4 Figure U Figure 614 - Moisture I Z) Figure 7 - 79 - 2nd "1" ToA↑(-4・-)Figure 0

Claims (1)

[Claims] 1. A louver is provided in the cylindrical rotating body to send hot gas from below, and the hot gas is passed through the wet material supplied into the rotating body to de-energize and dry the wet material. In the type dryer, a heat transfer tube for steam or the like is arranged in the rotating body, a classification zone is formed in a part of the drying zone formed by the louver, and the classification zone is fed into the rotating body. Rotary flow klI type drying with a built-in heat exchanger tube characterized in that the tIrL speed of the hot gas introduced is set to a flow rate at which the nuclear hot gas passes through the material in the classification zone and separates particles smaller than the particle size. -0