JPH1047630A - Rotary drying/combustion apparatus for wet substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary drying/combustion apparatus for wet material which is safe, stable and highly efficient without causing environmental pollution with a higher filling rate. SOLUTION: An internal cylindrical body 2 has partitions 5 almost parallel with an axis to divide an internal space in plurality and a plurality of guide plates 17A and 17B which are mounted on both sides of the partition walls 16 so as to be jointly installed radially being inclined to the axis 1. Spaces divided by the partition walls 16 partially communicate with one end part in the direction of the axis 1 at a position closer to the other end part thereof and an external cylindrical body has a combustion chamber 13 on the side of the other end part. A delivery port 4B of the internal cylindrical body 2 is opened to communicate with the combustion chamber 13 while the combustion chamber 13 is provided with a second feed port 8B of the external cylindrical body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to industrial raw materials, intermediate raw materials or wastes (hereinafter referred to as "raw materials") in the form of wet granules or slurries, filter cakes or viscous liquids.
The present invention relates to a rotary-dry combustion device for a wet substance that dries and burns combustible materials contained in the same.

[0002]

2. Description of the Related Art The applicant has proposed a rotary drying combustion apparatus for wet substances in Japanese Patent Application Laid-Open No. Hei 8-28836. The apparatus includes an inner tubular body having an opening at one end and the other end, and an outer tubular body having an opening at one end and the other end.
The outer tube forms an annular space with the inner tube and rotates with the inner tube about a substantially horizontal axis. The inner cylindrical body has a partition wall that divides the inner space into a plurality,
It has a plurality of guide plates attached to both sides of the partition wall inclined with respect to the axis, and the other end of the inner tubular body is opened so as to communicate with the internal space at the other end of the outer tubular body. In the internal space at the other end of the outer cylindrical body, a gas supply for blowing air from the outside into the internal space is provided.

[0003] Raw materials and the like are supplied to the internal cylindrical body through an opening at one end of the internal cylindrical body, and then a partition wall on which a guide plate is installed and rotation of the internal cylindrical body provided with the partition wall. It circulates between both ends of the inner cylindrical body while rolling, and is dried by heating from the high-temperature combustion gas flowing through the annular space between the outer cylindrical body and the other end of the inner cylindrical body. It is fed into the internal space at the other end of the outer cylindrical body from the opening. In the internal space on the other end side of the outer cylindrical body formed so as to surround the other end with the inner cylindrical body, dry powder and granules are burned by air supplied from the outside, and Generates combustion gas. The gas flows from the internal space through the annular space and heats the internal cylindrical body from the outside. Also,
After the dried powder is burned, the powder is discharged from the inner space at the other end of the outer tubular body through the annular space through the opening at one end of the outer tubular body.

[0004]

Since the above-described apparatus dries and burns a raw material or the like, which is a combustible material containing a large amount of moisture, it achieves substantial self-combustion with little need for fuel, and particularly, heavy oil and the like. The use of auxiliary fuel can be minimized. However, since the wet raw materials and the like have a large water content, the amount of heating required for drying is large, and in the above-described apparatus, the entire amount of the raw materials and the like must be supplied to the inner cylindrical body and heated here. In order to transfer the heat energy to the whole amount of raw materials, the surface area of the inner cylindrical body must be increased.

[0005] Dried raw materials and the like generate a large amount of heat,
In the internal space at the other end of the outer tubular body, it is necessary to keep the combustion temperature low in order to prevent sintering of ash at the time of combustion. Heat energy recovery by gas recirculation must be used.

When the raw material is a wet substance mainly composed of an organic substance such as sewage sludge, a large amount of nitrogen is contained. However, when the dried substance is burned by the above-mentioned apparatus, the generation of nitrogen oxides increases. There is a possibility that the allowable reference value may be exceeded.

[0007] The present invention solves the above-mentioned problems of the conventional apparatus, and continuously converts a wet granular material, a slurry, a filter cake, a viscous liquid material, and the like into a rotating cylindrical body. When drying and burning combustible materials such as raw materials, the filling rate of the raw materials etc. in the cylindrical body is high, and it is possible to perform safe, stable and highly efficient continuous operation without causing environmental pollution, and construction cost and operation It is an object of the present invention to provide an inexpensive wet substance rotary drying / combustion apparatus.

[0008]

The device of the present invention comprises an inner tubular body and an outer tubular body. The inner cylindrical body is made of a heat transfer material, has a substantially horizontal axis of rotation, and has at one end of the axis a first input port for a raw material of a wet substance, and at the other end a delivery port. Further, the outer cylindrical body has an axis substantially common to the axis of the inner cylindrical body, and has a discharge port for discharging the heated raw material or the like at one end of the axis and a raw material or the like at the other end. It has a second input port. The outer tubular body forms an annular space between the outer tubular body and the inner tubular body, and rotates together with the inner tubular body. The inner cylindrical body was attached to both surfaces of the partition wall which divides the internal space into a plurality of sections and which was substantially parallel to the axis, and which were substantially inclined with respect to the axis and juxtaposed in the axial direction. It has a plurality of guide plates. The spaces partitioned by the partition walls partially communicate with each other at positions near one end and the other end in the axial direction. The outer tubular body has a combustion chamber on the other end side, and the delivery port of the inner tubular body is open so as to communicate with the combustion chamber, and the second input port communicates with the combustion chamber. It is provided in.

In the apparatus of the present invention having such a structure, first, a part of the wet raw material or the like is supplied into the internal cylindrical body from the first inlet provided at one end of the internal cylindrical body. The inner tubular body rotates around the axis integrally with the outer tubular body.During this rotation, the above-mentioned part of the wet raw materials and the like are already thrown in the inner tubular body while being rolled. It is mixed into dry, high-temperature agglomerates circulating in the inner cylinder,
The raw materials and the like undergo rapid evaporation by receiving heat from the high-temperature granular mass, and drying proceeds. That is, at that time, the thermal energy required for evaporation of water at the time of injection is supplied by the high-temperature granular material mass that is located near the first input port during circulation in the internal cylindrical body. Become.

[0010] By the rotation of the inner cylindrical body, the lump of particles in the inner cylindrical body is moved between a plurality of spaces divided by the partition wall and one end of the partition wall by the action of the partition wall and the guide plate. Circulates through the communication space on the other end side. The mass of particles circulating in this manner is formed by combustion energy flowing through the annular space formed between the inner cylindrical body and the outer cylindrical body in the axial direction, by thermal energy given through the inner cylindrical body, Heat to the temperature required for drying.

[0011] The mass of powder and granules dried by receiving the above-mentioned heat exits from the delivery port on the other end side of the inner cylindrical body, and the other end of the outer cylindrical body concentrically arranged with the inner cylindrical body. It is transferred into the combustion chamber formed on the side of the unit. The combustion chamber is provided with a second input port for additional input of raw materials and the like, and the dried high-temperature powder mass is heated in the combustion chamber together with the newly input wet raw material and the like to increase the temperature. You. In this case, preferably, a supply gas for supplying combustion air from the outside is provided in the combustion chamber, and combustion is promoted by air supplied from the supply gas into the combustion chamber.

[0012] The high-temperature combustion gas generated by combustion in the combustion chamber and the burned-up particulate mass form an annular space between the inner cylindrical body and the outer cylindrical body with rotation, and if necessary, the inner cylindrical body. It flows through the hollow space formed in the partition wall to one end side and is heated by the retained heat from the outer peripheral surface of the inner cylindrical body and, if necessary, from inside the partition wall to dry the raw materials etc. To the raw material and the like,
The temperature of the device itself drops, and it is guided to the outside of the device through a discharge port provided near one end of the outer cylindrical body.

By adjusting the ratio of the transported amount of the dry raw material and the like and the supply amount of the wet raw material and the like to be additionally supplied, it is possible to maintain the combustion temperature of the granular mass in the combustion chamber at a proper and safe desired temperature. it can.

In the case of raw materials containing a large amount of nitrogen, such as sewage sludge, organic / inorganic mixed materials, and marine and livestock wastes, burning this in a dry state increases the generation of nitrogen oxides. By combusting this with an added wet raw material or the like at an appropriate mixing ratio, the ammonia gas generated from the latter exerts a denitration effect, and significantly reduces the generation of harmful nitrogen oxides. The mixing ratio varies depending on components such as raw materials, conditions, and combustion conditions.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a substantially horizontal axis 1 is shown.
, An inner cylindrical body 2 mainly made of a heat transfer material and an outer cylindrical body 3 mainly made of a heat resistant material are integrally rotatably supported by bearings (not shown), and are rotated by means (not shown). Is receiving. The inner cylindrical body 2 has two openings, one of which is a first input port 4A for supplying raw materials and the like, and the other is a delivery port 4B. The internal cylindrical body 2 is divided into a plurality of internal spaces, in the illustrated example, two internal spaces by a partition wall 5 extending to an intermediate portion along the axis 1 and attached in parallel with the paper surface.

A plurality of guide plates 6 are mounted on both sides of the partition wall 5. The guide plate 6 is attached at an angle. The raw materials and the like in the space partitioned by the partition wall 5 are lifted up by one surface of the partition wall 5 with the rotation of the inner cylindrical body 2, and then slide down along the guide plate 6. At this time, FIG.
In the case of rotating clockwise as viewed from the left end, the raw materials and the like in the space on the near side of the partition wall 5 on the paper surface slide down toward the delivery port 4B.

In FIG. 1, when the inner cylindrical body 2 is rotated by 180 degrees around the axis 1, the space on the other side of the paper with respect to the partition wall 5 in FIG. 1 moves to this side. The inclination of the guide plate is opposite to that of the guide plate shown in FIG. 1, so that the granular material due to the sliding moves in the direction of the first input port 4A at one end. That is, due to the rotation of the inner cylindrical body 2, the granular material circulates in two spaces separated from the partition wall 5.

In FIG. 1, reference numeral 7 denotes a feed pipe for a part of the raw material and the like, which is provided so as to penetrate the inlet 4A of the inner cylindrical body 2. At that time, the inlet pipe 7 is not limited to the one shown in FIG. 1, and its type, type, and dimensions are arbitrary.

FIG. 2 is a sectional view taken along the line II-II in FIG.
This is an example of a case where one partition wall 5 is installed inside the inner tubular body 2 to divide the internal space of the inner tubular body 2 into two.
In FIG. 2, reference numeral 6 denotes a guide plate provided on both side surfaces of the partition wall 5, and reference numeral 8A denotes a discharge port provided near one end of the outer cylindrical body 3.

In FIG. 1, one end of the inner cylindrical body 2 in which the feed pipe 7 for the raw material and the like is installed is not necessarily limited to the shape shown in FIG. 1, and for example, as shown in FIG. 2
At the end of the partition wall 5 rotating around the axis 1, there are provided a plurality of crushing rods 9 projecting radially inward, and a plurality of projecting radially outwardly fixed to a feed pipe 7 for non-rotating raw material. A crushing rod 10 can be provided.

The feed pipe 7 for the raw material and the like in FIG. 1 is not necessarily limited to the one shown in FIG. 1, and the air for burning the combustible gas generated in the inner cylindrical body 2 is fed together with the raw material and the like. An air line can be provided. Such an air supply pipe is not limited to the inlet pipe 7, and may be provided through the first inlet 4 </ b> A of the internal tubular body 2.

The configuration of the section taken along the line II-II in FIG. 1 is not necessarily limited to that shown in FIG. 2. For example, by providing two or more partition walls 5 in FIG. It may be divided into a plurality. In the case shown, the interior space is divided into four by providing two intersecting partition walls 5. Further, the number, the position, and the shape of the discharge ports 18 provided at one end of the outer cylindrical body 3 are not limited to those shown in FIG. 2, and may be, for example, as shown in FIG.

Although the partition wall 5 itself is not hollow as shown in FIGS. 2 and 4, the partition wall shown in FIG. 1 is limited to the partition wall as shown in FIGS. Instead, as shown in FIG. 5, the partition wall 5 may have a hollow portion 11 in which the combustion gas and the powdery solid after the end of the combustion flow in the axial direction. FIG. 6 shows another example of a partition wall having a hollow portion. Thus, the number and shape of the hollow spaces are arbitrary.

In FIG. 1, the other end of the inner cylindrical body 2 in the direction of the axis 1 is a tapered tubular transfer section 12 having a small inner diameter and diverging. The outer cylindrical body 2 passes through a delivery port 4B which is an opening. 3 faces the inside of a cylindrical combustion chamber 13 formed at the other end. FIG. 7 is a cross section taken along the line VII-VII in FIG.
An annular gap 15 is formed between a transfer section 12 and a circular weir 14 that is provided to protrude radially inward in a combustion chamber 13 that is the other end of the outer cylindrical body 3. The tubular transfer section 14 in FIG.
Is not necessarily limited to the illustrated tapered tubular member as long as it has a smaller diameter than the inner cylindrical body 2, and may be a straight tubular member. A partition wall 16 as shown in FIG.
May be installed inside. The partition wall in FIG. 8 is shown at a vertical position, and a plurality of guide plates 17A and 17B inclined with respect to the axis are installed on both side surfaces thereof. In FIG. 8, the dashed line indicates a guide plate 17B provided on the side of the partition wall opposite to the paper surface. The guide plate 17A on the front side is rotated by 180 ° around the axis.
Are arranged so as to coincide with the position of. The transfer section 14 is not limited to those shown in FIGS. 1 and 8, and may be, for example, provided with a screw blade guide plate.

The other end of the outer cylindrical body 3 in FIG. 1 forms a short cylindrical combustion chamber 13, in which a gas supply 18 is installed, and a rotary joint 20 is connected through an external air inlet pipe 19. The air fed through is blown out from the hole of the air supply plate 21 toward the inside of the combustion chamber 13. The above rotary joint 2
0 allows relative rotation between the outer cylindrical body 3 and the gas supply 18 while maintaining the seal.

In the combustion chamber 13 formed at the other end of the outer cylindrical body, a feed pipe 22 for additional raw material and the like is provided at a second end formed at the other end of the outer cylindrical body. It is installed so as to penetrate through the second charging port 8B, and is configured to additionally feed a wet raw material or the like into the rotating combustion chamber 13. In FIG.
In the example shown in FIG. 9 as an IX-IX cross section, a porous short cylindrical gas supply 21 is provided along the combustion chamber 13, and a hollow annular cylinder is provided between the gas supply plate 21 and the combustion chamber wall. Is formed, and the air sent from the outside is jetted into the combustion chamber 1 through the air supply hole of the gas supply 21 to promote the combustion of the raw material in the form of powder and granules rolling on the gas supply plate 21.

The air supply plate is not limited to the configuration shown in FIG. 9, and for example, as shown in FIG. 10, air is separately supplied to each of the plurality of partition spaces in which the inner space of the annular cylindrical body is partitioned by the partition plate 23 in the circumferential direction. Can be sent. Further, baffle plates 25 projecting radially inward from the air supply plate 21 can be provided at a plurality of positions in the circumferential direction so as to assist the rolling of the granular material mass. At that time, the partition plate 23 and the baffle plate 25 may be at the same position or different positions in the circumferential direction, and their number and shape are arbitrary.

The structure and shape of the gas supply are not necessarily limited to those shown in FIGS. 1, 9 and 10, but are provided inside the combustion chamber 13 which is the end of the outer cylindrical body, and What is necessary is just to be able to send air into the combustion chamber through the air supply plate into the granular mass layer.

In the apparatus of this embodiment, first, in FIG. 1, the wet raw material and the like are fed into one end of the inner cylindrical body 2 through the feed pipe 7. In the inner cylindrical body 2, raw materials and the like are separated by a partition wall 5 rotating around the axis 1 and a guide plate 6.
Is mixed into the hot dry granules circulating due to the action of and heated by the inner cylindrical body 2 while riding the circulating flow.
Dried inside. The heat energy required for drying is provided by heat transfer from the high-temperature combustion gas flowing through the annular space 26 between the inner cylindrical body 2 and the outer cylindrical body 3.

In FIG. 1, a high-temperature dry raw material circulating inside the inner tubular body 2 is transferred to the outside through a tapered tubular transfer section 12 provided at the other end of the inner tubular body 2 and its delivery port 4B. It is fed into the combustion chamber 13 formed at the end of the tubular body 3. When flammable gas is generated during drying in the inner cylindrical body 2, air is fed through the inlet pipe 7 in FIG. The combustible gas can be burned inside the body 2 or the delivery port 12.

In FIG. 1, the dry raw material and the like delivered from the inner cylindrical body 2 to the combustion chamber 13 formed at the other end of the outer cylindrical body are placed on an air supply plate 21 provided for the gas supply 18. Falls on the hot mass of particles that roll. Then, an additional wet raw material or the like is fed into the combustion chamber 13 of the outer cylindrical body through the inlet pipe 22, and the wet raw material or the like is combined with the dry raw material or the like in the combustion chamber 13 and supplied. The air supplied through the air plate 21 burns on the air supply plate 21 in the state of a rolling layer.

The generated high-temperature combustion gas passes through an annular gap 15 from the inside of a combustion chamber 13 formed at the other end of the outer cylindrical body 3 shown in FIG. Body 3
And heats the inner cylindrical body 2 to give heat energy necessary for drying the raw materials and the like. that time,
The combustion gas is not limited to only the annular space 26, but is shown in FIGS.
The inner cylindrical body 2 can be heated by flowing through the hollow channel 11 of the partition wall 5 as exemplified in FIG. The heated combustion gas is guided to the outside of the apparatus through an outlet 8 which is an opening of the outer cylindrical body as shown in FIGS.

Residual solids generated by combustion inside the combustion chamber 13 are rotated by the rotation of the combustion chamber 13 to form a circular weir 14.
Through the annular gap 15 to reach the annular space 25 between the inner tubular body 2 and the outer tubular body 3 and is guided by both the rotation of the outer tubular body and the flow of the combustion gas. At that time, a spiral or flat baffle plate may be provided in the annular space to assist the movement of the powdery and solid lumps.

[0035]

As described above, according to the present invention, a part of the wet raw material and the like is additionally charged into the high-temperature dry powder mass which is first charged into the inner cylindrical body and circulated therein. When mixed and dispersed, it can be dried quickly. That is,
Since the entire amount of the wet raw materials and the like was self-burning in the inner cylindrical body, the entire amount had to be dried and the temperature was higher than necessary. Therefore, the temperature becomes appropriate, and the processing capacity is increased by the amount of the additional raw material and the like. Further, in the present invention, the raw material in the form of a granular mass and the like that has been previously introduced and dried is rolled together with the additional wet raw material and the like that is directly fed into the combustion chamber, and is preferably mixed with the jet air from the supply gas. , The combustion efficiency is high and the combustion temperature can be kept at an appropriate low temperature.

[0036] Only a part of the wet raw material to be treated is dried first, and the additional wet raw material is directly sent into the combustion chamber.
Since combustion can be performed at an appropriate low temperature, the heat transfer area of the inner cylindrical body for drying can be reduced.

Since an additional wet raw material or the like is directly fed into the combustion cylinder chamber, for example, in the case of a raw material having a high nitrogen content such as sewage sludge, ammonia gas generated at the same time as the input is burned during combustion. It reacts with the generated nitric oxide to bring about a denitration effect. Further, the additional raw material and the like do not need to be the same substance as the raw material and the like previously charged into the inner cylindrical body. For example,
It is more effective to select an extraneous substance that easily adheres to the surroundings in a wet state or a substance that has a strong odor.

A part of the wet raw material and the like are dried first, and the additional raw material and the like are charged into the combustion chamber while being wet, and the generated combustion gas is used as a heat energy source for drying. It will provide substantial self-burning,
The use of auxiliary fuel can be minimized.

The operation is facilitated because the amount of excess air is kept appropriate and there is no need to recirculate the combustion gas.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a device including an axis of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view showing an example in which a crushing rod is installed at one end of an internal tubular body, which is applicable to the apparatus in FIG. 1;

FIG. 4 is a cross-sectional view showing another example of a partition wall applicable to the apparatus in FIG. 1;

FIG. 5 is a sectional view showing still another example of a partition wall applicable to the apparatus in FIG. 1;

FIG. 6 is another example of the cross section showing still another example of the partition wall applicable to the apparatus in FIG. 1;

FIG. 7 is a sectional view taken along the line VII-VII of the apparatus in FIG. 1;

8 is a cross-sectional view showing another example of the transfer pipe installed at the other end of the internal cylindrical body of the apparatus in FIG.

FIG. 9 is a sectional view taken along the line IX-IX of the apparatus in FIG. 1;

10 is a cross-sectional view illustrating another example of the combustion chamber applicable to the apparatus in FIG. 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axis 2 Inner cylindrical body 3 External cylindrical body 4A First inlet 4B Delivery port 5 Partition wall 6 Guide plate 8A Outlet 8B Second inlet 13 Combustion chamber 16 Partition wall 17A, 17B Guide plate 18 Gas supply 25 Baffle Board 26 Annular space

Claims (5)

[Claims] An inner cylindrical body made of a heat transfer material, having a rotation axis substantially horizontal, having a first input port at one end of the axis for a raw material of a wet substance and a delivery port at the other end; An outer cylindrical body having an axis substantially common to the axis of the inner cylindrical body and having an outlet at one end of the axis for discharging the heated raw material and the like and a second inlet at the other end for the raw material and the like. And the outer tubular body forms an annular space between the outer tubular body and the inner tubular body, rotates together with the inner tubular body, and the inner tubular body extends along the axis dividing the inner space into a plurality. It has a substantially parallel partition wall, and a plurality of guide plates attached to the surface of the partition wall so as to be inclined and provided in the axial direction with respect to the axis, and the spaces separated by the partition wall are separated from each other by an axis. The outer cylindrical body has a combustion chamber on the other end side, and the inner cylindrical body is partially communicated with one end in a direction near the other end. A rotary drying and burning apparatus for wet material, wherein a delivery port of the body is opened so as to communicate with the combustion chamber, and a second input port is provided so as to communicate with the combustion chamber. 2. The rotary dry combustion apparatus for a wet substance according to claim 1, wherein the combustion chamber is provided with a supply gas for supplying air supplied from outside to the combustion chamber. 3. The gas supply has a hollow annular cylindrical body formed along a cylindrical inner surface of a combustion chamber, and an air supply pipe for supplying air to the annular cylindrical body. 3. The rotary drying and burning apparatus for wet substances according to claim 2, wherein an air supply hole for ejecting water is formed. 4. The internal space of the annular cylinder for supplying gas is divided into a plurality of chambers in the circumferential direction, and air is selectively removed from the chamber which is located below as the outer cylinder rotates around the axis. The rotary drying and burning apparatus for wet substances according to claim 3, wherein the apparatus is capable of ejecting water. 5. The rotary drying apparatus according to claim 2, wherein baffle plates for scraping up raw materials and the like are provided at a plurality of positions in a circumferential direction on a radially inner surface of the annular cylindrical body. Combustion equipment.