Kiln body oxygenating device of rotary kiln for disposing and utilizing accumulated slag

Abstract

The utility model discloses a rotary kiln body oxygenating device for disposal and utilization of accumulated slag, which comprises a rotary kiln body, the rotary kiln body comprises a barrel and a refractory layer, the refractory layer is laid on the barrel, an oxygenating device is additionally arranged in the middle of the rotary kiln body, and the barrel is connected through the oxygenating device at the joint; the oxygenating device comprises a connecting sleeve, an inner neck cylinder, refractory bricks, an air outlet and an oxygenating fan, the connecting sleeve and the cylinder body are fixed through bolts, the connecting sleeve is provided with the inner neck cylinder extending into the cylinder body, the refractory bricks are built in the inner neck cylinder, a gap between the connecting sleeve and the inner neck cylinder is an air chamber, and the air outlet is reserved between the refractory layer and the refractory bricks during building. And an oxygen increasing fan for increasing oxygen into the air chamber is mounted on the outer side of the connecting sleeve. According to the disposal and utilization method of the accumulated slag containing sublimed sulfur and ammonium sulfate, the oxygen supplementation fan is additionally arranged in the middle of the rotary kiln body for oxygen supplementation, manganese slag is fully combusted, the problem that sublimed sulfur is generated due to insufficient oxygen in the calcining process of the rotary kiln is solved, and reduction of the sublimed sulfur is achieved; further, the generation amount of accumulated slag containing sublimed sulfur and ammonium sulfate in the washing tower is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, in particular to a rotary kiln body oxygen supplement device for the treatment of accumulated slag. Background Art

[0002] The harmless treatment of electrolytic manganese slag and the comprehensive utilization of resources are divided into two sections, namely the high-temperature calcination section and the flue gas sulfuric acid section. The high-temperature calcination section is to dry and crush the raw materials, add a reducing agent and then calcine and desulfurize them in a rotary kiln. The desulfurized manganese slag produced after calcination of the electrolytic manganese slag is used as a raw material for cement production or as a substitute for building aggregates. The flue gas sulfuric acid section uses the high-concentration sulfur dioxide flue gas generated by the high-temperature calcination section. After deammoniation, purification and drying, it adopts the "two-turn and two-absorption" sulfuric acid production process to produce sulfuric acid.

[0003] When the oxygen content is insufficient during the calcination process of the rotary kiln, sublimated sulfur will be produced in the flue gas. After the flue gas is sprayed and washed in the scrubbing tower, sublimated sulfur, ammonium sulfate and dust will be enriched, thereby forming slag accumulation, which makes the washing nozzle easily blocked and affects the continuous operation of production. Therefore, a slag disposal method is proposed, which utilizes a rotary kiln body oxygen supplementation device to increase the oxygen content during the calcination process of the rotary kiln. Summary of the invention

[0004] The object of the present invention is to provide a method for disposing and utilizing slag containing sublimed sulfur and ammonium sulfate to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The accumulated slag is disposed of by using a rotary kiln body oxygen supply device, which includes a rotary kiln body, wherein the rotary kiln body includes a cylinder and a refractory layer, the refractory layer is laid on the cylinder, an oxygen supply device is added in the middle of the rotary kiln body, and the joint of the cylinder is connected by the oxygen supply device;

[0007] The oxygen supply device includes a connecting sleeve, an inner neck tube, refractory bricks, an air outlet and an oxygen-enriching fan. The connecting sleeve is fixed to the cylinder by bolts. The connecting sleeve is provided with an inner neck tube extending into the cylinder. Refractory bricks are laid in the inner neck tube. The gap between the connecting sleeve and the inner neck tube is an air chamber. An air outlet is left between the refractory layer and the refractory bricks during masonry. An oxygen-enriching fan for adding oxygen to the air chamber is installed on the outside of the connecting sleeve.

[0008] As a further solution of the present invention: the inclination angle of the rotary kiln body is 4° to 5°, the inner neck tube is in a truncated cone shape, the inner neck tube and the rotary kiln body maintain the same central axis, and the inclination angle of the refractory bricks inside the inner neck tube to the horizontal line is 2° or more.

[0009] As a further solution of the present invention: the refractory bricks are wedge-shaped, the refractory bricks are laid in a truncated cone shape, extending into the interior of the refractory layer, and the distance of the refractory bricks into the interior of the refractory layer is 1m-2m.

[0010] As a further solution of the present invention: a support arm is arranged between the connecting sleeve and the inner neck tube.

[0011] As a further solution of the present invention: the oxygen enrichment fan is connected to the air chamber through a pipeline, and a remotely controllable air valve is provided on the pipeline.

[0012] As a further solution of the present invention: there are multiple pipes, which are distributed in an equidistant ring outside the connecting sleeve, and a brush ring is set outside the pipe. The stationary part of the brush ring is connected and fixed to the carrier, and the rotating part is fixed outside the pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The method for disposing and utilizing accumulated slag containing sublimated sulfur and ammonium sulfate adds oxygen by adding an oxygen-supplementing fan in the middle of a rotary kiln body to fully burn the manganese slag, thereby solving the problem of sublimated sulfur being generated due to insufficient oxygen during the calcination process of the rotary kiln, achieving a reduction in the amount of sublimated sulfur, and further reducing the amount of accumulated slag containing sublimated sulfur and ammonium sulfate generated in a washing tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a process flow chart of a method for disposing and utilizing slag containing sublimated sulfur and ammonium sulfate;

[0016] Figure 2 It is a structural schematic diagram of an oxygen supplementation device;

[0017] Figure 3 It is the left view of the structure of the inner neck tube.

[0018] In the figure: 1. cylinder; 2. refractory layer; 3. connecting sleeve; 4. inner neck cylinder; 5. refractory brick; 6. support arm; 7. air chamber; 8. brush ring; 9. air valve; 10. oxygen enrichment fan; 11. air outlet. DETAILED DESCRIPTION

[0019] Embodiment 1

[0020] See also Figures 1 to 3 In an embodiment of the present invention, a method for disposing and utilizing slag containing sublimated sulfur and ammonium sulfate comprises the following steps:

[0021] S1: The washing liquid of the washing tower is separated from the liquid phase by the filter press, and the accumulated slag is directly sent to the tail smoke chamber of the rotary kiln through the conveying device for calcination in the kiln. The slag conveying device adopts a metering conveying device, which measures and conveys the accumulated slag after the filter press separation, and directly enters the tail smoke chamber of the rotary kiln for calcination in the kiln. In view of the problems of many process links, environmental pollution, equipment corrosion, etc. caused by the transportation of accumulated slag, this patent adopts the method of installing a slag conveying device next to the slag room after the filter press separates the accumulated slag, and adopts the metering conveying device to measure and convey the accumulated slag after the filter press separation, and directly enters the tail smoke chamber of the rotary kiln for calcination in the kiln without passing through the preheater C2 flue;

[0022] S2: The dry slag is calcined in a rotary kiln, and the sublimated sulfur in the slag reacts with oxygen to generate sulfur dioxide, and ammonium sulfate decomposes into sulfur dioxide, ammonia and water. The sublimated sulfur content in the dry slag is 50-60%, and the ammonium sulfate content is 20-30%. After calcination in a rotary kiln, the sublimated sulfur in the slag reacts with oxygen to generate sulfur dioxide, and ammonium sulfate decomposes into sulfur dioxide, ammonia and water:

[0023] The reaction formula is as follows;

[0024] S+O 2 →SO 2 ;

[0025] (NH 4 ) 2 SO 4 →SO 2 ↑+H 2 O+N 2 ↑+ NH 3 ↑;

[0026] S3: The flue gas is collected by the electrostatic precipitator at the end of the kiln, washed and cooled by the scrubber, and then enters the acid making section to make acid;

[0027] S4: Utilize the high-concentration sulfur dioxide flue gas generated in the high-temperature calcination section, and after deammoniation, purification and drying, use the "two-rotation and two-absorption" sulfuric acid production process to produce sulfuric acid. Use a rotary kiln for high-temperature calcination to achieve the recovery of sulfur dioxide and ammonia, increase the sulfur dioxide concentration in the rotary kiln flue gas, and thus achieve the purpose of high-value resource recycling of accumulated slag, while reducing process links, saving costs, and solving the problems of environmental pollution caused by transportation and storage of the original process.

[0028] In a preferred embodiment, an oxygen supply device is added to the middle of the rotary kiln body to supply oxygen so that the manganese slag can be fully burned in the rotary kiln to generate sulfur dioxide, thereby reducing the amount of sublimated sulfur generated, and further reducing the amount of slag formed. In view of the problem that sublimated sulfur will be generated in the flue gas when the oxygen content is insufficient during the calcination process of the rotary kiln, the flue gas will be enriched with sublimated sulfur, ammonium sulfate and dust after spray washing in the washing tower, thereby forming slag, causing the washing nozzle to be easily blocked, affecting the continuous operation of production, this patent adds an oxygen supply fan in the middle of the rotary kiln body to supply oxygen so that the manganese slag can be fully burned in the rotary kiln to generate sulfur dioxide, thereby reducing the amount of sublimated sulfur generated, and further reducing the amount of slag formed.

[0029] An oxygen supplementation device, a rotary kiln body comprises a cylinder 1 and a refractory layer 2, and the refractory layer 2 is laid on the cylinder 1;

[0030] The connection of the cylinder 1 is connected by an oxygen supplement device, which includes a connecting sleeve 3, an inner neck tube 4, refractory bricks 5, an air outlet 11 and an oxygen-enhancing fan 10. The connecting sleeve 3 is fixed to the cylinder 1 by bolts. The connecting sleeve 3 is provided with an inner neck tube 4 extending into the cylinder 1, and refractory bricks 5 are built in the inner neck tube 4. The gap between the connecting sleeve 3 and the inner neck tube 4 is an air chamber 7. An air outlet 11 is left between the refractory layer 2 and the refractory bricks 5 during masonry. An oxygen-enhancing fan 10 for oxygenating the air chamber 7 is installed on the outer side of the connecting sleeve 3. The rotary kiln is mainly composed of a supporting wheel bearing group structure, a hydraulic stopper wheel, a cylinder shell, a large gear, a small gear, a power device, and a kiln head and kiln tail seal. The cylinder shell is composed of multiple sections of cylinders 1, and the cylinders 1 are interconnected. The oxygen supplement device is installed between the two cylinders 1 and is located in the middle part of the cylinder shell. Oxygenation is achieved by modifying the existing rotary kiln. Oxygen supplementation, the oxygen supplementation device rotates with the cylinder 1, and the air intake and blowing in require an additional air outlet 11, which will also cause slag accumulation to enter the air outlet 11 and cause blockage. Therefore, the inner neck tube 4 and the refractory bricks 5 form a truncated cone and enter the cylinder 1. The rotary kiln itself has a certain inclination, and the inclination is generally between 1°-5°. Therefore, a truncated cone-shaped inner neck tube 4 and refractory bricks 5 are arranged in the inclined cylinder 1 for feeding. The gap between the refractory bricks 5 and the refractory layer 2 can be oxygenated, and the inclination can also prevent slag accumulation from entering and blocking the air outlet 11. The structure is simple and the modification cost is low. The refractory bricks 5 are laid inside the inner neck tube 4, and the inner neck tube 4 provides good support for the masonry of the refractory bricks 5. The refractory bricks 5 provide good high-temperature protection for the inner neck tube 4. The refractory bricks 5 and the refractory layer 2 are leveled by refractory brick adhesive to avoid protruding materials.

[0031] In a preferred embodiment, the inclination angle of the rotary kiln body is 4° to 5°, the inner neck tube 4 is in the shape of a truncated cone, the inner neck tube 4 and the rotary kiln body maintain the same central axis, the refractory bricks 5 inside the inner neck tube 4 have an inclination angle of 2° or more with the horizontal line, the refractory bricks 5 are wedge-shaped, the refractory bricks 5 are built in the shape of a truncated cone, and extend to the inside of the refractory layer 2, and the distance that the refractory bricks 5 are built into the inside of the refractory layer 2 is 1m-2m. Due to the increase of the refractory bricks 5 built in the shape of a truncated cone, the inclination angle of the rotary kiln body needs to provide a margin for the inclination of the refractory bricks 5 inside the inner neck tube 4, so as to avoid accumulation of slag entering the refractory bricks 5 inside the inner neck tube 4, resulting in accumulation and blockage, uneven feeding, and ultimately affecting the heating of the slag, which is counterproductive.

[0032] In a preferred embodiment, a support arm 6 is provided between the connecting sleeve 3 and the inner neck tube 4, the oxygen enrichment fan 10 is connected to the air chamber 7 through a pipeline, a remotely controllable air valve 9 is provided on the pipeline, there are multiple pipelines, which are equidistantly distributed in annular shapes outside the connecting sleeve 3, a brush ring 8 is set outside the pipeline, the stationary part of the brush ring 8 is connected and fixed to the carrier, and the rotating part is fixed outside the pipeline, the oxygen enrichment fan 10 is regulated according to the amount of oxygen supplement, and multiple oxygen enrichment fans 10 are prepared, and the amount of oxygen supplement is controlled by selectively starting the oxygen enrichment fan 10, the air chamber 7 is used to balance the uniform oxygen output, when the oxygen enrichment fan 10 is operating, the internal air pressure of the air chamber 7 is greater than the air pressure of the cylinder 1, so that the flue gas after the reaction is discharged through the channel, not only oxygen is added by the blown airflow, but also flame sintering is avoided, this technical solution adopts a metering and conveying device to separate the sublimated sulfur-containing The accumulated slag and ammonium sulfate are metered and directly transported to the tail smoke chamber of the rotary kiln, which changes the slag entering the kiln process, avoids the generation of sublimated sulfur in the preheater, and achieves the reduction of sublimated sulfur. The accumulated slag is calcined at high temperature in the rotary kiln to produce sulfur dioxide flue gas, which increases the sulfur dioxide concentration in the rotary kiln flue gas, solves the problems of accumulated slag transportation, storage and kiln calcination metering, reduces the transportation and storage process links, saves costs, and achieves the purpose of high-value resource recycling of accumulated slag containing sublimated sulfur and ammonium sulfate. At the same time, metering and conveying equipment is used to solve the corrosion problem of the original production line equipment, extend the service life of the equipment, and save equipment maintenance costs. An oxygen supplement fan is added in the middle of the rotary kiln body to supplement oxygen, so that the manganese slag is fully burned, and the problem of sublimated sulfur generated due to insufficient oxygen during the calcination process of the rotary kiln is solved, and the sublimated sulfur is reduced. The amount of accumulated slag containing sublimated sulfur and ammonium sulfate in the washing tower is reduced.

[0033] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference may be made to the description in other embodiments.

[0034] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. The slag accumulation is disposed of by using a rotary kiln body oxygen supply device, comprising a rotary kiln body, wherein the rotary kiln body comprises a cylinder (1) and a refractory layer (2), wherein the refractory layer (2) is laid on the cylinder (1), and is characterized in that: An oxygen supply device is added in the middle of the rotary kiln body, and the joint of the cylinder (1) is connected via the oxygen supply device; The oxygen supply device comprises a connecting sleeve (3), an inner neck tube (4), refractory bricks (5), an air outlet (11) and an oxygen-enhancing fan (10); the connecting sleeve (3) is fixed to the cylinder (1) by bolts; the connecting sleeve (3) is provided with an inner neck tube (4) extending into the cylinder (1); refractory bricks (5) are built inside the inner neck tube (4); a gap between the connecting sleeve (3) and the inner neck tube (4) is an air chamber (7); an air outlet (11) is left between the refractory layer (2) and the refractory bricks (5) when building; and an oxygen-enhancing fan (10) for adding oxygen into the air chamber (7) is installed outside the connecting sleeve (3).

2. The slag accumulation treatment according to claim 1 utilizes a rotary kiln body oxygen supply device, characterized in that: The rotary kiln body has an inclination angle of 4° to 5°, the inner neck tube (4) is in the shape of a truncated cone, the inner neck tube (4) and the rotary kiln body maintain a coaxial axis, and the refractory bricks (5) inside the inner neck tube (4) have an inclination angle of 2° or more with the horizontal line.

3. The slag accumulation treatment according to claim 1 or 2 utilizes a rotary kiln body oxygen supply device, characterized in that: The refractory bricks (5) are wedge-shaped, and the refractory bricks (5) are laid in a truncated cone shape, extending into the interior of the refractory layer (2). The distance that the refractory bricks (5) are laid into the interior of the refractory layer (2) is 1m-2m.

4. The slag accumulation treatment according to claim 1 utilizes a rotary kiln body oxygen supply device, characterized in that: A support arm (6) is provided between the connecting sleeve (3) and the inner neck tube (4).

5. The slag accumulation treatment method according to claim 1 utilizes a rotary kiln body oxygen supply device, characterized in that: The oxygen-enriching fan (10) is connected to the air chamber (7) via a pipeline, and a remotely controllable air valve (9) is provided on the pipeline.

6. The slag accumulation treatment method according to claim 5 utilizes a rotary kiln body oxygen supply device, characterized in that: The number of the pipes is multiple and they are distributed in an annular manner at equal distances outside the connecting sleeve (3). A brush ring (8) is arranged outside the pipe. The stationary part of the brush ring (8) is connected and fixed to the carrier, and the rotating part is fixed outside the pipe.

Images