A lime kiln desulfurization sludge drying, crushing and forming device
By utilizing waste heat from the lime kiln and a spiral drying device combined with a pulverizer, the problem of low drying efficiency of desulfurization sludge was solved, achieving efficient drying and pulverization, and reducing coal fuel consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LUOYANG ZHONGJING SHUOFENG MINING CO LTD
- Filing Date
- 2025-07-01
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, the drying efficiency of desulfurization sludge is low, and it is difficult to directly crush and shape it, which leads to an increase in coal powder fuel consumption.
Waste heat from the lime kiln is used as the drying heat source. The desulfurization sludge is dried and pulverized by combining a spiral drying device and a pulverizer, thereby increasing the heat exchange area and residence time.
It improves the drying efficiency and pulverization effect of desulfurization sludge, reduces the consumption of pulverized coal fuel, and saves energy costs.
Smart Images
Figure CN224299096U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of drying, pulverizing and molding sludge from lime kilns, specifically relating to a drying, pulverizing and molding device for desulfurization sludge from lime kilns. Background Technology
[0002] The desulfurization processes for lime kiln flue gas mainly include the limestone-gypsum method, the magnesium oxide method, the ammonia method, and the dual-alkali method. Among these, the limestone-gypsum method primarily produces gypsum as the sludge source, resulting in a large sludge production volume. The magnesium oxide method primarily produces magnesium sulfate / magnesium sulfite as the sludge source, which has high solubility and is less prone to equipment clogging. The ammonia method primarily produces ammonium sulfate as the sludge source. The dual-alkali method primarily produces Na₂SO₃ / Na₂SO₄ as the sludge source. Currently, the solid-liquid separation equipment for desulfurization sludge is the filter press. The filter plates and filter cloth of the filter press achieve solid-liquid separation, and the dewatered sludge forms a blocky sludge cake. In existing technologies, to improve the utilization efficiency of sludge cake, lumpy sludge is dried, then crushed. The crushed sludge (with the proportion of powdered sludge controlled within the range of 10% to 15%) is then mixed into a coal mill for further crushing. The mixture of pulverized coal and powdered sludge is then injected into the lime kiln for combustion via the coal powder distributor and burner. This method reduces coal powder consumption without affecting the calorific value of the pulverized coal, thereby saving on coal energy combustion costs.
[0003] Because the sludge after solid-liquid separation in the filter press is in lumpy form with a moisture content between 18% and 25%, this high moisture content prevents the lumpy desulfurization sludge from being directly crushed into powder. It requires drying to achieve the necessary moisture content for crushing. Currently, hot air is used to dry the desulfurization sludge lumps. For example, patent application number CN201410361593.4, entitled "A Sludge Heat Pump Drying Device," mainly discloses "a sludge heat pump drying device, including a drying box, a sludge carrying belt, and a heating device for heating the sludge carrying belt. The sludge carrying belt is placed in the drying box, and a dry sludge transport trolley is placed below the sludge carrying belt. It also includes a power device for driving the sludge carrying belt to rotate. The sludge carrying belt has multiple evenly distributed accommodating spaces for accommodating sludge. Above the accommodating spaces, there is also a pressing roller for pressing the sludge into the accommodating spaces. The outer circumferential surface of the pressing roller is in contact with the sludge carrying belt. The drying box has a rectangular sludge inlet with a length equal to or greater than the width of the sludge carrying belt. The pressing roller is arranged in the feeding direction of the sludge inlet. Preferably, the pressing roller is arranged as close as possible to the sludge inlet. When the sludge falls onto the sludge carrying belt, it is squeezed by the pressing roller, causing the sludge to be pressed into the accommodating spaces." The main technical problem in the above-mentioned patent application is that the sludge needs to be dried by hot air from a heating device in the sludge carrying space, and at the same time, it needs to be pressed by a pressing roller. The heat exchange area between the hot air and the sludge is small, resulting in low drying efficiency. Based on the above-mentioned technical defects in the prior art, the inventor has developed a drying, crushing and forming device for desulfurization sludge in lime kilns, which can effectively solve the above-mentioned technical problems in the prior art. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a drying, crushing, and molding device for desulfurization sludge from lime kilns. The structure of this utility model is scientifically and rationally designed and simple. This utility model uses the waste heat air from the lime kiln as the drying heat source. The waste heat from the lime kiln is introduced into the drying cylinder by an exhaust fan to form a drying circulation field for drying desulfurization sludge cakes. The spiral drying device not only realizes the sliding conveying of the desulfurization sludge cakes, but also increases the residence time of the desulfurization sludge cakes in the drying cylinder and increases the heat interaction area between the waste heat air and the sludge cakes. At the same time, a crusher is used to crush the dried desulfurization sludge cakes to reach the feed particle size range required by the coal mill.
[0005] The technical solution adopted in this utility model is as follows: a drying, pulverizing, and molding device for desulfurization sludge from a lime kiln, comprising a support column, a support plate, and a drying cylinder. The support column is vertically fixed at the bottom of the support plate, and a fixing disc is fixed at the bottom of the support column, which is fixed to the ground by screws. The drying cylinder is fixedly installed at the center of the support plate. The drying cylinder is a hollow cylinder, with an upper cover fixedly installed at the top and a lower cover fixedly installed at the bottom. The upper and lower covers are concentric with the drying cylinder. A hopper is fixedly installed on the left front side of the upper cover. The hopper extends through the upper cover to the lower part of the upper cover; the upper waste heat air pipe is fixedly installed on the upper right side of the upper cover, extending through the upper cover to the inside of the drying cylinder; the lower waste heat air pipe is fixedly installed on the lower left side of the lower cover, extending through the lower cover to the inside of the drying cylinder; the spiral drying device is fixedly installed in the center of the inside of the drying cylinder, with the upper part of the spiral drying device fixed to the center of the upper cover and the lower part of the spiral drying device fixed to the center of the lower cover; the discharge hopper is fixedly installed on the right rear side of the lower cover, and the crusher is fixedly installed in the corresponding lower part of the discharge hopper.
[0006] The support plate includes a support ring, which is circular, and fixed blocks, which are fan-shaped. The fixed blocks are fixed at equal angles around the outer circumferential surface of the support ring. A support column is vertically fixed at the bottom of each fixed block.
[0007] The outer end of the upper waste heat duct is fixedly connected to the inlet of the exhaust fan via a connecting duct, and the outer end of the lower waste heat duct is fixedly connected to the waste heat collection pipe of the lime kiln via a connecting duct.
[0008] The spiral drying device includes a central column, the upper part of which is fixed to the center of the upper cover, and the lower part of which is fixed to the center of the lower cover; the spiral drying rack is a spiral arc shape, and the spiral drying rack is continuously and uninterruptedly arranged around the circumference of the central column from bottom to top; the rotating drums are fixedly arranged between the spiral drying racks, and the rotating drums are evenly spaced from the bottom to the top of the spiral drying racks.
[0009] The rotating drum includes a rotating shaft, one end of which is fixed to the outer inner side of the spiral drying rack, and the other end is fixed to the inner outer side of the spiral drying rack; bearings are symmetrically fixed at both ends of the drum, and the inner rings of the bearings are mounted on the rotating shaft; the drum is hollow with a smooth transition from a large diameter at both ends to a small diameter in the middle.
[0010] The unloading hopper includes an unloading body, which is a hollow structure with a fan-shaped upper part and a circular lower part. A concave arc-shaped surface is provided on the center surface of the unloading body.
[0011] The lower part of the feeding hopper corresponds to the upper part of the spiral drying rack, and the upper fan-shaped opening of the unloading hopper corresponds to the lower part of the spiral drying rack.
[0012] The pulverizer described is a commonly used pulverizer in the prior art, and those skilled in the art are fully aware of its specific structure and working principle, so it will not be described in too much detail here.
[0013] The working process of this drying, crushing, and molding device for desulfurization sludge from lime kilns is as follows: First, the exhaust fan is turned on. The exhaust fan's suction force draws the waste heat air from the lime kiln's waste heat collection pipe into the drying cylinder through the lower waste heat air pipe. The waste heat air circulates within the drying cylinder via the spiral drying rack of the spiral drying device and is then discharged into the atmosphere through the upper waste heat air pipe back into the exhaust fan. Simultaneously, the crusher is turned on, putting it into operation. When the desulfurization sludge cake formed from the solid-liquid separation in the filter press is conveyed to the discharge hopper by the conveyor belt, the block-shaped desulfurization sludge cake falls from the discharge hopper onto the rotating drum of the spiral drying rack. At this point, the block-shaped desulfurization sludge cake utilizes its own... Under the combined action of gravity and the spiral inclined structure of the spiral drying rack and the rolling action of the rotating drum, the blocky desulfurization sludge cake slowly slides downwards. At the same time, waste heat air passes through the gaps between the rotating drums to dry the blocky desulfurization sludge cake. As the desulfurization sludge cake continues to slide downwards, the waste heat air continues to dry the desulfurization sludge cake. When the blocky desulfurization sludge cake slides down to the position of the discharge hopper, the dried desulfurization sludge cake falls into the feed hopper of the crusher through the discharge hopper. The crusher crushes the dried desulfurization sludge cake to the material particle size required by the coal mill. This completes the drying, crushing and shaping process of desulfurization sludge.
[0014] The beneficial effects of this utility model are as follows: 1. By coordinating the spiral drying device, upper waste heat air duct, lower waste heat air duct, and exhaust fan, the residence time of the desulfurization sludge cake on the spiral drying device is increased, and the heat exchange area between the desulfurization sludge cake and hot air is increased, thereby improving the drying efficiency and effect of the desulfurization sludge cake. 2. By setting up the pulverizer and spiral drying device, the process of drying and pulverizing the blocky desulfurization sludge cake is completed. The pulverized desulfurization sludge is then ground again by the coal mill, reducing the mixing with the coal powder. This reduces the consumption of coal powder fuel in the lime kiln without reducing the calorific value of the coal powder. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This utility model Figure 1 A partial cross-sectional view;
[0017] Figure 3 This is a schematic diagram of the structure of the novel spiral drying device.
[0018] Figure 4 This is a schematic diagram of the structure of the unloading hopper of this utility model;
[0019] Figure 5 This is a schematic diagram of the structure of the roller of this utility model;
[0020] The diagram is marked with the following symbols: 1. Support column, 2. Support plate, 21. Support ring, 22. Fixing block, 3. Drying cylinder, 4. Top cover, 5. Bottom cover, 6. Discharge hopper, 7. Upper waste heat air pipe, 8. Lower waste heat air pipe, 9. Spiral drying device, 91. Central column, 92. Spiral drying rack, 93. Rotating drum, 931. Rotating shaft, 932. Bearing, 933. Drum, 10. Discharge hopper, 101. Discharge hopper body, 102. Arc-shaped surface, 11. Crusher. Detailed Implementation
[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0022] This utility model provides a drying, crushing, and molding device for desulfurization sludge from lime kilns:
[0023] like Figure 1 or Figure 2 As shown, the support column 1 is vertically fixed at the bottom of the support plate 2. A fixed disc is fixed at the bottom of the support column 1 and fixed to the ground by screws. The support plate 2 includes a support ring 21, which is circular. The fixing block 22 is fan-shaped and is fixed at equal angles around the outer side of the support ring 21. The support column 1 is vertically fixed at the bottom of each fixing block 22.
[0024] The aforementioned arrangement of the support column 1, support plate 2, support ring 21, and fixing block 22 provides stable support for the drying cylinder 3 and also provides space for the fixed installation of the crusher 11.
[0025] like Figure 1 or Figure 2 As shown, the drying cylinder 3 is fixedly installed in the center of the support plate 2, and the drying cylinder 3 is a hollow cylindrical shape. The upper cover 4 is fixedly installed on the upper part of the drying cylinder 3, and the lower cover 5 is fixedly installed on the bottom of the drying cylinder 3. The upper cover 4 and the lower cover 5 are concentric with the drying cylinder 3. The upper waste heat air pipe 7 is fixedly installed on the upper right side of the upper cover 4, and extends through the upper cover 4 into the interior of the drying cylinder 3. The lower waste heat air pipe 8 is fixedly installed on the lower left side of the lower cover 5, and extends through the lower cover 5 into the interior of the drying cylinder 3. The above-mentioned arrangement of the drying cylinder 3 provides space for the fixed installation of the spiral drying device 9. On the other hand, the exhaust fan introduces the waste heat of the lime kiln into the drying cylinder, and at the same time, the upper cover 4, the lower cover 5, the upper waste heat air pipe 7, and the lower waste heat air pipe 8 form a drying circulation field for drying desulfurization sludge cake.
[0026] like Figure 1 or Figure 2 As shown, the hopper 6 is fixedly positioned on the left front side of the upper cover 4, extending through the upper cover to the lower part of the upper cover 4; the lower part of the hopper 6 corresponds to the upper part of the spiral drying rack 92. The main purpose of this arrangement is as follows: Firstly, the hopper 6 can be connected to the conveyor to automatically transport the desulfurization sludge from the solid-liquid separation of the filter press to the drying drum 3, achieving continuous feeding of the desulfurization sludge cake; secondly, by utilizing the structural feature of the hopper 6 corresponding to the upper part of the spiral drying rack 92, the desulfurization sludge cake can be accurately fed onto the rotating drum 93 of the spiral drying rack 92.
[0027] like Figure 1 , 2 As shown in Figure 3, the spiral drying device 9 is fixedly installed at the center of the inside of the drying cylinder 3. The upper part of the spiral drying device 9 is fixed to the center of the upper cover 4, and the lower part of the spiral drying device 9 is fixed to the center of the lower cover 5. The spiral drying device 9 includes a central column 91, the upper part of the central column 91 is fixed to the center of the upper cover 4, and the lower part of the central column 91 is fixed to the center of the lower cover 5. The spiral drying rack 92 is a spiral arc shape. The spiral drying rack 92 is continuously and uninterruptedly arranged around the central column 91 from bottom to top. The rotating drums 93 are fixedly installed between the spiral drying racks 92. The rotating drums 93 are evenly arranged at equal intervals from the bottom to the top of the spiral drying racks 92.
[0028] The aforementioned arrangement of the spiral drying device 9, central column 91, spiral drying rack 92, and rotating drum 93 utilizes the self-rotation of the rotating drum 93 on the spiral drying rack 92 and the spiral inclined structure of the spiral drying rack 92. The desulfurized sludge cake is then conveyed from top to bottom on the rotating drum 93 of the spiral drying rack 92 by its own gravity. Under the exchange and drying effect of waste heat air, on the one hand, the heat exchange area of the desulfurized sludge cake is increased, thereby improving the drying efficiency of the desulfurized sludge cake; on the other hand, the residence time of the desulfurized sludge cake on the rotating drum 93 of the spiral drying rack 92 is extended, improving the drying effect of the desulfurized sludge cake.
[0029] like Figure 1 , 2 As shown in Figures 3 and 4, the unloading hopper 10 is fixedly installed on the right rear side of the lower cover 5, and the crusher 11 is fixedly installed on the corresponding lower part of the unloading hopper 10. The unloading hopper 10 includes an unloading body 101, which is a hollow structure with an upper fan shape and a lower circle. The center surface of the unloading body 101 is provided with a concave arc surface 102.
[0030] The above-mentioned design of the unloading hopper 10 and the unloading body 101 as hollow structures with an upper fan shape and a lower circular shape, and the unloading body 101 as an upper fan shape, can be seamlessly matched with the edge structure of the lower cover 5, which increases the maximum contact area between the upper part of the unloading hopper 10 and the lower part of the spiral drying rack 92, so that the dried desulfurization sludge cake can fall smoothly into the feed hopper of the crusher 11 through the unloading hopper 10.
[0031] By opening an arc-shaped surface 102 on the center surface of the unloading body 101, the unloading body 101 and the center column 91 can be well fixed and fitted together.
[0032] like Figure 5 As shown, the rotating drum 93 includes a rotating shaft 931. One end of the rotating shaft 931 is fixed to the outer inner side of the spiral drying rack 92, and the other end is fixed to the inner outer side of the spiral drying rack 92. Bearings 932 are symmetrically fixed at both ends of the drum 933, and the inner ring of the bearings 932 is mounted on the rotating shaft 931. The drum 933 is hollow with a smooth transition from a large diameter at both ends to a small diameter in the middle.
[0033] The aforementioned hollow structure of the roller 933, with a large diameter at both ends and a small diameter in the middle, works in conjunction with the gravity of the desulfurized sludge cake, the spiral inclined structure of the spiral drying rack 92, and the self-rotation of the rotating roller 93. This prevents the desulfurized sludge cake from sliding and shifting, and guides the sliding transport of the desulfurized sludge cake, keeping it in the middle position of the spiral drying rack 92.
[0034] like Figure 1 , 2 As shown in Figure 3, the crusher 11 includes a feed hopper, a frame, a drive motor, crushing blades, and a discharge port for unloading. Since the structure of the crusher 11 does not involve any innovative technological improvements, it is a conventional material crushing device in this field. The crusher 11 is mainly used to crush dried, blocky desulfurization sludge cake to meet the feed particle size requirements of the coal mill.
[0035] like Figure 1-5As shown, the working process of this drying, crushing, and molding device for desulfurized sludge from a lime kiln is as follows: First, the exhaust fan is turned on. The exhaust fan's suction force draws the waste heat air from the lime kiln's waste heat collection pipe into the drying cylinder 3 through the lower waste heat air pipe 8. The waste heat air circulates in the drying cylinder 3 through the spiral drying rack 92 of the spiral drying device 9, and then enters the exhaust fan through the upper waste heat air pipe 7 to be discharged into the atmosphere. At the same time, the crusher 11 is turned on, putting it into operation. When the desulfurized sludge cake formed from the solid-liquid separation in the filter press is conveyed to the feeding hopper 6 by the conveyor belt, the blocky desulfurized sludge cake falls from the feeding hopper 6 onto the rotating drum 93 of the spiral drying rack 92. Using its own gravity, combined with the spiral inclined structure of the spiral drying rack 92 and the rolling action of the rotating drum 93, the blocky desulfurization sludge cake slowly slides downward. At the same time, waste heat air passes through the gaps between the rotating drums 93 to dry the blocky desulfurization sludge cake. As the desulfurization sludge cake slides down continuously, the waste heat air continues to dry the desulfurization sludge cake. When the blocky desulfurization sludge cake slides down to the position of the discharge hopper 10, the dried desulfurization sludge cake falls into the feed hopper of the crusher 11 through the discharge hopper 10. The crusher 11 crushes the dried desulfurization sludge cake to the material particle size required by the coal mill, thus completing the drying, crushing and shaping process of the desulfurization sludge.
[0036] Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A drying, pulverizing, and molding device for desulfurization sludge from a lime kiln, comprising a support column, a support plate, and a drying cylinder, wherein the support column is vertically fixed at the bottom circumferential position of the support plate, and a fixing disc is fixedly mounted at the bottom of the support column, the fixing disc being fixed to the ground by screws; characterized in that: The drying cylinder is fixedly installed in the center of the support plate. The drying cylinder is a hollow cylindrical shape. The upper cover is fixedly installed on the upper part of the drying cylinder, and the lower cover is fixedly installed on the bottom of the drying cylinder. The upper and lower covers are concentric with the drying cylinder. The feeding hopper is fixedly installed on the left front side of the upper cover, and extends through the upper cover to the lower part of the upper cover. The upper waste heat air pipe is fixedly installed on the upper right side of the upper cover, and extends through the upper cover to the inside of the drying cylinder. The lower waste heat air pipe is fixedly installed on the lower left side of the lower cover, and extends through the lower cover to the inside of the drying cylinder. The spiral drying device is fixedly installed in the center of the inside of the drying cylinder. The upper part of the spiral drying device is fixed to the center of the upper cover, and the lower part of the spiral drying device is fixed to the center of the lower cover. The discharge hopper is fixedly installed on the right rear side of the lower cover, and the crusher is fixedly installed in the corresponding lower part of the discharge hopper.
2. The drying, pulverizing, and molding device for desulfurization sludge from a lime kiln according to claim 1, characterized in that: The support plate includes a support ring, which is circular, and fixed blocks, which are fan-shaped. The fixed blocks are fixed at equal angles around the outer circumferential surface of the support ring. A support column is vertically fixed at the bottom of each fixed block.
3. The drying, crushing, and molding device for desulfurization sludge from a lime kiln according to claim 1, characterized in that: The outer end of the upper waste heat duct is fixedly connected to the inlet of the exhaust fan via a connecting duct, and the outer end of the lower waste heat duct is fixedly connected to the waste heat collection pipe of the lime kiln via a connecting duct.
4. The drying, crushing, and molding device for desulfurization sludge from a lime kiln according to claim 1, characterized in that: The spiral drying device includes a central column, the upper part of which is fixed to the center of the upper cover, and the lower part of which is fixed to the center of the lower cover; the spiral drying rack is a spiral arc shape, and the spiral drying rack is continuously and uninterruptedly arranged around the circumference of the central column from bottom to top; the rotating drums are fixedly arranged between the spiral drying racks, and the rotating drums are evenly spaced from the bottom to the top of the spiral drying racks.
5. The drying, crushing, and molding device for desulfurization sludge from a lime kiln according to claim 4, characterized in that: The rotating drum includes a rotating shaft, one end of which is fixed to the outer inner side of the spiral drying rack, and the other end is fixed to the inner outer side of the spiral drying rack; bearings are symmetrically fixed at both ends of the drum, and the inner rings of the bearings are mounted on the rotating shaft; the drum is hollow with a smooth transition from a large diameter at both ends to a small diameter in the middle.
6. The drying, pulverizing, and molding device for desulfurization sludge from a lime kiln according to claim 1, characterized in that: The unloading hopper includes an unloading body, which is a hollow structure with a fan-shaped upper part and a circular lower part. A concave arc-shaped surface is provided on the center surface of the unloading body.
7. The drying, pulverizing, and molding device for desulfurization sludge from a lime kiln according to claim 1, characterized in that: The lower part of the feeding hopper corresponds to the upper part of the spiral drying rack, and the upper fan-shaped opening of the unloading hopper corresponds to the lower part of the spiral drying rack.