Sludge hammer flow drying apparatus
The sludge hammer airflow drying equipment, which combines a hammer disperser and a hot airflow, solves the problems of uneven sludge drying and high energy consumption, achieves rapid and uniform sludge drying, reduces energy consumption and equipment footprint, and expands the scope of application.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PINGYI COUNTY HENGXIN MASCH EQUIP CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-23
AI Technical Summary
Existing sludge drying technologies suffer from uneven drying, high energy consumption, large equipment footprint, and high costs. In particular, they cannot effectively treat flowing wet sludge, which limits their application scope.
The sludge is dispersed into small particles by combining a hammer disperser with a hot air stream and dried evenly in the hot air stream. The waste heat of the sintering brick kiln is used as a heat source. The hammer disperser and conveying pipeline design achieve efficient dispersion and drying of sludge. The gas sludge particle separation chamber is combined to improve separation efficiency.
It enables rapid and uniform drying of sludge, reduces energy consumption and equipment footprint, improves production efficiency and drying quality, and expands the scope of application.
Smart Images
Figure CN224394759U_ABST
Abstract
Description
Technical Field
[0001] This invention proposes a sludge hammer airflow drying device, which is particularly suitable for the drying treatment of urban domestic sludge. Background Technology
[0002] Industrial and urban sewage, after being mechanically dewatered (such as by plate and frame filter press), becomes wet sludge with a water content of 80%. This sludge is soft and can be kneaded by hand. After drying, it becomes relatively dry sludge with a water content of 20%, which is considered qualified dried sludge and can be used to make bricks and other building materials.
[0003] Sludge can be used to make bricks, making use of waste, turning fertilizer into treasure, reducing environmental pollution, and benefiting society. It will receive government advocacy and encouragement. Sludge with a moisture content of 20% after drying is the best raw material for making bricks.
[0004] Common sewage sludge drying processes are as follows:
[0005] The sludge is first dehydrated by mechanical pressure. Commonly used equipment includes belt filter presses and centrifugal dewatering machines. The advantages are low energy consumption and simple operation. After mechanical pressure dewatering, it becomes wet sludge. Although the sludge is concentrated, the water content is still relatively high at 80%, and it cannot be directly used for mechanical brick making. It needs to be further dried.
[0006] Natural drying utilizes solar and wind energy to evaporate moisture naturally. Its advantages are low cost and simple operation, while its disadvantages are that it is greatly affected by the weather, has a long drying time, and requires a large area.
[0007] Thermal drying involves evaporating moisture through heating. Commonly used equipment includes rotary drum dryers and fluidized bed dryers. Its advantages are fast drying speed and high efficiency, but its disadvantages are high energy consumption and large equipment investment.
[0008] The most popular method in the domestic market is the mobile drying method for wet mud. This method requires the construction of a tunnel kiln. Before drying, the wet mud is divided into blocks and then placed on a conveyor belt for mobile drying inside the tunnel kiln.
[0009] The drawbacks of this mobile drying method include: the overall length of the kiln to be dried is too long, and the kiln volume is too large, requiring a large production area and space. The sludge being dried is uneven in size due to its varying lumps, with some large lumps not dried properly and some small lumps over-dried. Furthermore, some lumps are dried well on the surface but not in the center, and the side in contact with the heat source dries while the side away from the heat source dries poorly, resulting in uneven drying and inconsistent moisture content. This affects the quality of subsequent brick making. Moreover, this drying equipment is inefficient, increases drying time, raises production costs, and reduces production output. It also cannot dry flowing, more water-rich wet sludge, limiting the range of wet sludge that can be dried.
[0010] If the sludge is dispersed into uniform particles, the volume of the sludge particles becomes smaller and the specific surface area of the sludge increases. When the sludge particles are placed in a moving hot air stream for heating, the huge surface area of the sludge particles can quickly absorb heat energy and thus be dried uniformly. The moving hot air stream can also carry away the moisture from the dried sludge in time. This allows the sludge to be dried quickly and uniformly, improving the quality and efficiency of sludge drying. How to achieve the drying of granulated sludge in a hot air stream is the problem that this utility model needs to solve. Summary of the Invention
[0011] This utility model proposes a novel sludge hammer jet dryer, comprising a hammer disperser, a sludge raw material silo, a sludge raw material belt conveyor, a sludge feed inlet, a hot air source, a gas-sludge particle separation chamber, and a conveying pipeline. Its key feature is that the sludge raw material is dispersed and dried into a sludge particle mixture within the hammer disperser. Both the sludge raw material inlet and the dried sludge particle outlet of the hammer disperser are located at the top of the hammer disperser. The two ends at the top of the hammer disperser are directly connected to the sludge input conveying pipeline and the dried sludge particle outlet pipeline. The sludge raw material and hot air flow downwards into the hammer disperser through the conveying pipeline, while the dispersed and dried sludge particles move upwards out of the hammer disperser through the conveying pipeline connected to the sludge particle outlet.
[0012] The sludge hammer airflow drying equipment of this utility model is characterized in that the sludge and hot air flow move downward in the conveying pipe and enter the hammer disperser. The input direction of the sludge is consistent with the rotation direction of the hammer head of the hammer disperser, so that the hammer head of the hammer disperser can effectively disperse the sludge.
[0013] This utility model discloses a sludge hammer-type airflow drying device, characterized in that sludge is dispersed into small particles and uniformly dried under the combined action of hot airflow and the rotating hammerhead of a hammer disperser. Hot airflow alone cannot disperse sludge into small particles because using only hot airflow for drying and dispersion causes the sludge surface to dehydrate and solidify rapidly, while the center dries later, resulting in uneven drying—the surface is dry while the center is wet—making it difficult to disperse the sludge into small particles. A simple disperser also cannot disperse sludge into small particles. Wet sludge contains 80% moisture; after being dispersed and broken up by the disperser, it will re-aggregate. Therefore, a simple disperser cannot disperse sludge into small particles without the presence of hot airflow. Similarly, a disperser and ambient temperature airflow are ineffective for dispersing sludge.
[0014] This utility model proposes a sludge hammer-type airflow drying device, characterized in that the dispersed and dried sludge particles move upward with the hot airflow and leave the hammer disperser. After the sludge and hot airflow enter the hammer disperser downwards, the rotating hammers break up and disperse the sludge. The hot airflow dries and mixes the dispersed sludge, and together they move upwards from the sludge output pipe of the hammer disperser. Due to the centrifugal force of the rotating hammers, some large, undispersed sludge particles move upwards in the sludge output pipe. As the height increases, the force of the rotating hammers gradually decreases and disappears. When the weight of the large sludge particles exceeds the upward pushing force of the hot airflow in the pipe, they move downwards back into the hammer disperser to be dispersed and dried again. Only the small particles that have been properly dispersed and dried, whose own weight is less than the upward pushing force of the hot airflow, can move upwards with the hot airflow in the conveying pipe and leave the hammer disperser. Therefore, the sludge dispersed by the hammer disperser moves upward and leaves the hammer disperser, which can effectively improve the efficiency of sludge drying and dispersion.
[0015] After the sludge exits the hammer disperser, the height at which the sludge particles move upward in the conveying pipe is the control height for the moisture content of the sludge after dispersion and drying, which is the height to ensure the quality of sludge drying. The temperature of the hot air stream coming out of the disperser is greater than 100 degrees Celsius. As the sludge moves upward in the output pipe, it is continuously heated and dried. If the output pipe gradually widens upward, the inner diameter of the pipe increases, and the cross-sectional area inside the pipe gradually increases, the upward speed of the dispersed sludge particles slows down, increasing the effective drying time of the sludge.
[0016] This utility model relates to a hammer jet dryer for sludge, characterized in that the dispersed and dried sludge particles move downwards with the hot airflow into a gaseous sludge particle separation chamber. The gaseous sludge particle separation chamber has a large volume, and the speed of the hot airflow slows down upon entry. Under the influence of gravity, the sludge particles move downwards, while the hot airflow and steam move upwards, achieving efficient separation between the hot airflow and the sludge particles.
[0017] The dispersed and dried sludge particles move downward through a curved conveyor pipe and enter the gas sludge particle separation chamber. Compared to entering the separation chamber horizontally, the path for sludge to separate from the hot air flow is shorter. That is, as the sludge moves downward into the gas sludge particle separation chamber, the distance the sludge travels within the chamber is shorter. This not only improves the separation efficiency of sludge and hot air flow but also relatively reduces the length and volume of the gas sludge particle separation chamber, increasing the compactness of the equipment and reducing space waste.
[0018] This utility model relates to a hammer mill airflow drying device for sludge, characterized by utilizing the waste heat from a brick kiln for heating the sludge. After the dried sludge granules are sintered in the kiln, the waste heat from the sintering process is used as the source of the hot airflow for drying the sludge. The dried sludge granules, after being processed into bricks, still contain moisture and must undergo further sintering in the kiln to acquire strength and become qualified machine-made building bricks. The waste heat discharged after brick firing is approximately 300 degrees Celsius, which, when used as the hot air source for drying the sludge granules, not only reduces brick-making costs and energy consumption but also protects the environment. Attached Figure Description
[0019] Figure 1 This is a simplified process diagram of the sludge hammer airflow drying equipment of this utility model.
[0020] Figure 2 Front sectional view of the internal components of a hammer disperser for sludge.
[0021] Figure 3 Top view of the internal components of a hammer disperser for sludge.
[0022] In the attached diagram: 1-Sludge raw material silo; 2-Sludge raw material belt conveyor; 3-Sludge feed port.
[0023] 4-Airlock feeder; 5-Conveying pipeline; 6-Hot air source; 7-Air valve; 8-Hammer disperser
[0024] 9-Dried sludge granule bin; 10-Dried sludge belt conveyor; 11-Gas sludge granule separation chamber
[0025] 12 Gas handling chamber; 13 Exhaust pipe; 14 Hammer disperser hammer; 15 Rotary disc of hammer disperser.
[0026] 16 - Hammer disperser central shaft; 17 - Hammer disperser disc connecting rod. Detailed Implementation
[0027] Figure 1 This is a schematic diagram of the sludge hammer airflow drying equipment of this utility model:
[0028] Hot air enters the conveying pipe 5 through the hot air source 6 and the air valve 7. It moves downward in the conveying pipe 5 and enters the hammer disperser 8. Sludge is conveyed from the sludge raw material silo 1 through the sludge raw material belt conveyor 2 and enters the sludge feed port 3. It is then fed into the conveying pipe 5 through the airlock feeder 4. Under its own gravity, the sludge descends along the sludge conveying pipe 5 and enters the hammer disperser 8 to be dispersed.
[0029] The function of the airlock feeder 4 is to input the sludge in the sludge feed port 3 into the conveying pipe 5. The hot air in the conveying pipe 5 cannot enter the sludge feed bin 3 and then enter the atmosphere through the airlock feeder 4. That is, the air in the conveying pipe 5 cannot overflow through the airlock feeder 4, but the sludge in the sludge feed port 3 can be input into the conveying pipe 5 through the airlock feeder.
[0030] In the hammer disperser 8, the rotating disk 15 of the hammer disperser is fixed on the central shaft 16 of the hammer disperser, and the central shaft 16 of the hammer disperser is fixed on the outer shell of the hammer disperser 8. The rotating disk 15 of the hammer disperser is fixedly connected together by the connecting rod 17 of the hammer disperser. The hammer head 14 of the hammer disperser is connected to the connecting rod 17 of the hammer disperser, and the circumferential direction of the rotation of the hammer head 14 is consistent with the feeding direction of the sludge.
[0031] After the wet sludge is fed into the hammer disperser 8 through the conveying pipe 5, it is continuously dispersed under the circumferential rotation force of the hammer head 14. With the combined action of the hot air flow, the sludge is dispersed, dried and mixed into uniform dry sludge particles. Then, it moves upward from the outlet end of the hammer disperser 8 along the output pipe, and then moves downward along the horizontal or circumferential pipe into the gas sludge particle separation chamber 11. The downward movement of the dried sludge particles into the gas sludge particle separation chamber 11 improves the separation effect between the sludge particles and the hot air flow. Compared with the horizontal entry of sludge particles into the gas sludge particle separation chamber, the downward movement of sludge particles and separation from the air directly reduces the area and volume of the gas sludge particle separation chamber 11, which allows for a more compact layout of the production equipment and reduces the production land area.
[0032] The dry sludge particles deposited at the bottom of the gas-sludge particle separation chamber 11 are transported to the dry sludge particle silo 9 by the dry sludge belt conveyor 10 for storage and later use as raw materials for brick making. Hot air enters the gas treatment chamber 12 from the gas-sludge particle separation chamber 11, and after purification, it is discharged into the natural atmosphere through the exhaust pipe 13.
Claims
1. A sludge hammer airflow drying equipment, comprising a hammer disperser, a sludge raw material bin, a sludge raw material belt conveyor, a sludge feeding port, a hot air source, a gas sludge particle separation chamber, a conveying pipeline; characterized in that The sludge raw material is dispersed and dried into a sludge particle mixture in the hammer disperser; the sludge raw material input inlet and the dried sludge particle output outlet of the hammer disperser are both above the hammer disperser; the two ends above the hammer disperser are directly connected with the sludge input conveying pipeline and the dried sludge particle output pipeline; the sludge raw material and the hot air flow move downward from the conveying pipeline into the hammer disperser, and the dispersed and dried sludge particles move upward from the sludge particle output outlet conveying pipeline of the hammer disperser to leave the hammer disperser.
2. A sludge hammer-flow drying apparatus according to claim 1, characterized in that The direction in which the sludge enters the hammer disperser is consistent with the rotation direction of the hammer head of the hammer disperser.
3. A sludge hammer-flow drying apparatus according to claim 1, characterized in that The dispersed and dried sludge particles move downward along with the hot air flow into the gas sludge particle separation chamber.
4. A sludge hammer-flow drying apparatus according to claim 1, characterized in that The hot air flow for heating the sludge uses the waste heat of the sintering brick kiln.