Description
Key words: sludge dryer domestic sludge dryer sludge drying sludge treatment sludge drying production line sludge paddle dryer paddle dryer hollow blade dryer
Classification: slime engineering industry
Case overview: sludge dryer is a kind of sludge dryer, which uses the wedge-shaped hollow paddle and the inner wall heat conduction principle of cylinder equipment, to indirectly heat the sludge produced by industrial wastewater and this kind of sludge between paste or slurry, so as to achieve dehydration and drying of printing and dyeing sludge or sewage treatment sludge, reduce the volume, and then comprehensive utilization, turn waste into treasure, and avoid secondary pollution It is an ideal drying method for sludge treatment at present
The development of sludge treatment in China is relatively late, which mainly has the following problems: the technical facilities for sludge treatment are backward; the investment in sludge treatment and disposal is low; the level of sludge treatment design and management is low, and the sludge treatment status is complex. Generally speaking, the level of sludge treatment is low, and there is a lack of special planning. The traditional treatment methods are mainly used in China's sewage treatment plants, with high investment and high energy consumption. The main problems encountered are: there are many microorganisms in the sludge, which leads to the difficulty of mechanical dewatering; the organic matter in the sludge is solid, so it is difficult to use biodegradation.
Many sewage treatment plants of chemical enterprises will dump the sludge after belt filter press outside the plant, which pollutes the surrounding environment. Now, the state explicitly forbids the sludge to be poured outside. Therefore, enterprises need to dry the sludge and burn it or make bricks for the building materials factory. Therefore, sludge drying will become an engineering project with great potential in the future. The hollow paddle dryer developed by our company is especially suitable for sludge drying. It has been widely used in many enterprises at home and abroad and achieved good treatment effect.
Brief introduction of domestic sludge drying and dewatering equipment:
Pre sludge treatment is an ideal drying equipment.
Working principle of domestic sludge drying and dewatering equipment:
Its structure is that wedge-shaped hollow blades are densely arranged on the hollow shaft, and the heat transfer area per unit effective volume is large. The hot medium can be steam, heat transfer oil and other carriers, and the service temperature is 18-230 ℃. Since the sludge from domestic water treatment or printing and dyeing wastewater is paste or slurry, the wedge-shaped blade heat transfer surface is adopted in the design of sludge dryer. The continuous relative movement between paste or slurry sludge and wedge-shaped blade surface produces a scouring effect. Therefore, the wedge-shaped heat transfer surface of equipment has good self-cleaning function whether the sludge is granular, powdery, paste or slurry. In addition to the wedge-shaped hollow paddle drive shaft, the shell of the sludge dryer is circular at the bottom and rectangular at the upper part. There are 2-4 hollow mixing shafts arranged in the shell, and there is a sealing end cover between the shaft and the shell. The upper cover can prevent the material dust from leaking out and collect the wet steam at the same time. In order to ensure the drying effect, the material level baffle is set at the outlet to ensure the material level height, so that the heat transfer surface is covered by materials and the heat transfer effect is fully exerted. The heat transfer medium (steam or heat transfer oil) of the dryer enters the dense hollow blades on the shaft through the rotary joint at the shaft end, and the shell jacket and the hollow shaft heat the material at the same time.
Classification: slime engineering industry
Case overview: sludge dryer is a kind of sludge dryer, which uses the wedge-shaped hollow paddle and the inner wall heat conduction principle of cylinder equipment, to indirectly heat the sludge produced by industrial wastewater and this kind of sludge between paste or slurry, so as to achieve dehydration and drying of printing and dyeing sludge or sewage treatment sludge, reduce the volume, and then comprehensive utilization, turn waste into treasure, and avoid secondary pollution It is an ideal drying method for sludge treatment at present
The development of sludge treatment in China is relatively late, which mainly has the following problems: the technical facilities for sludge treatment are backward; the investment in sludge treatment and disposal is low; the level of sludge treatment design and management is low, and the sludge treatment status is complex. Generally speaking, the level of sludge treatment is low, and there is a lack of special planning. The traditional treatment methods are mainly used in China's sewage treatment plants, with high investment and high energy consumption. The main problems encountered are: there are many microorganisms in the sludge, which leads to the difficulty of mechanical dewatering; the organic matter in the sludge is solid, so it is difficult to use biodegradation.
Many sewage treatment plants of chemical enterprises will dump the sludge after belt filter press outside the plant, which pollutes the surrounding environment. Now, the state explicitly forbids the sludge to be poured outside. Therefore, enterprises need to dry the sludge and burn it or make bricks for the building materials factory. Therefore, sludge drying will become an engineering project with great potential in the future. The hollow paddle dryer developed by our company is especially suitable for sludge drying. It has been widely used in many enterprises at home and abroad and achieved good treatment effect.
Brief introduction of domestic sludge drying and dewatering equipment:
Pre sludge treatment is an ideal drying equipment.
Working principle of domestic sludge drying and dewatering equipment:
Its structure is that wedge-shaped hollow blades are densely arranged on the hollow shaft, and the heat transfer area per unit effective volume is large. The hot medium can be steam, heat transfer oil and other carriers, and the service temperature is 18-230 ℃. Since the sludge from domestic water treatment or printing and dyeing wastewater is paste or slurry, the wedge-shaped blade heat transfer surface is adopted in the design of sludge dryer. The continuous relative movement between paste or slurry sludge and wedge-shaped blade surface produces a scouring effect. Therefore, the wedge-shaped heat transfer surface of equipment has good self-cleaning function whether the sludge is granular, powdery, paste or slurry. In addition to the wedge-shaped hollow paddle drive shaft, the shell of the sludge dryer is circular at the bottom and rectangular at the upper part. There are 2-4 hollow mixing shafts arranged in the shell, and there is a sealing end cover between the shaft and the shell. The upper cover can prevent the material dust from leaking out and collect the wet steam at the same time. In order to ensure the drying effect, the material level baffle is set at the outlet to ensure the material level height, so that the heat transfer surface is covered by materials and the heat transfer effect is fully exerted. The heat transfer medium (steam or heat transfer oil) of the dryer enters the dense hollow blades on the shaft through the rotary joint at the shaft end, and the shell jacket and the hollow shaft heat the material at the same time.
The evaporated water is taken out of the dryer by the tail gas, filtered by the bag filter, and the dried fine powder is recovered. The wet air is discharged out of the room by the induced draft fan after water dedusting.
Characteristics of domestic sludge drying and dewatering equipment:
1. Low energy consumption of pulp leaf dryer: due to indirect heating, there is no large amount of air to take away heat, and the outer wall of the dryer is provided with insulation layer, so 1.2kg steam is needed to evaporate 1kg water for slurry materials.
2. The cost of the pulp dryer system is low: the unit effective volume has a huge heat transfer surface, which shortens the processing time and reduces the equipment size. It greatly reduces the building area and building space.
3. A wide range of materials processing: the use of different media, not only can deal with heat sensitive materials, but also can deal with high temperature materials. Common media are: steam, thermal oil, hot water, cooling water, etc. It can be operated continuously or intermittently, and can be used in many fields.
4. Low environmental pollution: little air carried, little dust carried. Closed circuit circulation can be used for contaminated materials or solvent recovery.
5. Low operating cost: the equipment operates normally, only 1 person / day. Low speed stirring and reasonable structure. The wear is small and the maintenance cost is very low.
Stable operation: due to the special compression expansion mixing effect of wedge-shaped blade, the material particle composition contacts with the heat transfer surface. In the axial range, the temperature, humidity and mixing temperature gradient of the material are very small, thus ensuring the stability of the process.
Enough heating time can effectively eliminate virus and bacteria, and meet the requirements of environmental protection standards.
The solid content of the dried sludge is high (^ up to 90%).
Technical parameters of sludge dryer (case study)
The moisture content of sludge before drying is more than 80-86%.
The moisture content after drying is about 10-15%.
Volume change: the volume decreases by 4 to 5 times after drying.
Output: 10-20 tons / day, sludge containing more than 80% moisture. About 0.13 tons of dry sludge powder and some 5 mm small particles can be produced after drying each ton of sludge.
The low calorific value of dried sludge powder is about 1300 to 1500 kcal.
Steam consumption.
Power consumption 15kw / h
Machine body specification: 6500 × 2000 × 1800 (L × w × h)
Changzhou Haomai drying Engineering Co., Ltd. attaches importance to talents and scientific and technological innovation, continuously develops advanced sludge dryers with high efficiency, easy operation and control, and strives to provide customers with mature and satisfactory products. In order to make the design scheme more operational, the company also has a variety of test prototypes for customers to obtain various practical data for material test.
