At present, with the popularization of urban sewage treatment facilities in China, the improvement of treatment rate and the deepening of treatment, the amount of sludge discharged from sewage treatment plants is increasing. The continuous increase in the amount of municipal sludge emissions has also made the terminal disposal of municipal sludge a problem that needs to be solved urgently.
Zaozhuang China United Cement Co., Ltd. in the actual production, the use of new dry process cement production technology to implement the use of sludge, achieved a good environmental protection effect, for urban sludge reduction, stabilization, harmlessness, Resource-based, low-cost final disposal provides an entirely new model, broadening the road for urban environmental optimization and the promotion of circular economy.
Sludge Treatment Status Urban sludge is the waste generated after the sewage treatment plant treats urban sewage. After physical dehydration, it forms an offensive, brown or black, soft solid with a specific gravity slightly larger than that of water, containing a large amount of organic matter. Abundant nutrients such as nitrogen and phosphorus, heavy metals, pathogenic bacteria, and pathogenic bacteria can cause serious environmental pollution if they are discharged without treatment. How to properly accomplish sludge terminal disposal and truly achieve waste reduction, resource, and harmless targets has become an urgent task for city managers and has received more attention from people.
Because the sludge has a high water content after dehydration and is accompanied by an offensive odor, the sewage treatment plant generally adopts disposal methods such as agricultural utilization, landfill, incineration, and evacuation into the sea. Sludge has less investment in agriculture, low energy consumption, and low operating costs. However, the loss of heavy metals, pathogens, refractory organics, and nitrogen and phosphorus cannot be ignored for surface and groundwater pollution. Sanitary landfill operations are relatively simple and have a low investment cost. The treatment cost is low and the applicability is strong. However, the land occupied is very serious and it is difficult to find a suitable site. If the impermeable technology is not mature enough, it will lead to potential soil pollution and groundwater pollution. Moreover, landfill disposal cannot ultimately avoid environmental pollution, but only delays the time for environmental pollution. Sludge incineration is one of the most thorough sludge treatment methods. It can completely carbonize organic substances, kill pathogens, and minimize pollution. Mud volume, but complex processing facilities, high energy consumption, large investment, processing costs, and organic matter incineration will produce two-f British and other substances, harm the environment.
In order to realize the terminal treatment of urban sludge, in 2007, under the support of the municipal party committee and government of Zaozhuang City, Zaozhuang China United Cement Co., Ltd. and Zaozhuang Municipal Wastewater Treatment Plant successfully carried out the sewage treatment plant sludge terminal treatment project cooperation. There are 6 existing sewage treatment plants in Zaozhuang City, Shandong Province, and the daily production of sludge is more than 200 tons. Zaozhuang Zhonglian Cement Co., Ltd. uses advanced new dry process cement production technology and equipment to batch, dry and grind the organic calorific value and inorganic components in the sludge, and then produces high-quality clinker and cement. Good economic and environmental effects.
The main technical indicators Zaozhuang China United Cement Co., Ltd. now has 3 new dry process cement production lines. The entire logistics process enters the mill system from the raw material blending station and the coal storage yard, and all the calcined clinker in the rotary kiln is in a closed circulation state. During the production process, the air flow is in a state of negative pressure, and all the dust points are equipped with domestic advanced dust collection. facility. The temperature in the rotary kiln is always maintained at 1400-1800°C, the kiln decomposing furnace temperature is around 850°C, and the five-stage suspension preheater is between 350-880°C. The large amount of hot air produced by cooling the clinker is used to generate electricity and raw materials. Drying, the part is out of the row, the temperature of 120 ~ 300 °C outside the use of hot air, add some drying equipment. Zaozhuang Zhonglian Cement Co., Ltd. possesses the conditions required for sludge treatment, which will not result in major changes in the control process of the cement process, and does not require major improvements to the system equipment.
In terms of processing capacity, due to the large heat capacity in large-scale cement production, the quantity and quality of incoming materials are allowed to fluctuate moderately, and therefore minor changes in the composition caused by the addition of waste can be accommodated, and the use of waste is much larger. The processing capacity of existing professional processing equipment. The daily processing capacity of the pollution is more than 50 tons, and the liquid phase appears during the formation of cement minerals. Therefore, after the waste is used, the incineration residue can be absorbed or solid-melted by the cement mineral, so that there is no problem of disposal of the residue.
Sludge physicochemical properties Municipal sludge is an active substance formed from various wastes after biochemical reaction. Its moisture content is high, about 60% to 75%. The components and calorific value follow the source of sludge. Different and there is a big difference. The inorganic components of sludge are basically similar to clay minerals, while the low calorific value (dry basis) of sludge treated by Zaozhuang Zhonglian Cement Co., Ltd. is approximately 8000 kJ/kg.
For sludge with high moisture content, low yield, and difficulty in continuous drying alone, when the sludge is put into the silo, closed treatment is used to keep the silo in a state of negative pressure at all times, thereby preventing the silo from being contained in the silo. Odor leaks. On the basis of not affecting the normal production and operation of the existing production line, the waste heat of the rotary kiln exhaust is used to dry instead of the raw material, ie, the bituminous coal blended mill is used as a low-volume fuel or is directly used as the inferior fuel to be stably stabilized by the head-end pulverized coal weigher. Feeding into the calciner and kiln, the dried sludge after feeding is decomposed by the high-temperature combustion at 900°C and above 1700°C respectively, thus avoiding the low temperature generation of SiO 2 . The exhaust gas of the rotary kiln is tracked by on-line environmental monitoring equipment and determined to reach the atmosphere after reaching the standard, effectively eliminating possible dust and secondary pollution.
The clinker produced by the inspection of the indicators, no abnormal composition, physical and chemical indicators qualified. Through the disposal and utilization in the past year, it can be confirmed that it is feasible that the urban sludge is harmlessly disposed in the production of new dry process cement. The treatment of sludge is combined with the production of cement. The sludge is sent to the calciner and calcined together with the material. The drying and calcining of the sludge is carried out in a closed calciner until it becomes part of the cement clinker component.
Urban sludge contains a certain amount of heat, which can be directly fed into the kiln for combustion, thus saving fuel. The new dry process cement production line has the advantages of high treatment process temperature, long treatment time, high operation rate, and harmless discharge of dust exhaust gas, and can completely treat sludge in a harmless manner.
The use of high-temperature, sterilized incineration to treat garbage is not only the most hygienic treatment, but also reduces the volume of sludge by incineration, making it easier to handle the final treatment. At the same time, the energy generated when the waste is burned can be used as a heat source for other processes, contributing to saving energy. Through the combination with the new cement kiln system, the coal consumption is reduced and the energy saving goal is achieved. At the same time, the ash produced by it can be used as a cement raw material to increase the production capacity of cement clinker.
Zaozhuang China United Cement Co., Ltd. in the actual production, the use of new dry process cement production technology to implement the use of sludge, achieved a good environmental protection effect, for urban sludge reduction, stabilization, harmlessness, Resource-based, low-cost final disposal provides an entirely new model, broadening the road for urban environmental optimization and the promotion of circular economy.
Sludge Treatment Status Urban sludge is the waste generated after the sewage treatment plant treats urban sewage. After physical dehydration, it forms an offensive, brown or black, soft solid with a specific gravity slightly larger than that of water, containing a large amount of organic matter. Abundant nutrients such as nitrogen and phosphorus, heavy metals, pathogenic bacteria, and pathogenic bacteria can cause serious environmental pollution if they are discharged without treatment. How to properly accomplish sludge terminal disposal and truly achieve waste reduction, resource, and harmless targets has become an urgent task for city managers and has received more attention from people.
Because the sludge has a high water content after dehydration and is accompanied by an offensive odor, the sewage treatment plant generally adopts disposal methods such as agricultural utilization, landfill, incineration, and evacuation into the sea. Sludge has less investment in agriculture, low energy consumption, and low operating costs. However, the loss of heavy metals, pathogens, refractory organics, and nitrogen and phosphorus cannot be ignored for surface and groundwater pollution. Sanitary landfill operations are relatively simple and have a low investment cost. The treatment cost is low and the applicability is strong. However, the land occupied is very serious and it is difficult to find a suitable site. If the impermeable technology is not mature enough, it will lead to potential soil pollution and groundwater pollution. Moreover, landfill disposal cannot ultimately avoid environmental pollution, but only delays the time for environmental pollution. Sludge incineration is one of the most thorough sludge treatment methods. It can completely carbonize organic substances, kill pathogens, and minimize pollution. Mud volume, but complex processing facilities, high energy consumption, large investment, processing costs, and organic matter incineration will produce two-f British and other substances, harm the environment.
In order to realize the terminal treatment of urban sludge, in 2007, under the support of the municipal party committee and government of Zaozhuang City, Zaozhuang China United Cement Co., Ltd. and Zaozhuang Municipal Wastewater Treatment Plant successfully carried out the sewage treatment plant sludge terminal treatment project cooperation. There are 6 existing sewage treatment plants in Zaozhuang City, Shandong Province, and the daily production of sludge is more than 200 tons. Zaozhuang Zhonglian Cement Co., Ltd. uses advanced new dry process cement production technology and equipment to batch, dry and grind the organic calorific value and inorganic components in the sludge, and then produces high-quality clinker and cement. Good economic and environmental effects.
The main technical indicators Zaozhuang China United Cement Co., Ltd. now has 3 new dry process cement production lines. The entire logistics process enters the mill system from the raw material blending station and the coal storage yard, and all the calcined clinker in the rotary kiln is in a closed circulation state. During the production process, the air flow is in a state of negative pressure, and all the dust points are equipped with domestic advanced dust collection. facility. The temperature in the rotary kiln is always maintained at 1400-1800°C, the kiln decomposing furnace temperature is around 850°C, and the five-stage suspension preheater is between 350-880°C. The large amount of hot air produced by cooling the clinker is used to generate electricity and raw materials. Drying, the part is out of the row, the temperature of 120 ~ 300 °C outside the use of hot air, add some drying equipment. Zaozhuang Zhonglian Cement Co., Ltd. possesses the conditions required for sludge treatment, which will not result in major changes in the control process of the cement process, and does not require major improvements to the system equipment.
In terms of processing capacity, due to the large heat capacity in large-scale cement production, the quantity and quality of incoming materials are allowed to fluctuate moderately, and therefore minor changes in the composition caused by the addition of waste can be accommodated, and the use of waste is much larger. The processing capacity of existing professional processing equipment. The daily processing capacity of the pollution is more than 50 tons, and the liquid phase appears during the formation of cement minerals. Therefore, after the waste is used, the incineration residue can be absorbed or solid-melted by the cement mineral, so that there is no problem of disposal of the residue.
Sludge physicochemical properties Municipal sludge is an active substance formed from various wastes after biochemical reaction. Its moisture content is high, about 60% to 75%. The components and calorific value follow the source of sludge. Different and there is a big difference. The inorganic components of sludge are basically similar to clay minerals, while the low calorific value (dry basis) of sludge treated by Zaozhuang Zhonglian Cement Co., Ltd. is approximately 8000 kJ/kg.
For sludge with high moisture content, low yield, and difficulty in continuous drying alone, when the sludge is put into the silo, closed treatment is used to keep the silo in a state of negative pressure at all times, thereby preventing the silo from being contained in the silo. Odor leaks. On the basis of not affecting the normal production and operation of the existing production line, the waste heat of the rotary kiln exhaust is used to dry instead of the raw material, ie, the bituminous coal blended mill is used as a low-volume fuel or is directly used as the inferior fuel to be stably stabilized by the head-end pulverized coal weigher. Feeding into the calciner and kiln, the dried sludge after feeding is decomposed by the high-temperature combustion at 900°C and above 1700°C respectively, thus avoiding the low temperature generation of SiO 2 . The exhaust gas of the rotary kiln is tracked by on-line environmental monitoring equipment and determined to reach the atmosphere after reaching the standard, effectively eliminating possible dust and secondary pollution.
The clinker produced by the inspection of the indicators, no abnormal composition, physical and chemical indicators qualified. Through the disposal and utilization in the past year, it can be confirmed that it is feasible that the urban sludge is harmlessly disposed in the production of new dry process cement. The treatment of sludge is combined with the production of cement. The sludge is sent to the calciner and calcined together with the material. The drying and calcining of the sludge is carried out in a closed calciner until it becomes part of the cement clinker component.
Urban sludge contains a certain amount of heat, which can be directly fed into the kiln for combustion, thus saving fuel. The new dry process cement production line has the advantages of high treatment process temperature, long treatment time, high operation rate, and harmless discharge of dust exhaust gas, and can completely treat sludge in a harmless manner.
The use of high-temperature, sterilized incineration to treat garbage is not only the most hygienic treatment, but also reduces the volume of sludge by incineration, making it easier to handle the final treatment. At the same time, the energy generated when the waste is burned can be used as a heat source for other processes, contributing to saving energy. Through the combination with the new cement kiln system, the coal consumption is reduced and the energy saving goal is achieved. At the same time, the ash produced by it can be used as a cement raw material to increase the production capacity of cement clinker.
The feeding and unloading device of machine tool is the automatic or semi automatic mechanical device which takes the workpiece to be sent to the machine tool and the workpiece is removed from the machining position, also known as the automatic loading and unloading device.
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Trip |
1300*2500*280 |
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Platform size |
1380×2750mm |
|
accuracy |
The machining accuracy is 0.02, and the repeated positioning accuracy is 0.05mm |
|
The structure of X, y and Z |
Z screw, x, y rack
|
|
Maximum blank line speed |
50000mm/min |
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Maximum operating speed |
25000mm/min |
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Spindle power |
9.0kw |
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Guide |
25 way rail |
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Spindle speed |
0-24000r/min |
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Operation mode |
servo |
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working voltage |
AC380V/50HzAC380V/60Hz |
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Operation instruction |
G code |
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operating system |
SYNTEC system |
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Net weight |
2000kg |
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