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Solar energygeothermal drying sludge technologycomplete set of equipment

2021-05-28 11:22:03


At present, we are accelerating the construction of a resource-saving and environment-friendly society, promoting the development of the national economy under the guidance of the scientific outlook on development, and a pattern of energy conservation and emission reduction led by the government, dominated by enterprises and jointly promoted by the whole society is taking shape. The promotion of energy conservation and emission reduction has become the focus of promoting the healthy development of circular economy.


With the popularization of sewage treatment facilities and the improvement of treatment rate in China, the amount of sludge will reach 30 million tons / day. Due to the complex composition of sludge, if untreated sludge is not properly disposed, stacking and discharging untreated sludge everywhere will pose a great threat to the human environment. The cost of sludge treatment and disposal mainly includes on-site transmission cost, off-site transportation cost and landfill cost, and the most important factor affecting the cost is the amount of sludge.


The implementation of the project will make effective use of sludge, realize its resource utilization while achieving harmless treatment of sludge, and have considerable economic benefits and good social driving benefits.


1. Greenhouse system

The greenhouse system consists of the main body of the greenhouse, ventilation system, heating circulation system, internal and external weather stations and computer control system. The main frame of the main sunlight plate greenhouse is hot-dip galvanized steel pipe and steel plate, the top of the greenhouse is special aluminum profile, and the fan is used in the north and south of the ventilation system. It can be automatically turned on according to indoor and outdoor temperature, humidity and sunlight illumination parameters. The temperature sensor of internal and external weather stations adopts Japanese tokyo-100, with a resolution of 0.1 ℃. The humidity sensor adopts humier-15 tubular structure of American humier company, which is not affected by water condensation. At the same time, it adopts solid polymer patented technology, which has self-protection against greenhouse H2S, NH3 and other gas pollution, with a resolution of 0.5%. The wind speed and direction sensor adopts Davis 7911 of American company and adopts special engineering plastics, which has excellent anti ultraviolet aging effect. The light sensor adopts American Davis full spectrum light sensor, with the spectral range of 200-1100nm The computer system adopts the chipset with industrial single chip microcomputer of Intel company as the core. Reliable performance. Realize remote control through communication.


2. Geothermal system
Ground source heat pump is a new energy utilization technology that uses shallow ground energy for heating and cooling. It is a kind of heat pump. Heat pump is a device that uses the principle of Carnot cycle and reverse Carnot cycle to transfer cooling and heat Ground source heat pump (GSHP) is usually used to transfer the heat or cooling capacity of underground soil to the required place Heat pumps are usually used for air conditioning, refrigeration or heating Ground source heat pump also makes use of the huge heat and cold storage capacity of underground soil. Ground source transfers heat from underground soil to buildings. At present, heat pumps are mainly used in energy-saving buildings, industrial low-temperature water and so on. As the site is located in the water plant, it is recommended to use reclaimed water after sewage treatment as the water source without cost.


3. Wet sludge conveying system

The sludge is transported to the sludge bin for storage, and the sludge in the bin is transported to the silo of the sludge paver through screw conveyor or belt conveyor or sludge pump. The sludge conveying volume is controlled by PLC, and the number or time of pressing action is controlled. The whole set of sludge system realizes automatic control and adjusts the conveying volume in the centralized control room to realize centralized control.


4. Long rack type sludge paver, dumper and gas monitoring system

It is composed of spanning paver, tipping machine, screw feeder, gas detector and industrial monitoring system. The full-automatic paving and throwing machine is driven by a long rack, and the frequency conversion motor automatically adjusts the mud turning speed, so that the sludge can be turned evenly, so that the surface can be renovated and evaporated. At the same time, it also plays the role of oxygen supply, so as to avoid the release of malodorous gas due to local anaerobic sludge. In order to ensure the continuity of blanking, the vibrator is selected for the silo and works regularly. The gas monitoring system has H2S and NH3 detectors, which output 4-20 mA signals and are connected to the remote control system through the communication module. The video monitoring of the industrial monitoring system adopts digital infrared camera to monitor the monitoring points in real time, and has the function of hard disk video recording.


5. Automatic control system

The automatic control system of sludge drying adopts the basic control mode of configuration software + PLC. The upper computer realizes the monitoring and control of each equipment through communication with PLC and intelligent instrument. PLC can operate independently through internal program. The upper computer adopts Taiwan Advantech ipc610h industrial computer, and the production process route can be simulated and displayed on the computer interface. The process parameter point data can be displayed, adjusted and set on the computer interface, and enter the program. The process operation parameters can be randomly retrieved and printed, and the fault monitoring can realize the instantaneous recording and alarm function of fault point, fault type and occurrence time. An intelligent watt hour meter is configured to record the energy consumption data of the drying process in real time and convert the drying cost.


6. Dry material collection equipment

The sludge is dried under the action of paving and throwing machine, solar energy and reclaimed water geothermal as heat source. The dried sludge is transported to the dry material warehouse through belt conveyor, which has small floor area and flexible use.

The dried sludge can be recycled: first, the mixture of sludge (about 50%) and shale or coal gangue is used to burn environmental protection bricks, which have the characteristics of thermal insulation, heat insulation, light weight and convenient transportation; Second, it can be used as fuel. When each kilogram of dry sludge is burned, it will produce 2000-3000 calories of heat, and 2.5kg of dry sludge is equivalent to the heat generated by 1kg of standard coal. Third, it can be used as a source of organic fertilizer. Municipal sludge is rich in organic matter, with the content of 55% and the content of nitrogen, phosphorus and potassium reaching 10%, all of which meet the national requirements for the efficiency of organic fertilizer.


The biggest features are: high efficiency, energy saving, environmental protection, safety, economy and reliability.