Kitchen waste anaerobic sludge deep dewatering treatment device

Abstract

The utility model provides a kind of kitchen garbage anaerobic biogas residue depth dewatering treatment device, belong to kitchen garbage processing technical field, its structure includes biogas residue mechanical dewatering unit, biogas residue drying unit, heat pump energy supply unit and cold circulating water unit, the biogas residue mechanical dewatering unit is fed with conveying belt between biogas residue drying unit, it is connected between biogas residue drying unit, heat pump energy supply unit and cold circulating water unit by multiple circulating air pipe, it is connected between heat pump energy supply unit and cold circulating water unit by multiple cold circulating water pipe, the equipment uses steam-driven heat pump drying process, fully utilizes the steam resource of kitchen garbage processing plant itself, avoids the purchase cost of additional energy equipment, simultaneously, heat pump energy supply unit and cold circulating water unit are connected by the synergistic cooperation of efficient energy conversion and utilization, significantly reduce the energy consumption expenditure in drying process, compared with traditional electric heating drying mode, can effectively save operating cost.

Description

Technical Field

[0001] This utility model relates to a device for deep dewatering of anaerobic digestate residue from kitchen waste, belonging to the field of kitchen waste treatment technology. Background Technology

[0002] Currently, various technologies and methods have been developed in the field of biogas residue dewatering, mainly including traditional mechanical dewatering and natural drying. Mechanical dewatering usually uses equipment such as centrifuges and plate and frame filter presses to remove some of the water from the biogas residue through mechanical force. However, this method can only achieve preliminary dewatering and is difficult to achieve deep dewatering.

[0003] Furthermore, mechanical dewatering equipment has high energy consumption and operating costs, and its adaptability to biogas residue is limited, making it difficult to process materials with high moisture content. Natural drying utilizes solar energy or natural wind to evaporate moisture from biogas residue. Although the cost is lower, it is greatly affected by weather conditions, has low dewatering efficiency, and requires a large area, making it unsuitable for large-scale application. Other technologies, such as thermal drying, can achieve deep dewatering, but their energy consumption is extremely high, resulting in poor economic feasibility.

[0004] Therefore, existing biogas residue dewatering technologies generally suffer from problems such as low efficiency, high energy consumption, and narrow applicability, making it difficult to meet the actual needs of food waste treatment plants. In response to the above shortcomings, this utility model proposes a deep dewatering treatment device for anaerobic biogas residue of food waste. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a deep dewatering treatment device for anaerobic digester residue of kitchen waste to solve the existing problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a deep dewatering treatment device for anaerobic digestate of kitchen waste, the structure of which includes a mechanical dewatering unit for digestate, a drying unit for digestate, a heat pump power supply unit, and a cold circulating water unit. The mechanical dewatering unit and the drying unit for digestate are fed by a conveyor belt. The drying unit, the heat pump power supply unit, and the cold circulating water unit are connected by multiple circulating air ducts. The heat pump power supply unit and the cold circulating water unit are connected by multiple cold circulating water pipes. A steam pipe is connected to the front end of the heat pump power supply unit, and the other end of the steam pipe is connected to an external kitchen waste treatment plant.

[0007] A further improvement is that the biogas residue mechanical dewatering unit is composed of a biogas residue temporary storage tank, a biogas residue conveying system and a mechanical dewatering machine. The biogas residue conveying system is a screw conveying pump, and the mechanical dewatering machine is one of a centrifugal dewatering machine, a screw press dewatering machine or a belt filter press.

[0008] A further improvement is that the biogas residue drying unit includes a biogas residue drying chamber, a dried biogas residue conveying system, and a biogas residue silo. The dried biogas residue conveying system is used to transport the dried biogas residue from the biogas residue drying chamber to the biogas residue silo. The dried biogas residue conveying system adopts a scraper conveyor.

[0009] A further improvement is that the heat pump power supply unit includes a generator, a condenser, a heater, an absorber, an evaporator, and a regenerator. A steam pipe connects the generator and the condenser, a steam pipe connects the absorber and the evaporator, a condensate pipe connects the condenser and the evaporator, multiple hot circulating water pipes connect the condenser, the heater, and the absorber, and a circulating pump is connected to one of the hot circulating water pipes between the absorber and the condenser. Multiple circulating air ducts connect the heater, the biogas residue drying chamber, and the regenerator, and a fan is connected to one of the circulating air ducts between the biogas residue drying chamber and the regenerator.

[0010] A further improvement is that the cold circulating water unit includes a cooler, a heat exchanger, and a cooling tower. Multiple cold circulating water pipes are connected between the cooler, the heat exchanger, and the cooling tower. A cold circulating water pump is connected to one of the cold circulating water pipes between the cooling tower and the heat exchanger. Multiple circulating air ducts are connected between the regenerator and the cooler. Multiple cold circulating water pipes are connected between the evaporator, the cooler, and the heat exchanger.

[0011] A further improvement is that the conveyor belt, screw pump, centrifugal dewatering machine, screw press dewatering machine, belt filter press, scraper conveyor, generator, condenser, heater, absorber, evaporator, regenerator, cooler, heat exchanger and cooling tower are all existing equipment, and their structures and functions will not be described in detail here.

[0012] A further improvement is that a lithium bromide-water solution medium is added to the hot circulating water pipe.

[0013] A further improvement is that the generator, condenser, absorber, evaporator, hot circulating water pipe, steam pipe, condensate pipe, and circulating pump are combined to form an absorption heat exchanger unit.

[0014] The beneficial effects of the utility model are: This utility model provides a deep dewatering treatment device for anaerobic digester residue of food waste. Through the combined design of a digester residue mechanical dewatering unit, a digester residue drying unit, a heat pump power supply unit, and a cold circulating water unit, this device constitutes a deep dewatering treatment device for anaerobic digester residue of food waste. This equipment utilizes a steam-driven heat pump drying process, fully leveraging the abundant steam resources of the food waste treatment plant and avoiding the purchase cost of additional energy equipment. Simultaneously, the efficient energy conversion and utilization between the heat pump power supply unit and the cold circulating water unit significantly reduces energy consumption during the drying process. Compared to traditional electric heating drying methods, it effectively saves operating costs. Furthermore, compared to traditional natural drying methods, this device effectively avoids the influence of weather conditions, has a small footprint, high dewatering efficiency, and no odor pollution risk. In addition, the design of the cold circulating water unit effectively maintains the system temperature balance of the heat pump power supply unit, reducing the failure rate caused by overheating and thus significantly reducing maintenance costs. Attached Figure Description

[0015] Figure 1 This is a process flow diagram of a deep dewatering treatment device for anaerobic digester residue of kitchen waste according to the present invention; Figure 2 This is a flowchart of the biogas residue mechanical dewatering unit of this utility model; Figure 3 This is a flowchart of the biogas residue drying unit of this utility model; Figure 4 This is a flowchart of the heat pump power supply unit and the cold circulating water unit of this utility model. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] Please see Figure 1-4 The present invention discloses a schematic diagram of a deep dewatering treatment device for anaerobic digester residue of kitchen waste. The device comprises a mechanical dewatering unit, a drying unit, a heat pump power supply unit, and a cold circulating water unit. The mechanical dewatering unit and the drying unit are fed by a conveyor belt. The drying unit, the heat pump power supply unit, and the cold circulating water unit are connected by multiple circulating air pipes 19. The heat pump power supply unit and the cold circulating water unit are connected by multiple cold circulating water pipes 17. A steam pipe 18 is connected to the front end of the heat pump power supply unit, and the other end of the steam pipe 18 is connected to an external kitchen waste treatment plant.

[0018] The biogas residue mechanical dewatering unit is composed of a biogas residue temporary storage tank 1, a biogas residue conveying system 2, and a mechanical dewatering machine 3. The biogas residue conveying system 2 is a screw conveying pump, and the mechanical dewatering machine 3 is one of a centrifugal dewatering machine, a screw press dewatering machine, or a belt filter press.

[0019] The biogas residue drying unit includes a biogas residue drying chamber 4, a dried biogas residue conveying system 5, and a biogas residue silo 6. The dried biogas residue conveying system 5 is used to convey the dried biogas residue in the biogas residue drying chamber 4 to the biogas residue silo 6. The dried biogas residue conveying system 5 adopts a scraper conveyor.

[0020] The heat pump power supply unit includes a generator 7, a condenser 8, a heater 9, an absorber 10, an evaporator 11, and a regenerator 12. A steam pipe 18 connects the generator 7 and the condenser 8, a steam pipe 18 connects the absorber 10 and the evaporator 11, a condensate pipe 20 connects the condenser 8 and the evaporator 11, multiple hot circulating water pipes 16 connect the condenser 8, the heater 9, and the absorber 10, and a circulating pump 21 is connected to one of the hot circulating water pipes 16 between the absorber 10 and the condenser 8. Multiple circulating air ducts 19 connect the heater 9, the biogas residue drying chamber 4, and the regenerator 12, and a fan 23 is connected to one of the circulating air ducts 19 between the biogas residue drying chamber 4 and the regenerator 12.

[0021] The cold circulating water unit includes a cooler 13, a heat exchanger 14, and a cooling tower 15. Multiple cold circulating water pipes 17 are connected between the cooler 13, the heat exchanger 14, and the cooling tower 15. A cold circulating water pump 22 is connected to one of the cold circulating water pipes 17 between the cooling tower 15 and the heat exchanger 14. Multiple circulating air ducts 19 are connected between the regenerator 12 and the cooler 13. Multiple cold circulating water pipes 17 are connected between the evaporator 11, the cooler 13, and the heat exchanger 14.

[0022] Working principle: First, the biogas residue in the temporary storage tank 1 is transported to the mechanical dewatering machine 3 by a screw conveyor pump for dewatering. The biogas residue after dewatering on the mechanical dewatering machine 3 is then transported to the biogas residue drying chamber 4 by a conveyor belt for heat conversion-assisted drying by a heat pump power supply unit and a cold circulating water unit. Then, the biogas residue after deep dewatering and drying in the biogas residue drying chamber 4 is transported to the biogas residue silo 6 for storage by a scraper conveyor.

[0023] The heat conversion method of the heat pump power supply unit and the cold circulating water unit first involves an absorption heat exchanger unit, composed of a generator 7, condenser 8, absorber 10, evaporator 11, hot circulating water pipe 16, steam pipe 18, condensate pipe 20, and circulating pump 21, extracting excess steam from the food waste treatment plant. This steam undergoes internal circulation heat exchange within the absorption heat exchanger unit, resulting in circulating air. This circulating air is then heated by the heater 9 on the absorption heat exchanger unit to reach a temperature of 70-75°C. The heat exchange principle of the absorption heat exchanger unit is existing technology and will not be elaborated upon here. The high-temperature circulating air is then introduced into the biogas residue drying chamber 4. The circulating air containing the biogas residue is drawn by the fan 23 on the circulating air duct 19 and circulates between the biogas residue drying chamber 4, heater 9, regenerator 12, and cooler 13, where it is repeatedly heated, cooled, and dehumidified. In addition, the cooling circulating water in the cold circulating water pipe 17 flows into the cooler 13 to cool and dehumidify the circulating air, and then splits into two streams that flow into the evaporator 11 and the heat exchanger 14 respectively. After the two streams of cooling circulating water are cooled, they merge and flow back into the cooler 13 to cool the circulating air. Excess heat is discharged by the cooling circulating water through the cooling tower 15. The above-mentioned intermediate medium of hot circulating air and cold circulating water works together to remove the moisture from the biogas residue in the biogas residue drying chamber 4, thereby drying and dehydrating the biogas residue.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for deep dewatering of anaerobic digestate residue from kitchen waste, characterized in that: Its structure includes a biogas residue mechanical dewatering unit, a biogas residue drying unit, a heat pump power supply unit, and a cold circulating water unit. The biogas residue mechanical dewatering unit and the biogas residue drying unit are fed by a conveyor belt. The biogas residue drying unit, the heat pump power supply unit, and the cold circulating water unit are connected by multiple circulating air ducts. The heat pump power supply unit and the cold circulating water unit are connected by multiple cold circulating water pipes. A steam pipe is connected to the front end of the heat pump power supply unit, and the other end of the steam pipe is connected to an external food waste treatment plant.

2. The deep dewatering device for anaerobic digester residue of kitchen waste according to claim 1, characterized in that: The biogas residue mechanical dewatering unit consists of a biogas residue temporary storage tank, a biogas residue conveying system, and a mechanical dewatering machine. The biogas residue conveying system is a screw conveying pump, and the mechanical dewatering machine is one of a centrifugal dewatering machine, a screw press dewatering machine, or a belt filter press.

3. The deep dewatering device for anaerobic digester residue of kitchen waste according to claim 2, characterized in that: The biogas residue drying unit includes a biogas residue drying chamber, a dried biogas residue conveying system, and a biogas residue silo. The dried biogas residue conveying system is used to transport the dried biogas residue from the biogas residue drying chamber to the biogas residue silo. The dried biogas residue conveying system adopts a scraper conveyor.

4. The deep dewatering device for anaerobic digester residue of kitchen waste according to claim 3, characterized in that: The heat pump power supply unit includes a generator, a condenser, a heater, an absorber, an evaporator, and a regenerator. A steam pipe connects the generator and the condenser, a steam pipe connects the absorber and the evaporator, a condensate pipe connects the condenser and the evaporator, multiple hot circulating water pipes connect the condenser, the heater, and the absorber, and a circulating pump is connected to one of the hot circulating water pipes between the absorber and the condenser. Multiple circulating air ducts connect the heater, the biogas residue drying chamber, and the regenerator, and a fan is connected to one of the circulating air ducts between the biogas residue drying chamber and the regenerator.

5. The deep dewatering device for anaerobic digester residue of kitchen waste according to claim 4, characterized in that: The cold circulating water unit includes a cooler, a heat exchanger, and a cooling tower. Multiple cold circulating water pipes are connected between the cooler, the heat exchanger, and the cooling tower. A cold circulating water pump is connected to one of the cold circulating water pipes between the cooling tower and the heat exchanger. Multiple circulating air ducts are connected between the regenerator and the cooler. Multiple cold circulating water pipes are connected between the evaporator, the cooler, and the heat exchanger.

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