Energy-saving grease recovery system

Abstract

The utility model discloses an energy-saving grease recovery system which comprises a garbage receiving hopper, the garbage receiving hopper is connected with a slurrying machine, a slurry pump is arranged behind the slurrying machine, the slurrying machine is connected with a buffer tank through the slurry pump, a sand removing pump is arranged behind the buffer tank, the buffer tank is connected with sand and impurity removing equipment through the sand removing pump, and a heat exchange pump is arranged behind the sand and impurity removing equipment. The sand and impurity removal equipment is connected with the waste heat recovery equipment through a heat exchange pump, a hydrothermal pump is arranged behind the waste heat recovery equipment, automatic valves are arranged at the bottoms of the garbage receiving hopper, the pulping machine and the buffer tank, the waste heat recovery equipment is connected with grease separation equipment through the hydrothermal pump, and the waste heat recovery equipment is connected with the garbage receiving hopper, the pulping machine and the buffer tank through the automatic valves. According to the invention, the high-temperature slurry waste heat generated by the grease separation unit is fully utilized to preheat and secondarily heat the front-end material, so that the energy consumption of grease recovery steam is greatly saved, and the cooling energy consumption and the cooling equipment investment of a tail-end anaerobic fermentation system are further saved.

Description

Technical Field

[0001] The utility model relates to the field of grease recovery and treatment of kitchen waste and kitchen waste, and in particular to an energy-saving grease recovery system. Background Art

[0002] With the continuous improvement of the level of domestic waste classification, the scale of catering waste and kitchen waste treatment is getting larger and larger, and the resource utilization rate is getting higher and higher, especially the recycling of waste grease in catering waste and kitchen waste, which is an important means of resource utilization.

[0003] At present, the mainstream process for recycling waste oil from restaurant kitchen and kitchen waste is "pretreatment + high-temperature cooking + three-phase centrifugation", and most of the end-stages are equipped with medium-temperature anaerobic fermentation to produce biogas. Specifically, after the garbage is collected, the restaurant kitchen and kitchen waste enter the pretreatment system for pulping, including mechanical pulping, hydraulic pulping and other processes. The pulping slurry is subjected to high-temperature cooking, which is mainly achieved by direct steam injection or indirect heat exchange. After cooking, it enters the three-phase centrifuge, and the oil is recovered by centrifugation. The solid residue after centrifugation is transported out for disposal, and the high-temperature organic slurry after centrifugation is sent to the end-stage medium-temperature anaerobic fermentation system for biogas production. This process is mature and reliable, but there are two main problems: high-temperature cooking consumes a lot of steam, and the high-temperature slurry generated by three-phase centrifugation has a temperature of up to 70~85℃, and the energy is not utilized; in addition, the high-temperature slurry entering the end anaerobic fermentation system also needs to be set up with a heat exchanger and a cooling tower for cooling, which increases the project investment and operating costs.

[0004] There are few invention patents for energy-saving grease recovery systems related to the field of restaurant waste and kitchen waste treatment at home and abroad. The Chinese utility model "A restaurant waste grease recovery system" discloses a restaurant waste grease recovery system, including a waste gas grease collection pool, a grease preheating tank, a centrifuge, a steam source, etc., but there is no description related to energy saving, no waste heat recovery unit or preheating unit is designed, and the process energy consumption is relatively high. Utility Model Content

[0005] In view of the above technical problems in the related art, the utility model provides an energy-saving grease recovery system, which can solve the above problems.

[0006] In order to achieve the above technical purpose, the technical solution of the utility model is implemented as follows:

[0007] An energy-saving grease recovery system, characterized in that it includes a garbage receiving hopper, a hopper preheating automatic valve is arranged at the bottom of the garbage receiving hopper, the garbage receiving hopper is connected to a pulping machine, a pulping machine preheating automatic valve is arranged at the bottom of the pulping machine, a slurry pump is arranged behind the pulping machine, the pulping machine is connected to a cache tank through the slurry pump, a cache tank preheating automatic valve is arranged at the bottom of the cache tank, a desanding pump is arranged behind the cache tank, the cache tank is connected to a desanding and impurity removal device through the desanding pump, a heat exchange pump is arranged behind the desanding and impurity removal device, the desanding and impurity removal device is connected to a waste heat recovery device through the heat exchange pump, a hot liquid pump is arranged behind the waste heat recovery device, the waste heat recovery device is connected to a grease separation device through the hot liquid pump, the waste heat recovery device is connected to the garbage receiving hopper through the hopper preheating automatic valve, the waste heat recovery device is connected to the pulping machine through the pulping machine preheating automatic valve, and the waste heat recovery device is connected to the cache tank through the cache tank preheating automatic valve.

[0008] Furthermore, the garbage receiving hopper, the pulping machine, and the buffer tank are all provided with external coils on their outer walls.

[0009] Furthermore, the garbage receiving hopper, the pulping machine, and the buffer tank are all provided with temperature sensors and liquid level sensors.

[0010] Furthermore, the waste heat recovery equipment adopts a spiral plate heat exchanger.

[0011] The beneficial effects of the utility model are as follows: the utility model fully utilizes the waste heat of the high-temperature slurry generated by the oil separation unit to preheat and reheat the front-end materials, which greatly saves the energy consumption of oil recovery steam, and further saves the cooling energy consumption and cooling equipment investment of the terminal anaerobic fermentation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] The utility model is further described in detail below with reference to the accompanying drawings.

[0014] Figure 1 It is a work flow chart of an energy-saving grease recovery system described in an embodiment of the utility model;

[0015] In the figure:

[0016] 1. Garbage receiving hopper; 2. Pulping machine; 3. Slurry pump; 4. Buffer tank; 5. Desanding pump; 6. Desanding and impurity removal equipment; 7. Heat exchange pump; 8. Waste heat recovery equipment; 9. Hot liquid pump; 10. Grease separation equipment; 11. Hopper preheating automatic valve; 12. Pulping machine preheating automatic valve; 13. Buffer tank preheating automatic valve. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0018] like Figure 1 As shown, according to the utility model, an energy-saving grease recovery system is disclosed, including a garbage receiving hopper 1, a hopper preheating automatic valve 11 is arranged at the bottom of the garbage receiving hopper 1, the garbage receiving hopper 1 is connected to a pulping machine 2, a pulping machine preheating automatic valve 12 is arranged at the bottom of the pulping machine 2, a slurry pump 3 is arranged behind the pulping machine 2, the pulping machine 2 is connected to a buffer tank 4 through the slurry pump 3, a buffer tank preheating automatic valve 13 is arranged at the bottom of the buffer tank 4, a desanding pump 5 is arranged behind the buffer tank 4, and the buffer tank 4 is connected to a desanding and impurity removal pump 5 through the desanding pump 5 Equipment 6, a heat exchange pump 7 is arranged behind the desanding and impurity removal equipment 6, the desanding and impurity removal equipment is connected to a waste heat recovery equipment 8 through the heat exchange pump 7, a hot liquid pump 9 is arranged behind the waste heat recovery equipment 8, the waste heat recovery equipment 8 is connected to a grease separation equipment 10 through the hot liquid pump 9, the waste heat recovery equipment 8 is connected to the garbage receiving hopper 1 through the hopper preheating automatic valve 11, the waste heat recovery equipment 8 is connected to the pulping machine 2 through the pulping machine preheating automatic valve 12, and the waste heat recovery equipment 8 is connected to the cache tank 4 through the cache tank preheating automatic valve 13;

[0019] In one embodiment of the utility model, the garbage receiving hopper 1, the pulping machine 2, and the buffer tank 4 are all provided with external coils on the outer walls, the garbage receiving hopper 1, the pulping machine 2, and the buffer tank 4 are all provided with temperature sensors and liquid level sensors, and the waste heat recovery device 8 adopts a spiral plate heat exchanger;

[0020] In one embodiment of the present invention, taking 100 tons / day of food waste as an example, the specific energy-saving grease recovery method and system are described as follows:

[0021] The kitchen waste is unloaded from the collection truck to the garbage receiving hopper 1, and is transported to the pulping machine 2 for pulping through the conveying screw of the hopper. After pulping, the residue is separated and transported out. The organic slurry is transported to the buffer tank 4 through the slurry pump 3. After homogenization and buffering, it is transported to the impurity removal and sand removal equipment 6 by the sand removal pump 5 for sand removal and impurity removal. After impurity removal, the slurry is transported to the waste heat recovery equipment 8 by the heat exchange pump 7. After heat exchange, the slurry enters the grease separation equipment 10. The grease separation equipment includes a heating tank and a three-phase centrifuge. After separation, the oil is recovered and the residue is transported out for disposal. The hot liquid is pumped by the hot liquid pump 9 to the waste heat recovery equipment 8 for heat exchange with the slurry after sand and impurities are removed. The hot liquid after heat exchange can be preheated to the garbage receiving hopper 1, the pulping machine 2, and the buffer tank 4 respectively through the hopper preheating automatic valve 11, the pulping machine preheating automatic valve 12, and the buffer tank preheating automatic valve 13, and is automatically controlled by the temperature sensor and the liquid level sensor to further recover the hot liquid energy. The slurry after heat exchange is sent to the subsequent anaerobic fermentation system.

[0022] In one embodiment of the utility model, the temperature of the food waste is about 20°C, the operating temperature of the grease separation is 80°C, and if the energy-saving grease recovery method and system of the present invention are not used, 100 tons / day of food waste requires about 10 tons / day of steam for heating. After using the energy-saving grease recovery method and system disclosed in the present invention, the steam consumption can be reduced to 6 tons / day, saving 40% of steam energy consumption; in addition, after heat exchange, the organic slurry entering the anaerobic fermentation system is reduced from 80°C to about 55°C, which can save 200kW of cooling energy consumption.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving grease recovery system, characterized in that: The invention comprises a garbage receiving hopper (1), wherein a hopper preheating automatic valve (11) is arranged at the bottom of the garbage receiving hopper (1), the garbage receiving hopper (1) is connected to a pulping machine (2), a pulping machine preheating automatic valve (12) is arranged at the bottom of the pulping machine (2), a slurry pump (3) is arranged behind the pulping machine (2), the pulping machine (2) is connected to a buffer tank (4) through the slurry pump (3), a buffer tank preheating automatic valve (13) is arranged at the bottom of the buffer tank (4), a desanding pump (5) is arranged behind the buffer tank (4), the buffer tank (4) is connected to a desanding and impurity removal device (6) through the desanding pump (5), and the desanding and impurity removal device (6) is provided with a heat exchange pump (7), the sand and impurity removal equipment is connected to a waste heat recovery equipment (8) through the heat exchange pump (7), a hot liquid pump (9) is provided behind the waste heat recovery equipment (8), the waste heat recovery equipment (8) is connected to a grease separation equipment (10) through the hot liquid pump (9), the waste heat recovery equipment (8) is connected to the garbage receiving hopper (1) through the hopper preheating automatic valve (11), the waste heat recovery equipment (8) is connected to the pulping machine (2) through the pulping machine preheating automatic valve (12), and the waste heat recovery equipment (8) is connected to the cache tank (4) through the cache tank preheating automatic valve (13).

2. An energy-saving grease recovery system according to claim 1, characterized in that: The garbage receiving hopper (1), the pulping machine (2), and the buffer tank (4) are all provided with external coils on their outer walls.

3. An energy-saving grease recovery system according to claim 1, characterized in that: The garbage receiving hopper (1), the pulping machine (2), and the buffer tank (4) are all provided with temperature sensors and liquid level sensors.

4. An energy-saving grease recovery system according to claim 1, characterized in that: The waste heat recovery device (8) adopts a spiral plate heat exchanger.

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