Kitchen waste and catering slurry heat balance control system

Abstract

The utility model relates to the technical field of garbage treatment, in particular to a kitchen waste and catering slurry heat balance control system, which is characterized in that a steam input end of a mixing heater is connected with a regulating valve I through a pipeline, and a slurry input end of the mixing heater is connected with a variable-frequency regulating pump I through a pipeline; the output end of the mixing heater is connected with the middle oil extraction treatment system through a pipeline, and the oil extraction treatment system is connected with the double-pipe heat exchanger through a pipeline. The temperature of the oil-extracted slurry is controlled to be lower than 45 DEG C by controlling the cooling circulating water to meet the anaerobic process, so that the efficient oil extraction and the anaerobic process are met at the same time, the heat of the kitchen waste slurry and the heat of the catering slurry are accurately controlled, the oil extraction efficiency is improved, the use amount of circulating water and steam is reduced, and the energy consumption is reduced. And the most economical, most efficient and most balanced control method is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage disposal, in particular to a heat balance control system for kitchen waste and catering slurry. Background Art

[0002] In wet waste treatment, restaurant waste pretreatment generally uses the process of "material reception + bulk separation + crushing, pulping and sorting + sand and impurity removal + three-phase centrifugal oil extraction." Kitchen waste pretreatment generally uses the process of "material reception + coarse crushing + bulk separation + pulping and sorting + sand and impurity removal."

[0003] No slurry oil removal system was installed for kitchen waste. Following the trial operation of the pretreatment system, the system's slurry oil content became uncontrollable. The grease in the wet garbage slurry mixed with kitchen waste caused sludge loss in the anaerobic digestion system, impacted anaerobic reaction efficiency, inhibited the activity of anaerobic bacteria, accelerated foam and scum production, and increased scum production, resulting in a decrease in anaerobic treatment effectiveness and even the inability of the anaerobic digestion system to operate sustainably. Furthermore, the high oil content in the feed and the slow oil degradation rate prevented complete digestion and degradation within the anaerobic tank, resulting in a high oil content and acidification tendency in the effluent from the anaerobic fermentation tank, ultimately causing failure of the wastewater treatment biochemical and membrane components. Grease is also an economical product; extraction can increase the overall project yield and avoid resource waste.

[0004] In addition, since the oil content in kitchen waste slurry is significantly lower than that in restaurant waste and fluctuates, the oil extraction process of restaurant waste cannot be adopted under the conditions of limited space in some pretreatment workshops. This requires oil content analysis of kitchen waste and research on efficient slurry oil extraction processes and systems.

[0005] To achieve efficient oil extraction, simultaneous research on efficient slurry heat exchange technology is also required. This allows for precise control of the overall heat balance of the wet waste slurry, ensuring that the temperature of the slurry delivered to the anaerobic system is kept below 45°C. Steam is used to preheat the food waste slurry before oil extraction, and circulating cooling water is used to cool the slurry delivered to the anaerobic system to below 45°C after oil extraction, increasing the demand for circulating cooling water. As the temperature of the food waste slurry increases, the efficiency of oil extraction and the oil yield also increase. Therefore, there is currently no suitable solution for achieving both oil extraction efficiency and controlling the slurry temperature to meet anaerobic requirements.

[0006] Therefore, it is necessary to design a heat balance control system for kitchen waste and catering slurry, which heats the slurry temperature through a regulating valve and controls the cooling temperature and flow of the circulating cooling water, thereby meeting the maximum efficiency of slurry extraction and the temperature requirements of the anaerobic process, and achieving the requirements of precise control and temperature balance. Summary of the Invention

[0007] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a heat balance control system for kitchen waste and catering slurry. The slurry temperature is heated by a regulating valve and the cooling temperature and flow rate of the circulating cooling water are controlled, thereby meeting the maximum efficiency of slurry extraction and the temperature requirements of the anaerobic process, and achieving the requirements of precise control and temperature balance.

[0008] In order to achieve the above-mentioned purpose, the utility model provides a heat balance control system for kitchen waste and catering slurry, the steam input end of the mixing heater is connected to a regulating valve 1 through a pipeline, the slurry input end of the mixing heater is connected to a variable frequency regulating pump 1 through a pipeline, a thermometer 1 is provided on the mixing heater, the output end of the mixing heater is connected to an intermediate oil extraction processing system through a pipeline, the oil extraction processing system is connected to a shell and tube heat exchanger through a pipeline, a thermometer 2 is provided on the slurry output end pipeline of the shell and tube heat exchanger, and a regulating valve 2 is provided on the circulating cooling water output end pipeline of the shell and tube heat exchanger.

[0009] The input end of the shell and tube heat exchanger is connected to the circulating cooling water inlet pipe.

[0010] Compared with the existing technology, the utility model uses a regulating valve to heat the mixed heater and control the temperature during oil extraction, and then controls the temperature of the slurry after oil extraction to below 45°C by controlling the cooling circulating water to meet the anaerobic process, thereby achieving efficient oil extraction and anaerobic process at the same time, realizing precise control of the heat of kitchen waste slurry and catering slurry, improving oil extraction efficiency, reducing the use of circulating water and steam, and obtaining the most economical, efficient and balanced control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a system schematic diagram of the present utility model.

[0012] Description of Reference Numerals

[0013] Control valve 1, variable frequency control pump 2, mixing heater 3, thermometer 3-1, intermediate oil extraction processing system 4, shell and tube heat exchanger 5, thermometer 5-1, control valve 6. DETAILED DESCRIPTION

[0014] The present invention will now be further described with reference to the accompanying drawings.

[0015] See also Figure 1The utility model provides a heat balance control system for kitchen waste and catering slurry. The steam input end of the mixing heater 3 is connected to the regulating valve 1 through a pipeline, the slurry input end of the mixing heater 3 is connected to the frequency conversion regulating pump 2 through a pipeline, the mixing heater 3 is provided with a thermometer 3-1, the output end of the mixing heater 3 is connected to the intermediate oil extraction processing system 4 through a pipeline, the oil extraction processing system 4 is connected to the shell and tube heat exchanger 5 through a pipeline, the slurry output end pipeline of the shell and tube heat exchanger 5 is provided with a thermometer 2 5-1, and the circulating cooling water output end pipeline of the shell and tube heat exchanger 5 is provided with a regulating valve 2 6.

[0016] The input end of the shell and tube heat exchanger 5 is connected to the circulating cooling water inlet pipe.

[0017] The utility model does not require much debugging when used. The frequency conversion regulating pump 2 is set to adjust the slurry to a stable value. By adjusting the opening of the regulating valve 1 heated by the mixing heater 3, the amount of heating steam is controlled, and the slurry temperature in the mixing heater is adjusted to be stable and the fluctuation amplitude is within the allowable range.

[0018] A regulating valve 2 6 is added to the circulating cooling water outlet of the shell and tube heat exchanger 5. By adjusting the opening of the regulating valve 2 6, the circulating cooling water flow rate is controlled, thereby adjusting the heat exchange amount, controlling the temperature of the slurry sent to the anaerobic system to meet the requirements of the back-end system, and minimizing the use of circulating cooling water. The outlet slurry temperature of the shell and tube heat exchanger 5 needs to meet ≤45°C, and a certain safety margin is reserved.

[0019] After the above steps are adjusted and stabilized, the temperature of the mixed heater 3 and the slurry temperature of the anaerobic system after cooling are set to improve the efficiency of the equipment and reduce the steam consumption.

[0020] In the automatic temperature control of the mixing heater 3, the slurry temperature is used as the target setting value, and the control valve 1 of the mixing heater 3 is set as the adjustment value. The parameters are adjusted by trial and error, and the reasonable setting of temperature parameters is explored during the operation experiment to ensure the slurry temperature is stable and normal.

[0021] In the automatic temperature control of the double-tube heat exchanger 5, the slurry temperature at the outlet of the double-tube heat exchanger 5 is used as the target setting value, and the setting of the double-tube heat exchanger 5's regulating valve 26 is used as the adjustment value. The parameters are also adjusted through trial and error. During the operation experiment, the reasonable temperature parameters are explored to ensure the stable and normal slurry temperature at the outlet of the double-tube heat exchanger.

[0022] The above are only preferred embodiments of the present invention and are intended to help understand the method and core concept of this application. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be pointed out that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0024] The utility model comprehensively solves the shortcomings of the prior art in that there is a contradiction between heating for achieving efficient oil extraction and controlling the water temperature to meet the requirements of the anaerobic process. The regulating valve is used to respectively heat the mixed heater and control the temperature during oil extraction, and then the temperature of the slurry after oil extraction is controlled to be below 45°C to meet the requirements of the anaerobic process by controlling the cooling circulating water. This achieves the simultaneous requirements of efficient oil extraction and anaerobic process, realizes precise heat control of kitchen waste slurry and catering slurry, improves oil extraction efficiency, reduces the use of circulating water and steam, and obtains the most economical, efficient and balanced control method.

Claims

1. A food waste and catering slurry heat balance control system, characterized in that: The steam input end of the mixing heater (3) is connected to the regulating valve 1 (1) through a pipeline, the slurry input end of the mixing heater (3) is connected to the variable frequency regulating pump 1 (2) through a pipeline, the mixing heater (3) is provided with a thermometer 1 (3-1), the output end of the mixing heater (3) is connected to the intermediate oil extraction treatment system (4) through a pipeline, the oil extraction treatment system (4) is connected to the shell and tube heat exchanger (5) through a pipeline, the slurry output end pipeline of the shell and tube heat exchanger (5) is provided with a thermometer 2 (5-1), and the circulating cooling water output end pipeline of the shell and tube heat exchanger (5) is provided with a regulating valve 2 (6).

2. The food waste and catering slurry heat balance control system according to claim 1, characterized in that: The input end of the shell and tube heat exchanger (5) is connected to the circulating cooling water inlet pipe.

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