Aerobic fermentation system with closed oxygen supply

Abstract

The invention relates to the technical field of aerobic fermentation treatment, and in particular to an aerobic fermentation system with closed oxygen supply, comprising an aerobic fermentation device, a dust removal device, a dehumidification device, and an odor output pipeline, wherein the starting end of the odor output pipeline is connected to the odor output port of the aerobic fermentation device, the dust removal device and the dehumidification device are sequentially connected in series in the odor output pipeline, and further comprising a gas storage device, an odor combustion device, a heat exchange device, and an oxygen supply pipeline, wherein the starting end of the oxygen supply pipeline is connected to the air output port arranged on the upper part of the gas storage device, the end of the oxygen supply pipeline is connected to the oxygen input port of the aerobic fermentation device, the odor output port at the lower part of the gas storage device is connected to the odor combustion device through the odor pipeline, an air compensation mechanism is arranged on the top of the gas storage device, the heat exchange device is arranged at the dehumidification device, the cooling end of the heat exchange device is connected to the dehumidification device, and the heating end of the heat exchange device is connected to the oxygen supply pipeline, so as to realize closed cycle oxygen supply, low energy consumption, and zero odor emission.

Description

Technical Field

[0001] The invention relates to the technical field of aerobic fermentation treatment, in particular to an aerobic fermentation system with closed oxygen supply. Background Art

[0002] Kitchen waste is the waste generated in daily life, food processing, catering services, and corporate catering activities, including discarded vegetable leaves, leftovers, leftover rice, fruit peels, egg shells, tea dregs, bones, etc. Its main sources are family kitchens, restaurants, canteens, markets, and other industries related to food processing. Therefore, a large amount of kitchen waste is generated every day. Kitchen waste needs to be properly handled.

[0003] Aerobic fermentation process is the main process for the resource disposal of food waste and wet garbage. In the aerobic fermentation process, the general oxygen supply scheme is to use a high-pressure fan to supply oxygen, and a heating device is placed on the oxygen supply pipeline to heat the oxygen supply gas. The mixed gas containing ammonia NH3, hydrogen sulfide H2S, methanol, and water vapor with a temperature of 50-70 degrees generated during the fermentation process is discharged from the aerobic fermentation equipment through the exhaust fan. The existing technology generally uses acid-base scrubbing towers, biosorption, UV technology, etc. to treat the odor mixed gas. The odor treatment process has a large amount of odor treatment, and the heat of the exhaust gas is discharged into the air, which not only wastes heat energy, but also produces white smoke (water vapor) during the emission process. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an aerobic fermentation system with a closed oxygen supply in view of the above-mentioned defects, which can reduce the amount of odor disposal, realize closed cycle oxygen supply, recover the heat in the mixed gas, avoid the phenomenon of white smoke in the odor emission air, and achieve zero odor emission by passing high-concentration odor through an odor incineration device with a temperature of up to 2000 degrees.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] An aerobic fermentation system with closed oxygen supply comprises an aerobic fermentation device, a dust removal device, a dehumidification device, and an odor output pipeline. The starting end of the odor output pipeline is connected to the odor output port of the aerobic fermentation device. The dust removal device and the dehumidification device are sequentially connected in series in the odor output pipeline. The system is characterized in that it also comprises a gas storage device, an odor combustion device, a heat exchange device, and an oxygen supply pipeline. The starting end of the oxygen supply pipeline is connected to the air output port provided on the upper part of the gas storage device, and the end of the oxygen supply pipeline is connected to the oxygen input port of the aerobic fermentation device. The lower part of the gas storage device is provided with an odor output port, and the odor output port is connected to the odor combustion device through the odor pipeline. The discharge port of the odor combustion device is connected to the waste heat recovery device. The waste heat recovery device is connected to the oxygen supply pipeline to heat the air flowing through the oxygen supply pipeline. The top of the gas storage device is provided with an air compensation device. The heat exchange device is arranged at the dehumidification device, the cooling end of the heat exchange device is connected to the dehumidification device, the heat exchange device cools down the odor entering the dehumidification device, and the heating end of the heat exchange device is connected to the oxygen supply pipeline to heat the air in the oxygen supply pipeline. The odor combustion device is an odor burner, and the odor burner is provided with a combustion exhaust pipeline. The waste heat recovery device is connected to the combustion exhaust pipeline. The waste heat recovery device includes a box body sleeved on the outside of a certain section of the combustion exhaust pipeline, a spiral coil located inside the combustion exhaust pipeline, and heat absorbing fins. The spiral coil is arranged along the internal spiral of the combustion exhaust pipeline, and the heat absorbing fins are connected to the spiral coil. The heat absorbing fins extend from the inner side of the spiral coil to the axial side of the combustion exhaust pipeline. The spiral coil is connected to the box body, and the box body is provided with a heat exchange medium inlet and a heat exchange medium outlet.

[0007] Furthermore, the oxygen supply pipeline is also provided with a heating device, which is connected to the heat exchange device.

[0008] Furthermore, the dust removal device is provided with a dust removal drain outlet at the bottom, the dehumidification device is provided with a dehumidification drain outlet at the bottom, and the gas storage device is provided with a drain outlet at the bottom. The dust removal drain outlet, the dehumidification drain outlet, and the drain outlet are all connected to a drain pipeline.

[0009] Furthermore, the oxygen supply pipeline is provided with an oxygen supply fan, a pressure sensor, and a flow sensor; the pressure sensor and the flow sensor are connected to an oxygen supply controller, and the oxygen supply controller is connected to control the oxygen supply fan.

[0010] Furthermore, the air compensation mechanism includes an air compensation pipeline and a one-way ventilation valve arranged on the air compensation pipeline.

[0011] Furthermore, the odor pipeline is provided with an odor blower and an odor valve for controlling the on-off of the odor pipeline.

[0012] Furthermore, the aerobic fermentation device is an aerobic fermentation tank, and the gas storage device is a gas storage tank.

[0013] Furthermore, the heat exchange device is an air energy heat pump compressor unit.

[0014] The beneficial effects of the present invention are: by adopting the above scheme,

[0015] 1. The odor generated by aerobic fermentation of kitchen waste is not discharged. This system is airtight and burns the odor generated by fermentation, converting it into water and carbon dioxide, reducing the emission of harmful gases.

[0016] 2. This system does not require acid-base washing towers, biological adsorption and other equipment, and does not require the addition of other auxiliary materials during the treatment process, which greatly reduces the operating costs;

[0017] 3. The air energy heat pump unit is cleverly used to fully utilize the heat in the circulating air, saving more than 50% of energy and significantly reducing energy consumption;

[0018] 4. Automatically replenish fresh air. This system preheats the fresh air during the transportation process, which improves the efficiency and effect of aerobic fermentation, ferments the food waste more thoroughly, improves the resource utilization of food waste, and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0020] Figure 1 A connection block diagram of an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the longitudinal cross-section structure of a waste heat recovery device in one embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of a waste heat recovery device according to an embodiment of the present invention.

[0023] Among them: 1 is an aerobic fermentation tank, 2 is a dust collector, 3 is a dehumidifier, 31 is a heat exchange heater, 4 is a gas storage tank, 41 is an air compensation pipeline, 42 is a one-way ventilation valve, 5 is an odor burner, 51 is a combustion emission pipeline, 6 is a combustion fan, 7 is an odor pipeline, 71 is an odor valve, 8 is an air energy heat pump compressor unit, 9 is an oxygen supply pipeline, 91 is an oxygen supply fan, 92 is a pressure sensor, 93 is a flow sensor, 10 is an odor output pipeline, and 11 is a waste heat recovery device. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] The aerobic fermentation system with closed oxygen supply comprises an aerobic fermentation tank 1, a dust collector 2, a dehumidifier 3, an odor output pipeline 10, a gas storage tank 4, an odor burner 5, an air energy heat pump compressor unit 8, and an oxygen supply pipeline 9. The odor burner can adopt an RTO combustion furnace. The starting end of the odor output pipeline 10 is connected to the odor output port of the aerobic fermentation tank 1. The dust collector 2 and the dehumidifier 3 are sequentially connected in series in the odor output pipeline 10. The end of the odor output pipeline 10 is connected to the odor input port of the gas storage tank 4. The lower tank body of the gas storage tank 4 is provided with an odor output port, and the odor output port is connected to the odor burner 5 through an odor pipeline 7. The odor pipeline 7 is provided with an odor fan 6 and an odor valve 71 for controlling the on-off of the odor pipeline. The exhaust port of the odor burner 5 is provided with a combustion exhaust pipeline 51, and the combustion exhaust pipeline 51 is provided with a waste heat recovery device 11. The gas storage tank 4 An air outlet is provided at the upper part of the tank body, and the starting end of the oxygen supply pipeline 9 is connected to the air outlet of the gas storage tank 4. After the oxygen supply pipeline 9 is led out from the upper part of the gas storage tank 4, it first passes through the waste heat recovery device 11, and the air in the oxygen supply pipeline 9 is heated by the waste heat recovery device 11. The end of the oxygen supply pipeline 9 is connected to the oxygen input port of the aerobic fermentation tank 1. An oxygen supply fan 91, a pressure sensor 92, and a flow sensor 93 are provided on the oxygen supply pipeline 9. The pressure sensor 92 and the flow sensor 93 are connected to an oxygen supply controller, and the oxygen supply controller is connected to control the oxygen supply fan 91. An air compensation pipeline 41 and a one-way ventilation valve 42 are provided on the top of the gas storage tank 4. The one-way ventilation valve 42 can only allow fresh air from the outside to enter the gas storage tank 4 from the upper part to replenish fresh air and avoid the gas storage tank 4 from a negative pressure state.

[0026] The air energy heat pump compressor unit 8 is arranged at the dehumidifier 3, the air energy heat exchange pump compressor unit 8 is connected to the dehumidifier and the heat exchange heater 31, the oxygen supply pipeline 9 passes through the heat exchange heater 31, the oxygen supply pipeline 9 is connected to the heat exchange heater 31, the kitchen waste is aerobically fermented in the aerobic fermentation tank to produce hot and humid odor, the hot and humid odor is purified by the dust collector and then passed into the dehumidifier for dehumidification, the evaporator of the air energy heat pump compressor unit 8 is connected to or close to the odor output pipeline to absorb the heat in the hot and humid odor, and the heat of the odor The refrigerant introduced into the air energy heat pump compressor unit is absorbed by the evaporator of the air energy heat pump compressor unit, and the refrigerant then introduces the heat into the heat exchange heater 31 to heat the air in the oxygen supply pipeline. The refrigerant becomes a low-temperature and low-pressure state after the capillary action in the air energy heat pump compressor unit, and cools the dehumidifier. Then the refrigerant circulates in the air energy heat pump compressor unit, absorbing and releasing heat in a cycle, making full use of the heat of the odor. The heated hot air can promote the efficiency of aerobic fermentation and also has an energy storage effect. Subsequent energy storage of air energy heat pump units, burners, etc. reduces the external energy consumption required for subsequent processing. The entire system is closed, and the temperature of the odor and air in the system is effectively utilized, effectively improving the function of gas heat. The refrigerant of the air energy heat pump compressor unit absorbs the heat energy of the humid hot air and conducts it to the heat exchange heater. After the exchange, the refrigerant in a low temperature state passes through the dehumidifier, and the low temperature refrigerant is used to provide a low temperature for the dehumidifier, so that the dehumidifier maintains a low temperature. Then the odor entering the dehumidifier is cooled, and the moisture in the odor condenses into liquid water. Since ammonia is soluble in water, while water vapor condenses into water, the ammonia in the odor dissolves in the condensed water after condensation, removing the moisture and ammonia in the odor. The air energy heat pump compressor unit fully utilizes the heat in the odor. Compared with the existing cold water condensation cooling tower system and electric heating system, the energy consumption during the operation of the air energy heat pump unit is low, and compared with the existing condensation dehumidification system, more than 50% of energy is saved, realizing low-energy consumption treatment of aerobic fermentation of food waste, which greatly reduces the treatment cost.

[0027] The working principle and process of this system are as follows:

[0028] This system is a closed system. When the aerobic fermentation tank 1 is running, the oxygen supply fan 91 is started, and the air in the gas storage bin 4 is extracted through the oxygen supply pipeline 9, and the air containing oxygen is sent into the aerobic fermentation tank 1 through the oxygen supply pipeline 9. During the oxygen supply process, the pressure sensor 92 and the flow sensor 93 arranged on the oxygen supply pipeline 9 feed back the gas supply signal to the oxygen supply controller in real time, and the oxygen supply amount is grasped in real time. The control of the oxygen supply fan 91 is adjusted in real time through the oxygen supply controller to provide sufficient oxygen for the aerobic fermentation tank 1, so as to maintain a high fermentation efficiency in the aerobic fermentation tank, improve the treatment effect of food waste, and maintain a high treatment efficiency of food waste.

[0029] The aerobic fermentation process in the aerobic fermentation tank 1 generates a hot and humid mixed odor gas containing water vapor, dust, ammonia, and hydrogen sulfide. The hot and humid mixed odor gas first enters the dust collector 2 through the odor output pipeline 10. The dust contained in the hot and humid mixed odor gas is separated under the action of the dust collector 2 to obtain a clean hot and humid mixed odor gas. The dust is separated by the dust collector 2, and the separated dust is discharged through the dust removal sewage outlet at the bottom of the dust collector 2. The clean hot and humid mixed odor gas continues to enter the dehumidifier 3 and the air energy heat pump compressor unit through the odor output pipeline. The clean hot and humid mixed odor gas is discharged from the air energy heat pump compressor unit. Heat exchange is carried out inside to heat the heat exchange heater 31 and cool the dehumidifier. Through the action of the dehumidifier, the water vapor contained in the odor is condensed into liquid water in the dehumidifier, and the ammonia contained in the odor is dissolved in the liquid water to obtain a dry mixed odor gas with ammonia removed. The dehumidifier 3 separates the water in the mixed odor and separates the ammonia at the same time. Since the ammonia content in the mixed odor is not very high, the ammonia in the mixed odor will dissolve in the separated water, thereby achieving the purpose of separating water vapor and ammonia. The ammonia separated by the dehumidifier is discharged through the dehumidification drain outlet at the bottom of the dehumidifier and collected in the ammonia collection container.

[0030] The dried mixed odor gas then enters the gas storage tank 4 through the odor output pipeline for storage. The dehumidified and dried mixed odor gas enters the gas storage tank. The hydrogen sulfide and alcohol gases contained in the mixed odor gas are heavier than air and will gradually settle to the lower part of the gas storage bin. The mixed odor is stratified in the gas storage tank. The lower part of the gas storage tank is the odor containing most of the hydrogen sulfide and alcohol gases, and the upper part of the gas storage tank is the air containing very little odor. The odor accumulates continuously in the gas storage tank 4. When the odor concentration in the lower part of the gas storage tank 4 is high, the odor valve 71 on the odor pipeline 7 is opened, and the odor blower 6 is operated to input the odor containing hydrogen sulfide and alcohol gases in the lower part of the gas storage tank into the odor burner 5 through the odor pipeline. The odor burns in the odor burner 5, and after combustion, the odor is converted into The combustion exhaust gas containing water, carbon dioxide and sulfur dioxide is discharged through the combustion exhaust pipeline 12. The waste heat recovery device arranged on the combustion exhaust pipeline 12 recovers the discharged heat to save energy consumption. The water and carbon dioxide in the combustion exhaust gas do not pollute the atmosphere and can be discharged directly. The combustion exhaust gas containing sulfur dioxide is a toxic gas. The exhaust gas whose discharge heat is recovered by the waste heat recovery device is led to the set desulfurization tower. Ammonia water is sprayed on the combustion exhaust gas in the desulfurization tower to treat the sulfur dioxide in the exhaust gas. After the desulfurization treatment, the pollution of the exhaust gas to the atmosphere is greatly reduced and can be discharged. The ammonia water collected and stored in the ammonia water collection container is transported to the desulfurization tower for use through a pumping pipeline. During the operation of this system, no odor is emitted. After the odor is treated, it is converted into water and carbon dioxide, which is pollution-free. The harmful components in the odor can be effectively treated to avoid pollution to the atmosphere.

[0031] During the process of the gas storage tank 4 conveying odor to the odor burner, the one-way ventilation valve 42 on the upper part of the gas storage tank 4 continuously replenishes fresh air into the gas storage tank to avoid negative pressure in the gas storage tank, provide external fresh air for the entire system, ensure the smooth operation of the system, and ensure the full combustion of the odor burner. During the operation of the odor burner, the air in the upper part of the gas storage tank 4 and the fresh air entering from the outside in time enter the oxygen supply pipeline through the air outlet, and the waste heat recovery device heats the fresh air flowing through the oxygen supply pipeline. The fresh air in the oxygen supply pipeline is heated twice by the waste heat recovery device and the heat exchange heater in turn to be high-temperature air, and the high-temperature air is input into the aerobic fermentation The tank can promote accelerated fermentation and improve the efficiency and effect of garbage fermentation. This system is an odor closed system. The odor produced by aerobic fermentation of food waste will not leak, and it has the characteristics of closed odor treatment. Gas storage tank 4 and aerobic fermentation tank 1 can be equipped with independent pressure gauges to detect pressure, thereby improving the safe and efficient operation of this system. High-concentration odor gas turns into water and carbon dioxide after combustion, and the harmful gases therein are effectively purified. No other auxiliary materials need to be added during the operation process, which reduces the cost of food waste treatment, eliminates the use of complex acid-base washing towers, biological adsorption and other deodorization equipment, and does not need to supplement acid, alkali, biomass adsorption materials, etc. The operating cost of treating food waste is greatly reduced.

[0032] During the gas circulation process, the odor flows in a closed system including the aerobic fermentation tank, and fresh air is supplemented from the outside to prevent the odor from being discharged into the air. During the odor dust removal and dehumidification process, the air energy heat pump unit uses the heat in the circulating gas for dehumidification, saving more than 50% of energy and greatly reducing the system energy consumption. It has the characteristics of low energy consumption. High-concentration odor is burned and turned into water and carbon dioxide, achieving zero odor emissions.

[0033] A dust collector discharge port is provided at the bottom of the dust collector, and a dust collector discharge valve is provided at the dust collector discharge port. A dehumidifier discharge port is provided at the bottom of the dehumidifier, and a dehumidifier discharge valve is provided at the dehumidifier discharge port. A discharge port is provided at the bottom of the gas storage tank, and a discharge valve is provided at the discharge port. The dust collector discharge port, the dehumidifier discharge port, and the discharge port are all connected to the discharge pipeline for easy discharge of sewage.

[0034] Reference Figure 2 , Figure 3The waste heat recovery device includes a box body 111 sleeved on the outside of a certain section of the combustion exhaust pipeline 51, a spiral coil 112 located inside the combustion exhaust pipeline 51, and a heat-absorbing fin 113. The spiral coil 112 is arranged along the internal spiral of the combustion exhaust pipeline, and the heat-absorbing fin is connected to the spiral coil. The heat-absorbing fin extends from the inner side of the spiral coil to the axial side of the combustion exhaust pipeline. The heat-absorbing fin increases the contact area with the exhaust gas and slows down the exhaust gas emission flow rate. This structure can utilize the effective space in the exhaust pipeline, set a large number of heat-absorbing fins, and improve the efficiency of absorbing the waste heat of the exhaust gas. The spiral coil 112 is connected to the box 111. The box 111 is provided with a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange medium can be water. The box body and the spiral coil are filled with water. The spiral coil and the heat-absorbing fins absorb the heat of the exhaust gas in the combustion exhaust pipeline, and convert the heat into the thermal energy of the water in the box 111. The heated water is discharged through a heat exchange medium outlet for preheating and recycling. The diameter of the heat exchange medium inlet is larger than the diameter of the heat exchange medium outlet, forming a difference in flow rate and pressure, which can extend the residence time of the heat exchange medium in the box, fully absorb heat, and improve the efficiency of waste heat recovery from the exhaust gas.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An aerobic fermentation system with closed oxygen supply, including an aerobic fermentation device, a dust removal device, a dehumidification device, and an odor output pipeline. The starting end of the odor output pipeline is connected to the odor output port of the aerobic fermentation device. The dust removal device and the dehumidification device are connected in series in the odor output pipeline in sequence. It is characterized in that It also includes a gas storage device, an odor combustion device, a heat exchange device, and an oxygen supply pipeline. The starting end of the oxygen supply pipeline is connected to the air output port arranged on the upper part of the gas storage device, and the end of the oxygen supply pipeline is connected to the oxygen input port of the aerobic fermentation device. The lower part of the gas storage device is provided with an odor output port, and the odor output port is connected to the odor combustion device through the odor pipeline. The discharge port of the odor combustion device is connected to the waste heat recovery device. The waste heat recovery device is connected to the oxygen supply pipeline to heat the air flowing through the oxygen supply pipeline. The top of the gas storage device is provided with an air compensation mechanism. The heat exchange device is arranged at the dehumidification device. The cooling end of the heat exchange device is connected to the dehumidification device. The heat exchange device heats the air entering the dehumidification device. The odor is cooled down, and the heating end of the heat exchange device is connected to the oxygen supply pipeline to heat the air in the oxygen supply pipeline. The odor combustion device is an odor burner, and the odor burner is provided with a combustion emission pipeline. The waste heat recovery device is connected to the combustion emission pipeline. The waste heat recovery device includes a box body sleeved on the outside of a certain section of the combustion emission pipeline, a spiral coil inside the combustion emission pipeline pipe body, and heat-absorbing fins. The spiral coil is arranged along the internal spiral of the combustion emission pipeline, and the heat-absorbing fins are connected to the spiral coil. The heat-absorbing fins extend from the inner side of the spiral coil to the axial side of the combustion emission pipeline. The spiral coil is connected to the box body, and the box body is provided with a heat exchange medium inlet and a heat exchange medium outlet.

2. According to the aerobic fermentation system with closed oxygen supply as described in claim 1, the oxygen supply pipeline is also provided with a heating device, and the heating device is connected to the heat exchange device.

3. According to the aerobic fermentation system with closed oxygen supply in claim 1, a dust removal sewage outlet is provided at the bottom of the dust removal device, a dehumidification sewage outlet is provided at the bottom of the dehumidification device, and a sewage outlet is provided at the bottom of the gas storage device, and the dust removal sewage outlet, the dehumidification sewage outlet, and the sewage outlet are all connected to the sewage pipeline.

4. According to the aerobic fermentation system with closed oxygen supply in claim 1, an oxygen supply fan, a pressure sensor, and a flow sensor are arranged on the oxygen supply pipeline; the pressure sensor and the flow sensor are connected to an oxygen supply controller, and the oxygen supply controller is connected to control the oxygen supply fan.

5. According to the aerobic fermentation system with closed oxygen supply as claimed in claim 1, the air compensation mechanism comprises an air compensation pipeline and a one-way ventilation valve arranged on the air compensation pipeline.

6. According to the aerobic fermentation system with closed oxygen supply as claimed in claim 1, the odor pipeline is provided with an odor blower and an odor valve for controlling the on-off of the odor pipeline.

7. The aerobic fermentation system with closed oxygen supply according to claim 1, wherein the aerobic fermentation device is an aerobic fermentation tank, and the gas storage device is a gas storage tank.

8. According to the aerobic fermentation system with closed oxygen supply as claimed in claim 1, the heat exchange device is an air energy heat pump compressor unit.

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