Bone soup extraction external heat exchange circulating heating system

Abstract

The present application relates to the field of food processing, and discloses a bone soup extraction external heat exchange circulating heating system, which comprises an extraction container, a bone material containing unit, an external circulating heating loop, a light phase bypass unit, a sediment discharge unit and a control unit. The external circulating heating loop comprises a clear liquid leading-out unit, a buffer filtering unit, a circulating conveying unit, an external heat exchange unit, a bypass circulating branch and a backflow heating unit. The control unit cooperatively controls the leading-out of the main liquid phase, the heat exchange backflow, the leading-out of the light phase and the discharge of the sediment according to the temperature of the upper and lower parts of the extraction container, the circulating flow, the filtering pressure difference and the liquid level state, so that the middle part of the main liquid phase is externally circulated and heated, the top floating oil foam and the bottom sediment are respectively processed in separate branches, and the stable heating and layered control in the bone soup extraction process are suitable.

Description

Technical Field

[0001] This invention relates to the field of food processing, and more specifically to an external heat exchange circulation heating system for bone broth extraction. Background Technology

[0002] In the processing of bone broth products, bone materials and extracts are usually placed in an extraction container and continuously heated to allow the flavor components, collagen components and some soluble nutrients in the bone materials to gradually transfer to the liquid phase. Therefore, the heat transfer method, liquid phase flow state and impurity separation state during the extraction process directly affect the extraction efficiency, flavor stability and subsequent processing quality of the bone broth.

[0003] Existing bone broth extraction equipment mostly uses jacket heating, steam heating, or direct circulation heating within the container to raise the overall temperature of the material inside the extraction container. To accelerate heat transfer and component release, some equipment also uses methods such as stirring, bottom reflux extraction, and internal circulation. For the floating oil, foam, and settled bone residue formed during the extraction process, they are usually treated by oil separation, residue removal, and filtration after extraction.

[0004] However, under the above structure and operation mode, the upper floating oil foam, the middle main liquid phase and the bottom bone residue sediment in the extraction container are often in the same heated and disturbed system. Especially during overall heating, bottom liquid pumping and reflux or forced circulation, the top light phase is easily entrained and the lower sediment is easily re-lifted, which destroys the originally gradually formed stratification state, further leading to increased liquid phase emulsification, increased filtration load in the circulation path, decreased stability of the heat exchange process, and difficulty in maintaining a uniform temperature field distribution in the extraction container, ultimately affecting the continuity and extraction effect of the bone broth extraction process. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an external heat exchange circulation heating system for bone broth extraction, thereby solving the technical problems existing in the prior art.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] An external heat exchange circulation heating system for bone broth extraction includes:

[0008] An extraction container, an aggregate receiving unit disposed within the extraction container, an external circulation heating circuit, a light phase bypass unit, a sludge discharge unit, and a control unit;

[0009] The external circulation heating circuit includes a clear liquid outlet unit, a buffer filtration unit, a circulation conveying unit, an external heat exchange unit, a bypass circulation branch, and a reflux heating unit;

[0010] The clear liquid exporting unit is connected to at least one of the middle and lower regions of the extraction container. The buffer filtration unit is located between the clear liquid exporting unit and the circulation conveying unit. The output end of the circulation conveying unit is connected to the input end of the external heat exchange unit. The output end of the external heat exchange unit is connected to the upper part of the extraction container via the reflux heating unit. The bypass circulation branch is connected in parallel with the external heat exchange unit.

[0011] The light phase bypass unit is connected to the upper liquid surface area of ​​the extraction container and is used to export the floating oil and foam formed during the extraction process from the extraction container.

[0012] The sludge discharge unit is connected to the bottom of the extraction container and is used to remove bone residue and sedimented impurities deposited at the bottom during the extraction process.

[0013] The control unit is connected to the circulating conveying unit, the external heat exchange unit, the light phase bypass unit, and the sludge discharge unit, respectively. It is also connected to a first temperature detection unit located at the top of the extraction container, a second temperature detection unit located at the bottom of the extraction container, a flow detection unit located in the external circulating heating circuit, and a differential pressure detection unit located on both sides of the buffer filtration unit. Based on the detection results of the first and second temperature detection units, the circulating flow rate, and the filtration differential pressure, the control unit controls the switching of the circulation path of the external circulating heating circuit, the activation of the light phase bypass unit, and the activation of the sludge discharge unit.

[0014] Preferably, the clear liquid export unit includes a first liquid guiding branch communicating with the middle region of the extraction container and a second liquid guiding branch communicating with the lower region of the extraction container, and the first liquid guiding branch and the second liquid guiding branch are respectively provided with a conduction control element;

[0015] The control unit is used to control the first liquid guiding branch and the second liquid guiding branch to be simultaneously connected during the preheating stage, to control the first liquid guiding branch to remain connected and reduce the liquid guiding volume of the second liquid guiding branch during the extraction stage, and to control the second liquid guiding branch to be closed when the detection value of the differential pressure detection unit reaches a preset threshold.

[0016] Preferably, the buffer filtration unit includes a flow stabilizing buffer section, a gas-liquid separation section and a pre-filtration section connected in sequence. The gas phase outlet of the gas-liquid separation section is connected to the light phase bypass unit. The pre-filtration section is located between the gas-liquid separation section and the circulation conveying unit to intercept bone residue particles, agglomerated impurities and foam entrainment in the discharged liquid phase.

[0017] Preferably, the differential pressure detection unit is respectively located on the inlet side and the outlet side of the pre-filtration section;

[0018] The control unit is used to reduce the output of the circulating conveying unit when the detection value of the differential pressure detection unit reaches a first preset threshold, control the bypass circulation branch to be turned on when the detection value of the differential pressure detection unit reaches a second preset threshold, and start the cleaning process of the pre-filter when the external circulation heating circuit is in a low flow state or a stop flow state.

[0019] Preferably, the bypass circulation branch bypasses the external heat exchange unit and is connected to the inlet side and outlet side of the external heat exchange unit, respectively;

[0020] The control unit is used to increase the flow rate of the bypass circulation branch when the temperature difference between the first temperature detection unit and the second temperature detection unit is lower than a first preset threshold, and to increase the proportion of liquid phase flowing through the external heat exchange unit when the temperature difference is higher than a second preset threshold.

[0021] Preferably, the external heat exchange unit is an indirect heat exchange heating unit, and its heat exchange medium circuit is isolated from the bone broth extract circuit.

[0022] The external heat exchange unit is provided with a third temperature detection unit and a fourth temperature detection unit at its inlet and outlet sides, respectively. The control unit is used to adjust the heat exchange intensity of the external heat exchange unit according to the detection results of the third temperature detection unit and the fourth temperature detection unit, so as to limit the temperature rise of the liquid phase flowing back into the extraction container after a single external circulation.

[0023] Preferably, the reflux heating unit is circumferentially connected to the upper part of the extraction container, and the liquid phase heated by the external heat exchange unit flows back down along the inner wall of the extraction container;

[0024] A liquid phase circulation channel is formed between the aggregate receiving unit and the inner wall of the extraction container, so that the reflux liquid phase flows down the inner wall from the top of the extraction container and then flows through the area where the aggregate receiving unit is located.

[0025] Preferably, the light phase bypass unit includes a light phase outlet branch connected to the upper liquid surface area of ​​the extraction container, a conduction control component disposed on the light phase outlet branch, and a light phase temporary storage unit connected to the light phase outlet branch.

[0026] The control unit is used to control the light phase outlet branch to open intermittently according to the detection result of the first temperature detection unit, preset time conditions, or liquid level detection result, so as to separately export floating oil and foam from the extraction container.

[0027] Preferably, the sludge discharge unit includes a sludge collection branch connected to the bottom of the extraction container, a discharge control component disposed on the sludge collection branch, and a sludge temporary storage unit connected to the sludge collection branch.

[0028] The control unit is used to control the discharge control element to open when the external circulation heating circuit is in a low flow state, a stop flow state, or the light phase bypass unit is closed, so as to export the bone residue and sedimented impurities deposited at the bottom of the extraction container.

[0029] Preferably, the control unit is used to perform staged cyclic heating control, which includes a preheating stage, an extraction stage, and a deep extraction stage;

[0030] During the preheating stage, the external circulation heating circuit is controlled to operate according to the first circulation parameters to improve the uniformity of the liquid phase temperature field in the extraction container.

[0031] During the extraction stage, the external circulation heating circuit is controlled to operate according to the second circulation parameters so that the temperature difference between the first temperature detection unit and the second temperature detection unit is maintained within a preset range.

[0032] During the deep extraction stage, the external circulation heating circuit is controlled to operate alternately with a circulation run and a static run, and during the static run, liquid phase disturbances in the extraction container are restricted except for the export of light phase and the discharge of sludge.

[0033] In summary, the present invention has the following main beneficial effects:

[0034] By dividing the liquid phase in the extraction container into upper light phase, middle main liquid phase, and bottom sediment, the goal of stably introducing the main liquid phase suitable for circulating heating into the external circulating heating circuit during bone broth extraction is achieved. Specifically, during the preheating stage, the control unit controls the first and second liquid guiding branches in the clear liquid outlet unit to jointly guide the liquid, so that the liquid phase in the middle and lower regions of the extraction container passes through the buffer filtration unit, the circulating conveying unit, and the external heat exchange unit in sequence, and is then returned to the upper part of the extraction container by the reflux heating unit. The reflux liquid phase flows down the inner wall of the extraction container and enters the area where the aggregate receiving unit is located, thereby forming a top-down circulating heat exchange path in the extraction container. By continuously introducing heat into the middle main liquid phase and ensuring full contact with the aggregate, the effect of uniform overall heating and rapid establishment of the temperature field in the early stage of extraction is achieved.

[0035] After entering the stable extraction stage, the control unit coordinates the output of the circulation conveying unit, the heat exchange intensity of the external heat exchange unit, and the flow rate ratio of the bypass circulation branch based on the temperature difference between the upper and lower parts of the extraction container, the single temperature rise before and after the external heat exchange unit, and the flow rate changes in the external circulation heating loop. This achieves the goal of maintaining the extraction temperature while limiting excessive temperature rise in a single cycle. Simultaneously, the outgoing liquid phase is stabilized, separated, and pre-filtered through the flow stabilization buffer section, gas-liquid separation section, and pre-filtration section in the buffer filtration unit. This reduces the risk of foam entrainment, bone residue particles entering the main circulation, and blockage of the heat exchange channel. The heated liquid phase is slowly released and refluxed along the inner wall of the extraction container through the reflux heating unit. This avoids direct impact of the high-temperature liquid phase on the aggregate area, reduces bone residue lifting, and minimizes repeated grease entrainment, ensuring that the central liquid phase remains the primary target of the external circulation heating loop.

[0036] During and in the later stages of extraction, the floating oil and foam formed on the upper surface of the extraction container are intermittently removed through the light phase bypass unit, while the bone residue and settled impurities accumulated at the bottom of the extraction container are discharged through the sediment discharge unit at low flow rates or in a stopped state, thus preventing the top light phase and bottom sediment from entering the main circulation. Simultaneously, by controlling the external circulation heating circuit to alternate between circulating and stationary operation periods, system disturbance is reduced while maintaining continuous heating, promoting the diffusion of soluble components from the aggregate into the bulk liquid phase. Therefore, by implementing external heat exchange circulation heating for the central bulk liquid phase, bypassing the top light phase, and discharging the bottom sediment separately, the extraction process achieves uniform temperature, stable liquid phase, timely impurity separation, and a balance between extraction efficiency and stability. Attached Figure Description

[0037] Figure 1 This is a block diagram of the overall structure of the external heat exchange circulation heating system for bone broth extraction according to the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of the extraction container and the aggregate receiving unit of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] refer to Figure 1-2An external heat exchange circulation heating system for bone broth extraction includes the following steps:

[0042] An extraction container, an aggregate receiving unit disposed within the extraction container, an external circulation heating circuit, a light phase bypass unit, a sludge discharge unit, and a control unit;

[0043] The external circulation heating circuit includes a clear liquid outlet unit, a buffer filtration unit, a circulation conveying unit, an external heat exchange unit, a bypass circulation branch, and a reflux heating unit;

[0044] The clear liquid exporting unit is connected to at least one of the middle and lower regions of the extraction container. The buffer filtration unit is located between the clear liquid exporting unit and the circulation conveying unit. The output end of the circulation conveying unit is connected to the input end of the external heat exchange unit. The output end of the external heat exchange unit is connected to the upper part of the extraction container via the reflux heating unit. The bypass circulation branch is connected in parallel with the external heat exchange unit.

[0045] The light phase bypass unit is connected to the upper liquid surface area of ​​the extraction container and is used to export the floating oil and foam formed during the extraction process from the extraction container.

[0046] The sludge discharge unit is connected to the bottom of the extraction container and is used to remove bone residue and sedimented impurities deposited at the bottom during the extraction process.

[0047] The control unit is connected to the circulating conveying unit, the external heat exchange unit, the light phase bypass unit, and the sludge discharge unit, respectively. It is also connected to a first temperature detection unit located at the top of the extraction container, a second temperature detection unit located at the bottom of the extraction container, a flow detection unit located in the external circulating heating circuit, and a differential pressure detection unit located on both sides of the buffer filtration unit. Based on the detection results of the first and second temperature detection units, the circulating flow rate, and the filtration differential pressure, the control unit controls the switching of the circulation path of the external circulating heating circuit, the activation of the light phase bypass unit, and the activation of the sludge discharge unit.

[0048] The extraction container is a vertical, closed container. It has an upper liquid level area, a middle area, and a lower area. The bottom of the extraction container forms a low-level collection zone to facilitate the concentration of sediment and settling impurities. The upper part of the extraction container is equipped with a feed port, an observation port, and an exhaust port. The middle and lower parts are respectively provided with liquid guiding interfaces for connection to the external circulation heating circuit, and the bottom is equipped with a sludge discharge interface for connection to the sludge discharge unit.

[0049] The upper liquid level area of ​​the extraction container is also equipped with a liquid level detection unit. The liquid level detection unit is used to detect at least one of the following: liquid level height, foam layer height, or liquid level fluctuation state. The liquid level detection unit can be any one of a float level switch, guided wave level gauge, ultrasonic level gauge, or capacitive level detector, so that the control unit can determine the light phase accumulation in the upper liquid level area based on its detection results and control the timing and duration of the light phase bypass unit's activation.

[0050] In this embodiment, the aggregate receiving unit is disposed inside the extraction container and located in the middle region of the extraction container's inner cavity. The aggregate receiving unit can be any of a cylindrical support frame, a cage-type support frame, or a liquid-permeable receiving basket. For ease of explanation, in this embodiment, the aggregate receiving unit uses a cylindrical support frame arranged along the axis of the extraction container, with a continuous liquid-phase circulation channel between the cylindrical support frame and the inner wall of the extraction container. After pretreatment, the aggregate is loaded into the aggregate receiving unit. The extractant can pass through the liquid-permeable wall of the aggregate receiving unit and contact the aggregate, forming a circulating flow path around the aggregate receiving unit within the extraction container. This arrangement, on the one hand, keeps the aggregate within the predetermined extraction area, preventing large-scale tumbling and impact of the aggregate during extraction; on the other hand, it allows the reflux liquid phase to first descend along the inner wall of the extraction container and then enter the aggregate area via the periphery of the aggregate receiving unit, thereby reducing the direct impact of the high-temperature reflux liquid on the aggregate.

[0051] In this embodiment, the permeable wall of the aggregate receiving unit is not used as the main filtration component; its primary function is to spatially confine the aggregate and shape the flow channel. This design is because the bone broth extraction process involves both a floating light phase and a bottom sediment and intermediate liquid phase. If the aggregate receiving unit were also used as a fine filter, the filtration function would easily mix with the aggregate carrying function, leading to blockages that would affect both liquid conduction and aggregate extraction. Therefore, this embodiment separates the aggregate containment from the external circulation pre-filtration to improve operational stability.

[0052] In this embodiment, the external circulation heating circuit includes a clear liquid export unit, a buffer filtration unit, a circulation conveying unit, an external heat exchange unit, a bypass circulation branch, and a reflux heating unit.

[0053] Clear liquid export unit:

[0054] The clear liquid export unit is used to export the liquid phase suitable for entering the external circulation heating circuit from the extraction container.

[0055] In this embodiment, the clear liquid export unit includes a first liquid guiding branch communicating with the middle region of the extraction container and a second liquid guiding branch communicating with the lower region of the extraction container. Each of the first and second liquid guiding branches is equipped with a flow control element. The flow control element can be any one of an electric valve, a pneumatic valve, or a solenoid valve, so that the control unit can control the opening, closing, and opening degree adjustment of the two branches respectively.

[0056] The first liquid guide branch is located in the middle liquid phase region of the extraction container, which is below the liquid surface and above the bottom low collection area. This region is mainly composed of soluble protein, collagen and flavor substances in the bone broth extraction process. It is less affected by the floating light phase and the bottom sediment, and is suitable as the source of the main circulating liquid phase.

[0057] The liquid intake position of the second liquid guide branch corresponds to the lower area of ​​the extraction container, but is located above the bottom slag discharge port. It is mainly used to participate in the mixing of liquid phase during the preheating stage and the initial stage of extraction, and to assist in the circulation of the lower liquid phase when needed.

[0058] The first and second liquid guiding branches do not directly draw liquid from the bottom of the extraction container, but instead extract the liquid phase from the middle and lower regions, respectively. This is because during bone broth extraction, floating oil and foam gradually form at the top of the extraction container, while bone residue, bone meal, and settled impurities gradually form at the bottom. The middle liquid phase is the main usable liquid phase. If the top light phase, bottom sediment, and middle liquid phase are all introduced into the external circulation heating circuit, it will not only easily cause foam entrainment, excessive oil emulsification, and filter blockage, but also exacerbate the contamination of the heat exchange surface. Therefore, in this embodiment, the main circulation target of the external circulation heating circuit is limited to the liquid phase located between the floating light phase and the bottom sediment, and this portion of the liquid phase is preferentially extracted through the first liquid guiding branch. This is one of the essential differences between this embodiment and schemes that employ overall cooking, overall circulation, or unified oil separation after extraction.

[0059] Buffer filtering unit:

[0060] The buffer filtration unit is located between the clear liquid outlet unit and the circulation conveying unit, and is used to stabilize the flow of the outlet liquid phase, separate the gas and liquid, and pre-filter it.

[0061] The buffer filtration unit in this embodiment includes a flow stabilizing buffer section, a gas-liquid separation section, and a pre-filtration section connected in sequence.

[0062] The flow stabilizing buffer section is used to contain the liquid phase discharged from the first and second liquid guiding branches, and to reduce flow fluctuations caused by valve switching, liquid level fluctuations, and uneven release of aggregate liquid phase during the liquid guiding process. The flow stabilizing buffer section can adopt a buffer tank structure, which does not need to be very large, but must be able to form a liquid residence space for a short time to smooth the instantaneous fluctuations of the inflowing liquid phase.

[0063] The gas-liquid separation unit is located downstream of the flow stabilization buffer unit and is used to separate entrained bubbles and foam from the main liquid phase in the discharged liquid phase. The gas phase outlet of the gas-liquid separation unit is located at the top, and the liquid phase outlet is located at the bottom, so that entrained bubbles and foam separate upwards, while the more stable main liquid phase enters the pre-filtration unit from the bottom. The gas phase outlet of the gas-liquid separation unit is connected to the light phase bypass unit, and the separated foam and the oil phase that floats with the foam can be discharged separately through the light phase bypass unit.

[0064] The pre-filtration section is located between the gas-liquid separation section and the circulation conveying unit. It is used to trap bone debris particles, agglomerated impurities, and foam entrainments in the liquid phase. The pre-filtration section does not aim for fine filtration of the liquid phase; instead, it blocks larger bone debris particles, agglomerated impurities, and lumpy floating entrainments before they reach the circulation conveying unit. This reduces the risk of impeller jamming in the circulation conveying unit, blockage of the external heat exchanger flow channels, and localized blockage at the return end. The pre-filtration section can employ filter cartridges, filter baskets, or wide-channel pre-filters that are easy to disassemble and clean or flush online.

[0065] Differential pressure detection points are installed on the inlet and outlet sides of the pre-filtration section, respectively, and the differential pressure detection unit obtains the differential pressure detection values ​​on both sides of the pre-filtration section based on these points. Since the pre-filtration section is the part of the buffer filtration unit where the main flow resistance changes occur, the differential pressure detection values ​​on both sides of the pre-filtration section can characterize the filtration load status of the buffer filtration unit.

[0066] To facilitate online cleaning of the pre-filtration section, switching valves are installed on both the inlet and outlet sides of the pre-filtration section, and a cleaning branch is connected between the two ends of the pre-filtration section. A cleaning control valve is installed on the cleaning branch. When the external circulation heating circuit is in a low-flow or stopped state, the control unit first closes the relevant valves on the main flow path of the pre-filtration section, and then opens the cleaning branch, causing the cleaning fluid or return fluid to flow in reverse from the outlet side to the inlet side of the pre-filtration section, thereby flushing away bone debris particles and aggregated impurities adhering to the surface of the pre-filtration section.

[0067] Without using online backwashing, the pre-filter can be removed for offline cleaning after closing the valves before and after it. With this setup, the pre-filter can maintain continuous operation even in the later stages of extraction when impurities increase.

[0068] Circulating conveyor unit:

[0069] The circulating conveying unit is located downstream of the buffer filter unit and is used to provide circulating driving force for the external circulating heating circuit.

[0070] In this embodiment, the circulating conveying unit uses an adjustable speed conveying pump. The control unit can adjust the output of the circulating conveying unit via frequency conversion, so that the external circulating heating circuit operates with different circulation parameters in the preheating stage, extraction stage, and deep extraction stage.

[0071] The reason why the circulation conveying unit is located after the pre-filtration section, rather than directly at the outlet of the extraction container, is that if the circulation conveying unit directly extracts the liquid phase without buffering and pre-filtration, it is easily affected by bone residue, foam and instantaneous flow fluctuations. Buffering and filtration before entering the circulation conveying unit can make its inlet liquid phase more stable, thereby making the working state of the subsequent external heat exchange unit and reflux heating unit more stable.

[0072] External heat exchange unit:

[0073] The external heat exchange unit is located downstream of the circulation conveying unit and is used to indirectly heat the discharged liquid phase.

[0074] In this embodiment, the external heat exchange unit adopts an indirect heat exchange heating unit, and the heat exchange medium circuit and the bone broth extract circuit are isolated from each other. Specifically, a shell-and-tube heat exchanger can be used. The purpose of using an indirect heat exchange structure, instead of a direct heating structure inside the extraction container, is to avoid local high temperatures directly acting on the aggregate and the local liquid in the extraction container, thereby reducing problems such as local overheating, local charring, and uneven heating of the liquid surface area.

[0075] The external heat exchange unit is equipped with a third temperature detection unit and a fourth temperature detection unit at its inlet and outlet sides, respectively, so that the control unit can obtain the temperature changes of the liquid phase before and after the external heat exchange unit. The control unit can adjust the heat exchange intensity of the external heat exchange unit by adjusting at least one of the following methods: heat exchange medium flow rate, heat exchange medium temperature, or heat exchange medium supply duration, and thereby control the liquid phase temperature rise during a single external circulation.

[0076] It should be noted that in this embodiment, the external heat exchange unit does not rapidly increase the local liquid temperature through a single high-temperature shock. Instead, it gradually increases the overall temperature of the bulk liquid phase within the extraction container by circulating the heat exchange unit multiple times, while maintaining temperature uniformity. Therefore, the control logic focuses on controlling the temperature rise per cycle and the temperature difference between the upper and lower parts of the extraction container, rather than simply pursuing the highest possible heat exchanger outlet temperature. This operating mode reduces the risk of secondary emulsification of oils and violent agitation of proteins, which is a key difference between this embodiment and a conventional external circulation heating scheme that merely moves the heat source externally.

[0077] Bypass loop branch:

[0078] The bypass circulation branch is connected in parallel with the external heat exchange unit.

[0079] In this embodiment, the inlet of the bypass circulation branch is connected to the inlet side of the external heat exchange unit, and the outlet is connected to the outlet side of the external heat exchange unit. This allows a portion of the liquid phase to be directly returned to the reflux heating unit without passing through the external heat exchange unit. Regulating valves are installed on both the bypass circulation branch and the main heating branch via the external heat exchange unit. The control unit adjusts the opening of the two branches to distribute the liquid phase flow rate, thereby adjusting the actual proportion of liquid phase heated by the external heat exchange unit while maintaining the total circulation volume.

[0080] The reason for using a bypass circulation branch is that a high proportion of heated liquid phase reflux is not required at all stages of the bone broth extraction process. Especially when the temperature difference between the upper and lower parts of the extraction vessel is small, if all the liquid phase still passes through the external heat exchange unit, a large local temperature difference will form between the reflux liquid phase and the main liquid phase in the extraction vessel, which will easily aggravate liquid phase turbulence and disturbance of the upper light phase. By setting up a bypass circulation branch, the temperature rise of each cycle can be reduced while maintaining the overall circulation, so that the external circulation heating circuit has both heat exchange function and gentle mixing function.

[0081] Reflux heating unit:

[0082] The reflux heating unit is circumferentially connected to the upper part of the extraction container and is used to return the liquid phase heated by the external heat exchange unit to the extraction container.

[0083] In this embodiment, multiple reflux ends of the reflux heating unit are distributed circumferentially along the upper part of the extraction container, with the reflux direction facing the inner wall of the extraction container and extending downwards. This allows the reflux liquid phase to first flow down the inner wall of the extraction container after entering it, and then flow through the liquid phase circulation channel to the area where the aggregate receiving unit is located. The purpose of this arrangement is to avoid the high-temperature reflux liquid directly impacting the aggregate accumulation area, reducing large-scale agitation of the aggregate, secondary lifting of aggregate residue, and violent grease entrainment.

[0084] Compared to directly returning the heated liquid phase to the central area of ​​the aggregate, this embodiment uses an inner wall-guided return path to allow the return liquid phase to undergo a wall-based slow release and velocity attenuation before entering the aggregate area, thus balancing heat transfer efficiency and liquid phase stability. The liquid phase at the top of the extraction container flows down the inner wall, then passes through the periphery of the aggregate receiving unit and exchanges with the central area, ultimately forming a stable cycle with the central liquid phase. This ensures that the central liquid phase remains the primary circulating component, while the top lighter phase and bottom sediment are treated separately within their respective areas.

[0085] The light phase bypass unit is connected to the upper liquid surface area of ​​the extraction container and is used to remove the floating oil and foam formed during the extraction process from the extraction container.

[0086] In this embodiment, the light phase bypass unit includes a light phase outlet branch communicating with the upper liquid surface area of ​​the extraction container, a conduction control component disposed on the light phase outlet branch, and a light phase temporary storage unit communicating with the light phase outlet branch. The conduction control component on the light phase outlet branch can be any one of an electric valve, a pneumatic valve, or a solenoid valve. The light phase temporary storage unit is used to temporarily store the floating oil, foam, and a small amount of liquid phase carried out with the foam from the extraction container, so as to facilitate subsequent oil-water separation, recovery, or separate treatment.

[0087] The light phase bypass unit does not separate the oil only after extraction is complete; instead, it intermittently removes the floating oil and foam formed in the upper liquid surface area during extraction. This design is because, during bone broth extraction, if the upper light phase remains for an extended period and participates in the main circulation, it is easily entrained by the circulation transport unit and reflux disturbances, forming finer oil droplets and foam. This increases emulsification, making subsequent oil separation difficult and deteriorating the stability of the external circulation of the main liquid phase. By separately removing the light phase from the main circulation during extraction, the external circulation heating circuit can primarily handle the intermediate liquid phase, reducing oil bubble interference in the external circulation system from the source.

[0088] The control unit can control the light phase outlet branch to open intermittently based on the detection results of the first temperature detection unit, preset time conditions, or the detection results of the liquid level detection unit.

[0089] The preset time condition is used to ensure that the light phase bypass unit is activated intermittently during the extraction process, so as to promptly remove the accumulated light phase from the upper part. The detection results of the liquid level detection unit are used to determine whether there is an increase in floating oil or foam accumulation in the upper liquid surface area. The detection results of the first temperature detection unit can be used to help determine whether the temperature in the upper area is abnormal due to the accumulation of light phase. The reason for using intermittent operation instead of continuous operation is that the light phase to be removed is mainly the upper accumulated light phase. If a large amount is continuously discharged, it is easy to remove too much of the main liquid phase at the same time, affecting the liquid level in the extraction container and the extraction efficiency.

[0090] The sludge discharge unit is connected to the bottom of the extraction container and is used to remove bone residue and sedimented impurities deposited at the bottom.

[0091] In this embodiment, the sludge discharge unit includes a sludge collection branch connected to the bottom of the extraction container, a discharge control device disposed on the sludge collection branch, and a sludge temporary storage unit connected to the sludge collection branch. The discharge control device can be any one of an electric valve, a pneumatic valve, or a solenoid valve. The inlet of the sludge collection branch is located at or near the lowest part of the low-level collection area at the bottom of the extraction container, so that bone residue and sedimented impurities deposited at the bottom preferentially enter the sludge collection branch under low disturbance conditions.

[0092] Bone meal, fine bone residue, aggregated sediment, and some high-density deposits in the low-level collection area at the bottom of the extraction container will gradually accumulate at the bottom during the extraction process. If not treated in time, these deposits will be stirred up again during subsequent liquid phase disturbances and enter the liquid guiding branch or pre-filtration section, increasing the filtration load and the risk of clogging.

[0093] In this embodiment, the control unit is used to open the discharge control component when the external circulation heating circuit is in a low flow state, a stop flow state, or a light phase bypass unit is closed, so as to discharge the bone residue and settled impurities at the bottom of the extraction container. The reason for choosing to discharge the residue in a low flow state or a stop flow state is that the overall disturbance inside the extraction container is smaller at this time, and the bottom sediment is in a more obvious settling and aggregation state, so it is not easy to carry away a large amount of the main liquid phase when discharged; while discharging the residue when the light phase bypass unit is closed can avoid excessive liquid level fluctuations caused by simultaneous top and bottom discharge.

[0094] It should be noted that the sludge discharge unit in this embodiment does not share a liquid guiding path with the main circulation, but is independently located at the bottom of the extraction container. This design ensures that the bottom sludge does not enter the main circulation, but is discharged through a separate path, thus achieving a three-phase separation logic together with the upper light phase bypass unit: the top light phase does not enter the main circulation, the bottom sludge does not enter the main circulation, and the intermediate liquid phase enters the main circulation. This three-phase separation logic is a key difference between this embodiment and traditional overall cooking, overall circulation, or unified separation after extraction schemes.

[0095] The control unit is connected to the circulating conveying unit, the external heat exchange unit, the light phase bypass unit and the sludge discharge unit, and is also connected to the first temperature detection unit, the second temperature detection unit, the third temperature detection unit, the fourth temperature detection unit, the flow detection unit, the differential pressure detection unit and the liquid level detection unit.

[0096] In this embodiment, the control unit can be implemented using an industrial controller or a programmable controller. After collecting the detection results of each detection unit, it controls the conduction control component, the discharge control component, the rotation speed of the circulating conveying unit, and the supply of heat exchange medium to the external heat exchange unit.

[0097] To facilitate the explanation of the control method in this embodiment, the following parameters are defined:

[0098] The temperature difference between the upper and lower liquid phases in the extraction vessel is ;'

[0099] in, To extract the temperature difference between the top and bottom of the container, The temperature of the upper liquid phase is obtained by the first temperature detection unit. This refers to the temperature of the lower liquid phase detected by the second temperature detection unit. The single temperature rise of the liquid phase before and after the external heat exchange unit is... ;

[0100] in, For a single external circulation temperature rise in the liquid phase, The outlet liquid temperature of the external heat exchange unit is obtained by the fourth temperature detection unit. The temperature measured by the third temperature detection unit is the inlet liquid temperature of the external heat exchange unit. The pressure difference across the pre-filtration section is... ;

[0101] in, The pressure difference across the pre-filtration section. The inlet pressure of the pre-filtration section, This refers to the outlet pressure of the pre-filtration section. The flow rate percentage of the bypass circulation branch is... ;

[0102] in, To account for the traffic share of bypass circulation branches, To bypass the circulating branch flow, This refers to the liquid phase flow rate through the external heat exchange unit.

[0103] The parameters described above illustrate how the control unit coordinates the system's control based on temperature difference, single temperature rise, pressure difference, and flow rate ratio. Those skilled in the art can establish corresponding control programs based on these parameters.

[0104] In this embodiment, the first circulation parameter and the second circulation parameter each include at least two of the following: the output of the circulation delivery unit, the proportion of liquid phase flowing through the external heat exchange unit, and the heat exchange intensity of the external heat exchange unit.

[0105] The first cycle parameter corresponds to the preheating stage, which aims to improve the uniformity of the liquid phase temperature field in the extraction container; the second cycle parameter corresponds to the extraction stage, which aims to maintain the extraction temperature while avoiding excessive temperature rise in a single cycle.

[0106] The preset time condition is used to limit the intermittent opening timing of the light phase output branch, and its determination is mainly based on the formation rhythm of floating oil and foam during the bone broth extraction process.

[0107] During the preheating stage, the control unit simultaneously activates the first and second liquid guiding branches, allowing the liquid phases in the middle and lower regions of the extraction container to participate in the external circulation. At this time, the control unit controls the circulation delivery unit to operate according to the first circulation parameters and controls the external heat exchange unit to operate at a limited heat exchange intensity, thus... It remains within the preset range for a single temperature rise.

[0108] At the same time, the control unit controls the bypass circulation branch to maintain a certain flow rate ratio to avoid all circulating liquid phases experiencing a large single temperature rise, which could cause local overheating.

[0109] During this stage, the reflux heating unit refluxes the heated liquid phase from the top of the extraction container along the inner wall, gradually homogenizing the overall temperature field inside the extraction container.

[0110] The reason for simultaneously activating the first and second liquid guiding branches during the preheating stage is that the temperature of the lower liquid phase is usually lower in the initial stage. If only the middle liquid phase is drawn out, the lower liquid phase will heat up relatively slowly, which may lead to a large temperature difference between the upper and lower parts of the extraction vessel for a long period of time. By having both the middle and lower liquid phases participate in the preheating, the overall temperature equilibrium time can be shortened.

[0111] Once the extraction container reaches the predetermined extraction temperature range and enters the stable extraction stage, the control unit controls the first liquid guiding branch to remain open and reduces the liquid guiding volume of the second liquid guiding branch, so that the main circulation object gradually turns into the main liquid phase in the central region.

[0112] The reason for this design is that after entering the stable extraction stage, the lower area gradually becomes an area where sediment and settled impurities are more likely to accumulate. If a large proportion of the lower liquid is maintained for a long time, it will increase the risk of sediment entering the buffer filtration unit and the pre-filtration section.

[0113] During the extraction phase, the control unit mainly relies on adjust Size:

[0114] when A larger temperature indicates uneven temperature distribution in the upper and lower parts of the extraction container, causing the control unit to lower its temperature. To increase the proportion of liquid phase flowing through the external heat exchange unit, thereby enhancing heat supply;

[0115] when When the temperature is lower, it indicates that the temperature distribution in the upper and lower parts of the extraction container is relatively uniform, and the control unit can increase its speed. This reduces the heating amplitude of the liquid phase in a single cycle, allowing the cycle to perform more of a gentle mixing function rather than a strong heating function.

[0116] During this stage, the light phase bypass unit is opened intermittently to remove the top floating oil and foam from the extraction container; the sludge discharge unit is opened briefly during intermittent flow stoppages or low flow rates to remove the bottom sludge. In this way, the middle liquid phase in the extraction container is always used as the main circulating liquid phase, while the top light phase and bottom sludge are treated through independent paths, avoiding the mixing of the three into the same main circulation.

[0117] During the deep heating phase, the control unit controls the external circulation heating circuit to operate alternately between circulation and static operation phases.

[0118] During the cyclic operation, the first liquid guiding branch remains open, and the second liquid guiding branch can be selectively opened or closed according to the pressure difference detection result. The external heat exchange unit continues to indirectly heat the middle liquid phase, and the reflux heating unit continues to reflux along the inner wall of the extraction container.

[0119] During the static operation period, the control unit reduces or stops the output of the circulating conveying unit, thereby limiting the disturbance of the liquid phase in the extraction container except for the discharge of the light phase and the sludge. This allows the soluble components inside the aggregate to continue to diffuse into the main liquid phase under lower disturbance conditions, while further stratifying and stabilizing the upper light phase and the bottom sludge.

[0120] The reason for alternating between circulating and static operation is that deep extraction of bone broth does not solely rely on vigorous agitation. While continuous high-disturbance circulation makes it easier to maintain the liquid phase temperature, it also easily leads to continuous entrainment of the light phase, repeated foam bursting and regeneration, and persistent suspension of bone residue. By introducing a static operation period during the deep extraction stage, it is possible to balance component diffusion, phase stability, and load control of the circulation system, resulting in a more stable extraction process in the later stages.

[0121] When the differential pressure detection unit detects When the first preset threshold is reached, the control unit reduces the output of the circulating conveying unit to reduce the rate of increase in flow velocity and pressure difference before and after the pre-filtration section.

[0122] when When the second preset threshold is reached, the control unit controls the bypass circulation branch to be turned on, and starts the cleaning process of the pre-filter when the external circulation heating circuit is in a low flow state or a stop flow state.

[0123] When using the online cleaning method, the control unit first closes the main flow path of the pre-filter section, and then opens the cleaning branch, so that the cleaning liquid or return liquid flows in reverse from the outlet side of the pre-filter section to the inlet side; when using the offline cleaning method, the control unit closes the valves before and after the pre-filter section and then removes the pre-filter section for cleaning.

[0124] With the above setup, the pre-filtration unit can maintain sustainable operation even when faced with an increase in bone residue particles, aggregated impurities, and foam entrainment during the later stages of extraction.

[0125] It should be noted that the significance of differential pressure linkage control in this embodiment lies not only in preventing filter clogging, but also in ensuring that the main circulation object remains the central liquid phase. If the original pumping state is forcibly maintained after the differential pressure increases, impurities and light phase entrainment at the bottom are more easily drawn into the main circulation, thereby disrupting the three-phase splitting logic established in this embodiment. Therefore, this embodiment incorporates differential pressure control into the main circulation path switching logic to ensure that the operation of the central liquid phase main circulation, the top light phase bypass, and the bottom sediment separation is maintained even in the later stages of extraction.

[0126] In this embodiment, the first preset threshold, the second preset threshold, the first cycle parameter, the second cycle parameter, the preset time condition, and the predetermined extraction temperature range can all be calibrated before the equipment is put into use.

[0127] During calibration, based on the type of aggregate, size of aggregate blocks, bone-to-water ratio, target bone broth concentration, and target flavor intensity, an empty-load circulation test was first conducted using clean water and simulated loading to determine the basic flow range and reflux stability of each flow path. Then, actual aggregate was used for trial extraction, and the temperature difference between the upper and lower parts, single temperature rise, pressure difference growth rate, liquid level change, and light phase formation cycle at different stages were recorded. Finally, the corresponding thresholds and stage parameters were determined.

[0128] The first preset threshold is used to reflect the state in which the pre-filter section has begun to show a significant increase in load but can still maintain circulation, and the second preset threshold is used to reflect the state in which intervention is required through bypass switching and cleaning processes.

[0129] The first cycle parameter corresponds to the preheating stage, and its goal is to improve the uniformity of the liquid phase temperature field in the extraction container; the second cycle parameter corresponds to the extraction stage, and its goal is to maintain the extraction temperature while avoiding excessive temperature rise in a single cycle.

[0130] The preset time condition is used to limit the intermittent opening timing of the light phase output branch, and its determination is mainly based on the formation rhythm of floating oil and foam during the bone broth extraction process.

[0131] Through the above calibration method, those skilled in the art can set the control logic according to different aggregate types and product objectives without affecting the implementation of the basic technical concept of this embodiment.

[0132] In practical use, the treated aggregate is loaded into the aggregate holding unit, and then the extraction liquid is added to the extraction container so that the aggregate is submerged in the extraction liquid.

[0133] After the control unit is started, the control unit first puts the external circulation heating circuit into the preheating stage. The first liquid guiding branch and the second liquid guiding branch are simultaneously turned on. The circulation conveying unit introduces the middle liquid phase and part of the lower liquid phase into the buffer filtration unit. The outgoing liquid phase passes through the flow stabilization buffer section, the gas-liquid separation section and the pre-filtration section in sequence before entering the circulation conveying unit. It is then heated by the external heat exchange unit and refluxed from the top of the extraction container along the inner wall by the reflux heating unit, so that the temperature inside the extraction container gradually increases and tends to be uniform.

[0134] Once the extraction container reaches the predetermined extraction temperature range, the control unit initiates the extraction phase, gradually converting the main circulating phase to the central liquid phase. Simultaneously, the light phase bypass unit is activated intermittently to separately remove the top floating oil and foam. The sludge discharge unit is activated briefly at low flow rates or during periods of no flow to discharge the bottom sludge and settled impurities.

[0135] During this process, the control unit continuously adjusts according to... , , and The changes adjust the operating status of the circulation conveying unit, the external heat exchange unit, and the bypass circulation branch, so that the external circulation can provide the required heat without causing the light phase, sludge, and main liquid phase to remix.

[0136] Once the deep extraction stage begins, the control unit alternates between a circulating operation phase and a settling operation phase. During the circulating operation phase, heat is continuously supplied to maintain the circulation of the main liquid phase in the middle. During the settling operation phase, disturbances to the liquid phase, except for the removal of the light phase and the discharge of sludge, are restricted to promote system re-stratification and stabilization, and the continuous release of soluble components. After extraction, the main liquid phase can be separately exported from the extraction container for further processing, the floating oil in the light phase temporary storage unit can be recovered separately, and the bone residue and settled impurities in the sludge temporary storage unit can be centrally discharged.

[0137] It should be noted that this embodiment does not simply replace the heating method in the bone broth extraction process with heating outside the extraction container, nor does it perform oil-broth separation uniformly after extraction. Instead, it establishes a branched operation logic for the three-phase system of bone broth during the extraction process.

[0138] Specifically, in this embodiment, the central liquid phase is used as the main circulation object of the external circulation heating circuit, the top floating oil and foam are used as the processing objects of the light phase bypass unit, and the bottom bone residue and sedimented impurities are used as the processing objects of the sediment discharge unit. Through the slow release reflux of the inner wall of the reflux heating unit and the temperature difference and pressure difference of the control unit, the three are kept in separate zones and processed separately during the extraction process as much as possible.

[0139] Compared with the overall cooking or overall reflux schemes, this embodiment does not allow the top light phase and bottom sediment to enter the main circulation together, thereby reducing foam entrainment, excessive oil emulsification and impurity blockage.

[0140] Compared to the method of uniformly separating oil after extraction, this embodiment intermittently exports the light phase during the extraction process, reducing the impact of repeated entrainment of the light phase on the extraction process itself.

[0141] Compared to the approach of simply setting up a heat exchanger on the outside and directly returning the heating liquid to the inside of the container, this embodiment adopts a method of upper circumferential dispersion and downward flow along the inner wall, so that the heating liquid phase is slowly released before entering the aggregate area, thereby avoiding local high temperature impact and violent turbulence in the aggregate area.

[0142] Therefore, the technical difference in this embodiment is not the replacement of a single component, but rather the construction of a collaborative flow path and control method based on the different states and processing requirements of the top light phase, the middle main liquid phase, and the bottom sediment during the bone broth extraction process.

[0143] The working principle of this application is as follows: After the aggregate is loaded into the aggregate receiving unit, the extraction liquid is added into the extraction container. The control unit first controls the external circulation heating circuit to enter the preheating state, so that the first and second liquid guiding branches in the clear liquid discharge unit discharge the liquid phase in the middle and lower regions of the extraction container. The discharged liquid phase passes through the flow stabilization buffer section, gas-liquid separation section and pre-filtration section of the buffer filtration unit in sequence and then enters the circulation conveying unit. Under the action of the circulation conveying unit, it flows into the external heat exchange unit for indirect heating, and then flows back from the top of the extraction container through the reflux heating unit. The reflux liquid phase flows down along the inner wall of the extraction container and then enters the area where the aggregate receiving unit is located, thus forming a top-down circulating heat exchange path in the extraction container, so that the main liquid phase in the middle is continuously heated and exchanges heat with the aggregate and extracts components. During the extraction process, the control unit controls the temperature difference between the upper and lower parts of the extraction container, the single temperature rise before and after the external heat exchange unit, the pressure difference before and after the pre-filtration section and the flow rate change in the external circulation heating circuit. The system adjusts the output of the circulating conveying unit, the heat exchange intensity of the external heat exchange unit, and the flow rate ratio of the bypass circulation branch. This ensures that the external circulation heating circuit meets the extraction temperature requirements while limiting excessive temperature rise in a single cycle, preventing the top light phase and bottom sediment from being repeatedly drawn into the main circulation. Simultaneously, the light phase bypass unit intermittently removes floating oil and foam formed in the upper liquid surface area of ​​the extraction container, while the sediment discharge unit discharges bone residue and settled impurities accumulated at the bottom of the extraction container under low flow or stop flow conditions. This allows the upper light phase, the middle main liquid phase, and the bottom sediment to be processed along different paths during the extraction process. In the later stages of extraction, the control unit causes the external circulation heating circuit to alternate between circulating and static operation periods. This ensures that the main liquid phase is kept warm and circulated while providing relatively stable conditions for the diffusion of soluble components from the aggregate into the liquid phase. Ultimately, this achieves stable heating of the main liquid phase, separate removal of floating oil and foam, timely separation of settled impurities, and uniform control of the overall temperature field during the bone broth extraction process.

[0144] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An external heat exchange circulation heating system for bone broth extraction, characterized in that, include: An extraction container, an aggregate receiving unit disposed within the extraction container, an external circulation heating circuit, a light phase bypass unit, a sludge discharge unit, and a control unit; The external circulation heating circuit includes a clear liquid outlet unit, a buffer filtration unit, a circulation conveying unit, an external heat exchange unit, a bypass circulation branch, and a reflux heating unit; The clear liquid exporting unit is connected to at least one of the middle and lower regions of the extraction container. The buffer filtration unit is located between the clear liquid exporting unit and the circulation conveying unit. The output end of the circulation conveying unit is connected to the input end of the external heat exchange unit. The output end of the external heat exchange unit is connected to the upper part of the extraction container via the reflux heating unit. The bypass circulation branch is connected in parallel with the external heat exchange unit. The light phase bypass unit is connected to the upper liquid surface area of ​​the extraction container and is used to export the floating oil and foam formed during the extraction process from the extraction container. The sludge discharge unit is connected to the bottom of the extraction container and is used to remove bone residue and sedimented impurities deposited at the bottom during the extraction process. The control unit is connected to the circulating conveying unit, the external heat exchange unit, the light phase bypass unit, and the sludge discharge unit, respectively. It is also connected to a first temperature detection unit located at the top of the extraction container, a second temperature detection unit located at the bottom of the extraction container, a flow detection unit located in the external circulating heating circuit, and a differential pressure detection unit located on both sides of the buffer filtration unit. Based on the detection results of the first and second temperature detection units, the circulating flow rate, and the filtration differential pressure, the control unit controls the switching of the circulation path of the external circulating heating circuit, the activation of the light phase bypass unit, and the activation of the sludge discharge unit.

2. The external heat exchange circulation heating system for bone broth extraction according to claim 1, characterized in that, The clear liquid export unit includes a first liquid guiding branch connected to the middle region of the extraction container and a second liquid guiding branch connected to the lower region of the extraction container. The first liquid guiding branch and the second liquid guiding branch are respectively provided with a flow control element. The control unit is used to control the first liquid guiding branch and the second liquid guiding branch to be simultaneously connected during the preheating stage, to control the first liquid guiding branch to remain connected and reduce the liquid guiding volume of the second liquid guiding branch during the extraction stage, and to control the second liquid guiding branch to be closed when the detection value of the differential pressure detection unit reaches a preset threshold.

3. The external heat exchange circulation heating system for bone broth extraction according to claim 2, characterized in that, The buffer filtration unit includes a flow stabilization buffer section, a gas-liquid separation section and a pre-filtration section connected in sequence. The gas phase outlet of the gas-liquid separation section is connected to the light phase bypass unit. The pre-filtration section is located between the gas-liquid separation section and the circulation conveying unit to intercept bone residue particles, agglomerated impurities and foam entrainment in the discharged liquid phase.

4. The external heat exchange circulation heating system for bone broth extraction according to claim 3, characterized in that, The differential pressure detection units are respectively located on the inlet side and the outlet side of the pre-filtration section; The control unit is used to reduce the output of the circulating conveying unit when the detection value of the differential pressure detection unit reaches a first preset threshold, control the bypass circulation branch to be turned on when the detection value of the differential pressure detection unit reaches a second preset threshold, and start the cleaning process of the pre-filter when the external circulation heating circuit is in a low flow state or a stop flow state.

5. The external heat exchange circulation heating system for bone broth extraction according to claim 4, characterized in that, The bypass circulation branch bypasses the external heat exchange unit and is connected to the inlet and outlet sides of the external heat exchange unit, respectively; The control unit is used to increase the flow rate of the bypass circulation branch when the temperature difference between the first temperature detection unit and the second temperature detection unit is lower than a first preset threshold, and to increase the proportion of liquid phase flowing through the external heat exchange unit when the temperature difference is higher than a second preset threshold.

6. The external heat exchange circulation heating system for bone broth extraction according to claim 5, characterized in that, The external heat exchange unit is an indirect heat exchange heating unit, and its heat exchange medium circuit is isolated from the bone broth extract circuit. The external heat exchange unit is provided with a third temperature detection unit and a fourth temperature detection unit at its inlet and outlet sides, respectively. The control unit is used to adjust the heat exchange intensity of the external heat exchange unit according to the detection results of the third temperature detection unit and the fourth temperature detection unit, so as to limit the temperature rise of the liquid phase flowing back into the extraction container after a single external circulation.

7. The external heat exchange circulation heating system for bone broth extraction according to claim 6, characterized in that, The reflux heating unit is circumferentially connected to the upper part of the extraction container, and causes the liquid phase heated by the external heat exchange unit to reflux downward along the inner wall of the extraction container. A liquid phase circulation channel is formed between the aggregate receiving unit and the inner wall of the extraction container, so that the reflux liquid phase flows down the inner wall from the top of the extraction container and then flows through the area where the aggregate receiving unit is located.

8. The external heat exchange circulation heating system for bone broth extraction according to claim 7, characterized in that, The light phase bypass unit includes a light phase outlet branch connected to the upper liquid surface area of ​​the extraction container, a conduction control device disposed on the light phase outlet branch, and a light phase temporary storage unit connected to the light phase outlet branch. The control unit is used to control the light phase outlet branch to open intermittently according to the detection result of the first temperature detection unit, preset time conditions, or liquid level detection result, so as to separately export floating oil and foam from the extraction container.

9. The external heat exchange circulation heating system for bone broth extraction according to claim 8, characterized in that, The sludge discharge unit includes a sludge collection branch connected to the bottom of the extraction container, a discharge control device provided on the sludge collection branch, and a sludge temporary storage unit connected to the sludge collection branch. The control unit is used to control the discharge control element to open when the external circulation heating circuit is in a low flow state, a stop flow state, or the light phase bypass unit is closed, so as to export the bone residue and sedimented impurities deposited at the bottom of the extraction container.

10. The external heat exchange circulation heating system for bone broth extraction according to claim 9, characterized in that, The control unit is used to perform phased cyclic heating control, which includes a preheating stage, an extraction stage, and a deep extraction stage. During the preheating stage, the external circulation heating circuit is controlled to operate according to the first circulation parameters to improve the uniformity of the liquid phase temperature field in the extraction container. During the extraction stage, the external circulation heating circuit is controlled to operate according to the second circulation parameters so that the temperature difference between the first temperature detection unit and the second temperature detection unit is maintained within a preset range. During the deep extraction stage, the external circulation heating circuit is controlled to operate alternately with a circulation run and a static run, and during the static run, liquid phase disturbances in the extraction container are restricted except for the export of light phase and the discharge of sludge.

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