Clostridium autoethanogenum protein drying process heat exchanger

Abstract

The present disclosure relates to the technical field of heat exchange, and particularly relates to a Clostridium ethanoligenes protein drying process heat exchange device. The heat exchanger body of the present disclosure is provided with multiple heat exchange pipes, multiple steam input valves are arranged on a steam input pipe, the multiple steam input valves are connected to input ends of the multiple heat exchange pipes, multiple condensed water output valves are arranged on a condensed water output pipe, the multiple condensed water output valves are connected to output ends of the heat exchange pipes, a circulating pipe group comprises a gas circulating pipeline, a liquid circulating pipeline and a vapor-liquid separation tank, the vapor-liquid separation tank is provided with a condensed water inlet, a gas outlet and a liquid outlet, a drainage end of the condensed water output pipe is connected to the condensed water inlet, one end of the gas circulating pipeline is connected to the gas outlet, one end of the liquid circulating pipeline is connected to the liquid outlet, and the opposite end is connected to a downstream liquid supply equipment. Through the technical scheme of the present disclosure, water hammer phenomenon of the heat exchanger liquid outlet can be effectively eliminated, and condensed water can be fully recycled.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of heat exchange, in particular to a Clostridium ethanoligenes protein drying process heat exchange device. BACKGROUND

[0002] Industrial tail gas fermentation to produce ethanol is a new technology that uses carbon monoxide as a carbon source to produce ethanol through microbial fermentation. After distillation to extract ethanol from the fermentation wastewater, the wastewater contains a certain amount of microbial protein, which greatly increases the difficulty of sewage treatment. At the same time, the microbial protein contained in the wastewater is single in composition and high in crude protein content, and is a high-value protein feed that can be widely used in aquaculture and livestock feeding. The microbial protein powder can replace a part of fish meal and be applied to the feed industry to reduce the dependence on marine fish for high-grade protein feed, which has great environmental and economic significance. The protein powder can be obtained through processes such as centrifugal concentration and drying tower drying.

[0003] In the drying process, steam heat exchangers are used to heat the incoming natural air, and the heated air enters the top of the drying tower and flows downstream with the atomized thick mash to dry the thick mash into protein powder. However, during the heat exchange process using steam heat exchangers, it is found that the condensate outlet is mixed with unsaturated steam, and the water hammer phenomenon is serious. CONTENT OF THE UTILITY MODEL

[0004] The present disclosure aims to at least solve one of the technical problems existing in the prior art or related art.

[0005] To this end, the present disclosure provides a Clostridium ethanoligenes protein drying process heat exchange device, which comprises a heat exchanger body, a steam input pipe group, a steam input pipe, a condensate output pipe and a circulation pipe group. The heat exchanger body has a plurality of heat exchange pipes therein, the heat exchange pipes have input ends and output ends, a plurality of steam input valves are provided on the steam input pipe, and the plurality of steam input valves are connected to the plurality of input ends. A plurality of condensate output valves are provided on the condensate output pipe, and the plurality of condensate output valves are connected to the output ends. The steam input pipe group is used to input steam to the steam input pipe, wherein, The circulation pipe group comprises a gas circulation pipe, a liquid circulation pipe and a vapor-liquid separation tank. The vapor-liquid separation tank has a condensate inlet, a gas outlet and a liquid outlet. The drainage end of the condensate output pipe is connected to the condensate inlet. One end of the gas circulation pipe is connected to the gas outlet, and the opposite end is connected to a downstream gas supply equipment. One end of the liquid circulation pipe is connected to the liquid outlet, and the opposite end is connected to a downstream liquid supply equipment.

[0006] In an embodiment, the plurality of heat exchange tubes are arranged into a first group of heat exchange tubes and a second group of heat exchange tubes, the steam input pipe and the condensed water output pipe are connected to the first group of heat exchange tubes, the second group of heat exchange tubes are arranged at one side of the air inlet of the heat exchanger body, the second group of heat exchange tubes comprise air inlet heat exchange tubes and liquid inlet heat exchange tubes, the gas circulation pipeline is connected to the air inlet heat exchange tubes through an air inlet valve, and the liquid circulation pipeline is connected to the liquid inlet heat exchange tubes through a liquid inlet valve.

[0007] In an embodiment, a hot water tank and a hot water pump are arranged on the liquid circulation pipeline, the hot water pump is arranged at one side of a hot water outlet of the hot water tank, and the hot water pump is used to provide a force for inputting liquid from the hot water tank into the liquid inlet heat exchange tubes.

[0008] In an embodiment, a first group of drain valves are arranged on the liquid circulation pipeline, and the first group of drain valves are arranged between the steam-liquid separation tank and the hot water tank.

[0009] In an embodiment, the first group of drain valves comprise a first drain valve and two first stop valves, and the first drain valve is arranged between the two first stop valves.

[0010] In an embodiment, a liquid circulation bypass is arranged on the liquid circulation pipeline, the liquid circulation bypass has a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are connected to the liquid circulation bypass, the first group of drain valves are arranged between the liquid inlet and the liquid outlet, and a third stop valve is arranged on the liquid circulation bypass.

[0011] In an embodiment, the steam input pipe group comprises a steam input main pipe and a steam input valve group, the steam input main pipe is connected to the steam input pipe, the steam input valve group is arranged on the steam input main pipe, and the steam input valve group is used to control the amount of steam input from the steam input main pipe into the steam input pipe.

[0012] In an embodiment, the steam input valve group comprises a flow meter and two second stop valves, and the flow meter is arranged between the two second stop valves.

[0013] In an embodiment, a steam input bypass is further included, the steam input bypass comprises a bypass inlet and a bypass outlet, the bypass inlet and the bypass outlet are connected to the steam input main pipe, the steam input valve group is arranged between the bypass inlet and the bypass outlet, and a fourth stop valve is arranged on the steam input bypass.

[0014] In a feasible implementation, the liquid circulation pipeline is further provided with a CIP tank connecting pipeline.

[0015] The above description is only a summary of the technical solutions provided by the present disclosure. In order to enable one skilled in the art to better understand the technical means of the present disclosure, the content of the specification can be implemented, and in order to make the above and other characteristics and effects of the present disclosure more obvious and easy to understand, the following will describe the embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure together with the specification.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for purposes of illustration only and are not intended to be limiting of the present application. In the drawings, the same reference numbers indicate the same or similar components throughout several views. The drawings are as follows: Figure 1 It is one of the overall structure schematic diagrams of the present disclosure; Figure 2 It is the overall structure schematic diagram of the present disclosure Figure 1 It is a partial enlarged structure schematic diagram of A in the present disclosure; Figure 3 It is a partial enlarged structure schematic diagram of B in the present disclosure Figure 1 Figure 4 It is a structure schematic diagram of the vapor-liquid separation tank of the present disclosure; Figure 5 It is the second overall structure schematic diagram of the present disclosure.

[0019] Among them, Figures 1 to 5 The correspondence between the reference signs and the component names in the present disclosure is as follows: 100 - first heat exchange pipe group; 200 - second heat exchange pipe group; 201 - inlet gas heat exchange pipe; 202 - inlet liquid heat exchange pipe; 300 - CIP tank connecting pipeline; ​1 - heat exchanger body; 2 - steam input pipe group; 221 - flow meter; 222 - second stop valve; 21 - steam input main pipe; 22 - steam input valve group; 3 - steam input pipe; 31 - steam input valve; 4 - condensed water output pipe; 41 - condensed water output valve; 51 - gas circulation pipe; 52 - liquid circulation pipe; 521 - hot water tank; 522 - hot water pump; 53 - vapor-liquid separation tank; 531 - condensed water inlet; 532 - gas outlet; 533 - liquid outlet; 6 - first trap valve group; 61 - first trap valve; 62 - first stop valve; 7 - liquid circulation bypass; 8 - steam input bypass; 9 - third stop valve; 10 - fourth stop valve. DETAILED DESCRIPTION

[0020] In order to enable a more complete understanding of the above-mentioned objects, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other manners different from those described herein; obviously, the embodiments described in the specification are only a part of the embodiments of the present disclosure, and not all the embodiments.

[0022] At present, industrial tail gas fermentation to produce ethanol is a new technology for producing ethanol by biological fermentation of bacteria with carbon monoxide as carbon source. After distillation to extract ethanol from fermentation wastewater, the wastewater contains a certain amount of bacterial protein, which greatly increases the difficulty of sewage treatment. At the same time, the bacterial protein contained in the wastewater is single in composition and high in crude protein content, which is a high-value protein feed that can be widely used in aquaculture and livestock feeding. Bacterial protein powder can replace a part of fish meal and be applied to the feed industry to reduce the dependence of high-grade protein feed on marine fish, which has great environmental protection and economic significance; the protein powder can be obtained by centrifugal concentration and drying tower drying process.

[0023] In the drying process, steam heat exchanger is needed to heat the inhaled natural air, and the heated air enters the top of the drying tower and flows down with the atomized thick mash liquid to dry the thick mash liquid into protein powder. However, during the heat exchange process using the steam heat exchanger, it is found that the condensed water outlet is mixed with unsaturated steam, and the water hammer phenomenon is serious.

[0024] Based on this, the ethanol clostridium protein drying process heat exchange device provided by the embodiment of the present disclosure can effectively avoid the water hammer phenomenon caused by the mixing of unsaturated steam at the condensate water outlet of the conventional heat exchanger, effectively separate the condensate water and unsaturated steam at the outlet of the heat exchanger, relieve the "air hammer" phenomenon to protect the pipeline, and utilize the waste heat of the steam and condensate water of the steam-water separator, thereby increasing the heat exchange efficiency of the steam heat exchanger. In addition, the condensate water of the gas-liquid separator can directly enter the downstream equipment for use, for example, a CIP tank, thereby saving the heating time of the CIP tank and achieving energy saving and consumption reduction.

[0025] The ethanol clostridium protein drying process heat exchange device will be described in detail through specific embodiments as follows: Referring to FIGS. 1, 2 and 3, Figure 1 and 5 The present disclosure provides an ethanol clostridium protein drying process heat exchange device, which comprises a heat exchanger body 1, a steam input pipe group 2, a steam input pipe 3, a condensate water output pipe 4 and a circulation pipe group. The heat exchanger body 1 has a plurality of heat exchange pipes therein, and the heat exchange pipes have input ends and output ends. The steam input pipe 3 is provided with a plurality of steam input valves 31, and the plurality of steam input valves 31 are connected to the plurality of input ends. The condensate water output pipe 4 is provided with a plurality of condensate water output valves 41, and the plurality of condensate water output valves 41 are connected to the output ends. The steam input pipe group 2 is used for inputting steam to the steam input pipe 3. The circulation pipe group comprises a gas circulation pipeline 51, a liquid circulation pipeline 52 and a gas-liquid separation tank 53. The gas-liquid separation tank 53 has a condensate water inlet 531, a gas outlet 532 and a liquid outlet 533. The drainage end of the condensate water output pipe 4 is connected to the condensate water inlet 531. One end of the gas circulation pipeline 51 is connected to the gas outlet 532, and the opposite end is connected to a downstream gas supply equipment. One end of the liquid circulation pipeline 52 is connected to the liquid outlet 533, and the opposite end is connected to a downstream liquid supply equipment.

[0026] Specifically, upstream saturated steam is input into steam input pipe 3 via steam input pipe group 2 and enters heat exchange pipe through steam input valve 31. Natural air is introduced from the air inlet side by a fan and generates hot air through the heat exchange pipe. The steam in the heat exchange pipe forms condensate. The condensate and unsaturated steam are discharged into condensate output pipe 4 through condensate output valve 41 and then input into vapor-liquid separator 53 through condensate inlet 531 for vapor-liquid separation. The separated dry steam enters the downstream equipment for heating gas through the gas circulation pipeline 51 for recycling; the separated hot water enters the downstream equipment for hot water through the liquid circulation pipeline 52 for recycling. For example, in the industrial tail gas fermentation to ethanol process, the by-product is protein powder, which comes from the fermentation mash. Drying protein powder requires separation and concentration of the mash before it can be dried into protein powder. The separation and concentration centrifuge needs to be cleaned by CIP. The CIP tank includes a hot water tank, an alkali tank, and an acid tank. The medium in the CIP tank needs to be heated to 60℃-80℃ before the centrifuge can be cleaned by CIP. In this disclosure, the separated hot water can be directly fed into the CIP tank, and the hot water can be directly replenished to the hot water tank. Alternatively, when preparing acid and alkali in the acid and alkali tank, diluted concentrated acid and concentrated alkali can be directly introduced to prepare new acid and alkali solutions, saving the heating time of the CIP tank, improving the timeliness of the centrifuge CIP cleaning, protecting the equipment, and improving the efficiency of centrifugal concentration.

[0027] Inhaled natural air from the surrounding Figure 1 The steam heat exchanger on the air inlet side first undergoes preheating via an independent hot water heat exchange valve group, then secondary preheating via an independent dry steam heat exchange valve group, and finally enters the heat exchange tubes described in this disclosure for heat exchange. Specifically, the heat exchange tubes of this disclosure can be configured with a total of 16 independent steam heat exchange valve groups (upper and lower). For example... Figure 5 As shown, heat exchange tubes are located at the top and bottom of the heat exchanger body 1, providing space for eight sets of heat exchange tubes. It is understood that a heat exchange tube body should also exist between the top and bottom sections, with gaps between each heat exchange tube to allow air passage and sufficient heat exchange by natural air. Specifically, the steam inlet pipe 3 and condensate outlet pipe 4 of this disclosure are both located outside the heat exchanger body 1 and connected to the inlet and outlet ends of the heat exchange tubes to ensure the stability of the heat exchange efficiency inside the heat exchanger. The number of steam inlet valves 31 and condensate outlet valves 41 is the same as the number of heat exchange tubes or the number of heat exchange tube interfaces. Multiple steam inlet valves 31 are connected in parallel to the steam inlet pipe 3, and multiple condensate outlet valves 41 are connected in parallel to the condensate outlet pipe 4.

[0028] By the embodiments of the present disclosure, the water hammer phenomenon caused by mixing of unsaturated steam in the condensate water outlet of the conventional heat exchanger can be effectively avoided. Not only the condensate water and the unsaturated steam at the outlet of the heat exchanger are effectively separated, and the phenomenon of "air hammer" is relieved to protect the pipeline, but also the waste heat of the steam and the condensate water in the steam-water separator is utilized, and the heat exchange efficiency of the steam heat exchanger is increased. In addition, the condensate water in the gas-liquid separator can directly enter the downstream equipment for use, for example, a CIP tank, so that energy consumption is reduced, and the heating time of the CIP tank is saved.

[0029] In some embodiments, the plurality of heat exchange tubes are arranged as a first heat exchange tube group 100 and a second heat exchange tube group 200, the steam input pipe 3 and the condensate water output pipe 4 are connected to the first heat exchange tube group 100, the second heat exchange tube group 200 is arranged on one side of the air inlet of the heat exchanger body 1, the second heat exchange tube group 200 includes an air inlet heat exchange tube 201 and a liquid inlet heat exchange tube 202, the gas circulation pipeline 51 is connected to the air inlet heat exchange tube 201 through an air inlet valve, and the liquid circulation pipeline 52 is connected to the liquid inlet heat exchange tube 202 through a liquid inlet valve.

[0030] In this embodiment, the second heat exchange tube group 200 of the present disclosure serves as a downstream device to be supplied with air and liquid, and realizes self-circulation of the condensate water and the unsaturated steam in the heat exchanger. The second heat exchange tube group 200 is located on the air inlet side, and the circulating waste heat saturated steam in the gas circulation pipeline 51 and the circulating hot water in the liquid circulation pipeline 52 are used to preheat the external natural air, so that the air inlet temperature is increased, and the load of the main heat exchange tube group is reduced.

[0031] In some embodiments, a hot water tank 521 and a hot water pump 522 are arranged on the liquid circulation pipeline 52, the hot water pump 522 is arranged on one side of a hot water outlet of the hot water tank 521, and the hot water pump 522 is used to provide a force for inputting the liquid flowing out of the hot water tank 521 into the liquid inlet heat exchange tube 202.

[0032] In this embodiment, the thermal system design of the liquid circulation pipeline significantly improves the stability and energy efficiency of the heat exchange system by integrating the hot water tank and the hot water pump. The hot water tank 521 serves as a heat storage unit and can store the recovered condensate water. The CIP tank can directly extract hot water from the hot water tank 521 to better ensure the utilization efficiency of the condensate water of the heat exchanger. The hot water pump 522 is located on the outlet side of the tank body, and forms a stable output pressure through frequency regulation, eliminates the pulsation phenomenon caused by gas-liquid mixing in the circulation pipeline, and reduces system vibration.

[0033] In some embodiments, a first trap valve group 6 is further included, the first trap valve group 6 is arranged on the liquid circulation pipeline 52, and the first trap valve group 6 is arranged between the steam-liquid separation tank and the hot water tank 521.

[0034] In this embodiment, the first drain valve group 6 is located downstream of the vapor-liquid separation tank 53, which can quickly drain the saturated condensed water and avoid the impact of two-phase flow on the hot water tank 521, thereby reducing the liquid level fluctuation in the tank. Specifically, the drain valve group can adopt a mechanical type of floating ball structure (such as a lever floating ball type), which can adapt to a pressure fluctuation of 0.2-0.8 MPa and ensure the stability of the inlet pressure of the hot water pump 522.

[0035] In some embodiments, the first drain valve group 6 includes a first drain valve 61 and two first stop valves 62, and the first drain valve 61 is arranged between the two first stop valves 62.

[0036] In this embodiment, the two first stop valves 62 form a physical isolation barrier, which can completely cut off the medium flow when the drain valve 61 is being repaired, thereby avoiding system downtime and ensuring continuous production. The double stop valve structure can adjust the pressure gradient between the valves, control the working back pressure of the drain valve within a desired range, and avoid valve core oscillation caused by flash steam. In terms of water hammer effect suppression, the buffer cavity formed by the valve group can absorb more than 80% of the pressure fluctuation, the pipeline vibration amplitude is greatly reduced, and the risk of equipment damage is significantly reduced.

[0037] In some embodiments, the liquid circulation pipeline 52 is provided with a liquid circulation bypass 7, the liquid circulation bypass 7 has a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are communicated with the liquid circulation bypass 7, the first drain valve group 6 is arranged between the liquid inlet and the liquid outlet, and the liquid circulation bypass 7 is provided with a third stop valve 9.

[0038] In this embodiment, when the main circulation pipeline 52 is blocked, the third stop valve 9 is opened to quickly switch to the bypass 7, thereby maintaining at least 70% of the designed flow rate and avoiding production interruption. The first drain valve group 6 realizes dynamic discharge of condensed water in the bypass, and forms a double protection with the drain valve in the main pipeline, thereby greatly reducing the occurrence rate of system water hammer. Closing the third stop valve 9 can isolate the bypass system, and the first drain valve group 6 can be maintained under pressure, thereby shortening the maintenance time.

[0039] In some embodiments, the steam input pipe group 2 includes a steam input main pipe 21 and a steam input valve group 22, the steam input main pipe 21 is connected to the steam input pipe 3, the steam input valve group 22 is arranged on the steam input main pipe 21, and the steam input valve group 22 is used to control the amount of steam input by the steam input main pipe 21 into the steam input pipe 3. In this embodiment, the steam input valve group 22 adopts a proportional regulating valve structure, which can realize stepless adjustment of the steam flow within a range of 0-100% opening degree, and the control accuracy is ±1.5%.

[0040] In some embodiments, the steam input valve group 22 includes a flowmeter 221 and two second stop valves 222, and the flowmeter 221 is arranged between the two second stop valves 222.

[0041] In this embodiment, the steam input valve group 22 realizes high precision of steam metering and reliability of the system through the cooperation of the flow meter and the double stop valve. The two second stop valves 222 form front and rear isolation sections, eliminating vortex interference caused by pipe bends or reducers, so that the measurement error of the flow meter 221 is greatly reduced. Closing the two second stop valves 222 can isolate the flow meter 221, supporting zero-point calibration or replacement without stopping production, thereby reducing maintenance time.

[0042] In some embodiments, a steam input bypass 8 is further included, the steam input bypass 8 comprising a bypass inlet and a bypass outlet, the bypass inlet and the bypass outlet being communicated with the steam input main pipe 21, the steam input valve group 22 being arranged between the bypass inlet and the bypass outlet, and a fourth stop valve 10 being arranged on the steam input bypass 8.

[0043] In this embodiment, when the steam input valve group 22 fails, the fourth stop valve 10 can be opened to quickly switch to the bypass 8, ensuring production continuity. The bypass and the main road form a pressure gradient adjustment, and the bypass automatically compensates for pressure fluctuations when the main road is abnormal, thereby improving the stability of the system pressure.

[0044] In some embodiments, the liquid circulation pipeline 52 is further provided with a CIP tank connection pipeline 300. In this embodiment, the liquid circulation pipeline 52 is configured with the CIP tank connection pipeline 300, so that the hot water separated by the vapor-liquid separation tank 53 in the liquid circulation pipeline 52 can be directly input into the CIP tank for recycling.

[0045] The first stop valve 62, the second stop valve 222, the third stop valve 9, and the fourth stop valve 7 of the present disclosure can be selected from pneumatic valves or solenoid valves.

[0046] In the present disclosure, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integral connection; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0047] In the description of the present disclosure, it needs to be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0048] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "a specific embodiment", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The above is only the preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A heat exchange device for drying Clostridium ethanol protein, characterized in that, The system includes a heat exchanger body, a steam inlet pipe assembly, a steam inlet pipe, a condensate outlet pipe, and a circulation pipe assembly. The heat exchanger body contains multiple heat exchange tubes, each with an inlet and an outlet end. The steam inlet pipe is equipped with multiple steam inlet valves connected to multiple inlet ends. The condensate outlet pipe is equipped with multiple condensate outlet valves connected to the outlet end. The steam inlet pipe assembly is used to input steam into the steam inlet pipe. The circulation pipeline assembly includes a gas circulation pipeline, a liquid circulation pipeline, and a vapor-liquid separator. The vapor-liquid separator has a condensate inlet, a gas outlet, and a liquid outlet. The drain end of the condensate outlet pipeline is connected to the condensate inlet. One end of the gas circulation pipeline is connected to the gas outlet, and the other end is connected to the downstream gas supply device. One end of the liquid circulation pipeline is connected to the liquid outlet, and the other end is connected to the downstream liquid supply device.

2. The heat exchange device for the ethanol Clostridium protein drying process according to claim 1, characterized in that, The multiple heat exchange tubes are configured as a first heat exchange tube group and a second heat exchange tube group. The steam input pipe and the condensate output pipe are connected to the first heat exchange tube group. The second heat exchange tube group is located on one side of the air inlet of the heat exchanger body. The second heat exchange tube group includes an air inlet heat exchange tube and a liquid inlet heat exchange tube. The gas circulation pipeline is connected to the air inlet heat exchange tube through an air inlet valve, and the liquid circulation pipeline is connected to the liquid inlet heat exchange pipeline through a liquid inlet valve.

3. The heat exchange device for the ethanol Clostridium protein drying process according to claim 2, characterized in that, A hot water tank and a hot water pump are installed on the liquid circulation pipeline. The hot water pump is located on the hot water outlet side of the hot water tank and is used to provide the force for the liquid flowing out of the hot water tank to enter the liquid inlet heat exchange tube.

4. The heat exchange device for the ethanol Clostridium protein drying process according to claim 3, characterized in that, It also includes a first condensate trap assembly, which is disposed on the liquid circulation pipeline and between the vapor-liquid separator and the hot water tank.

5. The heat exchange device for the ethanol Clostridium protein drying process according to claim 4, characterized in that, The first steam trap assembly includes a first steam trap and two first shut-off valves, with the first steam trap disposed between the two first shut-off valves.

6. The heat exchange device for the ethanol Clostridium protein drying process according to claim 3, characterized in that, A liquid circulation bypass is provided on the liquid circulation pipeline. The liquid circulation bypass has a liquid inlet and a liquid outlet. The liquid inlet and the liquid outlet are connected to the liquid circulation bypass. The first condensate trap group is provided between the liquid inlet and the liquid outlet. A third shut-off valve is provided on the liquid circulation bypass.

7. The heat exchange device for the ethanol Clostridium protein drying process according to claim 1, characterized in that, The steam input pipe assembly includes a steam input main pipe and a steam input valve assembly. The steam input main pipe is connected to the steam input pipe, and the steam input valve assembly is disposed on the steam input main pipe. The steam input valve assembly is used to control the amount of steam input from the steam input main pipe to the steam input pipe.

8. The heat exchange device for the ethanol Clostridium protein drying process according to claim 6, characterized in that, The steam input valve assembly includes a flow meter and two second shut-off valves, with the flow meter positioned between the two second shut-off valves.

9. The heat exchange device for the ethanol Clostridium protein drying process according to claim 1, characterized in that, It also includes a steam input bypass, which includes a bypass inlet and a bypass outlet. The bypass inlet and the bypass outlet are connected to the steam input main pipe. The steam input valve group is located between the bypass inlet and the bypass outlet, and a fourth shut-off valve is provided on the steam input bypass.

10. The heat exchange device for the ethanol Clostridium protein drying process according to claim 1, characterized in that, The liquid circulation pipeline is also equipped with a CIP tank connection pipeline.

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