Air pre-treatment device for fermentation and method for producing air for fermentation

Abstract

The application discloses a kind of pre-treatment device of fermentation air and the preparation method of fermentation air, when preparing fermentation air, high-temperature air output by air compressor is transported to first heat exchanger and exchanges heat with circulating water, cooling water and is cooled down;Low-temperature air after cooling is carried out vapor-liquid separation by vapor-liquid separator;Low-temperature air and high-temperature air after gas-liquid separation are respectively transported to second heat exchanger and are exchanged heat, low-temperature air is heated to make fermentation air, high-temperature air is cooled down and transported to first air outlet pipeline, and is made into fermentation air after being cooled and dehumidified by first heat exchanger and second heat exchanger;The application not only utilizes high-temperature air output by air compressor to exchange heat with low-temperature air and heat up, realizes the purpose of heat energy recycling;And when high-temperature air is cooled and dehumidified after heat exchange, it can reduce the use amount of circulating water and refrigeration water, realizes the purpose of energy saving and emission reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fermentation process, in particular to a kind of fermentation air pretreatment device and the preparation method of fermentation air. BACKGROUND

[0002] Now bio-tech company fermentation process air needs to ensure that the temperature and humidity (water content is low) of air are suitable, air is used through air compressor, heat exchanger, gas-liquid separator and other equipment to reach fermentation process available air;Among them, the temperature of air compressed output by air compressor is very high, and the water content is large, which needs to be cooled and dehumidified before being used for fermentation process;At present, the conventional method is to use a large amount of circulating water and chilled water on the heat exchanger to cool the air output by the air compressor, and then dehumidify the air when the temperature of the air is reduced to below 25℃ by using special cooling and dehumidifying equipment;Then, the low-temperature air after dehumidification is heated to the required temperature (40-45℃) by steam heat exchange to prepare fermentation process air;Among them, when the air output by the air compressor is cooled, the heat energy of the air is directly consumed, resulting in waste of heat energy;And a large amount of chilled water is made by lithium bromide chiller, which needs a large amount of heat energy, and a large amount of fuel is consumed when the low-temperature air is heated by steam;Moreover, in the preparation of biochemical fermentation air process, too many devices are used, and the connection of air pipes and liquid pipes is complicated;These supporting facilities need to invest a lot of operation cost to meet the process requirements, which not only has large volume, but also has high cost.

[0003] Therefore, the present application is developed and designed by the inventor after deep thinking and active research on the above-mentioned fermentation air pretreatment device and preparation method. SUMMARY

[0004] The present application aims to provide a fermentation air pretreatment device and a preparation method of fermentation air, which not only uses high-temperature air output by an air compressor to heat and raise the temperature of low-temperature air, realizes the purpose of heat energy recycling, and thus does not need to additionally set up steam generating equipment, simplifies the preparation method and reduces the cost;Moreover, when the high-temperature air is cooled and dehumidified after heat exchange and temperature reduction, the use amount of circulating water and chilled water can be reduced, and the purpose of energy saving and emission reduction can be realized.

[0005] In order to achieve the above-mentioned purpose, the solution of the present application is as follows:

[0006] A fermentation air pretreatment device, the pretreatment device comprises at least one set of combined heat exchanger for cooling and dehumidifying high-temperature air output by an air compressor, the combined heat exchanger comprises a first heat exchanger, a second heat exchanger and a gas-liquid separator;

[0007] The first heat exchanger is provided with a first air inlet, a first air outlet, a first circulating water inlet, a first circulating water outlet, a first chilled water inlet and a first chilled water outlet, and the vapor-liquid separator is arranged in the first heat exchanger and located at the side of the first air outlet; the second heat exchanger is provided with a second air inlet, a second air outlet, a hot air inlet and a hot air outlet.

[0008] The air compressor has a first air outlet pipeline connected with the first air inlet and a second air outlet pipeline connected with the hot air inlet, the first air inlet is connected with the second air inlet, the second air outlet is connected with the fermentation process, and the hot air outlet is connected with the first air outlet pipeline.

[0009] Part of the high-temperature air output by the air compressor is transported to the first heat exchanger through the first air outlet pipeline and exchanges heat with the circulating water and the chilled water on the first heat exchanger to be cooled; the low-temperature air after cooling is subjected to vapor-liquid separation through the vapor-liquid separator; the low-temperature air after vapor-liquid separation and the high-temperature air transported through the second air outlet pipeline are respectively transported to the second heat exchanger and subjected to heat exchange, the low-temperature air is heated to be fermented air, and the high-temperature air is cooled and then transported to the first air outlet pipeline, and the high-temperature air is cooled and dehumidified through the first heat exchanger and the second heat exchanger to be fermented air.

[0010] The combined heat exchanger further comprises a third heat exchanger and a refrigeration unit; the third heat exchanger is provided with a third air inlet, a third air outlet, a first hot water inlet and a first hot water outlet; the refrigeration unit is provided with a second hot water inlet, a second hot water outlet, a second chilled water inlet and a second chilled water outlet; the first air outlet pipeline has a first branch pipeline connected with the first air inlet and a second branch pipeline connected with the third air inlet, the third air outlet is connected with the first branch pipeline; the second hot water outlet is connected with the first hot water inlet, the first hot water outlet is connected with the second hot water inlet; the second chilled water outlet is connected with the first chilled water inlet, and the first chilled water outlet is connected with the second chilled water inlet; the high-temperature air and the hot water exchange heat in the third heat exchanger, the high-temperature air is cooled and transported to the first heat exchanger to be dehumidified, and the hot water is heated and transported to the refrigeration unit to be used as heat energy to make chilled water for the first heat exchanger.

[0011] The first air outlet pipeline is provided with a first switch valve, the first branch pipeline is provided with a first branch switch valve, the second branch pipeline is provided with a second branch switch valve, and the second air outlet pipeline is provided with a second switch valve.

[0012] The connection between the hot air outlet and the first air outlet pipeline is located on the first air outlet pipeline before the first branch switch valve and the second branch switch valve.

[0013] The third switch valve is arranged between the third gas outlet interface and the first gas inlet interface.

[0014] The pre-treatment device comprises a plurality of groups of combined heat exchangers connected in parallel.

[0015] The refrigerating unit is a lithium bromide refrigerating unit.

[0016] The first heat exchanger is a fin heat exchanger, comprising a first shell and a first tube bundle arranged in the first shell, and the first tube bundle is provided with a first front tube box and a first rear tube box at two ends thereof; the first circulating water inlet interface, the first circulating water outlet interface, the first chilled water inlet interface and the first chilled water outlet interface are respectively arranged on the end face of the first front tube box, the first tube bundle has a first branch pipe in communication with the first circulating water inlet interface, a second branch pipe in communication with the first circulating water outlet interface, a third branch pipe in communication with the first chilled water inlet interface and a fourth branch pipe in communication with the first chilled water outlet interface; the first gas inlet interface is arranged on the top of the first shell and close to the first front tube box; and the first gas outlet interface is arranged on the end of the first shell and close to the first rear tube box.

[0017] The first tube bundle further has a first fin, a first tube plate, a first support plate, a first upper side plate and a first lower side plate; the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe are stainless steel light pipes, and the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe are fixedly connected with the first fin by expansion connection respectively; the two ends of the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe are fixedly connected with the first tube plate by expansion connection respectively; the first upper side plate and the first lower side plate are bolted with the first tube plate respectively, and the first support plate is bolted with the first upper side plate and the first lower side plate respectively.

[0018] The vapor-liquid separator is locked on the gas outlet side of the first tube bundle by bolt connection, and has a plurality of heterogeneous separation sheets, and a wire mesh is arranged on the side close to the first tube bundle; the bottom of the first shell is provided with a first blowdown opening for discharging water separated and precipitated by the vapor-liquid separator.

[0019] The first tube bundle is provided with a first partial partition plate, the first branch pipe and the second branch pipe are located on one side of the first partial partition plate, and the third branch pipe and the fourth branch pipe are located on the other side of the first partial partition plate; the first circulating water inlet interface is located at the lower part of the end face of the first front tube box, and the first circulating water outlet interface is located at the upper part of the end face of the first front tube box; the first chilled water inlet interface is located at the lower part of the end face of the first front tube box, and the first chilled water outlet interface is located at the upper part of the end face of the first front tube box.

[0020] Temperature measuring sensors are arranged at the first gas inlet interface and the first gas outlet interface respectively.

[0021] The second heat exchanger is a light pipe heat exchanger, comprising a second shell and a second tube bundle; two ends of the second tube bundle are provided with a second front tube box and a second rear tube box, the second gas inlet interface is arranged on the end face of the second front tube box, and the second gas outlet interface is arranged on the end face of the second rear tube box; the hot air inlet interface and the hot air outlet interface are arranged on the second shell, and the hot air inlet interface is close to the second rear tube box, and the hot air outlet interface is close to the second front tube box.

[0022] The second tube bundle has a stainless steel light pipe, a second tube plate and a baffle plate, two ends of the stainless steel light pipe are respectively connected and fixed with the second tube plate through expansion joint connection, and the stainless steel light pipe and the baffle plate are connected and fixed through expansion joint connection; and the first shell is provided with an expansion joint.

[0023] The second gas outlet interface is provided with a temperature measuring sensor.

[0024] The bottom of the second shell is provided with a second blowdown port.

[0025] The third heat exchanger is a fin heat exchanger, comprising a third shell and a third tube bundle arranged in the third shell, and two ends of the third tube bundle are provided with a third front tube box and a third rear tube box; the first hot water inlet interface and the first hot water outlet interface are arranged on the end face of the first front tube box, the third tube bundle has a first branch pipe communicated with the first hot water inlet interface and a second branch pipe communicated with the first hot water outlet interface; the third gas inlet interface is arranged on the top of the third shell and close to the third front tube box; and the third gas outlet interface is arranged on the top of the third shell and close to the third rear tube box.

[0026] The first hot water outlet interface is located on the upper part of the end face of the third front tube box, and the first hot water inlet interface is located on the lower part of the end face of the third front tube box.

[0027] The third tube bundle further has a third fin, a third tube plate, a third support plate, a third upper side plate and a third lower side plate, the first branch pipe and the second branch pipe are stainless steel light pipes, two ends of the first branch pipe and the second branch pipe are respectively connected and fixed with the third tube plate through expansion joint connection; the third upper side plate and the third lower side plate are respectively connected and fixed with the third tube plate through bolts, and the third support plate is respectively connected and fixed with the third upper side plate and the third lower side plate through bolts.

[0028] The third tube bundle is provided with a third partial stroke baffle plate, two ends of the third partial stroke baffle plate are connected and fixed with the third tube plate through bolts; the first branch pipe is located on one side of the third partial stroke baffle plate, and the second branch pipe is located on the other side of the third partial stroke baffle plate.

[0029] The bottom of the third shell is provided with a third blowdown port.

[0030] A method for preparing fermentation air, using a pre-treatment device for preparing fermentation air, comprising the following steps:

[0031] S1, part of the high-temperature air output by the air compressor is sent to the first heat exchanger and exchanges heat with the circulating water and cooling water on the first heat exchanger to be cooled; the low-temperature air after cooling is subjected to vapor-liquid separation by a vapor-liquid separator;

[0032] S2, the low-temperature air after vapor-liquid separation is sent to the second heat exchanger, part of the high-temperature air output by the air compressor is also sent to the second heat exchanger, the low-temperature air and the high-temperature air exchange heat, and the low-temperature air is heated to be fermentation air;

[0033] S3, the high-temperature air after heat exchange and cooling in the second heat exchanger is sent to the first air outlet pipeline, and is first cooled and dehumidified by the first heat exchanger, and then heated to be fermentation air by the second heat exchanger.

[0034] Before step S1, there is also step S4, part of the high-temperature air output by the air compressor is sent to the third heat exchanger and exchanges heat with the hot water on the third heat exchanger to be cooled, the cooled air is sent to the first heat exchanger, and is first cooled and dehumidified by the first heat exchanger, and then heated to be fermentation air by the second heat exchanger; the hot water from the third heat exchanger is sent to the refrigeration unit as a heat source to make chilled water, and the chilled water is sent to the first heat exchanger.

[0035] The high-temperature air output by the air compressor is sent through the first air outlet pipeline and the second air outlet pipeline;

[0036] The high-temperature air sent from the first air outlet pipeline enters the third shell from the third air inlet interface of the third heat exchanger, the hot water enters the third tube bundle, the high-temperature air in the third shell contacts and exchanges heat with the surface of the third tube bundle and the third fin gap, and the high-temperature air is cooled in the third heat exchanger and is output from the third air outlet interface;

[0037] The hot water first enters the first branch pipe from the first hot water inlet interface of the third front pipe box, flows to the third rear pipe box, and then enters the second branch pipe, and the hot water and the high-temperature air exchange heat and are heated, and are then output from the first hot water outlet interface of the third front pipe box; then, the hot water is input into the refrigeration unit from the second hot water inlet interface as a heat source to make chilled water, finally, the cooled hot water is output from the second hot water outlet interface and returns to the first hot water inlet interface, forming a hot water circulating waterway;

[0038] The high-temperature air output by the third heat exchanger enters the first shell from the first air inlet interface, is first cooled and cooled by the circulating water in the first tube bundle, is then cooled and cooled by the chilled water in the first tube bundle, and is finally subjected to vapor-liquid separation by a vapor-liquid separator to form low-temperature air and is output from the first air outlet interface;

[0039] The circulating water enters the first sub-pipe through the first circulating water inlet interface of the first front pipe box, flows to the first rear pipe box, enters the second sub-pipe, and is output from the first circulating water outlet interface of the first front pipe box after heat exchange with high-temperature air, and returns to the circulating water pipeline, forming a circulating water circulation pipeline.

[0040] The chilled water is output from the second chilled water outlet interface of the refrigeration unit, enters the third sub-pipe through the first chilled water inlet interface of the first front pipe box, flows to the first rear pipe box, enters the fourth sub-pipe, and is output from the first chilled water outlet interface of the first front pipe box after heat exchange with high-temperature air, and returns to the refrigeration unit through the second chilled water inlet interface, forming a chilled water circulation pipeline.

[0041] The low-temperature air after gas-liquid separation enters the second pipe bundle through the second air inlet interface of the second front pipe box, and the low-temperature air is heated after heat exchange with high-temperature air, and the heated low-temperature air is output from the second air outlet interface of the second rear pipe box and enters the fermentation process.

[0042] The high-temperature air transported from the second air outlet pipeline enters the second shell through the hot air inlet interface, and the high-temperature air is cooled after heat exchange with low-temperature air, and the cooled high-temperature air is output from the hot air outlet interface and transported to the first air outlet pipeline, and is first cooled and dehumidified by the first heat exchanger, and then heated by the second heat exchanger to produce fermentation air.

[0043] The temperature of the high-temperature air output by the air compressor is 160℃, the high-temperature air is cooled to 140℃ by the third heat exchanger, then cooled to 30-40℃ by the circulating water of the first heat exchanger, then cooled to less than 25℃ by the chilled water of the first heat exchanger, and then dehumidified by the gas-liquid separator, and finally heated to 40-45℃ by the second heat exchanger to produce fermentation air.

[0044] The temperature of the hot water before being transported to the third heat exchanger is 70℃, and the temperature of the hot water after being output from the third heat exchanger is 90℃.

[0045] After adopting the above structure, the fermentation air pretreatment device and the fermentation air preparation method have the following beneficial effects:

[0046] 1. The pre-treatment device for fermentation air of the present application divides the high-temperature air output by the air compressor into two parts, one part of the high-temperature air is delivered to the first heat exchanger through the first air outlet pipeline and exchanges heat with the circulating water and cooling water on the first heat exchanger to be cooled; the low-temperature air after cooling is subjected to vapor-liquid separation through the vapor-liquid separator; the low-temperature air after vapor-liquid separation and the high-temperature air delivered through the second air outlet pipeline are respectively delivered to the second heat exchanger and subjected to heat exchange, the low-temperature air is heated to be fermentation air; the high-temperature air output by the air compressor is used to heat the low-temperature air, the heat energy of the high-temperature air is directly recycled and utilized, the heat exchange efficiency is high, the purpose of heat energy recycling is achieved, and no additional steam production equipment is needed, no large amount of fuel is consumed, and the preparation method is simplified and the cost is reduced.

[0047] 2. One part of the high-temperature air is delivered to the second heat exchanger through the second air outlet pipeline and exchanges heat with the low-temperature air to be cooled, the high-temperature air after cooling is delivered to the first air outlet pipeline, at this time, the temperature of the high-temperature air is lower than that of the high-temperature air output from the air compressor, when the low-temperature air is cooled and dehumidified in the first heat exchanger and the second heat exchanger, the use amount of the circulating water and the chilled water can be reduced, the use amount of the chilled water is reduced, the heat energy consumption can be reduced, the purpose of energy saving and emission reduction is achieved.

[0048] 3. The vapor-liquid separator of the present application is arranged in the first heat exchanger, the overall structure is more tidy, and the complicated connection of each gas pipeline and the inconvenient operation when the vapor-liquid separator is arranged alone can be avoided.

[0049] 4. The air pre-treatment device of the present application is a combined heat exchanger, the combined heat exchanger is provided with the first heat exchanger and the second heat exchanger, the structure is compact, the heat transfer efficiency is high, the heat exchange performance is strengthened, the volume is small, the sealing effect is good, and the service life is long; the larger production process requirements can be met, the heat can be recycled and utilized, and the energy saving and consumption reduction are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is a structure schematic view of the pre-treatment device for fermentation air of the present application;

[0051] Figure 2 It is a process flow schematic view when the pre-treatment device for fermentation air of the present application is used;

[0052] Figure 3 It is a front view schematic view of the first heat exchanger of the present application;

[0053] Figure 4 It is a side view schematic view of the first heat exchanger of the present application;

[0054] Figure 5 It is a top view schematic view of the first heat exchanger of the present application;

[0055] Figure 6 Fig. 1 is a schematic view of a first heat exchanger according to the present application in a front view;

[0056] Figure 7 Fig. 2 is a schematic view of the first heat exchanger according to the present application in a side view;

[0057] Figure 8 Fig. 3 is a schematic view of a first housing of the first heat exchanger according to the present application in a partial cross-sectional view;

[0058] Figure 9 Fig. 4 is a schematic view of a first tube bundle of the first heat exchanger according to the present application in a longitudinal cross-sectional view;

[0059] Figure 10 Fig. 5 is a schematic view of the first tube bundle of the first heat exchanger according to the present application in a transversal cross-sectional view;

[0060] Figure 11 Fig. 6 is a schematic view of the first tube bundle of the first heat exchanger according to the present application in a cross-sectional view along a longitudinal center axis;

[0061] Figure 12 Fig. 7 is a schematic view of a vapor-liquid separator position of the first heat exchanger according to the present application in a cross-sectional view;

[0062] Figure 13 Fig. 8 is a schematic view of a structure of a heterogeneous separation sheet of the vapor-liquid separator of the first heat exchanger according to the present application;

[0063] Figure 14 Fig. 9 is a schematic view of a second heat exchanger according to the present application in a front view;

[0064] Figure 15 Fig. 10 is a schematic view of the second heat exchanger according to the present application in a side view;

[0065] Figure 16 Fig. 11 is a schematic view of the second heat exchanger according to the present application in a cross-sectional view;

[0066] Figure 17 Fig. 12 is a schematic view of a third heat exchanger according to the present application in a front view;

[0067] Figure 18 Fig. 13 is a schematic view of the third heat exchanger according to the present application in a side view;

[0068] Figure 19 Fig. 14 is a schematic view of the third heat exchanger according to the present application in a top view;

[0069] Figure 20 Fig. 15 is a schematic view of the third heat exchanger according to the present application in a partial cross-sectional view;

[0070] Figure 21 Fig. 16 is a schematic view of a third housing of the third heat exchanger according to the present application in a partial cross-sectional view;

[0071] Figure 22 Fig. 17 is a schematic view of a third tube bundle of the third heat exchanger according to the present application in a longitudinal cross-sectional view;

[0072] Figure 23 Fig. 3 is a schematic view of a transverse section of a third tube bundle of a third heat exchanger of the present application;

[0073] Figure 24 Fig. 4 is a schematic view of a section of the third tube bundle at a third tube plate of the present application;

[0074] Figure 25 Fig. 5 is a schematic view of a section of the third tube bundle along a longitudinal center axis of the present application;

[0075] Figure 26 Fig. 6 is a schematic view of a structure of a multi-group air pre-treatment device of the present application;

[0076] Figure 27 Fig. 7 is a schematic view of a pre-treatment process flow of the multi-group air pre-treatment device of the present application when used in combination.

[0077] Symbol explanation

[0078] First heat exchanger 1; second heat exchanger 2; vapor-liquid separator 3; first air inlet 11; first air outlet 12; first circulating water inlet 13; first circulating water outlet 14; first chilled water inlet 15; first chilled water outlet; second air inlet 21; second air outlet 22; hot air inlet 23; hot air outlet 24; first air outlet pipeline 10; second air outlet pipeline 20; third heat exchanger 4; refrigeration unit 5; third air inlet 41; third air outlet 42; first hot water inlet 43; first hot water outlet 44; second hot water inlet 51; second hot water outlet 52; second chilled water inlet 53; second chilled water outlet 54; first branch pipeline 101; second branch pipeline 102; first switch valve 103; first branch switch valve 104; second branch switch valve 105; second switch valve 201; third switch valve 106; first shell 17; first tube bundle 18; first front tube box 181; first rear tube box 182; first fin 183; first tube plate 184; first support plate 185; first upper side plate 186; first lower side plate 187; male separation sheet 31; wire mesh 32; first blowdown 171; first stage partition plate 188; second shell 25; second tube bundle 26; second front tube box 261; second rear tube box 262; stainless steel light pipe 263; second tube plate 264; baffle 265; expansion joint 251; second blowdown 252; third shell 45; third tube bundle 46; third front tube box 461; third rear tube box 462; third fin 463; third tube plate 464; third support plate 465; third upper side plate 466; third lower side plate 467; third stage partition plate 468; third blowdown 451. DETAILED DESCRIPTION

[0079] In order to further explain the technical scheme of the present application, the present application will be described in detail below through specific examples.

[0080] Please refer to Figures 1 to 27 The present application discloses a kind of pre-treatment device of air for fermentation, the pre-treatment device includes at least one set of high-temperature air that air compressor comes out is cooled and dehumidified combined heat exchanger, the combined heat exchanger includes first heat exchanger 1, second heat exchanger 2 and vapor-liquid separator 3;

[0081] The first heat exchanger 1 is provided with first air inlet 11, first air outlet 12, first circulating water inlet 13, first circulating water outlet 14, first chilled water inlet 15 and first chilled water outlet 16, and the vapor-liquid separator 3 is arranged in the first heat exchanger 1 and located on the side of the first air outlet 12;Second heat exchanger 2 is provided with second air inlet 21, second air outlet 22, hot air inlet 23 and hot air outlet 24;

[0082] The air compressor has first air outlet pipeline 10 connected with the first air inlet 11 and second air outlet pipeline 20 connected with the hot air inlet 23, the first air outlet 12 is connected with the second air inlet 21, the second air outlet 22 is connected with the fermentation process, and the hot air outlet 24 is connected with the first air outlet pipeline 10;

[0083] In the preparation of air for fermentation, part of the high-temperature air output by the air compressor is transported to the first heat exchanger 1 through the first air outlet pipeline 10 and exchanges heat with the circulating water and cooling water on the first heat exchanger 1 to cool down;The low-temperature air after cooling is subjected to vapor-liquid separation by the vapor-liquid separator 3;The low-temperature air after vapor-liquid separation and the high-temperature air transported through the second air outlet pipeline 20 are respectively transported to the second heat exchanger 2 and subjected to heat exchange, the low-temperature air is warmed up to make the fermentation air, and the high-temperature air is cooled down and transported to the first air outlet pipeline 10, and then subjected to cooling and dehumidification by the first heat exchanger 1 and the second heat exchanger 2 to make the fermentation air;Not only the high-temperature air output by the air compressor is used to exchange heat with the low-temperature air to warm up, but also the purpose of heat energy recycling is achieved;Thus, without the need to additionally set up steam production equipment, the preparation method is simplified and the cost is reduced;Moreover, when the high-temperature air after heat exchange and cooling is subjected to cooling and dehumidification by the first heat exchanger 1, the use amount of circulating water and chilled water can be reduced, and the purpose of energy saving and emission reduction is achieved.

[0084] The combined heat exchanger further comprises a third heat exchanger 4 and a refrigerating unit 5; the third heat exchanger 4 is provided with a third air inlet 41, a third air outlet 42, a first hot water inlet 43 and a first hot water outlet 44; the refrigerating unit 5 is provided with a second hot water inlet 51, a second hot water outlet 52, a second chilled water inlet 53 and a second chilled water outlet 54; the first air outlet pipeline 10 has a first branch pipeline 101 connected with the first air inlet 11 and a second branch pipeline 102 connected with the third air inlet 41; the third air outlet 42 is connected with the first branch pipeline 101; the second hot water outlet 52 is connected with the first hot water inlet 43, and the first hot water outlet 44 is connected with the second hot water inlet 51; the second chilled water outlet 54 is connected with the first chilled water inlet 15, and the first chilled water outlet 16 is connected with the second chilled water inlet 53; the high-temperature air and the hot water exchange heat in the third heat exchanger 4, the high-temperature air is cooled and delivered to the first heat exchanger 1 for cooling and dehumidification, and the hot water is heated and delivered to the refrigerating unit 5 and used as heat energy to make chilled water for the first heat exchanger 1.

[0085] The third heat exchanger 4 and the refrigerating unit 5 are arranged before the first heat exchanger 1, high-temperature air output by the air compressor is heat-exchanged with hot water in the third heat exchanger 4, and the high-temperature air is transported to the first heat exchanger 1 after being cooled, since the temperature of the high-temperature air entering the first heat exchanger 1 is lower than that of the high-temperature air output by the air compressor, the use amount of circulating water and chilled water in the first heat exchanger 1 can be reduced to cool the high-temperature air to below 25 DEG C, the low-temperature air below 25 DEG C is conveniently separated into gas and liquid, the heat energy required for the refrigerating unit 5 to produce the chilled water can be saved, and the energy consumption is reduced, that is, the temperature of the high-temperature air output by the air compressor is 160 DEG C, the high-temperature air is cooled to 140 DEG C through the third heat exchanger 4, is cooled to 30-40 DEG C through the circulating water of the first heat exchanger 1, is cooled to below 25 DEG C through the chilled water of the first heat exchanger 1, and is dehumidified through the gas-liquid separator 3, and finally is heated to 40-45 DEG C through the second heat exchanger 2 to be fermented air, and the hot water output from the third heat exchanger 4 is transported to the refrigerating unit 5 and used as heat energy to produce the chilled water for the first heat exchanger 1, the heat energy of the high-temperature air can be directly recycled, the heat energy is recycled in one day, energy saving and emission reduction are achieved, and the hot water before being transported to the third heat exchanger 4 has a temperature of 70 DEG C, the hot water output from the third heat exchanger 4 has a temperature of 90 DEG C, the hot water output from the third heat exchanger 4 can be used as heat source of the refrigerating unit to produce the chilled water, and can also be used to produce refrigerating hot water, boiler water or heating water, that is, in summer, the heat generated in the process of cooling the high-temperature air is transferred to the hot water through the heat exchanger, the hot water is used as heat energy of the lithium bromide refrigerating unit to produce the chilled water, and the energy saving effect is achieved, and in winter, the heat generated in the process of cooling the high-temperature air is transferred to the heating water through the heat exchanger, and the heating water is used for heating, and the energy saving effect is achieved.

[0086] The first gas outlet pipeline 10 is provided with a first switch valve 103, the first branch pipeline 101 is provided with a first branch switch valve 104, and the second branch pipeline 102 is provided with a second branch switch valve 105, the second gas outlet pipeline 20 is provided with a second switch valve 201, and the switch valve is arranged on each air supply pipeline to facilitate the control of each air supply pipeline.

[0087] The connection between the hot air outlet interface 24 and the first gas outlet pipeline 10 is located on the first gas outlet pipeline 10 before the first branch switch valve 104 and the second branch switch valve 105, so that the cooled high-temperature air output from the hot air outlet interface 24 of the second heat exchanger 2 can be transported to the first heat exchanger 1 through the first gas outlet pipeline 10, and then the use amount of circulating water and chilled water can be reduced when the cooled high-temperature air is cooled and dehumidified in the first heat exchanger 1, and the purpose of energy saving and emission reduction is achieved.

[0088] The third switch valve 106 is arranged between the third air outlet interface 42 and the first air inlet interface 11 of the application; when the third heat exchanger 4 is shut down for maintenance, the second branch switch valve 105 and the third switch valve 106 can be closed, and the first branch switch valve 104 is opened, so that the high-temperature air of the air compressor is transported from the second branch pipeline 102 to the first heat exchanger 1 for cooling and dehumidification, and therefore, when the third heat exchanger 4 is maintained, the first heat exchanger 1 and the second heat exchanger 2 can continue to operate, so that the entire device can always maintain an operating state.

[0089] The pre-treatment device of the application comprises a plurality of groups of combined heat exchangers connected in parallel; the combined heat exchanger can meet the heat exchange needs of large-scale fermentation process production equipment through series connection, parallel connection, series-parallel connection between units, and has strong adaptability and is suitable for different heat exchange conditions.

[0090] The refrigerating unit 5 of the application is a lithium bromide refrigerating unit.

[0091] The first heat exchanger 1 of the application is a fin heat exchanger, comprising a first shell 17 and a first tube bundle 18 arranged in the first shell 17, and the first tube bundle 18 is provided with a first front pipe box 181 and a first rear pipe box 182 at both ends; the first circulating water inlet interface 13, the first circulating water outlet interface 14, the first chilled water inlet interface 15 and the first chilled water outlet interface 16 are arranged on the end face of the first front pipe box 181, respectively; the first tube bundle 18 has a first branch pipe in communication with the first circulating water inlet interface 13, a second branch pipe in communication with the first circulating water outlet interface 14, a third branch pipe in communication with the first chilled water inlet interface 15 and a fourth branch pipe in communication with the first chilled water outlet interface 16; the first air inlet interface 11 is arranged on the top of the first shell 17 and close to the first front pipe box 181; and the first air outlet interface 12 is arranged on the end of the first shell 17 and close to the first rear pipe box 182.

[0092] The first tube bundle 18 of the application further has a first fin 183, a first tube plate 184, a first support plate 185, a first upper side plate 186 and a first lower side plate 187; the first sub-tube, the second sub-tube, the third sub-tube and the fourth sub-tube are stainless steel light tubes, which are fixed by expansion joint connection (or expansion joint connection + welding connection cooperation fixation) with the first fin 183 respectively; the first tube plate 184 is tightly contacted with the stainless steel light tube and is not affected by thermal expansion and cold shrinkage, so that the sealing property of the tube head of the stainless steel light tube is ensured; the two ends of the first sub-tube, the second sub-tube, the third sub-tube and the fourth sub-tube are fixed by expansion joint connection (or expansion joint connection + welding connection cooperation fixation) with the first tube plate 184 respectively; the first upper side plate 186 and the first lower side plate 187 are fixed by bolt connection with the first tube plate 184 respectively, and the first support plate 185 is fixed by bolt connection with the first upper side plate 186 and the first lower side plate 187 respectively; the first support plate 185 is an internal component which can control the flow direction of air into the first shell 17 and firmly supports the first tube bundle 18 in the first shell 17.

[0093] The gas-liquid separator 3 of the application is locked on the air outlet side of the first tube bundle 18 by bolt connection, and has a plurality of heterogeneous separation sheets 31 and a wire screen 32 arranged on the side close to the first tube bundle 18; after the low-temperature air cooled down is passed through the gas-liquid separator 3, the air can be dehumidified to limit the humidity of the air; the bottom of the first shell 17 is provided with a first blowdown opening 171 for discharging the moisture separated and analyzed by the gas-liquid separator 3.

[0094] The high-temperature air of the application enters the first shell 17 through the first air inlet 11, is cooled down by the circulating water in the first tube bundle 18 first, is cooled down by the chilled water in the first tube bundle 18 later, and is subjected to gas-liquid separation by the gas-liquid separator 3 finally to form low-temperature air and output by the first air outlet 12; the circulating water enters the first sub-tube from the first circulating water inlet 13 of the first front tube header 181 first, flows to the first rear tube header 182, enters the second sub-tube, and is heated and raised in temperature by the high-temperature air and then output by the first circulating water outlet 14 of the first front tube header 181 to return to the circulating water pipeline to form a circulating water circulation path; the chilled water is output by the second chilled water outlet 54 of the refrigerating unit, enters the third sub-tube from the first chilled water inlet 15 of the first front tube header 181, flows to the first rear tube header 182, enters the fourth sub-tube, is heated and raised in temperature by the high-temperature air, is output by the first chilled water outlet 16 of the first front tube header 181, and returns to the refrigerating unit by the second chilled water inlet 53 to form a chilled water circulation path; the circulating water circulation path and the chilled water circulation path are convenient for heat exchange and cooling of the high-temperature air and have high heat exchange efficiency.

[0095] The first tube bundle 18 of the present invention is provided with a first partition plate 188, the first branch pipe and the second branch pipe are located on one side of the first partition plate 188, and the third branch pipe and the fourth branch pipe are located on the other side of the first partition plate 188; the first circulating water inlet 13 is located at the lower part of the end face of the first front tube box 181, and the first circulating water outlet 14 is located at the upper part of the end face of the first front tube box 181; the first chilled water inlet 15 is located at the lower part of the end face of the first front tube box 181, and the first chilled water outlet 16 is located at the upper part of the end face of the first front tube box 181; the circulating water and chilled water can flow and operate in independent spaces to realize their respective heat exchange functions, so as to improve the cooling effect of high temperature air.

[0096] Temperature sensors are respectively provided at the first air inlet 11 and the first air outlet 12 of the present invention; to facilitate monitoring of the air temperature at the first air inlet 11 and the first air outlet 12.

[0097] The second heat exchanger 2 of the present invention is a bare tube heat exchanger, including a second housing 25 and a second tube bundle 26; a second front tube box 261 and a second rear tube box 262 are provided at both ends of the second tube bundle 26; a second air inlet 21 is provided on the end face of the second front tube box 261; a second air outlet 22 is provided on the end face of the second rear tube box 262; a hot air inlet 23 and a hot air outlet 24 are provided on the second housing 25, and the hot air inlet 23 is close to the second rear tube box 262, and the hot air outlet 24 is close to the second front tube box 261.

[0098] In this invention, the low-temperature air after gas-liquid separation enters the second tube bundle 26 from the second air inlet 21 of the second front tube box 261. After heat exchange between the low-temperature air and the high-temperature air, the heated low-temperature air is output from the second air outlet 22 of the second rear tube box 262 and enters the fermentation process. Moreover, the high-temperature air transported from the second air outlet 20 enters the second shell 25 from the hot air inlet 23. After heat exchange between the high-temperature air and the low-temperature air, the cooled high-temperature air is output from the hot air outlet 24 and transported to the first air outlet 10. It is first cooled and dehumidified by the first heat exchanger 1, and then heated by the second heat exchanger 2 to produce fermentation air. When the high-temperature air output by the air compressor is cooled by the second heat exchanger 2 before being transported to the first heat exchanger 1 for heat exchange and cooling, the amount of circulating water and chilled water required is reduced, which can save the heat energy required by the refrigeration unit 5 to produce chilled water and reduce energy consumption.

[0099] The second tube bundle 26 of the application has a stainless steel light tube 263, a second tube plate 264 and a baffle plate 265, the two ends of the stainless steel light tube 263 are respectively fixedly connected with the second tube plate 264 by expansion joint connection (or expansion joint connection + welding connection cooperation fixation), the stainless steel light tube 263 and the baffle plate 265 are fixedly connected by expansion joint connection, which ensures that the second tube plate 264 is in close contact with the stainless steel light tube 263 and is not affected by thermal expansion and cold shrinkage, so that the sealing property of the stainless steel light tube head is ensured, and the first shell 25 is provided with an expansion joint 251, and the conveying expansion joint 251 can provide a space for releasing stress of the second shell under the condition of thermal expansion and cold shrinkage, so that the safe operation of the second shell is ensured.

[0100] The first gas outlet interface 12 of the first heat exchanger 1 is arranged at the end of the first shell 17, the second gas inlet interface 21 of the second heat exchanger 2 is arranged at the end of the second shell 25, and the first gas outlet interface 12 and the second gas inlet interface 21 are fixedly connected by expansion joints, flanges and fasteners, so that the structure is compact, the installation and maintenance are convenient, and the construction cost is low.

[0101] The second gas outlet interface 22 is provided with a temperature measuring sensor, so that the air temperature at the second gas outlet interface 22 can be monitored.

[0102] The bottom of the second shell 25 is provided with a second blowdown opening 252, so that the liquid generated in the heat exchange process can be discharged.

[0103] The third heat exchanger 4 of the application is a fin heat exchanger, which comprises a third shell 45 and a third tube bundle 46 arranged in the third shell 45, the two ends of the third tube bundle 46 are provided with a third front tube box 461 and a third rear tube box 462, the first hot water inlet interface 41 and the first hot water outlet interface 42 are arranged on the end face of the first front tube box 461, the third tube bundle 46 has a first branch pipe in communication with the first hot water inlet interface 43 and a second branch pipe in communication with the first hot water outlet interface 44, the third gas inlet interface 41 is arranged at the top of the third shell 45 and close to the third front tube box 461, and the third gas outlet interface 42 is arranged at the top of the third shell 45 and close to the third rear tube box 462.

[0104] The high-temperature air output by the air compressor is delivered through the first air outlet pipeline 10 and enters the third shell 45 from the third air inlet interface 41 of the third heat exchanger 4, the hot water first enters the first branch pipe from the first hot water inlet interface 43 of the third front pipe header 461 and flows to the third rear pipe header 462, and then enters the second branch pipe, the high-temperature air in the third shell 45 is contacted and exchanged heat through the surface of the third pipe bundle 46 and the third fin gap, the high-temperature air is cooled in the third heat exchanger 4 and is output from the third air outlet interface 42, and the heated hot water is output from the first hot water outlet interface 44 and delivered to the refrigerating unit 5 as a heat source to make chilled water, so that the heat energy of the high-temperature air is recycled and reused, and energy saving and emission reduction are achieved.

[0105] The first hot water outlet interface 44 of the application is located at the upper part of the end face of the third front pipe header 461, and the first hot water inlet interface 43 is located at the lower part of the end face of the third front pipe header 461; the flow direction of the high-temperature air is different from that of the hot water, forming counter-current heat exchange, and the heat exchange effect is better.

[0106] The third pipe bundle 46 of the application further has a third fin 463, a third pipe plate 464, a third support plate 465, a third upper side plate 466 and a third lower side plate 467, the first branch pipe and the second branch pipe are stainless steel light pipes, and the two ends of the first branch pipe and the second branch pipe are respectively connected and fixed with the third pipe plate 464 by expansion joint connection (or expansion joint connection + welding connection cooperation and fixation); the third pipe plate 464 is tightly contacted with the stainless steel light pipe and is not affected by thermal expansion and cold shrinkage, so that the sealing property of the pipe head of the stainless steel light pipe is ensured; the third upper side plate 466 and the third lower side plate 467 are respectively fixed with the third pipe plate 464 by bolt connection, and the third support plate 465 is respectively fixed with the third upper side plate 466 and the third lower side plate 467 by bolt connection; the third support plate 465 is an internal component capable of controlling the flow direction of the air in the third shell 45 and firmly supports the third pipe bundle 46 in the third shell 45.

[0107] The third pipe bundle 46 of the application is provided with a third partial-range partition plate 468, the two ends of the third partial-range partition plate 468 are fixed with the third pipe plate 464 by bolt connection; the first branch pipe is located on one side of the third partial-range partition plate 468, and the second branch pipe is located on the other side of the third partial-range partition plate 468; the third partial-range partition plate 468 can ensure the hot water to flow in a specified space and realize heat exchange.

[0108] The bottom of the third shell 45 of the application is provided with a third blowdown opening 451; the liquid generated in the heat exchange process can be discharged.

[0109] The application further discloses a preparation method of the fermentation air, and the fermentation air is prepared by using the pretreatment device of the fermentation air, and has the following steps:

[0110] S1, part of the high-temperature air output by the air compressor is transported to the first heat exchanger 1 and exchanges heat with the circulating water and cooling water on the first heat exchanger 1 to reduce the temperature; the low-temperature air after temperature reduction is subjected to vapor-liquid separation by the vapor-liquid separator 3;

[0111] S2, the low-temperature air after vapor-liquid separation is transported to the second heat exchanger 2, and part of the high-temperature air output by the air compressor is also transported to the second heat exchanger 2, the low-temperature air and the high-temperature air exchange heat, and the low-temperature air is heated to produce fermentation air;

[0112] S3, the high-temperature air after heat reduction in the second heat exchanger 2 is transported to the first air outlet pipeline 10, and is first subjected to temperature reduction and dehumidification by the first heat exchanger 1, and then is heated to produce fermentation air by the second heat exchanger 2.

[0113] The present application has the following beneficial effects relative to the prior art method for producing fermentation air:

[0114] 1, the pre-treatment device for fermentation air of the present application divides the high-temperature air output by the air compressor into two parts, one part of the high-temperature air is transported to the first heat exchanger 1 through the first air outlet pipeline 10 and exchanges heat with the circulating water and cooling water on the first heat exchanger 1 to reduce the temperature; the low-temperature air after temperature reduction is subjected to vapor-liquid separation by the vapor-liquid separator 3; the low-temperature air after vapor-liquid separation and the high-temperature air transported through the second air outlet pipeline 20 are respectively transported to the second heat exchanger 2 and exchange heat, the low-temperature air is heated to produce fermentation air; the high-temperature air output by the air compressor is used to heat and increase the temperature of the low-temperature air, the heat energy of the high-temperature air is directly recovered and used, the heat exchange efficiency is high, the purpose of heat energy recovery is achieved, and no additional steam production equipment is needed, no large amount of fuel is consumed, and the production method is simplified and the cost is reduced;

[0115] 2, one part of the high-temperature air is transported to the second heat exchanger 2 through the second air outlet pipeline 20, and after heat exchange and temperature reduction with the low-temperature air, the high-temperature air after temperature reduction is transported to the first air outlet pipeline 10, at this time, the temperature of the high-temperature air is lower than that of the high-temperature air output from the air compressor, and when the high-temperature air is subjected to temperature reduction and dehumidification in the first heat exchanger 1 and the second heat exchanger 2, the use amount of circulating water and refrigeration water can be reduced, the use amount of refrigeration water is reduced, the heat energy consumption can be reduced, the purpose of energy saving and emission reduction is achieved;

[0116] 3, the vapor-liquid separator 3 is arranged in the first heat exchanger 1, the overall structure is more tidy, and the vapor-liquid separator 3 can avoid complicated connection of various gas pipelines and inconvenient operation when arranged alone.

[0117] 4. The air pretreatment device for fermentation air of the present invention is a combined heat exchanger, which is provided with a first heat exchanger 1 and a second heat exchanger 2. It has a compact structure, high heat transfer efficiency, enhanced heat exchange performance, small size, good sealing effect and long service life; it can meet the requirements of large production processes, and can recover and utilize heat to achieve energy saving and consumption reduction.

[0118] The present invention further includes step S4 before step S1, wherein a portion of the high-temperature air output from the air compressor is delivered to the third heat exchanger 4 and exchanged heat with the hot water on the third heat exchanger 4 to cool down. The cooled air is then delivered to the first heat exchanger 1 and first cooled and dehumidified by the first heat exchanger 1, and then heated by the second heat exchanger 2 to produce fermentation air. Meanwhile, the hot water from the third heat exchanger 4 is delivered to the refrigeration unit 5 as a heat source to produce chilled water, and the chilled water is delivered to the first heat exchanger 1 for use.

[0119] This invention includes a third heat exchanger 4 and a refrigeration unit 5 preceding the first heat exchanger 1. High-temperature air output from the air compressor enters the third heat exchanger 4 and exchanges heat with hot water. After cooling, the high-temperature air is delivered to the first heat exchanger 1. Since the temperature of the high-temperature air entering the first heat exchanger 1 is lower than that of the high-temperature air output from the air compressor, the temperature of the high-temperature air can be reduced to below 25°C by decreasing the amount of circulating water and chilled water used in the first heat exchanger 1. This facilitates vapor-liquid separation of the low-temperature air below 25°C, saving the heat energy required for the refrigeration unit 5 to produce chilled water and reducing energy consumption. Furthermore, the hot water output from the third heat exchanger 4 is delivered to the refrigeration unit 5... The chiller unit 5 uses heat energy to produce chilled water for the first heat exchanger 1, directly recovering and utilizing the heat energy of the high-temperature air to achieve the goal of daily heat energy recovery, thus saving energy and reducing emissions. Moreover, the hot water output from the third heat exchanger 4 can be used as a heat source for the chiller unit to produce chilled water, and can also be used for cooling hot water, boilers, or heating water. That is, in summer, the heat generated during the cooling process of high-temperature air is transferred to hot water through the heat exchanger, and the hot water is used by the lithium bromide chiller unit as heat energy to produce chilled water, which can achieve energy-saving effects. In winter, the heat generated during the cooling process of high-temperature air is transferred to heating water through the heat exchanger, and the heating water is used for heating, which can achieve energy-saving effects.

[0120] The high-temperature air output by the air compressor of the present invention is distributed through the first outlet pipe 10 and the second outlet pipe 20.

[0121] High-temperature air delivered from the first outlet pipe 10 enters the third housing 45 through the third inlet port 41 of the third heat exchanger 4. Hot water enters the third tube bundle 46. The high-temperature air in the third housing 45 undergoes heat exchange through the surface of the third tube bundle 46 and the gap between the third fins 463. The high-temperature air is cooled in the third heat exchanger 4 and output from the third outlet port 42.

[0122] The hot water enters the first branch pipe from the first hot water inlet interface 43 of the third front pipe box 461, flows to the third rear pipe box 462, enters the second branch pipe, and is output from the first hot water outlet interface 44 of the third front pipe box 461 after being heated by the high-temperature air; then enters the refrigeration unit as a heat source to make chilled water from the second hot water inlet interface 51, and finally, the cooled hot water is output from the second hot water outlet interface 52 and returned to the first hot water inlet interface 43, forming a hot water circulation waterway;

[0123] The high-temperature air output by the third heat exchanger 4 enters the first shell 17 from the first air inlet interface 11, is cooled and cooled by the chilled water in the first pipe bundle 18, and finally is separated into low-temperature air by the vapor-liquid separator 3 and output from the first air outlet interface 12;

[0124] The circulating water enters the first branch pipe from the first circulating water inlet interface 13 of the first front pipe box 181, flows to the first rear pipe box 182, enters the second branch pipe, and is output from the first circulating water outlet interface 14 of the first front pipe box 181 after being heated by the high-temperature air, and is returned to the circulating water pipe, forming a circulating water circulation waterway;

[0125] The chilled water is output from the second chilled water outlet interface 54 of the refrigeration unit, enters the third branch pipe from the first chilled water inlet interface 15 of the first front pipe box 181, flows to the first rear pipe box 182, enters the fourth branch pipe, is heated by the high-temperature air, and is output from the first chilled water outlet interface 16 of the first front pipe box 181, and is returned to the refrigeration unit 5 from the second chilled water inlet interface 53, forming a chilled water circulation waterway;

[0126] The low-temperature air after vapor-liquid separation enters the second pipe bundle 26 from the second air inlet interface 21 of the second front pipe box 25, and the low-temperature air is heated after being exchanged with the high-temperature air, and the heated low-temperature air is output from the second air outlet interface 22 of the second rear pipe box 262 and enters the fermentation process;

[0127] The high-temperature air transported from the second air outlet pipe 20 enters the second shell 25 from the hot air inlet interface 23, and the high-temperature air is cooled after being exchanged with the low-temperature air, and the cooled high-temperature air is output from the hot air outlet interface 24 and transported to the first air outlet pipe 10, and is first cooled and dehumidified by the first heat exchanger 1, and then heated by the second heat exchanger 2 to make fermentation air.

[0128] The temperature of the high-temperature air output by the air compressor of the present application is 160 DEG C, the high-temperature air is cooled to 140 DEG C by the third heat exchanger 4, then cooled to 30-40 DEG C by the circulating water of the first heat exchanger 1, then cooled to below 25 DEG C by the chilled water of the first heat exchanger 1, then the humidity of the air is reduced by the vapor-liquid separator 3, and finally the temperature is raised to 40-45 DEG C by the second heat exchanger 2 to produce the fermentation air.

[0129] The temperature of the hot water before being delivered to the third heat exchanger 4 is 70 DEG C, and the temperature of the hot water after being output from the third heat exchanger 4 is 90 DEG C; the hot water output from the third heat exchanger 4 can be used as the heat source of the refrigerating unit 5 to produce the chilled water for the first heat exchanger 1, and the heat energy of the high-temperature air can be directly recycled to achieve the purpose of recycling the heat energy in one day and save energy and reduce emissions.

[0130] The above embodiments and drawings are not limited to the product shape and style of the present application, and any appropriate changes or modifications made by any ordinary skilled person in the art shall be considered as not departing from the scope of the present application.

Claims

1. A pretreatment device for fermentation air, characterized in that: The pretreatment device includes at least one set of combined heat exchangers for cooling and dehumidifying the high-temperature air from the air compressor. The combined heat exchangers include a first heat exchanger, a second heat exchanger, and a vapor-liquid separator. The first heat exchanger is provided with a first air inlet, a first air outlet, a first circulating water inlet, a first circulating water outlet, a first chilled water inlet, and a first chilled water outlet. The vapor-liquid separator is located inside the first heat exchanger and is situated on one side of the first air outlet. The second heat exchanger is provided with a second air inlet, a second air outlet, a hot air inlet, and a hot air outlet. The air compressor has a first air outlet pipe connected to a first air inlet and a second air outlet pipe connected to a hot air inlet. The first air outlet and the second air inlet are connected. The second air outlet is connected to the fermentation process. The hot air outlet is connected to the first air outlet pipe. A portion of the high-temperature air output from the air compressor is delivered to the first heat exchanger through the first outlet pipeline, where it exchanges heat with the circulating water and cooling water on the first heat exchanger to cool down. The cooled low-temperature air undergoes vapor-liquid separation through a vapor-liquid separator. The low-temperature air after vapor-liquid separation and the high-temperature air delivered through the second outlet pipeline are respectively delivered to the second heat exchanger for heat exchange. The low-temperature air is heated to produce fermentation air, while the high-temperature air is cooled down and delivered to the first outlet pipeline, where it is cooled and dehumidified through the first and second heat exchangers to produce fermentation air. The combined heat exchanger further includes a third heat exchanger and a refrigeration unit; the third heat exchanger is provided with a third air inlet, a third air outlet, a first hot water inlet, and a first hot water outlet; the refrigeration unit is provided with a second hot water inlet, a second hot water outlet, a second chilled water inlet, and a second chilled water outlet; the first air outlet pipe has a first branch pipe connected to the first air inlet and a second branch pipe connected to the third air inlet, and the third air outlet and the first branch pipe are connected; the second hot water outlet is connected to the first hot water inlet, and the first hot water outlet and the second hot water inlet are connected; the second chilled water outlet is connected to the first chilled water inlet, and the first chilled water outlet and the second chilled water inlet are connected; high-temperature air and hot water exchange heat in the third heat exchanger, the high-temperature air is cooled and sent to the first heat exchanger for cooling and dehumidification, and the hot water is heated and sent to the refrigeration unit and used as heat energy to produce chilled water for the first heat exchanger.

2. The pretreatment device for fermentation air as described in claim 1, characterized in that: The first outlet pipeline is equipped with a first switching valve, the first branch pipeline is equipped with a first branch switching valve, the second branch pipeline is equipped with a second branch switching valve, and the second outlet pipeline is equipped with a second switching valve.

3. The pretreatment device for fermentation air as described in claim 1, characterized in that: A third switching valve is provided between the third air outlet and the first air inlet.

4. The pretreatment device for fermentation air as described in claim 1, characterized in that: The pretreatment device includes multiple sets of combined heat exchangers connected in parallel.

5. The pretreatment device for fermentation air as described in claim 1, characterized in that: The first heat exchanger is a finned heat exchanger, including a first housing and a first tube bundle disposed within the first housing. A first front tube box and a first rear tube box are disposed at both ends of the first tube bundle. The first circulating water inlet, the first circulating water outlet, the first chilled water inlet, and the first chilled water outlet are respectively disposed on the end face of the first front tube box. The first tube bundle has a first branch pipe communicating with the first circulating water inlet, a second branch pipe communicating with the first circulating water outlet, a third branch pipe communicating with the first chilled water inlet, and a fourth branch pipe communicating with the first chilled water outlet. The first air inlet is disposed at the top of the first housing and close to the first front tube box. The first air outlet is disposed at the end of the first housing and close to the first rear tube box.

6. The pretreatment device for fermentation air as described in claim 5, characterized in that: The first tube bundle also includes a first fin, a first tube sheet, a first support plate, a first upper side plate, and a first lower side plate; the first branch tube, the second branch tube, the third branch tube, and the fourth branch tube are stainless steel tubes, and the first branch tube, the second branch tube, the third branch tube, and the fourth branch tube are respectively expanded and fixedly connected to the first fin; the two ends of the first branch tube, the second branch tube, the third branch tube, and the fourth branch tube are respectively expanded and fixedly connected to the first tube sheet; the first upper side plate and the first lower side plate are respectively bolted and fixedly connected to the first tube sheet, and the first support plate is respectively bolted and fixedly connected to the first upper side plate and the first lower side plate.

7. The pretreatment device for fermentation air as described in claim 5, characterized in that: The vapor-liquid separator is bolted to the outlet side of the first tube bundle, and the vapor-liquid separator has multiple heterogeneous separation plates, and a wire mesh is provided on the side near the first tube bundle; the bottom of the first housing is provided with a first drain port for discharging the water separated by the vapor-liquid separator.

8. The pretreatment device for fermentation air as described in claim 5, characterized in that: The first tube bundle is provided with a first partition plate, the first branch pipe and the second branch pipe are located on one side of the first partition plate, and the third branch pipe and the fourth branch pipe are located on the other side of the first partition plate; the first circulating water inlet is located at the lower part of the end face of the first front tube box, and the first circulating water outlet is located at the upper part of the end face of the first front tube box; the first chilled water inlet is located at the lower part of the end face of the first front tube box, and the first chilled water outlet is located at the upper part of the end face of the first front tube box.

9. The pretreatment device for fermentation air as described in claim 5, characterized in that: Temperature sensors are respectively installed at the first air inlet and the first air outlet.

10. The pretreatment apparatus for fermentation air as described in claim 1, characterized in that: The second heat exchanger is a bare tube heat exchanger, including a second shell and a second tube bundle; a second front tube box and a second rear tube box are provided at both ends of the second tube bundle, the second air inlet is provided on the end face of the second front tube box, the second air outlet is provided on the end face of the second rear tube box, the hot air inlet and the hot air outlet are provided on the second shell, and the hot air inlet is close to the second rear tube box, and the hot air outlet is close to the second front tube box.

11. The pretreatment apparatus for fermentation air as described in claim 10, characterized in that: The second tube bundle has a stainless steel tube, a second tube sheet, and a baffle plate. The two ends of the stainless steel tube are respectively connected and fixed to the second tube sheet by expansion joints, and the stainless steel tube and the baffle plate are connected and fixed by expansion joints. The second housing is provided with an expansion joint.

12. The pretreatment apparatus for fermentation air as described in claim 10, characterized in that: A temperature sensor is installed at the second air outlet.

13. The pretreatment apparatus for fermentation air as described in claim 1, characterized in that: The third heat exchanger is a finned heat exchanger, including a third shell and a third tube bundle disposed within the third shell. The third tube bundle has a third front tube box and a third rear tube box at both ends. The first hot water inlet and the first hot water outlet are disposed on the end face of the first front tube box. The third tube bundle has a first branch pipe communicating with the first hot water inlet and a second branch pipe communicating with the first hot water outlet. The third air inlet is located at the top of the third shell and close to the third front tube box. The third air outlet is located at the top of the third shell and close to the third rear tube box.

14. The pretreatment apparatus for fermentation air as described in claim 13, characterized in that: The first hot water outlet is located at the upper part of the end face of the third front pipe box, and the first hot water inlet is located at the lower part of the end face of the third front pipe box.

15. The pretreatment apparatus for fermentation air as described in claim 13, characterized in that: The third tube bundle also includes a third fin, a third tube sheet, a third support plate, a third upper side plate, and a third lower side plate. The first branch tube and the second branch tube are stainless steel tubes. The two ends of the first branch tube and the second branch tube are respectively connected and fixed to the third tube sheet by expansion joints. The third upper side plate and the third lower side plate are respectively bolted and fixed to the third tube sheet. The third support plate is respectively bolted and fixed to the third upper side plate and the third lower side plate.

16. The pretreatment apparatus for fermentation air as described in claim 13, characterized in that: The third tube bundle is provided with a third split partition, and the two ends of the third split partition are fixed to the third tube sheet by bolts; the first branch pipe is located on one side of the third split partition, and the second branch pipe is located on the other side of the third split partition.

17. A method for preparing air for fermentation, characterized in that, Fermentation air is prepared using the pretreatment apparatus for fermentation air as described in any one of claims 1-16, comprising the following steps: S1. A portion of the high-temperature air output from the air compressor is delivered to the first heat exchanger and exchanged heat with the circulating water and cooling water on the first heat exchanger to cool down; the cooled low-temperature air then passes through a vapor-liquid separator for vapor-liquid separation. S2. The low-temperature air after gas-liquid separation is delivered to the second heat exchanger. A portion of the high-temperature air output from the air compressor is also delivered to the second heat exchanger. The low-temperature air and the high-temperature air exchange heat, and the low-temperature air is heated to produce fermentation air. S3. The high-temperature air, after being cooled by heat exchange in the second heat exchanger, is delivered to the first outlet pipeline. It is first cooled and dehumidified by the first heat exchanger, and then heated by the second heat exchanger to produce fermentation air.

18. The method for preparing fermentation air as described in claim 17, characterized in that: Before step S1, there is a step S4, in which part of the high-temperature air output by the air compressor is sent to the third heat exchanger and exchanged heat with the hot water on the third heat exchanger to cool down. The cooled air is sent to the first heat exchanger and first cooled and dehumidified by the first heat exchanger, and then heated by the second heat exchanger to make fermentation air. The hot water from the third heat exchanger is sent to the refrigeration unit as a heat source to make chilled water, and the chilled water is sent to the first heat exchanger for use.

19. The method for preparing fermentation air as described in claim 18, characterized in that: The high-temperature air output from the air compressor is distributed through the first outlet pipe and the second outlet pipe; High-temperature air delivered from the first outlet pipe enters the third housing through the third inlet port of the third heat exchanger. Hot water enters the third tube bundle. The high-temperature air in the third housing undergoes heat exchange through the surface of the third tube bundle and the gap between the third fins. The high-temperature air is cooled in the third heat exchanger and output from the third outlet port. Hot water first enters the first branch pipe from the first hot water inlet of the third front pipe box, flows to the third rear pipe box, and then enters the second branch pipe. After the hot water exchanges heat with the high-temperature air and is heated, it is output from the first hot water outlet of the third front pipe box. Then, it enters the chiller unit as a heat source to produce chilled water from the second hot water inlet. Finally, the cooled hot water is output from the second hot water outlet and returns to the first hot water inlet, forming a hot water circulation circuit. The high-temperature air output from the third heat exchanger enters the first housing through the first air inlet. It is first cooled by the circulating water in the first tube bundle, then cooled by the chilled water in the first tube bundle, and finally separated by the vapor-liquid separator to form low-temperature air, which is then output through the first air outlet. The circulating water first enters the first branch pipe through the first circulating water inlet of the first front pipe box, flows to the first rear pipe box, and then enters the second branch pipe. After the circulating water exchanges heat with the high-temperature air and is heated, it is output from the first circulating water outlet of the first front pipe box and returns to the circulating water pipeline, forming a circulating water circulation path. Chilled water is output from the second chilled water outlet of the chiller unit and enters the third branch pipe through the first chilled water inlet of the first front pipe box. It then flows to the first rear pipe box and enters the fourth branch pipe. After the chilled water exchanges heat with the high-temperature air and is heated, it is output from the first chilled water outlet of the first front pipe box and returns to the chiller unit through the second chilled water inlet, forming a chilled water circulation circuit. After gas-liquid separation, the low-temperature air enters the second tube bundle from the second air inlet of the second front tube box. After heat exchange between the low-temperature air and the high-temperature air, the heated low-temperature air is output from the second air outlet of the second rear tube box and enters the fermentation process. High-temperature air supplied from the second outlet pipe enters the second shell through the hot air inlet. After heat exchange between the high-temperature air and the low-temperature air, the cooled high-temperature air is output from the hot air outlet and supplied to the first outlet pipe. It is first cooled and dehumidified by the first heat exchanger, and then heated by the second heat exchanger to produce fermentation air.

20. The method for preparing fermentation air as described in claim 19, characterized in that: The high-temperature air output by the air compressor is 160℃. The high-temperature air is cooled to 140℃ through the third heat exchanger, then cooled to 30-40℃ through the circulating water of the first heat exchanger, then cooled to below 25℃ through the chilled water of the first heat exchanger, and then the air humidity is reduced by the vapor-liquid separator. Finally, it is heated to 40-45℃ through the second heat exchanger to produce fermentation air.

21. The method for preparing fermentation air as described in claim 19, characterized in that: The temperature of the hot water before it is delivered to the third heat exchanger is 70℃, and the temperature of the hot water coming out of the third heat exchanger is 90℃.

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