Energy-saving temperature control system for liquid biological fermentation

Abstract

The utility model provides an energy-saving temperature control system for liquid biological fermentation, which comprises a cooling tower, a fermentation tank, a cooling-water machine and a heat exchanger, the cooling tower is connected with the cooling-water machine and the heat exchanger, the cooling-water machine is connected with the heat exchanger, the heat exchanger is connected with the fermentation tank, and the fermentation tank is connected with the cooling-water machine. And the fermentation tank is connected with the cooling tower. According to the energy-saving temperature control system for liquid biological fermentation, the mode of cooling by the cooling tower and supplementary cooling by the cooling-water machine is adopted, circulating water is subjected to primary cooling by the cooling tower and then is subjected to supplementary cooling by the cooling-water machine, and compared with cooling by the cooling tower alone, the energy-saving temperature control system has the advantages that the cooling efficiency is greatly improved; the temperature control system provided by the utility model meets three modes of low temperature, medium temperature and high temperature of liquid biological fermentation culture temperature, can meet the requirement of fermentation cooling, and is lower in total power consumption and more energy-saving compared with a single cooling-water machine for cooling.

Description

Technical Field

[0001] The utility model relates to the biological fermentation industry, in particular to an energy-saving temperature control system for liquid biological fermentation. Background Technique

[0002] At present, the liquid biological fermentation culture temperature is divided into three types: low temperature, medium temperature and high temperature. Low temperature fermentation refers to the fermentation culture temperature controlled between 25-30 °C, which is called low temperature fermentation. For example, yeast fermentation is at 29 °C, medium temperature fermentation temperature is controlled between 31-35 °C, such as mold fermentation at 34 °C, high temperature fermentation temperature is controlled between 36-42 °C, such as Bacillus subtilis fermentation at 37 °C, and thermophilic Bacillus licheniformis fermentation at 41 °C. At present, the high temperature fermentation temperature control process generally adopts the circulating water cooling tower cooling process. After the circulating water and the fermentation tank exchange heat, its own temperature rises, and it is sprayed into a water film from top to bottom on the cooling tower. The cooling tower fan blows air from bottom to top, and the two exchange heat to take away the heat of the circulating water, so that the temperature of the circulating water is reduced. However, the cooling efficiency of the cooling tower is affected by the outdoor ambient temperature. In the case where the temperature difference is greater than 10 °C, generally, the maximum temperature reduction can be 5 °C. The low-temperature circulating water after the heat is taken away by the atmosphere cools the fermentation broth again (at the same time, one-thousandth of the water is evaporated or drifted away per hour). When the water is evaporated, it absorbs a large amount of heat, so that the circulating water is cooled, and the purpose of stabilizing the fermentation culture temperature is achieved. The cooling water required for low-temperature fermentation needs to be controlled below 20 °C to ensure that the low-temperature fermentation temperature is controlled between 28-30 °C. When the ambient temperature is above 30 °C, the cooling tower cannot achieve this, and currently, only a chiller can be used to prepare cold water to cool the low-temperature fermentation. The heat generated during the refrigeration process of the chiller is cooled by the circulating water cooling tower; in spring, summer and autumn, in the central and southern regions, medium temperature fermentation cannot complete the temperature control only by the cooling of the circulating water cooling tower.

[0003] In addition, for high-temperature fermentation at 37°C, a cooling tower is used for temperature reduction. For every 100 tons of water per hour, approximately a 5.5KW cooling tower fan and a circulation pump with a flow rate of 100m3 / h and a head of 32m and a power of 11KW are required. The total power for every 100 tons of water per hour is 16.5KW. When the water temperature is reduced from 30°C to 25°C, it can ensure the fermentation temperature of 37°C for medium-temperature fermentation. For low-temperature fermentation at 29°C, a water temperature below 20°C is required. In the central and southern regions, it is impossible to achieve this with a cooling tower in spring, autumn, and summer, so a chiller needs to be used. To produce 100 tons of water at 7°C per hour, the power of the chiller is 100KW. At the same time, a 11KW 100m3 / h circulation water pump and a 5.5KW cooling tower fan are needed to take away the heat generated by the chiller. Then, an 11KW 100m3 / h chilled water circulation pump is used to cool the fermentation equipment. Using a chilled water system, the total power required for every 100 tons of water is 100KW + 11KW + 5.5KW + 11KW = 127.5KW. The energy consumption is 8 times that of medium-temperature fermentation at 37°C and high-temperature fermentation that only uses a cooling tower for cooling. However, when the fermentation culture temperature is low and the ambient temperature is high, it is impossible to cool down with a circulating water cooling tower, and only a chiller can be used. Summary of the Utility Model

[0004] For this reason, an object of the present utility model is to provide an energy-saving temperature control system for liquid biological fermentation to solve the problems mentioned in the background technology and overcome the deficiencies in the prior art.

[0005] To achieve the above object, the present utility model adopts the following technical solutions:

[0006] An energy-saving temperature control system for liquid biological fermentation includes a cooling tower and a fermentation tank, and also includes a chiller and a heat exchanger. The cooling tower is connected to the chiller and the heat exchanger. The chiller is connected to the heat exchanger. The heat exchanger is connected to the fermentation tank. The fermentation tank is connected to the cooling tower.

[0007] Further, the cooling tower includes a first cooling tower and a second cooling tower. The first cooling tower is respectively connected to the heat exchanger and the fermentation tank. The second cooling tower is connected to the chiller.

[0008] Further, the first cooling tower and the heat exchanger are connected by a first water pipe, and a first circulation pump is provided on the first water pipe.

[0009] Further, the heat exchanger and the fermentation tank are connected by a second water pipe, and the fermentation tank and the first cooling tower are connected by a third water pipe. A temperature detection device is provided on the second water pipe, and the temperature detection device is used to detect the temperature of the cooling water in the second water pipe.

[0010] Further, the second cooling tower is connected to the chiller through a fourth water pipe and a fifth water pipe, and a second circulating water pump is provided on the fourth water pipe.

[0011] Further, the heat exchanger is connected to the chiller through a sixth water pipe. A water tank is provided between the heat exchanger and the chiller. The water tank is connected to the heat exchanger through a seventh water pipe, and the water tank is connected to the chiller through an eighth water pipe. A third circulating water pump is provided on the seventh water pipe.

[0012] Further, the system further includes a PLC control unit, and the PLC control unit is communicatively connected to the second circulating water pump, the third circulating water pump, the temperature detection device, the chiller, and the second cooling tower respectively.

[0013] Further, the chiller is frequency-adjustable.

[0014] Therefore, the present utility model has the following beneficial effects:

[0015] The energy-saving temperature control system for liquid biological fermentation of the present utility model adopts a cooling tower cooling + chiller supplementary cooling mode. The cooling tower performs primary cooling on the circulating water, and then the chiller performs supplementary cooling. Compared with cooling solely through the cooling tower, the temperature control system of the present utility model meets the low-temperature, medium-temperature, and high-temperature modes required for liquid biological fermentation cultivation, can meet the fermentation cooling needs, and at the same time, compared with cooling solely by the chiller, the total power consumed by the temperature control system of the present utility model is lower, and it is more energy-saving.

[0016] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0018] Figure 1 is a schematic structural diagram of the system of the present utility model;

[0019] Figure 2 is a heat exchange schematic diagram of the improved temperature control system for implementing the cooling process in the embodiment of the present utility model.

[0020] In the figure: 1, fermentation tank; 2, chiller; 3, heat exchanger; 4, first cooling tower; 5, second cooling tower; 6, first water pipe; 7, first circulating water pump; 8, second water pipe; 9, temperature detection device; 10, third water pipe; 11, fourth water pipe; 12, fifth water pipe; 13, second circulating water pump; 14, sixth water pipe; 15, water tank; 16, seventh water pipe; 17, eighth water pipe; 18, third circulating water pump; 19, PLC control unit. Detailed implementation mode

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as a limitation to the present invention.

[0022] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] As Figure 1 shown, an energy-saving temperature control system for liquid biological fermentation includes a cooling tower and a fermentation tank 1, and also includes a chiller 2 and a heat exchanger 3. The cooling tower is connected to the chiller 2 and the heat exchanger 3, the chiller 2 is connected to the heat exchanger 3, the heat exchanger 3 is connected to the fermentation tank 1, and the fermentation tank 1 is connected to the cooling tower.

[0024] Based on the problem that in spring, autumn and summer, when the ambient temperature is above 25°C, the circulating water of the cooling tower cannot be used to cool down during normal temperature fermentation and medium temperature fermentation, and the chiller 2 must be used for cooling. Due to the fact that the ambient temperature changes by about 10°C in 24 hours every day and about 30°C in 4 seasons of a year, the heat that can be taken away by low-temperature air energy can be utilized in the low-temperature winter environment. When the ambient temperature rises and cannot meet the cooling requirement, the chiller 2 is used for cooling instead.

[0025] An energy-saving temperature control system for liquid biological fermentation of the present utility model adopts a mode of cooling tower cooling + chiller 2 supplementary cooling. The cooling tower cools the circulating water at the first stage, and then the chiller 2 conducts supplementary cooling. Compared with cooling solely by the cooling tower, the temperature control system of the present utility model meets the low-temperature, medium-temperature, and high-temperature modes of the liquid biological fermentation culture temperature, can meet the fermentation cooling requirements, and at the same time, compared with cooling solely by the chiller 2, the total power consumed by the temperature control system of the present utility model is lower and it is more energy-saving.

[0026] Furthermore, the cooling tower includes a first cooling tower 4 and a second cooling tower 5. The first cooling tower 4 is respectively connected to the heat exchanger 3 and the fermentation tank 1, and the second cooling tower 5 is connected to the chiller 2.

[0027] Furthermore, the first cooling tower 4 and the heat exchanger 3 are connected through a first water pipe 6, and a first circulating water pump 7 is provided on the first water pipe 6.

[0028] Furthermore, the heat exchanger 3 and the fermentation tank 1 are connected through a second water pipe 8, and the fermentation tank 1 and the first cooling tower 4 are connected through a third water pipe 10. A temperature detection device 9 is provided on the second water pipe 8, and the temperature detection device 9 is used to detect the temperature of the cooling water in the second water pipe 8.

[0029] The temperature detection device 9 can be a temperature sensor, a thermometer, an online temperature detection probe, etc.

[0030] Furthermore, the second cooling tower 5 and the chiller 2 are connected through a fourth water pipe 11 and a fifth water pipe 12, and a second circulating water pump 13 is provided on the fourth water pipe 11.

[0031] Furthermore, the heat exchanger 3 and the chiller 2 are connected through a sixth water pipe 14. A water tank 15 is provided between the heat exchanger 3 and the chiller 2. The water tank 15 is connected to the heat exchanger 3 through a seventh water pipe 16, and the water tank 15 is connected to the chiller 2 through an eighth water pipe 17. A third circulating water pump 18 is provided on the seventh water pipe 16.

[0032] Furthermore, the system also includes a PLC control unit 19. The PLC control unit 19 is respectively in communication connection with the second circulating water pump 13, the third circulating water pump 18, the temperature detection device 9, the chiller 2, and the second cooling tower 5.

[0033] The PLC control unit 19 is in communication connection with the second circulating water pump 13, the third circulating water pump 18, the temperature detection device 9, the chiller 2, and the second cooling tower 5, and can send data to each other and realize the control of the second circulating water pump 13, the third circulating water pump 18, the chiller 2, and the second cooling tower 5.

[0034] Furthermore, the chiller 2 is frequency-adjustable.

[0035] Such asFigure 1 As shown, the solid lines with arrows in the figure represent each water pipe, the arrows represent the flow direction of water in the water pipes, and the dashed lines represent the communication connections between the devices.

[0036] As Figure 1 shown, in an embodiment of an energy-saving temperature control system for liquid biological fermentation of the present utility model, when the fermentation equipment needs to be cooled down, the first circulation water pump 7 is started, and the first cooling tower 4 is started. An on-line temperature detection probe is installed on the cooling water pipe, i.e., the second water pipe 8, which enters the fermentation equipment, and communicates with the PLC control unit 19. The temperature of the circulating water is detected on the PLC. When the temperature is higher than the set temperature, the third circulation water pump 18 is started, the second circulation water pump 13 and the second cooling tower 5 are started, and then the chiller 2 is started (the chiller 2 is adjustable by frequency conversion). The chiller 2 can automatically adjust the load or unload operation according to the circulating water temperature detected by the on-line temperature detection probe, achieving the maximum energy-saving mode. When the season changes, in winter, when the first cooling tower 4 can completely reduce the circulating water temperature below 20°C and can meet the fermentation cooling requirement, the chiller 2 system can be shut down.

[0037] As Figure 2 shown, in an embodiment, it is changed from the original separate chiller cooling to the cooling tower cooling + chiller supplementary cooling process. The cooling tower reduces the circulating water from 25°C to 20°C, and then the chiller supplements the cooling to 15°C. 11KW 100 tons / hour water circulation pump + 5.5KW cooling tower fan + 50KW chiller power + 5.5KW 30 tons / hour cold water circulation exchange pump + 5.5KW chiller circulating water cooling pump + 5.5KW chiller cooling tower fan = 83KW. The total power consumed is 65% of the power consumption of the normal temperature fermentation cooling system of 127.5KW, saving 35% of energy.

[0038] In the description of this specification, the descriptions with reference to the terms "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean 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 utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0039] It is not difficult for those skilled in the art to understand that the present utility model includes any combination of the above-mentioned utility model content and specific implementation parts of the specification and the parts shown in the drawings. Due to space limitations and to make the specification concise, the various schemes formed by these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0040] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An energy-saving temperature control system for liquid biological fermentation, comprising a cooling tower and a fermentation tank, characterized in that: It also includes a chiller and a heat exchanger. The cooling tower is connected to the chiller and the heat exchanger. The chiller is connected to the heat exchanger. The heat exchanger is connected to the fermentation tank. The fermentation tank is connected to the cooling tower.

2. The energy-saving temperature control system for liquid biological fermentation according to claim 1, characterized in that: The cooling tower comprises a first cooling tower and a second cooling tower, the first cooling tower is connected to the heat exchanger and the fermentation tank respectively, and the second cooling tower is connected to the chiller.

3. The energy-saving temperature control system for liquid biological fermentation according to claim 2, characterized in that: The first cooling tower and the heat exchanger are connected via a first water pipe, and a first circulating water pump is provided on the first water pipe.

4. The energy-saving temperature control system for liquid biological fermentation according to claim 3, characterized in that: The heat exchanger is connected to the fermentation tank via a second water pipe, the fermentation tank is connected to the first cooling tower via a third water pipe, and a temperature detection device is provided on the second water pipe, and the temperature detection device is used to detect the temperature of cooling water in the second water pipe.

5. The energy-saving temperature control system for liquid biological fermentation according to claim 4, characterized in that: The second cooling tower is connected to the chiller via a fourth water pipe and a fifth water pipe, and a second circulating water pump is disposed on the fourth water pipe.

6. The energy-saving temperature control system for liquid biological fermentation according to claim 5, characterized in that: The heat exchanger is connected to the chiller through the sixth water pipe, a water tank is provided between the heat exchanger and the chiller, the water tank is connected to the heat exchanger through the seventh water pipe, the water tank is connected to the chiller through the eighth water pipe, and a third circulating water pump is provided on the seventh water pipe.

7. The energy-saving temperature control system for liquid biological fermentation according to claim 6, characterized in that: It also includes a PLC control unit, which is communicatively connected with the second circulating water pump, the third circulating water pump, the temperature detection device, the chiller, and the second cooling tower respectively.

8. The energy-saving temperature control system for liquid biological fermentation according to claim 1, characterized in that: The chiller is variable frequency regulated.

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