Continuous crystallization system suitable for lysine fermentation liquor

Abstract

A continuous crystallization system suitable for lysine fermentation liquor comprises a storage tank, a first delivery pump, a first-effect falling film evaporator, a second delivery pump, a second-effect falling film evaporator, a third delivery pump, a forced circulation evaporation crystallizer, a crystal separator, a centrifugal machine and a crystal storage tank, and an air inlet of the first-effect falling film evaporator is connected with a steam delivery pipeline through a pipeline. According to the continuous crystallization system suitable for the lysine fermentation liquor, after the lysine fermentation liquor is pre-concentrated by adopting the first-effect falling film evaporator and the second-effect falling film evaporator, the lysine fermentation liquor with higher concentration is finally concentrated and crystallized by the forced circulation evaporation crystallizer, so that excessive scale deposition and excessive energy consumption can be effectively avoided; the crystallization efficiency is high, and the product granularity is uniform; the centrifugal machine is adopted to separate liquid in crystals, the product purity is improved, the separated liquid is conveyed to the forced circulation evaporation crystallizer again to be treated, and the product yield of the lysine fermentation liquor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of bioengineering technology, especially relate to a continuous crystallization system suitable for lysine fermentation liquor. BACKGROUND

[0002] Lysine is an essential amino acid, chemical name is 2,6-diaminohexanoic acid, and its production mainly relies on microbial fermentation technology, wherein the commonly used process is to utilize escherichia coli and other microorganisms to carry out efficient lysine synthesis.Lysine is widely used in food, medicine and feed and other fields, especially in the field of corn deep processing, and the production process of lysine has made remarkable progress, and through optimization of fermentation conditions and strain breeding, the yield and purity of lysine are significantly improved.

[0003] In the production process of lysine, the crystallization step is a key link, directly affecting the purity and yield of product.However, the traditional crystallization method generally has problems such as easy fouling, high energy consumption, low crystallization efficiency and uneven product particle size.

[0004] Therefore, in view of the problems existing in the prior art, it is necessary to design a continuous crystallization system suitable for lysine fermentation liquor to solve the above problems.

[0005] It should be noted that the above introduction to the technical background is only to facilitate the clear and complete description of the technical scheme of the utility model, and to facilitate the understanding of the skilled in the art, and the above content cannot be considered as known by the skilled in the art only because these contents are described in the background of the utility model. CONTENT OF THE UTILITY MODEL

[0006] In order to overcome the above problems in the prior art, the utility model aims at disclosing a continuous crystallization system suitable for lysine fermentation liquor, which is used to solve the problems such as easy fouling, high energy consumption, low crystallization efficiency and uneven product particle size in the production process of lysine.

[0007] The utility model discloses a kind of continuous crystallization systems suitable for lysine fermentation liquor, including storage tank, the discharge outlet of storage tank is connected with the feed inlet of first conveying pump by pipeline, the discharge outlet of first conveying pump is connected with the feed inlet of one effect falling film evaporator by pipeline, the discharge outlet of one effect falling film evaporator is connected with the feed inlet of second conveying pump by pipeline, the discharge outlet of second conveying pump is connected with the feed inlet of two effect falling film evaporator by pipeline, the discharge outlet of two effect falling film evaporator is connected with the feed inlet of third conveying pump by pipeline, the discharge outlet of third conveying pump is connected with the feed inlet of forced circulation evaporation crystallizer by pipeline, the discharge outlet of forced circulation evaporation crystallizer is connected with the feed inlet of crystallization separator by pipeline;The mother liquor outlet of crystallization separator is connected with the feed inlet of third conveying pump by pipeline, for evaporating treatment to liquid after crystallization again, improve raw material utilization rate;The crystal outlet of crystallization separator is connected with the feed inlet of centrifuge by pipeline, the liquid outlet of centrifuge is connected with the feed inlet of third conveying pump by pipeline, the solid discharge outlet of centrifuge is connected with the feed inlet of crystal storage tank by pipeline, utilize centrifuge to separate liquid in crystalline body, improve product purity.

[0008] The gas inlet of one effect falling film evaporator is connected with steam conveying pipeline by pipeline, the exhaust port of one effect falling film evaporator is connected with the gas inlet of two effect falling film evaporator by pipeline, the exhaust port of two effect falling film evaporator is connected with the gas inlet of forced circulation evaporation crystallizer by pipeline.

[0009] Preferred technical solutions: the discharge outlet of one effect falling film evaporator is also connected with the feed inlet of first conveying pump by pipeline, the discharge outlet of two effect falling film evaporator is also connected with the feed inlet of second conveying pump by pipeline, the discharge outlet of forced circulation evaporation crystallizer is also connected with the feed inlet of third conveying pump by pipeline, so that lysine fermentation liquor can be circulated and handled at one effect falling film evaporator and two effect falling film evaporator, to further improve the concentration of lysine fermentation liquor.

[0010] Preferred technical solutions: the exhaust port of forced circulation evaporation crystallizer is connected to emptying pipeline, and the condensed water outlet of forced circulation evaporation crystallizer is connected to blowdown pipeline.

[0011] Preferred technical solutions: a first steam jet compressor is arranged on the pipeline between the exhaust port of one effect falling film evaporator and the gas inlet of two effect falling film evaporator, and a second steam jet compressor is arranged on the pipeline between the exhaust port of two effect falling film evaporator and the gas inlet of forced circulation evaporation crystallizer, to improve the pressure and temperature of the conveyed steam.

[0012] Preferred technical solutions: valves are arranged on the pipelines in the continuous crystallization system, to facilitate the control of the continuous crystallization system.

[0013] Thanks to the above technical solutions, the utility model has the following beneficial effects compared with the prior art:

[0014] The utility model discloses a kind of continuous crystallization systems suitable for lysine fermentation liquor, pre-concentrates lysine fermentation liquor using one-effect falling film evaporator and two-effect falling film evaporator, the lysine fermentation liquor with greater concentration is concentrated crystallization finally by forced circulation evaporation crystallizer, can effectively avoid scale formation too much and energy consumption too large, simultaneously crystallization efficiency is high, product granularity is uniform;Liquid in crystalline body is separated using centrifuge, improve product purity, and separated liquid is transported to forced circulation evaporation crystallizer again to process, improve the product yield of lysine fermentation liquor. BRIEF DESCRIPTION OF DRAWINGS

[0015] To more clearly illustrate the embodiment of the utility model or the technical scheme in prior art, the following will be a brief introduction to the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0016] Figure 1 For the continuous crystallization system structure schematic diagram suitable for lysine fermentation liquor of the utility model.

[0017] In the above drawing, 1, storage tank;2, one-effect falling film evaporator;3, two-effect falling film evaporator;4, forced circulation evaporation crystallizer;5, crystallization separator;6, centrifuge;7, crystal storage tank;8, first conveying pump;9, second conveying pump;10, third conveying pump;11, first steam jet compressor;12, second steam jet compressor. DETAILED DESCRIPTION

[0018] The following is by specific embodiment to illustrate the embodiment of the utility model, those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.

[0019] It should be noted that the specification and claims of the present application and the above-mentioned terms "first", "second" and the like in the drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to describe the embodiments of the present application herein. In addition, the terms "include" and "have" and their synonyms are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0022] Furthermore, the terms "installation," "setting," "equipped with," "connection," "linking," "fitting," and "fitting" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Similarly, "fitting" can mean completely or partially fitted. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] Example:

[0025] like Figure 1 As shown, this utility model discloses a continuous crystallization system suitable for lysine fermentation broth, including a storage tank 1, a single-effect falling film evaporator 2, a double-effect falling film evaporator 3, a forced circulation evaporation crystallizer 4, a crystallization separator 5, a centrifuge 6, a crystal storage tank 7, a first transfer pump 8, a second transfer pump 9, and a third transfer pump 10. The main components of this utility model will be described in detail below:

[0026] like Figure 1As shown, the outlet of storage tank 1 is connected to the inlet of the first conveying pump 8 via a pipeline. The outlet of the first conveying pump 8 is connected to the inlet of the first-effect falling film evaporator 2 via a pipeline. The outlet of the first-effect falling film evaporator 2 is connected to the inlet of the second conveying pump 9 via a pipeline. The outlet of the second conveying pump 9 is connected to the inlet of the second-effect falling film evaporator 3 via a pipeline. The outlet of the second-effect falling film evaporator 3 is connected to the inlet of the third conveying pump 10 via a pipeline. The outlet of the third conveying pump 10 is connected to the... The feed inlet of the forced circulation evaporator crystallizer 4 is connected by a pipeline. The discharge outlet of the forced circulation evaporator crystallizer 4 is connected by a pipeline to the feed inlet of the crystallizer separator 5. The mother liquor outlet of the crystallizer separator 5 is connected by a pipeline to the feed inlet of the third transfer pump 10. The crystal outlet of the crystallizer separator 5 is connected by a pipeline to the feed inlet of the centrifuge 6. The liquid outlet of the centrifuge 6 is connected by a pipeline to the feed inlet of the third transfer pump 10. The solid discharge outlet of the centrifuge 6 is connected by a pipeline to the feed inlet of the crystal storage tank 7.

[0027] like Figure 1 As shown, the air inlet of the first-effect falling film evaporator 2 is connected to the steam delivery pipeline through a pipeline, the exhaust port of the first-effect falling film evaporator 2 is connected to the air inlet of the second-effect falling film evaporator 3 through a pipeline, and the exhaust port of the second-effect falling film evaporator 3 is connected to the air inlet of the forced circulation evaporation crystallizer 4 through a pipeline.

[0028] The method and principle of this utility model are as follows: In use, the lysine fermentation broth is pre-concentrated by passing through a first-effect falling film evaporator 2 and a second-effect falling film evaporator 3 in sequence. The high heat exchange capacity of the falling film evaporator is used to improve the concentration efficiency of the lysine fermentation broth and reduce the energy consumption during concentration. Then, the concentrated lysine fermentation broth is sent to a forced circulation evaporation crystallizer 4 for crystallization treatment to improve crystallization efficiency and quality. Then, the lysine fermentation broth treated by the forced circulation evaporation crystallizer 4 is sent to a crystallization separator 5 for solid-liquid separation. The liquid after solid-liquid separation is sent back to the forced circulation evaporation crystallizer 4 for circulation treatment to improve the crystallization rate. The crystals after solid-liquid separation are sent to a centrifuge 6 to further remove residual liquid in the crystals and improve crystallization purity. The separated liquid is recovered to the forced circulation evaporation crystallizer 4 for circulation treatment to improve the crystallization rate. Finally, the crystals are sent to a crystal storage tank 7. In the above process, the steam flows sequentially through the first-effect falling film evaporator 2, the second-effect falling film evaporator 3, and the forced circulation evaporation crystallizer 4, and the temperature gradually decreases. That is, as the concentration of lysine fermentation liquid increases, the evaporation temperature is appropriately reduced, which can reduce scale buildup during operation and make the crystallization particle size more uniform.

[0029] like Figure 1As shown, in order to improve the crystallization efficiency, the outlet of the first falling film evaporator 2 is also connected with the inlet of the first conveying pump 8 through a pipeline, the outlet of the second falling film evaporator 3 is also connected with the inlet of the second conveying pump 9 through a pipeline, and the outlet of the forced circulation evaporative crystallizer 4 is also connected with the inlet of the third conveying pump 10 through a pipeline, so that the crystallization efficiency of the lysine fermentation liquid is improved through the circulation operation.

[0030] As shown in the figure, Figure 1 The exhaust outlet of the forced circulation evaporative crystallizer 4 is connected to an exhaust pipeline, and the condensate outlet of the forced circulation evaporative crystallizer 4 is connected to a blowdown pipeline, so as to avoid environmental pollution.

[0031] As shown in the figure, Figure 1 In order to improve the conveying temperature and pressure of the steam, the pipeline between the exhaust outlet of the first falling film evaporator 2 and the inlet of the second falling film evaporator 3 is provided with a first steam jet compressor 11, and the pipeline between the exhaust outlet of the second falling film evaporator 3 and the inlet of the forced circulation evaporative crystallizer 4 is provided with a second steam jet compressor 12.

[0032] As shown in the figure, Figure 1 In order to facilitate the control of the continuous crystallization system, the pipelines in the continuous crystallization system are all provided with valves.

[0033] Finally, it should be noted that the above is only the preferred embodiment of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A continuous crystallization system suitable for lysine fermentation broth, characterized in that, include: The storage tank (1) has its outlet connected to the inlet of the first conveying pump (8) via a pipeline. The outlet of the first conveying pump (8) is connected to the inlet of the first-effect falling film evaporator (2) via a pipeline. The outlet of the first-effect falling film evaporator (2) is connected to the inlet of the second conveying pump (9) via a pipeline. The outlet of the second conveying pump (9) is connected to the inlet of the second-effect falling film evaporator (3) via a pipeline. The outlet of the second-effect falling film evaporator (3) is connected to the inlet of the third conveying pump (10) via a pipeline. The outlet of the third conveying pump (10) is connected to the inlet of the first conveying pump (8) via a pipeline. The feed inlet of the forced circulation evaporation crystallizer (4) is connected by a pipeline. The discharge outlet of the forced circulation evaporation crystallizer (4) is connected by a pipeline to the feed inlet of the crystallization separator (5). The mother liquor outlet of the crystallization separator (5) is connected by a pipeline to the feed inlet of the third conveying pump (10). The crystal outlet of the crystallization separator (5) is connected by a pipeline to the feed inlet of the centrifuge (6). The liquid outlet of the centrifuge (6) is connected by a pipeline to the feed inlet of the third conveying pump (10). The solid discharge outlet of the centrifuge (6) is connected by a pipeline to the feed inlet of the crystal storage tank (7). The inlet of the first-effect falling film evaporator (2) is connected to the steam delivery pipeline through a pipeline, the outlet of the first-effect falling film evaporator (2) is connected to the inlet of the second-effect falling film evaporator (3) through a pipeline, and the outlet of the second-effect falling film evaporator (3) is connected to the inlet of the forced circulation evaporation crystallizer (4) through a pipeline.

2. The continuous crystallization system for lysine fermentation broth according to claim 1, characterized in that: The outlet of the first-effect falling film evaporator (2) is also connected to the inlet of the first conveying pump (8) through a pipeline. The outlet of the second-effect falling film evaporator (3) is also connected to the inlet of the second conveying pump (9) through a pipeline. The outlet of the forced circulation evaporator crystallizer (4) is also connected to the inlet of the third conveying pump (10) through a pipeline.

3. The continuous crystallization system for lysine fermentation broth according to claim 1, characterized in that: The exhaust port of the forced circulation evaporator (4) is connected to the vent pipe, and the condensate outlet of the forced circulation evaporator (4) is connected to the sewage pipe.

4. The continuous crystallization system for lysine fermentation broth according to claim 1, characterized in that: A first steam jet compressor (11) is provided on the pipeline between the exhaust port of the first-effect falling film evaporator (2) and the inlet of the second-effect falling film evaporator (3), and a second steam jet compressor (12) is provided on the pipeline between the exhaust port of the second-effect falling film evaporator (3) and the inlet of the forced circulation evaporator crystallizer (4).

5. A continuous crystallization system suitable for lysine fermentation broth according to claim 1, characterized in that: Valves are installed on all pipelines within the continuous crystallization system.

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