A protein-containing clear liquid treatment system

Abstract

This application discloses a protein-containing clarified liquid treatment system, relating to the field of ethanol preparation, comprising: a protein precipitation tank, into which a protein-containing clarified liquid enters for precipitation to obtain protein precipitate and a first clarified liquid; a preheater, into which the first clarified liquid enters for preheating to obtain a second clarified liquid; a pipeline mixer, into which the second clarified liquid enters and mixes with an antifoaming agent to eliminate foam in the second clarified liquid to obtain a third clarified liquid; a gas-liquid separator, used to discharge gas from the third clarified liquid to obtain a fourth clarified liquid; a protein separation tower, used to perform a primary separation of proteins in the third clarified liquid to obtain a fourth clarified liquid; a separator, used to perform a secondary separation of proteins in the fourth clarified liquid to obtain a fifth clarified liquid; and a protein separation tank, into which the fifth clarified liquid enters for precipitation to obtain the target liquid. This system effectively removes protein from the clarified liquid.

Description

Technical Field

[0001] This application relates to the field of ethanol preparation, and more particularly to a protein-containing clear liquid treatment system. Background Technology

[0002] Using CO, CO2, and H2 gases from steel plant converter gas, metallurgical tail gas, calcium carbide gas, and petroleum refining tail gas as raw materials, and employing microbial fermentation to produce ethanol, is a new technology developed in recent years. This technology reduces particulate matter and CO2 emissions, is highly economical, and has a high utilization rate. The fermentation mash produced by this technology is divided into mash containing microorganisms and clear liquid containing soluble proteins. Currently, the mash containing microorganisms is used to produce high-protein feed after separating ethanol, while a portion of the clear liquid containing soluble proteins is recycled back to the fermentation system for use in fermentation feed formulation after separating ethanol.

[0003] Existing ethanol production processes and systems cannot remove proteins from fermentation recycled water, affecting the amount of recycled water and the stability of fermentation operation. Summary of the Invention

[0004] The purpose of this application is to provide a protein-containing liquid treatment system to solve, to some extent, the technical problem of the inability to remove protein from fermentation recycled water.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] A first aspect of this application provides a protein-containing clear liquid treatment system, comprising: a protein precipitation tank, wherein a protein-containing clear liquid is introduced into the protein precipitation tank through an inlet for precipitation to obtain protein precipitate and a first clear liquid; a preheater connected to the protein precipitation tank, wherein the first clear liquid enters the preheater through an inlet for preheating to obtain a second clear liquid; and a pipeline mixer, wherein one pipeline of the pipeline mixer is connected to the preheater, and an antifoaming agent is introduced into one pipeline of the pipeline mixer, wherein the second clear liquid enters the pipeline mixer and mixes with the antifoaming agent to eliminate the second clear liquid. The foam in the liquid is removed to obtain a third clear liquid; a gas-liquid separator is connected to one pipe of the pipeline mixer, and the gas-liquid separator is used to discharge the gas in the third clear liquid to obtain a fourth clear liquid; a protein separation tower is connected to the outlet of the gas-liquid separator, and the protein separation tower is used to perform a primary separation of proteins in the third clear liquid to obtain a fourth clear liquid; a separator is connected to the protein separation tower, and the separator performs a secondary separation of proteins in the fourth clear liquid to obtain a fifth clear liquid; a protein separation tank is connected to the separator, and the fifth clear liquid enters the protein separation tank for precipitation to obtain the target liquid.

[0007] In some embodiments, the protein precipitation tank is provided with: a precipitation baffle fixed to the bottom of the protein precipitation tank and located in the middle of the protein precipitation tank, the precipitation baffle separating the protein precipitation zone and the clear liquid zone, the inlet of the protein precipitation tank extending into the protein precipitation zone, the clear liquid containing protein precipitating in the protein precipitation zone, and the upper clear liquid crossing the precipitation baffle into the clear liquid zone; a protein outlet disposed in the protein precipitation zone; and a clear liquid outlet disposed in the clear liquid zone.

[0008] In some embodiments, the protein precipitation tank is provided with an expansion pipe at the inlet, and the expansion pipe is connected to the bottom of the precipitation side of the protein precipitation tank.

[0009] In some embodiments, the protein precipitation tank has a sloping bottom.

[0010] In some embodiments, a delivery pump is provided between the clear liquid outlet and the preheater to deliver the first clear liquid to the preheater.

[0011] In some embodiments, the preheater is a wide-channel plate heat exchanger or a multi-pass tube heat exchanger.

[0012] In some embodiments, the gas-liquid separator is a negative pressure tank.

[0013] In some embodiments, the gas-liquid separator is further provided with a scraper-type sight glass for observing the foaming situation inside the separator.

[0014] In some embodiments, the protein separation tower is a solid valve tray tower.

[0015] In some embodiments, the separator is a continuous discharge centrifuge.

[0016] In some embodiments, the protein separation vessel is a conical-bottom vessel.

[0017] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0018] The protein-containing clear liquid treatment system disclosed in this application can effectively remove protein from the clear liquid by sequentially passing the protein-containing clear liquid through a protein precipitation tank, a preheater, a pipeline mixer, a gas-liquid separator, a protein separation tower, and a protein separation tank, thereby ensuring the stability of fermentation operation and ensuring that the protein content of the fermentation recycled water meets the standards. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a protein-containing clear liquid treatment system according to an embodiment.

[0021] The reference numerals in the attached diagrams are explained as follows: 100, protein precipitation tank; 110, clear liquid containing protein; 120, expansion pipe; 130, precipitation baffle; 140, protein outlet; 150, transfer pump; 200, preheater; 300, pipeline mixer; 400, gas-liquid separator; 500, protein separation tower; 600, separator; 610, concentrated liquid pipeline; 700, protein separation tank; 710, protein discharge port; 800, target liquid. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connection," "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Please see Figure 1 .

[0027] Figure 1 This is a schematic diagram of a protein-containing clear liquid treatment system according to an embodiment of this application. As shown in the figure, the system includes: a protein precipitation tank 100, into which a protein-containing clear liquid 110 enters for precipitation, yielding protein precipitate and a first clear liquid; a preheater 200 connected to the protein precipitation tank 100, into which the first clear liquid enters for preheating, yielding a second clear liquid; and a pipeline mixer 300, with one pipeline connected to the preheater 200, through which a defoamer is introduced, into which the second clear liquid enters and mixes with the defoamer to eliminate any staleness. The foam in the second clear liquid is removed to obtain a third clear liquid; a gas-liquid separator 400 is connected to one pipe of the pipe mixer 300, and the gas-liquid separator 400 is used to discharge the gas in the third clear liquid to obtain a fourth clear liquid; a protein separation tower 500 is connected to the outlet of the gas-liquid separator 400, and the protein separation tower 500 is used to perform a primary separation of proteins in the third clear liquid to obtain a fourth clear liquid; a separator 600 is connected to the protein separation tower 500, and the protein in the fourth clear liquid is further separated by the separator 600 to obtain a fifth clear liquid; a protein separation tank 700 is connected to the separator 600, and the fifth clear liquid enters the protein separation tank 700 for precipitation to obtain the target liquid 800. By sequentially passing the protein-containing clear liquid 110 into the protein precipitation tank 100, preheater 200, pipeline mixer 300, gas-liquid separator 400, protein separation tower 500, and protein separation tank 700, the protein in the clear liquid can be effectively removed, ensuring the stability of fermentation operation and making the protein content of the fermentation recycled water meet the standards.

[0028] In some embodiments, the protein precipitation tank 100 is provided with: a precipitation baffle 130, fixed to the bottom of the protein precipitation tank 100 and located in the middle of the protein precipitation tank 100, the precipitation baffle 130 separating the protein precipitation zone and the clear liquid zone, the feed inlet of the protein precipitation tank 100 extending into the protein precipitation zone, the clear liquid 110 containing protein precipitating in the protein precipitation zone, and the upper clear liquid crossing the precipitation baffle 130 into the clear liquid zone; a protein discharge outlet 140 disposed in the protein precipitation zone; and a clear liquid discharge outlet disposed in the clear liquid zone.

[0029] In some embodiments, the protein precipitation tank 100 is provided with an expansion pipe 120 at the inlet, and the expansion pipe 120 is connected to the bottom of the precipitation side of the protein precipitation tank 100.

[0030] In some embodiments, the protein precipitation tank 100 is provided with a sloping bottom. Specifically, a sloping bottom is provided below both the protein precipitation area and the clear liquid area. The sloping bottom slopes from the middle of the protein precipitation tank 100 to both ends, and the angle between the sloping bottom and the bottom of the tank is 5° to 30°.

[0031] Specifically, the syngas containing CO and H2 as raw materials is bio-fermented to produce a clear liquid 110 containing 10-70 g / L ethanol and 0.1-1 g / L protein, which is then transported to a protein precipitation tank 100. Through the expansion pipe 120, the transport speed of the clear liquid is reduced, and it is evenly distributed on the sloping bottom surface of the protein precipitation zone. After 0.5-5 hours of precipitation, most of the fine proteins in the protein-containing fermentation clear liquid precipitate on the sloping bottom surface of the tank and move towards the lowest point of the tank wall under gravity, exiting the system through the protein discharge outlet 140. The upper clear liquid crosses the precipitation baffle 130 and enters the clear liquid zone. To prevent the baffle from deforming due to gravity on the precipitation side, fermentation liquid is injected simultaneously into the precipitation side and the clear liquid side of the protein precipitation tank 100 during the initial operation, and the liquid level in the tank is always kept higher than the baffle during operation.

[0032] In some embodiments, a delivery pump 150 is provided between the clear liquid outlet and the preheater 200, and the first clear liquid is delivered to the preheater 200 by the delivery pump 150.

[0033] In some embodiments, the preheater 200 is a wide-channel plate heat exchanger or a multi-pass tube heat exchanger.

[0034] Specifically, by setting up a preheater 200, the separation efficiency of protein, water, and ethanol is increased. The preheater 200 heats the first clear liquid to 65-75°C using a heat source of 70-85°C. If the heat source temperature is too high, it will accelerate the precipitation of soluble protein in the protein-containing clear liquid and accelerate the contamination of the preheater 200. If the heat source temperature is too low, it will not meet the requirements for bubble point feeding after being cooled by negative pressure in the gas-liquid separator 400.

[0035] In some embodiments, the defoamer is prepared using 95%-99.5% ethanol, water, and the defoamer itself, in a ratio of 10-15:20-30:0.5-1. Excessive defoamer concentration increases viscosity, affecting conveying efficiency, while insufficient concentration reduces the effectiveness of the defoamer. Ethanol is used to dissolve the defoamer, and water is used to control its concentration.

[0036] In some embodiments, the gas-liquid separator 400 is a negative pressure tank. During transport, the pressure of the protein-containing fermentation broth drops sharply, releasing dissolved gases such as CO and CO2 from the broth, thus improving the protein separation efficiency of the protein separation tower 500. The pressure of the gas-liquid separator 400 is -20 to -65 kPa.

[0037] In some embodiments, the gas-liquid separator 400 is further provided with a scraper-type sight glass for observing the foaming situation inside the separator.

[0038] In some embodiments, the protein separation tower 500 is a solid valve tray tower. This is to prevent protein from clogging the float valve or packing. In the protein separation tower 500, through gradual heating, separation, and concentration on each tray, trace amounts of solid protein and soluble protein dissolved in the protein-containing liquid are gradually separated from ethanol and some water, moving towards the bottom of the protein separation tower 500 and eventually accumulating there. It should be noted that heating causes soluble protein to precipitate in the liquid. To ensure complete precipitation of soluble protein, the bottom temperature of the protein separation tower 500 is 70-85°C. Too low a temperature results in incomplete protein precipitation, while too high a temperature can easily denature the protein, accelerating contamination of the trays and the heating unit of the protein separation tower 500, thus affecting operating efficiency.

[0039] In some embodiments, the separator 600 is a continuous discharge centrifuge. Under the powerful centrifugal force of the separator 600, most of the protein is separated from the supernatant. The protein is discharged through the concentrate pipe 610 of the separator 600, and the supernatant is transported to the final protein separation tank 700 after separation.

[0040] In some embodiments, the protein separator 700 is a conical-bottomed vessel. The angle of the cone is 45°-135°. The residence time of the fifth supernatant in the protein separator 700 is 0.5-5 hours. The protein precipitate is discharged from the protein discharge port 710 at the lower end of the protein separator 700.

[0041] In some embodiments, the target liquid 800 is recycled water with a protein content of 0-0.01 g / L, used as a fermentation ingredient.

[0042] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0043] The protein-containing clear liquid treatment system disclosed in this application can effectively remove protein from the clear liquid by sequentially passing the protein-containing clear liquid through a protein precipitation tank, a preheater, a pipeline mixer, a gas-liquid separator, a protein separation tower, and a protein separation tank, thereby ensuring the stability of fermentation operation and ensuring that the protein content of the fermentation recycled water meets the standards.

[0044] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A protein-containing clear liquid treatment system, characterized in that, include: A protein precipitation tank is used to precipitate protein precipitate and obtain a first clear liquid by passing fermentation broth containing protein into the protein precipitation tank through the feed inlet. A preheater is connected to the protein precipitation tank. The first clear liquid enters the preheater through the feed inlet of the preheater for preheating to obtain the second clear liquid. A pipeline mixer, one of its pipes being connected to the preheater, a defoamer being introduced into one of the pipes of the pipeline mixer, and the second clear liquid entering the pipeline mixer and mixing with the defoamer to eliminate foam in the second clear liquid, resulting in a third clear liquid; A gas-liquid separator is connected to a pipe of the pipe mixer, and the gas-liquid separator is used to discharge the gas in the third clear liquid to obtain a fourth clear liquid; A protein separation tower is connected to the outlet of the gas-liquid separator. The protein separation tower is used to separate the protein in the fourth clear liquid in one step to obtain the fifth clear liquid. A separator, connected to the protein separation tower, is used to perform a second separation of proteins in the fifth supernatant to obtain a sixth supernatant; A protein separation tank is connected to the separator. The sixth clear liquid enters the protein separation tank for precipitation to obtain the target liquid. The target liquid is recycled water with a protein content of 0-0.01 g / L; The preheater heats the first clear liquid to 65~75°C; The defoamer is prepared by mixing 95%~99.5% ethanol, water, and defoamer in a ratio of 10~15: 20~30: 0.5~1. The gas-liquid separator is a negative pressure tank; it discharges dissolved CO and CO2 gases from the protein-containing fermentation liquid, thereby improving the protein separation efficiency of the protein separation tower. The pressure of the gas-liquid separator is -20~-65 kPa; The bottom temperature of the protein separation column is 70~85℃; The sixth clear liquid is held in the protein separator for 0.5-5 hours.

2. The protein-containing clear liquid treatment system according to claim 1, characterized in that, The protein precipitation tank is equipped with: A sedimentation baffle is fixed to the bottom of the protein sedimentation tank and located in the middle of the protein sedimentation tank. The sedimentation baffle divides the protein sedimentation tank into a protein sedimentation zone and a clear liquid zone. The feed inlet of the protein sedimentation tank extends into the protein sedimentation zone, where the clear liquid containing protein precipitates. The upper clear liquid crosses the sedimentation baffle and enters the clear liquid zone. The protein outlet is located in the protein precipitation area; A clear liquid outlet is located in the clear liquid area.

3. The protein-containing clear liquid treatment system according to claim 1, characterized in that, The protein precipitation tank is equipped with an expansion pipe at the inlet, which is connected to the bottom of the precipitation side of the protein precipitation tank.

4. The protein-containing clear liquid treatment system according to claim 1, characterized in that, The protein precipitation tank has a sloping bottom.

5. The protein-containing clear liquid treatment system according to claim 2, characterized in that, A delivery pump is provided between the clear liquid outlet and the preheater, and the first clear liquid is delivered to the preheater by the delivery pump.

6. The protein-containing clear liquid treatment system according to claim 1, characterized in that, The gas-liquid separator is also equipped with a scraper-type sight glass for observing the foaming situation inside the tank.

7. The protein-containing clear liquid treatment system according to claim 1, characterized in that, The protein separation tower is a solid valve tray tower.

8. The protein-containing clear liquid treatment system according to claim 1, characterized in that, The separator is a continuous discharge centrifuge.

9. The protein-containing clear liquid treatment system according to claim 1, characterized in that, The protein separation vessel is a conical-bottom vessel.

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