CN217093242U - Automatic continuous batching system of citric acid liquefaction raw materials - Google Patents
Automatic continuous batching system of citric acid liquefaction raw materials Download PDFInfo
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- CN217093242U CN217093242U CN202220241776.2U CN202220241776U CN217093242U CN 217093242 U CN217093242 U CN 217093242U CN 202220241776 U CN202220241776 U CN 202220241776U CN 217093242 U CN217093242 U CN 217093242U
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Abstract
The utility model discloses an automatic continuous batching system of citric acid liquefaction raw materials. The batching system comprises a water adding system, a feeding system, an enzyme adding system, a cascade circulating system and a control system. The utility model discloses an automatic batching system in succession of citric acid liquefaction raw materials based on industrialization automatic control, batching system can realize the automatic batching in succession of citric acid raw materials, carry out concentration detection and automatic control system through feed liquid concentration monitor and combine, utilize cascade circulation control mode to the accurate control of parameters such as the water-powder ratio of batching jar ejection of compact thick liquid, enzyme-powder ratio, pH, temperature, thick liquid concentration, realized the industrialization of citric acid liquefaction raw materials, full-automatic, in succession, even batching, for the liquefaction of maize meal, saccharification, and the stability of follow-up fermentation has laid the basis.
Description
Technical Field
The utility model belongs to the technical field of citric acid preparation processing, in particular to automatic continuous feed proportioning system of citric acid acidizing raw materials.
Background
The corn flour contains rich carbon sources, nitrogen sources and trace elements, is a good raw material for producing citric acid by industrial fermentation, and needs to be liquefied and saccharified by starch when being used for citric acid fermentation. Liquefaction refers to a process of gelatinizing corn flour by using liquefying enzyme under a certain condition, hydrolyzing starch into micromolecular dextrin and oligosaccharide, wherein the molecular weight of the starch is smaller and smaller, the viscosity of reaction liquid is continuously reduced, and the fluidity is continuously enhanced.
The factors influencing the liquefaction of the corn flour mainly comprise: water-to-flour ratio (ratio of corn flour to water), enzyme-to-flour ratio (ratio of corn flour to liquefying enzyme), PH, temperature, etc. of corn flour slurry, and wherein the change in the moisture content of the corn flour has an effect on the water-to-flour ratio. Therefore, the uniform blending of the raw material corn flour liquefied liquid in the industrial production of citric acid is a precondition for full liquefaction and saccharification of corn flour and also a key link for preparing the citric acid raw material.
At present, in the industrial production of citric acid, due to the lack of proper detection means and control methods, the automatic, continuous and uniform batching of raw material liquid cannot be realized in the batching process of the raw material liquid. In a common batching mode, manual batching is performed manually, an operator controls the water amount of a batching tank according to experience at first, then the whole corn flour amount is added into the batching tank to be stirred, meanwhile, amylase is added, and the PH and the temperature are manually adjusted, so that the efficiency is low, the component fluctuation of raw material liquid is easily caused, the subsequent liquefaction and saccharification are insufficient, and the citric acid fermentation is influenced; the concentration of the raw material liquid can not be accurately controlled and timely and actually adjusted.
Disclosure of Invention
To the not enough of prior art, the utility model provides an automatic batching system in succession of citric acid liquefaction raw materials. The utility model discloses an automatic batching system in succession of citric acid liquefaction raw materials based on industrialization automatic control, batching system can realize the automatic batching in succession of citric acid raw materials, carry out concentration detection and automatic control system through the microwave soft measuring and combine, utilize cascade circulation control mode to the accurate control of water-powder ratio, enzyme-powder ratio, pH, temperature, thick liquid concentration isoparametric of batching jar ejection of compact thick liquid, realized the industrialization of citric acid liquefaction raw materials, full-automatic, in succession, even batching, for the liquefaction of maize meal, saccharification, and the stability of follow-up fermentation has laid the basis.
The technical scheme of the utility model as follows:
an automatic continuous batching system for a citric acid liquefied raw material comprises a water adding system, a feeding system, an enzyme adding system, a cascade circulating system and a control system; the water adding system comprises a dilute acid input pipeline, a hot water input pipeline, a water distribution tank 1 and a water inlet pipeline; a dilute acid control valve 3 is arranged on the dilute acid input pipeline; a hot water control valve 4 is arranged on the hot water input pipeline; a water inlet pump 5, a water inlet control valve 6 and a flowmeter 7 are sequentially arranged on the water inlet pipeline; the dilute acid input pipeline and the hot water input pipeline are both communicated with the top of the water distribution tank 1; the charging system comprises a quantitative packing auger 8, a weighing packing auger 9 and a batching tank 2; a water inlet pipeline of the water adding system is communicated with the top of the batching tank 2; the enzyme adding system comprises an enzyme adding pump 10 and a weight loss scale 11; the enzyme adding system is communicated with the top of the dosing tank 2 through a pipeline; the cascade circulation system comprises a circulation pipeline, a feed liquid concentration detector 13 and a pH detector II 14; and the circulating pipeline is sequentially provided with a discharge pump 12, a circulating regulating valve 15 and a discharge valve 16.
Further, a stirrer I17 is arranged on the water distribution tank 1.
Further, a stirrer II 18 and a liquid level meter II 22 are arranged on the dosing tank 2.
Furthermore, a pH detector I19, a liquid level meter I20 and a thermometer 21 are also arranged on the water distribution tank 1.
Further, cascade circulation system still includes batching jar 2, and batching jar 2's bottom loops through discharge pump 12, feed liquid concentration detector 13, pH detector II 14 and circulation control valve 15 and flows back the feed liquid to batching jar 2.
Further, the dilute acid control valve 3, the hot water control valve 4, the water inlet pump 5, the water inlet control valve 6, the flowmeter 7, the quantitative packing auger 8, the weighing packing auger 9, the enzyme adding pump 10, the weight reduction scale 11, the material outlet pump 12, the material liquid concentration detector 13, the pH detector II 14, the circulation regulating valve 15, the material outlet valve 16, the pH detector I19, the liquid level meter I20, the thermometer 21 and the liquid level meter II 22 are all connected with the control system through leads.
Further, the feed liquid concentration detector 13 is a microwave concentration measuring instrument or a mass flow meter.
Further, feed liquid in batching jar 2 passes through discharge pump 12, through feed liquid concentration detector 13 and pH detector II 14, and the feed liquid that reaches the requirement flows out through bleeder valve 16, and the feed liquid that does not reach the requirement flows back to batching jar 2 through circulation control valve 15.
The beneficial technical effects of the invention are as follows:
(1) the utility model discloses a design water system, charging system, add the enzyme system, cascade circulation system and control system, set up microwave concentration measuring apparatu in cascade circulation system on the accurate measuring basis of maize flour thick liquid concentration, utilize the cascade circulation control system who designs to the aqueous humor ratio of batching jar ejection of compact thick liquid, enzyme powder ratio, pH, temperature, the accurate control of serous concentration isoparametric, the industrialization of citric acid raw materials liquefaction liquid has been realized, full-automatic, in succession, evenly the batching, for the liquefaction of maize flour, saccharification, and the stability of follow-up fermentation has laid the basis.
(2) Utilize the utility model discloses a batching system can conveniently seek the optimization experiment: the optimal parameter set of the batch tank discharging slurry can be found out conveniently by changing any one of the parameters of water-powder ratio, enzyme-powder ratio, pH, temperature, slurry concentration and the like of the batch tank discharging slurry and comparing the optimal DE value after saccharification of the corn flour, and the efficiency of the system is improved.
(3) The utility model is provided with a weak acid inlet pipeline and a hot water inlet pipeline, and realizes the adjustment of the pH value through the control of different catheter input quantities; the used feed water is secondary gas condensate water and hot water generated in the citric acid production process, the pH value and the temperature are adjusted by respectively controlling the amounts of the condensate water and the hot water, acid, alkali and heat are not required to be consumed additionally, and the comprehensive utilization of water resources and heat is realized.
(4) The batching system of the utility model is controlled by a PLC or DCS system and can be associated with the front and back working sections, for example, the corn flour amount put into the batching tank can be matched with the slurry amount required by fermentation; the change of the corn flour amount put into the mixing tank can directly influence the corn flour crushing amount and the like, and the control in a wider range is realized.
Drawings
Fig. 1 is a schematic view of the batching system of the present invention.
In the figure: 1. a water distribution tank; 2. a dosing tank; 3. a weak acid control valve; 4. a hot water control valve; 5. a water inlet pump; 6. a water inlet control valve; 7. a flow meter; 8. a quantitative auger; 9. weighing the auger; 10. adding an enzyme pump; 11. a weight loss scale; 12. a discharge pump; 13. a feed liquid concentration detector; 14. a pH detector II; 15. a circulation regulating valve; 16. a discharge valve; 17. a stirrer I; 18. a stirrer II; 19. a pH detector I; 20. a liquid level meter I; 21. a thermometer; 22. and a liquid level meter II.
Fig. 2 is a schematic view of the automatic continuous batching control system of the utility model.
Fig. 3 is a schematic view of the microwave measurement in the present invention.
In the figure: 1. a microwave sensing transmitting end; 2. a thermal resistance temperature detector; 3. a microwave sensing receiving end; 4. and a microwave data processing unit.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example 1
An automatic continuous batching system for a citric acid liquefied raw material is shown in figure 1, and comprises a water adding system, a feeding system, an enzyme adding system, a cascade circulating system and a control system; the water adding system comprises a dilute acid input pipeline, a hot water input pipeline, a water distribution tank 1 and a water inlet pipeline; a dilute acid control valve 3 is arranged on the dilute acid input pipeline; a hot water control valve 4 is arranged on the hot water input pipeline; a water inlet pump 5, a water inlet control valve 6 and a flowmeter 7 are sequentially arranged on the water inlet pipeline; the dilute acid input pipeline and the hot water input pipeline are both communicated with the top of the water distribution tank 1; the charging system comprises a quantitative packing auger 8, a weighing packing auger 9 and a batching tank 2; the water delivery pipeline of the water adding system is communicated with the top of the batching tank 2; the enzyme adding system comprises an enzyme adding pump 10 and a weight loss scale 11; the enzyme adding system is communicated with the top of the dosing tank 2 through a pipeline; the cascade circulation system comprises a circulation pipeline, a feed liquid concentration detector 13 and a pH detector II 14; and the circulating pipeline is sequentially provided with a discharge pump 12, a circulating regulating valve 15 and a discharge valve 16.
And a stirrer I17 is arranged on the water distribution tank 1.
And the dosing tank 2 is provided with a stirrer II 18 and a liquid level meter II 22.
The water distribution tank 1 is also provided with a pH detector I19, a liquid level meter I20 and a thermometer 21.
Cascade circulation system still includes batching jar 2, and batching jar 2's bottom loops through discharge pump 12, feed liquid concentration detector 13, pH detector II 14 and circulation control valve 15 and flows back the feed liquid to batching jar 2.
The fresh acid control valve 3, the hot water control valve 4, the water inlet pump 5, the water inlet control valve 6, the flowmeter 7, the quantitative auger 8, the weighing auger 9, the enzyme adding pump 10, the weight reduction scale 11, the discharge pump 12, the feed liquid concentration detector 13, the pH detector II 14, the circulation regulating valve 15, the discharge valve 16, the pH detector I19, the liquid level meter I20, the thermometer 21 and the liquid level meter II 22 are all connected with the control system through leads.
The feed liquid concentration detector 13 is a microwave concentration measuring instrument.
Feed liquid in batching jar 2 passes through discharge pump 12, through feed liquid concentration detector 13 and pH detector II 14, reaches the feed liquid of requirement and passes through bleeder valve 16 outflow, and the feed liquid that does not reach the requirement flows back to batching jar 2 through circulation regulating valve 15.
The quantitative auger 8 can regulate the flow of the corn flour by frequency conversion according to a set value; the weighing auger 9 is used for detecting the flow of the corn flour, and an enzyme adding system is used for automatically feeding the required amylase according to the set enzyme-flour ratio and the actual flour feeding amount; the control system can realize the functions of relevant sequence control, closed-loop control, interlocking protection and the like.
The working process of the batching system comprises the following steps:
(1) the fresh acid control valve 3 and the hot water control valve 4 are opened, the pH is controlled to be 4.5-4.8, the temperature is controlled to be 72-78 ℃, the liquid level of the water distribution tank 1 is controlled to be 1m, the stirrer I17 is started, and finally the liquid level of the water distribution tank 1 is controlled to be 2.0 +/-0.5 m.
(2) Starting the water inlet pump 5, and feeding water into the proportioning tank 2 for 1m 3 And opening a blending tank stirrer II 18, and respectively opening a quantitative packing auger 8 and a weighing packing auger 9 to start feeding powder into the blending tank 2.
(3) The water and powder feeding ratio is automatic, and the frequency conversion of the water inlet pump 5 is controlled, so that the ratio of the feed water flow to the corn powder flow is (3.4-3.6): 1.
(4) and (3) the enzyme-powder feeding ratio is automatic, the flow of the corn flour entering the mixing tank 2 determined in the step (2) is multiplied by the water-powder ratio to be used as an amylase flow given value, the flow of the amylase is accurately measured by adopting a weight loss scale 11, a variable-frequency metering pump (enzyme adding pump 11) is started for adjustment, the enzyme-powder ratio is enabled to be about (0.06-0.08) kg/T, and the enzyme is added into the mixing tank 2.
(5) When the liquid level of the material 2 in the proportioning tank reaches 1.5m, the circulation regulating valve 15 of the cascade circulation system is opened, the discharge pump 12 is opened, circulation is performed, the microwave water concentration measuring instrument at the outlet of the discharge pump 12 is utilized to measure the slurry concentration, after the slurry concentration is stable, the discharge valve 16 is opened, the circulation regulating valve 15 of the proportioning tank is closed, and continuous discharging is started; the liquid level of the batching tank is automatically fed, and the liquid level of the batching tank is controlled to be 2.5-3 m through a circulating regulating valve 15 of the batching tank.
The utility model discloses used weak acid and hot water are produced secondary condensate and hot water in the citric acid production process.
The schematic diagram of the microwave concentration measuring instrument is shown in fig. 3, and the microwave concentration measuring instrument comprises a microwave sensing transmitting end 1; a thermal resistance temperature detector 2; a microwave sensing receiving end 3; a microwave data processing unit 4; when the microwave concentration measuring instrument is used, the microwave concentration measuring instrument is installed at an outlet pipe of the batching pump by adopting plug-in measurement, and the microwave data processing unit 4 is a core component of the microwave concentration measuring instrument, is a control center of a microwave signal source and is also an analysis and operation processing center of a microwave signal.
Example 2
An automatic continuous batching system for a citric acid liquefied raw material is shown in figure 1, and comprises a water adding system, a feeding system, an enzyme adding system, a cascade circulating system and a control system; the water adding system comprises a dilute acid input pipeline, a hot water input pipeline, a water distribution tank 1 and a water inlet pipeline; a dilute acid control valve 3 is arranged on the dilute acid input pipeline; a hot water control valve 4 is arranged on the hot water input pipeline; a water inlet pump 5, a water inlet control valve 6 and a flowmeter 7 are sequentially arranged on the water inlet pipeline; the dilute acid input pipeline and the hot water input pipeline are both communicated with the top of the water distribution tank 1; the charging system comprises a quantitative packing auger 8, a weighing packing auger 9 and a batching tank 2; the water delivery pipeline of the water adding system is communicated with the top of the batching tank 2; the enzyme adding system comprises an enzyme adding pump 10 and a weight loss scale 11; the enzyme adding system is communicated with the top of the dosing tank 2 through a pipeline; the cascade circulation system comprises a circulation pipeline, a feed liquid concentration detector 13 and a pH detector II 14; and the circulating pipeline is sequentially provided with a discharge pump 12, a circulating regulating valve 15 and a discharge valve 16.
And a stirrer I17 is arranged on the water distribution tank 1.
And the dosing tank 2 is provided with a stirrer II 18 and a liquid level meter II 22.
The water distribution tank 1 is also provided with a pH detector I19, a liquid level meter I20 and a thermometer 21.
Cascade circulation system still includes batching jar 2, and batching jar 2's bottom loops through discharge pump 12, feed liquid concentration detector 13, pH detector II 14 and circulation control valve 15 and flows back the feed liquid to batching jar 2.
The fresh acid control valve 3, the hot water control valve 4, the water inlet pump 5, the water inlet control valve 6, the flowmeter 7, the quantitative auger 8, the weighing auger 9, the enzyme adding pump 10, the weight reduction scale 11, the discharge pump 12, the feed liquid concentration detector 13, the pH detector II 14, the circulation regulating valve 15, the discharge valve 16, the pH detector I19, the liquid level meter I20, the thermometer 21 and the liquid level meter II 22 are all connected with the control system through leads.
The material liquid concentration detector 13 is a mass flow meter, and a corresponding concentration value can be obtained through the value of the mass flow meter according to a conversion table of concentration and mass.
Feed liquid in batching jar 2 passes through discharge pump 12, through feed liquid concentration detector 13 and pH detector II 14, and the feed liquid that reaches the requirement flows out through bleeder valve 16, and the feed liquid that does not reach the requirement flows back to batching jar 2 through circulation control valve 15.
The quantitative auger 8 can regulate the flow of the corn flour by frequency conversion according to a set value; the weighing auger 9 is used for detecting the flow of the corn flour, and an enzyme adding system is used for automatically feeding the required amylase according to the set enzyme-flour ratio and the actual flour feeding amount; the control system can realize the functions of relevant sequence control, closed-loop control, linkage protection and the like.
The working process of the batching system comprises the following steps:
(1) and (3) opening the weak acid control valve 3 and the hot water control valve 4, controlling the pH value to be 4.5-4.8, the temperature to be 72-78 ℃, controlling the liquid level of the water distribution tank 1 to be 1m by adjusting the two valves, starting the stirrer I17, and finally controlling the liquid level of the water distribution tank 1 to be 2.0 +/-0.5 m.
(2) Starting the water inlet pump 5, and feeding water into the proportioning tank 2 for 1m 3 And opening a blending tank stirrer II 18, and respectively opening a quantitative packing auger 8 and a weighing packing auger 9 to start feeding powder into the blending tank 2.
(3) The water and powder feeding ratio is automatic, and the frequency conversion of the water inlet pump 5 is controlled, so that the ratio of the feed water flow to the corn powder flow is (3.4-3.6): 1.
(4) and (3) the enzyme-powder feeding ratio is automatic, the flow of the corn flour entering the mixing tank 2 determined in the step (2) is multiplied by the water-powder ratio to be used as an amylase flow given value, the flow of the amylase is accurately measured by adopting a weight loss scale 11, a variable-frequency metering pump (enzyme adding pump 11) is started for adjustment, the enzyme-powder ratio is enabled to be about (0.06-0.08) kg/T, and the enzyme is added into the mixing tank 2.
(5) When the liquid level of the material 2 in the batching tank reaches 1.5m, a circulation regulating valve 15 of a cascade circulation system is opened, a discharging pump 12 is opened, circulation is performed, and a material liquid concentration measuring device 13 at the outlet of the discharging pump 12 is utilized, wherein the measuring device is a mass flowmeter; measuring the concentration of the slurry, opening a discharge valve 16 after the concentration of the slurry is stable, closing a circulating regulating valve 15 of the batching tank, and starting continuous discharging; the liquid level of the batching tank is automatically fed, and the liquid level of the batching tank is controlled to be 2.5-3 m through a circulating regulating valve 15 of the batching tank.
The utility model discloses used weak acid and hot water are produced secondary condensate and hot water in the citric acid production process.
The utility model discloses an effect test:
samples were taken at different feed rates, the density of the slurry was measured by a densitometer and compared with the value measured in example 2 directly at the discharge line using a mass flow meter, the feed liquid concentration and the total sugar concentration of the liquefied and saccharified sugar solution were calculated, and the relationship between the feed liquid concentration and density of the corn slurry and the total sugar concentration of the final sugar solution was examined, and the results are shown in table 1.
TABLE 1
As can be seen from Table 1, the concentration of the feed liquid has a very good linear relationship with the density and the total sugar concentration detected by the densimeter, and the density detected by the mass flow meter is consistent with the measurement result of the experimental practical densimeter.
This application has still compared the precision that adopts microwave measurement technique and quality densimeter to survey feed liquid concentration. Experiments show that the standard deviation range measured by using a microwave measuring instrument is 0.01-0.04; the relative standard deviation range is 0.02-0.06%, which shows that the measurement precision is higher.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (7)
1. An automatic continuous batching system for a citric acid liquefied raw material is characterized by comprising a water adding system, a feeding system, an enzyme adding system, a cascade circulating system and a control system; the water adding system comprises a dilute acid input pipeline, a hot water input pipeline, a water distribution tank (1) and a water inlet pipeline; a dilute acid control valve (3) is arranged on the dilute acid input pipeline; a hot water control valve (4) is arranged on the hot water input pipeline; a water inlet pump (5), a water inlet control valve (6) and a flowmeter (7) are sequentially arranged on the water inlet pipeline; the dilute acid input pipeline and the hot water input pipeline are both communicated with the top of the water distribution tank (1); the charging system comprises a quantitative packing auger (8), a weighing packing auger (9) and a batching tank (2); a water inlet pipeline of the water adding system is communicated with the top of the batching tank (2); the enzyme adding system comprises an enzyme adding pump (10) and a weight loss scale (11); the enzyme adding system is communicated with the top of the batching tank (2) through a pipeline; the cascade circulation system comprises a circulation pipeline, a feed liquid concentration detector (13) and a pH detector II (14); the circulating pipeline is sequentially provided with a discharge pump (12), a circulating regulating valve (15) and a discharge valve (16).
2. The automatic continuous blending system for liquefied raw materials of citric acid according to claim 1, wherein the blending tank (1) is provided with a stirrer I (17).
3. The automatic continuous blending system of citric acid liquefied raw material according to claim 1, wherein said blending tank (2) is provided with a stirrer II (18) and a liquid level meter II (22).
4. The automatic continuous blending system for liquefied raw materials of citric acid according to claim 1, wherein the blending tank (1) is provided with a pH detector I (19), a liquid level meter I (20) and a thermometer (21).
5. The automatic continuous blending system of claim 1, characterized in that the bottom of the blending tank (2) returns the feed liquid to the blending tank (2) through a discharge pump (12), a feed liquid concentration detector (13), a pH detector II (14) and a circulation regulating valve (15) in sequence.
6. The automatic continuous batching system for liquefied raw materials of citric acid according to claim 1, wherein the dilute acid control valve (3), the hot water control valve (4), the water inlet pump (5), the water inlet control valve (6), the flow meter (7), the quantitative packing auger (8), the weighing packing auger (9), the enzyme adding pump (10), the weight loss scale (11), the discharge pump (12), the feed liquid concentration detector (13), the pH detector II (14), the circulation regulating valve (15), the discharge valve (16), the pH detector I (19), the liquid level meter I (20), the thermometer (21) and the liquid level meter II (22) are all connected with the control system through leads.
7. The automatic continuous blending system of citric acid liquefaction raw material according to claim 1, characterized in that the feed liquid concentration detector (13) is a microwave concentration measuring instrument or a mass flow meter.
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