Precise control system for pot head mash temperature after raw material crushing

Abstract

The invention discloses a system for accurately controlling the temperature of pot mash after raw material crushing, belongs to the technical field of beer production, and solves the technical problem that a traditional method for independently performing crushing according to a set temperature of a fixed process cannot ensure that a green area cannot be achieved by 100%. The system comprises a pulverizer, a saccharifying pot, a cold water inlet pipe, a hot water inlet pipe and a controller, the water inlet end of the pulverizer is connected with the cold water inlet pipe and the output end of the hot water inlet pipe through a size mixing water pipe, the cold water inlet pipe or the hot water inlet pipe is provided with a size mixing water temperature adjusting valve, the size mixing water pipe is provided with a size mixing water thermometer, and the saccharifying pot is provided with a saccharifying pot thermometer. And the controller is electrically connected with the size mixing water temperature regulating valve, the size mixing water thermometer and the saccharifying pot thermometer. In the control process, when the actual temperature of the saccharifying pot is higher than the process set temperature, the set temperature value of the size mixing water is reduced; if not, increasing the size mixing water temperature set value to dynamically change the size mixing water temperature set value; and outputting and controlling the size mixing water temperature regulating valve in real time by using a PID algorithm according to the size mixing water temperature set value.

Description

Technical Field

[0001] The present invention relates to the technical field of beer production, and more specifically, it relates to a precise control system for the temperature of the mash in the kettle after the raw materials are crushed. Background Art

[0002] Currently, when producing saccharified wort in beer production, first, the raw materials (rice, malt or malt alone) need to be wet-crushed. After the crushed liquid enters the kettle, it is necessary to ensure that the temperature at the end of the crushing in the gelatinization kettle after the rice is crushed, the temperature at the end of the crushing in the saccharification kettle after the malt is crushed, the deviation of the protein rest temperature, and the key PI control points in the green zone of the temperature deviation after mashing. The control range of the green zone is plus or minus 0.2 degrees required by the process. Exceeding the range belongs to the red-yellow zone, and too large a temperature difference is directly unqualified and affects the process execution. Thus, it can be seen the importance of precisely controlling the temperature of the mash in the kettle after the raw materials are crushed.

[0003] However, due to the influence of various factors such as weather, the first kettle at the start of production, and the temperature of the water tank, the traditional method of setting the temperature according to a fixed process alone during crushing cannot ensure that 100% of the temperature is within the green zone. Now, most of the time, the entire crushing process is completed by manual intervention of the operator. The operator will continuously manually modify the set value of the water temperature of the crusher according to the temperature of the kettle to manually control. In this process, the operator needs to consume a lot of energy, and at the same time, cannot pay attention to other key control points. Moreover, due to problems such as experience and energy, it cannot be guaranteed that 100% of the manual control of the operator will be effective, thus there is a hidden danger of the red-yellow zone, ultimately affecting the quality of the wort. Summary of the Invention

[0004] The technical problem to be solved by the present invention is in view of the above deficiencies of the prior art. The purpose of the present invention is to provide a precise control system for the temperature of the mash in the kettle after the raw materials are crushed.

[0005] The technical solution of the present invention is: a precise control system for the temperature of the mash in the kettle after the raw materials are crushed, including a crusher and a saccharification kettle. The crusher is connected to the saccharification kettle through a crushing pipe. It also includes a cold water inlet pipe, a hot water inlet pipe, and a controller. The water inlet end of the crusher is connected to a slurry mixing water pipe. One end of the slurry mixing water pipe is connected to the output ends of the cold water inlet pipe and the hot water inlet pipe. The cold water inlet pipe or the hot water inlet pipe is provided with a slurry mixing water temperature regulating valve. The slurry mixing water pipe is provided with a slurry mixing water thermometer. The saccharification kettle is provided with a saccharification kettle thermometer. The controller is electrically connected to the slurry mixing water temperature regulating valve, the slurry mixing water thermometer, and the saccharification kettle thermometer;

[0006] The control process is as follows:

[0007] Initially, set the set value of the slurry mixing water temperature equal to the process set temperature;

[0008] The controller receives the actual temperature feedback from the saccharification pot thermometer in real time and compares it with the process-set temperature in real time;

[0009] When the actual temperature is greater than the process-set temperature, the set value of the sizing water temperature is decreased; when the actual temperature is less than the process-set temperature, the set value of the sizing water temperature is increased;

[0010] The controller outputs and controls the sizing water temperature regulating valve in real time using the PID algorithm according to the set value of the sizing water temperature, so that the temperature value feedback by the sizing water thermometer is equal to the set value of the sizing water temperature. The set value of the sizing water temperature changes dynamically in a cyclic control manner throughout the process.

[0011] As a further improvement, the control parameters further include: algorithm activation flag, reference target set value, reference target deviation value, temperature adjustment interval duration, single temperature adjustment magnitude, adjustment range. The lower limit value and upper limit value of the set value of the sizing water temperature are determined according to the adjustment range;

[0012] The control process specifically includes:

[0013] Step 1. When the algorithm activation flag is triggered, the reference target set value is equal to the process-set temperature;

[0014] Step 2. Obtain the actual temperature feedback from the saccharification pot thermometer in real time. The actual deviation is equal to the actual temperature minus the process-set temperature;

[0015] Step 3. When the actual deviation is greater than the reference target deviation value, the set value of the sizing water temperature is equal to the reference target set value minus the single temperature adjustment magnitude; when the actual deviation is less than the reference target deviation value, the set value of the sizing water temperature is equal to the reference target set value plus the single temperature adjustment magnitude;

[0016] Step 4. When the set value of the sizing water temperature is less than the lower limit value, make the set value of the sizing water temperature equal to the lower limit value; when the set value of the sizing water temperature is greater than the upper limit value, make the set value of the sizing water temperature equal to the upper limit value;

[0017] Step 5. Within the temperature adjustment interval duration, keep the set value of the sizing water temperature unchanged and output and control the sizing water temperature regulating valve using the PID algorithm;

[0018] Step 6. Make the reference target set value equal to the set value of the sizing water temperature;

[0019] Step 7. Execute Step 2 until all raw material crushing is completed.

[0020] Further, the reference target deviation value is 0.2 degrees, the single temperature adjustment magnitude is 0.2 - 0.4 degrees, and the adjustment range is ±4.5 - 5.5 degrees.

[0021] Furthermore, the single - time temperature adjustment magnitude is 0.3 degrees, and the adjustment range is ±5 degrees.

[0022] Furthermore, during the crushing step, when the liquid level of the saccharification pot submerges the thermometer of the saccharification pot, it is used as the algorithm activation flag, and the temperature adjustment interval duration is 18 - 22 seconds.

[0023] Furthermore, the temperature adjustment interval duration is 20 seconds.

[0024] Furthermore, during the flushing step after the crushing is completed, when the step delay time is 28 - 32 seconds, it is used as the algorithm activation flag, and the temperature adjustment interval duration is 28 - 32 seconds.

[0025] Furthermore, during the flushing step after the crushing is completed, when the step delay time is 30 seconds, it is used as the algorithm activation flag, and the temperature adjustment interval duration is 30 seconds.

[0026] Furthermore, the controller is a PLC module, a single - chip microcomputer or an industrial control computer, and the detection signals output by the sizing water thermometer and the saccharification pot thermometer are both analog signals; the height between the installation position of the saccharification pot thermometer and the bottom of the saccharification pot is not less than 0.5 meters.

[0027] Furthermore, a mixing pipe is provided at the front end of the sizing water pipe. The front end of the mixing pipe is connected to the hot water inlet pipe. An annular pipe spray head is provided at the front end inside the mixing pipe. The annular pipe spray head is connected to the cold water inlet pipe through a connecting pipe. Spray holes are provided on the side of the annular pipe spray head. The maximum diameter of the annular pipe spray head is smaller than the inner diameter of the mixing pipe. The annular pipe spray head is located at the mid - line inside the mixing pipe. A central rod is fixedly provided at the rear end inside the mixing pipe through a connecting rod. A spiral blade is provided on the outer wall of the central rod. Connecting flanges are respectively provided at both ends of the mixing pipe.

[0028] Beneficial Effects

[0029] Compared with the prior art, the advantages of the present invention are as follows:

[0030] By comparing the actual temperature with the process - set temperature in real - time, dynamically changing the sizing water temperature set value according to the deviation, and using the PID algorithm to output and control the sizing water temperature regulating valve in real - time according to the sizing water temperature set value, the present invention ensures that the PI - point indicators such as the temperature at the end of crushing in the saccharification pot and the deviation of the protein rest temperature are in the 100% green zone. Brief Description of the Drawings

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2Schematic diagram of the structure of the mixing tube in the present invention;

[0033] Figure 3 is Figure 2 Schematic diagram of the structure in the A-A direction in

[0034] Wherein: 1 - crusher, 2 - saccharification pot, 3 - crushing pipe, 4 - cold water inlet pipe, 5 - hot water inlet pipe, 6 - sizing water pipe, 7 - sizing water temperature regulating valve, 8 - sizing water thermometer, 9 - saccharification pot thermometer, 10 - mixing tube, 11 - annular tube spray head, 12 - connecting rod, 13 - central rod, 14 - spiral blade, 15 - connecting flange, 16 - controller, 17 - connecting pipe, 18 - spray hole. Specific embodiments

[0035] The present invention will be further described below with reference to specific embodiments in the accompanying drawings.

[0036] Refer to Figures 1 to 3 , a precise control system for the temperature of the mash in the pot head after raw materials are crushed, including a crusher 1 and a saccharification pot 2. The crusher 1 is connected to the saccharification pot 2 through a crushing pipe 3. The control system further includes a cold water inlet pipe 4, a hot water inlet pipe 5, and a controller 16. The water inlet end of the crusher 1 is connected with a sizing water pipe 6. One end of the sizing water pipe 6 is connected to the output ends of the cold water inlet pipe 4 and the hot water inlet pipe 5. The cold water inlet pipe 4 or the hot water inlet pipe 5 is provided with a sizing water temperature regulating valve 7. The sizing water pipe 6 is provided with a sizing water thermometer 8. The saccharification pot 2 is provided with a saccharification pot thermometer 9. The controller 16 is electrically connected to the sizing water temperature regulating valve 7, the sizing water thermometer 8, and the saccharification pot thermometer 9.

[0037] The control process is as follows:

[0038] Initially, set the sizing water temperature set value equal to the process set temperature;

[0039] The controller 16 receives the actual temperature feedback by the saccharification pot thermometer 9 in real time and compares it with the process set temperature in real time;

[0040] When the actual temperature is greater than the process set temperature, reduce the sizing water temperature set value; when the actual temperature is less than the process set temperature, increase the sizing water temperature set value;

[0041] The controller 16 uses the PID algorithm to output and control the sizing water temperature regulating valve 7 in real time according to the sizing water temperature set value, so that the temperature value feedback by the sizing water thermometer 8 is equal to the sizing water temperature set value. The sizing water temperature set value changes dynamically and circulates in the whole process.

[0042] Furthermore, the control parameters further include: algorithm activation flag, reference target set value, reference target deviation value, temperature adjustment interval duration, single - time temperature adjustment magnitude, adjustment range, and determine the lower limit value and upper limit value of the sizing water temperature set value according to the adjustment range.

[0043] The control process specifically includes:

[0044] Step 1. When the algorithm activation flag is triggered, the reference target set value is equal to the process set temperature;

[0045] Step 2. Obtain the actual temperature feedback by the saccharification pot thermometer 9 in real time, and the actual deviation is equal to the actual temperature minus the process set temperature;

[0046] Step 3. When the actual deviation is greater than the reference target deviation value, the sizing water temperature set value is equal to the reference target set value minus the single - time temperature adjustment magnitude; when the actual deviation is less than the reference target deviation value, the sizing water temperature set value is equal to the reference target set value plus the single - time temperature adjustment magnitude;

[0047] Step 4. When the sizing water temperature set value is less than the lower limit value, make the sizing water temperature set value equal to the lower limit value; when the sizing water temperature set value is greater than the upper limit value, make the sizing water temperature set value equal to the upper limit value;

[0048] Step 5. Within the temperature adjustment interval duration, keep the sizing water temperature set value unchanged and perform PID algorithm output to control the sizing water temperature regulating valve 7;

[0049] Step 6. Make the reference target set value equal to the sizing water temperature set value;

[0050] Step 7. Execute Step 2 until all raw material crushing is completed.

[0051] That is, through the above steps, the sizing water temperature set value is dynamically and cyclically changed, and the sizing water temperature regulating valve 7 is PID - controlled according to the sizing water temperature set value. The sizing water temperature set value is no longer the fixed process set temperature.

[0052] Specifically, the reference target deviation value is 0.2 degrees, the single - time temperature adjustment magnitude is 0.2 - 0.4 degrees, and the adjustment range is ±4.5 - 5.5 degrees. Preferably, the single - time temperature adjustment magnitude is 0.3 degrees, and the adjustment range is ±5 degrees.

[0053] When in the crushing step, use the liquid level of the saccharification pot 2 covering the saccharification pot thermometer 9 as the algorithm activation flag, and the temperature adjustment interval duration is 18 - 22 seconds. Preferably, the temperature adjustment interval duration is 20 seconds.

[0054] When in the flushing step after crushing is completed, use the step delay time of 28 - 32 seconds as the algorithm activation flag, and the temperature adjustment interval duration is 28 - 32 seconds. Preferably, use the step delay time of 30 seconds as the algorithm activation flag, and the temperature adjustment interval duration is 30 seconds.

[0055] For example, the process set temperature is 52 degrees.

[0056] Set the reference target set value to 52 degrees, the reference target deviation value to 0.2 degrees (i.e., when the deviation between the actual temperature of the saccharification pot 2 and the process set temperature is less than or equal to 0.2 degrees, it enters the control dead zone (no control)), the temperature adjustment interval duration to 20 seconds, the single - time temperature adjustment size to 0.3 degrees, and the adjustment range to ±5 degrees. The set value of the slurry - adjusting water temperature is set to 52 degrees, the upper limit value of the set value of the slurry - adjusting water temperature is 52 + 5 = 57 degrees, and the lower limit value of the set value of the slurry - adjusting water temperature is 52 - 5 = 47 degrees.

[0057] When in the crushing step, assuming that the algorithm activation flag is triggered, the actual temperature feedback by the saccharification pot thermometer 9 is 52.5 degrees. 52.5 degrees minus the process set temperature of 52 degrees equals 0.5 degrees, which is greater than the reference target deviation value of 0.2 degrees. It is determined that the actual temperature deviation of the saccharification pot 2 is too large. The controller 16 controls the set value of the slurry - adjusting water temperature to decrease by 0.3 every 20 seconds. That is, the set value of the slurry - adjusting water temperature within the first 20 seconds is 52 - 0.3 = 51.7 degrees. During this period, the controller uses the PID algorithm to output and control the slurry - adjusting water temperature regulating valve 7 in real - time, so that the temperature value feedback by the slurry - adjusting water thermometer 8 is equal to or infinitely close to 51.7 degrees. And so on, when the set value of the slurry - adjusting water temperature is less than or equal to 47 degrees, the lower - limit protection is triggered, and the minimum set value of the output slurry - adjusting water temperature is always 47 degrees.

[0058] Conversely, the program control logic of the controller is opposite. That is, when the actual temperature feedback by the saccharification pot thermometer 9 is too low compared with the process set temperature, the controller 16 controls the set value of the slurry - adjusting water temperature to increase by 0.3 every 20 seconds. When the set value of the slurry - adjusting water temperature is greater than or equal to 57 degrees, the upper - limit protection is triggered, and the maximum set value of the output slurry - adjusting water temperature is always 57 degrees. Through the above - mentioned control method, the actual temperature of the saccharification pot 2 during the crushing process is equal to or infinitely close to 52 degrees.

[0059] When in the rinsing step after the crushing is completed, use the step delay time of 30 seconds as the algorithm activation flag. Other parameters remain unchanged, only the temperature adjustment interval duration becomes 30S, so that the delay during the rinsing step intervenes slowly to avoid excessive fluctuations. Thus, it ensures that the PI - point indicators such as the temperature at the end of the crushing of the saccharification pot after malt crushing and the deviation of the protein rest temperature are in the 100% green zone.

[0060] In this embodiment, the controller 16 is a PLC module or a single - chip microcomputer or an industrial control computer. The detection signals output by the slurry - adjusting water thermometer 8 and the saccharification pot thermometer 9 are both analog signals, that is, the detection signals output by the slurry - adjusting water thermometer 8 and the saccharification pot thermometer 9 are both analog signals of (4 - 20mA). The height between the installation position of the saccharification pot thermometer 9 and the bottom of the saccharification pot 2 is not less than 0.5 meters.

[0061] As a further improvement, a mixing pipe 10 is provided at the front end of the sizing water pipe 6. The front end of the mixing pipe 10 is connected to the hot water supply pipe 5. An annular pipe nozzle 11 is provided at the front end inside the mixing pipe 10. The annular pipe nozzle 11 is connected to the cold water supply pipe 4 through a connecting pipe 17. Spray holes 18 are provided on the side surface of the annular pipe nozzle 11. The maximum diameter of the annular pipe nozzle 11 is smaller than the inner diameter of the mixing pipe 10. The annular pipe nozzle 11 is located at the midline inside the mixing pipe 10. A central rod 13 is fixedly provided at the rear end inside the mixing pipe 10 through a connecting rod 12. A spiral blade 14 is provided on the outer wall of the central rod 13. Connecting flanges 15 are respectively provided at both ends of the mixing pipe 10. After the hot water and the cold water enter the mixing pipe 10, the temperature of each point in the water flow is consistent, thus ensuring the accuracy of the detection by the sizing water thermometer 8.

[0062] The above is only the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A precise control system for the temperature of the pot head mash after raw materials are crushed, comprising a crusher (1) and a saccharification pot (2), wherein the crusher (1) is connected to the saccharification pot (2) through a crushing pipe (3), and is characterized in that, It also includes a cold water supply pipe (4), a hot water supply pipe (5), and a controller (16). The water inlet end of the pulverizer (1) is connected with a slurry preparation water pipe (6). One end of the slurry preparation water pipe (6) is connected to the output ends of the cold water supply pipe (4) and the hot water supply pipe (5). A slurry preparation water temperature regulating valve (7) is provided on either the cold water supply pipe (4) or the hot water supply pipe (5). A slurry preparation water thermometer (8) is provided on the slurry preparation water pipe (6). A saccharification pot thermometer (9) is provided on the saccharification pot (2). The controller (16) is electrically connected to the slurry preparation water temperature regulating valve (7), the slurry preparation water thermometer (8), and the saccharification pot thermometer (9); The control process is as follows: Initially, set the slurry preparation water temperature set value equal to the process set temperature; The controller (16) receives the actual temperature fed back by the saccharification pot thermometer (9) in real time and compares it with the process set temperature in real time; When the actual temperature is greater than the process set temperature, decrease the slurry preparation water temperature set value; when the actual temperature is less than the process set temperature, increase the slurry preparation water temperature set value; The controller (16) outputs a control signal to the slurry preparation water temperature regulating valve (7) in real time using the PID algorithm according to the slurry preparation water temperature set value, so that the temperature value fed back by the slurry preparation water thermometer (8) is equal to the slurry preparation water temperature set value. The slurry preparation water temperature set value dynamically changes and circulates for control throughout the process.

2. The precise control system for the temperature of the pot head mash after crushing the raw materials according to claim 1, characterized in that, The control parameters also include: algorithm activation flag, reference target set value, reference target deviation value, temperature adjustment interval duration, single - time temperature adjustment magnitude, adjustment range. Determine the lower limit value and upper limit value of the slurry preparation water temperature set value according to the adjustment range; The control process specifically includes: Step 1. When the algorithm activation flag is triggered, the reference target set value is equal to the process set temperature; Step 2. Obtain the actual temperature fed back by the saccharification pot thermometer (9) in real time. The actual deviation is equal to the actual temperature minus the process set temperature; Step 3. When the actual deviation is greater than the reference target deviation value, the slurry preparation water temperature set value is equal to the reference target set value minus the single - time temperature adjustment magnitude; when the actual deviation is less than the reference target deviation value, the slurry preparation water temperature set value is equal to the reference target set value plus the single - time temperature adjustment magnitude; Step 4. When the slurry preparation water temperature set value is less than the lower limit value, make the slurry preparation water temperature set value equal to the lower limit value; when the slurry preparation water temperature set value is greater than the upper limit value, make the slurry preparation water temperature set value equal to the upper limit value; Step 5. Within the temperature adjustment interval duration, keep the slurry preparation water temperature set value unchanged and perform PID algorithm output to control the slurry preparation water temperature regulating valve (7); Step 6. Make the reference target set value equal to the slurry preparation water temperature set value; Step 7. Execute Step 2 until all raw materials are completely pulverized.

3. The precise control system for the temperature of the pot head mash after the raw materials are crushed according to claim 2, wherein, The reference target deviation value is 0.2 degrees, the single - time temperature adjustment magnitude is 0.2 - 0.4 degrees, and the adjustment range is ±4.5 - 5.5 degrees.

4. A precise control system for the temperature of the pot head mash after the raw materials are crushed, as described in claim 3, wherein The single - time temperature adjustment magnitude is 0.3 degrees, and the adjustment range is ±5 degrees.

5. The precise control system for the temperature of the pot head mash after the raw materials are crushed according to claim 2, wherein, When in the crushing step, the activation flag of the algorithm is that the liquid level of the saccharification pot (2) covers the saccharification pot thermometer (9), and the temperature adjustment interval is 18 to 22 seconds.

6. The precise control system for the temperature of the pot head mash after the raw materials are crushed according to claim 5, wherein, The temperature adjustment interval is 20 seconds.

7. The precise control system for the temperature of the pot head mash after the raw materials are crushed according to claim 2, characterized in that, When in the rinsing step after crushing, the activation flag of the algorithm is the step delay time of 28 to 32 seconds, and the temperature adjustment interval is 28 to 32 seconds.

8. A precise control system for the temperature of the pot head mash after the raw materials are crushed, as described in claim 7, characterized in that, When in the rinsing step after crushing, the activation flag of the algorithm is the step delay time of 30 seconds, and the temperature adjustment interval is 30 seconds.

9. A precise control system for the temperature of pot head mash after raw materials are crushed according to claim 1, characterized in that, The controller (16) is a PLC module, a single-chip microcomputer or an industrial control computer. The detection signals output by the sizing water thermometer (8) and the saccharification pot thermometer (9) are both analog signals; the height between the installation position of the saccharification pot thermometer (9) and the bottom of the saccharification pot (2) is not less than 0.5 meters.

10. The precise control system for the temperature of the pot head mash after crushing the raw materials according to claim 1, characterized in that, The front end of the sizing water pipe (6) is provided with a mixing pipe (10). The front end of the mixing pipe (10) is connected to the hot water inlet pipe (5). An annular pipe spray head (11) is provided at the front end inside the mixing pipe (10). The annular pipe spray head (11) is connected to the cold water inlet pipe (4) through a connecting pipe (17). Spray holes (18) are provided on the side of the annular pipe spray head (11). The maximum diameter of the annular pipe spray head (11) is smaller than the inner diameter of the mixing pipe (10). The annular pipe spray head (11) is located at the midline inside the mixing pipe (10). A central rod (13) is fixedly provided at the rear end inside the mixing pipe (10) through a connecting rod (12). A spiral blade (14) is provided on the outer wall of the central rod (13). Connecting flanges (15) are respectively provided at both ends of the mixing pipe (10).

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