CN114859995B - Automatic temperature control system for urea melting, slurry spraying and granulating production - Google Patents
Automatic temperature control system for urea melting, slurry spraying and granulating production Download PDFInfo
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- CN114859995B CN114859995B CN202210422441.5A CN202210422441A CN114859995B CN 114859995 B CN114859995 B CN 114859995B CN 202210422441 A CN202210422441 A CN 202210422441A CN 114859995 B CN114859995 B CN 114859995B
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- 238000002844 melting Methods 0.000 title claims abstract description 39
- 230000008018 melting Effects 0.000 title claims abstract description 39
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000004202 carbamide Substances 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005507 spraying Methods 0.000 title claims abstract description 14
- 239000002002 slurry Substances 0.000 title claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000005469 granulation Methods 0.000 claims abstract description 11
- 230000003179 granulation Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 abstract description 20
- 230000007547 defect Effects 0.000 abstract description 6
- 238000009529 body temperature measurement Methods 0.000 abstract description 4
- 230000003750 conditioning effect Effects 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 description 11
- 238000003199 nucleic acid amplification method Methods 0.000 description 11
- 239000007787 solid Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 210000002700 urine Anatomy 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007613 slurry method Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010128 melt processing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Control Of Temperature (AREA)
Abstract
The invention discloses an automatic temperature control system for urea melting, slurry spraying and granulation production, which comprises a melting tank and an electric control unit, wherein a temperature sensor is arranged in the melting tank, the electric control unit comprises a controller for adjusting the heating temperature of the melting tank, the electric control unit further comprises a temperature acquisition signal amplifying circuit, a feedback stable adjusting circuit and a filtering noise reduction circuit, the feedback stable adjusting circuit is used for sampling, feeding back and adjusting the output signal of a follow-up amplifying assembly, so that temperature drift imbalance is effectively avoided in the signal amplifying process, error voltage is eliminated, and the self-adaptive adjusting capacity of the system is improved; the invention adopts the infrared temperature measurement sensor to collect the heating temperature in the melting tank, and sends the temperature collection signal into the electric control unit for conditioning, thereby effectively solving the defects of high time lag and untimely temperature control feedback of the temperature sensor in the prior art, realizing accurate and effective temperature collection signal processing and high precision of the temperature control system and effectively improving the production quality of urea melting, spraying and granulating.
Description
Technical Field
The invention relates to the technical field of compound fertilizer production equipment, in particular to an automatic temperature control system for urea melt slurry spraying granulation production.
Background
At present, the domestic compound fertilizer is mainly produced by 3 processes of an extrusion method, a granule method and a slurry method. The current yield of the extrusion process is smaller; the slurry process is limited by factors such as production scale, investment scale and the like, and is mainly used in a small number of large enterprises; the granule method is adopted by most domestic manufacturers due to the characteristics of simple process, less investment, convenient operation and the like, and has the defects of more empirical factors in production, larger limitation of products on raw materials, and particularly difficult production of compound fertilizers with high nitrogen and urea content. The urea melting, slurry spraying and granulating production process principle is between the granule method and the slurry method, has the advantages of remarkably improving the yield, and has round and smooth product particles, high strength and difficult caking, for example, chinese patent CN 102731171B discloses a solid urea melting, slurry spraying and granulating system which can quickly melt solid urea entering a melter through steam to form urine without dissolving water and avoiding loss of available nutrients; in the solid urea melting treatment process, strict process indexes are provided, for example, the temperature of urine in a melting tank must meet the set temperature range of the system to ensure the smoothness of the surface of the guniting particles and prevent caking, however, the conventional temperature control system of the melter usually adopts a thermocouple as a temperature sensor to perform temperature acquisition, so that the defects of high time hysteresis and untimely temperature control feedback exist, meanwhile, temperature drift imbalance is easy to occur in the signal amplification treatment process, the generated common mode noise can be output by gain later, and becomes error voltage, so that the deviation exists between a temperature detection value and the actual temperature of urine in the melting tank, thereby seriously affecting the precision of the temperature control system and further affecting the production quality of molten guniting granulation.
The present invention provides a new solution to this problem.
Disclosure of Invention
Aiming at the situation, the invention aims to overcome the defects of the prior art and provide an automatic temperature control system for urea melting, slurry spraying and granulation production.
The technical scheme for solving the problems is as follows: the utility model provides an automatic temperature control system of urea melting guniting granulation production, includes melting tank and electrical control unit, is provided with temperature sensor in the melting tank, and electrical control unit is including being used for adjusting melting tank heating temperature's controller, electrical control unit still includes temperature acquisition signal amplification circuit, feedback stable regulation circuit and filtering noise reduction circuit, temperature acquisition signal amplification circuit includes operational amplifier AR1 and follows the amplifier module, operational amplifier AR 1's homophase input passes through RC filter and connects temperature sensor's signal output part, operational amplifier AR 1's inverting input part passes through resistance R2 and connects operational amplifier AR 1's output with follow the input of amplifying module, follow the output of amplifying module passes through the filtering noise reduction circuit connects the controller, feedback stable regulation circuit set up at operational amplifier AR1 homophase input with follow between the output of amplifying module.
Preferably, the following amplifying component comprises a triode T2 and a MOS tube Q1, a base electrode of the triode T2 is connected with an output end of the operational amplifier AR1, a collector electrode of the triode T2 is connected with a grid electrode of the MOS tube Q1 and one end of a resistor R3, the other end of the resistor R3 is connected with a +5V power supply, the other end of the resistor R3 is connected with a drain electrode of the MOS tube Q1 and one end of a capacitor C2, an emitter electrode of the triode T2 is connected with the other end of the capacitor C2 and is grounded through a resistor R5, and a source electrode of the MOS tube Q1 is grounded through a resistor R6.
Preferably, the feedback stability adjusting circuit includes a triode T1 disposed between the RC filter and the non-inverting input terminal of the op-amp AR1, where a collector of the triode T1 is connected to the output terminal of the RC filter, and is connected to a resistor R8 through a resistor RP1, one end of a capacitor C3 is connected to the inverting input terminal of the op-amp AR2, the resistor R8 is grounded to the other end of the capacitor C3, an emitter of the triode T1 is connected to the non-inverting input terminal of the op-amp AR1, a base of the triode T1 is connected to the output terminal of the op-amp AR2 and one end of the capacitor C4 through a resistor R9, and the non-inverting input terminal of the op-amp AR2 is connected to the other end of the capacitor C4 and is connected to the source of the MOS transistor Q1 through a resistor R7.
Preferably, the filtering noise reduction circuit includes resistors R10 and R11, an inductor L1 and a capacitor C6, wherein one end of the resistor R10 and one end of the inductor L1 are connected with the drain electrode of the MOS transistor Q1 through a capacitor C5, the other end of the inductor L1 is connected with the other end of the resistor R10 and one end of the resistor R11 through the capacitor C6, and the other end of the resistor R11 is grounded.
Preferably, the RC filter includes a resistor R1 and a capacitor C3, where one end of the resistor R1 is connected to the signal output end of the temperature sensor, and the other end of the resistor R1 is connected to the collector of the triode T1 and grounded through the capacitor C1.
Preferably, the temperature sensor is an infrared temperature sensor.
Through the technical scheme, the invention has the beneficial effects that:
1. the invention adopts the infrared temperature measurement sensor to collect the heating temperature in the melting tank, and sends the temperature collection signal into the electric control unit for conditioning, thereby effectively solving the defects of high time lag and untimely temperature control feedback of the temperature sensor in the prior art, ensuring accurate and effective temperature collection signal processing and high precision of the temperature control system and effectively improving the production quality of urea melting, spraying and granulating;
2. The feedback stable regulating circuit is adopted to sample and feedback regulate the output signal of the follow-up amplifying assembly, so that temperature drift imbalance generated in the signal amplifying process is effectively avoided, error voltage is eliminated, and the self-adaptive regulating capability of the system is improved;
3. And the filtering noise reduction circuit is used for carrying out notch processing on the output signals of the follow-up amplifying assembly, and the RLC notch principle is used for inhibiting power supply noise with specific frequency, so that the accuracy of temperature acquisition processing is further improved.
Drawings
Fig. 1 is a schematic circuit diagram of an electronic control unit according to the present invention.
Detailed Description
The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying fig. 1. The following embodiments are described in detail with reference to the drawings.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides an automatic temperature control system of urea melting guniting granulation production, includes melting tank and electrical control unit, is provided with temperature sensor in the melting tank, and electrical control unit is including being used for adjusting melting tank heating temperature's controller, and during the concrete setting, the melting tank adopts steam heating source to melt processing to solid urea, and temperature sensor selects infrared temperature sensor to gather the heating temperature in the melting tank, has the characteristics that sensitivity is high, the collection precision is high.
As shown in fig. 1, the electronic control unit further includes a temperature acquisition signal amplifying circuit, a feedback stabilizing and adjusting circuit and a filtering noise reduction circuit, the temperature acquisition signal amplifying circuit includes an operational amplifier AR1 and a following amplifying component, the in-phase input end of the operational amplifier AR1 is connected with the signal output end of the temperature sensor through an RC filter, the anti-phase input end of the operational amplifier AR1 is connected with the output end of the operational amplifier AR1 and the input end of the following amplifying component through a resistor R2, the output end of the following amplifying component is connected with the controller through the filtering noise reduction circuit, and the feedback stabilizing and adjusting circuit is arranged between the in-phase input end of the operational amplifier AR1 and the output end of the following amplifying component.
In the processing process of the temperature acquisition signal amplifying circuit, firstly, an operational amplifier AR1 is adopted to amplify the temperature acquisition signal of the infrared temperature measurement sensor, the intensity of the acquisition signal is rapidly improved by utilizing a voltage follower principle, and then the acquisition signal is sent into a follow-up amplifying assembly for further enhancement and adjustment; the specific structure of the follow-up amplifying assembly comprises a triode T2 and a MOS tube Q1, wherein a base electrode of the triode T2 is connected with an output end of an operational amplifier AR1, a collector electrode of the triode T2 is connected with a grid electrode of the MOS tube Q1 and one end of a resistor R3, the other end of the resistor R3 is connected with a +5V power supply, the triode T2 is connected with a drain electrode of the MOS tube Q1 and one end of a capacitor C2 through a resistor R4, an emitter electrode of the triode T2 is connected with the other end of the capacitor C2 and is grounded through a resistor R5, and a source electrode of the MOS tube Q1 is grounded through a resistor R6; the triode T2 and the MOS tube Q1 form a composite tube to follow and amplify the output signal of the operational amplifier AR1, so that the temperature acquisition signal enhancement efficiency is effectively improved, meanwhile, a resistance-capacitance filter network is added in the amplification process of the composite tube to filter and select frequencies of the temperature acquisition signal, external high-frequency clutter noise is effectively eliminated, and the temperature acquisition signal amplification precision is improved.
In order to avoid temperature drift imbalance in the signal amplification processing process, a feedback stable adjusting circuit is adopted to sample and feedback adjust the output signals of the follow-up amplifying assembly; the feedback stability adjusting circuit comprises a triode T1 arranged between the RC filter and the non-inverting input end of the operational amplifier AR1, wherein a collector electrode of the triode T1 is connected with the output end of the RC filter, and is connected with a resistor R8 through a rheostat RP1, one end of a capacitor C3 and the inverting input end of the operational amplifier AR2, the other end of the resistor R8 and the capacitor C3 are grounded, an emitter electrode of the triode T1 is connected with the non-inverting input end of the operational amplifier AR1, a base electrode of the triode T1 is connected with the output end of the operational amplifier AR2 and one end of the capacitor C4 through a resistor R9, and the non-inverting input end of the operational amplifier AR2 is connected with the other end of the capacitor C4 and is connected with a source electrode of the MOS transistor Q1 through a resistor R7; the resistors R6 and R7 sample the source output signal of the MOS transistor Q1 by utilizing a resistor shunt principle and send the source output signal to the operational amplifier AR2 for in-phase amplification, the capacitor C4 plays a role in signal compensation in the operational amplifier process, continuous and stable sampling amplification output is ensured, meanwhile, the capacitor C3 has a function of thermal noise elimination at the inverting input end of the operational amplifier AR2, and signal feedback precision is improved; triode T1 is used as the governing pipe and carries out regulation processing to temperature acquisition signal processing, adjusts triode T1's base signal through operational amplifier AR 2's output signal to carry out quick feedback compensation to the signal through triode T1 when the signal appears deregulating, utilize closed loop feedback principle to eliminate error voltage, promote the self-adaptation adjustment ability of system.
Further, the filtering noise reduction circuit is used for carrying out notch processing on the output signal of the follow-up amplifying assembly, the specific structure of the filtering noise reduction circuit comprises resistors R10 and R11, an inductor L1 and a capacitor C6, one end of the resistor R10 and one end of the inductor L1 are connected with the drain electrode of the MOS tube Q1 through the capacitor C5, the other end of the inductor L1 is connected with the other end of the resistor R10 and one end of the resistor R11 through the capacitor C6, and the other end of the resistor R11 is grounded; the capacitor C5 is used for coupling output signals of the follow-up amplifying assembly, then an RLC trap consisting of resistors R10 and R11, an inductor L1 and a capacitor C6 is used for carrying out trap processing on temperature acquisition signals, and power supply noise with specific frequency is restrained through the trap, so that the accuracy of the temperature acquisition processing is further improved.
Further, the RC filter comprises a resistor R1 and a capacitor C3, one end of the resistor R1 is connected with the signal output end of the temperature sensor, and the other end of the resistor R1 is connected with the collector of the triode T1 and is grounded through the capacitor C1; the influence of high-frequency interference generated by external environment light on the infrared temperature measurement sensor is primarily eliminated by utilizing the RC filter principle, and the noise gain output in the temperature acquisition signal amplifying circuit is reduced.
In the specific working process, an infrared temperature sensor is adopted to collect the heating temperature in the melting tank, and a temperature collection signal is sent into an electric control unit for conditioning; firstly, a temperature acquisition signal amplifying circuit carries out rapid amplification adjustment on acquisition signals, a resistance-capacitance filter network is added in the amplification process to carry out filtering frequency selection, so that external high-frequency clutter noise is effectively eliminated, and the amplification precision of the temperature acquisition signals is improved; the feedback stable regulating circuit is adopted to sample and feedback regulate the output signal of the follow-up amplifying assembly, so that temperature drift imbalance generated in the signal amplifying process is effectively avoided, error voltage is eliminated, and the self-adaptive regulating capability of the system is improved; then, a filtering noise reduction circuit is adopted to carry out notch processing on the output signal of the follow-up amplifying assembly, and the RLC notch principle is utilized to inhibit power supply noise with specific frequency, so that the accuracy of temperature acquisition processing is further improved; finally, the controller carries out operation processing on the processed temperature acquisition signals, and calculates the real-time temperature of the materials in the melting tank;
The controller controls and regulates the heating temperature of the melting tank according to the real-time detected temperature value, when the temperature is specifically set, the lower limit of the heating self-control of the melting tank is set to 115 ℃, the upper limit of the heating self-control of the melting tank is set to 125 ℃, the pressure of heating steam in the melting tank is 0.5-1.2Mpa, and when the detected temperature value exceeds the set range, the controller automatically carries out on/off regulation on a steam heating source valve of the melting tank, so that the melting temperature of solid urea is always in the set range of the system, and the spraying effect is improved; the invention effectively solves the defects of high time lag of the temperature sensor and untimely temperature control feedback in the prior art, and has accurate and effective temperature acquisition signal processing and high precision of a temperature control system, thereby effectively improving the production quality of urea melting, slurry spraying and granulation.
While the invention has been described in connection with certain embodiments, it is not intended that the invention be limited thereto; for those skilled in the art to which the present invention pertains and the related art, on the premise of based on the technical scheme of the present invention, the expansion, the operation method and the data replacement should all fall within the protection scope of the present invention.
Claims (4)
1. The utility model provides an automatic temperature control system of urea melting guniting granulation production, includes melting tank and electronic control unit, is provided with temperature sensor in the melting tank, and electronic control unit is including being used for adjusting melting tank heating temperature's controller, its characterized in that: the electronic control unit further comprises a temperature acquisition signal amplifying circuit, a feedback stability adjusting circuit and a filtering noise reduction circuit, wherein the temperature acquisition signal amplifying circuit comprises an operational amplifier AR1 and a following amplifying component, the non-inverting input end of the operational amplifier AR1 is connected with the signal output end of the temperature sensor through an RC filter, the inverting input end of the operational amplifier AR1 is connected with the output end of the operational amplifier AR1 and the input end of the following amplifying component through a resistor R2, the output end of the following amplifying component is connected with the controller through the filtering noise reduction circuit, and the feedback stability adjusting circuit is arranged between the non-inverting input end of the operational amplifier AR1 and the output end of the following amplifying component;
The following amplifying assembly comprises a triode T2 and a MOS tube Q1, wherein a base electrode of the triode T2 is connected with an output end of an operational amplifier AR1, a collector electrode of the triode T2 is connected with a grid electrode of the MOS tube Q1 and one end of a resistor R3, the other end of the resistor R3 is connected with a +5V power supply, the other end of the resistor R3 is connected with a drain electrode of the MOS tube Q1 and one end of a capacitor C2 through a resistor R4, an emitter electrode of the triode T2 is connected with the other end of the capacitor C2 and is grounded through a resistor R5, and a source electrode of the MOS tube Q1 is grounded through a resistor R6;
the feedback stability adjusting circuit comprises a triode T1 arranged between the RC filter and the in-phase input end of the operational amplifier AR1, wherein a collector electrode of the triode T1 is connected with the output end of the RC filter, the triode T1 is connected with a resistor R8 through a rheostat RP1, one end of a capacitor C3 is connected with the anti-phase input end of the operational amplifier AR2, the other end of the resistor R8 and the capacitor C3 is grounded, an emitter electrode of the triode T1 is connected with the in-phase input end of the operational amplifier AR1, a base electrode of the triode T1 is connected with the output end of the operational amplifier AR2 and one end of the capacitor C4 through a resistor R9, and the in-phase input end of the operational amplifier AR2 is connected with the other end of the capacitor C4 and is connected with a source electrode of the MOS transistor Q1 through a resistor R7.
2. The automatic temperature control system for urea melt slurry spraying granulation production according to claim 1, wherein: the filtering noise reduction circuit comprises resistors R10 and R11, an inductor L1 and a capacitor C6, wherein one end of the resistor R10 and one end of the inductor L1 are connected with the drain electrode of the MOS tube Q1 through the capacitor C5, the other end of the inductor L1 is connected with the other end of the resistor R10 and one end of the resistor R11 through the capacitor C6, and the other end of the resistor R11 is grounded.
3. The automatic temperature control system for urea melt slurry spraying granulation production according to claim 2, wherein: the RC filter comprises a resistor R1 and a capacitor C3, one end of the resistor R1 is connected with the signal output end of the temperature sensor, and the other end of the resistor R1 is connected with the collector of the triode T1 and is grounded through the capacitor C1.
4. An automatic temperature control system for urea melt slurry spraying granulation production according to any one of claims 1-3, characterized in that: the temperature sensor is an infrared temperature sensor.
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| WO2024104350A1 (en) * | 2022-11-17 | 2024-05-23 | 上海境业环保能源科技股份有限公司 | Prilling tail-gas dust ammonia water vapor integrated intelligent purification system, and urea prilling tower |
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|---|
| 基于ARM的智能温度控制系统;郭映;叶春生;;自动化技术与应用;20130225(第02期);全文 * |
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| CN114859995A (en) | 2022-08-05 |
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