A method and device for controlling a carbonization apparatus using a programmable logic controller

Abstract

The present application relates to carbonization equipment technical field, especially to a kind of PLC program control method and device of carbonization equipment;The method comprises: obtaining target gas concentration and total pressure of gas in mixing tank;According to the target gas concentration obtained, output adjustment signal to each pneumatic valve, and air and industrial carbon dioxide are input into mixing tank;Heating in mixing tank makes gas mixing uniform;Mixed gas in mixing tank is input into reaction tank;According to adjustment signal, pneumatic valve on reaction tank is regulated.This application can adjust different concentration of gas according to demand, meet carbonation reaction demand;The control method can be completed by PLC control system, and the concentration of gas of mixing and carbonation reaction is adjusted and gas pressure is adjusted, the reaction condition of carbonation reaction in reaction tank is maintained, the effect of carbon sequestration is improved, the whole system can be intelligently regulated and controlled by signal adjustment of PLC control system, time and effort are saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbonization equipment, in particular to a PLC program control method and device of carbonization equipment. BACKGROUND

[0002] With the clear proposal of "carbon peak" in 2030 and "carbon neutralization" in 2060 in September 2020, a large number of related researches and applications in the direction of carbon reduction and carbon fixation have emerged in China. Carbon reduction mainly takes measures to reduce carbon emissions from carbon sources, and carbon fixation is to reduce the emission of carbon dioxide by absorbing it through materials. Research has found that some materials can stably fix carbon dioxide and can prepare carbonized products with good performance after absorbing carbon dioxide, which can be popularized to the market.

[0003] At present, a lot of further research is needed from research to practical application of carbon fixation products. In the early research, it is known that the main factors affecting the carbonization effect are the concentration of carbon dioxide and the pressure of gas in the carbonization process. In practical application, the carbon dioxide gas used for carbonization mainly comes from tail gas emitted by various industrial productions. Due to different industries, the concentration of carbon dioxide in the tail gas is different. At the same time, carbonization reaction is a typical gas-solid reaction that gradually penetrates from the surface to the inside. The carbonizable minerals contact with carbon dioxide to generate carbonized substances to make the surface dense, affecting the penetration of carbon dioxide. Increasing the gas pressure can improve the penetration effect of the gas and improve the carbon fixation effect. The current carbonization equipment generally directly introduces high-purity carbon dioxide gas into the equipment, which cannot control the gas concentration. A few can control the gas concentration, but cannot guarantee the uniformity of the mixed gas. The non-uniformity of the gas will obviously affect the carbonization effect. During the carbonization process, the carbonizable minerals absorb carbon dioxide, resulting in a continuous decrease in the gas concentration. In practical application, the concentration needs to be guaranteed within a certain range and cannot be too high or too low. If the concentration is too high, the carbonization reaction will be too fast, and a large amount of heat will be accumulated in the equipment, which will affect the gas penetration due to the early reaction. If the concentration is too low, the reaction will be too slow, and the efficiency will be too low. Therefore, there is an urgent need for a PLC program control method and device of carbonization equipment to dynamically control the gas concentration in the reaction container and improve the efficiency of the carbonization reaction. SUMMARY

[0004] To solve the above problems, on the one hand, the present application provides a PLC program control method of carbonization equipment, comprising the following steps:

[0005] 1) obtaining a target gas concentration x and a total gas pressure P in a gas mixing tank h , vacuumizing the gas mixing tank;

[0006] 2) According to the obtained target gas concentration, output adjustment signals to each pneumatic valve, open and close the pneumatic valves on the gas distribution pipeline according to the adjustment signals, and sequentially introduce industrial carbon dioxide with a carbon dioxide concentration of N and air into the mixing tank until the measured air pressure in the mixing tank reaches the set total gas pressure P of the mixing tank. h Stop gas intake;

[0007] 3) Heat the inside of the mixing tank to make the gas mix evenly until the difference between the detected value y and the target gas concentration x is less than the tolerance.

[0008] 4) Set the parameters of the reaction tank, the required gas concentration for the reaction is C0, the required gas pressure value is P0, and the required reaction time is t. Evacuate the reaction tank, and regulate the pneumatic valve on the reaction tank according to the adjustment signal to input the evenly mixed gas in the mixing tank into the reaction tank until the set pressure value and / or gas concentration required for the reaction are reached.

[0009] 5) Regulate the pneumatic valve on the reaction tank according to the adjustment signal to ensure that during the carbonization reaction, the measured pressure value and / or gas concentration in the reaction tank approaches the set pressure value and / or gas concentration.

[0010] Further, in step 3), during the gas mixing process in the mixing tank, the difference between at least two gas concentration detection results is less than 1% vol.

[0011] Further, in step 3), when the difference between the detected value y and the target gas concentration x in the mixing tank is greater than the tolerance, industrial carbon dioxide gas or air is supplemented into the mixing tank.

[0012] Further, in the mixing tank, if y > x, air is supplemented until the air pressure reaches y*P h / x; if y < x, industrial carbon dioxide is supplemented until the air pressure reaches (N - y)*P h / (N - x).

[0013] Further, in step 5), when the measured pressure value in the reaction tank is greater than the set pressure value, the exhaust end of the reaction tank is opened through the adjustment signal until the measured pressure value is equal to the set pressure value; when the measured pressure value in the reaction tank is less than the set pressure value, the intake end of the reaction tank is opened through the adjustment signal until the measured pressure value is equal to the set pressure value.

[0014] Further, in step 5), when the detected gas concentration in the reaction tank is less than the set gas concentration, the intake end and the exhaust end of the reaction tank are opened through the adjustment signal until the detected gas concentration is equal to the set gas concentration.

[0015] In another aspect, the present application also provides a PLC program control device of a carbonization equipment using the control method as described above, comprising a PLC control system, a reaction tank and at least one gas mixing tank, the gas outlet end of the gas mixing tank is connected with the gas inlet end of the reaction tank, a vacuum pump is connected to the gas mixing tank, a heating assembly is arranged in the gas mixing tank, the gas inlet end of the gas mixing tank is connected with a gas inlet pipeline, the gas mixing tank and the reaction tank are both provided with a gas pressure detector and a gas concentration detector, and the gas pressure detector and the gas concentration detector are signal connected with the PLC control system.

[0016] Further, the gas inlet pipeline of the gas mixing tank is provided with a first pneumatic valve and a second pneumatic valve for air and carbon dioxide gas adjustment, a fourth pneumatic valve is arranged between the gas mixing tank and the reaction tank, the gas outlet end of the reaction tank is provided with a sixth pneumatic valve, and the first pneumatic valve, the second pneumatic valve, the fourth pneumatic valve and the sixth pneumatic valve are signal connected with the PLC control system.

[0017] Further, the reaction tank is further connected with a temperature sensor, and the temperature sensor is connected with the PLC control system.

[0018] The present application has the following beneficial effects compared with the prior art due to the adoption of the above technical scheme:

[0019] The PLC program control method and device of the carbonization equipment provided by the present application can fully mix and uniformly mix the gas in the gas mixing tank, maintain the uniformity of the mixed gas, adjust the gas of different concentrations according to the requirements, meet the carbonization reaction requirements, complete the gas mixing and carbonization reaction concentration adjustment through the PLC control system, maintain the reaction conditions of the carbonization reaction in the reaction tank, improve the carbon sequestration effect, and make the whole system intelligent and controllable through the signal adjustment of the PLC control system, thereby saving time and effort. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the PLC program control method of the carbonization equipment of the present application;

[0021] Figure 2 It is a schematic diagram of the PLC program control method of the carbonization equipment of the present application;

[0022] Figure 3 It is a schematic diagram of the PLC program control device of the carbonization equipment of the present application.

[0023] 1-gas mixing tank; 2-reaction tank; 3-first pneumatic valve; 4-second pneumatic valve; 5-fourth pneumatic valve; 6-sixth pneumatic valve; 7-vacuum pump; 8-heating assembly; 9-gas pressure detector; 10-gas concentration detector; 11-temperature sensor; 12-third pneumatic valve; 13-fifth pneumatic valve. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application. In the drawings, the size and relative size of a part may be exaggerated for clarity.

[0025] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected to" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements, and the specific meaning of the above terms in the present application can be understood according to the specific circumstances by a person of ordinary skill in the art.

[0026] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the present application.

[0027] Embodiment 1

[0028] The present application provides a PLC program control method of carbonization equipment, as shown in the accompanying drawings Figure 1 and 2 , which is a flowchart, comprising the following steps:

[0029] 1) obtaining a target gas concentration x and a total gas pressure P in the gas mixing tank h , the gas mixing tank is vacuumized;

[0030] 2) according to the obtained target gas concentration, outputting an adjusting signal to each pneumatic valve, opening and closing the pneumatic valve on the gas distribution pipeline according to the adjusting signal, and sequentially introducing industrial carbon dioxide with a carbon dioxide concentration of N and air into the gas mixing tank until the gas pressure measurement value in the gas mixing tank is the set total gas pressure P of the gas mixing tank h , stop the air inlet;

[0031] 3) heating the gas mixing tank to make the gas mixture uniform until the difference between the detection value y and the target gas concentration x is less than the tolerance;

[0032] 4) setting the parameters of the reaction tank, the required gas concentration for the reaction is C0, the required gas pressure value is P0, the required reaction time is t, the reaction tank is vacuumed, the pneumatic valve on the reaction tank is controlled according to the adjustment signal, the mixed gas tank is input into the reaction tank, until the required set pressure value and / or gas concentration for the reaction is reached;

[0033] 5) the pneumatic valve on the reaction tank is controlled according to the adjustment signal, and the measured pressure value and / or gas concentration in the reaction tank during the carbonization reaction is close to the set pressure value and / or gas concentration.

[0034] Specifically, the reaction tank is provided with a material for carbon sequestration, which can absorb and sequest carbon dioxide, reduce carbon dioxide emissions, and input carbon dioxide gas with a certain concentration and pressure into the reaction tank to ensure the normal progress of the carbonization reaction in the reaction tank. In order to study the carbonization reaction under different gas concentrations, the gas is mixed in the gas mixing tank before being input into the reaction tank, so as to obtain mixed gas with a set concentration and make the mixed gas fully mixed and uniform in the gas mixing tank.

[0035] In this embodiment, carbon dioxide gas with a set concentration is prepared in the gas mixing tank, mainly by mixing air and industrial carbon dioxide gas, wherein the carbon dioxide concentration in the industrial carbon dioxide is ≥20%, the target gas concentration is x, the measured gas concentration in the gas mixing tank is y, the carbon dioxide concentration in the industrial carbon dioxide is N, and the total pressure of the gas in the gas mixing tank is P h According to the adjustment signal, the pneumatic valve on the gas distribution pipeline is opened and closed, and air and industrial carbon dioxide are input into the gas mixing tank to obtain mixed gas. Before the gas is input, the sealed cavity of the gas mixing tank is vacuumed.

[0036] Specifically, the second pneumatic valve 4 of the industrial carbon dioxide is first opened, and the industrial carbon dioxide gas is input into the sealed cavity of the gas mixing tank 1 until the gas pressure detected by the gas mixing tank is closed at the preset value, which is the partial pressure of carbon dioxide calculated according to the target gas concentration, and the preset value is x*P h / N. After the carbon dioxide is input, the first pneumatic valve 3 of the air is opened, and the air is input into the sealed cavity of the gas mixing tank 1 until the gas pressure detected by the gas mixing tank is P h

[0037] ​After the air intake in the gas mixing tank is stopped, the carbon dioxide will obviously settle in the air due to its large density, resulting in uneven mixing of carbon dioxide and air, which affects the carbonation reaction effect. Therefore, heating is needed to make the gas mix uniformly. The heating pipe arranged in the gas mixing tank is used to heat the sealing cavity of the gas mixing tank to accelerate the mixing of the gas. During the mixing process, the gas concentration in the gas mixing tank is detected multiple times. When the difference between the two gas concentration detection results is less than 1%vol, it is considered that the gas in the gas mixing tank is uniformly mixed. Otherwise, the heating time can be prolonged to improve the uniformity of the gas mixing, and the gas concentration in the gas mixing tank is continuously detected.

[0038] In the optimization implementation, when the difference between the gas concentration detection value y in the gas mixing tank and the target gas concentration value x is less than the tolerance, the target gas concentration adjustment is completed, and the uniformly mixed gas in the gas mixing tank can be introduced into the reaction tank for carbonation reaction.

[0039] As one of the implementation manners, when the difference between the detection value y in the gas mixing tank and the target gas concentration x is greater than the tolerance, industrial carbon dioxide gas or air is supplemented into the gas mixing tank to the target gas concentration. If y>x, the first pneumatic valve is opened, and air is supplemented until the gas pressure is y*P h / x; if y<x, the second pneumatic valve is opened, and industrial carbon dioxide is supplemented until the gas pressure is (N-y)*P h / (N-x). After the gas is supplemented, the gas needs to be heated and mixed again. The above mixing and detection operations are repeated until the mixing is uniform.

[0040] As one of the implementation manners, the gas pressure has a great influence on the reaction degree in the carbonation reaction. The present application can be used to explore the carbonation under different pressures. Specifically, the pressure value P0 required for the reaction in the reaction tank and the reaction time t are set. The gas inlet pneumatic valve of the reaction tank is opened through the adjustment signal, and the uniformly mixed gas is injected into the reaction tank until the set pressure P0 is reached. Because the carbonation material absorbs carbon dioxide and releases a large amount of heat, causing the pressure in the reaction tank to fluctuate. When the difference between the detected pressure value and the set pressure value is greater than the pressure fluctuation ΔP, the gas pressure in the reaction tank is adjusted. When the detected pressure value P1>P0, the exhaust end of the reaction tank is opened through the adjustment signal until the detected pressure value is equal to the set pressure value. When the detected pressure value P1<P0, the gas inlet of the reaction tank is supplemented through the adjustment signal until the detected pressure value is equal to the set pressure value. After the reaction time t is reached, the equipment is automatically stopped. During the entire reaction process, the gas pressure and temperature in the reaction tank are detected and recorded at regular intervals. The detected pressure data is fed back to the system, and the opening and closing of the starting valves of the gas inlet and exhaust end of the reaction tank are controlled through the adjustment signal.

[0041] In a specific embodiment, the main carbonization product is a thin sheet type board, which is prepared from carbonizable material and fibers. After the board is formed, the water content of the board is controlled by a drying process. Then each board is placed on a carbonization rack in a reaction tank. The board can be cut into different sizes (e.g., 2440 mm*1220 mm*8 mm) according to requirements. Carbon dioxide gas is introduced into the reaction tank. The carbon dioxide gas immediately reacts with the carbonizable material to generate carbonization products, and a large amount of heat and water vapor is generated. The temperature in the reaction tank rises rapidly, and reaches a peak value in about 0-1 h. If the temperature in the reaction tank rises too quickly, the carbonization on the surface of the board will be too fast, the surface will become dense quickly, and the further penetration of the carbon dioxide gas will be hindered, which reduces the overall carbon sequestration rate and the content of the carbonization product, and affects the overall density of the board, thereby affecting the mechanical properties of the board. At the same time, due to the rapid evaporation of water in the board, and the large size of the board, the board is prone to bending deformation. Therefore, during the reaction process, the temperature change during the carbonization reaction process needs to be controlled to slow down the carbonization reaction rate.

[0042] In a detailed implementation, different pressure values required for the reaction can be set according to requirements to explore the carbonization under different pressures, and the recorded data can be used to guide industrial production. The carbonization reaction process generates heat, and a cooling water pipe can be arranged in the reaction tank to adjust the temperature of the reaction tank, so as to avoid the generation of a large amount of heat and water vapor in the material in the reaction tank in a short time, avoid the deformation of the board caused by the rapid change of temperature or the rapid loss of water, and also ensure the safety of the reaction tank and improve the reliability of the equipment. At the same time, a heating device can also be arranged in the reaction tank to adjust the temperature in the reaction tank in the early and late stages of carbonization.

[0043] The temperature change in the reaction tank is controlled to control the carbonation reaction rate. The main factors affecting the carbonation reaction rate are three, namely the carbon dioxide gas concentration, the reaction gas pressure and the reaction temperature. Generally, the higher the carbon dioxide concentration, the faster the initial carbonation reaction rate, and the less the influence after the surface is dense; the greater the reaction gas pressure, the higher the gas permeability, and the higher the carbon fixation rate; the higher the reaction temperature, the faster the gas molecular movement, the gas permeability is promoted, and the carbon fixation rate is improved. However, the carbonation reaction is a surface-to-depth reaction. If the early reaction is too fast, the surface is too dense, and the gas permeability is hindered, and if the temperature change is too fast and the water is lost too fast, the product will be deformed, so the early reaction rate needs to be controlled in a suitable range, and after the surface is dense, the gas permeability can be improved by increasing the gas pressure and the reaction temperature to improve the carbon fixation rate of the product. When the reaction gas concentration is too low, a long time is needed for carbonation, which can be promoted by pressurization or temperature increase. The gas pressure and the temperature have corresponding suitable values, and are not the larger the better. When the gas pressure is increased to a certain extent, the carbon fixation rate is improved little, but the equipment requirement is higher. When the temperature is too high, the solubility and the diffusion rate of CO2 decrease, and the carbon dioxide may escape from the material.

[0044] As one of the embodiments, the gas concentration in the carbonation reaction has a significant influence on the reaction degree, and the present embodiment can be used to explore the influence of the gas concentration on the carbonation.

[0045] Specifically, a single concentration gas can be filled in the reaction process for carbonation reaction, the required gas concentration for the reaction is set as C0, an appropriate concentration of industrial carbon dioxide is selected, the gas concentration x=C0 in the gas mixing tank is configured according to the experimental needs, after the gas in the gas mixing tank is uniformly mixed, the experiment starts, the pneumatic valve at the gas inlet end of the reaction tank is opened to fill the mixed gas into the reaction tank to the set gas concentration C0. Since the carbonation reaction consumes CO2, the gas concentration decreases, when the concentration decreases to C0-ΔC (ΔC is the set concentration decrease value), that is, the gas concentration decreases to the set lower limit threshold, the gas inlet end and the gas outlet end of the reaction tank are opened by adjusting the signal to send the gas in the gas mixing tank into the reaction tank at the same gas flow rate, and at the same time, the low-concentration gas in the reaction tank is discharged, when the gas concentration reaches C0, the pressure value in the reaction tank is P0, and the gas exchange is stopped. In the reaction process, the above operation is repeated to maintain the smooth progress of the carbonation reaction, and when the reaction time t is reached, the experiment is stopped.

[0046] The drawings enclosed with the specification Figure 2 The PLC program control flow chart of the carbonation equipment of the present embodiment is shown in the figure, wherein, Figure 2The first pneumatic valve 1 represents a first pneumatic valve for regulating air inlet of the air pipeline of the gas mixing tank, the second pneumatic valve 2 represents a second pneumatic valve for regulating carbon dioxide inlet of the carbon dioxide pipeline of the gas mixing tank, the third pneumatic valve 3 represents a third pneumatic valve for the pipeline of the gas concentration detector of the gas mixing tank, the fourth pneumatic valve 4 represents a fourth pneumatic valve for regulating the pipeline between the gas mixing tank and the reaction tank, the fifth pneumatic valve 5 represents a fifth pneumatic valve for the pipeline of the gas concentration detector of the reaction tank, and the sixth pneumatic valve 6 represents a sixth pneumatic valve for regulating the outlet of the reaction tank.

[0047] Different carbonizable materials have different optimal carbonization conditions, so a suitable device and method are needed to explore suitable carbonization conditions. By designing an orthogonal experiment table, suitable carbonization conditions can be obtained after the experiment. The design factor table is as follows:

[0048] Number Carbon dioxide concentration % vol Gas pressure (MPa) Reaction temperature (°C) 1 40 Normal pressure 40 2 40 0.12 60 3 40 0.22 50 4 60 Normal pressure 60 5 60 0.12 50 6 60 0.22 40 7 80 Normal pressure 50 8 80 0.12 40 9 80 0.22 60

[0049] The above is the test parameter setting of one of the carbonizable materials in the embodiment, which can explore the influence of carbon dioxide concentration, gas pressure and reaction temperature on the carbonization reaction. Of course, it is not limited to the above three factors. Other factors that affect the carbonization reaction can also be tested and studied through the device and control method. By effectively comparing the test results (such as the mechanical properties of the plate, the carbon sequestration rate, etc.), the optimal test conditions, i.e. the most suitable carbonization system of carbon dioxide concentration, gas pressure and reaction temperature, etc. can be found out to guide industrial production and provide data support for industrial production.

[0050] The program control method of the carbonization device of the present application can control the gas concentration, gas pressure and reaction temperature required for the reaction. Since the reaction is continuously carried out, the carbon dioxide gas concentration continuously decreases. The gas concentration required for the reaction is set. When the actual detected gas concentration in the reaction tank is lower than the set gas concentration threshold, the gas is supplemented to the reaction tank to reach the set value. Gas consumption, gas supplement or temperature rise will cause the gas pressure in the reaction tank to change. The gas pressure in the tank is controlled by supplementing, exhausting or cooling. The reaction tank is provided with heating and cooling functions, which can control the temperature during the reaction. When the temperature is lower than the set value, the temperature will be increased by heating. When the reaction in the reaction tank causes the temperature to rise, the temperature in the reaction tank will be reduced to the set value by cooling measures. The three factors will interact with each other. The above is the simultaneous control of the three factors for exploring the suitable carbonization system.

[0051] In actual production, single-factor control or multi-factor control can be performed, and the number of control factors can be reduced due to production conditions and cost control. Therefore, the device can be configured to perform single-factor control, the reaction tank does not control the reaction temperature, and only controls the gas concentration and the gas pressure. If the gas concentration is controlled, when the gas concentration is reduced to a certain value, the gas concentration can be restored to the set value by discharging and re-feeding gas. The reaction pressure and the reaction temperature are not controlled, and only records are made. If the gas pressure is controlled, when the gas pressure is reduced or increased, the pressure can be restored to the set value by feeding or discharging gas. The reaction gas concentration and the reaction temperature are not controlled, and only records are made. The device can also be configured to perform double-factor control, and the concentration and the temperature, the concentration and the pressure, and the pressure and the temperature are controlled at the same time. The other factor is only recorded. In the single-factor or multi-factor control described above, the control can be performed by a PLC program, and the operation is simple and practical.

[0052] Further, the embodiment can be used to perform carbonization experiments by filling different concentrations of gas during the reaction process, and to explore the influence of step gas concentration on the carbonization reaction. The reaction tank is connected to two or more gas mixing tanks, the gas concentrations in the gas mixing tanks are different, and the gas in the different gas mixing tanks is filled into the reaction tank in stages according to the set carbonization system to perform carbonization experiments. The adjustment mode when the gas concentration is reduced during each stage of the reaction process is the same as the adjustment process described above.

[0053] During the carbonization reaction process, the gas can be obtained by fully mixing and uniformly distributing the gas in the gas mixing tank, and the gas with the required concentration can be introduced into the reaction tank for carbonization reaction. During the reaction process, the gas state in the reaction tank can be adjusted according to the real-time detected pressure value or gas concentration value. The above process can be completed under the control of a PLC control system, so that the carbonization reaction control is more intelligent.

[0054] After the reaction time t is reached, the reaction is stopped, and the carbonization rate of the material = (the absolute dry mass after carbonization - the absolute dry mass before carbonization) / the absolute dry mass before carbonization * 100. The carbonization rate of the material can be calculated by the formula, and the influence of different pressures and different gas concentrations on the carbonization condition can be explored.

[0055] Embodiment 2

[0056] As shown in the accompanying drawings Figure 3As shown, the application also provides a PLC program control device of a carbonization equipment, which comprises a PLC control system, a reaction tank 2 and at least one gas mixing tank 1, the PLC control system is connected with the reaction tank 2 and the gas mixing tank 1 to control the operation of the whole system, a first pneumatic valve 3 and a second pneumatic valve 4 for adjusting air and carbon dioxide gas are arranged on the gas inlet pipeline of the gas mixing tank 1, the gas outlet end of the gas mixing tank 1 is connected with the gas inlet end of the reaction tank 2, a fourth pneumatic valve 5 is arranged on the pipeline between the gas mixing tank and the reaction tank, a sixth pneumatic valve 6 is arranged on the gas outlet pipeline of the reaction tank 2, a vacuum pump 7 is connected with the gas mixing tank 1 to vacuumize the sealed cavity of the gas mixing tank 1 before the gas enters the gas mixing tank 1, a heating assembly 8 is arranged in the gas mixing tank 1, a gas pressure detector 9 and a gas concentration detector 10 are arranged on the gas mixing tank 1 and the reaction tank 2, the gas pressure detector 9 and the gas concentration detector 10 are signal connected with the PLC control system, the first pneumatic valve 3, the second pneumatic valve 4, the third pneumatic valve 5 and the fourth pneumatic valve 6 are signal connected with the PLC control system, the pressure and the gas concentration in the gas mixing tank 1 and the reaction tank 2 can be monitored in real time, and the data is fed back to the PLC control system, and then the PLC control system controls the pneumatic valves through the adjusting signal.

[0057] In an optimal implementation, the reaction tank 2 is also connected with a temperature sensor 11, and the temperature sensor 11 is connected with the PLC control system.

[0058] In an optimal implementation, a third pneumatic valve 12 is arranged on the pipeline of the gas concentration detector 10 on the gas mixing tank, and a fifth pneumatic valve 13 is arranged on the pipeline of the gas concentration detector 10 on the reaction tank.

[0059] The working principle of the device is that the gas mixing tank is filled with air and industrial carbon dioxide through the first pneumatic valve and the second pneumatic valve of the gas inlet pipeline, and the gas is uniformly mixed in the gas mixing tank, the fourth pneumatic valve is opened to fill the gas into the reaction tank, and the third pneumatic valve and the fifth pneumatic valve connected with the gas concentration detector can detect the gas concentration in the gas mixing tank and the reaction tank in real time to provide a basis for program adjustment.

[0060] In an optimal implementation, in order to ensure the safe operation of the system, a temperature adjusting device can be arranged on the reaction tank, including a heating device and a cooling pipe to adjust the temperature in the reaction tank, such as cooling water is filled into the reaction tank to cool the reaction tank, a reaction tank with a jacket layer can be selected, cooling water is filled into the jacket layer to cool, or a spiral cooling water pipe is arranged in the reaction tank to control the temperature in the reaction tank within the allowable temperature range.

[0061] Those skilled in the art will appreciate that the application can be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. Though the present application has been described in connection with particular embodiments thereof, it will be understood that it is capable of further modifications and this application is intended to cover any variations uses or adaptations of the application following in general the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains.

Claims

1. A PLC program control method of a carbonization apparatus, characterized by, The method comprises the following steps: 1) Obtain the target gas concentration x and the total pressure of the gas in the gas mixing tank P h vacuumize the gas mixing tank; 2) according to the obtained target gas concentration, outputting an adjusting signal to each pneumatic valve, opening and closing the pneumatic valve on the gas distribution pipeline according to the adjusting signal, and sequentially introducing industrial carbon dioxide with a carbon dioxide concentration of N and air into the gas mixing tank until the gas pressure measurement value in the gas mixing tank is the set total gas pressure P of the gas mixing tank h , and stopping the air inlet; 3) heating the gas mixing tank to mix the gas uniformly until the difference between the detection value y and the target gas concentration x is less than the tolerance; 4) setting the parameters of the reaction tank, the required gas concentration for the reaction is C0, the required gas pressure value is P0, and the required reaction time is t, vacuumizing the reaction tank, adjusting the pneumatic valve on the reaction tank according to the adjustment signal, and inputting the uniformly mixed gas in the gas mixing tank into the reaction tank until the set pressure value and / or gas concentration required for the reaction is reached; 5) adjusting the pneumatic valve on the reaction tank according to the adjustment signal to ensure that the measured pressure value and / or gas concentration in the reaction tank during the carbonization reaction approaches the set pressure value and / or gas concentration; In step 3), the difference between the gas concentration detection results of at least two times during the gas mixing process in the gas mixing tank is less than 1%vol; In Step 3), when the difference between the detected value y in the gas mixing tank and the target gas concentration x is greater than the tolerance, industrial carbon dioxide gas or air is supplied to the gas mixing tank, and if y > x, air is supplied until the gas pressure is y*P h , and if y < x, industrial carbon dioxide is supplied until the gas pressure is (N-y)*P h / (N-x).

2. The PLC program control method of a carbonization apparatus according to claim 1, characterized by, In step 5), the detected pressure value in the reaction tank is greater than the set pressure value, and the exhaust end of the reaction tank is opened by the adjustment signal until the detected pressure value is equal to the set pressure value; the detected pressure value in the reaction tank is less than the set pressure value, and the gas inlet end of the reaction tank is opened by the adjustment signal until the detected pressure value is equal to the set pressure value.

3. The PLC program control method of a carbonization apparatus according to claim 1, characterized by, In step 5), the detected gas concentration in the reaction tank is less than the set gas concentration, and the gas inlet end and the exhaust end of the reaction tank are opened by the adjustment signal until the detected gas concentration is equal to the set gas concentration.

4. A PLC program control device of a carbonization apparatus using the control method according to any one of claims 1 to 3, characterized by The system comprises a PLC control system, a reaction tank and at least one gas mixing tank, the gas outlet end of the gas mixing tank is connected with the gas inlet end of the reaction tank, a vacuum pump is connected with the gas mixing tank, a heating assembly is arranged in the gas mixing tank, an air inlet pipeline is connected with the gas inlet end of the gas mixing tank, and a gas pressure detector and a gas concentration detector are arranged on the gas mixing tank and the reaction tank, and the gas pressure detector and the gas concentration detector are signal connected with the PLC control system.

5. The PLC program control device of the carbonization apparatus according to claim 4, wherein The air inlet pipeline of the gas mixing tank is provided with first and second pneumatic valves for adjusting air and carbon dioxide gas, a fourth pneumatic valve is arranged between the gas mixing tank and the reaction tank, a sixth pneumatic valve is arranged at the exhaust end of the reaction tank, and the first, second, fourth and sixth pneumatic valves are signal connected with the PLC control system.

6. The PLC program control device of the carbonization apparatus according to claim 4, wherein The reaction tank is further connected with a temperature sensor, and the temperature sensor is connected with the PLC control system.

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