CN113219919B - Training system based on oxidation process - Google Patents
Training system based on oxidation process Download PDFInfo
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- CN113219919B CN113219919B CN202110466721.1A CN202110466721A CN113219919B CN 113219919 B CN113219919 B CN 113219919B CN 202110466721 A CN202110466721 A CN 202110466721A CN 113219919 B CN113219919 B CN 113219919B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41875—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by quality surveillance of production
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32368—Quality control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention discloses a training system based on an oxidation process, which comprises: the system comprises an oxidation simulation facility, a data transmission module, a safety protection module and a data processing module, wherein the oxidation simulation facility takes the flow of a plurality of selection logic blocks as output results, and the output results are correspondingly displayed through an upper computer and the field simulation measuring instrument after logical operation; and the selection logic block outputs the result of taking the flow as the selection logic block after data logic operation based on the current opening and closing state of the simulation valve, the current simulation liquid level counting value and/or the current numerical value of the field simulation measuring instrument and in combination with the flow change value caused by operation. The advantages are that: the training device is not an operation training mode of common training assessment equipment, a student can randomly operate any step during actual operation, strong logic operation capability is built in an operation program, the material state can be simulated in real time according to various operations of the student, and the practical production is close to the practical production.
Description
Technical Field
The invention relates to a control system based on an oxidation process training, in particular to a training system based on an oxidation process.
Background
The hazardous chemical process is a process which can cause fire, explosion and poisoning in production, and the oxidation process is a process for issuing key supervision and hazardous chemical process by the national safety supervision headquarter for issuing first key supervision and hazardous chemical process catalogues. According to the regulations, special operators of production and management units must be trained through special safety operations according to the relevant national regulations to obtain the qualification certificate of special operation operations, so that the operators can work on duty.
In contrast, the company applies for: a hydrogenation training examination device; application No.: 201922441426.1. however, this device is simple, allows for less subject examination, and does not provide training for a student's understanding of the operation of the oxidation process.
At present, training objects of a chemical practical training base device are mainly enterprise training and assessment, so that the requirements on the process flow of the training device are high. Therefore, an oxidation process training and checking system suitable for a chemical training base needs to be developed.
Because most of the raw materials of chemical equipment are toxic and dangerous, a simulation system aiming at the practical training and examination in the aspect of the oxidation process does not exist at present.
Disclosure of Invention
The invention provides a training system based on an oxidation process, aiming at solving the problem that oxidation training and examination equipment are lacked in chemical oxidation process teaching.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oxidation process based training system comprising:
an oxidation simulation facility, comprising: the device comprises simulation equipment for simulating an oxidation process, a pipeline arranged between the simulation equipment, a simulation valve, a simulation flowmeter, a simulation liquid level meter and a field simulation measuring instrument, wherein the simulation valve, the simulation flowmeter, the simulation liquid level meter and the field simulation measuring instrument are arranged on the simulation equipment;
the data transmission module is electrically connected with the simulation valve, the simulation flowmeter, the simulation liquid level meter and the field simulation measuring instrument;
and the processing module takes the flow of the plurality of selection logic blocks as an output result, and correspondingly displays the output result through an upper computer and the field simulation measuring instrument after the output result is subjected to logic operation.
And the selection logic block outputs the result of taking the flow as the selection logic block after data logic operation based on the current opening and closing state of the simulation valve, the current simulation liquid level counting value and/or the current numerical value of the field simulation measuring instrument and in combination with the flow change value caused by operation. Here, it should be noted that: in the present invention, the actual circuit connection between the data transmission module and the data processing module may refer to the prior art, such as circuit board control using a mounted chip, and the like, and a specific chip model uses an STM32F103C8T6 chip, and the like.
The safety protection module is used for detecting whether the fluctuation of the simulation liquid level meter exceeds a certain threshold range; if yes, starting an audible and visual alarm and/or activating a protection mechanism of simulation equipment at the installation position of the simulation liquid level meter.
Further, the simulation apparatus includes: the oxidation process is a process for preparing formaldehyde by oxidizing methanol.
Further, according to the process for preparing formaldehyde by oxidizing methanol, a methanol raw material tank, a head tank, a methanol evaporator, a ternary mixer, a flame arrester, a filter, a fixed bed reactor, a first absorption tower and a second absorption tower are connected in sequence; further comprising: a formaldehyde absorption system for absorbing formaldehyde in the first absorption tower and the second absorption tower and a formaldehyde recovery system for recovering the aqueous solution after absorbing the formaldehyde; the formaldehyde recovery system comprises: the system comprises a first temperature exchanger, a second temperature exchanger and a formaldehyde storage tank; a flow meter 103 is arranged between the methanol evaporator and the ternary mixer; the fixed bed reactor is sequentially connected with a steam drum and a steam distributor; the steam distributor is connected with the methanol evaporator through the steam-water separator; the steam distributor is also connected with a flame arrester; the inner cavity of the methanol evaporator is communicated with an air supply system, and the outside of the methanol evaporator is connected with a heat circulation system.
Further, a liquid level meter 101 is arranged on the head tank, and a hand valve 101, a flow meter 112 and a hand valve 104 are connected in series between the head tank and the methanol evaporator; the hand valve 104 is connected with the hand valve 102, the regulating valve 101 and the hand valve 103 in parallel;
the selection logic block includes:
if the liquid level meter 101 is greater than 0 and the hand valve 101, the hand valve 102 and the hand valve 103 are opened, the regulating valve 101 and the flow meter 112 have a linear relation, and the opening degree of the regulating valve 101 is 0 to 100 corresponding to the value of the flow meter 112 of 0 to 2300 Kg/h;
if the liquid level meter 101 is greater than 0 and the hand valve 101, the hand valve 102, the hand valve 103 and the hand valve 104 are opened, the regulating valve 101 and the flow meter 112 have a linear relation, and the opening degree of the regulating valve 101 is 0 to 100 corresponding to the value of the flow meter 112 to be 0 to 2500 Kg/h;
if level gauge 101>0, hand valve 101 or 102 or 103 is closed, and hand valve 104 is closed, flow meter 112 is zero;
if the liquid level meter 101 is greater than 0, the hand valve 102 or the hand valve 103 is closed, and the hand valve 101 and the hand valve 104 are opened, the flow meter 112 is in a fixed value;
if the flow meter 101 is zero, the flow meter 112 is zero;
if the flow meter 101 is under automatic control, the opening of the regulating valve 101 maintains the liquid level meter 102 between 48% and 52%.
Further, the air supply system includes: a hand valve 106, a pump 101, a pressure gauge 101, a hand valve 107, an adjusting valve 102 and a flow meter 102 which are communicated with the air in sequence are communicated with the methanol evaporator;
the selection logic block includes:
if the pump 101 is opened and the hand valve 107 and the hand valve 106 are opened, the flow meter 102 and the regulating valve 102 have a linear relationship;
if the pump 101 is opened and the hand valve 107 and the hand valve 106 are opened, the pressure gauge 101 and the regulating valve 102 have a linear relationship;
if the pump 101 is on, the hand valve 106 is open and the hand valve 107 is closed, the pressure gauge 101 is 0.16 Mpa;
if the hand valve 107 and the hand valve 106 are closed, the pump 101 is started, and the pressure gauge 101 is 0.01 Mpa;
when the hand valve 102 is automatically operated, the flow meter 111 is controlled by the control valve 102 so that the opening thereof is controlled to be (0.2 × flow meter 102)/(flow meter 103 value — flow meter 102 value) in the range of 0.36 to 0.44.
Further, a flow meter 103 and a hand valve 105 are arranged between the methanol evaporator and the ternary mixer; a flow meter 111 is arranged between the ternary mixer and the steam-water separator; a flow meter 104 is arranged between the flame arrester and the fixed bed reactor;
the selection logic block includes:
if the steam distributor is communicated with the steam-water separator, the opening degree of the regulating valve 103 is 0-100, and the value of the corresponding flowmeter 111 is 0-2300 Kg/h;
if the regulating valve 103 is turned on automatically, the regulating valve 103 controls the value of the flow meter 111 to be the value of the flow meter 103-the value of the flow meter 102;
the flow meter 104 indicates the value of the flow meter 103 + the value of the flow meter 111.
Further, the fixed bed reactor is provided with a thermometer 103 which is communicated with the inner cavity and is controlled by the opening degree of an adjusting valve 103, and the adjusting valve 103 is arranged between the ternary mixer and the steam-water separator; an opening valve 106 is arranged on a pipeline from the steam drum to the steam distributor, and the opening of the opening valve 106 controls the pressure of the steam drum; an opening valve 104 and a thermometer 107 are arranged between the steam pocket and a water supply source, and the opening of the opening valve 104 controls a liquid level meter 104 of the steam pocket; a flow meter 109 and a hand valve 114 are arranged on a pipeline from the steam distributor to the steam drum; a pressure gauge 107 is arranged on the steam distributor; a thermometer 106 is connected in series near the discharge outlet at the bottom of the fixed bed reactor; a hand valve 116 is arranged on a pipeline from the steam drum to the direction of the fixed bed reactor;
the selection logic block includes:
if the hand valve 114 is opened and the pressure gauge 107 is greater than the pressure gauge 106, the flow meter 109 has a value of 500 to 0 corresponding to 0 to 0.2Mpa of the pressure gauge 106;
if the value of the pressure gauge 107 is less than or equal to the value of the pressure gauge 106, the flow meter 109 is zero;
if the value of the thermometer 103 is less than or equal to 120 degrees, the liquid level meter 104 is more than 0, and the hand valve 116 is opened, the thermometer 106 rises to 90 degrees;
if the value of the thermometer 103 is less than or equal to 120 degrees and the hand valve 116 is closed, the thermometer 106 is lowered to 25 degrees;
if the value of the thermometer 103 is less than or equal to 120 ℃, the hand valve 116 is opened, and the flow meter 109 is greater than 0, the temperature of the thermometer 106 rises to 105 ℃;
if thermometer 103 actually measures > 120 degrees, thermometer 106 measures thermometer 107 measures + thermometer 107 measures (thermometer 103 actually measures-120).
Further, the bottoms of the first absorption tower and the second absorption tower are respectively provided with a liquid level meter 201 and a liquid level meter 202; the formaldehyde recovery system comprises: a liquid outlet of the first absorption tower is sequentially connected with a pump 201 and a pressure gauge 201 in series; the pressure gauge 201 is connected with a formaldehyde storage tank through a flow meter 205 controlled by the opening degree of a regulating valve 205, and the pressure gauge 201 is also connected with a formaldehyde recovery system through a flow meter 204 controlled by the opening degree of a regulating valve 204;
the selection logic block includes:
if the liquid level meter 201 is greater than 0, and the pump 201 is started, the first absorption tower is unblocked to the formaldehyde storage tank, and the opening degree of the hand valve 204 is 0-100, which corresponds to the range of the pressure meter 201 from 0.18MPa to 0.13 MPa;
if the liquid level meter 201 is greater than 0, and the pump 201 is started, the first absorption tower is blocked to the formaldehyde storage tank, and the value of the pressure meter 201 is 0.18 Mpa;
if the liquid level meter 201 is equal to 0, the pump 201 stops or the first absorption tower is blocked to the formaldehyde storage tank, and the pressure gauge 201 is zero;
if the liquid level meter 201 is equal to 0, the pump 201 stops or the first absorption tower is blocked to the formaldehyde storage tank, and the flow meter 204 is zero;
if the opening of the regulating valve 205 is in linear correspondence with the flow meter 205;
if the pump 201 is started, the first absorption tower (A71) is unblocked to the formaldehyde storage tank, and the adjusting range of the adjusting valve 204 is in linear relation with the range of the flow meter 204.
Compared with the prior art, the invention has the following beneficial effects: the training device is not a step-by-step operation training mode of common training assessment equipment, a student can randomly perform operation of any step during actual operation, strong logic operation capability is built in an operation program, the material state can be simulated in real time according to various operations of the student, and the approach to actual production is realized.
Drawings
FIG. 1 is a schematic diagram showing the simulation of the process for preparing formaldehyde by oxidizing methanol according to the present invention;
FIG. 2 is a schematic diagram of a simulation of the formaldehyde absorption and formaldehyde recovery process of the present invention.
In the figure, a0 methanol raw material tank, an A1 elevated tank, an A2 methanol evaporator, an A21 air supply system, an A22 heat circulation system, an A3 ternary mixer, an A31 steam-water separator, an A4 flame arrester, an A5 filter, an A6 fixed bed reactor, an A61 steam pocket, an A62 steam distributor, an A71 first absorption tower, an A72 second absorption tower, an A81 first temperature exchanger, an A82 second temperature exchanger and an A83 formaldehyde storage tank.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1 and 2, an oxidation process-based training system includes:
an oxidation simulation facility, comprising: the device comprises simulation equipment for simulating an oxidation process, a pipeline arranged between the simulation equipment, a simulation valve, a simulation flowmeter, a simulation liquid level meter and a field simulation measuring instrument, wherein the simulation valve, the simulation flowmeter, the simulation liquid level meter and the field simulation measuring instrument are arranged on the simulation equipment; the actual oxidation simulation facility can be in many process forms. Here, a process for preparing formaldehyde by oxidizing methanol is taken as an example.
In particular, it is possible to let the simulation device comprise:
according to the process for preparing formaldehyde by oxidizing methanol, a methanol raw material tank A0, a head tank A1, a methanol evaporator A2, a ternary mixer A3, a flame arrester A4, a filter A5, a fixed bed reactor A6, a first absorption tower A71 and a second absorption tower A72 are connected in sequence;
further comprising: a formaldehyde absorption system for absorbing formaldehyde in the first absorption tower A71 and the second absorption tower A72 and a formaldehyde recovery system for recovering the aqueous solution after absorbing the formaldehyde; the formaldehyde recovery system comprises: a first temperature exchanger A81, a second temperature exchanger A82, and a formaldehyde storage tank A83; a flow meter 103 is arranged between the methanol evaporator A2 and the ternary mixer A3;
the fixed bed reactor A6 is sequentially connected with a steam drum A61 and a steam distributor A62; the steam distributor A62 is connected with the methanol evaporator A2 through a steam-water separator A31; the vapor distributor a62 is also connected with a flame arrestor a 4;
the inner cavity of the methanol evaporator A2 is communicated with an air supply system A21, and the outside is connected with a heat circulation system A22.
The data transmission module is electrically connected with the simulation valve, the simulation flowmeter, the simulation liquid level meter and the field simulation measuring instrument;
the processing module takes the flow of the plurality of selection logic blocks as an output result, and correspondingly displays the output result through an upper computer and the field simulation measuring instrument after the output result is subjected to logic operation;
the selection logic block outputs the result of taking the flow as the selection logic block after data logic operation based on the current starting and stopping state of the simulation valve, the current simulation liquid level counting value and/or the current numerical value of the field simulation measuring instrument and combining the flow change value caused by operation;
the safety protection module is used for detecting whether the fluctuation of the simulation liquid level meter exceeds a certain threshold range; if yes, starting an audible and visual alarm and/or activating a protection mechanism of simulation equipment at the installation position of the simulation liquid level meter.
Wherein, the safety protection module includes: the alarm module and the interlocking module;
the alarm module is used for detecting whether the fluctuation range of the simulation liquid level meter exceeds a certain threshold range; if yes, starting an audible and visual alarm;
the linkage module is used for detecting whether the fluctuation range of the simulation liquid level meter exceeds a certain threshold range and exceeds another threshold range; if yes, starting a protection mechanism for the simulation equipment related to the simulation liquid level meter;
the further threshold range maximum is greater than the threshold range maximum and the further threshold range minimum is less than the threshold range minimum.
The protection mechanism in the security protection module comprises: and closing a liquid inlet and a liquid outlet of the simulation equipment at the installation position of the simulation liquid level meter. Taking the liquid level meter 101 in the invention as an example, if the liquid level exceeds 85% or is lower than 20%, an alarm is given; if the liquid level exceeds 95% or is lower than 5%, both the liquid inlet and the liquid outlet of the high level tank A1 in which the liquid level gauge 101 is installed are closed.
To achieve more realistic operation, embodiments of the present invention include the following:
for the first embodiment of the present invention: a liquid level meter 101 is arranged on the head tank A1, and a hand valve 101, a flow meter 112 and a hand valve 104 are connected in series between the head tank A1 and the methanol evaporator A2; the hand valve 104 is connected with the hand valve 102, the regulating valve 101 and the hand valve 103 in parallel;
the selection logic block includes:
if the liquid level meter 101 is greater than 0 and the hand valve 101, the hand valve 102 and the hand valve 103 are opened, the regulating valve 101 and the flow meter 112 have a linear relation; specifically, the following steps can be performed: the opening degree of the regulating valve 101 is 0 to 100, which corresponds to the value of the flowmeter 112 of 0 to 2300 Kg/h;
if the liquid level meter 101 is greater than 0 and the hand valve 101, the hand valve 102, the hand valve 103 and the hand valve 104 are opened, the regulating valve 101 and the flow meter 112 have a linear relationship; specifically, the following steps can be performed: the opening degree of the regulating valve 101 is 0 to 100, which corresponds to the value of the flowmeter 112 to be 0 to 2500 Kg/h;
if level gauge 101>0, hand valve 101 or 102 or 103 is closed, and hand valve 104 is closed, flow meter 112 is zero;
if the liquid level meter 101 is greater than 0, the hand valve 102 or the hand valve 103 is closed, and the hand valve 101 and the hand valve 104 are opened, the flow meter 112 is in a fixed value;
if the flow meter 101 is zero, the flow meter 112 is zero;
if the flow meter 101 is under automatic control, the opening of the regulating valve 101 maintains the liquid level meter 102 between 48% and 52%.
The relevant devices can automatically have feedback through the built-in selection logic of different situations.
In the training process, the student adjusts the height of the liquid level meter 101 on the head tank by controlling the opening of the adjusting valve 101 and the hand valve 101 at the root of the head tank so as to ensure that the amount of the methanol solution stored is within the normal use range. The student adjusts the flow rate of methanol entering the methanol evaporator a2 by controlling the opening of the regulating valve 101. During the adjustment process, the student can set a fixed value by controlling the opening value of the adjusting valve, and the fixed value is automatically adjusted by the system. Through the real standard of first embodiment, can make the student master methyl alcohol feed flow control and methyl alcohol head tank liquid level control, it is most mainly: the student controls the valves and not only displays them on the flow meter 112, but the value of the flow meter 112 is also used as the feed rate for the next process step to be recalculated. Thus, the embodiments can be used not only alone, but also in combination with subsequent process steps.
Second embodiment of the present invention: the air supply system a21 includes: a hand valve 106, a pump 101, a pressure gauge 101, a hand valve 107, an adjusting valve 102 and a flow meter 102 which are communicated with the air in sequence are communicated with a methanol evaporator A2;
the selection logic block includes:
if the pump 101 is opened and the hand valve 107 and the hand valve 106 are opened, the flow meter 102 and the regulating valve 102 have a linear relationship;
if the pump 101 is opened and the hand valve 107 and the hand valve 106 are opened, the pressure gauge 101 and the regulating valve 102 have a linear relationship;
if the pump 101 is on, the hand valve 106 is open and the hand valve 107 is closed, the pressure gauge 101 is 0.16 Mpa;
if the hand valve 107 and the hand valve 106 are closed, the pump 101 is started, and the pressure gauge 101 is 0.01 Mpa;
when the hand valve 102 is turned on automatically, the flow meter 111 is controlled by the regulating valve 102 through the opening degree, so that the value of 0.2 × flow meter 102/flow meter 103-flow meter 102 is between 0.36 and 0.44.
In the training process, the trainees control the flow of air entering the methanol evaporator A2 by controlling the opening of the regulating valve 102 and the opening and closing of the hand valve 106 and the hand valve 107. During the adjustment process, the stable air output flow value can be obtained by controlling the opening degree of the adjusting valve 102 or by setting a fixed value for automatic adjustment. The oxygen flow rate in the air is proportional to the methanol flow rate in the first embodiment into the methanol evaporator a 2. The actual ratio of the two can be controlled by the trainee according to the actual flow.
In this embodiment, the trainee can not only provide training for the supply of a single oxygen content, but also obtain a suitable alcohol to oxygen ratio in combination with the first embodiment, the suitable ratio of alcohol to oxygen being beneficial for the generation of a suitable methanol vapor.
The third embodiment of the present invention: a flow meter 103 and a hand valve 105 are arranged between the methanol evaporator A2 and the ternary mixer A3; a flow meter 111 is arranged between the ternary mixer A3 and the steam-water separator A31; a flow meter 104 is arranged between the flame arrester A4 and the fixed bed reactor A6;
the selection logic block includes:
if the steam distributor A62 is communicated with the steam-water separator A31, the opening degree of the regulating valve 103 is 0 to 100, and the value of the corresponding flowmeter 111 is 0 to 2300 Kg/h;
if the regulating valve 103 is turned on automatically, the regulating valve 103 controls the value of the flow meter 111 to be the value of the flow meter 103-the value of the flow meter 102;
the flow meter 104 indicates the value of the flow meter 103 + the value of the flow meter 111.
In the training process, the student controls the steam flow entering the ternary mixer A3 by controlling the opening of the regulating valve 103. In the adjusting process, the size of the flow valve can be controlled by controlling the opening of the adjusting valve 103.
In the first and second embodiments, the steam flow is mixed with the methanol flow in the first embodiment and the air flow in the second embodiment in a certain ratio in the ternary mixer a 3.
Therefore, in this embodiment, the student can not only exercise the control of the steam flow rate alone, but also perform the secondary mixing of the methanol steam and the oxygen flow rate, and the obtained flow rate value is displayed on the flow meter 104.
Meanwhile, the mixed gas is introduced into the fixed bed reactor a6 in the fourth embodiment, and is logically calculated as the intake air amount in the next process step.
The fourth embodiment of the present invention: the fixed bed reactor A6 is provided with a thermometer 103 which is communicated with the inner cavity and is controlled by adjusting the opening degree of the valve 103, and the adjusting valve 103 is arranged between the ternary mixer A3 and the steam-water separator A31; an opening valve 106 is arranged on a pipeline from the steam drum A61 to the steam distributor A62, and the opening of the opening valve 106 controls the pressure of the steam drum A61; an opening valve 104 and a thermometer 107 are arranged between the steam pocket A61 and a water supply source, and the opening of the opening valve 104 controls a liquid level meter 104 of the steam pocket A61; a flow meter 109 and a hand valve 114 are arranged on the pipelines from the steam distributor A62 to the steam pocket A61; a pressure gauge 107 is arranged on the steam distributor A62; a thermometer 106 is connected in series near the bottom discharge outlet of the fixed bed reactor A6; a hand valve 116 is arranged on a pipeline from the steam drum A61 to the fixed bed reactor A6;
the selection logic block includes:
if the hand valve 114 is opened and the pressure gauge 107 is greater than the pressure gauge 106, the flow meter 109 has a value of 500 to 0 corresponding to 0 to 0.2Mpa of the pressure gauge 106;
if the value of the pressure gauge 107 is less than or equal to the value of the pressure gauge 106, the flow meter 109 is zero;
if the value of the thermometer 103 is less than or equal to 120 degrees, the liquid level meter 104 is more than 0, and the hand valve 116 is opened, the thermometer 106 rises to 90 degrees;
if the value of the thermometer 103 is less than or equal to 120 degrees and the hand valve 116 is closed, the thermometer 106 is lowered to 25 degrees;
if the value of the thermometer 103 is less than or equal to 120 ℃, the hand valve 116 is opened, and the flow meter 109 is greater than 0, the temperature of the thermometer 106 rises to 105 ℃;
if thermometer 103 actually measures > 120 degrees, thermometer 106 measures thermometer 107 measures + thermometer 107 measures (thermometer 103 actually measures-120).
In the training process of trainees, the temperature control of the fixed bed reactor A6 is a problem to be mastered, and the outlet temperature of the fixed bed reactor A6 is related to factors such as a steam drum water supplementing temperature TI107, a steam drum steam inlet flow FT107 and a hand valve HV 116. When trainees train, the trainees can correspondingly adjust according to the logic blocks and the TIRA103 value of the fixed bed reactor A6 thermometer. Through practical training, a student can master the method for adjusting the temperature of the reactor and understand the temperature control logic.
The fifth embodiment of the present invention: the bottoms of the first absorption tower A71 and the second absorption tower A72 are respectively provided with a liquid level meter 201 and a liquid level meter 202; the formaldehyde recovery system comprises: the liquid outlet of the first absorption tower A71 is connected with a pump 201 and a pressure gauge 201 in series; the pressure gauge 201 is connected with a formaldehyde storage tank through a flow meter 205 controlled by the opening degree of a regulating valve 205, and the pressure gauge 201 is also connected with a formaldehyde recovery system through a flow meter 204 controlled by the opening degree of a regulating valve 204;
the selection logic block includes:
if the liquid level meter 201 is greater than 0 and the pump 201 is started, the first absorption tower A71 is unblocked to the formaldehyde storage tank, and the opening degree of the hand valve 204 is 0 to 100, which corresponds to the range of the pressure meter 201 from 0.18MPa to 0.13 MPa;
if the liquid level meter 201 is greater than 0 and the pump 201 is started, the first absorption tower A71 to the formaldehyde storage tank is blocked, and the value of the pressure meter 201 is 0.18 Mpa;
if the liquid level meter 201 is equal to 0, the pump 201 stops or the first absorption tower a71 is blocked to the formaldehyde storage tank, and the pressure gauge 201 is zero;
if the liquid level meter 201 is equal to 0, the pump 201 stops or the first absorption tower A71 is blocked to the formaldehyde storage tank, and the flow meter 204 is zero;
if the opening of the regulating valve 205 is in linear correspondence with the flow meter 205;
if the pump 201 is started, the first absorption tower (A71) is unblocked to the formaldehyde storage tank, and the adjusting range of the adjusting valve 204 is in linear relation with the range of the flow meter 204.
In the training process of the trainees, the liquid level control of the first absorption tower A71 and the second absorption tower A72 and the absorption and recovery of formaldehyde are courses which the trainees need to master. In contrast, in the fifth embodiment, the first absorption tower a71 level gauge 201 is controlled as an example, and the trainee can manage whether the first absorption tower a71 is unblocked to the formaldehyde storage tank or not according to the control of the pump 201 and the valve, so that the trainee can control the pressure inside the first absorption tower a71 or the second absorption tower a72, and can conveniently master the practical training relationship of the absorption tower. Meanwhile, the student can adjust the opening degrees of the regulating valve 204 and the regulating valve 205 to adjust the value of the liquid level meter 201, and control the production flow rate and the return flow rate of the first absorption tower a 71. Through practical training, a student can master the method for adjusting the liquid level of the absorption tower and understand the liquid level control logic.
Meanwhile, the combination of the formaldehyde recovery process can enable students to have more macroscopic hold on the steps and the flow of the whole oxidation process.
According to the five embodiments, the invention not only can enable a student to carry out practical training assessment on a single step or process, but also can enable a plurality of embodiments to be combined to realize more assessment functions. Therefore, compared with the existing assessment equipment, the method has the advantages of decentralization and capability of integrally assessing the comprehension of the student on the oxidation process.
The above embodiments are merely practical embodiments for achieving the object of the present invention, and specifically, all of the five embodiments may be embodied in the same technical solution, or may be used alone. The aim of the invention is achieved.
Claims (5)
1. An oxidation process based training system, comprising:
an oxidation simulation facility, comprising: the device comprises simulation equipment for simulating an oxidation process, a pipeline arranged between the simulation equipment, a simulation valve, a simulation flowmeter, a simulation liquid level meter and a field simulation measuring instrument, wherein the simulation valve, the simulation flowmeter, the simulation liquid level meter and the field simulation measuring instrument are arranged on the simulation equipment;
the data transmission module is electrically connected with the simulation valve, the simulation flowmeter, the simulation liquid level meter and the field simulation measuring instrument;
the processing module takes the flow of the plurality of selection logic blocks as an output result, and correspondingly displays the output result through an upper computer and the field simulation measuring instrument after the output result is subjected to logic operation;
the selection logic block outputs the result of taking the flow as the selection logic block after data logic operation based on the current starting and stopping state of the simulation valve, the current simulation liquid level counting value and/or the current numerical value of the field simulation measuring instrument and combining the flow change value caused by operation;
the safety protection module is used for detecting whether the fluctuation of the simulation liquid level meter exceeds a certain threshold range; if yes, starting an audible and visual alarm and/or activating a protection mechanism of simulation equipment at the installation position of the simulation liquid level meter; the simulation apparatus includes: the oxidation process is a process for preparing formaldehyde by oxidizing methanol;
the simulation apparatus includes:
according to the process for preparing formaldehyde by oxidizing methanol, a methanol raw material tank (A0), an elevated tank (A1), a methanol evaporator (A2), a ternary mixer (A3), a flame arrester (A4), a filter (A5), a fixed bed reactor (A6), a first absorption tower (A71) and a second absorption tower (A72) are connected in sequence;
further comprising: a formaldehyde absorption system for absorbing formaldehyde in the first absorption tower (A71) and the second absorption tower (A72) and a formaldehyde recovery system for recovering the aqueous solution after absorbing the formaldehyde; the formaldehyde recovery system comprises: a first temperature exchanger (a81), a second temperature exchanger (a82) and a formaldehyde storage tank (a 83); a flow meter 103 is arranged between the methanol evaporator (A2) and the ternary mixer (A3);
the fixed bed reactor (A6) is connected with a steam drum (A61) and a steam distributor (A62) in sequence; the steam distributor (A62) is connected with the methanol evaporator (A2) through a steam-water separator (A31); the steam distributor (A62) is also connected with a flame arrester (A4);
the inner cavity of the methanol evaporator (A2) is communicated with an air supply system (A21), and the outside of the methanol evaporator is connected with a heat circulation system (A22);
a liquid level meter 101 is arranged on the head tank (A1), and a hand valve 101, a flow meter 112 and a hand valve 104 are connected in series between the head tank (A1) and the methanol evaporator (A2); the hand valve 104 is connected with the hand valve 102, the regulating valve 101 and the hand valve 103 in parallel;
the selection logic block includes:
if the liquid level meter 101 is greater than 0 and the hand valve 101, the hand valve 102 and the hand valve 103 are opened, the regulating valve 101 and the flow meter 112 have a linear relation, and the opening degree of the regulating valve 101 is 0 to 100 corresponding to the value of the flow meter 112 of 0 to 2300 Kg/h;
if the liquid level meter 101 is greater than 0 and the hand valve 101, the hand valve 102, the hand valve 103 and the hand valve 104 are opened, the regulating valve 101 and the flow meter 112 have a linear relation, and the opening degree of the regulating valve 101 is 0 to 100 corresponding to the value of the flow meter 112 to be 0 to 2500 Kg/h;
if level gauge 101>0, hand valve 101 or 102 or 103 is closed, and hand valve 104 is closed, flow meter 112 is zero;
if the liquid level meter 101 is greater than 0, the hand valve 102 or the hand valve 103 is closed, and the hand valve 101 and the hand valve 104 are opened, the flow meter 112 is in a fixed value;
if the flow meter 101 is zero, the flow meter 112 is zero;
if the flow meter 101 is under automatic control, the opening of the regulating valve 101 maintains the liquid level meter 102 between 48% and 52%.
2. The oxidation process-based training system of claim 1, wherein the safety protection module comprises: the alarm module and the interlocking module;
the alarm module is used for detecting whether the fluctuation range of the simulation liquid level meter exceeds a certain threshold range; if yes, starting an audible and visual alarm;
the linkage module is used for detecting whether the fluctuation range of the simulation liquid level meter exceeds a certain threshold range and exceeds another threshold range; if yes, starting a protection mechanism for the simulation equipment related to the simulation liquid level meter;
the further threshold range maximum is greater than the threshold range maximum and the further threshold range minimum is less than the threshold range minimum.
3. The oxidation process-based training system of claim 1, wherein: the protection mechanism in the security protection module comprises: and closing a liquid inlet and a liquid outlet of the simulation equipment at the installation position of the simulation liquid level meter.
4. The oxidation process-based training system of claim 1, wherein: the air supply system (A21) comprises: a hand valve 106, a pump 101, a pressure gauge 101, a hand valve 107, an adjusting valve 102 and a flow meter 102 which are communicated with the air in sequence are communicated with a methanol evaporator (A2); a flow meter 111 is arranged between the ternary mixer (A3) and the steam-water separator (A31);
the selection logic block includes:
if the pump 101 is opened and the hand valve 107 and the hand valve 106 are opened, the flow meter 102 and the regulating valve 102 have a linear relationship;
if the pump 101 is opened and the hand valve 107 and the hand valve 106 are opened, the pressure gauge 101 and the regulating valve 102 have a linear relationship;
if the pump 101 is on, the hand valve 106 is open and the hand valve 107 is closed, the pressure gauge 101 is 0.16 Mpa;
if the hand valve 107 and the hand valve 106 are closed, the pump 101 is started, and the pressure gauge 101 is 0.01 Mpa;
if the hand valve 102 is automatically controlled, the flow meter 111 is controlled by the regulating valve 102 through the opening degree so that the (0.2 × flow meter 102)/(flow meter 103 value — flow meter 102 value) is between 0.36 and 0.44.
5. The oxidation process-based training system of claim 4, wherein: a flow meter 103 and a hand valve 105 are arranged between the methanol evaporator (A2) and the ternary mixer (A3); (ii) a A flow meter 104 is arranged between the flame arrester (A4) and the fixed bed reactor (A6); the regulating valve 103 is arranged on a pipeline between the ternary mixer (A3) and the steam-water separator (A31);
the selection logic block includes:
if the steam distributor (A62) is communicated with the steam-water separator (A31), the opening degree of the regulating valve 103 is 0 to 100, which corresponds to the value of the flow meter 111 of 0 to 2300 Kg/h;
if the regulating valve 103 is automatically controlled, the regulating valve 103 controls the value of the flow meter 111 to be the value of the flow meter 103-the value of the flow meter 102;
the flow meter 104 indicates the value of the flow meter 103 + the value of the flow meter 111.
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Denomination of invention: A training system based on oxidation process Effective date of registration: 20230217 Granted publication date: 20220208 Pledgee: Xuzhou Huaichang Investment Co.,Ltd. Pledgor: XUZHOU GUANGLIAN TECHNOLOGY Co.,Ltd. Registration number: Y2023320000080 |
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