CN211349084U - Many platforms adorn sour controlling means - Google Patents

Abstract

The utility model discloses a multi-platform acid loading control device, which comprises a plurality of acid loading platforms and an upper computer, wherein the acid loading platforms comprise a sulfuric acid tank, a manual stop valve, a pneumatic regulating valve, an electromagnetic flowmeter, an acid transporting tank car and a field control box; the sulfuric acid tank is connected with the acid conveying tank car through an acid conveying pipeline; a manual stop valve, a pneumatic regulating valve and an electromagnetic flowmeter are arranged on the acid conveying pipeline; the field control box comprises a touch screen and a PLC (programmable logic controller), and the PLC is respectively and electrically connected with the touch screen, the pneumatic regulating valve and the electromagnetic flowmeter; the upper computer is in communication connection with the PLC. The utility model discloses can effectively avoid the workman intensity of labour who exists at present loading in-process big, the sour speed of dress uncontrollable, the lower scheduling problem of security, make the loading time of every car not receive the influence of acid tank liquid level height, reach unanimously basically, realize safe and stable reliable loading.

Description

Many platforms adorn sour controlling means

Technical Field

The utility model relates to a sulphuric acid loading, concretely relates to sour controlling means of many platforms dress.

Background

At present, concentrated sulfuric acid products of some companies are transported to a storage tank through pipelines and are shipped by automobile loading. By utilizing the terrain drop between the acid tank and the loading point, the tank truck is filled with sulfuric acid through an acid conveying pipeline and two manual stop valves, and 6 sets of acid platforms are arranged.

There are problems in that:

1. the sulfuric acid liquid level on the tank truck of the acid conveying tank needs to be checked manually, the flow of the loading is controlled by manually controlling a valve, and the labor intensity of workers is high; because the influence of the height of the liquid level in the storage tank on the loading speed is large, an operator is difficult to control, and the existing safety risk is large. Once improper operation occurs, the tank truck is overloaded, overload is determined after the tank truck is overloaded, the tank truck is returned to an acid storage to discharge the overloaded sulfuric acid, and then the tank truck is overloaded, so that labor and time are wasted, and the labor intensity is high; even sulfuric acid overflows and leaks out during loading, and unpredictable consequences such as injury to operators and the like are possible to happen.

2. The existing quantitative loading controller and the upper computer on the market form an automatic loading system, and the sulfuric acid conveying and loading are generally carried out by controlling the starting and stopping of a loading pump and the opening degree of a loading valve. The output pressure change of the loading pump during working is not large, but for a loading system which utilizes the terrain drop for filling, the output pressure change of sulfuric acid when the tank is full and the tank bottom is large, and the maximum pressure change reaches 0.36 MPa. When the acid tank is full, the pressure is high, the flow rate is high, the valve is slowly opened for loading, but the loading time is short due to the high flow rate; when the liquid level of the acid tank is low, the pressure is low, the flow rate is slow, and the loading time is prolonged; the existing quantitative loading control system cannot meet the requirements that the acid loading time of each truck is controllable, and the aim of safe and stable automatic loading cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sour controlling means of many platforms dress, solve the workman intensity of labour that exists at present loading in-process big, the sour speed of dress uncontrollable, the lower scheduling problem of security, make the loading time of every car not receive the influence of acid tank liquid level height, reach unanimously basically, realize the loading of safe and stable reliable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a multi-platform acid loading control device comprises a plurality of acid loading platforms and an upper computer, wherein each acid loading platform comprises a sulfuric acid tank, a manual stop valve, a pneumatic regulating valve, an electromagnetic flowmeter, an acid conveying tank car and a field control box; the sulfuric acid tank is connected with the acid conveying tank car through an acid conveying pipeline; the acid conveying pipeline is provided with the manual stop valve, the pneumatic regulating valve and the electromagnetic flow meter; the field control box comprises a touch screen and a PLC (programmable logic controller), and the PLC is respectively and electrically connected with the touch screen, the pneumatic regulating valve and the electromagnetic flowmeter; the pneumatic regulating valve is used for receiving an output current signal of the PLC controller so as to regulate the opening of the valve, so as to control the flow of sulfuric acid, and transmitting a switch signal of opening and closing the valve in place to the PLC controller; and the upper computer is in communication connection with the PLC.

The PLC is electrically connected with a loading starting switch, a loading stopping switch, an emergency stopping button, a test button, an on-position signal switch and an off-position signal switch which are connected in parallel, and the on-position signal switch and the off-position signal switch are used for transmitting a switching signal of the pneumatic regulating valve to the PLC; the PLC is also electrically connected with the ready relay, the loading relay and the alarm output relay which are connected in parallel; and a corresponding indicator light is arranged on the cabinet door of the field control box.

Further, the host computer pass through the switch with a plurality of dress sour platform communication are connected.

Further, still be provided with alarm and power in the field control case, the alarm with PLC controller electric connection, the power with touch-sensitive screen, PLC controller, alarm, pneumatic control valve and electromagnetic flowmeter electric connection. When emergency situations such as sulfuric acid over-full loading occur, the PLC controls the alarm to give an alarm to prompt workers.

The beneficial effects of the utility model reside in that: the second manual stop valve in the original acid charging platform is replaced by a pneumatic regulating valve, so that sulfuric acid charging is carried out in a step type flow control acid charging mode, and the charging time of each part of sulfuric acid is basically the same and controllable; when can realize loading simultaneously no matter the height of sour jar liquid level, the flow of keeping setting for all the time carries out the loading, can effectively avoid utilizing the relief fall to carry out the loading, sulphuric acid is big with the big impact that the tank bottoms time output pressure variation brought of tank fullness, loading time is difficult to the accuse scheduling problem, when the loading reachs predetermined weight, automatically slow pneumatic control valve of closing, overcome the water hammer effect, satisfy loading control and realize the requirement of automatic safety in production as far as possible, get rid of the uncertainty of loading, guarantee the safety and stability of loading process. By means of the setting of the upper computer, personnel in a duty room can monitor the loading condition, and can stop loading under emergency conditions, so that the loading safety is further guaranteed.

Drawings

FIG. 1 is a schematic view of a part of the structure of an acid loading platform in an embodiment of the present invention;

fig. 2 is a schematic block diagram of a control device according to an embodiment of the present invention;

fig. 3 is a network diagram of a control device according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of an on-site control box in an embodiment of the present invention;

fig. 5 is a timing diagram of the acid loading process according to the embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, and it should be noted that the following embodiments are based on the technical solution, and the detailed embodiments and the specific operation processes are provided, but the protection scope of the present invention is not limited to the embodiments.

As shown in fig. 1-4, the multi-platform acid loading control device comprises a plurality of acid loading platforms and an upper computer 7, wherein each acid loading platform comprises a sulfuric acid tank 1, a manual stop valve 2, a pneumatic regulating valve 3, an electromagnetic flowmeter 4, an acid transporting tank truck 5 and a field control box 6; the sulfuric acid tank 1 is connected with the acid conveying tank wagon 5 through an acid conveying pipeline; the acid conveying pipeline is provided with the manual stop valve 2, the pneumatic regulating valve 3 and the electromagnetic flowmeter 4; the field control box 6 comprises a touch screen 62 and a PLC 63, and the PLC 63 is respectively and electrically connected with the touch screen 62, the pneumatic regulating valve 3 and the electromagnetic flowmeter 4; the upper computer 7 is in communication connection with the PLC 63.

As shown in fig. 4, the PLC controller is electrically connected to a start loading switch (SB1), a stop loading switch (SB2), an emergency stop button (SB0), a test button (SB3), an on-to-position signal switch (S1), and an off-to-position signal switch (S2) which are connected in parallel, and the on-to-position signal switch (S1) and the off-to-position signal switch (S2) can transmit a switching signal of the pneumatic regulator valve 3 to the PLC controller 63; the PLC is also electrically connected with a ready relay (KA1), a loading relay (KA2) and an alarm output relay (KA3) which are connected in parallel; and the cabinet door of the field control box 6 is also provided with a corresponding indicator light.

In the multi-platform acid loading control device, 6 acid loading platforms are arranged; the pneumatic control valve 3 used for replacing a second manual stop valve in the original acid loading platform receives an output current signal of the PLC 63 so as to control the opening of the valve to control the flow of sulfuric acid, and in the embodiment, the magnitude range of the current signal is 4-20 mA. Meanwhile, the switching signals of the valve opening and closing of the pneumatic control valve 3 are transmitted to the PLC controller 63. In this embodiment, the pneumatic regulating valve 3 is a fluorine-lined V-shaped regulating ball valve, which has a large flow capacity, a small pressure loss, an accurate shutoff characteristic and a control function, and a flow characteristic of approximately equal percentage. The electromagnetic flow meter 4 is used for detecting volume flow information in the sulfuric acid loading process and sending the information to the PLC 63 in the form of pulse signals and instantaneous flow signals, and the PLC 63 controls and adjusts the opening and closing and the opening of the pneumatic adjusting valve 3 according to the received signals. The manual stop valve 2 is used for manual operation, and when the automation of the acid loading platform fails, the manual stop valve 2 can be manually closed, so that the loss and the danger are reduced to the minimum. When the loading reaches the preset weight, the multi-platform acid loading control device can automatically and slowly close the pneumatic regulating valve 3, so that the water hammer effect is overcome, the requirement of realizing automatic safety production as far as possible in loading control is met, the uncertainty of loading is eliminated, and the safety and stability of the loading process are ensured. Meanwhile, the loading condition can be monitored manually through the upper computer 7, loading can be stopped under emergency, and loading safety is further guaranteed.

Further, the upper computer 7 is arranged in an on-duty room and is used for monitoring and managing the operation states of the field control boxes 6 on the 6 acid loading platforms. The PLC controller 63 and the upper computer 7 are in data communication through a PROFINET bus to upload loading states and parameters, the upper computer 7 can send monitored loading parameter set values, loading starting signals and loading stopping signals to the PLC controller 63 on the field control box 6 on each acid loading platform, and data collection, storage and monitoring can be carried out on each acid loading platform through the PLC controller 63, so that remote control of the operations of opening, stopping, adjusting and the like of the acid loading adjusting valve can be realized. Therefore, the personnel on duty can monitor the loading condition through the upper computer 7, and can stop loading in emergency, thereby further ensuring the loading safety. In this embodiment, the PLC controller 63 is selected from the controllers 63 of siemens S7-1200, the SIMATIC S7-1200 has an integrated PROFINET interface, and the CPU selects 1212C and has two AI ports and an AO output board SB1232 for adding a loop. The touch screen 62 is used for setting and displaying parameters of the acid process of the detection control device. In this embodiment, the touch screen 62 is made of welan MT8101 iE 10.1 inches, can set control parameters and process display, and is connected to the PLC controller 63 through a network cable. The upper computer 7 is provided with a WINCC monitoring system which comprises a login interface, a parameter setting and displaying interface, a loading data report inquiring interface, an alarm information inquiring interface, an operation monitoring interface and an operation recording interface and has a report printing function.

It should be noted that, when the PLC controller 63 receives the instantaneous flow rate signal of the electromagnetic flow meter 4, the PLC controller 63 controls the opening of the pneumatic control valve 3 according to the result obtained by comparing the instantaneous flow rate signal with the set value, so as to achieve loading at a given flow rate. In this embodiment, the 4-20 mA instantaneous flow signal output by the electromagnetic flowmeter 4 is converted into a voltage signal of 2-10V by an external 500 Ω resistor, and is sent to the AI port of the PLC controller 63, which is mainly used to control the opening adjustment of the pneumatic control valve 3, so that the vehicle can be stably loaded at a given flow rate during loading. When the PLC 63 receives the pulse flow signal of the electromagnetic flowmeter 4, the PLC 63 converts the signal into a weight value, when the weight value reaches a set weight, the PLC 63 controls the pneumatic regulating valve 3 to be closed, and loading is finished, namely the pulse flow signal of the electromagnetic flowmeter 4 is transmitted to be used for loading volume accumulation of sulfuric acid. In this embodiment, a pulse signal of a unit volume is sent to a high-speed counting port of the PLC controller 63 to be counted, an accumulated value is calculated by the PLC controller 63 and then compared with a set value, and if a set weight is reached, the PLC controller 63 controls the pneumatic control valve 3 to close, thereby completing loading.

Further, the upper computer 7 is in communication connection with the acid loading platforms through a switch 8.

Further, still be provided with alarm 61 and power 64 in the on-the-spot control case 6, alarm 61 with PLC controller 63 electric connection, power 64 with touch-sensitive screen 62, PLC controller 63, alarm 61, pneumatic control valve 3 and electromagnetic flowmeter 4 electric connection. When emergency situations such as sulfuric acid over-full loading occur, the PLC 63 controls the alarm 61 to give an alarm to prompt staff.

Examples

As shown in fig. 1-5, the multi-platform acid-loading control device works on the following principle:

the first stage is as follows: when loading is started (time period t0-t 1), the manual stop valve 2 is manually opened, the PLC 63 in the field control box 6 controls the pneumatic adjusting valve 3 to be slowly opened, the electromagnetic flow meter 4 starts to measure the flow of sulfuric acid in the acid conveying pipeline, when the flow of the loading sulfuric acid reaches a set Q2 value, the PLC 63 controls the opening of the pneumatic adjusting valve 3 to be unchanged, and the loading is carried out at a small flow according to the Q2 value (time period t1-t 2), so that splashing caused by large pressure flow is avoided;

and a second stage: when the small-flow loading time reaches a set value of t2, the PLC 63 controls the pneumatic regulating valve 3 to slowly increase the opening degree until the loading sulfuric acid flow reaches a set value of Q3, and the loading is carried out at a second stage according to the set value of Q3 and the large flow. In the process, the PLC 63 compares the instantaneous flow signal of the electromagnetic flowmeter 4 with a set Q3 value, and automatically controls and adjusts the opening of the pneumatic regulating valve 3 according to the deviation, so that the loading flow always tends to be consistent with the set Q3, and the influence of the liquid level in the sulfuric acid tank 1 on the loading flow is eliminated.

And a third stage: when the loading weight approaches a set value (a phase difference value can be set, such as a difference of 3 tons), the time is t3, the PLC controller 63 controls the pneumatic control valve 3 to be slowly turned down until the flow rate is the same as the set value Q1 for loading (time period t5-t 6), and the pneumatic control valve 3 is closed until the loading weight is equal to the set value, so that the loading process is finished, and the purpose of the stage is to avoid the water hammer effect caused by directly and quickly closing the valve, and the destructive force is caused. And meanwhile, the loading precision is improved. And in each loading stage, the automatic regulating valve is set according to the system parameters to reach a set flow state.

In the process of going on in above three stages, the loading condition is monitored to the room personnel on duty accessible host computer 7, prevents that the accident from taking place. By adopting the step-type flow control acid loading mode, the loading is carried out by using small flow when the loading is started, and the flow setting is gradually increased until the set flow is reached for loading; when the set loading weight is reached by quick filling, the filling flow is gradually reduced, and finally, when the set value is reached, the pneumatic regulating valve 3 is closed to finish loading, so that the loading time of each part is basically the same and controllable. Meanwhile, the valve is regulated and controlled in a given flow mode, namely, the set flow is always kept for loading no matter the liquid level of the acid tank is high or low during loading, so that the problems of large impact, difficulty in controlling loading time and the like caused by large change of output pressure when the tank is full and the tank bottom of sulfuric acid can be effectively solved; the uncertainty of loading is eliminated, and the safety and stability of the loading process are ensured.

Various corresponding changes and modifications can be made by those skilled in the art according to the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.

Claims (3)

1. A multi-platform acid loading control device comprises a plurality of acid loading platforms, wherein each acid loading platform comprises a sulfuric acid tank, a manual stop valve and an acid conveying tank car; the acid filling platform is characterized by further comprising an upper computer, and the acid filling platform further comprises a pneumatic regulating valve, an electromagnetic flowmeter and a field control box; the sulfuric acid tank is connected with the acid conveying tank car through an acid conveying pipeline; the acid conveying pipeline is provided with the manual stop valve, the pneumatic regulating valve and the electromagnetic flow meter; the field control box comprises a touch screen and a PLC (programmable logic controller), and the PLC is respectively and electrically connected with the touch screen, the pneumatic regulating valve and the electromagnetic flowmeter; the pneumatic regulating valve is used for receiving an output current signal of the PLC controller so as to regulate the opening of the valve, so as to control the flow of sulfuric acid, and transmitting a switch signal of opening and closing the valve in place to the PLC controller; the PLC is electrically connected with a loading starting switch, a loading stopping switch, an emergency stopping button, a test button, an on-position signal switch and an off-position signal switch which are connected in parallel, and the on-position signal switch and the off-position signal switch are used for transmitting a switching signal of the pneumatic regulating valve to the PLC; the PLC is also electrically connected with the ready relay, the loading relay and the alarm output relay which are connected in parallel; a corresponding indicator light is arranged on a cabinet door of the field control box; and the upper computer is in communication connection with the PLC.

2. The multi-platform acid loading control device according to claim 1, wherein the upper computer is in communication connection with the plurality of acid loading platforms through a switch.

3. The multi-platform acid loading control device according to claim 1, wherein an alarm and a power supply are further arranged in the field control box, the alarm is electrically connected with the PLC, and the power supply is electrically connected with the touch screen, the PLC, the alarm, the pneumatic control valve and the electromagnetic flow meter.

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