Dispatching control system for non-flammable and explosive liquid chemicals

Abstract

The utility model discloses a scheduling control system for non-flammable and explosive liquid chemicals, which comprises a storage tank and pipelines connected with the storage tank, the pipelines comprise a plurality of groups of feeding pipelines and a plurality of groups of discharging pipelines, one group of feeding pipelines can be provided with a first electronic valve, and the other group of feeding pipelines can be provided with a second electronic valve. And the first electronic valve and the second electronic valve are electrically connected with the PLC control system. And interlocking logic is adopted in the PLC control system to control the closing relation of the two. The discharging pipeline is further connected with a metering device, a heat exchanger and a plurality of temperature and pressure probes, the discharging pipeline is further provided with a pressurizing main pump and a first backflow pipeline in parallel, and the pressurizing main pump is matched with the first temperature and pressure probes to feed back signals to the PLC control system to enable materials with wrong temperature and pressure to flow back to the storage tank. The material flowing out of the heat exchanger is detected by the second temperature and pressure probe and can flow back to the storage tank through the second backflow pipeline.

Description

Technical Field

[0001] The utility model relates to the fields of electrical automation control and chemical mixing devices, and in particular to a dispatching and control system for non-flammable and explosive liquid chemicals. Background Art

[0002] Currently, in the chemical industry, the production and scheduling management of inorganic chemicals mostly rely on manual operations or rudimentary automated equipment. While this approach can meet production needs to a certain extent, there is still much room for improvement in terms of accuracy, efficiency, and safety. Existing solutions typically include operating procedures that are completed entirely by manpower or the use of some simple automated tools to assist in completing certain specific processes, such as using traditional mechanical valves for flow regulation and manually recording the amount of incoming and outgoing materials. These traditional methods often lead to low work efficiency and low accuracy. Based on the above situation, the existing manual-based management model has significant limitations, especially when dealing with large-scale production. It cannot effectively guarantee the consistency and stability of product quality, and it is difficult to avoid the potential harm to human health caused by long-term exposure to harmful environments.

[0003] Utility model patent publication number CN202815609U discloses an acidic chemical supply control system. This system uses a liquid level sensor to measure the amount of chemicals in the acid barrel and feeds the liquid level signal back to the PLC, enabling stable and safe operation. However, workers still need to refill the acid barrel after it runs out, and the system still suffers from issues such as low automation and incomplete monitoring data. Utility Model Content

[0004] The purpose of the utility model is to reduce the manpower input in the production process of inorganic chemicals, improve production efficiency while ensuring the safety and health of workers, and provide a more refined production model for the scheduling of inorganic chemicals.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0006] A dispatching and control system for non-flammable and explosive liquid chemicals includes a storage tank and a pipeline connected to the storage tank. The pipeline includes a feed pipeline and a discharge pipeline. At least two groups of feed pipelines are provided, one group of feed pipelines is provided with a first electronic valve, and the other group is provided with a second electronic valve. The first electronic valve and the second electronic valve are both electrically connected to a PLC control system. The number of feed pipelines can be set to multiple to adapt to the actual production needs of the factory.

[0007] In order to achieve accurate proportioning of materials in the feed pipe, the technical solution provided by the present invention also includes: the first electronic valve and the second electronic valve adopt interlocking logic to control the closing relationship between the two in the PLC control system.

[0008] To accurately measure the material within the storage tank, the present invention also provides a technical solution: a metering device, including a weighing instrument and flow meter, is connected to the discharge pipe. A third electronic valve is installed in the discharge pipe between the storage tank and the metering device, and the third electronic valve is electrically connected to the PLC control system. After passing through the third electronic valve, the material is metered and output by the metering device, thereby determining the amount of material flowing out of the storage tank.

[0009] In order to achieve precise control of the discharge temperature of the discharge pipe, the technical solution provided by the utility model also includes that the discharge pipe is also connected to a heat exchanger, and the heat exchanger is preferably a plate heat exchanger. The heat exchanger is connected to a water pipe, and constant temperature water flows inside the water pipe. The constant temperature water inside the water pipe exchanges heat with the material in the pipe through the heat exchanger, thereby achieving the regulation of the material temperature.

[0010] A further technical solution includes: a first temperature and pressure probe is installed in the discharge pipe, facing the direction where the material enters the heat exchanger, and a second temperature and pressure probe is installed in the direction where the material exits the heat exchanger. The first and second temperature and pressure probes are electrically connected to a PLC control system. The first temperature and pressure probe detects the temperature and pressure of the material before it passes through the heat exchanger, while the second temperature and pressure probe detects the temperature and pressure of the material after it passes through the heat exchanger. This electrical connection to the PLC control system facilitates readings and system control.

[0011] A further technical solution includes: the metering device is connected in series with a fourth electronic valve, which is electrically connected to a PLC control system. A main pump is also provided in parallel with the third electronic valve and metering device connected in series. In the material outflow direction, the first temperature and pressure probe is further connected to a first return pipe, which is provided with a fifth electronic valve. When the first temperature and pressure probe detects that the temperature and / or pressure are too high or too low, the material is pressurized by the main pump and flows back to the storage tank through the fifth electronic valve.

[0012] A further technical solution also includes: the main pump is an electric main pump, and the electric main pump is electrically connected to the PLC control system to facilitate the automation of the main pumping process.

[0013] To prevent excessive material temperature and / or pressure from impacting subsequent production plans through the discharge pipe, the technical solution also includes a second return pipe, located in the direction away from the heat exchanger and the second temperature and pressure probe, that flows back to the storage tank. The second return pipe is also equipped with a sixth electronic valve electrically connected to the PLC control system. If the second temperature and pressure probe detects excessive material temperature and / or pressure, potentially impacting subsequent production, the PLC control system opens the sixth electronic valve, allowing the material to flow back to the storage tank, mitigating production risks.

[0014] In order to ensure that all materials inside the storage tank can be discharged when the main pump stops working due to low liquid level, the technical solution provided by the utility model is that a pneumatic pump is also arranged in parallel with the main pump. The pneumatic pump is electrically connected to the PLC control system. When the active pump stops working due to low liquid level, the pneumatic pump takes over the work of the active pump and completely discharges the materials from the storage tank.

[0015] The advantages and beneficial effects of the utility model are:

[0016] 1. The PLC control system uses interlocking logic program control for the electronic valves installed in multiple feed pipelines to ensure the safety of equipment during the pipeline feeding process, prevent the equipment from starting up under unsafe or inappropriate conditions, and avoid potential equipment damage, production interruptions, and even personal injury. In addition, the interlocking logic can also optimize the production process, improve energy efficiency and production efficiency, and ensure process continuity and stability.

[0017] 2. Connect the metering device and the electronic valve in series, and connect them in parallel to the discharge pipe to achieve precise control of the discharge volume. In the actual production process where the two do not affect each other, parallel connection reduces unnecessary pipeline settings.

[0018] 3. A first reflux pipe and a heat exchanger are set up, and temperature and pressure probes are respectively provided at the inlet and outlet of the heat exchanger to control the discharge temperature and pressure to remain within a certain range and be adjusted through the heat exchanger. When the discharge temperature and / or pressure are too high, a second reflux pipe is also provided to alleviate possible actual production problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of an embodiment of the utility model

[0020] In the figure: 10-storage tank, 11-first feed pipe, 12-second feed pipe, 13-discharge pipe, 14-first reflux pipe, 15-second reflux pipe, 16-metering device, 17-main pump, 18-heat exchanger, 19-first temperature and pressure probe, 20-second temperature and pressure probe, 21-first electronic valve, 22-second electronic valve, 23-third electronic valve, 24-fourth electronic valve, 25-fifth electronic valve, 26-sixth electronic valve, 27-seventh electronic valve, 28-pneumatic pump. DETAILED DESCRIPTION

[0021] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] Example

[0023] like Figure 1 A dispatching and control system for non-flammable and explosive liquid chemicals includes a storage tank 10 and pipelines connected to the storage tank 10. The pipelines include a first feed pipeline 11, a second feed pipeline 12, and a discharge pipeline 13. The first feed pipeline 11 is equipped with a first electronic valve 21, and the second feed pipeline 12 is equipped with a second electronic valve 22 in series. Both the first electronic valve 21 and the second electronic valve 22 are electrically connected to a programmable logic controller (PLC) control system. It is understood that multiple sets of feed pipelines and corresponding electronic valves can be provided to meet the actual production needs of the factory. The first and second electronic valves 11, 12 are controlled by interlocking logic in the PLC control system. The primary purpose of interlocking logic control is to ensure the safety, reliability, and correct operating sequence of equipment and processes in industrial automation systems. By implementing interlocking logic, equipment can be prevented from starting under unsafe or inappropriate conditions, avoiding potential equipment damage, production interruptions, and even personal injury. Furthermore, interlocking logic can optimize production processes, improve energy efficiency and production efficiency, and ensure process continuity and stability.

[0024] The discharge pipe 13 is also connected to a metering device 16, which can be a weighing instrument, flow meter, or the like. A third electronic valve 23 is installed between the storage tank 10 and the metering device 16. This third electronic valve 23 is electrically connected to the PLC control system. After passing through the third electronic valve 23, the material is precisely metered and controlled by the metering device 16 for output.

[0025] Discharge pipe 13 is also connected to heat exchanger 18, preferably a plate heat exchanger. This heat exchanger is connected to a water pipe through which constant-temperature water flows. The constant-temperature water flowing in the pipe depends on actual production conditions and is typically chilled water or room-temperature water (25°C). When the temperature of the material in storage tank 10 is too high, the constant-temperature water absorbs heat. When the temperature of the material in storage tank 10 is too low, the constant-temperature water releases heat, maintaining the material within the required operating temperature range.

[0026] A first temperature and pressure probe 19 is installed in the discharge pipe 13, facing the direction where the material enters the heat exchanger 18, and a second temperature and pressure probe 20 is installed, facing the direction where the material exits the heat exchanger 18. Both the first and second temperature and pressure probes 19 and 20 are electrically connected to the PLC control system. The first temperature and pressure probe 19 detects the temperature and / or pressure of the material after it exits, while the second temperature and pressure probe detects the temperature and / or pressure of the material after heat exchange.

[0027] The metering device 16 is connected in series with a fourth electronic valve 24, which is electrically connected to the PLC control system. A main pump 17 is also installed in parallel with the third electronic valve 23 and metering device 16. In the material outflow direction, the first temperature and pressure probe 19 is also connected to the first return pipe 14, which is equipped with a fifth electronic valve 25. When the first temperature and pressure probe 19 detects insufficient temperature and / or pressure, the material is pressurized by the main pump 17 and flows back to the storage tank through the fifth electronic valve 25. The main pump is an electric main pump, which is electrically connected to the PLC control system. The main pump 17 is provided mainly to realize the flow of materials from the first reflux pipe 14 back to the storage tank 10. Since the discharge pipe of the storage tank 10 is usually provided at the lower part of the storage tank 10, the discharge can be completed by relying on the hydraulic pressure inside the storage tank 10, while the reflux requires the materials to be sent back from the top of the storage tank. The secondary function of the main pump 17 is to pressurize the materials so that they can flow out of the discharge pipe quickly. When the materials in the storage tank are at a high liquid level, the materials themselves can flow without pressurization by relying on the pressure difference of different liquid levels. However, at a low liquid level, the flow rate is very slow or even does not flow. Therefore, a pneumatic pump 28 is also provided in parallel with the PLC control system to take over the main pump 17 and completely discharge the materials when the main pump 17 cannot work at a low liquid level. It is not difficult to understand that in the process of material reflux, the third electronic valve 23 should be opened and the fourth electronic valve 24 should be closed at the same time. The setting of parallel pipelines can save unnecessary consumption of pipeline materials compared to setting up another pipeline.

[0028] The discharge pipe 13 is also equipped with a second return pipe 15 at a location where the material is away from the heat exchanger 18 and the second temperature and pressure probe 20. This second return pipe 15 flows back to the storage tank 10 and is also equipped with a sixth electronic valve 26 electrically connected to the PLC control system. When the second temperature and pressure probe 20 detects that the material temperature and / or pressure are too high, potentially impacting subsequent production (e.g., excessive pressure causing material overflow, water hammer, tube container rupture, or excessive temperature causing material burning), the PLC control system will open the sixth electronic valve 26, allowing the material to flow back to the storage tank 10, enabling material recovery and reducing production risks. It should also be understood that the second return pipe 15 can also perform the functions of the first return pipe 14 in the event of heat exchanger failure. A seventh electronic valve 27 is also installed at the end of the discharge pipe 13 to seal the discharge pipe 13, thereby achieving the various functions of this embodiment.

[0029] How it works

[0030] First, different materials (such as water and acid, for dilution) flow from the first feed pipe 11 and the second feed pipe 12 through the first electronic valve 21 and the second electronic valve 22 respectively by the PLC control system interlocking program in sequence (as is known, water first and acid later) into the storage tank 10 for storage. When scheduling material discharge, the PLC control program opens the third electronic valve 23, and the fourth electronic valve 24 flows from the discharge pipe 13 through the metering device 16 and the first temperature and pressure probe 19 into the heat exchanger 18 for temperature control management. After the second temperature and pressure probe 20 confirms that it meets the standards, the material continues to be discharged along the discharge pipe 13.

[0031] When the first temperature and pressure probe 19 feeds back the "temperature control" signal to the PLC control system, the heat exchanger 18 in the above pipeline exchanges heat to control the temperature.

[0032] When the first temperature and pressure probe 19 feeds back the "overheat / high pressure" signal to the PLC control system, the fourth and seventh electronic valves are closed, and the fifth electronic valve and the electric main pump 17 are opened. The electric main pump 17 pressurizes the material to flow back to the upper part of the storage tank 10.

[0033] When the first temperature and pressure probe 19 feeds back an "overheat / high pressure" signal to the PLC control system, but after the above process, the second temperature and pressure probe 20 also feeds back an "overheat / high pressure" signal, the material cannot flow out, the fourth, fifth, and seventh electronic valves are closed, the sixth electronic valve and the electric main pump 17 are opened, and the material flows back to the storage tank 10 from the second return pipe 15.

[0034] The functions that the main pump 17 can achieve include: pumping materials to the first and second return pipes, and pumping materials with lower liquid levels out of the discharge pipe. When the main pump 17 cannot achieve its function when the liquid level in the storage tank 10 is too low, the PLC control system switches to the pneumatic pump 28 to replace the main pump to completely deliver the materials in the storage tank 10 to the discharge pipe and empty the storage tank 10.

[0035] The above working principle describes the example of the sequential logic of water and acid for reference only and does not constitute a limitation of the present invention. If the logic of "simultaneously", "intermittently" or "alternatingly" is adopted, it should also be regarded as the scope of protection of the present invention.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A dispatching and control system for non-flammable and explosive liquid chemicals, comprising a storage tank and a pipeline connected to the storage tank, characterized in that: The pipeline includes a feed pipeline and a discharge pipeline. There are at least two groups of feed pipelines, one group of feed pipelines is provided with a first electronic valve, and the other group is provided with a second electronic valve. The first electronic valve and the second electronic valve are both electrically connected to the PLC control system.

2. The dispatching and control system for non-flammable and explosive liquid chemicals according to claim 1 is characterized in that: The discharge pipe is also connected to a metering device. The discharge pipe between the storage tank and the metering device is provided with a third electronic valve, which is electrically connected to the PLC control system. A seventh electronic valve is also provided at the end of the discharge pipe.

3. The dispatching and control system for non-flammable and explosive liquid chemicals according to claim 2, characterized in that: The discharge pipe is also connected to a heat exchanger.

4. The dispatching and control system for non-flammable and explosive liquid chemicals according to claim 3 is characterized in that: A first temperature and pressure probe is provided in the direction where the material enters the heat exchanger in the discharge pipe, and a second temperature and pressure probe is provided in the direction where the material leaves the heat exchanger. The first temperature and pressure probe and the second temperature and pressure probe are electrically connected to the PLC control system.

5. The dispatching and control system for non-flammable and explosive liquid chemicals according to claim 2, characterized in that: The discharge pipe where the metering device is located is connected in series with a fourth electronic valve, which is electrically connected to the PLC control system. A main pump is also arranged in parallel with the third electronic valve and the metering device. In the direction of material outflow, the first temperature and pressure probe is also connected to the first reflux pipe, and the first reflux pipe is provided with a fifth electronic valve.

6. The dispatching and control system for non-flammable and explosive liquid chemicals according to claim 5, characterized in that: The main pump is an electric main pump, and the electric main pump is electrically connected to the PLC control system.

7. The dispatching and control system for non-flammable and explosive liquid chemicals according to claim 4, characterized in that: The discharge pipe is also provided with a second reflux pipe at a position where the material is away from the heat exchanger and away from the second temperature and pressure probe. The second reflux pipe flows back to the storage tank. The second reflux pipe is also provided with a sixth electronic valve electrically connected to the PLC control system.

8. The dispatching and control system for non-flammable and explosive liquid chemicals according to claim 5, characterized in that: A pneumatic pump is also provided in parallel with the main pump, and the pneumatic pump is electrically connected to the PLC control system.

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