Chemical reaction kettle pH online automatic detection system

Abstract

The utility model provides a chemical reaction kettle pH online automatic detection system which comprises a feeding flow meter, a feeding pneumatic switch valve, a feeding pneumatic adjusting valve, a sampling backflow pneumatic switch valve, a sampling feeding pneumatic switch valve, a sampling pipe, a pH meter, a sampling pneumatic diaphragm pump, a compressed air electromagnetic valve and a tap water pneumatic switch valve. All the devices are connected to a DCS system for full-automatic sequential control, and field closed management is achieved. The system solves the problems of inconvenient sampling operation, high temperature and high pressure of a reaction system, corrosion and toxicity of materials, short service life caused by long-term soaking of a pH meter electrode in the materials and the like in a full-automatic manner.

Description

Technical Field

[0001] The utility model relates to the technical field of online pH detection of reactors, in particular to an automatic online pH detection system for chemical reactors. Background Art

[0002] In the fields of medicine, chemicals, food, agriculture, and electricity, especially in the production of most pharmaceutical and chemical products, pH is an extremely important process parameter. It is mainly used to accurately measure the pH value of reaction materials to determine whether the parameters in the production process meet production requirements. The pH meter is an important monitoring instrument for measuring and reflecting the pH value of materials.

[0003] The working principle of the pH meter is to use Bohr's law and electrode principle to monitor the hydrogen ion concentration in the solution, thereby determining the acidity and alkalinity of the solution. By properly using the glass electrode and reference electrode, the pH meter can quickly and accurately measure the acidity and alkalinity of the solution.

[0004] At present, there is no dedicated online monitoring device for the online sampling and detection of pH values in reactors in China. Currently, most chemical companies generally face the problem of pH detection when testing the pH value of materials in reactors. The traditional sampling method requires opening the manhole cover of the reactor, then manually sampling with a hanging bottle, and then testing with a pH meter. This process is not only complicated and tedious, but also time-consuming and labor-intensive. At the same time, for some reactors involving high temperature, high pressure, corrosive, and toxic materials, this sampling method also poses a huge safety hazard and poses a threat to operators.

[0005] Therefore, chemical companies urgently need a safer and more efficient online pH detection system for chemical reactors to improve production efficiency and ensure personnel safety. Utility Model Content

[0006] In view of this, the purpose of the present invention is to provide an online automatic pH detection system for a chemical reactor to solve one or more of the above-mentioned problems in the prior art.

[0007] To achieve the above-mentioned purpose, the utility model provides a chemical reactor pH online automatic detection system, which is arranged on the reactor, and a feed port and an installation port are opened on the top of the reactor, including a sampling system, a sampling system and a control system. The sampling system includes a feed pipe and a feed flow meter, a feed pneumatic regulating valve, and a feed pneumatic switch valve arranged in sequence on the feed pipe. One end of the feed pipe close to the feed flow meter is connected to an external material source, and the other end is connected to the feed port. The sampling system includes a sampling tube, a sampling feed pneumatic switch valve, a pH meter, and a sampling pneumatic diaphragm pump. And a sampling reflux pneumatic switch valve, the sampling tube is arranged at the installation port, the sampling tube includes a sampling port, a sampling outlet and a reflux port, the sampling outlet is connected with the sampling feed pneumatic switch valve, the pH meter, the sampling pneumatic diaphragm pump, the sampling reflux pneumatic switch valve and the reflux port in sequence through a circulation pipeline, the sampling pneumatic diaphragm pump is controlled by a compressed air electromagnetic valve, the control system is electrically connected with the feed flow meter, the feed pneumatic regulating valve, the feed pneumatic switch valve, the sampling reflux pneumatic switch valve, the sampling feed pneumatic switch valve, the pH meter and the compressed air electromagnetic valve.

[0008] In some embodiments, a cleaning pipe is further included, one end of which is connected to an external water source, and the other end of the cleaning pipe is connected to the circulation pipe, and the connection point is located between the sampling and feeding pneumatic switch valve and the pH meter. The cleaning pipe is provided with a tap water pneumatic switch valve, and the control system is electrically connected to the tap water pneumatic switch valve.

[0009] In some embodiments, the pH meter, feed flow meter, and feed pneumatic regulating valve form an interlock to automatically adjust the feed amount to adjust the pH value in the reactor system.

[0010] In some embodiments, the sampling return pneumatic switch valve and the sampling feed pneumatic switch valve are interlocked, and when one valve is opened, the other valve is automatically opened to avoid overpressure in the sampling circulation pipeline caused by one pneumatic valve not being opened.

[0011] In some embodiments, the control system is a DCS system, which is fully automated and the control process is fully closed.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The pH online automatic detection system of the chemical reactor of the utility model is controlled by DCS sequence, which realizes full automation and a fully closed control process, and does not require manual operation, thus preventing personal injury to operators caused by high temperature and high pressure of the system and corrosive and toxic materials.

[0014] The utility model discloses an online automatic pH detection system for a chemical reactor. After the pH test is qualified, the material in the sampling pipeline is pressed back into the reactor with tap water. At this time, the pipeline is filled with tap water, thereby avoiding the problem of shortening the life of the pH meter electrode due to long-term immersion in the material when not in use, thereby greatly increasing the service life of the pH electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic structural diagram of an online automatic pH detection system for a chemical reactor in one embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Example

[0018] like Figure 1 As shown:

[0019] An online pH automatic detection system for a chemical reactor is provided on the reactor, and a feed port and an installation port are provided on the top of the reactor, including a sampling system, a sampling system and a control system. The control system is a DCS system; the sampling system includes a feed pipe and a feed flow meter 1, a feed pneumatic regulating valve 2, and a feed pneumatic switch valve 3 which are sequentially provided on the feed pipe. One end of the feed pipe close to the feed flow meter 1 is connected to an external material source, and the other end is connected to the feed port; the sampling system includes a sampling tube 6, a sampling feed pneumatic switch valve 5, a pH meter 7, a sampling pneumatic diaphragm pump 8, and a sampling reflux pneumatic switch valve 4. The sampling tube is provided at the installation port, and includes a sampling port, a sample outlet, and a reflux port. The sample outlet is sequentially connected to the sampling feed pneumatic switch valve 5, the pH meter 7, the sampling pneumatic diaphragm pump 8, the sampling reflux pneumatic switch valve 4 through a circulation pipe. The reflux port is connected, and the sampling pneumatic diaphragm pump 8 is controlled by a compressed air electromagnetic valve 9; the control system is electrically connected to the feed flow meter 1, the feed pneumatic regulating valve 2, the feed pneumatic switch valve 3, the sampling reflux pneumatic switch valve 4, the sampling feed pneumatic switch valve 5, the pH meter 7 and the compressed air electromagnetic valve 9; wherein, the pH meter 7, the feed flow meter 1 and the feed pneumatic regulating valve 2 and the feed pneumatic switch valve 3 form an interlock, which automatically adjusts the feed amount to adjust the pH value in the reactor system, and the sampling reflux pneumatic switch valve 4 and the sampling feed pneumatic switch valve 5 are interlocked, and when one valve is opened, the other valve is automatically opened to prevent overpressure in the sampling circulation pipeline caused by one pneumatic valve not being opened.

[0020] In order to clean the pH meter in time, a cleaning pipe is also included. One end of the cleaning pipe is connected to an external water source, and the other end of the cleaning pipe is connected to the circulation pipe. The connection point is located between the sampling and feeding pneumatic switch valve 5 and the pH meter 7. The cleaning pipe is provided with a tap water pneumatic switch valve 10, and the tap water pneumatic switch valve 10 is also electrically connected to the control system.

[0021] Working principle:

[0022] When the reactor is adjusting the acid or alkali, the DCS system executes sequential control to open the sampling feed pneumatic switch valve 5, the sampling return pneumatic switch valve 4, and the compressed air solenoid valve 9 to start the sampling pneumatic diaphragm pump 8. At this time, the material is circulated externally in the sampling circulation pipeline, and the pH meter begins to monitor the pH value of the material.

[0023] When the pH value in the system is far from the set value, the feed flowmeter 1 is set to a larger flow rate and interlocked to open the large feed pneumatic regulating valve 2. When the pH value in the system gradually approaches the set value, the feed flowmeter 1 is set to a smaller flow rate and interlocked to open the small feed pneumatic regulating valve 2. When the pH value in the system reaches the set value, the DCS system controls the closure of the feed pneumatic switch valve 3, closes the compressed air electromagnetic valve 9 to stop the sampling pneumatic diaphragm pump 8, closes the sampling feed pneumatic switch valve 5, opens the tap water pneumatic switch valve 10, sets a fixed time to allow the tap water to fill the reflux pipeline, and then controls the closure of the sampling reflux pneumatic switch valve 4 and the tap water pneumatic switch valve 10 to complete the cleaning of the pH meter.

[0024] In summary:

[0025] The pH online automatic detection system of the chemical reactor of the utility model is controlled by DCS sequence, which realizes full automation and a fully closed control process, without manual operation. After the pH test is qualified, the material in the sampling external circulation pipeline is pressed back into the reactor with tap water. At this time, the external circulation pipeline is filled with tap water, avoiding the problem of shortening the life of the pH meter electrode due to long-term immersion in the material when not in use, thereby greatly increasing the service life of the pH electrode.

[0026] Finally, it should be noted that those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements shall fall within the scope of the present invention as claimed. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A chemical reactor pH online automatic detection system is installed in the reactor, and the top of the reactor is provided with a feed port and an installation port, characterized in that: The invention comprises a sampling system, a sampling system and a control system, wherein the sampling system comprises a feeding pipeline and a feeding flow meter (1), a feeding pneumatic regulating valve (2) and a feeding pneumatic switch valve (3) which are sequentially arranged on the feeding pipeline; one end of the feeding pipeline close to the feeding flow meter (1) is connected to an external material source, and the other end is connected to the feeding port; the sampling system comprises a sampling tube (6), a sampling feeding pneumatic switch valve (5), a pH meter (7), a sampling pneumatic diaphragm pump (8) and a sampling reflux pneumatic switch valve (4); the sampling tube is arranged at the installation port; the sampling tube ... The control system is electrically connected to the feed flow meter (1), the feed pneumatic regulating valve (2), the feed pneumatic switch valve (3), the sampling reflux pneumatic switch valve (4), the sampling feed pneumatic switch valve (5), the pH meter (7), and the compressed air electromagnetic valve (9).

2. A chemical reactor pH online automatic detection system according to claim 1, characterized in that: The system further comprises a cleaning pipe, one end of which is connected to an external water source, and the other end of which is connected to the circulation pipe, the connection point being located between the sampling and feeding pneumatic switch valve (5) and the pH meter (7), the cleaning pipe being provided with a tap water pneumatic switch valve (10), and the control system being electrically connected to the tap water pneumatic switch valve (10).

3. A chemical reactor pH online automatic detection system according to claim 1, characterized in that: The pH meter (7), the feed flow meter (1), the feed pneumatic regulating valve (2), and the feed pneumatic switching valve (3) form an interlock.

4. A chemical reactor pH online automatic detection system according to claim 1, characterized in that: The sampling return pneumatic switch valve (4) and the sampling feed pneumatic switch valve (5) are interlocked.

5. A chemical reactor pH online automatic detection system according to claim 1, characterized in that: The control system is a DCS system.

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