A full-automatic online density precision detector special for chlorination process

Abstract

The utility model relates to a technical field of chemical equipment, concretely relates to a full -automatic chlorination process special on -line density precision detector, it contains the instrument platform assembly installed on the reaction kettle, the lateral junction of instrument platform assembly has the compressed gas inlet pipe for the air intake, is equipped with the air intake total valve and pressure reducing valve on compressed gas inlet pipe, is equipped with rotor flowmeter in instrument platform assembly, the bottom end of instrument platform assembly is connected with H and L blow -off pipe, two blow -off pipes all are connected to the reaction kettle, and the bottom end of L blow -off pipe is higher than the bottom end of H blow -off pipe, and the top of instrument platform assembly is equipped with differential pressure transmitter, and L blow -off pipe and H blow -off pipe are equipped with the sampling tube of outer cover, the setting of the sampling tube of the application, ensure the measurement environment stability, guarantee the measurement accuracy, the application directly avoids the direct contact of instrument and reaction liquid, adopts the differential pressure and carries out the indirect measurement, and the service life of equipment is greatly promoted, is applicable to the production of various strong corrosive materials.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a fully automatic online density precision detector for chlorination processes. Background Technology

[0002] In the chlorination process, the density of the reaction liquid inside the reactor needs to be monitored. However, there is currently no dedicated online density monitoring instrument in the domestic chlorination industry. The difficulty lies in:

[0003] 1. The chlorination reaction solution is extremely corrosive, and existing sensors cannot withstand it for long periods of time. Metal sensors cannot even come into direct contact with the material, making direct measurement difficult to achieve.

[0004] 2. Chlorinated liquids are usually highly toxic and have high temperatures, and manual sampling can easily lead to leaks and safety accidents.

[0005] 3. Chlorination is a liquid-gas mixing process, and bubbles can cause large fluctuations and unstable results in density data of traditional real-time detection methods.

[0006] 4. Factories often use manual on-site sampling and hydrometer estimation, which is not accurate enough. If accurate data is needed, samples need to be sent to the laboratory, which is time-consuming and labor-intensive.

[0007] Therefore, there is an urgent need for a dedicated detection device that can automatically control the density of chlorination reaction in real time online, in order to solve the existing technical pain points in this field. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a rationally designed fully automatic online density precision detector specifically for chlorination processes, which can solve the aforementioned deficiencies.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: It includes an instrument panel assembly installed on a reactor. A compressed gas inlet pipe for gas intake is connected to the side of the instrument panel assembly. The compressed gas inlet pipe is equipped with an inlet main valve and a pressure reducing valve. A rotor flow meter is installed inside the instrument panel assembly. An H-blowing pipe and an L-blowing pipe are connected to the bottom of the instrument panel assembly. Both blowing pipes are connected to the reactor, and the bottom of the L-blowing pipe is higher than the bottom of the H-blowing pipe. A differential pressure transmitter is installed on the top of the instrument panel assembly. Sampling tubes are fitted over the L-blowing pipe and the H-blowing pipe.

[0010] Preferably, the sampling tube is cylindrical, with a sample inlet / outlet port at its bottom for the flow of the sampling liquid, and the bottom of the H-blowing tube is higher than the sample inlet / outlet port.

[0011] Preferably, the differential pressure transmitter is a two-port transmitter, with a high-pressure port and a low-pressure port. The high-pressure port is connected to the H-blowing pipe, and the low-pressure port is connected to the L-blowing pipe.

[0012] Preferably, a three-way pipe is connected between the bottom of the instrument panel assembly and the reactor. Both the H-pipe and the L-pipe are inserted into the three-way pipe. One end of the three-way pipe is oriented to the side and is connected to a pneumatic balance valve. The pneumatic balance valve is connected to the reactor through a balance pipe.

[0013] Preferably, a three-way valve is connected between the differential pressure transmitter and the two air blowing pipes.

[0014] Preferably, a temperature transmitter is installed on the reactor.

[0015] Preferably, the detector is controlled by a PLC, and the differential pressure transmitter and temperature transmitter are both connected to the PLC.

[0016] The beneficial effects of this utility model after adopting the above structure are:

[0017] 1. This application solves the problem that density is difficult to measure directly when there are air bubbles and turbulence in the reaction liquid inside the reactor. By setting up a sampling tube, the measurement environment is ensured to be stable and the measurement accuracy is guaranteed.

[0018] 2. This application directly avoids direct contact between the instrument and the reaction liquid, and uses differential pressure for indirect measurement, which greatly extends the service life of the equipment and is suitable for the production of various highly corrosive materials.

[0019] 3. This application achieves automated control through electronic measurement and PLC connection, eliminating the need for repeated manual measurement, reducing labor costs, and lowering personnel safety risks. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Instrument panel assembly; 2. Main air inlet valve; 3. Pressure reducing valve; 4. Compressed air inlet pipe; 5. H-blowing pipe; 6. L-blowing pipe; 7. Sampling pipe; 8. Sample inlet / outlet port; 9. Differential pressure transmitter; 10. Three-way valve; 11. Rotor flow meter; 12. Three-way pipe; 13. Pneumatic balance valve; 14. Balance pipe; 15. Temperature transmitter. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] See Figure 1 As shown, it includes an instrument panel assembly 1 made of corrosion-resistant plastic, mounted on the reactor. A compressed gas inlet pipe 4 for introducing carrier gas is connected to the side of the instrument panel assembly 1. The compressed gas inlet pipe 4 is equipped with an inlet main valve 2 and a pressure reducing valve 3 to control the flow of carrier gas. The pressure reducing valve 3 stabilizes the carrier gas, reducing the high-pressure carrier gas from high pressure to the required pressure value and forming an isolation to ensure that pressure fluctuations in the inlet or changes in downstream flow do not affect the outlet pressure. The instrument panel assembly 1 contains a rotor flowmeter 11 with a regulating valve. The rotor flowmeter 11 is glass-type, further stabilizing the incoming airflow. An H-blowing pipe 5 and an L-blowing pipe are connected to the bottom of the instrument panel assembly 1. The two air blowing pipes 6 and 6 are connected to the reactor, with the bottom of the L-blowing pipe 6 being higher than the bottom of the H-blowing pipe 5. The top of the instrument panel assembly 1 is equipped with a differential pressure transmitter 9, which is a two-port transmitter with a high-pressure port and a low-pressure port. The high-pressure port is connected to the H-blowing pipe 5, and the low-pressure port is connected to the L-blowing pipe 6. After the fluid enters through the port, the pressure element inside the differential pressure transmitter 9 obtains the pressure difference between the two ends and converts it into a measurable physical quantity, which can then transmit the data. The sampling pipe 7 and the two air blowing pipes are all made of corrosion-resistant plastic pipes, which prevents damage caused by direct contact and also reduces the replacement cost even if they age or corrode over a long period of time.

[0025] The L-blowing pipe 6 and H-blowing pipe 5 are fitted with a sampling pipe 7. The sampling pipe 7 is cylindrical and has a sample inlet / outlet port 8 at its bottom for the flow of the sampling liquid. The bottom of the H-blowing pipe 5 is higher than the sample inlet / outlet port 8. During the detection process, chlorine gas needs to be introduced into the reactor and some gas may be generated during the reaction. Therefore, the reaction liquid will be in an unstable gas-liquid mixed state. The presence of a large number of bubbles and the kinetic energy of bubble bursting will make it impossible to measure directly. After using the sampling pipe 7, the carrier gas is separated from the external liquid, and the sample inlet / outlet port 8 is set at the bottom, which makes the aperture smaller to prevent liquid from entering. A relatively stable environment is formed inside the sampling pipe 7.

[0026] A three-way pipe 12 is connected between the bottom of the instrument panel assembly 1 and the reactor. The H-blowing pipe 5 and the L-blowing pipe 6 are both inserted into the three-way pipe 12. One end of the three-way pipe 12 is set to the side and is connected to a pneumatic balance valve 13. The pneumatic balance valve 13 is connected to the reactor through a balance pipe 14. So when it is opened, the carrier gas at the top of the three-way valve 10 can be discharged back into the reactor from the balance pipe 14 under pressure.

[0027] A three-way valve 10 is connected between the differential pressure transmitter 9 and the two air blowing pipes below to calibrate the value of the differential pressure transmitter 9; the main air inlet valve 2, pressure reducing valve 3, differential pressure transmitter 9, three-way valve 10, pneumatic balance valve 13, balance pipe and temperature transmitter are all made of corrosion-resistant stainless steel.

[0028] A temperature transmitter 15 is installed on the reactor to facilitate the acquisition of real-time temperature inside the reactor. The detector is controlled by a PLC, which includes a PLC main board and a display screen. The differential pressure transmitter 9 and the temperature transmitter 15 are both connected to the PLC main board for data parsing and data uploading. The differential pressure transmitter 9 acquires the differential pressure value, while the temperature transmitter 15 can acquire the real-time temperature to compensate for the measured value and reduce the temperature-induced changes in the measured value.

[0029] In use, the sampling tube 7 is inserted into the liquid surface, and the inner H blowing tube 5 and L blowing tube 6 are inserted into the liquid surface to a depth of not less than 30 cm. Carrier gas is introduced, the rotor flow meter 11 is turned on, the gas volume is adjusted, the flow rate is controlled at 20-100 ml / min, and the gas pressure on both sides is kept equal. After the carrier gas enters the two blowing tubes from the flow meter, it is discharged from the mouth of the two tubes respectively. Since the two blowing tubes are inserted to different depths, the liquid pressure they receive will also be different, and the gas pressure inside the blowing tubes will also be different. When the pressure is higher than this value, the gas is discharged, thus forming a pressure difference between the two blowing tubes. The differential pressure transmitter 9 detects this pressure difference value.

[0030] According to Archimedes' principle, P = ρgh, which means that the static pressure of a liquid is proportional to its density and depth. The height difference between the bottom ends of the two air pipes is a constant value, i.e., h is a fixed value and g is a constant. Therefore, the liquid density can be directly calculated from the differential pressure value obtained by the differential pressure transmitter 9. The effect of temperature on the liquid density can be calculated by combining the physical properties of the liquid. Temperature compensation is performed during the calculation to calculate the actual density value, and then the data is uploaded.

[0031] After the test is completed, the carrier gas is discharged from the balance tube 14. After the pneumatic balance valve 13 is closed, the carrier gas pressure accumulates in the sampling tube 7 and the pressure gradually increases. Since the gas density is less than that of the liquid, the gas accumulates at the top of the sampling tube 7 and, with the increase in pressure, gradually pushes the liquid downward until it is completely discharged from the sample inlet / outlet port 8. At this time, since the two blowing tubes are no longer immersed in the liquid, the pressure difference between them drops to 0, indicating that the liquid has dropped to leave the two tube ports. The pneumatic balance valve 13 is opened again, and the gas in the sampling tube 7 is discharged from the pneumatic balance valve 13. The reaction liquid re-enters. After the pressure in the sampling tube 7 and the value of the differential pressure transmitter 9 stabilize, new density data is uploaded again. The above measurement operation is repeated to achieve continuous detection.

[0032] The installation, connection, or setting methods of the components not detailed above are all common mechanical methods, and the specific structure, model, and coefficient indicators of all their components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be elaborated further.

[0033] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A fully automatic online density precision detector for chlorination processes, comprising an instrument panel assembly (1) mounted on a reactor, characterized in that: The instrument panel assembly (1) is connected to a compressed air inlet pipe (4) for air intake on the side. The compressed air inlet pipe (4) is equipped with an air intake main valve (2) and a pressure reducing valve (3). The instrument panel assembly (1) is equipped with a rotor flow meter (11). The bottom of the instrument panel assembly (1) is connected to an H-blowing pipe (5) and an L-blowing pipe (6). Both blowing pipes are connected to the reactor, and the bottom of the L-blowing pipe (6) is higher than the bottom of the H-blowing pipe (5). The top of the instrument panel assembly (1) is equipped with a differential pressure transmitter (9). The L-blowing pipe (6) and the H-blowing pipe (5) are fitted with sampling pipes (7).

2. The fully automatic online density precision detector for chlorination process according to claim 1, characterized in that: The sampling tube (7) is cylindrical, with a sample inlet / outlet hole (8) at its bottom for the flow of the sampling liquid, and the bottom of the H-blowing tube (5) is higher than the sample inlet / outlet hole (8).

3. The fully automatic online density precision detector for chlorination process according to claim 2, characterized in that: The differential pressure transmitter (9) is a two-port transmitter. The two ports are a high-pressure port and a low-pressure port. The high-pressure port is connected to the H-blowing pipe (5), and the low-pressure port is connected to the L-blowing pipe (6).

4. The fully automatic online density precision detector for chlorination process according to claim 3, characterized in that: The bottom of the instrument panel assembly (1) is connected to the reactor via a three-way pipe (12). The H-blowing pipe (5) and the L-blowing pipe (6) are both installed inside the three-way pipe (12). One end of the three-way pipe (12) is set to the side and is connected to a pneumatic balance valve (13). The pneumatic balance valve (13) is connected to the reactor via a balance pipe (14).

5. The fully automatic online density precision detector for chlorination process according to claim 3, characterized in that: A three-way valve (10) is connected between the differential pressure transmitter (9) and the H-blowing pipe (5) and L-blowing pipe (6).

6. The fully automatic online density precision detector for chlorination process according to claim 1, characterized in that: A temperature transmitter (15) is installed on the reactor.

7. The fully automatic online density precision detector for chlorination process according to claim 6, characterized in that: The detector is controlled by a PLC, and the differential pressure transmitter (9) and temperature transmitter (15) are both connected to the PLC.

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