Constant-temperature and constant-flow conveying system for formaldehyde liquid

Abstract

The utility model relates to a formaldehyde liquid constant-temperature and constant-flow conveying system, and belongs to the technical field of chemical production. Comprising a formaldehyde storage tank, a conveying pipeline is connected to a discharging port in the bottom of the formaldehyde storage tank, a magnetic driving pump, a three-way connector, an electric control valve and a first remote transmission flowmeter are installed at the end, close to the formaldehyde storage tank, of the conveying pipeline, and a backflow pipe is installed on a bypass connector of the three-way connector; the other end of the return pipe is connected to the upper part of the formaldehyde storage tank, a second remote flow meter and a pipeline heater are mounted on the return pipe, and a temperature sensor is mounted at the bottom in the formaldehyde storage tank. The formaldehyde storage tank has the advantages that the temperature of formaldehyde liquid in the formaldehyde storage tank is prevented from being affected by the outside, it is guaranteed that the formaldehyde liquid in the formaldehyde storage tank is constant in temperature, and it can be guaranteed that the constant-temperature formaldehyde liquid is output outwards through the magnetic force driving pump and the conveying pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of formaldehyde liquid constant-temperature constant-flow conveying systems, belong to chemical production technical field. BACKGROUND

[0002] Formaldehyde is an important chemical raw material, has extensive application in teaching scientific research, organic synthesis and bactericidal preservation etc. field. Formaldehyde solution spontaneous polymerization can seriously affect the use of formaldehyde, sometimes even can cause economic loss. In practical application, the storage condition of formaldehyde solution should be paid attention to, to avoid the occurrence of polymerization phenomenon.

[0003] The utility model with patent No.202420612168.7 discloses a formaldehyde storage tank, including main body mechanism, auxiliary mechanism and support mechanism, the auxiliary mechanism is located at the left end of main body mechanism, the support mechanism is located at the lower end of main body mechanism, the main body mechanism includes storage tank main body, charging cover and detection device, the charging cover is movably installed at the upper end of storage tank main body, the detection device is fixedly installed at the left side of charging cover.

[0004] The above patent can realize the storage and conveying function of formaldehyde liquid, but the current technology is not comprehensive, and has the following disadvantages: the low temperature of formaldehyde liquid can cause polymeric reaction to produce white precipitate, which adheres to the wall and bottom of formaldehyde tank. If not cleaned in time, the increase of precipitate will affect the quality of formaldehyde, corrode the tank body, shorten its service life, waste resources and inconvenient to clean, cause loss to enterprises, affect benefits and increase labor cost.

[0005] To solve one of the above problems, a formaldehyde liquid constant-temperature constant-flow conveying system is urgently needed. UTILITY MODEL CONTENTS

[0006] According to the above deficiencies in the prior art, the technical problem to be solved by the utility model is how to ensure the constant temperature of formaldehyde liquid in the formaldehyde storage tank, which can ensure the output of constant-temperature formaldehyde liquid by the magnetic drive pump and the conveying pipeline. Therefore, a formaldehyde liquid constant-temperature constant-flow conveying system is provided.

[0007] The formaldehyde liquid constant-temperature constant-flow conveying system, comprising a formaldehyde storage tank, a conveying pipeline connected to the discharge port at the bottom of the formaldehyde storage tank, a magnetic drive pump, a three-way joint, an electric control valve and a first remote flowmeter installed at one end of the conveying pipeline close to the formaldehyde storage tank, characterized in that: a return pipe is installed on the bypass interface of the three-way joint, the other end of the return pipe is connected to the upper part of the formaldehyde storage tank, a second remote flowmeter and a pipeline heater are installed on the return pipe, and a temperature sensor is installed at the bottom of the formaldehyde storage tank.

[0008] After the magnetic drive pump is turned on, the magnetic drive pump transports the formaldehyde liquid in the formaldehyde storage tank to the outside through the delivery pipeline. When passing through the delivery pipeline, it is split into two paths. One path flows through the first remote flow meter. The first remote flow meter transmits the flow data of the pipeline to the first controller in real time. The first controller controls the opening of the electric control valve to keep the flow of the pipeline where the first remote flow meter is located constant.

[0009] Another stream flows through the pipe heater, and after being heated by the pipe heater, it flows back into the formaldehyde storage tank to ensure that the formaldehyde liquid in the formaldehyde storage tank is kept at a constant temperature.

[0010] Preferably, the pipe heater includes a heat exchange box and a circuitous heat exchange tube. The heat exchange box is provided with an upper partition and a lower partition, which divide the heat exchange box into a pump mounting chamber, a heat exchange chamber, and a heating chamber. The upper and lower partitions are both penetrated by the heat exchange tube, with one end of the heat exchange tube in the pump mounting chamber and the other end in the heating chamber. A circulating pump is installed in the pump mounting chamber. The inlet of the circulating pump is connected to the heat exchange tube, and the outlet of the circulating pump is connected to the circulating main pipe. The other end of the circulating main pipe extends through the upper and lower partitions into the heating chamber. An electric heating rod is installed in the heating chamber. One end of the heat exchange box is provided with a left connecting flange that communicates with the heat exchange chamber, and the other end of the heat exchange box is provided with a right connecting flange that communicates with the heat exchange chamber.

[0011] After the electric heating rod is turned on, the heat exchange medium in the heating chamber can be heated. After the circulation pump is turned on, the heat exchange medium can circulate in the heat exchange tube. The formaldehyde liquid enters the heat exchange chamber from the right connecting flange and is heated by the heat exchange tube. Then it flows out through the left connecting flange and flows back to the formaldehyde storage tank to ensure that the temperature of the formaldehyde liquid in the formaldehyde storage tank is constant.

[0012] Preferably, an inspection port is installed on the outer wall of the heat exchange box to facilitate maintenance of the circulating pump. A liquid injection hole connected to the heating chamber is also installed on the outer wall of the heat exchange box for replenishing the heat exchange medium.

[0013] Preferably, it further includes a first controller, wherein the first remote flow meter, the second remote flow meter, and the temperature sensor are electrically connected to the signal input terminal of the first controller, and the magnetic drive pump, the electric control valve, and the electric heating rod are all electrically connected to the signal output terminal of the first controller.

[0014] The second remote flow meter transmits the flow data of the pipeline to the first controller in real time. The first controller controls the electric heating rod to increase its power, improve the heat exchange effect, and ensure that the temperature rise of the formaldehyde liquid in the return pipe is not affected by the flow rate.

[0015] Preferably, the heat exchange medium filling the heating chamber is water or heat transfer oil, and the heat exchange tube is a copper tube.

[0016] Preferably, the conveying pipeline is covered with an insulation layer.

[0017] Preferably, the first remote flow meter and the second remote flow meter have the same structure, both being remote metal rotor flow meters.

[0018] Preferably, the first controller is a PLC, DCS controller, or microcontroller.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The formaldehyde liquid constant temperature and constant flow delivery system of this utility model can increase the output flow rate of the magnetic drive pump by changing the pump speed when the room temperature is low and the temperature sensor detects a downward trend in the temperature of the formaldehyde liquid in the formaldehyde storage tank. This application can increase the flow rate of the pipeline where the first remote flow meter is located while ensuring that the flow rate of the pipeline where the first remote flow meter is located remains unchanged, and improve the heat exchange effect of the pipeline heater. The heated formaldehyde liquid flows back to the formaldehyde storage tank, avoiding the temperature of the formaldehyde liquid in the formaldehyde storage tank from being affected by the outside environment, ensuring that the formaldehyde liquid in the formaldehyde storage tank is kept at a constant temperature, and thus ensuring that the formaldehyde liquid at a constant temperature is output to the outside through the magnetic drive pump and delivery pipeline.

[0021] The formaldehyde liquid constant temperature and constant flow delivery system of this invention can quantitatively deliver and continuously and stably provide reactants (formaldehyde), keeping the reaction rate constant, which is beneficial to obtaining high-quality products.

[0022] The formaldehyde liquid constant temperature and constant flow delivery system of this utility model, wherein the second remote flow meter transmits the flow data of the pipeline to the first controller in real time, and the first controller controls the electric heating rod to increase the power, improve the heat exchange effect, and ensure that the temperature rise of the formaldehyde liquid in the return pipe is not affected by the flow rate.

[0023] The formaldehyde liquid constant temperature and constant flow delivery system of this utility model has an inspection port installed on the outer wall of the heat exchange box for easy maintenance of the circulating pump, and an injection hole connected to the heating chamber installed on the outer wall of the heat exchange box for replenishing the heat exchange medium. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the pipe heater of this utility model;

[0027] Figure 3 This is a structural diagram of the heat exchanger tube.

[0028] In the diagram: 1. Formaldehyde storage tank; 2. Magnetic drive pump; 3. Delivery pipeline; 4. T-joint; 5. Return pipe; 6. Electric control valve; 7. First remote flow meter; 8. Second remote flow meter; 9. Pipeline heater; 10. Temperature sensor; 11. First controller; 12. Heat exchange box; 13. Upper partition; 14. Lower partition; 15. Left connecting flange; 16. Right connecting flange; 17. Circulation pump; 18. Electric heating rod; 19. Heat exchange tube; 20. Main circulation pipe; 21. Inspection port. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings: The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0030] Example 1, such as Figures 1-2 As shown, the formaldehyde liquid constant temperature and constant flow conveying system includes a formaldehyde storage tank 1. A conveying pipe 3 is connected to the discharge port at the bottom of the formaldehyde storage tank 1. A magnetic drive pump 2, a three-way connector 4, an electric control valve 6, and a first remote flow meter 7 are installed at one end of the conveying pipe 3 near the formaldehyde storage tank 1. A return pipe 5 is installed on the bypass interface of the three-way connector 4. The other end of the return pipe 5 is connected to the upper part of the formaldehyde storage tank 1. A second remote flow meter 8 and a pipe heater 9 are installed on the return pipe 5. A temperature sensor 10 is installed at the bottom of the formaldehyde storage tank 1.

[0031] After the magnetic drive pump 2 is turned on, the magnetic drive pump 2 transports the formaldehyde liquid in the formaldehyde storage tank 1 to the outside through the delivery pipe 3. When passing through the delivery pipe 3, it is split into two paths. One path flows through the first remote flow meter 7. The first remote flow meter 7 transmits the flow data of the pipeline to the first controller 11 in real time. The first controller 11 controls the opening of the electric control valve 6, so as to maintain the constant flow of the pipeline where the first remote flow meter 7 is located.

[0032] Another stream flows through the pipe heater 9, and after being heated by the pipe heater 9, it flows back to the formaldehyde storage tank 1 to ensure that the formaldehyde liquid in the formaldehyde storage tank 1 is kept at a constant temperature.

[0033] When the room temperature is low, and the temperature sensor 10 detects a decreasing trend in the temperature of the formaldehyde liquid in the formaldehyde storage tank 1, the pump speed can be changed to increase the output flow rate of the magnetically driven pump 2. This application ensures that the flow rate in the pipeline where the first remote flow meter 7 is located remains constant while increasing the flow rate in the pipeline where the second remote flow meter 8 is located, and also improves the heat exchange effect of the pipeline heater 9. The heated formaldehyde liquid flows back into the formaldehyde storage tank 1, preventing the temperature of the formaldehyde liquid in the tank from being affected by external factors, thus maintaining a constant temperature. This also ensures that a constant-temperature formaldehyde liquid is output through the magnetically driven pump 2 and the delivery pipeline 3. This keeps the formaldehyde in the tank at a constant temperature of 30°C, effectively preventing formaldehyde accumulation.

[0034] Example 2, as Figures 1-2 As shown, the formaldehyde liquid constant temperature and constant flow conveying system includes a formaldehyde storage tank 1. A conveying pipe 3 is connected to the discharge port at the bottom of the formaldehyde storage tank 1. A magnetic drive pump 2, a three-way connector 4, an electric control valve 6, and a first remote flow meter 7 are installed at one end of the conveying pipe 3 near the formaldehyde storage tank 1. A return pipe 5 is installed on the bypass interface of the three-way connector 4. The other end of the return pipe 5 is connected to the upper part of the formaldehyde storage tank 1. A second remote flow meter 8 and a pipe heater 9 are installed on the return pipe 5. A temperature sensor 10 is installed at the bottom of the formaldehyde storage tank 1.

[0035] Furthermore, referring to Figure 2 and Figure 3 The pipe heater 9 includes a heat exchange box 12 and a circuitous heat exchange tube 19. The heat exchange box 12 is equipped with an upper partition 13 and a lower partition 14, which divide the heat exchange box 12 into a pump mounting chamber, a heat exchange chamber, and a heating chamber. Both the upper partition 13 and the lower partition 14 are penetrated by the heat exchange tube 19, with one end of the heat exchange tube 19 in the pump mounting chamber and the other end in the heating chamber. The pump mounting chamber is equipped with... There is a circulating pump 17, the inlet of which is connected to the heat exchange tube 19, and the outlet of which is connected to the circulating main pipe 20. The other end of the circulating main pipe 20 extends into the heating chamber after passing through the upper partition 13 and the lower partition 14. An electric heating rod 18 is installed in the heating chamber. One end of the heat exchange box 12 is provided with a left connecting flange 15 that communicates with the heat exchange chamber, and the other end of the heat exchange box 12 is provided with a right connecting flange 16 that communicates with the heat exchange chamber.

[0036] After the electric heating rod 18 is turned on, the heat exchange medium in the heating chamber can be heated. After the circulation pump 17 is turned on, the heat exchange medium can circulate in the heat exchange tube 19. The formaldehyde liquid enters the heat exchange chamber from the right connecting flange 16 and is heated by the heat exchange tube 19. Then it flows out through the left connecting flange 15 and flows back to the formaldehyde storage tank 1 to ensure that the temperature of the formaldehyde liquid in the formaldehyde storage tank 1 is constant.

[0037] Furthermore, an inspection port 21 is installed on the outer wall of the heat exchange box 12 to facilitate the maintenance of the circulating pump 17. A liquid injection hole connected to the heating chamber is also installed on the outer wall of the heat exchange box 12 for replenishing the heat exchange medium.

[0038] Furthermore, it also includes a first controller 11, the first remote flow meter 7, the second remote flow meter 8, and the temperature sensor 10 are electrically connected to the signal input terminal of the first controller 11, and the magnetic drive pump 2, the electric control valve 6, and the electric heating rod 18 are all electrically connected to the signal output terminal of the first controller 11.

[0039] The second remote flow meter 8 transmits the flow data of the pipeline to the first controller 11 in real time. The first controller 11 controls the electric heating rod 18 to increase its power, improve the heat exchange effect, and ensure that the temperature rise of the formaldehyde liquid in the return pipe 5 is not affected by the flow rate.

[0040] Furthermore, the heat exchange medium filled in the heating chamber is water or heat transfer oil, and the heat exchange tube 19 is a copper tube.

[0041] Furthermore, the conveying pipe 3 is covered with an insulation layer.

[0042] Furthermore, the first remote flow meter 7 and the second remote flow meter 8 have the same structure, both being remote metal rotor flow meters.

[0043] Furthermore, the first controller 11 is a PLC controller.

[0044] In this embodiment, the modification of the prior art lies in the hardware part, and the computer program involved is a simple program whose functions can be easily implemented by those skilled in the art using existing computer program development platforms and well-known programming methods.

[0045] In this article, the remote flow meter and controller are only used in a simple way, and no improvement is involved in the methods or procedures.

[0046] The formaldehyde liquid constant temperature and constant flow delivery system of this utility model can increase the output flow rate of the magnetic drive pump by changing the pump speed when the room temperature is low and the temperature sensor detects a downward trend in the temperature of the formaldehyde liquid in the formaldehyde storage tank. This application can increase the flow rate of the pipeline where the first remote flow meter is located while ensuring that the flow rate of the pipeline where the first remote flow meter is located remains unchanged, and improve the heat exchange effect of the pipeline heater. The heated formaldehyde liquid flows back to the formaldehyde storage tank, avoiding the temperature of the formaldehyde liquid in the formaldehyde storage tank from being affected by the outside environment, ensuring that the formaldehyde liquid in the formaldehyde storage tank is kept at a constant temperature, and thus ensuring that the formaldehyde liquid at a constant temperature is output to the outside through the magnetic drive pump and delivery pipeline.

[0047] The formaldehyde liquid constant temperature and constant flow delivery system of this utility model, wherein the second remote flow meter transmits the flow data of the pipeline to the first controller in real time, and the first controller controls the electric heating rod to increase the power, improve the heat exchange effect, and ensure that the temperature rise of the formaldehyde liquid in the return pipe is not affected by the flow rate.

[0048] The formaldehyde liquid constant temperature and constant flow delivery system of this utility model has an inspection port installed on the outer wall of the heat exchange box for easy maintenance of the circulating pump, and an injection hole connected to the heating chamber installed on the outer wall of the heat exchange box for replenishing the heat exchange medium.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0050] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A formaldehyde liquid constant temperature and constant flow conveying system, comprising a formaldehyde storage tank, wherein a conveying pipe is connected to the outlet at the bottom of the formaldehyde storage tank, and a magnetic drive pump, a three-way connector, an electric control valve, and a first remote flow meter are installed at one end of the conveying pipe near the formaldehyde storage tank, characterized in that: A reflux pipe is installed on the bypass interface of the tee connector. The other end of the reflux pipe is connected to the upper part of the formaldehyde storage tank. A second remote flow meter and a pipe heater are installed on the reflux pipe. A temperature sensor is installed at the bottom of the formaldehyde storage tank.

2. The formaldehyde liquid constant temperature and constant flow delivery system according to claim 1, characterized in that, The pipe heater includes a heat exchange box and a circuitous heat exchange tube. The heat exchange box is equipped with an upper partition and a lower partition, which divide the heat exchange box into a pump mounting chamber, a heat exchange chamber, and a heating chamber. Both the upper and lower partitions are penetrated by the heat exchange tube, with one end of the heat exchange tube in the pump mounting chamber and the other end in the heating chamber. A circulating pump is installed in the pump mounting chamber. The inlet of the circulating pump is connected to the heat exchange tube, and the outlet of the circulating pump is connected to the circulating main pipe. The other end of the circulating main pipe extends through the upper and lower partitions into the heating chamber. An electric heating rod is installed in the heating chamber. One end of the heat exchange box is equipped with a left connecting flange that communicates with the heat exchange chamber, and the other end of the heat exchange box is equipped with a right connecting flange that communicates with the heat exchange chamber.

3. The formaldehyde liquid constant temperature and constant flow delivery system according to claim 2, characterized in that, The heat exchanger box has an inspection port installed on its outer wall.

4. The formaldehyde liquid constant temperature and constant flow delivery system according to claim 3, characterized in that, It also includes a first controller, wherein the first remote flow meter, the second remote flow meter, and the temperature sensor are electrically connected to the signal input terminal of the first controller, and the magnetic drive pump, the electric control valve, and the electric heating rod are all electrically connected to the signal output terminal of the first controller.

5. The formaldehyde liquid constant temperature and constant flow delivery system according to claim 4, characterized in that, The heat exchange medium filled in the heating chamber is water or heat transfer oil, and the heat exchange tube is a copper tube.

6. The formaldehyde liquid constant temperature and constant flow delivery system according to claim 5, characterized in that, The conveying pipeline is covered with an insulation layer.

7. The formaldehyde liquid constant temperature and constant flow delivery system according to claim 6, characterized in that, The first and second remote flow meters have the same structure; both are remote metal rotor flow meters.

8. The formaldehyde liquid constant temperature and constant flow delivery system according to claim 7, characterized in that, The first controller is a PLC, DCS controller, or microcontroller.

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