System for cleaning primary and secondary dryers of polytetrahydrofuran device

Abstract

The utility model relates to the field of cleaning systems, particularly discloses a system for cleaning primary and secondary dryers of a polytetrahydrofuran device, and solves the technical problem that workers need to enter equipment for cleaning in the process of cleaning the dryers at present. The bottom of the neutralization reaction tank is connected with a reaction tank bottom pump through a first pipeline, and the reaction tank bottom pump is connected to the top of the neutralization reaction tank through a second pipeline; the feeding end of the first-stage dryer is communicated with the second pipeline through a third pipeline, the discharging end of the first-stage dryer is connected with a first dryer bottom pump through a fourth pipeline, the first dryer bottom pump is connected with a first heat exchanger through a fifth pipeline, and the first heat exchanger is connected with the feeding end of the first-stage dryer through a sixth pipeline; the feeding end of the secondary dryer is communicated with a fifth pipeline through a seventh pipeline, the discharging end of the secondary dryer is connected to a second dryer bottom pump through an eighth pipeline, the second dryer bottom pump is connected with a second heat exchanger through a ninth pipeline, the second heat exchanger is connected with the feeding end of the secondary dryer through a tenth pipeline, manual operation is replaced, and efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cleaning system technical field, specifically, relate to a system of cleaning polytetrahydrofuran device one two stage drier. BACKGROUND

[0002] In the production process of polytetrahydrofuran (PTMEG), the primary and secondary dryers play a crucial role. Their main task is to remove moisture from the PTMEG material, ensuring the purity and quality of the final product. The primary dryer receives PTMEG material from the neutralization reactor, which contains a certain amount of water, methanol, and a small amount of salt impurities. To effectively remove these impurities, the primary dryer operates at a temperature of 140°C and a vacuum of 70 mmHg, which allows most of the water and methanol to be vaporized. Through this process, under normal operating conditions, the primary dryer can reduce the moisture content in the PTMEG material from a high initial level to about 1500 ppm. After preliminary water removal by the primary dryer, the PTMEG material enters the secondary dryer for further drying. The secondary dryer operates under more stringent conditions, at the same temperature of 140°C, but the vacuum is increased to 4 mmHg, which further reduces the moisture content in the material to below 100 ppm. This two-step drying process ensures that the PTMEG product meets high standards of purity. Due to the presence of salt substances in the PTMEG material, scaling occurs inside the primary and secondary dryers during long-term continuous operation. These deposits not only hinder heat transfer efficiency, but also reduce the effective volume of the equipment, thereby seriously affecting the water removal effect of the dryer, leading to unstable product quality and possibly increasing energy consumption.

[0003] To address the problem of dryer scaling, the current measures are to open the manhole of the equipment after the material is discharged and the air replacement is qualified, and then manually enter the inside of the dryer for cleaning work. However, entering a confined space such as the inside of the dryer for cleaning work poses serious safety risks such as suffocation and falling from a height for workers; manual cleaning is a labor-intensive task that requires a large amount of manpower, and workers working in high-temperature environments are prone to fatigue; the entire cleaning process is time-consuming, affecting the continuity and efficiency of production; traditional cleaning methods may generate wastewater and other pollutants, causing environmental burden. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a system for cleaning the primary and secondary dryers of a polytetrahydrofuran device, solving the technical problems of high risk, high workload, and low work efficiency in the current process of cleaning the primary and secondary dryers of a polytetrahydrofuran device.

[0005] The utility model provides a system of cleaning polytetrahydrofuran device one two stage drier, include: neutralization reaction tank, the bottom passes through first pipeline connection reaction tank bottom pump, reaction tank bottom pump passes through second pipeline connection in neutralization reaction tank top, first stage drier, the feed end passes through third pipeline intercommunication in second pipeline, the discharge end passes through fourth pipeline connection in first drier bottom pump, first drier bottom pump passes through fifth pipeline connection first heat exchanger, first heat exchanger passes through sixth pipeline connection first stage drier feed end in, second stage drier, the feed end passes through seventh pipeline intercommunication in fifth pipeline, the discharge end passes through eighth pipeline connection in second drier bottom pump, second drier bottom pump passes through ninth pipeline connection second heat exchanger, second heat exchanger passes through tenth pipeline connection second stage drier feed end.

[0006] According to one embodiment of the utility model, the neutralization reaction tank is internally provided with a liquid level standard line located at 85% of the overall height.

[0007] According to one embodiment of the utility model, the neutralization reaction tank is provided with a stirring device.

[0008] According to one embodiment of the utility model, the second pipeline, the fifth pipeline and the ninth pipeline are further provided with pressure gauges.

[0009] According to one embodiment of the utility model, the reaction tank bottom pump, the first drier bottom pump and the second drier bottom pump are further provided with filters at the inlets.

[0010] According to one embodiment of the utility model, the first stage drier and the second stage drier are provided with vibrators at the bottoms.

[0011] According to one embodiment of the utility model, the neutralization reaction tank is provided with a condensate supplementing pipe.

[0012] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0013] The utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 1 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 2 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 3 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 4 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 5 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 6 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 7 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 8 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 9 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 10 of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will introduce the drawing needed to be used in the embodiment briefly, should understand, the following drawing only shows some embodiments of the utility model, therefore should not be regarded as the limited scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0015] Figure 1 The utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 1 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 2 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 3 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 4 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 5 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 6 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 7 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 8 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 9 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 10 of the utility model.

[0016] Figure 2 The utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 1 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 2 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 3 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 4 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 5 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 6 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 7 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 8 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 9 of the utility model, and the utility model discloses a cleaning polytetrahydrofuran device one two -stage drier's system's structure schematic diagram is provided for the embodiment 10 of the utility model.

[0017] Icon:

[0018] 100, neutralization reaction tank;

[0019] 200, primary drier;

[0020] 300, secondary drier;

[0021] 400, condensate supplement pipe;

[0022] 510, first pipe; 520, second pipe; 530, third pipe; 540, fourth pipe; 550, fifth pipe; 560, sixth pipe; 570, seventh pipe; 580, eighth pipe; 590, ninth pipe; 500, tenth pipe;

[0023] 610, reactor bottom pump; 620, first dryer bottom pump; 630, second dryer bottom pump;

[0024] 710, first heat exchanger; 720, second heat exchanger;

[0025] 800, pressure gauge;

[0026] 900, filter;

[0027] 1000, vibrator. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Embodiment 1

[0030] The embodiments of the present application provide a system for cleaning a two-stage dryer 300 of a polytetrahydrofuran device, so as to

[0031] Please refer to Figure 1The utility model embodiment provides a kind of system of cleaning polytetrahydrofuran device primary and secondary drier 300, comprising: neutralization reaction tank 100, bottom is connected reaction tank bottom pump 610 by first pipeline 510, reaction tank bottom pump 610 is used to extract from tank with the cleaning fluid prepared, the reaction tank bottom pump 610 is connected to the neutralization reaction tank 100 top by second pipeline 520, forms a circulation path, to ensure that cleaning fluid is fully mixed;Primary drier 200, feed end is connected to the second pipeline 520 by third pipeline 530, and the cleaning fluid is introduced into primary drier 200 to carry out preliminary cleaning, and the discharge end is connected to first drier bottom pump 620 by fourth pipeline 540, the first drier bottom pump 620 is connected first heat exchanger 710 by fifth pipeline 550, and the cleaning fluid is sent into first heat exchanger 710 temperature rising treatment by fifth pipeline 550, the first heat exchanger 710 is connected the feed end of primary drier 200 by sixth pipeline 560, and complete once complete cleaning cycle;Secondary drier 300, feed end is connected to the fifth pipeline 550 by seventh pipeline 570, and the cleaning fluid is introduced into secondary drier 300, and secondary drier 300 is further cleaned, and the discharge end is connected to second drier bottom pump 630 by eighth pipeline 580, the second drier bottom pump 630 is connected second heat exchanger 720 by ninth pipeline 590, and the cleaning fluid is sent into second heat exchanger 720 further temperature rising treatment by ninth pipeline 590, the second heat exchanger 720 is connected the feed end of secondary drier 300 by tenth pipeline 500, and cleaning cycle is carried out again.

[0032] In the embodiment, the neutralization reaction tank 100 is internally provided with a liquid level standard line located at 85% of the overall height, to ensure that the condensate does not overflow when being added, and to reserve sufficient space for subsequent chemical reactions. In the embodiment, the neutralization reaction tank 100 is internally provided with a liquid level gauge, which is electrically connected to a central processing device, and the central processing device is a single-chip microcomputer.

[0033] In the embodiment, the neutralization reaction tank 100 is provided with a stirring device, so that the chemical substances such as citric acid and corrosion inhibitor are fully dissolved, to improve the cleaning effect. The stirring device comprises a stirring motor, a stirring shaft and a primary stirring paddle connected in sequence, and the stirring paddle is arranged at the bottom of the neutralization reaction tank 100.

[0034] In the embodiment, the second pipeline 520, the fifth pipeline 550 and the ninth pipeline 590 are further provided with a pressure gauge 800, to monitor the pressure in the pipelines in real time, prevent overpressure risk, and ensure the safety of system operation.

[0035] In the embodiment, the filter 900 is arranged at the inlet of the reaction tank bottom pump 610, the first dryer bottom pump 620 and the second dryer bottom pump 630, so as to effectively intercept large-particle impurities, protect the normal work of the pump body and prevent the impurities from damaging the pump or affecting the cleaning effect.

[0036] In the embodiment, the neutralization reaction tank 100 is provided with the condensate supplement pipe 400, so as to facilitate the regular addition of appropriate condensate into the tank and maintain a suitable liquid level.

[0037] In the embodiment, the second dryer 300 is connected with the wastewater collection tank at the discharge end.

[0038] In the embodiment, the valves are arranged on the first pipeline 510, the second pipeline 520, the third pipeline 530, the fourth pipeline 540, the fifth pipeline 550, the sixth pipeline 560, the seventh pipeline 570, the eighth pipeline 580, the ninth pipeline 590 and the tenth pipeline 500.

[0039] The use process of the cleaning system of the two-stage dryer 300 of the polytetrahydrofuran device in the embodiment 1 will be described in detail as follows.

[0040] Step 1, the neutralization reaction tank 100 is added with condensate to 85% liquid level, and citric acid and corrosion inhibitor are added.

[0041] Step 2, the reaction tank bottom pump 610 is started to send the cleaning water from the neutralization reaction tank 100 to the first-stage dryer 200 and the second-stage dryer 300.

[0042] Step 3, after the liquid levels of the first-stage dryer 200 and the second-stage dryer 300 are established, the pumps are started to circulate, and the condensate supplement liquid level is connected, and the water supply is stopped when the liquid level of the first-stage dryer 200 is 25% and the liquid level of the second-stage dryer 300 is 50%.

[0043] Step 4, the first-stage dryer 200 and the second-stage dryer 300 are put into use to be heated by the heater, and the water temperature is controlled to be 90-95℃.

[0044] Step 5, after the water temperature of the first-stage dryer 200 is increased to 95℃, the first-stage dryer 200 supplies water to the second-stage dryer 300 for 30 minutes to flush the feeding pipeline of the second-stage dryer 300, and the second-stage dryer 300 is boiled and washed for 2 hours and then discharged; the waste liquid is discharged to the wastewater collection tank and then discharged after being neutralized by alkali.

[0045] Step 6, the first-stage dryer 200 and the second-stage dryer 300 are re-supplied with liquid to 25% and 50% respectively, and rinsed for 3 times.

[0046] Step 7, after the cleaning is qualified, the residual liquid of the first-stage dryer 200 and the second-stage dryer 300 is discharged.

[0047] Embodiment 2

[0048] The embodiment of the utility model provides a system for cleaning the primary and secondary dryers 300 of the polytetrahydrofuran device, to replace the manual cleaning operation in the prior art.

[0049] Please refer to Figure 2 The system for cleaning the primary and secondary dryers 300 of the polytetrahydrofuran device provided in the embodiment 2 of the utility model is only different from the embodiment 1 in that, in the embodiment, the primary dryer 200 and the secondary dryer 300 are provided with the vibrator 1000 at the bottom, to further increase the cleaning effect through mechanical vibration.

[0050] The embodiment of the utility model has at least the following advantages:

[0051] In the cleaning process, the condensate is first added to the neutralization reaction tank, then an appropriate amount of citric acid and corrosion inhibitor are added to the neutralization reaction tank, the citric acid as an effective acidic cleaning agent can effectively remove the oxides and other deposits on the surface of the metal, and the corrosion inhibitor is used to protect the equipment from corrosion and prolong its service life, then the mixed cleaning liquid is extracted from the neutralization reaction tank by the reaction tank bottom pump and accurately delivered to the primary and secondary dryers, to ensure that the cleaning liquid is uniformly distributed in the entire dryer to achieve full coverage and deep cleaning; the utility model adopts the heater built in the primary and secondary dryers to heat the cleaning liquid. The appropriately elevated temperature can accelerate the chemical reaction rate, so that the cleaning liquid can more effectively dissolve and remove stubborn dirt. In addition, mechanical vibration is applied through the vibrator, which not only helps to loosen the solid particles attached to the walls of the dryers, but also promotes the flow of the liquid, further improving the cleaning efficiency. The vibration action and the heat treatment work together in the dryers, greatly enhancing the cleaning effect; compared with the traditional manual cleaning method, the utility model reduces the demand for manpower, reduces the risk of operation errors caused by human factors, and avoids the possibility of direct contact of workers with harmful substances, thereby effectively protecting the safety and health of personnel.

[0052] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A system for cleaning the primary and secondary dryers of a polytetrahydrofuran (PTF) device, characterized in that, include: The neutralization reaction vessel has a bottom pump connected to its bottom via a first pipe, and the bottom pump is connected to the top of the neutralization reaction vessel via a second pipe. The primary dryer has its feed end connected to the second pipe via a third pipe, and its discharge end connected to the first dryer bottom pump via a fourth pipe. The first dryer bottom pump is connected to the first heat exchanger via a fifth pipe, and the first heat exchanger is connected to the feed end of the primary dryer via a sixth pipe. The secondary dryer has its feed end connected to the fifth pipe via the seventh pipe, and its discharge end connected to the second dryer bottom pump via the eighth pipe. The second dryer bottom pump is connected to the second heat exchanger via the ninth pipe, and the second heat exchanger is connected to the feed end of the secondary dryer via the tenth pipe.

2. The system for cleaning the primary and secondary dryers of a polytetrahydrofuran unit according to claim 1, characterized in that, The neutralization reaction vessel is equipped with a liquid level standard line located at 85% of its overall height.

3. The system for cleaning the primary and secondary dryers of a polytetrahydrofuran unit according to claim 1, characterized in that, The neutralization reaction vessel is equipped with a stirring device.

4. The system for cleaning the primary and secondary dryers of a polytetrahydrofuran unit according to claim 1, characterized in that, The second pipe, the fifth pipe, and the ninth pipe are also equipped with pressure gauges.

5. The system for cleaning the primary and secondary dryers of a polytetrahydrofuran unit according to claim 1, characterized in that, The inlet of the reaction tank bottom pump, the first dryer bottom pump, and the second dryer bottom pump is also equipped with a filter.

6. The system for cleaning the primary and secondary dryers of a polytetrahydrofuran unit according to claim 1, characterized in that, The primary dryer and the secondary dryer are equipped with vibrators at their bottoms.

7. The system for cleaning the primary and secondary dryers of a polytetrahydrofuran apparatus according to any one of claims 1 to 6, characterized in that, The neutralization reaction vessel is equipped with a condensate replenishment pipe.

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