CN110542345A - cleaning device and cleaning method for acetaldehyde scaling heat exchanger - Google Patents
cleaning device and cleaning method for acetaldehyde scaling heat exchanger Download PDFInfo
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- CN110542345A CN110542345A CN201910854773.9A CN201910854773A CN110542345A CN 110542345 A CN110542345 A CN 110542345A CN 201910854773 A CN201910854773 A CN 201910854773A CN 110542345 A CN110542345 A CN 110542345A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 63
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000243 solution Substances 0.000 claims abstract description 105
- 238000011010 flushing procedure Methods 0.000 claims abstract description 58
- 238000005406 washing Methods 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 239000010865 sewage Substances 0.000 claims abstract description 26
- 239000002904 solvent Substances 0.000 claims abstract description 25
- 239000012459 cleaning agent Substances 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000002798 polar solvent Substances 0.000 claims description 16
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 12
- 238000010926 purge Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000002791 soaking Methods 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 6
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- 239000005956 Metaldehyde Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- GKKDCARASOJPNG-UHFFFAOYSA-N metaldehyde Chemical compound CC1OC(C)OC(C)OC(C)O1 GKKDCARASOJPNG-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011086 high cleaning Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Cleaning In General (AREA)
Abstract
the invention discloses a cleaning device and a cleaning method for an acetaldehyde scaling heat exchanger, wherein a cleaning agent injection device is communicated with a water washing pipeline, the cleaning agent injection device and the water washing pipeline are converged and then communicated with an inlet end of the heat exchanger, a cleaning agent recovery device is communicated with an outlet end of the heat exchanger, and the cleaning method comprises the following steps: pressure relief, material return, valve closing A, B; emptying the heat exchanger; establishing a liquid level in the solvent tank, opening a valve C, and starting a flushing pump; opening valve D, E, F, establishing liquid level in the heat exchanger, soaking; opening valve G, H, stopping solution tank liquid level, and closing valve H; until the color of the washing solution is clear and bright; the liquid level of the solution tank is higher than 50%, the valve is opened L, M, and the solution is discharged by an external discharge pump; the heat exchanger washing solution is emptied and washed by water; the sewage is sent to a sewage discharge pipeline; the valve A, B is opened, the heat exchanger can be reused, the cleaning under pressure can be realized, the overhaul cost is reduced, the operation flow is simple, the cleaning effect is good, the construction period is short, the long-term use of the heat exchange equipment can be ensured, and the service life of the equipment is prolonged.
Description
Technical Field
The invention relates to a cleaning device and a cleaning method thereof, in particular to a cleaning device and a cleaning method of an acetaldehyde scaling heat exchanger, and belongs to the field of petrochemical industry.
Background
In the existing peroxidation chemical process, acetaldehyde byproducts are often generated, the acetaldehyde byproducts are enriched in the process flow, and deposit and scale in areas with poor circulation, such as a tower kettle, a reboiler and the like, so that the thermal efficiency is influenced, pipelines can be even blocked, and process risks and even safety risks are caused, so that the areas need to be cleaned, and the reaction mechanism is that acetaldehyde is polymerized to generate solid metaldehyde:
metaldehyde is a main body of scale formation, is accompanied by other side reaction impurities to cause flow blockage, and is represented by low hardness of scale formation substances, a porous structure and a needle-shaped crystalline state observed by sampling.
the traditional cleaning mode comprises mechanical cleaning, high-pressure water gun flushing and open fire scorching, but the traditional cleaning mode respectively has the following defects:
1. cleaning by a mechanical method: generally, manual methods such as scraping and brushing are adopted, deposits such as water scales and the like cannot be thoroughly removed, time and labor are wasted, the working efficiency is low, the longer the length of a scaling area is, the greater the difficulty is, and the cleaning effect is not ideal;
2. Flushing by a high-pressure water gun: stubborn dirt generated in water using equipment cannot be removed, and high-pressure water has personal danger to operators during construction;
3. burning with open fire: the whole of the scaling area is heated and combusted, acetaldehyde is consumed by utilizing the combustibility of the acetaldehyde, the method has limited effect on narrow space in the tube bundle, and the service life of high-pressure pipeline equipment can be influenced by frequent scorching operation.
disclosure of Invention
In order to solve the problems in the prior art, the invention provides the cleaning device for the acetaldehyde scaling heat exchanger, which has the technical characteristics of capability of cleaning under pressure, good cleaning effect, high cleaning speed, low maintenance cost, cost saving, high working efficiency, short construction period, prolonged service life of equipment and the like.
The invention also aims to provide a cleaning method of the cleaning device of the acetaldehyde scaling heat exchanger, which is used for solving the problems, the cleaning pump is used for conveying a polar solvent to circularly clean the heat exchanger, so that acetaldehyde scales in the heat exchanger are dissolved, the acetaldehyde scales attached to the wall of the heat exchanger tube can be effectively removed, the product quality is improved, and the cleaning device has the advantages of convenience, simplicity, easy operation, good cleaning effect, easy separation and recovery and the like, and has higher safety.
In order to achieve the purpose, the invention is realized by the following technical scheme:
The invention relates to a cleaning device for an acetaldehyde scaling heat exchanger, which comprises a heat exchanger, wherein the inlet end of the heat exchanger is connected with an upper end process flow pipeline with a valve A, the outlet end of the heat exchanger is communicated with a lower end process flow pipeline with a valve B, and the cleaning device is characterized in that: still include cleaner injection apparatus, washing liquid recovery unit, water washing pipeline, the pipeline is washed in cleaner injection apparatus intercommunication water, cleaner injection apparatus, water washing pipeline collect back and heat exchanger entrance point intercommunication, washing liquid recovery unit and heat exchanger exit end intercommunication, the heat exchanger exit end still communicates there is the sewage pipes.
As an improvement, cleaner injection apparatus includes the washer pump and has the solvent groove of liquid level indication, solvent tank bottom and washer pump entrance point intercommunication, the washer pump exit end is established the extension respectively and is had a pipeline, No. two pipelines, be connected with valve D, valve E, valve F in order on No. two pipelines, and No. two terminal intercommunication heat exchanger entrance points of pipeline, be equipped with valve C on the pipeline, and a pipeline end-to-end connection is at the feed end of solvent groove 13, the water washing pipeline intercommunication is between valve E, valve F.
As an improvement, the cleaning liquid recovery device comprises a solution tank with a liquid level indicator, a third pipeline is communicated between an inlet end of the solution tank and an outlet end of a heat exchanger, a valve G and a valve H are sequentially connected to the third pipeline from an outlet end of the heat exchanger, a valve L, a filter, a valve M and an external drainage pump are sequentially communicated with the bottom of the solution tank, and the external drainage pump is communicated with a solvent refining pipeline.
as a refinement, the water flush line includes a valve I in communication with a water source, the valve I communicating between valves E, F.
as an improvement, a fourth pipeline with a valve K is communicated with a second pipeline between the valve E and the valve F, and the fourth pipeline is communicated with a nitrogen source.
as an improvement, a valve J is connected to the sewage discharge pipeline.
the invention relates to a cleaning method of a cleaning device of a heat exchanger scaling by utilizing acetaldehyde, which comprises the following steps:
Step 1): releasing pressure and returning materials of the upper-end technological process pipeline, and closing a valve A on the upper-end technological process pipeline and a valve B on the upper-end technological process pipeline;
step 2): after the pressure in the heat exchanger is discharged to zero through the valve J, the valve J is closed;
Step 3): introducing a polar solvent into the solvent tank, establishing a 50% liquid level, opening a valve C, and starting a flushing pump;
Step 4): sequentially opening a valve D2, a valve E3 and a valve F4, establishing liquid level in the heat exchanger, stopping flushing the pump 12 when the heat exchanger is completely soaked in the polar solvent, closing the valve E3, and keeping the heat exchanger soaked for at least 2 hours to dissolve scales to obtain a flushing solution;
Step 5): then opening the valve G5 and the valve H6 in sequence, discharging the flushing solution to the solution tank 16 by utilizing the residual pressure in the heat exchanger, discharging the flushing solution in the heat exchanger completely when the liquid level of the solution tank 16 does not rise any more, and closing the valve H6;
step 6): sampling in the solution tank 16, observing the flushing solution, if the color of the flushing solution is clear and bright, indicating that the scaling substances are completely dissolved, entering the step 8), and otherwise, entering the step 7);
Step 7): repeating the steps 4) to 6) until the color of the washing solution is clear and bright, which indicates that the scaling substances are dissolved completely;
step 8): after the liquid level of the solution tank 16 is higher than 50%, opening a valve L10 and a valve M11, starting an external discharge pump 19, filtering a flushing solution by a filter 18, and delivering the flushing solution to the external discharge pump 19 for refining;
Step 9): when the washing solution in the heat exchanger is emptied and all the washing solution is sent to the solution tank 16, opening a valve I7, introducing water for washing, monitoring and sampling the washing water in the solvent tank 16 in real time until the COD of the washing water is less than 700PPM and the washing is qualified, closing a valve I7, and stopping the water washing;
Step 10): opening valve J8 to send residual sewage to sewage draining pipeline;
step 11): closing valves F4 and G5, and respectively disconnecting valves F4 and E3 and G5 and H6;
Step 12): and opening the valve A21 and the valve B22, replacing the padding by an upper process flow pipeline, and putting the heat exchanger into use.
as an improvement, in the step 6), when the valve G5 and the valve H6 are opened to discharge the solution to a solution tank by utilizing the residual pressure in the heat exchanger, the purging nitrogen valve K9 is opened to accelerate the discharge rate of the solution; and 10) opening a valve J8 to send the residual sewage to a sewage discharge pipeline, and opening a purging nitrogen valve K9 to purge so as to completely discharge residual liquid in the heat exchanger.
as a modification, when clogging of the filter 18 occurs in step 8), the valves L10 and M11 are closed, and the filter 18 is cut out and cleaned.
as an improvement, the cleaning agent is propylene oxide;
The valve C1, the valve D2, the valve F4, the valve G5, the valve L10 and the valve M11 are all stop valves, and the valve E3, the valve H6, the valve I7, the valve J8 and the valve K9 are all ball valves.
Has the advantages that:
1) the device can be cleaned under pressure without opening the device, so that a large amount of emptying and replacement operations are not needed, and the maintenance cost is greatly reduced;
2) The cleaning is carried out according to the process, so that the using amount of the stock solution of the cleaning agent can be obviously saved, the cleaning effect is good, the relevant standard requirements can be met, the raw materials and the cost are saved, the working efficiency is high, the cleaning speed is high, the construction period is short, the equipment device is simplified, the long-term use of the heat exchange equipment can be ensured, and the service life of the equipment can be greatly prolonged;
3) The advantages of the epoxypropane cleaned heat exchanger are obvious, after the pipeline is cleaned, the heat exchanger is reused, the heat efficiency is obviously improved, and the outlet temperature of the heat exchanger is obviously improved; meanwhile, because the closed flushing is adopted, the steps of system replacement and surrender are reduced, and the operation cost is greatly saved.
Drawings
FIG. 1 is a schematic block diagram of the process of the present invention.
Detailed Description
the present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following examples.
The invention relates to a cleaning device for an acetaldehyde scaling heat exchanger, which comprises a heat exchanger, wherein an inlet end of the heat exchanger is connected with an upper end process flow pipeline provided with a valve A21, the upper end process flow pipeline is used for conveying materials into the heat exchanger, the materials in the cleaning device are mainly crude propylene (comprising propylene, acetaldehyde and propane), an outlet end of the heat exchanger is communicated with a lower end process flow pipeline provided with a valve B22, the materials enter the lower end process flow through the lower end process flow pipeline after heat exchange in the heat exchanger, the cleaning agent injection device, a cleaning agent recovery device and a water washing pipeline are creatively arranged in the cleaning device, the cleaning agent injection device is communicated with the water washing pipeline, the cleaning agent injection device and the water washing pipeline are converged and communicated with the inlet end of the heat exchanger, a polar solvent is filled in the cleaning agent injection device, and the polar solvent and scaling (, the cleaning solution recovery device is communicated with the outlet end of the heat exchanger, the outlet end of the heat exchanger is also communicated with a sewage discharge pipeline, the cleaning solution recovery device is used for recovering the cleaning solution, the sewage discharge pipeline is used for discharging sewage after water washing in the heat exchanger, the polar solvent is preferably propylene oxide, and ethylene oxide with similar properties can also be selected as the washing solvent.
As an improved embodiment mode, the cleaning agent injection device comprises a washing pump 12 and a solvent tank 13 with a liquid level indicator, the liquid level indicator is preferably a traditional glass tube liquid level meter, the bottom of the solvent tank 12 is communicated with the inlet end of the washing pump 12, the outlet end of the washing pump 12 is respectively provided with a first pipeline 14 and a second pipeline 15 in an extending mode, the second pipeline 15 is sequentially connected with a valve D2, a valve E3 and a valve F4, the tail end of the second pipeline 15 is communicated with the inlet end of a heat exchanger, the first pipeline 14 is provided with a valve C1, the tail end of the first pipeline 14 is connected with the feeding end of the solvent tank 13, and the water washing pipeline is communicated between the valve E3 and the valve F4;
the operation process comprises the following steps: introducing polar solvent into the solvent tank 13 and establishing a 50% liquid level, opening the valve C1, and starting the washing pump 12; and sequentially opening the valve D2, the valve E3 and the valve F4, establishing a liquid level in the heat exchanger, stopping flushing the pump 12 when the heat exchanger is completely soaked in the polar solvent, closing the valve E3, and keeping the heat exchanger soaked for at least 2 hours to dissolve the scales to obtain a flushing solution.
as an improved embodiment mode, the cleaning liquid recovery device comprises a solution tank 16 with a liquid level indicator, a third pipeline 17 is communicated between an inlet end of the solution tank 16 and an outlet end of a heat exchanger, a valve G5 and a valve H6 are sequentially connected on the third pipeline 17 from the outlet end of the heat exchanger, a valve L10, a filter 18, a valve M11 and an external drainage pump 19 are sequentially communicated at the bottom of the solution tank 16, and the external drainage pump 19 is communicated with a solvent refining pipeline;
The operation process comprises the following steps: introducing polar solvent into the solvent tank 13 and establishing a 50% liquid level, opening the valve C1, and starting the washing pump 12; sequentially opening a valve D2, a valve E3 and a valve F4, establishing liquid level in the heat exchanger, stopping flushing the pump 12 when the heat exchanger is completely soaked in the polar solvent, closing the valve E3, keeping the heat exchanger soaked for at least 2 hours to dissolve scales to obtain a flushing solution, sequentially opening a valve G5 and a valve H6, discharging the flushing solution to the solution tank 16 by utilizing the residual pressure in the heat exchanger, and when the liquid level of the solution tank 16 does not rise any more, completely discharging the flushing solution in the heat exchanger and closing a valve H6; sampling in the solution tank 16, observing the flushing solution, if the color of the flushing solution is clear and bright, indicating that the scaling substances are completely dissolved, opening a valve L10 and a valve M11 after the liquid level of the solution tank 16 is higher than 50%, starting an external discharge pump 19, filtering the flushing solution through a filter 18, and then externally feeding the external discharge pump 19 for refining, and if the sampling in the solution tank 16 is found, finding that the color of the flushing solution is not clear and bright; repeatedly and sequentially opening the valve D2, the valve E3 and the valve F4 to establish liquid level in the heat exchanger, stopping the washing pump 12 when the heat exchanger is completely soaked in the polar solvent, closing the valve E3, keeping the heat exchanger soaked for at least 2 hours to dissolve scales to obtain a washing solution, then sequentially opening the valve G5 and the valve H6, discharging the washing solution to the solution tank 16 by using residual pressure in the heat exchanger, discharging the washing solution in the heat exchanger completely when the liquid level of the solution tank 16 does not rise any more, closing the valve H6, sampling in the solution tank 16, observing the washing solution until the color of the washing solution is clear and bright, indicating that the scales are dissolved completely, then opening the valve L10 and the valve M11 after the liquid level of the solution tank 16 is higher than 50%, starting the external discharge pump 19, filtering the washing solution through the external discharge filter 18, and externally sending the washing solution to the external discharge filter 19 for refining; when the flushing solution in the heat exchanger is emptied and all the flushing solution is sent to the solution tank 16, a water flushing pipeline is opened, water is introduced for flushing, the flushing water in the solvent tank 16 is monitored and sampled in real time until the COD of the flushing water is less than 700PPM and the flushing is qualified, the water flushing is stopped, the valves F4 and G5 are closed, the valves F4 and E3 and the valves G5 and H6 are respectively detached and separated, the valve A21 and the valve B22 are opened, the padding is replaced by the upper-end process flow pipeline, and the heat exchanger is put into use.
as a modified embodiment mode, the water flushing pipeline comprises a valve I7 communicated with a water source, a valve I7 is communicated between a valve E3 and a valve F4, when the flushing solution in the heat exchanger is emptied and all the flushing solution is sent to the solution tank 16, the valve I7 is opened, water is introduced for flushing, the flushing water in the solvent tank 16 is monitored and sampled in real time until the COD of the flushing water is less than 700PPM and the flushing is qualified, and the valve I7 is closed, and the water flushing is stopped.
as a modified embodiment mode, a fourth pipeline 20 with a valve K9 is communicated with a second pipeline 15 between the valve E3 and the valve F4, the fourth pipeline 20 is communicated with a nitrogen source, and when the valve G5 and the valve H6 are opened to discharge the solution to a solution tank by utilizing the residual pressure in the heat exchanger, the valve K9 for purging nitrogen can be opened to accelerate the discharge rate of the solution.
as an improved embodiment mode, a valve J8 is connected on the sewage discharge pipeline, after the water flushing is stopped, a valve J8 is opened, the residual sewage is sent to the sewage discharge pipeline, when a valve J8 is opened to send the residual sewage to the sewage discharge pipeline, a purging nitrogen valve K9 is opened for purging, so that residual liquid in the heat exchanger can be discharged completely.
The invention relates to a cleaning method of a cleaning device of a heat exchanger scaled by acetaldehyde, which mainly utilizes the physicochemical reaction of polar solvent propylene oxide on an acetaldehyde polymer, and is matched with a specific pipeline flow connection mode, a cleaning step and cleaning time, so that the acetaldehyde polymer attached in the heat exchanger can be effectively removed, the heat transfer efficiency of the heat exchanger is recovered, and the cleaning method has the advantages of convenience, simplicity, easy operation and the like, and simultaneously has higher safety, and the specific cleaning method comprises the following steps:
step 1): releasing pressure and returning materials of the upper-end technological process pipeline, closing a valve A21 on the upper-end technological process pipeline and a valve B22 on the upper-end technological process pipeline, and sealing the interior of the heat exchanger;
Step 2): after the pressure in the heat exchanger was discharged to zero through valve J8, valve J8 was closed;
Step 3): introducing a polar solvent into a solvent tank 13 and establishing a 50% liquid level, opening a valve C1, starting a flushing pump 12, wherein a cleaning agent is preferably propylene oxide, ethylene oxide with similar properties can be used as the flushing solvent instead of propylene oxide, propylene oxide is low-boiling flammable liquid with ether smell, propylene oxide is a flammable and explosive chemical, vapor of the propylene oxide can be decomposed, the propylene oxide is non-corrosive to metal and has active chemical properties and has an effect on certain rubbers and plastics, attention is paid to the selection of a gasket and a valve, the gasket and the valve are partially miscible with water, the polarization rate is 10-24cm3 is 6.15, and acetaldehyde polymers can be effectively dissolved. The dissolution mechanism is as follows:
Decomposition reaction under the action of oxygen ions:
(CH3CHO)4 is dissolved in epoxy strong polar solution, and sample experiment observation shows that acetaldehyde scale substance blocks (scale in a heat exchanger of the application) are rapidly dissolved in the propylene oxide solution and can reach the volume of 1: 1, the required washing effect can be completely achieved by dissolution;
step 4): sequentially opening a valve D2, a valve E3 and a valve F4, establishing liquid level in the heat exchanger, stopping flushing the pump 12 when the heat exchanger is completely soaked in the polar solvent, closing the valve E3, and keeping the heat exchanger soaked for at least 2 hours to dissolve scales to obtain a flushing solution, wherein the time can be adjusted according to specific needs, and the timing unit is hour;
step 5): then opening the valve G5 and the valve H6 in sequence, discharging the flushing solution to the solution tank 16 by utilizing the residual pressure in the heat exchanger, discharging the flushing solution in the heat exchanger completely when the liquid level of the solution tank 16 does not rise any more, and closing the valve H6;
Step 6): sampling in the solution tank 16, observing the flushing solution, if the color of the flushing solution is clear and bright, indicating that the scaling substances are completely dissolved, entering the step 8), and otherwise, entering the step 7); when the valve G5 and the valve H6 are opened to discharge the solution to the solution tank by utilizing the residual pressure in the heat exchanger, the purging nitrogen valve K9 is opened to accelerate the discharge rate of the solution;
Step 7): repeating the steps 4) to 6) until the color of the washing solution is clear and bright, which indicates that the scaling substances are dissolved completely;
step 8): after the liquid level of the solution tank 16 is higher than 50%, opening a valve L10 and a valve M11, starting an external discharge pump 19, filtering a flushing solution by a filter 18, and delivering the flushing solution to the external discharge pump 19 for refining; when the clogging of the filter 18 occurs in step 8, the valves L10 and M11 are closed, and the filter 18 is cut out and cleaned.
Step 9): when the washing solution in the heat exchanger is emptied and all the washing solution is sent to the solution tank 16, opening a valve I7, introducing water for washing, monitoring and sampling the washing water in the solvent tank 16 in real time until the COD of the washing water is less than 700PPM and the washing is qualified, closing a valve I7, and stopping the water washing;
Step 10): opening a valve J8, sending the residual sewage to a sewage discharge pipeline, and opening a purging nitrogen valve K9 for purging when opening a valve J8 to send the residual sewage to the sewage discharge pipeline so as to completely discharge residual liquid in the heat exchanger;
step 11): closing a valve F4 and a valve G5, and respectively disassembling and separating a valve F4 from a valve E3 and a valve G5 from a valve H6, wherein the valves C1, D2, F4, G5, L10 and M11 are stop valves, and the valves E3, H6, I7, J8 and K9 are ball valves, as shown in FIG. 1, when the valve F4 is disassembled from the valve E3, the valve F4 is in a closed state and still communicated with an upper-end process flow pipeline, so that the valve E3 is connected with the valve E3 at a later stage to realize the installation of the cleaning agent injection device, and when the valve G5 is separated from the valve H6, the valve G5 is in a closed state and still communicated with a lower-end process flow pipeline, so that the valve H34 is connected with the valve H6 at a later stage to realize the installation of the cleaning agent recovery device;
step 12): the valve A21 and the valve B22 are opened, the upper process flow pipeline replaces the padding, and the heat exchanger is put into use again.
finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (10)
1. the utility model provides an acetaldehyde scale deposit heat exchanger belt cleaning device, includes the heat exchanger, the heat exchanger entrance point is connected with the upper end process flow pipeline that has valve A (21), the heat exchanger exit end intercommunication has the lower extreme process flow pipeline that has valve B (22), its characterized in that: still include cleaner injection apparatus, washing liquid recovery unit, water washing pipeline, the pipeline is washed in cleaner injection apparatus intercommunication water, cleaner injection apparatus, water washing pipeline collect back and heat exchanger entrance point intercommunication, washing liquid recovery unit and heat exchanger exit end intercommunication, the heat exchanger exit end still communicates there is the sewage pipes.
2. the acetaldehyde fouling heat exchanger cleaning device according to claim 1, wherein: cleaning agent injection device includes flush pump (12) and has solvent tank (13) that the liquid level instructed, solvent tank (13) bottom and flush pump (12) entrance point intercommunication, flush pump (12) exit end is divided to establish and is extended No. one pipeline (14), No. two pipeline (15) are gone up in proper order and are connected valve D (2), valve E (3), valve F (4), and No. two pipeline (15) terminal intercommunication heat exchanger entrance points, be equipped with valve C (1) on pipeline (14), and No. one pipeline (14) end-to-end connection is at the feed end of solvent tank (13), the water washing pipeline intercommunication is between valve E (3), valve F (4).
3. the acetaldehyde fouling heat exchanger cleaning device according to claim 1 or 2, wherein: the cleaning liquid recovery device comprises a solution tank (16) with a liquid level indicator, a third pipeline (17) is communicated between an inlet end of the solution tank (16) and an outlet end of a heat exchanger, a valve G (5) and a valve H (6) are sequentially connected to the third pipeline (17) from the outlet end of the heat exchanger, the bottom of the solution tank (16) is sequentially communicated with a valve L (10), a filter (18), a valve M (11) and an external drainage pump (19), and the external drainage pump (19) is communicated with a solvent refining pipeline.
4. the acetaldehyde fouling heat exchanger cleaning device according to claim 1 or 2, wherein: the water flush line includes a valve I (7) in communication with a water source, the valve I (7) in communication between valve E (3), valve F (4).
5. The acetaldehyde fouling heat exchanger cleaning device according to claim 3, wherein: and a fourth pipeline (20) with a valve K (9) is communicated with the second pipeline (15) between the valve E (3) and the valve F (4), and the fourth pipeline (20) is communicated with a nitrogen source.
6. The acetaldehyde fouling heat exchanger cleaning device according to claim 1, wherein: the sewage draining pipeline is connected with a valve J (8).
7. A cleaning method using the cleaning apparatus for an acetaldehyde fouling heat exchanger according to any one of claims 1 to 6, characterized in that the cleaning method comprises the steps of:
Step 1): releasing pressure and returning materials of the upper-end technological process pipeline, and closing a valve A (21) on the upper-end technological process pipeline and a valve B (22) on the upper-end technological process pipeline;
step 2): after the pressure in the heat exchanger is discharged to zero through the valve J (8), the valve J (8) is closed;
Step 3): introducing a polar solvent into a solvent tank (13), establishing a 50% liquid level, opening a valve C (1), and starting a flushing pump (12);
step 4): sequentially opening a valve D (2), a valve E (3) and a valve F (4), establishing liquid level in the heat exchanger, stopping a flushing pump (12) when the heat exchanger is completely soaked in the polar solvent, closing the valve E (3), and keeping the heat exchanger soaked for at least 2 hours to dissolve scales to obtain a flushing solution;
Step 5): then opening the valve G (5) and the valve H (6) in sequence, discharging the flushing solution to the solution tank (16) by utilizing the residual pressure in the heat exchanger, discharging the flushing solution in the heat exchanger completely when the liquid level of the solution tank (16) does not rise any more, and closing the valve H (6);
Step 6): sampling in a solution tank (16), observing the flushing solution, if the color of the flushing solution is clear and bright, indicating that the scaling substances are dissolved completely, entering a step 8), and otherwise, entering a step 7);
Step 7): repeating the steps 4) to 6) until the color of the washing solution is clear and bright, which indicates that the scaling substances are dissolved completely;
Step 8): after the liquid level of the solution tank (16) is higher than 50%, opening a valve L (10) and a valve M (11), starting an external discharge pump (19), filtering a flushing solution by a filter (18), and sending the external discharge pump (19) for refining;
step 9): when the washing solution in the heat exchanger is emptied and all the washing solution is sent to the solution tank (16), opening a valve I (7), introducing water for washing, monitoring and sampling the washing water in the solvent tank (16) in real time until the COD of the washing water is less than 700PPM, and closing the valve I (7) to stop the water washing until the washing water is qualified;
step 10): opening a valve J (8) to send residual sewage to a sewage discharge pipeline;
step 11): closing the valves F (4) and G (5), and respectively disassembling and separating the valves F (4) and E (3) and the valves G (5) and H (6);
step 12): and opening the valve A (21) and the valve B (22), replacing the padding by the upper-end process flow pipeline, and putting the heat exchanger into use.
8. the method for cleaning a cleaning device for an acetaldehyde fouling heat exchanger according to claim 7, wherein: in the step 6), opening a valve G (5) and a valve H (6) to discharge the solution to a solution tank by utilizing the residual pressure in the heat exchanger, and opening a purging nitrogen valve K (9) to accelerate the discharge rate of the solution; and 10) opening a valve J (8) to send the residual sewage to a sewage discharge pipeline, and opening a purging nitrogen valve K (9) to purge so as to completely discharge residual liquid in the heat exchanger.
9. the method for cleaning a cleaning apparatus for an acetaldehyde fouling heat exchanger according to claim 7 or 8, wherein: when the filter (18) is clogged in step 8), the valves L (10) and M (11) are closed, and the filter (18) is cut and cleaned.
10. the method for cleaning a cleaning device for an acetaldehyde fouling heat exchanger according to claim 7, wherein: the cleaning agent is propylene oxide;
and the valve C (1), the valve D (2), the valve F (4), the valve G (5), the valve L (10) and the valve M (11) are stop valves, and the valve E (3), the valve H (6), the valve I (7), the valve J (8) and the valve K (9) are ball valves.
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