CN104722542A - Method and device for circularly flushing carbon steel pipes of refined cooling system - Google Patents
Method and device for circularly flushing carbon steel pipes of refined cooling system Download PDFInfo
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- CN104722542A CN104722542A CN201310718218.6A CN201310718218A CN104722542A CN 104722542 A CN104722542 A CN 104722542A CN 201310718218 A CN201310718218 A CN 201310718218A CN 104722542 A CN104722542 A CN 104722542A
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- carbon steel
- pipeline
- pickling
- cleaning
- compressed air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to a method and a device for circularly flushing carbon steel pipes of a refined cooling system. The device is characterized by comprising a cleaning box, cleaning pump inlet ball valves, a cleaning pump, a cleaning pump inlet ball valve, a high-pressure air source, a matching device, a cleaning unit, a temporary stop valve, an eccentric reducing tube and a reducing tube, wherein the cleaning box is connected to the cleaning pump through a pipe; the cleaning pump inlet ball valves are arranged on pipes at two ends of the cleaning pump; the high-pressure air source and the matching device are arranged at positions close to an inlet of a cleaning pipe, so that cleaning liquid can be subjected to matching in real time, and the flowing speed and the flowing state of the cleaning liquid are adjusted; and the cleaning unit and the temporary stop valve can be selected according to the diameters of pipes, and an optimum effect can be achieved. By the eccentric reducing tube, foreign matters are prevented from being stopped and jammed, and the circumstance that the foreign matters are stored at a joint is avoided.
Description
Technical field
The present invention relates to a kind of pipe flushing method, after particularly relating to the welding of a kind of carbon steel piping, the guarantee of the inner surface treatment in butt welded seam and heat-affected zone obtains the carbon steel lubrication piping cleaning method of good cleannes.
Background technology
Because carbon steel piping can form thicker oxide layer at pipe interior in manufacture, processing, welding and assembling process, inner surface also easily adheres to some greases, dust and other particle simultaneously, these factors all directly can have influence on the serviceability of pipeline, thus pipe-line system flushing operation just becomes one very important operation, and developing result also will be directly connected to the stability that device systems from now on runs.
Through the tracing observation of on-the-spot flushing of pipeline for many years, three kinds of combining forms that surface depends on, shallow junction closes and deeply combine roughly can be divided between the foreign particles that pipe interior exists and inner-walls of duct, so-called surface depends on and generally refers to that pipeline and particle can not exist adhesion between the two, as dust, the welding slag etc. that comes off; So-called shallow junction closes and refers to that pipeline and particle exist a little adhesion between the two, as the oxide-film etc. that grease class, chemical reaction are formed; So-called dark combination refers to that pipeline and particle exist higher adhesion between the two, and this kind of particle is temporary transient more difficultly to be removed from pipeline, as welding slag etc., but once peel off from pipeline and will cause that of larger damage to the equipment in operational system; In system is colluded with, because lubrication piping is made up of the carbon steel piping of different latus rectum size, what adopt in many situations that cleaning is on-the-spot is reducer method of attachment, but when this kind of method is implemented foreign matter easily retain, detention and be trapped in reducer inlet ambient, foreign matters is eliminated; Rinse in operation in system, when the process of degreasing preserved egg more easily makes the decline of adhered particles adhesion and system pipeline is higher in temperature, flow velocity cleans under acidic cleaner faster, inner-walls of duct attachment is more prone to free and comes off and when cleaning, be in cleaning performance the best of the cleaning fluid under turbulent condition; Before this technology is implemented, in order to ensure effective cleaning performance, when hooking wash cycles, needing to clean to knock pipeline welding position and crooked position with wooden mallet, thus the second cosmic velocity of dirt can be accelerated; In order to ensure effective cleaning, when cleaning, just cleaning fluid must present turbulent condition can guarantee effect, namely Reynolds number must more than 4000, if Reynolds number is inadequate, cleaning performance is generally poor; At present, what domestic most carbon steel piping adopted is conventional flush process, first pass through strong acid pickling, add the basic solvent neutralization of suitable concentration again, purge finally by compressed air or nitrogen, this technique major defect has: the situation that there is overpickling and deficient pickling in acid cleaning process, overpickling causes iron loss large, pipeline is thinning, and also will consume the acid solution of a great deal of, and the result that deficient pickling brings is exactly that pipe pickling is thorough, internal washing is unclean; Purging method used in the past cannot meet on-the-spot rinsing requirement, and therefore, a kind of new douching technique of exigence solves above-mentioned technical problem.Retrieve through Chinese patent, application number 200910303851.2 " a kind of cleaning method of stainless steel pipes ", this technical scheme has the beneficial effect to stainless steel pipes cleaning, but there is following defect in the method: one is that the method is because the method needs a large amount of High Pressure Pure Waters and nitrogen, general enterprise's field conduct difficulty of getting up is larger, and the nitric acid of the method higher concentration used can seethe with excitement when high temperature steam when using, larger to human injury; Two is the method is be used on stainless steel pipes, and for ordinary carbon steel, the material difference due to pipeline itself causes in fact being be not easy to reach the requirement that will rinse precision; Three is that the method is only applicable to off-line cleaning, is not suitable for the online wash cycles of pipeline.Therefore, a kind of new technical scheme of exigence solves above-mentioned technical problem.
Summary of the invention
The present invention, just for the technical problem existed in prior art, provides a kind of spray cooling to lubricate carbon steel piping circulation flushing method, mainly solves economic and practical cleaning that scene that existing method exists is difficult to realize and the not good technical problem of developing result.
To achieve these goals, technical scheme of the present invention is as follows, and a kind of spray cooling system carbon steel piping circulation flushing method, comprises the following steps: 1)) classification of the carbon steel piping of different latus rectums to be rinsed is connected, in open ended;
2) in classification pipeline to be rinsed, passing into compressed air purge 15 ~ 30 minutes, going out being attached to the more shallow impurity in pipe interior surface from open-mouth;
3) in the pipeline of different latus rectum, put into the steel ball of different latus rectum, the quantity of described steel ball is at least 3, compressed air is utilized internally to be blown into from pipeline opening by steel ball, further utilize the contact vibration between steel ball and tube wall, the impurity making adhesion lower gets loose from tube wall and to go out with gas purging; In described steel ball physical vibration step, compressed air drives steel ball to flow in pipeline, is meeting the welding position places such as elbow, because effect of inertia and inner-walls of duct collide, vibration can be formed at weld, reach the effect that artificial hammering welding position promotes dirt second cosmic velocity;
4) carbon steel piping open section to be rinsed be connected to system and pass in the stronger NaOH degreaser of degreasing the degreasing 1 ~ 2 hour that circulates, the particle adhesion making adhesion larger further reduces, and carries out ungrease treatment;
5) after degreasing half an hour, pass into compressed air carry out proportioning to pipeline and blow liquid more than 30 minutes;
6) cut off degreasing system continuation compressed air and purge 10 ~ 20 minutes, remove degreaser;
7) carry out pickling processes, pass into HCL solution pickling 2 ~ 4 hours, after pickling half an hour, pass into 120 ° of 1.0Mpa steam and acid solution form gas-liquid proportioning liquid turbulence acid dip;
8) cut off pickling system continuation compressed air and purge 10 ~ 30 minutes, remove residue acid solution, check after pickling that tube wall clean foreign of doing something in disregard of obstacles is rustless, steel pipe presents argenteous metallic luster;
9) carry out neutralisation treatment, to pass in alkaline solution and 2 hours, require that reaching neutralization number PH is 7 ~ 8 alkalescents, and check;
10) compressed air is used to purge style dry-cure in 30 minutes;
11) be filled with mist lubrication oil in pipe to form barrier film and cut off oxygen in inner-walls of duct and air, reduce be oxidized, antirust;
12) the online lubricating oil used is filled with in pipe antirust.
As a modification of the present invention, in described step 7, in steam turbulent flow proportioning, steam is filled with from circumferential air distribution port to pipe interior, is blown into pipe interior with the inlet portion of carbon steel pipeline to be rinsed with entrance angle 30 ° ~ 45 °, converge with pickle in pipeline is irregular, form turbulent shape.The advantage of this technical scheme is as follows, and 1) by temperature change, the effect of expanding with heat and contract with cold, in pipeline, the adhesion of residue declines further, so that a large amount of oxide skin removed on weld seam and slagging scorification; 2) flushing liquor is under the thrust of steam pressure, increases cleaning fluid rate of circulating flow in the duct; 3) a kind of turbulent condition of flushing liquor self-assembling formation under vapor action, cleaning fluid can be contacted with the material on inner-walls of duct fully, and physics, chemical reaction are more abundant; 4) owing to there is certain moisture in steam, under the situation progressively cooled after carrying out heat exchange with pipeline, moisture is separated out to be dissolved in cleaning fluid and is reached nature and dilute and the effect reducing pickle concentration, reduces next step time neutralized and effect; 5) because the effect under steel ball effect in early stage more makes system pipeline top layer have the attachment free disengaging rapidly of certain adhesion inside under defatting step and acid solution effect, thus the effect removing foreign object in pipe is reached further.
As a modification of the present invention, in described step 4, ungrease treatment is, is that the sodium hydroxide solution of 40 ° ~ 50 ° passes into carbon steel piping circulation 1 ~ 2 hour, its ducted greasy dirt and dirt are got loose by temperature;
As a modification of the present invention, described pickling processes is, be 10% ~ 15% by concentration, temperature is that the HCL solution of 50 ~ 60 ° passes into carbon steel piping cycle pickling 2 ~ 4 hours, or according to first adding water 80%, then add hydrochloric acid 20% mixed method configuration acid solution in casing and carry out pickling; This kind of method is beneficial to on-the-spot hook by demand and carries out pickling to pickle;
As a modification of the present invention, described neutralisation treatment is, be 6% ~ 12% by concentration, temperature be 30 ~ 40 ° Na
2pO
4solution to pass in carbon steel piping circulation and 2 hours. or first add water 90%, then in adding sodium phosphate 10% mixed method configuration neutralizer carrying out in casing and; Inner-walls of duct is made to be able to effective passivation;
As a modification of the present invention, described step (8) pickling quality inspection, arrange corresponding plug observation panel in some positions of pipeline before pickling, the pipeline of corresponding different size adopts similar and different size plug, is quantitatively at least 4.
As a modification of the present invention, in described step (9) and quality examination, adopt the inspection of PH test paper.
As a modification of the present invention, compressed air described in step (2), (3) and step (5), (6), (10) is that the clean air of the 3 ~ 5Mpa adopting high-precision filter to filter purges carbon steel pipeline.In this step, dry up in pipe with the clean air that high-precision filter filters, guaranteeing the carbon steel pipe inner surface dried and clean after neutralizing, being purged by the compressed air through lubricating oil atomization, obtaining good inner surface quality.
A kind of spray cooling system carbon steel piping circulating flusher, it is characterized in that, described flusher is by cleaning case, scavenging pump Inlet ball valve, scavenging pump, scavenging pump Inlet ball valve, high-pressure air source, matching device, cleaning unit, interim stop valve, eccentric reducer, reducer forms, described cleaning case is connected to scavenging pump by pipeline, scavenging pump Inlet ball valve be arranged on the two ends pipeline of scavenging pump, high-pressure air source and matching device are arranged on close to pipe blow-through entrance, thus to the real-time proportioning of cleaning fluid, flow velocity and the flow regime of cleaning fluid is adjusted with this, cleaning unit and interim stop valve make a choice for the pipeline of different latus rectum, optimum efficiency is reached with this.Eccentric reducer is set, avoids the generation that foreign matter retains middle detention and delay, thus reach and stop the phenomenon that foreign matter remains in interface.
Relative to prior art, beneficial effect of the present invention is as follows: the easy easy making of the inventive method, and can the preceding step completing flushing of quickness and high efficiency; Reasonablely can realize the set goal; The present invention can utilize physical vibration principle to remove the foreign matter of spare part surface adhesion preferably, under the prerequisite of clean-up performance ensureing need of production, have simple, by place restriction, short advantage consuming time, the needs of manufacturing schedule can be ensured better, because the cleannes of cleaning are high, the filter element replacing amount in production run process reduces greatly.By the effect of cooperatively interacting of steel ball physical vibration step, steam turbulent flow step, air-dry and atomization steps in this technical scheme, reach low cost, the object that developing result is good.
Accompanying drawing explanation
Fig. 1 is circulatory system figure of the present invention;
Fig. 2 is turbulent device schematic diagram of the present invention;
Fig. 3,4 is reducer comparison diagram of the present invention;
In figure: 1-cleaning case; 2-scavenging pump Inlet ball valve; 3-scavenging pump; 4-scavenging pump Inlet ball valve; 5-source of the gas; 6-matching device; 7-cleaning unit; The interim stop valve of 8-; The eccentric reducer of 9-; 10-reducer.
Detailed description of the invention
In order to deepen the understanding of the present invention and understanding, below in conjunction with the drawings and specific embodiments the present invention being made further instructions and introducing.
embodiment 1:
A kind of spray cooling system carbon steel piping circulation flushing method, said method comprising the steps of: 1)) classification of the carbon steel piping of different latus rectums to be rinsed is connected, in open ended;
2) in classification pipeline to be rinsed, passing into compressed air purge 15 ~ 30 minutes, going out being attached to the more shallow impurity in pipe interior surface from open-mouth;
3) in the pipeline of different latus rectum, put into the steel ball of different latus rectum, the quantity of described steel ball is at least 3, compressed air is utilized internally to be blown into from pipeline opening by steel ball, further utilize the contact vibration between steel ball and tube wall, the impurity making adhesion lower gets loose from tube wall and to go out with gas purging; In described steel ball physical vibration step, compressed air drives steel ball to flow in pipeline, is meeting the welding position places such as elbow, because effect of inertia and inner-walls of duct collide, vibration can be formed at weld, reach the effect that artificial hammering welding position promotes dirt second cosmic velocity;
4) carbon steel piping open section to be rinsed be connected to system and pass in the stronger NaOH degreaser of degreasing the degreasing 1 ~ 2 hour that circulates, the particle adhesion making adhesion larger further reduces, and carries out ungrease treatment;
8) after degreasing half an hour, pass into compressed air carry out proportioning to pipeline and blow liquid more than 30 minutes;
9) cut off degreasing system continuation compressed air and purge 10 ~ 20 minutes, remove degreaser;
10) carry out pickling processes, pass into HCL solution pickling 2 ~ 4 hours, after pickling half an hour, pass into 120 ° of 1.0Mpa steam and acid solution form gas-liquid proportioning liquid turbulence acid dip;
8) cut off pickling system continuation compressed air and purge 10 ~ 30 minutes, remove residue acid solution, check after pickling that tube wall clean foreign of doing something in disregard of obstacles is rustless, steel pipe presents argenteous metallic luster;
9) carry out neutralisation treatment, to pass in alkaline solution and 2 hours, require that reaching neutralization number PH is 7 ~ 8 alkalescents, and check;
10) compressed air is used to purge style dry-cure in 30 minutes;
11) be filled with mist lubrication oil in pipe to form barrier film and cut off oxygen in inner-walls of duct and air, reduce be oxidized, antirust;
12) the online lubricating oil used is filled with in pipe antirust.
Described circulation flushing is, pipeline connections all in system are made it to become closed-loop system, further connection flexible pipe is carried out pre-flush in the pre-connection, because flexible pipe is the more difficult element cleaned up, adopting high velocity liquid stream to carry out hydro-peening, in order to compensate flushing speed, adopting the method for liquid gas proportioning, strengthen flow stream velocity, be beneficial to and take away dirt; Further, different tube diameters loop increases by one group of stop valve; It is characterized by and effective assignment of traffic is carried out to the liquid in pipeline.Further, under the large volume of large gauge pipe arrangement or pipe arrangement, the power of air compressor machine also there will be not enough situation, need to increase flow control valve on described pipeline temporarily, valve section to normal operating increases pressure, closes other temporary valves, carries out assignment of traffic.
embodiment 2:
As a modification of the present invention, in described step 7, in steam turbulent flow proportioning, steam is filled with from circumferential air distribution port to pipe interior, is blown into pipe interior with the inlet portion of carbon steel pipeline to be rinsed with entrance angle 30 ° ~ 45 °, converge with pickle in pipeline is irregular, form turbulent shape.The advantage of this technical scheme is as follows, and 1) by temperature change, the effect of expanding with heat and contract with cold, in pipeline, the adhesion of residue declines further, so that a large amount of oxide skin removed on weld seam and slagging scorification; 2) flushing liquor is under the thrust of steam pressure, increases cleaning fluid rate of circulating flow in the duct; 3) a kind of turbulent condition of flushing liquor self-assembling formation under vapor action, cleaning fluid can be contacted with the material on inner-walls of duct fully, and physics, chemical reaction are more abundant; 4) owing to there is certain moisture in steam, under the situation progressively cooled after carrying out heat exchange with pipeline, moisture is separated out to be dissolved in cleaning fluid and is reached nature and dilute and the effect reducing pickle concentration, reduces next step time neutralized and effect; 5) because the effect under steel ball effect in early stage more makes system pipeline top layer have the attachment free disengaging rapidly of certain adhesion inside under defatting step and acid solution effect, thus the effect removing foreign object in pipe is reached further.All the other steps are identical with embodiment 1 with advantage.
embodiment 3:
As a modification of the present invention, in described step 4, ungrease treatment is, is that the sodium hydroxide solution of 50 ° ~ 70 ° passes into carbon steel piping circulation 1 ~ 2 hour by temperature.All the other steps are identical with embodiment 1 with advantage.
embodiment 4:
As a modification of the present invention, described pickling processes is, be 10% ~ 15% by concentration, temperature is that the HCL solution of 50 ~ 60 ° passes into carbon steel piping cycle pickling 2 ~ 4 hours, or according to first adding water 80%, then add hydrochloric acid 20% mixed method configuration acid solution in casing and carry out pickling.All the other steps are identical with embodiment 1 with advantage.
embodiment 5:
As a modification of the present invention, described neutralisation treatment is, be 6% ~ 12% by concentration, temperature be 30 ~ 40 ° NA2PO4 solution to pass in carbon steel piping circulation and 2 hours. or first add water 90%, then in adding sodium phosphate 10% mixed method configuration neutralizer carrying out in casing and.All the other steps are identical with embodiment 1 with advantage.
embodiment 6:
As a modification of the present invention, described step (8) pickling quality inspection, arrange corresponding plug observation panel in some positions of pipeline before pickling, the pipeline of corresponding different size adopts similar and different size plug, is quantitatively at least 4.All the other steps are identical with embodiment 1 with advantage.
embodiment 7:
As a modification of the present invention, in described step (9) and quality examination, adopt the inspection of PH test paper.All the other steps are identical with embodiment 1 with advantage.
embodiment 8:
As a modification of the present invention, compressed air described in step (2), (3) and step (5), (6), (10) is that the clean air of the 3 ~ 5Mpa adopting high-precision filter to filter purges carbon steel pipeline.In this step, dry up in pipe with the clean air that high-precision filter filters, guaranteeing the carbon steel pipe inner surface dried and clean after neutralizing, being purged by the compressed air through lubricating oil atomization, obtaining good inner surface quality.All the other steps are identical with embodiment 1 with advantage.
embodiment 9:
See Fig. 1-3, a kind of spray cooling system carbon steel piping circulating flusher, described flusher is by cleaning case 1, scavenging pump Inlet ball valve 2, scavenging pump 3, scavenging pump Inlet ball valve 4, high-pressure air source 5, matching device 6, cleaning unit 7, interim stop valve 8, eccentric reducer 9, reducer 10 forms, described cleaning case 1 is connected to scavenging pump 3 by pipeline, scavenging pump Inlet ball valve 2 and 4 is arranged on the two ends pipeline of scavenging pump 3, high-pressure air source 5 and matching device 6 are arranged on close to pipe blow-through entrance, thus to the real-time proportioning of cleaning fluid, flow velocity and the flow regime of cleaning fluid is adjusted with this, cleaning unit 7 and interim stop valve 8 make a choice for the pipeline of different latus rectum, optimum efficiency is reached with this.Eccentric reducer is set, avoids the generation that foreign matter retains middle detention and delay, thus reach and stop the phenomenon that foreign matter remains in interface.
the introduction of actual flushing case:
embodiment 10:
for (<DN32) carbon steel piping:
(1), the classification of the carbon steel piping of different latus rectums to be rinsed is connected, in open ended;
(2), in classification pipeline to be rinsed, passing into compressed air purge 15 minutes, going out being attached to the more shallow impurity in pipe interior surface from open-mouth;
(3) in pipeline, put into the steel ball being no less than 3 diameter Ф 26, compressed air is utilized internally to be blown into from pipeline opening by steel ball, further utilize the contact vibration between steel ball and tube wall, the impurity making adhesion lower gets loose from tube wall and to go out with gas purging;
(4) carbon steel piping open section to be rinsed be connected to system and pass in the stronger NaOH degreaser of degreasing the degreasing 1 hour that circulates, the particle adhesion making adhesion larger further reduces;
(5) after degreasing half an hour, pass into compressed air carry out proportioning to pipeline and blow liquid 30 minutes;
(6), cutting off degreasing system continuation compressed air purges 10 minutes, removing degreaser;
(7), pass into that temperature is 50 ~ 60 °, concentration be 10% HCL solution pickling 2 hours, after pickling half an hour, pass into 120 ° of 1.0Mpa steam and acid solution form gas-liquid proportioning liquid turbulence acid dip 1.5 hours;
(8), cut off pickling system continuation compressed air and purge 10 minutes, remove residue acid solution, check after pickling that tube wall clean foreign of doing something in disregard of obstacles is rustless, steel pipe presents argenteous metallic luster;
(9), pass into that concentration is 6%, temperature is in the NA2PO4 solution of 30 ~ 40 ° and 2 hours, require that reaching neutralization number PH is 7 ~ 8 alkalescents, checks pH value in process;
(10), compressed air is used to purge style dry-cure in 30 minutes;
(11), be filled with mist lubrication oil in pipe and form barrier film and cut off inner-walls of duct and oxygen in air, reduce be oxidized, antirust;
(12) the online lubricating oil used, is filled with in pipe antirust.
embodiment 11:
for (DN32 ~ DN50) carbon steel piping:
(1), the classification of the carbon steel piping of different latus rectums to be rinsed is connected, in open ended;
(2), in classification pipeline to be rinsed, passing into compressed air purge 20 minutes, going out being attached to the more shallow impurity in pipe interior surface from open-mouth;
(3) in pipeline, put into the steel ball being no less than 3 diameter Ф 28, compressed air is utilized internally to be blown into from pipeline opening by steel ball, further utilize the contact vibration between steel ball and tube wall, the impurity making adhesion lower gets loose from tube wall and to go out with gas purging;
(4) carbon steel piping open section to be rinsed be connected to system and pass in the stronger NaOH degreaser of degreasing the degreasing 1.5 hours that circulates, the particle adhesion making adhesion larger further reduces;
(5) after degreasing half an hour, pass into compressed air carry out proportioning to pipeline and blow liquid 60 minutes;
(6), cutting off degreasing system continuation compressed air purges 15 minutes, removing degreaser;
(7), pass into that temperature is 50 ~ 60 °, concentration be 10% HCL solution pickling 3 hours, after pickling half an hour, pass into 120 ° of 1.0Mpa steam and acid solution form gas-liquid proportioning liquid turbulence acid dip 2.5 hours;
(8), cut off pickling system continuation compressed air and purge 15 minutes, remove residue acid solution, check after pickling that tube wall clean foreign of doing something in disregard of obstacles is rustless, steel pipe presents argenteous metallic luster;
(9), pass into that concentration is 8%, temperature is in the NA2PO4 solution of 30 ~ 40 ° and 2 hours, require that reaching neutralization number PH is 7 ~ 8 alkalescents, checks pH value in process;
(10), compressed air is used to purge style dry-cure in 30 minutes;
(11), be filled with mist lubrication oil in pipe and form barrier film and cut off inner-walls of duct and oxygen in air, reduce be oxidized, antirust;
(12) the online lubricating oil used, is filled with in pipe antirust.
embodiment 12:
for (DN50 ~ DN150) carbon steel piping:
(1), the classification of the carbon steel piping of different latus rectums to be rinsed is connected, in open ended;
(2), in classification pipeline to be rinsed, passing into compressed air purge 20 minutes, going out being attached to the more shallow impurity in pipe interior surface from open-mouth;
(3) in pipeline, put into the steel ball being no less than 3 diameter Ф 42, compressed air is utilized internally to be blown into from pipeline opening by steel ball, further utilize the contact vibration between steel ball and tube wall, the impurity making adhesion lower gets loose from tube wall and to go out with gas purging;
(4) carbon steel piping open section to be rinsed be connected to system and pass in the stronger NaOH degreaser of degreasing the degreasing 2 hours that circulates, the particle adhesion making adhesion larger further reduces;
(5) after degreasing half an hour, pass into compressed air carry out proportioning to pipeline and blow liquid 90 minutes;
(6), cutting off degreasing system continuation compressed air purges 20 minutes, removing degreaser;
(7), pass into that temperature is 50 ~ 60 °, concentration be 15% HCL solution pickling 3 hours, after pickling half an hour, pass into 120 ° of 1.0Mpa steam and acid solution form gas-liquid proportioning liquid turbulence acid dip 2.5 hours;
(8), cut off pickling system continuation compressed air and purge 20 minutes, remove residue acid solution, check after pickling that tube wall clean foreign of doing something in disregard of obstacles is rustless, steel pipe presents argenteous metallic luster;
(9), pass into that concentration is 10%, temperature is in the NA2PO4 solution of 30 ~ 40 ° and 2 hours, require that reaching neutralization number PH is 7 ~ 8 alkalescents, checks pH value in process;
(10), compressed air is used to purge style dry-cure in 30 minutes;
(11), be filled with mist lubrication oil in pipe and form barrier film and cut off inner-walls of duct and oxygen in air, reduce be oxidized, antirust;
(12) the online lubricating oil used, is filled with in pipe antirust.
embodiment 13:
for (>DN150) carbon steel piping:
(1), the classification of the carbon steel piping of different latus rectums to be rinsed is connected, in open ended;
(2), in classification pipeline to be rinsed, passing into compressed air purge 20 minutes, going out being attached to the more shallow impurity in pipe interior surface from open-mouth;
(3) in pipeline, put into the steel ball being no less than 5 diameter Ф 42, compressed air is utilized internally to be blown into from pipeline opening by steel ball, further utilize the contact vibration between steel ball and tube wall, the impurity making adhesion lower gets loose from tube wall and to go out with gas purging;
(4) carbon steel piping open section to be rinsed be connected to system and pass in the stronger NaOH degreaser of degreasing the degreasing 2 hours that circulates, the particle adhesion making adhesion larger further reduces;
(5) after degreasing half an hour, pass into compressed air carry out proportioning to pipeline and blow liquid 90 minutes;
(6), cutting off degreasing system continuation compressed air purges 20 minutes, removing degreaser;
(7), pass into that temperature is 50 ~ 60 °, concentration be 15% HCL solution pickling 4 hours, after pickling half an hour, pass into 120 ° of 1.0Mpa steam and acid solution form gas-liquid proportioning liquid turbulence acid dip 3.5 hours;
(8), cut off pickling system continuation compressed air and purge 20 minutes, remove residue acid solution, check after pickling that tube wall clean foreign of doing something in disregard of obstacles is rustless, steel pipe presents argenteous metallic luster;
(9), pass into that concentration is 12%, temperature is in the NA2PO4 solution of 35 ~ 45 ° and 2 hours, require that reaching neutralization number PH is 7 ~ 8 alkalescents, checks pH value in process;
(10), compressed air is used to purge style dry-cure in 30 minutes;
(11), be filled with mist lubrication oil in pipe and form barrier film and cut off inner-walls of duct and oxygen in air, reduce be oxidized, antirust;
(12) the online lubricating oil used, is filled with in pipe antirust.
At the scene in implementation process in order to ensure cleaning performance and save time, also need to consider some relevant supporting methods, specific as follows:
1) the excessive occasion of end size can be there is in flushing line, in order to compensate because line size is larger, the off-capacity of pump and situation that the flow velocity that causes reduces occurs, proportioning enters compressed air to improve flow velocity, and ensure higher Reynolds number and liquid is in turbulent condition, thus reach the method improving flush efficiency.
2) under the large volume of large gauge pipe arrangement or pipe arrangement, the power of air compressor machine also there will be not enough situation, needs to increase temporary valve on described pipeline, and the valve section to normal operating increases pressure, opens temporary valve after a while, purges.Now this section is played a compensation energy accumulator effect by the pipeline natural energy sealed; Along with the minimizing of gas pressure, in flushing pipe, flow fluid the irregular turbulent condition of formation can be known from experience;
3) before described pipeline uses as accumulator pipeline, interim flange adopts low-intensity paper, and the companion flange that thickness is no more than 2.5MM is fastening.When watering on paper with water after finishing using, because low-intensity paper has strong absorptive, becoming very soft after absorbing water, easily can break up under stress and discharge overpressure, rinsing as accumulator pipeline;
4) circulation flushing uses transit joint connecting pipe, the mutual diameter in position of junction block should have same size as far as possible, but when can not reach this kind of condition in many situations at the scene, reducer method can be adopted, in order to avoid foreign matter retains the generation of middle detention and delay, the present invention recommends to adopt centering type reducer, and bottom pipe, position adopts same absolute altitude and adopts the connection pattern lower than pipeline absolute altitude in upside, thus reaches and stop the phenomenon that foreign matter remains in interface and occur.
At least one in technical characteristic described in embodiment 2,3,4,5,6,7,8 and embodiment 1 can also combine by the present invention, form new embodiment.
It should be noted that above-described embodiment is only preferred embodiment of the present invention; be not used for limiting protection scope of the present invention; equivalent replacement done on the basis of the above or substitute and all belong to protection scope of the present invention, protection scope of the present invention is as the criterion with claims.
Claims (9)
1. a spray cooling system carbon steel piping circulation flushing method, is characterized in that, said method comprising the steps of:
1) classification of the carbon steel piping of different latus rectums to be rinsed is connected, in open ended;
2) in classification pipeline to be rinsed, passing into compressed air purge 15 ~ 30 minutes, going out being attached to the more shallow impurity in pipe interior surface from open-mouth;
3) in the pipeline of different latus rectum, put into the steel ball of different latus rectum, the quantity of described steel ball is at least 3, compressed air is utilized internally to be blown into from pipeline opening by steel ball, further utilize the contact vibration between steel ball and tube wall, the impurity making adhesion lower gets loose from tube wall and to go out with gas purging;
4) carbon steel piping open section to be rinsed be connected to system and pass in the stronger NaOH degreaser of degreasing the degreasing 1 ~ 2 hour that circulates, the particle adhesion making adhesion larger further reduces, and carries out ungrease treatment;
5) after degreasing half an hour, pass into compressed air carry out proportioning to pipeline and blow liquid more than 30 minutes;
6) cut off degreasing system continuation compressed air and purge 10 ~ 20 minutes, remove degreaser;
7) carry out pickling processes, pass into HCL solution pickling 2 ~ 4 hours, after pickling half an hour, pass into 120 ° of 1.0Mpa steam and acid solution form gas-liquid proportioning liquid turbulence acid dip;
8) cut off pickling system continuation compressed air and purge 10 ~ 30 minutes, remove residue acid solution, check after pickling that tube wall clean foreign of doing something in disregard of obstacles is rustless, steel pipe presents argenteous metallic luster;
9) carry out neutralisation treatment, to pass in alkaline solution and 2 hours, require that reaching neutralization number PH is 7 ~ 8 alkalescents, and check;
10) compressed air is used to purge style dry-cure in 30 minutes;
11) be filled with mist lubrication oil in pipe to form barrier film and cut off oxygen in inner-walls of duct and air, reduce be oxidized, antirust;
12) the online lubricating oil used is filled with in pipe antirust.
2. a kind of spray cooling system carbon steel piping circulation flushing method according to claim 1, it is characterized in that, in described step 7, in steam turbulent flow proportioning, steam is filled with from circumferential air distribution port to pipe interior, pipe interior is blown into entrance angle 30 ° ~ 45 ° with the inlet portion of carbon steel pipeline to be rinsed, converge with pickle in pipeline is irregular, form turbulent shape.
3. a kind of spray cooling system carbon steel piping circulation flushing method according to claim 1 and 2, it is characterized in that, in described step 4, ungrease treatment is, is that the sodium hydroxide solution of 50 ° ~ 70 ° passes into carbon steel piping circulation 1 ~ 2 hour by temperature.
4. a kind of spray cooling system carbon steel piping circulation flushing method according to claim 1 and 2, it is characterized in that, described pickling processes is, be 10% ~ 15% by concentration, temperature is that the HCL solution of 50 ~ 60 ° passes into carbon steel piping cycle pickling 2 ~ 4 hours, or according to first adding water 80%, then add hydrochloric acid 20% in casing mixed method configuration acid solution carry out pickling.
5. a kind of spray cooling system carbon steel piping circulation flushing method according to claim 1 and 2, it is characterized in that, described neutralisation treatment is, be 6% ~ 12% by concentration, temperature be 30 ~ 40 ° NA2PO4 solution to pass in carbon steel piping circulation and 2 hours,. or first add water 90%, then in adding sodium phosphate 10% mixed method configuration neutralizer carrying out in casing and.
6. a kind of spray cooling system carbon steel piping circulation flushing method according to claim 1 and 2, it is characterized in that, described step (8) pickling quality inspection, before pickling, corresponding plug observation panel is set in some positions of pipeline, the pipeline of corresponding different size adopts similar and different size plug, is quantitatively at least 4.
7. a kind of spray cooling system carbon steel piping circulation flushing method according to claim 1 and 2, is characterized in that, in described step (9) and quality examination, adopts the inspection of PH test paper.
8. a kind of spray cooling system carbon steel piping circulation flushing method according to claim 1 and 2, it is characterized in that, compressed air described in step (2), (3) and step (5), (6), (10) is that the clean air of the 3 ~ 5Mpa adopting high-precision filter to filter purges carbon steel pipeline.
9. a spray cooling system carbon steel piping circulating flusher, it is characterized in that, described flusher is by cleaning case 1, scavenging pump Inlet ball valve 2, scavenging pump 3, scavenging pump Inlet ball valve 4, high-pressure air source 5, matching device 6, cleaning unit 7, interim stop valve 8, eccentric reducer 9, reducer 10 forms, described cleaning case 1 is connected to scavenging pump 3 by pipeline, scavenging pump Inlet ball valve 2 and 4 is arranged on the two ends pipeline of scavenging pump 3, high-pressure air source 5 and matching device 6 are arranged on close to pipe blow-through entrance, thus to the real-time proportioning of cleaning fluid, flow velocity and the flow regime of cleaning fluid is adjusted with this, cleaning unit 7 and interim stop valve 8 make a choice for the pipeline of different latus rectum, optimum efficiency is reached with this.
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