Summary of the invention
Above-mentioned scavenging period of the prior art is long in order to overcome at least in part, medicament expense is with defectives such as height, descale effect differences, eliminates the fouling of GGH heat exchange element and stops up, the invention provides a kind of newly, clean-out system and cleaning fast and effectively.
According to an aspect of the present invention, provide a kind of clean-out system, in particular for cleaning the GGH heat-exchanging component, perhaps be used for the clean-out system of scale removal, described clean-out system comprises alkaline cleaning fluid and the acidic cleaning solution that uses respectively,
Described alkaline cleaning fluid contains the highly basic of 1.6~11.0%wt, the permeate agent of 0.7~2.4%wt, the scale-dissolving agent of 1.2~3.5%wt, the tensio-active agent of 0.3~1.2%wt, the stripper b of 0.2~1.3%wt, and the water of surplus;
Described acidic cleaning solution contains the strong acid of 2.6~5.5%wt, the permeate agent of 0.7~2.4%wt, the solubility promoter of 0.3~1.2%wt, the inhibiter of 0.2~0.6%wt, the stripper a of 0.2~1.3%wt, and the water of surplus.
Described alkaline cleaning fluid and acidic cleaning solution are not particularly limited on the use order, can use alkaline cleaning fluid earlier, also can use acidic cleaning solution earlier.Volume ratio or weight ratio that described alkaline cleaning fluid and acidic cleaning solution use also are not particularly limited.In one embodiment, the volume ratio scope that described alkaline cleaning fluid and acidic cleaning solution use is about 95: 5-5: 95, and in one embodiment, volume ratio is about 90: 10-10: 90, in one embodiment, volume ratio is about 80: 20-20: 80, and in one embodiment, volume ratio is about 70: 30-30: 70, in one embodiment, volume ratio is about 60: 40-40: 60, and in one embodiment, volume ratio is for being 50: 50 substantially.
Described permeate agent, scale-dissolving agent, tensio-active agent, inhibiter, solubility promoter and stripper can adopt this type of reagent well known in the art.Wherein stripper b (basic) expression is used for the stripper of alkaline cleaning fluid, and stripper a (acid) expression is used for the stripper of acidic cleaning solution.
In one embodiment, described stripper b is selected from one or more in poly aspartic acid (PASP), poly-epoxy succinic acid (PESA), polyacrylic acid (PAA) and the sodium polyacrylate (PAAS), is preferably polyacrylic acid.
In one embodiment, described stripper a is selected from one or more in poly aspartic acid (PASP), poly-epoxy succinic acid (PESA), 2-hydroxyethylidene diphosphonic acid guanidine-acetic acid (HPAA) and the ethylene diamine tetra methylene phosphonic acid (EDTMP), is preferably poly aspartic acid.
According to an aspect of the present invention, a kind of clean-out system is provided, in particular for cleaning the clean-out system of GGH heat-exchanging component, described clean-out system comprises alkaline cleaning fluid and the acidic cleaning solution that uses respectively, described alkaline cleaning fluid contains the highly basic of 2.0~10.0%wt, the permeate agent of 1.0~2.0%wt, the scale-dissolving agent of 1.5~3.0%wt, the tensio-active agent of 0.5~1.0%wt, the stripper b of 0.5~1.0%wt, and the water of surplus; Described acidic cleaning solution contains the strong acid of 3.0~5.0%wt, the permeate agent of 1.0~2.0%wt, the solubility promoter of 0.5~1.0%wt, the inhibiter of 0.3~0.5%wt, the stripper a of 0.5~1.0%wt, and the water of surplus.
In one embodiment, described alkaline cleaning fluid contains the highly basic of 3~8%wt, the permeate agent of 1%wt, the scale-dissolving agent of 1.5%wt, the tensio-active agent of 0.5%wt, the stripper b of 0.5%wt and the water of surplus; Described acidic cleaning solution contains the strong acid of 3.5~4.5%wt, the inhibiter of 0.3%wt, the permeate agent of 1.0%wt, the solubility promoter of 0.5%wt, the stripper a of 0.5%wt, and the water of surplus.Preferably, described highly basic is NaOH, and described strong acid is HCl, and described permeate agent is fatty alcohol-polyoxyethylene ether (JFC).Preferably, in one embodiment, described alkaline cleaning fluid contains the NaOH of 6%wt, and described acidic cleaning solution contains the HCl of 4%wt.
In one embodiment, described highly basic is selected from alkali metal base, and for example one or both among NaOH and the KOH are preferably NaOH.
In one embodiment, described permeate agent is selected from fatty alcohol-polyoxyethylene ether (JFC), Zhong Xin polyoxyethylenated alcohol (JFC-2), high fatty alcohol polyethylene oxide ether, for example one or more in SFC, aerosol-OT salt (fast penetrant T) and the succsinic acid di-sec-octyl sodium sulfonate (quickly penetrating agent S) are preferably fatty alcohol-polyoxyethylene ether.
In one embodiment, described scale-dissolving agent is selected from one or more in EDTA (b diammonium edta), hydrolytic polymaleic anhydride (HPMA), Amino Trimethylene Phosphonic Acid (ATMP) and the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP), is preferably hydrolytic polymaleic anhydride.
In one embodiment, described tensio-active agent is selected from one or more in dodecyl benzyl dimethyl ammonium chloride (1227), cetyl trimethylammonium bromide (1631), octadecyl trimethyl ammonium chloride (1831), desugar sodium lignosulfonate (M-9), alkylphenol polyoxyethylene (APE) and the alkylphenol polyethylene oxide ether (for example OP), is preferably dodecyl benzyl dimethyl ammonium chloride.
In one embodiment, described inhibiter is selected from benzotriazole (BTA), 2-mercaptobenzothiazole (MBT), quaternary ammonium salt inhibiter (for example XD-16) and imidazolines inhibiter (for example, IS-126) in one or more is preferably XD-16.
In one embodiment, described strong acid is selected from one or more in the strong acid such as HCl, HNO3, HF and H2SO4, is preferably HCl.
In one embodiment; described solubility promoter is selected from one or more in vinylformic acid-acrylate-phosphonic acids-sulfonate tetrapolymer (TH-241), TH-3100 carboxylate salt-sulfonate-nonionic terpolymer (TH-3100) and the phosphono-carboxylic acids multipolymer (POCA), is preferably vinylformic acid-acrylate-phosphonic acids-sulfonate tetrapolymer.
According to another aspect of the present invention, provide a kind of cleaning of GGH heat-exchanging component, described cleaning comprises alkali cleaning step, acid pickling step, and the high pressure water washing step between described alkali cleaning step and the acid pickling step; Described alkali cleaning step comprises, uses alkaline cleaning fluid to carry out static immersing at 65~85 ℃, and soak time is 5~8.5h; Described acid pickling step comprises, uses acidic cleaning solution to carry out static immersing at 45~65 ℃, and soak time is 5~8.5h.
In one embodiment, described alkali cleaning step is carried out static immersing at 70~80 ℃, and soak time is 6~8h, for example 7h; Described acid pickling step carries out static immersing at 50~60 ℃, and soak time is 6~8h, for example 7h.
In a preferred embodiment, described alkali cleaning step is carried out static immersing at 75 ℃, and soak time is 6.5h; Described acid pickling step carries out static immersing at 55 ℃, and soak time is 6.5h.
In one embodiment, the amount of scale buildup degree according to the GGH heat-exchanging component repeats described cleaning, until cleaning up.
In one embodiment, the cleaning of GGH heat-exchanging component of the present invention can be expressed as follows:
In one embodiment, carry out described alkali cleaning step earlier, carry out described acid pickling step again; In another embodiment, carry out described acid pickling step earlier, carry out described alkali cleaning step again.In a preferred embodiment, described cleaning is by as the described alkali cleaning step of the first step, as the described high pressure water washing step in second step, and forms as the described acid pickling step in the 3rd step.In addition, the same with clean-out system, volume ratio or weight ratio that described alkaline cleaning fluid and acidic cleaning solution use also are not particularly limited, and alkaline cleaning fluid in the above-mentioned clean-out system and acidic cleaning solution volume ratio are equally applicable to cleaning.
Adopt the cleaning and the clean-out system of GGH heat-exchanging component of the present invention,, clean repeatedly repeatedly and the GGH heat-exchanging component can be cleaned up for the GGH heat-exchanging component of serious fouling.The cleaning of GGH heat-exchanging component of the present invention and clean-out system have clean fast, thoroughly, advantages such as low, the environmental protection of cost; For the fouling of the stubbornness on GGH heat exchange element surface, also can clean quickly and efficiently.In addition, after reading this specification sheets, those skilled in the art also can know other advantage of the present invention and effect apparently.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment, should be appreciated that, these specific embodiments only are used to purpose of the present invention is described, and are not intended to restriction the present invention.Those skilled in the art can carry out various modifications, modification and correction to it apparently after reading specification sheets, these modifications, modification and correction all fall within the scope of the present invention.
Except as otherwise noted, the per-cent among the present invention all is weight percents.
Embodiment 1
Adopt following clean-out system:
Alkaline cleaning fluid contains the water of 6%wtNaOH, 1%wtJFC, 1.5%wtHPMA, 0.5%wtl227,0.5%wtPAA and surplus; Acidic cleaning solution contains 4%wtHCl, 0.3%wt XD-16,1.0%wtJFC, 0.5%wt TH-241,0.5%wtPASP, and the water of surplus.
And adopt following cleaning:
High pressure water washing → alkali cleaning step → high pressure water washing → acid pickling step.
The alkali cleaning step is carried out static immersing at 75 ℃, and soak time is 6.5h; Acid pickling step carries out static immersing at 55 ℃, and soak time is 6.5h.
Having removed area fully is 0.1m
2, thickness is the GGH heat-exchanging component fouling of 7mm, consumes alkaline cleaning fluid and the acidic cleaning solution of each 500mL altogether, whole cleaning process amounts to about 13 hours.
Embodiment 2
Adopt following clean-out system:
Alkaline cleaning fluid contains the water of 2%wtNaOH, 1.5%wt fast penetrant T, 1.5%wtEDTA, 0.5%wt 1631,0.5%wtPASP and surplus; Acidic cleaning solution contains 3%wtHCl, 0.3%wtBTA, 1.0%wtJFC, 0.5%wt TH-3100,0.5%wt PESA, and the water of surplus.
And adopt following cleaning:
High pressure water washing → alkali cleaning step → high pressure water washing → acid pickling step.
The alkali cleaning step is carried out static immersing at 70 ℃, and soak time is 5h; Acid pickling step carries out static immersing at 50 ℃, and soak time is 5h.
Having removed area fully is 0.1m
2, thickness is the GGH heat-exchanging component fouling of 6mm, consumes alkaline cleaning fluid and the acidic cleaning solution of each 500mL altogether, whole cleaning process amounts to about 10 hours.
Embodiment 3
Adopt following clean-out system:
Alkaline cleaning fluid contains the water of 10%wtNaOH, 0.8%wtJFC, 1.5%wtHPMA, 0.5%wtM-9,0.5%wtPAAS and surplus; Acidic cleaning solution contains 5%wtHCl, 0.3%wtMBT, 1.0%wtJFC, 0.5%wt POCA, 0.5%wt HPAA, and the water of surplus.
And adopt following cleaning:
High pressure water washing → alkali cleaning step → high pressure water washing → acid pickling step.
The alkali cleaning step is carried out static immersing at 80 ℃, and soak time is 8h; Acid pickling step carries out static immersing at 60 ℃, and soak time is 8h.
Having removed area fully is 0.1m
2, thickness is the GGH heat-exchanging component fouling of 7mm, consumes alkaline cleaning fluid and the acidic cleaning solution of each 500mL altogether, whole cleaning process amounts to about 16 hours.
Those skilled in the art are readily appreciated that clean-out system of the present invention not only is applicable to the GGH heat-exchanging component, also are applicable to similar occasion, for example are used for the cleaning of boiler etc.