CN100582640C - In-position cleaning method for town regenerated water plate type heat exchanger - Google Patents
In-position cleaning method for town regenerated water plate type heat exchanger Download PDFInfo
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- CN100582640C CN100582640C CN200810056618A CN200810056618A CN100582640C CN 100582640 C CN100582640 C CN 100582640C CN 200810056618 A CN200810056618 A CN 200810056618A CN 200810056618 A CN200810056618 A CN 200810056618A CN 100582640 C CN100582640 C CN 100582640C
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Abstract
The invention relates to an onsite cleaning method used for a town recycled-water plate heat exchanger. The cleaning method has two steps: the cleaning of a first step adopts an oxidizing bactericide, a carboxyl group chelate agent and a dispersant, aiming at removing surface substances of dirt on the heat exchanging wall face with an effect of killing microorganisms in dirt and removing dirt and also with the effect of leading Ca<2+>, Mg<2+>, Fe<2+> and Fe<3+> in dirt to be converted into dissolving chelate matter and distributing a large quantity of dirt components into particulates to be stably suspended in water; the cleaning of the second step adopts an organic acid dirt-rust removing agent, the oxidizing bactericide and the carboxyl group chelate agent and the dispersant, aiming at removing the bottom substances of the dirt on the heat exchanging wall face with the effect of removing organic dirt and rest microorganism films. The cleaning method proposed by the invention can be applied in the town recycled-water plate heat exchanger made of 304, 316 or further anti-corrosion stainless steel materials, with low corrosion rate, quick dirt removing speed and better effect. The plate heat exchanger can be safely and economically operated for a long period.
Description
Technical field
The present invention relates to a kind of cleaning method on the throne of heat exchanger, particularly a kind of is the cleaning method on the throne of the plate type heat exchanger of heat transferring medium with the town regenerated water.
Background technology
The town regenerated water heat energy recovery is a regenerative resource application technology with obvious energy-saving and emission-reduction benefit.Though town regenerated water process sewage treatment plant multistep treatment, and reach the discharge standard that GB GB18918-2002 stipulates, its water quality is more complicated still, is dissolved with various ions, suspension, particularly contains the higher product foundry loam heterotrophic bacteria of quantity.Because fouling and corrosion harmfulness will take place when making town regenerated water as heat transferring medium in the existence of these materials.
For example, the regeneration water resource heat pump is a kind of typical way of town regenerated water heat energy recovery.Town regenerated water is cool in summer and warm in winter, very suitable low level Cooling and Heat Source as heat pump.Plate type heat exchanger is because of compact conformation, takes up an area of for a short time, and the heat transfer coefficient height is considered to one of first-selected heat exchanger of the efficient reuse of town regenerated water heat energy.Under winter heating's operating mode, utilize plate type heat exchanger heat-obtaining from town regenerated water, low-grade heat realizes that via heat pump grade promotes, the most at last in high-grade heat supply with hot user; Under the summer cooling condition, the heat that heat pump will be fetched from colod-application family is discharged into the town regenerated water by plate type heat exchanger, and this moment, town regenerated water was for carrying a cold medium.
And because the existence of impurity in the above-mentioned town regenerated water will cause scale formation generation in the plate type heat exchanger.Particularly under the summer cooling condition, very suitable growth of microorganism breeding (running temperature is at 25～30 ℃) of temperature in the plate type heat exchanger, so the dirt growth rate is very fast.The generation of scale formation causes the plate type heat exchanger heat-transfer effect to worsen (under the summer cooling condition, plate type heat exchanger operation in continuous 15 days, heat transfer coefficient descends 45% approximately) on the one hand, and the source pump heating efficiency descends; Dirt adheres to for a long time on plate and will cause the underdeposit corrosion phenomenon to take place on the other hand, thereby shortens the plate life-span.
For plate type heat exchanger the most frequently used be to shut down to take cleaning apart, be about to plate type heat exchanger dismounting back plate directly carried out machinery or Chemical cleaning.Because the town regenerated water plate type heat exchanger fouling cycle is shorter; as adopt above-mentioned cleaning way; will cause the dismounting repeatedly of plate type heat exchanger; this mode has seriously been disturbed the normal heat transfer process of system on the one hand; dismounting will speed up the inefficacy of plate type heat exchanger sealing strip repeatedly on the other hand, brings unnecessary economic loss.Particularly for large-scale recycled water source heat pump system, plate type heat exchanger is bulky, and the dismounting difficulty greatly increases, and frequent dismounting can't realize.
Cleaning technique on the throne (Clean-in-place) is a kind of technological package system that comprises equipment, pipeline, operational procedure, cleaning agent formula, automatic control and monitoring requirement are arranged.Utilize cleaning technique on the throne, can under certain temperature, flow velocity, exempt from disassembly, cleaning, finish the removal of dirt, plate type heat exchanger fluid interchange performance is recovered plate type heat exchanger.Therefore, cleaning on the throne is the cleaning way of town regenerated water plate type heat exchanger first-selection.Cleaning success or not key on the throne is the selection of cleaning agent and the formulation of cleaning condition.Consider from dirt composition, dirt is the mixed dirt based on microbial fouling in the town regenerated water plate type heat exchanger, and the target of recirculated cooling water plate type heat exchanger cleaning on the throne at present mostly is crystallisation fouling and particulate fouling, in view of the dirt kind differs greatly, therefore relevant cleaning experience can be not strong with reference to property.Consider that from the dirt attachment state wall adhesive force of dirt is bigger in the town regenerated water plate type heat exchanger, reason is: 1) running temperature of town regenerated water plate type heat exchanger is moderate, helps the breeding growth of microbial fouling; 2) flow between the town regenerated water plate type heat exchanger plate and be in vigorous turbulent flow, quickened near the convective mass transfer the heat exchange wall, help microorganism and obtain sufficient nutriment; 3) the plate type heat exchanger material is based on stainless steel, than adhering to of suitable microorganism.Experimental results show that, to have the recirculating cooling water system cleaning agent now directly applies in the town regenerated water plate type heat exchanger cleaning on the throne, exist cleaning rate slow, dirt is peeled off the deficiency of weak effect, can't reach the cleaning target of recovering plate type heat exchanger fluid interchange performance.
Generally speaking, in view of dirt composition, dirt adhere to the particularity of situation, still do not have reliable cleaning method on the throne for town regenerated water plate type heat exchanger at present, this has seriously restricted applying of the efficient reuse technology of town regenerated water heat energy.
Summary of the invention
The present invention aims to provide a kind of cleaning method on the throne of town regenerated water plate type heat exchanger, utilizes this method can remove schmutzband on the heat-transfer surface fast and efficiently, can guarantee the town regenerated water plate type heat exchanger safety and economic operation.
Technical scheme of the present invention is as follows:
A kind of cleaning method on the throne of town regenerated water plate type heat exchanger is characterized in that, this method is carried out as follows:
1) before adding medicament, in the wash cycles water tank, adds water and be preheated to 35～40 ℃;
2) disodium ethylene diamine tetraacetate and Sodium Polyacrylate are added in the wash cycles water tank successively, make the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reach 100～150mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20～25mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, the dosage of clorox makes the decontaminant concentration of circulating cleaning fluid reach 300～500mg/L;
3) the beginning first step is cleaned, and cleaning temperature is controlled at 35～40 ℃, clean flow be set at normal operating condition mutually
With, scavenging period is 1～2 hour, after clean finishing with the cleaning fluid emptying;
4) repeating step 1), with blue star LX-056A/B, disodium ethylene diamine tetraacetate and Sodium Polyacrylate add in the wash cycles water tank successively, make the concentration of blue star LX-056A/B in circulating cleaning fluid reach 500～700mg/L, the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reaches 200～250mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20～25mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, the dosage of clorox makes the decontaminant concentration of circulating cleaning fluid reach 100～150mg/L;
5) second step of beginning cleans, and cleaning temperature is controlled at 35～40 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 1～2 hour, cleans after the end the cleaning fluid emptying.
The cleaning frequency on the throne of town regenerated water plate type heat exchanger is 5～20 days.In order to obtain optimal cleaning effect, the cleaning frequency on the throne in summer is preferably 5 days, and the cleaning frequency on the throne in winter is preferably 7 days.
The present invention compared with prior art has the following advantages: 1. the cleaning method of the present invention's proposition can be applicable to town regenerated water plate type heat exchanger cleaning process on the throne, scale removal, the rust cleaning finished under the situation of not dismantling, not moving equipment and pipeline plate type heat exchanger are cleaned, and can reach the purpose of recovering plate type heat exchanger fluid interchange performance; 2. the two-step method cleaning process is shot the arrow at the target, and it is the dirt entry material that the first step is cleaned target, wherein chelating agent and dispersant have a performance that helps the oxidizing bactericide effect, the dirt detachment rate can be improved; Clean that main to clean target be dirt bottom material second step, help to slow down dirt regrowth speed, make that heat exchange efficiency can the long term maintenance higher level for the further removing of bottom material.3. the cleaning method of the present invention's proposition is based upon on dirt composition analysis, microscopic observation and the dirt growth course monitoring on the throne basis, used cleaning agent is through carefully screening and having carried out experiment test, clean weak point consuming time, scale removal efficient height, descale effect is not subject to seasonal restrictions, and above-mentioned characteristic all is better than existing cleaning method.
Description of drawings
The process chart that Fig. 1 carries out town regenerated water plate type heat exchanger cleaning on the throne for the cleaning method that adopts the present invention to propose.
Among the figure: the plate type heat exchanger that 1-is to be cleaned; 2-clean cycle pump; 3-wash cycles water tank; 4-data acquisition and control system; The 5-platinum resistance temperature sensor; 6-stainless steel diaphragm seal differential pressure pickup; The 7-flowmeter; 8-controllable temperature heater.
The specific embodiment
The cleaning method on the throne of a kind of town regenerated water plate type heat exchanger provided by the invention, this method is carried out as follows:
1) before adding medicament, in the wash cycles water tank, adds water and be preheated to 35～40 ℃;
2) disodium ethylene diamine tetraacetate and Sodium Polyacrylate are added in the wash cycles water tank successively, make the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reach 100～150mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20～25mg/L, mixes; Treat that solution-stabilized back adds clorox and is stirred to abundant mixing, the dosage of clorox makes the decontaminant concentration of circulating cleaning fluid reach 300～500mg/L;
3) the beginning first step is cleaned, and cleaning temperature is controlled at 35～40 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 1～2 hour, cleans after the end the cleaning fluid emptying;
4) repeating step 1), blue star LX-056A/B, disodium ethylene diamine tetraacetate and Sodium Polyacrylate are added in the wash cycles water tank successively, make the concentration of blue star LX-056A/B in circulating cleaning fluid reach 500～700mg/L, the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reaches 200～250mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20～25mg/L, mixes; Treat that solution-stabilized back adds clorox and is stirred to abundant mixing, the dosage of clorox makes the decontaminant concentration of circulating cleaning fluid reach 100～150mg/L;
5) begin the cleaning of second step, cleaning temperature is controlled at 35～40 ℃, cleans flow and is set at normally operating condition is identical, and scavenging period is 1～2 hour, with the cleaning fluid emptying, finishes cleaning process after cleaning finishes.
Cleaning frequency on the throne was generally 5～20 days, was preferably 5 days in the cleaning frequency on the throne in summer, and the cleaning frequency on the throne in winter is preferably 7 days.
Below in conjunction with specific embodiment content of the present invention is described in detail.
Embodiment 1: the cleaning example on the throne of town regenerated water plate type heat exchanger under winter heating's operating mode
One is the water source heat pump system of Cooling and Heat Source with the town B-grade water outlet, utilizes the Lowlevel thermal energy in the water outlet of plate type heat exchanger recovery town B-grade.In winter, the heat pump heating efficiency descends, and the analysis showed that it is that secondary effluent due to the fouling, determines to adopt cleaning technique on the throne that plate type heat exchanger is cleaned in plate type heat exchanger.
1. purging system overview
Wash cycles water tank capacity: 100L
Plate type heat exchanger material: stainless steel 304
The fouling situation: plate surface high temperature side schmutzband is thicker, and the low temperature side schmutzband is thinner, and the fouling degree is lighter relatively.
2. cleaning method
Plate type heat exchanger purging system on the throne as shown in Figure 1.
When plate type heat exchanger normally moved, data acquisition and control system be by real-time collecting temperature, pressure reduction, data on flows, and side pressure is fallen and two indexs of heat transfer coefficient are carried out on-line monitoring to the plate type heat exchanger recycled water.When above-mentioned two indexs arrived the cleaning limiting value of setting, control system was sent purge signal, cut off recycled water and recirculated water side water route this moment, opened cleaning fluid side valve door, constituted wash cycles on the throne loop, cleaned by following step:
1) before adding medicament, in the wash cycles water tank, add water 50L, test running clean cycle pump can not cause and find time, and liquid is arranged back, then with the water preheat to 35 in the water tank ℃;
2) disodium ethylene diamine tetraacetate of 5g and the Sodium Polyacrylate of 1g are added in the wash cycles water tank successively, make the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reach 100mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, here adopt available chlorine content (in Cl) greater than 10.0% liquor natrii hypochloritis, this liquor natrii hypochloritis's dosage is 300ml, be about 1: 160 with the volume ratio of circulating cleaning fluid, make the decontaminant concentration of circulating cleaning fluid reach 300mg/L;
3) the beginning first step is cleaned, and cleaning temperature is controlled at 35 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 1 hour, cleans after the end the cleaning fluid emptying;
4) repeating step 1), blue star LX-056A/B with 25g, the disodium ethylene diamine tetraacetate of 10g and the Sodium Polyacrylate of 1g add in the wash cycles water tank successively, make the concentration of blue star LX-056A/B in circulating cleaning fluid reach 500mg/L, the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reaches 200mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, here adopt available chlorine content (in Cl) greater than 10.0% liquor natrii hypochloritis, this liquor natrii hypochloritis's dosage is 125ml, with the volume ratio of circulating cleaning fluid be 1: 400, make the decontaminant concentration of circulating cleaning fluid reach 100mg/L;
5) second step of beginning cleans, and cleaning temperature is controlled at 35 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 1 hour, cleans after the end the cleaning fluid emptying.
After cleaning process finishes, cut off the controllable temperature heater power source, cut off wash cycles on the throne loop, open recycled water and recirculated water side valve door, plate type heat exchanger normally moves, and data acquisition and control system continue the plate type heat exchanger performance is carried out on-line monitoring.
In order to reach optimal cleaning effect, the cleaning frequency in winter is preferably 7 days.
3. cleaning performance
Plate type heat exchanger moves 28 days continuously, is the cleaning frequency to have carried out 4 cleanings on the throne altogether with 7 days therebetween.Plate type heat exchanger heat transfer coefficient after cleaning all can return to more than 98% of heat transfer coefficient under the clean conditions, but and long term maintenance higher level.Taking plate type heat exchanger apart observation finds: the plate surface is comparatively cleaned, and does not have tangible dirt to adhere to and evidence of corrosion.
Embodiment 2: the cleaning example on the throne of town regenerated water plate type heat exchanger under the summer cooling condition
One is the water source heat pump system of Cooling and Heat Source with the town B-grade water outlet, utilizes the Lowlevel thermal energy in the water outlet of plate type heat exchanger recovery town B-grade.In summer, the heat pump refrigerating efficiency descends fast, the analysis showed that it is that secondary effluent due to the fouling, determines to adopt cleaning technique on the throne that plate type heat exchanger is cleaned in plate type heat exchanger.
1. purging system overview
Wash cycles water tank capacity: 100L
Plate type heat exchanger material: stainless steel 316
The fouling situation: the plate surface all is attached with the mixed dirt based on microbial fouling from bottom to top, and the fouling degree is heavier.
2. cleaning method
Plate type heat exchanger purging system on the throne as shown in Figure 1.
When plate type heat exchanger normally moved, data acquisition and control system be by real-time collecting temperature, pressure reduction, data on flows, and side pressure is fallen and two indexs of heat transfer coefficient are carried out on-line monitoring to the plate type heat exchanger recycled water.When above-mentioned two indexs arrived the cleaning limiting value of setting, control system was sent purge signal, cut off recycled water and recirculated water side water route this moment, opened cleaning fluid side valve door, constituted wash cycles on the throne loop, cleaned by following step immediately:
1) before adding medicament, in the wash cycles water tank, add water 50L, test running clean cycle pump can not cause and find time, and liquid is arranged back, then with the water preheat to 40 in the water tank ℃;
2) disodium ethylene diamine tetraacetate of 6.5g and the Sodium Polyacrylate of 1.2g are added in the wash cycles water tank successively, make the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reach 125mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 24mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, here adopt available chlorine content (in Cl) greater than 10.0% liquor natrii hypochloritis, this liquor natrii hypochloritis's dosage is 330ml, with the volume ratio of circulating cleaning fluid be 1: 150, make the decontaminant concentration of circulating cleaning fluid reach 400mg/L;
3) the beginning first step is cleaned, and cleaning temperature is controlled at 40 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 1.5 hours, cleans after the end the cleaning fluid emptying;
4) repeating step 1), blue star LX-056A/B with 30g, the disodium ethylene diamine tetraacetate of 12g and the Sodium Polyacrylate of 1.2g add in the wash cycles water tank successively, make the concentration of blue star LX-056A/B in circulating cleaning fluid reach 600mg/L, the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reaches 230mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 24mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, here adopt available chlorine content (in Cl) greater than 10.0% liquor natrii hypochloritis, this liquor natrii hypochloritis's dosage is 125ml, with the volume ratio of circulating cleaning fluid be 1: 400, make the decontaminant concentration of circulating cleaning fluid reach 100mg/L;
5) second step of beginning cleans, and cleaning temperature is controlled at 40 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 1.5 hours, cleans after the end the cleaning fluid emptying.
After cleaning process finishes, cut off the controllable temperature heater power source, cut off wash cycles on the throne loop, open recycled water and recirculated water side valve door, plate type heat exchanger normally moves, and data acquisition and control system continue the plate type heat exchanger performance is carried out on-line monitoring.
In order to reach optimal cleaning effect, the cleaning frequency in summer is preferably 5 days.
3. cleaning performance
Plate type heat exchanger moves 20 days continuously, is the cleaning frequency to have carried out 4 cleanings on the throne altogether with 5 days therebetween.Plate type heat exchanger heat transfer coefficient after cleaning all can return to more than 98% of heat transfer coefficient under the clean conditions, but and long term maintenance higher level.Taking plate type heat exchanger apart observation finds: the plate surface is comparatively cleaned, and does not have tangible dirt to adhere to and evidence of corrosion.
Embodiment 3: the serious town regenerated water plate type heat exchanger cleaning example on the throne of fouling under the summer cooling condition
One is the water source heat pump system of Cooling and Heat Source with the town B-grade water outlet, utilizes the Lowlevel thermal energy in the water outlet of plate type heat exchanger recovery town B-grade.In summer, heat pump moves one-month period continuously, and refrigerating efficiency descends very obvious, the analysis showed that it is that secondary effluent due to the fouling, determines to adopt cleaning technique on the throne that plate type heat exchanger is cleaned in plate type heat exchanger.
1. purging system overview
Wash cycles water tank capacity: 100L
Plate type heat exchanger material: stainless steel 316
The fouling situation: plate surface schmutzband is thicker, and viscosity is bigger, and adhesive force is stronger, and the fouling degree is very serious.
2. cleaning
Plate type heat exchanger purging system on the throne as shown in Figure 1.
Cut off recycled water and recirculated water side water route, open cleaning fluid side valve door, constitute wash cycles on the throne loop, clean by following step immediately:
1) before adding medicament, in the wash cycles water tank, add water 50L, test running clean cycle pump can not cause and find time, and liquid is arranged back, then with the water preheat to 40 in the water tank ℃;
2) disodium ethylene diamine tetraacetate of 7.5g and the Sodium Polyacrylate of 1.3g are added in the wash cycles water tank successively, make the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reach 150mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 25mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, here adopt available chlorine content (in Cl) greater than 10.0% liquor natrii hypochloritis, this liquor natrii hypochloritis's dosage is 360ml, with the volume ratio of circulating cleaning fluid be 1: 140, make the decontaminant concentration of circulating cleaning fluid reach 500mg/L;
3) the beginning first step is cleaned, and cleaning temperature is controlled at 40 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 2 hours, cleans after the end the cleaning fluid emptying;
4) repeating step 1), blue star LX-056A/B with 35g, the disodium ethylene diamine tetraacetate of 13g and the Sodium Polyacrylate of 1.3g add in the wash cycles water tank successively, make the concentration of blue star LX-056A/B in circulating cleaning fluid reach 700mg/L, the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reaches 250mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 25mg/L, mix, treat that solution-stabilized back adds clorox and is stirred to abundant mixing, here adopt available chlorine content (in Cl) greater than 10.0% liquor natrii hypochloritis, this liquor natrii hypochloritis's dosage is 170ml, with the volume ratio of circulating cleaning fluid be 1: 300, make the decontaminant concentration of circulating cleaning fluid reach 150mg/L;
5) second step of beginning cleans, and cleaning temperature is controlled at 40 ℃, cleans flow and is set at identically with normal operating condition, and scavenging period is 2 hours, cleans after the end the cleaning fluid emptying.
After cleaning process finishes, cut off the controllable temperature heater power source, cut off wash cycles on the throne loop, open recycled water and recirculated water side valve door, plate type heat exchanger normally moves, and data acquisition and control system continue the plate type heat exchanger performance is carried out on-line monitoring.
3. cleaning performance
After measured, plate type heat exchanger heat transfer coefficient after cleaning returns to 97% of heat transfer coefficient under the clean conditions.Taking plate type heat exchanger apart observation finds: the plate surface does not have tangible dirt to adhere to and evidence of corrosion, and local fragmentary visible faint yellow mucous membrane adheres to.
Table 1 has provided the cleaning method that proposes among the present invention rate of corrosion experimental data for the plate stainless steel.Experiment showed, and can guarantee that in short scavenging period cleaning process has lower rate of corrosion to stainless steels such as 304,316, reason has three: 1. do not contain the highly acid material in the cleaning agent; 2. first step cleaning process is carried out (the pH value is 9.0～9.5) under alkali condition, and stainless steel plate has corrosion resistance preferably for chlorion; Though the second step cleaning process is carried out (the pH value is 5.5～6.0) under acid condition, chloride ion content has decline largely than the first step in the cleaning fluid; 3. blue star LX-056A/B has the inhibition effect.
The cleaning method that proposes among table 1 the present invention is to the rate of corrosion of stainless steel
| Material | Rate of corrosion (g/m 2·h) | Temperature (℃) | Cleaning frequency (my god)/wash number (inferior) |
| 304 stainless steels | 0.008 | 40 | 5/4 |
| 316 stainless steels | 0.003 | 40 | 5/4 |
Illustrate: according to town regenerated water water quality and recycled water source heat pump system operating condition, the material of town regenerated water plate type heat exchanger should be selected stainless steel 304 and more anti-corrosion stainless steel model for use.
Claims (3)
1. the cleaning method on the throne of a town regenerated water plate type heat exchanger is characterized in that, this method is carried out as follows:
1) before adding medicament, in the wash cycles water tank, adds water and be preheated to 35～40 ℃;
2) disodium ethylene diamine tetraacetate and Sodium Polyacrylate are added in the wash cycles water tank successively, make the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reach 100～150mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20～25mg/L, mixes; Treat that solution-stabilized back adds clorox and is stirred to abundant mixing, the dosage of clorox makes the decontaminant concentration of circulating cleaning fluid reach 300～500mg/L;
3) the beginning first step is cleaned, and cleaning temperature is controlled at 35～40 ℃, cleans flow and is set at identically with actual operating mode, and scavenging period is 1～2 hour, clean finish after with the cleaning fluid emptying;
4) repeating step 1), blue star LX-056A/B, disodium ethylene diamine tetraacetate and Sodium Polyacrylate are added in the wash cycles water tank successively, make the concentration of blue star LX-056A/B in circulating cleaning fluid reach 500～700mg/L, the concentration of disodium ethylene diamine tetraacetate in circulating cleaning fluid reaches 200～250mg/L, the concentration of Sodium Polyacrylate in circulating cleaning fluid reaches 20～25mg/L, mixes; Treat that solution-stabilized back adds clorox and is stirred to abundant mixing, the dosage of clorox makes the decontaminant concentration of circulating cleaning fluid reach 100～150mg/L;
5) second step of beginning cleans, and cleaning temperature is controlled at 35～40 ℃, cleans flow and is set at identically with actual operating mode, and scavenging period is 1～2 hour, clean finish after with the cleaning fluid emptying.
2. according to the cleaning method on the throne of the town regenerated water plate type heat exchanger described in the claim 1, it is characterized in that: the cleaning frequency on the throne is 5～20 days.
3. according to the cleaning method on the throne of the town regenerated water plate type heat exchanger described in the claim 2, it is characterized in that the cleaning frequency on the throne in summer is 5 days, the cleaning frequency on the throne in winter is 7 days.
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| CN114199074A (en) * | 2021-11-12 | 2022-03-18 | 江阴金童石化装备有限公司 | Heat exchanger rust removal system and rust removal process |
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2008
- 2008-01-23 CN CN200810056618A patent/CN100582640C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353299A (en) * | 2011-08-09 | 2012-02-15 | 清华大学 | Device and method for restraining and eliminating dirt of recycled water plate heat exchanger on line |
| CN102353299B (en) * | 2011-08-09 | 2013-04-17 | 清华大学 | Device and method for restraining and eliminating dirt of recycled water plate heat exchanger on line |
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| Publication number | Publication date |
|---|---|
| CN101221027A (en) | 2008-07-16 |
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