CN113251852A - Chemical cleaning system and method for micro-channel heat exchanger - Google Patents
Chemical cleaning system and method for micro-channel heat exchanger Download PDFInfo
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- CN113251852A CN113251852A CN202110638937.1A CN202110638937A CN113251852A CN 113251852 A CN113251852 A CN 113251852A CN 202110638937 A CN202110638937 A CN 202110638937A CN 113251852 A CN113251852 A CN 113251852A
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- 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
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- 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
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Abstract
The invention discloses a chemical cleaning system and a chemical cleaning method for a microchannel heat exchanger, wherein the system comprises a heat exchanger process pipeline, a cleaning agent circulating system and a compressed air system, dirt is dissolved and stripped by using a chemical cleaning agent and is removed, the system is convenient to operate and high in cleaning efficiency, and the chemical cleaning by adopting the method is beneficial to improving the heat efficiency of the microchannel heat exchanger and prolonging the service life of the microchannel heat exchanger.
Description
Technical Field
The invention belongs to the technical field of heat exchange devices, and particularly relates to a chemical cleaning system and method for a micro-channel heat exchanger.
Background
The microchannel heat exchanger adopts tens of thousands of tiny (millimeter-scale) channels as heat exchange medium flow channels, has the advantages of excellent enhanced heat transfer effect, compact structure, high temperature resistance, high pressure resistance, safety, reliability and the like, and is widely applied to the fields of refrigeration and air conditioning, petroleum and natural gas, nuclear industry, chemical industry, electric power industry and the like.
Due to the adoption of a channel structure with a micro scale, the heat exchanger often has the problem of local scale deposition and blockage of the micro channel in the operation process, and the heat transfer capacity of equipment is greatly reduced and the flow resistance is greatly improved when the blockage is serious, so that the operation cost of the equipment is increased, the service life of the equipment is shortened, and the normal operation of a process system where the equipment is located is also seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a chemical cleaning system and a chemical cleaning method for a microchannel heat exchanger, which can remove dirt deposition and blockage formed in an internal channel of the microchannel heat exchanger and ensure the reliable and stable operation of the heat exchanger.
In order to achieve the purpose, the invention adopts the following technical scheme:
a chemical cleaning system for a micro-channel heat exchanger comprises a heat exchanger process pipeline, a cleaning agent circulating system and a compressed air system;
the heat exchanger process pipeline comprises a first high-temperature medium pipeline 3a, a first high-temperature medium short pipe 2a, a first high-temperature medium interface section 1a, a second high-temperature medium interface section 1b, a second high-temperature medium short pipe 2b, a second high-temperature medium pipeline 3b, a first low-temperature medium pipeline 3c, a first low-temperature medium short pipe 2c, a first low-temperature medium interface section 1c, a second low-temperature medium interface section 1d, a second low-temperature medium short pipe 2d, a second low-temperature medium pipeline 3d, a first high-temperature medium pressure sensor 8, a second high-temperature medium pressure sensor 8, a first high-temperature medium pressure guide pipe 7, a second high-temperature medium pressure sensor 8 and a second high-temperature medium pressure sensor, wherein the first high-temperature medium pipeline 3a, the first high-temperature medium interface section 1a, the second high-temperature medium short pipe 1a, the second high-temperature medium interface section 1b, the second high-temperature medium pipeline 1c, the first low-temperature medium interface section, the first low-temperature medium pipeline 1c, the first low-temperature medium interface section, the second low-temperature medium interface section 1c, the second low-temperature medium interface section, the second low-temperature medium pipeline 1c, the second low-temperature medium pressure sensor, the second low-temperature medium pipe, the second low-temperature medium pressure sensor, the second high-temperature medium pipe, the second low-temperature medium pressure sensor, the second high-temperature medium pressure pipe, the second high-temperature medium pressure sensor, the second high-temperature medium pipe, the first low-temperature medium, A second high-temperature medium pressure sensor 12 provided on a second high-temperature medium pressure pipe 14 communicating with the second high-temperature medium interface section 1b, a first low-temperature medium pressure sensor 17 provided on a first low-temperature medium pressure pipe 16 communicating with the first low-temperature medium interface section 1c, a second low-temperature medium pressure sensor 11 provided on a second low-temperature medium pressure pipe 9 communicating with the second low-temperature medium interface section 1d, a high-temperature medium side air pipe 4 communicating with the first high-temperature medium interface section 1a, and a low-temperature medium side air pipe 18 communicating with the first low-temperature medium interface section 1 c;
the cleaning agent circulating system comprises a cleaning agent storage tank 22 and a first cleaning agent pipeline 26 which are communicated in sequence, a cleaning agent circulating pump 27 and a second cleaning agent pipeline 28, wherein the outlet of the second cleaning agent pipeline 28 is communicated with the joint of the first high-temperature medium interface section mating flange 37 or the first low-temperature medium interface section mating flange 46, the inlet of the cleaning agent blow-off pipeline 30 is communicated with the second cleaning agent pipeline 28, the outlet of the cleaning agent blow-off pipeline 30 is communicated with the inlet of the blow-off tank 34, the inlets of the third cleaning agent pipeline 40 and the fourth cleaning agent pipeline 42 are respectively communicated with the second cleaning agent pipeline 28, the outlets of the third cleaning agent pipeline 40 and the fourth cleaning agent pipeline 42 are respectively communicated with the fifth cleaning agent pipeline 39, the inlet of the fifth cleaning agent pipeline 39 is communicated with the joint of the second high-temperature medium interface section mating flange 44 or the second low-temperature medium interface section mating flange 47, and the outlet of the fifth cleaning agent pipeline 39 is communicated with the inlet of the cleaning agent storage tank 22;
the compressed air system comprises an air compressor 48, a first air pipeline 49, an air storage tank 50, a second air pipeline 51, an air dryer 53, a third air pipeline 54, an air heater 55, a fourth air pipeline 56 and a compressed air hose 58 which are connected in sequence;
a first high-temperature medium root valve 6 is arranged on the first high-temperature medium pressure guide pipe 7, a second high-temperature medium root valve 13 is arranged on the second high-temperature medium pressure guide pipe 14, a first low-temperature medium root valve 15 is arranged on the first low-temperature medium pressure guide pipe 16, a second low-temperature medium root valve 10 is arranged on the second low-temperature medium pressure guide pipe 9, a high-temperature medium side air block valve 5 is arranged on the high-temperature medium side air pipeline 4, and a low-temperature medium side air block valve 19 is arranged on the low-temperature medium side air pipeline 18;
a storage tank blow-off valve 21 is arranged on the storage tank blow-off pipeline 20, a first cleaning agent cut-off valve 25 is arranged on the first cleaning agent pipeline 26, a second cleaning agent cut-off valve 29 and a third cleaning agent cut-off valve 36 are respectively arranged on two sides of an inlet of a third cleaning agent pipeline 40 on the second cleaning agent pipeline 28, a cleaning agent blow-off valve 31 is arranged on the cleaning agent blow-off pipeline 30, a blow-off tank blow-off valve 33 is arranged on the blow-off tank blow-off pipeline 32, a fourth cleaning agent cut-off valve 41 is arranged on the third cleaning agent pipeline 40, a fifth cleaning agent cut-off valve 43 is arranged on the fourth cleaning agent pipeline 42, and a sixth cleaning agent cut-off valve 45 and a seventh cleaning agent cut-off valve 38 are respectively arranged on two sides of an outlet of the fourth cleaning agent pipeline 42 on the fifth cleaning agent pipeline 39.
Preferably, the first high-temperature medium short pipe 2a, the second high-temperature medium short pipe 2b, the first low-temperature medium short pipe 2c and the second low-temperature medium short pipe 2d are all connected by flanges so as to be convenient to detach.
Preferably, the cleaning agent storage tank 22 is provided with an inlet, an outlet, a drain outlet and a filter screen, wherein the inlet is an open type opening, the drain outlet is communicated with the storage tank drain pipeline 20, and the storage tank filter screen 23 is arranged along the cross section direction of the storage tank and separates the inlet from the outlet and the drain outlet; the cleaning agent circulating pump 27 is a corrosion-resistant liquid pump, and the cleaning agent circulating pump 27 is provided with a standby pump; the sewage draining groove 34 is provided with an inlet, a sewage draining outlet and a filter screen, wherein the inlet is an open type opening, the sewage draining outlet is communicated with a sewage draining pipeline 32 of the sewage draining groove, and the filter screen 35 of the sewage draining groove is arranged along the cross section direction of the sewage draining groove and separates the inlet from the sewage draining outlet;
the cleaning agent storage tank 22 is filled with a cleaning agent 24, preferably, the cleaning agent 24 is composed of acid, corrosion inhibitor and water, different acid and corrosion inhibitor are adopted according to different materials of the micro-channel heat exchanger, chemical compositions and deposition states of dirt in the channel and the quantity of the dirt, the acid is one of hydrochloric acid, sulfuric acid, sulfamic acid, hydrofluoric acid, citric acid, nitric acid, ethylene diamine tetraacetic acid and nitrilotriacetic acid, and the corrosion inhibitor is one of high-grade pyridine base, Lan-826, nitroaniline, furfural, trithiocarbonate, alkyl benzyl pyridine chloride, Lan-5, quinoline, urotropine, ethyl quinoline iodide, diethyl thiourea and chlorhexidine.
Preferably, the second air duct 51 is provided with a filter 52, and the fourth air duct 56 is provided with a main air shut-off valve 57.
The cleaning method of the chemical cleaning system of the micro-channel heat exchanger comprises the following steps:
step 1: preparation work: the first high-temperature medium short pipe 2a, the second high-temperature medium short pipe 2b, the first low-temperature medium short pipe 2c and the second low-temperature medium short pipe 2d are dismantled, and a first high-temperature medium interface section mating flange 37, a second high-temperature medium interface section mating flange 44, a first low-temperature medium interface section mating flange 46 and a second low-temperature medium interface section mating flange 47 are installed;
step 2: hydraulic cleaning: the outlet of the second cleaning agent pipeline 28 is communicated with the joint of the first high-temperature medium interface section mating flange 37, the inlet of the fifth cleaning agent pipeline 39 is communicated with the joint of the second high-temperature medium interface section mating flange 44, the cleaning agent storage tank 22 is filled with clear water, the storage tank drain valve 21, the drain tank drain valve 33, the cleaning agent drain valve 31, the high-temperature medium side air block valve 5 and the low-temperature medium side air block valve 19 are closed, a fourth cleaning agent block valve 41 and a fifth cleaning agent block valve 43 are opened, the first cleaning agent block valve 25, the second cleaning agent block valve 29, the third cleaning agent block valve 36, the sixth cleaning agent block valve 45 and the seventh cleaning agent block valve 38 are opened, the cleaning agent circulating pump 27 is started to establish water circulation, a leakage point of the system is checked and treated, a hydraulic pressure test is completed, and then the system equipment and pipelines are washed by the water circulation until no dirt is observed in water flow at the inlet of the cleaning agent storage tank 22;
and step 3: alkali washing: maintaining water circulation and slowly adding an alkali detergent into the clean water in the detergent storage tank 22 until the alkali concentration is 0.5-1.5%, keeping forward circulation alkali cleaning, namely, from the inlet of the high-temperature medium channel of the micro-channel heat exchanger to the outlet of the high-temperature medium channel until no dirt is observed in the water flow at the inlet of the detergent storage tank 22, opening the fourth detergent cut-off valve 41 and the fifth detergent cut-off valve 43, closing the third detergent cut-off valve 36 and the sixth detergent cut-off valve 45, keeping reverse circulation alkali cleaning, namely, stopping the detergent circulating pump 27 after no dirt is observed in the water flow from the outlet of the high-temperature medium channel of the micro-channel heat exchanger to the inlet of the detergent storage tank 22, communicating the outlet of the compressed air hose 58 with the inlet of the high-temperature medium side air pipeline 4, opening the third detergent cut-off valve 36, the sixth detergent cut-off valve 45 and the storage tank 21, Cleaning agent blow-down valve 31, blow-down tank blow-down valve 33, high temperature medium side air block valve 5 and main pipe air block valve 57, starting air compressor 48, utilizing compressed air to completely discharge the system alkaline washing waste liquid from storage tank blow-down pipe 20 and blow-down tank blow-down pipe 32, stopping air compressor 48, performing hydraulic cleaning on the system according to step 2, and then introducing compressed air to completely discharge cleaning waste water;
and 4, step 4: acid washing: injecting clean water into the cleaning agent storage tank 22 and starting the cleaning agent circulating pump 27, establishing and maintaining system circulation, quantitatively adding corrosion inhibitor into the cleaning agent storage tank 22, circulating for a period of time to enable the corrosion inhibitor to be dissolved uniformly and circulate uniformly, slowly adding acid into the cleaning agent storage tank 22 to a set concentration, opening the third cleaning agent block valve 36 and the sixth cleaning agent block valve 45, closing the fourth cleaning agent block valve 41 and the fifth cleaning agent block valve 43, keeping the cleaning agent in forward circulation, observing the water quality change at the inlet of the cleaning agent storage tank 22, observing the pressure difference value of the first high-temperature medium pressure sensor 8 and the second high-temperature medium pressure sensor 12, when no new dirt exists in the cleaning agent at the inlet of the cleaning agent storage tank 22 and the pressure difference value of the first high-temperature medium pressure sensor 8 and the second high-temperature medium pressure sensor 12 is kept unchanged, opening the fourth cleaning agent block valve 41 and the fifth cleaning agent block valve 43, closing the third cleaning agent stop valve 36 and the sixth cleaning agent stop valve 45, and repeating the processes to complete reverse cycle acid cleaning;
and 5: and (3) post-treatment: the method comprises the following steps of (1) discharging acid pickling waste liquid in a system completely by adopting the method in the step (3), carrying out hydraulic cleaning on the system by adopting the method in the step (2), then quantitatively adding a passivating agent into a cleaning agent storage tank (22), keeping normal circulation for 4-60 hours, stopping running a cleaning agent circulating pump (27), discharging passivation waste liquid in the system completely by adopting the method in the step (3), starting a compressed air system, introducing clean and dry hot air from an air pipeline (4) at the high-temperature medium side to sweep and remove residual moisture in the cleaning system, properly collecting solid impurities filtered out from a storage tank filter screen (23) and a sewage draining tank filter screen (35), and carrying out harmless treatment according to the environmental protection requirement;
step 6: communicating the outlet of the second cleaning agent pipeline 28 with the joint of the first low-temperature medium interface section companion flange 46, communicating the inlet of the fifth cleaning agent pipeline 39 with the joint of the second low-temperature medium interface section companion flange 47, and repeating the steps 1-5 to complete chemical cleaning of the low-temperature medium side channel of the micro-channel heat exchanger;
and 7: and (3) removing the first high-temperature medium interface section mating flange 37, the second high-temperature medium interface section mating flange 44, the first low-temperature medium interface section mating flange 46 and the second low-temperature medium interface section mating flange 47, installing the first high-temperature medium short pipe 2a, the second high-temperature medium short pipe 2b, the first low-temperature medium short pipe 2c and the second low-temperature medium short pipe 2d, and finishing the chemical cleaning operation.
Preferably, the alkali wash is NaOH aqueous solution or Na2CO3Aqueous solution of (A) or (Na)3PO4An aqueous solution of (a).
Preferably, the passivating agent is an aqueous solution of hydrazine, an aqueous solution of sodium nitrite, an aqueous solution of triethanolamine or an aqueous solution of sodium phosphate.
The chemical cleaning system and the chemical cleaning method for the micro-channel heat exchanger provided by the invention have the beneficial effects that the chemical cleaning agent is used for dissolving and stripping dirt to be removed, and the chemical cleaning system and the chemical cleaning method have the following beneficial effects:
1) the operation is convenient, and the heat exchange equipment does not need to be disassembled.
2) The cleaning effect is uniform, and the small and complex structure can be cleaned.
3) High cleaning efficiency and low labor intensity.
4) The efficiency of the heat exchanger is improved, and the service life of the heat exchanger is prolonged.
Drawings
FIG. 1 is a schematic view of a process tube for a heat exchanger according to the present invention.
FIG. 2 is a schematic view of the connection between the cleaning agent circulation system and the high-temperature medium side channel of the heat exchanger.
FIG. 3 is a schematic view of the connection between the cleaning agent circulation system and the low-temperature medium side channel of the heat exchanger.
FIG. 4 is a schematic view of a compressed air system according to the present invention.
Wherein, 1 is a micro-channel heat exchanger, 1a is a first high-temperature medium interface section, 1b is a second high-temperature medium interface section, 1c is a first low-temperature medium interface section, 1d is a second low-temperature medium interface section, 2a is a first high-temperature medium short pipe, 2b is a second high-temperature medium short pipe, 2c is a first low-temperature medium short pipe, 2d is a second low-temperature medium short pipe, 3a is a first high-temperature medium pipeline, 3b is a second high-temperature medium pipeline, 3c is a first low-temperature medium pipeline, 3d is a second low-temperature medium pipeline, 4 is a high-temperature medium side air pipeline, 5 is a high-temperature medium side air block valve, 6 is a first high-temperature medium root valve, 7 is a first high-temperature medium pressure pipe, 8 is a first high-temperature medium pressure sensor, 9 is a second low-temperature medium pressure pipe, 10 is a second low-temperature medium root valve, 11 is a second low-temperature medium pressure sensor, 12 is a second high-temperature medium pressure sensor, 13 is a second high-temperature medium root valve, 14 is a second high-temperature medium pressure guide pipe, 15 is a first low-temperature medium root valve, 16 is a first low-temperature medium pressure guide pipe, 17 is a first low-temperature medium pressure sensor, 18 is a low-temperature medium side air pipeline, 19 is a low-temperature medium side air stop valve, 20 is a storage tank sewage discharge pipeline, 21 is a storage tank sewage discharge valve, 22 is a cleaning agent storage tank, 23 is a storage tank filter screen, 24 is a cleaning agent, 25 is a first cleaning agent stop valve, 26 is a first cleaning agent pipeline, 27 is a cleaning agent circulating pump, 28 is a second cleaning agent pipeline, 29 is a second cleaning agent stop valve, 30 is a cleaning agent sewage discharge pipeline, 31 is a sewage discharge valve, 32 is a sewage discharge tank sewage discharge pipeline, 33 is a sewage discharge tank sewage discharge valve, 34 is a sewage discharge tank, 35 is a sewage discharge tank filter screen, 36 is a third cleaning agent stop valve, 37 is a first high-temperature medium interface section mating flange, 38 is a seventh cleaning agent block valve, 39 is a fifth cleaning agent pipeline, 40 is a third cleaning agent pipeline, 41 is a fourth cleaning agent block valve, 42 is a fourth cleaning agent pipeline, 43 is a fifth cleaning agent block valve, 44 is a second high-temperature medium interface section companion flange, 45 is a sixth cleaning agent block valve, 46 is a first low-temperature medium interface section companion flange, 47 is a second low-temperature medium interface section companion flange, 48 is an air compressor, 49 is a first air pipeline, 50 is an air storage tank, 51 is a second air pipeline, 52 is a filter, 53 is an air dryer, 54 is a third air pipeline, 55 is an air heater, 56 is a fourth air pipeline, 57 is a main pipe air block valve, and 58 is a compressed air hose.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 4, the chemical cleaning system for the micro-channel heat exchanger of the invention comprises a heat exchanger process pipeline, a cleaning agent circulation system and a compressed air system.
Wherein, the heat exchanger process pipeline comprises a first high temperature medium pipeline 3a, a first high temperature medium short pipe 2a, a first high temperature medium interface section 1a, a second high temperature medium interface section 1b, a second high temperature medium short pipe 2b, a second high temperature medium pipeline 3b, a first low temperature medium pipeline 3c, a first low temperature medium short pipe 2c, a first low temperature medium interface section 1c, a second low temperature medium interface section 1d, a second low temperature medium short pipe 2d and a second low temperature medium pipeline 3d, wherein the outlet of the first high temperature medium pipeline 3a is communicated with the inlet of the first high temperature medium short pipe 2a, the outlet of the first high temperature medium short pipe 2a is communicated with the inlet of the first high temperature medium interface section 1a, the outlet of the first high temperature medium interface section 1a is communicated with the inlet of the high temperature medium channel of the micro-channel heat exchanger, the outlet of the high temperature medium channel of the micro-channel heat exchanger is communicated with the inlet of the second high temperature medium interface section 1b, an outlet of the second high-temperature medium interface section 1b is communicated with an inlet of a second high-temperature medium short pipe 2b, an outlet of the second high-temperature medium short pipe 2b is communicated with an inlet of a second high-temperature medium pipeline 3b, an outlet of a first low-temperature medium pipeline 3c is communicated with an inlet of a first low-temperature medium short pipe 2c, an outlet of the first low-temperature medium short pipe 2c is communicated with an inlet of the first low-temperature medium interface section 1c, an outlet of the first low-temperature medium interface section 1c is communicated with an inlet of a low-temperature medium channel of the micro-channel heat exchanger, an outlet of the low-temperature medium channel of the micro-channel heat exchanger is communicated with an inlet of a second low-temperature medium interface section 1d, an outlet of the second low-temperature medium interface section 1d is communicated with an inlet of a second low-temperature medium short pipe 2d, and an outlet of the second low-temperature medium short pipe 2d is communicated with an inlet of a second low-temperature medium pipeline 3 d.
The heat exchanger process pipeline also comprises a first high-temperature medium pressure sensor 8, a second high-temperature medium pressure sensor 12, a first low-temperature medium pressure sensor 17, a second low-temperature medium pressure sensor 11, a high-temperature medium side air pipeline 4 and a low-temperature medium side air pipeline 18, wherein the first high-temperature medium pressure sensor 8 is arranged on a first high-temperature medium pressure guide pipe 7 communicated with the first high-temperature medium interface section 1a, the second high-temperature medium pressure sensor 12 is arranged on a second high-temperature medium pressure guide pipe 14 communicated with the second high-temperature medium interface section 1b, the first low-temperature medium pressure sensor 17 is arranged on a first low-temperature medium pressure guide pipe 16 communicated with the first low-temperature medium interface section 1c, the second low-temperature medium pressure sensor 11 is arranged on a second low-temperature medium pressure guide pipe 9 communicated with the second low-temperature medium interface section 1d, the high-temperature medium side air pipeline 4 is communicated with the first high-temperature medium interface section 1a, the low-temperature medium side air pipeline 18 is communicated with the first low-temperature medium interface section 1c, a first high-temperature medium root valve 6 is arranged on the first high-temperature medium pressure guide pipe 7, a second high-temperature medium root valve 13 is arranged on the second high-temperature medium pressure guide pipe 14, a first low-temperature medium root valve 15 is arranged on the first low-temperature medium pressure guide pipe 16, a second low-temperature medium root valve 10 is arranged on the second low-temperature medium pressure guide pipe 9, a high-temperature medium side air block valve 5 is arranged on the high-temperature medium side air pipeline 4, and a low-temperature medium side air block valve 19 is arranged on the low-temperature medium side air pipeline 18.
The cleaning agent circulating system comprises a cleaning agent storage tank 22, a first cleaning agent pipeline 26, a cleaning agent circulating pump 27, a second cleaning agent pipeline 28, a first high-temperature medium interface section mating flange 37, a first low-temperature medium interface section mating flange 46, a cleaning agent blow-down pipeline 30, a blow-down tank 34, a third cleaning agent pipeline 40, a fourth cleaning agent pipeline 42, a fifth cleaning agent pipeline 39, a second high-temperature medium interface section mating flange 44 and a second low-temperature medium interface section mating flange 47, wherein an outlet of the cleaning agent storage tank 22 is communicated with an inlet of the first cleaning agent pipeline 26, an outlet of the first cleaning agent pipeline 26 is communicated with an inlet of the cleaning agent circulating pump 27, an outlet of the cleaning agent circulating pump 27 is communicated with an inlet of the second cleaning agent pipeline 28, an outlet of the second cleaning agent pipeline 28 is communicated with a joint of the first high-temperature medium interface section mating flange 37 or the first low-temperature medium interface section mating flange, the inlet of the cleaning agent sewage pipeline 30 is communicated with the second cleaning agent pipeline 28, the outlet of the cleaning agent sewage pipeline 30 is communicated with the inlet of the sewage discharge groove 34, the inlets of the third cleaning agent pipeline 40 and the fourth cleaning agent pipeline 42 are respectively communicated with the second cleaning agent pipeline 28, the outlets of the third cleaning agent pipeline 40 and the fourth cleaning agent pipeline 42 are respectively communicated with the fifth cleaning agent pipeline 39, the inlet of the fifth cleaning agent pipeline 39 is communicated with the joint of the second high-temperature medium joint section mating flange 44 or the second low-temperature medium joint section mating flange 47, and the outlet of the fifth cleaning agent pipeline 39 is communicated with the inlet of the cleaning agent storage tank 22.
The cleaning agent storage tank 22 is provided with an inlet, an outlet, a drain outlet and a filter screen, wherein the inlet is an open type opening, the drain outlet is communicated with a storage tank drain pipeline 20, and the storage tank filter screen 23 is arranged along the cross section direction of the storage tank and separates the inlet from the outlet and the drain outlet; the cleaning agent circulating pump 27 is a corrosion-resistant liquid pump, and the cleaning agent circulating pump 27 is provided with 1 standby pump; the sewage draining groove 34 is provided with an inlet, a sewage draining outlet and a filter screen, wherein the inlet is an open type opening, the sewage draining outlet is communicated with a sewage draining pipeline 32 of the sewage draining groove, and the filter screen 35 is arranged along the cross section direction of the sewage draining groove and separates the inlet from the sewage draining outlet; the first high-temperature medium interface section mating flange 37, the second high-temperature medium interface section mating flange 44, the first low-temperature medium interface section mating flange 46 and the second low-temperature medium interface section mating flange 47 are all provided with joints so as to be connected with a cleaning agent pipeline; a storage tank blow-off valve 21 is arranged on the storage tank blow-off pipeline 20, a first cleaning agent cut-off valve 25 is arranged on the first cleaning agent pipeline 26, a second cleaning agent cut-off valve 29 and a third cleaning agent cut-off valve 36 are respectively arranged on two sides of an inlet of a third cleaning agent pipeline 40 on the second cleaning agent pipeline 28, a cleaning agent blow-off valve 31 is arranged on the cleaning agent blow-off pipeline 30, a blow-off groove blow-off valve 33 is arranged on the blow-off groove blow-off pipeline 32, a fourth cleaning agent cut-off valve 41 is arranged on the third cleaning agent pipeline 40, a fifth cleaning agent cut-off valve 43 is arranged on the fourth cleaning agent pipeline 42, and a sixth cleaning agent cut-off valve 45 and a seventh cleaning agent cut-off valve 38 are respectively arranged on two sides of an outlet of the fifth cleaning agent pipeline 39 which is arranged on the fourth cleaning agent pipeline 42.
When the outlet of the second cleaning agent pipeline 28 is communicated with the joint of the first high-temperature medium interface section companion flange 37 and the inlet of the fifth cleaning agent pipeline 39 is communicated with the joint of the second high-temperature medium interface section companion flange 44, the cleaning agent circularly flows into the high-temperature medium side channel of the microchannel heat exchanger to carry out chemical cleaning; when the outlet of the second cleaning agent pipeline 28 is communicated with the joint of the first low-temperature medium interface section mating flange 46 and the inlet of the fifth cleaning agent pipeline 39 is communicated with the joint of the second low-temperature medium interface section mating flange 47, the cleaning agent circularly flows into the low-temperature medium side channel of the micro-channel heat exchanger to carry out chemical cleaning.
The cleaning agent 24 mainly comprises acid, corrosion inhibitor and water, different acid and corrosion inhibitor are adopted according to different materials of the micro-channel heat exchanger, chemical compositions of dirt in the channel, deposition states and dirt amount, common acid comprises one of hydrochloric acid, sulfuric acid, sulfamic acid, hydrofluoric acid, citric acid, nitric acid, ethylene diamine tetraacetic acid and nitrilotriacetic acid, and common corrosion inhibitor comprises one of higher pyridine base, Lan-826, nitroaniline, furfural, trithiocarbonate, alkyl benzyl pyridine chloride, Lan-5, quinoline, urotropine, ethyl quinoline iodide, diethyl thiourea and dibutyl.
The compressed air system comprises an air compressor 48, a first air pipeline 49, an air storage tank 50, a second air pipeline 51, an air dryer 53, a third air pipeline 54, an air heater 55, a fourth air pipeline 56 and a compressed air hose 58 which are connected in sequence, wherein a filter 52 is arranged on the second air pipeline 51, and a main pipe air cut-off valve 57 is arranged on the fourth air pipeline 56.
The chemical cleaning method of the micro-channel heat exchanger comprises the following steps:
step 1: preparation work: the first high-temperature medium short pipe 2a, the second high-temperature medium short pipe 2b, the first low-temperature medium short pipe 2c and the second low-temperature medium short pipe 2d are dismantled, and a first high-temperature medium interface section mating flange 37, a second high-temperature medium interface section mating flange 44, a first low-temperature medium interface section mating flange 46 and a second low-temperature medium interface section mating flange 47 are installed;
step 2: hydraulic cleaning: the outlet of the second cleaning agent pipeline 28 is communicated with the joint of the first high-temperature medium interface section mating flange 37, the inlet of the fifth cleaning agent pipeline 39 is communicated with the joint of the second high-temperature medium interface section mating flange 44, the cleaning agent storage tank 22 is filled with clear water, the storage tank drain valve 21, the drain tank drain valve 33, the cleaning agent drain valve 31, the high-temperature medium side air block valve 5 and the low-temperature medium side air block valve 19 are closed, a fourth cleaning agent block valve 41 and a fifth cleaning agent block valve 43 are opened, the first cleaning agent block valve 25, the second cleaning agent block valve 29, the third cleaning agent block valve 36, the sixth cleaning agent block valve 45 and the seventh cleaning agent block valve 38 are opened, the cleaning agent circulating pump 27 is started to establish water circulation, a leakage point of the system is checked and treated, a hydraulic pressure test is completed, and then the system equipment and pipelines are washed by the water circulation until no dirt is observed in water flow at the inlet of the cleaning agent storage tank 22;
and step 3: alkali washing: maintaining water circulation and slowly adding alkaline detergent (NaOH, Na) into the clear water in the detergent storage tank 222CO3、Na3PO4Etc.) until the alkali concentration is between 0.5% and 1.5%, keeping the forward circulation (from the inlet of the high-temperature medium channel of the micro-channel heat exchanger to the outlet of the high-temperature medium channel) of alkali washing until no dirt is observed in the water flow at the inlet of the cleaning agent storage tank 22, opening the fourth cleaning agent block valve 41 and the fifth cleaning agent block valve 43, closing the third cleaning agent block valve 36 and the sixth cleaning agent block valve 45, keeping the reverse circulation (from the outlet of the high-temperature medium channel of the micro-channel heat exchanger to the inlet of the high-temperature medium channel) of alkali washing until no dirt is observed in the water flow at the inlet of the cleaning agent storage tank 22, stopping the cleaning agent circulation pump 27, and enabling the alkali washing machine to be in a reverse circulation (from the outlet of the high-temperature medium channel of the micro-channel heat exchanger to the inlet of the high-temperature medium channel) until no dirt is observed in the water flow at the inlet of the cleaning agent storage tank 22, so as to enable the alkali concentration to be between 0.5% and 1.5%The outlet of the compressed air hose 58 is communicated with the inlet of the high-temperature medium side air pipeline 4, the third cleaning agent block valve 36, the sixth cleaning agent block valve 45, the storage tank blow-down valve 21, the cleaning agent blow-down valve 31, the blow-down tank blow-down valve 33, the high-temperature medium side air block valve 5 and the main pipe air block valve 57 are opened, the air compressor 48 is started, the system alkali cleaning waste liquid is discharged completely from the storage tank blow-down pipeline 20 and the blow-down tank blow-down pipeline 32 by using compressed air, the air compressor 48 is stopped, and the system is subjected to hydraulic cleaning according to the step 2 and then is fed with compressed air to clean the cleaning waste water;
and 4, step 4: acid washing: injecting clean water into the cleaning agent storage tank 22 and starting the cleaning agent circulating pump 27, establishing and maintaining system circulation, quantitatively adding corrosion inhibitor into the cleaning agent storage tank 22, circulating for a period of time to enable the corrosion inhibitor to be dissolved uniformly and circulate uniformly, slowly adding acid into the cleaning agent storage tank 22 to a set concentration, opening the third cleaning agent block valve 36 and the sixth cleaning agent block valve 45, closing the fourth cleaning agent block valve 41 and the fifth cleaning agent block valve 43, keeping the cleaning agent in forward circulation, observing the water quality change at the inlet of the cleaning agent storage tank 22, observing the pressure difference value of the first high-temperature medium pressure sensor 8 and the second high-temperature medium pressure sensor 12, when no new dirt exists in the cleaning agent at the inlet of the cleaning agent storage tank 22 and the pressure difference value of the first high-temperature medium pressure sensor 8 and the second high-temperature medium pressure sensor 12 is kept unchanged, opening the fourth cleaning agent block valve 41 and the fifth cleaning agent block valve 43, closing the third cleaning agent stop valve 36 and the sixth cleaning agent stop valve 45, and repeating the processes to complete reverse cycle acid cleaning;
and 5: and (3) post-treatment: the method of step 3 is adopted to discharge the pickling waste liquid in the system completely, the method of step 2 is adopted to carry out hydraulic cleaning on the system, then the passivating agents (hydrazine, sodium nitrite, triethanolamine, sodium phosphate and the like) are quantitatively added into the cleaning agent storage tank 22, the normal circulation is kept for 4-60 hours, then the cleaning agent circulating pump 27 is stopped, the method of step 3 is adopted to discharge the passivation waste liquid in the system completely, the compressed air system is started, clean and dry hot air is introduced from the high-temperature medium side air pipeline 4 to sweep and remove residual moisture in the cleaning system, and solid impurities filtered out from the storage tank filter screen 23 and the sewage disposal tank filter screen 35, as well as the alkaline washing waste liquid, the pickling waste liquid and the passivation waste liquid are properly collected and subjected to harmless treatment according to the environmental protection requirement;
step 6: communicating the outlet of the second cleaning agent pipeline 28 with the joint of the first low-temperature medium interface section companion flange 46, communicating the inlet of the fifth cleaning agent pipeline 39 with the joint of the second low-temperature medium interface section companion flange 47, and repeating the steps 1-5 to complete chemical cleaning of the low-temperature medium side channel of the micro-channel heat exchanger;
and 7: and (3) removing the first high-temperature medium interface section mating flange 37, the second high-temperature medium interface section mating flange 44, the first low-temperature medium interface section mating flange 46 and the second low-temperature medium interface section mating flange 47, installing the first high-temperature medium short pipe 2a, the second high-temperature medium short pipe 2b, the first low-temperature medium short pipe 2c and the second low-temperature medium short pipe 2d, and finishing the chemical cleaning operation.
In the invention, the dirt on the heat transfer surface is dissolved and stripped by a chemical method to be removed; the hydraulic flushing has the functions of checking system leakage, removing loose dirt and removing residual alkaline washing liquid or acid washing liquid of the system; the alkaline washing has the functions of removing organic matters poisoning cleaning agents in the system and loosening a scale layer; the acid cleaning function is to dissolve, loosen and remove dirt by using the cleaning agent, the acid in the cleaning agent is to react with the dirt to generate a substance which is easy to dissolve in water, and the corrosion inhibitor in the cleaning agent is to reduce the corrosion of the acid to the metal matrix and protect equipment; the acid cleaning descaling activates the surface of the equipment, so that the equipment is easy to rust or corrode, and the passivating agent has the function of chemically reacting with the metal surface activated after acid cleaning to form a passivating film so as to protect the equipment; the compressed air is used for blowing and carrying out residual moisture in the system, and the air heater is used for increasing the temperature of the compressed air and improving the blowing efficiency; the short pipe of high and low temperature medium is used to provide process interface and operation space for chemical cleaning, and the length of the short pipe is determined according to the process operation requirement.
Example one
The heat regenerator in the supercritical carbon dioxide Brayton cycle is a micro-channel heat exchanger, and high-temperature and low-temperature media of the heat exchanger are both supercritical carbon dioxideThe inlet parameters of the high-temperature medium are 8.5MPa and 500 ℃, the inlet parameters of the low-temperature medium are 21MPa and 250 ℃, the material of the heat exchanger is 304 stainless steel, and the main component of the scale in the micro-channel of the heat regenerator is iron rust; the cleaning agent circulating pump adopts a corrosion-resistant centrifugal pump, the total lift is 1MPa, the total flow is 2000L/min, the pump overflowing part adopts corrosion-resistant engineering plastics (glass fiber reinforced polypropylene), and 1 standby pump is arranged; the block valve and the root valve in the cleaning system are both corrosion-resistant fluorine (polytetrafluoroethylene) lined valves, the pipelines of the cleaning system are all rubber pipes, the four companion flanges are made of 304 stainless steel, and the cleaning agent storage tank and the sewage draining tank are made of polyethylene; the cleaning agent consists of water, nitric acid and a corrosion inhibitor Lan-826, wherein the concentration of the nitric acid is 10 wt%, the concentration of the Lan-826 is 0.25 wt%, and the alkaline cleaning agent consists of water and NaOH, wherein the concentration of the NaOH is 1 wt%; compressed air parameter of 7.5Nm3Min, 0.8MPa, 80 ℃; the 4 short pipes 2a, 2b, 2c and 2d are 500mm long, DN150 in diameter and made of 20# steel.
Claims (8)
1. A chemical cleaning system for a micro-channel heat exchanger is characterized by comprising a heat exchanger process pipeline, a cleaning agent circulating system and a compressed air system;
the heat exchanger process pipeline comprises a first high-temperature medium pipeline (3a), a first high-temperature medium short pipe (2a), a first high-temperature medium interface section (1a), a second high-temperature medium interface section (1b), a second high-temperature medium short pipe (2b), a second high-temperature medium pipeline (3b), a first low-temperature medium pipeline (3c), a first low-temperature medium short pipe (2c), a first low-temperature medium interface section (1c), a second low-temperature medium interface section (1d), a second low-temperature medium short pipe (2d), a second low-temperature medium pipeline (3d) and a second low-temperature medium pipeline (3d), wherein the first high-temperature medium pipeline (3a), the first high-temperature medium short pipe (2a), the second high-temperature medium short pipe (1a), the first high-temperature medium interface section (1b), the second high-temperature medium pipeline (3c), the first low-temperature medium interface section (1c), the second low-temperature medium pipeline (2d), the second low-temperature medium pipeline (3d) and the second low-temperature medium pipeline (3c), A first high-temperature medium pressure sensor (8) arranged on a first high-temperature medium pressure guide pipe (7) communicated with the first high-temperature medium interface section (1a), a second high-temperature medium pressure sensor (12) arranged on a second high-temperature medium pressure guide pipe (14) communicated with the second high-temperature medium interface section (1b), a first low-temperature medium pressure sensor (17) arranged on a first low-temperature medium pressure guide pipe (16) communicated with the first low-temperature medium interface section (1c), a second low-temperature medium pressure sensor (11) arranged on a second low-temperature medium pressure pipe (9) communicated with the second low-temperature medium interface section (1d), a high-temperature medium side air pipeline (4) communicated with the first high-temperature medium interface section (1a), and a low-temperature medium side air pipeline (18) communicated with the first low-temperature medium interface section (1 c);
the cleaning agent circulating system comprises a cleaning agent storage tank (22), a first cleaning agent pipeline (26), a cleaning agent circulating pump (27) and a second cleaning agent pipeline (28) which are sequentially communicated, wherein the outlet of the second cleaning agent pipeline (28) is communicated with the joint of a first high-temperature medium interface section mating flange (37) or a first low-temperature medium interface section mating flange (46), the inlet of the cleaning agent blow-off pipeline (30) is communicated with the second cleaning agent pipeline (28), the outlet of the cleaning agent blow-off pipeline (30) is communicated with the inlet of a blow-off groove (34), the inlets of a third cleaning agent pipeline (40) and a fourth cleaning agent pipeline (42) are respectively communicated with the second cleaning agent pipeline (28), the outlets are respectively communicated with a fifth cleaning agent pipeline (39), the inlet of the fifth cleaning agent pipeline (39) is communicated with the joint of a second high-temperature medium interface section mating flange (44) or a second low-temperature medium interface section mating flange (47), the outlet of the fifth cleaning agent pipeline (39) is communicated with the inlet of the cleaning agent storage tank (22);
the compressed air system comprises an air compressor (48), a first air pipeline (49), an air storage tank (50), a second air pipeline (51), an air dryer (53), a third air pipeline (54), an air heater (55), a fourth air pipeline (56) and a compressed air hose (58) which are connected in sequence;
a first high-temperature medium root valve (6) is arranged on the first high-temperature medium pressure guide pipe (7), a second high-temperature medium root valve (13) is arranged on the second high-temperature medium pressure guide pipe (14), a first low-temperature medium root valve (15) is arranged on the first low-temperature medium pressure guide pipe (16), a second low-temperature medium root valve (10) is arranged on the second low-temperature medium pressure guide pipe (9), a high-temperature medium side air cutoff valve (5) is arranged on the high-temperature medium side air pipeline (4), and a low-temperature medium side air cutoff valve (19) is arranged on the low-temperature medium side air pipeline (18);
a storage tank blow-off valve (21) is arranged on the storage tank blow-off pipeline (20), a first cleaning agent cut-off valve (25) is arranged on the first cleaning agent pipeline (26), a second cleaning agent cut-off valve (29) and a third cleaning agent cut-off valve (36) are respectively arranged on the second cleaning agent pipeline (28) and positioned at two sides of the inlet of the third cleaning agent pipeline (40), a cleaning agent blow-off valve (31) is arranged on the cleaning agent blow-off pipeline (30), a blow-off tank blow-off valve (33) is arranged on the blow-off tank blow-off pipeline (32), a fourth cleaning agent cut-off valve (41) is arranged on the third cleaning agent pipeline (40), a fifth cleaning agent cut-off valve (43) is arranged on the fourth cleaning agent pipeline (42), a sixth cleaning agent cut-off valve (45) and a seventh cleaning agent cut-off valve (38) are respectively arranged on the fifth cleaning agent pipeline (39) and positioned on two sides of the outlet of the fourth cleaning agent pipeline (42).
2. The chemical cleaning system of the micro-channel heat exchanger as claimed in claim 1, wherein the first high temperature medium short pipe (2a), the second high temperature medium short pipe (2b), the first low temperature medium short pipe (2c) and the second low temperature medium short pipe (2d) are all flanged for easy disassembly.
3. The chemical cleaning system of the micro-channel heat exchanger as claimed in claim 1, wherein the cleaning agent storage tank (22) is provided with an inlet, an outlet, a drain outlet and a filter screen, wherein the inlet is open, the drain outlet is communicated with the storage tank drain pipeline (20), and the storage tank filter screen (23) is arranged along the cross section direction of the storage tank and separates the inlet from the outlet and the drain outlet; the cleaning agent circulating pump (27) is a corrosion-resistant liquid pump, and the cleaning agent circulating pump (27) is provided with a standby pump; the sewage draining groove (34) is provided with an inlet, a sewage draining outlet and a filter screen, wherein the inlet is open, the sewage draining outlet is communicated with a sewage draining pipeline (32) of the sewage draining groove, and the filter screen (35) of the sewage draining groove is arranged along the cross section direction of the sewage draining groove and separates the inlet from the sewage draining outlet.
4. The chemical cleaning system of the micro-channel heat exchanger as claimed in claim 1, wherein the cleaning agent storage tank (22) contains a cleaning agent (24), the cleaning agent (24) is composed of acid, corrosion inhibitor and water, different acid and corrosion inhibitor are adopted according to different dirt chemical compositions, deposition states and dirt amount in the micro-channel heat exchanger, the acid is one of hydrochloric acid, sulfuric acid, sulfamic acid, hydrofluoric acid, citric acid, nitric acid, ethylene diamine tetraacetic acid and nitrilotriacetic acid, and the corrosion inhibitor is one of higher pyridine base, Lan-826, nitroaniline, furfural, trithiocarbonate, alkyl benzyl pyridine chloride, Lan-5, quinoline, urotropine, ethyl quinoline iodide, diethyl thiourea and dibutyl.
5. The microchannel heat exchanger chemical cleaning system of claim 1, wherein the second air conduit (51) is provided with a filter (52) and the fourth air conduit (56) is provided with a main pipe air shut-off valve (57).
6. The method for cleaning a microchannel heat exchanger chemical cleaning system of any one of claims 1 to 5, comprising the steps of:
step 1: preparation work: dismantling a first high-temperature medium short pipe (2a), a second high-temperature medium short pipe (2b), a first low-temperature medium short pipe (2c) and a second low-temperature medium short pipe (2d), and installing a first high-temperature medium interface section mating flange (37), a second high-temperature medium interface section mating flange (44), a first low-temperature medium interface section mating flange (46) and a second low-temperature medium interface section mating flange (47);
step 2: hydraulic cleaning: the outlet of a second cleaning agent pipeline (28) is communicated with the joint of a first high-temperature medium interface section mating flange (37), the inlet of a fifth cleaning agent pipeline (39) is communicated with the joint of a second high-temperature medium interface section mating flange (44), the cleaning agent storage tank (22) is filled with clear water, a storage tank drain valve (21), a drain tank drain valve (33), a cleaning agent drain valve (31), a high-temperature medium side air block valve (5), a low-temperature medium side air block valve (19), a fourth cleaning agent block valve (41) and a fifth cleaning agent block valve (43) are closed, a first cleaning agent block valve (25), a second cleaning agent block valve (29), a third cleaning agent block valve (36), a sixth cleaning agent block valve (45) and a seventh cleaning agent block valve (38) are opened, a cleaning agent circulating pump (27) is started to establish water circulation, a leakage point of a system is checked and treated, and a hydraulic pressure test is completed, then, system equipment and pipelines are flushed by utilizing water circulation until no dirt is observed in water flow at an inlet of the cleaning agent storage tank (22);
and step 3: alkali washing: maintaining water circulation and slowly adding an alkali detergent into clear water in a detergent storage tank (22) until the alkali concentration is 0.5-1.5%, maintaining forward circulating alkali cleaning, namely, from the inlet of a high-temperature medium channel of the micro-channel heat exchanger to the outlet of the high-temperature medium channel until no dirt is observed in water flow at the inlet of the detergent storage tank (22), opening a fourth detergent cut-off valve (41) and a fifth detergent cut-off valve (43), closing a third detergent cut-off valve (36) and a sixth detergent cut-off valve (45), maintaining reverse circulating alkali cleaning, namely, stopping conveying the detergent (27) after no dirt is observed in water flow from the outlet of the high-temperature medium channel of the micro-channel heat exchanger to the inlet of the detergent storage tank (22), communicating the outlet of a compressed air hose (58) with the inlet of a high-temperature medium side air pipeline (4), opening the third detergent cut-off valve (36), A sixth cleaning agent block valve (45), a storage tank drain valve (21), a cleaning agent drain valve (31), a drain tank drain valve (33), a high-temperature medium side air block valve (5) and a main pipe air block valve (57), starting an air compressor (48), discharging the system alkaline cleaning waste liquid from a storage tank drain pipeline (20) and a drain tank drain pipeline (32) by using compressed air, stopping the air compressor (48), and introducing compressed air to drain cleaning waste water after the system is subjected to hydraulic cleaning according to the step 2;
and 4, step 4: acid washing: injecting clear water into the cleaning agent storage tank (22) and starting the cleaning agent circulating pump (27), establishing and maintaining system circulation, quantitatively adding the corrosion inhibitor into the cleaning agent storage tank (22), circulating for a period of time to enable the corrosion inhibitor to be dissolved uniformly and circulate uniformly, slowly adding acid into the cleaning agent storage tank (22) to a set concentration, opening a third cleaning agent cut-off valve (36) and a sixth cleaning agent cut-off valve (45), closing a fourth cleaning agent cut-off valve (41) and a fifth cleaning agent cut-off valve (43), keeping the forward circulation of the cleaning agent, observing the water quality change at an inlet of the cleaning agent storage tank (22), observing the pressure difference between a first high-temperature medium pressure sensor (8) and a second high-temperature medium pressure sensor (12), finishing the forward circulation when no dirt is added in the cleaning agent at the inlet of the cleaning agent storage tank (22) and the pressure difference between the first high-temperature medium pressure sensor (8) and the second high-temperature medium pressure sensor (12) is kept unchanged, opening a fourth cleaning agent stop valve (41) and a fifth cleaning agent stop valve (43), closing a third cleaning agent stop valve (36) and a sixth cleaning agent stop valve (45), and repeating the processes to complete reverse cycle acid cleaning;
and 5: and (3) post-treatment: the method comprises the following steps of (1) discharging acid pickling waste liquid in a system completely by adopting the method in the step (3), carrying out hydraulic cleaning on the system by adopting the method in the step (2), then quantitatively adding a passivating agent into a cleaning agent storage tank (22), keeping normal circulation for 4-60 hours, stopping a cleaning agent circulating pump (27), discharging passivation waste liquid in the system completely by adopting the method in the step (3), starting a compressed air system, introducing clean and dry hot air from an air pipeline (4) at the high-temperature medium side to sweep and remove residual moisture in the cleaning system, properly collecting solid impurities filtered on a storage tank filter screen (23) and a sewage discharge tank filter screen (35), and carrying out harmless treatment on the alkali pickling waste liquid, the acid pickling waste liquid and the passivation waste liquid according to the environmental protection requirement;
step 6: communicating an outlet of a second cleaning agent pipeline (28) with a joint of a first low-temperature medium interface section companion flange (46), communicating an inlet of a fifth cleaning agent pipeline (39) with a joint of a second low-temperature medium interface section companion flange (47), and repeating the steps 1-5 to complete chemical cleaning of a low-temperature medium side channel of the micro-channel heat exchanger;
and 7: and (3) dismantling the first high-temperature medium interface section mating flange (37), the second high-temperature medium interface section mating flange (44), the first low-temperature medium interface section mating flange (46) and the second low-temperature medium interface section mating flange (47), installing the first high-temperature medium short pipe (2a), the second high-temperature medium short pipe (2b), the first low-temperature medium short pipe (2c) and the second low-temperature medium short pipe (2d), and finishing the chemical cleaning work.
7. The cleaning method according to claim 6, wherein the alkaline detergent is a water-soluble solution of NaOHLiquid, Na2CO3Aqueous solution of (A) or (Na)3PO4An aqueous solution of (a).
8. The cleaning method according to claim 6, wherein the passivating agent is an aqueous solution of hydrazine, an aqueous solution of sodium nitrite, an aqueous solution of triethanolamine, or an aqueous solution of sodium phosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110638937.1A CN113251852A (en) | 2021-06-08 | 2021-06-08 | Chemical cleaning system and method for micro-channel heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110638937.1A CN113251852A (en) | 2021-06-08 | 2021-06-08 | Chemical cleaning system and method for micro-channel heat exchanger |
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