CN108645275B - Low-temperature multi-effect seawater desalination cleaning and descaling system and cleaning and descaling method - Google Patents
Low-temperature multi-effect seawater desalination cleaning and descaling system and cleaning and descaling method Download PDFInfo
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- CN108645275B CN108645275B CN201810385542.3A CN201810385542A CN108645275B CN 108645275 B CN108645275 B CN 108645275B CN 201810385542 A CN201810385542 A CN 201810385542A CN 108645275 B CN108645275 B CN 108645275B
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a low-temperature multi-effect seawater desalination cleaning descaling system and a cleaning descaling method, wherein the cleaning descaling system comprises: the cleaning device comprises a cleaning medicine box, a cleaning circulating pump, a water inlet pipeline and a water return pipeline, wherein the output end of the cleaning medicine box is connected with the input end of the cleaning circulating pump, and a cleaning medium is stored in the cleaning medicine box; the output end of the cleaning circulating pump is connected with one end of the water inlet pipeline; the other end of the water inlet pipeline is connected with a spraying component at the top of one effect group of the evaporator; one end of the water return pipeline is communicated with the bottom of the effect group, and the other end of the water return pipeline is connected with the recovery end of the cleaning medicine box. The cleaning descaling system and the cleaning descaling method can improve the cleaning effect and improve the water production performance of the cleaned equipment.
Description
Technical Field
The invention relates to the technical field of seawater desalination, in particular to a low-temperature multi-effect seawater desalination cleaning and descaling system and a cleaning and descaling method.
Background
Water resources in the nature are limited, along with the development of agriculture and industrial production, along with the population expansion of developing countries and the continuous progress of living standard of people, the global water consumption is increased sharply, China belongs to water-deficient countries, and particularly coastal cities are more serious in water shortage. In order to save fresh water resources, the development of seawater resources has become a necessary trend, and the seawater desalination technology is more and more emphasized. The low-temperature multi-effect seawater desalination technology is widely adopted due to the advantages of low energy consumption, simple pretreatment process and the like, but because the heat exchange tube bundle directly exchanges heat with seawater, mineral substances and salt generated when the temperature of the seawater rises are deposited to cause scaling of the heat exchange tube, the scaling can greatly reduce the heat conduction coefficient, and the problem is always an unavoidable problem of the thermal seawater desalination equipment.
The chemical cleaning quality acceptance specification of industrial equipment only has 85 percent of descaling rate for sulfate and 95 percent of descaling rate for carbonate. The possible main scaling components of the heat exchange surface of the seawater desalination distillation equipment are calcium carbonate, magnesium hydroxide and calcium sulfate. The scale formed by calcium carbonate and magnesium hydroxide is easily removed by acid washing, while CaSO4Difficult to be removed by acid cleaning and can only be thoroughly solved by replacing the heat exchange tube.
The cleaning and descaling technology in the prior art has poor descaling effect on heat exchange parts of distillation equipment.
Disclosure of Invention
The application provides a low-temperature multi-effect seawater desalination cleaning descaling system and a cleaning descaling method, which solve or partially solve the technical problem that the cleaning descaling technology in the prior art has poor descaling effect on heat exchange parts of distillation equipment.
The application provides a low-temperature multi-effect seawater desalination cleaning descaling system, which is used for removing scale bodies attached to heat exchange tubes of an evaporator in a seawater desalination system, wherein the evaporator comprises a plurality of effect groups, and each effect group is provided with the heat exchange tube; the low-temperature multi-effect seawater desalination, cleaning and descaling system comprises: wash the medical kit, wash circulating pump, inlet channel and return water pipeline, wherein:
the output end of the cleaning medicine box is connected with the input end of the cleaning circulating pump, and a cleaning medium is stored in the cleaning medicine box;
the output end of the cleaning circulating pump is connected with one end of the water inlet pipeline;
the other end of the water inlet pipeline is connected with a spraying component at the top of one of the effect groups to be cleaned of the evaporator;
one end of the water return pipeline is communicated with the bottom of the effect group to be cleaned, and the other end of the water return pipeline is connected with the recovery end of the cleaning medicine box.
Preferably, the spraying component is connected with the seawater inlet pipe through a seawater branch pipe, and the seawater branch pipe is provided with a plugging blind plate.
Preferably, the bottom of the effect group is connected with a strong brine pipeline through a strong brine branch pipe, and the strong brine branch pipe is provided with a plugging partition plate.
Preferably, the water return pipe is provided with a return flow control valve.
Preferably, the bottom of the effect group is provided with a reflux hole of 200 mm;
the water return pipeline is connected with the backflow hole.
Preferably, the output end of the cleaning medicine box is connected with a plurality of cleaning circulating pumps;
the water inlet pipeline is provided with a pressure gauge.
Preferably, a filtering member is provided in the cleaning agent tank, and the filtering member filters the cleaning medium returned by the return pipe.
Preferably, the scaling body of the heat exchange tube of the effect group is provided with a groove.
Based on the same inventive concept, the application also provides a cleaning and descaling method which is realized by the low-temperature multi-effect seawater desalination cleaning and descaling system and comprises the following steps:
disconnecting the bottom of the effect group to be cleaned of the evaporator from a strong brine pipeline through a plugging partition plate;
the spray components in the effect groups are disconnected from the seawater branch pipes through plugging blind plates;
communicating the water inlet pipeline with the spray component;
a plurality of grooves are formed on the scaling body of the heat exchange tube of the effect group;
and starting the cleaning circulating pump, and cleaning and descaling the heat exchange tubes of the effect group by the cleaning medium of the cleaning medicine box.
Preferably, the cleaning medium comprises: acidic agents and neutral agents;
firstly, carrying out first cleaning and descaling on the heat exchange tube by the acid medicament;
then the heat exchange tube is cleaned and descaled for the second time through the neutral medicament;
and finally, carrying out third cleaning and descaling on the heat exchange tube through the acidic reagent.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
the cleaning and descaling system is composed of a cleaning medicine box, a cleaning circulating pump, a water inlet pipeline and a water return pipeline, the output end of the cleaning medicine box is connected with the input end of the cleaning circulating pump, and a cleaning medium is stored in the cleaning medicine box; the output end of the cleaning circulating pump is connected with one end of the water inlet pipeline; the other end of the water inlet pipeline is connected with a spraying component at the top of one effect group of the evaporator; the bottom of organizing is imitated in the one end intercommunication of return water pipeline, and the recovery end of wasing the medical kit is connected to the other end, and cleaning medium sends into spray component through wasing the circulating pump, sprays then on the scaling body of the heat exchange tube of imitating the internal, carries out chemical cleaning to the scaling body, and cleaning medium after the washing flows down this bottom of imitating the group and flows back to wasing the medical kit through return water pipeline, forms the circulation of wasing the medium. The design structure of the existing low-temperature multi-effect evaporator is utilized, the cleaning mode of independent extracorporeal circulation of each effect group is adopted, each effect group is independently and efficiently cleaned, the cleaning time of each effect group is prolonged, the adjustment of cleaning agents is more flexible, equipment conditions are created for the pickling-neutral cleaning-pickling combined type cleaning mode, and carbonate-sulfate compound type scales can be effectively removed. Like this, effectively solved the relatively poor technical problem of scale removal effect of prior art's washing scale removal technique to distillation plant heat transfer part, realized improving the cleaning performance, promoted the technical effect of the equipment water production performance after wasing.
Drawings
FIG. 1 is a schematic structural diagram of a low-temperature multi-effect seawater desalination, cleaning and descaling system provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of a cleaning and descaling method according to an embodiment of the present application.
(in the figure, the parts represented by the reference numerals are a water return pipeline 1, a cleaning medicine box 2, a cleaning circulating pump 3, a water inlet pipeline 4, a pressure gauge 5, a spraying part 6, a heat exchange pipe 7, an effect group 8, a blocking blind plate 9, a seawater branch pipe 10 and a filtering part 11 in sequence)
Detailed Description
The embodiment of the application provides a low temperature multiple-effect seawater desalination cleaning descaling system and cleaning descaling method, the technical problem that the descaling effect of the cleaning descaling technology of the prior art to distillation equipment heat exchange component is poor is solved or partially solved, through setting up by rinsing the medical kit, rinse the circulating pump, the cleaning descaling system that inlet channel and return water pipeline are constituteed, cleaning medium sends into spray assembly through rinsing the circulating pump, then spray to on the scaling body of the heat exchange tube in the effect group, carry out chemical cleaning to the scaling body, cleaning medium after the washing flows down the bottom of this effect group and flows back to the cleaning medical kit through the return water pipeline, form the circulation of cleaning medium, the improvement cleaning performance has been realized, promote the technological effect of equipment water production performance after the washing.
Example one
Referring to the attached drawing 1, the application provides a low-temperature multi-effect seawater desalination cleaning descaling system, which is used for removing a scaling body attached to a heat exchange tube 7 of an evaporator in a seawater desalination system, wherein the evaporator comprises a plurality of effect groups 8, and each effect group 8 is provided with the heat exchange tube 7; the low-temperature multi-effect seawater desalination, cleaning and descaling system comprises: wash medical kit 2, wash circulating pump 3, inlet channel 4 and return water pipeline 1, wherein:
the output end of the cleaning medicine box 2 is connected with the input end of the cleaning circulating pump 3, and the cleaning medicine box 2 stores cleaning media; the output end of the cleaning circulating pump 3 is connected with one end of the water inlet pipeline 4; the other end of the water inlet pipeline 4 is connected with a spraying part 6 at the top of one effect group 8 of the evaporator; one end of the water return pipeline 1 is communicated with the bottom of the effect group 8, and the other end of the water return pipeline is connected with the recovery end of the cleaning medicine box 2.
Cleaning medium is sent into spray component 6 through cleaning circulating pump 3, sprays on the scaling body of the heat exchange tube 7 in effect group 8 then, carries out chemical cleaning to the scaling body, and cleaning medium after the washing flows down this bottom of effect group 8 and flows back to washing medical kit 2 through return water pipeline 1, forms cleaning medium's circulation.
The cleaning descaling system adopts the design structure of the existing low-temperature multi-effect evaporator and the cleaning mode of independent extracorporeal circulation of each effect group 8 to efficiently clean each effect group 8 independently, so that the cleaning time of each effect group 8 is prolonged, the adjustment of cleaning agents is more flexible, equipment conditions are created for the acid cleaning-neutral cleaning-acid cleaning combined type cleaning mode, and carbonate-sulfate compound scale can be effectively removed.
Further, the spraying component 6 is connected with a seawater inlet pipe through a seawater branch pipe 10, and the seawater branch pipe 10 is provided with a plugging blind plate 9. The bottom of the effect group 8 is connected with a strong brine pipeline through a strong brine branch pipe, and the strong brine branch pipe is provided with a plugging partition plate. The effect group 8 of the evaporator forms a closed space by the blind sealing plate 9 and the partition plate, so that the circulation of the cleaning medium inside the effect group 8 is performed.
Furthermore, the water return pipeline 1 is provided with a return control valve, and the bottom of the effect group 8 is provided with a return hole of 200 mm; the water return pipeline 1 is connected with a return hole, and the flow of the cleaning medium returning to the cleaning medicine box 2 is controlled by a return control valve.
Further, the output end of the cleaning medicine chest 2 is connected with a plurality of cleaning circulating pumps 3; the water inlet pipe 4 is provided with a pressure gauge 5, and the number of the cleaning circulating pumps 3 is adjusted to be opened by observing the pressure of the pressure gauge 5, so that the requirement of the cleaning water quantity is met.
Further, a filtering member 11 is provided in the cleaning medicine tank 2, and the filtering member 11 filters the cleaning medium returned from the return pipe 1. The scaling body of the heat exchange tube 7 of the effect group 8 is provided with a groove, and a cross-shaped or # -shaped groove channel can be formed on the scaling body, so that the cleaning medium is fully contacted with the scaling body.
Example two
Referring to the attached fig. 2, the application also provides a cleaning and descaling method, which is realized by the low-temperature multi-effect seawater desalination cleaning and descaling system of the first embodiment, and comprises the following steps:
s1: the strong brine channel at the bottom of the first effect of the evaporator is disconnected with the strong brine pipeline through the plugging partition plate;
s2: the spray component 6 in the first effect is disconnected from the seawater branch pipe 10 through the plugging blind plate 9;
s3: one end of a water inlet pipeline 4 is communicated with a spraying part 6, the other end of the water inlet pipeline is communicated with a cleaning circulating pump set, a pressure gauge 5 is arranged on the water inlet pipeline 4, the input end of the cleaning circulating pump set is communicated with a cleaning medicine box 2, a backflow hole of 200mm is formed in the bottom of a first effect, the backflow hole and the cleaning medicine box 2 are connected through a water return pipeline 1, and a backflow control valve is arranged on the water return pipeline 1;
s4: a plurality of cross-shaped grooves are formed on the scaling body of the first-effect heat exchange tube 7;
s5: and (3) starting a cleaning circulating pump 3, and cleaning and descaling the heat exchange tube 7 of the first effect by cleaning media of the cleaning medicine box 2.
Further, the cleaning medium includes: acidic agents and neutral agents; step S5 includes:
s501: firstly, cleaning and descaling the heat exchange tube 7 for the first time by using an acid medicament;
s502: then the heat exchange tube 7 is cleaned and descaled for the second time by a neutral medicament;
s503: and finally, carrying out third cleaning and descaling on the heat exchange tube 7 by using an acid medicament.
The cleaning descaling method breaks through the original traditional cleaning process flow, utilizes the design structure of the original low-temperature multi-effect evaporator, adopts the cleaning mode of independent extracorporeal circulation of each effect, and compared with the traditional cleaning mode, realizes independent high-efficiency cleaning of each effect, prolongs the cleaning time of each effect, has more flexible adjustment of cleaning agents, and solves the cleaning problem of carbonate-sulfate compound scale through the combined cleaning mode of pickling-neutral cleaning-pickling. The independent descaling and cleaning technology not only improves the descaling rate of calcium sulfate salt, but also saves the equipment maintenance time, simultaneously saves the manpower and material resources required by replacing the heat exchange tube, and greatly improves the maintenance efficiency.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The low-temperature multi-effect seawater desalination cleaning descaling system is characterized by being used for removing scale bodies attached to heat exchange tubes of an evaporator in the seawater desalination system, wherein the evaporator comprises a plurality of effect groups, and each effect group is provided with the heat exchange tube; the low-temperature multi-effect seawater desalination, cleaning and descaling system comprises: wash the medical kit, wash circulating pump, inlet channel and return water pipeline, wherein:
the output end of the cleaning medicine box is connected with the input end of the cleaning circulating pump, and a cleaning medium is stored in the cleaning medicine box;
the output end of the cleaning circulating pump is connected with one end of the water inlet pipeline;
the other end of the water inlet pipeline is connected with a spraying component at the top of one of the effect groups to be cleaned of the evaporator;
one end of the water return pipeline is communicated with the bottom of the effect group to be cleaned, and the other end of the water return pipeline is connected with the recovery end of the cleaning medicine box;
the spraying component is connected with a seawater inlet pipe through a seawater branch pipe, and the seawater branch pipe is provided with a plugging blind plate;
the bottom of the effect group is connected with a strong brine pipeline through a strong brine branch pipe, and the strong brine branch pipe is provided with a plugging partition plate;
a filtering part is arranged in the cleaning medicine box and is used for filtering the cleaning medium returned by the water return pipeline; the filtering parts are arranged on the top wall and the bottom wall of the cleaning medicine box in a staggered mode, so that the cleaning medium forms an S-shaped flow path in the cleaning medicine box;
a plurality of cross-shaped or groined-shaped grooves are formed in the scaling body of the heat exchange tube of the effect group;
the water return pipeline is provided with a return flow control valve;
the bottom of the effect group is provided with a reflux hole of 200 mm;
the water return pipeline is connected with the backflow hole;
the output end of the cleaning medicine box is connected with a plurality of cleaning circulating pumps;
the water inlet pipeline is provided with a pressure gauge.
2. The cleaning and descaling method is realized by the low-temperature multi-effect seawater desalination cleaning and descaling system of claim 1, and comprises the following steps of:
disconnecting the bottom of the effect group to be cleaned of the evaporator from a strong brine pipeline through a plugging partition plate;
the spray components in the effect groups are disconnected from the seawater branch pipes through plugging blind plates;
communicating the water inlet pipeline with the spray component;
a plurality of cross-shaped or groined-shaped grooves are formed in the scaling bodies of the heat exchange tubes of the effect group;
starting the cleaning circulating pump, and cleaning and descaling the heat exchange tubes of the effect groups through the cleaning media of the cleaning medicine box;
the cleaning medium includes: acidic agents and neutral agents;
firstly, carrying out first cleaning and descaling on the heat exchange tube by the acid medicament;
then the heat exchange tube is cleaned and descaled for the second time through the neutral medicament;
and finally, carrying out third cleaning and descaling on the heat exchange tube through the acidic reagent.
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| CN109250846B (en) * | 2018-10-18 | 2021-08-24 | 倍杰特集团股份有限公司 | Salt-containing wastewater treatment system for inhibiting scaling |
| CN112815767B (en) * | 2021-01-15 | 2022-11-11 | 中国神华能源股份有限公司国华电力分公司 | Cleaning method of seawater desalination device |
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