CN113461204A - Heat supply network supplementing water treatment device and method - Google Patents
Heat supply network supplementing water treatment device and method Download PDFInfo
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- CN113461204A CN113461204A CN202110740668.XA CN202110740668A CN113461204A CN 113461204 A CN113461204 A CN 113461204A CN 202110740668 A CN202110740668 A CN 202110740668A CN 113461204 A CN113461204 A CN 113461204A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 273
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 16
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 118
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 108
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 108
- 239000011734 sodium Substances 0.000 claims abstract description 108
- 239000013505 freshwater Substances 0.000 claims abstract description 84
- 239000008234 soft water Substances 0.000 claims description 56
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000002351 wastewater Substances 0.000 claims description 15
- 239000013589 supplement Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract 1
- 208000028659 discharge Diseases 0.000 description 16
- 239000012141 concentrate Substances 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 108010001267 Protein Subunits Proteins 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- 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
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
Abstract
The invention relates to a heat supply network supplementing water treatment device, which comprises a reverse osmosis device, a softening device, a storage device, a fresh water bypass, a PH adjusting device, a heat supply network circulating unit and a program control device, wherein the reverse osmosis device is connected with the softening device through a pipeline; wherein: the softening device comprises a sodium bed, the sodium bed is communicated with the water outlet end of the reverse osmosis device through a sodium bed water inlet pipeline, the sodium bed is communicated with the storage device through a sodium bed water outlet pipeline, and two ends of the fresh water bypass are respectively communicated with the water outlet end of the reverse osmosis device and the sodium bed water outlet pipeline; the storage device is communicated with the heat supply network circulating unit through a water supplementing pipeline, and the PH adjusting device is communicated with the water supplementing pipeline; and a heat supply network circulating pipeline is arranged in the heat supply network circulating unit. The invention has the effects of reducing the cost and improving the recovery efficiency during water treatment.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a heat supply network supplementing water treatment device and method.
Background
The reverse osmosis device is widely applied to the field of water treatment, the product fresh water of the reverse osmosis device is used for water inlet of a demineralized water treatment system, the investment and the operating cost of the demineralized water treatment can be greatly reduced, and meanwhile, the product fresh water of the reverse osmosis device is used for supplementing water to a heat supply network and is used as a heat transfer medium of the heat supply network system, so that the scaling tendency of the heat supply network system is reduced, and the whole network heat supply is realized.
Because the recovery rate of the reverse osmosis device is about 70-80% generally, 20-30% of wastewater is generated, the salt content of the wastewater is about 3-5 times of that of inlet water of the reverse osmosis device, the water quality of the part of wastewater is poor, the water quantity is large, zero discharge treatment of the wastewater is generally needed when the discharge is increasingly strict, particularly in a power plant, the investment is millions of yuan per ton of water or even higher, and the total investment is thousands of millions of yuan. Therefore, the recycling of reverse osmosis concentrated water is very important.
The requirement on water quality is low for the heat supply network replenishing water, only the hardness and suspended matters are required to be controlled, reverse osmosis produced fresh water is generally adopted as the heat supply network replenishing water, the reverse osmosis water yield is increased, the discharge of reverse osmosis concentrated water is also increased, and further the capacity of wastewater zero-discharge treatment equipment is adversely affected.
The applicant believes that the related art has the following technical problems that the treatment efficiency is low and the cost is high when the wastewater treatment is carried out, and a wastewater treatment mode which reduces the cost and improves the recovery efficiency is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention provides a heat supply network supplementing water treatment device and a method.
In a first aspect, the invention provides a heat supply network supplementing water treatment device, which comprises the following technical scheme,
a heat supply network supplementing water treatment device comprises a reverse osmosis device, a softening device, a storage device, a fresh water bypass, a pH adjusting device, a heat supply network circulating unit and a program control device; wherein:
the softening device comprises a sodium bed, the sodium bed is communicated with the water outlet end of the reverse osmosis device through a sodium bed water inlet pipeline, the sodium bed is communicated with the storage device through a sodium bed water outlet pipeline, and two ends of the fresh water bypass are respectively communicated with the water outlet end of the reverse osmosis device and the sodium bed water outlet pipeline; the storage device is communicated with the heat supply network circulating unit through a water supplementing pipeline, and the PH adjusting device is communicated with the water supplementing pipeline; and a heat supply network circulating pipeline is arranged in the heat supply network circulating unit.
Furthermore, the bed water outlet pipeline is connected with a softened water hardness meter C1, the softened water hardness meter C1 is used for detecting softened water in the sodium bed water outlet pipeline, and the early warning value of the softened water hardness meter C1 is 0.5 mmol/L.
Furthermore, the reverse osmosis device is connected with a reverse osmosis concentrated water pipeline, the reverse osmosis concentrated water pipeline is communicated with the sodium bed through a sodium bed water inlet pipeline, a sodium bed water inlet valve V1 is arranged on the sodium bed water inlet pipeline, and a reverse osmosis concentrated water discharge valve V4 is arranged on the reverse osmosis concentrated water pipeline.
Furthermore, the reverse osmosis device is connected with a reverse osmosis fresh water pipeline, two ends of the fresh water bypass are respectively connected with the reverse osmosis fresh water pipeline and a sodium bed water outlet pipeline, and a sodium bed drain valve V2 is arranged on the sodium bed water outlet pipeline.
Furthermore, a fresh water bypass valve V3 is arranged on the fresh water bypass.
Furthermore, the storage device comprises a soft water tank, and a make-up water pipeline is connected with a make-up water pump; the PH adjusting device is a sodium hydroxide adding device and adjusts the PH value in the heat supply network circulating pipeline to 8-9.
Furthermore, the heat supply network circulating pipeline is connected with a circulating water hardness meter C2, the heat supply network circulating pipeline is connected with a discharge pipeline, and the discharge pipeline is connected with a heat supply network discharge valve V5.
On the other hand, the invention also provides a method for treating the supplementary water of the heat supply network, which comprises the following technical scheme,
a method for processing supplementary water of a heat supply network comprises the following steps,
the wastewater enters a reverse osmosis device for reverse osmosis to obtain reverse osmosis concentrated water and reverse osmosis fresh water, the reverse osmosis fresh water flows into a reverse osmosis fresh water pipeline to be used as boiler water or make-up water of a fresh water bypass, and the reverse osmosis concentrated water flows into a reverse osmosis concentrated water pipeline to be used as sodium bed water or to be discharged;
softening the reverse osmosis concentrated water by the sodium bed to obtain soft water, and sending the soft water into a soft water tank through a sodium bed water outlet pipeline for storage;
the soft water in the soft water tank is sent to the heat supply network circulation unit through a water replenishing pipeline to be used as replenishing water.
Furthermore, when the softened water hardness meter C1 detects that the softened soft water hardness value of the sodium bed is too high, the sodium bed stops water feeding, and a reverse osmosis concentrated water discharge valve V4 on a reverse osmosis concentrated water pipeline is opened for discharging reverse osmosis concentrated water; and a fresh water bypass valve V3 on the fresh water bypass is opened to replenish fresh water for the sodium bed water outlet pipeline and the soft water tank.
Furthermore, when the softened water hardness meter C1 detects that the softened soft water hardness value of the sodium bed is too high, the fresh water bypass valve V3 on the fresh water bypass is opened, and the reverse osmosis soft water is used for supplementing the soft water of the supplementing water.
Furthermore, when the circulating water hardness meter C2 detects that the circulating water hardness in the circulating pipeline of the heat supply network is too high, a heat supply network discharge valve V5 on the circulating water discharge pipeline is opened and water is discharged.
The invention has at least the following advantages:
1. according to the technical scheme, the reverse osmosis concentrated water originally discharged as the wastewater is treated and then used as the supplementary water of the heat supply network, so that the comprehensive utilization of the wastewater is realized.
2. Through the structure of sclerometer C1 and C2, detect the quality of water in the pipeline, can come to the sodium bed through the valve and intake when the sodium bed goes out water unusual and control, the fresh water that reverse osmosis unit produced can carry out the fresh water replenishment to the make-up water through the fresh water bypass, promotes the quality of water of make-up water.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of a main body of a processing apparatus in an embodiment of the present application;
FIG. 2 is a schematic view of a pH adjusting device in the example of the present application.
Reference numerals: 1. a reverse osmosis unit; 11. a reverse osmosis concentrated water pipeline; 12. a reverse osmosis fresh water pipeline; 21. a sodium bed water inlet pipeline; 22. a sodium bed water outlet pipeline; 3. a soft water tank; 31. a water replenishing pipeline; 4. a heat supply network circulation unit; 41. a heat supply network circulation line; 5. a pH adjusting device; 51. a batch tank; 52. a metering pump; 6. a fresh water bypass; v1, sodium bed inlet valve; v2, sodium bed outlet valve; v3, fresh water bypass valve; v4, reverse osmosis concentrated water discharge valve; v5, heat net drain valve; c1, soft water hardness table; c2, circulating water hardness table.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Referring to fig. 1 and 2, the embodiment discloses a heat supply network make-up water treatment device, which comprises a reverse osmosis device 1, a softening device, a storage device, a fresh water bypass 6, a PH adjusting device 5, a heat supply network circulation unit 4 and a program control device. The reverse osmosis device 1 is used for feeding water to be treated, the water to be treated enters the reverse osmosis device 1 and then is treated by the reverse osmosis device 1 to obtain reverse osmosis fresh water and reverse osmosis concentrated water, the reverse osmosis device 1 is connected with a reverse osmosis concentrated water pipeline 11 and a reverse osmosis fresh water pipeline 12, the reverse osmosis fresh water flows into the reverse osmosis fresh water pipeline 12, and the reverse osmosis fresh water pipeline 12 is communicated with a boiler system and used for supplying boiler water. The concentrated water of the reverse osmosis device 1 is discharged through a reverse osmosis concentrated water pipeline 11.
Referring to fig. 1, a reverse osmosis concentrate discharge valve V4 is installed on the reverse osmosis concentrate line 11 to control discharge of reverse osmosis concentrate. The softening device comprises a sodium bed 2, a sodium bed water inlet pipeline 21 is connected between reverse osmosis concentrated water pipelines 11, and reverse osmosis concentrated water enters the sodium bed 2 through the sodium bed water inlet pipeline 21 to be softened, so that the hardness of the reverse osmosis concentrated water is reduced, and the water quality requirement of make-up water is met better. A sodium bed water inlet valve V1 is arranged on the sodium bed water inlet pipeline 21 and is used for controlling the water inlet of the sodium bed 2. The sodium bed 2 is connected with a sodium bed water outlet pipeline 22, and softened water is discharged through the sodium bed water outlet pipeline 22. The storage device comprises a soft water tank 3, and a sodium bed water outlet pipeline 22 is communicated with the soft water tank 3 and used for delivering the soft water treated by the sodium bed 2 into the soft water tank 3 for storage. The reverse osmosis concentrate discharge valve V4 is in a parallel relationship with the sodium bed inlet line 21. Normally, either one of the reverse osmosis concentrate discharge valve V4 and the sodium bed feed valve V1 is selected to be opened, the reverse osmosis concentrate discharge valve V4 is closed, and concentrate flows into the sodium bed feed line 21 when the sodium bed feed valve V1 is opened, otherwise no water flows in the sodium bed feed line 21 and is discharged through the reverse osmosis concentrate discharge valve V4.
Referring to fig. 1, the heat supply network circulation unit 4 includes a heat supply network circulation pipeline 41, a heating sub-unit and a heat exchange sub-unit, and each sub-unit of the heat supply network circulation unit 4 is communicated with the heat supply network circulation pipeline 41. The water outlet end of the soft water tank 3 is connected with a make-up water pipeline 31, and the make-up water pipeline 31 is communicated with a heat supply network circulating pipeline 41 and used for supplementing water for the heat supply network circulating unit 4. And a heat supply network discharge valve V5 is installed on the heat supply network circulating pipeline 41 and used for realizing sewage discharge.
Referring to fig. 1, the reverse osmosis fresh water pipeline 12 is communicated with the sodium bed outlet pipeline 22 through a fresh water bypass 6, the fresh water bypass 6 realizes the communication between the reverse osmosis fresh water pipeline 12 and the sodium bed outlet pipeline 22, and a fresh water bypass valve V3 is further installed on the fresh water bypass 6 and is used for controlling the communication of water flow in the fresh water bypass 6. When the water outlet of the sodium bed 2 is abnormal, the fresh water can be sent into the water outlet pipeline 22 of the sodium bed through the fresh water bypass 6, and the water quality of the inlet water of the soft water tank 3 is improved. Meanwhile, a sodium bed water outlet valve V2 is arranged on the sodium bed water outlet pipeline 22 and is used for controlling the outlet of the soft water of the sodium bed 2.
Referring to fig. 1, the make-up water pipeline 31 that the soft water tank 3 is connected communicates with the heat supply network circulation pipeline 41, before moisturizing, need carry out the pH valve to the quality of water in the pipeline and adjust, make-up water pipeline 31 is connected with pH adjusting device 5, pH adjusting device 5 passes through the pipeline and communicates with make-up water pipeline 31, realize the pH valve through adding sodium hydroxide in to make-up water pipeline 31 and adjust, the soft water pH value before will entering into heat supply network circulation pipeline 41 is adjusted to 8-9, make its pH valve accord with the pH valve requirement of heat supply network make-up water.
Referring to fig. 2, the PH adjusting device 5 includes a metering tank 51, a metering pump 52, and a connecting pipe, the metering pump 52 and the metering tank 51 are connected by the connecting pipe, and the metering pump 52 is communicated with the makeup water line 31 by the connecting pipe. The metering tank 51 is used for storing a sodium hydroxide solvent, when the pH value in a water supplementing pipeline needs to be adjusted, the sodium hydroxide solvent in the metering tank 51 enters the metering pump 52 and enters the water supplementing pipeline through a pipeline, so that the pH value of soft water is adjusted, the soft water is weakly alkaline, and the water quality requirement of a heat supply network unit is met.
The program control device is connected with the softened water hardness meter C1 and the circulating water hardness meter C2, and when the hardness of the softened water hardness meter C1 or the circulating water hardness meter C2 exceeds a set value, the program control device gives an alarm to remind that the hardness of water flow in a pipeline exceeds a standard. After the softened water hardness meter C1 gives an alarm, the water outlet of the sodium bed 2 is abnormal, the softened water does not meet the water quality requirement of the heat supply network make-up water, the sodium bed 2 needs to be stopped to continue to discharge water, and the make-up water needs to be supplemented with fresh water. When the alarm of C2 indicates that the water flow in the heat supply network circulation pipeline 41 has more accumulated impurities, the hardness of the water flow does not meet the water quality requirement of the circulating water, and the circulating water in the heat supply network circulation pipeline 41 needs to be discharged.
The embodiment of the application also discloses a method for treating the supplementary water of the heat supply network, which comprises the following steps,
step one, the wastewater to be treated enters a reverse osmosis device 1 for reverse osmosis to obtain reverse osmosis concentrated water and reverse osmosis fresh water.
Because the reverse osmosis device 1 is provided with two water outlet pipelines, namely a reverse osmosis concentrated water pipeline 11 and a reverse osmosis fresh water pipeline 12, reverse osmosis concentrated water with higher concentration enters the reverse osmosis concentrated water pipeline 11 for flowing into the sodium bed 2 or directly discharging. The reverse osmosis fresh water with lower concentration enters a reverse osmosis fresh water pipeline 12, the reverse osmosis fresh water pipeline 12 is connected with a boiler, and therefore the reverse osmosis fresh water can flow into the boiler to be used as boiler make-up water. Meanwhile, since the fresh water bypass 6 is also communicated with the reverse osmosis fresh water pipeline 12, the reverse osmosis fresh water can also flow into the fresh water bypass 6, and the fresh water bypass valve V3 on the fresh water bypass 6 in a normal state is closed, so that the fresh water cannot pass through, and the fresh water mainly flows into the boiler to be used as the make-up water for the boiler water.
And step two, the sodium bed 2 softens the reverse osmosis concentrated water flowing into the sodium bed to obtain soft water, and the soft water flows into the soft water tank 3 through the sodium bed water outlet pipeline 22 to be stored.
By utilizing the high-pressure characteristic of the reverse osmosis concentrated water, the reverse osmosis concentrated water can enter the sodium bed 2 for softening, and then enters the soft water tank 3 for storage through a water outlet pipeline of the sodium bed 2 connected with the water outlet end of the sodium bed 2.
The effective volume of the soft water tank 3 should be the water production of the sodium bed 2 for two to three hours, taking into account the stability of the water supply system. Two ends of the fresh water bypass 6 are respectively communicated with the reverse osmosis fresh water pipeline and the sodium bed 2 water outlet pipeline, and the fresh water in the fresh water bypass 6 can be sent into the sodium bed 2 water outlet pipeline for fresh water supplement. When the hardness meter of softened water detects that the hardness value of the effluent of the sodium bed 2 is too high, fresh water can be added through the fresh water bypass 6, so that the quality of the make-up water reaches the standard.
And step three, soft water in the soft water tank 3 enters the heat supply network circulating unit 4 through the make-up water pipeline 31 and is used for normal water make-up of the heat supply network system.
The soft water in the make-up water line 31 is introduced into the heat supply network circulation line 41 of the heat circulation unit, and as make-up water, the heat supply network circulation pump to which the heat supply network circulation line 41 is connected circulates the water flow. And a discharge pipeline connected to the heat supply network circulation pipeline 41 can discharge sewage in the heat supply network system.
In the normal use process, the water inlet valve V1 of the sodium bed is opened, reverse osmosis concentrated water enters the sodium bed 2 for softening, the water outlet valve V2 of the sodium bed is also opened, and the soft water enters the soft water tank 3 for storage. The heat network discharge valve V5 is closed so that the water flow in the heat network circulation line 41 is normally circulated. The reverse osmosis concentrate drain valve V4, the fresh water bypass valve V3, and the heat net drain valve V5 are all closed.
The heat supply network supplementing water treatment method also comprises the following aspects,
1. a treatment mode when the softened water of the sodium bed 2 is abnormal;
in the using process, the softened water hardness meter C1 can monitor the hardness of the outlet water of the sodium bed 2 in the sodium bed outlet pipe 22, when the softened water hardness meter C1 monitors that the hardness value of the softened water exceeds 0.5mmol/L, an alarm can be given, and the outlet water of the sodium bed 2 is abnormal. The sodium bed feed valve V1 needs to be closed and the concentrated water produced by the reverse osmosis unit 1 cannot enter the sodium bed 2. The abnormal softening of the soft water of the sodium bed 2 is mostly caused by a failure of the sodium bed 2 or by a failure of the exchange resin. When the sodium bed 2 cannot normally produce qualified soft water, the sodium bed water inlet valve V1, the sodium bed water outlet valve V2 and the heat supply network discharge valve V5 are all closed, the fresh water bypass valve V3 is opened, fresh water in the fresh water bypass V3 enters the sodium bed water outlet pipeline 22 and flows into the soft water tank 3 to supplement the soft water, and the soft water is used as supplement water of the heat supply network unit, so that the utilization rate of water resources is improved.
2. A treatment mode when the heat supply network pollution discharge is required;
the circulating water in the heat supply network circulating pipeline 41 is continuously circulated under the action of the heat supply network circulating pump, and the circulating water of the heat supply network tends to be scaled due to the accumulation of scaling factors in the circulating water in the long-term use process. The circulating water hardness meter C2 connected on the heat supply network circulating pipeline 41 can constantly monitor the hardness of the circulating water in the heat supply network circulating pipeline 41, and when the circulating water hardness meter C2 detects that the hardness of the circulating water exceeds a preset value, the heat supply network drain valve V5 can be opened to discharge circulating waste water with high hardness, and then the circulating waste water is supplemented by soft water in the soft water tank 3 until the water quality in the heat supply network circulating pipeline 41 is recovered.
Aiming at the characteristics of the water quality requirement of the heat supply network make-up water, the treatment device and the treatment method are adopted to treat the reverse osmosis concentrated water which is originally discharged as the waste water and then is used as the heat supply network make-up water, so that the comprehensive utilization of the waste water is realized, the real-time monitoring and automatic control on the whole system are realized, and the safe and stable operation of the heat supply network system is ensured. The implementation of the invention can realize the recycling of reverse osmosis concentrated water, reduce the investment and the operating cost of zero discharge of wastewater, take the zero discharge of reverse osmosis concentrated water of 30t/h as an example, and save the investment by about 3000 ten thousand yuan; meanwhile, the invention reduces the taking of raw water and saves water.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A heat supply network supplementing water treatment device is characterized by comprising a reverse osmosis device, a softening device, a storage device, a fresh water bypass, a PH adjusting device, a heat supply network circulating unit and a program control device; wherein:
the softening device comprises a sodium bed, the sodium bed is communicated with the water outlet end of the reverse osmosis device through a sodium bed water inlet pipeline, the sodium bed is communicated with the storage device through a sodium bed water outlet pipeline, and two ends of the fresh water bypass are respectively communicated with the water outlet end of the reverse osmosis device and the sodium bed water outlet pipeline; the storage device is communicated with the heat supply network circulating unit through a water supplementing pipeline, and the PH adjusting device is communicated with the water supplementing pipeline; and a heat supply network circulating pipeline is arranged in the heat supply network circulating unit.
2. The heat supply network supplementing water treatment device according to claim 1, wherein a softened water hardness meter C1 is connected to the sodium bed water outlet pipeline, the softened water hardness meter C1 is used for detecting softened water in the sodium bed water outlet pipeline, and the early warning value of the softened water hardness meter C1 is 0.5 mmol/L.
3. The heat supply network make-up water treatment device according to claim 1, wherein the reverse osmosis device is connected with a reverse osmosis concentrated water pipeline, the reverse osmosis concentrated water pipeline is communicated with the sodium bed through a sodium bed water inlet pipeline, a sodium bed water inlet valve V1 is arranged on the sodium bed water inlet pipeline, and a reverse osmosis concentrated water discharge valve V4 is arranged on the reverse osmosis concentrated water pipeline.
4. The heat supply network make-up water treatment device according to claim 1, wherein the reverse osmosis device is connected with a reverse osmosis fresh water pipeline, two ends of the fresh water bypass are respectively connected with the reverse osmosis fresh water pipeline and a sodium bed water outlet pipeline, and a sodium bed water outlet valve V2 is arranged on the sodium bed water outlet pipeline.
5. A heat supply network make-up water treatment device according to claim 1, wherein a fresh water bypass valve V3 is provided on the fresh water bypass.
6. A heat supply network make-up water treatment device as claimed in claim 1, wherein the storage device comprises a soft water tank, and a make-up water pump is connected to the make-up water pipeline; the PH adjusting device is a sodium hydroxide adding device and adjusts the PH value in the heat supply network circulating pipeline to 8-9.
7. The heat supply network supplementing water treatment device according to claim 1, wherein a circulating water hardness meter C2 is connected to the heat supply network circulating pipeline, a discharge pipeline is connected to the heat supply network circulating pipeline, and a heat supply network discharge valve V5 is connected to the discharge pipeline.
8. A method for processing supplementary water of a heat supply network is characterized by comprising the following steps,
the wastewater enters a reverse osmosis device for reverse osmosis to obtain reverse osmosis concentrated water and reverse osmosis fresh water, the reverse osmosis fresh water flows into a reverse osmosis fresh water pipeline to be used as boiler water or make-up water of a fresh water bypass, and the reverse osmosis concentrated water flows into a reverse osmosis concentrated water pipeline to be used as sodium bed water or to be discharged;
softening the reverse osmosis concentrated water by the sodium bed to obtain soft water, and sending the soft water into a soft water tank through a sodium bed water outlet pipeline for storage;
the soft water in the soft water tank is sent to the heat supply network circulation unit through a water replenishing pipeline to be used as replenishing water.
9. The method as claimed in claim 8, wherein when the softened water hardness table C1 detects that the softened soft water hardness value of the sodium bed is too high, the sodium bed stops feeding water, and the reverse osmosis concentrated water discharge valve V4 on the reverse osmosis concentrated water pipeline is opened for discharging reverse osmosis concentrated water; and a fresh water bypass valve V3 on the fresh water bypass is opened to replenish fresh water for the sodium bed water outlet pipeline and the soft water tank.
10. The method as claimed in claim 9, wherein when the softened water hardness table C1 detects that the softened soft water hardness value of the sodium bed is too high, the fresh water bypass valve V3 on the fresh water bypass is opened, and the reverse osmosis soft water is used to supplement the soft water of the supplementing water.
11. The method as claimed in claim 8, wherein when the hardness of the circulating water in the circulating water line of the heat supply network is detected to be too high by the circulating water hardness meter C2, the heat supply network drain valve V5 on the circulating water drain line is opened and drained.
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