CN211595337U - Zero-pollution-discharge capacity-increasing open-circuit circulating cooling water system - Google Patents
Zero-pollution-discharge capacity-increasing open-circuit circulating cooling water system Download PDFInfo
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- CN211595337U CN211595337U CN201922408203.5U CN201922408203U CN211595337U CN 211595337 U CN211595337 U CN 211595337U CN 201922408203 U CN201922408203 U CN 201922408203U CN 211595337 U CN211595337 U CN 211595337U
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Abstract
The utility model relates to a zero blowdown increase-volume's circulating cooling water system that opens a way, it includes the cold water pond, the heat exchanger, the cooling tower, low temperature evaporation heat transfer device, the cold water pond respectively with heat exchanger and cooling tower fluid connection, the heat exchanger respectively with cooling tower and low temperature evaporation heat transfer device fluid connection, low temperature evaporation heat transfer device and cold water pond fluid connection, low temperature evaporation heat transfer device is fountain heat exchanger, it includes the water tray with cold water pond fluid connection, via water pump and water tray fluid connection's spray set, be located spray set below and the condenser pipe that heat exchanger and cold water pond are connected respectively to upper end and lower extreme, and be provided with micrite clarifier in the water tray, be provided with electrochemistry scale removal device between water tray and cold water pond. The utility model discloses can realize opening a way the operation of zero blowdown of recirculating cooling water system, and reduce the heat dissipation load of cooling tower, stabilize cooling efficiency.
Description
The technical field is as follows:
the utility model relates to a circulating water treatment technical field, in particular to open a way recirculating cooling water system of zero blowdown increase-volume.
Background art:
recirculated cooling water is in open circuit recycling in-process, because the contact of water constantly with equipment, atmosphere, dust etc. causes quality of water to worsen, the suspended solid increases, ion concentration risees, the fungus alga increases, result in the interior scale deposit of equipment pipeline, the corruption, tendency such as fungus alga class microorganism reproduction, need throw various chemical agents to the system in, in order to slow down such trend, reach the purpose of stabilizing quality of water, moreover moisturizing, the displacement is big, economic benefits, environmental protection benefit is all relatively poor, the management maintenance degree of difficulty is big, the leading cause lies in:
1) the concentration times cannot be increased infinitely: because the water is continuously evaporated in the process of heat dissipation by contacting with the atmosphere, although the water quantity of the system is balanced by replenishing water energy, the evaporated water does not take away salt, so that the salt concentration in the water is continuously improved to form concentration of salt substances, the corrosion and scaling of equipment can be caused by the excessively high salt substances, and in order to reduce the influence of salt on the equipment, a cooling circulating water system has to forcibly discharge and control the water in the system by a certain concentration multiple according to the requirement of the equipment on the salt concentration;
2) the water quality is increasingly complex and severe, and the normal production operation is directly influenced: adding a water quality stabilizing agent according to the properties of circulating water to achieve the purposes of corrosion inhibition, scale inhibition, sterilization and algae removal;
3) in summer, due to high temperature, a large amount of new water with relatively low temperature needs to be supplemented, so that the operation with low concentration multiple is caused, and the sewage discharge amount is greatly increased;
4) in order to reduce sewage discharge and relieve the problem of water resource shortage, the sewage discharge of circulating water is generally sent to a comprehensive water plant for deep treatment, and is desalted by combining a double-membrane method (namely ultrafiltration and reverse osmosis), and then blended and recycled to a circulating water system to be used as make-up water, so that the practical problem is that the water quality greatly fluctuates; the double-membrane method has large investment and high operation cost, and the problem of the generated strong brine becomes a bottleneck troubling the development of enterprises.
The membrane method (namely, a double-membrane method of ultrafiltration and reverse osmosis) is used for desalting and recycling, and the process for treating strong brine by combining evaporation crystallization is combined, along with the salt enrichment in the waste water recycling treatment process, the equipment state is worse and lower, the water yield is lower and lower, the dosage of a treatment link is increased for maintaining the normal operation of a system, and the dosage of the system salt is increased, so that the treatment capacity and the treatment difficulty of the evaporation crystallization are increased, the whole water system is in a vicious circle, the daily operation cost, the membrane replacement, the final treatment of concentrated salt and other costs are increased gradually.
At present, zero discharge of wastewater is a prerequisite for construction and development of current industrial and mining enterprises, so that water treatment facilities such as wastewater treatment stations, reuse water stations, evaporative crystallization and the like which are constructed in a matched manner draw great attention and investment, and a circulating water treatment system which is an important ring in a reuse link of a whole plant water system usually does not draw enough attention, so that the defects of large one-time investment, high operation cost and the like of the whole plant water system are caused.
The utility model has the following contents:
in order to overcome the problems, the utility model provides an open circuit circulating cooling water system with zero pollution discharge and capacity increase so that the zero discharge of waste water is favorable.
In order to achieve the above object, the utility model provides a zero blowdown increase-volume open circuit recirculating cooling water system, it includes the cold water pond, a heat exchanger, the cooling tower, low temperature evaporation heat transfer device, the cold water pond respectively with heat exchanger and cooling tower fluid connection, the heat exchanger respectively with cooling tower and low temperature evaporation heat transfer device fluid connection, low temperature evaporation heat transfer device and cold water pond fluid connection, wherein, low temperature evaporation heat transfer device is spray heat exchanger, it includes the water tray with cold water pond fluid connection, via water pump and water tray fluid connection's spray set, be located the condenser pipe that heat exchanger and cold water pond are connected respectively to spray set below and upper end and lower extreme, and, be provided with the micrite clarifier in the water tray, be provided with electrochemical scale removal device between water tray and cold water pond.
Further, the cooling tower is a conventional industrial cooling tower.
Still further, the spray type heat exchanger is a spray type dividing wall heat exchanger.
Still further, the electrochemical descaling device is a bypass device and is used for treating sewage of the zero-pollution-discharge capacity-increased open-circuit circulating cooling water system at one time.
Compared with the prior art, the utility model has the following advantages:
the low-temperature evaporation heat exchange device evaporates the sewage concentrated by a certain multiple (for example, N times) from the cold water tank, so that the low-concentration-multiple zero-sewage operation of the circulating cooling water system is realized, the heat dissipation load of the cooling tower is reduced, the cooling efficiency is improved, and the capacity of the open-circuit circulating cooling water system is equivalently expanded;
sewage from the cold water pool is pretreated by the electrochemical descaling device before entering the low-temperature evaporation heat exchange system for evaporation, a water quality stabilizer in the sewage can be consumed by using strong scaling substances in the electrochemical descaling device, and the sewage flowing out of the electrochemical descaling device (namely the effluent of the electrochemical descaling device) serves as a cold source and enters the low-temperature evaporation heat exchange device for heat absorption and evaporation;
in the low-temperature evaporation heat exchange device, the sewage is sprayed onto the condenser pipe, namely the spray water absorbs the heat of the high-temperature circulating water which is shunted from the heat exchanger and flows in the condenser pipe, and the heat is dissipated through evaporation; because the water vapor carries a small amount of highly concentrated sewage to be dispersed, the soluble salt of the spray water in the low-temperature evaporation heat exchange device can reach the natural limit;
the microcrystal purifier is placed in a water tray of the low-temperature evaporation heat exchange device, most of carbonate scale can be separated out, and the cleanness of an evaporation heat exchange surface and a filler heat dissipation surface of the spray type dividing wall heat exchanger is ensured.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
Description of the drawings:
the structure of the invention, together with further objects and advantages thereof, will best be understood from the following description taken in conjunction with the accompanying drawings, in which like reference characters identify like elements:
FIG. 1 is a schematic diagram of a zero blowdown augmented open circuit recirculating cooling water system according to one embodiment of the present invention;
fig. 2 is a schematic structural diagram of a low-temperature evaporation heat exchange device of the zero-pollution-discharge capacity-increased open-circuit circulating cooling water system shown in fig. 1.
The specific implementation mode is as follows:
the following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
According to the utility model discloses a zero blowdown increase-volume open circuit recirculating cooling water system of embodiment is shown in fig. 1, and it includes cold water pool 1, heat exchanger 2, cooling tower 3, low temperature evaporation heat transfer device 4, and cold water pool 1 respectively with heat exchanger 2 and 3 fluid coupling of cooling tower, heat exchanger 2 respectively with cooling tower 3 and 4 fluid coupling of low temperature evaporation heat transfer device, low temperature evaporation heat transfer device 4 and cold water pool 1 fluid coupling. The cooling tower 3 in this embodiment is a conventional industrial cooling tower.
As shown in fig. 2, in the present embodiment, the low-temperature evaporation heat exchange device 4 is a shower partition wall heat exchanger, and includes a water tray 41 fluidly connected to the cold water tank 1, a shower device 43 fluidly connected to the water tray 41 via a water pump 42, and a condenser pipe 44 located below the shower device 43 and having an upper end and a lower end connected to the heat exchanger 2 and the cold water tank 1, respectively, wherein the upper end of the condenser pipe 44 is provided with an inlet 442 for receiving high-temperature circulating water from the heat exchanger 2, the lower end is provided with a cooled circulating water outlet 441 communicated with the cold water tank 1, and the shower device 43 is configured to spray sewage from the cold water tank 1 onto the condenser pipe 44.
It should be understood that the low-temperature evaporation heat exchange device 4 is a device which combines a water-cooled cooler and an open cooling tower and discharges heat to air, the core of the device is a spray type dividing wall heat exchanger (commonly called a closed cooling tower), cooled high-temperature circulating water flows inside the spray type dividing wall heat exchanger, namely flows in a condensation pipe 44, and sewage from the cold water pool 1 flows as spray water outside the spray type dividing wall heat exchanger; the heat of the circulating water is transmitted to the spray water through the wall surface of the heat exchanger of the spray type dividing wall heat exchanger, and the spray water is evaporated and radiated by a water film (including convection). The heat transfer links are few, the required heat transfer temperature difference is small, and expected heat can be released.
As shown in fig. 2, in the present embodiment, high-temperature circulating water flows through the condenser pipe 44 of the low-temperature evaporation heat exchanger 4, and the high-temperature circulating water flows back and forth along the pipe from top to bottom; the shower water sprayed from the spray device 43 flows outside the condensation duct 44, and also flows from top to bottom due to gravity. In addition, as shown in fig. 2, the low-temperature evaporation heat exchange device 4 is further provided with an air inlet 45, an air outlet 46 and a fan 47 located near the air outlet 46, and the cold air outside the condensation pipe 44 is sucked from bottom to top by the top suction of the fan 47 and flows out through the air outlet 46.
Further, as shown in fig. 1, a microcrystalline purifier 5 is further arranged in a water tray 41 of the low-temperature evaporation heat exchange device 4, and an electrochemical descaling device 6 is further arranged between the water tray 41 and the cold water tank 1. In the present embodiment, the technology of the microcrystalline purifier 5 is disclosed in the patent application entitled "microcrystalline purifier" with application number 201710260053.0, which has application date of 2017, 4 and 20, and is capable of inducing condensation of scale to combine into fine and compact particles, which do not adhere to the evaporation heat dissipation surface of the condenser tube 44, and which directionally concentrate on the bottom slow flow region of the low temperature evaporation heat exchange device 4 to deposit and stabilize the operation efficiency, and the technology of the microcrystalline purifier is incorporated herein, and thus will not be described in detail.
In addition, in the embodiment, the sewage is pretreated by the electrochemical descaling device 6, partial scale is separated out, 10-15% of hardness can be removed, and the effect of stable water quality is resolved. The main action mechanism of the electrochemical descaling device 6 is as follows: through the direct current electrolysis of water, oxidation reaction occurs at the anode to generate OH and H2O2、O3、HClO、CLO2The organic phosphine water quality stabilizer can reduce partial chloride ions in water and promote decomposition of the organic phosphine water quality stabilizer; the cathode generates reduction reaction to generate OH < - >, carbonate is promoted to be scaled and separated out, and a small amount of organic matters in the circulating water are removed by direct oxidation of the polar plate and indirect oxidation of an active intermediate product.
In the present embodiment, the electrochemical descaling device 6 is a bypass flow type device and is used for one-time treatment of the sewage of the zero-pollution-discharge capacity open-circuit circulating cooling water system.
The operation of the open-circuit circulating cooling water system according to the present embodiment is described as follows:
circulating water in the cold water pool 1 is circulated as circulating water quantity QCirculation typeSending the circulating water into a heat exchanger 2, wherein the heat exchanger 2 can be a blast furnace cooling device for example, the circulating water is heated after heat exchange in the heat exchanger 2, and part of high-temperature circulating water from the heat exchanger 2 is high-temperature circulating water quantity Q1Sending the water to a condensing pipe 44 of the low-temperature evaporation heat exchange device 4, and circulating the other part of the water with high temperature Q2Sent to the cooling tower 3;
the sewage in the cold water pool 1 is discharged as the sewage discharge quantity QBFirstly, the water is sent to an electrochemical descaling device 6 for pretreatment, part of scale forming ions are removed, and the influence of a circulating water quality stabilizer is eliminated;
high temperature circulating water Q from heat exchanger 21The water enters the condensation pipe 44 through the inlet 442, flows from top to bottom, is cooled and then returns to the cold water tank 1 through the outlet 441, in the process, the outlet water of the electrochemical descaling device 6 enters the water tray 41 of the low-temperature evaporation heat exchange device 4, is sent to the spraying device 43 through the water pump 42 and is sprayed outside the condensation pipe 44 from top to bottom, is evaporated on the condensation pipe 44, and realizes zero discharge of sewage, and the circulating water in the condensation pipe 44 cooled by the spraying water from the spraying device 43 finally returns to the cold water tank 1 through the outlet 441;
in the working process of the low-temperature evaporation heat exchange device 4, the microcrystal purifier 5 arranged in the water tray also works to separate out most scaling substances in the spray water, so that the evaporation heat exchange surface and the filler heat dissipation surface of the condensing pipe 44 are clean.
In addition, as shown in fig. 1, the open-circuit circulating cooling water system may further include a scale holding device 7, and the scale holding device 7 may hold carbonate scale, silt scale, and other scales generated by the microcrystal purifier 5 and the electrochemical descaling device 6.
While the invention has been described with reference to the above embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the above-described arrangements, including combinations of features disclosed herein either individually or in any combination as is evident from the below disclosure. These variants and/or combinations fall within the technical field of the present invention and are intended to be protected by the following claims.
Claims (5)
1. The utility model provides a zero blowdown increase-volume open circuit recirculating cooling water system, its characterized in that includes the cold water pond, the heat exchanger, the cooling tower, low temperature evaporation heat transfer device, the cold water pond respectively with heat exchanger and cooling tower fluid coupling, the heat exchanger respectively with cooling tower and low temperature evaporation heat transfer device fluid coupling, low temperature evaporation heat transfer device and cold water pond fluid coupling, wherein, low temperature evaporation heat transfer device is spray heat exchanger, it includes the water tray with cold water pond fluid coupling, spray set via water pump and water tray fluid coupling, be located spray set below and the upper end and the lower extreme condenser pipe of connecting heat exchanger and cold water pond respectively, and, be provided with micrite clarifier in the water tray, be provided with electrochemical scale removal device between water tray and cold water pond.
2. The zero blowdown compatibilized open circuit circulating cooling water system of claim 1, wherein the cooling tower is a conventional industrial cooling tower.
3. The zero blowdown compatibilized open circuit recirculating cooling water system of claim 1 or 2, wherein the trickle heat exchanger is a trickle partition wall heat exchanger.
4. The zero blowdown compatibilized open circulating cooling water system of claim 1 or 2, wherein the electrochemical descaling device is a bypass flow device.
5. The zero blow-off compatibilized open-circuit recirculating cooling water system of claim 3, wherein the electrochemical descaling device is a bypass flow device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922408203.5U CN211595337U (en) | 2019-12-28 | 2019-12-28 | Zero-pollution-discharge capacity-increasing open-circuit circulating cooling water system |
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| CN201922408203.5U CN211595337U (en) | 2019-12-28 | 2019-12-28 | Zero-pollution-discharge capacity-increasing open-circuit circulating cooling water system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113379171A (en) * | 2021-08-16 | 2021-09-10 | 中冶节能环保有限责任公司 | Method and device for allocating open-circuit circulating water system |
| CN113772864A (en) * | 2021-08-30 | 2021-12-10 | 上海润风智能科技有限公司 | Zero-emission process method for more efficiently utilizing waste heat |
| CN114234667A (en) * | 2021-12-24 | 2022-03-25 | 益冷和众科技(北京)有限公司 | Cooling tower and system for wastewater recycling |
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2019
- 2019-12-28 CN CN201922408203.5U patent/CN211595337U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113379171A (en) * | 2021-08-16 | 2021-09-10 | 中冶节能环保有限责任公司 | Method and device for allocating open-circuit circulating water system |
| CN113379171B (en) * | 2021-08-16 | 2022-01-25 | 中冶节能环保有限责任公司 | Method and device for allocating open-circuit circulating water system |
| CN113772864A (en) * | 2021-08-30 | 2021-12-10 | 上海润风智能科技有限公司 | Zero-emission process method for more efficiently utilizing waste heat |
| CN114234667A (en) * | 2021-12-24 | 2022-03-25 | 益冷和众科技(北京)有限公司 | Cooling tower and system for wastewater recycling |
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