CN213295526U - System for preparing chlorine by electrolyzing seawater - Google Patents
System for preparing chlorine by electrolyzing seawater Download PDFInfo
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- CN213295526U CN213295526U CN202021602100.9U CN202021602100U CN213295526U CN 213295526 U CN213295526 U CN 213295526U CN 202021602100 U CN202021602100 U CN 202021602100U CN 213295526 U CN213295526 U CN 213295526U
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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
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Abstract
The invention discloses a system for preparing chlorine by electrolyzing seawater, which comprises: the device comprises a seawater pretreatment device, a power device, a heat exchange device, a seawater electrolysis chlorine preparation device and a dosing device; the seawater pretreatment device is used for pretreating seawater to obtain pretreated seawater; the power device provides power for the seawater electrolysis chlorine preparation device; the heat exchange device is arranged on the power device, a fluid channel is arranged in the heat exchange device, and an inlet of the fluid channel is communicated with an outlet of the seawater pretreatment device and is used for exchanging heat of the pretreated seawater through waste heat of the power device to obtain preheated seawater; the seawater electrolysis chlorine preparation device is communicated with the outlet of the heat exchange device and is used for preparing chlorine from the preheated seawater to obtain a sodium hypochlorite solution; the invention utilizes the waste heat of the power device to heat the pretreated seawater, reduces the energy consumption and can effectively solve the problem of low temperature of the seawater of the operation source of the seawater chlorine system in winter.
Description
Technical Field
The invention relates to the technical field of seawater treatment, in particular to a system for preparing chlorine by electrolyzing seawater.
Background
The device for preparing chlorine by electrolyzing seawater transforms and rectifies AC10KV AC into DC through a rectifier transformer and a rectifier, applies the DC to the cathode and the anode of a seawater electrolytic tank to electrolyze seawater to generate active effective chlorine, and adds the active effective chlorine into unit cooling seawater to solve the problems that marine organisms and bacteria and algae are attached and propagated on a cooling water pipeline and a condenser pipe, the water delivery capacity is influenced by reducing the flow area, the cooling efficiency of the condenser is reduced, the unit is forced to reduce the load and operate to influence power generation, and the like. The current efficiency is reduced due to the rapid reduction of the conductivity when the temperature of the seawater is too low, the voltage of the cell is increased, and the service life of the anode plate is influenced. According to GB/T22839-2010 technical conditions for electrolytic seawater sodium hypochlorite generation devices, the seawater temperature is not less than 10 ℃, a large number of data show that the temperature for preparing chlorine by electrolyzing seawater is controlled to be 10-40 ℃, the temperature of the seawater is generally below 10 ℃ in 11-3 months, and the minimum value can be as low as-2.4 ℃. Meanwhile, seawater which is subjected to direct-current cooling by a condenser of the power device is directly discharged into the sea after aeration, and heat energy is wasted.
Therefore, in order to solve the above problems, it is necessary to develop a system for preparing chlorine from seawater by electrolysis, which provides a stable water source for preparing chlorine from seawater by electrolysis and simultaneously recycles the waste heat of seawater discharged from the power plant.
Disclosure of Invention
The invention aims to provide a seawater electrolysis chlorine production system, which utilizes the waste heat of a power device to heat pretreated seawater, reduces energy consumption, can effectively solve the problem that the seawater temperature of an operation source of the seawater electrolysis chlorine production system in winter is low, and improves the current efficiency and chlorine production efficiency in seawater electrolysis.
In order to achieve the above object, the present invention provides a system for producing chlorine by electrolyzing seawater, the method comprising:
the device comprises a seawater pretreatment device, a power device, a heat exchange device, a seawater electrolysis chlorine preparation device and a dosing device;
the seawater pretreatment device is used for pretreating seawater to obtain pretreated seawater;
the power device provides power for the seawater electrolysis chlorine preparation device;
the heat exchange device is arranged on the power device, a fluid channel is arranged in the heat exchange device, and an inlet of the fluid channel is communicated with an outlet of the seawater pretreatment device and is used for exchanging heat of the pretreated seawater through waste heat of the power device to obtain preheated seawater;
the seawater electrolysis chlorine preparation device is communicated with the outlet of the heat exchange device and is used for preparing chlorine from the preheated seawater to obtain a sodium hypochlorite solution;
the chemical adding device comprises a liquid storage device and a chemical adding pipe, wherein an inlet of the liquid storage device is communicated with an outlet of the seawater electrolysis chlorine production device and is used for placing the sodium hypochlorite solution; one end of the dosing pipe is communicated with an outlet of the liquid storage device, and the other end of the dosing pipe is communicated with an inlet of the seawater pretreatment device.
Further, the seawater pretreatment device comprises a mechanical grating machine and a first filtering device which are sequentially communicated, and an outlet of the first filtering device is communicated with the heat exchange device.
Further, first filter equipment is rotary filter screen, the export of machinery grid machine with rotary filter screen's entry is linked together, rotary filter screen's export with heat transfer device is linked together.
Further, the heat exchange device comprises a seawater lifting pump, a second filtering device and a heat exchanger which are sequentially communicated.
And furthermore, the heat exchanger comprises a condenser heat exchanger and a plate heat exchanger, an inlet of the condenser heat exchanger and an inlet of the plate heat exchanger are communicated with an outlet of the second filtering device, and an outlet of the condenser heat exchanger and an outlet of the plate heat exchanger are communicated with an inlet of the seawater electrolysis chlorine production device.
Furthermore, the second filtering device is a backwashing filtering device, the seawater lifting pump is communicated with an inlet of the backwashing filtering device, and an outlet of the backwashing filtering device is communicated with an inlet of the heat exchanger.
Further, the seawater electrolysis chlorine preparation device comprises a plurality of electrolysis cell banks which are arranged in parallel.
Further, the system for preparing chlorine by electrolyzing seawater also comprises a pickling device, wherein the pickling device comprises an acid liquor storage tank and an acid liquor conveying pipe, one end of the acid liquor conveying pipe is communicated with the acid liquor storage tank, and the other end of the acid liquor conveying pipe is communicated with the device for preparing chlorine by electrolyzing seawater.
Further, one end of the dosing pipe communicated with the liquid storage device is arranged at the bottom of the liquid storage device.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the seawater electrolysis chlorine production system, seawater is treated by the seawater pretreatment device to obtain pretreated seawater, the pretreated seawater passes through the heat exchange device and then enters the seawater electrolysis chlorine production device, the pretreated seawater is heated by using waste heat of the power device, energy consumption is reduced, the problem that the seawater temperature of the seawater electrolysis seawater chlorine production system in winter is low can be effectively solved, the current efficiency and chlorine production efficiency in seawater electrolysis are improved, and meanwhile, a part of sodium hypochlorite solution is returned to the seawater pretreatment device by using the liquid storage device and the chemical feeding pipe to be recycled as the sterilization algicide.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a block diagram of a system for producing chlorine by electrolyzing seawater according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for producing chlorine by electrolyzing seawater according to another embodiment of the present invention;
1. a seawater pretreatment device; 11. a mechanical grilling machine; 12. a first filtering device; 2. a power plant; 3. a heat exchange device; 31. a seawater lift pump; 32. a second filtering device; 33. a third filtering device; 34. a condenser heat exchanger; 35. a plate heat exchanger; 4. a device for producing chlorine by electrolyzing seawater; 5. a dosing device; 51. a liquid storage device; 52. a medicine feeding pipe; 6. a pickling device; 61. an acid liquor storage tank; 62. an acid liquor conveying pipe.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the embodiment of the invention provides a system for preparing chlorine by electrolyzing seawater, which comprises the following components as shown in figure 1:
the system comprises a seawater pretreatment device 1, a power device 2, a heat exchange device 3, a seawater electrolysis chlorine preparation device 4 and a chemical adding device 5;
the seawater pretreatment device 1 is used for pretreating seawater to obtain pretreated seawater;
the power device 2 is used for providing power for the seawater electrolysis chlorine preparation device;
the heat exchange device 3 is arranged on the power device 2, a fluid channel is arranged in the heat exchange device 3, an inlet of the fluid channel is communicated with an outlet of the seawater pretreatment device 4, and the heat exchange device is used for exchanging heat of the pretreated seawater through waste heat of the power device to obtain preheated seawater;
the seawater electrolysis chlorine preparation device 4 is communicated with an outlet of the heat exchange device 3 and is used for preparing chlorine from the preheated seawater to obtain a sodium hypochlorite solution;
the chemical adding device 5 comprises a liquid storage device 51 and a chemical adding pipe 52, wherein an inlet of the liquid storage device 51 is communicated with an outlet of the seawater electrolysis chlorine production device 4 and is used for placing the sodium hypochlorite solution; one end of the dosing pipe 52 is communicated with the outlet of the liquid storage device 51, and the other end is communicated with the inlet of the seawater pretreatment device 1.
The embodiment of the invention provides a working process of a system for preparing chlorine by electrolyzing seawater, which comprises the following steps:
the seawater is pretreated by the seawater pretreatment device 1 to obtain pretreated seawater;
the pretreated seawater enters the heat exchange device 3 to exchange heat with the pretreated seawater through the waste heat of the power device, so as to obtain preheated seawater;
the preheated seawater enters the seawater electrolysis chlorine production device 4 to produce chlorine, and sodium hypochlorite solution is obtained; the pre-treated seawater is heated by utilizing the waste heat of the power device, the energy consumption is reduced, the problem that the temperature of the seawater of the operation source of the seawater chlorine system for electrolyzing seawater in winter is low can be effectively solved, and the current efficiency and chlorine production efficiency in seawater electrolysis are improved.
The sodium hypochlorite solution enters the liquid storage device 51 for storage, flows into the inlet of the seawater pretreatment device 1 through the dosing pipe, and returns a part of the sodium hypochlorite solution to the seawater pretreatment device for cyclic utilization as a sterilization algicide.
Preferably, the seawater pretreatment device 1 comprises a mechanical grating machine 11 and a first filtering device which are sequentially communicated, and an outlet of the first filtering device is communicated with the heat exchange device. And (3) the seawater enters the mechanical grating machine for preliminary filtration to remove large-particle substances larger than 5cm in the seawater. The body and the filter screen of the first filter device are made of seawater corrosion resistant materials (such as 316L).
More preferably, the first filtering device is a rotary screen, the outlet of the mechanical grid machine 11 is communicated with the inlet of the rotary screen 12, and the outlet of the rotary screen 12 is communicated with the heat exchanging device 3. And the seawater enters the rotary filter screen for further filtration, and particulate matters larger than 5mm in the seawater are removed.
Preferably, the heat exchange device 3 comprises a seawater lift pump 31, a second filtering device 32 and a heat exchanger (34, 35) which are communicated in sequence.
Preferably, the second filtering device is a backwashing filtering device, the seawater lift pump 31 is communicated with an inlet of the backwashing filtering device, and an outlet of the backwashing filtering device is communicated with an inlet of the heat exchanger. And the seawater enters the backwashing filter for further filtration to remove particulate matters larger than 1mm in the seawater. The body and the filter screen of the backwashing filter device are made of seawater corrosion resistant materials (such as 316L).
As shown in fig. 2, the heat exchange device 3 further includes a third filtering device 33, the heat exchange device 3 includes a seawater lift pump 31, a second filtering device 32, heat exchangers (34, 35) and the third filtering device 33 which are sequentially communicated, and the third filtering device 33 further filters the seawater coming out of the heat exchange device, so as to protect the electrolytic cell.
Specifically, the body and the filter screen of the third filtering device 33 are made of seawater corrosion resistant materials (for example, 316L), and the third filtering device includes a seawater pre-filter and an automatic backwashing filter. And the seawater enters the third filter for further filtration to remove particulate matters larger than 0.5mm in the seawater. The outlet of the heat exchange device is communicated with the inlet of the seawater pre-filter, the outlet of the seawater pre-filter is communicated with the inlet of the automatic backwashing filter, and the outlet of the automatic backwashing filter is communicated with the inlet of the electrolytic cell.
Preferably, the heat exchanger comprises a condenser heat exchanger 34 and a plate heat exchanger 35, an inlet of the condenser heat exchanger 34 and an inlet of the plate heat exchanger 35 are both communicated with an outlet of the second filtering device, and an outlet of the condenser heat exchanger 34 and an outlet of the plate heat exchanger 35 are both communicated with an inlet of the seawater electrolysis chlorine production device 4.
The pretreated seawater is subjected to heat exchange through a condenser heat exchanger 34 and a plate heat exchanger 35 to obtain preheated seawater, and the temperature of the preheated seawater is 20-30 ℃. When the temperature of the seawater is too low (lower than 10 ℃), the current efficiency of the electrolytic cell is low, and the coating of the anode plate is accelerated to fall off. Within the temperature range of 20-30 ℃, the efficiency of producing chlorine by electrolyzing seawater to prepare chlorine is high, the device runs stably, and the device is energy-saving and environment-friendly.
Preferably, the seawater electrolysis chlorine production device comprises a plurality of electrolysis cell banks arranged in parallel. The multiple groups of electrolytic cell banks can electrolyze to produce chlorine simultaneously, so that the chlorine production efficiency is improved. When seawater containing chloride ions flows through the electrolytic cell, direct current is supplied to the electrolytic cell, and the following reactions are generated in the electrolytic cell:
and (3) anode reaction:
2Cl-→Cl2+2e
and (3) cathode reaction:
2H2O+2e→2OH-+H2↑
chemical reaction between electrodes:
(1)Cl2+2OH-＝ClO-+Cl-+H2O
(2)ClO-+H2O＝HClO+OH-
(3)HClO＝H++ClO-
and (3) total reaction:
NaCl+H2O→NaClO+H2↑
HClO、ClO-collectively referred to as available chlorine, prevents the growth of marine organisms in a seawater system.
Preferably, the system for preparing chlorine by electrolyzing seawater further comprises a pickling device 6, wherein the pickling device 6 comprises an acid liquor storage tank 61 and an acid liquor conveying pipe 62, one end of the acid liquor conveying pipe 62 is communicated with the acid liquor storage tank 61, and the other end of the acid liquor conveying pipe 62 is communicated with the device 4 for preparing chlorine by electrolyzing seawater.
Preferably, one end of the dosing pipe communicated with the liquid storage device is arranged at the bottom of the liquid storage device. This is provided in order to minimise the tank volume at the point of meeting production requirements.
The dosing point is arranged in the seawater taking runner. When the liquid level of the storage tank reaches the liquid level of 2.5m, the continuous dosing pump can be started to dose. The adding concentration is 1ppm/L, and the residual chlorine amount at the outlet of the condenser is controlled to be 0.03 ppm/L. When the liquid level of the storage tank reaches the liquid level of 5.0m, an impact dosing pump is started to dose, the dosing concentration is 3ppm/L, and the impact dosing is stopped when the liquid level reaches the low liquid level. When the liquid level of the storage tank reaches the high liquid level, the upper computer sends out an alarm.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A system for producing chlorine by electrolyzing seawater is characterized by comprising: the device comprises a seawater pretreatment device, a power device, a heat exchange device, a seawater electrolysis chlorine preparation device and a dosing device;
the seawater pretreatment device is used for pretreating seawater to obtain pretreated seawater;
the power device provides power for the seawater electrolysis chlorine preparation device;
the heat exchange device is arranged on the power device, a fluid channel is arranged in the heat exchange device, and an inlet of the fluid channel is communicated with an outlet of the seawater pretreatment device and is used for exchanging heat of the pretreated seawater through waste heat of the power device to obtain preheated seawater;
the seawater electrolysis chlorine preparation device is communicated with an outlet of the heat exchange device and is used for preparing chlorine from the preheated seawater to obtain a sodium hypochlorite solution:
the chemical adding device comprises a liquid storage device and a chemical adding pipe, wherein an inlet of the liquid storage device is communicated with an outlet of the seawater electrolysis chlorine production device and is used for placing the sodium hypochlorite solution; one end of the dosing pipe is communicated with an outlet of the liquid storage device, and the other end of the dosing pipe is communicated with an inlet of the seawater pretreatment device.
2. The system for producing chlorine by electrolyzing seawater as claimed in claim 1, wherein the seawater pretreatment device comprises a mechanical grating machine and a first filtering device which are connected in sequence, and the outlet of the first filtering device is connected with the heat exchange device.
3. The system for producing chlorine by electrolyzing seawater as claimed in claim 2, wherein the first filtering device is a rotary screen, the outlet of the mechanical grilling machine is connected to the inlet of the rotary screen, and the outlet of the rotary screen is connected to the heat exchanging device.
4. The system for producing chlorine by electrolyzing seawater as recited in claim 1, wherein said heat exchanging device comprises a seawater lift pump, a second filtering device and a heat exchanger which are connected in sequence.
5. The system for producing chlorine by electrolyzing seawater according to claim 4, wherein the heat exchanger comprises a condenser heat exchanger and a plate heat exchanger, an inlet of the condenser heat exchanger and an inlet of the plate heat exchanger are both communicated with an outlet of the second filtering device, and an outlet of the condenser heat exchanger and an outlet of the plate heat exchanger are both communicated with an inlet of the device for producing chlorine by electrolyzing seawater.
6. The system for producing chlorine by electrolyzing seawater as recited in claim 4, wherein said second filtering device is a backwashing filtering device, said seawater lift pump is connected to an inlet of said backwashing filtering device, and an outlet of said backwashing filtering device is connected to an inlet of said heat exchanger.
7. The seawater electrolysis chlorine generating system as claimed in claim 1, wherein the seawater electrolysis chlorine generating device comprises a plurality of electrolytic cell banks arranged in parallel.
8. The system for producing chlorine by electrolyzing seawater as recited in claim 1, further comprising a pickling device, said pickling device comprising an acid liquor storage tank and an acid liquor delivery pipe, said acid liquor delivery pipe being in communication with said acid liquor storage tank at one end and with said device for producing chlorine by electrolyzing seawater at the other end.
9. The seawater electrolysis chlorine production system as claimed in claim 1, wherein one end of the dosing pipe communicated with the liquid storage device is arranged at the bottom of the liquid storage device.
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| CN202021602100.9U CN213295526U (en) | 2020-08-05 | 2020-08-05 | System for preparing chlorine by electrolyzing seawater |
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| CN202021602100.9U CN213295526U (en) | 2020-08-05 | 2020-08-05 | System for preparing chlorine by electrolyzing seawater |
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