A control method for multi-mode operation of a seawater electrolysis system for producing chlorine

Abstract

The present application relates to a kind of control method of electrolytic seawater chlorine system multi-mode operation, the control method includes: S1, the temperature of cooling seawater is detected, if seawater temperature <9 ℃, then electrolytic seawater chlorine system stops running, otherwise the flow of cooling circulating water is obtained;S2, with the flow of cooling circulating water and the temperature of cooling seawater to determine the dosing amount of circulating water, and according to the effective chlorine ratio of dosing amount of circulating water to calculate, according to the effective chlorine ratio to determine the running current of electrolytic cell in electrolytic seawater chlorine system.This method determines the dosing amount of circulating water according to seawater temperature, circulating water flow, adjusts the running current of electrolytic seawater chlorine system according to effective chlorine content, which is beneficial to accurately determine the running current and flow of electrolytic equipment in operation, effectively reduces the influence of reagent on environment and production cost.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production by seawater electrolysis, and more specifically to a control method for multi-mode operation of a chlorine production system by seawater electrolysis. Background Technology

[0002] Currently, coastal power plants are designed with a direct-current seawater cooling circulating water system as the power plant's cold source, and a seawater electrolysis chlorine production system is designed simultaneously to prepare biocides to inhibit marine organisms from attaching to the circulating water heat exchange system equipment.

[0003] For example, CN213295526U discloses an electrolytic seawater chlorine production system, including: a seawater pretreatment device, a power unit, a heat exchange device, an electrolytic seawater chlorine production device, and a dosing device; the seawater pretreatment device is used to pretreat seawater to obtain pretreated seawater; the power unit provides power to the electrolytic seawater chlorine production device; the heat exchange device is installed on the power unit, and the heat exchange device has a fluid channel, the inlet of which is connected to the outlet of the seawater pretreatment device, for exchanging heat with the waste heat of the power unit to obtain preheated seawater; the electrolytic seawater chlorine production device is connected to the outlet of the heat exchange device, for producing chlorine from the preheated seawater to obtain sodium hypochlorite solution; this solution utilizes the waste heat of the power unit to heat the pretreated seawater, reducing energy consumption and effectively solving the problem of low source seawater temperature during winter operation of the electrolytic seawater chlorine production system.

[0004] CN202576053U discloses an electrolytic seawater antifouling device, belonging to the technical field of electrolytic seawater antifouling device structure. The electrolytic seawater antifouling device is characterized by having a seawater booster pump (1) for transporting cooling seawater and a cooling water pump (8) for the cooling system connected to the seawater. One end of the seawater booster pump (1) is connected to seawater, and the other end is connected to an electrolytic cell (3) via a disc filter (2). The output from the electrolytic cell (3) is connected to a storage tank (5) with a hydrogen removal fan (6) on one side. The storage tank (5) is connected to the intake of the cooling water pump (8) of the cooling system in the seawater via a dosing pump. This scheme utilizes the chloride contained in natural seawater to electrolyze seawater using specially designed electrodes to generate effective chlorine. The effective chlorine can stun or kill marine organisms and their spores and larvae, thereby preventing the attachment and growth of marine organisms in pipelines and cooling water systems. This method is suitable for power plants, nuclear power plants, chemical plants, and ships that use seawater as cooling water along the coast.

[0005] However, at present, the number of electrolysis equipment and the current are controlled according to the concentration of circulating water dosing. The current and number of electrolysis cells are selected according to the dosage of circulating water dosing concentration of 0.1-0.5 mg / L. The control range is large. When the circulating water dosing dosage is at the high limit, the dosage is large and the operating cost is high. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of this invention is to provide a control method for multi-mode operation of an electrolytic seawater chlorination system, so as to solve the problems of unreasonable chemical dosage in circulating water cooling, high operating cost of electrolytic chlorination system, and great environmental impact.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] This invention provides a control method for multi-mode operation of a seawater electrolysis chlorine production system, the control method comprising:

[0009] S1. Detect the temperature of the seawater used for cooling. If the seawater temperature is <9℃, the seawater electrolysis chlorine production system will stop operating; otherwise, obtain the flow rate of the circulating water used for cooling.

[0010] S2. Determine the dosage of circulating water based on the flow rate of the cooling circulating water and the temperature of the cooling seawater, calculate the effective chlorine ratio based on the dosage of circulating water, determine the operating current of the electrolyzer in the seawater electrolysis chlorination system based on the effective chlorine ratio, and detect the residual chlorine value of the circulating water siphon well. If the detected residual chlorine value meets the preset residual chlorine value, continue operation; otherwise, adjust the operating current of the electrolyzer in the electrolysis chlorination system until the residual chlorine value of the circulating water siphon well meets the preset residual chlorine value.

[0011] The control method provided by this invention determines the dosage of chemicals in the circulating water system based on the temperature of the cooling seawater and the flow rate of the circulating water. It also adjusts the operating current of the seawater electrolysis chlorination system according to the available chlorine content, facilitating precise determination of the operating current and flow rate of the electrolysis equipment. While ensuring the biocidal effect of the circulating water system, it reduces the environmental impact of the chemicals. Precise control of the seawater electrolysis chlorination operation based on seawater temperature and circulating water flow rate saves 2.3 million yuan in chlorination production costs annually.

[0012] As a preferred technical solution of the present invention, if the detected seawater temperature is 9-17.4℃, then the circulating water flow rate is controlled to be 2 / 3 of the rated circulating water flow rate, and the circulating water dosage is 0.25-1.06mg / L.

[0013] In this invention, the detected seawater temperature is 9-17.4℃, for example, it can be 9℃, 9.5℃, 10℃, 10.5℃, 11℃, 11.5℃, 12℃, 12.5℃, 13℃, 13.5℃, 14℃, 14.5℃, 15℃, 15.5℃, 16℃, 16.5℃, 17℃ or 17.4℃, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0014] In this invention, the dosage of the circulating water is 0.25-1.06 mg / L, for example, it can be 0.25 mg / L, 0.3 mg / L, 0.35 mg / L, 0.4 mg / L, 0.45 mg / L, 0.5 mg / L, 0.55 mg / L, 0.6 mg / L, 0.65 mg / L, 0.7 mg / L, 0.75 mg / L, 0.8 mg / L, 0.85 mg / L, 0.9 mg / L, 0.95 mg / L, or 1.06 mg / L, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0015] As a preferred technical solution of the present invention, if the detected seawater temperature is 17.5-22℃, then the circulating water flow rate is controlled to the rated circulating water flow rate, and the circulating water dosage is 1.1-1.15mg / L.

[0016] In this invention, the detected seawater temperature is 17.5-22℃, for example, it can be 17.5℃, 17.5℃, 18℃, 18.5℃, 19℃, 19.5℃, 20℃, 20.5℃, 21℃, 21.5℃ or 22℃, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0017] In this invention, the dosage of the circulating water is 1.1-1.15 mg / L, for example, it can be 1.1 mg / L, 1.11 mg / L, 1.12 mg / L, 1.13 mg / L, 1.14 mg / L or 1.15 mg / L, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0018] As a preferred technical solution of the present invention, if the detected seawater temperature is 23-32℃, then the circulating water flow rate is controlled to the rated circulating water flow rate, and the circulating water dosage is 1.3-1.65mg / L.

[0019] In this invention, the detected seawater temperature is 23-32℃, for example, it can be 23℃, 23.5℃, 24℃, 24.5℃, 25℃, 25.5℃, 26℃, 26.5℃, 27℃, 27.5℃, 28℃, 28.5℃, 29℃, 29.5℃, 30℃, 30.5℃, 31℃, 31.5℃ or 32℃, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0020] In this invention, the dosage of the circulating water is 1.3-1.65 mg / L, for example, it can be 1.3 mg / L, 1.32 mg / L, 1.34 mg / L, 1.36 mg / L, 1.38 mg / L, 1.4 mg / L, 1.42 mg / L, 1.44 mg / L, 1.46 mg / L, 1.48 mg / L, 1.5 mg / L, 1.52 mg / L, 1.54 mg / L, 1.56 mg / L, 1.58 mg / L, 1.6 mg / L, 1.62 mg / L, 1.64 mg / L, or 1.65 mg / L, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0021] As a preferred technical solution of the present invention, the effective chlorine ratio is (circulating water dosage C × circulating water flow rate Q × electrolyzer rated flow rate Q0) / (electrolyzer rated effective chlorine M × electrolyzer operating flow rate D × number of electrolyzer operating columns n × 1000).

[0022] In this invention, the number of electrolytic cells operating in the effective chlorine ratio, n, can be selected based on the temperature of the cooling seawater. When the detected seawater temperature is 9-17.4°C, the number of electrolytic cells operating is 2; when the detected seawater temperature is 17.5-22°C, the number of electrolytic cells operating is 3; when the detected seawater temperature is 23-32°C, the number of electrolytic cells operating is 3 or 4, which can be selected according to actual needs.

[0023] As a preferred technical solution of the present invention, the method of determining the operating current of the electrolyzer based on the effective chlorine ratio is to calculate the operating current by calculating the effective chlorine ratio, specifically, the operating current = effective chlorine ratio × a × rated current of the electrolyzer, wherein, when the effective chlorine ratio is ≥40%, a = 1, and when the effective chlorine ratio is <40%, a = 1.25-2.2.

[0024] As a preferred technical solution of the present invention, the preset residual chlorine value is 0.1-0.2 mg / L, for example, it can be 0.1 mg / L, 0.11 mg / L, 0.12 mg / L, 0.13 mg / L, 0.14 mg / L, 0.15 mg / L, 0.16 mg / L, 0.17 mg / L, 0.18 mg / L, 0.19 mg / L or 0.2 mg / L, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0025] As a preferred technical solution of the present invention, the range of the operating current of the electrolytic cell in the electrolytic chlorine production system is 500-510A, for example, it can be 500A, 500.5A, 501A, 501.5A, 502A, 502.5A, 503A, 503.5A, 504A, 504.5A, 505A, 505.5A, 506A, 506.5A, 507A, 507.5A, 508A, 508.5A, 509A, 509.5A or 510A, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0026] As a preferred technical solution of the present invention, the seawater electrolysis chlorine production system is used in conjunction with a seawater DC cooling circulating water system.

[0027] As a preferred technical solution of the present invention, the control method includes:

[0028] S1. Detect the temperature of the seawater used for cooling. If the seawater temperature is <9℃, the seawater electrolysis chlorine production system will stop operating; otherwise, obtain the flow rate of the circulating water used for cooling.

[0029] S2. Determine the dosage of circulating water based on the flow rate of cooling circulating water and the temperature of cooling seawater, calculate the effective chlorine ratio based on the dosage of circulating water, determine the operating current of the electrolyzer in the seawater electrolysis chlorination system based on the effective chlorine ratio, and detect the residual chlorine value of the circulating water siphon well. If the detected residual chlorine value meets the preset residual chlorine value, continue operation; otherwise, adjust the operating current of the electrolyzer in the electrolysis chlorination system until the residual chlorine value of the circulating water siphon well meets the preset residual chlorine value.

[0030] If the detected seawater temperature is 9-17.4℃, the circulating water flow rate is controlled at 2 / 3 of the rated circulating water flow rate, and the dosage of the chemical added is 0.25-1.06 mg / L; if the detected seawater temperature is 17.5-22℃, the circulating water flow rate is controlled at the rated circulating water flow rate, and the dosage of the chemical added is 1.1-1.15 mg / L; if the detected seawater temperature is 23-32℃, the circulating water flow rate is controlled at the rated circulating water flow rate, and the dosage of the chemical added is 1.3-1.65 mg / L; the effective chlorine ratio is (chemical added C × circulating water flow rate Q × electrolysis). The rated flow rate of the electrolytic cell is Q0) / (rated available chlorine M × operating flow rate D × number of operating columns n × 1000); the operating current of the electrolytic cell is determined based on the available chlorine ratio by calculating the operating current from the calculated available chlorine ratio, specifically: operating current = available chlorine ratio × a × rated operating current of the electrolytic cell, where a = 1 for an available chlorine ratio ≥ 40%, and a = 2.5-3 for an available chlorine ratio < 40%; the preset residual chlorine value is 0.1-0.2 mg / L; the range of adjusting the operating current of the electrolytic cell in the electrolytic chlorine production system is 500-510 A;

[0031] The seawater electrolysis chlorine production system is used in conjunction with a seawater direct current cooling circulating water system.

[0032] In this invention, the electrolytic chlorine production system includes multiple sets of electrolytic cells arranged in parallel and a sodium hypochlorite storage tank for collecting the electrolyzed products.

[0033] Compared with existing technical solutions, the present invention has the following beneficial effects:

[0034] (1) The original electrolytic seawater chlorination process operates with a wide control range based on a circulating water dosing concentration of 0.1-0.5 mg / L. However, when the circulating water dosing concentration is at its high limit, the dosing amount is large, resulting in high operating costs. This method controls the current of the electrolytic chlorination system by adjusting the seawater temperature and circulating water flow rate, controls the circulating dosing at its low limit, and precisely adjusts the number of electrolytic cells and the operating current, thereby reducing production costs by approximately RMB 1.5 million per year.

[0035] (2) The original electrolytic seawater chlorination process selects the operating current and number of electrolyzers according to the dosage of 0.1-0.5 mg / L of circulating water, which has a large control range. When the dosage of circulating water is at the high limit, the dosage is large and it is not environmentally friendly. This method controls the dosage of circulating water to the low limit, so there is no biological attachment in the circulating water system, the protection effect is good, and it is environmentally friendly.

[0036] (3) The original seawater electrolysis chlorine production process operates in winter, which has high operating costs. Based on the seawater temperature and the growth characteristics of marine organisms, the seawater temperature at which the seawater chlorine production is shut down in winter is determined to reduce operating costs, saving about RMB 800,000 per year, reducing environmental impact, and reducing the impact of excessively low seawater temperature on the coating of the anode mesh of the electrolytic cell. Detailed Implementation

[0037] To better illustrate the present invention and facilitate understanding of its technical solutions, typical but non-limiting embodiments of the present invention are as follows:

[0038] Example 1

[0039] This embodiment provides a control method for multi-mode operation of a seawater electrolysis chlorine production system, the control method including:

[0040] S1. Detect the temperature of the seawater used for cooling. If the seawater temperature is <9℃, the seawater electrolysis chlorine production system will stop operating; otherwise, obtain the flow rate of the circulating water used for cooling.

[0041] S2. Determine the dosage of circulating water based on the flow rate of cooling circulating water and the temperature of cooling seawater, calculate the effective chlorine ratio based on the dosage of circulating water, determine the operating current of the electrolyzer in the seawater electrolysis chlorination system based on the effective chlorine ratio, and detect the residual chlorine value of the circulating water siphon well. If the detected residual chlorine value meets the preset residual chlorine value, continue operation; otherwise, adjust the operating current of the electrolyzer in the electrolysis chlorination system until the residual chlorine value of the circulating water siphon well meets the preset residual chlorine value.

[0042] If the detected seawater temperature is 9-17.4℃, the circulating water flow rate is controlled at 2 / 3 of the rated circulating water flow rate, and the dosage of the chemical added is 0.25-1.06 mg / L; if the detected seawater temperature is 17.5-22℃, the circulating water flow rate is controlled at the rated circulating water flow rate, and the dosage of the chemical added is 1.1-1.15 mg / L; if the detected seawater temperature is 23-32℃, the circulating water flow rate is controlled at the rated circulating water flow rate, and the dosage of the chemical added is 1.3-1.65 mg / L; the effective chlorine ratio is (chemical added C × circulating water flow rate Q × electrolysis). The rated flow rate of the electrolytic cell is Q0) / (rated available chlorine M × operating flow rate D × number of operating columns n × 1000); the operating current of the electrolytic cell is determined based on the available chlorine ratio by calculating the operating current from the calculated available chlorine ratio, specifically: operating current = available chlorine ratio × a × rated operating current of the electrolytic cell, where a = 1 for an available chlorine ratio ≥ 40%, and a = 2.5-3 for an available chlorine ratio < 40%; the preset residual chlorine value is 0.1-0.2 mg / L; the range of adjusting the operating current of the electrolytic cell in the electrolytic chlorine production system is 500-510 A;

[0043] The seawater electrolysis chlorine production system is used in conjunction with a seawater direct current cooling circulating water system.

[0044] In this embodiment, different temperature ranges can be designed as specific operating conditions based on the seawater temperature range. During automatic control, the corresponding operating condition can be directly called. For example, setting seawater temperature < 9℃ as operating condition 1 means the electrolytic chlorination system is shut down; setting seawater temperature 9-17.4℃ as operating condition 2 means adjusting the circulating water flow rate, circulating water dosage, and electrolyzer operating current accordingly; setting seawater temperature 17.5-22℃ as operating condition 3 means adjusting the circulating water flow rate, circulating water dosage, and electrolyzer operating current accordingly; and setting seawater temperature 23-32℃ as operating condition 4 means adjusting the circulating water flow rate, circulating water dosage, and electrolyzer operating current accordingly.

[0045] Application Example 1

[0046] This application example provides a specific usage process of a control method for multi-mode operation of a seawater electrolysis chlorination system, as detailed below:

[0047] S1: During unit power operation, the electrolysis of seawater to produce chlorine operates in multiple modes, as follows:

[0048] Mode 1: The electrolysis of seawater to produce chlorine is shut down.

[0049] Mode 2: Based on the formula (circulating water dosage C × circulating water flow rate Q × electrolyzer rated flow rate Q0) / (electrolyzer rated effective chlorine M × electrolyzer operating flow rate D × number of electrolyzer operating rows n × 1000), determine the effective chlorine ratio and the electrolyzer operating current (operating current = effective chlorine ratio × a × rated current of electrolyzer operation, where a = 1 if the effective chlorine ratio ≥ 40%, and a = 2.5-3 if the effective chlorine ratio < 40%). The number of operating electrolyzers is 2 rows.

[0050] Mode 3: Based on the formula, the effective chlorine ratio is (circulating water dosage C × circulating water flow rate Q × electrolyzer rated flow rate Q0) / (electrolyzer rated effective chlorine M × electrolyzer operating flow rate D × number of electrolyzer operating columns n × 1000). Determine the effective chlorine ratio and the electrolyzer operating current (operating current = effective chlorine ratio × a × rated current of electrolyzer operation, where a = 1 if the effective chlorine ratio is ≥ 40%, and a = 2.5-3 if the effective chlorine ratio is < 40%). The number of operating electrolyzers is 3 columns.

[0051] Mode 4: Based on the formula, the effective chlorine ratio is (circulating water dosage C × circulating water flow rate Q × electrolyzer rated flow rate Q0) / (electrolyzer rated effective chlorine M × electrolyzer operating flow rate D × number of electrolyzer operating rows n × 1000). The effective chlorine ratio is determined, and the electrolyzer operating current is determined (operating current = effective chlorine ratio × a × rated current of electrolyzer operation, where a = 1 if the effective chlorine ratio is ≥ 40%, and a = 2.5-3 if the effective chlorine ratio is < 40%). The number of electrolyzers can be 3 or 4 rows.

[0052] S2: Step 2.1 Unit power operation, circulating water flow rate is 2 / 3 of the rated flow rate, seawater temperature is <9℃, and the operation mode is mode 1.

[0053] Step 2.2 Unit power operation, circulating water flow rate is 2 / 3 of the rated flow rate, seawater temperature is 9-17.4℃, circulating water chemical dosage is 0.25-1.06mg / L, and the operation mode is mode 2.

[0054] Step 2.3 Unit power operation, circulating water flow rate is rated flow rate, seawater temperature is 17.5-22℃, circulating water chemical dosage is 1.1-1.15mg / L, circulating water is operated at full flow rate, and the operation mode is mode 3.

[0055] Step 2.4 Unit power operation, circulating water flow rate is rated flow rate, seawater temperature is 23-32℃, circulating water chemical dosage is 1.3-1.65mg / L, and the operation mode is mode 4.

[0056] Step 3: Select the operating mode according to the temperature and flow rate of the circulating water seawater, and put the electrolyzer into operation according to the mode. Measure the residual chlorine in the circulating water siphon well to be between 0.1-0.2 mg / L. If it exceeds the range, appropriately increase or decrease the electrolyzer current, with 500A as the adjustment range for the electrolyzer current.

[0057] Step 4: After adjusting the current, remeasure the residual chlorine in the circulating water siphon well to ensure it is between 0.1-0.2 mg / L.

[0058] Step 5: Monitor the seawater temperature online daily and adjust the electrolyzer current and the number of operating cells according to the seawater temperature.

[0059] During operation, the specific operating parameters for modes 2, 3, and 4 are shown in Table 1 below:

[0060]

[0061]

[0062] In the table, Q represents the rated flow rate of the circulating water, and I... 额定 The rated flow rate of the electrolytic cell in the electrolytic chlorine production system.

[0063] In this scheme, the dosage of seawater is controlled in four modes based on seawater temperature and the influence of seawater temperature and organic matter on the decay of effective chlorine. The residual chlorine content in the circulating water siphon well is monitored, and the operating current and number of electrolyzers are precisely controlled, which greatly reduces the electricity cost of producing chlorine from seawater and extends the service life of the electrolyzers.

[0064] The present invention is described in detail through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the components used in the present invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0065] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0067] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A control method for multi-mode operation of a seawater electrolysis chlorine production system, characterized in that, The control method includes: S1. Detect the temperature of the seawater used for cooling. If the seawater temperature is <9℃, the seawater electrolysis chlorine production system will stop operating; otherwise, obtain the flow rate of the circulating water used for cooling. S2. Determine the dosage of circulating water based on the flow rate of cooling circulating water and the temperature of cooling seawater, calculate the effective chlorine ratio based on the dosage of circulating water, determine the operating current of the electrolyzer in the seawater electrolysis chlorination system based on the effective chlorine ratio, and detect the residual chlorine value of the circulating water siphon well. If the detected residual chlorine value meets the preset residual chlorine value, continue operation; otherwise, adjust the operating current of the electrolyzer in the electrolysis chlorination system until the residual chlorine value of the circulating water siphon well meets the preset residual chlorine value. When the temperature of the seawater used for cooling is 9-17.4℃, the circulating water flow rate is controlled at 2 / 3 of the rated circulating water flow rate, the chemical dosage is 0.25-1.06 mg / L, and the number of electrolytic cells in operation is 2. When the temperature of the seawater used for cooling is 17.5-22℃, the circulating water flow rate is controlled at the rated circulating water flow rate, the chemical dosage is 1.1-1.15 mg / L, and the number of electrolytic cells in operation is 3. When the temperature of the seawater used for cooling is 23-32℃, the circulating water flow rate is controlled at the rated circulating water flow rate, and the chemical dosage is 1.3-1.65 mg / L. The number of operating columns of the electrolytic cells is 3 or 4; the effective chlorine ratio is (circulating water dosage C × circulating water flow rate Q × electrolytic cell rated flow rate Q0) / (electrolytic cell rated effective chlorine M × electrolytic cell operating flow rate D × number of operating columns n × 1000); the operating current = effective chlorine ratio × a × rated operating current of the electrolytic cell, wherein, if the effective chlorine ratio is ≥40%, a = 1, and if the effective chlorine ratio is <40%, a = 2.5-3; the preset residual chlorine value is 0.1-0.2 mg / L; the range of adjusting the operating current of the electrolytic cells in the electrolytic chlorination system is 500-510 A; The seawater electrolysis chlorine production system is used in conjunction with a seawater direct current cooling circulating water system.

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