Method and system for adjusting the quality of waste water detected in a low-pressure marine boiler

Abstract

This application pertains to the field of marine water treatment, specifically disclosing a method and system for adjusting the water quality of wastewater from a marine low-pressure boiler, comprising the following steps: S1: Monitoring the pH value of the wastewater. 废水 And phosphate value, calculate pH 无游离氢氧根 pH 除游离氢氧根后 S2: Determine the wastewater treatment mode, when 7 ≤ wastewater pH ≤ pH 无游离氢氧根 When the wastewater is discharged, S5 is initiated; when pH 1 ≤ wastewater pH < 7, S3 and S5 are completed respectively; when pH 无游离氢氧根 When the wastewater pH is ≤11, complete S4 and S5 respectively; S3: Inject sodium carbonate solution into the wastewater to be treated until 7 ≤ wastewater pH ≤ pH 无游离氢氧根 S4: Drain the wastewater; S5: Inject disodium hydrogen phosphate solution into the wastewater to be treated until the pH reaches the specified level. 无游离氢氧根 ≤ Wastewater pH ≤ pH 除游离氢氧根后 S5: High-temperature, high-purity water purification treatment. This application effectively controls the content of corrosive media in wastewater, solving the problem of rust, pitting, and perforation of discharge pipes and pipe fittings caused by direct discharge of marine testing wastewater.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of marine water treatment, and more particularly, to a method and system for adjusting the quality of detection wastewater of a marine low-pressure boiler. BACKGROUND

[0002] The detection wastewater of a marine low-pressure boiler refers to the wastewater generated when detecting boiler water, feed water and make-up water on a ship using a low-pressure boiler steam power system. A large amount of corrosion medium exists in such detection wastewater, mainly including free hydrogen ions or free hydroxyl ions, chloride ions, sulfate ions, etc. At present, most of such detection wastewater is treated by the method of pipeline dilution into the sea.

[0003] In related technologies, some ships use acid and alkali substances to treat detection wastewater, but some ship systems strictly prohibit the use of acid and alkali due to their use characteristics, so that the existing detection wastewater treatment method cannot be directly applied to such ships. For the ships that use the method of pipeline dilution into the sea to treat detection wastewater, after long-term operation, the detection wastewater conveying pipeline and pipeline auxiliary equipment will appear rusting and pitting perforation phenomenon, thereby causing detection wastewater leakage, which seriously affects the safe operation of the ship system. Therefore, there is an urgent need for a method and system for adjusting the quality of detection wastewater of a marine low-pressure boiler to solve the problem of rusting and pitting perforation of the detection wastewater conveying pipeline and pipeline auxiliary equipment of the ship. SUMMARY

[0004] In view of the defects of the prior art, the present application provides a method and system for adjusting the quality of detection wastewater of a marine low-pressure boiler, which aims to solve the problem that on some ships that prohibit the use of acid and alkali, long-term use of the method of pipeline dilution into the sea to treat detection wastewater causes the detection wastewater conveying pipeline and pipeline auxiliary equipment to appear rusting and pitting perforation phenomenon, thereby causing detection wastewater leakage, which seriously affects the safe operation of the ship system.

[0005] The method for adjusting the quality of detection wastewater of a marine low-pressure boiler provided by the present application specifically includes the following steps:

[0006] S1: Collecting detection wastewater to be treated to a specified volume V 废水 , monitoring the pH value pH 废水 and phosphate value of the wastewater, and calculating the current wastewater pH 无游离氢氧根 and pH 除游离氢氧根后 ;

[0007] S2: Determining the wastewater treatment mode according to pH 废水 and pH 无游离氢氧根 :

[0008] When 7≤pH 废水 ≤pH 无游离氢氧根 , empty the detection wastewater and go to step S5;

[0009] When 1≤pH 废水 <7, after step S3, the detection wastewater is emptied and step S5 is entered;

[0010] When pH 无游离氢氧根 <pH 废水 ≤11, after step S4, the detection wastewater is emptied and step S5 is entered;

[0011] When pH 废水 <1 or pH 废水 >11, the detection wastewater is stored for land neutralization treatment;

[0012] S3: Sodium carbonate solution is injected into the detection wastewater to be treated to adjust the hydrogen ion content in the detection wastewater until the detection wastewater reaches 7≤pH 废水 ≤pH 无游离氢氧根 , and the injection of sodium carbonate solution is stopped;

[0013] S4: Disodium hydrogen phosphate solution is injected into the detection wastewater to be treated to adjust the hydroxyl ion content in the detection wastewater until the detection wastewater reaches pH 无游离氢氧根 ≤pH 废水 ≤pH 除游离氢氧根后 , and the injection of disodium hydrogen phosphate solution is stopped;

[0014] S5: High-temperature high-purity water is used for purification treatment to complete the detection wastewater treatment.

[0015] As a further preferred, in step S1, a pH 废水 monitoring module is used to obtain pH 3- , a phosphate ion monitoring module is used to obtain the total PO4 0，总磷酸根 value C 无游离氢氧根 of the detection wastewater, and the following formula is used to calculate the wastewater pH

[0016]

[0017] wherein, Kw is the ion product of water; Ka3 is the third ionization constant of phosphoric acid; is the molar mass of phosphate; b is a constant, and the value is 14±0.2; the function is a composite function about K W , K a3 , C 0，总磷酸根 , which increases with the increase of K W , decreases with the decrease of K 0，总磷酸根 , and decreases with the increase of C a3 , increases with the decrease of C

[0018] As further preferred, in the step S3, the injection flow rate Q of the sodium carbonate solution at time t is calculated by the following formula:

[0019]

[0020] wherein pH 控制 is the pH value detected at the time of wastewater discharge, pH t is the pH value detected at time t, δ1 is the concentration of sodium carbonate, is the molar mass of sodium carbonate, V 废水 is the effective volume of the detected wastewater; the function is a composite function with respect to pH 控制 , increases with the increase of pH 控制 , V 废水 and decreases with the decrease of pH 控制 , V 废水 , and the function is an inverse proportional function with respect to δ1, t, which decreases with the increase of δ1, t and increases with the decrease of δ1, t;

[0021] the function is a linear function with respect to pH 控制 , pH t , which increases with the increase of pH 控制 and decreases with the decrease of pH 控制 , and which decreases with the increase of pH t and increases with the decrease of pH t .

[0022] As further preferred, in the step S4, the injection flow rate Q of the disodium hydrogen phosphate solution at time t is calculated by the following formula: t

[0023]

[0024] wherein C 0，总Na is the initial total sodium content of the detected wastewater, C 0，总磷酸根 is the initial total phosphate content of the wastewater, MNa is the molar mass of sodium, is the molar mass of phosphate, is the molar mass of disodium hydrogen phosphate, δ2 is the concentration of disodium hydrogen phosphate, V 废水 is the effective volume of the detected wastewater; the function is a composite function with respect to C 0，总Na , C 0，总磷酸根 , MNa , δ2, V 废水 , t, which increases with the increase of C 0，总Na , C 0，总磷酸根 , V 废水 and decreases with the decrease of C 0，总Na , C 0，总磷酸根 , V 废水 , and which decreases with the increase of δ2, t and increases with the decrease of δ2, t.

[0025] As a further preferred, in the step S1, the following formula is used to calculate the current wastewater pH after the removal of free hydroxyl ions in the wastewater 除游离氢氧根后 :

[0026]

[0027] wherein C 0，总Na is the initial total sodium content of the wastewater under test, C 0，总磷酸根 is the initial total phosphate content of the wastewater under test, K w is the ion product of water, K a3 is the third ionization constant of phosphoric acid, and b is a constant with a value of 14±0.2; the function is a composite function of C 0，总Na , C 0，总磷酸根 , K W , K a3 , which increases with the increase of C 0，总Na , K W , and decreases with the decrease of C 0，总磷酸根 , K a3 .

[0028] The application provides a ship low-pressure boiler wastewater quality adjusting system, which is used for executing the adjusting method and comprises a wastewater tank for collecting and discharging wastewater under test.

[0029] A parameter monitoring module is used for monitoring the pH value pH 废水 and the phosphate value of the wastewater, and calculating the wastewater pH 无游离氢氧根 and pH 除游离氢氧根后 .

[0030] A wastewater under test processing module is used for starting the parameter monitoring module when the wastewater in the wastewater tank is collected to a specified volume.

[0031] A free hydrogen ion processing module is used for injecting sodium carbonate solution into the wastewater under test to adjust the water quality when the parameter monitoring module monitors 1≤pH 废水 <7.

[0032] A free hydroxyl ion processing module is used for injecting disodium hydrogen phosphate solution into the wastewater under test to adjust the water quality when the parameter monitoring module monitors pH 无游离氢氧根 < pH 废水 ≤11.

[0033] A high-temperature high-purity water purification module is used for purifying the wastewater tank after the wastewater under test is discharged.

[0034] A waste gas discharge module is used to discharge the gas generated after the start of the free hydrogen ion treatment module, and the outlet of the waste gas discharge module is connected to the outside of the detection wastewater tank.

[0035] As a further preferred, the free hydrogen ion treatment module comprises a sodium carbonate automatic dispensing module and a sodium carbonate injection module;

[0036] The sodium carbonate automatic dispensing module comprises a first preparation tank and:

[0037] A first high-purity water injection module is used to inject high-purity water into the first preparation tank;

[0038] A first medicament adding module is used to inject sodium carbonate into the first preparation tank;

[0039] A first heating module is used to heat the solution in the first preparation tank;

[0040] A first stirring module is used to stir the solution in the first preparation tank;

[0041] The sodium carbonate injection module comprises:

[0042] A first dosing module is used to inject the sodium carbonate solution prepared by the sodium carbonate automatic dispensing module into the detection wastewater;

[0043] A first flow regulating module is used to regulate the flow of the sodium carbonate solution injected by the first dosing module.

[0044] As a further preferred, the free hydrogen ion treatment module comprises a sodium carbonate automatic dispensing module and a sodium carbonate injection module;

[0045] The sodium carbonate automatic dispensing module comprises a first preparation tank and:

[0046] A first high-purity water injection module is used to inject high-purity water into the first preparation tank;

[0047] A first medicament adding module is used to inject sodium carbonate into the first preparation tank;

[0048] A first heating module is used to heat the solution in the first preparation tank;

[0049] A first stirring module is used to stir the solution in the first preparation tank;

[0050] The sodium carbonate injection module comprises:

[0051] A first dosing module is used to inject the sodium carbonate solution prepared by the sodium carbonate automatic dispensing module into the detection wastewater;

[0052] A first flow regulating module is used to regulate the flow of the sodium carbonate solution injected by the first dosing module.

[0053] As a further preferred, the high-temperature high-purity water purification module is connected in communication with the inside of the detection wastewater tank, so as to realize high-temperature high-purity water purification treatment after discharging the detection wastewater.

[0054] Overall, compared with the prior art, the above technical solutions conceived by the present application mainly have the following technical advantages:

[0055] 1. The present application provides a practical and feasible method for ship detection wastewater treatment without using acid and alkali, to solve the problem that the detection wastewater discharged through the pipeline will cause the pipeline and the pipeline auxiliary equipment to rust and pitting perforation;

[0056] 2. The present application provides a method for treating free hydrogen ions and free hydroxyl ions in marine detection wastewater, and provides a method for calculating the pH of free hydroxyl ion-free wastewater and the pH of wastewater after removing free hydroxyl ions, which provides technical support for precise control of free hydrogen ions and free hydroxyl ions in marine low-pressure boiler detection wastewater, effectively controls the total number and content of ions in wastewater, and thus can effectively remove corrosive substances in detection wastewater;

[0057] 3. The present application provides a method for regulating deacidification agent sodium carbonate and dealkalization agent sodium dihydrogen phosphate, precisely controls the amount of medicament added, effectively reduces the cost of medicament procurement, and effectively controls the total number and content of ions in wastewater, thereby providing technical support for marine low-pressure boiler detection wastewater treatment. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 is the detection wastewater quality regulation method flow chart provided by the present application;

[0059] Figure 2 is the overall structure schematic diagram of the detection wastewater quality regulation system provided by the present application. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the present application more clear and obvious, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0061] Wastewater from marine low-pressure boilers contains a large amount of corrosive media, mainly including free hydrogen ions or free hydroxide ions, chloride ions, and sulfate ions. Currently, it is typically treated by diluting it through ocean discharge via pipelines. The materials used in these marine discharge pipelines and their accessories are mostly stainless steel, and the Fe3O4 oxide film on the stainless steel surface is crucial for its corrosion resistance. Free hydrogen ions and free hydroxide ions in the wastewater can undergo electrochemical or chemical reactions with the Fe3O4 oxide film on the stainless steel surface, damaging the protective film and causing the stainless steel substrate to come into direct contact with oxygen in the wastewater. This results in the formation of red rust that adheres to the stainless steel substrate, leading to corrosion of the pipelines and their accessories. This type of red rust has poor density, allowing dissolved oxygen droplets to come into contact with the stainless steel substrate, forming oxygen-consuming corrosion cells. The presence of chloride and sulfate ions in the wastewater accelerates the rate of oxygen-consuming corrosion, causing continuous dissolution and loss of the stainless steel substrate, resulting in pitting and perforation of the pipelines and their accessories. Free hydrogen ions and free hydroxide ions are the main factors for detecting rust, pitting, and perforation in wastewater discharge pipes and accessories, and they need to be thoroughly removed. Other corrosive media are secondary factors for pipe corrosion, and their concentration on the pipes should be minimized.

[0062] This application discloses a method for adjusting the water quality of wastewater from a marine low-pressure boiler. (Refer to...) Figure 1 A method for adjusting the water quality of wastewater from a marine low-pressure boiler includes the following steps:

[0063] S1: Collect the wastewater to be treated into a specified volume V using a wastewater tank. 废水 The shipboard wastewater treatment module and parameter monitoring system were activated to monitor the pH and phosphate levels of the wastewater and establish a pH value. 无游离氢氧根 and pH 除游离氢氧根后 Mathematical function model to calculate the pH of current wastewater 无游离氢氧根 and pH 除游离氢氧根后 Specifically, a pH monitoring module is used to obtain the pH of the wastewater. This module is used for detecting the free hydrogen ion content in the wastewater, storing the detection data, and providing feedback. A phosphate ion monitoring module is used to obtain the total PO4 in the wastewater. 3- Value C 0，总磷酸根 PO4 3- The ion monitoring module is used for detecting total phosphate content in wastewater, storing and feeding back the detection data, and calculating the pH of wastewater without free hydroxide ions using the following formula. 无游离氢氧根 :

[0064]

[0065] Among them, K w The ion product of water; K a3 It is the third-order ionization constant of phosphate; is the molar mass of phosphate; b is a constant, taking a value of 14 ± 0.2; function is a composite function of K W , K a3 , C 0，总磷酸根 , which increases with the increase of K W , decreases with the decrease, decreases with the increase of C 0，总磷酸根 , K a3 , and increases with the decrease.

[0066] S2: Determine the wastewater treatment mode according to pH 废水 and pH 无游离氢氧根 : when 7≤ wastewater pH≤ pH 无游离氢氧根 , empty the detection wastewater, and go to step S5; when 1≤ wastewater PH<7, after treatment through step S3, empty the detection wastewater, and go to step S5; when pH 无游离氢氧根 <11, after treatment through step S4, empty the detection wastewater and go to step S5; when wastewater pH<1 or wastewater pH>11, store the detection wastewater for onshore neutralization treatment;

[0067] S3: Start the free hydrogen ion treatment module, inject sodium carbonate solution into the detection wastewater to be treated to adjust the hydrogen ion content in the detection wastewater, until the detection wastewater reaches 7≤ wastewater pH≤ pH 无游离氢氧根 , turn off the free hydrogen ion treatment module and stop injecting sodium carbonate solution; specifically, according to the pH value pH 控制 of the detection wastewater when it is discharged, the pH value pH t of the detection wastewater at time t, the concentration of sodium carbonate δ1, the molar mass of sodium carbonate , the effective volume V 废水 of the detection wastewater, and the adjustment time t, calculate the injection flow rate Q of sodium carbonate solution at time t and adjust it in real time; specifically, the injection flow rate Q of sodium carbonate solution at time t is calculated using the following formula:

[0068]

[0069] wherein, the function is a composite function of pH 控制 , , which increases with the increase of pH 控制 , V 废水 , and decreases with the decrease, and the function is an inverse proportional function of δ1 and t, which decreases with the increase of δ1 and t, and increases with the decrease;

[0070] the function is a linear function of pH 控制 , pH t , which increases with the increase of pH 控制 , decreases with the decrease, decreases with the increase of pH t , and increases with the decrease.

[0071] S4: Activate the free hydroxide ion treatment module and inject disodium hydrogen phosphate solution into the wastewater to be treated to adjust the hydroxide ion content in the wastewater until the wastewater reaches the required pH. 无游离氢氧根 ≤ Wastewater pH ≤ pH 除游离氢氧根后 Shut down the free hydroxide ion treatment module and stop injecting disodium hydrogen phosphate solution; specifically, use a sodium ion monitoring module to obtain and detect the total Na in the wastewater. + Value C 0，总Na Na + The monitoring module is used for detecting total sodium content in wastewater, storing and feeding back the detection data. Based on the wastewater pH, phosphate content, and total sodium, the current pH of the wastewater after removing free hydroxide ions is calculated using the following formula. 除游离氢氧根后 :

[0072]

[0073] Among them, K w The ion product of water; K a3 is the third-order ionization constant of phosphate; b is a constant with a value of 14 ± 0.2; function It's about C 0，总Na C 0，总磷酸根 K W K a3 The composite function, with C 0，总Na K W It increases with the increase of C, and decreases with the decrease of C. 0，总磷酸根 K a3 It increases and decreases, and decreases and increases;

[0074] Then, based on the initial total sodium content C of the wastewater... 0，总Na The initial total phosphate content (C) in the wastewater 0，总磷酸根 Sodium molar mass MNa phosphate molar mass Molar mass of disodium hydrogen phosphate Disodium hydrogen phosphate concentration δ2, effective volume of wastewater V 废水 And calculate the injection flow rate Q of disodium hydrogen phosphate over time t. t And adjust in real time. Specifically, the injection flow rate Q of disodium hydrogen phosphate solution at time t is calculated using the following formula. t :

[0075]

[0076] Among them, the function It's about C 0，总Na C 0，总磷酸根 M Na , δ2, V 废水The composite function of t, as C 0，总Na C 0，总磷酸根 V 废水 It increases with the increase of δ2 and t, and decreases with the decrease of δ2 and t;

[0077] S5: Start other corrosive media treatment modules, use high-temperature and high-purity water for purification treatment, and complete the treatment of test wastewater.

[0078] This application also discloses a wastewater quality adjustment system for marine low-pressure boilers. (See reference...) Figure 2 A wastewater quality adjustment system for marine low-pressure boiler testing is disclosed. This system, when in operation, executes the aforementioned adjustment method. It includes a wastewater tank for collecting and discharging the wastewater to be treated, a marine wastewater treatment module, a parameter monitoring module connected to the wastewater tank, a free hydrogen ion treatment module, a free hydroxide ion treatment module, a module for treating other corrosive media, and an exhaust gas emission module. The marine wastewater treatment module activates the parameter monitoring module after monitoring the wastewater in the tank to ensure it reaches a specified volume. A discharge pipe connected to the wastewater tank and equipped with a solenoid valve are connected to the tank. The parameter monitoring module activates the parameter monitoring module when the wastewater in the tank reaches a certain volume. The parameter monitoring module monitors the pH value of the wastewater. 废水 And phosphate value, and calculate wastewater pH. 无游离氢氧根 and pH 除游离氢氧根后 This includes a pH monitoring module for acquiring wastewater pH and feeding it back to the free hydrogen ion treatment module, the free hydroxide ion treatment module, and other corrosive media treatment modules; and a module for acquiring and detecting the initial total sodium content (C) of the wastewater. 0，总Na The sodium ion monitoring module, which feeds back the data to the free hydroxide ion treatment module, and the module used to obtain and detect the total PO4 in the wastewater, are also connected to the module. 3- Value C 0，总磷酸根 The feedback is then sent to the system and the phosphate ion monitoring module of the free hydrogen ion treatment module and the free hydroxide ion treatment module. The free hydrogen ion treatment module removes free hydrogen ions from the detected wastewater based on the feedback value. Specifically, when the parameter detection module detects a pH value of 1 ≤ pH... 废水 When the pH value is <7, sodium carbonate solution is injected into the wastewater to be treated to adjust the water quality; the free hydroxide ion treatment module removes free hydroxide ions from the wastewater according to the feedback value. Specifically, when the parameter detection module detects the pH value... 无游离氢氧根 <pH 废水When ≤11, a sodium phosphate dibasic solution is injected into the detection wastewater to be treated to adjust the water quality; the other corrosion medium treatment modules are used to purify the detection wastewater tank and the discharge pipeline after the detection wastewater is discharged; the exhaust gas discharge module is used to discharge the gas generated after the hydrogen ion treatment module is started, and the outlet of the exhaust gas discharge module is connected with the exhaust port outside the detection wastewater tank. The diameter of the exhaust port is D±2mm.

[0079] The hydrogen ion treatment module includes a sodium carbonate automatic dispensing module and a sodium carbonate injection module; the sodium carbonate automatic dispensing module includes a first preparation tank, a first high-purity water injection module, a first reagent adding module, a first heating module for solution heating, and a first stirring module for solution stirring. The sodium carbonate solution is prepared in the first preparation tank, the first high-purity water injection module mainly completes high-purity water injection, and the conductivity of the injected high-purity water is ≤ρ, ρ≤1μs / cm; the first reagent adding module mainly completes the injection of the deacidification agent sodium carbonate, wherein the purity of the sodium carbonate is ≥η1, η1≥99%, the concentration of the sodium carbonate after dispensing is δ1: 20%≤δ1≤25%, the temperature rising gradient of the first heating module is ≤1℃, the set temperature T1 is 40℃≤T1≤41℃, and the heating and stirring time of the sodium carbonate dispensing module after reaching the equipment temperature is ≥h1, h1≥1h; the sodium carbonate injection module includes a first reagent adding module for injecting the sodium carbonate solution prepared by the sodium carbonate automatic dispensing module into the detection wastewater and a first flow regulating module for regulating the flow of the sodium carbonate solution injected by the first reagent adding module. The first flow regulating module calculates the injection flow Q at time t in real time by feedback values pH t , wastewater pH 控制 , sodium carbonate concentration δ1, sodium carbonate molar mass M Na2CO3 , effective volume of detection wastewater V 废水 , and adjustment time t, and adjusts the reagent adding flow of the first reagent adding module.

[0080] The free hydroxide ion treatment module includes an automatic disodium hydrogen phosphate dosing module and a disodium hydrogen phosphate injection module. The automatic disodium hydrogen phosphate dosing module includes a second preparation tank, a second high-purity water injection module, a second reagent addition module, a second heating module for solution heating, and a second stirring module for solution stirring. The second preparation tank prepares the disodium hydrogen phosphate solution. The second high-purity water injection module mainly injects high-purity water with a conductivity ≤ρ. The second reagent addition module mainly injects the dealkalizing agent, disodium hydrogen phosphate, with a purity ≥η2, where η2 ≥ 9. 0%, after dosing, the concentration of disodium hydrogen phosphate δ2: 20% ≤ δ2 ≤ 25%; the temperature rise gradient of the second heating module is ≤ 1℃, the set temperature T1, after the sodium carbonate dosing module reaches the equipment temperature, the heating and stirring time is ≥ h1; the disodium hydrogen phosphate injection module includes a second dosing module for injecting the disodium hydrogen phosphate solution prepared by the automatic disodium hydrogen phosphate dosing module into the test wastewater; and a second flow regulation module for adjusting the flow rate of the disodium hydrogen phosphate solution injected by the second dosing module. The second flow regulation module uses the initial feedback value C from the sodium ion monitoring module and the phosphate ion monitoring module. 0，总Ma C 0，总磷酸根 And combined with sodium molar mass MNa phosphate molar mass Molar mass of disodium hydrogen phosphate Disodium hydrogen phosphate concentration δ2, effective volume of wastewater V 废水 Given time t, calculate the injected flow Q. t And adjust the dosing flow rate of the second dosing module.

[0081] In this embodiment, other corrosive media treatment modules include a high-temperature, high-purity water purification module. The high-temperature, high-purity water purification module is connected to the inside of the test wastewater tank to achieve the following: after the test wastewater tank is emptied, the test wastewater is purified by a high-temperature, high-purity water purification system. Specifically, the system includes a purified test wastewater tank, a discharge pipe, and pipe accessories. The inlet water of the high-temperature, high-purity water purification module is the system condensate. The inlet water temperature T3 is 50℃≤T3≤60℃, the inlet water conductivity is ≤ρ, and the purification time of the high-temperature, high-purity water purification module is ≥h2, where h2≥5min.

[0082] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0083] It should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0084] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0085] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] Those skilled in the art can understand that the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting the quality of waste water from a low-pressure boiler of a ship, characterized in that, It comprises the following steps: S1: Collecting the wastewater to be treated to a specified volume V 废水 , monitoring the pH value pH 废水 and phosphate value of the wastewater, and calculating the current wastewater pH and pH 除游离氢氧根后 ; S2: According to pH 废水 and pH Determination of wastewater treatment mode: When 7 < pH 废水 ≤ pH , the detection of emptying wastewater, turn to step S5; When 1 < pH 废水 When 7 < pH < 10, the detection wastewater is drained after step S3, and the process goes to step S5. When pH <pH 废水 When the value is ≤11, after processing in step S4, the test wastewater is discharged and the process proceeds to step S5. When pH 废水 <1 or pH 废水 >11, the storage detection wastewater is subjected to onshore neutralization treatment; S3: injecting sodium carbonate solution into the detection wastewater to be treated to adjust the content of hydrogen ions in the detection wastewater until the detection wastewater reaches 7≤pH 废水 ≤pH , stopping the injection of sodium carbonate solution; S4: injecting a sodium hydrogen phosphate solution into the detection wastewater to be treated to adjust the content of hydroxyl ions in the detection wastewater until the detection wastewater reaches pH ≤pH 废水 ≤pH 除游离氢氧根后 , stopping the injection of the sodium hydrogen phosphate solution; S5: high-temperature high-purity water is used for purification treatment, and the detection wastewater treatment is completed; In the step S1, the pH monitoring module is used to obtain the pH 废水 The phosphate ion monitoring module is used to obtain the total PO4 3- value C 0，总磷酸根 of the wastewater , and the wastewater pH is calculated by the following formula: pH = wherein is the ion product of water; is the third ionization constant of phosphoric acid; is the molar mass of phosphate; b is a constant having a value of 14 ± 0.2; the function is a composite function of K W , K a3 , C 0，总磷酸根 , which increases with increasing K W , decreases with decreasing K 0，总磷酸根 , decreases with increasing C a3 , increases with decreasing C In the step S1, the following formula is used to calculate the current wastewater pH after removal of free hydroxyl ions from the wastewater 除游离氢氧根后 : pH 除游离氢氧根后 = wherein C 0，总Na is the initial total sodium content of the wastewater, 0，总磷酸根 is the initial total phosphate content of the wastewater, is the ion product of water, is the third ionization constant of phosphoric acid, b is a constant and has a value of 14 ± 0.2; the function is a composite function of C 0，总Na , C 0，总磷酸根 , K W , K a3 , increases with increasing C 0，总Na , K W and decreases with decreasing C 0，总磷酸根 , K a3 .

2. A method of detecting the quality of waste water from a low-pressure boiler of a ship according to claim 1, characterized in that, In step S3, the injection flow rate Q of the sodium carbonate solution at time t is calculated by the following formula: Q= Among them, pH 控制 To detect the pH value of wastewater during discharge, pH t To detect the pH value of wastewater at time t, δ1 represents the sodium carbonate concentration. The molar mass of sodium carbonate is To detect the effective volume of wastewater; function It's about pH 控制 , The composite function, with pH 控制 , The function increases with the increase of the value and decreases with the decrease of the value. It is an inverse proportional function of δ1 and t, which decreases as δ1 and t increase, and increases as δ1 and t decrease; Function is a linear function of pH 控制 , increases as pH t increases, decreases as pH 控制 increases, decreases as pH t increases.

3. A method of detecting the quality of waste water from a low-pressure boiler of a ship according to claim 1, characterized in that, In the step S4, the injection flow rate Q of the sodium phosphate dibasic solution at the time t is calculated using the following equation t : Q t = wherein C 0，总Na is the initial total sodium content of the wastewater to be treated, 0，总磷酸根 is the initial total phosphate content of the wastewater to be treated, is the molar mass of sodium, is the molar mass of phosphate, is the molar mass of disodium hydrogen phosphate, and δ2is the concentration of disodium hydrogen phosphate, is the effective volume of the wastewater to be treated; the function is a composite function of C 0，总Na , C 0，总磷酸根 , , , , δ2, , t, which increases with increasing C 0，总Na , C 0，总磷酸根 , and decreases with decreasing C 0，总Na , C 0，总磷酸根 , and increases with increasing δ2, t and decreases with decreasing δ2, t.

4. A system for monitoring and adjusting the quality of waste water from a low pressure marine boiler, using the method according to any one of claims 1-3, c h a r a c t e r i s e d i n that It comprises: A detection wastewater tank is used for collecting and discharging the detection wastewater to be treated. A parameter monitoring module is configured to monitor pH value pH of the wastewater 废水 and phosphate value, and calculate pH and pH of the wastewater 除游离氢氧根后 ; A marine detection wastewater treatment module is used for monitoring the detection wastewater tank and starting the parameter monitoring module when the wastewater in the detection wastewater tank is collected to a specified volume. a free hydrogen ion treatment module for injecting sodium carbonate solution into the detection wastewater to be treated to adjust the water quality when the parameter detection module monitors that 1≤pH 废水 <7. a free hydroxyl ion treatment module for injecting a sodium phosphate dibasic solution into the detection wastewater to be treated to adjust the water quality when the parameter detection module monitors that the pH ≤ 11 废水 ≤ 11 A high-temperature high-purity water purification module is used for purifying the detection wastewater tank after the detection wastewater is discharged. A waste gas discharge module is used for discharging the gas generated after the start of the free hydrogen ion treatment module, and the outlet of the waste gas discharge module is connected to the outside of the detection wastewater tank.

5. A system for monitoring and adjusting the quality of the effluent water of a low pressure marine boiler as claimed in claim 4, c h a r a c t e r i s e d in that The free hydrogen ion treatment module comprises a sodium carbonate automatic dispensing module and a sodium carbonate injection module. The sodium carbonate automatic dispensing module comprises a first preparation tank and: A first high-purity water injection module is used for injecting high-purity water into the first preparation tank. A first medicament adding module is used for injecting sodium carbonate into the first preparation tank. A first heating module is used for heating the solution in the first preparation tank. A first stirring module is used for stirring the solution in the first preparation tank. The sodium carbonate injection module comprises: A first dosing module is used for injecting the sodium carbonate solution prepared by the sodium carbonate automatic dispensing module into the detection wastewater. A first flow rate adjusting module is used for adjusting the flow rate of the sodium carbonate solution injected by the first dosing module.

6. A marine low pressure boiler detection waste water quality regulating system as claimed in claim 4 wherein, The free hydrogen ion treatment module comprises a sodium carbonate automatic dispensing module and a sodium carbonate injection module. The sodium carbonate automatic dispensing module comprises a first preparation tank and: A first high-purity water injection module is used for injecting high-purity water into the first preparation tank. A first medicament adding module is used for injecting sodium carbonate into the first preparation tank. A first heating module is used for heating the solution in the first preparation tank. A first stirring module is used for stirring the solution in the first preparation tank. The sodium carbonate injection module comprises: A first dosing module is used for injecting the sodium carbonate solution prepared by the sodium carbonate automatic dispensing module into the detection wastewater. A first flow rate adjusting module is used for adjusting the flow rate of the sodium carbonate solution injected by the first dosing module.

7. A marine low pressure boiler detection waste water quality regulating system as claimed in claim 4 wherein, The high-temperature high-purity water purification module is connected to the inside of the detection wastewater tank to realize the purification treatment by high-temperature high-purity water after the detection wastewater is discharged.

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