Quenched water recycling method

Abstract

The invention relates to the technical field of quenching water, and discloses a quenching water recycling method which comprises the following steps: (1) collecting quenching water: conveying quenching water in a quenching pool of an incinerator to a storage tank through a conveying pump with the power of 2kW, and selecting 304 stainless steel or PE material as a conveying pipeline; (2) storage of quenched water: storing the quenched water in a storage tank, arranging a stirring device in the storage tank for preventing sodium carbonate from depositing, and arranging a temperature control device for controlling the liquid temperature to be 150.3 mol / L; and (5) conveying and adding quenched water: conveying the quenched water to a sewage treatment neutralization tank through a pipeline. The sodium carbonate component in the quenching water of the incinerator is used as the neutralizer for sewage treatment to replace traditionally used liquid caustic soda, compared with the liquid caustic soda, the quenching water is a byproduct in the incineration process, the chemical agent cost for sewage treatment is greatly reduced through reutilization, meanwhile, the additional purchase cost of the liquid caustic soda is avoided, and the economic benefit of the process is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of quenching water, and in particular to a quenching water recycling method. Background Art

[0002] With the development of industrialization, incinerators are widely used in the process of solid waste treatment. Their high-temperature incineration process has significant advantages in terms of volume reduction and harmless treatment. During the operation of the incinerator, the quenching pool is used to cool the high-temperature flue gas. Quenching water is widely present in industrial incineration facilities as a by-product. Quenching water usually contains a certain amount of sodium carbonate, suspended particles and a small amount of chloride. Since its alkaline components have good neutralization ability, it can theoretically be used as a wastewater treatment neutralizer for resource utilization.

[0003] At present, in industrial wastewater treatment, liquid alkali (NaOH) is commonly used as a neutralizing agent to adjust the pH value of wastewater to the discharge standard range. However, the purchase and use of liquid alkali not only increases the operating cost of wastewater treatment, but also brings safety hazards in the transportation and storage of chemical agents. On the other hand, quenching water is usually directly incinerated, which consumes additional energy and increases the processing burden and operating cost of the incinerator.

[0004] In the prior art, quench water is not fully utilized due to its complexity in treatment, while the widespread use of liquid alkali leads to high sewage treatment costs. This model not only wastes the alkaline components of quench water, but also brings additional economic and environmental pressures on incinerator treatment and chemical agent use. Therefore, how to realize the resource utilization of quench water to replace liquid alkali and reduce sewage treatment costs has become an important issue in the prior art. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for recycling quenching water, which solves the problem of quenching water not being recycled and the high sewage treatment cost and waste of resources caused by the use of liquid alkali.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for recycling quenching water, comprising the following steps:

[0007] (1) Collection of quenching water: The quenching water in the quenching pool of the incinerator is transported to the storage tank through a delivery pump. The delivery pump is 2kW and the delivery pipeline is made of 304 stainless steel or PE;

[0008] (2) Storage of quench water: The quench water is stored in a storage tank, wherein the storage tank is provided with a stirring device to prevent sodium carbonate deposition, and a temperature control device to control the liquid temperature at 150.3 mol / L;

[0009] (5) Transportation and addition of quench water: The quench water is transported to the sewage treatment neutralization tank through a pipeline, and the delivery pipeline is equipped with a flow meter and an electric valve for real-time monitoring and adjustment of the delivery flow of the quench water;

[0010] (6) Neutralization of sewage treatment: The pH value of the sewage is adjusted to 8.5-9.5 using quench water, and a stirring device is installed in the neutralization tank to promote mixing of quench water and sewage;

[0011] (7) Testing and feedback: The pH value, COD, ammonia nitrogen and suspended solids of the neutralized wastewater are tested, and the amount of quench water added is adjusted according to the test results.

[0012] Preferably, the stirring device of the storage tank is a stirring paddle driven by a motor, and the stirring speed is controlled at 50-150 rpm.

[0013] Preferably, the temperature control device of the storage tank is an electric heater or a cooling system, and the temperature control device controls the storage environment temperature within the range of 15 to 25°C.

[0014] Preferably, the detection of quench water comprises the following steps:

[0015] (1) Detecting the sodium carbonate concentration of quench water by acid-base titration;

[0016] (2) Determine the concentration of suspended particles in the quench water by gravimetric method;

[0017] (3) Measure the pH value of the quench water using a pH meter.

[0018] Preferably, the pretreatment of the quenching water includes filtering using a filter, and the pore size of the filter is 100 μm.

[0019] Preferably, an online flow meter is provided in the quench water delivery pipeline, and the monitoring accuracy of the flow meter is ±5%.

[0020] Preferably, a mechanical stirring device is installed in the sewage treatment neutralization tank, and the stirring speed of the stirring device is 30 to 80 rpm.

[0021] Preferably, the detection of the neutralized sewage includes:

[0022] (1) The pH value of the effluent is monitored in real time by an online pH monitor, with the target range being 8.0 to 8.6;

[0023] (2) Determination of chemical oxygen demand of effluent water by potassium dichromate method;

[0024] (3) The concentrations of ammonia nitrogen and total nitrogen in the water were detected by ultraviolet spectrophotometry.

[0025] Preferably, the detection and feedback are achieved through a data acquisition system, which records the amount of quench water added, the pH value, COD and ammonia nitrogen concentration of the effluent, and adjusts the quench water addition parameters through data analysis.

[0026] Preferably, the optimization of the feedback adjustment is based on historical data, using a machine learning algorithm to predict the demand for quenching water and automatically adjust the delivery and dosage.

[0027] The present invention provides a method for recycling quenching water. It has the following beneficial effects:

[0028] 1. The present invention uses the sodium carbonate component in the quenching water of the incinerator as a neutralizing agent for sewage treatment, replacing the traditional liquid alkali. Compared with liquid alkali, quenching water is a by-product of the incineration process. By reusing it, the cost of chemical agents for sewage treatment is greatly reduced, while the additional purchase cost of liquid alkali is avoided, greatly improving the economic benefits of the process.

[0029] 2. The present invention utilizes the quenching water as a resource and directly uses it in sewage treatment, thereby avoiding waste of resources and reducing the processing pressure of the incinerator, thereby achieving the environmental protection purpose of recycling.

[0030] 3. After scientific adjustment, the sodium carbonate concentration in the quenching water of the present invention can accurately meet the needs of sewage neutralization. Through dynamic transportation and intelligent dosing technology, the present invention realizes real-time optimization of the dosage, so that the pH value of the sewage is quickly stabilized in the target range (8.5-9.5), thereby ensuring the rapidity and uniformity of the neutralization reaction and significantly improving the sewage treatment efficiency.

[0031] 4. The present invention reduces the need for purchasing external chemical agents by using quenching water instead of liquid caustic soda, reduces potential safety hazards in transportation and storage, and reduces potential impacts on the environment from the source. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Please see attached Figure 1 The embodiment of the present invention provides a method for recycling quenching water, comprising the following steps:

[0035] For step S1 (collection of quenching water), it is first necessary to collect the quenching water in the quenching pool of the incinerator and use it as a resource-based raw material for the neutralization process of sewage treatment. Quenching water is a by-product of cooling flue gas in the incinerator, and usually contains a certain amount of sodium carbonate (Na2CO3), suspended particles, chlorides and other components. Since the sodium carbonate in the quenching water has good alkaline neutralization ability, it needs to be transported to a storage device through a scientific collection method to ensure the stability and efficiency of subsequent steps. In order to avoid leakage, impurity contamination and unstable transportation efficiency during transportation, this step is planned in detail from aspects such as equipment selection, pipeline design, and transportation process.

[0036] In this embodiment, for step S1 (collection of quench water), the specific technical implementation content is as follows:

[0037] Source of quenching waterQuick cooling water comes from the quenching pool of the incinerator. During the operation of the incinerator, the quenching pool is used to cool the flue gas. The water in the quenching pool is enriched with a certain amount of sodium carbonate (Na2CO3) due to contact with the flue gas, and may also contain a small amount of chloride and suspended particles. These components determine the neutralization capacity of the quenching water and need to be used reasonably in subsequent treatment.

[0038] Equipment selection

[0039] The core equipment for delivering quench water is a 2kW stainless steel delivery pump, which is made of 304 stainless steel to prevent corrosion.

[0040] The design flow range of the delivery pump is 50-200L / min, which can meet the continuous extraction demand of quench water in the quench pool while ensuring the delivery efficiency.

[0041] The delivery pump is installed next to the quenching tank, and a sealing device is provided at the connection between the pipeline and the pump to prevent liquid leakage.

[0042] Pipeline design

[0043] The material of the conveying pipeline is 304 stainless steel or PE (polyethylene) pipe. These two materials have excellent corrosion resistance and can convey quench water containing alkaline components and impurities for a long time without damage.

[0044] The diameter of the pipeline is designed to be 50mm to ensure small fluid resistance during transportation and to adapt to the flow range of the delivery pump.

[0045] The pipeline is sealed throughout the entire process, and sealing gaskets are added at key nodes such as elbows and interfaces to prevent leakage of quenching water due to loose joints.

[0046] The total length of the pipeline is designed to be 10 meters, which can be flexibly adjusted according to the distance between the incinerator and the storage tank.

[0047] Transport process requirements

[0048] During the transportation process, the quenching water must maintain continuous flow to avoid impurities being deposited in the pipeline due to stagnation.

[0049] A flow monitoring device is installed in the delivery pipeline to monitor the delivery flow of quench water in real time to ensure the operating stability of the delivery pump and provide delivery volume data support for subsequent storage links.

[0050] Sealed and leak-proof design

[0051] Chemical corrosion-resistant sealing gaskets and sealing rings are installed at the connection between the delivery pump and the pipeline, the pipeline interface and the fastener position.

[0052] When the conveying system is in operation, on-site operators shall regularly check the sealing status of the pipeline joints. If leakage is found, adjustments or replacement of seals shall be made in a timely manner.

[0053] Operation and safety requirements

[0054] The quench water delivery operation must be carried out in a closed environment, and the operators must wear protective equipment (such as anti-corrosion gloves, protective glasses, etc.) to prevent skin or eye irritation caused by contact with quench water.

[0055] The operating status of the conveying equipment and pipelines must be monitored by dedicated personnel to ensure timely handling when abnormalities occur (such as pump stoppage, abnormal flow or pressure fluctuations).

[0056] Preparation for inspection after delivery

[0057] After the quench water is delivered to the storage tank, the total amount delivered must be recorded and samples must be taken for testing to provide basic data for subsequent storage and processing steps.

[0058] S2. After completing the collection and transportation of quench water in step S1, the quench water needs to be temporarily stored in a storage tank to ensure the smooth progress of subsequent testing, pretreatment and dynamic transportation. The storage link needs to focus on solving the problems of sodium carbonate deposition in quench water, temperature control in the storage tank, and impurity accumulation. In addition, in order to ensure the stability of the quench water composition and the safety of the storage process, the storage tank must have a stirring device, anti-corrosion design, temperature control function and liquid level monitoring function. This step is planned in detail in terms of storage tank structure design, stirring and temperature control measures, and safety management.

[0059] In this embodiment, for step S2 (storage of quench water), the specific implementation content is as follows:

[0060] Specifications and structural design of storage tanks

[0061] Tank material: The tank body of the storage tank is made of 304 stainless steel or carbon steel lined with polytetrafluoroethylene coating to ensure corrosion resistance to quench water and avoid chemical reaction between the inner wall of the tank and sodium carbonate.

[0062] Capacity design: The storage tank is designed to have a capacity of 10 tons, which can meet the continuous storage needs of quench water discharged from the quench pool and reserve 30% of safety space.

[0063] Liquid level monitoring: A liquid level sensor is installed on the top of the storage tank to monitor the amount of quench water in the tank in real time. The liquid level alarm function is used to prevent overflow due to overfilling or low reserves from affecting the subsequent dosing process.

[0064] Installation and control of stirring device

[0065] Device type: A motor-driven stirring paddle is installed at the bottom of the tank. The stirring paddle is made of corrosion-resistant material (such as 316 stainless steel or coated with polytetrafluoroethylene) to ensure that the parts in contact with the quench water have a long service life.

[0066] Stirring speed control: The stirring speed is adjustable within the control range of 50-150rpm to avoid liquid turbulence caused by too fast stirring, while ensuring uniform mixing of the quench water in the tank to prevent sodium carbonate from depositing at the bottom of the tank.

[0067] Stirring operation strategy: The stirring device operates in intermittent mode, stirring for 15 minutes every hour to avoid energy waste caused by long-term operation while ensuring the uniformity of the liquid state.

[0068] Design and operation of temperature control system

[0069] Temperature control target: The storage temperature of quench water needs to be controlled at 15-25°C to prevent the temperature from being too low, causing sodium carbonate crystallization or scaling inside the storage tank.

[0070] Heating and cooling device: An electric heater and cooling system are installed on the outside of the tank. The electric heater is mainly used to prevent the internal temperature of the tank from being too low in a cold environment, and the cooling system controls the high temperature in the tank by circulating cooling water.

[0071] Temperature monitoring equipment: The storage tank is equipped with a real-time temperature monitoring device. The temperature control data is uploaded to the control center through sensors. The operator can adjust the heating or cooling time according to temperature fluctuations.

[0072] Tank sealing and anti-seepage design

[0073] Sealing device: The storage tank is equipped with a sealed cover. There is a vent hole on the top of the cover and a filter device is installed to prevent the volatile substances in the tank from leaking out and to prevent external pollutants from entering the tank.

[0074] Anti-leakage measures: The welding process of the tank bottom adopts an anti-leakage structure design, and an anti-leakage isolation area is set up to control the impact range of accidental leakage. An anti-corrosion lining is laid around the tank to prevent the leaked liquid from directly polluting the environment.

[0075] Stored Process Management

[0076] Storage data recording: Each time the quench water is delivered to the storage tank, key data such as the delivery volume, storage time and temperature inside the tank are recorded and uploaded to the central control system.

[0077] Regular discharge of impurities: The settled suspended particles are discharged every 8 hours through the sedimentation valve at the bottom of the storage tank to ensure the cleanliness of the inside of the tank and avoid the impact of impurity accumulation on subsequent treatment.

[0078] Safety inspection: Regularly check the tank welding points, the operating status of the stirring device and the temperature control system function, and deal with any problems in a timely manner.

[0079] S3. For step S3 (detection of quench water), after the storage of quench water is completed, it is necessary to detect its composition to ensure that the key chemical parameters of the quench water (such as sodium carbonate concentration, pH value and impurity content) meet the technical requirements of subsequent sewage treatment and neutralization. The detection link is an important control point of the entire process. The main purpose is to accurately analyze the chemical composition of quench water through scientific detection methods to provide data support for subsequent pretreatment and dynamic transportation. At the same time, through detection, impurity deposition or concentration changes that may occur during storage can be corrected in time to ensure the stability and use efficiency of quench water.

[0080] In this embodiment, for step S3 (detection of quenching water), the specific technical implementation content is as follows:

[0081] Test items

[0082] Sodium carbonate concentration: The main alkaline component in the quench water is sodium carbonate, and its concentration directly determines the neutralization capacity. This embodiment uses acid-base titration to determine the concentration of sodium carbonate. The specific steps include:

[0083] Sampling: Take 100mL of quench water sample from the top of the storage tank;

[0084] Titration: Use standard hydrochloric acid solution (concentration 0.1 mol / L) for titration, and determine the titration endpoint by an acid-base indicator (such as methyl orange);

[0085] Calculation: Calculate the concentration of sodium carbonate based on the volume of hydrochloric acid used for titration, with a target range of 0.1 to 0.3 mol / L.

[0086] pH value: The pH value of the quench water is measured by an online pH meter, with a target range of 8.0 to 9.0.

[0087] Impurity content: Detection of suspended particles and chloride concentration in quench water:

[0088] Suspended particles: Use the gravimetric method to filter a certain volume (e.g. 500 mL) of quenched water sample, and then determine the mass of particles by drying and weighing. The target concentration is ≤20 mg / L.

[0089] Chloride: Chloride concentration was determined by ion chromatography with a target range of ≤100 mg / L.

[0090] Testing equipment

[0091] Acid-base titration equipment: including burette, conical flask, standard hydrochloric acid solution and indicator;

[0092] Online pH monitor: collects pH value data of quench water in real time, with a monitoring accuracy of ±0.1;

[0093] Ion chromatograph: used for high-precision determination of chloride concentration;

[0094] Filter equipment and electronic balance: used for the measurement of suspended particles.

[0095] Detection frequency

[0096] After each batch of quench water is delivered to the storage tank, it is necessary to take samples immediately and complete a comprehensive test;

[0097] During storage, the sodium carbonate concentration and pH value must be sampled and tested once every shift (8 hours);

[0098] Regular testing of impurity concentrations (suspended particulate matter and chlorides) is carried out once a week.

[0099] Processing of test results

[0100] Insufficient concentration treatment: If the test result shows that the sodium carbonate concentration is lower than 0.1 mol / L, high-purity sodium carbonate solid needs to be added to the storage tank, stirred and dissolved, and then tested again;

[0101] Treatment of excessive concentration: If the sodium carbonate concentration is higher than 0.3 mol / L, dilute it by adding process water and stir evenly to ensure that the concentration returns to the target range;

[0102] Treatment of impurities exceeding the limit: If the concentration of suspended particles or chlorides exceeds the limit, it can be solved by increasing the number of filtration times or replacing the filter.

[0103] Data recording and uploading

[0104] Each test result must be recorded in the database of the central control system, including sodium carbonate concentration, pH value, suspended particulate matter concentration and chloride concentration;

[0105] After the data is uploaded, it will be used as a reference for subsequent dynamic transportation and dosing.

[0106] Safety assurance during the testing process

[0107] The testing operation should be carried out in a laboratory or closed environment, and the operator should wear protective gloves, protective glasses and lab coats;

[0108] Avoid splashing of liquid during sampling and titration, and collect and centrally treat waste liquid.

[0109] S4. For step S3 only, the main body format needs to be as follows: For step S3, first give a general description content, here you need to consider the necessary related description sentences between the context, to be logical, and then according to the disclosure or the technical implementation content discussed above, give a detailed description of step S3, the format is "In this embodiment, XXXX" The description of the effect should not be too much, the description should not be too exaggerated, the related technical solutions discussed previously should all be described here. All the previously discussed contents need to be given.

[0110] In this embodiment, for step S4 (pretreatment of quench water), the specific technical implementation content is as follows:

[0111] Removal of suspended particles

[0112] Filtration treatment: The suspended particles in the quenching water are removed through the filtration device.

[0113] Filter selection: Use a stainless steel filter with a pore size of 100μm for coarse filtration to remove large suspended particles;

[0114] Filtration equipment: The filter is installed at the outlet pipe of the storage tank to ensure that the impurity concentration has been greatly reduced when it is transported to the pretreatment stage;

[0115] Operation method: Clean the filter device every 8 hours to ensure that the filter is unobstructed.

[0116] Sedimentation treatment: For quench water that still has a small amount of fine particles after filtration, it can be further removed by gravity sedimentation:

[0117] Sedimentation design: A sedimentation valve is installed at the bottom of the storage tank, which is opened every 8 hours to discharge the deposited impurities;

[0118] Sedimentation treatment cycle: The sedimentation valve is operated regularly every shift to ensure that there is no accumulation of impurities at the bottom of the tank.

[0119] Adjustment of sodium carbonate concentration

[0120] Treatment of insufficient concentration:

[0121] If the test results show that the sodium carbonate concentration is lower than 0.1 mol / L, add high-purity sodium carbonate solid to the storage tank for replenishment;

[0122] Addition ratio: According to the calculation results, gradually add the missing amount of sodium carbonate in solid form to the quenching water. Stir for 10 minutes after each addition and check the concentration again to confirm whether it meets the standard.

[0123] Treatment of excessive concentration:

[0124] When the sodium carbonate concentration is higher than 0.3 mol / L, the quench water concentration is diluted by adding process water to the storage tank;

[0125] Dilution calculation formula:

[0126]

[0127] Among them, V 稀释水 is the volume of process water to be added, C 现有浓度 is the current concentration, C 目标浓度 is the target concentration, V 急冷水 is the current volume of quench water.

[0128] After dilution is complete, stir to evenly distribute the concentration and test again to ensure that the concentration is within the range.

[0129] Temperature and flow control

[0130] During the concentration adjustment process, the temperature of the quench water is maintained at 15-25°C by the temperature control device of the storage tank to prevent crystallization or uneven distribution of sodium carbonate due to temperature changes.

[0131] Operation of the stirring device: turn on the stirring device immediately after the concentration is adjusted, with a stirring speed of 50-150rpm to ensure that the supplemented high-purity sodium carbonate or the added dilution water is fully mixed with the original quenching water.

[0132] Detection and confirmation

[0133] After the pretreatment is completed, the quench water samples are tested again, focusing on the sodium carbonate concentration and suspended particulate matter content:

[0134] Ensure that the sodium carbonate concentration range is between 0.1 and 0.3 mol / L;

[0135] Ensure that the concentration of suspended particulate matter is ≤20mg / L.

[0136] If the test result still does not meet the requirements, repeat the filtration or concentration adjustment steps until the target value is reached.

[0137] Data Recording and Management

[0138] After each pretreatment operation is completed, record the treatment method and adjustment parameters of the quench water, including:

[0139] The number of times the filter is cleaned and the opening time of the sedimentation valve;

[0140] The amount of high-purity sodium carbonate added or the amount of dilution process water;

[0141] Final sodium carbonate concentration and suspended particulate matter content.

[0142] All data are uploaded to the central control system to provide reference for subsequent dynamic transportation links.

[0143] Operation and safety requirements

[0144] Pretreatment operations must be carried out in an environment with complete protective equipment. Operators must wear protective gloves and goggles to avoid direct skin contact with high-purity sodium carbonate or quenching water.

[0145] During filtration and sedimentation treatment, it is necessary to ensure that the equipment operates normally, regularly check the sealing of the filtration device and sedimentation valve, and replace or repair them in time if any abnormality is found.

[0146] S5. For step S5 (dynamic delivery and addition of quench water), after the pretreatment of the quench water is completed, it needs to be transported to the sewage treatment neutralization tank through the delivery system, and the dosage of quench water is dynamically adjusted according to the real-time pH value of the sewage. The dynamic delivery and addition of quench water directly affects the effect of sewage neutralization. Therefore, this step needs to be combined with a flow monitoring device, an intelligent dosing control system, and a sealing design of the delivery pipeline to ensure that the flow of quench water during the delivery process is accurately controllable and avoids leakage. This link also needs to be combined with real-time monitoring data of sewage treatment to optimize the dosage of quench water through an intelligent system.

[0147] In this embodiment, for step S5 (dynamic delivery and addition of quenching water), the specific technical implementation content is as follows:

[0148] Design and configuration of conveying system

[0149] Delivery pump:

[0150] The quench water is delivered by a 2kW stainless steel delivery pump with a rated flow range of 50 to 200L / min, which meets the continuous addition demand of quench water in sewage treatment.

[0151] The pump is made of 304 stainless steel, which has excellent corrosion resistance and can transport liquids containing alkaline chemical components for a long time.

[0152] Delivery pipeline:

[0153] The pipe material is 304 stainless steel or PE (polyethylene), and the inner diameter of the pipe is 50mm, ensuring smooth liquid transportation without the risk of blockage.

[0154] The delivery pipeline is equipped with sealing gaskets and leak-proof interfaces, and key connections are reinforced to prevent leakage due to pressure fluctuations during operation.

[0155] Flow meter:

[0156] An online flow meter is installed in the delivery pipeline to monitor the delivery flow of quench water in real time with a monitoring accuracy of ±5%;

[0157] The flow meter is linked with the control system to record the flow data in real time and feed it back to the control center.

[0158] Intelligent dosing system

[0159] Dosing control logic:

[0160] Install an online pH monitor in the sewage treatment neutralization tank to collect sewage pH data in real time;

[0161] The dosing system automatically adjusts the amount of quench water added through the PLC (Programmable Logic Controller) to ensure that the pH value of the sewage is maintained within the range of 8.5 to 9.5.

[0162] Initial dosage setting:

[0163] The initial setting of the quench water dosage is per 100m 3 Add 50 to 200L of quenching water to the sewage, and the specific value is dynamically adjusted according to the acidity strength of the sewage and detection feedback.

[0164] Dosing mode:

[0165] The continuous dosing mode is adopted, and the quenching water is evenly distributed in the neutralization tank through the spray device to avoid uneven neutralization due to excessive local concentration;

[0166] When the pH value fluctuates greatly, switch to intermittent dosing mode to adjust the pH of the sewage through high-frequency detection and multiple small-amount dosing.

[0167] Safety management of transportation process

[0168] Prevent leaks:

[0169] During the transportation process, check the pipeline sealing status regularly. If any abnormality is found, shut down the pump immediately and replace related parts;

[0170] Install emergency shut-off valves at key locations on the pipeline to quickly control leakage risks.

[0171] Abnormal flow alarm:

[0172] The flow meter is equipped with an alarm function. When the delivery flow is abnormal (such as exceeding 200L / min or falling below 50L / min), the alarm system is triggered and the pump is automatically stopped.

[0173] Mixing after conveying

[0174] Mixing equipment:

[0175] A mechanical stirring device is installed in the neutralization tank. The stirring paddle is made of corrosion-resistant stainless steel and has a designed speed range of 30 to 80 rpm.

[0176] The stirring device ensures that the quench water and sewage are fully mixed to avoid local insufficient or excessive neutralization.

[0177] Mixing operation strategy:

[0178] The stirring device keeps running continuously during the addition process; after the addition is completed, it can run intermittently according to the state of the liquid in the pool, and the stirring time shall not be less than 15 minutes each time.

[0179] Operation data recording of conveying and dosing

[0180] Data collection and storage:

[0181] During the transportation process, all data from the flow meter, pH monitor and PLC controller are uploaded to the central control system;

[0182] The records include the addition time, delivery flow, initial pH value of the sewage and the target pH value after adjustment.

[0183] Data Analysis:

[0184] Operators check the dosing data and pH value adjustment curve every shift, and adjust the dosing parameters or troubleshoot the delivery system problems in a timely manner if any abnormalities are found.

[0185] Operation and maintenance requirements

[0186] Equipment inspection:

[0187] Check the delivery pumps, pipelines, valves and flow meters every shift to ensure the equipment is operating normally;

[0188] Perform comprehensive maintenance on the stirring device every week and clean any impurities that may be attached to the surface of the stirring paddle.

[0189] Operational safety:

[0190] Operators must wear protective equipment (such as anti-corrosion gloves and protective glasses) and receive regular training on relevant equipment operation.

[0191] S6. For step S6 (neutralization of sewage treatment), after the dynamic delivery and addition of quench water, the quench water and sewage undergo a neutralization reaction in the neutralization tank, thereby adjusting the pH value of the sewage to the target range (8.5-9.5). The core of the neutralization reaction is the chemical reaction between the sodium carbonate in the quench water and the acidic components in the sewage. Through effective mixing and stirring and real-time pH monitoring, the pH value of the sewage is ensured to be stable and meet the discharge requirements. This step also needs to pay attention to the abnormal reaction or local over-neutralization problems that may occur during the neutralization process, which are solved through precise control and online monitoring.

[0192] In this embodiment, for step S6 (neutralization of sewage treatment), the specific technical implementation content is as follows:

[0193] Principle of Neutralization Reaction

[0194] Sodium carbonate (Na2CO3) in the quench water reacts with acidic pollutants (such as H2SO4, HCl, etc.) in the sewage to neutralize. The reaction equation is as follows:

[0195] Na2CO3+H2SO4→Na2SO4+H2O+CO2↑

[0196] Na2CO4+2HCL→2NaCl+H2O+CO2↑

[0197] The carbon dioxide (CO2) released during the reaction can be discharged through the exhaust device, and the reaction products are neutral salt and water without secondary pollution.

[0198] Equipment configuration of neutralization pool

[0199] Neutralization tank structure:

[0200] The pool body adopts reinforced concrete structure, and the inner wall is coated with corrosion-resistant waterproof layer. The design capacity is 50-100m 3 ;

[0201] An exhaust pipe is provided in the pool to release the CO2 gas generated during the neutralization reaction and avoid gas accumulation in the pool.

[0202] Stirring device:

[0203] A mechanical agitator is installed at the bottom of the neutralization tank. The agitator paddle is made of 316 stainless steel, which is corrosion-resistant and stable in operation.

[0204] The speed control range of the agitator is 30-80rpm to ensure that the quench water and sewage are fully mixed in the tank.

[0205] Online monitoring device:

[0206] The pH monitor collects the pH value data of sewage in real time, with a monitoring accuracy of ±0.1;

[0207] The data is uploaded to the central control center by the online monitoring system and linked to the quench water addition system.

[0208] Operational Control of Neutralization Process

[0209] Initial operation:

[0210] According to the initial pH value of the sewage and the concentration of acidic pollutants, the initial dosage of quenching water is determined (refer to step S5), and the stirring device is turned on to form a uniform liquid mixing state.

[0211] Dynamic Adjustment:

[0212] The online pH monitor monitors the pH value of sewage in real time. If the pH value does not reach the target range (8.5-9.5), the system automatically adjusts the amount of quench water added;

[0213] In case of large fluctuations in local pH value, adjustments can be made by temporarily increasing the stirring speed or intermittently adding quenching water.

[0214] Reaction Monitoring:

[0215] During the reaction, observe whether there are abnormal bubbles in the neutralization tank (excessive release of CO2 may indicate excessive addition of quench water);

[0216] If abnormal reaction is found, it can be handled by temporarily stopping the addition of quenching water and reducing the stirring rate.

[0217] Neutralization effect detection

[0218] pH determination:

[0219] Use an online pH monitor to record the pH value of the neutralized wastewater in real time, with a target range of 8.5 to 9.5;

[0220] If the pH value deviates from the target range, the quench water addition rate must be adjusted immediately based on the monitoring data.

[0221] Chemical oxygen demand (COD) detection:

[0222] The COD of the neutralized wastewater is tested by the potassium dichromate method to ensure that it meets the discharge standards (≤60mg / L).

[0223] Ammonia nitrogen and total nitrogen detection:

[0224] The concentrations of ammonia nitrogen and total nitrogen were tested using ultraviolet spectrophotometry to confirm that the water quality after neutralization met the discharge requirements.

[0225] Suspended matter concentration detection:

[0226] The suspended solids concentration in sewage is tested using the gravimetric method, with a target value of ≤20 mg / L.

[0227] Exception handling measures

[0228] Insufficient neutralization:

[0229] If the pH value is continuously low (<8.5), solve the problem by increasing the quench water addition rate or increasing the addition time;

[0230] If the sewage is too acidic, it can be supplemented and neutralized by short-term auxiliary addition of liquid alkali (NaOH).

[0231] Over-neutralization:

[0232] If the pH value is high (>9.5), stop adding quench water immediately and adjust the pH value back to the target range by dilution (adding process water).

[0233] Data recording and feedback

[0234] Data Records:

[0235] Record the data such as the amount of quench water added, sewage pH value, COD, ammonia nitrogen and total nitrogen concentration every hour during the neutralization process;

[0236] The data is stored in the central control system for subsequent optimization of the quench water addition strategy.

[0237] Feedback and Optimization:

[0238] Regularly analyze the operating data of the neutralization tank. If the neutralization efficiency is found to be reduced or the sewage indicators are fluctuating, the concentration of the quench water needs to be adjusted and the dosage needs to be re-optimized.

[0239] Operation and safety requirements

[0240] Operation Specifications:

[0241] The stirring device in the neutralization tank must be started before adding quenching water and keep running continuously;

[0242] A fence must be set up around the pool to prevent non-operating personnel from approaching.

[0243] Safety protection:

[0244] During the treatment process, operators must wear protective gloves, protective glasses and anti-corrosion clothing to avoid direct contact with sewage or quench water.

[0245] S7. For step S7 (detection and feedback), after completing the addition of quench water and sewage treatment neutralization, it is necessary to conduct real-time detection of the neutralized sewage to ensure that the sewage treatment effect meets the emission standards. This step focuses on the detection of key indicators of sewage (such as pH value, chemical oxygen demand (COD), ammonia nitrogen, suspended solids, etc.), as well as the recording, analysis and feedback of the detection data. The test results will directly affect the subsequent adjustment of the amount of quench water added and the optimization of the neutralization process, and are an important link in achieving a closed-loop process. Through comprehensive detection methods and data management mechanisms, the stability and long-term effectiveness of the entire process can be ensured.

[0246] In this embodiment, for step S7 (detection and feedback), the specific technical implementation content is as follows:

[0247] Test items

[0248] pH value:

[0249] The pH value of the neutralized wastewater is detected in real time using an online pH monitor, with a target range of 8.5 to 9.5. The online pH monitor has a monitoring accuracy of ±0.1, and the data is recorded and uploaded to the central control system once a minute.

[0250] Chemical oxygen demand (COD):

[0251] The potassium dichromate method is used to detect the COD concentration of the neutralized wastewater to ensure that it meets the discharge standards (≤60mg / L).

[0252] Manual sampling is performed once per shift (8 hours) for laboratory testing, and the test results are used to verify the neutralization effect of the process.

[0253] Ammonia nitrogen and total nitrogen:

[0254] Use ultraviolet spectrophotometry to detect the ammonia nitrogen and total nitrogen concentrations in the neutralized wastewater. The target values ​​must meet the national wastewater discharge standards (ammonia nitrogen ≤ 15 mg / L, total nitrogen ≤ 30 mg / L).

[0255] The testing frequency is once a day, with a focus on monitoring the impact of nitrogen compounds that may be contained in the quench water on the discharge water quality.

[0256] Suspended matter:

[0257] The suspended solids concentration in sewage is tested by gravimetric method, with a target range of ≤20 mg / L;

[0258] After filtering the sample, the residue is dried and weighed, and the suspended solids concentration is calculated. The test is conducted once per shift.

[0259] Data Recording and Management

[0260] Data collection and storage:

[0261] All online monitoring data (such as pH value, flow data) are automatically uploaded to the central control system;

[0262] Laboratory test data (COD, ammonia nitrogen, suspended solids concentration) are manually entered into the system by testers and updated daily.

[0263] Data content:

[0264] The amount of quench water added, the pH value of the sewage after treatment, the COD concentration, and the ammonia nitrogen and total nitrogen concentrations are recorded in each shift.

[0265] Trend Analysis:

[0266] The central control system performs trend analysis on historical data to generate pH fluctuation curves, COD change curves, etc., to help operators determine whether the process operation status is stable.

[0267] Feedback mechanism for test data

[0268] Real-time feedback and adjustments:

[0269] The online pH monitoring data is directly linked to the quench water dosing control system. When the pH value is detected to deviate from the target range (8.5-9.5), the system automatically adjusts the quench water dosage based on the feedback data.

[0270] COD and ammonia nitrogen data are used to determine whether the neutralization effect meets the standard. If the COD concentration exceeds the standard, it is necessary to increase the stirring efficiency or add other treatment agents (such as flocculants); if the ammonia nitrogen concentration exceeds the standard, it is necessary to adjust the dilution ratio of the quench water or supplement subsequent treatment links.

[0271] Abnormal situation handling:

[0272] If the test data is abnormal, such as the pH value continues to fluctuate greatly or the COD concentration exceeds the standard, it is necessary to conduct a comprehensive inspection of the amount of quench water added, the concentration adjustment link, and the stirring efficiency of the neutralization tank;

[0273] If the wastewater fails to meet the standards for three consecutive times, the operator needs to take temporary measures (such as stopping the addition of quench water, switching to backup neutralizers, etc.) to ensure that the wastewater treatment meets the discharge standards.

[0274] Data utilization and optimization

[0275] Run the report:

[0276] The system automatically generates a process operation report every day, including the amount of quench water added, pH value adjustment range, sewage test results and abnormal operation records;

[0277] The data is summarized and analyzed monthly, and trend reports are generated for long-term optimization of process parameters.

[0278] Optimization strategy:

[0279] Based on historical data, machine learning algorithms are used to predict the demand for quench water and the frequency of addition, and to dynamically optimize the operating parameters of the neutralization tank;

[0280] Improve the weak links in the neutralization process (such as untimely adjustment of stirring efficiency or quench water concentration) to improve the efficiency and stability of wastewater neutralization.

[0281] Safety and operational requirements

[0282] Calibration of testing equipment:

[0283] The online pH monitor is calibrated weekly and the performance of the potassium dichromate method experimental equipment is tested monthly to ensure the accuracy and consistency of the data.

[0284] Operation Specifications:

[0285] Testing personnel must strictly follow the operating procedures for sampling and data entry, and must wear protective equipment during the experiment;

[0286] The operating status of the online monitoring equipment must be checked by dedicated personnel once per shift, and any faults must be repaired in a timely manner.

[0287] S8. For step S8 (long-term management and optimization), on the basis of completing the neutralization and detection feedback of sewage treatment, in order to ensure the stability and economic benefits of the process, the entire quench water reuse system needs to be operated and maintained for a long time and technically optimized. This step mainly includes regular maintenance of equipment, long-term storage and analysis of data, and process optimization strategies based on data feedback. By building a complete management and optimization system, the reuse efficiency of quench water can be continuously improved and the overall operating cost can be reduced, while ensuring the long-term compliance and stability of the sewage treatment process.

[0288] In this embodiment, for step S8 (long-term management and optimization), the specific technical implementation content is as follows:

[0289] Regular maintenance and management of equipment

[0290] Conveyor system maintenance:

[0291] Check the quench water delivery pump and delivery pipeline every week to ensure that the pump flow output is stable and there is no blockage or leakage in the pipeline;

[0292] The seals and flow meters of the delivery pumps are calibrated and replaced every month to ensure the accuracy of the monitoring data and the operational stability of the equipment.

[0293] Storage tank maintenance:

[0294] Clean the storage tank thoroughly every quarter to remove impurities and possible scaling deposited on the bottom of the tank to avoid corrosion of the inner wall of the storage tank during long-term operation;

[0295] The temperature control device should be tested for performance every six months to ensure the normal operation of the heating or cooling function.

[0296] Neutralization tank and stirring device maintenance:

[0297] Check the stirring blades of the neutralization tank every month to see if there is dirt attached, and clean them if necessary;

[0298] Carry out lubrication and operation test on the stirring motor to ensure that the stirring speed and operating status meet the design requirements.

[0299] Long-term data storage and analysis

[0300] Data Storage:

[0301] Upload the quench water delivery volume, dosage, sewage test results (pH value, COD, ammonia nitrogen, suspended solids, etc.) and operation parameter data to the central data management system and save them for at least one year;

[0302] The data is stored by timeline and historical curves are generated to facilitate analysis of operating trends and identification of potential problems.

[0303] Data Analysis:

[0304] Summarize and analyze the data monthly to evaluate the correlation between the amount of quench water added and the neutralization efficiency, and determine whether there is a waste of resources or insufficient addition;

[0305] Trace the causes of links with multiple abnormalities (such as dosage fluctuations, unstable pH values) and formulate corresponding improvement measures.

[0306] Optimization strategy based on data feedback

[0307] Optimize dosing parameters:

[0308] Based on historical data, the dosage setting range is optimized by analyzing the concentration fluctuation of quench water, the relationship between dosage and sewage pH value;

[0309] Use machine learning algorithms to predict the demand for quench water and dynamically adjust the dosing frequency and acceleration rate to avoid over-dosing or under-dosing.

[0310] Improved concentration adjustment strategy:

[0311] For the problem of insufficient or excessive sodium carbonate concentration that occurs repeatedly, the accuracy of adjusting the concentration of quench water can be improved by increasing the detection frequency or improving the dilution and replenishment process;

[0312] Introduce online concentration monitoring equipment to achieve real-time monitoring of the quench water concentration in the storage tank.

[0313] Improve neutralization efficiency:

[0314] The uniformity and rapid response of the neutralization process are ensured by optimizing stirring, improving the quench water spray distribution and analyzing the dynamic flow of liquid in the neutralization tank.

[0315] Add sewage testing indicators (such as total phosphorus concentration after neutralization, etc.) to more comprehensively evaluate the treatment effect.

[0316] Abnormal operation management

[0317] Establish an alarm mechanism:

[0318] When key indicators such as pH value, COD, and ammonia nitrogen deviate from the target range, the system automatically triggers an alarm and records abnormal data;

[0319] Operators need to check the dosing equipment and the operating status of the neutralization tank in time, adjust the quench water concentration or replace the neutralizer.

[0320] Contingency Plan:

[0321] Develop detailed emergency plans, covering equipment failure, dosing system abnormalities, excessive sewage discharge, etc.;

[0322] Set up backup neutralizing agents (such as liquid caustic soda) and auxiliary treatment equipment to ensure the normal operation of the process when the quench water supply or addition is insufficient.

[0323] Process improvement and long-term upgrade

[0324] Equipment Upgrade:

[0325] Evaluate the performance and economy of the equipment based on operating data, and regularly introduce new equipment such as high-efficiency pumps and automated dosing control devices to improve system operating efficiency.

[0326] Expanded use of quench water:

[0327] In addition to sewage treatment and neutralization, explore other industrial uses of quench water (such as boiler cleaning, water treatment, etc.) to maximize its resource utilization value.

[0328] Standard improvement:

[0329] In combination with national environmental protection policies and new sewage discharge standards, the sewage treatment plan is dynamically adjusted to ensure that the treatment process always meets the latest requirements.

[0330] Operation and staff training

[0331] Operation standardization:

[0332] Formulate detailed equipment maintenance manuals, operating procedures and abnormal situation handling procedures for operators to refer to and implement;

[0333] Regularly carry out skills training related to equipment inspection, troubleshooting and data analysis to improve personnel's ability to control process operations.

[0334] Assessment Mechanism:

[0335] Establish performance evaluation indicators for operators, such as equipment operation stability, sewage treatment compliance rate, etc., to motivate personnel to improve work efficiency.

[0336] Embodiment 1:

[0337] Verify the optimal operating conditions for neutralizing wastewater in quench water, including the effects of quench water dosage, stirring speed and storage temperature on the neutralization effect.

[0338] Experimental conditions:

[0339] The sodium carbonate concentration of the quench water is 0.2 mol / L;

[0340] The storage temperature is set at 20°C;

[0341] The initial pH value of the sewage is 3.5, which needs to be adjusted to the target range of 8.5 to 9.5;

[0342] The initial dosage is set to every 100m 3 150L of quench water was added to the sewage, and the stirring speed was 50rpm.

[0343] Steps:

[0344] The quench water is delivered from the storage tank to the sewage treatment neutralization tank by a delivery pump, and the dosage is accurately monitored by a flow meter;

[0345] The mechanical stirring device in the neutralization tank is turned on at a stirring speed of 50 rpm, and the pH value of the sewage is detected in real time during the dosing process;

[0346] If the pH value exceeds the target range, reduce the amount of quench water added; if the pH value is insufficient, increase the amount appropriately.

[0347] After the addition is completed, the neutralization effect indicators are recorded, including effluent pH value, COD concentration, ammonia nitrogen concentration and suspended solids concentration.

[0348] Experimental results:

[0349] After neutralization, the pH value of the wastewater is stabilized at 8.7, the COD concentration is 45 mg / L, the ammonia nitrogen concentration is 12 mg / L, and the suspended solids concentration is 15 mg / L;

[0350] During the addition process, there was no excessive release of CO2 or local over-neutralization, and the utilization rate of quenching water was high.

[0351] analyze:

[0352] Under this condition, the storage temperature, quench water concentration and dosage are relatively matched, the process is stable, and the sewage indicators meet the emission standards, which is suitable as a reference for the optimal operating conditions.

[0353] Embodiment 2:

[0354] Explore the effects of different stirring speeds on sewage neutralization uniformity and quench water utilization efficiency.

[0355] Experimental conditions:

[0356] The sodium carbonate concentration of the quench water is 0.15 mol / L;

[0357] The storage temperature is set at 25°C;

[0358] The initial pH value of the sewage is 3.2, which needs to be adjusted to the target range of 8.5 to 9.5;

[0359] The dosage is set to every 100m 3 200 L of quench water was added to the sewage, and the stirring speeds were set to 30 rpm, 50 rpm, and 80 rpm, respectively.

[0360] Steps:

[0361] The quenching water was added at stirring speeds of 30 rpm, 50 rpm and 80 rpm respectively;

[0362] During the dosing process, the pH value of sewage is tested online and the neutralization uniformity is recorded;

[0363] After each experiment, the pH value, COD concentration, ammonia nitrogen concentration and suspended solids concentration of the water were tested.

[0364] Experimental results:

[0365] 30rpm: The pH value of sewage fluctuates significantly locally, COD concentration is 62mg / L, ammonia nitrogen concentration is 14mg / L, and suspended solids concentration is 20mg / L;

[0366] 50rpm: The pH value of sewage fluctuates slightly and finally stabilizes at 8.6, the COD concentration is 50mg / L, the ammonia nitrogen concentration is 13mg / L, and the suspended solids concentration is 18mg / L;

[0367] 80rpm: The stirring intensity is too high, resulting in turbulence of the liquid in the pool, increased CO2 release, poor pH stability, COD concentration of 56mg / L, ammonia nitrogen concentration of 12mg / L, and suspended matter concentration of 19mg / L.

[0368] analyze:

[0369] The neutralization uniformity is optimal at a stirring speed of 50rpm, the quenching water utilization efficiency is high, and the sewage treatment indicators meet the emission standards.

[0370] Too low a stirring speed will result in insufficient local neutralization, while too high a stirring speed will easily cause abnormal reactions.

[0371] Embodiment three:

[0372] Evaluate the impact of quench water concentration on wastewater treatment performance and resource utilization.

[0373] Experimental conditions:

[0374] The storage temperature is set at 15°C;

[0375] The initial pH value of the sewage is 3.8, which needs to be adjusted to the target range of 8.5 to 9.5;

[0376] The dosage is set to every 100m 3 Add 150L of quench water to the sewage, and the stirring speed is 50rpm;

[0377] The sodium carbonate concentrations of the quench water are 0.10 mol / L, 0.20 mol / L and 0.30 mol / L respectively.

[0378] Steps:

[0379] Adjust the sodium carbonate concentration of the quench water separately to achieve the target concentration by adding high-purity sodium carbonate or diluting process water;

[0380] Add quench water to the neutralization tank and record the pH value curve and dosage of sewage under each concentration condition;

[0381] After completing the experiment under each concentration condition, the pH value, COD concentration, ammonia nitrogen concentration and suspended solids concentration of the water were detected.

[0382] Experimental results:

[0383] 0.10mol / L: 250L of quench water is required to stabilize the pH value of sewage at 8.5, COD concentration at 60mg / L, ammonia nitrogen concentration at 15mg / L, and suspended solids concentration at 22mg / L;

[0384] 0.20mol / L: After adding 150L of quench water, the pH value is stabilized at 8.7, the COD concentration is 48mg / L, the ammonia nitrogen concentration is 12mg / L, and the suspended solids concentration is 16mg / L;

[0385] 0.30mol / L: Only 120L of quench water is needed to reach the target pH value, but the COD concentration fluctuates greatly, which is 55mg / L, the ammonia nitrogen concentration is 13mg / L, and the suspended solids concentration is 18mg / L.

[0386] analyze:

[0387] When the concentration of sodium carbonate in quench water is 0.20 mol / L, the dosing efficiency is the best and the sewage treatment effect is stable;

[0388] If the concentration is too low, the dosage will increase, while if the concentration is too high, it may cause excessive local reaction and affect uniformity.

[0389] Table 1 Comparison of experimental conditions

[0390]

[0391] Table 2 Experimental results comparison table

[0392]

[0393]

[0394] 1. Embodiment 1

[0395] Conditions: quench water concentration 0.20 mol / L, stirring speed 50 rpm, storage temperature 20°C, dosage 150 L / 100 m 3 Sewage.

[0396] Results: The pH value reached 8.7, the COD concentration was 45 mg / L, the ammonia nitrogen concentration was 12 mg / L, and the suspended solids concentration was 15 mg / L, all meeting the emission standards.

[0397] The concentration of quench water is moderate, the dosage is reasonable, and the stirring speed ensures the uniformity of the neutralization process;

[0398] The reduction effect of COD and ammonia nitrogen is significant, and the concentration of suspended solids is kept at a low range;

[0399] It has the best overall performance and is suitable as a reference solution for optimal operating conditions.

[0400] 2. Example 2 (Stirring Speed ​​Variable)

[0401] Conditions: quench water concentration is 0.15mol / L, storage temperature is 25℃, dosage is 200L / 100m 3 For sewage, the stirring speeds are 30rpm, 50rpm and 80rpm respectively.

[0402] result:

[0403] 30rpm: pH value is 8.5, COD concentration is 62mg / L, ammonia nitrogen concentration is 14mg / L, and suspended solids concentration is 20mg / L;

[0404] 50rpm: pH value is 8.6, COD concentration is 50mg / L, ammonia nitrogen concentration is 13mg / L, and suspended solids concentration is 18mg / L;

[0405] 80rpm: pH value is 8.5, COD concentration is 56mg / L, ammonia nitrogen concentration is 12mg / L, and suspended matter concentration is 19mg / L.

[0406] The low stirring speed (30 rpm) resulted in an uneven neutralization process and high COD and suspended solids concentrations;

[0407] Moderate stirring speed (50 rpm) showed the best neutralization uniformity and quenching water utilization efficiency;

[0408] Although high stirring speed (80 rpm) makes the neutralization process faster, it can easily lead to turbulence of the liquid in the tank and reduce the treatment stability;

[0409] Conclusion: The best stirring speed is 50 rpm.

[0410] 3. Example 3 (Quenching Water Concentration Variable)

[0411] Conditions: stirring speed 50 rpm, storage temperature 15°C, dosages 250 L (0.10 mol / L), 150 L (0.20 mol / L), 120 L (0.30 mol / L), respectively.

[0412] result:

[0413] 0.10mol / L: pH value is 8.5, COD concentration is 60mg / L, ammonia nitrogen concentration is 15mg / L, and suspended solids concentration is 22mg / L;

[0414] 0.20mol / L: pH value is 8.7, COD concentration is 48mg / L, ammonia nitrogen concentration is 12mg / L, and suspended solids concentration is 16mg / L;

[0415] 0.30 mol / L: pH value is 8.6, COD concentration is 55 mg / L, ammonia nitrogen concentration is 13 mg / L, and suspended matter concentration is 18 mg / L.

[0416] Low concentration (0.10mol / L): The amount of quench water added is greatly increased, the resource utilization efficiency is low, and the COD and suspended solids concentrations are high;

[0417] Medium concentration (0.20 mol / L): shows the best neutralization effect, COD and suspended solids concentrations are significantly reduced, and the amount of quenching water added is moderate;

[0418] High concentration (0.30 mol / L): The dosage is reduced, but the COD fluctuation is aggravated and the suspended solids concentration is also higher;

[0419] Conclusion: When the quenching water concentration is 0.20 mol / L, the resource utilization efficiency and sewage treatment effect are optimal.

[0420] Comprehensive analysis:

[0421] Optimal implementation conditions:

[0422] Quenching water concentration: 0.20mol / L;

[0423] Stirring speed: 50 rpm;

[0424] Storage temperature: 20℃;

[0425] Dosage: 150L / 100m 3 Sewage.

[0426] Quenching water concentration: Maintained at 0.20 mol / L, it can ensure good neutralization ability while avoiding excessive concentration that leads to increased dosage or excessive concentration that leads to waste of resources.

[0427] Stirring speed: controlled at 50 rpm to ensure uniformity of neutralization and avoid liquid turbulence.

[0428] Storage temperature: Maintain at around 20°C to prevent sodium carbonate crystallization or reduced reaction efficiency.

[0429] The combination of dosage, concentration, stirring speed and storage temperature in Example 1 performs best in various indicators, the pH value is stable, and the COD, ammonia nitrogen and suspended solids concentrations are all lower than the emission standards. It is the recommended best implementation method.

[0430] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for recycling quenching water, characterized in that: The following steps are involved: (1) Collection of quenching water: The quenching water in the quenching pool of the incinerator is transported to the storage tank through a delivery pump. The delivery pump is 2kW and the delivery pipeline is made of 304 stainless steel or PE; (2) Storage of quench water: The quench water is stored in a storage tank, wherein the storage tank is provided with a stirring device to prevent sodium carbonate deposition, and a temperature control device to control the liquid temperature at 150.3 mol / L; (5) Transportation and addition of quench water: The quench water is transported to the sewage treatment neutralization tank through a pipeline, and the delivery pipeline is equipped with a flow meter and an electric valve for real-time monitoring and adjustment of the delivery flow of the quench water; (6) Neutralization of sewage treatment: The pH value of the sewage is adjusted to 8.5-9.5 using quench water, and a stirring device is installed in the neutralization tank to promote mixing of quench water and sewage; (7) Testing and feedback: The pH value, COD, ammonia nitrogen and suspended solids of the neutralized wastewater are tested, and the amount of quench water added is adjusted according to the test results.

2. A quench water recycling method according to claim 1, characterized in that: The stirring device of the storage tank is a stirring paddle driven by a motor, and the stirring speed is controlled at 50-150 rpm.

3. A quench water recycling method according to claim 1, characterized in that: The temperature control device of the storage tank is an electric heater or a cooling system, and the temperature control device controls the storage environment temperature within the range of 15 to 25°C.

4. A quench water recycling method according to claim 1, characterized in that: The detection of the quench water comprises the following steps: (1) Detecting the sodium carbonate concentration of quench water by acid-base titration; (2) Determine the concentration of suspended particles in the quench water by gravimetric method; (3) Measure the pH value of the quench water using a pH meter.

5. A quench water recycling method according to claim 1, characterized in that: The pretreatment of the quenching water includes filtering using a filter screen, and the pore size of the filter screen is 100 μm.

6. A quench water recycling method according to claim 1, characterized in that: An online flow meter is arranged in the delivery pipeline of the quench water, and the monitoring accuracy of the flow meter is ±5%.

7. A method for recycling quenching water according to claim 1, characterized in that: A mechanical stirring device is installed in the sewage treatment neutralization tank, and the stirring speed of the stirring device is 30-80 rpm.

8. A method for recycling quenching water according to claim 1, characterized in that: The detection of the neutralized sewage includes: (1) The pH value of the effluent is monitored in real time by an online pH monitor, with the target range being 8.0 to 8.6; (2) Determination of chemical oxygen demand of effluent water by potassium dichromate method; (3) The concentrations of ammonia nitrogen and total nitrogen in the water were detected by ultraviolet spectrophotometry.

9. A method for recycling quenching water according to claim 1, characterized in that: The detection and feedback are realized through a data acquisition system, which records the dosage of quench water, the pH value, COD and ammonia nitrogen concentration of the effluent, and adjusts the dosage parameters of the quench water through data analysis.

10. A method for recycling quenching water according to claim 1, characterized in that: The optimization of the feedback adjustment is based on historical data, using a machine learning algorithm to predict the demand for quench water and automatically adjust the delivery and dosage.

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