Seawater desulfurization filler performance evaluation system and method

Abstract

The invention discloses a seawater desulfurization filler performance evaluation system and method, and relates to the technical field of seawater flue gas desulfurization. The system comprises a gas supply device, a water supply device, a packed tower and a flue gas analyzer, the gas supply device comprises a mixing unit, a sulfur dioxide gas supply unit, a frequency conversion fan and a diesel generator; the water supply device comprises a variable-frequency pump and a seawater pool; a flue gas inlet of the packed tower is communicated with an outlet of the mixing unit through a first pipe, a first pressure gauge and a first thermometer are arranged on the first pipe, and the first pipe is communicated with a flue gas analyzer through a first branch pipe provided with a first valve; a gas flowmeter is arranged on the packed tower, a flue gas outlet of the packed tower is communicated with the flue gas analyzer through a second pipe, and a second pressure gauge, a second thermometer and a second valve are arranged on the second pipe; a spraying opening of the packed tower is communicated with an outlet of the variable frequency pump. According to the invention, the flue gas desulfurization environment of real seawater can be simulated, and a reliable data basis is provided for evaluating filler performance and optimizing engineering design.

Description

Technical Field

[0001] This application relates to the field of seawater flue gas desulfurization technology, specifically to a performance evaluation system and method for seawater desulfurization packing. Background Technology

[0002] Seawater flue gas desulfurization (FGD) is a wet FGD technology that uses natural seawater as the absorbent. It involves countercurrent contact between seawater and flue gas within a packed tower. The seawater absorbs sulfur dioxide from the flue gas, generating sulfates which are then aerated to restore the pH before being discharged back into the ocean. This process offers advantages such as requiring no freshwater and producing no secondary pollution, and is widely used in emission control for coastal coal-fired power plants and ocean-going vessels. The packed tower is a key piece of equipment in the FGD process. The packing material within the tower plays a crucial role in providing the gas-liquid mass transfer interface and controlling the liquid film thickness and residence time. Its performance directly determines the desulfurization efficiency, system energy consumption, and operational stability. Therefore, establishing a scientific packing material performance evaluation system is a necessary step for continuous process optimization.

[0003] Currently, the performance evaluation of seawater desulfurization packing materials still follows the traditional wet desulfurization experimental model. The principle is as follows: in a small laboratory absorption device, nitrogen and sulfur dioxide are mixed to simulate flue gas, and artificial seawater is prepared by adding sodium bicarbonate or sodium carbonate to tap water. Under constant temperature and a fixed liquid-to-gas ratio, the outlet sulfur dioxide concentration is measured, and the desulfurization efficiency is calculated. Some studies utilize scanning electron microscopy to observe the surface morphology of the packing material, or weigh the amount of dust deposition through short-term clogging experiments, to compare the advantages and disadvantages of bulk packing materials such as Pall rings and Hell rings, as well as structured ceramic packing materials.

[0004] However, the above evaluation methods have the following drawbacks: 1. The gas source does not contain pollutants such as carbon dioxide, oxygen, dust, and heavy metals, and the salinity and ionic composition of the liquid source differ significantly from natural seawater, failing to reflect the impact of the complex composition of actual engineering flue gas and natural seawater on alkalinity competition, oxidation pathways, and scaling tendencies; 2. The laboratory apparatus is small in size, and the wall flow and flow field distribution differ greatly from those of industrial towers, resulting in amplified and distorted mass transfer and pressure drop data; 3. The performance evaluation indicators are singular, focusing only on desulfurization efficiency and lacking a systematic evaluation of comprehensive performance such as pressure drop and anti-clogging. This leads to problems such as soaring pressure drop, frequent clogging, and skyrocketing maintenance costs in engineering applications of high-efficiency packing evaluated in the laboratory. This results in a serious disconnect between the laboratory-selected packing and the actual field operation results, making packing selection lack a comprehensive basis and hindering optimization in engineering applications. Summary of the Invention

[0005] The purpose of this application is to provide a performance evaluation system and method for seawater desulfurization packing materials, which solves the problems of lack of comprehensive basis for packing material selection and difficulty in optimizing engineering applications caused by existing laboratory evaluation methods.

[0006] The technical solution adopted by this application to solve its technical problem is: In the first aspect, a performance evaluation system for seawater desulfurization packing is provided, including an air supply device, a water supply device, a packing tower, and a flue gas analyzer; The gas supply device includes a mixing unit, a sulfur dioxide gas supply unit connected to the inlet of the mixing unit, a variable frequency fan, and a diesel generator; the water supply device includes a variable frequency pump and a seawater pool connected to the inlet of the variable frequency pump. The flue gas inlet of the packed tower is connected to the outlet of the mixing unit through a first pipe. The first pipe is equipped with a first pressure gauge and a first thermometer. The first pipe is connected to the flue gas analyzer through a first branch pipe equipped with a first valve. The packed tower is equipped with a gas flow meter, and the flue gas outlet of the packed tower is connected to the flue gas analyzer through a second pipe. The second pipe is equipped with a second pressure gauge, a second thermometer, and a second valve. The spray port of the packed tower is connected to the outlet of the variable frequency pump.

[0007] Furthermore, the sulfur dioxide gas supply unit includes a sulfur dioxide gas cylinder, a pressure reducing valve, and a float flow meter connected in sequence, with the outlet of the float flow meter connected to the inlet of the mixing unit.

[0008] Furthermore, the mixing unit includes a mixer and a gas heater; the inlet of the mixer is connected to the sulfur dioxide gas supply unit, the variable frequency fan and the diesel generator, the outlet of the mixer is connected to the inlet of the gas heater, and the outlet of the gas heater is connected to the flue gas inlet of the packed tower through the first pipe.

[0009] Furthermore, the water supply device also includes a stirrer and a dosing pump, the stirrer being located inside the seawater pool, and the outlet of the dosing pump being connected to the seawater pool.

[0010] Furthermore, the seawater pool is equipped with a seawater heater.

[0011] Furthermore, the water supply device also includes a sampling tank, which is connected to the seawater pool via a pipe equipped with a third valve, and the sampling tank is equipped with a third thermometer and a first pH meter.

[0012] Furthermore, the water supply device also includes an electric ball valve and an electromagnetic flow meter installed on the pipeline between the variable frequency pump and the packed tower.

[0013] Furthermore, the seawater outlet of the packed tower is connected to the aeration tank via a centrifugal pump, and the aeration tank is also connected to the outlet of the aeration blower.

[0014] Furthermore, a second pH meter is installed on the pipeline between the seawater outlet of the packed tower and the centrifugal pump.

[0015] Secondly, a method for evaluating the performance of seawater desulfurization packing materials is provided, employing a seawater desulfurization packing material performance evaluation system; the method includes: The packing material to be tested was filled into the packing tower, and the height of the packing material was recorded; the seawater to be sprayed was stored in the seawater tank, and the alkalinity, temperature and pH value of the seawater to be sprayed were recorded. Start the gas supply device, close the first valve, open the second valve, and record the flue gas pressure, flue gas temperature, and flue gas flow rate at the flue gas inlet of the packed tower; then open the first valve, close the second valve, and record the sulfur dioxide concentration at the flue gas inlet of the packed tower. Close the first valve, open the second valve, start the water supply device, record the spray volume at the spray nozzle of the packed tower, and record the sulfur dioxide concentration, flue gas pressure, and flue gas temperature at the flue gas outlet of the packed tower.

[0016] The beneficial effects of this application are: The seawater desulfurization packing performance evaluation system and method provided in this application can simulate the real seawater flue gas desulfurization environment, accurately reproduce process parameters within the range of real seawater quality and flue gas operating conditions, and acquire raw data such as desulfurization efficiency and pressure drop characteristics online. This provides a reliable data foundation for studying the law of multi-factor coupling influence, evaluating packing performance, and optimizing engineering design, and solves the problem that existing laboratory evaluation methods lack comprehensive basis for packing selection and are difficult to optimize in engineering applications. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the performance evaluation system for seawater desulfurization packing provided in the embodiments of this application.

[0019] Figure label: 1-Diesel generator; 2-Variable frequency fan; 3-Sulfur dioxide cylinder; 4-Pressure reducing valve; 5-Float flow meter; 6-Mixer; 7-Gas heater; 8-First pressure gauge; 9-First thermometer; 10-Flue gas analyzer; 11-Packed tower; 12-Test packing; 13-Gas flow meter; 14-Aeration fan; 15-Aeration tank; 16-Discharge channel; 17-Sampling tank; 18-Electromagnetic flow meter; 19-Electric ball valve; 20-Variable frequency pump; 21-Agitator; 22-Dosing pump; 23-Seawater heater; 24-First pH meter; 25-Centrifugal pump; 26-Seawater tank; 27-First pipe; 28-First valve; 29-First branch pipe; 30-Second pipe; 31-Second pressure gauge; 32-Second thermometer; 33-Second valve; 34-Third valve; 35-Third thermometer; 36-Second pH meter. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0021] In the description of this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] See Figure 1This application provides a performance evaluation system for seawater desulfurization packing, including an air supply device, a water supply device, a packing tower 11, and a flue gas analyzer 10. The air supply device includes a mixing unit, a sulfur dioxide air supply unit connected to the inlet of the mixing unit, a variable frequency fan 2, and a diesel generator 1. The water supply device includes a variable frequency pump 20 and a seawater pool 26 connected to the inlet of the variable frequency pump 20. The flue gas inlet of the packing tower 11 is connected to the outlet of the mixing unit through a first pipe 27, on which a first pressure gauge 8 and a first thermometer 9 are provided. The first pipe 27 is connected to the flue gas analyzer 10 through a first branch pipe 29 equipped with a first valve 28. A gas flow meter 13 is provided on the packing tower 11. The flue gas outlet of the packing tower 11 is connected to the flue gas analyzer 10 through a second pipe 30, on which a second pressure gauge 31, a second thermometer 32, and a second valve 33 are provided. The spray port of the packing tower 11 is connected to the outlet of the variable frequency pump 20.

[0024] The gas supply device is used to provide simulated flue gas with accurately reproducible temperature, pressure, flow rate, and sulfur dioxide concentration to the packed tower 11 during the performance evaluation of seawater desulfurization packing. The gas supply device includes a diesel generator 1, a variable frequency fan 2, a sulfur dioxide gas supply unit, and a mixing unit. The flue gas outlet of the diesel generator 1, the outlet of the variable frequency fan 2, and the outlet of the sulfur dioxide gas supply unit are all connected to the inlet of the mixing unit. The diesel generator 1 and the variable frequency fan 2 are mainly used to provide the gas source for the simulated flue gas. The flue gas composition produced by the combustion of diesel fuel in the diesel generator 1 can effectively simulate the characteristics of flue gas emitted from real power plants or ships. The variable frequency fan 2 is used to supplement clean air and regulate the total flue gas flow rate, thereby controlling the total amount and composition of the mixed flue gas. The diesel generator 1 and the variable frequency fan 2 can achieve continuous regulation of the total flue gas flow rate through load and frequency adjustments, respectively. The sulfur dioxide gas supply unit is used to inject sulfur dioxide gas into the flue gas before or during mixing, and to achieve precise regulation of the sulfur dioxide concentration in the flue gas through flow control. The mixing unit is used to fully mix diesel exhaust gas, clean air and sulfur dioxide to form simulated exhaust gas with uniform composition and stable parameters, which is then conveyed to the packed tower 11.

[0025] The water supply device is used to provide simulated seawater with accurately reproducible alkalinity, temperature, flow rate, and pH to the packed tower 11 during the performance evaluation of the seawater desulfurization packing. The water supply device includes a seawater tank 26 and a variable frequency pump 20, with the outlet of the seawater tank 26 connected to the inlet of the variable frequency pump 20. The seawater tank 26 stores pretreated seawater, whose alkalinity, pH, and temperature can be precisely adjusted and maintained at target values ​​through the addition of chemicals, heating, etc. The variable frequency pump 20 is used to transport the seawater from the seawater tank 26 to the packed tower 11, and achieves continuous and stable control of the seawater flow rate through frequency regulation.

[0026] The packed tower 11 is a device that allows simulated seawater and simulated flue gas to come into countercurrent contact within it, utilizing the seawater to absorb sulfur dioxide. The middle section of the outer shell of the packed tower 11 is a packing section filled with packing material, which can be individual or multiple sections connected in series. Each section is approximately 1 meter high, and adjacent sections are connected by flange bolts. By increasing the number of packing sections, the total height of the packing layer can be increased, while maintaining a predetermined spacing between the spray layer and the uppermost packing layer. A sight glass can be installed on one of the packing sections to facilitate observation of the distribution and actual flow of seawater within the packing material.

[0027] The packed tower 11 has a flue gas inlet below the packing section. The outlet of the mixing unit is connected to the flue gas inlet through a first pipe 27, which sends simulated flue gas into the tower. A first pressure gauge 8 and a first thermometer 9 are respectively installed on the first pipe 27 to monitor the flue gas pressure and temperature at the flue gas inlet of the packed tower 11. A gas flow meter 13 is installed on the packed tower 11 to measure the flow rate of the simulated flue gas in the tower, which can be converted to obtain the actual flow velocity of the simulated flue gas in the tower. The packed tower 11 has a spray port above the packing section. The outlet of the variable frequency pump 20 is connected to the spray port through a pipe to send simulated seawater into the tower, and the spray assembly installed in the tower sprays seawater onto the packing below.

[0028] The flue gas analyzer 10 is an online analytical device based on an electrochemical sensor, used to continuously measure the sulfur dioxide concentration in flue gas. A first branch pipe 29 extends from the flue gas inlet of the first pipe 27 near the packed tower 11, and connects to the flue gas inlet of the flue gas analyzer 10 via a first valve 28. A second pipe 30 extends from the flue gas outlet at the top of the packed tower 11, and is sequentially equipped with a second thermometer 32, a second pressure gauge 31, and a second valve 33, and connects to the flue gas inlet of the flue gas analyzer 10. The second thermometer 32 and the second pressure gauge 31 are used to monitor the flue gas pressure and temperature at the flue gas outlet of the packed tower 11, respectively. By switching the opening and closing states of the first valve 28 and the second valve 33, the sample source of the flue gas analyzer 10 can be switched to either the flue gas inlet or the flue gas outlet, enabling continuous monitoring of the sulfur dioxide concentration at either the flue gas inlet or outlet of the packed tower 11.

[0029] By monitoring the sulfur dioxide concentration at the flue gas inlet and outlet of packed tower 11, the effective desulfurization efficiency of the corresponding packing material under corresponding operating conditions can be calculated. By monitoring the flue gas pressure at the flue gas inlet and outlet of packed tower 11, the pressure drop change of the corresponding packing material under corresponding operating conditions can be calculated.

[0030] The seawater desulfurization packing performance evaluation system provided in this application embodiment can simulate the flue gas desulfurization environment of real seawater, accurately reproduce process parameters within the range of real seawater quality and flue gas operating conditions, and acquire raw data such as desulfurization efficiency and pressure drop characteristics online. This provides a reliable data foundation for studying the law of multi-factor coupling influence, evaluating packing performance, and optimizing engineering design, and solves the problem that existing laboratory evaluation methods lack comprehensive basis for packing selection and are difficult to optimize in engineering applications.

[0031] In some embodiments, see Figure 1 The sulfur dioxide gas supply unit includes a sulfur dioxide gas cylinder 3, a pressure reducing valve 4, and a float flow meter 5 connected in sequence. The outlet of the float flow meter 5 is connected to the inlet of the mixing unit.

[0032] Specifically, the sulfur dioxide cylinder 3 stores high-pressure sulfur dioxide, and the cylinder valve outlet is connected to the mixing unit via a pressure reducing valve 4 and a float flow meter 5. When the cylinder valve of the sulfur dioxide cylinder 3 is opened, the sulfur dioxide gas is depressurized by the pressure reducing valve 4 and stabilized at the preset pressure. Then, the flow rate is continuously adjusted by the float flow meter 5 to achieve precise and stable control of the SO2 content in the simulated flue gas.

[0033] In some embodiments, see Figure 1 The mixing unit includes a mixer 6 and a gas heater 7. The inlet of the mixer 6 is connected to the sulfur dioxide gas supply unit, the variable frequency fan 2 and the diesel generator 1. The outlet of the mixer 6 is connected to the inlet of the gas heater 7. The outlet of the gas heater 7 is connected to the flue gas inlet of the packed tower 11 through the first pipe 27.

[0034] Specifically, the exhaust outlet of the diesel generator 1, the outlet of the variable frequency fan 2, and the outlet of the float flowmeter 5 are all connected to the inlet of the mixer 6. This allows diesel exhaust, clean air, and sulfur dioxide to be transported to the mixer 6 for uniform mixing to form simulated exhaust gas. The mixed simulated exhaust gas is then heated to a preset temperature by the gas heater 7 and transported to the packed tower 11 through the first pipe 27, thereby achieving temperature regulation of the simulated exhaust gas. The mixer 6 can be a commercially available static mixer, pipeline mixer, or mixing tank with baffles. The gas heater 7 can be a mature product such as an electric heating tube or a shell-and-tube heat exchanger. The two can also be combined into a skid-mounted structure according to process requirements, and the specific form is not limited.

[0035] In some embodiments, see Figure 1 The water supply device also includes a stirrer 21 and a dosing pump 22. The stirrer 21 is located inside the seawater pool 26, and the outlet of the dosing pump 22 is connected to the seawater pool 26. A seawater heater 23 is installed inside the seawater pool 26.

[0036] Accordingly, by setting up a dosing pump 22, a certain amount of hydrogen chloride or sodium bicarbonate can be added to the seawater tank 26. The agitator 21 then stirs the seawater to be sprayed in the tank 26 to ensure thorough mixing of the chemicals, thereby adjusting the alkalinity and pH of the seawater. A seawater heater 23 is installed to heat the seawater to be sprayed in the tank 26, thus regulating the temperature of the seawater.

[0037] In some embodiments, see Figure 1 The water supply device also includes a sampling tank 17, which is connected to the seawater pool 26 through a pipe equipped with a third valve 34. The sampling tank 17 is equipped with a third thermometer 35 and a first pH meter 24.

[0038] During the adjustment of alkalinity, pH, and temperature of the seawater to be sprayed in the seawater tank 26, the third valve 34 can be opened to allow the seawater to flow into the sampling tank 17 by gravity or static pressure for sampling. After sampling, the third valve 34 is closed. The temperature and pH of the sample in the sampling tank 17 are monitored by the third thermometer 35 and the first pH meter 24, respectively, and the alkalinity is measured simultaneously. If any indicator deviates from the set value, the dosing pump 22 is started to add reagents, while the seawater heater 23 circulates and heats the water. The above steps are repeated until all indicators meet the set values. Only seawater that meets the requirements in the seawater tank 26 can be transported to the packed tower 11 by the frequency converter pump 20 to ensure that the parameters of each batch of seawater to be sprayed entering the tower are reproduced.

[0039] In some embodiments, see Figure 1 The water supply device also includes an electric ball valve 19 and an electromagnetic flow meter 18 installed on the pipeline between the variable frequency pump 20 and the packed tower 11.

[0040] Correspondingly, when the variable frequency pump 20 is used to transport the seawater to be sprayed in the seawater pool 26 to the packed tower 11, a simple and reliable regulating unit can also be formed by the electric ball valve 19 and the electromagnetic flow meter 18. The electromagnetic flow meter 18 displays the actual flow rate online, and the operator or automatic control system can steplessly adjust the opening of the electric ball valve 19 accordingly. The interface smoothly changes the seawater spray volume to meet the liquid-gas ratio requirements of different working conditions.

[0041] In some embodiments, see Figure 1 The seawater outlet of the packed tower 11 is connected to the aeration tank 15 via a centrifugal pump 25, and the aeration tank 15 is also connected to the outlet of the aeration blower 14. A second pH meter 36 is installed on the pipeline between the seawater outlet of the packed tower 11 and the centrifugal pump 25.

[0042] Correspondingly, a second pH meter 36 is installed to monitor the pH value of the seawater after flue gas desulfurization. By comparing the pH value with that of the seawater to be sprayed in the seawater pool 26, the trend of pH change before and after desulfurization can be clearly understood. A centrifugal pump 25 is installed to transport the desulfurized seawater to the aeration tank 15. Air is injected into the aeration tank 15 using an aeration blower 14, thereby raising the pH value of the seawater in the aeration tank 15 to the discharge standard before it is discharged into the discharge channel 16.

[0043] See Figure 1 This application also provides an evaluation method using a seawater desulfurization packing performance evaluation system, comprising the following steps: S1. Fill the packing material 12 to be tested into the packed tower 11 and record the height of the packing material 12 to be tested.

[0044] Specifically, the height of the packed tower 11 is set according to the set height of the packing material 12 to be tested, and the packing material 12 to be tested is filled into it at the set height. The packing height is denoted as H.

[0045] S2. Store the seawater to be sprayed in seawater tank 26 and record the alkalinity, temperature and pH value of the seawater to be sprayed.

[0046] Specifically, seawater is stored in seawater tank 26, and a certain amount of hydrogen chloride or sodium bicarbonate is added to the seawater through dosing pump 22. The seawater is heated by seawater heater 23 to pre-treat the seawater in seawater tank 26. During the pre-treatment process, the alkalinity, temperature and pH of the seawater to be sprayed in seawater tank 26 are repeatedly sampled to sampling tank 17 until the set requirements are met, and recorded as ALK, T1 and pH1 respectively.

[0047] S3. Start the gas supply device, close the first valve 28, open the second valve 33, and record the flue gas pressure, flue gas temperature and flue gas flow rate at the flue gas inlet of the packed tower 11; then open the first valve 28 and close the second valve 33, and record the sulfur dioxide concentration at the flue gas inlet of the packed tower 11.

[0048] Specifically, start the diesel generator 1, the variable frequency fan 2, and the sulfur dioxide cylinder 3. First, close the first valve 28 and open the second valve 33. Observe the gas flow meter 13, and adjust the load of the diesel generator 1 and the frequency of the variable frequency fan 2 to make the flue gas flow meet the set requirements, denoted as Q. 气 The flue gas is heated using gas heater 7 until the temperature meets the set requirement, denoted as T2. The flue gas inlet pressure is measured and denoted as P1. Then, the first valve 28 is opened and the second valve 33 is closed. The sulfur dioxide concentration in the flue gas is measured in real time by flue gas analyzer 10. The opening of float flowmeter 5 is adjusted to ensure that the sulfur dioxide concentration in the flue gas meets the set requirement, denoted as C1.

[0049] S4. Close the first valve 28, open the second valve 33, start the water supply device, record the spray volume at the spray port of the packed tower 11, and record the sulfur dioxide concentration, flue gas pressure and flue gas temperature at the flue gas outlet of the packed tower 11.

[0050] Specifically, start the variable frequency pump 20, observe the electromagnetic flowmeter 18, and adjust the frequency of the variable frequency pump 20 and the opening of the electric ball valve 19 to ensure that the spray volume meets the set requirements, denoted as Q. 液 Liquid-to-gas ratio = Q 液 / Q 气 The sulfur dioxide concentration in the desulfurized flue gas is measured in real time by the flue gas analyzer 10 and recorded as C2. The pressure and temperature of the desulfurized flue gas are measured in real time by the second pressure gauge 31 and the second temperature gauge 32 and recorded as P2 and T3, respectively.

[0051] The formula for calculating desulfurization efficiency is: Desulfurization efficiency = (C2 - C1) / C1. The formula for calculating system pressure drop is: Pressure drop = P2 - P1.

[0052] The present application provides a method for evaluating the performance of seawater desulfurization packing material, which can simulate the flue gas desulfurization environment of real seawater, accurately reproduce process parameters within the range of real seawater quality and flue gas operating conditions, and acquire raw data such as desulfurization efficiency and pressure drop characteristics online, providing a reliable data foundation for studying the law of multi-factor coupling influence, evaluating packing material performance, and optimizing engineering design.

[0053] Example 1: The set height of the test packing material 12 is 5 meters, the set alkalinity of the seawater to be sprayed is 2.4 mmol / L, the set temperature is 30 ℃, and the set spray volume of the seawater to be sprayed is 7.75 m. 3 / h, the simulated flue gas set flow rate is 645m³ / h. 3 / h, set temperature 100℃, set sulfur dioxide concentration 2000 mg / Nm 3 The set liquid-to-gas ratio is 12L / m³. 3 .

[0054] S1. Fill the packed tower 11 with conjugate ring packing of a set height.

[0055] S2. Natural seawater is injected into the seawater tank 26. A certain amount of hydrogen chloride or sodium bicarbonate is added to the seawater tank 26 through the dosing pump 22, and the stirrer 21 is started to stir to adjust the alkalinity of the seawater. The seawater is heated by the seawater heater 23 to adjust the temperature of the seawater. During this process, the seawater in the seawater tank 26 is sampled multiple times through the sampling tank 17. The alkalinity and temperature of the seawater in the sampling tank 17 are measured using the first pH meter 24 and the third thermometer 35 until the alkalinity and temperature of the seawater to be sprayed in the seawater tank 26 reach the set values.

[0056] S3. Start the diesel generator 1, variable frequency fan 2, and sulfur dioxide cylinder 3. Close the first valve 28 and open the second valve 33. Adjust the load of the diesel generator 1 and the frequency of the variable frequency fan 2 until the flue gas flow rate reaches the set value. Use the gas heater 7 to heat the flue gas and maintain the flue gas temperature at the set value. Open the first valve 28 and close the second valve 33. Monitor the sulfur dioxide concentration in the flue gas using the flue gas analyzer 10 and adjust the opening of the float flowmeter 5 until the set concentration of sulfur dioxide in the flue gas reaches the set value. Monitor the flue gas pressure and temperature at the flue gas inlet of the packed tower 11 in real time using the first pressure gauge 8 and the first thermometer 9, respectively.

[0057] S4. Close the first valve 28, open the second valve 33, start the variable frequency pump 20, and adjust the frequency of the variable frequency pump 20 and the opening of the electric ball valve 19 to make the spray volume reach the set value.

[0058] Then, a desulfurization test is conducted. During this process, the concentration of sulfur dioxide in the flue gas after desulfurization is monitored in real time by the flue gas analyzer 10, and the pressure and temperature of the flue gas after desulfurization are monitored in real time by the second pressure gauge 31 and the second temperature gauge 32, respectively.

[0059] Record the following data every three minutes: flue gas temperature, flue gas pressure, sulfur dioxide concentration, flue gas flow rate, and spray volume at the flue gas inlet of packed tower 11, and flue gas temperature, flue gas pressure, and sulfur dioxide concentration at the flue gas outlet of packed tower 11; calculate the desulfurization efficiency and pressure difference based on the recorded data.

[0060] S5. The pH of the desulfurized seawater is tested and recorded using the second pH meter 36. The desulfurized seawater is then transported to the aeration tank 15 using the centrifugal pump 25. When the seawater in the aeration tank 15 is stored to 2 / 3 of its total volume, the aeration blower 14 is started. After aeration for 15 minutes, the seawater in the aeration tank 15 is discharged to the discharge channel 16.

[0061] The data recorded in Example 1 are shown in Tables 1 and 2.

[0062] Table 1 Performance Evaluation Plan for Seawater Desulfurization Packing

[0063] Table 2 Performance Evaluation Record of Seawater Desulfurization Packing Material

[0064] The method described in this application is simple to operate, the testing process is stable, the measurement error of key parameters is less than 2%, and the experimental data has good repeatability. It provides accurate and reliable theoretical basis and practical guidance for the research, optimization and engineering application of packing materials.

[0065] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A performance evaluation system for seawater desulfurization packing material, comprising an air supply device, a water supply device, a packing tower (11), and a flue gas analyzer (10). Its features are, The gas supply device includes a mixing unit, a sulfur dioxide gas supply unit connected to the inlet of the mixing unit, a variable frequency fan (2), and a diesel generator (1); the water supply device includes a variable frequency pump (20) and a seawater pool (26) connected to the inlet of the variable frequency pump (20). The flue gas inlet of the packed tower (11) is connected to the outlet of the mixing unit through the first pipe (27). The first pipe (27) is equipped with a first pressure gauge (8) and a first thermometer (9). The first pipe (27) is connected to the flue gas analyzer (10) through a first branch pipe (29) equipped with a first valve (28). The packed tower (11) is equipped with a gas flow meter (13). The flue gas outlet of the packed tower (11) is connected to the flue gas analyzer (10) through a second pipe (30). The second pipe (30) is equipped with a second pressure gauge (31), a second thermometer (32), and a second valve (33). The spray port of the packed tower (11) is connected to the outlet of the variable frequency pump (20).

2. The performance evaluation system for seawater desulfurization packing material according to claim 1, characterized in that, The sulfur dioxide gas supply unit includes a sulfur dioxide gas cylinder (3), a pressure reducing valve (4), and a float flow meter (5) connected in sequence. The outlet of the float flow meter (5) is connected to the inlet of the mixing unit.

3. The performance evaluation system for seawater desulfurization packing material according to claim 1 or 2, characterized in that, The mixing unit includes a mixer (6) and a gas heater (7); the inlet of the mixer (6) is connected to the sulfur dioxide gas supply unit, the variable frequency fan (2) and the diesel generator (1), the outlet of the mixer (6) is connected to the inlet of the gas heater (7), and the outlet of the gas heater (7) is connected to the flue gas inlet of the packed tower (11) through the first pipe (27).

4. The performance evaluation system for seawater desulfurization packing material according to claim 1 or 2, characterized in that, The water supply device also includes a stirrer (21) and a dosing pump (22). The stirrer (21) is located in the seawater pool (26), and the outlet of the dosing pump (22) is connected to the seawater pool (26).

5. The performance evaluation system for seawater desulfurization packing material according to claim 4, characterized in that, The seawater pool (26) is equipped with a seawater heater (23).

6. The performance evaluation system for seawater desulfurization packing material according to claim 5, characterized in that, The water supply device also includes a sampling tank (17), which is connected to the seawater pool (26) through a pipe equipped with a third valve (34). The sampling tank (17) is equipped with a third thermometer (35) and a first pH meter (24).

7. The performance evaluation system for seawater desulfurization packing material according to claim 1, characterized in that, The water supply device also includes an electric ball valve (19) and an electromagnetic flow meter (18) installed on the pipeline between the variable frequency pump (20) and the packing tower (11).

8. The performance evaluation system for seawater desulfurization packing material according to claim 1, characterized in that, The seawater outlet of the packing tower (11) is connected to the aeration tank (15) via a centrifugal pump (25), and the aeration tank (15) is also connected to the outlet of the aeration blower (14).

9. The performance evaluation system for seawater desulfurization packing material according to claim 8, characterized in that, A second pH meter (36) is installed on the pipeline between the seawater outlet of the packed tower (11) and the centrifugal pump (25).

10. A method for evaluating the performance of seawater desulfurization packing material, characterized in that, The seawater desulfurization packing performance evaluation system according to any one of claims 1 to 9 is used; the method includes: The test packing material (12) is filled into the packing tower (11), and the height of the test packing material (12) is recorded; the seawater to be sprayed is stored in the seawater tank (26), and the alkalinity, temperature and pH value of the seawater to be sprayed are recorded. Start the gas supply device, close the first valve (28), open the second valve (33), and record the flue gas pressure, flue gas temperature and flue gas flow rate at the flue gas inlet of the packed tower (11); then open the first valve (28), close the second valve (33), and record the sulfur dioxide concentration at the flue gas inlet of the packed tower (11). Close the first valve (28), open the second valve (33), start the water supply device, record the spray volume at the spray port of the packed tower (11), and record the sulfur dioxide concentration, flue gas pressure and flue gas temperature at the flue gas outlet of the packed tower (11).

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