Wet desulphurization system using papermaking white mud as desulfurizer and use method thereof

Abstract

The invention provides a wet desulphurization system using papermaking white mud as a desulfurizing agent and a using method thereof.The wet desulphurization system comprises a white mud dissolving tank, a white mud slurry conveying pump, a white mud dissolving pump and a desulfurizing tower, a stirrer is arranged in the white mud dissolving tank, and suction inlets of the white mud slurry conveying pump and the white mud dissolving pump are both formed in the white mud dissolving tank; the white mud slurry conveying pump and the white mud dissolving pump are respectively connected with the white mud operation control center, the operation state is adjusted through the white mud operation control center, and the white mud slurry conveying pump is connected with the desulfurizing tower through a white mud slurry supplementing point. Under the condition that limestone is completely replaced, the long-term stable emission of SO2 in the flue gas reaches the ultra-low emission standard can be ensured. Meanwhile, the problems of corrosion prevention, scaling prevention, deposition prevention and the like of equipment in white mud desulfurization are mainly solved, automatic control logic is provided, the operation stability and safety of a desulfurization system are improved, the operation cost is reduced, and economic benefits and environmental benefits are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wet desulfurization, and in particular to a wet desulfurization system using papermaking white mud as a desulfurizer and a use method thereof. Background Art

[0002] The widespread use of coal-fired boilers in the industrial and power sectors has led to a large amount of sulfur dioxide (SO2) emissions. In order to reduce SO2 emissions, the limestone-gypsum wet desulfurization process has become the mainstream process for flue gas desulfurization of coal-fired boilers due to its high desulfurization efficiency, mature technology, and wide application range. However, this process relies heavily on limestone as a desulfurizer, which not only requires the mining and consumption of a large amount of limestone resources, causing damage to the ecological environment, but also causes the desulfurization cost to continue to rise, increasing the economic pressure on power plants and related enterprises.

[0003] At the same time, the papermaking industry produces a large amount of white mud every year. This is a solid waste, the main component of which is calcium carbonate (CaCO3), with a content of more than 90%, which is very similar to the composition of limestone. Traditional treatment methods are mainly through stacking or landfilling, which leads to resource waste and potential environmental pollution. In recent years, studies have found that white mud has high reactivity and desulfurization efficiency, and can be used as a substitute for limestone in wet desulfurization processes. It can not only effectively reduce the cost of desulfurizers, but also realize waste resource utilization and reduce secondary pollution.

[0004] In the prior art, the white mud-limestone flue gas wet desulfurization method (such as patent CN105214471A) stipulates the mixing ratio of white mud and limestone slurry and some operating parameters. The volume fraction of white mud in the slurry is 10% to 50%, and the liquid-gas ratio is 1 to 30 L / Nm 3 , the flue gas velocity is 1 to 10 m / s, and the by-product after desulfurization is gypsum. However, this technology has the following shortcomings: it fails to combine the requirements of the current ultra-low emission standards or the more stringent emission standards in some parts of the country. The design and parameters of the desulfurization system fail to fully meet the current more stringent sulfur dioxide emission limits, affecting the long-term operation effect. The application ratio of white mud is limited, and the amount of white mud does not exceed 50%. The white mud resources are not fully utilized, and the economic efficiency is not optimal. There is a lack of detailed control of the key operating parameters of the white mud desulfurization process, such as slurry density, pH value, and sulfur dioxide concentration at the outlet of the absorption tower. Targeted automatic control logic has not been proposed, resulting in system operation relying on manual labor, and poor operating safety and stability. The equipment corrosion, scaling and deposition problems in the process of white mud desulfurization have not been fully considered, and there is a lack of preventive measures, which may have an adverse effect on the long-term operation of the equipment. The degree of automation is low, and it cannot meet the requirements of modern desulfurization systems for automation and intelligent operation. Summary of the invention

[0005] The purpose of the present invention is to provide a wet desulfurization system using papermaking lime mud as a desulfurizer and a method of using the system. Using lime mud as the main desulfurizer in wet desulfurization can completely replace limestone and ensure that SO2 emissions in flue gas can reach ultra-low emission standards in the long term.

[0006] According to one object of the present invention, the present invention provides a wet desulfurization system using papermaking white mud as a desulfurizer, comprising a white mud dissolution tank, a white mud slurry delivery pump, a white mud dissolution pump and a desulfurization tower, wherein an agitator is provided in the white mud dissolution tank, and the suction ports of the white mud slurry delivery pump and the white mud dissolution pump are both arranged in the white mud dissolution tank, the white mud slurry delivery pump and the white mud dissolution pump are respectively connected to a white mud operation control center, and the operation status is adjusted by the white mud operation control center, the white mud slurry delivery pump is connected to the desulfurization tower through a white mud slurry replenishing point, and supplies white mud slurry to the desulfurization tower.

[0007] Furthermore, the inner wall of the lime mud dissolving pool is protected against corrosion by glass flakes, and the pool opening of the lime mud dissolving pool is covered by a grating plate.

[0008] Furthermore, when the liquid level of the white mud dissolution tank reaches 1.0 meter, the agitator automatically starts, and when the liquid level drops to 0.8 meter, the agitator automatically stops.

[0009] Furthermore, a density meter is provided in the white mud dissolution tank for monitoring the density of the white mud slurry, and the density signal is connected to the white mud operation control center, and the white mud operation control center controls the start and stop of the white mud dissolution pump according to the density value.

[0010] Furthermore, a flue gas outlet is provided at the top of the desulfurization tower, a demister and a slurry spraying layer are provided inside the desulfurization tower, and the slurry spraying layer is located below the demister.

[0011] Furthermore, a pH measuring box is provided at the bottom of the desulfurization tower, and the pH measuring box monitors the pH value of the desulfurization slurry in real time. The pH measuring box is connected to the white mud operation control center through a communication cable, and the white mud operation control center adjusts the delivery flow and pH value of the white mud slurry according to the real-time pH value.

[0012] Furthermore, the white mud operation control center is connected to the white mud slurry delivery pump, the white mud dissolution pump, the density meter and the pH measurement box through a communication cable to adjust the operation parameters of each device in real time.

[0013] Furthermore, the white mud dissolution tank, the white mud dissolution pump, the white mud slurry delivery pump, and the pipelines in the desulfurization tower are all equipped with process water flushing pipelines.

[0014] Furthermore, the number of the agitator, the lime mud slurry delivery pump and the lime mud dissolution pump are all two.

[0015] According to another object of the present invention, the present invention provides a method for using the wet desulfurization system using papermaking white mud as a desulfurization agent, comprising the following steps:

[0016] S1, the white mud dissolution tank receives white mud through the white mud unloading truck, the white mud is dissolved by process water and mixed with the water in the white mud dissolution tank to form white mud slurry for desulfurization;

[0017] S2, when the density is stable at 1140kg / m 3 -1160kg / m 3 The mud operation control center receives the signal from the density meter, controls the mud dissolving pump to stop, and automatically uses process water to flush the pipeline, mud dissolving pump, and density meter;

[0018] S3, when the SO2 concentration at the desulfurization outlet is greater than 16-28 mg / m 3 At this time (if local environmental protection requirements are stricter than national environmental protection requirements, they can be adjusted according to actual needs), the white mud operation control center receives the SO2 concentration signal at the desulfurization outlet, starts the white mud slurry delivery pump, and adjusts the operation frequency of the white mud slurry delivery pump to reduce the SO2 concentration at the desulfurization outlet to 10-20mg / m 3 Hours (if local environmental protection requirements are stricter than national environmental protection requirements, they can be adjusted according to actual needs);

[0019] S4. When the pH value is ≥5.5, stop the operation of the white mud slurry delivery pump;

[0020] S5. If the SO2 concentration at the desulfurization outlet is greater than 28 mg / m 3 When the pH value is ≥5.5, an alarm is given and the operator is advised to stop the white mud slurry delivery pump and start the standby slurry circulation pump.

[0021] The technical solution of the present invention can ensure that SO2 emissions in flue gas reach ultra-low emission standards in a long-term and stable manner while completely replacing limestone. At the same time, the present invention focuses on solving the problems of equipment corrosion prevention, scaling prevention, and deposition prevention in white mud desulfurization, proposes automatic control logic, improves the operational stability and safety of the desulfurization system, reduces operating costs, and significantly improves economic and environmental benefits. It realizes waste treatment in the process of flue gas desulfurization of coal-fired boilers, and provides a new solution for building an industrial ecological economy between coal-fired power plants and industrial coal-fired boilers and papermaking enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0024] In the figure: 1. white mud unloading truck; 2. first agitator; 3. second agitator; 4. first white mud slurry delivery pump; 5. second white mud slurry delivery pump; 6. white mud dissolution tank cover; 7. density meter; 8. first white mud dissolution pump; 9. second white mud dissolution pump; 10. white mud dissolution tank; 11. white mud operation control center; 12. white mud slurry replenishment point; 13. communication cable; 14. process water flushing pipeline; 15. white mud slurry delivery pipeline; 16. pH measurement box. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] like Figure 1 As shown:

[0030] A wet desulfurization system using papermaking white mud as a desulfurizer comprises a white mud dissolving pool 10, the inner wall of the white mud dissolving pool 10 is anti-corrosive with glass flakes, and the pool opening of the white mud dissolving pool is covered with a grating plate to prevent people from falling or debris from entering.

[0031] The lime mud dissolution tank cover plate 6 covers the top surface of the lime mud dissolution tank 10. The first agitator 2 and the second agitator 3 are arranged in the lime mud dissolution tank 10. The first agitator 2 and the second agitator 3 help the lime mud to dissolve and prevent the lime mud from settling.

[0032] In this embodiment, two agitators are provided to help dissolve the white mud and prevent the white mud from settling. The two agitators are automatically started when the liquid level in the white mud dissolution tank reaches 1.0 m, and are stopped for protection when the liquid level drops to 0.8 m.

[0033] The suction ports of the first lime mud slurry delivery pump 4 , the second lime mud slurry delivery pump 5 , the first lime mud dissolving pump 8 and the second lime mud dissolving pump 9 are all arranged in the lime mud dissolving tank 10 .

[0034] The first white mud slurry delivery pump 4 and the second white mud slurry delivery pump 5 can be started and stopped and the frequency can be adjusted locally, and can also be started and stopped and the frequency can be adjusted through the white mud operation control center 11. The first white mud slurry delivery pump 4 and the second white mud slurry delivery pump 5 are connected to the white mud operation control center 11 through a communication cable.

[0035] The first white mud dissolving pump 8 and the second white mud dissolving pump 9 can be started and stopped locally, and can also be started and stopped by the white mud operation control center 11. The first white mud dissolving pump 8 and the second white mud dissolving pump 9 are respectively connected to the white mud operation control center 11 through communication cables.

[0036] A flue gas outlet is provided on the top of the desulfurization tower, and a demister and a slurry spray layer are provided inside the desulfurization tower and below the flue gas outlet. The slurry spray layer is located below the demister; the white mud slurry delivery pump is provided with a white mud slurry pipeline and is connected to the desulfurization tower through a white mud slurry replenishing point.

[0037] The white mud slurry replenishing point 12 is connected to the first white mud slurry delivery pump 4 and the second white mud slurry delivery pump 5 through the white mud slurry delivery pipeline 15. The white mud slurry replenishing point 12 is located on the desulfurization tower, and white mud slurry is supplied to the desulfurization tower through the first white mud slurry delivery pump 4 or the second white mud slurry delivery pump 5.

[0038] The density meter 7 is arranged on the outlet circulation pipeline of the first white mud dissolution pump 8 and the second white mud dissolution pump 9. The numerical signal of the density meter 7 is connected to the white mud operation control center 11 through a communication cable. The white mud operation control center 11 can control the operation and flushing of the first white mud dissolution pump 8 and the second white mud dissolution pump 9 by determining the density of the white mud slurry.

[0039] The pH measuring box 16 is connected to the bottom of the desulfurization tower through a pipeline, and the white mud operation control center 11 is connected to the first white mud dissolution pump 8, the second white mud dissolution pump 9, the first white mud slurry delivery pump 4, the second white mud slurry delivery pump 5, the density meter 7 and the pH measuring box 16 through a communication cable 13.

[0040] The process water is connected to the first white mud dissolution pump 8, the second white mud dissolution pump 9, the first white mud slurry delivery pump 4, the second white mud slurry delivery pump 5, the density meter 7, the pH measuring box 16 and the connected pipes through the process water flushing pipe 14. The first white mud slurry delivery pump 4, the second white mud slurry delivery pump 5, the first white mud dissolution pump 8, the second white mud dissolution pump 9, the pipes in contact with the white mud slurry, and the pH measuring box 16 are all provided with process water flushing pipes to prevent the white mud from depositing and clogging in the above equipment.

[0041] The flushing water enters the white mud dissolution tank 10 and the desulfurization tower, and the white mud enters the white mud dissolution tank 10 through the white mud unloading vehicle 1.

[0042] In this embodiment, the pipes involved in the white mud slurry should be lined with rubber pipes or pipes made of 2205 material or above to avoid or reduce chloride ion corrosion and slurry wear.

[0043] The white mud operation control center controls the dissolution and transportation flow of white mud by measuring the density of white mud slurry, the pH value of slurry in the desulfurization tower, and the SO2 concentration at the desulfurization outlet, thereby realizing the automated operation of the white mud system.

[0044] like Figure 1 As shown, the white mud enters the white mud dissolution tank 10 through the white mud unloading vehicle 1, and the dissolved water comes from the process water and enters the white mud dissolution tank 10 through the water supply pipe.

[0045] like Figure 1 As shown, the ratio of added white mud and dissolved water is set, and the process water is used to dissolve the white mud at a mass fraction of 20%. The first agitator 2 and the second agitator 3 stir and dissolve to help the white mud dissolve and prevent the white mud from settling; at the same time, the first white mud dissolving pump 8 or the second white mud dissolving pump 9 is turned on to assist in dissolution, and a density meter 7 is put into use. The density meter 7 is installed on the circulation pipeline to monitor the density of the white mud slurry.

[0046] like Figure 1 As shown in Figure 2, when the white mud is fully dissolved, the density of the white mud slurry is stable at 1140 kg / m 3 -1160kg / m 3 The mud operation control center 11 determines that the dissolution is completed through the density parameter provided by the density meter 7, and sends a pump stop request to the first mud dissolution pump 8 or the second mud dissolution pump 9, and opens the flushing water valve of the corresponding pump to flush the relevant pipelines and pumps, and finally closes the flushing water valve. This prevents the mud from depositing in the above equipment and ensures that it can be started smoothly next time.

[0047] like Figure 1 As shown in the figure, in this embodiment, the white mud slurry delivery pump is a variable frequency pump. When the SO2 concentration at the desulfurization outlet is greater than 16-28 mg / m 3 When the desulfurization outlet SO2 concentration is reduced to 10-20 mg / m 3 (If local environmental protection requirements are stricter than national environmental protection requirements, they can be adjusted according to actual needs) to ensure that sulfur dioxide emissions meet standards.

[0048] like Figure 1 As shown, during the reaction process, the white mud operation control center controls the pH value of the desulfurization slurry to 5.0-5.5 to avoid high pH operation which may cause scaling of equipment in the desulfurization tower and poor oxidation effect resulting in poor quality of the by-product gypsum.

[0049] In this embodiment, three pH meters are arranged in the pH meter measuring box 16 to measure the pH of the desulfurized slurry in real time, and transmit the three pH values ​​to the white mud operation control center 11, which obtains the intermediate pH value.

[0050] In the process of white mud desulfurization, the pH value of the desulfurization slurry should be controlled at 5.0-5.5 to avoid high pH operation which may cause scaling of equipment in the desulfurization tower and poor oxidation effect resulting in poor quality of by-product gypsum.

[0051] When the pH value is ≥5.5, the white mud operation control center 11 issues an instruction to stop the operation of the first white mud slurry delivery pump 4 or the second white mud slurry delivery pump 5 to prevent the desulfurization slurry from running at a high pH value for a long time, causing scaling of equipment in the desulfurization tower and poor oxidation effect, resulting in poor quality of by-product gypsum.

[0052] like Figure 1 As shown, if the SO2 concentration at the desulfurization outlet is greater than 28 mg / m 3 When the pH value is ≥5.5, the mud operation control center 11 issues a command to give an alarm and advises the operator to stop the mud slurry delivery pump and start the standby slurry circulation pump. After the mud slurry delivery pump is stopped, process water is used to flush the relevant pipelines and mud slurry delivery pump to prevent mud from depositing in the above equipment, ensuring smooth start-up next time.

[0053] like Figure 1 As shown, after the first white mud slurry delivery pump 4 or the second white mud slurry delivery pump 5 stops operating, the white mud operation control center 11 issues a command to open the flushing water valve of the corresponding pump to flush the relevant pipelines and pumps, and finally closes the flushing water valve to prevent the white mud from depositing in the above equipment and ensure smooth startup and operation next time.

[0054] In this embodiment, the existing desulfurization system can be directly used, and according to the supply of white mud and the adaptability of the desulfurization system, part or all of the papermaking white mud desulfurization is adopted, which greatly reduces the purchase cost of the desulfurizer and the power consumption of the wet ball mill.

[0055] The technical problem to be solved by the present invention is how to use papermaking white mud instead of limestone as a desulfurizer for wet desulfurization of coal-fired boiler flue gas, use a control center to control the dissolution of the white mud and the transportation of the white mud slurry, ensure that sulfur dioxide emissions meet the standards, and at the same time do not cause new production problems.

[0056] The present invention adopts papermaking white mud instead of limestone as a desulfurizer for a wet desulfurization system, which can not only ensure that sulfur dioxide in the flue gas of coal-fired boilers meets the emission standards, but also greatly reduce the operating cost of the desulfurization system, and achieve the purpose of treating waste with waste, and build an industrial ecological economy between coal-fired power plants and industrial coal-fired boilers and papermaking enterprises, with good economic and environmental benefits.

[0057] The present invention adopts papermaking white mud as a desulfurizing agent to partially or completely replace limestone, which can not only ensure that the sulfur dioxide in the flue gas of coal-fired boilers meets the emission standards, but also greatly reduce the operating cost of the desulfurization system, and can also achieve the purpose of treating waste with waste, and build an industrial ecological economy between coal-fired power plants and industrial coal-fired boilers and papermaking enterprises, with good economic and environmental benefits.

[0058] The processes of white mud dissolution and desulfurization of the present invention are all automatic processes, do not require human intervention, reduce manpower input, and avoid human misoperation. The white mud dissolution pump, the white mud slurry delivery pump, the pipelines in contact with the white mud slurry, the density meter, and the desulfurization slurry pH measurement box are all provided with process water flushing pipelines, which are automatically flushed after operation to avoid white mud deposition and blockage in the above equipment.

[0059] The present invention controls the pH value of the desulfurization slurry to 5.0-5.5 to avoid scaling of the equipment in the desulfurization tower and poor oxidation effect resulting in poor quality of the byproduct gypsum due to high pH operation. Pipes involved in white mud slurry should be lined with rubber pipes or 2205 material or above to avoid or slow down chloride ion corrosion and slurry wear.

[0060] The present invention can ensure that SO2 emissions in flue gas reach ultra-low emission standards in a long-term and stable manner while completely replacing limestone. At the same time, the present invention focuses on solving the problems of equipment corrosion prevention, scaling prevention, and deposition prevention in white mud desulfurization, proposes automatic control logic, improves the operational stability and safety of the desulfurization system, reduces operating costs, and significantly improves economic and environmental benefits. It realizes waste treatment in the process of flue gas desulfurization of coal-fired boilers, and provides a new solution for building an industrial ecological economy between coal-fired power plants and industrial coal-fired boilers and papermaking enterprises.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wet desulfurization system using papermaking white mud as a desulfurizing agent, characterized in that: It includes a white mud dissolution tank, a white mud slurry delivery pump, a white mud dissolution pump and a desulfurization tower. The white mud dissolution tank is provided with an agitator. The suction ports of the white mud slurry delivery pump and the white mud dissolution pump are both arranged in the white mud dissolution tank. The white mud slurry delivery pump and the white mud dissolution pump are respectively connected to a white mud operation control center, and the operation status is adjusted by the white mud operation control center. The white mud slurry delivery pump is connected to the desulfurization tower through a white mud slurry replenishing point.

2. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 1 is characterized in that: The inner wall of the white mud dissolving pool is anti-corrosive with glass flakes, and the pool opening of the white mud dissolving pool is covered with a grating plate.

3. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 1, characterized in that: When the liquid level of the white mud dissolving tank reaches 1.0 meter, the agitator starts automatically, and when the liquid level drops to 0.8 meter, the agitator stops automatically.

4. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 1, characterized in that: A densitometer is provided in the white mud dissolving tank for monitoring the density of the white mud slurry, and the density signal is connected to the white mud operation control center, and the white mud operation control center controls the start and stop of the white mud dissolving pump according to the density value.

5. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 1, characterized in that: A flue gas outlet is arranged on the top of the desulfurization tower, a demister and a slurry spraying layer are arranged inside the desulfurization tower, and the slurry spraying layer is located below the demister.

6. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 4, characterized in that: A pH measuring box is provided at the bottom of the desulfurization tower, and the pH measuring box monitors the pH value of the desulfurization slurry in real time. The pH measuring box is connected to the white mud operation control center via a communication cable, and the white mud operation control center adjusts the delivery flow and pH value of the white mud slurry according to the real-time pH value.

7. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 6, characterized in that: The white mud operation control center is connected to the white mud slurry delivery pump, the white mud dissolution pump, the density meter and the pH measurement box through a communication cable to adjust the operation parameters of each device in real time.

8. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 1, characterized in that: The white mud dissolution tank, the white mud dissolution pump, the white mud slurry delivery pump, and the pipelines in the desulfurization tower are all equipped with process water flushing pipelines.

9. The wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 1, characterized in that: The number of the agitator, the white mud slurry delivery pump and the white mud dissolving pump are all two.

10. The method for using a wet desulfurization system using papermaking white mud as a desulfurizing agent according to claim 7, characterized in that: The steps include: S1, the white mud dissolution tank receives white mud through the white mud unloading truck, the white mud is dissolved by process water and mixed with the water in the white mud dissolution tank to form white mud slurry for desulfurization; S2, when the density is stable at 1140kg / m 3 -1160kg / m 3 The mud operation control center receives the signal from the density meter, controls the mud dissolving pump to stop, and automatically uses process water to flush the pipeline, mud dissolving pump, and density meter; S3, when the SO2 concentration at the desulfurization outlet is greater than 16-28 mg / m 3 At this time, the mud operation control center receives the SO2 concentration signal at the desulfurization outlet, starts the mud slurry delivery pump, and adjusts the operation frequency of the mud slurry delivery pump to reduce the SO2 concentration at the desulfurization outlet to 10-20 mg / m 3 the following; S4. When the pH value is ≥5.5, stop the operation of the white mud slurry delivery pump; S5. If the SO2 concentration at the desulfurization outlet is greater than 28 mg / m 3 When the pH value is ≥5.5, an alarm is given and the operator is advised to stop the white mud slurry delivery pump and start the standby slurry circulation pump.

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