A pulping apparatus and method for wet desulphurization

Abstract

The application provides a pulping device and method for wet desulfurization, and belongs to the technical field of energy saving and environmental protection. The limestone powder bin, the feeder and the pulping stirring device are vertically arranged from top to bottom, so that the equipment floor space is reduced, the feeding path between each link is shortened, the cost is reduced, and the energy consumption is lowered. The powder quality is ensured by shortening the feeding path, and the secondary dust raising caused by powder leakage is eliminated. The stirrer is arranged at the bottom of the pulping box body, the length of the connecting shaft of the stirrer is shortened, the failure rate of the stirrer is lowered, and the service life of the pulping device is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy saving and environmental protection, in particular to a pulp preparation device and method for wet desulfurization. BACKGROUND

[0002] The domestic thermal power, steel and other industries generally use limestone-gypsum wet method for flue gas desulfurization; specifically, limestone powder needs to be self-made or purchased, the limestone powder is transported to the limestone powder bin by using a sealed tank truck, the air compressor of the sealed tank truck is started to transport the limestone powder in the sealed tank truck to the limestone powder bin, then the limestone powder in the limestone powder bin is input to the pulp preparation and stirring equipment through the belt feeder to form limestone slurry, and the limestone slurry is transported to the desulfurization device by using the slurry pump for flue gas desulfurization. The existing technology has the following disadvantages:

[0003] 1) The series of pulp preparation equipment such as the limestone powder bin, the belt feeder, the pulp preparation and stirring equipment and the slurry pump occupies a large area and has a long feeding path, resulting in high cost and energy consumption; 2) The long feeding path causes the powder to be easily blocked by moisture absorption, and there is the disadvantage of powder leakage causing secondary dust raising.

[0004] Therefore, there is an urgent need for an environmentally friendly and efficient pulp preparation device and method for wet desulfurization. SUMMARY

[0005] The present application aims to provide a pulp preparation device and method for wet desulfurization to solve at least one disadvantage in the prior art.

[0006] A pulp preparation device for wet desulfurization comprises a limestone powder bin, a screw type weighing feeder and a stirring and pulp preparation device arranged in sequence from top to bottom;

[0007] A powder bin discharge port is arranged at the bottom of the limestone powder bin, and an electric gate valve is arranged between the powder bin discharge port and the screw type weighing feeder; a star feeder is arranged between the electric gate valve and the screw type weighing feeder; the stirring and pulp preparation device comprises a pulp preparation box body and a stirrer arranged at the bottom of the pulp preparation box body;

[0008] The limestone powder is fed from the powder bin discharge port to the star feeder through the electric gate valve, and then fed from the star feeder to the pulp preparation box body through the screw type weighing feeder, and then stirred by the stirrer to form limestone slurry.

[0009] Further, preferably, the powder bin discharge port comprises a first discharge port and a second discharge port; the first discharge port is connected with the electric gate valve; and the second discharge port is used for cleaning the limestone powder bin.

[0010] Further, preferably, a first slurry output channel and a second slurry output channel for outputting the limestone slurry are arranged at the bottom of the slurry preparation tank, and the limestone slurry reaches the neutralization tank for wet desulfurization through the first slurry output channel and the second slurry output channel.

[0011] Further, preferably, a lime milk dosing pump is arranged on each of the first slurry output channel and the second slurry output channel.

[0012] Further, preferably, the bottom of the slurry preparation tank is conical.

[0013] Further, preferably, a bag-type dust collector is arranged at the top of the limestone powder bin.

[0014] Further, preferably, the bottom of the limestone powder bin is conical.

[0015] Further, preferably, at least one gasification plate is arranged on the limestone powder bin.

[0016] Further, preferably, the gasification plate is arranged at the conical bottom of the limestone powder bin.

[0017] The present application also protects a slurry preparation method for wet desulfurization, which comprises,

[0018] The limestone powder material passes through the electric plug valve from the bottom of the limestone powder bin to the star feeder;

[0019] The limestone powder material passes through the screw type weighing feeder to the slurry preparation tank of the stirring slurry preparation device; wherein the limestone powder bin, the screw type weighing feeder and the stirring slurry preparation device are arranged in sequence from top to bottom;

[0020] In the slurry preparation tank, the limestone powder material is stirred uniformly by the stirrer arranged at the bottom of the slurry preparation tank to form the limestone slurry.

[0021] As described above, the pulp preparation device and method for wet desulfurization of the present application, the limestone powder is from the bottom of the limestone powder bin provided with a powder bin discharge port through the electric plug-in valve into the star feeder; from the feeder through the spiral weighing feeder into the stirring pulp preparation device of the pulp preparation box; wherein, the limestone powder bin, the spiral weighing feeder and the stirring pulp preparation device are sequentially arranged from top to bottom; in the pulp preparation box, the limestone powder is uniformly stirred by the stirrer arranged at the bottom of the pulp preparation box to form limestone slurry. The beneficial effects are as follows: 1) the pulp preparation device and method for wet desulfurization of the present application, the limestone powder bin, the feeder and the pulp preparation stirring equipment are vertically arranged from top to bottom, which reduces the equipment floor area, shortens the feeding path between each link, and further reduces the cost and energy consumption; 2) the shortening of the feeding path ensures the quality of the powder and eliminates the secondary dust caused by powder leakage; 3) the stirrer is arranged at the bottom of the pulp preparation box, which shortens the length of the connecting shaft of the stirrer, thereby reducing the failure rate of the stirrer and prolonging the service life of the pulp preparation equipment. BRIEF DESCRIPTION OF DRAWINGS

[0022] Other objects and results of the present application will be more apparent and easily understood through the following description in conjunction with the accompanying drawings and claims, and with a more comprehensive understanding of the present application. In the drawings:

[0023] Figure 1 is a structural schematic view of a pulp preparation device for wet desulfurization according to an embodiment of the present application;

[0024] Figure 2 is still another structural schematic view of a pulp preparation device for wet desulfurization according to an embodiment of the present application;

[0025] Figure 3 is a structural schematic view of a water inlet of a pulp preparation stirring device according to an embodiment of the present application;

[0026] Figure 4 is a structural schematic view of a water inlet of a pulp preparation stirring device according to an embodiment of the present application;

[0027] Figure 5 is a flow schematic view of a pulp preparation method for wet desulfurization according to an embodiment of the present application.

[0028] In the drawings: 1, limestone powder bin; 2, bag-type dust collector; 3, gasification plate; 4, feed inlet; 5, electric plug-in valve; 6, star feeder; 7, spiral weighing feeder; 8, stirring pulp preparation device; 9, lime milk dosing pump; 81, pulp preparation device feed inlet; 82, water inlet; 83, pulp preparation box; 84, stirrer; 85, stirrer driving device; 86, water inlet nozzle; 861, tapered portion; 862, straight portion. DETAILED DESCRIPTION

[0029] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It can be evident, however, that such embodiment(s) can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0030] It needs to be understood that the terms "horizontal", "vertical", "upper", "lower", "top", "middle", "length", "inner", "bottom" and the like indicate the orientation or positional relationship, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] Unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Embodiment 1

[0033] In the following, various embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0034] Figure 1 And Figure 2 The structure of a pulping device and method for wet desulfurization is specifically described. Specifically, Figure 1 The structure of a pulping device and method for wet desulfurization is specifically described. Specifically, Figure 2 The structure of a pulping device and method for wet desulfurization is specifically described. Specifically,

[0035] As Figure 1 And Figure 2As shown, the present application provides a pulp preparation device for wet desulfurization, which comprises a limestone powder bin 1, a spiral weighing feeder 7 and a stirring pulp preparation device 8 arranged in sequence from top to bottom; a powder bin discharge port is arranged at the bottom of the limestone powder bin 1, and an electric plug-in valve 5 is arranged between the powder bin discharge port and the spiral weighing feeder 7; a star feeder 6 is arranged between the electric plug-in valve 5 and the spiral weighing feeder 7; the stirring pulp preparation device 8 comprises a pulp preparation box body 83 and a stirrer 84 arranged at the bottom of the pulp preparation box body 83; the limestone powder material enters the star feeder 6 from the powder bin discharge port through the electric plug-in valve 5, and enters the pulp preparation box body 83 from the star feeder 6 through the spiral weighing feeder 7 to form limestone slurry by stirring with the stirrer 84. A feed inlet 4 is arranged at the top of the limestone powder bin 1. In the specific implementation process, in order to improve the environmental protection effect of the pulp preparation process, a bag dust collector 2 is arranged at the top of the limestone powder bin 1. By arranging the star feeder 6 between the electric plug-in valve 5 and the spiral weighing feeder 7, specifically, when a large amount of powder in the limestone powder bin 1 enters the spiral weighing feeder 7 at the same time, not only the accuracy of weighing will be affected, but also the spiral weighing feeder 7 will be easily blocked. That is, a large amount of powder can be dispersed by the star feeder 6 first and then gradually enter the spiral weighing feeder 7.

[0036] The pulp preparation device for wet desulfurization of the present application vertically arranges the limestone powder bin 1, the spiral weighing feeder 7 and the pulp preparation stirring device 8 from top to bottom, reduces the overall land occupation area of the pulp preparation equipment, shortens the feeding path between each link, and further reduces the cost and energy consumption; the shortened feeding path ensures the quality of the powder material, and eliminates the secondary dust caused by powder leakage; arranging the stirrer at the bottom of the pulp preparation box body shortens the length of the connecting shaft of the stirrer, and further reduces the failure rate of the stirrer, and improves the service life of the pulp preparation equipment.

[0037] In one specific embodiment, the discharge port of the limestone powder bin 1 is arranged in one working and one standby mode. The bottom of the limestone powder bin 1 is provided with a discharge port, and the discharge port is connected with other components of the pulp preparation device below through two branch discharge channels, i.e., a first discharge port and a second discharge port, and a distribution valve is connected between the first discharge port and the second discharge port and the discharge port of the limestone powder bin. By arranging the first discharge port and the second discharge port of the limestone powder bin 1, if one of the discharge ports of the two discharge channels fails, the other discharge port can be started to avoid interruption of the supply of limestone powder material to other components of the pulp preparation device below. In this embodiment, the first discharge port is connected with the electric plug-in valve 5; and the second discharge port is used for cleaning the limestone powder bin.

[0038] Specifically, the purchased limestone powder is transported by tank truck, and is unloaded by tank truck pneumatic conveying. The powder enters and is stored in the limestone powder bin 1. There are two branches at the bottom of the limestone powder bin 1, so that there are two feeding ports (i.e., a first discharge port and a second discharge port) in one and one spare. The first discharge port is connected with an electric plug-in valve 5, and the electric plug-in valve 5 is connected with a rotary feeder (star feeder). The star feeder feeds and controls the feeding amount by a metering system (screw type weighing feeder 7). The screw type weighing feeder 7 is connected with a discharging pipe, and the discharging pipe is connected into a pulping box body 83. The powder falls into the conical pulping box body, mixes with water, and is fully dissolved to form a suspension, so as to complete the pulping process. In order to make the lime powder and water fully mixed and dissolved, a bottom agitator is arranged in the pulping tank, which can ensure uniform mixing of the slurry. After the pulping is completed, a centrifugal slurry pump is used to transport the lime milk solution to the neutralization tank for wet desulfurization.

[0039] In one specific embodiment, as shown in Figure 1 , a first slurry output channel and a second slurry output channel for outputting the limestone slurry are arranged at the bottom of the pulping box body 83. The limestone slurry passes through the first slurry output channel and the second slurry output channel to reach the neutralization tank for wet desulfurization. A lime milk dosing pump 9 is arranged on each of the first slurry output channel and the second slurry output channel.

[0040] In one specific embodiment, as shown in Figure 2 , the bottom of the limestone powder bin 1 is conical, specifically a conical bottom. At least one aeration plate 3 is arranged on the limestone powder bin 1. The aeration plate 3 is arranged at the conical bottom of the limestone powder bin 1. However, in order to ensure the flowability of the powder in the limestone powder bin 1 and prevent caking, a plurality of aeration plates 3 are uniformly arranged around the discharge port. Compressed air is introduced through the aeration plate 3, so that the powder at the place is in a suspended state, and the flowability is enhanced.

[0041] Figure 3 is a structure diagram of a water inlet of a pulping and stirring device according to an embodiment of the present application; Figure 4 is a structure diagram of a water inlet connected with a nozzle of a pulping and stirring device according to an embodiment of the present application. As Figure 3 and Figure 4As shown, the cylindrical pulp box 83 is provided with a partition plate (not shown in the figure) in the pulp box 83, which divides the pulp box 83 into a pre-mixing chamber and a mixing chamber in communication; the mixing chamber is below the pre-mixing chamber; a water injection unit for injecting water into the pulp box 83 and rotating the suspended limestone powder and water in the pulp box 83 to form limestone pre-slurry is arranged in the pre-mixing chamber; the water injection unit includes at least one water inlet 82 arranged on the tangent of the cylinder wall of the pulp box 83; a stirring unit for fully mixing the limestone pre-slurry to form limestone slurry is arranged in the mixing chamber; the stirring unit includes a stirrer 84 arranged at the bottom of the pulp box 83; a through hole is arranged on the partition plate, and the limestone pre-slurry passes through the through hole from the pre-mixing chamber to the mixing chamber. A pulp device feed inlet 81 is opened at the top of the pulp box 83, and a discharge outlet and a blowdown outlet are arranged at the bottom of the pulp box 83. A gas discharge port is opened at the top of the pulp box 83. An overflow port is arranged on the side wall of the pre-mixing chamber. At least one sampling port is opened on the side wall of the mixing chamber.

[0042] In the specific implementation process, the pulp box 83 is divided into a pre-mixing chamber and a mixing chamber by a partition plate with holes, the injection position and pressure of the water inlet 82 are arranged in the pre-mixing chamber, so that the suspended limestone powder and water are rotated to form limestone pre-slurry, that is, the preliminary mixing of the suspended limestone powder and water is completed; then the limestone pre-slurry passes through the through hole on the partition plate into the mixing chamber, and the stirrer at the bottom of the mixing chamber fully stirs the limestone pre-slurry to obtain fully mixed limestone slurry. The pulp device and method for wet desulfurization of the present application combine the stirrer and the slurry tank in the prior art into one, simplifying the pulp preparation step and making the structure of the pulp device more compact; by arranging the injection position and pressure of the water inlet 82, the suspended limestone powder and water are rotated to form limestone pre-slurry, which not only avoids the situation that water impacts the liquid level of the limestone slurry and avoids the loss of water pressure; moreover, by using the water inlet angle and pressure, the limestone pre-slurry rotates along the inner wall of the cylindrical pulp box to complete the pre-mixing, improving the pulp preparation efficiency; the stirrer is arranged at the bottom of the pulp box, which shortens the length of the connecting shaft of the stirrer, thereby reducing the failure rate of the stirrer and prolonging the service life of the pulp preparation equipment.

[0043] It should be noted that the number of water inlets can be 1-8; the water required in the actual application scene and the water pressure are determined, which is not specifically limited. Among them, in the case of determining the jet water pressure of each water inlet, the more the water inlets, the greater the force of the limestone pre-slurry in the pre-mixing chamber, and the greater the power to drive the limestone pre-slurry to rotate. Specifically, in the scene of providing multiple water inlets on the pulp box, the water inlets need to be evenly arranged, and the direction of the limestone pre-slurry rotation caused by the water inlet must be consistent, otherwise it will cause the loss of water inlet pressure, and then reduce the pulp efficiency. In a specific embodiment, as shown in Figure 3 and Figure 4 The jet water inlet unit includes two water inlets 82; the two water inlets 82 are centrally symmetrically arranged along the central axis of the pulp box 83, and the water inlet direction of the two water inlets 82 is opposite. As an improvement of this embodiment, in order to further increase the jet pressure of the water inlet, the rotation of the limestone pre-slurry in the pre-mixing chamber can be realized in the case of arranging a small number of water inlets; the water inlet nozzle 86 is arranged at the water inlet 82. The water inlet nozzle 86 includes a tapered portion 861 and a straight portion 132; wherein the diameter of the tapered portion gradually decreases along the direction close to the pulp box 83, and the straight portion is arranged at one end of the tapered portion close to the pulp box 83. Specifically, according to Bernoulli's principle, along the direction of the water flow, the diameter of the tapered portion decreases, the pressure will decrease, and the axial flow rate will increase. The orientation of the nozzle device utilizes the momentum generated by the change in the direction of the fluid at the location of the nozzle device. This effect is more obvious at the connection between the tapered portion 861 and the straight portion 862.

[0044] Specifically, in the pre-mixing chamber, the jet position and pressure of the water inlet 82 are arranged to make the suspended limestone powder and water rotate to form a limestone pre-slurry, that is, to complete the preliminary mixing of the suspended limestone powder and water; then the limestone pre-slurry passes through the through hole on the partition plate into the stirring chamber, and the limestone pre-slurry is fully stirred by the stirrer at the bottom of the stirring chamber to obtain fully mixed limestone slurry. That is, in the present application, there are two stirring actions, one stirring power is the jet pressure of the water inlet, and the other stirring power is provided by the stirrer at the bottom. In a specific embodiment, in order to further improve the stirring efficiency of the limestone slurry, the rotating direction of the stirrer is opposite to the rotating direction of the limestone pre-slurry in the pre-mixing chamber. That is, the stirring and pulping device of the present application not only provides two stirring opportunities, but also the two stirrings are in different rotating directions, thereby further improving the pulping efficiency of the stirring and pulping device. Under the same rated processing capacity, the operation is stable, the operation is simple, the space arrangement is convenient; under the same rated processing capacity, the output of the stirrer is small.

[0045] In the specific implementation process, the bottom of the pulp mixing tank in the prior art is flat, and it is very time-consuming and laborious to clean the pulp mixing tank during the blowdown cleaning process. In order to improve the cleaning efficiency of the pulp tank, the bottom of the pulp tank 83 is provided in a conical shape. That is, the bottom is inclined with the periphery being higher and the middle being lower, and the inclination gradient is between 15% and 25%.

[0046] As shown in Figure 1 and Figure 2 , when the bottom of the pulp tank is conical, the stirrer is arranged at the lowest point in the center of the pulp tank, and the stirring unit includes a stirrer 84 arranged at the bottom of the pulp tank 83 and a stirrer driving device 85 arranged outside the pulp tank 83. In this embodiment, the stirrer driving device 85 includes a speed reducer and a power device. By arranging the stirrer 84 at the conical bottom of the pulp tank 83, the original conventional top stirrer is replaced by a bottom stirrer installation, which also avoids the problem of the long shaft of the original top stirrer, reduces the work of the double-spiral pulp tank sludge, and is beneficial to the bottom discharge, making the material conveying pipeline smooth. In addition, the bottom stirrer has the characteristics of short stirrer shaft, low installation requirement, easy maintenance and long service life. In addition, the speed reducer and the power device are placed on the ground foundation, which is beneficial to the maintenance of these devices.

[0047] In a specific embodiment, the partition plate is provided with through holes, and the limestone pre-slurry passes through the through holes from the pre-mixing chamber into the mixing chamber. The through holes are uniformly arranged on the partition plate, and the density and diameter of the through holes are determined according to the required flow rate of the limestone pre-slurry from the pre-mixing chamber into the mixing chamber in the actual application scenario. If the limestone pre-slurry needs to stay in the pre-mixing chamber for a long time, the diameter of the through holes needs to be reduced and the number of the through holes needs to be reduced. Similarly, if the limestone pre-slurry needs to stay in the pre-mixing chamber for a short time, the diameter of the through holes needs to be increased and the number of the through holes needs to be increased. The partition plate with through holes can be fixed in the pulp tank by a plurality of partition plate support beams. The partition plate divides the pulp tank 83 into the pre-mixing chamber and the mixing chamber in communication; the mixing chamber is located below the pre-mixing chamber. That is, the partition plate with through holes in the present application not only plays the role of the orifice plate that prevents the water pressure from impacting the liquid level of the limestone slurry; moreover, the partition plate as the bottom of the pre-mixing chamber makes the limestone pre-slurry stay and rotate in the pre-mixing chamber for a short time.

[0048] Figure 5 A flow chart of a pulp mixing method for wet desulfurization is shown in the present application; as Figure 5As shown, the present application also protects a pulping method for wet desulfurization, the method comprising, S110, limestone powder material from the bottom of the limestone powder bin is provided with a powder bin discharge port through the electric plug valve into the star feeder; S120, from the feeder through the spiral weighing feeder into the pulping box of the stirring pulping device; wherein, the limestone powder bin, the spiral weighing feeder and the stirring pulping device are sequentially arranged from top to bottom; S130, in the pulping box, the limestone powder material is uniformly stirred by the stirrer arranged at the bottom of the pulping box to form limestone slurry.

[0049] Specifically, the stirring pulping process inside the pulping box comprises the following steps: water enters the pre-stirring chamber of the cylindrical pulping box 83 through the water injection unit, driving the suspended limestone powder and water in the pulping box 83 to rotate to form limestone pre-slurry; wherein, the water injection unit comprises at least one water inlet 82 arranged on the tangent line of the barrel wall of the pulping box; the limestone pre-slurry enters the stirring chamber arranged below the pre-stirring chamber through the through hole arranged on the partition plate in the pulping box 83; the limestone pre-slurry is fully mixed by the stirring unit arranged in the stirring chamber to form limestone slurry, and the stirring unit is a stirrer 84 arranged at the bottom of the pulping box 83. As an improvement of this embodiment, the rotation direction of the limestone pre-slurry in the pre-stirring chamber is opposite to the stirring direction of the limestone slurry in the stirring chamber. The pulping method for wet desulfurization of the present application is realized by the pulping device for wet desulfurization of the present application. For specific implementation details, refer to the pulping device for wet desulfurization of the present application, which will not be described here.

[0050] In summary, the pulping device and method for wet desulfurization of the present application, limestone powder material from the bottom of the limestone powder bin is provided with a powder bin discharge port through the electric plug valve into the star feeder; from the feeder through the spiral weighing feeder into the pulping box of the stirring pulping device; wherein, the limestone powder bin, the spiral weighing feeder and the stirring pulping device are sequentially arranged from top to bottom; in the pulping box, the limestone powder material is uniformly stirred by the stirrer arranged at the bottom of the pulping box to form limestone slurry. The pulping device and method for wet desulfurization of the present application, the limestone powder bin, the feeder and the pulping stirring equipment are vertically arranged from top to bottom, which reduces the equipment floor area, shortens the feeding path between each link, and further reduces the cost and energy consumption; the shortening of the feeding path ensures the quality of the powder material and eliminates the secondary dust caused by powder leakage; the stirrer is arranged at the bottom of the pulping box, which shortens the length of the connecting shaft of the stirrer, thereby reducing the failure rate of the stirrer and prolonging the service life of the pulping equipment.

[0051] However, those skilled in the art shall appreciate that the pulping device and method for wet desulfurization provided by the present application can be improved in various manners without departing from the content of the present application. Therefore, the protection scope of the present application shall be determined by the content of the appended claims.

Claims

1. A pulp preparation device for wet desulphurization, characterized in that The limestone powder bin, the spiral type weighing feeder and the stirring slurry preparation device are sequentially arranged from top to bottom. A powder bin discharge port is arranged at the bottom of the limestone powder bin, and an electric plug valve is arranged between the powder bin discharge port and the spiral type weighing feeder; a star feeder is arranged between the electric plug valve and the spiral type weighing feeder; the stirring slurry preparation device comprises a slurry preparation box body and a stirrer arranged at the bottom of the slurry preparation box body; the slurry preparation box body is divided into a pre-stirring chamber and a stirring chamber by a partition plate with holes; a water inlet is arranged on the tangent line of the cylinder wall of the pre-stirring chamber, and a stirrer is arranged at the bottom of the stirring chamber. The limestone powder material enters the star feeder through the electric plug valve from the powder bin discharge port, and enters the slurry preparation box body of the stirring slurry preparation device through the spiral type weighing feeder from the star feeder, and is stirred by the stirrer to form limestone slurry.

2. The slurry preparation device for wet desulfurization according to claim 1, wherein the powder bin discharge port comprises a first discharge port and a second discharge port; the first discharge port is connected with the electric plug valve; and the second discharge port is used for cleaning the limestone powder bin.

3. The slurry preparation device for wet desulfurization according to claim 1, wherein a first slurry output channel and a second slurry output channel for outputting limestone slurry are arranged at the bottom of the slurry preparation box body; and the limestone slurry reaches a neutralizing tank for wet desulfurization through the first slurry output channel and the second slurry output channel.

4. The slurry preparation device for wet desulfurization according to claim 1, wherein a lime milk dosing pump is arranged on each of the first slurry output channel and the second slurry output channel. The bottom of the slurry preparation box body is conical. A bag-type dust collector is arranged at the top of the limestone powder bin. The bottom of the limestone powder bin is conical.

5. A pulp preparation device for wet desulphurization according to claim 1, characterized in that The limestone powder bin is provided with at least one gasification plate.

6. A pulp preparation device for wet desulphurization according to claim 1, characterized in that The gasification plate is arranged at the conical bottom of the limestone powder bin.

7. A pulp preparation device for wet desulphurization according to claim 1, characterized in that The limestone powder bin, the spiral type weighing feeder and the stirring slurry preparation device are sequentially arranged from top to bottom. The limestone powder material enters the star feeder through the electric plug valve from the powder bin discharge port; 8. A pulp preparation device for wet desulphurization according to claim 7, characterized in that The limestone powder material enters the slurry preparation box body of the stirring slurry preparation device through the spiral type weighing feeder from the star feeder; wherein the limestone powder bin, the spiral type weighing feeder and the stirring slurry preparation device are sequentially arranged from top to bottom; the slurry preparation box body is divided into a pre-stirring chamber and a stirring chamber by a partition plate with holes; a water inlet is arranged on the tangent line of the cylinder wall of the pre-stirring chamber, and a stirrer is arranged at the bottom of the stirring chamber; In the slurry preparation box body, the limestone powder material is stirred uniformly by the stirrer arranged at the bottom of the slurry preparation box body to form limestone slurry.

9. A pulp preparation device for wet desulphurization according to claim 8, characterized in that ​ ​ 10. A pulping process for wet desulphurization, characterized by ​ ​ ​ ​

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