A pulping apparatus and method for wet desulphurization

Abstract

The present application provides a kind of pulping device and method for wet desulfurization, belong to energy-saving and environmental protection technical field, utilize the inner cavity of pulping box body is divided into pre-mixing chamber and mixing chamber by baffle with hole, in pre-mixing chamber, by setting the injection position and pressure of water inlet, make suspended limestone powder and water rotate and form limestone pre-slurry, that is, complete the preliminary mixing of suspended limestone powder and water;Then limestone pre-slurry passes through the through hole on the baffle and enters the mixing chamber, and the stirrer at the bottom of the mixing chamber is used to fully stir the limestone pre-slurry, and fully mixed limestone slurry is obtained.The present application combines the stirrer and slurry tank in the prior art into one, simplifies the pulping step and makes the structure of the pulping device more compact;The stirrer is arranged at the bottom of the pulping box body, the length of the connecting shaft of the stirrer is shortened, and the failure rate of the stirrer is reduced, and the service life of the pulping equipment is improved.

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, and the limestone powder is transported to the limestone powder bin by using a sealed tank truck, then 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 into a pulp preparation device to form limestone slurry, and the limestone slurry is transported to a desulfurization device by using a centrifugal slurry pump for flue gas desulfurization. The pulp preparation device includes a stirrer and a slurry tank. The limestone slurry with a solid concentration of about 20% to 30% is obtained by using the above-mentioned pulp preparation device. The existing technology has the following disadvantages:

[0003] 1) The pulp preparation device needs to increase the water pressure of the water injected into the limestone slurry tank to 0.6 MPa to 1.1 MPa in order to realize the purpose of flushing the equipment and pipelines with water; however, a throttle orifice plate needs to be arranged on the slurry tank to prevent the water pressure from impacting the liquid level of the limestone slurry, resulting in a loss of water pressure; 2) The stirrer located at the top of the slurry tank needs to be continuously operated for a long time, resulting in a high failure rate of the pulp preparation device.

[0004] Therefore, there is an urgent need for a pulp preparation device and method for wet desulfurization with high pulp preparation efficiency. 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 includes a cylindrical pulp preparation tank body, a partition plate arranged in the pulp preparation tank body, and the partition plate divides the pulp preparation tank body into a pre-stirring chamber and a stirring chamber in communication; the stirring chamber is located below the pre-stirring chamber.

[0007] A water injection unit is arranged in the pre-stirring chamber for injecting water into the pulp preparation tank body to drive the suspended limestone powder and water in the pulp preparation tank body to rotate and form limestone pre-slurry; the water injection unit includes at least one water inlet arranged on the tangent line of the cylinder wall of the pulp preparation tank body.

[0008] A stirring unit is arranged in the stirring chamber for fully mixing the limestone pre-slurry to form limestone slurry; the stirring unit includes a stirrer arranged at the bottom of the pulp preparation tank body.

[0009] A through hole is arranged on the partition plate, and the limestone pre-slurry passes through the through hole from the pre-stirring chamber to the stirring chamber.

[0010] Further, preferably, the water injection unit comprises two water inlets; the two water inlets are centrally symmetrically arranged along the central axis of the pulp box body, and the water inlets are oppositely directed.

[0011] Further, preferably, the bottom of the pulp box body is conical.

[0012] Further, preferably, the rotation direction of the stirrer is opposite to the rotation direction of the limestone pre-slurry in the pre-stirring chamber.

[0013] Further, preferably, the water inlet is provided with a water inlet nozzle, and the water inlet nozzle comprises a tapered portion and a straight portion; wherein, the diameter of the tapered portion gradually decreases along the direction close to the pulp box body, and the straight portion is arranged at the end of the tapered portion close to the pulp box body.

[0014] Further, preferably, the top of the pulp box body is provided with a limestone powder inlet, and the bottom of the pulp box body is provided with a discharge port and a blowdown port.

[0015] Further, preferably, the top of the pulp box body is provided with a gas vent.

[0016] Further, preferably, the sidewall of the pre-stirring chamber is provided with an overflow port.

[0017] The present application also protects a pulp preparation method for wet desulfurization, the method comprising,

[0018] Water enters the pre-stirring chamber of the cylindrical pulp box body through the water injection unit, and drives the suspended limestone powder and water in the pulp box body to rotate to form a limestone pre-slurry; wherein, the water injection unit comprises at least one water inlet arranged on the tangent of the cylinder wall of the pulp box body;

[0019] 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 pulp box body;

[0020] The limestone pre-slurry is fully mixed to form a limestone slurry by the stirring unit arranged in the stirring chamber, and the stirring unit is a stirrer arranged at the bottom of the pulp box body.

[0021] Further, preferably, 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.

[0022] As described above, the pulp preparation device and method for wet desulfurization of the present application utilizes a perforated partition to separate the inner cavity of the pulp preparation tank into a pre-mixing chamber and a mixing chamber, and through the setting of the injection position and pressure of the water inlet, the limestone powder and water are rotated to form limestone pre-slurry, i.e. the preliminary mixing of the limestone powder and water is completed; then the limestone pre-slurry passes through the through hole on the partition into the mixing chamber, and the pre-slurry is fully mixed by the mixer at the bottom of the mixing chamber to obtain fully mixed limestone slurry. The present application has the following beneficial effects: 1) the pulp preparation device and method for wet desulfurization of the present application combines the mixer and the slurry tank in the prior art into one, simplifying the pulp preparation step and making the structure of the pulp preparation device more compact; 2) through the setting of the injection position and pressure of the water inlet, the limestone powder and water are rotated to form limestone pre-slurry, which not only avoids the situation of water impacting the liquid surface of the limestone slurry and the loss of water pressure, but also utilizes the water inlet angle and pressure to make the limestone pre-slurry rotate along the inner wall of the cylindrical pulp preparation tank to complete the preliminary mixing, thereby improving the pulp preparation efficiency; 3) the mixer is arranged at the bottom of the pulp preparation tank, which shortens the length of the connecting shaft of the mixer, thereby reducing the failure rate of the mixer and prolonging the service life of the pulp preparation device. BRIEF DESCRIPTION OF DRAWINGS

[0023] Other objects and results of the present application will become more apparent and easily understood with reference to the following description and claims in conjunction with the accompanying drawings, and with the more complete understanding of the present application. In the drawings:

[0024] Figure 1 is a structural schematic diagram of a pulp preparation device for wet desulfurization according to an embodiment of the present application;

[0025] Figure 2 is an application scenario diagram of a pulp preparation device for wet desulfurization according to an embodiment of the present application;

[0026] Figure 3 is a structural schematic diagram of a water inlet according to an embodiment of the present application;

[0027] Figure 4 is a structural schematic diagram of the connection between the water inlet and the nozzle according to an embodiment of the present application;

[0028] Figure 5 is a structural schematic diagram of a partition according to an embodiment of the present application;

[0029] Figure 6 is a structural schematic diagram of a partition support beam according to an embodiment of the present application.

[0030] Figure 7 is a flow schematic diagram of a pulp preparation method for wet desulfurization according to an embodiment of the present application.

[0031] In the figure: 1, limestone powder inlet; 2, water inlet; 3, discharge outlet; 4, sampling port; 5, overflow port; 6, air release port; 7, blowdown port; 8, partition; 9, partition support beam; 10, agitator; 11, agitator drive; 12, pulp preparation tank; 13, water inlet nozzle; 131, tapered portion; 132, straight portion. DETAILED DESCRIPTION

[0032] In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It is apparent, however, that the embodiments 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.

[0033] 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, which are 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.

[0034] 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 connection 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.

[0035] Example 1

[0036] In the following, various embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0037] Figures 1-6 The structure of a pulp preparation device and method for wet desulfurization is specifically described. Specifically, Figure 1 is a structural schematic diagram of a pulp preparation device and method for wet desulfurization according to an embodiment of the present application. Figure 2 is an application scenario diagram of a pulp preparation device for wet desulfurization according to an embodiment of the present application; Figure 3 is a structural schematic diagram of a water inlet according to an embodiment of the present application; Figure 4 is a structural schematic diagram of a water inlet connected with a nozzle according to an embodiment of the present application; Figure 5 is a structural schematic diagram of a partition according to an embodiment of the present application;Figure 6 is a structural schematic diagram of a partition support beam according to an embodiment of the present application.

[0038] As shown in Figure 1 and Figure 2 The present application provides a pulping device for wet desulfurization, which comprises a cylindrical pulping box 12, a partition 8 arranged in the pulping box 12, the partition 8 divides the pulping box 12 into a pre-mixing chamber and a mixing chamber which are in communication; the mixing chamber is below the pre-mixing chamber; a water injection unit for injecting water into the pulping box 12 and rotating the suspended limestone powder and water in the pulping box 12 to form limestone pre-slurry is arranged in the pre-mixing chamber; the water injection unit comprises at least one water inlet 2 arranged on a tangent line of the barrel wall of the pulping box 12; a mixing unit for fully mixing the limestone pre-slurry to form limestone slurry is arranged in the mixing chamber; the mixing unit comprises a stirrer 10 arranged at the bottom of the pulping box 12; a through hole is arranged on the partition 8, and the limestone pre-slurry passes through the through hole from the pre-mixing chamber to the mixing chamber. A limestone powder inlet 1 is arranged at the top of the pulping box 12, and a discharge outlet 3 and a blowdown outlet 7 are arranged at the bottom of the pulping box 12. An air release port 6 is arranged at the top of the pulping box. An overflow port 5 is arranged on the side wall of the pre-mixing chamber. At least one sampling port 4 is arranged on the side wall of the mixing chamber.

[0039] Specifically, the pulping box 12 is divided into a pre-mixing chamber and a mixing chamber by the partition 8 with holes, the suspended limestone powder and water are rotated to form limestone pre-slurry in the pre-mixing chamber by the injection position and pressure of the water inlet 2, 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 8 into the mixing chamber, and the limestone pre-slurry is fully stirred by the stirrer at the bottom of the mixing chamber to obtain fully mixed limestone slurry. The pulping device and method for wet desulfurization of the present application combines the stirrer and the slurry tank in the prior art into one, simplifies the pulping step and makes the structure of the pulping device more compact; the suspended limestone powder and water are rotated to form limestone pre-slurry by the injection position and pressure of the water inlet 2, which not only avoids the situation that water impacts the liquid level of the limestone slurry and avoids the loss of water pressure; moreover, the injection angle and pressure are used to make the limestone pre-slurry rotate along the inner wall of the cylindrical pulping box and complete the pre-mixing, which improves the pulping efficiency; the stirrer is arranged at the bottom of the pulping box, which shortens the length of the connecting shaft of the stirrer and further reduces the failure rate of the stirrer, thereby prolonging the service life of the pulping equipment.

[0040] 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 premix slurry in the pre-mixing chamber, and the greater the power to drive the limestone premix 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 premix 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 2; the two water inlets 2 are centrally symmetrically arranged along the central axis of the pulp box, and the water inlet direction of the two water inlets 2 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 premix slurry in the pre-mixing chamber can be realized in the case of setting a small number of water inlets; a nozzle is arranged at the water inlet. The water inlet nozzle 13 includes a tapered portion 131 and a straight portion 132; wherein the diameter of the tapered portion gradually decreases in the direction close to the pulp box 12, and the straight portion is arranged at one end of the tapered portion close to the pulp box 12. 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 131 and the straight portion 132.

[0041] Specifically, in the pre-mixing chamber, the jet position and pressure of the water inlet 2 are arranged to make the suspended limestone powder and water rotate to form a limestone premix slurry, that is, to complete the preliminary mixing of the suspended limestone powder and water; then the limestone premix slurry passes through the through hole on the partition plate 8 into the stirring chamber, and the limestone premix 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 premix 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 conditions, the operation is stable, the operation is simple, the space layout is convenient; under the same rated processing capacity conditions, the output of the stirrer is small.

[0042] 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 sludge in the pulp mixing tank. In order to improve the cleaning efficiency of the pulp tank, the bottom of the pulp tank 12 is provided with a conical shape. That is, the bottom is inclined with the height on the periphery and the low in the middle, and the inclination gradient is between 15% and 25%.

[0043] As shown in Figure 1 When the bottom of the pulp tank is conical, the stirrer is arranged at the lowest center of the pulp tank, and the stirring unit includes a stirrer 10 arranged at the bottom of the pulp tank 12 and a stirrer driving device 11 arranged outside the pulp tank 12. In this embodiment, the stirrer driving device 11 includes a speed reducer and a power device. By arranging the stirrer 10 at the conical bottom of the pulp tank 12, the original traditional top stirrer is replaced by a bottom stirrer, which avoids the problem of long shaft of the original top stirrer, reduces the work of double helix pulp tank sludge, and is beneficial to the bottom discharge, so that the material conveying pipeline is 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.

[0044] As shown in Figure 5 and Figure 6 The baffle 8 is provided with through holes, and the limestone pre-slurry passes through the through holes from the pre-mixing chamber to the mixing chamber. The through holes are uniformly arranged on the baffle 8, 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 to the mixing chamber in the actual application scene. If the limestone pre-slurry needs to stay in the pre-mixing chamber for a long time, the diameter of the through hole needs to be reduced and the number 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 hole needs to be increased and the number needs to be increased.

[0045] The baffle 8 with through holes can be fixed in the pulp tank 12 by a plurality of baffle support beams 9. The baffle 8 divides the pulp tank 12 into the pre-mixing chamber and the mixing chamber in communication; the mixing chamber is located below the pre-mixing chamber. That is, in the present application, the baffle 8 with through holes not only can play the role of the orifice plate to prevent the impact of high water pressure on the liquid level of the limestone slurry; and the baffle as the bottom of the pre-mixing chamber makes the limestone pre-slurry stay in the pre-mixing chamber for a short time and rotate and mix.

[0046] Figure 7 A flow chart of a pulp mixing method for wet desulfurization is shown in the present application; as Figure 7As shown, the present application also protects a pulping method for wet desulfurization, the method comprising, S110, water enters the pre-mixing chamber of the cylindrical pulping box 12 through the injection water unit, driving the suspended limestone powder and water in the pulping box 12 to rotate to form limestone pre-slurry; wherein the injection water unit comprises at least one water inlet 2 arranged on the tangent line of the barrel wall of the pulping box; S120, the limestone pre-slurry enters the mixing chamber arranged below the pre-mixing chamber through the through hole arranged on the partition plate 8 in the pulping box 12; S130, the limestone pre-slurry is fully mixed by the stirring unit arranged in the mixing chamber to form limestone slurry, and the stirring unit is the stirrer 10 arranged at the bottom of the pulping box 12.

[0047] As an improvement of the present embodiment, the rotation direction of the limestone pre-slurry in the pre-mixing chamber is opposite to the stirring direction of the limestone slurry in the mixing 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.

[0048] In summary, the pulping device and method for wet desulfurization of the present application utilize the hole partition plate to separate the inner cavity of the pulping box into a pre-mixing chamber and a mixing chamber. In the pre-mixing chamber, the injection position and pressure of the water inlet are arranged to make the suspended limestone powder and water rotate to form limestone pre-slurry, that is, to complete the preliminary mixing of the suspended limestone powder and water. Then the limestone pre-slurry enters the mixing chamber through the through hole on the partition plate, and the stirrer at the bottom of the mixing chamber fully stirs the limestone pre-slurry to obtain fully mixed limestone slurry. The present application has the following beneficial effects: 1) The pulping device and method for wet desulfurization of the present application combine the stirrer and slurry tank in the prior art into one, simplifying the pulping step and making the structure of the pulping device more compact; 2) By arranging the injection position and pressure of the water inlet, the suspended limestone powder and water are rotated to form limestone pre-slurry, which not only avoids the situation of water impacting 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 pulping box to complete the pre-mixing, improving the pulping efficiency; 3) The stirrer is arranged at the bottom of the pulping box, shortening 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.

[0049] However, those skilled in the art should understand that various improvements can be made to the above-mentioned pulping device and method for wet desulfurization of the present application without departing from the content of the present application. Therefore, the protection scope of the present application should be determined by the content of the appended claims.

Claims

1. A pulping method for wet desulphurization, characterized in that, Comprising, Water enters the pre-mixing chamber of the cylindrical pulp box through the water injection unit, driving the suspended limestone powder and water in the pulp box to rotate and form limestone pre-slurry; wherein the water injection unit includes at least one water inlet arranged on the tangent line of the barrel wall of the pulp box; the density and diameter of the through holes are set according to the required flow rate of the limestone pre-slurry from the pre-mixing chamber into the mixing chamber; The limestone pre-slurry enters the mixing chamber arranged below the pre-mixing chamber through the through holes arranged on the partition plate in the pulp box; The limestone pre-slurry is fully mixed by the stirring unit arranged in the mixing chamber to form limestone slurry, and the stirring unit is a stirrer arranged at the bottom of the pulp box; wherein the rotation direction of the limestone pre-slurry in the pre-mixing chamber is opposite to the stirring direction of the limestone slurry in the mixing chamber.

2. A pulp preparation device for wet desulphurization, characterized in that The pulp box for wet desulfurization according to claim 1 comprises a cylindrical pulp box, a partition plate arranged in the pulp box, and the partition plate divides the pulp box into a pre-mixing chamber and a mixing chamber in communication; the mixing chamber is located below the pre-mixing chamber; an overflow port is arranged on the side wall of the pre-mixing chamber; A water injection unit is arranged in the pre-mixing chamber for injecting water into the pulp box and driving the suspended limestone powder and water in the pulp box to rotate and form limestone pre-slurry; the water injection unit includes at least one water inlet arranged on the tangent line of the barrel wall of the pulp box; A stirring unit is arranged in the mixing chamber for fully mixing the limestone pre-slurry to form limestone slurry; the stirring unit includes a stirrer arranged at the bottom of the pulp box; wherein the rotation direction of the stirrer is opposite to the rotation direction of the limestone pre-slurry in the pre-mixing chamber. Through holes are arranged on the partition plate, and the limestone pre-slurry enters the mixing chamber from the pre-mixing chamber through the through holes; the density and diameter of the through holes are set according to the required flow rate of the limestone pre-slurry from the pre-mixing chamber into the mixing chamber.

3. The pulp device for wet desulfurization according to claim 2, wherein The water injection unit includes two water inlets; the two water inlets are centrally symmetrically arranged along the central axis of the pulp box, and the water inlet directions of the two water inlets are opposite.

4. The pulp device for wet desulfurization according to claim 2, wherein The bottom of the pulp box is conical.

5. A pulp preparation device for wet desulphurization according to claim 2, characterized in that A water inlet nozzle is arranged at the water inlet, and the water inlet nozzle includes a tapered portion and a straight portion; wherein the diameter of the tapered portion gradually decreases along the direction close to the pulp box, and the straight portion is arranged at one end of the tapered portion close to the pulp box.

6. A pulp preparation device for wet desulphurization according to claim 2, characterized in that In addition, a limestone powder inlet is arranged at the top of the pulp box, and a discharge port and a blowdown port are arranged at the bottom of the pulp box.

7. A pulp preparation device for wet desulphurization according to claim 2, characterized in that In addition, a gas vent is arranged at the top of the pulp box.

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