Wet desulphurization slurry preparation device

Abstract

The utility model provides a wet desulfurization slurry preparation device, which belongs to the technical field of flue gas desulfurization systems, and comprises a slurry preparation tank, a liquid discharge pipe and a backflow mixing system, the top of the slurry preparation tank is provided with a feed pipe and a liquid inlet pipe, and the bottom of the slurry preparation tank is provided with the liquid discharge pipe; the backflow mixing system comprises a backflow main pipe, a slurry spraying pipe and a nozzle; one end of the backflow main pipe is connected with the liquid discharging pipe, the other end of the backflow main pipe is communicated with the multiple slurry spraying pipes, the multiple slurry spraying pipes are evenly distributed in the circumferential direction of the slurry preparing tank, and the outlet ends of the slurry spraying pipes are connected with sprayers. According to the wet desulphurization slurry preparation device provided by the utility model, slurry forms an integral rotating mode at the tank bottom through the spray head, the slurry is discharged from the liquid discharge pipe, part of the slurry flows back by virtue of the backflow main pipe and the plurality of slurry spraying pipes, and the slurry is sprayed out from the spray nozzle during backflow to promote stirring and uniform mixing of the slurry; omni-directional dead-corner-free sufficient stirring of slurry in the slurrying tank is ensured, and the phenomena of blockage and cutoff of a slurry discharge port in the slurrying tank and precipitation at the bottom of the tank are eliminated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flue gas desulfurization system technical field, more specifically, relate to a kind of wet desulphurization slurry preparation device. BACKGROUND

[0002] Wet desulphurization is a common flue gas desulfurization process in environmental protection industry.In the wet desulphurization system, pulp preparation is a key link, and all industries use stirrers to stir the pulp.The specific method is that calcium carbonate is discharged from the ash bin through the star-shaped ash discharge valve and flows into the pulp preparation tank, water is added according to the required slurry density through the electric valve at the top of the pulp preparation tank, and the stirrer is used to stir uniformly to complete the pulp preparation.

[0003] At present, due to the long transmission shaft of the stirrer, the torque is large, so the size of the stirrer blade is designed in the same proportion, which reduces the stirring area in the pulp preparation tank and causes precipitation around the tank.

[0004] Because the higher the slurry density value, the faster the precipitation, the slurry density value decreases when the stirring speed is slow, the slurry density value increases when the stirring speed is fast, and the settling speed around the tank increases, which reduces the flow rate of the slurry outlet and causes blockage, increases the load of the stirrer, and causes the transmission shaft to break due to over fatigue, the blade to deform and wear seriously.Long-term operation forms a pot bottom at the bottom of the pulp preparation tank, blocks the slurry outlet, and causes problems such as empty suction of the slurry pump, inability to increase the slurry density, interruption of slurry supplement, etc., which reduces the efficiency of the absorption tower in removing sulfur dioxide, exceeds the discharge index, and takes a long time to handle the fault, which greatly restricts the continuous and normal operation of the production process. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of wet desulphurization slurry preparation device, to ensure continuous slurry supply when adjusting slurry density value at will, and eliminate the blockage of slurry outlet and the phenomenon of reagent precipitation.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a kind of wet desulphurization slurry preparation device, which includes a pulp preparation tank, a liquid discharge pipe and a reflux mixing system, the top of the pulp preparation tank has a feed pipe and a liquid inlet pipe, and the bottom of the pulp preparation tank has the liquid discharge pipe;The reflux mixing system includes a reflux main pipe, a slurry injection pipe and a spray head;One end of the reflux main pipe is connected to the liquid discharge pipe, the other end of the reflux main pipe is connected to multiple slurry injection pipes, multiple slurry injection pipes are evenly distributed along the circumference of the pulp preparation tank, and the slurry injection pipe extends into the pulp preparation tank along the radial direction of the pulp preparation tank, the outlet end of the slurry injection pipe is connected to a spray head, and the spray direction of the spray head is perpendicular to the slurry injection pipe.

[0007] As another embodiment of the present application, the backflow main pipe comprises a first pipe section and a second pipe section, the first pipe section is connected to the liquid discharge pipe, the second pipe section is connected to the outlet of the first pipe section, the second pipe section is horizontally arranged outside the pulp tank, and the second pipe section is in an arc-shaped pipe structure; the fixed ends of the plurality of jetting pipes are sequentially connected to the second pipe section.

[0008] As another embodiment of the present application, the liquid discharge pipe is provided with a slurry output pump, and the inlet of the first pipe section is connected to the downstream of the slurry output pump.

[0009] As another embodiment of the present application, the plurality of jetting pipes are located in the same plane.

[0010] As another embodiment of the present application, the outlet end of the jetting pipe is provided with a bending portion, and the outlet end of the bending portion is connected to the nozzle.

[0011] As another embodiment of the present application, the nozzle is a Venturi nozzle.

[0012] As another embodiment of the present application, the backflow mixing system further comprises a plurality of equally spaced baffles, the baffles are longitudinally arranged on the inner side wall of the pulp tank and located above the nozzles, and the width direction of the baffles is consistent with the radial direction of the pulp tank.

[0013] As another embodiment of the present application, the plurality of baffles correspond to the plurality of nozzles one by one.

[0014] As another embodiment of the present application, the upper end of the pulp tank is provided with an exhaust port.

[0015] The wet desulfurization slurry preparation device has the advantages that, compared with the prior art, the wet desulfurization slurry preparation device of the present application enables the slurry to form an overall rotation mode at the bottom of the tank through the nozzle, the slurry is discharged from the liquid discharge pipe and part of the slurry is backflowed by means of the backflow main pipe and the plurality of jetting pipes, the slurry is horizontally sprayed from the nozzle during backflowing to promote the stirring and mixing of the slurry, the slurry in the pulp tank is fully stirred in all directions without dead angle, the phenomena of blockage of the slurry discharge port in the pulp tank, flow interruption, and sedimentation at the bottom of the tank are eliminated, the desulfurization slurry supply system capacity is improved, timely and sufficient slurry supplement is ensured when the inlet sulfur dioxide concentration increases, the process operation is stabilized, and the phenomenon of excessive flue gas sulfur dioxide emission concentration due to untimely slurry supply is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0017] Figure 1 A structure schematic diagram of the wet desulfurization slurry preparation device provided by the present application is shown in the figure.

[0018] Figure 2 A cross-sectional view along Figure 1 line A-A in the figure.

[0019] Figure 3 A cross-sectional view along Figure 1 line B-B in the figure.

[0020] In the figure: 1, pulp preparation tank; 2, exhaust port; 3, feed pipe; 4, liquid inlet pipe; 5, partition; 6, reflux main pipe; 7, slurry injection pipe; 8, spray head; 9, liquid outlet pipe. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical schemes and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0022] Please refer to Figures 1 to 3 , the wet desulfurization slurry preparation device provided by the present application will be described. The wet desulfurization slurry preparation device comprises a pulp preparation tank 1, a liquid outlet pipe 9 and a reflux mixing system, the pulp preparation tank 1 has a feed pipe 3 and a liquid inlet pipe 4 at the top, and the pulp preparation tank 1 has a liquid outlet pipe 9 at the bottom; the reflux mixing system comprises a reflux main pipe 6, a slurry injection pipe 7 and a spray head 8; one end of the reflux main pipe 6 is connected to the liquid outlet pipe 9, the other end of the reflux main pipe 6 is communicated with a plurality of slurry injection pipes 7, the plurality of slurry injection pipes 7 are evenly distributed along the circumference of the pulp preparation tank 1, and the slurry injection pipe 7 extends into the pulp preparation tank 1 along the radial direction of the pulp preparation tank 1, the outlet end of the slurry injection pipe 7 is connected with the spray head 8, and the spray direction of the spray head 8 is perpendicular to the slurry injection pipe 7.

[0023] The material such as calcium carbonate is fed into the pulp preparation tank 1 through the feeding pipe 3, and water is added into the pulp preparation tank 1 through the liquid inlet pipe 4; during the mixing, the backflow mixing system in the pulp preparation tank 1 uses the backflow slurry to improve the mixing effect; that is, the output slurry in the liquid outlet pipe 9 is backfed through the backflow main pipe 6 and is delivered to the inside of the pulp preparation tank 1 through the plurality of slurry spraying pipes 7, and finally is sprayed towards the inside of the pulp preparation tank 1 through the spray head 8, the spraying direction is tangential to the radial direction of the pulp preparation tank 1, so that the slurry forms a cyclone in the pulp preparation tank 1, and the slurry is uniformly mixed.

[0024] Compared with the prior art, the wet desulfurization slurry preparation device provided by the utility model makes the slurry form an overall rotation mode at the tank bottom through the spray head 8, discharges the slurry from the liquid outlet pipe 9 and realizes the backflow of part of the slurry with the help of the backflow main pipe 6 and the plurality of slurry spraying pipes 7, the slurry is horizontally sprayed from the nozzle during the backflow to promote the stirring and uniform mixing of the slurry, ensures that the slurry in the pulp preparation tank 1 is fully stirred in all directions without dead angle, eliminates the plugging of the slurry discharge port in the pulp preparation tank 1, the flow interruption phenomenon and the tank bottom precipitation phenomenon, improves the desulfurization slurry supply system capacity, ensures that the slurry is timely and sufficiently supplemented when the inlet sulfur dioxide concentration increases, stabilizes the process operation and avoids the phenomenon that the flue gas sulfur dioxide emission concentration exceeds the standard due to the untimely slurry supply.

[0025] Optionally, the upper end of the pulp preparation tank 1 is provided with the exhaust port 2, so as to facilitate the exhaust of the pulp preparation tank 1.

[0026] The backflow mixing system can be implemented as a separate scheme or as a retrofit scheme, and the original agitator and other structures in the pulp preparation tank 1 do not need to be disassembled.

[0027] When the pulp preparation tank 1 only has the backflow mixing system, during the initial mixing stage, part of the liquid can be first put in, and the part of the liquid is completely backflowed through the liquid outlet pipe 9, and the stirring is realized by the backflow circulation. When the pulp preparation tank 1 has the backflow mixing system and the original agitator is used in cooperation, during the initial mixing stage, the original agitator can be first started, and then the backflow mixing system is started, and the slurry is stirred in cooperation.

[0028] In some possible embodiments, please refer to Figure 2 The backflow main pipe 6 includes a first pipe section and a second pipe section, the first pipe section is connected with the liquid outlet pipe 9, the second pipe section is connected with the outlet of the first pipe section, the second pipe section is horizontally arranged outside the pulp preparation tank 1, and the second pipe section is in an arc-shaped pipe structure; the fixed ends of the plurality of slurry spraying pipes 7 are sequentially connected with the second pipe section.

[0029] The first pipe section of the reflux main pipe 6 is connected to the liquid discharge pipe 9 as a branch pipe of the liquid discharge pipe 9. The first pipe section of the reflux main pipe 6 branches and returns the liquid in the liquid discharge pipe 9. The second pipe section is an annular pipe section with openings, and the starting end of the second pipe section is connected to the tail of the first pipe section. The second pipe section has a plurality of connection ports along the length direction of the second pipe section, and the connection ports are used to connect the jetting pipes 7 so that the plurality of jetting pipes 7 form parallel pipes.

[0030] The second pipe section is an annular pipe section and is in the same horizontal plane. The plurality of jetting pipes 7 connected to the second pipe section are located in the same plane. The outlet end of the jetting pipe 7 has a curved portion, and the outlet end of the curved portion is connected to the nozzle 8. The curved portion is adapted to the position of the nozzle 8 and can be a horizontally installed elbow assembly or a vertically installed elbow assembly. The nozzle 8 is a Venturi nozzle.

[0031] Optionally, the liquid discharge pipe 9 has a slurry output pump, and the inlet of the first pipe section is connected downstream of the slurry output pump. The pressure of the slurry output pump is 0.4-0.6 MPa. The first pipe section and the second pipe section of the reflux main pipe 6 can both use DN80 pipes and are connected through elbows and other parts. The jetting pipe 7 can use a DN50 pipe. The jetting pipe 7 can be selected to be three, and the three jetting pipes 7 are uniformly distributed in the circumferential direction of the slurry tank 1. The jetting pipe 7 horizontally penetrates the slurry tank 1 and the axis is 50 cm away from the position of the tank bottom. The nozzle 8 is installed at the end of the jetting pipe 7, the water outlet axis of the nozzle 8 is 40 cm away from the tank bottom, and the nozzle 8 is tangent to the tank wall surface at the position of the jetting pipe 7 connected thereto. The nozzle 8 is 20 cm away from the inner side wall of the slurry tank 1.

[0032] The nozzle 8 is a Venturi nozzle, and the pressurized slurry output by the slurry output pump drives the liquid in the slurry tank 1 to flow through the Venturi nozzle 8. The slurry in the slurry tank 1 forms a whole rotating mode at the tank bottom under the driving of the high-pressure liquid. When a certain flow rate is reached, a vortex is formed in the middle of the slurry tank 1, and a reverse cone-shaped vortex is generated.

[0033] In some possible embodiments, please refer to Figure 1 and Figure 3 The reflux mixing system further includes a plurality of equally spaced baffles 5, which are longitudinally arranged on the inner side wall of the slurry tank 1 and located above the nozzles 8. The width direction of the baffles 5 is consistent with the radial direction of the slurry tank 1.

[0034] The plurality of baffles 5 of the reflux mixing system are uniformly distributed, and the baffles 5 are longitudinally arranged above the nozzles 8. The slurry forms a vortex under the action of the nozzles 8, and a reverse resistance is formed when the vortex meets the upper baffles 5, which destroys the movement direction, forms a reaction force, and makes the slurry flow longitudinally into the middle of the tank and then back to the bottom of the tank, forming two alternating vortexes of annular and longitudinal, which are repeated to achieve the effect of uniform mixing. Optionally, the baffles 5 are located 2 m above the tank bottom of the pulp tank 1, and the top end of the baffles 5 is at least 1 m below the liquid level, so as to avoid local splashing on the upper part of the baffles 5 and greatly improve the mixing effect.

[0035] The plurality of baffles 5 correspond to the plurality of nozzles 8 one by one. The baffles 5 and the central axis of the slurry injection pipe 7 are in the same longitudinal plane.

[0036] The cooperation of the nozzles 8 and the baffles 5 eliminates the plugging, flow interruption and tank bottom sedimentation in the pulp tank 1, greatly reduces the power consumption and spare part consumption by using the original slurry pump as a power source, improves the desulfurization slurry supply system capacity, ensures timely and sufficient slurry supply when the inlet sulfur dioxide concentration increases, stabilizes the process operation, and avoids the phenomenon that the flue gas sulfur dioxide emission concentration exceeds the standard due to insufficient slurry supply.

[0037] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A wet desulfurization slurry preparation device, characterized in that, The system includes a pulping tank (1), a drain pipe (9), and a reflux mixing system. The top of the pulping tank (1) has a feed pipe (3) and a liquid inlet pipe (4), and the bottom of the pulping tank (1) has the drain pipe (9). The reflux mixing system includes a reflux main pipe (6), a spray pipe (7), and a nozzle (8). One end of the reflux main pipe (6) is connected to the drain pipe (9), and the other end of the reflux main pipe (6) is connected to a plurality of spray pipes (7). The plurality of spray pipes (7) are evenly distributed around the circumference of the pulping tank (1), and the spray pipes (7) extend into the pulping tank (1) radially. The outlet end of the spray pipe (7) is connected to a nozzle (8), and the spraying direction of the nozzle (8) is perpendicular to the spray pipe (7).

2. The wet desulfurization slurry preparation apparatus as described in claim 1, characterized in that, The reflux main pipe (6) includes a first pipe section and a second pipe section. The first pipe section is connected to the drain pipe (9), and the second pipe section is connected to the outlet of the first pipe section. The second pipe section is horizontally arranged around the outside of the slurry tank (1). The second pipe section has an arc-shaped pipe structure. The fixed ends of multiple slurry spraying pipes (7) are sequentially connected to the second pipe section.

3. The wet desulfurization slurry preparation apparatus as described in claim 2, characterized in that, The drain pipe (9) is equipped with a slurry output pump, and the inlet of the first pipe section is connected to the downstream of the slurry output pump.

4. The wet desulfurization slurry preparation apparatus as described in claim 1, characterized in that, All of the aforementioned spray pipes (7) are located on the same plane.

5. The wet desulfurization slurry preparation apparatus as described in claim 1, characterized in that, The outlet end of the shotcrete pipe (7) has a bend, and the outlet end of the bend is connected to the nozzle (8).

6. The wet desulfurization slurry preparation apparatus as described in claim 1, characterized in that, The nozzle (8) is a Venturi nozzle (8).

7. The wet desulfurization slurry preparation apparatus as described in claim 1, characterized in that, The reflux mixing system also includes a plurality of equally spaced baffles (5), which are longitudinally arranged on the inner wall of the pulping tank (1) and located above the nozzle (8). The width direction of the baffles (5) is consistent with the radial direction of the pulping tank (1).

8. The wet desulfurization slurry preparation apparatus as described in claim 7, characterized in that, Each of the partitions (5) corresponds to one of the nozzles (8).

9. The wet desulfurization slurry preparation apparatus as described in claim 1, characterized in that, The pulping tank (1) has an exhaust port (2) at its upper end.

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