Wet desulphurization slurry preparation equipment

Abstract

The utility model discloses wet desulphurization slurry preparation equipment, which comprises a slurry preparation tank, a slurry conveying main pipe, a circulating pump, a slurry discharge pump and a spray head, a process water inlet pipe and an ash inlet valve are arranged at the top of the slurry preparation tank, an inlet of the slurry discharge pump is connected with the slurry preparation tank, the slurry conveying main pipe is an annular pipe or a C-shaped pipe sleeved on the outer side of the lower end of the slurry preparation tank, and the spray head is arranged on the slurry conveying main pipe. A plurality of spray heads are located on the upper portion of a bottom plate of the pulping tank and evenly distributed around the axis of the pulping tank, a liquid inlet of each spray head is connected with a pulp conveying main pipe through a pulp conveying branch pipe, the spraying direction of each spray head is the tangential direction of the circumference, coaxial with the pulping tank, of a nozzle, and a liquid inlet of the circulating pump is connected with a pulp outlet of the pulping tank. And the liquid outlet is connected with the slurry conveying main pipe. According to the utility model, the slurry forms a complex vortex in the slurry preparation tank by utilizing power provided by the circulating pump, so that the precipitation at the bottom of the tank can be prevented, the blockage and cutoff faults of the slurry discharge port are avoided, the reliability of slurry preparation equipment is greatly improved, the slurry supply capacity is improved, and the continuous operation of a wet desulphurization process is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of equipment for preparing wet desulphurization slurry, belong to the separation technology field of gas. BACKGROUND

[0002] Wet desulphurization is the flue gas desulfurization process commonly used in environmental protection industry, under the premise of guaranteeing flue gas emission index, reducing operating cost and improving process operation ability is very important.

[0003] At present, environmental protection industry generally uses agitator to stir slurry preparation.Calcium carbonate flows into slurry preparation tank through ash inlet valve, then dilutes by adding water through electric valve at the top of slurry preparation tank, and completes slurry preparation by using agitator to stir uniformly.Due to the long transmission shaft of agitator and the large size of agitator blade, the torsional moment borne by agitator is very large, and long-time operation is prone to cause transmission shaft fracture, blade deformation and other faults, which affects the normal operation of equipment.If the size of agitator blade is reduced, the stirring interval in slurry preparation tank will become smaller, and sedimentation zone will be generated around, and the greater the slurry density value, the faster the sedimentation, which causes the formation of pot bottom type ash deposition at the bottom of slurry preparation tank and blocks slurry discharge port, and is prone to cause problems such as empty suction of slurry discharge pump and interruption of slurry supplementing, thereby causing the desulfurization efficiency of absorption tower to decrease and the flue gas emission index to exceed the standard, and the long fault handling time greatly restricts the continuous operation of production process. CONTENT OF UTILITY MODEL

[0004] The utility model aims at the drawbacks of prior art, and provides a kind of wet desulphurization slurry preparation equipment to improve the operation reliability of equipment, reduce failure rate and ensure the continuous operation of wet desulphurization process.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A kind of wet desulphurization slurry preparation equipment, including slurry preparation tank, slurry conveying main pipe, circulating pump, slurry discharge pump and multiple spray heads, the slurry preparation tank is cylindrical, and its top is provided with process water inlet pipe and ash inlet valve, the inlet of slurry discharge pump is connected with the slurry discharge port in the lower part of the side wall of slurry preparation tank, the slurry conveying main pipe is annular pipe or C-shaped pipe sleeved outside the lower end of slurry preparation tank, multiple spray heads are located on the upper part of the bottom plate of slurry preparation tank and are evenly distributed around the axis of slurry preparation tank, the liquid inlet of each spray head is connected with slurry conveying main pipe through slurry conveying branch pipe penetrating the side wall of slurry preparation tank, and the spray direction of spray head is the tangent direction of spray opening and the coaxial circle of slurry preparation tank, the liquid inlet of circulating pump is connected with the slurry outlet of slurry preparation tank, and the liquid outlet is connected with slurry conveying main pipe.

[0007] The above-mentioned wet desulphurization slurry preparation equipment also includes multiple cyclone baffles, which are located in the upper part of slurry preparation tank and are evenly distributed around the axis of slurry preparation tank, one vertical edge of each cyclone baffle is fixedly connected with the inner wall of slurry preparation tank, and the other vertical edge is opposite to the axis of slurry preparation tank.

[0008] The wet desulfurization slurry preparation equipment, the nozzle of the spray head is connected with the slurry conveying branch pipe, the outlet of the nozzle is opposite to the inlet of the diffuser, and the gap is connected through the connecting arm.

[0009] The wet desulfurization slurry preparation equipment, the top of the slurry preparation tank is provided with an exhaust pipe.

[0010] The wet desulfurization slurry preparation equipment, the spray head and the cyclone baffle are all provided with three, and the three cyclone baffles are located directly above the three spray heads.

[0011] The wet desulfurization slurry preparation equipment, the ash inlet valve is provided with two.

[0012] The wet desulfurization slurry preparation equipment, the top of the slurry preparation tank is provided with an exhaust pipe. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model makes further detailed instructions in combination with the drawings and specific embodiment.

[0014] Figure 1 It is the structure schematic diagram of the utility model;

[0015] Figure 2 It is Figure 1 A-A section view of it;

[0016] Figure 3 It is the installation schematic diagram of the cyclone baffle;

[0017] Figure 4 It is the structure schematic diagram of the venturi power spray head.

[0018] The various reference numerals in the drawings are as follows:

[0019] 1, ash inlet valve, 2, slurry preparation tank, 3, slurry pump, 4, slurry conveying main pipe, 5, slurry conveying branch pipe, 6, spray head, 7, cyclone baffle, 8, circulating pump, 9, process water inlet pipe, 10, exhaust pipe;

[0020] 6-1, nozzle, 6-2, diffuser. DETAILED DESCRIPTION

[0021] The utility model provides a kind of wet desulfurization slurry preparation equipment, which can avoid the phenomenon of slurry outlet blockage and reagent (calcium carbonate) precipitation, ensuring continuous slurry supply and solving the problems in the prior art.

[0022] Referring to Figures 1-4 The utility model mainly includes ash valve 1, pulping jar 2, discharge pump 3, main pipe 4, branch pipe 5, spray head 6, cyclone baffle 7, circulating pump 8, process water inlet pipe 9 and exhaust pipe 10.

[0023] Pulping jar 2 is cylindrical, and the top of pulping jar 2 is provided with process water inlet pipe 9, exhaust pipe 10 and two ash valves 1, the ash valve 1 is used to add calcium carbonate to pulping jar 2, process water inlet pipe 9 is connected with water source through electric valve, and is used to inject water to pulping jar 2, dilutes slurry in pulping jar 2, adjusts the concentration and density of slurry. The inlet of discharge pump 3 is connected with the discharge port of the lower part of the side wall of pulping jar 2 through pipeline, and is used to discharge the well-mixed desulfurization slurry. Main pipe 4 is annular pipe or C-shaped pipe, and is arranged at the lower end of the outside of pulping jar 2. Three spray heads 6 are located on the upper part of the bottom plate of pulping jar 2 and are evenly distributed around the axis of pulping jar 2. The inlet of each spray head 6 is connected with main pipe 4 through a branch pipe 5 penetrating the side wall of pulping jar 2. The spray direction of spray head 6 is the tangent direction of the coaxial circle of the nozzle and pulping jar 2. The inlet of circulating pump 8 is connected with the slurry outlet of the lower part of the side wall of pulping jar 2 through pipeline, and the outlet of circulating pump 8 is connected with main pipe 4. Three cyclone baffles 7 are located in the upper part of pulping jar 2 and are evenly distributed around the axis of pulping jar 2. One vertical edge of each cyclone baffle 7 is fixedly connected with the inner wall of pulping jar 2, and the other vertical edge is opposite to the axis of pulping jar 2.

[0024] Spray head 6 adopts Venturi spray head, including nozzle 6-1 and cylindrical diffuser 6-2. The inlet of nozzle 6-1 is connected with branch pipe 5, and the outlet of nozzle 6-1 is opposite to the inlet of diffuser 6-2. A gap is arranged between nozzle 6-1 and diffuser 6-2 and is connected through connecting arm.

[0025] In use, the calcium carbonate flows into the pulp making tank 2 through the ash inlet valve 1, is diluted by adding water through the process water inlet pipe 9, and forms a slurry. The circulating pump 8 pumps the slurry in the pulp making tank 2 into the slurry conveying main pipe 4, and then into the multiple nozzles 6 in the lower part of the pulp making tank 2 through the slurry conveying branch pipes 5. The slurry is sprayed into the pulp making tank 2 along the tangential direction by the nozzles 6. Under the driving of the high-pressure slurry sprayed by the nozzles 6, the slurry at the bottom of the pulp making tank 2 rotates as a whole. When a certain flow rate is reached, a reverse cone-shaped vortex is formed in the middle of the pulp making tank 2. When the vortex meets the vortex baffle 7 arranged at the upper part 2 meters, the resistance of the vortex baffle 7 destroys the movement direction of the slurry, so that the slurry flows into the middle of the pulp making tank 2 and returns to the bottom of the tank body again, forming two alternating vortexes in the annular and longitudinal directions. The slurry is stirred uniformly by the vortexes. Since the vortex baffle 7 is arranged at the upper part 2 meters of the tank bottom, far away from the liquid surface, the splashing phenomenon of the upper slurry can be eliminated, and the stirring effect is greatly improved. The nozzles 6 adopt Venturi nozzles. The slurry around the nozzles 6 is made to flow by using the Venturi effect, so as to prevent the formation of sediment and realize the uniform preparation of the slurry without dead angle and sediment. The uniformly stirred slurry is discharged through the slurry discharge pump 3.

[0026] The pressure of the circulating pump 8 is 0.4-0.6 MPa. The type of the slurry conveying main pipe 4 is DN80, and the type of the slurry conveying branch pipe 5 is DN50. Considering the diameter of the tank body and the position of the slurry discharge point, three slurry conveying branch pipes 5 are arranged on the side wall 50 cm away from the tank bottom, and the nozzles 6 are connected 40 cm away from the tank bottom. The distance between the nozzles 6 and the side wall of the pulp making tank 2 is 20 cm.

[0027] The utility model has the advantages of stable and reliable operation, elimination of the slurry discharge pump blockage phenomenon caused by sediment, reduction of the personnel maintenance workload and equipment spare part consumption, and realization of continuous slurry supply.

Claims

1. A wet desulphurization slurry preparation apparatus, characterized by, The pulp making tank (2) is cylindrical in shape, and its top is provided with a process water inlet pipe (9) and an ash inlet valve (1). The inlet of the pulp discharge pump (3) is connected with the pulp discharge port at the lower part of the side wall of the pulp making tank (2). The pulp conveying main pipe (4) is an annular pipe or a C-shaped pipe sleeved outside the lower end of the pulp making tank (2). The plurality of spray heads (6) are located at the upper part of the bottom plate of the pulp making tank (2) and are uniformly distributed around the axis of the pulp making tank (2). The liquid inlet of each spray head (6) is connected with the pulp conveying branch pipe (5) penetrating through the side wall of the pulp making tank (2) and the pulp conveying main pipe (4). The spray direction of the spray head (6) is the tangent direction of the spray port and the coaxial circle of the pulp making tank (2). The liquid inlet of the circulating pump (8) is connected with the pulp discharge port of the pulp making tank (2), and the liquid outlet is connected with the pulp conveying main pipe (4).

2. The wet desulphurization slurry preparation apparatus according to claim 1, characterized in that, A plurality of cyclone baffles (7) are also provided, which are located at the upper part of the pulp making tank (2) and are uniformly distributed around the axis of the pulp making tank (2). One vertical edge of each cyclone baffle (7) is fixedly connected with the inner wall of the pulp making tank (2), and the other vertical edge is opposite to the axis of the pulp making tank (2).

3. The wet desulphurization slurry preparation apparatus according to claim 1 or 2, characterized in that, The spray head (6) is a Venturi spray head, which comprises a nozzle (6-1) and a cylindrical diffuser (6-2). The inlet of the nozzle (6-1) is connected with the pulp conveying branch pipe (5), the outlet of the nozzle (6-1) is opposite to the inlet of the diffuser (6-2), and a gap is provided between the nozzle (6-1) and the diffuser (6-2) and connected through a connecting arm.

4. The wet desulphurization slurry preparation apparatus according to claim 3, characterized in that, The top of the pulp making tank (2) is provided with an exhaust pipe (10).

5. The wet desulphurization slurry preparation apparatus according to claim 2, characterized in that, The spray head (6) and the cyclone baffle (7) are each provided with three, and the three cyclone baffles (7) are respectively located directly above the three spray heads (6).

6. The wet desulphurization slurry preparation apparatus according to claim 3, characterized in that, The ash inlet valve (1) is provided with two.

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