A gasification black water hardening device based on efficient sedimentation and sludge recycling

Abstract

This utility model discloses a gasification black water hardening device based on efficient sedimentation and sludge recycling. It includes a support frame, on which a coagulation unit, a flocculation unit, and a clarification unit are integrated. The coagulation unit includes a coagulation tank I and a magnesium agent reaction tank. The lower end of coagulation tank I is connected to the magnesium agent reaction tank via an overflow channel. The flocculation unit includes a sodium carbonate reaction tank, a coagulation tank II, and a flocculation tank. The magnesium agent reaction tank is connected to the sodium carbonate reaction tank via an overflow channel, and the sodium carbonate reaction tank is connected to coagulation tank II via an overflow channel. Coagulation tank II is connected to the flocculation tank via an overflow channel. The upper part of the flocculation tank is connected to the clarification unit via a pipeline. The clarification unit is equipped with a sludge discharge pipe connected to coagulation tank I. This utility model integrates all functional units onto a single support frame, resulting in a reasonable layout and saving space. By returning some of the sludge from the clarification unit to coagulation tank I via a return pipeline, it can reduce reagent consumption and lower costs.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a gasification black water hardening device based on efficient sedimentation and sludge recycling. Background Technology

[0002] Gasification black water is a solid-liquid mixture produced during coal chemical gasification, containing a large amount of coal slag, solid particles, and corrosive components. It mainly originates from the bottom drainage of equipment such as gasifiers and scrubbing towers. Gasification black water is characterized by high hardness (calcium and magnesium ion concentration >1000 mg / L), high silicon content (>150 mg / L), and a large amount of suspended solids. Traditional treatment processes often employ "coagulation sedimentation + mechanical dewatering" technology. Existing technologies generally suffer from the following problems: large overall footprint, high reagent consumption, and the need to add excessive amounts of sodium hydroxide and sodium carbonate to adjust pH and precipitate hardness ions; reagent costs account for more than 40% of total costs. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a gasification black water hardening device based on efficient sedimentation and sludge recycling. This utility model can reduce costs by occupying less land area and by recycling sludge.

[0004] The technical solution of this utility model is as follows:

[0005] A gasification black water hardening device based on efficient sedimentation and sludge recycling includes a support frame, which is equipped with a coagulation unit, a flocculation unit, and a clarification unit.

[0006] The coagulation unit includes a coagulation tank I and a magnesium agent reaction tank. Coagulation tank I is equipped with an inlet, a sodium hydroxide dosing pipe I, and a magnesium agent dosing pipe II. The lower end of coagulation tank I is connected to the magnesium agent reaction tank through an overflow channel.

[0007] The flocculation unit includes a sodium carbonate reaction tank, a coagulation tank II, and a flocculation tank. The magnesium agent reaction tank is connected to the sodium carbonate reaction tank through an overflow channel. The sodium carbonate reaction tank is connected to the coagulation tank II through an overflow channel. The coagulation tank II is connected to the flocculation tank through an overflow channel. The upper part of the flocculation tank is connected to the clarification unit through a pipeline. The clarification unit is equipped with a sludge discharge pipe connected to the coagulation tank I.

[0008] It also includes a post-mixing tank, which is close to the coagulation tank I on one side and the clarification unit on the other. The post-mixing tank is connected to the outlet of the clarification unit through a pipeline and is equipped with a sulfuric acid dosing pipe VI.

[0009] The clarification unit is a clarification tank, which contains a water collection trough, an inclined tube sedimentation zone, and a sludge thickening hopper arranged sequentially from top to bottom. The water collection trough is made of stainless steel and its lower end is connected to the inclined tube sedimentation zone. The water collection trough is also connected to the post-mixing tank through a pipeline. The inclined tube sedimentation zone is connected to the flocculation tank and is equipped with ethylene-propylene copolymer inclined tube packing. Its lower end is connected to the sludge thickening hopper, and the sludge is discharged from the lower end of the sludge thickening hopper through a screw pump.

[0010] The overflow channel consists of a baffle plate and an overflow plate.

[0011] The coagulation tank I, magnesium agent reaction tank, sodium carbonate reaction tank, coagulation tank II, flocculation tank, and post-mixing tank are all equipped with paddle agitators.

[0012] The coagulation tank I and the post-mixing tank are equipped with pH meters.

[0013] The sodium carbonate reaction tank is equipped with sodium carbonate dosing pipe III, the coagulation tank II is equipped with iron salt dosing pipe IV, and the flocculation tank is equipped with PAM dosing pipe and a central guide tube.

[0014] Sodium hydroxide dosing pipe I, magnesium dosing pipe II, sodium carbonate dosing pipe III, iron salt dosing pipe IV, and PAM dosing pipe V are all connected to the corresponding powder dissolving tanks via dosing pipelines, and the dosing pipelines are equipped with metering pumps.

[0015] The device also includes a controller, which is connected to the circuits of each metering pump and pH meter to receive signals and control the operation of each dosing tube.

[0016] The sludge discharge pipe of the clarification unit is mainly connected to the plate and frame filter press, and part of the sludge is returned to the coagulation tank I by a screw pump (flow rate 15 m³ / h).

[0017] The functional units of the entire device are rationally arranged. From a top-down view, the clarification unit is located in the lower right corner of the support. The coagulation tank I and the post-mixing tank are located next to the clarification unit on one side, i.e., the lower left corner of the support. The magnesium reaction tank, sodium carbonate reaction tank, coagulation tank II, and flocculation tank are arranged in a row in the upper half of the support. A maintenance ladder is provided in the lower left corner of the support, and a maintenance platform is provided on the top of the entire device.

[0018] This utility model has the following beneficial effects:

[0019] This utility model integrates all functional units onto a single support frame, resulting in a reasonable layout and saving space. By using a return pipeline to return some of the sludge from the clarification unit to the coagulation tank I, it can reduce reagent consumption and lower costs. Attached Figure Description

[0020] Figure 1 This is a front view of the present utility model;

[0021] Figure 2for Figure 1 A top-view structural diagram;

[0022] Figure 3 This is a schematic diagram of the overflow channel.

[0023] Figure 4 This is a flowchart of the process flow of this utility model.

[0024] 1-Coagulation tank I; 2-Magnesium agent reaction tank 2; 3-Sodium carbonate reaction tank 3; 4-Coagulation tank II; 5-Flocculation tank 5; 6-Clarification unit 6; 7-Post-mixing tank 7; 8-Agitator 8; 9-Baffle plate 9; 10-Overflow plate; 11-Inlet 11; 12-Sodium hydroxide dosing pipe I; 13-Magnesium agent dosing pipe II; 31-Sodium carbonate dosing pipe III; 41-Iron salt dosing pipe IV; 51-PAM dosing pipe V; 61-Inclined tube sedimentation zone; 62-Sludge thickening hopper; 63-Water collection tank; 64-Sludge discharge pipe; 71-Sulfuric acid dosing pipe VI; 72-Outlet. Detailed Implementation

[0025] The following will be combined with the appendix Figure 1 This invention provides a clear and complete description of the technical solution of the present invention: a gasification black water hardening device based on efficient sedimentation and sludge recycling. It includes a support frame, on which a coagulation unit, a flocculation unit, and a clarification unit 6 are integrated. From a top view, the clarification unit 6 is located in the lower right corner of the support frame. The coagulation tank I1 and the post-mixing tank 7 are located adjacent to the clarification unit 6 on one side, i.e., the lower left corner of the support frame. The magnesium agent reaction tank 2, the sodium carbonate reaction tank 3, the coagulation tank II4, and the flocculation tank 5 are arranged in a row in the upper half of the support frame. A maintenance ladder is provided in the lower left corner of the support frame, and a maintenance platform is provided above the entire device.

[0026] The coagulation unit includes a coagulation tank I1 and a magnesium agent reaction tank 2. The coagulation tank I1 is equipped with an inlet 11, a sodium hydroxide dosing pipe I12, and a magnesium agent dosing pipe II13. The lower end of the coagulation tank I1 is connected to the magnesium agent reaction tank 2 through an overflow channel.

[0027] The flocculation unit includes a sodium carbonate reaction tank 3, a coagulation tank II 4, and a flocculation tank 5. The magnesium agent reaction tank 2 is connected to the sodium carbonate reaction tank 3 through an overflow channel. The sodium carbonate reaction tank 3 is connected to the coagulation tank II 4 through an overflow channel. The coagulation tank II 4 is connected to the flocculation tank 5 through an overflow channel. The upper part of the flocculation tank 5 is connected to the clarification unit 6 through a pipeline. The clarification unit 6 is equipped with a sludge discharge pipe connected to the coagulation tank I 1.

[0028] It also includes a post-mixing tank 7, which is close to the coagulation tank I1 on one side and the clarification unit 6 on the other side. The post-mixing tank 7 is connected to the outlet of the clarification unit 6 through a pipeline. It is equipped with a sulfuric acid dosing pipe VI 71 to adjust the pH value of the effluent, and it is also equipped with an outlet pipe 72.

[0029] Clarification unit 6 is a clarification tank, in which a water collection trough 63, an inclined tube sedimentation zone 61, and a sludge thickening hopper 62 are arranged sequentially from top to bottom. The water collection trough is a stainless steel water collection trough, and its lower end is connected to the inclined tube sedimentation zone. The water collection trough is connected to the post-mixing tank 7 through a pipeline. The inclined tube sedimentation zone is connected to the flocculation tank 5. It is equipped with ethylene-propylene copolymer inclined tube packing, and its lower end is connected to the sludge thickening hopper. The sludge is discharged from the lower end of the sludge thickening hopper through a screw pump.

[0030] The overflow channel is composed of a baffle plate 9 and an overflow plate 10.

[0031] The coagulation tank I1, magnesium agent reaction tank 2, sodium carbonate reaction tank 3, coagulation tank II 4, flocculation tank 5, and post-mixing tank 7 are all equipped with paddle agitators 8, and a sludge suction pump is installed at the bottom of the tank. For the directional precipitation of hardness ions, in the coagulation tank I1, the pH is adjusted to above 10.5 by sodium hydroxide, so that Ca ions form CaCO3 precipitate and Mg ions form Mg(OH)2 precipitate.

[0032] pH meters are installed in the coagulation tank I1 and the post-mixing tank 7.

[0033] The sodium carbonate reaction tank 3 is equipped with a sodium carbonate dosing pipe Ⅲ31, the coagulation tank Ⅱ4 is equipped with an iron salt dosing pipe Ⅳ41, and the flocculation tank 5 is equipped with a PAM dosing pipe and a central guide tube.

[0034] Sodium hydroxide dosing pipe I12, magnesium dosing pipe II13, sodium carbonate dosing pipe III, iron salt dosing pipe IV41, and PAM dosing pipe V51 are all connected to the corresponding powder dissolving tanks through dosing pipelines. The dosing pipelines are equipped with metering pumps. The powder dissolving tanks are equipped with screw feeders connected to the powder silos. The dissolving tanks or dissolving pools are equipped with a stirrer 8.

[0035] The device also includes a controller, which is connected to the circuits of each metering pump and pH meter to receive signals and control the operation of each dosing tube.

[0036] The sludge discharge pipe of the clarification unit 6 is mainly connected to the plate and frame filter press, and part of the sludge is returned to the coagulation tank I1 by a screw pump (flow rate 15 m³ / h).

[0037] The coagulation tank I1 is equipped with a built-in double-layer paddle agitator 8 (speed 90-120 rpm), and sodium hydroxide (to adjust the pH to 10.5-11.5) and magnesium agent (MgO, dosage 0.5-1.0 g / L) are added. The tank is equipped with an online pH meter, which is connected to the controller, so that the frequency of the dosing pump in the tank can be easily adjusted by PLC.

[0038] The flocculation unit consists of 5 plug-flow flocculation tanks: equipped with 8 low-speed variable frequency agitators (7-38 rpm), and a central guide tube is installed inside the flocculation tank 5.

[0039] Clarification unit 6 is connected to a plate and frame filter press via a sludge discharge pipe. It has a processing capacity of 55 m³ / h, a pressing pressure of 1.6 MPa, and is equipped with a high-pressure flushing pump (pressure 6 MPa) and an air storage tank.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model. These improvements should also be considered within the scope of protection of the present utility model without creative effort.

Claims

1. A gasification black water hardening removal device based on high-efficiency sedimentation and sludge recycling, characterized in that: It includes The support structure is equipped with coagulation, flocculation, and clarification units. The coagulation unit includes a coagulation tank I and a magnesium agent reaction tank. Coagulation tank I is equipped with an inlet, a sodium hydroxide dosing pipe I, and a magnesium agent dosing pipe II. The lower end of coagulation tank I is connected to the magnesium agent reaction tank through an overflow channel. The flocculation unit includes a sodium carbonate reaction tank, a coagulation tank II, and a flocculation tank. The magnesium agent reaction tank is connected to the sodium carbonate reaction tank through an overflow channel. The sodium carbonate reaction tank is connected to the coagulation tank II through an overflow channel. The coagulation tank II is connected to the flocculation tank through an overflow channel. The upper part of the flocculation tank is connected to the clarification unit through a pipeline. The clarification unit is equipped with a sludge discharge pipe connected to the coagulation tank I.

2. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 1, characterized in that: It also includes a post-mixing tank, which is close to the coagulation tank I on one side and the clarification unit on the other. The post-mixing tank is connected to the outlet of the clarification unit through a pipeline and is equipped with a sulfuric acid dosing pipe VI.

3. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 1, characterized in that: The clarification unit is a clarification tank, which contains a water collection trough, an inclined tube sedimentation zone, and a sludge thickening hopper arranged sequentially from top to bottom. The water collection trough is made of stainless steel and its lower end is connected to the inclined tube sedimentation zone. The water collection trough is also connected to the post-mixing tank through a pipeline. The inclined tube sedimentation zone is connected to the flocculation tank and is equipped with ethylene-propylene copolymer inclined tube packing. Its lower end is connected to the sludge thickening hopper, and the sludge is discharged from the lower end of the sludge thickening hopper through a screw pump.

4. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 2, characterized in that: The coagulation tank I, magnesium agent reaction tank, sodium carbonate reaction tank, coagulation tank II, flocculation tank, and post-mixing tank are all equipped with paddle agitators.

5. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 2, characterized in that: The coagulation tank I and the post-mixing tank are equipped with pH meters.

6. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 5, characterized in that: The sodium carbonate reaction tank is equipped with sodium carbonate dosing pipe III, the coagulation tank II is equipped with iron salt dosing pipe IV, and the flocculation tank is equipped with PAM dosing pipe and a central guide tube.

7. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 6, characterized in that: Sodium hydroxide dosing pipe I, magnesium dosing pipe II, sodium carbonate dosing pipe III, iron salt dosing pipe IV, and PAM dosing pipe V are all connected to the corresponding powder dissolving tanks via dosing pipelines, and the dosing pipelines are equipped with metering pumps.

8. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 7, characterized in that: The device also includes a controller, which is connected to the circuits of each metering pump and pH meter.

9. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 1, characterized in that: The sludge discharge pipe of the clarification unit is connected to a plate and frame filter press, and part of the sludge is returned to coagulation tank I via a screw pump.

10. The gasification black water hardening device based on high-efficiency sedimentation and sludge recycling according to claim 2, characterized in that: Coagulation tank I and post-mixing tank are located adjacent to each other on one side of the clarification unit, while magnesium agent reaction tank, sodium carbonate reaction tank, coagulation tank II and flocculation tank are arranged in a row.

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