CN115594273A - A method for purifying desulfurization wastewater from a thermal power plant - Google Patents

Abstract

The invention discloses a method for purifying desulfurization wastewater of a thermal power plant, which comprises the following steps: spill into the flocculating agent through the inside toward the retort, make the impurity in the liquid carry out the flocculation and precipitation, the impurity accessible waste liquid drain pipe of sediment discharges, and supernatant accessible overflow drain pipe discharges to this processing work to desulfurization waste water is accomplished, to the treatment process of desulfurization waste water, subsides, filters and three integrated processes of group of flocculation together, carries out abundant processing to sewage, and the hardware includes the preliminary treatment case, preliminary treatment case tip and grudging post fixed connection, and the inside fixed mounting of preliminary treatment case has the division board, and the sedimentation tank has been seted up to one side of division board simultaneously to the opposite side of division board has seted up concentrated pond, and the immersible pump is installed to the inside downside in concentrated pond, and the pipeline export setting on the immersible pump is directly over equal liquid frame. This desulfurization waste water purification method of thermal power plant, spill into the flocculating agent through the inside toward the retort, make the impurity in the liquid carry out the flocculation and precipitation, the impurity accessible waste liquid drain pipe of sediment discharges, supernatant accessible overflow drain pipe discharges, accomplish the treatment to desulfurization waste water with this, to the treatment process of desulfurization waste water, subside, it is integrated together to filter and three group's processes of flocculation, when carrying out abundant treatment to sewage, reducing device's area, reduce the treatment cost to denitration waste water.

Description

A method for purifying desulfurization wastewater from a thermal power plant

technical field

The invention relates to the field of wastewater purification, in particular to a method for purifying desulfurization wastewater in thermal power plants.

Background technique

The wastewater generated during the wet desulfurization process of boiler flue gas comes from the discharge water of the absorption tower; the impurities contained in the desulfurization and denitrification wastewater are mainly solid suspended solids, sulfates, chlorides and trace heavy metal elements, many of which are required by the national environmental protection standards The first type of pollutants that are strictly controlled, direct discharge will cause huge pollution to the environment; currently domestic treatment of this type of wastewater adopts a series of treatment settings such as regulating tanks, triple boxes, and mechanical clarifiers, and in order to prevent materials from each processing unit Multiple mechanical mixers are set up for deposition, and the one-time investment in wastewater treatment is large and occupies a large area, which directly increases the treatment cost of denitrification wastewater.

Contents of the invention

The object of the present invention is to provide a method for purifying desulfurization wastewater in a thermal power plant to solve the above mentioned defects in the background technology.

In order to achieve the above purpose, a method for purifying desulfurization wastewater in a thermal power plant is provided, including:

When in use, the sewage enters the interior of the settling tank (3) from the desulfurization wastewater inlet pipe (1) and four sets of settling pipes (2), and the impurity particles in the sewage are accumulated in the settling tank (3) under gravity. The supernatant enters the inside of the concentration tank (5) from the overflow hole (4), and at this time, the liquid inside the concentration tank (5) enters the inside of the liquid equalization frame (9) from the submersible pump (7). Under the action of the uniform distribution of the liquid equalizing frame (9), the liquid can evenly contact the upper surface of the filter layer and the packing filter layer (11), and finally enter the inside of the reaction tank (14), and pass through The inside of the reaction tank (14) is sprinkled with a flocculant to flocculate and precipitate impurities in the liquid. The precipitated impurities can be discharged through the waste liquid outlet pipe (16), and the supernatant can be discharged through the overflow liquid outlet pipe (15). Discharge, in order to complete the treatment of desulfurization wastewater, the treatment process of desulfurization wastewater, three sets of processes of sedimentation, filtration and flocculation are integrated together, while fully treating the sewage, reduce the footprint of the device and reduce the impact on The treatment cost of denitrification wastewater;

Sprinkle the flocculant into the pretreatment box to make the impurities in the liquid flocculate and precipitate, the precipitated impurities can be discharged through the waste liquid outlet pipe, and the supernatant can be discharged through the overflow liquid outlet pipe, so as to complete the treatment. The treatment of desulfurization wastewater, the treatment process of desulfurization wastewater, the three sets of processes of sedimentation, filtration and flocculation are integrated together to fully treat the sewage;

A pretreatment box, the end of the pretreatment box is fixedly connected to the vertical frame, and the inside of the pretreatment box is fixedly installed with an isolation plate, and at the same time, a settling tank is provided on one side of the isolation plate, and a concentration tank is provided on the other side away from the plate. A submersible pump is installed on the inner lower side of the concentration pool, and the pipeline outlet on the submersible pump is set directly above the liquid equalization frame, and the desulfurization wastewater enters the pipe after installation on the pretreatment tank;

Vertical frame, the upper end of the vertical frame is fixedly connected with the filter box, and the liquid equalization frame is installed on the upper side of the filter box, and the bottom of the liquid equalization frame is successively installed with a filter layer and a packing filter layer, and the outlet pipe at the bottom of the vertical frame is connected to the The reaction tanks are arranged in communication, and a first rotating shaft and a second rotating shaft are respectively installed inside the reaction tank, and the ends of the first rotating shaft and the second rotating shaft are respectively installed with a second pulley and a first pulley.

Preferably, four sets of settling tubes are evenly welded at the end of the desulfurization wastewater inlet pipe, and the four sets of settling tubes are arranged on the upper side of the settling tank, the overflow hole is opened on the isolation plate, and the settling tank and the concentration tank The connection between them is set through the overflow hole.

Preferably, the section of the liquid equalizing frame is set in a "U" shape, and multiple sets of overflow tubes are evenly fixed inside the liquid equalizing frame, and the length of the overflow tubes is greater than the thickness of the bottom plate of the liquid equalizing frame, and multiple sets of The overflow cylinder is evenly distributed directly above the packing filter layer.

Preferably, the filter box is communicated with the reaction tank through a communication pipe, and a waste liquid outlet pipe is installed at the bottom of the reaction tank, and an overflow outlet pipe is installed on the upper right side of the reaction tank, and the overflow outlet pipe A water pump is installed.

Preferably, a feeding pipe is installed on the reaction tank, and multiple sets of stirring blades are evenly welded and fixed on the first rotating shaft and the second rotating shaft inside the reaction tank, and slots are opened at the ends of the stirring blades.

Preferably, the transmission connection between the first pulley and the second pulley is carried out through a V-belt, and the rotating shaft of the second pulley is fixedly connected with the output shaft of the geared motor through a coupling, and the geared motor is fixed by the base on the outer wall of the frame.

Preferably, the stirring blades are evenly arranged in four groups along the outer circumferential positions of the first rotating shaft and the second rotating shaft, and the cross section of the stirring blades is arranged in a spoon shape.

Compared with the prior art, the beneficial effect of the present invention is: the impurities in the liquid are flocculated and precipitated by sprinkling flocculant into the inside of the reaction tank, and the precipitated impurities can be discharged through the waste liquid outlet pipe, and the supernatant It can be discharged through the overflow outlet pipe to complete the treatment of desulfurization wastewater. The treatment process of desulfurization wastewater, the three sets of processes of sedimentation, filtration and flocculation are integrated together to fully treat the sewage and reduce the device. The occupied area reduces the treatment cost of denitrification wastewater.

Description of drawings

Fig. 1 is the front schematic diagram of structure of the present invention;

Fig. 2 is the schematic diagram of the structure liquid homogenization frame of the present invention;

Fig. 3 is the top view of the liquid equalizing frame of the structure of the present invention;

Fig. 4 is a top view of the reaction tank with the structure of the present invention.

Labels in the figure: 1. Desulfurization wastewater inlet pipe; 2. Settling pipe; 3. Settling tank; 4. Overflow hole; 5. Concentration tank; 6. Pretreatment box; 7. Submersible pump; 8. Filter box; 10. Overflow cylinder; 11. Packing filter layer; 12. Vertical frame; 13. Connecting pipe; 14. Reaction tank; 15. Overflow liquid pipe; 16. Waste liquid liquid pipe; 17. First Rotating shaft; 18, stirring blade; 19, second rotating shaft; 20, slotting; 21, first pulley; 22, second pulley; 23, reduction motor.

detailed description

Please refer to Figures 1-4, the present invention provides a method for purifying desulfurization wastewater in thermal power plants, including: when in use, sewage enters the desulfurization wastewater inlet pipe (1) and four sets of settling pipes (2) into the settling tank (3) The impurity particles in the sewage are accumulated at the bottom of the sedimentation tank (3) under gravity, and the supernatant enters the inside of the concentration tank (5) from the overflow hole (4). At this time, the concentration tank (5) ) from the submersible pump (7) into the inside of the liquid equalizing frame (9), under the uniform distribution of the liquid equalizing frame (9), the liquid can be evenly mixed with the filter layer and the packing filter layer (11) The upper surface is evenly contacted, and finally enters the inside of the reaction tank (14), and the flocculant is sprinkled into the inside of the reaction tank (14), so that the impurities in the liquid are flocculated and precipitated, and the precipitated impurities can be discharged through the waste liquid. The liquid pipe (16) is discharged, and the supernatant liquid can be discharged through the overflow liquid pipe (15), so as to complete the treatment of desulfurization wastewater. For the treatment of desulfurization wastewater, the three groups of processes of sedimentation, filtration and flocculation are integrated in the At the same time, while the sewage is fully treated, the floor area of the device is reduced, and the cost of denitrification wastewater treatment is reduced;

Sprinkle the flocculant into the pretreatment box to make the impurities in the liquid flocculate and precipitate, the precipitated impurities can be discharged through the waste liquid outlet pipe, and the supernatant can be discharged through the overflow liquid outlet pipe, so as to complete the treatment. The treatment of desulfurization wastewater, the treatment process of desulfurization wastewater, the three sets of processes of sedimentation, filtration and flocculation are integrated together to fully treat the sewage;

The end of the pretreatment box 6 is fixedly connected to the vertical frame 12, and the inside of the pretreatment box 6 is fixedly installed with an isolation plate, while a settling tank 3 is provided on one side of the isolation plate, and a concentration pool 5 is provided on the other side away from the plate. A submersible pump 7 is installed on the inner lower side of the concentration pool 5, and the pipeline outlet on the submersible pump 7 is arranged directly above the liquid equalizing frame 9, and the desulfurization wastewater enters the pipe 1 after the pretreatment tank 6 is installed;

The upper end of the vertical frame 12 is fixedly connected with the filter box 8, and the liquid equalization frame 9 is installed on the inner upper side of the filter box 8. At the same time, the bottom of the liquid equalization frame 9 is installed with a filter layer and a packing filter layer 11 in turn, and the outlet at the bottom of the vertical frame 12 is The pipe is communicated with the reaction tank 14, and the inside of the reaction tank 14 is respectively equipped with a first rotating shaft 17 and a second rotating shaft 19, and the ends of the first rotating shaft 17 and the second rotating shaft 19 are respectively equipped with a second pulley 22 and a first rotating shaft. Pulley 21.

Working principle: When in use, the sewage enters the interior of the settling tank 3 from the desulfurization wastewater inlet pipe 1 and four sets of settling pipes 2, and the impurity particles in the sewage accumulate at the bottom of the settling tank 3 under gravity, and the supernatant The liquid enters the inside of the concentration pool 5 from the overflow hole 4. At this time, the liquid in the concentration pool 5 enters the inside of the liquid equalizing frame 9 from the submersible pump 7. Under the uniform distribution of the liquid equalizing frame 9, the liquid can be evenly distributed. The upper surface of the filter layer and the filler filter layer 11 is evenly contacted, and finally enters the inside of the reaction tank 14, and the flocculant is sprinkled into the inside of the reaction tank 14, so that the impurities in the liquid are flocculated and precipitated, and the precipitated Impurities can be discharged through the waste liquid outlet pipe 16, and the supernatant liquid can be discharged through the overflow liquid outlet pipe 15, so as to complete the treatment of desulfurization wastewater. The treatment process of desulfurization wastewater includes three sets of processes: sedimentation, filtration and flocculation Integrated together, while fully treating sewage, it reduces the footprint of the device and reduces the cost of denitrification wastewater treatment.

As a preferred embodiment, the end of the desulfurization wastewater inlet pipe 1 is evenly welded with four sets of settling tubes 2, and the four sets of settling tubes 2 are arranged on the inner upper side of the settling tank 3, and the overflow hole 4 is opened in the isolated The settling tank 3 and the concentrating tank 5 are communicated through the overflow hole 4.

As shown in Figure 1: four sets of settling tubes 2 are arranged on the inner upper side of the settling tank 3, and the waste water gushes down from the four sets of settling tubes 2 and impacts on the bottom of the settling tank 3, and large particles of impurities in the waste water are deposited in the settling tank 3, after the filtration work is completed, the sediment inside the settling tank 3 can be processed through the manhole.

As a preferred embodiment, the section of the liquid equalizing frame 9 is set in a "U" shape, and the inside of the liquid equalizing frame 9 is evenly fixed with multiple sets of overflow tubes 10, and the length of the overflow tubes 10 is longer than that of the liquid equalizing frame 9. The thickness of the bottom plate of the frame 9, and multiple sets of overflow cylinders 10 are evenly distributed directly above the packing filter layer 11.

As shown in Figure 1-3: the length of the overflow tube 10 is greater than the thickness of the bottom plate of the liquid equalizing frame 9. To flow down, to contact evenly with the filter system inside the filter box 8 .

As a preferred embodiment, the filter box 8 is communicated with the reaction tank 14 through a communication pipe 13, and a waste liquid outlet pipe 16 is installed at the bottom of the reaction tank 14, and an overflow pipe 16 is installed on the upper right side of the reaction tank 14. The liquid pipe 15 flows out, and a water pump is installed on the overflow liquid pipe 15 .

A water pump is installed on the overflow outlet pipe 15, through which the supernatant liquid on the upper side of the reaction tank 14 can be sucked away, and the waste liquid deposited at the bottom is returned to the inside of the settling tank 3 for circulation treatment.

As a preferred embodiment, the reaction tank 14 is equipped with a feeding pipe, and the first rotating shaft 17 and the second rotating shaft 19 inside the reaction tank 14 are evenly welded and fixed with multiple groups of stirring blades 18, and the ends of the stirring blades 18 are opened. There are slotted 20.

As shown in Figure 1: the first rotating shaft 17 and the second rotating shaft 19 rotate, driving the stirring blade 18 on it to rotate, so that the waste liquid inside the reaction tank 14 and the flocculant are fully contacted, after the contact is completed, close the deceleration The switch of motor 23 makes the mixture in reaction tank 14 carry out uniform settling work.

As a preferred embodiment, the transmission connection between the first pulley 21 and the second pulley 22 is carried out through a V-belt, and the rotating shaft of the second pulley 22 is fixedly connected with the output shaft of the reduction motor 23 through a coupling , while the reduction motor 23 is fixed on the outer wall of the vertical frame 12 through the machine base.

As a preferred embodiment, the stirring blades 18 are evenly arranged in four groups along the outer circumferential positions of the first rotating shaft 17 and the second rotating shaft 19 , and the cross section of the stirring blades 18 is arranged in a spoon shape.

As shown in Figure 1: the section of the stirring blade 18 is spoon-shaped, and the stirring blade 18 is provided with a slot 20, and the stirring blade 18 rotates. Through the slot 20, the water body can be fully stirred, and the flocculant can be increased. The collision efficiency with the water body improves the flocculation effect of sewage.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. A method for purifying desulfurization wastewater from a thermal power plant, characterized in that it comprises: when in use, the sewage enters the inside of the settling tank (3) from the desulfurization wastewater inlet pipe (1) and four sets of settling pipes (2), and the sewage The impurity particles in the sedimentation tank (3) accumulate at the bottom of the settling tank (3) under gravity, and the supernatant enters the inside of the concentration tank (5) from the overflow hole (4). At this time, the liquid in the concentration tank (5) Since the submersible pump (7) enters the inside of the liquid equalizing frame (9), under the uniform distribution of the liquid equalizing frame (9), the liquid can be evenly mixed with the upper surface of the filter layer and the packing filter layer (11). Uniform contact, and finally enter the interior of the reaction tank (14), and sprinkle the flocculant into the interior of the reaction tank (14), so that the impurities in the liquid are flocculated and precipitated, and the precipitated impurities can pass through the waste liquid outlet pipe (16 ), and the supernatant can be discharged through the overflow outlet pipe (15) to complete the treatment of desulfurization wastewater. For the treatment of desulfurization wastewater, the three groups of processes of sedimentation, filtration and flocculation are integrated together to treat sewage While performing sufficient treatment work, reduce the footprint of the device and reduce the treatment cost of denitrification wastewater; Sprinkle the flocculant into the pretreatment box to make the impurities in the liquid flocculate and precipitate, the precipitated impurities can be discharged through the waste liquid outlet pipe, and the supernatant can be discharged through the overflow liquid outlet pipe, so as to complete the treatment. The treatment of desulfurization wastewater, the treatment process of desulfurization wastewater, the three sets of processes of sedimentation, filtration and flocculation are integrated together to fully treat the sewage; The pretreatment box (6), the end of the pretreatment box (6) is fixedly connected with the vertical frame (12), and the inside of the pretreatment box (6) is fixedly installed with an isolation plate, and one side of the isolation plate is provided with a settlement pool (3), and a concentrating pool (5) is provided on the other side away from the plate, and a submersible pump (7) is installed on the inner lower side of the concentrating pool (5), and the pipeline outlet on the submersible pump (7) is set at the uniform Directly above the liquid frame (9), the desulfurization waste water enters the pipe (1) after installation on the pretreatment box (6); A vertical frame (12), the upper end of the vertical frame (12) is fixedly connected with the filter box (8), and the liquid equalization frame (9) is installed on the inner upper side of the filter box (8), and the liquid equalization frame (9) A filter layer and a packing filter layer (11) are successively installed at the bottom of the vertical frame (12). The ends of the second rotating shaft (19), the first rotating shaft (17) and the second rotating shaft (19) are respectively equipped with a second pulley (22) and a first pulley (21). 2. A method for purifying desulfurization wastewater from a thermal power plant according to claim 1, characterized in that four sets of settling tubes (2) are evenly welded at the end of the desulfurization wastewater inlet pipe (1), and the four sets of settling tubes (2) are installed The pipe (2) is set on the inner upper side of the settling tank (3), the overflow hole (4) is opened on the isolation plate, and the flow between the settling tank (3) and the concentration tank (5) is carried out through the overflow hole (4). Connectivity settings. 3. A method for purifying desulfurization wastewater from thermal power plants according to claim 1, characterized in that: the section of the liquid equalizing frame (9) is arranged in a "U" shape, and the interior of the liquid equalizing frame (9) is evenly fixed There are multiple sets of overflow tubes (10), and the length of the overflow tubes (10) is greater than the thickness of the bottom plate of the liquid equalizing frame (9), and multiple sets of overflow tubes (10) are evenly distributed on the packing filter layer (11) directly above the . 4. A method for purifying desulfurization wastewater from a thermal power plant according to claim 1, characterized in that: the filter box (8) and the reaction tank (14) are connected through a connecting pipe (13), and the reaction tank ( A waste liquid outlet pipe (16) is installed at the bottom of 14), and an overflow outlet pipe (15) is installed on the upper right side of the reaction tank (14), and a water pump is installed on the overflow outlet pipe (15). 5. A method for purifying desulfurization wastewater from a thermal power plant according to claim 1, characterized in that: the reaction tank (14) is equipped with a feeding pipe, and the first rotating shaft (17) inside the reaction tank (14) and A plurality of groups of stirring blades (18) are evenly welded and fixed on the second rotating shaft (19), and grooves (20) are provided at the ends of the stirring blades (18). 6. A method for purifying desulfurization wastewater from a thermal power plant according to claim 1, characterized in that: the first pulley (21) and the second pulley (22) are connected by a V-belt, and the second The rotating shaft of two belt pulleys (22) is fixedly connected with the output shaft of reduction motor (23) by shaft coupling, and reduction motor (23) is fixed on the vertical frame (12) outer side wall by support simultaneously. 7. A method for purifying desulfurization wastewater from a thermal power plant according to claim 5, characterized in that: the stirring blade (18) is evenly positioned along the outer circumferential direction of the first rotating shaft (17) and the second rotating shaft (19) There are four groups, and the section of the stirring blade (18) is spoon-shaped.

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