CN213388168U - Zero discharging equipment of thermal power plant's desulfurization waste water - Google Patents

Abstract

The utility model discloses a zero discharging equipment of thermal power plant's desulfurization waste water, include water inlet, filter equipment, waste water collecting pit, one-level flocculation basin, second grade flocculation basin, depositing reservoir and the low level clean water basin that communicates in proper order through the pipeline along waste water rivers direction, the bottom of depositing reservoir is higher than the top of low level clean water basin, and is equipped with the electricity generation subassembly between depositing reservoir and the low level cistern. The utility model has the advantages of small volume, small occupied area, no need of external flocculating agent, good environmental protection performance and low cost.

Description

Zero discharging equipment of thermal power plant's desulfurization waste water

Technical Field

The utility model relates to a thermal power energy saving and emission reduction technical field, concretely relates to desulfurization waste water zero discharge apparatus of thermal power plant.

Background

The desulfurization waste water mainly comes from a gypsum dehydration and cleaning system, or overflow water of a hydrocyclone and filtrate of a belt filter press, and is a necessary process link for maintaining the material balance of a slurry circulating system of a desulfurization device, controlling the content of a soluble part (namely Cl-) in limestone slurry and ensuring the quality of gypsum. The waste water contains various substances, which are mainly divided into chloride, fluoride, high-concentration sulfite, suspended matters, sulfate, a small amount of heavy metal ions (such as Pb2+, Cr2+, and the like), ammonia nitrogen, and the like, and is one of the most difficult tail end waste waters to be treated in thermal power plants. According to the environmental protection policy of intensive release of the state government, the ecological environment protection work is highly emphasized by the center of the party and the state government, the pressure of water consuming households of industrial enterprises on the aspects of water resource restriction and emission limitation is increased suddenly, and the achievement of deep water saving and zero discharge of waste water is accelerated, so that the method becomes a necessary choice for each industrial enterprise.

SUMMERY OF THE UTILITY MODEL

For solving the problem that above-mentioned prior art exists, the utility model aims to provide a desulfurization waste water zero release device of thermal power plant that environmental protection performance is good, with low costs.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

zero discharge apparatus of thermal power plant's desulfurization waste water includes water inlet, filter equipment, waste water collecting tank, one-level flocculation basin, second grade flocculation basin, depositing reservoir and the low level clean water basin that communicates in proper order through the pipeline along waste water rivers direction, the bottom of depositing reservoir is higher than the top in low level clean water basin, and is equipped with the electricity generation subassembly between depositing reservoir and the low level cistern, the gravitational potential energy of electricity generation subassembly internal water converts the electric energy into.

Furthermore, the filtering device is sand filtering equipment, and the bottom of the filtering device is a sludge discharge port.

Furthermore, the filtering material at the lower part in the filtering device is a garnet filtering material with the diameter of 1-2mm, and the filtering material at the upper part is a garnet filtering material with the diameter of 0.5-1 mm.

Further, the heavy metal ion of pond aquatic is got rid of through electrolytic flocculation to one-level flocculation basin, be equipped with in the one-level flocculation basin electrocoagulation reactor I and provide the power I of electric power, its anode material is iron or aluminium.

Further, the chlorine ions in the water in the secondary flocculation tank are removed through electrolytic flocculation, an electric flocculation reactor II and a power supply II for supplying electric power are arranged in the primary flocculation tank, and the anode material of the primary flocculation tank is made of inert materials.

Furthermore, stirring impellers driven by a speed reduction motor are arranged at the bottoms of the first-stage flocculation tank and the second-stage flocculation tank.

Further, the mud discharging port has also been seted up to the bottom in one-level flocculation basin and second grade flocculation basin, and above-mentioned mud discharging port all connects in the pressure filter, all is provided with the sludge pump on the connecting tube of above-mentioned mud discharging port department.

Further, a filtrate outlet of the filter press is connected with a water inlet of the wastewater collection pool.

Furthermore, the power generation assembly comprises a small turbine generator, the small turbine generator is sequentially connected with a rectifier, a storage battery and a power source I in series, and the power source I is connected with a power source II in parallel.

The utility model discloses following beneficial effect has:

1. the utility model adopts the modes of filtering, flocculating and settling to treat substances such as suspended solid, heavy metal ions and chloride ions in the desulfurization wastewater, so that the desulfurization wastewater reaches the discharge standard, and the gravitational potential energy of the treated clear water is converted into electric energy, thereby saving energy and protecting environment; the desulfurization waste water discharge device of the utility model has the advantages of small volume, small occupied area, no need of external flocculating agent, good environmental protection performance and low cost;

2. selecting sand filtering equipment to pretreat the wastewater, and controlling the granularity of garnet filter materials to enable the garnet filter materials to be different according to natural gravity of specific gravity to form a plurality of horizontal layers which are gradually thinned from bottom to top so as to remove floccules in the water;

3. waste water flows through the first-level flocculation tank, and the heavy metal ions and OH ions are combined to form insoluble substances to be separated out through electrolysis and chemical reaction, so that chloride ions in the waste water are removed in the second-level flocculation tank, and finally, solid and floccules are settled in the clarification tank, so that the treatment link is simple and efficient, the use of chemical agents is reduced, and the cost is saved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Reference numerals: 1. a water inlet; 2. a filtration device; 21. filtering garnet; 3. a wastewater collection tank; 4. a primary flocculation tank; 41. an electrocoagulation reactor I; 42. a power supply I; 5. a secondary flocculation tank; 51. an electrocoagulation reactor II; 52. a power supply II; 6. a clarification tank; 7. a low level clean water tank; 8. a power generation assembly; 81. a small turbine generator; 82. a rectifier; 83. a storage battery; 9. a sludge discharge port; 91. a sludge discharge pump; 10. a stirring impeller; 11. and (4) a filter press.

Detailed Description

The technical solution of the present invention will be described clearly and completely through the following detailed description.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through an intermediate medium, or they may be connected through the inside of two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Combine figure 1 to show, desulfurization waste water zero discharge apparatus of thermal power plant, include along waste water rivers direction water inlet 1 that the pipeline communicates in proper order, filter equipment 2, waste water collecting pit 3, one-level flocculation basin 4, second grade flocculation basin 5, depositing reservoir 6 and low level clean water basin 7, the bottom of depositing reservoir 6 is higher than the top of low level clean water basin 7, and is equipped with power generation component 8 between depositing reservoir 6 and the low level cistern, power generation component 8 converts the gravitational potential energy of 6 internal waters of depositing reservoir into the electric energy.

Further, the filtering device 2 is a sand filtering device, and the bottom of the filtering device is provided with a sludge discharge port 9.

Furthermore, the lower filter material in the filter device 2 is a garnet filter material 21 with the diameter of 1-2mm, and the upper filter material is the garnet filter material 21 with the diameter of 0.5-1 mm.

Further, heavy metal ions in the pond aquatic are got rid of through electrolytic flocculation to one-level flocculation basin 4, are equipped with electric flocculation reactor I41 and power I42 that provides electric power in the one-level flocculation basin 4, and electric flocculation reactor I41 adopts tubular single-stage high frequency pulse electric flocculation reactor, and its anode material is iron.

Further, the second-stage flocculation tank 5 removes chloride ions in water in the tank through electrolytic flocculation, an electric flocculation reactor II 51 and a power supply II 52 for supplying power are arranged in the first-stage flocculation tank 4, and the anode material of the first-stage flocculation tank is made of inert materials.

Further, the bottom of the first-stage flocculation tank 4 and the bottom of the second-stage flocculation tank 5 are both provided with stirring impellers 10 driven by a speed reduction motor.

Further, a sludge discharge port 9 is also formed in the bottoms of the first-stage flocculation tank 4 and the second-stage flocculation tank 5, the sludge discharge ports 9 are connected to the filter press 11, and a sludge discharge pump 91 is arranged on a connecting pipeline at the sludge discharge port 9.

Further, a filtrate outlet of the filter press 11 is connected with a water inlet 1 of the waste water collecting tank 3.

Further, the power generation assembly 8 comprises a small turbine generator 81, the small turbine generator 81 is sequentially connected with a rectifier 82, a storage battery 83 and a power supply I42 in series, and the power supply I42 is connected with a power supply II 52 in parallel.

Example 2

The difference between the present embodiment and embodiment 1 is that the anode material of the electrocoagulation reactor i 41 is aluminum, and the rest of the technical features are the same as those of embodiment 1, and are not described herein.

The working principle is as follows:

the wastewater flows through the sand filtration equipment from the water inlet 1, enters the wastewater collection tank 3 after being subjected to suspended matter removal, and then flows through the primary flocculation tank 4 and the secondary flocculation tank 5 in sequence to sequentially remove heavy metal ions and chloride ions in the wastewater. In the primary flocculation tank 4, after the anode of the electric flocculation reactor I41 is electrified with direct current, the anode loses electrons to form metal cations, and the metal cations and OH-in the solution generate a metal hydroxide colloid flocculant with strong adsorption capacity, so that pollutants in the wastewater are adsorbed, co-precipitated and removed; in second grade flocculation basin 5, the chloride ion in the desulfurization waste water is detached to electricity flocculation reactor II 51, also can prevent that waste water from producing the corrosion reaction to follow-up pipeline or equipment, the flocculation material that generates in two flocculation basins flows out through mud discharging port 9, the supernatant fluid gets into clarification tank 6, the flocculation thing deposit is in the bottom and through gravity concentration mud, upper portion is then the water purification, the water purification is carried to low level clean water basin 7 in, because of there is the difference in height between two ponds, waste water flows in small-size turbine hydroelectric generator along the pipeline in succession, the rotation of stable drive turbine drives the generator electricity generation. The current generated by the small turbine generator 81 is rectified by the rectifier 82 and then is transmitted to the storage battery 83 to supply power for the two electrocoagulation reactors; sludge at the bottom of the clarification tank 6 is conveyed to a filter press 11 from a sludge discharge port 9 for filter pressing dehydration, filter liquor of filter pressing flows back to the wastewater collection tank 3, and filter-pressed sludge is convenient for uniform treatment.

The above-mentioned embodiments are only described as the preferred embodiments of the present invention, and are not intended to limit the concept and scope of the present invention, and the technical content of the present invention, which is claimed by the present invention, is fully recorded in the technical claims.

Claims (9)

1. Zero discharge apparatus of thermal power plant's desulfurization waste water, its characterized in that includes water inlet (1), filter equipment (2), waste water collecting pit (3), one-level flocculation basin (4), second grade flocculation basin (5), depositing reservoir (6) and low level clean water basin (7) that communicate in proper order through the pipeline along waste water rivers direction, the bottom of depositing reservoir (6) is higher than the top of low level clean water basin (7), and is equipped with between depositing reservoir (6) and the low level cistern and generates electricity subassembly (8), the gravitational potential energy of generating electricity subassembly (8) with depositing reservoir (6) internal water converts the electric energy into.

2. The zero discharge device for desulfurization waste water of thermal power plant according to claim 1, characterized in that the filtering device (2) is a sand filtering device, and the bottom of the filtering device is a sludge discharge port (9).

3. The zero discharge device of desulfurization waste water in a thermal power plant as claimed in claim 2, characterized in that the lower filter material in the filter device (2) is garnet filter material (21) with a diameter of 1-2mm, and the upper filter material is garnet filter material (21) with a diameter of 0.5-1 mm.

4. The zero discharge device for desulfurization wastewater in a thermal power plant as claimed in claim 1, wherein the primary flocculation tank (4) removes heavy metal ions in the water in the tank through electrolytic flocculation, an electric flocculation reactor I (41) and a power supply I (42) for supplying electric power are arranged in the primary flocculation tank (4), and the anode material of the electric flocculation reactor I is iron or aluminum.

5. The zero discharge device for desulfurization wastewater in a thermal power plant as claimed in claim 1, wherein the secondary flocculation tank (5) removes chloride ions in water in the tank through electrolytic flocculation, an electric flocculation reactor II (51) and a power supply II (52) for supplying power are arranged in the primary flocculation tank (4), and the anode material of the electric flocculation reactor II is made of inert materials.

6. The zero discharge device for desulfurization wastewater of a thermal power plant according to claim 4 or 5, characterized in that the bottom of the primary flocculation tank (4) and the bottom of the secondary flocculation tank (5) are both provided with stirring impellers (10) driven by a speed reduction motor.

7. The zero discharge device for desulfurization wastewater of a thermal power plant according to claim 4 or 5, characterized in that sludge discharge ports (9) are also formed at the bottoms of the primary flocculation tank (4) and the secondary flocculation tank (5), the sludge discharge ports (9) are connected to a filter press (11), and sludge discharge pumps (91) are arranged on connecting pipelines at the sludge discharge ports (9).

8. The zero discharge device for desulfurization waste water of thermal power plant according to claim 7, characterized in that the filtrate outlet of the filter press (11) is connected with the water inlet (1) of the waste water collecting tank (3).

9. The zero discharge device for desulfurization waste water of a thermal power plant according to claim 4 or 5, characterized in that the power generation assembly (8) comprises a small turbine generator (81), the small turbine generator (81) is sequentially connected in series with a rectifier (82), a storage battery (83) and a power supply I (42), and the power supply I (42) is connected in parallel with a power supply II (52).

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