CN215250213U - System for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas - Google Patents
System for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas Download PDFInfo
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- CN215250213U CN215250213U CN202121694451.1U CN202121694451U CN215250213U CN 215250213 U CN215250213 U CN 215250213U CN 202121694451 U CN202121694451 U CN 202121694451U CN 215250213 U CN215250213 U CN 215250213U
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Abstract
The utility model discloses an utilize system of low temperature flue gas concentration neutralization desulfurization waste water, contain the concentration tower, connect in the desulfurization waste water feeder at concentration tower top, connect in the flue of concentration tower one side, connect flue gas between flue and concentration tower and advance pipe and flue gas exit tube, connect in the first discharge pump of dense thick liquid of concentration tower bottom one side, connect in the terminal quenching and tempering of the first discharge pump of dense thick liquid and case, connect in the quenching and tempering with the dense thick liquid second discharge pump of bottom of the case opposite side, connect in the terminal quenching and tempering clarification tank of dense thick liquid second discharge pump and connect respectively in the sludge collector of quenching and tempering clarification tank exit and contain salt thick liquid discharge apparatus. The utility model realizes concentration and reduction by the waste heat of low-temperature flue gas, and can effectively reduce the low cost, energy conservation and consumption reduction of the desulfurization wastewater during water reduction; through the setting of the tempering and neutralizing box, the subsequent solid-liquid separation and harmless recycling are facilitated.
Description
Technical Field
The utility model belongs to the technical field of the construction, in particular to utilize concentrated neutralization desulfurization waste water's of low temperature flue gas system.
Background
With the enhancement of the treatment of water pollution in China, the requirement of zero discharge of wastewater of the whole plant is put forward especially for power plants. The external wastewater discharge of the coal-fired power plant mainly comprises circulating sewage, fine treatment strong brine and wet desulphurization wastewater, wherein the wet desulphurization wastewater is the wastewater with the worst water quality, has the characteristics of high salt content, high chlorine content, high hardness, large fluctuation caused by coal quality and the like, and is a key point for realizing the wastewater zero discharge of the whole plant.
The desulfurization wastewater of the current coal-fired power plant mainly adopts the technologies of thermal method concentration drying, membrane method concentration drying, direct drying and the like, but has a series of problems when being applied to the coal-fired power plant: the membrane method has large dosage for concentration, drying and softening, and the medicament cost is high; the comprehensive cost of the thermal method concentration and drying is low, but a high-grade heat source still needs to be consumed; the direct drying completely consumes high-grade heat sources, and the wastewater treatment cost is too high. The wet desulphurization wastewater zero discharge technology has high operation cost, which is usually 40-120 yuan/ton, and brings heavy economic burden to a coal-fired power plant, so that the development of a low-energy-consumption and low-cost desulphurization wastewater concentration and neutralization technology is a necessary trend for realizing wastewater treatment of the coal-fired power plant.
SUMMERY OF THE UTILITY MODEL
The utility model provides an utilize system of concentrated neutralization desulfurization waste water of low temperature flue gas for but solve the cyclic utilization of concentration, concentrated neutralization process of desulfurization waste water low cost and low energy consumption and be convenient for construction and detect technical problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an utilize system of concentrated neutralization desulfurization waste water of low temperature flue gas, contain the concentration tower, connect in the desulfurization waste water feed ware at concentration tower top, connect in the flue of concentration tower one side, connect flue gas between flue and concentration tower and advance pipe and flue gas exit tube, connect in the first discharge pump of dense thick liquid of concentration tower bottom one side, connect in the terminal quenching and tempering of the first discharge pump of dense thick liquid and the case, connect in the quenching and tempering with the dense thick liquid second discharge pump of bottom of the case opposite side, connect in the terminal quenching and tempering clarification tank of dense thick liquid second discharge pump and connect respectively in the mud collector of quenching and tempering clarification tank exit and contain salt thick liquid discharge apparatus.
Further, concentrated slurry is stored at the bottom of the concentration tower, and the concentrated slurry and a neutralizer in the tempering neutralization box are neutralized into neutral slurry correspondingly.
Further, the neutralizing agent is slaked lime.
Further, the flue gas inlet pipe is connected to the bottom of the concentration tower, and the flue gas inlet pipe is also connected with a booster fan; the temperature of the flue gas in the flue gas inlet pipe is 90-150 ℃.
Further, the flue gas exit tube is connected to the top of the concentration tower, the flue gas in the flue gas exit tube is wet flue gas, and the flue gas temperature is not higher than 55 ℃.
Furthermore, two spraying layers are vertically arranged in the concentration tower, and are respectively correspondingly matched with two external circulating pumps, and a demister layer is correspondingly arranged.
Furthermore, a pulse suspension spraying layer is arranged in the middle of the interior of the concentrating tower and is connected with the outlet of the first discharge pump of the concentrated slurry.
Further, the salt slurry discharging equipment comprises a salt slurry discharging pipeline connected with the middle upper part of the tempering and clarification tank and a salt slurry collector connected to the tail end of the salt slurry discharging pipeline.
Further, still be provided with detection device on the first discharge pump connecting tube, detection device corresponds concentrated thick liquid and is provided with PH sensor and water content detector.
Further, a solid detection device is arranged in the sludge collector, and the sludge solid content of the sludge collector is not less than 30%.
The beneficial effects of the utility model are embodied in:
1) the utility model realizes concentration and reduction by the waste heat of low-temperature flue gas, and can effectively reduce the low cost, energy conservation and consumption reduction of the desulfurization wastewater during water reduction;
2) the utility model is beneficial to the subsequent solid-liquid separation and harmless recycling through the arrangement of the tempering neutralization box;
3) the utility model can differentially recover the solid substance and carry out the next treatment of the salt-containing slurry through the combined arrangement of the conditioning clarification tank, the sludge collector and the salt-containing slurry discharge equipment; fine division of labor is facilitated;
in addition, each step can be effectively controlled by the arranged detection device; and the wet flue gas of the low-temperature flue gas after passing through the concentration tower can enter the flue again for reutilization; additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.
Drawings
FIG. 1 is a schematic diagram of a concentration neutralization system connection.
Reference numerals: the method comprises the following steps of 1-desulfurization wastewater feeder, 2-concentration tower, 3-circulating pump, 4-flue, 5-flue gas inlet pipe, 6-booster fan, 7-flue gas outlet pipe, 8-concentrated slurry, 9-concentrated slurry first discharge pump, 10-slaked lime, 11-conditioning neutralization box, 12-concentrated slurry second discharge pump, 13-conditioning clarification tank, 14-sludge collector and 15-salt-containing slurry discharge equipment.
Detailed Description
Taking a desulfurization wastewater treatment device of a certain 1000MW coal-fired unit as an example, 15 tons/hour of desulfurization wastewater is designed, wherein the solid content of the wastewater is 0.5%, the pH value is 5-6, the density is 1030kg/m3, and the chloride ion concentration is 20000 mg/L. The system is applied, and untreated desulfurization waste water directly enters a concentration and neutralization system for treatment.
As shown in fig. 1, a system for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas comprises a concentration tower 2, a desulfurization wastewater feeder 1 connected to the top of the concentration tower 2, a flue 4 connected to one side of the concentration tower 2, a flue gas inlet pipe 5 and a flue gas outlet pipe 7 connected between the flue 4 and the concentration tower 2, a first thick slurry discharge pump 9 connected to one side of the bottom of the concentration tower 2, a first conditioning neutralization tank 11 connected to the tail end of the first thick slurry discharge pump 9, a second thick slurry discharge pump 12 connected to the other side of the bottom of the conditioning neutralization tank 11, a conditioning clarification tank 13 connected to the tail end of the second thick slurry discharge pump 12, and a sludge collector 14 and a salt-containing slurry discharge device 15 respectively connected to the outlet of the conditioning clarification tank 13.
In this embodiment, the bottom of the concentration tower 2 is stored with concentrated slurry 8, the concentrated slurry 8 and a neutralizer in the tempering and neutralizing tank 11 are neutralized into neutral slurry, and the neutralizer is slaked lime 10.
In the embodiment, the flue gas inlet pipe 5 is connected to the bottom of the concentration tower 2, and the flue gas inlet pipe 5 is also connected with a booster fan 6; the temperature of the flue gas in the flue gas inlet pipe 5 is 90-150 ℃. The flue gas exit tube 7 is connected to the top of the concentration tower 2, the flue gas in the flue gas exit tube 7 is wet flue gas, and the flue gas temperature is not higher than 55 ℃.
In this embodiment, arrange two-layer on the vertical in the concentration tower 2 and spray the layer and correspond two external circulating pumps 3 of supporting respectively to correspond and be provided with the one deck defroster. The middle part in the concentration tower 2 is provided with a pulse suspension spraying layer which is connected with the outlet of the first discharge pump 9 of the thick slurry.
In this embodiment, the salt slurry discharge apparatus includes a salt slurry discharge pipe connected to the middle upper portion of the thermal refining clarifier 13 and a salt slurry collector connected to the end of the salt slurry discharge pipe. Still be provided with detection device on the first discharge pump connecting tube, detection device corresponds concentrated thick liquid 8 and is provided with PH sensor and water content detector.
Referring to fig. 1, a system for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas is further described in detail, and the specific steps are as follows:
step one, introducing low-temperature flue gas at the temperature of 90-150 ℃ into a flue 4, using the waste heat of the low-temperature flue gas as a heat source, increasing the low-temperature flue gas by a booster fan 6, then introducing the increased low-temperature flue gas into a concentration tower 2 through a flue gas inlet pipe 5, and evaporating and concentrating the wastewater slurry in the concentration tower 2.
Secondly, the gas flow velocity in the concentration tower 2 is not more than 4m/s, and the flue gas temperature at a flue gas outlet pipe 7 is not higher than the wet saturated flue gas with the temperature of 55 ℃; a demister is arranged at the top in the concentration tower 2, so that the carrying amount of liquid drops at a wet flue gas outlet is reduced; wherein the concentration tower 2 is made of round glass fiber reinforced plastic materials.
Thirdly, the concentrated slurry 8 in the concentration tower 2 washes HCl in the flue gas, the pH value is 0-2, the chloride ion concentration is 100-300 g/L, the salt content is 300-600 g/L, and the density is 1050-1300 kg/m 3; enabling untreated desulfurization wastewater to enter a concentration tower 2, and realizing circulating spraying through a circulating pump 3 and a spraying layer in the concentration tower 2; the evaporation concentration decrement is realized in a spraying and washing mode, the cooled wet flue gas passes through a demister and then returns to a flue 4 in front of a desulfurizing tower, and the concentrated slurry 8 is formed after the waste water decrement is 80-90%.
Discharging the concentrated slurry 8 at the bottom of the concentration tower 2 through a concentrated slurry first discharge pump 9 and entering a conditioning neutralization box 11, wherein slaked lime 10 solid powder is adopted as a neutralizer in the conditioning neutralization box 11, and the pH value of the neutralized slurry is 7-13; wherein, still be provided with detection device on first discharge pump connecting tube, concentrated thick liquid 8's parameter is not conform to discharge standard and then through drenching the circulation and using.
After the quenching and tempering neutralization box 11 is neutralized, the sludge enters a quenching and tempering clarification tank 13 through a second concentrated slurry discharge pump 12, and the sludge and the salt-containing slurry are respectively discharged after solid-liquid separation, wherein the sludge is intensively treated through a sludge collector 14 at the bottom of the quenching and tempering clarification tank 13, and the salt-containing slurry enters a drying system through salt-containing slurry discharge equipment 15 and is treated; a solid detection device is arranged in the sludge collector 14, and the solid content of the sludge after solid-liquid separation is 30-70%; the salt-containing slurry contains 1-5% of solid and has a density of 1050-1200 kg/m 3.
In addition, the salt-containing slurry is gathered in a salt-containing slurry collector through a salt-containing slurry discharge pipeline, then the dried solid exists in a powder state with the granularity of 5-100 mu m to form salt-containing dust, and the salt-containing dust enters the dry slag for recycling.
The connections referred to in this embodiment are connections in a broad sense, and may refer to either soft connections or hard links; can be combined with the detachable connection, the rotary connection and the fixed connection in the actual construction. The related equipment and components are all universal equipment and components except for the specific design; and adjusting the application of the general equipment and component parameters according to the actual situation.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be considered by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides an utilize concentrated system of neutralizing desulfurization waste water of low temperature flue gas, a serial communication port, contain concentration tower (2), connect in desulfurization waste water feeder (1) at concentration tower (2) top, connect in flue (4) of concentration tower (2) one side, flue gas that connects between flue (4) and concentration tower (2) advances pipe (5) and flue gas exit tube (7), connect in the first discharge pump (9) of dense thick liquid of concentration tower (2) bottom one side, connect in the terminal quenching and tempering neutralization case (11) of the first discharge pump (9) of dense thick liquid, connect in the dense thick liquid second discharge pump (12) of quenching and tempering case (11) bottom opposite side, connect in the terminal clarification tank (13) of dense thick liquid second discharge pump (12) and connect sludge collector (14) and the salt-containing thick liquid discharge apparatus (15) in quenching and tempering tank (13) exit respectively.
2. The system for concentrating, neutralizing and desulfurizing waste water by using low-temperature flue gas as claimed in claim 1, wherein the bottom of the concentration tower (2) stores concentrated slurry (8), and the concentrated slurry (8) and the neutralizer in the modified neutralization tank (11) are neutralized into neutral slurry correspondingly.
3. The system for concentrating and neutralizing desulfurized wastewater using low temperature flue gas according to claim 2, wherein said neutralizing agent is slaked lime (10).
4. The system for concentrating, neutralizing and desulfurizing waste water by using low-temperature flue gas as claimed in claim 1, wherein the flue gas inlet pipe (5) is connected to the bottom of the concentration tower (2), and the flue gas inlet pipe (5) is further connected with a booster fan (6); the temperature of the flue gas in the flue gas inlet pipe (5) is 90-150 ℃.
5. The system for concentrating, neutralizing and desulfurizing wastewater by using low-temperature flue gas as claimed in claim 1, wherein the flue gas outlet pipe (7) is connected to the top of the concentration tower (2), the flue gas in the flue gas outlet pipe (7) is wet flue gas, and the temperature of the flue gas is not higher than 55 ℃.
6. The system for concentrating, neutralizing and desulfurizing wastewater by using low-temperature flue gas as claimed in claim 1, wherein two spraying layers are vertically arranged in the concentrating tower (2), and are respectively correspondingly matched with two external circulating pumps (3), and a demister is correspondingly arranged.
7. The system for concentrating, neutralizing and desulfurizing waste water by using low-temperature flue gas as claimed in claim 1, wherein a pulse suspension spraying layer is arranged at the middle part in the concentrating tower (2), and the pulse suspension spraying layer is connected with the outlet of the first discharge pump (9) of the dense slurry.
8. The system for concentrating, neutralizing and desulfurizing wastewater by using low-temperature flue gas according to claim 1, wherein the salt slurry discharging means comprises a salt slurry discharging pipe connected to the middle upper portion of the temper clarifier (13) and a salt slurry collector connected to the end of the salt slurry discharging pipe.
9. The system for concentrating, neutralizing and desulfurizing waste water by using low-temperature flue gas as claimed in claim 1, wherein the first discharge pump connecting pipe is further provided with a detection device, and the detection device is provided with a pH sensor and a water content detector corresponding to the concentrated slurry (8).
10. The system for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas as claimed in claim 1, wherein a solid detection device is arranged in the sludge collector (14), and the sludge solid content of the sludge collector (14) is not less than 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121694451.1U CN215250213U (en) | 2021-07-26 | 2021-07-26 | System for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121694451.1U CN215250213U (en) | 2021-07-26 | 2021-07-26 | System for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas |
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| Publication Number | Publication Date |
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| CN215250213U true CN215250213U (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121694451.1U Active CN215250213U (en) | 2021-07-26 | 2021-07-26 | System for concentrating and neutralizing desulfurization wastewater by using low-temperature flue gas |
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| CN (1) | CN215250213U (en) |
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- 2021-07-26 CN CN202121694451.1U patent/CN215250213U/en active Active
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