CN216711798U - Desulfurization wastewater treatment system - Google Patents
Desulfurization wastewater treatment system Download PDFInfo
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- CN216711798U CN216711798U CN202220230866.1U CN202220230866U CN216711798U CN 216711798 U CN216711798 U CN 216711798U CN 202220230866 U CN202220230866 U CN 202220230866U CN 216711798 U CN216711798 U CN 216711798U
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Abstract
The utility model discloses a desulfurization wastewater treatment system.A water inlet of a sewage pump is connected with a water collecting tank, and a water outlet of the sewage pump is connected with a water inlet of a primary sedimentation tank; the delivery port of the primary sedimentation tank is connected with the water inlet of the medicament mixing tank, the delivery port of the medicament mixing tank is connected with the water inlet of the lift pump, the delivery port of the lift pump is connected with the water inlet of the cyclone clarifier 4, the delivery port of the cyclone clarifier is connected with the water inlet of the valveless filter, the delivery port of the valveless filter is connected with the water inlet of the reuse water tank, the discharge port of the dry powder feeder is connected with the water inlet of the medicament mixing tank, and the inlet of the sludge pump is connected with the sludge discharge pipe of the primary sedimentation tank and the sludge discharge pipe of the cyclone clarifier. The waste water treated by the method can reach the discharge standard DL/T997-2006 of limestone-gypsum wet desulphurization waste water quality control index of thermal power plants, and can be recycled.
Description
Technical Field
The utility model belongs to the technical field of wastewater treatment, and particularly relates to a desulfurization wastewater treatment system.
Background
The production and design of thermal power plants require the arrangement of a desulfurization device, and limestone/gypsum wet desulfurization is the most widely applied flue gas desulfurization process in various flue gas desulfurization processes. The waste water generated in the wet desulphurization process of the boiler flue gas by the limestone/gypsum method is derived from the discharge water of the absorption tower. In order to maintain the balance of the mass of the slurry circulation system of the desulfurization unit, prevent the soluble fraction of the flue gas, i.e., the chlorine concentration, from exceeding the specified value and ensure the quality of gypsum, a certain amount of waste water must be discharged from the system, which is mainly from the gypsum dewatering and cleaning system. The impurities contained in the wastewater mainly comprise suspended matters, supersaturated sulfite, sulfate and heavy metals, and many of the impurities are the first pollutants which are strictly controlled in environmental protection standards. Therefore, the desulfurization wastewater treatment becomes an environmental problem in the design, production and scientific research of a thermal power plant. The currently commonly adopted three-header (physical and chemical method) desulfurization wastewater treatment process has the defects of more configured equipment, larger investment, high operation cost and larger overhaul and maintenance amount of the equipment, the system generally causes the burden of facilities such as a clarifier, a sludge pump, a filter press and the like to be increased due to higher solid content after operating for a period of time, and a lime milk dosing system is blocked, so that the equipment failure rate is higher, and the wastewater treatment system can only be stopped, and other discharge modes are sought.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a desulfurization wastewater treatment system, wastewater treated by the system can reach the discharge standard DL/T997-2006 of limestone-gypsum wet desulfurization wastewater quality control index of thermal power plant, can be recycled, and solves the problems that the existing triple-header and common clarifier treatment process has more equipment, high operation and maintenance cost, high failure rate, low actual operation rate, no guarantee of treated effluent quality and the like.
The technical scheme of the utility model is as follows:
a desulfurization wastewater treatment system comprises a water collecting tank, a primary settling tank, a medicament mixing tank, a cyclone clarifier, a valveless filter, a reuse water tank, a sewage pump, a lift pump, a sludge pump and a dry powder adding machine, wherein the water inlet of the sewage pump is connected with the water collecting tank, and the water outlet of the sewage pump is connected with the water inlet of the primary settling tank; the water outlet of the primary sedimentation tank is connected with the water inlet of the medicament mixing tank, the water outlet of the medicament mixing tank is connected with the water inlet of the lift pump, the water outlet of the lift pump is connected with the water inlet of the cyclone clarifier, the water outlet of the cyclone clarifier is connected with the water inlet of the valveless filter, the water outlet of the valveless filter is connected with the water inlet of the reuse water tank, the discharge port of the dry powder feeder is connected with the water inlet of the medicament mixing tank, and the inlet of the sludge pump is connected with the sludge discharge pipe of the primary sedimentation tank and the sludge discharge pipe of the cyclone clarifier.
Preferably, the sewage pump adopts a submersible sewage pump, and the submersible sewage pump is arranged in the water collecting tank and is positioned at the middle upper part of the water collecting tank.
Preferably, the desulfurization wastewater treatment system further comprises a filter press, and an inlet of the filter press is connected with an outlet of the sludge pump.
Preferably, the water inlet and the water outlet of the primary sedimentation tank are both positioned at the upper part of the primary sedimentation tank, the water outlet of the primary sedimentation tank is positioned below the preset liquid level in the primary sedimentation tank, and the water outlet of the primary sedimentation tank is arranged at the position farthest from the water inlet.
Preferably, the sludge discharge pipe of the primary sedimentation tank is arranged at the bottom of the primary sedimentation tank.
Preferably, the bottom of the water collecting tank is provided with a stirrer and a drain outlet.
Preferably, a stirrer is arranged in the medicament mixing tank.
Preferably, valves are arranged on sludge discharge pipes of the primary sedimentation tank and the cyclone clarifier.
The utility model has the following beneficial effects:
the desulfurization wastewater treatment system is provided with the water collecting tank, wastewater discharged by the gypsum dehydration and cleaning system can be collected by utilizing the water collecting tank, the wastewater can be homogenized in water quality and water quantity in the water collecting tank and then is conveyed to the primary sedimentation tank through the sewage pump, the primary sedimentation tank carries out primary sedimentation on larger suspended matters in the wastewater, the treatment load of subsequent units is reduced, and the dosage is reduced. The outlet water of the primary sedimentation tank flows into the medicament mixing tank and is mixed with the dry powder medicament added into the medicament mixing tank by the dry powder adding machine, then the outlet water is conveyed to an inlet of the cyclone clarifier by the lifting pump, the water with low density displaces to the center of the shaft of the cyclone clarifier under the action of the centrifugal force in the cyclone clarifier, and then the water is discharged from an overflow port of the cyclone clarifier, the sludge with high density moves to the side wall of the cyclone clarifier, and finally the sludge is discharged from a bottom sludge pipe of the cyclone clarifier. The utility model adopts the cyclone clarifier and has the characteristics of good sedimentation effect, difficult blockage and small occupied area. The valveless filter is arranged behind the cyclone clarifier, suspended matters in water can be further filtered and removed by the valveless filter, the effluent quality is ensured to reach the standard, and the automatic back flushing is adopted, so that the energy is saved, and the degree of mechanization is high. The technical proposal shows that the desulfurization wastewater treatment system of the utility model adopts less equipment and belongs to equipment which is not easy to break down, thus having lower operation and maintenance cost and stable and reliable operation,
furthermore, the submersible sewage pump is arranged in the water collecting tank and is positioned at the middle upper part of the water collecting tank, so that the phenomenon that the inlet of the submersible sewage pump is blocked by sediment in the water collecting tank and the submersible sewage pump breaks down can be prevented.
Further, the sludge can be treated by the aid of the filter press, and the sludge can be treated as required after being subjected to filter-pressing dehydration through the filter press.
Furthermore, a water inlet and a water outlet of the primary sedimentation tank are both positioned at the upper part of the primary sedimentation tank, wherein the water inlet is arranged at the upper part and can prevent water from stirring the primary sedimentation tank by inflow water so as to stir the sludge at the bottom of the water; the water outlet of the primary sedimentation tank is positioned below the preset liquid level in the primary sedimentation tank, so that the water outlet can be prevented from being blocked by floating objects on the liquid level of the primary sedimentation tank; the delivery port of the primary sedimentation tank is arranged at the position farthest from the water inlet, so that the water can be prevented from being discharged from the delivery port after being fully precipitated.
Further, the bottom of catch basin is equipped with agitator and drain, utilizes halving the ware can prevent the interior deposit sediment of catch basin, and on the other hand can also make waste water quality of water can abundant homogeneity, sets up the drain and can be convenient for clear up when the deposit has the sediment in the catch basin.
Further, be equipped with the mixer in the medicament mixing tank, utilize the mixer to help medicament and waste water quick, homogeneous mixing.
Furthermore, valves are arranged on sludge discharge pipes of the primary sedimentation tank and the cyclone clarifier, and sludge generated by the primary sedimentation tank and the cyclone clarifier can be periodically discharged by utilizing the valves.
Drawings
FIG. 1 is a block diagram showing the construction of a desulfurization waste water treatment system according to the present invention;
in the figure, 1-a water collecting tank, 2-a primary settling tank, 3-a medicament mixing tank, 4-a cyclone clarifier, 5-a valveless filter, 6-a reuse water tank, 7-a filter press, 8-a submersible sewage pump, 9-a lift pump, 10-a sludge pump and 11-a dry powder feeder.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 1, the desulfurization wastewater treatment system comprises a water collecting tank 1, a primary sedimentation tank 2, a medicament mixing tank 3, a cyclone clarifier 4, a valveless filter 5, a reuse water tank 6, a filter press 7, a submersible sewage pump 8, a lift pump 9, a sludge pump 10 and a dry powder adding machine 11, wherein the bottom of the water collecting tank 1 is provided with a stirrer and a sewage discharge outlet, the submersible sewage pump 8 is arranged in the water collecting tank 1 and positioned at the middle upper part of the water collecting tank 1, and a water outlet of the submersible sewage pump 8 is connected with a water inlet of the primary sedimentation tank 2; the water inlet and the water outlet of the primary sedimentation tank 2 are both positioned at the upper part of the primary sedimentation tank 2, the water outlet of the primary sedimentation tank 2 is positioned below the preset liquid level in the primary sedimentation tank 2, the water outlet of the primary sedimentation tank 2 is arranged at the position farthest from the water inlet, the sludge discharge pipe of the primary sedimentation tank 2 is arranged at the bottom of the primary sedimentation tank 2, and the sludge discharge pipe of the primary sedimentation tank 2 is provided with a first valve; the delivery port of just heavy pond 2 is connected with the water inlet that the pond 3 was mixed to the medicament, be equipped with the mixer in the pond 3 was mixed to the medicament, the delivery port of medicament mixed pond 3 is connected with the water inlet of elevator pump 9, the delivery port of elevator pump 9 is connected with the water inlet of cyclone clarifier 4, the delivery port of cyclone clarifier 4 is connected with the water inlet of valveless filter 5, be equipped with the second valve on the mud pipe of cyclone clarifier 4, the delivery port of valveless filter 5 is connected with the water inlet of reuse pond 6, the discharge gate of throwing machine 11 is thrown to dry powder is connected with the water inlet of medicament mixed pond 3, the mud pipe of the access connection of sludge pump 10 just heavy pond 2 and the mud pipe of cyclone clarifier 4, the export of sludge pump 10 and the access connection of pressure filter 7.
The process for treating desulfurization waste water using the desulfurization waste water treatment system of the present invention as described above includes:
pretreatment: the desulfurization wastewater discharged from the gypsum dehydration and cleaning system is collected into a water collecting tank 1, the water collecting tank 1 has the function of homogenizing water quality and water quantity, the wastewater in the water collecting tank 1 is lifted to a primary sedimentation tank 2 through a submersible sewage pump 8, the wastewater is subjected to solid-liquid separation in the primary sedimentation tank 2 for the first time, and larger granular impurities in the water are removed.
Efficient precipitation: the supernatant of the primary sedimentation tank 2 automatically flows to the agent mixing tank 3, the dry powder adding machine 11 automatically adds the special high-efficiency composite water treatment agent for the desulfurization wastewater to the water inlet of the agent mixing tank 3, the lift pump 9 pressurizes the effluent of the agent mixing tank 3 and sends the effluent into the water inlet of the cyclone clarifier 4, the sewage added with the agent is subjected to solid-liquid separation in the cyclone clarifier 4 through centrifugal force, under the action of internal centrifugal force, the water with low density moves to the axial center of the cyclone clarifier 4 and is discharged from the overflow port of the cyclone clarifier 4, and the sludge with high density moves to the side wall of the cyclone clarifier 4 and is discharged from a sludge pipe at the bottom of the cyclone clarifier 4.
Deep filtration: the sewage in the cyclone clarifier 4 automatically flows into the valveless filter 5, the valveless filter 5 further removes fine suspended matters which are not removed by the cyclone clarifier 4, the quality of the outlet water is ensured to reach the standard, the inlet water of the valveless filter 5 is filtered from top to bottom and then enters the water storage tank, and the outlet water which passes through the valveless filter 5 after the water storage tank is full automatically flows into the reuse water tank 6. When the resistance reaches a preset value, siphoning action is generated to enable water to pass through the filter layer from bottom to top to perform backwashing on the filter material. Backwash water flows into the inter-facility trench into the sump.
Sludge treatment: the sludge outlets of the primary sedimentation tank 2 and the cyclone clarifier 4 are connected with the inlet of a sludge pump 10, and are lifted to a filter press 7 by the sludge pump to be pressed and treated according to the requirement.
In summary, the present invention has the following advantages:
1. the utility model designs the sewage collecting tank, the water quality and the water quantity of the sewage are homogenized in the collecting tank and are lifted to the primary sedimentation tank through the internal submersible sewage pump, and the primary sedimentation tank carries out primary sedimentation on larger suspended matters in the water, thereby reducing the treatment load of subsequent units and reducing the dosage.
2. The chemical adding equipment completely replaces the original triple box and the corresponding medicament storage, preparation and adding systems of lime milk, organic sulfur, composite iron salt and the like, and only one dry powder medicament (such as WEGREE F1000 high-efficiency composite water treatment agent, high-efficiency flocculant (desulfurization composite water treatment agent and water purifying agent) and GS-XNJ produced by Beijing Zhongdehuaxin company) is addedTM100 novel high-efficiency flocculating agent for the desulfurization wastewater), thereby achieving the effect of removing heavy metals, suspended matters, partial COD (chemical oxygen demand) and fluoride in the desulfurization wastewater. Has the characteristics of automatic dosing, short physicochemical reaction time, good solid-liquid separation effect, simple and convenient operation and high automation degree.
3. The clarifier of the utility model is different from the currently generally adopted vertical flow clarifier, and adopts a cyclone clarifier, so that the clarifier has good sedimentation effect, is not easy to block and occupies small area.
4. The clarifier is provided with a valveless filter, so that suspended matters in water can be further filtered and removed, the effluent quality is ensured to reach the standard, and the clarifier adopts automatic back flushing, so that the energy is saved, and the mechanization degree is high.
Claims (8)
1. A desulfurization wastewater treatment system is characterized by comprising a water collecting tank (1), a primary sedimentation tank (2), a medicament mixing tank (3), a cyclone clarifier (4), a valveless filter (5), a reuse water tank (6), a sewage pump, a lift pump (9), a sludge pump (10) and a dry powder adding machine (11), wherein a water inlet of the sewage pump is connected with the water collecting tank (1), and a water outlet of the sewage pump is connected with a water inlet of the primary sedimentation tank (2); the water outlet of the primary sedimentation tank (2) is connected with the water inlet of the medicament mixing tank (3), the water outlet of the medicament mixing tank (3) is connected with the water inlet of the lift pump (9), the water outlet of the lift pump (9) is connected with the water inlet of the cyclone clarifier (4), the water outlet of the cyclone clarifier (4) is connected with the water inlet of the valveless filter (5), the water outlet of the valveless filter (5) is connected with the water inlet of the reuse water tank (6), the discharge hole of the dry powder adding machine (11) is connected with the water inlet of the medicament mixing tank (3), and the inlet of the sludge pump (10) is connected with the sludge discharge pipe of the primary sedimentation tank (2) and the sludge discharge pipe of the cyclone clarifier (4).
2. The desulfurization wastewater treatment system according to claim 1, characterized in that the sewage pump employs a submersible sewage pump (8), and the submersible sewage pump (8) is disposed in the collecting tank (1) and located at the middle upper part of the collecting tank (1).
3. The desulfurization wastewater treatment system according to claim 1, further comprising a filter press (7), wherein an inlet of the filter press (7) is connected to an outlet of the sludge pump (10).
4. The desulfurization wastewater treatment system according to claim 1, wherein the water inlet and the water outlet of the primary sedimentation tank (2) are both located at the upper part of the primary sedimentation tank (2), the water outlet of the primary sedimentation tank (2) is located below a preset liquid level in the primary sedimentation tank (2), and the water outlet of the primary sedimentation tank (2) is arranged at the position farthest from the water inlet.
5. The desulfurization wastewater treatment system according to claim 1, wherein the sludge discharge pipe of the primary sedimentation tank (2) is provided at the bottom of the primary sedimentation tank (2).
6. The desulfurization wastewater treatment system according to claim 1, characterized in that the bottom of the water collecting tank (1) is provided with an agitator and a drain outlet.
7. The desulfurization wastewater treatment system according to claim 1, wherein a stirrer is provided in the chemical mixing tank (3).
8. The desulfurization wastewater treatment system according to claim 1, wherein valves are provided on the sludge discharge pipes of the primary sedimentation tank (2) and the cyclone clarifier (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220230866.1U CN216711798U (en) | 2022-01-27 | 2022-01-27 | Desulfurization wastewater treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220230866.1U CN216711798U (en) | 2022-01-27 | 2022-01-27 | Desulfurization wastewater treatment system |
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| CN216711798U true CN216711798U (en) | 2022-06-10 |
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| CN202220230866.1U Active CN216711798U (en) | 2022-01-27 | 2022-01-27 | Desulfurization wastewater treatment system |
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