CN210133954U - Continuous reactor for treating wet desulphurization wastewater - Google Patents
Continuous reactor for treating wet desulphurization wastewater Download PDFInfo
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- CN210133954U CN210133954U CN201920139732.7U CN201920139732U CN210133954U CN 210133954 U CN210133954 U CN 210133954U CN 201920139732 U CN201920139732 U CN 201920139732U CN 210133954 U CN210133954 U CN 210133954U
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Abstract
The utility model discloses a handle continuous type reactor of wet flue gas desulfurization waste water is applicable to all kinds of wet flue gas desulfurization waste water treatment process's technical field, aims at solving the problem that CODCr exceeds standard in the wet flue gas desulfurization waste water, is an integrated efficient continuous type reactor, provides the application foundation for desulfurization waste water treatment device. The continuous reactor comprises a first-stage air catalytic oxidation reaction zone, a catalytic oxidant reaction zone and a second-stage air catalytic oxidation reaction zone which are continuously arranged, and a plurality of reaction zones are connected in series for operation. The waste water inlet is arranged in the first-stage reaction area of the air catalytic oxidation, and the water outlet is arranged at the tail end of the second-stage reaction area of the air catalytic oxidation. Through the optimized combination of various oxidation modes, reaction conditions at all levels are controlled, the chemical reaction rate is improved, the reaction efficiency of each area is enhanced, and complete oxidation is realized. The utilization rate of oxygen supply equipment is improved, the dosage of the oxidant is reduced, and the energy consumption and the operation cost are saved in a sectional reaction mode.
Description
Technical Field
The utility model is suitable for a technical field of all kinds of wet flue gas desulfurization waste water treatment process is an integrated efficient continuous type reactor, provides the application foundation for desulfurization waste water treatment device.
Background
The wet flue gas desulfurization process is a main way for solving the problem of flue gas emission pollution in the industrial industry, has the characteristics of rich raw material sources, high desulfurization efficiency, reliable operation and the like, is widely applied in the world, and can generate a large amount of desulfurization wastewater in the production and operation processes.
Desulfurization waste water (desulfation waste water) refers to waste water discharged in a wet desulfurization process, and impurities contained in the waste water mainly comprise suspended matters, high-concentration inorganic salt and heavy metals and mainly come from flue gas and a desulfurizer.
With the increasing environmental problems and the stricter environmental requirements, the importance of desulfurization wastewater treatment is becoming a key problem in industrial design, production and scientific research.
At present, domestic research and production in the aspect have some defects, and the research institutions mainly aiming at the aspect are few; the integration level of the localization of the equipment is not enough; insufficient research on organic pollutant treatment and the like. In the desulfurization wastewater, the apparent chemical oxygen demand is different from that of the common wastewater, and the main factor for forming the chemical oxygen demand is not organic matters, but reduced inorganic matters, mainly sulfite.The substances have oxidability and reducibility, are mainly reducibility, are unstable in property, can pollute water bodies, and can release SO again after decomposition2. Therefore, the COD treatment process of desulfurization wastewater is different from the general biochemical treatment process. Oxidation of sulfite is an important chemical process, and aeration is a key element.
The domestic common desulfurization wastewater treatment adopts the process flow of 'pH adjustment, sedimentation, flocculation and clarification', the indexes of pH value, suspended matters, fluoride, heavy metals and the like of effluent can reach the discharge standard specified by the state, but COD in wastewater is not solvedCrAnd (5) exceeding the standard. And special systems such as evaporation concentration, reverse osmosis concentration, crystallization concentration and the like are adopted for processing part of projects, the system is complex, the investment and operation cost is high, the requirement on the operation management level is high, and the long-term stable operation of the system is difficult to realize.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the COD in the wet desulphurization waste waterCrThe problem of exceeding standards, and provides an economical and efficient processing device. The continuous reactor comprises a first-stage air catalytic oxidation reaction zone, a catalytic oxidant reaction zone and a second-stage air catalytic oxidation reaction zone which are continuously arranged, and a plurality of reaction zones are connected in series for operation. The air catalytic oxidation primary reaction zone plays a main oxidation role, aeration and filling are organically combined, and through optimizing the filling and cutting bubbles, the oxygenation efficiency is improved, the catalytic action is played, the reaction rate of sulfite and oxygen is accelerated, the oxidation efficiency is improved, the medium flow direction in the reactor is improved, and short flow is prevented; the oxidant catalytic reaction zone is arranged in series, and the oxidant is added into the zone to strengthen the oxidation effect, further remove other reducing substances in the wastewater, save the dosage of the medicament and eliminate the influence of ions in the wastewater on the reaction effect. The wastewater enters a secondary reaction zone of air catalytic oxidation to ensure complete oxidation of reductive substances such as sulfite and the like and reduce COD of the wastewaterCrAnd (4) concentration.
The utility model discloses an optimization combination of multiple oxidation mode improves chemical reaction rate, strengthens each regional reaction efficiency, realizes the complete oxidation. The utilization rate of oxygen supply equipment is improved, the dosage of the oxidant is reduced, and the energy consumption and the operation cost are saved in a sectional reaction mode. The continuous reactor integrates and arranges main units, saves intermediate connecting pipelines, saves occupied land, reduces capital investment and is convenient for operation and management.
The utility model discloses a realize through following technical scheme:
a continuous reactor for treating wet desulphurization wastewater is characterized in that the continuous reactor is an integrated treatment device and comprises a first-stage air catalytic oxidation reaction zone, an oxidant catalytic reaction zone and a second-stage air catalytic oxidation reaction zone which are continuously arranged. The waste water inlet is arranged in the first-stage reaction area of the air catalytic oxidation, and the water outlet is arranged at the tail end of the second-stage reaction area of the air catalytic oxidation.
The utility model relates to an application of a continuous reactor for treating wet desulphurization wastewater.
Preferably, the continuous reactor comprises a plurality of reaction zones in series.
Preferably, the material of the continuous reactor is glass fiber reinforced plastic, or steel-lined rubber, or steel-lined glass flakes, or steel-lined glass fiber reinforced plastic, or steel-lined plastic, and the like.
More preferably, the continuous reactor is a plurality of reaction zones connected in series separated by intermediate walls.
Preferably, any one or more of the following features are also included:
1) the continuous reactor for treating the wet desulphurization wastewater is provided with three or more reaction zones, and the reaction zones are arranged in series;
2) the continuous reactor realizes the organic combination of a plurality of reaction zones;
3) intermediate partition walls are arranged between the reaction zones, water distribution ports are arranged on the partition walls in a staggered mode, and wastewater flows up and down in the reaction zones;
4) an aeration device is arranged in each air catalytic oxidation reaction zone, and a filler is arranged in the upper space of each air catalytic oxidation reaction zone;
5) a medicament adding device is arranged in the oxidant catalytic reaction zone to realize full contact between the oxidant and the wastewater;
preferably, the air catalytic oxidation primary reaction zone comprises an aeration device, and the aeration device is a jet aerator, or a submersible aerator, or a dispersed flow aerator, or a microporous aerator.
Preferably, the air catalytic oxidation primary reaction zone comprises a filler, preferably an activated carbon honeycomb filler, and the filler is a suspended filler or a suspended filler.
Preferably, the oxidant catalytic reaction zone comprises a reagent feeding device, and a perforated pipe is adopted for feeding the oxidant to realize uniform distribution.
Preferably, the oxidant is hydrogen peroxide, ozone or sodium hypochlorite.
Preferably, the air catalytic oxidation secondary reaction zone and the primary reaction zone are the same in equipment configuration type, and the number of equipment is optimized according to the treatment requirements of each zone.
Preferably, the continuous reactor is provided with a process instrument interface, a pH analyzer is installed, and the pH value of the wastewater is detected.
Preferably, the continuous reactor is controlled in a centralized manner by a system to realize automatic operation.
Compared with the prior art, the utility model, have following advantage and effect:
1. the continuous reactor integrates air oxidation and catalytic oxidation, has the function of adjusting the pH value, and is used for treating the wet desulphurization wastewater.
2. The continuous reactor is an integrated device, has high integration degree and is suitable for various production scales.
3. The continuous reactor adopts segmented series reaction, controls the reaction conditions of all levels, improves the oxidation rate and strengthens the oxidation effect of all levels.
4. The continuous reactor organically combines air oxidation and catalytic oxidation, saves energy consumption and medicine consumption, and reduces the operation cost.
5. The control equipment of the continuous reactor meets the requirements of local control and remote monitoring, realizes automatic operation of the system and is simple to operate.
6. The continuous reactor is mainly used for solving COD in wet desulphurization wastewaterCrThe overproof problem provides water quality guarantee for the direct discharge or indirect discharge of the waste water.
Drawings
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments:
FIG. 1 is a schematic diagram of a continuous reactor process configuration;
in the figure I, a primary reaction zone of air catalytic oxidation is shown; II, an oxidant catalytic reaction zone; III, air catalytic oxidation secondary reaction zone; 1, water inflow; 2, discharging water; 3, a jet flow circulating pump; 4, an aeration device; 5, filling; 6, oxidizing agent; 7, a medicament adding device; 8 blower.
Detailed Description
Taking the treatment of flue gas washing tower wastewater of domestic industrial waste recycling treatment center as an example, the following description is made with reference to the accompanying drawings and the implementation mode:
referring to fig. 1, flue gas of the incineration line is subjected to a flue gas purification process by adopting a quench tower, dry deacidification, cloth bag dust removal and two-stage wet method, wherein the wet desulfurization process is used for purifying HCl and SO in the flue gas2And (4) washing heavy metals in the flue gas by using the gas. The flue gas washing tower wastewater thus produced has high salt (sodium chloride, sodium sulfite), volatile heavy metal (mercury, arsenic) content, and high CODCrThe nature of (c).
The wet desulfurization wastewater has high water temperature, is slightly alkaline, has high Total Dissolved Solids (TDS) content, and causes apparent COD due to high sodium sulfite contentCrThe value is 108-3421 mg/L, and the average value is 1611 mg/L. The continuous reactor is adopted to treat the waste water, the indirect discharge requirement of the standard of sewage discharge into town sewer water quality (DB31/445-2009) is met, and the COD of the effluent water isCrLess than 500 mg/L.
1. Design water quality and quantity
The design water quantity of the device is 325m3/d (13.5m3/h), the design water quality is water temperature of 60 ℃, the pH value is 7-10, CODCr is 2000mg/L, TDS is 33000mg/L, and the salt content is 3% on average.
2. Design flow
The flue gas desulfurization waste water firstly enters an air catalytic oxidation primary reaction zone (I), and is oxygenated by a jet aeration system, wherein the jet aeration system comprises a jet aerator and a jet circulating pump, and is supplemented with activated carbon fiber filler, so that the reaction efficiency is improved, and sulfite in the waste water is oxidized. After the first-stage reaction, the reaction product enters an oxidant catalytic reaction zone (II), and the oxidation reaction of the sulfite is enhanced by adding the oxidant, so that the influence of other ions in water on the reaction effect is prevented. Finally, the effluent passes through an air catalytic oxidation secondary reaction zone (III), and is completely oxidized by utilizing air oxygenation, so that the effluent quality is ensured. As the oxidation reaction proceeds, the pH value of the water will decrease, and alkali liquor is added in the last stage to adjust the pH value. And a tail gas collecting interface is arranged at the top of the continuous reactor, and waste gas is collected and treated in a centralized manner.
The control equipment of the continuous reactor meets the requirements of local control and remote monitoring, the flow meters are arranged on the water inlet pipeline and the gas inlet pipeline, and the requirement of automatic adjustment of the system is realized according to signals output by the flow meters. And a pH measuring instrument is arranged, and the dosage of acid and alkali is adjusted according to the pH value.
3. Design parameters
A. Air catalytic oxidation first-order reaction zone (I)
Hydraulic retention time: 2h
Oxygen demand under standard conditions: 660kgO2/d
Average aeration amount: 1090m3/h (60 ℃, oxygenation efficiency 20%)
Equipment configuration:
1) an ultrasonic liquid level meter: 1 table
2) A jet aerator: 2, 9 nozzles made of PP engineering plastics
3) Jet circulation pump: 3 stands, 2 stands for 1
4) Catalytic packing: active carbon honeycomb filler
5) Aeration blower: 1, air suspension centrifugal blower, simultaneously supplying air to the air catalytic oxidation secondary reaction zone (III)
B. Oxidant catalytic reaction zone (II)
Hydraulic retention time: 1h
Adding amount of an oxidant: 1.5 percent
Equipment configuration:
1) an oxidant storage tank: 1 set of the material is PE and comprises a discharging pump with the storage time of 2d
2) Dosing a dosing pump: 2 stands by, 1 stands by 1
3) Perforating the tube: 1 set of
C. Air catalytic oxidation secondary reaction zone (III)
Hydraulic retention time: 1h
Oxygen demand under standard conditions: 330kgO2/d
Average aeration amount: 545m3/h (60 ℃, oxygenation efficiency 20%)
Equipment configuration:
1) an ultrasonic liquid level meter: 1 table
2) A pH analyzer: 1 table
3) A jet aerator: 1, 9 nozzles made of PP engineering plastics
4) Jet circulation pump: 2 stands by, 1 stands by 1
5) Catalytic packing: active carbon honeycomb filler
4. Effect of treatment
When the continuous reactor is used for treating the wet desulphurization wastewater, the CODCr of the effluent is less than 500mg/L, and the indirect discharge requirement of the Standard for wastewater discharge to urban sewers (DB31/445-2009) is met.
Claims (8)
1. The utility model provides a handle continuous type reactor of wet flue gas desulfurization waste water, its characterized in that, continuous type reactor is integrated processing apparatus, including air catalytic oxidation first order reaction zone (I), oxidant catalytic reaction zone (II), air catalytic oxidation second order reaction zone (III), waste water inlet (1), delivery port (2) of establishing in succession, waste water inlet (1) sets up in air catalytic oxidation first order reaction zone (I), and delivery port (2) set up in air catalytic oxidation second order reaction zone (III) terminal.
2. A continuous reactor according to claim 1, wherein the reactor comprises three or more reaction zones in series.
3. A continuous reactor as claimed in claim 2, wherein intermediate partitions are provided between each reaction zone, and water distribution ports are alternately arranged on the partitions.
4. A continuous reactor as claimed in claim 1, wherein the reactor is made of glass reinforced plastic, steel-lined rubber, steel-lined glass flakes, steel-lined glass reinforced plastic, or steel-lined plastic.
5. A continuous reactor according to claim 1, wherein aeration means (4) are provided in said primary (i) and secondary (iii) reaction zones, and packing (5) is provided in the upper space.
6. A continuous reactor as claimed in claim 5 wherein the aeration means is a jet aerator, or a submersible aerator, or a flood aerator, or a micro-porous aerator.
7. A continuous reactor according to claim 5, characterized in that the packing (5) is in a suspended arrangement or in a suspended arrangement, including but not limited to activated carbon honeycomb packing.
8. The continuous reactor according to claim 1, wherein a reagent adding device (7) is arranged in the oxidant catalytic reaction zone (II), an oxidant (6) is arranged in the reagent adding device (7), and the oxidant (6) is hydrogen peroxide, ozone or sodium hypochlorite.
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| CN201920139732.7U CN210133954U (en) | 2019-01-28 | 2019-01-28 | Continuous reactor for treating wet desulphurization wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533319A (en) * | 2020-05-20 | 2020-08-14 | 北方工业大学 | Device and method for treating COD (chemical oxygen demand) in desulfurization wastewater by ozone oxidation method |
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2019
- 2019-01-28 CN CN201920139732.7U patent/CN210133954U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533319A (en) * | 2020-05-20 | 2020-08-14 | 北方工业大学 | Device and method for treating COD (chemical oxygen demand) in desulfurization wastewater by ozone oxidation method |
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