CN103170232B - A kind of integrating device of wet oxidation denitration - Google Patents
A kind of integrating device of wet oxidation denitration Download PDFInfo
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- CN103170232B CN103170232B CN201310126534.4A CN201310126534A CN103170232B CN 103170232 B CN103170232 B CN 103170232B CN 201310126534 A CN201310126534 A CN 201310126534A CN 103170232 B CN103170232 B CN 103170232B
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Abstract
The invention provides a kind of flue gas oxidation and denitration integrating device, comprise a reaction tower, gas approach and exhanst gas outlet is provided with in tower, be divided into absorber portion and oxidation panel from top to bottom, it is characterized in that: described gas approach is arranged on the bottom of oxidation panel, and be connected with booster fan by the flue outside tower, the top of described oxidation panel is provided with denitration spray thrower, the bottom of described oxidation panel is provided with liquid outlet, liquid outlet is connected with the import of Recycling of oxidize pump by tower Outer Tube, Recycling of oxidize delivery side of pump is connected with denitration spray thrower by pipeline, simultaneously, oxidant reaction still is connected with between liquid outlet and spray thrower, and with the connecting pipe of reactor on oxidant be installed add pump, described exhanst gas outlet is arranged on the top of absorber portion, the top of described absorber portion is provided with absorbent spray thrower, the bottom of described absorber portion is provided with liquid outlet, liquid outlet is connected with the import of absorbent circulating pump by tower Outer Tube, absorbent circulation delivery side of pump is connected with absorbent spray thrower by pipeline, meanwhile, between liquid outlet and spray thrower, be connected with absorbent memory, and with the connecting pipe of memory on absorbent be installed add pump.
Description
Technical field
The present invention relates to a kind of environmental protection equipment, be specifically related to a kind of integrating device of wet flue gas oxidation and denitration.
Background technology
Flue gas desulfurization, denitration control coal combustion product SO
2with one of important method of NOx, based on the present situation of current China Wet Flue Gas Desulfurization Technology extensive use, develop the wet method combined with wet desulphurization and work in coordination with denitration technology there is wide prospects for commercial application.Due in flue gas 95% NOx exist with the very low NO form of solubility, so cross Cheng Qian in wet absorption first NO is oxidized to the NO easily absorbed
2, simultaneous oxidation agent is cheap and easy to get, and oxidation product can be recycled, the key of desulphurization and denitration technology while that these being all wet methods.
In existing method of denitration, mainly contain selective catalytic reduction (SCR), SNCR method (SNCR) and SCR and SCR combination method (SNCR-SCR).Wherein SCR method denitration efficiency is high, but its technology and equipment system is more complicated, and expensive catalyst, consumption are large, and plant running cost is high; SNC method technology and equipment system is comparatively simple, and plant running cost is not high, but denitration efficiency can not ensure.SNCR-SCR rule combines the feature of both techniques, effectively reduces the consumption of catalyst, but its general structure is complicated.
Therefore, develop that a kind of denitration efficiency is high, reaction condition is gentle, energy consumption is low and can the equipment for denitrifying flue gas that system architecture is simple and direct be wet denitration implement industrialized key.
As CN200820216783.7, name is called the patent of invention of " flue gas desulfurization and denitrification purifier ", disclose a kind of flue gas desulfurization and denitrification purifier, be provided with king-tower and denitration secondary tower, king-tower is provided with gas approach and the outlet of clean cigarette, comprises washing demist section, absorber portion and oxidation panel in tower from top to bottom; Described absorber portion is provided with desulfurization spray thrower, and outlet port, oxidation panel bottom is communicated with the desulfurization spray thrower of absorber portion by tower external circulation line; Desulphurization circulating pond bottom oxidation panel is provided with the distributor communicated with ammonia and air-in, secondary tower is provided with raw material gas approach, bottom is denitration circulatory pool, the top of raw material gas approach is provided with denitration spray thrower, and communicated with the gas approach of king-tower by the denitration exhanst gas outlet of tower top, described denitration spray thrower is connected with the outlet port, desulphurization circulating pond bottom king-tower oxidation panel with denitration circulatory pool outlet port by the outer pipeline of tower is same.This device utilizes the intermediate material ammonium bisulfite of ammonia sweetening process and ammonium sulfite to carry out denitration.There is following shortcoming in this device: due to the unstability of ammonium bisulfite and ammonium sulfite, easily resolves into SO
2and ammonia, pose a big pressure to absorption tower, device is difficult to realize industrialization.
Summary of the invention
The present invention is directed to above-mentioned technical problem, provide a kind of flue gas oxidation and denitration integrating device, adopt oxidation-absorption two-part integrating device, adopt the product of cheap limewash and chlorine as oxidant, NO is oxidized to NO
2, there is process equipment simple, the advantages such as operating cost is cheap.
For achieving the above object, the present invention adopts following technical scheme:
A kind of integrating device of wet oxidation denitration, comprise a reaction tower, gas approach and exhanst gas outlet is provided with in tower, be divided into absorber portion and oxidation panel from top to bottom, it is characterized in that: described gas approach is arranged on the bottom of oxidation panel, and be connected with booster fan by the flue outside tower, the top of described oxidation panel is provided with denitration spray thrower, the bottom of described oxidation panel is provided with liquid outlet, liquid outlet is connected with the import of Recycling of oxidize pump by tower Outer Tube, Recycling of oxidize delivery side of pump is connected with denitration spray thrower by pipeline, simultaneously, oxidant reaction still is connected with between liquid outlet and spray thrower, and with the connecting pipe of reactor on oxidant be installed add pump,
Described exhanst gas outlet is arranged on the top of absorber portion, the top of described absorber portion is provided with absorbent spray thrower, the bottom of described absorber portion is provided with liquid outlet, liquid outlet is connected with the import of absorbent circulating pump by tower Outer Tube, absorbent circulation delivery side of pump is connected with absorbent spray thrower by pipeline, meanwhile, between liquid outlet and spray thrower, be connected with absorbent memory, and with the connecting pipe of memory on absorbent be installed add pump.
The flue gas of absorber portion top exhanst gas outlet reaches discharging standards, can directly discharge.
The liquid outlet of described oxidation panel and the connecting pipe of Recycling of oxidize pump are provided with outer discharge pipe, outer discharge pipe is provided with valve, be convenient to control exterior liquid amount.Described exterior liquid amount is 5 ~ 10% of total amount of liquid, and to add the amount that pump adds identical with oxidant, avoids the accumulation of oxidation product, maintain the balance of material in oxidation panel.
The connecting pipe of described absorbent circulating pump and absorbent spray thrower is provided with outer discharge pipe, outer discharge pipe is provided with valve, be convenient to control exterior liquid amount.Described exterior liquid amount is 5 ~ 10% of total amount of liquid, and to add the amount that pump adds identical with absorbent, avoids the accumulation of product, maintain the balance of material in absorber portion.
The opening diameter of described absorbent spray thrower is 1 μm ~ 1mm.
Described whole device can realize Automated condtrol, realizes unattended.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
Described absorber portion and the intermediate layer of oxidation panel are the demarcation strips of cavernous structure, demarcation strip have a lot of aperture, aperture are equipped with the anti-overflow weir of band cap, and aperture is distributed as equilateral triangle distribution, and the perforate gross area is not less than the cross-sectional area of flue.The advantage in such cloth hole is uniform air distribution, and percent opening is high, effectively can also keep the rigidity of demarcation strip, not yielding.
Reaction raw materials in described oxidant reaction still is limewash and chlorine, and through dilution, being mixed with chloranion concentration is that the aqueous solution of 5 ~ 50g/L enters oxidation panel as oxidant.
Described absorbent is limewash, and mass concentration is 0.01% ~ 1.0%.
Beneficial effect of the present invention is:
1, the present invention adopts oxidation-absorption two-part integrating device, the waste liquid press-in spray thrower of liquid outlet being discharged by circulating pump, achieve recycling of waste liquid, whole apparatus structure is simple, denitration and absorption two steps of flue gas can be realized simultaneously, the flue gas of absorber portion top exhanst gas outlet reaches discharging standards, can directly discharge, and has and saves energy consumption and the low advantage of operating cost.
2, the present invention is provided with outer discharge pipe on the liquid outlet of oxidation panel and the connecting pipe of Recycling of oxidize pump, outer discharge pipe is provided with valve, the oxidized residual liquid of first discharging 5 ~ 10% can be realized, add by oxidant the oxidant that identical amount added by pump again in the oxidized residual liquid of remainder, get back to oxidation panel to recycle, effectively prevent the continuous accumulation of oxidation product in oxidant, keep material balance, achieve recycling of oxidation waste liquid, reach cost-saving object.
3, the present invention is provided with outer discharge pipe in the connecting pipe of absorbent circulating pump and absorbent spray thrower, outer discharge pipe is provided with valve, the absorbent raffinate of first discharging 5 ~ 10% can be realized, add by absorbent the absorbent that identical amount added by pump again in the absorbent raffinate of remainder, get back to absorber portion to recycle, effectively prevent product and constantly accumulate in absorbent, keep material balance, achieve and absorb recycling of waste liquid, reach cost-saving object.
4, the opening diameter of absorbent spray thrower is set to 1 μm ~ 1mm by the present invention, the liquid particles diameter effectively controlling absorbent is 1 μm ~ 1mm, because the too large assimilation effect of particle is bad, too little then easy entrainment, and bring pressure to foam removal, the present invention selects this particle diameter, good assimilation effect can be reached, meanwhile, easy to operate, be easy to industrializing implementation.
5, after the integrating device of wet oxidation denitration is connected to desulfurizer by the present invention, to reduce the consumption of oxidant, cost is further saved.
6, the present invention has a lot of aperture on the demarcation strip of oxidation panel and absorber portion, aperture is equipped with the anti-overflow weir of band cap, and aperture is distributed as equilateral triangle distribution, and the perforate gross area is not less than the cross-sectional area of flue.The advantage in such cloth hole is uniform air distribution, and percent opening is high, ensures the NO in flue gas
2fully absorbed by absorbent, effectively can also keep the rigidity of demarcation strip, not yielding.
7, the present invention adopts the product of cheap limewash and chlorine as oxidant, and NO is oxidized to NO
2, have technological process simple, the advantages such as operating cost is cheap, for wet flue gas denitration explores a practicable industrialization road.
8, the present invention is when obtain solution, controls at 50 ~ 500g/L by chloranion concentration, and the advantage done like this is: on the one hand, and the flow of interpolation can be less, saved electric energy; On the other hand, because the flow added is little, then oxidant and NO react after the raffinate amount of discharging just little, further save the post processing expense of electric energy and waste liquid.
9, the present invention adopts cheap limewash as absorbent, and controls concentration of lye 0.01% ~ 1.0%, is conducive to the consumption reducing limewash, further saves cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of wet oxidation denitration integrated device of the present invention.
Be labeled as in figure: 1, absorber portion, 2, oxidation panel, 3, gas approach, 4, exhanst gas outlet, 5, booster fan, 6, denitration spray thrower, 7, liquid outlet, 8, Recycling of oxidize pump, 9, oxidant reaction still, 10, oxidant adds pump, and 11, liquid outlet, 12, absorbent spray thrower, 13, absorbent circulating pump, 14, absorbent memory, 15, absorbent adds pump, 16, outer discharge pipe, 17, outer discharge pipe, 18, demarcation strip.
Detailed description of the invention
Below in conjunction with detailed description of the invention, essentiality content of the present invention is described in further detail.
Embodiment 1
A kind of integrating device of wet oxidation denitration, comprise a reaction tower, gas approach and exhanst gas outlet is provided with in tower, be divided into absorber portion and oxidation panel from top to bottom, described gas approach is arranged on the bottom of oxidation panel, and be connected with booster fan by the flue outside tower, the top of described oxidation panel is provided with denitration spray thrower, the bottom of described oxidation panel is provided with liquid outlet, liquid outlet is connected with the import of Recycling of oxidize pump by tower Outer Tube, Recycling of oxidize delivery side of pump is connected with denitration spray thrower by pipeline, simultaneously, oxidant reaction still is connected with between liquid outlet and spray thrower, and with the connecting pipe of reactor on oxidant be installed add pump,
Described exhanst gas outlet is arranged on the top of absorber portion, the top of described absorber portion is provided with absorbent spray thrower, the bottom of described absorber portion is provided with liquid outlet, liquid outlet is connected with the import of absorbent circulating pump by tower Outer Tube, absorbent circulation delivery side of pump is connected with absorbent spray thrower by pipeline, meanwhile, between liquid outlet and spray thrower, be connected with absorbent memory, and with the connecting pipe of memory on absorbent be installed add pump.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, on this basis:
The liquid outlet of described oxidation panel and the connecting pipe of Recycling of oxidize pump are provided with outer discharge pipe, outer discharge pipe is provided with valve, be convenient to control exterior liquid amount.
Embodiment 3
The present embodiment is substantially the same manner as Example 1, on this basis:
The liquid outlet of described oxidation panel and the connecting pipe of Recycling of oxidize pump are provided with outer discharge pipe, outer discharge pipe is provided with valve, be convenient to control exterior liquid amount.
The connecting pipe of described absorbent circulating pump and absorbent spray thrower is provided with outer discharge pipe, outer discharge pipe is provided with valve, be convenient to control exterior liquid amount.
Embodiment 4
The present embodiment is substantially the same manner as Example 3, on this basis:
The exterior liquid amount of described oxidation panel is 5% of total amount of liquid, and to add the amount that pump adds identical with oxidant.
Embodiment 5
The present embodiment is substantially the same manner as Example 3, on this basis:
The exterior liquid amount of described oxidation panel is 10% of total amount of liquid, and to add the amount that pump adds identical with oxidant.
The exterior liquid amount of described absorber portion is 10% of total amount of liquid, and to add the amount that pump adds identical with absorbent.
Embodiment 6
The present embodiment is substantially the same manner as Example 3, on this basis:
The exterior liquid amount of described oxidation panel is 10% of total amount of liquid, and to add the amount that pump adds identical with oxidant.
The exterior liquid amount of described absorber portion is 10% of total amount of liquid, and to add the amount that pump adds identical with absorbent.
The opening diameter of described absorbent spray thrower is 1 μm.
Embodiment 7
The present embodiment is substantially the same manner as Example 3, on this basis:
The exterior liquid amount of described oxidation panel is 6% of total amount of liquid, and to add the amount that pump adds identical with oxidant.
The exterior liquid amount of described absorber portion is 6% of total amount of liquid, and to add the amount that pump adds identical with absorbent.
The opening diameter of described absorbent spray thrower is 1mm.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
Embodiment 8
The present embodiment is substantially the same manner as Example 3, on this basis:
The exterior liquid amount of described oxidation panel is 8% of total amount of liquid, and to add the amount that pump adds identical with oxidant.
The exterior liquid amount of described absorber portion is 6% of total amount of liquid, and to add the amount that pump adds identical with absorbent.
The opening diameter of described absorbent spray thrower is 100 μm.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
Described absorber portion and the intermediate layer of oxidation panel are the demarcation strips of cavernous structure, demarcation strip have a lot of aperture, aperture are equipped with the anti-overflow weir of band cap, and aperture is distributed as equilateral triangle distribution, and the perforate gross area is not less than the cross-sectional area of flue.
Embodiment 9
The present embodiment is substantially the same manner as Example 3, on this basis:
The exterior liquid amount of described oxidation panel is 7% of total amount of liquid, and to add the amount that pump adds identical with oxidant.
The exterior liquid amount of described absorber portion is 8% of total amount of liquid, and to add the amount that pump adds identical with absorbent.
The opening diameter of described absorbent spray thrower is 50 μm.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
Described absorber portion and the intermediate layer of oxidation panel are the demarcation strips of cavernous structure, demarcation strip have a lot of aperture, aperture are equipped with the anti-overflow weir of band cap, and aperture is distributed as equilateral triangle distribution, and the perforate gross area is not less than the cross-sectional area of flue.
Embodiment 10
The present embodiment is substantially the same manner as Example 9, on this basis:
Reaction raw materials in described oxidant reaction still is limewash and chlorine, is mixed with the aqueous solution that chloranion concentration is 50g/L.
Embodiment 11
The present embodiment is substantially the same manner as Example 9, on this basis:
Reaction raw materials in described oxidant reaction still is limewash and chlorine, is mixed with the aqueous solution that chloranion concentration is 500g/L.
Described absorbent is limewash, and mass concentration is 0.01%.
Embodiment 12
The present embodiment is substantially the same manner as Example 9, on this basis:
Reaction raw materials in described oxidant reaction still is limewash and chlorine, is mixed with the aqueous solution that chloranion concentration is 200g/L.
Described absorbent is limewash, and mass concentration is 1.0%.
Embodiment 13
The present embodiment is substantially the same manner as Example 9, on this basis:
Reaction raw materials in described oxidant reaction still is limewash and chlorine, is mixed with the aqueous solution that chloranion concentration is 100g/L.
Described absorbent is limewash, and mass concentration is 0.1%.
The content that described discharge nitrogen oxides in effluent and sulfur dioxide export at adsorption tower smoke is less than 100mg/m
3, direct qualified discharge.
Embodiment 14
The present embodiment is substantially the same manner as Example 9, on this basis:
Reaction raw materials in described oxidant reaction still is limewash and chlorine, is mixed with the aqueous solution that chloranion concentration is 150g/L.
Described absorbent is limewash, and mass concentration is 0.5%.
The content that described discharge nitrogen oxides in effluent and sulfur dioxide export at adsorption tower smoke is less than 100mg/m
3, direct qualified discharge.
Whole plant automation controls, and realizes unattended.
Claims (8)
1. a wet oxidation denitrating technique, comprise a reaction tower, gas approach and exhanst gas outlet is provided with in tower, be divided into absorber portion and oxidation panel from top to bottom, it is characterized in that: described gas approach is arranged on the bottom of oxidation panel, and be connected with booster fan by the flue outside tower, the top of described oxidation panel is provided with denitration spray thrower, the bottom of described oxidation panel is provided with liquid outlet, liquid outlet is connected with the import of Recycling of oxidize pump by tower Outer Tube, Recycling of oxidize delivery side of pump is connected with denitration spray thrower by pipeline, simultaneously, oxidant reaction still is connected with between liquid outlet and spray thrower, and with the connecting pipe of reactor on oxidant be installed add pump,
Described exhanst gas outlet is arranged on the top of absorber portion, the top of described absorber portion is provided with absorbent spray thrower, the bottom of described absorber portion is provided with liquid outlet, liquid outlet is connected with the import of absorbent circulating pump by tower Outer Tube, absorbent circulation delivery side of pump is connected with absorbent spray thrower by pipeline, meanwhile, between liquid outlet and spray thrower, be connected with absorbent memory, and with the connecting pipe of memory on absorbent be installed add pump;
Reaction raw materials in described oxidant reaction still is limewash and chlorine, is mixed with the aqueous solution that chloranion concentration is 50 ~ 500g/L;
Described absorbent is limewash, and mass concentration is 0.01% ~ 1.0%.
2. a kind of wet oxidation denitrating technique according to claim 1, is characterized in that: the liquid outlet of described oxidation panel and the connecting pipe of Recycling of oxidize pump are provided with outer discharge pipe, outer discharge pipe is provided with valve.
3. a kind of wet oxidation denitrating technique according to claim 2, is characterized in that: the exterior liquid amount of described outer discharge pipe is 5 ~ 10% of total amount of liquid, and to add the amount that pump adds identical with oxidant.
4. a kind of wet oxidation denitrating technique according to claim 1, is characterized in that: the connecting pipe of described absorbent circulating pump and absorbent spray thrower is provided with outer discharge pipe, outer discharge pipe is provided with valve.
5. a kind of wet oxidation denitrating technique according to claim 4, is characterized in that: the exterior liquid amount of described outer discharge pipe is 5 ~ 10% of total amount of liquid, and to add the amount that pump adds identical with absorbent.
6. a kind of wet oxidation denitrating technique according to claim 1, is characterized in that: the opening diameter of described absorbent spray thrower is 1 μm ~ 1mm.
7. a kind of wet oxidation denitrating technique according to claim 1, is characterized in that: after the device of wet oxidation denitration is connected to desulfurizer.
8. a kind of wet oxidation denitrating technique according to claim 1, it is characterized in that: described absorber portion and the intermediate layer of oxidation panel are the demarcation strips of cavernous structure, demarcation strip has aperture, the anti-overflow weir of band cap aperture is equipped with, aperture is distributed as equilateral triangle distribution, and the perforate gross area is not less than the cross-sectional area of flue.
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| CN106994294B (en) * | 2017-05-15 | 2023-03-17 | 武汉凯比思电力设备有限公司 | Boiler flue gas denitration system and process |
| CN107638787A (en) * | 2017-10-17 | 2018-01-30 | 东方电气集团东方锅炉股份有限公司 | The system and method for nitrogen oxides in a kind of removing gas |
| CN108314149B (en) * | 2018-03-01 | 2021-03-02 | 南京工程学院 | Method for integrating desulfurization wastewater electrolysis and product denitration |
| CN108922645A (en) * | 2018-08-23 | 2018-11-30 | 中国原子能科学研究院 | The adjusting preparation facilities of 2AF feed liquid in nuclear fuel aftertreatment technology process |
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