CN103170232A - Integration device for wet-process oxidation denitration - Google Patents
Integration device for wet-process oxidation denitration Download PDFInfo
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- CN103170232A CN103170232A CN2013101265344A CN201310126534A CN103170232A CN 103170232 A CN103170232 A CN 103170232A CN 2013101265344 A CN2013101265344 A CN 2013101265344A CN 201310126534 A CN201310126534 A CN 201310126534A CN 103170232 A CN103170232 A CN 103170232A
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Abstract
The invention provides a smoke-gas oxidation denitration integration device. The smoke-gas oxidation denitration integration device comprises a reaction tower, wherein a smoke gas inlet and a smoke gas outlet are formed in the tower and the tower is divided into an absorption section and an oxidation section from top to bottom. The integration device for the wet-process oxidation denitration is characterized in that the smoke-gas inlet is formed on the lower part of the oxidation section and connected with a booster fan by a smoke gas pipeline; a denitration sprayer is arranged on the upper part of the oxidation section; a liquid outlet is formed on the bottom of the oxidation section; the liquid outlet is connected with the inlet of an oxidant circulating pump by a pipeline outside the tower; the outlet of the oxidant circulating pump is connected with the denitration sprayer by a pipeline; meanwhile, an oxidant reaction kettle is connected between the liquid outlet and the sprayer; an oxidant adding pump is arranged on the connecting pipeline of the reaction kettle; the smoke gas outlet is formed on the top of the absorption section; an absorbent sprayer is arranged on the upper part of the absorption section; the liquid outlet is formed on the lower part of the absorption section; the liquid outlet is connected with the inlet of the absorbent circulating pump by the pipeline outside the tower; the outlet of the absorbent circulating pump is connected with the absorbent sprayer; meanwhile, an absorbent storage device is connected between the liquid outlet and the sprayer; and the absorbent adding pump is arranged on the connecting pipeline of the storage device.
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 are to control coal combustion product SO
2With one of important method of NOx, based on the present situation of present China Wet Flue Gas Desulfurization Technology extensive use, the wet method that exploitation combines with wet desulphurization is worked in coordination with denitration technology and is had wide prospects for commercial application.Because 95% NOx in flue gas exists with the very low NO form of solubility, at first NO is oxidized to the NO of easy absorption so cross the Cheng Qian in wet absorption
2, the simultaneous oxidation agent is cheap and easy to get, and oxidation product can be recycled, and these are all the wet method keys of desulphurization and denitration technology simultaneously.
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 catalyst is expensive, consumption is large, and device operating cost is high; SNC method technology and equipment system is simpler, and device operating cost is not high, but denitration efficiency can not guarantee.The SNCR-SCR rule combines the characteristics of both techniques, effectively reduces the consumption of catalyst, but its general structure is complicated.
Therefore, high, the equipment for denitrifying flue gas that reaction condition is gentle, energy consumption is low and system architecture is simple and direct of a kind of denitration efficiency of exploitation is that can wet denitration implement industrialized key.
As CN200820216783.7, name is called the patent of invention of " flue gas desulfurization and denitrification purifier ", a kind of flue gas desulfurization and denitrification purifier is disclosed, be provided with king-tower and denitration secondary tower, king-tower is provided with gas approach and clean cigarette outlet, comprises from top to bottom washing demist section, absorber portion and oxidation panel in tower; Described absorber portion is provided with the desulfurization spray thrower, and oxidation panel bottom extraction mouth communicates with the desulfurization spray thrower of absorber portion by the tower external circulation line; The desulphurization circulating pond of oxidation panel bottom is provided with the distributor that communicates with ammonia and air-in, secondary tower is provided with the raw material gas approach, the bottom is the denitration circulatory pool, the top of raw material gas approach is provided with the denitration spray thrower, and communicate with the gas approach of king-tower by the denitration exhanst gas outlet of tower top, described denitration spray thrower by the outer pipeline of tower with extracting out mouthful with the denitration circulatory pool and the desulphurization circulating pond of king-tower oxidation panel bottom is extracted mouth out and is connected.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 resolve into SO
2And ammonia, posing a big pressure to the absorption tower, device is difficult to realize industrialization.
Summary of the invention
The present invention is directed to above-mentioned technical problem, a kind of flue gas oxidation and denitration integrating device is provided, adopt oxidation-absorption two-part integrating device, adopt the product of cheap limewash and chlorine as oxidant, NO is oxidized to NO
2, have a process equipment simple, the advantage 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, be provided with gas approach and exhanst gas outlet 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 the flue outer by tower is connected with booster fan, the top of described oxidation panel is provided with the 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 the tower Outer Tube, the Recycling of oxidize delivery side of pump is connected with the denitration spray thrower by pipeline, simultaneously, be connected with the oxidant reaction still 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 the 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 the tower Outer Tube, absorbent circulation delivery side of pump is connected with the absorbent spray thrower by pipeline, simultaneously, be connected with the absorbent memory between liquid outlet and spray thrower, 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.
Be provided with outer discharge pipe on the connecting pipe of the liquid outlet of described oxidation panel and Recycling of oxidize pump, be provided with valve on outer discharge pipe, be convenient to control and efflux liquid measure.The described liquid measure that effluxes is 5 ~ 10% of total amount of liquid, and the amount that adds with oxidant interpolation pump is identical, avoids the accumulation of oxidation product, keeps the balance of material in oxidation panel.
Be provided with outer discharge pipe on the connecting pipe of described absorbent circulating pump and absorbent spray thrower, be provided with valve on outer discharge pipe, be convenient to control and efflux liquid measure.The described liquid measure that effluxes is 5 ~ 10% of total amount of liquid, and the amount that adds with absorbent interpolation pump is identical, avoids the accumulation of product, keeps the balance of material in absorber portion.
The opening diameter of described absorbent spray thrower is 1 μ m ~ 1mm.
Described whole device can be realized automation control, realizes unattended.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
The intermediate layer of described absorber portion and oxidation panel is the demarcation strip of cavernous structure, has a lot of apertures on demarcation strip, and the anti-overflow weir with cap is housed on aperture, and aperture is distributed as equilateral triangle and distributes, and the perforate gross area is not less than the cross-sectional area of flue.The advantage in cloth hole is that gas distribution is even like this, and percent opening is high, can also effectively keep the rigidity of demarcation strip, and is not yielding.
Reaction raw materials in described oxidant reaction still is limewash and chlorine, and through dilution, the aqueous solution that is mixed with chloranion concentration and is 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 of liquid outlet being discharged by circulating pump is pressed into spray thrower, realized the recycling of waste liquid, whole apparatus structure is simple, can realize simultaneously two steps of denitration and absorption of flue gas, the flue gas of absorber portion top exhanst gas outlet reaches discharging standards, can directly discharge, and has advantages of that the energy consumption of saving and operating cost are low.
2, the present invention is provided with outer discharge pipe on the connecting pipe of the liquid outlet of oxidation panel and Recycling of oxidize pump, be provided with valve on outer discharge pipe, can realize first discharging 5 ~ 10% oxidized residual liquid, add by oxidant the oxidant that pump is added same amount again in the oxidized residual liquid of remainder, get back to oxidation panel recycling, effectively prevented the continuous accumulation of oxidation product in oxidant, keep material balance, realize the recycling of oxidation waste liquid, reached the purpose of saving cost.
3, the present invention is provided with outer discharge pipe on the connecting pipe of absorbent circulating pump and absorbent spray thrower, be provided with valve on outer discharge pipe, can realize first discharging 5 ~ 10% absorbent raffinate, add by absorbent the absorbent that pump is added same amount again in the absorbent raffinate of remainder, get back to absorber portion recycling, effectively prevented product constantly accumulation in absorbent, keep material balance, realized absorbing the recycling of waste liquid, reached the purpose of saving cost.
4, the opening diameter of the present invention's absorbent spray thrower is set to 1 μ m ~ 1mm, the liquid particles diameter of effectively having controlled absorbent is 1 μ m ~ 1mm, because the too large assimilation effect of particle is bad, too little easy entrainment, and bring pressure to foam removal, the present invention selects this particle diameter, can reach good assimilation effect, simultaneously, easy to operate, be easy to industrializing implementation.
5, after the present invention is connected to desulfurizer with the integrating device of wet oxidation denitration, in order to reduce the consumption of oxidant, further saved cost.
6, the present invention has a lot of apertures on the demarcation strip of oxidation panel and absorber portion, and the anti-overflow weir with cap is housed on aperture, and aperture is distributed as equilateral triangle and distributes, and the perforate gross area is not less than the cross-sectional area of flue.The advantage in cloth hole is that gas distribution is even like this, and percent opening is high, guarantees the NO in flue gas
2Be absorbed agent and fully absorb, can also effectively keep the rigidity of demarcation strip, not yielding.
7, the present invention adopt cheap limewash and chlorine product as oxidant, NO is oxidized to NO
2, having a technological process simple, the advantage such as operating cost is cheap is for wet flue gas denitration is explored a practicable industrialization road.
8, the present invention when obtain solution, is controlled at 50 ~ 500g/L with chloranion concentration, and the advantage of doing like this is: on the one hand, the flow of interpolation can be less, saved electric energy; On the other hand, because the flow that adds is little, the raffinate amount of discharging after oxidant and NO reaction is just little, the post processing expense of further having saved 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 reduce the consumption of limewash, has further saved cost.
Description of drawings
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, the denitration spray thrower, 7, liquid outlet, 8, the Recycling of oxidize pump, 9, the oxidant reaction still, 10, oxidant adds pump, and 11, liquid outlet, 12, the absorbent spray thrower, 13, absorbent circulating pump, 14, the absorbent memory, 15, absorbent adds pump, 16, outer discharge pipe, 17, outer discharge pipe, 18, demarcation strip.
The specific embodiment
Below in conjunction with the specific embodiment, 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, be provided with gas approach and exhanst gas outlet 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 the flue outer by tower is connected with booster fan, the top of described oxidation panel is provided with the 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 the tower Outer Tube, the Recycling of oxidize delivery side of pump is connected with the denitration spray thrower by pipeline, simultaneously, be connected with the oxidant reaction still 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 the 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 the tower Outer Tube, absorbent circulation delivery side of pump is connected with the absorbent spray thrower by pipeline, simultaneously, be connected with the absorbent memory between liquid outlet and spray thrower, and with the connecting pipe of memory on absorbent be installed add pump.
The present embodiment is substantially the same manner as Example 1, on this basis:
Be provided with outer discharge pipe on the connecting pipe of the liquid outlet of described oxidation panel and Recycling of oxidize pump, be provided with valve on outer discharge pipe, be convenient to control and efflux liquid measure.
The present embodiment is substantially the same manner as Example 1, on this basis:
Be provided with outer discharge pipe on the connecting pipe of the liquid outlet of described oxidation panel and Recycling of oxidize pump, be provided with valve on outer discharge pipe, be convenient to control and efflux liquid measure.
Be provided with outer discharge pipe on the connecting pipe of described absorbent circulating pump and absorbent spray thrower, be provided with valve on outer discharge pipe, be convenient to control and efflux liquid measure.
The present embodiment is substantially the same manner as Example 3, on this basis:
The liquid measure that effluxes of described oxidation panel is 5% of total amount of liquid, and the amount of adding with oxidant interpolation pump is identical.
The present embodiment is substantially the same manner as Example 3, on this basis:
The liquid measure that effluxes of described oxidation panel is 10% of total amount of liquid, and the amount of adding with oxidant interpolation pump is identical.
The liquid measure that effluxes of described absorber portion is 10% of total amount of liquid, and the amount of adding with absorbent interpolation pump is identical.
The present embodiment is substantially the same manner as Example 3, on this basis:
The liquid measure that effluxes of described oxidation panel is 10% of total amount of liquid, and the amount of adding with oxidant interpolation pump is identical.
The liquid measure that effluxes of described absorber portion is 10% of total amount of liquid, and the amount of adding with absorbent interpolation pump is identical.
The opening diameter of described absorbent spray thrower is 1 μ m.
Embodiment 7
The present embodiment is substantially the same manner as Example 3, on this basis:
The liquid measure that effluxes of described oxidation panel is 6% of total amount of liquid, and the amount of adding with oxidant interpolation pump is identical.
The liquid measure that effluxes of described absorber portion is 6% of total amount of liquid, and the amount of adding with absorbent interpolation pump is identical.
The opening diameter of described absorbent spray thrower is 1mm.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
The present embodiment is substantially the same manner as Example 3, on this basis:
The liquid measure that effluxes of described oxidation panel is 8% of total amount of liquid, and the amount of adding with oxidant interpolation pump is identical.
The liquid measure that effluxes of described absorber portion is 6% of total amount of liquid, and the amount of adding with absorbent interpolation pump is identical.
The opening diameter of described absorbent spray thrower is 100 μ m.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
The intermediate layer of described absorber portion and oxidation panel is the demarcation strip of cavernous structure, has a lot of apertures on demarcation strip, and the anti-overflow weir with cap is housed on aperture, and aperture is distributed as equilateral triangle and distributes, and the perforate gross area is not less than the cross-sectional area of flue.
The present embodiment is substantially the same manner as Example 3, on this basis:
The liquid measure that effluxes of described oxidation panel is 7% of total amount of liquid, and the amount of adding with oxidant interpolation pump is identical.
The liquid measure that effluxes of described absorber portion is 8% of total amount of liquid, and the amount of adding with absorbent interpolation pump is identical.
The opening diameter of described absorbent spray thrower is 50 μ m.
After the integrating device of described wet oxidation denitration is connected to desulfurizer.
The intermediate layer of described absorber portion and oxidation panel is the demarcation strip of cavernous structure, has a lot of apertures on demarcation strip, and the anti-overflow weir with cap is housed on aperture, and aperture is distributed as equilateral triangle and distributes, 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.
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%.
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%.
Described discharging nitrogen oxides in effluent and sulfur dioxide at the content of adsorption tower smoke outlet less than 100mg/m
3, direct qualified discharge.
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%.
Described discharging nitrogen oxides in effluent and sulfur dioxide at the content of adsorption tower smoke outlet less than 100mg/m
3, direct qualified discharge.
Whole plant automation is controlled, and realizes unattended.
Claims (10)
1. the integrating device of a wet oxidation denitration, comprise a reaction tower, be provided with gas approach and exhanst gas outlet 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 the flue outer by tower is connected with booster fan, the top of described oxidation panel is provided with the 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 the tower Outer Tube, the Recycling of oxidize delivery side of pump is connected with the denitration spray thrower by pipeline, simultaneously, be connected with the oxidant reaction still 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 the 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 the tower Outer Tube, absorbent circulation delivery side of pump is connected with the absorbent spray thrower by pipeline, simultaneously, be connected with the absorbent memory between liquid outlet and spray thrower, and with the connecting pipe of memory on absorbent be installed add pump.
2. the integrating device of wet oxidation denitration according to claim 1, is characterized in that: be provided with outer discharge pipe on the connecting pipe of the liquid outlet of described oxidation panel and Recycling of oxidize pump, be provided with valve on outer discharge pipe.
3. the integrating device of wet oxidation denitration according to claim 2, it is characterized in that: the described liquid measure that effluxes is 5 ~ 10% of total amount of liquid, to add the amount that pump adds identical with oxidant.
4. the integrating device of wet oxidation denitration according to claim 1, is characterized in that: be provided with outer discharge pipe on the connecting pipe of described absorbent circulating pump and absorbent spray thrower, be provided with valve on outer discharge pipe.
5. the integrating device of wet oxidation denitration according to claim 4, it is characterized in that: the described liquid measure that effluxes is 5 ~ 10% of total amount of liquid, to add the amount that pump adds identical with absorbent.
6. the integrating device of wet oxidation denitration according to claim 1, it is characterized in that: the opening diameter of described absorbent spray thrower is 1 μ m ~ 1mm.
7. the integrating device of wet oxidation denitration according to claim 1, is characterized in that: after the integrating device of described wet oxidation denitration is connected to desulfurizer.
8. the integrating device of wet oxidation denitration according to claim 1, it is characterized in that: the intermediate layer of described absorber portion and oxidation panel is the demarcation strip of cavernous structure, have aperture on demarcation strip, anti-overflow weir with cap is housed on aperture, aperture is distributed as equilateral triangle and distributes, and the perforate gross area is not less than the cross-sectional area of flue.
9. the integrating device of wet oxidation denitration according to claim 1, it is characterized in that: the 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.
10. the integrating device of wet oxidation denitration according to claim 1, it is characterized in that: described absorbent is limewash, mass concentration is 0.01% ~ 1.0%.
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| CN201310126534.4A CN103170232B (en) | 2013-04-12 | 2013-04-12 | A kind of integrating device of wet oxidation denitration |
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| CN201310126534.4A CN103170232B (en) | 2013-04-12 | 2013-04-12 | A kind of integrating device of wet oxidation denitration |
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| CN106994294A (en) * | 2017-05-15 | 2017-08-01 | 武汉凯比思电力设备有限公司 | A kind of boiler flue gas denitration system and technique |
| 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 |
| CN108314149A (en) * | 2018-03-01 | 2018-07-24 | 南京工程学院 | Desulfurization wastewater is electrolysed and its method of product denitrification integral |
| 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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| 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 |
| CN108314149A (en) * | 2018-03-01 | 2018-07-24 | 南京工程学院 | Desulfurization wastewater is electrolysed and its method of product denitrification integral |
| 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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|---|---|
| CN103170232B (en) | 2016-04-06 |
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