CN202962241U - Device for synergistically removing flue gas mercury - Google Patents

Device for synergistically removing flue gas mercury Download PDF

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Publication number
CN202962241U
CN202962241U CN 201220647597 CN201220647597U CN202962241U CN 202962241 U CN202962241 U CN 202962241U CN 201220647597 CN201220647597 CN 201220647597 CN 201220647597 U CN201220647597 U CN 201220647597U CN 202962241 U CN202962241 U CN 202962241U
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demercuration
reducing agent
mercury
scr denitrification
flue gas
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杨志忠
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Dongfang Boiler Group Co Ltd
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Dongfang Boiler Group Co Ltd
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Abstract

The utility model discloses a device for synergistically removing flue gas mercury, belonging to the field of purification of flue gas of atmospheric pollutant of power station boilers. The device comprises a selective catalytic reduction (SCR) denitration reducing agent supply device, an SCR denitration reducing agent injection device, an SCR denitration device reactor, a dust remover and a wet flue gas desulfurization device of an SCR denitration system, and also comprises a demercuration oxidant supply device and a mixing device for mixing primary air of boiler heat, secondary air of the boiler heat, the demercuration oxidant and the SCR denitration reducing agent. The device completely utilizing the synergistic function of the conventional SCR denitration system, the dust remover and wet flue gas desulfurization (WFGD), and has the advantages that the system is slightly changed and the demercuration effect is good.

Description

A kind of device of gas mercury cooperation-removal
Technical field
The utility model belongs to boiler of power plant atmosphere pollution filed of flue gas purification, relates in particular to the device of the collaborative demercuration of flue gas of a kind of denitration, deduster, desulfurization.
Background technology
Mercury is the trace element in coal, and burning is rear with gaseous elemental mercury Hg 0(g), gaseous state divalence mercury Hg 2+, and particle mercury Hg(p) three kinds of forms are present in flue gas, divalence mercury Hg in gaseous mercury wherein 2+Account for 30~95 %, Elemental Mercury accounts for 5~70 %.
GB13223-2011 " fossil-fuel power plant atmospheric pollutant emission standard " regulation, from 1 day January in 2015, all electricity generation boilers will be carried out mercury and mercuric compounds less than the concentration of emission limit value of 0.03mg/Nm3.Present most coal-fired flue-gas is supporting SCR (SCR) denitrification apparatus, deduster and the WFGD device installed, these devices all have certain remove to the mercury in flue gas, but for the higher coal of burning mercury content, even adopted these devices, mercury emissions concentration can not satisfy the concentration of emission limit value, need to take corresponding special technology.
Patent documentation: publication number CN 1962034A, the Chinese invention patent application prospectus has proposed a kind of calcium hydroxide, flyash, additive (as potassium permanganate, sodium chlorite, sodium chloride etc.) of adding in circulating fluid bed desulfurization device, silicon in flyash, iron, magnesium, aluminium etc. play catalyst action, additive plays oxidant and reactant effect, the SO in calcium hydroxide and flue gas 2Reaction generates calcium sulfite, and calcium sulfite is oxidized to calcium sulfate, and NO is oxidized to NO 2, NO 2Reaction generates calcium nitrate, the simple substance nonvalent mercury Hg in flue gas with calcium hydroxide 0Changed into divalence mercury Hg by Catalytic Oxygen 2+Desulphurization and denitration, demercuration method in the time of with sodium salt or sulfate reaction generation mercury chloride or calcium sulfate.The whole pollutant removing efficient of the method is lower, wherein sulfur dioxide removal efficient 90%, removal of nitrogen oxide efficient 60%, mercury removal rate 50%, and its emissions concentration can not satisfy the environmental protection restriction of present regulation.
Patent documentation: publication number CN 101157003A, Chinese invention patent application prospectus have introduced and have a kind ofly sprayed into oxidant Cl at the electrostatic precipitator inlet flue duct 2, with the simple substance nonvalent mercury Hg in flue gas 0Be oxidized to the divalence mercury Hg that is easy to remove 2+, divalence mercury Hg 2+Be washed the method that removes in ammonia desulfuration equipment.The method defective: the part mercury removal function that does not have the existing supporting SCR denitrification apparatus of utilization to have, oxidant Cl 2Be a kind of noxious material, transportation need to be taked special measure with storage, and the subsequent treatment difficulty of system is large, and cost of investment and operating cost are high.
Patent documentation: publication number CN 101306322A, Chinese invention patent application prospectus have proposed a kind of method of adding the strong oxidizer sodium chlorite in the JBR tower, the simple substance nonvalent mercury being oxidized to mercuric integrated desulfurization of being easy to remove, denitration, demercuration.The method defective: the strong oxidizer cost is high, and brings new problem of environmental pollution to subsequent treatment.
Patent documentation: publication number CN 101543712A, Chinese invention patent application prospectus have introduced multistage humidification cooperation-removal SO in a kind of recirculating fluidized bed 2, NO x, mercury method, the method system complex, mercury removal efficient wherein is on the low side, the mercury concentration in flue gas can not meet present environmental regulation emission limit.
In addition, because mercury in flue gas concentration is very low, needed oxidant content seldom, oxidant is injected in flue gas and evenly mixes with flue gas the technological difficulties that are difficult to solve in mercury removal especially.
The utility model content
The purpose of this utility model is: take full advantage of the synergistic function of existing SCR denitrating system, deduster and WFGD, proposes the change of a kind of system less, the respond well gas mercury cooperation-removal device of demercuration.
The utility model purpose realizes by following technical proposals:
a kind of device of gas mercury cooperation-removal, the SCR denitrification reducing agent feedway that comprises the SCR denitrating system, SCR denitrification reducing agent injection device, SCR denitrification apparatus reactor, deduster and wet flue gas desulfurizer, also comprise demercuration oxidant feedway, air mixing device, it is respectively equipped with connection boiler heat primary air or hot Secondary Air and described demercuration oxidant feedway described air mixing device, the entrance of SCR denitrification reducing agent feedway, and the outlet that is communicated with described SCR denitrification reducing agent injection device, and go out described, also be provided with air mixer between entrance, be provided with the flue gas blender between described SCR denitrification reducing agent injection device and SCR denitrification apparatus reactor.
As optimal way, the connection boiler heat primary air of described air mixing device or hot Secondary Air entrance are communicated with the air preheater of described SCR denitrification apparatus reactor downstream.
As optimal way, before described wet flue gas desulfurizer downstream, the final discharging of flue gas, also be provided with the mercury on-line detector, described demercuration oxidant feedway is electrically connected to described mercury on-line detector, closed-loop control, and according to the mercury emissions concentration signal of its feedback, control the concentration and/or the amount that spray into the demercuration oxidant in described air mixing device.
As optimal way, described demercuration oxidant feedway is the device that reproduces the SCR denitrification reducing agent, and it is electrically connected to described SCR denitrification reducing agent feedway, closed-loop control; Described SCR denitrification apparatus reactor upstream and downstream flue also is provided with the NOx in-line analyzer, described SCR denitrification reducing agent feedway is electrically connected to described NOx in-line analyzer, closed-loop control, and according to the amount of the demercuration oxidant of the NOx concentration of emission signal of its feedback and described demercuration oxidant feedway feedback, control the concentration and/or the amount that pass into the SCR denitrification reducing agent in described mixing arrangement.
As optimal way, described demercuration oxidant feedway comprises demercuration oxidizing agent solution spray gun, and the demercuration oxidizing agent solution pipeline, the compressed-air line that are equipped with flowmeter and control valve, described demercuration oxidizing agent solution spray gun is comprised of nozzle, inner sleeve, outer tube, inner sleeve interface and outer tube interface, and described inside and outside cover interface tube connects respectively described demercuration oxidizing agent solution pipeline or compressed-air line separately.
As optimal way, described SCR denitrification reducing agent feedway is the reductant line that is provided with flowmeter and control valve.
As further preferred embodiment, described SCR denitrification reducing agent injection device is reducing agent injection grid.
The device technique process:
The inventor finds: particle mercury Hg(p) be easy to efficiently be removed by deduster; Wet flue gas desulfurizer (WFGD) can absorb gaseous state divalence mercury Hg soluble in water 2+, absorption efficiency can reach 70%; SCR (SCR) equipment for denitrifying flue gas can be with Elemental Mercury Hg in reducing NOx 0Be oxidized to the divalence mercury Hg that is easily removed by WFGD 2+, Elemental Mercury Hg 0Efficient by SCR device catalytic oxidation can reach 80~90%.Therefore take full advantage of existing SCR denitrating system, deduster, desulphurization system in the utility model scheme, both realized the synergy of good denitration, desulfurization, demercuration, simultaneously demercuration is respond well satisfies the national standard requirement, and system changes less, the investment for trnasforming urban land cost is low, and system is simple and reliable.
And, because mercury in flue gas concentration is very low, the amount of needed demercuration oxidant seldom, the inventor adopts the method for stepwise dilution and diffusion, solves oxidant and evenly spreads to technological difficulties in flue gas, guarantees good demercuration effect:
draw temperature boiler heat primary air or hot Secondary Air as the thermal source of demercuration oxidant heating/decompose and add thermal decomposition and/or diluent air (optimum is the boiler heat primary air that adopts pressure 5000-12000Pa) as the SCR denitrification reducing agent, mix with demercuration oxidant and SCR denitrification reducing agent, this is mixing for the first time and the dilution of demercuration oxidant, utilizing afterwards SCR denitrification apparatus denitrification reducing agent injection apparatus originally to spurt in flue gas mixes with flue gas again, this is mixing for the second time and the dilution of demercuration oxidant, minute quantity demercuration oxidant and a large amount of well-mixed technological difficulties of flue gas had both been solved thus, realize again simultaneously fully mixing of denitrification reducing agent and flue gas, kill two birds with one stone.
The demercuration oxidant adopts HCl, is ejected in the device of introducing a hot wind or Secondary Air as the demercuration oxidizing agent solution (and other can decompose the oxidant with identical function that produces similar HCl) with the hydrochloric acid solution of the ammonium chloride solution of 0-43%Wt. or 0-37%Wt..
The demercuration oxidizing agent solution is decomposes under wind of the heat of introducing or Secondary Air heating:
Ammonium chloride decomposes ammonification and hydrogen chloride, NH 4Cl → NH 3+ HCl
HCl(l)→HCL(g)
The gaseous state HCl that the demercuration oxidizing agent solution decomposes is with after hot air and SCR denitrification reducing agent are tentatively mixed, the dozens of at least of the denitrification reducing agent injection device by the SCR denitration (preferred ammonia injection grid (AIG)) self spouts of up to a hundred at most is injected in flue gas, mix by the flue gas blender again, make demercuration reducing agent, SCR denitrification reducing agent evenly spread in flue gas.
The oxidation of mercury:
Smoke gas flow is through the SCR device, under SCR denitrification apparatus catalyst action, and gaseous elemental mercury Hg in flue gas 0Be oxidized to the gaseous state divalence mercury oxide Hg that is easy to by the absorption of downstream WFGD device 2+(HgCl 2):
Hg 0+1/2O 2+?2HCl→HgCl 2+H 2O
The cooperation-removal of mercury:
After flue gas process SCR denitrification apparatus, flow to deduster and the WFGD device in downstream, particle mercury Hg(p in flue gas) collected by deduster and remove, gaseous state divalence mercury oxide Hg in flue gas 2+Absorbed by the WFGD device, the clean flue gas that has removed mercury enters atmosphere by chimney.
Control strategy:
On the flue before WFGD downstream, chimney entrance, the mercury on-line detector is set, detects the mercury emissions concentration in flue gas, feed back by concentration signal, concentration and/or the amount of the demercuration oxidant that control sprays into.
The beneficial effects of the utility model: utilize SCR denitrification apparatus, deduster, WFGD device, reach the purpose of cooperation-removal mercury in flue gas, satisfy the smoke mercury emission standard.
Take full advantage of wind of boiler hot or Secondary Air and the SCR denitration AIG structure of heat, send out equably demercuration oxidant stepwise dilution in flue gas, solved dexterously because the demercuration oxidant content is difficult to evenly spread to difficult point in flue gas less, and saved simultaneously demercuration cost of investment and operating cost.
Description of drawings
Fig. 1 is the device schematic flow sheet of the utility model embodiment 1;
Fig. 2 is the structural representation of demercuration oxidant lance in embodiment 1;
Fig. 3 is the device schematic flow sheet of the utility model embodiment 2.
The specific embodiment
Following non-limiting examples is used for explanation the utility model.
Embodiment 1:
As shown in Figure 1, 2, the demercuration oxidant adopts the 0-43%Wt. ammonium chloride solution.
The flue gas 11 that boiler 1 burning the generates SCR denitrification apparatus upstream flue 40 of flowing through, mix with SCR denitrification apparatus AIG injection pipeline 46 spray people's demercuration oxidant HCl gas, after mixing through flue gas blender 47, enter SCR denitrification apparatus reactor 49, under 48 effects of SCR catalyst, the gaseous elemental mercury Hg in flue gas 0Be oxidized to gaseous state divalence mercury oxide Hg 2+(HgCl 2); Enter downstream again deduster 6, particle mercury Hg(p in flue gas after 5 heat exchange of flue gas process air preheater) collected by deduster 6 and remove; The flue gas that removes particle mercury enters wet process of FGD (WFGD) device 8, gaseous state divalence mercury oxide Hg in flue gas through air-introduced machine 7 2+Absorbed by the spray liquid of WFGD device 8, the clean flue gas that has removed mercury enters atmosphere by chimney 9 at last.
The Secondary Air 51 that draws wind of heat of the 0.5-3% flow after air preheater 5 heat exchange or heat is as the thermal source of demercuration oxidant decomposes and the SCR denitrification reducing agent adds thermal decomposition and/or diluent air enters air mixer pipeline 44.SCR denitrification reducing agent feedway: denitrification reducing agent 41 enters air mixer pipeline 44 after regulating denitrification reducing agent flow 43 through denitrification reducing agent flow control valve 42, after mixing through air mixer 45, be expelled in flue 40 by SCR denitrification apparatus AIG 46, mix through flue gas blender 47 again, flow into SCR denitrification apparatus reactor 49, be issued to the purpose of denitration in catalyst 48 effects.
Demercuration oxidant feedway: the 0-43%Wt. ammonium chloride solution 21 in ammonium chloride solution storage tank 2 is carried demercuration oxidizing agent solution spray gun 25 by pump 24, and in air mixer pipeline 44, the ammonium chloride solution decomposes becomes gas NH by spray gun 25 atomized sprays 3With gas HCl, send out in flue 40 by dozens of to hundreds of spouts of SCR denitrification apparatus AIG 16 self after mixing through air mixer 45 with the SCR denitrification reducing agent, then mix by flue gas blender 45, make HCl and NH 3Evenly spread in flue gas, under catalyst action, HCl is as the oxidant of mercury, with the gaseous elemental mercury Hg in flue gas 0Be oxidized to gaseous state divalence mercury oxide Hg 2+(HgCl 2), NH 3Remove NOx in flue gas as the reducing agent of SCR denitration.
Demercuration oxidizing agent solution spray gun 25, accompanying drawing 2 is comprised of nozzle 251, inner sleeve 252, outer tube 253, inner sleeve 254 interfaces and outer tube 255 interfaces.Outer tube interface 255 connects demercuration oxidizing agent solution 21 pipelines, and inner sleeve interface 254 connects compressed air 31 pipelines.Regulate oxidizer flow rate 23 by the control valve 22 of regulating on demercuration oxidizing agent solution 21 pipelines, the control valve 32 of regulating on compressed air 31 pipelines is regulated compressed air require 33, the mass ratio that makes compressed air and oxidizing agent solution is 2-10, the drop atomized spray that oxidizing agent solution is atomized into 1-100 μ m makes the quick decomposes of demercuration oxidizing agent solution in air mixer pipeline 44.The pipeline of spray gun internal and external casing interface connecting media can exchange mutually.
Be provided with NOx in-line analyzer 49-1 and 49-2 at SCR denitrification apparatus reactor 49 upstream and downstream flues,, its signal feedback is regulated denitrification reducing agent flow 43 to denitrification reducing agent flow control valve 42, controls denitration efficiency.
Between WFGD device 8 and chimney 9, mercury detector 99 is set, is discharged into mercury concentration in atmosphere in order to detection.Mercury detector 99 signal feedback are regulated oxidizer flow rate 23 to demercuration oxidizing agent solution flow control valve 22; Demercuration oxidizing agent solution flow control valve 22 aperture signal feedback are regulated denitrification reducing agent flow 43 to SCR denitrification reducing agent flow control valve 42.
Denitrification reducing agent is gas ammonia, ammoniacal liquor and urea liquid.If the employing urea liquid arranges heater at air mixer 45, with the dielectric heating to 400 in mixing arrangement ℃-650 ℃.
Embodiment 2:
As shown in Figure 3: the demercuration oxidant adopts the hydrochloric acid solution of 0-37%Wt..
The present embodiment and embodiment are basic identical, and its difference is: the demercuration oxidant is except ammonium chloride solution, also can adopt can decomposes produce HCl with the similar oxidant of ammonium chloride, also be easy to expect directly adopting hydrochloric acid solution.Adopt hydrochloric acid solution as the demercuration oxidant, only control strategy is different from the ammonium chloride oxidant.It is two closed loops alone that SCR denitration control and demercuration are controlled, and demercuration oxidizer salt acid solution flow control valve 22 aperture signals do not need to feed back to SCR denitrification reducing agent flow control valve 42 and regulate denitrification reducing agent flow 43.
Embodiment 3:
On the basis of embodiment 1 and 2, can be by adjusting simultaneously demercuration oxidizing agent solution concentration and/or amount control mercury emissions concentration and denitration efficiency.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims (7)

1. the device of a gas mercury cooperation-removal, the SCR denitrification reducing agent feedway that comprises the SCR denitrating system, SCR denitrification reducing agent injection device, SCR denitrification apparatus reactor, deduster and wet flue gas desulfurizer, it is characterized in that: also comprise demercuration oxidant feedway, air mixing device, it is respectively equipped with connection boiler heat primary air or hot Secondary Air and described demercuration oxidant feedway described air mixing device, the entrance of SCR denitrification reducing agent feedway, and the outlet that is communicated with described SCR denitrification reducing agent injection device, and go out described, also be provided with air mixer between entrance, be provided with the flue gas blender between described SCR denitrification reducing agent injection device and SCR denitrification apparatus reactor.
2. gas mercury cooperation-removal device as claimed in claim 1, it is characterized in that: the connection boiler heat primary air of described air mixing device or hot Secondary Air entrance are communicated with the air preheater of described SCR denitrification apparatus reactor downstream.
3. gas mercury cooperation-removal device as claimed in claim 1, it is characterized in that: before described wet flue gas desulfurizer downstream, the final discharging of flue gas, also be provided with the mercury on-line detector, described demercuration oxidant feedway is electrically connected to described mercury on-line detector, closed-loop control, according to the mercury emissions concentration signal of its feedback, control the concentration and/or the amount that spray into the demercuration oxidant in described air mixing device.
4. gas mercury cooperation-removal device as claimed in claim 1, it is characterized in that: described demercuration oxidant feedway is the device that reproduces the SCR denitrification reducing agent, it is electrically connected to described SCR denitrification reducing agent feedway, closed-loop control; Described SCR denitrification apparatus reactor upstream and downstream flue also is provided with the NOx in-line analyzer, described SCR denitrification reducing agent feedway is electrically connected to described NOx in-line analyzer, closed-loop control, according to the amount of the demercuration oxidant of the NOx concentration of emission signal of its feedback and described demercuration oxidant feedway feedback, control the concentration and/or the amount that pass into the SCR denitrification reducing agent in described air mixing device.
5. gas mercury cooperation-removal device as claimed in claim 1, it is characterized in that: described demercuration oxidant feedway comprises demercuration oxidizing agent solution spray gun, and the demercuration oxidizing agent solution pipeline, the compressed-air line that are equipped with flowmeter and control valve, described demercuration oxidizing agent solution spray gun is comprised of nozzle, inner sleeve, outer tube, inner sleeve interface and outer tube interface, and described inside and outside cover interface tube connects respectively described demercuration oxidizing agent solution pipeline or compressed-air line separately.
6. gas mercury cooperation-removal device as claimed in claim 1, it is characterized in that: described SCR denitrification reducing agent feedway is the reductant line that is provided with flowmeter and control valve.
7. as the described gas mercury cooperation-removal of arbitrary claim device in claim 1 to 6, it is characterized in that: described SCR denitrification reducing agent injection device is reducing agent injection grid.
CN 201220647597 2012-11-30 2012-11-30 Device for synergistically removing flue gas mercury Active CN202962241U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102989282A (en) * 2012-11-30 2013-03-27 东方电气集团东方锅炉股份有限公司 Method and device for collaborative removal of mercury in flue gas
CN108479389A (en) * 2018-04-27 2018-09-04 华中科技大学 A kind of flue gas collaboration denitration demercuration system and method
CN109603456A (en) * 2019-01-25 2019-04-12 米凯利科技(北京)有限公司 Utilize the dry method flue gas demercuration system of halide crystal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102989282A (en) * 2012-11-30 2013-03-27 东方电气集团东方锅炉股份有限公司 Method and device for collaborative removal of mercury in flue gas
CN108479389A (en) * 2018-04-27 2018-09-04 华中科技大学 A kind of flue gas collaboration denitration demercuration system and method
CN108479389B (en) * 2018-04-27 2021-03-26 华中科技大学 Flue gas synergistic denitration and demercuration system and method
CN109603456A (en) * 2019-01-25 2019-04-12 米凯利科技(北京)有限公司 Utilize the dry method flue gas demercuration system of halide crystal
CN109603456B (en) * 2019-01-25 2021-08-03 米凯利科技(北京)有限公司 Dry flue gas demercuration system using halide crystals

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