CN102350208B - Flue gas absorbent which simultaneously has functions of desulphurization and denitration and preparation method and application thereof - Google Patents

Flue gas absorbent which simultaneously has functions of desulphurization and denitration and preparation method and application thereof Download PDF

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CN102350208B
CN102350208B CN 201110180187 CN201110180187A CN102350208B CN 102350208 B CN102350208 B CN 102350208B CN 201110180187 CN201110180187 CN 201110180187 CN 201110180187 A CN201110180187 A CN 201110180187A CN 102350208 B CN102350208 B CN 102350208B
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flue gas
deionized water
absorbent
sodium
potassium
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CN102350208A (en
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赵毅
韩颖慧
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North China Electric Power University
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North China Electric Power University
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Abstract

The invention discloses a flue gas absorbent which simultaneously has functions of desulphurization and denitration and a preparation method and an application thereof. Calculated according to 1L of deionized water, the flue gas absorbent provided by the invention is composed of 1.66-594g of an oxidizing agent, 3.8-1144g of a buffering agent, 2.7-222g of a stabilizing agent and 1L of deionized water. The preparation method provided by the invention comprises the following steps of: adding the buffering agent into 1L of deionized water, dissolving and uniformly mixing, adding the stabilizing agent, dissolving and uniformly mixing, adding the oxidizing agent, fully dissolving and uniformly mixing to obtain the absorbent. The absorbent provided by the invention and a calcium-based absorbent are simultaneously used so as to realize desulphurization and denitration in a same device, have high removal efficiency, and have less corrosion to the device with no discharge of desulphurization wastewater. In addition, desulphurization byproducts are dry, which is in favor of comprehensive utilization, disposal and stacking.

Description

A kind of flue gas and desulfurizing and denitrifying absorbent and its preparation method and application
Technical field
The invention belongs to the gas cleaning process field, relate to a kind of gas cleaning and handle absorbent and application thereof, relate in particular to a kind of flue gas and desulfurizing and denitrifying absorbent and its preparation method and application.
Background technology
At present, fossil fuel such as coal, oil, natural gas etc. are still human main energy sources.As everyone knows, the SO of its combustion process discharging 2And NO xCan form acid rain and other secondary pollution, badly influence Human's production and life, and caused enormous economic loss, relevant data to show, the annual economic loss that causes because of acid rain of China is about 1,100 hundred million yuans.Therefore, the control that pernicious gases such as sulfur dioxide, nitrogen oxide are polluted and purify most importantly is related to development and national economy, especially sustainable development.
For sulfur dioxide and discharged nitrous oxides control, the means that flue gas desulfurization, equipment for denitrifying flue gas are set respectively in the tail flue gas section of boiler have almost all been adopted at present both at home and abroad.Problems such as this flue gas classification administration way ubiquity floor space is big, equipment investment and operating cost and energy consumption height, flue gas system poor stability have restricted the effective control of coal-fired flue-gas multi-pollutant under low fee condition.Therefore, exploitation has the flue gas and desulfurizing and denitrifying new technology that equipment investment is few, operating cost is low becomes the great demand that domestic and international coal-fired flue-gas pollutant is controlled.
The dry process that with flue gas circulating fluidized bed is representative has small investment, and advantages such as operating cost is low, equipment is simple, water saving come into one's own day by day.The subject matter of the current existence of dry technique be that removal efficiency is relatively low, the absorbent preparation process is loaded down with trivial details and utilization rate low etc.A kind of flue gas desulfuration and denitrification purification method and device are disclosed in the Chinese patent 200310103954.7, it is that spraying into a kind of in circulating fluid bed reactor is the solid highly active absorbent of basic substance with flyash, lime, additive, absorbs sulfur in smoke SO 2With nitrogen oxide NO xUtilize feed back leg on the dust arrester will be not the highly active absorbent of complete reaction send back to and recycle in the charge pipe, but the preparation process of the highly active absorbent of the method is loaded down with trivial details.Disclose the integrated twin-stage fountain of a kind of flue gas and desulfurizing and denitrifying absorption reactor thermally in the Chinese patent 200720036607.0, comprised cylindrical shell, the one-level absorption reactor thermally, the secondary absorption reactor thermally, one-level absorption reactor thermally smoke inlet, one-level gas distributor, the one-level collecting tank, the one-level demister, one-level spray thrower, secondary absorption reactor thermally exhanst gas outlet, the secondary collecting tank, the secondary gas distributor, the secondary spray thrower, one-level demister and secondary gas distributor are by channel connection.And the flow of flue gas mode upwards become earlier upwards by single, the downward type of flow in back reduced the spatial altitude of flue gas purifying equipment, but the method equipment is loaded down with trivial details, floor space is big, can expect that this method is invested when practical engineering application and operating cost will be very huge.
In addition, desulphurization denitration when realizing under the low expense, the preparation of some desulfurization denitrification agents in the past adopts chloric strong oxidant to make additive more, as Chinese patent 200610051721.0 and Chinese patent 200610012525.2, though removal efficiency is higher, but easily produce equipment corrosion, and bring secondary pollution problems.
Summary of the invention
Purpose of the present invention solves the above-mentioned problems in the prior art exactly, a kind of flue gas and desulfurizing and denitrifying absorbent and its preparation method and application is provided, this absorbent and calcium-base absorbing agent use simultaneously that both can be implemented in the same equipment can desulfurization, purpose that again can denitration, and the removal efficiency height, less to equipment corrosion, no desulphurization denitration discharge of wastewater, and the desulphurization denitration byproduct is dry state, stacks favourable to comprehensive utilization and disposal.
For achieving the above object, technical solution of the present invention is: a kind of flue gas and desulfurizing and denitrifying absorbent, calculate according to the consumption that uses the 1L deionized water, the deionized water of the buffer of its oxidant by 1.66~594g, 3.8~1144g, the stabilizing agent of 2.7~222g and 1L is formed; Described oxidant is purity greater than 98% potassium ferrate K 2FeO 4Perhaps purity is greater than 98% Na2Fe04 Na 2FeO 4Described buffer is borax Na 2B 4O 710H 2O and potassium dihydrogen phosphate KH 2PO 4In at least a; Described stabilizing agent is sodium sulfite Na 2SO 3, sodium metasilicate Na 2SiO 3, sodium peroxydisulfate Na 2S 2O 8, SODIUM PERCARBONATE 2Na 2CO 33H 2O 2, clorox NaClO, sodium chlorite NaClO 2, sodium phosphate Na 3PO 4, potassium chlorate KClO 3, potash K 2CO 3, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H 5Na 3O 72H 2At least a among the O.
The preparation method of flue gas and desulfurizing and denitrifying absorbent described above: it may further comprise the steps:
(1) buffer of the described amount of adding in the deionized water of 1L obtains cushioning liquid behind the dissolving mixing;
(2) add the stabilizing agent of described amount in the above-mentioned cushioning liquid, behind the dissolving mixing, add the oxidant of described amount again, fully dissolve mixing and namely get absorbent.
Flue gas and desulfurizing and denitrifying absorbent described above is containing SO 2And NO xApplication in the flue gas, it uses in semi-dry flue gas desulfurization device, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2Determine with the concentration of NOx.
The present invention is 7~11 humidification water or directly described flue gas and desulfurizing and denitrifying absorbent is sneaked in the solid phase calcium-base absorbing agent that uses in the semi-dry flue gas desulfurization device by the semidry method humidification process pH value that the described flue gas and desulfurizing and denitrifying absorbent of input is made in the semi-dry flue gas desulfurization device, spray into the pH value again and be 7~11 humidification water, making the interior ambient humidity of desulfurizer is 3~10%, the pH value is 7~11, calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N), when the input flue-gas temperature is 100~150 ℃, in semi-dry flue gas desulfurization device, realize gas, liquid, originally three alternate collisional activations, collisional activation process do not possess solid phase calcium-base absorbing agent and the quick oxidation of absorbent of the present invention of denitration function and absorb SO in the flue gas Gu can make 2And NO x, it is oxidized to SO 4 2-, NO 3 -And NO 2 -Thereby, remove SO in the flue gas 2And NO x, realize sulphur, the integrated purpose that removes of nitrogen oxide while in the flue gas.Its main chemical reactions is as follows:
SO 2+H 2O→H 2SO 3 (1)
Ca(OH) 2+H 2SO 3→CaSO 3+2H 2O (2)
CaSO 3+ Fe (VI) (oxidant)+NO → CaSO 4+ Fe (III) (reduzate)+NO 2(3)
NO+Fe (VI) (oxidant) → NO 2+ Fe (III) (reduzate) (4)
3NO 2+H 2O→2HNO 3+NO (5)
NO 2+NO+H 2O→2HNO 2 (6)
Ca(OH) 2+2HNO 3→Ca(NO 3) 2+2H 2O (7)
Ca(OH) 2+2HNO 2→Ca(NO 2) 2+2H 2O (8)
Flue gas and desulfurizing and denitrifying absorbent of the present invention can be under the prerequisite of not setting up new commercial plant, when using simultaneously with common calcium-base absorbing agent, it not only self has good denitration function, and when strengthening common calcium-base absorbing agent desulfuration efficiency, also make it have the denitration function, realized the modification of common calcium-base absorbing agent, made it have oxidation susceptibility.The present invention has the removal efficiency height, and preparation temperature is low, and it is easy, easy to use to prepare, the utilization rate height, floor space is little, and expense is low, be beneficial to old power plant and transform, can not produce secondary pollution and other side effect, desulfurization ash in the flue gas processing procedure and be dry state, stack favourable to comprehensive utilization and disposal.Simultaneously heavy metals such as Hg, As are also had higher removal efficiency, its investment and operating cost are low, stable, easy to utilize.Test shows, the present invention be used in flue gas circulating fluidized bed in, be 15~300m at flue gas flow 3/ h, the particle circulating ratio is 0.31kg/m 2S, gas residence time is 1.4~4.8 seconds, humidity is 3~10%, the pH value is 7~11, entrance flue gas temperature is that 100~150 ℃, calcium sulphur nitrogen are under 0.6~1.8 the condition than Ca/ (S+N), the removal efficiency of sulfur dioxide is more than 98%, removal of nitrogen oxide efficient is more than 72%, the absorbent utilization rate reaches more than 96%, its removal efficiency height.In addition, the present invention is less to the corrosivity of equipment such as the flue in desulfurizer and downstream thereof, chimney, can not adopt smoke re-heater, can not carry out preservative treatment to existing chimney; No desulfurization wastewater discharging.The present invention can carry out flue gas desulfurization and denitrification at same set of equipment, overcome that existing flue gas desulfurization and denitrification adopts the equipment investment and the operating cost height that install desulfurizer and denitrification apparatus respectively additional and exist, occupation of land face is big and shortcoming such as flue gas system complexity, also solved the problem that the desulfurization ash that produces in the prior art is difficult to utilize.
The specific embodiment
Be further described this law is bright below in conjunction with specific embodiment.
Embodiment 1: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% Na2Fe04 Na by the purity of 1.66g 2FeO 4, 300g borax Na 2B 4O 710H 2The sodium sulfite Na of O, 2.7g 2SO 3Form with the deionized water of 1L.The borax Na that in the deionized water of 1L, adds described amount 2B 4O 710H 2O obtains cushioning liquid behind the dissolving mixing; The sodium sulfite Na that in cushioning liquid, adds described amount 2SO 3, behind the dissolving mixing, the purity that adds described amount again is greater than 98% Na2Fe04 Na 2FeO 4, fully dissolve mixing and namely get absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 150m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach 72%.
Embodiment 2: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% potassium ferrate K by the purity of 594g 2FeO 4, 3.8g potassium dihydrogen phosphate KH 2PO 4, 2.7g sodium metasilicate Na 2SiO 3Form with the deionized water of 1L.The potassium dihydrogen phosphate KH that in the deionized water of 1L, adds described amount 2PO 4, obtain cushioning liquid behind the dissolving mixing; The sodium metasilicate Na that in cushioning liquid, adds described amount 2SiO 3Behind the dissolving mixing, the purity that adds described amount again is greater than 98% potassium ferrate K 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 220m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach 73%.
Embodiment 3: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% Na2Fe04 Na by the purity of 332g 2FeO 4, 1144g potassium dihydrogen phosphate KH 2PO 4, 222g sodium peroxydisulfate Na 2S 2O 8Form with the deionized water of 1L.The potassium dihydrogen phosphate KH that in the deionized water of 1L, adds described amount 2PO 4, obtain cushioning liquid behind the dissolving mixing; The sodium peroxydisulfate Na that in cushioning liquid, adds described amount 2S 2O 8Behind the dissolving mixing, the purity that adds described amount again is greater than 98% Na2Fe04 Na 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.When SO2 concentration at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 200m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach 75%.
Embodiment 4: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% potassium ferrate K by the purity of 198g 2FeO 4, 500g borax Na 2B 4O 710H 2The SODIUM PERCARBONATE 2Na of O, 50g 2CO 33H 2O 2Form with the deionized water of 1L.The borax Na that in the deionized water of 1L, adds described amount 2B 4O 710H 2O obtains cushioning liquid behind the dissolving mixing; The SODIUM PERCARBONATE 2Na that in cushioning liquid, adds described amount 2CO 33H 2O 2Behind the dissolving mixing, the purity that adds described amount again is greater than 98% potassium ferrate K 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 150m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach 75%.
Embodiment 5: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% potassium ferrate K by the purity of 5.94g 2FeO 4, 3.80g borax Na 2B 4O 710H 2The clorox NaClO of O, 7.44g and the deionized water of 1L are formed.The borax Na that in the deionized water of 1L, adds described amount 2B 4O 710H 2O obtains cushioning liquid behind the dissolving mixing; Add the clorox NaClO dissolving mixing of described amount in cushioning liquid after, the purity that adds described amount again is greater than 98% potassium ferrate K 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 39.24m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach more than 72%.
Embodiment 6: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% Na2Fe04 Na by the purity of 33.2g 2FeO 4, 3.8g potassium dihydrogen phosphate KH 2PO 4, 13.75g borax Na 2B 4O 710H 2The sodium chlorite NaClO of O, 18.1g 2Form with the deionized water of 1L.The potassium dihydrogen phosphate KH that in the deionized water of 1L, adds described amount 2PO 4Borax Na with described amount 2B 4O 710H 2The mixture of O obtains cushioning liquid behind the dissolving mixing; The sodium chlorite NaClO that in cushioning liquid, adds described amount 2Behind the dissolving mixing, the purity that adds described amount again is greater than 98% Na2Fe04 Na 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 20m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach more than 75%.
Embodiment 7: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% Na2Fe04 Na by the purity of 500g 2FeO 4, 100g potassium dihydrogen phosphate KH 2PO 4, 30g sodium phosphate Na 3PO 4Form with the deionized water of 1L.The potassium dihydrogen phosphate KH that in the deionized water of 1L, adds described amount 2PO 4, obtain cushioning liquid behind the dissolving mixing; The sodium phosphate Na that in cushioning liquid, adds described amount 3PO 4Behind the dissolving mixing, the purity that adds described amount again is greater than 98% Na2Fe04 Na 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 200m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach 75%.
Embodiment 8: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% potassium ferrate K by the purity of 99g 2FeO 4, 38g borax Na 2B 4O 710H 2The potassium chlorate KClO of O, 23g 3, potash K 2CO 3, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H 5Na 3O 72H 2The deionized water of a kind of and 1L among the O is formed.The borax Na that in the deionized water of 1L, adds described amount 2B 4O 710H 2O obtains cushioning liquid behind the dissolving mixing; The potassium chlorate KClO that in cushioning liquid, adds described amount 3, potash K 2CO 3,, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H 5Na 3O 72H 2Behind a kind of dissolving mixing among the O, the purity that adds described amount again is greater than 98% potassium ferrate K 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 39.24m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach more than 72%.
Embodiment 9: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% Na2Fe04 Na by the purity of 50g 2FeO 4, 200g potassium dihydrogen phosphate KH 2PO 4, 80g sodium sulfite Na 2SO 3, sodium metasilicate Na 2SiO 3, sodium peroxydisulfate Na 2S 2O 8, SODIUM PERCARBONATE 2Na 2CO 33H 2O 2, clorox NaClO, sodium chlorite NaClO 2, sodium phosphate Na 3PO 4, potassium chlorate KClO 3, potash K 2CO 3,, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H 5Na 3O 72H 2Any two combination among the O and the deionized water of 1L are formed.The potassium dihydrogen phosphate KH that in the deionized water of 1L, adds described amount 2PO 4, obtain cushioning liquid behind the dissolving mixing; The sodium sulfite Na that in cushioning liquid, adds described amount 2SO 3, sodium metasilicate Na 2SiO 3, sodium peroxydisulfate Na 2S 2O 8, SODIUM PERCARBONATE 2Na 2CO 33H 2O 2, clorox NaClO, sodium chlorite NaClO 2, sodium phosphate Na 3PO 4, potassium chlorate KClO 3, potash K 2CO 3,, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H 5Na 3O 72H 2Behind any two combination dissolving mixing among the O, the purity that adds described amount again is greater than 98% Na2Fe04 Na 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 300m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach 80%.
Embodiment 10: the desulphurization denitration absorbent of present embodiment, calculate according to the consumption that uses the 1L deionized water, and it is greater than 98% potassium ferrate K by the purity of 150g 2FeO 4, 400g borax Na 2B 4O 710H 2The sodium sulfite Na of O, 200g 2SO 3, sodium metasilicate Na 2SiO 3, sodium peroxydisulfate Na 2S 2O 8, SODIUM PERCARBONATE 2Na 2CO 33H 2O 2, clorox NaClO, sodium chlorite NaClO 2, sodium phosphate Na 3PO 4, potassium chlorate KClO 3, potash K 2CO 3, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H5Na 3O 72H 2Any three or any four or any five or any six or any seven or any eight or any nine or any ten among the O or any 11 or any 12 or any 13 or any 14 or 15 s' combination and the deionized water of 1L are formed.The borax Na that in the deionized water of 1L, adds described amount 2B 4O 710H 2O obtains cushioning liquid behind the dissolving mixing; The sodium sulfite Na that in cushioning liquid, adds described amount 2SO 3, sodium metasilicate Na 2SiO 3, sodium peroxydisulfate Na 2S 2O 8, SODIUM PERCARBONATE 2Na 2CO 33H 2O 2, clorox NaClO, sodium chlorite NaClO 2, sodium phosphate Na 3PO 4, potassium chlorate KClO 3, potash K 2CO 3, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H 5Na 3O 72H 2Behind any three or any four or any five or any six or any seven or any eight or any nine or any ten among the O or any 11 or any 12 or any 13 or any 14 or 15 s' the combination dissolving mixing, the purity that adds described amount again is greater than 98% potassium ferrate K 2FeO 4Fully the dissolving mixing namely gets absorbent.The desulphurization denitration absorbent uses in semi-dry flue gas desulfurization device the time described above, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).The consumption of described absorbent is by SO in exhaust gas volumn and the flue gas 2And NO xConcentration determine.Work as SO 2Concentration is at 1500~2000mg/m 3, NO concentration is at 500~1000mg/m 3, flue gas flow is 225m 3During/h, its desulfuration efficiency can reach 98%, and denitration efficiency can reach 75%.

Claims (8)

1. flue gas and desulfurizing and denitrifying absorbent is characterized in that: calculate according to the consumption that uses the 1L deionized water, the deionized water of the buffer of its oxidant by 1.66~594g, 3.8~1144g, the stabilizing agent of 2.7~222g and 1L is formed; Described oxidant is purity greater than 98% potassium ferrate K 2FeO 4Perhaps purity is greater than 98% Na2Fe04 Na 2FeO 4Described buffer is borax Na 2B 4O 710H 2O and potassium dihydrogen phosphate KH 2PO 4In at least a; Described stabilizing agent is sodium sulfite Na 2SO 3, sodium metasilicate Na 2SiO 3, sodium peroxydisulfate Na 2S 2O 8, SODIUM PERCARBONATE 2Na 2CO 33H 2O 2, clorox NaClO, sodium chlorite NaClO 2, sodium phosphate Na 3PO 4, potassium chlorate KClO 3, potash K 2CO 3, potassium metaperiodate KIO 4, potassium peroxydisulfate K 2S 2O 8, ammonium persulfate (NH 4) 2S 2O 8, calcium hypochlorite Ca (ClO) 2, sodium acetate CH 3COONa and trisodium citrate C 6H 5Na 3O 72H 2At least a among the O.
2. flue gas and desulfurizing and denitrifying absorbent according to claim 1 is characterized in that: calculate according to the consumption that uses the 1L deionized water, it is greater than 98% Na2Fe04 Na by the purity of 332g 2FeO 4, 1144g potassium dihydrogen phosphate KH 2PO 4, 222g sodium peroxydisulfate Na 2S 2O 8Form with the deionized water of 1L.
3. flue gas and desulfurizing and denitrifying absorbent according to claim 1 is characterized in that: calculate according to the consumption that uses the 1L deionized water, it is greater than 98% potassium ferrate K by the purity of 198g 2FeO 4, 500g borax Na 2B 4O 710H 2The SODIUM PERCARBONATE 2Na of O, 50g 2CO 33H 2O 2Form with the deionized water of 1L.
4. flue gas and desulfurizing and denitrifying absorbent according to claim 1 is characterized in that: calculate according to the consumption that uses the 1L deionized water, it is greater than 98% potassium ferrate K by the purity of 5.94g 2FeO 4, 3.80g borax Na 2B 4O 710H 2The clorox NaClO of O, 7.44g and the deionized water of 1L are formed.
5. flue gas and desulfurizing and denitrifying absorbent according to claim 1 is characterized in that: calculate according to the consumption that uses the 1L deionized water, it is greater than 98% Na2Fe04 Na by the purity of 33.2g 2FeO 4, 3.8g potassium dihydrogen phosphate KH 2PO 4, 13.75g borax Na 2B 4O 710H 2The sodium chlorite NaClO of O, 18.1g 2Form with the deionized water of 1L.
6. flue gas and desulfurizing and denitrifying absorbent according to claim 1 is characterized in that: calculate according to the consumption that uses the 1L deionized water, it is greater than 98% Na2Fe04 Na by the purity of 500g 2FeO 4, 100g potassium dihydrogen phosphate KH 2PO 4, 30g sodium phosphate Na 3PO 4Form with the deionized water of 1L.
7. the preparation method of each described flue gas and desulfurizing and denitrifying absorbent of claim 1-6 is characterized in that it may further comprise the steps:
(1) buffer of the described amount of adding in the deionized water of 1L obtains cushioning liquid behind the dissolving mixing;
(2) add the stabilizing agent of described amount in the above-mentioned cushioning liquid, behind the dissolving mixing, add the oxidant of described amount again, fully dissolve mixing and namely get absorbent.
8. each described flue gas and desulfurizing and denitrifying absorbent of claim 1-6 is containing SO 2And NO xApplication in the flue gas is characterized in that, it uses in semi-dry flue gas desulfurization device, and it requires in the desulfurizer, and ambient humidity is 3~10%, the pH value is 7~11, and entrance flue gas temperature is 100~150 ℃, and calcium sulphur nitrogen is 0.6~2.8 than Ca/ (S+N).
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