CN102614735A - Device and method for smoke desulphurization and waste recycle - Google Patents

Device and method for smoke desulphurization and waste recycle Download PDF

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Publication number
CN102614735A
CN102614735A CN2012101096498A CN201210109649A CN102614735A CN 102614735 A CN102614735 A CN 102614735A CN 2012101096498 A CN2012101096498 A CN 2012101096498A CN 201210109649 A CN201210109649 A CN 201210109649A CN 102614735 A CN102614735 A CN 102614735A
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outlet
desulfurizing tower
ammonium sulfate
thickener
ammonia
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CN2012101096498A
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Chinese (zh)
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刘喜才
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大连华氏流体设备有限公司
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Abstract

The invention discloses a device and a method for smoke desulphurization and waste recycle. The device comprises an electrostatic precipitator, a desulfurizing tower, an art water tank, a filter, an evaporative crystallizer, a thickener, a centrifugal machine, a fluidized bed dryer, a primary liquid tank, an ammonia tank and an oxidation fan. The filter is a multi-tube bag type filter, the multi-tube bag type filter comprises a body, a partition and filter core. The multi-tube bag type filter is introduced on an application point of a revolving liquid separator according to the invention, thus the entrained residual in ammonium sulfate serosity which is a side product of ammonia method for desulphurization can be effectively removed, the quality of ammonium sulfate product is promoted, the solid and liquid ratio in the desulfurizing tower and serosity pool area is not required to ensure, sediment cleaning difficulty in the desulfurizing tower and serosity pool area is relieved, and economic benefit is increased. The thickener is introduced at the back of the evaporative crystallizer by the invention, so high-content of ammonium sulfate crystal is obtained, the time of sedimentation and separation by the centrifugal machine is shortened, the separation is faster, and the separation effect of the centrifugal machine is improved.

Description

The apparatus and method of a kind of flue gas desulfurization and discarded object recycling

Technical field

The present invention relates to a kind of flue gas desulfurization technique, particularly a kind of ammonia process of desulfurization and discarded object recycling can obtain the apparatus and method of the flue gas desulfurization and the discarded object recycling of byproduct of ammonium sulfate chemical fertilizer.

Background technology

At present, in China's energy resources structure, coal is occupied an leading position.Coal fire discharged sulfur dioxide is the major pollution thing, surpasses 2,000 ten thousand tons for years, occupies first place in the world, and therefore sulfur in smoke is recycled to have crucial meaning.

Flue gas desulfurization is the desulfurization method of unique in the world large-scale commercial applications application at present, and the flue gas desulfurization technique of countries in the world research and development and commercial application is estimated above 200 kinds.Large quantities of external flue gas desulfurization techniques are introduced into domestic by different desulfurization companies, this overwhelming majority wherein is a limestone-gypsum method.Along with the flue gas desulfurization extensive use of every profession and trade at home, other fume desulphurization methods also are used gradually, are familiar with, and comprise seawater method, ammonia process, magnesium method, two alkaline process etc.This wherein, ammonia process is just receiving concern more and more widely.Ammonia flue gas desulfurization technique is to adopt ammonia to make absorbent, and the SO in the flue gas is removed in reaction 2, obtain the byproduct of ammonium sulfate chemical fertilizer, do not consume new natural resources, non-secondary pollution is turned waste into wealth, and turns harm into good, and is the flue gas desulfurization technique of a kind of zero-emission, low-carbon (LC), environmental protection, recovery and reuse of waste.

Ammonia desulfurizing process is: flue gas gets into desulfurizing tower behind electrostatic precipitation; The ammonium sulfurous that reaction generates is converted into ammonium sulfate through peroxidating, the ammonium sulfate after concentrating; Be pumped into cyclone hydraulic separators by high pressure ammonium sulfate and carry out liquid-solid separation; Isolated ammonium sulfate gets into centrifugal separator and dewaters, and gets into drying machine again and carries out drying, can obtain ammonium sulfate product.

But there is following shortcoming in existing technology:

1, cyclone hydraulic separators directly carries out Separation of Solid and Liquid with the ammonium sulfate that desulfurizing tower stock tank district takes out, and requires technology to guarantee the solid-to-liquid ratio in desulfurizing tower stock tank district, causes the difficult cleaning of desulfurizing tower basic sediment, mixing plant at the bottom of the damage tower.

2, ammonium sulfate is handled without removal of impurities, influences the quality of ammonium sulfate product.

3, traditional simple and easy ammonia process of desulfurization mainly utilizes the H under the gas phase condition 2O, NH 3With SO 2Between the easy reaction device of fast reaction design, say that strictly simple and easy ammonia process is a kind of disposable ammonia process, its desulfurization product major part is the unsettled imonium salt of aerosol state, reclaims very difficulty, the economy of ammonia process can not embody; And desulfurization product has part after with the flue gas emptying again and decomposites SO 2, form secondary pollution.So this technology can only be used in environmental requirement low, wastewater source arranged, do not require on the device of long-time running.

Summary of the invention

The shortcoming and defect part that exists in the above-mentioned technology the objective of the invention is to design flue gas desulfurization and the apparatus and method of discarded object recycling that a kind ofly can improve the ammonium sulfate quality, need not guarantee solid-to-liquid ratio, no waste discharge, non-secondary pollution, the theory that meets recycling economy and the environmental protection industry development of desulfurizing tower bottom.

To achieve these goals, technical scheme of the present invention is following:

The device of a kind of flue gas desulfurization and discarded object recycling comprises electrostatic precipitator, desulfurizing tower, technology water tank, filter, crystallizing evaporator, thickener, centrifugal separator, sulfuration bed dryer, mother liquor tank, ammonia water tank and oxidation fan;

The exhanst gas outlet of described electrostatic precipitator is connected with the desulfurizing tower gas approach; The ammonium sulfate outlet of described desulfurizing tower is connected with the import of filter; The outlet of described filter is connected with the import of crystallizing evaporator; Described crystallizing evaporator crystal outlet is connected with the thickener import; Described thickener crystal outlet is connected with the centrifugal separator import; Described centrifugal separator crystal outlet is connected with the import of sulfuration bed dryer; Outlet is connected with the mother liquor tank import respectively with the centrifugal separator slurries for described crystallizing evaporator slurries outlet, the outlet of thickener slurries; Described desulfurizing tower is provided with stock tank district, spraying cooling district, uptake zone and removes the fog-zone by reverse-flow desulfurizing tower design; The absorption distribution grid is set in described uptake zone and spraying layer, the described fog-zone of removing are provided with the two-stage demister; Described desulfurizing tower upper gas outlet is connected with external flue; The outlet of described ammonia water tank is connected with the spray liquid import of desulfurizing tower; Demister is connected in the inlet of described technology water tank and the desulfurizing tower, and the flushing water of demister is provided; Described desulfurizing tower also is connected with the outlet of technology water tank, the outlet of mother liquor tank and the circulating water intake pipeline of desulfurizing tower respectively; Between the exhanst gas outlet of described electrostatic precipitator and desulfurizing tower gas approach, oxidation fan is installed;

Described filter is the multitube bag filter, and described multitube bag filter comprises body, dividing plate and filter core; Described body is connected through welding manner with dividing plate, and dividing plate and filter core are through being threaded; The filtering accuracy of described multitube bag filter is 5um.

Thickener of the present invention is multistage cyclone hydraulic separators, comprises eddy flow chamber, disengagement chamber and thickening chamber; Described eddy flow chamber and disengagement chamber welding, disengagement chamber and the welding of thickening chamber; Described eddy flow chamber comprises the import and the outlet of thickener, and the import of described thickener tangentially connects with the welding of eddy flow chamber, and the eddy flow chamber is connected through flange with the outlet of thickener; Described thickener outlet is positioned at top, eddy flow chamber.

The method of a kind of flue gas desulfurization and discarded object recycling may further comprise the steps:

A, flue gas are established device through electrostatic precipitation and are removed dust, get into desulfurizing tower through oxidation fan; Desulfurizing tower is divided into stock tank district, spraying cooling district, uptake zone and removes the fog-zone; Flue gas moves through ammonium sulfate spraying cooling zone vertically upward, and absorbent is through the nozzle of shower, and uniform vaporific grain pearl fills in the uptake zone; After flue gas adverse current contacts; The ammonium sulfite solution that reaction generates is pooled to the stock tank district that is positioned at the desulfurizing tower bottom, after air oxidation, generates ammonium sulfate, and the flue gas after the desulfurization is in removing fog-zone removal flue gas after the droplets entrained; Deliver to chimney through flue and enter atmosphere, the average sulfur content of exhanst gas outlet is controlled at 50mg/m 3Below;

B, when the ammonium sulfate slurry specific gravity in desulfurizing tower stock tank district reaches 1.2~1.3, concentration reaches 38%~42%, through pump the ammonium sulfate slurries sent into filter, removes the impurity in the ammonium sulfate;

C, the ammonium sulfate slurries that will remove impurity are sent into crystallizing evaporator, and the ammonium sulfate slurries are heating evaporation under reduced pressure, reach supersaturation and separate out ammonia sulfate crystal, and the temperature in the crystallizing evaporator is controlled at 40~50 ℃ further to separate out ammonium sulfate;

D, the ammonia sulfate crystal that generates is got into the eddy flow chamber by thickener eddy flow cavity segment with tangential direction; The ammonia sulfate crystal particle receives centrifugal action, and wall moves downward along thickener eddy flow chamber with the rotation slurries; Come downwards to disengagement chamber and carry out Separation of Solid and Liquid; The thin ammonia sulfate crystal particle that carries in the ammonium sulfate of clarification or the ammonium sulfate then rises; Gone out by the outlet overflow of thickener, ammonia sulfate crystal is by flowing to the thickening chamber under the helix, and the solid content of the spillway discharge control thickening chamber ammonia sulfate crystal of the outlet through the adjustment thickener; Described solid content is 40%~60%;

Ammonia sulfate crystal after E, the thickening gets into centrifugal separator; Under action of centrifugal force; The ammonium sulfate slurries constantly pass the inboard filter medium of bowl, and the discharge of the hole on wall rotary drum, and the ammonia sulfate crystal particle then is trapped in the surface of filter medium; Centrifugation through continuous obtains ammonia sulfate crystal;

F, the ammonia sulfate crystal after centrifugation get into the sulfuration bed dryer, and dried ammonium sulfate product can directly use as crops nitrogenous fertilizer.

The described reaction of steps A of the present invention comprises absorption and two chemical reaction processes of oxidation:

A1, absorption reaction: in desulfurizing tower, the SO in the flue gas 2After the ammonia absorbent contacted, reaction as follows took place:

NH 3+H 2O+5O 2=====NH 4HSO 3

2NH 3+H 2O+SO 2=====(NH 4) 2SO 3

(NH 4) 2SO 3+H 2O+SO 2=====2NH 4HSO 3

The acid salt NH that in absorption process, is generated 4HSO 3To SO 2Do not have absorbability, along with the carrying out of absorption process, the NH in the absorption liquid 4HSO 3Quantity increases, and the absorbability of absorption liquid descends, and therefore needs in absorption liquid, to replenish ammonia, makes part NH 4HSO 3Be converted into (NH 4) 2SO 3, the absorbability of raising absorption liquid;

NH 4HSO 3+NH 3=====(NH 4) 2SO 3

A2, oxidation reaction: oxidizing process is actually with compressed air and changes the sulphite in the absorption liquid into sulfate, and main oxidation reaction is following:

2(NH 4) 2SO 3+O 2=====2(NH 4) 2SO 4

Compared with prior art, the present invention has following beneficial effect:

1, because being used in, the present invention introduces the multitube bag filter on the point of application position of cyclone hydraulic separators; Can remove the impurity of carrying secretly in the ammonia process of desulfurization accessory substance ammonium sulfate slurries effectively; Improved the quality of ammonium sulfate product; Need not guarantee the solid-to-liquid ratio in desulfurizing tower stock tank district, alleviate desulfurizing tower stock tank district deposit cleaning difficulty, increase economic benefit.

2, because the present invention introduces thickener behind crystallizing evaporator; Can obtain the ammonia sulfate crystal of high-load, reduce the disposal ability of centrifugal separator, shorten the time of centrifugal separator sedimentation separation; Make to separate and accelerate, improved the separating effect of centrifugal separator.

3, because the present invention obtains stable ammonium sulfate product, can directly use as crops nitrogenous fertilizer, do not consume new natural resources; Non-secondary pollution; Turn waste into wealth, turn harm into good, be the flue gas desulfurization technique of a kind of zero-emission, low-carbon (LC), environmental protection, recovery and reuse of waste; Have tangible economic and social benefit, meet the theory of recycling economy and the new technology of environmental protection industry development.

Description of drawings

The present invention has 2 width of cloth accompanying drawings.

Fig. 1 is the process unit sketch map of a kind of flue gas desulfurization and discarded object recycling.

Fig. 2 is the process flow diagram of a kind of flue gas desulfurization and discarded object recycling.

Among the figure: 1, oxidation fan, 2, electrostatic precipitator, 3, ammonia water tank, 4, the technology water tank; 5, desulfurizing tower, 6, remove the fog-zone, 7, spraying layer, 8, the uptake zone; 9, spraying cooling district, 10, the stock tank district, 11, filter, 12, crystallizing evaporator; 13, thickener, 14, centrifugal separator, 15, the sulfuration bed dryer, 16, mother liquor tank.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described further.As shown in Figure 1; The device of a kind of flue gas desulfurization and discarded object recycling comprises electrostatic precipitator 2, desulfurizing tower 5, technology water tank 4, filter 11, crystallizing evaporator 12, thickener 13, centrifugal separator 14, sulfuration bed dryer 15, mother liquor tank 16, ammonia water tank 3 and oxidation fan 1;

The exhanst gas outlet of described electrostatic precipitator 2 is connected with desulfurizing tower 5 gas approach; The ammonium sulfate outlet of described desulfurizing tower 5 is connected with the import of filter 11; The outlet of described filter 11 is connected with the import of crystallizing evaporator 12; Described crystallizing evaporator 12 crystal outlet is connected with thickener 13 imports; Described thickener 13 crystal outlet is connected with centrifugal separator 14 imports; Described centrifugal separator 14 crystal outlet is connected with 15 imports of sulfuration bed dryer; Outlet is connected with mother liquor tank 16 imports respectively with centrifugal separator 14 slurries for described crystallizing evaporator 12 slurries outlet, the outlet of thickener 13 slurries; Described desulfurizing tower 5 is provided with stock tank district 10, spraying cooling district 9, uptake zone 8 and removes fog-zone 6 by reverse-flow desulfurizing tower 5 designs; The absorption distribution grid is set in described uptake zone 8 and spraying layer 7, the described fog-zone 6 of removing are provided with the two-stage demister; Described desulfurizing tower 5 upper gas outlet is connected with external flue; The outlet of described ammonia water tank 3 is connected with the spray liquid import of desulfurizing tower 5; Demister is connected in the inlet of described technology water tank 4 and the desulfurizing tower 5, and the flushing water of demister is provided; Described desulfurizing tower 5 also is connected with the outlet of technology water tank 4, the outlet of mother liquor tank 16 and the circulating water intake pipeline of desulfurizing tower 5 respectively; Between the exhanst gas outlet of described electrostatic precipitator 2 and desulfurizing tower 5 gas approach, oxidation fan 1 is installed;

Described filter 11 is a multitube bag filter 11, and described multitube bag filter 11 comprises body, dividing plate and filter core; Described body is connected through welding manner with dividing plate, and dividing plate and filter core are through being threaded; The filtering accuracy of described multitube bag filter 11 is 5um.

Thickener 13 of the present invention is multistage cyclone hydraulic separators, comprises eddy flow chamber, disengagement chamber and thickening chamber; Described eddy flow chamber and disengagement chamber welding, disengagement chamber and the welding of thickening chamber; Described eddy flow chamber comprises the import and the outlet of thickener 13, and the import of described thickener 13 tangentially connects with the welding of eddy flow chamber, and the eddy flow chamber is connected through flange with the outlet of thickener 13; Described thickener 13 outlets are positioned at top, eddy flow chamber.

As shown in Figure 2, the method for a kind of flue gas desulfurization and discarded object recycling may further comprise the steps:

A, flue gas are established device 2 through electrostatic precipitation and are removed dust, get into desulfurizing tower 5 through oxidation fan; Desulfurizing tower 5 is divided into stock tank district 10, spraying cooling district 9, uptake zone and removes fog-zone 6; Flue gas moves through ammonium sulfate spraying cooling district 9 vertically upward, and absorbent makes flue-gas temperature drop to 50~70 ℃ through the nozzle of shower; Uniform vaporific grain pearl fills in the uptake zone 8; After flue gas adverse current contacted, fully the SO2 washing absorbed, and the flue gas after the desulfurization is in removing fog-zone 6 removal flue gases after the droplets entrained; Enter atmosphere through desulfurizing tower 5 top exit flues, the average sulfur content of exhanst gas outlet is controlled at 50mg/m 3Below;

B, the stock tank district 10 that air is constantly introduced desulfurizing tower 5 through oxidation fan 1; Sulfite oxidation becomes sulfate of ammoniac, and pH is 5~6 in control, and the ammonium sulfate slurry specific gravity is 1.2~1.3; Ammonium sulfate is concentrated in the spraying cooling process; Concentration reaches 38%~42%, through being pumped into filter 11, removes the impurity in the ammonium sulfate;

C, the ammonium sulfate slurries that will remove impurity are sent in the crystallizing evaporator 12 and are further concentrated; Slurries are heating evaporation under reduced pressure; Solution reaches supersaturation and plate goes out ammonia sulfate crystal, and the temperature in the crystallizing evaporator 12 are controlled at 40~50 ℃ further to separate out ammonia sulfate crystal;

D, the ammonia sulfate crystal that generates is got into the eddy flow chamber by thickener 13 eddy flow cavity segments with tangential direction; Crystal grain is moved downward along thickener 13 eddy flow chamber walls with rotating liquid by centrifugal action; Come downwards to disengagement chamber and carry out Separation of Solid and Liquid; That carries in the ammonium sulfate of clarification or the solution then rises than the microlite particle, and a part is returned crystallizing evaporator 12 by the outlet overflow at center, and another part returns mother liquor tank 16 and returns desulfurizing tower 5 again; Acid ammonium crystal is by flowing to the thickening chamber under the helix, this moment, thickening chamber ammonia sulfate crystal content can reach 40%~60%, and this crystalline content can be controlled through the spillway discharge of adjustment outlet;

Ammonia sulfate crystal after E, the thickening gets into centrifugal separator 14, and under action of centrifugal force, liquid constantly passes the inboard filter medium of bowl; And rotary drum is discharged in the hole on wall; Solid particle then is trapped in the surface of filter medium, and the centrifugation through continuous obtains ammonia sulfate crystal;

F, the ammonium sulfate after centrifugation get into sulfuration bed dryer 15, and dried ammonium sulfate product can directly use as crops nitrogenous fertilizer.

Ammonia water tank 3 of the present invention is injected ammoniacal liquor through pump to desulfurizing tower 5 spray districts 7, and the addition of ammoniacal liquor is carried out On-line Control through the absorption liquid pH value, and keeping stock tank district 10 ammonium sulfate pH values is 5~6.

Technology water tank 4 of the present invention is connected with the spraying layer of desulfurizing tower 5 demisters front and back, and the flushing water of demister is provided.

Shown in Figure 1 is specific embodiment of the present invention; It is the technology of ammonia type flue gas desulfurizing and recovery and reuse of waste; Flue gas, ammoniacal liquor or ammonium sulfate liquor are sent into desulfurizing tower 5; And in described desulfurizing tower 5 stock tank districts 10 bubbling airs, described water and ammonia or ammonium sulfate form absorbent and with described flue gas counter current contacting in described desulfurizing tower 5; The mass percent concentration 20% of ammoniacal liquor, 10 taking-up proportions are 1.2 ammonium sulfate in described desulfurizing tower 5 stock tank districts, inject filter 11 through pump then and filter, and remove the impurity in the ammonium sulfate; The ammonium sulfate of removing impurity gets into crystallizing evaporator 12, and temperature is controlled at more than 40 ℃ in the described crystallizing evaporator 12, further to separate out ammonia sulfate crystal; The ammonia sulfate crystal that generates gets into thickener 13, carries out Separation of Solid and Liquid; Ammonia sulfate crystal after the thickening gets into centrifugal separator 14, and the centrifugation through continuous obtains ammonia sulfate crystal; , the ammonium sulfate after the centrifugation obtains ammonium sulfate product after getting into sulfuration bed drying.

Compared with present technology improved 15% through test ammonium sulfate output, desulfuration efficiency can reach more than 90%, purifies the back smoke emissioning concentration and is controlled at 50mg/m 3Below, and energy consumption has reduced by 16%.

Claims (4)

1. the device of flue gas desulfurization and discarded object recycling is characterized in that: comprise electrostatic precipitator (2), desulfurizing tower (5), technology water tank (4), filter (11), crystallizing evaporator (12), thickener (13), centrifugal separator (14), sulfuration bed dryer (15), mother liquor tank (16), ammonia water tank (3) and oxidation fan (1);
The exhanst gas outlet of described electrostatic precipitator (2) is connected with desulfurizing tower (5) gas approach; The ammonium sulfate outlet of described desulfurizing tower (5) is connected with the import of filter (11); The outlet of described filter (11) is connected with the import of crystallizing evaporator (12); The outlet of described crystallizing evaporator (12) crystal is connected with thickener (13) import; The outlet of described thickener (13) crystal is connected with centrifugal separator (14) import; The outlet of described centrifugal separator (14) crystal is connected with the import of sulfuration bed dryer (15); Outlet is connected with mother liquor tank (16) import respectively with centrifugal separator (14) slurries for the outlet of described crystallizing evaporator (12) slurries, the outlet of thickener (13) slurries; Described desulfurizing tower (5) is provided with stock tank district (10), spraying cooling district (9), uptake zone (8) and removes fog-zone (6) by reverse-flow desulfurizing tower (5) design; The absorption distribution grid is set in described uptake zone (8) and spraying layer (7), the described fog-zone (6) of removing are provided with the two-stage demister; The outlet of described desulfurizing tower (5) upper gas is connected with external flue; The outlet of described ammonia water tank (3) is connected with the spray liquid import of desulfurizing tower (5); The inlet of described technology water tank (4) is connected with the middle demister of desulfurizing tower (5), and the flushing water of demister is provided; Described desulfurizing tower (5) also is connected with the outlet of technology water tank (4), the outlet of mother liquor tank (16) and the circulating water intake pipeline of desulfurizing tower (5) respectively; Between the exhanst gas outlet of described electrostatic precipitator (2) and desulfurizing tower (5) gas approach, oxidation fan (1) is installed;
Described filter (11) is multitube bag filter (11), and described multitube bag filter (11) comprises body, dividing plate and filter core; Described body is connected through welding manner with dividing plate, and dividing plate and filter core are through being threaded; The filtering accuracy of described multitube bag filter (11) is 5um.
2. the device of a kind of flue gas desulfurization according to claim 1 and discarded object recycling is characterized in that: described thickener (13) is multistage cyclone hydraulic separators, comprises eddy flow chamber, disengagement chamber and thickening chamber; Described eddy flow chamber and disengagement chamber welding, disengagement chamber and the welding of thickening chamber; Described eddy flow chamber comprises the import and the outlet of thickener (13), and the import of described thickener (13) tangentially connects with the welding of eddy flow chamber, and the eddy flow chamber is connected through flange with the outlet of thickener (13); Described thickener (13) outlet is positioned at top, eddy flow chamber.
3. the method for flue gas desulfurization and discarded object recycling is characterized in that: may further comprise the steps:
A, flue gas are established device through electrostatic precipitation and are removed dust, get into desulfurizing tower (5) through oxidation fan (1); Desulfurizing tower (5) is divided into stock tank district (10), spraying cooling district (9), uptake zone (8) and removes fog-zone (6); Flue gas moves through territory, ammonium sulfate spraying cooling district (9) vertically upward, and absorbent is through the nozzle of shower, and uniform vaporific grain pearl fills in the uptake zone (8); After flue gas adverse current contacts; The ammonium sulfite solution that reaction generates is pooled to the stock tank district (10) that is positioned at desulfurizing tower (5) bottom, after air oxidation, generates ammonium sulfate, and the flue gas after the desulfurization is in removing fog-zone (6) removal flue gas after the droplets entrained; Deliver to chimney through flue and enter atmosphere, the average sulfur content of exhanst gas outlet is controlled at 50mg/m 3Below;
B, when the ammonium sulfate slurry specific gravity in desulfurizing tower (5) stock tank district (10) reaches 1.2~1.3, concentration reaches 38%~42%, through pump the ammonium sulfate slurries sent into filter (11), removes the impurity in the ammonium sulfate;
C, the ammonium sulfate slurries that will remove impurity are sent into crystallizing evaporator (12), and the ammonium sulfate slurries are heating evaporation under reduced pressure, reach supersaturation and separate out ammonia sulfate crystal, and the temperature in the crystallizing evaporator (12) is controlled at 40~50 ℃ further to separate out ammonium sulfate;
D, the ammonia sulfate crystal that generates is got into the eddy flow chamber by thickener (13) eddy flow cavity segment with tangential direction; The ammonia sulfate crystal particle receives centrifugal action, and wall moves downward along thickener (13) eddy flow chamber with the rotation slurries; Come downwards to disengagement chamber and carry out Separation of Solid and Liquid; The thin ammonia sulfate crystal particle that carries in the ammonium sulfate of clarification or the ammonium sulfate then rises; Gone out by the outlet overflow of thickener (13), ammonia sulfate crystal is by flowing to the thickening chamber under the helix, and the solid content of the spillway discharge control thickening chamber ammonia sulfate crystal of the outlet through adjustment thickener (13); Described solid content is 40%~60%;
Ammonia sulfate crystal after E, the thickening gets into centrifugal separator (14); Under action of centrifugal force; The ammonium sulfate slurries constantly pass the inboard filter medium of bowl, and the discharge of the hole on wall rotary drum, and the ammonia sulfate crystal particle then is trapped in the surface of filter medium; Centrifugation through continuous obtains ammonia sulfate crystal;
F, the ammonia sulfate crystal after centrifugation get into sulfuration bed dryer (15), and dried ammonium sulfate product can directly use as crops nitrogenous fertilizer.
4. the method for a kind of flue gas desulfurization according to claim 3 and discarded object recycling is characterized in that: the described reaction of steps A comprises absorption and two chemical reaction processes of oxidation:
A1, absorption reaction: in desulfurizing tower (5), the SO in the flue gas 2After the ammonia absorbent contacted, reaction as follows took place:
NH 3+H 2O+SO 2=====NH 4HSO 3
2NH 3+H 2O+SO 2=====(NH 4) 2SO 3
(NH 4) 2SO 3+H 2O+SO 2=====2NH 4HSO 3
The acid salt NH that in absorption process, is generated 4HSO 3To SO 2Do not have absorbability, along with the carrying out of absorption process, the NH in the absorption liquid 4HSO 3Quantity increases, and the absorbability of absorption liquid descends, and therefore needs in absorption liquid, to replenish ammonia, makes part NH 4HSO 3Be converted into (NH 4) 2SO 3, the absorbability of raising absorption liquid;
NH 4HSO 3+NH 3=====(NH 4) 2SO 3
A2, oxidation reaction: oxidizing process is actually with compressed air and changes the sulphite in the absorption liquid into sulfate, and main oxidation reaction is following:
2(NH 4) 2SO 3+O 2=====2(NH 4) 2SO 4
CN2012101096498A 2012-04-13 2012-04-13 Device and method for smoke desulphurization and waste recycle CN102614735A (en)

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Cited By (9)

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CN103041687A (en) * 2012-12-18 2013-04-17 北京威肯众合环保科技有限公司 Oil furnace flue gas purification compound tower integrating dust removal, smoke abatement and desulphurization
CN103752117A (en) * 2014-01-23 2014-04-30 上海龙净环保科技工程有限公司 Smoke-gas treatment system and method of integrated desulfuration and PM2.5 (Fine Particulate Matter) desorption by adopting ammonia process
CN104906935A (en) * 2015-05-29 2015-09-16 中冶焦耐工程技术有限公司 Acid-making tail gas purification process and acid-making tail gas purification device
CN105032154A (en) * 2015-07-29 2015-11-11 安徽工业大学 Ammonia desulphurization absorbent product S<4+> oxidation system and optimal regulation and control method
CN105148669A (en) * 2015-09-16 2015-12-16 河南心连心化肥有限公司 Dust recycling device and recycling method thereof
CN105749578A (en) * 2016-05-14 2016-07-13 张波 Ammonia process desulfurization, crystallization and separation device and process
CN105771307A (en) * 2016-05-14 2016-07-20 张波 Ammonia desulphurization after-treatment two-stage thickening system and ammonia desulphurization after-treatment two-stage thickening process
CN106731620A (en) * 2017-03-24 2017-05-31 合肥天翔环境工程有限公司 A kind of spray desulfurizing tower
CN107648948A (en) * 2017-11-13 2018-02-02 中钢集团天澄环保科技股份有限公司 A kind of catalytic cracking flue gas dust-removal and desulfurizing reclaims sodium sulfite technique

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