CN100518889C - Low-consumption high-quality ammonium sulfate fertilizer recovery wet ammonia process desulfurizing technology - Google Patents

Low-consumption high-quality ammonium sulfate fertilizer recovery wet ammonia process desulfurizing technology Download PDF

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CN100518889C
CN100518889C CNB2006100180300A CN200610018030A CN100518889C CN 100518889 C CN100518889 C CN 100518889C CN B2006100180300 A CNB2006100180300 A CN B2006100180300A CN 200610018030 A CN200610018030 A CN 200610018030A CN 100518889 C CN100518889 C CN 100518889C
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ammonium sulfate
ammonium
ammonia
flue gas
desulfurizing tower
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CNB2006100180300A
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CN101143291A (en
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史选增
邵本良
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史选增
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Abstract

The invention relates to a desulphurization and denitrogenation technology for controlling air pollution in environmental protection field. The invention is designed aiming at the problem of high production cost of reclaiming ammonium sulfate fertilizer and low quality of the reclaimed ammonium sulfate product by using the existing ammonia-fertilizer desulphurization technology, and the problem of that the half dry typed ammonia desulphurization technology can cause a secondary pollution to the environment. The invention provides a wet typed ammonia desulphurization technology of reclaiming ammonium sulfate fertilizer with low energy consumption and high quality. The invention adopts ammonia water as a desulfurizer. The ammonium sulfite, which is made after the gas is fully processed two-grade desulphurization, is processed two-grade oxidation outside the tower. The ammonium sulfite is fully reacted and formed ammonium sulfate, and the produced ammonium sulfate solution is contacted exchanged heat with high temperature gas, which reduces the gas temperature, and at the same time, the ammonium sulfate solution is condensed, and consequently, through which greatly saves the cost of evaporating, drying and making the ammonium sulfate fertilizer, and so the technical proposal of the invention not only can reclaim high quality ammonium sulfate product, but also has low reclaiming cost, and at the same time the purified gas can reach discharge standard without a secondary pollution like waste water etc.

Description

The wet ammonia process desulfurizing technology that a kind of low-consumption high-quality ammonium sulfate fertilizer reclaims

Technical field:

The present invention relates to field of environment protection air contaminant treatment desulfurization removing nitric technology, relate in particular to the wet ammonia process desulfurizing technology that a kind of low-consumption high-quality ammonium sulfate fertilizer reclaims.

Background technology:

Existing similar technology and existence not enough as follows:

1. ammonia-fertile method desulfur technology

Adopt ammoniacal liquor as desulfurizing agent, big cycle volume makes SO in ammonium sulfate and ammonium sulfite solution and the flue gas under the acid condition of circulation fluid PH<6 in the sieve-board type desulfurizing tower 2Reaction removes SO 2Generate accessory substance ammonium sulfate and ammonium sulfite, utilize the method for air aeration that sulfite oxidation is become ammonium sulfate in the desulfurizing tower bottom, after discharging, ammonium sulfate, finishes the removal process of desulfurization and ammonium sulfate product through producing ammonia sulfate crystal packing warehouse-in after filtration, evaporation, centrifugal, the drying.

This method exists following defective:

1) solution is operation under the acid condition of PH<6 in desulfurizing tower, desulfurizing tower main equipment and pipe network system are caused serious corrosion, even by inner anti-corrosion measure, also can only be to delay corrosion, can cause reduce greatly the service life of system, operational reliability reduces greatly;

2) contain SO in the circulation fluid under the acid condition 2When the ammonium sulfite of absorption is arranged, also contain a large amount of ammonium sulfate compositions, and ammonium sulfate is to SO 2Do not have absorbability, therefore cause a large amount of ammonium sulfates to participate in idle loop, cause a large amount of consumption of circulating pump power on the one hand, increase the cost of operation; On the other hand, because the circulation of a large amount of ammonium sulfates contacts with flue gas, the discharged flue gas temperature loss is serious after causing cleaning and desulfurization, exhaust gas temperature low excessively (<50 ℃), the low-temperature flue gas that contains water saturation can cause the heavy corrosion infringement to chimney for a long time, have to take to increase the GGH reheat system at the flue gas after the desulfurization and be warmed up to and enter chimney about 80 ℃ again, the result causes the further increasing of investment and operating cost;

3) this technology is moved under acid condition, desulfurization afterproduct sulfite oxidation becomes ammonium sulfate to realize by aeration in desulfurizing tower, be difficult to reach the abundant catalytic oxidation of air and ammonium sulfite solution, it is very difficult that oxygenation efficiency reaches 80-90%, so contain a large amount of ammonium sulfite compositions that do not have through peroxidating in the ammonium sulfate product that causes the back level to reclaim; Ammonium sulfate product has fertilizer efficiency as the raw material of agrochemical or composite fertilizer; The ammonium sulfite product if be used for the farmland, can occur burning seedling then without any fertilizer efficiency, causes the accident, and consequence is serious; Therefore, the ammonium sulfate product quality of the method recovery is lower;

4) this technical method is the method that adopts conventional evaporation drying to the removal of moisture in the desulfurization afterproduct ammonium sulfate, need to consume a large amount of steam energy, average water evaporation per ton needs 2 tons steam approximately, need 100 yuan steam expense approximately according to existing cost price calculating, cost for the large-sized station boiler long-time running is a huge spending, so the operating cost of this technology extraction accessory substance ammonium sulfate is very high.

2. half dry type ammonia-process desulfurization technique

This method adopts ammoniacal liquor as desulfurizing agent, is diluted to the SO that sprays into behind the desired concn in desulfurizing tower and the flue gas 2Reaction generates ammonium sulfite solution, and part solution recycles, and Xun Huan ammonium sulfite solution does not efflux as by-product solution owing to concentration lower (well below saturation state), thus the sweetening process of finishing.

These class methods exist following defective:

1) accessory substance is unsaturated ammonium sulfite solution, can only abandon, and causes serious waste and discharge of wastewater secondary pollution; If adopt the method for evaporation to reclaim, operating cost is difficult to bear;

2) the part gaseous ammonia very easily overflows with flue, causes the waste gas secondary pollution.

Summary of the invention:

In problem that ammonium sulfate product quality too high at ammonia in the prior art-fertile method desulfur technology reclaim sulfuric acid ammonium production cost and that reclaim is lower and the half dry type ammonia-process desulfurization technique environment is caused secondary pollution problem, the present invention proposes the wet ammonia process desulfurizing technology that a kind of low-consumption high-quality ammonium sulfate fertilizer reclaims, technical flow design is reasonable, the desulfuration efficiency height, can also remove simultaneously the nitrogen of a part, the ammonium sulfate quality that reclaims is pure, does not contain ammonium sulfite (NH 4) 2SO 3Composition, economic worth is considerable, realize environment protection treating " turning waste into wealth ", and this technology does not have secondary pollutions such as " waste gas, waste water, waste residues " in desulfurization.

The present invention adopts following technical scheme to realize:

The wet ammonia process desulfurizing technology that a kind of low-consumption high-quality ammonium sulfate fertilizer reclaims, comprising the following step:

A), in ammoniacal liquor configuration store jar (1), dispose ammoniacal liquor, by the ammoniacal liquor for preparing being sent into desulfurizing tower (7) for ammonia pump (2) and pipe-line system (3);

B), the high-temperature flue gas after the dedusting is sent into carry can concentration tower (4), with the ammonium sulfate contact heat-exchanging of sending here through solution pump (19) by ammonium sulfate flow container (18), enter desulfurizing tower (7) behind the flue gas cool-down and carry out follow-up desulfurization, moisture content in the ammonium sulfate is concentrated to by the high-temperature flue gas evaporation and concentration that carry can concentration tower (4) bottom to the saturation state, sends into cyclone hydraulic separators (20) by high pressure ammonium sulfate pump (6) and carries out liquid-solid separation;

C), flue gas can concentration tower after (4) enter desulfurizing tower (7) from carrying, and carries out desulfurization with ammoniacal liquor, generates ammonium sulfite, be concentrated in the collecting tank of desulfurizing tower (7) bottom; Ammonium sulfite solution in the collecting tank of desulfurizing tower (7) bottom is delivered in the ammonium sulfite storage tank (11) through circulating pump (9);

D), the ammonium sulfite solution in the ammonium sulfite storage tank (11) in solution pump (12) is sent into oxidation tank (14), air blast (13) blasts air in oxidation tank (14), the gas-liquid concurrent-countercurrent fully contacts and carries out stair oxidation and generate ammonium sulfate; Ammonium sulfate and ammonium sulfite mixed liquor that circulating pump (15) extracts oxidation tank (14) bottom spray in the oxidation tank (14) once more, the air of sending into air blast (13) concurrent-countercurrent once more contacts, make ammonium sulfite and the abundant haptoreaction of airborne oxygen in the mixed liquor, generate ammonium sulfate, send into ammonium sulfate flow container (18) through filtrate pump (17) again;

E), through carrying the ammonium sulfate after energy concentration tower (4) concentrates, send into cyclone hydraulic separators (20) by high pressure ammonium sulfate pump (6) and carry out liquid-solid separation, after isolated crystal ammonium sulfate enters centrifugal separator (21) dehydration, send into drier again and carry out drying and be finished ammonium sulphate product.

The wet ammonia process desulfurizing technology that described low-consumption high-quality ammonium sulfate fertilizer reclaims, wherein, described step c), concrete technical process such as following step:

C1), flue gas can concentration tower after (4) enter desulfurizing tower (7) from carrying, contact with the ammoniacal liquor that atomizes at desulfurizing tower (7) entrance earlier and carry out first grade desulfurizing, the SO in the flue gas 2Flow in the collecting tank of desulfurizing tower bottom with the ammonium sulfite of ammoniacal liquor reaction generation and the mixed liquor of excessive ammonia;

C2), after the flue gas after the first grade desulfurizing enters desulfurizing tower (7), the mixed liquor that circulating pump (9) extracts in the collecting tank of desulfurizing tower (7) bottom carries out secondary desulfurization, ammonium sulfite in the mixed liquor and the SO in the flue gas by the spraying layer (10) in the desulfurizing tower (7) to the spray of the flue gas in the desulfurizing tower 2Reaction generates ammonium bisulfite; The excessive ammonia reaction that sprays into first grade desulfurizing behind the bisulfite ammonia inflow collecting tank generates ammonium sulfite.

The wet ammonia process desulfurizing technology that described low-consumption high-quality ammonium sulfate fertilizer reclaims wherein, in the described step e), contains small amount of ammonium sulfate in the water that centrifugal separator is deviate from, and this ammonium sulfate is sent in the ammonium sulfate flow container (18).

Adopt the present invention will reach following good effect:

Present technique technology desulfuration efficiency height can remove part nitrogen simultaneously; SO in waste gas 2In the time of qualified discharge, the escape of ammonia can be lower than below 0.5%, and without any discharge of wastewater, the accessory substance of generation is highly purified crystal ammonium sulfate product, does not contain ammonium sulfite (NH4) 2SO 3Composition, have considerable economic value, realize environment protection treating " turning waste into wealth ", this technology does not have secondary pollutions such as " waste gas, waste water, waste residues " in desulfurization; It is extremely low that ammonium sulfate product reclaims the integrated operation cost, guarantees when realizing desulfurization, and ammonium sulfate reclaims and produces considerable " positive benefit ", meets recycling economy and sustainable development that country advocates.

Description of drawings:

Figure 1 shows that the system and the schematic flow sheet of the wet ammonia process desulfurizing technology that adopts low-consumption high-quality ammonium sulfate fertilizer recovery of the present invention.

Number in the figure:

1-ammoniacal liquor preparation system; 2-for ammonia pump; 3-pipe-line system;

4-carrying can concentration tower; 5-chimney; 6-high pressure ammonium sulfate pump;

7-desulfurizing tower; 8-ammoniacal liquor; 9-circulating pump;

10-spraying layer; 11-ammonium sulfite storage tank; 12-solution pump;

13-air blast; 14-oxidation tank; 15-circulating pump;

16-filter; 17-filtrate pump; 18-ammonium sulfate flow container;

19-solution pump; 20-cyclone hydraulic separators; 21-centrifugal separator;

22-drier; 23-elevator.

The specific embodiment:

Easily environment is caused secondary pollution at desulfur technology of the prior art, or reclaim sulfuric acid ammonium fertilizer cost is too high and shortcoming that quality is not high, the present invention proposes the wet ammonia process desulfurizing technology that a kind of low-consumption high-quality ammonium sulfate fertilizer reclaims, the technical program with ammoniacal liquor as the desulfurization removing nitric absorbent, the system and the schematic flow sheet of the wet ammonia process desulfurizing technology technology of the present invention that provides below with reference to Fig. 1, technological process of the present invention comprises the following steps:

A), in ammoniacal liquor configuration store jar (1), dispose ammoniacal liquor, by the ammoniacal liquor for preparing being sent into desulfurizing tower (7) for ammonia pump (2) and pipe-line system (3);

B), carry can concentration tower (4) with sending into from the bottom after the high temperature fume dust removal, the ammonium sulfate of being sent here through solution pump (19) by ammonium sulfate flow container (18) sprays into from the top atomizing that carry can concentration tower (4), ammonium sulfate and high-temperature flue gas contact heat-exchanging, enter desulfurizing tower (7) behind the flue gas cool-down and carry out follow-up desulfurization, moisture content in the ammonium sulfate by the high-temperature flue gas evaporation and concentration to the saturation state carrying and can concentrating concentration tower (4) bottom, send into cyclone hydraulic separators (20) by high pressure ammonium sulfate pump (6) and carry out liquid-solid separation;

C), flue gas discharge carry can concentration tower (4) after, contact with the atomizing ammoniacal liquor that sprays at desulfurizing tower (7) entrance earlier and carry out first grade desulfurizing, the SO in the flue gas 2The mixed liquor that generates ammonium sulfite and excessive ammonia with the ammoniacal liquor reaction flows in the collecting tank of desulfurizing tower bottom; After flue gas after the first grade desulfurizing enters desulfurizing tower (7), circulating pump (9) extract mixed liquor in the collecting tank of desulfurizing tower (7) bottom by the interior spraying layer (10) of desulfurizing tower (7) to not taking off most SO in the flue gas in the desulfurizing tower 2The secondary desulfurization is carried out in reaction; Ammonium sulfite in the mixed liquor and the SO in the flue gas 2The excessive ammonia reaction that sprays into first grade desulfurizing behind the bisulfite ammonia inflow collecting tank that reaction generates generates ammonium sulfite; Ammonium sulfite solution in the collecting tank of desulfurizing tower (7) bottom is delivered in the ammonium sulfite storage tank (11) through circulating pump (9);

D), the ammonium sulfite solution in the ammonium sulfite storage tank (11) in solution pump (12) is sent into oxidation tank (14), air blast (13) blasts air in oxidation tank (14), concurrent-countercurrent fully contacts and carries out stair oxidation and generate ammonium sulfate; Ammonium sulfate and ammonium sulfite mixed liquor that circulating pump (15) extracts oxidation tank (14) bottom spray in the oxidation tank (14) once more, the air of sending into air blast (13) concurrent-countercurrent once more contacts, make ammonium sulfite and the abundant haptoreaction of airborne oxygen in the mixed liquor, generate ammonium sulfate, ammonium sulfate is sent into filter (16) elimination dust impurity through circulating pump (15), sends into ammonium sulfate flow container (18) through filtrate pump (17) again;

E), through carrying the ammonium sulfate of energy concentration tower system (4), send into cyclone hydraulic separators (20) by high pressure ammonium sulfate pump (6) and carry out liquid-solid separation, after isolated crystal ammonium sulfate enters centrifugal separator (21) dehydration, send into drier (22) again and carry out drying and be finished ammonium sulphate product, can pack warehouse-in below; The small amount of ammonium sulfate mother liquor that centrifugal separator (21) is deviate from is sent in the ammonium sulfate flow container (18); Solution pump (19) is sent into the ammonium sulfate in the ammonium sulfate flow container (18) and is carried and can concentrate by concentration tower (4).

Shown in the system and schematic flow sheet of the wet ammonia process desulfurizing technology that reclaims as Fig. 1 low-consumption high-quality ammonium sulfate fertilizer of the present invention, the system that wet ammonia process desulfurizing technology technology of the present invention is adopted comprises five parts:

1, for ammonia device:

Comprise be used for liquefied ammonia, gas ammonia or high concentration ammoniacal liquor is configured to preserve standby ammoniacal liquor configuration store jar (1) after the required concentration, for ammonia pump (2) and the ammoniacal liquor that is used for configuring concentration be sent to the pipe-line system (3) of desulfurizing tower.

2, carry energy concentration tower heat exchange enrichment facility:

After high-temperature flue gas process electricity or sack cleaner dedusting, can concentration tower (4) cooling enter the next stage desulfurizer through carrying again; The mother liquor ammonium sulfate that reaches back level centrifuge discharge after the oxidation is driven into through high-pressure solution pump (19) carries energy concentration tower (4), atomizing back and high-temperature flue gas contact heat-exchanging in carrying energy concentration tower (4), enter desulfurizing tower (7) behind the flue gas cool-down, simultaneously the most of moisture in the ammonium sulfate is taken away by smoke evaporative, and ammonium sulfate is carried the dense ammonium sulfate that is driven into back grade by high pressure ammonium sulfate pump (6) after the saturation state and separated out device.

3, desulfurizer:

Desulfurizing tower (7) is the main device of desulfurization, is divided into two-stage SO 2Absorb: first in system's smoke inlet section, and Venturi tube structure contains SO 2Flue gas contact with the certain density ammoniacal liquor that sprays into of atomizing and carries out one-level absorption, SO at the corresponding levels 2Absorptivity reaches more than 85%, and the ammonium sulfite solution of generation enters into the bottom collecting tank of desulfurizing tower (7); Second level SO 2The circulating pump (9) of absorption by desulfurizing tower (7) ammonium sulfite solution in the tower bottom collecting tank is extracted, by interior the spraying layer of desulfurizing tower (7) (10) flue gas is sprayed, do not take off most SO in ammonium sulfite and the flue gas 2Fully contact absorbs once more, SO at the corresponding levels 2Absorptivity reach more than 90%; Ammonium sulfite (NH 4) 2SO 3With SO 2Generate bisulfite ammonium salt solution (NH behind the absorption reaction 3HSO 3) be faintly acid, absorb the excessive ammonia that sprays into first order venturi and carry out neutralization reaction in the desulfurizing tower bottom, the generation ammonium sulfite solution circulates repeatedly successively, reaches efficiently to remove SO 2Purpose, the ammonium sulfite (NH that generates after the desulfurization 4) SO 3Solution is driven into supporting ammonium sulfurous storage tank (11) buffer memory of desulfurizing tower, is driven into the oxidation and the device for filtering impurities of back level through solution pump (12); In desulfurizing tower (7), SO 2Total absorptivity reaches (actual total absorptivity can be regulated device and ammonia concn, consumption according to concrete discharge standard) more than 95%; The ammoniacal liquor that the first order venturi section that may take out of in the flue gas sprays into washes down by three layers of spraying layer (10) of desulfurizing tower, guarantees that the ammonia composition that may contain from the flue gas after being purified that chimney (5) is discharged reduces as far as possible, makes it up to standard.

4, oxidation and device for filtering impurities:

For guaranteeing to be recovered to the high-purity ammonia sulfate crystal, the present invention carries out the outer secondary oxidation of tower to ammonium sulfurous liquid, and the oxidation air consumption is higher than the several times of theoretical value, guarantees oxygenation efficiency greater than more than 99%, and the ammonium sulfate content that guarantees to reclaim is more than 99%.It is low and cause and contain a large amount of ammonium sulfites in the ammonium sulfate crystallization body of recovery fundamentally to have solved aeration oxygenation efficiency in other towers, causes the fatal problem that product can not be up to standard that reclaims.

The pre-oxidation of A one-level: atm number, low consumption of the liquid, the gas-liquid contact is quite abundant, Forced Mixing, concurrent-countercurrent contact.

B secondary cyclic oxidation: atm number, big liquid measure, the contact of Forced Mixing gas-liquid, quite abundant, the concurrent-countercurrent contact, air is evenly distributed in oxidation tank.

Ammonium sulfate after the C oxidation contains low amounts of dust and other impurity that does not eliminate in the flue gas, through vacuum filter (16), dust impurity is leached, and filtrate is squeezed into ammonium sulfate flow container (18) through filtrate pump (17), and squeezing into carrying of prime by solution pump (19) can concentration tower (4).

5, the ammonium sulfate finished product is separated out device

Through carrying can concentration tower (4) ammonium sulfate of concentrating state that reached capacity, be driven in the cyclone hydraulic separators (20) (being the stiff device) by high-pressure solution pump (6) and carry out liquid-solid separation, isolated crystal ammonium sulfate is through centrifugal separator (21) dehydration of bottom, the ammonia sulfate crystal finished product of moisture content<5% is sent to drier (22), further dry back moisture content is less than 1%, satisfy the requirement of ammonium sulfate GB535-1995, be transported to the ammonium sulfate feed bin with elevator (23), be packaged into the bag warehouse-in, finish the production removal process of byproduct; The ammonium sulfate liquor that spinning liquid seperator (20) and centrifugal separator (21) are selected is sent to ammonium sulfate flow container (18), carries out circulating and evaporating and carries densely, moves in circles successively.

Whole system does not have discharge of wastewater, and a small amount of ash content that vacuum filter (16) leaches is regularly delivered to coal cinder yard, and the flue gas after being purified qualified discharge does not have that " three wastes " wait secondary pollution.

Adopt technical scheme of the present invention, will reach following technique effect:

1, present technique technology desulfuration efficiency reaches more than 95%, and nitric efficiency reaches more than 30%; At waste gas SO2In the time of qualified discharge, the escape of ammonia can be lower than below 0.5%, and without any discharge of wastewater, the accessory substance of generation is highly purified crystal ammonium sulfate product (satisfying ammonium sulfate GB535-1995), does not contain ammonium sulfite (NH4) 2SO 3Composition, have considerable economic worth, can realize environment protection treating " become useless into Precious ", this technology does not have secondary pollutions such as " waste gas, waste water, waste residues " in desulfurization.

2, this technology ammonium sulfate product recovery steam consumption is very low, is that about 10% of ammonia-fertile method (only exist The a small amount of steam of rear level drying nest consumption), power consumption reduces by 40%, and the integrated operation cost is extremely low, guarantees realizing In the time of desulfurization, ammonium sulfate reclaim to produce considerable " positive benefit ", meets recycling economy that country advocates and can Sustainable development.

The technology of the present invention technology is at Henan Province's coal gasification the second stage of the project (Yima, Henan Province gasification plant) 2 * 135t/h The flue gas desulfurization of CFBB and byproduct of ammonium sulfate recovery system are implemented design objective: be The system desulfuration efficiency reaches more than 90%, 16000 tons in year recovery accessory substance ammonium sulfate, and product satisfies ammonium sulfate The requirement of GB535-1995, system produces without any waste water, and the escape of ammonia is well below national standard, The boundary is without any the peculiar smell of ammonia.

To sum up, present technique technology has remedied existing desulfur technology and easily environment has been caused secondary pollution, or reclaims Ammonium sulfate fertilizer high cost and the not high deficiency of quality provide a kind of energy consumption the low and ammonium sulfate that reclaims The high wet ammonia process desulfurizing technology technology of fertile quality.

Claims (3)

1, a kind of wet ammonia process desulfurizing technology of low-consumption high-quality ammonium sulfate fertilizer recovery is characterized in that comprising the following steps:
A), in ammoniacal liquor configuration store jar (1), dispose ammoniacal liquor, by the ammoniacal liquor for preparing being sent into desulfurizing tower (7) for ammonia pump (2) and pipe-line system (3);
B), the high-temperature flue gas after the dedusting is sent into carry can concentration tower (4), with the ammonium sulfate contact heat-exchanging of sending here through solution pump (19) by ammonium sulfate flow container (18), enter desulfurizing tower (7) behind the flue gas cool-down and carry out follow-up desulfurization, moisture content in the ammonium sulfate is concentrated to by the high-temperature flue gas evaporation and concentration that carry can concentration tower (4) bottom to the saturation state, sends into cyclone hydraulic separators (20) by high pressure ammonium sulfate pump (6) and carries out liquid-solid separation;
C), flue gas can concentration tower after (4) enter desulfurizing tower (7) from carrying, and carries out desulfurization with ammoniacal liquor, generates ammonium sulfite, be concentrated in the collecting tank of desulfurizing tower (7) bottom; Ammonium sulfite solution in the collecting tank of desulfurizing tower (7) bottom is delivered in the ammonium sulfite storage tank (11) through circulating pump (9);
D), the ammonium sulfite solution in the ammonium sulfite storage tank (11) in solution pump (12) is sent into oxidation tank (14), air blast (13) blasts air in oxidation tank (14), the gas-liquid concurrent-countercurrent fully contacts and carries out stair oxidation and generate ammonium sulfate; Ammonium sulfate and ammonium sulfite mixed liquor that circulating pump (15) extracts oxidation tank (14) bottom spray in the oxidation tank (14) once more, the air of sending into air blast (13) concurrent-countercurrent once more contacts, make ammonium sulfite and the abundant haptoreaction of airborne oxygen in the mixed liquor, generate ammonium sulfate, send into ammonium sulfate flow container (18) through filtrate pump (17) again;
E), through carrying the ammonium sulfate after energy concentration tower (4) concentrates, send into cyclone hydraulic separators (20) by high pressure ammonium sulfate pump (6) and carry out liquid-solid separation, after isolated crystal ammonium sulfate enters centrifugal separator (21) dehydration, send into drier again and carry out drying and be finished ammonium sulphate product.
2, the wet ammonia process desulfurizing technology of low-consumption high-quality ammonium sulfate fertilizer recovery as claimed in claim 1 is characterized in that: described step c), and concrete technical process such as following step:
C1), flue gas can concentration tower after (4) enter desulfurizing tower (7) from carrying, contact with the ammoniacal liquor that atomizes at desulfurizing tower (7) entrance earlier and carry out first grade desulfurizing, the SO in the flue gas 2Flow in the collecting tank of desulfurizing tower bottom with the ammonium sulfite of ammoniacal liquor reaction generation and the mixed liquor of excessive ammonia;
C2), after the flue gas after the first grade desulfurizing enters desulfurizing tower (7), the mixed liquor that circulating pump (9) extracts in the collecting tank of desulfurizing tower (7) bottom carries out secondary desulfurization, ammonium sulfite in the mixed liquor and the SO in the flue gas by the spraying layer (10) in the desulfurizing tower (7) to the spray of the flue gas in the desulfurizing tower 2Reaction generates ammonium bisulfite; The excessive ammonia reaction that sprays into first grade desulfurizing behind the bisulfite ammonia inflow collecting tank generates ammonium sulfite.
3, the wet ammonia process desulfurizing technology of low-consumption high-quality ammonium sulfate fertilizer recovery as claimed in claim 1, it is characterized in that: in the described step e), contain small amount of ammonium sulfate in the water that centrifugal separator is deviate from, this ammonium sulfate is sent in the ammonium sulfate flow container (18).
CNB2006100180300A 2006-09-13 2006-09-13 Low-consumption high-quality ammonium sulfate fertilizer recovery wet ammonia process desulfurizing technology CN100518889C (en)

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CN101757843B (en) * 2008-10-17 2012-10-03 山东福荫造纸环保科技有限公司 Improved process for performing ammonium sulfite pulping by using sulfur-containing flue gas absorber
CN101474530B (en) * 2008-10-28 2011-06-22 无锡高达环境科技有限公司 Wet-type ammonia process three-circulation desulphurization technique suitable for sintered flue gas
CN101422688B (en) * 2008-11-07 2011-06-29 浙江大学 Process of flue-gas desulfurization by ammonia-ammonium sulphate wet-method and ammonium sulphate recovery using induced crystallization
CN101837235B (en) * 2009-03-19 2012-08-29 北京九州美电科技有限公司 Low-consumption high-efficiency boiler flue gas desulfurization process
CN101643369B (en) * 2009-08-28 2012-04-18 洛阳市天誉环保工程有限公司 Process and device for producing (NH4)2SO4 fertilizer by using ammonium sulfite solution
CN101791511B (en) * 2010-03-30 2012-01-11 山东大学 Process and system for ammonia spraying flue gas desulfurization and sulfur dioxide recovery
CN101955193B (en) * 2010-09-16 2012-06-20 上海电力学院 Method for preparing hydrogen and fertilizer ammonium sulfate by desulfurizing coal-fired waste gas
CN102641657A (en) * 2011-02-18 2012-08-22 上海离岛电子新材料有限公司 Method for strictly controlling discharge of ammonia-containing tail gas in the ammonium salt production and improving ammonium salt output using the tail gas
CN103553078B (en) * 2013-11-22 2015-07-22 云南云铝涌鑫铝业有限公司 Technology for preparing ammonium sulfate by high-efficiency ammonia desulphurization and crystallization
CN104998530A (en) * 2015-03-31 2015-10-28 武汉宇青环保科技有限公司 Sulfuric acid tail gas desulphurization device and method
CN106422693A (en) * 2016-11-10 2017-02-22 昆明新光能源环保科技有限公司 Method and device of removing SO2 in flue gas by acid-ammonia method
CN108325341A (en) * 2018-02-08 2018-07-27 广州凯燃环保工程技术有限公司 A kind of Novel flue gas desulfurizer
CN108408748A (en) * 2018-05-15 2018-08-17 陆泳凯 A kind of method of magnesium method flue gas desulphurization product production magnesium hydroxide

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