CN114870600A - Device and method for efficient ammonia decarburization - Google Patents
Device and method for efficient ammonia decarburization Download PDFInfo
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- CN114870600A CN114870600A CN202210553356.2A CN202210553356A CN114870600A CN 114870600 A CN114870600 A CN 114870600A CN 202210553356 A CN202210553356 A CN 202210553356A CN 114870600 A CN114870600 A CN 114870600A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
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- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B01D2257/504—Carbon dioxide
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Abstract
The device comprises a pressurizing device, a decarbonizing device and an ammonia removing device, wherein the decarbonizing device is provided with a bubbling unit and a solution circulating spraying unit. The carbon dioxide-containing process gas is fed into a decarbonization device through a pressurization device, and CO is removed from the gas by using ammonia as an absorbent 2 And producing ammonium bicarbonate. And (3) dispersing the pressurized flue gas into an ammonium salt solution through a bubbling unit, and converting ammonium carbonate and ammonium carbamate into ammonium bicarbonate. And then the contact area and the retention time of the ammonium salt solution and the flue gas are increased through the upper spraying device, the conversion reaction is strengthened, and the decarburization efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a device and a method for efficient ammonia decarburization.
Background
At present, the waste gas treatment efficiency of each industrial enterprise is generalLow content of CO or discharged into the atmosphere after desulfurization and dust removal treatment 2 The greenhouse gases are discharged into the environment, and a series of environmental problems such as global warming acceleration and the like are caused. Therefore, an active and effective CO is sought 2 Gas treatment methods are one of the problems to be solved in many countries. Ammonium bicarbonate is a quick-acting nitrogen fertilizer with the molecular formula of NH 4 HCO 3 Is easy to dissolve in water and decompose, and is suitable for various crops and various soils, and carbon dioxide is one of raw materials for preparing ammonium bicarbonate, so that CO in industrial enterprise waste gas is utilized 2 The gas is processed into ammonium bicarbonate, which not only can solve CO 2 The problem of direct discharge into the atmosphere and the ability to produce ammonium bicarbonate fertilizers have been the subject of research and development by those skilled in the art.
Patent application CN201010125082.4 discloses a method for utilizing CO 2 Production method for synthesizing ammonium bicarbonate fertilizer by using exhaust gas, and CO obtained after dust removal and desulfurization by using tail gas 2 The waste gas and the strong ammonia water adopt the process of generating ammonium bicarbonate by countercurrent contact, the ammonia gas in the previous working procedure is recovered by an ammonia recovery tower, and the residual tail gas is directly discharged to the atmosphere. The process comprises the steps of mixing concentrated ammonia water with CO 2 The process adopts a mode that a plurality of main decarbonizing towers are connected in parallel and then connected with an auxiliary tower in series, so that the investment cost is high.
Patent application CN200880122376.2 discloses a multistage CO for treating flue gas streams 2 Removal systems and methods use an absorber vessel to contact a flue gas stream with an ionic solution containing ammonia at cryogenic conditions of 0-20 ℃, while the solution of the first absorption stage has a higher temperature and a lower ammonia to carbon ratio than the solution of the third absorption stage. Ammonia slip can be reduced by controlling the ionic solution at a lower temperature and controlling the ionic solution at a lower temperature in the third stage, but the patent does not mention how to reduce the temperature with high efficiency and energy saving.
Patent application CN00123369.6 discloses an ammonia absorption method for CO in flue gas 2 A method for acid gas. a, dedusting and cooling flue gas; b, pressurizing and then delivering gas to the gas cabinet; c, injecting acid gas absorbent solution at the top of the carbonization tower, pumping and cooling flue gas, pressurizing the flue gas, feeding the flue gas from the bottom of the tower, and using a gas distributorFully reacting and controlling the temperature; d, discharging liquid from the bottom when the solid-liquid ratio in the carbonization tower is 1: 1-3, and simultaneously discharging flue gas from the top; e, standing and aging the solid-liquid mixture; cooling again to make the crystal slightly larger, and separating; f, separating to obtain a solid compound nitrogen fertilizer and a liquid centrifugal supernatant; g, pressurizing the flue gas in the step d, feeding the flue gas into a cleaning tower from the bottom, and removing CO 2 、NH 3 Then discharging into the atmosphere; adding clear water from the upper part of the cleaning tower and then discharging from the bottom; h, mixing the liquid discharged from the cleaning tower with the liquid separated from the centrifuge for later use; i, recovering the collected liquid to increase the ammonia concentration, and supplementing other components to form the acid gas absorbent for later use. The scheme aims at reducing CO emission 2 The aim is to produce composite nitrogen fertilizer, which can not produce ammonium bicarbonate alone, and CO in flue gas can not be removed efficiently without considering the characteristic that the ammonia absorbs carbon dioxide alone 2 。
Disclosure of Invention
In order to solve the above purpose, the invention is realized by the following technical scheme:
a high-efficiency ammonia decarburization device comprises a supercharging device, a decarburization device and an ammonia removal device, wherein the decarburization device at least comprises a bubbling unit and a circulating spraying unit; the bubbling unit is connected with the pressurizing device through a pipeline.
Generally, the absorption circulating liquid containing ammonium salt is used for removing carbon dioxide in gas to realize the decarbonization of the ammonia process for producing ammonium bicarbonate, and the main principle is as follows:
at 10-30 deg.C and one atmosphere of pressure, CO 2 The main products of the reaction with ammonia are ammonium carbamate and ammonium carbonate, which is a reversible reaction.
The general chemical reaction formula:
in the actual course of the reaction, there are many intermediate reactions, presumably as follows:
ammonium carbamate hydrolysis:
NH 3 and H 2 And (3) O reaction:
and (3) reacting ammonium bicarbonate produced by hydrolysis with ammonia water to generate ammonium carbonate:
ammonium carbonate absorbs carbon dioxide to form ammonium bicarbonate:
as can be seen from the above reactions, carbon dioxide and ammonia have various complicated chemical reactions, and most of them are reversible reactions, and the solution components are complicated and mainly include ammonium carbonate, ammonium bicarbonate, ammonium carbamate, ammonia or their combination.
The decarbonization equipment is generally controlled in a subarea mode and comprises an ammonium bicarbonate generation area and a decarbonization absorption area, wherein the ammonium bicarbonate generation area is at least provided with a grade-1 gas distributor and a grade-1 liquid distributor, and the gas distributor and the liquid distributor can be selected from a bubbling type, a liquid distribution spraying type or a combination thereof. The decarbonization absorption zone is provided with at least 2 stages of gas-liquid contact, the gas-liquid contact mode is preferably spray type or packing type, and equipment/parts only allowing gas to pass through are arranged between each zone and each stage. The flue gas entering the decarburization equipment is sequentially contacted with the ammonium bicarbonate generation liquid and the decarburization absorption liquid, so that the cooperative control of ammonium bicarbonate generation, ammonium bicarbonate crystallization, carbon dioxide absorption and ammonia escape is realized. In the high-efficiency ammonia decarburization device and method, ammonia is not added to the ammonium salt solution in order to ensure the production of ammonium bicarbonate, and the ammonia is mainly added in the decarburization absorption area, such as a first stage decarburization absorption area and a second stage decarburization absorption area. Preferably, ammonia is fed to the first and second decarburization absorption zones and the ammonia addition to the second decarburization absorption zone is 80 to 50 wt%, preferably 75 to 55 wt%, more preferably 72 to 57 wt%, most preferably 60 to 65 wt% of the total ammonia addition, and no ammonia is added to the final decarburization absorption zone and the ammonium bicarbonate formation zone.
The supercharging device is preferably a booster fan.
The decarbonization apparatus also comprises a cooling device to remove heat from the decarbonization system.
The cooling device is preferably a coil cooling system which is arranged below the liquid level.
The circulating spraying unit is at least one stage. When a multistage spray absorption unit is provided, the respective spray units may be combined in one tower or in a plurality of towers.
The cooling device also comprises a heat exchanger for cooling the circulating spray liquid, and the heat of the system is removed through the cooling spray circulating liquid.
The ammonia removal equipment is connected with the decarburization equipment.
The bubbling unit comprises a distributor, and the distributor is provided with uniformly distributed air holes.
The air hole spacing is 100-500mm, and the air hole diameter is 10-100 mm.
The air hole is 500-5000mm below the liquid level.
The circulating spraying unit comprises a circulating pump, a circulating pipeline and at least 1 layer of circulating liquid distributor.
Containing CO 2 The process gas is fed into a decarbonization device through a pressurizing device, and ammonia is used as an absorbent to remove CO from the gas 2 Producing ammonium bicarbonate, wherein the decarbonization equipment comprises a bubbling unit and a circulating spraying unit,
and blowing the process gas into the ammonium salt solution through a bubbling unit, and reacting to obtain the ammonium bicarbonate.
The circulating spraying unit increases the contact area and the retention time of the ammonium salt solution and the flue gas through the circulating liquid distributor, strengthens the conversion reaction and improves the decarburization efficiency.
The ammonium salt comprises ammonium carbonate, ammonium bicarbonate, ammonium carbamate, or a combination thereof.
The ammonium salt solution is free of or low in ammonia.
And the ammonium salt solution is sent to an ammonium bicarbonate treatment device to produce solid ammonium bicarbonate.
The temperature of the ammonium salt solution is controlled by a cooling device to be 10-30 ℃, preferably 15-25 ℃.
The process gas pressure is controlled by the pressure increasing means in the range of 6 to 60kPa, preferably 10 to 50 kPa.
The gas pressure in the decarburization facility was kept at normal pressure (except for the system resistance of the decarburization facility).
The invention also relates to the following embodiments:
1. a high-efficiency ammonia decarburization device is characterized by comprising a pressurization device, a decarburization device and an ammonia removal device, wherein the decarburization device at least comprises a bubbling unit and a circulating spraying unit; the bubbling unit is connected with the pressurizing device through a pipeline.
2. The apparatus according to embodiment 1, wherein the pressure boosting device is preferably a booster fan.
3. The apparatus according to embodiment 1, wherein the decarburization facility further includes a cooling unit for removing heat from the decarburization system.
4. The apparatus of embodiment 3, wherein the cooling means is preferably a coil cooling system, the coil cooling system being disposed below the liquid level.
5. The apparatus according to embodiment 1, wherein the circulating spray unit has at least one stage.
6. The apparatus according to embodiment 5, wherein the circulating spray unit has a plurality of stages, and the multistage spray absorption units may be combined in one column or in a plurality of columns.
7. The apparatus of embodiment 3 or 4, wherein the cooling means further comprises a heat exchanger for cooling the circulating spray liquid, and system heat is removed by cooling the circulating spray liquid.
8. The plant according to embodiment 1, characterized in that the ammonia removal unit is connected to the decarbonization unit.
9. The apparatus according to embodiment 1, wherein the bubbling unit comprises a distributor having uniformly distributed air holes.
10. The device according to embodiment 9, wherein the pitch of the air holes is 100-500mm and the diameter of the air holes is 10-100 mm.
11. The device according to embodiment 9, wherein the vent is located 500-5000mm below the liquid level.
12. The device according to embodiment 2, wherein the circulating spraying unit comprises a circulating pump, a circulating pipeline and at least 1 layer of circulating liquid distributor.
13. The method for high-efficiency ammonia decarburization is characterized by comprising CO 2 The process gas is fed into a decarbonization device through a pressurizing device, and ammonia is used as an absorbent to remove CO from the gas 2 Producing ammonium bicarbonate, wherein the decarbonization equipment comprises a bubbling unit and a circulating spraying unit,
and blowing the process gas into the ammonium salt solution through a bubbling unit, and reacting to obtain the ammonium bicarbonate.
The circulating spraying unit increases the contact area and the retention time of the ammonium salt solution and the flue gas through the circulating liquid distributor, strengthens the conversion reaction and improves the decarburization efficiency.
14. The method of embodiment 13, wherein the ammonium salt comprises one or a combination of ammonium carbonate, ammonium bicarbonate, and ammonium carbamate.
15. The method of embodiment 13, wherein the ammonium salt solution has no or little ammonia added.
16. The method of embodiment 13, wherein the ammonium salt solution produces solid ammonium bicarbonate by a post-treatment system.
17. The process according to embodiment 13, characterized in that the temperature of the ammonium salt solution is controlled by a cooling device to be 10 ℃ to 30 ℃, preferably 15 ℃ to 25 ℃.
18. The process according to embodiment 13, characterized in that the process gas pressure is controlled by the pressure-increasing means to 6 to 60kPa, preferably 10 to 50 kPa.
19. The process according to embodiment 13, wherein the gas pressure in the decarburization facility is maintained at atmospheric pressure.
20. The method of embodiment 13, wherein the process gas is ammonia desulfurized.
Drawings
FIG. 1 is a schematic diagram of the technical scheme in example 1.
FIG. 2 is a schematic diagram of the technical scheme in comparative example 1.
Comparative example 1 with respect to example 1, no bubbling unit was provided and the process gas was introduced into the decarbonation apparatus at a point above the liquid level.
The process gas comprises a process gas 1, a booster fan 2, a decarbonization device 3, an ammonium bicarbonate treatment device 4, an ammonium bicarbonate generation area 5, an ammonium bicarbonate generation area circulating pump 6, a first-stage decarbonization absorption area 7, a first-stage decarbonization absorption area circulating pump 8, a second-stage decarbonization absorption area 9, a second-stage decarbonization absorption area circulating pump 10, a decarbonized gas 11, an ammonium bicarbonate discharge pump 12, a bubbling unit 13, a circulating spray unit 14, a heat exchanger 15, a coil pipe 16 and ammonia 17
Detailed Description
The gas to be treated in the process of the invention is any suitable gas, preferably an ammonia desulphurised process gas.
In the high-efficiency ammonia decarburization device and method, the bubbling unit and the uniformly distributed air holes arranged on the bubbling unit are adopted to ensure that the entering process gas is more uniformly distributed in the ammonium salt solution, so that the reaction of the process gas and the ammonium salt solution is further promoted, and the decarburization efficiency is effectively improved.
The bubbling unit adopted in the high-efficiency ammonia decarburization device and method of the invention is of any structure capable of bubbling process gas, for example, the bubbling unit comprises a distributor, the distributor comprises a bubbling pipe array uniformly laid in the ammonium salt solution and consists of a plurality of rows of gas distribution pipes and a plurality of rows of bubbling pipes vertically intersected with the gas distribution pipes and communicated at the intersection points, and a plurality of aeration holes are uniformly distributed on the bubbling pipes; and the gas transmission pipeline is connected with the multiple rows of gas distribution pipes. The distributor is provided with uniformly distributed air holes, the air hole spacing is preferably 100-500mm, more preferably 150-400mm, even more preferably 200-350mm, and most preferably 230-300mm, and the air hole diameter is 10-100mm, preferably 15-80mm, more preferably 30-70mm, and most preferably 40-60 mm.
CO in gas is decarbonized by the high-efficiency ammonia method 2 The content is obviously reduced. In particular CO in the process gas before decarbonation 2 The content is 6-50 v%; preferably 8-40% v; more preferably 10-30 v%.
CO in the gas after the high efficiency ammonia decarburization of the present invention 2 The content is 0-6 v%; preferably 0-5 v%; preferably 0-3 v%.
The method for high-efficiency ammonia decarburization protected by the invention is preferably carried out in the device for high-efficiency ammonia decarburization defined by the invention.
The invention has the advantages of decarburization efficiency, ammonia escape and ammonium bicarbonate fertilizer (ammonium bicarbonate for short) production. The decarburisation efficiency achieved with the apparatus and method according to the invention is at least 60%, preferably at least 70%, more preferably at least 80%. The ammonia escape after decarburization is smaller (between 800-. The ammonia slip after passing through the ammonia slip control system is less than or equal to 20ppm, preferably 15ppm, and more preferably 10 ppm. The ammonium bicarbonate solids content of the ammonium bicarbonate formation zone is greater than 2 wt%, preferably greater than 5 wt%, more preferably greater than 8 wt%. Meanwhile, the decarbonization device can partially absorb the pollutant SO 2 Lower SO is obtained 2 Concentration of less than 10mg/Nm 3 Preferably less than 5mg/Nm 3 More preferably less than 2mg/Nm 3 。
Decarburization efficiency (Q1 w1-Q2 w2)/(Q1 w1) 100%
Q1 is dry flue gas flow rate of decarbonization device in standard inlet state, m 3 /h；
w1 is the volume fraction of carbon dioxide in the inlet flue gas of the decarbonization device measured by an instrument;
q2 is dry flue gas flow rate of decarbonization device in standard state 3 /h；
w1 is the volume fraction of carbon dioxide in the flue gas at the outlet of the decarbonization device measured by an instrument.
SO in gas in the invention 2 The content test method is HJ 629-;
CO 2 the content test method is a non-dispersive infrared absorption method for measuring the carbon dioxide in the exhaust gas of the HJ 870-;
NH 3 the content test method is a nano reagent spectrophotometry method for measuring the HJ 533-2009 ambient air and the waste gas ammonia.
The following example 1 and comparative example 1 are provided to further illustrate the advantageous technical and economic effects of the high-efficiency ammonia decarburization method and apparatus of the present invention.
Examples
Example 1
Containing CO 2 After the front-end desulfurization, the process gas 1 is pressurized to 20kPa by the booster fan 2 and is connected to the bubbling unit 13 of the decarburization facility 3 (specifically, the decarburization absorption tower) through a flue gas duct. Decarbonization equipment 3 includes ammonium bicarbonate formation district 5, first order decarbonization absorbing zone 7 and second level decarbonization absorbing zone 9 along the flue gas flow direction in proper order, wherein ammonium bicarbonate formation district 5 is equipped with bubbling unit 13 and circulation and sprays unit 14, first order decarbonization absorbing zone and second level decarbonization absorbing zone all adopt the groove type distributor and pack the mode and realize gas-liquid contact, be equipped with the liquid trap that only allows gaseous passing through between ammonium bicarbonate formation district 5, first order decarbonization absorbing zone 7 and the second level decarbonization absorbing zone 9.
The ammonium salt solution at the bottom of the ammonium carbonate generation zone 5 comprises ammonium carbonate, ammonium bicarbonate, ammonium carbamate.
The process gas 1 is bubbled through a bubbling unit 13 into a solution of ammonium salts, the ammonium carbonate and ammonium carbamate of which are associated with the CO in the process gas 2 The reaction produces ammonium bicarbonate.
The ammonium salt solution is conveyed to a circulating spraying unit 14 through a circulating pump 6 in the ammonium carbonate generation area, and ammonium carbonate and ammonium carbamate and CO in the process gas after the ammonium carbonate solution and the ammonium carbamate are contacted with the process gas 2 The reaction is continued to produce ammonium bicarbonate.
The bubbling unit comprises a distributor, and the distributor is provided with uniformly distributed air holes. The air hole spacing is 200mm, and the air hole diameter is 50 mm. The air hole is positioned 1700mm below the liquid level.
The system cooling equipment comprises a coil 16 below the liquid level of the ammonium bicarbonate generation area and a heat exchanger 15 on a pipeline of the circulating spraying unit, and the ammonium salt solution is cooled by an external cold source to ensure that the temperature of the ammonium salt solution is 22 ℃.
In order to ensure the production of ammonium bicarbonate, ammonia is not added to the ammonium salt solution, and the ammonia 17 is mainly added in the first stage decarburization absorption section 7 and the second stage decarburization absorption section 9.
The ammonium salt solution is delivered to an ammonium bicarbonate treatment device 4 through an ammonium bicarbonate discharge pump 12 to produce solid ammonium bicarbonate.
The gas pressure in the decarburization device 3 is kept at normal pressure, and the internal pressure is kept at 3kPa only to overcome the system pressure drop.
The process gas 1 parameters are given in the following table:
| serial number | Item | Numerical value |
| 1 | Gas amount, Nm 3 /h | 78710 |
| 2 | Temperature, C | 25 |
| 3 | SO 2 Content, mg/Nm 3 | 35 |
| 4 | CO 2 Content, v% | 13.5 |
| 5 | NH 3 Content in |
3 |
The main parameters of the post-decarbonation gas 11 treated by the decarbonation device 3 are given in the following table:
comparative example 1
Containing CO 2 After the front-end desulfurization, the process gas 1 is pressurized to 3kPa by a booster fan 2 and is connected to the upper part of the liquid level of an ammonium bicarbonate generation zone 5 of a decarburization device 3 (specifically, a decarburization absorption tower) through a flue gas pipeline. Decarbonization equipment 3 includes ammonium bicarbonate formation district 5, first order decarbonization absorption zone 7 and second grade decarbonization absorption zone 9 along the flue gas flow direction in proper order, and wherein ammonium bicarbonate formation district 5 is equipped with the circulation and sprays unit 14, and first order decarbonization absorption zone and second grade decarbonization absorption zone all adopt slot type distributor and filler mode to realize gas-liquid contact, are equipped with the liquid trap that only allows gas to pass through between ammonium bicarbonate formation district 5, first order decarbonization absorption zone 7 and the second grade decarbonization absorption zone 9.
The ammonium salt solution at the bottom of the ammonium carbonate generation zone 5 comprises ammonium carbonate, ammonium bicarbonate, ammonium carbamate.
The ammonium salt solution is conveyed to a circulating spraying unit 14 through a circulating pump 6 in the ammonium carbonate generation area, and ammonium carbonate and ammonium carbamate and CO in the process gas after the ammonium carbonate solution and the ammonium carbamate are contacted with the process gas 2 The reaction produces ammonium bicarbonate.
The system cooling equipment comprises a coil 16 below the liquid level of the ammonium bicarbonate generation area and a heat exchanger 15 on a pipeline of the circulating spraying unit, and the ammonium salt solution is cooled by an external cold source to ensure that the temperature of the ammonium salt solution is 22 ℃.
In order to ensure the production of ammonium bicarbonate, ammonia is not added to the ammonium salt solution, and the ammonia 17 is mainly added in the first stage decarburization absorption section 7 and the second stage decarburization absorption section 9.
The gas pressure in the decarburization device 3 is kept at normal pressure, and the internal pressure is kept at 3kPa only to overcome the system pressure drop.
The process gas 1 parameters are given in the following table:
the main parameters of the post-decarbonation gas 11 treated by the decarbonation device 3 are given in the following table:
| serial number | Item | Numerical value |
| 1 | Gas quantity at outlet of decarburization absorption tower, Nm 3 /h | 77339 |
| 2 | CO at the outlet of the decarburization absorption tower 2 Content, v% | 8.11 |
| 3 | Outlet NH of decarbonizing absorption tower 3 Content in ppm | 1000 |
| 4 | Outlet SO of decarbonizing absorption tower 2 Content, mg/ |
5 |
| 5 | Efficiency of decarburization% | 40 |
| 6 | Amount of ammonium bicarbonate as by-product, t/h | 15.0 |
| 7 | 99.6% of liquid ammonia consumption, t/h | 3.24 |
As can be seen from the comparison between the above examples of the present invention and the comparative examples, the high-efficiency ammonia decarburization conducted by the method and apparatus of the present invention can achieve high-efficiency decarburization while controlling ammonia escape, thereby achieving excellent technical and economic effects.
It is to be understood that the foregoing is only a preferred embodiment of the invention, and that modifications in the teachings of the invention will readily occur to those skilled in the art upon the reading of this disclosure. Therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. A high-efficiency ammonia decarburization device is characterized by comprising a pressurization device, a decarburization device and an ammonia removal device, wherein the decarburization device at least comprises a bubbling unit and a circulating spraying unit; the bubbling unit is connected with the pressurizing device through a pipeline.
2. The apparatus of claim 1, wherein the pressure boosting device is preferably a booster fan.
3. The apparatus of claim 1, wherein the decarbonization apparatus further comprises a cooling device to remove heat from the decarbonization system.
4. The apparatus of claim 3, wherein the cooling means is preferably a coil cooling system, the coil cooling system being disposed below the liquid level.
5. The apparatus of claim 1, wherein the cyclic spray unit has at least one stage.
6. The apparatus as claimed in claim 5, wherein the circulating spray unit has a plurality of stages, and the multistage spray absorption units can be combined in one tower or a plurality of towers.
7. The apparatus of claim 3 or 4, wherein the cooling means further comprises cooling the circulating spray using a heat exchanger to remove system heat by cooling the circulating spray.
8. The apparatus according to claim 1, wherein the ammonia removal means is connected to the decarbonization means.
9. The apparatus of claim 1, wherein the bubbling unit comprises a distributor having uniformly distributed gas holes.
10. The apparatus as claimed in claim 9, wherein the air holes have a pitch of 100-500mm and a diameter of 10-100 mm.
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