CN110065954B - Ammonia gas generating device - Google Patents
Ammonia gas generating device Download PDFInfo
- Publication number
- CN110065954B CN110065954B CN201910430620.1A CN201910430620A CN110065954B CN 110065954 B CN110065954 B CN 110065954B CN 201910430620 A CN201910430620 A CN 201910430620A CN 110065954 B CN110065954 B CN 110065954B
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- China
- Prior art keywords
- shell
- inlet pipe
- ammonia
- generating device
- gas
- Prior art date
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 239000007789 gas Substances 0.000 claims abstract description 57
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 35
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003546 flue gas Substances 0.000 claims abstract description 31
- 238000005507 spraying Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000011550 stock solution Substances 0.000 claims abstract description 7
- 239000012263 liquid product Substances 0.000 claims abstract description 6
- 239000000047 product Substances 0.000 claims abstract description 6
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 10
- 239000004202 carbamide Substances 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 12
- 239000001099 ammonium carbonate Substances 0.000 description 12
- 230000009471 action Effects 0.000 description 11
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 10
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 235000012501 ammonium carbonate Nutrition 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Classifications
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/026—Preparation of ammonia from inorganic compounds
-
- 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
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
Abstract
The invention relates to the technical field of ammonia preparation, and particularly provides an ammonia generating device, which aims to solve the problems that high-temperature flue gas and atomized urea solution are insufficiently mixed and ammonia yield is low in an ammonia generating device of an existing flue gas denitration system. For this purpose, the ammonia gas generating device comprises a shell with a cylindrical inner cavity, wherein a liquid inlet pipe, an air inlet pipe, a liquid outlet and an air outlet are arranged on the shell; the liquid inlet pipe is arranged at the middle position of the top of the shell and extends downwards, and the liquid inlet pipe is provided with a spraying component for spraying ammonia-making stock solution into the shell; an air inlet pipe for conveying high-temperature flue gas into the shell is connected to the side part of the shell, and the inner wall of the air inlet pipe is tangent to the inner wall of the shell; the liquid outlet and the gas outlet are arranged at the bottom of the shell and are respectively used for discharging liquid products and gas products of the ammonia production reaction. The high-temperature gas enters the shell to form a rotary air flow, so that the mixing of the atomized liquid and the high-temperature gas is promoted, and the yield of ammonia gas is improved.
Description
Technical Field
The invention relates to the technical field of ammonia gas preparation, and particularly provides an ammonia gas generating device.
Background
The flue gas discharged by thermal power plants, smelting plants, industrial boilers and the like contains a large amount of NOx, and is a main pollutant for generating acid rain in the atmosphere. At present, the most mature flue gas denitration technology is selective catalytic reduction denitration (SCR), and the principle is that NOx in flue gas is reduced into N by utilizing ammonia under the action of a catalyst 2 And H 2 O. In general, in a flue gas denitration system, strong ammonia water is added to an ammonia gas generating device and heated to generate ammonia gas, and the generated ammonia gas is mixed with flue gas so as to reduce NOx in the flue gas. However, the transportation of concentrated ammonia as a raw material for the preparation of ammonia gas is inconvenient and presents a great safety risk.
In view of the above, through the improved flue gas denitration system, urea particles and water are mixed to form urea solution, the urea solution is sprayed into a reaction cavity of an ammonia gas generating device through a spraying device, meanwhile, high-temperature flue gas is introduced into the reaction cavity of the ammonia gas generating device, the atomized urea solution is mixed with the high-temperature flue gas, the heat of the high-temperature flue gas enables urea in the urea solution to decompose to generate ammonia, the mixed gas of the ammonia and the flue gas is discharged and is introduced into a denitration reaction device after dehumidification, and the ammonia and NOx in the flue gas are subjected to reduction reaction under the action of a catalyst to eliminate NOx in the flue gas. However, the high-temperature flue gas is usually directly introduced into the ammonia generating device from the bottom of the ammonia generating device, the air outlet is arranged at the top of the ammonia generating device, the high-temperature flue gas directly flows upwards after entering the shell and finally flows out of the air outlet, the flue gas is insufficiently mixed with the atomized urea solution, and the ammonia yield is low.
Accordingly, there is a need in the art for a new solution to the above-mentioned problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problems that high-temperature flue gas and atomized urea solution are insufficiently mixed and the ammonia yield is low in an ammonia gas generating device of the existing flue gas denitration system, the invention provides an ammonia gas generating device which comprises a shell with a cylindrical inner cavity, wherein a liquid inlet pipe, an air inlet pipe, a liquid outlet and an air outlet are arranged on the shell; the liquid inlet pipe is arranged at the middle position of the top of the shell, a spraying member is arranged at the part of the liquid inlet pipe positioned in the shell, and the spraying member is used for spraying ammonia production stock solution into the shell; the air inlet pipe is used for conveying high-temperature flue gas into the shell and is connected to the side part of the shell in the following mode: the inner wall of the air inlet pipe is tangent to the inner wall of the shell; the liquid outlet and the air outlet are both arranged at the bottom of the shell and are respectively used for discharging liquid products and gas products of the ammonia production reaction.
In the preferred technical scheme of the ammonia gas generating device, the axis of the air inlet pipe is perpendicular to the axis of the shell.
In a preferred embodiment of the ammonia gas generating device, the inner diameter of the air inlet pipe is smaller than the radius of the inner cavity of the housing.
In the preferred technical scheme of the ammonia gas generating device, the axis of the air inlet pipe and the axis of the liquid inlet pipe are also mutually perpendicular.
In the preferred technical solution of the ammonia gas generating device, the air inlet pipe is disposed at a position close to the top of the housing.
In a preferred embodiment of the ammonia gas generating device, the air intake pipe is disposed near the top of the housing and has its outlet end inclined downward.
In the preferred technical scheme of the ammonia gas generating device, a spiral flow guiding member extending from top to bottom is further arranged on the inner wall of the shell.
In a preferred embodiment of the ammonia gas generating device, an upper end of the spiral flow guiding member is connected to an outlet end of the air intake pipe.
In a preferred embodiment of the ammonia gas generating device, the spiral flow guide member includes a spiral flow guide plate extending from an inner wall of the housing toward an axis of the housing in a width direction, and a pitch of the spiral flow guide plate gradually decreases from top to bottom.
In the preferred technical scheme of the ammonia gas generating device, the included angle between the spiral guide plate and the axis of the shell is in the range of 70-90 degrees.
It can be understood by those skilled in the art that in the technical scheme of the invention, the ammonia gas generating device comprises a shell with a cylindrical inner cavity, wherein a liquid inlet pipe, an air inlet pipe, a liquid outlet and an air outlet are arranged on the shell, the liquid inlet pipe is arranged at the middle position of the top of the shell and extends downwards, a spraying member is arranged at the part of the liquid inlet pipe in the shell, and the spraying member is used for spraying ammonia-making stock solution into the shell; the air inlet pipe is used for conveying high-temperature flue gas into the shell and is connected to the side part of the shell in the following way: the inner wall of the air inlet pipe is tangent to the inner wall of the shell; the liquid outlet and the gas outlet are arranged at the bottom of the shell and are respectively used for discharging liquid products and gas products of the ammonia production reaction. It should be noted that the inner wall of the air inlet pipe is tangent to the inner wall of the housing, which means that the air inlet pipe penetrates from the side of the housing, and the distance between the axis of the air inlet pipe and the axis of the housing is exactly equal to half of the difference between the inner diameter of the housing (i.e., the diameter of the inner cavity of the housing) and the inner diameter of the air inlet pipe (i.e., the diameter of the cylindrical surface formed by the inner wall of the air inlet pipe). Through the arrangement, the high-temperature flue gas in the inner cavity of the shell is introduced into the air inlet pipe to form air flow, and after entering the inner cavity of the shell from the outlet end of the air inlet pipe, the flow direction is changed continuously along the cylindrical surface of the shell, so that the rotary downward rotary air flow is formed. The ammonia-making stock solution (such as ammonium bicarbonate solution) is sprayed to the middle part of the inner cavity of the shell (namely, the area close to the axis of the shell) through a spraying component on the liquid inlet pipe to form atomized liquid. The atomized liquid subsides downwards in the middle of the inner cavity under the action of gravity, the rotating airflow formed by the high-temperature gas spirally downwards flows around the inner cavity, and the flow speed is larger than the gas flow speed in the middle of the inner cavity, so that the air pressure in and near the rotating airflow is smaller than the air pressure in the middle of the inner cavity, the atomized liquid is sucked into the rotating airflow in the process of sedimentation under the action of air pressure difference, turbulence is formed in the rotating airflow, the atomized liquid is mixed with the high-temperature gas, the atomized liquid fully contacted with the high-temperature gas absorbs the heat of the high-temperature gas, so that the ammonium carbonate is decomposed to generate ammonia, the utilization rate of the heat of the high-temperature gas and the decomposition rate of reactants (ammonium carbonate) in the atomized liquid are improved, and the yield of the ammonia is further improved.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of an ammonia gas generating device according to an embodiment of the present invention;
FIG. 2 is a front view of an ammonia gas generating device in accordance with one embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a semi-sectional view of an ammonia gas generating device in accordance with one embodiment of the present invention;
fig. 5 is an enlarged view of a portion B in fig. 4.
List of reference numerals:
11. an upper housing; 12. a lower housing; 13. a cone section; 21. a first flange; 22. a second flange; 23. a third flange; 24. a fourth flange; 31. a liquid inlet pipe; 32. an air inlet pipe; 33. an air outlet; 34. a liquid outlet; 4. an atomizing nozzle; 5. spiral deflector.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. For example, although the housing of the ammonia gas generating device of the present invention includes two upper and lower housings having different diameters, those skilled in the art can adjust the housing as required to suit specific applications, for example, the housing of the ammonia gas generating device of the present invention may include two upper and lower housings having the same diameters, or may be a housing having a cylindrical inner cavity. Obviously, the adjusted technical scheme still falls into the protection scope of the invention.
It should be noted that, in the description of the present invention, terms such as "left", "right", "upper", "lower", "inner", "outer", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better illustration of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some embodiments, methods, means, elements and circuits well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
Referring to fig. 1 to 4, fig. 1 is a schematic structural view of an ammonia generating device according to an embodiment of the present invention; FIG. 2 is a front view of an ammonia gas generating device in accordance with one embodiment of the present invention; FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2; fig. 4 is a semi-sectional view of an ammonia gas generating device in accordance with an embodiment of the present invention.
As shown in fig. 1 to 4 and according to the orientation shown in fig. 2, in a specific embodiment, the housing of the ammonia gas generating device includes an upper housing 11 and a lower housing 12 which are provided up and down and have cylindrical inner cavities with different inner diameters, the lower end of the upper housing 11 is provided with a cone section 13 for transitional connection, the lower end of the cone section 13 is provided with a first flange 21, the upper end of the lower housing 2 is provided with a second flange 22, the lower part of the upper housing 11 is welded and fixed with the small opening end of the cone section 13, the large opening end of the cone section 13 is welded and fixed with the first flange 21, the upper end of the lower housing 12 is welded and fixed with the second flange 22, and the first flange 21 and the second flange 22 are butted together and fixed by bolts (not shown in the figure). The middle position of the top of the upper cylinder 11 is provided with a liquid inlet pipe 31, the liquid inlet pipe 31 passes through the middle part of the third flange 23, the top of the upper cylinder 11 is fixedly welded with a fourth flange 24, and the third flange 23 and the fourth flange 24 are fixedly connected through bolts (not shown in the figure), so that the liquid inlet pipe 31 coincides with the axes of the upper shell 11 and the lower shell 12. The part of the liquid inlet pipe 31 located in the lower shell 12 is provided with spraying components for spraying the ammonium bicarbonate solution (namely ammonia production stock solution) into the shell, such as 5 atomizing nozzles 4 which are alternately distributed on two sides of the liquid inlet pipe 31 along the axial direction of the liquid inlet pipe 31. An air inlet pipe 32 for delivering high-temperature flue gas into the housing is provided at a position near the top end of the side portion of the upper housing 11, and the inner wall of the air inlet pipe 32 is tangential to the inner wall of the upper housing 11, and the axis of the air inlet pipe 32 is perpendicular to the axis of the upper housing 11. That is, the distance of the axis of the air intake pipe 32 from the axis of the upper case 11 is exactly equal to half the difference between the inner diameter of the upper case 11 (i.e., the diameter of the inner cavity of the upper case 11) and the inner diameter of the air intake pipe 32 (the diameter of the cylindrical surface formed by the inner wall of the air intake pipe 32), and the axis of the air intake pipe 32 is perpendicular to the axis of the upper case 11. Preferably, the inner diameter of the air inlet pipe 32 is smaller than the radius of the inner cavity of the upper housing 11. The bottom of the lower shell 12 is provided with an air outlet 33 arranged along the radial direction of the lower shell and a liquid outlet 34 arranged downwards, the air outlet 33 is used for discharging liquid products generated in the ammonia production reaction in the shell, and the air outlet 33 is used for discharging gas products generated in the ammonia production reaction in the shell.
The ammonium bicarbonate solution is fed through the feed pipe 31 and sprayed out through the atomizer head 4 to form an atomized liquid, and the atomized liquid is sprayed to the middle part of the upper housing 11 (i.e., the area in the upper housing 11 near the axis thereof) and is settled down under the action of gravity. High-temperature flue gas discharged from a thermal power plant, a smelting plant, an industrial boiler and the like is introduced into the upper shell 11 through the air inlet pipe 32. In the orientation shown in fig. 3, the high-temperature flue gas forms a straight-line air flow in the air inlet pipe 32, the straight-line air flow flows into the upper shell 11 from right to left along the air inlet pipe 32, after flowing out from the outlet end of the air inlet pipe 32, the straight-line air flow is forced to change the flow direction under the action of the cylindrical curved surface of the upper shell 11 to be attached to the inner wall of the upper shell 11 to flow in a counterclockwise rotation, the air outlet 33 is arranged at the bottom of the lower shell 12, and due to the difference of internal air pressure and the action of gravity, the air flow formed by the high-temperature flue gas simultaneously flows downwards in the upper shell 11, so that a downward flowing spiral air flow is formed, the spiral air flow is attached to the inner wall of the upper shell 11 to flow downwards in a rotating manner, and after entering the lower shell 12, most of the air flow continues to be attached to the inner wall of the lower shell 12 to flow downwards in a spiral manner. The gas flow velocity in the middle of the housing (i.e., the region within the housing near its axis) is less and the velocity of the swirling gas flow is greater, such that the gas pressure within and near the swirling gas flow is less than the gas pressure in the middle of the housing. The existence of the air pressure difference enables the atomized liquid to rapidly diffuse into the rotating air flow in the shell, and turbulent flow exists in the rotating air flow, so that the atomized liquid and the high-temperature gas are uniformly mixed. The atomized liquid absorbs heat in the high-temperature flue gas, wherein the ammonium bicarbonate is heated and decomposed to generate ammonia, water and carbon dioxide, and as the heat is consumed, the generated water vapor and residual atomized liquid are condensed into liquid drops to fall and gather at the bottom of the lower shell 12, and finally the liquid drops are discharged from the liquid outlet 34, and the mixed gas of the ammonia, the carbon dioxide and the flue gas is discharged from the gas outlet 33 at the bottom of the lower shell 12.
The inner wall of the gas inlet pipe 32 is tangential to the inner wall of the upper housing 11 and the axis thereof is perpendicular to the axis of the upper housing, so that the high temperature gas can flow along a horizontal tangential line of the upper housing 11 after flowing into the upper housing 11 from the outlet end of the gas inlet pipe 32, thereby being forced to change the flow direction and rotate under the action of the cylindrical curved surface of the upper housing 11. And, this arrangement can reduce the resistance of the inner wall of the upper housing 11 to the air flow, thereby reducing the kinetic energy loss of the air flow in the process of forming the rotating air flow and ensuring the rotating speed of the air flow. The inner diameter of the air inlet pipe 32 is smaller than the radius of the inner cavity of the upper shell 11, so that high-temperature air can enter the upper shell 11 from one side of the axis of the upper shell 11 along the air inlet pipe 32, and the entering high-temperature air can participate in the formation of rotary airflow under the action of the inner wall of the curved surface. The feed liquor pipe 31 sets up the intermediate position at the casing top, and the axis of feed liquor pipe 31 is perpendicular with the axis of intake pipe 32, can make the atomized liquid evenly spray to the casing middle part to make atomized liquid evenly diffuse to in the rotatory air current all around, improved atomized liquid and high temperature gas mixing degree, promoted the decomposition of ammonium bicarbonate in the ammonia preparation stoste, improved the output of ammonia. As the ammonium bicarbonate solution is used as the ammonia preparation solution, the pyrolysis temperature of the ammonium bicarbonate is lower, and when the ammonium bicarbonate solution is mixed with high-temperature flue gas with the same temperature, the decomposition rate is high compared with that of urea solution, and the yield of ammonia can be further improved.
It will be appreciated by those skilled in the art that the housing of the ammonia generating device comprises two upper and lower housings of different diameters is merely illustrative, and that the skilled person will be able to adapt it to specific applications as required, e.g. the housing of the ammonia generating device may comprise two upper and lower housings of the same diameter, or may be a housing with a cylindrical inner cavity. In addition, the number of atomizer heads 4 is 5 is only an exemplary illustration, and one skilled in the art can adapt it as needed to suit a particular application, e.g., the number of atomizer heads 4 can be 4, 6, 7 or more, etc., and the nozzle aperture of atomizer heads 4 can be adjusted as needed, e.g., the nozzle aperture of atomizer heads 4 can be 0.1mm, 0.3mm, 0.5mm, or other suitable dimensions, etc. Furthermore, the arrangement of the inlet tube 31 coincident with the axis of the upper and lower housings 11, 12 is only a preferred embodiment, and one skilled in the art can adjust it as needed to suit a particular application, e.g. the inlet tube 31 may be arranged at a top intermediate position of the housing and at an angle of 5 °, 10 ° with the housing axis, etc. Further, the location of the inlet pipe 32 near the top of the side of the upper housing 11 is only an exemplary illustration, and those skilled in the art can adapt it as desired to suit a specific application, for example, the inlet pipe 32 may be located near the bottom of the side of the upper housing 11 and near the top of the side of the lower housing 12, as long as it is capable of allowing high temperature gas to spiral downward toward the outlet 33.
In an alternative embodiment, the difference from the above-described embodiment is that: the axis of the air intake pipe 32 is not perpendicular to the axis of the upper housing 11, and the air intake pipe 32 is disposed with the outlet end inclined downward. By such arrangement, the high-temperature flue gas forms a straight-line air flow in the air inlet pipe 32 to flow toward the upper housing 11, the straight-line air flow flows out from the outlet end of the air inlet pipe 32 and is attached to the inner wall of the upper housing 11, the speed direction of the straight-line air flow is inclined downward, and the speed of the straight-line air flow can be decomposed into a horizontal component speed in the horizontal plane and a vertical component speed in the vertical direction. The horizontal component velocity, along a tangential direction of the upper housing 11 thereat, causes the air flow to rotationally flow against the inner wall of the upper housing 11, and the vertical component velocity causes the air flow to flow downwardly, thereby promoting the formation of a spiral air flow that rotationally descends.
With reference to fig. 5 and with continued reference to fig. 4, fig. 5 is an enlarged view of portion B of fig. 4. Preferably, a spiral flow guiding member is arranged in the upper shell 11, and the spiral flow guiding member is attached to the inner wall of the upper shell 11 and extends from top to bottom. Specifically, the spiral guide member is a spiral guide plate 5. The high-temperature gas enters the upper shell 11 from the gas inlet 32 to form a spiral gas flow in the upper shell, and the gas flow is further shaped after passing through the spiral guide plate 5 in the downward flowing process of the spiral gas flow, so that the spiral downward flowing of the gas flow is promoted, the spiral flowing stroke of the gas flow is prolonged, the spiral gas reaches the lower shell 12 and can keep the spiral downward flowing for a long time, and the mixing of the atomized liquid and the high-temperature gas is promoted.
Preferably, the upper end of the spiral baffle 5 is connected to the outlet end of the air inlet pipe 32. When the high-temperature gas flows into the upper housing 11 from the outlet end of the gas inlet pipe 32, the high-temperature gas promotes the gas to flow downwards spirally under the combined action of the inner wall of the housing 1 and the spiral flow guiding member, promotes the rapid formation of the rotating gas flow, and guides the spiral gas flow to flow downwards to the lower housing 12 spirally from top to bottom, and promotes the atomized liquid and the high-temperature gas to be fully mixed in the lower housing 12. Preferably, the pitch of the helical baffle decreases progressively from top to bottom. In the process that the airflow formed by the high-temperature gas flows through the spiral guide plate 5, the airflow flowing channel is narrowed by the width, and the air inflow is kept unchanged, so that the speed of the airflow is accelerated, the flow speed of the rotating airflow is improved, the air pressure difference is increased, the diffusion speed of atomized liquid is improved, the atomized liquid and the high-temperature gas are promoted to be quickly and uniformly mixed, the contact time is prolonged, and the yield of ammonia is improved.
Preferably, as shown in fig. 5, in a direction in which the spiral guide plate 5 extends from the inner wall of the upper housing 11 toward the axis of the upper housing 11 (i.e., a width direction of the spiral guide plate 5), an angle α between the spiral guide plate 5 and the axis of the upper housing 11 is in a range of 70 ° to 90 °. Preferably, the angle α is 70 °. Through such setting, can make high temperature gas flow at the spiral in-process that flows downwards remove a small amount of distance to feed liquor pipe 31 to make a large amount of atomized liquid directly spray in the rotatory air current, utilize the turbulent flow in the rotatory air current to mix atomized liquid and high temperature gas, and part atomized liquid passes through the atmospheric pressure difference diffusion to rotatory air current in, make atomized liquid and high temperature gas mix more evenly. Preferably, a plurality of micropores are formed on the spiral guide plate 5, and part of gas can pass through the micropores on the spiral guide plate 5 in the process that the high-temperature gas flows downwards along the spiral guide plate 5, so that the mixed atomized liquid in the rotating gas flow is further scattered to form smaller atomized liquid drops, the atomized liquid and the high-temperature gas are more uniformly mixed, the contact area of the atomized liquid and the high-temperature gas is increased, the decomposition of ammonium bicarbonate in the ammonium bicarbonate solution is further promoted, and the yield of ammonia gas is increased.
It will be appreciated by those skilled in the art that an angle α of 70 ° between the axis of the spiral baffle 5 and the upper housing 11 is only one specific embodiment, and those skilled in the art can adjust the angle α as required, for example, the angle α may be 75 °, 80 °, 83 ° and so on. In addition, the helical baffle 5 is a preferred embodiment, in which the pitch of the helical baffle 5 decreases gradually from top to bottom, and those skilled in the art can set the helical baffle 5 to have a uniform pitch as required; and the connection of the upper end of the spiral guide plate 5 to the outlet end of the air inlet pipe 32 is only a preferred embodiment, and those skilled in the art can arrange the spiral guide plate 5 such that the upper end thereof is not connected to the outlet end of the air inlet pipe 32 as required. Furthermore, the helical flow guide member is merely one specific embodiment, and one skilled in the art can adapt it as desired to suit a particular application, such as providing the helical flow guide member as a helical tube, a helical groove, etc.
As can be seen from the above description, in the ammonia gas generating device according to the present invention, the ammonia gas generating device includes a housing having a cylindrical inner cavity, a liquid inlet pipe, an air inlet pipe, a liquid outlet and an air outlet are disposed on the housing, the liquid inlet is disposed at a top middle position of the housing and extends vertically downward, a spraying member is disposed at a portion of the liquid inlet pipe located in the housing, the spraying member is used for spraying ammonia-making stock solution into the housing, the air inlet pipe is connected to a side portion of the housing, an inner wall of the air inlet pipe is tangent to an inner wall of the housing, and the liquid outlet and the air outlet are both disposed at a bottom of the housing and are respectively used for discharging liquid products and gaseous products of the ammonia-making reaction. The inner wall of the air inlet pipe is tangent with the inner wall of the shell, so that high-temperature gas can enter the inner cavity of the shell from the outlet end of the air inlet pipe, and then the flowing direction is changed continuously along the cylindrical surface of the shell, so that rotating air flow is formed, air pressure difference is formed between the rotating air flow and an area where atomized liquid sprayed into the middle of the shell is located, the atomized liquid is promoted to diffuse into the air flow, the atomized liquid and the high-temperature gas are promoted to be mixed under the turbulent flow action in the air flow, and the yield of ammonia gas is improved.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (7)
1. The ammonia gas generating device is characterized by comprising a shell with a cylindrical inner cavity, wherein a liquid inlet pipe, an air inlet pipe, a liquid outlet and an air outlet are arranged on the shell;
the liquid inlet pipe is arranged at the middle position of the top of the shell and extends downwards, a spraying member is arranged at the part of the liquid inlet pipe positioned in the shell, and the spraying member is used for spraying ammonia-making stock solution into the shell;
the air inlet pipe is used for conveying high-temperature flue gas into the shell and is connected to the side part of the shell in the following mode: the inner wall of the air inlet pipe is tangent to the inner wall of the shell;
the liquid outlet and the air outlet are arranged at the bottom of the shell and are respectively used for discharging liquid products and gas products of the ammonia production reaction;
the inner diameter of the air inlet pipe is smaller than the radius of the inner cavity of the shell.
2. An ammonia gas generating device as defined in claim 1, wherein the axis of the inlet pipe and the axis of the inlet pipe are also perpendicular to each other.
3. An ammonia generating device as defined in claim 2, wherein the inlet pipe is disposed near the top of the housing.
4. An ammonia gas generating device as defined in claim 1, wherein the inlet pipe is provided at a position near the top of the housing and has its outlet end inclined downward.
5. An ammonia gas generating device as defined in any one of claims 1 to 4, wherein a spiral flow guiding member extending from top to bottom is further provided on an inner wall of the housing; the upper end of the spiral flow guiding component is connected with the outlet end of the air inlet pipe.
6. An ammonia gas generating device as defined in claim 5, wherein the helical flow guide member comprises a helical flow guide plate extending in a width direction from an inner wall of the housing toward an axis of the housing, a pitch of the helical flow guide plate gradually decreasing from top to bottom.
7. An ammonia gas generating device as defined in claim 6, wherein the helical baffle is angled in the range of 70-90 degrees from the axis of the housing.
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