CN212283511U - Wet flue gas deacidifying device - Google Patents
Wet flue gas deacidifying device Download PDFInfo
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- CN212283511U CN212283511U CN201922493043.9U CN201922493043U CN212283511U CN 212283511 U CN212283511 U CN 212283511U CN 201922493043 U CN201922493043 U CN 201922493043U CN 212283511 U CN212283511 U CN 212283511U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 239000003546 flue gas Substances 0.000 title claims abstract description 110
- 239000007788 liquid Substances 0.000 claims abstract description 144
- 230000007246 mechanism Effects 0.000 claims abstract description 134
- 238000005507 spraying Methods 0.000 claims abstract description 83
- 239000007789 gas Substances 0.000 claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 239000000779 smoke Substances 0.000 claims abstract description 20
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000007921 spray Substances 0.000 claims description 27
- 238000012856 packing Methods 0.000 claims description 23
- 239000000945 filler Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 7
- 238000011001 backwashing Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 36
- 239000002253 acid Substances 0.000 abstract description 33
- 230000008569 process Effects 0.000 abstract description 20
- 230000007613 environmental effect Effects 0.000 abstract description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 18
- 239000003814 drug Substances 0.000 description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000013461 design Methods 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 9
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 9
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 229940079593 drug Drugs 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model provides a wet flue gas deacidification device, which comprises a deacidification tower, a liquid supply mechanism, a spraying mechanism, a gas detection mechanism and a control mechanism; the deacidification tower is characterized in that a smoke exhaust channel extends from bottom to top and is arranged in the deacidification tower in a penetrating mode, the spraying mechanism is located in the smoke exhaust channel and is used for spraying liquid containing deacidification liquid, the liquid supply mechanism is used for supplying the spraying liquid to the spraying mechanism and can adjust the concentration of the deacidification liquid, the gas detection mechanism is located in the smoke exhaust channel, the horizontal position of the gas detection mechanism is higher than the horizontal position of the spraying mechanism, and the liquid supply mechanism, the spraying mechanism and the gas detection mechanism are all controlled by the control mechanism. Above-mentioned flue gas wet process deacidification device deals with the fluctuation of the flue gas that the operating mode fluctuation of front end equipment brought through self control, according to the concentration adjustment equipment running state of export flue gas to make the acid gas concentration of export flue gas up to standard, more environmental protection.
Description
Technical Field
The utility model relates to a flue gas treatment technical field especially relates to flue gas wet process deacidification device.
Background
Large and medium-sized waste incineration power plants (daily throughputs exceeding 50 tons) usually adopt dry and semi-dry deacidification processes based on calcium, but when the plants are moved to small-sized waste treatment equipment (daily throughputs less than or equal to 50 tons), the following problems occur. Firstly, the total amount of smoke generated by small-sized garbage treatment equipment is small, the space size and the pipeline size of the corresponding smoke treatment equipment are limited, calcium oxide or calcium hydroxide is adopted by a dry method and a semi-dry method, calcium-based agents are easy to scale in the equipment and the pipeline, the cleaning and the maintenance are difficult, and the service life of the equipment is shortened. Secondly, the deacidification efficiency of the dry method and the semi-dry method is lower than that of the deacidification efficiency of the wet method, and the variable working conditions of small garbage treatment equipment are difficult to deal with.
At present, the flue gas treatment at the tail end of small-sized garbage treatment equipment is still in a rough treatment and management state, the commonly used process is simple water spraying or medicament spraying, the systematic consideration on the process is less, and the flue gas concentration cannot be timely adjusted according to the actual process conditions, such as the flue gas concentration, so that the environmental pollution is caused.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing a flue gas wet process deacidification device and method to solve the technical problem that current flue gas wet process deacidification device can't in time adjust according to technology actual conditions.
The utility model provides a wet flue gas deacidification device, which comprises a deacidification tower, a liquid supply mechanism, a spraying mechanism, a gas detection mechanism and a control mechanism;
the deacidification tower is characterized in that a smoke exhaust channel extends from bottom to top and is arranged in the deacidification tower in a penetrating mode, the spraying mechanism is located in the smoke exhaust channel and is used for spraying liquid containing deacidification liquid, the liquid supply mechanism is used for supplying the spraying liquid to the spraying mechanism and can adjust the concentration of the deacidification liquid, the gas detection mechanism is located in the smoke exhaust channel, the horizontal position of the gas detection mechanism is higher than the horizontal position of the spraying mechanism, and the liquid supply mechanism, the spraying mechanism and the gas detection mechanism are all controlled by the control mechanism.
Further, the liquid supply mechanism comprises a spraying pipeline and a medicine adding pipeline; the dosing pipeline is connected with the bottom of the tower and is used for adjusting the concentration of the circulating liquid in the deacidification tower; the spraying pipeline is connected with the bottom of the tower and is used for sucking the circulating liquid and supplying the circulating liquid to the spraying mechanism.
Furthermore, a flue gas inlet, a rotational flow plate, a packing layer, a demister and a flue gas outlet are sequentially arranged in the deacidification tower from bottom to top; the spraying mechanism is positioned between the packing layer and the demister;
the gas detection mechanism is arranged between the smoke outlet and the demister.
Further, still be equipped with liquid level control mechanism at the bottom of the tower, liquid level control mechanism includes moisturizing pipeline and overflow valve, moisturizing pipeline with the overflow valve respectively with the bottom of the tower intercommunication.
Furthermore, a circulation box communicated with the tower bottom is arranged outside the deacidification tower, and a mesh sieve plate is arranged at the communication position of the circulation box and the tower bottom;
the dosing pipeline, the spraying pipeline and the water supplementing pipeline are communicated with the tower bottom through the circulating box.
Further, a pH detection controller and a liquid level meter are arranged in the tower bottom or the circulating box;
the spraying pipeline and/or the spraying mechanism is/are provided with a flowmeter;
and the feedback end of the pH detection controller, the feedback end of the liquid level meter and the feedback end of the flow meter are connected with the control mechanism.
Furthermore, the dosing pipeline and the water replenishing pipeline share a communicating pipe which is communicated with the circulating box, and the communicating pipe is communicated with one of the dosing pipeline and the water replenishing pipeline through a three-way valve.
Furthermore, the packing layers and the spraying mechanisms are both multiple, and the packing layers and the spraying mechanisms are alternately distributed at intervals along the height direction; the distance between two adjacent packing layers is 1-1.5 m, and the thickness of the packing layer is 15-30 cm; the spraying pipeline comprises a plurality of spraying branch pipes correspondingly connected with the spraying mechanism.
Further, the filler layer is a pall filler layer, and the specific surface area of the pall filler layer is 200m2/m3～220m2/m3。
Further, the demister comprises a first-stage demister and a second-stage demister, wherein the first-stage demister and the second-stage demister are sequentially distributed from the bottom of the tower to the top of the tower and are used for removing large-particle liquid drops and small-particle liquid drops;
the deacidification tower is also provided with a back washing mechanism for cleaning the first-stage demister and the second-stage demister.
The utility model discloses flue gas wet process deacidification device, gaseous detection mechanism detect smoke exhaust passage's acid gas concentration, thereby control mechanism adjusts the flow regulation that supplies liquid mechanism on the one hand according to the testing result and sprays the volume that sprays of mechanism, and on the other hand adjusts the concentration of taking off the acidizing fluid to the dual function descends acid gas concentration in the export flue gas, reaches emission standard, more environmental protection. Above-mentioned flue gas wet process deacidification device deals with the fluctuation of the flue gas that the operating mode fluctuation of front end equipment brought through self control, according to the concentration adjustment equipment running state of export flue gas to make the acid gas concentration of export flue gas up to standard, more environmental protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wet flue gas deacidification apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart of a wet flue gas deacidification method according to an embodiment of the present invention.
The reference numbers illustrate:
100. a deacidification tower; 200. a spray pipe; 300. a circulation box;
110. a flue gas inlet; 120. a swirl plate; 130. a spraying mechanism; 140. a filler layer; 150. a demister; 160. the tower top; 170. a flue gas outlet; 180. a dosing pipeline; 190. the bottom of the tower;
210. spraying branch pipes;
310. a mesh sieve plate; 320. a pH detection controller; 330. a liquid level meter;
151. a first-stage demister; 152. a secondary demister; 153. a back-flushing mechanism.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The utility model provides a wet flue gas deacidification device, which comprises a deacidification tower 100, a liquid supply mechanism, a spraying mechanism 130, a gas detection mechanism and a control mechanism; the deacidification tower 100 is internally provided with a smoke exhaust channel which extends from bottom to top and is communicated with the smoke exhaust channel, the spraying mechanism 130 is positioned in the smoke exhaust channel and is used for spraying liquid containing deacidification liquid, the liquid supply mechanism is used for supplying the spraying liquid to the spraying mechanism 130 and can adjust the concentration of the deacidification liquid, the gas detection mechanism is positioned in the smoke exhaust channel, the horizontal position of the gas detection mechanism is higher than that of the spraying mechanism, and the liquid supply mechanism, the spraying mechanism 130 and the gas detection mechanism are controlled by the control mechanism.
The column bottom 190 of the deacidification column 100 is a storage part of a circulating liquid, and the circulating liquid contains deacidification liquid. The liquid supply mechanism comprises an extraction mechanism such as a circulating pump, and the circulating liquid at the bottom 190 of the tower is extracted to the spraying mechanism 130 to be sprayed to form spraying liquid. The spray mechanism 130 may have a plurality of evenly distributed spray heads.
After entering, the flue gas rises to react with the spraying contact formed by the spraying mechanism 130, and the acidic gas in the flue gas reacts with the desulfurization agent. The flue gas continues to contact the gas detection mechanism as described above.
The flue gas is produced by the front-end equipment of flue gas wet deacidification device, such as refuse handling installation, when the front-end equipment operating mode is undulant, causes the flue gas to fluctuate. The acid gas solubility of the outlet flue gas can fluctuate along with the outlet flue gas, and the overproof condition can possibly occur.
Therefore, in the present application, a gas detection mechanism for detecting the concentration of the acid gas is disposed at the flue gas outlet 170 of the tower top 160, and the concentration change (mainly hydrogen chloride and sulfur dioxide) of each acid gas in the tower outlet flue gas is fed back to the control mechanism to adjust each operation parameter of the deacidification tower 100.
When the concentration of any one of the outlet gases (hydrogen chloride and sulfur dioxide) exceeds a set ratio of the upper limit of the design value, for example, 80%. The control mechanism increases the flow of the liquid supply mechanism on one hand so as to adjust the spraying amount of the spraying mechanism, and increases the concentration of the deacidification liquid on the other hand, so that the concentration of the acid gas in the outlet flue gas can be reduced under the double actions, the emission standard is reached, and the device is more environment-friendly. When the concentration of the acid gas in the outlet flue gas is below the set proportion of the upper limit of the design value, the adjustment of the liquid supply mechanism can be stopped.
The utility model discloses flue gas wet process deacidification device, gaseous detection mechanism detect smoke exhaust passage's acid gas concentration, thereby control mechanism adjusts the flow regulation that supplies liquid mechanism on the one hand according to the testing result and sprays the volume that sprays of mechanism, and on the other hand adjusts the concentration of taking off the acidizing fluid to the dual function descends acid gas concentration in the export flue gas, reaches emission standard, more environmental protection. Above-mentioned flue gas wet process deacidification device deals with the fluctuation of the flue gas that the operating mode fluctuation of front end equipment brought through self control, according to the concentration adjustment equipment running state of export flue gas to make the acid gas concentration of export flue gas up to standard, more environmental protection.
Further, the liquid supply mechanism comprises a spray pipeline 200 and a medicine adding pipeline 180; the dosing pipeline 180 is connected with the bottom of the tower and is used for adjusting the concentration of the circulating liquid in the deacidification tower 100; the spray pipe 200 is connected to the bottom of the tower and serves to suck the circulating liquid and supply it to the spray mechanism 130.
The control end of the medicine feeding pipeline 180 and the control end of the spraying pipeline 200 are both connected with a control mechanism. When the concentration of any one of the outlet gases (hydrogen chloride and sulfur dioxide) exceeds a set ratio of the upper limit of the design value, for example, 80%. On one hand, the control mechanism controls the drug adding pipeline 180 to add a drug, for example, a drug adding pump of the drug adding pipeline 180 is started, and a drug capable of absorbing acid gas (for example, sodium hydroxide or sodium carbonate solution with certain concentration) is added into the tower bottom 190, so that the pH value of the circulating liquid is increased. On the other hand, the spray pipe 200 is controlled to adjust the flow rate of the circulating liquid, for example, the power of the circulating pump on the spray pipe 200 is increased, so that the spraying amount of the spraying mechanism 130 is adjusted. The concentration of the acid gas in the outlet flue gas can be reduced under the double effects, the emission standard is reached, and the method is more environment-friendly. When the concentration of the acid gas in the outlet flue gas is below the set proportion of the upper limit of the design value, the adjustment of the medicine adding pipeline 180 and the spraying pipeline 200 can be stopped.
Further, a flue gas inlet 110, a cyclone plate 120, a packing layer 140, a demister 150 and a flue gas outlet 170 are sequentially arranged in the deacidification tower 100 from the tower bottom 190 to the tower top 160. A spray mechanism 130 is located between the filler layer 140 and the mist eliminator 150.
The column bottom 190 is a storage location for the circulating liquid. The spraying pipe 200 includes a pumping mechanism such as a circulating pump, and pumps the circulating liquid at the bottom 190 of the tower to the spraying mechanism 130 to spray the circulating liquid, i.e. the circulating liquid spray, and part of the circulating liquid spray contacts with the wall of the reactor to form a circulating liquid water film. The circulating liquid spray and the circulating liquid water film flow downwards and fall back to the tower bottom 190 after reacting with the flue gas.
The flue gas inlet 110 is disposed on the sidewall of the deacidification tower 100, and is preferably disposed tangentially to the deacidification tower 100, so that the flue gas enters the bottom of the deacidification tower 100 tangentially through the flue gas inlet 110 to form a primary rotational flow. On the basis, the flue gas contacts the cyclone plate 120 to form secondary cyclone, so that the turbulence degree of the airflow is improved. The improvement of the turbulence degree of the gas is helpful for the full combination of the gas and the desulfurization agent in the circulating liquid of each form, and the reaction removal efficiency is improved. The air current rises to contact with the circulating liquid water films on the four walls of the deacidification tower 100, and the water film effect is favorable for further improving the dedusting effect of the flue gas.
The spraying mechanism 130 can be provided with a plurality of uniformly distributed nozzles, and the flue gas continuously upwards contacts with the circulating liquid sprayed at high speed on the spraying mechanism 130, contacts with the medicament therein and carries out chemical reaction to form a gas-liquid mixture. Meanwhile, the contact area between gas and liquid is further enlarged on the packing layer 140 by the gas-liquid mixture, so that the reaction is more sufficient and the efficiency is higher. The number of the spraying mechanisms 130 and the packing layers 140 is preferably multiple, and the number of the layers can be adjusted according to the flue gas flow and the liquid-gas ratio. The gas-liquid mixture rises to enter a demister 150 to remove liquid drops and demist to obtain outlet flue gas.
The utility model discloses flue gas wet deacidification device, flue gas follow in flue gas inlet 110 gets into deacidification tower 100, produce the whirl with the contact of whirl board 120, the whirl continues to rise successively in proper order with the circulation liquid water film of tower wall, spray the filler particle reaction formation gas-liquid mixture of mechanism 130 spun circulation liquid hydrojet, packing layer 140. The gas-liquid mixture is demisted by the demister 150 to form outlet flue gas. The gas detection mechanism detects the concentration of the acidic gas in the outlet flue gas and feeds the acidic gas back to the control mechanism. The control mechanism controls the medicine adding pipeline 180 to add the medicine according to the detection result, so that the circulating liquid solubility of the tower bottom 190 is adjusted, and controls the spraying pipeline 200 to adjust the flow rate of the circulating liquid, so that the spraying amount of the spraying mechanism 130 is adjusted, the concentration of the acid gas in the outlet flue gas is reduced under the dual functions, the emission standard is reached, and the environment is protected. Above-mentioned flue gas wet process deacidification device deals with the fluctuation of the flue gas that the operating mode fluctuation of front end equipment brought through self control, according to the concentration adjustment equipment running state of export flue gas to make the acid gas concentration of export flue gas up to standard, more environmental protection.
Further, referring to fig. 1, the tower bottom 190 is further provided with a liquid level control mechanism, the liquid level control mechanism includes a water replenishing pipeline and an overflow valve, and the water replenishing pipeline and the overflow valve are respectively communicated with the tower bottom 190.
The liquid level is set to an upper limit value and a lower limit value, and when the liquid level is lower than the lower limit value, the water replenishing pipeline is started, for example, a water replenishing pump in the water replenishing pipeline is started for replenishing. In addition, the circulation box 300 is provided with an overflow valve, when the liquid level exceeds an overflow port, the overflow valve is automatically opened, overflow liquid is discharged, and a collection tank can be arranged to collect the overflow liquid. When the liquid level in the circulation box 300 is lower than the lower limit, the overflow liquid in the collection tank can be automatically added into the circulation box 300, and then the water replenishing pump is started.
Further, referring to fig. 1, a circulation box 300 communicated with the tower bottom 190 is arranged outside the deacidification tower 100, and a mesh sieve plate 310 is arranged at the communication position of the circulation box 300 and the tower bottom 190. The dosing pipeline 180, the spraying pipeline 200 and the water supplementing pipeline are all communicated with the tower bottom 190 through a circulating box 300.
The circulation box 300 is additionally arranged and can store more circulation liquid. The dosing pipeline 180, the spraying pipeline 200 and the water supplementing pipeline are connected to the circulating box 300, and the installation and operation space of each pipeline is larger, so that the installation and maintenance are convenient. The circulation box 300 and the tower body may be an integrated structure, and the middle part is communicated with each other through a mesh screen plate 310. The circulating liquid enters the circulating box 300 through the mesh sieve plate 310, and meanwhile, large particles of substances easy to block are blocked, so that pump bodies of various pipelines are prevented from being damaged.
Further, referring to fig. 1, a pH detection controller 320 and a liquid level meter 330 are provided in the column bottom 190 or the circulation tank 300. The spray pipe 200 and/or the spray mechanism 130 are provided with a flow meter. The feedback end of the pH detection controller 320, the feedback end of the liquid level meter 330 and the feedback end of the flow meter are all connected with the control mechanism.
The level gauge 330 may detect the liquid level in the circulation tank 300 or the column bottom 190, which is fed back to the control mechanism. The control mechanism controls the water replenishing pipeline to make corresponding actions according to the detection value, and when the liquid level is lower than the set value, water is replenished, and when the liquid level reaches a high liquid level, water is stopped.
The pH detection controller 320 detects the pH value of the circulating liquid and feeds the pH value back to the control mechanism. The medicament in the circulating liquid continuously reacts with the acid gas in the smoke gas to be consumed, and meanwhile, the tower bottom 190 or the circulating box 300 has the action of water supplement, so that the pH value of the circulating liquid is in the process of dynamic change. And the target pH of the circulating liquid is different at different stages. If the concentration of any gas in the outlet flue gas exceeds the set proportion of the upper limit of the design value, the desulfurizing tower is in an adjusting stage, the target pH value of the circulating liquid is relatively high, so as to rapidly reduce the concentration of the acid gas in the outlet flue gas, if the target pH value of the circulating liquid is possibly 11, and if the concentration of any gas in the outlet flue gas does not exceed the set proportion of the upper limit of the design value, the desulfurizing tower is in a stable operation stage, and the target pH value of the circulating liquid is possibly 6-8.5. Therefore, the control mechanism controls the dosing pipeline 180 and the water supplementing pipeline to perform corresponding actions according to the current pH value and the current state target pH value, when the pH value is too low, the water supplementing pipeline can be temporarily closed, and the dosing pipeline 180 is opened, and conversely, the dosing pipeline 180 can be closed, and the water supplementing pipeline is opened.
Further, referring to fig. 1, the chemical feeding line 180 and the water replenishing line share a communication pipe to be communicated with the circulation tank 300, and the communication pipe is communicated with one of the chemical feeding line 180 and the water replenishing line through a three-way valve.
The chemical feeding pipeline 180 and the water replenishing pipeline are not required to be opened at the same time generally, one communicating pipe is shared to be communicated with the circulating box 300, and the communicating pipe can be opened by controlling one communicating pipe through the three-way valve, so that the overall length of the pipeline can be reduced, the cost is reduced, and meanwhile, the size of the pipeline structure is more simplified.
Further, referring to fig. 1, the plurality of packing layers 140 and the plurality of spraying mechanisms 130 are provided, and the packing layers 140 and the spraying mechanisms 130 are alternately distributed at intervals in the height direction. The distance between two adjacent layers of fillers is 1-1.5 m, and the thickness of the filler layer 140 is 15-30 cm. The shower pipe 200 includes a plurality of shower branches 210 correspondingly coupled to the shower mechanism 130. The filler layer 140 is a pall filler layer 140, and the specific surface area of the pall filler layer 140 is 200m2/m3～220m2/m3。
The packing layer 140 and the spraying mechanism 130 are multiple and are alternately distributed at intervals along the height direction, and specifically, one packing layer 140 and one spraying mechanism 130 are arranged. The particular number of packing layers 140 and spray mechanisms 130 can be based on the particular towerHeight and process requirements are set. The distance between two layers of packing is generally between 1m and 1.5m, and the thickness of the packing layer 140 is between 15cm and 30 cm. The pall filler has the structural characteristic of high specific surface area, and the specific surface area is 200m2/m3-220m2/m3The gas-liquid contact area can be increased, the gas-liquid reaction time is prolonged, and the removal efficiency is improved.
Further, referring to fig. 1, the demister 150 includes a first demister 151 for removing large particle droplets and a second demister 152 for removing small particle droplets, which are sequentially distributed from the bottom 190 to the top 160 of the tower. The deacidification tower is also provided with a back-washing mechanism 153 for cleaning the first-stage demister 151 and the second-stage demister 152.
The first-stage demister 151 and the second-stage demister 152 can remove mist well. The backwashing mechanism 153 is connected to backwashing water to backwash the demister 150, and the demister is cleaned for recycling.
The utility model discloses the second aspect provides an adopt above-mentioned flue gas wet process deacidification device's flue gas wet process deacidification method.
The wet flue gas deacidification method, referring to fig. 2, comprises the following steps:
and S100, spraying the circulating liquid into circulating liquid spray liquid, and contacting part of the circulating liquid spray liquid with the wall of the reactor to form a circulating liquid water film. The circulating liquid is an alkaline solution containing sodium ions.
And S200, forming cyclone flow by the flue gas, and reacting the cyclone flow rising with a circulating liquid water film, a circulating liquid spray liquid and filler particles in sequence to form a gas-liquid mixture.
And S300, demisting the gas-liquid mixture to form outlet flue gas. When the concentration of the acid gas in the outlet flue gas exceeds 80% of the designed upper limit of the acid gas, the concentration of the circulating liquid is adjusted to the pH value of 11, and the spraying amount of the circulating liquid is increased. Acid gases include hydrogen chloride and sulfur dioxide. The upper limit of the concentration of the hydrogen chloride is 50mg/m3The upper limit value of the sulfur dioxide concentration is 80mg/m3。
The wet flue gas deacidification method can be carried out in the wet flue gas deacidification device. The circulating liquid is an alkaline solution containing sodium ions, and is specifically prepared by using sodium hydroxide or sodium carbonate as a desulfurization agent, so that the risk of scaling of equipment and pipelines can be reduced, and the service life of the equipment is prolonged. The formation process of the circulating liquid spray, the circulating liquid water film, the gas-liquid mixture and the outlet flue gas can refer to the corresponding steps of the flue gas wet deacidification device.
Detecting the concentration change (mainly hydrogen chloride and sulfur dioxide) of each acid gas in the outlet flue gas to adjust each operation parameter, wherein the upper limit value of the hydrogen chloride concentration is 50mg/m3The upper limit value of the sulfur dioxide concentration is 80mg/m3. When the concentration of any one of the outlet gases (hydrogen chloride and sulfur dioxide) exceeds eighty percent of the upper limit of the design value, the frequency of the circulating pump is automatically increased, the spraying amount of the circulating liquid is increased, the dosing pump is started at the same time, a medicament (sodium hydroxide or sodium carbonate solution with certain concentration) is added into the circulating box 300 to increase the pH value of the circulating liquid, and when the pH value reaches 11, the dosing pump is automatically stopped.
The utility model discloses flue gas wet process deacidification method, circulating liquid form circulating liquid water film and circulating liquid hydrojet in the reactor. The flue gas reacts with the circulating liquid water film, the circulating liquid spray liquid and the filler particles in sequence, and outlet flue gas is formed after demisting. When the concentration of the acid gas in the outlet flue gas exceeds 80% of the upper limit of the acid gas design value, the concentration of the circulating liquid is adjusted to be a proper pH value, and the spraying amount of the circulating liquid is increased, so that the concentration of the acid gas in the outlet flue gas is reduced and is prevented from exceeding the acid gas design value. According to the wet flue gas deacidification method, the fluctuation of the flue gas caused by the fluctuation of the working condition of the front-end equipment is coped with through the control of the method, and the process parameters are adjusted according to the concentration of the outlet flue gas, so that the concentration of the acid gas of the outlet flue gas reaches the standard, and the method is more environment-friendly.
Further, when the concentration of the acid gas in the outlet flue gas is lower than 80% of the designed upper limit of the acid gas, the concentration of the circulating liquid is adjusted to be 6-8.5.
When the concentration of the acid gas in the outlet flue gas is lower than 80% of the design upper limit of the acid gas, the stable operation stage is performed, and the target pH value of the circulating liquid is 6-8.5. The wet flue gas deacidification method can be carried out in the wet flue gas deacidification device. In the reaction process of the circulating liquid and the acid gas, the pH value is continuously reduced, when the pH value is lower than the lower limit value, the medicine adding pipeline 180 is automatically started, sodium hydroxide or sodium carbonate is added as a desulfurizing agent, and the reaction is stopped after the pH value is increased to 8.5.
Further, the temperature range of the flue gas is 100-160 ℃. The reaction temperature range in the reactor is 70-100 ℃. The gas velocity in the reactor is 1.5-3 m/s. The discharge value of the outlet flue gas is that the concentration of the hydrogen chloride is lower than 5mg/m3The concentration of sulfur dioxide is less than 10mg/m3。
The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.
Claims (10)
1. A wet flue gas deacidification device is characterized by comprising a deacidification tower, a liquid supply mechanism, a spraying mechanism, a gas detection mechanism and a control mechanism;
the deacidification tower is characterized in that a smoke exhaust channel extends from bottom to top and is arranged in the deacidification tower in a penetrating mode, the spraying mechanism is located in the smoke exhaust channel and is used for spraying liquid containing deacidification liquid, the liquid supply mechanism is used for supplying the spraying liquid to the spraying mechanism and can adjust the concentration of the deacidification liquid, the gas detection mechanism is located in the smoke exhaust channel, the horizontal position of the gas detection mechanism is higher than the horizontal position of the spraying mechanism, and the liquid supply mechanism, the spraying mechanism and the gas detection mechanism are all controlled by the control mechanism.
2. The wet flue gas deacidification apparatus as claimed in claim 1, wherein said liquid supply mechanism comprises a spray pipe and a dosing pipe; the dosing pipeline is connected with the bottom of the tower and is used for adjusting the concentration of the circulating liquid in the deacidification tower; the spraying pipeline is connected with the bottom of the tower and is used for sucking the circulating liquid and supplying the circulating liquid to the spraying mechanism.
3. The wet flue gas deacidification device according to claim 2, wherein a flue gas inlet, a cyclone plate, a packing layer, a demister and a flue gas outlet are further sequentially arranged in the deacidification tower from bottom to top; the spraying mechanism is positioned between the packing layer and the demister;
the gas detection mechanism is arranged between the smoke outlet and the demister.
4. The wet flue gas deacidification apparatus as claimed in claim 3, wherein a liquid level control mechanism is further provided at the tower bottom, the liquid level control mechanism comprises a water replenishing pipeline and an overflow valve, and the water replenishing pipeline and the overflow valve are respectively communicated with the tower bottom.
5. The wet flue gas deacidification device according to claim 4, wherein a circulation box communicated with the tower bottom is arranged outside the deacidification tower, and a mesh sieve plate is arranged at the communication part of the circulation box and the tower bottom;
the dosing pipeline, the spraying pipeline and the water supplementing pipeline are communicated with the tower bottom through the circulating box.
6. The wet flue gas deacidification device according to the claim 5, wherein a pH detection controller and a liquid level meter are arranged in the tower bottom or the circulating tank;
the spraying pipeline and/or the spraying mechanism is/are provided with a flowmeter;
and the feedback end of the pH detection controller, the feedback end of the liquid level meter and the feedback end of the flow meter are connected with the control mechanism.
7. The wet flue gas deacidification apparatus as claimed in claim 5, wherein the dosing pipeline and the water replenishing pipeline share a communicating pipe to communicate with the circulation tank, and the communicating pipe is communicated with one of the dosing pipeline and the water replenishing pipeline through a three-way valve.
8. The wet flue gas deacidification device according to claim 3, wherein a plurality of the packing layers and the spraying mechanisms are provided, and the packing layers and the spraying mechanisms are alternately distributed at intervals in the height direction; the distance between two adjacent packing layers is 1-1.5 m, and the thickness of the packing layer is 15-30 cm; the spraying pipeline comprises a plurality of spraying branch pipes correspondingly connected with the spraying mechanism.
9. The wet flue gas deacidification device according to claim 8, wherein the filler layer is a pall filler layer, and the specific surface area of the pall filler layer is 200m2/m3～220m2/m3。
10. The wet flue gas deacidification device according to any one of claims 3 to 9, wherein the demister comprises a primary demister and a secondary demister, which are distributed in sequence from the bottom of the tower to the top of the tower, for removing large-particle liquid droplets and for removing small-particle liquid droplets;
the deacidification tower is also provided with a back washing mechanism for cleaning the first-stage demister and the second-stage demister.
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| CN111013365A (en) * | 2019-12-30 | 2020-04-17 | 深圳续盈环保科技有限公司 | Wet flue gas deacidification device and method |
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Address after: 518000, Building 10, A2603, Shenzhen Bay Science and Technology Ecological Park, No. 10 Gaoxin South Ninth Road, Gaoxin Community, Yuehai Street, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Xuying Environmental Protection Technology Co.,Ltd. Country or region after: China Address before: 518000 R & D center No.1, Taohuayuan science and Technology Innovation Park, Tiegang community, Xixiang street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Xuying Environmental Protection Technology Co.,Ltd. Country or region before: China |