CN212127543U - Ammonia-containing waste gas recycling device - Google Patents
Ammonia-containing waste gas recycling device Download PDFInfo
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- CN212127543U CN212127543U CN202020343535.XU CN202020343535U CN212127543U CN 212127543 U CN212127543 U CN 212127543U CN 202020343535 U CN202020343535 U CN 202020343535U CN 212127543 U CN212127543 U CN 212127543U
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 239000002912 waste gas Substances 0.000 title claims abstract description 63
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 53
- 238000004064 recycling Methods 0.000 title claims abstract description 25
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims abstract description 132
- 238000006243 chemical reaction Methods 0.000 claims abstract description 126
- 238000001556 precipitation Methods 0.000 claims abstract description 115
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000001099 ammonium carbonate Substances 0.000 claims abstract description 67
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims abstract description 47
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims abstract description 47
- 235000012501 ammonium carbonate Nutrition 0.000 claims abstract description 20
- 238000005507 spraying Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 51
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 50
- 239000007789 gas Substances 0.000 claims description 38
- 235000011089 carbon dioxide Nutrition 0.000 claims description 35
- 238000005273 aeration Methods 0.000 claims description 30
- 230000007246 mechanism Effects 0.000 claims description 28
- 238000011084 recovery Methods 0.000 claims description 21
- 238000010992 reflux Methods 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 7
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 24
- 238000002425 crystallisation Methods 0.000 abstract description 9
- 230000008025 crystallization Effects 0.000 abstract description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 26
- 239000002351 wastewater Substances 0.000 description 19
- 238000010521 absorption reaction Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 8
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 8
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 8
- 235000011130 ammonium sulphate Nutrition 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 239000002910 solid waste Substances 0.000 description 5
- 235000019270 ammonium chloride Nutrition 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000009292 forward osmosis Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000005586 carbonic acid group Chemical group 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000001728 nano-filtration Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- JTXJZBMXQMTSQN-UHFFFAOYSA-N amino hydrogen carbonate Chemical compound NOC(O)=O JTXJZBMXQMTSQN-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000004177 carbon cycle Methods 0.000 description 1
- 150000005323 carbonate salts Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The utility model provides a recycling device for ammonia-containing waste gas, which comprises a reaction tower and an extraction tower; an ammonia waste gas interface is arranged at the position close to the lower end of the reaction tower, a reaction tank for forming an ammonium carbonate solution is arranged in the reaction tower, and carbonic acid reacts with sufficient ammonia gas to generate the ammonium carbonate solution; a plurality of spraying pipes for spraying carbonic acid are arranged in the reaction tower at intervals; the precipitation tower is internally provided with a precipitation tank for forming supersaturated ammonium bicarbonate solution, the bottom of the precipitation tank is a conical tank bottom, the bottom of the conical tank bottom is provided with a precipitation discharge port, and the liquid outlet of the reaction tank is connected with the liquid inlet of the precipitation tower. The utility model discloses can retrieve the ammonia in the waste gas as much as possible, the ammonium bicarbonate crystal of its acquisition, easy resourceization practical application and sale have saved the problem that the tradition needs evaporative crystallization, utilize the supersaturation to appear the principle and can realize, can not form the secondary and give up admittedly, and economic benefits is high.
Description
Technical Field
The utility model relates to a chemical industry equipment technical field, in particular to contain ammonia waste gas recovery and recycle device.
Background
With the progress of science and technology and the development of economy, waste gas and waste water are generated and discharged in industries, agriculture, breeding industry and the like all around, and the problem of environmental protection is increasingly prominent.
Nineteen points of the Party: at present, the ecological environment of China is good in stability, but the effect is not stable, and more problems exist, such as the concentration of industrial solid wastes in an industrial gathering area becomes one of the core bottlenecks restricting the healthy development of regional industries and the protection of regional ecology; the economic system of green low-carbon cycle development is one of the main characteristics of high-quality development, and is the development of less resource consumption, low pollution emission and high technology content. At present, the economy of China still has the problems of high investment, high consumption, high emission and low benefit. The environmental protection enterprise can start from pollution control, uses three industries as a core, takes the economic development of low-carbon green circulation as a target, grasps the stock economy and the incremental economy market, carries out green transformation on the stock economy by using the green circulation low-carbon concept, technology and mode, carries out green construction on the incremental economy, promotes transformation and upgrade of the traditional industry, greatly improves the green degree of the national economy, and forms the space pattern, the industrial structure, the production mode and the life mode which save resources and protect the environment.
At present, the excessive discharge of ammonia nitrogen directly influences the environmental protection treatment of waste gas and waste water of chemical enterprises, which becomes a bottleneck restricting the continuous development of enterprises, and the treatment of ammonia nitrogen waste gas and waste water becomes the primary environmental protection problem of related chemical enterprises. In the treatment of ammonia nitrogen waste gas and wastewater, if a traditional stripping and adsorption method is adopted and solutions such as sulfuric acid and hydrochloric acid are used as absorption liquid, the produced ammonium chloride and ammonium sulfate have low added value benefit due to low purity, even cannot be treated outwards, and are easy to generate secondary pollution; for example, a chinese utility model patent (application No. 201310534904.8) entitled method for treating high-salt high-ammonia nitrogen wastewater, which adopts a process flow of membrane absorption + nanofiltration + forward osmosis. Firstly, taking a sulfuric acid solution as an absorption liquid, and converting ammonia nitrogen in the wastewater into ammonium sulfate by adopting membrane absorption; secondly, further concentrating the ammonium sulfate solution by nanofiltration; then taking the concentrated ammonium sulfate solution as a forward osmosis driving liquid, taking high-salinity wastewater subjected to membrane absorption and ammonia nitrogen removal as a forward osmosis feeding liquid, and performing forward osmosis concentration treatment; after being diluted, the ammonium sulfate solution as the driving liquid is partially returned to the nanofiltration unit for circulating concentration treatment. The sulfuric acid solution is used as the absorption liquid, the converted ammonium sulfate has low utilization value, secondary solid waste is easily formed, the economic benefit of waste water and waste gas treatment of enterprises is influenced, and certain defects exist in combination with cost reasons. Therefore, the research and development of economical, practical and safe ammonia nitrogen treatment equipment and process have important significance for protecting the environment.
Ammonium bicarbonate is a carbonate salt which is a white compound, is in the form of granular, plate or column crystals, and has ammonia odor. The tail gas of power plants and incineration plants needs denitration treatment, urea can be used for hydrolysis and then denitration is carried out, and the preparation of ammonium bicarbonate by carbonic acid is an important outlet for recycling ammonia nitrogen treatment resources. (NH)4)2CO3(ammonium carbonate) has a solubility of about 100g (solvent 100g) at 20 ℃ NH4HCO3(ammonium bicarbonate) has a solubility of about 21.7g at 20 ℃ and NH at the same temperature4HCO3More easily crystallized and therefore the difference in solubility between the two can be used to generate, first, more soluble (NH)4)2CO3；CO2When the amount of (A) is further increased, NH is formed4HCO3And then supersaturated and precipitated to be used as a denitration agent.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The to-be-solved technical problem of the utility model is to provide an ammonia waste gas recovery recycles device aims at the ammonia in the abundant absorption waste gas, saves the evaporation crystallization step, and the saving device cost, the ammonium bicarbonate that the crystallization obtained can regard as the denitration agent to use, can not form the secondary and give up admittedly, realizes the purpose that waste gas recovery recycled.
(II) technical scheme
In order to solve the technical problem, the utility model provides an contain ammonia waste gas recovery and recycle device, include: reaction tower set, precipitation tower set and carbonic acid generation mechanism(ii) a The reaction tower group comprises at least one reaction tower, and an ammonia waste gas interface is arranged at the lower end of the reaction tower and used for accessing ammonia-containing tail gas, such as ammonia-containing tail gas blown off by ammonia nitrogen wastewater; a reaction tank for forming an ammonium carbonate solution is arranged in the reaction tower, and carbonic acid reacts with sufficient ammonia gas to generate the ammonium carbonate solution; a plurality of spray pipes for spraying carbonic acid are arranged in the reaction tower at intervals, the spray pipes are connected with the carbonic acid, and the carbonic acid is correspondingly sprayed into the reaction tank; the precipitation tower group comprises at least one precipitation tower, a precipitation pool for forming supersaturated ammonium bicarbonate solution is arranged in the precipitation tower, the bottom of the precipitation pool is formed into a conical pool bottom, the bottom of the conical pool bottom is provided with a precipitation discharge port, and the precipitation tower is provided with a discharge valve at the precipitation discharge port; the liquid outlet of the reaction tank is connected with the liquid inlet of the precipitation tower; the carbonic acid generating mechanism comprises a first carbonic acid mechanism used for being connected to the spraying pipe and a second carbonic acid mechanism used for being connected to the precipitation pool; wherein, the bottom of the precipitation tower is provided with a reflux outlet, and the reaction tower is provided with a reflux inlet communicated with the reflux outlet. The absorption liquid of the device is carbonic acid and enters the reaction tank in a spraying mode; the solubility of ammonium carbonate is greater than that of ammonium bicarbonate, so that ammonia gas in the waste gas is absorbed in the reaction tower as much as possible to form ammonium carbonate solution; secondly, the ammonium carbonate solution is connected with the liquid inlet of the precipitation tower through the liquid outlet, and CO is introduced into the precipitation pool of the precipitation tower2Further forming supersaturated ammonium bicarbonate solution, crystallizing ammonium bicarbonate and discharging from a precipitation discharge port at the bottom of the conical pool; the ammonium bicarbonate crystals at the precipitated discharge outlet can be output to the outside through the screw conveyor, and the recovered ammonium bicarbonate crystals can be applied to a denitration process of a power plant, so that the method is extremely favorable for how to treat the recovered ammonia gas.
Furthermore, a backflow control valve is installed on a connecting pipeline between the backflow outlet and the backflow inlet, after the concentration of the ammonium bicarbonate solution in the precipitation tank is lower than a set threshold value, the backflow control valve is opened, and the ammonium bicarbonate solution in the precipitation tank is conveyed to the outlet in a backflow mode through a pumpThe reaction tank is provided with a reaction chamber. The reaction formula in the reaction tank is as follows: 2NH3+CO2+H2O＝(NH4)2CO3In which NH3The access amount is sufficient; the reaction formula in the precipitation tank is as follows: NH (NH)3+CO2+H2O＝NH4HCO3Generation of supersaturated NH4HCO3To make NH4HCO3Crystallizing and precipitating from the precipitation discharge port.
Further, the first carbonic acid mechanism is used for preparing carbonic acid by a pressurized dissolved gas method and comprises a first carbonic acid dissolved gas tank and H arranged on the reaction tower2O water inlet, the first dissolved carbonic acid gas tank comprises first CO2The system comprises a gas inlet and a first carbonic acid liquid outlet, wherein carbonic acid is formed in a first carbonic acid gas dissolving tank, the first carbonic acid liquid outlet is connected to a spray pipe, a circulating port of a reaction tank is connected with a circulating pump, and the pressure in the first carbonic acid gas dissolving tank is 0.2-0.6 MPa; and a first circulation outlet at the bottom of the reaction tank is connected to a first circulation inlet of the first dissolved carbonic acid gas tank through a first dissolved gas pump.
Further, the first carbonic acid mechanism can also prepare carbonic acid by an aeration method, and comprises H arranged on the reaction tower2O water inlet and first CO2An air inlet is arranged at the bottom of the reaction tank and is connected with the first CO2A first aeration pipe connected with the air inlet, wherein a circulating port of the reaction tank is connected to the spray pipe through a circulating pump, and CO at the first aeration pipe2And said H2H connected with O water inlet2The O reacts to form carbonic acid.
Further, the second carbonic acid mechanism prepares carbonic acid by an aeration method and comprises second CO arranged on the precipitation tank2An air inlet is arranged in the precipitation tank, and the second CO is arranged in the precipitation tank2And the second aeration pipe is connected with the air inlet.
Further, the second carbonic acid mechanism can also prepare carbonic acid by a pressurized dissolved gas method, and comprises a second carbonic acid dissolved gas tank which is provided with third CO2An air inlet and a second carbonic acid outlet, the second carbonic acid outletThe liquid port is connected to a carbonic acid liquid inlet of the precipitation tower; and a second circulation outlet of the precipitation pool is connected to a second circulation inlet of the second dissolved carbonic acid gas tank through a second dissolved gas pump.
Further, this technical scheme still includes a method that contains ammonia waste gas recovery and recycle device, adopts above-mentioned an containing ammonia waste gas recovery and recycle device, includes the following step:
s001, introducing ammonia-containing waste gas, and introducing the ammonia-containing waste gas into an ammonia waste gas interface of the reaction tower to enable ammonia gas in the waste gas to enter the tower of the reaction tower;
s002, spraying carbonic acid, and preparing ammonium carbonate in the reaction tank; spraying carbonic acid prepared by a first carbonic acid mechanism through a plurality of spray pipes arranged in the reaction tower, and reacting the carbonic acid with sufficient ammonia gas in a reaction tank of the reaction tower to form an ammonium carbonate solution;
s003, preparing ammonium bicarbonate in the precipitation tank; the solution in the reaction tank is connected with a liquid inlet of the precipitation tower through a liquid outlet, and carbonic acid is introduced into the precipitation tank of the precipitation tower through a second carbonic acid mechanism to prepare and form ammonium bicarbonate;
and step S004, supersaturation crystallization is carried out to separate out ammonium bicarbonate, ammonium bicarbonate crystals are formed by crystallization at the bottom of the conical tank bottom at the bottom of the separation tank and are separated out from the separation discharge port.
Further, the reaction formula in the reaction tank in step S002 is: 2NH3+CO2+H2O＝(NH4)2CO3In which NH3The access amount is sufficient; the reaction formula in the precipitation tank in step S003 is: NH (NH)3+CO2+H2O＝NH4HCO3The solubility of the ammonium carbonate is higher than that of the ammonium bicarbonate, and a supersaturated ammonium bicarbonate solution is arranged in the precipitation tank, so that ammonium bicarbonate crystals are crystallized and precipitated at the bottom of the conical tank; in the step S004, when the concentration of the ammonium bicarbonate solution in the precipitation tank is lower than the set threshold, the reflux control valve is opened, and the ammonium bicarbonate solution in the precipitation tank is refluxed through the reflux outlet of the precipitation tower and the reflux inlet of the reaction towerAnd conveying the mixture into the reaction tank.
Further, the first carbonic acid mechanism in the step S002 adopts a pressurized dissolved gas method to prepare carbonic acid, and specifically includes: step S0021, H in the first dissolved carbonic acid gas tank2O water inlet connected to H2O; step S0022, first CO in the first dissolved carbonic acid gas tank2Air inlet connected with CO2(ii) a Step S0023, the carbonic acid formed in the first carbonic acid gas dissolving tank is connected to a spray pipe in the reaction tower through a first carbonic acid liquid outlet and is sprayed into the reaction tank; the pressure in the first carbonic acid gas dissolving tank is 0.2-0.6 MPa; a first circulation outlet at the bottom of the reaction tank is connected to a first circulation inlet of the first dissolved carbonic acid gas tank through a first dissolved gas pump; the second carbonic acid means in said step S003 produces carbonic acid by aeration through said second CO2Introducing CO into a second aeration pipe in the precipitation tank through an air inlet2。
Further, the first carbonic acid mechanism in the step S002 may further adopt an aeration method to prepare carbonic acid, and specifically includes: step S0021, H in reaction column2The water inlet of the O is connected with the H2O; step S0022, connecting CO into a first aeration pipe at the bottom of the reaction tank2(ii) a Step S0023, forming carbonic acid in a reaction tank, wherein a circulating port of the reaction tank is connected to the spray pipe through a circulating pump and sprayed into the reaction tank; the second carbonic acid mechanism in the step S003 is configured to prepare carbonic acid by a pressurized dissolved gas method, and specifically includes: step S0031, sequentially passing through a second circulation outlet, a second dissolved air pump and a second circulation inlet, and conveying the solution in the precipitation tank to a second carbonic acid dissolved air tank; step S0032, third CO in the second dissolved carbonic acid gas tank2Air inlet connected with CO2(ii) a And step S0033, the solution back-mixed in the second carbonic acid gas dissolving tank is connected to a carbonic acid liquid inlet of the precipitation tower through a second carbonic acid liquid outlet, and the solution returns to the precipitation tank to prepare ammonium bicarbonate.
(III) advantageous effects
The utility model discloses contain ammonia waste gas recovery and recycle device and method possess following advantage:
1) the device is provided with the reaction tower and the precipitation tower, carbonic acid and sufficient ammonia-containing waste gas are sprayed in the reaction tower to form an ammonia carbonate solution, so that ammonia in the waste gas can be absorbed as much as possible, the waste gas treatment efficiency is high, the reaction tower is communicated with the precipitation tower, carbonic acid is introduced into a precipitation tank of the precipitation tower to form a supersaturated ammonia carbonate solution, the solubility of the ammonia carbonate is higher than that of the ammonia carbonate, the ammonia carbonate forms supersaturated crystals at the bottom of the precipitation tank, the recovered ammonia carbonate crystals can be applied to a denitration process of a power plant, the treatment after ammonia recovery is greatly facilitated, secondary solid waste cannot be formed, the recovery value is high, and the effective utilization of resource recovery is realized;
2) the bottom of the precipitation tank is provided with a conical tank bottom, so that precipitated ammonium bicarbonate crystals can be precipitated at the bottom of the conical tank bottom conveniently and can be discharged conveniently;
3) h is dissolved in air by pressurization or aeration2O and CO2Forming carbonic acid, spraying the carbonic acid into the reaction tower, and fully reacting the carbonic acid with ammonia gas in the waste gas;
4) and the ammonium bicarbonate is separated by utilizing the principle of different solubility, so that the step of evaporative crystallization is omitted, and the equipment investment is effectively reduced.
5) The obtained ammonium bicarbonate crystal can be used in actual application such as denitration and the like, and achieves real resource utilization.
6) The device can be applied to the post-treatment of the ammonia nitrogen wastewater air stripping process, the problem that secondary pollution is caused due to the fact that the ammonia sulfate, the ammonium chloride and the like cannot be effectively utilized due to insufficient purity is avoided, the treatment cost of the ammonia nitrogen wastewater is reduced, and the method can realize resource recycling while effectively treating the post-treatment of the high-concentration ammonia nitrogen wastewater, and forms a benign environment-friendly treatment way.
Drawings
FIG. 1 is a schematic structural view of a first embodiment of the ammonia nitrogen waste gas recycling device of the present invention;
FIG. 2 is a schematic structural view of a second embodiment of the ammonia nitrogen waste gas recycling device of the present invention;
FIG. 3 is a schematic block diagram of the flow of the method of the ammonia nitrogen waste gas recycling device of the present invention;
FIG. 4 is a schematic block diagram of the flow of step two of the embodiment of the method of the ammonia nitrogen waste gas recycling device of the present invention;
FIG. 5 is a schematic block diagram of the flow of the second step of the embodiment of the method of the ammonia nitrogen waste gas recycling device of the present invention;
FIG. 6 is a schematic block diagram of the flow of the second step and the third step of the method of the ammonia nitrogen waste gas recycling device of the present invention;
FIG. 7 is a schematic structural view of a third embodiment of the ammonia nitrogen waste gas recycling device of the present invention;
FIG. 8 is a schematic structural view of a fourth embodiment of the ammonia nitrogen waste gas recycling device of the present invention;
wherein: 1 is a reaction tower, 2 is an ammonia waste gas interface, 3 is a reaction tank, 4 is a spray pipe, 5 is an precipitation tower, 6 is a precipitation tank, 7 is a conical tank bottom, 8 is a precipitation discharge port, 9 is a first carbonic acid gas dissolving tank, 10 is H2O water inlet, 11 is first CO2An air inlet, 12 is a first carbonic acid liquid outlet, 13 is a circulating pump, 14 is a first aeration pipe, 15 is a circulating port, 16 is a liquid outlet, 17 is a liquid inlet, 18 is a second CO2An air inlet, 19 is a second aeration pipe, 20 is a reflux outlet, 21 is a reflux inlet, 22 is a first circulation outlet, 23 is a first dissolved air pump, 24 is a first circulation inlet, 25 is a second dissolved carbonic acid gas tank, 26 is a third CO2The air inlet, 27 is a second carbonic acid liquid outlet, 28 is a carbonic acid liquid inlet, 29 is a second circulation outlet, 30 is a second air dissolving pump, and 31 is a second circulation inlet.
Detailed Description
The first embodiment is as follows:
referring to fig. 1, 3 and 4, the present embodiment provides an apparatus and a method for recycling an ammonia-containing waste gas, where the apparatus includes: the system comprises a reaction tower group, a precipitation tower group and a carbonic acid generation mechanism; the reaction tower group comprises at least one reaction tower 1, an ammonia waste gas interface 2 is arranged at the position, close to the lower end, of the reaction tower 1, a reaction tank 3 for forming an ammonium carbonate solution is arranged in the reaction tower 1, and carbonic acid reacts with sufficient ammonia gas to generate the ammonium carbonate solution; a plurality of spraying pipes 4 for spraying carbonic acid are arranged in the reaction tower 1 at intervals; the precipitation tower group comprises at least one precipitation tower 5, a precipitation pool 6 for forming supersaturated ammonium bicarbonate solution is arranged in the precipitation tower 5, a conical pool bottom 7 is formed at the bottom of the precipitation pool 6, and a precipitation discharge port 8 is arranged at the bottom of the conical pool bottom 7; a liquid outlet 16 of the reaction tank 3 is connected with a liquid inlet 17 of the precipitation tower 5; the carbonic acid generating mechanism comprises a first carbonic acid mechanism used for being connected to the spraying pipe 4 and a second carbonic acid mechanism used for being connected to the precipitation pool 6; wherein, the bottom of the precipitation tower 5 is provided with a reflux outlet 20, and the reaction tower 1 is provided with a reflux inlet 21 communicated with the reflux outlet 20.
Wherein, the reaction formula in the reaction tank 3 is: 2NH3+CO2+H2O＝(NH4)2CO3In which NH3The (ammonia) access amount is sufficient; the reaction formula in the precipitation pool 6 is as follows: NH (NH)3+CO2+H2O＝NH4HCO3Generation of supersaturated NH4HCO3To make NH4HCO3Crystallized and precipitated from the precipitation discharge port 8.
Wherein, this device is particularly useful for handling the ammonia-containing tail gas that ammonia nitrogen waste water air stripping handled and comes out, and the ammonium bicarbonate crystal after the recovery can be used in the denitration technology of power plant, is favorable to how to handle after the ammonia recovery extremely.
Referring to fig. 1, a backflow control valve is installed on a connection pipeline between the backflow outlet 20 and the backflow inlet 21, and when the concentration of the ammonium bicarbonate solution in the precipitation tank 6 is lower than a set threshold value, the backflow control valve is opened to convey the ammonium bicarbonate solution in the precipitation tank 6 to the reaction tank 3 in a backflow manner.
The absorption liquid of the device is carbonic acid and enters the reaction tank 3 in a spraying mode; the solubility of ammonium carbonate is greater than that of ammonium bicarbonate, so that ammonia gas in the waste gas is absorbed as much as possible in the reaction tower 1 to form ammonium carbonate solution; secondly, the ammonium carbonate solution is connected with a liquid inlet 17 of the precipitation tower 5 through a liquid outlet 16, and CO is connected into a precipitation pool 6 of the precipitation tower 52Further forming supersaturated ammonium bicarbonate solution, crystallizing ammonium bicarbonate and discharging from a precipitation discharge port 8 at the bottom of the conical pool bottom 7; the ammonium bicarbonate crystals at the precipitation discharge port 8 may be discharged to the outside through a screw conveyor.
Referring to fig. 1 and 4, the first carbonic acid means for producing carbonic acid by a pressurized dissolved gas method includes a first carbonic acid dissolved gas tank 9 and H disposed on the reaction tower 12 O water inlet 10, the first carbonic acid gas dissolving tank 9 comprises first CO2The device comprises an air inlet 11 and a first carbonic acid liquid outlet 12, wherein carbonic acid is formed in a first carbonic acid gas dissolving tank 9, the first carbonic acid liquid outlet 12 is connected to a spray pipe 4, and the pressure in the first carbonic acid gas dissolving tank 9 is 0.2-0.6 MPa; a circulating port 15 of the reaction tank 3 is connected with a circulating pump 13 and enters the spraying pipe 4 through the circulating pump 13; a first circulation outlet 22 at the bottom of the reaction tank 3 is connected to a first circulation inlet 24 of the first carbonic acid gas dissolving tank 9 through a first gas dissolving pump 23, liquid in the reaction tank 3 is pumped into the first carbonic acid gas dissolving tank 9 all the time through the first gas dissolving pump 23, and then enters the spray pipe 4 through the first carbonic acid liquid outlet 12. Wherein, the reaction tank 3 of the device is provided with a liquid level detector, and H is arranged after the liquid level is lower than the set height2The water inlet 10 is opened to discharge water.
Referring to FIG. 1, the second carbonation unit produces carbonic acid by an aeration method including second CO disposed on the precipitation tank 62An air inlet 18 is arranged in the separation tank 6 and is provided with a second CO2And a second aeration pipe 19 connected with the air inlet 18.
Referring to fig. 3 and 4, the embodiment further includes a method of recycling the exhaust gas containing ammonia, and the method of recycling the exhaust gas containing ammonia includes the following steps: s001, introducing ammonia-containing waste gas, and introducing the ammonia-containing waste gas into an ammonia waste gas interface 2 of a reaction tower 1 to make ammonia gas in the waste gas enter the tower of the reaction tower 1; s002, preparing ammonia carbonate in a reaction tank; spraying carbonic acid prepared by a first carbonic acid mechanism through a plurality of spray pipes 4 arranged in a reaction tower 1, and reacting the carbonic acid with sufficient ammonia gas in a reaction tank 3 of the reaction tower 1 to form an ammonium carbonate solution; s003, preparing ammonium bicarbonate in the precipitation tank; the solution in the reaction tank 3 is connected with a liquid inlet 17 of the precipitation tower 5 through a liquid outlet 16, and carbonic acid is introduced into the precipitation tank 6 of the precipitation tower 5 through a second carbonic acid mechanism to prepare and form ammonium bicarbonate; and step S004, supersaturated crystals are precipitated out of the ammonium bicarbonate, and ammonium bicarbonate crystals are crystallized at the bottom of the conical tank bottom 7 at the bottom of the precipitation tank 6 and precipitated out from the precipitation discharge port 8.
The reaction formula in the reaction tank 3 in the step S002 is: 2NH3+CO2+H2O＝(NH4)2CO3In which NH3The access amount is sufficient; the reaction formula in the precipitation tank 6 in step S003 is: NH (NH)3+CO2+H2O＝NH4HCO3The solubility of the ammonium carbonate is higher than that of the ammonium bicarbonate, and a supersaturated ammonium bicarbonate solution is arranged in the precipitation tank 6, so that ammonium bicarbonate crystals are crystallized and precipitated at the bottom of the conical tank bottom 7; in step S004, when the concentration of the ammonium bicarbonate solution in the precipitation cell 6 is lower than the predetermined threshold, the reflux control valve is opened, and the ammonium bicarbonate solution in the precipitation cell 6 is fed into the reaction cell 3 through the reflux outlet 20 of the precipitation column 5 and the reflux inlet 21 of the reaction column 1 by reflux.
Referring to fig. 4, the first carbonic acid mechanism in step S002 adopts a pressurized dissolved gas method to prepare carbonic acid, which specifically includes: step S0021, H in the first dissolved carbonic acid gas tank 92 O water inlet 10 to H2O; step S0022, first CO in the first dissolved carbonic acid gas tank 92 Inlet 11 for CO2(ii) a Step S0023, the carbonic acid formed in the first carbonic acid gas dissolving tank 9 is connected to the spray pipe 4 in the reaction tower 1 through the first carbonic acid liquid outlet 12 and is sprayed into the reaction tank 3; the pressure in the first carbonic acid gas dissolving tank 9 is 0.2-0.6 MPa; wherein a first circulation outlet at the bottom of the reaction tank is connected to a first circulation inlet of a first carbonic acid dissolved gas tank through a first dissolved gas pump; the second carbonic acid means in step S003 produces carbonic acid by aeration through the second CO2The air inlet leads CO into a second aeration pipe in the precipitation tank2。
By the method, ammonia gas in the waste gas can be treated as much as possible, the problem of evaporation and crystallization in the prior art is solved by the obtained ammonium bicarbonate crystals, and the method can be realized by utilizing a supersaturation precipitation principle.
According to the device and the method for recycling the ammonia-containing waste gas, the reaction tower and the precipitation tower are arranged, carbonic acid and sufficient ammonia-containing waste gas are sprayed in the reaction tower, ammonia in the waste gas enters the reaction tower to form an ammonia carbonate solution, the treatment efficiency of the ammonia in the waste gas is high, the reaction tower is communicated with the precipitation tower, the carbonic acid is introduced into the precipitation tank of the precipitation tower again to form a supersaturated ammonia carbonate solution, the solubility of the ammonia carbonate is higher than that of the ammonia carbonate, the ammonia carbonate forms supersaturated crystals at the bottom of the precipitation tank, the recovered ammonia carbonate crystals can be applied to a power plant denitration process, the treatment after ammonia recovery is facilitated, secondary solid waste cannot be formed, the recovery value is high, and the effective utilization of resource recovery is realized; the bottom of the precipitation tank is arranged to be a conical tank bottom, so that precipitated ammonium bicarbonate crystals can be precipitated at the bottom of the conical tank bottom conveniently and can be discharged conveniently; carbonic acid is formed by pressurizing dissolved gas or aerating, and ammonia carbonate and ammonia bicarbonate solution are generated as much as possible; the embodiment separates the ammonium bicarbonate by using the principle of different solubility, omits the step of evaporative crystallization, effectively reduces the equipment investment, and can obtain the ammonium bicarbonate crystals which can be used in actual applications such as denitration and the like to achieve real resource utilization.
The method can be applied to the waste gas post-treatment of the ammonia nitrogen waste water blow-off process, avoids the problem of secondary pollution caused by insufficient purity and incapability of effectively utilizing ammonium sulfate, ammonium chloride and the like, reduces the treatment cost of the ammonia nitrogen waste water, realizes resource recovery while effectively treating the high-concentration ammonia nitrogen waste water post-treatment, and forms a benign environment-friendly treatment way.
Example two:
referring to fig. 2, the ammonia-containing waste gas recycling apparatus of the present embodiment is different from the first embodiment in that: the first carbonic acid means of the present embodiment can also produce carbonic acid by an aeration method comprising H provided on the reaction column 12 O water inlet 10 and first CO2 An air inlet 11 is arranged at the bottom of the reaction tank 3 and is connected with the first CO2A first aeration pipe 14 connected with the air inlet 11, a circulating port 15 of the reaction tank 3 is connected to the spraying pipe 4 through a circulating pump 13, and CO at the first aeration pipe 142And H2H connected to O water inlet 102The O reacts to form carbonic acid. Wherein, the reaction tank 3 of the device is provided with a liquid level detector, and H is arranged after the liquid level is lower than the set height2The water inlet 10 is opened to discharge water.
Second carbonic acid machine of this embodimentThe structure can also prepare carbonic acid by a pressurized gas dissolving method, and comprises a second carbonic acid gas dissolving tank 25, wherein the second carbonic acid gas dissolving tank 25 is provided with third CO2 An air inlet 26 and a second carbonic acid liquid outlet 27, wherein the second carbonic acid liquid outlet 27 is connected to a carbonic acid liquid inlet 28 of the precipitation tower 5; the second circulation outlet 29 of the precipitation tank 6 is connected to the second circulation inlet 31 of the second dissolved carbonic acid gas tank 25 through the second dissolved air pump 30.
Referring to fig. 5 and 6, the method for recycling the exhaust gas containing ammonia according to the present embodiment is different from the first embodiment in that the first carbonic acid unit in step S002 of the present embodiment prepares carbonic acid by an aeration method, specifically: step S0021, H in reaction column 12The position of the O water inlet 10 is connected with H2O; step S0022, the first aeration pipe 14 at the bottom of the reaction tank 3 is connected with CO2(ii) a Step S0023, forming carbonic acid in the reaction tank 3, connecting a circulation port 15 of the reaction tank 3 to a spray pipe 4 through a circulation pump 13, and spraying the carbonic acid into the reaction tank 3; the second carbonic acid means in step S003 is for producing carbonic acid by a pressurized dissolved gas method, and specifically includes: step S0031, sequentially passing through a second circulation outlet 29, a second dissolved air pump 30 and a second circulation inlet 31, and conveying the solution in the precipitation tank 6 to a second dissolved carbonic acid gas tank 25; step S0032, third CO in the second dissolved carbonic acid gas tank 252Inlet port 26 for CO2(ii) a And step S0033, the solution after back mixing in the second carbonic acid gas dissolving tank 25 is connected to a carbonic acid liquid inlet 28 of the precipitation tower 5 through a second carbonic acid liquid outlet 27, and returns to the precipitation pool 6 to prepare ammonium bicarbonate.
According to the device and the method for recycling the ammonia-containing waste gas, the reaction tower and the precipitation tower are arranged, carbonic acid and sufficient ammonia-containing waste gas are sprayed in the reaction tower, ammonia in the waste gas enters the reaction tower to form an ammonia carbonate solution, the treatment efficiency of the ammonia in the waste gas is high, the reaction tower is communicated with the precipitation tower, the carbonic acid is introduced into the precipitation tank of the precipitation tower again to form a supersaturated ammonia carbonate solution, the solubility of the ammonia carbonate is higher than that of the ammonia carbonate, the ammonia carbonate forms supersaturated crystals at the bottom of the precipitation tank, the recovered ammonia carbonate crystals can be applied to a power plant denitration process, the treatment after ammonia recovery is facilitated, secondary solid waste cannot be formed, the recovery value is high, and the effective utilization of resource recovery is realized; the bottom of the precipitation tank is arranged to be a conical tank bottom, so that precipitated ammonium bicarbonate crystals can be precipitated at the bottom of the conical tank bottom conveniently and can be discharged conveniently; carbonic acid is formed by pressurizing dissolved gas or aerating, and ammonia carbonate and ammonia bicarbonate solution are generated as much as possible; the embodiment separates the ammonium bicarbonate by using the principle of different solubility, omits the step of evaporative crystallization, effectively reduces the equipment investment, and can obtain the ammonium bicarbonate crystals which can be used in actual applications such as denitration and the like to achieve real resource utilization.
The method can be applied to the waste gas post-treatment of the ammonia nitrogen waste water blow-off process, avoids the problem of secondary pollution caused by insufficient purity and incapability of effectively utilizing ammonium sulfate, ammonium chloride and the like, reduces the treatment cost of the ammonia nitrogen waste water, realizes resource recovery while effectively treating the high-concentration ammonia nitrogen waste water post-treatment, and forms a benign environment-friendly treatment way.
Example three:
referring to fig. 7, the difference between the present embodiment and the first and second embodiments is: the first carbonic acid mechanism prepares carbonic acid by a pressurized gas dissolving method, and the second carbonic acid mechanism prepares carbonic acid by the pressurized gas dissolving method; which is actually a combination of the first carbonate tank 9 part of figure 1 and the second carbonate tank 25 part of figure 2.
Example four:
referring to fig. 8, the difference between the present embodiment and the first and second embodiments is: the first carbonic acid mechanism prepares carbonic acid by an aeration method; the second carbonic acid mechanism prepares carbonic acid by an aeration method; which is actually a combination of the portion of the second aeration tube 19 of fig. 1 and the portion of the first aeration tube 14 of fig. 2.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides an contain ammonia waste gas recovery and recycle device which characterized in that includes:
the reaction tower group comprises at least one reaction tower (1), an ammonia waste gas interface (2) is arranged at the position, close to the lower end, of the reaction tower (1), and a reaction tank (3) for forming an ammonium carbonate solution is arranged in the reaction tower (1); a plurality of spray pipes (4) are arranged in the reaction tower (1) at intervals, carbonic acid is introduced into the spray pipes (4), the carbonic acid is correspondingly sprayed into the reaction tank (3), and the carbonic acid reacts with ammonia gas in sufficient waste gas to generate ammonium carbonate solution;
the separation tower group comprises at least one separation tower (5), and a separation pool (6) for forming supersaturated ammonium bicarbonate solution is arranged in the separation tower (5); a conical pool bottom (7) is formed at the bottom of the precipitation pool (6), and a precipitation discharge port (8) is formed at the bottom of the conical pool bottom (7); a liquid outlet (16) of the reaction tank (3) is connected with a liquid inlet (17) of the precipitation tower (5);
the carbonic acid generating mechanism comprises a first carbonic acid mechanism used for being connected to the spraying pipe (4) and a second carbonic acid mechanism used for being connected to the precipitation pool (6);
wherein the bottom of the precipitation tower (5) is provided with a reflux outlet (20), and the reaction tower (1) is provided with a reflux inlet (21) communicated with the reflux outlet (20).
2. An ammonia-containing waste gas recycling device according to claim 1, wherein a backflow control valve is installed on a connecting pipeline between the backflow outlet (20) and the backflow inlet (21), and when the concentration of the ammonium bicarbonate solution in the precipitation tank (6) is lower than a set threshold value, the backflow control valve is opened to convey the ammonium bicarbonate solution in the precipitation tank (6) back to the reaction tank (3) through a pump; the reaction formula in the reaction tank (3) is as follows: 2NH3+CO2+H2O＝(NH4)2CO3In which NH3The access amount is sufficient;
the reaction formula in the precipitation pool (6) is as follows: NH (NH)3+CO2+H2O＝NH4HCO3Generation of supersaturated NH4HCO3To make NH4HCO3Crystallizing and precipitating from the precipitation discharge port (8).
3. The ammonia-containing waste gas recycling device according to claim 1, wherein the first carbonic acid mechanism is used for preparing carbonic acid by a pressurized dissolved gas method and comprises a first dissolved carbonic acid gas tank (9) and H arranged on the reaction tower (1)2O water inlet (10), the first dissolved carbonic acid gas tank (9) comprises first CO2The device comprises a gas inlet (11) and a first carbonic acid liquid outlet (12), carbonic acid is formed in a first carbonic acid gas dissolving tank (9), the first carbonic acid liquid outlet (12) is connected to a spray pipe (4), and a circulating port (15) of a reaction tank (3) is connected with a circulating pump (13); a first circulation outlet (22) at the bottom of the reaction tank (3) is connected to a first circulation inlet (24) of the first dissolved carbonic acid gas tank (9) through a first dissolved gas pump (23).
4. The ammonia-containing waste gas recycling device according to claim 1, wherein the first carbonic acid means produces carbonic acid by aeration method comprising H disposed on the reaction tower (1)2O water inlet (10) and first CO2An air inlet (11), wherein the bottom of the reaction tank (3) is provided with the first CO2A first aeration pipe (14) connected with the air inlet (11), wherein a circulation port (15) of the reaction tank (3) is connected to the spray pipe (4) through a circulation pump (13), and CO at the position of the first aeration pipe (14)2And said H2H connected with O water inlet (10)2The O reacts to form carbonic acid.
5. The ammonia-containing waste gas recycling device according to claim 1, wherein the second carbonic acid means produces carbonic acid by an aeration method comprising second CO disposed on the precipitation tank (6)2An air inlet (18), and the second CO is arranged in the precipitation tank (6)2A second aeration pipe (19) connected with the air inlet (18).
6. The ammonia-containing exhaust gas recycling device according to claim 1, wherein the second carbonic acid means produces carbonic acid by a pressurized dissolved gas method, and comprises a second dissolved carbonic acid gas tank (25) that contains the ammonia-containing exhaust gas(25) Is provided with a third CO2A gas inlet (26) and a second carbonic acid liquid outlet (27), wherein the second carbonic acid liquid outlet (27) is connected to a carbonic acid liquid inlet (28) of the precipitation tower (5);
and a second circulation outlet (29) of the precipitation pool (6) is connected to a second circulation inlet (31) of the second dissolved carbonic acid gas tank (25) through a second dissolved gas pump (30).
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| CN111439758A (en) * | 2020-03-18 | 2020-07-24 | 宁波上福源环保科技有限公司 | Ammonia-containing waste gas recycling device and method |
| CN111439758B (en) * | 2020-03-18 | 2024-02-23 | 宁波上福源环保科技有限公司 | Ammonia-containing waste gas recycling device and method |
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