CN211133513U - Desulfurization and denitrification device for treating diketene cracking tail gas - Google Patents
Desulfurization and denitrification device for treating diketene cracking tail gas Download PDFInfo
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- CN211133513U CN211133513U CN201922071598.4U CN201922071598U CN211133513U CN 211133513 U CN211133513 U CN 211133513U CN 201922071598 U CN201922071598 U CN 201922071598U CN 211133513 U CN211133513 U CN 211133513U
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Abstract
The utility model discloses a desulfurization and denitrification device for treating diketene cracking tail gas, which comprises a liquid ammonia water storage tank, a pump machine, a denitrification reactor, an air cooler, a water cooler, a pulse type dust remover, an induced draft fan, a desulfurization reaction tank, an aeration tank, a sodium alkali cylinder, a stirring structure and a desulfurization tower, wherein Selective Catalytic Reduction (SCR) is to generate pollution-free nitrogen gas by taking ammonia as a reducing agent and nitrogen oxides (including nitric oxide and nitrogen dioxide) under the catalytic action of a catalyst, and no waste liquid (generating pure water) is generated in the process; the absorption liquid used for the reverse wet-process empty tower spray desulfurization by the sodium-calcium double-alkali method is sodium-calcium double-alkali, the absorption of sulfur dioxide is relatively thorough, the alkali liquor can be regenerated and recycled, and the waste liquid amount is small; can find out more than synthesizing, the utility model provides a little and tail gas of waste liquid volume that the SOx/NOx control technology of diketene schizolysis tail gas treatment produced can discharge to reach standard, and the sewage treatment expense is low, reduces the cost of product.
Description
Technical Field
The utility model relates to a chemical industry field specifically is SOx/NOx control device that diketene schizolysis tail gas handled.
Background
The diketene product is obtained by cracking acetic acid to generate ketene and then carrying out polymerization reaction, wherein the acetic acid cracking reaction can be carried out only by using higher heat, the current company utilizes the heat generated by combustion of water gas and gas to supply the acetic acid cracking reaction, but the components of the combustion of the water gas and gas contain sulfur dioxide, nitrogen oxide and the like, the absorption is carried out by liquid alkali, the main components of absorption liquid are sodium sulfate and sodium nitrite (sodium nitrate), and the absorption liquid alkali is discharged into a sewage treatment system for biochemical treatment, and the absorption by the liquid alkali currently has the following defects: on one hand, liquid caustic soda is easy to crystallize in winter, so that an absorption pipeline is blocked, the absorption effect is influenced, and the tail gas emission is not up to the standard; on the other hand, the absorption liquid has high salinity and is discharged into a sewage treatment system, so that the biochemical treatment difficulty is increased.
Disclosure of Invention
An object of the utility model is to provide a SOx/NOx control device of diketene schizolysis tail gas treatment has solved the easy crystallization of liquid caustic soda when winter, blocks up the absorption pipeline, influences the absorption effect, can lead to exhaust emissions not up to standard, and absorption liquid salinity is high, emits into sewage treatment system, increases the technical problem of the biochemical treatment degree of difficulty.
The purpose of the utility model can be realized by the following technical scheme:
A desulfurization and denitrification device for treating diketene cracking tail gas comprises a liquid ammonia water storage tank, a pump machine, a denitrification reactor, an air cooler, a water cooler, a pulse type dust remover, an induced draft fan, a desulfurization reaction tank, an aeration tank, a sedimentation tank, a clear liquid tank, a clear water tank, a soda tank, a stirring structure and a desulfurization tower, wherein a liquid outlet of the liquid ammonia water storage tank is fixedly connected with a liquid inlet of the pump machine through a liquid guide pipe, the denitrification reactor is fixedly connected with a liquid discharge pipe of the pump machine through a liquid guide pipe, the air cooler and the water cooler are arranged in parallel through a guide pipe, a discharge port of the denitrification reactor is fixedly connected with a feed inlet of the air cooler through a guide pipe, a feed inlet of the pulse type dust remover is connected with a discharge port of the water cooler through a guide pipe, the induced draft fan is arranged between the pulse type dust remover and the desulfurization tower, and a gas inlet end and a gas outlet of, the desulfurization reaction tank, the aeration tank, the sedimentation tank, the clear liquid tank and the clear water tank are arranged in parallel, and the sodium alkali tank and the stirring structure are arranged on one side of the clear water tank in parallel.
As a further aspect of the present invention: and a guide pipe is connected between the bottom of the desulfurizing tower and the top of the desulfurizing reaction tank.
As a further aspect of the present invention: and the top side of the clear liquid pool is provided with two pumps in parallel, and the water inlet end parts and the water discharge end parts of the two pumps are respectively connected with the clear liquid pool and the middle part of the desulfurizing tower through guide pipes.
As a further aspect of the present invention: the top side of the clean water tank is provided with two pump machines in parallel, and the water inlet end parts and the water discharge end parts of the two pump machines are respectively connected with the clean water tank and the top of the desulfurizing tower through guide pipes.
As a further aspect of the present invention: the stirring structure is the mechanism of calcium hydrate stirring slurrying, the stirring structure includes agitator tank, air discharge fan, water tank, aeration pipe, stirring leaf, agitator motor and "S" blast pipe, agitator motor passes through the bolt cooperation and installs the bottom side central point at the agitator tank and puts, the output tip at agitator motor is installed to the stirring leaf, aeration pipe one end tip level sets up in the inner wall bottom of agitator tank, the water tank sets up in outer wall one side of agitator tank, the air discharge fan sets up between agitator tank and water tank, the inside at the water tank is established to "S" blast pipe support, the both sides of air discharge fan are connected with agitator tank and "S" blast pipe respectively under the cooperation of air hopper respectively.
As a further aspect of the present invention: and a pump machine is arranged on one side of the sodium alkali cylinder, and the water inlet end part and the water discharge end of the pump machine are respectively connected with the clear liquid pool and the top of the sodium alkali cylinder through guide pipes.
As a further aspect of the present invention: and a pump machine is arranged on one side of the stirring cylinder, and the water inlet end part and the water discharge end of the pump machine are respectively connected with the stirring cylinder and the top of the desulfurization reaction tank through a guide pipe.
The utility model has the advantages that: selective catalytic reduction denitration (SCR) is to generate pollution-free nitrogen by taking ammonia as a reducing agent and nitrogen oxides (including nitric oxide and nitrogen dioxide) under the catalytic action of a catalyst, and no waste liquid (relatively pure water) is generated in the process; the absorption liquid used for the reverse wet-process empty tower spray desulfurization by the sodium-calcium double-alkali method is sodium-calcium double-alkali, the absorption of sulfur dioxide is relatively thorough, the alkali liquor can be regenerated and recycled, and the waste liquid amount is small; the comprehensive results show that the desulfurization and denitrification process for treating the diketene cracking tail gas has the advantages of less waste liquid amount, standard tail gas emission, low sewage treatment cost and product cost reduction.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is the overall reaction scheme of the present invention;
FIG. 2 is a perspective view of the stirring structure of the present invention;
FIG. 3 is an internal structure diagram of the stirring structure of the present invention;
In the figure: 1. a liquid ammonia water storage tank; 2. a pump machine; 3. a denitration reactor; 4. an air cooler; 5. a water cooler; 6. a pulse type dust remover; 7. an induced draft fan; 8. a desulfurization reaction tank; 9. an aeration tank; 10. a sedimentation tank; 11. a clear liquid pool; 12. a clean water tank; 13. a sodium alkali cylinder; 14. a stirring structure; 15. a desulfurizing tower; 141. a mixing tank; 142. an exhaust fan; 143. a water tank; 144. an aeration pipe; 145. stirring blades; 146. a stirring motor; 147. an "S" exhaust pipe.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-3, a desulfurization and denitrification apparatus for treating diketene cracking tail gas comprises a liquid ammonia water storage tank 1, a pump machine 2, a denitrification reactor 3, an air cooler 4, a water cooler 5, a pulse type dust remover 6, an induced draft fan 7, a desulfurization reaction tank 8, an aeration tank 9, a sedimentation tank 10, a clear liquid tank 11, a clear water tank 12, a soda tank 13, a stirring structure 14 and a desulfurization tower 15, wherein a liquid outlet of the liquid ammonia water storage tank 1 is fixedly connected with a liquid inlet of the pump machine 2 through a liquid guide pipe, the denitrification reactor 3 is fixedly connected with a liquid discharge pipe of the pump machine 2 through a liquid guide pipe, the air cooler 4 and the water cooler 5 are arranged in parallel through a guide pipe, a material outlet of the denitrification reactor 3 is fixedly connected with a material inlet of the air cooler 4 through a guide pipe, a material inlet of the pulse type dust remover 6 is fixedly connected with a material outlet of the water cooler 5 through a guide pipe, the, an air inlet end and an air outlet end of the induced draft fan 7 are respectively connected with the pulse type dust collector 6 and the desulfurizing tower 15, the desulfurizing reaction tank 8, the aeration tank 9, the sedimentation tank 10, the clear liquid tank 11 and the clean water tank 12 are arranged in parallel, and the soda tank 13 and the stirring structure 14 are arranged on one side of the clean water tank 12 in parallel;
A conduit is connected between the bottom of the desulfurizing tower 15 and the top of the desulfurizing reaction tank 8;
The top side of the clear liquid pool 11 is provided with two pumps 2 in parallel, and the water inlet end parts and the water outlet end parts of the two pumps 2 are respectively connected with the clear liquid pool 11 and the middle part of the desulfurizing tower 15 through guide pipes;
The top side of the clean water tank 12 is provided with two pump machines 2 in parallel, and the water inlet end parts and the water outlet end parts of the two pump machines 2 are respectively connected with the top parts of the clean water tank 12 and the desulfurizing tower 15 through guide pipes;
The stirring structure 14 is a mechanism for stirring and pulping calcium hydroxide, the stirring structure 14 comprises a stirring cylinder 141, an exhaust fan 142, a water tank 143, an aeration pipe 144, a stirring blade 145, a stirring motor 146 and an "S" exhaust pipe 147, the stirring motor 146 is installed at the center position of the bottom side of the stirring cylinder 141 through bolt fitting, the stirring blade 145 is installed at the output end part of the stirring motor 146, one end part of the aeration pipe 144 is horizontally arranged at the bottom of the inner wall of the stirring cylinder 141, the water tank 143 is arranged at one side of the outer wall of the stirring cylinder 141, the exhaust fan 142 is arranged between the stirring cylinder 141 and the water tank 143, the "S" exhaust pipe 147 is erected inside the water tank 143, and two sides of the exhaust fan 142 are respectively connected with the stirring cylinder 141 and the "S" exhaust pipe 147;
A pump machine 2 is arranged on one side of the sodium alkali cylinder 13, and the water inlet end part and the water outlet end part of the pump machine 2 are respectively connected with the top parts of the clear liquid tank 11 and the sodium alkali cylinder 13 through guide pipes;
One side of the stirring cylinder 141 is provided with a pump 2, and the water inlet end and the water outlet end of the pump 2 are respectively connected with the stirring cylinder 141 and the top of the desulfurization reaction tank 8 through a conduit.
The utility model discloses a theory of operation: the desulfurization and denitrification process for treating the diketene cracking tail gas is actually named Selective Catalytic Reduction (SCR) and sodium-calcium double-alkali reverse wet method empty tower spraying desulfurization, wherein the SCR denitrification is a reaction that ammonia is used as a reducing agent to be injected into flue gas containing nitrogen oxide, and nitrogen oxides (including nitric oxide and nitrogen dioxide) are subjected to the following reaction under the catalysis of a catalyst:
4NO+4NH3+O2→4N2+6H2O
2NO2+4NH3+O2→3N2+6H2O
6NO2+8NH3→7N2+12H2O
2NH3+NO+NO2→2N2+3H2O
The operation principle of the reverse wet method empty tower spray desulfurization system by the sodium-calcium double alkali method is that SO 2Absorbed by sodium alkali solution to complete the desulfurization process, and the desulfurization reaction is as follows: NaOH + SO 2→Na2SO3+H2O，Na2SO3+SO2+H2O→2NaHSO3(ii) a Absorption of SO 2The later desulfurizing agent enters a regeneration reaction tank and is added into lime milk (Ca (OH) in the tank simultaneously 2) Carrying out regeneration reaction, wherein sodium alkali is regenerated, and the reaction in the regeneration process is as follows: NaHSO 3+Ca(OH)2→Na2SO3+CaSO3↓+ H2O，Na2SO3+Ca(OH)2→NaOH+CaSO3↓
The main operation process of the desulfurization and denitrification device for treating the diketene cracking tail gas is as follows:
Spraying ammonia water (reducing agent) into a tail gas pipeline by using compressed air, mixing, entering a denitration reactor 3 for selective catalytic reduction denitration reaction, cooling the denitrated tail gas by a heat exchanger, entering a pulse type dust remover 6 for removing smoke dust, boosting the pressure of the flue gas dedusted by the pulse type dust remover 6 by an induced draft fan 7, entering a desulfurizing tower 15 from the bottom through an inlet flue of the desulfurizing tower 15, ascending, colliding and contacting with a sodium-alkali solution (desulfurizer) sprayed from the middle of the tower in a countercurrent manner, and carrying out SO (sulfur dioxide) in the flue gas 2Absorbed by sodium alkali solution to complete the desulfurization process, the desulfurizer absorbing sulfur dioxide is discharged from the bottom of the desulfurizing tower 15, enters the desulfurization reaction tank 8, and is added with lime milk (Ca (OH) in the tank at the same time 2) Carrying out regeneration reaction, regenerating sodium base, and generating desulfurization product (CaSO) 3) Flows into the sedimentation tank 10 along with the desulfurizer to be sedimentated; the clarified desulfurization solution finally enters a clear solution tank 11, is added with a proper amount of alkali liquor (NaOH) to adjust the pH value, is pumped back to a desulfurization tower 15 by an external circulating pump to enter the next desulfurization process, lime milk does not directly react with sulfur dioxide, and reacts with sodium sulfite and sodium bisulfite to obtain regenerated sodium hydroxide and calcium sulfite precipitates which react with Ca (OH) 2The regeneration reaction, stirring motor 146 operation at this moment, drive stirring leaf 145 rotatory, realize the stirring of liquid, can be abundant guarantee liquid and gaseous reaction, can produce the heat simultaneously, steam passes through air discharge fan 142 operation, discharges the hot-air into "S" blast pipe 147, and when the exhaust gas, the water stand endothermal reaction in the water tank 143 is used for the power generation with the heat energy that the water in the water tank 143 carried to use, can reach energy reuse, energy-concerving and environment-protective.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A desulfurization and denitrification device for treating diketene cracking tail gas is characterized by comprising a liquid ammonia water storage tank (1), a pump machine (2), a denitrification reactor (3), an air cooler (4), a water cooler (5), a pulse type dust remover (6), an induced draft fan (7), a desulfurization reaction tank (8), an aeration tank (9), a sedimentation tank (10), a clear liquid tank (11), a clear water tank (12), a sodium alkali tank (13), a stirring structure (14) and a desulfurization tower (15), wherein a liquid outlet of the liquid ammonia water storage tank (1) is fixedly connected with a liquid inlet of the pump machine (2) through a liquid guide pipe, the denitrification reactor (3) is fixedly connected with a liquid discharge pipe of the pump machine (2) through a liquid guide pipe, the air cooler (4) and the water cooler (5) are arranged in parallel through a guide pipe, a material discharge port of the denitrification reactor (3) is fixedly connected with a material inlet of the air cooler (4) through a guide pipe, the feed inlet of pulse type dust remover (6) passes through pipe connection with the bin outlet of water cooler (5), draught fan (7) set up between pulse type dust remover (6) and desulfurizing tower (15), the inlet end and the exhaust end of draught fan (7) are connected with pulse type dust remover (6) and desulfurizing tower (15) respectively, desulfurization reaction tank (8), aeration tank (9), sedimentation tank (10), clear solution pond (11) and clean water basin (12) set up side by side, sodium alkali jar (13) set up the one side in clean water basin (12) with stirring structure (14) side by side.
2. The desulfurization and denitrification apparatus for processing diketene cracking tail gas according to claim 1, wherein a conduit is connected between the bottom of the desulfurization tower (15) and the top of the desulfurization reaction tank (8).
3. The desulfurization and denitrification device for treating diketene cracking tail gas according to claim 1, wherein two pumps (2) are arranged in parallel on the top side of the clear liquid tank (11), and the water inlet end parts and the water outlet end parts of the two pumps (2) are respectively connected with the middle parts of the clear liquid tank (11) and the desulfurization tower (15) through guide pipes.
4. The desulfurization and denitrification device for treating diketene cracking tail gas according to claim 1, wherein two pump units (2) are arranged in parallel on the top side of the clean water tank (12), and the water inlet end and the water outlet end of the two pump units (2) are respectively connected with the top of the clean water tank (12) and the top of the desulfurization tower (15) through a guide pipe.
5. The desulfurization and denitrification device for processing diketene cracking tail gas according to claim 1, wherein the stirring structure (14) is a mechanism for stirring and pulping calcium hydroxide, the stirring structure (14) comprises a stirring cylinder (141), an exhaust fan (142), a water tank (143), an aeration pipe (144), a stirring blade (145), a stirring motor (146) and an "S" exhaust pipe (147), the stirring motor (146) is installed at the center of the bottom side of the stirring cylinder (141) through a bolt in a matching manner, the stirring blade (145) is installed at the output end of the stirring motor (146), one end of the aeration pipe (144) is horizontally arranged at the bottom of the inner wall of the stirring cylinder (141), the water tank (143) is arranged at one side of the outer wall of the stirring cylinder (141), the exhaust fan (142) is arranged between the stirring cylinder (141) and the water tank (143), and the "S" exhaust pipe (147) is erected inside the water tank (143), and two sides of the exhaust fan (142) are respectively connected with the stirring cylinder (141) and the S exhaust pipe (147) under the matching of the air hopper.
6. The desulfurization and denitrification device for processing diketene cracking tail gas as claimed in claim 1, wherein a pump (2) is arranged on one side of the sodium alkali cylinder (13), and the water inlet end and the water outlet end of the pump (2) are respectively connected with the top of the clear liquid tank (11) and the top of the sodium alkali cylinder (13) through conduits.
7. The desulfurization and denitrification device for processing diketene cracking tail gas as claimed in claim 5, wherein a pump (2) is arranged on one side of the stirring cylinder (141), and the water inlet end and the water outlet end of the pump (2) are respectively connected with the stirring cylinder (141) and the top of the desulfurization reaction tank (8) through conduits.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922071598.4U CN211133513U (en) | 2019-11-27 | 2019-11-27 | Desulfurization and denitrification device for treating diketene cracking tail gas |
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| CN201922071598.4U CN211133513U (en) | 2019-11-27 | 2019-11-27 | Desulfurization and denitrification device for treating diketene cracking tail gas |
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| CN201922071598.4U Active CN211133513U (en) | 2019-11-27 | 2019-11-27 | Desulfurization and denitrification device for treating diketene cracking tail gas |
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