CN111003818A - Device and method for preventing waste sodium hypochlorite heater from scaling - Google Patents
Device and method for preventing waste sodium hypochlorite heater from scaling Download PDFInfo
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- CN111003818A CN111003818A CN201911295748.8A CN201911295748A CN111003818A CN 111003818 A CN111003818 A CN 111003818A CN 201911295748 A CN201911295748 A CN 201911295748A CN 111003818 A CN111003818 A CN 111003818A
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- sodium hypochlorite
- waste sodium
- hypochlorite solution
- acetylene
- inlet
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- 239000005708 Sodium hypochlorite Substances 0.000 title claims abstract description 304
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 title claims abstract description 304
- 239000002699 waste material Substances 0.000 title claims abstract description 298
- 238000000034 method Methods 0.000 title claims abstract description 37
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims abstract description 192
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims abstract description 188
- 238000007872 degassing Methods 0.000 claims abstract description 73
- 239000003513 alkali Substances 0.000 claims abstract description 50
- 239000000872 buffer Substances 0.000 claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 239000007921 spray Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000004148 unit process Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 64
- 238000004064 recycling Methods 0.000 claims description 25
- 239000002351 wastewater Substances 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 8
- 239000005997 Calcium carbide Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000003786 synthesis reaction Methods 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 137
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Natural products P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- PGYDGBCATBINCB-UHFFFAOYSA-N 4-diethoxyphosphoryl-n,n-dimethylaniline Chemical compound CCOP(=O)(OCC)C1=CC=C(N(C)C)C=C1 PGYDGBCATBINCB-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 239000006009 Calcium phosphide Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 206010057175 Mass conditions Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000011354 acetal resin Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- -1 calcium carbides Chemical class 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 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
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229920006163 vinyl copolymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a device and a method for preventing a waste sodium hypochlorite heater from scaling, wherein the device is provided with a waste sodium hypochlorite buffer tank, a waste sodium hypochlorite heater, a degassing tower, a cooler, a waste sodium hypochlorite collecting pool, a spray cooling tower and an alkali tank, and the waste sodium hypochlorite solution after acetylene gas cleaning is treated and recycled through four unit processes of pretreatment of the waste sodium hypochlorite solution, waste sodium hypochlorite degassing, acetylene gas cooling and waste sodium hypochlorite solution post-treatment. The device and the method can effectively relieve the problem of scaling and blockage of the waste sodium hypochlorite heater equipment and the conveying pipeline, prolong the service life of the equipment and ensure safe production.
Description
Technical Field
The invention relates to a device and a method for preventing a waste sodium hypochlorite heater from scaling in a vinyl acetate production process.
Background
Vinyl acetate is one of organic chemical raw materials with large world output, is widely used for producing a series of chemical and chemical fiber products such as polyvinyl acetate (PVAc), polyvinyl alcohol, paint, slurry, adhesive, vinylon, film, vinyl copolymer resin, acetal resin and the like, and is applied to various industries.
The production process routes of vinyl acetate include an ethylene method and an acetylene method, and the calcium carbide acetylene method is mainly used in China. In the process of a calcium carbide method vinyl acetate production process, in order to avoid the poisoning of a synthetic catalyst, a sodium hypochlorite solution with 0.085-0.12% of available chlorine is needed to remove impurity gases such as hydrogen sulfide, phosphine and the like contained in crude acetylene, according to the mass condition of most calcium carbides in China, the volume ratio of the consumption of the sodium hypochlorite solution in an acetylene cleaning process to the quantity of the cleaned acetylene is about 1:140, and a set of 10 ten thousand tons/year PVA device needs 25m of the sodium hypochlorite solution with 0.085-0.12% of available chlorine per hour3. And (3) discharging a waste sodium hypochlorite solution (waste sodium hypochlorite solution for short) generated after the treatment of the synthesis process into a waste sodium hypochlorite buffer tank, introducing the waste sodium hypochlorite solution into a heater through a pipeline for heating, removing acetylene gas and the like, and finally sending the waste sodium hypochlorite solution to a waste sodium hypochlorite preparation system for secondary mixing and compounding for recycling. Because the raw material calcium carbide contains a small amount of impurities of calcium phosphide and calcium sulfide, in the process of adding water into the calcium carbide to produce acetylene gas, the impurities also undergo chemical reaction with the water to produce Ca (OH)2. And in order to ensure that the compound water is alkalescent, a certain amount of alkali is added into the waste sodium hypochlorite buffer tank, sodium hydroxide reacts with carbon dioxide dissolved in the clean wastewater to generate sodium carbonate, and calcium ions in the calcium hydroxide react with carbonate ions in the sodium carbonate to generate CaCO3When the sediment is generated, the feed line of the buffer tank to the heater is blockedAlso, fouling of the heater can result. If the process control is not reasonable, or the carbon dioxide dissolved in the clean wastewater is excessive, the carbon dioxide and the generated sodium carbonate generate sodium bicarbonate, and white substances are separated out when the sodium bicarbonate and the sodium carbonate reach a saturated solution, so that crystallization is caused, and the tower and the pipeline are possibly blocked. The maintenance of the blockage wastes a large amount of manpower and material resources.
Disclosure of Invention
The invention aims to provide a device and a method for preventing a waste sodium hypochlorite heater from scaling, so as to ensure that sodium hypochlorite conveying equipment and pipelines are smooth in the production process of vinyl acetate, ensure the safety of alkalescent re-distributed water, greatly save manpower and material resources and ensure safe production.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention firstly discloses a device for preventing a waste sodium hypochlorite heater from scaling, which is characterized in that: the device comprises a waste sodium hypochlorite buffer tank, a delivery pump, a waste sodium hypochlorite heater, a degassing tower, a No. 1 acetylene cooler, a No. 2 acetylene cooler, a waste sodium hypochlorite collecting tank, a spray cooling tower, an alkali tank, a high-salinity wastewater pump, a waste sodium hypochlorite recycling pump and a vacuum pump;
the lower part of the waste sodium hypochlorite buffer tank is provided with a buffer tank waste sodium hypochlorite solution inlet and a buffer tank waste sodium hypochlorite solution outlet, and the middle upper part of the buffer tank is provided with a buffer tank recycled waste sodium hypochlorite solution inlet; the delivery pump is provided with a delivery pump inlet and a delivery pump outlet; a heater waste sodium hypochlorite solution inlet is formed in the lower part of the waste sodium hypochlorite heater, a heater waste sodium hypochlorite solution outlet is formed in the upper part of the waste sodium hypochlorite heater, and a steam inlet and a steam condensate outlet are formed in the middle of the waste sodium hypochlorite heater; a waste sodium hypochlorite solution inlet of the degassing tower is arranged at the middle upper part of the degassing tower, a waste sodium hypochlorite solution outlet of the degassing tower is arranged at the lower part of the degassing tower, and an acetylene gas outlet and a nitrogen flushing inlet of the degassing tower are arranged at the upper part of the degassing tower; the upper part of the 1# acetylene cooler is provided with a 1# acetylene cooler acetylene gas inlet, the lower part of the 1# acetylene cooler is provided with a 1# acetylene cooler waste sodium hypochlorite solution outlet and a 1# acetylene cooler acetylene gas outlet, and the middle part of the 1# acetylene cooler is provided with a low-temperature water inlet and a low-temperature water outlet; the upper part of the No. 2 acetylene cooler is provided with a No. 2 acetylene cooler acetylene gas inlet, the lower part of the No. 2 acetylene cooler is provided with a No. 2 acetylene cooler waste sodium hypochlorite solution outlet and a No. 2 acetylene cooler acetylene gas outlet, and the middle part of the No. 2 acetylene cooler is provided with a chilled water inlet and a chilled water outlet; a collecting tank waste sodium hypochlorite solution inlet and a collecting tank alkali liquor inlet are arranged at the upper part of the waste sodium hypochlorite collecting tank, and a collecting tank waste sodium hypochlorite solution outlet is arranged at the lower part of the waste sodium hypochlorite collecting tank; a cooling tower waste sodium hypochlorite solution inlet and a cooling tower waste sodium hypochlorite solution outlet are formed in the lower part of the spray cooling tower; an alkali liquor inlet is arranged at the upper part of the alkali tank, and an alkali liquor outlet is arranged at the lower part of the alkali tank; a wastewater pump inlet and a wastewater pump outlet are arranged on the high-salinity wastewater pump; a recycling pump inlet and a recycling pump outlet are arranged on the waste sodium hypochlorite recycling pump; the vacuum pump is provided with a vacuum pump inlet and a vacuum pump outlet;
the waste sodium hypochlorite solution outlet of the buffer tank is connected with the inlet of the delivery pump; the outlet of the delivery pump is connected with the waste sodium hypochlorite solution inlet of the heater; the waste sodium hypochlorite solution outlet of the heater is connected with the waste sodium hypochlorite solution inlet of the degassing tower; the waste sodium hypochlorite solution outlet of the degassing tower is connected with the waste sodium hypochlorite solution inlet of the collecting tank; the acetylene gas outlet of the degassing tower is connected with the acetylene gas inlet of the No. 1 acetylene cooler; the acetylene gas outlet of the 1# acetylene cooler is connected with the acetylene gas inlet of the 2# acetylene cooler; the No. 1 acetylene cooler waste sodium hypochlorite solution outlet and the No. 2 acetylene cooler waste sodium hypochlorite solution outlet are connected in parallel on the same delivery pipeline and connected with the buffer tank recycled waste sodium hypochlorite solution inlet; the 2# acetylene cooler acetylene gas outlet is connected with the vacuum pump inlet; the alkali liquor inlet of the collecting tank is connected with the alkali liquor outlet; the collecting tank waste sodium hypochlorite solution outlet is connected with the cooling tower waste sodium hypochlorite solution inlet; the waste sodium hypochlorite solution outlet of the cooling tower is simultaneously connected with the wastewater pump inlet and the recycling pump inlet; the alkali liquor inlet is connected with an alkali liquor configuration system.
The invention also discloses a method for preventing the waste sodium hypochlorite heater from scaling, which is carried out by utilizing the device and comprises four unit processes of pretreatment of the waste sodium hypochlorite solution, waste sodium hypochlorite degassing, acetylene gas cooling and waste sodium hypochlorite solution post-treatment, and the method comprises the following specific steps:
(1) pretreatment of waste sodium hypochlorite solution
Adding a waste sodium hypochlorite solution generated in a synthesis process of a calcium carbide acetylene process in the production process of vinyl acetate into a waste sodium hypochlorite buffer tank from a waste sodium hypochlorite solution inlet of the buffer tank for storage, and buffering the subsequent steps; the waste sodium hypochlorite solution in the waste sodium hypochlorite buffer tank is added into a waste sodium hypochlorite heater from a waste sodium hypochlorite solution inlet of the heater through a delivery pump; introducing steam into the waste sodium hypochlorite heater from a steam inlet, carrying out non-contact heat exchange with a waste sodium hypochlorite solution, and sending out steam condensate generated after heat exchange from a steam condensate outlet;
(2) degassing of waste sodium hypochlorite
Adding the waste sodium hypochlorite solution subjected to heat exchange treatment by the waste sodium hypochlorite heater into a degassing tower from a waste sodium hypochlorite solution inlet of the degassing tower, and degassing; in a degassing tower keeping a certain vacuum degree, the waste sodium hypochlorite solution boils to generate a large amount of water vapor, and most of the dissolved acetylene is released from the waste sodium hypochlorite solution continuously due to the disturbance of the water vapor; most of released acetylene gas is sent into a No. 1 acetylene cooler from an acetylene gas outlet of a degassing tower for cooling treatment; discharging the waste sodium hypochlorite solution subjected to degassing treatment into a waste sodium hypochlorite collecting tank from a waste sodium hypochlorite solution outlet of a degassing tower;
(3) acetylene gas cooling
Most of acetylene gas released in the step (2) is sent into a No. 1 acetylene cooler from an acetylene gas inlet of the No. 1 acetylene cooler, non-contact heat exchange is carried out between the acetylene gas and low-temperature water added from a low-temperature water inlet, a large amount of water vapor in the acetylene gas is removed, and the low-temperature water after heat exchange is sent out from a low-temperature water outlet;
acetylene gas cooled by the 1# acetylene cooler is sent into the 2# acetylene cooler from an acetylene gas inlet of the 2# acetylene cooler, and carries out non-contact heat exchange with chilled water added from a chilled water inlet, and the chilled water after heat exchange is sent out from a chilled water outlet;
acetylene gas cooled by the No. 2 acetylene cooler is pressurized by a vacuum pump and then is sent to an acetylene main pipe before the cleaning process of acetylene synthesis for use;
liquid cooled by the 1# acetylene cooler and the 2# acetylene cooler is respectively sent to a waste sodium hypochlorite buffer tank for recycling through a waste sodium hypochlorite solution outlet of the 1# acetylene cooler and a waste sodium hypochlorite solution outlet of the 2# acetylene cooler;
(4) post-treatment of waste sodium hypochlorite solution
The waste sodium hypochlorite solution after degassing treatment is discharged into a waste sodium hypochlorite collecting tank from a waste sodium hypochlorite solution outlet of a degassing tower through a waste sodium hypochlorite solution inlet of a collecting tank, and a waste sodium hypochlorite solution inlet pipeline of the collecting tank extends into the position below the liquid level of a waste sodium hypochlorite collecting tank to play a role of safe liquid seal; adding alkali liquor in an alkali liquor tank into the waste sodium hypochlorite collecting tank from an alkali liquor outlet through an alkali liquor inlet of the collecting tank, and mixing the alkali liquor with the waste sodium hypochlorite solution to make the alkali liquor in the waste sodium hypochlorite collecting tank in a weakly alkaline state;
adding the alkalescent sodium hypochlorite waste solution in the sodium hypochlorite waste collecting pool into a spray cooling tower through a sodium hypochlorite waste solution inlet of the cooling tower, and cooling and aerating to further reduce the acetylene gas content in the solution;
the treated waste sodium hypochlorite solution is sent out from a waste sodium hypochlorite solution outlet of the cooling tower, the waste sodium hypochlorite solution accounting for 90 percent of the total volume is sent to a waste sodium hypochlorite preparation system by a waste sodium hypochlorite recycling pump for secondary mixing and compounding for use (the preparation safety can be improved by secondary mixing and compounding), and the rest of the waste sodium hypochlorite solution is sent to a sewage treatment device by a high-salinity wastewater pump (the over-high accumulation of sulfur and phosphorus in the waste sodium hypochlorite can be avoided).
Further, in the step (1), the temperature of the waste sodium hypochlorite solution outlet (3b) of the heater is controlled to be 40-60 ℃;
further, in the step (2), the pressure of the degassing tower is controlled to be between- (50 and 70) KPa.
Further, in the step (3), the temperature of the low-temperature water is 15-25 ℃, and the temperature of the chilled water is-7-0 ℃.
Further, in the step (4), the pH value of the liquid in the waste sodium hypochlorite collecting tank is 7-9.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the device and the method, the alkali liquor is added into the waste sodium hypochlorite collecting pool, so that the scaling and blockage of a pipeline from the waste sodium hypochlorite buffer tank to a vacuum pump in the material conveying process can be effectively relieved, the scaling and blockage of a waste sodium hypochlorite heater can be effectively relieved, the service cycle of a matching device is effectively prolonged, the consumption of materials in acid washing is reduced, the labor intensity of field personnel is relieved, and the device and the method have better economic benefits.
2. The device and the method can ensure the safety of weak alkalescence of the compound water.
Drawings
FIG. 1 is a schematic diagram of the apparatus for preventing scale formation of a waste sodium hypochlorite heater according to the present invention, wherein the reference numbers:
1 is a waste sodium hypochlorite buffer tank, 2 is a delivery pump, 3 is a waste sodium hypochlorite heater, 4 is a degassing tower, 5 is a # 1 acetylene cooler, 6 is a # 2 acetylene cooler, 7 is a waste sodium hypochlorite collecting tank, 8 is a spray cooling tower, 9 is an alkali tank, 10 is a high-salt wastewater pump, 11 is a waste sodium hypochlorite recycling pump, and 12 is a vacuum pump;
1a is a buffer tank waste sodium hypochlorite solution inlet, 1b is a buffer tank waste sodium hypochlorite solution outlet, 1c is a buffer tank recycled waste sodium hypochlorite solution inlet, 2a is a delivery pump inlet, 2b is a delivery pump outlet, 3a is a heater waste sodium hypochlorite solution inlet, 3b is a heater waste sodium hypochlorite solution outlet, 3c is a steam inlet, 3d is a steam condensate outlet, 4a is a degassing tower waste sodium hypochlorite solution inlet, 4b is a degassing tower waste sodium hypochlorite solution outlet, 4c is a degassing tower acetylene gas outlet, 4d is a nitrogen gas flushing inlet, 5a is a 1# acetylene cooler acetylene gas inlet, 5b is a 1# acetylene cooler waste sodium hypochlorite solution outlet, 5c is a 1# acetylene cooler acetylene gas outlet, 5d is a low-temperature water inlet, 5e is a low-temperature water outlet, 6a is a 2# acetylene cooler acetylene gas inlet, and 6b is a 2# acetylene cooler waste sodium hypochlorite solution outlet, 6c is an acetylene gas outlet of a 2# acetylene cooler, 6d is a chilled water inlet, 6e is a chilled water outlet, 7a is a waste sodium hypochlorite solution inlet of a collecting pool, 7b is an alkali liquor inlet of the collecting pool, 7c is a waste sodium hypochlorite solution outlet of the collecting pool, 8a is a waste sodium hypochlorite solution inlet of a cooling tower, 8b is a waste sodium hypochlorite solution outlet of the cooling tower, 9a is an alkali liquor inlet, 9b is an alkali liquor outlet, 10a is a waste water pump inlet, 10b is a waste water pump outlet, 11a is a recycling pump inlet, 11b is a recycling pump outlet, 12a is a vacuum pump inlet, and 12b is a vacuum pump outlet;
a represents waste sodium hypochlorite solution, B represents steam, C represents steam condensate, and D represents N2E represents low-temperature water, F represents chilled water, G represents an acetylene main pipe, H represents an alkali liquor preparation system, I represents a sodium hypochlorite preparation system, and J represents sewageAnd a processing device.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the drawings, and the embodiments are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and the specific operation procedures are provided, but the protection scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, in the present embodiment, first, a device for preventing the scale formation of the waste sodium hypochlorite heater is provided, which includes a waste sodium hypochlorite buffer tank 1, a delivery pump 2, a waste sodium hypochlorite heater 3, a degassing tower 4, a 1# acetylene cooler 5, a 2# acetylene cooler 6, a waste sodium hypochlorite collecting tank 7, a spray cooling tower 8, an alkali tank 9, a high-salt wastewater pump 10, a waste sodium hypochlorite recycling pump 11, and a vacuum pump 12.
A buffer tank waste sodium hypochlorite solution inlet 1a and a buffer tank waste sodium hypochlorite solution outlet 1b are arranged at the lower part of the waste sodium hypochlorite buffer tank 1, and a buffer tank recycled waste sodium hypochlorite solution inlet 1c is arranged at the middle upper part; the delivery pump 2 is provided with a delivery pump inlet 2a and a delivery pump outlet 2 b; a heater waste sodium hypochlorite solution inlet 3a is arranged at the lower part of the waste sodium hypochlorite heater 3, a heater waste sodium hypochlorite solution outlet 3b is arranged at the upper part of the waste sodium hypochlorite heater 3, and a steam inlet 3c and a steam condensate outlet 3d are arranged at the middle part of the waste sodium hypochlorite heater; a waste sodium hypochlorite solution inlet 4a of the degassing tower is arranged at the middle upper part of the degassing tower 4, a waste sodium hypochlorite solution outlet 4b of the degassing tower is arranged at the lower part of the degassing tower 4, and an acetylene gas outlet 4c and a nitrogen flushing inlet 4d of the degassing tower are arranged at the upper part of the degassing tower; the upper part of the 1# acetylene cooler 5 is provided with a 1# acetylene cooler acetylene gas inlet 5a, the lower part is provided with a 1# acetylene cooler waste sodium hypochlorite solution outlet 5b and a 1# acetylene cooler acetylene gas outlet 5c, and the middle part is provided with a low-temperature water inlet 5d and a low-temperature water outlet 5 e; the upper part of the No. 2 acetylene cooler 6 is provided with a No. 2 acetylene cooler acetylene gas inlet 6a, the lower part is provided with a No. 2 acetylene cooler waste sodium hypochlorite solution outlet 6b and a No. 2 acetylene cooler acetylene gas outlet 6c, and the middle part is provided with a chilled water inlet 6d and a chilled water outlet 6 e; a collecting tank waste sodium hypochlorite solution inlet 7a and a collecting tank alkali liquor inlet 7b are arranged at the upper part of the waste sodium hypochlorite collecting tank 7, and a collecting tank waste sodium hypochlorite solution outlet 7c is arranged at the lower part of the waste sodium hypochlorite collecting tank 7; a cooling tower waste sodium hypochlorite solution inlet 8a and a cooling tower waste sodium hypochlorite solution outlet 8b are arranged at the lower part of the spray cooling tower 8; the upper part of the alkali tank 9 is provided with an alkali liquor inlet 9a, and the lower part is provided with an alkali liquor outlet 9 b; a wastewater pump inlet 10a and a wastewater pump outlet 10b are arranged on the high-salinity wastewater pump 10; a recycling pump inlet 11a and a recycling pump outlet 11b are arranged on the waste sodium hypochlorite recycling pump 11; a vacuum pump inlet 12a and a vacuum pump outlet 12b are arranged on the vacuum pump 12;
the waste sodium hypochlorite solution outlet 1b of the buffer tank is connected with the inlet 2a of the delivery pump; the outlet 2b of the delivery pump is connected with the inlet 3a of the waste sodium hypochlorite solution of the heater; a waste sodium hypochlorite solution outlet 3b of the heater is connected with a waste sodium hypochlorite solution inlet 4a of the degassing tower; a waste sodium hypochlorite solution outlet 4b of the degassing tower is connected with a waste sodium hypochlorite solution inlet 7a of the collecting pool; an acetylene gas outlet 4c of the degassing tower is connected with an acetylene gas inlet 5a of a # 1 acetylene cooler; the 1# acetylene cooler acetylene gas outlet 5c is connected with the 2# acetylene cooler acetylene gas inlet 6 a; a waste sodium hypochlorite solution outlet 5b of the No. 1 acetylene cooler and a waste sodium hypochlorite solution outlet 6b of the No. 2 acetylene cooler are connected in parallel on the same delivery pipeline and connected with a recycled waste sodium hypochlorite solution inlet 1c of the buffer tank; an acetylene gas outlet 6c of the No. 2 acetylene cooler is connected with an inlet 12a of a vacuum pump; the alkali liquor inlet 7b of the collecting tank is connected with the alkali liquor outlet 9 b; a collecting tank waste sodium hypochlorite solution outlet 7c is connected with a cooling tower waste sodium hypochlorite solution inlet 8 a; the waste sodium hypochlorite solution outlet 8b of the cooling tower is simultaneously connected with a waste water pump inlet 10a and a recycling pump inlet 11 a; the lye inlet 9a is connected with the lye configuration system H.
In the specific implementation, the waste sodium hypochlorite heater 3 is of a tube type structure, and waste sodium hypochlorite solutions and steam with different temperatures are introduced into and out of the tube to exchange heat, so that the effect of heating the waste sodium hypochlorite solution is achieved.
In specific implementation, the degassing tower 4 is used for removing dissolved acetylene gas from the waste sodium hypochlorite solution, a certain vacuum degree is always kept in the tower, the waste sodium hypochlorite is boiled to generate a large amount of water vapor, and the acetylene dissolved in the waste sodium hypochlorite solution is continuously released from the waste sodium hypochlorite solution under the interference of the water vapor, so that the important function of recovering the acetylene gas is played. Because acetylene gas is flammable and explosive, the upper part of the degassing tower 4 is provided with a nitrogen flushing inlet.
The method for preventing the waste sodium hypochlorite heater from scaling in the embodiment utilizes the device and comprises the following steps:
step 1, pretreatment of waste sodium hypochlorite solution
Adding a waste sodium hypochlorite solution A generated in a synthesis process of a calcium carbide acetylene process in the production process of vinyl acetate into a waste sodium hypochlorite buffer tank 1 from a waste sodium hypochlorite solution inlet 1a of the buffer tank for storage, and buffering the subsequent steps; the waste sodium hypochlorite solution in the waste sodium hypochlorite buffer tank 1 is added into a waste sodium hypochlorite heater 3 from a waste sodium hypochlorite solution inlet 3a of the heater through a delivery pump 2; steam B from the system is introduced into the sodium hypochlorite waste heater 3 from a steam inlet 3C, non-contact heat exchange is carried out between the steam B and a sodium hypochlorite waste solution, and steam condensate C generated after heat exchange is sent out from a steam condensate outlet 3 d;
the temperature of the waste sodium hypochlorite solution outlet 3b of the heater is controlled to be 40-60 ℃.
Step 2, degassing waste sodium hypochlorite
Adding the waste sodium hypochlorite solution subjected to heat exchange treatment by the waste sodium hypochlorite heater 3 into a degassing tower 4 from a waste sodium hypochlorite solution inlet 4a of the degassing tower for degassing treatment; in a degassing tower keeping a certain vacuum degree, the waste sodium hypochlorite solution boils to generate a large amount of water vapor, and most of the dissolved acetylene is released from the waste sodium hypochlorite solution continuously due to the disturbance of the water vapor; most of released acetylene gas is sent into a No. 1 acetylene cooler 5 from an acetylene gas outlet 4c of the degassing tower for cooling treatment; the waste sodium hypochlorite solution after the degassing treatment is discharged into a waste sodium hypochlorite collecting tank 7 from a waste sodium hypochlorite solution outlet 4b of the degassing tower;
the pressure of the degassing tower is controlled to be between 50 and 70 KPa.
Step 3, acetylene gas cooling
Most of acetylene gas released in the step (2) is sent into a No. 1 acetylene cooler 5 from an acetylene gas inlet of the No. 1 acetylene cooler, and is subjected to non-contact heat exchange with low-temperature water E added from a low-temperature water inlet 5d to remove a large amount of water vapor in the acetylene gas, and the low-temperature water after heat exchange is sent out from a low-temperature water outlet 5E;
acetylene gas cooled by the 1# acetylene cooler 5 is sent into the 2# acetylene cooler 6 from the 2# acetylene cooler acetylene gas inlet 6a, and carries out non-contact heat exchange with the chilled water F added from the chilled water inlet 6d, and the chilled water after heat exchange is sent out from the chilled water outlet 6 e;
acetylene gas cooled by the 2# acetylene cooler 6 is pressurized by a vacuum pump 12 and then is sent to an acetylene main pipe G before the working procedure of acetylene synthesis and purification;
the liquid cooled by the 1# acetylene cooler 5 and the 2# acetylene cooler 6 is respectively sent to the waste sodium hypochlorite buffer tank 1 through a waste sodium hypochlorite solution outlet 5b of the 1# acetylene cooler and a waste sodium hypochlorite solution outlet 6b of the 2# acetylene cooler for recycling;
wherein the temperature of the low-temperature water is 15-25 ℃, and the temperature of the chilled water is-7-0 ℃.
The waste sodium hypochlorite solution after degassing treatment is discharged into a waste sodium hypochlorite collecting tank 7 from a waste sodium hypochlorite solution outlet 4b of a degassing tower through a waste sodium hypochlorite solution inlet 7a of a collecting tank, and a pipeline of the waste sodium hypochlorite solution inlet 7a of the collecting tank extends into the position below the liquid level of the waste sodium hypochlorite collecting tank to play a role of safe liquid seal; adding the alkali liquor in the alkali tank 9 into the sodium hypochlorite waste collecting tank 7 from an alkali liquor outlet 9b through an alkali liquor inlet 7b of the collecting tank, and mixing the alkali liquor with the sodium hypochlorite waste solution to make the sodium hypochlorite waste solution alkalescent (the pH value is 7-9);
the alkalescent sodium hypochlorite solution in the sodium hypochlorite waste collecting tank 7 is added into a spray cooling tower 8 through a sodium hypochlorite waste solution inlet 8a of the cooling tower for cooling and aeration, so that the acetylene gas content in the solution is further reduced;
the treated waste sodium hypochlorite solution is sent out from a waste sodium hypochlorite solution outlet 8b of the cooling tower, the waste sodium hypochlorite solution accounting for 90 percent of the total volume is sent to a waste sodium hypochlorite preparation system I by a waste sodium hypochlorite recycling pump 11 for secondary mixing and compounding, and the rest of the waste sodium hypochlorite solution is sent to a sewage treatment device J by a high-salinity wastewater pump 10.
Through the process treatment, the problem of scaling of the waste sodium hypochlorite solution heater is solved, and the influence on production caused by the blockage of equipment pipelines is avoided.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a prevent device of useless sodium hypochlorite heater scale deposit which characterized in that: the device comprises a waste sodium hypochlorite buffer tank (1), a delivery pump (2), a waste sodium hypochlorite heater (3), a degassing tower (4), a 1# acetylene cooler (5), a 2# acetylene cooler (6), a waste sodium hypochlorite collecting pool (7), a spray cooling tower (8), an alkali tank (9), a high-salinity wastewater pump (10), a waste sodium hypochlorite recycling pump (11) and a vacuum pump (12);
a buffer tank waste sodium hypochlorite solution inlet (1a) and a buffer tank waste sodium hypochlorite solution outlet (1b) are arranged at the lower part of the waste sodium hypochlorite buffer tank (1), and a buffer tank recycled waste sodium hypochlorite solution inlet (1c) is arranged at the middle upper part; a delivery pump inlet (2a) and a delivery pump outlet (2b) are arranged on the delivery pump (2); a heater waste sodium hypochlorite solution inlet (3a) is arranged at the lower part of the waste sodium hypochlorite heater (3), a heater waste sodium hypochlorite solution outlet (3b) is arranged at the upper part of the waste sodium hypochlorite heater, and a steam inlet (3c) and a steam condensate outlet (3d) are arranged at the middle part of the waste sodium hypochlorite heater; a waste sodium hypochlorite solution inlet (4a) of the degassing tower is arranged at the middle upper part of the degassing tower (4), a waste sodium hypochlorite solution outlet (4b) of the degassing tower is arranged at the lower part of the degassing tower, and an acetylene gas outlet (4c) and a nitrogen flushing inlet (4d) of the degassing tower are arranged at the upper part of the degassing tower; the upper part of the 1# acetylene cooler (5) is provided with a 1# acetylene cooler acetylene gas inlet (5a), the lower part of the 1# acetylene cooler is provided with a 1# acetylene cooler waste sodium hypochlorite solution outlet (5b) and a 1# acetylene cooler acetylene gas outlet (5c), and the middle part of the 1# acetylene cooler is provided with a low-temperature water inlet (5d) and a low-temperature water outlet (5 e); the upper part of the 2# acetylene cooler (6) is provided with a 2# acetylene cooler acetylene gas inlet (6a), the lower part of the 2# acetylene cooler is provided with a 2# acetylene cooler waste sodium hypochlorite solution outlet (6b) and a 2# acetylene cooler acetylene gas outlet (6c), and the middle part of the 2# acetylene cooler is provided with a chilled water inlet (6d) and a chilled water outlet (6 e); a collecting tank waste sodium hypochlorite solution inlet (7a) and a collecting tank alkali liquor inlet (7b) are arranged at the upper part of the waste sodium hypochlorite collecting tank (7), and a collecting tank waste sodium hypochlorite solution outlet (7c) is arranged at the lower part of the waste sodium hypochlorite collecting tank; a cooling tower waste sodium hypochlorite solution inlet (8a) and a cooling tower waste sodium hypochlorite solution outlet (8b) are arranged at the lower part of the spray cooling tower (8); an alkali liquor inlet (9a) is arranged at the upper part of the alkali tank (9), and an alkali liquor outlet (9b) is arranged at the lower part of the alkali tank; a wastewater pump inlet (10a) and a wastewater pump outlet (10b) are arranged on the high-salinity wastewater pump (10); a recycling pump inlet (11a) and a recycling pump outlet (11b) are arranged on the waste sodium hypochlorite recycling pump (11); a vacuum pump inlet (12a) and a vacuum pump outlet (12b) are arranged on the vacuum pump (12);
the waste sodium hypochlorite solution outlet (1b) of the buffer tank is connected with the outlet pump inlet (2 a); the outlet (2b) of the delivery pump is connected with the inlet (3a) of the waste sodium hypochlorite solution of the heater; the waste sodium hypochlorite solution outlet (3b) of the heater is connected with the waste sodium hypochlorite solution inlet (4a) of the degassing tower; the waste sodium hypochlorite solution outlet (4b) of the degassing tower is connected with the waste sodium hypochlorite solution inlet (7a) of the collecting pool; the degassing tower acetylene gas outlet (4c) is connected with the No. 1 acetylene cooler acetylene gas inlet (5 a); the 1# acetylene cooler acetylene gas outlet (5c) is connected with the 2# acetylene cooler acetylene gas inlet (6 a); the No. 1 acetylene cooler waste sodium hypochlorite solution outlet (5b) and the No. 2 acetylene cooler waste sodium hypochlorite solution outlet (6b) are connected in parallel on the same delivery pipeline and are connected with the buffer tank recycled waste sodium hypochlorite solution inlet (1 c); the 2# acetylene cooler acetylene gas outlet (6c) is connected with the vacuum pump inlet (12 a); the collection tank alkali liquor inlet (7b) is connected with the alkali liquor outlet (9 b); the collecting tank waste sodium hypochlorite solution outlet (7c) is connected with the cooling tower waste sodium hypochlorite solution inlet (8 a); the cooling tower waste sodium hypochlorite solution outlet (8b) is simultaneously connected with the wastewater pump inlet (10a) and the recycling pump inlet (11 a); the alkali liquor inlet (9a) is connected with an alkali liquor configuration system (H).
2. A method for preventing a waste sodium hypochlorite heater from scaling is characterized in that: the device of claim 1 is used for carrying out four unit processes including pretreatment of the waste sodium hypochlorite solution, waste sodium hypochlorite degassing, acetylene gas cooling and waste sodium hypochlorite solution post-treatment, and comprises the following specific steps:
(1) pretreatment of waste sodium hypochlorite solution
Adding a waste sodium hypochlorite solution (A) generated in a synthesis process of a calcium carbide acetylene process in the production process of vinyl acetate into a waste sodium hypochlorite buffer tank (1) from a waste sodium hypochlorite solution inlet (1a) of the buffer tank for storage, and buffering the subsequent steps; the waste sodium hypochlorite solution in the waste sodium hypochlorite buffer tank (1) is added into a waste sodium hypochlorite heater (3) from a waste sodium hypochlorite solution inlet (3a) of the heater through a delivery pump (2); introducing steam (B) into the waste sodium hypochlorite heater (3) through a steam inlet (3C), carrying out non-contact heat exchange with a waste sodium hypochlorite solution, and sending out steam condensate (C) generated after heat exchange through a steam condensate outlet (3 d);
(2) degassing of waste sodium hypochlorite
Adding the waste sodium hypochlorite solution subjected to heat exchange treatment by the waste sodium hypochlorite heater (3) into a degassing tower (4) from a waste sodium hypochlorite solution inlet (4a) of the degassing tower for degassing treatment; in a degassing tower keeping a certain vacuum degree, the waste sodium hypochlorite solution boils to generate a large amount of water vapor, and most of the dissolved acetylene is released from the waste sodium hypochlorite solution continuously due to the disturbance of the water vapor; most of released acetylene gas is sent into a No. 1 acetylene cooler (5) from an acetylene gas outlet (4c) of the degassing tower for cooling treatment; the waste sodium hypochlorite solution after the degassing treatment is discharged into a waste sodium hypochlorite collecting tank (7) from a waste sodium hypochlorite solution outlet (4b) of a degassing tower;
(3) acetylene gas cooling
Most of acetylene gas released in the step (2) is sent into a No. 1 acetylene cooler (5) from an acetylene gas inlet of the No. 1 acetylene cooler, non-contact heat exchange is carried out between the acetylene gas and low-temperature water (E) added from a low-temperature water inlet (5d), a large amount of water vapor in the acetylene gas is removed, and the low-temperature water after heat exchange is sent out from a low-temperature water outlet (5E);
acetylene gas cooled by the No. 1 acetylene cooler (5) is sent into the No. 2 acetylene cooler (6) from an acetylene gas inlet (6a) of the No. 2 acetylene cooler, and is subjected to non-contact heat exchange with chilled water (F) added from a chilled water inlet (6d), and the chilled water after heat exchange is sent out from a chilled water outlet (6 e);
acetylene gas cooled by the 2# acetylene cooler (6) is pressurized by a vacuum pump (12) and then is sent to an acetylene main pipe (G) before the working procedure of acetylene synthesis and purification;
the liquid cooled by the 1# acetylene cooler (5) and the 2# acetylene cooler (6) is respectively sent to a waste sodium hypochlorite buffer tank (1) through a waste sodium hypochlorite solution outlet (5b) of the 1# acetylene cooler and a waste sodium hypochlorite solution outlet (6b) of the 2# acetylene cooler for recycling;
(4) post-treatment of waste sodium hypochlorite solution
The waste sodium hypochlorite solution after degassing treatment is discharged into a waste sodium hypochlorite collecting tank (7) from a waste sodium hypochlorite solution outlet (4b) of a degassing tower through a waste sodium hypochlorite solution inlet (7a) of a collecting tank, and a pipeline of the waste sodium hypochlorite solution inlet (7a) of the collecting tank extends into the position below the liquid level of the waste sodium hypochlorite collecting tank to play a role of safe liquid sealing; alkali liquor in the alkali tank (9) is added into the waste sodium hypochlorite collecting tank (7) from an alkali liquor outlet (9b) through an alkali liquor inlet (7b) of the collecting tank, and is mixed with the waste sodium hypochlorite solution to make the waste sodium hypochlorite solution alkalescent;
weakly alkaline waste sodium hypochlorite solution in the waste sodium hypochlorite collecting tank (7) is added into a spray cooling tower (8) through a waste sodium hypochlorite solution inlet (8a) of the cooling tower for cooling and aeration, so that the acetylene gas content in the solution is further reduced;
the treated waste sodium hypochlorite solution is sent out from a waste sodium hypochlorite solution outlet (8b) of the cooling tower, the waste sodium hypochlorite solution accounting for 90 percent of the total volume is sent to a waste sodium hypochlorite preparation system (I) through a waste sodium hypochlorite recycling pump (11) for secondary mixing and compounding, and the rest of the waste sodium hypochlorite solution is sent to a sewage treatment device (J) through a high-salinity wastewater pump (10).
3. The method of claim 2, wherein: in the step (1), the temperature of the waste sodium hypochlorite solution outlet (3b) of the heater is controlled to be 40-60 ℃.
4. The method of claim 2, wherein: in the step (2), the pressure of the degassing tower is controlled to be- (50-70) KPa.
5. The method of claim 2, wherein: in the step (3), the temperature of the low-temperature water is 15-25 ℃, and the temperature of the chilled water is-7-0 ℃.
6. The method of claim 2, wherein: in the step (4), the pH value of the liquid in the waste sodium hypochlorite collecting tank is 7-9.
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| CN201911295748.8A CN111003818A (en) | 2019-12-16 | 2019-12-16 | Device and method for preventing waste sodium hypochlorite heater from scaling |
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| CN201911295748.8A CN111003818A (en) | 2019-12-16 | 2019-12-16 | Device and method for preventing waste sodium hypochlorite heater from scaling |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342399A (en) * | 2013-08-01 | 2013-10-09 | 新疆中泰化学股份有限公司 | Stripping system and stripping method for cleaning waste sodium hypochlorite in production of acetylene by virtue of calcium carbide method |
| CN103342435A (en) * | 2013-07-30 | 2013-10-09 | 广西德陆科技有限公司 | Comprehensive utilization device of acetylene purification waste sodium hypochlorite |
| CN211283892U (en) * | 2019-12-16 | 2020-08-18 | 内蒙古蒙维科技有限公司 | Device for preventing scaling of waste sodium hypochlorite heater |
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2019
- 2019-12-16 CN CN201911295748.8A patent/CN111003818A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103342435A (en) * | 2013-07-30 | 2013-10-09 | 广西德陆科技有限公司 | Comprehensive utilization device of acetylene purification waste sodium hypochlorite |
| CN103342399A (en) * | 2013-08-01 | 2013-10-09 | 新疆中泰化学股份有限公司 | Stripping system and stripping method for cleaning waste sodium hypochlorite in production of acetylene by virtue of calcium carbide method |
| CN211283892U (en) * | 2019-12-16 | 2020-08-18 | 内蒙古蒙维科技有限公司 | Device for preventing scaling of waste sodium hypochlorite heater |
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