CN116443965A - Integrated purification method for coke oven gas desulfurization waste liquid and sulfur melting tail gas - Google Patents
Integrated purification method for coke oven gas desulfurization waste liquid and sulfur melting tail gas Download PDFInfo
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- CN116443965A CN116443965A CN202310455268.3A CN202310455268A CN116443965A CN 116443965 A CN116443965 A CN 116443965A CN 202310455268 A CN202310455268 A CN 202310455268A CN 116443965 A CN116443965 A CN 116443965A
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- tail gas
- desulfurization
- waste liquid
- clear liquid
- gas outlet
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- 239000007788 liquid Substances 0.000 title claims abstract description 224
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 156
- 230000023556 desulfurization Effects 0.000 title claims abstract description 156
- 239000002699 waste material Substances 0.000 title claims abstract description 120
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000011593 sulfur Substances 0.000 title claims abstract description 98
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 98
- 238000002844 melting Methods 0.000 title claims abstract description 71
- 230000008018 melting Effects 0.000 title claims abstract description 68
- 238000000746 purification Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000571 coke Substances 0.000 title description 3
- 238000005406 washing Methods 0.000 claims abstract description 63
- 150000003839 salts Chemical class 0.000 claims abstract description 18
- 238000000605 extraction Methods 0.000 claims abstract description 13
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000000919 ceramic Substances 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 238000001179 sorption measurement Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 15
- 238000011045 prefiltration Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 230000003009 desulfurizing effect Effects 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052573 porcelain Inorganic materials 0.000 claims description 4
- 239000011149 active material Substances 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract description 3
- 235000011152 sodium sulphate Nutrition 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- VGTPCRGMBIAPIM-UHFFFAOYSA-M sodium thiocyanate Chemical compound [Na+].[S-]C#N VGTPCRGMBIAPIM-UHFFFAOYSA-M 0.000 abstract description 2
- 230000000295 complement effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 185
- 239000007921 spray Substances 0.000 description 10
- 239000012535 impurity Substances 0.000 description 7
- 239000008235 industrial water Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- YNTCDWYDVCVNPF-UHFFFAOYSA-N [C-]#N.[Na+].S(=O)(=O)(O)O Chemical compound [C-]#N.[Na+].S(=O)(=O)(O)O YNTCDWYDVCVNPF-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses an integrated purification method for desulfurization waste liquid and a tail gas outlet. The method comprises the steps of pre-filtering desulfurization waste liquid and then performing two-stage purification to obtain desulfurization clear liquid; part of the desulfurization clear liquid is sent to a tail gas cooler, and the rest of the desulfurization clear liquid is sent to a sulfur melting tail gas washing and purifying tower; the tail gas outlet enters a tail gas cooler and exchanges heat with the desulfurization clear liquid, and the desulfurization clear liquid is heated in the tail gas cooler and then is sent to a salt extraction system for salt extraction to produce sodium sulfate and sodium thiocyanate products; the tail gas outlet is cooled in the tail gas cooler and then enters the sulfur melting tail gas washing and purifying tower, the tail gas after being purified is sprayed, washed and purified by desulfurization clear liquid, and the purified tail gas is connected into the VOCs system. The invention not only improves the poor purification effect of the desulfurization waste liquid, but also realizes the waste utilization of the desulfurization waste liquid and the complementary energy application of the tail gas outlet, reduces the emission of pollutants in the tail gas outlet, does not generate new waste water in the whole purification process, and realizes the purposes of waste utilization, emission reduction and energy consumption reduction.
Description
Technical Field
The invention relates to the technical field of industrial waste liquid and tail gas treatment, in particular to a method for purifying a coke oven gas desulfurization waste liquid and a tail gas outlet.
Background
Inorganic salts such as thiocyanate, thiosulfate, sulfate and the like are generated due to side reaction in the desulfurization process, the inorganic salts accumulate to a certain concentration, crystallization is easy to separate out and block equipment, and desulfurization efficiency is severely reduced. Therefore, the desulfurization liquid needs to be discharged periodically. The desulfurization waste liquid discharged by the same type of factories is generally treated by standing, precipitating and purifying and then sending to a salt extraction system or a sintering process. The desulfurizing liquid purified by the method only can remove the impurities with larger particles in the desulfurizing waste liquid, but also cannot remove the fine particles and sulfur simple substances in the desulfurizing waste liquid, and the problems of environmental pollution and the like caused by more impurities and large peculiar smell of the desulfurizing waste liquid after standing, precipitating and purifying still exist, and crystallization is easy to separate out to block a conveying pipeline.
The prior process for producing sulfur by melting sulfur (not limited by normal pressure or pressure vessels and not limited by continuous sulfur melting or intermittent sulfur melting) needs the steps of heating, melting and cooling and shaping, and a sulfur melting device can produce tail gas containing a large amount of organic and inorganic volatile harmful gases at 150-250 ℃ during heating and melting. Most of the same type of factories spray, wash and purify the tail gas by using industrial water and then discharge the tail gas, but the tail gas outlet is sprayed, washed and purified by using industrial water, so that not only can a large amount of industrial water be consumed, but also new waste liquid can be generated, and the residual energy of the tail gas outlet cannot be utilized.
In addition, the above purification method of desulfurization waste liquid and exhaust gas outlet has the following problems: firstly, the desulfurization waste liquid has poor purification effect, and more impurities still exist after purification; and secondly, the desulfurization waste liquid and the tail gas outlet cannot realize integrated purification treatment, and the purified desulfurization clear liquid cannot realize secondary utilization.
Disclosure of Invention
The invention provides an integrated purification method for desulfurization waste liquid and a tail gas outlet, which integrates and purifies the desulfurization waste liquid and the tail gas outlet, thereby not only improving the poor purification effect of the desulfurization waste liquid, but also realizing the waste utilization of the desulfurization waste liquid and the residual energy utilization of the tail gas outlet, and reducing the emission of pollutants in the tail gas outlet.
In order to solve the problems, the invention adopts the following technical scheme:
the method comprises the steps that integrated purification equipment is adopted to carry out integrated purification on desulfurization waste liquid and a tail gas outlet, wherein the integrated purification equipment comprises a tail gas outlet collecting device and a desulfurization waste liquid tank, the tail gas outlet collecting device is connected with a tail gas cooler, and the tail gas cooler is connected with salt extraction system equipment; the desulfurization waste liquid tank is sequentially connected with a waste liquid pump, a filter press, an intermediate tank pump, a primary filter, a secondary filter and a clear liquid tank, the clear liquid tank is connected with a sulfur melting tail gas washing and purifying tower through a clear liquid pump, and the clear liquid tank is connected with the tail gas cooler through a clear liquid pump; the tail gas cooler is connected with a tail gas fan, the tail gas fan is positioned between the tail gas cooler and the sulfur melting tail gas washing and purifying tower, and the sulfur melting tail gas washing and purifying tower is connected with a VOCs system;
the method for integrally purifying the desulfurization waste liquid and the tail gas outlet by adopting the integrated purifying equipment comprises the following specific steps:
A. introducing desulfurization waste liquid in the desulfurization waste liquid tank into a filter press through a waste liquid pump to perform prefiltration, and then flowing into an intermediate tank to obtain prefiltration desulfurization waste liquid;
B. the prefilter desulfurization waste liquid in the middle tank is sequentially sent into a first-stage filter and a second-stage filter through a middle tank pump to carry out two-stage purification treatment, and flows into a clean liquid tank to obtain desulfurization clean liquid;
C. feeding the desulfurization clear liquid in the clear liquid tank to two different places through clear liquid pumps, wherein a part of the desulfurization clear liquid is fed to a sulfur melting tail gas washing and purifying tower, and the rest desulfurization clear liquid is fed to a tail gas cooler;
D. the tail gas outlet collected by the tail gas outlet collecting device enters a tail gas cooler, exchanges heat with the desulfurization clear liquid sent into the tail gas cooler, and sends the desulfurization clear liquid to salt extraction system equipment after being heated in the tail gas cooler; and the tail gas outlet is cooled in the tail gas cooler and then is sent into the sulfur melting tail gas washing and purifying tower through the tail gas fan, and the desulfurized clear liquid sent into the sulfur melting tail gas washing and purifying tower is sprayed, washed and purified, and the purified tail gas is connected into the VOCs system.
Among the above technical schemes, more specific technical schemes may also be: the tail gas outlet collecting device comprises a sulfur melting device, a pressure relief valve is arranged at the top of the sulfur melting device and connected with the tail gas cooler, a sulfur release valve is arranged at the bottom of the sulfur melting device, a sulfur release chamber is arranged below the sulfur release valve, a tail gas outlet collecting cover is arranged right above the sulfur release chamber, and the tail gas outlet collecting cover is connected with the tail gas cooler.
Further, a first tail gas inlet is formed in the upper end of one side of the tail gas cooler, and the first tail gas inlet is connected with the tail gas outlet collecting cover; the upper end of the other side of the tail gas cooler is provided with a desulfurization clear liquid inlet I, the desulfurization clear liquid inlet I is connected with the clear liquid pump, the upper end of the other side of the tail gas cooler is provided with a tail gas outlet I, and the tail gas outlet I is connected with the tail gas fan; the bottom of the tail gas cooler is provided with a desulfurization clear liquid outlet, and the desulfurization clear liquid outlet is connected with the salt extraction system equipment.
Further, a second tail gas outlet is formed in the top end of the sulfur melting tail gas washing and purifying tower, a spraying device is arranged at the middle upper part of the sulfur melting tail gas washing and purifying tower, the spraying device is connected with the clear liquid pump through a second desulfurization clear liquid inlet, a second tail gas inlet is formed in the lower end of the sulfur melting tail gas washing and purifying tower, the second tail gas inlet faces to an air outlet of the tail gas fan, a washing waste liquid outlet is formed in the bottom end of the sulfur melting tail gas washing and purifying tower, and the washing waste liquid outlet is connected with the desulfurization waste liquid groove.
Further, the primary filter uses microporous porcelain sand as a filter medium and porcelain corundum as a filter material support, and the secondary filter uses an active material as a filter medium.
Further, the primary filter is a porous composite filter material ceramic filter, and the secondary filter is an activated carbon adsorption ceramic filter.
Further, the more specific desulfurization waste liquid and tail gas outlet integrated purification method comprises the following steps:
A. introducing desulfurization waste liquid in the desulfurization waste liquid tank into a filter press through a waste liquid pump for prefiltering, and allowing the prefiltered desulfurization waste liquid to flow into an intermediate tank to obtain prefiltered desulfurization waste liquid;
B. the prefilter desulfurization waste liquid in the middle tank is firstly sent into a porous composite filter material ceramic filter for primary filtration and purification through a middle tank pump, then sent into an active carbon adsorption ceramic filter for secondary adsorption deep purification, and finally flows into a liquid cleaning tank to obtain desulfurization clear liquid;
C. feeding the desulfurization clear liquid in the clear liquid tank to two different places through clear liquid pumps, wherein a part of the desulfurization clear liquid is fed to a sulfur melting tail gas washing and purifying tower, and the rest desulfurization clear liquid is fed to a tail gas cooler;
D. on the one hand, a tail gas outlet generated when the sulfur melting device is depressurized enters the tail gas cooler through a pressure release valve and a first tail gas inlet, and exchanges heat with desulfurization clear liquid sent into the tail gas cooler; on the other hand, when the sulfur melting device is used for placing sulfur, a sulfur valve is opened to place sulfur into a sulfur placing chamber, a generated tail gas outlet rises to the top of the sulfur placing chamber and is collected by a tail gas outlet collecting cover, then the tail gas enters a tail gas cooler through a tail gas inlet I, heat exchange is carried out on the tail gas outlet I and the desulfurizing clear liquid sent into the tail gas cooler, and the desulfurizing clear liquid is heated in the tail gas cooler and then sent to salt lifting system equipment; the tail gas outlet is cooled in the tail gas cooler, then enters the tail gas fan from the tail gas outlet I, is sent into the sulfur melting tail gas washing and purifying tower through the tail gas inlet II, and is then sent into the sulfur melting tail gas washing and purifying tower to be washed and purified through the spraying device, and the tail gas outlet after washing and purifying is discharged through the sulfur melting tail gas outlet II; and the desulfurization clear liquid sent into the desulfurization tail gas washing and purifying tower from the desulfurization clear liquid inlet II is changed into washing waste liquid after spraying and washing desulfurization tail gas, and the washing waste liquid and the condensed waste liquid condensed in the tail gas cooler are sent into a desulfurization waste liquid tank for circulation treatment.
Furthermore, the bottoms of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are respectively provided with a back flushing pipeline, and the tops of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are respectively connected with the desulfurization waste liquid tank.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the desulfurization waste liquid is pre-filtered and then sequentially subjected to primary filtration purification and secondary adsorption deep purification, so that the filtration effect of the desulfurization waste liquid is improved, and the problems of high odor, color, blockage of a transportation pipeline and the like of the desulfurization waste liquid are solved; and then delivering the desulfurization clear liquid obtained after the desulfurization waste liquid is filtered to different positions: (1) is sent to a sulfur melting tail gas washing and purifying tower to replace industrial water to spray, wash and purify a tail gas outlet, so that the consumption of the industrial water is reduced, no new waste water is generated, and waste liquid generated by washing is sent back to a desulfurization waste liquid tank for recycling treatment; (2) the waste heat is sent to a tail gas cooler to exchange heat with a tail gas outlet which is collected and provided with waste heat, and the heated desulfurization clear liquid is sent to a salt extraction system to extract and produce sodium sulfate and sodium cyanide sulfate products, so that the waste heat of the desulfurization tail gas is fully utilized, and meanwhile, the tail gas outlet is indirectly cooled through the desulfurization clear liquid, so that most of water vapor and part of condensable or water-soluble harmful gas in the tail gas outlet are removed to form condensed waste liquid.
2. The invention pre-filters the desulfurization waste liquid to remove large-particle solid impurities, then filters the desulfurization waste liquid by using a ceramic filter, reduces the resistance of the ceramic filter, prolongs the interval of backwashing by 5-10 times, prolongs the time of stable operation of the ceramic filter, and prolongs the service life of the filter material by 5-10 times.
3. The purified clear liquid of the invention has lighter color and smaller peculiar smell, and solves the environmental protection problem that the desulfurization waste liquid has large peculiar smell and causes great pollution to production posts.
Drawings
Fig. 1 is a block diagram of an integrated decontamination apparatus employed in the present invention.
FIG. 2 is a schematic diagram of an example desulfurization waste liquid and tail gas outlet integrated purification process.
Detailed Description
The invention is further described in detail below with reference to the attached drawings and examples:
FIG. 1 is a block diagram of an integrated purification device used in the integrated purification method for desulfurization waste liquid and tail gas outlets, the integrated purification device comprises a tail gas outlet collection device 15 and a desulfurization waste liquid tank 1, wherein the tail gas outlet collection device 15 is connected with a tail gas cooler 13, and the tail gas cooler 13 is connected with a salt extraction system device 14; the desulfurization waste liquid tank 1 is sequentially connected with a waste liquid pump 2, a filter press 3, an intermediate tank 4, an intermediate tank pump 5, a primary filter 6, a secondary filter 7 and a clear liquid tank 8, the clear liquid tank 8 is connected with a sulfur melting tail gas washing and purifying tower 10 through a clear liquid pump 9, the sulfur melting tail gas washing and purifying tower 10 is connected with a VOCs system 11, and the clear liquid tank 8 is connected with a tail gas cooler 13 through the clear liquid pump 9; the tail gas cooler 13 is connected with a tail gas fan 12, the tail gas fan 12 is positioned between the tail gas cooler 13 and the sulfur melting tail gas washing and purifying tower 10, and the sulfur melting tail gas washing and purifying tower 10 is connected with a VOCs system 11.
In addition to the above-described structure, the specific structure of the exhaust gas outlet collection device 15 in the integrated purification apparatus is as follows: the tail gas outlet collecting device 15 comprises a sulfur melting device 15-1, a pressure release valve 15-2 is arranged at the top of the sulfur melting device 15-1, the pressure release valve 15-2 is connected with the tail gas cooler 13, a sulfur release valve 15-3 is arranged at the bottom of the sulfur melting device 15-1, a sulfur release chamber 15-4 is arranged below the sulfur release valve 15-3, a tail gas outlet collecting cover 15-5 is arranged right above the sulfur release chamber 15-4 and used for collecting generated tail gas, and the tail gas outlet collecting cover 15-5 is connected with the tail gas cooler 13. The sulfur-melting device 15 is not limited to the normal pressure or the pressure vessel, and the sulfur-melting production method is not limited to continuous or intermittent sulfur melting, and if the sulfur-melting device 15 is a normal pressure vessel, the pressure release valve 15-2 is not provided.
The upper end of one side of the tail gas cooler 13 is provided with a first tail gas inlet 13-1, and the first tail gas inlet 13-1 is connected with a tail gas outlet collecting cover 15-5; the upper end of the other side of the tail gas cooler 13 is provided with a desulfurization clear liquid inlet I13-2, the desulfurization clear liquid inlet I13-2 is connected with a clear liquid pump 9, the upper end of the side of the tail gas cooler 13 is provided with a tail gas outlet I13-3, and the tail gas outlet I13-3 is connected with a tail gas fan 12; the bottom end of the tail gas cooler 13 is provided with a desulfurization clear liquid outlet 13-4, and the desulfurization clear liquid outlet 13-4 is connected with salt extraction system equipment 14.
The top end of the sulfur melting tail gas washing and purifying tower 10 is provided with a second tail gas outlet 10-1, and the second tail gas outlet 10-1 is connected with a VOCs system 11 to further treat the tail gas outlet; the middle upper part of the sulfur melting tail gas washing and purifying tower 10 is provided with a spraying device 10-2, the spraying device 10-2 is connected with a clear liquid pump 9 through a desulfurization clear liquid inlet II 10-3, the lower end of the sulfur melting tail gas washing and purifying tower 10 is provided with a tail gas inlet II 10-4, the tail gas inlet II 10-4 is opposite to an air outlet of a tail gas fan 12, the bottom end of the sulfur melting tail gas washing and purifying tower 10 is provided with a washing waste liquid outlet 10-5, and the washing waste liquid outlet 10-5 is connected with a desulfurization waste liquid groove 1.
The primary filter 6 is supported by using microporous ceramic sand as a filter medium and ceramic corundum as a filter medium, and the secondary filter is supported by using an active material as a filter medium, for example, in the following embodiment, the primary filter 6 is a porous composite filter material ceramic filter, and the secondary filter is an active carbon adsorption ceramic filter.
The bottoms of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are respectively provided with a back flushing pipeline 16, the tops of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are also connected with the desulfurization waste liquid tank 1, the desulfurization clear liquid obtained after the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are filtered by the method is regularly back flushed, the desulfurization waste liquid is prevented from precipitating crystals in the conveying process to block the conveying pipeline, and the back flushing liquid flows back to the desulfurization waste liquid tank 1 for cyclic treatment.
As shown in fig. 1 and 2, specific embodiments are as follows:
A. the desulfurization waste liquid generated by the desulfurization system is recycled to the desulfurization waste liquid tank 1 for storage, the desulfurization waste liquid is sent to the filter press 3 for prefiltration treatment by the waste liquid pump 2, the large-particle solid impurities are removed and then automatically flow into the middle tank 4 for storage, the large-particle solid impurities which are removed and are in paste form are sent to the sulfur paste foam tank, and then are sent to the sulfur melting device 15-1 together with sulfur foam generated by the desulfurization regeneration tower for producing sulfur;
B. the desulfurization waste liquid after the filtration treatment in the middle tank 4 is firstly sent to a porous composite filter material ceramic filter 6 for primary filtration and purification by a middle tank pump 5, then sent to an active carbon adsorption ceramic filter 7 for secondary adsorption and deep purification, elemental sulfur and tiny particle impurities in the desulfurization waste liquid are removed, desulfurization clear liquid is obtained and is sent to a clear liquid tank 8 for storage, and the desulfurization clear liquid is lighter in color and smaller in peculiar smell, so that the environmental protection problem that the desulfurization waste liquid emits peculiar smell and causes larger pollution to production posts is solved; meanwhile, a back flushing pipeline 16 is arranged on the porous composite filter material ceramic filter 6 and the active carbon adsorption ceramic filter 7, back flushing is carried out on desulfurization clear liquid obtained after the porous composite filter material ceramic filter 6 and the active carbon adsorption ceramic filter 7 are filtered by the method at regular intervals, so that the desulfurization waste liquid is prevented from being separated out and crystallized in the conveying process to block a conveying pipeline, and the back flushing liquid flows back to the desulfurization waste liquid tank 1 for circular treatment;
C. the desulfurization clear liquid in the clear liquid tank 8 is sent to two different places through a clear liquid pump 9, wherein, part of the desulfurization clear liquid is sent to a sulfur melting tail gas washing and purifying tower 10, and the rest desulfurization clear liquid is sent to a tail gas cooler 13;
D. in the embodiment, the pressure type sulfur melting device 15-1 is adopted, so that on one hand, a tail gas outlet generated when the sulfur melting device 15-1 is depressurized enters the tail gas cooler 13 through the pressure release valve 15-2 and the tail gas inlet I13-1 to exchange heat with the desulfurization clear liquid sent into the tail gas cooler 13; on the other hand, when sulfur is discharged by the sulfur melting device 15-1, an open sulfur valve 15-3 is opened to put sulfur into a sulfur discharge chamber 15-4, a generated tail gas outlet is raised to the top of the sulfur discharge chamber 15-4 and is collected by a tail gas outlet collecting cover 15-5, then the tail gas enters a tail gas cooler 13 through a tail gas inlet I13-1, heat exchange is carried out on the tail gas and the desulfurized clear liquid sent into the tail gas cooler 13, the desulfurized clear liquid is heated to 15-20 ℃ in the tail gas cooler 13 and then sent to a salt extraction system device 14 to extract and produce sodium sulfate and sodium thiocyanate auxiliary salt products, so that the waste heat of the desulfurized tail gas is fully utilized, meanwhile, the tail gas outlet is indirectly cooled through the desulfurized clear liquid, most of water and partial condensable or water-soluble harmful gas in the tail gas outlet are formed to be removed, and the tail gas outlet is primarily purified in the tail gas cooler 13 and is cooled to 70-80 ℃, then enters a tail gas fan 12 from the tail gas outlet I13-3, the tail gas fan 12 is sent into a sulfur melting washing tower 10 through a tail gas inlet II 10-4, and then sent into the sulfur melting washing tower 10 through a tail gas washing tower 10-4 to be further treated through a spray system to reduce the temperature of the tail gas washing tower 10-45, and the tail gas is further treated through a spray system to be discharged through a spray system to reduce the tail gas washing system, and the tail gas clean the tail gas is further treated, and the tail gas is purified through a spray system is further treated through a spray system to be purified through a spray system, and a spray system is subjected to a spray clean 11, and a tail gas clean 11 is subjected to a tail gas clean 11, and a tail gas clean is subjected to a tail gas clean exhaust waste is further is subjected to a tail gas clean and a waste; the desulfurization clear liquid fed into the desulfurization tail gas washing and purifying tower 10 from the desulfurization clear liquid inlet II 10-3 is changed into washing waste liquid after the desulfurization tail gas is sprayed and washed, and the washing waste liquid and the condensed waste liquid condensed in the tail gas cooler 13 are fed into the desulfurization waste liquid tank 1 for circulation treatment, so that the purposes of waste utilization of the desulfurization waste liquid, waste energy application of a tail gas outlet and emission of pollutants in the tail gas outlet are realized, new waste water is not generated in the whole purifying process, and the purposes of waste utilization, emission reduction and energy consumption reduction are realized.
It should be noted that: the above embodiments are presented to illustrate the technical solution of the present invention, but not to limit it; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An integrated purification method for desulfurization waste liquid and tail gas outlet is characterized in that: the method comprises the steps that integrated purification equipment is adopted to carry out integrated purification on desulfurization waste liquid and a tail gas outlet, wherein the integrated purification equipment comprises a tail gas outlet collecting device and a desulfurization waste liquid tank, the tail gas outlet collecting device is connected with a tail gas cooler, and the tail gas cooler is connected with salt extraction system equipment; the desulfurization waste liquid tank is sequentially connected with a waste liquid pump, a filter press, an intermediate tank pump, a primary filter, a secondary filter and a clear liquid tank, the clear liquid tank is connected with a sulfur melting tail gas washing and purifying tower through a clear liquid pump, and the clear liquid tank is connected with the tail gas cooler through a clear liquid pump; the tail gas cooler is connected with a tail gas fan, the tail gas fan is positioned between the tail gas cooler and the sulfur melting tail gas washing and purifying tower, and the sulfur melting tail gas washing and purifying tower is connected with a VOCs system;
the method for integrally purifying the desulfurization waste liquid and the tail gas outlet by adopting the integrated purifying equipment comprises the following specific steps:
A. introducing desulfurization waste liquid in the desulfurization waste liquid tank into a filter press through a waste liquid pump to perform prefiltration, and then flowing into an intermediate tank to obtain prefiltration desulfurization waste liquid;
B. the prefilter desulfurization waste liquid in the middle tank is sequentially sent into a first-stage filter and a second-stage filter through a middle tank pump to carry out two-stage purification treatment, and flows into a clean liquid tank to obtain desulfurization clean liquid;
C. feeding the desulfurization clear liquid in the clear liquid tank to two different places through clear liquid pumps, wherein a part of the desulfurization clear liquid is fed to a sulfur melting tail gas washing and purifying tower, and the rest desulfurization clear liquid is fed to a tail gas cooler;
D. the tail gas outlet collected by the tail gas outlet collecting device enters a tail gas cooler, exchanges heat with the desulfurization clear liquid sent into the tail gas cooler, and sends the desulfurization clear liquid to salt extraction system equipment after being heated in the tail gas cooler; and the tail gas outlet is cooled in the tail gas cooler and then is sent into the sulfur melting tail gas washing and purifying tower through the tail gas fan, and the desulfurized clear liquid sent into the sulfur melting tail gas washing and purifying tower is sprayed, washed and purified, and the purified tail gas is connected into the VOCs system.
2. The integrated desulfurization waste liquid and tail gas outlet purification method according to claim 1, characterized in that: the tail gas outlet collecting device comprises a sulfur melting device, a pressure relief valve is arranged at the top of the sulfur melting device and connected with the tail gas cooler, a sulfur release valve is arranged at the bottom of the sulfur melting device, a sulfur release chamber is arranged below the sulfur release valve, a tail gas outlet collecting cover is arranged right above the sulfur release chamber, and the tail gas outlet collecting cover is connected with the tail gas cooler.
3. The integrated desulfurization waste liquid and tail gas outlet purification method according to claim 2, characterized in that: the upper end of one side of the tail gas cooler is provided with a first tail gas inlet which is connected with the tail gas outlet collecting cover; the upper end of the other side of the tail gas cooler is provided with a desulfurization clear liquid inlet I, the desulfurization clear liquid inlet I is connected with the clear liquid pump, the upper end of the other side of the tail gas cooler is provided with a tail gas outlet I, and the tail gas outlet I is connected with the tail gas fan; the bottom of the tail gas cooler is provided with a desulfurization clear liquid outlet, and the desulfurization clear liquid outlet is connected with the salt extraction system equipment.
4. The integrated desulfurization waste liquid and tail gas outlet purification method according to claim 3, characterized in that: the top of the sulfur melting tail gas washing and purifying tower is provided with a tail gas outlet II, the middle upper part of the sulfur melting tail gas washing and purifying tower is provided with a spraying device, the spraying device is connected with the clear liquid pump through a desulfurization clear liquid inlet II, the lower end of the sulfur melting tail gas washing and purifying tower is provided with a tail gas inlet II, the tail gas inlet II faces the air outlet of the tail gas fan, the bottom of the sulfur melting tail gas washing and purifying tower is provided with a washing waste liquid outlet, and the washing waste liquid outlet is connected with the desulfurization waste liquid groove.
5. The integrated desulfurization waste liquid and tail gas outlet purification method according to claim 4, characterized by comprising the steps of:
the primary filter uses microporous porcelain sand as a filter medium and porcelain corundum as a filter material support, and the secondary filter uses an active material as a filter medium.
6. The integrated desulfurization waste liquid and tail gas outlet purification method according to claim 5, characterized by comprising the steps of:
the primary filter is a porous composite filter material ceramic filter, and the secondary filter is an activated carbon adsorption ceramic filter.
7. The integrated purification method for desulfurization waste liquid and exhaust gas outlet according to claim 6, characterized in that the more specific integrated purification method for desulfurization waste liquid and exhaust gas outlet is as follows:
A. introducing desulfurization waste liquid in the desulfurization waste liquid tank into a filter press through a waste liquid pump for prefiltering, and allowing the prefiltered desulfurization waste liquid to flow into an intermediate tank to obtain prefiltered desulfurization waste liquid;
B. the prefilter desulfurization waste liquid in the middle tank is firstly sent into a porous composite filter material ceramic filter for primary filtration and purification through a middle tank pump, then sent into an active carbon adsorption ceramic filter for secondary adsorption deep purification, and finally flows into a liquid cleaning tank to obtain desulfurization clear liquid;
C. feeding the desulfurization clear liquid in the clear liquid tank to two different places through clear liquid pumps, wherein a part of the desulfurization clear liquid is fed to a sulfur melting tail gas washing and purifying tower, and the rest desulfurization clear liquid is fed to a tail gas cooler;
D. on the one hand, a tail gas outlet generated when the sulfur melting device is depressurized enters the tail gas cooler through a pressure release valve and a first tail gas inlet, and exchanges heat with desulfurization clear liquid sent into the tail gas cooler; on the other hand, when the sulfur melting device is used for placing sulfur, a sulfur valve is opened to place sulfur into a sulfur placing chamber, a generated tail gas outlet rises to the top of the sulfur placing chamber and is collected by a tail gas outlet collecting cover, then the tail gas enters a tail gas cooler through a tail gas inlet I, heat exchange is carried out on the tail gas outlet I and the desulfurizing clear liquid sent into the tail gas cooler, and the desulfurizing clear liquid is heated in the tail gas cooler and then sent to salt lifting system equipment; the tail gas outlet is cooled in the tail gas cooler, then enters the tail gas fan from the tail gas outlet I, is sent into the sulfur melting tail gas washing and purifying tower through the tail gas inlet II, and is then sent into the sulfur melting tail gas washing and purifying tower to be washed and purified through the spraying device, and the tail gas outlet after washing and purifying is discharged through the sulfur melting tail gas outlet II; and the desulfurization clear liquid sent into the desulfurization tail gas washing and purifying tower from the desulfurization clear liquid inlet II is changed into washing waste liquid after spraying and washing desulfurization tail gas, and the washing waste liquid and the condensed waste liquid condensed in the tail gas cooler are sent into a desulfurization waste liquid tank for circulation treatment.
8. The integrated desulfurization waste liquid and tail gas outlet purification method according to claim 7, characterized in that:
the bottom of the porous composite filter material ceramic filter and the bottom of the activated carbon adsorption ceramic filter are respectively provided with a back flushing pipeline, and the tops of the porous composite filter material ceramic filter and the activated carbon adsorption ceramic filter are respectively connected with the desulfurization waste liquid tank.
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| CN202310455268.3A CN116443965A (en) | 2023-04-25 | 2023-04-25 | Integrated purification method for coke oven gas desulfurization waste liquid and sulfur melting tail gas |
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| CN202310455268.3A CN116443965A (en) | 2023-04-25 | 2023-04-25 | Integrated purification method for coke oven gas desulfurization waste liquid and sulfur melting tail gas |
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