CN115597044A - Method for utilizing waste heat of tail gas generated by continuous acidolysis of titanium dioxide by sulfuric acid process - Google Patents

Method for utilizing waste heat of tail gas generated by continuous acidolysis of titanium dioxide by sulfuric acid process Download PDF

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Publication number
CN115597044A
CN115597044A CN202211308206.1A CN202211308206A CN115597044A CN 115597044 A CN115597044 A CN 115597044A CN 202211308206 A CN202211308206 A CN 202211308206A CN 115597044 A CN115597044 A CN 115597044A
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China
Prior art keywords
tail gas
heat exchanger
acidolysis
heat
waste
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CN202211308206.1A
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Chinese (zh)
Inventor
徐天龙
蒋革
马明建
刘洪金
郭红丹
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Panzhihua Haifengxin Chemical Co ltd
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Panzhihua Haifengxin Chemical Co ltd
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Publication of CN115597044A publication Critical patent/CN115597044A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1892—Systems therefor not provided for in F22B1/1807 - F22B1/1861
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • 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
    • 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
    • B01D53/002—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 by condensation
    • 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
    • B01D53/26—Drying gases or vapours
    • 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
    • B01D53/40—Acidic 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/52—Hydrogen sulfide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/304—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

The invention discloses a method for utilizing waste heat of tail gas from continuous acidolysis of titanium dioxide by a sulfuric acid method, belonging to the technical field of acidolysis of tail gas, and the method for utilizing the waste heat of the tail gas from continuous acidolysis of titanium dioxide by the sulfuric acid method comprises the following steps: conveying the acidolysis tail gas into a bag type dust collector through a pipeline for bag type dust collection; the tail gas after bag type dust removal enters a desulfurizer for dry desulfurization, and the removed sulfur is conveyed to an acid making process for acid making; conveying steam generated after desulfurization to a secondary heat exchanger for heat exchange, and feeding steam condensate water generated after heat exchange into a primary heat exchanger; the titanium liquid and the waste acid enter the primary heat exchanger and are preheated through the steam condensate water, and the preheated titanium liquid and the preheated waste acid enter the secondary heat exchanger and exchange heat with steam entering the secondary heat exchanger.

Description

Method for utilizing waste heat of tail gas generated in continuous acidolysis of titanium white by sulfuric acid process
Technical Field
The invention relates to the technical field of acidolysis tail gas treatment, in particular to a method for utilizing waste heat of titanium dioxide continuous acidolysis tail gas by a sulfuric acid method.
Background
The tail gas from acidolysis is generated during acidolysis, and mainly contains a large amount of water vapor, acid mist and H 2 S、SO 2 And the like, which cause serious pollution to the environment, and can be discharged after being treated.
Current acidolysis tail gas mode is through in transmitting acidolysis tail gas to the spray column, the spray column sprays alkali lye and carries out the neutralization to it, the tail gas after the spray column is handled to the mode that rethread venturi sprays, will obtain the tail gas after venturi sprays the processing and directly discharges in the air, current acidolysis tail gas has only been considered and has been cooled down and remove dust and tail gas desulfurization, and do not utilize heat energy, mainly adopt water (alkali lye) to spray and cool down and the desulfurization, heat energy is useless for vain.
Disclosure of Invention
The invention aims to provide a method for utilizing waste heat of tail gas generated by continuous acidolysis of titanium dioxide by a sulfuric acid process, and aims to solve the problems that the conventional acidolysis tail gas provided by the background art only considers temperature reduction and dust removal and tail gas desulfurization, does not utilize heat energy, mainly adopts water (alkali liquor) spraying for temperature reduction and desulfurization, and wastes the heat energy.
In order to achieve the purpose, the invention provides the following technical scheme: a method for utilizing waste heat of tail gas generated by continuous acidolysis of titanium white by a sulfuric acid process comprises the following steps:
s1: conveying the acidolysis tail gas into a bag type dust collector through a pipeline for bag type dust collection;
s2: the tail gas after bag type dust removal enters a desulfurizer for dry desulfurization, and the removed sulfur is conveyed to an acid making process for acid making;
s3: conveying steam generated after desulfurization to a secondary heat exchanger for heat exchange, and feeding steam condensate water generated after heat exchange into a primary heat exchanger;
s4: the titanium liquid and the waste acid enter a primary heat exchanger and are preheated through steam condensate water, the preheated titanium liquid and the preheated waste acid enter a secondary heat exchanger to exchange heat with steam entering the secondary heat exchanger, the waste acid exchanges heat and is concentrated in the secondary heat exchanger, the titanium liquid after heat exchange is hydrolyzed in a hydrolysis process, and the concentrated waste acid is hydrolyzed in an acidolysis process;
s5: and the steam after the heat exchange of the secondary heat exchanger enters the primary heat exchanger for heat exchange and then enters the tail gas fan, and the steam after the heat exchange of the primary heat exchanger is discharged into the air from the chimney through the tail gas fan.
Preferably, the temperature of the acidolysis tail gas is 160 ℃.
Preferably, the steam temperature after dry desulfurization is 120-130 ℃.
Preferably, the temperature of the steam syringa water is 80-86 ℃.
Preferably, the primary heat exchanger and the secondary heat exchanger are graphite heat exchangers or plate heat exchangers.
Preferably, the system further comprises an organic Rankine cycle generator, and the organic Rankine cycle generator is respectively connected with the primary heat exchanger and the secondary heat exchanger through pipelines.
Compared with the prior art, the invention has the beneficial effects that: according to the method for utilizing the waste heat of the continuous acidolysis tail gas of the titanium dioxide prepared by the sulfuric acid method, the acidolysis tail gas is utilized, and the titanium liquid and the waste acid are subjected to heat treatment through the temperature of the acidolysis tail gas, so that the utilization rate of the waste heat of the acidolysis tail gas is improved.
Drawings
FIG. 1 is a schematic block diagram of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for utilizing waste heat of tail gas from continuous acidolysis of titanium dioxide by a sulfuric acid method, which utilizes the acidolysis tail gas, and improves the utilization rate of the waste heat of the acidolysis tail gas by carrying out heat treatment on titanium liquid and waste acid by the temperature of the acidolysis tail gas, and referring to fig. 1, the method for utilizing the waste heat of the tail gas from continuous acidolysis of titanium dioxide by the sulfuric acid method comprises the following steps:
s1: conveying acidolysis tail gas at 160 ℃ into a bag type dust collector through a pipeline for bag type dust collection;
s2: the tail gas after bag type dust removal enters a desulfurizer for dry desulfurization, the acidolysis tail gas desulfurization adopts active carbon or ferric oxide for desulfurization, sulfur can be recovered for preparing acid by sulfur, and the tail gas after dry desulfurization generates steam at 120-130 ℃;
s3: conveying steam generated after desulfurization to a secondary heat exchanger for heat exchange, and introducing 80-86 ℃ steam condensate water generated after heat exchange into a primary heat exchanger;
s4: the method comprises the following steps that titanium liquid and waste acid enter a primary heat exchanger and are preheated through steam condensate water, the preheated titanium liquid and waste acid enter a secondary heat exchanger and exchange heat with steam entering the secondary heat exchanger, the waste acid is concentrated in the secondary heat exchanger through heat exchange, the titanium liquid after heat exchange is hydrolyzed in a hydrolysis process, the concentrated waste acid is subjected to acidolysis in an acidolysis process, the primary heat exchanger and the secondary heat exchanger are graphite heat exchangers or plate heat exchangers, the waste heat of tail gas is utilized to preheat the concentrated titanium liquid or replace steam for waste acid concentration, and in addition, in the existing acidolysis tail gas waste heat cooling process, a water cooling tower is required to be added to cool circulating water, after the tail gas heat energy is utilized, the cooling treatment of water vapor is not required, the heat energy is utilized, the water consumption and the electric energy consumption of the water cooling tower are reduced, the utilization rate of the acidolysis tail gas waste heat is improved, and the organic Rankine cycle generator is further included and is respectively connected with the primary heat exchanger and the secondary heat exchanger through pipelines, and generates electricity by utilizing the waste heat;
s5: and the steam after the heat exchange of the secondary heat exchanger enters the primary heat exchanger for heat exchange and then enters the tail gas fan, and the steam after the heat exchange of the primary heat exchanger is discharged into the air from the chimney through the tail gas fan.
Example 1
The method for utilizing the waste heat of the tail gas generated by the continuous acidolysis of titanium dioxide by the sulfuric acid method comprises the following steps:
s1: conveying acidolysis tail gas at 160 ℃ into a bag type dust collector through a pipeline for bag type dust collection;
s2: the tail gas after bag type dust removal enters a desulfurizer for dry desulfurization, the removed sulfur is conveyed to an acid making process for acid making, and the tail gas after dry desulfurization generates 120 ℃ steam;
s3: conveying steam generated after desulfurization to a secondary heat exchanger for heat exchange, and feeding steam condensate water at 80 ℃ generated after heat exchange into a primary heat exchanger;
s4: the method comprises the following steps that titanium liquid and waste acid enter a primary heat exchanger and are preheated through steam condensate water, the preheated titanium liquid and waste acid enter a secondary heat exchanger to exchange heat with steam entering the secondary heat exchanger, the waste acid is concentrated in the secondary heat exchanger through heat exchange, the titanium liquid after heat exchange is hydrolyzed in a hydrolysis process, the concentrated waste acid is hydrolyzed in an acidolysis process, and the acidolysis is carried out on the concentrated waste acid;
s5: and the steam after heat exchange of the secondary heat exchanger enters the primary heat exchanger for heat exchange and then enters the tail gas fan, and the steam after heat exchange of the primary heat exchanger is discharged into the air from the chimney through the tail gas fan.
Example 2
The method for utilizing the waste heat of the tail gas generated by the continuous acidolysis of titanium dioxide by the sulfuric acid method comprises the following steps:
s1: conveying acidolysis tail gas at 160 ℃ into a bag type dust collector through a pipeline for bag type dust collection;
s2: the tail gas subjected to bag type dust removal enters a desulfurizer for dry desulfurization, the removed sulfur is conveyed to an acid making process for acid making, and the tail gas subjected to dry desulfurization generates steam at 110 ℃;
s3: conveying steam generated after desulfurization to a secondary heat exchanger for heat exchange, and feeding 83 ℃ steam condensate water generated after heat exchange into a primary heat exchanger;
s4: the method comprises the following steps that titanium liquid and waste acid enter a primary heat exchanger and are preheated through steam condensate water, the preheated titanium liquid and waste acid enter a secondary heat exchanger to exchange heat with steam entering the secondary heat exchanger, the waste acid is concentrated in the secondary heat exchanger through heat exchange, the titanium liquid after heat exchange is hydrolyzed in a hydrolysis process, the concentrated waste acid is hydrolyzed in an acidolysis process, and the acidolysis is carried out on the concentrated waste acid;
s5: and the steam after heat exchange of the secondary heat exchanger enters the primary heat exchanger for heat exchange and then enters the tail gas fan, and the steam after heat exchange of the primary heat exchanger is discharged into the air from the chimney through the tail gas fan.
Example 3
The method for utilizing the waste heat of the tail gas generated by the continuous acidolysis of titanium dioxide by the sulfuric acid method comprises the following steps:
s1: conveying acidolysis tail gas at 160 ℃ into a bag type dust collector through a pipeline for bag type dust collection;
s2: the tail gas subjected to bag type dust removal enters a desulfurizer for dry desulfurization, the removed sulfur is conveyed to an acid making process for acid making, and the tail gas subjected to dry desulfurization generates steam at 130 ℃;
s3: conveying steam generated after desulfurization to a secondary heat exchanger for heat exchange, and feeding 86-DEG C steam condensate water generated after heat exchange into a primary heat exchanger;
s4: the method comprises the following steps that titanium liquid and waste acid enter a primary heat exchanger and are preheated through steam condensate water, the preheated titanium liquid and waste acid enter a secondary heat exchanger to exchange heat with steam entering the secondary heat exchanger, the waste acid is concentrated in the secondary heat exchanger through heat exchange, the titanium liquid after heat exchange is hydrolyzed in a hydrolysis process, the concentrated waste acid is hydrolyzed in an acidolysis process, and the acidolysis is carried out on the concentrated waste acid;
s5: and the steam after the heat exchange of the secondary heat exchanger enters the primary heat exchanger for heat exchange and then enters the tail gas fan, and the steam after the heat exchange of the primary heat exchanger is discharged into the air from the chimney through the tail gas fan.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of this invention can be used in any combination with one another as long as no structural conflict exists, and the combination is not exhaustively described in this specification merely for the sake of brevity and resource savings. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (6)

1. A method for utilizing waste heat of tail gas generated by continuous acidolysis of titanium dioxide by a sulfuric acid method is characterized by comprising the following steps: the method for utilizing the waste heat of the tail gas generated by continuous acidolysis of titanium white by the sulfuric acid process comprises the following steps:
s1: conveying the acidolysis tail gas into a bag type dust collector through a pipeline for bag type dust collection;
s2: the tail gas after bag type dust removal enters a desulfurizer for dry desulfurization, and the removed sulfur is conveyed to an acid making process for acid making;
s3: conveying steam generated after desulfurization to a secondary heat exchanger for heat exchange, and feeding steam condensate water generated after heat exchange into a primary heat exchanger;
s4: titanium liquid and waste acid enter a primary heat exchanger and are preheated through steam condensate water, the preheated titanium liquid and waste acid enter a secondary heat exchanger to exchange heat with steam entering the secondary heat exchanger, the waste acid exchanges heat and is concentrated in the secondary heat exchanger, the titanium liquid after heat exchange is hydrolyzed in a hydrolysis process, and the concentrated waste acid is hydrolyzed in an acidolysis process;
s5: and the steam after heat exchange of the secondary heat exchanger enters the primary heat exchanger for heat exchange and then enters the tail gas fan, and the steam after heat exchange of the primary heat exchanger is discharged into the air from the chimney through the tail gas fan.
2. The method for utilizing the waste heat of the tail gas generated by the continuous acidolysis of titanium dioxide by the sulfuric acid process according to claim 1, which is characterized by comprising the following steps: the temperature of the acidolysis tail gas is 160 ℃.
3. The method for utilizing the waste heat of the tail gas generated by the continuous acidolysis of titanium dioxide by the sulfuric acid process according to claim 2, which is characterized by comprising the following steps: the steam temperature after the dry desulfurization is 120-130 ℃.
4. The method for utilizing the waste heat of the tail gas from the continuous acidolysis of titanium white produced by the sulfuric acid process according to claim 3, wherein the method comprises the following steps: the temperature of the steam condensate water is 80-86 ℃.
5. The method for utilizing the waste heat of the tail gas generated by the continuous acidolysis of titanium dioxide by the sulfuric acid process according to claim 4, which is characterized by comprising the following steps: the first-stage heat exchanger and the second-stage heat exchanger are graphite heat exchangers or plate heat exchangers.
6. The method for utilizing the waste heat of the tail gas generated by the continuous acidolysis of titanium dioxide by the sulfuric acid process according to claim 5, which is characterized by comprising the following steps: the system also comprises an organic Rankine cycle generator, and the organic Rankine cycle generator is respectively connected with the primary heat exchanger and the secondary heat exchanger through pipelines.
CN202211308206.1A 2022-10-25 2022-10-25 Method for utilizing waste heat of tail gas generated by continuous acidolysis of titanium dioxide by sulfuric acid process Pending CN115597044A (en)

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Application Number Priority Date Filing Date Title
CN202211308206.1A CN115597044A (en) 2022-10-25 2022-10-25 Method for utilizing waste heat of tail gas generated by continuous acidolysis of titanium dioxide by sulfuric acid process

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CN115597044A true CN115597044A (en) 2023-01-13

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