CN104654874A - Acid and acid regeneration unit waste gas residual heat recovery and waste gas processing system and method - Google Patents
Acid and acid regeneration unit waste gas residual heat recovery and waste gas processing system and method Download PDFInfo
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- CN104654874A CN104654874A CN201510068613.3A CN201510068613A CN104654874A CN 104654874 A CN104654874 A CN 104654874A CN 201510068613 A CN201510068613 A CN 201510068613A CN 104654874 A CN104654874 A CN 104654874A
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses an acid and acid regeneration unit waste gas residual heat recovery and waste gas processing system and a method. The system comprises a graphite heat exchanger, a graphite heat exchanger water circulating pump, a water tank and a water cooling tower. The water tank is connected with the water cooling tower; a water circulating pump II is simultaneously connected with the water tank and the water cooling tower; a water circulating pump I connected with the graphite heat exchanger is simultaneously connected with the water tank. According to the acid and acid regeneration unit waste gas residual heat recovery and waste gas processing system and the method, the waste gas displacement can be remarkably reduced, a plenty of industrial water can be recovered, a lot of production resources such as natural gas and electric power can be saved, and the system and the method have significance for reducing cost, improving production efficiency, recovering resources such as heat energy, protecting environment, conserving water and the soil and the like, and has a favorable promotion function.
Description
Technical field
The present invention relates to acid regeneration unit waste gas residual heat to reclaim and technical field of waste gas treatment, especially relate to the higher acid regeneration unit waste gas residual heat of a kind of efficiency to reclaim and exhaust treatment system, and reclaim and waste gas processing method based on the acid regeneration unit waste gas residual heat that this system carries out implementing.
Background technology
Environmental protection is the restraining factors of socio-economic development all the time, and sustainable development must be based upon on the basis of environmental protection, and economic development is at the cost of the environment unsustainable.Therefore, the high pollution such as chemical industry, iron and steel industry all have developed all resource reclaim and the technological means of environmental protection, to meet the requirement of sustainable development, and the acid regeneration mode that such as steel industry is more common.
Current, several hundreds of bar acid regeneration units that domestic steel industry uses, most employing regenerates from state-of-the-art spray roasting in the world, but, the method still cannot be avoided discharging a large amount of steam and a small amount of HCI, therefore often overlap unit and have a significant chimney emitting " white cigarette ", delivery temperature 75 DEG C waste heat energy.
The existing procedure of classical classical acid regeneration unit, although carried out regeneration cycle to spent acid to greatest extent, and the connection carrying out regenerating unit and pickling unit uses, its discharge index also meets GB GB28665-2012 requirement, but, along with increase and the increasingly strict and environmental requirement of sternness of production capacity, the resource reclaim mode of current acid regeneration has seemed more single.For this problem, technical from range, should be placed on the sight of dealing with problems on steam that toxic emission goes out, carry out energy recovery, energy-saving and emission-reduction, and then environmental protect better, promotes current organic efficiency.
Chinese patent CN201080053588.7 discloses pump-down process and heat recovery system, relate to the amount controlling condensation and be accumulated in the acid on air preheater heat transfer element, thus improve air preheater extracts heat effect from the flue gas stream from such as smelting furnace combustion chamber.Relate to again sedimental " humidity " in control heat transfer surface and allow the easy state its (deposit) removed in air preheater operation deposit can be made to maintain.Also relate to the air preheater being configured to the additional heat allowing distribution to extract from flue gas stream.Thermal efficiency reproducibility air preheater extracts more heat energy by adopting alkaline injecting systems from the flue gas leaving solid fuel burner.This is by alleviating sour fouling by the alkali grain Selective implantation air preheater of different size.Granule provides the nucleation site of acid vapor condensation and neutralization.Bulky grain injection with contact and selective attachment in heat exchange elements and the liquid acid neutralizing condensation there.When accumulation of deposits exceedes threshold value, device produces and utilizes the bulky grain of higher relative percentages.Similarly, the granule of larger relative percentages is used in other cases.Alleviating fouled condition to allow to redesign air preheater with when shifting more heats without realizing when excessive fouling from flue, producing lower flue gas exit temperature.Therefrom extract more heats when the gas side of flue gas by reproducibility air heater, and the heat transfer surface of reproducibility air preheater device downstream does not become the device of excessive fouling or corrosion.But the method energy consumption wherein related to is high, industrialization cost is large, and technical difficulty is large, and exploitativeness is not good.Therefore in large-scale promotion application, there is larger obstruction.
Summary of the invention
The present invention is intended to solve the problems of the technologies described above, and provides a kind of acid regeneration unit waste gas residual heat to reclaim and exhaust treatment system, comprises graphite heat exchanger (1), water-circulating pump one (4), water-circulating pump two (3), pond (2) and cooling tower (5);
Wherein,
Graphite heat exchanger (1) is divided into two-stage,
Graphite heat exchanger first order top arranges waste gas inlet (11), and graphite heat exchanger first order lower wall arranges combustion air air inlet (13), and upper side wall arranges combustion air outlet (12);
Graphite heat exchanger second level lower sides arranges waste gas outlet (17), condensation wastewater outlet (18) is set bottom the second level, second level lower sides arranges water inlet (15), upper portion side wall sets out the mouth of a river (14), water inlet (15) is connected with the outlet (21) of pond (2) by water-circulating pump one (4), and delivery port (14) is connected with the import (22) of pond (2);
Another import (23) in pond (2) and cooling tower (5) outlet connect, and another outlet in pond is connected with cooling tower import (5) by water-circulating pump two (3).
Be preferably, graphite heat exchanger quantity is no less than one, and each graphite heat exchanger configures one group of water-circulating pump, often organize water-circulating pump have two, wherein one for subsequent use.
Be preferably, described water-circulating pump is provided with centrifugal pump of horizontal axis (31) and shaft coupling (33), and shaft coupling (33) outside is provided with coupling shield (32), the impeller of centrifugal pump of horizontal axis (31) is become by ultrahigh molecular weight polyethylene, molecular weight preferably 10,000-5 ten thousand, the shaft seal of shaft coupling (33) is sealed by Single Mechanical carborundum.
Be preferably, described graphite heat exchanger delivery port (14) arranges conductivity gauge, detect graphite heat exchanger with it whether leak damage for detecting Cl ion concentration in cooling water, graphite heat exchanger combustion air outlet (12) and waste gas outlet (17) set temperature meter and Pressure gauge.
The present invention also provides and utilizes above-mentioned acid regeneration unit waste gas residual heat recovery and exhaust treatment system to carry out the recovery of acid regeneration unit waste gas residual heat and waste gas processing method, and it comprises the steps:
1) waste gas after the process of acid regeneration unit is passed into graphite heat exchanger first order pipeline through graphite heat exchanger first order top waste gas inlet (11), combustion air is carried to graphite heat exchanger first order lower wall combustion air air inlet (13) by the combustion fan of acid regeneration unit, reduce toxic emission temperature by the temperature difference of the inner and outer walls of pipeline of graphite heat exchanger (1), after waste gas is cooled, enter the graphite heat exchanger second level; Combustion air temperature improves, then helps gas outlet (12) to be delivered to acid regeneration unit by the graphite heat exchanger first order;
2) pipeline of the graphite heat exchanger second level is entered through the cooled waste gas of the graphite heat exchanger first order, the cooling water in pond is delivered to graphite heat exchanger water inlet (15) through water-circulating pump one, for the waste gas in cooling pipe, steam in waste gas and HCl are cooled into bottom the liquid inflow graphite heat exchanger second level, flow into the water leg of acid regeneration unit for absorption tower absorbs water; All the other waste gas enter exhaust gas fan, are a liquid drop separator after exhaust gas fan, and here by gas and fluid separation applications, liquid is the separated water leg entered in the technological process of acid regeneration unit again, and remainder of exhaust gas becomes purified gas, enters air;
3) cooling water of graphite heat exchanger (1) passes through the delivery port (14) of graphite heat exchanger (1), and enter in pond (2), the water of pond (2) is sent into cooling tower (5) and carried out cooling down by the water-circulating pump two (3) be connected with pond (2).
Preferably, in step 1), graphite heat exchanger first order waste gas is cooled to 60 DEG C, and combustion air temperature brings up to 60 DEG C.
Preferably, the waste gas components of graphite heat exchanger first order top waste gas inlet 11 is: 50-60%H
2o (v%), 35-40%N
2(v%), 1-5%CO
2(v%), 1-5%O
2(v%), HCl content 15 ~ 50mg/Nm
3.
Preferably, the waste gas waste gas components of graphite heat exchanger first order top waste gas inlet 11 is: 56%H
2o (v%), 38%N
2(v%), 3%CO
2(v%), 3%O
2(v%), HCl content 15 ~ 50mg/Nm
3.
Preferably, 5700 m are vented
3/ h, steam≤10mg/Nm
3, HCl guarantee value :≤10mg/Nm
3.
Preferably, the waste gas of graphite heat exchanger first order top waste gas inlet 11 passes into speed is 0.3m
3/ min, it is 0.8m that combustion air air inlet 13 passes into speed
3/ min.
Preferably, the cool solidifying coolant-temperature gage being transported to graphite heat exchanger by pond controls at 10-20 DEG C, preferably 13 DEG C, and the water velocity of graphite heat exchanger water inlet 15 is 0.5m
3/ min.
Usefulness of the present invention:
The present invention can significantly reduce exhausting waste gas amount; and reclaim a large amount of water for industrial use; the resources of production that natural gas and electric power etc. are a large amount of can be saved; for reduced cost, enhance productivity; and the recovery of the resource such as heat energy, environmental protection and water and soil conservation etc. are all very meaningful, have good facilitation.
Accompanying drawing explanation
Figure 1 shows that the structural representation of a preferred embodiment of the present invention.
Detailed description of the invention
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent.
Below in conjunction with the Figure of description in the present invention, be clearly and completely described the technical scheme in invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Be illustrated in figure 1 the acid regeneration unit waste gas residual heat that can be used as present pre-ferred embodiments to reclaim and exhaust treatment system, it is characterized in that, comprise graphite heat exchanger (1), water-circulating pump one (4), water-circulating pump two (3), pond (2) and cooling tower (5);
Wherein,
Graphite heat exchanger (1) is divided into two-stage,
Graphite heat exchanger first order top arranges waste gas inlet (11), and graphite heat exchanger first order lower wall arranges combustion air air inlet (13), and upper side wall arranges combustion air outlet (12);
Graphite heat exchanger second level lower sides arranges waste gas outlet (17), condensation wastewater outlet (18) is set bottom the second level, second level lower sides arranges water inlet (15), upper portion side wall sets out the mouth of a river (14), water inlet (15) is connected with the outlet (21) of pond (2) by water-circulating pump one (4), and delivery port (14) is connected with the import (22) of pond (2);
Another import (23) in pond (2) and cooling tower (5) outlet connect, and another outlet in pond is connected with cooling tower import (5) by water-circulating pump two (3).
Graphite heat exchanger quantity is no less than one, and each graphite heat exchanger configures one group of water-circulating pump, often organize water-circulating pump have two, wherein one for subsequent use.
Be preferably, described water-circulating pump is provided with centrifugal pump of horizontal axis (31) and shaft coupling (33), and shaft coupling (33) outside is provided with coupling shield (32), the impeller of centrifugal pump of horizontal axis (31) is become by ultrahigh molecular weight polyethylene, molecular weight preferably 10,000-5 ten thousand, the shaft seal of shaft coupling (33) is sealed by Single Mechanical carborundum.
Be preferably, described graphite heat exchanger delivery port (14) arranges conductivity gauge, detect graphite heat exchanger with it whether leak damage for detecting Cl ion concentration in cooling water, graphite heat exchanger combustion air outlet (12) and waste gas outlet (17) set temperature meter and Pressure gauge.
Graphite heat exchanger is for reclaiming the water vapour of heat energy and condensation torrefaction waste gas.Upper and lower two-stage is divided in graphite heat exchanger.The first order of graphite heat exchanger and the second level are equipped with the tubular heat exchanger be made up of graphite-pipe, and its effect is used to refrigerating gas and reduces EGT, reaches the object reclaiming heat energy, HCI and water.
Graphite heat exchanger first order top arranges waste gas inlet, and graphite heat exchanger first order lower wall arranges combustion air air inlet, and upper side wall arranges combustion air gas outlet; The heat energy in waste gas is reclaimed on the top of graphite heat exchanger by combustion air heat exchange.Water in pond is sent in the second level water inlet of each graphite heat exchanger by the graphite heat exchanger water-circulating pump one connected with graphite heat exchanger, indirectly cools waste gas.
Moisture content and the HCI carried secretly are reclaimed by the steam in condensation waste gas in the second level of graphite heat exchanger, condensation wastewater outlet is set bottom the graphite heat exchanger second level, the moisture content that the graphite heat exchanger second level is reclaimed and HCI enter the water leg in the technological process of acid regeneration unit by condensation wastewater outlet bottom graphite heat exchanger, the water that water leg is collected is absorbed by the absorption tower in the technological process of acid regeneration unit and uses, and the HCl of recovery enters absorption tower with water and generates regenerated acid and return pickling unit and recycle.
Wherein, the leakage damaged condition of Cl ion concentration in cooling water and graphite heat exchanger water-circulating pump is detected by conductivity gauge, described graphite heat exchanger delivery port arranges conductivity gauge, detect graphite heat exchanger with it whether leak damage for detecting Cl ion concentration in cooling water, the outlet of graphite heat exchanger combustion air and waste gas outlet set temperature meter and Pressure gauge.
The acid regeneration unit waste gas residual heat carrying out implementing based on said system reclaims and waste gas processing method, comprises the steps:
1) waste gas after the process of acid regeneration unit is passed into graphite heat exchanger first order pipeline through graphite heat exchanger first order top waste gas inlet (11), combustion air is carried to graphite heat exchanger first order lower wall combustion air air inlet (13) by the combustion fan of acid regeneration unit, reduce toxic emission temperature by the temperature difference of the inner and outer walls of pipeline of graphite heat exchanger (1), after waste gas is cooled, enter the graphite heat exchanger second level; Combustion air temperature improves, then helps gas outlet (12) to be delivered to acid regeneration unit by the graphite heat exchanger first order;
In the present embodiment, make from left side first group of graphite heat exchanger top input from the roaster waste gas of old acid regeneration unit, bottom exports the exhaust gas fan of roaster waste gas to old acid regeneration unit; In combustion air inlet, carry combustion air by the combustion fan of old acid regeneration unit, carry combustion air to the burner of old acid regeneration unit by combustion air outlet simultaneously.
In the present embodiment, make second group of graphite heat exchanger top input from left side from the roaster waste gas on eo-acid regeneration unit absorption tower, bottom exports the exhaust gas fan of roaster waste gas to eo-acid regeneration unit; In combustion air inlet, carry combustion air by the combustion fan of eo-acid regeneration unit, regenerated the burner of unit simultaneously by combustion air outlet conveying combustion air to eo-acid.
By the heat energy of the first order in combustion air heat exchange recovery waste gas of each graphite heat exchanger, help hot-air to play the effect of cooling medium, in the process, waste gas is cooled to 60 DEG C, and combustion air temperature brings up to 60 DEG C; Then, waste gas enters the second level of graphite heat exchanger.
2) pipeline of the graphite heat exchanger second level is entered through the cooled waste gas of the graphite heat exchanger first order, the cooling water in pond is delivered to graphite heat exchanger water inlet (15) through water-circulating pump one, for the waste gas in cooling pipe, steam in waste gas and HCl are cooled into bottom the liquid inflow graphite heat exchanger second level, flow into the water leg of acid regeneration unit for absorption tower absorbs water; All the other waste gas enter exhaust gas fan, are a liquid drop separator after exhaust gas fan, and here by gas and fluid separation applications, liquid is the separated water leg entered in the technological process of acid regeneration unit again, and remainder of exhaust gas becomes purified gas, enters air;
3) cooling water of graphite heat exchanger (1) passes through the delivery port (14) of graphite heat exchanger (1), and enter in pond (2), the water of pond (2) is sent into cooling tower (5) and carried out cooling down by the water-circulating pump two (3) be connected with pond (2).
It is 0.3 m that the waste gas of graphite heat exchanger first order top waste gas inlet passes into speed
3/ min, it is 0.8 m that combustion air air inlet passes into speed
3/ min, the water velocity of graphite heat exchanger water inlet is 0.5 m
3/ min.
The cool solidifying coolant-temperature gage being transported to graphite heat exchanger by pond controls at 10-20 DEG C, preferably 13 DEG C, and the water velocity of graphite heat exchanger water inlet is 0.5m
3/ min.
In existing production, often regenerate 1m
3spent acid, produces about 2100Nm
3(about 4000m under work condition state
3) torrefaction waste gas.The weight coefficient of waste gas constituent is as follows: the H of about 56%
2o (v%); The N of about 38%
2(v%); The CO of about 3%
2(v%); The O of about 3%
2(v%); Meanwhile, waste gas comprises 15 ~ 50mg/Nm
3hCl, EGT is generally 75 DEG C.
These contain after a large amount of steam and micro-HCl be dispersed to surrounding environment with toxic emission, can cause environmental pollution, therefore, recycle these resources, reclaim heat energy, energy-saving and emission-reduction, pollution abatement.Resource reclaim, environmental protection and water and soil conservation are all become very meaningful.
With regard to economic implications, one is produced per year to the acid-cleaning plate pickling unit of 1,200,000 tons, it gives off 3.65 ten thousand m every year
3spent acid, discharges steam along band and is about 3.65 ten thousand m
3, therefore, reclaim this part water and heat resource has very large economic implications.
For annual output 1200000 tons of cold-rolling pickling board assembly lines, former designing and arranging tolerance is 24000 m
3/ h, the capacity after application the present invention is 8550m
3/ h, essentially eliminates steam, has reduced discharging 15450m
3/ h; In addition, HCI≤10mg/Nm is discharged
3, compare the 20mg/Nm that GB GB28665-2012 specifies
3reduce many.Comprehensive, the present invention reduces discharging 1560Kg exhausted air quantity every year, simultaneously 39000 tons, recyclable water.Accordingly, the present invention can save natural gas 97500Nm every year
3.Meanwhile, owing to having peeled off steam, so need the material mass blowed to diminish, and then power has also tailed off; Therefore the present invention can make the operate power of exhaust gas fan reduce by 30 ~ 50%, adds up to annual saving electricity 1023750 degree.
In sum, obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (9)
1. acid regeneration unit waste gas residual heat reclaims and exhaust treatment system, it is characterized in that, comprises graphite heat exchanger (1), water-circulating pump one (4), water-circulating pump two (3), pond (2) and cooling tower (5);
Wherein,
Graphite heat exchanger (1) is divided into two-stage,
Graphite heat exchanger first order top arranges waste gas inlet (11), and graphite heat exchanger first order lower wall arranges combustion air air inlet (13), and upper side wall arranges combustion air outlet (12);
Graphite heat exchanger second level lower sides arranges waste gas outlet (17), condensation wastewater outlet (18) is set bottom the second level, second level lower sides arranges water inlet (15), upper portion side wall sets out the mouth of a river (14), water inlet (15) is connected with the outlet (21) of pond (2) by water-circulating pump one (4), and delivery port (14) is connected with the import (22) of pond (2);
Another import (23) in pond (2) and cooling tower (5) outlet connect, and another outlet in pond is connected with cooling tower import (5) by water-circulating pump two (3).
2. acid regeneration unit waste gas residual heat according to claim 1 reclaims and exhaust treatment system, and it is characterized in that, graphite heat exchanger quantity is no less than one group, and each graphite heat exchanger configures one group of water-circulating pump.
3. acid regeneration unit waste gas residual heat according to claim 1 reclaims and exhaust treatment system, it is characterized in that, described water-circulating pump (3) is provided with centrifugal pump of horizontal axis (31) and shaft coupling (33), and shaft coupling (33) outside is provided with coupling shield (32), the impeller of centrifugal pump of horizontal axis (31) is become by ultrahigh molecular weight polyethylene, and the shaft seal of shaft coupling (33) is sealed by Single Mechanical carborundum.
4. acid regeneration unit waste gas residual heat according to claim 1 reclaims and exhaust treatment system, it is characterized in that, described graphite heat exchanger delivery port (14) arranges conductivity gauge, detect graphite heat exchanger with it whether leak damage for detecting Cl ion concentration in cooling water, graphite heat exchanger combustion air outlet (12) and waste gas outlet (17) set temperature meter and Pressure gauge.
5. utilize the arbitrary described acid regeneration unit waste gas residual heat recovery of claim 1 ~ 4 and exhaust treatment system to carry out acid regeneration unit waste gas residual heat to reclaim and waste gas processing method, it is characterized in that, it comprises the steps:
1) waste gas after the process of acid regeneration unit is passed into graphite heat exchanger first order pipeline through graphite heat exchanger first order top waste gas inlet (11), combustion air is carried to graphite heat exchanger first order lower wall combustion air air inlet (13) by the combustion fan of acid regeneration unit, reduce toxic emission temperature by the temperature difference of the inner and outer walls of pipeline of graphite heat exchanger (1), after waste gas is cooled, enter the graphite heat exchanger second level; Combustion air temperature improves, then helps gas outlet (12) to be delivered to acid regeneration unit by the graphite heat exchanger first order;
2) graphite heat exchanger second level pipeline is entered through the cooled waste gas of the graphite heat exchanger first order, the cooling water in pond is delivered to graphite heat exchanger water inlet (15) through water-circulating pump one, for the waste gas in cooling pipe, steam in waste gas and HCl are cooled into condensation wastewater outlet (18) bottom liquid flow to the graphite heat exchanger second level, flow into the water leg of acid regeneration unit for absorption tower absorbs water; All the other waste gas enter exhaust gas fan, are a liquid drop separator after exhaust gas fan, and here by gas and fluid separation applications, liquid is the separated water leg entered in the technological process of acid regeneration unit again, and remainder of exhaust gas becomes purified gas, enters air;
3) cooling water of graphite heat exchanger (1) passes through the delivery port (14) of graphite heat exchanger (1), and enter in pond (2), the water of pond (2) is sent into cooling tower (5) and carried out cooling down by the water-circulating pump two (3) be connected with pond (2).
6. acid regeneration unit waste gas residual heat according to claim 5 reclaims and waste gas processing method, and it is characterized in that, waste gas is cooled to 60 DEG C, and combustion air temperature brings up to 60 DEG C.
7. acid regeneration unit waste gas residual heat according to claim 5 reclaims and waste gas processing method, and it is characterized in that, waste gas components is: 50-60%H
2o (v%), 35-40%N
2(v%), 1-5%CO
2(v%), 1-5%O
2(v%), HCl content 15 ~ 50mg/Nm
3.
8. acid regeneration unit waste gas residual heat according to claim 5 reclaims and waste gas processing method, and it is characterized in that, waste gas components is: 56%H
2o (v%), 38%N
2(v%), 3%CO
2(v%), 3%O
2(v%), HCl content 15 ~ 50mg/Nm
3.
9. acid regeneration unit waste gas residual heat according to claim 5 reclaims and waste gas processing method, it is characterized in that, is vented 5700 m
3/ h, steam≤10mg/Nm
3, HCl guarantee value :≤10mg/Nm
3.
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Cited By (6)
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| CN105036079A (en) * | 2015-06-12 | 2015-11-11 | 德州实华化工有限公司 | System and method for improving heat exchange effects of graphite blocks in HCl synthetic furnace with byproduct steam |
| CN107311287A (en) * | 2017-09-02 | 2017-11-03 | 河北天创管业有限公司 | A kind of method for treating waste liquid and device based on acid regeneration process |
| CN110102151A (en) * | 2019-03-29 | 2019-08-09 | 中冶南方工程技术有限公司 | Energy saving and environment friendly oxidate powder transportation system and its operational method in spray roasting |
| CN111298602A (en) * | 2020-02-25 | 2020-06-19 | 新冶高科技集团有限公司 | Pickling acid regeneration combined energy-saving emission-reducing waste heat utilization system and method |
| CN112964079A (en) * | 2021-03-25 | 2021-06-15 | 天津海钢板材有限公司 | Flue gas recovery heat exchange device and heat exchange method for acid regeneration unit |
| CN115350565A (en) * | 2022-07-12 | 2022-11-18 | 绍兴明业化纤有限公司 | Efficient sulfuric acid waste heat recovery equipment and recovery process thereof |
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