CN101100290A - Multi-tower type sulfuric acid low temperature heat energy recovering method and device thereof - Google Patents
Multi-tower type sulfuric acid low temperature heat energy recovering method and device thereof Download PDFInfo
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- CN101100290A CN101100290A CNA2007100938712A CN200710093871A CN101100290A CN 101100290 A CN101100290 A CN 101100290A CN A2007100938712 A CNA2007100938712 A CN A2007100938712A CN 200710093871 A CN200710093871 A CN 200710093871A CN 101100290 A CN101100290 A CN 101100290A
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- sulfuric acid
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—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
- 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
This invention relates to method for recovering low temperature level heat energy from sulfuric acid production multiple-towers, and the equipment therefore. The equipment is composed of: sulfuric acid production installation (SAPI), with the outlet connecting a low temperature recovery absorption tower (LTRAT); the outlet of the bottom of LTRAT is connected with a combined acid circulation tank (CACT); the top outlet is connected with the inlet of absorption tower of the SAPI; the CACT is connected with the inlet of evaporator by a high temperature sulfuric acid pump; the outlet of the evaporator is connected with the inlets of a acid cooling unit (ACU) and dilution unit (DU); the outlet of DU is connected with high level inlet of LTRAT; the outlet of the ACU is connected with the other inlet of the evaporator; the other inlets of ACU and DU is connected with feeding water tubes. This invention method can be used for multiple set of small scale sulfuric acid production units to recover low temperature level heat energy, solving the problem of long term returns on investment in prior art independent heat recovery units.
Description
Technical field
The present invention relates to the recovery method and the device thereof of multi-tower type sulfuric acid low temperature heat energy.
Background technology
In recent years, along with world's conventional energy resources day is becoming tight, people more and more pay attention to the utilization of the energy.Sulfuric acid plant is to the title that energy factory is arranged, but the domestic heat energy that burns the sulphur transform portion that is in high potential temperature of only having recycled is for a long time taken away and wasted and still is recycled water coolant for the low-temperature heat energy of doing the suction part.Although the U.S. Meng Shan neat HEROS technology of HRS technology and German Shandong all of successful Application has abroad been arranged, be used for single sulfuric acid apparatus and reclaim the low-temperature heat energy of doing the suction part, the heat energy recycle rate of sulfuric acid plant is brought up to more than 90%.But domestic present situation is that most to have built up the sulfuric acid apparatus scale all little, though reclaiming to use, the low temperature of single sulfuric acid apparatus has been applied to industrial production, benefit is very obvious, but the construction cost of low temperature retrieving arrangement is quite expensive, this will the payback period occur for the small-scale sulfuric acid apparatus of many covers is built the low temperature recovery respectively long, or situation about all can not recoup capital outlay in design service life.
Summary of the invention
Technical problem to be solved by this invention is: at the defective that above-mentioned prior art exists, provide that a kind of cost is low, heat energy utilization rate height, be applicable to that many covers are concentrated on a small scale or the recovery method and the device thereof of the sulfuric acid low temperature heat energy of the sulfuric acid apparatus of intensive construction.
A technical scheme of the present invention is:
The retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy, comprise that the low temperature that links to each other with the exit end of sulfuric acid apparatus reclaims the absorption tower, the exit end of each sulfuric acid apparatus is equipped with a low temperature and reclaims the absorption tower, the outlet at bottom end that described low temperature reclaims the absorption tower links to each other with the composite acid circulation groove, and the top exit end links to each other with the entrance end on absorption tower in the described sulfuric acid apparatus respectively; Described composite acid circulation groove links to each other with an entrance end of vaporizer by the high-temperature concentrated sulfuric acid pump; One exit end of described vaporizer links to each other with an entrance end of acid cooler and diluter respectively; The exit end of described diluter links to each other with the high-order entrance end that described low temperature reclaims the absorption tower; One exit end of described acid cooler links to each other with another entrance end of described vaporizer; Another import of described acid cooler and diluter links to each other with filling pipe respectively.
The top exit end that described low temperature reclaims the absorption tower links to each other with the entrance end on absorption tower in the described sulfuric acid apparatus respectively by a valve; The exit end of described sulfuric acid apparatus links to each other with the entrance end on absorption tower in the described sulfuric acid apparatus with the bottom inlet end that described low temperature reclaims the absorption tower by by-pass valve respectively.
Another exit end of described acid cooler links to each other with the circulation groove on absorption tower in the described sulfuric acid apparatus.
Described low temperature reclaims the absorption tower and is the material filling type absorption tower.
Another technical scheme of the present invention is:
A kind of method of utilizing the described device reclaim(ed) sulfuric acid of claim 1 low-temperature heat energy may further comprise the steps:
1) furnace gas temperature of a plurality of low temperature recovery of control absorption tower top exit end is about 180～200 ℃;
2) control high-temperature concentrated sulfuric acid pump discharge vitriolic temperature is 200～220 ℃, and concentration is 99.3～99.6%;
3) temperature of control evaporator outlet acid is 180～200 ℃, and vitriolic concentration is 98.5～99.3% behind the diluter;
4) 100～104 ℃ of deaerated water are adopted in moisturizing.
According to the low temperature recovery absorption tower that the quantity of sulfuric acid apparatus disposes equivalent amount, the outlet at bottom end that described low temperature reclaims the absorption tower all links to each other with the composite acid circulation groove.
Beneficial effect of the present invention:
The present invention designs a plurality of low temperature recovery absorption tower according to the quantity of sulfuric acid apparatus, because each tower is corresponding to a sulfuric acid apparatus independently, so many covers sulfuric acid apparatus of gang can be affected original system process parameter owing to other a plurality of low temperature reclaim incorporating into of absorption tower, can reduce simultaneously the investment of single cover sulfuric acid apparatus configuration low temperature retrieving arrangement again, and the heat energy utilization rate of the sulfuric acid apparatus of associating is all brought up to more than 90%.
Now in conjunction with the embodiments and accompanying drawing the invention will be further described.
Description of drawings
The process flow diagram that Fig. 1 reclaims for multi-tower type sulfuric acid low temperature heat energy.
Embodiment
With reference to the accompanying drawings, the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy is mainly a plurality of low temperature and reclaims the absorption tower, is used for sulfuric acid and SO
3Mass-and heat-transfer; A vaporizer is used for high-temperature concentrated sulfuric acid and deaerated water heat exchange, produces low-pressure steam; A diluter is used for adding water to high-temperature concentrated sulfuric acid, regulates sulfuric acid concentration; A composite acid circulation groove as the storage tank of recycle acid, also is used for each low temperature and reclaims tower acid mixing under the absorption tower; A high-temperature concentrated sulfuric acid pump provides sour round-robin power; An acid cooler is used for the heating fumigators feedwater.Low temperature reclaims the quantity of the corresponding sulfuric acid apparatus that merges of quantity on absorption tower; The form that each low temperature reclaims the absorption tower is the material filling type absorption tower, and its structure is similar to a suction tower structure of sulfuric acid apparatus, and the material that is adopted is the steel alloy of high temperature resistant high-concentration sulfuric acid.Vaporizer adopts " kettle-type reboiler " structure among the GB151-1999, and material adopts the steel alloy of high temperature resistant high-concentration sulfuric acid.Acid cooler adopts " fixed tube-sheet heat exchanger " structure among the GB151-1999, and material adopts the steel alloy of high temperature resistant high-concentration sulfuric acid.The Combined Cycle groove is general horizontal storage tank, and material adopts the steel alloy of high temperature resistant high-concentration sulfuric acid.The diluter structure be patent No. ZL200520043014.8's " high-temperature concentrated sulfuric acid diluter ".The high-temperature concentrated sulfuric acid pump is the commercially available prod.Low temperature reclaims the absorption tower and is connected with the sulfuric acid apparatus parallel type.The retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy is realized overlapping being connected and disconnection of sulfuric acid apparatus with by the switch of flue gas master, by-pass valve more, thereby when making the retrieving arrangement fault of multi-tower type sulfuric acid low temperature heat energy or the sulfuric acid apparatus fault of the retrieving arrangement that any cover is connected to multi-tower type sulfuric acid low temperature heat energy, can not influence the normal operation of other devices.
The technical process that multi-tower type sulfuric acid low temperature heat energy reclaims:
With reference to the accompanying drawings, transform once from each cover sulfuric acid apparatus that the back is former advances a SO that contains that inhales tower
3Flue gas enters corresponding low temperature recovery absorption tower by the control of valve, enters a suction tower that respectively overlaps sulfuric acid apparatus after the recycle sulfuric acid of high-temperature high concentration absorbs.The recycle sulfuric acid of high-temperature high concentration is sent into vaporizer by the high-temperature concentrated sulfuric acid pump in the composite acid circulation groove, with the deaerated water heat exchange in the vaporizer, make the interior water of vaporizer become the saturation steam of 0.4～1.0MPa; The high-temperature high concentration recycle sulfuric acid of lowering the temperature after the heat exchange enters diluter, and thin up in diluter is divided into several roads and enters each low temperature recovery absorption tower respectively after the adjusting concentration, absorb the SO in the flue gas in tower
3After get back to the composite acid circulation groove, be pumped to vaporizer by high-temperature concentrated sulfuric acid again after in the Combined Cycle groove, mixing, according to this circulation.Through the sulfuric acid after the vaporizer cooling, a part enters acid cooler, and the heating fumigators moisturizing enters each sulfuric acid apparatus respectively after the heat exchange cooling.
If the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy stops, then close each turnover low temperature and reclaim the gas fume valve on absorption tower, open by-pass valve and get final product, can not influence the production of the device that links to each other.If a certain cover or a few covering device need stop or stop to enter the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy in the sulfuric acid apparatus, then close the corresponding low temperature of turnover and reclaim the gas fume valve on absorption tower, open corresponding by-pass valve and get final product, can not influence the continuous production of retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy and the continuous production of other sulfuric acid apparatus.
The furnace gas temperature that each low temperature of retrieving arrangement that advances multi-tower type sulfuric acid low temperature heat energy reclaims the absorption tower and ortho-sulfuric acid device once transform laggard one to inhale the tower furnace gas temperature consistent, and the furnace gas temperature that goes out low temperature recovery absorption tower is about 180～200 ℃.High-temperature concentrated sulfuric acid pump discharge vitriolic temperature is 200～220 ℃, and concentration is 99.3～99.6%.The temperature of evaporator outlet acid is 180～200 ℃, and sulfuric acid concentration is with the high-temperature concentrated sulfuric acid pump discharge.The ortho-sulfuric acid device is done and is inhaled the diluter that the moisturizing of part technology partly moves into multi-tower type low temperature retrieving arrangement, and the vitriolic temperature is 180～200 ℃ behind the diluter, and concentration is 98.5～99.3%, and each sulfuric acid apparatus is done and inhaled the corresponding minimizing of part technology moisturizing.Vaporizer is produced pressure 0.4～1.0Mpa, 151～184 ℃ of saturation steams of temperature in the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy.The retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy need be increased to confession vaporizer about 130～150 ℃ through the acid cooler temperature after heating with 100～104 ℃ of deaerated water, and output is 110～130 ℃ after the heat exchange, enters each sulfuric acid apparatus behind 99.3～99.6% sulfuric acid respectively.The retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy need be used recirculated water, and temperature and water quality do not have particular requirement, and available sulfuric acid apparatus is done and inhaled part recirculated water.Multi-tower type low temperature retrieving arrangement drives to need to increase the about 3.0KPa of resistance drop, but the former suction tower of each sulfuric acid apparatus can reduce spray flux, and resistance drop slightly descends.
Embodiment
100,000 tons of/year sulfuric acid apparatus of one cover, 200,000 tons of/year sulfuric acid apparatus of two covers merge the retrieving arrangement of building three-in-one multi-tower type sulfuric acid low temperature heat energy.The temperature of advancing the flue gas on each low temperature recovery absorption tower is 175 ℃, and the temperature that goes out the flue gas on each low temperature recovery absorption tower is 195 ℃.The vitriolic acid flux of high-temperature concentrated sulfuric acid pump discharge is 1020m
3/ h, temperature is 210 ℃, concentration is 99.6%.Constant through vitriolic flow behind the vaporizer, concentration, temperature is reduced to 190 ℃.The vitriolic acid flux that enters diluter is 990m3/h, and temperature is 190 ℃, and the diluter rate of water make-up is 10.5T/h, and diluter outlet vitriolic flow is 1000m
3/ h, concentration is 99.0%, temperature is 195 ℃.The evaporator outlet part high-temperature high concentration vitriol oil enters acid cooler, and after deaerated water heat exchange cooling, temperature is reduced to 130 ℃, and concentration is constant, enters three cover sulfuric acid apparatus respectively, and total flux is 55.5T/h.Heat exchange is warming up to 132 ℃ to 104 ℃ of deaerated water through acid cooler, enters vaporizer, and flow is 32T/h.Vaporizer produces 0.8MPa low-pressure saturated steam 28.7T/h.It is 32 ℃ that device needs to use recirculated water 30T/h, inflow temperature, and return water temperature is 40 ℃, and water quality is river.Former 100,000 tons of/year sulfuric acid apparatus pressure drops increase 2.8KPa, and 200,000 tons of/year sulfuric acid apparatus pressure drops of two covers increase to 3.2KPa and 3.4KPa.
Claims (6)
1, the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy, comprise that the low temperature that links to each other with the exit end of sulfuric acid apparatus reclaims the absorption tower, it is characterized in that: the exit end of each sulfuric acid apparatus is equipped with a low temperature and reclaims the absorption tower, the outlet at bottom end that described low temperature reclaims the absorption tower links to each other with the composite acid circulation groove, and the top exit end links to each other with the entrance end on absorption tower in the described sulfuric acid apparatus respectively; Described composite acid circulation groove links to each other with an entrance end of vaporizer by the high-temperature concentrated sulfuric acid pump; One exit end of described vaporizer links to each other with an entrance end of acid cooler and diluter respectively; The exit end of described diluter links to each other with the high-order entrance end that described low temperature reclaims the absorption tower; One exit end of described acid cooler links to each other with another entrance end of described vaporizer; Another import of described acid cooler and diluter links to each other with filling pipe respectively.
2, the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy according to claim 1 is characterized in that: the top exit end that described low temperature reclaims the absorption tower links to each other with the entrance end on absorption tower in the described sulfuric acid apparatus respectively by a valve; The exit end of described sulfuric acid apparatus links to each other with the entrance end on absorption tower in the described sulfuric acid apparatus with the bottom inlet end that described low temperature reclaims the absorption tower by by-pass valve respectively.
3, the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy according to claim 1 and 2 is characterized in that: another exit end of described acid cooler links to each other with the circulation groove on absorption tower in the described sulfuric acid apparatus.
4, the retrieving arrangement of multi-tower type sulfuric acid low temperature heat energy according to claim 1 and 2 is characterized in that: described low temperature reclaims the absorption tower and is the material filling type absorption tower.
5, a kind of method of utilizing the described device reclaim(ed) sulfuric acid of claim 1 low-temperature heat energy may further comprise the steps:
1) furnace gas temperature of a plurality of low temperature recovery of control absorption tower top exit end is about 180～200 ℃;
2) control high-temperature concentrated sulfuric acid pump discharge vitriolic temperature is 200～220 ℃, and concentration is 99.3～99.6%;
3) temperature of control evaporator outlet acid is 180～200 ℃, and vitriolic concentration is 98.5～99.3% behind the diluter;
4) 100～104 ℃ of deaerated water are adopted in moisturizing.
6, the method for reclaim(ed) sulfuric acid low-temperature heat energy according to claim 5 is characterized in that: according to the low temperature recovery absorption tower that the quantity of sulfuric acid apparatus disposes equivalent amount, the outlet at bottom end that described low temperature reclaims the absorption tower all links to each other with the composite acid circulation groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100938712A CN101100290A (en) | 2007-06-21 | 2007-06-21 | Multi-tower type sulfuric acid low temperature heat energy recovering method and device thereof |
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| CNA2007100938712A CN101100290A (en) | 2007-06-21 | 2007-06-21 | Multi-tower type sulfuric acid low temperature heat energy recovering method and device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353283A (en) * | 2011-10-08 | 2012-02-15 | 上海奥格利环保工程有限公司 | Device for recovering heat of low-temperature level absorption reaction during preparing sulfuric acid |
| CN102380218A (en) * | 2011-09-29 | 2012-03-21 | 上海奥格利环保工程有限公司 | Vertical evaporator with gravity assisted heat tubes for production of sulfuric acid |
| CN103318850A (en) * | 2013-07-17 | 2013-09-25 | 上海奥格利环保工程有限公司 | Low-temperature waste heat recovery system for pyrite and metallurgical off-gas acid making device |
-
2007
- 2007-06-21 CN CNA2007100938712A patent/CN101100290A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102380218A (en) * | 2011-09-29 | 2012-03-21 | 上海奥格利环保工程有限公司 | Vertical evaporator with gravity assisted heat tubes for production of sulfuric acid |
| CN102353283A (en) * | 2011-10-08 | 2012-02-15 | 上海奥格利环保工程有限公司 | Device for recovering heat of low-temperature level absorption reaction during preparing sulfuric acid |
| CN103318850A (en) * | 2013-07-17 | 2013-09-25 | 上海奥格利环保工程有限公司 | Low-temperature waste heat recovery system for pyrite and metallurgical off-gas acid making device |
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