CN101781998B - Method for recovering low-temperature level heat energy in acid making in sulfuric acid production - Google Patents
Method for recovering low-temperature level heat energy in acid making in sulfuric acid production Download PDFInfo
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- CN101781998B CN101781998B CN2009101029970A CN200910102997A CN101781998B CN 101781998 B CN101781998 B CN 101781998B CN 2009101029970 A CN2009101029970 A CN 2009101029970A CN 200910102997 A CN200910102997 A CN 200910102997A CN 101781998 B CN101781998 B CN 101781998B
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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
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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
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention discloses a method for recovering low-temperature level heat energy in acid making in sulfuric acid production. A heat energy recovery device consists of a screw expansion generating set, a circulating pump and a desalted water heater; high temperature circulating acid out of an absorption tower in the acid making procedure is introduced into the desalted water heater and subjected to heat exchange and temperature reduction, and then returns to the system for circular absorption, and the heat energy released is brought out by deoxidized and desalted water; the deoxidized and desalted water is heated, enters a working medium heater, releases heat and exchanges heat through a pipeline pump; a working medium with low boiling point indirectly exchanges heat with the desalted water, or the working medium with the low boiling point indirectly exchanges heat with sulfuric acid directly; the working medium is heated, evaporated and boosted, and then generates power through the screw expansion generating set or directly drags other equipment; and the working medium is continuously circulated, and the low-temperature level heat energy of the circulating acid is recovered. The method can save power consumption of circulating cooling water, reduce water supplement quantity of the circulating water, recover the heat energy and is suitable for sulfuric acid manufacturers using sulfur or brasses as a raw material.
Description
Technical field
The present invention relates to sulfuric acid, relate in particular to relieving haperacidity operation method for recovering low-temperature level heat energy in the sulphuric acid process.
Background technique
In the sulphuric acid process; Relieving haperacidity workshop section low-temperature heat energy overwhelming majority device adopts recirculated cooling water that it is taken away; This heat accounts for 30% of gross calorific power in the sulphuric acid process, so not only consumes a large amount of circulating water and corresponding power, and has caused the loss of low-temperature heat energy.
For recycling this heat; Researcher is constantly attempted various effective ways both at home and abroad; To so far, comparatively ripe relieving haperacidity low-temperature heat energy reclaims technology " HRS " system for the exploitation of U.S. Monsanto Company, produces the low-pressure saturated steam of 0.4～1.0MPa behind the recyclable relieving haperacidity low-temperature heat energy of this system; About 0.4～0.6t/t the acid of sulphur-burning sulphuric acid plant steam generating capacity, the about 0.2～0.35t/t acid of pyrite-based sulfuric acid production device steam generating capacity.But this system has following shortcoming:
1) investment is huge; The transformation of 400kt/a sulphur-burning sulphuric acid plant needs about 5,000 ten thousand yuan;
2) it is too narrow to control scope; This matching requirements relieving haperacidity acid is dense to be operated between being controlled at 99%～100%, otherwise will produce violent corrosion, and the device load frequently is difficult to reach so high controlling level in the present domestic gas washing in SA production;
3) the legacy system transformation needs extra increase 4kPa left and right sides drag losses, receives the restriction of original device sulfur dioxide main air blower pressure head, and most sulfuric acid plants are difficult to carry out transformation;
4) application is very slow, and this technology is for occurring about the eighties in last century, and domestic so far only have the sulphur-burning sulphuric acid plant in Suzhou to quote this technology and reach outside the stable operation, and all the other still do not have relevant utilization report.
Summary of the invention
The object of the present invention is to provide relieving haperacidity method for recovering low-temperature level heat energy in the gas washing in SA production, to solve the very difficult problem that reclaims of relieving haperacidity operation low-temperature heat energy in the sulphuric acid process.
This problem is when gas washing in SA production; All to circulate with acid in relieving haperacidity workshop section tower drier, first absorption tower, second absorption tower; Recycle acid is taken a large amount of reaction heat, gas cooling released heat, the heat of dilution, mixed heat etc. out of, goes out the tower acid temperature and is respectively 70 ℃, 104 ℃, 86 ℃.In order to improve the index of aridity and absorptivity, must be respectively carry out drying and absorption with going into tower behind the recycle acid temperature drop to 50 ℃, 80 ℃, 70 ℃.Recycle acid is cooled, reclaim a large amount of low-temperature heat energies again as far as possible.
For this reason, the inventor is to when gas washing in SA production, and the recovery of relieving haperacidity workshop section tower drier, first absorption tower, the second absorption tower recycle acid heat provides following technological scheme:
Relieving haperacidity method for recovering low-temperature level heat energy in the gas washing in SA production of the present invention is by screw expansion motor group 4, and the pipeline mounted pump of circulation usefulness 6 and demineralized water heater 1 connect to form heat-energy recovering apparatus through pipeline; Wherein demineralized water heater 1 connects into a loop through the pipeline mounted pump 6 of working medium heater in the pipeline connecting screw rod expansion motive power machine group 8 and circulation usefulness; The demineralized water heater is introduced in the high temperature circulation acid that will go out tower from relieving haperacidity operation absorption tower; Through heat exchange, the recycle acid concentrated sulphuric scid 7 is through between the pipe of demineralized water heater 1, and deoxygenation demineralized water 2 is walked in the pipe; The system of the concentrated sulphuric scid 7 getting back to after by the cooling absorption that circulates, institute's liberated heat is taken out of by the deoxygenation demineralized water; The deoxygenation demineralized water is heated the cycle fluid heater 8 that the back gets into the screw expansion motor group, through the pipeline mounted pump circulation, realizes cycle heat exchange after the heat release; Low boiling working fluid and demineralized water adopt indirect heat exchange; Or directly use low boiling working fluid and sulfuric acid indirect heat exchange; Evaporate after low boiling working fluid is heated, boost; Realize generating or directly drag other motive force equipment that working medium continues circulation, thereby reach the relieving haperacidity low-temperature heat energy is effectively reclaimed then through screw expansion motor.
Relieving haperacidity method for recovering low-temperature level heat energy in the above-mentioned gas washing in SA production, wherein the screw expansion motor group comprises working medium heater, working medium condenser, screw expansion motor, generator and electric appearance control system.
Relieving haperacidity method for recovering low-temperature level heat energy in the above-mentioned gas washing in SA production, the temperature of high temperature circulation acid wherein is 104 ℃ ± 8 ℃, recycle acid is 85 ℃ ± 8 ℃ by the temperature after lowering the temperature.
Relieving haperacidity method for recovering low-temperature level heat energy in the above-mentioned gas washing in SA production, the temperature after deoxygenation demineralized water wherein is heated is 80 ℃ ± 8 ℃.
Relieving haperacidity method for recovering low-temperature level heat energy in the above-mentioned gas washing in SA production, wherein low boiling working fluid is an ammoniacal liquor, or the diformazan mystery.
Explain: 1. present, to go out tower recycle acid temperature low slightly because of tower drier, puts aside the recovery of its recycle acid heat; 2. consider the hidden danger of generation when leaking and the difficulty that material is selected,, put aside direct with low boiling working fluid and sulfuric acid indirect heat exchange in view of present equipment level; 3. the screw expansion motor group can be purchased from market, only needs to carry out pipe arrangement according to the technology path and the technological process of design.
Use heat-energy recovering apparatus of the present invention, should operate by following main points:
1) replenishes the deoxygenation demineralized water until filling demineralized water heater and pipeline
2) start demineralized water pipeline pump and build normal circulation, wait for the sulfuric acid apparatus driving that feeds intake.
3) after demineralized water heater import concentrated sulphuric scid temperature rises to 80 ℃, start working medium pump and begin the working medium periodic duty after sulfuric acid apparatus is driven, system changes normal operation over to afterwards.
The inventive method has advantage, and relieving haperacidity workshop section low-temperature heat energy in (1) effective reclaim sulfuric acid production process is saved the recirculated cooling water power consumption simultaneously and reduced the circulating cooling make-up water amount, and energy-saving significance is great;
(2) original sulfuric acid apparatus reducing energy consumption is convenient in the present invention very much, almost original device is not done big change, only increases equipment component, does not influence mainly controling of original device;
(3) the screw expansion generator set reliability of being selected for use is high.
It is the gas washing in SA production enterprise of raw material that the present invention is applicable to sulphur or pyrite, both can be used for the construction of new equipment, also can be used for the technical innovation of old device.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Among the figure, 1. demineralized water heater, 2. deoxygenation demineralized water, 3. cycle fluid (low boiling working fluids such as ammoniacal liquor or diformazan mystery), 4. screw expansion motor group, 5. working medium condenser, 6. pipeline mounted pump, the 7. concentrated sulphuric scid, 8. working medium heater, 9. generator.
Embodiment
The a complete set of dual-circulation screw expansion motor group of sulfuric acid plant of urn good fortune (group) company device comprises that a demineralized water heater 1, a cover screw expansion motor group 4 and associated electrical appearance control system, working medium condenser 5, a pipeline mounted pump 6 form heat-energy recovering apparatus.The temperature that will go out tower from relieving haperacidity operation absorption tower is that 104 ℃ recycle acid is introduced demineralized water heater 1, through heat exchange, and the system of getting back to after recycle acid the is cooled to 85 ℃ absorption that circulates, institute's liberated heat is taken out of by the deoxygenation demineralized water; Get into screw expansion generator set 4 after the deoxygenation demineralized water is heated to 80 ℃, through pipe circle pump 6 circulations, realize cycle heat exchange after the heat release; Low boiling working fluid and demineralized water indirect heat exchange; Evaporate after low boiling working fluid is heated, boost, then through screw expansion motor group 4, drive generator 9 and realize generating, working medium continues circulation, thereby effectively reclaims the low-temperature heat energy of recycle acid.The correlation technique parameter is following:
Screw rod machine inlet pressure: 1.36MPa (cutting off);
Screw rod machine inlet temperature: 57 ℃;
Screw rod machine inlet flow rate: 840t/h;
Mass dryness fraction: 0.089;
Screw rod machine outlet pressure: 0.83MPa (cutting off);
Screw rod machine outlet temperature: 37 ℃;
Installation generated output: 700kW;
Specified generated output: 650kW;
Clean generated output: 310kW (because of from power consumption: working medium pump power 270kW, recirculated cooling water pump power 70kW).
The economic benefit that is obtained is following:
Installation generated output (kW) 700kW;
Clean generated output (kW) 310kW;
Annual electricity generating capacity (8000h/a) 2,480,000 degree;
(0.50 yuan/kW.h) 1,240,000 yuan of year power benefits;
Reduce circulating water pump power (kW) 384 to spend/hour;
Year amount of electricity saving (8000h/a) 3,070,000 degree;
(0.50 yuan/kW.h) 153.5 ten thousand yuan of year economize on electricity benefits;
277.5 ten thousand yuan of year total revenues.
Claims (5)
1. relieving haperacidity method for recovering low-temperature level heat energy in the gas washing in SA production is characterized in that by screw expansion motor group (4), and pipeline mounted pump of circulation usefulness (6) and demineralized water heater (1) connect to form heat-energy recovering apparatus through pipeline; Wherein demineralized water heater (1) connects into a loop through the pipeline mounted pump (6) of working medium heater (8) in the pipeline connecting screw rod expansion motive power machine group and circulation usefulness; The demineralized water heater is introduced in the high temperature circulation acid that will go out tower from relieving haperacidity operation absorption tower; Through heat exchange, the recycle acid concentrated sulphuric scid (7) is through between the pipe of demineralized water heater (1), and deoxygenation demineralized water (2) is walked in the pipe; The concentrated sulphuric scid (7) is by the system of getting back to after the being lowered the temperature absorption that circulates again, and institute's liberated heat is taken out of by the deoxygenation demineralized water; The deoxygenation demineralized water is heated the cycle fluid heater (8) that the back gets into screw expansion motor group (4), through the pipeline mounted pump circulation, realizes cycle heat exchange after the heat release; Low boiling working fluid and demineralized water adopt indirect heat exchange; Or directly use low boiling working fluid and sulfuric acid indirect heat exchange; Evaporate after low boiling working fluid is heated, boost, realize generating through the screw expansion motor group then, or directly drag other motive force equipment; Working medium continues circulation, thereby reach the relieving haperacidity low-temperature heat energy is effectively reclaimed.
2. relieving haperacidity method for recovering low-temperature level heat energy in the gas washing in SA production according to claim 1 is characterized in that wherein the screw expansion motor group comprises working medium heater, working medium condenser, screw expansion motor, generator (9) and electric appearance control system.
3. relieving haperacidity method for recovering low-temperature level heat energy in the gas washing in SA production according to claim 1 is characterized in that the temperature of the high temperature circulation acid concentrated sulphuric scid (7) wherein is 104 ℃ ± 8 ℃, and recycle acid is 85 ℃ ± 8 ℃ by the temperature after lowering the temperature.
4. relieving haperacidity method for recovering low-temperature level heat energy in the gas washing in SA production according to claim 1, the temperature after deoxygenation demineralized water wherein is heated is 80 ℃ ± 8 ℃.
5. relieving haperacidity method for recovering low-temperature level heat energy in the gas washing in SA production according to claim 1 is characterized in that wherein low boiling working fluid is an ammoniacal liquor, or the diformazan mystery.
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| CN2009101029970A CN101781998B (en) | 2009-12-30 | 2009-12-30 | Method for recovering low-temperature level heat energy in acid making in sulfuric acid production |
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| CN2009101029970A CN101781998B (en) | 2009-12-30 | 2009-12-30 | Method for recovering low-temperature level heat energy in acid making in sulfuric acid production |
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| CN101781998A CN101781998A (en) | 2010-07-21 |
| CN101781998B true CN101781998B (en) | 2012-04-18 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102556982B (en) * | 2011-12-30 | 2015-04-22 | 凯密迪公司 | Low-temperature exhaust heat system for sulfuric acid recovering device and application of low-temperature exhaust heat system |
| CN105135702B (en) * | 2015-09-18 | 2018-03-16 | 中石化南京工程有限公司 | Oxidation solution heat reclaim unit and recovery method |
| CN105731392B (en) * | 2016-01-29 | 2018-06-26 | 韶关市广宝化工有限公司 | A kind of cooling water recirculation system of gas washing in SA production |
| CN106477530B (en) * | 2016-09-30 | 2018-07-03 | 扬州大学 | A kind of concentrated sulfuric acid preparation facilities based on low temperature exhaust heat Organic Rankine Cycle recovery type |
| CN108252743B (en) * | 2018-01-22 | 2023-10-27 | 中国石油大学(华东) | Full-flow circulating power generation device for geothermal energy |
| CN112696963A (en) * | 2020-12-07 | 2021-04-23 | 中国恩菲工程技术有限公司 | Low-temperature waste heat recovery system of smelting flue gas acid making system |
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| CN101532402A (en) * | 2009-04-22 | 2009-09-16 | 天津大学 | Dual-circulation screw expansion motor system |
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| CN2844824Y (en) * | 2005-05-18 | 2006-12-06 | 天津大学 | Fluid power generating system by low temperature waste heat |
| CN101586513A (en) * | 2009-01-05 | 2009-11-25 | 中国华电工程(集团)有限公司 | Method and device for recycling waste heat in discharged smoke of marsh gas power generation |
| CN101532402A (en) * | 2009-04-22 | 2009-09-16 | 天津大学 | Dual-circulation screw expansion motor system |
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Inventor after: Yang Sanke Inventor after: Cen Zuwang Inventor after: Yang Yi Inventor after: Qiu Zujun Inventor after: Fu Yong Inventor after: Liu Lifeng Inventor before: Cen Zuwang Inventor before: Yang Yi Inventor before: Qiu Zujun Inventor before: Fu Yong Inventor before: Liu Lifeng |
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Free format text: CORRECT: INVENTOR; FROM: CEN ZUWANG YANG YI QIU ZUJUN FU YONG LIU LIFENG TO: YANG SANKE CEN ZUWANG YANG YI QIU ZUJUN FU YONG LIU LIFENG |
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Address after: 550500 Guizhou Province, Qiannan Buyei and Miao Autonomous Prefecture Fuquan Racecourse town Yingbin Road No. 1 Wengfu group Patentee after: WENGFU GROUP Co.,Ltd. Address before: 550002, International Building, No. 57, South City Road, Nanming District, Guizhou, Guiyang Patentee before: WENGFU GROUP Co.,Ltd. |