CN1509981A - Heat recovery tower for sulfuric acid plant - Google Patents
Heat recovery tower for sulfuric acid plant Download PDFInfo
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- CN1509981A CN1509981A CNA021541396A CN02154139A CN1509981A CN 1509981 A CN1509981 A CN 1509981A CN A021541396 A CNA021541396 A CN A021541396A CN 02154139 A CN02154139 A CN 02154139A CN 1509981 A CN1509981 A CN 1509981A
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- acid
- tower
- heat recovery
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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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- Gas Separation By Absorption (AREA)
Abstract
A heat recovering tower of sulfuric acid equipment for recovering the heat from concentrated sulfuric acid features that the absorption of sulfuric acid to SO3 is divided into upper and lower stages. The cooled SO3 fume flows upward in tower and the high-temp (120 deg.C) and high-concentration (more than 98%) sulfuric acid flows downward in tower. After the SO3 is absorbed, the sulfuric acid flows through heat exchanger to recover the absorbed heat by other liquid. The flow control and corrosion control are also considered.
Description
Technical field
The present invention relates to the energy recovery technology, particularly a kind of tower that from the vitriol oil, reclaims heat.
Background technology
At the initial stage seventies before proposing the present invention, the sulphur-burning sulphuric acid plant of classics can reclaim about 55% reaction heat as available energy, as is used for technology and heats or generate electricity at turbo-generator.About 40% reaction heat loses in the acid cooler water coolant.Other is as thermal radiation loss, and the heat that discharge and product steam are taken away is remaining 5%.
The rising of energy prices has promoted the innovation of sulfuric acid plant design.In the sulfuric acid plant design in modern times, the economy of the energy has been brought up to adopt turbo-generator as standard characteristic, also provides outlet for extra steam thus.
At the beginning of the eighties, the optimization by design characteristics can make the heat in the process gas be recovered, and the thermo-efficiency of sulfuric acid plant brings up to 70% by 55%.Still have above 25% reaction heat and taken away by the water coolant of acid cooler.
Summary of the invention
The objective of the invention is the heat in the process gas to be reclaimed the biglyyest for gas washing in SA production producer provides a kind of heat recovery tower of pressing steam from the used heat that current acid cooler is lost in the recovery.
Realize concrete technical scheme of the present invention: this heat recovery tower that is used for sulfuric acid apparatus, which comprises at least tower body, the bottom filler, the top filler, acid inlet tube, following acid tube, divide acid tank, mist eliminator and a pump groove are formed, described heat recovery tower, it has the dish-shaped cat head of a band side direction exhanst gas outlet, and the exhanst gas outlet pipeline extends in the tower and be with one to drip the acid ring, at tower middle and lower part filler, be provided with the acid inlet tube of acid trap and connection one on the filler of top separately, following acid tube and branch acid tank, simultaneously be provided with a mist eliminator perpendicular to tower body on tower body internal upper part acid inlet tube, its tower body inner bottom part also is provided with a horizontal recycle pump groove.
The overflow groove that all is provided with longitudinal opening on the tube wall under each root that acid trap on the filler of top of the present invention connects in the acid tube is controlled the flow of acid, acid tube all use the nonmetal mouth of pipe of submerged to insert down in the acid tube under each root that acid trap on the filler of bottom connects, and control acid flow and anticorrosion.
Acid trap of the present invention adopts ferrochrome exothermic, and fe-cr-ni alloy, wipla material are made, and described alloy has ferrite and ausferrite double confounding structure.
Superiority of the present invention, prove through repetition test, from the vitriol oil, reclaim heat, SO3 in reclaiming gas generates the reaction heat that H2SO4 discharged and produces low-pressure steam in reaction, substituted the intermediate absorber in traditional secondary absorption flow process, be applicable to newly-built factory, the transformation of old factory, acid production with sulphur factory, metallurgical off-gas acid-making factory, and can be installed on a commentaries on classics one suction, double conversion double absorption device, it can produce the steam of pressure up to 10 crust very economically, and the thermo-efficiency of whole factory is increased to 95%.Steam can be used to satisfy the caloric requirement in the production process, or generates electricity in turbo-generator.
Description of drawings
Fig. 1, heat recovery tower corollary system schema;
Fig. 2, heat recovery tower one-piece construction synoptic diagram;
Fig. 3, heat recovery tower top acid trap structural representation;
Fig. 4, acid tube overflow groove structural representation under the acid trap of top;
Fig. 5, heat recovery tower bottom acid trap structural representation;
Fig. 6, acid tube immerses nonmetal mouth of pipe cut-away view under the acid trap of bottom.
In each accompanying drawing, heat recovery tower-1, mist eliminator-2, top filler-3, bottom filler-4, horizontal recycle pump groove-5, diluter-6, boiler-7, exhanst gas outlet-8, the air inlet mouth of pipe-9, top acid trap-10, bottom acid trap-11, top acid trap-12, lower section acid tank-13, last subordinate's acid tube-14, following subordinate's acid tube-15, overflow groove-16 immerses the nonmetal mouth of pipe-17.
Fig. 1 is the simplified flow chart of heat recovery tower corollary system.This system is an absorption unit substantially, its service temperature is 200 degree Celsius, use a boiler 7 transfer absorbed thermogenesis water vapour (the highest 10.5 kg/cm) simultaneously, absorb the remaining SO3 of while that is cooled then in the second stage and be absorbed, the flue gas that leaves heat recovery tower is the same with the flue gas that leaves traditional inter-chamber tower substantially.
The sulfuric acid concentration that enters heat recovery tower 1 is near 99%, temperature 165 degree Celsius, absorbed SO3 after, acid temperature and sour dense increase, the concentration when tower is bordering on 99.7%, temperature 200 degree Celsius.The sulfuric acid that leaves boiler 7 is cooled to 157 degree Celsius, and producing pressure simultaneously is the steam of 10 crust.The dilution water that other adds drops to 99% to acid concentration by diluter 6, and this has finished whole process.
Heat recovery tower 1 of the present invention is flat cylindrical tower, forms (see figure 2) by two portions filler 3,4.It has band side direction exhanst gas outlet 8 Saucer Tops.Exhanst gas outlet 8 pipelines must stretch in the tower and be with one to drip the acid ring.Heat recovery tower 1 is by bottom acid trap 11, top 10, and mist eliminator 2 and a pump groove 5 are formed.The effect of its bottom is from import 9 flue gases SO3 to be absorbed in the enough high temperature recycle acid, and so hot sulfuric acid can be used as heating medium and produce the low middle steam of pressing.Its top is to be used for making the flue gas cooling, and the condensation sulfuric acid vapor also absorbs the SO3 that passes through bottom 11.
The effect of mist eliminator 2 is the acid mists that removed deentrainment before flue gas leaves tower, and pump groove 5 is the intercepting basins that are used for doing recycle pump.
Two packing section 3,4 of heat recovery tower all have the acid trap 10,11 that separates separately.As Fig. 3 and Fig. 4, the acid trap 10 on top, absorption tower is to hang down the flow velocity type, and each all has overflow groove 16 to control the flow of acid in the acid tube down.The nonmetal mouth of pipe 17 of acid trap 11 usefulness submerged of bottom inserts acid tube 15 down, better controls acid and flows with anticorrosion.See Fig. 5 and Fig. 6.Do not have to establish an acid trap more in addition for the acid of leaving tower top, it can flow directly to the bottom.
Embodiment
This heat recovery tower is applicable to new factory, old factory, and acid production with sulphur factory and metallurgical off-gas acid-making factory, can be used for one changes a suction or a double conversion double absorption factory.With other equipment, boiler, diluter, after preheater and the well heater combination, it can produce the steam up to 10 crust cheaply, and the thermo-efficiency of whole factory is brought up to 95%.Steam can be used to satisfy technology heating needs or is generated electricity by turbo-generator.
For preventing near the lower acid orifice of the acid trap on tower top, to produce eddy current and corrosion, adopted a kind of acid trap of following acid tube with the fluting overflow type, although as a result of the flow velocity of acid is very low in the acid trap on top, coverage rate is complete simultaneously to still have very high efficient.The nonmetal mouth of pipe of tower bottom acid trap stretches into down the acid tube (see figure 6), as a result of can better control sour flow like this and prevent acid from tower top filler, fall the local corrosion that causes.
When selecting heat recovery tower to comprise the material of acid trap, in the gentle sour dense acid of the acid of match operation scope, carry out static immersion experiment.Following table has been listed some alloys and spent the experimental result of corrosion experiment under acid temperature and the 99% sour dense condition Celsius 200 in the laboratory.
| Material | ??99％@(200℃) |
| Millimeter/year | |
| ????SXR | ??0.440 |
| ????310M | ??0.025 |
| ????G30 | ??0.685 |
| ????29-4C | ??0.192 |
| ????304L | ??0.175 |
| ????ZeCor | ??0.425 |
In a metallurgical off-gas acid-making factory that does not have intermediate absorber, it is before the whole absorption tower that heat recovery tower is installed in.
The gas flow 2914 mark cubic meters per minute that enter from the heat recovery tower bottom, temperature is 166 degree Celsius, 11.8%SO3.The vitriolic acid flux that enters from top of tower is 22670 kg/minute, and concentration is 98.6%, and temperature is 168 degree Celsius.
Concentration was 99.8% when the absorption tower was left in acid, temperature 198 degree Celsius.The total specific absorption of SO3 is near 97% in the flue gas.
Acid is left the absorption tower from flowing into a pump groove, pumps into boiler, and generation pressure is 377kpa, the steam of 830 kg/minute.
Claims (3)
1, a kind of heat recovery tower that is used for sulfuric acid apparatus, which comprises at least tower body, bottom filler, top filler, mist eliminator and a pump groove are formed, it is characterized in that: it has the dish-shaped cat head of a band side direction exhanst gas outlet heat recovery tower, and the exhanst gas outlet pipeline extends in the tower and be with one to drip the acid ring, at tower middle and lower part filler, be provided with the following acid tube of acid inlet tube and connection one on the filler of top separately and divide acid tank, simultaneously be provided with a mist eliminator perpendicular to tower body on tower body internal upper part acid inlet tube, its tower body inner bottom part also is provided with a horizontal recycle pump groove.
2, a kind of heat recovery tower that is used for sulfuric acid apparatus according to claim 1, the overflow groove that it is characterized in that all being provided with on the tube wall in the acid tube under each root that the acid trap on the filler of top connects longitudinal opening is controlled the flow of acid, acid tube under each root that acid trap on the filler of bottom connects all uses the nonmetal mouth of pipe insertion of submerged also to control the mobile and anticorrosion of acid in the acid tube down.
3, a kind of heat recovery tower that is used for sulfuric acid apparatus according to claim 1 and 2 is characterized in that top, and the bottom acid trap adopts ferrochrome exothermic, fe-cr-ni alloy, and the wipla material is made, and has ferrite and ausferrite double confounding structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021541396A CN1509981A (en) | 2002-12-26 | 2002-12-26 | Heat recovery tower for sulfuric acid plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021541396A CN1509981A (en) | 2002-12-26 | 2002-12-26 | Heat recovery tower for sulfuric acid plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1509981A true CN1509981A (en) | 2004-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021541396A Pending CN1509981A (en) | 2002-12-26 | 2002-12-26 | Heat recovery tower for sulfuric acid plant |
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| CN (1) | CN1509981A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109019529A (en) * | 2010-01-20 | 2018-12-18 | 梅克斯公司 | Energy regenerating in sulfuric acid preparation |
-
2002
- 2002-12-26 CN CNA021541396A patent/CN1509981A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109019529A (en) * | 2010-01-20 | 2018-12-18 | 梅克斯公司 | Energy regenerating in sulfuric acid preparation |
| CN109019529B (en) * | 2010-01-20 | 2022-06-14 | 梅克斯公司 | Energy recovery in sulfuric acid production |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |