CN101734687B - Process for purifying and treating vacuum salt preparation brine and boiler waste gas and device thereof - Google Patents
Process for purifying and treating vacuum salt preparation brine and boiler waste gas and device thereof Download PDFInfo
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- CN101734687B CN101734687B CN200910311990XA CN200910311990A CN101734687B CN 101734687 B CN101734687 B CN 101734687B CN 200910311990X A CN200910311990X A CN 200910311990XA CN 200910311990 A CN200910311990 A CN 200910311990A CN 101734687 B CN101734687 B CN 101734687B
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- bittern
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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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Abstract
The invention discloses a process for purifying and treating vacuum salt preparation brine and boiler waste gas and a device thereof. The process comprises the steps of primary reaction, secondary reaction, fine halogen preparation, salt preparation and the like, wherein before entering a brine secondary reactor to participate in the reaction, the boiler waste gas is subjected to gas washing, compression and vapor-water separation treatment in turn, the primary brine is used as the washing water for washing the gas, and the fine halogen is used as working solution and sealing water of a compressor; after the gas washing water, the working solution and the sealing water of the compressor are separated, the water is returned to a brine primary reactor to participate in the primary reaction; and the mother solution after preparing the salt is returned to the brine primary reactor to participate in the primary reaction. The process for purifying the brine and treating the boiler waste gas at the same time reduces the brine purifying cost, saves the water, reduces the energy consumption, has no waste water discharge, and reduces waste gas emission so as to lighten the environment pollution.
Description
Technical field
The invention belongs to vacuum salt preparation brine, reach boiler waste gas (being flue gas) the purification techniques field that power station fire coal/gas fired-boiler produces, particularly a kind of vacuum salt preparation brine and boiler waste gas purification treatment process and device thereof.
Background technology
Contain Ca in the vacuum salt production industry calcium sulfate type bittern
2+, Mg
2+, SO
4 2-Etc. plurality of impurity ions, and Ca
2+, Mg
2+Content is far above sodium sulphate type bittern, as if directly enter vapo(u)rization system, the Ca that bittern is brought into without purification
2+, Mg
2+Enrichment Deng all cpds that forms will cause equipment scaling, reduce heat transfer efficiency, increase energy consumption; Also bigger to the quality product influence simultaneously.Therefore should purify bittern earlier before the evaporation, help prolonging the cycle of operation of vacuum salt making facility, reduce running cost, improve the effective rate of utilization of device, stably manufactured, reduction consume, reduce labor strength, improve the quality of products and production capacity.
The bittern purifying mode has a variety of, and wherein that commonly used is two alkaline process, lime-soda method and lime-saltcake-CO
2Method etc.Present domestic salt making enterprises adopts two alkaline process or lime-soda method purified brine mostly, but because caustic soda and soda ash price that these two kinds of methods are added are higher, and the calcium that contains in the bittern, magnesium ion content height need the amount of caustic soda and soda ash bigger, cause purifying the cost height.
On the other hand, the waste gas that power station fire coal, gas fired-boiler produce in the vacuum salt production industry (is boiler waste gas/flue gas, mainly contains CO
2, SO
2, dust etc.) all be not fully used usually, but directly discharge by the simple back of handling, unavoidably environment is polluted.
Also have in the prior art at present and utilize boiler waste gas to handle the technology and the device of purified brine simultaneously, its technical process and device synoptic diagram generally include demagging, deliming reaction, make key steps such as smart halogen, salt manufacturing as shown in Figure 2, wherein:
Removing reactive magnesium is to add lime (in the demagging reaction container) to carry out in former halogen; Because of containing a certain amount of sodium sulfate in the former halogen, add lime and the reaction of sodium sulfate wherein generation sodium hydroxide, reactive magnesium generates magnesium hydrate precipitate in lime and the bittern simultaneously.
The deliming reaction is the reacted clear liquid of demagging to be introduced in the bittern deliming reaction container carry out, and introduces therein simultaneously through the boiler waste gas after handling in advance and participates in reaction; Generate lime carbonate with the calcium reaction in the clear liquid.
Boiler waste gas need pass through scrubber tower gas washing, compressor compresses, air water separator separating treatment successively entering before the deliming reaction container participates in reaction, separates the back boiler waste gas as one of raw material of second order reaction.Wherein: when boiler waste gas carries out the gas washing processing in scrubber tower, to add tap water as wash water; When boiler waste gas carries out processed compressed in compressor, to add tap water as working fluid and sealing water; The gas washing water that from scrubber tower, comes out, the working fluid that from compressor, comes out and sealing water and from air water separator come out separate after water, all as discharge of wastewater; Or return bittern purifying, enter the salt manufacturing vapo(u)rization system again.
Make smart halogen step and be the clear liquid after the second order reaction is squeezed in the smart halogen bucket with pump standby, as the salt manufacturing raw material.
The salt manufacturing step is delivered into salt making system with smart halogen, carries out multiple-effect evaporation, produces product salt behind the evaporative crystallization, and the mother liquor after the salt manufacturing mainly contains sodium sulfate, is used to carry nitre.
According to this technical process, obviously, need to consume great amount of water resources, and wastewater discharge is big, big for environment pollution; If return the bittern purifying system, enter the salt manufacturing vapo(u)rization system owing to bring a large amount of tap water into, the water yield that the halogen in the former halogen contains the evaporation of (being NaCl content) reduction needs is more, causes energy dissipation bigger.
Summary of the invention
Main purpose of the present invention be higher at bittern purifying technology cost in the above-mentioned prior art vacuum salt production industry, consume great lot of water resources, energy consumption height, waste gas wastewater discharge and cause problems such as environmental pollution greatly, a kind of vacuum salt preparation brine and boiler waste gas purification treatment process are provided, this technology can be handled boiler waste gas in purified brine, both reached the low-cost purpose that purifies bittern, but thereby also water saving, cut down the consumption of energy, reduce the waste gas discharge of wastewater and alleviate pollution environment.
Another object of the present invention provides a kind of peculiar device that is used for above-mentioned technology.
In order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows:
A kind of vacuum salt preparation brine and boiler waste gas purification treatment process comprise: key steps such as first order reaction, second order reaction, the smart halogen of system, salt manufacturing:
First order reaction is former halogen to be introduced in the bittern A reactor and added causticizing agent (as lime) carry out;
Second order reaction is the clear liquid after the first order reaction to be introduced in the bittern second reactor carry out, and introduces through boiler waste gas after the separation of scrubber tower gas washing, compressor compresses, air water separator separating treatment participating in second order reaction simultaneously in the bittern second reactor;
Making smart halogen step is that the clear liquid after the second order reaction is introduced in the smart halogen bucket, through sedimentation is standby once more, and the raw material of using as salt manufacturing;
The salt manufacturing step is that smart halogen is delivered into salt making system, carries out multiple-effect evaporation, produces product salt behind the evaporative crystallization;
Wherein:
In the first order reaction, enter the bittern A reactor except former halogen and causticizing agent, also comprise from the mother liquor of mother vat and from the gas washing water of scrubber tower, from the working fluid of compressor and sealing water, from water after the separating of air water separator;
In the second order reaction, boiler waste gas carries out gas washing when handling in scrubber tower, with former halogen as wash water; When boiler waste gas carries out processed compressed in compressor, with smart halogen as working fluid and the sealing water; The gas washing water that from scrubber tower, comes out, the working fluid that from compressor, comes out and sealing water and from air water separator come out separate after water, all store, return in the bittern A reactor by pump and participate in first order reaction by retention basin;
The mother liquor that obtains after the salt manufacturing step process is temporary in the mother vat, also turns back in the bittern A reactor and participates in first order reaction.
In the above-mentioned technology, wash water adopts former halogen to substitute the effect of tap water in the scrubber tower:
The one, because former halogen is weakly alkaline, then contain sour gas in the boiler waste gas.Adopt weakly alkaline bittern to substitute tap water and be used as gas water, the impurity component in the eccysis boiler waste gas more effectively, washing effect is better; But the bittern Returning reactor behind the gas washing participates in reaction simultaneously, and can not reduce the halogen content (being NaCl content) in the smart halogen, also can not pollute environment, makes it obtain comprehensive utilization, benign cycle in the formation system;
And the available technology adopting tap water is as gas water, the large usage quantity of water, and washing effect is poor slightly; Gas washing water if do not return direct discharging, can cause bigger pollution to environment if the halogen that Returning reactor will reduce in the former halogen greatly contains (being NaCl content) again simultaneously; In a word after the tap water wash water discharge system, no suitable wastewater treatment scheme;
Therefore, adopt former halogen to substitute tap water, but conserve water resource not only also can improve the gas washing effect, and reduce environmental pollution as wash water.
Working fluid and sealing hydromining substitute the effect of tap water in the compressor with smart halogen:
Compressor operating liquid and the smart halogen of sealing hydromining, the one, owing to removed foreign ion in the smart halogen, equipment itself there is not harm; The 2nd, but the water after recycling also Returning reactor participate in reaction, and can not reduce the halogen content (being NaCl content) in the smart halogen, can not pollute environment yet, make it obtain comprehensive utilization, circulate benignly the formation system in; The 3rd, after discharging, working fluid and sealing water has certain heat, and Returning reactor has also made full use of heat energy to reacting favourable;
And the available technology adopting tap water as compressor operating liquid and the sealing water, the one, the tap water wasting of resources is bigger, the 2nd, heat waste is bigger, waste water effluxes and also can affect greatly environment;
Therefore, adopt smart halogen to substitute tap water, further conserve water resource, minimizing heat energy consumption, minimizing environmental pollution as compressor operating liquid and sealing water.
The device that is used for above-mentioned vacuum salt preparation brine and boiler waste gas purification treatment process, as shown in Figure 1, comprising: former halogen bucket, bittern A reactor, bittern second reactor, smart halogen bucket, salt making system, mother vat, scrubber tower, compressor, air water separator, and connecting tube etc.; Wherein:
Between former halogen bucket, bittern A reactor, bittern second reactor, smart halogen bucket, salt making system, the mother vat, pass through pipe connection successively;
Between scrubber tower, compressor, the air water separator, pass through pipe connection successively;
Scrubber tower also is connected with the boiler waste gas generation device by pipeline;
Air water separator also is connected with the bittern second reactor by pipeline;
In addition:
Mother vat also is connected with the bittern A reactor by pipeline;
Former halogen bucket also is connected with scrubber tower by pipeline;
Smart halogen bucket also is connected with compressor by pipeline;
Water out after the separating of the gas washing water out of scrubber tower, the working fluid of compressor and sealing water out, air water separator also is connected with retention basin by pipeline respectively;
Retention basin also is connected with the bittern A reactor by pipeline and pump.
In addition, because process using boiler waste gas of the present invention is as gas washing, and in the boiler waste gas by containing acidic component, easily devices such as scrubber tower and air water separator and pipeline are caused corrosion, therefore, these devices can adopt exotic materials with corrosion resistance characteristic (as the reinforced glass fiber reinforced plastic material etc.) to make.
Compared with prior art, the invention has the beneficial effects as follows:
Vacuum salt preparation brine of the present invention and boiler waste gas purification treatment process can be realized the comprehensive utilization and the closed circuit systemic circulation of resource, utilize the CO in the vacuum salt production station boiler waste gas
2As the raw material of handling bittern, processes such as the collection of boiler waste gas, purification, compression, conveying are all adopted brand-new technology, can make full use of the boiler waste gas purification bittern in the supporting power station of salt manufacturing; And by waste water is recycled, whole device does not need to add tap water again, but conserve water resource; Also can arrive no waste water simultaneously and efflux and reduce exhaust gas emission, alleviate environmental pollution, and reduce heat energy consumption.Mainly reach described technique effect by the following aspects:
1, the boiler waste gas after dust-removal and desulfurizing is handled earlier through the scrubber tower gas washing, more compressed, after air water separator separates, feed and participate in reaction in the reactor;
In gas scrubbing, boiler waste gas enters from the middle and lower part of tower, and wash water sprays fully contact from the top of tower, to reach good gas washing effect; Wherein wash water adopts former halogen, and recovery enters reactive system behind gas washing, does not efflux, but the conserve water resource improves the gas washing effect, and reduces environmental pollution.
2, enter compressor through the boiler waste gas after the scrubber tower and compress, guarantee the gas delivery effect; Its working fluid and sealing water all adopt smart halogen, and the heat energy consumption of further conserve water resource, and minimizing with the back Returning reacting system, does not cause any environmental pollution.
3, the gas after the compressed machine compression enters air water separator; Separate back gas and enter reactive system from the top discharge, water enters retention basin from the bottom, also returns the bittern reactive system, does not cause environmental pollution, and helps the conserve water resource.
Description of drawings
Fig. 1 shows vacuum salt preparation brine of the present invention and boiler waste gas purification processing technological flow and device synoptic diagram;
Fig. 2 shows prior art vacuum salt preparation brine and boiler waste gas purification processing technological flow and device synoptic diagram.
Embodiment
Below in conjunction with embodiment foregoing invention content of the present invention is described in further detail.
But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.Not breaking away under the above-mentioned technological thought situation of the present invention, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Embodiment 1
Present embodiment is vacuum salt preparation brine and boiler waste gas purification treatment process:
Its process flow diagram comprises as shown in Figure 1: key steps such as first order reaction, second order reaction, the smart halogen of system, salt manufacturing:
First order reaction is that former halogen is introduced in the bittern A reactor, and adds causticizing agent (lime) and mother liquor carries out; Enter the bittern A reactor except former halogen, also comprise from the mother liquor after the salt manufacturing step and from the gas washing water of scrubber tower, from the working fluid of compressor and sealing water, from water after the separating of air water separator;
In first order reaction, add reactive magnesium generation Mg (OH) in a causticizing agent part and the bittern
2Precipitation; Saltcake in another part and the mother liquor carries out causticizing reaction and generates NaOH, enters second order reaction.
Second order reaction is the clear liquid after the first order reaction to be introduced in the bittern second reactor carry out, and introduces through boiler waste gas after the separation of scrubber tower gas washing, compressor compresses, air water separator separating treatment participating in second order reaction simultaneously in the bittern second reactor;
Boiler waste gas carries out gas washing when handling in scrubber tower, with former halogen as wash water; When boiler waste gas carries out processed compressed in compressor, as working fluid and sealing water, be compressed to 0.2MPa with smart halogen; The gas washing water that from scrubber tower, comes out, the working fluid that from compressor, comes out and sealing water and from air water separator come out separate after water, all store, return in the bittern A reactor by pump and participate in first order reaction by retention basin;
In second order reaction, the CO that contains in the boiler waste gas
2The NaOH reaction that generates with first order reaction generates Na
2CO
3, Na
2CO
3Again with bittern in the calcium effect generate insoluble substance C aCO
3Thereby, remove the Ca in the bittern
2+
Making smart halogen step is that the clear liquid after the second order reaction is squeezed in the smart halogen bucket with pump, through sedimentation is standby once more, and the raw material of using as salt manufacturing.
The salt manufacturing step is that smart halogen is delivered into salt making system, carries out multiple-effect evaporation, produces product salt behind the evaporative crystallization, and the mother liquor that obtains after the salt manufacturing step process then returns the bittern purifying operation, enters in the bittern A reactor and participates in first order reaction.
Embodiment 2
Present embodiment is the device that is used for above-mentioned vacuum salt preparation brine and boiler waste gas purification treatment process:
As shown in Figure 1, comprising: former halogen bucket, bittern A reactor, bittern second reactor, smart halogen bucket, salt making system, mother vat, scrubber tower, compressor, air water separator, and connecting tube etc.;
Wherein:
Between former halogen bucket, bittern A reactor, bittern second reactor, smart halogen bucket, salt making system, the mother vat, pass through pipe connection successively;
Between scrubber tower, compressor, the air water separator, pass through pipe connection successively;
Scrubber tower also is connected with the boiler waste gas generation device by pipeline;
Air water separator also is connected with the bittern second reactor by pipeline;
In addition:
Mother vat also is connected with the bittern A reactor by pipeline;
Former halogen bucket also is connected with scrubber tower by pipeline;
Smart halogen bucket also is connected with compressor by pipeline;
Water out after the separating of the gas washing water out of scrubber tower, the working fluid of compressor and sealing water out, air water separator also is connected with retention basin by pipeline respectively;
Retention basin also is connected with the bittern A reactor by pipeline and pump;
Scrubber tower, air water separator and connecting tube all adopt the reinforced glass fiber reinforced plastic material with corrosion resistance characteristic to make.
Claims (2)
1. vacuum salt preparation brine and boiler waste gas purification treatment process, key step comprises first order reaction, second order reaction, the smart halogen of system, salt manufacturing, wherein:
First order reaction is that former halogen is introduced in the bittern A reactor, and the adding causticizing agent carries out;
Second order reaction is the clear liquid after the first order reaction to be introduced in the bittern second reactor carry out, and introduces through boiler waste gas after the separation of scrubber tower gas washing, compressor compresses, air water separator separating treatment participating in second order reaction simultaneously in the bittern second reactor;
Making smart halogen step is that the clear liquid after the second order reaction is introduced in the smart halogen bucket, through sedimentation is standby once more, and the raw material of using as salt manufacturing;
The salt manufacturing step is that smart halogen is delivered into salt making system, carries out multiple-effect evaporation, produces product salt behind the evaporative crystallization, and mother liquor then returns the bittern purifying operation;
It is characterized in that:
In the described first order reaction, enter the bittern A reactor except former halogen, also comprise from the mother liquor of salt-making mother liquor bucket and from the gas washing water of scrubber tower, from the working fluid of compressor and sealing water, from water after the separating of air water separator;
In the described second order reaction, boiler waste gas carries out gas washing when handling in scrubber tower, with former halogen as wash water; When boiler waste gas carries out processed compressed in compressor, with smart halogen as working fluid and the sealing water; The gas washing water that from scrubber tower, comes out, the working fluid that from compressor, comes out and sealing water and from air water separator come out separate after water, all store, return in the bittern A reactor by pump and participate in first order reaction by retention basin;
The mother liquor that obtains after the described salt manufacturing step process is temporary in the mother vat, also turns back in the bittern A reactor and participates in first order reaction.
2. vacuum salt preparation brine and boiler waste gas purification treatment unit comprise: former halogen bucket, bittern A reactor, bittern second reactor, smart halogen bucket, salt making system, mother vat, scrubber tower, compressor, air water separator and connecting tube, wherein:
Between former halogen bucket, bittern A reactor, bittern second reactor, smart halogen bucket, salt making system, the mother vat, pass through pipe connection successively;
Between scrubber tower, compressor, the air water separator, pass through pipe connection successively;
Scrubber tower also is connected with the boiler waste gas generation device by pipeline;
Air water separator also is connected with the bittern second reactor by pipeline;
It is characterized in that:
Mother vat also is connected with the bittern A reactor by pipeline;
Former halogen bucket also is connected with scrubber tower by pipeline;
Smart halogen bucket also is connected with compressor by pipeline;
Water out after the separating of the gas washing water out of scrubber tower, the working fluid of compressor and sealing water out, air water separator also is connected with retention basin by pipeline respectively;
Retention basin also is connected with the bittern A reactor by pipeline and pump;
Described scrubber tower, air water separator and connecting tube adopt the reinforced glass fiber reinforced plastic material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910311990XA CN101734687B (en) | 2009-12-22 | 2009-12-22 | Process for purifying and treating vacuum salt preparation brine and boiler waste gas and device thereof |
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|---|---|---|---|
| CN200910311990XA CN101734687B (en) | 2009-12-22 | 2009-12-22 | Process for purifying and treating vacuum salt preparation brine and boiler waste gas and device thereof |
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|---|---|
| CN101734687A CN101734687A (en) | 2010-06-16 |
| CN101734687B true CN101734687B (en) | 2011-10-26 |
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|---|---|---|---|
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| CN103316577B (en) * | 2013-05-27 | 2015-12-23 | 中国石化江汉油田分公司盐化工总厂 | Salt slurry-purified brine flue gas desulfurization technique |
| CN105056664B (en) * | 2015-08-08 | 2017-03-08 | 广西农垦糖业集团防城精制糖有限公司 | Useless bittern reutilization system |
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