CN214653680U - System for utilize flue gas dry process desulfurization waste residue coproduction sodium sulfate and sodium chloride - Google Patents
System for utilize flue gas dry process desulfurization waste residue coproduction sodium sulfate and sodium chloride Download PDFInfo
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- CN214653680U CN214653680U CN202120076467.XU CN202120076467U CN214653680U CN 214653680 U CN214653680 U CN 214653680U CN 202120076467 U CN202120076467 U CN 202120076467U CN 214653680 U CN214653680 U CN 214653680U
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Abstract
The utility model discloses a system for co-producing sodium sulfate and sodium chloride by using flue gas dry desulphurization waste residue, which comprises a dissolving tank, a filter, a softener, a first crystallizer, a filtering unit, a multi-effect evaporator and a second crystallizer which are sequentially connected through pipelines; the first crystallizer is also connected with the hot melting tank and the separation unit in sequence through pipelines. Utilize the utility model discloses can purify the desulfurization waste residue into sodium sulfate and sodium chloride, anhydrous sodium sulfate of high purity and sodium chloride possess wide application market, are being widely used in trades such as papermaking, glass, printing and dyeing.
Description
Technical Field
The utility model relates to a desulfurization waste residue treatment facility technical field, concretely relates to utilize system of flue gas dry process desulfurization waste residue coproduction sodium sulfate and sodium chloride.
Background
At present, the main factor for forming haze is the smoke generated in industrial production. Therefore, in order to protect the environment, the flue gas can be discharged into the atmosphere only after being subjected to desulfurization treatment. There are two main types of flue gas desulfurization methods commonly used in the prior art: wet desulfurization and dry desulfurization. Compared with the defects of a wet desulphurization system, such as complexity and easy corrosion of equipment, the dry desulphurization process has simple flow and is generally applied in the industry.
Dry desulfurization is carried out by using a base (e.g., NaOH, NaHCO)3Or Na2CO3Etc.) react with sulfide, HCl, HF and other substances in the flue gas to perform desulfurization, and white powdery waste residue mainly containing sodium sulfate and doped with various impurities is generated. Because the components in the waste residue are complex, the use value is not high, and the waste residue can only be used as a solid waste raw material for low-end building material production.
Therefore, how to properly treat the waste residue generated by the dry flue gas desulfurization to change waste into valuable and generate a product with a high added value becomes a technical problem to be solved urgently in the industry.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an utilize system of flue gas dry process desulfurization waste residue coproduction sodium sulfate and sodium chloride. The system can purify the desulfurization waste residue into sodium sulfate and sodium chloride, and the high-purity anhydrous sodium sulfate and sodium chloride have wide application markets and are widely applied to industries such as papermaking, glass, printing and dyeing and the like.
The utility model provides a following technical scheme:
a system for co-producing sodium sulfate and sodium chloride by using flue gas dry desulfurization waste residues comprises a dissolving tank, a filter, a softener, a first crystallizer, a filtering unit, a multi-effect evaporator and a second crystallizer which are sequentially connected through pipelines; the first crystallizer is also connected with the hot melting tank and the separation unit in sequence through pipelines.
Preferably, the filtering unit comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are connected in sequence, wherein the nanofiltration device is connected with the first crystallizer through a pipeline and is used for conveying the filtered concentrated solution back to the first crystallizer.
Preferably, the reverse osmosis device and the multi-effect evaporator are connected with the dissolving tank through pipelines for conveying water generated in the reaction process into the dissolving tank.
Preferably, the hot-melt tank and the separator are connected to the dissolving tank through a pipeline for transferring the solution generated during the reaction to the dissolving tank.
Preferably, the separation unit comprises a thickener, a centrifugal separator and a drying device which are connected in sequence.
Preferably, heating elements are arranged in the dissolving tank and the hot melting tank.
Compared with the prior art, the utility model has the following advantages:
(1) the utility model discloses energy-concerving and environment-protective, with low costs. Through calculation, the purification cost of one ton of high-purity (more than or equal to 95 percent) anhydrous sodium sulfate is only 30-50 yuan.
(2) The utility model discloses simple process, the operation is stable, and required manual work is few.
(3) The utility model discloses the investment fund is few, and equipment takes up an area of fewly.
(4) The utility model discloses can purify the desulfurization waste residue for anhydrous sodium sulfate and industry sodium chloride, can the wide application in fields such as papermaking, glass, printing and dyeing, application prospect is wide.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, a system for co-producing sodium sulfate and sodium chloride by using flue gas dry desulfurization waste residue comprises a dissolving tank with a heating device, a filter, a softener (cation resin exchanger), a first crystallizer (for example, a DTB or other modified crystallizer), a filtering unit, a multi-effect evaporator and a second crystallizer which are connected in sequence through pipelines; the first crystallizer is also connected with a hot melting tank (a heating device is arranged in the hot melting tank) and a separation unit in sequence through pipelines.
The filtering unit comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device which are sequentially connected, wherein the nanofiltration device is connected with the first crystallizer through a pipeline and is used for conveying the filtered concentrated solution back to the first crystallizer.
The reverse osmosis device and the multi-effect evaporator are connected with the dissolving tank through pipelines and are used for conveying water generated in the reaction process to the dissolving tank.
The hot melting tank and the separator are connected with the dissolving tank through pipelines and are used for conveying the solution generated in the reaction process into the dissolving tank.
The separation unit comprises a thickener, a centrifugal separator and a drying device which are connected in sequence.
The working process of the system for co-producing sodium sulfate and sodium chloride by using the waste residue of the flue gas dry desulphurization is as follows:
(1) dissolving the dry desulfurization waste residue in a dissolving tank, wherein the water temperature is 40-60 ℃, preferably the water temperature is 40-50 ℃, and 400kg of waste residue powder is added into each ton of pure water.
(2) Dilute sulfuric acid or dilute hydrochloric acid is added into the dissolving pool to neutralize the pH value of the solution to about 7.
(3) The impurities insoluble in water are removed by a filter (a precision filter or a bag filter).
(4) And (3) carrying out ion exchange on the solution by using a resin exchanger to remove calcium and magnesium ions in the solution.
(5) And (3) feeding the solution into a first crystallizer, placing for 2 hours at the temperature of 5 ℃, adding 0.1-5% of seed crystal, and separating the generated mirabilite from the solution.
(6) And (2) conveying the generated mirabilite into a hot melting tank, heating to 70-80 ℃, then pumping to a thickener, separating the settled crystal slurry by a centrifugal separator, drying the separated crystal by a drying device to obtain anhydrous sodium sulfate, and packaging into bags. And (4) returning the liquid after the treatment to the dissolving tank in the step (1).
(7) And (5) filtering the solution separated in the step (5) by an ultrafiltration device and a nanofiltration device. The nanofiltration concentrate may be returned to the first crystallizer. The effluent of the nanofiltration device is separated by an RO device, the pure water is sent back to the dissolving tank, and the residual concentrated solution enters a multi-effect evaporator. The condensed water of the multi-effect evaporator is sent back to the dissolving tank, and the crystallized sodium chloride with the purity of more than 85 percent is bagged into industrial salt.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A system for co-producing sodium sulfate and sodium chloride by using flue gas dry desulfurization waste residues is characterized by comprising a dissolving tank, a filter, a softener, a first crystallizer, a filtering unit, a multi-effect evaporator and a second crystallizer which are sequentially connected through pipelines; the first crystallizer is also connected with the hot melting tank and the separation unit in sequence through pipelines.
2. The system of claim 1, wherein the filtration unit comprises an ultrafiltration device, a nanofiltration device and a reverse osmosis device connected in series, wherein the nanofiltration device is connected to the first crystallizer by a pipeline for delivering the filtered concentrate back to the first crystallizer.
3. The system of claim 2, wherein the reverse osmosis unit and the multi-effect evaporator are connected to the dissolving tank through a pipeline for delivering water generated during the reaction to the dissolving tank.
4. The system according to claim 1, wherein the hot-melt tank and the separator are connected to the dissolution tank through a pipeline for transferring the solution generated during the reaction to the dissolution tank.
5. The system of claim 1, wherein the separation unit comprises a thickener, a centrifuge, and a drying device connected in series.
6. The system of claim 1, wherein heating elements are provided in both the dissolving tank and the hot-melt tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120076467.XU CN214653680U (en) | 2021-01-12 | 2021-01-12 | System for utilize flue gas dry process desulfurization waste residue coproduction sodium sulfate and sodium chloride |
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| CN202120076467.XU CN214653680U (en) | 2021-01-12 | 2021-01-12 | System for utilize flue gas dry process desulfurization waste residue coproduction sodium sulfate and sodium chloride |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112607750A (en) * | 2021-01-12 | 2021-04-06 | 导洁(北京)环境科技有限公司 | System and process for co-producing sodium sulfate and sodium chloride by using flue gas dry desulfurization waste residues |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112607750A (en) * | 2021-01-12 | 2021-04-06 | 导洁(北京)环境科技有限公司 | System and process for co-producing sodium sulfate and sodium chloride by using flue gas dry desulfurization waste residues |
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