CN211487179U - System for be used for flue gas desulfurization and preparation gypsum whisker - Google Patents
System for be used for flue gas desulfurization and preparation gypsum whisker Download PDFInfo
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- CN211487179U CN211487179U CN201921795238.2U CN201921795238U CN211487179U CN 211487179 U CN211487179 U CN 211487179U CN 201921795238 U CN201921795238 U CN 201921795238U CN 211487179 U CN211487179 U CN 211487179U
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Abstract
The utility model discloses a system for flue gas desulfurization and preparation gypsum whisker to the use of regenerated regeneration liquid of catalyst washing among the extension catalysis method flue gas desulfurization technique. The system comprises: the catalytic flue gas desulfurization unit is used for catalytically converting sulfur dioxide in the flue gas passing through the catalyst in the flue gas desulfurization unit into sulfuric acid so as to realize flue gas desulfurization; the catalyst washing and regenerating unit is used for washing the catalyst by using a regeneration liquid adopting a sulfuric acid solution or ammonia water to realize catalyst regeneration, and the sulfuric acid solution or the ammonia water is correspondingly changed into a first sulfuric acid solution or a first ammonium sulfate solution after washing and regeneration; the regeneration liquid purification treatment unit is used for purifying a first ammonium sulfate solution or purifying a second ammonium sulfate solution obtained by reacting ammonia water with the first sulfuric acid solution; and the gypsum whisker preparing unit is used for preparing a gypsum whisker product by using the purified first ammonium sulfate solution or second ammonium sulfate solution.
Description
Technical Field
The utility model relates to a system for be used for flue gas desulfurization and preparation gypsum whisker.
Background
As a desulfurization technology with a great application prospect, the catalytic flue gas desulfurization technology generally has the following basic principle: sulfur dioxide, water and oxygen in the flue gas are adsorbed on the catalyst and react under the catalytic action of the active components to generate sulfuric acid; when the sulfuric acid attached to the catalyst reaches a certain degree, the dilute sulfuric acid and water are respectively used as regeneration liquid to circularly spray the catalyst so as to remove the attached sulfuric acid on the catalyst and release the active sites of the catalyst (the circular spraying process is called as catalyst washing regeneration); the used regeneration liquid is reused as a sulfuric acid byproduct. Conventionally, the sulfuric acid by-product is generally sent to an ammonium sulfate plant and used as a raw material for producing ammonium sulfate, and no other use of the sulfuric acid by-product has been disclosed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the regeneration liquid of catalyst washing regeneration in the extension catalysis method flue gas desulfurization technique is used, thereby providing a system for flue gas desulfurization and preparation gypsum whisker.
The utility model discloses a system for be used for flue gas desulfurization and preparation gypsum whisker, include: the catalytic flue gas desulfurization unit is used for catalytically converting sulfur dioxide in the flue gas passing through the catalyst in the flue gas desulfurization unit into sulfuric acid so as to realize flue gas desulfurization; the catalyst washing and regenerating unit is used for washing the catalyst by using a regeneration liquid adopting a sulfuric acid solution or ammonia water to realize catalyst regeneration, and the sulfuric acid solution or the ammonia water is correspondingly changed into a first sulfuric acid solution or a first ammonium sulfate solution after washing and regeneration; the regeneration liquid purification treatment unit is used for purifying a first ammonium sulfate solution or purifying a second ammonium sulfate solution obtained by reacting ammonia water with the first sulfuric acid solution; and the gypsum whisker preparing unit is used for preparing a gypsum whisker product by reacting the purified first ammonium sulfate solution or second ammonium sulfate solution with calcium chloride.
As a further optimization or refinement to the above technical solution, the catalytic flue gas desulfurization unit includes a desulfurization tower, a flue gas inlet is provided at the lower part of the desulfurization tower, a flue gas outlet is provided at the upper part of the desulfurization tower, and the catalyst is provided between the flue gas inlet and the flue gas outlet in the inner cavity of the desulfurization tower.
As a further optimization or refinement to the above technical solution, the catalyst washing regeneration unit includes a circulating spray device assembled with a desulfurization tower into a regeneration liquid circulation system for causing a regeneration liquid to act on the catalyst in a circulating spray manner, the circulating spray device includes a first regeneration liquid supply and recovery unit, a second regeneration liquid supply and recovery unit, and a third regeneration liquid supply and recovery unit that are selectively switchable to and from the regeneration liquid circulation system, the first regeneration liquid supply and recovery unit and the second regeneration liquid supply and recovery unit are respectively used for supplying sulfuric acid solutions having different initial sulfuric acid concentrations as the regeneration liquid, and the third regeneration liquid supply and recovery unit is used for supplying a sulfuric acid solution or water having the lowest initial sulfuric acid concentration as the regeneration liquid, or the first regeneration liquid supply and recovery unit and the second regeneration liquid supply and recovery unit are respectively used for supplying sulfuric acid solutions or water having different initial ammonia concentrations as the regeneration liquid Aqueous ammonia of concentration is used as the regeneration liquid and the third regeneration liquid supply and recovery unit is used to provide aqueous ammonia or water having the lowest initial ammonia concentration as the regeneration liquid.
As a further optimization or refinement to the above technical solution, the regenerated liquid purification processing unit includes a first membrane filtration concentration system for performing solid-liquid separation and concentration on the first ammonium sulfate solution.
As a further optimization or refinement to the above technical solution, the regeneration liquid purification treatment unit includes: the mixing reactor is used for mixing and reacting the received first sulfuric acid solution with ammonia water to obtain a mixed solution containing a second ammonium sulfate solution and a metal hydroxide precipitate and outputting the mixed solution; and the solid-liquid separator is used for receiving the mixed liquid, performing solid-liquid separation treatment on the mixed liquid and respectively discharging a second ammonium sulfate solution and impurities containing metal hydroxide.
As a further optimization or refinement of the technical scheme, the solid-liquid separator adopts a second membrane filtration concentration system which can concentrate the second ammonium sulfate solution.
The system for flue gas desulfurization and gypsum whisker preparation can react the regenerated liquid used in the catalytic flue gas desulfurization technology as a raw material for preparing the gypsum whisker with calcium chloride to prepare a gypsum whisker product, thereby expanding the application of the byproducts related to the catalytic flue gas desulfurization and improving the economic benefit of the operation of the catalytic flue gas desulfurization technology.
The present invention will be further described with reference to the accompanying drawings and the detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part of the disclosure, are included to assist in understanding the disclosure, and the description provided herein and the accompanying drawings, which are related thereto, are intended to explain the disclosure, but do not constitute an undue limitation on the disclosure.
In the drawings:
fig. 1 is a schematic structural diagram of a part of an embodiment of the system for flue gas desulfurization and gypsum whisker preparation.
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these teachings. Before the present invention is described with reference to the accompanying drawings, it is to be noted that:
in the present invention, the technical solutions and the technical features provided in each part including the following description can be combined with each other without conflict.
Furthermore, the embodiments of the present invention mentioned in the following description are generally only a partial embodiment of the present invention, and not all embodiments, therefore, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention based on the embodiments of the present invention.
With respect to the terms and units of the present invention: the term "comprises" and any variations thereof in the description and claims of this invention and the related art are intended to cover non-exclusive inclusions. In addition, other related terms and units in the present invention can be reasonably explained based on the related content of the present invention.
Fig. 1 is a schematic structural diagram of a part of an embodiment of the system for flue gas desulfurization and gypsum whisker preparation. As shown in fig. 1, the system for flue gas desulfurization and preparation of gypsum whiskers comprises: a catalytic flue gas desulfurization unit 100 for catalytically converting sulfur dioxide in the flue gas passing through the catalyst 120 in the flue gas desulfurization unit into sulfuric acid to realize flue gas desulfurization; a catalyst washing and regenerating unit 200, configured to wash the catalyst 120 with a regeneration liquid that uses ammonia water to realize catalyst regeneration, where the ammonia water becomes a first ammonium sulfate solution 201 after washing and regeneration; a regeneration liquid purification processing unit 300, configured to perform purification processing on the first ammonium sulfate solution 201; the gypsum whisker making unit 400 is used for preparing a gypsum whisker product by reacting the purified first ammonium sulfate solution 201 with calcium chloride.
As shown in fig. 1, the catalytic flue gas desulfurization unit 100 includes a desulfurization tower 110, a flue gas inlet is disposed at a lower portion of the desulfurization tower 110, a flue gas outlet is disposed at an upper portion of the desulfurization tower 110, and the catalyst 120 is disposed in an inner cavity of the desulfurization tower 110 between the flue gas inlet and the flue gas outlet.
As shown in fig. 1, the catalyst washing regeneration unit 200 includes a circulating spray device 210 assembled with the desulfurization tower 110 into a regeneration liquid circulation system for causing a regeneration liquid to act on the catalyst 120 in a circulating spray manner, wherein the circulating spray device 210 includes a first regeneration liquid supply and recovery unit 211, a second regeneration liquid supply and recovery unit 212, and a third regeneration liquid supply and recovery unit 213 that are selectively switchable to and from the regeneration liquid circulation system, the first regeneration liquid supply and recovery unit 211 and the second regeneration liquid supply and recovery unit 212 are respectively used to provide ammonia water having different initial ammonia concentrations as the regeneration liquid, and the third regeneration liquid supply and recovery unit 213 is used to provide ammonia water or water having the lowest initial ammonia concentration as the regeneration liquid.
The above-mentioned catalyst washing regeneration unit 200 is used to implement a staged washing regeneration mode. The grading washing regeneration mode specifically comprises the following steps: a first washing regeneration stage of washing the catalyst 120 with a first regeneration liquid of a first regeneration liquid supply and recovery unit 211 using ammonia water having a first initial ammonia concentration as a regenerant; a second washing regeneration stage of washing the catalyst 120 with a second regeneration liquid of a second regeneration liquid supply and recovery unit 212 using aqueous ammonia having a second initial ammonia concentration as a regenerant; and a third washing regeneration stage of washing the catalyst 120 with a third regeneration liquid of a third regeneration liquid supply and recovery unit 213 using ammonia water or water having the lowest initial ammonia concentration as a regenerant; wherein the first initial ammonia concentration > the second initial ammonia concentration. The mass fraction of the first initial ammonia concentration is preferably 5 to 10%, and the mass fraction of the second initial ammonia concentration is preferably 1 to 5%, more preferably 3 to 5%.
The ammonium sulfate solution with three-level concentration gradient can be obtained through the first washing regeneration stage, the second washing regeneration stage and the third washing regeneration stage, that is, the concentration of the ammonium sulfate solution obtained after the first washing regeneration stage is completed is greater than that of the ammonium sulfate solution obtained after the second washing regeneration stage is completed is greater than that of the ammonium sulfate solution obtained after the third washing regeneration stage is completed, so that the ammonium sulfate product obtained after the first washing regeneration stage is completed can be used as the first ammonium sulfate solution 201 to be supplied to the subsequent regeneration liquid purification treatment unit 300, and the regeneration liquid left in the second washing regeneration stage and the regeneration liquid left in the third washing regeneration stage are respectively used as the regeneration liquid of the washing regeneration stage with the specific ammonia concentration requirement in the next regeneration, thereby achieving the purpose of relatively and continuously supplying the ammonium sulfate solution with the specific concentration to the subsequent use party.
In practical implementation, the catalyst washing regeneration unit 200 realizes the transfer of the regeneration liquid through the pump 220 and the pipes connected between the first regeneration liquid supply and recovery unit 211, the second regeneration liquid supply and recovery unit 212, and the third regeneration liquid supply and recovery unit 213 described above and the desulfurization tower 110, respectively. In addition, the desulfurizing tower 110 is provided with a liquid outlet at the bottom, a desulfurized flue gas outlet at the top, and a spraying facility (not shown) at the top of the desulfurizing tower 110. Below the desulfurization tower 110 are a first regenerated liquid supply and recovery unit 211, a second regenerated liquid supply and recovery unit 212, and a third regenerated liquid supply and recovery unit 213, which are arranged in parallel with the first regenerated liquid supply and recovery unit 211, the second regenerated liquid supply and recovery unit 212, and the third regenerated liquid supply and recovery unit 213 and are connected to the liquid discharge port of the desulfurization tower 110 through valves, respectively. The liquid discharge ports of the first regenerated liquid supply and recovery unit 211, the second regenerated liquid supply and recovery unit 212, and the third regenerated liquid supply and recovery unit 213 are respectively connected to a pump 220 through valves, and the pump 220 is connected to a spray facility at the top of the desulfurization tower 110 through a pipe.
As shown in fig. 1, the regeneration liquid purification treatment unit 300 includes a first membrane filtration concentration system for performing solid-liquid separation and concentration on the first ammonium sulfate solution 201. The first membrane filtration concentration system may include a first reservoir 310 for storing the first ammonium sulfate solution 201 to be filtered and a first membrane filtration concentrator 320 connected to the first reservoir 310. In this way, the first ammonium sulfate solution 201 output from the catalyst washing and regenerating unit 200 enters the first storage 310, and then the first ammonium sulfate solution 201 in the first storage 310 is sent to the first membrane filtration concentrator 320, the ammonium sulfate solution in the first ammonium sulfate solution 201 passes through the filtration membrane of the first membrane filtration concentrator 320 to become the purified first ammonium sulfate solution 201, and the concentrated solution in the first membrane filtration concentrator 320 returns to the first storage 310, and the above-mentioned circulation is performed.
The gypsum whisker making unit 400 includes a reactor that receives the purified first ammonium sulfate solution 201 and calcium chloride for reaction to produce a gypsum whisker product. The process of preparing gypsum whisker by using ammonium sulfate and calcium chloride as raw materials is conventional, and for example, a similar method is disclosed in chinese patent publication No. CN102794100B, and thus is not described herein again.
The utility model discloses another a system for flue gas desulfurization and preparation gypsum whisker includes: a catalytic flue gas desulfurization unit 100 for catalytically converting sulfur dioxide in the flue gas passing through the catalyst 120 in the flue gas desulfurization unit into sulfuric acid to realize flue gas desulfurization; a catalyst washing and regenerating unit 200 for washing the catalyst 120 with a regeneration solution using a sulfuric acid solution to realize catalyst regeneration, wherein the sulfuric acid solution becomes a first sulfuric acid solution after washing and regeneration; a regenerated liquid purification unit 300, configured to react ammonia with the first sulfuric acid solution to obtain a second ammonium sulfate solution, and then purify the second ammonium sulfate solution; the gypsum whisker making unit 400 is used to prepare a gypsum whisker product by reacting the purified second ammonium sulfate solution with calcium chloride.
The structures of the catalytic flue gas desulfurization unit 100 and the catalyst washing and regenerating unit 200 are the same as those of the catalytic flue gas desulfurization unit 100 and the catalyst washing and regenerating unit 200, and the difference is only the replacement of the regeneration liquid. And; the regenerated liquid purification processing unit 300 includes a mixing reactor, and is configured to mix and react the received first sulfuric acid solution with ammonia water to obtain a mixed solution containing a second ammonium sulfate solution and a metal hydroxide precipitate, and output the mixed solution; and the solid-liquid separator is used for receiving the mixed liquid, performing solid-liquid separation treatment on the mixed liquid and respectively discharging a second ammonium sulfate solution and impurities containing metal hydroxide. The solid-liquid separator preferably adopts a second membrane filtration concentration system which can concentrate the second ammonium sulfate solution, and the structure of the second membrane filtration concentration system can be consistent with that of the first membrane filtration concentration system.
The contents of the present invention have been explained above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the above disclosure of the present invention, all other preferred embodiments and examples obtained by a person skilled in the art without any creative effort shall fall within the protection scope of the present invention.
Claims (6)
1. A system for flue gas desulfurization and preparation of gypsum whiskers, comprising:
the catalytic flue gas desulfurization unit is used for catalytically converting sulfur dioxide in the flue gas passing through the catalyst in the flue gas desulfurization unit into sulfuric acid so as to realize flue gas desulfurization;
the catalyst washing and regenerating unit is used for washing the catalyst by using a regeneration liquid adopting a sulfuric acid solution or ammonia water to realize catalyst regeneration, and the sulfuric acid solution or the ammonia water is correspondingly changed into a first sulfuric acid solution or a first ammonium sulfate solution after washing and regeneration;
the regeneration liquid purification treatment unit is used for purifying a first ammonium sulfate solution or purifying a second ammonium sulfate solution obtained by reacting ammonia water with the first sulfuric acid solution;
and the gypsum whisker preparing unit is used for preparing a gypsum whisker product by reacting the purified first ammonium sulfate solution or second ammonium sulfate solution with calcium chloride.
2. The system for flue gas desulfurization and preparation of gypsum whiskers of claim 1, wherein: the catalytic flue gas desulfurization unit comprises a desulfurization tower, a flue gas inlet is formed in the lower portion of the desulfurization tower, a flue gas outlet is formed in the upper portion of the desulfurization tower, and the catalyst is arranged in the inner cavity of the desulfurization tower and located between the flue gas inlet and the flue gas outlet.
3. The system for flue gas desulfurization and preparation of gypsum whiskers of claim 2, wherein:
the catalyst washing and regenerating unit comprises a circulating spray device which is assembled with the desulfurizing tower into a regenerated liquid circulating system for leading the regenerated liquid to act on the catalyst in a circulating spray mode,
the circulating spraying device comprises a first regenerated liquid supply and recovery unit, a second regenerated liquid supply and recovery unit and a third regenerated liquid supply and recovery unit which can be selectively switched in and out of the regenerated liquid circulating system,
the first and second regeneration liquid supply and recovery units are respectively for supplying sulfuric acid solutions having different initial sulfuric acid concentrations as regeneration liquids and the third regeneration liquid supply and recovery unit is for supplying a sulfuric acid solution or water having the lowest initial sulfuric acid concentration as a regeneration liquid, or the first and second regeneration liquid supply and recovery units are respectively for supplying aqueous ammonia having different initial ammonia concentrations as a regeneration liquid and the third regeneration liquid supply and recovery unit is for supplying aqueous ammonia or water having the lowest initial ammonia concentration as a regeneration liquid.
4. The system for flue gas desulfurization and preparation of gypsum whiskers as recited in claim 1, 2 or 3, wherein: the regenerated liquid purification treatment unit comprises a first membrane filtration concentration system for performing solid-liquid separation and concentration on a first ammonium sulfate solution.
5. The system for flue gas desulfurization and preparation of gypsum whiskers of claim 1, 2, or 3, wherein the regeneration liquid purification treatment unit comprises: the mixing reactor is used for mixing and reacting the received first sulfuric acid solution with ammonia water to obtain a mixed solution containing a second ammonium sulfate solution and a metal hydroxide precipitate and outputting the mixed solution; and the solid-liquid separator is used for receiving the mixed liquid, performing solid-liquid separation treatment on the mixed liquid and respectively discharging a second ammonium sulfate solution and impurities containing metal hydroxide.
6. The system for flue gas desulfurization and preparation of gypsum whiskers of claim 5, wherein: the solid-liquid separator adopts a second membrane filtration concentration system which can concentrate the second ammonium sulfate solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921795238.2U CN211487179U (en) | 2019-10-24 | 2019-10-24 | System for be used for flue gas desulfurization and preparation gypsum whisker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921795238.2U CN211487179U (en) | 2019-10-24 | 2019-10-24 | System for be used for flue gas desulfurization and preparation gypsum whisker |
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