CN107413178B - Double-tower mutually inverted desulfurization slurry dehydration system - Google Patents
Double-tower mutually inverted desulfurization slurry dehydration system Download PDFInfo
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- CN107413178B CN107413178B CN201710601035.4A CN201710601035A CN107413178B CN 107413178 B CN107413178 B CN 107413178B CN 201710601035 A CN201710601035 A CN 201710601035A CN 107413178 B CN107413178 B CN 107413178B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/73—After-treatment of removed components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a double-tower inverted desulfurization slurry dehydration system, which comprises an absorption tower system, a slurry discharging system and a switching valve loop system, wherein the absorption tower system is connected with a slurry discharging branch arranged in the slurry discharging system through a loop main pipe arranged in the absorption tower system to form a combined branch, and the combined branch is connected with the switching valve loop system. The system has good desulfurization and dehydration effects; most of impurities in the gypsum slurry can be filtered, so that the high-efficiency operation of the system is ensured; when one unit in the system is stopped, gypsum slurry in the double towers can be mutually slurry poured through a reasonably designed connecting valve, so that an accident slurry device can be omitted, and energy sources are saved.
Description
[ field of technology ]
The invention relates to the technical field of desulfurization of thermal power plants, in particular to a double-tower inverted desulfurization slurry dehydration system.
[ background Art ]
The principle of the gypsum method desulfurization is that limestone or lime is adopted as a desulfurization absorbent, the limestone is crushed and ground into powder, the powder is mixed with water and stirred to form absorption slurry, and when the lime is adopted as the absorbent, the lime powder is digested and then added with water to form absorbent slurry; in the absorption tower, the absorption slurry is contacted and mixed with the flue gas, sulfur dioxide in the flue gas is subjected to chemical reaction with calcium carbonate in the slurry and blown oxidized air so as to be removed, and the final reaction product is gypsum. The main advantages of the gypsum method are: the method has the advantages of wide applicable coal range, high desulfurization efficiency (when Ca/S=1 of some devices), high utilization rate of the absorbent (which can be more than 90%), high equipment operation rate (which can be more than 90%), high working reliability (the most mature flue gas desulfurization process at present), and abundant and cheap source of the desulfurizing agent-limestone. Since limestone is cheap and easy to transport and store, limestone has become the main desulfurizing agent of gypsum method, and the limestone/gypsum forced oxidation system becomes the preferential wet flue gas desulfurization process when flue gas desulfurization equipment of thermal power plants is selected at home and abroad. The gypsum desulfurization is a very complex process, and in the existing gypsum desulfurization process, the problems of energy waste, high production cost, product quality reduction and the like are caused by serious influence on the desulfurization and dehydration effects of gypsum due to the large water content of gypsum, more impurities, abnormal desulfurization system and the like.
[ invention ]
The invention aims to provide a double-tower inverted desulfurization slurry dehydration system so as to solve the problems; the double-tower mutual-pouring desulfurization slurry dehydration system has the advantages that most impurities in gypsum slurry can be removed through reasonable structural design, the double-tower mutual-pouring of slurry can be realized, the dehydration desulfurization effect is good, the production efficiency is high, and the energy is effectively saved.
In order to solve the technical problems, the invention provides the following technical scheme:
a dual tower inverted desulfurization slurry dewatering system comprising:
the absorption tower system comprises a first absorption tower, a second absorption tower, a first backflow main pipe, a second backflow main pipe, a first connecting valve, a second connecting valve, a third connecting valve, a first throttle orifice plate, a second throttle orifice plate, a first switching valve and a second switching valve, wherein the first absorption tower is connected with the first backflow main pipe, and the first connecting valve, the first throttle orifice plate and the first switching valve are sequentially connected with the first backflow main pipe; the second absorption tower is connected with a second backflow main pipe, and a second communication valve, a second throttling orifice plate and a second switching valve are sequentially connected to the second backflow main pipe; a third connecting valve is further connected between the first backflow main pipe and the second backflow main pipe;
the pulp discharging system comprises a first pulp discharging pump, a second pulp discharging pump, a first pulp discharging branch, a second pulp discharging branch, a first combined branch, a second combined branch, a first filter, a second filter, a first electric valve and a second electric valve, wherein the first pulp discharging pump is connected with the first pulp discharging branch, the first pulp discharging branch is connected with the first filter, and the first pulp discharging branch is connected with a first backflow main pipe extending on the first switching valve to form the first combined branch; the second pulp discharging pump is connected with the second pulp discharging branch, a second filter is connected to the second pulp discharging branch, and the second pulp discharging branch is connected with a second backflow main pipe extending on the second switching valve to form a second combined branch; the first combined branch is provided with a first electric valve and a first process waterway externally connected to the first combined branch; the second coupling branch is provided with a second electric valve and a second process waterway externally connected to the second coupling branch;
a switching valve circuit system including a circuit composed of third, fourth, fifth, and sixth switching valves, the switching valve circuit being connected to the first and second combining branches in a lateral direction, respectively; the switching valve loop is also respectively connected with an A gypsum cyclone and a B gypsum cyclone in the longitudinal direction.
Further, a first flushing valve and a first discharge valve are arranged on the first filter, and a second flushing valve and a second discharge valve are arranged on the second filter.
Further, the third connecting valve between the first return main pipe and the second return main pipe is respectively positioned on the first return main pipe between the first connecting valve and the first orifice plate and the second return main pipe between the second connecting valve and the second orifice plate.
Further, the first combined branch is connected with the first electric valve through a first size joint, and the second combined branch is connected with the second electric valve through a second size joint.
Further, a first flushing valve is arranged on the first process water path, and a second flushing valve is arranged on the second process water path.
Compared with the prior art, the invention has the following beneficial effects:
the double-tower inverted desulfurization slurry dehydration system realizes different dehydration requirements through the reasonably arranged switching valve loop, and has strong dehydration function and good effect; the invention can filter most of impurities in gypsum slurry, can realize the cleaning of a filter and the discharge of impurities, and ensures the high-efficiency operation of the system; when the working condition changes or one of the units is stopped, gypsum slurry in the double towers can be mutually slurry through a reasonably designed connecting valve, so that an accident slurry device can be omitted, and energy sources are saved.
[ description of the drawings ]
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and together with the embodiments of the invention and do not constitute a limitation to the invention, and in which:
fig. 1 is a simple structure schematic of the present invention.
In the figure, 11 is a first pulp discharge pump, 12 is a second pulp discharge pump, 21 is a first absorption tower, 22 is a second absorption tower, 31 is a first filter, 32 is a second filter, 311 is a first discharge valve, 312 is a first flushing valve, 321 is a second discharge valve, 322 is a second flushing valve, 41 is a first pulp discharge branch, 42 is a second pulp discharge branch, 51 is a first backflow main pipe, 52 is a second backflow main pipe, 61 is a first connection valve, 62 is a second connection valve, 63 is a third connection valve, 71 is a first throttle orifice plate, 72 is a second throttle orifice plate, 81 is a first switching valve, 82 is a second switching valve, 83 is a third switching valve, 84 is a fourth switching valve, 85 is a fifth switching valve, 86 is a sixth switching valve, 91 is a first size joint, 92 is a second size joint, 101 is a first electric valve, 102 is a second electric valve, 111 is a first combined branch, 112 is a second combined branch, 121 is a first flushing valve, 122 is a second flushing valve, 131 is a first process waterway, 132 is a second process waterway, 14 is an A gypsum cyclone, and 15 is a B gypsum cyclone.
[ detailed description ] of the invention
The invention will be described in further detail with reference to the following detailed description and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications.
A dual tower inverted desulfurization slurry dewatering system comprising:
the absorption tower system comprises a first absorption tower 21, a second absorption tower 22, a first backflow main pipe 51, a second backflow main pipe 52, a first connecting valve 61, a second connecting valve 62, a third connecting valve 63, a first orifice plate 71, a second orifice plate 72, a first switching valve 81 and a second switching valve 82, wherein the first absorption tower 21 is connected with the first backflow main pipe 51, and the first connecting valve 61, the first orifice plate 71 and the first switching valve 81 are sequentially connected to the first backflow main pipe 51; the second absorption tower 22 is connected with a second backflow main pipe 52, and the second backflow main pipe 52 is sequentially connected with a second coupling valve 62, a second orifice plate 72 and a second switching valve 82; a third connecting valve 63 is further connected between the first return main pipe 51 and the second return main pipe 52, and the connecting points of the third connecting valve 63 are respectively positioned on the first return main pipe 51 between the first connecting valve 61 and the first orifice plate 71 and the second return main pipe 52 between the second connecting valve 62 and the second orifice plate 72;
the pulp discharging system comprises a first pulp discharging pump 11, a second pulp discharging pump 12, a first pulp discharging branch 41, a second pulp discharging branch 42, a first combined branch 111, a second combined branch 112, a first filter 31, a second filter 32, a first electric valve 101 and a second electric valve 102, wherein the first pulp discharging pump 11 is connected with the first pulp discharging branch 41, the first pulp discharging branch 41 is connected with the first filter 31, and the first filter 31 is provided with a first flushing valve 312 and a first discharging valve 311; the first pulp discharging branch 41 is connected with a first backflow main pipe 51 extending on the first switching valve 81 to form a first combined branch 111; the second pulp discharging pump 12 is connected with the second pulp discharging branch 42, the second filter 32 is connected with the second pulp discharging branch 42, and the second filter 32 is provided with a second flushing valve 322 and a second discharging valve 321; the second pulp discharging branch 42 is connected with the second backflow main pipe 52 extending on the second switching valve 82 to form a second combined branch 112; the first combining branch 111 is provided with a first electric valve 101 and a first process water path 131 externally connected to the first combining branch 111, and the first process water path 131 is provided with a first flushing valve 121; the second coupling branch 112 is provided with a second electric valve 102, and a second process water path 132 externally connected to the second coupling branch 112, and the second process water path 132 is provided with a second flushing valve 122; the first combining branch 111 is connected with the first electric valve 101 through a first size joint 91, and the second combining branch 112 is connected with the second electric valve 102 through a second size joint 92;
a switching valve circuit system including a circuit composed of a third switching valve 83, a fourth switching valve 84, a fifth switching valve 85, and a sixth switching valve 86, the switching valve circuit being connected to the first combining branch 111 and the second combining branch 112 in the lateral direction, respectively; the switching valve loop is also respectively connected with an A gypsum cyclone 14 and a B gypsum cyclone 15 in the longitudinal direction;
when the gypsum slurry discharging device is used, impurities in gypsum slurry are filtered through the filter by the slurry discharging system, and meanwhile, the flushing valve and the discharging valve on the filter can realize the self cleaning of the filter and the discharging of the impurities; the absorption tower system is under normal conditions, and the two absorption towers operate simultaneously; when one absorption tower fails, the slurry lines of the two absorption towers can be connected and operated through the third channel valve 63 which is reasonably arranged, so that the mutual slurry pouring function of gypsum slurry is realized; the switching valve loop system forms a loop through a third switching valve 83, a fourth switching valve 84, a fifth switching valve 85 and a sixth switching valve 86 which are reasonably arranged, the dewatering function of the switching valve loop system can be realized through the switching valves according to the requirements, and when the switching valve loop is switched to the third switching valve 83 and the fifth switching valve 85, the gypsum cyclone 14 performs dewatering work; when the switching valve circuit is switched to the fourth switching valve 84 and the sixth switching valve 86, the B gypsum cyclone 15 performs a dewatering operation; when the switching valve circuit is switched to the third switching valve 83, the fourth switching valve 84, the fifth switching valve 85, and the sixth switching valve 86, the a gypsum cyclone 14 and the B gypsum cyclone 15 simultaneously perform the dewatering operation.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (3)
1. A twin tower reciprocal desulfurization slurry dewatering system comprising: the absorption tower system comprises a first absorption tower, a second absorption tower, a first backflow main pipe, a second backflow main pipe, a first connecting valve, a second connecting valve, a third connecting valve, a first throttle orifice plate, a second throttle orifice plate, a first switching valve and a second switching valve, wherein the first absorption tower is connected with the first backflow main pipe, and the first connecting valve, the first throttle orifice plate and the first switching valve are sequentially connected with the first backflow main pipe; the second absorption tower is connected with a second backflow main pipe, and a second communication valve, a second throttling orifice plate and a second switching valve are sequentially connected to the second backflow main pipe; a third connecting valve is further connected between the first backflow main pipe and the second backflow main pipe; the pulp discharging system comprises a first pulp discharging pump, a second pulp discharging pump, a first pulp discharging branch, a second pulp discharging branch, a first combined branch, a second combined branch, a first filter, a second filter, a first electric valve and a second electric valve, wherein the first pulp discharging pump is connected with the first pulp discharging branch, the first pulp discharging branch is connected with the first filter, and the first pulp discharging branch is connected with a first backflow main pipe extending on the first switching valve to form the first combined branch; the second pulp discharging pump is connected with the second pulp discharging branch, a second filter is connected to the second pulp discharging branch, and the second pulp discharging branch is connected with a second backflow main pipe extending on the second switching valve to form a second combined branch; the first combined branch is provided with a first electric valve and a first process waterway externally connected to the first combined branch; the second coupling branch is provided with a second electric valve and a second process waterway externally connected to the second coupling branch; a switching valve circuit system including a circuit composed of third, fourth, fifth, and sixth switching valves, the switching valve circuit being connected to the first and second combining branches in a lateral direction, respectively; the switching valve loop is also respectively connected with an A gypsum cyclone and a B gypsum cyclone in the longitudinal direction;
the first filter is provided with a first flushing valve and a first discharge valve, and the second filter is provided with a second flushing valve and a second discharge valve;
and the third connecting valve between the first return main pipe and the second return main pipe is respectively positioned on the first return main pipe between the first connecting valve and the first orifice plate and the second return main pipe between the second connecting valve and the second orifice plate.
2. The dual column inverted desulfurization slurry dewatering system of claim 1, wherein the first combined branch is connected to the first electrically operated valve via a first size joint and the second combined branch is connected to the second electrically operated valve via a second size joint.
3. The dual tower inverted desulfurization slurry dewatering system according to claim 1, wherein a first flush valve is disposed on the first process water path and a second flush valve is disposed on the second process water path.
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| CN201710601035.4A CN107413178B (en) | 2017-07-21 | 2017-07-21 | Double-tower mutually inverted desulfurization slurry dehydration system |
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| CN201710601035.4A CN107413178B (en) | 2017-07-21 | 2017-07-21 | Double-tower mutually inverted desulfurization slurry dehydration system |
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| CN107413178B true CN107413178B (en) | 2023-04-28 |
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2017
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