CN211069630U - Molten salt furnace flue gas desulfurization rich nitrate water treatment system - Google Patents
Molten salt furnace flue gas desulfurization rich nitrate water treatment system Download PDFInfo
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- CN211069630U CN211069630U CN201921681725.6U CN201921681725U CN211069630U CN 211069630 U CN211069630 U CN 211069630U CN 201921681725 U CN201921681725 U CN 201921681725U CN 211069630 U CN211069630 U CN 211069630U
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Abstract
The utility model relates to the technical field of desulfurization waste water, and provides a molten salt furnace flue gas desulfurization saltpeter-rich water treatment system, which comprises a molten salt furnace, a desulfurizing tower and a sedimentation tank, wherein the molten salt furnace is communicated with the desulfurizing tower through a first pipeline, the desulfurizing tower is communicated with the sedimentation tank through a second pipeline and a third pipeline respectively, and a desulfurization pump is arranged on the third pipeline; the device also comprises a fourth pipeline and a concentration tank; one end of the fourth pipeline is communicated with the third pipeline at the output side of the desulphurization pump, and the other end of the fourth pipeline is communicated with the concentration tank; calcium hydroxide aqueous solution is loaded in the concentration tank; the utility model discloses effectively prevented among the doctor solution mirabilite and appeared because of enrichment gradually, ensured the continuity, the stability of normal desulfurization production, a whole set of system simple structure, to the treatment low cost of doctor solution to desulfurization efficiency has been improved greatly.
Description
Technical Field
The utility model relates to a desulfurization waste water technical field especially relates to a rich nitre water processing system of fused salt furnace flue gas desulfurization.
Background
At present, in the production process of preparing caustic soda flakes by using ionic membrane caustic soda, the heat energy required for concentrating liquid caustic soda into caustic soda flakes is supplied by a coal-fired molten salt furnace. Because the sulfur content in the raw coal is about 1 percent, oxides containing sulfur such as sulfur dioxide and the like and oxides containing nitrogen such as nitrogen dioxide and the like are generated after the sulfur in the raw coal is combusted, and the oxides are acid gases, the flue gas of the molten salt furnace can reach the standard and be discharged after being subjected to desulfurization, denitrification and dust removal.
The desulfurization of the flue gas of the molten salt furnace is carried out by adopting a sodium hydroxide alkali liquor absorption method, namely, a desulfurization tower is arranged at the rear side of the molten salt furnace, the flue gas of the molten salt furnace is introduced into the desulfurization tower, the acidic gas is absorbed by adding sodium hydroxide to obtain the alkaline desulfurization solution with the pH value of 8-9, and the alkaline desulfurization solution is recycled to further realize the absorption of the acidic gas.
However, with the recycling of the alkaline desulfurization solution, the content of mirabilite in the desulfurization solution gradually enriches and tends to rise, wherein the mirabilite is sulfate mineral mirabilite, and the main component of the mirabilite is sodium sulfate (Na)2SO4·10H2O). The rising of glauber's salt content can lead to desulfurization reaction to carry out the difficulty, and the glauber's salt is appeared, crystallization can block desulfurizing tower flue gas pipeline in the desulfurizing tower, leads to desulfurizing tower pressure differential to rise, and desulfurization efficiency descends, influences whole desulfurization system's efficiency.
Because the conductivity of the desulfurization solution is extremely high, the desulfurization solution cannot be discharged to a sewage treatment process for treatment, and other good treatment methods are not available, the desulfurization solution is difficult to replace, the content of nitrate in the desulfurization solution is extremely high, the desulfurization reaction is difficult to perform, the flue gas emission index fluctuates and is unqualified, and severe environmental protection pressure is met. Therefore, in the traditional flue gas treatment process of the coal-fired molten salt furnace, the desulfurization wastewater treatment difficulty is very high, the desulfurization solution cannot be reasonably replaced, the continuity and stability of normal desulfurization production are seriously influenced, and the serious environmental protection problem is faced.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model aims at providing a molten salt furnace flue gas desulfurization rich nitrate water treatment system for solve in traditional coal-fired molten salt furnace flue gas treatment process, mirabilite can be because of enriching gradually and appear in the doctor solution, and the doctor solution can not obtain reasonable replacement, seriously influences the problem of the continuity of normal desulfurization production, stability.
(II) technical scheme
In order to solve the technical problem, the utility model provides a molten salt furnace flue gas desulfurization saltpeter-rich water treatment system, which comprises a molten salt furnace, a desulfurization tower and a sedimentation tank, wherein the molten salt furnace is communicated with the desulfurization tower through a first pipeline, the desulfurization tower is communicated with the sedimentation tank through a second pipeline and a third pipeline respectively, and a desulfurization pump is arranged on the third pipeline; the device also comprises a fourth pipeline and a concentration tank; one end of the fourth pipeline is communicated with the third pipeline at the output side of the desulfurization pump, and the other end of the fourth pipeline is communicated with the concentration tank; the concentration tank is loaded with calcium hydroxide aqueous solution.
Preferably, the utility model also comprises a fifth pipeline, a generator and a sixth pipeline; two ends of the fifth pipeline are respectively communicated with the concentration tank and the generator, and a clean water pump is arranged on the fifth pipeline; the generator is filled with calcium carbide; and two ends of the sixth pipeline are respectively communicated with the generator and the concentration tank.
Preferably, in the present invention, the desulfurizing tower is located at an upper side of the settling tank, and the generator is located at an upper side of the concentration tank.
Preferably, in the utility model discloses in the generator intercommunication acetylene collection device.
Preferably, the desulfurization tower of the utility model is provided with a flue gas inlet and a liquid outlet, and the desulfurization tower is internally provided with a spray device;
one end of the first pipeline is communicated with a smoke discharge port of the molten salt furnace, and the other end of the first pipeline is communicated with the smoke inlet; one end of the second pipeline is communicated with the liquid outlet, and the other end of the second pipeline extends to the sedimentation tank; one end of the third pipeline is communicated with the spraying device, and the other end of the third pipeline extends to the sedimentation tank.
Preferably, the utility model discloses in the first governing valve is equipped with on the third pipeline of desulfurization pump output side, the second governing valve is equipped with on the fourth pipeline.
Preferably, in the present invention, a remote pressure gauge and a first remote flow meter are further installed on a third pipeline on the output side of the desulfurization pump, and the remote pressure gauge is located between the desulfurization pump and the first regulating valve; the fourth pipeline is also provided with a second remote flowmeter;
the first regulating valve and the second regulating valve are respectively self-control valves;
the remote pressure gauge, the first remote flowmeter, the second remote flowmeter, the first regulating valve, the second regulating valve and the desulfurization pump are respectively connected with a DCS system.
(III) technical effects
The utility model provides a rich nitre water processing system of molten salt furnace flue gas desulfurization, absorb the sour acid gas who contains sulphur that the molten salt furnace discharged by the desulfurizing tower, and discharge alkaline desulfurization liquid to the sedimentation tank with this, in order to prevent alkaline desulfurization liquid in carrying out the gradual enrichment of desulfurization circulation in-process content and appearing, carry the alkaline desulfurization liquid of the partly circulation flow of desulfurization pump pumping through the fourth pipeline to the concentration tank in, thereby calcium ion and sulfate radical ion in the concentration tank combine to form calcium sulfate precipitation, and behind the concentrated processing of concentration tank, generate supernatant and the precipitate of being convenient for discharge recycle.
By the above, the utility model discloses effectively prevented among the doctor solution that mirabilite from appearing because of enrichment gradually, ensured the continuity, the stability of normal desulfurization production, a whole set of system simple structure to the treatment low cost of doctor solution to desulfurization efficiency has been improved greatly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a molten salt furnace flue gas desulfurization nitrate-enriched water treatment system in an embodiment of the present invention.
In the figure: the method comprises the following steps of 1-molten salt furnace, 2-desulfurizing tower, 3-sedimentation tank, 4-first pipeline, 5-second pipeline, 6-third pipeline, 7-fourth pipeline, 8-fifth pipeline, 9-sixth pipeline, 10-desulfurizing pump, 11-concentration tank, 12-generator, 13-clear water pump, 14-acetylene collecting device, 15-first regulating valve, 16-second regulating valve, 17-remote pressure gauge, 18-first remote flow meter and 19-second remote flow meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the embodiment provides a molten salt furnace 1 flue gas desulfurization nitrate-rich water treatment system, which includes a molten salt furnace 1, a desulfurization tower 2 and a sedimentation tank 3, wherein the molten salt furnace 1 is communicated with the desulfurization tower 2 through a first pipeline 4, the desulfurization tower 2 is communicated with the sedimentation tank 3 through a second pipeline 5 and a third pipeline 6 respectively, and a desulfurization pump 10 is installed on the third pipeline 6; also comprises a fourth pipeline 7 and a concentration tank 11; one end of a fourth pipeline 7 is communicated with the third pipeline 6 at the output side of the desulphurization pump 10, and the other end of the fourth pipeline 7 is communicated with a concentration tank 11; the concentration tank 11 is charged with an aqueous solution of calcium hydroxide.
As can be seen from the structure shown in FIG. 1, when the flue gas desulfurization and saltpeter-rich water treatment system of the molten salt furnace 1 is in operation, the sulfur-containing acidic gas (SO) generated by the combustion of coal in the molten salt furnace 12) Is discharged to a desulfurizing tower 2 through a first pipeline 4, and acidic gas (SO) is treated by sodium hydroxide lye in the desulfurizing tower 22) Absorbing and discharging alkaline desulfurization solution to the sedimentation tank 3, wherein the alkaline desulfurization solution in the sedimentation tank 3 is pumped by a desulfurization pump 10 and returns to the desulfurization tower 2 along a third pipeline 6 to participate in the acid gas (SO) reaction again2) And circulating the solution; in order to prevent the gradual enrichment and separation of mirabilite content in the alkaline desulfurization solution during the desulfurization circulation process, the desulfurization solution is desulfurized through a fourth pipeline 7A part of the circularly flowing alkaline desulfurization solution pumped by the pump 10 is conveyed to the concentration tank 11, so that calcium ions and sulfate ions in the concentration tank 11 are combined to form calcium sulfate precipitate, and after concentration treatment of the concentration tank 11, supernatant liquid and precipitate convenient for discharge and reuse are generated, thereby achieving the purpose of reducing the content of mirabilite in the alkaline desulfurization solution, realizing effective treatment of the alkaline desulfurization solution, and preventing the direct discharge of the alkaline desulfurization solution from polluting the environment.
From this, molten salt furnace 1 flue gas desulfurization rich saltwater processing system described in this embodiment has effectively prevented that the glauber's salt from appearing because of enriching gradually in the desulfurization liquid, has ensured the continuity, the stability of normal desulfurization production, and whole set of system simple structure is to the treatment low cost of desulfurization liquid to desulfurization efficiency has been improved greatly.
Further, the embodiment further includes a fifth pipeline 8, a generator 12 and a sixth pipeline 9; two ends of a fifth pipeline 8 are respectively communicated with a concentration tank 11 and a generator 12, and a clean water pump 13 is arranged on the fifth pipeline 8; calcium carbide is contained in the generator 12; the two ends of the sixth pipeline 9 are respectively communicated with the generator 12 and the concentration tank 11.
Specifically, when the alkaline desulfurization solution is treated, the supernatant in the concentration tank 11 is pumped by the clean water pump 13 and conveyed to the generator 12 along the fifth pipeline 8, and water and calcium carbide (CaC) in the generator 12 are mixed with calcium carbide (Ca)2) The reaction is carried out to generate acetylene gas and calcium hydroxide, and the obtained calcium hydroxide aqueous solution is conveyed to a concentration tank 11 through a sixth pipeline 9, so that calcium ions and sulfate ions are combined to form calcium sulfate precipitate, and the aim of reducing the mirabilite content in the recycled alkaline desulfurization solution is fulfilled.
Further, in the present embodiment, the desulfurization tower 2 is located on the upper side of the sedimentation tank 3, and the generator 12 is located on the upper side of the concentration tank 11, so that the alkaline desulfurization solution generated by the desulfurization reaction in the desulfurization tower 2 is conveniently discharged to the sedimentation tank 3 along the second pipeline 5 under the action of the self weight thereof, and the calcium hydroxide aqueous solution generated by the reaction in the generator 12 is also conveniently conveyed to the concentration tank 11 through the sixth pipeline 9 under the action of the self weight thereof.
Further, the generator 12 in this embodiment is connected to the acetylene collecting device 14, so that the flue gas discharged from the molten salt furnace 1 can be desulfurized and the acetylene can be prepared and stored at the same time.
Further, in this embodiment, the desulfurizing tower 2 is provided with a flue gas inlet and a liquid outlet, and the desulfurizing tower 2 is provided with a spraying device; one end of the first pipeline 4 is communicated with a flue gas discharge port of the molten salt furnace 1, and the other end of the first pipeline is communicated with a flue gas inlet on the desulfurizing tower 2; one end of the second pipeline 5 is communicated with a liquid outlet on the desulfurizing tower 2, and the other end extends to the sedimentation tank 3; one end of the third pipeline 6 is communicated with the spray device in the desulfurizing tower 2, and the other end extends to the sedimentation tank 3.
By the structure shown in figure 1, the flue gas inlet and the liquid outlet are both arranged at the bottom of the desulfurizing tower 2, and the spraying device is arranged at the top of the inner side of the desulfurizing tower 2, so that the flue gas introduced into the desulfurizing tower 2 can gradually react with the alkali liquor sprayed in the spraying device in the ascending process from bottom to top, the contact time with the alkali liquor is greatly prolonged, and the desulfurizing effect is ensured.
Further, in this embodiment, the third pipe 6 on the output side of the desulfurization pump 10 is provided with a first regulating valve 15, and the fourth pipe 7 is provided with a second regulating valve 16.
Specifically, the flow rate of the alkaline desulfurization solution participating in the desulfurization cycle of flue gas along the third piping 6 can be controlled by adjusting the opening degree of the first regulating valve 15, and the flow rate of the alkaline desulfurization solution participating in the shift substitution can be controlled by controlling the opening degree of the second regulating valve 16.
Further, in the embodiment, a remote pressure gauge 17 and a first remote flow meter 18 are further installed on the third pipeline 6 on the output side of the desulfurization pump 10, and the remote pressure gauge 17 is located between the desulfurization pump 10 and the first regulating valve 15; the fourth pipeline 7 is also provided with a second remote flowmeter 19; the first regulating valve 15 and the second regulating valve 16 are self-control valves respectively; the remote pressure gauge 17, the first remote flow meter 18, the second remote flow meter 19, the first regulating valve 15, the second regulating valve 16 and the desulfurization pump 10 are respectively connected with the DCS system.
The model of the remote pressure gauge 17 is WAN L IN-TP9002, the model of the first remote flow meter 18 and the model of the second remote flow meter 19 are L ZB-YF-40, the DCS system adopts a decentralized control system based on a microprocessor, which is well known IN the art, the remote pressure gauge 17, the first remote flow meter 18 and the second remote flow meter 19 are respectively connected with input ports of corresponding control modules IN the DCS system, and output ports of the corresponding control modules IN the DCS system output corresponding control instructions, so as to respectively realize real-time control over the working states of the first regulating valve 15, the second regulating valve 16 and the desulfurization pump 10.
Specifically, the DCS system controls the rotation speed of the desulfurization pump 10 in real time (controls the operating frequency of the desulfurization pump 10 through a corresponding switching circuit to adjust the rotation speed thereof) according to the pressure value of the alkaline desulfurization solution flowing on the third pipeline 6, which is acquired by the remote pressure gauge 17 in real time; meanwhile, the DCS controls the opening degree of the first regulating valve 15 and the second regulating valve 16 on the corresponding pipelines according to the flow value monitored by the first remote flow meter 18 or the second remote flow meter 19 in real time.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. The molten salt furnace flue gas desulfurization nitrate-enriched water treatment system comprises a molten salt furnace, a desulfurization tower and a sedimentation tank, wherein the molten salt furnace is communicated with the desulfurization tower through a first pipeline;
one end of the fourth pipeline is communicated with the third pipeline on the output side of the desulfurization pump, the other end of the fourth pipeline is communicated with the concentration tank, and the concentration tank is loaded with a calcium hydroxide aqueous solution.
2. The molten salt furnace flue gas desulfurization nitrate-enriched water treatment system according to claim 1, characterized by further comprising a fifth pipeline, a generator and a sixth pipeline;
two ends of the fifth pipeline are respectively communicated with the concentration tank and the generator, and a clean water pump is arranged on the fifth pipeline;
the generator is filled with calcium carbide;
and two ends of the sixth pipeline are respectively communicated with the generator and the concentration tank.
3. The molten salt furnace flue gas desulfurization nitrate-rich water treatment system as claimed in claim 2, wherein the desulfurization tower is located at an upper side of the sedimentation tank, and the generator is located at an upper side of the concentration tank.
4. The molten salt furnace flue gas desulfurization nitrate-rich water treatment system as claimed in claim 2, wherein the generator is communicated with an acetylene collecting device.
5. The molten salt furnace flue gas desulfurization nitrate-enriched water treatment system as claimed in claim 1, wherein a flue gas inlet and a liquid outlet are arranged on the desulfurization tower, and a spray device is arranged in the desulfurization tower;
one end of the first pipeline is communicated with a smoke discharge port of the molten salt furnace, and the other end of the first pipeline is communicated with the smoke inlet; one end of the second pipeline is communicated with the liquid outlet, and the other end of the second pipeline extends to the sedimentation tank; one end of the third pipeline is communicated with the spraying device, and the other end of the third pipeline extends to the sedimentation tank.
6. The molten salt furnace flue gas desulfurization nitrate-rich water treatment system as claimed in any one of claims 1 to 5, wherein a first regulating valve is installed on a third pipeline on the output side of the desulfurization pump, and a second regulating valve is installed on a fourth pipeline.
7. The molten salt furnace flue gas desulfurization nitrate-rich water treatment system according to claim 6, characterized in that a remote pressure gauge and a first remote flow meter are further installed on a third pipeline on the output side of the desulfurization pump, and the remote pressure gauge is positioned between the desulfurization pump and the first regulating valve; the fourth pipeline is also provided with a second remote flowmeter;
the first regulating valve and the second regulating valve are respectively self-control valves;
the remote pressure gauge, the first remote flowmeter, the second remote flowmeter, the first regulating valve, the second regulating valve and the desulfurization pump are respectively connected with a DCS system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921681725.6U CN211069630U (en) | 2019-10-09 | 2019-10-09 | Molten salt furnace flue gas desulfurization rich nitrate water treatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921681725.6U CN211069630U (en) | 2019-10-09 | 2019-10-09 | Molten salt furnace flue gas desulfurization rich nitrate water treatment system |
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| CN211069630U true CN211069630U (en) | 2020-07-24 |
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| CN201921681725.6U Active CN211069630U (en) | 2019-10-09 | 2019-10-09 | Molten salt furnace flue gas desulfurization rich nitrate water treatment system |
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