CN217212579U - Desulfurization slurry sulfite monitoring system - Google Patents
Desulfurization slurry sulfite monitoring system Download PDFInfo
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- CN217212579U CN217212579U CN202221102848.1U CN202221102848U CN217212579U CN 217212579 U CN217212579 U CN 217212579U CN 202221102848 U CN202221102848 U CN 202221102848U CN 217212579 U CN217212579 U CN 217212579U
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Abstract
The utility model relates to a desulfurization thick liquid sulfite monitoring system, include: a desulfurization unit; the oxidation pipeline is connected with the desulfurization device and is provided with an oxidation fan; the sampling pipeline is connected with the desulfurization device, the sampling pipeline is provided with a sulfite detection device, and the sulfite detection device is electrically connected with the oxidation fan. The utility model provides a desulfurization thick liquid sulfite monitoring system passes through the sample pipeline and is connected with desulphurization unit for but the sulfite concentration of the desulfurization thick liquid of sample pipeline's sulfite detection device real-time supervision desulphurization unit, and be connected with the oxidation fan electricity through sulfite detection device, adjust the power of oxidation fan in real time according to the sulfite concentration that detects, then adjust desulphurization unit's oxygen supply volume, thereby avoid taking place the oxygen suppliment surplus or the oxygen suppliment is not enough to lead to desulfurization thick liquid peroxide, the phenomenon of oxygen starvation.
Description
Technical Field
The utility model relates to a waste gas treatment technical field, in particular to desulfurization thick liquid sulfite monitoring system.
Background
At present, most thermal power plants adopt forced oxidation to carry out aeration treatment on desulfurization slurry in a desulfurization tower, and sulfite is oxidized into sulfate, so that the desulfurization slurry is dehydrated to obtain byproduct gypsum. The concentration of sulfite can reflect the oxidation degree of the desulfurization slurry to a certain extent.
In the process of aerating the desulfurization slurry, under-oxidation or over-oxidation occurs. The slurry is damaged by underoxidation and overoxidation. In order to adapt to the changes of unit load and coal types, the oxidation air quantity needs to be adjusted at any time. Therefore, the industry generally detects the concentration of sulfite in the desulfurization slurry in an off-line mode or an on-line mode. In the off-line mode, sulfite is measured after sampling slurry, the oxidation air volume is adjusted according to the result, and specifically, the sulfite in the sample components is measured and analyzed in a field or an external laboratory (usually once sampling for a week), so that the measurement error is large, the off-line measurement is delayed, and the oxidation air volume cannot be adjusted in time; on-line measuring sulfite indirectly by detecting pH value and ORP oxidation-reduction potential in the desulfurizing tower, but the sulfite concentration cannot be represented accurately by the indirect measurement of the pH value, besides sulfite, other factors can influence the pH value, and the change of the pH value is very quick under certain conditions; the ORP hyperbola corresponds to low sulfite concentrations, with low sensitivity of ORP correlation in the medium to high sulfite concentration range, and ORP values are also affected by other constituents. Therefore, a solution that can measure sulfite directly in time and adjust the amount of oxidation in time is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a desulfurization slurry sulphite monitoring system, the desulfurization slurry who aims at solving current desulfurizing tower emission has peroxide, the technical problem of the under oxidation phenomenon.
In order to achieve the above object, the utility model provides a desulfurization slurry sulfite monitoring system, include:
a desulfurization unit;
the oxidation pipeline is connected with the desulfurization device and is provided with an oxidation fan;
the sampling pipeline is connected with the desulfurization device, the sampling pipeline is provided with a sulfite detection device, and the sulfite detection device is electrically connected with the oxidation fan.
As a further improvement of the utility model: the sampling pipeline is connected with a cleaning pipeline and comprises sampling pipelines, and the two ends of each sampling pipeline are respectively connected with the desulfurization device and the sulfite detection device; the cleaning pipeline comprises a cleaning pipeline, one end of the cleaning pipeline is communicated with the sampling pipeline, and the other end of the cleaning pipeline is connected with a water storage tank.
As a further improvement of the utility model: the cleaning pipeline is connected with a cleaning valve, the sampling pipeline is connected with a sampling valve, the cleaning valve and the sampling valve are both provided with control ends, and the control ends of the cleaning valve and the sampling valve are connected in series.
As a further improvement of the utility model: the sampling pipeline is connected with a discharge pipeline, the discharge pipeline comprises a discharge pipeline, one end of the discharge pipeline is connected with the sulfite detection device, and the other end of the discharge pipeline is connected with a wastewater pond.
As a further improvement of the utility model: the sulfite detection device comprises a sulfite analyzer.
As a further improvement of the utility model: still include agitating unit, agitating unit is located bottom in the desulphurization unit, the one end of sample pipeline connect in desulphurization unit's bottom, the sample valve set up in the sample pipeline is close desulphurization unit's one end.
As a further improvement of the utility model: the sampling pipeline is connected with a return pipeline, the return pipeline comprises a return pipeline, one end of the return pipeline is connected with the desulfurization device, and the other end of the return pipeline is communicated with the sampling pipeline.
As a further improvement of the utility model: the backflow pipeline comprises a first backflow valve, a second backflow valve and a backflow pump, the first backflow valve is arranged at one end, close to the sulfite detection device, of the sampling pipeline, the second backflow valve is arranged at one end, close to the desulfurization device, of the backflow pipeline, and the backflow pump is arranged on the backflow pipeline between the first backflow valve and the second backflow valve.
As a further improvement of the utility model: the sampling valve, the reflux pump and the second reflux valve are all provided with control ends, the control end of the sampling valve and the control end of the reflux pump are connected in series, and the control end of the second reflux valve is connected in series.
As a further improvement of the utility model: the stirring device comprises a paddle stirrer.
The desulfurization slurry sulfite monitoring system of the technical scheme comprises: a desulfurization unit; the oxidation pipeline is connected with the desulfurization device and is provided with an oxidation fan; the sampling pipeline is connected with the desulfurization device, the sampling pipeline is provided with a sulfite detection device, and the sulfite detection device is electrically connected with the oxidation fan. The utility model provides a desulfurization thick liquid sulfite monitoring system passes through the sample pipeline and is connected with desulphurization unit for but the sulfite concentration of the desulfurization thick liquid of sample pipeline's sulfite detection device real-time supervision desulphurization unit, and be connected with the oxidation fan electricity through sulfite detection device, adjust the power of oxidation fan in real time according to the sulfite concentration that detects, then adjust desulphurization unit's oxygen supply volume, thereby avoid taking place the oxygen suppliment surplus or the oxygen suppliment is not enough to lead to desulfurization thick liquid peroxide, the phenomenon of oxygen starvation.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a desulfurized slurry sulfite monitoring system according to a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a desulfurization slurry sulfite monitoring system according to a second embodiment of the present disclosure.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Under-oxidation or over-oxidation occurs during the aeration of the desulfurization slurry. The slurry is damaged by underoxidation and overoxidation. The occurrence of the underoxidation phenomenon is easy to cause the following hazards: 1. the sulfite concentration is too high due to insufficient oxidation, and the system equipment is seriously scaled, so that the safe operation of the system equipment is endangered; 2. the sulfur dioxide is released after decomposition and then returns to the flue gas, so that the desulfurization efficiency is reduced; 3. the excessive sulfite in the gypsum slurry is caused by insufficient oxidation, qualified gypsum crystals cannot be generated, the particle size of calcium sulfite is small, the gypsum is difficult to dehydrate, and the quality of the gypsum is reduced; 4. insufficient oxidation causes high concentrations of sulfite to coat limestone particles preventing their dissolution, causing limestone occlusion, resulting in a decrease in desulfurization efficiency.
When the peroxidation phenomenon occurs, the following hazards are easily caused: 1. excessive oxidation results in reduced sulfite, producing excess oxygen; 2. excessive oxidation results in more dissolved oxygen causing more corrosion risk; 3. excess oxidizing gas is not consumed, and bubbles in the system cause corrosion risks; 4. the risk that excessive oxidation results in the ORP redox potential will operate at high levels causing increased mercury emissions; 5. excessive oxidation is not favorable for removing selenate in subsequent wastewater treatment.
The utility model provides a desulfurization slurry sulfite monitoring system aims at solving the technical problem that the desulfurization slurry that current desulfurizing tower discharged exists peroxide, the phenomenon of short oxidation.
Example one
Referring to fig. 1, in the present embodiment, a desulfurization slurry sulfite monitoring system includes:
a desulfurizer 11;
the oxidation pipeline is connected with the desulfurization device 11 and is provided with an oxidation fan 51;
the sampling pipeline is connected with the desulfurization device 11, the sampling pipeline is provided with a sulfite detection device 21, and the sulfite detection device 21 is electrically connected with the oxidation fan 51.
The desulfurization device 11 of this embodiment adopts the desulfurizing tower for the flue gas that contains sulfur dioxide that thermal power factory produced purifies. The oxidation pipeline comprises an oxidation pipeline 52, and an oxidation fan 51 arranged on the oxidation pipeline 52 can be used for supplying oxidation gas, such as oxygen, to the desulfurization tower, wherein the oxidation gas oxidizes limestone desulfurization slurry containing sulfite in the desulfurization tower into sulfate desulfurization slurry, and the sulfate desulfurization slurry is dehydrated to obtain byproduct gypsum. The sulfite detecting device 21 employs a sulfurous acid analyzer for detecting the concentration of sulfite in the desulfurization slurry, and then obtains the oxidation degree of the desulfurization slurry. When the concentration of the sulfite in the desulfurization slurry does not meet the discharge condition, accelerating or maintaining the oxidation rate of the sulfite by increasing or maintaining the power of an oxidation fan; when the concentration of sulfite in the desulfurization slurry meets the discharge condition, namely the desulfurization slurry reaches the oxidation degree meeting the condition, the desulfurization slurry is discharged, the power of an oxidation fan is reduced, and the energy consumption of a power supply is saved.
The utility model provides a desulfurization thick liquid sulfite monitoring system passes through the sample pipeline and is connected with desulphurization unit for but the sulfite concentration of the desulfurization thick liquid of sample pipeline's sulfite detection device real-time supervision desulphurization unit, and be connected with the oxidation fan electricity through sulfite detection device, adjust the power of oxidation fan in real time according to the sulfite concentration that detects, then adjust desulphurization unit's oxygen supply volume, thereby avoid taking place the oxygen suppliment surplus or the oxygen suppliment is not enough to lead to desulfurization thick liquid peroxide, the phenomenon of oxygen starvation.
Further, the sampling pipeline is connected with a cleaning pipeline, the sampling pipeline comprises a sampling pipeline 31, two ends of the sampling pipeline are respectively connected with the desulfurization device 11 and the sulfite detection device 21, and a sampling valve 32 for conducting or closing the sampling pipeline 31 is arranged on the sampling pipeline 31; the cleaning pipeline comprises a cleaning pipeline 42, one end of the cleaning pipeline 42 is communicated with the sampling pipeline 31, the other end of the cleaning pipeline 42 is connected with the water storage tank 12, and a cleaning valve 41 for switching on or off the cleaning pipeline 42 is arranged on the cleaning pipeline 42.
During the sampling of the desulfurization slurry, the sampling valve 32 is opened, and the desulfurization slurry in the desulfurization apparatus 11 flows to the sulfite monitoring apparatus 21 through the sampling pipe 31. When the desulfurization slurry flows out from the desulfurization device 11, the water storage tank 12 stores industrial water, the purge valve 41 of the purge pipe 42 is opened, and the industrial water flows through the purge pipe 42 to flush the desulfurization slurry, so that the desulfurization slurry reaches the consistency meeting the detection, which is beneficial to the accurate detection of the sulfite monitoring device 21.
Further, the cleaning pipeline 42 is connected with a cleaning valve 41, the cleaning valve 41 and the sampling valve 32 are both provided with control ends, and the control end of the cleaning valve 41 is connected in series with the control end of the sampling valve 32.
The control end of the cleaning valve 41 and the control end of the sampling valve 32 are connected in series, so that the cleaning valve 41 and the sampling valve 32 can be opened or closed together during working, and a control circuit is simplified through common control.
Further, the sampling pipeline is connected with a discharge pipeline, the discharge pipeline comprises a discharge pipeline 22, one end of the discharge pipeline 22 is connected with the sulfite detection device 21, the other end of the discharge pipeline is connected with a wastewater pond 24, and a discharge valve 23 for opening or closing the discharge pipeline 22 is arranged on the discharge pipeline 22. After the sampling is completed, the discharge valve 23 is opened, and the sampled desulfurization slurry flows to the wastewater tank 24 through the discharge pipe 22, and since the wastewater tank 24 may contain desulfurization slurry that does not satisfy the discharge condition, the desulfurization slurry is collected by the wastewater tank 24 for further treatment in the following.
To sum up, the desulfurization thick liquid sulfite monitoring system of this application can be according to the sulfite concentration real-time regulation oxidation fan's that detects power, then the oxygen supply volume of governing system not only can avoid taking place desulfurization thick liquid peroxide, the phenomenon of under-oxidation. In addition, because the power of the oxidation fan can be automatically adjusted, the system also has the following advantages: the power consumption of the oxidation fan can be saved, and the risk of system corrosion caused by excessive dissolved oxygen is avoided; the risk of corrosion of the system caused by bubbling of excess oxidizing gas in the system can be avoided; the system can be prevented from being blocked due to limestone scaling; can improve the quality of gypsum; the secondary leakage of mercury in the flue gas can be reduced by 85%; the mercury concentration in the wastewater treatment system can be reduced to <1 mug/l; selenate in the wastewater can be reduced by 45%; the waste water can be treated more easily and at lower cost.
Example two
Referring to fig. 2, the difference between the present embodiment and the first embodiment is that the desulfurization slurry sulfite monitoring system further includes a stirring device 33. This agitating unit 33 is used for making the more homogeneous mixing of desulfurization thick liquid through the stirring, improves sample detection's accuracy then.
The stirring device 33 is located at the bottom of the inside of the desulfurization device 11, one end of the sampling pipe 31 is connected to the bottom of the desulfurization device 11, and the sampling valve 32 is arranged at one end of the sampling pipe 31 close to the desulfurization device 11.
In this embodiment, sampling pipe 11 and sample valve 32 set up in agitating unit 33's bottom, because the entry of sampling pipe 11 is close agitating unit 33, are favorable to sampling pipe 11 to acquire the desulfurization slurry of more homogeneous mixing in desulphurization unit 11, then further improve the accuracy of sample detection.
Further, the sampling pipeline is connected with a return pipeline, the return pipeline comprises a return pipeline 63, one end of the return pipeline 63 is connected with the desulfurization device 11, and the other end of the return pipeline 63 is communicated with the sampling pipeline 31.
In this embodiment, the return line is used to discharge the desulfurized slurry having an excessively long residence time in the sampling pipe 31. Because the sampling test is intermittent detection, partial desulfurization thick liquid can be detained in sampling pipe 31 when sulfite monitoring devices 21 stop detecting, and desulfurization thick liquid is detained the overlength and can influence the concentration of sulfite, consequently sets up the return line and can make its backward flow to desulphurization unit 11, avoids the desulfurization thick liquid of this part to influence the detection of sulfite monitoring devices 21.
Further, the return line includes a first return valve 61, a second return valve 64, and a return pump 62, the first return valve 61 is disposed at an end of the sampling pipe 31 close to the sulfite detecting device 21, the second return valve 62 is disposed at an end of the return pipe 63 close to the desulfurization device 11, and the return pump 62 is disposed on the return pipe 63 between the first return valve 61 and the second return valve 64.
In the present embodiment, by disposing the first return valve 61 at the end close to the sulfite detecting device 21 and by disposing the second return valve 62 at the end of the return pipe 63 close to the desulfurization device 11, the purpose is to return all the retained desulfurization slurry in the sampling pipe 31 and the return pipe 63 to the desulfurization device 11 as much as possible, thereby ensuring the accuracy of sampling detection.
Further, the sampling valve 32, the reflux pump 62 and the second reflux valve 64 are all provided with control ends, and the control ends of the sampling valve 32, the reflux pump 62 and the second reflux valve 64 are connected in series.
When desulfurization slurry needs to flow back, the system can realize the backflow of the desulfurization slurry by opening the sampling valve 32, the reflux pump 62 and the second reflux valve 64 and closing the first reflux valve 61. The control end of the sampling valve 32, the control end of the return pump 62 and the control end of the second return valve 64 are connected in series, so that the sampling valve 32, the return pump 62 and the second return valve 64 can be opened or closed together during working, and the control circuit is simplified through common control.
Further, in the present embodiment, the stirring device 33 employs a paddle stirrer. The paddle type stirrer is more suitable for stirring the desulfurization slurry with higher viscosity in the desulfurization tower due to the large size, low rotating speed and large stirring range of the paddle.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. A desulfurized slurry sulfite monitoring system comprising:
a desulfurization unit;
the oxidation pipeline is connected with the desulfurization device and is provided with an oxidation fan;
the sampling pipeline is connected with the desulfurization device, the sampling pipeline is provided with a sulfite detection device, and the sulfite detection device is electrically connected with the oxidation fan.
2. The desulfurization slurry sulfite monitoring system according to claim 1, wherein the sampling pipeline is connected with a cleaning pipeline, and comprises a sampling pipeline with two ends respectively connected with the desulfurization device and the sulfite detection device; the cleaning pipeline comprises a cleaning pipeline, one end of the cleaning pipeline is communicated with the sampling pipeline, and the other end of the cleaning pipeline is connected with a water storage tank.
3. The desulfurization slurry sulfite monitoring system of claim 2, wherein a purge valve is connected to the purge conduit, a sampling valve is connected to the sampling conduit, the purge valve and the sampling valve are each provided with a control end, and the control end of the purge valve is connected in series with the control end of the sampling valve.
4. The desulfurization slurry sulfite monitoring system of claim 1, wherein a discharge line is connected to the sampling line, the discharge line comprising a discharge conduit, one end of the discharge conduit being connected to the sulfite detection device, the other end of the discharge conduit being connected to a wastewater pond.
5. The desulfurization slurry sulfite monitoring system of claim 1, wherein the sulfite detection means comprises a sulfurous acid analyzer.
6. The desulfurization slurry sulfite monitoring system according to claim 3, further comprising a stirring device positioned at the bottom inside the desulfurization device, wherein one end of the sampling pipe is connected to the bottom of the desulfurization device, and wherein the sampling valve is disposed at one end of the sampling pipe close to the desulfurization device.
7. The desulfurization slurry sulfite monitoring system according to claim 6, wherein a return line is connected to the sampling line, the return line comprising a return pipe, one end of the return pipe being connected to the desulfurization device, the other end of the return pipe being in communication with the sampling line.
8. The desulfurization slurry sulfite monitoring system according to claim 7, wherein the return line comprises a first return valve, a second return valve, and a return pump, the first return valve is disposed at an end of the sampling pipe near the sulfite detecting device, the second return valve is disposed at an end of the return pipe near the desulfurization device, and the return pump is disposed on the return pipe between the first return valve and the second return valve.
9. The desulfurization slurry sulfite monitoring system of claim 8, wherein the sampling valve, the reflux pump and the second reflux valve are each provided with a control end, the control ends of the sampling valve and the reflux pump are connected in series.
10. The desulfurization slurry sulfite monitoring system of claim 6, wherein the agitation means comprises a paddle agitator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115825192A (en) * | 2022-11-09 | 2023-03-21 | 华能重庆珞璜发电有限责任公司 | Cleaning device and cleaning method for desulfurization slurry parameter measurement electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825192A (en) * | 2022-11-09 | 2023-03-21 | 华能重庆珞璜发电有限责任公司 | Cleaning device and cleaning method for desulfurization slurry parameter measurement electrode |
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