CN224202820U - PH and density detection system for wet desulfurization process - Google Patents
PH and density detection system for wet desulfurization processInfo
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- CN224202820U CN224202820U CN202521055961.2U CN202521055961U CN224202820U CN 224202820 U CN224202820 U CN 224202820U CN 202521055961 U CN202521055961 U CN 202521055961U CN 224202820 U CN224202820 U CN 224202820U
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Abstract
本实用新型公开了一种湿法脱硫工艺PH和密度检测系统，包括多个采样支管、采样总管和检测罐；采样支管的数量与脱硫塔上循环泵的数量相对应，每个采样支管的一端连接所述循环泵的出口，另一端连接采样总管，所述采样总管与检测罐底部的浆液进口相连，所述检测罐上设置PH计接口、压差密度计接口和溢流口，所述溢流口通过管道与脱硫塔相连；本实用新型通过循环泵出口采样的方式，可以实时全面采集到塔内各方位位置的浆液，从而提高了PH及密度检测数据的准确性；通过正压采样方式，可以避免静压自流方式导致的管道堵塞；通过分支管头端的电动调节阀，可以平衡各分支采样管路的流量，控制采样浆液的流速，保证流动稳定且减少仪表探头的磨损。
This invention discloses a pH and density detection system for a wet desulfurization process, comprising multiple sampling branch pipes, a sampling main pipe, and a detection tank. The number of sampling branch pipes corresponds to the number of circulating pumps on the desulfurization tower. One end of each sampling branch pipe is connected to the outlet of the circulating pump, and the other end is connected to the sampling main pipe. The sampling main pipe is connected to the slurry inlet at the bottom of the detection tank. The detection tank is equipped with a pH meter interface, a differential pressure density meter interface, and an overflow port. The overflow port is connected to the desulfurization tower via a pipeline. This invention, by sampling from the outlet of the circulating pump, can collect slurry data from all directions within the tower in real time, thereby improving the accuracy of pH and density detection data. The positive pressure sampling method avoids pipe blockage caused by static pressure gravity flow. The electric regulating valve at the branch pipe head can balance the flow rate of each branch sampling pipe, control the flow rate of the sampled slurry, ensure stable flow, and reduce wear on the instrument probe.
Description
Technical Field
The utility model belongs to the technical field of flue gas treatment, and particularly relates to a PH and density detection system for a wet desulfurization process.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the wet desulfurization technology stands out from the unique advantages of the wet desulfurization technology, the wet desulfurization technology has fast and sufficient reaction speed through countercurrent contact of gas and liquid, and the utilization rate of desulfurization additives is high, for example, when lime is used as a desulfurizing agent, the desulfurization efficiency of more than 90 percent can be achieved when Ca/S=1, and the wet desulfurization technology is suitable for flue gas generated by burning high-sulfur coal. Through years of development, the production operation is safe and reliable, rich design, manufacturing, installation, operation and maintenance experience is accumulated, the method is suitable for various-scale power plants and industrial boilers, particularly large-scale power plants, and the produced byproduct gypsum can be used in industries of building materials, cement and the like and has certain economic value.
PH and density are used as key parameters of the process, relate to the reaction efficiency of gas-liquid two-phase contact in the tower, relate to the final waste gas removal effect, and the density is used as a key index of the solid content of slurry in the tower to determine the selection of the dehydration time of gypsum discharge. In the traditional wet desulfurization system, PH and density are arranged on the periphery of a tower body, PH is often realized in a mode of automatically flowing through a wall plate perforated flange external pipeline, density is detected on line in a mode of static pressure in the tower, the design scheme brings a plurality of problems that firstly, PH is automatically blocked after the liquid density in the tower is gradually increased in a mode of static pressure full flow of slurry, and a large amount of manual cleaning workload is brought after discharging and solidifying, water balance in the tower is also influenced, secondly, a sampling port is blocked due to the increase of the liquid density in the tower due to the fact that a differential pressure density interface is arranged on the periphery of the tower, meanwhile, a large amount of air is accumulated at a pressure instrument diaphragm due to severe disturbance of oxidized wind and slurry in the tower, the diaphragm and the slurry are isolated by air, normal detection is difficult to realize, thirdly, all the operations are manual operation, abnormal working conditions are difficult to be found in time, cleaning treatment operation is frequent, and continuous labor workload is large.
Disclosure of utility model
The utility model aims to provide a PH and density detection system for a wet desulfurization process, which can avoid pipeline blockage caused by a static pressure self-flowing mode by a positive pressure sampling mode, and can realize automatic control of the whole detection system by matching with a DCS control system.
In order to achieve the above object, the present utility model is realized by the following technical scheme:
In a first aspect, an embodiment of the utility model provides a wet desulfurization process PH and density detection system, which comprises a plurality of sampling branch pipes, sampling main pipes and detection tanks, wherein the number of the sampling branch pipes corresponds to that of circulating pumps on a desulfurization tower, one end of each sampling branch pipe is connected with an outlet of the circulating pump, the other end of each sampling branch pipe is connected with the sampling main pipe, the sampling main pipe is connected with a slurry inlet at the bottom of the detection tank, a PH meter interface, a differential pressure densimeter interface and an overflow port are arranged on the detection tank, and the overflow port is connected with the desulfurization tower through a pipeline.
As a further technical scheme, each sampling branch pipe is provided with an electric regulating valve.
As a further technical scheme, the head end of the sampling main pipe is connected with a flushing pipeline through a flushing electric valve, and the tail end of the sampling main pipe is connected with a slurry inlet at the bottom of the detection tank.
As a further technical scheme, PH meter interface is located the top of detecting jar, and PH meter interface is provided with two, every PH meter interface all installs the PH meter.
As a further technical scheme, the height of the detection probe of the PH meter extending into the detection tank is lower than the height of the overflow port.
As a further technical scheme, the differential pressure densimeter interface is positioned on the side surface of the detection tank and comprises a differential pressure densimeter upper interface and a differential pressure densimeter lower interface which are connected with the differential pressure densimeter.
As a further technical scheme, the upper interface of the differential pressure densimeter and the lower interface of the differential pressure densimeter are respectively connected with a flushing water pipeline, and a valve is arranged on the flushing water pipeline.
As a further technical scheme, the bottom of the detection tank is also provided with an emptying interface and a flushing interface, the emptying interface is connected with a trench through a pipeline for discharging, the flushing interface is connected with a flushing pipeline, and a valve is arranged on the flushing pipeline.
As a further technical scheme, the detection tank is arranged at the site zero meter platform, and in the running process, the detection tank is always in a full-liquid state, and the liquid is always in a flowing state.
As a further technical scheme, the intelligent monitoring system further comprises a DCS automatic control system, and the DCS automatic control system controls valves on the sampling branch pipes, the sampling main pipe and the detection tank.
The beneficial effects of the embodiment of the utility model are as follows:
the utility model can comprehensively collect the slurry at all azimuth positions in the tower in real time by adopting a circulating pump outlet sampling mode, thereby improving the accuracy of PH and density detection data, avoiding pipeline blockage caused by a static pressure self-flowing mode by adopting a positive pressure sampling mode, balancing the flow of each branch sampling pipeline by adopting an electric regulating valve at the head end of a branch pipe, controlling the flow rate of the sampled slurry, ensuring the flow stability and reducing the abrasion of an instrument probe.
The utility model combines environmental protection compliance and operation safety through the design of full closed-loop slurry backflow and intelligent evacuation. Traditional detecting system need to discharge thick liquid outward and clear up, easily causes environmental pollution, and the manual drainage has thick liquid to splash the risk. In the utility model, the overflow port of the detection tank is directly connected with the desulfurization tower, the total amount of the detected slurry returns, the liquid level balance in the tower is maintained, the external pollution discharge and pollution are avoided, the bottom emptying port and the flushing pipeline are designed, and the residual slurry can be guided into a trench or a recovery system through valve control during maintenance, so that the problem of treatment after solidification is avoided.
The utility model can enable the detection device to automatically open the corresponding regulating valve according to the operation condition of the pump by the DCS control linkage system, collect the corresponding slurry value of the pump outlet, can automatically process possible abnormal conditions in time by adopting modes of flushing, alarming and the like through monitoring the value of the DCS control system, maintain the stable operation of the system, and avoid the blockage of a pipeline caused by solid slurry and the deviation of density values caused by oxidized wind and the like by adopting an external detection tank mode.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a schematic diagram of the piping arrangement of the wet desulfurization process PH and density detection system of the present utility model;
fig. 2 is a schematic structural view of the test tank of the present utility model.
The schematic is used only as schematic;
The device comprises a sampling branch pipe 1, an electric regulating valve 2, a sampling main pipe 3, a detection tank 4, a differential pressure densimeter upper interface 401, a differential pressure densimeter lower interface 402, a slurry inlet 403, a slurry inlet 404, an overflow port 5, a flushing electric valve 6 and a PH meter.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
Example 1
In an exemplary embodiment of the utility model, as shown in fig. 1 and 2, a wet desulfurization process PH and density detection system is provided, which comprises a plurality of sampling branch pipes 1, sampling main pipes 3 and detection tanks 4, wherein the number of the sampling branch pipes 1 corresponds to that of circulating pumps on a desulfurization tower, one end of each sampling branch pipe 1 is connected with an outlet of the circulating pump, the other end of each sampling branch pipe is connected with the sampling main pipe 3, the sampling main pipe 3 is connected with a slurry inlet 403 at the bottom of the detection tank 4, a PH meter interface, a differential pressure densimeter interface and an overflow port 404 are arranged on the detection tank 4, and the overflow port 404 is connected with the desulfurization tower through a pipeline.
According to the system, the sampling branch pipe is connected to the outlet of the circulating pump, positive pressure sampling can be achieved, slurry is driven to enter the sampling branch pipe by the aid of high pressure of slurry at the outlet of the circulating pump, and the problem of pipeline blockage caused by poor slurry mobility in a static pressure self-flowing mode is thoroughly avoided. Meanwhile, the external detection tank forms closed loop reflux through the overflow port, so that the slurry is ensured to continuously flow and update, and detection errors caused by standing or uneven distribution of local slurry in the tower are avoided. In addition, the total slurry returns to the design of the desulfurizing tower, so that the balance of the liquid level in the tower is maintained, the discharge treatment is not needed, and the manual cleaning workload is greatly reduced.
In this embodiment, each sampling branch pipe 1 is provided with an electric control valve 2, specifically, as shown in fig. 1, sampling branch pipes 1 are provided with four, each sampling branch pipe is provided with an electric control valve, and dynamic adjustment and control of opening of each valve by using a DCS control system are realized to balance multi-branch flow. The numerical value of the opening degree can be set to 0-100% when in use, and is specifically and comprehensively set by considering the fluidity of slurry, the balance of the flow of the multi-way sampling branch pipe and the abrasion of the instrument probe, and a smaller opening degree advanced test (such as 10%) is generally selected initially and set by a DCS control system. The DCS program is designed with interlocking logic of the regulating valve group and the pump operation signals, namely, the opening of the valve group is in linkage with the operation of the corresponding pump, and only the pump in the operation state can automatically open the sampling regulating valve group of the outlet pipeline of the pump, and meanwhile, the shutdown signals of the pump synchronously act the regulating valve to execute the closing operation. The slurry is guaranteed not to flow back into the pump in a stop state, errors caused by manual operation are reduced, and labor workload is reduced.
In this embodiment, the head end of the sampling manifold 3 is connected to a flushing pipeline through a flushing motor valve 5, and the tail end of the sampling manifold 3 is connected to a slurry inlet 403 at the bottom of the detection tank 4. The characteristics of high solid content, poor fluidity and easy precipitation of the slurry are considered, and the slurry is arranged for ensuring the continuous fluidity of the slurry and treating possible abnormal conditions. Under normal conditions, the flushing electric valve is in a closed state, if DCS remote data are stopped for a long time (the numerical value of normal working conditions can continuously fluctuate slightly), the system judges that the system is blocked, issues a command and opens a flushing valve group to flush and dredge a pipeline, and provides an alarm for operators to check. At the same time, if the system is shut down, the valve is also opened briefly to clean the pipeline.
Through automatic flushing design, when the system is stopped or data is detected to be abnormal (such as PH/density value continuously for 5 minutes without fluctuation), the DCS system automatically starts a flushing electric valve, and high-pressure flushing water is utilized to forcefully flush the sampling main pipe and the branch pipe, so that sediment is quickly removed, and the pipeline is recovered to be smooth. The design not only reduces manual intervention, but also can complete maintenance in a non-stop state, and remarkably improves the continuous operation capability of the system. In addition, the flushing logic is linked with the detection data, so that the intelligent operation and maintenance of abnormality processing is realized, the detection data lag or failure caused by blockage is avoided, and the reliability of process control is ensured.
In this embodiment, the PH meter interfaces are located at the top of the detection tank 4, and two PH meter interfaces are provided, and each PH meter interface is provided with a PH meter 6, and further, the height of the detection probe of the PH meter extending into the detection tank 4 is lower than the height of the overflow port. Traditional single PH meter detection is easy to cause data distortion due to probe faults or slurry local PH non-uniformity. The double PH meter is adopted, the measurement accuracy can be checked in real time by comparing the data of the two probes, meanwhile, the double probes are arranged at different positions of the tank top, the PH values of different areas of the slurry in the tank can be covered, the detection deviation caused by slurry layering or flowing dead angles is eliminated, and the data is ensured to represent the whole working condition. By limiting the extending height of the probe below the overflow port, the probe is ensured to be immersed in flowing slurry all the time, and measurement failure caused by bubble attachment or liquid level drop is avoided. Meanwhile, due to the design of the overflow port, the slurry in the tank forms a stable liquid level, the slurry flow rate at the position of the probe is moderate, so that the mechanical impact of turbulence on the probe is reduced, the sediment interference in a standing area is avoided, and the stability and the accuracy of PH value detection are obviously improved.
In this embodiment, the differential pressure densitometer interface is located on the side of the test tank, and includes an upper differential pressure densitometer interface 401 and a lower differential pressure densitometer interface 402 that are connected to the differential pressure densitometer. The differential pressure densitometer interface is arranged on the side surface of the detection tank, and the slurry density is directly calculated by using the formula p=pgh through an upper interface and a lower interface with a fixed height difference (such as 1 meter). The external detection tank avoids the standing precipitation of the slurry, and the slurry in individual areas in the tower has poor disturbance, uneven distribution or influence of oxidation wind on detection data, so that the obtained data are real-time and accurate.
Further, the upper interface 401 and the lower interface 402 of the differential pressure densimeter are respectively connected with a flushing water pipeline, a valve is arranged on the flushing water pipeline, and the differential pressure densimeter interface contacts with high-solid-content slurry for a long time, so that the diaphragm is easy to be blocked or damaged due to gypsum crystallization or particle deposition. By configuring independent flushing water pipelines for the upper and lower interfaces, a valve can be opened to flush the interfaces and the diaphragms under high pressure during detection intermittence or system maintenance, attachments are removed, and detection accuracy is recovered. The design is particularly suitable for a desulfurization system which operates for a long time, the service life of the differential pressure densimeter is obviously prolonged, and the replacement frequency is reduced. Meanwhile, the flushing operation can be remotely controlled through the DCS system, the instrument is not required to be manually assembled or disassembled, and the operation and maintenance difficulty and cost are reduced.
In this embodiment, the bottom of detection jar still is provided with evacuation interface and flushing interface, the evacuation interface is discharged through pipeline access trench, flushing interface links to each other with the wash water pipeline, be provided with the valve on the wash pipeline. When the system is shut down for a long time or overhauled, the slurry in the tank can be quickly led into a trench or a recovery system through the bottom emptying interface, so that the slurry is prevented from being difficult to treat after being solidified, and the tank body can be thoroughly cleaned after being emptied through the flushing interface, so that scaling is prevented. The design simplifies the maintenance flow, shortens the downtime and meets the environmental protection requirement. In addition, independent control of the purge and flush valves allows for staged operation, further enhancing flexibility.
In this embodiment, FRP can be selected to the detection jar material, the detection jar is arranged in on-the-spot zero meter platform department, in the operation in-process, be in full liquid state all the time in the detection jar, and liquid is in the flow state all the time. If the detection tank is arranged at a high position, the slurry needs to be additionally pumped, so that the energy consumption is increased, and if the detection tank is arranged at a low position, the flow is possibly stagnated due to insufficient static pressure. Through placing the detection tank on the zero meter platform, the positive pressure at the outlet of the circulating pump is utilized to naturally drive the slurry to flow, no extra power is needed, and the energy conservation and the high efficiency are realized. The flooded state design ensures that no gas-liquid mixing interface exists in the tank, avoids the interference of bubbles on PH and density detection, continuously and slowly overflows to update slurry, prevents solid-containing particles from settling, and ensures the representativeness and timeliness of detection data.
In this embodiment, the system further includes a DCS automatic control system that controls valves on the sampling branch pipes, the sampling header pipe, and the detection tank. The full-automatic control is realized through the DCS system, namely the sampling valve is automatically opened and closed according to the state of the circulating pump, the flow of the branch is dynamically regulated, PH/density data is monitored in real time, and flushing or alarm is triggered. For example, when the flow of a certain branch is abnormal, the DCS can independently adjust the opening of the corresponding valve, so that the whole system is prevented from being stopped. In addition, the data history record and the trend analysis function provide basis for process optimization, and the power assisting realizes the maximization of desulfurization efficiency. The design reduces the manual intervention to the minimum, improves the intelligent level of the system, and reduces the operation and maintenance cost.
In this embodiment, the PH meter, differential pressure densimeter, and DCS automatic control system that are used all adopt existing structures.
The working principle of the wet desulfurization process PH and density detection system provided by the embodiment is as follows:
The sampling branch pipe is connected with the outlet of each circulating pump, each branch sampling pipe is summarized to the main pipe after passing through an independent electric regulating valve, the head end of the main pipe is provided with a flushing water electric valve, the tail section of the main pipe is connected to a newly-added detection tank, the top end of the detection tank body is provided with a PH meter interface, the side face of the detection tank body is provided with a differential pressure density interface, the bottom of the detection tank body is provided with an evacuation and flushing interface, and slurry after overflow returns to the tower through an outlet pipeline.
The lateral surface of the circulating pump outlet pipeline is reserved with a branch pipe joint flange, and the pipeline is sampled to reduce hidden trouble of self-flow blockage by means of positive pressure of slurry at the outlet of the circulating pump. The electric regulating valve is arranged at the interface of each sampling branch pipe and the outlet pipeline, so that the sampling flow of each sampling pipeline can be balanced, and meanwhile, on the DCS program design, the valve actuator is interlocked with the start and stop of the corresponding circulating pump, the control system can automatically open the corresponding valve according to the operation instruction of the pump, the pump which is not in the operation state corresponds to the sampling regulating valve and keeps the closing state, and the opening of the valve is regulated manually and optionally so as to regulate the flow.
The system is characterized in that a process water flushing electric valve is arranged at the head end of a sampling main pipe, after the system is stopped, a DCS automatic control system sends out an instruction to execute flushing operation for a certain time, meanwhile, if PH or density values are kept unchanged for a certain time (such as 5 min) in the running state of the system, the control system judges that abnormality exists, flushing is automatically started for a period of time, if normal fluctuation is restored, the valve is closed, otherwise, an alarm is given, and an operator is informed of checking;
The tail end of the sampling main pipe is connected with a newly added on-line detection tank, and the slurry adopts a mode of overflowing from bottom to top to fill the tank. The differential pressure instrument arranged on the tank wall can measure the pressure difference of the slurry at a set height, the density is obtained after the differential pressure instrument is converted by the DCS system, corresponding data is measured after the PH meter probe on the tank top contacts the slurry, and the data are synchronously uploaded to the DCS system for operators to check. The emptying and manual flushing of the tank body can be manually operated when the equipment is out of service. The flow rate of the slurry is limited by the opening condition of the electric regulating valve of each branch pipe, but the possibility of the whole system being blocked is greatly reduced due to the positive pressure of the pump outlet.
Through the PH and density detection system of the wet desulfurization process, in some newly-built and modified projects, the stability and efficiency of the desulfurization system are guaranteed, the accuracy and instantaneity of instrument data are improved, the manual workload is reduced, the investment cost caused by modification of other schemes is reduced, and the method is an extremely economical process measure.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The PH and density detection system for the wet desulfurization process is characterized by comprising a plurality of sampling branch pipes, sampling main pipes and detection tanks, wherein the number of the sampling branch pipes corresponds to that of circulating pumps on a desulfurization tower, one end of each sampling branch pipe is connected with an outlet of the circulating pump, the other end of each sampling branch pipe is connected with the sampling main pipe, the sampling main pipe is connected with a slurry inlet at the bottom of the detection tank, a PH meter interface, a differential pressure densimeter interface and an overflow port are arranged on the detection tank, and the overflow port is connected with the desulfurization tower through a pipeline.
2. The wet desulfurization process PH and density detection system according to claim 1, wherein each of the sampling branch pipes is provided with an electric control valve.
3. The wet desulfurization process PH and density detection system according to claim 1, wherein a head end of the sampling manifold is connected to the flushing line via a flushing motor valve, and a tail end of the sampling manifold is connected to a slurry inlet at a bottom of the detection tank.
4. The wet desulfurization process PH and density detection system according to claim 1, wherein the PH meter interfaces are located at the top of the detection tank, and two PH meter interfaces are provided, each PH meter interface being provided with a PH meter.
5. The wet desulfurization process PH and density measurement system according to claim 4, wherein the measurement probe of the PH meter extends into the measurement tank to a height lower than that of the overflow port.
6. The wet desulfurization process PH and density measurement system according to claim 1, wherein the differential pressure densitometer interface is located on a side of the measurement tank and comprises an upper differential pressure densitometer interface and a lower differential pressure densitometer interface connected to the differential pressure densitometer.
7. The wet desulfurization process PH and density detection system according to claim 6, wherein the differential pressure densitometer upper interface and the differential pressure densitometer lower interface are respectively connected with a flushing water pipe, and the flushing water pipe is provided with a valve.
8. The wet desulfurization process PH and density detection system according to claim 1, wherein the bottom of the detection tank is further provided with an evacuation port and a flushing port, the evacuation port is connected to a trench through a pipeline for drainage, the flushing port is connected to a flushing pipeline, and a valve is provided on the flushing pipeline.
9. The wet desulfurization process PH and density detection system according to claim 1, wherein the detection tank is disposed at a zero meter platform in the field, and wherein the detection tank is always in a liquid-full state and the liquid is always in a flowing state during operation.
10. The wet desulfurization process PH and density detection system of claim 1, further comprising a DCS automatic control system that controls valves on the sampling manifold, and detection tank.
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