Desulfurization slurry monitoring system, control method, desulfurization system and thermal generator set

Abstract

The invention provides a desulfurization slurry monitoring system, a control method, a desulfurization system and a thermal generator set, and belongs to the technical field of desulfurization. The system comprises a separation mechanism, a slurry inlet of the separation mechanism is connected with a slurry outlet of a desulfurization absorption tower, the separation mechanism is used for separating desulfurization slurry into a first mixed solution and a second mixed solution, and the solid content and size of the first mixed solution are both larger than those of the second mixed solution; a first outlet of the separation mechanism is used for discharging a first mixed solution outwards, a second outlet of the separation mechanism is connected with a mixed solution inlet of the buffer tank, and a second mixed solution is conveyed into the buffer tank through the second outlet; a liquid outlet of the buffer tank is used for discharging the second mixed liquid outwards, a detection mechanism is arranged on the buffer tank, and the detection mechanism is used for measuring the acid-base value of the second mixed liquid as the acid-base value of the desulfurization slurry. The structure is simple, the service life of the detection mechanism can be effectively prolonged, and the acid-base value measurement precision can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of desulfurization, and in particular to a desulfurization slurry monitoring system, a control method for the desulfurization slurry monitoring system, a desulfurization system and a thermal power generating set. Background Art

[0002] In the wet limestone-gypsum flue gas desulfurization system of power plants, pH value is an extremely important technical parameter as a measure of the pH value of the absorption tower slurry. The limestone utilization rate, desulfurization efficiency and gypsum slurry quality are closely related to the control of pH value. Therefore, in the operation of the desulfurization system, the continuity and reliability of pH value indicator monitoring must be guaranteed. To ensure the continuity and reliability of the monitoring indicators, the installation and monitoring methods of pH play a vital role. The general on-site installation methods of industrial online pH meters are mainly the following: submerged installation, flow installation, pipeline installation, top insertion installation and side wall insertion installation. However, due to the particularity of the absorption tower structure and the limitations of the use conditions, the side wall insertion and top insertion installation methods cannot be used for thermal power plant desulfurization. For the insertion installation method at the production site, due to the easy deposition of the slurry in the desulfurization system, the pH electrode is easily buried by the solids in the slurry, resulting in distortion of the pH monitoring value, which not only affects the operation of the system, but also the electrode is easily damaged by being wrapped by solids for a long time; there is also a pipeline installation method on site, that is, installing an overflow pH meter on the outlet pipe of the gypsum discharge pump, but the desulfurization slurry at the outlet of the gypsum discharge pump has a high solid content (about 30%). In order to prevent the slurry from depositing, the slurry flow rate in the pipe is generally controlled at 2-4m / s. The pH electrode will be accelerated in the pipeline and the pH will be frequently damaged. If the slurry flow rate at the outlet of the gypsum discharge pump is controlled by throttling or other methods, the outlet pipe of the gypsum discharge pump will be blocked due to the low flow rate. At the same time, the pH electrode will be wrapped by solids, which will also cause distortion of the measured data and damage to the pH electrode. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a desulfurization slurry monitoring system, a control method, a desulfurization system and a thermal power generator set, so as to solve the problem that the pH electrode is easily buried by the solids in the slurry during the above-mentioned measurement, resulting in distortion of the pH monitoring value and affecting the operation of the system. The electrode is also easily damaged when it is wrapped by the solids for a long time.

[0004] In order to achieve the above object, an embodiment of the present invention provides a desulfurization slurry monitoring system, the system comprising:

[0005] A separation mechanism, wherein the slurry inlet of the separation mechanism is connected to the slurry outlet of the desulfurization absorption tower, and is used to separate the desulfurization slurry into a first mixed liquid and a second mixed liquid, the solid content and size in the first mixed liquid are greater than the solid content and size in the second mixed liquid, the first outlet of the separation mechanism is used to discharge the first mixed liquid to the outside, and the second outlet of the separation mechanism is connected to the mixed liquid inlet of the buffer tank, and the second mixed liquid is transported to the buffer tank through the second outlet;

[0006] A buffer box, the liquid outlet of the buffer box is used to discharge the second mixed liquid to the outside, and a detection mechanism is provided on the buffer box, and the detection mechanism is used to measure the pH value of the second mixed liquid and use it as the pH value of the desulfurization slurry.

[0007] Optionally, the separation mechanism is a hydrocyclone.

[0008] Optionally, a first valve is provided between the slurry inlet of the separation mechanism and the slurry outlet of the desulfurization absorption tower;

[0009] A second valve is provided between the second outlet of the separation mechanism and the mixed liquid inlet of the buffer tank.

[0010] Optionally, the buffer box includes:

[0011] A containing box with a hollow interior and a through-hole, the containing box being provided with a mounting cover, the detecting mechanism being provided on the mounting cover;

[0012] The conical portion with a hollow interior is arranged at the bottom of the containing box.

[0013] Optionally, a liquid outlet is provided on the holding box as the liquid outlet of the buffer box;

[0014] The small end of the tapered portion serves as a mixed liquid inlet of the buffer tank and is connected to the second outlet of the separation mechanism.

[0015] Optionally, the liquid outlet of the buffer tank is higher than the detection port of the detection mechanism in the vertical direction.

[0016] Optionally, the diameter of the mixed liquid inlet of the buffer tank is smaller than the diameter of the liquid outlet of the buffer tank.

[0017] In a second aspect, an embodiment of the present invention further provides a control method for a desulfurization slurry monitoring system, which is applied to the above-mentioned desulfurization slurry monitoring system, and the method comprises:

[0018] Determine that the system starts running instructions, control the separation mechanism to start inputting the desulfurized slurry, and then control the separation mechanism to start conveying the second mixed liquid to the buffer tank;

[0019] It is determined that a system stop operation instruction is received, the separation mechanism is controlled to stop conveying the second mixed liquid to the buffer tank, and then the separation mechanism is controlled to stop inputting the desulfurization slurry.

[0020] In a third aspect, an embodiment of the present invention further provides a desulfurization system, comprising the above-mentioned desulfurization slurry monitoring system.

[0021] In a fourth aspect, an embodiment of the present invention further provides a thermal power generating set, comprising the above-mentioned desulfurization system.

[0022] The technical solution separates the desulfurization slurry into a first mixed liquid and a second mixed liquid through a separation mechanism, and transports the second mixed liquid to a buffer tank. The pH value of the second mixed liquid is measured by a detection mechanism arranged on the buffer tank as the pH value of the desulfurization slurry. The overall structure is simple, and it can effectively reduce the erosion of the precipitated solids in the desulfurization slurry on the detection mechanism, reduce the wear of the detection mechanism, increase the service life, and reduce maintenance; and it can effectively reduce the measurement distortion of the detection mechanism, and the pH value measurement accuracy is high.

[0023] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the desulfurization slurry monitoring system provided by the present invention;

[0026] Figure 2 It is a structural schematic diagram of the buffer box provided by the present invention;

[0027] Figure 3 It is a schematic diagram of the installation of a pH meter in the prior art provided by the present invention;

[0028] Figure 4 It is a structural schematic diagram of the desulfurization slurry monitoring system in the prior art provided by the present invention.

[0029] Description of Reference Numerals

[0030] 1-separation mechanism; 101-first valve; 102-second valve;

[0031] 2-desulfurization absorption tower; 3-buffer tank; 31-holding box;

[0032] 32-installation cover; 33-conical portion; 4-detection mechanism. DETAILED DESCRIPTION

[0033] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0034] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the inventive product is usually placed when in use.

[0035] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0036] The terms "parallel", "vertical", etc. do not mean that the components must be absolutely parallel or vertical, but can be slightly tilted. For example, "parallel" only means that its direction is more parallel than "vertical", and does not mean that the structure must be completely parallel, but can be slightly tilted.

[0037] The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Figure 1 It is a structural schematic diagram of the desulfurization slurry monitoring system provided by the present invention; Figure 2 It is a structural schematic diagram of the buffer box provided by the present invention; Figure 3It is a schematic diagram of the installation of a pH meter in the prior art provided by the present invention; Figure 4 It is a structural schematic diagram of the desulfurization slurry monitoring system in the prior art provided by the present invention.

[0041] In order to realize the continuous and reliable monitoring of pH value of desulfurization system in thermal power plant and ensure the safe, reliable and economical operation of desulfurization system, there are several existing pH meter installation and monitoring methods:

[0042] 1. Pipeline installation method:

[0043] A hole is opened at the lower part of the absorption tower wall, and a DN50 slurry outlet pipe is installed at the hole. A tee is opened on the outlet pipe to install a pH meter. The slurry in the outlet pipe is finally discharged into the ditch and then into the absorption tower pit.

[0044] A pH meter is installed on the outlet pipe of the gypsum discharge pump. In order to keep the pH meter in continuous operation, when the dehydration system is shut down, the slurry at the outlet of the gypsum discharge pump is circulated and pumped into the absorption tower.

[0045] 2. Submerged installation method:

[0046] The drainage pipe installed after the hole is opened in the absorption tower wall leads the slurry into the ditch. The slurry in the ditch maintains a certain liquid level. The pH meter is installed in the ditch of the absorption tower. In order to prevent the slurry in the ditch from depositing, a flushing water pipeline is installed next to the pH electrode, which can be used for regular or cyclic flushing of the pH electrode.

[0047] Flow-through installation:

[0048] A hole is opened at the lower part of the absorption tower wall, and a slurry outlet pipe is installed at the hole. The slurry enters the buffer tank from the lower part of the outlet pipe and flows out from the upper part. The rear end of the outlet pipe is connected to a flow density meter. The slurry in the outlet pipe is finally discharged into the ditch and then merged into the absorption tower pit. In order to prevent the slurry from depositing during expansion, a backwash water pipe is installed on the outlet pipe, which can flush the buffer tank regularly or cyclically.

[0049] However, the above three installation methods still have the following problems:

[0050] 1. Pipeline installation method:

[0051] Gypsum discharge pump outlet pipeline installation: Due to the high solid content of the absorption tower slurry (the solid content of the monitored slurry is about 30%), and the particle size of the solids in the slurry is basically 20-150μm, in order to prevent the slurry from depositing in the pipeline, the slurry flow rate in the outlet pipe of the gypsum discharge pump is generally controlled at 2-4m / s. Under this operating condition, the pH electrode will be damaged rapidly due to the continuous friction of the solid particles in the slurry, and the service life of the pH meter will be greatly reduced. In addition, because this method is to install the pH meter on the outlet pipe section of the gypsum discharge pump, when the dehydrator is shut down, because of the need for desulfurization pH monitoring in the thermal power plant, the gypsum discharge pump still needs to pump the absorption tower slurry into the absorption tower through reflux for circulation. This method is also gradually replaced by the flow-through and submerged monitoring methods due to the need for energy saving and consumption reduction.

[0052] Installation with a hole in the lower part of the absorption tower wall: In this way, the pH meter is installed on the DN50 slurry outlet pipe at the lower part of the absorption tower. The operating liquid level of the absorption tower is generally around 10-14m (related to factors such as unit capacity and coal sulfur content). A three-way connection is opened on the outlet pipe to install the pH meter (pH probe is installed according to Figure 1 The slurry is discharged into the ditch and then into the absorption tower pit. The on-site monitoring slurry flow rate of this installation method is 3-5m / s, and there is also the problem of accelerated wear of the pH probe.

[0053] 2. Submerged installation method:

[0054] The submerged installation method is to drain from the lower wall of the absorption tower to the ditch. The pH meter is installed in the ditch of the absorption tower. The slurry in the ditch maintains a certain liquid level. In order to prevent the slurry in the ditch from settling, a flushing water pipeline is installed next to the pH electrode to flush the pH electrode regularly. The disadvantage of this method is that the slurry with a concentration of about 30% that is drained from the absorption tower to the ditch is easily deposited in the ditch due to its slow flow rate. The pH probe is easily wrapped by solids, which not only distorts the data but also easily damages the pH. It is rarely used in the desulfurization system of thermal power plants.

[0055] 3. Flow-through installation:

[0056] In order to solve the problem of pH meter probe wear in the pipe installation method with holes on the lower wall of the absorption tower, the desulfurization pH meter in thermal power plants is generally installed in a flow-through manner. However, due to the high solid content of the slurry in the absorption tower, this method will also cause slurry deposition. Therefore, the site generally adopts a flushing method every 2 hours to ensure the normal use environment of pH (such as Figure 4: The flushing operation method is as follows: When the monitoring system is running, except for the fully closed state of the manual door at the bottom of the pH box, the other manual doors are in the fully open state. During flushing, turn off the electric valve II and open the electric valve I to flush the pH and density meter. After flushing, turn off the electric valve I and open the electric valve II to resume operation of the system). In this way, the pH cannot be continuously monitored online during flushing. At the same time, due to the dilution effect of the residual flushing water in the flushed box, there is a period where the monitoring data does not match the actual monitored slurry, resulting in a short monitoring blind spot and a certain distortion interval in the desulfurization system. At the same time, since the lower part of the pH is a planar structure, there is an incomplete automatic flushing, and the slurry will also be deposited around the bottom of the pH box, and the accumulated slurry needs to be cleaned up regularly. In addition, although the slurry flow rate is reduced by the pH box, the 30% concentration of solid slurry will still cause wear on the pH probe when it flows through the pH probe.

[0057] The common disadvantage of the above three installation methods is that when the desulfurization system of the thermal power plant is shut down, the pH probe needs special maintenance to prevent the pH probe from being exposed to the air for a long time.

[0058] Therefore, this embodiment provides a desulfurization slurry monitoring system, such as Figure 1 As shown, the system comprises:

[0059] A separation mechanism 1, wherein the slurry inlet of the separation mechanism 1 is connected to the slurry outlet of the desulfurization absorption tower 2, and is used to separate the desulfurization slurry into a first mixed liquid and a second mixed liquid, wherein the solid content and size of the first mixed liquid are greater than the solid content and size of the second mixed liquid, and the first outlet of the separation mechanism 1 is used to discharge the first mixed liquid to the outside, and the second outlet of the separation mechanism 1 is connected to the mixed liquid inlet of the buffer tank 3, and the second mixed liquid is transported to the buffer tank 3 through the second outlet;

[0060] The buffer box 3 has a liquid outlet for discharging the second mixed liquid. The buffer box 3 is provided with a detection mechanism 4 for measuring the pH value of the second mixed liquid as the pH value of the desulfurization slurry.

[0061] Specifically, in this embodiment, after the desulfurization liquid is mixed with the flue gas in the desulfurization absorption tower 2, it reacts with sulfur element to form a desulfurization slurry containing solids, and is transported to the separation mechanism 1 through the slurry outlet of the desulfurization absorption tower 2. Since the content of solid matter (gypsum: CaSO4.2H2O) in the desulfurization slurry is relatively high, when the detection mechanism 4 is measured, the friction and scouring of the solid matter will cause damage to the detection mechanism 4, and the accumulation of solid matter will cause measurement distortion of the detection mechanism 4. Therefore, the separation mechanism 1 is set to separate the desulfurization slurry into a first mixed liquid and a second mixed liquid. The solid content and size in the first mixed liquid are greater than the solid content and size in the second mixed liquid, and the first mixed liquid is discharged to a pit or a ditch, and the second mixed liquid is transported to the buffer tank 3 for pH measurement as the pH value of the desulfurization slurry. After the measurement is completed, it is discharged to the pit or the ditch through the liquid outlet. The detection mechanism 4 uses a pH meter.

[0062] In order to avoid the corrosion of the desulfurization slurry to the buffer box 3, the material of the buffer box 3 can be PP material or 2205, 2507, 316L and other stainless steel materials that can withstand corrosion performance below 20000mg / L[cl-] concentration, or the part contacting the slurry can be made of carbon steel lining rubber.

[0063] More specifically, in order to ensure the effect of reducing the flow rate of the buffer tank 3, the diameter D of the buffer tank 3 is larger than the diameter of the second mixed liquid, and the ratio is preferably times.

[0064] Furthermore, the separation mechanism 1 is a hydrocyclone.

[0065] Specifically, in this embodiment, the hydrocyclone uses an ultrafine hydrocyclone with a small diameter and a small cone angle, the inlet pressure is 0.1-0.15 MPa, the overflow separation particle size is less than 10 μm, and the solid content is less than 5% (i.e., the second outlet of the separation mechanism 1). The bottom flow of the hydrocyclone (i.e., the first outlet of the separation mechanism 1) is set just above the trench or the trench near the absorption tower, and the bottom flow after cyclone (the first mixed liquid) is directly discharged into the trench near the absorption tower.

[0066] To ensure the long-term safe and reliable operation of the system, the hydrocyclone bracket, pipe clamp, bolts, flange and other accessories are all made of stainless steel materials such as 2205, 2507, 316L, etc. that can withstand [cl-] corrosion performance below 20000mg / L. Other accessories such as ultra-fine hydrocyclones can be made of polyamine or carbon steel rubber lining to meet the environmental corrosion protection requirements of the desulfurization system of thermal power plants.

[0067] Furthermore, a first valve 101 is provided between the slurry inlet of the separation mechanism 1 and the slurry outlet of the desulfurization absorption tower 2;

[0068] A second valve 102 is provided between the second outlet of the separation mechanism 1 and the mixed liquid inlet of the buffer tank 3 .

[0069] Specifically, in this embodiment, the slurry inlet of the separation mechanism 1 is connected to the slurry outlet of the desulfurization absorption tower 2 through a pipeline, and a first valve 101 is provided on the pipeline; the second outlet of the separation mechanism 1 is connected to the mixed liquid inlet of the buffer tank 3 through a pipeline, and a second valve 102 is provided on the pipeline, so that the flow rate can be controlled by opening and closing the pipeline, and the pipeline on-off control can be achieved. In addition, since the optimal value of the inlet pressure of different separation mechanisms 1 is different, the inlet pressure is adjusted by the first valve 101 provided.

[0070] Furthermore, the buffer box 3 comprises:

[0071] A receiving box 31 with a hollow interior and a through-hole, wherein a mounting cover plate 32 is disposed on the receiving box 31, and the detection mechanism 4 is disposed on the mounting cover plate 32;

[0072] A conical portion 33 with a hollow interior is provided at the bottom of the receiving box 31 .

[0073] Specifically, in this embodiment, the buffer box 3 is configured to include a containing box 31 and a tapered portion 33, which can be manufactured in an integrated manner or can be manufactured separately and then welded. The detection mechanism 4 can be fixed by flanges, bolts or other fixing methods.

[0074] More specifically, the receiving box 31 can be set to be cylindrical, and the corresponding tapered portion 33 can be set to be conical; the receiving box 31 can also be set to be square, and the corresponding tapered portion 33 can be set to be square cone, and the cone angle φ≤60.

[0075] Furthermore, the containing box 31 is provided with a liquid outlet as the liquid outlet of the buffer box 3;

[0076] The small end of the tapered portion 33 serves as the mixed liquid inlet of the buffer tank 3 and is connected to the second outlet of the separation mechanism 1 .

[0077] Specifically, in this embodiment, a liquid outlet is opened at the top of the containing box 31 as the liquid outlet of the buffer box 3, and the small end of the tapered portion 33 is used as the mixed liquid inlet of the buffer box 3. Therefore, the liquid outlet and the mixed liquid inlet of the buffer box 3 have a certain distance, and the liquid outlet of the buffer box 3 is located above the mixed liquid inlet. When the second mixed liquid enters from the small end of the tapered portion 33, the liquid level can effectively rise slowly, and the flow rate of the second mixed liquid can be effectively slowed down, thereby reducing the scouring of the detection mechanism 4.

[0078] In addition, since a certain amount of solid matter with a smaller diameter is still mixed in the second mixed liquid, it will settle at the bottom, and the small end of the conical portion 33 is used as the mixed liquid inlet of the buffer tank 3. When the second mixed liquid enters from the small end of the conical portion 33, it can flush the solid precipitates to avoid the accumulation of solid precipitates at the bottom of the buffer tank 3. There is no need to flush the detection mechanism 4 regularly, thereby ensuring continuous monitoring of the pH value of the desulfurization system of the thermal power plant.

[0079] Furthermore, the liquid outlet of the buffer tank 3 is higher than the detection port of the detection mechanism 4 in the vertical direction.

[0080] Specifically, in this embodiment, the liquid outlet of the buffer box 3 is arranged to be higher than the detection port of the detection mechanism 4 in the vertical direction. Therefore, when the second mixed liquid is discharged outward through the liquid outlet of the buffer box 3, the detection port of the detection mechanism 4 has been immersed in the second mixed liquid. Therefore, during normal operation, as long as the separation mechanism 1 is in a normal operating state, the detection port of the detection mechanism 4 is always located in the second mixed liquid, thereby protecting the detection mechanism 4 and increasing the service life of the detection mechanism 4.

[0081] More specifically, the detection mechanism 4 adopts a pH meter, and the lower edge of the inner diameter of the liquid outlet of the buffer box 3 is higher than the detection probe (port) of the pH meter by more than 30 mm to ensure that the pH probe can be immersed in the second mixed liquid all the time.

[0082] Furthermore, the diameter of the mixed liquid inlet of the buffer tank 3 is smaller than the diameter of the liquid outlet of the buffer tank 3 .

[0083] Specifically, in this embodiment, this configuration can eliminate the siphoning phenomenon that may occur during system operation, thereby protecting the equipment.

[0084] This embodiment provides a control method for a desulfurization slurry monitoring system, which is applied to the above-mentioned desulfurization slurry monitoring system. The method includes:

[0085] Determine that the system starts running instructions, control the separation mechanism to start inputting the desulfurized slurry, and then control the separation mechanism to start conveying the second mixed liquid to the buffer tank;

[0086] It is determined that a system stop operation instruction is received, the separation mechanism is controlled to stop conveying the second mixed liquid to the buffer tank, and then the separation mechanism is controlled to stop inputting the desulfurization slurry.

[0087] Specifically, in this embodiment, when the system stops running, in order to ensure that the detection port of the detection mechanism is always located in the second mixed liquid, after receiving the system stop operation instruction, in order to prevent the second mixed liquid in the buffer tank from flowing back into the separation mechanism, the separation mechanism is first controlled to stop conveying the second mixed liquid to the buffer tank, and then the separation mechanism is controlled to stop inputting the desulfurization slurry, thereby protecting the detection mechanism and increasing the service life of the detection mechanism.

[0088] Specifically, in this embodiment, when the system stops and starts, in order to prevent the second mixed liquid in the buffer tank from flowing back into the separation mechanism, after receiving the system start operation instruction, the separation mechanism is first controlled to start inputting desulfurization slurry to separate the desulfurization slurry into a first mixed liquid and a second mixed liquid, and then the separation mechanism is controlled to start conveying the second mixed liquid to the buffer tank.

[0089] In another embodiment, controlling the separation mechanism to stop delivering the second mixed liquid to the buffer tank and then controlling the separation mechanism to stop inputting the desulfurization slurry can be replaced by controlling the second valve to close and then controlling the first valve to close.

[0090] In another embodiment, controlling the separation mechanism to start inputting the desulfurized slurry and then controlling the separation mechanism to start delivering the second mixed liquid to the buffer tank can be replaced by controlling the first valve to open and then controlling the second valve to open.

[0091] This embodiment provides a desulfurization system, including the above-mentioned desulfurization slurry monitoring system.

[0092] Specifically, in this embodiment, the remaining structure of the desulfurization system is the prior art known to those skilled in the art and will not be described in detail here.

[0093] This embodiment provides a thermal power generating set, including the above-mentioned desulfurization system.

[0094] Specifically, in this embodiment, the remaining structure of the thermal power generating set is the prior art known to those skilled in the art and will not be described in detail here.

[0095] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0096] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiments can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor (processor) perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0097] The optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, the technical scheme of the embodiments of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner when there is no contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0098] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A desulfurization slurry monitoring system, It is characterized in that The system comprises: A separation mechanism (1), wherein the slurry inlet of the separation mechanism (1) is connected to the slurry outlet of the desulfurization absorption tower (2), and is used to separate the desulfurization slurry into a first mixed liquid and a second mixed liquid, the solid content and size of the first mixed liquid are greater than the solid content and size of the second mixed liquid, the first outlet of the separation mechanism (1) is used to discharge the first mixed liquid to the outside, the second outlet of the separation mechanism (1) is connected to the mixed liquid inlet of the buffer tank (3), and the second mixed liquid is transported to the buffer tank (3) through the second outlet; A buffer box (3), wherein the liquid outlet of the buffer box (3) is used to discharge the second mixed liquid to the outside, and the buffer box (3) is provided with a detection mechanism (4), and the detection mechanism (4) is used to measure the pH value of the second mixed liquid and use it as the pH value of the desulfurization slurry.

2. The desulfurization slurry monitoring system according to claim 1, It is characterized in that The separation mechanism (1) is a hydrocyclone.

3. The desulfurization slurry monitoring system according to claim 1, It is characterized in that A first valve (101) is provided between the slurry inlet of the separation mechanism (1) and the slurry outlet of the desulfurization absorption tower (2); A second valve (102) is provided between the second outlet of the separation mechanism (1) and the mixed liquid inlet of the buffer tank (3).

4. The desulfurization slurry monitoring system according to claim 1, It is characterized in that The buffer box (3) comprises: A containing box (31) with a hollow interior and a through hole, wherein a mounting cover plate (32) is provided on the containing box (31), and the detection mechanism (4) is provided on the mounting cover plate (32); A conical portion (33) with a hollow interior is arranged at the bottom of the containing box (31).

5. The desulfurization slurry monitoring system according to claim 4, It is characterized in that The containing box (31) is provided with a liquid outlet serving as the liquid outlet of the buffer box (3); The small end of the tapered portion (33) serves as the mixed liquid inlet of the buffer tank (3) and is connected to the second outlet of the separation mechanism (1).

6. The desulfurization slurry monitoring system according to claim 1, It is characterized in that The liquid outlet of the buffer box (3) is higher than the detection port of the detection mechanism (4) in the vertical direction.

7. The desulfurization slurry monitoring system according to claim 1, It is characterized in that The diameter of the mixed liquid inlet of the buffer tank (3) is smaller than the diameter of the liquid outlet of the buffer tank (3).

8. A control method for a desulfurization slurry monitoring system, applied to the desulfurization slurry monitoring system according to any one of claims 1 to 7, It is characterized in that The method comprises: Determine that the system starts running instructions, control the separation mechanism to start inputting the desulfurized slurry, and then control the separation mechanism to start conveying the second mixed liquid to the buffer tank; It is determined that a system stop operation instruction is received, the separation mechanism is controlled to stop conveying the second mixed liquid to the buffer tank, and then the separation mechanism is controlled to stop inputting the desulfurization slurry.

9. A desulfurization system, It is characterized in that A desulfurization slurry monitoring system comprising any one of claims 1-7.

10. A thermal power generating unit, It is characterized in that Includes the desulfurization system as described in claim 9.

Images