Automatic pH value regulation and control device for carbon roasting desulfurization

Abstract

The utility model belongs to the technical field of flue gas desulfurization, and particularly relates to an automatic pH value regulating and controlling device for carbon roasting desulfurization, which comprises a desulfurization spraying pool used for containing desulfurization alkali liquor, and a liquid level sensor is arranged in the desulfurization spraying pool; the pH value detection pool is connected with the desulfurization spraying pool through a branch pipeline, a pH value detector is arranged in the pH value detection pool, the pH value detector comprises a detection probe, a liquid outlet is formed in the bottom of the pH value detection pool, an electromagnetic drain valve is arranged at the liquid outlet, the liquid outlet is connected with a drain pipe, an overflow port is formed in the top of the pH value detection pool, the pH value detection pool is connected with a flushing assembly, and the flushing assembly is connected with the desulfurization spraying pool. The flushing assembly is used for flushing a detection probe of the pH value detector with clear water at regular time; and the PLC control system is electrically connected with the liquid level sensor and the pH value detector. The automatic pH value regulation and control device for carbon roasting desulfurization is accurate in detection result and capable of automatically supplying alkali liquor.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas desulfurization technology, and in particular relates to an automatic pH control device for carbon roasting desulfurization. Background Technology

[0002] With the development of the power industry, the amount of pollutants generated during power production by coal-fired power plants and other coal-fired industries has increased significantly. Among them, sulfur dioxide (SO2) emitted from coal combustion is a major pollutant contributing to acid rain and the greenhouse effect. Coal-fired power plants need to construct desulfurization systems to reduce SO2 emissions. Currently, wet flue gas desulfurization (WFGD) accounts for more than 80% of global desulfurization processes. It uses a liquid containing lime slurry to wash sulfur-containing flue gas, achieving a removal rate of over 95%.

[0003] Traditional methods for flue gas desulfurization from carbon plant roasting furnaces typically involve first washing and dust removal, then using electrostatic precipitators to remove some tar, and finally entering the desulfurization absorption unit. During the desulfurization absorption process, the pH value of the desulfurization slurry is a key factor affecting desulfurization efficiency. The pH level directly affects SO2 absorption and limestone dissolution; therefore, controlling the slurry pH within a reasonable range is crucial for improving desulfurization efficiency. However, the presence of a large number of suspended particles, impurities, and tar in the flue gas desulfurization water distorts pH readings, making automatic replenishment of the alkaline solution for adjusting the flue gas desulfurization pH impossible. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the deficiencies and defects mentioned in the background art above, and to provide an automatic pH control device for carbon roasting desulfurization with accurate detection results and automatic alkali replenishment.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is: an automatic pH control device for carbon roasting desulfurization, comprising:

[0006] The desulfurization spray tank is used to hold the desulfurization alkaline solution, and a liquid level sensor is installed inside the desulfurization spray tank.

[0007] A pH value testing tank is connected to the desulfurization spray tank via a branch pipe. The pH value testing tank is equipped with a pH value detector, which includes a detection probe. The bottom of the pH value testing tank has a liquid outlet with an electromagnetic drain valve connected to a drain pipe. The top has an overflow outlet. The pH value testing tank is also connected to a rinsing assembly, which is used to periodically rinse the detection probe of the pH value detector with clean water.

[0008] The PLC control system is electrically connected to the level sensor and pH meter.

[0009] In an embodiment, the pH detection tank is provided with an inlet, the inlet is controlled by an electromagnetic valve, the inlet is connected with the desulfurization spray tank by a conveying pump, the conveying pump is connected with the PLC control system, and the outlet is connected with a drain pipe which is connected with the desulfurization spray tank.

[0010] In an embodiment, the desulfurization spray tank is provided with a liquid supplement pipe, the liquid supplement pipe is provided with a liquid supplement pump, the liquid supplement pump is electrically connected with the PLC control system, when the liquid level sensor detects that the liquid level in the desulfurization spray tank reaches the lowest liquid level or the pH detector detects that the detection result is lower than the preset pH value, the PLC control system controls the liquid supplement pump to start the liquid supplement work, and when the liquid level sensor detects that the liquid level in the desulfurization spray tank reaches the highest liquid level, the PLC control system controls the liquid supplement pump to stop the liquid supplement.

[0011] In an embodiment, the branch pipe and the liquid supplement pipe are made of corrosion-resistant materials.

[0012] In an embodiment, the flushing assembly comprises a water pipe and a spray head arranged at the end of the water pipe, and the spray head is opposite to the detection probe of the pH detector.

[0013] In an embodiment, the pressure of the spray head is 0.2-0.4 MPa.

[0014] In an embodiment, the pH detection tank is provided with a support arranged at the side, the pH detector is arranged on the support, the detection probe of the pH detector is below the liquid surface during detection, and during cleaning, the electromagnetic drain valve is opened and the electromagnetic valve of the inlet is closed by the PLC control system, so that the detection probe is exposed to the liquid surface, and then the flushing assembly is controlled by the PLC control system to clean the probe.

[0015] Compared with the prior art, the beneficial effects of the carbon roasting desulfurization pH value automatic regulation device are that: the carbon roasting desulfurization pH value automatic regulation device comprises a desulfurization spray pool for containing alkali solution, a liquid level sensor is arranged in the desulfurization spray pool; a pH value detection pool is connected with the desulfurization spray pool through a branch pipeline of a conveying pump, a pH value detector is arranged in the pH value detection pool, the pH value detector comprises a detection probe, an electromagnetic drain valve is arranged at the bottom of the pH value detection pool, a water overflow port is arranged at the top of the pH value detection pool, and the pH value detection pool is connected with a flushing assembly, and the flushing assembly is used for flushing the detection probe of the pH value detector at a fixed time; a PLC control system PLC is electrically connected with the liquid level sensor and the pH value detector. When the liquid level sensor detects that the liquid level in the desulfurization spray pool reaches the lowest liquid level or the detection result of the pH value detector is lower than the preset pH value (generally neutral or weak alkaline, for example, pH is 7-8), the liquid supplementing pump is started to supplement liquid in the desulfurization spray pool, and the pH value of the alkali solution in the desulfurization spray pool is controlled. In the use process of the device, because the flue gas desulfurization water contains a large amount of suspended particles, impurities and tar, etc., the detection probe of the pH value detector is adsorbed with the suspended particles, tar and other impurities, in order to ensure the accuracy of the detection probe, the detection probe is cleaned at a fixed time through the water assembly. When cleaning, the electromagnetic drain valve at the bottom of the pH value detection pool is opened, the detection probe is exposed to the liquid surface, and cleaning is performed. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0017] Figure 1 It is a structure schematic view of the carbon roasting desulfurization pH value automatic regulation device of an embodiment.

[0018] The drawings show that: 10 is a desulfurization spray pool; 20 is a pH value detection pool; 30 is a pH value detector; 40 is a liquid level sensor; 50 is a flushing assembly; 12 is a branch pipeline; 14 is a liquid supplementing pipe; 22 is a liquid discharge pipe; and 24 is a water overflow port. DETAILED DESCRIPTION

[0019] In order to make the above and other features and advantages of the present application clearer, the following will further describe the present application with reference to the drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation and are only exemplary, not limiting.

[0020] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0021] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0022] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] In the utility model, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0024] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0025] Please refer to Figure 1 The carbon roasting desulfurization pH value automatic control device of an embodiment mainly comprises: a desulfurization spray pool 10, a pH value detection pool 20, a pH value detector 30 arranged in the pH value detection pool 20, a flushing assembly 50 and a PLC control system (not shown in the figure). The desulfurization spray pool 10 is provided with a liquid level sensor 40. The desulfurization spray pool 10 is used to hold lye. In order to ensure the desulfurization effect of the flue gas generated by carbon roasting, the lye in the desulfurization spray pool 10 is generally sodium hydroxide. Since the lye in the desulfurization spray pool 10 is continuously circulated during use, the pH value may be weakly alkaline or neutral or even acidic during use, resulting in desulfurization failure. Therefore, it is necessary to ensure that the liquid in the desulfurization spray pool 10 always remains in a strong alkaline state. In order to detect the pH value in the desulfurization spray pool 10 in real time, the liquid in the desulfurization spray pool 10 is transported to the pH value detection pool 20, and real-time detection is performed by the pH value detector 30 in the pH value detection pool 20. Since the pH value detector 30 is generally placed in the pH value detection pool 20, the detection probe of the pH value detector 30 is easy to deposit impurities, thereby affecting the detection result and distorting the detection result. In order to solve this problem, the flushing assembly 50 is arranged in the pH value detection pool 20, and the PLC control system controls the flushing assembly 50 to work at a certain time, so that the detection probe of the pH value detector 30 will not deposit impurities, so that the detection data can be obtained. Real and reliable detection data can further control the supply of lye in the desulfurization spray pool 10.

[0026] Specifically, the desulfurization spray pool 10 is provided with an inlet and an outlet, and the inlet and the outlet are controlled by electromagnetic valves. The desulfurization spray pool 10 is provided with a branch pipeline 12 at the outlet, and the branch pipeline 12 is provided with a delivery pump. The delivery pump is connected with the PLC control system. When it is needed to deliver the sample to the pH value detection pool 20 for detection, the liquid in the desulfurization spray pool 10 is delivered to the pH value detection pool 20 through the branch pipeline 12, and the pH value of the liquid is detected by the pH value detector 30. In an embodiment, the inlet of the desulfurization spray pool 10 is connected with a liquid supplement pipeline 14, and the liquid supplement pipeline 14 is provided with a liquid supplement pump. The liquid supplement pump is electrically connected with the PLC control system. When the liquid level sensor 40 detects that the liquid level in the desulfurization spray pool 10 reaches the lowest liquid level or the detection result of the pH value detector 30 is lower than the preset pH value (generally weak alkaline or neutral, pH is 7-8), the PLC control system controls the liquid supplement pump to start the liquid supplement work. When the liquid level sensor 40 detects that the liquid level in the desulfurization spray pool 10 reaches the highest liquid level, the PLC control system controls the liquid supplement pump to stop the liquid supplement. The lowest liquid level and the highest liquid level of the desulfurization spray pool 10 can be calculated and determined according to the volume and height of the desulfurization spray pool 10. After the determination, as long as the liquid level sensor 40 detects the corresponding liquid level value, the start and stop of the liquid supplement pump can be controlled.

[0027] Preferably, the materials of the branch pipeline 12 and the liquid supplement pipeline 14 are corrosion-resistant materials, and specifically can be polypropylene (PP), polyvinyl chloride (PVC), glass fiber reinforced plastic (FRP) and the like.

[0028] Specifically, in an embodiment, the bottom of the pH value detection pool 20 is provided with an electromagnetic drain valve and is connected with a liquid discharge pipeline 22, and the top is provided with an overflow port. The liquid in the desulfurization spray pool 10 enters the pH value detection pool through the branch pipeline 12, and in order to ensure that the detection probe of the pH value detector 30 is below the liquid surface, the liquid flowing through the branch pipeline 12 stops when the liquid overflows from the overflow port. A support is installed on the side of the pH value detection pool 20, and the pH value detector 30 is arranged on the support. The detection probe of the pH value detector 30 is below the liquid surface during detection. When it is needed to clean the pH value detector 30, the electromagnetic drain valve at the bottom of the desulfurization spray pool 10 is opened through the PLC control system, the liquid is discharged through the liquid discharge pipeline 22, so that the detection probe is exposed above the liquid surface, and then the detection probe is cleaned by the flushing assembly 50 controlled by the PLC control system. In an embodiment, the flushing assembly 50 includes a water pipe and a spray head arranged at the end of the water pipe, and the spray head directly faces the detection probe of the pH value detector 30. The pressure of the spray head is 0.4-0.6 MPa, and more preferably 0.5 MPa or higher, so that the detection probe can be better cleaned. Specifically, the detection probe is cleaned at regular intervals, for example, the detection probe is cleaned once every 10-15 minutes.

[0029] In the automatic pH value regulating device for carbon roasting desulfurization, when the liquid level sensor 40 detects that the liquid level in the desulfurization spray pool 10 reaches the lowest liquid level or the pH value detector 30 detects a result lower than the preset pH value (generally neutral or weak alkaline, for example, pH 7-8), the liquid supplementing work for the desulfurization spray pool 10 is started, and the pH value of the lye in the desulfurization spray pool 10 is controlled to be strongly alkaline. In order to ensure the accuracy of the detection probe, the detection probe is cleaned regularly through the flushing assembly 50. During cleaning, the electromagnetic drain valve at the bottom of the pH value detection pool 10 is opened first, the liquid is discharged through the drain pipe 22, the detection probe is exposed to the liquid surface, the nozzle of the flushing assembly 50 is aimed at the detection probe, and the detection probe can be cleaned completely in combination with the certain pressure of the nozzle, so that the accuracy of the pH value detection result is ensured, the liquid can be supplemented in time, and the pH value of the desulfurization spray pool 10 can be controlled accurately.

[0030] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as the limitation of the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.

Claims

1. A device for automatic pH control during desulfurization of carbon baking, characterized in that, The utility model relates to a desulfurization spray tank for containing desulfurization lye, a liquid level sensor is arranged in the desulfurization spray tank. A pH value detection tank is connected to the desulfurization spray tank through a branch pipeline, a pH value detector is arranged in the pH value detection tank, the pH value detector comprises a detection probe, a liquid outlet is arranged at the bottom of the pH value detection tank, an electromagnetic drain valve is arranged at the liquid outlet, and a drain pipe is connected to the electromagnetic drain valve, a water overflow port is arranged at the top of the pH value detection tank, and a flushing assembly is connected to the pH value detection tank, the flushing assembly is used for flushing the detection probe of the pH value detector with clean water at regular time intervals. A PLC control system is electrically connected to the liquid level sensor and the pH value detector. The pH value detection tank is provided with a liquid inlet, the liquid inlet is controlled by an electromagnetic valve, the liquid inlet is connected to the desulfurization spray tank through a conveying pump, the conveying pump is connected to the PLC control system, and the drain pipe connected to the liquid outlet is connected to the desulfurization spray tank.

2. The carbon roasting desulfurization pH value automatic control device according to claim 1, characterized in that, The liquid inlet of the desulfurization spray tank is connected to a liquid supplementing pipe, a liquid supplementing pump is arranged on the liquid supplementing pipe, the liquid supplementing pump is electrically connected to the PLC control system, when the liquid level sensor detects that the liquid level in the desulfurization spray tank reaches the lowest liquid level or the pH value detector detects a result lower than a preset pH value, the PLC control system controls the liquid supplementing pump to start liquid supplementing work, and when the liquid level sensor detects that the liquid level in the desulfurization spray tank reaches the highest liquid level, the PLC control system controls the liquid supplementing pump to stop liquid supplementing.

3. The carbon roasting desulfurization pH value automatic control device according to claim 2, characterized in that, The branch pipeline and the liquid supplementing pipe are made of a corrosion-resistant material.

4. The carbon baking desulfurization pH value automatic control device according to claim 3, characterized in that, The flushing assembly comprises a water pipe and a spray head arranged at the end of the water pipe, and the spray head faces the detection probe of the pH value detector.

5. The carbon baking desulfurization pH value automatic control device according to claim 1, characterized in that, The pressure of the spray head is 0.2-0.4 MPa.

6. The carbon baking desulfurization pH value automatic control device according to claim 5, characterized in that, A support is arranged at the side of the pH value detection tank, the pH value detector is arranged on the support, and the detection probe of the pH value detector is located below the liquid surface during detection.

7. The carbon roasting desulfurization pH value automatic control device according to claim 1, characterized in that, ​

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