Automatic slurry supply system and wet flue gas desulfurization equipment

Abstract

The invention provides an automatic slurry supply system and wet flue gas desulfurization equipment. The automatic slurry supply system comprises a slurry tank, a slurry supply pump, a first valve body, a first detection module and a control module, wherein the liquid inlet end of the slurry supply pump is connected with the liquid outlet end of the slurry tank, the liquid outlet end of the slurry supply pump is connected with the liquid inlet end of a slurry circulation loop in the absorption tower, and the first valve body is arranged between the liquid outlet end of the slurry supply pump and the liquid inlet end of the slurry circulation loop; the first detection module is used for detecting the PH value of spraying slurry in the absorption tower, and the control module is used for controlling the slurry supply pump to be started, controlling the first valve body to reach the basic opening degree and controlling the opening degree of the first valve body according to the PH value of the spraying slurry so that the PH value of the spraying slurry can be within the preset range. According to the automatic slurry supply system and the wet flue gas desulfurization equipment disclosed by the invention, automatic slurry supply of the alkaline slurry is realized, so that the pH value of the spraying slurry of the absorption tower can be stably in a preset range, and the relatively high desulfurization efficiency and desulfurization quality are further ensured.

Description

Technical Field

[0001] This disclosure relates to the field of alkaline slurry supply technology, and in particular to an automatic slurry supply system and a wet flue gas desulfurization device. Background Technology

[0002] Wet flue gas desulfurization (FGD) is currently the most widely used and technologically mature FGD process, especially suitable for large coal-fired power plants, steel plants, and the chemical industry. Its core principle is to efficiently remove acidic pollutants such as sulfur dioxide by washing the flue gas with an alkaline slurry (such as limestone slurry).

[0003] Currently, the supply of alkaline slurry in desulfurization equipment cannot be automated. The manual supply method causes the pH value of the sprayed slurry in the absorption tower to easily exceed the preset range, which seriously affects the desulfurization efficiency and quality. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, the purpose of this disclosure is to provide an automatic slurry supply system and a wet flue gas desulfurization device.

[0006] To achieve the above objectives, the first aspect of this disclosure provides an automatic slurry supply system, comprising: a slurry tank, a slurry supply pump, a first valve body, a first detection module, and a control module; wherein, the slurry tank contains alkaline slurry, and the inlet end of the slurry supply pump is connected to the outlet end of the slurry tank, the outlet end of the slurry supply pump is connected to the inlet end of the slurry circulation loop in the absorption tower, and the first valve body is disposed between the outlet end of the slurry supply pump and the inlet end of the slurry circulation loop; the first detection module is used to detect the pH value of the sprayed slurry in the absorption tower, the signal input end of the control module is connected to the signal output end of the first detection module, the signal output end of the control module is connected to the signal input end of the slurry supply pump and the signal input end of the first valve body, the control module is used to control the slurry supply pump to open and control the first valve body to a basic opening degree, and control the opening degree of the first valve body according to the pH value of the sprayed slurry so that the pH value of the sprayed slurry is within a preset range.

[0007] Optionally, the control module is configured to, when the pH value of the sprayed slurry is lower than the median value of the preset range, obtain a first difference between the pH value of the sprayed slurry and the median value of the preset range, and increase the opening of the first valve body according to a first proportion corresponding to the first difference; when the pH value of the sprayed slurry is higher than the median value of the preset range, obtain a second difference between the pH value of the sprayed slurry and the median value of the preset range, and decrease the opening of the first valve body according to a second proportion corresponding to the second difference.

[0008] Optionally, the system further includes: multiple slurry supply branches, which are respectively disposed between the outlet end of the first valve body and the inlet end of multiple slurry circulation loops in the absorption tower. Each slurry supply branch includes: a second valve body and a second detection module. The inlet end of the second valve body is connected to the outlet end of the first valve body, and the outlet end of the second valve body is connected to the inlet end of the corresponding slurry circulation loop. The detection end of the second detection module is disposed at the inlet end of the second valve body, and the second detection module is used to detect the inlet flow rate of the second valve body. The signal input end of the control module is connected to the signal output end of the second detection module, and the signal output end of the control module is connected to the signal input end of the second valve body. The control module is used to control the opening degree of the second valve body according to the inlet flow rate of the second valve body, so that the flow rates among the multiple slurry supply branches are in a preset ratio.

[0009] Optionally, the system further includes: a third valve body and a third detection module. The inlet of the third valve body is supplied with pressurized flushing water, and the outlet of the third valve body is connected to the inlet of multiple second valve bodies. The detection end of the third detection module is located at the outlet of the third valve body, and the third detection module is used to detect the outlet pressure of the first valve body. The slurry supply branch further includes: a fourth valve body. The inlet of the fourth valve body is connected to the outlet of the corresponding slurry circulation loop, and the outlet of the fourth valve body is connected to a flushing water collection device. The signal input of the control module is connected to the signal output of the third detection module, and the signal output of the control module is connected to the signal input of the third valve body and the signal input of the fourth valve body. The control module is used to control the first valve body and the slurry circulation loop to close when the outlet pressure of the first valve body is higher than a preset pressure, and to control the third valve body and the fourth valve body to open.

[0010] Optionally, the system further includes: a fifth valve body, which is disposed between the liquid outlet of the first valve body and the liquid inlet of a plurality of second valve bodies, and the liquid inlet of the fifth valve body is connected to the liquid outlet of the first valve body, and the liquid outlet of the fifth valve body is connected to the liquid inlet of a plurality of second valve bodies; the detection end of the third detection module is disposed at the liquid outlet of the fifth valve body; wherein, the signal output end of the control module is connected to the signal input end of the fifth valve body, and the control module is used to control the fifth valve body to close when the liquid outlet pressure of the first valve body is higher than a preset pressure.

[0011] Optionally, the system further includes: a fourth detection module, wherein the detection end of the fourth detection module is disposed at the liquid outlet end of the first valve body, and the fourth detection module is used to detect the liquid flow rate of the first valve body; wherein the signal input end of the control module is connected to the signal output end of the fourth detection module, and the control module is used to control the opening degree of the first valve body according to the liquid flow rate of the first valve body.

[0012] Optionally, the system further includes: a sixth valve body, a seventh valve body, and an eighth valve body; wherein, the inlet end of the sixth valve body is connected to the outlet end of the slurry pump, and the outlet end of the sixth valve body is connected to the inlet end of the slurry tank; pressurized flushing water is introduced into the inlet end of the seventh valve body, and the outlet end of the seventh valve body is connected to the inlet end of the sixth valve body; the inlet end of the eighth valve body is connected to the outlet end of the slurry tank, and the outlet end of the eighth valve body is connected to a flushing water collection device; the signal output terminal of the control module is connected to the signal input terminals of the sixth valve body, the seventh valve body, and the eighth valve body, respectively; and the control module is used to control the first valve body and the slurry pump to close when the outlet flow rate of the first valve body is lower than a preset flow rate, and to control the sixth valve body, the seventh valve body, and the eighth valve body to open.

[0013] Optionally, the system further includes: a fifth detection module, wherein the detection end of the fifth detection module is disposed inside the slurry tank, and the fifth detection module is used to detect the liquid level of the slurry tank; wherein the signal input end of the control module is connected to the signal output end of the fifth detection module, and the control module is used to control the slurry pump and the first valve body to close when the liquid level of the slurry tank is lower than a preset liquid level.

[0014] Optionally, the system further includes: a ninth valve body, which is disposed between the liquid outlet end of the first valve body and the liquid inlet end of the absorption tower, and the liquid inlet end of the ninth valve body is connected to the liquid outlet end of the first valve body, the liquid outlet end of the ninth valve body is connected to the liquid inlet end of the tower body, and the signal output end of the control module is connected to the signal input end of the ninth valve body.

[0015] The second aspect of this disclosure provides a wet flue gas desulfurization device, comprising: an absorption tower and an automatic slurry supply system as provided in the first aspect of this disclosure; wherein the absorption tower comprises: a tower body and a slurry circulation loop, the inlet end of the slurry circulation loop is connected to the outlet end of the slurry pool at the bottom of the tower body, and the outlet end of the slurry circulation loop is connected to the spray inlet end at the top of the tower body.

[0016] The technical solution provided in this disclosure may include the following beneficial effects:

[0017] The control module uses the first detection module to obtain the pH value of the sprayed slurry in the absorption tower, and controls the opening of the first valve body according to the pH value of the sprayed slurry. This achieves automatic supply of alkaline slurry, ensuring that the pH value of the sprayed slurry in the absorption tower remains stably within a preset range, thereby guaranteeing high desulfurization efficiency and quality.

[0018] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 This is a schematic diagram of the structure of an automatic slurry supply system according to an embodiment of this disclosure;

[0021] As shown in the figure: 1. Slurry tank, 2. Slurry pump, 3. First valve body, 4. First detection module, 5. Second valve body, 6. Second detection module, 7. Third valve body, 8. Third detection module, 9. Fourth valve body, 10. Fifth valve body, 11. Fourth detection module, 12. Sixth valve body, 13. Seventh valve body, 14. Eighth valve body, 15. Fifth detection module, 16. Ninth valve body;

[0022] 100. Tower body; 200. Slurry circulation loop. Detailed Implementation

[0023] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0024] like Figure 1As shown in the figure, this disclosure proposes an automatic slurry supply system, including: a slurry tank 1, a slurry pump 2, a first valve body 3, a first detection module 4, and a control module (not shown in the figure). The slurry tank 1 contains alkaline slurry, and the inlet end of the slurry pump 2 is connected to the outlet end of the slurry tank 1. The outlet end of the slurry pump 2 is connected to the inlet end of the slurry circulation loop 200 in the absorption tower. The first valve body 3 is located between the outlet end of the slurry pump 2 and the inlet end of the slurry circulation loop 200. The first detection module 4 is used to detect the pH value of the sprayed slurry in the absorption tower. The signal input end of the control module is connected to the signal output end of the first detection module 4, and the signal output end of the control module is connected to the signal input end of the slurry pump 2 and the signal input end of the first valve body 3. The control module is used to control the slurry pump 2 to open and control the first valve body 3 to a basic opening degree, and to control the opening degree of the first valve body 3 according to the pH value (hydrogen ion concentration index) of the sprayed slurry, so that the pH value of the sprayed slurry is within a preset range.

[0025] Understandably, since the inlet of the slurry pump 2 is connected to the outlet of the slurry tank 1, and the outlet of the slurry pump 2 is connected to the inlet of the slurry circulation loop 200 in the absorption tower, and the signal output of the control module is connected to the signal input of the slurry pump 2, the control module can control the slurry pump 2 to start, thereby using the slurry pump 2 to transport the alkaline slurry in the slurry tank 1 to the slurry circulation loop 200 in the absorption tower, thus realizing the rapid replenishment of alkaline slurry into the absorption tower. Furthermore, since the first valve body 3 is located between the outlet of the slurry pump 2 and the inlet of the slurry circulation loop 200, and the signal input of the control module is connected to the signal output of the first detection module 4, and the signal output of the control module is connected to the signal input of the first valve body 3, the control module can use the first detection module 4 to obtain the pH value of the sprayed slurry in the absorption tower, and control the opening degree of the first valve body 3 according to the pH value of the sprayed slurry. This enables automatic supply of alkaline slurry, ensuring that the pH value of the sprayed slurry in the absorption tower remains stable within the preset range, thereby guaranteeing high desulfurization efficiency and quality.

[0026] It should be noted that the alkaline slurry is used to contact the flue gas countercurrently in the absorption tower, thereby undergoing a chemical reaction to remove sulfur dioxide. The pH value of the alkaline slurry in the spray layer (spray slurry) in the absorption tower can be 5.2-5.8 (preset range), and there are no restrictions on this.

[0027] The slurry tank 1 is used to store alkaline slurry. The specific type of slurry tank 1 can be set according to actual needs and there is no limitation. For example, the slurry tank 1 can be a box structure, with the bottom connected to the liquid outlet and the liquid inlet of the slurry pump 2, and the top used as the liquid inlet for replenishing alkaline slurry.

[0028] The slurry pump 2 is used to pressurize and transport the alkaline slurry in the slurry tank 1 to the slurry circulation loop 200 of the absorption tower. The specific type of slurry pump 2 can be set according to actual needs and there is no restriction on it. Multiple sets of slurry pump 2 can be used to achieve a redundant slurry supply structure.

[0029] In contrast to directly pumping the alkaline slurry to the inlet end of the absorption tower 100, the method of pumping the alkaline slurry into the slurry circulation loop 200 allows the alkaline slurry to be fully mixed with the circulating slurry in the slurry circulation loop 200, thereby enabling rapid control of the pH value of the sprayed slurry.

[0030] The first valve body 3 is used to regulate the flow rate of the alkaline slurry by controlling its opening degree, thereby regulating the pH value of the sprayed slurry in the absorption tower. The specific type of the first valve body 3 can be set according to actual needs and is not limited thereto. For example, the first valve body 3 can be an electric regulating valve. The basic opening degree of the first valve body 3 can be 10%, corresponding to a basic flow rate of 3m³ / h. 3 / Hour.

[0031] The detection end of the first detection module 4 is placed in the spray layer of the absorption tower body 100 and is used to detect the pH value of the spray slurry in the absorption tower. The specific type of the first detection module 4 can be set according to actual needs and there is no limitation. For example, the first detection module 4 can be a pH sensor.

[0032] The control module is used for the automated supply of alkaline slurry. The specific type of control module can be set according to actual needs and there is no restriction on it. For example, the control module can be a DCS (Distributed Control System) programmable control system.

[0033] In some embodiments, the control module is configured to, when the pH value of the sprayed slurry is lower than the median value of a preset range, obtain a first difference between the pH value of the sprayed slurry and the median value of the preset range, and increase the opening of the first valve body 3 according to a first proportion corresponding to the first difference; when the pH value of the sprayed slurry is higher than the median value of the preset range, obtain a second difference between the pH value of the sprayed slurry and the median value of the preset range, and decrease the opening of the first valve body 3 according to a second proportion corresponding to the second difference.

[0034] Understandably, when the pH value of the sprayed slurry is lower than the middle value of the preset range, the first difference between the pH value of the sprayed slurry and the middle value of the preset range is obtained, and the opening of the first valve body 3 is increased according to the first ratio corresponding to the first difference, thereby realizing the rapid adjustment of the pH value of the sprayed slurry, and thus ensuring that the pH value of the sprayed slurry can be stably kept within the preset range.

[0035] When the pH value of the sprayed slurry is higher than the median value of the preset range, a second difference between the pH value of the sprayed slurry and the median value of the preset range is obtained, and the opening of the first valve body 3 is reduced according to the second ratio corresponding to the second difference, thereby realizing the rapid adjustment of the pH value of the sprayed slurry, and thus ensuring that the pH value of the sprayed slurry can be stably kept within the preset range.

[0036] It should be noted that different first differences correspond to different first ratios; the larger the first difference, the larger the corresponding first ratio. For example, when the pH value of the sprayed slurry is below 5.4 mg / m³... 3 When the value is at the intermediate level, the control module controls the opening of the first valve body 3 to increase by 1%, and the synchronous flow rate increases by 3%. If the value continues to decrease, the opening of the first valve body 3 will continue to increase.

[0037] Different second differences correspond to different second ratios; the larger the second difference, the larger the corresponding second ratio. For example, when the pH value of the sprayed slurry is higher than 5.4 mg / m³... 3 When the value is at the intermediate level, the control module controls the opening of the first valve body 3 to decrease by 1%, and the synchronous flow rate to decrease by 3%. If the value continues to increase, the opening of the first valve body 3 will continue to decrease.

[0038] Under the automatic regulation of the control module, the pH value fluctuates slightly within the preset range, achieving fine adjustment.

[0039] In addition, the slurry supply flow rate is increased according to the flue gas flow rate, the pH value of the slurry sprayed in the absorption tower, and the sulfur dioxide concentration at the inlet of the original flue gas in the absorption tower (see the table below), and the automatic adjustment is achieved by changing the opening of the first valve body 3.

[0040] (1) When the load (flue gas flow rate) changes and the original flue gas sulfur dioxide fluctuation is small:

[0041]

[0042]

[0043] (II) When the load remains constant (taking 200MW as an example), and the sulfur dioxide emissions from the raw flue gas fluctuate greatly:

[0044]

[0045] like Figure 1As shown, in some embodiments, the system further includes: multiple slurry supply branches, which are respectively disposed between the liquid outlet of the first valve body 3 and the liquid inlet of multiple slurry circulation loops 200 in the absorption tower, and the slurry supply branches include: a second valve body 5 and a second detection module 6, the liquid inlet of the second valve body 5 is connected to the liquid outlet of the first valve body 3, the liquid outlet of the second valve body 5 is connected to the liquid inlet of the corresponding slurry circulation loop 200, the detection end of the second detection module 6 is disposed at the liquid inlet of the second valve body 5, and the second detection module 6 is used to detect the liquid inlet flow rate of the second valve body 5.

[0046] The signal input terminal of the control module is connected to the signal output terminal of the second detection module 6, and the signal output terminal of the control module is connected to the signal input terminal of the second valve body 5. The control module is used to control the opening degree of the second valve body 5 according to the liquid inlet flow rate of the second valve body 5, so that the flow rates between multiple slurry supply branches are in a preset ratio.

[0047] It is understandable that, since multiple slurry supply branches are respectively set between the liquid outlet of the first valve body 3 and the liquid inlet of multiple slurry circulation loops 200 in the absorption tower, and the liquid inlet of the second valve body 5 is connected to the liquid outlet of the first valve body 3, and the liquid outlet of the second valve body 5 is connected to the liquid inlet of the corresponding slurry circulation loop 200, multiple second valve bodies 5 can respectively control the opening and closing of the passage and the flow rate between the first valve body 3 and multiple slurry circulation loops 200.

[0048] Furthermore, since the detection end of the second detection module 6 is located at the liquid inlet end of the second valve body 5, and the signal input end of the control module is connected to the signal output end of the second detection module 6, and the signal output end of the control module is connected to the signal input end of the second valve body 5, the control module can obtain the liquid inlet flow rate of the second valve body 5 using the second detection module 6. Based on the liquid inlet flow rate of the second valve body 5, the opening degree of the second valve body 5 is controlled, thereby ensuring that the flow rates among the multiple slurry supply branches are in a preset ratio. This achieves flexible and accurate supply of alkaline slurry to each slurry circulation loop 200 of the absorption tower, thus ensuring precise adjustment of the pH value of the sprayed slurry in the absorption tower.

[0049] It should be noted that the number of slurry supply branches is the same as the number of slurry circulation loops 200 in the absorption tower, and they correspond one-to-one. For example, when there are three slurry circulation loops 200, the number of slurry supply branches is also three. That is to say, there are three sets of second valve bodies 5 and second detection modules 6.

[0050] The second valve body 5 is used for on / off control and flow regulation of the passage between the first valve body 3 and the corresponding slurry circulation loop 200. The specific type of the second valve body 5 can be set according to actual needs and is not limited thereto. For example, the second valve body 5 can be an electric shut-off valve.

[0051] The second detection module 6 is used to detect the inlet flow rate of the second valve body 5, so as to realize the automatic control of the opening degree of the second valve body 5 by utilizing the inlet flow rate of the second valve body 5. The specific type of the second detection module 6 can be set according to actual needs and there is no restriction. For example, the second detection module 6 can be a flow sensor.

[0052] like Figure 1 As shown, in some embodiments, the system further includes: a third valve body 7 and a third detection module 8. The inlet end of the third valve body 7 is supplied with pressurized flushing water, and the outlet end of the third valve body 7 is connected to the inlet ends of a plurality of second valve bodies 5 respectively. The detection end of the third detection module 8 is set at the outlet end of the third valve body 7, and the third detection module 8 is used to detect the outlet pressure of the first valve body 3. The slurry supply branch further includes: a fourth valve body 9. The inlet end of the fourth valve body 9 is connected to the outlet end of the corresponding slurry circulation loop 200, and the outlet end of the fourth valve body 9 is connected to the flushing water collection device.

[0053] The signal input terminal of the control module is connected to the signal output terminal of the third detection module 8, and the signal output terminal of the control module is connected to the signal input terminal of the third valve body 7 and the signal input terminal of the fourth valve body 9 respectively. The control module is used to control the first valve body 3 and the slurry circulation loop 200 to close when the liquid outlet pressure of the first valve body 3 is higher than the preset pressure, and to control the third valve body 7 and the fourth valve body 9 to open.

[0054] It is understandable that, since the inlet end of the third valve body 7 is supplied with pressure flushing water and the outlet end of the third valve body 7 is connected to the inlet ends of multiple second valve bodies 5 respectively, when the third valve body 7 is turned on, pressure flushing water can be supplied to the second valve bodies 5. Furthermore, since the inlet end of the fourth valve body 9 is connected to the outlet end of the corresponding slurry circulation loop 200 and the outlet end of the fourth valve body 9 is connected to the flushing water collection device, when the fourth valve body 9 is turned on, pressure flushing water can be discharged from the slurry circulation loop 200 to the flushing water collection device.

[0055] Furthermore, since the detection end of the third detection module 8 is located at the liquid outlet end of the third valve body 7, and the signal input end of the control module is connected to the signal output end of the third detection module 8, and the signal output end of the control module is connected to the signal input end of the third valve body 7 and the signal input end of the fourth valve body 9 respectively, the control module can obtain the liquid outlet pressure of the first valve body 3 using the third detection module 8, and when the liquid outlet pressure of the first valve body 3 is higher than the preset pressure, control the first valve body 3 and the slurry circulation loop 200 to close, and control the third valve body 7 and the fourth valve body 9 to open, thereby realizing the flushing of the second valve body 5, the slurry circulation loop 200 and other parts, thereby ensuring the stable supply of alkaline slurry.

[0056] It should be noted that when the outlet pressure of the first valve body 3 is higher than the preset pressure, it indicates that there is a blockage problem in the second valve body 5, the slurry circulation loop 200, etc. The blockage is automatically flushed with flushing water, thereby achieving efficient supply of alkaline slurry.

[0057] The third valve body 7 and the fourth valve body 9 are used for the entry and exit of flushing water. The specific type of the third valve body 7 and the fourth valve body 9 can be set according to actual needs and there is no restriction. For example, the third valve body 7 and the fourth valve body 9 can be electric switching valves.

[0058] The third detection module 8 is used to detect the liquid outlet pressure of the first valve body 3. The specific type of the third detection module 8 can be set according to actual needs and there is no restriction on it. For example, the third detection module 8 can be a pressure sensor.

[0059] For example, the preset pressure can be 0.25 MPa, and after flushing, the pressure can be reduced to 0.12 MPa-0.15 MPa.

[0060] like Figure 1 As shown, in some embodiments, the system further includes: a fifth valve body 10, which is disposed between the liquid outlet end of the first valve body 3 and the liquid inlet ends of a plurality of second valve bodies 5, wherein the liquid inlet end of the fifth valve body 10 is connected to the liquid outlet end of the first valve body 3, and the liquid outlet end of the fifth valve body 10 is connected to the liquid inlet ends of the plurality of second valve bodies 5; the detection end of the third detection module 8 is disposed at the liquid outlet end of the fifth valve body 10. The signal output end of the control module is connected to the signal input end of the fifth valve body 10, and the control module is used to control the fifth valve body 10 to close when the liquid outlet pressure of the first valve body 3 is higher than a preset pressure.

[0061] It is understandable that, since the fifth valve body 10 is located between the liquid outlet end of the first valve body 3 and the liquid inlet ends of multiple second valve bodies 5, and the signal output end of the control module is connected to the signal input end of the fifth valve body 10, when the liquid outlet pressure of the first valve body 3 is higher than the preset pressure, the control module can control the fifth valve body 10 to close, thereby preventing the flushing water from impacting the first valve body 3, and thus forming an isolation and protection for the first valve body 3 and the slurry pump 2 and slurry tank 1 at the front end of the first valve body 3.

[0062] It should be noted that the fifth valve body 10 is used for the isolation of flushing water. The specific type of the fifth valve body 10 can be set according to actual needs, and there are no restrictions on it.

[0063] like Figure 1As shown, in some embodiments, the system further includes a fourth detection module 11, the detection end of which is disposed at the liquid outlet end of the first valve body 3, and the fourth detection module 11 is used to detect the liquid flow rate of the first valve body 3. The signal input end of the control module is connected to the signal output end of the fourth detection module 11, and the control module is used to control the opening degree of the first valve body 3 according to the liquid flow rate of the first valve body 3.

[0064] It is understandable that, since the detection end of the fourth detection module 11 is set at the liquid outlet end of the first valve body 3, and the signal input end of the control module is connected to the signal output end of the fourth detection module 11, the control module can use the fourth detection module 11 to obtain the liquid flow rate of the first valve body 3, and control the opening degree of the first valve body 3 according to the liquid flow rate of the first valve body 3, thereby achieving precise control of the opening degree of the first valve body 3.

[0065] It should be noted that the fourth detection module 11 is used to detect the liquid flow rate of the first valve body 3. The specific type of the fourth detection module 11 can be set according to actual needs and there is no limitation thereto. For example, the fourth detection module 11 can be a flow sensor.

[0066] like Figure 1 As shown, in some embodiments, the system further includes: a sixth valve body 12, a seventh valve body 13, and an eighth valve body 14. The inlet end of the sixth valve body 12 is connected to the outlet end of the slurry pump 2, and the outlet end of the sixth valve body 12 is connected to the inlet end of the slurry tank 1. Pressurized flushing water is introduced into the inlet end of the seventh valve body 13, and the outlet end of the seventh valve body 13 is connected to the inlet end of the sixth valve body 12. The inlet end of the eighth valve body 14 is connected to the outlet end of the slurry tank 1, and the outlet end of the eighth valve body 14 is connected to the flushing water collection device. The signal output terminal of the control module is connected to the signal input terminal of the sixth valve body 12, the signal input terminal of the seventh valve body 13, and the signal input terminal of the eighth valve body 14, respectively. The control module is used to control the first valve body 3 and the slurry pump 2 to close when the outlet flow rate of the first valve body 3 is lower than the preset flow rate, and to control the sixth valve body 12, the seventh valve body 13, and the eighth valve body 14 to open.

[0067] It is understandable that, since the inlet end of the sixth valve body 12 is connected to the outlet end of the slurry pump 2, and the outlet end of the sixth valve body 12 is connected to the inlet end of the slurry tank 1, a circulation path is formed between the slurry pump 2, the sixth valve body 12, and the slurry tank 1. Furthermore, since pressurized flushing water is introduced into the inlet end of the seventh valve body 13, and the outlet end of the seventh valve body 13 is connected to the inlet end of the sixth valve body 12, and the inlet end of the eighth valve body 14 is connected to the outlet end of the slurry tank 1, and the outlet end of the eighth valve body 14 is connected to the flushing water collection device, when the seventh valve body 13 is open, pressurized flushing water can be supplied to the sixth valve body 12, and when the eighth valve body 14 is open, pressurized flushing water can be discharged from the slurry tank 1 to the flushing water collection device.

[0068] Furthermore, since the signal output terminal of the control module is connected to the signal input terminals of the sixth valve body 12, the seventh valve body 13, and the eighth valve body 14 respectively, when the liquid flow rate of the first valve body 3 is lower than the preset flow rate, the control module can control the first valve body 3 and the slurry pump 2 to close, and control the sixth valve body 12, the seventh valve body 13, and the eighth valve body 14 to open, thereby realizing the flushing of the slurry pump 2, the slurry tank 1, and other parts, thus ensuring the stable supply of alkaline slurry.

[0069] It should be noted that the sixth valve body 12, the seventh valve body 13, and the eighth valve body 14 are used for the circulation, entry, and discharge of flushing water. The specific types of the sixth valve body 12, the seventh valve body 13, and the eighth valve body 14 can be set according to actual needs and there are no restrictions on this. For example, the sixth valve body 12, the seventh valve body 13, and the eighth valve body 14 can be electrically operated valves.

[0070] For example, the preset flow rate can be 1m. 3 / Hour.

[0071] like Figure 1 As shown, in some embodiments, the system further includes a fifth detection module 15, the detection end of which is disposed inside the slurry tank 1, and the fifth detection module 15 is used to detect the liquid level in the slurry tank 1. The signal input terminal of the control module is connected to the signal output terminal of the fifth detection module 15, and the control module is used to control the slurry pump 2 and the first valve body 3 to close when the liquid level in the slurry tank 1 is lower than a preset liquid level.

[0072] Understandably, since the detection end of the fifth detection module 15 is located inside the slurry tank 1, and the signal input end of the control module is connected to the signal output end of the fifth detection module 15, the control module can obtain the liquid level of the slurry tank 1 using the fifth detection module 15. Furthermore, when the liquid level of the slurry tank 1 is lower than the preset liquid level, the control module can control the slurry pump 2 and the first valve body 3 to close, thereby preventing the slurry pump 2 and other components from being damaged by idling.

[0073] It should be noted that the fifth detection module 15 is used to detect the liquid level in the slurry tank 1. The specific type of the fifth detection module 15 can be set according to actual needs and there are no restrictions on it. For example, the fifth detection module 15 can be a liquid level sensor.

[0074] For example, the preset liquid level can be 0.9 meters.

[0075] When the liquid level in the slurry tank 1 is lower than the preset liquid level, the control module can also simultaneously start flushing of the second valve body 5, the slurry circulation circuit 200, and other parts, as well as flushing of the slurry pump 2 and the slurry tank 1.

[0076] like Figure 1 As shown, in some embodiments, the system further includes: a ninth valve body 16, which is disposed between the liquid outlet end of the first valve body 3 and the liquid inlet end of the tower body 100 of the absorption tower, and the liquid inlet end of the ninth valve body 16 is connected to the liquid outlet end of the first valve body 3 and the liquid outlet end of the ninth valve body 16 is connected to the liquid inlet end of the tower body 100, and the signal output end of the control module is connected to the signal input end of the ninth valve body 16.

[0077] It is understandable that since the ninth valve body 16 is located between the liquid outlet end of the first valve body 3 and the liquid inlet end of the absorption tower body 100, and the signal output end of the control module is connected to the signal input end of the ninth valve body 16, the control module can control the opening and closing of the ninth valve body 16. Furthermore, when other passages fail, the control module can control the ninth valve body 16 to conduct, so that the passage between the liquid outlet end of the first valve body 3 and the liquid inlet end of the absorption tower body 100 can be used as a backup passage, thereby ensuring the stable slurry supply of the system.

[0078] It should be noted that the ninth valve body 16 is used to control the opening and closing of the passage between the liquid outlet end of the first valve body 3 and the liquid inlet end of the absorption tower body 100. The specific type of the ninth valve body 16 can be set according to actual needs and there is no restriction. For example, the ninth valve body 16 can be an electric switch valve.

[0079] In this embodiment, the passage between the liquid outlet of the first valve body 3 and the liquid inlet of the tower body 100 is a conventional slurry supply passage. The alkaline slurry is directly pumped to the slurry circulation loop 200, and the passage between the liquid outlet of the first valve body 3 and the liquid inlet of the tower body 100 is no longer used. The passage between the liquid outlet of the first valve body 3 and the liquid inlet of the tower body 100 is used as a backup passage.

[0080] This disclosure also provides a wet flue gas desulfurization device, including: an absorption tower and an automatic slurry supply system as described in this disclosure. The absorption tower includes: a tower body 100 and a slurry circulation loop 200. The inlet end of the slurry circulation loop 200 is connected to the outlet end of the slurry pool at the bottom of the tower body 100, and the outlet end of the slurry circulation loop 200 is connected to the spray inlet end at the top of the tower body 100.

[0081] Understandably, the control module uses the first detection module 4 to obtain the pH value of the sprayed slurry in the absorption tower, and controls the opening of the first valve body 3 based on the pH value of the sprayed slurry. This achieves automatic supply of alkaline slurry, ensuring that the pH value of the sprayed slurry in the absorption tower remains stably within a preset range, thereby guaranteeing high desulfurization efficiency and quality.

[0082] It should be noted that the slurry circulation loop 200 is used for the circulation of slurry in the tower body 100. The slurry sprayed and reacted with the flue gas is stored in the slurry pool. The slurry circulation loop 200 transports the slurry in the slurry pool back to the spray layer at the top of the tower body 100, thereby realizing the recycling of slurry.

[0083] In the slurry circulation loop 200, the circulation pump is used as the main component to realize the continuous circulation of slurry.

[0084] The system in this embodiment is simple in design, ingenious in structure, requires little investment for modification, greatly improves the safety of unit operation, meets the environmental protection requirements of the unit, reduces the risk of environmental incidents, and reduces the risk of personnel operation. It is suitable for all thermal power plants with wet desulfurization and has promotion and application value.

[0085] In the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0086] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0088] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. An automatic slurry supply system characterized by, The system comprises: a slurry tank, a slurry supply pump, a first valve body, a first detection module and a control module; wherein the slurry tank is provided with alkaline slurry, the liquid inlet end of the slurry supply pump is connected with the liquid outlet end of the slurry tank, the liquid outlet end of the slurry supply pump is connected with the liquid inlet end of a slurry circulation loop in an absorption tower, and the first valve body is arranged between the liquid outlet end of the slurry supply pump and the liquid inlet end of the slurry circulation loop; the first detection module is used for detecting the PH value of the sprayed slurry in the absorption tower, the signal input end of the control module is connected with the signal output end of the first detection module, the signal output end of the control module is connected with the signal input end of the slurry supply pump and the signal input end of the first valve body, the control module is used for controlling the slurry supply pump to be turned on and controlling the first valve body to reach a basic opening degree, and the opening degree of the first valve body is controlled according to the PH value of the sprayed slurry so that the PH value of the sprayed slurry is within a preset range.

2. The automatic slurry supply system according to claim 1, characterized in that, The control module is used for when the PH value of the sprayed slurry is lower than the middle value of the preset range, a first difference value between the PH value of the sprayed slurry and the middle value of the preset range is obtained, and the opening degree of the first valve body is increased according to a first proportional increase corresponding to the first difference value; when the PH value of the sprayed slurry is higher than the middle value of the preset range, a second difference value between the PH value of the sprayed slurry and the middle value of the preset range is obtained, and the opening degree of the first valve body is decreased according to a second proportional decrease corresponding to the second difference value.

3. The automatic slurry supply system according to claim 1, characterized by The system further comprises: a plurality of slurry supply branches, the plurality of slurry supply branches are respectively arranged between the liquid outlet end of the first valve body and the liquid inlet end of a plurality of slurry circulation loops in the absorption tower, and the slurry supply branch comprises a second valve body and a second detection module, the liquid inlet end of the second valve body is connected with the liquid outlet end of the first valve body, the liquid outlet end of the second valve body is connected with the liquid inlet end of the corresponding slurry circulation loop, and the detection end of the second detection module is arranged at the liquid inlet end of the second valve body, the second detection module is used for detecting the inlet flow of the second valve body; wherein the signal input end of the control module is connected with the signal output end of the second detection module, and the signal output end of the control module is connected with the signal input end of the second valve body, and the control module is used for controlling the opening degree of the second valve body according to the inlet flow of the second valve body, so that the flow among the plurality of slurry supply branches is in a preset proportion.

4. The automatic slurry supply system according to claim 3, wherein the system further comprises a third valve body and a third detection module, the liquid inlet end of the third valve body is connected with pressure flushing water, the liquid outlet end of the third valve body is connected with the liquid inlet end of a plurality of second valve bodies respectively, the detection end of the third detection module is arranged at the liquid outlet end of the third valve body, and the third detection module is used for detecting the outlet pressure of the first valve body; the slurry supply branch further comprises a fourth valve body, the liquid inlet end of the fourth valve body is connected with the liquid outlet end of the corresponding slurry circulation loop, and the liquid outlet end of the fourth valve body is connected with a flushing water collecting device. The signal input end of the control module is connected with the signal output end of the third detection module, the signal output end of the control module is connected with the signal input end of the third valve body and the signal input end of the fourth valve body respectively, and the control module is used for controlling the first valve body and the slurry circulation loop to be closed and the third valve body and the fourth valve body to be opened when the liquid outlet pressure of the first valve body is higher than the preset pressure.

5. The automatic slurry supply system according to claim 4, characterized in that, The system further comprises: A fifth valve body is arranged between the liquid outlet end of the first valve body and the liquid inlet end of the plurality of second valve bodies, the liquid inlet end of the fifth valve body is connected with the liquid outlet end of the first valve body, the liquid outlet end of the fifth valve body is connected with the liquid inlet end of the plurality of second valve bodies, and the detection end of the third detection module is arranged at the liquid outlet end of the fifth valve body. The signal output end of the control module is connected with the signal input end of the fifth valve body, and the control module is used for controlling the fifth valve body to be closed when the liquid outlet pressure of the first valve body is higher than the preset pressure.

6. The automatic slurry supply system according to claim 1, characterized by The system further comprises: A fourth detection module is arranged at the liquid outlet end of the first valve body, and the fourth detection module is used for detecting the liquid outlet flow of the first valve body. The signal input end of the control module is connected with the signal output end of the fourth detection module, and the control module is used for controlling the opening degree of the first valve body according to the liquid outlet flow of the first valve body.

7. The automatic slurry supply system according to claim 6, characterized in that The system further comprises: A sixth valve body, a seventh valve body and an eighth valve body. The liquid inlet end of the sixth valve body is connected with the liquid outlet end of the slurry pump, the liquid outlet end of the sixth valve body is connected with the liquid inlet end of the slurry tank, the liquid inlet end of the seventh valve body is connected with the pressure flushing water, the liquid outlet end of the seventh valve body is connected with the liquid inlet end of the sixth valve body, the liquid inlet end of the eighth valve body is connected with the liquid outlet end of the slurry tank, and the liquid outlet end of the eighth valve body is connected with the flushing water collecting device. The signal output end of the control module is connected with the signal input end of the sixth valve body, the signal input end of the seventh valve body and the signal input end of the eighth valve body respectively, and the control module is used for controlling the first valve body and the slurry pump to be closed and the sixth valve body, the seventh valve body and the eighth valve body to be opened when the liquid outlet flow of the first valve body is lower than the preset flow.

8. The automatic slurry supply system of claim 1, wherein The system further comprises: A fifth detection module is arranged in the slurry tank, and the fifth detection module is used for detecting the liquid level of the slurry tank. The signal input end of the control module is connected with the signal output end of the fifth detection module, and the control module is used for controlling the slurry pump and the first valve body to be closed when the liquid level of the slurry tank is lower than the preset liquid level.

9. The automatic slurry supply system of claim 1, wherein The system further comprises: A ninth valve body is arranged between the liquid outlet end of the first valve body and the liquid inlet end of the tower body of the absorption tower, the liquid inlet end of the ninth valve body is connected with the liquid outlet end of the first valve body, the liquid outlet end of the ninth valve body is connected with the liquid inlet end of the tower body, and the signal output end of the control module is connected with the signal input end of the ninth valve body.

10. A wet flue gas desulfurization apparatus characterized by comprising: The application further provides a system for automatically supplying slurry, comprising: The system for automatically supplying slurry further comprises an absorption tower. The absorption tower comprises a tower body and a slurry circulating loop, the liquid inlet end of the slurry circulating loop is connected with the liquid outlet end of the slurry pool at the bottom of the tower body, and the liquid outlet end of the slurry circulating loop is connected with the liquid inlet end of the spraying device at the top of the tower body.

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