Water quality detection equipment for flue gas water extraction in thermal power plant

Abstract

The application discloses a water quality detection equipment for flue gas water extraction of a thermal power plant, which comprises a flue gas water extraction detection mechanism installed in a water extraction condensing tower, a flow control valve I installed on a flue gas exhaust pipe communicated with the water extraction condensing tower and used for regulating opening or closing of the flue gas exhaust pipe, and a backflow pipe with one end communicated with the flue gas exhaust pipe and the other end communicated with a desulfurization absorption tower on a side close to a flue gas inlet, wherein a flow control valve II is installed on the backflow pipe and used for regulating opening or closing of the backflow pipe.

Description

Technical Field

[0001] This invention relates to the field of flue gas water extraction and testing technology, specifically to a water quality testing device for flue gas water extraction in thermal power plants. Background Technology

[0002] In the process of flue gas water extraction in thermal power plants, it is necessary to conduct timely quality analysis and testing of the extracted water to monitor the status of flue gas desulfurization. Currently, the water quality of flue gas extraction water is typically monitored by collecting the discharged water from the extraction condenser. However, this method is prone to the following problems: if the water is found to be substandard, a large amount of collected water will be substandard, requiring chemical treatment. However, due to the large volume of water collected from the condenser, this not only increases the consumption of chemicals but also makes chemical control more difficult, resulting in the flue gas extraction water not being used promptly, thus reducing the efficiency of water recycling. Furthermore, the timeliness and accuracy of flue gas extraction water quality testing are relatively low.

[0003] Therefore, it is necessary to provide a water quality testing device for flue gas extraction in thermal power plants to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a water quality testing device for flue gas extraction in thermal power plants, comprising:

[0005] The flue gas water extraction detection device is installed inside the water extraction and condensation tower;

[0006] Flow control valve one is installed on the flue pipe connected to the water lifting condenser tower and is used to regulate the opening or closing of the flue pipe;

[0007] The return pipe has one end connected to the flue gas pipe and the other end connected to the desulfurization absorption tower on the side facing the flue gas inlet. A flow control valve is installed on the return pipe to regulate the opening or closing of the return pipe.

[0008] Furthermore, the flue gas water extraction detection mechanism includes a hanging rod, the upper end of which is connected to the upper spray frame in the water extraction condensation tower, and the lower end of which is equipped with a vertical telescopic rod. The telescopic rod is fixedly fitted with a carrier plate 1 and a carrier plate 2 near its lower outer wall and lower output end, respectively. A radial slide is installed on the outer side of the carrier plate 1, and a radially sliding water collection detector is installed on the slide. One end of the water collection detector is hinged to a connecting rod, and the other end of the connecting rod is hinged to the carrier plate 2.

[0009] Furthermore, the water collection detector includes:

[0010] The slide block slides on the carriage and is used for hinged assembly with the connecting rod;

[0011] The detector is vertically fixed to the slide block, and its upper end is connected to a drainage tube. The drainage tube shell is provided with a through flow hole one. A retaining ring is fixed to the upper middle side of the drainage tube. A vertical telescopic rod three is installed on the lower ring surface of the retaining ring. A water collecting tube that slides vertically against the inner wall of the drainage tube is fixed to the lower output end of the telescopic rod three. The water collecting tube shell is provided with a flow hole two corresponding to the flow hole one. The water collecting tube is filled with a water-absorbing cotton body. A pressure plate plug that fits tightly against the inner wall of the water collecting tube is connected to the upper end of the water-absorbing cotton body. A discharge tube two is provided at the lower end of the water collecting tube, and a telescopic rod two is fixed to the upper end of the drainage tube. The lower output end of the telescopic rod two extends into the water collecting tube and connects to the pressure plate plug.

[0012] Furthermore, the detector includes:

[0013] The detection tube has an inlet tube installed at its upper end for sliding cooperation and communication with the outlet tube.

[0014] A collection tray is set at the bottom side inside the detection tube, and its lower end is connected to an outlet tube 1, which is equipped with a control valve.

[0015] The pH meter probe is installed at the top of the detection tube and placed in the collection tray.

[0016] Furthermore, a flow meter is installed on the inlet tube.

[0017] Furthermore, the drainage tube includes an integral structure with a cylindrical shell located at the bottom and a conical shell located at the top, and the flow holes are distributed on the side of the cylindrical shell.

[0018] Furthermore, the outer wall of the diversion cylinder is provided with multiple vertical diversion channels, and the flow holes are arranged on the diversion channels.

[0019] Furthermore, a flow channel is provided on one side of the conical shell of the diversion tube. The flow channel is arranged in a spiral direction and is used to connect the upper end channel of the adjacent diversion channel.

[0020] Furthermore, multiple carriages are arranged circumferentially along the carrier plate.

[0021] Compared with the prior art, the present invention provides a water quality testing device for flue gas extraction in thermal power plants, which has the following features:

[0022] Beneficial effects:

[0023] 1. In this invention, the flue gas water extraction detection mechanism is installed at a corresponding position inside the water extraction condensation tower, that is, below the spray frame in the water extraction condensation tower, so as to analyze and detect the water quality of the flue gas water extraction in real time and in a timely manner. With the setting of the return pipe, flow control valve one, and flow control valve two, it can not only avoid the discharge flue gas from being mixed with unqualified water, but also promptly grasp the water quality of the flue gas water extraction, so as to adjust the de-flow treatment of the flue gas in a timely manner, thereby restoring and ensuring the water quality of the flue gas water extraction.

[0024] 2. In this invention, the flue gas mist in the cross-sectional area of ​​the water extraction and condensation tower is collected by the specific structure of the flue gas water extraction and detection mechanism, thereby ensuring the uniformity and sufficiency of flue gas mist collection, so as to obtain more comprehensive detection data more efficiently. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the water quality testing equipment for flue gas water extraction according to the present invention;

[0026] Figure 2 This is a schematic diagram of the flue gas water extraction and detection mechanism of the present invention;

[0027] Figure 3 This is a schematic diagram of the water collection detector structure of the present invention;

[0028] Figure 4 This is a partial cross-sectional view of the water collection detector of the present invention. Figure 1 ;

[0029] Figure 5 This is a partial cross-sectional view of the water collection detector of the present invention. Figure 2 ;

[0030] Figure 6 This is a schematic cross-sectional view of the detector structure of the present invention;

[0031] In the diagram: 1. Desulfurization absorption tower; 2. Water lifting and condensation tower; 3. Flue gas water lifting detection mechanism; 4. Flue gas inlet; 5. Exhaust pipe; 6. Flow control valve one; 7. Return pipe; 8. Flow control valve two; 9. Water collection detector; 31. Hanging rod; 32. Telescopic rod one; 33. Carrier plate one; 34. Carrier plate two; 35. Slide frame; 36. Connecting rod; 91. Slide seat; 92. Detector; 93. Drainage cylinder; 94. Telescopic rod two; 95. Fixing ring; 9 6. Telescopic rod three; 97. Water collection cylinder; 98. Pressure plate plug; 99. Water-absorbing cotton body; 921. Detection cylinder; 922. Inlet pipe; 923. Flow meter; 924. Collection tray; 925. Outlet pipe one; 926. Control valve; 927. pH meter probe; 931. Column housing; 932. Conical housing; 933. Flow channel; 934. Drainage channel; 935. Flow hole one; 971. Outlet pipe two; 972. Flow hole two. Detailed Implementation

[0032] Reference Figure 1-6 This invention provides a technical solution: a water quality testing device for flue gas extraction in thermal power plants, comprising:

[0033] Flue gas water lifting detection mechanism 3 is installed inside the water lifting condensation tower 2;

[0034] The flow control valve 6 is installed on the flue pipe 5 connected to the water lifting condenser tower 2 and is used to regulate the opening or closing of the flue pipe 5.

[0035] The return pipe 7 has one end connected to the flue gas pipe 5 and the other end connected to the desulfurization absorption tower 1 located on the side of the flue gas inlet 4. A flow control valve 8 is installed on the return pipe 7 to regulate the opening or closing of the return pipe 7.

[0036] Specifically, flow control valve one is closed, and flow control valve two is opened. Flue gas flows into the desulfurization absorption tower through the flue gas inlet for treatment, then flows to the water lifting and condensing tower for further treatment, and finally flows back to the desulfurization absorption tower through the return pipe, forming a circulating flow. The flue gas water lifting and condensing tower's water quality is monitored by a flue gas water lifting and condensing tower to determine if it meets or exceeds the expected standards. If the water quality is deemed acceptable, flow control valve one is opened and flow control valve two is closed. At this point, the flue gas treated in the water lifting and condensing tower flows out through the exhaust pipe. If the water quality is deemed unacceptable, flow control valve one is closed and flow control valve two is opened, and feedback is sent to the desulfurization absorption tower to adjust its desulfurization treatment of the flue gas. Here, further explanation is needed. The key feature is that, since the flue gas after desulfurization is treated by the water extraction and condensation tower, the flue gas water extraction detection mechanism in this structure mainly collects and detects the mist falling in the water extraction and condensation tower to determine whether the water quality of the mist is qualified or meets the expected conditions. Since the mist will eventually form condensate, the water quality of the flue gas water extraction can be determined by detecting the water quality of the mist falling in the water extraction and condensation tower. In addition, during the mist collection process, water with extremely small molecular size (that is, water that has not been completely condensed and will flow with the flue gas to the exhaust pipe) can be collected effectively, making the water quality collection more comprehensive and the water quality analysis more accurate.

[0037] In this embodiment, the flue gas water extraction detection mechanism 3 includes a suspension rod 31, the upper end of which is connected to the upper spray frame in the water extraction condensation tower 2, and the lower end of which is equipped with a vertical telescopic rod 32. A carrier plate 33 and a carrier plate 34 are fixedly fitted onto the lower outer wall and lower output end of the telescopic rod 32, respectively. A radial slide 35 is installed on the outer side of the carrier plate 33, and a radially sliding water collection detector 9 is installed on the slide 35. One end of a connecting rod 36 is hinged to the water collection detector 9, and the other end of the connecting rod 36 is hinged to the carrier plate 34. Multiple slides 35 are arranged along the circumference of the carrier plate 33. Specifically, when the flue gas water extraction detection mechanism is running, the telescopic rod 1 extends downward and retracts upward, causing the carrier plate 2 to move downward and upward, thereby controlling the radial sliding of the water collection detector along the slide. This allows for the collection of flue gas mist in the cross-sectional area of ​​the water extraction condensation tower, ensuring the uniformity and sufficiency of flue gas mist collection, and enabling more efficient and comprehensive acquisition of detection data.

[0038] In this embodiment, the water collection detector 9 includes: a slide 91, which slides on the slide 35 and is used for hinged assembly with the connecting rod 36;

[0039] The detector 92 is vertically fixed to the slide block 91, and its upper end is connected to the drain tube 93. The drain tube 93 has a through flow hole 935 on its shell. A retaining ring 95 is fixed to the upper middle side of the drain tube 93. A vertical telescopic rod 96 is installed on the lower ring surface of the retaining ring 95. A water collecting tube 97 is fixed to the lower output end of the telescopic rod 96 and slides vertically against the inner wall of the drain tube 93. The water collecting tube 97 has a flow hole 972 corresponding to the flow hole 935 on its shell. The water collecting tube 97 is filled with an absorbent cotton body 99. The upper end of the absorbent cotton body 99 is connected to a pressure plate plug 98 that fits tightly against the inner wall of the water collecting tube 97. The lower end of the water collecting tube 97 is provided with an outlet tube 971. A telescopic rod 94 is fixed to the upper end of the drain tube 93. The lower output end of the telescopic rod 94 extends into the water collecting tube 97 and connects to the pressure plate plug 98.

[0040] The system utilizes telescopic rod three to adjust the upward or downward movement of the water collection cylinder, thereby aligning or misaligning flow hole two with flow hole one for connection or blockage. In other words, when aerosol collection is needed, telescopic rod three adjusts the upward movement of the water collection cylinder, and vice versa. Specifically, when aerosol collection is required, telescopic rod two adjusts the pressure plate plug to compress the absorbent cotton, reducing its height. Telescopic rod three then adjusts the upward movement of the water collection cylinder, aligning flow hole two with flow hole one for connection. The system then uses telescopic rod two... After the pressure plate plug is pulled up to the original height of the absorbent cotton body, the telescopic rod three adjusts the water collection cylinder to move down, causing the flow hole two and flow hole one to be misaligned and blocked, completing the first collection process of mist. During this process, the suction force generated by the upward movement of the pressure plate plug attracts external mist through flow hole two and flow hole one into the water collection cylinder, and the absorbent cotton body absorbs the moisture in the mist. Then, the extension of the telescopic rod two adjusts the pressure plate plug to compress the absorbent cotton body to the minimum height, and the absorbed moisture is discharged into the inlet pipe through outlet pipe two.

[0041] In this embodiment, the time T taken for a single mist collection process is equal to the time nt taken for the water collection detector to slide along the maximum unidirectional sliding length of the slide, where n is a positive integer, so that the collection of mist distributed in the water-lifting condensation tower is more uniform and comprehensive.

[0042] In this embodiment, the detector 92 includes: a detection cylinder 921, the upper end of which is equipped with an inlet tube 922 for sliding cooperation and communication with the outlet tube 971;

[0043] A collection tray 924 is located at the bottom of the detection tube 921, and its lower end is connected to an outlet pipe 925. A control valve 926 is installed on the outlet pipe 925 to discharge the water liquid that has been tested in the collection tray.

[0044] pH meter probe 927 is installed at the top of the detection tube 921 and placed in the collection tray 924 to detect and analyze the acidity and alkalinity of the water entering the collection tray.

[0045] In this embodiment, a flow meter 923 is installed on the inlet pipe 922 to measure the amount of water collected in the primary aerosol collection process. It can also calculate the volume capacity V of the adsorbed gas by the difference between the in-situ height and the minimum height of the absorbent sponge, thereby detecting and judging the amount of water contained in a unit volume capacity V.

[0046] In this embodiment, the drainage tube 93 includes an integral structure with a columnar shell 931 located at the bottom and a conical shell 932 located at the top. The flow holes 935 are distributed on the side of the columnar shell 931. The structure of the conical shell is conducive to improving the collection of water. That is, when the falling condensate falls on the surface of the conical shell, it will cause the condensate to flow along the surface of the columnar shell.

[0047] In this embodiment, the outer wall of the diversion cylinder 93 is provided with a plurality of vertical diversion channels 934, and the flow holes 935 are arranged on the diversion channels 934 to facilitate the collection of a certain amount of condensate.

[0048] In this embodiment, a crossflow channel 933 is also provided on one side of the conical shell 932 in the diversion tube 93. The crossflow channel 933 is arranged in a spiral direction and is used to connect the upper channel of the adjacent diversion channel 934, which is beneficial to improve the flow direction of condensate into the diversion channel.

[0049] In practice, the flue gas water extraction detection mechanism is installed at the corresponding position inside the water extraction condensation tower, specifically below the spray rack. Initially, control valve one is closed, control valve two is opened, and the flue gas water extraction detection mechanism is activated. Flue gas is introduced into the flue gas inlet and enters the desulfurization absorption tower for treatment, flowing to the water extraction condensation tower for water extraction. The flue gas water extraction detection mechanism collects and analyzes the mist and a certain amount of condensate. When the water quality is qualified, control valve one is opened and control valve two is closed. The flue gas water extraction detection mechanism continues to collect and analyze the mist and a certain amount of condensate in the water extraction condensation tower in real time, and determines whether the water quality is qualified. If qualified, control valve one remains open and control valve two remains closed. If unqualified, control valve one is closed, control valve two is opened, and feedback is sent to the desulfurization absorption tower to adjust the desulfurization treatment of the flue gas in a timely manner. This process continues until the water quality is determined to be qualified, at which point control valve one is opened again and control valve two is closed.

[0050] The above description is merely a preferred embodiment of the invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water quality detection device for flue gas water extraction of a thermal power plant, characterized in that, It includes: Flue gas water extraction detection mechanism (3) is installed in the water extraction condensing tower (2) inside; Flow control valve one (6) is installed on the flue gas exhaust pipe (5) communicated with the water extraction condensing tower (2), used for regulating the opening or closing of the flue gas exhaust pipe (5); The backflow pipe (7) is communicated with the flue gas exhaust pipe (5) at one end, and is communicated with the desulfurization absorption tower (1) on the side close to the flue gas inlet (4) at the other end, and the backflow pipe (7) is provided with flow control valve two (8) for regulating the opening or closing of the backflow pipe (7); The flue gas water extraction detection mechanism (3) includes a boom (31), the upper end of which is connected to the upper layer spraying frame in the water extraction condensing tower (2), and the lower end of which is provided with a vertical telescopic rod one (32), the lower end of which is fixedly sleeved with a load disc one (33) and a load disc two (34) respectively, the outer side of the load disc one (33) is provided with a radial sliding frame (35), the sliding frame (35) is provided with a water collection detector (9) which can slide radially, one end of the water collection detector (9) is hingedly connected with a connecting rod (36), and the other end of the connecting rod (36) is hingedly connected with the load disc two (34); The water collection detector (9) comprises: A sliding seat (91) which slides on the sliding frame (35) and is used for hingedly assembling with the connecting rod (36); A detector (92) which is vertically penetrated and fixed on the sliding seat (91), and the upper end of the detector (92) is communicated with a flow guide cylinder (93), the flow guide cylinder (93) is provided with a penetrating flow hole one (935) on the cylinder shell, a retaining ring (95) is fixed on the middle upper side in the flow guide cylinder (93), a vertical telescopic rod three (96) is installed on the lower ring surface of the retaining ring (95), a vertical water collection cylinder (97) which slides on the inner wall of the flow guide cylinder (93) is fixed on the lower output end of the telescopic rod three (96), the cylinder shell of the water collection cylinder (97) is provided with a flow hole two (972) corresponding to the flow hole one (935), the water collection cylinder (97) is filled with a water absorption cotton body (99), the upper end surface of the water absorption cotton body (99) is connected with a pressure disc plug (98) which is closely attached to the inner cylinder wall of the water collection cylinder (97), a discharge pipe two (971) is arranged at the lower cylinder end of the water collection cylinder (97), and the upper end of the flow guide cylinder (93) is fixedly provided with a telescopic rod two (94), and the lower output end of the telescopic rod two (94) extends into the water collection cylinder (97) and is connected with the pressure disc plug (98).

2. The water quality detection device for flue gas water extraction of a thermal power plant according to claim 1, characterized in that, The detector (92) comprises: A detection cylinder (921) which is provided with a guide pipe (922) which is used for slidingly matching and communicating with the discharge pipe two (971) and is installed on the upper end of the detection cylinder (921); A collection supporting cylinder (924) which is arranged at the inner bottom side of the detection cylinder (921) and is communicated with a discharge pipe one (925) at the lower end, and the discharge pipe one (925) is provided with a regulating valve (926); A PH meter probe (927) which is installed at the inner top of the detection cylinder (921) and is arranged in the collection supporting cylinder (924).

3. The water quality detection device for flue gas water extraction of a thermal power plant according to claim 2, characterized in that, The guide pipe (922) is provided with a flow meter (923).

4. The water quality detection device for flue gas water extraction of a thermal power plant according to claim 1, characterized in that, The flow guide cylinder (93) comprises a column cylinder body (931) located below and a cone cylinder body (932) located above in an integrated structure, and the flow hole one (935) is distributed on the side of the column cylinder body (931).

5. The water quality detection device for flue gas water extraction of a thermal power plant according to claim 4, characterized in that, The outer cylinder wall of the drainage cylinder (93) is provided with a plurality of vertical drainage channels (934), and the flow hole (935) is arranged on the drainage channel (934).

6. The water quality detection device for flue gas water extraction of a thermal power plant according to claim 5, characterized in that, The drainage cylinder (93) further comprises a series flow channel (933) arranged on one side of the conical shell (932), wherein the series flow channel (933) is arranged in a spiral direction and used for connecting the upper ends of adjacent drainage channels (934).

7. The water quality detection device for flue gas water extraction of a thermal power plant according to claim 1, characterized in that, A plurality of the sliding frames (35) are arranged along the circumferential direction of the loading disc (33).

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