Absorber demister flush water system and fossil fuel power plant

Abstract

The utility model discloses a kind of absorption tower demister flushing water system and thermal power equipment, it is related to flue gas desulfurization field, including multiple flushing water mother pipes, multiple nozzles are sequentially arranged along its extension mode and connected in each flushing water mother pipe, flushing water mother pipe passes through absorption tower side wall, flushing water mother pipe first end is provided with water inlet and located absorption tower outside, flushing water mother pipe end is connected with release pipe and located absorption tower inside, multiple flushing water mother pipes are oppositely arranged, so that multiple flushing water mother pipe first end is located at the two sides of absorption tower outside respectively. Make flushing water mother pipe oppositely arranged, adjust the layout mode of multiple flushing water mother pipe, improve from traditional one side water inlet to two side water inlet, adopt shorter, more mother pipe can be covered with equivalent size absorption tower internal space, effectively shorten flushing water mother pipe length, eliminate end pressure deficiency problem, effectively reduce along-path resistance loss, make flushing water pressure distribution of flushing water mother pipe first end and end more balanced, improve end flushing effect.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization, and in particular to a flushing water system for an absorber tower demister. Furthermore, this utility model also relates to a thermal power generation device including the aforementioned absorber tower demister flushing water system. Background Technology

[0002] Limestone wet flue gas desulfurization (FGD) systems in thermal power plants are currently the most widely used flue gas desulfurization technology. To ensure normal equipment operation, the internal components of the absorption tower need to be flushed. To conserve water, the demister flushing water in the desulfurization system typically uses the unit's circulating water as its source. This circulating water contains a large amount of suspended solids, colloidal particles, and salt, resulting in poor water quality. Currently, demister flushing water systems generally adopt a single-sided water supply and a closed-end main pipe arrangement. The flushing water enters from one side of the absorption tower and flows along the main pipe to each branch nozzle, with the end of the main pipe sealed by a blind flange. To prevent impurities from entering the nozzles, a filter screen is usually installed at the system inlet. However, due to the small particle size and high content of suspended solids in the circulating water, conventional filters are difficult to effectively intercept, and a large amount of fine impurities enter the flushing water main pipe.

[0003] In actual operation, these impurities gradually accumulate in the main pipe, especially in the area with lower flow velocity at the end of the main pipe. In the traditional single-sided water supply method for flushing water, the main pipe is long in the middle, resulting in uneven pressure distribution between the beginning and end of the flushing process. The low flushing water pressure at the end leads to poor nozzle flushing in this area, easily causing localized blockages. Simultaneously, the high ambient temperature inside the absorption tower causes the deposits to undergo chemical reactions under high temperatures, forming a hard scale layer that ultimately blocks the demister nozzles. When the nozzles are severely blocked, the demister cannot be effectively flushed, blade scaling worsens, leading to increased system resistance, decreased demister efficiency, and even unit load limiting or unplanned shutdowns. The long main pipe and uneven pressure distribution at the beginning and end of the flushing process, coupled with the low flushing water pressure at the end, result in poor nozzle flushing in this area, easily causing localized blockages.

[0004] Furthermore, the end of the main pipe is sealed with a blind flange. Over long-term operation, the sludge deposited inside cannot be discharged, gradually accumulating and forming scale, eventually clogging the nozzles. The welded joints where the main pipe penetrates the tower wall to connect to the drain pipe are prone to cracking. The main pipe is relatively thick with limited flexibility, and the welded fixing points at the tower wall penetration point are easily damaged by expansion and shaking during the absorption tower's operation, causing leaks of flue gas. Once the main pipe or nozzles become clogged, the system must be shut down for cleaning, resulting in short maintenance cycles, high costs, and impacting the reliability of system operation.

[0005] Therefore, how to provide a flushing water system for an absorber demister with uniform water pressure and to avoid clogging is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a flushing water system for an absorber demister, which arranges the flushing water headers in a relatively symmetrical manner, effectively shortening the length of the flushing water headers and eliminating the problem of insufficient pressure at the end. Another purpose of this invention is to provide a thermal power generation device that includes the above-mentioned absorber demister flushing water system.

[0007] To solve the above-mentioned technical problems, this utility model provides a flushing water system for an absorber demister, including multiple flushing water headers. Each flushing water header is connected to multiple nozzles arranged sequentially along its extension. The flushing water header passes through the side wall of the absorber. The first end of the flushing water header is provided with a water inlet located outside the absorber. The second end of the flushing water header is connected to a drain pipe located inside the absorber. The multiple flushing water headers are arranged opposite each other, so that the first ends of the multiple flushing water headers are respectively located on both sides outside the absorber.

[0008] Preferably, the plurality of flushing water headers are arranged horizontally, and the extension direction of each flushing water header is perpendicular to the same positioning vertical plane, which is a vertical plane passing through a diameter of the cross-section of the absorption tower.

[0009] Preferably, a plurality of the flushing water headers are symmetrically arranged on both sides of the positioning vertical plane, with the ends of two opposite flushing water headers close to each other and located on both sides of the positioning vertical plane.

[0010] Preferably, multiple flushing water headers are arranged in the same cross-section of the absorption tower, and each flushing water header is evenly distributed along the positioning vertical plane.

[0011] Preferably, the flushing water headers near both ends of the positioning vertical surface pass through the positioning vertical surface, and the first ends of the flushing water headers near both ends of the positioning vertical surface are located on the same side outside the absorption tower.

[0012] Preferably, each of the flushing water headers is connected to a drain pipe at its end, and each drain pipe is equipped with a control valve that controls its conduction state. The drain pipe passes through the side wall of the absorption tower, and each control valve is located outside the absorption tower.

[0013] Preferably, a sensor is installed inside the discharge pipe, and the controller controls the opening and closing of each control valve according to the detection structure of the sensor.

[0014] Preferably, all of the discharge pipes are connected to the main sewage pipe, which is connected to the slurry tank of the absorption tower.

[0015] Preferably, the main sewage pipe is provided with an observation window.

[0016] This utility model provides a thermal power generation device, including the absorption tower demister flushing water system as described in any one of the above.

[0017] This utility model provides a flushing water system for an absorber demister, including multiple flushing water headers. Each flushing water header is connected to multiple nozzles arranged sequentially along its extension. The flushing water headers pass through the side wall of the absorber. The first end of the flushing water header is provided with a water inlet located outside the absorber. The second end of the flushing water header is connected to a drain pipe located inside the absorber. The multiple flushing water headers are arranged opposite each other, so that the first ends of the multiple flushing water headers are respectively located on both sides outside the absorber.

[0018] By arranging the flushing water headers in a relatively opposite manner and adjusting the layout of multiple flushing water headers from the traditional one-side water inlet to two-side water inlet, shorter and more numerous headers can fill the internal space of the absorption tower of the same size. This effectively shortens the length of the flushing water headers, eliminates the problem of insufficient pressure at the end, effectively reduces friction loss, and makes the flushing water pressure distribution at the beginning and end of the flushing water headers more balanced, thus improving the end flushing effect. Furthermore, by installing a drain pipe, the sediment in the flushing water headers can be actively discharged, preventing sludge accumulation and scale blockage at the source.

[0019] This utility model also provides a thermal power generation device including the above-mentioned absorption tower demister flushing water system. Since the above-mentioned absorption tower demister flushing water system has the above-mentioned technical effects, the above-mentioned thermal power generation device should also have the same technical effects, which will not be described in detail here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a specific embodiment of the absorber demister flushing water system provided by this utility model.

[0021] Among them, 1-flushing water main pipe; 2-absorption tower side wall; 3-water inlet; 4-drain pipe; 5-positioning vertical surface; 6-sewage main pipe; 7-observation window. Detailed Implementation

[0022] The core of this invention is to provide a flushing water system for an absorber demister, which arranges the flushing water headers in a relatively symmetrical manner, effectively shortening the length of the flushing water headers and eliminating the problem of insufficient pressure at the end. Another core aspect of this invention is to provide a thermal power generation device that includes the aforementioned absorber demister flushing water system.

[0023] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a specific embodiment of the absorber demister flushing water system provided by this utility model.

[0025] This utility model provides a flushing water system for an absorber demister, comprising multiple flushing water headers 1, each header 1 connected to multiple nozzles arranged sequentially along its extension. An inlet 3 is located at the beginning of each flushing water header 1, and a drain pipe 4 is connected to the end of each header 1. When flushing is required, clean water enters through the inlet 3 at the beginning of the flushing water header 1 and sequentially enters each nozzle along the extension direction of the flushing water header 1 to flush the demister. The water flow direction in the flushing water header 1 is from the beginning to the end. When wastewater needs to be discharged, the wastewater in the flushing water header 1 is discharged through the drain pipe 4. During installation, the flushing water header 1 passes through the side wall 2 of the absorber tower. The inlet 3 at the beginning of the flushing water header 1 is located outside the absorber tower, and the end of the flushing water header 1 is located inside the absorber tower. The multiple flushing water headers 1 are arranged opposite each other, with their beginnings located on opposite sides of the outside of the absorber tower.

[0026] By arranging the flushing water headers 1 in a relatively opposite manner and adjusting the layout of multiple flushing water headers 1, the traditional one-side water inlet is improved to two-side water inlet. Shorter and more numerous headers can fill the internal space of the absorption tower of the same size, effectively shortening the length of the flushing water headers 1, eliminating the problem of insufficient pressure at the end, effectively reducing friction loss, and making the flushing water pressure distribution at the beginning and end of the flushing water headers 1 more balanced, thus improving the end flushing effect. Furthermore, by installing a drain pipe 4, the sediment in the flushing water headers 1 is actively discharged, preventing sludge accumulation and scaling blockage from the source.

[0027] In the demister flushing water system of the absorption tower provided in a specific embodiment of this utility model, a virtual positioning vertical surface 5 is provided inside the absorption tower to facilitate the positioning of each flushing water header 1. The positioning vertical surface 5 does not have a real physical structure, but is a virtual plane derived from geometric principles. Specifically, the cross-section of the absorption tower is a circular plane. A specific diameter of the absorption tower's cross-section is selected, and a vertical plane can be determined based on this diameter; that is, the positioning vertical surface 5 is a vertical plane passing through a diameter in the cross-section of the absorption tower. Multiple flushing water headers 1 are arranged horizontally, and the extension direction of each flushing water header 1 is perpendicular to the same positioning vertical surface 5.

[0028] Specifically, multiple flushing water headers 1 are symmetrically arranged on both sides of the positioning vertical plane 5. The ends of two opposite flushing water headers 1 are close to each other and located on both sides of the positioning vertical plane 5, and the two opposite flushing water headers 1 are arranged coaxially. Compared with the traditional layout, this is equivalent to splitting the original single header that runs through the absorption tower in two, shortening the length of each header to half of its original length, and changing the traditional single-sided water supply to a double-sided symmetrical water supply, effectively reducing friction loss. Preferably, the multiple flushing water headers 1 are arranged in the same cross-section of the absorption tower, and each flushing water header 1 is evenly distributed along the positioning vertical plane 5.

[0029] In addition, the flushing water headers 1 near both ends of the positioning vertical surface 5 are relatively short and do not need to be split in two. They pass directly through the positioning vertical surface 5, and the beginnings of the flushing water headers 1 near both ends of the positioning vertical surface 5 are located on the same side outside the absorption tower, still using the traditional single-sided water supply method. The original long header is changed to two headers with water entering from both ends, while the shorter headers near both ends still enter from one end. This ensures that the length of each flushing water header 1 is basically the same, which means that the number of nozzles connected to each flushing water header 1 is basically the same, the water volume distributed by the nozzles is basically the same, and the flushing effect is uniform.

[0030] In another specific embodiment of the present invention, in the rinsing water system of the absorber demister, two virtual positioning vertical surfaces 5 are provided inside the absorber to facilitate the positioning of each rinsing water header 1. These positioning vertical surfaces 5 do not have a real physical structure but are virtual planes derived from geometric principles. Specifically, the cross-section of the absorber is a circular plane. Two specific diameters of the absorber's cross-section are selected, and these two diameters are perpendicular to each other. Based on these two diameters, two vertical planes can be determined. That is, the positioning vertical surfaces 5 are vertical planes passing through the two perpendicular diameters of the absorber's cross-section, and the two positioning vertical surfaces 5 are perpendicular to each other. Multiple rinsing water headers 1 are arranged horizontally and divided into two groups. The extension direction of one group of rinsing water headers 1 is perpendicular to one positioning vertical surface 5, and the extension direction of the other group of rinsing water headers 1 is perpendicular to the other positioning vertical surface 5.

[0031] Specifically, multiple flushing water headers 1 of the same group are symmetrically arranged on both sides of a positioning vertical plane 5, and multiple flushing water headers 1 of another group are symmetrically arranged on both sides of another positioning vertical plane 5. One group of flushing water headers 1 is positioned above the other group of flushing water headers 1. The two groups of flushing water headers 1 are arranged vertically and alternately. Multiple inlets 3 are arranged around the absorption tower on multiple sides, meaning that inlets 3 are provided in all directions outside the absorption tower sidewall 2. The ends of two opposing flushing water headers 1 are close to each other and located on both sides of the positioning vertical plane 5, and the two opposing flushing water headers 1 are arranged coaxially. Compared to the traditional layout, this is equivalent to splitting the original single header that runs through the absorption tower in two, shortening the length of each header to half its original length, and changing the traditional single-sided water supply to a double-sided symmetrical water supply arrangement, effectively reducing friction loss. Preferably, the two groups of flushing water headers 1 are located on the cross-sections of the two absorption towers, and each flushing water header 1 is evenly distributed along the positioning vertical plane 5.

[0032] In addition, the flushing water headers 1 near both ends of the positioning vertical surface 5 are relatively short and do not need to be split in two. They pass directly through the positioning vertical surface 5, and the beginnings of the flushing water headers 1 near both ends of the positioning vertical surface 5 are located on the same side outside the absorption tower, still using the traditional single-sided water supply method. The original long header is changed to two headers with water entering from both ends, while the shorter headers near both ends still enter from one end. This ensures that the length of each flushing water header 1 is basically the same, which means that the number of nozzles connected to each flushing water header 1 is basically the same, the water volume distributed by the nozzles is basically the same, and the flushing effect is uniform.

[0033] In another specific embodiment of the present invention, the flushing water system for the absorber demister includes a horizontally arranged annular pipe and a radial pipe. Furthermore, the number of nozzles connected to each flushing water main pipe 1 is kept to be substantially consistent, the water volume distributed to each nozzle is substantially consistent, and the flushing effect is uniform.

[0034] Based on the absorption tower demister flushing water system provided in the above specific embodiments, each flushing water header 1 is connected to a drain pipe 4 at its end. Each drain pipe 4 is equipped with a control valve that individually controls its conduction state. The drain pipe 4 passes through the side wall 2 of the absorption tower, and each control valve is located outside the absorption tower. During normal system operation, the control valves remain closed, and the flushing water system flushes the demister in a conventional manner to avoid a drop in flushing pressure due to discharge. When operators determine that a certain flushing water header 1 has a risk of deposition or a decrease in flushing effect, the corresponding control valve can be opened periodically or as needed to discharge the deposits in the flushing water header 1 with the drain water, effectively preventing impurities from accumulating and forming scale at the end of the flushing water header 1.

[0035] The venting operation can be completed independently outside the tower without shutdown, resulting in low maintenance costs and significantly improved system reliability. Only the venting pipe 4 and valve are added to the original system, without changing the existing flushing logic. It is suitable for new construction and renovation projects. The venting valve is closed during normal operation, without causing flushing pressure loss. The system operation mode is flexible and controllable.

[0036] The control valves can be manual, controlled by the operator's observation and experience, or electric or gas-liquid control valves for automated discharge. Sensors, such as differential pressure sensors and concentration sensors, or timers, can be installed in the discharge pipe 4. The controller controls the opening and closing of each control valve based on the sensor's detection structure. Timed discharge or automatic differential pressure discharge logic can be set in conjunction with the flushing cycle.

[0037] All discharge pipes 4 are connected to a main sewage header 6, which in turn connects to the slurry tank of the absorption tower and ultimately returns to the slurry tank. The discharged water returns directly to the slurry system without additional treatment, avoiding excessively long pipelines and system complexity. Alternatively, the discharged water can be discharged into a ditch or recycling tank depending on site conditions. Preferably, the sewage header 6 is equipped with an observation window 7 to monitor the discharge process.

[0038] In addition, this solution uses a 20mm pipe as a sewage discharge pipe that penetrates the tower wall. The 20mm pipe has a certain degree of deflection and can absorb the effects of tower shaking and expansion during operation. The discharge pipe 4 can be a pipe with a diameter of 57mm or other specifications such as 76mm, all of which are within the protection scope of this utility model.

[0039] In addition to the above-mentioned absorption tower demister flushing water system, the specific embodiment of this utility model also provides a thermal power generation device including the above-mentioned absorption tower demister flushing water system. For the structure of other parts of the thermal power generation device, please refer to the prior art, which will not be repeated here.

[0040] The above provides a detailed description of the absorption tower demister flushing water system and thermal power generation equipment provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A flushing water system for an absorber demister, comprising a plurality of flushing water headers (1), each of the flushing water headers (1) being connected to a plurality of nozzles arranged sequentially along its extension, characterized in that, The flushing water pipe (1) passes through the side wall (2) of the absorption tower. The flushing water pipe (1) has an inlet (3) at its head and is located outside the absorption tower. The flushing water pipe (1) is connected to a drain pipe (4) at its end and is located inside the absorption tower. Multiple flushing water pipes (1) are arranged opposite to each other, so that the heads of multiple flushing water pipes (1) are located on both sides outside the absorption tower.

2. The absorption tower demister flushing water system according to claim 1, characterized in that, Multiple flushing water headers (1) are arranged horizontally, and the extension direction of each flushing water header (1) is perpendicular to the same positioning vertical plane (5), which is a vertical plane with a diameter passing through the cross-section of the absorption tower.

3. The absorber demister flushing water system according to claim 2, characterized in that, Multiple flushing water pipes (1) are symmetrically arranged on both sides of the positioning vertical surface (5), with the ends of two opposite flushing water pipes (1) close to each other and located on both sides of the positioning vertical surface (5).

4. The absorber demister flushing water system according to claim 3, characterized in that, Multiple flushing water headers (1) are arranged in the same cross section of the absorption tower, and each flushing water header (1) is evenly distributed along the positioning vertical plane (5).

5. The absorber demister flushing water system according to claim 4, characterized in that, The flushing water pipes (1) near both ends of the positioning vertical surface (5) pass through the positioning vertical surface (5), and the first ends of the flushing water pipes (1) near both ends of the positioning vertical surface (5) are located on the same side outside the absorption tower.

6. The absorber demister flushing water system according to any one of claims 1 to 5, characterized in that, Each of the flushing water pipes (1) is connected to a drain pipe (4) at its end. Each drain pipe (4) is equipped with a control valve that controls the conduction state. The drain pipe (4) passes through the side wall (2) of the absorption tower, and each control valve is located outside the absorption tower.

7. The absorber demister flushing water system according to claim 6, characterized in that, A sensor is installed inside the discharge pipe (4), and the controller controls the opening and closing of each control valve according to the detection structure of the sensor.

8. The absorber demister flushing water system according to claim 7, characterized in that, All of the discharge pipes (4) are connected to the main sewage pipe (6), which is connected to the slurry pool of the absorption tower.

9. The absorber demister flushing water system according to claim 8, characterized in that, The main sewage pipe (6) is equipped with an observation window (7).

10. A thermal power generation device, characterized in that, Includes the absorber demister flushing water system as described in any one of claims 1 to 9.

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