Desulfurizing tower flue gas pretreatment device

Abstract

The utility model belongs to the technical field of flue gas desulfurization, and particularly relates to a flue gas pretreatment device of a desulfurization tower, which is arranged in a flue gas inlet pipeline of the desulfurization tower, a spraying layer and a demister are sequentially arranged in the flue gas inlet pipeline along the flow direction of flue gas, and a backwashing pipe is arranged between the spraying layer and the demister. The back washing pipe is connected with a washing spray head, the washing spray head is arranged towards the demister and is used for washing the demister, the spraying layer comprises a spraying pipeline and a plurality of first spray heads, the spraying pipeline is connected with the plurality of first spray heads arranged in the flue gas inlet pipeline, and the spraying pipeline is connected with a circulating pump. According to the utility model, the flue gas is subjected to water spraying treatment in the flue gas inlet pipeline, and the demister is arranged, so that the air speed is reduced, the flue gas pressure is stabilized, large particles in the flue gas are removed, the pressure of the desulfurization tower is relieved, and the desulfurization efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas desulfurization technology, specifically relating to a flue gas pretreatment device for a desulfurization tower. Background Technology

[0002] When desulfurization towers treat industrial waste gas, they desulfurize the flue gas through spraying, packing, and other methods. Currently, the wind speed at the flue gas inlet of desulfurization towers is relatively high, which leads to uneven distribution of flue gas entering the desulfurization tower, increases the pressure of the demister, affects the desulfurization efficiency, and the high flue gas temperature can easily cause damage to the desulfurization tower. Summary of the Invention

[0003] This invention addresses the problems of high wind speed at the flue gas inlet of existing desulfurization towers, which leads to uneven distribution of flue gas entering the tower, increases demister pressure, affects desulfurization efficiency, and causes high flue gas temperature that can damage the tower. The invention provides a flue gas pretreatment device for desulfurization towers. This device uses water spraying to treat the flue gas at the inlet pipe and incorporates a demister to reduce wind speed, stabilize flue gas pressure, remove large particulate matter from the flue gas, alleviate pressure on the desulfurization tower, and improve desulfurization efficiency.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A flue gas pretreatment device for a desulfurization tower is installed inside the flue gas inlet pipe of the desulfurization tower. A spray layer and a demister are sequentially arranged along the flue gas flow direction inside the flue gas inlet pipe. A backwash pipe is provided between the spray layer and the demister, and the backwash pipe is connected to a flushing nozzle. The flushing nozzle is positioned towards the demister for flushing the demister. The spray layer includes a spray pipe and first nozzles. The spray pipe is connected to multiple first nozzles arranged inside the flue gas inlet pipe and a circulation pump. The spray layer cools the flue gas, helps reduce wind speed in conjunction with the demister, and eliminates large particulate matter in the flue gas, thereby improving the desulfurization efficiency of the desulfurization tower.

[0006] Preferably, one end of the flue gas inlet pipe is connected to the desulfurization tower and the other end is connected to a ventilation pipe. The ventilation pipe is vertically arranged, and multiple spray layers are arranged vertically and vertically inside the ventilation pipe. The spray pipes of the spray layers are all connected to the outlet pipe of the circulating pump. The flue gas temperature is reduced by the cooperation of multiple spray layers, and the wind speed is reduced to a certain extent.

[0007] Preferably, a waste bin is fixedly installed below the flue gas inlet pipe. The upper side of the waste bin is connected to the flue gas inlet pipe and corresponds vertically to the spray layer. A filter screen is installed inside the waste bin. The upper side of the filter screen is lower than the flue gas inlet pipe. The sprayed water flows into the waste bin and passes through the filter screen to separate impurities.

[0008] Preferably, the inlet pipe of the circulating pump is connected to the bottom of the filter screen in the waste bin, and the water that separates impurities through the filter screen is used for circulating spraying.

[0009] Preferably, the waste bin has an installation hole on one side, and a sealing plate is slidably matched in the installation hole to block the installation hole. One end of the filter screen is connected to the sealing plate, and scrapers are respectively provided on the upper and lower sides of the other end. Each scraper is fixedly connected to the sealing plate with a connecting rod. Pulling the sealing plate will drive the scraper to scrape off the impurities on the filter screen.

[0010] Preferably, a handle is fixedly provided on one side of the sealing plate, and the handle is located outside the waste bin, so that the sealing plate can be pulled by the handle.

[0011] Preferably, the waste bin has strip grooves on both opposite side walls, and the filter screen is slidably matched and installed in the corresponding strip grooves on both opposite sides. The filter screen is slidably detachable for easy cleaning.

[0012] The beneficial effects of this utility model through the above technical solution are as follows:

[0013] 1. This utility model uses a spray layer and a demister installed in the flue gas inlet pipe. The water sprayed from the spray layer is used to spray and remove dust from the flue gas entering the desulfurization tower and cool it down. It also reduces the wind speed (flue gas velocity) to a certain extent. With the demister, large particulate matter in the flue gas can be eliminated to a certain extent, the pressure of the desulfurization tower can be reduced, and the desulfurization efficiency can be improved. At the same time, the demister can stabilize the flue gas pressure entering the desulfurization tower, eliminating the need for a gas distribution plate.

[0014] 2. This utility model uses a backwash pipe installed in the flue gas inlet pipe to flush the demister, thereby washing away particulate impurities and other contaminants attached to the demister.

[0015] 3. This utility model sets up a vertically arranged ventilation pipe and sets up multiple spray layers at intervals inside the ventilation pipe. On the one hand, it ensures the dust removal and cooling effect of the flue gas. On the other hand, the spray water falls and flows to the flue gas inlet pipe after fully contacting the flue gas, avoiding backflow.

[0016] 4. This utility model collects spray water and water after rinsing the demister by setting a waste bin below the flue gas inlet pipe. The collected water is then filtered to separate out large particles and recycled for reuse in the spray and backwash pipes.

[0017] 5. This utility model removes impurities attached to the filter screen by pulling the sealing plate, which in turn moves the scraper and scrapes them out of the waste bin for collection or discharge.

[0018] 6. This utility model uses a sliding filter screen plate. After the sealing plate and scraper are pulled out of the waste bin, the filter screen plate can be directly pulled out for cleaning, ensuring the filtration and separation effect of the filter screen plate and avoiding clogging.

[0019] 7. This utility model collects particulate matter and other impurities generated during the pretreatment process by setting up a waste bin, preventing them from entering the desulfurization tower. This avoids a large amount of particulate matter accumulating in the alkaline solution pool at the bottom of the desulfurization tower, extends the cycle of cleaning the bottom sediment of the desulfurization tower during shutdown, and further improves the desulfurization efficiency of the desulfurization tower. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the structure of the waste bin of this utility model. Figure 1 .

[0023] Figure 4 This is a schematic diagram of the structure of the waste bin of this utility model. Figure 2 .

[0024] Figure 5 This is a schematic diagram of the structure of the waste bin of this utility model. Figure 3 .

[0025] Figure 6 This is a schematic diagram of the structure of the waste bin of this utility model. Figure 4 .

[0026] Figure 7 This is a schematic diagram of the connection between the sealing plate and the scraper of this utility model.

[0027] The attached diagram is labeled as follows: 1 is the desulfurization tower, 2 is the flue gas inlet pipe, 3 is the spray layer, 4 is the demister, 5 is the backwash pipe, 6 is the circulating pump, 7 is the ventilation pipe, 8 is the waste bin, 9 is the filter screen, 10 is the sealing plate, 11 is the scraper, 12 is the connecting rod, 13 is the handle, and 14 is the strip groove. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0029] like Figure 1-2As shown, this embodiment provides a flue gas pretreatment device for a desulfurization tower, which is installed inside the flue gas inlet pipe 2 of the desulfurization tower 1. A spray layer 3 and a demister 4 are sequentially arranged inside the flue gas inlet pipe 2 along the flue gas flow direction. The spray layer 3 includes a spray pipe and first nozzles. The spray pipe is connected to multiple first nozzles arranged inside the flue gas inlet pipe. The spray pipe is connected to a circulation pump 6, which delivers water to the spray pipe and sprays it through the multiple first nozzles to treat the flue gas inside the flue gas inlet pipe 2. This effectively reduces the temperature of the flue gas entering the desulfurization tower 1 and decreases the flue gas flow rate. Simultaneously, in conjunction with the demister 4, it eliminates large particulate matter in the flue gas to a certain extent, reduces the pressure of the desulfurization tower, and improves desulfurization efficiency.

[0030] A backwash pipe 5 is provided between the spray layer 3 and the demister 4. The backwash pipe 5 is connected to the outlet pipe of the circulating pump 6 and is connected to a flushing nozzle. The flushing nozzle is set towards the demister 4 and is used to flush the demister 4. The water sprayed from the nozzle on the backwash pipe 5 flushes the demister 4, removing surface particles and impurities, and also flushing the droplets after the flue gas liquefaction, ensuring the effectiveness of the demister 4.

[0031] like Figure 2 As shown, one end of the flue gas inlet pipe 2 is connected to the desulfurization tower 1, and the other end is connected to the ventilation pipe 7. The ventilation pipe 7 is vertically arranged, and multiple spray layers 3 are arranged vertically and vertically inside the ventilation pipe 7. The spray pipes of the spray layers 3 are all connected to the outlet pipe of the circulating pump 6. The multiple spray layers 3 inside the ventilation pipe 7 first spray the flue gas to remove dust and cool it down, and then the sprayed water flows to the flue gas inlet pipe 2.

[0032] A waste bin 8 is fixedly installed below the flue gas inlet pipe 2. The upper side of the waste bin 8 is connected to the flue gas inlet pipe 2 and corresponds vertically to the spray layer 3 inside the flue gas inlet pipe 2. At the same time, the demister 4 corresponds vertically to the waste bin 8. Thus, the spray water in the flue gas inlet pipe 2 (including the spray water flowing from the ventilation pipe 7) and the water after rinsing the demister 4 both flow into the waste bin 8 for collection. A filter screen 9 is installed inside the waste bin 8. The upper side of the filter screen 9 is lower than the flue gas inlet pipe 2. The inlet pipe of the circulation pump 6 is connected to the lower part of the filter screen 9 inside the waste bin 8. After the water entering the waste bin 8 passes through the filter screen 9 to separate the particulate matter and impurities, it is pumped to the spray layer 3 and the backwash pipe 5 by the circulation pump 6.

[0033] like Figure 3-7As shown, a mounting hole is provided on one side of the waste bin 8. A sealing plate 10 is slidably fitted into the mounting hole to seal the mounting hole and prevent water leakage. One end of the filter screen plate 9 is abutted against the sealing plate 10, and scrapers 11 are respectively provided on the upper and lower sides of the other end. A connecting rod 12 is fixedly connected between each scraper 11 and the sealing plate 10. A handle 13 is fixedly provided on one side of the sealing plate 10. The handle 13 is located outside the waste bin 8. By pulling the handle 13, the sealing plate 10 is pulled out, so that the two scrapers 11 slide along the upper and lower sides of the filter screen plate 9 to scrape off particles and other impurities on the filter screen plate 9.

[0034] As one possible implementation, a collection box with an upper opening is fixedly installed on one side of the waste bin 8. The upper opening of the collection box corresponds vertically to the mounting hole, so that the particles and other impurities scraped by the scraper 11 fall into the collection box, avoiding them from scattering and being difficult to clean.

[0035] The waste bin 8 has two opposing side walls with strip grooves 14. The filter screen 9 is slidably matched and installed in the corresponding strip grooves 14 on both opposite sides. After a period of use, the sealing plate 10 and scraper 11 can be pulled out of the waste bin 8 by the handle 13. Then the filter screen 9 can be pulled out of the filter box 8 for cleaning to ensure the filtration and separation effect of the filter screen 9.

[0036] It should be noted that, as Figure 3-4 As shown, the mounting hole can be set on any side of the waste bin 8 except the top and bottom sides as needed. The specific setting position can be determined according to the actual production needs and does not affect the realization of the above-mentioned functions of this utility model.

[0037] During operation, the flue gas passes through the ventilation pipe 7 and the flue gas inlet pipe 2 for pretreatment before entering the desulfurization tower 1. In this process, the flue gas is first sprayed with water through multiple spray layers 3 set at intervals in the ventilation pipe 7 and the flue gas inlet pipe 2 to cool, remove dust, and slow down the flue gas. Then the flue gas reaches the demister 4, and through the cooperation of the spray layer 3 and the demister 4, large particulate matter in the flue gas is effectively removed, and the wind speed and temperature of the flue gas entering the desulfurization tower 1 are reduced, thus stabilizing the flue gas pressure.

[0038] The spray water generated during the pretreatment process and the flushing water sprayed from the backwash pipe 5 that washes the demister 4 flow into the waste bin 8 for collection and filtration. The filtered water is pumped to the spray layer 3 and backwash pipe 5 by the circulation pump 6 for reuse. By pulling the handle 13, the sealing plate 10 is pulled out, so that the two scrapers 11 slide along the upper and lower sides of the filter screen plate 9 to scrape off the particulate matter and other impurities on the filter screen plate 9. The scraped particulate matter and impurities fall into the collection bin. After a period of use, the sealing plate 10 and scrapers 11 are pulled out of the waste bin 8 by the handle 13. Then the filter screen plate 9 can be pulled out of the filter box 8 for cleaning to ensure the filtration and separation effect of the filter screen plate 9.

[0039] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A flue gas pretreatment device for a desulfurization tower, installed inside the flue gas inlet pipe (2) of a desulfurization tower (1), characterized in that, A spray layer (3) and a demister (4) are arranged sequentially along the flue gas inlet pipe (2). A backwash pipe (5) is arranged between the spray layer (3) and the demister (4). The backwash pipe (5) is connected to a flushing nozzle. The flushing nozzle is arranged facing the demister (4) and is used to flush the demister (4). The spray layer (3) includes a spray pipe and a first nozzle. The spray pipe is connected to multiple first nozzles arranged in the flue gas inlet pipe. The spray pipe is connected to a circulation pump (6).

2. The desulfurization tower flue gas pretreatment device according to claim 1, characterized in that, The flue gas inlet pipe (2) is connected to the desulfurization tower (1) at one end and to the ventilation pipe (7) at the other end. The ventilation pipe (7) is set vertically and multiple spray layers (3) are set at intervals inside the ventilation pipe (7). The spray pipes of the spray layers (3) are all connected to the outlet pipe of the circulating pump (6).

3. The desulfurization tower flue gas pretreatment device according to claim 1, characterized in that, A waste bin (8) is fixedly installed below the flue gas inlet pipe (2). The upper side of the waste bin (8) is connected to the flue gas inlet pipe (2) and corresponds to the spray layer (3) vertically. A filter screen (9) is installed inside the waste bin (8). The upper side of the filter screen (9) is lower than the flue gas inlet pipe (2).

4. The desulfurization tower flue gas pretreatment device according to claim 3, characterized in that, The inlet pipe of the circulating pump (6) is connected to the bottom of the filter screen (9) inside the waste bin (8).

5. The desulfurization tower flue gas pretreatment device according to claim 3, characterized in that, The waste bin (8) has an installation hole on one side. A sealing plate (10) is slidably matched in the installation hole. The sealing plate (10) blocks the installation hole. One end of the filter screen plate (9) is in contact with the sealing plate (10), and scrapers (11) are respectively provided on the upper and lower sides of the other end. Each scraper (11) is fixedly connected to the sealing plate (10) with a connecting rod (12).

6. The desulfurization tower flue gas pretreatment device according to claim 5, characterized in that, A handle (13) is fixedly provided on one side of the sealing plate (10), and the handle (13) is located outside the waste bin (8).

7. The desulfurization tower flue gas pretreatment device according to claim 5, characterized in that, The waste bin (8) has strip grooves (14) on both sides of its opposite sides, and the filter screen (9) is slidably matched and installed in the corresponding strip grooves (14) on both opposite sides.

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