Biomass boiler flue gas treatment device

Abstract

The utility model relates to the technical field of boilers, in particular to a biomass boiler flue gas treatment device which comprises a shell, one to three spraying discs and at least one gas distribution disc are arranged in the shell, the spraying discs comprise the first spraying disc, the second spraying disc and the third spraying disc, a flue gas inlet and a flue gas outlet are formed in the outer portion of the shell, and the gas distribution disc is arranged in the shell. The smoke inlet is formed in the side wall close to the bottom of the shell, and the smoke outlet is located in the top of the shell. According to the biomass boiler flue gas treatment device, the particulate matters and sulfur dioxide in the biomass boiler flue gas are efficiently removed through an elaborately designed structure and a technological process. According to the device, particulate matters in flue gas are effectively removed under the combined action of spraying and the dust removal chamber, and sulfur dioxide in the flue gas is further removed under the synergistic action of multi-stage spraying and the gas distribution disc. And the content of particulate matters and sulfur dioxide in the treated flue gas is obviously reduced, so that the requirements of atmospheric emission standards can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, and more specifically, to a flue gas treatment device for a biomass boiler. Background Technique

[0002] In today's industrial production and life, as the main heat supply equipment, the high-temperature flue gas generated during the combustion of biomass boilers contains a large amount of dust particles and sulfur dioxide. These pollutants pose a serious threat to the environment on which humans depend for survival. Sulfur dioxide is one of the main causes of air pollution. Its large-scale emission not only leads to acid rain pollution but also exacerbates the haze phenomenon, seriously affecting people's health. At the same time, the particulate matter in the flue gas is also an important indicator of air pollution, and its excessive emission also has an adverse impact on human health and the environment.

[0003] In the existing biomass boilers, the emissions of particulate matter and sulfur dioxide in the flue gas are relatively large. Generally, they are simply treated and then discharged, causing great environmental pollution, which has become an urgent task in today's atmospheric environment governance. Content of the Utility Model

[0004] The purpose of the utility model is to provide a flue gas treatment device for a biomass boiler to solve the problem that in the existing biomass boilers, the emissions of particulate matter and sulfur dioxide in the flue gas are relatively large, and generally, they are simply treated and then discharged, causing great environmental pollution as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides a flue gas treatment device for a biomass boiler, which includes a shell. One to three spray trays and at least one air distribution tray are arranged in the shell. The spray trays include a first spray tray, a second spray tray, and a third spray tray. An inlet flue and an outlet flue are arranged outside the shell. The inlet flue is arranged on the side wall close to the bottom of the shell, and the outlet flue is located at the top of the shell. The inlet flue is located between the first spray tray and the overflow port and on one side of the dust removal chamber. A vertical intermediate partition is installed at the bottom inside the shell, and an inclined plate is installed at the top of the intermediate partition. The intermediate partition, the inclined plate, and the inner wall of the shell jointly enclose a dust removal chamber. An air outlet is opened at the upper position of the intermediate partition, and an overflow port is opened at the middle position of the intermediate partition. The first spray tray is arranged in the dust removal chamber and is located between the air outlet and the overflow port.

[0006] Preferably, the end of the inlet flue close to the shell is narrowed to increase the impact probability of the particulate matter in the flue gas on the inner wall of the dust removal chamber, thereby effectively removing the particulate matter in the flue gas. One end of the inlet flue is tangent to the outer wall of the shell, so that the flue gas enters along the inner wall of the body, further increasing the impact probability of the particulate matter in the flue gas on the inner wall of the dust removal chamber, and thus improving the removal efficiency of the particulate matter in the flue gas.

[0007] Preferably, a demister is provided at a position of the housing close to the smoke outlet for removing the droplets entrained after the flue gas is purified.

[0008] Preferably, a spray pipe is installed on an outer wall of one side of the housing. The spray pipe includes a circulation pump and a circulation pipeline. A liquid storage chamber is formed between an inner wall of the housing and the intermediate partition. An inlet of the circulation pipeline is connected to the liquid storage chamber, and an outlet of the circulation pipeline is connected to different spray trays through different pipelines. The spray liquid stored in the liquid storage chamber is sodium hydroxide solution, calcium hydroxide solution, magnesium hydroxide solution or ammonia water solution.

[0009] Preferably, a liquid replenishing pipe, a first liquid discharging pipe and a second liquid discharging pipe are provided on a side wall of the housing. The liquid replenishing pipe and the second liquid discharging pipe are located on one side of the liquid storage chamber, and the first liquid discharging pipe is located on one side of the dust removal chamber.

[0010] Preferably, the first spray tray is semicircular, including a first spray main pipe and a plurality of first spray branch pipes connected to the first spray main pipe. A plurality of first spray heads are installed on the first spray branch pipes, and the first spray branch pipes are connected to the circulation pipeline.

[0011] Preferably, the second spray tray has the same structure as the third spray tray. The second spray tray is circular, including a second spray main pipe and a plurality of second spray branch pipes connected to the second spray main pipe. A plurality of second spray heads are installed on the second spray branch pipes, and the second spray main pipe is connected to the circulation pipeline.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In the biomass boiler flue gas treatment device, through the carefully designed structure and process flow, the efficient removal of particulate matter and sulfur dioxide in the biomass boiler flue gas is realized.

[0014] Specifically, the device utilizes the combined action of spraying and the dust removal chamber to effectively remove particulate matter in the flue gas, and through the synergistic action of multi-stage spraying and the air distribution tray, further removes sulfur dioxide in the flue gas. In the treated flue gas, the contents of particulate matter and sulfur dioxide are significantly reduced, and can meet the requirements of the atmospheric emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0016] Figure 2 is of the present utility model Figure 1 a schematic cross-sectional structure diagram taken along A-A in;

[0017] Figure 3Schematic structural diagram of the first spray tray in the present utility model;

[0018] Figure 4 Schematic structural diagram of the second spray tray in the present utility model;

[0019] The meanings of the various reference numerals in the figure are as follows:

[0020] 1. Housing; 11. Smoke inlet; 12. Smoke outlet; 13. Circulation pipeline; 131. Circulation pump; 2. Spray tray; 21. First spray tray; 211. First main spray pipe; 212. First spray branch pipe; 213. First spray head; 22. Second spray tray; 221. Second main spray pipe; 222. Second spray branch pipe; 223. Second spray head; 23. Third spray tray; 3. Air distribution tray; 4. Intermediate partition; 41. Air outlet; 42. Overflow port; 5. Inclined plate; 6. Dust removal chamber; 61. First drain pipe; 7. Liquid storage chamber; 71. Second drain pipe; 72. Liquid replenishing pipe; 8. Demister. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] The present utility model provides a flue gas treatment device for a biomass boiler, as Figures 1 - 4As shown in the figure, it includes a housing 1. Inside the housing 1, there are one to three spray trays 2 and at least one gas distribution tray 3. The spray tray 2 includes a first spray tray 21, a second spray tray 22, and a third spray tray 23. An inlet flue 11 and an outlet flue 12 are arranged outside the housing 1. The inlet flue 11 is arranged on the side wall near the bottom of the housing 1, and the outlet flue 12 is located at the top of the housing 1. The inlet flue 11 is located between the first spray tray 21 and the overflow port 42, and is on the side of the dust removal chamber 6. A vertical intermediate partition 4 is installed at the bottom inside the housing 1, and an inclined plate 5 is installed at the top of the intermediate partition 4; the intermediate partition 4, the inclined plate 5, and the inner wall of the housing 1 together enclose a dust removal chamber 6. An air outlet 41 is opened at the upper position of the intermediate partition 4, and an overflow port 42 is opened at the middle position of the intermediate partition 4. The first spray tray 21 is arranged inside the dust removal chamber 6, and the first spray tray 21 is located between the air outlet 41 and the overflow port 42. Through the carefully designed structural layout, the efficient treatment of the flue gas of the biomass boiler is realized. Specifically, the device uses the spray trays and gas distribution trays inside the housing to perform multi-stage spraying and gas distribution treatment on the incoming flue gas, effectively removing pollutants such as particulate matter and sulfur dioxide in the flue gas. At the same time, through the arranged dust removal chamber, the removal effect of particulate matter is further enhanced. This structural design enables the flue gas to be fully purified and treated inside the device, thereby significantly improving the emission quality of the flue gas and reducing environmental pollution. In addition, the device also has the advantages of compact structure, stable operation, and simple operation, providing a new solution for the effective treatment of the flue gas of the biomass boiler.

[0023] In this embodiment, the end of the inlet flue 11 close to the housing 1 is narrowed to increase the impact probability of the particulate matter in the flue gas with the inner wall of the dust removal chamber, thereby realizing the effective removal of the particulate matter in the flue gas. One end of the inlet flue 11 is tangentially arranged with the outer wall of the housing 1 so that the incoming flue gas moves along the inner wall of the body, further increasing the impact probability of the particulate matter in the flue gas with the inner wall of the dust removal chamber 6, and thus improving the removal efficiency of the particulate matter in the flue gas.

[0024] Specifically, a demister 8 is arranged at the position of the housing 1 close to the outlet flue 12 for removing the droplets entrained after the flue gas is purified.

[0025] Furthermore, a spray pipe is installed on one side outer wall of the housing 1. The spray pipe includes a circulation pump 131 and a circulation pipeline 13. A liquid storage chamber 7 is formed between the inner wall of the housing 1 and the intermediate partition 4. The inlet of the circulation pipeline 13 is connected to the liquid storage chamber 7, and the outlet of the circulation pipeline 13 is connected to different spray trays 2 through different pipelines; the spray liquid stored in the liquid storage chamber 7 is sodium hydroxide solution, calcium hydroxide solution, magnesium hydroxide solution, or ammonia water solution.

[0026] Further, a liquid replenishing pipe 72, a first drain pipe 61 and a second drain pipe 71 are provided on the side wall of the housing 1; the liquid replenishing pipe 72 and the second drain pipe 71 are located on one side of the liquid storage chamber 7 for replenishing and draining the liquid storage chamber 7, and the first drain pipe 61 is located on one side of the dust removal chamber 6 for draining the dust removal chamber 6.

[0027] Further, the first spray tray 21 is semi-circular, including a first spray main pipe 211 and a plurality of first spray branch pipes 212 connected to the first spray main pipe 211. A plurality of first spray heads 213 are installed on the first spray branch pipes 212, and the first spray branch pipes 212 are connected to the circulation pipeline 13 to facilitate a uniform spraying effect.

[0028] Further, the second spray tray 22 has the same structure as the third spray tray 23. The second spray tray 22 is circular, including a second spray main pipe 221 and a plurality of second spray branch pipes 222 connected to the second spray main pipe 221. A plurality of second spray heads 223 are installed on the second spray branch pipes 222, and the second spray main pipe 221 is connected to the circulation pipeline 13.

[0029] When the biomass boiler flue gas treatment device of the present utility model is in use, first, when the flue gas generated by the biomass boiler enters the housing 1 through the flue gas inlet 11, the flow path of the flue gas is carefully designed to improve the treatment efficiency. One end of the flue gas inlet 11 is narrowed and tangent to the outer wall of the housing 1. This design enables the flue gas to move along the inner wall of the housing when entering, increasing the impact probability of the particulate matter in the flue gas with the inner wall of the dust removal chamber 6, which helps the preliminary removal of the particulate matter.

[0030] Subsequently, the flue gas enters the dust removal chamber 6, where the first spray tray 21 sprays and treats the flue gas. The spray liquid (such as sodium hydroxide solution, calcium hydroxide solution, etc.) is transported from the liquid storage chamber 7 to the first spray tray 21 through the circulation pump 131 and the circulation pipeline 13, and is evenly sprayed into the flue gas through the spray heads, and chemically reacts with pollutants such as particulate matter and sulfur dioxide in the flue gas to convert them into forms that are easy to remove.

[0031] After being treated in the dust removal chamber 6, pollutants such as particulate matter and sulfur dioxide in the flue gas are effectively removed. Then, the flue gas leaves the dust removal chamber 6 through the air outlet 41 and continues to flow upward. In this process, if the second spray tray 22 and the third spray tray 23 are provided in the device, they will further spray and treat the flue gas to ensure the full purification and treatment of the flue gas.

[0032] Finally, the purified flue gas passes through the demister 8 to remove the entrained droplets, and then is discharged from the device through the flue gas outlet 12. The setting of the demister 8 effectively prevents the entrained droplets in the purified flue gas from causing secondary pollution to the environment.

[0033] During the whole working process, the spraying liquid in the liquid storage chamber 7 is replenished through the liquid replenishing pipe 72 to ensure the continuous progress of the spraying treatment. Meanwhile, the waste liquids in the dust removal chamber 6 and the liquid storage chamber 7 are respectively discharged from the device through the first liquid discharge pipe 61 and the second liquid discharge pipe 71 for subsequent treatment or recovery.

[0034] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A flue gas treatment device for a biomass boiler, comprising a housing (1), characterized in that: One to three spray trays (2) and at least one gas distribution tray (3) are provided inside the housing (1). The spray trays (2) include a first spray tray (21), a second spray tray (22), and a third spray tray (23). An inlet smoke port (11) and an outlet smoke port (12) are provided outside the housing (1). The inlet smoke port (11) is provided on the side wall near the bottom of the housing (1), and the outlet smoke port (12) is located at the top of the housing (1). The inlet smoke port (11) is located between the first spray tray (21) and the overflow port (42) and is on one side of the dust removal chamber (6). A vertical intermediate partition (4) is installed at the bottom inside the housing (1), and an inclined plate (5) is installed at the top of the intermediate partition (4); the intermediate partition (4), the inclined plate (5), and the inner wall of the housing (1) together enclose a dust removal chamber (6). An air outlet (41) is opened above the intermediate partition (4), and an overflow port (42) is opened at the middle position of the intermediate partition (4). The first spray tray (21) is arranged inside the dust removal chamber (6) and is located between the air outlet (41) and the overflow port (42).

2. The biomass boiler flue gas treatment device according to claim 1, characterized in that: One end of the inlet smoke port (11) close to the housing (1) is narrowed, and one end of the inlet smoke port (11) is tangent to the outer wall of the housing (1).

3. The flue gas treatment device for biomass boilers according to claim 1, characterized in that: A demister (8) is provided at the position of the housing (1) close to the outlet smoke port (12).

4. The biomass boiler flue gas treatment device according to claim 1, wherein: A spray pipe is installed on one side outer wall of the housing (1). The spray pipe includes a circulation pump (131) and a circulation pipeline (13). A liquid storage chamber (7) is formed between the inner wall of the housing (1) and the intermediate partition (4). The inlet of the circulation pipeline (13) is connected to the liquid storage chamber (7), and the outlet of the circulation pipeline (13) is connected to different spray trays (2) through different pipelines; the spray liquid stored in the liquid storage chamber (7) is sodium hydroxide solution, calcium hydroxide solution, magnesium hydroxide solution, or ammonia water solution.

5. The flue gas treatment device for biomass boilers according to claim 1, characterized in that: A liquid supplement pipe (72), a first drain pipe (61), and a second drain pipe (71) are opened on the side wall of the housing (1); the liquid supplement pipe (72) and the second drain pipe (71) are on one side of the liquid storage chamber (7), and the first drain pipe (61) is on one side of the dust removal chamber (6).

6. The biomass boiler flue gas treatment device according to claim 1, characterized in that: The first spray tray (21) is semi-circular and includes a first spray main pipe (211) and a plurality of first spray branch pipes (212) connected to the first spray main pipe (211). A plurality of first spray heads (213) are installed on the first spray branch pipes (212), and the first spray branch pipes (212) are connected to the circulation pipeline (13).

7. The flue gas treatment device for biomass boilers according to claim 1, wherein: The second spray tray (22) and the third spray tray (23) have the same structure. The second spray tray (22) is circular and includes a second spray main pipe (221) and a plurality of second spray branch pipes (222) connected to the second spray main pipe (221). A plurality of second spray heads (223) are installed on the second spray branch pipes (222), and the second spray main pipe (221) is connected to the circulation pipeline (13).

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