A multi-stage water bath dust removal device for biomass combustion furnace flue gas cleaning

Abstract

The present invention provides a multi-stage water bath dust removal device for biomass furnace flue gas cleaning, including a flue gas pipe, the flue gas pipe is connected to a water bath dust removal device, the water bath dust removal device includes a primary water bath dust collector, a secondary water bath dust collector, and a tertiary water bath dust collector arranged in parallel, the primary water bath dust collector, the secondary water bath dust collector, and the tertiary water bath dust collector all include a dust collector housing, each of the dust collector housings is provided with a cylindrical gas distributor, each of the cylindrical gas distributors includes a backwash distributor arranged at the center of the cylindrical gas distributor, a screen is arranged on the periphery of the backwash distributor, and a sedimentation tank is arranged at the bottom of the water bath dust removal device. The present invention can not only automatically and efficiently realize the dust removal of dust-containing flue gas of biomass furnaces, and the dust removal effect is ideal, but also the dust removal water can be recycled for multiple uses or for irrigation, which greatly saves water resources and is worthy of large-scale promotion.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas cleaning, and in particular to a multi-stage water bath dust removal device used for cleaning flue gas from a biomass combustion furnace. Background Art

[0002] With the introduction of the national carbon neutrality strategy, the reuse of clean energy has become more and more popular. With the popularization of large-scale breeding in rural areas, more and more straw is discarded. Biomass boilers that make combustible particles based on waste straw, wood, etc. have been rapidly applied, especially in greenhouses. It can solve the problem of carbon dioxide gas fertilizer and regulate the temperature and humidity of the greenhouse. However, traditional biomass boilers use direct combustion in the greenhouse and have no flue gas dust removal facilities, which not only pollutes the environment but also affects the growth of crops.

[0003] Existing water bath dust removal is mostly used in power plant boilers and coal chemical incinerators. Currently, there is no multi-stage water bath dust removal facility for biomass combustion furnaces that can be switched freely to achieve ultra-high dust removal effect.

[0004] Most of the solids in the flue gas of biomass boilers are wood ash, the main component of which is potassium carbonate. Potassium carbonate is a very good potassium fertilizer and an indispensable trace element for plant growth. Currently, there is no dust removal facility that can recycle the potassium fertilizer in the flue gas.

[0005] The existing water bath dust removal does not have the automatic sewage discharge and self-cleaning functions, and requires a lot of manpower and material resources to clean up the solids. Summary of the invention

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] A multi-stage water bath dust removal device for biomass combustion furnace flue gas cleaning, comprising a flue gas pipe, the flue gas pipe is connected to a water bath dust removal device, the water bath dust removal device comprises a primary water bath dust collector, a secondary water bath dust collector, and a tertiary water bath dust collector arranged in parallel, the primary water bath dust collector, the secondary water bath dust collector, and the tertiary water bath dust collector all comprise a dust collector box, each of the dust collector boxes is provided with a cylindrical gas distributor, each of the cylindrical gas distributors comprises a backwash distributor arranged at the center of the cylindrical gas distributor, and a screen is arranged on the periphery of the backwash distributor , a float-type water replenishment valve is provided on the top of each dust collector box, a flushing pipe is provided at the bottom of each backwash distributor, each flushing pipe is connected to a clean water pump, a sealing valve is provided on the top of each dust collector box, and the sealing valve is connected to a sealing valve counterweight; a sedimentation tank is provided at the bottom of the water bath dust removal device, a guide tube is provided in the sedimentation tank corresponding to the lower part of each sealing valve, a clean water tank is connected to the right side of the sedimentation tank, an overflow hole is provided between the sedimentation tank and the clean water tank, a suspended liquid collection arm is provided on the upper part of the clean water tank, and the suspended liquid collection arm is connected to the clean water pump;

[0008] The flue gas pipe is connected to the primary water bath dust collector through a flue gas branch pipe 1, and a valve 1 is provided on the flue gas branch pipe 1. The primary water bath dust collector and the secondary water bath dust collector are connected through a flue gas branch pipe 2, and a valve 2 is provided on the flue gas branch pipe 2. The flue gas branch pipe 2 is connected to the flue gas pipe through a flue gas branch pipe 3. A flue gas valve 1 is provided on the right end of the connection between the flue gas branch pipe 3 and the flue gas pipe, and a valve 3 is provided on the flue gas branch pipe 3. The secondary water bath dust collector and the tertiary water bath dust collector are connected through a flue gas branch pipe 4, and a valve 4 is provided on the flue gas branch pipe 4. The flue gas branch pipe 4 is connected to the flue gas pipe through a flue gas branch pipe 5, and a valve 5 is provided on the flue gas branch pipe 5. A flue gas valve 2 is provided on the left side of the connection between the flue gas pipe and the flue gas branch pipe, and a smoke valve 3 is provided on the right side. The flue gas pipe is connected to the tertiary water bath dust collector through a flue gas branch pipe 6, and a valve 6 is provided on the flue gas branch pipe 6.

[0009] As a preferred solution, the backwash distributor is a backwash filter.

[0010] As a preferred solution, the clean water pump is connected to a user system.

[0011] As a preferred solution, the top and bottom of the dust collector housing are cone-shaped.

[0012] As a preferred solution, the sedimentation tank and the clear water tank are treated with epoxy resin for anti-seepage.

[0013] As a preferred solution, the sealing surface material of the sealing valve is polytetrafluoroethylene.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the dust-containing flue gas from the biomass combustion furnace enters each dust collector box of the water bath dust removal device through the flue gas pipe, and enters the cylindrical gas distributor from the upper part of the dust collector box. The gas enters the cylindrical gas distributor and is filtered and treated by the backwash distributor. It is then cut into small bubbles through a screen to increase the contact area between water and the dust-containing flue gas. After the dust-containing flue gas contacts the water in the dust collector box, the solids remain in the water, the gas goes up to the top gas phase space, and is sent to the next-level water bath dust collector through a pipeline for further purification. The solids retained in the water settle to the bottom of the dust collector box under the action of gravity. When the solids settled to the bottom of the dust collector box accumulate to a certain amount and the gravity is greater than the sealing valve counterweight, the bottom sealing valve opens, and the solid-containing liquid is discharged into the sedimentation tank through the guide tube. The side wall of the sedimentation tank is provided with an overflow hole, and the clean water after sedimentation in the sedimentation tank overflows into the clean water tank. A suspended liquid collection arm is installed at the entrance of the clean water tank, and the suspended liquid collection arm is connected to a clean water pump; the clean water pump pumps the clean water in the clean water tank out for recycling. Because there is wood ash in the flue gas, it dissolves in water to form potassium bicarbonate, which can also be used as irrigation water and fertilizer.

[0015] The present invention can not only automatically and efficiently remove dust from dusty flue gas in biomass combustion furnaces with ideal dust removal effect, but also can recycle the dust removal water for multiple uses or for irrigation, thus greatly saving water resources and worthy of wide-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0017] Figure 1 It is a schematic diagram of the connection structure of the present invention. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0019] A multi-stage water bath dust removal device for biomass combustion furnace flue gas cleaning, comprising a flue gas pipe 1, the flue gas pipe 1 is connected to a water bath dust removal device 2, the water bath dust removal device 2 comprises a primary water bath dust collector 201, a secondary water bath dust collector 202, and a tertiary water bath dust collector 203 arranged in parallel, the primary water bath dust collector 201, the secondary water bath dust collector 202, and the tertiary water bath dust collector 203 all comprise a dust collector box 3, each of the dust collector boxes 3 is provided with a cylindrical gas distributor 4, each of the cylindrical gas distributors 4 comprises a backwash distributor 5 arranged at the center of the cylindrical gas distributor 4, the backwash distributor 5 is provided with a screen 6 on the periphery, and each of the dust collector boxes A float-type water replenishment valve 6 is provided at the top of the body 3 for automatic water replenishment after sewage discharge. A flushing pipe 7 is provided at the bottom of each backwash distributor 5, and each flushing pipe 7 is connected to a clean water pump 8. A sealing valve 9 is provided at the top of each dust collector box 3, and the sealing valve 9 is connected to a sealing valve counterweight 10; a sedimentation tank 11 is provided at the bottom of the water bath dust removal device 2, and a guide tube 12 is provided in the sedimentation tank 11 corresponding to the lower part of each sealing valve 9. A clean water tank 13 is connected to the right side of the sedimentation tank 11, and an overflow hole 14 is provided between the sedimentation tank 11 and the clean water tank 13. A suspended liquid collection arm 15 is provided on the upper part of the clean water tank 13, and the suspended liquid collection arm 15 is connected to the clean water pump 8;

[0020] The dust-containing flue gas from the biomass combustion furnace enters the dust collector box 3 through the flue gas pipe 1, and enters the cylindrical gas distributor 4 from the upper part of the dust collector box 3. After the gas enters the cylindrical gas distributor 4 and is filtered by the backwash distributor 5, it is cut into small bubbles by the screen 6 to increase the contact area between water and the dust-containing flue gas. After the dust-containing flue gas contacts the water in the dust collector box 3, the solids remain in the water, and the gas goes up to the top gas phase space and is sent to the next-level water bath dust collector through the pipeline for further purification. The solids retained in the water settle to the bottom of the dust collector box 3 under the action of gravity.

[0021] The flue gas pipe 1 is connected to the primary water bath dust collector 201 through a flue gas branch pipe 16, and a valve 17 is provided on the flue gas branch pipe 16. The primary water bath dust collector 201 and the secondary water bath dust collector 202 are connected through a flue gas branch pipe 2 18, and a valve 2 19 is provided on the flue gas branch pipe 2 18. The flue gas branch pipe 2 18 is connected to the flue gas pipe 1 through a flue gas branch pipe 3 20, and a flue gas valve 1 21 is provided at the right end of the connection between the flue gas branch pipe 3 20 and the flue gas pipe 1, and a valve 3 22 is provided on the flue gas branch pipe 3 20. The water bath dust collector 202 and the three-stage water bath dust collector 203 are connected through a flue gas branch pipe four 23, on which a valve four 24 is provided. The flue gas branch pipe four 23 is connected to the flue gas pipe 1 through a flue gas branch pipe five 25, on which a valve five 26 is provided. A flue gas valve two 27 is provided on the left side of the connection between the flue gas pipe 1 and the flue gas branch pipe five 25, and a smoke valve three 28 is provided on the right side. The flue gas pipe 1 is connected to the three-stage water bath dust collector 203 through a flue gas branch pipe six 29, on which a valve six 30 is provided.

[0022] Furthermore, the backwash distributor 5 is a backwash filter.

[0023] Furthermore, the top and bottom of the dust collector housing 3 are cone-shaped.

[0024] Furthermore, the sedimentation tank 11 and the clean water tank 13 are treated with epoxy resin for anti-seepage.

[0025] Furthermore, the sealing surface material of the sealing valve 9 is polytetrafluoroethylene.

[0026] According to actual implementation, the water bath dust removal device 2 is not limited to setting up a three-stage water bath dust collector, and additional parallel stages can be set to increase the processing capacity.

[0027] When the flue gas is treated, valve one 17, valve two 19, valve four 24, and valve six 30 are opened, and flue gas valve one 21, valve three 22, flue gas valve two 27, valve five 26, and flue gas valve three 28 are closed to form a three-stage series dust removal mode of a first-stage water bath dust collector 201, a second-stage water bath dust collector 202, and a third-stage water bath dust collector 203. The solid-containing flue gas from the biomass combustion furnace enters the cylindrical gas distributor 4 of the first-stage water bath dust collector 201 from the flue gas pipe 1 through valve one, and is filtered and treated by the backwash distributor. It is cut into small bubbles from the screen 6 and then discharged. Under the constraint of the cylindrical gas distributor 4, it contacts with water upward. The solid remains in the water and settles to the bottom by gravity. The gas gathers in the gas phase space at the top and enters the dust collector box 3 of the second-stage water bath dust collector 202 after passing through valve two. When the solid settled to the bottom of the dust collector box 3 accumulates to a certain amount and the gravity is greater than the sealing valve When the counterweight hammer 10 is pressed, the bottom sealing valve 9 is opened, and the solid-containing liquid is discharged into the sedimentation tank 11 through the guide tube 12. The discharged solid-liquid mixture directly enters the sedimentation tank 11 below the liquid level through the guide tube 12 to ensure that the disturbance to the sedimentation tank 11 is reduced during the sewage discharge process. After the solid is discharged, the liquid level in the dust collector box 3 drops. Relying on the weight of the counterweight hammer 10, the sealing valve 9 will be closed again. The sealing structure of the sealing valve and counterweight hammer 10 can freely adjust the sewage discharge time according to the fuel of the biomass burner. At the same time, when the liquid in the dust collector box 3 drops, the float-type water replenishing valve 6 will automatically open to replenish water to the dust collector box 3 until the specified liquid level; when the dust collector box 3 has been running for a certain period of time (this time is also different according to the fuel of the biomass fuel), the clean water pump 8 can be opened to each backwash distributor 5 to flush the solids on the backwash distributor 5 and the screen 6 to ensure the dust removal effect and efficiency. An overflow hole 14 is opened on the side wall of the sedimentation tank 11, and the clean water after sedimentation in the sedimentation tank overflows into the clean water tank 13. A suspended liquid collection arm 15 is installed at the entrance of the clean water tank 13, and the suspended liquid collection arm 15 is connected to the clean water pump 8; the clean water pump 8 pumps out the clean water in the clean water tank 13 for recycling. Because there is wood ash in the flue gas, it dissolves in water to form potassium bicarbonate, which can also be used as irrigation water and fertilizer.

[0028] The specific implementation of the present invention is described in detail above, but it is only used as an example. The present invention is not limited to the specific implementation cases described above, and equivalent modifications to the present invention are also within the protection scope of the present invention.

Claims

1. A multi-stage water bath dust removal device for biomass combustion furnace flue gas cleaning, characterized in that: The invention comprises a flue gas pipe (1), wherein the flue gas pipe (1) is connected to a water bath dust removal device (2), wherein the water bath dust removal device (2) comprises a primary water bath dust collector (201), a secondary water bath dust collector (202), and a tertiary water bath dust collector (203) arranged in parallel, wherein the primary water bath dust collector (201), the secondary water bath dust collector (202), and the tertiary water bath dust collector (203) all comprise a dust collector housing (3), wherein each of the dust collector housings (3) is provided with a cylindrical gas distributor (4), wherein each of the cylindrical gas distributors (4) comprises a backwash distributor (5) arranged at the center of the cylindrical gas distributor (4), wherein a screen (6) is arranged on the periphery of the backwash distributor (5), and wherein a float is arranged on the top of each of the dust collector housings (3). A water replenishment valve is provided, each backwash distributor (5) is provided with a flushing pipe (7) at the bottom, each flushing pipe (7) is connected to a clean water pump (8), each dust collector housing (3) is provided with a sealing valve (9) at the bottom, and the sealing valve (9) is connected to a sealing valve counterweight (10); a sedimentation tank (11) is provided at the bottom of the water bath dust removal device (2), a guide tube (12) is provided in the sedimentation tank (11) corresponding to the lower part of each sealing valve (9), a clean water tank (13) is connected to the right side of the sedimentation tank (11), an overflow hole (14) is provided between the sedimentation tank (11) and the clean water tank (13), a suspended liquid collection arm (15) is provided at the upper part of the clean water tank (13), and the suspended liquid collection arm (15) is connected to the clean water pump (8); The flue gas pipe (1) is connected to the primary water bath dust collector (201) via a flue gas branch pipe 1 (16), the flue gas branch pipe 1 (16) is provided with a valve 1 (17), the primary water bath dust collector (201) and the secondary water bath dust collector (202) are connected via a flue gas branch pipe 2 (18), the flue gas branch pipe 2 (18) is provided with a valve 2 (19), the flue gas branch pipe 2 (18) is connected to the flue gas pipe (1) via a flue gas branch pipe 3 (20), the right end of the connection between the flue gas branch pipe 3 (20) and the flue gas pipe (1) is provided with a flue gas valve 1 (21), the flue gas branch pipe 3 (20) is provided with a valve 3 (22), the secondary ...22), the secondary water bath dust collector (201) and the secondary water bath dust collector (202) are connected via a flue gas branch pipe 2 (18), the secondary water bath dust collector (201) and the secondary water bath dust collector (202) are connected via a flue gas The dust collector (202) and the three-stage water bath dust collector (203) are connected via a fourth flue gas branch pipe (23), a fourth valve (24) is provided on the fourth flue gas branch pipe (23), the fourth flue gas branch pipe (23) is connected to the flue gas pipe (1) via a fifth flue gas branch pipe (25), a fifth valve (26) is provided on the fifth flue gas branch pipe (25), a second flue gas valve (27) is provided on the left side of the connection between the flue gas pipe (1) and the fifth flue gas branch pipe (25), and a third flue gas valve (28) is provided on the right side, the flue gas pipe (1) is connected to the three-stage water bath dust collector (203) via a sixth flue gas branch pipe (29), a sixth valve (30) is provided on the sixth flue gas branch pipe (29); The backwash distributor (5) is a backwash filter; The clean water pump (8) is connected to a user system (31); The top and bottom of the dust collector housing (3) are cone-shaped; The sedimentation tank (11) and the clear water tank (13) are treated with epoxy resin for anti-seepage; The sealing surface material of the sealing valve (9) is polytetrafluoroethylene; The solid-containing flue gas from the biomass combustion furnace enters the cylindrical gas distributor (4) of the primary water bath dust collector (201) from the flue gas pipe (1) through valve 1, is filtered by the backwash distributor, is cut into small bubbles from the screen (6) and is discharged, and contacts the water upward under the constraint of the cylindrical gas distributor (4). The solid remains in the water and settles to the bottom by gravity. The gas gathers in the gas phase space at the top and enters the dust collector box (3) of the secondary water bath dust collector (202) after passing through valve 2. After the dust collector housing (3) has been running for a certain period of time, the clean water pump (8) can be turned on to each backwash distributor (5) to wash the solids on the backwash distributor (5) and the screen (6) to ensure the dust removal effect and efficiency.

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