Biomass boiler dust removal system

Abstract

The utility model relates to the technical field of boilers, in particular to a biomass boiler dust removal system which is used for treating tail gas of a biomass boiler and comprises a deposition box, a water washing box, a spray tower and an electrostatic dust removal tower, a V-shaped gas passing channel is arranged in the deposition box, and an ash discharge pipeline is obliquely arranged at the bottom of the gas passing channel. The ash discharge pipeline is communicated with the air inlet end of the biomass boiler; one end of the gas passing channel is communicated with a gas outlet of the biomass boiler; the inlet end of the washing tank is communicated with the air outlet end of the air passing channel; the inlet end of the spray tower is communicated with the gas outlet of the water washing tank; and the electrostatic dust collection tower is connected to a gas outlet of the spray tower. The biomass boiler dust removal system can effectively solve the problem of recovery of carbon ash and carbon black in the combustion process of biomass fuel, and can also purify tail gas.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a biomass boiler dust removal system. Background Art

[0002] During the soft porcelain production process, multiple drying operations are required. Therefore, current soft porcelain molding lines often rely on centralized boiler heating. To reduce production costs, these boilers typically use biomass fuel. Although biomass fuel has an unstable calorific value, the heat required for soft porcelain drying is relatively low and the temperature is not high. Therefore, biomass fuel can fully meet the heat requirements of the current soft porcelain drying process.

[0003] Current biomass fuel boilers all have a problem: during the biomass combustion process, due to the different biomass materials and different dryness and wetness, it is difficult to fully burn. Incompletely burned biomass will form charcoal ash and carbon black, which will be discharged outward with the combustion exhaust gas, which will lead to fuel loss and environmental pollution. Although currently, for such situations, a purification system is generally used to treat the exhaust gas to avoid causing environmental pollution, for example, a biomass-specific boiler disclosed in patent publication number CN108826338A has a water distribution pipe for spraying and cooling the flue gas in the dust filter box, which can spray from top to bottom and drain the sewage into the sewage pool for storage and sedimentation. At the same time, the clean water obtained from the sedimentation in the sewage pool is pumped out again by a pump and transported to the water distribution pipe for spraying and dust removal again. It has the advantages of energy conservation, good dust removal effect and low environmental pollution. In addition, the ceramic tiles in the dust filter box can withstand the scouring and corrosion of flue gas and spray water, and have high hardness, are not easy to corrode and have a long service life. However, this technical solution cannot effectively recover the carbon ash and carbon black in the tail gas, and still does not effectively solve the above-mentioned problems. Utility Model Content

[0004] In order to overcome one of the deficiencies of the prior art, the purpose of the present invention is to provide a biomass boiler dust removal system, which can effectively solve the problem of recovering carbon ash and carbon black during the combustion of biomass fuel, and can also purify exhaust gas.

[0005] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0006] A biomass boiler dust removal system is used to treat the exhaust gas of the biomass boiler, including a sedimentation box, a water washing box, a spray tower and an electrostatic dust removal tower. A V-shaped air passage is provided inside the sedimentation box, and an ash discharge pipe is provided at an angle at the bottom of the air passage, and the ash discharge pipe is connected to the air inlet end of the biomass boiler; one end of the air passage is connected to the air outlet of the biomass boiler; the inlet end of the water washing box is connected to the air outlet end of the air passage; the inlet end of the spray tower is connected to the air outlet of the water washing box; and the electrostatic dust removal tower is connected to the air outlet of the spray tower.

[0007] Furthermore, the sedimentation box includes a box body and a V-shaped plate arranged in the box body, the V-shaped plate divides the box body into the air passage and the heat exchange chamber, the heat exchange chamber is connected to the external heat exchange mechanism, and the box body is respectively provided with connecting tubes at both end areas of the air passage, and the two connecting tubes are respectively connected to the water washing box and the air outlet of the biomass boiler; one end of the ash discharge pipe is connected to the bottom of the box body.

[0008] Furthermore, the box body is provided with two connecting pipes communicating with the heat exchange cavity.

[0009] Furthermore, any of the connecting pipes passes through the V-shaped plate and the gas outlet end of the gas passage in sequence, and the connecting pipe passing through the V-shaped plate forms a serpentine heat exchange area in the gas passage.

[0010] Furthermore, an ash cleaning port is provided on one end of the ash discharge pipe close to the box body, and an openable sealing door is provided on the ash cleaning port.

[0011] Furthermore, a collecting hopper is provided in the bottom area of ​​the box body located at the air passage, and one end of the ash discharge pipe is connected to the discharge end of the collecting hopper.

[0012] Furthermore, a suction fan is provided between the spray tower and the electrostatic dust removal tower.

[0013] Furthermore, a sewage pipe is provided at the bottom of the water washing box, and a sewage valve is provided on the sewage pipe.

[0014] Furthermore, the ash discharge pipe is connected to an air inlet duct, and a blower is provided on the air inlet duct, and the blower blows toward the air inlet end of the biomass boiler.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] A biomass boiler dust removal system of the present invention utilizes a sedimentation box to deposit flue gas, and utilizes natural gravity to deposit the charcoal ash and carbon black in the exhaust gas. At the same time, the V-shaped air passage is conducive to the adhesion and deposition of the carbon black in the flue gas. Such a design is conducive to the recovery of the carbon ash and carbon black. At the same time, the bottom of the air passage is connected to the air inlet end of the biomass boiler through an ash discharge pipe, and the air inlet air flow of the biomass boiler drives the carbon black and carbon ash at the bottom of the air passage to be sucked into the biomass boiler again for secondary combustion. Such a design can fully recover and reuse the carbon black and carbon ash in the exhaust gas, thereby reducing the waste of biomass fuel.

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the sedimentation box in the embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of the internal structure of a sedimentation box in another embodiment of the present invention.

[0021] Description of Figure Numbers:

[0022] Biomass boiler 10, air inlet duct 11, blower 12, sedimentation box 20, air passage 21, ash discharge pipe 22, box body 23, V-shaped plate 24, heat exchange chamber 25, connecting tube 26, connecting pipe 27, ash cleaning port 28, sealing door 29, collecting hopper 2a, water washing box 30, sewage pipe 31, sewage valve 32, spray tower 40, electrostatic dust removal tower 50, suction fan 60. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Reference Figures 1 to 3A biomass boiler dust removal system shown is used for treating the exhaust gas of a biomass boiler 10, and includes a sedimentation box 20, a water washing box 30, a spray tower 40 and an electrostatic precipitator 50. A V-shaped air passage 21 is provided inside the sedimentation box 20, and an ash discharge pipe 22 is provided at an angle at the bottom of the air passage 21, and the ash discharge pipe 22 is connected to the air inlet end of the biomass boiler 10; one end of the air passage 21 is connected to the air outlet of the biomass boiler 10; the inlet end of the water washing box 30 is connected to the air outlet end of the air passage 21; the inlet end of the spray tower 40 is connected to the air outlet of the water washing box 30; and the electrostatic precipitator 50 is connected to the air outlet of the spray tower 40.

[0025] Among them, the water washing box 30, the spray tower 40 and the electrostatic dust removal tower 50 are all conventional dust removal equipment, and the specific structure of each feature is not described in detail in this application. In one embodiment, a suction fan 60 is provided between the spray tower 40 and the electrostatic dust removal tower 50, and the suction fan 60 directly extracts the flue gas from the biomass boiler 10, which is conducive to the flow and sedimentation of the flue gas. In an improved embodiment, since the main purpose of the water washing box 30 is to directly bring the flue gas passing through the water washing box 30 into full contact with the water body inside it, and to utilize a large area of ​​water to remove dust from the flue gas, the water washing box 30 is prone to produce sludge at the bottom. For this reason, in one embodiment of the present application, a sewage pipe 31 is provided at the bottom of the water washing box 30, and a sewage valve 32 is provided on the sewage pipe 31.

[0026] It should be noted that in the present application, since the biomass boiler 10 directly burns biomass, its flue gas must contain a large amount of charcoal and carbon ash, wherein carbon ash is the product of complete combustion, and char is the product of incomplete combustion. Therefore, the design of the sedimentation box 20 can effectively directly settle the large amount of charcoal and carbon ash following in the flue gas, which can reduce the carbon ash content in the exhaust gas to a certain extent and reduce environmental pollution. At the same time, it can also recycle the charcoal flowing with the flue gas, which is conducive to secondary utilization.

[0027] The biomass boiler dust removal system utilizes a sedimentation box 20 to deposit the flue gas, and utilizes natural gravity to deposit the carbon ash and carbon black in the exhaust gas. At the same time, the V-shaped air passage 21 is conducive to the adhesion and deposition of carbon black in the flue gas. Such a design is conducive to the recovery of carbon ash and carbon black. At the same time, the bottom of the air passage 21 is connected to the air inlet end of the biomass boiler 10 through the ash discharge pipe 22. The air intake flow of the biomass boiler 10 is used to drive the carbon black and carbon ash at the bottom of the air passage 21 to be sucked back into the biomass boiler 10 for secondary combustion. Such a design can fully recycle and reuse the carbon black and carbon ash in the exhaust gas, thereby reducing the waste of biomass fuel.

[0028] For further information, see Figure 2In order to recycle the heat in the flue gas and quickly settle the particulate matter in the flue gas to prevent it from being discharged outward with the flue gas, the sedimentation box 20 includes a box body 23 and a V-shaped plate 24 arranged in the box body 23. The V-shaped plate 24 divides the box body 23 into the air passage 21 and the heat exchange chamber 25. The heat exchange chamber 25 is connected to the external heat exchange mechanism. The box body 23 is respectively provided with connecting tubes 26 at both end areas of the air passage 21. The two connecting tubes 26 are respectively connected to the water washing box 30 and the air outlet of the biomass boiler 10; one end of the ash discharge pipe 22 is connected to the bottom of the box body 23. The design of the heat exchange chamber 25 allows heat to be recovered from the flue gas while simultaneously cooling the flue gas, reducing the flue gas's ability to carry fly ash, specifically, soot and char. Furthermore, the design of the V-shaped plate 24 creates a zigzag trajectory for the flue gas, allowing gravity to naturally settle the fly ash in the flue gas, thereby improving the overall flue gas's ability to settle. The outward-facing end of the connecting tube 26 is equipped with a flange to facilitate connection to external piping.

[0029] See also Figure 3 In the above-mentioned improved embodiment, to facilitate communication with the heat exchange chamber 25, the housing 23 is provided with two connecting pipes 27 communicating with the heat exchange chamber 25. Each connecting pipe 27 sequentially passes through the V-shaped plate 24 and the outlet end of the air passage 21. This design reuses the heat of the flue gas passing through the outlet end of the air passage 21. Furthermore, the connecting pipe 27 serves as the water inlet end, thereby maximizing heat exchange and cooling of the flue gas, thereby facilitating the settling of fly ash in the flue gas.

[0030] Furthermore, in order to enhance the heat exchange effect, the connecting pipe 27 passing through the V-shaped plate 24 forms a serpentine heat exchange area in the air passage 21 .

[0031] See also Figure 3 In one embodiment of the present application, to facilitate the removal of dust adhering to the V-shaped plate 24 and the sidewalls of the housing 23, a dust removal port 28 is provided at one end of the dust removal duct 22 near the housing 23. The dust removal port 28 is provided with an openable sealing door 29. To prevent heat loss, the outer wall of the dust removal duct 22 is coated with a thermal insulation material, such as asbestos.

[0032] In one embodiment of the present application, in order to facilitate the discharge of smoke and dust that falls on the bottom of the box body 23, that is, the discharge of carbon ash and charcoal ash to the outside, the box body 23 is provided with a collecting hopper 2a in the bottom area of ​​the air passage 21, and one end of the ash discharge pipe 22 is connected to the discharge end of the collecting hopper 2a.

[0033] In order to allow the smoke falling into the ash discharge pipe 22 to be brought back into the biomass boiler 10, in the above-mentioned improved embodiment, the ash discharge pipe 22 is connected to an air inlet duct 11, and a blower 12 is provided on the air inlet duct 11. The blower 12 blows toward the air inlet end of the biomass boiler 10. In the above-mentioned embodiment, the airflow blown out by the blower 12 basically enters from the bottom of the biomass boiler 10. Such a design can utilize the negative pressure formed by the airflow blown out by the blower 12 to carry away the smoke in the ash discharge pipe 22 and re-enter the biomass boiler 10. At the same time, since these smoke dusts are mixed in the airflow, the combustible part, such as charcoal, will burn again when encountering high temperature when entering the biomass boiler 10, while the incombustible part will be intercepted by other large pieces of carbon or unburned biomass, reducing the probability of re-entering the sedimentation box 20.

[0034] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A biomass boiler dust removal system for treating tail gas from a biomass boiler, characterized in that: include: The evaporation tube has a bottom surface that is provided with an evaporative cooling fan, and the evaporative cooling fan has a bottom surface that is provided with an evaporative cooling fan, and the evaporative cooling fan has a bottom surface that is provided with an evaporative cooling fan. a water washing box, the inlet end of which is connected to the outlet end of the air passage; a spray tower, the inlet of which is connected to the air outlet of the water washing box; An electrostatic dust removal tower is connected to the air outlet of the spray tower.

2. A biomass boiler dust removal system according to claim 1, characterized in that: An ash cleaning port is provided on one end of the ash discharge pipe close to the box body, and an openable sealing door is provided on the ash cleaning port.

3. The biomass boiler dust removal system according to claim 1, characterized in that: The box body is provided with a collecting hopper in the bottom area of ​​the air passage, and one end of the ash discharge pipe is connected to the discharge end of the collecting hopper.

4. A biomass boiler dust removal system according to any one of claims 1 to 3, characterized in that: A suction fan is provided between the spray tower and the electrostatic dust removal tower.

5. A biomass boiler dust removal system according to any one of claims 1 to 3, characterized in that: A sewage pipe is provided at the bottom of the water washing box, and a sewage valve is provided on the sewage pipe.

6. A biomass boiler dust removal system according to any one of claims 1 to 3, characterized in that: The ash discharge pipe is connected to an air inlet tube, and a blower is provided on the air inlet tube. The blower blows toward the air inlet end of the biomass boiler.

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