Air inlet filtering and dust removing system of gas-fired boiler

Abstract

The utility model provides an air inlet filtering dust removal system of a gas-fired boiler. The tail end of an air inlet vertical pipe is communicated with an air inlet of a filtering dust removal cavity, and a dust cleaning opening is formed in the side face of the lower end of the filtering dust removal cavity. The side face of a cavity body of the filtering dust removal cavity is communicated with an air pipe, and the air pipe is isolated from the cavity body of the filtering dust removal cavity through a filtering plate. The purging opening is formed in the side surface of the cavity and is close to the upper end of the filter plate and the air inlet of the filter dust removal cavity. The dust removal air valve is installed on the air pipe, and an air outlet of the air pipe is communicated with the draught fan. The dedusting device has the advantages that the dedusting process is simple to operate, continuous operation of the boiler is guaranteed, and safety of a boiler flue gas and air system is improved. Outdoor air is sucked in an organized mode and is filtered for dust removal, boiler room negative pressure and dust accumulation at gaps and holes caused by indoor air suction are avoided, and the working environment in a boiler room is improved. The device can be directly installed near a boiler burner, an air blower equipment room does not need to be independently arranged, space and construction investment are saved, and meanwhile operation management is convenient.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology for gas-fired boilers, and in particular to a gas-fired boiler inlet air filtration and dust removal system. Background Technology

[0002] With increasing environmental pressures, gas-fired boilers are being used for both residential heating and industrial steam supply. Depending on the boiler's installed capacity, small-capacity boilers typically have the blower and burner integrated into the boiler body, with the blower drawing air directly from the boiler room, and supplemental air coming in through gaps in the boiler room's doors and windows. Large-capacity boilers, due to their larger air intake, require additional air intake ducts to draw air from the outside and necessitate a separate blower room.

[0003] However, direct indoor air intake creates negative pressure in the boiler room, leading to difficulties in opening doors and windows and hindering odor dissipation. Furthermore, boiler combustion consumes far more gas than normal ventilation, and unorganized air intake causes rapid ash accumulation in air intake gaps and openings, severely impacting the indoor environment. Large boilers, requiring separate blower rooms, not only occupy space but also increase the length of horizontal ventilation ducts, causing dust to accumulate in the blower ducts during air intake, making post-operation cleaning difficult. Therefore, providing a gas-fired boiler capable of filtering airborne dust is a pressing issue. Utility Model Content

[0004] This utility model provides a gas-fired boiler air intake filtration and dust removal system to solve the problem of ash accumulation at the air intake of gas-fired boilers affecting combustion efficiency in the prior art. It also solves the problem that gas-fired boilers in the prior art require a separate blower room, which occupies space and increases the length of horizontal ventilation ducts, making post-operation cleaning difficult.

[0005] To achieve the above objectives, this utility model provides a gas-fired boiler air inlet filtration and dust removal system, comprising: an air inlet riser, a filtration and dust removal chamber, a filter plate, a dust removal port, a purge port, a dust removal valve, and a dust removal air outlet. The end of the air inlet riser is connected to the air inlet of the filtration and dust removal chamber, and a dust removal port is provided on the lower side of the filtration and dust removal chamber. The side of the filtration and dust removal chamber is connected to an air duct, and the air duct and the filtration and dust removal chamber are separated by the filter plate. The purge port is provided on the side of the chamber, near the upper end of the filter plate and near the air inlet of the filtration and dust removal chamber. The dust removal valve is installed on the air duct, and the air outlet of the air duct is connected to a fan. The dust removal air outlet is provided on the air duct body between the dust removal valve and the fan.

[0006] As a preferred embodiment of the above technical solution, preferably, the lower edge of the duct extends into the cavity of the filtration and dust removal chamber without contacting the other side of the cavity, the upper edge of the duct is smoothly connected to the side of the cavity, and the filter plate is installed between the lower edge and the side of the cavity.

[0007] As a preferred embodiment of the above technical solution, it further includes an umbrella-shaped rain cap, which covers the opening of the air inlet riser.

[0008] As a preferred embodiment of the above technical solution, it further includes an insect-proof net, which is riveted / welded / snap-fitted to the inlet of the air inlet riser.

[0009] As a preferred embodiment of the above technical solution, the dust removal air outlet is preferably an opening and closing door composed of an iron plate, hinges, and rubber pads.

[0010] As a preferred embodiment of the above technical solution, the dust removal air outlet is a detachable fixed seal consisting of a steel blind flange and bolts.

[0011] As a preferred embodiment of the above technical solution, the filtration and dust removal chamber is preferably made of welded steel plate, and its connection with the purge port and the dust removal port is a cavity pipe formed by connecting short metal pipes and welding them with flanges.

[0012] As a preferred embodiment of the above technical solution, the dust removal valve is a steel rubber-sealed butterfly valve, and the flange at the connection between the dust removal valve and the filter dust removal chamber is fastened with bolts.

[0013] As a preferred embodiment of the above technical solution, the filter plate is preferably composed of an outer frame, a single layer of steel wire mesh, and a fiber filter cloth stacked together in one step.

[0014] This utility model provides a gas-fired boiler air intake filtration and dust removal system: the end of the air intake riser is connected to the air inlet of the filtration and dust removal chamber, and a dust removal port is opened on the side of the lower end of the filtration and dust removal chamber. The side of the filtration and dust removal chamber is connected to an air duct, and the air duct and the filtration and dust removal chamber are isolated by a filter plate. The purge port is opened on the side of the chamber, near the upper end of the filter plate and near the air inlet of the filtration and dust removal chamber. A dust removal air valve is installed on the air duct, and the air outlet of the air duct is connected to a fan.

[0015] The advantages of this utility model are:

[0016] (1) The dust removal process is simple to operate, while ensuring the uninterrupted operation of the boiler and improving the safety of the boiler flue gas system.

[0017] (2) Outdoor air is drawn in in an organized manner and filtered to remove dust, which avoids negative pressure in the boiler room and dust accumulation in gaps and holes caused by indoor air intake, thus improving the working environment in the boiler room.

[0018] (3) It can be installed directly near the boiler burner without the need for a separate blower equipment room, saving space and construction investment, while facilitating operation and management. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 Schematic diagram of the air intake filtration and dust removal system for a gas-fired boiler.

[0021] Figure 2 This is a structural diagram of the air intake filtration and dust removal system for a gas-fired boiler. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Now combined Figure 1 The schematic diagram of the gas boiler air intake filtration and dust removal system shown illustrates the technical solution of this utility model. The system includes: umbrella-shaped rain cap 1, insect net 2, air intake riser 3, filtration and dust removal chamber 4, filter plate 5, dust removal port 6, blowing port 7, dust removal air valve 8, dust removal air outlet 9, and air duct 11.

[0024] An umbrella-shaped rain cap 1 covers the opening of the air inlet riser 3, and an insect net 2 is fixed to the opening of the air inlet riser 3 by riveting, welding, or clipping. The end of the air inlet riser 3 is connected to the air inlet of the dust removal chamber 4, and a dust removal port 6 is opened on the side of the lower end of the dust removal chamber 4. The side of the dust removal chamber 4, which is a cavity made of welded steel plates, is connected to a duct 11, and the duct 11 and the cavity of the dust removal chamber 4 are separated by a filter plate 5. The filter plate 5 is composed of an outer frame, a single layer of steel wire mesh, and a fiber filter cloth stacked together. When installing the air inlet riser 3, it needs to pass through the roof or top plate and the soil layer on the top plate (in underground boiler rooms) and be fixed to the boiler room structure. The air inlet riser 3 is a finished spiral welded steel pipe or a circular pipe made on-site from galvanized steel plate.

[0025] Specifically, the lower edge of the duct 11 extends into the cavity of the dust removal chamber 4 without contacting the other side of the cavity, the upper edge of the duct 11 is smoothly connected to the side of the dust removal chamber 4, and the filter plate 5 is installed between the lower edge of the duct 11 and the side of the cavity.

[0026] A purge port 7 is provided on one side of the dust removal chamber, between the air inlet of the dust removal chamber 4 and the upper end of the filter plate 5. The connection between the dust removal chamber and the purge port 7 and the dust removal port 6 is a cavity pipe formed by welding short metal pipes to flanges.

[0027] A dust removal damper 8 is installed on the duct 11, and the air outlet of the duct 11 is connected to the fan. A dust removal air outlet 9 is opened on the pipe body between the dust removal damper 8 and the air outlet of the duct 11. Specifically, the dust removal damper 8 is a steel rubber-sealed butterfly valve, and the flange at the connection between the dust removal damper 8 and the filter dust removal chamber 4 is fastened with bolts.

[0028] Specifically, the dust removal vent 9 can be an opening and closing door composed of an iron plate, hinges, and rubber gaskets; the dust removal vent 9 can also be a detachable fixed seal composed of a steel blind flange and bolts.

[0029] The present invention's technical solution is described in conjunction with a specific implementation scenario. Figure 1 and Figure 2 As shown:

[0030] The boiler combustion air is drawn in from the outside through the air intake riser 3, and then enters the dust removal chamber 4. As the air passes through the filter plate 5 in the dust removal chamber 4, dust is trapped on the filter plate 5, resulting in clean, dust-free boiler combustion air entering the blower inlet. After being pressurized by the blower, the air enters the boiler to participate in combustion (see attached). Figure 1 In detail, the filter dust removal chamber 4 is shaped like a beer barrel. The enlarged local space inside the chamber facilitates the installation of the dust removal plate, while also increasing the cross-sectional area of ​​the boiler combustion air intake through the dust removal plate, reducing the flow velocity and thus reducing the air intake resistance.

[0031] During dust removal, the boiler combustion air intake is temporarily changed to direct indoor intake, instead of being drawn in from the outside through the air intake riser 3. Specifically: Open the dust removal air outlet 9 and close the dust removal air valve 8, maintaining uninterrupted normal boiler operation during this process. Open the dust removal port 6 and the purge port 7, first using compressed air to purge the accumulated dust on the dust removal plate for preliminary cleaning. The dust is manually removed through the dust removal port 6, and clean water is sprayed onto the dust removal plate through the purge port 7 for repeated rinsing until the water is clear. Then, manually clean the bottom of the filter dust removal chamber 4 until it is clean and dry. Finally, open the dust removal air valve 8 and close the dust removal air outlet 9 to restore normal operation (see attached). Figure 2 ).

[0032] The purpose of the insect net 2 is to prevent outdoor insects and birds from entering the filter and dust removal chamber 4 with the airflow, which could cause operational malfunctions. The insect net 2 can be made of rust-proof metal wire mesh or galvanized welded wire mesh, with a wire diameter of not less than 1.5 mm and a mesh area of ​​not more than 9 square millimeters.

[0033] The outer frame of filter plate 5 is made of aluminum alloy and is fixed to the dust removal chamber 4, serving as the overall structural frame of filter plate 5. The wire mesh acts as the backbone of the fiber filter cloth, preventing deformation during cleaning. The fiber filter cloth is made of high-flux, low-resistance chemical fiber cloth (such as polyester PET and polypropylene PP), filtering airborne dust particles with a diameter of no less than 11 micrometers, meeting the primary filtration level required in air treatment.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gas-fired boiler inlet air filtration and dust removal system, characterized in that, Air inlet riser, filter dust removal chamber, filter plate, dust removal port, blowout port, dust removal damper, dust removal air outlet. The end of the air inlet riser is connected to the air inlet of the filter dust removal chamber, and a dust removal port is opened on the side of the lower end of the filter dust removal chamber. The side of the filtration and dust removal chamber is connected to an air duct, and the air duct is isolated from the filtration and dust removal chamber by the filter plate. The blow-out port is provided on the side of the cavity, and the blow-out port is close to the upper end of the filter plate and close to the air inlet of the dust removal chamber. The dust removal valve is installed on the duct, the air outlet of the duct is connected to the fan, and the dust removal air outlet is opened on the duct body between the dust removal valve and the fan.

2. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, The lower edge of the duct extends into the cavity of the filtration and dust removal chamber without contacting the other side of the cavity. The upper edge of the duct is smoothly connected to the side of the cavity. The filter plate is installed between the lower edge and the side of the cavity.

3. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, It also includes an umbrella-shaped rain cap that covers the opening of the air intake riser.

4. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, It also includes an insect-proof net, which is riveted / welded / clipped to the inlet of the air inlet riser.

5. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, The dust removal air vent is an opening and closing door composed of an iron plate, hinges, and rubber pads.

6. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, The dust removal air outlet is a detachable fixed seal consisting of a steel blind flange and bolts.

7. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, The filtration and dust removal chamber is made of welded steel plates, and its connection with the blowing port and the dust removal port is a cavity pipe formed by connecting short metal pipes and welding them with flanges.

8. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, The dust removal valve is a steel rubber-sealed butterfly valve, and the flange at the connection between the dust removal valve and the filter dust removal chamber is fastened with bolts.

9. The gas-fired boiler inlet air filtration and dust removal system according to claim 1, characterized in that, The filter plate is composed of an outer frame, a single layer of steel wire mesh, and a fiber filter cloth stacked together.

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