Flue gas pre-dedusting system for industrial solid waste incineration circulating fluidized bed boiler

Abstract

The utility model discloses a flue gas pre-dedusting system for an industrial solid waste incineration circulating fluidized bed boiler, which belongs to the technical field of boiler flue gas treatment and comprises a cloth bag dedusting system and a ceramic tube dedusting system. An air inlet port is formed in one side of the bag-type dust removal box body in the width direction, and an exhaust port is formed in the top end of the bag-type dust removal box body; the ceramic tube dust removal system comprises a plurality of ceramic tube dust removal box bodies which are symmetrically arranged along the center line of the ceramic tube dust removal system; an air inlet pipeline and an exhaust pipeline are arranged along the center line of the ceramic pipe dust removal system, the inlet end of the air inlet pipeline is in sealed connection with the exhaust port, the lower side of the air inlet pipeline is communicated with the ceramic dust collection bins correspondingly arranged on the two sides of the air inlet pipeline through air inlet branch pipes, and the exhaust pipeline is communicated with the ceramic pipe dust removal boxes correspondingly arranged on the two sides of the exhaust pipeline. According to the utility model, the amount of dust entering a subsequent dust removal system can be greatly reduced, so that the amount of dust as hazardous wastes and the hazardous waste treatment cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas treatment, in particular to a flue gas pre-dust removal system for an industrial solid waste incineration circulating fluidized bed boiler. Background Art

[0002] The selection of flue gas treatment process for industrial solid waste incineration directly affects the stable operation of the system and the compliance of emissions. Domestic industrial solid waste incineration projects mainly refer to the mature flue gas treatment technology of the domestic waste incineration industry to ensure that boiler flue gas pollutant emissions meet the "Pollution Control Standards for Domestic Waste Incineration" (GB18485-2014). The existing boiler flue gas treatment process is: SNCR furnace denitrification + semi-dry deacidification + dry deacidification + activated carbon adsorption + bag filter.

[0003] The difference between industrial solid waste incineration and domestic waste incineration is that the fly ash produced by general industrial solid waste incineration does not belong to the hazardous wastes in the "National List of Hazardous Wastes (2021 Edition)" and other regulations, and the waste activated carbon produced by waste gas treatment during solid waste incineration and disposal is a hazardous waste. In general, industrial solid waste fuels contain a large amount of heavy metals and plastic components, and the flue gas after combustion contains a large amount of heavy metals and dioxins. Therefore, it is necessary to arrange activated carbon before the bag filter to adsorb and remove heavy metals and dioxins in the flue gas. At this time, the fly ash collected from the bag filter is basically a hazardous waste. On the one hand, many places directly manage the fly ash collected by the bag filter as hazardous waste during environmental impact assessment. On the other hand, even if these fly ashes are identified for hazardous characteristics, they will be judged as hazardous wastes because of the high probability of exceeding the standard for heavy metals or dioxins. Considering that the amount of fly ash in the flue gas of circulating fluidized bed boilers is relatively large, a large amount of fly ash is chelated and solidified as hazardous waste and then landfilled, resulting in a high operating cost for general industrial solid waste incineration projects, which directly affects the economic feasibility of the project. Utility Model Content

[0004] Technical problem to be solved: In order to solve the problem of increased treatment costs caused by the large amount of fly ash generated during the incineration of general industrial solid waste, the utility model provides a flue gas pre-dust removal system for a circulating fluidized bed boiler for industrial solid waste incineration, which performs pre-dust removal before entering the activated carbon adsorption, thereby greatly reducing the amount of dust entering the subsequent dust removal system, and further reducing the amount of dust as hazardous waste, thereby reducing the cost of hazardous waste treatment.

[0005] Technical solution: The utility model discloses a flue gas pre-dust removal system for a circulating fluidized bed boiler for industrial solid waste incineration, the flue gas pre-dust removal system comprising a bag dust removal system and a ceramic tube dust removal system;

[0006] The bag dust removal system comprises a plurality of groups of bag dust removal boxes arranged side by side, one side of the bag dust removal box is provided with an air inlet port along its width direction, and the top of the bag dust removal box is provided with an exhaust port;

[0007] The ceramic tube dust removal system includes a plurality of ceramic tube dust removal boxes symmetrically arranged along its midline, and a ceramic dust collecting bin is arranged at the lower end of each ceramic tube dust removal box; an air inlet duct and an exhaust duct are arranged in parallel from bottom to top along the midline of the ceramic tube dust removal system, the inlet end of the air inlet duct is sealed and connected to the exhaust port of the bag dust removal box, and the lower side of the air inlet duct is connected to the ceramic dust collecting bins correspondingly arranged on both sides thereof through air inlet branches, and the exhaust duct is connected to the ceramic tube dust removal boxes correspondingly arranged on both sides thereof.

[0008] Preferably, an air inlet guide plate is arranged in the bag dust removal box corresponding to the air inlet port.

[0009] Preferably, a plurality of ceramic tube mounting positions are evenly arranged on the top of the ceramic tube dust removal box, and each ceramic tube mounting position corresponds to a mounting plate. The mounting plate is provided with a plurality of mounting holes and corresponding ceramic tubes inserted in the mounting holes, and the top of the ceramic tube is pressed against the mounting plate by a clamping ring plate.

[0010] Preferably, a clearance cavity connected to the exhaust duct is provided on the upper part of the ceramic tube dust removal box, and a plurality of back-blowing air pipes are provided in the clearance cavity along the length direction of the ceramic tube dust removal box, and the air outlets of the back-blowing air pipes are arranged corresponding to the ceramic tubes.

[0011] Preferably, each back-blowing air pipe is provided with a pulse valve, and each pulse valve is connected to a high-pressure air tank through an air transmission pipeline.

[0012] Preferably, a plurality of pneumatic shut-off valves are correspondingly arranged at the top of the ceramic tube dust removal system along the direction of the exhaust duct.

[0013] Preferably, a rain shelter is provided at the top of the ceramic tube dust removal system along its center line.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The utility model arranges a flue gas pre-dust removal system in front of the bag dust collector for flue gas treatment of a general industrial solid waste incineration circulating fluidized bed boiler, and adopts a bag dust removal system and a ceramic tube dust removal system to remove more than 70% of fly ash in the flue gas, thereby reducing the amount of hazardous waste of boiler fly ash; compared with the conventional dust removal process of a general industrial solid waste circulating fluidized bed boiler, the main process flow of boiler flue gas purification is: SNCR furnace denitrification + semi-dry deacidification + dry deacidification + flue gas pre-dust removal system + activated carbon adsorption + bag dust collector;

[0016] 2. The fly ash collected by the flue gas pre-dust removal system can be used as general waste for comprehensive resource utilization;

[0017] 3. The amount of boiler fly ash collected in the bag filter by activated carbon adsorption is greatly reduced, the cost of hazardous waste disposal is low, and the economic benefits of the project are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the flue gas pre-dust removal system of the utility model;

[0019] Figure 2 for Figure 1 AA structural section view of the middle bag dust removal system;

[0020] Figure 3 for Figure 1 The BB structural section view of the middle ceramic tube dust removal system;

[0021] Figure 4 for Figure 1 Top view of the structure of the flue gas pre-dust removal system;

[0022] Figure 5 for Figure 1 Schematic diagram of the ceramic tube installation structure.

[0023] Figure numerals: 100, flue gas pre-dust removal system; 1, bag dust removal system; 11, bag dust removal box; 12, air inlet port; 13, bag dust collecting bin; 14, exhaust port; 15, air inlet guide plate; 2, ceramic tube dust removal system; 21, ceramic tube dust removal box; 22, ceramic dust collecting bin; 23, air inlet duct; 24, exhaust duct; 25, pneumatic shut-off valve; 26, pulse valve; 27, awning; 28, air inlet branch pipe; 29, high-pressure air tank; 210, ceramic tube installation position; 211, back-blowing air duct; 212, mounting plate; 213, clamping ring plate; 214, ceramic tube. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figures 1 to 5 The technical scheme of the embodiment of the utility model is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the utility model.

[0025] like Figure 1~2As shown, the utility model is a flue gas pre-dust removal system for industrial solid waste incineration circulating fluidized bed boilers, the flue gas pre-dust removal system 100 includes a bag dust removal system 1 and a ceramic tube dust removal system 2; the bag dust removal system 1 includes a plurality of bag dust removal boxes 11 arranged side by side, and a bag dust collection bin 13 is arranged at the bottom of each bag dust removal box 11; an air inlet port 12 is arranged on one side of the bag dust removal box 11 along its width direction, and an air inlet guide plate 15 is arranged in the bag dust removal box 11 corresponding to the air inlet port 12, and the dust-containing flue gas can extend the flue gas pre-dust removal time when flowing through the air inlet guide plate 15 through the air inlet port 12, thereby improving the pre-dust removal efficiency; an exhaust port 14 is arranged at the top of the bag dust removal box 11, and the dust-containing flue gas is discharged through the exhaust port 14 after dust removal. It should be noted that the arrangement of the dust removal bags in the bag dust removal box 11 belongs to the conventional setting, which will not be repeated here.

[0026] like Figure 1 and Figure 3~4 As shown, the ceramic tube dust removal system 2 includes a plurality of ceramic tube dust removal boxes 21 symmetrically arranged along the midline, and a ceramic dust collection bin 22 is arranged at the lower end of each ceramic tube dust removal box 21, and the dust collected in the ceramic dust collection bin 22 can be discharged through its lower end. An air inlet duct 23 and an air exhaust duct 24 are arranged in parallel from bottom to top along the midline of the ceramic tube dust removal system 2, and the inlet end of the air inlet duct 23 is sealed and connected to the exhaust port 14 of the bag dust removal box 11, and the lower side of the air inlet duct 23 is connected to the ceramic dust collection bin 22 correspondingly arranged on both sides thereof through the air inlet branch pipe 28, and the air inlet branch pipe 28 is connected to a control valve to control the activation or deactivation of the corresponding ceramic tube dust removal box 21; the exhaust duct 24 is connected to the ceramic tube dust removal boxes 21 correspondingly arranged on both sides thereof. A plurality of pneumatic shut-off valves 25 are provided at the top of the ceramic tube dust removal system 2 along the exhaust duct 24. Each pneumatic shut-off valve 25 can control the connection or disconnection of the ceramic tube dust removal box 21, thereby controlling the number of working ceramic tube dust removal boxes 21, and thus controlling the optimal dust removal efficiency of the ceramic tube dust removal system 2. Compared with the conventional dust removal process of general industrial solid waste circulating fluidized bed boilers, the main process flow of boiler flue gas purification is: SNCR furnace denitrification + semi-dry deacidification + dry deacidification + flue gas pre-dust removal system + activated carbon adsorption + bag filter; a flue gas pre-dust removal system is arranged in front of the bag filter of the flue gas treatment of the general industrial solid waste incineration circulating fluidized bed boiler, and the bag filter system and the ceramic tube dust removal system are used to remove more than 70% of the fly ash in the flue gas, reducing the amount of boiler fly ash hazardous waste. The fly ash collected by the flue gas pre-dust removal system can be used as general waste for comprehensive resource utilization. The amount of boiler fly ash collected in the bag filter after activated carbon adsorption is greatly reduced, the cost of hazardous waste disposal is low, and the economic benefits of the project are improved.

[0027] like Figures 3-5As shown, the top of the ceramic tube dust removal box 21 is evenly provided with a plurality of ceramic tube mounting positions 210, each ceramic tube mounting position 210 is correspondingly provided with a mounting plate 212, the mounting plate 212 is provided with a plurality of mounting position holes and a ceramic tube 214 correspondingly plugged into the mounting position hole, the top of the ceramic tube 214 is pressed on the mounting plate 212 by a clamping ring plate 213, and the tube wall of the ceramic tube 214 is provided with a plurality of air holes for gas to pass through and limit the passage of dust particles, thereby achieving the purification and filtration of dust-containing flue gas. The upper part of the ceramic tube dust removal box 21 is provided with a clearance cavity connected to the exhaust duct 24, and a plurality of back-blowing air pipes 211 are provided in the clearance cavity along the length direction of the ceramic tube dust removal box 21, and the air outlet of the back-blowing air pipe 211 is correspondingly provided with the ceramic tube 214, and each back-blowing air pipe 211 is provided with a pulse valve 26, and each pulse valve 26 is connected to the high-pressure air tank 29 through the gas pipeline. During operation, the high-pressure gas stored in the high-pressure air tank 29 can pass through the pulse valve 26 and periodically blow high-pressure air to the ceramic tube 214 through the back-blowing pipe 211, thereby achieving periodic purification of the ceramic tube 214 and improving the dust removal efficiency and service life of the ceramic tube dust removal box 21.

[0028] like Figure 3 As shown, a rain shelter 27 is provided at the top of the ceramic tube dust removal system 2 along its center line, and the rain shelter 27 can protect the pneumatic shut-off valve 25 and the pulse valve 26 from rain.

[0029] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A flue gas pre-dust removal system for a circulating fluidized bed boiler for industrial solid waste incineration, characterized in that: The flue gas pre-dust removal system (100) comprises a bag dust removal system (1) and a ceramic tube dust removal system (2); The bag dust removal system (1) comprises a plurality of groups of bag dust removal boxes (11) arranged side by side, an air inlet port (12) being arranged on one side of the bag dust removal box (11) along its width direction, and an exhaust port (14) being arranged on the top of the bag dust removal box (11); The ceramic tube dust removal system (2) comprises a plurality of ceramic tube dust removal boxes (21) symmetrically arranged along the midline thereof, and a ceramic dust collecting bin (22) is arranged at the lower end of each ceramic tube dust removal box (21); an air inlet duct (23) and an air exhaust duct (24) are arranged in parallel from bottom to top along the midline of the ceramic tube dust removal system (2), the inlet end of the air inlet duct (23) being sealedly connected to the exhaust port (14) of the bag dust removal box (11), and the lower side of the air inlet duct (23) is connected to the ceramic dust collecting bins (22) arranged correspondingly on both sides thereof through air inlet branch pipes (28), and the air exhaust duct (24) is connected to the ceramic tube dust removal boxes (21) arranged correspondingly on both sides thereof.

2. The flue gas pre-dust removal system for an industrial solid waste incineration circulating fluidized bed boiler according to claim 1, characterized in that: An air inlet guide plate (15) is arranged in the bag dust removal box (11) corresponding to the air inlet port (12).

3. The flue gas pre-dust removal system for an industrial solid waste incineration circulating fluidized bed boiler according to claim 1, characterized in that: The top of the ceramic tube dust removal box (21) is evenly provided with a plurality of ceramic tube mounting positions (210), each ceramic tube mounting position (210) is correspondingly provided with a mounting plate (212), the mounting plate (212) is provided with a plurality of mounting position holes and ceramic tubes (214) correspondingly inserted into the mounting position holes, and the top of the ceramic tube (214) is pressed onto the mounting plate (212) via a pressing ring plate (213).

4. The flue gas pre-dust removal system for an industrial solid waste incineration circulating fluidized bed boiler according to claim 3, characterized in that: A clear cavity connected to the exhaust duct (24) is arranged at the upper part of the ceramic tube dust removal box (21), and a plurality of back-blowing air pipes (211) are arranged in the clear cavity along the length direction of the ceramic tube dust removal box (21), and the air outlets of the back-blowing air pipes (211) are arranged corresponding to the ceramic tubes (214).

5. The flue gas pre-dust removal system for an industrial solid waste incineration circulating fluidized bed boiler according to claim 4, characterized in that: Each back-blowing air pipe (211) is provided with a pulse valve (26), and each pulse valve (26) is connected to a high-pressure air tank (29) via an air transmission pipeline.

6. The flue gas pre-dust removal system for an industrial solid waste incineration circulating fluidized bed boiler according to claim 3, characterized in that: A plurality of pneumatic closing valves (25) are correspondingly arranged at the top end of the ceramic tube dust removal system (2) along the direction of the exhaust duct (24).

7. The flue gas pre-dust removal system for an industrial solid waste incineration circulating fluidized bed boiler according to any one of claims 1 to 6, characterized in that: A rain shelter (27) is provided at the top end of the ceramic tube dust removal system (2) along its center line.

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