Flue gas purification device

Abstract

The flue gas purification device provided by the present invention can evenly distribute dry powder materials within the chambers of a dry process reaction device, ensuring that more dry powder materials participate in the reaction and reducing material waste. Each chamber is independently provided with a diverging dry powder injector, with the diverging dry powder injector's spray direction set to the reaction area within the chamber, ensuring that each chamber receives dry powder materials evenly. The diverging dry powder injector also ensures that the dry powder materials are evenly sprayed into the reaction area within each chamber by evenly distributing nozzles on a dispersion pipe in the shape of an annular pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas purification devices, in particular to a flue gas purification device. Background Art

[0002] In the deacidification treatment of flue gas in municipal waste incineration power plants, a combination of deacidification technology and processes is usually adopted, mainly including semi-dry method + dry method, dry method + wet method, semi-dry method + wet method and other combined processes. Among them, the dry system is a very important component of the flue gas deacidification treatment process. Commonly used dry systems such as bag dust collectors usually use dry powder injection devices to use slaked lime or sodium hydroxide as reactants (hereinafter referred to as dry powder), and inject the dry powder into the dust collector inlet flue. The dry powder is brought into the dust collector chamber by the flue gas at the dust collector inlet for reaction. The dry powder injection device in the prior art is usually installed at the total inlet of the flue gas. Such as Figure 1 As shown, the bag filter 1 includes six chambers 1-1, and the flue gas channel 2 includes a smoke inlet channel and a smoke outlet channel that are isolated from each other. The smoke inlet channel has a smoke inlet 2-1 at one end and is closed at the other end, and is connected to each chamber through a smoke inlet branch pipe 2-3. The smoke outlet channel has a smoke outlet 2-2 at one end and is closed at the other end, and is connected to each chamber 1-1 through a smoke outlet branch pipe 2-4. An induced draft fan (not marked in the figure) is provided on one side of the smoke outlet of the smoke outlet channel.

[0003] The dry powder injection device 3 is installed on the inner side of the smoke inlet 2-1 of the smoke inlet channel. The dry powder injected by the dry powder injection device 3 enters each chamber 1-1 through the smoke inlet branch pipe 2-3 along with the smoke. The dry powder reacts with the smoke in the chamber 1-1, and then the purified smoke enters the smoke guide channel (not marked in the figure) from the smoke outlet branch pipe 2-4 of each chamber 1-1 and is guided out from the smoke outlet 2-2 to the downstream smoke treatment equipment.

[0004] However, in the prior art, the dry powder sprayed by the dry powder injection device 3 arranged on the inner side of the flue gas inlet 2-1 enters each chamber along with the flue gas. As the equipment is used and the flue gas flow rate changes, there are problems such as uneven distribution of dry powder materials entering each dust collector chamber, insufficient reaction, and material waste, which in turn leads to the problem that the flue gas emission indicators cannot be stably controlled. Summary of the Invention

[0005] In order to solve the problems of uneven distribution of dry powder materials entering each dust collector chamber, insufficient reaction, and material waste in the dry reaction system in the prior art, the present invention provides a flue gas purification device, which can make the dry powder materials evenly distributed in the chamber of the dry reaction device, ensuring that more dry powder materials participate in the reaction and reducing material waste.

[0006] The structure of the present invention is as follows: a flue gas purification device, comprising: a chamber, a flue gas channel, and a dry powder injection structure; the flue gas channel comprises a smoke inlet channel and a smoke outlet channel, which are isolated from each other; one end of the smoke inlet channel is a smoke inlet, the other end is closed, and each of the chambers is connected via a smoke inlet branch pipe; one end of the smoke outlet channel is a smoke outlet, the other end is closed, and each of the chambers is connected via a smoke outlet branch pipe; an induced draft fan is provided on one side of the smoke outlet of the smoke outlet channel;

[0007] The invention is characterized in that: the dry powder injection structure comprises: a venturi tube, a dry powder feeding valve and a circular divergent dry powder injector; the divergent dry powder injector is respectively arranged above the position of the smoke inlet branch pipe in each of the chambers;

[0008] The venturi tube includes: a material input pipe, a compressed air acceleration pipe, a mixed material discharge pipe and a mixing chamber; the material input pipe, the compressed air acceleration pipe and the mixed material discharge pipe are arranged on the mixing chamber and are respectively connected to the inner cavity of the mixing chamber;

[0009] The compressed air accelerating tube is a triangular cone tube, the wider end of which is connected to the compressed air supply device, and the narrower end is inserted into the inner cavity of the mixing chamber;

[0010] One end of the material input pipe is connected to the dry powder feeding device through the dry powder feeding valve, and the other end is connected to the inner cavity of the mixing chamber;

[0011] The mixed material discharge pipe is arranged on a side of the mixing chamber opposite to the compressed air acceleration pipe, and the central axes of the mixed material discharge pipe and the compressed air acceleration pipe are located on the same straight line;

[0012] Each of the diverging dry powder injectors is connected to the mixed material discharge pipe via a dry powder delivery pipe;

[0013] The spraying direction of the divergent dry powder injector is toward the reaction area in the chamber;

[0014] The divergent dry powder injector includes: a nozzle, a feed port and a dispersion pipe. The dispersion pipe is a ring-shaped pipe structure. The nozzles are evenly arranged along the circumference of the dispersion pipe. The dispersion pipe is connected to the dry powder delivery pipe through the feed port.

[0015] It is further characterized by:

[0016] The material input pipe includes a feed pipe and a guide pipe that are connected to each other, one end of the feed pipe is connected to the dry powder feeding device through the dry powder feeding valve, and the other end is connected to one end of the guide pipe, and one end of the guide pipe is connected to the inner cavity of the mixing chamber;

[0017] A guide angle A is set between the central axis of the guide tube and the feed tube, and the guide angle A ensures that the extended axis of the guide tube is located between the compressed air acceleration tube and the mixed material discharge tube in the inner cavity of the mixing chamber;

[0018] The dispersed dry powder sprayer further includes: a material guide pipe and a material guide branch pipe, each of the material guide pipes being an annular pipe structure, the diameter of the dispersion pipe being larger than the diameter of the material guide pipe; the dispersion pipe and the material guide pipe being concentrically arranged in upper and lower layers, and being connected via the straight material guide branch pipe; the material guide pipe being connected to the feed port;

[0019] It also includes: a solid flow meter and a chamber flue gas analyzer; the solid flow meter is arranged on the dry powder conveying pipeline; the chamber flue gas analyzer is arranged inside each of the chambers.

[0020] The flue gas purification device provided by the present invention independently arranges a divergent dry powder injector inside each chamber, and the spray direction of the divergent dry powder injector is set to the reaction area in the chamber, thereby ensuring that each chamber can evenly obtain dry powder material; the divergent dry powder injector ensures that inside each chamber, the dry powder material can also be evenly sprayed into the reaction area by evenly arranging nozzles on a dispersion pipe in the shape of an annular pipe, further making the dry powder material evenly distributed in the dry reaction device, ensuring that more dry powder material participates in the reaction, and reducing material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a dry process system in the prior art;

[0022] Figure 2 It is a structural schematic diagram of an embodiment of a flue gas purification device in the present invention;

[0023] Figure 3 Schematic diagram of the structure of the chamber of the bag filter in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the main structure of the divergent dry powder injector of the present invention;

[0025] Figure 5 for Figure 4 A schematic diagram of the structure from a top view;

[0026] Figure 6 Schematic diagram of the structure of the Venturi tube. DETAILED DESCRIPTION

[0027] The present invention includes a flue gas purification device, such as Figure 2 and Figure 3As shown, the flue gas purification device includes: a chamber 1-1 and a flue gas channel 2, the flue gas channel 2 includes a smoke inlet channel (not marked in the figure) and a smoke outlet channel (not marked in the figure) that are isolated from each other; one end of the smoke inlet channel is a smoke inlet 2-1, and the other end is closed, and is connected to each chamber 1-1 through a smoke inlet branch pipe 2-3; one end of the smoke outlet channel is a smoke outlet 2-2, and the other end is closed, and is connected to each chamber 1-1 through a smoke outlet branch pipe 2-4; a draft fan (not marked in the figure) is arranged on one side of the smoke outlet 2-2 of the smoke outlet channel.

[0028] The dry powder spraying structure of the present invention is independently arranged for each chamber, and the divergent dry powder sprayer 4 for dry powder spraying is respectively arranged inside each chamber 1-1, so as to ensure that the dry powder material can be evenly sprayed in each chamber 1-1.

[0029] by Figure 2 Taking the bag dust collector as an example, the dry powder injection structure includes: a venturi tube 6, a dry powder feeding valve 8, a circular divergent dry powder injector 4 and a conveying fan 9; the divergent dry powder injector 4 is respectively arranged above the position of the smoke inlet branch pipe 2-3 in each chamber 1-1 to ensure that the smoke entering from the smoke branch pipe 2-3 is mixed with the material injected from the divergent dry powder injector 4 on the way to the bag reaction area above.

[0030] like Figure 6 As shown, the venturi tube 6 includes: a material input pipe 6-1, a compressed air acceleration pipe 6-4, a mixed material discharge pipe 6-2 and a mixing chamber 6-3; the material input pipe 6-1, the compressed air acceleration pipe 6-4 and the mixed material discharge pipe 6-2 are arranged on the mixing chamber 6-3 and are respectively connected to the inner cavity of the mixing chamber 6-3;

[0031] The compressed air accelerating tube 6 - 4 is a triangular cone-shaped tube, the wider end of which is connected to the compressed air supply device, and the narrower end is inserted into the inner cavity of the mixing chamber 6 - 3 ; in this embodiment, the compressed air supply device is realized based on the conveying fan 9 .

[0032] One end of the material input pipe 6-1 is connected to the dry powder feeding device through the dry powder feeding valve 8, and the other end is connected to the inner cavity of the mixing chamber 6-3;

[0033] The mixed material discharge pipe 6-2 is arranged on the side of the mixing chamber 6-3 opposite to the compressed air acceleration pipe 6-4, and the central axis of the mixed material discharge pipe 6-2 and the compressed air acceleration pipe 6-4 are located on the same straight line. Each diverging dry powder injector 4 is connected to the mixed material discharge pipe 6-2 through a dry powder delivery pipe 5.

[0034] After the dry powder enters the inner cavity of the mixing chamber 6-3 through the material input pipe 6-1, it is blown into the mixed material discharge pipe 6-2 by the high-speed compressed air entering through the compressed air acceleration pipe 6-4, and then delivered to the diverging dry powder injector 4 through the dry powder conveying pipe 5. Since the high-speed compressed air is introduced into the inner cavity of the mixing chamber 6-3 through the compressed air acceleration pipe 6-4, it is fully mixed with the dry powder and then blown into the dry powder conveying pipe 5. This ensures that the dry powder can enter the diverging dry powder injector 4 evenly, without clogging the equipment, and can evenly mix and react with the flue gas.

[0035] The material input pipe 6-1 includes a feed pipe 6-11 and a guide pipe 6-12 that are interconnected. One end of the feed pipe 6-11 is connected to the dry powder feeding device through the dry powder feeding valve 8, and the other end is connected to one end of the guide pipe 6-12. One end of the guide pipe 6-12 is connected to the inner cavity of the mixing chamber 6-3.

[0036] A guide angle A is set between the central axis of the guide tube 6-12 and the feed tube 6-11, and the guide angle A ensures that the extended axis of the guide tube 6-12 is located between the compressed air acceleration tube 6-4 and the mixed material discharge tube 6-2 in the inner cavity of the mixing chamber 6-3.

[0037] The dry powder material is guided to the position between the compressed air acceleration tube 6-4 and the mixed material discharge tube 6-2 through the guide tube 6-12, thereby reducing the probability of material accumulation in the inner cavity of the mixing chamber 6-3. After the dry powder material enters the position between the compressed air acceleration tube 6-4 and the mixed material discharge tube 6-2, it is immediately blown by high-speed compressed air into the mixed material discharge tube 6-2 which is in the same straight line as the central axis of the compressed air acceleration tube 6-4.

[0038] The spray direction of the divergent dry powder injector 4 is toward the reaction area 1-2 in the chamber 1-1. In this embodiment, the reaction area 1-2 in the bag filter is the bag area in each chamber 1-1. This ensures that the dry powder material can be evenly sprayed in the bag area and can fully react with the flue gas.

[0039] The dry powder material in the dry powder feeding device is transported to the venturi tube 6 through the opening and closing control of the dry powder feeding valve 8, and then blown into the dry powder conveying pipeline 5 from the venturi tube 6 through high-speed grinding air, and then sent to the diverging dry powder injector 4.

[0040] like Figure 4 and 5As shown, the divergent dry powder injector 4 includes: a nozzle 4-4, a feed port 4-1, a dispersion pipe 4-3, a material guide pipe 4-2 and a material guide branch pipe 4-5; the dispersion pipe 4-3 and the material guide pipe 4-2 are both annular pipe structures, the diameter of the dispersion pipe 4-3 is larger than the diameter of the material guide pipe 4-2, the dispersion pipe 4-3 and the material guide pipe 4-2 are concentrically arranged in the upper and lower layers, and the two are connected by a straight pipe type material guide branch pipe 4-5;

[0041] Nozzles 4 - 4 are evenly arranged along the circumference of the dispersion pipe 4 - 3 , the material guide pipe 4 - 2 is connected to the feed port 4 - 1 , and the feed port 4 - 1 is connected to the dry powder conveying pipeline 5 .

[0042] The dry powder material mixed with compressed air in the dry powder delivery pipe 5 enters the material guide pipe 4-2 through the feed port 4-1, then enters the annular material guide pipe 4-2. It then passes through the material guide branch pipes 4-5 evenly arranged on the material guide pipe 4-2 and enters the dispersion pipe 4-3 before being ejected from the nozzle 4-4. In practice, the nozzle 4-4 can be an existing nozzle with a diverging function, such as a conical nozzle. The dry powder material entering the dry powder delivery pipe 5 is evenly sprayed by the diverging dry powder injector 4 into the reaction zone 1-2 within the chamber, ensuring that the dry powder material fully reacts with the flue gas.

[0043] During implementation, a solid flow meter 7 can be set on the dry powder conveying pipeline 5; a chamber flue gas analyzer 10 can be set inside each chamber 1-1; the HCL and SO2 contents in the flue gas inside each chamber can be monitored by the flue gas analyzer 10, and then the dry powder injection amount of each chamber can be detected in real time by the solid flow meter 7 to confirm whether the amount of dry powder material distributed in each chamber is appropriate. If adjustment is needed, the dry powder injection amount of each chamber can be adjusted by the dry powder feeding valve 8 to further control the feeding accuracy of each chamber and reduce material waste.

[0044] After using the technical solution of the present invention, the distributed dry powder injection form is realized by the divergent dry powder injector 4 to feed each chamber separately, ensuring that each chamber can obtain suitable dry powder materials and avoiding material waste; the divergent dry powder injector is used to ensure that the reaction area 1-2 of each chamber can be evenly sprayed with dry powder materials, further reducing material waste; the use of this thoughtful technical solution not only avoids material waste, but also reduces the amount of fly ash generated, thereby reducing material consumption costs and subsequent fly ash treatment costs.

Claims

1. A flue gas purification device comprising: A chamber, a smoke channel and a dry powder injection structure, wherein the smoke channel includes a smoke inlet channel and a smoke outlet channel that are isolated from each other; One end of the smoke inlet channel is a smoke inlet, and the other end is closed, and is connected to each of the chambers through a smoke inlet branch pipe; one end of the smoke outlet channel is a smoke outlet, and the other end is closed, and is connected to each of the chambers through a smoke outlet branch pipe; an induced draft fan is provided on one side of the smoke outlet of the smoke outlet channel; The invention is characterized in that: the dry powder injection structure comprises: a venturi tube, a dry powder feeding valve and a circular divergent dry powder injector; the divergent dry powder injector is respectively arranged above the position of the smoke inlet branch pipe in each of the chambers; The venturi tube includes: a material input pipe, a compressed air acceleration pipe, a mixed material discharge pipe and a mixing chamber; the material input pipe, the compressed air acceleration pipe and the mixed material discharge pipe are arranged on the mixing chamber and are respectively connected to the inner cavity of the mixing chamber; The compressed air accelerating tube is a triangular cone tube, the wider end of which is connected to the compressed air supply device, and the narrower end is inserted into the inner cavity of the mixing chamber; One end of the material input pipe is connected to the dry powder feeding device through the dry powder feeding valve, and the other end is connected to the inner cavity of the mixing chamber; The mixed material discharge pipe is arranged on a side of the mixing chamber opposite to the compressed air acceleration pipe, and the central axes of the mixed material discharge pipe and the compressed air acceleration pipe are located on the same straight line; Each of the diverging dry powder injectors is connected to the mixed material discharge pipe via a dry powder delivery pipe; The spraying direction of the divergent dry powder injector is toward the reaction area in the chamber; The divergent dry powder injector comprises: a nozzle, a feed port and a dispersion pipe, wherein the dispersion pipe is an annular pipe structure, the nozzles are evenly arranged along the circumference of the dispersion pipe, and the dispersion pipe is connected to the dry powder delivery pipe through the feed port; The material input pipe includes a feed pipe and a guide pipe that are connected to each other, one end of the feed pipe is connected to the dry powder feeding device through the dry powder feeding valve, and the other end is connected to one end of the guide pipe, and one end of the guide pipe is connected to the inner cavity of the mixing chamber; A guide angle A is set between the central axis of the guide tube and the feed tube, and the guide angle A ensures that the extended axis of the guide tube is located between the compressed air acceleration tube and the mixed material discharge tube in the inner cavity of the mixing chamber; It also includes: a solid flow meter and a chamber flue gas analyzer; the solid flow meter is arranged on the dry powder conveying pipeline; the chamber flue gas analyzer is arranged inside each of the chambers.

2. The flue gas purification device according to claim 1, characterized in that: The diverging dry powder sprayer also includes: a material guide pipe and a material guide branch pipe, each of the material guide pipes is an annular pipe structure, and the diameter of the dispersion pipe is larger than the diameter of the material guide pipe; the dispersion pipe and the material guide pipe are concentrically arranged in the upper and lower layers, and are connected by the straight pipe type material guide branch pipe; the material guide pipe is connected to the feed port.

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