Exhaust gas desulfurization system

Abstract

The utility model relates to the technical field of heating equipment, provide a dry desulfurization system outside furnace, and the system includes feeding device, conveying pipeline, desulfurization induced draft fan and leakage prevention air supply device. The dry desulfurization system outside furnace provided by the utility model passes through setting the feeding device loaded with desulfurizer, conveying pipeline and desulfurization induced draft fan, and desulfurization induced draft fan conveys desulfurizer to long flue through conveying pipeline, makes desulfurizer and high temperature flue gas in long flue fully contact and reaction reduction in the inside of long flue, thereby removes sulfur dioxide in flue gas, and the mixed flue gas after reaction with desulfurizer is pumped to chimney under the action of exhaust induced draft fan, and is discharged to the outside environment, makes sulfur dioxide removal effect more obvious, and the reaction is more sufficient, and it is not easy to lead to boiler part corrosion and perforation burst, and the leakage prevention air supply device is set up in the original boiler flue gas treatment line, and the leakage prevention air supply device is located at long flue, prevents flue gas leakage, and the investment cost is low and the operation cost is not high.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, specifically to an external dry desulfurization system. Background Technology

[0002] Biomass fuel generally refers to fuel made by burning biomass materials, mainly including agricultural and forestry waste, such as straw, sawdust, bagasse, and rice husks. Through processes such as crushing, mixing, extrusion, and drying, it can be made into various shapes (such as blocks and pellets) and is a new type of clean fuel that can be directly burned.

[0003] Currently, most biomass fuel boilers produce sulfur dioxide when burned. Direct emission of sulfur dioxide pollutes the environment and leads to failure to meet environmental emission standards.

[0004] To remove sulfur dioxide produced by the combustion of biomass fuel, a desulfurization device is usually installed and urea desulfurization substance is sprayed inside the boiler furnace, so that sulfur dioxide reacts with urea and is removed.

[0005] However, in the relevant sulfur dioxide removal technologies, the desulfurization substances do not react sufficiently with sulfur dioxide, resulting in poor desulfurization effect, which can easily lead to corrosion of boiler components and perforation and bursting; moreover, the investment and operating costs are high. Utility Model Content

[0006] In view of the above-mentioned defects in the prior art, this utility model provides an external dry desulfurization system to solve at least one of the above-mentioned technical defects in the prior art, so that the desulfurization substance reacts more fully with sulfur dioxide, the desulfurization effect is better, and it can prevent boiler components from being corroded and avoid perforation and bursting; moreover, the investment and operating costs are low.

[0007] To achieve the objectives of this utility model, an external dry desulfurization system is provided, comprising:

[0008] The feeding device is loaded with desulfurizing agent;

[0009] A conveying pipe, the first end of which is connected to the feeding device, and the second end of which is connected to the long flue;

[0010] A desulfurization induced draft fan, located in the conveying pipeline, provides power for conveying the desulfurizing agent from the feeding device to the long flue.

[0011] An air leakage prevention device is installed in the long flue and is suitable for preventing air leakage in the long flue.

[0012] Preferably, the feeding device includes a feeding hopper and a conveying device.

[0013] The feeding hopper has an inlet and an outlet, and the outlet is connected to the conveying device.

[0014] The conveying device is connected to the first end of the conveying pipeline.

[0015] Preferably, the conveying device is a variable frequency screw conveyor.

[0016] Preferably, the conveying pipeline includes a first conveying pipeline and a second conveying pipeline.

[0017] The first end of the first conveying pipe is connected to the conveying device, and the second end of the second conveying pipe is connected to the long flue.

[0018] The desulfurization induced draft fan is connected in series with the second end of the first conveying pipeline and the first end of the second conveying pipeline.

[0019] Preferably, the desulfurization induced draft fan has an induced draft inlet and an induced draft outlet.

[0020] The air inlet is connected to the second end of the first conveying pipe, and the air outlet is connected to the first end of the second conveying pipe.

[0021] The exhaust outlet is a spiral nozzle.

[0022] Preferably, the leak-proof air supply device includes a first air duct, a second air duct, and a leak-proof exhaust fan.

[0023] The first end of the first air duct is connected to the first end of the long flue.

[0024] The second end of the second air duct is connected to the second end of the long flue.

[0025] The leak-proof induced draft fan is connected in series between the second end of the first air duct and the first end of the second air duct.

[0026] Preferably, the boiler flue gas treatment line includes an air preheater and a multi-tube dust collector.

[0027] The long flue connects the air preheater and the multi-tube dust collector.

[0028] The first end of the long flue is close to the air preheater, and the second end of the long flue is close to the multi-tube dust collector.

[0029] Preferably, it also includes a control device and a flue gas detection element, wherein the flue gas detection element is disposed in the long flue.

[0030] The control device is electrically connected to the leak-proof induced draft fan, the desulfurization induced draft fan, and the flue gas detection device.

[0031] Preferably, both the anti-leakage induced draft fan and the desulfurization induced draft fan are variable frequency induced draft fans.

[0032] Preferably, the desulfurizing agent is quicklime or sodium bicarbonate.

[0033] The beneficial effects of this utility model are as follows: The external dry desulfurization system provided by this utility model, through the setting of a feeding device loaded with desulfurizing agent, a conveying pipeline and a desulfurization induced draft fan, uses the desulfurization induced draft fan to transport the desulfurizing agent through the conveying pipeline to the long flue of the boiler flue gas treatment line, so that the desulfurizing agent and the high temperature flue gas in the long flue can fully contact and react and reduce inside the long flue, thereby removing sulfur dioxide from the flue gas. The mixed flue gas after reacting with the desulfurizing agent is drawn to the chimney by the exhaust induced draft fan and discharged into the external environment, making the sulfur dioxide removal effect more obvious, the reaction more complete, and the desulfurization effect better, and less likely to cause corrosion, perforation and bursting of boiler components; moreover, the original boiler flue gas treatment line is equipped with a leak-proof air supply device, which is set at the long flue to prevent flue gas leakage, resulting in low investment cost and low operating cost. Attached Figure Description

[0034] The above and other objects, features, and advantages of this utility model will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this application.

[0035] Figure 1 A schematic diagram of the overall structure of the external dry desulfurization system provided in this embodiment of the utility model;

[0036] Figure 2 A schematic diagram showing the structural relationship between the feeding device, conveying pipeline, and desulfurization induced draft fan in the external dry desulfurization system provided in this embodiment of the utility model;

[0037] Figure 3 A schematic diagram of the anti-leakage air supply device in the external dry desulfurization system provided in this embodiment of the utility model.

[0038] 1. Boiler body; 2. Economizer; 3. Air preheater; 4. Multi-tube dust collector; 5. Bag filter dust collector; 6. Exhaust fan; 7. Chimney; 8. First end of long flue; 9. Second end of long flue;

[0039] 100. Feeding device; 110. Feeding hopper; 111. Feed inlet; 112. Discharge outlet; 120. Conveying device;

[0040] 200. Conveying pipeline; 210. First conveying pipeline; 220. Second conveying pipeline;

[0041] 300. Desulfurization induced draft fan; 310. Induced draft inlet; 320. Induced draft outlet;

[0042] 400. Leak-proof air supply device; 410. First air duct; 420. Second air duct; 430. Leak-proof exhaust fan. Detailed Implementation

[0043] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0044] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this applies. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] The following is combined Figures 1 to 3 The embodiments of this utility model will be described below. It should be understood that the following description is merely an illustrative embodiment of this utility model and does not constitute any limitation on this utility model.

[0047] Combination Figures 1 to 3 The present invention provides an external dry desulfurization system that can be installed in a boiler flue gas treatment line, such as a biomass boiler flue gas treatment line. This biomass boiler flue gas treatment line includes a boiler body 1, an economizer 2, an air preheater 3, a multi-tube dust collector 4, a bag filter 5, an exhaust fan 6, a chimney 7, and a flue.

[0048] Economizer 2, air preheater 3, multi-tube dust collector 4, bag filter 5, flue gas exhaust fan 6, and chimney 7 are connected sequentially through a flue. The first end 8 of the long flue is close to the boiler, and the second end 9 is far from the boiler. Moreover, economizer 2 is first connected to the flue gas outlet of boiler body 1, and flue gas exhaust fan 6 is located between bag filter 5 and chimney 7. Flue gas exhaust fan 6 can draw flue gas to chimney 7, thereby discharging it into the external environment.

[0049] An embodiment of this utility model provides an external dry desulfurization system including a feeding device 100, a conveying pipeline 200, a desulfurization induced draft fan 300, and a leak-proof air supply device 400.

[0050] The feeding device 100 is loaded with a desulfurizing agent, which can react with sulfur dioxide to remove sulfur dioxide.

[0051] The first end of the conveying pipe 200 is connected to the feeding device 100, and the second end of the conveying pipe 200 is connected to the long flue.

[0052] The desulfurization induced draft fan 300 is installed on the conveying pipe 200 and provides power for conveying the desulfurizing agent from the feeding device 100 to the long flue. Under the action of the desulfurization induced draft fan 300, the desulfurizing agent placed at the feeding device 100 is drawn into the conveying pipe 200 and then conveyed to the long flue. The high-temperature flue gas in the long flue comes into full contact with the desulfurizing agent and reacts and reduces it, thereby removing the sulfur dioxide component in the flue gas.

[0053] The anti-leakage air supply device 400 is installed in the long flue to maintain a positive or slightly negative pressure state in the long flue, preventing outside air from entering the flue section, thereby preventing air leakage in the long flue and avoiding smoke leakage that pollutes the environment.

[0054] It is understood that the external dry desulfurization system provided in the embodiments of this utility model, by setting up a feeding device 100 loaded with desulfurizing agent, a conveying pipeline 200 and a desulfurization induced draft fan 300, uses the desulfurization induced draft fan 300 to transport the desulfurizing agent through the conveying pipeline 200 to the long flue of the boiler flue gas treatment line, so that the desulfurizing agent and the high temperature flue gas in the long flue can fully contact and react and reduce inside the long flue, thereby removing sulfur dioxide from the flue gas. The mixed flue gas after reacting with the desulfurizing agent is drawn to the chimney 7 by the exhaust induced draft fan 6 and discharged into the external environment, making the sulfur dioxide removal effect more obvious, the reaction more complete, and the desulfurization effect better, and less likely to cause corrosion, perforation and bursting of boiler components. Moreover, the original boiler flue gas treatment line is equipped with a leak-proof air supply device 400, which is set at the long flue to prevent flue gas leakage, resulting in low investment cost and low operating cost.

[0055] Specifically, in combination Figure 2 In some embodiments of this utility model, the feeding device 100 includes a feeding hopper 110 and a conveying device 120.

[0056] The feeding hopper 110 has an inlet 111 and an outlet 112. The outlet 112 is connected to the conveying device 120. The desulfurizing agent can be loaded into the feeding hopper 110 from the inlet 111 and then flow from the outlet 112 to the conveying device 120.

[0057] The conveying device 120 is connected to the first end of the conveying pipeline 200. The desulfurizing agent can be conveyed from the feeding tank 110 to the conveying pipeline 200, and finally it can be input into the long flue of the boiler flue gas treatment line to fully react with the flue gas in the long flue, thereby achieving desulfurization; the structure is simpler and the conveying efficiency of the desulfurizing agent is higher, thereby improving the desulfurization effect and efficiency.

[0058] In some embodiments of this utility model, the conveying device 120 can be a variable frequency screw conveyor. When the desulfurizing agent is conveyed from the discharge port 112 to the conveying device 120, the variable frequency screw conveyor can control the amount of desulfurizing agent in real time according to the load conditions through frequency conversion control, so as to save costs and improve efficiency.

[0059] Combination Figure 2 In some embodiments of this utility model, the conveying pipe 200 includes a first conveying pipe 210 and a second conveying pipe 220.

[0060] The first end of the first conveying pipe 210 is connected to the conveying device 120, and the second end of the second conveying pipe 220 is connected to the long flue.

[0061] The desulfurization induced draft fan 300 is connected in series with the second end of the first conveying pipe 210 and the first end of the second conveying pipe 220.

[0062] Under the action of the desulfurization induced draft fan 300, the desulfurizing agent in the feeding bucket 110 of the feeding device 100 can flow from the discharge port 112 to the conveying device 120, and then enter the first conveying pipe 210 and the second conveying pipe 220, and finally enter the long flue to react with the flue gas, thereby achieving desulfurization. The structure is simple, the effect is obvious and the cost is low.

[0063] Furthermore, in some embodiments of this utility model, the desulfurization induced draft fan 300 has an induced draft inlet 310 and an induced draft outlet 320.

[0064] The air inlet 310 is connected to the second end of the first conveying pipe 210, and the air outlet 320 is connected to the first end of the second conveying pipe 220.

[0065] The exhaust outlet 320 is set as a spiral nozzle; this increases the centrifugal force of the desulfurizing agent during the spraying process under the action of the desulfurization exhaust fan 300, while also making the desulfurizing agent more dispersed. This allows the desulfurizing agent to come into more full contact with the high-temperature flue gas in the long flue, reacting and reducing, thereby further improving the effect of removing sulfur dioxide from the flue gas.

[0066] Combination Figure 3 In some embodiments of this utility model, the leak-proof air supply device 400 includes a first air duct 410, a second air duct 420, and a leak-proof induced draft fan 430.

[0067] The first end of the first air duct 410 connects to the first end 8 of the long flue.

[0068] The second end of the second air duct 420 connects to the second end 9 of the long flue.

[0069] The leak-proof induced draft fan 430 is connected in series with the second end of the first air duct 410 and the first end of the second air duct 420.

[0070] The flue gas generated by the boiler body 1 can enter the first air duct 410 and the second air duct 420 from the first end of the first air duct 410, and then be discharged through the second end of the second air duct 420. This allows the long flue between the first end 8 and the second end 9 of the long flue to maintain a positive or slightly negative pressure state, preventing outside air from entering this section of the flue. It eliminates the need to find the air leakage point of the long flue and the need to replace the entire long flue, thus preventing air leakage in the long flue and preventing the leakage of flue gas containing sulfur dioxide. This allows the long flue to meet environmental protection requirements and reduces maintenance costs.

[0071] Combination Figure 1 In some embodiments of this utility model, the boiler flue gas treatment line includes an air preheater 3 and a multi-tube dust collector 4.

[0072] Among them, the long flue connects the air preheater 3 and the multi-tube dust collector 4.

[0073] The first end 8 of the long flue is close to the air preheater 3, and the second end 9 of the long flue is close to the multi-tube dust collector 4. That is to say, the first air duct 410 can be set at the outlet of the air preheater 3, and the second air duct 420 is set at the inlet of the multi-tube dust collector 4; this allows the long flue between the air preheater 3 and the multi-tube dust collector 4 to maintain a positive or slightly negative pressure, which can prevent outside air from entering the long flue between the air preheater 3 and the multi-tube dust collector 4. The structural design is flexible, simple and efficient, avoids air leakage, and thus effectively solves the problems of non-compliance with environmental emission standards and difficult boiler operation, ensuring that environmental emission standards are met.

[0074] Furthermore, in some embodiments of this utility model, the external dry desulfurization system also includes a control device and a flue gas detection device, with the flue gas detection device installed in a long flue.

[0075] The control device is electrically connected to the anti-leakage induced draft fan 430, the desulfurization induced draft fan 300, and the flue gas detection device.

[0076] The control device can control the operating status of the anti-leakage induced draft fan 430 and the desulfurization induced draft fan 300. Based on the flue gas concentration detected in the long flue by the flue gas detector, it controls the intensity of the anti-leakage induced draft fan 430 and the desulfurization induced draft fan 300, thereby saving operating costs and having a higher degree of intelligence.

[0077] Specifically, in some embodiments of this utility model, both the leak-proof induced draft fan 430 and the desulfurization induced draft fan 300 can be variable frequency induced draft fans.

[0078] The control device can be a PLC controller. The PLC controller is electrically connected to the variable frequency induced draft fan. The PLC controller can adjust the operating frequency of the relevant variable frequency fan according to the operating load of the boiler, thereby improving the operating efficiency of the variable frequency fan and saving costs.

[0079] It should be noted that in some embodiments of this utility model, the desulfurizing agent can be quicklime or sodium bicarbonate, which can greatly save costs and improve the desulfurization effect.

[0080] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0081] In the description of this specification, the use of terms such as "preferred embodiment," "another embodiment," "some embodiments," "other embodiments," or "specific example," etc., refers to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An external dry desulfurization system, installed in a boiler flue gas treatment line, wherein the boiler flue gas treatment line has a long flue, a first end of the long flue is close to the boiler, and a second end of the long flue is away from the boiler, characterized in that, The system includes: The feeding device is loaded with desulfurizing agent; A conveying pipe, the first end of which is connected to the feeding device, and the second end of which is connected to the long flue; A desulfurization induced draft fan, located in the conveying pipeline, provides power for conveying the desulfurizing agent from the feeding device to the long flue. An air leakage prevention device is installed in the long flue and is suitable for preventing air leakage in the long flue.

2. The external dry desulfurization system as described in claim 1, characterized in that, The feeding device includes a feeding hopper and a conveying device. The feeding hopper has an inlet and an outlet, and the outlet is connected to the conveying device. The conveying device is connected to the first end of the conveying pipeline.

3. The external dry desulfurization system as described in claim 2, characterized in that, The conveying device is a variable frequency screw conveyor.

4. The external dry desulfurization system as described in claim 2, characterized in that, The conveying pipeline includes a first conveying pipeline and a second conveying pipeline. The first end of the first conveying pipe is connected to the conveying device, and the second end of the second conveying pipe is connected to the long flue. The desulfurization induced draft fan is connected in series with the second end of the first conveying pipeline and the first end of the second conveying pipeline.

5. The external dry desulfurization system as described in claim 4, characterized in that, The desulfurization induced draft fan has an induced draft inlet and an induced draft outlet. The air inlet is connected to the second end of the first conveying pipe, and the air outlet is connected to the first end of the second conveying pipe. The exhaust outlet is a spiral nozzle.

6. The external dry desulfurization system as described in claim 1, characterized in that, The leak-proof air supply device includes a first air duct, a second air duct, and a leak-proof induced draft fan. The first end of the first air duct is connected to the first end of the long flue. The second end of the second air duct is connected to the second end of the long flue. The leak-proof induced draft fan is connected in series between the second end of the first air duct and the first end of the second air duct.

7. The external dry desulfurization system as described in claim 6, characterized in that, The boiler flue gas treatment line includes an air preheater and a multi-tube dust collector. The long flue connects the air preheater and the multi-tube dust collector. The first end of the long flue is close to the air preheater, and the second end of the long flue is close to the multi-tube dust collector.

8. The external dry desulfurization system as described in claim 7, characterized in that, It also includes a control device and a flue gas detection device, wherein the flue gas detection device is located in the long flue. The control device is electrically connected to the leak-proof induced draft fan, the desulfurization induced draft fan, and the flue gas detection device.

9. The external dry desulfurization system as described in claim 8, characterized in that, Both the anti-leakage induced draft fan and the desulfurization induced draft fan are variable frequency induced draft fans.

10. The external dry desulfurization system according to any one of claims 1 to 9, characterized in that, The desulfurizing agent is quicklime or baking soda.

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