Novel baking soda desulfurization spray gun heating device

Abstract

The utility model provides a novel baking soda desulfurization spray gun heating device which comprises a flue, a steam heating device and a baking soda conveying pipeline, the flue comprises an axial flow fan and a smoke suction pipe, the flue is a cylindrical pipeline, one end of the smoke suction pipe is connected with the upper portion of the flue, the other end of the smoke suction pipe is connected with the axial flow fan, and the steam heating device is connected with the baking soda conveying pipeline. The steam heating device is connected with the axial flow fan through a pipeline; the steam heating device comprises a thermal resistance sensor, a flow adjusting valve, a steam inlet, a steam outlet and a steam pipeline, the thermal resistance sensor is arranged at the upper end of the steam heating device, the steam inlet is formed in the middle of the upper end of the steam heating device, and the flow adjusting valve is arranged on the upper surface of the steam heating device. According to the utility model, NaHCO3 is rapidly heated, the NaHCO3 is decomposed into Na2CO3 capable of reacting with SO2 before entering the flue, no harsh requirement on the temperature of the original flue gas exists, and as only baking soda is heated, the power consumption is lower, and the normal operation of the SDS desulfurization system can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas heating, in particular to a novel baking soda desulfurization spray gun heating device. Background Art

[0002] In recent years, with the development of China's industrialization, the demand for aluminum has been gradually increasing. Currently, calcium-based wet desulfurization is the primary method used in my country's electrolytic aluminum industry. This is primarily due to the high flue gas volume, with SO2 concentrations ranging from 100mg to 400mg. Calcium-based wet desulfurization offers a stable system, high desulfurization efficiency, and sufficient flue gas treatment capacity. However, the entire system requires overhaul every one to two years. For cost reasons, each electrolytic cell is typically equipped with only one wet desulfurization system. Finding a stable desulfurization system during these overhauls is a challenge for the electrolytic aluminum industry. In recent years, the industry has seen a need for NaHCO3 dry desulfurization (SDS) to accommodate offline wet desulfurization overhauls. The SDS process is temperature-sensitive (maximum desulfurization efficiency is achieved only when flue gas temperatures exceed 120°C). However, after the electrolytic cell passes through the long flue gas duct, the temperature is typically around 100°C, sometimes as low as 70-80°C. Such a temperature is obviously not enough to meet the normal operation of the SDS desulfurization system, and the baking soda cannot be fully heated to the degree of decomposition. At the same time, the SDS process power consumption is relatively high. Summary of the Invention

[0003] The purpose of this utility model is to solve the shortcomings of the existing technology and propose a new type of baking soda desulfurization spray gun heating device;

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a novel baking soda desulfurization spray gun heating device, comprising a flue, a steam heating device, and a baking soda transport pipeline, the flue comprising an axial flow fan, a smoke extraction pipe A, and a smoke extraction pipe B, the flue being a cylindrical pipe, one end of the smoke extraction pipe A being connected to the upper part of the flue, the other end of the smoke extraction pipe A being connected to the axial flow fan, the steam heating device being connected to the axial flow fan through a pipe, one end of the smoke extraction pipe B being connected to the axial flow fan, the other end of the smoke extraction pipe B being connected to the smoke extraction pipe C; the steam heating device comprising a thermal resistor sensor, a steam inlet, a steam outlet, and a steam pipeline, the steam heating device being a square structure, having a total of six faces, respectively The front, back, top, bottom, left and right sides are respectively provided. The electric thermal resistor is provided on the top of the steam heating device, the steam inlet is provided on the middle part of the top of the steam heating device, the steam outlet is provided on the bottom part of the front of the steam heating device, the steam pipe is vertically provided inside the steam heating device, there are several steam pipes, the left side of the steam heating device is the smoke outlet, and the right side of the steam heating device is the smoke inlet; the baking soda transport pipeline includes a baking soda spray gun and a smoking pipe C. The baking soda spray gun is provided at the end of the baking soda transport pipeline, one end of the smoking pipe C is connected to the middle part of the baking soda transport pipeline, and the other end of the smoking pipe C is connected to the smoke outlet of the steam heating device.

[0005] Preferably, the thermal resistance sensor is located close to the steam inlet.

[0006] Preferably, the smoking pipe B is provided with a valve at one end close to the smoking pipe C.

[0007] Preferably, the valve is provided with a temperature sensor.

[0008] Preferably, the steam inlet is equipped with an electric flow regulating valve.

[0009] Preferably, the flue is provided with a temperature sensor.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention quickly heats NaHCO3 and decomposes it into Na2CO3 that can react with SO2 before NaHCO3 enters the flue. There are no stringent requirements on the temperature of the original flue gas. Since only baking soda is heated, the power consumption is low, which can ensure the normal operation of the SDS desulfurization system. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a novel baking soda desulfurization spray gun heating device of the present utility model;

[0012] Figure 2This is a schematic structural diagram of the steam heating device of the novel baking soda desulfurization spray gun heating device of the present utility model;

[0013] Explanation of the reference numbers: 1-flue; 101-baking soda spray gun; 102-baking soda delivery pipeline; 2-steam heating device; 201-steam outlet; 202-steam pipeline; 203-flue gas inlet; 204-steam inlet; 205-thermal resistor sensor; 206-flue gas outlet; 3-axial flow fan; 301-exhaust pipe A; 302-exhaust pipe B; 303-valve; 304-exhaust pipe C. DETAILED DESCRIPTION

[0014] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0015] like Figure 1 As shown, a new baking soda desulfurization spray gun heating device according to one embodiment of the present invention includes a flue 1, a steam heating device 2, and a baking soda transport pipeline 102.

[0016] The flue includes an axial flow fan 3, a smoke extraction pipe A301, and a smoke extraction pipe B302. The flue 1 is a cylindrical pipe. One end of the smoke extraction pipe A301 is connected to the upper part of the flue 1, and the other end of the smoke extraction pipe A301 is connected to the axial flow fan 3. The steam heating device 2 is connected to the axial flow fan 3 through a pipe. One end of the smoke extraction pipe B302 is connected to the axial flow fan 3, and the other end of the smoke extraction pipe B302 is connected to the smoke extraction pipe C304.

[0017] like Figure 2 As shown, the steam heating device includes a thermal resistor sensor 205, a steam inlet 204, a steam outlet 201 and a steam pipe 202. The steam heating device 2 is a square structure with six sides, namely the front, back, top, bottom, left and right. The thermal resistor 205 is arranged at the upper end of the steam heating device 2, the steam inlet 204 is arranged in the middle of the top of the steam heating device 2, the steam outlet 201 is arranged at the bottom position of the front of the steam heating device 2, the steam pipe 202 is vertically arranged inside the steam heating device 2, there are several steam pipes 202, the left side of the steam heating device 2 is the flue gas outlet 206, and the right side of the steam heating device 2 is the flue gas inlet 203.

[0018] The baking soda transport pipeline 102 includes a baking soda spray gun 101 and a smoke pipe C304. The baking soda spray gun 101 is arranged at the end of the baking soda transport pipeline 102. One end of the smoke pipe C304 is connected to the middle part of the baking soda transport pipeline 102, and the other end of the smoke pipe C304 is connected to the smoke outlet 206 of the steam heating device 2.

[0019] Preferably, the thermal resistor sensor 205 is located near the steam inlet 204. Such a design can detect the temperature of the steam. When the steam temperature is too low, the thermal resistor sensor 205 will sound an alarm to remind the operator to replace the steam.

[0020] Preferably, a valve 303 is provided at one end of the smoke extraction pipe B302 near the smoke extraction pipe C304. This design allows the suction force of the axial flow fan 3 to absorb the flue gas with too low a temperature back into the axial flow fan 3, and then send the flue gas into the steam heating device 2 for secondary heating, so that the flue gas reaches the desired temperature.

[0021] Preferably, the valve 303 is equipped with a temperature sensor and a controller. The temperature sensor can detect the temperature of the flue gas and transmit the temperature data to the controller. The controller is configured to receive the temperature data and compare the received temperature data with a set threshold value, which is 120°. If the flue gas temperature is lower than 120°, the controller will issue a command to the valve 303, causing the valve 303 to open. Under the suction force of the axial flow fan 3, the flue gas below 120° enters the exhaust pipe B302. If the flue gas temperature is higher than or equal to 120°, the controller will issue a command to the valve 303, causing the valve 303 to close.

[0022] Preferably, the steam inlet 204 is equipped with an electric flow regulating valve. With this design, the operator can adjust the steam consumption according to the actual situation to maximize energy utilization.

[0023] Preferably, a temperature sensor is provided in the flue 1. This design can adjust the steam usage of the steam heating device 2 according to different flue gas temperatures by linking the temperature sensor data with the original DCS system.

[0024] When in use, take out the new baking soda desulfurization spray gun heating device in its original state, first inject a certain amount of steam into the steam heating device 2, and the steam flows through the steam pipe 202 for preheating; then turn on the axial flow fan 3 to generate attraction for the smoke extraction pipe A301, and extract the smoke from the front flue 1 through the smoke extraction pipe A301, and then bring the smoke into the steam heating device 2 through the axial flow fan 3, and perform heat exchange through the steam pipe 202. Further, through the heating of the steam heating device 2, the smoke temperature is raised to above 120 degrees, and the heated smoke is transported to the smoke extraction pipe C304, and then through the pipe 102.

[0025] If the flue gas temperature is below 120°C, valve 303 is opened, allowing the flue gas to flow out under the action of axial flow fan 3. The flue gas passes through the exhaust pipe B302 and, after passing through the axial flow fan 3, is transported to the steam heating device 2 for secondary heating. The flue gas with a temperature exceeding 120°C is transported to the baking soda transport pipe 102, where it is heated with baking soda, decomposing the baking soda into Na2CO3. Finally, the Na2CO3 is released into the flue 1 through the baking soda spray gun 101.

[0026] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A novel baking soda desulfurization spray gun heating device, comprising a flue (1), a steam heating device (2), and a baking soda transport pipeline (102), characterized in that: The flue (1) includes an axial flow fan (3), a smoke extraction pipe A (301), and a smoke extraction pipe B (302). The flue (1) is a cylindrical pipe. One end of the smoke extraction pipe A (301) is connected to the upper part of the flue (1), and the other end of the smoke extraction pipe A (301) is connected to the axial flow fan (3). The steam heating device (2) is connected to the axial flow fan (3) through a pipe. One end of the smoke extraction pipe B (302) is connected to the axial flow fan (3), and the other end of the smoke extraction pipe B (302) is connected to the smoke extraction pipe. The steam heating device (2) includes a thermal resistor sensor (205), a steam inlet (204), a steam outlet (201) and a steam pipe (202). The steam heating device (2) is a square structure with six faces, namely, the front, the back, the top, the bottom, the left and the right. The thermal resistor sensor (205) is arranged on the steam heating device. The steam heating device (2) is placed on the top, the steam inlet (204) is arranged in the middle of the top of the steam heating device (2), the steam outlet (201) is arranged at the bottom position in front of the steam heating device (2), the steam pipe (202) is vertically arranged inside the steam heating device (2), there are multiple steam pipes (202), the left side of the steam heating device (2) is a smoke outlet (206), and the right side of the steam heating device (2) is a smoke inlet (203); the baking soda transport pipe (102) includes a baking soda spray gun (101) and a smoke pipe C (304), the baking soda spray gun (101) is arranged at the end of the baking soda transport pipe (102), one end of the smoke pipe C (304) is connected to the middle of the baking soda transport pipe (102), and the other end of the smoke pipe C (304) is connected to the smoke outlet (206) of the steam heating device (2).

2. A novel baking soda desulfurization spray gun heating device as claimed in claim 1, characterized in that: The thermal resistor sensor (205) is located close to the steam inlet (204).

3. A novel baking soda desulfurization spray gun heating device as claimed in claim 1, characterized in that: The smoking pipe B (302) is provided with a valve (303) at one end close to the smoking pipe C (304).

4. A novel baking soda desulfurization spray gun heating device as claimed in claim 3, characterized in that: The valve (303) is provided with a temperature sensor.

5. A novel baking soda desulfurization spray gun heating device as claimed in claim 1, characterized in that: The steam inlet (204) is additionally equipped with an electric flow regulating valve.

6. A novel baking soda desulfurization spray gun heating device as claimed in claim 1, characterized in that: The flue (1) is provided with a temperature sensor.

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