Flue gas purification device for gas trolley type heating furnace

Abstract

The utility model relates to a flue gas purification device for a gas trolley type heating furnace. The flue gas purification device is provided with a water tank and a purification pipe, the water tank is provided with an air inlet and an air outlet; an air inlet of the water tank is connected with a smoke exhaust pipe of the gas trolley type heating furnace; a vertically arranged purification pipe is arranged at an air outlet of the water tank; purified water is arranged in the water tank; a plurality of groups of spraying devices are arranged on the purification pipe along the height direction of the pipeline; and the spraying device is connected with the water pipe and generates high-pressure water mist to fill the purification pipe. According to the flue gas purification device for the gas trolley type heating furnace, nitric oxide and sulfur dioxide in flue gas are treated through sufficient water mist, the content of noxious substances such as the nitric oxide in the final flue gas is sufficiently reduced, particularly, the content of NOx in the flue gas is lower than 50 mg / m, and the ultra-low emission requirement is met.

Description

Flue gas purification device for gas-fired bogie-type heating furnace Technical Field

[0001] This utility model relates to a flue gas purification device for a gas-fired trolley-type heating furnace, belonging to the field of industrial heating furnace technology. Background Technology

[0002] Combustion-type furnaces are still the main type of furnace used in industrial heating, especially in fields such as steel forging and heat treatment. This is because combustion-type furnaces have a fast temperature rise and adjustment response, high energy density, and temperatures that can reach over 1000℃. Furthermore, combustion-type furnaces that use natural gas or other fuels produce clean air emissions, mainly consisting of CO2 (carbon dioxide, a product of the reaction between fuel and oxygen), NOx (nitrogen oxides, a product of nitrogen in the air at high temperatures), and H2O (water).

[0003] To meet environmental emission requirements, the flue gas produced after combustion generally needs to be further treated; the main purpose is to treat nitrogen oxides, i.e., denitrification; conventional denitrification methods are to use adsorption materials to adsorb nitrogen oxides, or to use catalytic materials to reduce nitrogen oxides; both of these methods are relatively material-intensive.

[0004] Therefore, it is necessary to design a flue gas purification and treatment device to efficiently treat the flue gas generated after combustion using low-cost methods, in order to control the NOx content in the flue gas to below the ultra-low emission standard of 50mg / m³. Summary of the Invention

[0005] The purpose of this utility model is to provide a flue gas purification device for a gas-fired trolley-type heating furnace. The device features an improved structural design and utilizes water and water mist to efficiently treat the flue gas generated after combustion, enabling the flue gas to meet environmental emission standards.

[0006] To achieve the above-mentioned utility model objectives, this utility model provides a flue gas purification device for a gas-fired trolley-type heating furnace, which includes a water tank and a purification pipe;

[0007] The water tank has an air inlet and an air outlet;

[0008] The air inlet of the water tank is connected to the flue pipe of the gas-fired bogie-type heater; the air outlet of the water tank is equipped with a vertically installed purification pipe.

[0009] The water tank contains purified water;

[0010] Several sets of spray devices are installed along the height of the purification pipe; the spray devices are connected to the water pipe, and the spray devices generate high-pressure water mist that fills the purification pipe.

[0011] As a further improvement of this utility model, the water surface of the purified water is spaced apart from the bottom of the air inlet of the water tank, or submerges the bottom of the air inlet of the water tank.

[0012] As a further improvement of this utility model, the end of the flue pipe enters vertically downward into the top of the water tank, and the end of the flue pipe is inserted into the inner side of the top plate of the water tank by a certain distance.

[0013] The end of the purification pipe is inserted a certain distance into the inside of the top plate of the water tank;

[0014] As a further improvement of this utility model, a water supply pipe is provided on one side of the water tank;

[0015] There are two water supply pipes, one of which is an automatic water supply pipe that is connected to the tap water pipe through a solenoid valve and a regulating valve.

[0016] The other is a manual water supply pipe, which is connected to the tap water pipe via a manual valve.

[0017] As a further improvement of this utility model, a level gauge is installed on the side of the water tank.

[0018] As a further improvement of this utility model, an overflow port is provided on the upper side of the water tank; the overflow port is connected to the sewage pipe.

[0019] Furthermore, a drain outlet is provided on the lower side or bottom of the water tank, and a drain valve is installed at the drain outlet;

[0020] The sewage outlet is connected to the sewage pipe.

[0021] As a further improvement of this utility model, a water suction pipe is provided on the wall of the water tank. The water suction pipe is connected to a high-pressure water pump. The outlet pipe of the high-pressure water pump is connected to a spray device. The spray device generates high-pressure water mist, which fills the purification pipe.

[0022] As a further improvement of this utility model, the spraying device includes multiple central nozzles and multiple surrounding spray pipes;

[0023] Multiple central nozzles extend into the middle of the purification pipe, spraying water mist downwards and scattering it in all directions;

[0024] Multiple circumferential nozzles are arranged around the cross-section of the purification pipe, and each circumferential nozzle has several nozzles that spray water mist upward and inward.

[0025] Furthermore, the nozzles arranged around the nozzle are arranged in two rows along the height direction, producing two different spray angles relative to the horizontal plane.

[0026] This utility model discloses a flue gas purification device for a gas-fired trolley-type heating furnace. By using sufficient water mist, it treats nitrogen oxides and sulfur dioxide in the flue gas, effectively reducing the content of harmful substances such as nitrogen oxides in the final flue gas. In particular, the NOx content in the flue gas is lower than 50 mg / m³, meeting the requirements for ultra-low emissions. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the overall structure of the gas-fired bogie-type heater of this utility model (taking the bogie furnace as an example);

[0028] Figure 2 is a schematic diagram of the connection structure between the exhaust pipe and the flue gas purification device of this utility model;

[0029] Figure 3 is a schematic diagram of the water tank in the flue gas purification device of this utility model;

[0030] Figure 4 is a schematic diagram of the spray pipe in the flue gas purification device of this utility model;

[0031] Figure 5 is a partially enlarged schematic diagram of Figure 4. Detailed Implementation

[0032] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0033] This utility model relates to a gas-fired bogie-type heating furnace, taking the bogie furnace as an example.

[0034] The overall structure of the gas-fired trolley-type heating furnace of this utility model is shown in Figure 1. It is provided with a trolley 1, and a trolley drive 12 is provided below the trolley 1 to drive the trolley 1 to enter and exit the heating furnace 2. The heating furnace 2 is provided with a furnace body 21 that is basically rectangular. An opening is provided on one side of the furnace body 21 to facilitate the entry and exit of the trolley 1. A furnace door 22 is provided at the opening.

[0035] For the rectangular furnace body 21 and the bogie furnace structure, several burners 3 are generally provided on both sides of the furnace body 21. The burners 3 are preferably low-NOx regenerative burners, which generally have a heat storage body made of honeycomb ceramic for heat exchange. The burners 3 are preferably evenly distributed and arranged in pairs facing each other. The burners 3 are connected to the air inlet pipe 7 and the flue pipe 8 through reversing valves.

[0036] Several environmentally friendly small burners 4 are also distributed on the wall of the furnace body 21. The environmentally friendly small burners 4 need to be set at a sufficient distance from the burners 3. In practice, the interval distance needs to be greater than 1.5 meters. The environmentally friendly small burners 4 are used to participate in the combustion and heating inside the furnace body 21 to reduce the nitrogen oxides generated during the combustion and heating process of the burners 3 in the furnace.

[0037] The flue gas generated inside the furnace body 21 is discharged from the furnace body 21 through the burner 3 in the flue gas exhaust state and through the flue gas exhaust pipe 8. The end of the flue gas exhaust pipe 8 is equipped with a flue gas exhaust fan 81. When the flue gas exhaust fan 81 is working, it draws out the flue gas inside the furnace body 21 and connects it to the flue gas purification device 9 through the flue gas exhaust pipe 88, as shown in Figure 2.

[0038] Further, as shown in Figures 3 and 4, the flue gas purification device 9 includes a water tank 91. The end of the flue gas outlet pipe 88 vertically downwards enters the top of the water tank 91, and preferably, the end 881 of the flue gas outlet pipe 88 is inserted into the inner side of the top plate of the water tank 91 by a certain distance. The water tank 91 contains purified water 910. The flue gas discharged by the exhaust fan 85 is cooled, and the water vapor in it condenses and enters the water tank 91 through the flue gas outlet pipe 88, where it is absorbed into the purified water 910. Because the end 881 of the flue gas outlet pipe 88 is inserted into the water tank 91, even if the condensed water condenses into water droplets inside the flue gas outlet pipe 88, it will still be absorbed into the purified water 910 through the end. 881 falls into the purified water 910 without flowing over the top of the flue gas tank 91. Of course, the top of the tank 91 can be made into a cone with a downward convex shape in the middle, so that the condensate generated at the top of the tank 91 will eventually gather along the cone and drip into the purified water 910, preventing water from flowing out from the gaps around the top cover of the tank 91 and polluting the environment. Solid particles in the flue gas will also rush towards the purified water 910 along with the downward-moving flue gas and enter the purified water 910. The remaining air will blow over the surface of the purified water 910 and then continue to flow outward through the purification pipe 92 on the other side of the tank 91.

[0039] Preferably, the end of the flue pipe 88 is completely submerged in the purified water 910. However, this will increase the pressure on the flue side, requiring an increase in the air pressure of the exhaust fan 85 so that the flue gas in the furnace body 21 can be fully discharged and discharged into the purified water 910.

[0040] A water supply pipe 911 is provided on one side of the water tank 91; preferably, there are two water supply pipes 911, one is an automatic water supply pipe, which is connected to the tap water pipe 915 through a solenoid valve 912 and a regulating valve 913, and the other is a manual water supply pipe, which is connected to the tap water pipe 915 through a manual valve 914; when it is necessary to add purified water 910 to the water tank 91 at the beginning of operation, the manual valve 914 can be opened manually to add water. In later operation, the purified water 910 can be automatically added to the water tank 91 through the solenoid valve 912.

[0041] A level gauge 916 is installed on the side of the water tank 91 to facilitate the confirmation of the liquid level in the water tank 91.

[0042] An overflow port 917 is provided on the upper side of the water tank 91. The height of the overflow port 917 determines the liquid level of the purified water 910 during daily operation. Furthermore, a drain port 918 is provided on the lower side or bottom of the water tank 91. A drain valve 919 is installed at the drain port 918 and is connected to the drain pipe of the overflow port 917. The sludge that has settled at the bottom of the water tank 91 can be periodically discharged through the drain port 918.

[0043] The purification pipe 92 is installed vertically, and several sets of spray devices 94 are provided along the height of the pipe. The water used by the spray devices 94 comes from the water tank 91. A water pumping pipe 931 is provided on the wall of the water tank 91. The water pumping pipe 931 is connected to the high-pressure water pump 93. The outlet pipe 932 of the high-pressure water pump 93 is connected to the spray device 94, so that the spray device 94 generates high-pressure water mist, which fills the purification pipe 92.

[0044] Further, as shown in Figure 5, the spraying device 94 includes multiple central nozzles 942 located in the middle of the purification pipe 92, spraying water mist downwards and scattering outwards; the spraying device 94 also includes multiple surrounding spray pipes 943, which surround the cross-section of the purification pipe 92 in a circular pattern. Each surrounding spray pipe 943 has several nozzles 944. Preferably, the nozzles 944 are arranged in two rows along the height direction, generating two different spray angles V1 (approximately 20°) and V2 (approximately 45°) relative to the horizontal plane, spraying water mist upwards and inwards; each group of spray pipes 943... The spray device 94 is connected to the outlet pipe 932 through the spray branch pipe 941; several sets of spray devices 94 are provided along the height direction of the purification pipe 92, which work simultaneously to generate water mist that alternates between the upper and lower parts and the inside and outside parts. The water and flue gas are fully combined. On the one hand, the dust mixed in the flue gas can be wetted, making it heavier and falling into the purified water 910 along the purification pipe 92. On the other hand, the soluble gases in the flue gas can be adsorbed and dissolved, falling into the purified water 910 along the purification pipe 92. In particular, it reacts with nitrogen oxides and sulfur dioxide in the flue gas.

[0045] 1. NO does not react directly with water at room temperature, but it will rapidly react with oxygen to produce NO2, and finally react to produce weak nitric acid:

[0046] 4NO + 3O₂ + 2H₂O = 4HNO₃ is a reversible reaction;

[0047] 2. NO2 reacts directly with water at room temperature to produce weak nitric acid:

[0048] 3NO2 + H2O = 2HNO3 + NO, which is a reversible reaction;

[0049] The weak nitric acid generated by the reaction of nitrogen oxides (NOx, NO, NO2) with water is quickly dissolved into the water mist and falls into the purified water 910 along the purification pipe 92. In the water, the weak nitric acid can exist stably and will no longer be reduced to nitrogen oxides.

[0050] 3. SO2 reacts directly with water at room temperature to produce weak sulfurous acid.

[0051] SO2 + H2O = H2SO3, which is a reversible reaction;

[0052] The weak sulfurous acid produced by the reaction of sulfur dioxide (SO2) with water quickly dissolves into the water mist and falls into the purified water 910 along the purification pipe 92. In the water, the weak sulfurous acid can exist stably and will not be reduced to sulfur dioxide.

[0053] The upper layer of purified water 910 in water tank 91 is rapidly discharged through overflow port 917 for further treatment, thus preventing the reverse decomposition of nitric acid and sulfurous acid; that is, through spraying water mist, efficient purification of nitrogen oxides and sulfur dioxide in flue gas is achieved. The top of purification pipe 92 discharges purified flue gas that meets emission standards. A flue gas emission test port 95 can be installed at the top of purification pipe 92, and flue gas detection equipment can be installed to detect and monitor the purified flue gas.

[0054] This utility model discloses a flue gas purification device for a gas-fired trolley-type heating furnace. By using sufficient water mist, it treats nitrogen oxides and sulfur dioxide in the flue gas, effectively reducing the content of harmful substances such as nitrogen oxides in the final flue gas. In particular, the NOx content in the flue gas is lower than 50 mg / m³, meeting the requirements for ultra-low emissions.

[0055] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A flue gas purification device for a gas-fired bogie-type heating furnace, characterized in that, It is equipped with a water tank and a purification pipe; the water tank has an air inlet and an air outlet; the air inlet of the water tank is connected to the flue pipe of the gas-fired trolley-type heating furnace; the air outlet of the water tank is equipped with a vertically installed purification pipe; the water tank contains purified water; the purification pipe is equipped with several sets of spray devices along the height of the pipe; the spray devices are connected to the water pipe, and the spray devices generate high-pressure water mist to fill the purification pipe.

2. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1, characterized in that, The water level of the purified water is spaced apart from the bottom of the air inlet of the water tank, or it covers the bottom of the air inlet of the water tank.

3. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1, characterized in that, The end of the flue pipe extends vertically downwards into the top of the water tank, and the end of the flue pipe is inserted a certain distance into the inside of the top plate of the water tank; the end of the purification pipe is inserted a certain distance into the inside of the top plate of the water tank.

4. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1, characterized in that, A water supply pipe is provided on one side of the water tank; there are two water supply pipes, one is an automatic water supply pipe, which is connected to the tap water pipe through a solenoid valve and a regulating valve; the other is a manual water supply pipe, which is connected to the tap water pipe through a manual valve.

5. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1, characterized in that, A level gauge is installed on the side of the water tank.

6. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1, characterized in that, An overflow port is located on the upper side of the water tank; the overflow port is connected to the drain pipe.

7. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1 or 6, characterized in that, The water tank has a drain outlet on the lower side or bottom, and a drain valve is installed at the drain outlet; the drain outlet is connected to a drain pipe.

8. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1, characterized in that, A water pump is installed on the wall of the water tank. The water pump is connected to a high-pressure water pump. The outlet pipe of the high-pressure water pump is connected to a spray device. The spray device generates high-pressure water mist, which fills the purification pipe.

9. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 1, characterized in that, The spraying device includes a central nozzle and surrounding spray pipes; multiple central nozzles extend into the middle of the purification pipe and spray water mist downwards and scatters in all directions; multiple surrounding spray pipes are arranged around the cross-section of the purification pipe, and each surrounding spray pipe has several nozzles that spray water mist upwards and inwards.

10. The flue gas purification device for a gas-fired bogie-type heating furnace as described in claim 9, characterized in that, The nozzles surrounding the nozzle are arranged in two rows along the height direction, producing two different spray angles relative to the horizontal plane.

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