SCR (Selective Catalytic Reduction) flue gas denitration purification treatment equipment

Abstract

The utility model discloses SCR (Selective Catalytic Reduction) flue gas denitration purification treatment equipment and relates to the technical field of flue gas treatment. The device comprises a water storage tank, a purification cylinder, a purification tower, a fan and an ammonia water tank, the purification cylinder is fixed at the upper end of the water storage tank, the water storage tank and the ammonia water tank are arranged side by side, the purification tower is fixed at the upper end of the ammonia water tank in a penetrating manner, and the fan is arranged between the purification cylinder and the purification tower; an inner container is fixed in the purification cylinder, multiple layers of baffling assemblies distributed at equal intervals, a first flow guide plate, an electric heating pipe and a tray are arranged in an inner cavity of the inner container from bottom to top, and an oxygen pipe is fixed to the portion, between the electric heating pipe and the first flow guide plate, of the side wall of the inner container in a penetrating mode. Through the arrangement of the purification cylinder, the oxygen pipe, the water storage tank, the electric heating pipe, the baffling assembly, the guide plate I, the tray, the purification tower and the spraying coil pipe, the problems that in the flue gas denitration process, the oxygen content is insufficient, particulate matters are difficult to remove on the premise of ensuring the temperature, the reaction time is insufficient, the flue gas distribution is not uniform, and secondary purification treatment operation is lacked are solved.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas treatment technology, and in particular relates to an SCR flue gas denitrification and purification treatment device. Background Technology

[0002] Flue gas denitrification mainly refers to the removal of nitrogen oxides (NOx) from flue gas. These nitrogen oxides, when released into the atmosphere, form acid rain, posing a significant threat to human health. Flue gas from fuels such as coal, gas, and biomass typically contains these pollutants. Power plants, steel mills, foundries, kilns, and boilers, in particular, require flue gas denitrification equipment during operation or construction to ensure their flue gas meets local emission standards. Flue gas denitrification methods include: Selective Non-Catalytic Reduction (SNCR): A reducing agent (such as ammonia or urea) is added to the flue gas at high temperatures (1000°C - 1200°C) to reduce NOx to N2. Selective Catalytic Reduction (SCR): At lower temperatures (150°C - 450°C), a catalyst promotes the reaction between the reducing agent (such as ammonia) and NOx, reducing NOx to nitrogen. This technology requires a catalyst and has relatively low reaction temperature requirements. However, it still has the following drawbacks in practical use:

[0003] First, selective catalytic reduction (SCR) technology requires sufficient oxygen to achieve reduction and denitrification. However, conventional denitrification equipment directly introduces flue gas into the equipment, which leads to insufficient oxygen content inside the equipment during long-term operation, resulting in a significant reduction in reduction efficiency. Therefore, it is necessary to replenish sufficient oxygen in a timely manner.

[0004] Secondly, although selective catalytic reduction (SCR) technology does not require very high temperatures, it still requires certain temperature conditions. Therefore, how to ensure that the temperature is sufficient during the flue gas denitrification process is a key issue. Furthermore, flue gas usually contains dust, and if denitrification is performed directly, it is easy to quickly cover the catalyst and reduce the reaction rate. However, spraying dust suppression will reduce the flue gas temperature. Therefore, it is necessary to carry out certain pre-dust removal operations while maintaining the temperature.

[0005] Secondly, the flue gas needs to be introduced into the denitrification equipment using an induced draft device, which results in a slightly faster flue gas flow rate. This can easily lead to insufficient contact with the catalyst before the gas flows away, resulting in incomplete purification. Therefore, it is necessary to make the flue gas distribution more uniform and increase the reaction time.

[0006] Finally, the flue gas reacts with catalysts and ammonia, etc., and a single reaction may not be enough to completely purify it, so a secondary purification process may be added as appropriate. Utility Model Content

[0007] The purpose of this utility model is to provide an SCR flue gas denitrification and purification equipment. By setting up a purification cylinder, oxygen pipe, water storage tank, electric heating tube, baffle assembly, guide plate, tray, purification tower, and spray coil, it solves the problems that may exist in the flue gas denitrification process, such as insufficient oxygen content, difficulty in removing particulate matter while ensuring temperature, insufficient reaction time, uneven flue gas distribution, and lack of secondary purification treatment.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0009] This utility model is an SCR flue gas denitrification and purification treatment equipment, including a water storage tank, a purification cylinder, a purification tower, a fan and an ammonia tank. The purification cylinder is fixed at the upper end of the water storage tank. The water storage tank and the ammonia tank are arranged side by side, and the purification tower is fixed through the upper end of the ammonia tank. A fan is arranged between the purification cylinder and the purification tower.

[0010] The purification cylinder is fixed with an inner liner, and the space between the outer wall of the inner liner and the inner wall of the purification cylinder is filled with heat insulation cotton. The inner cavity of the inner liner is provided with multiple layers of equally spaced baffle components, and a guide plate is fixed on the inner wall of the inner liner above the baffle components. An electric heating tube is fixed in the inner liner above the guide plate, and a tray is fixed in the inner liner above the electric heating tube. An oxygen tube is fixed through the inner liner side wall between the electric heating tube and the guide plate.

[0011] A second guide plate is fixed on the inner wall of the purification tower, and a spray coil is fixed on the inner wall of the purification tower above the second guide plate. An atomizing nozzle is fixed through the bottom of the spray coil.

[0012] Furthermore, the water storage tank contains hot water, and a flue gas inlet is fixedly connected to the water storage tank on one side of the purification cylinder, with the bottom end of the flue gas inlet extending into the hot water in the water storage tank. The upper and lower ends of the inner tank are connected to the purification cylinder, and the bottom end of the inner tank is connected to the water storage tank.

[0013] Furthermore, each layer of the baffle assembly includes equidistantly distributed shafts, and each shaft is fixed with two baffle plates that are centrally symmetrically distributed. The baffle plates are inclined, and the baffle plates in adjacent layers of the baffle assembly are inclined in opposite directions.

[0014] Furthermore, both the first and second guide plates are inclined, and both the first and second guide plates have waist-shaped holes.

[0015] Furthermore, the end of the oxygen tube away from the inner liner passes through the insulation cotton and the purification cylinder and extends out, the power receiving end of the electric heating tube passes through the insulation cotton and the purification cylinder and extends out, a cross grid is fixed inside the tray, and the tray outside the cross grid is filled with catalyst, and the bottom of the tray has through holes distributed in a rectangular array.

[0016] Furthermore, an air outlet hopper is fixedly connected to the upper end of the inner liner, a smoke extraction pipe is fixed to the air intake end of the fan, and the end of the smoke extraction pipe away from the fan is connected to the upper end of the air outlet hopper. An exhaust pipe is fixed to the air outlet end of the fan, and the end of the exhaust pipe away from the fan extends into the purification tower, and the exhaust pipe is located below the guide plate.

[0017] Furthermore, a water pump is fixed on the side wall of the purification tower away from the fan, and the pump's pumping end is connected to the ammonia tank. A water outlet pipe is fixed on the pump's outlet end, and the end of the water outlet pipe away from the pump is connected to the spray coil. An air outlet hopper 2 is fixed through the upper end of the purification tower, and the upper end of the air outlet hopper 2 is open.

[0018] This utility model has the following beneficial effects:

[0019] This invention solves the problem of insufficient oxygen content in the flue gas denitrification process by setting up a purification cylinder and an oxygen pipe; selective catalytic reduction denitrification is carried out in the purification cylinder, and oxygen-containing air is supplied to the inner liner through the oxygen pipe to avoid insufficient oxygen in the denitrification reaction process, thereby ensuring a highly efficient reduction denitrification reaction.

[0020] This invention solves the problem of removing particulate matter in flue gas denitrification while maintaining the required temperature by incorporating a water storage tank and an electric heating element. The water storage tank is filled with hot water, and flue gas is directly introduced into the hot water, generating bubbles. After the bubbles burst, the flue gas enters the inner tank for denitrification treatment. The hot water design prevents the flue gas temperature from dropping, and the secondary heating by the electric heating element raises the flue gas temperature to over 150°C, thus ensuring sufficient reaction temperature while removing particulate matter from the flue gas.

[0021] This invention solves the problems of insufficient reaction time and uneven flue gas distribution by incorporating a baffle assembly, a guide plate, and a tray. The baffle assembly continuously redirects and guides the flue gas, increasing its travel distance and thus reaction time. The guide plate then evenly distributes the rising flue gas, which enters through uniformly spaced holes at the bottom of the tray to react with the catalyst within. This achieves a uniform reaction and ensures sufficient reaction time.

[0022] This invention solves the problem of lacking secondary purification treatment by setting up a purification tower and spray coils. After the reaction is completed in the purification cylinder, the flue gas enters the purification tower, where ammonia water is atomized and sprayed out from the spray coils to carry out secondary reaction purification treatment on the flue gas entering the purification tower, making the denitrification of the flue gas more thorough. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0024] Figure 1 A three-dimensional view of an SCR flue gas denitrification and purification treatment device;

[0025] Figure 2 This is a cross-sectional view of an SCR flue gas denitrification and purification device;

[0026] Figure 3 This is a cross-sectional view of the purification cylinder;

[0027] Figure 4 This is a cross-sectional view of the purification tower;

[0028] Figure 5 This is a structural diagram of the fan;

[0029] Figure 6 This is a bottom view of the tray;

[0030] Figure 7 This is a structural diagram of the baffle assembly;

[0031] Figure 8 This is a structural diagram of an electric heating element.

[0032] Figure label:

[0033] 1. Water storage tank; 101. Flue gas inlet; 2. Purification cylinder; 201. Gas outlet hopper one; 202. Electric heating element; 203. Insulation cotton; 204. Inner liner; 205. Tray; 2051. Cross grid; 2052. Catalyst; 2053. Through hole; 206. Baffle plate one; 207. Baffle assembly; 2071. Shaft; 2072. Baffle plate; 3. Purification tower; 301. Gas outlet hopper two; 302. Spray coil; 3021. Atomizing nozzle; 303. Baffle plate two; 4. Fan; 401. Smoke extraction pipe; 402. Exhaust pipe; 5. Ammonia water tank; 6. Water pump; 601. Water outlet pipe; 7. Oxygen pipe. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0035] Please see Figure 1-8 As shown, this utility model is an SCR flue gas denitrification and purification treatment equipment, including a water storage tank 1, a purification cylinder 2, a purification tower 3, a fan 4 and an ammonia tank 5. The purification cylinder 2 is fixed at the upper end of the water storage tank 1. The water storage tank 1 and the ammonia tank 5 are arranged side by side, and the purification tower 3 is fixed through the upper end of the ammonia tank 5. The fan 4 is arranged between the purification cylinder 2 and the purification tower 3.

[0036] The water storage tank 1 stores hot water and is equipped with a heating device to maintain a constant temperature (a conventional structure, not shown in the figure). The inlet and outlet water pipes 601 of the water storage tank 1 and the ammonia tank 5 are shown in the figure. The purification cylinder 2 is used for selective catalytic reduction denitrification treatment, and the purification tower 3 is used for secondary denitrification treatment. The flue gas in the purification cylinder 2 is introduced into the purification tower 3 by the fan 4.

[0037] The purification cylinder 2 is fixed with an inner liner 204, and the space between the outer wall of the inner liner 204 and the inner wall of the purification cylinder 2 is filled with heat insulation cotton 203. The inner cavity of the inner liner 204 is provided with multiple layers of equally spaced baffle components 207, and a guide plate 206 is fixed on the inner wall of the inner liner 204 above the baffle components 207. An electric heating tube 202 is fixed in the inner liner 204 above the guide plate 206. A tray 205 is fixed in the inner liner 204 above the electric heating tube 202, and an oxygen tube 7 is fixed through the side wall of the inner liner 204 between the electric heating tube 202 and the guide plate 206.

[0038] The inner liner 204 inside the purification cylinder 2 is a selective catalytic reduction denitrification treatment space, and is insulated with heat insulation cotton 203. The flue gas enters from the bottom of the inner liner 204, and passes through the baffle assembly 207 to deflect and extend the flow path. Then, it passes through the guide plate 206 to evenly distribute the flue gas, making the flue gas evenly distributed and leading upward. Then, the electric heating tube 202 raises the temperature of the flue gas, which contacts the catalyst 2052 in the tray 205 for catalytic reduction treatment. During this process, oxygen-containing air from the outside is introduced into the inner liner 204 through the oxygen pipe 7 to ensure that there is enough oxygen to participate in the catalytic reaction.

[0039] A guide plate 303 is fixed on the inner wall of the purification tower 3, and a spray coil 302 is fixed on the inner wall of the purification tower 3 above the guide plate 303. An atomizing nozzle 3021 is fixed through the bottom of the spray coil 302.

[0040] The flue gas entering the purification tower 3 is evenly distributed and rises after passing through the guide plate 303. At this time, the atomizing nozzle 3021 under the spray coil 302 sprays ammonia water to perform secondary denitrification treatment on the flue gas.

[0041] The water storage tank 1 contains hot water, and a flue gas inlet 101 is fixedly connected to the water storage tank 1 on one side of the purification cylinder 2. The bottom end of the flue gas inlet 101 extends into the hot water in the water storage tank 1. The upper and lower ends of the inner tank 204 are connected to the purification cylinder 2, and the bottom end of the inner tank 204 is connected to the water storage tank 1.

[0042] Flue gas is directly introduced into hot water through flue gas inlet 101, generating bubbles. After the bubbles burst, the flue gas enters the inner tank 204 for denitrification treatment. During this process, the hot water design can prevent the flue gas temperature from dropping and remove particulate matter in the flue gas, thus avoiding affecting the subsequent denitrification reaction. In addition, the secondary heating of electric heating tube 202 raises the flue gas temperature to above 150°C for catalytic reduction reaction.

[0043] Each layer of baffle assembly 207 includes equidistantly distributed shafts 2071. Each shaft 2071 is fixed with two baffle plates 2072 that are centrally symmetrically distributed. The baffle plates 2072 are inclined, and the baffle plates 2072 in adjacent layers of baffle assembly 207 have opposite inclination directions.

[0044] The two ends of the shaft 2071 are fixed to the inner wall of the inner liner 204, and the baffles 2072 on its periphery are tilted, so that the flue gas is tilted upward and guided. When it passes through the upper baffle assembly 207, it is redirected again and the travel path is extended.

[0045] Both the first guide vane 206 and the second guide vane 303 are inclined, and both the first guide vane 206 and the second guide vane 303 have waist-shaped holes.

[0046] The evenly distributed waist-shaped holes allow the flue gas under the first guide plate 206 and the second guide plate 303 to flow upward evenly, so that the flue gas rises evenly.

[0047] The end of the oxygen tube 7 away from the inner liner 204 passes through the insulation cotton 203 and the purification cylinder 2 and extends out. The power receiving end of the electric heating tube 202 passes through the insulation cotton 203 and the purification cylinder 2 and extends out. A cross grid 2051 is fixed inside the tray 205, and the tray 205 outside the cross grid 2051 is filled with catalyst 2052. The bottom of the tray 205 has through holes 2053 distributed in a rectangular array.

[0048] The oxygen pipe 7 is connected to an external air input device, through which oxygen-containing air is introduced into the inner liner 204. When the flue gas comes into contact with the oxygen-containing air and is heated by the electric heating tube 202, it then passes through the through hole 2053 of the tray 205 and comes into contact with the catalyst 2052 in the tray 205 to react and achieve reduction denitrification treatment.

[0049] An air outlet hopper 201 is fixedly connected to the upper end of the inner liner 204. A smoke extraction pipe 401 is fixed to the air intake end of the fan 4, and the end of the smoke extraction pipe 401 away from the fan 4 is connected to the upper end of the air outlet hopper 201. An exhaust pipe 402 is fixed to the air outlet end of the fan 4, and the end of the exhaust pipe 402 away from the fan 4 extends into the purification tower 3, and the exhaust pipe 402 is located below the guide plate 303.

[0050] When the fan 4 is working, it extracts the flue gas after denitrification in the inner liner 204 through the smoke pipe 401, and then transports it to the bottom of the guide plate 303 in the purification tower 3 through the exhaust pipe 402. After being evenly distributed by the guide plate 303, it rises.

[0051] A water pump 6 is fixed on the side wall of the purification tower 3 away from the fan 4, and the water pump 6 is connected to the ammonia tank 5 through the water pump 6. The water pump 6 is fixed with an outlet pipe 601, and the end of the outlet pipe 601 away from the water pump 6 is connected to the spray coil 302 through the water pump 6. An air outlet hopper 2 301 is fixed through the upper end of the purification tower 3, and the upper end of the air outlet hopper 2 301 is open.

[0052] Ammonia water is drawn from ammonia tank 5 by water pump 6 (the water pump pipe of water pump 6 has been omitted), and then input into spray coil 302 through water outlet pipe 601. It is sprayed out through atomizing nozzle 3021. The ammonia water reacts with the flue gas to perform secondary denitrification treatment on the flue gas, and finally discharged from outlet hopper 2 301.

[0053] The specific working principle of this utility model is as follows: First, flue gas is directly introduced into hot water through flue gas inlet 101, generating bubbles. After the bubbles burst, the flue gas enters the inner tank 204. The hot water design prevents the flue gas temperature from dropping and removes particulate matter from the flue gas. Subsequently, the flue gas enters the inner tank 204, is deflected by the baffle assembly 207, and then evenly distributed by the guide plate 206, ensuring uniform distribution of the flue gas. It is then directed upwards, and the electric heating tube 202 further raises the flue gas temperature. Simultaneously, oxygen-containing air from outside is introduced into the inner tank 204 through the oxygen pipe 7. When the flue gas comes into contact with the oxygen-containing air and is heated by the electric heating tube 202, it... The gas then reacts with the catalyst 2052 inside the tray 205 through the through hole 2053, achieving reduction and denitrification. Subsequently, the blower 4 operates, extracting the denitrified flue gas from the inner liner 204 through the smoke pipe 401, and then transporting it to the bottom of the guide plate 303 inside the purification tower 3 through the exhaust pipe 402. After being evenly distributed by the guide plate 303, the flue gas rises. Then, the water pump 6 extracts ammonia water from the ammonia tank 5, and inputs it into the spray coil 302 through the outlet pipe 601. The ammonia water is then sprayed out through the atomizing nozzle 3021, reacting with the flue gas to perform secondary denitrification. Finally, the flue gas is discharged from the exhaust hopper 301, completing the purification process.

[0054] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. An SCR flue gas denitrification and purification treatment device, comprising a water storage tank (1), a purification cylinder (2), a purification tower (3), a blower (4), and an ammonia tank (5), characterized in that: The upper end of the water storage tank (1) is fixed with a purification cylinder (2). The water storage tank (1) and the ammonia tank (5) are arranged side by side, and a purification tower (3) is fixed through the upper end of the ammonia tank (5). A fan (4) is arranged between the purification cylinder (2) and the purification tower (3). The purification cylinder (2) is fixed with an inner liner (204), and the space between the outer wall of the inner liner (204) and the inner wall of the purification cylinder (2) is filled with heat insulation cotton (203). The inner cavity of the inner liner (204) is provided with multiple layers of equally spaced baffle components (207), and a guide plate (206) is fixed on the inner wall of the inner liner (204) above the baffle components (207). An electric heating tube (202) is fixed in the inner liner (204) above the guide plate (206), and a tray (205) is fixed in the inner liner (204) above the electric heating tube (202). An oxygen tube (7) is fixed through the side wall of the inner liner (204) between the electric heating tube (202) and the guide plate (206). A guide plate 2 (303) is fixed on the inner wall of the purification tower (3), and a spray coil (302) is fixed on the inner wall of the purification tower (3) above the guide plate 2 (303). An atomizing nozzle (3021) is fixed through the bottom of the spray coil (302).

2. The SCR flue gas denitrification and purification equipment according to claim 1, characterized in that: The water storage tank (1) contains hot water, and a flue gas inlet (101) is fixedly connected to the water storage tank (1) on one side of the purification cylinder (2), and the bottom end of the flue gas inlet (101) extends into the hot water in the water storage tank (1). The upper and lower ends of the inner liner (204) are connected to the purification cylinder (2), and the bottom end of the inner liner (204) is connected to the water storage tank (1).

3. The SCR flue gas denitrification and purification equipment according to claim 1, characterized in that: Each layer of the baffle assembly (207) includes equidistantly distributed shafts (2071), and each shaft (2071) is fixed with two baffle plates (2072) that are centrally symmetrically distributed. The baffle plates (2072) are inclined, and the baffle plates (2072) in adjacent layers of the baffle assembly (207) have opposite inclination directions.

4. The SCR flue gas denitrification and purification equipment according to claim 1, characterized in that: Both the first guide plate (206) and the second guide plate (303) are inclined, and both the first guide plate (206) and the second guide plate (303) have waist-shaped holes.

5. The SCR flue gas denitrification and purification equipment according to claim 1, characterized in that: The oxygen tube (7) extends through the insulation cotton (203) and the purification cylinder (2) at one end away from the inner liner (204). The electric heating tube (202) extends through the insulation cotton (203) and the purification cylinder (2). A cross grid (2051) is fixed inside the tray (205), and the tray (205) outside the cross grid (2051) is filled with catalyst (2052). The bottom of the tray (205) is provided with through holes (2053) arranged in a rectangular array.

6. The SCR flue gas denitrification and purification equipment according to claim 1, characterized in that: The upper end of the inner liner (204) is fixed with an air outlet hopper (201), the air intake end of the fan (4) is fixed with a smoke extraction pipe (401), and the end of the smoke extraction pipe (401) away from the fan (4) is connected to the upper end of the air outlet hopper (201). The air outlet end of the fan (4) is fixed with a smoke exhaust pipe (402), and the end of the smoke exhaust pipe (402) away from the fan (4) extends into the purification tower (3), and the smoke exhaust pipe (402) is located below the guide plate (303).

7. The SCR flue gas denitrification and purification equipment according to claim 1, characterized in that: A water pump (6) is fixed on the side wall of the purification tower (3) away from the fan (4), and the pumping end of the water pump (6) is connected to the ammonia tank (5). A water outlet pipe (601) is fixed at the outlet end of the water pump (6), and the end of the water outlet pipe (601) away from the water pump (6) is connected to the spray coil (302). An air outlet hopper (301) is fixed at the upper end of the purification tower (3), and the upper end of the air outlet hopper (301) is open.

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