Denitration equipment based on medium and low temperature denitration catalyst

Abstract

The invention relates to the technical field of flue gas purification, and discloses denitration equipment based on a medium and low temperature denitration catalyst, the denitration equipment comprises a base, a denitration tank and a mixing tank, an inner cavity of the mixing tank is fixedly connected with a segmented box, the segmented box is provided with two groups of symmetrically arranged air holes, the number of each group of air holes is a plurality, and the number of each group of air holes is a plurality of. A blocking frame is arranged in the connecting groove, sliding rails are jointly and fixedly connected to the two sides of the connecting groove, and two symmetrically-arranged electric sliding blocks are fixedly connected to the bottom face of the outer wall of the blocking frame. According to the equipment, flue gas is cut into a plurality of strands, so that the total specific surface area of the flue gas is increased, the collision probability and the contact area between the small strands of flue gas and ammonia water are increased, the ammonia water more easily permeates into the flue gas, the flue gas and the ammonia water are more uniformly mixed, and the movement path of the flue gas in air holes is longer through a spiral upward movement mode; and the retention time is correspondingly increased, so that the contact time of the flue gas and the ammonia water is more sufficient, and the chemical reaction is more sufficient.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas purification, and in particular to a denitration device based on a medium- and low-temperature denitration catalyst. Background Art

[0002] Nitrogen oxides (NOx) in flue gas are a major atmospheric pollutant that poses serious harm to human health and the environment. Flue gas denitrification technology is a technology used in flue gas purification. Flue gas denitrification refers to the process of reducing nitrogen oxides in combustion flue gas to nitrogen, thereby removing nitrogen oxides from the flue gas. According to the treatment process, it can be divided into wet denitrification and dry denitrification. Ammonia spraying technology is an efficient emission reduction method widely used in the field of flue gas purification. It uses ammonia to undergo selective catalytic reduction reaction with nitrogen oxides in flue gas to generate nitrogen and water vapor, thereby reducing the emission of nitrogen oxides.

[0003] With respect to the above-mentioned and existing related technologies, the inventors believe that the following defects often exist: when the existing flue gas is mixed with ammonia, the flue gas is often in a clumping and continuously moves upward, the contact area between the ammonia solution and the flue gas is limited, and the mixing process dominated by molecular diffusion is slow, resulting in general uniformity between the ammonia solution and the flue gas. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology has the disadvantage that the contact area between ammonia water and flue gas is limited, resulting in general uniformity of ammonia water and flue gas. For this reason, we propose a denitrification equipment based on a medium and low temperature denitrification catalyst.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a denitrification equipment based on a medium and low temperature denitrification catalyst, comprising: a base, a denitrification tank and a mixing tank, the denitrification tank and the mixing tank are respectively fixedly connected to both sides of the top surface of the base, the inner cavity of the mixing tank is fixedly connected to a segmented box, the segmented box is provided with two groups of symmetrically arranged air holes, and the number of the air holes in each group is several, the bottom of the segmented box is provided with a connecting groove, the air holes are connected to the connecting groove, a blocking frame is provided in the connecting groove, the side surface and the top surface of the outer wall of the blocking frame are respectively fitted with the side wall and the top surface of the connecting groove, and slide rails are fixedly connected to both sides of the connecting groove, the number of the slide rails is two and they are symmetrically arranged, the bottom surface of the outer wall of the blocking frame is fixedly connected to two symmetrically arranged electric sliders, the two electric sliders are respectively slidably connected to the two slide rails, a spiral blade is fixedly connected in each air hole through a mounting block, and a water spray assembly is provided on the top of the inner cavity of the mixing tank, and the water spray assembly is located on the upper side of the segmented box.

[0006] Preferably, the water spray assembly includes two water tanks and two water pumps, the two water pumps are respectively fixedly connected to the two sides of the outer wall of the mixing tank, the two water tanks are fixedly connected to the top surface of the base, the water inlet end and the water outlet end of the water pump are respectively fixedly connected to the water suction pipe and the water outlet pipe, one end of the two water suction pipes are respectively fixedly connected to the two water tanks and pass through the interior, the two water outlet pipes are respectively fixedly connected to the two sides of the mixing tank and pass through the inner cavity, one end of the two water outlet pipes are respectively fixedly connected to the first connecting pipe, the two first connecting pipes are respectively fixedly connected to a plurality of second connecting pipes, and each of the second connecting pipes is fixedly connected to a plurality of atomizing nozzles.

[0007] Preferably, each group of several second connecting pipes are symmetrically arranged and equidistantly arranged, and each group of several atomizing nozzles is a plurality of nozzles and are equidistantly arranged.

[0008] Preferably, the left and right sides of the bottom of the barrier frame are fixedly connected with an air injection pipe, one end of the air injection pipe passes through the connecting groove, one end of the air injection pipe is fixedly connected with a one-way valve, and the air inlet end of the one-way valve is fixedly connected with a cannula.

[0009] Preferably, both sides of the segmented box are fixedly connected with air intake pipes near the bottom, one end of the two air intake pipes passes through the connecting groove, one end of the two air intake pipes is fixedly connected with a quick connector, the quick connector includes a pipe joint, the middle part of the pipe joint is fixedly connected with a partition, the middle part of the partition is provided with a through hole, four connecting rods arranged in a circle are fixedly connected to the partition, one end of the four connecting rods is commonly fixedly connected to a baffle, the baffle is inserted in the through hole, one end of the four connecting rods is provided with a spring, the two ends of the spring are respectively fixedly connected to one side of the partition and one end of the connecting rod.

[0010] Preferably, two air storage tanks are fixedly connected to the top surface of the base, and first air pumps are fixedly connected to both sides of the outer wall of the mixing tank, and the air inlet ends of the two first air pumps are fixedly connected to air suction pipes, one end of the two air suction pipes are respectively fixedly connected to the two air storage tanks and pass through the inner cavity, the other ends of the two air inlet pipes are respectively fixedly connected to both sides of the mixing tank and pass through to the outside, and the other ends of the two air inlet pipes are respectively fixedly connected to the air outlet ends of the two first air pumps.

[0011] Preferably, a heater and a catalyst plate are fixedly connected to the inner cavity of the de-pinning tank, the heater is arranged on the upper side of the catalyst plate, and the number of the catalyst plates is several and they are arranged in an upper and lower manner.

[0012] Preferably, a connecting pipe is fixedly connected to the top of one side of the mixing tank, and one end of the connecting pipe is fixedly connected to the top of one side of the depinning tank and passes through the inner cavity.

[0013] Preferably, a mixer and a second air pump are fixedly connected to the inner cavity of the mixing tank, the mixer is arranged on the upper side of the second connecting pipe, and the second air pump is arranged between the second connecting pipe and the mixer.

[0014] Preferably, a smoke inlet pipe is fixedly connected to the bottom of the mixing tank, one end of which passes through the inner cavity of the mixing tank, and a gas exhaust pipe and a liquid exhaust pipe are fixedly connected to one side of the de-pinning tank near the bottom, and the gas exhaust pipe is arranged on the upper side of the liquid exhaust pipe.

[0015] Technical effects and advantages of the present invention: In the present invention, by cutting the flue gas into multiple streams, the total specific surface area of ​​the flue gas is increased, the collision probability and contact area between the small streams of flue gas and the ammonia droplets are improved, and the ammonia droplets can penetrate into the flue gas more easily, thereby enhancing the uniformity of the mixing of the flue gas and the ammonia droplets.

[0016] In the present invention, the spiral upward movement mode makes the movement path of the smoke in the pores longer and the residence time correspondingly increased, so that the smoke and ammonia water have more sufficient contact time and the chemical reaction between the two can proceed more fully. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components: Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a structural schematic diagram of the de-pinning tank in the present invention; Figure 4 It is a structural schematic diagram of the mixing tank in the present invention; Figure 5 The structure of the segmented box in the present invention is shown as follows Figure 1 ; Figure 6 The structure of the segmented box in the present invention is shown in FIG. Figure 2 ; Figure 7 Schematic diagram of the structure of the spiral blade in the present invention; Figure 8 Schematic diagram of the structure of the barrier frame in the present invention; Figure 9 This is a schematic structural diagram of the first connecting pipe and the second connecting pipe in the present invention; Figure 10Schematic diagram of the structure of the quick connector in the present invention; Figure 11 Schematic diagram of the explosion of the partition in the present invention.

[0018] Legend: 1. Base; 2. Detachable tank; 3. Mixing tank; 4. Segment box; 5. Air hole; 6. Connecting groove; 7. Blocking frame; 8. Slide rail; 9. Electric slider; 10. Spiral blade; 11. Water spray assembly; 111. Water storage tank; 112. Water pump; 113. Water pump pipe; 114. Water outlet pipe; 115. First connecting pipe; 116. Second connecting pipe; 117. Atomizing nozzle; 12. Air injection pipe; 13. One-way valve; 14 , intubation; 15. air inlet pipe; 16. quick connector; 161. pipe joint; 162. partition; 163. through hole; 164. connecting rod; 165. baffle; 166. spring; 17. gas storage tank; 18. first vacuum pump; 19. vacuum pipe; 20. heater; 21. catalyst plate; 22. connecting pipe; 23. mixer; 24. second vacuum pump; 25. smoke inlet pipe; 26. gas exhaust pipe; 27. liquid exhaust pipe. DETAILED DESCRIPTION

[0019] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0020] Reference Figure 1-11 As shown, the present invention provides a technical solution: a denitration device based on a medium and low temperature denitration catalyst, comprising: a base 1, a denitration tank 2 and a mixing tank 3, the denitration tank 2 and the mixing tank 3 are fixedly connected to both sides of the top surface of the base 1, the inner cavity of the mixing tank 3 is fixedly connected to a segmented box 4, the segmented box 4 is provided with two groups of symmetrically arranged air holes 5, the number of each group of air holes 5 is several, the bottom of the segmented box 4 is provided with a connecting groove 6, the air holes 5 are connected to the connecting groove 6, and a blocking frame 7 is provided in the connecting groove 6 to block the air holes 5. The side surface and top surface of the outer wall of the partition frame 7 are respectively fitted with the side wall and top surface of the connecting groove 6. The two sides of the connecting groove 6 are commonly fixedly connected with slide rails 8. There are two slide rails 8 and they are symmetrically arranged. The bottom surface of the outer wall of the blocking frame 7 is fixedly connected with two symmetrically arranged electric sliders 9. The two electric sliders 9 are respectively slidably connected to the two slide rails 8. A spiral blade 10 is fixedly connected to each air hole 5 through a mounting block. A water spray assembly 11 is provided at the top of the inner cavity of the mixing tank 3. The water spray assembly 11 is located on the upper side of the segmented box 4.

[0021] The water spray assembly 11 includes two water tanks 111 and two water pumps 112. The two water pumps 112 are respectively fixedly connected to the two sides of the outer wall of the mixing tank 3. The two water tanks 111 are both fixedly connected to the top surface of the base 1. The water inlet end and the water outlet end of the water pump 112 are respectively fixedly connected to the water suction pipe 113 and the water outlet pipe 114. One end of the two water suction pipes 113 is respectively fixedly connected to the two water tanks 111 and passes through the interior. The two water outlet pipes 114 are respectively fixedly connected to the two sides of the mixing tank 3 and pass through the inner cavity. One end of the two water outlet pipes 114 is fixedly connected to the first connecting pipe 115. The two first connecting pipes 115 are both fixedly connected to a number of second connecting pipes 116. Each second connecting pipe 116 is fixedly connected to a number of atomizing nozzles 117. The water pump 112 extracts ammonia water from the water tank 111 through the second connecting pipe 116 and injects the ammonia water into the first connecting pipe 115 and the second connecting pipe 116 in sequence, and finally sprays the ammonia water out in a mist form through the atomizing nozzle 117.

[0022] Each group of multiple second connecting pipes 116 is symmetrically arranged and equidistantly spaced. Each group of multiple atomizing nozzles 117 is also symmetrically spaced and equidistantly spaced. Each air hole 5 has a second connecting pipe 116 on both sides, and each air hole 5 has two atomizing nozzles 117 on both sides. The two symmetrical atomizing nozzles 117 spray ammonia water onto the flue gas discharged from the air hole 5 from both sides.

[0023] Gas injection pipes 12 are fixedly connected to both the left and right sides of the bottom of the barrier frame 7. One end of the gas injection pipe 12 extends into the connecting groove 6. A one-way valve 13 is fixedly connected to one end of the gas injection pipe 12, and a cannula 14 is fixedly connected to the air inlet end of the one-way valve 13. Oxygen can be injected into the cannula 14, and the oxygen flows through the one-way valve 13 and the gas injection pipe 12, and finally flows into the barrier frame 7. The oxygen entering the barrier frame 7 flows upward, so that even if the bottom of the air hole 5 is blocked, the smoke can still flow upward in the air hole 5.

[0024] Both sides of the segmented box 4 and near the bottom are fixedly connected with an air intake pipe 15, one end of the two air intake pipes 15 passes through the connecting groove 6, and one end of the two air intake pipes 15 is fixedly connected with a quick connector 16, which includes a pipe joint 161, a partition 162 is fixedly connected to the middle part of the pipe joint 161, a through hole 163 is opened in the middle part of the partition 162, four connecting rods 164 arranged in a circle are fixedly connected to the partition 162, one end of the four connecting rods 164 is fixedly connected to a baffle 165, the baffle 165 is inserted in the through hole 163, and one end of the four connecting rods 164 is provided with a spring 166, and the two ends of the spring 166 are respectively fixedly connected to one side of the partition 162 and one end of the connecting rod 164. When the blocking frame 7 moves to one side, the cannula 14 can be inserted into the quick connector 16. After the cannula 14 is inserted into the pipe connector 161, it will push the connecting rod 164 to move, so that the baffle 165 is moved out of the through hole 163, so that the oxygen in the pipe connector 161 can pass through the through hole 163 and be injected into the cannula 14. When the cannula 14 is pulled out of the pipe connector 161, the spring 166 pushes the connecting rod 164 to move, so that the baffle 165 is reinserted into the through hole 163, and the quick connector 16 is closed. In this way, the quick connector 16 can be automatically opened for gas injection or closed for no longer gas injection.

[0025] Two gas storage tanks 17 are fixedly connected to the top surface of the base 1. First air pumps 18 are fixedly connected to both sides of the outer wall of the mixing tank 3. The air inlet ends of the two first air pumps 18 are fixedly connected to air extraction pipes 19. One end of the two air extraction pipes 19 is fixedly connected to the two gas storage tanks 17 and passes through the inner cavity. The other ends of the two air inlet pipes 15 are fixedly connected to both sides of the mixing tank 3 and pass through to the outside. The other ends of the two air inlet pipes 15 are fixedly connected to the air outlet ends of the two first air extraction pumps 18. Oxygen is stored in the gas storage tanks 17. The first air pumps 18 extract the oxygen in the gas storage tanks 17 through the air extraction pipes 19 and discharge the extracted oxygen into the air inlet pipes 15.

[0026] A heater 20 and catalyst plates 21 are fixedly connected to the interior of the denitrification tank 2. The heater 20 is located above the catalyst plates 21. Several catalyst plates 21 are arranged in an upper and lower arrangement. Upon entering the denitrification tank 2, the flue gas is first heated by the heater 20 before being catalyzed by the catalyst plates 21.

[0027] A connecting pipe 22 is fixedly connected to the top of one side of the mixing tank 3. One end of the connecting pipe 22 is fixedly connected to the top of one side of the desulfurization tank 2 and penetrates into the inner cavity. The mixed flue gas in the mixing tank 3 enters the desulfurization tank 2 through the connecting pipe 22.

[0028] The inner cavity of the mixing tank 3 is fixedly connected to a mixer 23 and a second air pump 24. The mixer 23 is arranged on the upper side of the second connecting pipe 116, and the second air pump 24 is arranged between the second connecting pipe 116 and the mixer 23. The second air pump 24 pumps the flue gas upward and mixes the flue gas with ammonia water through the mixer 23.

[0029] A smoke inlet pipe 25 is fixedly connected to the bottom of the mixing tank 3. One end of the smoke inlet pipe 25 extends into the inner cavity of the mixing tank 3. A gas discharge pipe 26 and a liquid discharge pipe 27 are fixedly connected to one side of the de-pinning tank 2 near the bottom. The gas discharge pipe 26 is located above the liquid discharge pipe 27. Flue gas enters the mixing tank 3 through the smoke inlet pipe 25. After the flue gas is purified, nitrogen and water are produced. The purified flue gas and nitrogen are discharged through the gas discharge pipe 26, and the water is discharged through the liquid discharge pipe 27.

[0030] Working Principle: Initially, the flue gas is introduced into the bottom area of ​​the mixing tank 3 through the smoke inlet pipe 25. Subsequently, the flue gas flows from bottom to top and enters the interior of the connected segmentation box 4. Inside the segmentation box 4, the flue gas is divided into multiple independent airflows through the multiple air holes 5 distributed therein. Simultaneously, the electric slider 9 slides on the slide rail 8, and this movement drives the movement of the baffle frame 7 connected to it. When the baffle frame 7 moves to one side of the segmentation box 4, it completely covers and blocks all the air holes 5 on that side, thereby cutting off the flow of flue gas through these air holes 5. This operation cuts the flue gas in the air holes 5 on that side into independent sections. The cut-off flue gas continues its upward path, and when the flue gas flows out from the top of the air holes 5, the atomizing nozzle 117 sprays ammonia water to mix with the flue gas. Because the flue gas is cut into multiple streams, its total specific surface area, that is, the surface area per unit volume of flue gas, increases significantly. This results in a significant increase in the collision probability and contact area between small streams of smoke and ammonia droplets, allowing ammonia to more easily penetrate into the smoke, thereby enhancing the uniformity of the mixing of smoke and ammonia. In addition, when the smoke flows upward in the pore 5, it is affected by the spiral blades 10, producing a spiral upward motion. Compared with linear flow, this spiral upward motion makes the smoke movement path in the pore 5 longer and the residence time is correspondingly increased. This provides more sufficient contact time for the smoke and ammonia, thereby allowing the chemical reaction between the two to proceed more fully.

[0031] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A denitration device based on a medium and low temperature denitration catalyst, characterized in that: include: The bottom surface of the mixing tank is fixedly connected to the bottom surface of the mixing tank, and the bottom surface of the mixing tank is fixedly connected to the bottom surface of the mixing tank. The mixing tank has two symmetrically arranged air holes, and the number of air holes in each group is several. The bottom of the mixing tank is provided with a connecting groove, and the air holes are connected to the connecting groove. A blocking frame is provided in the connecting groove, and the side surface and top surface of the outer wall of the blocking frame are respectively fitted with the side wall and top surface of the connecting groove. The two sides of the connecting groove are fixedly connected with slide rails, and the number of the slide rails is two and they are symmetrically arranged. The bottom surface of the outer wall of the blocking frame is fixedly connected to two symmetrically arranged electric sliders, and the two electric sliders are slidably connected to the two slide rails respectively. A spiral blade is fixedly connected to each air hole through a mounting block. A water spray assembly is provided on the top of the inner cavity of the mixing tank, and the water spray assembly is located on the upper side of the segmented box.

2. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 1 is characterized in that: The water spray assembly includes two water tanks and two water pumps, the two water pumps are respectively fixedly connected to the two sides of the outer wall of the mixing tank, the two water tanks are fixedly connected to the top surface of the base, the water inlet end and the water outlet end of the water pump are respectively fixedly connected to the water suction pipe and the water outlet pipe, one end of the two water suction pipes are respectively fixedly connected to the two water tanks and pass through the interior, the two water outlet pipes are respectively fixedly connected to the two sides of the mixing tank and pass through the inner cavity, one end of the two water outlet pipes are respectively fixedly connected to the first connecting pipe, the two first connecting pipes are fixedly connected to a plurality of second connecting pipes, and each of the second connecting pipes is fixedly connected to a plurality of atomizing nozzles.

3. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 2 is characterized in that: The second connecting pipes in each group are symmetrically arranged and equidistantly arranged, and the atomizing nozzles in each group are multiple and equidistantly arranged.

4. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 1, characterized in that: The left and right sides of the bottom of the barrier frame are fixedly connected with an air injection pipe, one end of the air injection pipe passes through the connecting groove, one end of the air injection pipe is fixedly connected with a one-way valve, and the air inlet end of the one-way valve is fixedly connected with a cannula.

5. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 1 is characterized in that: Air intake pipes are fixedly connected to both sides of the segmented box near the bottom, one end of the two air intake pipes passes through the connecting groove, one end of the two air intake pipes is fixedly connected to a quick connector, the quick connector includes a pipe joint, the middle part of the pipe joint is fixedly connected to a partition, the middle part of the partition is provided with a through hole, four connecting rods arranged in a circle are fixedly connected to the partition, one end of the four connecting rods is commonly fixedly connected to a baffle, the baffle is inserted in the through hole, one end of the four connecting rods is provided with a spring, the two ends of the spring are respectively fixedly connected to one side of the partition and one end of the connecting rod.

6. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 5 is characterized in that: Two air storage tanks are fixedly connected to the top surface of the base, and first air pumps are fixedly connected to both sides of the outer wall of the mixing tank. The air inlet ends of the two first air pumps are fixedly connected to air extraction pipes, one end of the two air extraction pipes are respectively fixedly connected to the two air storage tanks and pass through the inner cavity, the other ends of the two air inlet pipes are respectively fixedly connected to both sides of the mixing tank and pass through to the outside, and the other ends of the two air inlet pipes are respectively fixedly connected to the air outlet ends of the two first air pumps.

7. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 1, characterized in that: A heater and a catalyst plate are fixedly connected to the inner cavity of the de-pinning tank. The heater is arranged on the upper side of the catalyst plate. There are several catalyst plates arranged in an upper and lower manner.

8. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 1, characterized in that: A connecting pipe is fixedly connected to the top of one side of the mixing tank, and one end of the connecting pipe is fixedly connected to the top of one side of the pin-off tank and passes through the inner cavity.

9. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 1, characterized in that: The inner cavity of the mixing tank is fixedly connected with a mixer and a second air pump. The mixer is arranged on the upper side of the second connecting pipe, and the second air pump is arranged between the second connecting pipe and the mixer.

10. The denitration equipment based on a medium- and low-temperature denitration catalyst according to claim 1, characterized in that: A smoke inlet pipe is fixedly connected to the bottom of the mixing tank, one end of which passes through the inner cavity of the mixing tank. A gas exhaust pipe and a liquid exhaust pipe are fixedly connected to one side of the de-pinning tank near the bottom, and the gas exhaust pipe is arranged on the upper side of the liquid exhaust pipe.

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