A dilute nitric acid absorption tower

Abstract

The present application belongs to the technical field of dilute nitric acid, and particularly relates to a dilute nitric acid absorption tower, which comprises a blower, a water pool, a support, a connecting pipeline, a partition plate installation pipeline, a water pipe, a pump, a first side baffle and a second side baffle. The water flowing into the drainage structure is subjected to heat dissipation treatment for the heat generated by the reaction of nitrogen oxides and water in the absorption tower during the downward flow along the inner wall of the drainage structure. The water flowing out of the drainage structure flows into the arc-shaped drainage plate and then flows to the outer side wall of the corresponding partition plate installation pipeline under the guidance of the arc-shaped drainage plate, so that the heat generated by the reaction of nitrogen oxides and water in the absorption tower is further subjected to heat dissipation treatment. The water flowing down along the partition plate installation pipeline freely falls back into the water pool, and the water absorbs and dissipates the heat in contact with air during the free falling. The special cooling water production device is not needed, and the energy-saving effect is relatively strong.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dilute nitric acid, and particularly relates to a dilute nitric acid absorption tower. BACKGROUND

[0002] The nitric acid absorption tower can absorb nitrogen oxides from the lower side blown by the air blower, and then absorb the absorption liquid (generally water) from the upper stream, and the absorption tower has multiple layers of porous partitions, and the partitions are filled with fillers; the water and the nitrogen oxides can be fully contacted and dissolved.

[0003] The absorption tower is generally a high and cylindrical shape, and has a large diameter and a thin wall; after the internal partitions are filled, the partitions become heavy, and the lower wall surface is often severely deformed due to the self weight; if the wall thickness is increased, the overall weight is also increased, which leads to an increase in cost on the one hand, and is inconvenient for carrying and assembling on the other hand.

[0004] In addition, heat is generated when the nitrogen oxides in the absorption tower react with water, and the absorption efficiency can be greatly improved if the heat is promptly dissipated; currently, a cooling structure is designed at the partition to promptly absorb the generated heat, and a cooling machine is needed to generate cooling water in the cooling structure, and a large amount of electric energy is consumed in the cooling process.

[0005] The application designs a dilute nitric acid absorption tower to solve the above problems. SUMMARY

[0006] In order to achieve the above purpose, the application adopts the following technical scheme:

[0007] A dilute nitric acid absorption tower, which comprises an air blower, a water pool, a support, a connecting pipeline, a partition installation pipeline, a water pipe, a pump, a first side baffle and a second side baffle, wherein the upper side of a bottom plate is provided with the water pool, four partition installation pipelines and three connecting pipelines are alternately and sequentially arranged in a stepped shape and detachably installed on the upper side of the bottom plate, a plurality of circular water outlet holes are uniformly arranged on the upper side of each partition installation pipeline; a support is detachably installed on the lower side of each partition installation pipeline above the second partition installation pipeline from bottom to top, the air blower is installed on the upper side of the bottom plate, and the output end of the air blower is connected with the lowermost partition installation pipeline; a plurality of partitions provided with circular through holes are detachably installed in each partition installation pipeline in a uniform manner from top to bottom, and fillers for facilitating the contact and dissolution of water and nitrogen oxides are installed between the partitions; two first side baffles are symmetrically installed on the upper end of each partition installation pipeline, two second side baffles are symmetrically installed on the upper end of each connecting pipeline, and the adjacent first side baffles and second side baffles are fixedly connected through bolts; the front side of the two first side baffles installed on the lowermost partition installation pipeline is sealed through a front baffle, and the rear side of the two first side baffles installed on the uppermost partition installation pipeline is sealed through a front baffle.

[0008] The pump is installed in the pool, the output end of the pump is provided with a water pipe, and the water pipe extends upwards and is bent on the upper side of the two first side baffles and is inserted between the two first side baffles.

[0009] As a preferred scheme, the two sides of the adjacent partition plate mounting pipe and the connecting pipe are fixedly connected by a plurality of uniformly distributed bolts.

[0010] As a preferred scheme, a square connecting port for communicating with the upper connecting pipe is formed in the side wall of the upper end of the partition plate mounting pipe located at the lowermost side, and a square connecting port for communicating with the lower connecting pipe is formed in the side wall of the lower end of the partition plate mounting pipe located at the uppermost side; two square connecting ports for communicating with the upper and lower two connecting pipes are formed in the upper and lower two side walls of each partition plate mounting pipe in the remaining two partition plate mounting pipes.

[0011] As a preferred scheme, the partition plate installed in the partition plate mounting pipe located at the lowermost side is located between the square connecting port of the partition plate mounting pipe and the connecting point of the blower output end and the partition plate mounting pipe; the partition plate installed in the two partition plate mounting pipes located in the middle is located between the upper and lower two square connecting ports in the corresponding partition plate mounting pipe; and the partition plate installed in the partition plate mounting pipe located at the uppermost side is located on the upper side of the square connecting port of the partition plate mounting pipe.

[0012] As a preferred scheme, the square pipe of the connecting pipe is provided with uniformly distributed square ports on the upper and lower two end faces, and a drainage baffle is fixedly installed on the front and rear sides of each square port; an arc-shaped drainage plate is installed on the lower side of the connecting pipe, and the lower end of the arc-shaped drainage plate is close to the outer wall surface of the partition plate mounting pipe located at the front side; the arc-shaped drainage plate is provided with side baffles on the two sides of the arc-shaped drainage plate, and the side baffles wrap the two sides of the arc-shaped drainage plate; a plurality of drainage structures arranged in the airflow direction are uniformly fixedly installed in the connecting pipe, the drainage structures are in a horn shape, the width of the upper end of the drainage structure is greater than the width of the lower end, the drainage structure corresponds to the square port on the connecting pipe, the upper end of the drainage structure is aligned with the square port on the upper end of the connecting pipe, and the lower end of the drainage structure is aligned with the square port on the lower end of the connecting pipe.

[0013] As a preferred scheme, a plurality of circular rib columns are fixedly installed on the two sides of each drainage structure, and the circular rib columns on adjacent two drainage structures are distributed in a staggered manner.

[0014] Compared with the prior art, the present application has the following advantages:

[0015] 1. In this invention, the support, connecting pipe, partition installation pipe, first side baffle and second baffle are all detachable. During use, the components are connected and fixed together by bolts. During transportation, each component is an individual unit with a relatively small volume, making transportation convenient. That is, the absorption tower designed in this invention is an assembly structure, which is easy to install and transport.

[0016] 2. This invention designs the absorption tower in a stepped shape. A support bracket is installed on the underside of each partition mounting pipe, distributing the weight of the absorption tower and its internal structure across these brackets. This invention solves the problem of traditional absorption towers being prone to deformation due to their large diameter and thin walls by using low-cost supports and a stepped tower design. In this invention, each partition mounting pipe is equipped with a support bracket, ensuring that even with a large cross-section and thin walls, the partition mounting pipe will not deform due to its weight.

[0017] 3. In this invention, the water flowing into the diversion structure dissipates the heat generated by the reaction of nitrogen oxides and water in the absorption tower as it flows downward along the inner wall of the diversion structure. The water flowing out of the diversion structure flows into the arc-shaped diversion plate and, guided by the arc-shaped diversion plate, flows to the outer wall of the corresponding baffle installation pipe, further dissipating the heat generated by the reaction of nitrogen oxides and water in the absorption tower. The water flowing down along the baffle installation pipe falls freely back into the water pool. During the free fall, the water comes into contact with the air and dissipates the absorbed heat. No special cooling water production device is required, resulting in strong energy-saving effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall component appearance.

[0019] Figure 2 This is a schematic diagram of the overall component distribution.

[0020] Figure 3 This is a schematic diagram of the distribution at the upper end of the water pipes.

[0021] Figure 4 This is a diagram showing the installation of the partition.

[0022] Figure 5 This is a schematic diagram of the blower structure.

[0023] Figure 6 This is a schematic diagram of a pipe structure with a partition.

[0024] Figure 7 This is a schematic diagram of the partition installation of pipes and the connection of connecting pipes.

[0025] Figure 8 This is a diagram showing the installation of a blower.

[0026] Figure 9 is a schematic diagram of the installation of the drainage structure.

[0027] Figure 10 is a schematic diagram of the structure of the drainage structure.

[0028] Figure 11 is a schematic diagram of the connecting pipe structure.

[0029] Figure 12 is a schematic diagram of the side baffle structure.

[0030] Figure label name: 1, blower; 2, water tank; 3, support; 4, connecting pipe; 5, partition installation pipe; 6, water pipe; 7, pump; 8, first side baffle; 9, second side baffle; 10, drain hole; 11, partition; 12, square connecting port; 13, drainage baffle; 14, drainage structure; 15, bottom plate; 16, arc-shaped drainage plate; 17, circular rib column; 18, front baffle; 19, exhaust hole. DETAILED DESCRIPTION

[0031] The specific embodiments of the present application will be further described in detail below in conjunction with the drawings and examples. The following examples or drawings are used to illustrate the present application, but not to limit the scope of the present application.

[0032] A dilute nitric acid absorption tower, as shown in Figure 1 , 2 , comprises a blower 1, a water tank 2, a support 3, a connecting pipe 4, a partition installation pipe 5, a water pipe 6, a pump 7, a first side baffle 8, and a second side baffle 9, wherein the upper side of the bottom plate 15 is provided with the water tank 2, and four partition installation pipes 5 and three connecting pipes 4 are alternately and sequentially installed in a stepped manner on the upper side of the bottom plate 15, as shown in Figure 7 , the two sides of adjacent partition installation pipes 5 and connecting pipes 4 are fixedly connected by a plurality of evenly distributed bolts; the upper side of each partition installation pipe 5 is uniformly provided with a plurality of circular drain holes 10; as shown in Figure 1 , 2 , a support 3 is detachably installed on the lower side of all partition installation pipes 5 above the second partition installation pipe 5 from bottom to top, and the bottom of the support 3 is bolted to the upper side of the bottom plate 15; the blower 1 is installed on the upper side of the bottom plate 15, as shown in Figure 4 , 5 , the output end of the blower 1 is connected to the lowermost partition installation pipe 5; as shown in Figure 1 , 6As shown, the side wall of the upper end of the partition mounting pipe 5 of the lowermost side is provided with a square connecting port 12 for communicating with the upper connecting pipe 4, and the side wall of the lower end of the partition mounting pipe 5 of the uppermost side is provided with a square connecting port 12 for communicating with the lower connecting pipe 4; the side walls of the upper and lower ends of each partition mounting pipe 5 in the remaining two partition mounting channels are provided with two square connecting ports 12 for communicating with the upper and lower connecting pipes 4; a plurality of partitions 11 provided with circular through holes are detachably mounted in each partition mounting pipe 5; a filler for facilitating the contact and dissolution of water and nitrogen oxides is mounted between the partitions 11; the partitions 11 mounted in the partition mounting pipe 5 of the lowermost side are located between the square connecting port 12 of the partition mounting pipe 5 and the connecting point of the partition mounting pipe 5 and the output end of the blower 1; the partitions 11 mounted in the partition mounting pipes 5 of the middle two are located between the upper and lower square connecting ports 12 in the corresponding partition mounting pipes 5; the partitions 11 in the partition mounting pipe 5 of the uppermost side are located on the upper side of the square connecting port 12 of the partition mounting pipe 5; the side wall of the upper end of the partition mounting pipe 5 of the uppermost side is provided with an exhaust hole 19; as Figure 11 As shown, the square pipe of the connecting pipe 4 is provided with uniformly distributed square ports on the upper and lower end faces, and each square port is fixedly mounted with a drainage baffle 13 on the front and rear sides; the lower side of the connecting pipe 4 is mounted with an arc-shaped drainage plate 16, and the lower end of the arc-shaped drainage plate 16 is close to the outer wall surface of the front partition mounting pipe 5; the arc-shaped drainage plate 16 is provided with side baffles on both sides to wrap the both sides of the arc-shaped drainage plate 16; as Figure 9 As shown, a plurality of drainage structures 14 arranged in the direction of airflow are fixedly mounted in the connecting pipe 4, Figure 10 As shown, the drainage structure 14 is in the shape of a horn, the width of the upper end of the drainage structure 14 is greater than that of the lower end, the drainage structure 14 corresponds to the square ports opened on the connecting pipe 4, the upper end of the drainage structure 14 is aligned with the square port corresponding to the upper end of the connecting pipe 4, and the lower end of the drainage structure 14 is aligned with the square port corresponding to the lower end of the connecting pipe 4; a plurality of circular rib columns 17 are fixedly mounted on both sides of each drainage structure 14, and the circular rib columns 17 on adjacent two drainage structures 14 are distributed in a staggered manner; as Figure 1 、 3 As shown, two first side baffles 8 are symmetrically mounted on both sides of the upper end of each partition mounting pipe 5, two second side baffles 9 are symmetrically mounted on both sides of the upper end of each connecting pipe 4, and adjacent first side baffles 8 and second side baffles 9 are fixedly connected through bolts; the front side of the two first side baffles 8 mounted on the partition mounting pipe 5 of the lowermost side is sealed by a front baffle 18, and the rear side of the two first side baffles 8 mounted on the partition mounting pipe 5 of the uppermost side is sealed by a front baffle 18.

[0033] The support 3, the connecting pipe 4, the partition plate mounting pipe 5, the first side baffle 8 and the second baffle in the present application are detachably connected, and are fixed by bolts between each component during use; during transportation, each component is a single individual, and the volume is relatively small, and transportation is relatively convenient; that is, the absorption tower designed in the present application is a assembled structure, and is easy to install and transport.

[0034] The tower type of the absorption tower is designed into a ladder shape in the present application, and a support 3 for supporting the partition plate mounting pipe 5 is mounted on the lower side of each partition plate 11 and the partition plate mounting pipe 5, so that the weight of the absorption tower and the internal structure thereof is dispersed to each support 3; the problem of deformation of the traditional absorption tower due to a large cylinder and a thin wall is solved by using a low-cost support 3 and a ladder-shaped absorption tower in the present application. Each partition plate mounting pipe 5 is provided with a support 3 in the present application, so that even if the cross section of the partition plate mounting pipe 5 is large and the wall is thin, deformation due to weight will not occur.

[0035] The water tank 2 is arranged on the upper side of the bottom plate 15 in the present application, water in the water tank 2 is pumped to the uppermost partition plate mounting pipe 5 by the pump 7, the pumped water flows along the first side baffle 8 and the second side baffle 9 to the upper side of each partition plate mounting pipe 5, part of the water flows into the partition plate mounting pipe 5 through the water outlet hole 10 on the upper end face of the partition plate mounting pipe 5 and reacts with the nitrogen oxide blown from below; the other part of the water flows into the drainage structure 14 in the connecting pipe 4 and flows downward along the inner wall surface of the drainage structure 14, and the heat generated during the reaction of the nitrogen oxide and the water is dissipated, so that an additional cooling structure is not needed, and electric energy is saved.

[0036] The water flowing into the drainage structure 14 is subjected to heat dissipation treatment of the heat generated during the reaction of the nitrogen oxide and the water in the absorption tower during the downward flow along the inner wall surface of the drainage structure 14; the water flowing out of the drainage structure 14 flows into the arc-shaped drainage plate 16, and flows to the outer side wall of the corresponding partition plate mounting pipe 5 under the guidance of the arc-shaped drainage plate 16, and the heat generated during the reaction of the nitrogen oxide and the water in the absorption tower is further subjected to heat dissipation treatment; and the water flowing downward along the partition plate mounting pipe 5 freely falls back into the water tank 2, and the heat absorbed by the water is dissipated during the free falling process; a special cooling water production device is not needed, and the energy saving effect is strong.

[0037] In this invention, a flow-guiding baffle 13 is installed at both ends of the square opening at the upper end of the connecting pipe 4. The flow-guiding baffle 13 can act as a barrier to the water flowing down from the partition pipe 5, so that the water flows into the flow-guiding structure 14 from both sides of the flow-guiding baffle 13, instead of flowing directly into the end of the flow-guiding structure 14. This design can ensure that the water can flow into the flow-guiding structure 14 evenly and ensure the uniformity of heat absorption in the absorption tower by the water flowing into the flow-guiding structure 14.

[0038] The circular ribs 17 installed on the outside of the drainage structure 14 serve to increase the uniformity of heat dissipation.

[0039] like Figure 1 , 3 As shown, a pump 7 is installed in the water tank 2, and a water pipe 6 is installed at the output end of the pump 7. The water pipe 6 extends upward and bends on the uppermost two first side baffles 8 and inserts between the two first side baffles 8.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

[0041] Implementation: When using the absorption tower designed in this invention, the pump 7 and blower 1 are operated. The blower 1 blows in gaseous nitrogen oxides, and the pump 7 draws water from the water tank 2 onto the uppermost baffle mounting pipe 5. The drawn water flows along the first side baffle 8 and the second side baffle 9 to the upper side of each baffle mounting pipe 5. Part of the water flows into the baffle mounting pipe 5 through the drain hole 10 on the upper surface of the baffle mounting pipe 5 and reacts with the nitrogen oxides blown up from below. The other part of the water flows into the drainage structure 14 in the connecting pipe 4 and flows downward along the inner wall of the drainage structure 14, reacting with the nitrogen oxides. The heat generated when oxides and water react is dissipated. Water flowing out of the drainage structure 14 flows into the arc-shaped drainage plate 16 and, guided by the arc-shaped drainage plate 16, flows to the outer wall of the corresponding baffle mounting pipe 5, further dissipating the heat generated by the reaction of nitrogen oxides and water in the absorption tower. The water flowing down along the baffle mounting pipe 5 falls freely back into the water pool 2. During the free fall, the water comes into contact with the air and dissipates the absorbed heat. No special cooling water production device is required, resulting in strong energy-saving effect. The dissipated gas flows upward and finally exits from the exhaust port on the uppermost baffle mounting pipe 5.

Claims

1. A dilute nitric acid absorption column characterized by: It includes air blower, water pool, support, connecting pipe, partition installation pipe, water pipe, pump, first side baffle, second side baffle, wherein the upper side of the bottom plate is provided with the water pool, four partition installation pipes and three connecting pipes are alternately installed on the upper side of the bottom plate in a stepped shape, a plurality of circular downcomer holes are uniformly formed on the upper side of each partition installation pipe, a support is detachably installed on the lower side of all partition installation pipes above the second partition installation pipe from bottom to top, the air blower is installed on the upper side of the bottom plate, and the output end of the air blower is connected with the lowermost partition installation pipe. The pump is installed in the water pool, the water pipe is installed on the output end of the pump, and the water pipe is bent and inserted between the two first side baffles on the upper side of the uppermost two first side baffles. A square connecting port for communicating with the upper connecting pipe is formed in the side wall of the upper end of the lowermost partition installation pipe, and a square connecting port for communicating with the lower connecting pipe is formed in the side wall of the lower end of the uppermost partition installation pipe. The square pipe of the connecting pipe is provided with square ports uniformly distributed on the upper and lower end faces, and a drainage baffle is fixedly installed on the front and rear sides of each square port.

2. A dilute nitric acid absorption column according to claim 1, characterized in that: The lower side of the connecting pipe is provided with an arc-shaped drainage plate, the lower end of the arc-shaped drainage plate is close to the outer wall surface of the front partition installation pipe, and side baffles are arranged on the two sides of the arc-shaped drainage plate. The two sides of adjacent partition installation pipes and connecting pipes are fixedly connected through a plurality of evenly distributed bolts.

3. A dilute nitric acid absorption tower according to claim 1, characterized in that: The lowermost baffle installed in the baffle installation pipe is located between the square connecting port of the baffle installation pipe and the connecting point of the baffle installation pipe and the blower output end; the two baffles installed in the middle baffle installation pipes are located between the upper and lower square connecting ports in the corresponding baffle installation pipe; and the uppermost baffle installed in the baffle installation pipe is located above the square connecting port of the baffle installation pipe.

4. A dilute nitric acid absorption tower according to claim 1, characterized in that: Each of the drainage structures is fixedly installed with a plurality of circular rib columns on both sides, and the circular rib columns on adjacent two drainage structures are distributed in a staggered manner.

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