Absorption tower for nitric acid production

Abstract

The utility model discloses an absorption tower for nitric acid production, which comprises a tower body and a cooling device, a plurality of sieve plates are vertically arranged in the tower body, downcomers are arranged on the vertically adjacent sieve plates in a staggered manner, a plurality of baffles are arranged on the sieve plates and are arranged at intervals along the water flow direction, and the cooling device is arranged on the tower body. The two ends or the middle of each baffle are provided with water flow notches, and the notches of the adjacent baffles are staggered. A cavity is arranged in the baffle, a channel communicated with the cavity is arranged in the sieve plate corresponding to the baffle, and the channel is communicated with the cooling device. The absorption tower is good in reaction effect, heat generated by reaction can be rapidly taken out of the tower body through cooling liquid in the baffles, and the NOx absorption efficiency of the absorption tower is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nitric acid production, in particular to an absorption tower used for nitric acid production. Background Art

[0002] Nitric acid is a highly oxidizing and corrosive inorganic acid, mainly used in the manufacture of fertilizers, explosives, nitrates, etc. The ammonia oxidation method is the main way to produce nitric acid in industrial production. The process is to use ammonia and air to undergo an oxidation reaction to produce NOx, and then use water to absorb NOx in an absorption tower. The NO2 in it reacts chemically with water to produce nitric acid.

[0003] At present, sieve plate absorption towers are commonly used in nitric acid production. The advantages of sieve plate absorption towers are simple structure, large production capacity, high plate efficiency and small pressure drop. Since a large amount of heat is generated during nitric acid production, this heat needs to be removed from the equipment in time to improve the efficiency of the absorption tower in absorbing NOx. However, existing absorption towers are usually equipped with serpentine cooling pipes, which are arranged on the sieve plate, affecting the contact effect between NOx and water, and further affecting the effect of absorbing NOx. Some improvements are needed. Utility Model Content

[0004] The utility model aims to provide an absorption tower for nitric acid production to solve the problems existing in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an absorption tower for nitric acid production, comprising a tower body and a cooling device, wherein a plurality of sieve plates are arranged above and below the tower body, downcomers are arranged alternately on the upper and lower adjacent sieve plates, a plurality of baffles are arranged on the sieve plates, the baffles are arranged at intervals along the water flow direction, notches for water flow are arranged at both ends or in the middle of the baffles, and the notches of adjacent baffles are arranged alternately; a cavity is arranged inside the baffle, a channel connected to the cavity is arranged in the sieve plate corresponding to the baffle, and the channel is connected to the cooling device.

[0006] As a preferred embodiment of the present technical solution, the cooling device includes a coolant storage tank, a delivery pump, a water inlet pipe and a water outlet pipe. A cooling cavity is provided in the side wall of the tower body, the channel on the sieve plate is connected to the cooling cavity, the coolant storage tank, the delivery pump, the water inlet pipe and the cooling cavity are connected in sequence, and the cooling cavity, the water outlet pipe and the coolant storage tank are connected in sequence.

[0007] As a preferred embodiment of the present technical solution, a feed pipe is arranged on the upper part of the tower body. The feed pipe is located above the uppermost sieve plate and on the side wall of the tower body opposite to the downcomer of the uppermost sieve plate. The feed pipe extends into the tower body and bends downward, and the baffle close to the feed pipe has a structure with notches at both ends.

[0008] As a preferred embodiment of the present technical solution, the water inlet pipe and the water outlet pipe are respectively arranged on opposite side walls of the tower body, and the water inlet pipe is located below the water outlet pipe.

[0009] As a preferred embodiment of the present technical solution, the sieve hole diameter of the sieve plate is 5-8 mm.

[0010] As a preferred embodiment of the present technical solution, the number of the sieve plates is 30.

[0011] Compared with the prior art, the utility model arranges a baffle on the sieve plate, the baffle is staggered with notches, a cavity is arranged inside the baffle, the cavity is connected with the channel in the sieve plate, the channel is connected with the cooling device, the flow time of the reacting water on the sieve plate is increased, the reaction effect with the gas is good, the heat generated by the reaction can be quickly brought out of the tower body through the coolant inside the baffle, and the efficiency of the absorption tower in absorbing NOx is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the appearance structure of the utility model.

[0013] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0014] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of A in .

[0015] Figure 4 It is a structural schematic diagram of the screen plate of the utility model.

[0016] In the figure: 1. tower body; 2. sieve plate; 2.1. sieve hole; 2.2. channel; 3. baffle; 4. downcomer; 5. feed pipe; 6. air outlet pipe; 7. discharge pipe; 8. air inlet pipe; 9. water outlet pipe; 10. water inlet pipe. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-4The utility model is an absorption tower for nitric acid production, comprising a tower body 1 and a cooling device. The upper end of the tower body 1 is an air outlet pipe 6, the lower end is a material discharge pipe 7, and one side of the lower end is provided with an air inlet pipe 8. A plurality of sieve plates 2 are arranged in the tower body 1, and downcomers 4 are arranged alternately on the upper and lower adjacent sieve plates 2, that is, the downcomer 4 of the upper sieve plate 2 is at the left end in the drawing, and the downcomer 4 of the next sieve plate 2 is at the right end in the drawing. The structure is the prior art. The sieve plate 2 is provided with a plurality of baffles 3, and the plurality of baffles 4 are arranged on the sieve plate 2. 3 are arranged at intervals along the water flow direction, that is, from one end of the sieve plate 2 to the end with the downcomer 4, and gaps for water flow are set at both ends or in the middle of the baffle plate 3. The gaps of adjacent baffle plates 3 are arranged in a staggered manner, that is, according to the water flow direction, when the gaps are set at both ends of the previous baffle plate 3, the gap is set in the middle of the next baffle plate 3, which can make the water flow to the downcomer in a curved manner, increasing the time the water stays on the sieve plate 2. The gaps at both ends are formed when the baffle plate 3 is not connected to the tower body 1, and the gap in the middle is formed when the baffle plate 3 is disconnected in the middle. A cavity is provided inside the baffle plate 3, and a channel 2.2 connected to the cavity is provided in the sieve plate 2 corresponding to the baffle plate 3, and the channel 2.2 is connected to the cooling device.

[0019] When the utility model is implemented, the baffle 3 is connected to the sieve plate 2, and the sieve plate 2 between the baffles 3 is provided with a sieve hole 2.1, which is arranged at the connection between the sieve plate 2 and the baffle 3, that is, the baffle 3 is buckled on the channel 2.2 of the sieve plate 2, and the channel 2.2 on the sieve plate 2 is connected to the edge end of the sieve plate 2 and is connected to the cooling device. The cooling device includes a coolant storage box, a delivery pump, a water inlet pipe 10 and a water outlet pipe 9, and the coolant storage box and the delivery pump are not drawn in the attached drawings. A cooling cavity is provided in the side wall of the tower body 1, and the channel 2.2 extending from the sieve plate 2 to the edge end of the sieve plate 2 is connected to the cooling cavity, and the coolant storage box, the delivery pump, the water inlet pipe 10 and the cooling cavity are connected in sequence, and the cooling cavity, the water outlet pipe 9 and the coolant storage box are connected in sequence.

[0020] A feed pipe 5 is arranged on the upper part of the tower body of the utility model, and the feed pipe 5 is located above the uppermost sieve plate 2. The feed pipe 5 is arranged on the side wall of the tower body 1 opposite to the downcomer 4 of the uppermost sieve plate 2. The feed pipe 5 extends into the tower body 1 and bends downward, and the baffle 3 close to the feed pipe 5 is a structure with notches at both ends.

[0021] During the specific implementation of the present invention, the water inlet pipe 10 and the water outlet pipe 9 are respectively arranged on the opposite side walls of the tower body 1, the water inlet pipe 10 is located below the water outlet pipe 9, the sieve holes 2.1 of the sieve plate 2 have a diameter of 5-8 mm, and the sieve plate 2 has 30 holes.

[0022] When the utility model is working, the gas enters the tower body through the air inlet pipe on one side of the bottom of the tower body and moves upward, and the water for absorption enters the tower body from the feed pipe and moves downward through the sieve plate in sequence, and the two meet and react with each other in the tower body, and the generated heat is taken out of the tower body through the coolant in the baffle. The utility model can improve the efficiency of the absorption tower in absorbing NOx.

[0023] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An absorption tower for nitric acid production, characterized in that: It includes a tower body and a cooling device. A plurality of sieve plates are arranged above and below the tower body. Downcomers are arranged alternately on the upper and lower adjacent sieve plates. A plurality of baffles are arranged on the sieve plates. The baffles are arranged at intervals along the water flow direction. Notches for water flow are arranged at both ends or in the middle of the baffles. The notches of adjacent baffles are arranged alternately. A cavity is arranged inside the baffle. A channel connected to the cavity is arranged in the sieve plate corresponding to the baffle. The channel is connected to the cooling device.

2. The absorption tower for nitric acid production according to claim 1, characterized in that: The cooling device includes a coolant storage box, a delivery pump, a water inlet pipe and a water outlet pipe. A cooling cavity is provided in the side wall of the tower body. The channel on the sieve plate is connected to the cooling cavity. The coolant storage box, the delivery pump, the water inlet pipe and the cooling cavity are connected in sequence. The cooling cavity, the water outlet pipe and the coolant storage box are connected in sequence.

3. The absorption tower for nitric acid production according to claim 2, characterized in that: A feed pipe is arranged on the upper part of the tower body, which is located above the uppermost sieve plate and on the side wall of the tower body opposite to the downcomer of the uppermost sieve plate. The feed pipe extends into the tower body and bends downward, and the baffle plate close to the feed pipe is a structure with notches at both ends.

4. The absorption tower for nitric acid production according to claim 2, characterized in that: The water inlet pipe and the water outlet pipe are respectively arranged on opposite side walls of the tower body, and the water inlet pipe is located below the water outlet pipe.

5. The absorption tower for nitric acid production according to claim 1, characterized in that: The sieve hole diameter of the sieve plate is 5-8 mm.

6. The absorption tower for nitric acid production according to claim 1, characterized in that: There are 30 sieve plates.

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