CN220126183U

CN220126183U - Urea hydrolysis reactor

Info

Publication number: CN220126183U
Application number: CN202321249618.2U
Authority: CN
Inventors: 李春启; 封冠军; 王晓鹏; 丰帅; 闫军; 牛肖锋; 侯立刚; 姬星照; 马超; 樊宁宁
Original assignee: Hebei Zhengyuan Hydrogen Energy Technology Co Ltd
Current assignee: Hebei Zhengyuan Hydrogen Energy Technology Co Ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2023-12-05
Anticipated expiration: 2033-05-22

Abstract

The utility model provides a urea hydrolysis reactor which comprises a shell, a heat exchange tube bundle, a heat exchange box and a liquid inlet tube. According to the urea hydrolysis reactor provided by the utility model, through the arrangement of the heat exchange box, urea solution flows through the heat exchange box before flowing into the shell, mixed flow is formed through the baffle plates in the heat exchange box, and the air return pipes are arranged between two adjacent baffle plates, so that the urea solution can be fully preheated after the mixed flow is completed, and the heating efficiency of the urea solution is accelerated. After the urea solution is preheated in the heat exchange box, the urea solution flows into the shell and is further heated through the air inlet pipe. According to the utility model, the baffle plate is added in the heat exchange box, so that the heating efficiency of urea solution is improved, and the overall production efficiency of the urea hydrolysis reactor is further effectively improved.

Description

Urea hydrolysis reactor

Technical Field

The utility model belongs to the technical field of urea production equipment, and particularly relates to a urea hydrolysis reactor.

Background

The ammonia production by the urea hydrolysis reactor is a common technology in the preparation process of the flue gas denitration reducing agent, and key equipment used in the process is the urea hydrolysis reactor in the application process. The urea hydrolysis reactor adopts a high-temperature steam pipeline in the urea hydrolysis reactor to heat urea solution and then carry out hydrolysis reaction to generate ammonia-containing product gas in the application process. Therefore, the heat exchange efficiency of the urea solution and the steam pipeline directly determines the working efficiency of the urea hydrolysis reactor after the urea solution is added into the reactor.

The conventional urea hydrolysis reactor is simply provided with a U-shaped steam pipe inside the shell, and then urea solution is transferred to the inside of the shell for reaction. Resulting in a reaction by heating the liquid solution in the vicinity of the vapor line, while the liquid away from the vapor line is less likely to heat up. Thereby affecting the overall reaction efficiency of the urea solution.

Disclosure of Invention

The embodiment of the utility model provides a urea hydrolysis reactor, which aims to solve the problem of low production efficiency of the urea hydrolysis reactor in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme: there is provided a urea hydrolysis reactor comprising:

a housing;

the heat exchange tube bundle comprises an air inlet tube, an air return tube and a connecting tube for communicating the air inlet tube and the air return tube;

the heat exchange box is fixedly arranged in the shell, the air return pipe penetrates through the heat exchange box, a plurality of baffle plates are arranged in the heat exchange box from top to bottom, two adjacent baffle plates along the vertical direction are respectively positioned on the inner walls of the heat exchange box opposite to the two sides, the air return pipe is arranged between the two adjacent baffle plates, and the bottom of the heat exchange box is provided with a liquid outlet pipe communicated with the heat exchange box;

and the liquid inlet pipe is communicated with the top surface of the heat exchange box and is used for conveying urea solution into the heat exchange box.

In one possible implementation manner, the number of the heat exchange boxes is multiple, the multiple heat exchange boxes are sequentially arranged along the length direction of the muffler, and the liquid inlet pipes are respectively communicated with the multiple heat exchange boxes.

In one possible implementation manner, the liquid outlet pipe is located below the air inlet pipe, and a plurality of liquid outlets are arranged on the liquid outlet pipe, and the liquid outlets are arranged towards the air inlet pipe.

In one possible implementation manner, the heat dissipation wing plates are fixedly arranged on two sides of the air inlet pipe.

In one possible implementation manner, the heat dissipation wing plates on two adjacent air inlet pipes along the vertical direction are arranged in a staggered manner along the length direction of the air inlet pipes.

In one possible implementation, an aeration pipe for conveying compressed air is also arranged on the outer side of the air inlet pipe in a fitting manner.

In one possible implementation manner, an arc plate is connected to the outer side of the air inlet pipe in a sealing manner, and the arc plate and the outer side wall of the air inlet pipe form the aerator pipe.

In one possible implementation manner, an air outlet hole is arranged on the side wall of the aeration pipe, and the air outlet hole is positioned on one side of the aeration pipe away from the air return pipe.

In one possible implementation, the heat exchange box is supported and fixed inside the shell, and the heat exchange box is in sealing connection with the muffler.

Compared with the prior art, the scheme disclosed by the embodiment of the utility model has the advantages that the shell is arranged, the top of the shell is provided with the air outlet for outputting the reacted gas, the side surface of the shell is provided with the liquid level meter, and the bottom of the shell is provided with the sewage outlet. According to the utility model, the plurality of groups of heat exchange tube bundles are arranged in the shell, the plurality of groups of heat exchange tube bundles are arranged at intervals along the vertical direction, and the whole heat exchange tube bundle is of a U-shaped structure. The steam sequentially flows through the air inlet pipe, the connecting pipe and the air return pipe to heat the urea solution in the shell. According to the utility model, through the arrangement of the heat exchange box, the urea solution flows through the heat exchange box before flowing into the shell, mixed flow is formed through the baffle plates in the heat exchange box, and the air return pipes are arranged between the two adjacent baffle plates, so that the urea solution can be fully preheated after the mixed flow is completed, and the heating efficiency of the urea solution is accelerated. After the urea solution is preheated in the heat exchange box, the urea solution flows into the shell and is further heated through the air inlet pipe. According to the utility model, the baffle plate is added in the heat exchange box, so that the heating efficiency of urea solution is improved, and the overall production efficiency of the urea hydrolysis reactor is further effectively improved.

Drawings

FIG. 1 is a schematic diagram of a urea hydrolysis reactor according to an embodiment of the present utility model;

FIG. 2 is a side cross-sectional view of a heat exchange box provided by an embodiment of the present utility model;

fig. 3 is a schematic layout diagram of a heat dissipation wing plate according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a heat exchange tube bundle according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a housing; 2. a heat exchange tube bundle; 21. an air inlet pipe; 211. a heat dissipation wing plate; 212. an aeration pipe; 22. an air return pipe; 3. a heat exchange box; 31. a baffle plate; 32. a liquid inlet pipe; 33. and a liquid outlet pipe.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1, 2 and 4 together, a urea hydrolysis reactor according to the present utility model will now be described. The urea hydrolysis reactor comprises a shell 1, a heat exchange tube bundle 2, a heat exchange box 3 and a liquid inlet tube 32. The heat exchange tube bundle 2 comprises an air inlet tube 21, an air return tube 22 and a connecting tube for communicating the air inlet tube 21 and the air return tube 22; the heat exchange box 3 is fixedly arranged in the shell 1, the air return pipe 22 penetrates through the heat exchange box 3, a plurality of baffle plates 31 are arranged in the heat exchange box 3 from top to bottom, two adjacent baffle plates 31 along the vertical direction are respectively positioned on the inner walls opposite to the two sides of the heat exchange box 3, the air return pipe 22 is arranged between the two adjacent baffle plates 31, and the bottom of the heat exchange box 3 is provided with a liquid outlet pipe 33 communicated with the heat exchange box 3; the liquid inlet pipe 32 is communicated with the top surface of the heat exchange box 3 and is used for conveying urea solution into the heat exchange box 3.

Compared with the prior art, the urea hydrolysis reactor provided by the embodiment is provided with the casing 1, the top of the casing 1 is provided with the gas outlet for outputting the reacted gas, the side face is provided with the liquid level meter, and the bottom of the casing 1 is provided with the drain. According to the utility model, the plurality of groups of heat exchange tube bundles 2 are arranged in the shell 1, the plurality of groups of heat exchange tube bundles 2 are arranged at intervals along the vertical direction, and the whole heat exchange tube bundle 2 is of a U-shaped structure. The steam flows through the air inlet pipe 21, the connecting pipe and the air return pipe 22 in order to heat the urea solution inside the housing 1. According to the utility model, through the arrangement of the heat exchange box 3, the urea solution flows through the heat exchange box 3 before flowing into the shell 1, mixed flow is formed through the baffle plates 31 in the heat exchange box 3, and the air return pipes 22 are arranged between two adjacent baffle plates 31, so that the urea solution can be fully preheated after the mixed flow is completed, and the heating efficiency of the urea solution is accelerated. After the urea solution is preheated in the heat exchange box 3, the urea solution flows into the shell 1 and is further heated by the air inlet pipe 21. According to the utility model, the baffle plate 31 is added in the heat exchange box 3, so that the heating efficiency of urea solution is improved, and the overall production efficiency of the urea hydrolysis reactor is further effectively improved.

Specifically, in the present embodiment, the length direction of the shell 1 is set in the horizontal direction, and the heat exchange tube bundle 2 is located at the bottom of the shell 1 and is set along with the length direction of the shell 1. The connecting pipe is U-shaped structure, and the both ends of connecting pipe are linked together with intake pipe 21 and muffler 22 respectively and set up.

Preferably, in the present embodiment, the plurality of groups of heat exchange tube bundles 2 are arranged at intervals in the vertical direction, and the muffler pipes 22 are arranged at intervals in the vertical direction in order inside the heat exchange box 3.

In some embodiments, the heat exchange box 3 may have a structure as shown in fig. 2. Referring to fig. 2, the number of the heat exchange boxes 3 is plural, the plural heat exchange boxes 3 are sequentially arranged along the length direction of the return air pipe 22, and the liquid inlet pipe 32 is respectively provided in communication with the plural heat exchange boxes 3. The liquid inlet of the liquid inlet pipe 32 is positioned at the outer side of the shell 1, and a liquid dividing pipe is communicated at the outlet of the liquid inlet pipe 32, and the length direction of the liquid dividing pipe is arranged along the arrangement direction of the plurality of heat exchange boxes 3. And a plurality of heat exchange boxes 3 are respectively communicated with the liquid distribution pipe uniformly. The plurality of heat exchange tanks 3 are provided so that the urea solution introduced into the liquid inlet pipe 32 can be dispersed into the plurality of heat exchange tanks 3 in the longitudinal direction of the muffler 22. So that the urea solution can absorb heat fully and heat up quickly.

In some embodiments, the liquid outlet pipe 33 may have a structure as shown in fig. 2. Referring to fig. 2, the liquid outlet pipe 33 is located below the air inlet pipe 21, and a plurality of liquid outlets are arranged on the liquid outlet pipe 33, and the liquid outlets are disposed toward the air inlet pipe 21. The liquid outlet pipe 33 is directly below the air inlet pipe 21, and the liquid outlet pipe 33 is disposed in parallel with the air inlet pipe 21. And a plurality of liquid outlet holes are arranged on the top surface of the liquid outlet pipe 33, the liquid outlet holes are oblong holes, and the length direction of the liquid outlet holes is arranged along the length direction of the liquid outlet pipe 33. The urea solution flows out from the liquid outlet pipe 33 and then directly flows to the air inlet pipe 21, and is further heated by the air inlet pipe 21 to undergo hydrolysis reaction. The liquid outlet pipe 33 is positioned below the air inlet pipe 21, so that the urea solution can flow out of the liquid outlet pipe 33 and then directly flow to the air inlet pipe 21, and the urea solution can be quickly heated for hydrolysis reaction.

In some embodiments, the air inlet pipe 21 may have a structure as shown in fig. 2 and 3. Referring to fig. 2 and 3, the heat radiation fins 211 are fixedly installed on both sides of the intake pipe 21. The heat dissipation wing plates 211 are fixedly arranged on two sides of the air inlet pipe 21 through welding, and the cross sections of the heat dissipation wing plates 211 are of wave-shaped structures. The size of the heat dissipation wing plate 211 can be increased in a limited space, so that the heat exchange efficiency of the air inlet pipe 21 and urea solution is effectively improved.

Preferably, in the present embodiment, the heat radiation fin 211 is provided to extend to the outside of the intake pipe 21 in the horizontal direction. The urea solution flows into the heat radiation fin 211 after flowing through the intake pipe 21, and undergoes a hydrolysis reaction by sufficiently absorbing heat in the heat radiation fin 211. Effectively improves the reaction efficiency of urea solution.

In some embodiments, the intake pipe 21 may have a structure as shown in fig. 3. Referring to fig. 3, the heat radiation fins 211 on two intake pipes 21 adjacent in the vertical direction are offset from each other in the length direction of the intake pipe 21. A plurality of heat dissipation wing plates 211 are arranged on each air inlet pipe 21, the heat dissipation wing plates 211 are arranged at intervals along the length direction of the air inlet pipe 21, the heat dissipation wing plates 211 of two adjacent air inlet pipes 21 are arranged in a staggered mode, urea solution can flow upwards, and after passing through the lower heat dissipation wing plates 211, the urea solution flows onto the upper heat dissipation wing plates 211. The urea solution can fully contact the heat dissipation wing plates 211 to fully absorb heat, so that the reaction efficiency of the urea solution is improved.

In some embodiments, the air inlet pipe 21 may have a structure as shown in fig. 2 and 3. Referring to fig. 2 and 3, an aeration pipe 212 for delivering compressed air is attached to the outside of the air inlet pipe 21. The aerator pipe 212 is attached to the outside of the intake pipe 21. So that the compressed air can absorb heat of the air inlet pipe 21 after entering the inside of the aeration pipe 212. The compressed air is heated and then output from the inside of the aeration pipe 212, and flows inside the urea solution in the housing 1. The urea solution in the housing 1 can be mixed so that the urea solution absorbs heat relatively uniformly. Meanwhile, heat in the compressed air can be transferred to the urea solution, so that the urea solution can absorb heat fully to be reflected. The heat absorption of the urea solution is quickened, and the hydrolysis reaction of the urea solution is improved.

In some embodiments, the aeration tube 212 may be configured as shown in FIG. 2. Referring to fig. 2, an arc plate is connected to the outer side of the air inlet pipe 21 in a sealing manner, and the arc plate and the outer side wall of the air inlet pipe 21 form an aerator pipe 212. By welding an arc plate on the outside of the intake pipe 21, a gap between the arc plate and the outside wall of the intake pipe 21 is used for circulation of compressed air. The outer side wall of the intake pipe 21 can be made to directly transfer heat to the compressed air. The compressed air can absorb heat and raise temperature fast, so that the temperature of the output compressed air is ensured.

In some embodiments, the aeration tube 212 may be configured as shown in fig. 2 and 3. Referring to fig. 2 and 3, the sidewall of the aerator pipe 212 is provided with an air outlet, and the air outlet is located at one side of the aerator pipe 212 away from the muffler 22. The air outlets on the aeration pipes 212 face the same direction, so that when the urea solution is pushed by the compressed air, a corresponding flowing state is formed in the shell 1 according to the air outlet direction of the aeration pipes 212. The urea solution in the shell 1 can be heated uniformly, so that the hydrolysis efficiency of the urea solution is improved.

In some embodiments, the heat exchange box 3 may have a structure as shown in fig. 1 and 4. Referring to fig. 1 and 4, the heat exchange box 3 is supported and fixed inside the casing 1, and the heat exchange box 3 is connected with the muffler 22 in a sealing manner. The side wall of the heat exchange box 3 is connected with the outer side wall of the muffler 22 in a sealing way. And the bottom of the heat exchange box 3 is provided with a support column for supporting and fixing the heat exchange box 3 on the inner wall of the shell 1. The heat exchange tank 3 is hermetically connected to the muffler 22, so that the urea solution can flow out only through the outflow pipe 33 of the heat exchange tank 3. The urea solution can flow through the air inlet pipe 21 to fully absorb heat for hydrolysis reaction, so that the production efficiency is improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. A urea hydrolysis reactor, comprising:

a housing (1);

the heat exchange tube bundle (2), the heat exchange tube bundle (2) comprises an air inlet tube (21), an air return tube (22) and a connecting tube for communicating the air inlet tube (21) with the air return tube (22);

the heat exchange box (3) is fixedly installed inside the shell (1), the air return pipe (22) penetrates through the heat exchange box (3), a plurality of baffle plates (31) are arranged inside the heat exchange box (3) from top to bottom, two adjacent baffle plates (31) are respectively located on the inner walls of the two opposite sides of the heat exchange box (3) along the vertical direction, the air return pipe (22) is arranged between the two adjacent baffle plates (31), and a liquid outlet pipe (33) communicated with the heat exchange box (3) is arranged at the bottom of the heat exchange box (3);

and the liquid inlet pipe (32) is communicated with the top surface of the heat exchange box (3) and is used for conveying urea solution into the heat exchange box (3).

2. Urea hydrolysis reactor according to claim 1, characterized in that the number of heat exchange boxes (3) is plural, the plural heat exchange boxes (3) are arranged in sequence along the length direction of the return air pipe (22), and the liquid inlet pipe (32) is respectively communicated with the plural heat exchange boxes (3).

3. Urea hydrolysis reactor according to claim 1, characterized in that the outlet pipe (33) is located below the inlet pipe (21), and in that a plurality of outlets are arranged on the outlet pipe (33), which outlets are arranged towards the inlet pipe (21).

4. Urea hydrolysis reactor according to claim 1, characterized in that the two sides of the inlet pipe (21) are fixedly equipped with heat-dissipating fins (211).

5. The urea hydrolysis reactor as claimed in claim 4, characterized in that the heat dissipation fins (211) on two vertically adjacent air inlet pipes (21) are offset from each other along the length of the air inlet pipe (21).

6. Urea hydrolysis reactor according to claim 1, characterized in that the outer side of the inlet pipe (21) is also provided with an aeration pipe (212) for conveying compressed air.

7. The urea hydrolysis reactor as claimed in claim 6, characterized in that the outer side of the air inlet pipe (21) is connected with an arc plate in a sealing manner, and the arc plate and the outer side wall of the air inlet pipe (21) form the aerator pipe (212).

8. A urea hydrolysis reactor according to claim 6, characterized in that the side wall of the aeration pipe (212) is provided with an air outlet hole, which is located at the side of the aeration pipe (212) remote from the air return pipe (22).

9. A urea hydrolysis reactor as claimed in claim 1, characterized in that the heat exchange box (3) is supported and fixed inside the housing (1), and in that the heat exchange box (3) is in sealing connection with the return air duct (22).