Low-pressure decomposition and recovery device for urea

Abstract

The utility model discloses a urea low-pressure decomposition and recovery device which comprises a stripping tower, a material homogenizing assembly and a soaking assembly, the stripping tower comprises a tower plate and an overflow weir which are arranged in the stripping tower, a liquid inlet pipe and a steam pipe which are respectively arranged at the upper end and the lower end of one side, a liquid outlet pipe arranged at one side of the lower part, a recovery pipe arranged at the top and manholes arranged at the front end. According to the urea low-pressure decomposition and recovery device disclosed by the utility model, raw materials conveyed in the liquid inlet pipe on the outer side of the stripping tower are conveyed to the inclined baffle block on the outer side of the baffle plate on the tower plate, so that after the raw materials pass through the material uniformizing opening between the inclined baffle block and the baffle plate, the downward flowing speed of the raw materials is ensured to be uniform; the raw materials are uniformly conveyed to the upper end of the tower plate through the liquid outlet holes in the bottom of the baffle plate, flow at the upper end of the inclined tower plate, penetrate through the circulating port and are uniformly conveyed to the upper end of the inclined baffle block on the lower tower plate along the uniform dividing strips in the overflow weir, and then are uniformly conveyed again, so that the uniformity of the conveyed raw materials flowing at the upper end of the tower plate is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of stripping towers, in particular to a urea low-pressure decomposition and recovery device. Background Art

[0002] The urea low-pressure decomposition and recovery device refers to a hydrolysis stripping tower, which is used to carry out the low-pressure decomposition process of urea, recover the gas and liquid produced in the low-pressure decomposition stage during the urea production process, reduce waste, and reduce the energy consumption of urea production and improve energy efficiency through technical means such as heat recovery. At the same time, it reduces the emission of pollutants such as wastewater and waste gas to achieve clean production.

[0003] In the existing hydrolysis stripping tower, the upper end of the tower plate is in the middle of the raw material transportation, which makes it difficult to simultaneously ensure the uniform distribution of the raw material on the upper end of the tower plate during the circulation transportation and the uniform transportation of the raw material to the tower plate during the steam transportation. Therefore, we propose a urea low-pressure decomposition and recovery device. Utility Model Content

[0004] The utility model aims to solve one of the technical problems existing in the prior art or related technology.

[0005] To this end, the technical solution adopted in this utility model is:

[0006] A urea low-pressure decomposition and recovery device comprises: a stripping tower, a material distribution component, and a heat distribution component; the stripping tower comprises a tower plate and an overflow weir arranged inside the stripping tower, a liquid inlet pipe and a steam pipe respectively installed at the upper and lower ends of one side, a liquid outlet pipe installed at one side of the lower part, a recovery pipe installed at the top, and a manhole arranged and installed at the front end; the material distribution component comprises a protective frame fixedly installed at the upper end of the tower plate, a baffle fixedly installed at one side of the protective frame, a plurality of groups of liquid outlet holes arranged and opened at the lower part of the baffle, a circulation port penetratingly opened at one side of the tower plate, and a plurality of groups of equalizing strips arranged and installed at one side of the overflow weir; the heat distribution component comprises a plurality of groups of steam inlet holes arranged and opened in the tower plate in the protective frame, cone covers movably installed at the tops of the steam inlet holes, and a plurality of groups of guide strips arranged and installed in the cone covers.

[0007] Preferably, an oblique stopper is fixedly installed in the protective frame outside the baffle.

[0008] Preferably, a material mixing port is formed between the baffle and the inclined block.

[0009] Preferably, a convex ring is fixedly installed on the top tower plate of the steam inlet hole.

[0010] Preferably, a connecting rod is fixedly installed between one side of the bottom of the cone cover and the convex ring.

[0011] Preferably, the tower plate is installed obliquely in the stripping tower.

[0012] By adopting the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0013] 1. In the utility model, the raw material transported in the liquid inlet pipe outside the stripping tower will be transported to the inclined block outside the baffle on the tower plate, so that after passing through the material leveling port between the inclined block and the baffle to ensure the uniform downflow speed of the raw material, the raw material will be uniformly transported to the upper end of the tower plate through the liquid outlet hole at the bottom of the baffle, and after flowing at the upper end of the inclined tower plate, it will pass through the circulation port and along the equalizing strip in the overflow weir, and evenly transported to the upper end of the inclined block on the lower tower plate, and then transported again evenly, so as to ensure the uniformity of the transported raw material in the flow at the upper end of the tower plate;

[0014] 2. In the utility model, the cone cover installed at the upper end of the steam inlet hole on the tower plate can guide and evenly distribute the steam outflow through multiple groups of guide strips in the cone cover when the steam passes through the steam inlet hole, so as to evenly transport the raw materials to the upper end of the outer end of the convex ring, thereby improving the decomposition effect of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall structure diagram of the utility model;

[0016] Figure 2 This is a disassembled diagram of the utility model;

[0017] Figure 3 It is the structural diagram of the tower plate of the utility model;

[0018] Figure 4 It is a top view of the tower plate of the utility model;

[0019] Figure 5 This is a structural diagram of the overflow weir of the utility model;

[0020] Figure 6 It is a partial side sectional view of the cone cover of the utility model.

[0021] Reference numerals:

[0022] 100, stripping tower; 101, tower plate; 102, overflow weir; 103, liquid inlet pipe; 104, steam pipe; 105, liquid outlet pipe; 106, recovery pipe; 107, manhole;

[0023] 200, material equalization component; 201, protection frame; 202, baffle; 203, liquid outlet; 204, circulation port; 205, equalization strip; 206, oblique stopper; 207, material equalization port;

[0024] 300, heat-saturating assembly; 301, steam inlet hole; 302, cone cover; 303, guide strip; 304, convex ring; 305, connecting rod. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0026] A urea low-pressure decomposition and recovery device provided by some embodiments of the utility model will be described below in conjunction with the accompanying drawings.

[0027] Embodiment 1:

[0028] Combination Figure 1-6 As shown, the utility model provides a urea low-pressure decomposition and recovery device, comprising: a stripping tower 100, a material equalizing assembly 200, and a heat equalizing assembly 300; the stripping tower 100 comprises a tower plate 101 and an overflow weir 102 arranged inside it, a liquid inlet pipe 103 and a steam pipe 104 respectively installed at the upper and lower ends of one side, a liquid outlet pipe 105 installed at one side of the lower part, a recovery pipe 106 installed at the top, and a manhole 107 arranged and installed at the front end; the tower plate 101 is installed obliquely in the stripping tower 100, and the material equalizing assembly 200 is installed at the top of the stripping tower 100. The component 200 includes a protective frame 201 fixedly installed on the upper end of the tower plate 101, a baffle 202 fixedly installed on one side of the protective frame 201, a plurality of liquid outlet holes 203 arranged at the lower part of the baffle 202, a circulation port 204 penetrating through one side of the tower plate 101, and a plurality of equal distribution strips 205 arranged and fixedly installed on one side of the overflow weir 102; an inclined block 206 is also fixedly installed in the protective frame 201 outside the baffle 202, and a material mixing port 207 is formed between the baffle 202 and the inclined block 206.

[0029] Specifically, the urea low-pressure decomposition and recovery device refers to a hydrolysis stripping tower, which is used to carry out the low-pressure decomposition process of urea and recover the gas and liquid generated in the low-pressure decomposition stage during the urea production process; the raw materials transported in the liquid inlet pipe 103 on the outside of the stripping tower 100 will be transported to the inclined block 206 on the outside of the baffle 202 on the tower plate 101, so as to ensure that the raw material downstream speed is uniform after passing through the material leveling port 207 between the inclined block 206 and the baffle 202, and then the raw materials will be uniformly transported to the upper end of the tower plate 101 through the multiple groups of liquid outlet holes 203 at the bottom of the baffle 202, and after flowing at the upper end of the inclined tower plate 101, they will pass through the circulation port 204 and along the equalizing strip 205 in the overflow weir 102, and be uniformly transported to the upper end of the inclined block 206 on the lower tower plate 101, and then be uniformly transported again, thereby ensuring the uniformity of the transported raw materials in the flow at the upper end of the tower plate 101.

[0030] Embodiment 2:

[0031] Combination Figure 6As shown, on the basis of Example 1, the heat equalizing component 300 includes a plurality of steam inlet holes 301 arranged in the tower plate 101 in the protective frame 201, cone covers 302 movably installed on the top of the steam inlet holes 301, and a plurality of guide strips 303 arranged in the cone covers 302. A convex ring 304 is also fixedly installed on the tower plate 101 at the top of the steam inlet holes 301, and a connecting rod 305 is also fixedly installed between the bottom side of the cone cover 302 and the convex ring 304.

[0032] Specifically, the cone cover 302 installed on the upper end of the steam inlet hole 301 on the tower plate 101 can guide and evenly distribute the steam outflow route through multiple groups of guide strips 303 in the cone cover 302 when the steam passes through the steam inlet hole 301, so as to evenly transport the raw materials to the upper end of the outer end of the convex ring 304, so as to improve the decomposition effect of the raw materials. The convex ring 304 fixedly installed on the upper part of the steam inlet hole 301 is mainly used to prevent the raw materials from flowing down through the steam inlet hole 301. The connecting rod 305 connected between the cone cover 302 and the convex ring 304 is mainly used to ensure that the cone cover 302 is firmly installed.

[0033] The working principle and use process of this utility model:

[0034] When the raw material is transported through the liquid inlet pipe 103, it will be transported to the upper end of the inclined block 206 on the tower plate 101. After the raw material is transported to the upper end of the inclined block 206, it will be evenly transported to the material mixing port 207 under the obstruction of the inclined block 206, and will flow evenly to the upper end of the tower plate 101 along the multiple groups of liquid outlet holes 203 on the bottom side of the material mixing port 207, so as to be evenly transported on the lower tower plate 101 again along the circulation port 204 on one side of the tower plate 101 and the equalizing strip 205 in the overflow weir 102. When the raw material is evenly transported to the upper end of the tower plate 101, the steam introduced into the steam pipe 104 will enter along the steam inlet hole 301 in the tower plate 101, and after entering, it will be evenly transported to the outside of the raw material at the outer end of the convex ring 304 after being blocked by the cone cover 302 on the top of the steam inlet hole 301 and guided by the guide strip 303, so as to be evenly decomposed in the raw material.

[0035] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A urea low-pressure decomposition and recovery device, characterized in that: include: A stripping tower (100), a material equalizing component (200), and a heat equalizing component (300); The stripping tower (100) includes a tower plate (101) and an overflow weir (102) arranged inside the tower, a liquid inlet pipe (103) and a steam pipe (104) respectively installed at the upper and lower ends of one side, a liquid outlet pipe (105) installed at one side of the lower part, a recovery pipe (106) installed at the top, and a manhole (107) arranged and installed at the front end; The material distribution assembly (200) comprises a protection frame (201) fixedly mounted on the upper end of a tower plate (101), a baffle (202) fixedly mounted on one side of the protection frame (201), a plurality of groups of liquid outlet holes (203) arranged and opened at the lower part of the baffle (202), a circulation port (204) penetratingly opened on one side of the tower plate (101), and a plurality of groups of distribution strips (205) arranged and fixedly mounted on one side of the overflow weir (102); The heat-saturating assembly (300) comprises a plurality of steam inlet holes (301) arranged and opened in a tower plate (101) in a protective frame (201), cone covers (302) movably installed on the tops of the steam inlet holes (301), and a plurality of guide strips (303) arranged and installed in the cone covers (302).

2. A urea low-pressure decomposition and recovery device according to claim 1, characterized in that: An oblique stopper (206) is also fixedly installed in the protective frame (201) outside the baffle (202).

3. A urea low-pressure decomposition and recovery device according to claim 1, characterized in that: A material mixing port (207) is also formed between the baffle plate (202) and the inclined baffle block (206).

4. A urea low-pressure decomposition and recovery device according to claim 1, characterized in that: A convex ring (304) is also fixedly mounted on the top tower plate (101) of the steam inlet hole (301).

5. The urea low-pressure decomposition and recovery device according to claim 1, characterized in that: A connecting rod (305) is also fixedly installed between one side of the bottom of the cone cover (302) and the convex ring (304).

6. The urea low-pressure decomposition and recovery device according to claim 1, characterized in that: The tower plate (101) is installed in an inclined manner in the stripping tower (100).

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