Waste heat recovery mechanism of tubular reactor for diammonium phosphate production

By installing a heat conduction groove and a waste heat recovery mechanism in the medium cavity outside the tubular reactor for diammonium phosphate production, the problem of reaction heat loss is solved, the effective utilization of waste heat is achieved, and the energy consumption of the granulation process is reduced.

CN223332222UActive Publication Date: 2025-09-12HUBEI YIHUA CHUXING ECOLOGICAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202422155153.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-03
Publication Date
2025-09-12
Estimated Expiration
2034-09-03

AI Technical Summary

Technical Problem

In the existing diammonium phosphate production process, the reaction heat in the tubular reactor is lost and the subsequent granulation process requires additional heat supply, resulting in energy waste.

Method used

A waste heat recovery mechanism is designed. By installing symmetrically arranged mounting plates outside the tubular reactor, a heat conduction groove and a medium cavity are formed. The medium transfers heat to the medium cavity through the medium inlet and outlet pipes for heating in the subsequent granulation process.

Benefits of technology

The waste heat generated by the neutralization reaction is effectively utilized to reduce the consumption of electric and thermal energy in the subsequent granulation process, thus saving energy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a waste heat recovery mechanism of a tubular reactor for diammonium phosphate production, which comprises mounting plates symmetrically arranged relative to the tubular reactor, the mounting plates are detachably fixed and matched through a plurality of fastening mechanisms, one side of each mounting plate close to the tubular reactor is provided with a half heat conduction groove, and the other side of each mounting plate is provided with a plurality of heat conduction grooves. The half heat conduction grooves of the two mounting plates are matched to form a complete heat conduction groove, the tubular reactor is embedded in the complete heat conduction groove, the two ends of the tubular reactor penetrate out of the heat conduction groove, the outer wall of the tubular reactor is in heat conduction fit with the heat conduction groove, and medium cavities are formed in the positions, close to the heat conduction grooves, in the mounting plates; a medium cavity is formed in the tubular reactor, the medium cavity and the heat conduction groove are in heat conduction fit, a medium feeding pipe is arranged on the side, close to the feeding end of the tubular reactor, of the medium cavity, and a medium discharging pipe is arranged on the side, close to the discharging end of the tubular reactor, of the medium cavity. And the consumption of electric power and heat energy in the granulation process is reduced.
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Description

Technical Field

[0001] The utility model relates to the technical field of diammonium phosphate production equipment, in particular to a waste heat recovery mechanism of a tubular reactor used for diammonium phosphate production. Background Art

[0002] The existing diammonium phosphate production process utilizes a tubular reactor, where a certain ratio of phosphoric acid and ammonia is neutralized within the reactor and then sprayed onto the pelletizer bed using the reactor's high pressure. This process has been optimized by using liquid ammonia instead of gaseous ammonia as a raw material, lowering the temperature and pressure of the ammonia entering the reactor and minimizing ammonia emissions.

[0003] However, during the optimized reaction process, a large amount of heat is released during the neutralization reaction. This heat is directly lost in the tubular reactor without reasonable recovery. In addition, heat supply is also required in the subsequent granulation process, consuming a large amount of electrical heat energy. Utility Model Content

[0004] The utility model provides a waste heat recovery mechanism for a tubular reactor used in diammonium phosphate production, aiming to solve the problems of reaction heat loss in the tubular reactor and the need for heat supply for subsequent granulation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A waste heat recovery mechanism for a tubular reactor used in diammonium phosphate production includes mounting plates symmetrically arranged about the tubular reactor, and the mounting plates are detachably fixedly fitted by a number of fastening mechanisms. The mounting plates are each provided with a half heat conduction groove on one side close to the tubular reactor, and the half heat conduction grooves of the two mounting plates cooperate to form a complete heat conduction groove. The tubular reactor is embedded in the complete heat conduction groove, and both ends of the tubular reactor extend out of the heat conduction groove. The outer wall of the tubular reactor forms a heat conduction fit with the heat conduction groove. A medium cavity is provided in the mounting plate close to the heat conduction groove, and the medium cavity forms a heat conduction fit with the heat conduction groove. A medium feed pipe is provided on the side of the medium cavity close to the feed end of the tubular reactor, and a medium discharge pipe is provided on the side of the medium cavity close to the discharge end of the tubular reactor.

[0007] Preferably, the heat conduction groove is matched with the tubular reactor, the medium cavity is parallel to the heat conduction groove, and the arrangement shape of the medium cavity is the same as the arrangement shape of the heat conduction groove.

[0008] As a more preferred embodiment, the two ends of the medium cavity pass through the mounting plate, and a medium feed pipe is sealed and fixedly fitted at a penetration position of the medium cavity on the side close to the feed end of the tubular reactor, and a medium discharge pipe is sealed and fixedly fitted at a penetration position of the medium cavity on the side close to the discharge end of the tubular reactor, and the two ends of the medium cavity are connected to the outside world through the medium feed pipe and the medium discharge pipe respectively.

[0009] Furthermore, the medium cavity is sealedly connected to the external medium supply mechanism through a medium feed pipe, and the medium cavity is sealedly connected to the granulation mechanism through a medium discharge pipe.

[0010] Furthermore, a plurality of fastening mechanisms are evenly spaced apart on the top and bottom of the mounting plate on the side close to the tubular reactor, and the fastening mechanisms of the two mounting plates correspond one to one.

[0011] In detail, the number of the fastening mechanisms located on the same side is no less than three.

[0012] In more detail, the fastening mechanism includes a fastening block provided on the side of the mounting plate close to the tubular reactor. The fastening blocks of the two mounting plates correspond to each other one by one, and the corresponding fastening blocks are fixedly fitted by fastening bolts.

[0013] Preferably, mounting mechanisms are detachably provided on the four corners of the mounting plate on one side, and the mounting plate forms a detachable fixed fit with the factory building mounting column through the mounting mechanism.

[0014] More preferably, the mounting mechanism includes a U-shaped mounting piece, the sealing side of the U-shaped mounting piece is detachably fixed with the mounting plate by fastening screws, the factory mounting column is embedded in the U-shaped mounting piece, mounting holes are provided on both sides of the U-shaped mounting piece, expansion screws are detachably embedded in the mounting holes, and the two sides of the U-shaped mounting piece are fixedly fitted with the factory mounting column by the expansion screws.

[0015] Beneficial effects of the utility model:

[0016] The utility model transfers the reaction heat of the tubular reactor to the medium cavity through the heat conduction groove. The medium in the medium cavity is heated by heat exchange and used for auxiliary granulation in the subsequent granulator, making full use of the waste heat generated by the neutralization reaction and reducing the consumption of power generation heat energy by subsequent granulation, thus saving energy.

[0017] After being combined, the mounting plate plays a role in limiting the tubular reactor and can be regarded as a limiting structure for the tubular reactor. The limiting structure can be installed with the plant installation column through the installation mechanism, while fixing the mounting plate, further ensuring the fixed installation of the tubular reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional schematic diagram of one side of the mounting plate of the utility model after being installed on a tubular reactor;

[0019] Figure 2 This is a three-dimensional schematic diagram of the other side of the mounting plate of the present invention after being installed on the tubular reactor;

[0020] Figure 3It is a three-dimensional schematic diagram of the mounting plate of the utility model;

[0021] Figure 4 This is an enlarged disassembly diagram of the medium feed pipe and the medium cavity of the present invention;

[0022] Figure 5 This is a cross-sectional schematic diagram of the mounting plate of the present invention at the medium cavity;

[0023] In the figure: 1. Mounting plate; 2. Heat conduction groove; 3. Medium cavity; 4. Medium feed pipe; 5. Medium discharge pipe;

[0024] 6. Fastening mechanism; 601. Fastening block; 602. Fastening bolt;

[0025] 7. Mounting mechanism; 701. U-shaped mounting piece; 702. Mounting hole; 703. Fastening screw;

[0026] 8. Tubular reactor. DETAILED DESCRIPTION

[0027] As follows, embodiments are further described with reference to the accompanying drawings.

[0028] like Figures 1 to 5 As shown, as a preferred embodiment 1, a waste heat recovery mechanism of a tubular reactor for diammonium phosphate production includes mounting plates 1 symmetrically arranged about the tubular reactor 8, and the mounting plates 1 are detachably fixed by a plurality of fastening mechanisms 6. The mounting plates 1 are each provided with half a heat conduction groove 2 on one side close to the tubular reactor 8, and the half heat conduction grooves 2 of the two mounting plates 1 cooperate to form a complete heat conduction groove 2. The tubular reactor 8 is embedded in the complete heat conduction groove 2 and both ends of the tubular reactor 8 pass through the heat conduction groove 2. The outer wall of the tubular reactor 8 forms a heat conduction fit with the heat conduction groove 2. A medium cavity 3 is provided in the mounting plate 1 near the heat conduction groove 2, and the medium cavity 3 forms a heat conduction fit with the heat conduction groove 2. A medium feed pipe 4 is provided on the side of the medium cavity 3 close to the feed end of the tubular reactor 8, and a medium discharge pipe 5 is provided on the side of the medium cavity 3 close to the discharge end of the tubular reactor 8.

[0029] In Example 1, a waste heat recovery mechanism for a tubular reactor used for diammonium phosphate production is provided. The device clamps the tubular reactor 8 through a fastening mechanism 6. On the one hand, it limits the position of the tubular reactor 8. On the other hand, it conducts heat through the heat conduction groove 2 to transfer heat to the medium cavity 3. The medium enters the medium cavity 3 through the medium feed pipe 4 and exchanges heat while passing through. The heated medium is transported to the granulation mechanism through the medium discharge pipe 5 to assist in heating the granulation process, thereby reducing the consumption of electrical thermal energy.

[0030] As a preferred embodiment 2, the heat conduction groove 2 is aligned with the tubular reactor 8, the medium cavity 3 is parallel to the heat conduction groove 2, and the layout shape of the medium cavity 3 is the same as the layout shape of the heat conduction groove 2. This reduces the heat conduction path and ensures that the heat during the neutralization reaction is directly poured into the medium cavity 3. At the same time, due to the unique shape of the tubular reactor 8, the medium cavity 3 can also be made to have a repeatedly bent shape, lengthening the medium cavity 3 and ensuring sufficient heat exchange.

[0031] The two ends of the medium cavity 3 pass through the mounting plate 1, and the medium cavity 3 is sealed and fixed with a medium feed pipe 4 at a penetration position on the side close to the feed end of the tubular reactor 8, and the medium cavity 3 is sealed and fixed with a medium discharge pipe 5 at a penetration position on the side close to the discharge end of the tubular reactor 8. The two ends of the medium cavity 3 are connected to the outside world through the medium feed pipe 4 and the medium discharge pipe 5 respectively, to ensure the heating effect and avoid setting up another pipeline in the medium cavity 3 to affect the heat transfer effect.

[0032] The medium cavity 3 is sealedly connected to the external medium supply mechanism via the medium feed pipe 4, and the medium cavity 3 is sealedly connected to the granulation mechanism via the medium discharge pipe 5. This facilitates the entry and exit of the medium, and the outflowing medium provides heat for the granulation process, reducing the electrical and thermal energy required during the granulation process.

[0033] As a preferred embodiment 3, a plurality of fastening mechanisms 6 are provided at equal intervals on the top and bottom of the mounting plate 1 on the side closest to the tubular reactor 8, with the fastening mechanisms 6 on the two mounting plates 1 corresponding to each other. This ensures that the mounting plates 1 are securely mounted on both sides of the tubular reactor 8. The fastening mechanisms 6 are used to secure the corresponding top and bottom sides of the mounting plates 1.

[0034] The number of the fastening mechanisms 6 located on the same side is not less than three, and at least the two ends and the middle position of the mounting plate 1 must be fixedly installed to ensure installation stability.

[0035] The fastening mechanism 6 includes a fastening block 601 disposed on the side of the mounting plate 1 near the tubular reactor 8. The fastening blocks 601 on the two mounting plates 1 correspond one to one, and the corresponding fastening blocks 601 are fixedly engaged by fastening bolts 602. Each fastening block 601 is provided with a retaining hole. When the corresponding fastening blocks 601 are brought into contact with each other, the retaining holes overlap. The screw of the fastening bolt 602 passes through the overlapping retaining holes, and the two ends are press-fitted by a nut, completing the fixation.

[0036] Preferably, the fastening block 601 and the mounting plate 1 are integrally formed.

[0037] As a preferred embodiment 4, mounting mechanisms 7 are detachably provided on the four corners of the mounting plate 1 on one side, and the mounting plate 1 forms a detachable fixed fit with the factory building mounting column through the mounting mechanism 7.

[0038] The mounting mechanism 7 includes a U-shaped mounting member 701. The sealing side of the U-shaped mounting member 701 is removably fixed to the mounting plate 1 via fastening screws 703. The factory installation column is embedded in the U-shaped mounting member 701. The U-shaped mounting member 701 has mounting holes 702 on both sides. Expansion screws are removably embedded in the mounting holes 702. The two sides of the U-shaped mounting member 701 are fixedly fitted to the factory installation column via the expansion screws. The mounting plate 1 as a whole becomes a mounting assembly for the tubular reactor 8. After the mounting plate 1 is assembled on both sides of the tubular reactor 8 to limit the tubular reactor 8, it can be installed with the factory installation column via the U-shaped mounting member 701 and the expansion screws, facilitating the arrangement of the mounting plate 1 and the tubular reactor 8 and ensuring stability.

[0039] As a preferred embodiment 5, the mounting plate 1 is made of a material with good heat transfer properties and corrosion resistance and high temperature resistance, thereby ensuring the heat transfer effect while ensuring the performance.

[0040] The working principle of this utility model:

[0041] The utility model provides a waste heat recovery mechanism for a tubular reactor used in diammonium phosphate production. The reaction heat of the tubular reactor 8 is transferred to the medium cavity 3 through the heat conduction groove 2. The medium in the medium cavity 3 is heated by heat exchange and then used for auxiliary granulation in a subsequent granulator. The waste heat generated by the neutralization reaction is fully utilized, and the consumption of heat energy for power generation in the subsequent granulation is reduced, thereby saving energy.

[0042] After being combined, the mounting plate 1 plays a role of limiting the tubular reactor and can be regarded as a limiting structure for the tubular reactor. The limiting structure can be installed with the plant installation column through the mounting mechanism 7, while fixing the mounting plate, further ensuring the fixed installation of the tubular reactor 8.

Claims

1. A waste heat recovery mechanism for a tubular reactor for diammonium phosphate production, characterized in that: The invention comprises mounting plates (1) symmetrically arranged about a tubular reactor (8), and the mounting plates (1) are detachably fixedly matched by a plurality of fastening mechanisms (6), the mounting plates (1) are each provided with a half heat conduction groove (2) on one side close to the tubular reactor (8), the half heat conduction grooves (2) of the two mounting plates (1) cooperate to form a complete heat conduction groove (2), the tubular reactor (8) is embedded in the complete heat conduction groove (2), and both ends of the tubular reactor (8) pass through the heat conduction groove (2), the outer wall of the tubular reactor (8) forms a heat conduction match with the heat conduction groove (2), the mounting plates (1) are provided with a medium cavity (3) close to the heat conduction groove (2), and the medium cavity (3) forms a heat conduction match with the heat conduction groove (2), the medium cavity (3) is provided with a medium feed pipe (4) on one side close to the feed end of the tubular reactor (8), and the medium cavity (3) is provided with a medium discharge pipe (5) on one side close to the discharge end of the tubular reactor (8).

2. The waste heat recovery mechanism of the tubular reactor for diammonium phosphate production according to claim 1, characterized in that: The heat conduction groove (2) is matched with the tubular reactor (8), the medium cavity (3) is parallel to the heat conduction groove (2), and the arrangement shape of the medium cavity (3) is the same as the arrangement shape of the heat conduction groove (2).

3. The waste heat recovery mechanism of the tubular reactor for diammonium phosphate production according to claim 2, characterized in that: The two ends of the medium cavity (3) pass through the mounting plate (1); a medium feed pipe (4) is sealed and fixedly fitted at a penetration position of the medium cavity (3) on the side close to the feed end of the tubular reactor (8); a medium discharge pipe (5) is sealed and fixedly fitted at a penetration position of the medium cavity (3) on the side close to the discharge end of the tubular reactor (8); and the two ends of the medium cavity (3) are respectively connected to the outside world through the medium feed pipe (4) and the medium discharge pipe (5).

4. The waste heat recovery mechanism of the tubular reactor for diammonium phosphate production according to claim 3, characterized in that: The medium cavity (3) is sealedly connected to an external medium supply mechanism via a medium feed pipe (4), and the medium cavity (3) is sealedly connected to a granulation mechanism via a medium discharge pipe (5).

5. The waste heat recovery mechanism of the tubular reactor for diammonium phosphate production according to claim 4, characterized in that: A plurality of fastening mechanisms (6) are evenly spaced apart on the top and bottom of the mounting plate (1) on the side close to the tubular reactor (8), and the fastening mechanisms (6) of the two mounting plates (1) correspond one to one.

6. The waste heat recovery mechanism of the tubular reactor for diammonium phosphate production according to claim 5, characterized in that: The number of the fastening mechanisms (6) located on the same side is not less than three.

7. The waste heat recovery mechanism of the tubular reactor for diammonium phosphate production according to claim 6, characterized in that: The fastening mechanism (6) comprises a fastening block (601) provided on a side of the mounting plate (1) close to the tubular reactor (8), the fastening blocks (601) of the two mounting plates (1) corresponding to each other, and the corresponding fastening blocks (601) are fixedly matched by fastening bolts (602).

8. The waste heat recovery mechanism of a tubular reactor for diammonium phosphate production according to any one of claims 1 to 7, characterized in that: The four corners of the mounting plate (1) on one side are all detachably provided with mounting mechanisms (7), and the mounting plate (1) forms a detachable fixed fit with the factory building mounting column through the mounting mechanism (7).

9. The waste heat recovery mechanism of the tubular reactor for diammonium phosphate production according to claim 8, characterized in that: The mounting mechanism (7) comprises a U-shaped mounting member (701), the sealing side of the U-shaped mounting member (701) is detachably fixedly matched with the mounting plate (1) via a fastening screw (703), the factory building mounting column is embedded in the U-shaped mounting member (701), mounting holes (702) are provided on both sides of the U-shaped mounting member (701), expansion screws are detachably embedded in the mounting holes (702), and both sides of the U-shaped mounting member (701) are fixedly matched with the factory building mounting column via the expansion screws.