High-efficiency energy-saving ammonium carbonate production system

Abstract

The utility model provides a kind of high-efficient energy-saving carbon ammonium production system, including carbonation reaction device and thick separation device, carbonation reaction device includes carbonation reaction tower, carbonation reaction tower includes shell and several heat exchange components, heat exchange component is made of several row pipe heat exchanger, barrier component is set between adjacent heat exchange components, barrier component includes conical cover and annular guide inclined plate, the edge of inner ring of annular guide inclined plate is above the conical cover, the edge of outer ring of annular guide inclined plate is fixed on the side wall of shell, the diameter of inner ring of annular guide inclined plate is equal to or less than the diameter of outer ring of conical cover, the height of outer ring of annular guide inclined plate is lower than inner ring, the vertical rotating shaft is rotatably arranged in the through hole of the middle part of conical cover, and fan blade is fixed on the rod body of vertical rotating shaft below the conical cover.The carbon ammonium production system is reasonable in overall design, has the advantages of complete raw material carbonation reaction, high carbonation reaction efficiency, ammonium salt crystallization not easy to accumulate and adhere on barrier component and heat exchanger, etc.

Description

Technical Field

[0001] This invention relates to a high-efficiency and energy-saving ammonium bicarbonate production system, belonging to the technical field of ammonium bicarbonate production equipment. Background Technology

[0002] Existing ammonium bicarbonate production equipment, such as the Chinese utility model patents “Authorization Announcement No.: CN220214871U; Authorization Announcement Date: December 22, 2023; Title: A Novel Ammonium Bicarbonate Production System for Carbon Emission Reduction and Resource Utilization” and “Authorization Announcement No.: CN220214872U; Authorization Announcement Date: December 22, 2023; Title: A Carbonization Reactor for Ammonium Bicarbonate Production”, uses a gas distribution plate to manage the liquid in layers, which improves the proportion of raw material reaction to a certain extent. However, it still has two defects: 1. The carbonization reactor is not equipped with a stirring structure, so its reaction efficiency is still not high enough; 2. Ammonium salt crystals will accumulate on the upper surface of the gas distribution plate and the heat exchanger. It is difficult to remove these ammonium salt crystals by simply relying on the slow flow of liquid in the carbonization reactor and the upward impact of carbon dioxide gas. The attached ammonium salt crystals will block the gas distribution plate and reduce the performance of the heat exchanger, thus affecting the performance of the carbonization reactor. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned technical deficiencies of existing ammonium bicarbonate production equipment by providing a highly efficient and energy-saving ammonium bicarbonate production system. This system includes a carbonization reaction device, a thickening separation device, a tail gas treatment device, and a mixing device for producing ammonia mother liquor by mixing the reacted mother liquor. The carbonization reaction tower in the carbonization reaction device not only separates the liquid into layers but also stirs to promote the carbonization reaction and prevents ammonium salt crystals from accumulating on the baffle components and heat exchangers. The tail gas treatment device and the mixing device respectively recover the tail gas and mother liquor. This ammonium bicarbonate production system has a reasonable overall design and advantages such as thorough raw material reaction, high carbonization reaction efficiency, and minimal accumulation and blockage of ammonium salt crystals. It also effectively recovers and reuses the tail gas and mother liquor, significantly reducing the production cost of ammonium bicarbonate.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] A high-efficiency and energy-saving ammonium bicarbonate production system includes a carbonization reaction device and a thickening separation device arranged sequentially. The carbonization reaction device includes a carbonization reaction tower, which includes a shell and several heat exchange components arranged sequentially from top to bottom within the shell. Each heat exchange component consists of several tube heat exchangers. A baffle assembly is provided between each pair of adjacent heat exchange components. The baffle assembly includes a conical cover fixed in a suspended manner in the middle of the shell and an annular guide plate coaxially arranged around the conical cover. The edge of the inner ring of the annular guide plate is located above the conical cover, and the edge of the outer ring of the annular guide plate is fixed to the side wall of the shell. The diameter of the inner ring of the annular guide plate is equal to or smaller than the diameter of the outer ring of the conical cover, and the height of the outer ring of the annular guide plate is lower than that of the inner ring. A through hole is provided in the middle of the conical cover, and a vertical rotating shaft inserted from the top of the shell is rotatably installed in the through hole. A fan blade is fixed on a rod located on the lower side of the conical cover.

[0006] By adopting the above technical solution, a high-efficiency and energy-saving ammonium bicarbonate production system is provided. In this ammonium bicarbonate production system, the carbonization reaction tower of the carbonization reaction device not only separates the liquid into layers, but also stirs to promote the carbonization reaction and prevents ammonium salt crystals from accumulating on the baffle components and heat exchangers. The overall design of this ammonium bicarbonate production system is reasonable, and it has the advantages of thorough raw material carbonization reaction, high carbonization reaction efficiency, and the fact that ammonium salt crystals are not easily accumulated and adhered to the baffle components and heat exchangers.

[0007] A further feature of the present invention is that a scraping structure is provided on the rod of the vertical rotating shaft on the upper side of the conical cover for the upper surface of the conical cover and the annular guide plate.

[0008] A further configuration of the present invention is as follows: the scraping structure includes a fixed seat fixed on a vertical rotating shaft and a conical cover scraping strip and an annular guide plate scraping strip fixed on the fixed seat. The line connecting the outer end of the conical cover scraping strip and the fixed end has a gap with the radial straight line, and the line connecting the outer end of the annular guide plate scraping strip and the fixed end also has a gap with the radial straight line. In the vertical direction, the inclination directions of the conical cover scraping strip and the annular guide plate scraping strip are opposite.

[0009] A further embodiment of the present invention is that the annular guide sloping plate scraping strip is directly fixed to the fixing base, or fixed to the conical cover scraping strip.

[0010] By adopting the above technical solution, a scraping structure is set on the vertical rotating shaft for the upper surface of the conical cover and the annular guide inclined plate. This scraping structure can not only scrape the upper surface of the conical cover and the annular guide inclined plate, but also push the ammonium salt crystals on the upper surface of the conical cover and the annular guide inclined plate toward their respective dropping edges during the scraping process.

[0011] A further feature of the present invention is that a first radial discharge port is provided on the annular guide inclined plate, and a second radial discharge port is provided on the conical cover, wherein the first radial discharge port and the second radial discharge port are staggered in the vertical direction.

[0012] By adopting the above technical solution, radial discharge ports that are staggered are set on the annular guide plate and the conical cover, which can further facilitate the scraping and discharge of materials by the scraping structure while ensuring good liquid stratification.

[0013] A further feature of the present invention is that the main body of the annular guide ramp and the plate body of the conical cover are parallel to each other, and the annular guide ramp and the inner wall of the outer shell are smoothly transitioned by an arc plate.

[0014] A further feature of the present invention is that the conical cover is fixed to the outer shell using a diagonal crossbar.

[0015] By adopting the above technical solution, the positional connection relationship between the annular guide plate and the conical cover is defined.

[0016] A further feature of the present invention is that the carbonization reaction device also includes a pre-reaction tower, which has the same structural principle as the carbonization reaction tower. The air inlet at the bottom of the side wall of the pre-reaction tower is connected to the exhaust port at the top of the carbonization reaction tower, the liquid outlet at the bottom of the side wall of the pre-reaction tower is connected to the liquid inlet at the top of the side wall of the carbonization reaction tower, and the liquid inlet of the pre-reaction tower is connected to the ammonia mother liquor inlet pipe.

[0017] By adopting the above technical solution, a pre-reaction tower is added to the carbonization reaction tower, which can effectively accelerate the reaction efficiency.

[0018] A further configuration of the present invention is as follows: the gas outlet at the top of the pre-reaction tower is connected to the tail gas treatment device, the tail gas discharge pipe of the tail gas treatment device is connected to the tail gas circulation pipe and the tail gas vent pipe respectively, the tail gas circulation pipe and the tail gas vent pipe are respectively equipped with solenoid valves, the other end of the tail gas circulation pipe is connected to the carbon dioxide raw material gas inlet pipe, and the gas outlet of the carbon dioxide raw material gas inlet pipe is connected to the gas inlet at the bottom of the side wall of the carbonization reaction tower through a compressor.

[0019] By adopting the above technical solution, the positional connection relationship of the exhaust gas treatment device has been defined.

[0020] A further configuration of the present invention is as follows: the inlet of the thick separation device is connected to the outlet at the bottom of the side wall of the carbonization reaction tower, the mother liquor separated by the thick separation device is discharged into the mixing device, the mixing device mixes the mother liquor with ammonia gas to form ammonia mother liquor, and the ammonia mother liquor in the mixing device is connected to the ammonia mother liquor inlet pipe via a conveying pump.

[0021] By adopting the above technical solution, the specific positional connection relationship of the mixing device is defined.

[0022] The main beneficial effects of this invention are:

[0023] 1. In the ammonium bicarbonate production system of the present invention, the carbonization reaction tower of the carbonization reaction device not only separates the liquid into layers, but also stirs to promote the carbonization reaction and avoids ammonium salt crystals accumulating on the baffle components and heat exchangers. The ammonium bicarbonate production system has a reasonable overall design and has the advantages of thorough raw material carbonization reaction, high carbonization reaction efficiency, and ammonium salt crystals not easily accumulating and adhering to the baffle components and heat exchangers.

[0024] 2. In the ammonium bicarbonate production system of the present invention, the carbonization reaction tower of the carbonization reaction device is equipped with a scraping structure on the vertical rotating shaft for the upper surface of the conical cover and the annular guide inclined plate. This scraping structure can not only scrape the upper surface of the conical cover and the annular guide inclined plate, but also push the ammonium salt crystals on the upper surface of the conical cover and the annular guide inclined plate toward their respective dropping edges during the scraping process.

[0025] 3. In the ammonium bicarbonate production system of the present invention, the carbonization reaction tower of the carbonization reaction device is provided with radially staggered discharge ports on the annular guide inclined plate and the conical cover, which can further facilitate the scraping and discharge of materials by the scraping structure while ensuring good liquid stratification. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram illustrating the principle of the production system of this invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the carbonization reaction tower in this invention;

[0029] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 yes Figure 2 Schematic diagram of the CC section;

[0031] Figure 5 yes Figure 2 Enlarged view of point B in the middle;

[0032] Figure 6 yes Figure 2 A schematic diagram of the structure of the DD cross section.

[0033] In the diagram, 1. Compressor; 2. Carbonization reaction tower; 3. Pre-reaction tower; 4. Thickness separation device; 5. Tail gas treatment device; 6. Mixing device; 7. Pump; 8. Ammonia mother liquor inlet pipe; 9. Tail gas circulation pipe; 10. Tail gas venting pipe; 11. Carbon dioxide raw material gas inlet pipe; 21. Outer shell; 22. Liquid inlet; 23. Drive motor; 24. Gas outlet; 25. Vertical rotating shaft; 26. Shell and tube heat exchanger; 27. Annular guide plate; 271. First radial discharge port; 28. Conical cover; 281. Second radial discharge port; 29. ​​Fan blade; 30. Fixing seat; 31. Conical cover scraper; 321. Annular guide plate straight scraper; 322. Annular guide plate curved scraper; 33. Gas inlet; 34. Liquid outlet. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] Example 1:

[0036] like Figures 1 to 4 As shown, a high-efficiency and energy-saving ammonium bicarbonate production system includes a carbonization reaction device and a thickening separation device 4 arranged sequentially. The carbonization reaction device includes a carbonization reaction tower 2 and a pre-reaction tower 3. The pre-reaction tower 3 has the same structural principle as the carbonization reaction tower 2. The air inlet at the bottom of the side wall of the pre-reaction tower 3 is connected to the exhaust port at the top of the carbonization reaction tower 2. The liquid outlet at the bottom of the side wall of the pre-reaction tower 3 is connected to the liquid inlet at the top of the side wall of the carbonization reaction tower 2. The liquid inlet of the pre-reaction tower 3 is connected to the ammonia mother liquor inlet pipe 8. The air outlet at the top of the pre-reaction tower 3 is connected to the tail gas treatment device 5. The tail gas discharge pipe of the tail gas treatment device 5 is connected to the tail gas circulation pipe 9 and the tail gas venting pipe 10, respectively. The tail gas circulation pipe 9 and the tail gas venting pipe 10 are respectively equipped with solenoid valves. The other end of the tail gas circulation pipe 9 is connected to the carbon dioxide raw material gas inlet pipe 11. The outlet of the carbon dioxide raw material gas inlet pipe 11 is connected to the air inlet at the bottom of the side wall of the carbonization reaction tower 2 through a compressor 1. The feed inlet of the thick separation device 4 is connected to the discharge outlet at the bottom of the side wall of the carbonization reaction tower 2. The mother liquor separated by the thick separation device 4 is discharged into the mixing device 6. The mixing device 6 mixes the mother liquor with ammonia gas to produce ammonia mother liquor. The ammonia mother liquor in the mixing device 6 is connected to the ammonia mother liquor inlet pipe 8 via a transfer pump.

[0037] The carbonization reaction tower 2 includes an outer shell 21 and several heat exchange components arranged sequentially from top to bottom within the shell 21. Each heat exchange component consists of several tube-and-shell heat exchangers 26. A partition assembly is provided between adjacent heat exchange components. The partition assembly includes a conical cover 28 suspended in the middle of the outer shell 21 and an annular guide plate 27 coaxially arranged around the conical cover 28. The conical cover 28 is fixed to the outer shell 21 by a diagonal connecting rod. The annular guide plate 27... The edge of the inner ring is located above the conical cover 28. The edge of the outer ring of the annular guide plate 27 is fixed to the side wall of the outer shell 21. The diameter of the inner ring of the annular guide plate 27 is equal to or smaller than the diameter of the outer ring of the conical cover 28. The outer ring of the annular guide plate 27 is lower than the inner ring. A through hole is provided in the middle of the conical cover 28. A vertical rotating shaft 25 inserted from the top of the outer shell 21 is rotatably installed in the through hole. A fan blade 29 is fixed on the rod body located on the lower side of the conical cover 28. The main body of the annular guide plate 27 is parallel to the plate body of the conical cover 28. The annular guide plate 27 and the inner wall of the outer shell 21 are smoothly transitioned by an arc plate.

[0038] A scraping structure is provided on the rod of the vertical rotating shaft 25 on the upper side of the conical cover 28 for the upper surfaces of the conical cover 28 and the annular guide ramp 27. The scraping structure includes a fixed seat 30 fixed on the vertical rotating shaft 25, a conical cover scraping strip 31 fixed on the fixed seat 30, and an annular guide ramp straight scraping strip 321 fixed on the conical cover scraping strip 31. There is a gap between the line connecting the outer end of the conical cover scraping strip 31 and the fixed end and the radial straight line. There is also a gap between the line connecting the outer end of the annular guide ramp straight scraping strip 321 and the fixed end and the radial straight line. In the vertical direction, the inclination direction of the conical cover scraping strip 31 and the annular guide ramp scraping strip is opposite. A first radial discharge port 271 is provided on the annular guide ramp 27, and a second radial discharge port 281 is provided on the conical cover 28. The first radial discharge port 271 and the second radial discharge port 281 are staggered in the vertical direction.

[0039] Example 2:

[0040] like Figure 5 and Figure 6 The difference between Embodiment 2 and Embodiment 1 is that the scraping structure includes a fixed seat 30 fixed on the vertical rotating shaft 25, a conical cover scraping strip 31 fixed on the fixed seat 30, and an annular guide inclined plate curved scraping strip 322.

[0041] Operating principle of ammonium bicarbonate production system:

[0042] Carbon dioxide feed gas is compressed by compressor 1 and sent into carbonization reaction tower 2 for carbonization reaction. Unreacted carbon dioxide gas in carbonization reaction tower 2 enters pre-reaction tower 3 through the outlet to pre-react with ammonia mother liquor. The exhaust gas from pre-reaction tower 3 is treated by exhaust gas treatment 5 and then discharged directly into the atmosphere through exhaust gas vent pipe 10, or discharged into carbon dioxide feed gas inlet pipe 11 through exhaust gas circulation pipe 9, and then enters carbonization reaction tower 2 through compressor 1. The liquid after reaction in pre-reaction tower 3 is discharged into carbonization reaction tower 2 by pump 7. The liquid after reaction in carbonization reaction tower 2 is discharged into thickening separation device 4 by pump 7 to separate ammonium carbonate product from mother liquor. The mother liquor separated by thickening separation device 4 enters mixing device 6 to mix with ammonia to produce ammonia mother liquor. The ammonia mother liquor is then pumped to ammonia mother liquor inlet pipe 8 by pump 7, and then enters pre-reaction tower 3 for pre-reaction.

[0043] The operating principle of the carbonization reaction tower:

[0044] Carbon dioxide feed gas enters through the inlet 33 at the bottom of the side wall of carbonization reaction tower 2, while ammonia mother liquor enters through the inlet 22 at the top of the side wall of carbonization reaction tower 2. The reacted liquid is discharged through the outlet 34 at the bottom of the side wall of carbonization reaction tower 2, and the reacted gas is discharged through the exhaust port 24 at the top of carbonization reaction tower 2. After entering the interior of carbonization reaction tower 2, ammonia mother liquor gradually moves downwards, while carbon dioxide feed gas gradually moves upwards. During the upward movement, the conical cover 28 traps some of the gas. At this time, the motor 23 drives the vertical shaft 25 to rotate, which in turn drives the fan blades 29 to refill the trapped gas. The reaction takes place in the liquid. The stirring and pushing of the fan blades 29 can not only accelerate the mixing of the liquid and carbon dioxide gas, but also agitate the liquid, which can prevent ammonium salt crystals from adhering to the heat exchanger to a certain extent. On the other hand, the rotating vertical shaft 25 will also drive the scraping structure to scrape the upper surface of the conical cover 28 and the annular guide plate 27. Since there is an angle between the side wall of the material pushed by the scraping structure and the radial line, the scraping structure can push the ammonium salt crystals to the discharge edge during the rotation process. Combined with the radial discharge port on the conical cover 28 and the annular guide plate 27, the ammonium salt crystals can be smoothly discharged.

Claims

1. A high-efficiency and energy-saving ammonium bicarbonate production system, comprising a carbonization reaction device and a thickening separation device (4) arranged sequentially, wherein the carbonization reaction device includes a carbonization reaction tower (2), the carbonization reaction tower (2) includes a shell (21) and a plurality of heat exchange components arranged sequentially from top to bottom within the shell (21), wherein the heat exchange components are composed of a plurality of tube heat exchangers (26), characterized in that: A partition assembly is provided between each of the two adjacent heat exchange components. The partition assembly includes a conical cover (28) fixed in the middle of the outer shell (21) in a suspended form and an annular guide plate (27) coaxially arranged around the conical cover (28). The edge of the inner ring of the annular guide plate (27) is located above the conical cover (28), and the edge of the outer ring of the annular guide plate (27) is fixed to the side wall of the outer shell (21). The diameter of the inner ring of the annular guide plate (27) is equal to or less than the diameter of the outer ring of the conical cover (28). The height of the outer ring of the annular guide plate (27) is lower than that of the inner ring. A through hole is provided in the middle of the conical cover (28). A vertical rotating shaft (25) inserted from the top of the outer shell (21) is rotatably placed in the through hole. A fan blade (29) is fixed on the rod of the vertical rotating shaft (25) located on the lower side of the conical cover (28).

2. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 1, characterized in that: The upper vertical shaft (25) of the conical cover (28) is provided with a scraping structure for the upper surface of the conical cover (28) and the annular guide plate (27).

3. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 2, characterized in that: The scraping structure includes a fixed seat (30) fixed on a vertical rotating shaft (25), a conical cover scraping strip (31) and an annular guide plate scraping strip fixed on the fixed seat (30). The line connecting the outer end of the conical cover scraping strip (31) and the fixed end has a gap with the radial straight line. The line connecting the outer end of the annular guide plate scraping strip and the fixed end also has a gap with the radial straight line. In the vertical direction, the inclination direction of the conical cover scraping strip (31) and the annular guide plate scraping strip is opposite.

4. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 3, characterized in that: The annular guide plate scraper is directly fixed to the fixing seat (30), or fixed to the conical cover scraper (31).

5. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 1, characterized in that: The annular guide plate (27) is provided with a first radial discharge port (271), and the conical cover (28) is provided with a second radial discharge port (281). The first radial discharge port (271) and the second radial discharge port (281) are staggered in the vertical direction.

6. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 1, characterized in that: The main body of the annular guide plate (27) is parallel to the plate of the conical cover (28), and the inner wall of the annular guide plate (27) and the outer shell (21) are smoothly transitioned by an arc plate.

7. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 6, characterized in that: The conical cover (28) is fixed to the outer shell (21) by means of a diagonal crossbar.

8. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 1, characterized in that: The carbonization reaction device also includes a pre-reaction tower (3), which has the same structure as the carbonization reaction tower (2). The air inlet at the bottom of the side wall of the pre-reaction tower (3) is connected to the exhaust port at the top of the carbonization reaction tower (2). The liquid outlet at the bottom of the side wall of the pre-reaction tower (3) is connected to the liquid inlet at the top of the side wall of the carbonization reaction tower (2). The liquid inlet of the pre-reaction tower (3) is connected to the ammonia mother liquor inlet pipe (8).

9. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 8, characterized in that: The outlet at the top of the pre-reaction tower (3) is connected to the tail gas treatment device (5). The tail gas discharge pipe of the tail gas treatment device (5) is connected to the tail gas circulation pipe (9) and the tail gas exhaust pipe (10) respectively. The tail gas circulation pipe (9) and the tail gas exhaust pipe (10) are respectively equipped with solenoid valves. The other end of the tail gas circulation pipe (9) is connected to the carbon dioxide raw material gas inlet pipe (11). The outlet of the carbon dioxide raw material gas inlet pipe (11) is connected to the inlet at the bottom of the side wall of the carbonization reaction tower (2) through the compressor (1).

10. The high-efficiency and energy-saving ammonium bicarbonate production system according to claim 9, characterized in that: The feed inlet of the thick separation device (4) is connected to the discharge outlet at the bottom of the side wall of the carbonization reaction tower (2). The mother liquor separated by the thick separation device (4) is discharged into the mixing device (6). The mixing device (6) mixes the mother liquor with ammonia gas to form ammonia mother liquor. The ammonia mother liquor in the mixing device (6) is connected to the ammonia mother liquor inlet pipe (8) via a transfer pump.

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