Drying and crushing system for molecular sieve

Abstract

The utility model belongs to the technical field of industrial molecular sieve preparation, and discloses a drying and crushing system for molecular sieves, which is characterized in that a material outlet of a roasting furnace is communicated with a material inlet of a jet mill, a material outlet of the jet mill is communicated with an inlet of a bag-type dust collector, and a gas outlet of the bag-type dust collector is communicated with an inlet of an induced draft fan; a process tail gas outlet and a flue gas outlet of the roasting furnace are communicated with an inlet of the cyclone separator through a flue gas pipeline, a gas outlet of the cyclone separator is connected with an inlet of the compressor, and an outlet of the compressor is connected with a gas inlet of the high-temperature waste heat recoverer. And a gas outlet of the high-temperature waste heat recoverer is connected with a gas inlet of the jet mill. The molecular sieve finished product prepared by the device is low in water content, small in particle size and low in energy consumption, and efficient and clean production is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial molecular sieve preparation, and particularly relates to a drying and pulverizing system for molecular sieves. Background Art

[0002] Molecular sieves are a class of crystalline substances with a highly ordered pore structure. The size range of their pores is usually at the molecular scale, hence the name. Their special structure makes molecular sieves widely used in the fields of adsorption, separation, and catalysis, demonstrating their importance.

[0003] In the field of molecular sieve applications, with higher requirements for product moisture content and particle size in certain application scenarios (as low moisture content as possible and as small particle size as possible), the existing molecular sieve production methods have obvious deficiencies in simultaneously considering these two indicators.

[0004] Prior art one (CN103553066A) discloses a combined continuous method for drying and pulverizing molecular sieves. In this method, the molecular sieve slurry first enters a belt conveyor for pre-dehydration to obtain molecular sieve material I with a moisture content of 50 - 60%; then the molecular sieve material I is sent to a hollow paddle dryer for pre-drying to obtain molecular sieve material II with a moisture content of 25 - 35%; then the molecular sieve material II is sent to a flash dryer for drying and pulverizing to obtain a molecular sieve finished product with a moisture content of less than 10%.

[0005] Prior art two (CN114516644A) discloses a method for drying and pulverizing SAPO-34 molecular sieves. In this method, the raw materials are sent to a first flash unit for the first flash, and then sent to a second flash unit for the second flash.

[0006] Prior art three (CN218796105U) discloses a molecular sieve pulverizing device for catalyst production, including a box body, a disc, a rotating disc, a threaded discharge groove, and a screening mechanism, etc. A disc is connected and provided in the middle of the upper side wall of the box body. On the left and right sides of the disc, several groups of first pulverizing teeth are respectively connected and provided. On the left and right sides of the disc, rotating discs are respectively provided. In the middle of the side of the rotating disc close to the disc, a threaded discharge groove is provided. On the outside of the threaded discharge groove, several groups of pulverizing gears are connected and provided. In addition, a screening mechanism is provided at the lower part inside the box body.

[0007] Prior art four (CN218796105U) discloses a molecular sieve pulverizer, including a load-bearing base and a support plate fixed on the top of the load-bearing base. A pulverizing box containing pulverizing rollers is fixed on one side of the support plate, and a driving motor is installed on the other side.

[0008] It can be seen from the above prior arts that in the drying and pulverizing of molecular sieves, the prior arts still have some deficiencies in aspects such as moisture control, pulverizing effect, labor intensity, and environmental friendliness, which are mainly reflected in:

[0009] (1) Difficult to control moisture content: The molecular sieve drying method usually uses molecular sieve slurry for drying with hollow paddle or / and flash drying, resulting in the moisture content of the final product being difficult to effectively control and generally being relatively high, making it difficult to meet some application scenarios with high requirements for low moisture content.

[0010] (2) Limited crushing effect: Using flash drying or crushing teeth or crushing rollers to crush molecular sieves, the crushing effect is relatively limited, and the particle size of the product is relatively coarse, making it difficult to meet some application scenarios with small particle sizes.

[0011] (3) High labor intensity of workers: The existing technology requires manual operation to put molecular sieves into the crusher, which makes the labor intensity of workers relatively high. This not only increases the production cost but also poses certain potential safety hazards.

[0012] (4) On-site environmental problems: Due to the small bulk ratio and fine particles of molecular sieves, manual feeding will generate a large amount of dust, resulting in a poor on-site environment, causing certain pollution to the environment and also posing hazards and impacts on the health of operators.

[0013] (5) Complex equipment: The crushing equipment has a complex structure, high manufacturing cost, complex operation, and high failure rate.

[0014] Therefore, it has become an urgent need in the field to develop a drying and crushing system for molecular sieves to efficiently and cleanly produce molecular sieve products with low moisture content and small particle sizes. Summary of the utility model

[0015] The purpose of the present utility model is to provide a drying and crushing system for molecular sieves to solve at least one of the above problems existing in the prior art.

[0016] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0017] A drying and pulverizing system for molecular sieves, comprising a roasting furnace, a compressor, a jet mill, a bag filter, a induced draft fan, a cyclone separator and a high-temperature waste heat recovery device. The material outlet of the roasting furnace is communicated with the material inlet of the jet mill through a jet mill feed pipeline. The material outlet of the jet mill is communicated with the inlet of the bag filter through a bag filter feed pipeline. The gas outlet of the bag filter is communicated with the inlet of the induced draft fan through an induced draft fan inlet pipeline. The process tail gas outlet of the roasting furnace is communicated with a mixed tail gas pipeline through a high-temperature tail gas pipeline. The flue gas outlet of the roasting furnace is communicated with the mixed tail gas pipeline through a flue gas pipeline. The outlet of the mixed tail gas pipeline is communicated with the inlet of the cyclone separator through a cyclone separator inlet pipeline. The gas outlet of the cyclone separator is connected with the inlet of the compressor through a compressor inlet pipeline. The outlet of the compressor is connected with the gas inlet of the high-temperature waste heat recovery device through a high-temperature waste heat recovery device gas inlet pipeline. The gas outlet of the high-temperature waste heat recovery device is connected with the gas inlet of the jet mill through a jet mill inlet pipeline.

[0018] As a preferred technical solution in the present utility model, a molecular sieve raw material feed pipeline is connected to the material inlet of the roasting furnace.

[0019] As a preferred technical solution in the present utility model, the outlet of the induced draft fan is communicated with a low-temperature waste heat recovery system through an induced draft fan outlet pipeline.

[0020] As a preferred technical solution in the present utility model, the material outlet of the cyclone separator is communicated with a dust packaging system through a cyclone separator discharge pipeline.

[0021] As a preferred technical solution in the present utility model, a number of heat transfer water pipes are arranged inside the high-temperature waste heat recovery device, and a number of groups of fins are evenly arranged outside each heat transfer water pipe. A cold water inlet pipeline communicated with one end of all the heat transfer water pipes is arranged at the lower part of the high-temperature waste heat recovery device. A hot water outlet pipeline communicated with the other end of all the heat transfer water pipes is arranged at the upper part of the high-temperature waste heat recovery device. A water outlet flow regulating valve and a water outlet temperature detector are installed on the hot water outlet pipeline. The hot water outlet pipeline is communicated with a downstream hot water using system.

[0022] As a preferred technical solution in the present utility model, a high-temperature waste heat recovery device gas inlet temperature detector is installed on the high-temperature waste heat recovery device gas inlet pipeline. A high-temperature waste heat recovery device gas outlet temperature detector, a pipeline heat insulation sleeve and a high-temperature waste heat pressure detector are installed on the jet mill inlet pipeline.

[0023] As a preferred technical solution in the present utility model, the material outlet of the bag filter is communicated with a product packaging system through a bag filter discharge pipeline.

[0024] Beneficial effects:

[0025] 1. Low moisture content of the product: By further roasting the product after flash drying in the prior art in a roasting furnace, a molecular sieve product with a moisture content lower than 5% can be obtained, which effectively meets the stringent requirements of the application end for products with low moisture content.

[0026] 2. Small particle size of the product: Compared with the traditional air classifier that uses normal-temperature compressed air to cause an increase in the moisture content of the product, high-temperature gas compressed by a compressor is transported to the jet mill, and the low-moisture solid powder molecular sieve is deeply pulverized in the jet mill. While maintaining the low moisture content of the product, a molecular sieve product with a small particle size can be obtained, which effectively meets the stringent requirements of the application end for products with low moisture content and small particle size.

[0027] 3. High-efficiency and clean production: The drying and pulverization of the molecular sieve can be ensured to be carried out in a closed system throughout the process, eliminating cumbersome steps such as manual feeding, reducing the labor intensity of workers, improving production efficiency, and ensuring no dust at the site, protecting the health of operators and environmental safety.

[0028] 4. Low energy consumption: The compressed high-temperature gas used by the air classifier is compressed from the flue gas of the roasting furnace and the furnace process gas after mixing through a compressor. This not only improves the pulverization effect but also reduces the need for traditional air classifiers, additional air compressors, freeze dryers or adsorption dryers, and precision filters, etc., reducing equipment investment and energy consumption. In addition, the tail gas of the bag filter can go to the waste heat recovery system, realizing the effective recovery and reuse of energy, and further reducing the energy consumption of the overall production process. Description of the Drawings

[0029] Figure 1 It is the system structure diagram of the present utility model;

[0030] Figure 2 It is the cross-sectional schematic diagram of the high-temperature waste heat recovery device in the present utility model;

[0031] Figure 3 It is the particle size distribution diagram of the molecular sieve product in the embodiment;

[0032] Figure 4 It is the particle size distribution diagram of the molecular sieve product in the comparative example.

[0033] In the figure: 1-roasting furnace; 2-compressor; 3-air classifier mill; 4-bag filter; 5-induced draft fan; 6-cyclone separator; 7-high-temperature waste heat recovery unit; 11-molecular sieve raw material feed pipeline; 13-smoke pipeline; 14-high-temperature tail gas pipeline; 15-mixed tail gas pipeline; 61-cyclone separator inlet pipeline; 62-cyclone separator discharge pipeline; 71-high-temperature waste heat recovery unit gas inlet pipeline; 72-heat transfer water pipe; 721-fin; 73-cold water inlet pipeline; 74-hot water outlet pipeline; 741-outlet water flow regulating valve; 742-outlet water temperature detector; 75-high-temperature waste heat recovery unit gas inlet temperature detector; 76-high-temperature waste heat recovery unit gas outlet temperature detector; 31-air classifier mill feed pipeline; 32-air classifier mill inlet gas pipeline; 321-pipeline insulation sleeve; 41-bag filter feed pipeline; 42-bag filter discharge pipeline; 51-fan inlet gas pipeline; 52-induced draft fan outlet gas pipeline. Detailed implementation mode

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the present invention in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. It should be noted here that the description of these implementation modes is used to help understand the present invention, but does not constitute a limitation to the present invention.

[0035] Embodiment:

[0036] As Figure 1 and Figure 2 shown, this embodiment provides a drying and pulverizing system for molecular sieves, including a roasting furnace 1, a compressor 2, an air classifier mill 3, a bag filter 4, an induced draft fan 5, a cyclone separator 6, and a high-temperature waste heat recovery unit 7. The roasting furnace 1 is of a conventional structure and is used for the deep drying of molecular sieves. Therefore, what comes out of the roasting furnace 1 is the molecular sieve powder with low moisture content, that is, the low-moisture-content solid powder molecular sieve. The material outlet of the roasting furnace 1 is connected to the material inlet of the air classifier mill 3 through the air classifier mill feed pipeline 31. The air classifier mill 3 is used to deeply pulverize the low-moisture-content solid powder molecular sieve under the action of compressed high-temperature mixed tail gas to obtain the low-moisture-content small-particle-size solid molecular sieve powder. The material outlet of the air classifier mill 3 is connected to the inlet of the bag filter 4 through the bag filter feed pipeline 41. The bag filter 4 is used to collect the low-moisture-content small-particle-size solid molecular sieve powder produced by the air classifier mill 3 to obtain the low-moisture-content small-particle-size solid molecular sieve finished product. The gas outlet of the bag filter 4 is connected to the inlet of the induced draft fan 5 through the induced draft fan inlet gas pipeline 51. The induced draft fan 5 is used to send the tail gas of the bag filter 4 downstream for heat recovery and utilization.

[0037] The process tail gas outlet of the roasting furnace 1 is connected to the mixed tail gas pipeline 15 through the high-temperature tail gas pipeline 13, and the flue gas outlet of the roasting furnace 1 is connected to the mixed tail gas pipeline 15 through the flue gas pipeline 14. The outlet of the mixed tail gas pipeline 15 is connected to the inlet of the cyclone separator 6 through the cyclone separator inlet pipeline 61. The dust and particulate matter in the process tail gas and flue gas of the roasting furnace are collected by the cyclone separator 6. The gas outlet of the cyclone separator 6 is connected to the inlet of the compressor 2 through the compressor inlet pipeline 22. The outlet of the compressor 2 is connected to the gas inlet of the high-temperature waste heat recovery device 7 through the high-temperature waste heat recovery device gas inlet pipeline 71. The high-temperature waste heat recovery device partially recovers the heat in the high-temperature mixed tail gas and prepares hot water for recycling. The gas outlet of the high-temperature waste heat recovery device 7 is connected to the gas inlet of the jet mill 3 through the jet mill inlet pipeline 32, so that the jet mill 3 is equipped with compressed high-temperature gas. Under the action of the compressed high-temperature mixed tail gas, the jet mill 3 can deeply crush the solid powder molecular sieve with low moisture content.

[0038] As a preferred implementation in this embodiment, it should be further noted that the material inlet of the roasting furnace 1 is connected with a molecular sieve raw material feeding pipeline 11. The upstream of the molecular sieve raw material feeding pipeline 11 can be connected to a flash drying system, or to a molecular sieve slurry system or a molecular sieve filter cake system, improving the practicability of the system.

[0039] As a preferred implementation in this embodiment, it should be further noted that the outlet of the induced draft fan 5 is connected to the low-temperature waste heat recovery system through the induced draft fan outlet pipeline 52, further saving energy, reducing energy consumption and improving practicability.

[0040] As a preferred implementation in this embodiment, it should be further noted that the material outlet of the cyclone separator 6 is connected to the dust packaging system through the cyclone separator discharge pipeline 62, ensuring no dust generation, and thus ensuring the health of operators and environmental safety.

[0041] As a preferred implementation in this embodiment, it should be further noted that a number of heat transfer water pipes 72 are provided inside the high-temperature waste heat recovery device 7, and a number of groups of fins 721 are evenly arranged outside each heat transfer water pipe 72, so as to achieve efficient heat transfer; a cold water inlet pipeline 73 communicating with one end of all the heat transfer water pipes 72 is provided at the lower part of the high-temperature waste heat recovery device 7, and a hot water outlet pipeline 74 communicating with the other end of all the heat transfer water pipes 72 is provided at the upper part of the high-temperature waste heat recovery device 7. An outlet water flow regulating valve 741 and an outlet water temperature detector 742 are installed on the hot water outlet pipeline 74. The hot water outlet pipeline 74 is connected to the downstream hot water using system, ensuring the efficient use of energy, and effectively controlling the use of water resources through the outlet water flow regulating valve 741 and the outlet water temperature detector 742.

[0042] As a preferred implementation in this embodiment, it should be further noted that a high-temperature waste heat recovery device gas inlet temperature detector 75 is installed on the high-temperature waste heat recovery device gas inlet pipeline 71; a high-temperature waste heat recovery device gas outlet temperature detector 76, a pipeline heat preservation sleeve 321 and a high-temperature waste heat pressure detector are installed on the airflow mill inlet pipeline 32. Thus, the inlet temperature and outlet temperature of the high-temperature waste heat recovery device 7 can be detected in real time, facilitating real-time adjustment of the system. Combining the pipeline heat preservation sleeve 321 and the high-temperature waste heat pressure detector can avoid energy waste and ensure the safe operation of the system, so as to achieve the best energy utilization efficiency.

[0043] As a preferred implementation in this embodiment, it should be further noted that the material outlet of the bag filter 4 is connected to the product packaging system through a bag filter discharge pipeline 42.

[0044] As Figure 3 shown, a drying and pulverizing system for molecular sieves provided in this embodiment finally obtains a molecular sieve product with a moisture content of 4.2%, D50 of 3.28um, and D90 of 5.58um.

[0045] Comparative example:

[0046] As Figure 4 shown, a combined continuous method for drying and pulverizing molecular sieves disclosed in CN103553066A is adopted. First, the molecular sieve slurry is fed into a belt conveyor for pre-dehydration to obtain molecular sieve material I with a moisture content of 50 - 60%; then the molecular sieve material I is fed into a hollow paddle dryer for pre-drying to obtain molecular sieve material II with a moisture content of 25 - 35%. Then the molecular sieve material II is fed into a flash dryer for drying and pulverizing, and the obtained molecular sieve finished product has a moisture content of 10%, D50 of 4.42um, and D90 of 22.33um.

[0047] As can be seen from the above, the molecular sieve finished product finally obtained by using the drying and pulverizing system of this embodiment is significantly better than the molecular sieve finished product obtained by using the prior art.

[0048] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A drying and pulverizing system for molecular sieves, characterized in that, The invention comprises a roasting furnace (1), a compressor (2), an air flow mill (3), a bag dust collector (4), an induced draft fan (5), a cyclone separator (6) and a high-temperature waste heat recovery device (7); the material outlet of the roasting furnace (1) is connected to the material inlet of the air flow mill (3) through an air flow mill feed pipeline (31); the material outlet of the air flow mill (3) is connected to the inlet of the bag dust collector (4) through a bag dust collector feed pipeline (41); the gas outlet of the bag dust collector (4) is connected to the inlet of the induced draft fan (5) through an induced draft fan air intake pipeline (51); The process tail gas outlet of the roasting furnace (1) is connected to the mixed tail gas pipeline (15) through the high-temperature tail gas pipeline (13), the flue gas outlet of the roasting furnace (1) is connected to the mixed tail gas pipeline (15) through the flue gas pipeline (14), the outlet of the mixed tail gas pipeline (15) is connected to the inlet of the cyclone separator (6) through the cyclone separator inlet pipeline (61), the gas outlet of the cyclone separator (6) is connected to the inlet of the compressor (2) through the compressor inlet pipeline (22), the outlet of the compressor (2) is connected to the gas inlet of the high-temperature waste heat recovery device (7) through the high-temperature waste heat recovery device gas inlet pipeline (71), and the gas outlet of the high-temperature waste heat recovery device (7) is connected to the gas inlet of the air mill (3) through the air mill inlet pipeline (32).

2. A drying and pulverizing system for molecular sieves according to claim 1, characterized in that, The material inlet of the roasting furnace (1) is connected to a molecular sieve raw material feed pipeline (11).

3. A drying and pulverizing system for molecular sieves according to claim 1, characterized in that, The outlet of the induced draft fan (5) is connected to the low-temperature waste heat recovery system via an induced draft fan air outlet pipeline (52).

4. A drying and pulverizing system for molecular sieves according to claim 1, characterized in that, The material outlet of the cyclone separator (6) is connected to the dust packaging system through a cyclone separator discharge pipeline (62).

5. A drying and pulverizing system for molecular sieves according to claim 1, wherein The high-temperature waste heat recovery device (7) is provided with a plurality of heat transfer pipes (72) inside, and a plurality of groups of fins (721) are evenly arranged outside each heat transfer pipe (72); a cold water inlet pipeline (73) connected to one end of all the heat transfer pipes (72) is provided at the lower part of the high-temperature waste heat recovery device (7); a hot water outlet pipeline (74) connected to the other end of all the heat transfer pipes (72) is provided at the upper part of the high-temperature waste heat recovery device (7); a water outlet flow regulating valve (741) and a water outlet temperature detector (742) are installed on the hot water outlet pipeline (74); and the hot water outlet pipeline (74) is connected to a downstream hot water system.

6. A drying and pulverizing system for molecular sieve according to claim 1 or 5, characterized in that A high-temperature waste heat recovery device gas inlet temperature detector (75) is installed on the high-temperature waste heat recovery device gas inlet pipeline (71); a high-temperature waste heat recovery device gas outlet temperature detector (76), a pipeline insulation sleeve (321) and a high-temperature waste heat pressure detector are installed on the air flow mill air inlet pipeline (32).

7. A drying and pulverizing system for molecular sieves according to claim 1, wherein, The material outlet of the bag filter (4) is connected to the product packaging system through the bag filter discharge pipeline (42).

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