Solid catalyst drying and crushing device

Abstract

The utility model relates to the technical field of solid catalyst drying and crushing, in particular to a solid catalyst drying and crushing device. The solid catalyst drying and crushing device comprises a liquid preparation tank, the liquid preparation tank is connected with a hydrolysis kettle through a reaction kettle, the hydrolysis kettle is connected with a pre-drying box through a filter, the pre-drying box is connected with a high-temperature firing furnace through a ball-milling crusher, and a dispersing mixer is arranged in the liquid preparation tank. According to the device, through cooperative use of the pre-drying box, the ball-milling pulverizer and the high-temperature firing furnace, a filtered solid phase is dried and pulverized firstly and then roasted, so that an active component precursor is more uniformly converted into an active phase in the roasting process, and an obtained roasted product is more uniform in component and structure.

Description

Technical Field

[0001] The utility model relates to the technical field of solid catalyst drying and crushing, in particular to a solid catalyst drying and crushing device. Background Art

[0002] SCR denitration catalyst is used in SCR denitration system to promote the reductant to selectively react with nitrogen oxides in flue gas at a certain temperature, converting nitrogen oxides into harmless nitrogen and water. The preparation process of SCR denitration catalyst generally includes the following steps: solution preparation → sulfuric acid and metatitanic acid react at 100-120℃ → add ammonia water for precipitation, add urea to the supernatant, hydrolyze at 100-120℃ → filter → solid phase roasting → crushing.

[0003] In actual production, the filtered solid phase is often directly calcined. However, during the calcination process, the material is in a block or large particle state, and the internal mass transfer process is relatively slow, which leads to changes in internal components that are inconsistent with the surface, affecting the performance uniformity of the catalyst. Moreover, the existing device has the problem of low heat utilization efficiency during the production process. The high-temperature gas phase generated by the pre-drying box and the high-temperature firing furnace is not utilized and is directly discharged to the exhaust gas treatment device, resulting in energy loss and increased production costs. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a solid catalyst drying and crushing device, which, through the coordinated use of a pre-drying box, a ball mill and a high-temperature firing furnace, first dries and crushes the filtered solid phase, and then roasts it, so that the active ingredient precursor is more evenly converted into the active phase during the roasting process, and the resulting roasting product is more uniform in composition and structure; through the setting of the inlet dispersion mixer pipeline and the dispersion mixer, the gas phase with a higher temperature is used to heat the liquid phase in the liquid preparation tank, and at the same time, the gas phase enters the liquid preparation tank in the form of bubbles, which increases the mixing uniformity of the liquid phase; through the coordinated use of the heat exchanger and the hydrolysis kettle insulation jacket, the high-temperature gas phase generated in the high-temperature firing furnace is used for the insulation of the hydrolysis kettle after heat exchange, which greatly improves the heat utilization efficiency; through the setting of the liquid phase outlet filter pipeline, the ball mill is flushed in advance, which saves water while avoiding the mutual influence between different batches of materials before and after, thereby improving the product quality.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The solid catalyst drying and crushing device comprises a liquid preparation tank, which is connected to a hydrolysis kettle through a reaction kettle, which is connected to a pre-drying box through a filter, which is connected to a high-temperature firing furnace through a ball mill, and a dispersing mixer is arranged inside the liquid preparation tank.

[0007] A fine crusher can also be installed after the high-temperature firing furnace, especially when there are requirements for the catalyst particle size. The temperature of the pre-drying box is 90-130°C. The dispersing mixer is located at the bottom of the liquid preparation tank. A static stratification device is provided between the reactor and the hydrolysis reactor.

[0008] The hydrolysis kettle is provided with a hydrolysis kettle insulation jacket on the outside, and a stirrer is provided inside the reaction kettle and the hydrolysis kettle. The hydrolysis kettle insulation jacket is used to keep the hydrolysis kettle warm.

[0009] The high temperature firing furnace is connected to the hydrolysis kettle insulation jacket through a heat exchanger, a pipeline for entering the hydrolysis kettle insulation jacket is arranged between the heat exchanger and the hydrolysis kettle insulation jacket, an inert gas inlet is arranged on the high temperature firing furnace, and a temperature control water inlet pipeline is connected to the heat exchanger.

[0010] The filter is provided with a filter plate inside, and a filter solid phase discharge port is provided on the vertical wall of the filter. The filter solid phase discharge port is located above the filter plate. A vacuum device is connected to the filter, and the connection between the vacuum device and the filter is located below the filter plate.

[0011] The bottom of the filter is connected to the ball mill through a liquid phase filter outlet pipeline, and the liquid phase filter outlet pipeline is connected to a flushing water pipeline.

[0012] When different batches of materials are produced, the solid phase processed by the filter enters the pre-drying box for drying, and the liquid phase enters the ball mill for pre-rinsing, and then is rinsed through the flushing water pipe to ensure that different products will not affect each other.

[0013] The pre-drying box is provided with a pre-drying box gas phase inlet, and the pre-drying box is connected with the dispersing mixer through an inlet dispersing mixer pipeline, and the dispersing mixer is provided with a dispersing port.

[0014] The working principle of the utility model is:

[0015] Sulfuric acid and metatitanic acid are mixed in a liquid preparation tank according to (1-5):1, and then transferred to a reactor, reacted at 100-120°C for 0.5-1 hour, and then cooled to room temperature. After the reaction is completed, a titanyl sulfate suspension is obtained, and ammonia water is added to the suspension to adjust the pH to 2-3, and the suspension is allowed to stand for stratification, and then the supernatant is taken to obtain a clear titanyl sulfate solution; then the solution is transferred to a hydrolysis kettle, urea is added, and the solution is hydrolyzed at 100-120°C for 1-3 hours, and then the temperature is reduced to 70-80°C, and the solution is aged for 20-35 minutes. After the aging is completed, the solution is cooled to room temperature, and then the solution is transferred to a filter for filtration and washing. A white precipitate is obtained; the white precipitate enters the pre-drying box for drying, the liquid phase enters the ball mill, is pre-rinsed, and then rinsed through the flushing water pipeline. The dried product enters the ball mill for crushing. After crushing, it enters the high-temperature firing furnace for roasting; the high-temperature gas phase generated by the high-temperature firing furnace exchanges heat with the temperature-controlled water through the heat exchanger, and the heated temperature-controlled water is used for the temperature control of the hydrolysis kettle. The gas phase in the pre-drying box enters the disperser mixer through the dispersing mixer pipeline, which is used to heat the liquid phase in the liquid preparation tank. At the same time, the gas phase enters the liquid preparation tank in the form of bubbles to increase the mixing uniformity of the liquid phase. Among them, a fine crusher can also be set after the high-temperature firing furnace, especially when there are requirements for the catalyst particle size. The temperature of the pre-drying box is 90-130℃. The dispersing mixer is located at the bottom of the liquid preparation tank. A static stratification device is provided between the reactor and the hydrolysis kettle.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The solid catalyst drying and crushing device of the utility model is used in conjunction with a pre-drying box, a ball mill and a high-temperature firing furnace to first dry and crush the filtered solid phase, and then roast it, so that the active ingredient precursor is more evenly converted into the active phase during the roasting process, and the resulting roasting product is more uniform in composition and structure; through the setting of the inlet dispersion mixer pipeline and the dispersion mixer, the gas phase with a higher temperature is used to heat the liquid phase in the liquid preparation tank, and at the same time, the gas phase enters the liquid preparation tank in the form of bubbles, which increases the mixing uniformity of the liquid phase; through the coordinated use of the heat exchanger and the hydrolysis kettle insulation jacket, the high-temperature gas phase generated in the high-temperature firing furnace is used for the insulation of the hydrolysis kettle after heat exchange, which greatly improves the heat utilization efficiency; through the setting of the liquid phase outlet filter pipeline, the ball mill is flushed in advance, which saves water while avoiding the mutual influence between different batches of materials before and after, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the solid catalyst drying and crushing device of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the dispersing mixer of the utility model;

[0020] In the figure: 1. liquid preparation tank; 2. reactor; 3. hydrolysis reactor; 4. filter; 5. pre-drying box; 6. ball mill; 7. high-temperature firing furnace; 8. heat exchanger; 9. disperser mixer; 10. filter plate; 11. solid phase discharge port of filter; 12. gas phase inlet of pre-drying box; 13. pipeline for dispersing mixer; 14. pipeline for liquid phase out of filter; 15. flushing water pipeline; 16. hydrolysis reactor insulation jacket; 17. pipeline for hydrolysis reactor insulation jacket; 18. dispersion port. DETAILED DESCRIPTION

[0021] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] Example 1

[0023] like Figure 1 As shown, the solid catalyst drying and crushing device includes a liquid preparation tank 1, the liquid preparation tank 1 is connected to the hydrolysis kettle 3 through the reactor 2, the hydrolysis kettle 3 is connected to the pre-drying box 5 through the filter 4, the pre-drying box 5 is connected to the high-temperature firing furnace 7 through the ball mill 6, and a dispersing mixer 9 is provided inside the liquid preparation tank 1. A fine crusher can also be set after the high-temperature firing furnace 7, especially when there is a requirement for the catalyst particle size. The temperature of the pre-drying box 5 is 110°C. The dispersing mixer 9 is located at the bottom of the liquid preparation tank 1. A static stratification device is provided between the reactor 2 and the hydrolysis kettle 3. A hydrolysis kettle insulation jacket 16 is provided on the outside of the hydrolysis kettle 3, and a stirrer is provided inside the reactor 2 and the hydrolysis kettle 3. The high-temperature firing furnace 7 is connected to the hydrolysis kettle insulation jacket 16 through the heat exchanger 8, and a hydrolysis kettle insulation jacket inlet pipe 17 is provided between the heat exchanger 8 and the hydrolysis kettle insulation jacket 16, and an inert gas inlet is provided on the high-temperature firing furnace 7, and a temperature control water inlet pipe is connected to the heat exchanger 8. A filter plate 10 is provided inside the filter 4, and a filter solid phase discharge port 11 is provided on the vertical wall of the filter 4. The filter solid phase discharge port 11 is located above the filter plate 10. A vacuum device is connected to the filter 4, and the connection between the vacuum device and the filter 4 is located below the filter plate 10. The bottom of the filter 4 is connected to the ball mill 6 through a liquid phase filter outlet pipe 14, and a flushing water pipe 15 is connected to the liquid phase filter outlet pipe 14. Figure 2 As shown, the pre-drying box 5 is provided with a pre-drying box gas phase inlet 12 , and the pre-drying box 5 is connected to the dispersing mixer 9 through a dispersing mixer inlet pipe 13 , and the dispersing mixer 9 is provided with a dispersing port 18 .

[0024] The above solid catalyst drying and crushing device, when in operation, comprises the following steps:

[0025] (1) sulfuric acid and metatitanic acid are mixed in a liquid preparation tank 1 according to (1-5): 1, and then transferred to a reactor 2, reacted at 100-120°C for 0.5-1 hour, and then cooled to room temperature. After the reaction is completed, a titanyl sulfate suspension is obtained. Ammonia water is added to the suspension to adjust the pH to 2-3, and the suspension is allowed to stand for stratification, and then the supernatant is taken to obtain a clear titanyl sulfate solution; (2) then transferred to a hydrolysis reactor 3, urea is added, and hydrolysis reaction is carried out at 100-120°C for 1-3 hours, and then the temperature is reduced to 70-80°C, and the mixture is aged for 20-35 minutes. After the aging is completed, the mixture is cooled to room temperature and transferred to a filter 4 for filtration and washing to obtain a white precipitate. (3) The white precipitate enters the pre-drying box 5 for drying, and the liquid phase enters the ball mill 6 for pre-rinsing, and then rinsed through the flushing water pipe 15. The dried product enters the ball mill 6 for crushing. After crushing, it enters the high-temperature firing furnace 7 for roasting; (4) The high-temperature gas phase generated by the high-temperature firing furnace 7 exchanges heat with the temperature-controlled water through the heat exchanger 8. The heated temperature-controlled water is used for temperature control of the hydrolysis kettle 3. The gas phase in the pre-drying box 5 enters the disperser mixer 9 through the disperser mixer inlet pipe 13, which is used to heat the liquid phase in the liquid preparation tank 1. At the same time, the gas phase enters the liquid preparation tank 1 in the form of bubbles to increase the mixing uniformity of the liquid phase.

Claims

1. A solid catalyst drying and crushing device, characterized in that: The invention comprises a liquid preparation tank (1), wherein the liquid preparation tank (1) is connected to a hydrolysis tank (3) via a reaction tank (2), the hydrolysis tank (3) is connected to a pre-drying box (5) via a filter (4), the pre-drying box (5) is connected to a high-temperature firing furnace (7) via a ball mill (6), and a dispersing mixer (9) is provided inside the liquid preparation tank (1); the pre-drying box (5) is provided with a pre-drying box gas phase inlet (12), the pre-drying box (5) is connected to the dispersing mixer (9) via a dispersing mixer inlet pipe (13), and the dispersing mixer (9) is provided with a dispersing port (18).

2. The solid catalyst drying and pulverizing device according to claim 1, characterized in that: The hydrolysis kettle (3) is provided with a hydrolysis kettle insulation jacket (16) on the outside, and a stirrer is provided inside the reaction kettle (2) and the hydrolysis kettle (3).

3. The solid catalyst drying and pulverizing device according to claim 2, characterized in that: The high-temperature firing furnace (7) is connected to the hydrolysis kettle insulation jacket (16) via a heat exchanger (8); a hydrolysis kettle insulation jacket inlet pipe (17) is provided between the heat exchanger (8) and the hydrolysis kettle insulation jacket (16); an inert gas inlet is provided on the high-temperature firing furnace (7); and a temperature-controlled water inlet pipe is connected to the heat exchanger (8).

4. The solid catalyst drying and pulverizing device according to claim 1, characterized in that: The filter (4) is provided with a filter plate (10) inside, and a filter solid phase discharge port (11) is provided on a vertical wall of the filter (4), the filter solid phase discharge port (11) is located above the filter plate (10), and a vacuum device is connected to the filter (4), and the connection between the vacuum device and the filter (4) is located below the filter plate (10).

5. The solid catalyst drying and pulverizing device according to claim 1, characterized in that: The filter (4) is connected to the ball mill (6) through a liquid phase filter outlet pipe (14) at the bottom, and a flushing water pipe (15) is connected to the liquid phase filter outlet pipe (14).

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