Small movable high-activity calcium-based desulfurizing agent preparation device

Abstract

The utility model relates to the technical field of flue gas desulfurization, and particularly provides a small movable high-activity calcium-based desulfurizing agent preparation device which comprises a feed port, a first-stage digester, a second-stage digester, a third-stage digester, an atomizing nozzle, a liquid injection port, a spraying control system, a double-shaft spiral propelling rod, a heating layer, an oil injection port, a temperature control device, a discharge port and the like. The feeding hole is positioned above the inlet of the first-stage digester; the first-stage digester, the second-stage digester and the third-stage digester are sequentially arranged from top to bottom; an upper-stage outlet is connected with a lower-stage inlet; atomizing nozzles are assembled at the tops of the first-stage digester and the second-stage digester and are connected with a liquid injection opening and a spraying control system; a double-shaft spiral propelling rod is mounted in the center of a cavity of the digester; heating layers are arranged on the two sides and the bottom of a stirring tank of the digester and are connected with an oil injection port and a temperature control device; and the discharge hole is positioned below the outlet of the third-stage digester. The utility model solves the problem of large occupied area of production equipment in the existing quicklime digestion technology, and meets the requirements of various factories on small-batch preparation of calcium-based desulfurizers anytime and anywhere.

Description

Technical Field

[0001] The utility model relates to the technical field of calcium-based desulfurizing agent production, in particular to a small-scale mobile high-activity calcium-based desulfurizing agent preparation device. Background Art

[0002] As my country's requirements for industrial flue gas emissions become increasingly stringent, sulfur dioxide gas produced in the steel industry urgently needs appropriate process treatment. Since the sulfur content in the low-temperature sulfur-containing flue gas from the steel plant heating furnace and the light rail workshop is low, the economic efficiency of using a wet desulfurization process is poor. The dry desulfurization process has the advantages of low construction cost, stable operation, and low cost, making it the first choice for desulfurization under this condition. The dry fixed bed desulfurization technology is mature in application and stable in operation. It is favored by the industry in factories because of its small footprint and simple equipment modification. The raw materials of calcium-based desulfurizers are widely available, and compared with traditional sodium bicarbonate desulfurizers, they have the advantages of low cost and easy handling of by-products. Therefore, the preparation of highly active calcium-based desulfurizers has gradually become the focus of industry attention.

[0003] This technology aims at the needs of factories to use a small amount of desulfurizer for flue gas desulfurization tests, and provides a small mobile high-activity calcium-based desulfurizer preparation device to meet the needs of various factories to prepare calcium-based desulfurizers in small batches anytime and anywhere. The equipment can simulate the pharmaceutical process of large-scale three-stage digestion equipment, save operating costs, and is simple, convenient and fast to operate. Summary of the invention

[0004] The utility model provides a small mobile high-activity calcium-based desulfurizing agent preparation device, which aims to provide a device for quickly and conveniently preparing a small batch of calcium-based desulfurizing agent required for a test in response to the needs of the background technology.

[0005] To this end, the utility model provides a small mobile high-activity calcium-based desulfurization agent preparation device, including a first-stage digester, a second-stage digester, a third-stage digester, an atomizing nozzle, a liquid injection port, a double-axis spiral propulsion rod, a heating layer, a temperature control device, a spraying device, a feed port, a discharge port, a bracket, and a universal wheel. The quicklime raw material enters the first-stage digester through the feed port, and is sent from the starting end of the digester to the end direction under the stirring of the double-axis spiral propulsion rod, and fully reacts with the first-stage digestion liquid sprayed by the atomizing nozzle during the process; after the material falls into the starting end of the second-stage digester, the material is stirred and pushed to the end direction of the second-stage digester by the double-axis spiral propulsion rod, and fully reacts with the second-stage digestion liquid sprayed by the atomizing nozzle during the process; after the material falls into the starting section of the third-stage digester, the material is stirred and pushed to the end of the third-stage digester by the double-axis spiral propulsion rod, and at this stage, the reactant is fully matured to obtain a fluffy desulfurization agent powder; the ball valve at the discharge port is opened, and the powder is collected to obtain an industrial calcium-based desulfurization agent finished product.

[0006] Preferably, the first-stage digester, the second-stage digester, and the third-stage digester are stacked vertically and connected end to end, the stirring shafts of each layer run in opposite directions, and the stirring shafts are parallel double-axis design to increase the stirring intensity.

[0007] Preferably, a plurality of atomizing nozzles uniformly distributed laterally are installed on the top of the first-stage digester and the second-stage digester, the spray range and flow rate are controlled by the spray control system, the required digestion liquid is added from the injection port, and the mass ratio of the digestion liquid to the raw material is 1: (0.4-1). The first-stage digestion liquid is a chlorine-containing inorganic salt solution, and the inorganic salt is an inorganic chloride salt selected from calcium chloride, magnesium chloride, potassium chloride, and sodium chloride. The second-stage digestion liquid is an organic solvent solution, and the organic solvent is a mixture of one or more selected from diethylene glycol, 1,3-butanediol, urea, anhydrous ethanol, polyethylene glycol, and ethylene glycol.

[0008] Preferably, a double-axis spiral propulsion rod is installed in the center of the cavity of the first-stage digester, the second-stage digester, and the third-stage digester, and the bottom arc-shaped heating layer fits the stirring range of the paddle blades of the double-axis spiral propulsion rod. The digestion reaction time is controlled by the motor speed, and the reaction time is 15 to 30 minutes.

[0009] Preferably, the first-stage digester uses a stirring blade with a regular shape, and the stirring blades used in the second-stage digester and the second-stage digester have different stirring intensities.

[0010] Preferably, an arc-shaped heating layer is arranged at the bottom and left and right sides of the stirring tank of the three-stage dry digester, and the temperature control device can set the temperature of the first-stage digester, the second-stage digester and the third-stage digester in stages. The heat transfer oil in the interlayer of the heating layer is added through the oil filling port, and the temperature can be adjusted in the range of 30 to 150°C.

[0011] Preferably, the discharge port is located below the end of the third-stage digester and is opened and closed by a ball valve.

[0012] Preferably, the moving direction of the device is controlled by universal wheels at the bottom of four brackets.

[0013] Beneficial effects of the utility model:

[0014] 1. The small mobile high-activity calcium-based desulfurizer preparation device provided by the utility model is assembled through the first-stage digester, the second-stage digester, the third-stage digester, the spray head, the liquid injection port, the double-axis spiral propulsion rod, the heating layer, the temperature control device, the spray device, the feed port, the discharge port, the bracket, and the universal wheel to meet the market demand for preparing small batches of calcium-based desulfurizers as test agents. Use industrial quicklime powder produced from a rotary kiln to prepare slaked lime (attached Figure 1), according to the actual working conditions, a highly active calcium-based desulfurizer with high sulfur capacity, long penetration time and high desulfurization efficiency suitable for sulfur-containing flue gas in steel plant heating furnaces and light rail workshops was prepared, and the desulfurization ability of the desulfurizer was verified in a fixed bed desulfurization experimental device (see Appendix Figure 4 ).

[0015] 2. The small mobile high-activity calcium-based desulfurizer preparation device provided by the utility model can control the spraying conditions of the digestion liquid in the first-stage digester and the second-stage digester respectively through the spraying device, and add different types of digestion liquid to meet the needs of efficient digestion of quicklime. The use of one or more low-cost inorganic additives increases the surface tension of slaked lime, enhances its fluidity and dispersibility, and provides the conditions for obtaining fluffy powder in the slaking stage. At the same time, the surface active components are increased in combination with slaked lime, the specific surface area and desulfurization activity of slaked lime are increased, the effective desulfurization time and maximum sulfur capacity of the desulfurizer under working conditions are enhanced, and the cost of reagent investment is effectively reduced.

[0016] 3. The small mobile high-activity calcium-based desulfurizer preparation device provided by the utility model can independently control the heating temperatures of the first-stage digester, the second-stage digester and the third-stage digester by a temperature control device, thereby helping the reaction process in the digester to achieve the best effect.

[0017] 4. The small mobile high-activity calcium-based desulfurization agent preparation device provided by the utility model has a stirring paddle with different blade shapes from the first digestion stage and the second and third digestion stages (attached Figure 3 ), the first stage digester uses full fan blades to achieve uniform mixing of materials and most digestion. The second and third stage digesters use irregularly shaped stirring blades to make the materials mix more vigorously and ensure that the digestion reaction is completely completed.

[0018] 5. The small mobile high-activity calcium-based desulfurizer preparation device provided by the utility model is equipped with 4 universal wheels at the bottom of the bracket, which is convenient for moving the equipment and meets various placement needs, and meets the needs of conveniently preparing small batches of calcium-based desulfurizers for experiments on industrial sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart for the preparation of a highly active calcium-based desulfurizer;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of a small mobile high-activity calcium-based desulfurization agent preparation device;

[0021] Figure 3 It is a cross-sectional schematic diagram of a small mobile high-activity calcium-based desulfurizer preparation device;

[0022] Figure 4 This is a flow chart for fixed bed desulfurization reaction test;

[0023] Explanation of the reference numerals in the accompanying drawings: 1. feed port; 2. first-stage digester; 3. second-stage digester; 4. third-stage digester; 5. atomizing nozzle; 6. liquid injection port; 7. spray control system; 8. double-axis spiral propulsion rod; 9. heating layer; 10. oil injection port; 11. temperature control device; 12. discharge port; 13. ball valve; 14. bracket; 15. universal wheel. DETAILED DESCRIPTION

[0024] Example 1

[0025] like Figure 1 , 2 As shown, the utility model provides a small mobile high-activity calcium-based desulfurizer preparation device, which is used to digest the industrial quicklime powder of the rotary kiln to prepare the high-activity calcium-based desulfurizer powder, specifically: weigh quicklime and aluminum hydroxide powder and add them into the small mobile high-activity calcium-based desulfurizer preparation device at a set feeding rate. Among them, the mass ratio of quicklime to aluminum hydroxide is 1:0.1. The spiral propulsion rod in the first-stage digester rotates evenly at a given rate, and the materials are evenly mixed under the stirring of the stirring blades. At the same time, the first-stage digestion liquid (4wt.% calcium chloride solution) is introduced, and the first-stage digestion liquid sprayed by the atomizing nozzle is fully contacted and reacted with the mixture. The digestate reacts in the first-stage digester for 10 minutes and then is pushed into the second-stage digester. The mass ratio of the digestion liquid to the powder is controlled to be 1:1 by the spraying device, and the temperature of the digestion liquid is 60°C. A heating layer is provided at the bottom and both sides of the first-stage digester, and the temperature is set to 100°C by the temperature control device.

[0026] The spiral propeller in the second-stage digester rotates evenly at a given speed, and the digestate is stirred by the irregular stirring blades (attached Figure 3 ) is stirred more vigorously, and the secondary digestion liquid (2wt.% urea solution) is introduced at the same time. The secondary digestion liquid sprayed by the atomizing nozzle contacts the digestate evenly, and further digestion reaction occurs. The digestate reacts in the second-stage digester for 10 minutes and is pushed into the third-stage digester. The mass ratio of the digestion liquid to the powder is controlled to be 1:1 by the spray device, and the temperature of the digestion liquid is 60°C. A heating layer is provided at the bottom and both sides of the second-stage digester, and the temperature is set to 100°C by the temperature control device.

[0027] The double-axis spiral propeller in the third-stage digester rotates evenly at a given speed, and the digestate is stirred by the irregular stirring blades (attached Figure 3 ) and stirred vigorously for maturation. After 20 minutes of stay, the digestate is pushed out of the third-stage digester. A heating layer is provided at the bottom and both sides of the third-stage digester, and the temperature is set to 100°C by a temperature control device.

[0028] Open the ball valve at the discharge port, collect the finished product of high-activity calcium-based desulfurizer, and perform performance testing on the fixed-bed desulfurization reaction device (see Appendix Figure 4). Set the drug loading amount to 0.25g and the sulfur dioxide concentration to 120mg / m 3 , reaction temperature is 100℃, oxygen content is 5%, and total gas flow rate is 1L / min. The penetration efficiency is set to half of the maximum desulfurization efficiency. The experimental results show that the desulfurization efficiency of the highly active calcium-based desulfurizer is 100%, the penetration time is 80min, and the penetration sulfur capacity is 34.13mg / g. The penetration sulfur capacity is about 42 times that of industrial quicklime (0.81mg / g). BET test results show that the specific surface area of ​​the desulfurizer is as high as 22.1003m 2 / g, pore volume is 0.0964cm 3 / g, and the average pore size is 12.6962nm.

[0029] Example 2

[0030] The utility model provides a small mobile high-activity calcium-based desulfurizer preparation device, which is used to digest the industrial quicklime powder of the rotary kiln to prepare the high-activity calcium-based desulfurizer powder, specifically: weigh quicklime and ferric oxide powder and add them into the small mobile high-activity calcium-based desulfurizer preparation device at a set feeding rate. Among them, the mass ratio of quicklime to ferric oxide is 1:0.1. The double-axis spiral propulsion rod in the first-stage digester rotates uniformly at a given rate, and the materials are uniformly mixed under the stirring of the stirring blades. At the same time, the first-stage digestion liquid is introduced, and the first-stage digestion liquid (2wt.% calcium chloride solution) sprayed by the atomizing nozzle is fully contacted and reacted with the mixture. The digestate reacts in the first-stage digester for 15 minutes and then is pushed into the second-stage digester. The mass ratio of the digestion liquid to the powder is controlled to be 1:0.4 by the spraying device, and the temperature of the digestion liquid is 25°C. A heating layer is provided at the bottom and both sides of the first-stage digester, and the temperature is set to 50°C by the temperature control device.

[0031] The double-axis screw propeller in the second-stage digester rotates evenly at a given speed, and the digestate is stirred by the irregular stirring blades (attached Figure 3 ) is stirred more vigorously, and the secondary digestion liquid (2wt.% 1,3-butanediol) is introduced at the same time. The secondary digestion liquid sprayed by the atomizing nozzle contacts the digestate evenly, and further digestion reaction occurs. The digestate reacts in the second-stage digester for 15 minutes and is pushed into the third-stage digester. The mass ratio of the digestion liquid to the powder is controlled to be 1:0.4 by the spray device, and the temperature of the digestion liquid is 25°C. A heating layer is provided at the bottom and both sides of the second-stage digester, and the temperature is set to 50°C by the temperature control device.

[0032] The double-axis screw propeller in the third-stage digester rotates evenly at a given speed, and the digestate is stirred by the irregular stirring blades (attached Figure 3) and stirred vigorously for maturation. After staying for 25 minutes, the digestate is pushed out of the third-stage digester. A heating layer is provided at the bottom and both sides of the third-stage digester, and the temperature is set to 80°C by a temperature control device.

[0033] Open the ball valve at the discharge port, collect the finished product of high-activity calcium-based desulfurizer, and perform performance testing on the fixed-bed desulfurization reaction device. Set the drug loading amount to 0.6g and the sulfur dioxide concentration to 500mg / m 3 , reaction temperature is 100℃, oxygen content is 5%, and total gas flow rate is 1L / min. The penetration efficiency is set to half of the maximum desulfurization efficiency. The experimental results show that the desulfurization efficiency of the highly active calcium-based desulfurizer is 100%, the penetration time is 55min, and the penetration sulfur capacity is 37.24mg / g. The penetration sulfur capacity is about 46 times that of industrial quicklime sulfur capacity (0.81mg / g). BET test results show that the specific surface area of ​​the desulfurizer is as high as 19.6080m 2 / g, pore volume is 0.1250cm 3 / g, and the average pore size is 26.4327nm.

[0034] Example 3

[0035] The utility model provides a small mobile high-activity calcium-based desulfurizer preparation device, which is used to digest the industrial quicklime powder of the rotary kiln to prepare the high-activity calcium-based desulfurizer powder, specifically: weigh quicklime and ferric oxide powder and add them into the small mobile high-activity calcium-based desulfurizer preparation device at a set feeding rate. Among them, the mass ratio of quicklime to magnesium oxide is 1:0.05. The double-axis spiral propulsion rod in the first-stage digester rotates uniformly at a given rate, and the materials are uniformly mixed under the stirring of the stirring blades. At the same time, the first-stage digestion liquid is introduced, and the first-stage digestion liquid (2wt.% calcium chloride solution) sprayed by the atomizing nozzle is fully contacted and reacted with the mixture. The digestate reacts in the first-stage digester for 10 minutes and then is pushed into the second-stage digester. The mass ratio of the digestion liquid to the powder is controlled to be 1:0.8 by the spraying device, and the temperature of the digestion liquid is 60°C. A heating layer is provided at the bottom and both sides of the first-stage digester, and the temperature is set to 50°C by the temperature control device.

[0036] The double-axis screw propeller in the second-stage digester rotates evenly at a given speed, and the digestate is stirred by the irregular stirring blades (attached Figure 3) is stirred more vigorously, and the secondary digestion liquid (2wt.% sodium hydroxide solution and 2wt.% urea solution) is introduced at the same time. The secondary digestion liquid sprayed by the atomizing nozzle contacts the digestate evenly, and further digestion reaction occurs. The digestate reacts in the second-stage digester for 10 minutes and is pushed into the third-stage digester. The mass ratio of the digestion liquid to the powder is controlled to be 1:0.5 by the spray device, and the temperature of the digestion liquid is 60°C. A heating layer is provided at the bottom and both sides of the second-stage digester, and the temperature is set to 50°C by the temperature control device.

[0037] The double-axis spiral propeller in the third-stage digester rotates evenly at a given speed, and the digestate is stirred by the irregular stirring blades (attached Figure 3 ) and stirred vigorously for maturation. After 30 minutes of stay, the digestate is pushed out of the third-stage digester. A heating layer is provided at the bottom and both sides of the third-stage digester, and the temperature is set to 80°C by a temperature control device.

[0038] Open the ball valve at the discharge port, collect the finished product of high-activity calcium-based desulfurizer, and perform performance testing on the fixed-bed desulfurization reaction device. Set the drug loading amount to 0.3g and the sulfur dioxide concentration to 200mg / m 3 , reaction temperature is 100℃, oxygen content is 5%, and total gas flow rate is 1L / min. The penetration efficiency is set to half of the maximum desulfurization efficiency. The experimental results show that the desulfurization efficiency of the highly active calcium-based desulfurizer is 95.89%, the penetration time is 36min, and the penetration sulfur capacity is 16.21mg / g. The penetration sulfur capacity is about 20 times that of industrial quicklime sulfur capacity (0.81mg / g). BET test results show that the specific surface area of ​​the desulfurizer is as high as 23.5740m 2 / g, pore volume is 0.1319cm 3 / g, and the average pore size is 23.4880nm.

[0039] Example 4

[0040] The secondary digestion liquid used in Example 1 was replaced with a 5wt.% urea solution to prepare a desulfurization agent sample. The drug loading was set to 0.5g and the sulfur dioxide concentration was 120mg / m 3 , reaction temperature is 100℃, oxygen content is 5%, and total gas flow rate is 1L / min. The penetration efficiency is set to half of the maximum desulfurization efficiency. The experimental results show that the desulfurization efficiency of the highly active calcium-based desulfurizer is 100%, the penetration time is 63min, and the penetration sulfur capacity is 17.36mg / g. The penetration sulfur capacity is about 21 times that of industrial quicklime (0.81mg / g). The BET test results show that the specific surface area of ​​the desulfurizer is as high as 20.7938m 2 / g, pore volume is 0.1154cm 3 / g, and the average pore size is 16.8155nm.

[0041] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A small mobile high-activity calcium-based desulfurization agent preparation device, characterized in that: It comprises a feed port (1), a first-stage digester (2), a second-stage digester (3), a third-stage digester (4), an atomizing nozzle (5), a liquid injection port (6), a spray control system (7), a double-axis spiral propulsion rod (8), a heating layer (9), an oil injection port (10), a temperature control device (11), a discharge port (12), a ball valve (13), a bracket (14), and a universal wheel (15); The first-stage digester (2), the second-stage digester (3), and the third-stage digester (4) are stacked vertically and connected end to end. The stirring shafts of each layer run in opposite directions, and the stirring shafts are designed as parallel double shafts to increase the stirring intensity. A plurality of atomizing nozzles (5) evenly distributed laterally are installed on the top of the first-stage digester (2) and the second-stage digester (3). The spraying range and flow rate are controlled by the spraying control system (7), and the required digesting liquid is added from the injection port (6); The centers of the cavities of the first-stage digester (2), the second-stage digester (3), and the third-stage digester (4) are equipped with frequency-converting double-axis spiral propulsion rods (8), the arc-shaped heating layer (9) at the bottom fits the stirring range of the paddles of the double-axis spiral propulsion rods (8), and the digestion reaction time is controlled by the motor speed; The bottom and left and right sides of the third-stage digester stirring tank are provided with an arc-shaped heating layer (9); the temperature control device (11) can set the temperature of the first-stage digester (2), the second-stage digester (3), and the third-stage digester (4) in stages; the heat transfer oil in the interlayer of the heating layer (9) is added through the oil injection port (10), and the temperature is adjustable.

Images