System for drying potash fertilizer by adopting gas coupled steam

Abstract

The utility model relates to a system for drying potash fertilizer by adopting gas coupled steam, which comprises a drying machine (1), a hot air device (2) and a dust removal device (3), the drying machine is provided with a feed port (12), a first steam inlet (152), a hot air inlet (162) and a waste gas outlet, and a steam heating pipe is arranged in a drying cavity and is respectively communicated with the first steam inlet and a condensate water outlet. The gas heating furnace is provided with a gas inlet (44) and a hot air outlet (46). And the first fan is communicated with the air inlet. The first hot air pipe communicates with the hot air outlet and the hot air inlet. And a second steam inlet (531) and a hot air outlet pipe (545) are arranged on the steam heater. The second fan communicates with the air inlet pipe, and the second hot air pipe communicates with the hot air outlet pipe and the hot air inlet. The dust removal device (3) is communicated with the waste gas outlet. The drying device can improve the drying efficiency of the wet potash fertilizer and improve the production efficiency.

Description

Technical Field

[0001] The utility model relates to a potash fertilizer drying system, and more specifically to a structure of a system for drying potash fertilizer by coupling gas with steam. Background Art

[0002] Salt lake brine is rich in minerals such as sodium chloride, potash fertilizer and magnesium chloride, and is the main raw material for producing potash fertilizer. In the process of producing potash fertilizer in salt lakes, the raw materials are sequentially concentrated, slurry adjusted, flotation, low sodium concentration, cold crystallization, crude potassium screening, crude potassium concentration and refined potassium washing to obtain potash fertilizer wet material, which is then packaged by a drying system, cooling system and packaging system to obtain the product.

[0003] The existing method usually uses a dryer to dry the wet potash fertilizer. A drying chamber for accommodating the wet potash fertilizer is formed inside the dryer. A gas-fired heating furnace is used to heat the air with natural gas as fuel and blow it into the drying chamber. The hot air dries the wet potash fertilizer in the dryer and takes away the moisture in the drying furnace. However, due to the restriction of natural gas use by enterprises in winter to protect people's livelihood, hot air cannot be supplied normally, making it impossible to dry the wet potash fertilizer, affecting the normal production of potash fertilizer, reducing the production efficiency and output of potash fertilizer, and causing serious impact on the normal production and economic benefits of potash fertilizer production enterprises.

[0004] In addition, a large amount of waste gas will be generated when potassium fertilizer is dried. The waste gas contains a large amount of potassium chloride dust. The waste gas diffuses into the atmosphere, causing a high loss rate of potassium fertilizer, polluting the environment, and affecting the health of workers.

[0005] The utility model aims to solve the problems in the existing potash fertilizer production process that the drying of potash fertilizer wet material is greatly affected by the gas supply, and the waste gas emission causes a high potash fertilizer loss rate and pollutes the environment. Utility Model Content

[0006] In order to solve the above problems, the utility model provides a system for drying potash fertilizer by coupling gas with steam, including a dryer 1, a hot air device 2 and a dust removal device 3. The dryer 1 is provided with a feed port 12, a discharge port 141, a first steam inlet 152, a condensate outlet 153, a hot air inlet 13 and an exhaust gas outlet 144, and a drying chamber 111 is formed inside. A steam heating pipe 151 is provided in the drying chamber 111, and the steam heating pipe 151 is connected to the first steam inlet 152 and the condensate outlet 153 respectively. The first steam inlet 152 is used to be connected to the steam pipeline. The hot air device 2 includes a gas heating furnace 4, a first fan 41, a first hot air pipe 42, a steam heater 5, a second fan 51 and a second hot air pipe 52. The gas heating furnace 4 is provided with a gas inlet 44, an air inlet 45 and a hot air outlet 46.

[0007] The gas inlet 44 is used to communicate with the gas pipeline, and the first fan 41 is connected to the air inlet 45. The first hot air pipe 42 is connected to the hot air outlet 46 and the hot air inlet 13 respectively, and the first hot air pipe 42 is provided with a first hot air valve 421. The steam heater 5 is provided with a second steam inlet 531, an air inlet pipe 544 and a hot air outlet pipe 545, and the second steam inlet 531 is used to communicate with the steam pipeline. The second fan 51 is connected to the air inlet pipe 544, and the two ends of the second hot air pipe 52 are connected to the hot air outlet pipe 545 and the hot air inlet 13 respectively, and the second hot air pipe 52 is provided with a second hot air valve 521. The dust removal device 3 is connected to the exhaust gas outlet 144 through the exhaust gas pipe 34, and is used to treat the exhaust gas.

[0008] When the utility model is used, when the gas is not restricted, the gas inlet 44 on the gas heating furnace 4 is connected to the gas pipeline, the first fan 41 and the gas heating furnace 4 are turned on, and the air enters the gas heating furnace 4 to form hot air after being heated. The hot air enters the drying chamber 111 through the first hot air pipe 42, and the first steam inlet 152 is connected to the steam pipeline, and the steam enters the steam heating pipe 151 to heat the drying chamber 111. Then, the feed port 12 is connected to the potassium fertilizer wet material conveyor belt, and the potassium fertilizer wet material enters the drying chamber 111 from the feed port 12. Under the action of the high temperature in the drying chamber 111, the moisture in the potassium fertilizer wet material evaporates, and the flow of hot air promotes the rapid evaporation of the moisture in the potassium fertilizer wet material. The hot air carries the potassium fertilizer dust and water vapor as waste gas and is discharged from the waste gas outlet 144 into the dust removal device 3 for treatment and then discharged. The steam condenses in the steam heating pipe 151 and is discharged from the condensed water outlet 153. The dried potassium fertilizer is discharged from the discharge port 141.

[0009] When gas is limited, the second steam inlet 531 is connected to the steam pipeline, the second fan 51 is turned on, and air enters the steam heater 5 through the air inlet pipe 544. After being heated by steam, hot air is formed. The hot air enters the drying chamber 111 through the second hot air pipe 52 to continue drying the wet potash fertilizer.

[0010] The utility model is provided with a gas heating furnace 4 and a steam heater 5, the gas heating furnace 4 is connected to the hot air inlet 13 of the dryer 1 through the first hot air pipe 42, and the steam heater 5 is connected to the hot air inlet 13 of the dryer 1 through the second hot air pipe 52. When the gas is not limited, the hot air generated by the gas heating furnace 4 is used to enter the drying chamber 111 to heat the potash fertilizer wet material in the drying chamber 111. When the natural gas supply is limited, the air is heated by steam to provide hot air to dry the potash fertilizer wet material. When the potash fertilizer output is large, the gas heating furnace 4 and the steam heater 5 can also be used to supply hot air at the same time to improve the drying efficiency. By combining the two heating methods of steam and natural gas to provide hot air, the drying efficiency of the potash fertilizer wet material can be improved, thereby improving the potash fertilizer production efficiency, and solving the problem that the existing potash fertilizer production process is greatly affected by the gas supply.

[0011] Preferably, the steam heater 5 comprises an outer shell 53, an inner shell 54 and a heat exchange tube 55, and the outer shell 53 is provided with a second steam inlet 531 and a second steam outlet 532. The inner shell 54 is fixedly arranged inside the outer shell 53, and a heat exchange cavity 541 is formed inside the inner shell 54. The inner shell 54 is provided with a third steam inlet 542, a third steam outlet 543, and an air inlet pipe 544 and a hot air outlet pipe 545 communicating with the heat exchange cavity 541. A heating cavity 533 is formed between the inner shell 54 and the outer shell 53, and one end of the air inlet pipe 544 and the hot air outlet pipe 545 away from the inner shell 54 passes through the outer shell 53 and extends to the outside of the outer shell 53. The heat exchange tube 55 is arranged in the heat exchange cavity 541, and the two ends are respectively communicated with the third steam inlet 542 and the third steam outlet 543.

[0012] When the steam heater 5 is in use, the second steam inlet 531 is connected to the steam pipe, and the second fan 51 is turned on, and the air enters the heat exchange chamber 541 from the air inlet pipe 544, and the steam in the steam pipe enters the heating chamber 533 through the second steam inlet 531, and the air in the heat exchange chamber 541 is heated from the outside of the heat exchange chamber 541. The steam in the heating chamber 533 continuously enters the heat exchange pipe 55, and the air in the heating chamber 533 is simultaneously heated from the inside of the heat exchange chamber 541. The steam after heat exchange flows to the second steam outlet 532 for discharge, and the heated air forms hot air and enters the drying chamber through the second hot air pipe 52.

[0013] The steam heater 5 includes an inner shell 54 and an outer shell 53. The inner shell 54 is fixedly arranged inside the outer shell 53, and a heating chamber 533 is formed between the outer shell 53 and the inner shell 54. A heat exchange chamber 541 is arranged inside the inner shell 54. A heat exchange tube 55 connected to the heating chamber 533 is arranged inside the heat exchange chamber 541. The air in the heat exchange chamber 541 is heated from the outside of the heat exchange chamber 541 by the steam in the heating chamber 533, and the air in the heat exchange chamber 541 is heated from the inside of the heat exchange chamber 541 by the steam in the heat exchange tube 55. The air is heated at the same time, which can improve the heating efficiency of the air.

[0014] Preferably, the dust removal device 3 comprises a box body 31, a partition 32 and a filter bag 33. The side wall of the box body 31 is provided with an exhaust gas inlet 311 and an exhaust gas outlet 312, and the bottom plate 313 of the box body 31 is provided with a discharge port 314. The partition 32 is horizontally arranged in the box body 31, and the interior of the box body 31 is divided into a disposal chamber 316 located at the lower part of the box body 31 and a bag chamber 315 located at the upper part of the box body 31. The partition 32 is provided with a plurality of through holes 321 connecting the bag chamber 315 and the disposal chamber 316. The treatment chamber 316 is connected to the exhaust gas inlet 311 and the discharge port 314, the bag chamber 315 is connected to the exhaust gas outlet 312, the filter bag 33 is arranged in the bag chamber 315, one end of the filter bag 33 is open and the other end is closed, the closed end of the filter bag 33 is fixed to the top of the bag chamber 315, and the open end is fixed to the through hole 321 on the partition 32, and the interior of the filter bag 33 is connected to the treatment chamber 316.

[0015] The dust removal device 3 includes a box body 31, a partition 32 and a filter bag 33. The interior of the box body 31 is divided into a treatment chamber 316 and a bag chamber 315 by the partition 32. The treatment chamber 316 is connected to the exhaust gas inlet 311, and the bag chamber 315 is connected to the exhaust gas outlet 312. The filter bag 33 is arranged in the bag chamber 315, and the open end is installed at the through hole 321 on the partition 32. After the flue gas entering the treatment chamber 316 through the exhaust gas inlet 311 enters the filter bag 33, the clean flue gas passes through the filter bag 33 and enters the bag chamber 315 and is discharged from the exhaust gas outlet 312. The dust in the flue gas is blocked by the filter bag 33 and falls from the filter bag 33 to the discharge port 143 at the bottom of the box body 31, and is recovered after being discharged regularly.

[0016] Preferably, the closed end of the filter bag 33 is suspended on the top of the box body 31 by a spring 35. The closed end of the filter bag 33 is suspended on the top of the box body 31 by a spring 35. The spring 35 can support the filter bag 33, keep the filter bag 33 at a moderate tightness, prevent the filter bag 33 from being damaged when the filter bag 33 is subjected to excessive force, and increase the vibration of the filter bag 33 to promote the dust on the filter bag 33 to fall.

[0017] Preferably, the top of the spring 35 is fixedly connected to the top of the box body 31 through the vibrator 36. By setting the top of the spring 35 to be fixedly connected to the top of the box body 31 through the vibrator 36, when too much dust adheres to the filter bag 33, the vibrator 36 can control the spring 35 to drive the filter bag 33 to vibrate, thereby shaking off the dust on the filter bag 33, preventing the dust on the filter bag 33 from clogging the filter bag 33 and affecting the normal operation of the dust removal device 3.

[0018] Preferably, an induced draft fan 37 and a back-blowing fan 38 are further included, and a back-blowing port 317 communicating with the bag chamber 315 is provided on the side wall of the box body 31, the induced draft fan 37 is communicated with the exhaust gas outlet 312, and the back-blowing fan 38 is communicated with the back-blowing port 317 through a back-blowing pipe 381. By providing the back-blowing port 317 communicating with the bag chamber 315 on the box body 31, when the filter holes on the filter bag 33 are clogged with dust, the filter bag 33 can be back-blown with high-pressure air to blow away the dust on the filter bag 33, so that the filter bag 33 can continue to filter.

[0019] Preferably, a third hot air pipe 57 is further included, and both ends of the third hot air pipe 57 are respectively connected to the hot air outlet pipe 545 and the exhaust pipe 34, and a third hot air valve is provided on the third hot air pipe 57. Since the exhaust gas has high humidity and low dew point, it is easy to condense and clog the filter bag 33 after it enters the dust removal device 3 and contacts with the air for cooling, which affects the waste gas treatment. After the hot air is mixed with the waste gas and enters the dust removal device 3, the dew point temperature of the waste gas can be increased, and the adhesion and clogging of the filter bag can be reduced.

[0020] Preferably, a first air filter 43 is provided at the air inlet of the first fan 41, and a second air filter 56 is provided at the air inlet of the second fan 51. The solid impurities in the air can be filtered through the filter, so that the air entering the fan is clean, and impurities are prevented from entering the potash fertilizer.

[0021] Preferably, a material return device 7 is further included, the discharge port 141 includes a discharge port 143 and a material return port 142 , and the material return device 7 is connected to the material return port 142 and the feed port 12 respectively.

[0022] Preferably, a steam condensate tank 6 is further included, and the steam condensate tank 6 is communicated with the condensed water outlet 153. The steam condensate tank 6 can be used to recover steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 . A schematic diagram of a system connection structure for drying potash fertilizer using gas coupled steam;

[0024] Figure 2 .Sketch of the internal structure of the steam heater;

[0025] Figure 3 .Schematic diagram of the external structure of the dryer;

[0026] Figure 4 . Schematic diagram of the internal structure of the dryer;

[0027] Figure 5 .Schematic diagram of the external structure of the dust removal device;

[0028] Figure 6 .Schematic diagram of the internal structure of the dust removal device.

[0029] In the figure, 1. dryer, 11. cylinder, 111. drying chamber, 112. stirring member, 12. feed port, 13. hot air inlet, 14. discharge box, 141. discharge port, 142. return port, 143. feed port, 144. exhaust gas outlet, 15. steam chamber, 151. steam heating pipe, 152. first steam inlet, 153. condensate outlet, 16. bracket, 161. base, 162. motor, 163. support ring, 2. hot air device, 3. dust removal device, 31. box, 311. exhaust gas inlet, 312. tail gas outlet, 313. bottom plate, 314. discharge port, 315. bag chamber, 316. disposal chamber, 317. backflush port, 32. partition, 321. through hole, 33. filter bag, 34. exhaust gas pipeline, 35. spring, 36. vibrator, 37. . Induced draft fan, 38. Back blower, 381. Back blow pipe, 382. Back blow valve, 4. Gas heating furnace, 41. First fan, 42. First hot air pipe, 421. First hot air valve, 43. First air filter, 44. Gas inlet, 45. Air inlet, 46. Hot air outlet, 5. Steam heater, 51. Second fan, 52. Second hot air pipe, 521. Second hot air valve, 53. Outer shell, 531. Second steam inlet, 532. Second steam outlet, 533. Heating chamber, 54. Inner shell, 541. Heat exchange chamber, 542. Third steam inlet, 543. Third steam outlet, 544. Air inlet pipe, 545. Hot air outlet pipe, 55. Heat exchange pipe, 56. Second air filter, 57. Third hot air pipe, 6. Steam condensate tank, 7. Return device. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, a system for drying potash fertilizer using gas coupled with steam includes a dryer 1, a hot air device 2 and a dust removal device 3. The dryer 1 is provided with a feed inlet 12, a discharge port 141, a first steam inlet 152, a condensed water outlet 153, a hot air inlet 13 and an exhaust gas outlet 144.

[0032] The hot air device 2 comprises a gas heating furnace 4, a first fan 41, a first hot air pipe 42, a steam heater 5, a second fan 51, a second hot air pipe 52 and a third hot air pipe 57. The gas heating furnace 4 is provided with a gas inlet 44, an air inlet 45 and a hot air outlet 46.

[0033] The gas inlet 44 is used to communicate with the gas pipeline to heat the air in the gas heating furnace 4 by burning natural gas.

[0034] The first fan 41 is connected to the air inlet 45, and blows air into the gas heating furnace 4. After heating, hot air is formed and discharged from the hot air outlet 46 into the first hot air pipe 42. A first air filter 43 is provided at the air inlet of the first fan 41.

[0035] The first hot air pipe 42 is connected to the hot air outlet 46 and the hot air inlet 13 respectively. The first hot air pipe 42 conveys the hot air generated by the gas heating furnace 4 to the dryer 1 . The first hot air pipe 42 is provided with a first hot air valve 421 .

[0036] like Figure 1 and Figure 2 As shown, the steam heater 5 includes an outer shell 53, an inner shell 54 and a heat exchange tube 55. The upper portion of the outer shell 53 is provided with a second steam inlet 531, and the lower portion is provided with a second steam outlet 532.

[0037] The inner shell 54 is fixedly arranged inside the outer shell 53, and a heat exchange cavity 541 is formed inside the inner shell 54. A third steam inlet 542 is arranged at the upper part of the inner shell 54, and a third steam outlet 543 is arranged at the lower part. An air inlet pipe 544 and a hot air outlet pipe 545 communicating with the heat exchange cavity 541 are arranged on the side wall. A heating cavity 533 is formed between the inner shell 54 and the outer shell 53, and the ends of the air inlet pipe 544 and the hot air outlet pipe 545 away from the inner shell 54 pass through the outer shell 53 and extend to the outside of the outer shell 53.

[0038] The heat exchange tube 55 is vertically arranged in the heat exchange cavity 541, and its two ends are respectively connected to the third steam inlet 542 and the third steam outlet 543. A plurality of heat exchange tubes 55 are arranged parallel to each other and at equal intervals, thereby increasing the heating speed of the air.

[0039] The second steam inlet 531 is used to communicate with the steam pipeline to allow steam to enter the heating chamber 533, and the second steam outlet 532 is used to discharge the steam and condensed water after heat exchange.

[0040] The second fan 51 is connected to the air inlet pipe 544, and the two ends of the second hot air pipe 52 are respectively connected to the hot air outlet pipe 545 and the hot air inlet 13, and the second hot air pipe 52 is provided with a second hot air valve 521. A second air filter 56 is provided at the air inlet of the second fan 51. The filter can filter solid impurities in the air, so that the air entering the fan is clean, and impurities in the potash fertilizer are prevented from entering.

[0041] When the steam heater 5 is working, air enters the heat exchange chamber 541 from the air inlet pipe 544, the steam in the steam pipe enters the heating chamber 533 through the second steam inlet 531, and the air in the heat exchange chamber 541 is heated from the outside of the heat exchange chamber 541. The steam in the heating chamber 533 continuously enters the heat exchange pipe 55, and the air in the heating chamber 533 is simultaneously heated from the inside of the heat exchange chamber 541. The steam after heat exchange flows to the second steam outlet 532 for discharge, and the heated air forms hot air and enters the drying chamber through the second hot air pipe 52.

[0042] Therefore, the steam in the heating chamber 533 heats the air in the heat exchange chamber 541 from the outside of the heat exchange chamber 541, and the steam in the heat exchange tube 55 heats the air in the heat exchange chamber 541 from the inside of the heat exchange chamber 541. At the same time, the air in the heat exchange chamber 541 is heated from both the inside and the outside, which can improve the heating efficiency of the air.

[0043] like Figure 1 , Figure 3 and Figure 4 As shown, the dryer 1 includes a cylinder 11, a discharge box 14, a steam chamber 15 and a bracket 16. The bracket 16 includes a base 161, a motor 162 fixedly arranged on the base 161, and a support ring 163. The motor 162 is fixedly arranged on the base and connected to the cylinder 11 through a gear to drive the cylinder 11 to rotate.

[0044] The support ring 163 is sleeved on the cylinder body 11 and is rotatably connected to the cylinder body 11 .

[0045] The front end of the cylinder 11 is provided with a feed inlet 12 and a hot air inlet 13, and a drying chamber 111 is formed inside, and a stirring member 112 is provided on the inner wall. A steam heating pipe 151 is provided in the drying chamber 111.

[0046] The discharge box 14 is fixedly arranged on the base, sleeved on the rear end of the cylinder 11, rotatably connected to the cylinder 11, and internally communicated. A discharge port 141 is arranged at the bottom of the discharge box 14, and an exhaust gas outlet 144 is arranged at the top.

[0047] The steam chamber 15 is fixedly arranged at the rear side of the discharge box 14 . A first steam inlet 152 and a condensed water outlet 153 are arranged at the rear side of the steam chamber 15 . The steam heating pipe 151 is fixedly connected to the steam chamber 15 and is communicated with the inside.

[0048] The steam heating pipe 151 is located at the rear side of the drying chamber 111 , and both ends of the steam heating pipe 151 are connected to the steam chamber 15 .

[0049] The feed inlet 12 of the dryer is used to be connected to a conveying device for the wet potassium fertilizer obtained by the refined potassium washing process, and the wet potassium fertilizer enters the drying chamber from the feed inlet 12 .

[0050] The first steam inlet 152 is used to communicate with the steam pipeline. The steam enters the steam heating pipe 151 through the first steam inlet 152 to heat the potash fertilizer wet material in the drying chamber to evaporate the water in the potash fertilizer wet material.

[0051] The condensed water outlet 153 is connected to the steam condensate tank 6 , and the steam in the steam heating pipe 151 is condensed and discharged from the condensed water outlet 153 into the steam condensate tank 6 for recycling.

[0052] The hot air inlet 13 is connected to the hot air device 2. The hot air generated by the hot air device 2 enters the drying chamber from the hot air inlet 13 to heat the wet potash fertilizer material, and is mixed with the water vapor and potash fertilizer powder generated by the evaporation of the wet potash fertilizer material to form waste gas, which is discharged from the waste gas outlet 144, thereby reducing the humidity in the drying chamber, promoting rapid evaporation of water in the wet potash fertilizer material, and accelerating the drying efficiency.

[0053] The dried material in the drying chamber is discharged from the discharge port 141, which includes a return port 142 and a discharge port 143. Rotary discharge valves are provided on the return port 142 and the discharge port 143. The dried potash fertilizer discharged from the discharge port 143 enters the next level process for packaging.

[0054] The dried potash fertilizer discharged from the return port 142 is returned to the feed port 12 through the return device 7, mixed with the potash fertilizer wet material and then enters the drying chamber, reducing the moisture content of the potash fertilizer wet material, thereby reducing the viscosity of the potash fertilizer wet material, preventing the potash fertilizer wet material from sticking, and improving the drying efficiency. The return device 7 can be a conveyor belt or the like.

[0055] When the dryer is in use, the front end of the barrel 11 of the dryer 1 is higher than the rear end, and a certain inclination is maintained. The potash fertilizer wet material enters the drying chamber 111 from the feed port 12, the hot air enters the drying chamber 111 from the hot air inlet 13, and the steam enters the steam chamber 15 from the first steam inlet 152, and is evenly distributed in each steam heating pipe 151. The potash fertilizer wet material is directly in contact with the hot air in the drying chamber 111 for pre-drying. The motor 162 is turned on to drive the barrel 11 to rotate. As the barrel 11 rotates, the potash fertilizer wet material is continuously broken up and turned over by the stirring element 112, and continuously moves to the rear end of the drying chamber 111. The pre-dried potash fertilizer wet material enters the rear section of the barrel 11, evenly enters between the steam heating pipes 151, and exchanges heat and dries with the steam in the steam heating pipes 151. As the barrel 11 rotates, the dried potash fertilizer material finally enters the discharge box 14 and is discharged from the discharge port 141.

[0056] The steam in the steam heating pipe exchanges heat with the potash fertilizer wet material and condenses into condensate, which flows back to the steam chamber 15 and is then discharged through the condensate outlet 153. The water vapor and dust generated during the drying process of the potash fertilizer wet material are mixed with the hot air to form waste gas and discharged from the waste gas outlet 144.

[0057] like Figure 5 and Figure 6 As shown, the dust removal device 3 includes a box body 31, a partition 32, a filter bag 33, an induced draft fan 37 and a back blowing fan 38, and an exhaust gas inlet 311, an exhaust gas outlet 144 and a back blowing port 317 are arranged on the side wall of the box body 31, and a discharge port 314 is arranged on the bottom plate 313 of the box body 31.

[0058] The exhaust gas inlet 311 is connected to the exhaust gas outlet 144 of the dryer 1 through the exhaust gas pipe 34. Figure 1 .

[0059] The partition 32 is horizontally arranged in the box body 31 to separate the interior of the box body 31 into a disposal chamber 316 located at the lower part of the box body 31 and a bag chamber 315 located at the upper part of the box body 31 . The partition 32 is provided with a plurality of through holes 321 connecting the bag chamber 315 and the disposal chamber 316 .

[0060] The disposal chamber 316 is connected to the waste gas inlet 311 and the discharge port 314, the bag chamber 315 is connected to the waste gas outlet 144 and the backblowing port 317, the filter bag 33 is arranged in the bag chamber 315, one end of the filter bag 33 is open and the other end is closed, the closed end of the filter bag 33 is fixed to the top of the bag chamber 315, and the open end is fixed to the through hole 321 on the partition 32, and the interior of the filter bag 33 is connected to the disposal chamber 316.

[0061] The closed end of the filter bag 33 is suspended on the top of the box body 31 by a spring 35. The closed end of the filter bag 33 is suspended on the top of the box body 31 by a spring 35. The spring 35 can support the filter bag 33, keep the filter bag 33 at a moderate tightness, prevent the filter bag 33 from being damaged when the filter bag 33 is subjected to excessive force, and increase the vibration of the filter bag 33 to promote the dust on the filter bag 33 to fall.

[0062] The top of the spring 35 is fixedly connected to the top of the box 31 through the vibrator 36. The spring 35 can be controlled by the vibrator 36 to drive the filter bag 33 to vibrate, so as to shake off the dust on the filter bag 33, so as to prevent the dust on the filter bag 33 from clogging the filter bag 33 and affecting the normal operation of the dust removal device 3.

[0063] The induced draft fan 37 is connected to the exhaust gas outlet 144 , and the induced draft fan 37 can promote the exhaust gas to pass through the filter bag 33 , thereby improving the exhaust gas treatment efficiency.

[0064] The blower 38 is connected to the blow port 317 through the blow pipe 381, and a blow valve 382 is provided on the blow pipe 381. When the filter holes on the filter bag 33 are clogged with dust, the blower 38 and the blow valve 382 are opened to blow the filter bag 33 back with high-pressure air, so that the dust on the filter bag 33 can be blown away, so that the filter bag 33 can continue to filter.

[0065] When the dust removal device 3 is working, the flue gas enters the treatment chamber 316 through the exhaust gas inlet 311 and enters the filter bag 33. The clean exhaust gas passes through the filter bag 33 and enters the bag chamber 315 and is discharged from the exhaust gas outlet 144. The dust in the exhaust gas is blocked by the filter bag 33 and falls from the filter bag 33 to the discharge port 314 at the bottom of the box body 31, and is discharged to the packaging system for recycling at a regular time.

[0066] When there is a lot of dust adhering to the filter bag 33, the vibrator 36 is turned on to control the vibration of the filter bag 33 to shake off the dust on the filter bag 33. When the filter holes on the filter bag 33 are blocked by dust, the filter bag 33 is back-blown by the back-blowing machine 38 to blow away the dust in the filter holes and restore the filtering capacity of the filter bag 33.

[0067] The two ends of the third hot air pipe 57 are respectively connected to the hot air outlet pipe 545 and the exhaust pipe 34, and a third hot air valve is provided on the third hot air pipe 57. Since the exhaust gas has high humidity and low dew point, it is easy to condense and clog the filter bag 33 after it enters the dust removal device 3 and contacts with the air for cooling, which affects the waste gas treatment. The hot air is mixed with the waste gas and enters the dust removal device 3, which can increase the dew point temperature of the waste gas and reduce the adhesion and clogging of the filter bag.

[0068] Working process of the utility model: Potash fertilizer wet material enters the drying chamber 111 of the dryer 1 through the feed port 12. The air is filtered by the first air filter 43 and then pressurized by the first fan 41 to enter the gas heating furnace 4 for heating, and then enters the drying chamber 111 as hot air to directly contact with the potash fertilizer wet material for drying; or the air enters the steam heater 5 through the second air filter 56 for heating and then enters the drying chamber 111 as hot air.

[0069] The potash fertilizer wet material is continuously broken up and turned over at the front end of the drying chamber 111, and pre-dried by hot air heating. As the cylinder 11 rotates, the potash fertilizer wet material continuously moves to the rear end of the drying chamber 111. The pre-dried potash fertilizer wet material is evenly dispersed between the steam heating pipes 151, and is dried by heat exchange with the steam in the steam heating pipes 151. As the cylinder 11 rotates, the dried potash fertilizer material finally enters the discharge box 14, and the dry potash fertilizer discharged from the discharge port 143 enters the packaging process for packaging. The dry potash fertilizer discharged from the return port 142 returns to the feed port 12 through the return device 7, and enters the drying chamber after being mixed with the potash fertilizer wet material.

[0070] The steam in the steam heating pipe exchanges heat with the potash fertilizer wet material and condenses into condensate, which is discharged into the condensate tank through the condensate outlet 153 for recycling.

[0071] The water vapor and dust generated during the drying process of the potash fertilizer wet material are mixed with the hot air to form waste gas, which is discharged from the waste gas outlet 144 into the dust removal device 3 for treatment. The dust in the waste gas is discharged from the discharge port 314 and then recovered, and the clean waste gas is discharged from the waste gas outlet 144.

[0072] The utility model is provided with a gas heating furnace 4 and a steam heater 5, the gas heating furnace 4 is connected to the hot air inlet 13 of the dryer 1 through a first hot air pipe 42, and the steam heater 5 is connected to the hot air inlet 13 of the dryer 1 through a second hot air pipe 52. When the gas is not limited, the hot air generated by the gas heating furnace 4 is used to enter the drying chamber to heat the potash fertilizer wet material in the drying chamber. When the natural gas supply is limited, the steam heater 5 is used to heat the air to provide hot air to dry the potash fertilizer wet material. When the potash fertilizer output is large, the gas heating furnace 4 and the steam heater 5 are used to supply hot air at the same time to improve the drying efficiency. By combining the two heating methods of steam and natural gas to provide hot air, the drying efficiency of the potash fertilizer wet material can be improved, thereby improving the potash fertilizer production efficiency, and solving the problem that the existing potash fertilizer production process is greatly affected by the gas supply.

[0073] The steam heater 5 includes an inner shell 54 and an outer shell 53. The inner shell 54 is fixedly arranged inside the outer shell 53, and a heating chamber 533 is formed between the outer shell 53 and the inner shell 54. A heat exchange chamber 541 is arranged inside the inner shell 54. A heat exchange tube 55 connected to the heating chamber 533 is arranged inside the heat exchange chamber 541. The air in the heat exchange chamber 541 is heated from the outside of the heat exchange chamber 541 by the steam in the heating chamber 533, and the air in the heat exchange chamber 541 is heated from the inside of the heat exchange chamber 541 by the steam in the heat exchange tube 55. The air is heated at the same time, which can improve the heating efficiency of the air.

[0074] The dust removal device 3 includes a box body 31, a partition 32 and a filter bag 33. The interior of the box body 31 is divided into a treatment chamber 316 and a bag chamber 315 by the partition 32. The treatment chamber 316 is communicated with the exhaust gas inlet 311, and the bag chamber 315 is communicated with the exhaust gas outlet 144. The filter bag 33 is arranged in the bag chamber 315, and the open end is installed at the through hole 321 on the partition 32. After the flue gas entering the treatment chamber 316 through the exhaust gas inlet 311 enters the filter bag 33, the clean flue gas passes through the filter bag 33 and enters the bag chamber 315 and is discharged from the exhaust gas outlet 144. The dust in the flue gas is blocked by the filter bag 33 and falls from the filter bag 33 to the discharge port 314 at the bottom of the box body 31, and is recovered after being discharged regularly, thereby improving the yield of potash fertilizer.

[0075] The closed end of the filter bag 33 is suspended on the top of the box body 31 by a spring 35. The spring 35 can support the filter bag 33 and keep the filter bag 33 at a moderate tightness. It can prevent the filter bag 33 from being damaged when it is subjected to excessive force. It can also increase the vibration of the filter bag 33 and promote the falling of dust on the filter bag 33.

[0076] By setting the top of the spring 35 to be fixedly connected to the top of the box body 31 through the vibrator 36, when there is too much dust adhering to the filter bag 33, the vibrator 36 can control the spring 35 to drive the filter bag 33 to vibrate, thereby shaking off the dust on the filter bag 33, preventing the excessive dust on the filter bag 33 from blocking the filter bag 33 and affecting the normal operation of the dust removal device 3. By setting a backflush port 317 connected to the bag chamber 315 on the box body 31, when the filter hole on the filter bag 33 is blocked by dust, the filter bag 33 can be backflushed by high-pressure air to blow away the dust on the filter bag 33, so that the filter bag 33 can continue to filter.

[0077] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims

1. A system for drying potash fertilizer using gas coupled with steam, characterized in that: It comprises a dryer (1), a hot air device (2) and a dust removal device (3), The dryer (1) is provided with a feed inlet (12), a discharge outlet (141), a first steam inlet (152), a condensed water outlet (153), a hot air inlet (13) and an exhaust gas outlet (144), and a drying chamber (111) is formed inside, and a steam heating pipe (151) is provided inside the drying chamber (111); The steam heating pipe (151) is respectively connected to the first steam inlet (152) and the condensed water outlet (153); The first steam inlet (152) is used to communicate with a steam pipeline; The hot air device (2) comprises a gas heating furnace (4), a first fan (41), a first hot air pipe (42), a steam heater (5), a second fan (51) and a second hot air pipe (52), The gas heating furnace (4) is provided with a gas inlet (44), an air inlet (45) and a hot air outlet (46); The gas inlet (44) is used to communicate with the gas pipeline; The first fan (41) is in communication with the air inlet (45); The first hot air pipe (42) is connected to the hot air outlet (46) and the hot air inlet (13) respectively, and a first hot air valve (421) is provided on the first hot air pipe (42); The steam heater (5) is provided with a second steam inlet (531), an air inlet pipe (544) and a hot air outlet pipe (545). The second steam inlet (531) is used to communicate with a steam pipeline; The second fan (51) is in communication with the air intake pipe (544); The two ends of the second hot air pipe (52) are respectively connected to the hot air outlet pipe (545) and the hot air inlet (13), and the second hot air pipe (52) is provided with a second hot air valve (521); The dust removal device (3) is connected to the exhaust gas outlet (144) via an exhaust gas pipeline (34) and is used to process the exhaust gas.

2. A system for drying potash fertilizer using gas coupled with steam according to claim 1, characterized in that: The steam heater (5) comprises an outer shell (53), an inner shell (54) and a heat exchange tube (55). The shell (53) is provided with a second steam inlet (531) and a second steam outlet (532); The inner shell (54) is fixedly arranged inside the outer shell (53); a heat exchange cavity (541) is formed inside the inner shell (54); a third steam inlet (542), a third steam outlet (543), and an air inlet pipe (544) and a hot air outlet pipe (545) communicating with the heat exchange cavity (541) are arranged on the inner shell (54); A heating chamber (533) is formed between the inner shell (54) and the outer shell (53); One end of the air inlet pipe (544) and the hot air outlet pipe (545) away from the inner shell (54) passes through the outer shell (53) and extends to the outside of the outer shell (53); The heat exchange tube (55) is arranged in the heat exchange cavity (541), and its two ends are respectively connected to the third steam inlet (542) and the third steam outlet (543).

3. A system for drying potash fertilizer using gas coupled with steam according to claim 2, characterized in that: The dust removal device (3) comprises a housing (31), a partition (32) and a filter bag (33). The side wall of the box body (31) is provided with an exhaust gas inlet (311) and an exhaust gas outlet (312)(16), and the bottom plate (313) of the box body (31) is provided with a discharge port (314); The partition (32) is horizontally arranged in the box body (31) to separate the interior of the box body (31) into a disposal chamber (316) located at the lower part of the box body (31) and a bag chamber (315) located at the upper part of the box body (31); a plurality of through holes (321) are arranged on the partition (32) to communicate with the bag chamber (315) and the disposal chamber (316); The treatment chamber (316) is in communication with the waste gas inlet (311) and the discharge port (314); The bag chamber (315) is in communication with the tail gas outlet (312); The filter bag (33) is arranged in the bag chamber (315), one end of the filter bag (33) is open and the other end is closed, the closed end of the filter bag (33) is fixed to the top of the bag chamber (315), and the open end is fixed to the through hole (321) on the partition (32), and the interior of the filter bag (33) is connected to the disposal chamber (316).

4. A system for drying potash fertilizer using gas coupled with steam according to claim 3, characterized in that: The closed end of the filter bag (33) is suspended on the top of the box (31) by a spring (35).

5. A system for drying potash fertilizer using gas coupled with steam according to claim 4, characterized in that: The top of the spring (35) is fixedly connected to the top of the box (31) via a vibrator (36).

6. A system for drying potash fertilizer using gas coupled with steam according to claim 5, characterized in that: It also includes an induced draft fan (37) and a reverse draft fan (38), A back-blowing port (317) communicating with the bag chamber (315) is provided on the side wall of the box body (31); The induced draft fan (37) is in communication with the exhaust gas outlet (312); The back-blowing blower (38) is connected to the back-blowing port (317) via a back-blowing pipe (381).

7. A system for drying potash fertilizer using gas coupled with steam according to claim 6, characterized in that: It also includes a third hot air pipe (57), The two ends of the third hot air pipe (57) are respectively connected to the hot air outlet pipe (545) and the exhaust gas pipe (34), and the third hot air pipe (57) is provided with a third hot air valve.

8. The system for drying potash fertilizer using gas coupled with steam according to claim 7 is characterized in that: A first air filter (43) is provided at the air inlet of the first fan (41); A second air filter (56) is provided at the air inlet of the second fan (51).

9. The system for drying potash fertilizer using gas coupled with steam according to claim 7, characterized in that: It also includes a material returning device (7), The material discharge port (141) includes a material discharge port (143) and a material return port (142); The material return device (7) is connected to the material return port (142) and the material feed port (12) respectively.

10. A system for drying potash fertilizer using gas coupled with steam according to any one of claims 1 to 9, characterized in that: It also includes a steam condensate tank (6), The steam condensate tank (6) is in communication with the condensate outlet (153).

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