Ammonium sulfate solution evaporation device for ammonium persulfate production

Abstract

The utility model relates to an ammonium sulfate solution evaporation device for ammonium persulfate production, which comprises an evaporator, a thickener, a crystal slurry pump and a crystallizing tank which are connected in sequence, the thickener is connected with a feeding pipe of the evaporator through a circulating pump, a steam outlet of the evaporator is connected with a steam compressor through a demister, and the crystallizing tank is connected with the evaporator. The steam compressor is connected with a steam inlet in the evaporator, the raw material feeding pipeline is connected with the feeding pipe, and the live steam pipeline is connected with the steam inlet. According to the ammonium sulfate solution evaporation device for ammonium persulfate production, the thickener is arranged, so that the solid-to-liquid ratio of discharged materials is increased, the discharging amount is increased, the load of a centrifugal machine is reduced, the production efficiency is improved, and energy conservation and consumption reduction are achieved. The upper clear liquid of the thickener returns into the evaporator through the raw material circulating pipeline and sprays the heat exchange rotor, and the solid-liquid ratio of the raw material circulating pipeline is lower than that of the raw material liquid, so that the heat exchange rotor can be better flushed, and the effect of delaying scaling of the heat exchange rotor can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ammonium persulfate production, and particularly relates to an evaporation device for ammonium sulfate solution used in ammonium persulfate production. Background Art

[0002] The electrolytic production of ammonium persulfate is a common industrial method, which generates ammonium persulfate by electrolyzing an aqueous solution of ammonium sulfate and sulfuric acid. The production of ammonium persulfate usually requires pure and high-purity ammonium sulfate as a raw material. Therefore, it is necessary to evaporate and crystallize the ammonium sulfate aqueous solution to obtain pure ammonium sulfate solid. In current production, the direct discharge from the evaporator results in a low solid-liquid ratio, causing a large load on the centrifuge after discharge. The circulating liquid returning to the evaporator has a relatively large solid-liquid ratio, leading to low production efficiency. Moreover, the heat exchange components inside the evaporator are prone to fouling. Therefore, it is necessary to propose an evaporation device for ammonium sulfate solution used in ammonium persulfate production that can improve production efficiency, save energy and reduce consumption, and delay the fouling of the heat exchange components of the evaporator. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an evaporation device for ammonium sulfate solution used in ammonium persulfate production that can improve production efficiency, save energy and reduce consumption, and delay the fouling of the heat exchange components of the evaporator.

[0004] To solve the above problems, the technical solution adopted by the utility model is:

[0005] An evaporation device for ammonium sulfate solution used in ammonium persulfate production, which includes an evaporator, a thickener, a crystal slurry pump, and a crystallization tank connected in sequence. The thickener is connected to the feed pipe of the evaporator through a circulation pump. The steam outlet of the evaporator is connected to a steam compressor through a demister. The steam compressor is connected to the steam inlet inside the evaporator. It also includes a raw material feeding pipeline connected to the feed pipe and a live steam pipeline connected to the steam inlet.

[0006] As an implementation manner of the utility model, the evaporator includes a housing and a heat exchange rotor arranged inside it. A spraying mechanism is arranged above the heat exchange rotor inside the housing, and the spraying mechanism is connected to the feed pipe. The heat exchange rotor includes a rotating shaft, a first ventilation disc and a second ventilation disc coaxially arranged on the rotating shaft. Both the first ventilation disc and the second ventilation disc are hollow discs, and a plurality of ventilation pipes are connected between the first ventilation disc and the second ventilation disc. An installation groove is axially opened inside the left end of the rotating shaft. A rotating groove communicating with the first ventilation disc is opened on the inner end side wall of the installation groove. A condensate water pipe is arranged inside the installation groove, and the inner end of the condensate water pipe vertically extends to the bottom of the inner cavity of the first ventilation disc. The left end of the rotating shaft is connected to a vacuum pipe through a rotary joint. An air inlet sleeve is arranged outside the rotating shaft at the right end of the second ventilation disc, and the air inlet sleeve is connected to an air inlet box fixed on the right side of the housing. A steam inlet is arranged on the air inlet box. The right end of the rotating shaft is connected to a driving mechanism.

[0007] As an embodiment of the present utility model, the spraying mechanism includes a spray pipe axially arranged at the top inside the housing along the axis of the housing and a plurality of spray heads arranged on the spray pipe. The feed pipe is arranged at the top of the housing and is connected to the spray pipe. The bottom of the housing is provided with a discharge pipe. The top of the thickener is provided with a feed inlet, the bottom is provided with a discharge outlet, and the upper side wall is provided with a liquid outlet. The feed inlet of the thickener is connected to the discharge pipe of the housing, and the liquid outlet of the thickener is connected to the feed pipe through a raw material circulation pipeline. A circulation pump is arranged on the raw material circulation pipeline.

[0008] As an embodiment of the present utility model, the intake sleeve passes through the right side wall of the housing, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a raw material lubrication pipeline and is lubricated and flushed by introducing raw material liquid. The right end of the rotating shaft passes through the right side wall of the intake box, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a raw material lubrication pipeline and is lubricated and flushed by introducing raw material liquid. The left end of the rotating shaft passes through the left side wall of the housing, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a process water pipeline and is lubricated and flushed by introducing process water.

[0009] As an embodiment of the present utility model, a vacuum extraction port is opened on the side wall of the vacuum tube. The left end of the condensate water pipe passes through the left end of the vacuum tube, and a mechanical seal is arranged between them. The vacuum extraction port is connected to a vacuum system for controlling the vacuum degree inside the evaporator. The condensate water pipe is connected to a water extraction pump for discharging the condensate water inside the heat exchange rotor.

[0010] As an embodiment of the present utility model, the process water pipeline is also connected to the intake box, and a drain port is arranged at the bottom of the intake box.

[0011] As an embodiment of the present utility model, the driving mechanism includes a driven sprocket fixedly arranged at the right end of the rotating shaft and a reduction motor fixedly arranged on the bottom plate. A driving sprocket is arranged on the output shaft of the reduction motor, and the driving sprocket and the driven sprocket are connected by a chain.

[0012] As an embodiment of the present utility model, bearings are arranged between the left end of the rotating shaft and the left side wall of the housing, between the right side wall of the housing and the intake sleeve, and between the right side wall of the intake box and the rotating shaft.

[0013] As an embodiment of the present utility model, an annular external thread interface is arranged on the right side wall of the housing around the rotating shaft. The intake box is a cylinder with a horizontal axis and an open left end, and an internal thread corresponding to the external thread interface is arranged at the opening of the intake box.

[0014] As an embodiment of the present utility model, a steam outlet is provided at the top of the housing. The steam outlet is connected to a steam compressor through a secondary steam pipeline. The demister is arranged on the secondary steam pipeline. The steam compressor is connected to the steam inlet of the air inlet box through a steam circulation pipeline.

[0015] The beneficial effects produced by adopting the above technical solutions are as follows:

[0016] By arranging a thickener in the ammonium sulfate solution evaporation device for ammonium persulfate production, the solid-liquid ratio of the discharged material is increased, the discharged amount is increased, the load of the centrifuge is reduced, the production efficiency is improved, and energy is saved and consumption is reduced. The supernatant liquid at the upper part of the thickener returns to the evaporator through the raw material circulation pipeline and sprays the heat exchange rotor. Since the solid-liquid ratio of the raw material circulation pipeline is relatively lower than that of the raw material liquid, better flushing of the heat exchange rotor can be realized, which can play a role in delaying the scaling of the heat exchange rotor. By introducing the raw material liquid or process water into the mechanical seal, the semi-liquid and semi-solid material is prevented from entering the sealing surface, and the service life of the mechanical seal is improved. Description of the Drawings

[0017] Figure 1 is the process flow chart of the present utility model.

[0018] Figure 2 is the structural schematic diagram of the evaporator in the present utility model.

[0019] Figure 3 is the structural schematic diagram of the heat exchange rotor in the present utility model.

[0020] Figure 4 is the internal structural schematic diagram of the heat exchange rotor in the present utility model.

[0021] Among them: 100 evaporator; 200 thickener, 300 crystal slurry pump, 400 crystallization tank, 500 circulation pump, 600 demister, 700 steam compressor;

[0022] 1 housing, 2 spray pipe, 3 rotating shaft, 4 installation groove, 5 rotating groove, 6 first ventilation disc, 7 second ventilation disc, 8 air inlet sleeve, 9 ventilation pipe, 10 air inlet box, 11 driven sprocket, 12 driving sprocket, 13 reduction motor, 14 bracket, 15 condensate water pipe, 16 vacuum pipe, 17 vacuum extraction port, 18 raw material circulation pipeline, 19 raw material feeding pipeline, 20 feed pipe, 21 secondary steam pipeline, 23 steam circulation pipeline, 24 live steam pipeline, 25 raw material lubrication pipeline, 26 process water pipeline, 27 mechanical seal, 28 rotary joint, 29 discharge pipe, 30 steam outlet, 31 steam inlet, 32 bottom plate. Specific Embodiments

[0023] To make the objectives, technical solutions and advantages of the present utility model clearer, the following provides a clear and complete description of the utility model with reference to specific embodiments.

[0024] As Figure 1 shown, an ammonium sulfate solution evaporation device for ammonium persulfate production includes an evaporator 100, a thickener 200, a slurry pump 300, and a crystallization tank 400 connected in sequence. The thickener 200 is connected to the feed pipe 20 of the evaporator 100 through a circulation pump 500. The steam outlet 30 of the evaporator 100 is connected to a steam compressor 700 through a demister 600. The steam compressor 700 is connected to the steam inlet 31 inside the evaporator 100. It also includes a raw material feeding pipeline 19 connected to the feed pipe 20 and a live steam pipeline 24 connected to the steam inlet 31. By setting the thickener 200, the ammonium sulfate solution evaporation device for ammonium persulfate production increases the solid-liquid ratio of the discharge, improves the discharge volume, reduces the centrifuge load, and improves the production efficiency.

[0025] As Figures 2 - 4 shown, the evaporator 100 includes a housing 1 and a heat exchange rotor disposed inside it. A spraying mechanism is provided above the heat exchange rotor inside the housing 1, and the spraying mechanism is connected to the feed pipe 20. The heat exchange rotor includes a rotating shaft 3, a first ventilation disk 6 and a second ventilation disk 7 coaxially arranged on the rotating shaft 3. Both the first ventilation disk 6 and the second ventilation disk 7 are hollow disks, and a plurality of ventilation pipes 9 are connected between the first ventilation disk 6 and the second ventilation disk 7. The ventilation pipes 9 are connected between the outer edge and the inside of the first ventilation disk 6 and the second ventilation disk 7 to ensure that the condensed water can flow to the lower part of the first ventilation disk 6. As a further optimization, the ventilation pipe 7 is inclined, and the connection with the first ventilation disk 6 is located outside the connection with the second ventilation disk 7, so that the condensed water can enter the lower part of the first ventilation disk 6 faster under the action of centrifugal force. An installation groove 4 is axially opened inside the left end of the rotating shaft 3. A rotating groove 5 communicating with the first ventilation disk 6 is opened on the inner end side wall of the installation groove 4. A rigid condensation water pipe 15 is provided inside the installation groove 4. The inner end of the condensation water pipe 15 vertically extends to the bottom of the inner cavity of the first ventilation disk 6. The left end of the rotating shaft 3 is connected to a vacuum pipe 16 through a rotary joint 28. The rotating groove 5 divides the rotating shaft 3 located outside the installation groove 4 into left and right sections, so that the first ventilation disk 6 does not interfere with the condensation water pipe 15 when rotating. An air inlet sleeve 8 is provided on the outside of the rotating shaft 3 at the right end of the second ventilation disk 7. The air inlet sleeve 8 is connected to an air inlet box 10 fixed on the right side of the housing 1. The air inlet box 10 is provided with a steam inlet 31. The right end of the rotating shaft 3 is connected to a driving mechanism.

[0026] The spraying mechanism includes a spray pipe 2 axially arranged at the top inside the housing 1 along the axis of the housing 1 and a plurality of spray heads arranged on the spray pipe 2. The feed pipe 20 is arranged at the top of the housing 1 and is connected to the spray pipe 2. A discharge pipe 29 is arranged at the bottom of the housing 1. The thickener 200 is provided with a feed inlet at the top, a discharge outlet at the bottom, and a liquid outlet on the upper side wall. The feed inlet of the thickener 200 is connected to the discharge pipe 29 of the housing 1. The liquid outlet of the thickener 200 is connected to the feed pipe 20 through a raw material circulation pipeline 18, and a circulation pump 500 is arranged on the raw material circulation pipeline 18. The upper clear liquid of the thickener 200 returns to the evaporator 100 through the raw material circulation pipeline 18 and sprays on the heat exchange rotor. Since the solid-liquid ratio of the raw material circulation pipeline 18 is relatively lower than that of the raw material liquid, better flushing of the heat exchange rotor can be achieved, which can play a role in delaying the fouling of the heat exchange rotor.

[0027] The intake sleeve 8 passes through the right side wall of the housing 1, and a mechanical seal 27 is arranged between them. The mechanical seal is externally connected to a raw material lubrication pipeline 25, and lubrication flushing is carried out by introducing raw material liquid. The right end of the rotating shaft 3 passes through the right side wall of the intake box 10, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a raw material lubrication pipeline 25, and lubrication flushing is carried out by introducing raw material liquid. The left end of the rotating shaft 3 passes through the left side wall of the housing 1, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a process water pipeline 26, and lubrication flushing is carried out by introducing process water. By introducing raw material liquid or process water into the mechanical seal 27, the semi-liquid and semi-solid material is prevented from entering the sealing surface, and the service life of the mechanical seal 27 is improved.

[0028] A vacuum extraction port 17 is provided on the side wall of the vacuum tube 16. The left end of the condensate water pipe 15 passes through the left end of the vacuum tube 16, and a mechanical seal is arranged between them. The vacuum extraction port 17 is connected to a vacuum system for controlling the vacuum degree inside the evaporator. The condensate water pipe 15 is connected to a water extraction pump for discharging the condensate water inside the heat exchange rotor.

[0029] The process water pipeline 26 is also connected to the intake box 10, and a drain port is arranged at the bottom of the intake box 10. The steam temperature inside the heat exchange rotor can be adjusted through the process water pipeline 26.

[0030] The driving mechanism includes a driven sprocket 11 fixedly arranged at the right end of the rotating shaft 3 and a reduction motor 13 fixedly arranged on the bottom plate 32. A driving sprocket 12 is arranged on the output shaft of the reduction motor 13, and the driving sprocket 12 and the driven sprocket 11 are connected by a chain. A bracket 14 is arranged on the bottom plate 32, and the right end of the rotating shaft 3 is arranged on the bracket 14 through a bearing. Bearings are arranged between the left end of the rotating shaft 3 and the left side wall of the housing 1, between the right side wall of the housing 1 and the intake sleeve 8, and between the right side wall of the intake box 10 and the rotating shaft 3.

[0031] In this embodiment, an annular external thread interface is provided on the right side wall of the housing 1 around the rotating shaft 3. The air inlet box 10 is a cylinder with a horizontal axis and an open left end. An internal thread corresponding to the external thread interface is provided at the opening of the air inlet box 10.

[0032] A steam outlet 30 is provided at the top of the housing 1. The steam outlet 30 is connected to a steam compressor 700 through a secondary steam pipeline 21. A demister 600 is provided on the secondary steam pipeline 21. The steam compressor 700 is connected to the steam inlet 31 of the air inlet box 10 through a steam circulation pipeline 23. After the steam evaporated by the evaporator 100 is defoamed by the demister 600, the steam is pressurized and heated by the steam compressor 700, and finally introduced into the heat exchange rotor, realizing the full utilization of steam and playing the role of energy conservation and consumption reduction.

[0033] Working process:

[0034] Drive the heat exchange rotor to rotate through the drive mechanism, and feed materials into the evaporator 100 through the feed pipe 20;

[0035] Open the valves on the vacuum system and the live steam pipeline 24, and set the temperature and vacuum degree of the evaporator 100; after the temperature and vacuum degree reach the requirements, turn on the steam compressor 700;

[0036] Turn on the circulation pump 500 to circulate the materials and spray the heat exchange rotor;

[0037] After the solid-liquid ratio of the slurry at the discharge port of the thickener 200 meets the requirements, turn on the crystal slurry pump 300 to pump the slurry into the crystallization tank 400, and produce ammonium sulfate for the production of ammonium persulfate through centrifugal separation. The separated mother liquor is recycled;

[0038] The condensed water collected by the condensate pipe 15 is used in the persulfate production system.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An evaporation device for ammonium sulfate solution used in the production of ammonium persulfate, characterized in that: It includes an evaporator, a thickener, a magma pump and a crystallization tank connected in sequence. The thickener is connected to the feed pipe of the evaporator through a circulation pump. The steam outlet of the evaporator is connected to a steam compressor through a demister. The steam compressor is connected to the steam inlet in the evaporator. It also includes a raw material feeding pipeline connected to the feed pipe and a live steam pipeline connected to the steam inlet.

2. The ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 1, characterized in that: The evaporator includes a housing and a heat exchange rotor arranged inside it. A spraying mechanism is arranged above the heat exchange rotor inside the housing, and the spraying mechanism is connected to the feed pipe. The heat exchange rotor includes a rotating shaft, a first ventilation disc and a second ventilation disc coaxially arranged on the rotating shaft. Both the first ventilation disc and the second ventilation disc are hollow discs, and a plurality of ventilation pipes are communicated between the first ventilation disc and the second ventilation disc. An installation groove is axially opened inside the left end of the rotating shaft, a rotating groove communicated with the first ventilation disc is opened on the inner end side wall of the installation groove, a condensate water pipe is arranged inside the installation groove, the inner end of the condensate water pipe vertically extends to the bottom of the inner cavity of the first ventilation disc, and the left end of the rotating shaft is connected to a vacuum pipe through a rotary joint. An air inlet sleeve is arranged outside the rotating shaft at the right end of the second ventilation disc, and the air inlet sleeve is communicated with an air inlet box fixed on the right side of the housing. A steam inlet is arranged on the air inlet box. The right end of the rotating shaft is connected to a driving mechanism.

3. The ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 2, characterized in that: The spraying mechanism includes a spraying pipe arranged along the axial direction of the housing at the top inside the housing and a plurality of spray heads arranged on the spraying pipe. The feed pipe is arranged at the top of the housing and connected to the spraying pipe. A discharge pipe is arranged at the bottom of the housing. The thickener is provided with a feed inlet at the top, a discharge outlet at the bottom, and a liquid outlet on the upper side wall. The feed inlet of the thickener is connected to the discharge pipe of the housing. The liquid outlet of the thickener is connected to the feed pipe through a raw material circulation pipeline, and the circulation pump is arranged on the raw material circulation pipeline.

4. An ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 3, characterized in that: The air inlet sleeve passes through the right side wall of the housing, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a raw material lubrication pipeline and is lubricated and flushed by introducing raw material liquid. The right end of the rotating shaft passes through the right side wall of the air inlet box, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a raw material lubrication pipeline and is lubricated and flushed by introducing raw material liquid. The left end of the rotating shaft passes through the left side wall of the housing, and a mechanical seal is arranged between them. The mechanical seal is externally connected to a process water pipeline and is lubricated and flushed by introducing process water.

5. An ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 3, characterized in that: A vacuum extraction port is opened on the side wall of the vacuum pipe. The left end of the condensate water pipe passes through the left end of the vacuum pipe, and a mechanical seal is arranged between them. The vacuum extraction port is connected to a vacuum system for controlling the vacuum degree inside the evaporator. The condensate water pipe is connected to a water extraction pump for discharging the condensate water inside the heat exchange rotor.

6. The ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 4, characterized in that: The process water pipeline is also connected to the air inlet box, and a drain port is arranged at the bottom of the air inlet box.

7. An ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 2, characterized in that: The driving mechanism includes a driven sprocket fixed at the right end of the rotating shaft and a reduction motor fixed on the bottom plate. A driving sprocket is arranged on the output shaft of the reduction motor, and the driving sprocket and the driven sprocket are connected by a chain.

8. The ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 2, characterized in that: Bearings are provided between the left end of the rotating shaft and the left side wall of the housing, between the right side wall of the housing and the intake sleeve, and between the right side wall of the intake box and the rotating shaft.

9. The ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 8, wherein: An annular external thread interface is provided on the right side wall of the housing around the rotating shaft. The intake box is a cylinder with a horizontal axis and an open left end. An internal thread corresponding to the external thread interface is provided at the opening of the intake box.

10. The ammonium sulfate solution evaporation device for ammonium persulfate production according to claim 2, characterized in that: A steam outlet is provided at the top of the housing. The steam outlet is connected to a steam compressor through a secondary steam pipeline. The demister is arranged on the secondary steam pipeline. The steam compressor is connected to the steam inlet of the intake box through a steam circulation pipeline.

Images