Blending and mixing production device and process for dinitrate reaction

Abstract

The invention relates to the technical field of chemical production, and provides a dinitrate reaction batching and mixing production device and process, the dinitrate reaction batching and mixing production device comprises a dinitrate and mixed acid mixer, the dinitrate and mixed acid mixer comprises a shell, one end of the top of the shell is fixedly connected with a first feeding pipe, and one end of the bottom of the shell is fixedly connected with a second feeding pipe; the outlet end of the shell is fixedly connected with a discharging pipe, the inner side of the shell is rotatably connected with a rotating shaft, the outer side of the rotating shaft is fixedly connected with a plurality of stirring blades, one end of the rotating shaft is provided with a transmission mechanism, the transmission mechanism comprises a mounting box, one side of the mounting box is fixedly connected with a plurality of mounting rods, and the inner side of the mounting box is rotatably connected with a first bevel gear; one side of the first bevel gear is fixedly connected with the rotating shaft, a second bevel gear is rotationally connected to one end of the inner side of the mounting box, a first belt wheel is rotationally connected to the outer side of the shell, and a thermal driving mechanism is arranged at one end of the shell. The mixing efficiency of concentrated nitric acid and concentrated sulfuric acid is improved, and an external driving source is not needed, so that the use cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical production, and in particular to a dinitrile reaction batching and mixing production device and process. Background Art

[0002] Dinitrochlorobenzene is an important chemical raw material, which is widely used in medicine, pesticides, dyes, explosives, chemical additives and other fields. With the continuous development of the domestic chemical industry, the market demand for 2,4-dinitrochlorobenzene is also increasing. The main production method of 2,4-dinitrochlorobenzene is the traditional kettle nitration synthesis process, in which concentrated nitric acid and concentrated sulfuric acid need to be mixed for dinitrification reaction, which requires the use of an acid mixer.

[0003] After searching, the Chinese patent publication number CN203816563U disclosed "a nitric acid mixing device, including a mixing acid tower, a mixing acid pump and connecting pipelines, the mixing acid tower is provided with fillers, the mixing acid tower is provided with a circulating acid inlet, a dilute nitric acid inlet, a mixed acid outlet and a concentrated nitric acid inlet, the two ends of the cooling coil are respectively connected to the circulating water outlet and the circulating water inlet, the mixing acid pump inlet is connected to the mixed acid outlet, and the mixed acid pump outlet is connected to the circulating acid inlet".

[0004] However, in the process of implementing the relevant technology, this type of patent has some technical defects: first, this type of patent mixes the circulating acid from the top of the mixed acid tower from top to bottom inside the filler, mainly through mixed flow, and the flow rate of the mixed acid in the filler is slow, which makes the mixing efficiency of the two acid liquids low; second, a large amount of heat will be released during the acid mixing process, and this patent directly performs indirect cooling in the mixed acid tower by circulating water, which requires a large amount of cooling water to achieve cooling, thereby increasing the cost of mixed acid. In view of this, the present invention proposes a dinitrogen reaction ingredient mixing production device. Summary of the invention

[0005] The invention provides a dinitrogen reaction batching and mixing production device and process, which solves the problem of low mixing efficiency of the mixed flow method in the prior art.

[0006] The technical scheme of the present invention is as follows: a dinitro reaction batching and mixing production device, comprising a dinitro mixed acid mixer, the dinitro mixed acid mixer comprising a shell, one end of the top of the shell is fixedly connected to a first feed pipe for introducing concentrated nitric acid, one end of the bottom of the shell is fixedly connected to a second feed pipe for introducing concentrated sulfuric acid, the outlet end of the shell is fixedly connected to a discharge pipe for conducting nitric and sulfuric acid mixed acid, the inner side of the shell is rotatably connected to a rotating shaft, the outer side of the rotating shaft is fixedly connected to a plurality of stirring blades, one end of the rotating shaft is provided with a transmission mechanism, the transmission mechanism comprises an installation box, the installation box One side of the packaging box is fixedly connected to a plurality of mounting rods which are distributed at equal angles around the mounting box, and one end of the plurality of mounting rods away from the mounting box is fixedly connected to the inner wall of the shell, the inner side of the mounting box is rotatably connected to a first bevel gear, one side of the first bevel gear is fixedly connected to a rotating shaft, one end of the inner side of the mounting box is rotatably connected to a second bevel gear meshing with the first bevel gear, the outer side of the shell is rotatably connected to a first pulley which is coaxially fixedly connected to the second bevel gear, and one end of the shell is provided with a thermal drive mechanism which drives the first pulley to rotate by absorbing heat released by the reaction of concentrated nitric acid and concentrated sulfuric acid.

[0007] Preferably, the inlet end of the first feed pipe is fixedly connected to a nitric acid pump via a conduit, the inlet end of the nitric acid pump is fixedly connected to a concentrated nitric acid tank via a conduit, the inlet end of the second feed pipe is fixedly connected to a sulfuric acid pump via a conduit, and the inlet end of the sulfuric acid pump is fixedly connected to a concentrated sulfuric acid transfer tank via a conduit.

[0008] Preferably, the outlet end of the discharge pipe is fixedly connected to a tubular heat exchanger via a conduit, the inlet end of the tube side of the tubular heat exchanger is connected to the discharge pipe, circulating cooling water is introduced into the shell side of the tubular heat exchanger, and the outlet end of the tube side of the tubular heat exchanger is fixedly connected to a dinitro mixed acid tank via a conduit.

[0009] Preferably, the thermal driving mechanism includes a heat conducting tube, the heat conducting tube is fixedly connected to one end of the shell, the inner side of the heat conducting tube is fixedly connected to a concentrically arranged sealing tube, the inner side of the sealing tube close to the shell is filled with heat-sensitive gas, the inner side of the sealing tube is provided with a piston member that moves under the action of thermal expansion of the heat-sensitive gas, the outer side of the heat conducting tube is provided with a linkage member that drives the first pulley to rotate by cooperating with the movement of the piston member, one end of the bottom of the sealing tube is fixedly connected to an outlet pipe for discharging the heat-sensitive gas, the outlet pipe is fixedly connected to an outlet one-way valve, the other end of the bottom of the sealing tube is fixedly connected to an inlet pipe for introducing the heat-sensitive gas, the inlet pipe is fixedly connected to an inlet one-way valve, the outer side of the heat conducting tube is provided with a cooling member for cooling the heat-sensitive gas, the outlet end of the outlet pipe is connected to the inlet end of the cooling member, and the inlet end of the inlet pipe is connected to the outlet end of the cooling member.

[0010] Preferably, one end of the heat-conducting tube is fixedly connected to a plurality of heat-conducting fins which are distributed at equal angles around the heat-conducting tube, and the heat-conducting fins are located on the inner side of the shell.

[0011] Preferably, the piston member includes a piston, which is slidably connected to the inner wall of the sealing cylinder, one end of the sealing cylinder is slidably connected to a guide rod that penetrates the side wall of the sealing cylinder, one end of the guide rod is fixedly connected to the piston, and a return spring is sleeved on the guide rod, one end of the return spring is in contact with the piston, and the other end of the return spring is in contact with the inner wall of the sealing cylinder.

[0012] Preferably, the linkage member includes a fixed seat, which is fixedly connected to the outside of the heat-conducting tube, one side of the fixed seat is rotatably connected to a cam, the outer edge of the cam is rotatably connected to a connecting rod through a pin shaft, one end of the connecting rod away from the cam is hinged to the end of the guide rod, and the other side of the fixed seat is rotatably connected to a second pulley coaxially fixed with the cam, and the second pulley is connected to the first pulley through a belt drive.

[0013] Preferably, the cooling component includes a cooling box, one end of the cooling box is fixedly connected to the air outlet pipe, the other end of the cooling box is fixedly connected to the air inlet pipe, the inner side of the cooling box is fixedly connected with a plurality of partitions evenly distributed in the horizontal direction, the plurality of partitions are staggered up and down and form an S-shaped channel, and the outer side of the cooling box is fixedly connected with a plurality of cooling fins evenly distributed around the cooling box.

[0014] Preferably, a filter assembly is provided at one end of the inner side of the shell, and the filter assembly includes a filter screen fixedly connected to the inside of the shell, and a scraper is fixedly connected to one end of the rotating shaft, and the scraper is slidably connected to the outer wall of the filter screen.

[0015] The present invention also provides a dinitrate reaction batching and mixing production process, comprising the following steps: S1: Start the nitric acid pump and the sulfuric acid pump, and introduce the concentrated nitric acid in the concentrated nitric acid tank and the concentrated sulfuric acid in the concentrated sulfuric acid transfer tank into the shell of the dinitro mixed acid mixer according to a certain flow ratio for mixed acid treatment; S2: Concentrated nitric acid and concentrated sulfuric acid release heat when mixed, causing the temperature inside the shell to rise. At the same time, the heat-conducting tube transfers the heat inside the shell to the sealing tube, causing the thermosensitive gas inside the sealing tube to expand due to the heat. This causes the piston to slide under the pressure of the thermosensitive gas, which causes the piston to overcome the elastic force of the return spring to move, causing the return spring to be compressed and accumulate elastic potential energy. When the piston moves to the position of the outlet pipe, the thermosensitive gas inside the sealing tube is introduced into the outlet pipe and continues to be introduced into the cooling box. The heat of the thermosensitive gas is extracted through the cooling fins and indirectly exchanged with the outside air, thereby cooling the thermosensitive gas. The cooled thermosensitive gas is then re-introduced into the sealing tube through the intake pipe. At this time, the force of the low-temperature thermosensitive gas on the piston is less than the elastic force of the return spring, causing the piston to slide in the opposite direction. When the temperature of the thermosensitive gas rises again and the pressure on the piston is greater than the elastic force of the return spring, the piston will overcome the elastic force of the return spring again to move. In this cycle, the piston can slide back and forth in the sealing tube; S3: When the piston reciprocates, it drives the guide rod to slide back and forth, so that the connecting rod drives the cam to rotate, which makes the second pulley rotate, and the first pulley drives the second bevel gear to rotate synchronously, so that the first bevel gear drives the rotating shaft to rotate, so that all the stirring blades rotate and stir the concentrated nitric acid and concentrated sulfuric acid to make the two fully mixed; S4: The nitric acid-sulfuric acid mixture is discharged into the tube side of the tubular heat exchanger through the discharge pipe, and then circulating cooling water is introduced into the shell side of the tubular heat exchanger, so that the circulating cooling water indirectly cools the nitric acid-sulfuric acid mixture; S5: Finally, the nitric-sulfuric acid mixture flows from the outlet end of the tube side of the tubular heat exchanger into the dinitrogen mixed acid tank, and then is introduced into the dinitrogen mixed acid high-level tank for standby use through an acid pump.

[0016] The working principle and beneficial effects of the present invention are: 1. The concentrated nitric acid in the concentrated nitric acid tank and the concentrated sulfuric acid in the concentrated sulfuric acid transfer tank are metered and introduced into the shell of the dinitro mixed acid mixer according to a certain flow ratio for mixed acid treatment. The concentrated nitric acid and concentrated sulfuric acid will release heat when mixed, causing the temperature inside the shell to rise. The thermal drive mechanism can absorb the heat released by the reaction of the concentrated nitric acid and concentrated sulfuric acid to drive the first pulley to rotate, which causes the second bevel gear to rotate, so that the rotation of the shaft drives all the stirring blades to rotate and stir the concentrated nitric acid and concentrated sulfuric acid, so that the two are quickly and fully mixed, thereby improving the efficiency of mixed acid; 2. By converting the heat energy released by the mixing of concentrated nitric acid and concentrated sulfuric acid into the mechanical kinetic energy of the rotating shaft, not only the mixing effect of concentrated nitric acid and concentrated sulfuric acid is improved, but also no external driving source is required to save the use cost. At the same time, part of the heat generated by the mixing of concentrated nitric acid and concentrated sulfuric acid is released in the form of mechanical kinetic energy, which can reduce the amount of circulating cooling water required for the subsequent tubular heat exchanger, further reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a structural schematic diagram of a dinitrogen reaction batching and mixing production device of the present invention; Figure 2 It is a structural schematic diagram of a dinitro mixed acid mixer of the present invention; Figure 3 It is a structural schematic diagram of the transmission mechanism of the present invention; Figure 4 It is a structural schematic diagram of the heat drive mechanism of the present invention; Figure 5 It is a structural schematic diagram of the piston member of the present invention; Figure 6 It is a structural schematic diagram of the linkage member of the present invention; Figure 7 It is a schematic structural diagram of the cooling element of the present invention; Figure 8 It is a schematic diagram of the structure of the filter assembly of the present invention.

[0019] In the figure: 1, dinitrogen mixed acid mixer; 11, shell; 12, first feed pipe; 13, second feed pipe; 14, discharge pipe; 15, rotating shaft; 16, stirring blade; 17, transmission mechanism; 171, installation box; 172, installation rod; 173, first bevel gear; 174, second bevel gear; 175, first pulley; 18, thermal drive mechanism; 181, heat-conducting cylinder; 1811, heat-conducting fins; 182, sealing cylinder; 183, heat-sensitive gas; 184, piston member; 1841, piston; 1842, guide rod; 1843, Return spring; 185, air outlet pipe; 186, air outlet non-return valve; 187, air inlet pipe; 188, air inlet non-return valve; 189, cooling element; 1891, cooling box; 1892, partition; 1893, cooling fin; 180, linkage; 1801, fixing seat; 1802, cam; 1803, connecting rod; 1804, second pulley; 19, filter assembly; 191, filter screen; 192, scraper; 2, nitric acid pump; 3, concentrated nitric acid tank; 4, sulfuric acid pump; 5, concentrated sulfuric acid transfer tank; 6, tubular heat exchanger; 7, dinitrogen mixed acid tank. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0021] like Figure 1 to Figure 7 As shown, this embodiment proposes a dinitro reaction batching and mixing production device, including a dinitro mixed acid mixer 1, the dinitro mixed acid mixer 1 includes a shell 11, one end of the top of the shell 11 is fixedly connected to a first feed pipe 12 for introducing concentrated nitric acid, one end of the bottom of the shell 11 is fixedly connected to a second feed pipe 13 for introducing concentrated sulfuric acid, the outlet end of the shell 11 is fixedly connected to a discharge pipe 14 for discharging nitric and sulfuric mixed acid, the inner side of the shell 11 is rotatably connected to a rotating shaft 15, the outer side of the rotating shaft 15 is fixedly connected to a plurality of stirring blades 16, one end of the rotating shaft 15 is provided with a transmission mechanism 17, the transmission mechanism 17 includes an installation box 171, one side of the installation box 171 is fixedly connected to a plurality of installation rods 172 distributed at equal angles around the installation box 171, the ends of the plurality of installation rods 172 away from the installation box 171 are fixedly connected to the inner wall of the shell 11, the inner side of the installation box 171 is rotatably connected to a first bevel gear 173, one side of the first bevel gear 173 is connected to the rotating shaft 1 5 is fixedly connected, one end of the inner side of the installation box 171 is rotatably connected with a second bevel gear 174 meshing with the first bevel gear 173, the outer side of the housing 11 is rotatably connected with a first pulley 175 coaxially fixedly connected with the second bevel gear 174, one end of the housing 11 is provided with a heat drive mechanism 18 that absorbs the heat released by the reaction of concentrated nitric acid and concentrated sulfuric acid to drive the first pulley 175 to rotate, the inlet end of the first feed pipe 12 is fixedly connected with a nitric acid pump 2 through a conduit, the inlet end of the nitric acid pump 2 is fixedly connected with a concentrated nitric acid tank 3 through a conduit, the inlet end of the second feed pipe 13 is fixedly connected with a sulfuric acid pump 4 through a conduit, the inlet end of the sulfuric acid pump 4 is fixedly connected with a concentrated sulfuric acid transfer tank 5 through a conduit, the outlet end of the discharge pipe 14 is fixedly connected with a tubular heat exchanger 6 through a conduit, the inlet end of the tube side of the tubular heat exchanger 6 is connected with the discharge pipe 14, the shell side of the tubular heat exchanger 6 introduces circulating cooling water, and the outlet end of the tube side of the tubular heat exchanger 6 is fixedly connected with a dinitro mixed acid tank 7 through a conduit.

[0022] The concentrated nitric acid in the concentrated nitric acid tank 3 and the concentrated sulfuric acid in the concentrated sulfuric acid transfer tank 5 are metered and introduced into the shell 11 of the dinitro mixed acid mixer 1 according to a certain flow ratio for mixed acid treatment. The concentrated nitric acid and concentrated sulfuric acid will release heat when mixed, so that the temperature inside the shell 11 increases. The heat drive mechanism 18 can absorb the heat released by the reaction of the concentrated nitric acid and concentrated sulfuric acid to drive the first pulley 175 to rotate, which causes the second bevel gear 174 to rotate, so that the rotation of the rotating shaft 15 drives all the stirring blades 16 to rotate and stir the concentrated nitric acid and concentrated sulfuric acid, so that the two are quickly and fully mixed, thereby improving the efficiency of mixed acid. The whole process converts the heat energy released by the mixing of concentrated nitric acid and concentrated sulfuric acid into the mechanical kinetic energy of the rotation of the rotating shaft 15, which not only improves the mixing effect of concentrated nitric acid and concentrated sulfuric acid, but also does not require an external driving source to save the use cost. At the same time, part of the heat generated by the mixing of concentrated nitric acid and concentrated sulfuric acid is released in the form of mechanical kinetic energy, which can reduce the amount of circulating cooling water required for the subsequent tubular heat exchanger 6, further reducing the production cost.

[0023] Further, the heat drive mechanism 18 includes a heat-conducting tube 181, which is fixedly connected to one end of the shell 11, and a concentrically arranged sealing tube 182 is fixedly connected to the inner side of the heat-conducting tube 181, and one end of the heat-conducting tube 181 is fixedly connected to a plurality of heat-conducting fins 1811 that are distributed at equal angles around the heat-conducting tube 181, and the heat-conducting fins 1811 are located on the inner side of the shell 11, and the inner side of the sealing tube 182 is filled with a thermosensitive gas 183 at one end close to the shell 11, and a piston member 184 that moves under the action of the thermal expansion of the thermosensitive gas 183 is arranged on the inner side of the sealing tube 182, and a linkage member 180 that drives the first pulley 175 to rotate by cooperating with the movement of the piston member 184 is arranged on the outer side of the heat-conducting tube 181, and an outlet pipe 185 for guiding the thermosensitive gas 183 is fixedly connected to one end of the bottom of the sealing tube 182, and an outlet check valve 186 is fixedly connected to the outlet pipe 185. The other end of the bottom of the sealing cylinder 182 is fixedly connected with an air inlet pipe 187 for introducing the heat-sensitive gas 183, and the air inlet check valve 188 is fixedly connected to the air inlet pipe 187. A cooling member 189 for cooling the heat-sensitive gas 183 is arranged on the outer side of the heat-conducting cylinder 181, the outlet end of the air outlet pipe 185 is connected with the inlet end of the cooling member 189, and the inlet end of the air inlet pipe 187 is connected with the outlet end of the cooling member 189. The piston member 184 includes a piston 1841, and the piston 1841 is slidably connected to the inner wall of the sealing cylinder 182. One end of the sealing cylinder 182 is slidably connected with a guide rod 1842 that passes through the side wall of the sealing cylinder 182, and one end of the guide rod 1842 is fixedly connected to the piston 1841. A return spring 1843 is sleeved on the guide rod 1842, and one end of the return spring 1843 abuts against the piston 1841, and the other end of the return spring 1843 abuts against the inner wall of the sealing cylinder 182.

[0024] Concentrated nitric acid and concentrated sulfuric acid release heat when mixed, causing the temperature inside the shell 11 to rise. At the same time, the heat-conducting tube 181 transfers the heat inside the shell 11 to the sealing tube 182, causing the heat-sensitive gas 183 inside the sealing tube 182 to expand due to the heat. This causes the piston 1841 to slide under the pressure of the heat-sensitive gas 183, which causes the piston 1841 to overcome the elastic force of the return spring 1843 and move, causing the return spring 1843 to be compressed and accumulate elastic potential energy. When the piston 1841 moves to the position of the outlet pipe 185, the heat-sensitive gas 183 inside the sealing tube 182 is introduced into the outlet pipe 185. 85 and continue to be introduced into the cooling member 189 for cooling, and then the cooled thermosensitive gas 183 is re-introduced into the sealing tube 182 through the air inlet pipe 187. At this time, the volume of the low-temperature thermosensitive gas 183 shrinks and the force exerted on the piston 1841 is less than the elastic force of the return spring 1843, so that the piston 1841 slides in the opposite direction. When the temperature of the thermosensitive gas 183 rises and expands again and the pressure exerted on the piston 1841 is greater than the elastic force of the return spring 1843, the piston 1841 will overcome the elastic force of the return spring 1843 again to move, and the cycle is repeated. The piston 1841 can slide back and forth in the sealing tube 182.

[0025] Furthermore, the linkage member 180 includes a fixed seat 1801, which is fixedly connected to the outer side of the heat-conducting tube 181, and one side of the fixed seat 1801 is rotatably connected to a cam 1802, and the outer edge of the cam 1802 is rotatably connected to a connecting rod 1803 through a pin shaft, and one end of the connecting rod 1803 away from the cam 1802 is hinged to the end of the guide rod 1842, and the other side of the fixed seat 1801 is rotatably connected to a second pulley 1804 coaxially fixed with the cam 1802, and the second pulley 1804 is connected to the first pulley 175 through a belt drive. When the piston 1841 reciprocates, it drives the guide rod 1842 to slide back and forth, so that the connecting rod 1803 drives the cam 1802 to rotate, which makes the second pulley 1804 rotate, and the first pulley 175 drives the second bevel gear 174 to rotate synchronously, so that the first bevel gear 173 drives the rotating shaft 15 to rotate, thereby making all the stirring blades 16 rotate and stir the concentrated nitric acid and concentrated sulfuric acid to make the two fully mixed.

[0026] Furthermore, the cooling member 189 includes a cooling box 1891, one end of the cooling box 1891 is fixedly connected to the air outlet pipe 185, the other end of the cooling box 1891 is fixedly connected to the air inlet pipe 187, the inner side of the cooling box 1891 is fixedly connected with a plurality of partitions 1892 evenly distributed in the horizontal direction, the plurality of partitions 1892 are staggered up and down and form an S-shaped channel, the outer side of the cooling box 1891 is fixedly connected with a plurality of heat dissipation fins 1893 evenly distributed around the cooling box 1891.

[0027] Working principle: By starting the nitric acid pump 2 and the sulfuric acid pump 4, the concentrated nitric acid in the concentrated nitric acid tank 3 and the concentrated sulfuric acid in the concentrated sulfuric acid transfer tank 5 are metered and introduced into the shell 11 of the dinitro mixed acid mixer 1 according to a certain flow ratio for mixed acid treatment. The concentrated nitric acid and concentrated sulfuric acid will release heat when mixed, so that the temperature inside the shell 11 increases. At the same time, the heat-conducting cylinder 181 will transfer the heat inside the shell 11 to the sealing cylinder 182, so that the heat-sensitive gas 183 inside the sealing cylinder 182 expands due to the heat, which makes the piston 1841 slide under the gas pressure of the heat-sensitive gas 183, which also makes the piston 184 1 overcomes the elastic force of the return spring 1843 to move, so that the return spring 1843 is compressed and accumulates elastic potential energy. When the piston 1841 moves to the position of the outlet pipe 185, the thermosensitive gas 183 in the sealing cylinder 182 is introduced into the outlet pipe 185 and further introduced into the cooling box 1891. The heat of the thermosensitive gas 183 is extracted through the heat dissipation fins 1893 to exchange heat indirectly with the outside air, thereby cooling the thermosensitive gas 183. The cooled thermosensitive gas 183 is then re-introduced into the sealing cylinder 182 through the intake pipe 187. At this time, the low-temperature thermosensitive gas 183 is The force of the plug 1841 is smaller than the elastic force of the return spring 1843, so that the piston 1841 slides in the opposite direction. When the temperature of the thermosensitive gas 183 rises again and the pressure on the piston 1841 is greater than the elastic force of the return spring 1843, the piston 1841 will overcome the elastic force of the return spring 1843 again to move. In this cycle, the piston 1841 can slide back and forth in the sealing cylinder 182, so that the connecting rod 1803 drives the cam 1802 to rotate, which makes the second pulley 1804 rotate, and the first pulley 175 drives the second bevel gear 174 to rotate synchronously, so that the first bevel gear The wheel 173 drives the rotating shaft 15 to rotate, so that all the stirring blades 16 rotate and stir the concentrated nitric acid and concentrated sulfuric acid, so that the two are quickly and fully mixed, thereby improving the mixed acid efficiency. The whole process converts the heat energy released by the mixing of concentrated nitric acid and concentrated sulfuric acid into mechanical kinetic energy for the rotation of the rotating shaft 15, which not only improves the mixing effect of concentrated nitric acid and concentrated sulfuric acid, but also does not require an external driving source to save the use cost. At the same time, part of the heat generated by the mixing of concentrated nitric acid and concentrated sulfuric acid is released in the form of mechanical kinetic energy, which can reduce the amount of circulating cooling water required for the subsequent tubular heat exchanger 6, further reducing the production cost. Example

[0028] like Figure 1 to Figure 8 As shown, as another preferred embodiment of the present invention, the difference from Embodiment 1 lies in that a filter assembly 19 is provided at one end of the inner side of the shell 11, the filter assembly 19 comprises a filter screen 191 fixedly connected to the inside of the shell 11, and a scraper 192 is fixedly connected to one end of the rotating shaft 15, and the scraper 192 is slidably connected to the outer wall of the filter screen 191.

[0029] Working principle: by starting the nitric acid pump 2 and the sulfuric acid pump 4, the concentrated nitric acid in the concentrated nitric acid tank 3 and the concentrated sulfuric acid in the concentrated sulfuric acid transfer tank 5 are metered according to a certain flow ratio and introduced into the shell 11 of the dinitrogen mixed acid mixer 1 for mixed acid treatment. The filter 191 can filter the impurities in the nitric acid and sulfuric acid mixed acid. At the same time, the rotating shaft 15 will drive the scraper 192 to rotate during the rotation process, so that the scraper 192 cleans the outer wall of the filter 191, thereby avoiding the filter holes of the filter 191 from being blocked and affecting the discharge pipe 14 from discharging the nitric acid and sulfuric acid mixed acid.

[0030] The present invention also provides a dinitrate reaction batching and mixing production process, comprising the following steps: S1: Start the nitric acid pump 2 and the sulfuric acid pump 4, and introduce the concentrated nitric acid in the concentrated nitric acid tank 3 and the concentrated sulfuric acid in the concentrated sulfuric acid transfer tank 5 into the housing 11 of the dinitro mixed acid mixer 1 according to a certain flow ratio for mixed acid treatment; S2: Concentrated nitric acid and concentrated sulfuric acid release heat when mixed, causing the temperature inside the shell 11 to rise. At the same time, the heat-conducting tube 181 transfers the heat inside the shell 11 to the sealing tube 182, causing the thermal gas 183 inside the sealing tube 182 to expand due to the heat. This causes the piston 1841 to slide due to the air pressure of the thermal gas 183, which causes the piston 1841 to overcome the elastic force of the return spring 1843 to move, causing the return spring 1843 to be compressed and accumulate elastic potential energy. When the piston 1841 moves to the position of the outlet pipe 185, the thermal gas 183 inside the sealing tube 182 is introduced into the outlet pipe 185 and continues to be introduced into the cooling box 1891. The heat dissipation fins 1893 conduct heat dissipation of the thermosensitive gas 183 and exchange heat with the outside air indirectly, thereby cooling the thermosensitive gas 183. The cooled thermosensitive gas 183 is then reintroduced into the sealing tube 182 through the air inlet pipe 187. At this time, the force exerted by the low-temperature thermosensitive gas 183 on the piston 1841 is smaller than the elastic force of the return spring 1843, so that the piston 1841 slides in the reverse direction. When the temperature of the thermosensitive gas 183 rises again and the pressure exerted on the piston 1841 is larger than the elastic force of the return spring 1843, the piston 1841 will overcome the elastic force of the return spring 1843 again to move. In this cycle, the piston 1841 can slide back and forth in the sealing tube 182. S3: When the piston 1841 reciprocates, it drives the guide rod 1842 to slide back and forth, so that the connecting rod 1803 drives the cam 1802 to rotate, which makes the second pulley 1804 rotate, and the first pulley 175 drives the second bevel gear 174 to rotate synchronously, so that the first bevel gear 173 drives the rotating shaft 15 to rotate, so that all the stirring blades 16 rotate and stir the concentrated nitric acid and concentrated sulfuric acid to make the two fully mixed; S4: The nitric acid-sulfuric acid mixture is discharged into the tube side of the tubular heat exchanger 6 through the discharge pipe 14, and then circulating cooling water is introduced into the shell side of the tubular heat exchanger 6, so that the circulating cooling water indirectly cools the nitric acid-sulfuric acid mixture; S4: Finally, the nitric-sulfuric acid mixture flows from the outlet end of the tube pass of the tubular heat exchanger 6 into the dinitrogen mixed acid tank 7 by gravity, and then is introduced into the dinitrogen mixed acid high-level tank for standby use through an acid pump.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dinitrogen reaction batching and mixing production device, comprising a dinitrogen mixed acid mixer (1), the dinitrogen mixed acid mixer (1) comprising a shell (11), one end of the top of the shell (11) is fixedly connected to a first feed pipe (12) for introducing concentrated nitric acid, one end of the bottom of the shell (11) is fixedly connected to a second feed pipe (13) for introducing concentrated sulfuric acid, and the outlet end of the shell (11) is fixedly connected to a discharge pipe (14) for discharging nitric and sulfuric acid mixed acid, characterized in that: The inner side of the shell (11) is rotatably connected to a rotating shaft (15), and the outer side of the rotating shaft (15) is fixedly connected to a plurality of stirring blades (16). A transmission mechanism (17) is provided at one end of the rotating shaft (15), and the transmission mechanism (17) comprises an installation box (171), and one side of the installation box (171) is fixedly connected to a plurality of installation rods (172) that are distributed at equal angles around the installation box (171), and the ends of the plurality of installation rods (172) that are away from the installation box (171) are fixedly connected to the inner wall of the shell (11), and the installation box (171) is fixedly connected to the inner wall of the shell (11). A first bevel gear (173) is rotatably connected to the inner side, one side of the first bevel gear (173) is fixedly connected to the rotating shaft (15), one end of the inner side of the mounting box (171) is rotatably connected to a second bevel gear (174) meshing with the first bevel gear (173), the outer side of the housing (11) is rotatably connected to a first pulley (175) coaxially fixedly connected to the second bevel gear (174), and one end of the housing (11) is provided with a heat drive mechanism (18) for driving the first pulley (175) to rotate by absorbing heat released by the reaction of concentrated nitric acid and concentrated sulfuric acid.

2. A dinitro reaction batching and mixing production device according to claim 1, characterized in that: The inlet end of the first feed pipe (12) is fixedly connected to a nitric acid pump (2) via a conduit, and the inlet end of the nitric acid pump (2) is fixedly connected to a concentrated nitric acid tank (3) via a conduit; the inlet end of the second feed pipe (13) is fixedly connected to a sulfuric acid pump (4) via a conduit, and the inlet end of the sulfuric acid pump (4) is fixedly connected to a concentrated sulfuric acid transfer tank (5) via a conduit.

3. A dinitro reaction batching and mixing production device according to claim 2, characterized in that: The outlet end of the discharge pipe (14) is fixedly connected to the tubular heat exchanger (6) via a conduit, the inlet end of the tube side of the tubular heat exchanger (6) is connected to the discharge pipe (14), circulating cooling water is introduced into the shell side of the tubular heat exchanger (6), and the outlet end of the tube side of the tubular heat exchanger (6) is fixedly connected to the dinitrogen mixed acid tank (7) via a conduit.

4. A dinitro reaction batching and mixing production device according to claim 1, characterized in that: The thermal drive mechanism (18) comprises a heat-conducting tube (181), the heat-conducting tube (181) being fixedly connected to one end of the housing (11), a sealing tube (182) being fixedly connected to the inner side of the heat-conducting tube (181) being coaxially arranged, an inner side of the sealing tube (182) close to the end of the housing (11) being filled with a heat-sensitive gas (183), a piston member (184) being arranged on the inner side of the sealing tube (182) being movable under the action of thermal expansion of the heat-sensitive gas (183), a linkage member (180) being arranged on the outer side of the heat-conducting tube (181) being arranged to drive the first pulley (175) to rotate by cooperating with the movement of the piston member (184), and a bottom of the sealing tube (182) being provided with a piston member (184) being arranged to move under the action of thermal expansion of the heat-sensitive gas (183). One end of the sealing tube (182) is fixedly connected to an outlet pipe (185) for discharging the heat-sensitive gas (183), and an outlet check valve (186) is fixedly connected to the outlet pipe (185). The other end of the bottom of the sealing tube (182) is fixedly connected to an inlet pipe (187) for introducing the heat-sensitive gas (183), and an inlet check valve (188) is fixedly connected to the inlet pipe (187). A cooling element (189) for cooling the heat-sensitive gas (183) is provided on the outside of the heat-conducting tube (181). The outlet end of the outlet pipe (185) is connected to the inlet end of the cooling element (189), and the inlet end of the inlet pipe (187) is connected to the outlet end of the cooling element (189).

5. A dinitro reaction batching and mixing production device according to claim 4, characterized in that: One end of the heat-conducting tube (181) is fixedly connected to a plurality of heat-conducting fins (1811) that are distributed at equal angles and surround the heat-conducting tube (181), and the heat-conducting fins (1811) are located on the inner side of the shell (11).

6. A dinitro reaction batching and mixing production device according to claim 4, characterized in that: The piston member (184) comprises a piston (1841), wherein the piston (1841) is slidably connected to the inner wall of the sealing cylinder (182), one end of the sealing cylinder (182) is slidably connected to a guide rod (1842) penetrating the side wall of the sealing cylinder (182), one end of the guide rod (1842) is fixedly connected to the piston (1841), a return spring (1843) is sleeved on the guide rod (1842), one end of the return spring (1843) contacts the piston (1841), and the other end of the return spring (1843) contacts the inner wall of the sealing cylinder (182).

7. A dinitro reaction batching and mixing production device according to claim 6, characterized in that: The linkage member (180) comprises a fixed seat (1801), the fixed seat (1801) is fixedly connected to the outside of the heat-conducting tube (181), one side of the fixed seat (1801) is rotatably connected to a cam (1802), the outer edge of the cam (1802) is rotatably connected to a connecting rod (1803) via a pin, one end of the connecting rod (1803) away from the cam (1802) is hinged to the end of a guide rod (1842), the other side of the fixed seat (1801) is rotatably connected to a second pulley (1804) coaxially fixed to the cam (1802), and the second pulley (1804) is connected to the first pulley (175) via a belt drive.

8. A dinitro reaction batching and mixing production device according to claim 4, characterized in that: The cooling component (189) includes a cooling box (1891), one end of the cooling box (1891) is fixedly connected to the air outlet pipe (185), and the other end of the cooling box (1891) is fixedly connected to the air inlet pipe (187); the inner side of the cooling box (1891) is fixedly connected to a plurality of partitions (1892) equidistantly distributed in the horizontal direction; the plurality of partitions (1892) are staggered up and down to form an S-shaped channel; the outer side of the cooling box (1891) is fixedly connected to a plurality of heat dissipation fins (1893) equidistantly distributed around the cooling box (1891).

9. A dinitro reaction batching and mixing production device according to claim 1, characterized in that: A filter assembly (19) is provided at one end of the inner side of the housing (11), the filter assembly (19) comprising a filter screen (191) fixedly connected to the inside of the housing (11), a scraper (192) is fixedly connected to one end of the rotating shaft (15), and the scraper (192) is slidably connected to the outer wall of the filter screen (191).

10. A dinitrification reaction batching and mixing production process, which is realized by the dinitrification reaction batching and mixing production device according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: starting the nitric acid pump (2) and the sulfuric acid pump (4), and introducing the concentrated nitric acid in the concentrated nitric acid tank (3) and the concentrated sulfuric acid in the concentrated sulfuric acid transfer tank (5) into the housing (11) of the dinitrogen mixed acid mixer (1) at a certain flow rate ratio for mixed acid treatment; S2: When concentrated nitric acid and concentrated sulfuric acid are mixed, they release heat, causing the temperature inside the shell (11) to rise. At the same time, the heat-conducting tube (181) transfers the heat inside the shell (11) to the sealing tube (182), causing the thermosensitive gas (183) inside the sealing tube (182) to expand due to the heat. This causes the piston (1841) to slide due to the gas pressure of the thermosensitive gas (183), which causes the piston (1841) to overcome the elastic force of the return spring (1843) and move, causing the return spring (1843) to be compressed and accumulate elastic potential energy. When the piston (1841) moves to the position of the outlet pipe (185), the thermosensitive gas (183) inside the sealing tube (182) is introduced into the outlet pipe (185) and continues to be introduced into the cooling box (1891), through The heat dissipation fins (1893) conduct heat dissipation of the thermosensitive gas (183) to exchange heat indirectly with the outside air, thereby cooling the thermosensitive gas (183). The cooled thermosensitive gas (183) is then reintroduced into the sealing tube (182) through the air inlet pipe (187). At this time, the force exerted by the low-temperature thermosensitive gas (183) on the piston (1841) is smaller than the elastic force of the return spring (1843), causing the piston (1841) to slide in the opposite direction. When the temperature of the thermosensitive gas (183) rises again and the pressure exerted on the piston (1841) is larger than the elastic force of the return spring (1843), the piston (1841) will overcome the elastic force of the return spring (1843) and move again. In this cycle, the piston (1841) can slide back and forth in the sealing tube (182). S3: When the piston (1841) reciprocates, it drives the guide rod (1842) to slide back and forth, so that the connecting rod (1803) drives the cam (1802) to rotate, which causes the second pulley (1804) to rotate, and the first pulley (175) drives the second bevel gear (174) to rotate synchronously, so that the first bevel gear (173) drives the rotating shaft (15) to rotate, thereby causing all the stirring blades (16) to rotate and stir the concentrated nitric acid and concentrated sulfuric acid, so that the two are fully mixed; S4: discharging the nitric acid-sulfuric acid mixture into the tube side of the tubular heat exchanger (6) through the discharge pipe (14), and then introducing circulating cooling water into the shell side of the tubular heat exchanger (6), so that the circulating cooling water indirectly cools the nitric acid-sulfuric acid mixture; S4: Finally, the nitric-sulfuric acid mixture flows from the outlet end of the tube side of the tubular heat exchanger (6) into the dinitrogen mixed acid tank (7), and then is introduced into the dinitrogen mixed acid high-level tank for standby use through an acid pump.

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