CN115501825A - Melamine one-step production system capable of realizing multi-stage utilization of crude liquid - Google Patents

Abstract

The invention provides a melamine one-step production system for multi-stage utilization of crude liquid, which comprises a preheater, wherein the output end of the preheater is connected with a fluidized reaction bed, and the output end of the fluidized reaction bed is sequentially connected with a primary crystallizer, a cyclone separator, a filter, a secondary crystallizer and a crystal collecting mechanism; inlets of the two groups of exhaust detection assemblies are communicated with the heat source outlet pipe, exhaust ports of the two groups of exhaust detection assemblies are communicated to an exhaust pipe, and an outlet of the exhaust pipe is communicated to the secondary condensation tank; the inlet of the third cold source supply pipe is communicated with the second-stage condensing tank. The invention can fully utilize the primary condenser and the crude liquid in multiple stages, and the whole system can work continuously and circularly, thereby greatly reducing the production energy consumption; release partly high temperature gas, liquid through exhaust detection subassembly, can share the cooling pressure of one-level condensing pot, can guarantee the condensation effect of one-level condensing pot to gas-liquid mixture.

Description

Melamine one-step production system capable of realizing multi-stage utilization of Taoist liquid

Technical Field

The invention relates to the technical field of melamine preparation, in particular to a one-step melamine production system for multi-stage utilization of crude liquid.

Background

At present, the mainstream production method of melamine ammonia is one-step production, and the production steps are as follows: preheating gas to 230-280 ℃ through a preheater, and then feeding preheated ammonia gas into a fluidized bed to react with liquid urea flowing through the fluidized bed, wherein the reaction temperature is 382-395 ℃; introducing mixed gas containing melamine generated by reaction into a primary crystallizer, cooling the mixed gas to 312-328 ℃, and cooling and crystallizing impurities with higher boiling points in the mixed gas to form crystallized impurities; then the mixed gas enters a cyclone separator and a filter in sequence, so that crystallized impurities are filtered; the mixed gas enters a secondary crystallizer, the temperature of the mixed gas is reduced to 220-240 ℃, and melamine is cooled and crystallized; the mixed gas with the melamine crystals enters a crystal collecting mechanism, and the melamine crystals are collected; cooling the primary crystallizer is realized by heat exchange of the road raw liquid, the road raw liquid is biphenyl-diphenyl ether, then the road raw gas after heat exchange enters a condenser again, so that the road raw gas is converted into the road raw liquid, and the road raw liquid is supplied to the primary crystallizer in a recycling manner;

in the production process, the heat exchange system has the following problems:

1. the heating of the preheater and the cooling of the secondary cooler still need to be provided with separate heat exchange equipment, the utilization rate of the crude liquid is limited, and the power consumption of a heat exchange system is higher;

2. the direct road gas generation pressure of discharging from the one-level crystallizer is easy too high, high pressure easily leads to cooling coil pipe junction gas leakage on the one hand, and on the other hand, the workman need cut off the time and open discharge valve gassing, and above-mentioned two condition are passive exhaust, can't control the road gas generation in the production, and simultaneously, the road gas generation in direct discharge workshop can cause the harm to the workman is healthy, also causes the waste of the road gas generation.

In summary, there is a need for a melamine one-step production system with low power consumption of heat exchange system and capable of avoiding air pollution caused by regenerated gas.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a melamine one-step production system for multistage utilization of crude liquid, and solves the problems in the background art.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the melamine one-step production system for multi-stage utilization of the crude liquid comprises a preheater, wherein the output end of the preheater is connected with a fluidized reaction bed, and the output end of the fluidized reaction bed is sequentially connected with a primary crystallizer, a cyclone separator, a filter, a secondary crystallizer and a crystal collecting mechanism;

the air inlet of the preheating pipe is communicated with the heat source inlet pipe, and the air outlet of the preheating pipe is communicated with the heat source outlet pipe; the water inlet of the primary crystallizer is communicated with a first cold source inlet pipe, the water outlet of the primary crystallizer is communicated with a first cold source outlet pipe, the water inlet of the secondary crystallizer is communicated with a second cold source inlet pipe, the water outlet of the secondary crystallizer is communicated with a second cold source outlet pipe, and the first cold source outlet pipe and the second cold source outlet pipe are connected in parallel to the heat source inlet pipe; the inlet of the first cold source inlet pipe is connected with a first cold source supply pipe and a third cold source supply pipe in parallel, the inlet of the second cold source inlet pipe is communicated with a second cold source supply pipe, the inlet ends of the first cold source supply pipe and the second cold source supply pipe are communicated with a primary condensing tank, and the inlet end of the third cold source supply pipe is communicated with a secondary condensing tank;

a first cooling coil and a second cooling coil are arranged in the first-stage condensing tank, the outlet of the first cooling coil is communicated with a first cold source supply pipe, and the inlet of the first cooling coil is communicated with a liquid discharge port of an exhaust detection assembly; the outlet of the second cooling coil is communicated with the second cold source supply pipe, and the inlet of the second cooling coil is communicated with a liquid outlet of the other exhaust detection component; inlets of the two groups of exhaust detection assemblies are communicated with the heat source outlet pipe, exhaust ports of the two groups of exhaust detection assemblies are communicated to an exhaust pipe, and an outlet of the exhaust pipe is communicated to the secondary condensation tank; the inlet of the third cold source supply pipe is communicated with the second-stage condensing tank;

the low-temperature channel raw liquid is discharged to the primary crystallizer through the first cold source supply pipe and the third cold source supply pipe, and the low-temperature channel raw liquid is discharged to the secondary crystallizer through the second cold source supply pipe for cooling and heat exchange; heating the low-temperature channel raw liquid after heat exchange to convert the low-temperature channel raw liquid into channel raw gas, heating the preheater by the channel raw gas through a heat source inlet pipe, and discharging a gas-liquid mixture in a heat source outlet pipe into a primary condensing tank for cooling; when the air pressure in the gas-liquid mixture exceeds a threshold value, the exhaust detection assembly opens the exhaust, so that the redundant gas is discharged into the secondary condensation tank for cooling.

Further, the top of the inside of the secondary condensing tank is a cold water cavity, the bottom of the inside of the secondary condensing tank is a liquid storage cavity, a third cooling coil is arranged in the cold water cavity, the inlet end of the third cooling coil is communicated with the exhaust pipe, the outlet of the third cooling coil is communicated with the liquid storage cavity, and the liquid storage cavity is communicated with a third cold source supply pipe through a liquid pump; and cold water cavities of the first-stage condensation tank and the second-stage condensation tank are both circularly communicated with the cold water tank.

Further, exhaust detection subassembly is the L type including detecting the box, detects the box, and the horizontal part that detects the box is transfusion cavity, vertical part and is the exhaust chamber, and the elasticity separation subassembly is installed with the junction in transfusion cavity to the exhaust chamber, and the one end intercommunication heat source exit tube in transfusion cavity, the first cooling coil of other end intercommunication or second cooling coil.

Furthermore, a second partition plate is arranged on the inner wall of the detection box, a first partition plate is arranged in the middle of the inner part of the infusion cavity, a third partition plate is arranged at the bottom of the inner part of the exhaust cavity, and the third partition plate is arranged right above the first partition plate at intervals; the lower part of the second clapboard is arranged opposite to the first clapboard at intervals, the upper part of the second clapboard is arranged opposite to the third clapboard at intervals, and the interval area is an exhaust channel; one side of the first partition board is a first flow guide cavity, the other side of the first partition board is a third flow guide cavity, and an area between the first partition board and the third partition board is a second flow guide cavity;

the bottom end of the elastic separation assembly is matched and sealed with the exhaust channel, the first flow guide cavity, the second flow guide cavity and the third flow guide cavity are communicated in an inverted U shape, and the bottom end of the exhaust channel is communicated with the first flow guide cavity and the second flow guide cavity.

Furthermore, the inner diameter of the first diversion cavity is gradually reduced towards the direction of the exhaust channel, the bottom surface of the second partition plate is provided with an air isolating plate, the air isolating plate is arranged in the middle of the second diversion cavity, and the included angle between the upstream surface of the air isolating plate and the second partition plate is an acute angle.

Furthermore, the elastic separation assembly comprises a sealing head, a second floating rod and a fixed rod, the bottom surface of the sealing head is of a hemispherical structure, and the inner walls of the second partition plate and the third partition plate are provided with concave cambered surface structures matched with the sealing head; the top surface of the sealing head is provided with a second floating rod, and the top end of the second floating rod is arranged in the exhaust cavity through a fixing rod.

Further, the secondary crystallizer includes the outer jar of body, the internally mounted of the outer jar of body has U type pipe, and U type pipe and filter, crystal collection mechanism, the outer wall of the outer jar of body are equipped with the cooling cover, and the cooling cover goes into pipe, second cold source exit tube intercommunication with the second cold source, the central line department of the outer jar of body is equipped with the puddler, and the external connection of puddler has first patting subassembly, second to pat the subassembly, and first patting subassembly is used for two vertical portions of flexible patting U type pipe, and the second is patted the subassembly and is used for the flexible U type refrigerated arc part of patting.

Furthermore, the crystal collecting mechanism comprises a main collecting box, a crystal screening component, a transfer pipe, an air duct and an auxiliary collecting box; the bottom of transit pipe is equipped with main collecting box, the top is equipped with vice collecting box, and the lateral wall of transit pipe communicates the material pipe perpendicularly, and the vertical slidable mounting in the inside of transit pipe has the air duct, and the air duct communicates with main collecting box or vice collecting box, and crystal screening subassembly is installed in main collecting box.

Furthermore, the crystal screening assembly is of an inside-out exhaust structure, one end of the crystal screening assembly is of an open structure, the bottom surface of the main collection box body is provided with a discharge hole, and the crystal screening assembly is in a material receiving state and a material discharging state;

receiving the material: the crystal screening component is in a vertical state, the gas guide pipe is jacked up by the crystal screening component, and the material pipe, the gas guide pipe and the crystal screening component are communicated;

and (3) discharging state: the crystal screening assembly rotates to an inclined downward state, the opening structure faces the discharge port, the air guide pipe moves downward to reset, and the material pipe, the air guide pipe and the auxiliary collecting box are communicated.

The invention provides a one-step melamine production system for multi-stage utilization of crude liquid. Compared with the prior art, the method has the following beneficial effects:

1. according to the design of the heat exchange system, two groups of cooling coils are adopted, the cooling temperature of the first cooling coil is higher than that of the second cooling coil, so that a primary condensing tank can output two types of ballast liquid with different temperatures, the ballast liquid with a slightly higher temperature is supplied to a primary crystallizer, the ballast liquid with a lower temperature is supplied to a secondary crystallizer, and gas after heat exchange is transmitted into the preheater for preheating; therefore, the full multi-stage utilization of the primary condenser and the crude liquid is realized, the whole system can work circularly and continuously, and the production energy consumption is greatly reduced;

2. the design of exhaust detection subassembly in this application has following effect: the traditional passive air leakage can be changed into active air leakage, so that air leakage at each connection part of the cooling coil caused by overhigh air pressure can be avoided, and the working stability of the cooling coil is ensured; when the mixed liquid is at an overhigh temperature, the gas pressure is overhigh, part of high-temperature gas and liquid is released through the exhaust detection assembly, the cooling pressure of the first-stage condensing tank can be shared, and the condensing effect of the first-stage condensing tank on the gas-liquid mixture can be ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a schematic diagram of a production system of melamine by one-step process with multistage utilization of the crude liquid according to the present invention;

FIG. 2 shows a schematic diagram of a first stage condensate tank configuration of the present invention;

FIG. 3 shows a schematic view of the exhaust detection assembly of the present invention;

FIG. 4 is a schematic view showing the distribution structure of the first and third separators of the present invention;

FIG. 5 shows a schematic view of the construction of the elastic barrier assembly of the present invention;

FIG. 6 is a schematic view showing a circulation supply structure of a cold water tank according to the present invention;

FIG. 7 shows a schematic diagram of the secondary crystallizer structure of the present invention;

FIG. 8 is a schematic view showing the structure of the outer wall of the stirring spindle according to the present invention;

FIG. 9 shows an enlarged schematic view of the structure at A of FIG. 7;

FIG. 10 shows a schematic of the crystal collection mechanism of the present invention;

FIG. 11 shows a schematic view of the airway structure of the present invention;

FIG. 12 shows a schematic of the crystal screen assembly of the present invention;

FIG. 13 is a schematic showing the crystal screen assembly discharge configuration of the present invention;

shown in the figure: 1. a preheater; 11. introducing a heat source into the pipe; 12. a heat source outlet pipe; 2. a fluidized reaction bed; 3. a primary crystallizer; 31. a first cold source inlet pipe; 32. a first cold source outlet pipe; 4. a cyclone separator; 5. a filter; 6. a secondary crystallizer; 61. an outer tank body; 62. a cooling jacket; 63. a U-shaped pipe; 64. a stirring main shaft; 641. a retaining ring; 642. a stirring rod; 643. a first bevel gear; 65. a first beating belt; 66. a second flapping component; 661. a second taper tooth; 662. a transmission rod; 663. a support bar; 664. a second beating belt; 67. a second cold source inlet pipe; 68. a second cold source outlet pipe; 69. a material pipe; 7. a crystal collection mechanism; 71. a main collection tank; 711. a discharge port; 72. a crystal screening assembly; 721. an inner screening cover; 722. an outer screening housing; 723. turning over a motor; 724. a fan box; 73. a reset assembly; 731. a first float lever; 732. a sealing plate; 74. a transit tube; 75. a gas-guide tube; 751. a lower pipe body; 7511. a first retainer ring; 7512. a first air inlet; 752. a baffle plate; 753. feeding a pipe body; 7531. a second air inlet; 7532. a second retainer ring; 7533. a third retainer ring; 754. bending the pipe; 76. a secondary collection box; 8. a first-stage condensing tank; 81. an exhaust pipe; 82. a first cooling coil; 83. an exhaust gas detection assembly; 831. a detection cartridge; 8311. a first flow guide cavity; 8312. an exhaust passage; 8313. a second diversion cavity; 8314. a third flow guide cavity; 8315. a return air hole; 832. a first separator; 833. a second separator; 834. a third separator; 8341. a gas barrier; 835. an elastomeric barrier component; 8351. a sealing head; 8352. a second float lever; 8353. fixing the rod; 84. a second cooling coil; 85. a first cold source supply pipe; 86. a second cold source supply pipe; 9. a second-stage condensing tank; 91. a cold water chamber; 911. a third cooling coil; 92. a liquid storage cavity; 93. a third cold source supply pipe; 9a and a cold water tank.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

Example one

In order to solve the technical problems in the background art, the following melamine one-step production system for multi-stage utilization of crude liquid is provided:

with reference to fig. 1 to 6, the melamine one-step production system for multistage utilization of crude liquid provided by the present invention comprises a preheater 1, wherein an output end of the preheater 1 is connected to a fluidized reaction bed 2, and an output end of the fluidized reaction bed 2 is sequentially connected to a primary crystallizer 3, a cyclone separator 4, a filter 5, a secondary crystallizer 6, and a crystal collection mechanism 7;

in order to cool the primary crystallizer 3 and the secondary crystallizer 6 and heat the preheater 1, the following crude liquid multi-stage utilization structure is provided in this embodiment:

the air inlet of the preheating pipe is communicated with a heat source inlet pipe 11, and the air outlet of the preheating pipe is communicated with a heat source outlet pipe 12; a water inlet of the primary crystallizer 3 is communicated with a first cold source inlet pipe 31, a water outlet of the primary crystallizer is communicated with a first cold source outlet pipe 32, a water inlet of the secondary crystallizer 6 is communicated with a second cold source inlet pipe 67, a water outlet of the secondary crystallizer is communicated with a second cold source outlet pipe 68, and the first cold source outlet pipe 32 and the second cold source outlet pipe 68 are connected in parallel to the heat source inlet pipe 11; the inlet of the first cold source inlet pipe 31 is connected in parallel with a first cold source supply pipe 85 and a third cold source supply pipe 93, the inlet of the second cold source inlet pipe 67 is communicated with a second cold source supply pipe 86, the inlet ends of the first cold source supply pipe 85 and the second cold source supply pipe 86 are both communicated with the primary condensing tank 8, and the inlet end of the third cold source supply pipe 93 is communicated with the secondary condensing tank 9;

a first cooling coil 82 and a second cooling coil 84 are installed inside the first-stage condensation tank 8, an outlet of the first cooling coil 82 is communicated with a first cold source supply pipe 85, and an inlet is communicated with a liquid outlet of an exhaust detection component 83; the outlet of the second cooling coil 84 is communicated with the second cold source supply pipe 86, and the inlet is communicated with the liquid outlet of the other exhaust gas detection assembly 83; inlets of the two groups of exhaust detection components 83 are communicated with the heat source outlet pipe 12, exhaust ports of the two groups of exhaust detection components 83 are communicated to the exhaust pipe 81, and an outlet of the exhaust pipe 81 is communicated to the secondary condensing tank 9; the inlet of the third cold source supply pipe 93 is communicated with the second-stage condensing tank 9;

the top of the interior of the secondary condensation tank 9 is a cold water cavity 91, the bottom of the interior is a liquid storage cavity 92, a third cooling coil 911 is installed in the cold water cavity 91, the inlet end of the third cooling coil 911 is communicated with the exhaust pipe 81, the outlet of the third cooling coil is communicated to the liquid storage cavity 92, and the liquid storage cavity 92 is communicated to a third cold source supply pipe 93 through a liquid pump; the cold water cavities 91 of the first-stage condensation tank 8 and the second-stage condensation tank 9 are both circularly communicated with the cold water tank 9 a;

the liquid storage cavity 92 of the first-stage condensation tank 8 and the cooling water in the second-stage condensation tank 9 are both in circulating communication with the cooling water tank.

The temperature of the gas-liquid mixture discharged from the heat source outlet pipe 12 is 300-320 ℃, the temperature of the gas-liquid mixture is reduced to 300-310 ℃ by the first cooling coil 82 and the third cooling coil 911, and the temperature of the gas-liquid mixture is reduced to 230-240 ℃ by the second cooling coil 84.

The low-temperature channel raw liquid is discharged to the primary crystallizer 3 through the first cold source supply pipe 85 and the third cold source supply pipe 93, and the low-temperature channel raw liquid is discharged to the secondary crystallizer 6 through the second cold source supply pipe 86 for cooling and heat exchange; the low-temperature channel crude liquid after heat exchange is heated and converted into channel crude gas, the channel crude gas heats the preheater 1 through the heat source inlet pipe 11, and a gas-liquid mixture in the heat source outlet pipe 12 is discharged into the first-stage condensing tank 8 to be cooled; when the air pressure in the gas-liquid mixture exceeds a threshold value, the exhaust detection component 83 opens exhaust, so that redundant channel generated gas is discharged into the secondary condensing tank 9 for cooling;

through the design of the heat exchange system, two groups of cooling coils are adopted, the cooling temperature of the first cooling coil 82 is higher than that of the second cooling coil 84, so that the primary condensing tank 8 can output two kinds of crude liquid with different temperatures, the crude liquid with the slightly higher temperature is supplied to the primary crystallizer 3, the crude liquid with the lower temperature is supplied to the secondary crystallizer 6, and the gas after heat exchange is transmitted into the preheater 1 for preheating; therefore, the full multi-stage utilization of the primary condenser and the crude liquid is realized, the whole system can work circularly and continuously, and the production energy consumption is greatly reduced;

the design of the exhaust gas detection assembly 83 has the following effects:

1. the traditional passive air release can be changed into active air release, so that air leakage at each connecting part of the cooling coil caused by overhigh air pressure can be avoided, and the working stability of the cooling coil is ensured;

2. when the mixed liquid is too high in temperature, the mixed liquid can also cause the gas pressure to be too high, part of high-temperature gas and liquid is released through the exhaust detection assembly 83, the cooling pressure of the first-stage condensation tank 8 can be shared, and the condensation effect of the first-stage condensation tank 8 on the gas-liquid mixture can be guaranteed.

In order to enable the exhaust detection component 83 to realize the above air pressure detection function, the exhaust detection component 83 needs to complete air pressure detection while normally guiding liquid to the first-stage condensation tank 8, and the following structural design is specifically provided:

as shown in fig. 3 and 4, the exhaust detection assembly 83 includes a detection box 831, the detection box 831 is L-shaped, a horizontal portion of the detection box 831 is an infusion chamber, a vertical portion of the detection box 831 is an exhaust chamber, an elastic blocking assembly 835 is installed at a connection between the exhaust chamber and the infusion chamber, one end of the infusion chamber is communicated with the heat source outlet pipe 12, and the other end of the infusion chamber is communicated with the first cooling coil 82 or the second cooling coil 84; a second partition plate 833 is arranged on the inner wall of the detection box 831, a first partition plate 832 is installed in the middle of the inner part of the infusion cavity, a third partition plate 834 is arranged at the bottom of the inner part of the exhaust cavity, and the third partition plate 834 is arranged right above the first partition plate 832 at intervals; the lower part of the second clapboard 833 is arranged opposite to the first clapboard 832 at intervals, the upper part of the second clapboard 833 is arranged opposite to the third clapboard 834 at intervals, and the interval area is an exhaust channel 8312; one side of the first partition 832 is a first diversion cavity 8311, the other side is a third diversion cavity 8314, and the area between the first partition 832 and the third partition 834 is a second diversion cavity 8313; the bottom end of the elastic blocking component 835 is matched and sealed with an exhaust channel 8312, the first flow guide cavity 8311, the second flow guide cavity 8313 and the third flow guide cavity 8314 are communicated in an inverted U shape, and the bottom end of the exhaust channel 8312 is communicated with the first flow guide cavity 8311 and the second flow guide cavity 8313.

The top of the outer wall of the detection box 831 is provided with an air return hole 8315, and the air return hole 8315 is distributed at the top of the inner part of the first-stage condensation tank 8 and is positioned above the liquid level of the first-stage condensation tank 8.

Through the design of above-mentioned first baffle 832, second baffle 833, third baffle 834, can be with whole infusion chamber design for U type structure, so for the gas-liquid mixture upwards gets into exhaust passage 8312 through first water conservancy diversion chamber 8311 certainly, when atmospheric pressure is big, then the elastic seal subassembly that pushes up, redundant gas is discharged, and liquid is exported through second water conservancy diversion chamber 8313, third water conservancy diversion chamber 8314 afterwards, when atmospheric pressure is not enough, then the gas-liquid mixture directly exports through second water conservancy diversion chamber 8313, third water conservancy diversion chamber 8314.

As an improvement of the above technical solution, the inner diameter of the first diversion cavity 8311 gradually decreases toward the exhaust passage 8312, the bottom surface of the second partition 833 is provided with an air barrier 8341, the air barrier 8341 is arranged in the middle of the second diversion cavity 8313, and an included angle between the upstream surface of the air barrier 8341 and the second partition 833 is an acute angle;

the gas barrier 8341 is designed to block gas from the upper part, so that high-pressure gas is prevented from flowing into the third flow guide cavity 8314, and the outflow of high-pressure gas and liquid is ensured; the shape of the upper portion of the first flow guide cavity 8311 is designed to increase the flow velocity and the water pressure, so that the upper jacking force of the gas-liquid mixture is larger, and the detection effect is better.

As shown in fig. 5, as an improvement of the above technical solution, the elastic blocking component 835 includes a sealing head 8351, a second floating rod 8352 and a fixing rod 8353, a bottom surface of the sealing head 8351 is a hemispherical structure, and inner walls of the second partition plate 833 and the third partition plate 834 are both provided with concave arc surface structures matched with the sealing head 8351; a second floating rod 8352 is arranged on the top surface of the sealing head 8351, and the top end of the second floating rod 8352 is arranged in the exhaust cavity through a fixing rod 8353;

the concave cambered surface structure can be matched with the sealing head 8351, and the sealing head 8351 is pushed by a high-pressure gas-liquid mixture, so that the sealing head 8351 moves upwards to leave the second partition plate 833 and the third partition plate 834, and rapid exhaust is realized; the second floating rod 8352 comprises a support rod, a sleeve and a spring, wherein the support rod is embedded in the sleeve in a sliding mode, and the spring is installed in the sleeve.

Example two

Because the cooling jacket 62 is arranged outside the outer tank body 61, therefore, the cooling effect of the secondary crystallizer 6 is limited, and simultaneously, the crystallized melamine crystals are easy to be detained in the air duct 75 in the secondary crystallizer 6, and the subsequent cleaning is troublesome, and for solving the above problems, the design of the secondary crystallizer 6 is given as follows in the embodiment:

as shown in fig. 7-9, the secondary crystallizer 6 includes an outer tank 61, a U-shaped pipe 63, a filter 5 and a crystal collecting mechanism 7 are installed inside the outer tank 61, a cooling cover 62 is installed on an outer wall of the outer tank 61, the cooling cover 62 is communicated with a second cold source inlet pipe 67 and a second cold source outlet pipe 68, a stirring rod 642 is installed at a central line of the outer tank 61, a first flapping assembly and a second flapping assembly 66 are connected to the outside of the stirring rod 642, the first flapping assembly is used for flexibly flapping two vertical portions of the U-shaped pipe 63, and the second flapping assembly 66 is used for flexibly flapping an arc portion of the U-shaped cooling.

The first flapping assembly comprises a stirring main shaft 64 and a first flapping belt 65, wherein the outer wall of the stirring main shaft 64 is symmetrically provided with stirring rods 642 and retaining rings 641, the two retaining rings 641 and the two stirring rods 642 are distributed in a cross shape, the outer side of each retaining ring 641 is connected with the first flapping belt 65 in a buckling manner, and the first flapping belt 65 is arranged on the inner side of the vertical part of the U-shaped pipe 63;

the second flapping assembly 66 comprises a second bevel gear 661, a transmission rod 662, a support rod 663 and a second flapping belt 664; the bottom end of the stirring main shaft 64 is provided with a first bevel gear 643, the first bevel gear 643 is vertically meshed with the second bevel gear 661, a transmission rod 662 is arranged on the outer side of the second bevel gear 661, the transmission rod 662 is arranged on the upper portion of the arc-shaped portion of the U-shaped pipe 63, the other end, away from the second bevel gear 661, of the transmission rod 662 is rotatably connected with a supporting rod 663, and the supporting rod 663 is fixedly arranged in the outer tank body 61.

The design of the air guide of the U-shaped pipe 63 is adopted, so that the time of the air flowing through the secondary crystallizer 6 can be prolonged, and the contact surface is increased; when the stirring main shaft 64 rotates, the stirring rod 642 is driven to rotate, the transmission rod 662 is driven to rotate through the first bevel gear 643 and the second bevel gear 661, the first beating belt 65 and the second beating belt 664 are driven to rotate, and therefore gas in the outer tank body 61 is driven to disturb, cold air is distributed uniformly, and the cooling effect is improved; the first beating belt 65 rotates horizontally to beat the vertical part of the U-shaped pipe 63, and the second beating belt 664 rotates vertically to beat the arc-shaped part of the U-shaped pipe 63, so that melamine crystals are prevented from being retained in the U-shaped pipe 63, the melamine crystals can be discharged quickly, and the subsequent cleaning difficulty is reduced.

EXAMPLE III

In order to realize the rapid collection, the full collection and the rapid discharge of melamine crystals, the following structural design is provided:

as shown in fig. 10 and fig. 11, the crystal collecting mechanism 7 comprises a main collecting box 71, a crystal screening assembly 72, a transfer pipe 74, an air duct 75 and an auxiliary collecting box 76; the bottom end of the transit pipe 74 is provided with a main collecting box 71, the top end of the transit pipe 74 is provided with an auxiliary collecting box 76, the side wall of the transit pipe 74 is vertically communicated with the material pipe 69, the interior of the transit pipe 74 is vertically and slidably provided with an air duct 75, the air duct 75 is communicated with the main collecting box 71 or the auxiliary collecting box 76, and the crystal screening component 72 is arranged in the main collecting box 71.

The main collecting box 71 is a main screening and collecting area of melamine crystals, when the main collecting box 71 is full and needs to discharge materials, the air duct 75 moves, the air duct 75 is communicated with the auxiliary collecting box 76, therefore, in the material discharging process, the melamine crystals temporarily enter the auxiliary collecting box, after the material discharging is finished, the air duct 75 resets again, and the air duct 75 is communicated with the main collecting box 71, so that the normal discharging and collecting of the melamine crystals are not influenced in the material discharging process.

The crystal screening assembly 72 is of an inside-out exhaust structure, one end of the crystal screening assembly 72 is of an open structure, and a discharge hole 711 is formed in the bottom surface of the main collection box 71; by adopting the structure, the crystal screening component 72 can screen melamine crystals to the maximum extent and has high recovery efficiency.

As shown in fig. 10 and 12, the crystal screening assembly 72 comprises an inner screening cover 721, an outer screening cover 722, a turnover motor 723 and a fan box 724; the outer screening cover 722 is of a cuboid box structure with an open top, an inner screening cover 721 is arranged at the center of the outer screening cover 722, object placing gaps are reserved between the periphery of the inner screening cover 721 and the outer screening cover 722, the inner screening cover 721 is of a cuboid box structure with an open top, the open end of the inner screening cover 721 is flush with the open end of the outer screening cover 722, and the inner screening cover 721 and the outer screening cover 722 are both of mesh structures; the bottom of the outer screening cover 722 is provided with a fan box 724 at intervals, and four corners of the fan box 724 are connected with the outer screening cover 722 into a whole; the overturning motor 723 is fixedly arranged on the inner wall of the main collecting box 71, and the output end of the overturning motor 723 is connected to the center of the bottom surface of the outer screening cover 722;

the structural design of above-mentioned interior screening cover 721, outer screening cover 722 can realize straining to the two-stage of melamine crystalline solid, and screening efficiency is high, and the back that finishes is filtered simultaneously, and the melamine crystalline solid can be stored in interior screening cover 721, outer screening cover 722, and multistage screening, storage go on in step.

As shown in fig. 10 and fig. 11, the air duct 75 includes an air duct 75 and a reset assembly 73, the reset assembly 73 includes first floating rods 731 and a sealing plate 732, the first floating rods 731 have the same structure as the second floating rods 8352, two groups of first floating rods 731 are provided, two groups of first floating rods 731 are symmetrically provided on the inner top surface of the main collection box 71, two groups of first floating rods 731 are symmetrically provided on both sides of the air duct 75, the movable ends of the bottom ends of the two groups of first floating rods 731 are vertically connected to the sealing plate 732, and the bottom surface of the sealing plate 732 is glued with a sealing pad;

through the matching design of the reset component 73 and the overturning motor 723, the floating action of the air duct 75 can be synchronous with the overturning processes of the inner screening cover 721 and the outer screening cover 722, and a floating driving structure of the guide pipe 75 does not need to be designed independently; the sealing gasket design can improve the joint sealing performance of the sealing plate 732, the inner screening cover 721 and the outer screening cover 722;

when the inner screening cover 721 and the outer screening cover 722 are in a vertical state, the inner screening cover 721 and the outer screening cover 722 are attached and sealed with the sealing plate 732 and abut against the upper top of the sealing plate 732 to compress the reset component 73, the inner screening cover 721 is opposite to the gas guide tube 75, so that melamine crystals are directly discharged to the inner screening cover 721, and redundant melamine crystals are screened and filtered in the outer screening cover 722;

when full, upset motor 723 drives interior screening cover 721, the upset of outer screening cover 722 for interior screening cover 721, the slope of outer screening cover 722 are arranged the material, and when interior screening cover 721, outer screening cover 722 rotated to vertical state, closing plate 732 no longer received the interference force, so, reset assembly 73 resets, and reset assembly 73 drives closing plate 732, air duct 75 synchronous downstream.

As shown in fig. 10 and 11, the air duct 75 includes a lower tube 751, a baffle 752, an upper tube 753, and an elbow 754, wherein the upper tube 753 is disposed on the top surface of the baffle 752, the lower tube 751 is disposed on the bottom surface of the baffle 752, the first baffle ring 7511 is disposed on the outer wall of the lower tube 751, the second baffle ring 7532 and the third baffle ring 7533 are disposed on the outer wall of the upper tube 753, the third baffle ring 7533 is disposed above the second baffle ring 7532 at intervals, the outer diameters of the baffle 752, the first baffle ring 7511, and the second baffle ring 7532 are all the same, the baffle 752, the first baffle ring 7511, and the second baffle ring 7532 are all attached to and slide on the inner wall of the transit tube 74, the distance between the second baffle ring 7532 and the baffle 752 is the same as the distance between the first baffle ring 7511 and the baffle ring, the upper tube 751 is disposed between the second baffle ring 7532 and the baffle 7531, the area of the lower tube 751 is the first inlet 7512, the top end of the upper tube 754 extends into the auxiliary collection box 76, the outer diameter of the third baffle ring 753 is greater than the inner diameter of the inner collection box, and the inner diameter of the elbow 753 is less than the inner diameter of the inner collection box of the lower tube 753, and the upper tube 753.

The design of the plurality of baffle rings can divide the interior of the transit pipe 74 into a plurality of independent air feeding chambers, and the conveying position of the crystal is changed by the lifting action of the air duct 75, so that the switching between the main collecting box 71 and the auxiliary collecting box 76 is realized.

In the implementation of the embodiment, the crystal collecting mechanism 7 has two states of material receiving and material discharging;

as shown in fig. 10, the receiving state is as follows: the top ends of the outer screening cover 722 and the inner screening cover 721 can compress the first floating rod 731, the top surfaces of the outer screening cover 722 and the inner screening cover 721 are both attached and sealed with sealing gaskets, the outlet of the lower pipe 751 is aligned with the inner screening cover 721, the baffle 752 is arranged above the material pipe 69, the first baffle ring 7511 is arranged below the material pipe 69, and the material pipe 69 is aligned with the first air inlet 7512;

the mixed gas of melamine crystals enters the inner screening cover 721 through the material pipe 69, the first air inlet 7512 and the lower pipe 751, then the mixed gas sequentially passes through the inner screening cover 721 and the outer screening cover 722, the melamine crystals are retained in the inner screening cover 721 and the object placing gap, and the air is finally discharged from the discharge port 711;

as shown in fig. 13, the discharge state: when the inner screening cover 721 and the outer screening cover 722 are filled with melamine crystals, the overturning motor 723 drives the whole crystal screening assembly 72 to rotate downwards by 45 degrees, so that the inner screening cover 721 and the outer screening cover 722 are aligned to the discharge hole 711;

in the overturning process, the first floating rod 731 resets to drive the sealing plate 732 to move downwards, the sealing plate 732 drives the air guide pipe 75 to slide downwards along the transit pipe 74, the second blocking ring 7532 is placed above the material pipe 69, the blocking plate 752 is located below the material pipe 69, the second air inlet 7531 is aligned with the material pipe 69, and the third blocking ring 7533 blocks the sealing pair collection box 76; the mixed gas of the melamine crystals enters the auxiliary collecting box 76 through the material pipe 69, the second gas inlet 7531 and the upper pipe 753, then the mixed gas enters the auxiliary collecting box 76 through the elbow 754, and the melamine crystals are retained in the auxiliary collecting box 76;

crystals in the inner screening cover 721 and the outer screening cover 722 are obliquely discharged downwards to the discharge port 711, and the blanking fan 724 is started, so that the crystals in the inner screening cover 721 and the outer screening cover 722 are further blown out, and quick discharge is realized;

after discharging is finished, the overturning motor 723 drives the crystal screening assembly 72 to rotate upwards and reset, and the inner screening cover 721 and the outer screening cover 722 push the air duct 75 upwards again to return to the material receiving state.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. The melamine one-step method production system of saying living liquid multistage utilization, its characterized in that: the system comprises a preheater, wherein the output end of the preheater is connected with a fluidized reaction bed, and the output end of the fluidized reaction bed is sequentially connected with a primary crystallizer, a cyclone separator, a filter, a secondary crystallizer and a crystal collecting mechanism;

the air inlet of the preheating pipe is communicated with the heat source inlet pipe, and the air outlet of the preheating pipe is communicated with the heat source outlet pipe; the water inlet of the primary crystallizer is communicated with a first cold source inlet pipe, the water outlet of the primary crystallizer is communicated with a first cold source outlet pipe, the water inlet of the secondary crystallizer is communicated with a second cold source inlet pipe, the water outlet of the secondary crystallizer is communicated with a second cold source outlet pipe, and the first cold source outlet pipe and the second cold source outlet pipe are connected in parallel to the heat source inlet pipe; the inlet of the first cold source inlet pipe is connected with a first cold source supply pipe and a third cold source supply pipe in parallel, the inlet of the second cold source inlet pipe is communicated with a second cold source supply pipe, the inlet ends of the first cold source supply pipe and the second cold source supply pipe are communicated with a primary condensing tank, and the inlet end of the third cold source supply pipe is communicated with a secondary condensing tank;

a first cooling coil and a second cooling coil are arranged in the first-stage condensing tank, the outlet of the first cooling coil is communicated with a first cold source supply pipe, and the inlet of the first cooling coil is communicated with a liquid outlet of an exhaust detection assembly; the outlet of the second cooling coil is communicated with the second cold source supply pipe, and the inlet of the second cooling coil is communicated with a liquid discharge port of the other exhaust detection assembly; inlets of the two groups of exhaust detection assemblies are communicated with a heat source outlet pipe, exhaust ports of the two groups of exhaust detection assemblies are communicated to an exhaust pipe, and an outlet of the exhaust pipe is communicated to a secondary condensing tank; the inlet of the third cold source supply pipe is communicated with the second-stage condensing tank;

the low-temperature channel raw liquid is discharged to the primary crystallizer through the first cold source supply pipe and the third cold source supply pipe, and the low-temperature channel raw liquid is discharged to the secondary crystallizer through the second cold source supply pipe for cooling and heat exchange; heating the low-temperature channel raw liquid after heat exchange to convert the low-temperature channel raw liquid into channel raw gas, heating the preheater by the channel raw gas through a heat source inlet pipe, and discharging a gas-liquid mixture in a heat source outlet pipe into a primary condensing tank for cooling; when the air pressure in the gas-liquid mixture exceeds a threshold value, the exhaust detection assembly opens the exhaust, so that the redundant gas is discharged into the secondary condensation tank for cooling.

2. The melamine one-step production system for multi-stage utilization of ballast according to claim 1, wherein: the top of the interior of the second-stage condensation tank is a cold water cavity, the bottom of the interior of the second-stage condensation tank is a liquid storage cavity, a third cooling coil is arranged in the cold water cavity, the inlet end of the third cooling coil is communicated with the exhaust pipe, the outlet of the third cooling coil is communicated to the liquid storage cavity, and the liquid storage cavity is communicated to a third cold source supply pipe through a liquid pump; and cold water cavities of the first-stage condensation tank and the second-stage condensation tank are both circularly communicated with the cold water tank.

3. The one-step melamine production system for multistage utilization of ballast according to claim 1, wherein: the exhaust detection assembly comprises a detection box, the detection box is L-shaped, the horizontal part of the detection box is a transfusion cavity, the vertical part of the detection box is an exhaust cavity, an elastic blocking assembly is installed at the joint of the exhaust cavity and the transfusion cavity, and one end of the transfusion cavity is communicated with a heat source outlet pipe and the other end of the transfusion cavity is communicated with a first cooling coil or a second cooling coil.

4. The melamine one-step production system for multi-stage utilization of ballast according to claim 3, wherein: a second partition plate is arranged on the inner wall of the detection box, a first partition plate is arranged in the middle of the interior of the infusion cavity, a third partition plate is arranged at the bottom of the interior of the exhaust cavity, and the third partition plate is arranged right above the first partition plate at intervals; the lower part of the second clapboard is arranged opposite to the first clapboard at intervals, the upper part of the second clapboard is arranged opposite to the third clapboard at intervals, and the interval area is an exhaust channel; one side of the first partition board is a first flow guide cavity, the other side of the first partition board is a third flow guide cavity, and the area between the first partition board and the third partition board is a second flow guide cavity;

the bottom end of the elastic separation component is matched and sealed with the exhaust channel, the first flow guide cavity, the second flow guide cavity and the third flow guide cavity are communicated in an inverted U shape, and the bottom end of the exhaust channel is communicated with the first flow guide cavity and the second flow guide cavity.

5. The one-step melamine production system for multi-stage utilization of ballast according to claim 4, wherein: the inner diameter of the first diversion cavity is gradually reduced towards the direction of the exhaust channel, the bottom surface of the second partition plate is provided with an air baffle plate, the air baffle plate is arranged in the middle of the second diversion cavity, and the included angle between the upstream surface of the air baffle plate and the second partition plate is an acute angle.

6. The one-step melamine production system for multi-stage utilization of ballast according to claim 5, wherein: the elastic separation assembly comprises a sealing head, a second floating rod and a fixed rod, the bottom surface of the sealing head is of a hemispherical structure, and the inner walls of the second partition plate and the third partition plate are provided with concave cambered surface structures matched with the sealing head; the top surface of the sealing head is provided with a second floating rod, and the top end of the second floating rod is arranged in the exhaust cavity through a fixing rod.

7. The melamine one-step production system for multi-stage utilization of ballast according to claim 1, wherein: the secondary crystallizer includes the outer jar of body, the internally mounted of the outer jar of body has U type pipe, and U type pipe is collected the mechanism with filter, crystal, and the outer wall of the outer jar of body is equipped with the cooling cover, and the cooling cover is gone into tub, second cold source exit tube intercommunication with the second cold source, the central line department of the outer jar of body is equipped with the puddler, and the external connection of puddler has first patting subassembly, second to pat the subassembly, and first patting subassembly is used for two vertical portions of flexible patting U type pipe, and the second is patted the subassembly and is used for the flexible U type refrigerated arc part of patting.

8. The melamine one-step production system for multi-stage utilization of ballast according to claim 1, wherein: the crystal collecting mechanism comprises a main collecting box, a crystal screening component, a transfer pipe, an air guide pipe and an auxiliary collecting box; the bottom of transit pipe is equipped with main collecting box, the top is equipped with vice collecting box, and the lateral wall of transit pipe communicates the material pipe perpendicularly, and the vertical slidable mounting in the inside of transit pipe has the air duct, and the air duct communicates with main collecting box or vice collecting box, and crystal screening subassembly is installed in main collecting box.

9. The melamine one-step production system for multi-stage utilization of ballast according to claim 8, wherein: the crystal screening assembly is of an inside-out exhaust structure, one end of the crystal screening assembly is of an open structure, a discharge hole is formed in the bottom surface of the main collection box body, and the crystal screening assembly has two states of material receiving and material discharging;

material receiving state: the crystal screening assembly is in a vertical state, the gas guide pipe is jacked by the crystal screening assembly, and the material pipe, the gas guide pipe and the crystal screening assembly are communicated;

and (3) discharging state: the crystal screening assembly rotates to an inclined downward state, the opening structure faces the discharge port, the air guide pipe moves downward to reset, and the material pipe, the air guide pipe and the auxiliary collecting box are communicated.

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