Piperazine product granulation system
The piperazine product granulation system uses countercurrent contact cooling to granulate piperazine slurry into piperazine particles, solving the transportation and quality problems caused by the high freezing point of piperazine products and achieving efficient product processing and quality assurance.
Patent Information
- Application Number
- CN202422624864.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Piperazine products have a high freezing point, which makes liquid transportation difficult, and the quality of solid piperazine products is hard to guarantee and there is a lot of loss, resulting in reduced efficiency of existing treatment methods.
The piperazine product granulation system uses a granulation tower and a nitrogen circulation unit to countercurrently contact and cool the piperazine slurry into granules. Nitrogen purification and finned coolers are used to purify and cool the circulating nitrogen to form piperazine particles.
It effectively avoids product loss during solid piperazine packaging, ensures product quality, and solves the problem of difficult handling for users.
Smart Images
Figure CN223517455U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to piperazine processing technical field, specifically relates to a piperazine product granulation system. BACKGROUND
[0002] Due to the high freezing point of piperazine, the market mainstream circulation mode is divided into 68 piperazine and solid piperazine, 68 piperazine is mainly configured with water 68% piperazine aqueous solution, the freezing point of the mixture is reduced, and liquid transportation can be carried out, the solid piperazine on the market is mainly in the form of barrel solid piperazine or piperazine slice, the 68% piperazine aqueous solution is difficult for the manufacturer to handle, the product quality of barrel solid piperazine is difficult to guarantee, and the piperazine slice product is large in loss, and the benefit is damaged.
[0003] The piperazine product has the characteristics of high freezing point and good fluidity, and can be suitable for granulation packaging. SUMMARY
[0004] In view of the defects in the prior art, the utility model aims at providing a piperazine product granulation system and a granulation method, which directly granulate pure piperazine to obtain pure piperazine granules.
[0005] To achieve the above object, the utility model adopts the technical scheme of a piperazine product granulation system, which comprises a granulation tower and a nitrogen circulation unit, piperazine slurry is connected to the feed inlet at the top of the granulation tower through a feed pump and a feed pipeline, the piperazine slurry forms fine droplets and falls by being sprayed through a spray gun at the feed inlet, circulating nitrogen of the nitrogen circulation unit enters from the air inlet at the bottom of the granulation tower, and the circulating nitrogen countercurrently contacts and cools and granulates the fine droplets of the piperazine slurry, the circulating nitrogen is discharged from the air outlet at the top of the granulation tower, and then enters the air inlet at the bottom of the granulation tower again after being sequentially connected to a nitrogen purification unit, a nitrogen fan and a cooling unit through a nitrogen circulation pipeline.
[0006] Further, the bottom of the granulation tower is provided with a conical hopper for buffering and placing piperazine granules, a bottom plug valve is arranged at the outlet of the hopper, and the piperazine granules in the hopper enter a packaging machine for bagging through the bottom plug valve periodically; the bottom of the granulation tower is provided with an air hammer and a nitrogen blowing pipeline of the granulation tower.
[0007] Further, the spray gun is connected to the feed pipeline through a detachable short connection, a saturated steam inlet pipeline and a steam condensate outlet pipeline are connected to the top interface of the spray gun, and the spray gun is connected to the saturated steam inlet pipeline and the steam condensate outlet pipeline through a hose respectively.
[0008] Further, a control valve group is arranged on the feed pipeline, a nitrogen pressure line is connected to the feed pipeline through a three-way electromagnetic valve, and the three-way electromagnetic valve is arranged downstream of the control valve group; a return material branch line is connected to the feed pipeline and connected to the upstream piperazine slurry container; the feed pipeline, the nitrogen pressure line, the return material branch line, and the spray gun are all provided with steam heating pipelines.
[0009] Further, the nitrogen purification unit comprises a bag filter and a high-efficiency filter arranged in sequence, the piperazine powder cleaned from the filter bag of the bag filter falls into the bottom of the bag filter, enters the lower material pipeline below the bottom plug valve of the prilling tower through a first manual plug valve, a rotary valve, and a second manual plug valve, and the bottom of the bag filter is provided with a bag filter nitrogen blowing pipeline; the filtered and purified circulating nitrogen enters the high-efficiency filter through the top of the bag filter, and two high-efficiency filters are arranged in parallel.
[0010] Further, the filtered and purified circulating nitrogen of the nitrogen purification unit is discharged through the nitrogen circulating pipeline connected to the cooling unit after passing through a nitrogen fan; a nitrogen discharge pipeline and a nitrogen supplement pipeline are connected to the nitrogen circulating pipeline, the inlet of the nitrogen discharge pipeline is connected to the nitrogen circulating pipeline downstream of the nitrogen fan, the outlet of the nitrogen discharge pipeline leads to an area outside the boundary, and fresh nitrogen from the boundary is connected to the nitrogen circulating pipeline downstream of the nitrogen fan through the nitrogen supplement pipeline and mixed with the circulating nitrogen before entering the cooling unit.
[0011] Further, a pressure control valve is arranged on the nitrogen discharge pipeline, an oxygen content control valve is arranged on the nitrogen supplement pipeline, the nitrogen pressure in the nitrogen supplement pipeline is 0.4 MPaG, and the outlet pipe section of the nitrogen supplement pipeline is obliquely inserted into the nitrogen circulating pipeline at an inclination angle of not less than 60°.
[0012] Further, the cooling unit adopts a fin cooler, the circulating nitrogen to be cooled enters the fin cooler, cooling water and coolant water flowing in the fin cooler exchange heat with the circulating nitrogen in countercurrent, and the cooled circulating nitrogen enters the air inlet at the bottom of the prilling tower.
[0013] Further, the shell side of the fin cooler is connected to the nitrogen circulating pipeline, and the tube side of the fin cooler is connected to a cooling water pipeline network and a coolant water pipeline network; the inlet temperature of the cooling water is 31℃, and the cooling water returns to the cooling water pipeline network after heat exchange; the inlet temperature of the coolant water is 6℃, and the coolant water returns to the coolant water pipeline network after heat exchange.
[0014] The piperazine slurry from the upstream feeding pump with pressure 0.7 MPaG and temperature 140 DEG C is fed into the top feeding port of the prilling tower, and is sprayed to form fine droplets by the spray gun, and is contacted with the circulating nitrogen gas with 10 DEG C from the bottom air inlet of the prilling tower in countercurrent to cool and prill, and the prilled piperazine powder is stored in the hopper at the bottom of the prilling tower, and the material in the hopper is regularly fed into the packing machine through the bottom plug valve to be packed, and the circulating nitrogen gas containing the piperazine powder is discharged from the top air outlet of the prilling tower and enters the bag-type dust collector, and the circulating nitrogen gas containing the piperazine powder is pulse cleaned in the bag-type dust collector, and the piperazine powder cleaned from the filter bag of the bag-type dust collector falls into the bottom of the bag-type dust collector, and sequentially passes through the first manual plug valve, the rotary valve, the second manual plug valve and the downpipe line under the bottom plug valve of the prilling tower, and the bottom of the bag-type dust collector is swept by the nitrogen gas blowing pipeline of the bag-type dust collector to prevent the powder from accumulating on the wall surface, and the filtered and purified nitrogen gas enters the high-efficiency filter for dust removal and purification, and the high-efficiency filter is one standby for another, and the circulating nitrogen gas purified by the high-efficiency filter is discharged by the nitrogen gas fan and is discharged to the fin cooler through the nitrogen gas circulating pipeline, and part of the circulating nitrogen gas is discharged to the boundary area through the nitrogen gas discharge pipeline from the nitrogen gas circulating pipeline through the pressure control valve, and the fresh nitrogen gas with 0.4 MPaG from the boundary area enters the nitrogen gas circulating pipeline through the oxygen content control valve and is mixed with the circulating nitrogen gas and then enters the fin cooler, and the circulating nitrogen gas to be cooled with 48 DEG C enters the shell side of the fin cooler, and the cooling water with inlet water temperature 31 DEG C and the refrigerant water with inlet water temperature 6 DEG C are respectively introduced into the tube side of the fin cooler to exchange heat with the circulating nitrogen gas in countercurrent, and the cooled circulating nitrogen gas with 10 DEG C enters the air inlet of the prilling tower to cool and prill the piperazine liquid, and the heat-exchanged cooling water and refrigerant water are respectively returned to the cooling water pipeline system and the refrigerant water pipeline system.
[0015] The utility model discloses a kind of output modes of solid piperazine, which effectively avoids the shortcoming that product loss is relatively large when solid piperazine is packed, and the utility model also avoids the shortcoming that solid barrel piperazine user handles difficultly, which guarantees product quality and avoids excessive product loss. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the first part schematic diagram (prilling tower and bag-type dust collector pipeline connection relationship) for piperazine product prilling system;
[0017] Figure 2 It is Figure 1 Unsigned diagram;
[0018] Figure 3 It is Figure 1 Figure 2 Connection control diagram of spray gun in A place;
[0019] Figure 4The second part of the piperazine product granulation system schematic diagram (high efficiency filter, nitrogen fan and fin cooler pipeline connection relationship);
[0020] Figure 5 The Figure 4 unsigned diagram is shown in the figure;
[0021] Figure 6 The symbol explanation in the figure is shown;
[0022] Figure 7 The Figure 1 and Figure 4 pipeline and instrument abbreviation symbol explanation in the figure is shown;
[0023] In the figure: 1, the granulation tower, 1.1 the spray gun;
[0024] 2, the nitrogen circulation unit, 2.1 the first nitrogen circulation pipeline, 2.2 the second nitrogen circulation pipeline, 2.3 the third nitrogen circulation pipeline, 2.4 the fourth nitrogen circulation pipeline, 2.5 the fifth nitrogen circulation pipeline;
[0025] 3, the bag type dust collector, 4, the high efficiency filter, 5, the nitrogen fan, 6, the fin cooler, 7, the feeding pipeline, 8, the air hammer, 9, the granulation tower nitrogen blowing pipeline, 10, the bottom plug valve, 11, the detachable short circuit, 12, the saturated steam inlet pipeline, 13, the steam condensate outlet pipeline, 14, the hose, 15, the control valve group, 16, the three-way electromagnetic valve, 17, the nitrogen pressure line, 18, the return material branch line, 19, the discharging pipeline, 20, the first manual plug valve, 21, the rotary valve, 22, the second manual plug valve, 23, the nitrogen discharge pipeline, 24, the nitrogen supplement pipeline, 24.1 the nitrogen supplement pipeline outlet pipe section, 25, the pressure control valve, 26, the oxygen content control valve, 27, the bag type dust collector nitrogen blowing pipeline. DETAILED DESCRIPTION
[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent, easy to understand, the specific implementation of the utility model is explained in detail below. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.
[0027] Referring to the accompanying Figures 1-7, the piperazine product prilling system, including prilling tower 1 and nitrogen circulation unit, piperazine slurry is connected to the feed inlet of the top of the prilling tower 1 through the feed pump and the feed pipeline 7, the piperazine slurry is sprayed to form fine droplets and falls through the spray gun 1.1 at the feed inlet, the circulating nitrogen of the nitrogen circulation unit 2 enters from the air inlet at the bottom of the prilling tower, and the circulating nitrogen is in countercurrent contact with the fine droplets of the piperazine slurry, and the circulating nitrogen is discharged from the air outlet at the top of the prilling tower 1, and then enters the air inlet at the bottom of the prilling tower 1 again through the nitrogen circulation pipeline 2 connected in turn with the bag dust collector 3, the high-efficiency filter 4, the nitrogen fan 5 and the fin cooler 6.
[0028] Based on the above technical scheme, the nitrogen circulation pipeline 2 includes a first nitrogen circulation pipeline 2.1, a second nitrogen circulation pipeline 2.2, a third nitrogen circulation pipeline 2.3, a fourth nitrogen circulation pipeline 2.4 and a fifth nitrogen circulation pipeline 2.5, the air outlet at the top of the prilling tower 1 is connected to the inlet of the bag dust collector 3 through the first nitrogen circulation pipeline 2.1, the top outlet of the bag dust collector 3 is connected to the inlet of the high-efficiency filter 4 through the second nitrogen circulation pipeline 2.2, the outlet of the high-efficiency filter 4 is connected to the inlet of the nitrogen fan 5 through the third nitrogen circulation pipeline 2.3, the outlet of the nitrogen fan 5 is connected to the shell side nitrogen inlet of the fin cooler 6 through the fourth nitrogen circulation pipeline 2.4, and the shell side nitrogen outlet of the fin cooler 6 is connected to the air inlet at the bottom of the prilling tower through the fifth nitrogen circulation pipeline 2.5.
[0029] Further, the bottom of the prilling tower 1 is provided with a conical hopper for buffering the piperazine particles, a bottom plug valve 10 is arranged at the outlet of the hopper, and the piperazine particles in the hopper are periodically introduced into the packaging machine through the bottom plug valve 10 and the discharge pipeline 19; the bottom of the prilling tower 1 is provided with an air hammer 2.1 and a prilling tower nitrogen blowing pipeline 9. The air hammer 2.1 is uniformly arranged along the circumferential surface of the conical hopper at the bottom of the prilling tower 1.
[0030] Based on the above technical scheme, a separate bin is generally arranged behind the prilling tower in a normal prilling system, and in this embodiment, the independent bin is cancelled, and an integrated hopper is formed at the bottom of the prilling tower, the hopper can store 6m³ of material, which is basically the output of a single shift, thereby avoiding unnecessary labor consumption.
[0031] Further, the spray gun 2.1 is connected to the feed pipeline 7 through a detachable short circuit 11; a saturated steam inlet pipeline 12 and a steam condensate outlet pipeline 13 are connected to the top interface of the spray gun, and the spray gun 2.1 is connected with the saturated steam inlet pipeline 12 and the steam condensate outlet pipeline 13 through a hose 14 respectively.
[0032] Based on the above technical scheme, the detachable short circuit 11 is at least 600 mm long, and a clamp sleeve is separately matched to facilitate the disassembly of the spray gun and the replacement of the nozzle. The spray gun is provided with a plurality of nozzles, each nozzle is connected to the saturated steam inlet pipeline 12 and the steam condensate outlet pipeline 13 through a soft pipe 14, which facilitates the disassembly of the spray gun, the cleaning and replacement of the spray gun, and the saturated steam inlet pipeline 12 and the steam condensate outlet pipeline 13 are used to individually heat the spray gun, and a flange connection is provided to avoid the freezing of the spray gun due to the reduction of the temperature of the spray gun.
[0033] Further, the feed pipeline 7 sends the piperazine slurry in the upstream piperazine slurry container to the prilling tower 1, a control valve group 15 is arranged on the feed pipeline 7, a nitrogen pressure line 17 is connected to the feed pipeline 7 through a three-way electromagnetic valve 16, and the three-way electromagnetic valve 16 is arranged downstream of the control valve group 15; The feed pipeline 7 is connected with a return branch 18, the return branch 18 is connected to the upstream piperazine slurry container; The feed pipeline 7, the nitrogen pressure line 17, the return branch 18 and the spray gun 1.1 are all provided with a steam heating pipeline.
[0034] Based on the above technical scheme, all valves on the steam heating pipeline are clamped sleeve valves, clamped sleeve pipes and clamped sleeve reducers. The main function of the nitrogen pressure line 17 is to keep the overall operating pressure of the prilling tower system at about 10 kPa. If the system is over-pressurized, the piperazine feed is cut off. In order to prevent the piperazine in the inlet pipeline from freezing, the three-way valve is switched to the nitrogen side pipeline to blow the material in the pipeline into the tower.
[0035] Further, the piperazine powder cleaned from the filter bag of the bag-type dust collector 3 falls into the bottom of the bag-type dust collector, enters the lower pipeline 19 under the bottom plug valve 10 of the prilling tower 1 through the first manual plug valve 20, the rotary valve 21 and the second manual plug valve 22, and the bottom of the bag-type dust collector 3 is provided with a bag-type dust collector nitrogen blowing pipeline 27; The filtered and purified circulating nitrogen enters the high-efficiency filter 4 through the top of the bag-type dust collector 3, and two high-efficiency filters 4 are arranged in parallel, one for standby and one for use, so as to facilitate the replacement of the filter element.
[0036] The piperazine prilling adopts nitrogen countercurrent contact and cooling prilling. The prilled piperazine particles enter the hopper at the bottom of the prilling tower 1, the material in the hopper is periodically fed into the packaging machine through the bottom plug valve 10, and the piperazine in the circulating gas is uniformly fed into the prilling tower 1 through the bag-type dust collector 3 for pulse dust cleaning and recycling.
[0037] Furthermore, the circulating nitrogen purified by the nitrogen purification unit is discharged by the nitrogen blower 5 and then connected to the finned cooler 6 through the fourth nitrogen circulation pipeline 2.4. The fourth nitrogen circulation pipeline 2.4 is connected to the nitrogen discharge pipeline 23 and the nitrogen replenishment pipeline 24. The inlet of the nitrogen discharge pipeline 23 is connected to the fourth nitrogen circulation pipeline 2.4 downstream of the nitrogen blower 5, and the outlet of the nitrogen discharge pipeline 23 is led to the outside of the boundary area. Fresh nitrogen from the boundary area is connected to the fourth nitrogen circulation pipeline 2.4 downstream of the nitrogen blower through the nitrogen replenishment pipeline 24, and after mixing with the circulating nitrogen, it enters the finned cooler 6.
[0038] Furthermore, a pressure control valve 25 is installed on the nitrogen discharge pipeline 23. The pressure control valve 25 is controlled by a signal linkage with the pressure monitoring alarm on the first nitrogen circulation pipeline 2.1. An oxygen content control valve 26 is installed on the nitrogen replenishment pipeline 24. The oxygen content control valve 26 is controlled by a signal linkage with the oxygen content monitoring alarm on the third nitrogen circulation pipeline 2.3. The nitrogen pressure in the nitrogen replenishment pipeline 24 is 0.4 MPaG. The outlet section 24.1 of the nitrogen replenishment pipeline is obliquely inserted into the horizontal section of the fourth nitrogen circulation pipeline 2.4 before the inlet of the finned cooler. The inclination angle of the outlet section 24.1 of the nitrogen replenishment pipeline is not less than 60° to facilitate better and more timely air mixing.
[0039] Furthermore, the shell side of the finned cooler 6 is connected to the nitrogen circulation pipeline 2, and the circulating nitrogen to be cooled enters the shell side of the finned cooler. The tube side of the finned cooler 6 is connected to the cooling water pipeline and the refrigerant water pipeline. The cooling water and refrigerant water flowing in the finned cooler exchange heat with the circulating nitrogen in a countercurrent manner. The inlet temperature of the cooling water is 31°C, and after heat exchange, it returns to the cooling water pipeline. The inlet temperature of the refrigerant water is 6°C, and after heat exchange, it returns to the refrigerant water pipeline. The cooled circulating nitrogen enters the air inlet at the bottom of the granulation tower.
[0040] Work process: such as Figure 1 , Figure 3As shown, the liquid piperazine material from the upstream feed pump (operating conditions 0.7 MPaG, temperature 140°C) enters the top feed port of the prilling tower 1 (T-3501) through the three-way electromagnetic valve 16 (3501-XV-350101), and the feed port is connected with a detachable spray gun for replacing the nozzle. The piperazine feed line 7 and the nozzle are both heated. The liquid material is sprayed into the prilling tower 1 (T-3501) through the nozzle, and is in countercurrent contact with the 10°C or so circulating nitrogen gas from the bottom air inlet of the prilling tower to cool and prill the piperazine. The prilled piperazine powder is temporarily stored in the hopper at the bottom of the prilling tower (T-3501), and the material in the hopper is periodically (about 6 m3 of material) fed into the packaging machine through the bottom plug valve 10 (3501-XV-350106) for bagging. The bottom of the prilling tower 1 (T-3501) is provided with an air hammer and a prilling tower nitrogen blowing pipeline to prevent bridging and clogging and facilitate the discharge of the material from the hopper. The circulating nitrogen gas containing the piperazine powder is discharged from the top air outlet of the prilling tower 1 (T-3501) and enters the bag-type dust collector 3 (D-3501).
[0041] The circulating nitrogen gas containing the piperazine powder is pulse cleaned in the bag-type dust collector 3 (D-3501), and the piperazine powder cleaned from the filter bag of the bag-type dust collector 3 (D-3501) falls to the bottom of the bag-type dust collector 3 (D-3501) and then passes through the first manual plug valve 20, the rotary valve 21 (X-3501), the second manual plug valve 22, and the discharge pipeline 19 under the bottom plug valve 10 of the prilling tower, and the bottom of the bag-type dust collector 3 is provided with a bag-type dust collector nitrogen blowing pipeline to prevent the powder from accumulating on the wall surface; the tail gas after filtration and purification continues to enter the high-efficiency filter 4 (FI-3501A / B) for dust removal and purification, and the high-efficiency filter 4 is one open and one standby to facilitate replacement of the filter element.
[0042] The circulating nitrogen gas after purification in the high-efficiency filter 4 (FI-3501A / B) is discharged through the nitrogen gas fan 5 (C-3501) and then discharged to the fin cooler 6 (E-3501) through the nitrogen circulation pipeline main pipeline (fourth nitrogen circulation pipeline 2.4); a small part is discharged to the outside of the area through the nitrogen discharge pipeline 23 from the nitrogen circulation pipeline main pipeline (fourth nitrogen circulation pipeline 2.4) through the pressure control valve 25 (3501-PV350102); fresh nitrogen (0.4 MPaG) from the area enters the nitrogen circulation pipeline main pipeline through the nitrogen supplement pipeline 24 and the oxygen content control valve 26 (3501-AV-350101) and is mixed with the circulating nitrogen gas before entering the fin cooler 6.
[0043] The cooler (E-3501) adopts fin cooler 6, the circulating nitrogen (about 48 DEG C) to be cooled goes shell side, and the tube side respectively passes into cooling water (water inlet 31 DEG C) and refrigerant water (water inlet 6 DEG C), and is cooled after circulating nitrogen enters the prilling tower 1 (T-3501) air inlet and is cooled with piperazine liquid cooling prilling.Heat-exchanged cooling water and refrigerant water return to respective pipe network systems respectively.
[0044] It should be noted that the parts not described in detail in the utility model are prior art.
[0045] The terms "first", "second", "third", etc. are used only for the purpose of description and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0046] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0047] The above enumeration is only the best embodiment of the utility model. Obviously, the utility model is not limited to the above embodiments, and there can be many variations. All the variations that ordinary skilled in the art can directly derive or think of from the content disclosed in the utility model should be considered as the protection scope of the utility model.
Claims
1. A granulation system for piperazine products, characterized by: The granulation tower and the nitrogen circulation unit are connected by the feeding pump and the feeding pipeline, the piperazine slurry is connected to the feeding port at the top of the granulation tower, the piperazine slurry is sprayed to form fine droplets and falls by the spray gun at the feeding port, the circulating nitrogen of the nitrogen circulation unit enters from the air inlet at the bottom of the granulation tower, and the circulating nitrogen is in countercurrent contact with the fine droplets of the piperazine slurry to cool and granulate, the circulating nitrogen is discharged from the air outlet at the top of the granulation tower, and then enters the air inlet at the bottom of the granulation tower through the nitrogen circulation pipeline connected with the nitrogen purification unit, the nitrogen fan and the cooling unit in sequence.
2. The prilling system for a piperazine product according to claim 1, characterized in that: The bottom of the granulation tower is provided with a conical hopper for buffering and placing the piperazine particles, and the outlet of the hopper is provided with a bottom plug valve, and the piperazine particles in the hopper are periodically introduced into the packaging machine through the bottom plug valve.
3. The prilling system for a piperazine product according to claim 1, characterized in that: The spray gun is connected to the feeding pipeline through a detachable short circuit, and the top interface of the spray gun is connected with a saturated steam inlet pipeline and a steam condensate outlet pipeline, and the spray gun is connected with the saturated steam inlet pipeline and the steam condensate outlet pipeline through a hose respectively.
4. The prilling system for a piperazine product according to claim 1, characterized in that: A control valve group is arranged on the feeding pipeline, a nitrogen pressure line is connected to the feeding pipeline through a three-way electromagnetic valve, and the three-way electromagnetic valve is arranged downstream of the control valve group; a return branch line is connected to the feeding pipeline, and the return branch line is connected to the piperazine slurry container upstream; the feeding pipeline, the nitrogen pressure line, the return branch line and the spray gun are all provided with a steam heating pipeline.
5. The granulating system of a piperazine product according to any one of claims 1 to 4, characterized in that: The nitrogen purification unit comprises a bag-type dust collector and a high-efficiency filter arranged in sequence, the piperazine powder collected by cleaning the filter bag of the bag-type dust collector falls into the bottom of the bag-type dust collector, and then enters the discharge pipeline below the bottom plug valve of the granulation tower through a first manual plug valve, a rotary valve and a second manual plug valve, and the bottom of the bag-type dust collector is provided with a bag-type dust collector nitrogen blowing pipeline; the filtered and purified circulating nitrogen enters the high-efficiency filter through the top of the bag-type dust collector, and two high-efficiency filters are arranged in parallel.
6. The granulating system of a piperazine product according to any one of claims 1 to 4, characterized in that: The filtered and purified circulating nitrogen of the nitrogen purification unit is discharged through the nitrogen fan and then connected to the cooling unit through the nitrogen circulation pipeline; a nitrogen discharge pipeline and a nitrogen supplement pipeline are connected to the nitrogen circulation pipeline, the inlet of the nitrogen discharge pipeline is connected to the nitrogen circulation pipeline downstream of the nitrogen fan, the outlet of the nitrogen discharge pipeline is led to the outside of the boundary area, fresh nitrogen from the boundary area is connected to the nitrogen circulation pipeline downstream of the nitrogen fan through the nitrogen supplement pipeline, and then mixed with the circulating nitrogen and enters the cooling unit.
7. The prilling system for a piperazine product according to claim 6, characterized in that: A pressure control valve is arranged on the nitrogen discharge pipeline, an oxygen content control valve is arranged on the nitrogen supplement pipeline, the nitrogen pressure in the nitrogen supplement pipeline is 0.4 MPaG, and the outlet pipe section of the nitrogen supplement pipeline is obliquely inserted into the nitrogen circulation pipeline, and the inclination angle is not less than 60°.
8. The prilling system for a piperazine product according to any one of claims 1 to 4, characterized in that: The cooling unit adopts a fin cooler, the circulating nitrogen to be cooled enters the fin cooler, the cooling water and the coolant water flowing in the fin cooler are in countercurrent heat exchange with the circulating nitrogen, and the cooled circulating nitrogen enters the air inlet at the bottom of the granulation tower.
9. The prilling system for a piperazine product according to claim 8, characterized in that: The shell side of the fin cooler is connected with the nitrogen circulation pipeline, the tube side of the fin cooler is connected with the cooling water pipeline network and the coolant water pipeline network; the inlet temperature of the cooling water is 31℃, and the cooling water is returned to the cooling water pipeline network after heat exchange; the inlet temperature of the coolant water is 6℃, and the coolant water is returned to the coolant water pipeline network after heat exchange.