System for preventing pipeline blockage in ammonium sulfate crystallization process

Abstract

The utility model discloses a system for preventing a pipeline from being blocked in an ammonium sulfate crystallization process, and belongs to the technical field of ammonium sulfate devices. According to the technical scheme, the device comprises a crystallizer, a cyclone hydraulic separator, a centrifugal machine and a controller; a discharging port of the crystallizer is connected with a discharging pump through a discharging pump liquid inlet pipeline, an outlet of the discharging pump is connected with a discharging pump liquid outlet pipeline, the other end of the discharging pump liquid outlet pipeline is connected with a cyclone hydraulic separator, and a discharging port of the cyclone hydraulic separator is connected with a centrifugal machine through a pipeline. The discharging pump liquid inlet pipeline and the discharging pump liquid outlet pipeline are each provided with a flushing water branch, each flushing water branch is provided with a control valve, and the control valves are electrically connected with the controller. The crystallizer comprises a crystallizer tank body, a vapor phase outlet is formed in the top of the crystallizer tank body, a washing water inlet and an ammonium sulfate light mother liquor outlet are formed in the side wall of the crystallizer tank body, and a discharging opening is formed in the side face of the bottom of the crystallizer tank body. The cleaning cycle is prolonged, sewage discharge is reduced, and long-period stable operation is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to ammonium sulfate device technical field, more particularly to a system for preventing pipeline blockage during ammonium sulfate crystallization. BACKGROUND

[0002] Ammonium sulfate crystallization device is a key equipment in chemical production, especially in the production system of hydrocyanic acid, the crystallization efficiency of ammonium sulfate directly affects the continuity and economy of the whole process. During the operation of the ammonium sulfate device, with the accumulation of ammonium sulfate particles in the circulating pipeline and heat exchanger, the circulating capacity of the circulating system is reduced, the evaporation capacity of the device is gradually reduced, and the temperature difference between the inlet and outlet of the crystallization heater will also increase. In the traditional process, to prevent complete blockage of the pipeline, manual cleaning of the system is required every 2-3 days: after stopping the ammonium sulfate mother liquor feeding, a large amount of desalted water is injected into the circulating system to dilute the ammonium sulfate solution to an unsaturated state to dissolve the accumulated dirt. This process results in a long single downtime of the device, which seriously affects the operation load of the ammonium sulfate device and greatly reduces the production efficiency. In addition, the high consumption of desalted water during cleaning not only wastes water resources, but also requires additional treatment of wastewater containing ammonium sulfate, increasing the environmental pressure. SUMMARY

[0003] The utility model provides a system for preventing pipeline blockage during ammonium sulfate crystallization, which prolongs the cleaning cycle, reduces sewage discharge and realizes long-term stable operation.

[0004] The technical scheme of the utility model is as follows:

[0005] The system for preventing pipeline blockage during ammonium sulfate crystallization includes a crystallizer, a hydrocyclone, a centrifuge and a controller.

[0006] The discharge outlet of the crystallizer is connected to the discharge pump through a discharge pump inlet pipeline, the outlet of the discharge pump is connected to a discharge pump outlet pipeline, the other end of the discharge pump outlet pipeline is connected to the hydrocyclone, and the discharge outlet of the hydrocyclone is connected to the centrifuge through a pipeline; the discharge pump inlet pipeline and the discharge pump outlet pipeline are both provided with a flushing water branch, the flushing water branch is provided with a control valve, and the control valve is electrically connected to the controller.

[0007] The crystallizer comprises a crystallizer tank body, a vapor phase outlet is arranged at the top of the crystallizer tank body, the crystallizer tank body is provided with a flushing water inlet and an ammonium sulfate light mother liquor outlet, a discharge port is arranged at the bottom side of the crystallizer tank body; the crystallizer is provided with an insertion type differential pressure on-line densimeter, the insertion type differential pressure on-line densimeter is electrically connected with a controller; the crystallizer is provided with a circulating outlet and a circulating inlet, a baffle plate is arranged in the crystallizer, a baffle area is formed between the baffle plate and the adjacent inner wall of the crystallizer, for forced circulation of the ammonium sulfate solution in the crystallizer, the baffle area is discharged, enters the pump through the circulating outlet, and then enters the crystallizer through the circulating inlet; an outer jacket is arranged on the outer wall of the crystallizer, the outer jacket is provided with a steam inlet pipeline and a steam outlet pipeline.

[0008] A stirring mechanism is arranged at the bottom of the crystallizer tank body, the stirring mechanism comprises a stirring motor, a speed reducer is connected with the stirring motor through a shaft coupling, and stirring blades are connected with the output shaft of the speed reducer and penetrate through the crystallizer tank body.

[0009] The hydrocyclone comprises a shell, a material feeding pipe, a light liquid phase discharge pipe and a heavy liquid phase discharge pipe arranged on the shell; the heavy liquid phase discharge pipe of the hydrocyclone is provided with a discharging adjusting valve, the discharging adjusting valve is electrically connected with a controller; and the heavy liquid phase discharge pipe is connected with a centrifugal machine.

[0010] Preferably, the flushing water inlet is provided with an annular distributor.

[0011] Preferably, a defoamer is arranged at the lower end of the vapor phase outlet in the crystallizer tank body.

[0012] Preferably, the hydrocyclone is provided with a cylindrical section and a conical section, and the cylindrical section is provided with an observation window.

[0013] Preferably, the conical section is provided with a steam inlet pipeline, the steam inlet pipeline is connected with a steam distributor, the steam distributor is provided with a plurality of steam outlet branch pipes, and the steam outlet branch pipes are provided with steam nozzles.

[0014] Preferably, one end of the light liquid phase discharge pipe extends into the shell and extends to the conical section, the other end of the light liquid phase discharge pipe extends out of the top of the shell, a light liquid phase discharge valve is further arranged on the extended part of the light liquid phase discharge pipe, and the light liquid phase discharge valve is electrically connected with a controller.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model discloses a insertion type differential pressure on-line densimeter real -time monitoring solution density in the crystallizer, and the controller is combined to automatically open and close flushing water branch control valve, triggers flushing when the crystal concentration is close to the critical value, prevents the crystallization deposition in the pipeline, avoids the artificial intervention delay.

[0017] 2. Double flushing water branch design (liquid inlet and liquid outlet pipeline synchronous flushing) can completely remove residual crystals in the pump body and pipeline, and reduce the probability of blockage.

[0018] 3. The vapor distributor is additionally arranged in the cone section of the hydrocyclone, steam is sprayed through the nozzle to disturb the flow of heavy liquid phase crystals, and accumulation in the cone section is avoided.

[0019] 4. The discharge regulating valve of the heavy liquid phase discharge pipe and the light liquid phase discharge valve are cooperatively adjusted in opening degree according to the instruction of the controller, so that the material after solid-liquid separation is continuously discharged, and the crystallization jam at the valve is reduced.

[0020] 5. The annular distributor at the flushing water inlet ensures uniform dispersion of the reactants and reduces the agglomeration of crystals; and the mist eliminator at the vapor phase outlet prevents the mist from carrying the crystals to block the subsequent equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is a structural schematic view of the utility model.

[0022] Fig. 2 is a structural schematic view of the crystallizer of the utility model.

[0023] Fig. 3 is a structural schematic view of the hydrocyclone of the utility model.

[0024] In the figure, 1, crystallizer; 101, crystallizer tank body; 102, vapor phase outlet; 103, flushing water inlet; 104, ammonium sulfate light mother liquor outlet; 105, discharge port; 106, plug-in differential pressure online densimeter; 107, circulation outlet; 108, circulation inlet; 109, steam inlet pipeline; 110, steam outlet pipeline; 111, stirring motor; 112, stirring blade; 113, annular distributor; 114, mist eliminator; 115, baffle; 2, hydrocyclone; 201, shell; 202, material feeding pipe; 203, light liquid phase discharge pipe; 204, heavy liquid phase discharge pipe; 205, discharge regulating valve; 206, steam distributor; 207, steam outlet branch pipe; 208, light liquid phase discharge valve; 209, steam inlet pipeline; 3, centrifuge; 4, discharge pump liquid inlet pipeline; 5, discharge pump; 6, discharge pump liquid outlet pipeline; 7, flushing water branch; 8, control valve. DETAILED DESCRIPTION

[0025] In order for those skilled in the art to better understand the technical solutions in the utility model, the technical solutions in the utility model embodiments will be clearly and completely described below in combination with the drawings in the utility model embodiments.

[0026] Example 1

[0027] As Figs. 1-3As shown, the embodiment provides a system for preventing pipeline blockage in the ammonium sulfate crystallization process, comprising a crystallizer 1, a hydrocyclone 2, a centrifuge 3 and a controller;

[0028] The discharge outlet of the crystallizer 1 is connected to a discharge pump 5 through a discharge pump inlet pipeline 4, the outlet of the discharge pump 5 is connected to a discharge pump outlet pipeline 6, the other end of the discharge pump outlet pipeline 6 is connected to the hydrocyclone 2, the discharge outlet of the hydrocyclone 2 is connected to the centrifuge 3 through a pipeline; the discharge pump inlet pipeline 4 and the discharge pump outlet pipeline 6 are both provided with a flushing water branch 7, the flushing water branch 7 is provided with a control valve 8, and the control valve 8 is electrically connected to the controller;

[0029] The crystallizer 1 comprises a crystallizer tank body 101, the top of the crystallizer tank body 101 is provided with a vapor phase outlet 102, the crystallizer tank body 101 is provided with a flushing water inlet 103 and an ammonium sulfate light mother liquor outlet 104, the flushing water inlet 103 is provided with an annular distributor 113, the bottom side of the crystallizer tank body 101 is provided with a discharge outlet 105; a defoamer 114 is arranged at the lower end of the vapor phase outlet 102 in the crystallizer tank body 101, the crystallizer 1 is provided with an insertion type differential pressure online densimeter 106, and the insertion type differential pressure online densimeter 106 is electrically connected to the controller; a baffle 115 is arranged in the crystallizer, the baffle 115 and the adjacent inner wall of the crystallizer form a baffle area, which is used for forced circulation of the ammonium sulfate solution in the crystallizer, which comes out of the baffle area, enters the pump through the circulation outlet, and then enters the crystallizer through the circulation inlet; the crystallizer 1 is provided with a circulation outlet 107 and a circulation inlet 108, the outer wall of the crystallizer 1 is provided with an outer jacket, and the outer jacket is provided with a steam inlet pipeline 109 and a steam outlet pipeline 110; the bottom of the crystallizer tank body 101 is provided with a stirring mechanism, the stirring mechanism comprises a stirring motor 111, the stirring motor 111 is connected with a speed reducer through a coupling, and the output shaft of the speed reducer penetrates through the crystallizer tank body 101 and is connected with stirring blades 112;

[0030] The hydrocyclone 2 comprises a shell 201, and a material feeding pipe 202, a light liquid phase discharging pipe 203 and a heavy liquid phase discharging pipe 204 arranged on the shell 201, and the hydrocyclone 2 is provided with a cylindrical section and a conical section, and the cylindrical section is provided with an observation window. One end of the light liquid phase discharging pipe 203 extends into the shell 201 and extends to the conical section, and the other end extends out of the top of the shell 201, and a light liquid phase discharging valve 208 is further arranged on the extending part of the light liquid phase discharging pipe 203, and the light liquid phase discharging valve 208 is electrically connected with a controller; the heavy liquid phase discharging pipe 204 of the hydrocyclone 2 is provided with a discharging adjusting valve 205, and the discharging adjusting valve 205 is electrically connected with the controller; and the heavy liquid phase discharging pipe 204 is connected with a centrifuge 3. The conical section is provided with a steam inlet pipeline 209, the steam inlet pipeline 209 is connected with a steam distributor 206, the steam distributor 206 is provided with a plurality of steam outlet branch pipes 207, and the steam outlet branch pipes 207 are provided with steam nozzles.

[0031] Working process:

[0032] The ammonium sulfate solution is evaporated and concentrated in the crystallizer 1 under the action of the stirring blade 112. The ammonium sulfate solution in the crystallizer is evaporated and concentrated under the heating of the external heat exchanger, to form an ammonium sulfate supersaturated solution and precipitate crystals; the density is monitored in real time by the plug-in differential pressure on-line densimeter 106, and the data is fed back to the controller. When the density value reaches the set threshold value, the controller starts the discharging pump 5, and the crystal slurry is transported to the hydrocyclone 2 through the discharging pump liquid inlet pipeline 4 and the discharging pump liquid outlet pipeline 6. If the density is close to the risk value of blockage, the controller opens the control valve 8 of the flushing water branch 7 to pulse flush the pipeline. The crystal slurry enters the hydrocyclone 2 through the material feeding pipe 202, the heavy liquid phase crystals sink to the heavy liquid phase discharging pipe 204 through the conical section, and the light liquid phase is discharged from the top light liquid phase discharging pipe 203. The steam distributor 206 sprays steam regularly to prevent the crystals in the conical section from adhering; the observation window assists manual confirmation of the separation state, and the opening degree of the discharging adjusting valve 205 and the light liquid phase discharging valve 208 is adjusted through the controller if necessary. The heavy liquid phase crystals enter the centrifuge 3 for dehydration, and the mother liquor returns to the crystallizer for recycling.

[0033] Although the utility model has been described in detail by referring to the drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model without departing from the spirit and essence of the utility model, and these modifications or replacements shall be within the scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the protection scope of the claims.

Claims

1. A system for preventing pipe blockage during the ammonium sulfate crystallization process, characterized in that, It includes a crystallizer (1), a hydrocyclone separator (2), a centrifuge (3), and a controller; The outlet of the crystallizer (1) is connected to the discharge pump (5) through the discharge pump inlet pipe (4), the outlet of the discharge pump (5) is connected to the discharge pump outlet pipe (6), the other end of the discharge pump outlet pipe (6) is connected to the hydrocyclone (2), and the outlet of the hydrocyclone (2) is connected to the centrifuge (3) through a pipe; both the discharge pump inlet pipe (4) and the discharge pump outlet pipe (6) are equipped with a flushing water branch (7), and the flushing water branch (7) is equipped with a control valve (8), which is electrically connected to the controller; The crystallizer (1) includes a crystallizer tank (101), a vapor phase outlet (102) at the top of the crystallizer tank (101), a flushing water inlet (103) and a light ammonium sulfate mother liquor outlet (104) at the top of the crystallizer tank (101), and a discharge port (105) at the bottom side of the crystallizer tank (101); the crystallizer (1) is equipped with an insertion-type differential pressure online density meter (106), which is electrically connected to the controller; a baffle plate (115) is provided inside the crystallizer, and the crystallizer (1) is equipped with a circulation outlet (107) and a circulation inlet (108); an outer jacket is provided on the outer wall of the crystallizer (1), and a steam inlet pipe (109) and a steam outlet pipe (110) are provided on the outer jacket; A stirring mechanism is provided at the bottom of the crystallizer tank (101). The stirring mechanism includes a stirring motor (111). The stirring motor (111) is connected to a reducer through a coupling. The output shaft of the reducer passes through the crystallizer tank (101) and is connected to stirring blades (112). The hydrocyclone separator (2) includes a housing (201), and a material feed pipe (202), a light liquid phase discharge pipe (203), and a heavy liquid phase discharge pipe (204) disposed on the housing (201); the heavy liquid phase discharge pipe (204) of the hydrocyclone separator (2) is provided with a discharge regulating valve (205), which is electrically connected to the controller; the heavy liquid phase discharge pipe (204) is connected to a centrifuge (3).

2. The system for preventing pipeline blockage during the ammonium sulfate crystallization process as described in claim 1, characterized in that, A ring distributor (113) is installed at the flushing water inlet (103).

3. The system for preventing pipeline blockage during the ammonium sulfate crystallization process as described in claim 1, characterized in that, A demister (114) is installed inside the crystallizer tank (101) at the lower end of the vapor phase outlet (102).

4. The system for preventing pipeline blockage during the ammonium sulfate crystallization process as described in claim 1, characterized in that, The hydrocyclone separator (2) is provided with a cylindrical section and a conical section, and the cylindrical section is provided with an observation window.

5. The system for preventing pipeline blockage during the ammonium sulfate crystallization process as described in claim 4, characterized in that, The conical section is provided with a steam inlet pipe (209), which is connected to a steam distributor (206). The steam distributor (206) is provided with several steam outlet branch pipes (207), and each steam outlet branch pipe (207) is provided with a steam nozzle.

6. The system for preventing pipeline blockage during the ammonium sulfate crystallization process as described in claim 5, characterized in that, One end of the light liquid phase discharge pipe (203) extends into the housing (201) and extends to the conical section, while the other end extends out of the top of the housing (201). A light liquid phase discharge valve (208) is also provided on the pipeline of the extended part of the light liquid phase discharge pipe (203), and the light liquid phase discharge valve (208) is electrically connected to the controller.

Images