Low-temperature evaporation reaction kettle

Abstract

The utility model discloses a low-temperature evaporation reaction kettle, which relates to the field of low-temperature evaporation reactors and comprises a jacketed tank, a reaction kettle body and a reaction kettle body. The heat supply system is connected with a jacket layer of the jacket tank, and the jacket layer covers a tank body of the jacket tank; the feeding system is communicated with the interior of the jacket tank and comprises an annular feeding pipe and a plurality of feeding branch pipes, the annular feeding pipe is arranged at the bottom of the tank body in a sleeving manner, the middle parts of the feeding branch pipes are arranged in the jacket layer in a penetrating manner, feeding holes of the feeding branch pipes are connected with the annular feeding pipe, and discharging holes of the feeding branch pipes extend into the tank body; the control system is in communication connection with the stirring system, the heat supply system and the feeding system; according to the reaction kettle, the jacket layer of the jacket tank is connected with the heat supply system, and when feed liquid is conveyed into the tank body through the feed branch pipe, heat can be supplied to the feed branch pipe through the jacket layer, so that not only is the heat exchange area increased, but also the problem of low heat exchange efficiency can be solved.

Description

Technical Field

[0001] The utility model belongs to the field of low-temperature evaporation reactors, and more specifically, relates to a low-temperature evaporation reactor. Background Art

[0002] In 1970, the United States first proposed the concept of zero wastewater discharge. The so-called zero wastewater discharge means that after industrial water is reused, the salt and pollutants in the wastewater are all concentrated into wastewater for recycling and reuse, and finally no waste liquid is discharged. As my country pays more attention to environmental protection, in 2005, my country promulgated the "Outline of China's Water Conservation Technology Policy" and clearly pointed out the development of external wastewater reuse and "zero discharge" technology. Subsequently, some large petrochemical and coal chemical industries began to promote zero wastewater discharge. So far, some other industries such as landfill leachate and pharmaceutical wastewater have also begun to promote the implementation of zero wastewater discharge.

[0003] In order to achieve zero discharge of wastewater, wastewater often needs to undergo pretreatment, biochemical treatment, deep treatment, concentration treatment and salt separation and solidification treatment, among which concentration treatment is the most important link in zero discharge treatment of wastewater. After the wastewater is concentrated by a series of membranes, the concentration multiple of the wastewater will not be very high due to the influence of membrane scaling, osmotic pressure and treatment cost. The concentrated liquid produced by the membrane equipment needs to be further concentrated by the evaporation equipment to meet the requirements of salt separation or solidification. The current mainstream evaporators include multiple-effect evaporators (MED), mechanical steam forced recompression evaporators (MVR), low-temperature evaporators, etc. Although multiple-effect evaporators and MVR evaporators are relatively mature evaporators, their processing costs can reach 40-70 yuan / ton, and energy consumption is still the main factor restricting their application. Low-temperature evaporation technology uses the fact that the boiling point of water decreases with the decrease of pressure, thereby achieving evaporation under low temperature conditions. Low-temperature evaporation has low requirements for heat sources and can use waste heat such as flue gas low-temperature steam to achieve heat exchange. The energy consumption required to create a negative pressure environment is nearly 30% lower than the energy consumption of the MVR evaporator compressor. Therefore, its cost per ton of water treatment is lower and the technology is more easily accepted by enterprises.

[0004] Low-temperature evaporation reactors currently still have disadvantages such as low heat exchange efficiency, easy foaming under negative pressure conditions, easy scaling inside the equipment, and easy blockage of discharge. Utility Model Content

[0005] The purpose of the utility model is to provide a low-temperature evaporation reactor in view of the deficiencies in the prior art. The reactor connects the jacket layer of the jacket tank with a heating system. When the feed liquid is transported into the tank body through a feed branch pipe, the feed branch pipe can be heated through the jacket layer, which not only increases the heat exchange area but also solves the problem of low heat exchange efficiency.

[0006] In order to achieve the above object, the utility model provides a low-temperature evaporation reactor, comprising:

[0007] Jacketed tank with a stirring system inside;

[0008] A heating system connected to the jacket layer of the jacketed tank, wherein the jacket layer covers the tank body of the jacketed tank;

[0009] A feeding system is connected to the interior of the jacketed tank, the feeding system comprises an annular feeding pipe and a plurality of feeding branches, the annular feeding pipe is sleeved at the bottom of the tank body, the middle portion of the feeding branch is penetrated and arranged in the jacket layer, the feeding port of the feeding branch is connected to the annular feeding pipe, and the feeding port of the feeding branch extends to the interior of the tank body;

[0010] A control system is communicatively connected with the stirring system, the heating system and the feeding system.

[0011] Optionally, the jacketed tank further comprises an end cover, the end cover is connected to the tank body by bolts, the stirring system is arranged through the end cover, and the inner lining material of the tank body is enamel.

[0012] Optionally, the stirring system includes a stirring motor and a stirring paddle arranged at the upper end of the end cover, the stirring paddle passes through the upper part of the tank body, the stirring motor is connected to the stirring paddle through a flange, and the stirring paddle is composed of an anchor frame stirring paddle and a spiral ribbon stirring paddle from top to bottom.

[0013] Optionally, the feed port of the feed branch pipe is connected to the discharge port of the annular feed pipe, and the discharge port of the feed branch pipe is connected to the feed port arranged inside the tank body.

[0014] Optionally, the feed branch pipes are evenly arranged along the outer circumference of the jacketed tank, and branch pipe valves are respectively provided on the feed branch pipes.

[0015] Optionally, the feed port of the annular feed pipe is connected to a feed pipeline, a feed flow meter and a feed electric valve are provided on the feed pipeline, and the defoaming agent pipeline is connected to the feed pipeline via a plunger valve.

[0016] Optionally, the heating system comprises a heating pipeline connected to the jacket layer, and the heating pipeline is provided with a heating thermometer, a heating flowmeter, a heating electric valve and a heating pressure sensor.

[0017] Optionally, a steam trap is provided at the bottom of the jacket layer.

[0018] Optionally, a secondary steam pipeline, a radar level gauge and a sight glass are provided on the end cover, and a pressure sensor is provided on the secondary steam pipeline.

[0019] Optionally, a discharge port and a differential pressure level gauge are provided at the bottom of the jacketed tank, and the discharge port is connected to a discharge valve and a discharge pump.

[0020] The utility model provides a low-temperature evaporation reaction kettle, which has the following beneficial effects:

[0021] 1. The low-temperature evaporation reactor is provided with an annular feed pipe on the outer periphery of the jacketed tank, and the feed liquid is sent into the jacketed tank through the feed branch pipe. Each branch pipe valve can control a feed branch pipe separately. When a problem occurs in a feed branch pipe, it is only necessary to cut off the corresponding feed valve separately, which will not affect the work of other feed branches, and can realize online repair of the feed system;

[0022] 2. The low-temperature evaporation reactor is provided with a radar level gauge and a differential pressure level gauge at the end cover and the bottom of the jacket tank, respectively. The foam thickness in the jacket tank is calculated by monitoring the two liquid level differences. A certain amount of defoaming agent is added to solve the problem of foam escape affecting secondary steam. The amount of defoaming agent added can be accurately controlled to avoid excessive defoaming agent addition and reduce the cost of the agent.

[0023] 3. The jacketed tank of the low-temperature evaporation reactor has a layer of enamel material as the inner lining on the stainless steel surface. The reactor is an enamel reactor with a smooth enamel surface and a small friction coefficient, which can effectively solve the problem of scaling of the liquid on the wall of the tank;

[0024] 4. The low-temperature evaporation reactor is equipped with an anchor frame stirring paddle and a screw belt stirring paddle in the jacketed tank. The rotation of the anchor frame stirring paddle accelerates the stirring speed of the liquid in the tank, realizes the rapid contact between the liquid and the inner wall of the reactor, prevents the liquid from precipitating and scaling on the wall, and the rotation of the screw belt stirring paddle makes the bottom liquid receive an upward lifting force, avoiding the problem of precipitation and sedimentation of the liquid at the bottom of the tank.

[0025] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0027] Figure 1 The schematic diagram shows the structure of a low-temperature evaporation reactor according to an embodiment of the utility model.

[0028] Figure 2 A schematic diagram showing the connection between an annular feed pipe and a feed branch pipe according to an embodiment of the utility model is shown.

[0029] Figure 3 The figure shows a schematic structural diagram of both ends of a feed branch pipe according to an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. Jacketed tank; 2. Jacket layer; 3. Annular feed pipe; 4. Feed branch pipe; 5. End cover; 6. Stirring motor; 7. Anchor frame stirring paddle; 8. Ribbon stirring paddle; 9. First flange; 10. Second flange; 11. Branch valve; 12. Feed flow meter; 13. Feed electric valve; 14. Defoamer pipeline; 15. Heating pipeline; 16. Heating thermometer; 17. Heating flow meter; 18. Heating electric valve; 19. Steam trap; 20. Secondary steam pipeline; 21. Radar level gauge; 22. Sight glass; 23. Pressure sensor; 24. Discharge pipe; 25. Pressure differential level gauge; 26. Discharge valve; 27. Discharge pump; 28. Control system. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0033] The utility model provides a low-temperature evaporation reaction kettle, comprising:

[0034] Jacketed tank with a stirring system inside;

[0035] A heating system is connected to a jacket layer of the jacketed tank, and the jacket layer covers a tank body of the jacketed tank;

[0036] A feeding system is connected to the interior of the jacketed tank, and the feeding system includes an annular feeding pipe and a plurality of feeding branches. The annular feeding pipe is sleeved at the bottom of the tank body, and the middle of the feeding branch is penetrated and arranged in the jacket layer. The feeding port of the feeding branch is connected to the annular feeding pipe, and the discharge port of the feeding branch extends to the interior of the tank body.

[0037] The control system is communicatively connected with the stirring system, the heating system and the feeding system.

[0038] Specifically, the reactor includes a jacketed tank, a heating system and a feeding system. The heat of the heating system is transferred to the jacket layer through the control system. When the feed liquid in the feeding system is fed into the jacketed tank through the feeding branch pipe, each feeding branch pipe is penetrated in the jacket layer, so that the heat of the heating system can heat the feed liquid and improve the heat exchange efficiency.

[0039] Optionally, the jacketed tank further comprises an end cover, which is connected to the tank body by bolts, the stirring system is arranged on the end cover, and the inner material of the tank body is enamel.

[0040] Specifically, the reactor is an enameled reactor, in which a jacketed tank is arranged, the jacketed tank includes an end cover, a tank body and a tank body bottom, the tank body is a cylindrical structure with an equal cross section, the end cover is a hemispherical cover structure arranged on the upper part of the tank body, the tank body bottom is a hemispherical cover structure arranged on the lower part of the tank body, the end cover and the tank body are bolted together, so when cleaning the inside of the tank body, the end cover can be opened for easy cleaning; the tank body and the tank body bottom are an integrated structure, which improves the overall sealing of the jacketed tank. In addition, the inside of the tank body is made of a steel lining facade coated with multiple layers of enamel glaze to form an enamel lining, and the enamel surface can solve the problem of the liquid scaling on the wall in the tank.

[0041] Optionally, the stirring system includes a stirring motor and a stirring paddle arranged at the upper end of the end cover, the stirring paddle runs through the upper part of the tank body, the stirring motor is connected to the stirring paddle through a flange, and the stirring paddle is composed of an anchor frame stirring paddle and a spiral ribbon stirring paddle from top to bottom.

[0042] Specifically, the stirring motor is fixed at the upper end of the end cover, and the transmission shaft of the stirring motor passes through the center of the end cover and extends to the inside of the tank body. Anchor frame stirring paddles and screw ribbon stirring paddles are arranged on the transmission shaft from top to bottom, and the stirring shaft is 200mm away from the bottom of the tank body; driven by the stirring motor, the upper anchor frame stirring paddle can accelerate the stirring speed of the material liquid in the tank, realize the rapid contact between the material liquid and the inner wall of the jacketed tank, and prevent the material liquid from precipitating and scaling on the wall. The lower screw ribbon stirring paddle stirs the bottom material liquid so that the bottom material liquid is lifted upward, thereby avoiding the problem of precipitation and sedimentation of the bottom material liquid.

[0043] Optionally, the feed port of the feed branch pipe is connected to the discharge port of the annular feed pipe, and the discharge port of the feed branch pipe is connected to the feed port arranged inside the tank body.

[0044] Optionally, the feed branch pipes are evenly arranged along the outer circumference of the jacketed tank, and branch pipe valves are respectively provided on the feed branch pipes.

[0045] Specifically, the annular feed pipe sleeve is arranged on the outer periphery of the bottom of the tank body, all feed branch pipes are evenly arranged along the outer periphery of the tank body, the lower end of the feed branch pipe is connected to the annular feed pipe, the upper end of the feed branch pipe is connected to the feed port of the tank body, and most of the feed branch pipes are arranged in the jacket layer, so that during the transmission of the feed liquid in the feed branch pipe, the feed liquid is subjected to heat transfer from the heating system, and when the feed liquid enters the tank body, it is injected from a higher position to avoid the deposition of the feed liquid at the bottom of the tank and scaling of the pipe wall. In addition, a branch pipe valve is set on each feed branch pipe to control the amount of feed liquid discharged during feeding, and when a feed branch pipe fails, the branch pipe valve can be closed and the feed can be fed through other feed branches, and the feed branch pipe can be repaired without stopping the reactor.

[0046] Optionally, the feed port of the annular feed pipe is connected to a feed pipeline, a feed flow meter and a feed electric valve are provided on the feed pipeline, and the defoaming agent pipeline is connected to the feed pipeline through a plunger valve.

[0047] Specifically, the outer end of the annular feed pipe is connected to the feed pipeline, and the state of the input liquid is observed by the feed flow meter. When the foam thickness in the tank reaches the set value, the plunger pump can be turned on to inject defoaming agent into the tank through the defoaming agent pipeline to solve the problem of foam escape affecting secondary steam.

[0048] Optionally, the heating system includes a heating pipeline connected to the jacket layer, and the heating pipeline is provided with a heating thermometer, a heating flowmeter, a heating electric valve and a heating pressure sensor.

[0049] Optionally, a steam trap is provided at the bottom of the jacket layer.

[0050] Specifically, the heating system delivers steam to the jacket layer through the heating pipeline, and monitors the input steam through the thermometer, flow meter and pressure sensor, so that the heating system preheats the liquid to the set temperature, and then starts the stirring system to stir the liquid. After the steam in the jacket layer exchanges heat with the feed branch pipe, condensed water is formed in the jacket layer, which accumulates at the bottom of the jacket layer and is discharged through the steam trap.

[0051] Optionally, a secondary steam pipeline, a radar level gauge and a sight glass are provided on the end cover, and a pressure sensor is provided on the secondary steam pipeline.

[0052] Specifically, the secondary steam pipeline is opened on the end cover. When the reactor needs to be started, the steam in the tank body is evacuated through the secondary steam pipeline, and the pressure value in the tank body is monitored by the pressure sensor; when the feed liquid is transported into the tank body through the feeding system, the radar level gauge is used to monitor the liquid level position of the feed liquid. When foam is observed in the tank body through the sight glass, the height of the foam can be monitored by the radar level gauge, and the actual height of the feed liquid is monitored by the differential pressure level gauge. The difference between the two is the height of the foam in the tank body. When the foam height reaches the set threshold, the defoaming agent pipeline can be started by the control unit for defoaming.

[0053] Optionally, a discharge pipe and a differential pressure level gauge are provided at the bottom of the jacketed tank, and a discharge valve and a discharge pump are provided on the discharge pipe.

[0054] Specifically, when the material liquid in the tank is concentrated to a certain multiple, the feeding and stirring can be stopped, and the discharge valve and the discharge pump are opened in sequence to discharge the reactor.

[0055] Example

[0056] like Figures 1 to 3As shown, the utility model provides a low-temperature evaporation reaction kettle, comprising:

[0057] A jacketed tank 1 is provided with a stirring system inside;

[0058] A heating system is connected to the jacket layer 2 of the jacket tank 1, and the jacket layer 2 covers the tank body of the jacket tank 1;

[0059] A feeding system is connected to the interior of the jacketed tank 1, and includes an annular feeding pipe 3 and a plurality of feeding branch pipes 4. The annular feeding pipe 3 is sleeved on the bottom of the tank body, and the middle of the feeding branch pipe 4 is penetrated and arranged in the jacket layer 2. The feeding port of the feeding branch pipe 4 is connected to the annular feeding pipe 3, and the discharge port of the feeding branch pipe 4 extends to the interior of the tank body;

[0060] The control system 28 is communicatively connected with the stirring system, the heating system and the feeding system.

[0061] In this embodiment, the jacketed tank further comprises an end cover 5, which is connected to the tank body by bolts, and the stirring system is arranged on the end cover 5, and the inner material of the tank body is enamel.

[0062] In this embodiment, the stirring system includes a stirring motor 6 arranged at the upper end of the end cover, the transmission shaft of the stirring motor 6 extends to the interior of the jacketed tank 1, and the transmission shaft of the stirring motor 6 is provided with an anchor frame stirring paddle 7 and a screw ribbon stirring paddle 8.

[0063] In this embodiment, the feed port of the feed branch pipe 4 is connected to the discharge port of the annular feed pipe 3 via the first flange 9 , and the discharge port of the feed branch pipe 4 is connected to the feed port disposed inside the tank body via the second flange 10 .

[0064] In this embodiment, the feed branch pipes 4 are evenly arranged along the outer circumference of the jacketed tank, and the feed branch pipes 4 are respectively provided with branch pipe valves 11 .

[0065] In this embodiment, the outer end of the annular feed pipe 3 is connected to the feed pipeline, on which a feed flowmeter 12 and a feed electric valve 13 are provided. The feed pipeline is also connected to a defoaming agent pipeline 14, and the defoaming agent pipeline 14 is connected to the feed pipeline through a plunger valve.

[0066] In this embodiment, the heating system includes a heating pipeline 15 connected to the jacket layer, and the heating pipeline 15 is provided with a heating thermometer 16, a heating flowmeter 17, a heating electric valve 18 and a heating pressure sensor.

[0067] In this embodiment, a steam trap 19 is provided at the bottom of the jacket layer 2 .

[0068] In this embodiment, a secondary steam pipeline 20 , a radar level gauge 21 and a sight glass 22 are provided on the end cover 5 . A pressure sensor 23 is provided on the secondary steam pipeline 20 . The pressure sensor 23 is connected to a control system 28 .

[0069] In this embodiment, a discharge pipe 24 and a differential pressure level gauge 25 are provided at the bottom of the jacketed tank 1 , and a discharge valve 26 and a discharge pump 27 are provided at the discharge port of the discharge pipe 24 .

[0070] In summary, during the operation of the low-temperature evaporation reactor, the jacket tank 1 is first evacuated from the secondary steam pipeline 20 by a vacuum pump, so that the vacuum degree in the jacket tank 1 is about -90 kPa; the heating electric valve 18 on the heating system is opened, and the saturated steam enters the jacket layer 2 after filtering out the steam condensate through the steam filter, and the jacket tank 1 begins to be preheated; when the temperature in the jacket tank reaches 50 degrees, the stirring system is turned on, and the feed electric valve 13 on the feed pipeline is opened. Affected by the negative pressure in the tank body, the feed liquid is fed through the annular feed pipe 3 and each feed branch pipe 4, and the feed liquid and the saturated steam in the jacket layer 2 are pre-heated in the feed branch pipe 4. After the pre-heat exchange, the feed liquid enters the tank body, and the liquid level of the feed liquid in the jacket tank 1 is monitored by the radar level gauge on the end cover. When the feed liquid reaches a certain liquid level, the feed electric valve 13 on the feed pipeline begins to close.

[0071] The evaporation temperature in the jacket tank 1 is set to 60 degrees. According to the monitoring of the temperature sensor, when the temperature in the jacket tank 1 is lower than 60 degrees, the control system 28 will automatically open the heating electric valve 18 to pass steam into the jacket layer 2 to provide a heat source for evaporation in the reactor; the evaporation state in the jacket tank 1 is observed through the sight glass 22, and the radar level gauge 21 and the differential pressure level gauge 25 monitor the liquid level in the tank at the same time. The radar level gauge 21 monitors the height reached by the foam, and the differential pressure level gauge 25 monitors the actual height of the feed liquid. The difference between the two is the height of the foam in the reactor. The control system 28 calculates the difference to obtain the foam amount, and according to the foam height, starts the frequency of the defoaming agent dosing pump to eliminate the foam in the tank; when the liquid level of the feed liquid is reduced to a certain height after evaporation, the control system 28 will open the feed electric valve 18 to replenish the feed liquid in the reactor for continued evaporation. When the liquid in the tank is concentrated to a certain multiple, the feed is stopped, and the discharge valve 26 and the discharge pump 27 are opened for discharge.

[0072] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A low temperature evaporation reactor, characterized in that: include: Jacketed tank with a stirring system inside; A heating system connected to the jacket layer of the jacketed tank, wherein the jacket layer covers the tank body of the jacketed tank; A feeding system is connected to the interior of the jacketed tank, the feeding system comprises an annular feeding pipe and a plurality of feeding branches, the annular feeding pipe is sleeved at the bottom of the tank body, the middle portion of the feeding branch is penetrated and arranged in the jacket layer, the feeding port of the feeding branch is connected to the annular feeding pipe, and the feeding port of the feeding branch extends to the interior of the tank body; A control system is communicatively connected with the stirring system, the heating system and the feeding system.

2. The low-temperature evaporation reactor according to claim 1, characterized in that: The jacketed tank further comprises an end cover, which is connected to the tank body by bolts, the stirring system is arranged through the end cover, and the inner lining material of the tank body is enamel.

3. The low-temperature evaporation reactor according to claim 2, characterized in that: The stirring system includes a stirring motor and a stirring paddle arranged at the upper end of the end cover, the stirring paddle passes through the upper part of the tank body, the stirring motor is connected to the stirring paddle through a flange, and the stirring paddle is composed of an anchor frame stirring paddle and a spiral ribbon stirring paddle from top to bottom.

4. The low-temperature evaporation reactor according to claim 1, characterized in that: The feed port of the feed branch pipe is connected to the discharge port of the annular feed pipe, and the discharge port of the feed branch pipe is connected to the feed port arranged inside the tank body.

5. The low-temperature evaporation reactor according to claim 4, characterized in that: The feed branch pipes are evenly arranged along the outer circumference of the jacketed tank, and branch pipe valves are respectively arranged on the feed branch pipes.

6. The low-temperature evaporation reactor according to claim 4, characterized in that: The feed port of the annular feed pipe is connected to a feed pipeline, a feed flow meter and a feed electric valve are arranged on the feed pipeline, and a defoaming agent pipeline is connected to the feed pipeline through a plunger valve.

7. The low-temperature evaporation reactor according to claim 1, characterized in that: The heating system comprises a heating pipeline connected to the jacket layer, and a heating thermometer, a heating flowmeter, a heating electric valve and a heating pressure sensor are arranged on the heating pipeline.

8. The low-temperature evaporation reactor according to claim 1, characterized in that: A steam trap is arranged at the bottom of the jacket layer.

9. The low-temperature evaporation reactor according to claim 2, characterized in that: The end cover is provided with a secondary steam pipeline, a radar level gauge and a sight glass, and the secondary steam pipeline is provided with a pressure sensor.

10. The low-temperature evaporation reactor according to claim 9, characterized in that: A discharge port and a differential pressure level gauge are provided at the bottom of the jacketed tank, and the discharge port is connected to a discharge valve and a discharge pump.

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