Zero-emission evaporation mother liquor automatic constant temperature storage device

Abstract

The application discloses a zero-emission evaporation mother liquor automatic constant-temperature storage device, which comprises an evaporation mother liquor storage tank, a heating device for heating the evaporation mother liquor storage tank, a cooling device for cooling the evaporation mother liquor storage tank and a stirring device for stirring the evaporation mother liquor storage tank, the heating device comprises a circulating liquid buffer tank, the circulating liquid buffer tank is in communication with the jacket of the evaporation mother liquor storage tank through a circulating liquid pump and a circulating liquid heater in sequence and is used for heating evaporation mother liquor in the evaporation mother liquor storage tank, and the condensed water generated by heating the evaporation mother liquor enters the circulating liquid buffer tank through a drain valve and is recycled; when facing different working conditions, especially when normal maintenance or shutdown due to faults occurs, the application can avoid the unstable temperature and concentration of the evaporation mother liquor, avoid the crystallization of the evaporation mother liquor, reduce the loss of the evaporation mother liquor and ensure the normal production operation.

Description

Technical Field

[0001] This invention relates to the field of evaporation mother liquor storage equipment, and more particularly to zero-discharge evaporation mother liquor automatic constant temperature storage equipment. Background Technology

[0002] The zero-emission evaporation mother liquor comes from the evaporation device in the zero-emission system. When the concentration reaches a certain required value, solid-liquid separation needs to be completed through thickening, cooling, crystallization, dehydration and other methods.

[0003] During the normal operation of a zero-emission system, the operating conditions of the evaporator are constantly changing due to variations in the composition of the raw liquid, the operating temperature, the insulation effect caused by changes in ambient temperature, and the heat exchange efficiency caused by fouling in the heat transfer equipment. This can lead to instability in the temperature and concentration of the evaporator mother liquor produced from the evaporator, which can adversely affect subsequent solid-liquid separation. In mild cases, this can reduce production efficiency, and in severe cases, premature crystallization can cause blockage of equipment pipes within the unit.

[0004] Especially when the evaporator needs normal maintenance or is shut down due to malfunction, the mother liquor in the evaporator will crystallize due to factors such as temperature drop or pressure change. At the same time, when the mother liquor is recovered, it cannot be transported to external equipment for proper storage and then returned to the evaporator for processing after maintenance is completed. This fails to effectively protect the evaporator and increases the loss of mother liquor.

[0005] Therefore, how to ensure the stability of parameters such as temperature and concentration of the mother liquor when the zero-emission system is operating under unstable conditions, so as to reduce the crystallization and loss of the mother liquor, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of the above-mentioned deficiencies of the prior art, the technical objective of the present invention is to provide an automatic constant temperature storage device for zero-emission evaporation mother liquor, which can ensure the stability of parameters such as temperature and concentration of evaporation mother liquor when the zero-emission system is unstable, so as to reduce the crystallization and loss of evaporation mother liquor.

[0007] To achieve the above technical objectives, the present invention provides an automatic constant-temperature storage device for zero-emission evaporation mother liquor, comprising an evaporation mother liquor storage tank, a heating device for heating the evaporation mother liquor storage tank, a cooling device for cooling the evaporation mother liquor storage tank, and a stirring device for stirring the evaporation mother liquor storage tank. The heating device includes a circulating liquid buffer tank, which is connected to the jacket of the evaporation mother liquor storage tank in sequence via a circulating liquid pump and a circulating liquid heater, for heating the evaporation mother liquor in the storage tank; the condensate generated from heating the evaporation mother liquor is recycled into the circulating liquid buffer tank through a drain valve.

[0008] The cooling device includes a mother liquor cooler. The mother liquor storage tank is connected to the mother liquor cooler via a mother liquor discharge pump. The mother liquor cooled by the mother liquor cooler enters the mother liquor storage tank through the mother liquor outlet.

[0009] The stirring device includes a power mechanism installed on the mother liquor storage tank and a stirring mechanism installed inside the mother liquor storage tank.

[0010] The mother liquor storage tank is equipped with an evaporation mother liquor inlet valve, and the mother liquor storage tank is also equipped with a concentration gauge, a temperature gauge and a liquid level gauge.

[0011] Preferably, the jacket is provided with a spiral channel.

[0012] Preferably, the circulating liquid buffer tank is equipped with a level gauge, and the replenishment water inlet pipe of the circulating liquid buffer tank is equipped with a replenishment water inlet valve.

[0013] The circulating liquid heater is equipped with a steam inlet valve on the steam inlet pipe, and the circulating liquid heater is equipped with a temperature gauge on the inlet and outlet pipes of the circulating liquid, respectively. The steam inlet pipe is equipped with a pressure gauge, a temperature gauge and a flow meter.

[0014] Preferably, the cooling water inlet pipe of the mother liquor cooler is equipped with a pressure gauge, a temperature gauge and a flow meter, and the cooling water inlet pipe and cooling water outlet pipe of the mother liquor cooler are equipped with differential pressure controllers.

[0015] Preferably, the power mechanism includes a stirring motor and a reducer, and the stirring mechanism includes a stirring shaft, a frame impeller, and a blade lifting impeller;

[0016] The stirring motor and the reducer are fixedly mounted on the evaporation mother liquor storage tank via a frame. The stirring motor is rotatably connected to the stirring shaft via the reducer. The frame impeller and the blade lifting impeller are respectively mounted on the stirring shaft.

[0017] Preferably, the evaporation mother liquor storage tank is provided with an observation window.

[0018] The beneficial effects of this invention are:

[0019] Due to the above-mentioned structural design, the present invention has the following advantages: when the equipment faces different operating conditions, especially when it is shut down due to normal maintenance or failure, it can avoid unstable conditions such as temperature and concentration of the evaporating mother liquor, prevent crystallization of the evaporating mother liquor, thereby reducing the loss of the evaporating mother liquor and ensuring subsequent normal production operations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] In the diagram: 1 Evaporation mother liquor storage tank, 2 Circulating liquid buffer tank, 3 Circulating liquid pump, 4 Circulating liquid heater, 5 Jacket, 6 Mother liquor discharge pump, 7 Mother liquor cooler, 8 Stirring motor, 9 Reducer, 10 Frame, 11 Stirring shaft, 12 Frame impeller, 13 Paddle lift impeller, 14 Evaporation mother liquor inlet valve, 15 Make-up water inlet valve, 16 Steam inlet valve, 17 Drain valve, 18 Differential pressure controller, 19 Observation window. Detailed Implementation

[0022] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Example

[0023] like Figure 1 As shown, the zero-emission evaporation mother liquor automatic constant temperature storage equipment includes an evaporation mother liquor storage tank 1, a heating device for heating the evaporation mother liquor storage tank 1, a cooling device for cooling the evaporation mother liquor storage tank 1, and a stirring device for stirring the evaporation mother liquor storage tank 1. The heating device includes a circulating liquid buffer tank 2, which is connected to the jacket 5 of the evaporation mother liquor storage tank 1 in sequence through a circulating liquid pump 3 and a circulating liquid heater 4, and is used to heat the evaporation mother liquor in the evaporation mother liquor storage tank 1; the condensate generated by heating the evaporation mother liquor enters the circulating liquid buffer tank 2 for recovery through a drain valve 17.

[0024] The cooling device includes a mother liquor cooler 7. The mother liquor storage tank 1 is connected to the mother liquor cooler 7 through a mother liquor discharge pump 6. The mother liquor cooled by the mother liquor cooler 7 enters the mother liquor storage tank 1 through the mother liquor outlet.

[0025] The stirring device includes a power mechanism installed on the mother liquor storage tank 1 and a stirring mechanism installed inside the mother liquor storage tank 1;

[0026] An evaporation mother liquor storage tank 1 is equipped with an evaporation mother liquor inlet valve 14. The evaporation mother liquor storage tank 1 is also equipped with a concentration gauge, a temperature gauge and a level gauge. The concentration gauge is used to measure the concentration of the evaporation mother liquor in real time; the temperature gauge is used to measure the temperature of the evaporation mother liquor in the evaporation mother liquor storage tank 1 and to control the temperature as required. When the temperature is lower than the required temperature, the heating device is automatically activated, and when the temperature is higher than the required temperature, the cooling device is automatically activated; the level gauge is used to monitor the level of the evaporation mother liquor in real time.

[0027] The main innovation of this invention is that when the temperature of the evaporated mother liquor in the mother liquor storage tank 1 does not meet the requirements, the evaporated mother liquor can be heated or cooled by a heating device or a cooling device until the requirements are met.

[0028] In this embodiment, the level gauge is used to monitor the level of the mother liquor in real time. When the level is high, the mother liquor inlet valve 14 is closed and an alarm is triggered. When the level is low, the mother liquor discharge pump 6 is closed and an alarm is triggered. When the mother liquor discharge pump 6 stops running, the refrigeration unit stops running and cannot be started.

[0029] Furthermore, in order to improve heating efficiency, a spiral channel is provided inside the jacket 5. The spiral channel helps to increase the flow rate of the circulating liquid inside the jacket 5, thereby improving the heat transfer effect.

[0030] A level gauge is installed on the circulating liquid buffer tank 2, and a water supply valve 15 is installed on the water supply pipeline of the circulating liquid buffer tank 2; a steam inlet valve 16 is installed on the steam supply pipeline of the circulating liquid heater 4, and temperature gauges are installed on the inlet and outlet pipelines of the circulating liquid heater 4 to monitor the working effect of the circulating liquid heater 4; a pressure gauge, a temperature gauge and a flow meter are installed on the steam supply pipeline to monitor the steam operating parameters and consumption.

[0031] The circulating liquid buffer tank 2 is equipped with a level gauge to monitor its internal liquid level in real time. At the same time, when the liquid level is low, the water supply valve 15 is controlled to open and automatically replenish water. When the liquid level is very low, the circulating liquid pump 3 shuts down and alarms, and the steam inlet valve 16 is closed at the same time. When the liquid level is high, the water supply valve 15 is closed.

[0032] Pressure gauges, temperature gauges, and flow meters are installed on the cooling water inlet pipe of the mother liquor cooler 7 to monitor the operating parameters of the cooling water. Differential pressure controllers 18 are installed on the cooling water inlet pipe and cooling water outlet pipe of the mother liquor cooler 7 to monitor the operating status of the mother liquor cooler 7.

[0033] More specifically, the power mechanism includes a stirring motor 8 and a reducer 9, and the stirring mechanism includes a stirring shaft 11, a frame impeller 12, and a paddle lift impeller 13. The stirring motor 8 and the reducer 9 are fixedly mounted on the evaporation mother liquor storage tank 1 via a frame 10. The stirring motor 8 is rotatably connected to the stirring shaft 11 via the reducer 9. The frame impeller 12 and the paddle lift impeller 13 are respectively mounted on the stirring shaft 11. The frame impeller 12 is mainly used to prevent the evaporation mother liquor from stagnating near the wall of the evaporation mother liquor storage tank 1, which would cause the temperature to be too high or too low. The paddle lift impeller 13 is mainly used for the circulation of the evaporation mother liquor in the evaporation mother liquor storage tank 1 to prevent stratification, sedimentation, etc.

[0034] In some embodiments, an observation window 19 is provided on the evaporation mother liquor storage tank 1 to facilitate observation of the internal conditions of the storage tank 1.

[0035] Working principle and usage process of this invention:

[0036] When the temperature of the mother liquor in the mother liquor storage tank 1 is lower than the required value, the heating device will automatically operate. The circulating liquid is heated by steam from the evaporation device in the circulating liquid heater 4. The circulating liquid flows through the spiral channel in the jacket 5 of the mother liquor storage tank 1 after passing through the circulating liquid buffer tank 2, the circulating liquid pump 3, and the circulating liquid heater 4, heating the mother liquor. The operation will automatically stop after the temperature of the mother liquor reaches the required value.

[0037] When the temperature of the mother liquor in the mother liquor storage tank 1 is higher than the required value, the cooling device will automatically operate. The circulating mother liquor will be cooled by the refrigerant from the refrigeration unit in the mother liquor cooler 7. The mother liquor will pass from the mother liquor storage tank 1 through the mother liquor discharge pump 6 and the mother liquor cooler 7. The operation will automatically stop after the temperature of the mother liquor reaches the required value.

[0038] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A zero-emission automatic constant-temperature storage device for evaporation mother liquor, comprising an evaporation mother liquor storage tank, a heating device for heating the evaporation mother liquor storage tank, a cooling device for cooling the evaporation mother liquor storage tank, and a stirring device for stirring the evaporation mother liquor storage tank, characterized in that: The heating device includes a circulating liquid buffer tank, which is connected to the jacket of the evaporation mother liquor storage tank via a circulating liquid pump and a circulating liquid heater, and is used to heat the evaporation mother liquor in the evaporation mother liquor storage tank; the condensate generated by heating the evaporation mother liquor enters the circulating liquid buffer tank for recovery through a drain valve; The cooling device includes a mother liquor cooler. The mother liquor storage tank is connected to the mother liquor cooler via a mother liquor discharge pump. The mother liquor cooled by the mother liquor cooler enters the mother liquor storage tank through the mother liquor outlet. The stirring device includes a power mechanism installed on the mother liquor storage tank and a stirring mechanism installed inside the mother liquor storage tank. The mother liquor storage tank is equipped with an evaporation mother liquor inlet valve, and the mother liquor storage tank is also equipped with a concentration gauge, a temperature gauge and a liquid level gauge. The circulating liquid buffer tank is equipped with a level gauge, and the replenishing water inlet pipe of the circulating liquid buffer tank is equipped with a replenishing water inlet valve. The circulating liquid heater is equipped with a steam inlet valve on the steam supply pipe, and the circulating liquid heater is equipped with a temperature gauge on the inlet and outlet pipes of the circulating liquid, respectively. The steam supply pipe is equipped with a pressure gauge, a temperature gauge and a flow meter. The mother liquor cooler is equipped with a pressure gauge, a temperature gauge and a flow meter on the cooling water inlet pipe, and a differential pressure controller is installed on the cooling water inlet pipe and the cooling water outlet pipe of the mother liquor cooler. The power mechanism includes a stirring motor and a speed reducer, and the stirring mechanism includes a stirring shaft, a frame impeller, and a blade lifting impeller. The stirring motor and the reducer are fixedly mounted on the evaporation mother liquor storage tank by a frame. The stirring motor is rotatably connected to the stirring shaft through the reducer. The frame impeller and the blade lifting impeller are respectively mounted on the stirring shaft. When the temperature of the mother liquor in the mother liquor storage tank is lower than the required value, the circulating liquid is heated by steam from the evaporation device in the circulating liquid heater. The circulating liquid flows through the spiral channel in the jacket of the mother liquor storage tank after passing through the circulating liquid buffer tank, the circulating liquid pump, and the circulating liquid heater, heating the mother liquor. The operation automatically stops after the temperature of the mother liquor reaches the required value. When the temperature of the mother liquor in the mother liquor storage tank is higher than the required value, the circulating mother liquor is cooled by refrigerant from the refrigeration unit in the mother liquor cooler. The mother liquor passes from the mother liquor storage tank through the mother liquor discharge pump and the mother liquor cooler. The operation automatically stops after the temperature of the mother liquor reaches the required value.

2. The zero-emission evaporation mother liquor automatic constant temperature storage equipment according to claim 1, characterized in that: The jacket is provided with a spiral channel.

3. The zero-emission evaporation mother liquor automatic constant temperature storage device according to claim 1, characterized in that: The evaporation mother liquor storage tank is equipped with an observation window.

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