An alkali solution circulation device and its control method

Abstract

The present invention provides an alkali solution circulation device, which includes an alkali solution tank, an alkali solution filter, an alkali solution circulation pump, a mixing chamber, an alkali solution replenishing pump, an alkali solution circulation heat exchanger, a cooling water tank and a cooling water pump. The input end of the alkali solution filter is connected to the reflux end of the reaction chamber, and the output end of the alkali solution filter is sequentially connected to the input end of the mixing chamber through the alkali solution circulation pump and the alkali solution circulation heat exchanger. The output end of the mixing chamber is connected to the alkali solution input end of the reaction chamber. The input end of the mixing chamber is also connected to the alkali solution tank for alkali solution replenishment through a replenishing pump; the present invention also provides a control method for the alkali solution circulation device. By setting a circulation pump to drive the circulation of the alkali solution, the alkali solution in the reaction chamber can be fully mixed. Coupled with a heat exchanger, the alkali solution entering the circulation device is cooled to ensure the temperature balance in the reaction chamber. At the same time, by setting an alkali solution tank to supplement the loss of the alkali solution in the reaction, the reaction can be ensured to proceed stably all the time.

Description

Technical Field

[0001] The present invention relates to the field of circulation devices, and more particularly, to an alkali solution circulation device and a control method thereof. Background Art

[0002] Alkali solution participates in a reaction in a reaction chamber, is consumed, and generates heat. In order to ensure the continuous and orderly progress of the reaction, it is necessary to continuously supplement the alkali solution. At the same time, due to the structural relationship of the reaction chamber, not all of the alkali solution will immediately participate in the reaction. After the concentration of the unreacted alkali solution decreases, the reaction will slow down, resulting in an impact on the subsequent process. Therefore, traditional reaction chambers all use a stirring mechanism to stir the mixed solution in the reaction chamber for full reaction. However, this will result in a large structure of the reaction chamber and reduce the volume of the reaction chamber. At the same time, traditional reaction chambers do not pay attention to the temperature of the mixed solution, resulting in sometimes violent reactions and sometimes slow reactions, further affecting the orderly progress of the subsequent process. For this reason, an alkali solution circulation device is provided to solve one of the above deficiencies. Summary of the Invention

[0003] Based on this, in order to solve the problems existing in the prior art, the present invention provides an alkali solution circulation device and a control method thereof. The specific technical solutions are as follows:

[0004] An alkali solution circulation device includes an alkali solution tank, an alkali solution filter, an alkali solution circulation pump, a mixing chamber, an alkali solution replenishing pump, an alkali solution circulation heat exchanger, a cooling water tank, and a cooling water pump. The input end of the alkali solution filter is connected to the reflux end of the reaction chamber. The output end of the alkali solution filter is sequentially connected to the input end of the mixing chamber through the alkali solution circulation pump and the alkali solution circulation heat exchanger. The output end of the mixing chamber is connected to the alkali solution input end of the reaction chamber. The input end of the mixing chamber is also connected to the alkali solution tank for alkali solution replenishment through a replenishing pump. The alkali solution circulation heat exchanger is also connected to the cooling water tank through a cooling water pump to form a heat exchange loop.

[0005] The above-mentioned alkali solution circulation device drives the alkali solution to circulate and flow by setting a circulation pump, so that the alkali solution in the reaction chamber can be fully mixed. Then, a heat exchanger is used to cool the alkali solution entering the circulation device to ensure that the temperature in the reaction chamber will not be too high. At the same time, by setting an alkali solution tank to supplement the loss of alkali solution during the reaction, the reaction can be kept stable all the time, meeting the use of subsequent processes.

[0006] Further, the lye circulation device further includes a control module. There are n lye tanks in the lye tank. A first temperature sensor and a heating mechanism are respectively and correspondingly connected to the n lye tanks. The n lye tanks are all communicated with the input end of the mixing chamber through electromagnetic valves. A second temperature sensor and a liquid level sensor are also connected to the mixing chamber. A third temperature sensor is further connected in the reaction chamber. The first temperature sensor, the second temperature sensor, the third temperature sensor, the liquid level sensor, and the heating mechanism are all in signal connection with the control module.

[0007] Further, the volumes, upper temperature limits, and lower temperature limits of the n lye tanks vary in gradients.

[0008] Further, the n lye tanks are configured as:

[0009]

[0010] Wherein, V1 is the volume of the first lye tank, V2 is the volume of the second lye tank, and V n is the volume of the nth lye tank; T (1)max is the upper temperature limit of the first lye tank, T (2)max is the upper temperature limit of the second lye tank, T (n)max is the upper temperature limit of the nth lye tank, T max is the upper temperature limit of the reaction chamber; T (1)min is the lower temperature limit of the first lye tank, T (2)min is the lower temperature limit of the second lye tank, T (n)min is the lower temperature limit of the nth lye tank, T min is the lower temperature limit of the reaction chamber.

[0011] Further, the lye tank and the mixing chamber are both of cylindrical structures.

[0012] Further, the heating mechanism is an electromagnetic heating tube, and the heating mechanism is arranged around the lye tank.

[0013] Further, a flowmeter is connected to the output end of each lye tank.

[0014] A control method for controlling the lye circulation device includes the following steps:

[0015] S100. Obtain the upper temperature limit T max and the lower temperature limit T min of the reaction chamber and the temperature T 混 in the mixing chamber;

[0016] S200. When T 混 <(T max +Tmin ) / 2, starting from the smallest lye tank, import it into the mixing chamber in sequence until T 混 ≥ (T max + T min ), then import the lye in the mixing chamber into the reaction chamber;

[0017] When (T max + T min ) / 2 ≤ T 混 ≤ T max , directly import the lye in the mixing chamber into the reaction chamber;

[0018] When T 混 > T max , starting from the largest lye tank, pour it into the mixing chamber in sequence until T 混 ≤ T max , and import the lye in the mixing chamber into the reaction chamber.

[0019] The above control method for controlling the lye circulation device can accurately control the temperature of the lye in the mixing chamber by setting lye tanks with different volumes and controlling the temperature of the lye tanks, ensuring that the temperature of the lye entering the reaction chamber is within the optimal reaction temperature range.

[0020] Furthermore, when the temperature in the reaction chamber is higher than T max and T 混 ≤ T max , directly connect the first lye tank to the mixing chamber and import it into the reaction chamber.

[0021] Furthermore, when the temperature in the reaction chamber is still higher than T max during a continuous preset time, trigger an alarm.

[0022] Compared with the prior art, the beneficial effects of this application are as follows:

[0023] 1. By setting a circulation pump to drive the lye to circulate, the lye in the reaction chamber can be fully mixed. Coupled with a heat exchanger to cool the lye entering the circulation device, the temperature in the reaction chamber can be ensured not to be too high. At the same time, by setting a lye tank to supplement the loss of lye during the reaction, the reaction can be kept stable all the time to meet the use of subsequent processes.

[0024] 2. By setting lye tanks with different volumes and controlling the temperature of the lye tanks, the temperature of the lye in the mixing chamber can be accurately controlled, ensuring that the temperature of the lye entering the reaction chamber is within the optimal reaction temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but the emphasis is on showing the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0026] Figure 1 It is a schematic structural diagram of a lye circulation device in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Lye tank; 2. Lye filter; 3. Lye circulation pump; 4. Mixing chamber; 5. Lye makeup pump; 6. Lye circulation heat exchanger; 7. Cooling water tank; 8. Cooling water pump; 9. Reaction chamber; 10. Lye tank. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation manners described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] The "first" and "second" in the present invention do not represent specific quantities and orders, but are only used for name distinction.

[0033] Such as Figure 1As shown in the figure, a lye circulation device in an embodiment of the present invention includes a lye tank 1, a lye filter 2, a lye replenishment pump 5, a mixing chamber 4, a lye tank 1, a lye circulation heat exchanger 6, a cooling water tank 7, and a cooling water pump 8. The input end of the lye filter 2 is connected to the reflux end of the reaction chamber 9. The output end of the lye filter 2 is sequentially connected to the input end of the mixing chamber 4 through the lye circulation pump 3 and the lye circulation heat exchanger 6. The output end of the mixing chamber 4 is connected to the lye input end of the reaction chamber 9. The input end of the mixing chamber 4 is also connected to the lye tank 1 for lye replenishment through a replenishment pump. The lye circulation heat exchanger 6 is also connected to the cooling water tank 7 through the cooling water pump 8 to form a heat exchange loop.

[0034] The above-mentioned lye circulation device drives the lye to circulate by setting a circulation pump, so that the lye in the reaction chamber 9 can be fully mixed. Then, a heat exchanger is used to cool the lye entering the circulation device to ensure that the temperature in the reaction chamber 9 will not be too high. At the same time, by setting the lye tank 1 to supplement the loss of lye in the reaction, the reaction can be ensured to proceed stably all the time, meeting the requirements of subsequent processes.

[0035] In one embodiment, the lye circulation device further includes a control module. There are n lye tanks 10 in the lye tank 1. A first temperature sensor and a heating mechanism are respectively and correspondingly connected to the n lye tanks 10. The n lye tanks 10 are all connected to the input end of the mixing chamber 4 through electromagnetic valves. A second temperature sensor and a liquid level sensor are also connected to the mixing chamber 4. A third temperature sensor is also connected to the reaction chamber 9. The first temperature sensor, the second temperature sensor, the third temperature sensor, the liquid level sensor, and the heating mechanism are all signal-connected to the control module.

[0036] In one embodiment, the volumes, upper temperature limits, and lower temperature limits of the n lye tanks 10 vary in a gradient manner.

[0037] In one embodiment, the n lye tanks 10 are configured as follows:

[0038]

[0039] Among them, V1 is the volume of the first lye tank 10, V2 is the volume of the second lye tank 10, and V n is the volume of the nth lye tank 10; T (1)max is the upper temperature limit of the first lye tank 10, T (2)max is the upper temperature limit of the second lye tank 10, T (n)max is the upper temperature limit of the nth lye tank 10, T max is the upper temperature limit of the reaction chamber 9; T (1)min is the lower temperature limit of the first lye tank 10, T(2)min is the lower temperature limit of the second lye tank 10, T (n)min is the lower temperature limit of the nth lye tank 10, T min is the lower temperature limit of the reaction chamber 9

[0040] Based on this, the total heat Q that the ith lye tank 10 can provide i is as follows

[0041] Q i = ρ * V i * C * T i , where

[0042] ρ is the density of the lye, V i is the volume of the ith lye tank 10, C is the specific heat capacity of the lye, T i is the temperature of the ith lye tank 10, i = 1, 2,..., n; the density ρ of the lye and the specific heat capacity C of the lye can both be obtained by looking up reference books and through a limited number of experiments, which will not be elaborated here

[0043] Through the above settings, since the volumes of the lye tanks 10 are different, when the heating mechanism has the same structure and the same power, different amounts of heat can be achieved, so that the temperature adjustment range of the lye in the mixing chamber is wider, thus meeting different heating requirements

[0044] In one embodiment, the lye tank 10 and the mixing chamber 4 are both cylindrical structures. With this design, the volume of the lye in the mixing chamber 4 is the base area multiplied by the height detected by the liquid level sensor. When the liquid level value detected in the mixing chamber 4 is lower than the preset liquid level value, the corresponding lye tank 10 is selected for replenishment according to the difference between the current liquid level value and the preset liquid level value, so that quantitative operation can be realized, which is more convenient for automatic operation

[0045] In one embodiment, the heating mechanism is an electromagnetic heating tube, and the heating mechanism is arranged around the lye tank 10

[0046] In one embodiment, flow meters are connected to the output ends of each of the lye tanks 10. Preferably, the flow meters are in signal connection with the control module. When the flow meters detect the passing of flow, the circulation times c i and the average circulation time t i of the ith lye tank 10 are recorded, and based on this, the pipeline maintenance index A i of the ith lye tank 10 is obtained

[0047]

[0048] where c i ’is the theoretical circulation times of the ith alkali solution tank 10, t i ’ is the theoretical circulation time of the i-th alkali liquid tank 10, X and Y are weight coefficients, and X+Y=1. In this embodiment, X=0.4, Y=0.6, but X and Y can be adjusted and set according to actual conditions. i ’ and t i ’ All can be obtained through a limited number of experiments;

[0049] When A i When it is greater than a preset pipeline maintenance value, the control module issues an alarm, and the pipeline connected to the i-th alkali liquid tank 10 needs maintenance.

[0050] A control method for controlling the alkali solution circulation device comprises the following steps:

[0051] S100, obtaining the upper temperature limit T of the reaction chamber 9 max And the lower limit temperature T min and the temperature T in the mixing chamber 4 混 ;

[0052] S200, when T 混 <(T max +T min ) / 2, the alkali solution is introduced into the mixing chamber 4 in sequence starting from the smallest alkali solution tank 10 until T 混 ≥(T max +T min ) / 2, then the alkali solution in the mixing chamber 4 is introduced into the reaction chamber;

[0053] When (T max +T min ) / 2≤T 混 ≤T max When the alkali solution in the mixing chamber 4 is directly introduced into the reaction chamber;

[0054] When T 混 >T max When the alkali solution is poured into the mixing chamber 4 from the largest alkali solution tank 10 until T 混 ≤T max , introduce the alkali solution in the mixing chamber 4 into the reaction chamber.

[0055] The above-mentioned control method for controlling the alkali solution circulation device can accurately control the temperature of the alkali solution in the mixing chamber 4 by setting alkali solution tanks 10 of different volumes and controlling the temperature of the alkali solution tanks 10, thereby ensuring that the temperature of the alkali solution entering the reaction chamber 9 is in the optimal reaction temperature range.

[0056] In one embodiment, when the temperature in the reaction chamber 9 is higher than Tmax and T 混 ≤ T max When this is the case, the first lye tank 10 is directly connected to the mixing chamber 4 and introduced into the reaction chamber 9.

[0057] In one of the embodiments, when the temperature of the reaction chamber 9 is still higher than T within a continuously preset time max an alarm is triggered.

[0058] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0059] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A control method for an alkali liquor circulation device, characterized in that The above-mentioned lye circulation device includes a lye tank, a lye filter, a lye circulation pump, a mixing chamber, a lye replenishment pump, a lye circulation heat exchanger, a cooling water tank and a cooling water pump. The input end of the lye filter is connected to the reflux end of the reaction chamber. The output end of the lye filter is sequentially connected to the input end of the mixing chamber through the lye circulation pump and the lye circulation heat exchanger. The output end of the mixing chamber is connected to the lye input end of the reaction chamber. The input end of the mixing chamber is also connected to the lye tank for lye replenishment through a replenishment pump. The lye circulation heat exchanger is also connected to the cooling water tank through a cooling water pump to form a heat exchange loop. The lye circulation device further includes a control module. There are n lye tanks in the lye tank. A first temperature sensor and a heating mechanism are respectively and correspondingly connected to the n lye tanks. The n lye tanks are all communicated with the input end of the mixing chamber through solenoid valves. A second temperature sensor and a liquid level sensor are also connected to the mixing chamber. A third temperature sensor is also connected in the reaction chamber. The first temperature sensor, the second temperature sensor, the third temperature sensor, the liquid level sensor and the heating mechanism are all connected to the control module in a signal connection manner. The volumes, upper temperature limits and lower temperature limits of the n lye tanks all change in a gradient manner. The n lye tanks are configured as: ， Among them, V1 is the volume of the first lye tank, V2 is the volume of the second lye tank, and V n is the volume of the nth lye tank; T （1）max is the upper temperature limit of the first lye tank, T （2）max is the upper temperature limit of the second lye tank, T （n）max is the upper temperature limit of the nth lye tank, T max is the upper temperature limit of the reaction chamber; T （1）min is the lower temperature limit of the first lye tank, T （2）min is the lower temperature limit of the second lye tank, T （n）min is the lower temperature limit of the nth lye tank, T min is the lower temperature limit of the reaction chamber; The control method of the above-mentioned lye circulation device includes the following steps: S100. Obtain the upper temperature limit T of the reaction chamber max and the lower temperature limit T min and the temperature T in the mixing chamber 混 ; S200. When T 混 < (T max + T min ) / 2, introduce the liquid from the smallest lye tank into the mixing chamber in sequence until T 混 ≥ (T max + T min ) / 2, then introduce the lye in the mixing chamber into the reaction chamber; When (T max + T min ) / 2 ≤ T 混 ≤ T max then the lye in the mixing chamber is directly introduced into the reaction chamber; When T 混 > T max When the time comes, pour the lye from the largest lye tank into the mixing chamber in sequence until T 混 ≤ T max At this time, pour the lye in the mixing chamber into the reaction chamber; When the temperature in the reaction chamber is higher than T max and T 混 ≤ T max , directly connect the first lye tank to the mixing chamber and introduce it into the reaction chamber.

2. The control method of an alkali solution circulation device according to claim 1, characterized in that, Both the lye tank and the mixing chamber are of a cylindrical structure.

3. The control method of a lye circulation device according to claim 2, characterized in that, The heating mechanism is an electromagnetic heating tube, and the heating mechanism is arranged around the lye tank.

4. The control method of a lye circulation device according to claim 3, characterized in that Flow meters are connected to the output ends of the respective lye tanks.

5. The control method of a lye circulation device according to claim 4, characterized in that, When the temperature in the reaction chamber is higher than T max and T 混 ≤T max , directly connect the first lye tank to the mixing chamber and introduce it into the reaction chamber.

6. The control method of a lye circulation device according to claim 5, characterized in that, If the temperature of the reaction chamber remains higher than T for a continuous preset time max an alarm is triggered.

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